Self-cooling drilling tool

Abstract

The invention discloses a self-cooling drilling tool which comprises a drilling rod, a liquid storage drum, a piston, cooling liquid, a clamping handle and a hole gauge. The tail section of the drill rod is inserted from one end of the liquid storage drum to be connected into the liquid storage drum, and an inner cavity of the drill rod is communicated with an inner cavity of the liquid storage drum. The other end of the liquid storage drum is coaxially and fixedly connected with a clamping handle, and the electric drill transmits torsion to the liquid storage drum and the drill rod by clamping the clamping handle. And the hole gauge is adhered to the processing surface. During drilling, an electric drill clamped with the self-cooling drilling tool is held by a hand, and a drill bit is inserted into a guide hole of the hole gauge to drill a machining surface. When the drill bit generates heat due to friction with a hole site, the leaking stoppage wax plug preassembled in the inner cavity of the drill rod is heated, melted and flows away to enable the liquid storage drum to be communicated with the hole site, and cooling liquid in the liquid storage drum flows into the hole site through the inner cavity of the drill rod under the action of inertia, centrifugal force and the piston to cool the drill bit so as to prevent the drill bit from being burnt out due to overheating. The hole gauge normalizes the drilling position and prevents the drill from deviating. The self-cooling drilling tool is durable, efficient and easy to operate.

Description

Technical Field

[0001] This application relates to the technical field of power tools, and more particularly to a self-cooling drill bit. Background Technology

[0002] Since the invention of the electric drill, cooling the drill bit deep inside the hole has been a major challenge. Current solutions only partially address this by spraying coolant from the outside inwards into the hole. However, achieving this cooling method generally requires the following conditions: first, the presence of someone to assist in spraying the coolant; second, the work area being relatively low to the ground or the workpiece requiring minimal hand-holding, allowing the operator to spray coolant with their other hand. A bigger problem, however, is the inherent nature of the hole itself: the deeper the hole, the more easily the drill bit burns out, as external coolant is blocked by accumulated drill cuttings and the temperature and pressure within the hole, preventing it from reaching the deeper drill bit. In the current construction industry, where hard and brittle building materials such as stone panels and slabs are widely used, hollow diamond drills, originally used in glass processing, are commonly used for drilling these materials to avoid the risk of drill bit breakage from impact drills or hammer drills. Typically, on construction sites, installers use an electric drill to hold the hollow diamond drill, initially angled against the surface of the stone or slab material, to perform the drilling operation. Specifically, the existing technology involves the installer holding a hand drill with one hand, holding the switch, and first angled the drill bit against the wall surface covered with building materials such as stone to locate the notch. Then, the drill is held upright and driven deeper. The drill is then swung around to agitate the hole, achieving even grinding and slag removal. The other hand holds a perforated water bottle and sprays water into the hole to cool it and flush away slag. However, as the hole depth increases, the probability of water reaching the drill bit decreases; furthermore, deeper holes make slag removal and heat dissipation more difficult. Then, the high temperature at the bottom of the hole creates high pressure inside, causing water sprayed to the hole to be backflowed out by the depressurized gas. As a result, the high temperature melts the brazing filler metal used to bind the diamond grit to the drill bit, causing the diamond grit to fall off, resulting in a so-called "bare-headed drill." Therefore, often before a hole is even finished, the drill rod is already unusable and needs to be replaced, significantly reducing work efficiency. On the other hand, the wobbling and tailing technique used to balance grinding and slag removal can deform the drilled hole and cause it to become non-perpendicular to the machined surface. This can lead to insufficient holding force after the subsequent insertion of the rubber plug, resulting in an imbalance and a potential safety hazard of the installed part loosening. Furthermore, installers need to simultaneously consider: aiming at the hole position and using a slanted drill for positioning, preventing the drill bit from slipping and correcting its deviation, and using the wobbling and tailing technique to prevent slippage and balance grinding. The heavier the pressure applied to the drill bit at the start, the greater the deviation force, while too little pressure will cause the drill bit to spin freely. Therefore, installers without sufficient experience cannot complete this drilling operation, which limits the applicability of the tools. Summary of the Invention

[0003] To address the aforementioned problems, this application provides a self-cooling drill bit. Internally contained coolant is sprayed from the drill bit into the bottom of the hole through the inner cavity of the drill rod, cooling the drill bit and reducing friction between the hole and the drill rod. This extends the life of the drill rod, increases drilling speed, and reduces the user's workload. The self-cooling drill bit provided in this application can be equipped with a hollow straight-cylinder drill bit brazed with diamond abrasive or a hollow large-head drill bit. It can be used in conjunction with an electric drill on construction sites to drill holes in walls and floors covered with building materials such as slabs or stone slabs; or in drilling operations at processing stations in glass processing factories. It can also be equipped with an internally cooled twist drill for drilling in other industries such as sheet metal, easily drilling into thick steel plates and thick metal parts. It is particularly suitable for deep drilling of aluminum alloy materials. Because the drill slag from aluminum alloys becomes extremely sticky and soft when heated instantly, ordinary drill bits quickly become covered with aluminum drill slag, preventing the drill bit's cutting edge from cutting to the bottom of the hole and thus hindering deep drilling. Thanks to the self-cooling drill bit provided in this application, the piston can press the coolant into the bottom of the drilled hole through the inner cavity of the drill rod, so that the bottom of the hole and the aluminum drill slag that has just been cut off from the bottom of the hole can be cooled down in time by the coolant, thereby hardening the aluminum drill slag and encapsulating the aluminum drill slag; so that the aluminum drill slag loses its adhesiveness and cannot adhere to the drill bit and is washed away by the coolant, thus allowing the drilling to go deeper smoothly.

[0004] This application provides a self-cooling drill bit, comprising a drill rod, a reservoir drum, a piston, a coolant catcher, coolant, a clamping shank, and a hole gauge. The drill rod is a hollow drill rod, and the reservoir drum is a cavity container for containing coolant. The tail section of the drill rod is inserted into the reservoir drum from one end and connected to the reservoir drum, allowing the inner cavity of the drill rod to communicate with the inner cavity of the reservoir drum. The piston is located in the secondary cavity of the reservoir drum. The coolant catcher is located inside the reservoir drum. The clamping shank is fixedly connected to the reservoir drum and coaxial with the drill rod, and the clamping shank is clamped onto the chuck of an electric drill. The hole gauge is a sheet-like body, which is pasted onto the machining surface to be drilled to limit the drill bit's landing point, regulate the drilling position, and prevent the drill bit from deviating.

[0005] When the reservoir drum rotates due to kinetic energy, the coolant inside the reservoir drum also rotates and absorbs kinetic energy. As a result, the coolant generates inertia and centrifugal force, causing it to adhere tightly to the inner wall of the reservoir drum. Since the coolant is not fixedly connected to the reservoir drum, when the rotational speed of the reservoir drum slows down relative to the rotational speed of the coolant, the coolant enters the catcher due to inertia. The catcher guides the coolant to the end of the piston through its own channel. After the piston draws in the coolant through its reciprocating motion, it squeezes the coolant out through the inner cavity of the drill pipe.

[0006] The drill rod head has a leak-stopping wax plug in its inner cavity, a side hole on the periphery of the head, and a meshing groove at the tail.

[0007] The liquid storage drum includes an outer cup and an inner cup; the outer cup encloses the inner cup; a core cylinder is provided at the foot of the outer cup, the core cylinder being a cavity with an elliptical radial cross-section; the clamping handle is coaxially fixed to the bottom of the core cylinder at its outer end face; a core tube is provided at the foot of the inner cup, the core tube being coaxial with the core cylinder; a one-way valve is provided at the inner end of the core tube, the one-way valve including a rubber ball, a rubber ball lug, and a hanging lug fixed to the bottom of the cup; the hole spacing of the rubber ball lug is smaller than the column spacing between the hanging lugs.

[0008] The shaft cylinder contains a spring and a piston; the spring is located between the piston and the bottom of the shaft cylinder; the piston is a cylinder with an elliptical radial section; the outer circumference of the piston has multiple small annular grooves, each groove containing a small sealing ring; the piston has a first through hole coaxially at its central axis, and the first through hole has two levels of open pits at its two end faces; each of the higher open pits has multiple welding pillars at its bottom; each of the two higher open pits is equipped with a central hole cover plate, each central hole cover plate has welding holes corresponding to the welding pillars, and the inward-facing surface of the plate has anti-slip protrusions; the two central hole cover plates A first elastic film and a second elastic film are respectively provided between the piston and the bottom surface of the corresponding high-grade open pit; the first elastic film is located on the side of the pit bottom near the bottom of the shaft cylinder, and a liquid passage slit is provided around the center of the first elastic film; the second elastic film is located on the side of the pit bottom away from the bottom of the shaft cylinder, and a rod passage hole is provided at the center of the second elastic film; the diameter of the rod passage hole is smaller than the diameter of the corresponding middle hole on the middle hole cover plate, and also smaller than the diameter of the drill rod body; the rod passage hole has a first protrusion around the hole facing the low-grade open pit; both the first and second elastic films have clearance holes at the corresponding welding column.

