A rear-mounted drill rod loading and unloading rig and a method for loading, retracting and dismounting drill rods

Abstract

A rear-mounted drill rod loading and unloading rig and a method for loading, unloading and disassembling drill rods, comprising a support rod base, a sliding rod base arranged on the support rod base, a sliding base slidingly arranged on the sliding rod base, a hydraulic oil cylinder arranged at one end of the sliding rod base for pushing the sliding base to slide, and a rotary driver arranged on the sliding base, wherein the rotary driver is filled with a drill rod, and the rotary driver comprises a base and a driving box arranged on the base, one side of the driving box is provided with a driving motor, an output shaft of the driving motor is connected with a driving gear after being arranged in the driving box, a drill rod assembly hole is arranged on the driving box adjacent to the driving motor, a rotary assembly for driving the drill rod to rotate is arranged in the drill rod assembly hole, and the rotary assembly is in meshing transmission connection with the driving gear. The drill rod can be directly taken out from the driver and loaded and unloaded in a safe area at the rear of the driving motor, thereby solving the safety hidden trouble problem of the current drill rod loading and unloading.

Description

Technical Field

[0001] This invention relates to the field of coal mine equipment technology, specifically to a rear-mounted drill rod loading and unloading drill rig and a method for loading, unloading and disassembling drill rods. Background Technology

[0002] The construction of high-outburst fully mechanized longwall faces in underground coal mines is a key aspect of integrated underground mining, mainly including the construction of gas drainage boreholes, verification boreholes, water injection boreholes, and pressure relief boreholes. Currently, our company's ZDY120S shallow-hole drilling rig is primarily used for drilling. Figure 7 As shown, this type of drilling rig requires its body to be fixed to the coal retaining plate of the face conveyor during construction. Powered by an emulsion pump station, it operates fully hydraulically and can easily complete shallow-hole gas release processes in high-outburst fully mechanized mining faces, as well as shallow-hole construction processes such as pressure relief holes and water injection holes. In underground coal mine construction, safety is always paramount; the operation of any equipment underground must be guaranteed by sufficient safety measures. Currently, the core problem with this type of drilling rig during underground construction is that it poses significant safety hazards. Specifically, due to… Figure 7 It is also evident that this type of drilling rig generally employs a direct drive structure for the motor and drill rod, with the drill rod and motor located on the same central axis. This forces frontline workers to stand in front of the motor when loading and unloading drill rods. The space between the front of the motor and the coal seam face is already limited, and this area is very close to the coal seam wall and borehole, constantly facing the risk of gas, water, and coal dust erupting from the borehole, posing a significant safety hazard. Therefore, frontline workers are constantly exposed to this area when loading and unloading drill rods, their personal safety under constant threat. In practical construction, it is observed that workers are extremely cautious when loading and unloading drill rods in this area, and even skilled workers experience a constant sense of tension. This makes loading and unloading drill rods with this type of drilling rig very inconvenient and does not meet the safety requirements for underground coal mine construction. Summary of the Invention

[0003] To address the aforementioned problems, the present invention aims to propose a rear-mounted drill rod loading and unloading rig and a method for loading, unloading, and disassembling drill rods. The main improvement lies in the redesign and optimization of the drill rod drive structure. The drill rod and drive motor are no longer located on the same central axis. The drill rod located on one side of the drive motor can freely pass through the rotary drive. The drill rod can be directly removed from the drive and loaded / unloaded from the drive in a safe area behind the drive motor, thus solving the existing safety hazards associated with drill rod loading and unloading.

[0004] The technical solution adopted by the present invention to solve the above problems is as follows:

[0005] A rear-mounted drill rod loading and unloading drilling rig includes a support rod seat, a slide rod seat mounted on the support rod seat, a slide block slidably mounted on the slide rod seat, a hydraulic cylinder mounted at one end of the slide rod seat for pushing the slide block to slide, and a rotary drive mounted on the slide block. The rotary drive is filled with drill rods. The rotary drive includes a base and a drive box mounted on the base. A drive motor is mounted on one side of the drive box. The output shaft of the drive motor is inserted into the drive box and connected to a drive gear. A drill rod assembly hole is provided on the drive box adjacent to the drive motor. A rotary assembly for driving the drill rod to rotate is provided in the drill rod assembly hole. The rotary assembly is meshed and transmitted with the drive gear.

