Tapping cutter for PE gas pipeline construction

Abstract

The utility model provides a trepanning cutter for PE gas pipeline construction, and belongs to the technical field of gas pipelines. The problem of how to avoid potential safety hazards in use of a gas pipeline system while ensuring convenient construction is solved. The trepanning cutter for PE gas pipeline construction comprises a cutter body and a columnar connecting body, external threads are arranged on the peripheral face of the connecting body, the cutter body and the connecting body are integrally formed in an injection molding mode, the cutter body comprises a rod-shaped drilling part which protrudes out of the end face of the connecting body, a drilling groove is formed in the drilling part, and the drilling groove is formed in the end face of the connecting body. The drilling groove is formed in the axial direction of the drilling part and penetrates through the end face of one end of the drilling part, and a tool bit arranged around a port of the drilling groove is formed on the drilling part. The trepanning cutter for PE gas pipeline construction can avoid potential safety hazards in use of a gas pipeline system while ensuring convenient construction.

Description

Technical Field

[0001] The utility model belongs to the technical field of gas pipelines and relates to a hole-opening knife used for the construction of PE gas pipelines. Background Art

[0002] The construction of living infrastructure is a necessary prerequisite for the planning of urbanization and urbanization. The laying of gas pipelines is one of the indispensable ones in living infrastructure. In order to ensure the planning and construction costs, on the basis of the normal use of the original gas pipeline system, a new gas pipeline system is built for the newly planned area, and then the two are connected to the grid. This is the current mainstream construction method. When connecting the old and new pipeline systems to the grid, in order to ensure construction safety, there are generally two construction methods. One is to close the old gas pipeline system, then open holes in the pipe fittings of the old gas pipeline system, connect the pipe fittings of the old gas pipeline system with the pipe fittings of the new gas pipeline system through a bypass pipe, and then open the old gas pipeline system. The other is to open the old gas pipeline system with a special hole opener and install a bypass pipe when the old gas pipeline system is in an open state. Relatively speaking, the latter construction is more convenient.

[0003] For example, a spiral step-type telescopic PE gas pipeline hole opener for pressure operation disclosed in a Chinese patent (application announcement number: CN104816343A) specifically includes a saddle-shaped tee body with a saddle-shaped connecting pipe formed under the body, a side connecting pipe formed on one side of the saddle-shaped tee body, an outer cap is arranged on the outer wall of the upper opening of the saddle-shaped tee body, an inner cap and a bracket are arranged on the inner wall of the upper opening of the saddle-shaped tee body, the inner cap and the upper inner wall of the bracket are threadedly matched, a positioning convex rib is formed on the lower outer wall of the bracket, and the inner wall of the saddle-shaped tee body is provided with a positioning convex rib. A positioning groove is made, and the positioning convex rib cooperates with the positioning groove. A telescopic body is arranged in the bracket. The upper part of the outer wall of the telescopic body is made with an external thread, and the inner wall is made with an internal thread. The upper external thread cooperates with the inner wall thread of the bracket. A connecting body is arranged in the telescopic body. The upper part of the outer wall of the connecting body is made with an external thread, and the upper external thread cooperates with the inner wall thread of the telescopic body. A perforating knife is arranged under the connecting body, and the perforating knife is fixed to the connecting body by bolts. A fixing frame is arranged at the lower part of the saddle-shaped connecting pipe, and the saddle-shaped connecting pipe and the fixing frame are clamped to the PE gas pipeline.

[0004] Combined with paragraph 0005 of the specification and the accompanying drawings of the reference document Figure 1 as well as Figure 2It can be seen that the spiral step-type telescopic PE gas pipeline hole opener for pressure operation is specifically to place the saddle-shaped connecting pipe of the saddle-shaped tee body on one side of the PE gas pipeline, and then place the fixing frame on the other side of the PE gas pipeline, fix the saddle-shaped connecting pipe and the fixing frame by fasteners or welding, so that the saddle-shaped connecting pipe and the fixing frame are clamped to the PE gas pipeline, and then the side connecting pipe of the saddle-shaped tee body is connected to the bypass pipe, and then the outer cap is opened, and a special tool is inserted into the connector through the inner cap, and the special tool is rotated clockwise, and the special tool drives the connector to spiral downward, and the connector is connected through The bolt drives the perforating knife to spiral downward. When the connector rotates downward to the end position of the inner thread of the telescopic body, the connector cannot move downward, but the connector drives the telescopic body. The outer thread of the telescopic body cooperates with the thread of the bracket, so that the telescopic body also moves downward in a spiral until the cutter head of the perforating knife contacts the PE gas pipeline. At this time, the special tool continues to rotate, so that the perforating knife rotates downward to form a through hole under the action of the rotational force. Finally, the special tool is rotated counterclockwise, and the special tool drives the connector and the telescopic body to return to their original positions in turn. At this time, the PE gas pipeline is convenient for the bypass pipe to be connected.

