Pipeline tapping tool with switching function

Abstract

The invention belongs to the technical field of pipeline construction. The problem that in the prior art, a branch pipe network can be maintained only by stopping gas of a main pipeline is solved. The pipeline tapping tool with the switching function comprises an electric smelting saddle-shaped three-way pipe fitting provided with a main pipeline and a branch pipeline, a drilling cutter capable of moving and stretching into the main pipeline is inserted into a sealing cap on the main pipeline in a sealed mode, the drilling cutter is connected to the sealing cap in a threaded mode, and a cutter head of the drilling cutter downwards stretches out of the sealing cap. An annular protruding part protruding in the radial direction of the drilling cutter is arranged on the cutter head, an annular protrusion protruding in the radial direction is arranged on the inner circumferential wall of the main pipeline, the cutter head of the drilling cutter can penetrate through the inner side of the annular protrusion, the branch pipeline is located between the sealing cap and the annular protrusion, and a first sealing gasket is fixed to the annular protruding part. And the first sealing gasket on the annular convex part and the annular bulge can form sealed abutting so as to separate the upper side and the lower side of the annular bulge. The pipeline tapping tool has the advantage that connection and disconnection of a main pipeline and a branch pipe network can be achieved through the pipeline tapping tool.

Description

Technical Field

[0001] The present invention belongs to the technical field of pipeline construction and relates to a pipeline opening tool with a switching function. Background Art

[0002] With the rapid development of urban construction, the number of branch roads opened on the existing and operating plastic pipelines is also increasing continuously. The traditional method of opening branch roads is as follows: First, it is necessary to cut off the water or gas supply of the plastic conveying pipeline, and then dig out the entire plastic conveying pipeline. Next, cut the plastic conveying pipeline at the position where the branch road needs to be opened, and install a three-way pipe fitting (i.e., a three-way joint) at the break. Finally, connect the branch pipeline to the three-way pipe fitting. However, cutting off the water or gas supply has a large impact range and causes much economic loss. It is very troublesome to dig out the entire pipeline during construction.

[0003] In view of the disadvantages of the traditional method of opening branch roads, some more convenient pipeline opening tools for opening branch roads on plastic conveying pipelines have emerged in the technical field of pipeline construction. For example, a Chinese patent document discloses a pressure-operated PE gas pipeline opening tool (authorization publication number: CN203936972U), which includes a T-shaped wrench. The T-shaped wrench is connected to a sealed opening cap. The sealed opening cap is connected to a saddle bypass. The saddle bypass is matched with the pressurized gas pipeline. The sealed opening cap includes a sealed inner cap and a sealed outer cap. The sealed inner cap is matched with the T-shaped wrench through a positioning groove. The sealed inner cap is threadedly connected to the sealed outer cap through a positioning key. The saddle bypass is an electrofusion bypass pipe. A connecting pipe is arranged on the electrofusion bypass pipe. A ventilation pipe is arranged on one side wall of the connecting pipe. External threads are made on the outer wall of the head of the connecting pipe. Internal threads are made on the lower inner wall of the sealed outer cap. The internal threads are matched with the external threads. A drilling tool is placed in the connecting pipe. The drilling tool is connected to the T-shaped wrench. The electrofusion bypass pipe is matched with the pressurized gas pipeline through a hanger and fixed by a fastening device.

[0004] The pressure-operated PE gas pipeline opening tool has the following deficiencies during use: Although the pressure-operated PE gas pipeline opening tool solves the problem that it is not easy to open holes in the plastic gas pipeline under the pressurized operation state or gas leakage occurs during the hole-opening process, during subsequent use, when pipeline maintenance problems occur in the branch pipe network, it is still necessary to cut off the gas supply of the main pipeline first to carry out the maintenance of the branch pipe network, resulting in a large impact range and much economic loss caused by the daily maintenance and repair of the branch pipe network. Summary of the Invention

[0005] The object of the present invention is to propose a pipeline opening tool with a switching function in view of the above problems existing in the prior art. The technical problem to be solved by the present invention is how to realize the on-off of the main pipeline and the branch pipe network through the pipeline opening tool.

