Natural gas pipeline sealing safety detection device

Abstract

The present application relates to a kind of natural gas pipeline leakproof safety detection device, including detector, also including sealing tape, briquetting and stretching component, the sealing tape is used to cover pipeline, and its two ends with face each other abut, the briquetting is through and is provided with pressure hole, the middle end of the sealing tape with face is provided with gas groove, and two ends pass through the pressure hole simultaneously, the stretching component is simultaneously detachably connected to the two ends of the sealing tape, the briquetting and the stretching component are simultaneously connected with force assembly, the force assembly is used to drive the briquetting and the stretching component away from each other, the detector is installed in sealing tape, and is connected with the gas groove.The present application can improve the technical problem that existing detection device cannot detect the leakproofness of pipeline connection of different pipe diameters.

Description

Technical Field

[0001] This invention relates to the field of sealing test technology, and specifically to a natural gas pipeline sealing safety test device. Background Technology

[0002] Natural gas is a flammable and explosive gas. If pipelines are poorly sealed and leaks occur, it will not only waste energy but may also cause serious safety accidents such as fires and explosions. Therefore, conducting leak tests is a necessary measure to ensure the safe transportation of natural gas.

[0003] Chinese Patent No. CN205879461U discloses a sealed natural gas pipeline interface sealing test device, including an upper pipe body and a lower pipe body hinged to one end of the upper pipe body. The bottom of one side of the upper pipe body is provided with a protrusion, and the top of one side of the lower pipe body is hinged with a latch. Sealing strips are provided at the joint of the upper pipe body and the lower pipe body. Upper sealing rings are provided at both ends of the inner wall of the upper pipe body, and lower sealing rings are provided at both ends of the inner wall of the lower pipe body. A natural gas detector is provided at the top of the upper pipe body, and a detection head penetrating the pipe wall of the upper pipe body is provided at the bottom of the natural gas detector.

[0004] The above solution achieves a sealing space relative to the pipe connection section through an upper pipe body, a lower pipe body, an upper sealing ring, a lower sealing ring, and a sealing strip. However, this method must ensure that the inner diameter formed by the upper and lower sealing rings is consistent with the outer diameter of the pipe to be tested; otherwise, the sealing effect cannot be met, and it is difficult to use for testing operations under different pipe diameter scenarios. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a natural gas pipeline sealing safety testing device to improve the technical problem that existing testing devices cannot test the sealing performance of pipeline connections with different diameters.

[0006] This invention is achieved through the following technical solution:

[0007] A natural gas pipeline sealing safety testing device includes a testing instrument, a sealing strip, a pressure block, and a tensioning assembly. The sealing strip is used to cover the pipeline, and its two ends abut against each other. The pressure block has a through-hole. The sealing strip has a gas groove on its middle end, and both ends pass through the pressure hole. The tensioning assembly is detachably connected to both ends of the sealing strip. The pressure block and the tensioning assembly are connected to a force-applying assembly, which is used to drive the pressure block and the tensioning assembly away from each other. The testing instrument is installed on the sealing strip and connected to the gas groove.

[0008] Furthermore, the pressure block includes a pressure plate and two elastic sealing blocks, one end of which is detachably connected to both ends of the pressure plate. Both elastic sealing blocks simultaneously fill the included angle α formed by the two ends of the sealing strip and are used to simultaneously abut against the pipe. The pressure hole is opened through the pressure plate.

[0009] Furthermore, both of the elastic sealing blocks have a lower arc surface on their lower sides for abutting against the pipe, and both sides in the horizontal direction have a side arc surface, which abut against the strip surfaces at both ends of the sealing strip respectively.

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

[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 strip.

[0012] Furthermore, the stretching assembly also includes at least one connector, the number of which is equal to the number of clamps, and each connector is detachably connected; both ends of the sealing strip are provided with through holes for the connectors to pass through.

[0013] Furthermore, the force-applying component includes at least two linear drive members evenly distributed on the pressure block, the extension and retraction direction of each linear drive member being the opening direction of the pressure hole, and each linear drive member being simultaneously connected to the pressure block and the tensioning component.

[0014] Furthermore, each of the linear drive components includes a sleeve and two screws, one end of each screw is threaded to both ends of the sleeve, and the other end is fixedly connected to the pressure block and the tensioning assembly, respectively.

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

[0016] Furthermore, the thickness of both ends of the sealing strip gradually increases from the ends towards the middle.

