A reliable positioning auxiliary device for electric drill bits

Abstract

This invention discloses a reliable positioning auxiliary device for electric drill bits, comprising: a base plate, a fixing mechanism, and a positioning adjustment mechanism; a clamping mechanism, arranged above the positioning adjustment mechanism, comprising: a clamping sleeve, which is axially divided into a smooth section, a central shaft section, and a threaded section, wherein the central shaft section and the threaded section have three continuous irregular holes symmetrically distributed along the central axis of the clamping sleeve, and the irregular holes form openings at the outer ends of the threaded sections; a clamping head, which forms a radial sliding fit with the irregular holes, wherein the clamping side of the clamping head is located inside the clamping sleeve and is an arc surface, and the outer side of the clamping head is a ramp surface, with the outermost end of the ramp surface located near the central shaft section of the ring sleeve; and a clamping nut, which is threadedly connected to the clamping sleeve, and by rotating the clamping nut, the clamping head can be pushed to slide in the radial direction to provide clamping force on the drill bit. This invention can improve the stability of the drilling direction and prevent bending deformation of thinner drill bits during drilling.

Description

Technical Field

[0001] This invention relates to the field of drilling equipment technology, and more specifically to a reliable positioning auxiliary device for electric drill bits. Background Technology

[0002] In daily life and production, there are many situations where drilling is required on working surfaces such as parts, walls, and wood. When using a hand-held electric drill, several disadvantages arise. First, because the drill is held in the hand, the drill bit axis is not perpendicular to the drilling surface, resulting in a tilted hole, which is unfavorable for subsequent drilling of threaded holes or other positioning and connection work. Second, due to the relatively long drill bit, the smooth surface to be drilled, and lack of operator skill, drilling position deviations can occur, failing to achieve precise positioning. Third, when drilling on a thin-walled surface, hand-held drilling may result in a non-circular hole. This is because hand tremors during drilling or bending and deformation of the drill bit due to its length or thinness can cause a non-circular hole. From the above, it can be seen that hand-held electric drills have disadvantages such as poor positioning accuracy, easy hole tilting, difficulty in control, and inconvenience in operation.

[0003] In view of this, it is necessary to improve the existing electric drill technology to solve the above problems. Summary of the Invention

[0004] The purpose of this invention is to disclose a reliable positioning auxiliary device for electric drill bits, so as to solve the above-mentioned technical problems, realize the reliable positioning of the electric drill bit held by hand, free up the hands, improve the stability of controlling the drilling direction, and avoid bending and deformation of thinner drill bits during drilling.

[0005] To achieve the above objectives, the present invention provides a reliable positioning auxiliary device for electric drill bits, comprising:

[0006] The base plate has a rectangular through hole in the center;

[0007] A fixing mechanism is used to fix the base plate to the surface of the workpiece being processed;

[0008] The positioning and adjustment mechanism is fixed on the base plate and includes a support plate and an X-axis sliding assembly and a Y-axis sliding assembly arranged on the base plate. It is used to adjust the position of the support plate. The support plate has a circular through hole for the drill bit to pass through.

[0009] A clamping mechanism, arranged above the positioning and adjustment mechanism, includes:

[0010] A clamping sleeve has three connected annular sections with different shaft diameters. It is divided along the axial direction into a smooth section, a central shaft section, and a threaded section. The central shaft section and the threaded section are provided with at least three irregular holes that are continuous and symmetrically distributed along the central axis of the clamping sleeve. The irregular holes have openings at the outer ends of the threaded sections.

[0011] Clamping heads are provided in accordance with the number of irregular holes and are respectively radially slidingly engaged with the irregular holes. The clamping side of the clamping head is located inside the clamping sleeve and is an arc surface. The outer side of the clamping head is a ramp surface. The outermost end of the ramp surface is arranged close to the central axis section of the ring sleeve.

[0012] A clamping nut is threadedly connected to the clamping sleeve. By rotating the clamping nut, the clamping head can be pushed to slide in the radial direction to provide clamping force on the drill bit.

