Rotary water seal structure of drill box with replaceable wear-resistant spacer sleeve

Abstract

The utility model discloses a kind of drill box rotary water seal structure with replaceable wear-resistant spacer, it is related to the technical field of mine machinery, including main shaft, main shaft is installed in shell by conical roller bearing, main shaft both ends are connected with hydraulic motor and drill sleeve respectively, drill rod is inserted inside drill sleeve, drill rod sealing ring is installed in drill sleeve inside annular groove, mud shield is installed outside drill sleeve, shaft head sealing O-shaped ring is installed between main shaft one end and drill sleeve, mud shield and hydraulic motor are fixedly connected on shell by inner hexagonal cylindrical head screw respectively, water seal wear-resistant spacer is installed on the outside of main shaft and realizes axial and radial positioning by elastic pin;Water seal wear-resistant spacer surface is sprayed wear-resistant alloy coating;Water seal wear-resistant spacer is sealed by spacer sealing O-shaped ring between main shaft;Water seal O-shaped ring is arranged in annular cavity in shell and forms friction pair with the outer circle of water seal wear-resistant spacer;Using the structure can avoid direct wear of main shaft, improve sealing stability and prolong the service life of main shaft.

Description

Technical Field

[0001] This utility model relates to the field of mining machinery technology, and in particular to a rotary water seal structure for a drill box with a replaceable wear-resistant spacer. Background Technology

[0002] Currently, most anchor bolt and cable drilling rigs used in China employ a wet drill box. During operation, a hollow drill rod is installed at the front end of the drill box, and high-pressure water must pass through the drill box to enter the high-speed rotating drill rod tail end for flushing the borehole, cooling the drill bit, and removing slag. Existing solutions often use a water seal O-ring to directly rub against the outer diameter of the spindle to form a friction pair. This presents the following problems:

[0003] 1) The water seal O-ring slides with the spindle for a long time, which can easily cause groove wear on the outer circle of the spindle and induce corrosion;

[0004] 2) Once the sealing surface is worn or grooved, the sealing performance will rapidly decline, and high-pressure water can enter the bearing cavity along the wear grooves;

[0005] 3) Maintenance often requires replacement or re-grinding of the spindle, which is costly and time-consuming.

[0006] Therefore, there is an urgent need to design a rotary water seal structure for the drill box with a replaceable wear-resistant spacer to solve the problems existing in the above-mentioned technologies. Summary of the Invention

[0007] The purpose of this invention is to provide a rotary water seal structure for a drill box with a replaceable wear-resistant spacer, which features an optimized structure, reduced wear and tear, and easy replacement.

[0008] To achieve the above objectives, this utility model provides the following technical solution:

[0009] A rotary water seal structure for a drill box with a replaceable wear-resistant spacer includes a spindle mounted in a housing via tapered roller bearings. A hydraulic motor and a drill sleeve are connected to both ends of the spindle. A drill rod is inserted into the drill sleeve, and a drill rod sealing ring is installed in the inner annular groove of the drill sleeve. A mudguard is installed on the outside of the drill sleeve. A shaft end seal O-ring is installed between one end of the spindle and the drill sleeve. The mudguard and the hydraulic motor are fixedly connected to the housing via hexagonal head screws. A skeleton oil seal is installed between the spindle, the housing, and the mudguard. The structure also includes:

[0010] A water-sealed wear-resistant spacer is installed on the outside of the main shaft and is positioned axially and radially by a flexible pin.

[0011] The surface of the water-sealed wear-resistant spacer is coated with a wear-resistant alloy coating.

[0012] A spacer O-ring is used to seal the water-sealed wear-resistant spacer to the main shaft.

[0013] A water-sealing O-ring is disposed in the annular cavity inside the housing and forms a friction pair with the outer circle of the water-sealing wear-resistant spacer.

[0014] Furthermore, the tapered roller bearing is installed and fixed by adjusting the preload with a round nut and by using a locking washer and a washer ring.

[0015] In the above technical solution, the rotary water seal structure of the drill box with a replaceable wear-resistant spacer of this utility model has the following beneficial effects:

[0016] In this structure, the water-sealed O-ring and the water-sealed wear-resistant spacer work together to improve sealing performance and stability; the surface of the water-sealed wear-resistant spacer can be coated with alloy to improve smoothness and wear resistance; and it avoids direct wear on the spindle, extending the spindle's life; replacing the water-sealed structure does not require replacing the spindle, making maintenance simpler and more convenient. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0018] Figure 1 This is a schematic diagram of a rotary water seal structure for a drill box with a replaceable wear-resistant spacer, provided as an embodiment of the present invention.

