Adjustable self-fixing punching device for small diameter cylinders

Abstract

The application discloses an adjustable self-fixing drilling device for small-diameter cylinders, which comprises three parts of a fixed rod, a fixing device and an electric drill machine. The fixed rod is formed by welding three rectangular rods in sequence. The first section of the fixed rod comprises a handrail handle and a linear section of rectangular rod, and is in a T-shaped form. The upper surface of the second section of the rectangular rod is provided with a plurality of gear grooves, so that the fixing device can freely move on the gear grooves and be fixed. The end of the third section of the rectangular rod is in a circular arc shape, and the diameter of the circular arc is matched according to the cylinder to be drilled. The device effectively solves the problems that the drill bit of the electric drill machine is easy to slip, deviate and shake along the surface of the small-diameter cylinder when drilling, and that the drill machine cannot be effectively fixed for a long time and accurately positioned during the drilling process only by hand holding, and can significantly improve the working efficiency and safety of drilling.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of construction tools, in particular to an adjustable self-fixing drilling device for the surface of a small-diameter cylinder. BACKGROUND

[0002] During construction, drilling operations are often performed on the surface of small-diameter objects. During the drilling process, the drill bit of an electric drill machine is prone to slipping, running out of position, and shaking on the surface of a small-diameter object, which results in inaccurate drilling position, slotted holes, and enlarged holes. The running out of position of the drill bit can even cause safety accidents. This phenomenon is particularly evident on the surface of a small-diameter cylinder, because the contact area between the drill bit and the surface of the small-diameter cylinder is small, and the surface of the cylinder is smooth and unstable. Therefore, the electric drill is prone to slipping, running out of position, and shaking during the drilling operation.

[0003] During the conventional drilling operation of a handheld electric drill machine, the drill bit is first aligned with the desired drilling position, and then the electric drill machine is manually fixed so that the drill bit remains unchanged relative to the drilling position and performs drilling. Long-time drilling and operation on the surface of a small-diameter object can easily cause fatigue of the operator and the slipping, running out of position, and shaking of the drill bit. Therefore, a reliable adjustable self-fixing drilling device for the surface of a small-diameter cylinder is needed. SUMMARY

[0004] Therefore, in order to solve the above problems, the present application provides an adjustable self-fixing drilling device for the surface of a small-diameter cylinder. The device can effectively temporarily fix the electric drill machine on the surface of a small-diameter cylinder, so that the electric drill machine does not slip, run out of position, or shake relative to the drilling position, ensuring the stability and safety of the drilling operation of the electric drill machine and ensuring the accuracy of the drilling position. In addition, the device replaces the manual fixing of the electric drill machine during the drilling operation of a handheld electric drill, effectively saving manpower and further improving work efficiency.

[0005] The present application is implemented by constructing an adjustable self-fixing drilling device for a small-diameter cylinder, which comprises three parts: an end-arc-shaped and middle-gear-groove rectangular fixing rod, a fixing device that can freely move on the fixing rod and be locked, and an electric drill machine. The rectangular fixing rod comprises a T-shaped rectangular rod with a handrail handle and a straight segment, a straight-segment rectangular rod with an upper surface gear groove, and an end-arc-shaped rectangular rod. The fixing device comprises a handrail handle cross rod, a handrail handle vertical rod, a U-shaped groove, a bolt A, a bolt B, a circular gear, a rectangular groove, a fixing plate, a U-shaped clamp, a gear groove clamping device, and a fixing spring.

[0006] The adjustable self-fixing punching device for small-diameter cylinder is characterized in that the rectangular fixed rod is welded by three sections in sequence, including a T-shaped rectangular rod with a handle and a straight section, a straight rectangular rod with gear grooves arranged on the upper surface in a certain range, and a circular-arc+straight section rectangular rod with an end matched with the diameter of the cylinder; the three sections of the rectangular rod are welded in sequence to form a whole fixed rod, and the length of the fixed rod can be lengthened or shortened according to the actual needs of the operator.

[0007] The adjustable self-fixing punching device for small-diameter cylinder is characterized in that the fixed device for free walking on the fixed rod is welded by the cross rod of the handle, the vertical rod of the handle and the upper surface of the U-shaped groove; two pairs of circular fixing holes are symmetrically arranged on the two sides of the U-shaped groove.

