A pipe water pressure test plugging device

Abstract

This invention relates to a pipe pressure testing and plugging device, belonging to the field of pipe plugging technology. It includes a plugging seat, an automatic fixing mechanism, a positioning and tightening mechanism, and a power supply box. The automatic fixing mechanism is mounted on the plugging seat and includes a fixing frame, an arc welding assembly, and a rotation drive assembly. The rotation drive assembly is connected to and can drive the arc welding assembly to rotate, allowing the arc welding assembly to be fixed or separated from the pipe to be plugged. The positioning and tightening mechanism is located inside the plugging seat, and the power supply box is located outside it. This plugging device can pre-position and tighten the plugging seat to ensure its sealing performance before automatically and securely welding it to the pipe end. This achieves convenient and stable installation of the plugging seat without the need for manual labor or any auxiliary components. Furthermore, disassembly does not require cutting the weld joint, preventing damage to the pipe. It automatically and quickly disassembles the plugging seat, making it very convenient to use.

Description

Technical Field

[0001] This invention relates to the field of pipeline plugging technology, and more particularly to a pipeline water pressure testing and plugging device. Background Technology

[0002] Pipelines are tools for transporting gases or liquids over long distances. They are typically composed of the pipe body, valves, and connectors, and include low-pressure pipelines, high-pressure pipelines, and vacuum pipelines. They are widely used in water supply and drainage, heating, or gas supply.

[0003] As one of the most widely used basic components, pipelines must undergo a water pressure test before they are manufactured and installed. This test verifies the quality of the pipe wall, the strength of the joints, and the airtightness of the entire pipeline. During the test, a specialized water pressure testing machine is used to pressurize the pipeline. One end of the pipeline is sealed inside the water pressure machine, and the other end is mechanically sealed. Water pressure is output into the pipeline through the water pressure machine and held statically for a period of time under certain pressure conditions to verify the quality and service condition of the pipeline.

[0004] Currently, there are various mechanical sealing methods for pipe ports. For example, installing plugs via flanges requires disassembling and assembling multiple sets of bolts and nuts, which is cumbersome and increases testing time. There are also many other structures for positioning and installing plugs. For instance, Chinese Patent Publication No. CN115111458A discloses a pipe sealing device with adjustable pipe diameter for pipe hydrostatic testing, including: a large water pipe sample, an installation cylinder, a small water pipe sample, a first installation ring, and a hydraulic rod. The large water pipe sample is placed on the ground. The installation cylinder is installed on the left side of the large water pipe sample, and the longitudinal section length of the left side of the installation cylinder is smaller than the longitudinal section length of the right side. The small water pipe sample is installed inside the inner elastic rubber diaphragm. A support mechanism is provided on the outside of the installation cylinder, including a support connecting rod, a first adjusting rod, and an insert rod. A sealing mechanism is provided on the right side of the installation cylinder, including an inner elastic rubber diaphragm, a sponge cylinder, and an outer elastic rubber diaphragm. This adjustable-diameter pipe sealing device for pipeline hydrostatic testing provides effective support to prevent the device from falling, can be inserted into the soil to improve stability, effectively seals to prevent gaps, and can seal pipes of different sizes. Its adjustable diameter offers high flexibility.

[0005] While the aforementioned patent documents demonstrate a good seal for the plug installation and offer greater ease of installation than bolts and nuts, the plug installation is not sufficiently stable and has limited water pressure resistance, posing a risk of plug detachment during pipeline pressure testing. Furthermore, neither of these two plug installation methods provides convenient and secure installation, sealing, or removal of the plug.

[0006] Therefore, in order to address the above-mentioned technical problems, it is necessary to provide a pipeline water pressure test sealing device. Summary of the Invention

[0007] (a) Technical problems to be solved

[0008] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a pipeline water pressure test plugging device, which solves the technical problem of not being able to easily achieve the stable and sealed installation and disassembly of the plug.

