Fire-fighting pipeline butt joint sealing test device

Abstract

The utility model relates to the technical field of fire-fighting pipeline detection, in particular to a fire-fighting pipeline butt joint sealing testing device which comprises an upper pipe sleeve, a lower pipe sleeve, a rotating shaft and a fixing assembly, the upper pipe sleeve is a half pipe with fixing notches in the two ends, and sealing rings are fixedly connected to the side wall of the upper pipe sleeve in the length direction and the arc-shaped faces of the fixing notches; an air inlet pipe head is fixedly connected to the middle of the outer arc face of the upper pipe sleeve, the lower pipe sleeve and the upper pipe sleeve are the same in structure and internally provided with sealing rings, the upper pipe sleeve is hinged to the lower pipe sleeve, a pressure gauge is fixedly connected to the outer arc face of the lower pipe sleeve, and a fixing assembly is fixedly connected to the sides, away from the rotating shaft, of the upper pipe sleeve and the lower pipe sleeve and comprises a fixing base, a tooth block, a pull rod, a spring and a rack. The fixing seat is fixedly connected to the lower pipe sleeve and provided with a connecting hole, the tooth block is installed in the fixing seat, the pull rod is inserted into the connecting hole and penetrates through the spring to be fixedly connected to the plane of the tooth block, one section of the rack is fixedly connected to the outer wall of the upper pipe sleeve, the other section of the rack can be meshed with the tooth block, and the effect of accurately detecting the sealing performance of the butt joint position of the fire fighting pipeline is achieved.

Description

Technical Field

[0001] This application relates to the field of fire protection pipeline testing technology, and in particular to a fire protection pipeline connection sealing test device. Background Technology

[0002] In current urban construction, fire protection measures are an essential part. The application of fire protection pipelines in the fire protection system is a very important component. Fire protection pipelines are mainly pipeline materials that connect fire protection equipment and materials and transport fire extinguishing water, gas or other media. Due to special needs, the thickness and materials of fire protection pipelines have special requirements. Fire protection pipelines are usually connected by welding, flanges, threads and clamps, and are painted with red paint for identification. Fire protection pipelines also need to undergo regular airtightness testing.

[0003] Existing equipment for testing the airtightness of fire protection pipelines generally employs the pressure drop method, bubble detection method, and water leakage detection method. The pressure drop method involves introducing air into the pipeline, recording pressure changes, and calculating the pressure drop to determine the overall airtightness of the pipeline. Another method, the bubble detection method, involves placing the pipeline system in water, sealing one end of the pipeline, and applying pressure to the other end to observe whether bubbles are generated. Alternatively, water can be injected into the pipeline to observe for leaks at pipe joints to test the seal.

[0004] The existing technical solutions mentioned above have the following drawbacks: the bubble method and the water seepage method require manual visual observation of the bubbles discharged from the pipeline to determine the air tightness. However, during the detection process, it is necessary to continuously observe whether bubbles are generated at the pipeline connection, which is not only inefficient and wasteful of manpower, but also makes it difficult to detect tiny leaks and is prone to errors. Utility Model Content

[0005] This application provides a fire pipeline connection sealing test device to accurately test the sealing performance of fire pipeline connections.

[0006] The above-mentioned technical objective of this application is achieved through the following technical solution:

[0007] A fire-fighting pipeline connection sealing test device is used to test the pipeline. The pipeline has a flange fixed to its end. The test device includes an upper pipe sleeve, a lower pipe sleeve, a rotating shaft, and a fixing component. The upper pipe sleeve is a half-pipe with fixed notches at both ends. The upper pipe sleeve is fitted over the pipeline. The diameter of the upper pipe sleeve is larger than the diameter of the flange. The arc-shaped surface of the fixed notch fits against the outer wall of the pipeline. A sealing ring is fixed to the side wall of the upper pipe sleeve along its length and the arc-shaped surface of the fixed notch. An air inlet head is fixed to the middle of the outer arc surface of the upper pipe sleeve. The air inlet head connects the inside and outside of the upper pipe sleeve and a valve is installed on the air inlet head.

