Power head drive structure and rotary drilling rig

Abstract

The present invention discloses a power head drive structure and a rotary drilling rig. The power head drive structure includes a shock absorption bracket, a drive sleeve, and a transmission shaft. The shock absorption bracket is slidably connected to the drive sleeve. The transmission shaft is fixedly connected to the drive sleeve through a fastener. A connection key for fixedly connecting the drive sleeve and the transmission shaft is further provided between the drive sleeve and the transmission shaft. In the power head drive structure and the rotary drilling rig of the present invention, since the drive disk and the transmission shaft are connected not only through a fastener but also through a connection key, when subjected to a radial force, the connection key can resist the radial force, and when subjected to an eccentric load, the connection key can resist the eccentric load. Therefore, the strength of the power head drive structure is greatly improved, and the ability of the power head drive structure to resist loads is improved. This can also protect the fastener and prevent it from being sheared under the action of the radial force.

Description

Technical Field

[0001] The present invention relates to the technical field of foundation construction, and particularly to a power head drive structure and a rotary drilling rig. Background Art

[0002] A rotary drilling rig is a construction machine suitable for hole-forming operations in pile foundation projects. Its principle is to drive a drill pipe by a power head to realize the rotation and cutting of the drill tool on the rock and soil, and then use a hoist to lift the drill tool out of the hole to unload the soil, and complete the hole-forming through periodic cyclic operations. The power head is an important component of the rotary drilling rig, which is composed of a power box, a reducer, a carriage, a buffer device, etc.

[0003] As Figure 1 shown, a power head drive structure includes a drive sleeve 11 and a transmission shaft 12. One end of the drive sleeve 11 is provided with a flange 112. After a bolt 13 passes through the flange 112, it is connected to one end of the transmission shaft 12. The flange 112 is connected to the main body of the drive sleeve 11 by welding. In this way, there is a weld bead at the connection between the flange 112 and the main body of the drive sleeve 11. This weld bead is small, with poor strength, and the bolt 13 is close to the main body of the drive sleeve 11, making installation inconvenient, and the installation holes on the flange 112 and the transmission shaft 12 are difficult to machine. Generally speaking, the connection method between the drive sleeve 11 and the transmission shaft 12 has poor strength and poor ability to withstand large impact radial loads.

[0004] As Figure 2 shown, another power head drive structure includes a drive sleeve 11, a transmission shaft 12 and a connecting member 15. The connecting member 15 is connected to the transmission shaft 12 by a bolt 16, and then the drive sleeve 11 is connected to the connecting member 15 by a bolt 17. The bolts 16 and 17 are extremely likely to be sheared under large impact loads. Summary of the Invention

[0005] The object of the present invention is to provide a power head drive structure and a rotary drilling rig with higher strength and capable of withstanding large impact loads.

[0006] A power head drive structure includes a shock-absorbing bracket, a drive sleeve and a transmission shaft. The shock-absorbing bracket is slidably connected to the drive sleeve. The transmission shaft is fixedly connected to the drive sleeve through a fastener. A key for fixedly connecting the drive sleeve and the transmission shaft is further provided between the drive sleeve and the transmission shaft.

[0007] In one embodiment, a first keyway is formed on the inner side of the drive sleeve, a second keyway is formed on the outer side of the transmission shaft, and the connecting key is received in the first keyway and the second keyway; alternatively, the connecting key is fixedly connected to the drive sleeve, a second keyway is formed on the outer side of the transmission shaft, and a part of the connecting key is received in the second keyway; or, the connecting key is fixedly connected to the transmission shaft, a first keyway is formed on the inner side of the drive sleeve, and a part of the connecting key is received in the first keyway.

[0008] In one embodiment, the connecting key is fixed on the end face of the drive sleeve, a second keyway is formed on the end face of the transmission shaft, and the connecting key is engaged with the second keyway; alternatively, the connecting key is fixed on the end face of the transmission shaft, a first keyway is formed on the end face of the drive sleeve, and the connecting key is engaged with the first keyway.

[0009] In one embodiment, a boss protruding towards the inside of the transmission shaft is further provided on the inner side of the transmission shaft, and the fastener is connected to the position of the transmission shaft where the boss is provided.

[0010] In one embodiment, a flange portion is further provided on the outer side of the drive sleeve body of the drive sleeve, the flange portion is provided at one end of the drive sleeve where it is connected to the transmission shaft, a connection hole is further formed at one end of the transmission shaft adjacent to the drive sleeve, mounting holes are formed on the flange portion for the fastener to be inserted, and the fastener passes through the mounting hole and is inserted into the connection hole.

