A cutter head device with convenient disassembly and assembly of a center positioning rod and stable positioning and hole opening

Abstract

The utility model proposes a cutter head device that is convenient to disassemble and assemble a center positioning rod and has stable positioning and hole opening, which is used to cooperate with a drilling machine to open a hole. 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 provided with a first hollow cavity, and the bottom surface of the main drill bit for opening a hole is drilled; the cutter handle is used as an intermediate connecting piece between the drilling machine and the main drill bit, and the top of the cutter handle is used to be installed on the rotating part of the drilling machine. A blind hole is provided on the bottom surface of the bottom of the cutter handle. The top of the center positioning rod is inserted into the first hollow cavity of the main drill bit and can be inserted into the blind hole in a pluggable manner. The blind hole is circular in opening, and the top of the center positioning rod is cylindrical. A portion of the top of the center positioning rod that extends into the blind hole is surrounded by a plurality of mounting grooves; each mounting groove is sleeved with an elastic rubber ring. The utility model enables the cutter head device to conveniently and stably perform center positioning and conveniently disassemble and assemble the center positioning rod, thereby facilitating stable hole opening.

Description

Technical Field

[0001] The utility model relates to the technical field of hole openers, and in particular to a cutter head device which is convenient for disassembling and assembling a center positioning rod and has stable positioning and hole opening. 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, the Chinese utility model patent with patent application number 201721731602.X discloses a diamond drill bit that can improve the accuracy of drilling position. 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 bolts. Therefore, in the actual hole opening operation, the construction personnel will use a centering drill bit with cutting threads due to the troublesome process of disassembling the centering drill bit or adjusting the position of the centering drill bit. When drilling with the centering drill bit when turning the hole, this will result in slow operation efficiency, especially when drilling deep holes. The hole opening stability is poor due to the presence of the centering drill bit. There is also the problem of large wear of the cutting thread of the center positioning rod. If frequent operations are performed, the center positioning rod needs to be replaced frequently. The blind hole of the diamond drill bit of this patent adopts a square structure. Although it can effectively drive the centering drill bit to rotate to facilitate drilling, the blind hole structure is easily damaged during frequent operations, so it is necessary to replace accessories with higher costs. Utility Model Content

[0003] In view of this, it is necessary to propose a cutter head device that is convenient for disassembling and assembling the center positioning rod and has stable positioning and hole opening to overcome the shortcomings of the above-mentioned background technology and solve the following technical problems:

[0004] How to make the cutter head device conveniently and stably perform center positioning and conveniently disassemble and assemble the center positioning rod, so as to facilitate stable hole opening.

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

[0006] The utility model provides a cutter head device which is convenient for disassembling and assembling a center positioning rod and has stable positioning and hole opening, and is used for cooperating with a drilling machine to break a wall and open a hole in an object to be opened. The cutter head device comprises a main drill head, a cutter handle and a center positioning rod. The main drill head is a cylindrical drill head structure provided with a first hollow cavity, and a drill opening is provided on the bottom surface of the main drill head for opening a hole; the cutter handle serves as an intermediate connecting piece between the drilling machine and the main drill head, and the top of the cutter handle is used to be installed on the rotating part of the drilling machine, and a blind hole is provided on the bottom surface of the bottom of the cutter handle, and the top of the center positioning rod is provided with a blind hole. The center positioning rod is inserted into the first hollow cavity of the main drill bit and can be inserted into the blind hole in a pluggable manner. The blind hole has a circular opening. The top of the center positioning rod is cylindrical. The part of the top of the center positioning rod that extends into the 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 blind hole, so that when the top of the center positioning rod is inserted into the blind hole, the elastic rubber ring is squeezed by the inner wall surface of the blind hole and the bottom surface of the corresponding mounting groove.

[0007] 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.

[0008] Furthermore, a blind hole is provided at the center of the bottom surface of the bottom of the handle.

[0009] Furthermore, when the center positioning rod is not pressing against 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 end surface of the main drill bit.

[0010] Furthermore, the center positioning rod is an elastically compressible and resetting spring telescopic rod.

[0011] Furthermore, the bottom end structure of the bottom of the center positioning rod is in a bullet shape.

[0012] Furthermore, the bottom end structure of the bottom of the center positioning rod is in an inverted cone shape.

[0013] Furthermore, the bottom end structure of the bottom of the center positioning rod is in the form of a spline, a cross knife, a slotted knife or a twist drill.

[0014] 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.

[0015] 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.

[0016] 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 greater than the inner diameter of the blind hole; the circular shaft limiting annular platform is used to limit the direction in which the center positioning rod extends into the blind hole;

[0017] The knife handle is provided with a vent hole which passes through the inner wall of the blind hole. When the top of the center positioning rod is inserted into the blind hole, the air in the blind hole is squeezed out through the vent hole. When the top of the center positioning rod is pulled outward in the blind hole, the outside air enters the blind hole through the vent hole.