[0008] The hollow rectangular hole is arranged through the length direction of the rectangular groove, the thickness of the hole wall is about 5mm, and the inner diameter is matched with the outer diameter of the aforementioned rectangular fixed rod; the rectangular hole is arranged on the upper side wall of the rectangular groove, and the inner diameter of the rectangular hole is matched with the width of the gear groove on the upper surface of the aforementioned fixed rod; the connecting ear is arranged on the upper surface of the two side walls of the rectangular groove in the middle, the connecting ear is in the form of rectangular+half circle, the through hole is arranged at the center of the half circle wall, the middle section rectangular fixed rod with the gear groove passes through the hollow inner diameter of the rectangular groove, and one side of the rectangular groove side wall provided with the rectangular hole faces upward.

[0009] The adjustable self-fixing punching device for small-diameter cylinder is characterized in that the connecting ear of the rectangular groove is clamped and fixed to the inner diameter of the U-shaped groove, the center of the through hole at the center of the half circle side wall of the connecting ear of the rectangular groove is aligned with the circular fixing hole at the lower part of the side wall of the U-shaped groove, and the connecting ear of the rectangular groove is fixed to the inner diameter of the U-shaped groove by the pin B. The bolt B is fixed .

[0010] The adjustable self-fixing punching device for small-diameter cylinder is characterized in that the diameter and width of the circular gear are matched with the inner diameter of the U-shaped groove, the center of the circular gear is provided with a through hole, the size of the gear on the circumference of the circular gear is matched with the gear groove on the upper surface of the aforementioned middle section rectangular fixed rod, the circular gear is embedded in the inner diameter space position of the U-shaped groove, the gear on the circumference of the circular gear is seamlessly engaged with the gear groove on the upper surface of the rectangular fixed rod, the circular fixing hole at the lower part of the side wall of the U-shaped groove is aligned with the through hole of the circular gear, and the fixing is performed by the pin B.

[0011] The adjustable self-fixing punching device for small-diameter cylinder is characterized in that the end of the gear groove clamping device has a flange on the lower surface of the protruding rectangular block, the size of the flange is matched with the size of the gear on the circumference of the circular gear, and the other end of the gear groove clamping device is provided with an upper and lower through rectangular groove, the thickness of the side wall of the rectangular groove is 5mm, and the through hole is arranged at the upper corner position of the side wall of the rectangular groove.

[0012] The adjustable self-fixing punching device for small-diameter cylinders according to the present application is characterized in that the gear slot clamping device is embedded in the upper position of the inner diameter space of the U-shaped slot, the through-hole on the upper corner of the side wall of the gear slot clamping device is aligned with the circular fixing hole on the upper side wall of the U-shaped slot, and is fixed by the bolt A; the flange on the lower surface of the gear slot clamping device is embedded between the circumferential gears of the circular gear.

[0013] The adjustable self-fixing punching device for small-diameter cylinders according to the present application is characterized in that the circular fixing hole of the U-shaped slot is aligned with the through-hole of the gear slot clamping device, and is fixed by the bolt A. Meanwhile, the fixed spring is installed in the range of the rectangular slot bolt space through the U-shaped slot, and the two ends of the fixed spring are fixed to the upper surface of the U-shaped slot and the upper surface of the rectangular block of the gear slot clamping device, respectively. The connection and elastic effect of the fixed spring and the bolt A can effectively connect the U-shaped slot, the circular gear, and the gear slot clamping device into a whole. Pushing the handle crossbar of the U-shaped slot forward can make the flange of the gear slot clamping device clamped in the gear gap of the circular gear, and the gear of the circular gear and the gear slot of the rectangular slot will also be clamped at the same time. Pushing the handle crossbar of the U-shaped slot backward can make the flange of the gear slot clamping device disengage from the gears of the circular gear, and the gear of the circular gear and the gear slot of the rectangular slot will also no longer be clamped at the same time. At this time, the rectangular slot can be freely moved to the designated position along the rectangular fixed rod.