[0005] However, in the eighth line of paragraph 0008 of the specification of the reference document, it is recorded that a perforating knife is provided at the lower end of the connector, and the perforating knife is fixed to the connector by bolts. Figure 2 It is not difficult to see that the bolt and the perforator are connected by screw connection, and the lower end of the connector is clamped to ensure that the perforator is positioned at the lower end of the connector. However, in the actual processing process, while the perforator exerts a rotational force on the outer wall of the PE gas pipeline, the outer wall of the gas pipeline will also exert a reverse force on the perforator that is opposite to the rotational force. The reverse force is transmitted to the bolt through the perforator, and the bolt and the perforator may become loose. Therefore, although the connector is still moving downward, it can only push the perforator to squeeze the outer wall of the gas pipeline. Although it can also open a hole in the outer wall of the gas pipeline under the action of pressure, it often causes cracks on the gas pipeline due to uneven pressure, pressure overload and other reasons, which bury safety hazards for subsequent use. Summary of the invention

[0006] The purpose of the utility model is to solve the above problems in the existing technology and to propose a hole-opening knife for PE gas pipeline construction. The technical problem to be solved by the utility model is: how to ensure the convenience of construction while avoiding the safety hazards in the use of the gas pipeline system.

[0007] The purpose of the utility model can be achieved through the following technical solutions: a hole-opening knife for PE gas pipeline construction, comprising a knife body and a columnar connector, the outer peripheral surface of the connector is provided with an external thread, characterized in that the knife body and the connector are integrally formed by injection molding, the knife body comprises a rod-shaped drilling portion protruding from the end surface of the connector, a drilling groove is provided in the drilling portion, the drilling groove is axially provided along the drilling portion and passes through one end surface of the drilling portion, and a knife head arranged around the end of the drilling groove is formed on the drilling portion.

[0008] Combined with the comparative documents mentioned in the background technology, the present application is used in conjunction with the three-way main body and the saddle-shaped connecting pipe in the comparative documents. Compared with the comparative documents, the difference is that when the construction personnel apply force, they can drive the connector to drive the cutter body to move downward under the action of the threaded fit, so that the cutter body contacts the outer wall of the pipe fitting. As the subsequent force is continuously applied, the cutter body is pressed against the outer wall of the pipe fitting in a continuously rotating manner and moves toward the outer wall of the pipe fitting. Under this force, the cutter head of the cutter body can be processed on the outer wall of the pipe fitting to form an opening for connecting the bypass pipe, thereby achieving the advantage of convenient construction. And during the entire processing process, since the connector is directly connected and fixed to the cutter body by injection molding, when the connector rotates and moves under the cooperation of the thread, the cutter body can move and rotate together with it, so that the cutter head can fully apply the rotational force to the outer wall of the pipe fitting, and can ensure that the pipe fitting is evenly stressed when drilling holes. The cutter head of the cutter body drills holes on the outer wall of the pipe fitting in a manner of uniform force, which can effectively avoid cracks or damage on the outer wall of the pipe fitting due to drilling holes, thereby minimizing the risk of subsequent use.

[0009] In the above-mentioned hole-punching cutter for PE gas pipeline construction, the cross section of the cutter head along the axial direction of the drilling part is conical. Through this arrangement, the contact area between the cutter head and the outer wall of the pipe fitting is smaller, thereby ensuring that the pressure at the contact part between the cutter head and the outer wall of the pipe fitting is higher, thereby ensuring that the cutter body can easily punch holes on the pipe fitting, ensuring labor-saving and efficient construction.

