Rotary speed reducer for down-the-hole drill

Abstract

The utility model belongs to the technical field of engineering machinery, and discloses a rotary speed reducer for a down-the-hole drill, which comprises a shell component, a speed reducing mechanism and a main shaft, the speed reducing mechanism is arranged in the shell component, the main shaft is rotatably connected to the shell component, a first end of the main shaft is connected with the speed reducing mechanism, and a second end of the main shaft extends out of the shell component. The main shaft is axially provided with a first air channel penetrating to the second end of the main shaft, the side wall, located in the shell assembly, of the main shaft is provided with a second air channel communicated with the first air channel, the shell assembly is provided with an air cavity and an air conveying hole communicated with the air cavity, and the second air channel is arranged in the air cavity in a communicated mode. According to the rotary speed reducer for the down-the-hole drill, the arrangement structure of the air channel in the main shaft is improved, the overall size of the speed reducer is reduced, the arrangement space of an internal speed reducing mechanism is prevented from being affected, high-pressure gas can be reliably and effectively conveyed, the gas leakage probability is reduced, and the service life of the speed reducer is prolonged. And the reliability and the stability of the high-pressure gas responding to the impactor are ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of engineering machinery, in particular to a rotary reducer for a down-the-hole drill. Background Art

[0002] Slewing reducers are primarily used in down-the-hole drill rigs used in open-pit mines, serving as the driving and slewing mechanism for the drill. During rock drilling, the slewing reducer provides downward force and slewing torque for the impactor. Furthermore, a high-pressure compressed air passage is provided on the main shaft of the slewing reducer, providing the impactor with high-frequency rock impact power and blowing out the crushed rock debris, enabling rock drilling.

[0003] In the prior art, the air duct of the main shaft of a rotary reducer is generally arranged to be opened through the main shaft in the axial direction. This arrangement, on the one hand, requires the main shaft to be thickened to ensure its strength, as the main shaft opening is hollow. This increases the overall size of the rotary reducer and also takes up space for the reduction mechanism within the rotary reducer. On the other hand, the through-type air duct along the main shaft axial direction also increases the length of the gas transmission channel, which increases the distance high-pressure gas is transported during use. This makes the transportation process more prone to gas leaks and gas supply delays, affecting the pressure ultimately applied to the impactor. Utility Model Content

[0004] The purpose of the utility model is to provide a rotary reducer for a down-the-hole drill, which improves the layout structure of the air duct in the main shaft, reduces the overall size of the reducer, avoids affecting the layout space of the internal reduction mechanism, and ensures reliable and effective delivery of high-pressure gas.

[0005] To achieve this purpose, the present invention adopts the following technical solutions:

[0006] A rotary reducer for a down-the-hole drill, comprising:

[0007] housing assembly;

[0008] a speed reduction mechanism, disposed in the housing assembly;

[0009] The main shaft is rotatably connected to the housing assembly, the first end of the main shaft is connected to the reduction mechanism, the second end of the main shaft extends out of the housing assembly, the main shaft is provided with a first air channel extending to its second end along its own axial direction, the side wall of the main shaft located in the housing assembly is provided with a second air channel connected to the first air channel, the housing assembly is provided with an air cavity and an air delivery hole connected to the air cavity, and the second air channel is connected in the air cavity.

[0010] Preferably, a plurality of the second air channels are provided, and the plurality of the second air channels are evenly spaced apart along the circumference of the main shaft.

[0011] Preferably, the reduction mechanism includes a primary planetary gear set and a secondary planetary gear set; wherein,

[0012] The first-stage planetary gear set includes a first-stage sun gear, a first-stage planet carrier, a first-stage planet gear, and a first-stage ring gear. The first-stage planet gear is rotatably mounted on the first-stage planet carrier, the first-stage sun gear is rotatably connected to the housing assembly, the first-stage ring gear is fixed in the housing assembly, and the first-stage planet gears are meshed with the first-stage ring gear and the first-stage sun gear, respectively.