[0011] In one embodiment, the transmission shaft is a hollow cylindrical shape, and one end of the drive sleeve is sleeved inside the transmission shaft.

[0012] In one embodiment, the shock absorption bracket includes a bracket cylinder body and an abutting plate provided on the outer side of the bracket cylinder body. A guiding groove is formed on the inner side of the bracket cylinder body, and the guiding groove extends along the sliding direction of the shock absorption bracket relative to the drive sleeve; the drive sleeve includes a drive sleeve body, and a guiding key is provided on the outer side of the drive sleeve body. The guiding key extends along the sliding direction of the shock absorption bracket relative to the drive sleeve, the guiding key is provided corresponding to the guiding groove of the shock absorption bracket, and the guiding key is engaged with the guiding groove.

[0013] In one embodiment, a support plate is further provided on the outer side of the drive sleeve body, the power head driving structure further includes an elastic member, and the elastic member is provided between the abutting plate of the shock absorption bracket and the support plate of the drive sleeve; a driving key is provided on the inner side of the drive sleeve body for cooperating with the drill pipe of the rotary drilling rig.

[0014] In one embodiment, a connecting portion is further provided on the outer side of the transmission shaft to connect a gear; a pin hole is further formed in the transmission shaft, and the power head driving structure further includes a pressure plate which is connected to the end of the transmission shaft opposite to the driving sleeve through a connecting member passing through the pin hole; a mud-proof hole is further formed in the end of the transmission shaft opposite to the end connected to the driving sleeve.

[0015] The present invention further provides a rotary drilling rig, which includes the above-mentioned power head driving structure.

[0016] In the power head driving structure and the rotary drilling rig of the present invention, since the driving disc and the transmission shaft are connected not only by fasteners but also by a connecting key, when subjected to a radial force, the connecting key can resist the radial force, and when subjected to an eccentric load, the connecting key can resist the eccentric load. Therefore, the strength of the power head driving structure is greatly improved, and the ability of the power head driving structure to resist loads is improved. In this way, the fasteners can also be protected and are not easily cut off under the action of the radial force. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the connection structure between the driving sleeve and the transmission shaft of a driving structure of a rotary drilling rig.

[0018] Figure 2 It is a schematic diagram of the connection structure between the driving sleeve and the transmission shaft of another driving structure of a rotary drilling rig.

[0019] Figure 3 It is a schematic diagram of the structure of the power head driving structure according to an embodiment of the present invention.

[0020] Figure 4 It is Figure 3 The partial enlarged view at IV in.

[0021] Figure 5 It is Figure 3 The half-sectional structure schematic diagram of the shock-absorbing bracket of the power head driving structure shown.

[0022] Figure 6 It is Figure 3 The top view schematic diagram of the shock-absorbing bracket of the power head driving structure shown.

[0023] Figure 7 It is Figure 3 The structure schematic diagram of the driving sleeve of the power head driving structure shown.

[0024] Figure 8 It is Figure 3 The connection schematic diagram between the driving sleeve and the drill pipe of the power head driving structure shown.

[0025] Figure 9 It is Figure 8 The partial enlarged view at IX in.

[0026] Figure 10 is Figure 3 a schematic cross-sectional structure view of a transmission shaft of the power head drive structure shown

[0027] Figure 11 is Figure 3 a schematic three-dimensional structure view of a transmission shaft of the power head drive structure shown

[0028] Figure 12 a schematic structure view of a rotary drilling rig according to an embodiment of the present invention Detailed implementation manners

[0029] To further elaborate on the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following, in combination with the accompanying drawings and embodiments, details the specific implementation manners, structures, features and their effects of the present invention as follows

[0030] As Figure 3 and Figure 4 shown, the power head drive structure of an embodiment of the present invention includes a shock absorption bracket 31, a drive sleeve 33 and a transmission shaft 35. The shock absorption bracket 31 is slidably connected to the drive sleeve 33, and the transmission shaft 35 is fixedly connected to the drive sleeve 33 through a fastener 37. The drive sleeve 33 is provided with a flange portion 332. The fastener 37 passes through the flange portion 332 and is inserted into the end of the transmission shaft 35. A connection key 39 for fixedly connecting the drive sleeve 33 and the transmission shaft 35 is further provided between the inner wall of the drive sleeve 33 and the outer wall of the transmission shaft 35