[0009] (II) Technical Solution

[0010] To achieve the above objectives, the main technical solutions adopted by the present invention include:

[0011] A pipe pressure testing and plugging device includes a plugging seat, an automatic fixing mechanism, a positioning and tightening mechanism, and a power supply box. The plugging seat is used to plug and fix the flange port of the tail end of the pipe section to be plugged. The automatic fixing mechanism is mounted on the plugging seat and includes a fixing frame, an arc welding assembly, and a rotary drive assembly. The fixing frame is fixedly mounted on the plugging seat, and the arc welding assembly and the rotary drive assembly are connected to the fixing frame. The rotary drive assembly is connected to and can drive the arc welding assembly to rotate, allowing the arc welding assembly to be welded and fixed to or separated from the pipe to be plugged. The positioning and tightening mechanism is located inside the plugging seat and is used to tighten the plugging seat tightly against the flange port of the pipe to be tested. The power supply box is located outside the plugging seat and provides power and air supply to the automatic fixing mechanism and the positioning and tightening mechanism.

[0012] In one or more embodiments of the present invention, preferably, the fixing frame is fixedly mounted on the sealing seat, and the opening of the fixing frame is provided with a rotating shaft. The arc welding assembly is fixedly connected to the rotating shaft. The arc welding assembly includes an electric welding clamp, a welding cable and an arc welding rod. One end of the electric welding clamp is fixedly connected to the rotating shaft, and the other end of the electric welding clamp clamps and fixes the arc welding rod. The electric welding clamp and the power supply box are electrically connected through the welding cable.

[0013] In one or more embodiments of the present invention, preferably, the welding clamp is fitted with a protective handle with good insulation and heat insulation performance, the welding clamp is provided with an electrical interface for stable connection with the welding cable, the welding cable between the welding clamp and the power supply box is a positive cable, and a general negative cable is also connected between the pipe to be blocked and the power supply box, so that a stable burning arc can be established between the arc welding rod and the pipe to be blocked, so that the arc welding rod can melt after being energized and contacting the pipe to be blocked, and then the power supply is disconnected, and the arc welding rod is welded and fixed on the pipe to be blocked.

[0014] In one or more embodiments of the present invention, preferably, the rotary drive assembly is a rotary cylinder, which is fixedly connected to one end of the fixed frame, and the power output shaft on the rotary cylinder is fixedly connected to the rotating shaft through a coupling.

[0015] In one or more embodiments of the present invention, preferably, the rotary drive assembly is a telescopic cylinder, the outer cylinder of the telescopic cylinder is movably hinged to one side of the extended fixed frame, the telescopic inner rod of the telescopic cylinder is movably hinged to the arc welding assembly, and the telescopic cylinder, the arc welding assembly and the fixed frame form a triangular structure. When the telescopic cylinder extends or retracts, it pushes the arc welding assembly, causing the arc welding assembly to rotate around the pivot, thereby realizing the rotational swing of the arc welding assembly.

[0016] In one or more embodiments of the present invention, preferably, the automatic fixing mechanism is provided in three, four or more groups, and the three, four or more groups of automatic fixing mechanisms are symmetrically arranged with the center of the sealing seat as the center.

[0017] In one or more embodiments of the present invention, preferably, the positioning and tensioning mechanism includes a movable support arm, a walking tensioning component, and a push-pull component. One end of the movable support arm is movably hinged to one side of the sealing seat, and the walking tensioning component is disposed at the other end of the movable support arm. The push-pull component is fixedly disposed in the center of the sealing seat, and the push-pull component can push and pull to drive the walking tensioning component on the movable support arm to expand and contract simultaneously.

[0018] In one or more embodiments of the present invention, preferably, the walking tensioning component is a motor drive wheel, which is installed in a groove at the top of the movable support arm and electrically connected to the power supply box, and can rotate normally after being powered on; a pressure sensor is provided on the motor drive wheel; the pressure sensor is electrically connected to the power supply box;

[0019] Preferably, the outer surface of the motor drive wheel is provided with a rubber pad with anti-slip texture.

[0020] In one or more embodiments of the present invention, preferably, the push-pull assembly includes an electric push rod, a push-pull block and a support link. The electric push rod is fixedly connected to the sealing seat, the push-pull block is fixedly connected to the top end of the telescopic rod of the electric push rod, one end of the support link is movably hinged to the movable support arm, the other end of the support link is movably hinged to the push-pull block, and multiple sets of support links and movable support arms are provided correspondingly.

[0021] The movable support arm, support link, and electric push rod together form an umbrella-shaped frame structure. When the electric push rod drives the telescopic inner rod to extend or retract, the telescopic inner rod pushes and pulls the push-pull block horizontally. The push-pull block pushes and pulls the corresponding connected movable support arm through the support link, so that the movable support arm can expand outward and retract inward at the same time. This, in turn, drives the walking tensioning component on the movable support arm to expand and retract at the same time.

