Power head guiding and buffering device and rotary drilling rig

Abstract

The utility model discloses a power head guiding and buffering device and a rotary drilling rig, and the device comprises a pressure plate, a first annular table is fixedly arranged on the outer side of the pressure plate; the inner sleeve is inserted into the pressure plate in a sliding manner, a second ring table is fixedly arranged on the outer side of the inner sleeve, and the second ring table is positioned below the first ring table; the spring buffer assembly is arranged between the first ring table and the second ring table; the guiding structure comprises a guiding column and a guiding sleeve, the guiding column is fixedly arranged on the outer side of the pressing disc, the guiding sleeve is fixedly arranged on the outer side of the inner sleeve, and the lower end of the guiding column is inserted into the guiding sleeve in a sliding mode; wherein the diameter of the guide column is set to be 50-70 mm, the wall thickness of the guide sleeve is set to be 15-25 mm, and an oil groove is formed in the side wall of the guide column in a concave mode. The guide structure adopts a guide sleeve and guide post matching form, so that the anti-rotation capability of the pressure plate on the power head is improved, the guide post is not easy to damage, and the service life is longer; grease can be injected into the guide sleeve, grease can be stored in the oil groove in the side wall of the guide column, the grease lubricating effect can be improved, and abrasion of the guide structure is effectively reduced.

Description

Technical Field

[0001] This utility model relates to the field of power head buffer technology, and in particular to a power head guide buffer device and a rotary drilling rig. Background Technology

[0002] Rotary drilling rigs are construction machines used for hole-forming operations in pile foundation engineering. They rely on a power head to drive the drill rod, enabling the drill bit to rotate and cut the soil and rock. A winch then lifts the drill bit out of the hole to unload the soil, repeating this cycle until the hole is formed. As a crucial component of the rotary drilling rig, the power head is subjected to significant impact forces during construction. Therefore, it is equipped with a buffer device to cushion the impact force when the drill rod falls. Typically, the buffer device consists of a pressure plate, an inner sleeve, and a buffer structure. The pressure plate and inner sleeve slide together, and the buffer structure is positioned between them. When impacted, the buffer structure stores and absorbs the force. Common buffer structures include spring buffers and hydraulic buffers. Spring buffers usually consist of a compression spring and a guide rod. The two ends of the guide rod are inserted into the pressure plate and the inner sleeve, respectively, and the compression spring is fitted onto the guide rod.

[0003] During the drilling process of a rotary drilling rig, when the pressure plate on the power head is subjected to rotational force, it is easy to break the guide rod of the power head buffer device. In order to eliminate or reduce the transmission of this rotational force to the guide rod, the buffer device is also equipped with an additional guide structure. At present, the common guide structure is: three welded grooves are evenly distributed around the inner side of the pressure plate, and a welded guide strip is fitted inside to form a guide. However, this structure has a fast wear of the guide strip, a short service life, and the guide strip is prone to falling off. Utility Model Content

[0004] The purpose of this invention is to provide a power head guide buffer device and a rotary drilling rig, which can reduce the wear of the guide structure and extend its service life.

[0005] According to a first aspect of the present invention, a power head guiding and buffering device is provided, comprising: a pressure plate with a first annular platform fixedly disposed on its outer side; an inner sleeve slidably inserted into the pressure plate and with a second annular platform fixedly disposed on its outer side, the second annular platform being located below the first annular platform; a spring buffer assembly disposed between the first annular platform and the second annular platform; and a guiding structure comprising a guide post and a guide sleeve, the guide post being fixedly disposed on the outer side of the pressure plate, the guide sleeve being fixedly disposed on the outer side of the inner sleeve, and the lower end of the guide post being slidably inserted into the guide sleeve; wherein the diameter of the guide post is set to 50-70mm, the wall thickness of the guide sleeve is set to 15-25mm, and an oil groove is recessed in the side wall of the guide post.

[0006] According to the power head guide buffer device, the side wall of the guide sleeve is provided with an oil injection hole.

[0007] According to the power head guide buffer device, the first ring platform is provided with a first positioning hole, and the upper end of the guide column has a first positioning part that is adapted to the first positioning hole.

[0008] According to the power head guide buffer device, the outer wall of the inner sleeve is fixed with a mounting platform between the first ring platform and the second ring platform, and the guide sleeve is disposed on the top of the mounting platform.

[0009] According to the power head guide buffer device, a hydraulic buffer is provided on one side of the guide sleeve at the top of the mounting platform.

[0010] According to the power head guide buffer device, the mounting platform has a through hole communicating with the inner cavity of the guide sleeve, and a plug that slides in the guide sleeve inner cavity is provided in the through hole. A hydraulic buffer is provided on the second ring platform below the plug, and a first spring is provided between the top surface of the outer shell of the hydraulic buffer and the bottom surface of the plug.