[0006] The purpose of the present invention can be achieved by the following technical solutions:

[0007] 14. The repairing tool as claimed in claim 13, wherein the cover is an insert for inserting the cover into the pipe, and the insert is connected to the pipe cap to insert the cover into the pipe cap so as to prevent the pipe from being damaged. The repairing tool as claimed in claim 13, wherein the cover is an insert for inserting the cover into the pipe cap.

[0008] The present pipe hole opening tool can realize the opening of a hole in a plastic conveying pipe under a pressurized operating state. More importantly, the present pipe hole opening tool fixes a first sealing gasket on the annular protrusion of the cutter head, and provides a matching annular protrusion on the inner circumferential wall of the main pipe. The first sealing gasket on the annular protrusion is separated or sealed against the annular protrusion, thereby realizing the connection or isolation of the pre-opened main pipe and the branch pipe network. In addition, the drilling tool is threadedly connected to the sealing cap, and the two can form a self-locking after the external force is removed, which can prevent the drilling tool from moving upward under the action of pressure and ensure the isolation state between the pre-opened main pipe and the branch pipe, so that the present pipe hole opening tool can also be used as a pipe switch. The structure is simple and ingenious, and one object can be used for multiple purposes.

[0009] Specifically, the drilling process of the pipe hole opening tool is as follows: during construction, the electric fusion saddle tee pipe fitting of the pipe hole opening tool with a switch function is first connected to the pre-drilled main pipe by electric fusion, so that the electric fusion saddle tee pipe fitting and the pre-drilled main pipe are connected as one, and the branch pipeline of the electric fusion saddle tee pipe fitting can be connected to the new conveying pipeline. Then the construction personnel rotate the knife rod clockwise so that the drilling knife as a whole also rotates clockwise. At the same time, the drilling knife moves downward relative to the main pipeline of the electric fusion saddle tee pipe fitting. When the knife head of the drilling knife contacts the pre-drilled main pipe, the construction personnel gradually increase the rotation force until the drilling operation of the pre-drilled main pipe is completed. After the drilling is completed, the construction personnel rotate the knife rod counterclockwise to reset the drilling knife.

[0010] The process of using the pipe hole opening tool as a switch: after the hole opening is completed, the pipe hole opening tool is retained as a whole on the pre-opened main pipe. When the branch pipe network needs daily maintenance and repair, the maintenance personnel rotate the tool rod clockwise to make the drilling tool as a whole rotate clockwise and move downward until the first sealing gasket on the drilling tool head forms a sealing abutment with the annular protrusion on the main pipe. At this time, the tool head passes through the inner side of the annular protrusion and extends into the pre-opened main pipe. Since the branch pipe is located between the sealing cap and the annular protrusion, the pre-opened main pipe and the branch pipe are separated at this time, so that during the daily maintenance and repair of the branch pipe network, the pre-opened main pipe does not stop water or gas, and no leakage occurs, making the daily maintenance and repair of the existing plastic conveying pipeline branch pipe network more convenient. When routine maintenance and repair of the branch pipe network is completed, the maintenance personnel rotate the cutter rod counterclockwise to reset the drilling cutter, and the first sealing gasket on the annular protrusion is separated from the annular protrusion. At this time, the pre-opened main pipeline and the branch pipe are reconnected, and the branch pipe network resumes ventilation or liquid flow.

[0011] In the above-mentioned pipe hole opening tool with switch function, the drill bit has an annular installation groove arranged adjacent to the annular protrusion, and the inner end of the first sealing gasket is embedded in the annular installation groove. The groove wall of the annular installation groove can play a positioning role for the first sealing gasket, thereby increasing the connection reliability between the first sealing gasket and the annular protrusion of the drill bit.