[0009] The piston has a second through hole parallel to one side of the first through hole; a check plug is provided in the second through hole; the length of the check plug is longer than the depth of the second through hole; the bottom surface of the check plug head is larger than the opening of the second through hole, and the plug head is located at the end of the second through hole near the bottom of the shaft cylinder; the check plug head has multiple tapered sections, the tips of which point towards the tail of the check plug; the tail of the plug has an anti-disengagement hook, the total length of which is longer than the width of the opening of the second through hole, the total width of which is narrower than the width of the opening of the second through hole, and the total height of which is less than the thickness of the central hole cover plate.

[0010] The piston body is provided with a pin radially at the midpoint of the central axis of the first through hole. The central axis of the pin is perpendicular to the central axis of the first through hole and coaxial with the minor diameter of the outer ellipse of the piston. The cross-sectional width of the pin is smaller than the width of the engagement groove.

[0011] The core tube has an annular platform on its inner wall near the inner port and a pair of symmetrically arranged snap-fit ​​holes on its middle section wall, thereby forming an open receiving cavity facing the outer port of the core tube and having a snap-fit ​​locking function.

[0012] The receiving cavity is provided with a central hole rubber plug, and a retaining lug is provided on the periphery of the central hole rubber plug corresponding to the retaining hole; the inner section of the central hole rubber plug is provided with an annular groove to correspondingly avoid the annular platform; the retaining lug engages with the retaining hole to lock the central hole rubber plug in the receiving cavity; the central hole rubber plug is coaxial with the drill rod and encases the drill rod through its central hole; the inward end face of the central hole rubber plug is provided with an eccentric socket.

[0013] The inner cup has a liquid-collecting component in its inner cavity and multiple large annular grooves on its outer wall. Each of the large annular grooves contains a large sealing ring. The liquid-collecting component, arranged in the direction extending from the main cavity of the liquid storage drum towards the axial cylinder, comprises four parts: multiple funnels, a closing plate, a central hole rubber plate, and a central hole buckle plate. The funnels have rectangular openings. The closing plate is a circular plate with a central hole. A buckle array is provided on the front of the closing plate. The central hole rubber plate has the same diameter as the closing plate and has a perforation array on its body corresponding to the buckle array. The central hole rubber plate also has a through-hole. The central hole buckle plate has a corresponding buckle array on its body. The device has an array of snap-fit ​​holes, and the central hole snap plate also has a through hole. The snaps of the snap-fit ​​array pass through the through hole and the snap-fit ​​hole in sequence and then release their elasticity to snap onto the central hole snap plate, thereby causing the closing plate and the central hole snap plate to clamp the central hole rubber plate in the middle. The diameter of the central hole on the central hole rubber plate is smaller than the diameter of the central hole of the closing plate and the central hole snap plate, and the three holes are coaxial. The diameter of the central hole on the central hole rubber plate is also smaller than the diameter of the drill rod body. The central hole of the central hole rubber plate has a second protrusion around the hole on the surface facing the central hole snap plate. The central hole snap plate is smaller than the central hole rubber plate, thus exposing the edge of the central hole rubber plate.

[0014] The funnel comprises three parts: a funnel body, a funnel tube, and a neck tube. The outer surface of the funnel body and the funnel tube are arc-shaped. The funnel is arranged radially along the inner cup wall with the inner cup axis as the origin, and the arc-shaped outer surface of the funnel body is fixedly attached to the inner cup wall. The outer periphery of the tail section of the neck tube is fixedly attached to the closing plate, and the tube opening extends out of the closing plate and then passes through the through holes of the central hole rubber plate and the central hole buckle plate in sequence, protruding out of the central hole buckle plate. The neck tube carries the closing plate and extends to the end towards the shaft cylinder, causing the edge of the central hole rubber plate to abut against the outer periphery of the shaft cylinder opening, thereby isolating the inner cavity of the shaft cylinder from the middle cavity of the liquid storage drum, while facilitating the connection between the funnel and the shaft cylinder.

[0015] The inner cup has a convex handle on the bottom of its outer wall in an axially symmetrical manner; the outer cup has a locking interface on the convex handle near the rim in an axially symmetrical manner, which can lock and engage the convex handle.

[0016] The inner cup cavity has a balance valve at its bottom that connects the inside and outside of the liquid storage drum. The balance valve consists of a through hole on the bottom of the cup, a hanging post, and a film cover installed on the hanging post. There are two hanging posts, symmetrically arranged on both sides of the through hole opening. The film cover has a core post at its center on the side facing the bottom of the cup, a core post head at its base, and hanging holes at both ends. The film cover is hung on the hanging post through the hanging holes to cover the through hole, and the core post is inserted into the through hole and protrudes from the opening outside the cup. The distance between the hanging holes is smaller than the distance between the hanging posts.

[0017] The aperture gauge includes a target body, a guide hole, a star-shaped sighting slit, and an adhesive backing; the guide hole is located at the center of the target body; the star-shaped sighting slit communicates with the guide hole and is arranged radially with the guide hole as the center; the adhesive backing is pasted on the back of the target body.

[0018] The beneficial effects of this invention are as follows:

[0019] The self-cooling drill bit provided in this application connects the drill rod's inner cavity with a reservoir drum. Utilizing the hollow structure of the drill rod, coolant from the reservoir drum flows from the drill rod to the drill bit, then out through the drill bit's side or end holes. It then travels from the bottom of the drilled hole, wrapping around the drill bit—the main source of frictional heat—from the inside out. This achieves the goal of removing as much heat as possible with a small amount of coolant, solving the drill bit cooling problem, preventing the drill bit from burning out due to overheating, extending the drill bit's service life, and saving time. Simultaneously, the coolant, after absorbing heat, is reused to flush away drill cuttings in the hole, eliminating the increased resistance on the drill rod caused by the cuttings and solving the problem of harmful friction on the hole wall, making the entire drilling process efficient and fast. The mechanism of the pre-installed sealing wax plug in the drill rod's inner cavity melting upon heating to clear the coolant flow is equivalent to installing an automatic valve in the coolant flow channel of the self-cooling drill bit. This valve automatically opens under certain temperature conditions, accurately determining the timing of coolant supply and achieving the goal of saving coolant consumption. Furthermore, the hole gauge design allows the drill bit to be positioned and guided at the start of drilling, solving the problem of drill bit deviation during initial drilling operations. Additionally, it frees up one hand for anchoring the body during operation, which is a crucial safety feature for construction work, especially high-altitude drilling, where mobile work is common. In particular, construction noise that can travel many floors is primarily from electric hammers and impact drills. This application, with its high efficiency and speed, combined with a regular electric drill, can replace some of the work done by impact drills and electric hammers. Since the drilling method of this application only uses rotary grinding or cutting to excavate without the hammering and breaking methods of electric hammers, the operating noise is low, making it an effective tool for reducing construction noise. Attached Figure Description

[0020] To more clearly illustrate the technical solution of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the overall structure of the self-cooling drill bit provided in this application, configured with three types of drill pipes.

[0022] Figure 2 This is a disassembly diagram and a partial enlarged view of the self-cooling drill bit provided in this application;

[0023] Figure 3 This is a schematic cross-sectional view along the AA direction of the self-cooling drill bit provided in this application in the state of injecting coolant (front).

[0024] Figure 4 This is a schematic cross-sectional view along the AA direction of the self-cooling drill bit provided in this application in the state of injecting coolant (after).

[0025] Figure 5 This is a comparative schematic diagram of the disassembly and assembly of a partial structure of the self-cooling drill bit provided in this application;

[0026] Figure 6 This is a cross-sectional view of the piston of the self-cooling drill bit provided in this application along the BB and CC directions;

[0027] Figure 7 This is a schematic diagram of the piston and connected internally cooled twist drill of the self-cooling drill bit provided in this application, showing a top-to-bottom view comparison.

[0028] Figure 8 This application provides a schematic diagram of the inner cup bottom structure and connecting funnel of the self-cooling drill bit, as well as three types of drill rods.