[0011] According to the power head guide buffer device, the bottom surface of the plug head is recessed with a mounting groove, the top of the piston head of the hydraulic buffer is located in the mounting groove, and there is a gap between the top surface of the piston head and the inner top wall of the mounting groove.

[0012] According to the power head guide buffer device, the spring buffer assembly includes a guide rod and a second spring. The guide rod is inserted into the first ring platform and the second ring platform, and the second spring is sleeved on the guide rod between the first ring platform and the second ring platform.

[0013] According to a second aspect of the present invention, a rotary drilling rig is provided, which includes the aforementioned power head guide buffer device.

[0014] Beneficial effects: The guide structure adopts a combination of guide sleeve and guide post, which improves the anti-rotation capability of the pressure plate on the power head, makes the guide post less prone to damage, and extends its service life; grease can be injected into the guide sleeve, and grease can be stored in the oil groove on the side wall of the guide post, which can increase the lubrication effect of grease and effectively reduce the wear of the guide structure; the diameter of the guide post is set to 50-70mm, and the wall thickness of the guide sleeve is set to 15-25mm, which can ensure its structural strength and avoid deformation.

[0015] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0017] Figure 1 A perspective structural diagram of the first embodiment of the power head guide buffer device;

[0018] Figure 2 A cross-sectional view of the first embodiment of the power head guide buffer device;

[0019] Figure 3 This is a structural diagram of the second embodiment of the power head guide buffer device;

[0020] Figure 4 This is a structural diagram of the third embodiment of the power head guide buffer device;

[0021] Figure 5 This is a partial structural cross-sectional view of the third embodiment of the power head guide buffer device. Detailed Implementation

[0022] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0023] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not 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.

[0024] In the description of this utility model, terms such as greater than, less than, and exceeding are understood to exclude the stated number, while terms such as above, below, and within are understood to include the stated number. The use of terms like "first" and "second" is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the quantity or sequence of the indicated technical features.

[0025] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0026] Reference Figure 1-2A first embodiment of the power head guide buffer device includes a pressure plate 10, an inner sleeve 20, a spring buffer assembly 30, and a guide structure 40. A first annular platform 11 is fixedly disposed on the outer side of the pressure plate 10. The inner sleeve 20 is slidably inserted into the pressure plate 10. A second annular platform 21 is fixedly disposed on the outer side of the inner sleeve 20, and the second annular platform 21 is located below the first annular platform 11. The spring buffer assembly 30 is disposed between the first annular platform 11 and the second annular platform 21. The guide structure 40 includes a guide post 41 and a guide sleeve 42. The guide post 41 is fixedly disposed on the outer side of the pressure plate 10, and the guide sleeve 42 is fixedly disposed on the outer side of the inner sleeve 20. The lower end of the guide post 41 is slidably inserted into the guide sleeve 42. The diameter of the guide post 41 is D, where 50 ≤ D ≤ 70 mm. The wall thickness of the guide sleeve 42 is W, where 15 ≤ W ≤ 25 mm. The side wall of the guide post 41 is recessed with a spiral-shaped oil groove 411.

[0027] In the above scheme, the guide structure 40 adopts a combination of guide sleeve 42 and guide post 41, which improves the anti-rotation capability of the pressure plate 10 on the power head, makes the guide post 41 less prone to damage, and extends its service life. Grease can be injected into the guide sleeve 42, and grease can be stored in the oil groove 411 on the side wall of the guide post 41, which increases the lubrication effect of the grease and effectively reduces the wear of the guide structure 40. The diameter of the guide post 41 is set to 50-70mm, and the wall thickness of the guide sleeve 42 is set to 15-25mm to ensure its structural strength and prevent deformation. The guide sleeve 42 and guide post 41 can be made of 40Cr material to improve their service life.

[0028] In this embodiment, the side wall of the guide sleeve 42 is provided with an oil injection hole 421 so as to inject grease into the guide sleeve 42.

[0029] In this embodiment, the first annular platform 11 has a first positioning hole 12, and the upper end of the guide post 41 has a first positioning part 412 that matches the first positioning hole 12. This structure allows the guide post 41 to be aligned with the first annular platform 11, improving installation accuracy.

[0030] In this embodiment, an installation platform 22 is provided on the outer side wall of the inner sleeve 20 between the first annular platform 11 and the second annular platform 21, and the guide sleeve 42 is fixedly disposed on the top of the installation platform 22. Both the guide sleeve 42 and the guide post 41 can be fixedly installed by welding.

[0031] In this embodiment, the spring buffer assembly 30 includes a guide rod 31 and a second spring 32. The guide rod 31 is inserted into the first ring platform 11 and the second ring platform 21, and the second spring 32 is sleeved on the guide rod 31 between the first ring platform 11 and the second ring platform 21.