[0013] A reset mechanism is also provided between the clamping head and the clamping sleeve, which is used to drive the clamping head to reset after the clamping nut removes its limiting effect on the clamping head;

[0014] An axial feed mechanism is arranged on the support plate and located outside the clamping mechanism. It is used to drive the clamping mechanism to move the drill bit axially and provide a feed depth for the drill bit to drill.

[0015] As a further improvement of the present invention, the irregular hole includes a dovetail hole located on the central shaft section and a rectangular hole located on the threaded section.

[0016] As a further improvement of the present invention, the clamping head includes a dovetail block that mates with the dovetail hole and a trapezoidal block that mates with the rectangular hole. The horizontal end face of the dovetail block has a rectangular groove formed radially. The reset mechanism includes:

[0017] The first limiting rod is fixed to the clamping sleeve.

[0018] The second limiting rod is fixed inside the rectangular groove, and the first limiting rod and the second limiting rod are distributed opposite each other at both ends of the rectangular groove.

[0019] A reset spring is arranged in the rectangular groove, and its two ends are respectively fixed to the first limiting rod and the second limiting rod.

[0020] As a further improvement of the present invention, an upward-facing stepped surface is formed between the smooth section and the central shaft section, and the axial feed mechanism includes:

[0021] Multiple sets of sliding rods are vertically arranged on the support plate and symmetrically distributed about the central axis of the clamping sleeve. The outer wall of the sliding rod is threaded near the top.

[0022] A bearing sleeve is arranged on the stepped surface, and the bearing sleeve and the smooth section are fastened together by a first bearing. Several fixing blocks are fixedly provided on the outer side of the bearing sleeve along the circumferential direction. The fixing blocks are slidably engaged with the slide rod by having sliding holes.

[0023] A compression spring is sleeved on a slide rod between the fixed block and the support plate;

[0024] A limiting nut is threadedly connected to the slide rod.

[0025] As a further improvement of the present invention, a guide mechanism disposed on the support plate is also included for providing guide and limit for the stroke of the drill bit tip, comprising:

[0026] A bearing housing is fixedly fitted inside the circular through hole, and a limiting ring is provided at the bottom of the bearing housing;

[0027] An angular contact bearing is placed in the bearing housing bore and axially positioned by the limiting ring. The angular contact bearing is interference-fitted with the bearing housing.

[0028] The guide block, arranged inside the angular contact bearing, has a tubular structure and extends outward at the top to form an overlapping portion for overlapping the top of the angular contact bearing. The guide block slides in conjunction with the drill bit.

[0029] As a further improvement of the present invention, the inner arc surface of the clamping head is provided with a plurality of horizontal grooves arranged at vertical intervals.

[0030] As a further improvement of the present invention, the top opening of the guide block is provided with a tapered chamfer.

[0031] As a further improvement of the present invention, a plurality of mounting holes are provided on one side of the base plate, and the fixing mechanism includes:

[0032] The clamping plate is arranged parallel to the bottom plate and has multiple assembly holes that align with the mounting holes.

[0033] The bolt is coaxially inserted through the mounting hole and assembly hole, and has a tightening nut at both ends.

[0034] Compared with existing technologies, the beneficial effects of this invention are as follows: A reliable positioning auxiliary device for electric drill bits achieves reliable positioning of the drill bit held by hand. The positioning adjustment mechanism allows for precise adjustment of the drilling position. The clamping mechanism prevents hand tremors from altering the drilling position or causing other effects. The axial feed mechanism allows the drill bit to move freely along the axial direction, freeing the hand from controlling the stability of the drilling direction. Combined with the guiding mechanism, it prevents bending and deformation of thinner drill bits due to excessive length. The guiding mechanism incorporates angular contact bearings, allowing the rotating head and guide block to rotate together, preventing drill bit wear. Furthermore, the guide block is replaceable, allowing for replacement according to the drill bit size, thus expanding its application range. In summary, this device has advantages such as reliable positioning, wide applicability, and convenient operation. Attached Figure Description

[0035] Figure 1 This is a three-dimensional structural schematic diagram of a reliable positioning auxiliary device for electric drill bits according to the present invention;

[0036] Figure 2 This is an exploded view of a reliable positioning auxiliary device for a hand drill bit according to the present invention;

[0037] Figure 3 This is a schematic diagram of the cooperation between the clamping sleeve, the clamping head, and the clamping nut in a reliable positioning auxiliary device for electric drill bits according to the present invention. Part of the reset mechanism is also shown in the figure.

