A telescopic drill pipe arrangement for a down-the-hole hammer

Abstract

A telescopic drill rod device for a down-the-hole hammer, a rotating air passing mechanism: an annular limiting step fixed sleeve is arranged on the outside of the right part of a rotating main shaft; a main shaft bushing is coaxially fixedly sleeved on the outside of the rotating main shaft, and an annular cavity is formed between the two, a radial communication hole one is formed on the main shaft bushing; an axial through hole which communicates with the annular cavity is formed on the annular limiting step; a rotating shaft sleeve is rotatably sleeved on the outside of the main shaft bushing, an annular groove is formed on the inside of the middle part, and a radial communication hole two is formed on the outside of the middle part; a telescopic rod body: an outer cylinder body is connected with the rotating main shaft through a flange, the outer cylinder body is sleeved on the outside of an inner cylinder body, a left radial baffle is used for limiting the left end of the inner cylinder body, and is also used for fixing an inner pipe in the telescopic air passing mechanism, a right radial baffle is used for fixing an outer pipe in the telescopic air passing mechanism, and is also used for closing the inner cylinder body, and a buffer air chamber is used for establishing a gas supply passage between the inner pipe and an inner joint. The drill rod has a telescopic function.

Description

Technical Field

[0001] This invention belongs to the technical field of construction and bridge construction equipment, and specifically relates to a telescopic drill rod device for down-the-hole hammers. Background Technology

[0002] In existing technologies, the drill rods of down-the-hole hammers are all of fixed length. When drilling to greater depths, it is often necessary to use multiple rods cascaded together. However, for some specific working conditions, the drilling depth is often greater than the length of one drill rod but less than the length of two drill rods. When encountering such conditions, if two drill rods are cascaded together, the complexity of the cascading operation will increase the number of work steps, which will greatly reduce the efficiency of hole formation and also bring a greater workload to the operators.

[0003] During down-the-hole (DH) hammer drilling, the drill rod connects both the power head and the hammer head. This necessitates both torque transmission and synchronized airflow to power the hammer. Therefore, for drill rods with telescopic capabilities, a reliable airflow supply during telescopic movement is crucial to ensure stable and reliable hole-forming operations.

[0004] To address the issue of the limited structural design of current down-the-hole hammer drill rods, there is an urgent need to provide a down-the-hole hammer drill rod device with telescopic functionality. Summary of the Invention

[0005] To address the problems existing in the prior art, the present invention provides a telescopic drill rod device for down-the-hole hammers. This drill rod device has a telescopic function, which can meet the needs of special hole-forming operations, simplify the operation process, improve operation efficiency, and reduce the labor load of operators. In addition, it can ensure a reliable supply of air during the telescopic process.

[0006] To achieve the above objectives, the present invention provides a telescopic drill rod device for a down-the-hole hammer, comprising a rotating air passage mechanism and a telescopic rod body;

[0007] The rotating air passage mechanism includes a rotating main shaft, an annular limiting step, a main shaft bushing, and a rotating shaft sleeve;

[0008] An axial through cavity is provided at the center of the rotating spindle. A first connecting flange is fixedly connected to the outer side of its left end, and a second connecting flange is fixedly connected to the outer side of its right end. The annular limiting step is fixedly fitted on the outer side of the right part of the rotating spindle. The spindle bushing is coaxially fixedly fitted on the outer side of the rotating spindle. Its left end is fixedly connected to the left end of the rotating spindle, and its right end is fixedly connected to the left end face of the annular limiting step. A gap is left between its middle part and the middle part of the rotating spindle to form an annular cavity. At least two radial connecting holes are provided on the annular bushing in the circumferential direction. The inner end of the radial connecting hole communicates with the annular cavity, and its outer end extends to the outer circular surface of the spindle bushing. At least two axial through holes are provided on the annular limiting step in the circumferential direction. The left end of the axial through hole communicates with the annular cavity, and an air passage connector is installed inside its right end.

[0009] The inner diameter of the rotating bushing is adapted to the outer diameter of the main bushing and is fitted onto the outer side of the middle part of the main bushing. A left annular mounting groove and a right annular mounting groove are respectively provided on the inner side of the left and right ends of the rotating bushing, and are rotatably connected to the main bushing via a left bearing installed in the left annular mounting groove and a right bearing installed in the right annular mounting groove. An annular groove is provided on the inner side of the middle part of the rotating bushing in the portion corresponding to the first radial connecting hole. The inner annular opening end of the annular groove communicates with the two first radial connecting holes. At least two second radial connecting holes are provided on the outer side of the middle part of the rotating bushing along the circumferential direction. The inner end of the second radial connecting hole is connected through to the outer closed end of the annular groove, and its outer end extends to the outer circular surface of the rotating bushing. A left annular boss is formed in the portion between the annular groove and the left annular mounting groove inside the rotating bushing, and a right annular boss is formed in the portion between the annular groove and the right annular mounting groove. The inner circular surfaces of both the left and right annular bosses are rotatably sealed with the main bushing.

[0010] The telescopic rod includes an outer cylinder, a left radial baffle, an inner cylinder, a right radial baffle, a buffer air chamber, an inner connector, and a telescopic air passage mechanism. The left end of the outer cylinder is fixedly connected to a third connecting flange. The center of the third connecting flange has a through hole adapted to the axial through cavity, and the third connecting flange is coaxially fixedly connected to the second connecting flange. Several key plates are uniformly fixedly connected to the outer side of the left part of the outer cylinder in a circumferential direction. Several key plates are uniformly fixedly connected to the inner side of the left part in a circumferential direction. Several key plates are uniformly fixedly connected to the inner side of the right part in a circumferential direction. The length direction of key plates two and key plates three extends axially, and the number of key plates two and three is the same. Their positions correspond to each other.