[0029] Figure 9 This is a schematic diagram of the structure of the inner cup, the central hole rubber plug, and the one-way valve of the self-cooling drill bit provided in this application;

[0030] Figure 10 This is a schematic diagram of the self-cooling drill bit and its matching bore gauge provided in this application;

[0031] Figure 11 This is a schematic diagram of the application of the hole gauge provided in this application.

[0032] Figure label:

[0033] Drill rod 1; internal cooling twist drill 1a; end hole 1a1; hollow straight drill 1b; hollow big-head drill 1c; diamond abrasive 1b1; side hole 1b2; internal cooling passage 10; meshing groove 11; plugging wax plug 101;

[0034] 2. Liquid reservoir drum; 20. Inner cup; 200. Inner cup body; 210. Large annular groove; 211. Large sealing ring; 201. Shaft tube; 2010. Snap-fit ​​square hole; 2011. Annular platform; 2012. Receiving cavity; 203. Protruding handle; 22. Central hole rubber plug; 220. Annular groove; 221. Eccentric socket; 225. One-way valve; 230. Rubber ball; 231. Rubber ball ear; 232. Hanging ear post; 24. Balance valve; 240. Film cover; 241. Core post; 2411. Core post head; 242. Hanging hole; 245. Hanging hole post; 246. Through hole; 28. Screw; 2c. Coolant;

[0035] Outer cup 2d; Outer cup body 2d0; Card interface 2d00; Shaft cylinder 2d1;

[0036] Clamping handle 3e;

[0037] Piston 40; First through hole 401; Low-grade open pit 4010; High-grade open pit 4011; Welded column 4012; Second through hole 402; Small annular groove 410; Small sealing ring 411; Pin hole 42; Pin 421; Anti-reverse rubber nail 43; Rubber nail head 431; Anti-disengagement hook 432; Conical joint 433; First elastic rubber sheet 44; Liquid passage gap 441; Second elastic rubber sheet 45; Rod hole 450; First protrusion 451; Clearance hole 445; Central hole cover plate 46; Welded hole 461; Anti-slip protrusion 463;

[0038] Spring 48;

[0039] Liquid scoop 50; funnel 51; funnel body 510; funnel tube 512; neck tube 513; closing plate 52; snap-fit ​​array 521; central hole snap plate 53; snap-fit ​​hole array 530; central hole rubber plate 54; through hole array 540; second protruding nozzle 551; through pipe hole 555;

[0040] Hole gauge 80; guide hole 81; star-shaped sighting slot 82; adhesive backing 83;

[0041] Wall 900. Detailed Implementation

[0042] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0043] Please see Figures 1 to 11 The self-cooling drill bit described in this application embodiment includes:

[0044] Drill pipe 1, made of Figure 1 , Figure 2 and Figure 4As shown in the figure, drill rod 1 includes a hollow straight-tube drill 1b and a hollow large-head drill 1c with the drill bit brazed or sintered with diamond particles 1b1, as well as an internally cooled twist drill 1a. The hollow straight-tube drill 1b has a side hole 1b2 on its circumference at the head. All the aforementioned drill rods 1 have a sealing wax plug 101 in their inner cavity at the head, and a meshing groove 11 at the tail. Another common feature of the aforementioned drill rods is that they all have an inner cavity within the rod body that leads directly to the tail end for supplying coolant 2c. The use of a side hole 1b2 in the hollow straight-tube drill 1b to replace the end hole 1a1 directly opened from the inner cavity overcomes the disadvantage that the end hole 1a1, facing the bottom of the drilled hole, is easily blocked by drill cuttings, making it suitable for grinding drilling of hard and brittle materials where drill cuttings easily turn into powder. The slag produced by the internal cooling twist drill 1a used for drilling metal is mostly in the form of strips and blocks, and there is rarely any slag clogging the end hole 1a1. Therefore, the end hole 1a1, which has a relatively simple machining process, is used.

[0045] Please see Figure 4 The groove of the meshing groove 11 changes the situation where the smooth body of the drill rod 1 cannot be gripped strongly, and helps to anchor the drill rod 1 in the whole drill tool, so that the drill rod 1 is synchronized with the whole drill tool during operation without rotating relative to it.

[0046] For reservoir drum 2, please refer to [link / reference]. Figure 2 , Figure 3 , Figure 4 The reservoir drum 2, used to store coolant 2c, consists of an inner cup 20 and an outer cup 2d that encloses the inner cup 20. The inner cup 20 has a large annular groove 210 around its periphery, into which a large sealing ring 211 is embedded, protruding beyond the periphery of the inner cup 20. This arrangement allows the outer wall of the inner cup 20 and the inner wall of the outer cup 2d to make contact through the large sealing ring 211, achieving a sealed fit and ensuring the coolant 2c stored in the drum is leak-proof. Furthermore, the inner cup 20 has a symmetrically arranged protruding handle 203 on its outer wall near the bottom, and the outer cup 2d has a symmetrically arranged snap-fit ​​interface 2d00 near the opening, corresponding to the protruding handle 203. These two features form a hinged assembly, enabling quick and easy disassembly and assembly of the inner cup 20 and the outer cup 2d.

[0047] Outer cup 2d, made of Figure 1 Combination Figure 3 As seen in the top view on the left, the outer cup 2d is divided into two main parts: the outer cup body 2d0 and the spindle cylinder 2d1 at the cup foot. The outer cup body 2d0 is a perfectly circular open rotating cavity. As the structural support of the self-cooling drill bit, the outer cup body 2d0 plays a crucial role in bearing the rotational torque. The spindle cylinder 2d1 is an elliptical open cavity, an extension of the outer cup body 2d0 cavity, and is the main functional area of ​​the self-cooling drill bit. The spindle cylinder 2d1 is coaxial with the outer cup body 2d0. Please refer to [link / reference]. Figure 5The bottom of the cup, which serves as the transition from the outer cup body 2d0 to the central cylinder 2d1, is a hollow, round tower-shaped structure that gradually tapers upwards.

[0048] Clamping handle 3e, please refer to Figure 1 The clamping handle 3e is fixed to the bottom of the shaft cylinder 2d1, and the clamping handle 3e is coaxial with the liquid storage drum 2; the main function of the clamping handle 3e is to receive the rotary power input.

[0049] Piston 40, please refer to Figure 4 , Figure 5 , Figure 6 The piston 40 is mounted on the shaft cylinder 2d1. The piston 40 has a cylindrical structure, and its radial cross-section is an ellipse that mates with the inner cavity of the shaft cylinder 2d1. The piston 40 includes a first through hole 401, a welded post 4012, a second through hole 402, a small annular groove 410, a small sealing ring 411, a pin hole 42, a pin 421, a check pin 43, a first elastic sheet 44, a second elastic sheet 45, and two central hole cover plates 46. The main function of the piston 40 is to compress the coolant 2c, causing it to spray out and cool the drill bit.

[0050] Inner cup 20, please refer to Figure 2 , Figure 3 , Figure 4 The inner cup 20 is a hollow, circular, open rotating cavity, divided into two main parts: the inner cup body 200 and the axial tube 201 at the cup foot. The inner cup body 200 mainly serves as a storage chamber for the coolant 2c. The axial tube 201 is located in the center of the inner cup body 200 and communicates with it. An annular platform 2011 is provided within the inner cavity of the axial tube 201 near the bottom of the inner cup 20. A snap-fit ​​square hole 2010 penetrating the tube wall is provided in the middle section of the axial tube 201, thereby forming a lockable and open receiving cavity 2012 within the axial tube 201.

[0051] Please refer to the following: Figure 2 , Figure 3 , Figure 4A central hole rubber plug 22 is provided within the aforementioned receiving cavity 2012. The central hole rubber plug 22 has an annular groove 220 at its head facing the bottom of the inner cup 20. During assembly, when the central hole rubber plug 22 is inserted into the shaft tube 201, the concave shape of the annular groove 220 avoids the convex shape of the annular platform 2011, allowing the plug section surrounded by the annular groove 220 to be inserted into the hole section within the annular platform 2011. However, the central hole rubber plug 22 behind the annular groove 220 becomes larger and cannot be inserted into the hole section, thus serving as a limiting element. Simultaneously, a retaining lug 221 is provided on the periphery of the central hole rubber plug 22 at its middle section. Under the thrust of insertion during assembly and the constraint of the cavity opening of the receiving cavity 2012, the central hole rubber plug 22 deforms by being squeezed into the central hole, causing the inclined surface at the front end of the latch 221 to be squeezed into the snap-fit ​​square hole 2010 first, and then the entire latch 221 is completely snapped into the snap-fit ​​square hole 2010. Then the latch 221 returns to its original shape, so that the central hole rubber plug 22 is self-locked in the receiving cavity 2012 by the latch 221.

