A hole-opening cutter head device with stable center positioning and convenient disassembly and storage

Abstract

The utility model proposes a hole-opening cutter head device with stable center positioning and convenient disassembly and storage, comprising a main drill bit, a cutter handle and a center positioning rod, a first blind hole is provided on the bottom surface of the bottom of the cutter handle, the opening of the first blind hole is circular, the top of the center positioning rod is cylindrical, an elastic damping member is provided between the inner wall of the first blind hole and the top of the center positioning rod after being inserted into the first blind hole; a first blind hole is provided at the center position of the bottom surface of the bottom of the cutter handle; when the center positioning rod is not pressing the object to be opened, a bottom end of the bottom of the center positioning rod protrudes from the bottom surface of the main drill bit, that is, protrudes from the drill mouth end face of the main drill bit; a mounting threaded hole is provided on the top surface of the top of the main drill bit, an external thread is provided on the outer side of the bottom of the cutter handle, and the mounting threaded hole is threadedly connected to the bottom of the cutter handle; the center positioning rod is an elastic compressible and resetting spring telescopic rod; the cutter head device also includes a flange tightening member. The utility model not only improves the center positioning of the cutter head device and the stability of hole opening, but also facilitates disassembly and storage.

Description

Technical Field

[0001] The utility model relates to the technical field of hole openers, and in particular to a hole opening cutter head device which has stable center positioning and is convenient for disassembly, assembly and storage. Background Art

[0002] A hole opener is used to open holes in walls or other hard panels. The hole opener generally includes a drill and a cutter head device installed on the rotating head of the drill. The drill bit of the cutter head device is generally cylindrical, and the wall-breaking end of the drill bit is generally provided with diamond drill teeth. The drill bit utilizes the principle of diamond cutting and breaking rocks to drill holes. During the drilling operation, inaccurate positioning is often encountered. The reason is that the contact area between the diamond drill bit and the drilling surface is large, and the drill bit is difficult to drill in quickly. During the long drilling positioning process, the drill bit will deviate from the predetermined position due to vibration, resulting in poor accuracy of the drilling position. Therefore, a Chinese utility model patent with patent application number 201721731602.X discloses a diamond drill bit that can improve the drilling position accuracy. The diamond drill bit includes a centering drill bit. However, after the centering drill bit is inserted into the blind hole at the head end of the drill shank, the centering drill bit needs to be fixed by a bolt passing through the side wall of the blind hole. Therefore, it is very troublesome to disassemble and assemble the centering drill bit during operation. At the same time, the main drill bit of the diamond drill bit is installed on the head end of the drill shank through threaded cooperation. Once installed, the main drill bit of the diamond drill bit needs to be clamped by a tool and then the drill shank is twisted. Therefore, it is very inconvenient to disassemble and assemble the main drill bit of the diamond drill bit. In addition, the diamond drill bit uses a centering drill bit with cutting threads. When the centering drill bit is used for drilling, the positioning accuracy of the pre-drilled groove opened by the main drill bit of the diamond drill bit will be affected. In the long-term use process, the cutting thread of the centering drill bit is greatly worn, and the cost of replacing accessories is high. In summary, existing diamond drill bits have the disadvantages of unstable center positioning and inconvenient disassembly and storage. Utility Model Content

[0003] In view of this, it is necessary to propose a hole-opening cutter head device with stable center positioning and convenient disassembly and storage to address the above problems, so as to overcome several shortcomings of the above background technology and solve the following technical problems:

[0004] How to conveniently disassemble and store the hole-opening cutter head device while ensuring stable center positioning and hole opening.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] The utility model provides a hole-opening cutter head device with stable center positioning and convenient disassembly and storage, which is used to cooperate with a drilling machine to break the wall and open a hole in an object to be opened. The cutter head device includes a main drill bit, a cutter handle and a center positioning rod. The main drill bit is a cylindrical drill bit structure with a first hollow cavity. The main drill bit is used to break the wall and open a hole. The drill hole of the main drill bit is located at the bottom of the main drill bit and passes through the first hollow cavity. The cutter handle serves as an intermediate connecting piece between the drilling machine and the main drill bit. The top of the cutter handle is used to be installed on the rotating part of the drilling machine, and the bottom of the cutter handle is used to be installed on the rotating part of the drilling machine. A first blind hole is provided on the bottom surface of the drill bit, and after the top of the center positioning rod is inserted into the first hollow cavity of the main drill bit, it can be inserted into the first blind hole in a pluggable manner, the first blind hole has a circular opening, and the top of the center positioning rod is cylindrical, and an elastic damping member is provided between the inner wall surface of the first blind hole and the top of the center positioning rod after being inserted into the first blind hole; when the center positioning rod is not pressing the object to be drilled, a bottom end of the bottom of the center positioning rod protrudes from the bottom surface of the main drill bit, that is, protrudes from the drill hole end surface of the main drill bit;

[0007] A mounting threaded hole is provided on the top surface of the top of the main drill bit, and an external thread is provided on the outer side of the bottom of the tool handle. The mounting threaded hole is threadedly connected with the bottom of the tool handle, so that the top of the main drill bit and the bottom of the tool handle are butt-jointed and installed;

[0008] The center positioning rod is a spring telescopic rod that is elastic and compressible and can be reset; the bottom end structure of the bottom of the center positioning rod is used to drill a positioning pit for the object to be drilled during its own rotation;

[0009] The cutter head device also includes a flange tightening member; the flange tightening member is a barrel-shaped structure, and the flange tightening member includes a barrel bottom plate portion and a barrel body side portion; a first through hole is opened in the middle of the barrel bottom plate portion, and the first through hole is used to penetrate the bottom of the handle and is sleeved on the outside of the bottom of the handle; when the first through hole is sleeved on the outside of the bottom of the handle and the top of the main drill bit is butt-jointed with the bottom of the handle, the bottom surface of the barrel bottom plate portion abuts against the top of the main drill bit, the top surface of the barrel bottom plate portion abuts against the middle of the handle, and the barrel body side portion surrounds the outside of the middle of the handle; at least two first Clamping surface; two first clamping surfaces are parallel; the position of the first clamping surface of the tool handle after installation is higher than the installation position of the flange top clamping piece; the two first clamping surfaces parallel to each other are used to be clamped by a bayonet wrench; at least two second clamping surfaces are provided on the outer side of the barrel body; two second clamping surfaces are parallel; the two second clamping surfaces parallel to each other are used to be clamped by another bayonet wrench; the operator uses a bayonet wrench to clamp the tool handle and another bayonet wrench to clamp the flange top clamping piece, and when the two bayonet wrenches are rotated relative to each other, the threaded installation of the main drill bit and the tool handle is loosened.

[0010] Furthermore, the center positioning rod includes a bottom rod, a middle rod, a top rod and a compression spring; the middle rod is provided with a second hollow cavity for embedding the compression spring, and the two ends of the compression spring elastically press the bottom rod and the top rod respectively; the bottom rod and the middle rod are coaxially detachably connected, and the bottom rod and the middle rod slide relative to each other when the bottom end of the bottom rod is compressed; the middle rod and the top rod are coaxially and detachably threaded; the bottom of the center positioning rod is the bottom rod; the top of the center positioning rod is the top rod.

[0011] Furthermore, the structure of the bottom rod is in the shape of a nail with a nail cap, and the bottom rod includes a nail cap portion and a nail column portion; the bottom end surface and the top end surface of the middle rod are respectively provided with a nail through hole and a spring threaded hole, and the nail through hole and the spring threaded hole both penetrate into the second hollow cavity; the outer diameter of the nail cap portion of the bottom rod is larger than the inner hole diameter of the nail through hole, and the diameter of the nail column portion of the bottom rod is smaller than the inner hole diameter of the nail through hole, and the nail column portion of the bottom rod extends into the nail through hole; the spring threaded hole is provided with an internal thread, and the bottom end portion of the top rod is provided with an external thread, and the portion of the bottom end portion of the top rod provided with the external thread is screwed and installed with the spring threaded hole provided with the internal thread.