[0031] In this embodiment, please refer to Figure 5 and Figure 6 together. The shock absorption bracket 31 includes a bracket cylinder body 312 and a contact plate 314 provided on the outer side of the bracket cylinder body 312. A guide groove 316 is formed on the inner side of the bracket cylinder body 312. The guide groove 316 extends along the sliding direction of the shock absorption bracket 31 relative to the drive sleeve 33, that is, the guide groove 316 extends along the height direction of the bracket cylinder body 312. Specifically, the number of the guide grooves 316 can be multiple, and the multiple guide grooves 316 are arranged circumferentially along the bracket cylinder body 312

[0032] Specifically, a plurality of spaced inner plates 318 are provided on the inner side wall of the bracket cylinder body 312, and the interval between two adjacent inner plates 318 forms the above-mentioned guide groove 316

[0033] In this embodiment, please refer to Figure 7, the drive sleeve 33 includes a drive sleeve body 334. A guide key 335 is provided on the outer side of the drive sleeve body 334. The guide key 335 extends along the sliding direction of the shock-absorbing bracket 31 relative to the drive sleeve 33, that is, the guide key 335 extends along the height direction of the drive sleeve body 334. The guide key 335 is provided corresponding to the guide groove 316 of the shock-absorbing bracket 31. Correspondingly, the number of the guide keys 335 can be multiple, and the multiple guide keys 335 are arranged circumferentially along the drive sleeve body 334. The guide key 335 is used to cooperate with the guide groove 316. More specifically, the guide key 335 is used to be slidably arranged in the guide groove 316. Specifically, the guide key 335 is arranged on the outer side wall of the end portion close to the drive sleeve 33.

[0034] Specifically, the above-mentioned flange portion 332 is further provided on the outer side of the drive sleeve body 334 of the drive sleeve 33. Mounting holes 337 are formed in the flange portion 332 for the fasteners 37 to be inserted. Specifically, the flange portion 332 is connected to the drive sleeve body 334 by welding. The flange portion 332 can be arranged at the other end of the drive sleeve 33 opposite to the end where the guide key 335 is provided.

[0035] Specifically, a support plate 339 is further provided on the outer side of the drive sleeve body 334. In the height direction of the drive sleeve body 334, the support plate 339 is located between the flange portion 332 and the guide key 335. The power head drive structure further includes an elastic member 41, and the elastic member 41 is arranged between the abutting plate 314 of the shock-absorbing bracket 31 and the support plate 339 of the drive sleeve 33. Specifically, the elastic member 41 can be a telescopic spring, and both ends of the telescopic spring respectively abut between the abutting plate 314 and the support plate 339 to achieve shock absorption.

[0036] Specifically, a first key groove 341 is formed on the inner side of the drive sleeve body 334 to accommodate the connection key 39. The number of the first key grooves 341 can be multiple, and the multiple first key grooves 341 can be arranged circumferentially along the drive sleeve body 334. The first key groove 341 can be arranged at the other end of the drive sleeve 33 opposite to the end where the guide key 335 is provided, that is, the first key groove 341 and the flange portion 332 are located at the same end of the drive sleeve body 334. The first key groove 341 includes a semi-circular portion and a rectangular portion. The semi-circular portion is located at one end of the rectangular portion, and the end of the rectangular portion is flush with the end of the drive sleeve body 334, that is, one end of the first key groove 341 is open to facilitate the installation of the connection key 39.

[0037] Specifically, please refer to Figure 8 and Figure 9, on the inner side of the driving sleeve body 334, there is a driving key 343 for cooperating with the drill pipe 90 of the rotary drilling rig. On the outer side wall of the drill pipe 90, there is an outer drill pipe key 902 to cooperate with the driving member 343 to realize the connection between the driving sleeve 32 and the drill pipe 90, so that the drill pipe 90 can rotate together with the driving sleeve 33 and the transmission shaft 35. The number of the driving keys 343 can be multiple, and the multiple driving keys 343 are arranged at intervals along the circumferential direction of the driving sleeve body 334.

