Rotary joint for coal mine water exploration drill

Abstract

The utility model relates to the technical field of rotary joints, in particular to a rotary joint for a coal mine water exploration drill, which comprises a fixed shell and a hollow middle shaft, a mechanical sealing structure is arranged in front of a bearing to prevent impurities such as sand grains from entering the bearing so as to prevent the bearing from being damaged, and a concentric reducing pipe is arranged at the front end of the fixed shell so as to prevent the bearing from being damaged. The plastic ring and the rubber ring are used for blocking a channel between the large-head pipe and the hollow center shaft to serve as a first seal to isolate impurities such as sand grains and prevent the impurities from entering the mechanical seal structure, cooling water enters from the small-head pipe, a large amount of cooling water enters from the hollow center shaft, and a small amount of cooling water enters from the channel between the large-head pipe and the hollow center shaft. And therefore, the graphite ring and the ceramic ring of the mechanical sealing structure are prevented from being abraded mutually, the mechanical sealing structure and the bearing can be cooled, the service life of the rotary joint is prolonged, and the rotary joint is more suitable for being used in a coal mine.

Description

Technical Field

[0001] This utility model relates to the technical field of rotary joints, and in particular to a rotary joint for water exploration drilling in coal mines. Background Technology

[0002] The rotary joint of a drilling rig is a key component used for conveying media. In a drilling rig, it not only ensures normal operation and high efficiency but also improves its service life and safety. Its applications are widespread, especially in drilling. For example, in coal mining, drill bits generate high temperatures, requiring water cooling of the drill rod core. However, commercially available rotary joints are not suitable for coal mines. Most rotary joints on the market use mechanical seals, but due to the environmental limitations of coal mines, the cooling water used is groundwater, which contains a large amount of sand and other impurities. These impurities enter the rotary joint along with the water flow, damaging the mechanical seal structure or bearing connections. Continued use will damage the rotary joint and even the drill rod. Therefore, current rotary joints have a short service life and require frequent replacement, making this type of rotary joint structure unsuitable for coal mine use. Utility Model Content

[0003] The present invention provides a rotary joint for water exploration drilling in coal mines, so as to prevent impurities from entering the internal structure of the rotary joint.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a rotary joint for a coal mine water exploration drill, comprising a fixed housing and a hollow spindle. The hollow spindle is rotatably mounted inside the fixed housing via bearings, with both ends protruding from the fixed housing. A mechanical seal structure is provided inside the fixed housing, positioned in front of the bearings in the direction of water inlet. A concentric reducer is provided at the front end of the fixed housing, with a small end tube corresponding to the hollow spindle at one end and a large end tube at the other end. The large end tube is fitted onto the front end of the hollow spindle. Plastic rings and rubber rings are arranged between the large end tube and the hollow spindle, with the inner sides of the plastic rings and rubber rings abutting against the hollow spindle and the outer sides abutting against the inner side of the large end tube.

[0005] Furthermore, the mechanical seal structure includes a graphite ring and a ceramic ring that abut against each other. The graphite ring is sealed and installed on the outside of the hollow spindle via a mounting base, and the other side of the ceramic ring abuts against the fixed housing. There is a gap between the graphite ring / ceramic ring and the hollow spindle.

[0006] Furthermore, a fixing ring is provided on the outer side of the hollow central shaft, and the fixing ring is provided with a spring that abuts against the mounting base; a retaining edge is provided on the inner side of the fixed housing, and the ceramic ring seals against the retaining edge, with a gap between the retaining edge and the hollow central shaft.

[0007] Furthermore, a retaining ring for positioning the plastic ring and the rubber ring is provided on the inner side of the large-end tube.

[0008] Furthermore, the fixed housing is fixedly connected to the concentric reducer via a flange, and the inner diameter of the smaller end tube corresponds to the inner diameter of the hollow central shaft, and is concentrically arranged with the hollow central shaft.

[0009] Furthermore, the hollow central shaft is integrally machined.

[0010] Compared with the prior art, the beneficial effects of this utility model are as follows: A concentric reducer is installed at the front end of the fixed housing. The plastic and rubber rings inside the larger end pipe block the channel between the larger end pipe and the hollow central shaft, serving as the first seal to isolate sand and other impurities, preventing them from entering the mechanical seal structure and thus preventing excessive impurities from causing wear on the mechanical seal structure. A mechanical seal structure is installed in front of the bearing as the second seal to isolate sand, further preventing impurities from damaging the bearing. Cooling water enters through the smaller end pipe, with a large amount entering through the hollow central shaft and a small amount entering through the channel between the larger end pipe and the hollow central shaft, flowing through the space between the fixed housing and the hollow central shaft. This prevents mutual wear between the graphite ring and ceramic ring of the mechanical seal structure and also cools the mechanical seal structure and bearing, thereby improving the service life of the rotary joint and making it more suitable for use in coal mines. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0012] Figure 2 This is an exploded view of the present invention.