[0010] In the above-mentioned hole-opening cutter for PE gas pipeline construction, an internal thread is provided on the inner circumference of the drilling groove near the notch. Pipe fittings made of PE material often generate a certain amount of debris when opening holes. Through the setting of the internal thread, when opening holes, the debris generated by grinding between the cutter head and the pipe fitting can enter the groove gap in the internal thread, thereby preventing the debris from falling into the pipe fitting and effectively avoiding pipeline pollution.

[0011] In the above-mentioned hole-opening knife for PE gas pipeline construction, the knife body also includes a fixing part that is columnar and integrally formed at the other end of the drilling part, and a connecting groove is provided at the end of the fixing part that is opposite to the drilling groove, and the connector has a clearance hole connected to the connecting groove. The specific shape of the connecting groove can be matched with the screwdriver in the prior art, such as: straight, cross, triangle, hexagon, etc. The connecting groove provided in the present application is a hexagonal groove. During construction, the construction personnel can use the tool to pass through the clearance hole and then insert it into the connecting groove, and then screw the tool to make the fixing part drive the connector to rotate, and the connector cooperates with the tee body in a threaded manner to achieve the effect of driving the knife body to rotate and move.

[0012] In the above-mentioned hole-opening knife for PE gas pipeline construction, an injection hole is radially opened on the fixing part, and both ends of the injection hole are set through the outer wall of the fixing part. During the injection molding process, liquid plastic can flow into the injection hole and become one with the connector after cooling, which can improve the connection firmness between the knife body and the connector. Based on this solution, multiple injection holes can be opened and arranged in a cross or side-by-side manner. As an alternative solution, several receiving grooves can also be opened on the outer wall of the fixing part along the circumferential direction, so that the liquid plastic can flow into the receiving groove and solidify.

[0013] In the above-mentioned hole punch for PE gas pipeline construction, an annular groove is axially provided on the outer wall of the fixing part, and the annular groove is located above the injection hole, thereby increasing the area of ​​the outer peripheral wall of the fixing part and ensuring the firmness of the connection between the connector and the fixing part after injection molding.

[0014] Compared with the existing technology, the hole cutter used for PE gas pipeline construction has the following advantages:

[0015] A connector with external threads is injection molded on the outer peripheral surface of the fixed part of the cutter body, and a drilling groove is provided in the drilling part of the cutter body, so that a cutter head is formed at the end of the drilling part. During processing, the cutter head can be evenly applied to the outer wall of the pipe fitting by threaded cooperation with the connector and the tee body, thereby ensuring the convenience of opening the hole and avoiding the generation of cracks on the outer wall of the pipe fitting, and effectively improving the safety during subsequent use. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of a hole-opening knife used for PE gas pipeline construction.

[0017] Figure 2 It is a cross-sectional view and a partial enlarged view of a hole-opening knife used for PE gas pipeline construction.

[0018] Figure 3 It is a schematic diagram of the structure of the knife body.

[0019] Figure 4 It is a schematic diagram of the structure of the connector.

[0020] In the figure, 1, cutter body; 11, drilling part; 111, drilling groove; 112, cutter head; 12, fixing part; 121, connecting groove; 122, injection hole; 123, annular groove; 2, connector; 21, clearance hole. DETAILED DESCRIPTION

[0021] 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.

[0022] like Figure 2-4 As shown, the hole cutter for PE gas pipeline construction comprises an annular groove 2 and a cutter body 1, wherein the cutter body 1 specifically comprises a bar-shaped drilling portion 11 and a columnar fixing portion 12 integrally formed at one end of the drilling portion 11. Figure 1 The annular groove 2 is injection molded outside the fixing portion 12 and is columnar, and an external thread is tapped on the outer peripheral wall of the annular groove 2. A hexagonal connecting groove 121 is opened at the end of the fixing portion 12 facing away from the drilling portion 11, and a clearance hole 21 arranged around the connecting groove 121 is opened at the end of the annular groove 2 facing away from the drilling portion 11.

[0023] Combination Figure 1 A drilling groove 111 is opened in the drilling portion 11, and the drilling groove 111 is set through one end of the drilling portion 11 facing away from the annular groove 2, and a cutter head 112 is formed at the end of the drilling portion 11 and arranged around the notch of the drilling groove 111. The cross-section of the cutter head 112 cut along the axial direction of the cutter body 1 is conical, and an internal thread is tapped on the inner wall at the notch of the drilling groove 111 along the circumferential direction.

