JPH04500105A - drilling tools - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] drilling tools field of invention The present invention relates to mining technology, and more particularly to equipment used in excavation. Book The invention is used in mining technology to drill into wells without raising the drill string. This is done by lowering the core pit and raising it out of the well. It can be used most advantageously during core testing.

Background of the invention In a drilling tool that operates on the same principle as the device of the present invention, rock drilling is carried out in a core pit. This is done during the rotation of the The reliability of the drilling tool during its operation depends on the torque from the outer tube to the core pit. Dependent. This reliability is guaranteed by different measures in different structures .

Drilling including an outer tube, an inner tube and a removable segmented core pit A tool is known (US Pat. No. 3,692,126). Tapered part on the inside A hole is provided on the surface of the outer tube. This drilling tool is in its working position When the tapered surface of the sectioned section of the removable core pit Fits into the tapered hole above and transfers torque from the outer tube to the core by friction during drilling The signal is transmitted to divided parts (segments) of the pit. Shigashi top The friction-based single-taper connection described above is unreliable and, for example, lubricant particles in the drilling fluid When entering this joint, or the torque of core pit friction against the rock tapers. Torque transmitted from the outer tube to the segmented core pit by a friction connection Tendency to slip during excavation of abrasive or fissured rocks when There is.

Furthermore, an outer tube and a removable segmented core pit are provided. The divided parts (segments) of the existing core pit are expanded and fixed. Drilling tools are known that include an inner tube that has an inner tube. outer tube face and Inside the face of the core pit segment are located on the axial plane and interlock with each other. Teeth are provided to transmit torque from the outer tube to the segments of the core pit. (U.S. Pat. No. 3,603,413). The positioning guide is relative to the teeth on the outer tube. Used to obtain the required position of the segmented core pit teeth. Said positioning The guides are located on the inner surface of the core pit segment carrier plate and on the inner surface of the outer tube. and a set of mutually contacting cams located in a lower position. core pit The top end of each cam located on the surface of the segment's carrier plate is connected to the core pit segment. must be aligned with the center of the tooth located on the face of the The top end of each cam that lies on the surface is aligned with the center of the tooth that lies on the surface of the outer tube. There must be. This ensures that the teeth on the outer tube and core pit segment This is a condition for engagement.

When the drilling tool is in the working position, on the surface of the carrier plate of the sectioned core pit The top ends of the provided cams are connected to the air space between adjacent cams provided in the lower portion of the outer tube. Must be located inside the cave. This arrangement structure of positioning guide is outside Guarantees the necessary placement of the segmented core pit against the tube teeth inside the tube to ensure that the necessary engagement is obtained in the process of lowering the .

The presence of the above positioning guide in the drilling tool makes its structure more complex. .

Furthermore, the unavoidable errors that occur during the manufacturing process of the positioning guide are caused by the fact that this guide is operating. A “dead area” may form on the top of the contact cam while the This will cause the cam to seize at the position corresponding to the closed area. This seizure occurs on each side of the cam. This is caused by dirt on the surfaces, which further reduces the movement of the cams relative to each other. make it difficult The seizure will lead to failure of the positioning guide and therefore It also prevents unreliable meshing between the teeth of the segmented core pit and the teeth of the outer tube. This can lead to destruction and failure of drilling tools during long-term use.

Disclosure of invention The purpose of the invention is to improve the reliability of the engagement of the outer tube with the segments of the core pit. provide a drilling tool having a core pit segment manufactured to This is achieved by simplifying the structure of the drilling tool and improving its operational reliability. For the main purpose of A tube, an inner tube, and teeth adapted to mesh with teeth on the outer tube. a removable segmented core pit having segments provided with In a drilling tool according to the present invention, the teeth of the core pit segment are aligned with the shaft of the drilling tool. arranged circumferentially with respect to the line and also have a hardness lower than that of the material of the teeth of the outer tube. A drilling tool is provided that is made from a material having.