[0011] The left radial baffle is set in the inner cavity of the outer cylinder and is located on the left side of the left end of the multiple key plates. Its outer circular surface is fixedly connected to the inner side wall of the outer cylinder. A through hole two is opened at the axis of the left radial baffle, and an eccentric mounting hole one is opened on the outside of the through hole two. The inner diameter of the through hole two is smaller than the inner diameter of the through hole one, and the eccentric mounting hole one is located on the outside of the through hole one.

[0012] The inner cylinder is coaxially inserted inside the outer cylinder and located to the right of the left radial baffle. Multiple pairs of key plates four are uniformly fixedly connected circumferentially on the outer circular surface of the left end of the inner cylinder. The multiple pairs of key plates four are correspondingly arranged with multiple key plates three. When the inner cylinder is in a fully retracted state, each pair of key plates four is located on the outer sides of a corresponding key plate two. When the inner cylinder is in a fully extended state, each pair of key plates four is located on the outer sides of a corresponding key plate three. An arc-shaped limiting plate is fixedly connected between the right ends of each pair of adjacent key plates three. The outer arc surface of the arc-shaped limiting plate is fixedly connected to the inner sidewall of the outer cylinder. The multiple arc-shaped limiting plates slide and seal with the outer circular surface of the inner cylinder and are used to limit the right side of the multiple key plates four.

[0013] The right radial baffle is located on the right side of the inner cylinder cavity. The outer diameter of the right radial baffle is adapted to the outer diameter of the inner cylinder, and the outer circular surface of the right radial baffle is fixedly connected to the inner wall of the inner cylinder. The right radial baffle has an eccentric mounting hole two at the position corresponding to the eccentric mounting hole one. The buffer chamber is cylindrical in shape and is coaxially fixedly connected to the inside of the inner cylinder, located on the right side of the right radial baffle. The left end plate of the buffer chamber has an air supply mounting hole at the position corresponding to the eccentric mounting hole two, and a connector mounting hole is opened at the center of its right end plate. The inner connector is coaxially located inside the right end of the inner cylinder, and the left end of the inner connector is fixedly inserted into the connector mounting hole. The outer side of the middle part of the inner connector is fixedly connected to the inner wall of the inner cylinder through multiple annular connecting plates. An axially penetrating stepped cavity is opened at the center of the inner connector. The stepped cavity includes a connecting cavity located at the left end of the inner connector and a connector receiving cavity located on the right side of the connecting cavity, wherein the inner diameter of the connecting cavity is smaller than the inner diameter of the connector receiving cavity.

[0014] The telescopic air passage mechanism includes an outer tube, an inner tube, and an air inlet pipe. The outer tube is fixedly connected to the inside of the inner cylinder at two eccentric mounting holes. The left end of the outer tube is flush with the left end of the inner cylinder. An air outlet connector is installed inside the right end of the outer tube. The right end of the outer tube is fixedly inserted into the second eccentric mounting hole, and the right end of the air outlet connector is fixedly inserted into the air supply mounting hole. The inner tube is coaxially arranged inside the outer tube. A guide ring is fixedly connected to the outside of its right end. The outer diameter of the guide ring is adapted to the inner diameter of the outer tube and slides and seals with the outer tube. The left part of the inner tube is fixedly inserted into the first eccentric mounting hole, and an air inlet connector is fixedly connected to the left side of the left radial baffle at the left end of the inner tube. The outer circular surface of the left end of the inner tube is fixedly connected to the inner side wall of the outer cylinder through a radial connecting plate. The right end of the air inlet pipe is fixedly connected to the air inlet connector. The left end of the air inlet pipe passes through the third connecting flange and the second connecting flange in sequence and is connected to two air inlet connectors through a connecting pipe.

[0015] As a preferred embodiment, the device further includes a left annular cover and a right annular cover. The left end of the left annular mounting groove extends to the left end face of the rotating spindle, and the right end of the right annular mounting groove extends to the right end face of the rotating spindle. The left annular cover is rotatably fitted onto the outer side of the left part of the rotating spindle and is fixedly connected to the left end of the rotating shaft sleeve, thereby closing the left opening end of the left annular mounting groove. The right annular cover is rotatably fitted onto the outer side of the right part of the rotating spindle and is fixedly connected to the right end of the rotating shaft sleeve, thereby closing the right opening end of the right annular mounting groove.

[0016] Furthermore, to ensure a stable and reliable connection between the rod and the working equipment, two semi-circular inner pin grooves are provided at intervals on the upper left and lower right sides of the joint receiving cavity, with the inner pin grooves extending in the front-back direction; two pairs of through grooves are provided on the inner cylinder corresponding to the two inner pin grooves, with each pair of through grooves being coaxially arranged with the corresponding inner pin groove for the insertion or removal of the pin shaft;

[0017] Furthermore, in order to improve the sealing performance, annular sealing grooves are provided in the middle of the inner circular surfaces of the left and right annular bosses, and annular sealing rings are installed in each annular sealing groove.

[0018] Furthermore, to ensure the reliability and stability of the connection, the inner connector is an internal hexagonal connector.

[0019] As a preferred embodiment, the rotating spindle and the second connecting flange are an integral structure; the rotating spindle and the first connecting flange are connected by bolts.