[0013] The secondary planetary gear set includes a secondary sun gear, a secondary planet carrier, a secondary planet gear and a secondary ring gear. The secondary planet gear is rotatably arranged on the secondary planet carrier. The secondary sun gear is fixedly connected to the primary planet carrier. The secondary ring gear is fixed in the housing assembly. The secondary planet gears are respectively meshed with the secondary ring gear and the secondary sun gear. The secondary planet carrier is fixedly connected to the main shaft.

[0014] Preferably, the shell assembly includes an upper end cover and a main shell body, the upper end cover is fixedly connected to the main shell body, the upper end cover and the main shell body together form an accommodating cavity, the deceleration mechanism is arranged in the accommodating cavity, and the first end of the main shaft extends into the accommodating cavity and is connected to the deceleration mechanism.

[0015] Preferably, a bearing is provided in the accommodating cavity, and the main shaft is rotatably connected to the main housing through the bearing.

[0016] Preferably, the bearing includes a cylindrical roller bearing and / or a tapered roller bearing.

[0017] Preferably, the shell assembly further includes a lower end cover, the main shell body is located between the upper end cover and the lower end cover, the lower end cover is fixedly connected to the main shell body, the air cavity and the air transmission hole are both opened in the lower end cover, and the main shaft passes through the accommodating cavity and the air cavity in sequence from its first end to the second end and extends out of the lower end cover.

[0018] Preferably, an oil seal is provided between the main shell and the lower end cover.

[0019] Preferably, along the axial direction of the main shaft, two groups of sealing rings are provided between the main shaft and the lower end cover, the number of the sealing rings in each group is set to at least one, and the air cavity is located between the two groups of sealing rings.

[0020] Preferably, a lifting ring is provided on the shell assembly.

[0021] Beneficial effects:

[0022] The present invention provides a rotary reducer for a down-the-hole drill. A main shaft has a first air passage extending axially through the main shaft to its second end, and a second air passage connected to the first air passage is formed on the sidewall of the main shaft. The first and second air passages together form a gas passage for high-pressure gas. A housing assembly has a gas delivery hole and an inner cavity connected to the gas delivery hole. The second air passage is disposed within the air cavity, allowing external high-pressure gas to enter the inner cavity through the gas delivery hole. From the inner cavity, the second air passage then flows sequentially through the second air passage and the first air passage, ultimately reaching the impactor. This arrangement of air passages eliminates the need for a completely hollow main shaft, effectively improving the main shaft's strength while maintaining the same material diameter. While maintaining the main shaft's strength, it eliminates the need for thickening the main shaft and avoids congestion with the reduction mechanism within the rotary reducer. Furthermore, this arrangement effectively reduces the overall length of the air passages, shortening the high-pressure gas delivery distance and reducing the likelihood of leaks and delayed gas supply during gas delivery. This ensures reliable and efficient delivery of high-pressure gas and the reliability and stability of the high-pressure gas response to the impactor. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic structural diagram of a rotary reducer for a down-the-hole drill provided by the present invention;

[0024] Figure 2 This is a cross-sectional schematic diagram of a rotary reducer for a down-the-hole drill provided by the present invention;

[0025] Figure 3 It is a schematic structural diagram of the speed reduction mechanism provided by the utility model.

[0026] In the picture:

[0027] 1. Shell assembly; 11. Upper end cover; 12. Main shell; 121. Accommodation cavity; 13. Lower end cover; 131. Air cavity; 132. Air delivery hole; 14. Bearing; 15. Oil seal; 16. Sealing ring; 17. Lifting ring;

[0028] 2. Speed ​​reduction mechanism; 21. Primary planetary gear set; 211. Primary sun gear; 212. Primary planet carrier; 213. Primary planet gear; 214. Primary ring gear; 22. Secondary planetary gear set; 221. Secondary sun gear; 222. Secondary planet carrier; 223. Secondary planet gear; 224. Secondary ring gear;

[0029] 3. Main axis; 31. First airway; 32. Second airway. DETAILED DESCRIPTION

[0030] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0031] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0032] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0033] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0034] This embodiment provides a rotary reducer for a down-the-hole drill. Figures 1 to 3 As shown, the rotary reducer for a down-the-hole drill includes a housing assembly 1, a reduction mechanism 2 and a main shaft 3. The reduction mechanism 2 is arranged in the housing assembly 1, and the main shaft 3 is rotatably connected to the housing assembly 1. The first end of the main shaft 3 is connected to the reduction mechanism 2, and the second end of the main shaft 3 extends out of the housing assembly 1. The main shaft 3 is provided with a first air channel 31 along its own axial direction, which passes through to its second end. The side wall of the main shaft 3 located in the housing assembly 1 is provided with a second air channel 32 connected to the first air channel 31. The housing assembly 1 is provided with an air cavity 131 and an air supply hole 132 connected to the air cavity 131. The second air channel 32 is connected and arranged in the air cavity 131.