[0052] Please see Figure 3 and Figure 8 The bottom of the inner cup 20 is set as a flat plate for easy arrangement of components. The components set on the flat plate are: one-way valve 23 and balance valve 24.

[0053] Check valve 23, please refer to Figure 2 , Figure 3 and Figure 8 The one-way valve 23 is located at the center of the bottom plate of the cup, consisting of a rubber ball 230 and rubber ball lugs 231 extending from both sides (see below). Figure 8 The right figure shows the drill pipe 1 not inserted; the two hanging lugs 232 (see...) Figure 8 (See left 2 image) and the post screw 28 constitute the structure. Two hanging posts 232 are respectively aligned and set on both sides of the center of the bottom plate of the inner cup 20, that is, on both sides of the port of the shaft tube 201; the two hanging posts 232 are not coplanar with the central axis of the shaft tube 201; two rubber ball ears 231 are respectively sleeved on the two hanging posts 232, and then screws 28 are screwed into the top of the hanging posts 232 to fix and lock the rubber ball ears 231, thereby locking the rubber ball 230, thus realizing the assembly of the one-way valve 23. Since the distance between the ear holes of the rubber ball ears 231 is smaller than the column spacing between the hanging posts 232, the two rubber ball ears 231 undergo elastic deformation, generating two traction forces that are parallel to the length direction of the rubber ball ears 231 and have the same magnitude but opposite direction with the rubber ball 230 as the equilibrium point.

[0054] Please see Figure 8 , Figure 9 Since the diameter of the rubber ball 230 is larger than the thickness of the rubber ball lug 231, the two traction forces mentioned above will bring the one-way valve 23 and the eccentric socket 225 closer together, thereby generating a force that pushes the rubber ball 230 against the eccentric socket 225, which is the power that restores the one-way valve 23 to the closed state.

[0055] It should be noted that the axis of the inner cup 20 does not coincide with the coplanarity of the two lug posts 232 and are separated by a certain distance (see...). Figure 8 (Right image).

[0056] Please combine Figure 2 , Figure 8 , Figure 9 The purpose of setting the eccentric socket 225 at the central hole port of the central hole plug 22 is to accommodate the distance between the axis of the inner cup 20 and the coplanarity of the two hanging lugs 232, i.e., the offset. The offset is to misalign the center of the rubber ball 230 of the one-way valve 23 with the axis of the central hole plug 22, so that when the drill rod 1 is inserted into the inner cup 20 through the central hole of the central hole plug 22, the end face of the drill rod 1 does not support the midpoint of the spherical surface of the rubber ball 230, but rather a point offset from the midpoint of the spherical surface towards the outer edge of the spherical surface. This causes the axis of the supporting force of the drill rod 1 on the rubber ball 230 to be misaligned with the coplanarity of the two hanging lugs 232, preventing the rubber ball 230 from being pushed away from the bottom of the inner cup 20 by the drill rod 1 and pressed against the end face of the drill rod 1, thus obstructing the installation path of the drill rod 1. The aforementioned misalignment causes the rubber ball 230 to become unbalanced under the support of the drill rod 1, and it rolls to one side under the elastic action of the rubber ball lug 231. This frees up axial space for the inner cup 20 to ensure that the drill rod 1 can be smoothly inserted into the deepest part (see...). Figure 8 (Left image).

[0057] Balance valve 24, please refer to Figure 2 , Figure 3 and Figure 8 The balance valve 24 is located on the edge of the cup bottom plate and consists of a film cover 240, a through hole 246, two hanging posts 245, and screws 28 on the posts. The film cover 240 has a core post 241 at its center and a hanging hole 242 at each end. The through hole 246 is a through hole located on the bottom plate of the inner cup 20; the two hanging posts 245 are symmetrically arranged on the bottom plate of the inner cup 20 on both sides of the through hole 246, and the two hanging posts 245 are coplanar with the central axis of the through hole 246. During assembly, the core post 241 in the middle of the film cover 240 is inserted into the through hole 246, the hanging holes 242 on both sides are fitted onto the corresponding hanging posts 245, and then the screws 28 are screwed into the top of the hanging posts 245 to fix and lock the film cover 240, thus achieving the assembly of the balance valve 24 by locking the film cover 240 with the hanging posts 245 and the screws 28.

[0058] Please combine Figure 2 , Figure 3 , Figure 8The right figure shows the film cover 240. Because the distance between the two mounting holes 242 of the film cover 240 is less than the distance between the two mounting posts 245, the film cover 240 undergoes elastic deformation, generating two traction forces of equal magnitude and opposite direction to the length of the film cover 240, with the core head 2411 as the equilibrium point. Since the volume of the core head 2411 is larger than that of the core post 241, it increases the distance between the end of the through hole 246 and the film body. The two traction forces mentioned above will bring the end of the through hole 246 closer to the film body, thus generating a force that pushes the core head 2411 against the through hole 246. This is the driving force that causes the balance valve 24 to return to the closed state. When an external force acts perpendicularly on the core column 241 from outside the bottom plate of the inner cup 20, the core column head 2411 will retract and not abut against the port of the through hole 246, causing the balance valve 24 to open. The balance valve 24 can then release the intracavity pressure generated when the reservoir drum 2 is inserted into the drill rod 1 or when the inner cup 20 is fitted into the outer cup 2d through the open through hole 246. Conversely, when coolant 2c flows from the reservoir drum 2 into the opening of the shaft cylinder 2d1, causing a negative pressure inside the reservoir drum 2, the balance valve 24 can draw in air through the through hole 246 to compensate and maintain the pressure balance inside the reservoir drum 2.

[0059] Liquid container 50, please combine Figure 3 , Figure 5 , Figure 8 The liquid-collecting component 50 is located inside the liquid storage drum 2, specifically inside the inner cup 20 cavity. It includes two funnels 51 and three plates: a closing plate 52, a central hole adhesive plate 54, and a central hole retaining plate 53, each with a central hole and ultimately fitted together. In this embodiment, there are two funnels 51; in other embodiments, there may be more than two. Each funnel 51 includes a funnel body 510, a funnel tube 512, and a neck tube 513. The funnel body 510 has a rectangular opening, and its outer surface is curved to fit snugly against the inner cup 20 wall and is fixedly attached to it. The funnel tube 512 is bent into an arc shape following the inner cup 20 wall; one end of the funnel tube 512 is fixedly connected to the funnel body 510, and the other end is fixedly connected to the neck tube 513. After the neck tube 513 is connected to the bucket tube 512, it bends and turns to be axially arranged in the inner cup 20, and then extends out to the mouth of the inner cup 20.

[0060] Closed plate 52 is a circular plate. Please refer to... Figure 4 , Figure 5The closing plate 52 has a central hole through which the drill rod 1 passes and is fixedly connected to the neck tube 513 that passes through the plate. Its surface facing away from the funnel 51 has a snap-fit ​​array 521. The diameter of the central hole rubber plate 54 is equal to that of the closing plate 52, and it has a perforation array 540 at the position corresponding to the snap-fit ​​array 521 on its body. It also has a through-hole 555 for the neck tube 513 to pass through. The central hole buckle plate 53 has a snap-fit ​​array 530 at the position corresponding to the snap-fit ​​array 521 on its body, and like the central hole rubber plate 54, it also has a through-hole 555 for the neck tube 513 to pass through. After the snaps of the snap-fit ​​array 521 pass sequentially through the holes of the perforation array 540 of the central hole rubber plate 54 and the snap-fit ​​array 530 of the central hole buckle plate 53, the snaps release their elasticity and snap the central hole buckle plate 53, thereby clamping the central hole rubber plate 54 between the closing plate 52 and the central hole buckle plate 53. The diameter of the central hole on the central hole plate 54 is smaller than the diameter of the central hole in the closed plate 52 and the central hole in the central hole buckle plate 53, and the three holes are coaxial. The diameter of the central hole in the central hole plate 54 is also smaller than the diameter of the drill rod 1. A second protrusion 551 is provided around the central hole of the central hole plate 54 facing the central hole buckle plate 53. The central hole buckle plate 53 is smaller than the central hole plate 54, thus exposing the edge of the central hole plate 54.

