Power head shock absorber and rotary drilling rig

Abstract

A power head shock absorber includes a shock absorber bracket and a drive sleeve, wherein the shock absorber bracket is sleeved on the drive sleeve. The shock absorber bracket includes a cylindrical bracket body and a plurality of first guide parts arranged on the bracket body, and the bracket body is provided with a plurality of mounting openings spaced circumferentially, and each mounting opening is provided with a first guide part, and the first guide part is provided with a guide groove opening toward the drive sleeve, and the extension direction of the guide groove is the same as the axial direction of the bracket body. The drive sleeve includes a base and a drive sleeve connected to the base, and the upper end of the drive sleeve away from the base is provided with a plurality of second guide parts, each second guide part is clamped in a guide groove and can slide up and down along the guide groove. The guide structure of the power head shock absorber of the present invention has high strength, can protect the guide rod and spring, etc., and reduce the impact under the condition of eccentric load, and does not require the use of bolts for assembly, so there will be no loosening of bolts, and the device is strong and durable. The present invention also relates to a rotary drilling rig.

Description

Technical Field

[0001] The present invention relates to the technical field of engineering machinery, in particular to a power head shock absorber and a rotary drilling rig having the power head shock absorber. Background Art

[0002] A rotary drilling rig is a large, modern, electromechanical, and hydraulically integrated machine used for drilling in pile foundation projects. It boasts a high cycle life. A rotary drilling rig typically consists of a mainframe, a mast mounted on the mainframe, a drill pipe, a power head, and drilling tools. The mast is pivotally connected to the mainframe at its base. The power head is mounted on the mast and connected to the mainframe via a pressurized cylinder or a pressurized winch wire rope. The drill pipe is connected to the power head via a keyed sleeve, allowing it to rotate. The drilling tool is mounted at the bottom of the drill pipe and is driven by the drill pipe to perform drilling operations. The power head is also equipped with a shock absorber to cushion the impact of the drill pipe.

[0003] During the construction of a rotary drilling rig, the drill rod will repeatedly impact up and down on the shock absorber, and the shock absorber will always be in a state of repeated compression. Once an impact load or an offset load occurs and acts on the shock absorber bracket, the shock absorber bracket will transfer an offset load to the spring and guide rod of the shock absorber, which will cause the spring to be damaged and the guide rod to break. In order to protect the overall structure of the shock absorber, the existing technology generally designs a guide mechanism. When the shock absorber bracket is subjected to external force, it is ensured that the shock absorber bracket can move along the guide mechanism to protect the spring, guide rod and other structures. However, due to the harsh construction environment of the rotary drilling rig, the guide mechanism of the shock absorber is severely worn. In addition, due to the small space between the inner side of the shock absorber bracket and the outer side of the drive sleeve, the design space left for designing the guide mechanism is small, and the small guide bar has poor guiding performance and low structural strength.

[0004] For example, a Chinese patent application number CN201621085651.6 discloses a shock-absorbing mechanism for a rotary drilling rig and its power head, which is mainly assembled on the pressure plate cylinder 17 through a limiting partition 12, and the limiting block 10 is assembled on the outer wall of the base cylinder 34. First, due to actual processing problems, there will be certain difficulties in processing threaded holes on the circumference, which will affect the assembly results. Secondly, the construction conditions of the rotary drilling rig are poor, and the bolt assembly structure will cause the bolts to loosen over time. In addition, since the design gap between the pressure plate cylinder 17 and the base cylinder 34 is relatively small, this structure fails to increase the thickness of the limiting partition 12 and the limiting block 10. Finally, the shock-absorbing mechanism of the power head mentioned above uses a nitrogen spring 2 structure. The construction conditions of the rotary drilling rig are poor. During the construction of the drill rod, it is often placed on the pressure plate cylinder 17, and there will be a large impact on the pressure plate cylinder 17, which will cause the rod to be hit and dragged. The nitrogen spring 2 is a structure that cannot withstand rapid impact. When a large impact such as a rod hitting the pressure plate cylinder 17 occurs, the spring is compressed and the pressure plate cylinder 17 will directly act on the nitrogen spring 2. The nitrogen spring 2 cannot withstand rapid impact. According to market feedback, the nitrogen spring 2 may not be able to rebound and the failure rate is high. Summary of the Invention

[0005] The purpose of the present invention is to provide a power head shock absorber, which has a high guide structure strength, can protect the guide rod and spring, etc. to reduce the impact under unbalanced load conditions, and does not require the use of bolts for assembly, will not cause bolt loosening, and is strong and durable.