[0038] In this embodiment, please refer to Figures 10 to 11 , the transmission shaft 35 is a hollow cylindrical shape. On the inner side of the transmission shaft 35, there is a second keyway 352 corresponding to the first keyway 341 to accommodate the connecting key 39. Specifically, the second keyway 352 can be arranged at one end of the transmission shaft 35 adjacent to the driving sleeve 33. By arranging the first keyway 341 on the outer side wall of the driving sleeve body 334 and arranging the second keyway 352 on the inner side wall of the transmission shaft 35, one end of the driving sleeve 33 can be sleeved inside the transmission shaft 35, which can resist axial loads and eccentric loads. Specifically, the second keyway 352 includes two semi-circular parts and a rectangular part, and the two semi-circular parts are respectively located at both ends of the rectangular part. Specifically, the connecting key 39 also includes two semi-circular parts and a rectangular part, and the two semi-circular parts are respectively located at both ends of the rectangular part.

[0039] Specifically, on the inner side of the transmission shaft 35, there is also a boss 354 protruding towards the inside of the transmission shaft 35, and the second keyway 352 is arranged on the boss 354. By arranging the boss 354, the distance from the fastener 37 to the edge of the boss 354 can be effectively increased, that is, the distance from the fastener 37 to the driving sleeve body 334 can be increased, the fillet weld between the driving sleeve body 334 and the flange part 332 can be increased. On the one hand, the connection strength between the driving sleeve body 334 and the flange part 332 can be increased, and on the other hand, there is enough space to facilitate the installation of the fastener 37; at the same time, the boss 354 can also ensure the opening position of the second keyway 352. Specifically, the boss 354 is arranged at one end of the transmission shaft 35 adjacent to the driving sleeve.

[0040] Specifically, at one end of the transmission shaft 35 adjacent to the driving sleeve 33, there is also a connection hole 356 for connecting with the fastener 37. Specifically, the connection hole 356 is arranged at the position of the transmission shaft 35 where the boss 354 is provided to increase the distance between the connection hole 356 and the driving sleeve 33 when the transmission shaft 35 is connected to the driving sleeve 33. Specifically, the connection hole 356 can be a threaded hole. The fastener 37 can specifically be a bolt, and the fastener 37 passes through the installation hole 337 and is threadedly connected with the connection hole 356. Specifically, the connection hole 356 is arranged on the end face of the transmission shaft 35, that is, on the top of the transmission shaft 35.

[0041] Specifically, a connection part 358 is also provided on the outer side of the transmission shaft 35 to connect the gear 45, so as to transmit the power to the transmission shaft 35 and then to the drill pipe 90. The gear 45 can be connected to the connection part 358 of the transmission shaft 35 through a locking member 47.

[0042] Specifically, a pin hole 359 is also formed on the transmission shaft 35. Specifically, the pin hole 359 transversely penetrates the side wall of the transmission shaft 35. The pin hole 359 is formed at the opposite end of the transmission shaft 35 from the end connected to the drive sleeve 33. Specifically, the number of the pin holes 359 can be multiple, and the multiple pin holes 359 can be arranged along the circumferential direction of the transmission shaft 35.

[0043] Specifically, a mud-proof hole 361 is also formed at the opposite end of the transmission shaft 35 from the end connected to the drive sleeve 33, so that the muddy water lifted by the drill pipe is discharged from here. Specifically, the mud-proof hole 361 is formed on the end face of the transmission shaft 35. The number of the mud-proof holes 361 can be multiple.

[0044] Please refer to again Figure 3 The power head driving structure further includes a pressure plate 49, and the pressure plate 49 is connected to the end of the transmission shaft 35 opposite to the drive sleeve 33. Specifically, the pressure plate 49 is fixedly connected to the transmission shaft 35 through a connecting member 51. More specifically, a fixing plate 492 is provided on the pressure plate 49, and the connecting member 51 is a pin shaft, which passes through the fixing plate 492 of the pressure plate 49 and the pin hole 359 of the transmission shaft 35, so as to fixedly connect the pressure plate 49 to the transmission shaft 35.

[0045] It can be understood that in other embodiments, the connection key 39 can also be directly formed on the transmission shaft 35 or the drive sleeve 33 by integral molding or the like, and then cooperate with the key groove on the drive sleeve 33 or the transmission shaft 35. The connection key 39 can also be fixed on the transmission shaft 35 or the drive sleeve 33 by welding or the like, and then cooperate with the key groove on the drive sleeve 33 or the transmission shaft 35. It can be understood that the connection key 39 can also be fixed on the end face of the drive sleeve 33 (i.e., the bottom of the drive sleeve 33), and a key groove is formed on the end face of the transmission shaft 35, so that the connection key 39 cooperates with the key groove. It can be understood that the connection key 39 can also be fixed on the end face of the transmission shaft 35 (i.e., the top of the transmission shaft 35), and a key groove is formed on the end face of the drive sleeve 33, so that the connection key 39 cooperates with the key groove.