[0017] The beneficial effects of this invention are at least as follows:

[0018] This natural gas pipeline sealing safety testing device seals the pipeline connection with a sealing strip containing gas grooves, creating a gas chamber during the testing process. A detector monitors changes in gas pressure within the chamber to determine if a leak is detected. Simultaneously, a force-applying component allows the tensioning component and the pressure block to move in opposite directions, compressing the sealing strip and ensuring a tight seal between the sealing strip and the pipeline's outer wall. In other words, by varying the length of the sealing strip, pipes of different diameters can be covered. Furthermore, the continuous force applied by the force-applying component ensures the sealing strip adheres tightly to the pipeline's outer wall, preventing leaks. This addresses the technical limitation of existing testing devices that cannot test the sealing performance of pipe connections with different diameters.

[0019] This natural gas pipeline sealing safety testing device fills the gap at the angle α formed by the two ends of the sealing strip relative to the pipeline by inserting elastic sealing blocks. During the test, the force-applying component continuously applies force, causing the elastic sealing blocks to undergo adaptive deformation and further fill the gap at the angle α, thereby ensuring the sealing of the gas chamber.

[0020] This natural gas pipeline sealing safety testing device uses a sealing strip with a thickness that gradually increases from the end to the middle. When the sealing strip is pulled, the amount of adaptive deformation of the sealing strip at the pressure hole and the amount of filling at the included angle α is greater, thereby further improving the sealing performance.

[0021] Other advantages, objectives, and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination, or may be learned from practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0022] Figure 1 This is a structural diagram showing the usage state of the present invention;

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

[0024] Figure 3 For the present invention Figure 2 A partial sectional view;

[0025] Figure 4 For the present invention Figure 3 A partial structural diagram;

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

[0027] Figure 6For the present invention Figure 5 A magnified view of a portion of the image;

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

[0029] Figure 8 For the present invention Figure 7 A magnified view of part A in the image.

[0030] In the diagram: 1. Pipeline; 2. Detector; 3. Sealing strip; 31. Air groove; 32. Slot; 33. Slot; 34. 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. Insert block; 43. Roller; 5. Tension assembly; 51. Pull plate; 52. Clamping plate; 53. Connector; 6. Force application assembly; 61. Linear drive component; 611. Sleeve rod; 612. Screw rod; 62. Gear ring; 621. Ring groove; 63. Hanger rod. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0033] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[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 conventionally placed during use. These terms are used only for the convenience of describing the present invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0035] Furthermore, terms such as "identical" do not imply that components must be absolutely identical; minor differences are permissible. The term "perpendicular" simply means that the positional relationship between components is more perpendicular than "parallel," not that the structure must be perfectly perpendicular; a slight tilt is acceptable.

[0036] In existing technologies, pipe sealing tests typically focus on the sealing of welded joints. This involves sealing the pipe ends using devices such as airbags or valves to create a sealed channel within the pipe. Gas is then blown into this channel (as in Chinese Patent Application No. CN202110713777.2). The test is then performed on the outside of the weld using a testing instrument, or water is poured onto the weld, and the results are observed through air bubbles. The testing instrument can be an airtightness tester or a barometer connected to the channel.

[0037] Please see Figures 1-6 The present invention provides a technical solution: a natural gas pipeline sealing safety testing device, including a tester 2, a sealing strip 3, a pressure block 4, and a tensioning component 5. The sealing strip 3 is used to cover the pipeline 1, and its two ends abut against each other. The pressure block 4 has a through-hole 411. The middle end of the sealing strip 3 has a gas groove 31, and both ends pass through the pressure hole 411. The tensioning component 5 is detachably connected to both ends of the sealing strip 3. The pressure block 4 and the tensioning component 5 are connected to a force-applying component 6, which is used to drive the pressure block 4 and the tensioning component 5 away from each other. The tester 2 is installed on the sealing strip 3 and connected to the gas groove 31.

