CN103556948B - Churn compaction drill bit - Google Patents

Abstract

The invention discloses a rotary punching and compacting drill bit, which is composed of a first hard alloy button, a drill body, a sealing cover, a lower joint, an anvil, a return spring, a second hard alloy button, a sealing ring, a third It is made of cemented carbide buttons, the drill body adopts single-head or multi-head conical helical cutting edges, and the first, second and third carbide buttons are inlaid and welded on the top of the cone and on the surface; the exhaust gas is arranged radially at the bottom of the drill body Holes and exhaust holes are used to cool the drill bit teeth and the outer surface of the drill bit; the anvil and the drill body are designed separately, and are connected by trapezoidal threads, which are well adapted to the rotary working conditions; the return spring makes the anvil return quickly without external load , cooperate with the impactor to maintain continuous anti-impact working conditions; the sealing cover and the drill bit body are interference fit and welded, and a fluorine rubber sealing ring is arranged between the sealing cover and the lower joint; It is suitable for formations such as frozen soil, sandy soil, and sandy pebble layer, and can obtain high drilling efficiency and good drilling quality.

Description

Rotary punching compaction drill bit

technical field

The invention relates to a compacting drill bit, in particular to a rotary compacting drill bit which cooperates with an impactor for impact rotary compaction drilling, and is applicable to strata such as frozen soil, sandy soil, sandy pebble layer and the like.

Background technique

Generally, the impact lance compacting hole forming technology is to apply an impact load to the drilled formation under the condition that the impact lance does not rotate, so as to realize drilling and forming holes. Compared with the impact lance compaction hole forming technology, the impact rotary compaction drilling technology not only applies impact force to the drill bit during the drilling process, but also applies rotational force to the drill bit. Under the joint action, the soil is squeezed into the formation, the drilling efficiency is high, and the drilling quality is good. The traditional impact compaction bit body only drills into the formation under the action of impact force and feeding force. The bit body usually adopts a stepped design structure to ensure impact compaction drilling; the bit body and the anvil are connected by cylindrical pins, and the structure Complicated and low reliability. The above-mentioned structure of the impact compaction drill bit is not suitable for rotary drilling conditions, and cannot be used in impact rotary compaction drilling with impact lances.

Contents of the invention

In view of the above problems, the present invention provides a rotary impact compaction drill bit suitable for percussion rotary compaction drilling conditions.

The present invention is made up of the first cemented carbide button, drill bit body, sealing cover, lower joint, anvil, return spring, the second cemented carbide button, sealing ring, the 3rd cemented carbide button, inside the drill bit body It has trapezoidal thread and anvil connection, the lower joint is sleeved on the anvil and docked with the drill body, the sealing cover is sleeved on the outer periphery of the drill body and the lower joint, a sliding sealing ring is set between the sealing cover and the lower joint, and the return spring is located on the anvil In the annular space formed by the lower joint, the first tungsten carbide button, the second tungsten carbide button and the third tungsten carbide button are welded on the surface of the drill body, and the first tungsten carbide button is arranged At the center of the end of the drill body, the second carbide button is arranged on the surface of the helical cutting edge of the drill body, and the third carbide button is arranged circumferentially at the end of the drill body; the tail of the lower joint is used to connect the impactor The lower part; the helical surface of the drill body has multiple spiral slag holding grooves and multiple vent holes, the vent holes are arranged in the center of the spiral slag containing groove, the vent holes are connected with the center through hole of the drill bit body, and the center through hole of the drill bit body Communicate with the center hole of the anvil.

The front end of the drill bit body is a conical section with a cone angle of 20-40°, the rear end of the drill bit body is a cylindrical section, and the cutting edge is a single-head or multi-head conical helical type. There is a certain ratio between the diameter and the length, and the pitch is 1-4 times the outer diameter of the drill.

