Reinforced wear-free main shaft rotation power head

Abstract

The utility model discloses a reinforced abrasion-free main shaft rotation power head which comprises a gear box body, a first single-face framework oil seal and a first dustproof ring are installed between a gear box cover and a main shaft gear, and a first sealing steel sleeve is fixedly arranged on an output main shaft in a sleeved mode. A second single-face framework oil seal and a second dustproof ring are installed between the bearing end cover and the output main shaft, and the output main shaft is fixedly sleeved with a second sealing steel sleeve. And a main shaft outer space ring is propped between the outer rings of the tapered roller bearings. The surface abrasion resistance of the first sealing steel sleeve and the second sealing steel sleeve is greatly enhanced, the service life of the first sealing steel sleeve and the second sealing steel sleeve is long, the replacement cost is low, the main shaft outer space ring solves the problem of abrasion of the tapered roller bearing outer ring and the bearing seat hole caused by irregular alternating load on the rotary output main shaft, and the stability and the operation rigidity of the output main shaft are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of mining machinery equipment, and particularly relates to a reinforced non-wearing main shaft rotary power head. Background Technique

[0002] Mining machinery equipment mainly refers to professional machinery equipment used for mineral exploration, mining, and beneficiation, including prospecting machinery, mining machinery, beneficiation machinery, etc. Among them, mining machinery is an important representative of mining machinery equipment. According to the mining process, it can be divided into drilling machinery (pneumatic rock drills, down-the-hole drills, top hammer drills, etc.), tunneling machinery, and loading and hauling machinery, etc. Among them, the down-the-hole drill has the largest usage, and the rotary power head is one of the key components of the down-the-hole drill. Its service life is the main index for evaluating the quality of the down-the-hole drill and has an important impact on the entire process of mining.

[0003] The patent with the publication number of CN218267140U discloses a new type of rotary gearbox for down-the-hole drills, which includes a gearbox body, a gearbox cover, a front cover, an output main shaft, a main shaft gear, and a gear shaft. The gearbox cover is fixedly installed at the rear end of the gearbox body, the front cover is fixedly installed at the front end of the gearbox body, the main shaft gear is sleeved on the output main shaft, and the main shaft gear is located at one end of the gearbox body close to the gearbox cover; the gear shaft is a group, and a group of gear shafts meshes with the main shaft gear; an involute internal spline is provided on the outer end face of the gear shaft, and the gear shaft is driven by a bearingless cycloidal hydraulic motor with an involute spline output shaft.

[0004] When the above technical solution is used, in addition to normal sealing vulnerable parts, the long-term rotational friction at the contact points between the front and rear ends of the main shaft and the seals will cause wear of the main shaft and lead to seal failure, greatly reducing the service life of the main shaft. Replacing a new main shaft causes great economic losses. In addition, when the drill bit is tunneling, the main shaft of the rotary power head bears complex alternating loads, causing wear between the outer ring of the bearing and the bearing seat hole. The preload of the bearing decreases continuously with the increase of the wear amount, resulting in the main shaft of the rotary power head working in a state without preload and malfunctioning, reducing the service life of the rotary power head and causing relatively large economic losses. Content of the Utility Model

[0005] The purpose of the utility model is to provide a reinforced non-wearing main shaft rotary power head to solve the technical defects that the main shaft of the existing new type of rotary gearbox for down-the-hole drills is prone to wear and cause seal failure, and the service life of the rotary power head is short.

[0006] To achieve the above object, the present utility model provides the following technical solutions: A reinforced non-wearing spindle rotary power head, comprising a gear box body, one end of the gear box body is provided with a gear box cover, the other end of the gear box body is provided with a bearing end cover, a gear shaft is installed inside the gear box body, the gear shaft meshes with a main shaft gear, an output main shaft is installed in the inner hole of the main shaft gear, a first single-sided skeleton oil seal and a first dust-proof ring are arranged between the gear box cover and the main shaft gear, the output main shaft is rotatably installed inside the gear box body through a tapered roller bearing, a first single-sided skeleton oil seal and a first dust-proof ring are installed between the gear box cover and the main shaft gear, a first sealing steel sleeve is fixedly sleeved on the output main shaft, and the first single-sided skeleton oil seal and the first dust-proof ring are sleeved on the first sealing steel sleeve; a second single-sided skeleton oil seal and a second dust-proof ring are installed between the bearing end cover and the output main shaft, a second sealing steel sleeve is fixedly sleeved on the output main shaft, and the second single-sided skeleton oil seal and the second dust-proof ring are sleeved on the second sealing steel sleeve; there are two tapered roller bearings, and a main shaft outer spacer is abutted between the outer rings of the two tapered roller bearings, and the bearing end cover presses one of the outer rings of the tapered roller bearings to fix the outer rings of the two tapered roller bearings and the main shaft outer spacer.