[0012] In the above-mentioned pipeline hole-opening tool with switch function, the first sealing gasket is fixed on the lower surface of the annular protrusion, and the second sealing gasket is also fixed on the upper surface of the annular protrusion, and the second sealing gasket can form a sealing abutment with the sealing cap, thereby further increasing the sealing effect of the connection between the drilling tool rod and the sealing cap, so that the pipeline will not leak during daily use.

[0013] In the above-mentioned pipe hole opening tool with switch function, the first sealing gasket is annular and is fixedly wrapped around the outer side of the annular protrusion, the cross section of the first sealing gasket is "匚"-shaped, and the part of the first sealing gasket wrapped around the upper surface of the annular protrusion can form a sealing abutment with the sealing cap, and the part of the first sealing gasket wrapped around the lower surface of the annular protrusion can form a sealing abutment with the annular protrusion. The first sealing gasket can be directly mounted on the annular protrusion of the cutter head, and at the same time, the upper surface and lower surface of the first sealing gasket can form a sealing abutment with the annular protrusion and the sealing cap respectively.

[0014] In the above-mentioned pipe hole-opening tool with a switch function, the sealing cap includes a sealing inner cap and a sealing outer cap which are both cylindrical and sealingly connected. The sealing inner cap and the sealing outer cap are anti-rotationally engaged with each other. The inner wall of the sealing inner cap has an internal thread and is press-fitted with a sealing ring. The tool shank of the drilling tool has an external thread and is connected to the internal thread of the sealing inner cap. The tool shank of the drilling tool is inserted inside the sealing ring, and the inner side wall of the sealing ring abuts against the outer side wall of the tool shank. The cross-sections of the outer side wall of the sealing inner cap and the inner side wall of the sealing outer cap can be polygons with mating shapes, which play a role in anti-rotationally engaging. The tool shank of the drilling tool is threadedly connected to the sealing inner cap, which is beneficial to reducing the hole-opening torque during hole opening. By continuously rotating the tool shank, the whole drilling tool can rotate relative to the sealing cap and move downward or upward at the same time (specifically, whether it moves downward or upward depends on the direction of rotating the tool shank). At the same time, the sealing inner cap can guide the up-and-down movement of the tool shank. The threaded connection can also prevent the tool shank of the drilling tool and the sealing inner cap from shifting after the external force is removed. At the same time, the tool shank of the drilling tool and the sealing inner cap are threadedly connected. Coupled with the fact that the inner wall of the sealing inner cap is press-fitted with a sealing ring that abuts against the outer side wall of the tool shank, the sealing effect at the connection between the tool shank and the sealing inner cap is better, avoiding leakage at the connection between the two.

[0015] In the above-mentioned pipe hole-opening tool with a switch function, the outer side wall of the sealing inner cap has a plurality of annular connection grooves distributed along its axial direction. The annular connection grooves protrude radially from the sealing inner cap. The inner side wall of the sealing outer cap has a plurality of annular connection plates distributed along its axial direction. The annular connection plates protrude radially from the sealing outer cap, and the annular connection plates are respectively inserted into the annular connection grooves. While increasing the connection reliability between the sealing outer cap and the sealing inner cap, a labyrinth-like structure is formed at the connection between the sealing outer cap and the sealing inner cap, so that leakage will not occur at the connection between the sealing outer cap and the sealing inner cap, and the sealing effect is good.

[0016] In the above-mentioned pipe hole-opening tool with a switch function, the top of the sealing outer cap is covered and fixed on the top of the sealing inner cap, and the bottoms of the sealing outer cap and the sealing inner cap are arranged flush with each other. The top of the sealing outer cap being covered and fixed on the top of the sealing inner cap further improves the connection reliability between the sealing outer cap and the sealing inner cap. At the same time, the bottoms of the sealing outer cap and the sealing inner cap are arranged flush with each other, making it easier for the sealing cap to form an abutting seal with the sealing pad on the tool head, and the sealing effect is better.

[0017] In the above-mentioned pipe opening tool with a switching function, the bottom of the sealing outer cap has a vertically downwardly disposed insertion groove, and the top of the main pipeline is inserted into the insertion groove and welded to the groove wall of the insertion groove. This ensures the reliability of the connection between the sealing outer cap and the main pipeline. At the same time, it makes the sealing effect at the connection between the sealing outer cap and the main pipeline good, avoiding leakage at the connection between the two.

[0018] In the above-mentioned pipe opening tool with a switching function, the upper surface of the annular protrusion and the lower surface of the first sealing gasket are both flat surfaces. This facilitates the formation of a sealed abutment between the first sealing gasket and the annular protrusion, and makes the sealing effect better after the two abut.

[0019] In the above-mentioned pipe opening tool with a switching function, the cutter head of the drilling tool is in the shape of a cylinder with a closed upper end, and the top of the cutter head is threadedly connected to the bottom of the drill rod of the drilling tool. A connection hole is provided at the top of the drill rod of the drilling tool. While ensuring the connection stability between the drill rod and the cutter head, it makes the disassembly and assembly of the drill rod and the cutter head more convenient. And the cutter head of the drilling tool is in the shape of a cylinder with a closed upper end, which is convenient for drilling and also facilitates the threaded connection between the cutter head and the guide rod. The connection hole at the top of the drill rod of the drilling tool can facilitate the setting of a handle, making the rotation operation of the drilling tool more convenient.

[0020] Compared with the prior art, the advantages of the present pipe opening tool with a switching function are as follows: This pipe opening tool can not only realize the opening of the plastic conveying pipeline under the pressurized operation state. More importantly, this pipe opening tool can also be used as a pipeline switch, capable of connecting or disconnecting the main pipeline to be pre-opened and the branch pipe network. The structure is simple and ingenious, achieving multiple functions with one object. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a perspective structural view of the present pipe opening tool with a switching function in the first embodiment.

[0022] Figure 2 is a sectional view of the present pipe opening tool with a switching function in the first embodiment in a state where the first sealing gasket and the annular protrusion are separated.

[0023] Figure 3 is an exploded view of the present pipe opening tool with a switching function in the first embodiment.

[0024] Figure 4 is a perspective structural view of the sealing outer cap of the present pipe opening tool with a switching function in the first embodiment.

[0025] Figure 5 is a sectional view of the present pipe opening tool with a switching function in the first embodiment in a state where the first sealing gasket and the annular protrusion are in sealed abutment.

[0026] Figure 6 It is a partial cross-sectional view of the sealing abutment state between the first sealing gasket and the annular protrusion of the pipeline opening tool with a switch function in the second embodiment.

[0027] In the figure, 1. electric fusion saddle tee pipe fitting; 1a. main pipe; 1a1. annular protrusion; 1b. branch pipe; 2. sealing cap; 2a. sealing inner cap; 2a1. annular connecting groove; 2b. sealing outer cap; 2b1. annular connecting plate; 2b2. plug-in groove; 3. drilling tool; 3a. tool head; 3a1. annular protrusion; 3a2. annular mounting groove; 3b. tool rod; 3b1. connecting hole; 4. first sealing gasket; 5. second sealing gasket; 6. sealing ring. DETAILED DESCRIPTION

[0028] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0029] Embodiment 1

[0030] A pipe opening tool with switch function, referring to Figures 1-5 , including an electric fusion saddle-shaped tee pipe fitting 1, the electric fusion saddle-shaped tee pipe fitting 1 includes a main pipe 1a arranged vertically and a branch pipe 1b integrally connected to the main pipe 1a and arranged horizontally, the main pipe 1a is connected with a cylindrical sealing cap 2, a drilling knife 3 which is movable and extends into the main pipe 1a is sealed and inserted in the sealing cap 2, the drilling knife 3 is threadedly connected to the sealing cap 2, the drill head 3a of the drilling knife 3 extends downward from the sealing cap 2, and the drill head 3a has a The hole cutter 3 has a radially protruding annular protrusion 3a1, and the inner peripheral wall of the main pipeline 1a has a radially protruding annular protrusion 1a1, the inner side of the annular protrusion 1a1 can allow the cutter head 3a of the drilling cutter 3 to pass through, the branch pipeline 1b is located between the sealing cap 2 and the annular protrusion 1a1, and a first sealing gasket 4 is fixed on the annular protrusion 3a1, and the first sealing gasket 4 on the annular protrusion 3a1 can form a sealing abutment with the annular protrusion 1a1 to separate the upper and lower sides of the annular protrusion 1a1.