[0012] Furthermore, a portion of the top of the center positioning rod extending into the first blind hole is surrounded by a plurality of mounting grooves; each mounting groove is sleeved with an elastic rubber ring; the outer ring diameter of the elastic rubber ring when installed in the mounting groove is larger than the diameter of the first blind hole, so that when the top of the center positioning rod is inserted into the first blind hole, the elastic rubber ring is squeezed by the inner wall surface of the first blind hole and the bottom surface of the corresponding mounting groove.

[0013] Furthermore, the knife handle is provided with a vent hole, which passes through the inner wall of the first blind hole; when the top of the center positioning rod is inserted and pushed into the first blind hole, the air in the first blind hole is squeezed and discharged through the vent hole; when the top of the center positioning rod is pulled outward in the first blind hole, the outside air enters the first blind hole through the vent hole.

[0014] Furthermore, a circular shaft limiting annular platform is convexly provided at the top of the center positioning rod below the elastic rubber ring, and the circular shaft limiting annular platform surrounds the virtual center axis of the center positioning rod, and the outer diameter of the circular shaft limiting annular platform is larger than the inner diameter of the first blind hole; the circular shaft limiting annular platform is used to limit the direction in which the center positioning rod extends into the first blind hole.

[0015] Furthermore, the bottom end structure of the bottom of the center positioning rod is in the shape of a bullet head.

[0016] Furthermore, the bottom end structure of the bottom of the center positioning rod is in an inverted cone shape.

[0017] Furthermore, the bottom end structure of the bottom of the center positioning rod is in the shape of a spherical arch.

[0018] Furthermore, the outer structure of the flange fastening member in the upward direction is hexagonal;

[0019] Furthermore, a second blind hole is provided on the outer side of the middle portion of the knife handle, and the second blind hole is used to facilitate a wrench tool with a hook to rotate and wrench the knife handle.

[0020] The beneficial effects of the utility model are:

[0021] The utility model not only improves the center positioning and hole opening stability of the cutter head device, but also facilitates disassembly, assembly and storage; in the process of positioning pre-drilling, the utility model uses the center positioning rod to drill a center hole in the wall or other hard plate body and uses the cylindrical main drill bit to pre-groove the hole position, thereby accurately and stably leaving a reserved circular groove for breaking the wall and opening the hole. After the operator conveniently pulls out the center positioning rod, the main drill bit continues to break the wall and open the hole stably in the reserved circular groove. The hole opening cutter head device of the utility model is convenient to use whether in the process of center positioning and hole pre-grooving or in the process of continuing the hole opening after the center positioning rod is pulled out. In the process, stable operation can be achieved; wherein, the installation method of the center positioning rod and the first blind hole can not only make it convenient for the operator to pull out and insert the center positioning rod, but also achieve the stability of the center positioning rod after installation, thereby improving the working efficiency and avoiding the risk of excessive loss of maintenance parts; the utility model enables the operator to clamp a bayonet wrench of the tool handle and another bayonet wrench of the flange tightening piece, and relatively pull the two bayonet wrenches, so as to conveniently loosen the threaded installation of the main drill bit and the tool handle, thereby realizing convenient disassembly of the main drill bit, the tool handle and the center positioning rod, so that the tool head device can be more conveniently and compactly stored in the tool box. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of a half-section structure of a hole-opening cutter head device of the utility model, which has stable center positioning and is convenient for disassembly and storage;

[0023] Figure 2 It is a front view structural diagram of the flange tightening member involved in the utility model;

[0024] Figure 3 It is a half-section structural schematic diagram of the flange pressing member involved in the utility model in the front view direction;

[0025] Figure 4 It is a schematic diagram of the structure of the flange tightening member involved in the utility model in a top view;

[0026] Figure 5 It is a schematic diagram of the structure of the flange tightening member involved in the utility model when viewed from bottom;