[0014] The adjustable self-fixing punching device for small-diameter cylinders according to the present application is characterized in that the fixed plate is welded to the lower surface of the rectangular slot; the thickness of the fixed plate is 5mm, and circular holes are symmetrically arranged at the four corners; the electric drill machine passes through the four corner circular holes of the fixed plate using a U-shaped clamp, the end of the U-shaped clamp is provided with a screw thread, and is fixed by a nut; the size of the U-shaped clamp matches the size of the electric drill machine.

[0015] The adjustable self-fixing punching device for small-diameter cylinders according to the present application is characterized in that the circular arc end of the rectangular fixed rod is fixed to the designated position on the surface of the small-diameter cylinder, the electric drill machine is connected to the fixed plate at the lower part of the rectangular slot through the U-shaped clamp, the entire rectangular slot is pushed forward through the handle at the upper part of the U-shaped slot, the drill bit of the electric drill machine contacts the surface of the small-diameter cylinder, the crossbar of the handle is pushed forward, and the flange of the gear slot clamping device seamlessly engages with the circumferential gears of the circular gear, the circular gear, and the gear slot on the upper surface of the rectangular fixed rod. The position of the entire rectangular slot and the electric drill machine relative to the rectangular fixed rod is temporarily fixed and kept relatively unchanged, the drill bit of the electric drill machine is used to punch the small-diameter cylinder, and the drill bit relative to the surface of the cylinder will not slip, run out of position, or shake.

[0016] The application has the advantages that the application discloses an adjustable self-fixing punching device for small-diameter cylinders, which comprises three parts of a fixed rod with a circular arc-shaped end, a fixing device capable of freely moving on the fixed rod and being locked, and an electric drill machine. The fixed rod is sequentially welded by three rectangular rods, the first section of which comprises a handrail handle and a straight-line section of rectangular rod, in a T-shaped form; the second section of rectangular rod has a plurality of gear grooves on the upper surface, for the fixing device to freely move on the gear grooves and be fixed; the end of the third section of rectangular rod is in a circular arc shape, and the diameter of the circular arc is matched according to the cylinder to be punched. The fixing device comprises an internal hollow rectangular groove capable of freely moving along the rectangular rod, a circular gear, a gear groove clamping device, a fixing spring, a bolt, a fixed plate, a handle, and a U-shaped hoop. The electric drill machine is selected according to actual needs and is connected to the fixed plate directly below the rectangular groove through the U-shaped hoop. The parts of the application can be manufactured by a factory through welding and assembly. In the specific punching operation, the circular arc end of the fixed rod is fixed at a specified surface position of the small-diameter cylinder, the fixing device is moved to the corresponding position along the axial direction on the rectangular rod with the gear groove in the middle section, and then is temporarily fixed through the gear groove clamping device, and the drill bit of the electric drill machine drills a hole on the surface of the small-diameter cylinder. The device effectively solves the problems that the drill bit of the electric drill machine easily slips, deviates, and shakes along the surface of the small-diameter cylinder when drilling a hole on the surface of the small-diameter cylinder, and that the drill machine cannot be effectively fixed for a long time and accurately positioned during the drilling process by only holding it by hand, and can significantly improve the work efficiency and safety of drilling. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a structural schematic diagram of the application;

[0018] Figure 2 is a schematic diagram of the free movement of the rectangular groove relative to the rectangular fixed rod gear;

[0019] Figure 3 is a schematic diagram of the rectangular fixed rod;

[0020] Figure 4 is a schematic diagram of the U-shaped groove and the upper handle;

[0021] Figure 5 is a schematic diagram of the bolt;

[0022] Figure 6 is a schematic diagram of the circular gear;

[0023] Figure 7 is a schematic diagram of the rectangular groove;

[0024] Figure 8 is a schematic diagram of the fixed plate;

[0025] Figure 9 is a schematic diagram of the U-shaped hoop;

[0026] Figure 10 It is a schematic diagram of an electric drill;

[0027] Figure 11 Schematic diagram of the gear groove locking device;

[0028] Figure 12 It is a schematic diagram of the fixed spring;

[0029] Figure 13 It is a schematic diagram of a small diameter cylinder.

