A swivel joint for a horizontal directional drilling machine

Abstract

The utility model discloses a rotary joint for horizontal directional drilling machine, including the main shaft, the one side of main shaft is provided with the rotating shaft, the inside of main shaft is provided with the through -hole no.

Description

Technical Field

[0001] This utility model relates to the field of rotary joint technology, specifically a rotary joint for horizontal directional drilling rigs. Background Technology

[0002] Horizontal directional drilling rigs are construction equipment used for trenchless laying of underground pipelines, playing a crucial role in urban construction, energy transmission, and communication network construction. During the construction process of horizontal directional drilling rigs, the rotary joint is an indispensable key component. When the horizontal directional drilling rig is working, the drill rod needs to rotate continuously to achieve drilling and pullback operations, while also supplying media such as mud to the drill bit for cooling and carrying drill cuttings. The rotary joint undertakes the important task of connecting the rotating and stationary components and ensuring the stable delivery of media such as mud during rotation.

[0003] For example, the patent with announcement number CN202659168U (a rotary joint for a horizontal directional drilling rig) includes: a main shaft, which is mounted in a housing via bearings; an end cover is provided at the rear end of the housing; a rotary joint and a sealing joint are provided inside the end cover; a spring is provided between the sealing joint and the rotary joint; a pair of cooperating hard alloy plates are provided between the sealing joint and the main shaft; one hard alloy plate is fixed on the front end of the sealing joint; the other hard alloy plate is fixed on the rear end of the main shaft; the sealing joint is mounted on the housing via a cylindrical pin; a channel one is provided inside the rotary joint; a channel two is provided inside the sealing joint; and a channel three is provided inside the main shaft; channels one, two, and three are interconnected.

[0004] Although the existing technology mentioned above uses a hard alloy sealing structure and the spring automatically compensates for the wear of the two hard alloy plates, resulting in a long service life and less grout leakage, it does not have a shielding structure at the joint. Consequently, when the internal fluid pressure is high during the use of the rotary joint, leakage is prone to occur at the joint, which not only affects the normal operation of the equipment but may also pose safety hazards. Therefore, there is an urgent need in the market to develop a rotary joint for horizontal directional drilling rigs to help people solve the existing problems. Utility Model Content

[0005] The purpose of this utility model is to provide a rotary joint for horizontal directional drilling rigs to solve the problem mentioned in the background art that when the internal fluid pressure is high during the use of the rotary joint, leakage is likely to occur at the joint, which not only affects the normal operation of the equipment, but may also bring safety hazards.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a rotary joint for a horizontal directional drilling rig, comprising a main shaft, a rotating shaft disposed on one side of the main shaft, a first flow hole disposed inside the main shaft, a second flow hole disposed inside the rotating shaft, a baffle disposed between the main shaft and the rotating shaft, one end of the baffle being inserted into the first flow hole of the main shaft, the other end of the baffle being inserted into the second flow hole of the rotating shaft, the outer end face of the baffle being in contact with the inner end faces of the main shaft and the rotating shaft respectively, and a cavity disposed inside the baffle, wherein the diameters at both ends of the cavity are larger than the middle diameter of the cavity.

[0007] Preferably, the outer ends of the baffle are symmetrically provided with outer annular grooves, and a sealing ring is fixedly installed inside the outer annular groove of the baffle.

[0008] Preferably, a housing is provided at one end of the outer side of the main shaft, and a cover is fixedly installed on one side of the housing, the cover being fixedly installed on the outer side of the rotating shaft.

[0009] Preferably, a bearing is fixedly mounted on the outer side of the spindle, and the outer ring of the bearing is fixedly connected to the housing.

[0010] Preferably, an oil seal one is provided between the spindle and the housing along one side of the bearing, and an oil seal two is provided between the spindle and the housing along the other side of the bearing. A dustproof ring is fixedly installed on one side of the housing, and the dustproof ring is in close contact with the spindle.

[0011] Preferably, a connecting ring is fixedly installed on the outer side of the baffle, and an outer ring body is fixedly installed on the outer side of the connecting ring, with the inner end face of the outer ring body in close contact with the outer end faces of the main shaft and the rotating shaft.

[0012] Preferably, a fixing plate is fixedly installed on the outer side of the outer ring body, and the fixing plate is fixedly connected to the shell.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] 1. This utility model constructs a shielding barrier at the joint by inserting a flow hole one of the main shaft into one end of the baffle and a flow hole two of the rotating shaft into the other end, with its outer end face in close contact with the inner end face of the main shaft and the rotating shaft respectively. This barrier can withstand greater fluid pressure, effectively prevent fluid from overflowing from the joint, ensure the stability and continuity of fluid transport inside the rotary joint, and thus ensure the normal operation of the horizontal directional drilling rig, increasing its practicality.