[0013] Figure 3 This is a cross-sectional view of the present invention.

[0014] Figure 4 for Figure 3 Enlarged view of point A.

[0015] Figure 5 This is a schematic diagram of the concentric reducer in this utility model.

[0016] In the diagram: 1. Fixed housing; 2. Hollow central shaft; 3. Concentric reducer; 4. Bearing; 5. Graphite ring; 6. Ceramic ring; 7. Plastic ring; 8. Rubber ring; 31. Small end tube; 32. Large end tube; 51. Mounting base; 52. Spring; 78. Snap ring; 521. Retaining ring; 621. Edge retainer. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] As shown in the attached figure, this utility model discloses a rotary joint for a coal mine water exploration drill, comprising a fixed housing 1 and a hollow central shaft 2. The hollow central shaft 2 is rotatably mounted inside the fixed housing 1 via bearings 4, with both ends protruding from the fixed housing 1. A mechanical seal structure is provided inside the fixed housing 1, positioned in front of the bearings 4 in the direction of water inlet. A concentric reducer 3 is provided at the front end of the fixed housing 1, with a small end tube 31 corresponding to the hollow central shaft 2 at one end and a large end tube 32 at the other end. The large end tube 32 is fitted with... At the front end of the hollow spindle 2, a plastic ring 7 and a rubber ring 8 are arranged between the large end tube 32 and the hollow spindle 2. The inner sides of the plastic ring 7 and the rubber ring 8 abut against the hollow spindle 2, and the outer sides abut against the inner side of the large end tube 32. To elaborate, the hollow spindle 2 is the rotating end, and the fixed housing 1 is the fixed end. The fixed housing 1 is fixedly connected to the user equipment through the concentric reducer 3 at the front end. That is, when in use, the fixed housing 1 is stationary, and the hollow spindle 2 rotates relative to the drill rod. In addition, the rotary joint is preferably made of stainless steel to effectively prevent corrosion and rust.

[0019] This utility model discloses a rotary joint for water exploration drilling in coal mines. A concentric reducer 3 is installed at the front end of the fixed housing 1. A plastic ring 7 and a rubber ring 8 inside the large-end pipe 32 block the channel between the large-end pipe 32 and the hollow central shaft 2, serving as the first seal to isolate sand and other impurities, preventing them from entering the mechanical seal structure and thus preventing excessive wear on the mechanical seal structure. A mechanical seal structure is installed in front of the bearing 4 as the second seal to isolate sand and prevent damage to the bearing 4 from impurities. Cooling water enters through the small-end pipe 31, with a large amount entering through the hollow central shaft 2 and a small amount entering through the channel between the large-end pipe 32 and the hollow central shaft 2, flowing through the space between the fixed housing 1 and the hollow central shaft 2. This prevents mutual wear between the graphite ring 5 and the ceramic ring 6 of the mechanical seal structure and also cools the mechanical seal structure and the bearing 4, thereby improving the service life of the rotary joint and making it more suitable for use in coal mines.

[0020] Specifically, the mechanical seal structure includes a graphite ring 5 and a ceramic ring 6 that abut against each other. The graphite ring 5 is sealed and installed on the outside of the hollow spindle 2 via a mounting base 51. The other side of the ceramic ring 6 abuts against the fixed housing 1. There is a gap between the graphite ring 5 / ceramic ring 6 and the hollow spindle 2. The mounting base 51 is structured as follows: Figure 3 and 4 As shown, it can be molded from plastic material. The mounting base 51 is fixed on the outside of the hollow central shaft 2 and has a groove on one side. The graphite ring 5 is placed in the groove. The gap between the graphite ring 5 / ceramic ring 6 and the hollow central shaft 2 is mainly to prevent the graphite ring 5 / ceramic ring 6 from directly contacting the hollow central shaft 2. It can also guide the water flow so that the water can flow through the gap and enter the rear end.