[0027] Figure 6 It is a schematic diagram of the structure of the knife handle involved in the utility model when viewed from above;

[0028] Figure 7 It is a schematic diagram of a half-section structure of the main drill bit involved in the utility model in the front view direction;

[0029] Figure 8 It is a schematic diagram of the structure of the main drill bit involved in the utility model from a top view;

[0030] Fig. 9 This is a schematic diagram of the structure of the main drill bit involved in the utility model when viewed from above;

[0031] Fig.10 It is a structural schematic diagram of the knife handle involved in the utility model in a front view;

[0032] Fig.11 This is a schematic diagram of the structure of the knife handle involved in the utility model when viewed from above;

[0033] Fig.12 It is a half-section structural schematic diagram of the center positioning rod involved in the utility model in the front view direction;

[0034] Fig.13 It is a partial structural schematic diagram of the installation groove of the center positioning rod involved in the utility model in the front view direction;

[0035] Fig.14 It is a partial structural schematic diagram of the center positioning rod with an elastic rubber ring installed in the front view of the utility model;

[0036] Fig.15 It is a structural schematic diagram of the bottom rod member involved in the utility model in a front view;

[0037] Fig.16 It is a half-section structural schematic diagram of the middle rod member involved in the utility model in the front view direction;

[0038] Fig.17 It is a half-section structural schematic diagram of the top rod member involved in the utility model in the front view direction;

[0039] Description of reference numerals:

[0040] Main drill bit 1; tool handle 2; center positioning rod 3; elastic rubber ring 4; flange tightening member 5; barrel bottom plate portion 51; barrel body side portion 52; first through hole 511; second clamping surface 521; first clamping surface 22; first blind hole 21; second blind hole 24; vent 23; mounting groove 31; bottom rod 32; middle rod 33; top rod 34; compression spring 35; outer ring diameter R1 of elastic rubber ring 4 mounted on mounting groove 31; nail cap portion 321; nail column portion 322; nail through hole 331; spring threaded hole 332; circular shaft limiting annular platform 36; first hollow cavity 11; second hollow cavity 333; mounting threaded hole 12. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be further clearly and completely described below in combination with the embodiments of the utility model. It should be noted that the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0042] It should be understood that the directions or positional relationships indicated by terms such as "upper", "lower", "front", "back", "left", and "right" are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the present invention.

[0043] The terms "first", "second", "third", "fourth", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the definition of "first", "second", "third", "fourth" features may explicitly or implicitly include one or more of the features.

[0044] Example 1

[0045] like Figure 1-Figure 17 As shown:

[0046] The present embodiment provides a hole-piercing cutter head device with stable center positioning and convenient disassembly and storage, which is used to cooperate with a drilling rig to break the wall and make a hole in the object to be drilled. The cutter head device includes a main drill bit 1, a cutter handle 2 and a center positioning rod 3. The main drill bit 1 is a cylindrical drill bit structure with a first hollow cavity 11. The main drill bit 1 is used to break the wall and make a hole. The drill hole of the main drill bit 1 is located at the bottom of the main drill bit 1 and passes through the first hollow cavity 11; the cutter handle 2 serves as an intermediate connecting piece between the drilling rig and the main drill bit 1. The top of the cutter handle 2 is used to be installed on the rotating part of the drilling rig, and the bottom surface of the bottom of the cutter handle 2 A first blind hole 21 is provided. After the top of the center positioning rod 3 is inserted into the first hollow cavity 11 of the main drill bit 1, it can be inserted into the first blind hole 21 in a pluggable manner. The first blind hole 21 has a circular opening. The top of the center positioning rod 3 is cylindrical. An elastic damping member is provided between the inner wall surface of the first blind hole 21 and the top of the center positioning rod 3 after being inserted into the first blind hole 21. When the center positioning rod 3 is not pressing against the object to be drilled, a bottom end of the bottom of the center positioning rod 3 protrudes from the bottom surface of the main drill bit 1, that is, protrudes from the drill end surface of the main drill bit 1.

