CN204299583U - The cutter of underground plastic lined piping is cut on conventional no-dig technique rig - Google Patents

Abstract

The utility model belongs to the technical field of non-excavation pipe-laying machinery, and relates to a cutting knife used for cutting underground plastic pipelines on a conventional non-excavation drilling rig. One end of the shaft is provided with a male thread, and the other end of the central shaft is provided with a female thread. Both the female thread and the male thread are arranged coaxially with the central through hole, and three blades are evenly distributed on the peripheral surface of the central shaft. A cutting angle a is formed between the blade and the axis of the central shaft, and the cutting angle a is 15°-20°. A simple, ingenious and reasonable cutting knife for cutting underground plastic pipelines on a conventional non-excavation drilling rig is provided, and the cutting operation can be conveniently and quickly performed on underground pipes to be replaced by using the cutting knife.

Description

Knives for cutting underground plastic pipelines on conventional trenchless drilling rigs

technical field

The utility model belongs to the technical field of non-excavation pipe laying machinery, and relates to a cutter used for cutting underground plastic pipelines on a conventional non-excavation drilling machine.

Background technique

In municipal engineering, there are roughly two reasons for the replacement of underground pipelines: one is that the pipeline has been used for many years, and due to disrepair, the pipeline is damaged and cannot function normally and needs to be replaced. Or because a larger diameter pipeline is replaced at the original hole position. This requires cutting off the original pipeline. In the existing construction, some construction parties are on the conventional non-excavation drilling rig, connected to the common extrusion and expansion drill bit, and want to directly crush the plastic pipe to the hole wall, and then replace it with a new pipe. But the actual situation is that the plastic pipeline to be replaced not only failed to crush the pipe on the wall of the hole as expected, but during the construction process, the pipe piled up more and more at the front of the extrusion drill bit. The stronger it is, the more it can't move at last, and the project can't go on.

Contents of the invention

The purpose of the utility model is to overcome the deficiencies in the prior art, and to provide a simple, ingenious and reasonable cutter for cutting underground plastic pipelines on conventional non-excavation drilling rigs. Underground pipes that need to be replaced are split.

According to the technical solution provided by the utility model: a cutting knife for cutting underground plastic pipelines on a conventional non-excavation drilling rig, it is characterized in that: it includes a central shaft, and the center of rotation of the central shaft is provided with a central through hole, and the central shaft One end is provided with a male thread, and the other end of the central shaft is provided with a female thread. Both the female thread and the male thread are arranged coaxially with the central through hole. Three blades are evenly distributed on the peripheral surface of the central shaft. The cutting edges of the blades are A cutting angle a is formed with the axis of the central shaft, and the cutting angle a is 15°-20°.

As a further improvement of the utility model, rib plates are arranged on both sides of each blade, and the rib plates are welded on the central shaft to clamp and fix the blades.

As a further improvement of the utility model, the female screw thread is a tapered structure with a large inner diameter of the outer opening and a smaller inner diameter of the inner opening.

As a further improvement of the utility model, the male thread has a tapered structure with a small outer diameter at the front end and a larger inner diameter at the rear end.

Compared with the prior art, the utility model has the advantages that: the product structure of the utility model is simple and reasonable, and by setting the male and female threads at both ends of the central axis of the cutter, it can effectively and conveniently work, and according to the different technological requirements of the construction party , to connect different drilling tools, and the central axis is a hollow structure through which it is convenient to pass water through the pipe for other operations when splitting the underground pipeline; in addition, the blade cutting angle of the product structure of the utility model is designed reasonably, which can effectively meet Use needs.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Fig. 2 is a left side view of Fig. 1 .

Fig. 3 is a schematic diagram of the use state of the utility model.

Fig. 4 is a left side view of Fig. 3 .

Detailed ways

Below in conjunction with specific accompanying drawing and embodiment the utility model is further described.

As shown in Figures 1 to 4, it includes central axis 1, male thread 1.1, female thread 1.2, central through hole 1.3, blade 2, rib plate 3, cutting angle a, pipe to be replaced 4, etc.

As shown in Figures 1 and 2, the utility model is a cutting knife used for cutting underground plastic pipelines on a conventional trenchless drilling rig, including a central shaft 1, and the center of rotation of the central shaft 1 is provided with a central through hole 1.3. One end of the shaft 1 is provided with a male thread 1.1, and the other end of the central shaft 1 is provided with a female thread 1.2, both of the female thread 1.2 and the male thread 1.1 are coaxially arranged with the central through hole 1.3, and the peripheral surface of the central shaft 1 is uniformly arranged with three Put the blade 2, a cutting angle a is formed between the cutting edge of the blade 2 and the axis of the central shaft 1, and the cutting angle a is 15°~20°.

Both sides of each blade 2 are provided with reinforcing ribs 3 , and the reinforcing ribs 3 are welded on the central shaft 1 to clamp and fix the blades 2 .

The female thread 1.2 is a tapered structure with a large outer diameter and a smaller inner diameter, and adopts the form of screw connection, which is convenient for the construction party to connect to the existing non-excavation drilling rig.

The male thread 1.1 is a tapered structure with a small outer diameter at the front end and a larger inner diameter at the rear end.

The central shaft 1 in the utility model is made of high-quality alloy steel, and has been adjusted to increase the strength of the central shaft 1. On the circumferential surface of the central shaft 1, three grooves are evenly milled in the axial direction, and the blades are embedded in the grooves. , which is beneficial to firmly fix the blade 2 on the central shaft 1. After the blade 2 is set in the groove, it is fixed by welding; the blade 2 is made of high-quality alloy steel and has been quenched and tempered; the blade is high-frequency quenched to ensure that the cutting blade is sharp ,durable.

The working process of the utility model is as follows: as shown in Figure 3 and 4, after the underground pipe 4 is split with the cutting knife, then the squeeze drill bit is used to crush the cut pipeline to the hole wall, and then pull it into a new Pipeline to realize the replacement of old underground plastic pipelines. The product of the utility model can also be used for cutting old pipes of ceramics, unreinforced concrete, asbestos cement, plastic or cast iron.

Claims (4)

1. A cutting knife for cutting underground plastic pipelines on a conventional non-excavation drilling rig, characterized in that: it includes a central shaft (1), and the center of rotation of the central shaft (1) is provided with a central through hole (1.3), One end of the central shaft (1) is provided with a male thread (1.1), and the other end of the central shaft (1) is provided with a female thread (1.2). Both the female thread (1.2) and the male thread (1.1) are connected to the central through hole ( 1.3) Coaxial setting, three blades (2) are evenly distributed on the peripheral surface of the central shaft (1), the cutting edge of the blades (2) forms a cutting angle a with the axis of the central shaft (1), and the cutting Angle a is 15°~20°. 2. The cutting knife used for cutting underground plastic pipelines on a conventional trenchless drilling rig according to claim 1, characterized in that: each blade (2) is provided with reinforcing ribs (3) on both sides, so The reinforcing rib plate (3) is welded on the central shaft (1), and the blade (2) is clamped and fixed. 3. The cutting knife for cutting underground plastic pipelines on conventional trenchless drilling rigs according to claim 1, characterized in that: the female thread (1.2) is a tapered structure with a large outer diameter and a smaller inner diameter . 4. The cutting knife for cutting underground plastic pipelines on conventional trenchless drilling rigs according to claim 1, characterized in that: the male thread (1.1) is a tapered structure with a small outer diameter at the front end and a larger inner diameter at the rear end .