[0021] Specifically, a fixing ring 521 is provided on the outer side of the hollow central shaft 2, and a spring 52 is provided on the fixing ring 521 to abut against the mounting base 51; a retaining edge 621 is provided on the inner side of the fixed housing 1, and the ceramic ring 6 is sealed against the retaining edge 621. It should be noted that a pad is provided between the ceramic ring 6 and the retaining edge 621 to prevent direct contact between the ceramic ring 6 and the metal. There is a gap between the retaining edge 621 and the hollow central shaft 2. One end of the spring 52 abuts against the fixing ring 521, and the other end abuts against the mounting base 51, thereby pushing the graphite ring 5 on the mounting base 51 toward the ceramic ring 6, so that the graphite ring 5 abuts against the ceramic ring 6. The other side of the ceramic ring 6 is abutted by the retaining edge 621. That is, the retaining edge 621 and the graphite ring 5 are used to clamp and fix the ceramic ring 6.

[0022] Specifically, the inner side of the large-end tube 32 is provided with a retaining spring 78 for positioning the plastic ring 7 and the rubber ring 8. The inner side of the large-end tube 32 is provided with a groove, and the retaining spring 78 is set in the groove. The retaining spring 78 is used to fix the plastic ring 7 and the rubber ring 8 in the large-end tube 32 to prevent the plastic ring 7 and the rubber ring 8 from coming out of the large-end tube 32. It should be noted that since the concentric reducer 3 is fixedly installed at one end of the fixed housing 1, and the hollow central shaft 2 rotates on the concentric reducer 3, there is a space between the small-end tube 31 and the hollow central shaft 2, and they do not directly contact each other.

[0023] Specifically, the fixed housing 1 is fixedly connected to the concentric reducer 3 via a flange. The inner diameter of the smaller end tube 31 corresponds to the inner diameter of the hollow central shaft 2. Preferably, the inner diameter of the smaller end tube 31 is equal to the inner diameter of the hollow central shaft 2, and they are concentrically arranged. A flange is provided on the side of the concentric reducer 3 and the fixed housing 1 that face each other.

[0024] Specifically, the hollow spindle 2 is integrally machined. It should be noted that the hollow spindle 2, including the positions for installing the bearing 4 and the mechanical seal structure, is machined in one piece on a lathe to ensure the concentricity of the hollow spindle 2.

[0025] The above embodiments are preferred embodiments of this utility model. All structures similar to this utility model and equivalent changes thereof should fall within the protection scope of this utility model.

Claims

1. A rotary joint for a water detection drill in a coal mine, characterized by: The utility model provides a water pump, including fixed casing and hollow middle shaft, the hollow middle shaft is rotationally arranged in fixed casing inside through bearing, and both ends all protrude in fixed casing, mechanical seal structure is arranged in fixed casing inside, mechanical seal structure is arranged in the front of bearing according to water inlet direction, the front end of fixed casing is provided with concentric reducer, one end of concentric reducer is provided with small head pipe corresponding to hollow middle shaft, the other end is provided with big head pipe, big head pipe is sleeved in the front end of hollow middle shaft, and plastic ring and rubber ring are arranged between big head pipe and hollow middle shaft, and the inner side of plastic ring and rubber ring abuts against hollow middle shaft, and the outside all abuts against the inner side of big head pipe.

2. The rotary joint for a water detecting drill for coal mines according to claim 1, characterized in that: The mechanical seal structure includes a graphite ring and a ceramic ring that abut each other, the graphite ring is sealed and installed on the outside of the hollow middle shaft through a mounting seat, the other side of the ceramic ring is sealed and abuts against the fixed casing, and a gap is formed between the graphite ring / ceramic ring and the hollow middle shaft.

3. The rotary joint for a water detecting drill for coal mines according to claim 2, characterized in that: The outside of the hollow middle shaft is provided with a fixing ring, the fixing ring is provided with a spring that abuts against the mounting seat, the inside of the fixed casing is provided with a stop edge, the ceramic ring is sealed and abuts against the stop edge, and a gap is formed between the stop edge and the hollow middle shaft.

4. The rotary joint for a water detecting drill for coal mines according to claim 1, characterized in that: The inside of the big head pipe is provided with a clamping spring for positioning the plastic ring and the rubber ring.

5. The rotary joint for a water detecting drill for coal mines according to claim 1, characterized in that: The fixed casing is fixedly connected to the concentric reducer through a flange, the inner diameter of the small head pipe corresponds to the inner diameter of the hollow middle shaft and is concentrically arranged with the hollow middle shaft.

6. The swivel joint for a water detecting drill for coal mine according to claim 1, characterized in that: The hollow middle shaft is integrally processed and formed.

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