[0008] The lower sleeve has the same structure as the upper sleeve and is also equipped with a sealing ring inside. The upper sleeve and the lower sleeve are connected by the rotating shaft. A pressure gauge is fixedly connected to the middle of the outer arc surface of the lower sleeve. The pressure gauge connects the inside and outside of the lower sleeve. The fixing component is fixedly connected to the upper sleeve and the lower sleeve on the side away from the rotating shaft.

[0009] The fixing component includes a fixing seat, a toothed block, a pull rod, a spring, and a rack. The fixing seat is fixedly connected to the lower tube sleeve. The fixing seat includes a limiting box and a supporting foot. The opening of the limiting box faces the lower tube sleeve. A connecting hole is provided at the bottom of the limiting box. One end of the supporting foot is fixedly connected to the opening position of the limiting box opposite to the two box walls, and the other end of the supporting foot is fixedly connected to the lower side wall of the lower tube sleeve.

[0010] The toothed block is installed inside the limiting box, and the pull rod is inserted into the connecting hole. One end of the pull rod passes through the spring and is fixed to the plane of the toothed block, while the other end is located outside the limiting box. One end of the spring is fixed to the outside of the connecting hole opening, and the other end is fixed to the plane of the toothed block. The naturally extended spring pushes the locking block out of the limiting box. One section of the rack is fixed to the outer wall of the upper tube sleeve, and the other section can mesh with the toothed block.

[0011] By adopting the above technical solution, when the upper and lower sleeves are fitted onto the outside of the pipe, the rack and toothed block contact each other. The engagement between the teeth causes the toothed block to compress the spring and retract into the limiting groove. The toothed block locks the rack in place, facilitating the fixation of the upper and lower sleeves. The upper and lower sleeves are fastened together, and the sealing rings abut against each other to seal the cavity between the upper and lower sleeves. After pressurizing the cavity to a certain value through the air inlet, the air inlet is sealed. The pressure gauge reading is observed to determine the sealing performance of the fire-fighting pipe connection. The operation is simple and the measurement results are more accurate. After the test, pulling the lever compresses the spring, causing the toothed block to retract into the limiting box and separating the teeth of the toothed block and rack. The upper sleeve can then be opened to complete disassembly, facilitating assembly and disassembly and simplifying the operation of the device.

[0012] Optionally, two limiting plates are fixedly connected to the inner arc surfaces of the upper and lower sleeves, respectively. The limiting plates are semi-circular, and the two limiting plates are arranged in parallel at intervals to form a first cavity. The outer diameter of the limiting plate is equal to the inner diameter of the upper sleeve, and the inner diameter of the limiting plate is equal to the outer diameter of the pipe. The two ends of the limiting plate are flush with the side wall of the upper sleeve, and the distance between the two limiting plates is greater than the thickness of the flange.

[0013] By adopting the above technical solution, the flange is clamped in the first cavity during testing, which plays a limiting role during measurement, making the device more stable after being sleeved on the pipeline. It does not shift during the measurement process, avoiding pressure loss of the sealing rings at both ends of the upper and lower sleeves due to displacement, and making it easier to ensure the stability of the cavity pressure in the sleeve.

[0014] Optionally, a sealing groove is provided on the inner arc surface of the limiting plate. The length of the sealing groove is equal to the length of the inner arc surface of the limiting plate, and the sealing groove is open at both ends. A sealing strip adapted to the sealing groove is fixedly connected inside the sealing groove. One side of the sealing strip is fixedly connected to the bottom of the sealing groove, and the other side is higher than the opening of the sealing groove.

[0015] By adopting the above technical solution, after the upper sleeve and the lower sleeve are fastened together, the sealing strip adheres to the outer wall of the pipe, which helps to enhance the sealing of the first cavity.

