Floating damping joint and reverse circulation down-the-hole drill

Abstract

The application provides a floating damping joint and a reverse circulation down-the-hole drill, and belongs to the technical field of drills. The joint upper seat has a through hole arranged in the axial direction in the middle part. One end of the joint upper seat has a flow guiding space, and the end of the joint upper seat with the flow guiding space is used for being connected with a connecting pipeline. The plug is connected in the flow guiding space of the joint upper seat. One end of the plug abuts against the end of the connecting pipeline to block the residue discharging hole of the connecting pipeline. A gap is reserved between the outer peripheral wall of the plug and the inner peripheral wall of the flow guiding space, and the gap is communicated with the air passage of the connecting pipeline. An air passing passage is arranged on the plug, and the air passing passage is communicated with the gap and the through hole of the joint upper seat. The above-mentioned arrangement of the application can realize positive circulation operation without replacing the reverse circulation rotary power head with a positive circulation rotary power head, can reduce the modification difficulty, and shorten the modification time.

Description

Technical Field

[0001] This application belongs to the field of drilling rig technology, specifically relating to a floating shock-absorbing joint and a reverse circulation down-the-hole drilling rig. Background Technology

[0002] In open-pit mining, sampling is a crucial preliminary step in the development of subsequent mining plans. In conventional operations, it is usually necessary to use two different types of equipment, namely reverse circulation down-the-hole drills and forward circulation down-the-hole drills, to complete the entire process of sampling and subsequent mining.

[0003] The rotary power head of the reverse circulation down-the-hole drill has a slag discharge hole in the middle and an air passage inside the side wall of the connecting pipe. Therefore, the rotary power head of the reverse circulation down-the-hole drill is connected to the double-wall drill rod through the connecting pipe, which enables the air passage of the connecting pipe to communicate with the air passage inside the side wall of the double-wall drill rod, providing a passage for the reverse circulation airflow to carry slag and discharge chips, and facilitating reverse circulation sampling.

[0004] The positive circulation down-the-hole drill uses a regular drill rod. Pressurized gas is introduced into the center hole of the drill bit from the center hole of the drill rod. While drilling, the pressurized gas carries debris out from the gap between the outer wall of the drill rod and the inner wall of the borehole.

[0005] Therefore, the rotary power head of a forward circulation down-the-hole drill is fundamentally different from that of a reverse circulation down-the-hole drill and cannot be directly substituted.

[0006] In existing technologies, when sampling operations are completed and the subsequent mining process needs to begin, operators replace the reverse circulation rotary power head with a forward circulation rotary power head. However, the reverse circulation rotary power head needs to be connected to multiple pipelines such as gas lines and slag lines simultaneously, and the difficulty in allocating lifting equipment is common at open-pit mine construction sites. This makes the disassembly and replacement of the rotary power head difficult, time-consuming, and affects the overall progress of the mining operation. Summary of the Invention

[0007] This application provides a floating shock-absorbing joint and a reverse circulation down-the-hole drill, aiming to solve the problems of high difficulty and long modification time in replacing the rotary power head in the prior art.

[0008] To achieve the above objectives, the technical solution adopted in this application is as follows: A floating shock absorber joint is provided, comprising: The upper part of the connector has a through hole arranged axially in the middle; one end of the upper part of the connector has a flow guiding space, and the end of the upper part of the connector with the flow guiding space is used to connect to the connecting pipe. A plug is connected within the flow guiding space of the connector seat; one end of the plug abuts against the end of the connecting pipe to seal the slag discharge hole of the connecting pipe; a gap is reserved between the outer peripheral wall of the plug and the inner peripheral wall of the flow guiding space, and the gap is connected to the venting channel of the connecting pipe; the plug is provided with an air passage, which connects the gap and the through hole of the connector seat.

[0009] In one possible implementation, the connector has a stepped surface on the inner end of the flow guiding space, and the plug has a positioning ring that contacts the stepped surface; The connector seat has a retaining ring groove on the outside of the positioning ring, and the connector seat contacts the outside of the positioning ring through the retaining ring to axially limit the positioning ring.

[0010] In one possible implementation, the plug is inserted into the connecting pipe, and a sealing structure is provided between the outer peripheral wall of the plug and the inner peripheral wall of the connecting pipe.