[0006] The present invention solves the technical problem by adopting the following technical solutions.

[0007] A power head shock absorber includes a shock absorber bracket and a drive sleeve, wherein the shock absorber bracket is sleeved on the drive sleeve. The shock absorber bracket includes a cylindrical bracket body and multiple first guide portions provided on the bracket body. The bracket body is provided with multiple mounting openings spaced circumferentially, each of which is provided with a first guide portion. The first guide portion is provided with a guide groove opening toward the drive sleeve, and the guide groove extends in the same direction as the axial direction of the bracket body. The drive sleeve includes a base and a drive sleeve connected to the base. The upper end of the drive sleeve, away from the base, is provided with multiple second guide portions. Each second guide portion is clamped in a guide groove and can slide up and down along the guide groove.

[0008] Furthermore, the first guide portion is welded to the mounting opening of the shock absorber bracket; and the second guide portion is welded to the driving sleeve.

[0009] Furthermore, the first guide portion includes a main body extending along the axial direction of the bracket body and two limiting portions located on both sides of the main body; in the radial direction of the bracket body, the thickness of the limiting portion is greater than the thickness of the main body, and the two limiting portions both protrude toward the driving sleeve so that a guide groove is formed between the main body and the two limiting portions.

[0010] Furthermore, a reinforcing rib is provided on the back side of the first guide portion away from the second guide portion.

[0011] Furthermore, the shock absorber bracket also includes a first flange and a second flange respectively located at both ends of the axial direction, and multiple first reinforcement plates are provided between the first flange and the second flange; a third flange is provided on the outer wall of the drive sleeve, and multiple second reinforcement plates are provided between the third flange and the base.

[0012] Furthermore, a plurality of springs and a plurality of guide rods are provided between the second flange of the shock absorber bracket and the third flange of the driving sleeve, and a spring is provided on the outer sleeve of each guide rod.

[0013] Furthermore, a plurality of limiting sleeves are provided on the surface of the second flange on the side close to the third flange, the upper end of each guide rod is sleeved in a limiting sleeve, and a step is also provided on the guide rod.

[0014] Furthermore, a plurality of hydraulic buffers are provided on a side of the third flange close to the second flange, and a plurality of limit blocks corresponding to the positions of the plurality of hydraulic buffers are provided on a side of the second flange close to the third flange.

[0015] Furthermore, the first guide portion is composed of two limiting portions, the two limiting portions are respectively fixed on both sides of the installation opening, and the space between the two limiting portions forms a guide groove.

[0016] The present invention also provides a rotary drilling rig, comprising the power head shock absorber.

[0017] The power head shock absorber of the present invention has a first guide portion arranged on the mounting port of the shock absorber bracket, and the thickness of the first guide portion is not limited by the spacing distance between the bracket body of the shock absorber bracket and the drive sleeve. The thickness and width of the first guide portion are relatively large, and the thickness and width of the guide groove are correspondingly relatively large, and the strength of the first guide portion is relatively high; since the guide groove is wider and deeper, the second guide portion is also correspondingly made wider and thicker, and the strength of the second guide portion is also correspondingly improved. During construction, when the power head shock absorber is subjected to the impact vibration of the drill rod, it can ensure that the shock absorber bracket is inserted into the drive sleeve according to the guide structure (the first guide portion and the second guide portion), protecting the guide rod and the spring, etc., and reducing the impact under unbalanced load conditions; and no bolts are required for assembly, and the bolts will not loosen, and the device is strong and durable.

[0018] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented in accordance with the contents of the specification. In addition, in order to make the other purposes, features and advantages of the above-mentioned power head shock absorber and rotary drilling rig of the present invention more obvious and easy to understand, the following specifically cites preferred embodiments and describes them in detail with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of a rotary drilling rig according to a first embodiment of the present invention.