[0016] Optionally, the limiting plate is spaced from the inner edges of the upper and lower sleeves, forming two spaced and independent second cavities. Two pressure gauges communicating with the second cavities are fixed to the outer arc surface of the lower sleeve.

[0017] By adopting the above technical solution, after the upper and lower sleeves are fastened together, the two second cavities are in a sealed state. When pressure is applied to the first cavity to test the sealing performance of the pipe joint, if the upper and lower sleeves are not fully fastened together, the poor sealing performance of the first cavity will cause pressure to leak into the second cavity, increasing the pressure in the second cavity. Observing the pressure gauge in the second cavity helps to judge the sealing performance of the first cavity and the sealing performance of the pipe joint.

[0018] Optionally, the sealing ring includes a rectangular sealing ring body and a protruding ridge integrally formed on one side wall of the sealing ring body. The sealing ring body is divided into an inner ring and an outer ring by the protruding ridge, and the sealing ring body is completely bonded to the side wall of the upper sleeve.

[0019] By adopting the above technical solution, the cross-section of the sealing ring is T-shaped, and the sealing ring after being fixed together enhances the sealing performance after the upper and lower sleeves are closed.

[0020] Optionally, the inner ring of the sealing ring and the side near the protruding ridge are machined to form an inclined surface, and the inclined surface forms a notch with the inner wall of the upper sleeve.

[0021] By adopting the above technical solution, when the first cavity and the second cavity are pressurized during the test, the inner ring of the sealing ring body is relatively squeezed after being subjected to pressure, which further enhances the sealing performance after the upper and lower sleeves are closed.

[0022] Optionally, mounting grooves are provided on the side walls along the length of the upper and lower sleeves and on the arc-shaped surface of the fixing notch, and the mounting grooves are adapted to the protruding ridges of the sealing ring.

[0023] By adopting the above technical solution, the convex edge of the sealing ring is fixed in the installation groove, so that the bottom surface of the sealing ring body is in contact with the side wall of the sleeve, making the sealing ring installation more secure.

[0024] Optionally, a pull button is fixed to the end of the pull rod away from the toothed block, and the bottom diameter of the pull button is larger than the diameter of the connecting hole.

[0025] By adopting the above technical solution, the pull button can be abutted against the outside of the connection hole, making it easier and less strenuous to pull the lever.

[0026] In summary, this application has the following technical effects:

[0027] 1. By incorporating a spring, the toothed block and the rack can automatically mesh;

[0028] 2. By setting a sealing strip installed on the limit plate, the sealing performance of the first cavity is enhanced, which helps to maintain the pressure of the first cavity after pressurization;

[0029] 3. By setting a pull button fixed to the pull rod, it is easier and less effort to pull the pull rod. Attached Figure Description

[0030] Figure 1 This is a structural diagram of this application after it has been opened;

[0031] Figure 2 This is a cross-sectional view of this application;

[0032] Figure 3 This is a cross-sectional view from another angle of this application.

[0033] Explanation of reference numerals in the attached drawings: 1. Pipe; 2. Flange; 3. Upper pipe sleeve; 31. Fixing notch; 32. Mounting groove; 33. Sealing ring; 34. Limiting plate; 341. Sealing groove; 342. Sealing strip; 35. Air inlet head; 4. Lower pipe sleeve; 41. Pressure gauge; 5. Rotating shaft; 6. Fixing assembly; 61. Fixing base; 611. Limiting box; 612. Limiting groove; 613. Connecting hole; 614. Support foot; 62. Tooth block; 63. Pull rod; 64. Pull button; 65. Spring; 66. Rack; Detailed Implementation

[0034] The present application will be further described in detail below with reference to the accompanying drawings.

