Device for horizontal cutting of cores from well walls or channels

FIELD: nuclear engineering.

SUBSTANCE: invention relates to devices designed to cut cores from well walls or channels and can be used in nuclear engineering to cutting graphite cores from channel-type uranium-graphite reactor lining. Proposed device comprises bearing rod with rotary drive, tubular cutter, and tubular cutter rotation-and-feed mechanism. The latter consists of drive bevel gear interacting with hollow gear shaft and fixed sleeve with outer thread arranged inside said hollow gear shaft. Note here that tubular cutter represents a sleeve with inner thread screwed on aforesaid fixed sleeve.

EFFECT: ease of cutting complete cores over entire width of graphite block at 90° to block location without using whatever means capable of destructing or fouling cores.

2 dwg

 

The invention relates to a device for drilling cores from the borehole walls or channels and can be used in the field of nuclear energy for drilling cores of graphite from the clutches of the uranium-graphite channel-type reactors.

The number of known devices for the selection of cores, related to mining and intended for selection of core samples of rock. For example, a device for sampling pressurized core samples from the borehole wall [EN 2251618 C2, IPC EV 49/06, publ. 10.05.2005,]. The device consists of a body in which is kinematically connected to the motor, gearbox and drill with a circular cutter. With brown through a transmission mechanism kinematically connected with the tube, overlapping campopiano the cartridge. Gear is made in the form of a rotary drum with a curved cutout on the lateral surface, deflecting finger and the pivot arm. Deflecting the finger slides in the curved neckline and is rigidly connected with the housing of the drill. A swing arm, one end of which is connected to the drum, and the other with the tube by mechanical pair - pin plug.

The device operates as follows: the device is lowered into the borehole, with the drill, the presser lever are in their original condition. On command from the ground in the lowered into the well the core sampler includes electric motor is spruce, by the kinematics causes the rotation of the annular cutter and hydraulically rotates the clamping lever so that it presses cerapiinit to the borehole wall.

The disadvantage of the design is its large dimensions, which, given the location of the cutter in the upper part of the device and the narrowing of the flow channel tract reactor graphite under masonry, does not allow the selection of cores at lower elevations of the masonry uranium-graphite reactor. The use of hydraulic mechanism in the design can lead to the ingress of fluid in the graphite stack of a nuclear reactor, which is unacceptable due to safety requirements of nuclear facilities.

It is also known device "Shooting the cutter; type BKDG"intended for selection of point samples from the walls of the wells [Hood S.M., Sagebiel G.T. Drilling. M.: Nedra, 1990. - S-267], including lateral cable double cutter; with the powder chamber. Side cable double cutter; BKDG consists of three identical buildings, coaxially screwed them in trunks, bearing the heads attached to the body of the leash is a rope. The powder chamber, divided by a partition into two parts, after charging the explosive is isolated from the trunks gaskets. The current passing nichrome spiral firing eliminate the STV heats up and ignites the explosive (gunpowder). Hollow jaunty under the pressure of the gases emitted from the trunks and, penetrating into the walls of the well, filled with rock.

A disadvantage of this device is the use of explosives. Since graphite clutches of a nuclear reactor is fire and dangerous object, applying the above firing of the cutter; to extract graphite cores are actually excluded from the requirements of nuclear safety and security. Application of the unit can cause significant damage and disruption of the cores due to the brittleness of graphite.

A device for obtaining samples from the walls of the wells or channels [London], No. 932.769, Index at acceptance: - classes 85, Al (A: B: D2); and 39 (4), Q1A2. International Classification: E21b (G21), publ. 14.02.1961], taken as a prototype, containing a carrier arm is provided with a rotational drive, the tubular cutter, the rotation mechanism and the simultaneous filing of the tubular cutter. The rotation mechanism and the simultaneous filing of a tubular cutter consists of a system of gears and the coupling, by means of which rotation is transmitted, on the one hand, the tubular cutter that provides its rotational movement, on the other hand, worm, providing movement of the tubular cutter along the axis perpendicular to the carrier bar.

A disadvantage of this device is the design complexity. If this device does not allow the SEL is to address the core throughout the wall thickness of the graphite block.

The objective of the invention is to develop a device that can extract the integral core through the entire thickness of the walls of the well or channel at an angle of 90° relative to the axis of the bore or channel. The selection of an integral core, corresponding in size to the thickness of the graphite block is necessary to obtain experimental data on layer-by-layer distribution of the physico-mechanical and radiative properties of graphite on the wall thickness of the graphite block.