[0022] More preferably, the push-pull block is cylindrical, and the horizontal center line of the cylinder coincides with the horizontal center line of the electric push rod. The circumferential curved surface on the push-pull block is provided with a groove, one end of the support link is movably hinged inside the groove, a "C"-shaped connecting frame is fixed on the movable support arm, and the other end of the support link is movably hinged on the "C"-shaped connecting frame.

[0023] During installation, a sealing ring is also provided between the flange and the sealing seat. The sealing ring is an "O"-shaped rubber sealing ring.

[0024] Preferably, in the pipeline water pressure test sealing device described above, the power supply box is equipped with a control panel, the control panel is fixedly connected to a controller for controlling the power supply and air supply, the control panel is equipped with a display screen and control buttons, the display screen and control buttons are electrically connected and configured, and the display screen and control buttons are electrically connected to the controller through wires.

[0025] (III) Beneficial Effects

[0026] The beneficial effects of this invention are:

[0027] This invention provides a pipe water pressure test plugging device, which can pre-position and tighten the plug seat to ensure the sealing performance of the plug seat, and then automatically and firmly weld and fix the plug seat to the pipe port, thereby realizing convenient and stable installation of the plug seat without the need for manpower or any auxiliary components. Moreover, no cutting is required at the welded joint during disassembly, and no damage is caused to the pipe. Thus, the quick installation and disassembly of the plug seat or plug can be completed automatically, which is very convenient to use.

[0028] The present invention provides a pipeline water pressure test sealing device, which can tighten the sealing seat from the inside by setting and tightening mechanism, and fix it to the outside by welding with an electric arc welding assembly, which can effectively prevent the sealing seat from falling off during use. After use, the pipeline can be sealed again by replacing the new electric arc welding rod. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of a preferred pipeline water pressure testing and sealing device of the present invention;

[0030] Figure 2 This is a front view of a preferred pipeline water pressure testing and sealing device of the present invention;

[0031] Figure 3 This is a front view of the sealing seat of a preferred pipeline water pressure testing sealing device of the present invention;

[0032] Figure 4 This is a schematic diagram of the sealing seat structure of a preferred pipeline water pressure testing sealing device of the present invention;

[0033] Figure 5This is a partial schematic diagram of the arc welding assembly of a preferred pipeline water pressure testing and sealing device of the present invention;

[0034] Figure 6 This is a side view of a preferred pipeline water pressure testing and sealing device of the present invention;

[0035] Figure 7 This invention provides a preferred pipeline water pressure testing and sealing device. Figure 4 Enlarged view of point A in the middle;

[0036] Figure 8 This is a schematic diagram of the power supply box structure of a preferred pipeline water pressure testing and sealing device of the present invention.

[0037] [Explanation of Labels in the Attached Image]

[0038] 100: Pipe to be plugged; 101: Flange; 102: Sealing ring; 200: Plug seat; 300: Power supply box; 301: Control panel; 302: Display screen; 303: Control buttons; 400: Fixture; 401: Welding clamp; 402: Welding cable; 403: Arc welding rod; 404: Rotary cylinder; 500: Movable support arm; 501: Motor drive wheel; 502: Support rod; 503: Electric push rod; 504: Push-pull block. Detailed Implementation

[0039] To better explain and facilitate understanding of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0040] To better understand the above technical solutions, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present invention can be understood more clearly and thoroughly, and that the scope of the present invention can be fully conveyed to those skilled in the art.

[0041] Example 1

[0042] A pipe pressure testing and plugging device includes a plugging seat, an automatic fixing mechanism, a positioning and tightening mechanism, and a power supply box. The plugging seat is used to plug and fix the flange port of the tail end of the pipe section to be plugged. The plugging seat is equipped with an automatic fixing mechanism, which includes a fixing frame, an arc welding assembly, and a rotary drive assembly. The fixing frame is fixedly mounted on the plugging seat, and the rotary drive assembly is fixedly connected to the fixing frame. The rotary drive assembly can drive the arc welding assembly to rotate, and the arc welding assembly can be welded and fixed to or separated from the pipe to be plugged. The inner side of the plugging seat is equipped with a positioning and tightening mechanism, which is used to tighten the plugging seat tightly against the flange port of the pipe to be tested. The outer side of the plugging seat is equipped with a power supply box, which provides power and air supply to the automatic fixing mechanism and the positioning and tightening mechanism.

