Double-end slurry feeding reamer mandrel

Abstract

The utility model relates to the technical field of reamer mandrels, in particular to a double-end slurry feeding reamer mandrel which reduces cost, prevents slurry leakage caused by unbalanced pressure of slurry introduced into two ends and improves practicability. Comprising a body mechanism; the device further comprises a leakage-proof mechanism, the leakage-proof mechanism is installed in the main body mechanism, chambering treatment can be conducted through the main body mechanism, and the leakage-proof mechanism prevents slurry from flowing out of the rear end of the main body mechanism.

Description

Technical Field

[0001] The utility model relates to the technical field of reamer core shafts, in particular to a double-end slurry feeding reamer core shaft. Background Art

[0002] Hole reaming is a critical and labor-intensive process in horizontal directional drilling. It involves expanding the pilot hole to the required diameter after it is formed. The goal is to create a hole large enough for pipeline entry. The reamer mandrel is the core component of the reamer, carrying its primary functions and characteristics. It has a through-hole in the center and water holes in the sidewalls.

[0003] Existing reamers, such as the prior art with application number CN202022147105.3, include a center shaft, a male joint, a cylinder, a cutting spine and a center hole, which prevent drill chips from being adsorbed on the reamer to form huge resistance, and also realize bidirectional reaming of the reamer.

[0004] However, when using the existing technology, there is a situation where mud needs to be fed from the front and rear ends of the core shaft at the same time. At this time, a one-way valve joint needs to be added to the front and rear ends of the core shaft to prevent mud leakage caused by unbalanced pressure of the mud entering from both ends. The use of a one-way valve joint is costly, and the valve core of the one-way valve is easily eroded by the mud. Utility Model Content

[0005] In order to solve the above technical problems, the utility model provides a double-end slurry feeding reamer core shaft which reduces costs, prevents mud leakage caused by unbalanced mud pressure at both ends, and improves practicality.

[0006] The utility model discloses a double-end slurry feeding reamer core shaft, comprising a main body mechanism; and also comprising an anti-leakage mechanism, which is installed inside the main body mechanism, through which reaming processing can be performed, and the anti-leakage mechanism prevents mud from flowing out from the rear end of the main body mechanism; the main body mechanism can be used to perform reaming processing, and the anti-leakage mechanism prevents mud from flowing out from the rear end of the main body mechanism, thereby preventing mud leakage caused by unbalanced pressure of mud introduced at both ends and reducing costs.

[0007] Preferably, the main structure includes a reamer body, a core shaft and two rows of water holes. The core shaft is installed on the reamer body and is provided with two rows of water holes. The slurry is fed through both ends of the core shaft and then discharged through the two rows of water holes.

[0008] Preferably, the anti-leakage mechanism includes two elastic retaining rings for holes, two retaining sleeves, two O-rings, and a steel ball. The two elastic retaining rings for holes are installed at both ends of the core shaft, the two retaining sleeves are also installed at both ends of the core shaft, the two O-rings are installed on the two retaining sleeves, and the steel ball is placed inside the core shaft, and the steel ball is located between the two retaining sleeves; when mud passes through both ends of the core shaft at the same time and the mud pressure at both ends is equal, the steel ball will move to the middle of the two rows of water holes. When the mud pressure entering the front end is greater than the mud pressure entering the rear end, the steel ball will move to the rear end retaining sleeve to prevent the mud from flowing out from the rear end of the core shaft.

[0009] Preferably, a tapered opening is provided on the side of the retaining sleeve facing the steel ball; when mud passes through both ends of the core shaft at the same time and the mud pressure at both ends is equal, the steel ball will move to the middle of the two rows of water holes. When the mud pressure entering the front end is greater than the mud pressure entering the rear end, the steel ball will move to the rear end retaining sleeve and block the tapered opening of the rear end retaining sleeve to prevent the mud from flowing out from the rear end of the core shaft. The tapered opening can improve the quality of the sealing.

[0010] Preferably, the diameter of the steel ball is larger than the inner diameter of the stop sleeve and smaller than the inner diameter of the core shaft; the above arrangement can better complete the sealing of the stop sleeve by the steel ball.

[0011] Preferably, the outside of the steel ball is coated with rubber; the above arrangement improves the quality of the steel ball sealing the stopper.

[0012] Compared with the prior art, the present invention has the following beneficial effects: hole enlargement can be performed through the main body mechanism, the anti-leakage mechanism prevents mud from flowing out from the rear end of the main body mechanism, and prevents mud leakage caused by unbalanced pressure of mud introduced at both ends, thereby reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the cross-sectional structure of the utility model;

[0014] Figure 2 It is a schematic cross-sectional structure diagram of the core shaft of the present utility model;

[0015] Figure 3 It is a schematic diagram of the cross-sectional structure of the prior art;

[0016] Markings in the accompanying drawings: 01, main body; 11, reamer body; 12, core shaft; 13, water hole; 02, anti-leakage mechanism; 21, elastic retaining ring for hole; 22, retaining sleeve; 23, O-ring; 24, steel ball; 31, cone mouth. DETAILED DESCRIPTION

[0017] To facilitate understanding of the present invention, a more comprehensive description of the present invention will be provided below with reference to the accompanying drawings. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the present invention.

