Natural gas pipeline sealing safety detection device

Abstract

A natural gas pipeline leakproofness safety detection device of the present invention comprises a detector, and further comprises a sealing tape, a pressing block and a stretching assembly, the sealing tape is used for wrapping a pipeline, the tape surfaces at the two ends of the sealing tape abut against each other, the pressing block is provided with a pressing hole in a penetrating manner, the tape surface at the middle end of the sealing tape is provided with a gas groove, and the two ends of the sealing tape penetrate through the pressing hole at the same time. The stretching assembly is detachably connected to the two ends of the sealing belt at the same time, the pressing block and the stretching assembly are connected with a force application assembly at the same time, the force application assembly is used for driving the pressing block and the stretching assembly to be away from each other, and the detector is installed on the sealing belt and communicated with the air groove. The technical problem that an existing detection device cannot detect the connection sealing performance of pipelines with different pipe diameters can be solved.

Description

Technical Field

[0001] The invention relates to the technical field of sealing detection, and in particular to a natural gas pipeline sealing safety detection device. Background Art

[0002] Natural gas is a flammable and explosive gas. If the pipeline sealing performance is poor and leakage occurs, it will not only cause energy waste, but also may cause serious safety accidents such as fire and explosion. Therefore, sealing detection is a necessary measure to ensure the safe transportation of natural gas.

[0003] A Chinese patent with announcement number CN205879461U discloses a sealed natural gas pipeline interface sealing detection device, including an upper tube body and a lower tube body hinged to one end of the upper tube body, a protrusion is provided at the bottom of one side of the upper tube body, and a lock is hinged at the top of one side of the lower tube body, the upper tube body and the lower tube body are provided with sealing strips at the fitting part, upper sealing rings are provided at both ends of the inner wall of the upper tube body, lower sealing rings are provided at both ends of the inner wall of the lower tube body, a natural gas detector is provided on the top of the upper tube body, and a detection head is provided at the bottom of the natural gas detector that penetrates the tube wall of the upper tube body.

[0004] The above scheme realizes the sealing space relative to the pipeline connection section through the upper tube body, the lower tube body, the upper sealing ring, the lower sealing ring and the sealing strip, but this method must ensure the consistency of the inner diameter formed by the upper and lower sealing rings and the outer diameter of the tube body to be tested, otherwise the sealing effect cannot be met and it is difficult to use for detection operations under different pipe diameter scenarios. Summary of the invention

[0005] In view of this, an object of the present invention is to provide a natural gas pipeline sealing safety detection device to improve the technical problem that the existing detection device cannot detect the sealing of pipeline connections with different diameters.

[0006] The present invention is achieved through the following technical solutions:

[0007] A natural gas pipeline sealing safety detection device includes a detector, a sealing belt, a pressure block and a stretching assembly. The sealing belt is used to cover the pipeline, and its two end belt surfaces abut against each other. The pressure block is provided with a pressure hole through it, and the middle end belt surface of the sealing belt is provided with an air groove, and both ends pass through the pressure hole at the same time. The stretching assembly is detachably connected to both ends of the sealing belt. The pressure block and the stretching assembly are simultaneously connected to a force-applying assembly, and the force-applying assembly is used to drive the pressure block and the stretching assembly away from each other. The detector is installed on the sealing belt and connected to the air groove.

[0008] Furthermore, the pressure block includes a pressure plate and two elastic sealing blocks, one end of which is detachably connected to the two ends of the pressure plate. The two elastic sealing blocks are simultaneously filled in the angle a formed by the two ends of the sealing belt, and are both used to abut against the pipeline at the same time. The pressure hole is opened through the pressure plate.

[0009] Furthermore, the lower sides of the two elastic sealing blocks are provided with lower arc surfaces for abutting against the pipeline, and the two sides in the horizontal direction are provided with side arc surfaces, and the two side arc surfaces are respectively abutted against the belt surfaces at both ends of the sealing belt.

