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Underreamer with extrusion and wall-expansion functions

A reamer and functional technology, which is applied in drilling equipment, pipeline laying and maintenance, pipes/pipe joints/pipe fittings, etc. and other problems, to achieve the effect of improving the ability of drilling wall protection, simple structure and convenient operation

Active Publication Date: 2010-05-05
上海佳友市政建筑有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Their common disadvantages are: ①The reamer itself does not have the guiding ability, and the reaming work in the curved track drilling of trenchless horizontal directional drilling or the curved section of the drilling track will cause the problem of expanding the hole ;②The reamer itself only has the ability to cut and break the hole wall to expand the hole, but does not have the ability to protect the wall of the hole

Method used

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  • Underreamer with extrusion and wall-expansion functions
  • Underreamer with extrusion and wall-expansion functions
  • Underreamer with extrusion and wall-expansion functions

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Embodiment Construction

[0018] The main structure of the present invention is that a guide head 12 is added before the reaming body of the reamer, and a set of hole wall extrusion rollers 14 with an adjustable diameter is added after the reaming body.

[0019] The present invention is mainly composed of a guide head, a reaming head and a variable diameter hole wall extrusion device (attached figure 2 ), the structure and function of each part are as follows:

[0020] The guide head is mainly composed of a joint 1 and a guide head 12. The right end of the joint 1 has threads for connecting with the drill rod, and the left end is welded or threaded with the guide head and the mandrel 8. A number of wear-resistant ribs 28 are installed on the outer surface of the guide head, the diameter of which is slightly smaller than the diameter of the guide hole or the reaming head, and is used to guide the movement track of the reaming head. The left end of the guide head is welded to the right end of the reamer hou...

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Abstract

The invention relates to an underreamer with extrusion and wall-expansion functions, solving the problem that the traditional underreamer does not have wall-protection function and is easy to ream a hole oblately when a hole at a drilling bending section is reamed. A joint (1) is fixedly connected with the front ends of a mandrel (8) and an underreamer shell (6); the rear end of the underreamer shell (6) is provided with a supporting plate; the underreamer shell (6) is fixedly connected with the mandrel (8); a central sleeve (20) of a bracket (16) is in axial movable fit with a polyhedron on the mandrel (8) and is fixed on the mandrel (8) by a bolt or / and a positioning pin; a spoke or a wheel disc of the bracket (16) and the supporting plate are respectively hinged on both ends of a plurality of roller shafts which are in movable fit with rollers; and the rear end of the mandrel (8) is connected with an engaging lug (11).

Description

Technical field: [0001] The invention relates to a drilling reamer of a non-excavation horizontal directional drilling pipe laying device. Background technique: [0002] In the non-excavation horizontal directional drilling pipe laying, drilling and reaming of soft ground is commonly used as attached figure 1 Drilling reamer shown. [0003] In this device, the joint 1 at the left end of the reamer is connected with the drill pipe of the drill by threading, and the joint 1 has a water hole 2 in communication with the waterway of the reamer body. The reamer body is composed of baffles 4, 9 and an outer shell 6 and an inner shell 5. The outer shell 6 is inlaid and welded with a number of cutting tools 3, and a water hole 7 is opened. The joint 1 is coaxially welded to the mandrel 8 and the connecting lug 11, and the entire reamer body is also connected to the shafting parts by welding, and reinforced by the rib 10. [0004] When the drill rod is driven by the rotary torque and axial d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B10/32F16L1/028
Inventor 李山涂昌鹏
Owner 上海佳友市政建筑有限公司
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