[0007] As a further solution of the present utility model, an air inlet joint is provided at the rear end of the output main shaft, an air inlet sealing ring is sleeved at the connection between the air inlet joint and the output main shaft, a first dust-proof sealing ring pressing cover is sleeved between the air inlet joint and the gear box cover, the first dust-proof sealing ring pressing cover abuts against one end of the first dust-proof ring, and the air inlet joint does not contact the first sealing steel sleeve.

[0008] As a further solution of the present utility model, it further includes a first cylindrical roller bearing and four second cylindrical roller bearings, two of the second cylindrical roller bearings are installed on the gear box body, the other two second cylindrical roller bearings and the first cylindrical roller bearing are installed on the gear box cover, the main shaft gear, the gear box body and the gear box cover are all radially supported by the first cylindrical roller bearing, and a double-sided skeleton oil seal sleeved on the gear shaft is provided at the outer end of the first cylindrical roller bearing between the main shaft gear and the gear box cover.

[0009] As a preferred solution of the present utility model, a second dust-proof sealing ring pressing cover is installed on the bearing end cover, and the second dust-proof sealing ring pressing cover abuts against one end of the second dust-proof ring.

[0010] As a preferred solution of the present utility model, an adjusting gasket is provided between the bearing end cover and one end of the outer ring of the tapered roller bearing.

[0011] As a preferred solution of the present utility model, the outer diameter tolerance of the first sealing steel sleeve is matched with the first single-sided skeleton oil seal and the first dust-proof ring.

[0012] The outer diameter tolerance of the second sealing steel sleeve is matched with the second single-sided skeleton oil seal and the second dust-proof ring.

[0013] Compared with the prior art, the enhanced non-wearing main shaft rotary power head of the present utility model has the following beneficial effects:

[0014] 1. By adding a first sealing steel sleeve and a second sealing steel sleeve at the rotating friction part of the seals at both ends of the output main shaft, the output main shaft becomes a non-wearing main shaft rotary power head structure with sealing steel sleeves. Since the first sealing steel sleeve and the second sealing steel sleeve adopt a special heat treatment process for alloy materials, the surface wear resistance is greatly enhanced, and their own service life is longer. Even if there is wear, the replacement process is simple and fast, the technical requirements are low, it meets the on-site operation conditions, and the replacement cost is low.

[0015] 2. In the present utility model, a main shaft outer spacer is arranged at the outer rings of two tapered roller bearings at the front end of the output main shaft, and the bearing end cover presses on the outer rings of the tapered roller bearings to fix the outer rings of the two tapered roller bearings and the main shaft outer spacer. The height of the main shaft outer spacer is paired with the outer rings of the two tapered roller bearings to obtain the required bearing working preload clearance. This fixing method solves the wear problem of the outer rings of the tapered roller bearings and the bearing seat holes caused by the irregular alternating load on the rotary output main shaft, and improves the stability and running stiffness of the output main shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only individual cases of the embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0017] Figure 1 is a schematic cross-sectional structure diagram of an embodiment of the present utility model;

[0018] Figure 2 is Figure 1 an enlarged schematic diagram of the structure of part A in;

[0019] Figure 3 is Figure 1 an enlarged schematic diagram of the structure of part B in.

[0020] Reference numerals:

[0021] 1. Output main shaft; 2. Main shaft gear; 3. Gear shaft; 4. Gear box body; 401. Gear box cover; 402. Double-sided skeleton oil seal; 403. First dust-proof seal ring gland; 404. First single-sided skeleton oil seal; 405. First dust-proof ring; 406. Bearing end cover; 407. Second dust-proof seal ring gland; 408. Second single-sided skeleton oil seal; 409. Second dust-proof ring; 5. Air inlet joint; 501. Air inlet sealing ring; 6. First sealing steel sleeve; 7. First cylindrical roller bearing; 8. Tapered roller bearing; 801. Adjusting shim; 9. Second sealing steel sleeve; 10. Outer spacer of main shaft; 11. Second cylindrical roller bearing. Detailed implementation manners

[0022] In order to make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the following further describes the embodiments of the present utility model in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0023] In the description of the embodiments of the present utility model, it should be understood that the orientation or positional relationships indicated by the terms "upper", "lower", "front", "rear", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the embodiments of the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the embodiments of the present utility model.