[0010] Furthermore, two mounting holes are provided at the lower opening of the pressure hole; the pressure block also includes two rollers, the two rollers are rotatably connected to the two mounting holes respectively, and the rolling surfaces of the two rollers are in contact with the belt surface of the sealing belt.

[0011] Furthermore, the stretching assembly includes a pull plate and at least one clamping plate fixedly connected to the pull plate, the pull plate is connected to the force-applying assembly, and the clamping plate simultaneously clamps and is detachably connected to both ends of the sealing belt.

[0012] Furthermore, the stretching assembly also includes at least one connecting piece, the number of the connecting pieces is equal to the number of the clamps, and the connecting pieces are detachably connected one by one; both ends of the sealing belt are provided with through holes for the connecting pieces to pass through.

[0013] Furthermore, the force-applying assembly includes at least two linear driving members evenly distributed on the pressing block, the extension direction of each linear driving member is the opening direction of the pressing hole, and each linear driving member is simultaneously connected to the pressing block and the stretching assembly.

[0014] Furthermore, each of the linear drive members includes a sleeve rod and two screw rods, one end of the two screw rods is threadedly connected to the two ends of the sleeve rod, and the other ends are fixedly connected to the pressing block and the stretching assembly.

[0015] Furthermore, each of the sleeve rods is formed with external teeth; the force-applying assembly also includes a toothed ring rotatably connected to the pressing block and / or the stretching assembly, and the toothed ring is simultaneously engaged with each of the sleeve rods.

[0016] Furthermore, the thickness of both ends of the sealing belt gradually increases from the end to the middle.

[0017] The beneficial effects of the present invention are at least:

[0018] The natural gas pipeline sealing safety detection device seals the pipeline connection by arranging a sealing belt with an air groove to form an air chamber during the detection process, and uses a detector to detect the change of air pressure in the air chamber to determine whether there is a leak; at the same time, by arranging a force-applying component, the stretching component and the pressure block can move in opposite directions, so that the pressure block squeezes the sealing belt to ensure the sealing between the sealing belt and the outer wall of the pipeline, that is, by utilizing the change in the length of the sealing belt, pipelines of different diameters can be covered, and under the continuous application of force by the force-applying component, the sealing belt can be ensured to be tightly attached to the outer wall of the pipeline to prevent leakage, thereby improving the technical problem that the existing detection device cannot detect the sealing of pipeline connections with different diameters.

[0019] The natural gas pipeline sealing safety detection device inserts elastic sealing blocks at the angle a formed by the two ends of the sealing belt relative to the pipeline to fill the gap at the angle a formed by the two ends of the sealing belt relative to the pipeline, and during the test, the force applied by the force-applying component is continuously applied to make the elastic sealing block adaptively deform and further fill the angle a, thereby ensuring the sealing of the gas chamber.

[0020] The natural gas pipeline sealing safety detection device is provided with a sealing belt whose thickness gradually increases from the end to the middle, so that when the sealing belt is pulled, the sealing belt undergoes adaptive deformation at the pressure hole and fills the larger amount at the angle a, thereby further improving the sealing performance.

[0021] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and to some extent, will be obvious to those skilled in the art based on the following examination and study, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a usage state structure diagram of the present invention;

[0023] Figure 2 It is a partial cross-sectional view of the present invention;

[0024] Figure 3 For the present invention Figure 2 A partial cross-sectional view of

[0025] Figure 4 For the present invention Figure 3 Schematic diagram of the local structure;

[0026] Figure 5 This is the first partial structural diagram of the present invention, mainly showing the installation structure of the pressing block;

[0027] Figure 6For the present invention Figure 5 A partial enlarged view of

[0028] Figure 7 It is a second partial structural diagram of the present invention, mainly showing the stretching component and the force-applying component;

[0029] Figure 8 For the present invention Figure 7 A partial enlarged view of middle A.

