Reusable pressing tool for clamping and pressing pipeline

Abstract

The utility model belongs to the technical field of metro station water supply and drainage pipeline pressing, and particularly relates to a reusable pressing tool for a clamping and pressing pipeline. Comprising an automatic exhaust device, an exhaust end shut-off valve and an expansion plug connector which are sequentially connected in series through a pipeline. A tee joint is connected between the exhaust end shut-off valve and the expansion plug connector, a transverse connector of the tee joint is connected with a first port of a drainage ball valve, and a second port of the drainage ball valve is used for being connected with a supercharging device. The expansion plug connector is used for being inserted into a to-be-pressed pipeline. According to the reusable pressing tool for clamping and pressing the pipeline, the technical problems that in the prior art, a thin-wall stainless steel pipeline connected in a clamping and pressing mode wastes pipe fittings and is low in efficiency are solved, the expansion plug connector can be matched with a pipeline without a special connector, the expansion plug connector is designed to be replaceable through a rubber plug, and the utilization rate of the expansion plug connector is improved. The single tool can adapt to pipelines with different pipe diameters, only the fixing boss needs to be detached when the rubber plug is replaced, the whole tool does not need to be replaced, and the equipment investment cost is reduced.

Description

Technical Field

[0001] This utility model belongs to the field of pressure testing technology for water supply and drainage pipelines in subway stations, specifically relating to a reusable pressure testing tool for pressurizing pipelines. Background Technology

[0002] Pipes connected by press-fit connections are typically non-removable. Pressure testing can only be performed by press-fitting a cap or an internal threaded fitting; otherwise, pressure testing must be done through threaded or flanged valves on the pipeline. Furthermore, if the pressure testing section lacks an air release valve, air cannot be released. To address these issues, previous construction methods often involved press-fitting a cap and then cutting it off. While convenient, this method wastes pipe materials and fittings, can affect the measurement of pipe spacing, and adds an extra press-fitting and cutting step. Utility Model Content

[0003] One object of this invention is to solve at least the problems described above and to provide at least the advantages that will be explained later.

[0004] This utility model provides the following technical solution: a reusable pressurizing tool for pressurized pipes, comprising an automatic venting device, an venting shut-off valve, and an expansion plug connector connected in series through a pipe; a tee is connected between the venting shut-off valve and the expansion plug connector, the lateral interface of the tee is connected to the first port of a drain ball valve, and the second port of the drain ball valve is used to connect a pressurizing device; the expansion plug connector is used to be inserted into the pipe to be pressurized.

[0005] Furthermore, the expansion joint includes a central tube, a rubber plug, a fixed boss, and a movable boss. The rubber plug is a frustum with a through hole in its center. The rubber plug is fitted onto the central tube through the through hole, with the small end of the rubber plug in front and the large end in the back. The fixed boss and the movable boss are connected to the central tube at both ends of the rubber plug, respectively. The movable boss can move axially along the central tube and be fixed at the target position. The movable boss moves closer to the fixed boss, causing pressure to be applied to both ends of the rubber plug, thus expanding the outer diameter of the rubber plug and tightening the through hole.

[0006] Furthermore, the central tube is engraved with external threads, and the threaded hole of the movable boss engages with the central tube.

[0007] Furthermore, the expansion plug is connected to the tee via a right-angle elbow, and a chain is connected to the vertical pipe where the tee is located. The chain is used to bind and connect the tee to the pipe to be pressurized.

[0008] Furthermore, it also includes a pull plate, which is fitted onto the vertical pipe through a central mounting hole, with a chain connected to each of the connecting holes on both sides of the mounting hole.

[0009] Furthermore, the stopper is a pressure-resistant silicone stopper.

[0010] Compared with the prior art, the advantages of this utility model are:

[0011] This utility model provides a reusable pressurization tool for pressurized pipes, which improves the technical problems of waste of pipe fittings and low efficiency in pressurizing thin-walled stainless steel pipes with pressurization connection in the prior art. The expansion plug joint can be adapted to pipes without special interfaces. The expansion plug joint has a replaceable rubber plug design, which enables a single tool to adapt to pipes of different diameters. When replacing the rubber plug, only the fixing boss needs to be removed, without replacing the entire tool, thus reducing equipment investment costs. Attached Figure Description

[0012] Figure 1 A schematic diagram of a reusable pressure-pressurizing tool for pressurizing pipes;

[0013] Figure 2 This is a schematic diagram of an expansion joint.

[0014] In the diagram: 1-Automatic exhaust device; 2-Exhaust end shut-off valve; 3-Tee; 4-Rubber plug; 5-Fixed boss; 6-Drain ball valve; 7-Modible boss; 8-Center pipe; 9-Right angle elbow; 10-Chain; 11-Pull plate. Detailed Implementation

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] like Figure 1 As shown: A reusable pressurization tool for pressurized pipes includes an automatic venting device 1, an venting shut-off valve 2, and an expansion plug connector connected in series via a pipe; a tee 3 is connected between the venting shut-off valve 2 and the expansion plug connector, the lateral interface of the tee 3 is connected to the first port of a drain ball valve 6, and the second port of the drain ball valve 6 is used to connect a pressurizing device; the expansion plug connector is used to be inserted into the pipe to be pressurized.