[0061] Funnel 51, please see details. Figure 2 , Figure 4 , Figure 5 The funnel 51 is arranged radially along the wall of the inner cup 20 with the axis of the inner cup 20 as the origin to achieve the dynamic balance of the inner cup 20. The outer periphery of the neck tube 513 of the funnel 51 is fixed to the closing plate 52, and the tube opening extends out of the closing plate 52 and then passes through the corresponding through holes 555 of the central hole rubber plate 54 and the central hole buckle plate 53 in sequence, and then protrudes out of the central hole buckle plate 53. The closing plate 52 extends to the end of the axial cylinder 2d1 along the neck tube 513 of the funnel 51, so that the edge of the central hole rubber plate 54 abuts against the outer periphery of the cylinder opening of the axial cylinder 2d1, thereby isolating the inner cavity of the axial cylinder 2d1 from the main cavity of the liquid storage drum 2, while facilitating the connection between the funnel 51 and the axial cylinder 2d1.

[0062] Hole gauge 80; please refer to Figure 10 , Figure 11 The guide hole 81 is located in the middle of the hole gauge 80; the guide hole 81 is connected to the star-shaped sighting slit 82; the adhesive backing 83 is attached to the back of the target body of the hole gauge 80 and is covered with wax paper. The wax paper can be removed before use to attach the adhesive.

[0063] Wall thickness 900mm, please note. Figure 11 The image shown is of a wall covered with tiles. This is just for illustrative purposes. Naturally, self-cooling drills have many applications, including being mounted on electric drills for drilling walls and floors, and on bench drills for drilling workpieces in jigs, etc. These will not be listed here.

[0064] The above is an overview of the self-cooling drill bit assembly. The following section provides a detailed analysis of the key components of the self-cooling drill bit in terms of structure and assembly.

[0065] First, the piston 40.

[0066] Please see Figure 3 , Figure 5 , Figure 6 The piston 40 has a first through hole 401 located at the central axis. The first through hole 401 has two levels of open pits, one high and one low, on both end faces. The bottom of each of the two higher open pits 4011 has multiple welded pillars 4012 with a height equal to the pit opening. In this embodiment, there are four welded pillars 4012; in other embodiments, there may be more or fewer than four. Each of the two higher open pits 4011 is equipped with a central hole cover plate 46, with welding holes 461 corresponding to the welded pillars 4012 for fitting. A first elastic sheet 44 and a second elastic sheet 45 are respectively provided between the two central hole cover plates 46 and the bottom surface of their respective higher open pits 4011. The first elastic sheet 44 is located at the bottom of the higher open pit 4011 at the end of the piston 40 where the central hole cover plate 46 abuts against the spring 48, and a liquid-passing slit 441 is provided around the center of the first elastic sheet 44. The second elastic film 45 is located at the bottom of the high-grade open pit 4011 on the other end face of the piston 40. The second elastic film 45 has a rod-passing hole 450 at its center. The diameter of the rod-passing hole 450 is smaller than the diameter of the corresponding central hole on the central hole cover plate 46, and the two holes are coaxial. The diameter of the rod-passing hole 450 is also smaller than the diameter of the drill rod 1. Furthermore, the rod-passing hole 450 has a first protrusion 451 around its periphery facing the low-grade open pit 4010. Also, both the first and second elastic films have clearance holes 445 at their corresponding welding posts 4012. When assembling the piston 40 body, firstly, insert the clearance holes 445 of the first elastic film 44 and the second elastic film 45 into the corresponding welding posts 4012 and continue pushing them forward until the films are close to the bottom of the high-grade open pit 4011. Then, fit the welding holes 461 of the middle hole cover plate 46 into the corresponding welding posts 4012, push the middle hole cover plate 46 to the bottom of the high-grade open pit 4011 to press the first and second elastic films together, so that the end of the welding post 4012 is flush with the outer surface of the middle hole cover plate 46. Then, use a welding machine to weld the welding post 4012 and the welding hole 461 together by heat, thus completing the assembly of the piston 40 body.

[0067] Please combine Figure 5 , Figure 6 , Figure 7A pin 421 is pressed into the pin hole 42 in the piston 40 using a tight fit until the pin 421 is completely submerged in the piston 40. Next, a check pin 43 is inserted into the second through hole 402 of the piston 40, through the opening at the end where the first elastic sheet 44 is installed. The anti-disengagement hook 43 of the check pin 43 protrudes through the second through hole 402 and then unfolds. It should be noted that the material of the check pin 43 can be an elastomer such as rubber or silicone, which is easy to manufacture and assemble. Furthermore, the arrangement that the bottom diameter of the pin head 431 is larger than the opening of the second through hole 402 ensures that the second through hole 402 can be completely sealed by the pin head 431. These structural features, combined with the feature that the anti-disengagement hook 432 unfolds after exiting the hole, ensure that the check pin 43 is installed inside the piston 40 and does not fall out.

[0068] Additionally, please see Figure 3 , Figure 5 Combination Figure 7 As shown in the left figure, an anti-disengagement hook 432 is provided at the tail of the anti-reverse rubber nail 43, and the anti-disengagement hook 432 is set as an arrow. This setting makes it convenient for the nail tail to pass smoothly through the second through hole 402 during assembly. In addition, the total length of the anti-disengagement hook 432 is longer than the width of the opening of the second through hole 402, so that the arrow of the elastomeric material can be stably hooked at the opening of the second through hole 402 by the back of the anti-disengagement hook 432 after it unfolds, and can better resist the impact of the rapid flow of coolant 2c through the second through hole 402. Furthermore, due to the setting of the tapered section 433 on the anti-reverse rubber nail 43, and the fact that the tip of the tapered section 433 points to the tail of the anti-reverse rubber nail 43, the bottom area behind the tip is increased and faces the bottom of the shaft cylinder 2d1. The coolant 2c flowing out of the shaft cylinder 2d1 through the second through hole 402 can easily effectively trap the tapered section 433. Only a small flow rate of coolant 2c is needed to push the anti-reverse rubber nail 43, so that the rubber nail head 431 can instantly block the second through hole 402, thereby ensuring that as much coolant 2c as possible can be intercepted in the shaft cylinder 2d1.

[0069] Please see Figure 3 , Figure 7 In contrast to the aforementioned flow interception, the tapered section 433 of the anti-reverse rubber nail 43 conforms to the flow direction of the coolant 2c flowing from the opening of the shaft cylinder 2d1 through the second through hole 402 into the shaft cylinder 2d1. Combined with the small frontal angle of the arrow shape of the anti-disengagement hook 432, the anti-reverse rubber nail 43 allows more cross-sectional area of ​​the second through hole 402 to be allowed for the coolant 2c to flow through. Furthermore, since the length of the anti-reverse rubber nail 43 is longer than the depth of the second through hole 402, the nail body can move freely back and forth within the second through hole 402. The rubber nail head 431 can move away from the opening of the second through hole 402 to expand the flow channel of the coolant 2c, resulting in a higher coolant 2c throughput in the second through hole 402.

[0070] In summary, setting the check valve pin 43 is equivalent to installing a responsive one-way valve between the two end faces of the piston 40.

[0071] Please see Figure 3 , Figure 4 , Figure 5 The piston 40, as a key component propelling the flow of coolant 2c, has its reciprocating motion within the spindle cylinder 2d1. The spring 48, located between the bottom of the spindle cylinder 2d1 and the piston 40, serves as an energy storage mechanism and acts as the piston 40's reset actuator. The kinetic energy for the piston 40's reciprocating motion is transmitted from the electric drill through the clamping handle 3e to the force applied by the operator's hand to the hole. Because the drill rod 1 is engaged with the pin 421 within the piston 40 via the engagement groove 11, a relative tightness between the drill rod 1 and the piston 40 is ensured. During the drilling process, when coolant 2c is sprayed, the force applied by the operator to the reservoir drum 2 encounters the axial static force transmitted from the drill rod 1 to the piston 40 from the hole. This resistance between the two forces translates into the movement of the piston 40 relative to the spindle cylinder 2d1, i.e., the movement of the piston 40 pressing against the coolant 2c within the spindle cylinder 2d1 and the spring 48. The piston 40 is in sealed contact with the inner wall of the shaft cylinder 2d1 through the small sealing ring 411 embedded in the small annular groove 410 on its periphery, which enables the coolant 2c to withstand the pressure applied by the piston 40 without leakage, so that the coolant 2c has enough high pressure to pass smoothly through the narrow internal cooling channel 10 and the gap between the drill rod 1 and the hole wall.