[0030] In the figure: 1. pipeline; 2. detector; 3. sealing belt; 31. air groove; 32. card slot; 33. slot; 34. card block; 4. pressure block; 41. pressure plate; 411. pressure hole; 412. mounting hole; 42. elastic sealing block; 421. lower arc surface; 422. side arc surface; 423. plug block; 43. roller; 5. stretching assembly; 51. pull plate; 52. splint; 53. connector; 6. force assembly; 61. linear drive member; 611. sleeve rod; 612. screw rod; 62. gear ring; 621. ring groove; 63. suspension rod. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0034] In the above description of the present invention, it should be noted that the terms "one side", "the other side", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use, 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", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0035] In addition, the term "same" does not mean that the parts must be absolutely the same, but slight differences are allowed. The term "vertical" only means that the positional relationship between the parts is more vertical than "parallel", and does not mean that the structure must be completely vertical, but can be slightly tilted.

[0036] In the prior art, the sealing test of the pipeline is usually to test the sealing of the pipeline welding connection. Based on this, during the testing process, the end of the pipeline will be sealed by airbags, valves and other equipment to form a sealed channel in the pipeline, and then gas will be blown into the channel (such as the Chinese patent application number CN202110713777.2), and the outside of the welding part will be tested by a detector, or water will be poured at the welding part to show it through bubbles. Among them, the detector can be an airtightness detector, or a barometer connected to the channel.

[0037] See also Figure 1-Figure 6 The present invention provides a technical solution: a natural gas pipeline sealing safety detection device, including a detector 2, a sealing belt 3, a pressure block 4 and a stretching assembly 5, the sealing belt 3 is used to cover the pipeline 1, and its two end belt surfaces abut against each other, the pressure block 4 is provided with a pressure hole 411, the middle end belt surface of the sealing belt 3 is provided with an air groove 31, and both ends pass through the pressure hole 411 at the same time, the stretching assembly 5 is detachably connected to the two ends of the sealing belt 3, the pressure block 4 and the stretching assembly 5 are simultaneously connected to a force-applying assembly 6, and the force-applying assembly 6 is used to drive the pressure block 4 and the stretching assembly 5 to move away from each other, and the detector 2 is installed on the sealing belt 3 and connected to the air groove 31.

[0038] When testing the sealing performance of the ends of the two pipes 1 connected to each other, first wrap the sealing tape 3 around the connecting ends of the two pipes 1, and make the air groove 31 of the sealing tape 3 cover the connecting part of the two pipes 1, the sealing tape 3 forms an air chamber connected to the detector 2 relative to the pipe 1, and at the same time, make the two end surfaces of the sealing tape 3 abut against each other, then the two ends of the sealing tape 3 abutting against each other are simultaneously passed through the pressure hole 411 of the pressing block 4, and the two ends of the sealing tape 3 are simultaneously connected to the stretching component 5, then, the force-applying component 6 is simultaneously connected to the pressing block 4 and the stretching component 5, and finally , by starting the force-applying component 6, the pressing block 4 and the stretching component 5 move away from each other, so that the pressing block 4 moves toward the pipeline 1 relative to the stretching component 5 and presses the pipeline 1, and the two ends of the sealing belt 3 stretch toward the stretching component 5 relative to the pressing block 4 at the same time, so that the sealing belt 3 is closely attached to the outer wall of the pipeline 1 to ensure the sealing of the air chamber. After that, the ends of the two pipelines 1 can be closed, and the pipeline sealing can be tested by passing gas into the pipeline 1. If the value detected by the detector 2 does not change, it proves that there is no air leakage. If the value changes, it proves that there is air leakage. Through the above-mentioned detection method, the sealing belt 3 can cover pipelines 1 of different diameters, and under the continuous application of force by the force-applying component 6, it can ensure that the sealing belt 3 is closely attached to the outer wall of the pipeline 1 to prevent air leakage, thereby improving the technical problem that the existing detection device cannot detect the connection sealing of pipelines 1 with different diameters.