[0035] In this embodiment, the main shaft 3 is provided with a first air channel 31 extending along its own axis to its second end, and the side wall of the main shaft 3 is provided with a second air channel 32 connected to the first air channel 31. The first air channel 31 and the second air channel 32 together form a gas channel for high-pressure gas to pass through. The shell assembly 1 is provided with a gas delivery hole 132 and an inner cavity connected to the gas delivery hole 132. The second air channel 32 is connected to the gas cavity 131, so that external high-pressure gas can enter the inner cavity through the gas delivery hole 132, and then flow through the second air channel 32 and the first air channel 31 in sequence from the inner cavity to finally act on the impactor. The arrangement of the above-mentioned air channels does not require the main shaft 3 to be set as a completely hollow type. When the main shaft 3 has the same material diameter, the strength of the main shaft 3 is effectively improved. Under the premise of ensuring the strength of the main shaft 3, there is no need to thicken the setting, and it also avoids crowding out the space for the reduction mechanism 2 in the rotary reducer. In addition, the above-mentioned airway layout method will effectively reduce the overall length of the airway, effectively shorten the transportation distance of high-pressure gas, reduce the possibility of leakage and delayed supply during gas transportation, ensure the reliable and effective transportation of high-pressure gas, and ensure the reliability and stability of high-pressure gas response to the impactor.

[0036] It is understandable that the first end of the main shaft 3 is Figures 1 to 2 The middle corresponds to the upper end of the main shaft 3, and the second end of the main shaft 3 is Figures 1 to 2 The middle corresponds to the lower end of the main shaft 3.

[0037] In this embodiment, multiple second air passages 32 are provided, and the multiple second air passages 32 are evenly spaced along the circumference of the main shaft 3. After the high-pressure gas enters the air cavity 131, it can flow evenly in multiple directions through the multiple second air passages 32 into the first air passage 31, ensuring reliable and stable high-pressure gas delivery.

[0038] In this embodiment, the reduction mechanism 2 includes a primary planetary gear set 21 and a secondary planetary gear set 22. The primary planetary gear set 21 includes a primary sun gear 211, a primary planet carrier 212, a primary planetary gear 213, and a primary ring gear 214. The primary planetary gear 213 is rotatably mounted on the primary planet carrier 212. The primary sun gear 211 is rotatably connected to the housing assembly 1. The primary ring gear 214 is fixed within the housing assembly 1. The primary planetary gear 213 is meshed with the primary ring gear 214 and the primary sun gear 211, respectively. The secondary planetary gear set 22 includes a secondary sun gear 221, a secondary planet carrier 222, a secondary planetary gear 223 and a secondary ring gear 224. The secondary planetary gear 223 is rotatably arranged on the secondary planet carrier 222. The secondary sun gear 221 is fixedly connected to the primary planet carrier 212. The secondary ring gear 224 is fixed in the housing assembly 1. The secondary planetary gear 223 is respectively meshed with the secondary ring gear 224 and the secondary sun gear 221. The secondary planet carrier 222 is fixedly connected to the main shaft 3.