[0043] This invention features an automatic fixing mechanism and a positioning and tightening mechanism installed on the sealing seat. The positioning and tightening mechanism enables precise pre-positioning of the sealing seat during installation, eliminating the need for manual labor or other external assistance. The automatic fixing mechanism automatically completes welding and fixing after the sealing seat is precisely positioned, making the entire process seamless.

[0044] Specifically, such as Figure 1 and 2 As shown, the pipe to be blocked 100 is the tail end section of the pipe to be tested, and a flange 101 is fixed on the pipe to be blocked; a sealing ring 102 is fixedly connected to one side of the flange 101, and the sealing ring 102 is an "O"-shaped rubber sealing ring. The sealing ring 102 is located between the flange 101 and the sealing seat 200, which can ensure the sealing between the flange 101 and the sealing seat 200 and ensure the sealed installation of the sealing seat 200. A power supply box 300 is fixedly installed on the outer side of the sealing seat 200 corresponding to the flange 101, and a positioning and tightening mechanism is fixedly installed on the inner side of the sealing seat 200, that is, the side connected to the flange 101. An automatic fixing mechanism is fixedly connected to the sealing seat 200.

[0045] The automatic fixing mechanism includes a fixing frame 400, an arc welding assembly, and a rotary drive assembly. The fixing frame 400 is fixed on the sealing seat 200, and the rotary drive assembly is fixedly connected to the fixing frame 400. The rotary drive assembly can drive the arc welding assembly to rotate; the arc welding assembly is also connected to the fixing frame 400.

[0046] Specifically, such as Figure 3As shown, four sets of fixing frames 400 are welded and fixed on the circumferential curved surface of the sealing seat 200. The front end of the fixing frame 400 is designed to be openable, and two sets of bearings are installed on it. A rotating shaft is installed between the two sets of bearings. The arc welding assembly is fixedly connected to the rotating shaft. The end of the fixing frame 400 is fixed to the sealing seat. The four sets of fixing frames 400 are evenly arranged in a circular pattern on the sealing seat, that is, symmetrically set on the sealing seat. Each set of fixing frames 400 is equipped with one set of arc welding assembly and one set of rotation drive assembly. The sealing seat 200 can be welded and fixed in four directions at the same time through the four sets of arc welding assembly. The rotation of the four sets of arc welding assembly is controlled by the four sets of rotation drive assembly respectively.

[0047] like Figure 4 As shown, the arc welding assembly includes an electric welding clamp 401, a welding cable 402, and an arc welding rod 403. One end of the electric welding clamp 401 is welded and fixed on the rotating shaft, and the arc welding rod 403 is installed on the electric welding clamp 401. The electric welding clamp 401 is electrically connected to the power supply box 300 through the welding cable 402.

[0048] like Figure 5 As shown, the welding clamp 401 is used to clamp and fix the arc welding rod 403 and conduct current to the arc welding rod 403. The welding clamp 401 is fitted with a protective handle with good insulation and heat insulation performance, and the welding clamp 401 has an electrical interface that can be stably connected to the welding cable 402.

[0049] Among them, the welding cable 402 between the welding clamp 401 and the power supply box 300 is a positive cable, and a general negative cable is also connected between the pipe to be blocked 100 and the power supply box 300, so that a stable burning arc can be established between the arc welding rod 403 and the pipe to be blocked 100, so that the arc welding rod 403 can melt after being energized and contacting the pipe to be blocked 100. After the power is turned off, the arc welding rod 403 is welded and fixed on the pipe to be blocked 100.

[0050] In addition, when it is necessary to separate the weld point between the arc welding rod 403 and the pipe to be blocked 100, a second power-on can be performed to melt the weld point between the arc welding rod 403 and the pipe to be blocked 100. The rotation drive assembly is then immediately activated to make the welding clamp 401 rotate upward around the pivot. After the weld point melts, the arc welding rod 403 is immediately separated from the pipe to be blocked 100, which makes the sealing seat 200 lose its fixing effect and thus remove it.

[0051] See Figure 5As shown, the rotary drive assembly is a rotary cylinder 404, which drives the arc welding assembly to rotate. The rotary cylinder 404 is fixedly connected to one end of the fixed frame 400. The specific model of the rotary cylinder 404 can be MSQB-30A. Two sets of bearings are mounted on the fixed frame 400, and a rotating shaft is installed between the two sets of bearings. The arc welding assembly is fixedly connected to the rotating shaft. The power output shaft of the rotary cylinder 404 is fixedly connected to the rotating shaft via a coupling. The rotation of the power output shaft of the rotary cylinder drives the rotating shaft to rotate, thereby causing the arc welding assembly to rotate.