[0039] In this embodiment: Please refer to Figure 5 , Figure 6 A card slot 32 is provided at one end of the sealing belt 3. The card slot 32 runs through the side edge of the end. The card slot 32 and the air slot 31 are located on the same side of the sealing belt 3, and a slot 33 is provided at the groove wall of the card slot 32. A card block 34 adapted to and slidably connected to the card slot 32 is formed at the other end of the sealing belt 3.

[0040] Before the two ends of the sealing belt 3 abutting against each other are simultaneously passed through the pressure hole 411 of the pressure block 4, the clamping block 34 can be inserted from the slot 33 and slid into the clamping groove 32 until the clamping block 34 is completely clamped into the clamping groove 32. By clamping the clamping block 34 into the clamping groove 32 in this way, it can be ensured that the two ends of the sealing belt 3 will not be separated.

[0041] The card slot 32 may be a stepped slot or a dovetail slot. The figure shows a stepped slot. The slot 33 is a "U"-shaped slot.

[0042] The sealing belt 3 can be made of rubber, silicone and other materials. In this embodiment, the width of the sealing belt 3 is equal to the opening length of the pressure hole 411, and the sum of the thicknesses at both ends of the sealing belt 3 is not less than the opening width of the pressure hole 411. When the sum of the thicknesses at both ends of the sealing belt 3 is greater than the opening width of the pressure hole 411, the sealing belt 3 is compressed to pass through the pressure hole 411.

[0043] The detection probe of the detector 2 extends into the gas groove 31 .

[0044] See also Figure 1-Figure 4 In this embodiment: the pressing block 4 includes a pressing plate 41 and two elastic sealing blocks 42, one end of which is detachably connected to the two ends of the pressing plate 41, and the two elastic sealing blocks 42 are both filled in the angle a formed by the two ends of the sealing belt 3, and are both used to abut against the pipeline 1 at the same time, and the pressure hole 411 is opened through the pressing plate 41.

[0045] After the two ends of the sealing belt 3 that are abutting each other are simultaneously passed through the pressure holes 411 of the pressure plate 41, the two ends of the sealing belt 3 form an angle a relative to the pipeline 1. At this time, the two elastic sealing blocks 42 are respectively inserted into the two angles a formed by the two ends of the pressure plate 41 to fill the angle a formed by the two ends of the sealing belt 3 relative to the pipeline 1 to ensure the sealing of the air chamber during detection; and during the test, as the force-applying component 6 continues to apply force, the pressure block 4 continues to squeeze the pressure plate 41, and the pressure plate 41 continues to squeeze the elastic sealing block 42, and the elastic sealing block 42 undergoes adaptive deformation and further fills the angle a, thereby ensuring the sealing of the air chamber.

[0046] The elastic sealing block 42 can be made of materials such as rubber and silicone.

[0047] In this embodiment, the opposite ends of the two elastic sealing blocks 42 are fixedly connected with plug blocks 423. The plug block 423 is "L" shaped, with one end fixedly connected to the elastic sealing block 42 and the other end bent toward the pressure plate 41 and detachably connected to the pressure plate 41.

[0048] As one of the parallel solutions, a plug hole is provided on the side of the pressing plate 41 for inserting the other end of the plug block 423 to achieve plug-in installation. In this way, after the two ends of the sealing belt 3 that abut against each other are simultaneously passed through the pressure hole 411 of the pressing plate 41, a force can be applied to the pressing plate 41 to initially press it toward the pipeline 1, and then the plug block 423 is plugged into the pressing plate 41 until the elastic sealing block 42 is inserted into the angle a.

[0049] As a second parallel solution, the insert block 423 can also be installed by riveting, clamping, etc.

