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Middle-low air pressure down-hole hammer

A technology of down-the-hole impactor and wind pressure, which is applied in drilling equipment, earthwork drilling, driving device for drilling in wellbore, etc. and other problems, to achieve the effect of simple and smooth air distribution channel, wide range of working pressure, and improvement of single impact energy.

Inactive Publication Date: 2013-06-26
YICHANG WUHUAN ROCK DRILLING TOOLS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The above-mentioned non-valve double-cylinder submersible impactor has the following disadvantages: 1. There is a rubber ring between the valve seat and the rear joint, which can absorb a certain amount of energy by itself when the impactor is working. After a period of time, the aging and deformation of the rubber will cause vibration and seriously affect the matching accuracy of the various components, thereby reducing the work efficiency and shortening the working life of the impactor
2. The thin and long structure of the inner cylinder makes the processing more complicated and the production cost is high; and both ends of the inner cylinder are always under stress
3. The piston always reciprocates in the inner cylinder, which increases the wear of the inner cylinder
4. There are more intake and exhaust passages, resulting in greater air pressure loss
5. The failure rate of the built-in valve is high
6. Since the inner cylinder is a thin-walled long piece and is affected by force, its applicable wind pressure range is small (0.5-1.2MPa)

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Such as figure 2 As shown, a medium and low wind pressure down-the-hole impactor includes a rear joint 1, a check valve 2, a gas distribution rod 4, a piston 6, an inner cylinder 5, an outer sleeve 7, a collar 8, a guide sleeve 9, a plug 16. The first spring 17, the rubber rod 18, the cross pin 19, the pin type drill bit 20 and the pin type front joint 21, the check valve is a one-way valve, which has a valve seat and a second spring 3, the The piston is a slender piston with a hole, and it is characterized in that: the gas distribution rod and the air intake seat 22 at the rear end of the check valve are integrated, and the inner cylinder is located outside the gas distribution rod and the piston. During the process, the mating end of the piston and the gas distribution rod is always inside the inner cylinder, a cavity is formed between the piston part and the outer sleeve, and the rest of the piston cooperates with the inner cylinder. The outer side of the air intak...

Embodiment 2

[0026] Such as image 3 , it differs from Embodiment 1 in that the device for preventing the drill bit from falling off is different. In Embodiment 1, the plugging 16, the first spring 17, the rubber rod 18, and the cross pin 19 are used to ensure that the drill bit does not fall off. Open snap ring 11 guarantees that drill bit 15 does not come off, and front joint 14 is to be used for driving drill bit 15 to rotate and slide. At this time, a third O-shaped sealing ring 13 will be arranged between the snap ring 11 and the front connector.

[0027] The working principle of the present invention is as follows:

[0028] In order to start the impactor, the impactor must be lowered first. When the drill bit is in contact with the rock and jacks up the piston is in figure 2 When the position shown is reached, preparations for start-up are complete.

[0029] The high-pressure gas P introduced from the hollow channel 24 of the rear joint pushes back the check valve 2 and passes t...

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PUM

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Abstract

Provided is a middle-low air pressure down-hole hammer. The middle-low air pressure down-hole hammer comprises a back joint, a check valve, an air-distribution rod, a piston, an internal cylinder, an outer casing pipe, a clamping ring, a guide sleeve, a plug, a first spring, a rubber stick, a lateral pin, a pin-hanging type drill and a pin-hanging type front joint. The check valve is a one-way valve and provided with a valve seat and a second spring. The piston is a long-and-thin-shaped piston with a hole path. The air-distribution rod and an air inlet seat at the back end of the check valve are of an integrated structure. The internal cylinder is placed outside the air-distribution rod and the piston. In the process of piston motion, the matched end of the piston and the air-distribution rod is in the internal cylinder all the time, a cavity is formed between part of the piston and the outer casing pipe, and other parts of the piston are matched with the internal cylinder. According to the middle-low air pressure down-hole hammer, the air distribution rod and the valve seat of the check valve are integrated, the structure is simple, the functions of locating, vibration damping and air suction can be achieved, and stability and reliability are achieved in the process of work. Contact portions of the piston and the internal cylinder are reduced, and therefore the internal cylinder is wear-resisting, and working pressure ranges of the hammer are wide.

Description

technical field [0001] The invention relates to a pneumatic impact device, in particular to a pin-type down-the-hole impactor with medium and low wind pressure. Background technique [0002] The down-the-hole hammer is a typical pneumatic impact device. It is the drilling tool of the down-the-hole drilling rig and the working mechanism of the drilling rig for drilling. This equipment is mainly used for drilling blast holes with a diameter of 65-305mm and a hole depth of 60m. Among them, the drilling operations with a hole diameter of about 65-105mm are generally completed by medium and low pressure down-the-hole drilling tools. [0003] At present, the low-wind pressure down-the-hole impactors used in the market are characterized by a valve plate inside. Through the reversing of the valve plate, the compressed air can alternately enter the front and rear air chambers of the impactor to complete the air distribution action, and finally make the piston travel. into a recipro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B4/06
Inventor 龚康强孙超
Owner YICHANG WUHUAN ROCK DRILLING TOOLS
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