[0020] Figure 2 It is a structural schematic diagram of the power head assembly of the first embodiment of the present invention.

[0021] Figure 3 It is a front view of the power head shock absorber of the first embodiment of the present invention.

[0022] Figure 4 1 is a top view of the power head shock absorber according to the first embodiment of the present invention.

[0023] Figure 5 yes Figure 4 Schematic diagram of the enlarged structure of area A in the middle.

[0024] Figure 6 It is a front view of the shock absorber bracket of the power head shock absorber according to the first embodiment of the present invention.

[0025] Figure 7 1 is a top view of the shock absorber bracket of the power head shock absorber according to the first embodiment of the present invention.

[0026] Figure 8 yes Figure 7 Schematic diagram of the enlarged structure of area B in the middle.

[0027] Figure 9 It is a front view of the driving sleeve of the power head shock absorber according to the first embodiment of the present invention.

[0028] Figure 10 1 is a top view of the driving sleeve of the power head shock absorber according to the first embodiment of the present invention.

[0029] Figure 11 Figure 10 Schematic diagram of the enlarged structure of the C area in the middle.

[0030] Figure 12 1 is a schematic structural diagram of a guide rod and a spring of a power head shock absorber according to a first embodiment of the present invention.

[0031] Figure 13 1 is a top view of a power head shock absorber according to a second embodiment of the present invention.

[0032] Figure 14 yes Figure 13 Schematic diagram of the enlarged structure of the D area in the middle. DETAILED DESCRIPTION

[0033] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose of the invention, the specific implementation, structure, features and effects of the power head shock absorber and rotary drilling rig proposed by the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments:

[0034] The aforementioned and other technical contents, features, and effects of the present invention will be clearly presented in the following detailed description of the preferred embodiments with reference to the accompanying drawings. Through the description of the specific embodiments, a deeper and more detailed understanding of the technical means and effects adopted by the present invention to achieve the intended objectives can be obtained. However, the accompanying drawings are provided for reference and illustration purposes only and are not intended to limit the present invention.

[0035] [First embodiment]

[0036] like Figure 1 As shown, the rotary drilling rig includes a main machine and a mast 1, a drill rod 2, a power head assembly 3 and a drilling tool 4 arranged on the main machine. Among them, the bottom of the mast 1 is pivotally connected to the main machine, so that the mast 1 can be opened to a roughly vertical state during the construction of the rotary drilling rig, or folded onto the main machine when it is stopped. The power head assembly 3 is arranged on the mast and is connected to the main machine through a pressurized oil cylinder or a pressurized winch wire rope. The drill rod 2 is connected to the power head assembly 3 so as to rotate under the drive of the power head assembly 3. The drilling tool 4 is installed at the bottom of the drill rod 2 and can perform drilling operations under the drive of the drill rod 2. The main machine is also provided with a cab, a main winch device, etc., which are well known to those skilled in the art and will not be described here.

[0037] like Figure 2 As shown, the power head assembly 3 includes a power head shock absorber 31, a transmission housing 32, a carriage 33, and a pressure plate (not shown). The power head shock absorber 31 is connected to the transmission housing 32 via a first bolt 3281, and the power head assembly 3 is connected to the mast 1 via the carriage 33. The power head shock absorber 31 is primarily used to cushion the vibrations and shocks generated by the drill pipe 2 during normal drilling and to protect the equipment in the event of an abnormality. The structures of the transmission housing 32, carriage 33, and pressure plate are well known to those skilled in the art and will not be described in detail here.

[0038] Please also refer to Figures 3 to 5 The power head shock absorber 31 includes a shock absorber bracket 323 and a driving sleeve 324. The shock absorber bracket 323 is sleeved on the driving sleeve 324 and slides up and down along the axial direction of the driving sleeve 324 under the guidance of the guide structure.

[0039] For details, please refer to Figures 6 to 8 The shock absorber bracket 323 includes a cylindrical bracket body 323a and a plurality of first guide portions 3231 provided on the bracket body 323a, wherein the plurality of first guide portions 3231 are arranged at intervals along the circumference of the bracket body 323a.