[0038] When testing the sealing performance of the connection between two pipes 1, first wrap the sealing tape 3 around the connection end of the two pipes 1, ensuring that the air groove 31 of the sealing tape 3 covers the connection point of the two pipes 1. The sealing tape 3 forms an air chamber for the testing instrument 2 relative to the pipes 1, while ensuring that the two ends of the sealing tape 3 abut against each other. Then, the two abutting ends of the sealing tape 3 simultaneously pass through the pressure hole 411 of the pressure block 4, and both ends of the sealing tape 3 are simultaneously connected to the tensioning component 5. Afterward, the force-applying component 6 is simultaneously connected to the pressure block 4 and the tensioning component 5. Finally... By activating the force-applying component 6, the pressure block 4 and the tensioning component 5 are moved away from each other. Thus, the pressure block 4 moves relative to the tensioning component 5 towards the pipe 1 and presses against it. Simultaneously, both ends of the sealing strip 3 extend relative to the pressure block 4 towards the tensioning component 5, ensuring the sealing strip 3 is tightly fitted against the outer wall of the pipe 1, guaranteeing a seal in the air chamber. Afterward, the ends of both pipes 1 can be sealed, and the pipe's sealing performance can be tested by introducing gas into the pipe 1. If the value detected by the detector 2 remains unchanged, it indicates no leakage; if the value changes, it indicates leakage. Through this testing method, the sealing strip 3 can cover pipes 1 of different diameters, and under the continuous force applied by the force-applying component 6, it can ensure that the sealing strip 3 is tightly fitted against the outer wall of the pipe 1, preventing leakage. This improves upon the technical problem that existing testing devices cannot test the sealing performance of pipe connections with different diameters.

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

[0040] Before the two ends of the sealing strip 3 that are abutting each other simultaneously pass through the pressure hole 411 of the pressure block 4, the locking block 34 can be inserted from the slot 33 and slid into the slot 32 until the locking block 34 is fully engaged in the slot 32. By engaging the locking block 34 into the slot 32 in this way, it can be ensured that the two ends of the sealing strip 3 will not separate.

[0041] The slot 32 can 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 strip 3 can be made of materials such as rubber or silicone. In this embodiment, the width of the sealing strip 3 is equal to the opening length of the pressure hole 411, and the sum of the thicknesses at both ends of the sealing strip 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 strip 3 is greater than the opening width of the pressure hole 411, the sealing strip 3 is compressed to pass through the pressure hole 411.

[0043] The detection probe of the detector 2 extends into the air tank 31.

[0044] Please see Figures 1-4 In this embodiment: the pressure block 4 includes a pressure plate 41 and two elastic sealing blocks 42 that are detachably connected to both ends of the pressure plate 41. Both elastic sealing blocks 42 simultaneously fill the included angle a formed by the two ends of the sealing strip 3, and both are used to simultaneously abut against the pipe 1. The pressure hole 411 is opened through the pressure plate 41.

[0045] After the two ends of the sealing strip 3 abutting each other simultaneously pass through the pressure hole 411 of the pressure plate 41, the two ends of the sealing strip 3 form an angle α with respect to the pipe 1. At this time, the two elastic sealing blocks 42 are respectively inserted into the two angles α formed by the two ends of the pressure plate 41 to fill the gap of the angle α formed by the two ends of the sealing strip 3 with respect to the pipe 1, so as to ensure the air chamber is sealed during the test. During the test, as the force application component 6 continuously applies force, the pressure block 4 continuously squeezes the pressure plate 41, and the pressure plate 41 continuously squeezes the elastic sealing block 42. The elastic sealing block 42 undergoes adaptive deformation and further fills the angle α, thereby ensuring the air chamber is sealed.

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

[0047] In this embodiment, each of the two elastic sealing blocks 42 has a fixedly connected insert block 423 at its opposite ends. The insert 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, an insertion hole is provided on the side of the pressure plate 41 for the other end of the insert block 423 to be inserted to achieve plug-in installation. In this way, after the two ends of the sealing strip 3 that are abutting each other pass through the pressure hole 411 of the pressure plate 41 at the same time, force can be applied to the pressure plate 41 to initially press it toward the pipe 1, and then the insert block 423 is inserted into the pressure plate 41 until the elastic sealing block 42 is inserted at the included angle a.

[0049] As a second alternative, the plug 423 can also be installed by riveting, snap-fitting, or other methods.

[0050] In this embodiment: both elastic sealing blocks 42 have a lower arc surface 421 for abutting against the pipe 1 on their lower sides, and a side arc surface 422 is provided on both sides in the horizontal direction. The two side arc surfaces 422 abut against the strip surfaces at both ends of the sealing strip 3 respectively.

[0051] When the elastic sealing block 42 is inserted into the two included 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 pipe 1. At the same time, the two side arc surfaces 422 form an arc surface contact with the arc surface of the bend of the sealing strip 3 to reduce the possibility of air leakage due to small pores and ensure the sealing effect.