[0011] In one possible implementation, the other end of the connector seat is connected to a shock-absorbing structure, and the other end of the shock-absorbing structure is used to connect to the drill pipe. The shock-absorbing structure has an air passage in the middle, which connects the central hole of the drill rod and the through hole of the upper joint seat; the shock-absorbing structure has a first shock-absorbing pad that contacts the end of the upper joint seat.

[0012] In one possible implementation, the damping structure includes: The lower connector seat is connected to the upper connector seat at one end, and the end of the lower connector seat has a through hole, which is aligned with the through hole of the upper connector seat; a spline groove is provided on the inner peripheral wall of the lower connector seat. The connector spline shaft slides with the spline groove; one end of the connector spline shaft is located outside the lower part of the connector and is used to connect with the drill rod; an air vent is provided on the connector spline shaft; The other end of the lower part of the connector is sealed to the splined shaft of the connector, and the first shock-absorbing pad is connected to the inner end of the splined shaft of the connector.

[0013] In one possible implementation, the lower part of the connector is provided with a positioning step, and a second shock-absorbing pad is connected to the positioning step; Wherein, the spline length of the connector spline shaft is less than the length of the connector spline shaft, the first damping pad is connected to one end of the spline, and the second damping pad can contact the other end of the spline.

[0014] In one possible implementation, the air passage in the spline shaft of the connector is provided with a floating tube, and the other end of the floating tube is located in the through hole of the upper seat of the connector. The floating through pipe is sealed to the splined shaft of the connector and the upper seat of the connector, and the floating through pipe is used to connect the vent hole and the through hole of the upper seat of the connector.

[0015] In one possible implementation, the outer peripheral wall of the lower connector has a lubrication hole that communicates with the outer peripheral wall of the connector spline shaft, and an oil cup is connected inside the lubrication hole of the lower connector.

[0016] In one possible implementation, the upper connector seat is splined to the lower connector seat and secured with bolts.

[0017] The floating shock absorber provided in this application, compared with the prior art, after the upper seat of the joint is connected to the connecting pipe of the reverse circulation rotary power head, the slag discharge hole of the connecting pipe can be blocked by the flow guiding space of the upper seat and the cooperation of the plug. The air passage of the connecting pipe is connected to the through hole of the upper seat, realizing the process of converting the side wall air passage of the connecting pipe into the center air passage of the upper seat. The above-mentioned setting of this application does not require the reverse circulation rotary power head to be replaced with the positive circulation rotary power head, so as to realize the positive circulation operation, which can reduce the difficulty of modification and shorten the modification time.

[0018] To achieve the above objectives, another technical solution adopted in this application is: A reverse circulation down-the-hole drill rig is provided, including the aforementioned floating shock-absorbing joint.

[0019] The beneficial effects of the reverse circulation down-the-hole drill provided in this application are the same as those of the floating shock absorber joint, and will not be repeated here. Attached Figure Description

[0020] Figure 1 A cross-sectional view of a floating shock-absorbing joint provided in an embodiment of this application; Figure 2 A schematic diagram illustrating the fit between a floating shock-absorbing joint and a connecting pipe, provided in an embodiment of this application; Figure 3 for Figure 2 Enlarged diagram of section A in the middle; Figure 4 for Figure 2 Enlarged diagram of section B in the middle; Figure 5 for Figure 2 Enlarged diagram of section C; Figure 6 This is an exploded view of a floating shock-absorbing joint provided in an embodiment of this application; Figure 7 for Figure 6 Enlarged schematic diagram of section D in the middle; Figure 8This is a schematic diagram of the upper seat and plug portion of a floating shock-absorbing joint provided in an embodiment of this application.

[0021] Explanation of reference numerals in the attached drawings: 1. Upper connector seat; 11. Flow guide space; 12. Connecting ring; 2. Plug; 21. Air passage; 22. Gap; 23. Blind groove; 24. Positioning ring; 25. Annular groove; 3. Connecting pipe; 31. Slag discharge hole; 32. Air passage; 4. Vibration damping structure; 41. Air passage hole; 42. First vibration damping pad; 43. Lower connector seat; 431. Spline groove; 432. Positioning step; 433. Lubrication cavity; 44. Connector spline shaft; 45. Second vibration damping pad; 5. Floating through pipe; 6. Oil cup. Detailed Implementation

