CN211819244U

CN211819244U - Expanding drill

Info

Publication number: CN211819244U
Application number: CN202020395124.5U
Authority: CN
Inventors: 王林; 陶刚; 王军
Original assignee: Jiangsu Green River Environmental Technology Co ltd
Current assignee: Jiangsu Green River Environmental Technology Co ltd
Priority date: 2020-03-25
Filing date: 2020-03-25
Publication date: 2020-10-30
Anticipated expiration: 2030-03-25

Abstract

A reamer comprises a coaxial central shaft and an outer casing drill, wherein the lower end of the central shaft is a drill bit or a positioning end, the outer casing drill is formed by a plurality of groups of connecting rod type drills with the same size, the groups of connecting rod type drills are uniformly distributed on the circumferential side of the central shaft, two drill arms connected by loose joints are formed by each connecting rod drill, the upper end of the upper drill arm of the connecting rod drill is fixed at the upper end of the central shaft and is movably fixed on a pin shaft, the upper end of the central shaft is provided with a shaft seat of the pin shaft, the lower end of the lower drill arm of the connecting rod drill is movably fixed at the lower end of the central shaft by a second pin shaft, a sleeve ring above the drill bit is sleeved on the central shaft, the sleeve ring is provided with the shaft seat of the; the outer side of the lower drill arm of the connecting rod drill is made of hard metal, especially a plurality of alloy blocks or an alloy steel bar are welded for cutting and drilling a rock layer, and common quenched steel can deal with common hard strata.

Description

Expanding drill

Technical Field

The utility model relates to a drilling tool that all kinds of building engineering foundation construction used especially relates to reamer bit.

Background

At present, in the large-diameter drilling construction of various buildings or projects such as remote transportation of traffic bridges to revetment and the like, a drilling tool with a large drill bit is needed, and particularly, the variable-diameter reinforcement cage invented by the applicant and the inventor has the requirement during construction, and the prior application patents of the applicant include but are not limited to: CN2017211488836, a variable-diameter steel reinforcement cage and an anchor rod, CN2017213763240, a bag expansion variable-diameter steel reinforcement cage and an anchor rod, CN2017211496584, CN2017208194362, a device for overcoming construction deformation of an anti-floating tensile anchor rod and the like. The diameter-variable steel reinforcement cage needs to be drilled at the lower end of the drilled hole before being placed into the drilled hole, and the large diameter of the diameter-variable steel reinforcement cage at the lower end is conveniently released. Therefore, when drilling, a hole expanding drill bit is needed to be used for hole expanding at the lower end, and a large-diameter drill hole is formed at the lower end, but if the lower end is a hard stratum, especially a rock stratum, the problem cannot be solved by the existing hole expanding drill bit, for example, CN 105909169 discloses a pile-forming rock-entering drill bit system of a rotary drilling rig, which comprises a hole expanding sleeve and a sleeve, wherein the front end of the hole expanding sleeve is embedded with hard alloy as a hole expanding head, and the hole expanding sleeve is installed on the hammer head of a pneumatic hammer through the sleeve. The rear end of the reaming sleeve is connected with the front end of the sleeve through a key groove, and the rear end of the sleeve is connected with the hammer through the key groove. The pneumatic hammer is characterized in that the maximum excircle of the pneumatic hammer is welded with an anti-sediment sleeve, the rear end of the pneumatic hammer is sleeved with a sheath, the front end of the sheath is arranged in the anti-sediment sleeve, the sheath and the anti-sediment sleeve are in clearance fit, and the height of the anti-sediment sleeve enables the sheath and the anti-sediment sleeve not to be separated when the pneumatic hammer acts in the maximum range. The rear end of the pneumatic hammer is connected with the rotary drilling rig through a switching joint. Hard alloy is embedded on the inner side and the outer side of the reaming sleeve.

CN 202866658U discloses an assembled reamer bit. Generally, the prior art has low efficiency, cannot achieve the expected effect, has large drill bit waste and is difficult to solve the problems in the construction of the invention.

The conventional rotary drilling rig mainly has the problems of difficult rock entering, low construction efficiency, high cost, difficult guarantee of pile hole quality and the like.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the purpose provides a can adopt the economic reliable drilling tool of digging rig adapted drilling rod soon and connecting, gives the drilling tool through drilling rod transmission axle pressure and gyration torsion, and drops into the drilling tool in general drilling diameter and can be at the underend reaming to provide the rotary drilling reaming to stereoplasm stratum or rock base, it is fast to go into the rock, and is with low costs, and it is big at the hole bottom gyration shearing force, and the straightness that hangs down in hole can be guaranteed, and can carry out the degree of depth and go into the rock.

In order to achieve the purpose, the utility model adopts the technical proposal that: a reamer comprises a coaxial middle shaft and an outer casing drill, wherein the lower end of the middle shaft is a drill bit or a positioning end, the outer casing drill is formed by a plurality of groups (2-8 groups, generally 4 groups) of connecting rod type drills with the same size which are uniformly distributed on the circumferential side of the middle shaft, two drill arms of each connecting rod drill are connected by loose joints, the upper end of the upper drill arm of the connecting rod drill is fixed at the upper end of the middle shaft and is movably fixed on a pin shaft, a shaft seat of the pin shaft is arranged at the upper end of the middle shaft, the lower end of the lower drill arm of the connecting rod drill is movably fixed at the lower end of the middle shaft by a second pin shaft, a ferrule above the drill bit is sleeved on the middle shaft, the shaft seat of the second pin shaft is arranged on the ferrule, and the ferrule; the outer side of the lower drill arm of the connecting rod drill is made of hard metal, particularly a plurality of alloy blocks or a (whole) alloy steel bar are welded for cutting and drilling a rock layer, and the general hardened steel can deal with general hard strata (rocks with lower differentiation degree).

The utility model discloses an improve and be equipped with a well axle sleeve, centraxonial axis is by the cover sleeve and can slide in the sleeve, and telescopic upper end is fixed in telescopic upper end to the upper end of the last drill boom of connecting rod drill, and the upper end of well axle sleeve is equipped with the axle bed of round pin axle. When the middle shaft sleeve is not used, the lowest end of the middle shaft faces downwards, the outer sleeve drill can work by shallow hole positioning, the lowest end of the middle shaft can be driven to a certain depth by a bald rod and the like, and the outer sleeve drill has an opening angle. The bald rod is made of materials and has a shape which can be advanced to a certain depth according to the construction object so as to open an angle.

The connecting rod drill is characterized in that a shaft seat is arranged at the upper end of a middle shaft, pin shafts (seats) are uniformly distributed on the side surface of the shaft seat, and a switching joint combined with a drill rod is arranged at the top end of the middle shaft. A plurality of (at least 2) steel connecting rod drills are uniformly distributed on the side surface of the middle shaft by pin shafts (seats). The top end of the middle shaft is provided with a switching joint combined with a drill rod; the adapter (connector) may be a sleeve-like structure, on which an internal thread and/or an external thread may be machined.

The middle shaft sleeve can be provided with a multi-gear sliding limiter for limiting the position of the middle shaft which is sleeved into the sleeve and can slide in the sleeve. Each group of connecting rods is straight after being folded. The length of the straight line of the connecting rod drill is not more than the longest length of the middle shaft which is sleeved into the sleeve and can slide outwards in the sleeve. The radius of the counterbore is of course no greater than half the length of the drill string.

The diameter of the ferrule is generally less than the length of the central shaft.

The bottom end of the middle shaft is provided with a conical drill, a single-chip drill or a multi-chip drill, and the cross section of the drill is a cross line, a Y line, or a positioning ring and a positioning rod.

The cross section of a lower drill boom of the connecting rod drill is rectangular, an alloy block or an alloy strip is welded on the lower surface of the drill boom, the upper end and the lower end of each steel pipe body are respectively provided with an internal thread and an external thread, and a plurality of (such as 2, 3, 4, 5 and 6) radial connecting rod drills are uniformly distributed on the periphery of a shaft seat of which the upper end and the lower end of the side surface of a middle shaft or a middle shaft sleeve are provided with pin shafts.

A pull rod or a pull rope 7 is arranged, one end of the pull rod or the pull rope is fixed with the upper end of the middle shaft, and the other end of the pull rod or the pull rope 7 is led out upwards from the middle shaft sleeve 5 and the hollow part of the drill rod.

The middle shaft 1, the middle shaft sleeve 5 and the pull rod or pull rope 7 can be omitted, and a simple reaming connecting rod drill is formed.

The utility model discloses also can install in pneumatic drilling rod, the axis then is the pneumatic hammer structure, still need bore the rotary drill with the connecting rod during nevertheless reaming, connects and digs the rig soon through the switching and is connected.