[0047] A mounting threaded hole 12 is provided on the top surface of the top of the main drill bit 1, and an external thread is provided on the outer side of the bottom of the handle 2. The mounting threaded hole 12 is threadedly connected with the bottom of the handle 2, so that the top of the main drill bit 1 and the bottom of the handle 2 are butt-jointed and installed;

[0048] The center positioning rod 3 is a spring telescopic rod that is elastically compressible and resetting; the bottom end structure of the bottom of the center positioning rod 3 is used to drill a positioning pit for the object to be drilled during its own rotation;

[0049] The tool head device also includes a flange tightening member 5; the flange tightening member 5 is a barrel-shaped structure, and the flange tightening member 5 includes a barrel bottom plate portion 51 and a barrel body side portion 52; a first through hole 511 is opened in the middle of the barrel bottom plate portion 51, and the first through hole 511 is used to penetrate the bottom of the tool handle 2 and be sleeved on the outside of the bottom of the tool handle 2; when the first through hole 511 is sleeved on the outside of the bottom of the tool handle 2 and the top of the main drill bit 1 is docked with the bottom of the tool handle 2, the bottom surface of the barrel bottom plate portion 51 abuts against the top of the main drill bit 1, the top surface of the barrel bottom plate portion 51 abuts against the middle of the tool handle 2, and the barrel body side portion 52 surrounds the outside of the middle of the tool handle 2; at least Two first clamping surfaces 22; wherein the two first clamping surfaces 22 are parallel; the position of the first clamping surface 22 of the tool handle 2 after installation is higher than the installation position of the flange top tightening member 5; the two first clamping surfaces 22 parallel to each other are used to be clamped by a bayonet wrench; at least two second clamping surfaces 521 are provided on the outer side of the barrel body side 52; wherein the two second clamping surfaces 521 are parallel; the two second clamping surfaces 521 parallel to each other are used to be clamped by another bayonet wrench; the operator uses a bayonet wrench to clamp the tool handle 2 and another bayonet wrench to clamp the flange top tightening member 5, and when the two bayonet wrenches are rotated relative to each other, the threaded installation of the main drill bit 1 and the tool handle 2 is loosened.

[0050] Optimally, the center positioning rod 3 includes a bottom rod 32, a middle rod 33, a top rod 34 and a compression spring 35; the middle rod 33 is provided with a second hollow cavity 333 for embedding the compression spring 35, and the two ends of the compression spring 35 elastically press the bottom rod 32 and the top rod 34 respectively; the bottom rod 32 and the middle rod 33 are coaxially detachably connected, and the bottom rod 32 and the middle rod 33 slide displaced with each other when the bottom end of the bottom rod 32 is compressed; the middle rod 33 and the top rod 34 are coaxially and detachably threadedly connected; the bottom of the center positioning rod 3 is the bottom rod 32; the top of the center positioning rod 3 is the top rod 34.

[0051] Optimally, the structure of the bottom rod 32 is in the shape of a nail with a nail cap, and the bottom rod 32 includes a nail cap portion 321 and a nail column portion 322; the bottom end surface and the top end surface of the middle rod 33 are respectively provided with a nail through hole 331 and a spring threaded hole 332, and the nail through hole 331 and the spring threaded hole 332 both penetrate into the second hollow cavity 333; the outer diameter of the nail cap portion 321 of the bottom rod 32 is larger than the inner hole diameter of the nail through hole 331, and the diameter of the nail column portion 322 of the bottom rod 32 is smaller than the inner hole diameter of the nail through hole 331, and the nail column portion 322 of the bottom rod 32 extends into the nail through hole 331; the spring threaded hole 332 is provided with an internal thread, and the bottom end portion of the top rod 34 is provided with an external thread, and the portion of the bottom end portion of the top rod 34 provided with the external thread is screwed and installed with the spring threaded hole 332 provided with the internal thread.

