Pneumatic down-striker

FIELD: mining industry.

SUBSTANCE: device has body, striker with central through channel, separating body hollow on chambers of straight and backward drive, air-distributing system, containing stepped feed-discharge valve, valve saddle with apertures for feeding straight action chamber, central pipe, apertures in the body, connected to behind-valve hollow, connected to slit channel. Air-distribution system additionally has discharge channel, positioned between valve saddle and end of greater step of feed-discharge valve, connected on one side to straight action chamber through valve saddle apertures, and on the other side - to slit channel through ring-shaped channel, formed between body and outer surface of greater step of feed-discharge valve.

EFFECT: higher efficiency, broader functional capabilities.

2 cl, 2 dwg

 

The technical solution relates to the drilling machinery designed for drilling, rotary percussive way, and may find application in mining and construction. Preemptive scope - underground mining of mineral deposits.

Known pneumatic percussion mechanism as the USSR №848615, CL E 21 3/24, publ. in BI No. 27, 1981, comprising a housing in which is situated a piston forming with the walls of the camera work and idling, an annular elastic valve placed in the saddle and forming with the casing a channel for the supply of the carrier in the chamber of the stroke, and the tool, the valve has the shape of a torus, is installed in an annular groove made on the outer surface of the valve seat.

Described pneumatic percussion mechanism has the disadvantage that, when triggered, an annular elastic valve used his inner strength elasticity, designed for a certain operating pressure energy in the line. Therefore, operation at reduced pressure, for example when saurce wells, stability pneumatic percussion mechanism is broken. In addition, it is not provided with forced eviction extract energy from the chamber of the stroke when piston reversal that creates prot is podavlenie in this chamber, reduces stroke and as a result does not allow to obtain high-energy impact.

Also known pneumatic percussion mechanism as the USSR №998740, CL E 21 3/24, publ. in BI No. 7, 1983, which differs from the above-mentioned device, as the USSR №848615 because it is an additional elastic valve in the form of a torus, forming with the inner walls of the body channel for release of air from the chamber stroke.

In this pneumatic mechanism is achieved by increasing the stroke of the piston and increasing the impact energy, as it is provided by the reduction in back pressure at idle piston. The disadvantage of it is that the primary and secondary elastic valves kinematically linked, and when the mechanism at different pressures of energy is violated synchronizing the operation of these valves and as a consequence stable his work.

The closest in technical essence and essential features to the proposed technical solution is downhole air hammer by A.S. USSR №229369, CL E 21 B 1/06, E 21 3/24, publ. in BI No. 33, 1968, including the cylinder head, the air-distributing device with a Central tube having a flange and a member of the through hole of the piston-pin, while the flange of the Central tube is made with throttle openings and channels DL is the exhaust energy is placed on the outer surface of the head, having a threaded connection with the cylinder.

According to the description of the prototype, its design during reverse motion of the striker from the chamber of the stroke the air is expelled into the atmosphere (borehole space) through the discharge path of the air guidance system: throttle openings 8, zaklepanju cavity with channels 9 and openings in the cylinder 13.

The disadvantage of this submersible hydropercussion machine is that the discharge chamber stroke is carried out through the throttle opening, the throttle cross section which does not effectively reduce the back pressure in this chamber to increase the stroke of the striker and a significant increase of the impact energy. Execution throttle holes with a large pass-section leads to violation of the terms of perekidki valve. In addition, the active area of the valve-side chamber stroke is reduced by the value of the reference peripheral areas caused by landing it on the end surface of the flange, resulting in poor working conditions at different pressures of energy. In the prototype does not provide a command input of energy into the chamber stroke for timely perekidki valve, which reduces the reliability of starting and stable operation of submersible hydropercussion machine in a wide range of pressure energy.

The technical objective is to improve the giving of the impact energy by increasing the stroke of the striker and ensure reliable starting and stable operation at a wide range of pressure energy due to timely filing of the command operation manual pithouse-bit valve.

The problem is solved by the fact that in the proposed submersible hammer, comprising a housing, a drummer with a Central through-channel which separates the cavity of the body on camera forward and reverse, air distribution system, containing step pithouse-bit valve, valve seat with holes for camera power forward stroke, the Central tube, the holes in the case, United with zakladnoi cavity provided with a slit channel, according to the proposed solution, the air distribution system further comprises a discharge channel located between the valve seat and the butt is wider pithouse-bit valve is provided, on the one hand, with camera a forward stroke through the holes of the valve seat, and on the other hand, with slot channel through the annular channel formed between the housing and the outer surface is wider pithouse-bit valve.

This set of features allows you to refuse the execution throttle openings and a discharge chamber for forward travel in the reverse course of the drummer to carry out through the holes of the valve seat substantially larger flow area compared to the reduced cross section of the throttle holes prototype that provides a more effective snizeni the back pressure in the chamber forward stroke, increase the stroke of the striker and as a consequence the increase of the impact energy. In addition, education in air-distribution system further bit channel between the valve seat and the butt is wider pithouse-bit valve greatly increases its active site, which reduces the time perekidki speed pithouse-bit valve.

Suitable on the side surface of the Central tube, in the area of the camera forward stroke to perform longitudinal command channels.

To ensure reliable starting and stable operation of the submersible hydropercussion machine in a wide range of pressure energy required timely filing carrier in the camera forward stroke to trigger pithouse-bit valve. In the proposed submersible hammer filing carrier in the camera forward stroke is completed through these longitudinal command channels.

The essence of the technical solution is illustrated by a specific example of the structural design and drawings, in which figure 1 shows a longitudinal section of a submersible hydropercussion machine, the General view in the static condition; figure 2 - node a in figure 1 on an enlarged scale during operation of the submersible hydropercussion machine, and the left side of the drummer in the extreme upper position, the end of the reverse - the beginning of the forward stroke, and speed pithouse once adny valve in the “power” of the camera forward stroke, the right side is the drummer in the lowest position (figure 1), the end of the forward stroke, and speed pithouse-bit valve in position “discharge” (figure 2).

Downhole air hammer (hereinafter - the hammer) consists of a body 1 (Fig 1), with the bottom row of exhaust channels 2 and the upper row of holes 3, b 4, having a Central through channel with the bore 5, the annular groove 6 and the longitudinal grooves 7, is made on the lateral surface, and separating the cavity of the housing 1 on the forward stroke chamber 8 and the camera 9-reverse, periodically connected with the casing (borehole) space through the exhaust channels 2 of the housing 1. In the front (head) of the housing 1 is fixed to the coupling 10 with the drilling tool 11 having a sliding splined connection 12 and plug 13. The drilling tool 11 has a tail 14 and head 15 parts, made respectively with axial vent channel 16 and the downhole purge channels 17. From the shock of the end of the tail section 14 of the drilling tool 11 is installed depreciation ring 18. At the top (rear) of the housing 1 posted by diffusion system that contains the adapter 19 with the groove 20 and holes 21, step pithouse-bit valve 22 installed in the adapter 19 in the area of the grooves 20 and holes 21, the valve behold the lo 23 with holes 24 and 25 to periodically power the camera 8 forward stroke through the ring 26 and the end 27 of the channels, formed between a stepped pithouse-bit valve 22 and valve seat 23. Between the housing 1 and greater degree pithouse-bit valve 22 and between the butt this stage and valve seat 23 formed respectively annular channel 28 and the discharge channel 29 reporting periodically the forward stroke chamber 8 with the casing (borehole) space through the openings 24 in the valve seat 23, a slit channel 30, zaklepanju cavity 31, the holes 21, the groove 20 in the adapter 19 and the holes 3 in the housing 1. In the valve seat 23 is installed with the possibility of axial movement of the Central tube 32 with the supply 33 and the purge 34 channels, with locking window 35 (2), the longitudinal command channels 36, box 37 and grooves 38 (Fig 1) to periodically power the camera 9 reverse.

The hammer operates as follows. The energy of the line applied to the adapter 19 (1) the composition of the rods in the position of the striker 4 “the beginning of the return stroke” and set to “discharge” step pithouse-bit valve 22 (figure 2, right half) of the supply channel 33, the Windows 37 and grooves 38 of the Central tube 32, the bore 5 of the striker 4 enters the chamber 9 reverse. The forward stroke chamber 8 is currently under reduced pressure, connected to the casing (borehole) space through the longitudinal grooves 7 and the annular groove 6 UDA is nick 4 and exhaust channels 2 of the housing 1. In addition, the forward stroke chamber 8 in the position of the striker 4 “the beginning of the return stroke” and set to “discharge” step pithouse-bit valve 22 (figure 2, right half) is in communication with the casing (borehole) space through the discharge path of the air guidance system: holes 24 of the valve seat 23, the discharge channel 29, the annular channel 28, slotted channel 30, zaklepanju cavity 31, the holes 21 and the groove 20 in the adapter 19 and the holes 3 in the housing 1. Due to the pressure differential in the chambers 8 and 9, the striker 4 is doing the reverse. As movement of the striker 4 first overlap exhaust channels 2 in the housing 1, then the grooves 38 of the Central tube 32,the supply chamber 9 reverse. When the forward stroke chamber 8 remains in communication with the casing (borehole) space through the above-described bit path of the air guidance system. Further, the bore 5 of the striker 4 is in the area of the longitudinal command channels 36 of the Central tube 32 and an energy source under arterial pressure begins to flow in the forward stroke chamber 8 through the longitudinal command channels 36. At the same time, the reverse camera 9 is connected with casing (borehole) space through the exhaust channels 2 of the housing 1. Pressure in it drops sharply, and in the forward stroke chamber 8, the pressure increases, resulting in the transfer step pithouse-RA the inline valve 22 from position “discharge” (figure 2, the right half) in the position of “power” (figure 2, left half). The movement of the striker 4 is retarded to a complete stop and change from reverse to direct. When the forward stroke chamber 8 communicates with the line of energy through the ring 26 and the end 27 of the channels and openings 24 in the valve seat 23. Drummer 4 with increasing speed moves in the direction of the drilling tool 11. After the opening of the exhaust channel 2 in the housing 1 drummer 4 forward stroke chamber 8 communicates with the casing (borehole) space. Pressure in it drops sharply decreases and the force holding step pithouse-bit valve 22 in the position of “power” (figures 1 and 2, the left half). Under the action of the line pressure energy coming through the holes 25 of the valve seat 23, to a lesser degree pithouse-bit valve 22, a stepped pithouse-bit valve 22 is transmitted from power supply (figure 1 and 2, the left half) to “discharge” (figure 2, right half). In addition to the exhaust channels 2 of the housing 1, the forward stroke chamber 8 communicates with the casing (borehole) space through a bit above the path of the air guidance system. Camera 9 reverse communicates with the line of energy through the supply channel 33, box 37, the grooves 38 of the Central tube 32 and the bore 5 of the striker 4. UDA is nick 4 strikes on the drilling tool 11 and the cycle repeats.

Cleaning of the bottom hole from the destroyed rocks through the purge channel 34 of the Central tube 32, the axial vent channel 16 and the downhole air passages 17 of the drilling tool 11. Auto lock (stop work) hydropercussion machine is carried out while moving the drilling tool 11 and the Central tube 32 forward (at separation hydropercussion machine from the borehole bottom). The camera 9 reverse rethermalized through the gaps in splined connection 12 of the coupling 10 and the drilling tool 11, the pressure in it drops. The forward stroke chamber 8 communicates with the line of energy through the locking box 35 Central tube 32. It is supported by the increased pressure compared to the pressure in the chamber 9 reverse that holds the striker 4 on the drilling tool 11. Work hydropercussion machine stops.

Due to the fact that in the proposed hammer stepped pithouse-bit valve 22 in combination with the housing 1 and the valve seat 23 is formed in the air-distribution system bit tract increased flow area compared to the prototype, reverse the course of the striker 4, the pressure in the chamber 8 forward stroke is substantially less than in the prototype. Therefore, the stroke of the striker 4 is increased, resulting in increase in the impact energy. The operation speed is itausa-bit valve 22 is on the team and is not affected by back pressure in the chamber 8 of the forward stroke, that ensures reliable starting and stable operation hydropercussion machine in a wide range of pressure energy.

1. Downhole air hammer, comprising a housing, a drummer with a Central through-channel which separates the cavity of the body on camera forward and reverse, air distribution system, containing step pithouse-bit valve, valve seat with holes for camera power forward stroke, the Central tube, the holes in the case, United with zakladnoi cavity provided with slot channel, wherein the air distribution system further comprises a discharge channel located between the valve seat and the end is wider pithouse-bit valve is provided, on the one hand, with the camera forward stroke through the holes of the valve seat, and the other hand, with slot channel through the annular channel formed between the housing and the outer surface is wider pithouse-bit valve.

2. The hammer according to claim 1, characterized in that on the side surface of the Central tube, in the area of the camera forward stroke performed longitudinal command channels.



 

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