A pipe opening tool with switch function

Abstract

The present invention belongs to the technical field of pipeline construction. It solves the problem in the prior art that the main pipeline must be shut down before the branch pipeline network can be repaired. A pipeline opening tool with a switch function is provided, including an electric fusion saddle-shaped tee pipe fitting with a main pipeline and a branch pipeline. A drilling cutter that is movable and extends into the main pipeline is sealed and inserted into the sealing cap on the main pipeline. The drilling cutter is threadedly connected to the sealing cap. The drill head of the drilling cutter extends downward from the sealing cap. The cutter head has an annular protrusion protruding radially along the drilling cutter. The inner peripheral wall of the main pipeline has an annular protrusion protruding radially. The inner side of the annular protrusion can allow the drill head to pass through. The branch pipeline is located between the sealing cap and the annular protrusion. A first sealing gasket is fixed on the annular protrusion, and the first sealing gasket on the annular protrusion can form a seal with the annular protrusion to separate the upper and lower sides of the annular protrusion. The present invention has the advantage of being able to achieve the connection and disconnection of the main pipeline and the branch pipeline network through the pipeline opening tool.

Description

Technical Field

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

[0002] With the rapid development of urban construction, the number of branch lines created on existing plastic pipelines is increasing. The traditional method for creating a branch line is to first shut down the water or gas supply to the plastic pipeline, then dig out the entire plastic pipeline. The plastic pipeline is then cut at the location where the branch line is to be created, and a tee fitting (i.e., a tee joint) is installed at the cut. Finally, the branch line is connected to the tee fitting. However, water and gas outages have a wide impact and cause significant economic losses, and digging out the entire pipeline during construction is very troublesome.

[0003] In response to the shortcomings of traditional branch opening methods, some pipe opening tools have emerged in the field of pipeline construction technology that are more convenient for opening branches on plastic conveying pipelines. For example, a Chinese patent document discloses a PE gas pipeline hole opener for pressurized operation (authorization announcement number: CN203936972U), which includes a T-type wrench, the T-type wrench is connected to a sealing hole opening cap, the sealing hole opening cap is connected to a saddle-shaped bypass, the saddle-shaped bypass cooperates with the pressurized gas pipeline, the sealing hole opening cap includes a sealing inner cap and a sealing outer cap, the sealing inner cap cooperates with the T-type wrench through a positioning groove, and the sealing inner cap is threadedly connected to the sealing outer cap through a positioning key. The saddle-shaped bypass is an electric fusion bypass pipe, a connecting pipe is provided on the electric fusion bypass pipe, a vent pipe is provided on one side wall of the connecting pipe, the outer wall of the head of the connecting pipe is provided with an external thread, the lower inner wall of the sealing outer cap is provided with an internal thread, the internal thread cooperates with the external thread, a drilling tool is placed in the connecting pipe, the drilling tool is connected to the T-type wrench, the electric fusion bypass pipe cooperates with the pressurized gas pipeline through a hanger and is fixed by a fastening device.

[0004] The PE gas pipe hole opener for pressure operation has the following shortcomings during use: although the PE gas pipe hole opener for pressure operation solves the problem that the plastic gas pipe is difficult to open a hole or gas leaks during the opening process under pressure operation, when a pipeline maintenance problem occurs in the branch pipe network during subsequent use, it is still necessary to shut down the main pipe before repairing the branch pipe network, which makes the daily maintenance and repair of the branch pipe network have a wide impact and causes great economic losses. Summary of the Invention

[0005] The purpose of the present invention is to solve the above problems in the existing technology and propose a pipe opening tool with a switch function. The technical problem to be solved by the present invention is how to realize the opening and closing of the main pipeline and the branch pipeline network by using the pipe opening tool.

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

[0007] 20. The repairing kit for automotive dents, according to claim 19, wherein a bottom of the foot stand comprises a through-hole, and the two foot pieces comprise two bosses, wherein the bosses comprise a through-hole, a screw bolt, and a nut. The through-hole comprises a first end, and a second end, and a second end. The bosses comprise a through-hole, a second end, and a second end.