[0020] As a preferred embodiment, the buffer chamber comprises a cylindrical body, a left end plate fixedly encapsulated at the left opening end of the cylindrical body, and a right end plate fixedly encapsulated at the right opening end of the cylindrical body.

[0021] As a preferred embodiment, the diameter of the second radial connecting hole is smaller than the length of the annular groove in the left-right direction; the diameter of the first radial connecting hole is smaller than the diameter of the second radial connecting hole.

[0022] In this invention, a first connecting flange and a second connecting flange are connected to the left and right ends of the rotating spindle, respectively, which facilitates the establishment of a stable and reliable connection between the rotating air-passing mechanism and external equipment. The spindle bushing is coaxially positioned on the outside of the rotating spindle, allowing for the formation of an annular space between them through a clearance fit. This ensures a fixed connection between the left end of the spindle bushing and the left end of the rotating spindle. Simultaneously, the annular limiting step, fixedly mounted on the right side of the rotating spindle, is fixedly connected to the right end of the spindle bushing, facilitating the sealing of both ends of the formed annular space, thus creating a sealed annular cavity. The radial connecting hole facilitates the establishment of a communication channel between the annular cavity and the external space. Connecting the rotating bushing to the outside of the spindle bushing using left and right bearings effectively reduces the frictional resistance between the rotating bushing and the spindle bushing, and improves stability during rotation. By setting left and right annular bosses on the left and right sides of the annular groove respectively, the airtightness between the annular groove and the first radial connecting hole can be effectively ensured. The second radial connecting hole facilitates the connection of an external gas supply pipeline, thereby allowing high-pressure gas from the outside to be supplied into the annular cavity through the second radial connecting hole, the annular groove, and the first radial connecting hole. By providing an axial through hole on the annular limiting step that communicates with the annular cavity, a connection channel between the rotary air passage mechanism and the telescopic air supply mechanism can be easily established using the axial through hole. Multiple key plates are fixedly connected to the outer circumference of the outer cylinder, facilitating its assembly into the power head and rotation via the power head. The inner cylinder is slidably inserted into the outer cylinder. Simultaneously, multiple key plates are fixedly connected to the inner left side and the inner right side of the outer cylinder, and multiple pairs of key plates are fixedly connected to the outer left side of the inner cylinder. When the inner cylinder is fully retracted, the multiple pairs of key plates can radially limit the movement of the multiple key plates and reliably transmit torque. When the inner cylinder is fully extended, the multiple pairs of key plates can radially limit the movement of the multiple key plates and reliably transmit torque. Thus, whether the inner cylinder is retracted or extended, the rotation of the inner cylinder is synchronized with the rotation of the outer cylinder driven by the power head, thereby completing the power transmission process. A left radial baffle is fixedly connected to the left side of the inner cylinder's inner cavity, and a second through hole is opened in the center of the left radial baffle. The left radial baffle not only limits the left end of the inner cylinder, but the second through hole also allows for the supply of high-pressure gas into the inner cylinder's inner cavity. A right radial baffle is fixedly connected to the right side of the inner cylinder's inner cavity, sealing off the right side of the inner cylinder. This allows the high-pressure gas entering the inner cylinder's inner cavity to fully act on the right radial baffle, thereby pushing the inner cylinder outwards from the outer cylinder.The outer tube is fixedly connected to the inner cylinder, with its right end fixedly inserted into the eccentric mounting hole two on the right radial baffle. This ensures that the gas entering the outer tube passes through the space on the right side of the right radial baffle. The inner tube is inserted inside the outer tube, with its left end fixedly inserted into the eccentric mounting hole one on the left radial baffle. This facilitates a reliable connection between the left end of the inner tube and the external gas supply mechanism. A guide ring is fixedly connected to the right end of the inner tube, which slides and seals with the outer tube. This ensures a good seal between the two, allowing the gas entering the inner tube to be stably and reliably output through the right end of the outer tube during expansion and contraction. An outlet connector is fixedly connected to the right end of the outer pipe, and the right end of the outlet connector is fixedly inserted into the inlet mounting hole on the left end plate of the buffer gas chamber. Simultaneously, the left end of the inner connector is fixedly inserted into the connector mounting hole on the right end plate of the buffer gas chamber. This ensures a stable and reliable supply of high-pressure gas from the outer pipe to the buffer gas chamber, and then from the buffer gas chamber to the stepped cavity of the inner connector, thus supplying the working equipment. Placing the buffer gas chamber between the telescopic gas supply mechanism and the inner connector creates a buffering effect on the supplied gas, thereby facilitating a stable and reliable supply of working gas. An axial gas supply channel is formed by the corresponding arrangement of the axial through cavity of the rotating spindle shaft in the rotating gas mechanism, the through hole one at the center of the third connecting flange, and the through hole two at the center of the left radial baffle. This allows for the supply of high-pressure gas to the interior of the inner cylinder during operation, enabling the inner cylinder to move away from the outer cylinder, thus facilitating the telescopic function of the rod. This drill pipe device features a telescopic function to meet the needs of special operations. Furthermore, its telescopic control process is convenient and quick, effectively simplifying the work procedure, improving drilling efficiency, and reducing the workload of operators. Additionally, it is equipped with an internal telescopic air supply mechanism to ensure a stable and reliable air supply during the pipe's extension and retraction. Its significant economic benefits make it highly valuable for widespread application. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 This is a schematic diagram of the rotating air passage mechanism in this invention;

[0025] Figure 3 This is a schematic diagram of the telescopic rod in this invention;

[0026] Figure 4 This is a schematic diagram of the assembly between the outer cylinder and the inner cylinder in this invention.