[0022] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0023] Please refer to the following: Figures 1 to 8 The present application provides a description of a floating vibration damping joint. The floating vibration damping joint includes a joint upper seat 1 and a plug 2. The joint upper seat 1 has an axially oriented through hole in its middle. One end of the joint upper seat 1 has a flow guiding space 11, which is used to connect to a connecting pipe 3. The plug 2 is connected within the flow guiding space 11 of the joint upper seat 1. One end of the plug 2 abuts against the end of the connecting pipe 3 to seal the slag discharge hole 31 of the connecting pipe 3. A gap 22 is reserved between the outer peripheral wall of the plug 2 and the inner peripheral wall of the flow guiding space 11, and the gap 22 communicates with the ventilation channel 32 of the connecting pipe 3. The plug 2 is provided with an air passage 21, which connects the gap 22 and the through hole of the joint upper seat 1. The rotary power head and the connecting pipe 3 are existing technologies and will not be described in detail here.

[0024] The floating shock absorber provided in this application, compared with the prior art, after the upper seat 1 of the connector is connected to the connecting pipe 3 of the reverse circulation rotary power head, the slag discharge hole 31 of the connecting pipe 3 can be blocked by the cooperation of the guide space 11 of the upper seat 1 and the plug 2. The ventilation channel 32 of the connecting pipe 3 is connected to the through hole of the upper seat 1, realizing the process of converting the side wall ventilation mode of the connecting pipe 3 to the center ventilation mode of the upper seat 1. The above-mentioned setting of this application does not require the reverse circulation rotary power head to be replaced with the positive circulation rotary power head, so as to realize the positive circulation operation, which can reduce the difficulty of modification and shorten the modification time.

[0025] It should be noted that the floating vibration damping joint is not installed on the rotary power head of the reverse circulation down-the-hole drill rig during sampling operations. After sampling is completed, the floating vibration damping joint is installed on the rotary power head of the reverse circulation down-the-hole drill rig. This converts the side ventilation mode of the connecting pipe 3 of the rotary power head to the center ventilation mode of the joint seat 1, thereby converting the reverse circulation down-the-hole drill rig into a forward circulation drilling mode. This eliminates the need to disassemble the rotary power head, reducing the difficulty of the conversion and saving time.

[0026] When the upper seat 1 of the connector is installed on the connecting pipe 3 of the rotary connector, the plug 2 can block the slag discharge hole 31 of the connecting pipe 3. Therefore, the pressurized gas that enters the air passage 21 of the plug 2 from the side wall of the connecting pipe 3 will not enter the slag discharge hole 31 of the connecting pipe 3, reducing the occurrence of air leakage and ensuring the gas pressure entering the drill pipe.

[0027] The end of the plug 2 facing the upper seat 1 has a blind groove 23, and the air passage 21 is a through hole on the side wall of the plug 2, which communicates with the blind groove 23. When the plug 2 is installed between the upper seat 1 and the connecting pipe 3, the through hole on the outer wall of the plug 2 is located in the gap 22 of the flow guiding space 11, which communicates with the air passage 32 of the connecting pipe 3. Therefore, the air passage 32 of the connecting pipe 3 can communicate with the blind groove 23 of the plug 2, thereby making the air passage 32 communicate with the through hole of the upper seat 1.

[0028] In some embodiments, such as Figures 1 to 8 As shown, the upper connector 1 has a stepped surface at the inner end of the flow guiding space 11, and the plug 2 has a positioning ring 24 that contacts the stepped surface; wherein, the upper connector 1 has a retaining ring groove on the outer side of the positioning ring 24, and the upper connector 1 contacts the outer side of the positioning ring 24 through the retaining ring to axially limit the positioning ring 24.

[0029] Before installing the upper seat 1 of the connector onto the connecting pipe 3, the plug 2 is first installed inside the upper seat 1. Specifically, the positioning ring 24 on the plug 2 is brought into contact with the stepped surface inside the upper seat 1, and then the snap ring is snapped into the snap ring groove of the upper seat 1. At this time, the stepped surface and the snap ring are in contact with the two ends of the positioning ring 24 respectively, which can play the role of axial limiting of the plug 2.

[0030] In order to circumferentially limit the plug 2, the outer peripheral wall of the positioning ring 24 contacts the inner peripheral wall of the connector seat 1, thus reducing the radial displacement of the plug 2 and ensuring the position of the plug 2 relative to the connector seat 1.