[0008] The present pipe hole-opening tool can realize the opening of a hole in a plastic conveying pipe under a pressurized operation state. More importantly, the present pipe hole-opening tool fixes a first sealing gasket on the annular convex portion of the cutter head, and provides a matching annular convex portion on the inner peripheral wall of the main pipe. The first sealing gasket on the annular convex portion is separated from or sealed against the annular convex portion, thereby realizing the connection or isolation of the pre-opened main pipe and the branch pipe network. In addition, the drilling cutter 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 cutter 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 pipeline switch. The structure is simple and ingenious, and multiple uses are achieved.

[0009] Specifically, the drilling process of this pipe drilling tool is as follows: during construction, the electric-fusion saddle-shaped tee pipe fitting of the pipe drilling tool with a switch function is first electro-fused connected to the pre-drilled main pipe, so that the electric-fusion saddle-shaped tee pipe fitting and the pre-drilled main pipe are connected as one, and the branch pipe of the electric-fusion saddle-shaped tee pipe fitting can be connected to the new conveying pipe. Then the construction personnel rotate the cutter rod clockwise so that the drilling cutter as a whole also rotates clockwise. At the same time, the drilling cutter moves downward relative to the main pipe of the electric-fusion saddle-shaped tee pipe fitting. When the cutter head of the drilling cutter 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 cutter rod counterclockwise to reset the drilling cutter.

[0010] The process of using this pipeline hole-opening tool as a switch: After the hole opening is completed, the whole pipeline hole-opening tool remains on the main pipeline to be pre-opened. When the branch pipeline network needs daily maintenance and repair, the maintenance personnel rotate the cutter bar clockwise, causing the drilling cutter to rotate clockwise and move downward at the same time until the first sealing pad on the cutter head of the drilling cutter forms a sealing abutment with the annular protrusion on the main pipeline. At this time, the cutter head passes through the inside of the annular protrusion and extends into the main pipeline to be pre-opened. Since the branch pipeline is located between the sealing cap and the annular protrusion, the main pipeline to be pre-opened is separated from the branch pipeline at this time, enabling the branch pipeline network to be maintained and repaired daily without stopping the water or gas supply in the main pipeline to be pre-opened and without leakage, making the daily maintenance and repair of the existing plastic conveying pipeline branch pipeline network more convenient. When the daily maintenance and repair of the branch pipeline network are completed, the maintenance personnel rotate the cutter bar counterclockwise to reset the drilling cutter, and the first sealing pad on the annular protrusion is separated from the annular protrusion. At this time, the main pipeline to be pre-opened is reconnected to the branch pipeline, and the branch pipeline network resumes gas or liquid supply.

[0011] In the above pipeline hole-opening tool with a switch function, the cutter head of the drilling cutter has an annular installation groove arranged adjacent to the annular protrusion up and down, and the inner end of the first sealing pad is embedded in the annular installation groove. The groove wall of the annular installation groove can position the first sealing pad, increasing the connection reliability between the first sealing pad and the annular protrusion of the cutter head.

[0012] In the above pipeline hole-opening tool with a switch function, the first sealing pad is fixed on the lower surface of the annular protrusion, and a second sealing pad is also fixed on the upper surface of the annular protrusion. The second sealing pad can form a sealing abutment with the sealing cap. Further increasing the sealing effect at the connection between the cutter bar of the drilling cutter and the sealing cap, preventing the pipeline from leaking during daily use.

[0013] In the above pipeline hole-opening tool with a switch function, the first sealing pad is annular and is fixedly wrapped around the outside of the annular protrusion. The cross-section of the first sealing pad is in an "L" shape, and the part of the first sealing pad fixedly wrapped on the upper surface of the annular protrusion can form a sealing abutment with the sealing cap, and the part of the first sealing pad fixedly wrapped on the lower surface of the annular protrusion can form a sealing abutment with the annular protrusion. This enables the first sealing pad to be directly sleeved on the annular protrusion of the cutter head, and at the same time, the upper surface and the lower surface of the first sealing pad can respectively form a sealing abutment with the annular protrusion and the sealing cap.

