SU1502796A1 - Arrangement for lubricating roller bit bearings - Google Patents

Abstract

The invention relates to a drilling technique. The goal is to increase the durability of the bit by providing an optimal lubrication mode for the bearings by automatically lubricating the lubricant depending on the axial load on the bit created by the hydraulic cylinders of the drill stem feeding mechanism. For this purpose, the lubricant flow controller is made in the form of a cylinder (C) 14 with an aperture 15, which communicates the internal cavity of the reservoir above the lubricant with the sub piston cavity C 14 and with the atmosphere. Inside C 14 a spring-loaded piston 16 is placed with the possibility of changing the bore of the bore 15 at the working stroke of the piston. The piston cavity of the cylinder 14 is in communication with the choke; the piston cavity C 14 is hydraulically connected to the hydraulic cylinders of the drill stem feeding mechanism. A fitting and an ejector are installed in the nozzle with the possibility of their openings being angularly displaced relative to the directional movement of the gaseous agent flow. The consumption of lubricant depends on how closed the hole 15 of the piston 16, and it in turn depends on the axial load on the bit. The height of the hole 15 and the stiffness of the spring of the piston 16 are calculated so that the complete overlap of the hole 15 occurs at the maximum permissible axial load for the given bit. In addition, the flow rate of the substance can, if necessary, be controlled by the angular displacement of the openings of the ejector and choke with respect to the direction of movement of the gaseous agent flow. 1 hp f-ly, 4 ill.

Description

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substances made in the form of a cylinder (C)

14 with a hole 15 that communicates the internal cavity of the tank

above. lubricant with a podporshnevoy cavity, c 14 NS atmosphere. Inside C 14 rachmeten spring-loaded piston 16 with the ability to change the orifice bore

15 when the stroke of the piston. The sub-piston cavity of the cylinder 14 communicates with the choke, the over-piston cavity of the C 14 is hydraulically connected

with hydraulic cylinders of the feed mechanism of the drill rod. A fitting and an ejector are installed in the nozzle with the possibility of their openings being angularly displaced relative to the directional movement.

gaseous agent stream. The consumption of lubricant depends on how closed the hole 15 of the piston 16, and it in turn depends on the axial load on the bit. The height of the hole 15 and the stiffness of the spring of the piston 16 are calculated so that the complete overlap of the hole 15 occurs at the maximum permissible axial load for the given bit. In addition, the flow rate of the substance can, if necessary, be controlled by the angular displacement of the openings of the ejector and choke with respect to the direction of movement of the gaseous agent flow. 1 hp f-ly, 4 np "

The invention relates to a drilling technique, namely, devices for lubricating roller bit supports, and can be used on drilling machines that drill wells with bottom cleaning, preferably with a gaseous agent.

The purpose of the invention is to increase the durability of the bit by providing an optimal lubrication mode for the bearings by automatically controlling the lubricant consumption depending on the axial load on the bit created by the hydraulic cylinders of the drill stem feeding mechanism.

Fig. 1 schematically shows a device for lubricating the bearings of a chisel bit; Fig. 2 shows a node I in Fig. 1 (a node of a branch pipe integrated into the pneumatic line); FIG. 3 shows the node II in FIG. 1 (the flow regulator assembly); Fig. 4 is the same, with a different orientation of the openings of the ejector and choke with respect to the direction of movement of the flow of the gaseous agent.

The device contains a reservoir 1 for a lubricant placed on a drilling machine and a system for forcing this substance into bit supports 2, including 2 branch pipe 4 with a narrower 5 and 6 wide sections built into the pneumatic line. The narrowed portion of the nozzle is connected to the packing unit 7 of the front end 8 and is equipped with an ejector 9 connected to the tank by the oil pipe 10. A wide part of the pipe is connected to the discharge line 11 of the machine compressor (not shown) and provided with a nozzle 12 for communication with the internal cavity of the tank over lubricant. The device is equipped with a regulator 13

lubricant consumption, volt0

in the form of a cylinder 14 with an opening 15, which communicates the internal cavity of the reservoir above the lubricant with the atmosphere, and is placed5 inside the specified cylinder with the possibility of changing the cross section of its opening of the spring-loaded piston 1 &, hydraulically connected with the hydraulic mechanism of the drilling rig (not shown). A wide portion of the nozzle may additionally communicate with the internal cavity 17 of the flow control cylinder through an orifice.