[0052] Please see Figures 1-4 In this embodiment: two mounting holes 412 are provided at the lower opening of the pressure hole 411; the pressure block 4 also includes two rollers 43, which are rotatably connected to the two mounting holes 412 respectively, and the rolling surfaces of the two rollers abut against the surface of the sealing strip 3.

[0053] When the end of the sealing strip 3 moves toward the tensioning 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 friction, so that the sealing strip 3 is pulled smoothly; and when the sealing strip 3 is pressed down by the pressure plate 41, the roller 43 abuts against the surface of the sealing strip 3 to form an arc surface contact, which can prevent the sealing strip 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 included angle α due to the excessive change angle of the bending surface of the sealing strip 3.

[0054] Roller 43 is a stepped shaft, with the diameters at both ends smaller than the diameter at the middle end. Roller 43 can be rotatably mounted via bearings.

[0055] Please see Figures 1-6 In this embodiment: the tensioning component 5 includes a tension plate 51 and at least one clamping plate 52 fixedly connected to the tension plate 51. The tension plate 51 is connected to the force application component 6, and the clamping plate 52 simultaneously clamps and is detachably connected to both ends of the sealing strip 3.

[0056] After the two ends of the sealing strip 3 that abut against each other pass through the pressure hole 411 of the pressure block 4, the two ends of the sealing strip 3 are connected to the clamping plate 52 of the tensioning component 5. Then, the force-applying component 6 is connected to the pressure block 4 and the pull plate 51 of the tensioning component 5 at the same time, so that the force applied by the force-applying component 6 applies a tension to the end of the sealing strip 3 through the pull plate 51 and the clamping plate 52, so that a seal is formed between the sealing strip 3 and the pipe 1.

[0057] The clamp 52 has an inverted "U" shape, with the closed end fixedly connected to the pull plate 51 and the open end opening downwards so that the two ends of the parallel sealing strips 3 can be inserted simultaneously.

[0058] In this embodiment, the stretching assembly 5 further includes at least one connector 53, the number of connectors 53 being equal to the number of clamps 52, and each connector is detachably connected; both ends of the sealing strip 3 are provided with through holes for the connectors 53 to pass through.

[0059] After the two ends of the sealing strip 3 that abut against each other are simultaneously passed through the pressure hole 411 of the pressure block 4, the connector 53 is simultaneously passed through the through holes at both ends of the sealing strip 3, and the connector 53 is connected to the corresponding clamp 52. Then, the force application component 6 is simultaneously connected to the pressure block 4 and the tensioning component 5's pull plate 51, and subsequent fastening work can be carried out. By connecting the two ends of the sealing strip 3 of the connector 53 at the same time, the uniform force on both ends of the sealing strip 3 can be ensured, and the uniform sealing between the sealing strip 3 and the pipe 1 can be ensured.

[0060] After the test is completed, remove each connector 53 to separate the sealing strip 3, and remove the sealing strip 3 from the pressure hole 411 to quickly disassemble the entire test device.

[0061] Among them, the connecting part 53 can be a bolt.

[0062] At least two clamping plates 52 and connectors 53 are provided and arranged linearly to form a multi-point connection structure between the tension assembly 5 and the sealing strip 3, ensuring the force balance of the sealing strip 3.

[0063] Please see Figures 3-8 In this embodiment, the force application component 6 includes at least two linear drive members 61 evenly distributed on the pressure block 4. The extension and retraction direction of each linear drive member 61 is the opening direction of the pressure hole 411, and each linear drive member 61 is simultaneously connected to the pressure block 4 and the tensioning component 5.

[0064] By activating the force application component 6, a pulling force is indirectly applied to the end of the sealing strip 3 so that the sealing strip 3 is tightly attached to the outer wall of the pipe 1 to ensure the sealing of the air chamber. At the same time, each linear drive component 61 can be activated. As the end of the linear drive component 61 extends, the sealing performance becomes stronger.

[0065] Based on the above embodiments, each linear drive component 61 is simultaneously connected to the pressure plate 41 and the pull plate 51.

[0066] Please see Figures 3-8 In this embodiment, each linear drive component 61 includes a sleeve rod 611 and two screw rods 612. One end of each screw rod 612 is threaded to both ends of the sleeve rod 611, and the other end is fixedly connected to the pressure block 4 and the tensioning assembly 5, respectively. The two screw rods 612 have opposite directions of rotation.