[0031] Reference Figure 2 and Figure 5 Furthermore, the cutter head 3a of the drilling tool 3 has an annular mounting groove 3a2 disposed adjacent to the annular protrusion 3a1 above and below, and the inner end of the first sealing gasket 4 is embedded in the annular mounting groove 3a2.

[0032] Reference Figure 2 and Figure 5, Further, the first gasket 4 is fixed on the lower surface of the annular convex portion 3a1, and a second gasket 5 is also fixed on the upper surface of the annular convex portion 3a1. The second gasket 5 can form a sealing abutment with the sealing cap 2.

[0033] Referring to Figure 1 , Figure 2 , Figure 3 and Figure 5 , specifically, the sealing cap 2 includes a sealing inner cap 2a and a sealing outer cap 2b that are both cylindrical and sealed and connected. The sealing inner cap 2a and the sealing outer cap 2b are anti-rotationally fitted. Preferably, the cross-sections of the outer side wall of the sealing inner cap 2a and the inner side wall of the sealing outer cap 2b are polygons with matching shapes. The inner wall of the sealing inner cap 2a has internal threads and an O-ring 6 is press-fitted therein. The tool shank 3b of the drilling tool 3 has external threads and is connected to the internal threads of the sealing inner cap 2a. The tool shank 3b of the drilling tool 3 is inserted inside the O-ring 6, and the inner side wall of the O-ring 6 abuts against the outer side wall of the tool shank 3b; the tool tip 3a of the drilling tool 3 is in the shape of a cylinder with a closed upper end, so that the cutting edge of the tool tip 3a is a columnar cutting edge, and there is an internal thread shallow groove on the surface of the cutting edge, which makes the perforation efficiency high and there is no falling debris during the perforation process. And the top of the tool tip 3a is threadedly connected to the bottom of the tool shank 3b of the drilling tool 3, and a connection hole 3b1 is provided on the top of the tool shank 3b of the drilling tool 3.

[0034] Referring to Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 , more specifically, the outer side wall of the sealing inner cap 2a has a plurality of annular connection grooves 2a1 distributed along its axial direction. The annular connection grooves 2a1 protrude radially along the sealing inner cap 2a. The inner side wall of the sealing outer cap 2b has a plurality of annular connection plates 2b1 distributed along its axial direction. The annular connection plates 2b1 protrude radially along the sealing outer cap 2b, and the annular connection plates 2b1 are respectively fitted into the annular connection grooves 2a1. This allows the sealing inner cap 2a and the sealing outer cap 2b to be made of different materials. At the same time, the sealing inner cap 2a and the sealing outer cap 2b can be manufactured by injection molding in one piece.

[0035] Referring to Figure 2 , Figure 4 and Figure 5 , even more specifically, the bottom of the sealing outer cap 2b has a vertically downwardly disposed insertion groove 2b2. The top of the main pipeline 1a is inserted into the insertion groove 2b2 and is welded to the groove wall of the insertion groove 2b2.

[0036] In this embodiment, it is preferably that the upper surface of the annular protrusion 1a1 and the lower surface of the first gasket 4 are both flat surfaces; it is preferably that the top of the sealing outer cap 2b is covered and fixed on the top of the sealing inner cap 2a, the bottoms of the sealing outer cap 2b and the sealing inner cap 2a are arranged flush with each other, and the upper surface of the second gasket 5 is a flat surface.

