A magnetic base drilling machine for small caliber deep holes

Abstract

The application relates to the technical field of magnetic seat drilling machines, in particular to a magnetic seat drilling machine for small-diameter deep holes, which comprises a magnetic suction seat, a sliding drilling machine, a speed reduction driving assembly and an auxiliary telescopic support. The magnetic suction seat is in the shape of a long strip, one end of the magnetic suction seat is a first magnetic suction part, and the other end of the magnetic suction seat is provided with a handle. The sliding drilling machine comprises a drilling machine body and a drill bit. The auxiliary telescopic support comprises a multi-section telescopic support, a sliding limiting mechanism, a locking mechanism, an unlocking mechanism and an elastic sleeve. The multi-section telescopic support comprises a strip-shaped fixing frame, a first telescopic support and a second telescopic support. The end of the second telescopic support is a second magnetic suction part. A bent pipe nozzle with one end facing the end part of the drill bit is arranged in the elastic sleeve. The auxiliary telescopic support of the device can keep the relative position of the bent pipe nozzle and the end part of the drill bit unchanged before and after drilling, and can simulate manual hand-held spraying guns, so that the labor intensity is greatly reduced.

Description

Technical Field

[0001] This invention relates to the field of magnetic drilling machine technology, specifically to a magnetic drilling machine for small-diameter deep holes. Background Technology

[0002] Magnetic drill rigs, also known as magnetic power drills or magnetic drilling machines, are also called magnetic drills, steel plate drills, magnetic iron drills, suction drills, and steel plate hole openers in the market. Originating in Europe and America, magnetic drill rigs were initially limited to large drilling machines. In complex working environments, they were simply unusable. The arrival of magnetic drill rigs provided a solution for many customers, causing a significant stir in the European and American machinery industries and quickly spreading globally.

[0003] Once connected to a power source, the powerful magnetic force generated by the magnetic base causes the magnetic drill to adhere to the workpiece for drilling. Currently, the largest drilling diameter of commonly used magnetic drills on the market can reach 100mm-120mm, while the smallest model weighs only 9.8kg.

[0004] Traditional magnetic drilling machines mostly use manual cranking to control the forward movement of the drilling machine. When the drill bit is drilling into the workpiece, the drilling machine will encounter great resistance as it moves forward. At this time, manual cranking will be very strenuous and will cause discontinuity in the drilling process due to the sluggishness of the manual cranking, ultimately resulting in cross-sections in the drill hole.

[0005] Before drilling, lubricating oil needs to be sprayed onto the drill bit to reduce friction between the drill bit and the workpiece. During drilling, air needs to be sprayed onto the hole to blow away the debris generated during drilling. Traditionally, these steps are all done manually by holding the spray gun, which increases labor costs. Furthermore, when drilling continuously, the operator needs to hold the spray gun continuously, which increases the labor intensity. Therefore, it is necessary to provide a magnetic base drilling machine for small-diameter deep holes to solve the above problems. Summary of the Invention

[0006] Therefore, it is necessary to provide a magnetic drilling machine for small-diameter deep holes to address the existing technical problems.

[0007] To solve the problems of existing technologies, the technical solution adopted by the present invention is as follows: a magnetic base drilling machine for small-diameter deep holes, comprising a magnetic base, a sliding drilling machine, a reduction drive assembly, and an auxiliary telescopic support. The magnetic base is generally elongated, with one end being a first magnetic suction part for fixing the magnetic base to a metal workpiece, and the other end having a handle. The sliding drilling machine includes a drilling body and a drill bit, the drill bit being horizontally and detachably connected to the drilling body. The drilling body is slidably connected to the top of the magnetic base. The reduction drive assembly is disposed on the magnetic base and is used to drive the drilling body to slide slowly along the axial direction of the drill bit. The auxiliary telescopic support includes a multi-section telescopic frame, a sliding limit mechanism, a locking mechanism, an unlocking mechanism, and an elastic sleeve. The multi-section telescopic frame is disposed on the side of the drilling body, and the multi-section telescopic frame... The telescopic direction is consistent with the forward direction of the drill bit. The multi-section telescopic frame includes a strip-shaped fixed frame that can move together with the drill body, a primary telescopic frame that slides within the strip-shaped fixed frame, and a secondary telescopic frame that slides within the primary telescopic frame. A sliding limit mechanism is used to limit the sliding of the primary telescopic frame. The end of the secondary telescopic frame is a second magnetic suction part used to fix one end of the secondary telescopic frame to the metal workpiece. Both the locking mechanism and the unlocking mechanism are located within the secondary telescopic frame. The locking mechanism is used to connect the primary telescopic frame and the secondary telescopic frame. The unlocking mechanism is used to unlock the primary telescopic frame and the secondary telescopic frame when the end of the secondary telescopic frame abuts against the metal workpiece. An elastic sleeve is fixedly located on the side of the secondary telescopic frame near the drill bit. A curved nozzle with one end facing the end of the drill bit is locked inside the elastic sleeve.

[0008] Furthermore, a strip-shaped groove is provided on the top of the magnetic suction base. The length direction of the strip-shaped groove is consistent with the length direction of the magnetic suction base. A linear slide rail is fixedly installed inside the strip-shaped groove. A slider slides on the linear slide rail. The movement direction of the slider is consistent with the axis of the drill bit. The drill body is fixedly installed on the top of the slider.

[0009] Furthermore, the reduction drive assembly includes a drive gear, a first gear, a second gear, a drive gear, a rack, and a motor. A mounting groove is formed inwards on one side wall of the magnetic suction base, and a mounting plate covers the opening of the groove. A vertical groove connects the mounting groove and the strip-shaped groove. The drive gear, first gear, and second gear are all rotatably mounted within the mounting groove. The motor is horizontally fixed on the side of the magnetic suction base without the mounting plate. The drive gear is coaxially fixed to the output end of the motor. The first gear and second gear are coaxially connected, and the first gear meshes with the drive gear. The rack is horizontally fixed to the bottom of the slider, with its length direction aligned with the slider's movement direction. The drive gear is rotatably mounted within the vertical groove, located between the rack and the second gear, and meshes with both the second gear and the rack. The diameter of the first gear is larger than that of the drive gear, and the diameter of the drive gear is larger than that of the second gear.

[0010] Furthermore, the strip-shaped fixing frame, the first-stage telescopic frame, and the second-stage telescopic frame are all U-shaped strips. The length direction of all three is parallel to the axis of the drill bit, and the opening side of all three is away from the drill bit. Among them, the strip-shaped fixing frame is horizontal and is fixed to the top of the slider through the connecting frame. The sliding limiter includes a limit pin, a washer, and a fastening nut. A strip-shaped through groove is opened on the vertical surface of the strip-shaped fixing frame. The length direction of the strip-shaped through groove is consistent with the length direction of the strip-shaped fixing frame. The limit pin is fixed to the vertical surface of the first-stage telescopic frame. The axis of the limit pin is perpendicular to the vertical surface of the first-stage telescopic frame, and one end of the limit pin passes through the strip-shaped through groove. The end of the limit pin that protrudes from the strip-shaped through groove is a threaded end. The fastening nut is screwed onto the threaded end of the limit pin. The washer is sleeved on the protruding end of the limit pin and is located between the fastening nut and the vertical surface of the strip-shaped fixing frame.

[0011] Furthermore, the locking mechanism includes a U-shaped connecting frame fixed to the opening side of the secondary telescopic frame and two sets of elastic locking pins symmetrically distributed vertically within the U-shaped connecting frame. Each set of elastic locking pins includes a columnar sleeve, a first spring, and a transverse locking pin. The axial direction of the columnar sleeve is perpendicular to the vertical surface of the secondary telescopic frame. One end of the columnar sleeve is an open structure, and the other end is coaxially formed with a retaining ring. The open end of the columnar sleeve is fixedly connected to the vertical surface of the U-shaped connecting frame. The transverse locking pin passes through the retaining ring coaxially. One end of the transverse locking pin is formed with a convex ring that slides within the columnar sleeve. The first spring is located within the columnar sleeve, and both ends of the first spring abut against the end of the convex ring and the vertical surface of the U-shaped connecting frame, respectively. Two locking holes are opened on the vertical surfaces of both the primary and secondary telescopic frames, which correspond to the two transverse locking pins respectively. When locking, the other end of each transverse locking pin passes through the corresponding locking holes on the secondary and primary telescopic frames in sequence.

[0012] Furthermore, the unlocking mechanism includes a sliding rod whose length direction is consistent with that of the secondary telescopic frame. The sliding rod slides on the vertical surface of the secondary telescopic frame near its opening and is located between two transverse locking pins. The end of the sliding rod facing the U-shaped connecting frame is formed with a first inclined wedge surface. The other end of the sliding rod passes through the second magnetic suction part and extends out of the secondary telescopic frame. The two convex rings are connected by a connecting vertical rod. Each columnar sleeve is provided with a clearance groove for the connecting vertical rod to slide. An inclined wedge block is formed in the middle of the connecting vertical rod. A second inclined wedge surface is formed on the side of the inclined wedge block facing the first inclined wedge surface. The first inclined wedge surface and the second inclined wedge surface are wedge-fitted together.

[0013] Furthermore, two pins are formed at the end of the first-level telescopic frame near the second-level telescopic frame, which are symmetrically distributed vertically. Both the upper and lower surfaces of the second-level telescopic frame that are in contact with the first-level telescopic frame are provided with strip grooves. The length direction of the strip grooves is consistent with the length direction of the second-level telescopic frame. The pin located above is inserted downward into the corresponding strip groove, and the pin located below is inserted upward into the corresponding strip groove. When the first-level telescopic frame and the second-level telescopic frame are fixed, each pin is located in the end of the strip groove near the first-level telescopic frame.

[0014] Furthermore, a horizontal guide groove is formed on the vertical surface of the secondary telescopic frame near its opening. The sliding rod is located in the guide groove, and an elastic reset mechanism for driving the sliding rod to reset is provided on the guide groove. The elastic reset mechanism includes a fixed plate, a limiting plate, and a second spring. A stop block protruding towards the opening of the secondary telescopic frame is formed on the sliding rod. The fixed plate spans the guide groove and is fixedly connected to the secondary telescopic frame. The fixed plate and the stop block are spaced apart along the length of the guide groove. One end of the fixed plate near the sliding rod has a first inclined wedge surface. The second spring is horizontally fixed between the fixed plate and the stop block, and both ends of the second spring abut against the fixed plate and the stop block, respectively. The limiting plate slides on the guide groove, and the limiting plate abuts against the side of the stop block away from the fixed plate. The limiting plate is locked to the guide groove by two fastening bolts distributed vertically.

[0015] Furthermore, the end of each transverse locking pin facing the first-level telescopic frame is a rounded end.

[0016] The beneficial effects of this invention compared to the prior art are:

[0017] Firstly, the speed reduction drive component of this device drives the drilling rig to move forward slowly, thereby replacing the traditional manual hand-cranking method with a mechanical approach, which improves efficiency and reduces the intensity of manual labor.

[0018] Secondly, the auxiliary telescopic support of this device ensures that the relative position of the curved nozzle to the end of the drill bit does not change before and after drilling, simulating the manual hand-held spray gun, thereby greatly reducing the intensity of manual labor.

[0019] Thirdly, during the entry and exit of the drill bit, the auxiliary telescopic support of this device allows the air jet from the curved nozzle to act on the drill hole and the entire drill bit. This prevents debris from entering the drill hole during entry and blows away debris adhering to the drill bit during exit. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the three-dimensional structure of the embodiment. Figure 1 ;

[0021] Figure 2 yes Figure 1 A magnified view of the area indicated by A1 in the diagram;

[0022] Figure 3 This is a schematic diagram of the three-dimensional structure of the embodiment. Figure 2 ;

[0023] Figure 4 This is a top view of an embodiment;

[0024] Figure 5 yes Figure 4 Sectional view along line AA;

[0025] Figure 6 This is a three-dimensional structural schematic diagram of the deceleration drive component in the embodiment;

[0026] Figure 7 This is a three-dimensional structural diagram of the auxiliary telescopic support in an embodiment;

[0027] Figure 8 This is a side view of the auxiliary telescopic bracket in the embodiment;

[0028] Figure 9 yes Figure 8 Sectional view along line BB;

[0029] Figure 10 yes Figure 9 The enlarged view of the area indicated by A2 in the diagram;

[0030] Figure 11 yes Figure 9 The enlarged view of the area indicated in A3;

[0031] Figure 12 yes Figure 8 Sectional view along line CC;

[0032] Figure 13 This is a three-dimensional structural schematic diagram of the elastic locking pin in the embodiment;

[0033] Figure 14 This is a three-dimensional structural diagram of the primary telescopic frame and the secondary telescopic frame in an embodiment;

[0034] Figure 15 yes Figure 14 The enlarged view shown in A4 is a partial diagram.

[0035] The diagram is labeled as follows: 1. Magnetic suction base; 2. Sliding drill rig; 3. Magnetic suction part No. 1; 4. Handle; 5. Drill rig body; 6. Drill bit; 7. Elastic ferrule; 8. Strip-shaped fixing frame; 9. First-stage telescopic frame; 10. Second-stage telescopic frame; 11. Magnetic suction part No. 2; 12. Curved nozzle; 13. Strip groove; 14. Linear slide rail; 15. Slider; 16. Drive gear; 17. Gear No. 1; 18. Gear No. 2; 19. Drive gear; 20. Rack; 21. Motor; 22. Mounting slot; 23. Mounting plate; 24. Vertical slot; 25. Connecting frame; 26. Limit pin; 27. Shim; 28. 1. Fastening nut; 29. ​​Strip groove; 30. U-shaped connecting bracket; 31. Column sleeve; 32. No. 1 spring; 33. Horizontal locking pin; 34. Retaining ring; 35. Protruding ring; 36. Locking hole; 37. Sliding rod; 38. First inclined wedge surface; 39. Connecting vertical rod; 40. Clearance groove; 41. Inclined wedge block; 42. Second inclined wedge surface; 43. Pin; 44. Strip groove; 45. Guide groove; 46. Fixing plate; 47. Limiting plate; 48. No. 2 spring; 49. Abutment block; 50. Fastening bolt; 51. Round head end; 52. Control switch; 53. No. 1 limit strip; 54. No. 2 limit strip. Implementation

[0036] To further understand the features, technical means, and specific objectives and functions achieved by the present invention, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0037] refer to Figures 1 to 15The magnetic base drill for small-diameter deep holes, as shown, includes a magnetic base 1, a sliding drill 2, a reduction drive assembly, and an auxiliary telescopic support. The magnetic base 1 is generally elongated, with one end having a first magnetic suction part 3 for fixing the magnetic base 1 to a metal workpiece, and the other end having a handle 4. The sliding drill 2 includes a drill body 5 and a drill bit 6. The drill bit 6 is horizontally and detachably connected to the drill body 5. The drill body 5 is slidably connected to the top of the magnetic base 1. The reduction drive assembly is located on the magnetic base 1 and is used to drive the drill body 5 to slide slowly along the axial direction of the drill bit 6. The auxiliary telescopic support includes a multi-section telescopic frame, a sliding limit mechanism, a locking mechanism, an unlocking mechanism, and an elastic sleeve 7. The multi-section telescopic frame is located beside the drill body 5, and the telescopic direction of the multi-section telescopic frame is consistent with the forward direction of the drill bit 6. The telescopic frame includes a strip-shaped fixed frame 8 that can move together with the drill body 5, a primary telescopic frame 9 that slides within the strip-shaped fixed frame 8, and a secondary telescopic frame 10 that slides within the primary telescopic frame 9. A sliding limit mechanism is used to limit the sliding of the primary telescopic frame 9. The end of the secondary telescopic frame 10 is a second magnetic suction part 11 used to fix one end of the secondary telescopic frame 10 to a metal workpiece. Both the locking mechanism and the unlocking mechanism are located within the secondary telescopic frame 10. The locking mechanism is used to connect the primary telescopic frame 9 and the secondary telescopic frame 10. The unlocking mechanism is used to unlock the primary telescopic frame 9 and the secondary telescopic frame 10 when the end of the secondary telescopic frame 10 comes into contact with the metal workpiece. An elastic sleeve 7 is fixedly located on the side of the secondary telescopic frame 10 near the drill bit 6. A curved nozzle 12 with one end facing the end of the drill bit 6 is locked inside the elastic sleeve 7.

[0038] First, select a drill bit 6 of a specific length according to the current drilling process requirements. After installing the drill bit 6 on the drilling machine body 5, unfold the multi-section telescopic frame. During this process, first extend the secondary telescopic frame 10 and fix the secondary telescopic frame 10 to the primary telescopic frame 9 through the locking mechanism. Then slide the primary telescopic frame 9. At this time, the primary telescopic frame 9 will slide together with the secondary telescopic frame 10. After sliding the primary telescopic frame 9 to the end of the curved nozzle 12 facing the end of the drill bit 6, restrict the sliding of the primary telescopic frame 9 through the sliding limit mechanism. At this time, the primary telescopic frame 9 and the secondary telescopic frame 10 are both in a fixed state. Then, fix the magnetic suction seat 1 to the metal workpiece to be drilled through the first magnetic suction part 3. The first magnetic suction part 3 is composed of several powerful electromagnets, and the magnetic suction seat 1 is equipped with a control switch 52 for synchronously switching on and off several powerful electromagnets.

[0039] Before drilling with drill bit 6, one end of the curved nozzle 12 can be connected to lubricating oil via a hose (not shown in the figure). This allows lubricating oil to be sprayed onto the end of drill bit 6 through the curved nozzle 12, reducing friction between drill bit 6 and the metal workpiece during drilling. Subsequently, the deceleration drive assembly controls the displacement of the drill body 5, thereby driving drill bit 6 to slowly advance towards the metal workpiece. During this process, the multi-section telescopic frame moves along with the drill body 5. The second magnetic attraction part 11 on the secondary telescopic frame 10 gradually approaches the metal workpiece until it contacts it, allowing one end of the secondary telescopic frame 10 to pass through… The second magnetic suction part 11 is fixedly connected to the metal workpiece. At the same time, the unlocking mechanism will unlock the first telescopic frame 9 and the second telescopic frame 10, so that the second telescopic frame 10 is in an active state. When the second telescopic frame 10 is in an active state, as the drill body 5 continues to move forward, the second telescopic frame 10 will slide continuously inside the first telescopic frame 9 until the drill bit 6 completely enters the metal workpiece. When the drill bit 6 is drilling, one end of the bent nozzle 12 can be connected to high-pressure gas through a hose, so as to continuously spray air onto the drilling part through the bent nozzle 12 to prevent the debris generated during drilling from being carried into the drilling hole again with the drill bit 6.

[0040] When the deceleration drive assembly controls the drill body 5 to move in the opposite direction, thereby driving the drill bit 6 to be pulled out of the borehole, the strip-shaped fixing frame 8 and the first-level telescopic frame 9 will move together with the drill body 5. The second-level telescopic frame 10 will not move because one end of it is magnetically fixed to the metal workpiece. Therefore, the position of the curved nozzle 12 set on the second-level telescopic frame 10 will not change. So, during the process of the drill bit 6 being pulled out of the borehole, the curved nozzle 12 blows away the debris attached to the entire drill bit 6.

[0041] Through the above steps, the relative position of the curved nozzle 12 to the end of the drill bit 6 does not change before and after drilling. When the drill bit 6 enters and exits the hole, the air jet from the curved nozzle 12 can act on the hole and the entire drill bit 6. This prevents debris from entering the hole when the drill bit 6 enters the hole. When exiting the hole, the curved nozzle 12 sprays air from the tail to the head onto the entire drill bit 6, thereby blowing away the debris attached to the drill bit 6.

[0042] To demonstrate how the drill body 5 slides and connects with the top of the magnetic chuck 1, the following features are specifically designed:

[0043] The top of the magnetic suction base 1 is provided with a strip-shaped groove 13. The length direction of the strip-shaped groove 13 is consistent with the length direction of the magnetic suction base 1. A linear slide rail 14 is fixedly provided in the strip-shaped groove 13. A slider 15 is slidably provided on the linear slide rail 14. The movement direction of the slider 15 is consistent with the axis of the drill bit 6. The drill body 5 is fixedly provided on the top of the slider 15.

[0044] The slider 15 ensures that the drill body 5 can only be displaced along the axial direction of the drill bit 6, thereby ensuring that the drill bit 6 can drill horizontally into the metal workpiece.

[0045] To demonstrate the specific structure of the deceleration drive component, the following features were set:

[0046] The reduction drive assembly includes a drive gear 16, a first gear 17, a second gear 18, a drive gear 19, a rack 20, and a motor 21. A mounting groove 22 is formed inwardly on one side wall of the magnetic suction base 1. A mounting plate 23 covers the opening of the mounting groove 22. A vertical groove 24 connects the mounting groove 22 and the strip-shaped groove 13. The drive gear 16, first gear 17, and second gear 18 are all rotatably mounted within the mounting groove 22. The motor 21 is horizontally fixed on the side of the magnetic suction base 1 without the mounting plate 23. The output ends of the drive gear 16 and the motor 21... The first gear 17 and the second gear 18 are coaxially connected, and the first gear 17 meshes with the driving gear 16. The rack 20 is horizontally fixed at the bottom of the slider 15, and the length direction of the rack 20 is consistent with the movement direction of the slider 15. The driving gear 19 is rotatably disposed in the vertical groove 24. The driving gear 19 is located between the rack 20 and the second gear 18, and the driving gear 19 meshes with the second gear 18 and the rack 20. The diameter of the first gear 17 is larger than the diameter of the driving gear 16, and the diameter of the driving gear 19 is larger than the diameter of the second gear 18.

[0047] When motor 21 starts, its output will drive the drive gear 16 to rotate. Then, the first gear 17, which meshes with the drive gear 16, will be driven to rotate. Since the diameter of the first gear 17 is larger than the diameter of the drive gear 16, the first gear 17 and the second gear 18, which is coaxially connected to the first gear 17, will rotate slowly. After the second gear 18 rotates, it will drive the drive gear 19 to rotate. Since the diameter of the drive gear 19 is larger than the diameter of the second gear 18, the speed of the drive gear 19 will be further reduced. Finally, the rack 20 will be driven by the drive gear 19 to drive the slider 15 to move slowly. Through the above steps, the drive gear 19 achieves two stages of speed reduction to ensure the slow displacement of the slider 15.

[0048] To demonstrate the specific structure of the sliding limit mechanism, the following features are provided:

[0049] The strip-shaped fixing frame 8, the first-stage telescopic frame 9, and the second-stage telescopic frame 10 are all U-shaped strips. The length direction of all three is parallel to the axis of the drill bit 6, and the opening side of all three is away from the drill bit 6. Among them, the strip-shaped fixing frame 8 is horizontal and is fixed to the top of the slider 15 through the connecting frame 25. The sliding limit mechanism includes a limit pin 26, a washer 27, and a fastening nut 28. A strip-shaped through groove 29 is opened on the vertical surface of the strip-shaped fixing frame 8. The length direction of the strip-shaped through groove 29 is parallel to the axis of the drill bit 6. The length direction of the fixed frame 8 is consistent. The limiting pin 26 is fixed to the vertical surface of the first-level telescopic frame 9. The axial direction of the limiting pin 26 is perpendicular to the vertical surface of the first-level telescopic frame 9. One end of the limiting pin 26 passes through the strip groove 29. The end of the limiting pin 26 that passes through the strip groove 29 is the threaded end. The fastening nut 28 is screwed onto the threaded end of the limiting pin 26. The washer 27 is sleeved on the protruding end of the limiting pin 26 and the washer 27 is located between the fastening nut 28 and the vertical surface of the strip fixed frame 8.

[0050] The mutual sliding between the strip-shaped fixed frame 8, the primary telescopic frame 9, and the secondary telescopic frame 10 is as follows: Figure 1 As shown, the strip-shaped fixing frame 8 is provided with several No. 1 limiting strips 53 for limiting the sliding direction of the first-stage telescopic frame 9, and the first-stage telescopic frame 9 is provided with several No. 2 limiting strips 54 for limiting the sliding direction of the second-stage telescopic frame 10, so as to ensure that the direction of unfolding of the multi-section telescopic frame is consistent with the forward direction of the drill bit 6.

[0051] When the fastening nut 28 is loosened, the first-stage telescopic frame 9 is in an active state. At this time, the position of the first-stage telescopic frame 9 and the second-stage telescopic frame 10 in the horizontal direction can be adjusted by sliding the first-stage telescopic frame 9, so as to ensure that one end of the curved nozzle 12 on the second-stage telescopic frame 10 can face the end of the current drill bit 6. Furthermore, when changing drill bits 6 of different lengths in the future, the final position of the curved nozzle 12 can also be determined by sliding the first-stage telescopic frame 9.

[0052] Once the position of the curved nozzle 12 is determined, tighten the fastening nut 28 to fix the primary telescopic frame 9 to the strip-shaped fixed frame 8.

[0053] To demonstrate the specific structure of the locking mechanism, the following features were set:

[0054] The locking mechanism includes a U-shaped connecting frame 30 fixed to the open side of the secondary telescopic frame 10 and two sets of elastic locking pins symmetrically distributed vertically within the U-shaped connecting frame 30. Each set of elastic locking pins includes a columnar sleeve 31, a first spring 32, and a transverse locking pin 33. The axial direction of the columnar sleeve 31 is perpendicular to the vertical surface of the secondary telescopic frame 10. One end of the columnar sleeve 31 is open, and the other end has a retaining ring 34 coaxially formed. The open end of the columnar sleeve 31 is fixedly connected to the vertical surface of the U-shaped connecting frame 30, and the transverse locking pin 33 coaxially passes through the retaining ring 34. One end of the ring 34 and the transverse locking pin 33 is formed with a convex ring 35 that slides inside the columnar sleeve 31. The first spring 32 is located inside the columnar sleeve 31. The two ends of the first spring 32 abut against the end of the convex ring 35 and the vertical surface of the U-shaped connecting frame 30, respectively. The vertical surfaces of the first-stage telescopic frame 9 and the second-stage telescopic frame 10 are each provided with two locking holes 36 that correspond to the two transverse locking pins 33, respectively. When locked, the other end of each transverse locking pin 33 passes through the corresponding locking holes 36 on the second-stage telescopic frame 10 and the first-stage telescopic frame 9 in sequence.

[0055] like Figure 12 As shown, when locked, the first spring 32 in each columnar sleeve 31 fully releases its elastic force, thereby pushing the convex ring 35 through the elastic force of the first spring 32, and thus causing the transverse locking pin 33 to extend into the corresponding lock hole 36. Finally, the first-level telescopic frame 9 and the second-level telescopic frame 10 are fixedly connected by the two transverse locking pins 33. When unlocked by the unlocking mechanism, the unlocking mechanism will drive the two transverse locking pins 33 to retract synchronously, thereby making the second-level telescopic frame 10 in an active state.

[0056] To demonstrate the specific structure of the unlocking mechanism, the following features were incorporated:

[0057] The unlocking mechanism includes a sliding rod 37, the length of which is consistent with the length of the secondary telescopic frame 10. The sliding rod 37 slides on the vertical surface of the secondary telescopic frame 10 near its opening and is located between two transverse locking pins 33. The end of the sliding rod 37 facing the U-shaped connecting frame 30 is formed with a first inclined wedge surface 38. The other end of the sliding rod 37 passes through the second magnetic suction part 11 and extends out of the secondary telescopic frame 10. The two convex rings 35 are connected by a connecting vertical rod 39. Each columnar sleeve 31 is provided with a clearance groove 40 for the connecting vertical rod 39 to slide. An inclined wedge block 41 is formed in the middle of the connecting vertical rod 39. A second inclined wedge surface 42 is formed on the side of the inclined wedge block 41 facing the first inclined wedge surface 38. The first inclined wedge surface 38 and the second inclined wedge surface 42 are wedge-fitted together.

[0058] When the secondary telescopic frame 10 moves toward the metal workpiece, one end of the sliding rod 37 extending from the secondary telescopic frame 10 first contacts the metal workpiece. During this process, the other end of the sliding rod 37 moves toward the wedge block 41. At this time, through the wedge engagement of the first wedge surface 38 and the second wedge surface 42, the wedge block 41 will drive the connecting vertical rod 39 to slide in the corresponding clearance groove 40, and the connecting vertical rod 39 will drive the two convex rings 35 to compress the first spring 32. At the same time, the two transverse locking pins 33 will retract into the corresponding columnar sleeves 31, thereby enabling the secondary telescopic frame 10 to move toward the metal workpiece. After the telescopic frame 10 is unlocked from the first-level telescopic frame 9, when one end of the second-level telescopic frame 10 with the second magnetic suction part 11 is magnetically fixed to the metal workpiece, the movable second-level telescopic frame 10 will slide into the first-level telescopic frame 9. And through the elastic force of the two first springs 32, during the process of the second-level telescopic frame 10 sliding into the first-level telescopic frame 9, one end of each of the two transverse locking pins 33 will be in contact with the vertical surface of the first-level telescopic frame 9. Finally, as the drill bit 6 continuously drills into the metal workpiece, the multi-section telescopic frame can gradually retract to match the horizontal displacement of the drill bit 6.

[0059] The lengths of both ends of the sliding rod 37 are controlled to ensure that when the first-level telescopic frame 9 and the second-level telescopic frame 10 are unlocked, the distance between the second magnetic suction part 11 on the second-level telescopic frame 10 and the metal workpiece is sufficient to attract the second-level telescopic frame 10 to the metal workpiece with magnetic force.

[0060] When the drill rig body 5 reverses until the drill bit 6 is completely withdrawn, in order to ensure that the secondary telescopic frame 10 can also reverse and reset along with the primary telescopic frame 9, the following features are specifically designed:

[0061] Two pins 43 are formed at the end of the primary telescopic frame 9 near the secondary telescopic frame 10, which are symmetrically distributed vertically. The upper and lower surfaces of the secondary telescopic frame 10 that are in contact with the primary telescopic frame 9 are provided with strip grooves 44. The length direction of the strip grooves 44 is consistent with the length direction of the secondary telescopic frame 10. The upper pin 43 is inserted downward into the corresponding strip groove 44, and the lower pin 43 is inserted upward into the corresponding strip groove 44. When the primary telescopic frame 9 and the secondary telescopic frame 10 are fixed, each pin 43 is located in the end of the strip groove 44 near the primary telescopic frame 9.

[0062] After the primary telescopic frame 9 and the secondary telescopic frame 10 are unlocked via the slide bar, the primary telescopic frame 9 will slide towards the metal workpiece. The secondary telescopic frame 10, whose end is magnetically fixed to the metal workpiece, will gradually retract into the primary telescopic frame 9. Simultaneously, each pin 43 will slide from one end of its corresponding strip groove 44 to the other. When the drill body 5 reverses and resets, the primary telescopic frame 9 will cause the two pins 43 to slide in opposite directions within the two strip grooves 44. Since one end of the primary telescopic frame 9 is magnetically fixed to the metal workpiece, the primary telescopic frame 9 will not shift until each pin 43 shifts in the opposite direction and contacts one end of the strip groove 44, i.e., when the drill bit 6 is completely withdrawn from the borehole. At this point, the primary telescopic frame 9 will exert a traction force on the secondary telescopic frame 10. This traction force is greater than the magnetic attraction between the second magnetic attraction part 11 and the metal workpiece. Therefore, the primary telescopic frame 9 will be pulled by the secondary telescopic frame 10 and reversed and reset together until the drill body 5 reverses and resets to its initial state.

[0063] After the primary telescopic frame 9 drives the secondary telescopic frame 10 to separate from the metal workpiece, in order to allow the sliding rod 37 to reset and thus lock the primary telescopic frame 9 and the secondary telescopic frame 10 again, the following features are specifically provided:

[0064] A horizontal guide groove 45 is formed on the vertical surface of the secondary telescopic frame 10 near its opening. A sliding rod 37 is disposed in the guide groove 45. An elastic reset mechanism for driving the sliding rod 37 to reset is provided on the guide groove 45. The elastic reset mechanism includes a fixed plate 46, a limiting plate 47, and a second spring 48. A stop block 49 protruding towards the opening of the secondary telescopic frame 10 is formed on the sliding rod 37. The fixed plate 46 spans the guide groove 45 and is fixedly connected to the secondary telescopic frame 10. The fixed plate 46 and the stop block 49 are connected along the guide groove 45. The guide groove 45 is spaced apart along its length. The fixed plate 46 is located near the sliding rod 37 with one end of the first inclined wedge surface 38. The second spring 48 is horizontally fixed between the fixed plate 46 and the abutment 49, and the two ends of the second spring 48 abut against the fixed plate 46 and the abutment 49 respectively. The limiting plate 47 slides on the guide groove 45, and the limiting plate 47 abuts against the side of the abutment 49 away from the fixed plate 46. The limiting plate 47 is locked to the guide groove 45 by two fastening bolts 50 distributed vertically.

[0065] Combination Figures 9 to 11As shown, when the sliding rod 37 extends from one end of the secondary telescopic frame 10 and comes into contact with the metal workpiece, the sliding rod 37 will slide toward the two transverse locking pins 33. At this time, the end of the sliding rod 37 with the first inclined wedge surface 38 drives the two transverse locking pins 33 to retract. At the same time, the abutment 49 on the sliding rod 37 will compress the second spring 48. Afterwards, when the primary telescopic frame 9 moves in the opposite direction and drives the secondary telescopic frame 10 to reset, the two transverse locking pins 33 are respectively aligned with the two locking holes 36 on the primary telescopic frame 9 and the secondary telescopic frame 10. However, at this time, each transverse locking pin... All pins 33 are driven by sliding rod 37 to be in a retracted state. After that, the end of sliding rod 37 that is in contact with the metal workpiece will gradually separate from the metal workpiece. During the process of gradually separating sliding rod 37 from the metal workpiece, the return force of spring 48 will drive sliding rod 37 to gradually return to its original position, so that the end of sliding rod 37 with the first wedge surface 38 will gradually separate from the wedge block 41. At this time, the two retracted transverse locking pins 33 will be inserted into the two locking holes 36 again, so that the first telescopic frame 9 and the second telescopic frame 10 will be locked again.

[0066] During the retraction of the secondary telescopic frame 10 into the primary telescopic frame 9, in order to reduce the friction between one end of each transverse locking pin 33 and the vertical surface of the primary telescopic frame 9, the following features are specifically designed:

[0067] Each transverse locking pin 33 has a rounded end 51 at one end facing the first-level telescopic frame 9.

[0068] During the process of the secondary telescopic frame 10 sliding into the primary telescopic frame 9, one end of each of the two transverse locking pins 33 will be in contact with the vertical surface of the primary telescopic frame 9. At this time, the round end 51 on each transverse locking pin 33 reduces the friction between it and the vertical surface of the primary telescopic frame 9.

[0069] Working principle:

[0070] First, a drill bit 6 of a specific length is selected according to the current drilling process requirements. After the drill bit 6 is installed on the drilling machine body 5, the multi-section telescopic frame is unfolded. During this process, the secondary telescopic frame 10 is extended first, and the secondary telescopic frame 10 is fixedly connected to the primary telescopic frame 9 through the locking mechanism. When locking, the first spring 32 in each columnar sleeve 31 is fully released, thereby pushing the convex ring 35 through the elastic force of the first spring 32, and thus causing the transverse locking pin 33 to extend into the corresponding locking hole 36. Finally, the primary telescopic frame 9 and the secondary telescopic frame 10 are fixed by the two transverse locking pins 33. Connect the first telescopic frame 9 and then slide the first telescopic frame 9 together with the second telescopic frame 10. After sliding the first telescopic frame 9 to the end of the curved nozzle 12 facing the end of the drill bit 6, the sliding limit mechanism restricts the sliding of the first telescopic frame 9. At this time, the first telescopic frame 9 and the second telescopic frame 10 are both in a fixed state. Then, fix the magnetic suction seat 1 to the metal workpiece to be drilled through the first magnetic suction part 3. The first magnetic suction part 3 is composed of several powerful electromagnets, and the magnetic suction seat 1 is equipped with a control switch 52 for synchronously switching on and off several powerful electromagnets.

[0071] Before drilling with drill bit 6, one end of the curved nozzle 12 can be connected to lubricating oil via a hose (not shown in the figure). This allows lubricating oil to be sprayed onto the end of drill bit 6 through the curved nozzle 12, reducing friction between drill bit 6 and the metal workpiece during drilling. Subsequently, the deceleration drive assembly controls the displacement of the drill body 5, thereby driving drill bit 6 to slowly advance towards the metal workpiece. During this process, the multi-section telescopic frame moves along with the drill body 5. The second magnetic attraction part 11 on the secondary telescopic frame 10 gradually approaches the metal workpiece until it contacts it, thus fixing one end of the secondary telescopic frame 10 to the metal workpiece via the second magnetic attraction part 11. As the secondary telescopic frame 10 moves towards the metal workpiece, the sliding rod 37 extends from one end of the secondary telescopic frame 10 and first contacts the metal workpiece. During this process, the other end of the sliding rod 37 moves towards the wedge block 41, at which point the first wedge surface 38 and the second wedge surface 42... With the wedge engagement, the wedge block 41 will drive the connecting vertical rod 39 to slide in the corresponding clearance groove 40, and the connecting vertical rod 39 will drive the two convex rings 35 to compress the first spring 32. At the same time, the two transverse locking pins 33 will retract into the corresponding columnar sleeves 31, thereby unlocking the secondary telescopic frame 10 from the primary telescopic frame 9. Then, when one end of the secondary telescopic frame 10 with the second magnetic suction part 11 is magnetically fixed to the metal workpiece, the movable secondary telescopic frame 10 will slide into the primary telescopic frame 9. When the secondary telescopic frame 10 is in the movable state, as the drill body 5 continues to advance, the secondary telescopic frame 10 will continuously slide in the primary telescopic frame 9 until the drill bit 6 completely enters the metal workpiece. When the drill bit 6 is drilling, one end of the bent nozzle 12 can be connected to high-pressure gas through a hose, so as to continuously spray air onto the drilling part through the bent nozzle 12 to prevent the debris generated during drilling from being followed by the drill bit 6 back into the drilling hole.

[0072] When the deceleration drive assembly controls the drill body 5 to move in the opposite direction, the first-stage telescopic frame 9 will drive the two pins 43 to slide in the opposite direction in the two strip grooves 44 respectively. At this time, since one end of the first-stage telescopic frame 9 is magnetically fixed to the metal workpiece, the first-stage telescopic frame 9 will not move until each pin 43 moves in the opposite direction to abut against one end of the strip groove 44, that is, when the drill bit 6 is completely pulled out of the borehole, the first-stage telescopic frame 9 will give the second-stage telescopic frame 10 a traction force. This traction force is greater than the magnetic attraction force between the second magnetic attraction part 11 and the metal workpiece. Thus, the first-stage telescopic frame 9 will be pulled by the second-stage telescopic frame 10 and reset in the opposite direction until the drill body 5 is reset to the initial state. During the process of the drill bit 6 being pulled out of the borehole, the debris attached to the entire drill bit 6 is blown away by the curved nozzle 12.

[0073] When the first-stage telescopic frame 9 moves in the reverse direction and drives the second-stage telescopic frame 10 to reset, the two transverse locking pins 33 are respectively aligned with the two locking holes 36 on the first-stage telescopic frame 9 and the second-stage telescopic frame 10. However, at this time, each transverse locking pin 33 is driven by the sliding rod 37 to be in a retracted state. Subsequently, the end of the sliding rod 37 that is in contact with the metal workpiece will gradually separate from the metal workpiece. During the process of the sliding rod 37 gradually separating from the metal workpiece, the reset force of the second spring 48 drives the sliding rod 37 to gradually reset, so that the end of the sliding rod 37 with the first wedge surface 38 gradually separates from the wedge block 41. At this time, the two transverse locking pins 33 in the retracted state will be inserted into the two locking holes 36 again, so that the first-stage telescopic frame 9 and the second-stage telescopic frame 10 are locked again.

[0074] Through the above steps, the relative position of the curved nozzle 12 to the end of the drill bit 6 does not change before and after drilling. When the drill bit 6 enters and exits the hole, the air jet from the curved nozzle 12 can act on the hole and the entire drill bit 6. This prevents debris from entering the hole when the drill bit 6 enters the hole. When exiting the hole, the curved nozzle 12 sprays air from the tail to the head onto the entire drill bit 6, thereby blowing away the debris attached to the drill bit 6.

[0075] The above embodiments only illustrate one or more implementations of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. A magnetic base drill for small-diameter deep holes, characterized in that, The system includes a magnetic suction base (1), a sliding drill (2), a speed reduction drive assembly, and an auxiliary telescopic support. The magnetic suction base (1) is generally elongated, with one end being a first magnetic suction part (3) for fixing the magnetic suction base (1) to a metal workpiece. The other end of the magnetic suction base (1) is provided with a handle (4). The sliding drill (2) includes a drill body (5) and a drill bit (6). The drill bit (6) is horizontally and detachably connected to the drill body (5). The drill body (5) is slidably connected to the top of the magnetic suction base (1). The speed reduction drive assembly is located on the magnetic suction base (1) and is used to drive the drill body (5) to slide slowly along the axial direction of the drill bit (6). The auxiliary telescopic support includes a multi-section telescopic frame, a sliding limit mechanism, a locking mechanism, an unlocking mechanism, and an elastic sleeve (7). The multi-section telescopic frame is located on the side of the drill body (5), and the telescopic direction of the multi-section telescopic frame is consistent with the forward direction of the drill bit (6). The multi-section telescopic frame includes a mechanism that can follow the direction of the drill bit (6). The drilling rig body (5) has a strip-shaped fixed frame (8) that moves together with it, a first-level telescopic frame (9) that slides in the strip-shaped fixed frame (8), and a second-level telescopic frame (10) that slides in the first-level telescopic frame (9). The sliding limit mechanism is used to limit the sliding of the first-level telescopic frame (9). The end of the second-level telescopic frame (10) is a second magnetic suction part (11) used to fix one end of the second-level telescopic frame (10) to the metal workpiece. The locking mechanism and the unlocking mechanism are both located in the second-level telescopic frame (10). The locking mechanism is used to connect the first-level telescopic frame (9) and the second-level telescopic frame (10). The unlocking mechanism is used to unlock the first-level telescopic frame (9) and the second-level telescopic frame (10) when the end of the second-level telescopic frame (10) comes into contact with the metal workpiece. The elastic sleeve (7) is fixedly located on the side of the second-level telescopic frame (10) near the drill bit (6). The elastic sleeve (7) has a bent nozzle (12) with one end facing the end of the drill bit (6) inside it. The locking mechanism includes a U-shaped connecting frame (30) fixed to the opening side of the secondary telescopic frame (10) and two sets of elastic locking pins symmetrically distributed in the U-shaped connecting frame (30). Each set of elastic locking pins includes a columnar sleeve (31), a first spring (32), and a transverse locking pin (33). The axial direction of the columnar sleeve (31) is perpendicular to the vertical surface of the secondary telescopic frame (10). One end of the columnar sleeve (31) is an open structure, and the other end is coaxially formed with a retaining ring (34). The open end of the columnar sleeve (31) is fixed to the vertical surface of the U-shaped connecting frame (30), and the transverse locking pin (33) coaxially passes through the retaining ring (34). One end of the transverse locking pin (33) is formed with a convex ring (35) that slides in the columnar sleeve (31). The first spring (32) is located in the columnar sleeve (31). The two ends of the first spring (32) abut against the end of the convex ring (35) and the vertical surface of the U-shaped connecting frame (30), respectively. Two locking holes (36) are opened on the vertical surfaces of the first-level telescopic frame (9) and the second-level telescopic frame (10), respectively corresponding to the two transverse locking pins (33). When locked, the other end of each transverse locking pin (33) passes through the corresponding locking holes (36) on the second-level telescopic frame (10) and the first-level telescopic frame (9) in sequence.