The length of the casing is made to the depth of penetration. The construction site dig the rig soon and the utility model discloses the connection process: the top end of a drill rod of the rotary drilling rig is connected with an air compressor, and when a pneumatic hammer is adopted as a front-end middle shaft of the rotary drilling rig, the rotary drilling rig is connected to the rear end of the pneumatic hammer through a middle shaft hole of the adapter.

The utility model discloses a working process: the middle shaft (the outer edge cutting part) is pressurized and rotated to drill a hole downwards, the outer side cutting edge of the outer casing drill starts cutting at a certain depth, namely, the hard alloy directly acts on the rock to drill, the drill rod applies downward force and rotary torque force to the drilling tool, the connecting rod drill at the lower end of the outer casing drill forms a taper angle to drill downwards,

has the advantages that: owing to adopt above-mentioned structure, the utility model discloses an install the reamer bit at the rotary drill drilling rod, the axis carries out the drilling with the carbide direct action rock of mantle drill (outer fringe cutting position), also can strike broken pore-forming in advance by the axis and bore soon again, makes like this that to go into that the rock is fast and the straightness that hangs down in hole is high, and the cliff is even, is applicable to higher hardness, the lower rock of differentiation degree enlarges the pore-forming, the utility model discloses epaxial even epaxial pore can attach input/output pipeline, as long as there is a preliminary drilling just can utilize the utility model discloses direct action carries out the reaming on the rock to rotatory steel reinforcement cage and release, drill bit and rock contact surface are less when reaming at every turn, and the resistance reduces, and it is efficient to bore, and drill bit body repeatedly usable is with low. The utility model provides an economical and reliable digs rig soon, go into the rock fast, the efficiency of construction is high, with low costs, stake hole is of high quality for dig rig function reinforcing in the pile foundation field soon.

Drawings

Fig. 1 is a schematic structural view of the outer drill when the outer drill is opened in operation.

Fig. 2 is a schematic top view of the expanding structure of the outer casing drill of the present invention.

FIG. 3 is a schematic view of the outer drill casing according to the present invention when retracted; at this point the outer casing drill has not begun reaming.

Fig. 4 is a schematic view of a reamer having the other end of a pull rod or pull string from the central sleeve 5 (the outer sleeve is in a collapsed state, the drill bit 1-1 is not used).

Fig. 5 is a schematic view of a reamer having the other end of a pull rod or pull string from the central sleeve 5 (with the drill bit 1-1 not in use in the expanded state of the outer casing).

Detailed Description

The present invention will be further described with reference to the accompanying drawings and the detailed description. As shown in fig. 1-5, the reamer comprises a central shaft 1 and an outer sleeve drill 2 which are coaxial, the lower end of the central shaft is a drill bit 1-1, the outer sleeve drill is formed by 2-6 connecting rod type drills with the same size which are uniformly distributed on the circumferential side of the central shaft, each connecting rod drill is formed by two drill arms which are connected by a loose joint 2-6 (also in a pin shaft structure), the upper end of an upper drill arm 2-1 of the connecting rod drill is fixed at the upper end of the central shaft, the lower end of a lower drill arm 2-2 of the connecting rod drill is movably fixed at the lower end of the middle shaft by a second pin shaft 2-5, a sleeve ring 3 of the middle shaft is sleeved above the drill bit, the sleeve ring 3 is provided with the shaft seat 3-1 of the second pin shaft, and when the sleeve ring slides on the middle shaft, each two drill arms of the connecting rod drill are driven to open or close; the outer side (edge) of the lower drill arm of the connecting rod drill is made of hard metal 2-3, and particularly a plurality of alloy blocks (which are welded on the cutting edge of the lower drill arm 2-2 of the connecting rod drill in a close-packed manner) or an alloy strip is welded on the cutting edge of the lower drill arm 2-2 of the connecting rod drill and used for cutting and drilling a rock layer, and the common hardened steel can cope with the common hard stratum. In addition, a middle shaft sleeve 5 is arranged, a middle shaft of the middle shaft is sleeved in the sleeve and can slide in the sleeve, the upper end of an upper drill arm of the connecting rod drill is fixed at the upper end of the middle shaft sleeve 5, and a shaft seat 1-2 of a pin shaft is arranged at the upper end of the middle shaft sleeve. The lower end of the sleeve 5 is provided with a ferrule 3, and the ferrule 3 is also sleeved on the middle shaft (rod) 1.