[0017] like Figure 2 As shown: The expansion plug connector includes a central tube 8, a rubber plug 4, a fixed boss 5, and a movable boss 7. The rubber plug 4 is a pressure-resistant silicone plug; the rubber plug 4 is a frustum, and a through hole is opened in the center of the rubber plug 4. The rubber plug 4 is fitted onto the central tube 8 through the through hole, with the small end of the rubber plug 4 in front and the large end in the back. The fixed boss 5 and the movable boss 7 are respectively connected to the central tube 8 at both ends of the rubber plug 4. The movable boss 7 can move along the axial direction of the central tube 8 and be fixed at the target position. The movable boss 7 moves closer to the fixed boss 5 to compress both ends of the rubber plug 4, causing the outer diameter of the rubber plug 4 to expand and the through hole to tighten. The through hole in the center of the rubber plug 4 clamps the central tube 8, and the outer wall of the rubber plug 4 supports the pipe to be pressurized.

[0018] The central tube 8 is engraved with external threads, and the threaded hole of the movable boss 7 engages with the central tube 8. The outer contour of the movable boss 7 is hexagonal, which facilitates the application of force with a wrench. The fixed boss 5 is a detachable structure. The fixed boss 5 also engages with the central tube 8 through a threaded hole. When the fixed boss 5 is removed, the rubber plug 4 can be replaced to adapt to pipes with different inner diameters.

[0019] The expansion joint is connected to the tee 3 via a right-angle elbow 9. A chain 10 is connected to the vertical pipe where the tee 3 is located. The chain 10 is used to bind and connect with the pipe to be pressurized to prevent the equipment from bursting out due to overpressure.

[0020] It also includes a pull plate 11, which is fitted onto the vertical pipe through the central mounting hole, and a chain 10 is connected to each of the connecting holes on both sides of the mounting hole.

[0021] When using a reusable pressure testing tool to pressurize a pipe, insert the expansion plug connector into the pipe to be pressurized until the rubber plug 4 is completely submerged. Use a wrench to turn the movable boss 7 to compress the rubber plug 4 until its outer diameter expands, pushing against the inside of the pipe and making it impossible to pull out. Install the chain 10 on the device onto the support of the pipe to be pressurized. Connect the pressure pump to the drain ball valve 6 and begin pressurizing. Open the exhaust shut-off valve 2 to accelerate the venting of gas from the pipe. After the exhaust valve stops beeping, it indicates that the gas has been vented. Close the exhaust shut-off valve 2 and observe the pressure gauge changes on the pressure pump. After the pressure test is complete, slowly open the drain ball valve 6. After depressurization, use a wrench to loosen the movable boss 7 and pull out the rubber plug 4. If the size of the pipe to be pressurized is inconsistent, remove the fixed boss 5 and replace it with a rubber plug 4 of the corresponding size.

[0022] The feasibility of the reusable pressurization tool for crimped pipes in this embodiment has been verified through practice. Traditionally, on-site construction solutions typically involve crimping a pipe cap or an internal threaded connector, or pressurizing through threaded or flanged connections to valves on the pipeline. While simple and quick, this method wastes pipe fittings and materials, can affect the distance of the measuring tape, and makes it impossible to control the location of segmented pressurization. Furthermore, the lack of air release valves in the pressurized pipe segments can lead to air release problems. To solve these problems, the project team's technical personnel, combining their construction experience, developed a reusable pressurization tool for crimped pipes after discussion and experimentation. Under the same construction environment, the use of this tool can save half the preparation time for the pressurization test, reduce material and fitting waste, and significantly improve construction efficiency and the quality and aesthetics of the finished pipes. This tool has already been used in the electromechanical section 2 of Beijing Metro Line 3, achieving significant results and possessing considerable promotional value. The analysis table is as follows:

[0023] Comparison of reusable pressure-pressurizing tools using compression tubing with traditional methods (Table)

[0024]

[0025] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A reusable pressing tool for a crimped pipe, characterized by: The automatic exhaust device (1), the exhaust end shut-off valve (2) and the inflation plug joint are connected in sequence through a pipeline; a tee (3) is connected between the exhaust end shut-off valve (2) and the inflation plug joint, a transverse interface of the tee (3) is connected with a first port of the drain ball valve (6), a second port of the drain ball valve (6) is used for connecting a pressure boosting device; and the inflation plug joint is used for being inserted into a pipeline to be pressed.

2. The reusable pressing tool for pressing a carded tube according to claim 1, wherein: The inflation plug joint comprises a center pipe (8), a rubber plug (4), a fixed boss (5) and a movable boss (7), the rubber plug (4) is a circular truncated cone, a through hole is formed in the center of the rubber plug (4), the rubber plug (4) is sleeved on the center pipe (8) through the through hole, the small end of the rubber plug (4) is in front and the large end is in back, the fixed boss (5) and the movable boss (7) are connected with the center pipe (8) at two ends of the rubber plug (4) respectively, the movable boss (7) can move axially along the center pipe (8) and is fixed at a target position, the movable boss (7) is close to the fixed boss (5) to press two ends of the rubber plug (4), the outer diameter of the rubber plug (4) is expanded and the through hole is tightened.

3. The reusable pressing tool for pressing a carded tube according to claim 2, characterized in that: The center pipe (8) is engraved with external threads, and a threaded hole of the movable boss (7) is screwed with the center pipe (8).

4. The reusable pressing tool for pressing a carded tube according to any one of claims 1 to 3, characterized in that: The inflation plug joint is connected with the tee (3) through an elbow (9), chains (10) are connected on a vertical pipeline where the tee (3) is located, and the chains (10) are used for being connected with a pipeline to be pressed.

5. The reusable pressing tool for pressing a carded tube according to claim 4, wherein: A pull plate (11) is further provided, the pull plate (11) is sleeved on the vertical pipeline through an installation hole in the middle, and a connecting hole on each side of the installation hole is connected with a chain (10).

6. The reusable pressing tool of claim 2, wherein: The rubber plug (4) is a pressure-resistant silica gel plug.

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