[0050] In this embodiment, the lower sides of the two elastic sealing blocks 42 are provided with lower arc surfaces 421 for abutting the pipeline 1, and the two sides in the horizontal direction are provided with side arc surfaces 422, and the two side arc surfaces 422 abut against the belt surfaces at both ends of the sealing belt 3 respectively.

[0051] When the elastic sealing block 42 is inserted into the two angles a formed by the two ends of the pressure plate 41, the lower arc surface 421 can form a curved surface contact with the outer wall of the pipeline 1. At the same time, the arc surfaces 422 on both sides form arc surface contact with the arc surfaces at the bending parts of the sealing belt 3 to reduce the possibility of air leakage due to tiny pores and ensure the sealing effect.

[0052] See also Figure 1-Figure 4 In this embodiment, two mounting holes 412 are provided at the lower opening of the pressure hole 411; the pressure block 4 further includes two rollers 43, which are rotatably connected to the two mounting holes 412 respectively, and the rolling surfaces of the two rollers are in contact with the belt surface of the sealing belt 3.

[0053] When the end of the sealing belt 3 moves toward the stretching component 5 relative to the pipe 1 under the continuous force applied by the force-applying component 6, the roller 43 rotates under the action of the friction force, so that the sealing belt 3 is pulled smoothly; and when the sealing belt 3 is pressed down by the pressure plate 41, the roller 43 abuts against the belt surface of the sealing belt 3 to form an arc surface contact, which can prevent the sealing belt 3 from being damaged under the action of tension, and can avoid the problem that the elastic sealing block 42 is difficult to seal the angle a due to the sudden change in the bending surface of the sealing belt 3 being too large.

[0054] The roller 43 is a stepped shaft, and the diameters at both ends are smaller than the diameter at the middle end. The roller 43 can be rotatably mounted via a bearing.

[0055] See also Figure 1-Figure 6 In this embodiment: the stretching component 5 includes a pull plate 51 and at least one clamping plate 52 fixedly connected to the pull plate 51, the pull plate 51 is connected to the force-applying component 6, and the clamping plate 52 is simultaneously clamped and detachably connected to the two ends of the sealing belt 3.

[0056] After the two ends of the sealing belt 3 that are abutting each other are simultaneously passed through the pressure hole 411 of the pressure block 4, the two ends of the sealing belt 3 are simultaneously connected to the clamping plate 52 of the stretching component 5. After that, the force-applying component 6 is simultaneously connected to the pressure block 4 and the pulling plate 51 of the stretching component 5, so that the force applied by the force-applying component 6 can apply tension to the end of the sealing belt 3 through the pulling plate 51 and the clamping plate 52, so that a seal is formed between the sealing belt 3 and the pipeline 1.

[0057] The clamping plate 52 is in an inverted "U"-shaped structure, with a closed end fixedly connected to the pull plate 51 and an open end opening downwards to allow both ends of the parallel sealing belts 3 to be inserted simultaneously.

[0058] In this embodiment: the stretching assembly 5 further includes at least one connecting member 53, the number of the connecting members 53 is equal to the number of the clamping plates 52, and the connecting members 53 are detachably connected one by one; both ends of the sealing belt 3 are provided with through holes for the connecting members 53 to pass through.

[0059] After the two ends of the sealing belt 3 that are abutting each other are simultaneously passed through the pressure holes 411 of the pressure block 4, the connecting pieces 53 are simultaneously passed through the through holes at both ends of the sealing belt 3, and the connecting pieces 53 are connected to the corresponding clamping plates 52. After that, the force-applying component 6 is simultaneously connected to the pressure block 4 and the pulling plate 51 of the stretching component 5, and subsequent tightening work can be carried out; by simultaneously connecting the two ends of the sealing belt 3 through the connecting piece 53, the force uniformity at both ends of the sealing belt 3 can be ensured, and the sealing uniformity between the sealing belt 3 and the pipeline 1 can be ensured.