[0027] In the diagram: 1. Rotary air passage mechanism; 2. Telescopic rod; 3. Rotary main shaft; 4. Rotary bushing; 5. Axial through cavity; 6. First connecting flange; 7. Second connecting flange; 8. Annular cavity; 9. Radial connecting hole one; 10. Annular sealing groove; 11. Annular limiting step; 12. Left annular mounting groove; 13. Right annular mounting groove; 14. Left bearing; 15. Right bearing; 16. Annular groove; 17. Radial connecting hole two; 18. Outer cylinder; 19. Third connecting flange; 20. Through hole one; 21. Key plate one; 22. Key plate three; 23. Left radial baffle; 24. Through hole two; 25. Eccentric mounting hole one; 26. Inner cylinder; 27. Key plate two; 28. Right... 29. Radial baffle, 30. Eccentric mounting hole 2, 31. Buffer air chamber, 32. Air supply mounting hole, 33. Connector mounting hole, 34. Inner connector, 35. Connector receiving cavity, 36. Annular connecting plate, 37. Telescopic air passage mechanism, 38. Outer pipe, 39. Inner pipe, 40. Air outlet connector, 41. Guide ring, 42. Air inlet connector, 43. Radial connecting plate, 44. Inner pin groove, 45. Left annular gland, 46. Right annular gland, 47. Axial through hole, 48. Main shaft bushing, 49. Air passage connector, 50. Air inlet pipe, 51. Left end plate, 52. Right end plate, 53. Cylindrical body, 54. Left annular boss, 55. Right annular boss, 56. Key plate 4. Detailed Implementation

[0028] The invention will now be further described with reference to the accompanying drawings.

[0029] like Figures 1 to 4 As shown, the present invention provides a telescopic drill rod device for down-the-hole hammer, including a rotating air passage mechanism 1 and a telescopic rod body 2;

[0030] The rotating air passage mechanism 1 includes a rotating main shaft 3, an annular limiting step 11, a main shaft bushing 48, and a rotating bushing 4;

[0031] The rotating spindle 3 has an axially penetrating cavity 5 at its axis. A first connecting flange 6 is fixedly connected to the outer side of its left end, and a second connecting flange 7 is fixedly connected to the outer side of its right end. The annular limiting step 11 is fixedly fitted on the outer side of the right part of the rotating spindle 3. The spindle bushing 48 is coaxially fixedly fitted on the outer side of the rotating spindle 3. Its left end is fixedly connected to the left end of the rotating spindle 3, and its right end is fixedly connected to the left end face of the annular limiting step 11. A gap is left between its middle part and the middle part of the rotating spindle 3 to form an annular cavity 8. At least two radially communicating holes 9 are opened in the annular direction of the spindle bushing 48. The inner end of the radially communicating hole 9 communicates with the annular cavity 8, and its outer end extends to the outer circular surface of the spindle bushing 48. At least two axially through holes 47 are opened in the annular direction on the annular limiting step 11. The left end of the axially through hole 47 communicates with the annular cavity 8, and an air connector 49 is installed inside its right end.

[0032] The inner diameter of the rotating bushing 4 is adapted to the outer diameter of the main shaft bushing 48, and it is fitted onto the outer side of the middle part of the main shaft bushing 48. A left annular mounting groove 12 and a right annular mounting groove 13 are respectively provided on the inner side of the left and right ends of the rotating bushing 4, and it is rotatably connected to the main shaft bushing 48 via a left bearing 14 installed in the left annular mounting groove 12 and a right bearing 15 installed in the right annular mounting groove 13. An annular groove 16 is provided on the inner side of the middle part of the rotating bushing 4 in the portion corresponding to the radial connecting hole 9, and the inner annular opening end of the annular groove 16 connects to the two radial connecting holes. The two radially communicating holes 17 are interconnected. At least two radially communicating holes 17 are opened on the outer side of the middle part of the rotating bushing 4 along the circumferential direction. The inner end of the radially communicating hole 17 is connected to the outer closed end of the annular groove 16, and its outer end extends to the outer circular surface of the rotating bushing 4. A left annular boss 54 is formed in the part between the annular groove 16 and the left annular mounting groove 12, and a right annular boss 55 is formed in the part between the annular groove 16 and the right annular mounting groove 13. The inner circular surfaces of the left annular boss 54 and the right annular boss 55 are rotated and sealed with the main shaft bushing 48.

[0033] The telescopic rod 2 includes an outer cylinder 18, a left radial baffle 23, an inner cylinder 26, a right radial baffle 28, a buffer air chamber 30, an inner connector 33, and a telescopic air passage mechanism 37. The left end of the outer cylinder 18 is fixedly connected to a third connecting flange 19. The center of the third connecting flange 19 has a through hole 20 that matches the axial through cavity 5, and the third connecting flange 19 is coaxially fixedly connected to the second connecting flange 7. Several key plates 21 are uniformly fixedly connected to the outer side of the left part of the outer cylinder 18 in a circumferential direction. Several key plates 27 are uniformly fixedly connected to the inner side of the left part in a circumferential direction. Several key plates 32 are uniformly fixedly connected to the inner side of the right part in a circumferential direction. The length direction of key plates 27 and key plates 32 extends axially, and the number of them is the same, and their positions are corresponding. The arrangement of several key plates 21 facilitates connection with the power head and allows for rotational movement under the drive of the power head.