[0052] It is worth noting that, such as Figure 1 and Figure 2 As shown, the rotary cylinder 404 drives the rotating shaft to rotate, which in turn drives the welding clamp 401 to rotate. When encountering pipes of different diameters, the rotary cylinder 404 drives the welding clamp 401 to rotate, so that the arc welding rod 403 on the welding clamp 401 can make spot contact with the surface of the pipe of different diameters, thereby completing the welding with pipes of different diameters. The arc welding rods 403 on the four sets of welding clamps 401 simultaneously make spot contact with the surface of the pipe 100 to be blocked. During welding, it is spot welding, but the four sets of arc welding rods 403 have four welding points to ensure that the sealing seat 200 can be stably fixed.

[0053] The positioning and tensioning mechanism includes a movable support arm, a walking tensioning assembly, and a push-pull assembly, such as... Figure 3 As shown, the movable support arm 500 is movably hinged to one side of the sealing seat 200. Multiple sets of movable support arms 500 are provided, symmetrically arranged around the center of the sealing seat. A travel tensioning assembly is installed at the top of the other side of the movable support arm; a push-pull assembly is fixedly located in the center of the sealing seat, capable of driving the travel tensioning assemblies on multiple sets of movable support arms to expand and contract simultaneously.

[0054] Preferably, such as Figure 3 As shown, four sets of movable support arms 500 are movably hinged on one side of the sealing seat 200. The four sets of movable support arms 500 are symmetrically arranged on the same circumference with the center of the sealing seat 200 as the center.

[0055] like Figure 7 As shown, the walking tensioning component is a motor-driven wheel 501, which is mounted on the top of the movable support arm 500. The top of the movable support arm 500 has a groove for mounting the motor-driven wheel 501, allowing it to rotate normally after being installed inside the groove.

[0056] The outer surface of the motor drive wheel 501 is bonded with a rubber pad featuring anti-slip texture. As the motor drive wheel 501 travels along the inner wall of the pipe 100 to be blocked, the anti-slip rubber pad protects the inner wall, preventing slippage and wear. Simultaneously, the movement of the motor drive wheel 501 into the pipe 100 allows for a more forceful tightening of the sealing seat 200, ensuring sufficient tension for the sealing seat 200 to adhere to the sealing ring 102 and guaranteeing a tight seal. The motor drive wheel is electrically connected to a controller in the power supply box, and its rotation or stop can be controlled by buttons on the control panel.

[0057] like Figure 3 and Figure 4 As shown, the push-pull assembly includes a support link 502, an electric push rod 503, and a push-pull block 504. The electric push rod 503 is fixedly connected to the sealing seat 200, and the push-pull block 504 is fixedly connected to the top of the electric push rod 503. Multiple sets of support links 502 are movably hinged to the push-pull block 504. One end of the support link 502 is movably hinged to the movable support arm 500, and the other end of the support link 502 is movably hinged to the push-pull block 504. Multiple sets of support links 502 and movable support arms 500 are correspondingly provided.

[0058] Specifically, such as Figure 4 and Figure 6 As shown, the electric push rod 503 is vertically installed at the center of the sealing seat 200, and the push-pull block 504 is fixedly installed at the top of the telescopic inner rod of the electric push rod 503, as shown. Figure 7 As shown, the push-pull block 504 is cylindrical, and its horizontal center line coincides with the horizontal center line of the electric push rod 503. Four sets of support rods 502 are specifically provided, and each of the four sets of support rods 502 corresponds one-to-one with a set of movable support arms 500. A groove for connecting the four sets of support rods 502 is formed on the circumferential curved surface of the push-pull block 504. One end of each support rod 502 is movably hinged inside the groove. A "C"-shaped connecting frame is welded and fixed to the movable support arm 500, and the other end of the support rod 502 is movably hinged to the "C"-shaped connecting frame.

[0059] Among them, the movable support arm 500, the support link 502 and the electric push rod 503 together form an umbrella-shaped frame structure. When the electric push rod 503 drives the telescopic inner rod to extend or retract, the telescopic inner rod will push and pull the push-pull block 504 to move horizontally. The push-pull block 504 will push and pull the four sets of movable support arms 500 at the same time through the four sets of support links 502, so that the four sets of movable support arms 500 can expand outward and retract inward at the same time.