[0006] As a preferred embodiment of the above technical solution, the rotary assembly includes a bearing, a rotary outer sleeve, a transmission inner sleeve, and an end cap. The bearing is disposed in the drill rod assembly hole, the rotary outer sleeve is disposed on the bearing, the rotary outer sleeve and the transmission inner sleeve are connected in a transmission sleeve, and the end cap is detachably assembled at the end of the rotary outer sleeve.

[0007] As a preferred embodiment of the above technical solution, an external gear ring is fitted on the outer circumference of the rotating outer sleeve, and the external gear ring meshes with the drive gear for transmission.

[0008] As a preferred embodiment of the above technical solution, the inner circumference of the rotating outer sleeve is a hexagonal structure that can transmit torque, the outer circumference of the transmission inner sleeve is a hexagonal structure that matches the rotating outer sleeve, and the inner circumference is a square structure that matches the female head of the drill pipe, and the inner diameter of the transmission inner sleeve matches the female head of the drill pipe.

[0009] As a preferred embodiment of the above technical solution, the end of the rotating outer sleeve is provided with an L-shaped clamping plate, and the outer circumference of the end cap is provided with an ear plate that can be rotatably engaged with the clamping plate. The end cap is rotatably engaged with the end of the rotating outer sleeve through the ear plate.

[0010] As a preferred embodiment of the above technical solution, the support rod base includes two lifting support rods located at both ends.

[0011] As a preferred embodiment of the above technical solution, the lifting support rod includes two support rods that are nested together and a limiting pin. A plurality of limiting holes matching the limiting pin are provided between the two support rods. The height of the two support rods is adjusted and fixed by the limiting pin passing through the limiting holes.

[0012] As a preferred embodiment of the above technical solution, the slide bar seat includes two parallel slide bars and a connecting plate disposed between the two ends of the two slide bars, and the bottom of the connecting plate is detachably mounted on the support rod seat.

[0013] As a preferred embodiment of the above technical solution, a connecting seat for fixing the hydraulic cylinder is provided at one end of the slide rod seat.

[0014] As a preferred embodiment of the above technical solution, a fixing plate for connecting and assembling the drilling rig base is provided near the tail end of the slide block seat.

[0015] A method for loading drill rods in a rear-mounted drill rod loading and unloading drill rig includes the following steps: First, start the drill rig to drill the first drill rod into the borehole, at which time the rotary drive is pushed to the position close to the head of the drill rig.

[0016] Second, remove the end cap, start the hydraulic cylinder to push the rotary drive forward further until the female head of the first drill rod passes through the rotary drive, and then remove the transmission inner sleeve that is still fitted on the female head.

[0017] Third, take the second drill pipe and connect its male end to the female end of the first drill pipe;

[0018] Fourth, start the hydraulic cylinder to pull the rotary drive back to the female end of the second drill rod. Then, put the removed transmission inner sleeve back onto the female end of the second drill rod and pull the rotary drive back again until the transmission inner sleeve is fully inserted into the rotary outer sleeve. At this time, the rotary drive is pulled back to near the tail end of the drilling rig.

[0019] Fifth, rotate the end cap into the rotary drive to complete one loading of the drill pipe; sixth, repeat the above steps until the drilling pipe loading is complete.

[0020] A method for removing and disassembling drill rods in a rear-mounted drill rod loading and unloading drilling rig includes the following steps: First, start the drilling rig, push the rotary drive to the front end of the drilling rig, then remove the end cover, start the hydraulic cylinder to push the rotary drive forward further, until the female head of the drill rod and part of the drill rod body at the end of the drill rod pass through the rotary drive.