[0024] In the description of the embodiments of the present utility model, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, an integral connection, or a detachable connection; it can be the communication inside two elements; it can be directly connected, or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to specific situations.

[0025] See Figures 1-3As shown in the figure, an enhanced non-wearing spindle rotary power head according to an embodiment of the present utility model includes: a gear box body 4, a gear box cover 401 is provided at one end of the gear box body 4, and a bearing end cover 406 is provided at the other end. A gear shaft 3 is installed inside the gear box body 4, the gear shaft 3 meshes with a main shaft gear 2, and an output main shaft 1 is installed in the inner hole of the main shaft gear 2. A first single-sided skeleton oil seal 404 and a first dust-proof ring 405 are provided between the gear box cover 401 and the main shaft gear 2. The output main shaft 1 is rotatably installed inside the gear box body 4 through a tapered roller bearing 8. A first single-sided skeleton oil seal 404 and a first dust-proof ring 405 are installed between the gear box cover 401 and the main shaft gear 2. A first sealing steel sleeve 6 is fixedly sleeved on the output main shaft 1, and the first single-sided skeleton oil seal 404 and the first dust-proof ring 405 are sleeved on the first sealing steel sleeve 6; a second single-sided skeleton oil seal 408 and a second dust-proof ring 409 are installed between the bearing end cover 406 and the output main shaft 1. A second sealing steel sleeve 9 is fixedly sleeved on the output main shaft 1, and the second single-sided skeleton oil seal 408 and the second dust-proof ring 409 are sleeved on the second sealing steel sleeve 9; there are two tapered roller bearings 8, and a main shaft outer spacer 10 abuts between the outer rings of the two tapered roller bearings 8. The bearing end cover 406 presses the outer ring of one of the tapered roller bearings 8 to fix the outer rings of the two tapered roller bearings 8 and the main shaft outer spacer 10.

[0026] Through the above technical solution, the first sealing steel sleeve 6 and the second sealing steel sleeve 9 are added at the rotating friction parts of the seals at both ends of the output main shaft 1, so that the output main shaft 1 becomes a non-wearing spindle rotary power head structure with a sealing steel sleeve. Since the first sealing steel sleeve 6 and the second sealing steel sleeve 9 adopt a special heat treatment process for alloy materials, the surface wear resistance is greatly enhanced, and their own service life is longer. Even if there is wear, the replacement process is simple and fast, the technical requirements are low, which meets the on-site operation conditions, and the replacement cost is low. By setting the main shaft outer spacer 10 at the outer rings of the two tapered roller bearings 8 at the front end of the output main shaft 1, the bearing end cover 406 presses the outer ring of the tapered roller bearing 8 to fix the outer rings of the two tapered roller bearings 8 and the main shaft outer spacer 10. The height of the main shaft outer spacer 10 is paired with the outer rings of the two tapered roller bearings 8 to obtain the required bearing working preload clearance. This fixing method solves the problem of wear between the outer ring of the tapered roller bearing 8 and the bearing seat hole caused by the irregular alternating load on the rotary output main shaft 1, and improves the stability and running stiffness of the output main shaft 1.

[0027] An air inlet joint 5 is provided at the rear end of the output main shaft 1. An air inlet sealing ring 501 is sleeved at the connection between the air inlet joint 5 and the output main shaft 1. A first dust-proof sealing ring pressing cover 403 is sleeved between the air inlet joint 5 and the gear box cover 401. The first dust-proof sealing ring pressing cover 403 abuts against one end of the first dust-proof ring 405, and the air inlet joint 5 does not contact the first sealing steel sleeve 6.

[0028] The intake sealing ring 501 is used to strengthen the seal at the connection between the intake joint 5 and the output main shaft. The first dust-proof sealing ring gland 403 abuts against one end of the first dust-proof ring 405, which can effectively ensure the dust-proof performance of this part and enhance the sealing effect. In addition, the intake joint 5 does not contact the first sealing steel sleeve 6, avoiding wear caused by the contact between the first sealing steel sleeve 6 and the intake joint 5.