[0046] In the power head driving structure of the present invention, since the drive disk and the transmission shaft are connected not only by fasteners but also by a connection key, when subjected to a radial force, the connection key can resist the radial force, and when subjected to an eccentric load, the connection key can resist the eccentric load. Therefore, the strength of the power head driving structure is greatly improved, and the ability of the power head driving structure to resist loads is improved. In this way, the fasteners can also be protected and are not easily cut off under the action of the radial force.

[0047] Please refer to Figure 12, the present invention also provides a rotary drilling rig, which includes the above-mentioned power head drive structure.

[0048] The above are only the preferred embodiments of the present invention, and do not impose any form of limitation on the present invention. Although the present invention has been disclosed above with the preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to equivalent embodiments by using the above-disclosed technical content within the scope of the technical solution of the present invention. However, as long as it does not depart from the content of the technical solution of the present invention, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A power head drive structure, characterized in that, It includes a shock-absorbing bracket (31), a drive sleeve (33) and a transmission shaft (35). The shock-absorbing bracket (31) is slidably connected to the drive sleeve (33). The transmission shaft (35) is fixedly connected to the drive sleeve (33) through a fastener (37). A key (39) for fixedly connecting the drive sleeve (33) and the transmission shaft (35) is further provided between the drive sleeve (33) and the transmission shaft (35). The transmission shaft (35) is a hollow cylinder. A first keyway (341) is formed on the outer sidewall of the drive sleeve (33), and a second keyway (352) is formed on the inner sidewall of the transmission shaft (35). The key (39) is received in the first keyway (341) and the second keyway (352) so that one end of the drive sleeve (33) is sleeved inside the transmission shaft (35). A boss (354) protruding towards the inside of the transmission shaft (35) is further provided inside the transmission shaft (35). The fastener (37) is connected to the position of the transmission shaft (35) where the boss (354) is provided.

2. The power head drive structure according to claim 1, characterized in that, A flange portion (332) is further provided on the outer side of the drive sleeve body (334) of the drive sleeve (33). The flange portion (332) is provided at one end of the drive sleeve (33) where it is connected to the transmission shaft (35). A connection hole (356) is further formed at one end of the transmission shaft (35) adjacent to the drive sleeve (33). Mounting holes (337) are formed on the flange portion (332) for the fastener (37) to be inserted. The fastener (37) passes through the mounting hole (337) and is inserted into the connection hole (356).

3. The power head drive structure according to claim 1, characterized in that The shock-absorbing bracket (31) includes a bracket cylinder body (312) and a contact plate (314) provided on the outer side of the bracket cylinder body (312). A guide groove (316) is formed inside the bracket cylinder body (312). The guide groove (316) extends along the sliding direction of the shock-absorbing bracket (31) relative to the drive sleeve (33). The drive sleeve (33) includes a drive sleeve body (334). A guide key (335) is provided on the outer side of the drive sleeve body (334). The guide key (335) extends along the sliding direction of the shock-absorbing bracket (31) relative to the drive sleeve (33). The guide key (335) is provided corresponding to the guide groove (316) of the shock-absorbing bracket (31), and the guide key (335) cooperates with the guide groove (316).

4. The power head drive structure according to claim 3, characterized in that, A support plate (339) is further provided on the outer side of the drive sleeve body (334). The power head drive structure further includes an elastic member (41). The elastic member (41) is provided between the contact plate (314) of the shock-absorbing bracket (31) and the support plate (339) of the drive sleeve (33). A drive key (343) is provided inside the drive sleeve body (334) for cooperating with the drill pipe (90) of the rotary drilling rig.

5. The power head drive structure according to claim 1, characterized in that A connecting portion (358) is further provided on the outer side of the transmission shaft (35) for connecting a gear (45); a pin hole (359) is further formed in the transmission shaft (35), and the power head driving structure further includes a pressure plate (49), and the pressure plate (49) is connected to one end of the transmission shaft (35) opposite to the drive sleeve (33) through a connecting member (51) passing through the pin hole (359); a mud-proof hole (361) is further formed in the opposite end of the transmission shaft (35) to the connection end of the drive sleeve (33).

6. A rotary drilling rig, characterized in that, It includes the power head driving structure according to any one of claims 1-5.

Images