[0040] In this embodiment, the bracket body 323a of the shock absorber bracket 323 is provided with a plurality of mounting openings 3232 spaced circumferentially therefrom, and each mounting opening 3232 is provided with a first guide portion 3231. The first guide portion 3231 is, for example, welded to the mounting opening 3232 of the shock absorber bracket 323 and integrated with the bracket body 323a, but this is not limiting. In other embodiments, the first guide portion 3231 may be directly mounted on the mounting opening 3232.

[0041] The first guide portion 3231 is provided with a guide groove 3231c that opens toward the inside of the shock absorber bracket 323 (i.e., toward the drive sleeve 324). The guide groove 3231c extends in the same axial direction as the bracket body 323a. Specifically, the first guide portion 3231 includes a main body 3231a extending along the axial direction of the bracket body 323a and two stoppers 3231b located on either side of the main body 3231a. In the radial direction of the bracket body 323a, the stoppers 3231b are thicker than the main body 3231a. Both stoppers 3231b protrude toward the drive sleeve 324, forming the guide groove 3231c between the main body 3231a and the two stoppers 3231b.

[0042] For example, a thicker arc-shaped plate may be directly welded to the mounting opening 3232 , and then the guide groove 3231 c may be formed on the arc-shaped plate.

[0043] The inner wall of the bracket body 323a of the shock absorber bracket 323 is located outside the drive sleeve 324 and spaced a certain distance apart. The first guide portion 3231 is disposed on the mounting opening 3232 of the shock absorber bracket 323. The thickness of the first guide portion 3231 is not limited by the spacing between the bracket body 323a of the shock absorber bracket 323 and the drive sleeve 324. The first guide portion 3231 has a relatively large thickness and width, and the guide groove 3231c also has a correspondingly large thickness and width, thus providing a high strength of the first guide portion 3231. Furthermore, the first guide portion 3231 is welded to the shock absorber bracket 323 to form an integrated structure. The weld surfaces and weld angles on both sides of the first guide portion 3231 are relatively large, facilitating welding.

[0044] Please also refer to Figures 9 to 11 The driving sleeve 324 includes a base 324a and a driving sleeve 324b connected to the base 324a. The upper end of the driving sleeve 324b away from the base 324a is provided with multiple second guide parts 3241. Each second guide part 3241 is clamped in a guide groove 3231c and can slide up and down along the guide groove 3231c.

[0045] In this embodiment, the second guide portion 3241 is welded to the outer wall of the driving sleeve 324b, but this is not limited to this. In other embodiments, a groove can be processed on the outside of the driving sleeve 324, and the second guide portion 3241 can be made into an assembled structure and assembled into the groove.

[0046] Because the guide groove 3231c is wider and deeper, the second guide portion 3241 is also made wider and thicker, which increases the strength of the second guide portion 3241. Furthermore, the first guide portion 3231 and the second guide portion 3241 are welded and processed, which has a small clearance and good guiding performance, thus avoiding the phenomenon of jamming during relative movement.

[0047] Furthermore, in order to avoid stress concentration caused by weld concentration on the first guide portion 3231 , a reinforcing rib 3233 is provided on the back side of the first guide portion 3231 away from the second guide portion 3241 .

[0048] The shock absorber bracket 323 further includes a first flange 323 b and a second flange 323 c respectively located at two ends in the axial direction, and a plurality of first reinforcing plates 323 d are provided between the first flange 323 b and the second flange 323 c.

[0049] A third flange 324 c is provided on the outer side wall of the driving sleeve 324 b of the driving sleeve 324 , and a plurality of second reinforcing plates 324 d are provided between the third flange 324 c and the base 324 a .

[0050] Furthermore, if Figure 3 and Figure 12 As shown, a plurality of springs 325 and a plurality of guide rods 326 are provided between the second flange 323c of the shock absorber bracket 323 and the third flange 324c of the drive sleeve 324. Each guide rod 326 is provided with a spring 325. The shock absorber bracket 323 moves up and down along the axial direction of the guide rod 326.

[0051] Specifically, one end of the guide rod 326 is fixed to the third flange 324c via a first fixing member 329, and the other end of the guide rod 326 is fixed to the second flange 323c via a second fixing member 330. The first fixing member 329 and the second fixing member 330 are, for example, nuts.

[0052] In this embodiment, a plurality of limit sleeves 3234 are provided on the surface of the second flange 323c close to the third flange 324c, and the upper end of each guide rod 326 is sleeved in a limit sleeve 3234. The guide rod 326 is also provided with a step 3261. When the shock absorber bracket 323 moves downward to a certain distance, the step 3261 of the guide rod 326 will contact the limit sleeve 3234 to form a limit.

[0053] Furthermore, multiple hydraulic buffers 327 are provided on the side of the third flange 324c near the second flange 323c. Multiple stoppers 3235 are provided on the side of the second flange 323c near the third flange 324c, corresponding to the positions of the multiple hydraulic buffers 327. Each hydraulic buffer 327 corresponds to a stopper 3235. When the shock absorber bracket 323 moves downward a certain distance, the hydraulic buffers 327 come into contact with the stopper 3235, forming a secondary limit. The hydraulic buffers 327 are fixedly connected to the drive sleeve 324 using, for example, multiple second bolts 3282.

[0054] During construction, the drill rod 2 repeatedly impacts the power head shock absorber 31, causing the shock absorber bracket 323 to reciprocate up and down, potentially causing rod damage. The hydraulic buffer 327 is a structure designed to withstand large impacts, making it more resilient to damage to the power head shock absorber 31 caused by rod damage. Furthermore, the hydraulic buffer 327 is connected to the drive sleeve 324 using multiple bolts, making it more stable.

[0055] [Second embodiment]

[0056] Please also refer to Figure 13 and Figure 14 The power head shock absorber 31 of this embodiment is roughly the same as the power head shock absorber 31 of the first embodiment, except that the first guide portion 3231 is only provided with two limiting portions 3231b, and the two limiting portions 3231b are respectively fixed on both sides of the mounting port 3232, and each limiting portion 3231b and the bracket body 323a of the shock absorber bracket 323 connected thereto have a roughly "T"-shaped cross-section, and the space between the two limiting portions 3231b forms a guide groove 3231c.

[0057] For other structures of this embodiment, please refer to the first embodiment mentioned above and will not be described again here.

[0058] The power head shock absorber of the present invention has the following beneficial effects: the power head shock absorber includes a shock absorber bracket and a drive sleeve, wherein the shock absorber bracket is mounted on the drive sleeve. The shock absorber bracket includes a cylindrical bracket body and a plurality of first guide portions disposed on the bracket body. The bracket body is provided with a plurality of mounting openings spaced circumferentially, each mounting opening being provided with a first guide portion. The first guide portion is provided with a guide groove opening toward the drive sleeve, and the guide groove extends in the same direction as the axial direction of the bracket body. The drive sleeve includes a base and a drive sleeve connected to the base. The upper end of the drive sleeve, away from the base, is provided with a plurality of second guide portions. Each second guide portion is mounted within a guide groove and can slide up and down along the guide groove. The inner wall of the bracket body of the shock absorber bracket is located on the outside of the drive sleeve and is spaced a certain distance apart. The first guide portion of the power head shock absorber of the present invention is arranged on the mounting opening of the shock absorber bracket. The thickness of the first guide portion is not limited by the spacing distance between the bracket body of the shock absorber bracket and the drive sleeve. The thickness and width of the first guide portion are relatively large, and the thickness and width of the guide groove are also correspondingly relatively large, and the strength of the first guide portion is relatively high. Since the guide groove is wider and deeper, the second guide portion is also made wider and thicker accordingly, and the strength of the second guide portion is also correspondingly improved. During the construction process, when the power head shock absorber is subjected to the impact vibration of the drill rod, it can ensure that the shock absorber bracket is inserted into the drive sleeve according to the guide structure (the first guide portion and the second guide portion), protecting the guide rod and spring and other parts to reduce the impact under the condition of partial load. Moreover, there is no need to use bolts for assembly, and the bolts will not loosen, making it strong and durable. Furthermore, the first guide portion and the second guide portion are processed after welding, with a small matching clearance and good guiding performance, thereby avoiding the phenomenon of jamming during relative movement.