[0060] After the test is completed, each connector 53 is removed to complete the separation of the sealing belt 3, and the sealing belt 3 is taken out from the pressure hole 411 to quickly complete the rapid disassembly of the entire testing device.

[0061] The connecting member 53 may be a bolt.

[0062] At least two clamping plates 52 and connecting members 53 are provided and arranged in a linear manner to form a multi-point connection structure between the stretching component 5 and the sealing belt 3 to ensure the force balance of the sealing belt 3.

[0063] See also Figure 3-Figure 8 In this embodiment: the force-applying component 6 includes at least two linear driving members 61 evenly distributed on the pressing block 4, the telescopic direction of each linear driving member 61 is the opening direction of the pressing hole 411, and each linear driving member 61 is connected to the pressing block 4 and the stretching component 5 at the same time.

[0064] By starting the force-applying component 6, a pulling force is indirectly applied to the end of the sealing belt 3 so that the sealing belt 3 is closely attached to the outer wall of the pipe 1 to ensure the sealing of the air chamber. At the same time, each linear drive member 61 can be started. As the end of the linear drive member 61 extends, the sealing becomes stronger.

[0065] On the basis of the above-mentioned embodiment, each linear driving member 61 is connected to the pressing plate 41 and the pulling plate 51 at the same time.

[0066] See also Figure 3-Figure 8 In this embodiment: each linear drive member 61 includes a sleeve rod 611 and two screw rods 612, one end of the two screw rods 612 is threadedly connected to the two ends of the sleeve rod 611, and the other end is fixedly connected to the pressing block 4 and the stretching assembly 5, and the rotation directions of the two screw rods 612 are opposite.

[0067] When a pulling force is indirectly applied to the end of the sealing belt 3 through the force-applying component 6, the sleeve rods 611 are rotated at the same time so that the two screws 612 move in opposite directions. In this way, the distance between the pressing block 4 and the stretching component 5 is increased, and the pressing block 4 forms pressure on the sealing belt 3, thereby enhancing the sealing between the sealing belt 3 and the pipeline 1.

[0068] The sleeve rod 611 is provided with an internal threaded hole along its length, and the internal threads at both ends of the internal threaded hole are in opposite directions to achieve the threaded connection of the two screw rods 612. The other ends of the two screw rods 612 are fixedly connected to the pressing plate 41 and the pulling plate 51 respectively.

[0069] As one of the parallel solutions of this embodiment, each linear driving member 61 includes a sleeve rod 611 and a screw rod 612. The sleeve rod 611 is provided with an internal threaded hole along its length direction, and one end of the sleeve rod 611 is rotatably connected to the pressing plate 41 or the pulling plate 51. One end of the screw rod 612 is threadedly connected to the other end of the sleeve rod 611, and the other end of the screw rod 612 is fixedly connected to the pulling plate 51 or the pressing plate 41. The entire linear driving member 61 can be extended by rotating the sleeve rod 611.

[0070] As the second parallel solution of this embodiment, the linear drive member 61 can also be a single-head cylinder, a double-head cylinder, etc.

[0071] See also Figure 4 , Figure 7 as well as Figure 8 In this embodiment: each sleeve rod 611 is formed with external teeth; the force-applying component 6 also includes a toothed ring 62 rotatably connected to the pressing block 4 and / or the stretching component 5, and the toothed ring 62 is simultaneously engaged with each sleeve rod 611.

[0072] When the two screw rods 612 are moved in opposite directions and the linear drive members 61 are extended at the same time, the sleeve rods 611 can be rotated at the same time by rotating the gear ring 62, so that the stretching assembly 5 always remains parallel to the pressing block 4, and the ends of the sealing belt 3 are subjected to the same magnitude and direction of tension at all locations, ensuring that the sealing strength and sealing effect of the sealing belt 3 and the pipeline 1 are the same at all locations, thereby ensuring the uniformity of the seal.

