CN2107327U

CN2107327U - Drilling tool for removing hard scale from inner tube

Info

Publication number: CN2107327U
Application number: CN 91223913
Authority: CN
Inventors: 金德宝
Original assignee: Individual
Current assignee: Individual
Priority date: 1991-08-29
Filing date: 1991-08-29
Publication date: 1992-06-17

Abstract

The utility model relates to a drilling tool for removing hard scale in a tube. The front end of a hollow drill stem is welded with a drill bit, the position near the caudal end of the drill stem is provided with a filling type rotary seal device, pressure water can be led in a drill stem bore and can be spouted from the front end of the drill stem, powdered hard scale cutting caused by drilling is taken away along the gap of the inner wall of the tube and the drill stem, therefore, drilling work can be continuously and swimmingly carried out, and the hard scale in a pipeline can be removed. The drilling tool with simple structure and convenient operation can be used for removing the hard scale sealed in a long and thin straight pipeline, and the hard scale is difficult to be removed by chemical cleaning and a general outer bore tool.

Description

Drilling tool for removing hard scale from inner tube

The utility model is to remove the boring bar tool that hard scale is used in the pipe, belongs to the technical field of tools of cleaning, cleaning equipment, object.

(for example tubulation of tubular heat exchanger) often has scale formation to take place in the pipe that hot water (or other fluid media (medium)) circulation is arranged.When fouling is not serious, can make it unimpeded again with chemical cleaning method.But when knot when serious chemical cleaning method often efficient is low-cost high, when fouling seriously when pipeline stops up fully because the cleaning soup can't circulation, chemical cleaning method does not generally prove effective.In addition, in the industrial pipeline of some circulation chemistry liquid bulk, can produce certain insoluble fouling (for example carbon dirt, calcium sulfate), chemical cleaning method also is helpless in this case, therefore people adopt boring method to remove hard scale in the pipe sometimes, but because the difficulty of common boring bar tool aspect chip removal and cooling, the hard scale that can only remove little length stops up, when the hard scale stemming length is longer, move back the bits difficulty, drilling efficiency is low, and often blocks drilling rod.Therefore, in the equipment that hard scale stops up in the big length pipe of all kinds of easy generations, usually cause a considerable number of pipeline to scrap even whole equipment scrapping at present because of dredging.

The purpose of the utility model instrument is will provide a kind of can remove the interior hard scale of pipe effectively, comprises the boring bar tool of hard scale in the big length pipe of mediation, stops up the economic loss that cause with avoiding because of hard scale in managing with the cost that reduces the cleaning pipeline.

This tool construction is as follows: drill bit in the front end welding of a hollow drill, the diameter of drill bit less than the internal diameter of drilled pipeline greater than the external diameter of drilling rod, the endoporus of drilling rod leads to the outer surface of drilling rod front end, a material filling type rotary sealing appts is housed on the position near the drilling rod tail end, drilling rod can rotate in this rotary sealing appts, and press water imports the endoporus of drilling rod and can spray from the front end of drilling rod from this device.The tail end of drilling rod seals, and can be rotated (for example being driven by a big electric hand drill) by power drive.Pipe centre that the people is for clearance with drill bit during work, and rotary sealing appts dominated by hand prevents the bearing rotation.Another person controls and operates the electric drill start-stop.(press water can be used running water to import press water when electric drill starts, also available pump supply) press water is sprayed by the drilling rod front end, on the one hand drill bit is cooled off, on the one hand Powdered hard scale drilling cuttings is taken out of endlessly along the gap of drilling rod and tube wall, drilling work is just carried out serially like this, is dredged up to whole pipe.(when tube length is very long, can adopt the way of boring to reduce the length of drilling rod by the two sides.When ips is big, drilling several times, bit diameter strengthens gradually during drilling, can reduce the drilling resistance like this).

Adopt the utility model can remove length at an easy rate and reach 6 meters even the longer interior hard scale of pipe, can be by the internal diameter of pigging from the 10--60 millimeter, even bigger (and size that most of just tubular heat exchangers of this size and industrial packaged boiler smoke pipe adopt).So hard scale in all kinds of tubular heat exchangers of the most suitable cleaning and the industrial packaged boiler smoke pipe pipe, and have characteristics simple in structure, with low cost.Its another characteristics are to be convenient to site operation, do not need the equipment of heaviness is made dismounting, mobile working.

Below in conjunction with drawings and Examples in detail it is described in detail: Fig. 1 is an example structure figure of the utility model drilling tool.As shown in the figure, 1 is a flat drill bit (also can adopt the common spiral bit transformation of the way), and the drill bit main cutting edge becomes circular arc with the junction reconditioning of front cutting edge in order to avoid scratch inside pipe wall.The 2nd, hollow drill is slotted on drilling rod point diameter direction, flat drill bit is embedded and welds knot on drilling rod, and drill pipe bore one is through to the outer surface of front end.The 5th, the bearing of filler rotary sealing appts is contained in the position of drilling rod near tail end, and back-up ring 3 usefulness screws 4 are fixed on the drilling rod, prevent moving axially between bearing and drilling rod.The 6th, the O RunddichtringO makes between bearing inner chamber and the drilling rod and forms sealing state, is drilled with radial hole on the drilling rod at bearing inner chamber position and is communicated with drill pipe bore.The 7th, water inlet pipe, press water import bearing thus and enter drill pipe bore and spray before by drilling rod.The sealing of drilling rod tail end can and drive rotation by the electric hand drill clamping during work.Formed a material filling type rotary sealing appts (preferred design become Mechanical Sealed Type increasing the service life) by 3,4,5,6,7.Water inlet pipe 7 dominated by hand prevents that bearing from rotating during work.Drilling rod also can the segmentation manufacturing, and each intersegmental usefulness is threaded, to adapt to the boring requirement of different length.

Claims

1, hard scale boring bar tool in a kind of removing pipeline, it is characterized in that: the front end at a hollow drill is welded with a drill bit, the bore diameter of drill bit is greater than the external diameter of drilling rod, adorning by bearing 5 near drilling rod tail end place, the material filling type rotary sealing appts that O type circle 6 and back-up ring 3 and screw 4 are formed, this device can make press water import drill pipe bore and be sprayed by the drilling rod front end.

2, the boring bar tool of using according to hard scale in claim 1 and the 2 described removing pipelines is characterized in that: described hollow drill is the segmentation manufacturing and forms to be threaded.