[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, both of which are cylindrical and sealed and connected. The sealing inner cap and the sealing outer cap are anti-rotationally matched. The inner wall of the sealing inner cap has an internal thread and is interference-fitted with a sealing ring. The tool rod of the drilling tool has an external thread and is connected to the internal thread of the sealing inner cap. The tool rod of the drilling tool is inserted on the inner side of the sealing ring, and the inner side wall of the sealing ring is in abutment against the outer side wall of the tool rod. The cross-sections of the outer wall of the sealing inner cap and the inner wall of the sealing outer cap can be polygons with matching shapes to prevent rotation. The drill rod of the drilling tool is threadedly connected to the sealing inner cap, which is conducive to reducing the hole opening torque when drilling. By continuously rotating the knife rod, the drilling tool as a whole can rotate relative to the sealing cap and move downward or upward (the specific downward or upward movement depends on the direction of rotating the knife rod). At the same time, the sealing inner cap can guide the up and down movement of the knife rod. The threaded connection can also prevent the knife rod of the drilling tool and the sealing inner cap from shifting after the external force is removed. At the same time, the knife rod of the drilling tool and the sealing inner cap are threadedly connected, and the inner wall of the sealing inner cap is interference-fitted with a sealing ring that abuts against the outer wall of the knife rod, so that the sealing effect of the connection between the knife rod and the sealing inner cap is better, and leakage at the connection between the two is avoided.

[0015] In the aforementioned pipe opening tool with a switch function, the outer sidewall of the sealing inner cap has a plurality of annular connecting grooves distributed along its axial direction. The annular connecting grooves protrude radially from the sealing inner cap. The inner sidewall of the sealing outer cap has a plurality of annular connecting plates distributed along its axial direction. The annular connecting plates protrude radially from the sealing outer cap and are individually embedded in the annular connecting grooves. This not only increases the reliability of the connection between the sealing outer cap and the sealing inner cap, but also creates a labyrinthine structure at the connection between the two caps, thereby preventing leakage and achieving a good sealing effect.

[0016] In the aforementioned pipe opening tool with a switch function, the top of the outer sealing cap is secured to the top of the inner sealing cap, and the bottoms of the outer sealing cap and the inner sealing cap are flush with each other. The top of the outer sealing cap is secured to the top of the inner sealing cap, further improving the reliability of the connection between the outer and inner sealing caps. Furthermore, the flushness of the bottoms of the outer sealing cap and the inner sealing cap makes it easier for the sealing cap to form a seal with the gasket on the cutter head, resulting in a better sealing effect.

[0017] In the aforementioned pipe opening tool with a switch function, the bottom of the sealing outer cap has a vertically downwardly disposed insertion groove, and the top of the main pipe 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 pipe, and at the same time, provides a good sealing effect at the connection between the sealing outer cap and the main pipe, preventing leakage at the connection between the two.

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

[0019] In the aforementioned pipe drilling tool with a switch function, the drill bit is cylindrical with a closed top, and the top of the bit is threadedly connected to the bottom of the drill rod. The top of the drill rod has a connecting hole. This ensures a secure connection between the rod and the bit while facilitating assembly and disassembly of the rod and the bit. The drill bit is cylindrical with a closed top, which facilitates drilling and the threaded connection of the bit to the guide rod. The connecting hole on the top of the drill rod allows for the installation of a handle, making the rotation of the drill even more convenient.

[0020] Compared with the existing technology, the advantages of this pipe hole opening tool with a switch function are: this pipe hole opening tool can not only realize the opening of plastic conveying pipes under pressure operation, but more importantly, this pipe hole opening tool can also be used as a pipeline switch, which can connect or disconnect the pre-opened main pipeline and branch pipeline network. It has a simple and ingenious structure and can achieve multiple uses. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the three-dimensional structure of the pipe opening tool with switch function in Example 1.

[0022] Figure 2 This is a cross-sectional view of the first sealing gasket and the annular protrusion of the pipe opening tool with a switch function in the first embodiment in a separated state.

[0023] Figure 3 This is an exploded view of the pipe opening tool with switch function in Example 1.

[0024] Figure 4 It is a schematic diagram of the three-dimensional structure of the sealing outer cap of the pipe opening tool with a switch function in Example 1.

[0025] Figure 5 It is a cross-sectional view of the first sealing gasket and the annular protrusion of the pipe opening tool with a switch function in the first embodiment in a sealed abutment state.

[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 pipe opening tool with a switch function in the second embodiment.

[0027] In the figure, 1. electric-melted saddle-shaped 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 solutions of the present invention, but the present invention is not limited to these embodiments.