[0073] The axial thickness of the toothed ring 62 is smaller than the length of the section of the sleeve rod 611 having the external teeth, so as to ensure that when the sleeve rod 611 moves vertically relative to the toothed ring 62 during rotation, the sleeve rod 611 and the toothed ring 62 will not separate.

[0074] In this embodiment, a ring groove 621 is formed on the side of the gear ring 62, and the cross section of the ring groove 621 is stepped or dovetail-shaped; the force-applying assembly 6 further includes at least two suspension rods 63, one end of the suspension rod 63 is fixedly connected to the pressure plate 41 or the pull plate 51, and the other end is adapted and slidably connected to the ring groove 621. When the gear ring 62 is rotated by force, each suspension rod 63 keeps the balance of the gear ring 62, and the suspension rod 63 slides at the ring groove 621.

[0075] See also Figure 1-Figure 6 In this embodiment, the thickness of both ends of the sealing belt 3 gradually increases from the end to the middle.

[0076] As the force applied by the force-applying component 6 gradually increases, the length of the end of the sealing belt 3 extending out of the pressure hole 411 gradually increases. Under the action of the pressure hole 411, the mutual extrusion force between the two ends of the sealing belt 3 at the pressure hole 411 gradually increases. The greater the amount of adaptive deformation of the sealing belt 3 at this location and the amount filled at the angle a, the more the sealing performance can be further improved.

[0077] The sum of the thicknesses at the edges of both ends of the sealing belt 3 is smaller than the width of the opening of the pressure hole 411, so as to facilitate the insertion of the ends of the sealing belt 3 merged at both ends; and the maximum value of the sum of the thicknesses at both ends of the sealing belt 3 is greater than the width of the opening of the pressure hole 411, so as to ensure that the pressure plate 41 can apply maximum pressure to the sealing belt 3, and no gap will be left at the lower opening of the pressure hole 411.

[0078] Working principle: When testing the sealing performance of the ends of two pipes 1 connected to each other, first wrap the sealing tape 3 around the connecting ends of the two pipes 1, and make the air groove 31 of the sealing tape 3 cover the connecting part of the two pipes 1, so that the sealing tape 3 forms an air chamber connected to the detector 2 relative to the pipe 1, and at the same time, make the two end surfaces of the sealing tape 3 abut against each other; then, the two ends of the sealing tape 3 abutting against each other are simultaneously passed through the pressure hole 411 of the pressing block 4, and the two ends of the sealing tape 3 are simultaneously connected to the connecting piece 53 of the stretching component 5; thereafter, the two elastic sealing blocks 42 are respectively inserted into the two angles a formed by the two ends of the pressing plate 41, and the angle a gap formed by the two ends of the sealing tape 3 relative to the pipe 1 is filled; thereafter, the force-applying component 6 is connected to the pressing plate 41 and the stretching component 5 of the pressing block 4. The pull plates 51 of the components 5 are connected at the same time (specifically, they can be connected by screws, or directly fixed by welding). Finally, by rotating the gear ring 62, the sleeve rods 611 are driven to rotate at the same time, and the two screws 612 move in opposite directions, so that the pressure plate 41 and the pull plate 51 move away from each other. In this way, the pressure plate 41 moves toward the pipeline 1 relative to the pull plate 51 and presses the pipeline 1, and the two ends of the sealing belt 3 are extended toward the pull plate 51 relative to the pressure plate 41 at the same time, so that the sealing belt 3 is closely attached to the outer wall of the pipeline 1 to ensure the sealing of the air chamber. After that, the ends of the two pipelines 1 can be closed, and the pipeline sealing can be detected by introducing gas into the pipeline 1. If the value detected by the detector 2 does not change, it proves that there is no leakage. If the value changes, it proves that there is leakage.