Such embodiments of the core pit segment teeth are made from materials of high hardness. The outer tube teeth are made of a material with a hardness lower than that of the material of the outer tube teeth. Preserves the formation of the transmission action based on cutting into the teeth of the created core pit segment. This transfer effect is due to the fact that the axial load of the drilling tool on the bottom of the hole is (operation) value is reached. This allows a high coefficient of engagement to be achieved on the outer tuner. between the teeth of the core pit segment and the teeth of the core pit segment, so that the outer tube and Increases the reliability of engagement with the divided core pit and therefore also the operation of the drilling tool reliability can be improved.

, Furthermore, the above-mentioned high engagement reliability eliminates the need for positioning guidance; This simplifies the structure of the drilling tool.

Removable core pit with radial flange on the outer surface of the inner tube Arranged between the segments, the sides and the removable core pit segment are mutually connected. It is desirable to have an effect.

While this drilling tool is in use, the teeth on the outer tube become worn and must therefore be removed. The degree of penetration into the teeth of the free core pit segment is reduced, and this is particularly When drilling fissured rocks, the outside chisel is against the teeth of the core pit segment. The tube teeth start to slip. This slippage also affects the core pit of the teeth on the outer tube. Occurs early in excavation when the segment is incompletely inserted into the tooth. inside A radial flange on the outside of the tube eliminates any possibility of slipping. Therefore, the operational reliability of the drilling tool can be increased.

Brief description of the drawing The invention will be further described below by reference to specific embodiments in connection with the accompanying drawings. Described in detail. FIG. 1 shows the excavation tool of the present invention in the operating position during excavation. cross section, FIG. 2 is a view of a portion of the drilling tool in the transport position during the descent of the partial core pit; Figure 3 shows a portion of the drilling tool in the transport position during the ascent of the split core pit. figure, Figure 4 is a view taken along arrow A in Figure 1, and Figure 5 is a view taken along arrow B in Figure 3. Figure 6 is a view of the core pit section taken along arrow C in Figure 1 before the start of the excavation action. figure, Figure 7 is a view of the core pit section after the start of the excavation action, taken along arrow C in Figure 1; Figure 8 shows the inner tube radial flange and core pit along line ■-■ in Figure 8. Figure 9 shows the mutual arrangement structure between the core pit part and the inner tube half. Figure 8 is a view similar to Figure 8 at the moment of interaction with the radial flange;

BEST MODE FOR CARRYING OUT THE INVENTION The excavation tool consists of an outer tube 1 (Fig. 1) and an inner tube 2 housed therein. Equipped with: Body with segments on the outer surface 3 of the inner tube 2 4 is provided. Both the main body 4 and the segment 5 have a segmented core pit 4.5. Form. The inner tube 2 has a sectioned core pit 4, 5 or a core pit. It is mounted inside the drilling tool so that it can move along the axis of the drilling tool.

A flange 6 (Figures 2 and 3) is provided on the outer surface of the segment 5, and a hole 7 is provided on the outer surface of the segment 5. Provided in the lower part of the side tube 1, when the drilling tool is in its working position, the segment The flange 6 of the seat 5 is locked inside the hole 7.

A protrusion 8 is provided on the inner surface of the segment 5 so that when the drilling tool is in its working position the inner chi The tube 2 is locked to this protrusion.

Located on the inner tapered surface 9 (Fig. 1) of the surface portion of the outer tube 1 on the axial plane Longitudinal teeth 10 (FIG. 2) are provided. Removable core pit 4 , 5 to engage with the teeth 10 of the outer tube 1. It has teeth 11 that are . Teeth 11 of segment 5 are attached to the drilling bit (Fig. 6). arranged circumferentially relative to the longitudinal axis and of a lower hardness than the material of the outer tube teeth. Manufactured from materials with a high degree of

The upper part of the inner tube 2 has a suspension having a pawl 13 and a gripper 14. It is rigidly connected to a suspension (sling) 12. The pawl 13 is provided on the outer tube 1 Located inside the recess 15, the inner tube is This is to prevent the knob 2 from moving upward. Furthermore, the inner tube 1 and the outer tube The pawl 13 interconnecting the tube 2 transfers torque from the outer tube 1 to the inner tube. It functions to transmit information to the tube 2.