[0060] See Figure 4 and Figure 7 As shown, the initial state of the walking tensioning mechanism entering the pipe to be blocked 100 is that the movable support arm 500 and the electric push rod 503 are parallel, and the inclination of the support link 502 between the two is small.

[0061] See Figure 3 and Figure 6 As shown, when the walking tensioning mechanism enters the pipe to be blocked 100, the telescopic inner rod of the electric push rod 503 begins to extend outward, pushing the push-pull block 504 to move horizontally. At this time, the push-pull block 504 will push one end of the movable support arm 500 through the support connecting rod 502, causing the movable support arm 500 to rotate around the hinge point with the blocking seat 200. At this time, the end of the movable support arm 500 with the motor drive wheel 501 slowly approaches the inner wall of the pipe to be blocked 100 until the motor drive wheel 501 contacts and presses against the inner wall of the pipe to be blocked 100. The motor drive wheels 501 on the four sets of movable support arms 500 can support and position the blocking seat 200.

[0062] It is worth noting that by extending the inner rod of the telescopic electric push rod 503, the support connecting rod 502 can push the movable support arm 500 to rotate within a certain angle range, thereby enabling the motor drive wheel 501 on the movable support arm 500 to contact and press against the inner wall of the pipe 100 to be blocked of different diameters, so that the sealing seat 200 can block the pipe 100 to be blocked of different diameters.

[0063] In addition, the four sets of motor-driven wheels 501 are each driven by an independent synchronous motor, enabling the motor-driven wheels 501 to rotate automatically and travel along the inner wall of the pipe to be blocked 100. As the motor-driven wheels 501 travel inward along the inner wall of the pipe to be blocked 100, they gradually pull the sealing seat 200 closer to the pipe 100 until the sealing seat 200 is tightly pressed against the sealing ring 102. Sufficient friction ensures a tight seal between the pipe to be blocked 100 and the sealing seat 200. The motor-driven wheels 501 are electrically connected to the controller of the power supply box 300 and can rotate normally after power is supplied.

[0064] The power supply box 300 is fixedly connected to the outside of the sealing base 200, such as... Figure 8As shown, the power supply box 300 provides power and air supply for the automatic fixing mechanism and the positioning and tensioning mechanism, with the air supply used to power the rotary cylinder. A control panel 301 is mounted on one side of the power supply box 300, and a controller for controlling the power and air supply is fixedly connected to the control panel 301. The control panel 301 has a display screen 302, and below the display screen 302 are control buttons 303. Specifically, the display screen 302 is a high-definition LCD screen, and the control buttons 303 are electrically connected to the controller via wires. The combination of the display screen 302 and the control buttons 303 facilitates the operation of the sealing seat 200 by relevant testing personnel.

[0065] In use, first insert the movable support arm 500 on one side of the sealing seat 200 into the pipe 100 to be blocked. Then, activate the electric push rod 503, causing the telescopic inner rod of the electric push rod 503 to extend outward, thereby pushing the push-pull block 504 to move horizontally. At this time, the push-pull block 504 will push one end of the movable support arm 500 through the support connecting rod 502, causing the movable support arm 500 to rotate around the hinge point with the sealing seat 200. At this time, the outer end of the movable support arm 500 slowly approaches the inner wall of the pipe 100 to be blocked until the motor drive wheel 501 contacts and presses against the inner wall of the pipe 100 to be blocked. The motor drive wheels 501 on the four sets of movable support arms 500 can seal the pipe. The sealing seat 200 is positioned for support. At this time, the motor drive wheel 501 is started. The motor drive wheel 501 will rotate and move on the inner wall of the pipe to be blocked 100. As the motor drive wheel 501 moves inward on the inner wall of the pipe to be blocked 100, it will gradually pull the sealing seat 200 closer to the pipe to be blocked 100 until the sealing seat 200 is tightly attached to the sealing ring 102, so that the pipe to be blocked 100 and the sealing seat 200 are sealed. The motor drive wheel 501 is equipped with a pressure sensor. After it comes into contact with the inner wall of the pipe, the pressure sensor will detect the position. The pressure sensor is connected to the controller, and the controller is connected to and controls the electric push rod, so that the electric push rod 503 stops automatically.