[0079] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A natural gas pipeline sealing safety detection device, comprising a detector (2), characterized in that: It also includes a sealing belt (3), a pressing block (4) and a stretching assembly (5), wherein the sealing belt (3) is used to cover the pipeline (1), and the belt surfaces at both ends thereof abut against each other, the pressing block (4) is provided with a pressure hole (411) through it, the middle belt surface of the sealing belt (3) is provided with an air groove (31), and both ends pass through the pressure hole (411) at the same time, the stretching assembly (5) is detachably connected to the two ends of the sealing belt (3), the pressing block (4) and the stretching assembly (5) are simultaneously connected to a force-applying assembly (6), and the force-applying assembly (6) is used to drive the pressing block (4) and the stretching assembly (5) to move away from each other, and the detector (2) is installed on the sealing belt (3) and is connected to the air groove (31).

2. The natural gas pipeline sealing safety detection device according to claim 1 is characterized in that: The pressing block (4) comprises a pressing plate (41) and two elastic sealing blocks (42) one end of which is detachably connected to the two ends of the pressing plate (41), the two elastic sealing blocks (42) are both filled at the angle a formed by the two ends of the sealing belt (3) and are both used to abut against the pipeline (1) at the same time, and the pressing hole (411) is opened through the pressing plate (41).

3. The natural gas pipeline sealing safety detection device according to claim 2 is characterized in that: The lower sides of the two elastic sealing blocks (42) are each provided with a lower arc surface (421) for abutting against the pipeline (1), and both sides in the horizontal direction are provided with side arc surfaces (422), and the two side arc surfaces (422) respectively abut against the belt surfaces at both ends of the sealing belt (3).

4. The natural gas pipeline sealing safety detection device according to claim 2 is characterized in that: Two mounting holes (412) are provided at the lower opening of the pressure hole (411); the pressure block (4) further comprises two rollers (43), the two rollers (43) are rotatably connected to the two mounting holes (412) respectively, and the rolling surfaces of the two rollers are in contact with the belt surface of the sealing belt (3).

5. The natural gas pipeline sealing safety detection device according to claim 1 is characterized in that: The stretching assembly (5) comprises a pulling plate (51) and at least one clamping plate (52) fixedly connected to the pulling plate (51); the pulling plate (51) is connected to the force applying assembly (6); and the clamping plate (52) simultaneously clamps and is detachably connected to both ends of the sealing belt (3).

6. The natural gas pipeline sealing safety detection device according to claim 5 is characterized in that: The stretching assembly (5) further comprises at least one connecting piece (53), the number of the connecting pieces (53) being equal to the number of the clamping plates (52) and being detachably connected one by one; through holes for the connecting pieces (53) to pass through are provided at both ends of the sealing belt (3).

7. The natural gas pipeline sealing safety detection device according to claim 1 is characterized in that: The force-applying assembly (6) comprises at least two linear drive members (61) uniformly distributed on the pressing block (4), the extension direction of each linear drive member (61) being the opening direction of the pressing hole (411), and each linear drive member (61) being simultaneously connected to the pressing block (4) and the stretching assembly (5).

8. The natural gas pipeline sealing safety detection device according to claim 7 is characterized in that: Each of the linear drive members (61) comprises a sleeve rod (611) and two screw rods (612), one end of the two screw rods (612) are respectively threadedly connected to the two ends of the sleeve rod (611), and the other ends are respectively fixedly connected to the pressing block (4) and the stretching assembly (5), and the two screw rods (612) have opposite rotation directions.

9. The natural gas pipeline sealing safety detection device according to claim 8 is characterized in that: Each of the sleeve rods (611) is formed with external teeth; the force-applying assembly (6) further comprises a toothed ring (62) rotatably connected to the pressing block (4) and / or the stretching assembly (5), and the toothed ring (62) is simultaneously engaged with each of the sleeve rods (611).

10. The natural gas pipeline sealing safety detection device according to any one of claims 1 to 9, characterized in that: The thickness of both ends of the sealing belt (3) gradually increases from the end to the middle.

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