[0052] Optimally, a portion of the top of the center positioning rod 3 that extends into the first blind hole 21 is surrounded by a plurality of mounting grooves 31; each mounting groove 31 is sleeved with an elastic rubber ring 4; the outer ring diameter R1 of the elastic rubber ring 4 when installed in the mounting groove 31 is larger than the diameter of the first blind hole 21, so that when the top of the center positioning rod 3 is inserted into the first blind hole 21, the elastic rubber ring 4 is squeezed by the inner wall surface of the first blind hole 21 and the bottom surface of the corresponding mounting groove 31.

[0053] Optimally, the shank 2 is provided with a vent hole 23, which passes through the inner wall of the first blind hole 21; when the top of the center positioning rod 3 is inserted and pushed into the first blind hole 21, the air in the first blind hole 21 is squeezed and discharged through the vent hole 23; when the top of the center positioning rod 3 is pulled outward in the first blind hole 21, the outside air enters the first blind hole 21 through the vent hole 23.

[0054] Optimally, a circular shaft limiting annular platform 36 is convexly provided at the top of the center positioning rod 3 below the elastic rubber ring 4. The circular shaft limiting annular platform 36 surrounds the virtual center axis of the center positioning rod 3. The outer diameter of the circular shaft limiting annular platform 36 is larger than the inner diameter of the first blind hole 21. The circular shaft limiting annular platform 36 is used to limit the direction in which the center positioning rod 3 extends into the first blind hole 21.

[0055] Optimally, the bottom end structure of the bottom of the center positioning rod 3 is in the shape of a bullet head, an inverted cone, or a spherical arch.

[0056] Optimally, the outer structure of the flange fastening member 5 when viewed from above is hexagonal.

[0057] Optimally, a second blind hole 24 is provided on the outer side of the middle part of the handle 2, and the second blind hole 24 is used to facilitate the wrench tool with a hook to rotate and pull the handle 2; among them, the Chinese patent document with application number 201510784411.9 discloses an improved technical solution for the above-mentioned wrench tool with a hook.

[0058] Specifically, when the nail head of the nail column portion 322 of the bottom rod 32 is worn, a grinder can be used to grind the nail head, or the top rod 34 can be unscrewed and removed from the spring threaded hole 332, and then the compression spring 35 can be taken out (in this way, the damaged compression spring 35 can be replaced), and then the bottom rod 32 can be removed from the spring threaded hole 332, thereby replacing a new bottom rod 32.

[0059] The instructions for use of the hole opening cutter head device of the utility model are as follows:

[0060] Install the top of the handle 2 of the hole-punching cutter head device on the rotating part of the drilling machine (such as a hand drill) and lock it, mark the positioning on the wall, align the bottom end structure of the bottom of the center positioning rod 3 with the positioning mark on the wall and press it, turn on the drilling machine, so that a positioning pit corresponding to the position of the positioning mark and a drill mark pre-drilled by the main drill bit 1 are left on the wall, pull out the center positioning rod 3 by hand, and drill the main drill bit 1 deep into the wall along the drill mark left by the pre-drilling; turn off the power, insert the center positioning rod 3 into the first blind hole 21 for next use.

[0061] The disassembly instructions of the hole opening cutter head device of the utility model are as follows:

[0062] Pull out the center positioning rod 3 by hand, and loosen the threaded installation of the main drill bit 1 and the tool handle 2 by relatively rotating a bayonet wrench holding the tool handle 2 and another bayonet wrench holding the flange tightening piece 5. Then store the main drill bit 1, the tool handle 2, the center positioning rod 3, and the flange tightening piece 5. If the storage space needs to be further compressed, the center positioning rod 3 can be further disassembled.