[0031] Since the diameter of the positioning ring 24 is larger than the diameter of the plug 2, after the plug 2 is installed on the connector seat 1, a gap 22 is formed between the outer peripheral wall of the plug 2 and the inner peripheral wall of the flow guiding space 11, and the opening end of the ventilation channel 32 of the connecting pipe 3 is connected to the gap 22.

[0032] In some embodiments, such as Figures 1 to 8 As shown, the plug 2 is inserted into the connecting pipe 3, and a sealing structure is provided between the outer peripheral wall of the plug 2 and the inner peripheral wall of the connecting pipe 3.

[0033] It should be noted that the interior of the connecting pipe 3 has a stepped surface for limiting the end of the plug 2. After the plug 2 is inserted into the connecting pipe 3, the stepped surface inside the connecting pipe 3 can limit the end of the plug 2.

[0034] The plug 2 has an annular groove 25 on its outer peripheral wall, and the sealing structure includes a sealing ring, which is fitted inside the annular groove 25. After the plug 2 is inserted and fitted into the connecting pipe 3, the sealing ring abuts against the inner peripheral wall of the connecting pipe 3 to achieve a sealing effect and reduce the possibility of air leakage.

[0035] After the plug 2 is inserted into place, the through hole on the side wall of the plug 2 is located outside the connecting pipe 3, and the through hole will not be inserted into the connecting pipe 3, ensuring that the air passage 32 of the connecting pipe 3 is connected to the through hole in the upper seat 1 of the connector.

[0036] The connection between the upper connector 1 and the connecting pipe 3 is a threaded connection. Specifically, the outer circumferential wall of the connecting pipe 3 has external threads, and one end of the upper connector 1 with the plug 2 has internal threads. The upper connector 1 and the connecting pipe 3 are threadedly engaged. While the upper connector 1 and the connecting pipe 3 are threadedly engaged, the plug 2 is inserted into the connecting pipe 3 and sealed by a sealing ring.

[0037] In some embodiments, such as Figures 1 to 8 As shown, the other end of the connector seat 1 is connected to a shock-absorbing structure 4, and the other end of the shock-absorbing structure 4 is used to connect to the drill rod; wherein, the middle part of the shock-absorbing structure 4 has an air passage hole 41, which connects the center hole of the drill rod and the through hole of the connector seat 1; the shock-absorbing structure 4 has a first shock-absorbing pad 42 that contacts the end of the connector seat 1.

[0038] The air passage 41 in the middle of the shock-absorbing joint allows pressurized gas to pass through the shock-absorbing structure 4 without affecting the transmission process of the air path; by setting the first shock-absorbing pad 42, it can play a shock-absorbing and buffering role between the shock-absorbing joint and the upper seat 1 of the joint, reducing the axial impact force transmitted to the connecting pipe 3 and reducing the impact on the connecting pipe 3.

[0039] By connecting the upper seat 1 of the connector and the drill rod through the shock-absorbing joint, not only can pressurized gas be transmitted from the air passage 41 to the middle of the drill rod to achieve air passage connection, but it can also buffer axial impact during drilling operations and reduce damage to the rotary power head during drilling operations.

[0040] In some embodiments, such as Figures 1 to 8 As shown, the shock-absorbing structure 4 includes a lower connector seat 43 and a connector spline shaft 44; one end of the lower connector seat 43 is connected to the upper connector seat 1, and the end of the lower connector seat 43 has a through hole, which is aligned with the through hole of the upper connector seat 1; a spline groove 431 is provided on the inner peripheral wall of the lower connector seat 43; the connector spline shaft 44 is slidably engaged with the spline groove 431; one end of the connector spline shaft 44 is located outside the lower connector seat 43 and is used to connect with the drill rod; an air vent 41 is provided on the connector spline shaft 44; the other end of the lower connector seat 43 is sealed to the connector spline shaft 44, and the first shock-absorbing pad 42 is connected to the inner end of the connector spline shaft 44.