[0034] As a preferred embodiment, the right end of the key plate 22 extends to the right end of the outer cylinder 18, thereby allowing the inner cylinder 26 to have a greater extension distance relative to the outer cylinder 1.

[0035] The left radial baffle 23 is disposed in the inner cavity of the outer cylinder 18 and is located on the left side of the left end of the multiple key plates 22. Its outer circular surface is fixedly connected to the inner side wall of the outer cylinder 18. A through hole 24 is provided at the axis of the left radial baffle 23, and an eccentric mounting hole 25 is provided on the outside of the through hole 24. The inner diameter of the through hole 24 is smaller than the inner diameter of the through hole 20, and the eccentric mounting hole 25 is located on the outside of the through hole 20.

[0036] The inner cylinder 26 is coaxially inserted inside the outer cylinder 18 and located to the right of the left radial baffle 23. Multiple pairs of key plates 4 56 are uniformly fixedly connected circumferentially on the outer circular surface of the left end of the inner cylinder 26. The multiple pairs of key plates 4 56 are correspondingly arranged with multiple key plates 3 22. When the inner cylinder 26 is in a fully retracted state, each pair of key plates 4 56 is located on the outer sides of a corresponding key plate 27. When the inner cylinder 26 is in a fully extended state, each pair of key plates 4 56 is located on the outer sides of a corresponding key plate 3 22. An arc-shaped limiting plate is fixedly connected between the right ends of each pair of adjacent key plates 3 22. The outer arc surface of the arc-shaped limiting plate is fixedly connected to the inner sidewall of the outer cylinder 18. The multiple arc-shaped limiting plates slide and seal with the outer circular surface of the inner cylinder 26 and are used to limit the right side of the multiple key plates 4 56.

[0037] The right radial baffle 28 is located on the right side of the inner cavity of the inner cylinder 26, and its outer diameter is adapted to the outer diameter of the inner cylinder 26. Its outer circular surface is fixedly connected to the inner wall of the inner cylinder 26. The right radial baffle 28 has an eccentric mounting hole 29 at the position corresponding to the first eccentric mounting hole 25. The buffer chamber 30 is cylindrical in shape and is coaxially fixedly connected to the inside of the inner cylinder 26, located to the right of the right radial baffle 28. The left end plate 51 of the buffer chamber 30 has an air supply mounting hole 31 at the position corresponding to the second eccentric mounting hole 29, and its right end plate... A connector mounting hole 32 is provided at the center of the shaft on the 52; the inner connector 33 is coaxially disposed inside the right end of the inner cylinder 26, and the left end of the inner connector 33 is fixedly inserted into the connector mounting hole 32. The outer side of the middle part of the inner connector 33 is fixedly connected to the inner wall of the inner cylinder 26 through multiple annular connecting plates 36; an axially penetrating stepped cavity is provided at the center of the shaft of the inner connector 33; the stepped cavity includes a connecting cavity 34 located at the left end of the inner connector 33 and a connector receiving cavity 35 located on the right side of the connecting cavity 34, wherein the inner diameter of the connecting cavity 34 is smaller than the inner diameter of the connector receiving cavity 35;

[0038] To ensure a stable and reliable connection between the rod and the working equipment, two semi-circular inner pin grooves 44 are provided at intervals on the upper left and lower right sides of the joint receiving cavity 35, and the inner pin grooves 44 extend in the front-back direction; two pairs of through grooves are provided on the inner cylinder 26 corresponding to the two inner pin grooves 44, and each pair of through grooves is coaxially arranged with the corresponding inner pin groove 44 for the insertion or removal of the pin.

[0039] The telescopic air passage mechanism 37 includes an outer tube 38, an inner tube 39, and an air inlet pipe 50. The outer tube 38 is fixedly connected to the inside of the inner cylinder 26 corresponding to the eccentric mounting hole 29. The left end of the outer tube 38 is flush with the left end of the inner cylinder 26. An air outlet connector 40 is installed inside the right end of the outer tube 38. The right end of the outer tube 38 is fixedly inserted into the eccentric mounting hole 29, and the right end of the air outlet connector 40 is fixedly inserted into the air supply mounting hole 31. The inner tube 39 is coaxially disposed inside the outer tube 38, and a guide ring 41 is fixedly connected to the outside of its right end. The outer diameter of the inner tube 39 is adapted to the inner diameter of the outer tube 38 and slides and seals with the outer tube 38; the left part of the inner tube 39 is fixedly inserted into the eccentric mounting hole 25, and the left end of the inner tube 39 is fixedly connected to the left side of the left radial baffle 23 with an air inlet connector 42. The outer circular surface of the left end of the inner tube 39 is fixedly connected to the inner side wall of the outer cylinder 18 through the radial connecting plate 43; the right end of the air inlet pipe 50 is fixedly connected to the air inlet connector 42, and the left end of the air inlet pipe 50 is connected to the two air inlet connectors 49 through the connecting pipe after passing through the third connecting flange 19 and the second connecting flange 7 in sequence.

[0040] As a preferred embodiment, the device also includes a left annular cover 45 and a right annular cover 46. The left end of the left annular mounting groove 12 extends to the left end face of the rotating spindle 3, and the right end of the right annular mounting groove 13 extends to the right end face of the rotating spindle 3. The left annular cover 45 is rotatably fitted onto the outer side of the left part of the rotating spindle 3 and is fixedly connected to the left end of the rotating bushing 4, for closing the left opening end of the left annular mounting groove 12. The right annular cover 46 is rotatably fitted onto the outer side of the right part of the rotating spindle 3 and is fixedly connected to the right end of the rotating bushing 4, for closing the right opening end of the right annular mounting groove 13.