[0067] When tension is applied indirectly to the end of the sealing strip 3 through the force-applying component 6, each sleeve rod 611 is rotated at the same time so that the two screw rods 612 move in opposite directions. In this way, the distance between the pressure block 4 and the tensioning component 5 increases, the pressure block 4 exerts pressure on the sealing strip 3, and the sealing performance between the sealing strip 3 and the pipe 1 is enhanced.

[0068] The sleeve rod 611 has a threaded hole extending along its length, with the two ends of the threaded hole having opposite directions of internal thread rotation, so as to achieve a threaded connection between the two screw rods 612. The other ends of the two screw rods 612 are respectively fixedly connected to the pressure plate 41 and the pull plate 51.

[0069] As one of the parallel solutions in this embodiment, each linear drive component 61 includes a sleeve 611 and a screw 612. The sleeve 611 has a threaded hole extending through it along its length, and one end of the sleeve 611 is rotatably connected to the pressure plate 41 or the pull plate 51. One end of the screw 612 is threadedly connected to the other end of the sleeve 611, and the other end of the screw 612 is fixedly connected to the pull plate 51 or the pressure plate 41. The extension of the entire linear drive component 61 is achieved by rotating the sleeve 611.

[0070] As a second alternative in this embodiment, the linear drive 61 can also be a single-head cylinder, a double-head cylinder, etc.

[0071] Please see Figure 4 , Figure 7 as well as Figure 8 In this embodiment: each sleeve rod 611 is formed with external teeth; the force application component 6 also includes a toothed ring 62 rotatably connected to the pressure block 4 and / or the tensioning component 5, and the toothed ring 62 simultaneously engages with each sleeve rod 611.

[0072] When the two screws 612 move in opposite directions and the linear drive components 61 extend simultaneously, the gear ring 62 can be rotated to make each sleeve rod 611 rotate simultaneously, so that the tensioning component 5 always remains parallel to the pressure block 4, and the ends of the sealing strip 3 are subjected to the same magnitude and direction of tension, ensuring that the sealing strength and sealing effect of the sealing strip 3 and the pipe 1 are the same, and ensuring the uniformity of the seal.

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

[0074] In this embodiment, the toothed ring 62 has an annular groove 621 on its side, and the cross-section of the annular groove 621 is stepped or dovetail-shaped. The force-applying component 6 also includes at least two lifting rods 63, one end of which is fixedly connected to the pressure plate 41 or the pull plate 51, and the other end is adapted and slidably connected to the annular groove 621. When the toothed ring 62 rotates under force, each lifting rod 63 maintains the balance of the toothed ring 62, and the lifting rod 63 slides at the annular groove 621.

[0075] Please see Figures 1-6 In this embodiment, the thickness of both ends of the sealing strip 3 gradually increases from the ends towards the middle.

[0076] As the force applied by the force-applying component 6 gradually increases, the length of the sealing strip 3 extending out of the pressure hole 411 gradually increases. Under the action of the pressure hole 411, the mutual squeezing force between the two ends of the sealing strip 3 at the pressure hole 411 gradually increases. The sealing strip 3 undergoes adaptive deformation at this point and fills the included angle a more, thereby further improving the sealing performance.

[0077] The sum of the thicknesses at the edges of both ends of the sealing strip 3 is less than the width of the opening of the pressure hole 411, so as to facilitate the insertion of the sealed strip 3 ends joined together at both ends; and the maximum value of the sum of the thicknesses at both ends of the sealing strip 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 the maximum pressure to the sealing strip 3, and that no gap is left at the lower opening of the pressure hole 411.