[0063] The above-mentioned embodiments only express several implementation methods of the utility model, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent of the utility model. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the utility model, and these all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A hole-piercing cutter head device with stable center positioning and convenient disassembly and storage, used for cooperating with a drilling machine to break the wall and make a hole in an object to be drilled, the cutter head device comprising a main drill bit (1), a cutter handle (2) and a center positioning rod (3), the main drill bit (1) is a cylindrical drill bit structure provided with a first hollow cavity (11), and the main drill bit (1) is used for breaking the wall and making a hole; the drill hole of the main drill bit (1) is located at the bottom of the main drill bit (1) and passes through the first hollow cavity (11); the cutter handle (2) serves as an intermediate connecting piece between the drilling machine and the main drill bit (1), the top of the cutter handle (2) is used to be installed on the rotating part of the drilling machine, and the bottom surface of the bottom of the cutter handle (2) is provided with a first blind hole (21), characterized in that After the top of the center positioning rod (3) extends into the first hollow cavity (11) of the main drill bit (1), it can be inserted into the first blind hole (21) in a pluggable manner; the first blind hole (21) has a circular opening, the top of the center positioning rod (3) is cylindrical, and an elastic damping member is provided between the inner wall surface of the first blind hole (21) and the top of the center positioning rod (3) after being inserted into the first blind hole (21); when the center positioning rod (3) is not pressing against the object to be drilled, a bottom end of the bottom of the center positioning rod (3) protrudes from the bottom surface of the main drill bit (1), that is, protrudes from the drilling end surface of the main drill bit (1); A mounting threaded hole (12) is provided on the top surface of the top of the main drill bit (1), and an external thread is provided on the outer side of the bottom of the tool handle (2). The mounting threaded hole (12) is threadedly connected to the bottom of the tool handle (2), so that the top of the main drill bit (1) and the bottom of the tool handle (2) are butt-jointed and installed; The center positioning rod (3) is a spring telescopic rod that is elastic and compressible and can be reset; the bottom end structure of the bottom of the center positioning rod (3) is used to drill a positioning pit for the object to be drilled during its own rotation; The cutter head device also includes a flange tightening member (5); the flange tightening member (5) is in a barrel-shaped structure, and includes a barrel bottom plate portion (51) and a barrel body side portion (52); a first through hole (511) is opened in the middle of the barrel bottom plate portion (51), and the first through hole (511) is used to penetrate the bottom of the knife handle (2) and be sleeved on the outside of the bottom of the knife handle (2); when the first through hole (511) is sleeved on the outside of the bottom of the knife handle (2) and the top of the main drill bit (1) is butt-jointed with the bottom of the knife handle (2), the bottom surface of the barrel bottom plate portion (51) abuts against the top of the main drill bit (1), the top surface of the barrel bottom plate portion (51) abuts against the middle of the knife handle (2), and the barrel body side portion (52) surrounds the outside of the middle of the knife handle (2); the middle of the knife handle (2) At least two first clamping surfaces (22) are provided on the outside; the two first clamping surfaces (22) are parallel; the position of the first clamping surface (22) of the installed tool handle (2) is higher than the installation position of the flange pressing member (5); the two mutually parallel first clamping surfaces (22) are used to be clamped by a bayonet spanner; at least two second clamping surfaces (521) are provided on the outside of the barrel body side portion (52); the two second clamping surfaces (521) are parallel; the two mutually parallel second clamping surfaces (521) are used to be clamped by another bayonet spanner; an operator clamps one bayonet spanner of the tool handle (2) and another bayonet spanner of the flange pressing member (5), and when the two bayonet spanners are relatively rotated and pulled, the threaded installation of the main drill bit (1) and the tool handle (2) is loosened.

2. The hole-piercing cutter head device with stable center positioning and convenient disassembly and storage according to claim 1 is characterized in that: The center positioning rod (3) comprises a bottom rod (32), a middle rod (33), a top rod (34) and a compression spring (35); the middle rod (33) is provided with a second hollow cavity (333) for embedding the compression spring (35), and the two ends of the compression spring (35) elastically press against the bottom rod (32) and the top rod (34) respectively; the bottom rod (32) and the middle rod (33) are coaxially detachably connected, and the bottom rod (32) and the middle rod (33) slide in a displaced manner relative to each other when the bottom end of the bottom rod (32) is compressed; the middle rod (33) and the top rod (34) are coaxially and detachably threadedly connected; the bottom of the center positioning rod (3) is the bottom rod (32); and the top of the center positioning rod (3) is the top rod (34).