[0030] Among them: a T-shaped rectangular rod 1 for the handrail and the straight section, a straight section rectangular rod 2 for the gear groove on the upper surface, a rectangular rod 3 with an arc-shaped end, a handrail crossbar 4, a handrail vertical rod 5, a U-shaped groove 6, a latch A 7, a latch B 8, a circular gear 9, a rectangular groove 10, a fixing plate 11, a U-shaped clamp 12, a gear groove locking device 14, a fixing spring 15, an electric drill 13, and a small-diameter cylinder 16. DETAILED DESCRIPTION

[0031] The following will be combined with the Figures 1-13 The present invention is described in detail, and the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0032] The present invention provides an improved, adjustable, self-fixing drilling device for small-diameter cylindrical surfaces. This device effectively temporarily secures an electric drill to the surface of the small-diameter cylinder, preventing the drill from slipping, moving, or shaking relative to the drilling position. This ensures stable and safe drilling operations and precise hole placement. Furthermore, the fixing plate secures the drill, replacing the manual fixation required for handheld drilling with a handheld drill, effectively saving manpower and further improving work efficiency.

[0033] like Figures 1-13 As shown, an embodiment of the present invention is as follows: an adjustable, self-fixing drilling device for the surface of a small-diameter cylindrical object, comprising three major parts: a rectangular fixing rod with an arc-shaped end and a gear groove in the middle; a fixing device that can move freely on the fixing rod and lock it; and an electric drill. The rectangular fixing rod comprises: a T-shaped rectangular rod 1 with a handgrip and a straight section; a straight section rectangular rod 2 with a gear groove on its upper surface; and a rectangular rod 3 with an arc-shaped end. The fixing device comprises a handgrip crossbar 4, a handgrip vertical rod 5, a U-shaped groove 6, a latch A7, a latch B8, a circular gear 9, a rectangular groove 10, a fixing plate 11, a U-shaped clamp 12, a gear groove locking device 14, and a fixing spring 15.

[0034] When the present application is implemented, the rectangular fixed rod is welded by three sections in turn, including T-shaped rectangular rod 1 with handle and straight section, straight rectangular rod 2 with gear groove arranged on the upper surface in a certain range, and arc+straight section rectangular rod 3 matched with the diameter of the cylinder at the end, the three sections of rectangular rods are welded in turn to form a whole fixed rod, and the length of the fixed rod can be lengthened or shortened according to the actual needs of the operator.

[0035] When the present application is implemented, the fixed device for free walking on the fixed rod is welded by the handle cross rod 4, the handle vertical rod 5 and the upper surface of the U-shaped groove 6. Two pairs of circular fixing holes are symmetrically arranged on the upper and lower sides of the two sides of the U-shaped groove 6.

[0036] When the present application is implemented, the rectangular groove 10 is provided with a through hollow rectangular hole in the length direction, the thickness of the hole wall is about 5mm, and the inner diameter is matched with the outer diameter of the aforementioned rectangular fixed rod. The upper surface of the rectangular groove 10 is provided with a rectangular hole, and the inner diameter of the rectangular hole is matched with the width of the gear groove on the upper surface of the middle section of the fixed rod. The upper surface of the two side walls of the rectangular groove 10 is provided with a connecting ear in the middle position, the connecting ear is rectangular+semicircular, and a through circular hole is arranged at the center position of the semicircular wall.

[0037] When the present application is implemented, the middle section rectangular fixed rod of the gear groove passes through the hollow inner diameter of the rectangular groove 10, and one side of the rectangular hole provided on the side wall of the rectangular groove 10 faces upward.

[0038] When the present application is implemented, the outer edge of the connecting ear of the rectangular groove 10 is clamped in the inner diameter of the U-shaped groove 6, the through circular hole at the center of the semicircular side wall of the connecting ear of the rectangular groove 10 is aligned with the circular fixing hole at the lower part of the side wall of the U-shaped groove 6, and the connecting ear is fixed by the pin B8. The bolt B8 is fixed ​ .