[0078] Working principle: When testing the sealing performance of the connection between two pipes 1, the sealing tape 3 is first wrapped around the connection end of the two pipes 1, so that the air groove 31 of the sealing tape 3 covers the connection of the two pipes 1. The sealing tape 3 forms an air chamber for the testing instrument 2 relative to the pipes 1, and the two ends of the sealing tape 3 abut against each other. Then, the two ends of the sealing tape 3 that abut against each other pass through the pressure hole 411 of the pressure block 4, and the two ends of the sealing tape 3 are connected to the connecting piece 53 of the tensioning component 5. After that, the two elastic sealing blocks 42 are respectively inserted into the two included angles α formed by the two ends of the pressure plate 41 to fill the gap between the two ends of the sealing tape 3 and the pipes 1. Then, the force application component 6 is connected to the pressure plate 41 of the pressure block 4 and the tensioning component 5. The pull plates 51 of component 5 are connected simultaneously (specifically, they can be connected by screws or directly welded). Finally, by rotating the gear ring 62, each sleeve rod 611 is driven to rotate simultaneously, and the two screws 612 move in opposite directions, causing the pressure plate 41 and the pull plate 51 to move away from each other. In this way, the pressure plate 41 moves towards the pipe 1 relative to the pull plate 51 and presses the pipe 1, while the two ends of the sealing strip 3 extend towards the pull plate 51 relative to the pressure plate 41, so that the sealing strip 3 is tightly attached to the outer wall of the pipe 1, ensuring the air chamber is sealed. After that, the ends of the two pipes 1 can be sealed, and the pipe sealing can be tested by introducing gas into the pipe 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 solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A natural gas pipeline sealing safety testing device, comprising a testing instrument (2), characterized in that: It also includes a sealing strip (3), a pressure block (4), and a tensioning assembly (5). The sealing strip (3) is used to cover the pipe (1), and its two ends abut against each other. The pressure block (4) has a through-hole (411). The middle end of the sealing strip (3) has an air groove (31), and both ends pass through the pressure hole (411). The tensioning assembly (5) is detachably connected to both ends of the sealing strip (3). The pressure block (4) and the tensioning assembly (5) are connected to a force-applying assembly (6). The force-applying assembly (6) is used to drive the pressure block (4) and the tensioning assembly (5). The extension components (5) are far apart from each other. The detector (2) is installed on the sealing strip (3) and connected to the air groove (31). The pressure block (4) includes a pressure plate (41) and two elastic sealing blocks (42) with one end detachably connected to both ends of the pressure plate (41). The two elastic sealing blocks (42) are filled at the included angle a formed by the two ends of the sealing strip (3) and are used to simultaneously abut against the pipe (1). The pressure hole (411) is opened through the pressure plate (41). The thickness of both ends of the sealing strip (3) gradually increases from the end to the middle. The width of the sealing strip (3) is... The length is equal to the opening length of the pressure hole (411), and the sum of the thicknesses at both ends of the sealing strip (3) is not less than the opening width of the pressure hole (411); the tensioning assembly (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 assembly (6), and the clamping plate (52) simultaneously clamps and is detachably connected to both ends of the sealing strip (3); the tensioning assembly (5) also includes at least one connector (53), the number of connectors (53) is equal to the number of clamping plates (52), and they are detachably connected one by one; The connector (53) is made of bolts; both ends of the sealing strip (3) are provided with through holes for the connector (53) to pass through; a slot (32) is provided at one end of the sealing strip (3), the slot (32) is provided on the side edge of that end, the slot (32) and the air groove (31) are located on the same side of the sealing strip (3), and a slot (33) is provided on the groove wall of the slot (32). A block (34) is formed at the other end of the sealing strip (3) to fit and slide in the slot (32); the slot (32) can be a stepped groove or a dovetail groove, and the slot (33) is a "U" shaped groove.

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

3. The natural gas pipeline sealing safety testing device according to claim 1, characterized in that: The lower opening of the pressure hole (411) has two mounting holes (412); the pressure block (4) also includes 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 abut against the surface of the sealing strip (3).

4. The natural gas pipeline sealing safety testing device according to claim 1, characterized in that: The force application component (6) includes at least two linear drive members (61) evenly distributed on the pressure block (4), the extension and retraction direction of each linear drive member (61) is the opening direction of the pressure hole (411), and each linear drive member (61) is simultaneously connected to the pressure block (4) and the tensioning component (5).

5. The natural gas pipeline sealing safety testing device according to claim 4, characterized in that: Each of the linear drive components (61) includes a sleeve (611) and two screws (612). One end of each screw (612) is threaded to both ends of the sleeve (611), and the other end is fixedly connected to the pressure block (4) and the tensioning assembly (5), respectively. The two screws (612) have opposite directions of rotation.

6. The natural gas pipeline sealing safety testing device according to claim 5, characterized in that: Each of the sleeve rods (611) is formed with external teeth; the force application component (6) also includes a toothed ring (62) rotatably connected to the pressure block (4) and / or the tension component (5), and the toothed ring (62) simultaneously engages with each of the sleeve rods (611).

Images