In the figure, 4 steel connecting rod drills (4 identical steel connecting rod drills, 2 steel connecting rod drills or 3 steel connecting rod drills are uniformly distributed on the column side of a middle shaft (a middle shaft sleeve), a disc is fixed at the upper end of the middle shaft (the middle shaft sleeve), a lug (pair of lugs) is arranged at each of the four equal parts of the circumference of the disc, holes are formed in the lugs to be shaft seats 1-2 of a pin shaft, the upper end of an upper drill arm 2-1 of the connecting rod drill is provided with a shaft hole, the pin shaft 2-4 is inserted into the upper end of the upper drill arm 2-1 to be provided with the shaft hole, the lugs are provided with holes, and the pin shaft can be riveted in the. When 3 steel connecting rods are drilled, three equal parts of the circumference of the disc are respectively provided with a (pair of) lug for mounting a pin shaft and the upper end of the upper drill arm 2-1 of the 3 steel connecting rod drill. The shaft seat 3-1 with the second pin shaft on the ferrule 3 can also adopt a structure similar to a lug. Two arms of the connecting rod can change angles in an adjustable mode, the pin shaft is made of alloy steel and is at least more than 4 mm, and strength is guaranteed. The upper drill arm of the connecting rod drill does not need to be welded with alloy steel.

The top end of the middle shaft is provided with an adapter joint 4 combined with a drill rod; the adapter (connector) 4 may be a sleeve structure, which may have internal and/or external threads, and may be a threaded screw connection or a falcon or keyway connection. The drill rod can be connected to the upper end to drive the drill rod (drill pipe) to rotate.

The middle shaft sleeve 5 (driven by the rotation of the drill rod barrel) drives the middle shaft 1 and the outer sleeve drill 2 to rotate, and the outer sleeve drill 2 is in a vertical position when the overlap of the middle shaft sleeve is minimum; the main purpose of the middle shaft 1 is not drilling, a shallow positioning hole is obtained or a hole is drilled downwards at a certain speed, the middle shaft sleeve 5 drives the outer casing drill 2 to rotate and slide downwards along a drill rod, the included angle between the lower drill arms 2-2 and 2-3 of the outer casing drill 2 and the horizontal plane is gradually reduced from 90 degrees, the drilling tool for cutting the hole is used for reaming when the outer lower side surfaces of the main lower drill arms 2-2 and 2-3 rotate, and the outer casing drill 2 forms the maximum reaming when the included angle is 25 degrees (the included angle can be manually set to be smaller or larger) as shown in figure 1; the pressure on the drill rod is controlled to ensure that the central shaft 1 drills downwards at a certain speed, and the outer casing drill 2 reams when correspondingly opened. When the soil layer is soft, the downward pressure of the middle shaft 1 is reduced.

The structure of setting the reaming size is as follows: the middle shaft sleeve 5 is provided with a multi-gear (a plurality of) sliding limiters which are used for limiting the position of the middle shaft which is sleeved into the sleeve and can slide in the sleeve, and the included angle between the lower drill arm 2-2 of the outer drill 2 and the horizontal plane can be adjusted; the drilling machine is characterized in that holes are formed in the side wall of a middle shaft sleeve 5 at different heights, holes are also formed in the side of the middle shaft, the holes and the positions, communicated with the holes in the middle shaft sleeve, of the holes are inserted through pins 6, a drill rod of a middle shaft 1 is limited in the middle shaft sleeve, the drill rod (pipe) of the middle shaft 1 is upwards limited in a blocking mode through the pins (steps or grooves are formed in the drill rod of the middle shaft 1 to form structural members such as a shaft connecting piece), the length of a hole expanding sleeve is carried out according to the force transmission strength such as the diameter and the depth of a drilled hole, the length of a sleeve is guaranteed according to the transmission of rotation torque when the drill rods are overlapped in the middle shaft sleeve, the bottom end of the middle shaft particularly adopts a; the positioning of the middle shaft can not easily form a hole when the middle shaft meets an excessively soft soil layer; the sleeve of the whole middle shaft 1 and the outer drill sleeve 2 are prevented from being brought into the easy-to-form hole when the hole is formed easily, and the positioning and reaming are prevented from being influenced; especially the diameter design of the ferrule 3 is limited.

Under the condition, each connecting rod drill is a straight line after being folded, and the maximum length of the connecting rod drill when the connecting rod drill is straight is not more than the maximum length of the middle shaft which is sleeved into the sleeve and can slide outwards in the sleeve.