[0072] It should be noted that the torque generated by the rotation of the clamping shank 3e and the spindle cylinder 2d1 driven by the electric drill, along with the frictional force of the drilled hole, is transmitted to the piston 40 through the drill rod 1 and the pin 421, creating resistance. These two forces easily antagonize each other at the contact surface between the non-rigidly connected spindle cylinder 2d1 and piston 40. If a circular spindle cylinder and a circular piston were used, it would be equivalent to having all the elements constituting a bearing, i.e., the piston as the inner ring and the spindle cylinder as the outer ring, and rotational torque could not be transmitted between the inner and outer rings. In this case, the transmission chain of the self-cooling drill bit of this application would break at the small seal ring 411, and the electric drill would be unable to rotate the drill rod 1. Therefore, the self-cooling drill bit of this application adopts an elliptical spindle cylinder 2d1 and an elliptical piston 40. By utilizing the characteristic that the elliptical piston 40 cannot rotate within the elliptical spindle cylinder 2d1, the rotational torque of the electric drill can be smoothly transmitted to the piston 40 and the drill rod 1 through the spindle cylinder 2d1.

[0073] The working principle of the self-cooling drill bit in this application is as follows:

[0074] Please see below. Figure 2 , Figure 4The arc arrow below the figure indicates the rotation direction of the self-cooled drill bit. In this embodiment, the rotation direction of the drill bit is clockwise. In other embodiments, the rotation direction of the drill bit can be counterclockwise, depending on the arrangement of the relevant components. Figure 4 The reservoir 2 shown contains coolant 2c. When the reservoir 2 rotates with the electric drill, the coolant 2c quickly rotates with the reservoir 2. At this time, the laws of physics determine that the coolant 2c will generate two forces: inertia and centrifugal force.

[0075] Please combine Figure 2 , Figure 3 , Figure 4 , Figure 5 As can be seen from the arrangement of the funnel 51, the opening of the funnel body 510 faces the clockwise direction of rotation. During the operation of the self-cooling drill bit, the position of the coolant 2c and the reservoir drum 2 are relatively stationary for most of the time. During the period of relative stationary operation, if the operator suddenly decelerates the self-cooling drill bit, that is, the reservoir drum 2 suddenly decelerates, because there is no rigid connection between the reservoir drum 2 and the coolant 2c, the inertia and centrifugal force will break the relatively stationary state between the reservoir drum 2 and the coolant 2c. The coolant 2c will continue to flow into the funnel body 510 of the funnel 51 in a clockwise direction at a speed close to that before the self-cooling drill bit decelerated, and then flow through the neck tube 513 to the opening of the shaft cylinder 2d1 by inertia. At this point, the operator only needs to ease off the forward push, allowing most of the drill and self-cooling drill bit, except for the drill rod 1 and piston 40, to retract with the help of the spring 48 (spring 48 pushes against the bottom of the spindle cylinder 2d1). Then, the operator can push the drill forward forcefully to complete one spray of coolant 2c. The above action combination is equivalent to first allowing the spring 48 to push the piston 40 back to its natural state before drilling, thereby allowing the piston 40 to move within the spindle cylinder 2d1 cavity to create a vacuum inside the cylinder. Then, using the pressure difference, coolant 2c is drawn from the opening of the spindle cylinder 2d1 through the second through hole 402 into the bottom cavity of the spindle cylinder 2d1; then, the piston 40 is indirectly pushed forward ("pushing the drill forward forcefully") towards the bottom of the spindle cylinder 2d1, so as to squeeze the coolant 2c through the first through hole 401 into the internal cooling channel 10 of the drill rod 1 and then spray out from the end hole 1a1 or the side hole 1b2; incidentally, the spring 48 is compressed.

[0076] Please see Figure 3 , Figure 4 The coolant 2c flowing from the bottom cavity of the shaft cylinder 2d1 through the central hole of the central hole cover plate 46 and through the liquid gap 441 can deform part of the colloid in the first elastic film 44 to expand the cross-section. Please note Figure 4 In the middle, the liquid-passing seam 441 of the first elastic film 44 is impacted, causing the film body at the seam edge to bend into a butterfly shape. Additionally, please see... Figure 3As shown in the right figure, the first elastic film 44 will stick to the central hole cover plate 46 in its natural state to seal the central hole tightly. When encountering a pressure difference, it will stick even tighter to ensure that the negative pressure formed in the shaft cylinder 2d1 does not leak, which is conducive to the intake of coolant 2c.

[0077] Please see Figure 1 , Figure 3 , Figure 1 This is a schematic diagram of the overall structure of the self-cooling drill bit provided in this application, which is equipped with three types of drill rods: internally cooled twist drill 10 (left), hollow straight drill 11, and hollow big-head drill 1c (right).

[0078] The self-cooling drill bit provided in this application is mounted on an electric drill for drilling. Different types of drill rods 1 can be configured as needed. For example, it can be paired with an internally cooled twist drill 1a for drilling tough materials such as stainless steel; or paired with a hollow straight drill 1b for drilling brittle and hard materials such as rock slabs; or mounted with a hollow big-head drill 1c for drilling large-diameter holes. Before mounting the self-cooling drill bit, check the coolant 2c level in the reservoir 2 and the filling status of the sealing wax plugs 101 in the drill rod 1. Ensure that the coolant 2c in the reservoir 2 is sufficient before drilling, and that the sealing wax plugs 101 are used to seal the drill rod 1. This ensures that the flow of coolant 2c can be controlled and opened in a timely manner during drill bit use, and also ensures that the self-cooling drill bit can maintain sufficient coolant 2c without leakage.

[0079] Please see Figure 1 , Figure 3 As can be seen, the clamping handle 3e is coaxial with the spindle cylinder 2d1, the spindle tube 20, and the drill rod 1;

[0080] Since the self-cooling drill bit is a reusable tool with reusable inner and outer cups, while drill rod 1 is a consumable, it must be replaced periodically during the operation of the self-cooling drill bit. Furthermore, the tail of drill rod 1 is ultimately installed within the fluid reservoir 50 and piston 40 inside the reservoir drum 2. To prevent the coolant 2c inside the drum from leaking out through the wall of drill rod 1, the sealing between drill rod 1 and the contact surface is crucial. Additionally, considering that the reservoir drum 2 has not been equipped with drill rod 1 for some time, only coolant 2c is pre-filled for rapid response and efficiency improvement, allowing for quick insertion of the drill rod and immediate use on-site. Furthermore, the coolant 2c temporarily retained at the opening of the spindle cylinder 2d1 also needs to be leak-proof. Therefore, the reservoir drum 2 requires multiple sealing measures:

[0081] The first is the isolation seal between the central hole rubber plug 22 and the shaft tube 201 leading to the outside of the drum: Please refer to... Figure 3 , Figure 9The inner section (near the drum) of the central hole rubber plug 22 has an annular groove 220 to mate with the annular platform 2011 of the shaft tube 201, so that the outer circumferential curved surface and end face of the annular groove 220 of the central hole rubber plug 22 correspond and fit tightly with the inner circumferential curved surface and end face of the annular platform 2011 of the shaft tube 201. In this way, the contact surface between the outer wall of the central hole rubber plug 22 and the inner wall of the shaft tube 201 is increased and the end face is added as a turning surface, which significantly enhances the sealing effect.

[0082] The second is the sealing measure for the inner end of the central hole of the one-way valve 23 and the central hole plug 22: that is, the sealing when the liquid storage drum 2 is not inserted into the drill rod 1. Please see Figure 4 , Figure 8 Right image, Figure 9 Because the distance between the hanging point of the rubber ball ear 231 on the hanging post 232 and the bottom of the cup can be controlled within the radius of the rubber ball 230, and because the rubber ball ear 231 is stretched and undergoes elastic deformation, the rubber ball ear 231 and the rubber ball 230 together generate elastic force. The rubber ball 230 uses the above-mentioned elastic force to apply pressure to the contact surface of the eccentric socket 225, achieving the effect of sealing the shaft tube 201, so that the liquid storage drum 2 in the standby state can maintain a good sealing state during transportation and storage to meet unforeseen needs.