[0037] The working principle of this pipeline opening tool with a switch function is described below:

[0038] 1. The opening process of this pipeline opening tool: During construction, first, the electrofusion saddle tee fitting 1 of this pipeline opening tool with a switch function is electrofusion-connected to the main pipeline to be pre-opened (not shown in the figure), so that the electrofusion saddle tee fitting 1 and the main pipeline to be pre-opened are integrated. The branch pipeline 1b of the electrofusion saddle tee fitting 1 can be connected to a new conveying pipeline. Construction workers can set a handle on the connection hole 3b1 of the tool rod 3b. Then, the construction workers rotate the handle clockwise so that the drilling tool 3 as a whole also rotates clockwise. Since the tool rod 3b of the drilling tool 3 is threadedly connected to the sealing cap 2, while the drilling tool 3 rotates, the drilling tool 3 moves downward relative to the main pipeline 1a of the electrofusion saddle tee fitting 1. When the cutting head 3a of the drilling tool 3 contacts the main pipeline to be pre-opened, the construction workers gradually increase the rotation force of the handle until the opening operation of the main pipeline to be pre-opened is completed. After the opening is completed, the construction workers rotate the handle counterclockwise to reset it.

[0039] In addition, since the top of the main pipeline 1a is inserted into the insertion slot 2b2 of the sealing outer cap 2b and is welded to the wall of the insertion slot 2b2, there will be no leakage at the connection between the main pipeline 1a and the sealing outer cap 2b; similarly, several annular connecting plates 2b1 on the inner side wall of the sealing outer cap 2b are respectively fitted into the annular connecting grooves 2a1 on the outer side wall of the sealing inner cap 2a, so that a labyrinth-like structure is formed at the connection between the sealing outer cap 2b and the sealing inner cap 2a, thus preventing leakage at the connection between the sealing outer cap 2b and the sealing inner cap 2a; similarly, the tool rod 3b of the drilling tool 3 is threadedly connected to the sealing inner cap 2a, and an O-ring 6 that abuts against the outer side wall of the tool rod 3b is press-fitted on the inner wall of the sealing inner cap 2a, so that the connection between the tool rod 3b and the sealing inner cap 2a is also a sealed connection and will not leak, thereby forming a triple sealing structure with good sealing performance, and further realizing the opening of the plastic conveying pipeline under the pressurized operation state. During the construction process, there is no need to dig out the whole pipeline, the water or gas supply does not need to be stopped during the opening process, and there is no leakage, making it more convenient to open a branch on the existing plastic conveying pipeline.

[0040] 2. The process of using the pipe hole opening tool as a switch: After the hole opening is completed, the pipe hole opening tool is retained on the pre-opened main pipe as a whole. When the branch pipe network needs daily maintenance and repair, the maintenance personnel rotate the handle clockwise to make the drilling tool 3 rotate clockwise as a whole and move downward until the first sealing gasket 4 on the drill head 3a of the drilling tool 3 forms a sealing abutment with the annular protrusion 1a1 on the main pipe 1a. At this time, the cutter head 3a passes through the inner side of the annular protrusion 1a1 and extends into the pre-opened main pipe. Since the branch pipe 1b is located on the sealing cap 2 and the annular protrusion 1a1, at this time, the pre-opening main pipeline and the branch pipeline 1b are separated, and at the same time, because the tool rod 3b of the drilling tool 3 and the sealing inner cap 2a are threadedly connected, the two can form a self-locking after the external force is removed, avoiding the drilling tool 3 from moving upward under the action of pressure, and can ensure the separation state between the pre-opening main pipeline and the branch pipeline 1b, so that during the daily maintenance and repair of the branch pipeline network, the pre-opening main pipeline does not stop water or gas, and no leakage occurs, making the daily maintenance and repair of the existing plastic conveying pipeline branch pipeline network more convenient.

[0041] When the routine maintenance and repair of the branch pipe network is completed, the maintenance personnel turn the handle counterclockwise until the second sealing gasket 5 on the drill head 3a of the drilling tool 3 forms a sealing abutment with the bottom of the sealing cap 2, further increasing the sealing effect of the connection between the drill rod 3b of the drilling tool 3 and the sealing cap 2, so that the pipeline will not leak during daily use. At this time, the pre-opened main pipeline and the branch pipeline 1b are reconnected, and the branch pipe network resumes ventilation or liquid flow.