[0039] Some existing rotary reducers used in down-the-hole drills are mostly parallel-axis rotary reducers. Parallel-axis rotary reducers have a relatively small reduction ratio and use a large-displacement cycloidal motor as the drive element, which limits the speed range and torque output. Furthermore, the gear arrangement of parallel-axis rotary reducers subjects the drive shaft to radial forces during transmission, which can affect the service life of the drive shaft and bearings 14. In this embodiment, the reduction mechanism 2 includes a primary planetary gear set 21 and a secondary planetary gear set 22. The high-ratio structure of the planetary gear set allows for a more compact design and, under the same operating conditions, a smaller size, requiring less material and resulting in lower costs. This makes operation easier, and the low-torque and small-displacement input motor facilitates fine-tuning of the output, allowing for more adaptive adjustment to the torque and speed requirements of different operating conditions. In terms of performance, the planetary gear set layout eliminates the radial forces generated by parallel-axis gear transmission. Neither the drive shaft nor the bearings 14 are subjected to radial forces during transmission, resulting in improved mechanical properties and a certain degree of extension in the service life of the shaft and bearings 14. Functionally, the reduction mechanism 2 uses a planetary gear set to cover a wider torque range, and a rotary reducer can be used for more caliber rock drilling conditions.

[0040] This embodiment is not limited to this, and the speed reduction mechanism 2 can also be configured as a multi-stage planetary reduction gear set with more than two stages, which is not further limited here.

[0041] In this embodiment, the housing assembly 1 includes an upper end cover 11 and a main housing body 12. The upper end cover 11 is fixedly connected to the main housing body 12. The upper end cover 11 and the main housing body 12 together enclose a receiving chamber 121. The reduction mechanism 2 is disposed within the receiving chamber 121. The first end of the main shaft 3 extends into the receiving chamber 121 and is connected to the reduction mechanism 2. Specifically, when the reduction mechanism 2 is configured to include a primary planetary gear set 21 and a secondary planetary gear set 22, both the primary planetary gear set 21 and the secondary planetary gear set 22 are disposed within the receiving chamber 121, and both the primary ring gear 214 and the secondary ring gear 224 are fixedly mounted to the side walls of the receiving chamber 121.

[0042] In this embodiment, a bearing 14 is disposed in the accommodating cavity 121 , and the main shaft 3 is rotatably connected to the main housing 12 via the bearing 14 . Specifically, the outer ring of the bearing 14 is fixed in the accommodating cavity 121 , and the inner ring of the bearing 14 is fixedly sleeved on the main shaft 3 .

[0043] Optionally, the bearing 14 includes a cylindrical roller bearing and / or a tapered roller bearing. In this embodiment, one cylindrical roller bearing and two tapered roller bearings are provided.

[0044] In this embodiment, the housing assembly 1 further includes a lower end cover 13. The main housing 12 is positioned between the upper end cover 11 and the lower end cover 13. The lower end cover 13 is fixedly connected to the main housing 12. The air cavity 131 and the air delivery hole 132 are both defined in the lower end cover 13. The main shaft 3 extends from its first end to its second end through the accommodating cavity 121 and the air cavity 131, extending out of the lower end cover 13. Specifically, the upper end cover 11 is secured to the main housing 12 via bolts, and the lower end cover 13 is secured to the main housing 12 via bolts.

[0045] Furthermore, an oil seal 15 is disposed between the main housing 12 and the lower end cover 13. Specifically, since the reduction mechanism 2 is disposed within the accommodating chamber 121 above the air cavity 131, lubricating oil is required. The oil seal 15 effectively ensures the sealing of the accommodating chamber 121, preventing the lubricating oil within the accommodating chamber 121 from seeping into the air cavity 131. The specific structure of the oil seal 15 is conventional and will not be elaborated upon here.

[0046] Furthermore, along the axial direction of the main shaft 3, two sets of sealing rings 16 are provided between the main shaft 3 and the lower end cover 13. Each set of sealing rings 16 is provided with at least one, and the air cavity 131 is located between the two sets of sealing rings 16. The provision of two sets of sealing rings 16 can provide reliable and effective sealing for the air cavity 131 on opposite sides along the axial direction of the main shaft 3, thereby preventing leakage of the high-pressure gas in the air cavity 131.

[0047] Optionally, the sealing member is configured as a Gly ring.

[0048] In this embodiment, a lifting ring 17 is provided on the housing assembly 1. The provision of the lifting ring 17 enables the entire slewing reducer to be lifted.