2. The magnetic base drill for small-diameter deep holes according to claim 1, characterized in that, The top of the magnetic suction base (1) is provided with a strip groove (13), the length direction of the strip groove (13) is consistent with the length direction of the magnetic suction base (1), a linear slide rail (14) is fixedly provided in the strip groove (13), a slider (15) is slidably provided on the linear slide rail (14), the movement direction of the slider (15) is consistent with the axis of the drill bit (6), and the drill body (5) is fixedly provided on the top of the slider (15).

3. A magnetic base drill for small-diameter deep holes according to claim 2, characterized in that, The speed reduction drive assembly includes a drive gear (16), a first gear (17), a second gear (18), a drive gear (19), a rack (20), and a motor (21). A mounting groove (22) is provided on the side wall of one side of the magnetic suction base (1). A mounting plate (23) covers the opening of the mounting groove (22). A vertical groove (24) connects the mounting groove (22) and the strip groove (13). The drive gear (16), the first gear (17), and the second gear (18) are all rotatably mounted within the mounting groove (22). The motor (21) is horizontally fixed on the side of the magnetic suction base (1) without the mounting plate (23). The drive gear (16) and the motor (21) are connected by a transmission line. The output ends are coaxially fixed. Gear No. 1 (17) and Gear No. 2 (18) are coaxially connected, and Gear No. 1 (17) meshes with the driving gear (16). The rack (20) is horizontally fixed at the bottom of the slider (15). The length direction of the rack (20) is consistent with the movement direction of the slider (15). The driving gear (19) is rotatably set in the vertical groove (24). The driving gear (19) is located between the rack (20) and Gear No. 2 (18), and the driving gear (19) meshes with Gear No. 2 (18) and rack (20). The diameter of Gear No. 1 (17) is larger than the diameter of the driving gear (16), and the diameter of the driving gear (19) is larger than the diameter of Gear No. 2 (18).

4. A magnetic base drill for small-diameter deep holes according to claim 2, characterized in that, The strip-shaped fixing frame (8), the first-stage telescopic frame (9), and the second-stage telescopic frame (10) are all U-shaped strips. The length direction of all three is parallel to the axis of the drill bit (6), and the opening side of all three is away from the drill bit (6). Among them, the strip-shaped fixing frame (8) is horizontal and is fixed to the top of the slider (15) through the connecting frame (25). The sliding limit mechanism includes a limit pin (26), a washer (27), and a fastening nut (28). A strip-shaped through groove (29) is opened on the vertical surface of the strip-shaped fixing frame (8). The length direction of the strip-shaped through groove (29) is parallel to the axis of the drill bit (6). (8) The length direction is consistent. The limiting pin (26) is fixed to the vertical surface of the first-level telescopic frame (9). The axial direction of the limiting pin (26) is perpendicular to the vertical surface of the first-level telescopic frame (9). One end of the limiting pin (26) passes through the strip groove (29). The end of the limiting pin (26) that passes through the strip groove (29) is the threaded end. The fastening nut (28) is screwed on the threaded end of the limiting pin (26). The washer (27) is sleeved on the protruding end of the limiting pin (26) and the washer (27) is located between the fastening nut (28) and the vertical surface of the strip fixed frame (8).

5. A magnetic base drill for small-diameter deep holes according to claim 1, characterized in that, The unlocking mechanism includes a sliding rod (37), the length direction of which is consistent with the length direction of the secondary telescopic frame (10). The sliding rod (37) slides on the vertical surface of the secondary telescopic frame (10) near its opening, and the sliding rod (37) is located between two transverse locking pins (33). The end of the sliding rod (37) facing the U-shaped connecting frame (30) is formed with a first inclined wedge surface (38). The other end of the sliding rod (37) passes through the second magnetic suction part (11) and extends out of the secondary telescopic frame (10). The two convex rings (35) are connected by a connecting vertical rod (39). Each columnar sleeve (31) is provided with a clearance groove (40) for the connecting vertical rod (39) to slide. An inclined wedge block (41) is formed in the middle of the connecting vertical rod (39). A second inclined wedge surface (42) is formed on the side of the inclined wedge block (41) facing the first inclined wedge surface (38). The first inclined wedge surface (38) and the second inclined wedge surface (42) are wedge-fitted.

6. A magnetic base drill for small-diameter deep holes according to claim 1, characterized in that, Two pins (43) are formed at the end of the first-level telescopic frame (9) near the second-level telescopic frame (10) and are symmetrically distributed vertically. The upper and lower surfaces of the second-level telescopic frame (10) that are in contact with the first-level telescopic frame (9) are provided with strip grooves (44). The length direction of the strip grooves (44) is consistent with the length direction of the second-level telescopic frame (10). The pins (43) located above are inserted downward into the corresponding strip grooves (44), and the pins (43) located below are inserted upward into the corresponding strip grooves (44). When the first-level telescopic frame (9) and the second-level telescopic frame (10) are fixed, each pin (43) is located in the end of the strip groove (44) near the first-level telescopic frame (9).

7. A magnetic base drill for small-diameter deep holes according to claim 6, characterized in that, A horizontal guide groove (45) is formed on the vertical surface of the secondary telescopic frame (10) near its opening. A sliding rod (37) is located in the guide groove (45). An elastic reset mechanism for driving the sliding rod (37) to reset is provided on the guide groove (45). The elastic reset mechanism includes a fixed plate (46), a limiting plate (47), and a second spring (48). A stop block (49) protruding towards the opening of the secondary telescopic frame (10) is formed on the sliding rod (37). The fixed plate (46) spans the guide groove (45) and is fixedly connected to the secondary telescopic frame (10). The fixed plate (46) and the stop block (49) move along the guide groove. The grooves (45) are spaced apart along their length. The fixed plate (46) near the sliding rod (37) has one end with a first inclined wedge surface (38). The second spring (48) is horizontally fixed between the fixed plate (46) and the abutment (49), and the two ends of the second spring (48) abut against the fixed plate (46) and the abutment (49) respectively. The limiting plate (47) slides on the guide groove (45), and the limiting plate (47) abuts against the side of the abutment (49) away from the fixed plate (46). The limiting plate (47) is locked to the guide groove (45) by two fastening bolts (50) distributed vertically.

8. A magnetic base drill for small-diameter deep holes according to claim 1, characterized in that, Each transverse locking pin (33) has a rounded end (51) facing one end of the first-level telescopic frame (9).

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