[0041] The upper connector 1 and the lower connector 43 are splined and fixed with bolts. Specifically, the lower connector 43 has a spline groove at its end, and the upper connector 1 has a spline at its end. The upper connector 1 and the lower connector 43 are engaged by spline insertion. A connecting ring 12 is fixed on the outer peripheral wall of the upper connector 1, and the connecting ring 12 has several through holes. The lower connector 43 has threaded holes at its end that are aligned with the through holes on the connecting ring 12.

[0042] After the upper connector 1 and lower connector 43 are splined together, the connecting ring 12 contacts the end of the lower connector 43, and the through hole on the connecting ring 12 is aligned with the threaded hole of the lower connector 43. At this time, the threaded end of the bolt is passed through the through hole of the connecting ring 12 and threadedly engaged with the threaded hole of the lower connector 43, which can fix the lower connector 43 onto the upper connector 1. A sealing ring is provided between the ends of the connecting ring 12 and the lower connector 43 to ensure sealing performance.

[0043] It should be noted that the spline length of the connector spline shaft 44 is less than the length of the connector spline shaft 44 itself; therefore, the spline on the connector spline shaft 44 occupies only a portion of the connector spline shaft 44. The portion of the connector spline shaft 44 without splines protrudes through the connector lower seat 43, and this portion is in a sealing fit with the connector lower seat 43. This arrangement reduces the likelihood of air leakage between the connector spline shaft 44 and the connector lower seat 43.

[0044] The spline shaft 44 of the connector can slide within the lower seat 43 of the connector. By setting a first damping pad 42 between the inner end of the spline shaft 44 of the connector and the upper seat 1 of the connector, the first damping pad 42 can buffer axial impact and protect the rotating power head.

[0045] For example, the first damping pad 42 can be fixed to the splined shaft 44 of the connector, or it can be fixed to the end of the upper seat 1 of the connector. The first damping pad 42 can also slide freely between the inner end of the splined shaft 44 and the end of the upper seat 1 of the connector. Regardless of the connection method, as long as the first damping pad 42 is placed between the splined shaft 44 and the upper seat 1 of the connector, it can provide axial cushioning.

[0046] In order to axially limit the spline shaft 44 of the connector, a positioning step 432 is provided in the lower seat 43 of the connector. The positioning step 432 can contact the end of the spline on the spline shaft 44 of the connector to prevent the spline shaft 44 of the connector from falling out of the lower seat 43 of the connector.

[0047] For example, a second damping pad 45 is provided on the positioning step 432, and the second damping pad 45 can contact the end of the spline; when the drill rod is lifted upward, the second damping pad 45 contacts the end of the spline of the joint spline shaft 44, thereby playing a buffering role.

[0048] The splined shaft 44 of the connector has an axially penetrating hole inside, which is a vent hole 41. Before installing the lower connector seat 43 onto the upper connector seat 1, the splined shaft 44 is placed inside the lower connector seat 43, and then the lower connector seat 43 is fixed to the upper connector seat 1. Through the above arrangement, the splined shaft 44 can be limited inside the lower connector seat 43, and one end of the splined shaft 44 can pass through the lower connector seat 43 and engage with the drill pipe thread.

[0049] By using the splined engagement between the upper connector 1 and the lower connector 43, and the splined engagement between the connector spline shaft 44 and the internal spline of the lower connector 43, the stability of circumferential torque transmission can be improved, ensuring smooth rotation of the drill rod and facilitating drilling operations.

[0050] In some embodiments, such as Figures 1 to 8 As shown, the air passage 41 inside the spline shaft 44 of the connector is provided with a floating tube 5, and the other end of the floating tube 5 is located in the through hole of the upper seat 1 of the connector; wherein, the floating tube 5 is sealed to the spline shaft 44 of the connector and the upper seat 1 of the connector, and the floating tube 5 is used to connect the air passage 41 and the through hole of the upper seat 1 of the connector.

[0051] To improve the sealing performance between the splined shaft 44 and the upper seat 1 of the connector and reduce air leakage from the spline groove 431 inside the lower seat 43 of the connector, a floating pipe 5 is installed in the air hole 41 of the splined shaft 44 of the connector. The floating pipe 5 connects the air hole 41 of the splined shaft 44 of the connector and the through hole of the upper seat 1 of the connector. The floating pipe 5 is in a sealing fit with the splined shaft 44 of the connector and the upper seat 1 of the connector, which can reduce the pressure gas leaking into the spline groove 431 of the lower seat 43 of the connector and reduce the occurrence of air leakage.