[0039] When the present application is implemented, the diameter and width of the circular gear 9 are matched with the inner diameter of the U-shaped groove 6, and the center of the circular gear is provided with a through circular hole; the size of the gear on the circumference of the circular gear 9 is matched with the gear groove on the upper surface of the aforementioned middle section rectangular fixed rod; the circular gear 9 is embedded in the inner diameter space position of the U-shaped groove 6, and the gear on the circumference is seamlessly engaged with the gear groove on the upper surface of the rectangular fixed rod; the through circular hole of the circular gear 9 is aligned with the through circular hole of the connecting ear of the rectangular groove 10, and the connecting ear is fixed by the pin B8.

[0040] The end of the gear slot clamping device 14 has a protruding rectangular block flange on the lower surface, and the size of the flange matches the circumferential gear of the circular gear 9. The other end of the gear slot clamping device 14 is provided with an upper and lower through rectangular slot, and the thickness of the side wall of the rectangular slot is about 5mm. The through hole is arranged at the upper corner position of the side wall of the rectangular slot. The gear slot clamping device 14 is embedded in the inner diameter space of the upper position of the U-shaped groove 6, and the through hole at the upper corner position of the side wall of the gear slot clamping device 14 is aligned with the circular fixing hole at the upper side wall of the U-shaped groove 6, and is fixed by the bolt A7; the flange on the lower surface of the gear slot clamping device 14 is embedded between the circumferential gears of the circular gear 9.

[0041] When the application is implemented; the circular fixing hole of the U-shaped groove 6 is aligned with the through hole of the gear slot clamping device 14, and is fixed by the bolt A7. The fixed spring 15 is installed in the range of the rectangular slot plug-in space at the left end of the gear slot clamping device 14, and the two ends of the fixed spring are fixed to the upper surface of the U-shaped groove 6 and the upper surface of the rectangular block of the gear slot clamping device 14 respectively. The connection and elastic effect of the fixed spring 15 and the bolt A7 can effectively connect the U-shaped groove 6, the circular gear 9 and the gear slot clamping device 14 into a whole. Pushing the U-shaped groove 6 forward, the flange of the gear slot clamping device 14 is clamped in the gear gap of the circular gear 9, and the gear slot of the circular gear 9 and the rectangular slot 10 is also clamped synchronously. Pushing the U-shaped groove 6 backward, the flange of the gear slot clamping device 14 is separated from the gear gap of the circular gear 9, and the gear slot of the circular gear 9 and the rectangular slot 10 no longer clamps synchronously. The rectangular slot 10 can be freely moved to the specified position along the rectangular fixed rod.

[0042] When the application is implemented; the fixed plate 11 is welded below the rectangular slot 10, and the thickness is about 5mm. Four corner symmetrical circular holes are arranged. The electric drill machine 13 passes through the four circular holes of the corner of the fixed plate 11 by the U-shaped hoop 12, the end of the hoop is provided with a screw thread, and is fixed by a nut. The size of the U-shaped hoop matches the size of the selected electric drill machine. When the application is implemented; the end of the rectangular fixed rod is fixed to the surface of the small diameter cylinder 16 at a specified position, and the electric drill machine is connected to the fixed plate below the rectangular slot by the U-shaped hoop. The rectangular slot is pushed forward by the upper handle of the U-shaped groove, and the drill bit of the electric drill machine contacts the surface of the small diameter cylinder. The handle crossbar is pushed forward, the flange of the gear slot clamping device 14 is engaged with the gear of the circular gear 9, the circular gear 9 and the gear on the upper surface of the rectangular fixed rod.

[0043] The present application is through pushing the handlebar crossbar 4 of the U-shaped groove 6, using the elastic effect of the fixed spring 15 to fix the flange of the gear slot clamping device 14 in the gear gap of the circular gear 9, and the synchronous circular gear 9 and the gear slot of the rectangular groove 10 will also be clamped. The entire rectangular groove and the electric drill machine are temporarily fixed relative to the position of the rectangular fixed rod and remain unchanged, and the electric drill machine drills the small diameter cylinder. The drill bit does not slip and shake relative to the surface of the cylinder. After drilling, push the handlebar crossbar 4 of the U-shaped groove 6 backward to make the flange of the gear slot clamping device 14 disengage from the gear gap of the circular gear 9, and the synchronous circular gear 9 and the gear of the rectangular groove 10 will no longer be clamped. At this time, the rectangular groove can be freely moved to the specified position along the rectangular fixed rod.

