Secondary reamer bit with centralizing device

Abstract

The utility model belongs to the technical field of drill bits, particularly relates to a secondary reamer bit with a centralizing device, and provides the following scheme aiming at the problems that the existing reamer bit does not drill along the track of an original hole, so that a drill hole deviates, and the drill hole is scrapped, the secondary reamer bit comprises a reamer body, and the outer surface of the reamer body is provided with a slag discharge groove; a guide mechanism for guiding the drill bit is arranged at one end of the reamer body; the guide mechanism comprises a guide rod, the guide rod is fixed at one end of the reamer body, a guide drill bit is fixed at the front end of the guide rod, a connecting rod is fixed at the rear end of the guide rod, and a connecting hole formed in the guide rod is connected to the rear end of the connecting rod in an inserted mode. And the guide drill bit firstly makes contact with the inner wall of a hole needing to be reamed, and then the guide effect is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a secondary reaming drill bit, concretely to a secondary reaming drill bit with a centralizing device, belongs to drill bit technical field. BACKGROUND

[0002] A secondary reaming drill bit is a special drill bit that can drill a hole again in an already drilled hole to enlarge the hole diameter or improve the hole accuracy and surface quality. The working principle of the secondary reaming drill bit is based on the combination of axial force and rotational force. During the reaming process, the drill bit rotates and cuts through hard alloy or steel cutting edges, gradually expanding the existing hole diameter. The design of the reaming drill bit usually includes multiple cutting teeth to achieve efficient material removal and ensure the accuracy and smoothness of the hole.

[0003] In the prior art, as disclosed in the reaming drill bit with publication number CN208364056U, it includes an upper fixing part, at least two telescopic drill claws, a rotating part and a lower fixing part. The upper fixing part is provided with at least two receiving grooves, and the at least two telescopic drill claws are received in the at least two receiving grooves. The rotating part is received in the lower fixing part, and the upper fixing part is fixedly connected with the lower fixing part. The telescopic drill claw includes a clamping part, and the rotating part includes a connecting part. The clamping part is screwed to the rotating part to make the at least two telescopic drill claws rotate relative to the connecting part. It adjusts the rotating part to make the telescopic drill claws rotate along the connecting part, so that the telescopic drill claws are in an expanded state. According to the hole forming requirement, the rotation direction of the drill rod is adjusted, so that the drilling can be carried out. It is convenient to install and disassemble, and can meet the hole forming requirements of different hole diameters.

[0004] Although the above technical solution adjusts the rotating part to make the telescopic drill claws rotate along the connecting part, so that the telescopic drill claws are in an expanded state, and drilling can be carried out, the geological conditions are relatively complex, and the hole collapse phenomenon often occurs in the hole. The reaming drill bit is easy to drill into the original hole track, which causes the drilling deviation and leads to the drilling scrap. In view of this, a secondary reaming drill bit with a centralizing device is provided to overcome the above defects. UTILITY MODEL CONTENTS

[0005] The utility model provides a secondary reaming drill bit with a centralizing device to solve the problem that the reaming drill bit is easy to drill into the original hole track, which causes the drilling deviation and leads to the drilling scrap.

[0006] The utility model realizes the above-mentioned purpose through the following technical scheme: a secondary reaming drill bit with a centralizing device, including a reaming drill body, a slag discharge groove is formed on the outer surface of the reaming drill body, and a guiding mechanism for guiding the drill bit is arranged at one end of the reaming drill body.

[0007] The guiding mechanism comprises a guiding rod fixed at one end of the reamer body, a guiding drill bit fixed at the front end of the guiding rod, and a connecting rod fixed at the rear end of the guiding rod, and the rear end of the connecting rod is connected with a connecting hole formed in the guiding rod.

[0008] As a further scheme of the present utility model: the upper surface of the connecting rod is provided with a fixing hole, and the fixing hole is connected with a fixing bolt in plug-in connection and in threaded connection with the guiding rod.

[0009] As a further scheme of the present utility model: the rear end of the reamer body is fixed with a transmission rod, and the outer surface of the transmission rod is sleeved with a fixed bearing.

[0010] As a further scheme of the present utility model: the inner wall of the fixed bearing is symmetrically fixed with two limiting blocks, the outer surfaces of the two limiting blocks are both slidably connected with a guiding groove formed on the transmission rod, and the outer surface of the fixed bearing is provided with a limiting mechanism for assisting in limiting the drill bit.

[0011] As a further scheme of the present utility model: the limiting mechanism comprises a mounting shell fixed on the outer surface of the fixed bearing.

[0012] As a further scheme of the present utility model: the inner part of the mounting shell is symmetrically fixed with two fixed blocks.