[0018] Example 1

[0019] like Figures 1 to 2 As shown, a double-ended slurry feeding reamer core shaft includes a main body 01 and an anti-leakage mechanism 02. The anti-leakage mechanism 02 is installed inside the main body 01. The main body 01 can be used to perform reaming processing. The anti-leakage mechanism 02 prevents mud from flowing out of the rear end of the main body 01.

[0020] The main body 01 includes a reamer body 11, a core shaft 12 and two rows of water holes 13. The core shaft 12 is mounted on the reamer body 11 and is provided with two rows of water holes 13.

[0021] The anti-leakage mechanism 02 includes two elastic circlips 21 for holes, two stopper sleeves 22, two O-rings 23, and a steel ball 24. The two elastic circlips 21 for holes are installed at both ends of the core shaft 12, and the two stopper sleeves 22 are also installed at both ends of the core shaft 12. The two O-rings 23 are installed on the two stopper sleeves 22. The steel ball 24 is placed inside the core shaft 12 and is located between the two stopper sleeves 22.

[0022] The side of the stopper sleeve 22 facing the steel ball 24 is provided with a tapered opening 31;

[0023] The diameter of the steel ball 24 is larger than the inner diameter of the stopper sleeve 22 and smaller than the inner diameter of the core shaft 12;

[0024] The outside of the steel ball 24 is covered with rubber;

[0025] Slurry is fed through both ends of the core shaft 12 and then discharged through the two water holes 13. When slurry flows through both ends of the core shaft 12 at the same time and the slurry pressure at both ends is equal, the steel ball 24 will move to the middle of the two rows of water holes. When the slurry pressure at the front end is greater than the slurry pressure at the rear end, the steel ball 24 will move to the rear end stopper sleeve 22 and block the tapered mouth 31 of the rear end stopper sleeve 22 to prevent the slurry from flowing out from the rear end of the core shaft. The tapered mouth 31 can improve the quality of the plugging.

[0026] like Figures 1 to 3As shown, the utility model is a double-end slurry feeding reamer core shaft, which, when working, feeds slurry through the two ends of the core shaft 12, and then discharges it through the two water holes 13. When mud passes through both ends of the core shaft 12 at the same time and the mud pressure at both ends is equal, the steel ball 24 will move to the middle of the two rows of water holes. When the mud pressure entering the front end is greater than the mud pressure entering the rear end, the steel ball 24 will move to the rear end stop sleeve 22 and block the tapered mouth 31 of the rear end stop sleeve 22 to prevent the mud from flowing out from the rear end of the core shaft. The tapered mouth 31 can improve the quality of the plugging.

[0027] The main functions achieved by the utility model are: during the operation of the reamer core shaft, the cost is reduced, mud leakage is prevented when the pressure of mud introduced at both ends is unbalanced, and practicability is improved.

[0028] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A double-ended slurry feeding reamer core shaft, comprising a main body mechanism (01); characterized in that: It also includes an anti-leakage mechanism (02), which is installed inside the main body mechanism (01); The main body (01) can be expanded, and the anti-leakage mechanism (02) prevents mud from flowing out of the rear end of the main body (01); The main body mechanism (01) comprises a reamer body (11), a core shaft (12) and two rows of water holes (13); the core shaft (12) is mounted on the reamer body (11), and the core shaft (12) is provided with two rows of water holes (13); The anti-leakage mechanism (02) comprises two elastic circlips (21) for holes, two blocking sleeves (22), two O-rings (23), and a steel ball (24). The two elastic circlips (21) for holes are installed at both ends of the core shaft (12), the two blocking sleeves (22) are also installed at both ends of the core shaft (12), the two O-rings (23) are installed on the two blocking sleeves (22), and the steel ball (24) is placed inside the core shaft (12) and between the two blocking sleeves (22).

2. A double-ended slurry feeding reamer mandrel according to claim 1, characterized in that: A tapered opening (31) is provided on one side of the stop sleeve (22) facing the steel ball (24).

3. A double-ended slurry feeding reamer mandrel according to claim 1, characterized in that: The diameter of the steel ball (24) is larger than the inner hole diameter of the stop sleeve (22) and smaller than the inner hole diameter of the core shaft (12).

4. A double-ended reamer mandrel as claimed in claim 1, characterized in that: The outside of the steel ball (24) is covered with rubber.

Images