[0066] Next, start the rotary cylinder 404, which drives the welding clamp 401 to rotate, so that the end of the arc welding rod 403 on the welding clamp 401 contacts the outer surface of the pipe 100 to be blocked. Connect the power supply, and after the power is turned on, the part of the arc welding rod 403 that contacts the pipe 100 to be blocked will melt, thereby spot welding the arc welding rod 403 onto the pipe 100 to be blocked, and then welding and fixing the sealing seat 200. Then disconnect the power supply, and the water pressure test of the pipeline can be carried out.

[0067] After the test is completed, or when it is necessary to remove the weld joint, the welding cable 402 is energized again to melt the weld joint between the arc welding rod 403 and the pipe 100 to be blocked. The rotary cylinder 404 is then started, which drives the welding clamp 401 to rotate in the opposite direction. This causes the arc welding rod 403 to separate from the pipe 100 to be blocked immediately after the weld joint melts, thus making the sealing seat 200 lose its fixing effect. At this time, the motor drive wheel 501 can be started again to remove the motor drive wheel 501 from the inside of the pipe, thereby removing it.

[0068] The power on / off status of the welding cable, the direction selection of the rotary cylinder, the extension or retraction of the electric push rod, and the start and stop of the motor drive wheel can all be controlled by pressing the control buttons on the connected controller. The power on / off status of the welding cable, the rotation direction of the rotary cylinder shaft, the extension or retraction status of the electric push rod, and the start and stop status of the motor drive wheel can also be seen on the display screen.

[0069] The device of this invention is suitable for sealing iron pipes that need to be sealed during water pressure testing. It can pre-position and tighten the sealing seat to ensure its sealing performance, and then automatically and securely weld and fix the sealing seat to the pipe end. Only the operation of the control button is required to achieve convenient and stable installation of the sealing seat. No manual bolt and nut connection or any auxiliary components are needed. After being fixed by welding on the outside and tightened by the positioning and tightening mechanism on the inside, the sealing seat can be effectively prevented from falling off during the pipe pressure test. Moreover, no cutting is required at the welded joint during disassembly, so as not to damage the pipe. Thus, the installation and disassembly of the sealing seat are completed automatically and quickly, which is very convenient to use.

[0070] Example 2

[0071] This embodiment is based on Embodiment 1, but replaces the rotary drive component with a telescopic cylinder. The structure of the arc welding component is driven by the telescopic cylinder. Here, the length of the fixed frame 400 needs to be appropriately extended. The outer cylinder of the telescopic cylinder is movably hinged to one side of the fixed frame 400, and the telescopic inner rod of the telescopic cylinder is movably hinged to the arc welding component. The telescopic cylinder, the arc welding component, and the fixed frame 400 form a triangular structure. When the telescopic cylinder extends or retracts, it pushes the arc welding component, causing the arc welding component to rotate around the pivot, thereby realizing the rotational swing of the arc welding component. The technical effect achieved in this embodiment is the same as that in Embodiment 1.

[0072] In the description of this invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly defined.

[0073] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0074] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that they are in indirect contact through an intermediate medium. Furthermore, "above," "over," or "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," or "beneath" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0075] In this specification, the terms "one embodiment," "some embodiments," "embodiment," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. The illustrative expressions of the above terms in this specification do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0076] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make modifications, alterations, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A pipe water pressure testing and sealing device, characterized in that, It includes a sealing seat, an automatic fixing mechanism, a positioning and tightening mechanism, and a power supply box. The sealing seat is used to seal and fix the flange port of the tail end of the pipe section to be blocked. The automatic fixing mechanism is mounted on the sealing seat and includes a fixing frame, an arc welding assembly, and a rotary drive assembly. The fixing frame is fixedly mounted on the sealing seat, and the arc welding assembly and the rotary drive assembly are connected to the fixing frame. The rotary drive assembly is connected to and can drive the arc welding assembly to rotate, thereby welding and fixing or separating the arc welding assembly from the pipe to be blocked. The positioning and tightening mechanism is located inside the sealing seat and is used to tighten the sealing seat tightly against the flange port of the pipe to be tested. The power supply box is located outside the sealing seat and is used to provide power and air supply to the automatic fixing mechanism and the positioning and tightening mechanism. The fixing frame is fixedly mounted on the sealing seat. The opening of the fixing frame is provided with a rotating shaft. The arc welding assembly is fixedly connected to the rotating shaft. The arc welding assembly includes an electric welding clamp, a welding cable and an electric arc welding rod. One end of the electric welding clamp is fixedly connected to the rotating shaft, and the other end of the electric welding clamp clamps and fixes the electric arc welding rod. The electric welding clamp and the power supply box are electrically connected through the welding cable. The positioning and tensioning mechanism includes a movable support arm, a traveling tensioning assembly, and a push-pull assembly. One end of the movable support arm is movably hinged to one side of the sealing seat, and the traveling tensioning assembly is located at the other end of the movable support arm. The push-pull assembly is fixedly located in the center of the sealing seat, and the push-pull assembly can push and pull to drive the traveling tensioning assembly on the movable support arm to expand and contract simultaneously inside the pipe. A sealing ring is also provided between the flange and the sealing seat.

