A combined drilling tool for deep descaling that facilitates disassembly and assembly of the drill bit

Abstract

The present invention relates to a deep descaling combined drilling tool which is convenient for disassembly and assembly of the drill bit, which comprises a drill bit (1), a hollow transmission rod (2) and a hollow drill rod (4), and the hollow transmission rod ( 2) connection, several of the hollow drill rods (4) are threaded to increase the length of the drill rods to achieve deep descaling, and a fixed tail cone (8) is threaded on the top of the hollow drill rods (4), and the fixed A handle (6) is welded on the tail cone (8), a cooling and flushing water inlet (5) is provided on the hollow drill pipe (4), and a drill pipe cooling and flushing inlet (5) is provided on the hollow transmission rod (2). The water outlet (7), the drill bit (1) is provided with a drill bit cooling flushing water outlet (9), and the section at the tail of the drill bit (1) is 0.3-0.8 times the section of the hollow transmission rod (2), The hollow transmission rod (2) is made of copper alloy, and the drill bit (1) is made of cobalt-nickel alloy, and there are 2-5 pieces.

Description

technical field [0001] The invention relates to a drill bit, in particular to a deep descaling drilling tool which is convenient for disassembly and assembly of the drill bit. Background technique [0002] Scaling is ubiquitous, especially in the boiler pipes. The scale attached to the inner wall of the pipes is constantly thickening, which affects the circulation of the induced air volume, resulting in insufficient output of the boiler and a decline in the economy of boiler production. Descaling of shorter boiler pipes is usually easier, and the existing technology is sufficient to complete it, whether it is pickling method or drilling tool drilling method, but for the descaling of longer pipes, it cannot be cooled in time due to the inability to extend the drill pipe conveniently Drilling tools and other problems make the descaling effect not good and the efficiency low. Ineffective descaling of long pipelines brings serious problems. For example, due to the continuous th...

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Problems solved by technology

[0002] Scaling is ubiquitous, especially in the boiler pipes. The scale attached to the inner wall of the pipes is constantly thickening, which affects the circulation of the induced air volume, resulting in insufficient output of the boiler and a decline in the economy of boiler production.

Descaling of shorter boiler pipes is usually easier, and the existing technology is sufficient to complete it, whether it is pickling method or drilling tool drilling method, but for the descaling of longer pipes, it cannot be cooled in time due to the inability to extend the drill pipe conveniently Drilling tools and other problems make the descaling effect not good and the efficiency low

Ineffective descaling of long pipelines brings serious problems. For example, due to the continuous thickening of scale, the service life of the air preheater is greatly reduced, the equipment update cycle is shortened, the operating cost is increased, and the reuse rate of the boiler is affected.

This kind of scale is made of high-temperature molten ash when it is cooled slowly. The scale is hard, has a certain strength, and has poor compatibility with chemical reagents.

[0003] The existing drilling tool used for drilling deep pipes includes a drill pipe, the rear part of the drill pipe is fixed with a tail cone, the front part of the drill pipe is fixed with a spiral drill bit, and the tail of the drill bit has the same diameter as the drill pipe. Every time about 20mm is processed, the drilling tool must be taken out for chip removal, which is very troublesome and the processing speed is slow

In addition, when working, the drill bit needs to be cooled. The current cooling method is to pour cooling water directly with water pipes, which has poor cooling effect and wastes water resources.

And the existing descaling drilling tools also have the following problems. For example, the transmission shaft drives the drill bit to rotate at a high speed during work, and the drill bit is often scrapped and needs to be replaced. As we all know, the connection methods of the drill pipe and the joint include: 1. threaded connection; 2. plasma arc welding; 3. friction welding

Threaded connection is the most common one, which is low in cost and easy to use. Especially for various small drilling tools, most of them use threaded connection, and it is inconvenient to disassemble during the replacement of this kind of connection.

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