[0021] Second, use a sleeve tool to fit and temporarily fix it to the drill rod at the end. The outer diameter of the end of the sleeve tool facing the rotary drive is larger than the outer diameter of the drill rod assembly hole, so that the sleeve tool can be supported against the end side of the rotary drive.

[0022] The casing fixture includes a pipe body with an inner diameter larger than the outer diameter of the drill pipe and a flange at one end of the pipe body. The outer diameter of the flange is larger than the outer diameter of the drill pipe assembly hole. Both the pipe body and the drill pipe have pin holes on their female ends. The pipe body is temporarily fixed to the drill pipe by a fixing pin.

[0023] Third, start the hydraulic cylinder to pull back the rotary drive. At this time, the rotary drive pushes the casing fixture against its end side. The casing fixture pulls back the drill rod at the end that is temporarily fixed to it. The drill rod at the end and the connection end of the second drill rod are completely pulled out of the borehole and enter the stroke of the slide.

[0024] Fourth, remove the casing fixture and detach the male end of the drill pipe from the female end of the secondary drill pipe; Fifth, start the hydraulic cylinder to push the rotary drive forward to the female end of the secondary drill pipe until the female end of the secondary drill pipe passes through the rotary drive, thus completing one drill pipe retraction and disassembly; Sixth, repeat the above steps until the drill pipe retraction and disassembly are completed.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] This application primarily redesigns and optimizes the drive structure of the drill pipe, namely the rotary drive. The original structure of the drive motor directly driving the drill pipe is improved to a gear transmission drive, so that the drill pipe and the drive motor are no longer located on the same central axis. At the same time, the transmission structure of the drill pipe adopts multiple interlocking transmission sleeves, which can be freely disassembled and assembled. The drill pipe located on the side of the drive motor can then freely pass in and out of the rotary drive. Thus, when loading and unloading the drill pipe, workers can directly remove and unload the drill pipe from the drive in a safe area behind the drive motor, without having to be exposed in an unsafe area, thereby solving the existing safety hazards in the loading and unloading of drill pipes. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of the present invention;

[0028] Figure 2 This is a schematic diagram of the assembly structure of the rotary drive and rotary assembly;

[0029] Figure 3 This is a schematic diagram of the assembly structure of a hydraulic cylinder;

[0030] Figure 4 This is a schematic diagram of the transmission inner sleeve.

[0031] Figure 5 This is a schematic diagram of the rotating outer casing;

[0032] Figure 6 A schematic diagram of the structure for disassembling and retracting the drill pipe;

[0033] Figure 7 This is a schematic diagram of the ZDY120S drilling rig in the prior art.

[0034] The markings in the diagram are: 1. Support rod seat, 2. Slide rod seat, 21. Connecting plate, 22. Connecting seat, 23. Fixing plate, 3. Slide rod seat, 4. Hydraulic cylinder, 5. Rotary drive, 51. Base, 52. Drive box, 53. Drive motor, 54. Drill rod assembly hole, 6. Rotary outer sleeve, 61. Clamping plate, 7. Transmission inner sleeve, 8. End cover, 81. Ear plate, 9. External gear ring, 10. Limit pin, 11. Limit hole, 12. Drill rod, 13. Casing fixture, 14. Fixing pin. Detailed Implementation

[0035] The present invention will now be described in detail with reference to specific embodiments. These embodiments are based on the technical solutions of the present invention and provide detailed implementation methods and specific operation processes.