[0035] This application discloses a fire-fighting pipeline connection sealing test device, referring to... Figure 1 The testing device is used to test pipe 1, and a flange 2 is fixedly connected to the end of pipe 1. The testing device includes an upper sleeve 3 for fitting onto pipe 1, a lower sleeve 4 arranged opposite to the upper sleeve 3, a rotating shaft 5 connecting the upper sleeve 3 and the lower sleeve 4, and a fixing assembly 6 for fixing the upper sleeve 3 and the lower sleeve 4. The upper sleeve 3 and the lower sleeve 4 are interlocked to form a cylindrical shape and can be fitted onto the flange 2.

[0036] Reference Figure 1 and reference Figure 2The upper sleeve 3 is a half-pipe closed at both ends. The diameter of the upper sleeve 3 is larger than the diameter of the flange 2, and fixing notches 31 are provided on both end faces. The fixing notches 31 are semi-circular and are concentric with the end faces of the upper sleeve 3. The diameter of the fixing notches 31 is equal to the outer diameter of the pipe 1. Installation grooves 32 are provided on the side wall of the upper sleeve 3 along its length and on the arc surface of the fixing notches 31. The installation grooves 32 are provided around the side wall of the upper sleeve 3 and are located in the middle of the side wall. The width of the installation grooves 32 is smaller than the width of the side wall of the upper sleeve 3. A sealing ring 33 is fixedly connected in the installation grooves 32.

[0037] Reference Figure 2 The sealing ring 33 includes a rectangular sealing ring body and a protruding ridge integrally formed on one side wall of the sealing ring body. The sealing ring 33 has a T-shaped cross-section. The protruding ridge is adapted to, snaps into, and is fixed within the mounting groove 32. The sealing ring body is divided into an inner ring and an outer ring by the protruding ridge. The inner ring of the sealing ring body has an inclined surface machined on the side closest to the protruding ridge, and the inclined surface forms a notch with the inner wall of the upper sleeve 3. The outer ring of the sealing ring body is bonded to the side wall of the upper sleeve 3.

[0038] Reference Figure 1 Two limiting plates 34 are fixedly attached to the inner arc surface of the upper pipe sleeve 3. The two limiting plates 34 are semi-circular and spaced apart. The outer diameter of the limiting plates 34 is equal to the inner diameter of the upper pipe sleeve 3, and the inner diameter of the limiting plates 34 is equal to the outer diameter of the pipe 1. The outer arc surface of the limiting plates 34 is fixed to the inner arc surface of the upper pipe sleeve 3. The two ends of the limiting plates 34 are flush with the side wall of the upper pipe sleeve 3. The distance between the two limiting plates 34 is greater than the thickness of the flange 2. A sealing groove 341 is provided in the middle of the inner arc surface of the limiting plates 34.

[0039] Reference Figure 1 The length of the sealing groove 341 is equal to the length of the inner arc surface of the limiting plate 34, and the sealing groove 341 is open at both ends. A sealing strip 342 is installed inside the sealing groove 341. The width of the sealing strip 342 is equal to the width of the sealing groove 341 and can be locked inside the sealing groove 341. The length of the sealing strip 342 is equal to the length of the sealing groove 341. The thickness of the sealing strip 342 is greater than the thickness of the mounting groove 32. One side of the sealing strip 342 is bonded to the bottom of the mounting groove 32, and the other side is higher than the opening of the mounting groove 32. Both ends of the sealing strip 342 are flush with the end face of the limiting plate 34.

[0040] Reference Figure 2The lower sleeve 4 has the same structure as the upper sleeve 3 and is also equipped with a sealing ring 33, a limiting plate 34, and a sealing strip 342 inside. When the upper sleeve 3 and the lower sleeve 4 are fitted onto the pipe 1, the flange 2 is located between the two limiting plates 34, and the sealing strip 342 is in contact with the outer wall of the pipe 1, so that the two sets of limiting plates 34 form a first cavity. The surfaces of the sealing rings 33 on the side walls of the upper sleeve 3 and the lower sleeve 4 are in contact with each other, and the sealing rings 33 inside the hole wall of the fixing notch 31 are in contact with the outer wall of the pipe 1. After the upper sleeve 3 and the lower sleeve 4 are closed, their two end faces and the corresponding limiting plates 34 form two second cavities, which are located on both sides of the first cavity. When the upper sleeve 3 and the lower sleeve 4 are fitted onto the pipe 1, the first cavity and the second cavity are independent and are sealed respectively.