Beneficial effects of the present invention:

When the rotary impact compacting drill bit cooperates with the impact lance to impact rotary compaction drilling, the second carbide button on the surface of the drill bit cuts the formation under the rotation of the drill body; the first carbide button and the third carbide button at the end of the drill bit body Under the impact load, the cemented carbide button crushes the pebbles and boulders in the formation and then squeezes them to the side wall; the broken rock slag chips are discharged to the cylindrical section of the bit body through the spiral slag holding groove, and the cylindrical section of the bit body will The rock debris is squeezed into the formation around the hole wall to realize compact drilling. The split design of the drill body and the anvil is connected by trapezoidal threads, which has high reliability, simple structure, and good adaptability to rotary working conditions. The connection form of the sealing cover, the drill bit body and the lower joint can realize the floating of the drill bit body, and prevent the gas from the inner channel of the impactor from escaping and the external rock debris from entering the impactor. The invention can cooperate with the impact spear to realize impact, rotary and compact drilling, and is suitable for strata such as frozen soil, sandy soil, sandy pebble layer, etc., improves the drilling efficiency and ensures the drilling quality.

Description of drawings

Fig. 1 is a schematic perspective view of the present invention.

Fig. 2 is a front view of the present invention.

Figure 3 is a sectional view of A-A in Figure 2.

Fig. 4 is the right view of the present invention;

FIG. 5 is a partial sectional view of FIG. 4 .

In the figure: 1—first carbide button, 2—drill bit body, 3—seal cover, 4—lower joint, 5—anvil, 6—return spring, 7—second carbide button, 8— Sealing ring, 9—exhaust hole, 10—spiral slag holding groove, 11—the third cemented carbide button.

Detailed ways

Please refer to Fig. 1, Fig. 2 and shown in Fig. 3, the present invention is made up of first cemented carbide button 1, drill bit body 2, sealing cover 3, lower joint 4, anvil block 5, return spring 6, second hard alloy Alloy button 7, sealing ring 8, third hard alloy button 11, drill bit body 2 has a trapezoidal thread to connect with anvil 5, lower joint 4 is set on anvil 5 and docked with drill bit body 2, sealed The cover 3 is set on the outer periphery of the drill bit body 2 and the lower joint 4, a sliding sealing ring 8 is arranged between the sealing cover 3 and the lower joint 4, the return spring 6 is located in the annular space formed by the anvil 5 and the lower joint 4, and the first hard The cemented carbide button 1, the second cemented carbide button 7 and the third cemented carbide button 11 are inlaid and welded on the surface of the drill body 2, the first cemented carbide button 1 is arranged at the center of the end of the drill body 2, and the second The second cemented carbide button 7 is arranged on the surface of the helical cutting edge of the drill body 2, and the third carbide button 11 is arranged circumferentially at the end of the drill body 2; the tail of the lower joint 4 is used to connect the lower part of the impactor. The helical surface of the bit body 2 has a plurality of helical slag holding grooves 10 and a plurality of vent holes 9, the vent holes 9 are arranged centrally in the helical slag containing groove 10, and the vent holes 9 communicate with the central through hole 12 of the bit body 2, The central through hole 12 of the drill body 2 communicates with the central hole 13 of the anvil 5 .

The front end of the drill bit body 2 is a conical section with a cone angle of 30°, the rear end of the drill bit body 2 is a cylindrical section, and the cutting edge is a single-head or multi-head conical helical shape. There is a certain ratio between the outer diameter and length of the drill bit, and the pitch is 1 to 4 times the outer diameter of the drill bit. For example, for a drill body with a diameter of 135mm and a cone angle of 30°, the pitch is selected to be 500mm. The rock slag chips broken during the drilling process are discharged to the cylindrical section of the drill bit body 2 through the spiral slag holding groove 10, and the cylindrical section of the drill bit body 2 squeezes the rock slag chips into the formation around the hole wall to realize compact drilling.

The first cemented carbide button 1 is located at the center of the bottom of the drill body; the second cemented carbide button 7 is vertical to the helical surface, and the helical surface is arranged in the center in the width direction, and arranged in several rows along the axis of the drill body; the third cemented carbide button The buttons 11 are circumferentially arranged at the bottom of the drill body. The arrangement of the teeth is shown in Figure 4 and Figure 5. The number of the third cemented carbide buttons 11 at the bottom, the distance from the centerline of the drill body, and the angle between the buttons are uniform. It should be determined according to the size of broken large-diameter pebbles or boulders and boulders. During the drilling process, the second cemented carbide button 7 on the surface of the drill bit body 2 cuts the formation under the rotation of the drill bit body 2; the first cemented carbide button 1 and the third carbide button 11 at the end of the drill bit body 2 Under the impact load, the pebbles and boulders in the formation are crushed and then squeezed to the side wall.