5 18. The same hole, as well as the channel 19 in the cylinder, serves to communicate a wide section of the nozzle with the internal cavity of the reservoir above the lubricant through the hose 20. The ejector 9 and the nozzle 12 can, if necessary, be turned by their openings relative to the direction of flow of the gaseous agent. For filling the lubricant, the reservoir has a neck 21, closed by a stopper 22,

The device works as follows.

In the process of heat, the gaseous agent from the compressor is supplied via pneumomagnetic 3 through the packing unit 7, the drilling station 8 and the bit 2 is fed into the well to clean the bottom from the products of destruction and cooling of the bit. When the gaseous agent passes through the pipe 4 between its wide 6 and narrowed 5 areas, a pressure differential is created. At the same time, the pressure of the gaseous agent from the wide part of the nozzle is transmitted through the fitting 12, pschang 20, hole 18 and channel 19 in the cylinder 14 to the internal cavity of the reservoir 1 above the lubricant. When the bore is not loaded on the bit, the piston 16 of the flow regulator is in the extreme upper position and the hole 15 of the cylinder 14, which communicates the internal cavity of the reservoir above the lubricant with the atmosphere, is open. In this case, the pressure in the tank is equal to atmospheric and the lubricant does not enter the pneumatic main. When an axial load on the bit is created, the pressure in the hydraulic cylinders of the drill stem feeding mechanism disappears, as a result of which the hydraulically connected piston 16 of the flow regulator starts to move downward, compressing the spring and closing the opening 15. The decrease in cross section of the opening 15 causes an increase in pressure in the reservoir. Under the action of this pressure, as well as the pressure drop in the pipe 4, the lubricant through the oil pipe 10 through the ejector 9 enters the narrowed section 5 of the pipe 4 .. Here the lubricant is sprayed in the flow of the gaseous agent and through the pneumatic 3 through the stuffing box and drilling rig 8 enters the bit 2 where it is separated from the flow, for example, by means of an oil bushing installed in the central blowing channel of the bit, and with a part of the gaseous agent through the channels in the legs of the bit enters the grease cutters and cooling bearings.

The consumption of lubricant depends on how closed the hole 15 is with the piston 16. The latter, in turn, depends on the axial load on the bit, rather than

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the axial load, the more the piston 16 and 1z displaces and closes the orifice 15, and, consequently, the pressure in the pump increases and the lubricant consumption increases. The height of the hole 15 in the spring stiffness of the piston 16 is calculated so that the full

JO overlap occurred at the maximum permissible axial load for a given chisel. In this case, the consumption of lubricant will be maximized. Additionally

15 to this, the flow rate of the lubricant can, if necessary, be controlled by the angular displacement of the openings of the ejector 9 and the nozzle 12 with respect to the direction of flow of the gas-20 different agent.

When drilling is stopped and the axial load on the bit is removed, the piston 16 is displaced upward to its original position by the action of a spring.

25, the opening 15 is opened, together with the internal cavity of the reservoir above the lubricant with the atmosphere. . As a result, the pressure in the reservoir becomes equal to atmospheric and the lubricant supply to the air line is stopped if even the gaseous agent continues to flow into the well, for example, for Purging.

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Claims (1)

Invention Formula 1 o A device for lubricating roller bit supports containing a reservoir with a lubricant, a pneumatic line for supplying a gaseous agent with a branch pipe, has 1 and 2 narrow sections, an ejector which is hydraulically connected to the tank and located in a wide section of the branch pipe. pipe and communicated with the internal cavity of the reservoir above the lubricant, characterized in that, in order to increase the durability of the bit by providing an optimum lubrication mode of the supports by automatic Due to the axial load on the bit generated by the hydraulic cylinders of the drill stem feeding mechanism, it is equipped with a lubricant flow regulator. released as a cylinder with an opening, enclosing the internal cavity of the reservoir above the lubricant with the piston chamber of the cylinder and the atmosphere, and a spring-loaded piston placed inside the cylinder with the possibility of changing the bore of the cylinder bore during the working stroke of the piston; torus, and nadporshneva cavity qi The regulator lindra is hydraulically connected to the main cylinders of the drill stem feeding mechanism. 2c. The device according to claim 1, characterized in that the ejector and the fitting are installed in the nozzle with the possibility of angular displacement of their openings relative to the direction of movement of the flow of the gaseous agent. FIG. g qji / f-if