[0018] The beneficial effects of the utility model are:

[0019] The utility model discloses a cutter head device which is convenient for disassembling and assembling a center positioning rod and has stable positioning and hole opening. During the positioning pre-drilling process, a center drilling pit is made in a wall or other hard plate body through the center positioning rod and a hole position pre-grooving is made through a cylindrical main drill bit, thereby accurately and stably leaving a reserved groove corresponding to the hole opening. After the operator conveniently pulls out the center positioning rod, the operator continues to stably drill the hole in the reserved groove through the main drill bit. The cutter head device of the utility model can realize stable operation in the center positioning process and the hole position pre-grooving process, as well as the hole opening process continued after the center positioning rod is pulled out, and the latter stable operation process depends on the former stable operation process. Among them, the installation method of the center positioning rod and the blind hole makes it convenient for the operator to pull out and insert the center positioning rod and the center positioning rod can be detachably installed stably, thereby improving the working efficiency and avoiding the risk of excessive loss of accessories. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of a half-section structure of a cutter head device of the utility model, which is convenient for disassembling and assembling a center positioning rod and has stable positioning and hole opening;

[0021] Figure 2 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;

[0022] Figure 3 It is a schematic diagram of a half-section structure of a main drill bit involved in the utility model in a top view;

[0023] Figure 4 It is a schematic diagram of a half-section structure of the main drill bit involved in the utility model when viewed from the bottom;

[0024] Figure 5 It is a structural schematic diagram of the knife handle involved in the utility model in a front view;

[0025] Figure 6 This is a schematic diagram of the structure of the knife handle involved in the utility model when viewed from above;

[0026] Figure 7 It is a half-section structural schematic diagram of the center positioning rod involved in the utility model in the front view direction;

[0027] Figure 8 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;

[0028] Fig. 9 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;

[0029] Fig.10 It is a structural schematic diagram of the bottom rod member involved in the utility model in a front view;

[0030] Fig.11 It is a half-section structural schematic diagram of the middle rod member involved in the utility model in the front view direction;

[0031] Fig.12 It is a half-section structural schematic diagram of the top rod member involved in the utility model in the front view direction;

[0032] Description of reference numerals:

[0033] Main drill bit 1; tool handle 2; center positioning rod 3; elastic rubber ring 4; blind hole 21; vent hole 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 part 321; nail column part 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

[0034] 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.

[0035] 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.

[0036] 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.

[0037] Example 1

[0038] like Figure 1-Figure 9 As shown:

[0039] The present embodiment provides a cutter head device which is convenient for disassembling and assembling a center positioning rod and has stable positioning and hole opening, and is used to cooperate with a drilling machine to break a wall and open a hole in an object to be opened. The cutter head device includes a main drill head 1, a shank 2 and a center positioning rod 3. The main drill head 1 is a cylindrical drill head structure provided with a first hollow cavity 11. The bottom surface of the main drill head 1 for opening a hole is provided with a drill hole (such as Figure 1 As shown); the handle 2 is used as an intermediate connecting piece between the drill and the main drill bit 1. The top of the handle 2 is used to be installed on the rotating part of the drill. A blind hole 21 is provided on the bottom surface of the bottom of the handle 2. The top of the center positioning rod 3 is inserted into the first hollow cavity 11 of the main drill bit 1 and can be plugged into the blind hole 21. The blind hole 21 is circular in opening. The top of the center positioning rod 3 is cylindrical. The part of the top of the center positioning rod 3 that extends into the blind hole 21 is surrounded by a plurality of mounting grooves 31 (in this embodiment, one mounting groove 31 is preferably provided, as shown in FIG. 1 ). Figure 7 Each mounting groove 31 is provided with an elastic rubber ring 4; the outer diameter R1 of the elastic rubber ring 4 when installed in the mounting groove 31 (as shown); Fig. 9 ) is larger than the diameter of the blind hole 21, so that when the top of the center positioning rod 3 is inserted into the blind hole 21, the elastic rubber ring 4 is squeezed by the inner wall surface of the blind hole 21 and the bottom surface of the corresponding installation groove 31;

[0040] 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.

[0041] Optimally, a blind hole 21 is provided at the center of the bottom surface of the bottom of the handle 2 .

[0042] Optimally, 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 .

[0043] Specifically, a mounting threaded hole 12 is provided on the top surface of the top of the main drill bit 1 , and the mounting threaded hole 12 is used for docking and mounting with the tool handle 2 ; an external thread is provided on the outer side of the bottom of the tool handle 2 .

[0044] Example 2

[0045] Embodiment 2 is optimized based on any technical solution of Embodiment 1;

[0046] The center positioning rod of this embodiment is a spring telescopic rod that is elastically compressible and resetting.

[0047] Optimally, the bottom end structure of the bottom of the center positioning rod is bullet-shaped, cone-shaped, spline-shaped, cross-knife-shaped, slotted-knife-shaped or twist drill-shaped.

[0048] Example 3

[0049] Embodiment 3 is optimized based on any one of the technical solutions in Embodiment 2;

[0050] like Figure 1-Figure 12 As shown:

[0051] The center positioning rod 3 of this embodiment 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.

[0052] 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.

[0053] 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.

[0054] Specifically, a bottom end of the bottom of the center positioning rod 3 described in Example 1 is the bottom end of the bottom rod 32 described in Example 3.