[0044] In summary, the present application provides an adjustable self-fixing drilling device for the surface of a small diameter cylinder, which includes a rectangular fixed rod with a circular arc-shaped end and a gear slot in the middle, a fixing device that can freely walk on the fixed rod and be locked, and an electric drill machine. When in use, first fix the front circular arc end of the rectangular fixed rod to the specified position on the surface of the cylinder, hold the handle at the rear of the rectangular fixed rod with the left hand, and slightly pull the handlebar crossbar 4 of the U-shaped groove 6 with the right hand. The flange of the gear slot clamping device 14 disengages from the gear gap of the circular gear 9, and the synchronous circular gear 9 and the gear of the rectangular groove 10 will no longer be clamped. At this time, the rectangular groove is freely moved to the surface of the cylinder contacted by the drill bit of the electric drill machine along the axis of the rectangular fixed rod through the mutual transmission of the circular gear and the gear on the upper surface of the rectangular fixed rod. Push the handlebar crossbar 4 of the U-shaped groove 6 forward, and use the elastic effect of the fixed spring 15 to fix the flange of the gear slot clamping device 14 in the gear gap of the circular gear 9. The synchronous circular gear 9 and the gear of the rectangular groove 10 will also be temporarily clamped. The flange of the gear slot clamping device caused by the elastic effect of the circular arc at the front end of the rectangular fixed rod, the handle at the rear end, and the fixed spring is embedded and fixed, and the three work together to temporarily fix the electric drill machine. The electric drill machine can perform drilling operation, and the drill bit and the surface of the small diameter cylinder will not slip, shift, and shake during the operation.

