Non-sealing mining roller bit
By incorporating a bearing structure with small and large rollers in the roller cone drill bit, combined with an annular air groove and air passage design, the problems of short bearing life and insufficient load-bearing capacity are solved, achieving more efficient cuttings removal and bearing protection.
Patent Information
- Application Number
- CN202520333393.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-28
- Publication Date
- 2025-12-26
- Estimated Expiration
- 2035-02-28
AI Technical Summary
Existing non-sealed mining roller cone drill bits have short bearing life and insufficient load-bearing capacity, mainly due to the large rollers being prone to tipping over and the difficulty in effectively removing rock cuttings.
Small and large rollers are set between the roller and the journal to form a bearing structure, and annular air grooves and concave-convex structures are set on the inner wall of the roller and the outer wall of the journal. Efficient gas flow is achieved through the main, second and third air passages to clean up rock debris and prevent it from entering the bearing.
It extends the service life of the bearing, improves the load-bearing capacity, effectively removes rock chips, and enhances the overall service life of the roller cone drill bit.
Smart Images
Figure CN223724526U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of roller cone bits, in particular to a non-sealed mine roller cone bit. BACKGROUND
[0002] The non-sealed mine roller cone bit is composed of three pieces of a shoe and three pieces of a cone, a bearing pair is formed by a shaft neck of the shoe and an inner hole of the cone, and a large roller, a steel ball and a small roller are arranged between the shaft neck and the inner hole, wherein the large roller is arranged in a large roller groove on the shaft neck, the purpose of this design is to make the rock debris in the bearing interior more easily discharged by compressed air, however, the large roller is prone to tilting after the tip of the shoe is worn, which seriously affects the service life of the bearing, and in addition, the diameter of the shaft neck is limited, resulting in insufficient bearing capacity. SUMMARY
[0003] The utility model discloses a non-sealed mine roller cone bit.
[0004] Technical scheme: the non-sealed mine roller cone bit disclosed by the utility model, the cone is sleeved on the shaft neck of the shoe, a bearing structure is formed by arranging a small roller and a large roller between the shaft neck and the cone, the small roller is located at the top side of the inner hole of the cone, the large roller is located at the bottom side of the inner hole of the cone, a large roller groove is arranged on the inner wall of the cone, the large roller is arranged in the large roller groove, a ring-shaped air groove is arranged between the shaft neck and the cone and at the root of the shaft neck, the shoe is provided with a main air inlet channel, the main air inlet channel is axially provided with an air inlet at the outer end and is connected with a first air duct, a second air duct and a third air duct at the inner end, the first air duct penetrates the shoe and is provided with an air outlet at the throat of the shoe, the second air duct extends from the inside of the shoe to the bearing structure of the shaft neck, and the third air duct extends from the inside of the shoe to the ring-shaped air groove.
[0005] Further, the height and diameter of the large roller are greater than those of the small roller.
[0006] Further, a small roller groove is formed in the outer wall of the shaft neck, and the small roller is arranged in the small roller groove.
[0007] Further, a steel ball is arranged between the small roller and the large roller between the shaft neck and the cone.
[0008] Further, a zigzag channel is formed by a ring-shaped concave-convex structure between the axially bottom of the cone and the corresponding surface of the shoe, the top of the ring-shaped concave-convex structure is spaced apart greater than the two sides, and a ring-shaped air groove is formed in the zigzag channel.
[0009] Further, a slag blocking pipe is arranged at the air inlet of the second air duct, and the surface of the slag blocking pipe is provided with slag blocking holes.
[0010] Furthermore, the air outlet of the third airway is provided with a first air groove, which extends from the air outlet of the third airway to the tooth, palm, and throat.
[0011] Furthermore, a second air groove is provided at the annular concave-convex structure, and the second air groove extends from the annular air groove to the outside of the tortuous channel.
[0012] Furthermore, the inlet of the first air passage is located at the bottom of the main air intake passage, while the inlets of the second and third air passages are located on the side wall of the main air intake passage.
[0013] Beneficial effects: Compared with the prior art, the advantages of this utility model are: the large roller groove is located in the inner hole of the roller cone, and the large roller will not tilt due to the wear of the palm tip, which can extend the service life of the bearing; at the same time, the concave and convex structure opened at the bottom plane of the roller cone and the root of the journal can increase the difficulty of rock chips entering the bearing. When compressed air enters the annular air groove composed of the concave and convex structure, it can not only further form a barrier to prevent rock chips from entering the bearing, but also directly clean the rock chips accumulated in the throat of the roller cone. Attached Figure Description
[0014] Figure 1 This is a perspective view of the entire utility model;
[0015] Figure 2 This is a three-dimensional view of the palmar tooth of this utility model;
[0016] Figure 3 This is a cross-sectional view of the palmar tooth of this utility model at the second airway;
[0017] Figure 4 This is a cross-sectional view of the palmar tooth of this utility model at the third airway. Detailed Implementation
[0018] The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments.
[0019] like Figures 1-4 The non-sealed mining roller cone bit shown has a roller cone 1 mounted on a journal 3 of a toothed bit 2. A bearing structure is formed between the journal 3 and the roller cone 1 by setting small rollers 4 and large rollers 5. The small rollers 4 are located on the top side inside the roller cone 1, and the large rollers 5 are located on the bottom side inside the roller cone 1. The height and diameter of the large rollers 5 are both greater than those of the small rollers 4.