[0029] An enhanced non-wearing main shaft rotary power head according to an embodiment of the present invention further includes a first cylindrical roller bearing 7 and four second cylindrical roller bearings 11. Among them, two second cylindrical roller bearings 11 are installed on the gear housing 4, and the other two second cylindrical roller bearings 11 and the first cylindrical roller bearing 7 are installed on the gear box cover 401. The main shaft gear 2, the gear housing 4, and the gear box cover 401 are all radially supported by the first cylindrical roller bearing 7. A double-sided skeleton oil seal 402 sleeved on the gear shaft 3 is provided at the outer end of the first cylindrical roller bearing 7 between the main shaft gear 2 and the gear box cover 401.

[0030] The first cylindrical roller bearing 7 has good load-bearing capacity, can provide high rotational accuracy and low vibration noise. When bearing loads, it has small deformation and good rigidity. The double-sided skeleton oil seal 402 has excellent sealing performance. The two sealing lips can enhance the prevention of fluid leakage and the blocking of external impurities from entering, which helps to improve the operating efficiency and reliability of the gear shaft 3 and extend the service life of the gear shaft 3.

[0031] A second dust-proof sealing ring gland 407 is installed on the bearing end cover 406, and the second dust-proof sealing ring gland 407 abuts against one end of the second dust-proof ring 409. The second dust-proof sealing ring gland 407 abuts against one end of the second dust-proof ring 409, which can effectively ensure the dust-proof performance of this part and enhance the sealing effect.

[0032] An adjusting shim 801 is provided between the bearing end cover 406 and one end of the outer ring of the tapered roller bearing 8. The adjusting shim 801 is used to fill the small gap between the bearing end cover 406 and one end of the outer ring of the tapered roller bearing 8, making the fit more tight and precise.

[0033] The outer diameter tolerance of the first sealing steel sleeve 6 is matched with the first single-sided skeleton oil seal 404 and the first dust-proof ring 405; the outer diameter tolerance of the second sealing steel sleeve 9 is matched with the second single-sided skeleton oil seal 408 and the second dust-proof ring 409, which can ensure that the first sealing steel sleeve 6 and the second sealing steel sleeve 9 are both wear-resistant and have the designed sealing effect, suitable for the working conditions of heavy load and large impact load of down-the-hole drills.

[0034] Working principle of the embodiment of the utility model: At the rotating friction parts of the seals at both ends of the output main shaft 1, a first sealing steel sleeve 6 and a second sealing steel sleeve 9 are added, making the output main shaft 1 into a non-wearing main shaft rotary power head structure with sealing steel sleeves. Since the first sealing steel sleeve 6 and the second sealing steel sleeve 9 adopt a special heat treatment process for alloy materials, the surface wear resistance is greatly enhanced, and their own service life is longer. Even if there is wear, the replacement process is simple and fast, with low technical requirements, meeting the on-site operation conditions and low replacement costs.

[0035] A main shaft outer spacer 10 is arranged at the outer rings of two tapered roller bearings 8 at the front end of the output main shaft 1. The bearing end cover 406 presses on the outer rings of the tapered roller bearings 8 to fix the outer rings of the two tapered roller bearings 8 and the main shaft outer spacer 10. The height of the main shaft outer spacer 10 is paired with the outer rings of the two tapered roller bearings 8 to obtain the required preload clearance for the bearings to work. This fixing method solves the wear problem of the outer rings of the tapered roller bearings 8 and the bearing seat holes caused by the irregular alternating load on the rotating output main shaft 1, and improves the stability and running stiffness of the output main shaft 1.

[0036] Installation of the first sealing steel sleeve 6 and the second sealing steel sleeve 9 by the thermal expansion method: To not affect the assembly accuracy of the output main shaft 1 and protect the output main shaft 1, there is a certain interference between the inner hole tolerance of the first sealing steel sleeve 6 and the second sealing steel sleeve 9 and the outer diameter tolerance of the output main shaft 1. The first sealing steel sleeve 6 and the second sealing steel sleeve 9 are installed by the method of electromagnetic induction or oil immersion heating of the sealing steel sleeves. The outer diameter tolerance of the first sealing steel sleeve 6 and the second sealing steel sleeve 9 is matched with the seal, which can ensure the design and use effect of the first sealing steel sleeve 6 and the second sealing steel sleeve 9 being both wear-resistant and sealed, suitable for the working conditions of heavy load and large impact load of down-the-hole drills. The output main shaft 1 is tightly connected with the first sealing steel sleeve 6 and the second sealing steel sleeve 9 and relies on friction drive. When replacing and disassembling, the assembly accuracy of the output main shaft 1 is not damaged.