[0041] To improve sealing performance, annular sealing grooves 10 are provided in the middle of the inner circular surfaces of the left annular boss 54 and the right annular boss 55, and annular sealing rings are installed in each annular sealing groove 10.

[0042] The internal connector 33 is an internal hexagonal connector.

[0043] To ensure the reliability and stability of the connection, the rotating spindle 3 and the second connecting flange 7 are an integral structure; the rotating spindle 3 and the first connecting flange 6 are connected by bolts.

[0044] As a preferred embodiment, the buffer air chamber 30 is composed of a cylindrical body 53, a left end plate 51 fixedly encapsulated at the left opening end of the cylindrical body 53, and a right end plate 52 fixedly encapsulated at the right opening end of the cylindrical body 53.

[0045] As a preferred embodiment, the diameter of the second radial connecting hole 17 is smaller than the length of the annular groove 16 in the left-right direction; the diameter of the first radial connecting hole 9 is smaller than the diameter of the second radial connecting hole 17.

[0046] In this invention, a first connecting flange and a second connecting flange are connected to the left and right ends of the rotating spindle, respectively, which facilitates the establishment of a stable and reliable connection between the rotating air-passing mechanism and external equipment. The spindle bushing is coaxially positioned on the outside of the rotating spindle, allowing for the formation of an annular space between them through a clearance fit. This ensures a fixed connection between the left end of the spindle bushing and the left end of the rotating spindle. Simultaneously, the annular limiting step, fixedly mounted on the right side of the rotating spindle, is fixedly connected to the right end of the spindle bushing, facilitating the sealing of both ends of the formed annular space, thus creating a sealed annular cavity. The radial connecting hole facilitates the establishment of a communication channel between the annular cavity and the external space. Connecting the rotating bushing to the outside of the spindle bushing using left and right bearings effectively reduces the frictional resistance between the rotating bushing and the spindle bushing, and improves stability during rotation. By setting left and right annular bosses on the left and right sides of the annular groove respectively, the airtightness between the annular groove and the first radial connecting hole can be effectively ensured. The second radial connecting hole facilitates the connection of an external gas supply pipeline, thereby allowing high-pressure gas from the outside to be supplied into the annular cavity through the second radial connecting hole, the annular groove, and the first radial connecting hole. By providing an axial through hole on the annular limiting step that communicates with the annular cavity, a connection channel between the rotary air passage mechanism and the telescopic air supply mechanism can be easily established using the axial through hole. Multiple key plates are fixedly connected to the outer circumference of the outer cylinder, facilitating its assembly into the power head and rotation via the power head. The inner cylinder is slidably inserted into the outer cylinder. Simultaneously, multiple key plates are fixedly connected to the inner left side and the inner right side of the outer cylinder, and multiple pairs of key plates are fixedly connected to the outer left side of the inner cylinder. When the inner cylinder is fully retracted, the multiple pairs of key plates can radially limit the movement of the multiple key plates and reliably transmit torque. When the inner cylinder is fully extended, the multiple pairs of key plates can radially limit the movement of the multiple key plates and reliably transmit torque. Thus, whether the inner cylinder is retracted or extended, the rotation of the inner cylinder is synchronized with the rotation of the outer cylinder driven by the power head, thereby completing the power transmission process. A left radial baffle is fixedly connected to the left side of the inner cylinder's inner cavity, and a second through hole is opened in the center of the left radial baffle. The left radial baffle not only limits the left end of the inner cylinder, but the second through hole also allows for the supply of high-pressure gas into the inner cylinder's inner cavity. A right radial baffle is fixedly connected to the right side of the inner cylinder's inner cavity, sealing off the right side of the inner cylinder. This allows the high-pressure gas entering the inner cylinder's inner cavity to fully act on the right radial baffle, thereby pushing the inner cylinder outwards from the outer cylinder.The outer tube is fixedly connected to the inner cylinder, with its right end fixedly inserted into the eccentric mounting hole two on the right radial baffle. This ensures that the gas entering the outer tube passes through the space on the right side of the right radial baffle. The inner tube is inserted inside the outer tube, with its left end fixedly inserted into the eccentric mounting hole one on the left radial baffle. This facilitates a reliable connection between the left end of the inner tube and the external gas supply mechanism. A guide ring is fixedly connected to the right end of the inner tube, which slides and seals with the outer tube. This ensures a good seal between the two, allowing the gas entering the inner tube to be stably and reliably output through the right end of the outer tube during expansion and contraction. An outlet connector is fixedly connected to the right end of the outer pipe, and the right end of the outlet connector is fixedly inserted into the inlet mounting hole on the left end plate of the buffer gas chamber. Simultaneously, the left end of the inner connector is fixedly inserted into the connector mounting hole on the right end plate of the buffer gas chamber. This ensures a stable and reliable supply of high-pressure gas from the outer pipe to the buffer gas chamber, and then from the buffer gas chamber to the stepped cavity of the inner connector, thus supplying the working equipment. Placing the buffer gas chamber between the telescopic gas supply mechanism and the inner connector creates a buffering effect on the supplied gas, thereby facilitating a stable and reliable supply of working gas. An axial gas supply channel is formed by the corresponding arrangement of the axial through cavity of the rotating spindle shaft in the rotating gas mechanism, the through hole one at the center of the third connecting flange, and the through hole two at the center of the left radial baffle. This allows for the supply of high-pressure gas to the interior of the inner cylinder during operation, enabling the inner cylinder to move away from the outer cylinder, thus facilitating the telescopic function of the rod. This drill pipe device features a telescopic function to meet the needs of special operations. Furthermore, its telescopic control process is convenient and quick, effectively simplifying the work procedure, improving drilling efficiency, and reducing the workload of operators. Additionally, it is equipped with an internal telescopic air supply mechanism to ensure a stable and reliable air supply during the pipe's extension and retraction. Its significant economic benefits make it highly valuable for widespread application.