The problem is solved in that the device containing the carrier arm is provided with a rotational drive, the tubular cutter, the rotation mechanism and the simultaneous filing of the tubular cutter, the rotation mechanism and the simultaneous filing of a tubular cutter consists of a leading bevel gear interacting with mounted on the cutter driven hollow shaft, gears, and a stationary sleeve with an external thread, is placed in the cavity of the slave of the hollow gear shaft, and a tubular cutter is made in the form of a sleeve with internal thread and is screwed on the fixed sleeve.

Figure 1 shows the proposed device, a longitudinal section. Figure 2 presents the scheme of drilling graphite cores from the clutches of uranium-graphite reactors using the proposed device, a longitudinal section.

Device for selection of the cores consists of three main parts: the carrier bar 1, the drill d is deft 2, the rotation mechanism 3 and the simultaneous filing of the tubular cutter.

The supporting rod 1 consists of a casing 4, which is located inside the shaft 5 mounted on the ends of the bearings 6, 7. On the upper end of the shaft 5 is fixed to the flywheel 8 and cap nut 9. For graphite dust suction and retraction of the core in the upper part of the casing 4 of the rod 1 has a nozzle 11.

The boring head 2 includes a housing 12, a tubular cutter 13, the supporting nut 14.

The rotation mechanism 3 and the simultaneous filing of a tubular cutter includes a fixed sleeve 15 with an external thread, a leading bevel gear 10 attached to the lower end of the shaft 5, and a driven hollow pinion shaft 16.

The fixed sleeve 15 is placed in the inner cavity of the slave of the hollow gear shaft 16 and screwed into the body 12 of the drill head 2.

Tubular cutter 13 is made in the form of a sleeve with internal thread and is screwed on the fixed sleeve 15. Tubular cutter has at one end cutting edge 17, and the other two teeth 18 for coupling with longitudinal grooves 19 of the slave of the hollow gear shaft 16. The supporting nut 14 serves to prevent twisting of the tubular cutter 13 with a fixed sleeve 15.

Leading bevel gear 10 is in mesh with the driven hollow shaft-gear 16. The casing 4 of the rod 1 inserted into the body 12 of the drill head 2. In the body 12 of the drill head 2 and the fixed sleeve 15 has a channel 20 is La pumping dust from drilling and retraction of the core inside the tubular cutter 13. The device is equipped with a platform 21 for adjusting the depth of immersion of the rod 1 in the channel or bore and to choose the direction of drilling.

The device operates as follows.

The device is lowered to the desired depth of the channel (e.g., tract uranium-graphite reactor) and fix with the platform 21 on the upper nodes of the channel (well) and set the direction of drilling. Turning the handwheel 8 (see figure 1), are set in motion a leading bevel gear 10, and through her slave hollow pinion shaft 16. A driven hollow shaft gear 16 rotates, moves the tubular cutter 13 in the clutch teeth 18 with longitudinal grooves 19. Tubular cutter 13 fastened with a fixed sleeve 15, performing simultaneously with the rotation of the translational motion, cutting edge 17 in the graphite block 22 (see figure 2), and drills out the graphite core 23. The speed of rotation, the depth of the entrance to the graphite block 22 depend on speed of rotation of the flywheel 8. The graphite dust suction and retraction of the graphite core 23 to the inside of the tubular cutter 13 through channel 20 and the fitting 11.

By setting a certain number of revolutions, achieves a certain depth of cutting of the tubular cutter 13 in the graphite block 22. During the reverse rotation of the flywheel 8, the device returns to its original position, and the supporting rod 1 is retrieved instead of the ones with graphite core 23 of the channel of the reactor stack.

The proposed design of the device allows you to ensure that the tubular cutter from the housing by up to 85% of the diameter of the hole or channel well that makes it possible to use this device when sampling from batches of industrial uranium-graphite reactors (PPR), which are characterized by a smaller diameter holes tracts channels graphite stack and thicker walls of the graphite blocks, relative to other types of uranium-graphite reactor (RBMK and so on).

The inventive device enables the taking of a holistic cores through the entire thickness of the graphite block at an angle of 90° relative to the axis location of a graphite block without the use of a variety of liquids, explosives, ways of "breaking", leading to the destruction of the core and the contamination of the graphite stack.

The device horizontal drilling cores from the borehole walls or channels containing the carrier arm is provided with a rotational drive, the tubular cutter, the rotation mechanism and the simultaneous filing of the tubular cutter, wherein the rotation mechanism and the simultaneous filing of a tubular cutter consists of a leading bevel gear interacting with mounted on the cutter driven hollow shaft, gears, and a stationary sleeve with an external thread, is placed in the cavity of the slave of the hollow gear shaft, and a tubular Frai is and is executed in the form of a sleeve with internal thread and is screwed on the fixed sleeve.



 

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