[0020] A steel ball 13 is provided between the journal 3 and the roller 1, located between the small roller 4 and the large roller 5.
[0021] The inner wall of the toothed wheel 1 is provided with a large roller groove 6, and the large roller 5 is provided in the large roller groove 6. The outer wall of the journal 3 is provided with a small roller groove 12, and the small roller 4 is placed in the small roller groove 12. With this arrangement, the large roller 5 is not easy to tip over.
[0022] The annular air groove 7 is arranged between the shaft journal 3 and the roller 1 at the root of the shaft journal 3. The corresponding surface of the roller 1 and the shoe 2 is connected by the annular concave-convex structure to form a tortuous channel. The top of the annular concave-convex structure is spaced apart by a distance greater than the distance between the two sides, and the annular air groove 7 is formed in the tortuous channel.
[0023] The shoe 2 is provided with a main air inlet channel 8. The main air inlet channel 8 is axially connected to the first air passage 9, the second air passage 10 and the third air passage 11. The inlet of the first air passage 9 is located at the bottom of the main air inlet channel 8, and the inlets of the second air passage 10 and the third air passage 11 are located on the side wall of the main air inlet channel 8.
[0024] The first air passage 9 extends through the shoe 2 and discharges at the throat of the shoe. This air passage is the main air passage, and most of the compressed air is discharged through this passage.
[0025] The second air passage 10 extends from the inside of the shoe 2 to the bearing structure of the shaft journal 3. A small amount of compressed air enters the bearing structure through the second air passage 10 to cool it. The air inlet of the second air passage 10 is provided with a slag retaining pipe 14, and the surface of the slag retaining pipe 14 is covered with slag retaining holes.
[0026] The third air passage 11 extends from the inside of the shoe 2 to the annular air groove 7. The outlet of the third air passage 11 is provided with a first air groove 15. The first air groove 15 extends from the outlet of the third air passage 11 to the throat of the shoe. The annular concave-convex structure is provided with a second air groove 16. The second air groove 16 extends from the annular air groove 7 to the outside of the tortuous channel. A small amount of compressed air enters the annular air groove 7 through the third air passage 11, and another part blows away the rock debris accumulated at the throat of the shoe along the first air groove 15. The high-pressure gas in the annular air groove 7 is discharged through the second air groove 16, while the internal rock debris is also removed.
[0027] The roller bit in the present application is compared with the conventional non-sealed roller bit in the field test. The average service life of the roller bit in the present application is about 15% higher than that of the conventional non-sealed roller bit.
Claims
1. A non-sealed mine bit, characterized by: The tooth roller (1) is sleeved on the shaft neck (3) of the tooth holder (2), a bearing structure is formed between the shaft neck (3) and the tooth roller (1) by arranging small rollers (4) and large rollers (5), the small rollers (4) are located on the top side of the tooth roller (1), the large rollers (5) are located on the bottom side of the tooth roller (1), a large roller groove (6) is arranged on the inner wall of the tooth roller (1), the large rollers (5) are arranged in the large roller groove (6), an annular air groove (7) is arranged between the shaft neck (3) and the tooth roller (1) and at the root of the shaft neck (3), the tooth holder (2) is provided with a main air inlet channel (8), the main air inlet channel (8) is axially provided with an air inlet at the outer end and is connected with a first air channel (9), a second air channel (10) and a third air channel (11) at the inner end; the first air channel (9) penetrates through the tooth holder (2) and is provided with an air outlet at the throat of the tooth holder, the second air channel (10) extends from the inside of the tooth holder (2) to the bearing structure of the shaft neck (3), and the third air channel (11) extends from the inside of the tooth holder (2) to the annular air groove (7).
2. The non-sealed mine bit of claim 1, wherein: The height and diameter of the large roller (5) are greater than those of the small roller (4).
3. The non-sealed mining cone bit of claim 1, wherein: A small roller groove (12) is arranged on the outer wall of the shaft neck (3), and the small roller (4) is arranged in the small roller groove (12).
4. The non-sealed mining cone bit of claim 1, wherein: A steel ball (13) is arranged between the small roller (4) and the large roller (5) between the shaft neck (3) and the tooth roller (1).
5. The non-sealed mining cone bit of claim 1, wherein: The axial bottom of the tooth roller (1) and the corresponding surface of the tooth holder (2) are connected through an annular concave-convex structure to form a zigzag channel, the top interval of the annular concave-convex structure is greater than the side interval, and the annular air groove (7) is formed in the zigzag channel.
6. The non-sealed mining cone bit of claim 1, wherein: A slag blocking pipe (14) is arranged at the air inlet of the second air channel (10), and the surface of the slag blocking pipe (14) is provided with slag blocking holes.
7. The non-sealed mining cone bit of claim 1, wherein: A first air groove (15) is arranged at the air outlet of the third air channel (11), and the first air groove (15) extends from the air outlet of the third air channel (11) to the throat of the tooth holder.
8. The non-sealed rock bit of claim 5 wherein: A second air groove (16) is arranged at the annular concave-convex structure, and the second air groove (16) extends from the annular air groove (7) to the outside of the zigzag channel.
9. The non-sealed rock bit of claim 1, wherein: The air inlet of the first air channel (9) is located at the bottom of the main air inlet channel (8), and the air inlets of the second air channel (10) and the third air channel (11) are located at the side wall of the main air inlet channel (8).