The lower part of the inner tube 2 has segments of core pits 4, 5 on its outer surface 3. 5 is provided with a radial flange 16 (FIGS. 8 and 9) disposed between the The side surface 17 allows interaction with the side surface 18 of the segment 5 of the core pit 4.5. I'm doing it. The flange 16 prevents wear of the teeth 10 provided on the outer tube 1. As a result, when it slips against the teeth 11 provided in the divided core pits 4 and 5, the torque from the rotating inner tube 2 to the divided core pit 4.5. used for. The flange 16 also connects the core pit 4 of the tooth 10 of the outer tube 1. At the beginning of the digging action when the interruption of the teeth 11 of the segment 5 of 5 was incomplete Also, during excavation of highly fractured rock, torque is transferred from the inner tube 2. Transfer to sectioned core pit 4.5.

An annular groove 19 is provided in the lower part of the outer f73 of the inner tube 2, and the core is divided into sections. The body 4 of the pits 4, 5 has a hole for drilling tools inside the divided core pit 4.5. an elastic strut that can be bent to one side or the other during movement of the tube 2 along the axis; A buffer means 20 is provided. The inner tube 2 is placed above the divided pit 4゜5. When the stop means 20 sinks into the annular groove 19 (FIG. 3), Both the inner tube 2 and the divided core pit rise upward at the same time. can be engaged.

The plate-like part of the segment 5 of the core pit 4.5 exhibits elasticity, thereby The movement of the tube 2 inside the divided core pits 4 and 5 when the segment 5 moves apart. to be able to come to the operating position during movement.

A core gripper 21 is provided in the lower part of the inner tube 2 .

The segment 5 of the core pit 4.5 has a surface on its surface, for example in the form of a diamond matrix. It has a cutting element 22.

This drilling tool operates as follows.

The inner tube 2 has a hole inside the outer tube 1 along with segmented core pits 4 and 5. is lowered towards the bottom of the During this movement, the inner tube 2 The core pit 4.5 is abutted against the elastic stopper means 20 of the body 4 of the core pit 4.5. Press it and move downward together with the main body 4.

In this lower position, the segments 5 move apart due to their elasticity and the flanges The tube 6 is fitted inside the hole 7 of the outer tube 1, and the divided core pit 4.5 stops. However, the inner tube 2 continues to move downward inside the core pit 4.5. The elastic stopper means 20 of the main body 4 and the segment 5 of the core pit 4.5 are separated. I will do it. This movement of the inner tube 2 is controlled by a protrusion 8 provided on the segment 5. When the tube 2 comes into contact with these protrusions, the movement of the tube 2 is stopped. .

When the inner tube 2 stops, the suspension 12 provided on the inner tube 2 A pawl 13 is located in a recess 15 in the outer tube 1. This is from outer tube 1 To ensure the transmission of torque to the inner tube 2. In this position, the drilling tool is Preparations are made.

When the bottom is reached, a longitudinal section provided in the outer tube 1 and made of a material of high hardness A facing tooth 10 is provided in the segment 5 of the core pit 4.5 and is made of a material of low hardness. It cuts into the annular teeth 11 that have been formed, thereby achieving interlocking of these teeth. .

At the start of drilling, the axial load of the drilling tool on the bottom is still at its nominal (working) value is not reached and tooth 10 of outer tube 1 is set in segment 5 of core pit 4.5. If the tube 1 has not penetrated into the core pin 11 enough, There remains the possibility of a brief slip for segment 5 of 4.5. To Tsume 13 Therefore, the inner tube 2 connected to the outer tube 1 rotates together with the outer tube 1. do. As the inner tube rotates, the radial flange 16 provided on the tube now touches segment 5 of core pit 4.5, rotating the core pit. Therefore, torque is transmitted from the inner tube 2 to the core pits 4 and 5 (Fig. 9). ). In this way, the possibility of slipping mentioned above is eliminated and the operational reliability of the drilling tool is improved. will improve.