[0042] This pipe hole opening tool can not only open holes in plastic conveying pipes under pressure, but more importantly, it can also be used as a pipe switch to connect or disconnect the pre-opened main pipe and branch pipe network. It has a simple and ingenious structure and can be used for multiple purposes.

[0043] Embodiment 2

[0044] The structure and principle of this embodiment are basically the same as those of the first embodiment, except that: Figure 6 , the first sealing gasket 4 is annular and is covered and fixed on the outer side of the annular protrusion 3a1, the cross section of the first sealing gasket 4 is "匚"-shaped, and the portion of the first sealing gasket 4 covered and fixed on the upper surface of the annular protrusion 3a1 can form a sealing abutment with the sealing cap 2, and the portion of the first sealing gasket 4 covered and fixed on the lower surface of the annular protrusion 3a1 can form a sealing abutment with the annular protrusion 1a1. In this embodiment, it is preferred that the upper and lower surfaces of the first sealing gasket 4 are both planes, the top of the sealing outer cap 2b is covered and fixed on the top of the sealing inner cap 2a, and the bottoms of the sealing outer cap 2b and the sealing inner cap 2a are arranged flush.

[0045] The process of using this pipeline hole-opening tool as a switch: After the hole opening is completed, the whole of this pipeline hole-opening tool remains on the main pipeline to be pre-opened. When routine maintenance and repair are required for the branch pipeline network, the maintenance personnel rotate the handle clockwise, causing the drilling tool 3 to rotate clockwise and move downward simultaneously until a sealed abutment is formed between the lower surface of the first gasket 4 on the cutting head 3a of the drilling tool 3 and the annular protrusion 1a1 on the main pipeline 1a. At this time, the cutting head 3a passes through the inside of the annular protrusion 1a1 and extends into the main pipeline to be pre-opened. Since the branch pipeline 1b is located between the sealing cap 2 and the annular protrusion 1a1, the main pipeline to be pre-opened is separated from the branch pipeline 1b at this time, enabling the branch pipeline network to be maintained and repaired without stopping the water or gas supply in the main pipeline to be pre-opened and without leakage occurring, making the routine maintenance and repair of the existing plastic conveying pipeline branch pipeline network more convenient.

[0046] When the routine maintenance and repair of the branch pipeline network are completed, the maintenance personnel rotate the handle counterclockwise until a sealed abutment is formed between the upper surface of the first gasket 4 on the cutting head 3a of the drilling tool 3 and the bottom of the sealing cap 2, further enhancing the sealing effect at the connection between the tool shank 3b of the drilling tool 3 and the sealing cap 2, ensuring that no leakage occurs during the daily use of the pipeline. At this time, the main pipeline to be pre-opened is reconnected to the branch pipeline 1b, and the branch pipeline network resumes gas or liquid flow.

[0047] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art of the present invention can make various modifications, supplements, or use similar methods of substitution to the described specific embodiments, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A pipeline opening tool with a switching function, comprising an electrofusion saddle tee fitting (1). The electrofusion saddle tee fitting (1) includes a main pipeline (1a) arranged vertically and a branch pipeline (1b) integrally connected to the main pipeline (1a) and arranged horizontally. A cylindrical sealing cap (2) is connected to the main pipeline (1a). A drilling tool (3) that can move and extend into the main pipeline (1a) is hermetically inserted into the sealing cap (2). It is characterized in that, The drilling tool (3) is threadedly connected to the sealing cap (2); the tool head (3a) of the drilling tool (3) extends downward from the sealing cap (2); the tool head (3a) has an annular protrusion (3a1) protruding radially along the drilling tool (3); the inner peripheral wall of the main pipeline (1a) has an annular protrusion (1a1) protruding radially; the inner side of the annular protrusion (1a1) allows the tool head (3a) of the drilling tool (3) to pass through; the branch pipeline (1b) is located between the sealing cap (2) and the annular protrusion (1a1); a first sealing gasket (4) is fixed to the annular protrusion (3a1); and the first sealing gasket (4) on the annular protrusion (3a1) can form a sealing abutment with the annular protrusion (1a1) to separate the upper and lower sides of the annular protrusion (1a1).

2. The pipe hole-opening tool with a switch function according to claim 1, characterized in that, The drill bit (3a) of the drilling tool (3) has an annular mounting groove (3a2) disposed adjacent to the annular protrusion (3a1) above and below, and the inner end of the first sealing gasket (4) is embedded in the annular mounting groove (3a2).

3. The pipe opening tool with a switching function according to claim 2, characterized in that, The first sealing gasket (4) is fixed on the lower surface of the annular protrusion (3a1), and a second sealing gasket (5) is also fixed on the upper surface of the annular protrusion (3a1), and the second sealing gasket (5) can form a sealing abutment with the sealing cap (2).

4. A pipeline hole-opening tool with a switch function according to claim 1, characterized in that, The first sealing gasket (4) is annular and is wrapped and fixed on the outer side of the annular convex portion (3a1). The cross section of the first sealing gasket (4) is in the shape of a "匚"; the portion of the first sealing gasket (4) wrapped and fixed on the upper surface of the annular convex portion (3a1) can form a sealing abutment with the sealing cap (2), and the portion of the first sealing gasket (4) wrapped and fixed on the lower surface of the annular convex portion (3a1) can form a sealing abutment with the annular protrusion (1a1).

5. A pipeline hole-opening tool with a switch function according to claim 1 or 2 or 3 or 4, characterized in that, The sealing cap (2) comprises a sealing inner cap (2a) and a sealing outer cap (2b) both of which are cylindrical and sealed. The sealing inner cap (2a) and the sealing outer cap (2b) are anti-rotationally matched. The inner wall of the sealing inner cap (2a) has an internal thread and is interference-fitted with a sealing ring (6). The shank (3b) of the drilling tool (3) has an external thread and is connected to the internal thread of the sealing inner cap (2a). The shank (3b) of the drilling tool (3) is inserted into the inner side of the sealing ring (6), and the inner side wall of the sealing ring (6) abuts against the outer side wall of the shank (3b).

6. The pipe opening tool with a switching function according to claim 5, characterized in that, The outer side wall of the sealing inner cap (2a) has a plurality of annular connecting grooves (2a1) distributed along its axial direction, and the annular connecting grooves (2a1) are protruded along the radial direction of the sealing inner cap (2a). The inner side wall of the sealing outer cap (2b) has a plurality of annular connecting plates (2b1) distributed along its axial direction, and the annular connecting plates (2b1) are protruded along the radial direction of the sealing outer cap (2b), and the annular connecting plates (2b1) are embedded one by one in the annular connecting grooves (2a1).

7. The pipe opening tool with a switching function according to claim 6, characterized in that, The top of the sealing outer cap (2b) is covered and fixed on the top of the sealing inner cap (2a), and the bottoms of the sealing outer cap (2b) and the sealing inner cap (2a) are flush with each other.

8. The pipe opening tool with a switch function according to claim 5, characterized in that, The bottom of the sealing outer cap (2b) has an insertion slot (2b2) arranged vertically downward, and the top of the main pipeline (1a) is inserted into the insertion slot (2b2) and is welded to the slot wall of the insertion slot (2b2).

9. A pipe opening tool with a switching function according to claim 1 or 2 or 3 or 4, characterized in that, The upper surface of the annular protrusion (1a1) and the lower surface of the first sealing gasket (4) are both flat surfaces.

10. A pipeline hole opening tool with a switching function according to claim 1 or 2 or 3 or 4, characterized in that, The cutter head (3a) of the drilling cutter (3) is in the shape of a cylinder with a closed upper end, and the top of the cutter head (3a) is threadedly connected to the bottom of the cutter rod (3b) of the drilling cutter (3), and a connection hole (3b1) is provided at the top of the cutter rod (3b) of the drilling cutter (3).

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