The bottom of the drill bit body 2 is arranged with a radial exhaust hole 9, which is close to the bottom of the drill bit body and centrally arranged in the spiral slag holding tank 10; the number and size combination of the exhaust holes can be set as Several combinations, the vent hole structure is reasonable, the number and size are appropriate. During the drilling process, part of the compressed air reaches the drill bit body 2 through the drill pipe and the impact lance, and is discharged through the radially arranged exhaust holes 9, and flows in the spiral slag holding groove 10 to cool the drill bit teeth and the outer surface of the drill bit.

As shown in Figure 3, the anvil 5 and the drill body 2 are designed separately, and the anvil 5 and the drill body 2 are connected by a trapezoidal thread instead of a cylindrical pin. The structure is simple, the reliability is high, and it is well adapted to the rotary working condition. and the anvil 5 is closely matched with the drill bit body 2, which is convenient for disassembly, maintenance and replacement.

As shown in FIG. 3 , the return spring 6 can make the anvil 5 return quickly even without external load, so as to ensure that the impactor does not run dry during the drill lifting process and maintains a continuous counterattack working condition.

As shown in Figure 3, the sealing cover 3 is interference fit and welded with the drill bit body 2 at its lower part; it is in clearance fit with the lower joint 4 at its upper part, and a sliding sealing ring 8 is arranged between the sealing cover 3 and the lower joint 4, and the sealing ring 8 The material is fluorine rubber. The connection form of the sealing cover 3, the bit body 2 and the lower joint 4 can ensure that after the anvil 5 bears the impact load of the piston, the sealing cover 3, the bit body 2 and the anvil 5 slide up and down relative to the lower joint 4 connected to the impactor , that is to realize the floating of the drill bit body 2; the sliding sealing structure can prevent the impact load, when the sealing cover 3, the drill bit body 2 and the anvil 5 move relative to the lower joint 4, the gas in the inner channel of the impactor escapes, and at the same time prevent the external rock slag Chips get inside the impactor.

The invention has strong adaptability under impact, rotary and compact drilling conditions, and can effectively cooperate with the impact spear to realize impact rotary compact drilling in frozen soil, sandy soil, sand and pebble layers, etc., with high drilling efficiency and good drilling quality .

Claims (3)

1. A rotary punching and compacting drill bit, characterized in that: it is composed of a first cemented carbide button (1), a drill body (2), a sealing cover (3), a lower joint (4), and an anvil (5) , return spring (6), second carbide button (7), sealing ring (8), third carbide button (11), the inside of the drill body (2) has a trapezoidal thread and an anvil (5 ), the lower joint (4) is set on the anvil (5) and docked with the drill bit body (2), the sealing cover (3) is set on the periphery of the drill bit body (2) and the lower joint (4), the sealing cover (3 ) and the lower joint (4) is provided with a sliding sealing ring (8), the return spring (6) is located in the annular space formed by the anvil (5) and the lower joint (4), the first carbide button ( 1), the second carbide button (7) and the third carbide button (11) are welded on the surface of the drill body (2), and the first carbide button (1) is arranged on the drill body ( 2) At the center of the end, the second carbide button (7) is arranged on the surface of the helical cutting edge of the drill body (2), and the third carbide button (11) is arranged circumferentially at the end of the drill body (2) ;The tail of the lower joint (4) is used to connect the lower part of the impactor; the helical surface of the drill body (2) has a plurality of spiral slag grooves (10) and a plurality of vent holes (9), the vent holes (9) Arranged centrally in the spiral slag container (10), the vent hole (9) communicates with the center through hole (12) of the drill body (2), and the center through hole (12) of the drill body (2) communicates with the anvil (5) The central hole (13) is connected. 2. A rotary punching and compacting drill according to claim 1, characterized in that: the front end of the drill body (2) is a conical section with a cone angle of 20-40°; the rear end of the drill body (2) It is a cylindrical section, and the cutting edge is a single-head or multi-head conical spiral. 3. A rotary punching and compacting drill bit according to claim 1, characterized in that the pitch of the spiral slag containing groove (10) is 1-4 times the outer diameter of the drill bit.