[0029] Example 1

[0030] A pipe opening tool with switch function, refer to Figure 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 to a cylindrical sealing cap 2, a drilling tool 3 that is movable and extends into the main pipe 1a is sealed and inserted in the sealing cap 2, the drilling tool 3 is threadedly connected to the sealing cap 2, and the cutter head 3a of the drilling tool 3 extends downward from the sealing cap 2, and the cutter head 3a has a drilling tool along the drilling line. The hole cutter 3 has a radially protruding annular convex portion 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, and the branch pipeline 1b is located between the sealing cap 2 and the annular protrusion 1a1. 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 arranged 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 5Furthermore, 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. The second sealing gasket 5 can form a sealing abutment with the sealing cap 2.

[0033] Reference 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, both of which are cylindrical and sealed. The sealing inner cap 2a and the sealing outer cap 2b are anti-rotationally matched, and 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 polygonal shapes that match each other. The inner wall of the sealing inner cap 2a has an internal thread and is interference-fitted with a sealing ring 6. The tool rod 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 is in abutment against the outer side wall of the shank 3b; the cutter head 3a of the drilling tool 3 is in the shape of a tube with a closed upper end, so that the cutting edge of the cutter head 3a is a columnar cutting edge, and there is a shallow internal thread groove on the surface of the cutting edge, which makes the perforation efficiency high and no debris falls during the perforation process, and the top of the cutter head 3a is threadedly connected to the bottom of the shank 3b of the drilling tool 3, and the top of the shank 3b of the drilling tool 3 is provided with a connecting hole 3b1.

[0034] Reference Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 and Figure 5 More specifically, the outer sidewall of the sealing inner cap 2a has a plurality of annular connecting grooves 2a1 distributed along its axial direction. The annular connecting grooves 2a1 protrude radially from the sealing inner cap 2a. The inner sidewall of the sealing outer cap 2b has a plurality of annular connecting plates 2b1 distributed along its axial direction. The annular connecting plates 2b1 protrude radially from the sealing outer cap 2b and are individually embedded within the annular connecting grooves 2a1. This allows the sealing inner cap 2a and the sealing outer cap 2b to be made of different materials and to be integrally manufactured by injection molding.

[0035] Reference Figure 2 、 Figure 4 and Figure 5 More specifically, the bottom of the sealing outer cap 2b has a plug-in groove 2b2 vertically downwardly arranged, and the top of the main pipeline 1a is inserted into the plug-in groove 2b2 and welded to the groove wall of the plug-in groove 2b2.

[0036] In this embodiment, the upper surface of the annular protrusion 1a1 and the lower surface of the first sealing gasket 4 are preferably flat; the top of the sealing outer cap 2b is preferably 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 sealing gasket 5 is flat.

[0037] The following describes the working principle of this pipe opening tool with switch function:

[0038] 1. Drilling process of the present pipe drilling tool: During construction, the electric fusion saddle tee pipe fitting 1 of the pipe drilling tool with a switch function is first electrofused and connected to the pre-drilled main pipe (not shown in the figure), so that the electric fusion saddle tee pipe fitting 1 and the pre-drilled main pipe are connected as one, and the branch pipe 1b of the electric fusion saddle tee pipe fitting 1 can be connected to a new conveying pipe. The construction personnel can set a handle on the connecting hole 3b1 of the cutter rod 3b, and then the construction personnel rotate the handle clockwise to make the drilling cutter 3 rotate clockwise as a whole. Since the cutter rod 3b of the drilling cutter 3 is threadedly connected to the sealing cap 2, the drilling cutter 3 moves downward relative to the main pipe 1a of the electric fusion saddle tee pipe fitting 1 while the drilling cutter 3 rotates. When the cutter head 3a of the drilling cutter 3 contacts the pre-drilled main pipe, the construction personnel gradually increase the rotation force of the handle until the drilling operation of the pre-drilled main pipe is completed. After the drilling is completed, the construction personnel rotate the handle counterclockwise to reset it.