Claims

1. A telescopic drill rod device for a down-the-hole hammer, comprising a rotating air passage mechanism (1) and a telescopic rod body (2), characterized in that... ； The rotating air passage mechanism (1) includes a rotating main shaft (3), an annular limiting step (11), a main shaft bushing (48), and a rotating bushing (4). The rotating spindle (3) has an axially penetrating cavity (5) at its center. A first connecting flange (6) is fixedly connected to the outer side of its left end, and a second connecting flange (7) is fixedly connected to the outer side of its right end. The annular limiting step (11) is fixedly fitted on the outer side of the right side of the rotating spindle (3). The spindle bushing (48) is coaxially fixedly fitted on the outer side of the rotating spindle (3). Its left end is fixedly connected to the left end of the rotating spindle (3), and its right end is fixedly connected to the left end face of the annular limiting step (11). Its middle part is connected to the rotating spindle (3). A gap is left between the middle parts of the main shaft (3) to form an annular cavity (8). At least two radial connecting holes (9) are opened in the annular direction of the main shaft bushing (48). The inner end of the radial connecting hole (9) is connected to the annular cavity (8), and its outer end extends to the outer circle surface of the main shaft bushing (48). At least two axial through holes (47) are opened in the annular limiting step (11) along the annular direction. The left end of the axial through hole (47) is connected to the annular cavity (8), and an air passage connector (49) is installed inside its right end. The inner diameter of the rotating bushing (4) is adapted to the outer diameter of the main bushing (48), and is fitted on the outer side of the middle part of the main bushing (48); the inner side of the left end and the inner side of the right end of the rotating bushing (4) are respectively provided with a left annular mounting groove (12) and a right annular mounting groove (13), and are rotatably connected to the main bushing (48) through a left bearing (14) installed in the left annular mounting groove (12) and a right bearing (15) installed in the right annular mounting groove (13); the inner side of the middle part of the rotating bushing (4) is provided with an annular groove (16) in the part corresponding to the radial connecting hole (9), and the inner annular opening end of the annular groove (16) is connected to the two radial connecting holes (9). (9) Interconnected, at least two radial connecting holes (17) are opened on the outer side of the middle part of the rotating bushing (4) along the circumferential direction. The inner end of the radial connecting hole (17) is connected to the outer closed end of the annular groove (16) and its outer end extends to the outer circular surface of the rotating bushing (4). The part between the annular groove (16) and the left annular mounting groove (12) inside the rotating bushing (4) forms a left annular boss (54), and the part between the annular groove (16) and the right annular mounting groove (13) forms a right annular boss (55). The inner circular surfaces of the left annular boss (54) and the right annular boss (55) are rotated and sealed with the main shaft bushing (48). The telescopic rod (2) includes an outer cylinder (18), a left radial baffle (23), an inner cylinder (26), a right radial baffle (28), a buffer air chamber (30), an inner connector (33), and a telescopic air passage mechanism (37). The left end of the outer cylinder (18) is fixedly connected to a third connecting flange (19). The center of the third connecting flange (19) has a through hole (20) that is adapted to the axial through cavity (5). The third connecting flange (19) is coaxially fixedly connected to the second connecting flange (7). Several key plates (21) are uniformly fixedly connected to the outer side of the left part of the outer cylinder (18) in a circumferential direction. Several key plates (27) are uniformly fixedly connected to the inner side of the left part in a circumferential direction. Several key plates (22) are uniformly fixedly connected to the inner side of the right part in a circumferential direction. The length direction of key plates (27) and key plates (22) extends axially. The number of key plates is the same and their positions correspond to each other. The left radial baffle (23) is set in the inner cavity of the outer cylinder (18) and is located on the left side of the left end of the multiple key plates (22). Its outer circular surface is fixedly connected to the inner wall of the outer cylinder (18). A through hole 2 (24) is opened at the axis of the left radial baffle (23), and an eccentric mounting hole 1 (25) is opened on the outside of the through hole 2 (24). The inner diameter of the through hole 2 (24) is smaller than the inner diameter of the through hole 1 (20), and the eccentric mounting hole 1 (25) is located on the outside of the through hole 1 (20). The inner cylinder (26) is coaxially inserted inside the outer cylinder (18) and located to the right of the left radial baffle (23). Multiple pairs of key plates (56) are uniformly fixedly connected to the outer circumferential surface of the left end of the inner cylinder (26). The multiple pairs of key plates (56) are correspondingly arranged with multiple key plates (22). When the inner cylinder (26) is in a fully retracted state, each pair of key plates (56) is located on the outer sides of a corresponding key plate (27). When the inner cylinder (26) is fully extended, each pair of key plates four (56) are located on the outer sides of a corresponding key plate three (22); an arc-shaped limiting plate is fixedly connected between the right ends of each pair of adjacent key plates three (22), the outer arc surface of the arc-shaped limiting plate is fixedly connected to the inner wall of the outer cylinder (18), and multiple arc-shaped limiting plates slide and seal with the outer circular surface of the inner cylinder (26), and are used to limit the right side of multiple key plates four (56); The right radial baffle (28) is located on the right side of the inner cavity of the inner cylinder (26). The outer diameter of the right radial baffle (28) is matched with the outer diameter of the inner cylinder (26), and the outer circular surface of the right radial baffle (28) is fixedly connected to the inner wall of the inner cylinder (26). The right radial baffle (28) has an eccentric mounting hole (29) at the position corresponding to the eccentric mounting hole one (25). The buffer air chamber (30) is cylindrical in shape. The buffer air chamber (30) is coaxially fixedly connected to the inside of the inner cylinder (26) and located on the right side of the right radial baffle (28). The left end plate (51) of the buffer air chamber (30) has an air supply mounting hole (3) at the position corresponding to the eccentric mounting hole two (29). 1) A connector mounting hole (32) is provided at the center of the right end plate (52); the inner connector (33) is coaxially disposed inside the right end of the inner cylinder (26), and the left end of the inner connector (33) is fixedly inserted into the connector mounting hole (32). The outer side of the middle part of the inner connector (33) is fixedly connected to the inner wall of the inner cylinder (26) through multiple annular connecting plates (36); an axially penetrating stepped cavity is provided at the center of the inner connector (33); the stepped cavity includes a connecting cavity (34) located at the left end of the inner connector (33) and a connector receiving cavity (35) located on the right side of the connecting cavity (34), wherein the inner diameter of the connecting cavity (34) is smaller than the inner diameter of the connector receiving cavity (35); The telescopic air passage mechanism (37) includes an outer tube (38), an inner tube (39), and an air inlet pipe (50); the outer tube (38) is fixedly connected to the inside of the inner cylinder (26) corresponding to the eccentric mounting hole two (29), the left end of the outer tube (38) is flush with the left end of the inner cylinder (26), and an air outlet connector (40) is installed inside the right end of the outer tube (38). The right end of the outer tube (38) is fixedly inserted into the eccentric mounting hole two (29), and the right end of the air outlet connector (40) is fixedly inserted into the air supply mounting hole (31); the inner tube (39) is coaxially arranged inside the outer tube (38), and a guide ring (41) is fixedly connected to the outside of its right end. The outer diameter of 41) is matched with the inner diameter of the outer tube (38) and slides and seals with the outer tube (38); the left part of the inner tube (39) is fixedly inserted into the eccentric mounting hole (25), and the left end of the inner tube (39) is fixedly connected to the left side of the left radial baffle (23) with an air inlet connector (42). The outer circular surface of the left end of the inner tube (39) is fixedly connected to the inner wall of the outer cylinder (18) through the radial connecting plate (43); the right end of the air inlet pipe (50) is fixedly connected to the air inlet connector (42), and the left end of the air inlet pipe (50) is connected to the two air inlet connectors (49) through the connecting pipe after passing through the third connecting flange (19) and the second connecting flange (7) in sequence.