[0038] Figure 4 This is a schematic diagram showing the positional relationship between the clamping head and the reset mechanism in a reliable positioning auxiliary device for electric drill bits according to the present invention.

[0039] In the diagram: a) Drill bit; 1) Base plate; 10) Rectangular through hole; 21) Clamping plate; 22) Bolt; 23) Tightening nut; 31) Support plate; 32) X-axis sliding assembly; 33) Y-axis sliding assembly; 41) Clamping sleeve; 42) Clamping head; 43) Clamping nut; 411) Smooth section; 412) Central shaft section; 413) Threaded section; 410) Irregular hole; 420) Rectangular groove; 4112) Stepped surface; 4200) Horizontal groove; 5) Reset mechanism; 51) First limit rod; 52) Second limit rod; 53) Reset spring; 61) Slide rod; 62) Compression spring; 63) Limiting nut; 64) Bearing sleeve; 65) First bearing; 641) Fixing block; 7) Guide mechanism; 71) Bearing seat; 72) Angular contact bearing; 73) Guide block. Detailed Implementation

[0040] The present invention will be described in detail below in conjunction with the embodiments shown in the accompanying drawings. It should be noted that these embodiments are not limitations on the present invention, and any equivalent transformation or substitution in terms of function, method, or structure made by those of ordinary skill in the art based on these embodiments shall fall within the protection scope of the present invention.

[0041] Please refer Figures 1 to 4 to a specific embodiment of an auxiliary device for reliable positioning of a drill bit of a hand drill according to the present invention as shown.

[0042] Refer Figure 1-2 As shown, an auxiliary device for reliable positioning of a drill bit a of a hand drill includes: a base plate 1 with a rectangular through hole 10 formed in the center; a fixing mechanism for fixing the base plate 1 on the surface of a workpiece to be processed; a positioning and adjusting mechanism fixedly arranged on the base plate 1, including a support plate 31 and an X-axis sliding component 32 and a Y-axis sliding component 33 arranged on the base plate 1 for adjusting the position of the support plate 31. A circular through hole for the drill bit a to pass through is formed in the support plate 31.

[0043] Combined Figure 1-2 with Figure 3-4 as shown, a clamping mechanism is arranged above the positioning and adjusting mechanism, including: a clamping sleeve 41 having three connected ring sleeves with different diameters along the axis, which are sequentially divided into a smooth section 411, a middle axis section 412, and a threaded section 413 along the axial direction. Three special-shaped holes 410 that are coherent and symmetrically distributed along the central axis of the clamping sleeve 41 are formed on the middle axis section 412 and the threaded section 413, and the special-shaped holes 410 form an opening at the outer end of the threaded section 413; the special-shaped holes 410 include a swallowtail hole on the middle axis section 412 and a rectangular hole on the threaded section 413. Three clamping heads 42 are respectively in radial sliding fit with the special-shaped holes 410. The clamping side of the clamping head 42 is located inside the clamping sleeve 41 and is an arc surface, and the outer side of the clamping head 42 is an inclined table surface, and the outermost end of the inclined table surface is arranged close to the middle axis section 412 of the ring sleeve; a clamping nut 43 is threadedly connected to the clamping sleeve 41. By rotating the clamping nut 43, the clamping head 42 can be pushed to slide in the radial direction to provide a clamping force of the clamping head 42 on the drill bit a; the clamping head 42 includes a swallowtail block that fits with the swallowtail hole and a trapezoidal block that fits with the rectangular hole, and a rectangular groove 420 is formed in the horizontal end surface of the swallowtail block along the radial direction; preferably, a plurality of horizontal grooves 4200 are formed in the inner arc surface of the clamping head 42 at intervals in the vertical direction, so that the inner arc surface of the clamping head 42 forms a toothed structure to increase the clamping force and clamping stability on the drill bit a.

