Non-sealing mining roller bit

Abstract

A cone is arranged on a shaft neck of a cone palm in a sleeving mode, a bearing structure is formed between the shaft neck and the cone by arranging a small pin roller and a large pin roller, a large pin roller groove is formed in the inner wall of the cone, the large pin roller is arranged in the large pin roller groove, and the small pin roller is arranged in the large pin roller groove. An annular air groove is formed in the position, located at the root of the shaft neck, between the shaft neck and the cone, the cone leg is provided with a main air inlet channel, air enters the axial outer end of the main air inlet channel, and the inner end of the main air inlet channel is communicated with a first air channel, a second air channel and a third air channel. The first air channel penetrates through the bit leg and discharges air from the throat part of the bit leg, the second air channel extends to the bearing structure of the shaft neck from the interior of the bit leg, and the third air channel extends to the annular air groove from the interior of the bit leg. The large roller groove is located in the inner hole of the cone and is not prone to toppling, the service life is prolonged, and meanwhile the annular air grooves are formed in the bottom plane of the cone and the root of the shaft neck to prevent rock debris from entering the bearing.

Description

Technical Field

[0001] The invention relates to the technical field of roller drill bits, in particular to a non-sealed roller drill bit for mining. Background Art

[0002] The non-sealed mining roller drill bit consists of three teeth and three teeth. The tooth journal and the inner hole of the tooth constitute a bearing pair. Large rollers, steel balls and small rollers are installed between the journal and the inner hole. Among them, the large roller is installed in the large roller groove on the journal. The purpose of this design is to facilitate the rock chips entering the bearing to be discharged more easily by compressed air. However, this design makes it easy for the large roller to fall over after the tip of the tooth is worn, which seriously affects the life of the bearing. In addition, the journal diameter is limited to a certain extent, resulting in insufficient bearing capacity. Summary of the invention

[0003] Purpose of the invention: In order to overcome the shortcomings of the background technology, the present invention discloses a non-sealed mining roller drill bit.

[0004] Technical solution: The non-sealed mining roller drill bit disclosed in the present invention has a roller sleeve arranged on the shaft neck of a tooth palm, and a bearing structure is formed between the shaft neck and the roller by arranging small rollers and large rollers, the small roller is located on the top side of the inner part of the roller, and the large roller is located on the bottom side of the inner part of the roller; a large roller groove is arranged on the inner wall of the roller, and the large roller is arranged in the large roller groove; an annular air groove is arranged between the shaft neck and the roller and at the root of the shaft neck; the tooth palm is provided with a main air intake channel, and the main air intake channel intakes air axially from the outer end, and the inner end is connected to the first air channel, the second air channel and the third air channel; the first air channel passes through the tooth palm and exhausts air at the throat of the tooth palm, the second air channel extends from the inside of the tooth palm to the bearing structure of the shaft neck, and the third air channel extends from the inside of the tooth palm to the annular air groove.

[0005] Furthermore, the height and diameter of the large roller are larger than those of the small roller.

[0006] Furthermore, a small roller groove is provided on the outer wall of the journal, and the small roller is placed in the small roller groove.

[0007] Furthermore, a steel ball is provided between the journal and the gear and between the small roller and the large roller.

[0008] Furthermore, the axial bottom of the gear and the corresponding surface of the tooth palm form a tortuous channel through an annular concave-convex structure, and the top spacing of the annular concave-convex structure is larger than the two side spacings, forming an annular air groove in the tortuous channel.

[0009] Furthermore, a slag blocking pipe is provided at the air inlet of the second air duct, and the surface of the slag blocking pipe is covered with slag blocking holes.

[0010] Furthermore, the air outlet of the third air channel is provided with a first air groove, and the first air groove extends from the air outlet of the third air channel to the palm 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, and the inlets of the second air passage and the third air passage are located on the side wall of the main air intake passage.

[0013] Beneficial effects: Compared with the prior art, the advantages of the present invention are as follows: the large roller groove is located in the inner hole of the gear, and the large roller will not fall over due to wear of the palm tip, thereby extending the service life of the bearing; at the same time, the concave-convex structure is provided on the bottom plane of the gear and the root of the shaft neck to increase the difficulty of rock chips entering the bearing. When the compressed air enters the annular air groove composed of the concave-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 tooth. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is an overall stereogram of the present invention; Figure 2 It is a three-dimensional diagram of the palm of the tooth of the present invention; Figure 3 is a cross-sectional view of the palm of the tooth at the second airway of the present invention; Figure 4 It is a cross-sectional view of the palm of the tooth of the present invention at the third airway. DETAILED DESCRIPTION

[0015] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0016] like Figure 1-4 The non-sealed mining roller drill bit shown in the figure has a roller 1 sleeved on the shaft neck 3 of the tooth palm 2, and a bearing structure is formed between the shaft neck 3 and the roller 1 by arranging a small roller 4 and a large roller 5. The small roller 4 is located on the top side of the roller 1, and the large roller 5 is located on the bottom side of the roller 1. The height and diameter of the large roller 5 are both larger than those of the small roller 4.