[0015] 2. This utility model features symmetrical outer annular grooves at both ends of the outer side of the baffle, with sealing rings fixedly installed inside the outer annular grooves. The sealing rings enhance the sealing between the baffle and the main shaft and rotating shaft, providing a good compensating sealing effect and effectively preventing fluid leakage.

[0016] 3. This utility model effectively prevents external dust and impurities from entering the bearing area by providing oil seal one and oil seal two on both sides of the bearing between the spindle and the housing, and also prevents the leakage of lubricating oil inside the bearing, ensuring that the bearing is always in a good lubrication state, thus increasing its practicality. Attached Figure Description

[0017] Figure 1 This is a front view of a rotary joint for a horizontal directional drilling rig according to the present invention;

[0018] Figure 2 This is a cross-sectional view of a rotary joint for a horizontal directional drilling rig according to the present invention;

[0019] Figure 3 This is an enlarged schematic diagram of part A of this utility model.

[0020] In the diagram: 1. Main shaft; 2. Housing; 3. Rotating shaft; 4. Cover; 5. Baffle; 501. Cylinder; 502. Outer ring groove; 6. Connecting ring; 7. Outer ring body; 8. Fixing plate; 9. Sealing ring; 10. Bearing; 11. Oil seal one; 12. Oil seal two; 13. Dustproof ring. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0022] Please see Figure 1-3 The present invention provides an embodiment of a rotary joint for a horizontal directional drilling rig, comprising a main shaft 1, a rotating shaft 3 disposed on one side of the main shaft 1, a flow hole 1 disposed inside the main shaft 1, a flow hole 2 disposed inside the rotating shaft 3, a baffle 5 disposed between the main shaft 1 and the rotating shaft 3, one end of the baffle 5 being inserted into the flow hole 1 of the main shaft 1, the other end of the baffle 5 being inserted into the flow hole 2 of the rotating shaft 3, the outer end face of the baffle 5 being in contact with the inner end faces of the main shaft 1 and the rotating shaft 3 respectively, and a cavity 501 disposed inside the baffle 5, the diameters at both ends of the cavity 501 being larger than the middle diameter of the cavity 501.

[0023] When the rotary joint is working, the baffle 5, with its tight fit design, can withstand large fluid pressure, effectively preventing fluid from overflowing from the joint, avoiding equipment failure caused by leakage, ensuring the stability and continuity of fluid transportation inside the rotary joint, thereby ensuring the normal operation of the horizontal directional drilling rig, and also preventing potential safety hazards caused by fluid leakage, thus improving the safety and reliability of use.

[0024] Furthermore, outer annular grooves 502 are symmetrically provided at both ends of the outer side of the baffle 5, and sealing rings 9 are fixedly installed inside the outer annular grooves 502 of the baffle 5.

[0025] The sealing ring 9 enhances the sealing performance between the baffle 5 and the main shaft 1 and the rotating shaft 3, providing a good compensating sealing effect, effectively preventing fluid leakage, and increasing practicality.

[0026] Furthermore, a housing 2 is provided at one end of the outer side of the main shaft 1, and a cover 4 is fixedly installed on one side of the housing 2. The cover 4 is fixedly installed on the outer side of the rotating shaft 3. A bearing 10 is fixedly installed on the outer side of the main shaft 1, and the outer ring of the bearing 10 is fixedly connected to the housing 2. An oil seal 11 is provided between the main shaft 1 and the housing 2 along one side of the bearing 10, and an oil seal 22 is provided between the main shaft 1 and the housing 2 along the other side of the bearing 10.

[0027] Oil seal 11 and oil seal 22 can effectively prevent external dust and impurities from entering the bearing 10 area, avoiding damage to the bearing 10. At the same time, they can also prevent the lubricating oil inside the bearing 10 from leaking, ensuring that the bearing 10 is always in a good lubrication state and extending the service life of the bearing 10.

[0028] Furthermore, a dustproof ring 13 is fixedly installed on one side of the housing 2, and the dustproof ring 13 is in close contact with the main shaft 1.

[0029] The dust ring 13 can prevent external dust, sand and other impurities from entering the rotary joint, avoiding these impurities from causing wear and damage to components such as the spindle 1 and bearing 10, ensuring the normal operation of the rotary joint, and improving the reliability and stability of the rotary joint.