[0044] Refer Figure 4As shown, a reset mechanism 5 is also provided between the clamping head 42 and the clamping sleeve 41. When the clamping nut 43 removes the limit on the clamping head 42, it is used to drive the clamping head 42 to reset. Specifically, the reset mechanism 5 is set in the rectangular groove 420 and includes: a first limiting rod 51, fixed on the clamping sleeve 41; a second limiting rod 52, fixed in the rectangular groove 420; the first limiting rod 51 and the second limiting rod 52 are distributed opposite to each other at both ends of the rectangular groove 420; and a reset spring 53 is arranged in the rectangular groove 420, with its two ends fixed on the first limiting rod 51 and the second limiting rod 52, respectively.

[0045] Specifically, the axial feed mechanism is arranged on the support plate 31 and located outside the clamping mechanism. It is used to drive the clamping mechanism to move the drill bit a axially, providing a feed depth for the drill bit a to drill. A stepped surface 4112 facing upwards is formed between the smooth section 411 and the central shaft section 412. The axial feed mechanism includes: four sets of slide rods 61, which are arranged vertically on the support plate 31 and symmetrically distributed around the central axis of the clamping sleeve 41. The outer wall of the slide rod 61 is threaded near the top; a bearing sleeve 64 is arranged on the stepped surface 4112, and the bearing sleeve 64 is fastened to the smooth section 411 by a first bearing 65. Four fixing blocks 641 are fixed circumferentially on the outer side of the bearing sleeve 64. The fixing blocks 641 are slidably engaged with the slide rod 61 by having sliding holes; a compression spring 62 is sleeved on the slide rod 61 between the fixing block 641 and the support plate 31; and a limiting nut 63 is threadedly connected to the slide rod 61.

[0046] It should be understood that, in this embodiment, a guide mechanism 7 is also included, arranged on the support plate 31, for providing guide and limiting for the stroke of the drill bit a. This mechanism includes: a bearing seat 71, fixedly fitted within a circular through hole, with a limiting ring at the bottom; an angular contact bearing 72, placed within the hole of the bearing seat 71 and axially positioned by the limiting ring, with an interference fit between the angular contact bearing 72 and the bearing seat 71; and a guide block 73, arranged within the angular contact bearing 72, having a tubular structure and extending outwards at its top to form an overlapping portion for contacting the top of the angular contact bearing 72, with a sliding fit between the guide block 73 and the drill bit a. The top opening of the guide block 73 is tapered and chamfered. It should be understood that the guide block 73 can be replaced according to the size of the drill bit a.

[0047] Specifically, the base plate 1 has multiple mounting holes on one side. The fixing mechanism includes: a clamping plate 21, which is arranged parallel to the bottom of the base plate 1 and has multiple assembly holes that align with the mounting holes; and a bolt 22, which coaxially passes through the mounting holes and assembly holes and has tightening nuts 23 at both ends.

[0048] The operating steps for clamping and drilling using this device are as follows: First, place the base plate 1 on the surface of the plate-shaped workpiece to be drilled, and clamp and fix the base plate 1 to the plate-shaped workpiece using the clamping plate 21, bolts 22, and tightening nuts 23. Second, select the corresponding guide block 73 according to the size of the drill bit a, place it in the inner ring of the angular contact bearing 72, place the drill bit a in the clamping mechanism, adjust the clamping length of the drill bit a, rotate the clamping nut 43 on the clamping sleeve 41 to make the clamping nut 43 slide along the thread direction and press the clamping head 42 to achieve the clamping of the drill bit a. Third, position the drill bit a using the positioning adjustment mechanism, install the manual electric drill and the drill bit a, adjust the position of the drill bit a using the axial feed mechanism to insert it into the replaceable guide block 73, start the electric drill, and drive the electric drill to perform deep drilling through the axial feed mechanism.