[0017] A steel ball 13 is provided between the journal 3 and the gear 1 and between the small roller 4 and the large roller 5 .

[0018] The inner wall of the gear wheel 1 is provided with a large roller groove 6, the large roller 5 is arranged in the large roller groove 6, the outer wall of the journal 3 is provided with a small roller groove 12, the small roller 4 is placed in the small roller groove 12, and the arrangement form makes the large roller 5 not easy to tip over.

[0019] An annular air groove 7 is provided between the journal 3 and the gear 1, at the root of the journal 3. The axial bottom of the gear 1 and the corresponding surface of the tooth palm 2 form a tortuous channel through an annular concave-convex structure. The top spacing of the annular concave-convex structure is larger than the two side spacings, forming an annular air groove 7 in the tortuous channel.

[0020] The tooth palm 2 is provided with a main air intake channel 8, the main air intake channel 8 is axially air intake at the outer end, and the inner end is connected to the first air channel 9, the second air channel 10 and the third air channel 11. The inlet of the first air channel 9 is located at the bottom of the main air intake channel 8, and the inlets of the second air channel 10 and the third air channel 11 are located on the side wall of the main air intake channel 8.

[0021] The first air passage 9 passes through the tooth palm 2 and exhausts air at the throat of the tooth palm. This air passage is the main air passage, and most of the compressed air is discharged from it.

[0022] The second air passage 10 extends from the inside of the tooth palm 2 to the bearing structure of the journal 3, and a small amount of compressed air enters the bearing structure to cool it. A slag blocking pipe 14 is arranged at the air inlet of the second air passage 10, and the surface of the slag blocking pipe 14 is covered with slag blocking holes.

[0023] The third air channel 11 extends from the inside of the palm 2 to the annular air groove 7. The air outlet of the third air channel 11 is provided with a first air groove 15. The first air groove 15 extends from the air outlet of the third air channel 11 to the throat of the palm. 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 passage. A small part of the compressed air enters the annular air groove 7 from the third air channel 11, and the other part blows away the rock debris accumulated in the throat of the palm along the first air groove 15. The high-pressure gas in the annular air groove 7 is discharged from the second air groove 16, and the internal rock debris is taken away at the same time.

[0024] The roller drill bit in the present application was verified on the spot with the conventional non-sealed roller drill bit. The average service life of the roller drill bit in the present application was about 15% higher than that of the conventional non-sealed roller drill bit.

Claims

1. A non-sealed mining roller drill bit, characterized in that: The gear (1) is sleeved on the journal (3) of the tooth palm (2); a small roller (4) and a large roller (5) are arranged between the journal (3) and the gear (1) to form a bearing structure; the small roller (4) is located on the top side of the gear (1); the large roller (5) is located on the bottom side of the gear (1); a large roller groove (6) is arranged on the inner wall of the gear (1); the large roller (5) is arranged in the large roller groove (6); and a bearing structure is formed between the journal (3) and the gear (1) and at the root of the journal (3). An annular air groove (7) is provided at the position of the tooth palm (2); a main air intake channel (8) is provided on the tooth palm (2); the main air intake channel (8) intakes air axially from the outer end, and the inner end is connected to a first air channel (9), a second air channel (10) and a third air channel (11); the first air channel (9) passes through the tooth palm (2) and exhausts air at the throat of the tooth palm; the second air channel (10) extends from the inside of the tooth palm (2) to the bearing structure of the shaft neck (3); and the third air channel (11) extends from the inside of the tooth palm (2) to the annular air groove (7).

2. The unsealed mining roller drill bit according to claim 1, characterized in that: The large roller (5) is larger in height and diameter than the small roller (4).

3. The unsealed mining roller drill bit according to claim 1, characterized in that: 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).

4. The unsealed mining roller drill bit according to claim 1, characterized in that: A steel ball (13) is provided between the journal (3) and the gear (1) and between the small roller (4) and the large roller (5).

5. The unsealed mining roller drill bit according to claim 1, characterized in that: The axial bottom of the cone (1) and the corresponding surface of the cone palm (2) form a tortuous channel through an annular concave-convex structure, and the top spacing of the annular concave-convex structure is larger than the two side spacings, forming an annular air groove (7) in the tortuous channel.

6. The unsealed mining roller drill bit according to claim 1, characterized in that: A slag blocking pipe (14) is provided at the air inlet of the second air channel (10), and the surface of the slag blocking pipe (14) is covered with slag blocking holes.

7. The unsealed mining roller drill bit according to claim 1, characterized in that: The air outlet of the third air channel (11) is provided with a first air groove (15), and the first air groove (15) extends from the air outlet of the third air channel (11) to the palm throat.

8. The unsealed mining roller drill bit according to claim 5, characterized in that: A second air groove (16) is provided 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 unsealed mining roller drill bit according to claim 1, characterized in that: The inlet of the first air channel (9) is located at the bottom of the main air intake channel (8), and the inlets of the second air channel (10) and the third air channel (11) are located on the side wall of the main air intake channel (8).

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