At the open bottom the segmented core bits 4, 5 are maintained in contact with the inner tube 2. The axial load of the drilling tool on the outer tube reaches its nominal (working) value and Complete engagement between tooth 10 of segment 1 and tooth 11 of segment 5 of core bits 4 and 5 is achieved. will be accomplished. Here the torque is directly transmitted from the outer tube 1 to the core bit 4.5. Ru. This occurs between the outer tube 1 and the segmented core bits 4 and 5. Also provided on the outer tube 1 are teeth 10 made of a material of high hardness that are connected to the core. The hardness is lower than the hardness of the material of the teeth 10 provided on the bits 4 and 5 and provided on the tube 1. This is achieved by the formation of a transmission action by cutting into the teeth 11 made from the same material. will be accomplished. A high rate of engagement between teeth IO and 11 is achieved, which In order to increase the reliability of the engagement between the tube 1 and the segmented core bit 4.5, Therefore, it is possible to improve the operational reliability of the excavation tool.

High reliability of engagement between outer tube 1 and segmented core bit 4.5 for positioning To eliminate the need to provide a guide, thereby simplifying the structure of the excavation tool.

Figure 7 shows that the teeth 11 provided on the segment 5 of the core bits 4 and 5 are removed after the start of drilling. 2 shows the deformation of the tooth 11 when interacting with the tooth 10 of the side tube 1;

Drilling of the hole is carried out by means of a drilling tool held in its above-mentioned position. rotation is out transmitted to the side tube 1. During drilling, the core fills the inner 1 tube 2. Chew Any movement of the inner tube 2 caused by the movement of the core inside the tube is now is blocked by a pawl 13 fixed inside a recess 15 in the outer tube 1.

After the core fills the inner tube 2, the outer tube 1 stops rotating and the drilling tool With the help of the lifted core gripper 21, the core is separated from the bottom. After that, the gripping tool 14 A gripping device (not shown to avoid complicating the drawing) that can be connected to the core is used to Allow the filled tube 2 to be withdrawn. In this process, the inner tube The upward movement of web 2 begins with the segmented core bit being held stationary. This is done inside 4 and 5. The annular groove 19 provided in the inner tube 2 is segmented. is in contact with elastic stopper means 20 provided on the body 4 of the core bit 4.5. At this time, the stopper means 20 sinks into the groove 19 and the core bit separated from the inner tube 2. 4 and 5 to ensure the rising of the joint.

Industrial applicability The present invention enables digging without raising the digging vibe string in mining operations. The cutting bit or diamond tool is lowered into the drilled hole or raised out of the drilled hole. It can be used with maximum advantage during core drilling carried out by .

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Claims (2)

[Claims] 1. an outer tube having on its surface part a number of teeth (10) located on an axial plane; The tube (1), the inner tube (2), and the teeth (10) of the outer tube (1) engage. Removal with segments (5) provided with matching teeth (11) In a drilling tool comprising a freely segmented core bit (4, 5), the removal Teeth (1) provided in the segment (5) of the free segmented core pit (4, 5) 1) are arranged circumferentially with respect to the axis of the drilling tool and also in the outer tube (1). made of a material having a hardness lower than that of the material of the teeth (10) provided A drilling tool characterized by: 2. The outer surface (3) of the inner tube (2) has a removable segmented core bit ( A radial flange (16) located between the segments (5) of the segments (4, 5) is provided. of the removable segmented core bit (4, 5) by its sides (17). ensuring that the interaction of the segment (5) with the side surface (18) is ensured; The excavation tool according to claim 1, characterized in that: