Split structure drilling rig faucet

Abstract

The present invention belongs to the technical field of engineering machinery, and relates to a split-structured drilling rig faucet, including a front mandrel, one axial end of the front mandrel is threadedly connected to a sealing mandrel, the root of the front mandrel is sealed with the sealing mandrel by a seal, and the sealing mandrel and the front mandrel are locked and anti-rotated in a circumferential direction by a locking screw; the front outer sleeve is supported on the front mandrel by two angular contact ball bearings, one axial end of the two angular contact ball bearings is positioned by a shoulder formed on the front mandrel, and the other axial end is positioned by an axial end face of the sealing mandrel, and the sealing mandrel is also sleeved with a connected rear outer sleeve. The product structure of the present invention is reasonable and ingenious, and multiple groups of sealing elements are used for combined sealing, which improves the sealing performance of the drilling rig faucet, and the structural design of the split connection between the mandrel and the outer sleeve of the drilling rig faucet makes the maintenance of the faucet more convenient and quick, and also greatly reduces the maintenance cost.

Description

Technical Field

[0001] The invention belongs to the technical field of engineering machinery and relates to a drilling rig faucet with a split structure. Background Art

[0002] The mud delivery system is an important part of the trenchless horizontal directional drilling pipe laying rig, including mud pumps, mud delivery pipelines, drilling rig faucets, power head rotary spindles, drill rods and drill bits, which are mainly responsible for delivering mud, flushing the bottom of the hole and cooling the drill bit. Among them, the drilling rig faucet is a transition connection device between the mud delivery pipeline and the power head rotary spindle to prevent the mud delivery pipeline from twisting and deforming with the synchronous rotation of the power head rotary spindle during the drilling process. The mud pressure entering the drilling rig faucet is very high, which can reach more than ten MPa. In order to prevent mud leakage, the drilling rig faucet must have good sealing performance.

[0003] At present, the internal parts of drilling rig faucets are mostly sealed with V-shaped sealing rings or packings, and their performance directly affects the service life of the faucet and the drilling efficiency of the whole machine. However, during the drilling process, the existing drilling rig faucets generally have the problem of continuous wear of the sealing rings and the faucet mandrel, causing mud leakage and affecting the drilling efficiency. The internal parts need to be frequently disassembled and replaced, which increases the maintenance cost accordingly. Summary of the invention

[0004] In view of the above problems, the present invention provides a drilling rig faucet with a split structure, which can ensure reliable sealing performance and is easy to repair and maintain.

[0005] According to the technical solution of the present invention: a split-structure drilling rig faucet, characterized in that: it includes a front mandrel, one axial end of the front mandrel is threadedly connected to a sealing mandrel, the root of the front mandrel and the sealing mandrel are sealed by a sealing member, and the sealing mandrel and the front mandrel are locked and anti-rotated in a circumferential direction by a locking screw;

[0006] The front outer sleeve is supported on the front core shaft by two angular contact ball bearings, one axial end of the two angular contact ball bearings is positioned by a shoulder formed on the front core shaft, and the other axial end is positioned by the axial end face of the sealing core shaft. The sealing core shaft is also sleeved with a connected rear outer sleeve, the rear outer sleeve is tightly connected to one axial end of the front outer sleeve, a dust ring is arranged between the other axial end of the front outer sleeve and the front core shaft, and the rear outer sleeve and the sealing core shaft are sealed by a sealing ring and a sealing assembly, wherein one axial end of the sealing assembly is axially positioned by a V-shaped sealing support ring, and the other axial end of the sealing assembly is axially positioned by a retaining ring, and a sealing lubricating oil nipple is arranged on the rear outer sleeve corresponding to the sealing assembly.

[0007] As a further improvement of the present invention, the axial end face of the front core shaft abuts against the step surface of the inner hole of the sealing core shaft, and a hole retaining ring is provided in the annular groove provided on the circumferential surface of the front core shaft, and the hole retaining ring realizes sealing with the sealing core shaft.

[0008] As a further improvement of the present invention, the sealing assembly includes a pressure ring, a V-shaped sealing ring, a middle spacer ring and a V-shaped sealing support ring. The pressure ring is axially positioned by an elastic retaining ring through a hole set in the inner hole of the rear outer sleeve. A V-shaped groove is provided on the right side of the pressure ring. The V-shaped groove is used to install the V-shaped sealing ring, the middle spacer ring, the V-shaped sealing ring and the V-shaped sealing support ring in sequence from left to right. The right end face of the V-shaped sealing support ring is pressed against the entire V-shaped sealing assembly through the end face of the step of the inner hole of the rear outer sleeve.

[0009] As a further improvement of the present invention, the front outer sleeve and the rear outer sleeve are fastened together by screws.