[0036] First, the structural design of the drilling rig of the present invention is described in detail below:

[0037] As shown in the figure, the present invention provides a rear-mounted drill rod loading and unloading drilling machine, including a support rod seat 1, a slide rod seat 2 disposed on the support rod seat 1, a slide block 3 slidably disposed on the slide rod seat 2, a hydraulic cylinder 4 disposed at one end of the slide rod seat 2 for pushing the slide block 3 to slide, and a rotary drive 5 disposed on the slide block 3. The rotary drive 5 is filled with a drill rod 12. The rotary drive 5 includes a base 51 and a drive box 52 disposed on the base 51. A drive motor 53 is disposed on one side of the drive box 52. The output shaft of the drive motor 53 is inserted into the drive box 52 and connected to a drive gear. A drill rod assembly hole 54 is disposed on the drive box 52 adjacent to the drive motor 53. A rotary assembly for driving the drill rod 12 to rotate is disposed in the drill rod assembly hole 54. The rotary assembly is meshed and connected to the drive gear.

[0038] In this embodiment, the rotary assembly includes a bearing, a rotary outer sleeve 6, a transmission inner sleeve 7, and an end cap 8. The bearing is disposed within the drill rod assembly hole 54, and the rotary outer sleeve 6 is disposed on the bearing, allowing the rotary outer sleeve 6 to rotate freely within the bearing. The rotary outer sleeve 6 and the transmission inner sleeve 7 are connected by a transmission sleeve. Specifically, the inner circumference of the rotary outer sleeve 6 is a hexagonal structure capable of transmitting torque, the outer circumference of the transmission inner sleeve 7 is a hexagonal structure matching the rotary outer sleeve 6, and the inner circumference is a square structure matching the female head of the drill rod 12. The transmission inner sleeve 7 is directly and seamlessly fitted into the rotary outer sleeve 6 and can be freely disassembled and assembled. The inner diameter of the transmission inner sleeve 7 matches the female head of the drill rod 12, and the drill rod 12 is directly fitted into the transmission inner sleeve 7 through the square structure of its female head, thus forming a continuous torque transmission structure. The end cap 8 is detachably assembled at the end of the rotary outer sleeve 6 to prevent and limit the drill rod 12 from passing through the transmission inner sleeve 7.

[0039] In addition, an external gear ring 9 is fitted on the outer circumference of the rotating outer sleeve 6. The external gear ring 9 meshes with the drive teeth for transmission, and the drive motor 53 can directly drive the rotating outer sleeve 6 to rotate through the external gear ring 9.

[0040] The rotary transmission structure is mainly achieved by two transmission sleeves, namely the rotary outer sleeve 6 and the transmission inner sleeve 7. The rotary outer sleeve 6 is directly driven by the drive motor 53. At the same time, the rotary outer sleeve 6 further drives the transmission inner sleeve 7 to rotate through its hexagonal structure. The transmission inner sleeve 7 then further drives the drill rod 12 to rotate through its square structure, thus ultimately realizing the rotary drive of the drill rod.

[0041] On the one hand, the rotary drive structure provides a safe structural basis for the loading and unloading of drill rods. Specifically, the bearing and rotary sleeve 6 inside the drill rod mounting hole 54 are relatively fixed in the assembly structure and are generally not easily disassembled in use. However, the transmission inner sleeve 7 is different. It can freely pass through the rotary sleeve 6 along with the drill rod 12. The prerequisite is that the end cap at the end of the rotary sleeve 6 can be rotated off. In this way, when it is necessary to load or unload the drill rod, it is only necessary to rotate off the end cap 8 beforehand and push the drill rod 12 from one side to push the drill rod 12 and the transmission inner sleeve 7 out of the rotary sleeve 6 together. After removing the transmission inner sleeve 7, the loading and unloading of the drill rod can be carried out relatively safely behind the drive motor 53.

[0042] On the other hand, in addition to the above-mentioned functions, the rotary drive structure also indirectly protects the drive motor 53. Specifically, the drive motor 53 is no longer directly connected to the drive drill rod 12. Even if the drill rod 12 encounters jamming or stuck drill, the torque load will not be directly transmitted to the drive motor 53, thus providing a protective effect for the drive motor 53.

[0043] As for the disassembly and assembly structure of end cap 8, from Figure 2 As can be seen intuitively, the end of the rotating outer sleeve 6 is provided with an L-shaped clamping plate 61, and the outer circumference of the end cover 8 is provided with an ear plate 81 that can be rotatably engaged with the clamping plate 61. The end cover 8 is rotatably engaged with the end of the rotating outer sleeve 6 through the ear plate 81. When loading and unloading, it is only necessary to rotate the end cover 8 to remove it from the clamping plate 61.

[0044] In this embodiment, the support rod base 1 includes two lifting support rods located at the beginning and end. Each lifting support rod includes two support rods that are sleeved together and a limiting pin 10. A plurality of limiting holes 11 that match the limiting pin 10 are provided between the two support rods. The height of the two support rods is adjusted and fixed by the limiting pin 10 passing through the limiting hole 11.

[0045] In this embodiment, the slide bar seat 2 includes two parallel slide bars and a connecting plate 21 respectively disposed between the two ends of the two slide bars. The bottom of the connecting plate 21 is detachably mounted on the support rod seat 1.

[0046] In this embodiment, a connecting seat 22 for fixing the hydraulic cylinder 4 is provided at one end of the slide block 2. The connecting seat 22 also adopts a sliding connection structure. Unlike the slide block 3, the connecting seat 22 has an additional locking bolt. Generally, once the position of the connecting seat 22 is fixed, it will not change.

[0047] In this embodiment, a fixing plate 23 for connecting and assembling the drilling rig base is provided near the tail end of the slide rod seat 2. The fixing plate 23 is mainly used in conjunction with an assembly base that is matched with the drilling rig in the use state. The fixing plate 23 can be directly placed on the assembly base and fixed.

[0048] Secondly, the drill rod loading method of the drilling rig of the present invention is described as follows:

[0049] A method for loading drill rods into a rear-mounted drill rod loading and unloading drill rig includes the following steps:

[0050] First, start the drilling rig and drill the first drill rod 12 into the borehole. At this time, the rotary drive 5 is pushed to the front end of the drilling rig.

[0051] Second, remove the end cap 8, start the hydraulic cylinder 4 to push the rotary drive 5 further forward until the female head of the first drill rod 12 passes through the rotary drive 5, and at this time remove the transmission inner sleeve 7 that is still fitted on the female head.

[0052] Third, take the second drill rod 12 and connect its male end to the female end of the first drill rod 12;

[0053] Fourth, start the hydraulic cylinder 4 to pull the rotary drive 5 back to the female head of the second drill rod 12, and then put the removed transmission inner sleeve 7 back onto the female head of the second drill rod 12. Then pull the rotary drive 5 back again until the transmission inner sleeve 7 is fully inserted into the rotary outer sleeve 6. At this time, the rotary drive 5 is pulled back to near the tail end of the drilling rig.

[0054] Fifth, rotate the end cap 8 and insert it into the rotary drive 5 to complete one loading of the drill rod 12;

[0055] Sixth, repeat the above steps until the drill pipe is loaded.

[0056] Finally, the method for disassembling and retracting the drill rod of the drilling rig of the present invention is described as follows:

[0057] A method for removing and disassembling drill rods in a rear-mounted drill rod loading and unloading drilling rig includes the following steps:

[0058] First, start the drilling rig, push the rotary drive 5 to the front end of the drilling rig, then remove the end cover 8, start the hydraulic cylinder 4 to push the rotary drive 5 forward further, until the female head of the drill rod 12 at the end and part of the drill rod body pass through the rotary drive 5.

[0059] Second, a sleeve fixture 13 is used to fit and temporarily fix it to the drill rod 12 at the end. The outer diameter of the end of the sleeve fixture 13 facing the rotary drive 5 is larger than the outer diameter of the drill rod mounting hole 54, so that the sleeve fixture 13 can be supported against the end side of the rotary drive 5.

[0060] Among them, such as Figure 6 As shown, the casing fixture 13 includes a pipe body with an inner diameter larger than the outer diameter of the drill rod 12 and a flange disposed at one end of the pipe body. The outer diameter of the flange is larger than the outer diameter of the drill rod assembly hole 54. Both the pipe body and the female end of the drill rod are provided with pin holes. The pipe body is temporarily fixed to the drill rod 12 by a fixing pin 14.

[0061] Third, start the hydraulic cylinder 4 to pull back the rotary drive 5. At this time, the rotary drive 5 pushes the casing fixture 13 against its end side. The casing fixture 13 drives the drill rod 12, which is temporarily fixed to it, to pull back until the end of the drill rod 12 and the connection end of the secondary drill rod 12 are completely pulled out of the borehole and enter the stroke of the slide block 3.

[0062] Fourth, remove the casing fixture 13 and detach the male end of the drill pipe 12 from the female end of the secondary drill pipe 12.

[0063] Fifth, start the hydraulic cylinder 4 to push the rotary drive 5 forward to the female end of the second drill rod 12, until the female end of the second drill rod 12 passes through the rotary drive 5, thus completing one drill rod retraction and disassembly.

[0064] Sixth, repeat the above steps until the drill pipe is completely removed and disassembled.

[0065] The drilling rig involved in this application has been put into trial use on a small scale with excellent results. It has great practical value and has brought great convenience to the construction and production process. It meets the requirements of safe production in coal mines and has been well received by front-line workers underground.

[0066] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been described above with reference to preferred embodiments, it is not intended to limit the present invention. Any modifications or alterations made by those skilled in the art without departing from the scope of the present invention are equivalent embodiments. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention are still within the scope of the present invention.

Claims

1. A rear-mounted drill rod loading and unloading drilling rig, characterized in that: The device includes a support rod seat (1), a slide rod seat (2) disposed on the support rod seat (1), a slide block (3) slidably disposed on the slide rod seat (2), a hydraulic cylinder (4) disposed at one end of the slide rod seat (2) for pushing the slide block (3) to slide, and a rotary drive (5) disposed on the slide block (3). The rotary drive (5) is filled with a drill rod (12). The rotary drive (5) includes a base (51) and a drive box (52) disposed on the base (51). A drive motor (53) is disposed on one side of the drive box (52). The output shaft of the drive motor (53) is inserted into the drive box (52) and connected to a drive tooth. A drill rod assembly hole (54) is disposed on the drive box (52) adjacent to the drive motor (53). A rotary assembly for driving the drill rod (12) to rotate is disposed in the drill rod assembly hole (54). The rotary assembly is meshed and connected to the drive tooth. The rotary assembly includes a bearing, a rotary outer sleeve (6), a transmission inner sleeve (7), and an end cap (8). The bearing is disposed in the drill rod assembly hole (54). The rotary outer sleeve (6) is disposed on the bearing. The rotary outer sleeve (6) and the transmission inner sleeve (7) are connected in a transmission sleeve. The end cap (8) is detachably assembled at the end of the rotary outer sleeve (6). An external gear ring (9) is fitted on the outer circumference of the rotating outer sleeve (6), and the external gear ring (9) meshes with the driving teeth for transmission; The end of the rotating outer jacket (6) is provided with an L-shaped clamping plate (61), and the outer circumference of the end cap (8) is provided with an ear plate (81) that can be rotatably engaged with the clamping plate (61). The end cap (8) is rotatably engaged with the end of the rotating outer jacket (6) through the ear plate (81).

2. The rear-mounted drill pipe loading and unloading drilling rig as described in claim 1, characterized in that: The inner circumference of the rotating outer sleeve (6) is a hexagonal structure that can transmit torque. The outer circumference of the transmission inner sleeve (7) is a hexagonal structure that matches the rotating outer sleeve (6), and the inner circumference is a square structure that matches the female head of the drill rod (12). The inner diameter of the transmission inner sleeve (7) matches the female head of the drill rod (12).

3. The rear-mounted drill pipe loading and unloading drilling rig as described in claim 1, characterized in that: The support rod seat (1) includes two lifting support rods located at the beginning and end.