[0045] The above description of disclosed embodiments enables one of ordinary skill in the art to make or use the application. Various modifications to these embodiments will be readily apparent to those of ordinary skill in the art, and the generic principles defined herein can be applied to other embodiments without departing from the spirit or scope of the application. Therefore, the application is not to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An adjustable self-fixing hole punching device for small diameter cylinders, characterized by: The device comprises three parts: a rectangular fixed rod with arc-shaped end and gear slot, a fixing device capable of freely moving and locking on the fixed rod, and an electric drill; the rectangular fixed rod comprises a T-shaped rectangular rod with handrail handle and straight line segment (1), a straight line segment rectangular rod with upper surface gear slot (2), and a rectangular rod with arc-shaped end (3); the fixing device comprises a handrail handle cross bar (4), a handrail handle vertical rod (5), a U-shaped slot (6), a bolt A (7), a bolt B (8), a circular gear (9), a rectangular slot (10), a fixed plate (11), a U-shaped clamp (12), a gear slot clamping device (14), and a fixed spring (15); The rectangular fixed rod is welded by three segments in sequence, the T-shaped rectangular rod with handrail handle and straight line segment (1), the straight line segment rectangular rod with gear slot on the upper surface (2), and the arc-shaped + straight line segment rectangular rod with end matched with the diameter of a cylinder (3); the three segments of the rectangular rod are welded in sequence to form a whole fixed rod, and the length of the fixed rod can be lengthened or shortened according to the actual needs of the operator; The fixing device capable of freely moving on the fixed rod is welded by the handrail handle cross bar (4), the handrail handle vertical rod (5), and the upper surface of the U-shaped slot (6); two pairs of circular fixing holes are symmetrically arranged on the upper and lower surfaces of the two side surfaces of the U-shaped slot (6); The rectangular slot (10) is provided with a hollow rectangular hole penetrating along the length direction, the thickness of the hole wall is 5mm, and the inner diameter is matched with the outer diameter of the aforementioned rectangular fixed rod; the upper side wall of the rectangular slot (10) is provided with a rectangular hole, and the inner diameter of the rectangular hole is matched with the width of the gear slot on the upper surface of the aforementioned fixed rod; the upper surface of the two side walls of the rectangular slot (10) is provided with a connecting ear in the middle, the connecting ear is in the form of rectangular + semicircle, and a through circular hole is arranged at the center of the semicircle wall; The middle segment rectangular fixed rod with gear slot penetrates through the hollow inner diameter of the rectangular slot (10), and the side wall of the rectangular slot (10) is provided with a rectangular hole facing upward; The outer edge of the connecting ear of the rectangular slot (10) is clamped in the inner diameter of the U-shaped slot (6), the circular fixing hole in the lower part of the side wall of the U-shaped slot (6) is aligned with the center of the through circular hole in the semicircle side wall of the connecting ear of the rectangular slot (10), and the bolt B (8) is used for fixing; The diameter and width of the circular gear (9) are matched with the inner diameter of the U-shaped slot (6), and the center of the circular gear is provided with a through circular hole; the size of the gear on the circumference of the circular gear (9) is matched with the gear slot on the upper surface of the aforementioned middle segment rectangular fixed rod; the circular gear (9) is embedded in the inner diameter space position of the U-shaped slot (6), and the gear on the circumference thereof is seamlessly engaged with the gear slot on the upper surface of the rectangular fixed rod; the through circular hole of the circular gear (9) is aligned with the circular fixing hole in the lower part of the side wall of the U-shaped slot (6), and the bolt B (8) is used for fixing; The end of the gear slot clamping device (14) has a flange on the lower surface of a protruding rectangular block, and the size of the flange is matched with the size of the gear on the circumference of the circular gear (9); the other end of the gear slot clamping device (14) is provided with a through rectangular slot, the thickness of the side wall of the rectangular slot is 5mm, and a through circular hole is arranged at the upper corner position of the side wall of the rectangular slot; Gear slot locking device (14) is embedded in the inner diameter space of U-shaped groove (6) upper position, the through hole in the corner of gear slot locking device (14) is aligned with the circular fixed hole in the upper wall of U-shaped groove (6), and is fixed by inserting pin A (7); the flange on the lower surface of gear slot locking device (14) is embedded between the circumferential gear of circular gear (9); The circular fixed hole of U-shaped groove (6) is aligned with the through hole of gear slot locking device (14), and is fixed by inserting pin A (7); Meanwhile, the fixed spring (15) is installed in the rectangular slot inserting space range through the upper and lower through holes of gear slot locking device (14), and the two ends of the fixed spring are fixed on the upper surface of U-shaped groove (6) and the upper surface of rectangular block of gear slot locking device (14) respectively; The connection and elastic effect of fixed spring (15) and inserting pin A (7) can effectively connect U-shaped groove (6), circular gear (9) and gear slot locking device (14) as a whole; Pushing the handle crossbar (4) of U-shaped groove (6) forward can make the flange of gear slot locking device (14) clamped in the gear gap of circular gear (9), and the gear of circular gear (9) and the gear slot of rectangular groove (10) will also be clamped at the same time; pushing the handle crossbar (4) of U-shaped groove (6) backward can make the flange of gear slot locking device (14) separate from the gear of circular gear (9), and the gear of circular gear (9) and the gear slot of rectangular groove (10) will also not produce clamping effect at the same time, at this time, the rectangular groove (10) can be freely moved to the specified position along the rectangular fixed rod; The fixed plate (11) is welded on the lower surface of the rectangular groove (10); the thickness of the fixed plate is 5mm, and the four corners are symmetrically provided with circular holes; the electric drill machine (13) passes through the four corner circular holes of the fixed plate (11) by using the U-shaped clamp (12), the end of the U-shaped clamp is provided with screw thread, and is fixed by using nut; the size of the U-shaped clamp matches the size of the used electric drill machine; The circular arc end of the rectangular fixed rod is fixed on the surface of the small diameter cylinder (16) at the specified position, the electric drill machine is connected to the fixed plate at the lower part of the rectangular groove through the U-shaped clamp, the entire rectangular groove is pushed forward through the handle at the upper part of the U-shaped groove, the drill bit of the electric drill machine contacts the surface of the small diameter cylinder, the handle crossbar is pushed forward, the flange of the gear slot locking device (14) is seamlessly engaged with the circumferential gear of the circular gear (9), the circular gear (9) and the gear slot on the upper surface of the rectangular fixed rod; The position of the entire rectangular groove and the electric drill machine relative to the rectangular fixed rod is temporarily fixed and kept relatively unchanged, the drill bit of the electric drill machine is used to drill the small diameter cylinder, and the drill bit relative to the surface of the cylinder will not slip, run out of position and shake.

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