[0039] In addition, since the top of the main pipe 1a is inserted into the insertion groove 2b2 of the sealing outer cap 2b and welded to the groove wall of the insertion groove 2b2, no leakage will occur at the connection between the main pipe 1a and the sealing outer cap 2b. Similarly, the multiple annular connecting plates 2b1 on the inner wall of the sealing outer cap 2b are embedded one by one in the annular connecting grooves 2a1 on the outer wall of the sealing inner cap 2a, so that the connection between the sealing outer cap 2b and the sealing inner cap 2a forms a labyrinth-like structure, thereby preventing leakage at the connection between the sealing outer cap 2b and the sealing inner cap 2a. Similarly, the shank 3b of the drilling tool 3 is threadedly connected to the sealing inner cap 2a. In addition, a sealing ring 6 is interference-fitted on the inner wall of the sealing inner cap 2a and abuts against the outer wall of the shank 3b, so that the connection between the shank 3b and the sealing inner cap 2a is sealed and no leakage will occur, thereby forming a triple sealing structure with good sealing performance, thereby realizing the opening of a hole in the plastic conveying pipeline under pressurized operation. During the construction process, there is no need to dig out the entire pipeline, and no water or gas is stopped during the opening process, and no leakage occurs, making it more convenient to open a branch on the existing plastic conveying pipeline.

[0040] 2. Process of using this pipeline hole - opening tool as a switch: After the hole - opening is completed, the whole pipeline hole - opening tool remains on the main pipeline to be pre - opened. When daily maintenance and repair of the branch pipeline network are required, the maintenance personnel rotate the handle clockwise, causing the drilling cutter 3 to rotate clockwise and move downward simultaneously. Until the first sealing gasket 4 on the cutter head 3a of the drilling cutter 3 forms a sealing abutment with the annular protrusion 1a1 on the main pipeline 1a. At this time, the cutter head 3a passes through the inner side 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 and the branch pipeline 1b are separated at this time. At the same time, because the tool shank 3b of the drilling cutter 3 is thread - connected with the inner sealing cap 2a, the two can form self - locking after the external force is removed, preventing the drilling cutter 3 from moving upward under pressure, ensuring the separated state between the main pipeline to be pre - opened and the branch pipeline 1b. When daily maintenance and repair of the branch pipeline network are carried out, the main pipeline to be pre - opened does not stop water or gas supply and does not leak, making the daily maintenance and repair of the existing plastic pipeline branch pipeline network more convenient.

[0041] When the daily maintenance and repair of the branch pipeline network are completed, the maintenance personnel rotate the handle counter - clockwise until the second sealing gasket 5 on the cutter head 3a of the drilling cutter 3 forms a sealing abutment with the bottom of the sealing cap 2, further increasing the sealing effect at the connection between the tool shank 3b of the drilling cutter 3 and the sealing cap 2, so that the pipeline does not leak during daily use. At this time, the main pipeline to be pre - opened and the branch pipeline 1b are re - connected, and the branch pipeline network resumes gas or liquid supply.

[0042] This pipeline hole - opening tool can not only achieve hole - opening of plastic pipelines under pressure - running conditions, but more importantly, it can also be used as a pipeline switch, capable of connecting or separating the main pipeline to be pre - opened and the branch pipeline network. Its structure is simple and ingenious, achieving multiple functions with one object.

[0043] Embodiment 2

[0044] The structure and principle of this embodiment are basically the same as those of Embodiment 1. The difference is as follows: Refer to Figure 6 , the first sealing gasket 4 is annular and is coated and fixed on the outer side of the annular convex part 3a1. The cross - section of the first sealing gasket 4 is in a "匚" shape, and the part of the first sealing gasket 4 coated and fixed on the upper surface of the annular convex part 3a1 can form a sealing abutment with the sealing cap 2, and the part of the first sealing gasket 4 coated and fixed on the lower surface of the annular convex part 3a1 can form a sealing abutment with the annular protrusion 1a1. In this embodiment, it is preferred that both the upper surface and the lower surface of the first sealing gasket 4 are flat surfaces. The top of the outer sealing cap 2b is coated and fixed on the top of the inner sealing cap 2a, and the bottom of the outer sealing cap 2b and the inner sealing cap 2a are arranged flush.