4. The rear-mounted drill pipe loading and unloading drilling rig as described in claim 3, characterized in that: The lifting support rod includes two support rods that are nested together and a limiting pin (10). Multiple limiting holes (11) matching the limiting pin (10) are provided between the two support rods. The height of the two support rods is adjusted and fixed by the limiting pin (10) passing through the limiting hole (11).

5. A rear-mounted drill pipe loading and unloading drilling rig as described in claim 1, characterized in that: The slide bar seat (2) includes two parallel slide bars and a connecting plate (21) respectively disposed between the two ends of the slide bars. The bottom of the connecting plate (21) is detachably mounted on the support rod seat (1). A connecting seat (22) for fixing the hydraulic cylinder (4) is provided at one end of the slide bar seat (2). A fixing plate (23) for connecting and assembling the drilling rig base is provided near the tail end of the slide bar seat (2).

6. A method for loading drill rods in a rear-mounted drill rod loading and unloading drilling rig as described in any one of claims 1-5, characterized in that, Includes the following steps: First, start the drilling machine to drill the first drill rod (12) into the borehole. At this time, the rotary drive (5) is pushed to the front end of the drilling machine. Second, remove the end cap (8), start the hydraulic cylinder (4) to push the rotary drive (5) further forward until the female head of the first drill rod (12) passes through the rotary drive (5), and at this time remove the transmission inner sleeve (7) that is still attached to the female head. Third, take the second drill rod (12) and connect its male end to the female end of the first drill rod (12); Fourth, start the hydraulic cylinder (4) to pull the rotary drive (5) back to the female end of the second drill rod (12), and then put the removed transmission inner sleeve (7) back onto the female end of the second drill rod (12), and pull the rotary drive (5) back again until the transmission inner sleeve (7) is completely inserted into the rotary outer sleeve (6). At this time, the rotary drive (5) is pulled back to near the tail end of the drilling rig. Fifth, rotate the end cap (8) into the rotary drive (5) to complete one loading of the drill rod (12); Sixth, repeat the above steps until the drill pipe is loaded.

7. A method for disassembling and retracting drill rods in a rear-mounted drill rod loading and unloading drilling rig as described in any one of claims 1-5, characterized in that, Includes the following steps: First, start the drilling rig, push the rotary drive (5) to the end of the drilling rig, then remove the end cover (8), start the hydraulic cylinder (4) to push the rotary drive (5) forward further until the female head of the drill rod (12) and part of the drill rod body at the end pass through the rotary drive (5). Second, a sleeve tool (13) is used to fit and temporarily fix it to the drill rod (12) at the end. The outer diameter of the end of the sleeve tool (13) facing the rotary drive (5) is larger than the outer diameter of the drill rod assembly hole (54) so ​​that the sleeve tool (13) can be supported against the end side of the rotary drive (5). The casing fixture (13) includes a pipe body with an inner diameter greater than the outer diameter of the drill rod (12) and a flange at one end of the pipe body. The outer diameter of the flange is greater than the outer diameter of the drill rod assembly hole (54). The pipe body and the drill rod are both provided with pin holes. The pipe body is temporarily fixed to the drill rod (12) by a fixing pin (14). Third, start the hydraulic cylinder (4) to pull back the rotary drive (5). At this time, the rotary drive (5) pushes the casing fixture (13) against its end side. The casing fixture (13) pulls back the drill rod (12) that is temporarily fixed to it. The connection end of the drill rod (12) and the secondary drill rod (12) is completely pulled out of the borehole and enters the stroke of the slide (3). Fourth, remove the casing fixture (13) and detach the male end of the drill pipe (12) from the female end of the secondary drill pipe (12); Fifth, start the hydraulic cylinder (4) to push the rotary drive (5) forward to the female end of the secondary drill rod (12) until the female end of the secondary drill rod (12) passes through the rotary drive (5), thus completing the removal and disassembly of the drill rod. Sixth, repeat the above steps until the drill pipe is completely removed and disassembled.

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