[0083] Thirdly, the sealing measures for the isolation components between the main cavity of the liquid storage drum 2 and the inner cavity of the shaft cylinder 2d1: Please refer to... Figure 4 , Figure 5 The system comprises a combination of a closing plate 52, a central hole rubber plate 54, and a central hole buckle plate 53 within the liquid-collecting component 50. The isolation between the main cavity of the liquid storage drum 2 and the inner cavity of the shaft cylinder 2d1 is achieved by the edge of the central hole rubber plate 54 abutting against the circumference of the shaft cylinder 2d1 opening. The protruding shank 203 transmits the clamping force from the locking interface 2d00 to the inner cup 20 and from the liquid-collecting component 50 to the circumference of the shaft cylinder 2d1 opening, creating a sealing effect by pressing the edge of the central hole rubber plate 54 against the circumference of the shaft cylinder 2d1 opening. This forms a leak-proof cavity at the opening of the shaft cylinder 2d1, allowing the coolant 2c to accumulate and be easily drawn into the piston 40 before injection.

[0084] In addition, the large sealing ring 211 can also ensure the isolation effect between the inside and outside of the liquid storage drum 2.

[0085] Please see Figure 3 , Figure 4In addition, the sealing measures that need to be explained are as follows: First, the first tight contact point in the path of the drill rod 1 into the reservoir drum 2 is the central hole of the central hole rubber plug 22. Because the elastic central hole of the central hole rubber plug 22 has a large contact area with the outer wall of the drill rod 1, the sealing effect increases with the increase of the area. Then, the second tight contact point passed by the drill rod 1 is the central hole of the central hole rubber plate 54. Since the diameter of the above-mentioned central hole is smaller than the diameter of the drill rod 1, and also because of the provision of the second protrusion 551, the section of the reservoir drum 2 chamber from the central hole rubber plate 54 to the piston 40 is subjected to the impact of the coolant 2c introduced by the liquid-collecting component 50, which causes the second protrusion 551 to be compressed, resulting in it tightening more tightly against the outer wall of the drill rod 1, thus increasing the sealing effect between the chamber and the drill rod 1. These factors ensure that the coolant 2c in the main chamber of the reservoir drum 2 will not leak through the outer wall of the drill rod 1, regardless of whether there is pressure or not.

[0086] Please refer to the following: Figure 3 , Figure 4 As the drill rod 1 penetrates deeper into the piston 40, it enters the first protrusion 451 of the second elastic sheet 45 along the first through hole 401. When the piston 40 compresses the coolant 2c, the pressure causes the coolant 2c to flow through the central hole of the cover plate 46 of the contact spring 48 and through the liquid gap 441 to the lower open pit 4010. Since the drill rod 1 and the first through hole 401 are not fixedly connected, the pressurized coolant 2c seeps into the gap between the tail section of the drill rod 1 and the first through hole 401. When the coolant 2c reaches the first protrusion 451 through this gap, the pressure causes the inner wall of the first protrusion 451 to be pressed more tightly against the outer wall of the drill rod 1. Furthermore, the greater the pressure of the coolant 2c, the greater the force with which the first protrusion 451 clamps the drill rod; the better the sealing effect of the first protrusion 451 on the wall of the drill rod 1.

[0087] Please see Figure 5 In the left figure, the fluid passage 441 of the first elastic film 44 and the surrounding film body are impacted by the pressure of the coolant 2c when the piston 40 squeezes the coolant 2c. Additionally, the rod hole 450 of the second elastic film 45 is smaller than the drill rod 1 body; when the drill rod 1 enters the rod hole 450 and moves relative to it, friction is generated that pulls the entire second elastic film 45. To prevent the first elastic film 44 and the second elastic film 45 from being affected by external forces, anti-slip protrusions 463 are provided on the central hole cover plate 46 to engage the elastic films and ensure that they do not shift.

[0088] The following describes the operating procedures for using the self-cooling drill bit and borehole gauge 80 of this application:

[0089] After receiving the unloaded self-cooling drill bit, first, position the clamping handle 3e of the reservoir drum 2 downwards and the opening of the spindle tube 201 upwards. Then, unscrew the protruding handle 203 of the inner cup 20 counterclockwise from the locking interface 2d00 of the outer cup 2d and pull out the inner cup 20 from the outer cup 2d. Next, pour coolant 2c or water into the outer cup 2d. Then, align the protruding handle 203 of the inner cup 20 with the locking interface 2d00 of the outer cup 2d and slide it in from top to bottom. Insert the inner cup 20 into the outer cup 2d, along with the liquid-collecting part 50, until the edge of the central hole rubber plate 54 is pressed against the circumference of the opening of the spindle tube 2d1. Then, screw it back clockwise to complete the connection and lock it in place. Next, insert the drill rod 1 into the reservoir drum 2 with its tail end aligned with the central hole of the central hole rubber plug 22 in the spindle tube 201. When it can no longer be pushed in, manually turn the drill rod 1 to adjust the angle so that the engagement groove 11 engages with the pin 421. Because the cross-sectional width of the pin 421 is smaller than the width of the engagement groove 11, it can be pushed into place with only a light force. During the above process, whether the inner cup 20 is inserted or the drill rod 1 is inserted, the pressure inside the reservoir drum 2 will increase. At this time, press the exposed core 241 of the balance valve 24 with your finger to disengage the core head 2411 from the through hole 246, creating a gap. This allows the fluid in the cavity to drain out through the gap, balancing the pressure inside the reservoir drum 2 and ensuring smooth installation. The pin 421 and piston 40 are fixedly connected. When the engagement groove 11 is inserted into the pin 421 to form a synchronous installation body, the transmission chain of clamping handle 3e, shaft cylinder 2d1, piston 40, pin 421, and drill rod 1 is completed, and the torque of the electric drill can be smoothly transmitted to the drill rod 1.

[0090] Please see Figure 11 After the positioning work before drilling is completed, whether the positioning is determined by marking lines or marking points, when the hole gauge 80 is attached, the star-shaped viewing slit 82 on the hole gauge 80 can be seen by the operator through the obstruction of the hole gauge 80. This helps to avoid the blind spot of the target body and helps to align the guide hole 81 with the marking, making the hole gauge 80 attached more accurately.

[0091] Please see Figure 10 After the coolant 2c and drill rod 1 are installed, the self-cooling drill is clamped onto the electric drill through the clamping handle 3e. Then, the drill bit is inserted into the guide hole 81 and aligned with the machining surface with the hole gauge 80. Then, the drill is drilled as if it had been drilled into the machining surface normally.

[0092] When the rotating drill bit of drill rod 1 generates heat through friction with the drilled material, the plugging wax 101 inside melts and evaporates. At this time, the operator will see wax vapor escaping from the hole and smell the burning wax odor. This signal reminds the operator that it is time to cool down the self-cooling drill bit. At this time, the operator releases the matching electric drill switch to slow down the self-cooling drill bit, and at the same time releases the feed force of the electric drill, i.e., the force pressing against the bottom of the hole. The coolant 2c in the reservoir drum 2 flows to the funnel 51 under the action of inertia, then flows out through the neck tube 513 and is sucked into the bottom cavity of the shaft cylinder 2d1 through the second through hole 402. At this time, the operator reapplies the feed pressure of the electric drill. The pressure drives the outer cup 2d and the spindle cylinder 2d1 forward towards the hole position through the clamping handle 3d. At the same time, the outer cup 2d also transmits the pressure to the inner cup 20 through the hinge of the clamping interface 2d00 and the protruding handle 203 and the contact surface between the cup mouth of the outer cup body 2d0 and the bottom edge of the inner cup 20. When the piston 40 and the drill rod 1 are stationary in the axial direction, the middle hole rubber plug 22, the second protruding nozzle 551, and the inner wall of the spindle cylinder 2d1, which are in close contact with the drill rod 1 and the piston 40, can swallow the piston 40 and the drill rod 1. This causes the piston 40 to squeeze the coolant 2c in the spindle cylinder 2d1 so that the coolant 2c is sprayed into the bottom of the hole through the inner cooling channel 10.

[0093] It should be noted that other structures and connections in this embodiment can be referred to the relevant description in the previous embodiment, and will not be repeated here.

[0094] The embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A self-cooling drill bit, comprising a drill rod, a reservoir drum, a piston, a coolant catcher, coolant, a clamping shank, and a gauge; the drill rod is a hollow drill rod, and the reservoir drum is a cavity container for containing coolant; the tail section of the drill rod is inserted into the reservoir drum from one end and connected to the reservoir drum, allowing the inner cavity of the drill rod to communicate with the inner cavity of the reservoir drum; the piston is located in the secondary cavity of the reservoir drum; the coolant catcher is located inside the reservoir drum; the clamping shank is fixedly connected to the reservoir drum and coaxial with the drill rod, and the clamping shank is clamped in the chuck of an electric drill; the gauge is a plate-shaped body, and the gauge is pasted onto the machining surface of the hole to be drilled to limit the drill bit's landing point, regulate the drilling position, and prevent the drill bit from deviating. When the reservoir drum rotates due to kinetic energy, the coolant inside the reservoir drum also rotates and absorbs kinetic energy. As a result, the coolant generates inertia and centrifugal force, causing it to adhere tightly to the inner wall of the reservoir drum. Since the coolant is not fixedly connected to the reservoir drum, when the rotational speed of the reservoir drum slows down relative to the rotational speed of the coolant, the coolant enters the catcher due to inertia. The catcher guides the coolant to the end of the piston through its own channel. After the piston draws in the coolant through its reciprocating motion, it squeezes the coolant out through the inner cavity of the drill pipe.