[0032] Reference Figure 3In a second embodiment of the power head guide buffer device, compared to the first embodiment, a hydraulic buffer 60 is further provided on the top of the mounting platform 22 on one side of the guide sleeve 42. The hydraulic buffer 60 can also protect the power head to buffer the impact force when the drill pipe falls instantaneously.

[0033] Reference Figure 4-5 In the third embodiment of the power head guide buffer device, compared with the first embodiment, in this embodiment: a through hole 221 communicating with the inner cavity of the guide sleeve 42 is provided on the mounting platform 22, a plug 50 is provided in the through hole 221, the plug 50 slides with the inner cavity of the guide sleeve 42, a hydraulic buffer 60 is provided on the second ring platform 21 below the plug 50, and a first spring 52 is provided between the top surface of the outer shell of the hydraulic buffer 60 and the bottom surface of the plug 50.

[0034] In this embodiment, the guide structure 40 and the hydraulic buffer 60 are arranged vertically, which reduces the lateral space occupied and facilitates their installation. The first spring 52 is pre-compressed during installation, and it can push the plug head 50 upward to ensure that it maintains its position when not pressed by the guide post 41. During buffering, the guide post 41 moves downward to push the plug head 50, and the plug head 50 moves downward to press the piston head of the hydraulic buffer 60, so that the hydraulic buffer 60 can be activated to provide buffering.

[0035] During maintenance, the buffer device is in an inactive state, with the guide post 41 extending its maximum distance from the guide sleeve 42. Maintenance personnel use a grease gun to inject grease into the guide sleeve 42 through the grease injection hole 421, and also coat the surface of the guide post 41 with grease. However, because the guide post 41 will descend and insert into the guide sleeve 42 when the buffer device is operational, the remaining space within the guide sleeve 42 is compressed. If the guide sleeve 42 is filled with grease, a large amount of grease will be squeezed out and wasted. Therefore, when injecting grease, it is not necessary to fill the guide sleeve 42 completely to reduce grease waste.

[0036] In this embodiment, the bottom surface of the plug 50 is recessed with a mounting groove 51, the top of the piston head of the hydraulic buffer 60 is located in the mounting groove 51, and there is a gap between the top surface of the piston head and the inner top wall of the mounting groove 51. With this structure, the mounting groove 51 can accommodate the top of the piston head, avoiding assembly interference.

[0037] This utility model also provides a rotary drilling rig, which has the aforementioned power head guide buffer device.

[0038] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A power head guide buffer device, characterized in that, include: The pressure plate has a first ring platform fixed on its outer side; The inner sleeve is slidably inserted into the pressure plate and a second ring platform is fixed on the outer side, with the second ring platform located below the first ring platform; A spring buffer assembly is disposed between the first ring stage and the second ring stage; The guide structure includes a guide post and a guide sleeve. The guide post is fixed to the outside of the pressure plate, and the guide sleeve is fixed to the outside of the inner sleeve. The lower end of the guide post is slidably inserted into the guide sleeve. The guide post has a diameter of 50-70mm, a guide sleeve wall thickness of 15-25mm, and an oil groove is recessed on the side wall of the guide post.

2. The power head guide buffer device according to claim 1, characterized in that, The guide sleeve has an oil injection hole on its side wall.

3. The power head guide buffer device according to claim 1, characterized in that, The first ring platform has a first positioning hole, and the upper end of the guide post has a first positioning part that is adapted to the first positioning hole.

4. The power head guide buffer device according to claim 1, 2, or 3, characterized in that, The outer wall of the inner sleeve is fixed with a mounting platform between the first ring platform and the second ring platform, and the guide sleeve is disposed on the top of the mounting platform.

5. The power head guide buffer device according to claim 4, characterized in that, A hydraulic buffer is provided on one side of the guide sleeve at the top of the mounting platform.

6. The power head guide buffer device according to claim 4, characterized in that, The mounting platform has a through hole communicating with the inner cavity of the guide sleeve. A plug that slides within the through hole is provided with the inner cavity of the guide sleeve. A hydraulic buffer is provided on the second ring platform below the plug. A first spring is provided between the top surface of the outer shell of the hydraulic buffer and the bottom surface of the plug.

7. The power head guide buffer device according to claim 6, characterized in that, The bottom surface of the plug is recessed with a mounting groove, the top of the piston head of the hydraulic damper is located in the mounting groove, and there is a gap between the top surface of the piston head and the inner top wall of the mounting groove.

8. The power head guide buffer device according to claim 1, characterized in that, The spring buffer assembly includes a guide rod and a second spring. The guide rod is inserted into the first ring platform and the second ring platform, and the second spring is sleeved on the guide rod between the first ring platform and the second ring platform.

9. A rotary drilling rig, characterized in that, Includes the power head guide buffer device as described in any one of claims 1 to 8.

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