[0037] Installation of the main shaft outer spacer 10 by the pre-tightening selection method: To ensure that there is a certain preload between the outer ring of the tapered roller bearing 8 and the main shaft outer spacer of the output main shaft 1 during installation, during assembly, the preload of the tapered roller bearing 8 is adjusted by adjusting the shim 801 between the bearing end cover 406 and the outer ring of the tapered roller bearing 8 to obtain a certain working preload clearance for the tapered roller bearing 8. The characteristic of this installation method is that the adjustment is simple and convenient, which can ensure that the rotating output main shaft 1 requires an appropriate preload to ensure the stiffness and load-bearing capacity of the output main shaft 1, reduce the wear of the tapered roller bearing 8, and improve the service life of the rotary power head.

[0038] The basic principles of the present invention have been shown and described above. The above is only the preferred embodiment of the present invention and is not intended to limit the present invention. The descriptions in the above embodiments and the specification only illustrate the principles of the present invention. Without departing from the scope of the present invention, any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention shall be included within the protection scope of the present invention.

Claims

1. A reinforced wear-free spindle rotary power head, comprising a gear box (4), one end of the gear box (4) is provided with a gear box cover (401), and the other end is provided with a bearing end cover (406), a gear shaft (3) is installed inside the gear box (4), the gear shaft (3) is meshed with a spindle gear (2), an output spindle (1) is installed in the inner hole of the spindle gear (2), a first single-sided skeleton oil seal (404) and a first dust ring (405) are provided between the gear box cover (401) and the spindle gear (2), the output spindle (1) is rotatably installed inside the gear box (4) through a tapered roller bearing (8), and is characterized in that: A first single-sided skeleton oil seal (404) and a first dust ring (405) are installed between the gear box cover (401) and the main shaft gear (2); a first sealing steel sleeve (6) is fixedly sleeved on the output main shaft (1); and the first single-sided skeleton oil seal (404) and the first dust ring (405) are sleeved on the first sealing steel sleeve (6); A second single-sided skeleton oil seal (408) and a second dust ring (409) are installed between the bearing end cover (406) and the output main shaft (1); a second sealing steel sleeve (9) is fixedly sleeved on the output main shaft (1); and the second single-sided skeleton oil seal (408) and the second dust ring (409) are sleeved on the second sealing steel sleeve (9); Two tapered roller bearings (8) are provided, and a main shaft outer spacer (10) is abutted between the outer rings of the two tapered roller bearings (8), and the bearing end cover (406) presses one of the outer rings of the tapered roller bearings (8) to fix the two outer rings of the tapered roller bearings (8) and the main shaft outer spacer (10).

2. The reinforced wear-free spindle rotary power head according to claim 1, characterized in that: An air intake joint (5) is provided at the rear end of the output main shaft (1); an air intake sealing ring (501) is sleeved at the connection between the air intake joint (5) and the output main shaft (1); a first dustproof sealing ring gland (403) is sleeved between the air intake joint (5) and the gear box cover (401); the first dustproof sealing ring gland (403) abuts against one end of the first dustproof ring (405), and the air intake joint (5) does not contact the first sealing steel sleeve (6).

3. The reinforced wear-free spindle rotary power head according to claim 2, characterized in that: It also comprises a first cylindrical roller bearing (7) and four second cylindrical roller bearings (11), wherein two of the second cylindrical roller bearings (11) are mounted on the gear box body (4), and the other two of the second cylindrical roller bearings (11) and the first cylindrical roller bearing (7) are mounted on the gear box cover (401); the main shaft gear (2), the gear box body (4) and the gear box cover (401) are all radially supported by the first cylindrical roller bearing (7); and the outer end of the first cylindrical roller bearing (7) between the main shaft gear (2) and the gear box cover (401) is provided with a double-sided skeleton oil seal (402) sleeved on the gear shaft (3).

4. The reinforced wear-free spindle rotary power head according to claim 1, characterized in that: A second dustproof seal ring pressure cover (407) is mounted on the bearing end cover (406), and the second dustproof seal ring pressure cover (407) abuts against one end of the second dustproof ring (409).

5. The reinforced wear-free spindle rotary power head according to claim 1, characterized in that: An adjustment gasket (801) is provided between the bearing end cover (406) and one end of the outer ring of the tapered roller bearing (8).

6. The reinforced wear-free spindle rotary power head according to claim 1, characterized in that: The outer diameter tolerance of the first sealing steel sleeve (6) matches that of the first single-sided skeleton oil seal (404) and the first dustproof ring (405); The outer diameter tolerance of the second sealing steel sleeve (9) matches that of the second single-sided skeleton oil seal (408) and the second dustproof ring (409).

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