[0010] As a further improvement of the present invention, a bearing lubricating oil nozzle is arranged on the front outer sleeve, and the bearing lubricating oil nozzle is connected to the cavity of the angular contact ball bearing.

[0011] As a further improvement of the present invention, the sealing ring is arranged in a positioning groove arranged on the inner wall of the rear outer sleeve.

[0012] As a further improvement of the present invention, a left-hand sealing pipe thread is provided on the circumferential surface of the other axial end of the front core shaft.

[0013] As a further improvement of the present invention, a ceramic powder coating is sprayed on the surface of the sealing mandrel.

[0014] As a further improvement of the present invention, the inner hole at the right end of the rear outer sleeve is provided with an internal thread.

[0015] The technical effect of the present invention is that the product structure of the present invention is reasonable and ingenious, and multiple groups of sealing elements are used for combined sealing, which improves the sealing performance of the drilling rig faucet. The structural design of the drilling rig faucet core shaft and the outer sleeve are separately connected, which makes the faucet maintenance more convenient and quick, and also greatly reduces the maintenance cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the present invention. DETAILED DESCRIPTION

[0017] The specific implementation of the present invention will be further described below in conjunction with the accompanying drawings.

[0018] Figure 1It includes a front core shaft 1, a front outer sleeve 2, a sealing core shaft 3, a rear outer sleeve 4, a pressure ring 5, an intermediate ring 6, a dust ring 7, a bearing lubricating grease nozzle 8, an angular contact ball bearing 9, a locking screw 10, a sealing ring 11, a screw 12, a retaining ring for the hole 13, a retaining ring 14, a sealing lubricating grease nozzle 15, a V-shaped sealing ring 16, a V-shaped sealing support ring 17, etc.

[0019] like Figure 1 As shown, the present invention is a drilling rig faucet with a split structure, including a front spindle 1, one axial end of the front spindle 1 is threadedly connected to a sealing spindle 3, the root of the front spindle 1 and the sealing spindle 3 are sealed by a seal, and the sealing spindle 3 and the front spindle 1 are locked and anti-rotated in a circumferential direction by a locking screw 10 to prevent the thread from loosening when the front spindle 3 rotates; in specific production, the front spindle 1 and the sealing spindle 3 are connected by a left-handed thread, and the locking screw 10 can prevent the thread from loosening when the front spindle 1 rotates clockwise.

[0020] The front sleeve 2 is supported on the front spindle 1 by two angular contact ball bearings 9, and one axial end of the two angular contact ball bearings 9 is positioned by a shoulder formed on the front spindle 1. The two angular contact ball bearings 9 are installed back to back on the front spindle 1, and the other axial end is positioned by the axial end face of the sealing spindle 3. The sealing spindle 3 is also sleeved with a connected rear sleeve 4, and the rear sleeve 4 is tightly connected to one axial end of the front sleeve 2. A dust ring 7 is arranged between the other axial end of the front sleeve 2 and the front spindle 1, and the rear sleeve 4 and the sealing spindle 3 are sealed by a sealing ring 11 and a sealing assembly, wherein one axial end of the sealing assembly is axially positioned by a V-shaped sealing support ring 17, and the other axial end of the sealing assembly is axially positioned by a retaining ring 14, and a sealing lubricating oil nozzle 15 is arranged on the rear sleeve 4 corresponding to the sealing assembly to ensure that the drilling rig faucet has a more reliable sealing performance.

[0021] The axial end face of the front core shaft 1 abuts against the step surface of the inner hole of the sealing core shaft 3 , and a hole retaining ring 13 is arranged in the annular groove arranged on the circumferential surface of the front core shaft 1 , and the hole retaining ring 13 realizes sealing with the sealing core shaft 3 .

[0022] The sealing assembly includes a pressure ring 5, a V-shaped sealing ring 16, an intermediate spacer ring 6, and a V-shaped sealing support ring 17. The pressure ring 5 is axially positioned by an elastic retaining ring 13 through a hole set in the inner hole of the rear outer sleeve 4. A V-shaped groove is set on the right side of the pressure ring 5. The V-shaped groove is sequentially installed with the V-shaped sealing ring 16, the intermediate spacer ring 6, the V-shaped sealing ring 16 and the V-shaped sealing support ring 17 from left to right. The right end face of the V-shaped sealing support ring 17 is pressed against the end face of the step of the inner hole of the rear outer sleeve 4 to tighten the entire V-shaped sealing assembly.

[0023] The front outer sleeve 2 and the rear outer sleeve 4 are fastened together by screws 12. It is understandable that the axial end surface where the rear outer sleeve 4 is connected to the front outer sleeve 2 is also provided with an annular boss, which is pressed against the outer ring of the adjacent angular contact ball bearing 9.