[0013] As a further scheme of the present utility model: the two sides of the two fixed blocks are both fixed with drive electric cylinders through screws, and the telescopic end of the drive electric cylinder is fixed with a clamping block.

[0014] The present utility model has the beneficial effects that: the reamer body is driven to rotate by the driving device, the reamer body is driven to feed, the guiding drill bit first contacts the inner wall of the hole to be reamed, and the guiding effect is realized.

[0015] The fixed blocks arranged in the mounting shell can drive the clamping blocks to move under the action of the drive electric cylinders, so that the two clamping blocks contact the inner wall of the upper end of the hole, the transmission rod is uprightly limited, the guiding groove formed on the transmission rod can play a guiding role under the cooperation of the limiting blocks, and the fixed bearing arranged on the transmission rod can ensure that the transmission rod does not drive the mounting shell to rotate when rotating, thereby ensuring the normal upright effect. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a schematic diagram of the three-dimensional structure of the present utility model;

[0017] Figure 2 It is a schematic diagram of the sectional structure of the mounting shell of the present utility model;

[0018] Figure 3The utility model discloses a three-dimensional structure schematic view of guide rod

[0019] Figure 4 The utility model discloses Figure 1 The enlarged view of A in the middle.

[0020] In the drawing: 1, the reamer body; 2, the slag discharge groove; 3, the guide rod; 31, the guide drill bit; 32, the connecting rod; 33, the connecting hole; 34, the fixed hole; 35, the fixed bolt; 4, the transmission rod; 5, the fixed bearing; 6, the limiting block; 7, the guide slot; 8, the mounting shell; 81, the fixed block; 82, the drive electric cylinder; 83, the clamping block. DETAILED DESCRIPTION

[0021] The technical scheme in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model and not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor belong to the range protected by the utility model. Embodiment one

[0022] As Figures 1 to 4 Illustrated, a kind of secondary reamer with righting device, including reamer body 1, the outer surface of reamer body 1 is equipped with slag discharge groove 2, the one end of reamer body 1 is equipped with the guide mechanism for guiding drill bit;

[0023] Guide mechanism includes guide rod 3, guide rod 3 is fixed in the one end of reamer body 1, the front end of guide rod 3 is fixed with guide drill bit 31, the rear end of guide rod 3 is fixed with connecting rod 32, the rear end of connecting rod 32 is insertedly connected with connecting hole 33 equipped in guide rod 3 interior, the upper surface of connecting rod 32 is equipped with fixed hole 34, fixed hole 34 is insertedly connected with fixed bolt 35 with the screw connection of guide rod 3, the rear end of reamer body 1 is fixed with transmission rod 4, the outer surface of transmission rod 4 is equipped with fixed bearing 5, by the transmission rod 4 set on reamer body 1, the output shaft of drive equipment is fixed with transmission rod 4, so that drive equipment drives reamer body 1 to rotate, while driving reamer body 1 to feed, guide drill bit 31 is contacted with the hole inner wall needing reaming first at this time, to realize guiding effect, and reamer body 1 is contacted with hole, to realize reaming effect. Embodiment two

[0024] In addition to comprising all the technical features in embodiment one, the embodiment comprises: the inner wall of the fixed bearing 5 is symmetrically fixed with two limiting blocks 6, the outer surfaces of the two limiting blocks 6 are both slidably connected with a guide groove 7 opened on the transmission rod 4, the outer surface of the fixed bearing 5 is provided with a limiting mechanism for assisting in limiting the drill bit, the limiting mechanism comprises a mounting shell 8 fixed on the outer surface of the fixed bearing 5, the inside of the mounting shell 8 is symmetrically fixed with two fixed blocks 81, the two sides of the two fixed blocks 81 are both fixed with a drive electric cylinder 82 through a screw, the telescopic end of the drive electric cylinder 82 is fixed with a clamping block 83, when the reamer body 1 is deep into the hole, the drive equipment stops driving, at this time, under the action of the drive electric cylinder 82, the clamping block 83 can be driven to move through the fixed blocks 81 arranged in the mounting shell 8, so that the two clamping blocks 83 contact with the inner wall of the upper end of the hole, thereby limiting and righting the transmission rod 4, through the guide groove 7 opened on the transmission rod 4, the limiting block 6 can play a guiding role under the cooperation of the limiting block 6, and through the fixed bearing 5 arranged on the transmission rod 4, the rotation of the transmission rod 4 can not drive the mounting shell 8 to rotate, so as to ensure the normal righting effect, the drive equipment drives the reamer body 1 to rotate and feed again, the slag discharge groove 2 arranged on the reamer body 1 facilitates the discharge of soil residue, when the guide drill bit 31 is damaged, the fixed bolt 35 on the guide rod 3 can be unscrewed, so that the fixed bolt 35 is separated from the fixed hole 34, under the cooperation of the connecting hole 33 and the connecting rod 32, the guide drill bit 31 can be disassembled.