[0041] Reference Figure 2 An air inlet head 35 is fixedly connected to the middle of the outer arc surface of the upper sleeve 3. The air inlet head 35 connects the inside and outside of the upper sleeve 3. A valve is installed on the air inlet head 35 to control the connection and closure of the first cavity with the outside.

[0042] Reference Figure 1 The lower sleeve 4 has three pressure measuring holes spaced apart on the top of its outer arc surface. These holes are vertically positioned and connected to the first cavity and the two second cavities, respectively. A pressure gauge 41, a high-precision pressure gauge, is fixedly connected to the outer opening of each pressure measuring hole and is used to measure the pressure changes in the first and second cavities.

[0043] Reference Figure 1 Two rotating shafts 5 are provided, and the two rotating shafts 5 are fixedly connected at intervals to the outer wall of the upper tube sleeve 3 and the lower tube sleeve 4 on the same side. The rotating shaft 5 includes a bushing and a shaft core inserted in the bushing. The bushing is fixedly connected to the outer wall of the lower tube sleeve 4 near the side wall, and the shaft core is fixedly connected to the outer wall of the upper tube sleeve 3 near the side wall. The upper tube sleeve 3 and the lower tube sleeve 4 are connected by the rotating shafts 5 so that the upper tube sleeve 3 and the lower tube sleeve 4 can be folded and fastened.

[0044] Reference Figure 3 There are two fixing components 6, which are arranged at intervals and fixed to the outer walls of the upper sleeve 3 and the lower sleeve 4 on the side opposite to the rotating shaft 5. The fixing component 6 includes a fixing seat 61 fixed to the lower sleeve 4, a toothed block 62 mounted on the fixing seat 61, a pull rod 63 connected to the toothed block 62, a spring 65 sleeved on the pull rod 63, and a rack 66 fixed to the upper sleeve 3.

[0045] Reference Figure 3 The fixed base 61 includes a limiting box 611 and two support feet 614. The limiting box 611 is a rectangular block with a limiting groove 612. The limiting groove 612 is opened in the middle of the limiting box 611 and faces the lower tube sleeve 4. A connecting hole 613 is provided at the bottom of the limiting groove 612.

[0046] Reference Figure 3The support feet 614 are strip plates arranged at intervals. The thickness of the support feet 614 is equal to the thickness of the groove wall of the limiting groove 612. The width of the support feet 614 is less than the length of the limiting box 611, and the length of the support feet 614 is greater than the thickness of the rack 66. One end of each of the two support feet 614 is fixed to the opposite groove walls of the limiting groove 612. The outer surface of the support feet 614 is flush with the outer wall of the limiting box 611, and the bottom surface of the support feet 614 is flush with the outer wall of the lower box surface of the limiting box 611. The other end of the support feet 614 is fixed below the edge of the lower sleeve 4.

[0047] Reference Figure 3 One side of the toothed block 62 has counterclockwise inclined teeth, and the other side is a flat surface. The toothed block 62 is adapted to and movably installed within the limiting groove 612, and the thickness of the toothed block 62 is less than the depth of the limiting groove 612. One end of the pull rod 63 is inserted into the connecting hole 613. The pull rod 63 passes through the spring 65 and is fixedly connected to the flat end of the toothed block 62. The length of the pull rod 63 is less than the depth of the limiting groove 612. A pull button 64 is fixedly connected to the end of the pull rod 63 away from the toothed block 62. The bottom diameter of the pull button 64 is larger than the diameter of the connecting hole 613, so that the pull button 64 can abut against the outside of the connecting hole 613. One end of the spring 65 is fixedly connected to the edge of the connecting hole 613, and the other end is fixedly connected to the flat surface of the toothed block 62. In its naturally extended state, the spring 65 pushes the toothed block 62 out of the limiting groove 612, so that the bottom of the pull button 64 abuts against the outside of the connecting hole 613. The length of the spring 65 in its compressed state is equal to the thickness of the tooth block 62 and the depth of the limiting groove 612.