[0030] Furthermore, a connecting ring 6 is fixedly installed on the outer side of the baffle 5, and an outer ring body 7 is fixedly installed on the outer side of the connecting ring 6. The inner end face of the outer ring body 7 is in contact with the outer end faces of the main shaft 1 and the rotating shaft 3.

[0031] The connection ring 6 and outer ring 7 enhance the connection strength between the baffle 5 and the main shaft 1 and the rotating shaft 3, making the whole structure more stable and reducing the loosening or deformation of parts caused by uneven force or vibration during operation. In addition, the outer ring 7 is in close contact with the outer end face of the main shaft 1 and the rotating shaft 3, which further enhances the sealing performance of the rotary joint and improves the sealing reliability of the rotary joint.

[0032] Furthermore, a fixing plate 8 is fixedly installed on the outer side of the outer ring 7, and the fixing plate 8 is fixedly connected to the shell 2.

[0033] The fixing plate 8 firmly connects the outer ring 7 to the housing 2, making the entire rotary joint structure more stable and increasing its practicality.

[0034] Working principle: During use, fluid is transmitted through the flow hole one of the main shaft 1 and the flow hole two of the rotating shaft 3. The two ends of the baffle 5 are inserted into the flow holes of the main shaft and the rotating shaft respectively, and its outer end face is tightly fitted with both to form the main sealing surface to prevent high-pressure fluid leakage. The diameter of the two ends of the cylinder cavity 501 is larger and the diameter in the middle is smaller, which optimizes the flow channel structure. The sealing rings 9 are installed in the outer ring grooves 502 at both ends of the baffle 5 to further compensate for the sealing gap and prevent fluid leakage. At the same time, oil seal one 11 and oil seal two 12 protect the bearing 10 to prevent external contaminants from entering and internal lubricating oil from leaking, ensuring stable operation of the bearing. The dust ring 13 is tightly fitted with the main shaft 1 to block external dust, mud and other impurities from entering the rotary joint, protecting the bearing and seals, ensuring reliable operation of the rotary joint and increasing its practicality.

[0035] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A rotary joint for a horizontal directional drilling rig, comprising a spindle (1), characterized in that: A rotating shaft (3) is provided on one side of the main shaft (1). A flow hole one is provided inside the main shaft (1). A flow hole two is provided inside the rotating shaft (3). A baffle (5) is provided between the main shaft (1) and the rotating shaft (3). One end of the baffle (5) is inserted into the flow hole one of the main shaft (1). The other end of the baffle (5) is inserted into the flow hole two of the rotating shaft (3). The outer end face of the baffle (5) is in contact with the inner end face of the main shaft (1) and the rotating shaft (3) respectively. A cavity (501) is provided inside the baffle (5). The diameters at both ends of the cavity (501) are larger than the middle diameter of the cavity (501).

2. A rotary joint for a horizontal directional drilling rig according to claim 1, characterized in that: The outer ends of the baffle (5) are symmetrically provided with outer ring grooves (502), and a sealing ring (9) is fixedly installed inside the outer ring groove (502) of the baffle (5).

3. A rotary joint for a horizontal directional drilling rig according to claim 1, characterized in that: A housing (2) is provided at one end of the outer side of the main shaft (1), and a cover (4) is fixedly installed on one side of the housing (2). The cover (4) is fixedly installed on the outer side of the rotating shaft (3).

4. A rotary joint for a horizontal directional drilling rig according to claim 2, characterized in that: A bearing (10) is fixedly installed on the outer side of the main shaft (1), and the outer ring of the bearing (10) is fixedly connected to the housing (2).

5. A rotary joint for a horizontal directional drilling rig according to claim 3, characterized in that: An oil seal (11) is provided between the main shaft (1) and the housing (2) along one side of the bearing (10), and an oil seal (12) is provided between the main shaft (1) and the housing (2) along the other side of the bearing (10). A dustproof ring (13) is fixedly installed on one side of the housing (2), and the dustproof ring (13) is in close contact with the main shaft (1).

6. A rotary joint for a horizontal directional drilling rig according to claim 2, characterized in that: A connecting ring (6) is fixedly installed on the outer side of the baffle (5), and an outer ring body (7) is fixedly installed on the outer side of the connecting ring (6). The inner end face of the outer ring body (7) is in contact with the outer end face of the main shaft (1) and the rotating shaft (3).

7. A rotary joint for a horizontal directional drilling rig according to claim 6, characterized in that: A fixing plate (8) is fixedly installed on the outer side of the outer ring (7), and the fixing plate (8) is fixedly connected to the shell (2).

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