[0052] The air passage 41 inside the splined shaft 44 of the connector has a stepped surface. The stepped surface contacts the end of the floating tube 5, which can limit the position of the floating tube 5 inside the splined shaft 44 of the connector and prevent the floating tube 5 from sliding out of the splined shaft 44 of the connector.

[0053] The other end of the floating pipe 5 can contact the end of the plug 2, which can limit the other end of the floating pipe 5, ensure the connection between the floating pipe 5 and the upper seat 1 and the spline shaft 44 of the connector, and reduce the pressure gas leaking into the spline groove 431 of the lower seat 43 of the connector.

[0054] Both the inner circumferential wall of the vent hole 41 of the connector spline shaft 44 and the inner circumferential wall of the connector upper seat 1 are provided with annular grooves 25. A sealing ring is provided in the annular groove 25, and the sealing ring is in sealing fit with the floating pipe 5. Through the above arrangement, the sealing performance between the floating pipe 5 and the connector spline shaft 44 and the connector upper seat 1 is guaranteed, so that the pressurized gas in the connector upper seat 1 can directly enter the vent hole 41 of the connector spline shaft 44 after floating through.

[0055] It should be noted that regardless of the position to which the spline shaft 44 slides within the lower connector seat 43, the floating tube 5 connects the vent 41 and the through hole of the upper connector seat 1. Taking the first damping pad 42 fixed to the spline shaft 44 as an example, when the spline of the spline shaft 44 contacts the second damping pad 45, the distance between the first damping pad 42 and the upper connector seat 1 is the maximum sliding distance. The distance between the end of the floating tube 5 within the upper connector seat 1 and the plug 2 is greater than the maximum sliding distance. Therefore, the floating tube 5 will not affect the return sliding of the spline shaft 44. When the first damping pad 42 contacts the upper connector seat 1, there is a gap between the end of the floating tube 5 and the plug 2.

[0056] For example, the floating tube 5 has an external thread on its outer peripheral wall near the stepped surface of the vent hole 41, and an internal thread at the corresponding position of the vent hole 41. The floating tube 5 is threadedly engaged with the splined shaft 44 of the connector, and the floating tube 5 can slide along with the splined shaft 44 of the connector. The threaded engagement position between the floating tube 5 and the splined shaft 44 of the connector is smaller than the position of the annular groove 25 inside the splined shaft 44 of the connector. Therefore, the sealing engagement position of the annular groove 25 is a smooth surface, which can ensure a seal.

[0057] In some embodiments, such as Figures 1 to 8 As shown, the lower part of the connector 43 has a lubrication hole on its outer peripheral wall that communicates with the outer peripheral wall of the connector spline shaft 44. An oil cup 6 is connected inside the lubrication hole of the lower part of the connector 43. The oil cup 6 is a lubricating oil connector. The oil cup 6 is existing technology and will not be described in detail here.

[0058] A lubrication cavity 433 is provided between the end of the lower connector 43 and the second damping pad 45. The lubrication hole is a threaded hole and communicates with the lubrication cavity 433. A threaded hole is also provided on the lower connector 43 at the position of the spline groove 431 near the second damping pad 45. This threaded hole is also a lubrication hole. The oil cup 6 is threadedly engaged with the threaded hole of the lower connector 43, which can inject lubricating oil into the spline groove 431 and the lubrication cavity 433 to ensure the lubrication effect.

[0059] The oil cup 6 and the lower connector 43 are sealed together at the threaded connection position to reduce oil leakage. The floating pipe 5 set between the splined shaft 44 and the upper connector 1 can also isolate the lubricating oil, reducing the possibility of lubricating oil leaking into the splined shaft 44 and the upper connector 1.

[0060] Therefore, the floating conduit 5 can not only isolate the lubricating oil, but also isolate the pressurized gas, thus separating the air path and the lubrication path so that they do not affect each other.

[0061] Based on the same inventive concept, this application also provides a reverse circulation down-the-hole drill, including the above-mentioned floating shock-absorbing joint; the reverse circulation down-the-hole drill adopts the above-mentioned floating shock-absorbing joint, which can convert the reverse circulation rotary power head into a positive circulation working mode without disassembling the rotary power head, thus shortening the conversion time.