[0019] Explanation of reference numerals in the attached figures:

[0020] 1. Spindle; 2. Hydraulic motor; 3. Tapered roller bearing; 4. Housing; 5. Drill pipe seal; 6. Drill bushing; 7. Mud guard; 8. Shaft head seal O-ring; 9. Skeleton oil seal; 10. Water-sealed wear-resistant spacer; 11. Spacer seal O-ring; 12. Water-sealed O-ring; 13. Round nut; 14. Locking washer; 15. Washer ring. Detailed Implementation

[0021] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0022] It should be noted that the terms "external", "outer side", "both ends", "one end", etc. used in this document indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the purpose of illustrative purposes and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0023] See Figure 1 As shown;

[0024] A rotary water seal structure for a drill box with replaceable wear-resistant spacers includes a spindle 1, which is mounted in a housing 4 via tapered roller bearings 3. A hydraulic motor 2 and a drill sleeve 6 are respectively connected to both ends of the spindle 1. A drill rod is inserted into the drill sleeve 6, and a drill rod sealing ring 5 is installed in the inner annular groove of the drill sleeve 6. A mudguard 7 is installed on the outside of the drill sleeve 6. A shaft end sealing O-ring 8 is installed between one end of the spindle 1 and the drill sleeve 6. The mudguard 7 and the hydraulic motor 2 are respectively fixedly connected to the housing 4 via hexagonal head screws. A skeleton oil seal 9 is installed between the spindle 1, the housing 4, and the mudguard 7. The structure is characterized by further comprising:

[0025] Water-sealed wear-resistant spacer 10 is installed on the outside of the main shaft 1 and is positioned axially and radially by elastic pins.

[0026] The surface of the water-sealed wear-resistant spacer 10 is coated with a wear-resistant alloy coating.

[0027] The spacer O-ring 11 is used to seal the water-sealed wear-resistant spacer 10 with the main shaft 1.

[0028] The water-sealing O-ring 12 is disposed in the annular cavity inside the housing 4 and forms a friction pair with the outer circle of the water-sealing wear-resistant spacer 10.

[0029] The tapered roller bearing 3 is installed and fixed by adjusting the preload with a round nut 13 and by using a retaining washer 14 and a washer 15.

[0030] Specifically, the spindle 1 is mounted inside the housing 4 via two sets of tapered roller bearings 3. A replaceable water-sealed wear-resistant spacer 10 is provided outside the spindle 1. The surface of the water-sealed wear-resistant spacer 10 is coated with a wear-resistant alloy coating. A water-sealed O-ring 12 is installed in the annular cavity inside the housing 4. The water-sealed O-ring 12 and the outer circle of the water-sealed wear-resistant spacer 10 form a friction pair (dynamic seal). A spacer sealing O-ring 11 (static seal) is provided between the water-sealed wear-resistant spacer 10 and the spindle 1 to seal the mating surfaces. While ensuring the reliability of the water seal at the front end of the drill box, direct wear of the water seal on the spindle 1 is avoided, and performance can be quickly restored by replacing low-cost parts when the seal fails or maintenance is required.

[0031] The foregoing description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A rotary water seal structure for a drill box with replaceable wear-resistant spacers, comprising a spindle (1), wherein the spindle (1) is mounted in a housing (4) via tapered roller bearings (3), a hydraulic motor (2) and a drill sleeve (6) are respectively connected to both ends of the spindle (1), a drill rod is inserted into the drill sleeve (6), a drill rod sealing ring (5) is installed in the annular groove on the inner side of the drill sleeve (6), a mudguard (7) is installed on the outside of the drill sleeve (6), a shaft head sealing O-ring (8) is installed between one end of the spindle (1) and the drill sleeve (6), the mudguard (7) and the hydraulic motor (2) are respectively fixedly connected to the housing (4) by internal hexagonal head screws, and a skeleton oil seal (9) is installed between the spindle (1), the housing (4) and the mudguard (7), characterized in that, Also includes: Water-sealed wear-resistant spacer (10), the water-sealed wear-resistant spacer (10) is installed on the outside of the main shaft (1) and is axially and radially positioned by elastic pin; The surface of the water-sealed wear-resistant spacer (10) is coated with a wear-resistant alloy coating; O-ring (11) for sealing the spacer sleeve; the water-sealed wear-resistant spacer sleeve (10) and the main shaft (1) are sealed by the spacer sleeve sealing O-ring (11); A water-sealing O-ring (12) is disposed in the annular cavity inside the housing (4) and forms a friction pair with the outer circle of the water-sealing wear-resistant spacer (10).

2. The rotary water seal structure for a drill box with a replaceable wear-resistant spacer according to claim 1, characterized in that: The tapered roller bearing (3) is installed and fixed by adjusting the preload with a round nut (13) and by cooperating with a retaining washer (14) and a washer (15).

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