[0049] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A reliable positioning auxiliary device for a hand drill bit, characterized in that, include: The base plate has a rectangular through hole in the center; A fixing mechanism is used to fix the base plate to the surface of the workpiece to be processed; The positioning and adjustment mechanism is fixed on the base plate and includes a support plate and an X-axis sliding assembly and a Y-axis sliding assembly arranged on the base plate. It is used to adjust the position of the support plate. The support plate has a circular through hole for the drill bit to pass through. A clamping mechanism, arranged above the positioning and adjustment mechanism, includes: A clamping sleeve has three connected annular sections with different shaft diameters. It is divided along the axial direction into a smooth section, a central shaft section, and a threaded section. The central shaft section and the threaded section are provided with at least three irregular holes that are continuous and symmetrically distributed along the central axis of the clamping sleeve. The irregular holes have openings at the outer ends of the threaded sections. Clamping heads are provided in accordance with the number of irregular holes and are respectively radially slidingly engaged with the irregular holes. The clamping side of the clamping head is located inside the clamping sleeve and is an arc surface. The outer side of the clamping head is a ramp surface. The outermost end of the ramp surface is arranged close to the central axis section of the ring sleeve. A clamping nut is threadedly connected to the clamping sleeve. By rotating the clamping nut, the clamping head can be pushed to slide in the radial direction to provide clamping force on the drill bit. A reset mechanism is also provided between the clamping head and the clamping sleeve, which is used to drive the clamping head to reset after the clamping nut removes its limiting effect on the clamping head; An axial feed mechanism is arranged on the support plate and located outside the clamping mechanism. It is used to drive the clamping mechanism to move the drill bit axially and provide a feed depth for the drill bit to drill. The irregular-shaped hole includes a dovetail hole on the central shaft section and a rectangular hole on the threaded section; the clamping head includes a dovetail block that mates with the dovetail hole and a trapezoidal block that mates with the rectangular hole, the horizontal end face of the dovetail block having a rectangular groove radially formed; the reset mechanism includes: The first limiting rod is fixed to the clamping sleeve. The second limiting rod is fixed inside the rectangular groove, and the first limiting rod and the second limiting rod are distributed opposite each other at both ends of the rectangular groove. A reset spring is arranged in the rectangular groove, and its two ends are respectively fixed to the first limiting rod and the second limiting rod; It also includes a guide mechanism disposed on the support plate for providing guide and limit for the stroke of the drill bit tip, comprising: A bearing housing is fixedly fitted inside the circular through hole, and a limiting ring is provided at the bottom of the bearing housing; An angular contact bearing is placed in the bearing housing bore and axially positioned by the limiting ring. The angular contact bearing is interference-fitted with the bearing housing. The guide block, arranged inside the angular contact bearing, has a tubular structure and extends outward at the top to form an overlapping portion for overlapping the top of the angular contact bearing. The guide block slides in conjunction with the drill bit.

2. The reliable positioning auxiliary device for a hand drill bit according to claim 1, characterized in that, An upward-facing stepped surface is formed between the smooth section and the central axis section, and the axial feed mechanism includes: Multiple sets of sliding rods are vertically arranged on the support plate and symmetrically distributed about the central axis of the clamping sleeve. The outer wall of the sliding rod is threaded near the top. A bearing sleeve is arranged on the stepped surface, and the bearing sleeve and the smooth section are fastened together by a first bearing. Several fixing blocks are fixedly provided on the outer side of the bearing sleeve along the circumferential direction. The fixing blocks are slidably engaged with the slide rod by having sliding holes. A compression spring is sleeved on a slide rod between the fixed block and the support plate; A limiting nut is threadedly connected to the slide rod.

3. The reliable positioning auxiliary device for a hand drill bit according to claim 1, characterized in that, The inner arc surface of the clamping head is provided with several horizontal grooves arranged at vertical intervals.

4. The reliable positioning auxiliary device for a hand drill bit according to claim 1, characterized in that, The top opening of the guide block is chamfered.

5. The reliable positioning auxiliary device for a hand drill bit according to claim 1, characterized in that, The base plate has multiple mounting holes on one side, and the fixing mechanism includes: The clamping plate is arranged parallel to the bottom plate and has multiple assembly holes that align with the mounting holes. The bolt is coaxially inserted through the mounting hole and assembly hole, and has a tightening nut at both ends.

Images