[0024] like Figure 2 As shown, a plurality of injection holes 122 are radially opened in the fixing portion 12, and both ends of each injection hole 122 pass through the outer wall of the fixing portion 12. Two injection holes 122 are opened in the present application, and the two injection holes 122 are cross-arranged and interconnected.

[0025] like Figure 2 As shown, two annular grooves 123 are further provided on the outer wall of the fixing portion 12 along the circumferential direction. The two annular grooves 123 are arranged at intervals along the length direction of the fixing portion 12 , and the two annular grooves 123 are both provided above each injection hole 122 .

[0026] Processing principle: When processing, it is only necessary to place the cutter body 1 in the mold, and then the annular groove 2 is injection molded on the outer wall of the fixing portion 12. It should be emphasized here that during the injection molding process, the liquid plastic can enter the injection hole 122 due to its flow characteristics, and can be connected to the annular groove 2 after cooling and solidifying, thereby ensuring that the connection between the annular groove 2 and the cutter body 1 is more stable, and avoiding the cutter body 1 from rotating independently relative to the annular groove 2 during the operation and screwing process.

[0027] Construction principle: The operation of this application is specifically to be used in conjunction with the tee body disclosed in the comparative document, and the external thread on the outer wall of the annular groove 2 and the internal thread in the tee body are screwed together. The construction personnel use the tool to cooperate with the connecting groove 121 on the fixing part 12 to screw the cutter body 1 to realize the rotation of the annular groove 2 relative to the tee body. Under the action of the threaded cooperation, the annular groove 2 drives the cutter body 1 to move downward while maintaining rotation until the cutter head 112 of the cutter body 1 contacts the outer wall of the pipe fitting. Under the subsequent force applied, the cutter head 112 keeps rotating while continuously squeezing the outer wall of the pipe fitting, thereby grinding and forming an opening on the outer wall of the pipe fitting, and in this process, the debris generated by grinding enters the drilling groove 111 and stays in the internal thread opened therein, and then the cutter body 1 is reversely screwed by the tool, so that the annular groove 2 drives the cutter body 1 to move in the opposite direction and reset.

[0028] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0029] Although the terms such as the blade body 1, the drilling portion 11, the drilling groove 111, the blade head 112, the fixing portion 12, the connecting groove 121, the injection hole 122, the annular groove 123, the connecting body 2, the clearance hole 21 are used more frequently in this article, the possibility of using other terms is not excluded. The use of these terms is only for the purpose of more conveniently describing and explaining the essence of the utility model; interpreting them as any additional restrictions is contrary to the spirit of the utility model.

Claims

1. A hole punching knife for PE gas pipeline construction, comprising a knife body (1) and a columnar connector (2), wherein the connector (2) is provided with an external thread on its outer peripheral surface, and characterized in that: The blade body (1) and the connecting body (2) are integrally formed by injection molding, and the blade body (1) comprises a rod-shaped drilling portion (11) protruding from the end surface of the connecting body (2), a drilling groove (111) is provided in the drilling portion (11), the drilling groove (111) is provided along the axial direction of the drilling portion (11) and passes through an end surface of the drilling portion (11), and a blade head (112) is formed on the drilling portion (11) and is arranged around the end of the drilling groove (111).

2. The hole punch for PE gas pipeline construction according to claim 1, characterized in that: The cross section of the cutter head (112) cut along the axial direction of the drilling portion (11) is in a conical shape.

3. The hole punch for PE gas pipeline construction according to claim 1 or 2, characterized in that: An internal thread is provided on the inner circumferential surface of the drilling groove (111) near the groove opening.

4. The hole punch for PE gas pipeline construction according to claim 3, characterized in that: The blade body (1) further comprises a fixing portion (12) which is columnar and integrally formed at the other end of the drilling portion (11); a connecting groove (121) is provided at one end of the fixing portion (12) which is opposite to the drilling groove (111); and a clearance hole (21) which is connected to the connecting groove (121) is provided on the connecting body (2).

5. The hole punch for PE gas pipeline construction according to claim 4, characterized in that: An injection hole (122) is radially opened on the fixing portion (12), and two ends of the injection hole (122) are arranged through the outer wall of the fixing portion (12).

6. The hole punch for PE gas pipeline construction according to claim 5, characterized in that: An annular groove (123) is provided on the outer wall of the fixing portion (12) along the axial direction, and the annular groove (123) is located above the injection hole (122).

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