[0059] The power head shock absorber and rotary drilling rig provided by the present invention are introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea; at the same time, for general technical personnel in this field, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A power head shock absorber, comprising a shock absorber bracket (323) and a drive sleeve (324), wherein the shock absorber bracket (323) is sleeved on the drive sleeve (324); characterized in that: The shock absorber bracket (323) includes a cylindrical bracket body (323a) and a plurality of first guide portions (3231) provided on the bracket body (323a). The bracket body (323a) is provided with a plurality of mounting openings (3232) passing through the inner and outer sides of the bracket body (323a) at intervals in the circumferential direction. Each mounting opening (3232) is provided with a first guide portion (3231). The first guide portion (3231) is provided with a guide groove (3231c) opening toward the drive sleeve (324). ), the extension direction of the guide groove (3231c) is the same as the axial direction of the bracket body (323a); the driving sleeve (324) comprises a base (324a) and a driving sleeve (324b) connected to the base (324a), and the upper end of the driving sleeve (324b) away from the base (324a) is provided with a plurality of second guide portions (3241), each of the second guide portions (3241) is clamped in one of the guide grooves (3231c) and can slide up and down along the guide groove (3231c).

2. The power head shock absorber according to claim 1, characterized in that: The first guide portion (3231) is welded to the mounting opening (3232) of the shock absorber bracket (323); and the second guide portion (3241) is welded to the drive sleeve (324b).

3. The power head shock absorber according to claim 1, characterized in that: The first guide portion (3231) includes a main body portion (3231a) extending along the axial direction of the bracket body (323a) and two limiting portions (3231b) located on both sides of the main body portion (3231a); in the radial direction along the bracket body (323a), the thickness of the limiting portion (3231b) is greater than the thickness of the main body portion (3231a), and the two limiting portions (3231b) both protrude toward the driving sleeve (324b) so that the guide groove (3231c) is formed between the main body portion (3231a) and the two limiting portions (3231b).

4. The power head shock absorber according to claim 1, characterized in that: A reinforcing rib (3233) is further provided on the back side of the first guide portion (3231) away from the second guide portion (3241).

5. The power head shock absorber according to claim 1, characterized in that: The shock absorber bracket (323) further includes a first flange (323b) and a second flange (323c) respectively located at both ends in the axial direction, and a plurality of first reinforcing plates (323d) are provided between the first flange (323b) and the second flange (323c); a third flange (324c) is provided on the outer side wall of the driving sleeve (324b), and a plurality of second reinforcing plates (324d) are provided between the third flange (324c) and the base (324a).

6. The power head shock absorber according to claim 5, characterized in that: A plurality of springs (325) and a plurality of guide rods (326) are further provided between the second flange (323c) of the shock absorber bracket (323) and the third flange (324c) of the drive sleeve (324), and one of the springs (325) is provided on the outer surface of each guide rod (326).

7. The power head shock absorber according to claim 6, characterized in that: A plurality of limiting sleeves (3234) are provided on the surface of the second flange (323c) on the side close to the third flange (324c), and the upper end of each guide rod (326) is sleeved in one of the limiting sleeves (3234). The guide rod (326) is also provided with a step (3261).

8. The power head shock absorber according to claim 6, characterized in that: A plurality of hydraulic buffers (327) are further provided on the side of the third flange (324c) close to the second flange (323c), and a plurality of limit blocks (3235) corresponding to the positions of the plurality of hydraulic buffers (327) are provided on the side of the second flange (323c) close to the third flange (324c).

9. The power head shock absorber according to claim 1, characterized in that: The first guide portion (3231) is composed of two limiting portions (3231b), the two limiting portions (3231b) are respectively fixed on both sides of the installation opening (3232), and the space between the two limiting portions (3231b) forms the guide groove (3231c).

10. A rotary drilling rig, characterized in that: It comprises a power head shock absorber (31) as claimed in any one of claims 1 to 9.

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