[0045] The process of using this pipe hole opening tool as a switch: after the hole is opened, the pipe hole opening tool as a whole remains on the pre-opened main pipe. When the branch pipe network needs daily maintenance and repair, the maintenance personnel rotates the handle clockwise to make the drilling tool 3 rotate clockwise as a whole and move downward until a seal is formed between the lower surface of the first sealing gasket 4 on the drill head 3a of the drilling tool 3 and 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 between the sealing cap 2 and the annular protrusion 1a1, the pre-opened main pipe and the branch pipe 1b 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 pipe branch pipe network more convenient.

[0046] When the routine maintenance and repair of the branch pipe network is completed, the maintenance personnel turn the handle counterclockwise until a seal is formed between the upper surface of the first sealing gasket 4 on the drill head 3a of the drilling tool 3 and 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 pipeline network resumes ventilation or liquid flow.

[0047] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope of the appended claims.

Claims

1. A pipe opening tool with a switch function, comprising an electrofusion saddle-shaped tee pipe fitting (1), wherein the electrofusion saddle-shaped tee pipe fitting (1) comprises a main pipe (1a) arranged vertically and a branch pipe (1b) integrally connected to the main pipe (1a) and arranged horizontally, wherein a cylindrical sealing cap (2) is connected to the main pipe (1a), and a drilling knife (3) that is movable and extends into the main pipe (1a) is sealed and inserted in the sealing cap (2), characterized in that: The drilling tool (3) is threadedly connected to the sealing cap (2). The cutting head (3a) of the drilling tool (3) extends downward out of the sealing cap (2). The sealing cap (2) includes a sealing inner cap (2a) and a sealing outer cap (2b) that are both cylindrical and are hermetically connected. The sealing inner cap (2a) and the sealing outer cap (2b) are anti-rotationally engaged with each other. A plurality of annular connecting grooves (2a1) are provided on the outer side wall of the sealing inner cap (2a) and are distributed along its axial direction. The annular connecting grooves (2a1) protrude radially from the sealing inner cap (2a). A plurality of annular connecting plates (2b1) are provided on the inner side wall of the sealing outer cap (2b) and are distributed along its axial direction. The annular connecting plates (2b1) protrude radially from the sealing outer cap (2b), and the annular connecting plates (2b1) are respectively fitted into the annular connecting grooves (2a1). An annular protrusion (3a1) that protrudes radially from the drilling tool (3) is provided on the cutting head (3a). An annular protrusion (1a1) that protrudes radially is provided on the inner peripheral wall of the main pipeline (1a). The inner side of the annular protrusion (1a1) allows the cutting 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 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隔断 the upper and lower sides of the annular protrusion (1a1).

2. A pipe opening tool with a switch function according to claim 1, characterized in that: An annular mounting groove (3a2) that is adjacent to the annular protrusion (3a1) above and below is provided on the cutting head (3a) of the drilling tool (3). The inner end of the first sealing gasket (4) is fitted into the annular mounting groove (3a2).

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

4. The pipe opening tool with switch function according to claim 1, characterized in that: The first sealing gasket (4) is annular and is wrapped and fixed on the outside of the annular protrusion (3a1). The cross-section of the first sealing gasket (4) is in an "L" shape. The part of the first sealing gasket (4) that is wrapped and fixed on the upper surface of the annular protrusion (3a1) can form a sealing abutment with the sealing cap (2). The part of the first sealing gasket (4) that is wrapped and fixed on the lower surface of the annular protrusion (3a1) can form a sealing abutment with the annular protrusion (1a1).

5. A pipe opening tool with a switch function according to claim 1, 2, 3 or 4, characterized in that: Internal threads are provided on the inner wall of the sealing inner cap (2a), and a sealing ring (6) is press-fitted and installed. External threads are provided on the tool shank (3b) of the drilling tool (3), and the tool shank (3b) of the drilling tool (3) 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 sealing ring (6), and the inner side wall of the sealing ring (6) abuts against the outer side wall of the tool shank (3b).

6. The pipe opening tool with switch function according to claim 5, 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 arranged flush with each other.

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

8. A pipe opening tool with a switch function according to claim 1, 2, 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 planes.

9. A pipe opening tool with a switch function according to claim 1, 2, 3 or 4, characterized in that: The cutter head (3a) of the drilling tool (3) is in the shape of a tube with a closed upper end, and the top of the cutter head (3a) is threadedly connected to the bottom of the drilling tool (3) shank (3b), and the top of the drilling tool (3) shank (3b) has a connecting hole (3b1).

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