[0025] Working principle: before using the secondary reaming drill bit with righting device, the drill bit is connected with the output shaft of the drive equipment, the transmission rod 4 arranged on the reamer body 1 is fixed with the output shaft of the drive equipment, so that the drive equipment drives the reamer body 1 to rotate and feed at the same time, at this time, the guide drill bit 31 first contacts with the inner wall of the hole which needs to be reamed, thereby realizing the guiding effect, and after the reamer body 1 contacts with the hole, the reaming effect is realized, when the reamer body 1 is deep into the hole, the drive equipment stops driving, at this time, under the action of the drive electric cylinder 82, the clamping block 83 can be driven to move through the fixed blocks 81 arranged in the mounting shell 8, so that the two clamping blocks 83 contact with the inner wall of the upper end of the hole, thereby limiting and righting the transmission rod 4, through the guide groove 7 opened on the transmission rod 4, the limiting block 6 can play a guiding role under the cooperation of the limiting block 6, and through the fixed bearing 5 arranged on the transmission rod 4, the rotation of the transmission rod 4 can not drive the mounting shell 8 to rotate, so as to ensure the normal righting effect, the drive equipment drives the reamer body 1 to rotate and feed again, the slag discharge groove 2 arranged on the reamer body 1 facilitates the discharge of soil residue, when the guide drill bit 31 is damaged, the fixed bolt 35 on the guide rod 3 can be unscrewed, so that the fixed bolt 35 is separated from the fixed hole 34, under the cooperation of the connecting hole 33 and the connecting rod 32, the guide drill bit 31 can be disassembled, which is convenient for replacement.

[0026] It will be obvious to a person skilled in the art that the application is not limited to the details of the above-described exemplary embodiments, but that the application can be implemented in other concrete forms without departing from the spirit or essential characteristics of the application. The embodiments should, therefore, be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the above description, and all changes which come within the meaning and range of equivalents of the claims are therefore intended to be embraced therein. Any reference signs in the claims should not be construed as limiting the scope of the claims concerned.

[0027] Furthermore, it should be understood that although the present specification describes exemplary embodiments, the application is not limited to only one independent technical solution in each embodiment, and the specification is described in this way only for the sake of clarity. A person skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that a person skilled in the art can understand.

Claims

1. A reaming head with a centralizer, comprising a reamer body (1), characterized in that: The outer surface of the reamer body (1) is provided with a slag discharge groove (2), and one end of the reamer body (1) is provided with a guide mechanism for guiding the drill bit. The guide mechanism comprises a guide rod (3) fixed at one end of the reamer body (1), a guide drill bit (31) fixed at the front end of the guide rod (3), and a connecting rod (32) fixed at the rear end of the guide rod (3), and the rear end of the connecting rod (32) is insertedly connected with a connecting hole (33) formed in the guide rod (3).

2. The underreamer bit with a stabilizing device of claim 1, wherein: The upper surface of the connecting rod (32) is provided with a fixing hole (34), and the inside of the fixing hole (34) is insertedly connected with a fixing bolt (35) threadedly connected with the guide rod (3).

3. The underreamer bit with a stabilizing device of claim 1, wherein: The rear end of the reamer body (1) is fixed with a transmission rod (4), and the outer surface of the transmission rod (4) is sleeved with a fixed bearing (5).

4. A reamer head with a centralizer according to claim 3, characterized in that: The inner wall of the fixed bearing (5) is symmetrically fixed with two limiting blocks (6), the outer surfaces of the two limiting blocks (6) are slidably connected with guide grooves (7) formed on the transmission rod (4), and the outer surface of the fixed bearing (5) is provided with a limiting mechanism for assisting in limiting the drill bit.

5. A reamer head with a centralizer according to claim 4, characterized in that: The limiting mechanism comprises a mounting shell (8) fixed on the outer surface of the fixed bearing (5).

6. A reamer head with a centralizer according to claim 5, characterized in that: The inside of the mounting shell (8) is symmetrically fixed with two fixed blocks (81).

7. A reamer head with a centralizer according to claim 6, characterized in that: The two sides of the two fixed blocks (81) are fixed with drive electric cylinders (82) through screws, and the telescopic ends of the drive electric cylinders (82) are fixed with clamping blocks (83).

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