[0024] A bearing lubricating oil nozzle 8 is provided on the front outer sleeve 2, and the bearing lubricating oil nozzle 8 is connected to the cavity of the angular contact ball bearing 9. The sealing ring 11 is provided in a positioning groove provided on the inner wall of the rear outer sleeve 4 to ensure that the sealing ring 11 will not be axially limited.

[0025] A left-handed sealing pipe thread is provided on the circumferential surface of the other axial end of the front core shaft 1. In specific production, a 55° left-handed sealing pipe thread is provided on the other axial end of the front core shaft 1 to be connected to the rotary main shaft of the power head; an internal thread is provided on the inner hole at the right end of the rear outer sleeve 4 to be connected to the mud conveying pipeline.

[0026] The surface of the sealing core shaft 3 is sprayed with a ceramic powder coating to improve the wear resistance of the sealing core shaft.

[0027] like Figure 1 As shown, the product of the present invention can achieve reliable sealing of the product by setting a hole retaining ring 13 and a sealing assembly. The present invention and its embodiments are described above, and the description is not restrictive. What is shown in the accompanying drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. In short, if ordinary technicians in this field are inspired by it, without departing from the purpose of the invention, they can design structural methods and embodiments similar to the technical solution without creativity, which should all fall within the scope of protection of the present invention.

Claims

1. A split-structure drilling rig faucet, characterized in that: The invention comprises a front core shaft (1), wherein one axial end of the front core shaft (1) is threadedly connected to a sealing core shaft (3), a sealing member is provided between the root of the front core shaft (1) and the sealing core shaft (3), and a locking screw (10) is provided between the sealing core shaft (3) and the front core shaft (1) to achieve circumferential locking and anti-rotation positioning; The front outer sleeve (2) is supported on the front core shaft (1) by two angular contact ball bearings (9), one axial end of the two angular contact ball bearings (9) is positioned by a shaft shoulder formed on the front core shaft (1), and the other axial end is positioned by an axial end face of a sealing core shaft (3), the sealing core shaft (3) is also sleeved with a connected rear outer sleeve (4), the rear outer sleeve (4) is tightly connected to one axial end of the front outer sleeve (2), a dust ring (7) is arranged between the other axial end of the front outer sleeve (2) and the front core shaft (1), and the rear outer sleeve (4) and the sealing core shaft (3) are sealed by a sealing ring (11) and a sealing assembly, wherein one axial end of the sealing assembly is axially positioned by a V-shaped sealing support ring (17), and the other axial end of the sealing assembly is axially positioned by a retaining ring (14), and a sealing lubricating oil nozzle (15) is arranged on the rear outer sleeve (4) at a position corresponding to the sealing assembly; The axial end face of the front core shaft (1) abuts against the step surface of the inner hole of the sealing core shaft (3); a hole retaining ring (13) is provided in the annular groove provided on the circumferential surface of the front core shaft (1); the hole retaining ring (13) realizes sealing with the sealing core shaft (3); The sealing assembly comprises a pressure ring (5), a V-shaped sealing ring (16), an intermediate spacer ring (6) and a V-shaped sealing support ring (17); the pressure ring (5) is axially positioned by an elastic retaining ring (13) through a hole provided in the inner hole of the rear outer sleeve (4); a V-shaped groove is provided on the right side of the pressure ring (5); the V-shaped sealing ring (16), the intermediate spacer ring (6), the V-shaped sealing ring (16) and the V-shaped sealing support ring (17) are installed in sequence in the V-shaped groove from left to right; the right end face of the V-shaped sealing support ring (17) is pressed against the end face of the step in the inner hole of the rear outer sleeve (4) to tighten the entire V-shaped sealing assembly; A bearing lubricating oil nozzle (8) is provided on the front outer sleeve (2), and the bearing lubricating oil nozzle (8) is connected to the cavity of the angular contact ball bearing (9); the sealing ring (11) is arranged in a positioning groove provided on the inner wall of the rear outer sleeve (4).

2. The split-structure drilling rig faucet according to claim 1, characterized in that: The front outer sleeve (2) and the rear outer sleeve (4) are fastened together by means of screws (12).

3. The split-structure drilling rig faucet according to claim 1, characterized in that: A left-hand sealing pipe thread is provided on the circumferential surface of the other axial end of the front core shaft (1).

4. The split-structure drilling rig faucet according to claim 1, characterized in that: The surface of the sealing core shaft (3) is sprayed with a ceramic powder coating.

5. The split-structure drilling rig faucet according to claim 1, characterized in that: The inner hole at the right end of the rear outer sleeve (4) is provided with an internal thread.

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