[0049] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A rotary reducer for a down-the-hole drill, characterized in that: include: Housing assembly (1); A speed reduction mechanism (2) is provided in the housing assembly (1); A main shaft (3), the main shaft (3) is rotatably connected to the housing assembly (1), the first end of the main shaft (3) is connected to the speed reduction mechanism (2), the second end of the main shaft (3) extends outside the housing assembly (1), the main shaft (3) is provided with a first air passage (31) extending to the second end thereof along its own axial direction, the side wall of the main shaft (3) located in the housing assembly (1) is provided with a second air passage (32) connected to the first air passage (31), the housing assembly (1) is provided with an air cavity (131) and an air delivery hole (132) connected to the air cavity (131), and the second air passage (32) is connected and arranged in the air cavity (131).

2. The rotary reducer for a down-the-hole drill according to claim 1, characterized in that: A plurality of the second air channels (32) are provided, and the plurality of the second air channels (32) are evenly spaced and distributed along the circumference of the main shaft (3).

3. The rotary reducer for a down-the-hole drill according to claim 1, characterized in that: The speed reduction mechanism (2) includes a primary planetary gear set (21) and a secondary planetary gear set (22); wherein, The first-stage planetary gear set (21) comprises a first-stage sun gear (211), a first-stage planet carrier (212), a first-stage planet gear (213) and a first-stage ring gear (214); the first-stage planet gear (213) is rotatably mounted on the first-stage planet carrier (212); the first-stage sun gear (211) is rotatably connected to the housing assembly (1); the first-stage ring gear (214) is fixed in the housing assembly (1); and the first-stage planet gear (213) is meshedly connected to the first-stage ring gear (214) and the first-stage sun gear (211); The secondary planetary gear set (22) includes a secondary sun gear (221), a secondary planet carrier (222), a secondary planet gear (223) and a secondary ring gear (224); the secondary planet gear (223) is rotatably arranged on the secondary planet carrier (222); the secondary sun gear (221) is fixedly connected to the primary planet carrier (212); the secondary ring gear (224) is fixed in the housing assembly (1); the secondary planet gear (223) is meshed with the secondary ring gear (224) and the secondary sun gear (221) respectively; and the secondary planet carrier (222) is fixedly connected to the main shaft (3).

4. The rotary reducer for a down-the-hole drill according to claim 1, characterized in that: The housing assembly (1) comprises an upper end cover (11) and a main housing body (12); the upper end cover (11) is fixedly connected to the main housing body (12); the upper end cover (11) and the main housing body (12) together enclose a receiving cavity (121); the speed reduction mechanism (2) is arranged in the receiving cavity (121); and the first end of the main shaft (3) extends into the receiving cavity (121) and is connected to the speed reduction mechanism (2).

5. The rotary reducer for a down-the-hole drill according to claim 4, characterized in that: A bearing (14) is provided in the accommodating cavity (121), and the main shaft (3) is rotatably connected to the main housing (12) via the bearing (14).

6. The rotary reducer for a down-the-hole drill according to claim 5, characterized in that: The bearing (14) comprises a cylindrical roller bearing and / or a tapered roller bearing.

7. The rotary reducer for a down-the-hole drill according to claim 4, characterized in that: The housing assembly (1) further comprises a lower end cover (13), the main housing body (12) is located between the upper end cover (11) and the lower end cover (13), the lower end cover (13) is fixedly connected to the main housing body (12), the air cavity (131) and the air delivery hole (132) are both provided in the lower end cover (13), and the main shaft (3) is sequentially provided with the accommodating cavity (121) and the air cavity (131) from its first end to its second end and extends out of the lower end cover (13).

8. The rotary reducer for a down-the-hole drill according to claim 7, characterized in that: An oil seal (15) is provided between the main housing (12) and the lower end cover (13).

9. The rotary reducer for a down-the-hole drill according to claim 7, characterized in that: Along the axial direction of the main shaft (3), two groups of sealing rings (16) are provided between the main shaft (3) and the lower end cover (13), the number of the sealing rings (16) in each group is set to at least one, and the air cavity (131) is located between the two groups of sealing rings (16).

10. The rotary reducer for a down-the-hole drill according to claim 1, characterized in that: A lifting ring (17) is provided on the housing assembly (1).

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