[0048] Reference Figure 3 The rack 66 is arc-shaped, with teeth on one side that are inclined clockwise and fit with the toothed block 62, and the other side is an arc surface. The length of the rack 66 is less than the diameter of the upper sleeve 3. One section of the rack 66 is fixed to the outer wall of the upper sleeve 3 near the side wall, and the other section can mesh with the toothed block 62. When the upper sleeve 3 and the lower sleeve 4 are engaged, the rack 66 contacts the toothed block 62. The engagement between the teeth causes the toothed block 62 to compress the spring 65 and retract into the limiting groove 612, allowing the upper sleeve 3 to rotate freely clockwise. When the upper sleeve 3 rotates clockwise, the toothed block 62 locks the rack 66 in place, thereby preventing the upper sleeve 3 from separating from the lower sleeve 4 when pressure is applied in the cavity.

[0049] When testing the sealing performance of the fire-fighting pipe 1 connection, an upper sleeve 3 and a lower sleeve 4 are fitted over the outside of pipe 1 and flange 2, with flange 2 positioned within the first cavity. The rack 66 rotates clockwise and engages with the toothed block 62. The sealing rings 33 of the upper sleeve 3 and lower sleeve 4 press against each other, and the sealing strip 342 abuts against the outer wall of pipe 1, thus sealing the first and second cavities. Pressure is applied to the first cavity through the air inlet head 35. After pressurization, the inclined section of the sealing ring 33 separates from the edge of the sleeve and abuts against each other, further enhancing the sealing performance. After pressurization, the air inlet head 35 is closed to stabilize the pressure in the first cavity. The pressure gauge 41 outside the second cavity is then observed to check for a complete seal in the first cavity. If the pressure gauge 41 in the second cavity shows no change, the pressure value inside the first cavity is recorded through the pressure gauge 41 connected to the first cavity. After a certain period, the pressure gauge 41 is observed to check for changes in its value, thus verifying the sealing performance of the pipe 1 connection. After the test is completed, pull the pull button 64 outward to separate the toothed block 62 from the rack 66, thereby opening the upper tube sleeve 3 and disassembling the test device.

[0050] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A fire-fighting pipeline connection sealing test device, characterized in that: For testing pipeline (1), the end of pipeline (1) is fixedly connected to flange (2). The testing device includes upper sleeve (3), lower sleeve (4), rotating shaft (5) and fixing component (6). The upper sleeve (3) is a half-pipe with fixing notches (31) at both ends. The upper sleeve (3) is sleeved on the outside of pipeline (1). The diameter of the upper sleeve (3) is larger than the diameter of flange (2). Sealing rings (33) are fixedly connected to the side wall of the upper sleeve (3) in the length direction and the arc surface of the fixing notch (31). An air inlet head (35) is fixedly connected to the middle of the outer arc surface of the upper sleeve (3). The air inlet head (35) connects the inside and outside of the upper sleeve (3). A valve is installed on the air inlet head (35). The lower sleeve (4) has the same structure as the upper sleeve (3) and is also equipped with a sealing ring (33) inside. The upper sleeve (3) and the lower sleeve (4) are connected by the rotating shaft (5). A pressure gauge (41) is fixedly connected to the middle of the outer arc surface of the lower sleeve (4). The pressure gauge (41) connects the inside and outside of the lower sleeve (4). The fixing component (6) is fixedly connected to the side of the upper sleeve (3) and the lower sleeve (4) away from the rotating shaft (5). The fixing component (6) includes a fixing seat (61), a toothed block (62), a pull rod (63), a spring (65), and a rack (66). The fixing seat (61) is fixed to the lower tube sleeve (4). The fixing seat (61) includes a limiting box (611) and a support foot (614). The opening of the limiting box (611) faces the lower tube sleeve (4). A connecting hole (613) is provided at the bottom of the limiting box (611). One end of the support foot (614) is fixed to the two opposite box walls on the opening side of the limiting box (611), and the other end of the support foot (614) is fixed to the lower side wall of the lower tube sleeve (4). The toothed block (62) is installed inside the limiting box (611), and the pull rod (63) is inserted into the connecting hole (613). One end of the pull rod (63) passes through the spring (65) and is fixed to the plane of the toothed block (62), while the other end is located outside the limiting box (611). One end of the spring (65) is fixed to the outside of the opening of the connecting hole (613), and the other end is fixed to the plane of the toothed block (62). The naturally extended spring (65) pushes the block out of the limiting box (611). One end of the rack (66) is fixed to the outer wall of the upper sleeve (3), and the other end can mesh with the toothed block (62).