2. The self-cooling drill bit according to claim 1, wherein the hollow drill rod includes a hollow straight-cylinder drill bit with drill bits brazed or sintered with diamond particles and a hollow big-end drill bit, and also includes an internally cooled twist drill bit; characterized in that, The drill rod head has a leak-stopping wax plug in its inner cavity, a side hole on the periphery of the head, and a meshing groove at the tail.

3. The self-cooling drill bit according to claim 1, characterized in that, The liquid storage drum includes an outer cup and an inner cup; the outer cup covers the inner cup; a core cylinder is provided at the foot of the outer cup, the core cylinder being a cavity with an elliptical radial cross-section; the clamping handle is coaxially fixed to the bottom of the core cylinder at its outer end face; a core tube is provided at the foot of the inner cup, the core tube being coaxial with the core cylinder; a one-way valve is provided at the inner end of the core tube, the one-way valve including a rubber ball, a rubber ball lug, and a hanging lug fixed to the bottom of the cup; the hole spacing of the rubber ball lug is smaller than the column spacing between the hanging lugs.

4. The self-cooling drill bit according to claim 3, characterized in that, The shaft cylinder contains a spring and a piston; the spring is located between the piston and the bottom of the shaft cylinder; the piston is a cylinder with an elliptical radial section; the outer circumference of the piston has multiple small annular grooves, each groove containing a small sealing ring; the piston has a first through hole coaxially at its central axis, and the first through hole has two levels of open pits at its two end faces; each of the higher open pits has multiple welded pillars at its bottom; each of the two higher open pits is equipped with a central hole cover plate, each central hole cover plate has a welding hole corresponding to a welded pillar, and the inward-facing surface of the plate has anti-slip protrusions; the two central hole cover plates and the opposite... A first elastic film and a second elastic film are respectively provided between the bottom surfaces of the corresponding high-grade open pit; the first elastic film is located on the side of the pit bottom where the piston is close to the bottom of the shaft cylinder, and a liquid passage slit is provided around the center of the first elastic film; the second elastic film is located on the side of the pit bottom where the piston is away from the bottom of the shaft cylinder, and a rod passage hole is provided at the center of the second elastic film, the diameter of the rod passage hole being smaller than the diameter of the corresponding central hole on the central hole cover plate, and also smaller than the diameter of the drill rod body; a first protrusion is provided around the hole facing the low-grade open pit; both the first and second elastic films are provided with clearance holes at the corresponding welding column.

5. The self-cooling drill bit according to claim 4, characterized in that, The piston has a second through hole parallel to one side of the first through hole; a check plug is provided in the second through hole; the length of the check plug is longer than the depth of the second through hole; the bottom surface of the check plug head is larger than the opening of the second through hole, and the plug head is located at the end of the second through hole near the bottom of the shaft cylinder; the check plug head has multiple tapered sections, the tips of which point towards the tail of the check plug; the tail is provided with an anti-disengagement hook, the total length of which is longer than the width of the second through hole opening, the total width of which is narrower than the width of the second through hole opening, and the total height of which is less than the thickness of the central hole cover plate.

6. The self-cooling drill bit according to claim 4, characterized in that, The piston body is provided with a pin radially at the midpoint of the central axis of the first through hole. The central axis of the pin is perpendicular to the central axis of the first through hole and coaxial with the minor diameter of the outer ellipse of the piston. The cross-sectional width of the pin is smaller than the width of the engagement groove.

7. The self-cooling drill bit according to claim 3, characterized in that, The core tube has an annular platform on its inner wall near the inner port and a pair of symmetrically arranged snap-fit ​​holes on its middle section wall, thereby forming an open receiving cavity facing the outer port of the core tube and having a snap-fit ​​locking function.

8. The self-cooling drill bit according to claim 7, characterized in that, The receiving cavity is provided with a central hole rubber plug, and a retaining lug is provided on the periphery of the central hole rubber plug corresponding to the retaining hole; the inner section of the central hole rubber plug is provided with an annular groove to correspondingly avoid the annular platform; the retaining lug engages with the retaining hole to lock the central hole rubber plug in the receiving cavity; the central hole rubber plug is coaxial with the drill rod and encases the drill rod through its central hole; the inward end face of the central hole rubber plug is provided with an eccentric socket.

9. The self-cooling drill bit according to claim 3, characterized in that, The inner cavity of the inner cup is provided with a liquid-collecting component, and the outer wall is provided with multiple large annular grooves, each of which is embedded with a large sealing ring. The liquid-collecting component is composed of four parts arranged in the direction of extension from the main cavity of the liquid storage drum to the axial cylinder: multiple funnels, a closing plate, a central hole rubber plate, and a central hole buckle plate. The opening of the funnel is rectangular. The closing plate is a circular plate with a central hole. A buckle array is provided on the front of the closing plate. The diameter of the central hole rubber plate is equal to that of the closing plate, and a perforation array is provided on the plate body corresponding to the buckle array. The central hole rubber plate is also provided with a through-hole. The central hole buckle plate is provided with a corresponding buckle array. The buckle array includes a central hole buckle plate, which also has a through-hole. The buckles of the buckle array pass sequentially through the through-hole and buckle holes, releasing elasticity to buckle the central hole buckle plate, thereby clamping the central hole rubber plate between the closing plate and the central hole buckle plate. The diameter of the central hole in the central hole rubber plate is smaller than the diameters of the central holes in the closing plate and the central hole buckle plate, and the three holes are coaxial. The diameter of the central hole in the central hole rubber plate is also smaller than the diameter of the drill rod body. A second protrusion is provided around the central hole on the surface facing the central hole buckle plate. The central hole buckle plate is smaller than the central hole rubber plate, thus exposing the edge of the central hole rubber plate. The funnel comprises three parts: a funnel body, a funnel tube, and a neck tube. The outer surface of the funnel body and the funnel tube are arc-shaped. The funnel is arranged radially along the inner cup wall with the inner cup axis as the origin, and the arc-shaped outer surface of the funnel body is fixedly attached to the inner cup wall. The outer periphery of the tail section of the neck tube is fixedly attached to the closing plate, and the tube opening extends out of the closing plate and then passes through the through holes of the central hole rubber plate and the central hole buckle plate in sequence, protruding out of the central hole buckle plate. The neck tube carries the closing plate and extends to the end towards the shaft cylinder, causing the edge of the central hole rubber plate to abut against the outer periphery of the shaft cylinder opening, thereby isolating the inner cavity of the shaft cylinder from the middle cavity of the liquid storage drum, while facilitating the connection between the funnel and the shaft cylinder.

10. The self-cooling drill bit according to claim 3, characterized in that, The bottom of the outer wall of the inner cup is provided with a protruding handle in an axially symmetrical manner; the outer cup is provided with a locking interface in an axially symmetrical manner near the mouth of the cup, corresponding to the protruding handle, and the locking interface can lock and engage the protruding handle.

11. The self-cooling drill bit according to claim 3, characterized in that, The bottom of the inner cup cavity is provided with a balance valve connecting the inside and outside of the liquid storage drum. The balance valve consists of a through hole on the bottom of the cup, a hanging post, and a film cover installed on the hanging post. There are two hanging posts, symmetrically arranged on both sides of the through hole opening. The film cover has a core post at the center of the side facing the bottom of the cup, a core post head at the base of the core post, and hanging holes at both ends. The film cover is hung on the hanging post through the hanging holes to cover the through hole, and the core post is inserted into the through hole and protrudes from the opening outside the cup. The hole spacing between the hanging holes is smaller than the column spacing between the hanging posts.

12. The self-cooling drill bit according to claim 1, characterized in that, The aperture gauge includes a target body, a guide hole, a star-shaped viewing slit, and an adhesive backing; the guide hole is located at the center of the target body; the star-shaped viewing slit communicates with the guide hole and is arranged radially with the guide hole as the center; the adhesive backing is pasted on the back of the target body.

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