The diameter of the ferrule is generally smaller than the length of the middle shaft, and the drill at the front end of the middle shaft can be a conical drill, particularly a single-piece drill or a multi-piece drill, and the cross section of the drill can be a cross wire or a Y-shaped wire. The axis front end bores especially adopts round platform shape or grenade shape cross-section, is bored to the quilt of different hardness or rock soil to the object, and the shape of axis brill changes to some extent, generally, the utility model discloses an object is the rock that has certain morals and manners degree, and the rock that does not have the morals and manners is used the utility model discloses the efficiency of drilling tool is not calculated the ideal, when having the rock of certain morals and manners degree or hard soil to mix with soft soil, the utility model discloses the axis should adopt blunt brill.

In order to make the utility model wider in adaptation surface, the utility model designs a pull rod or a pull rope 7, one end of the pull rod or the pull rope is fixed with the upper end of the middle shaft, and the other end of the pull rod or the pull rope 7 is led out from the middle shaft sleeve 5 and the hollow part of the drill rod upwards, so that a worker on the operation surface can pull and lift the middle shaft, and the middle shaft can not easily form a hole when encountering an excessively soft soil layer; the sleeve of the whole middle shaft 1 and the outer drill sleeve 2 are prevented from being brought into the easy-to-form hole when the hole is formed easily, and the positioning and reaming are prevented from being influenced; especially the diameter design of the ferrule 3 is limited. The drill at the front end of the middle shaft can be omitted.

The upper end and the lower end of each steel pipe body are respectively provided with an internal thread and an external thread, and a plurality of (such as 2, 3, 4, 5 and 6) radial connecting rod drills are uniformly distributed on the periphery of the middle shaft or the middle shaft sleeve.

Claims

1. A reamer is characterized by comprising a coaxial middle shaft and an outer casing drill, wherein the lower end of the middle shaft is a drill bit or a positioning end, the outer casing drill is formed by a plurality of groups of connecting rod type drills with the same size, which are uniformly distributed on the circumferential side of the middle shaft, two drilling arms connected by loose joints are formed by each connecting rod drill, the upper end of the upper drilling arm of the connecting rod drill is fixed at the upper end of the middle shaft and is movably fixed on a pin shaft, the upper end of the middle shaft is provided with a shaft seat of the pin shaft, the lower end of the lower drilling arm of the connecting rod drill is movably fixed at the lower end of the middle shaft by a second pin shaft, a ferrule above the drill bit is sleeved on the middle shaft, the ferrule is provided with a shaft seat of the second pin shaft; the outer side of the lower drill arm of the connecting rod drill is made of hard metal.

2. The reamer as claimed in claim 1, wherein a central shaft sleeve is provided, a central shaft of the central shaft is inserted into the sleeve and can slide in the sleeve, an upper end of the upper drill arm of the connecting rod drill is fixed to an upper end of the sleeve, and an upper end of the central shaft sleeve is provided with a shaft seat of the pin shaft.

3. The reamer as claimed in claim 1 or 2, wherein the connecting rod drill is formed by uniformly distributing shaft seats provided with pin shafts at the upper end of the side surface of the central shaft, and the top end of the central shaft is provided with an adapter joint combined with the drill rod.

4. The reamer of claim 2, wherein the central sleeve is provided with a multi-step sliding stop for limiting the position at which the central shaft is inserted into the sleeve and can slide within the sleeve.

5. The reamer of claim 1 or 2, wherein each set of connecting rods is straight after being collapsed.

6. The reamer of claim 1, wherein the diameter of the collar is less than the length of the central shaft.

7. The reamer as claimed in claim 1 or 2, wherein the bottom end of the central shaft is a taper drill, a single-piece drill or a multi-piece drill, the cross section of the drill is a cross line or a Y line, and the bottom end of the central shaft is a positioning ring or a positioning rod.

8. The reamer as claimed in claim 1 or 2, wherein the cross-section of the lower arm of the connecting rod drill is rectangular, an alloy block or an alloy strip is welded to the lower surface of the lower arm, and the upper end and the lower end of each steel pipe body are respectively provided with an internal thread and an external thread.

9. The reamer as claimed in claim 1 or 2, wherein a pull rod or a pull rope is provided, one end of the pull rod or the pull rope is fixed to the upper end of the central shaft, and the other end of the pull rod or the pull rope is led out upward from the hollow of the central shaft sleeve and the drill rod.