2. The fire-fighting pipeline connection sealing test device according to claim 1, characterized in that: Two limiting plates (34) are fixedly connected to the inner arc surfaces of the upper sleeve (3) and the lower sleeve (4), respectively. The limiting plates (34) are semi-circular, and the two limiting plates (34) are arranged in parallel at intervals to form the first cavity. The outer diameter of the limiting plate (34) is equal to the inner diameter of the upper sleeve (3), and the inner diameter of the limiting plate (34) is equal to the outer diameter of the pipe (1). The two ends of the limiting plate (34) are flush with the side wall of the upper sleeve (3), and the distance between the two limiting plates (34) is greater than the thickness of the flange (2).

3. The fire-fighting pipeline connection sealing test device according to claim 2, characterized in that: A sealing groove (341) is provided on the inner arc surface of the limiting plate (34). The length of the sealing groove (341) is equal to the length of the inner arc surface of the limiting plate (34), and the sealing groove (341) is open at both ends. A sealing strip (342) adapted to the sealing groove (341) is fixedly connected inside the sealing groove (341). One side of the sealing strip (342) is fixedly connected to the bottom of the sealing groove (341), and the other side is higher than the opening of the sealing groove (341).

4. The fire-fighting pipeline connection sealing test device according to claim 3, characterized in that: The limiting plate (34) is spaced from the inner edges of the upper sleeve (3) and the lower sleeve (4) to form two spaced and independent second cavities. Two pressure gauges (41) that communicate with the second cavities are fixed to the outer arc surface of the lower sleeve (4).

5. The fire-fighting pipeline connection sealing test device according to claim 1, characterized in that: The sealing ring (33) includes a rectangular sealing ring body and a protruding ridge integrally formed on one side wall of the sealing ring body. The sealing ring body is divided into an inner ring and an outer ring by the protruding ridge. The sealing ring body is completely bonded to the side wall of the upper sleeve (3).

6. A fire-fighting pipeline connection sealing test device according to claim 5, characterized in that: The inner ring of the sealing ring (33) and the side near the protruding edge are machined to form an inclined surface, and the inclined surface forms a notch with the inner wall of the upper sleeve (3).

7. A fire-fighting pipeline connection sealing test device according to claim 6, characterized in that: The upper sleeve (3) and the lower sleeve (4) are provided with mounting grooves (32) on the side walls along the length direction and on the arc surface of the fixing notch (31). The mounting grooves (32) are adapted to the protrusions of the sealing ring (33).

8. A fire-fighting pipeline connection sealing test device according to claim 1, characterized in that: The pull rod (63) is fixedly connected to a pull button (64) at the end away from the tooth block (62), and the bottom diameter of the pull button (64) is larger than the diameter of the connecting hole (613).

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