3. The hole-piercing cutter head device with stable center positioning and convenient disassembly and storage according to claim 2 is characterized in that: The structure of the bottom rod (32) is in the shape of a nail with a nail cap, and the bottom rod (32) comprises a nail cap portion (321) and a nail column portion (322); the bottom end surface and the top end surface of the middle rod (33) are respectively provided with a nail through hole (331) and a spring threaded hole (332), and the nail through hole (331) and the spring threaded hole (332) both penetrate into the second hollow cavity (333); the outer diameter of the nail cap portion (321) of the bottom rod (32) is larger than the outer diameter of the nail through hole ( The inner hole diameter of the bottom rod (32) is smaller than the inner hole diameter of the nail through hole (331), and the nail column (322) of the bottom rod (32) extends into the nail through hole (331); the spring threaded hole (332) is provided with an internal thread, and the bottom end of the top rod (34) is provided with an external thread. The bottom end of the top rod (34) is screwed and installed with the external thread and the spring threaded hole (332) provided with the internal thread.

4. The hole-piercing cutter head device with stable center positioning and convenient disassembly and storage according to claim 1 is characterized in that: A portion of the top of the center positioning rod (3) extending into the first blind hole (21) is surrounded by a plurality of mounting grooves (31); each mounting groove (31) is sleeved with an elastic rubber ring (4); the outer ring diameter (R1) of the elastic rubber ring (4) when installed in the mounting groove (31) is larger than the diameter of the first blind hole (21), so that when the top of the center positioning rod (3) is inserted into the first blind hole (21), the elastic rubber ring (4) is squeezed by the inner wall surface of the first blind hole (21) and the bottom surface of the corresponding mounting groove (31).

5. The hole-piercing cutter head device with stable center positioning and convenient disassembly and storage according to claim 4 is characterized in that: The knife handle (2) is provided with a ventilation hole (23), and the ventilation hole (23) passes through the inner wall surface of the first blind hole (21); when the top of the center positioning rod (3) is inserted into the first blind hole (21), the air in the first blind hole (21) is squeezed out through the ventilation hole (23); when the top of the center positioning rod (3) is pulled outward from the first blind hole (21), the outside air enters the first blind hole (21) through the ventilation hole (23).

6. The hole-piercing cutter head device with stable center positioning and convenient disassembly and storage according to claim 4 is characterized in that: A circular shaft limiting annular platform (36) is convexly provided at a portion of the top of the center positioning rod (3) located below the elastic rubber ring (4). The circular shaft limiting annular platform (36) surrounds the virtual center axis of the center positioning rod (3). The outer diameter of the circular shaft limiting annular platform (36) is greater than the inner diameter of the first blind hole (21). The circular shaft limiting annular platform (36) is used to limit the direction in which the center positioning rod (3) extends into the first blind hole (21).

7. The hole-piercing cutter head device with stable center positioning and convenient disassembly and storage according to any one of claims 1 to 6, characterized in that: The bottom end structure of the bottom of the center positioning rod (3) is in the shape of a bullet head.

8. The hole-piercing cutter head device with stable center positioning and convenient disassembly and storage according to any one of claims 1 to 6, characterized in that: The bottom end structure of the bottom of the center positioning rod (3) is in an inverted cone shape.

9. The hole-piercing cutter head device with stable center positioning and convenient disassembly and storage according to any one of claims 1 to 6, characterized in that: The bottom end structure of the bottom of the center positioning rod (3) is in the shape of a spherical arch.

10. The hole-piercing cutter head device with stable center positioning and convenient disassembly and storage according to any one of claims 1 to 6, characterized in that: The outer structure of the flange tightening member (5) when viewed from above is hexagonal; A second blind hole (24) is provided on the outer side of the middle part of the knife handle (2), and the second blind hole (24) is used to facilitate a wrench tool with a hook to rotate and wrench the knife handle (2).

Images