[0055] Embodiment 4 is a further optimization of Embodiment 1;

[0056] like Figure 1-Figure 12 As shown:

[0057] The top of the center positioning rod 3 of this embodiment is provided with a circular shaft limiting annular platform 36 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 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 blind hole 21.

[0058] Embodiment 5 is a further optimization of embodiment 1;

[0059] like Figure 1-Figure 12 As shown:

[0060] The handle 2 is provided with a vent hole 23 (such as Figure 5 As shown), the vent hole 23 passes through the inner wall of the blind hole 21; when the top of the center positioning rod 3 is inserted into the blind hole 21, the air in the blind hole 21 is squeezed and discharged through the vent hole 23, and when the top of the center positioning rod 3 is pulled outward in the blind hole 21, the outside air enters the blind hole 21 through the vent hole 23.

[0061] The use process of the cutter head device of the utility model is as follows:

[0062] Install the top of the handle 2 of the cutter head device on the rotating part of the drill (such as a hand drill) and lock it, mark the location on the wall, point the bottom end of the center positioning rod 3 to the positioning mark on the wall, turn on the drill, and leave a pit corresponding to the location of the positioning mark and a drill mark pre-drilled by the main drill bit 1 on the wall. Pull out the center positioning rod 3 by hand, and use the main drill bit 1 to drill deep into the wall along the drill mark left by the pre-drilling.

[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 cutter head device with a convenient disassembly and assembly of a center positioning rod and stable positioning and hole opening, used for cooperating with a drilling machine to break the wall and open a hole in an object to be opened, 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) being a cylindrical drill bit structure provided with a first hollow cavity (11), the bottom surface of the main drill bit (1) for opening a hole being provided with a drill opening; the cutter handle (2) serving as an intermediate connecting piece between the drilling machine and the main drill bit (1), the top of the cutter handle (2) being used for being installed on the rotating part of the drilling machine, the bottom surface of the bottom of the cutter handle (2) being provided with a blind hole (21), characterized in that: The top of the center positioning rod (3) is inserted into the first hollow cavity (11) of the main drill bit (1) and then inserted into the blind hole (21) in a pluggable manner. The blind hole (21) is a circular opening. The top of the center positioning rod (3) is cylindrical. The portion of the top of the center positioning rod (3) that extends into the blind hole (21) is surrounded by a plurality of mounting grooves (31). Each mounting groove (31) is sleeved with an elastic rubber ring (4). When the elastic rubber ring (4) is installed in the mounting groove (31), the outer ring diameter (R1) is larger than the diameter of the blind hole (21), so that when the top of the center positioning rod (3) is inserted into the blind hole (21), the elastic rubber ring (4) is squeezed by the inner wall surface of the blind hole (21) and the bottom surface of the corresponding mounting groove (31). The bottom end structure of the bottom of the central positioning rod (3) is used to drill a positioning pit for the object to be drilled during its own rotation.

2. The cutter head device with convenient disassembly and assembly of the center positioning rod and stable positioning and hole opening according to claim 1, characterized in that: A blind hole (21) is provided at the center of the bottom surface of the bottom of the knife handle (2).

3. The cutter head device with convenient disassembly and assembly of the center positioning rod and stable positioning and hole opening according to claim 1, characterized in that: 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).

4. The cutter head device with convenient disassembly and assembly of the center positioning rod and stable positioning and hole opening according to any one of claims 1 to 3, characterized in that: The center positioning rod (3) is a spring telescopic rod that is elastic and compressible and can be reset.

5. The cutter head device with convenient disassembly and assembly of the center positioning rod and stable positioning and hole opening according to claim 4, characterized in that: The bottom end structure of the bottom of the center positioning rod (3) is in the shape of a bullet head.

6. The cutter head device with convenient disassembly and assembly of the center positioning rod and stable positioning and hole opening according to claim 4, characterized in that: The bottom end structure of the bottom of the center positioning rod (3) is in an inverted cone shape.

7. The cutter head device with convenient disassembly and assembly of the center positioning rod and stable positioning and hole opening according to claim 3, characterized in that: The bottom end structure of the bottom of the center positioning rod (3) is in the form of a spline, a cross knife, a slotted knife or a twist drill.

8. The cutter head device with convenient disassembly and assembly of the center positioning rod and stable positioning and hole opening according to claim 4, 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).

9. The cutter head device with convenient disassembly and assembly of the center positioning rod and stable positioning and hole opening according to claim 8, 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.

10. The cutter head device with convenient disassembly and assembly of the center positioning rod and stable positioning and hole opening according to any one of claims 1 to 3, characterized in that: A circular shaft limiting annular platform (36) is convexly provided at the top of the center positioning rod (3) and 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 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 blind hole (21). The knife handle (2) is provided with a vent hole (23) which penetrates the inner wall surface of the blind hole (21); when the top of the center positioning rod (3) is inserted into the blind hole (21), the air in the blind hole (21) is squeezed out through the vent hole (23); when the top of the center positioning rod (3) is pulled outward from the blind hole (21), the outside air enters the blind hole (21) through the vent hole (23).

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