2. The pipeline water pressure test sealing device as described in claim 1, characterized in that, The welding clamp is fitted with a protective handle with good insulation and heat insulation properties. The welding clamp is equipped with an electrical interface for stable connection with the welding cable. The welding cable between the welding clamp and the power supply box is a positive cable. A main negative cable is also connected between the pipe to be blocked and the power supply box, so that a stable burning arc is established between the arc welding rod and the pipe to be blocked. This allows the arc welding rod to melt after contact with the pipe to be blocked when energized. After the power is turned off, the arc welding rod is welded and fixed to the pipe to be blocked.

3. The pipeline water pressure test and plugging device as described in claim 1, characterized in that, The rotary drive assembly is a rotary cylinder, which is fixedly connected to one end of the fixed frame. The power output shaft on the rotary cylinder is fixedly connected to the rotating shaft through a coupling.

4. The pipeline water pressure test sealing device as described in claim 1, characterized in that, The rotary drive component is a telescopic cylinder. The outer cylinder of the telescopic cylinder is movably hinged to one side of the extended fixed frame. The telescopic inner rod of the telescopic cylinder is movably hinged to the arc welding component. The telescopic cylinder, the arc welding component, and the fixed frame form a triangular structure. When the telescopic cylinder extends or retracts, it pushes the arc welding component, causing the arc welding component to rotate around the pivot, thereby realizing the rotational swing of the arc welding component.

5. The pipeline water pressure test sealing device as described in claim 1, characterized in that, The automatic fixing mechanism is provided in multiple sets, and the multiple sets of automatic fixing mechanisms are symmetrically arranged with the center of the sealing seat as the center.

6. The pipeline water pressure test sealing device as described in claim 1, characterized in that, The walking tensioning assembly is a motor-driven wheel, which is installed in a groove at the top of the movable support arm and electrically connected to the power supply box. It can rotate normally after being powered on. A pressure sensor is installed on the motor-driven wheel, and the pressure sensor is electrically connected to the power supply box. The outer surface of the motor drive wheel is equipped with a rubber pad with anti-slip texture.

7. The pipeline water pressure test sealing device as described in claim 1, characterized in that, The push-pull assembly includes an electric push rod, a push-pull block, and a support link. The electric push rod is fixedly connected to the sealing seat, the push-pull block is fixedly connected to the top of the telescopic rod of the electric push rod, one end of the support link is movably hinged to the movable support arm, and the other end of the support link is movably hinged to the push-pull block. Multiple sets of support links and movable support arms are provided correspondingly. The movable support arm, support link, and electric push rod together form an umbrella-shaped frame structure. When the electric push rod drives the telescopic inner rod to extend or retract, the telescopic inner rod pushes and pulls the push-pull block horizontally. The push-pull block pushes and pulls the corresponding connected movable support arm through the support link, so that the movable support arm can expand outward and retract inward at the same time. This, in turn, drives the walking tensioning component on the movable support arm to expand and retract at the same time.

8. The pipeline water pressure test sealing device as described in claim 7, characterized in that, The push-pull block is cylindrical, and the horizontal center line of the cylinder coincides with the horizontal center line of the electric push rod. The circumferential curved surface on the push-pull block has a groove. One end of the support rod is movably hinged inside the groove. A "C"-shaped connecting frame is fixed on the movable support arm, and the other end of the support rod is movably hinged on the "C"-shaped connecting frame. The power supply box is equipped with a control panel, which is fixedly connected to a controller for controlling the power and gas supply. The control panel is equipped with a display screen and control buttons, which are electrically connected and configured to work together. The display screen and control buttons are electrically connected to the controller via wires.

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