2. The telescopic drill rod device for a down-the-hole hammer according to claim 1, characterized in that, It also includes a left annular cover (45) and a right annular cover (46). The left end of the left annular mounting groove (12) extends to the left end face of the rotating spindle (3), and the right end of the right annular mounting groove (13) extends to the right end face of the rotating spindle (3). The left annular cover (45) is rotatably fitted on the outside of the left side of the rotating spindle (3) and fixedly connected to the left end of the rotating bushing (4) to close the left opening end of the left annular mounting groove (12). The right annular cover (46) is rotatably fitted on the outside of the right side of the rotating spindle (3) and fixedly connected to the right end of the rotating bushing (4) to close the right opening end of the right annular mounting groove (13).

3. A telescopic drill rod device for a down-the-hole hammer according to claim 1 or 2, characterized in that, The upper left end and lower right end of the connector receiving cavity (35) are provided with two semi-circular inner pin grooves (44) spaced apart, and the inner pin grooves (44) extend in the front-back direction; on the inner cylinder (26) corresponding to the two inner pin grooves (44), two pairs of through grooves are provided, and each pair of through grooves is coaxially arranged with the corresponding inner pin groove (44) for the insertion or removal of the pin shaft.

4. A telescopic drill rod device for a down-the-hole hammer according to claim 3, characterized in that, An annular sealing groove (10) is provided in the middle of the inner circular surface of the left annular boss (54) and the right annular boss (55), and an annular sealing ring is installed in each annular sealing groove (10).

5. A telescopic drill rod device for a down-the-hole hammer according to claim 4, characterized in that, The internal connector (33) is an internal hexagonal connector.

6. A telescopic drill rod device for a down-the-hole hammer according to claim 5, characterized in that, The rotating spindle (3) and the second connecting flange (7) are an integral structure; the rotating spindle (3) and the first connecting flange (6) are connected by bolts.

7. A telescopic drill rod device for a down-the-hole hammer according to claim 6, characterized in that, The buffer air chamber (30) consists of a cylindrical body (53), a left end plate (51) fixedly encapsulated at the left opening end of the cylindrical body (53), and a right end plate (52) fixedly encapsulated at the right opening end of the cylindrical body (53).

8. A telescopic drill rod device for a down-the-hole hammer according to claim 7, characterized in that, The diameter of the second radial connecting hole (17) is smaller than the length of the annular groove (16) in the left-right direction; the diameter of the first radial connecting hole (9) is smaller than the diameter of the second radial connecting hole (17).

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