[0062] After sampling is completed using a reverse circulation down-the-hole drill, the double-walled drill rod is removed, and the floating shock absorber is installed on the connecting pipe 3 of the rotary power head. A regular drill rod is then connected to the shock absorber to continue the forward circulation mining operation.

[0063] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A floating shock-absorbing joint, applied to a reverse circulation down-the-hole drill rig, characterized in that, include: The upper part of the connector has a through hole arranged axially in the middle; one end of the upper part of the connector has a flow guiding space, and the end of the upper part of the connector with the flow guiding space is used to connect to the connecting pipe. A plug is connected within the flow guiding space of the connector seat; one end of the plug abuts against the end of the connecting pipe to seal the slag discharge hole of the connecting pipe; a gap is reserved between the outer peripheral wall of the plug and the inner peripheral wall of the flow guiding space, and the gap is connected to the venting channel of the connecting pipe; the plug is provided with an air passage, which connects the gap and the through hole of the connector seat. The plug is inserted into the connecting pipe, and a sealing structure is provided between the outer peripheral wall of the plug and the inner peripheral wall of the connecting pipe; The other end of the connector upper seat is connected to a shock-absorbing structure, and the other end of the shock-absorbing structure is used to connect to the drill pipe. The shock-absorbing structure has an air vent in the middle, which connects the central hole of the drill rod and the through hole of the connector seat; the shock-absorbing structure has a first shock-absorbing pad that contacts the end of the connector seat. The end of the plug facing the upper part of the connector has a blind groove, and the air passage is a through hole on the side wall of the plug, which communicates with the blind groove; when the plug is installed between the upper part of the connector and the connecting pipe, the through hole on the outer side wall of the plug is located in the gap of the flow guiding space, and the gap of the flow guiding space communicates with the air passage of the connecting pipe. The floating shock-absorbing joint is installed on the rotary power head of the reverse circulation down-the-hole drill, which can convert the side ventilation mode of the connecting pipe of the rotary power head into the center ventilation mode of the joint seat, thereby converting the reverse circulation down-the-hole drill into a positive circulation drilling mode.

2. A floating shock-absorbing joint as described in claim 1, characterized in that, The connector has a stepped surface on the inner end of the flow guiding space, and the plug has a positioning ring that contacts the stepped surface; The connector seat has a retaining ring groove on the outside of the positioning ring, and the connector seat contacts the outside of the positioning ring through the retaining ring to axially limit the positioning ring.

3. A floating shock-absorbing joint as described in claim 1, characterized in that, The damping structure includes: The lower connector seat is connected to the upper connector seat at one end, and the end of the lower connector seat has a through hole, which is aligned with the through hole of the upper connector seat; a spline groove is provided on the inner peripheral wall of the lower connector seat. The connector spline shaft slides with the spline groove; one end of the connector spline shaft is located outside the lower part of the connector and is used to connect with the drill rod; an air vent is provided on the connector spline shaft; The other end of the lower part of the connector is sealed to the splined shaft of the connector, and the first shock-absorbing pad is connected to the inner end of the splined shaft of the connector.

4. A floating shock-absorbing joint as described in claim 3, characterized in that, The lower part of the connector is provided with a positioning step, and a second shock-absorbing pad is connected to the positioning step; Wherein, the spline length of the connector spline shaft is less than the length of the connector spline shaft, the first damping pad is connected to one end of the spline, and the second damping pad can contact the other end of the spline.

5. A floating shock-absorbing joint as described in claim 3, characterized in that, The air passage in the splined shaft of the connector is equipped with a floating tube, and the other end of the floating tube is located in the through hole of the upper seat of the connector. The floating through pipe is sealed to the splined shaft of the connector and the upper seat of the connector, and the floating through pipe is used to connect the vent hole and the through hole of the upper seat of the connector.

6. A floating shock-absorbing joint as described in claim 3, characterized in that, The lower part of the connector has a lubrication hole on its outer peripheral wall that communicates with the outer peripheral wall of the connector spline shaft, and an oil cup is connected inside the lubrication hole of the lower part of the connector.

7. A floating shock-absorbing joint as described in claim 3, characterized in that, The upper connector seat and the lower connector seat are splined and fixed with bolts.

8. A reverse circulation down-the-hole drill, characterized in that, Including the floating shock absorber joint as described in any one of claims 1-7.

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