CN108437090B

CN108437090B - Woodworking tapper

Info

Publication number: CN108437090B
Application number: CN201810229273.1A
Authority: CN
Inventors: 周忠友
Original assignee: Huzhou Vocational and Technical College
Current assignee: Huzhou Vocational and Technical College
Priority date: 2018-03-20
Filing date: 2018-03-20
Publication date: 2023-03-31
Anticipated expiration: 2038-03-20
Also published as: CN108437090A

Abstract

The invention discloses a woodworking tapper, which comprises a bracket, a drill bit assembly arranged at the bottom of the center of the bracket in the length direction, cutting assemblies symmetrically arranged at two sides of the drill bit assembly, and a clamping device fixedly connected with the cutting assemblies and connected to the bracket; the support comprises a push rod which is arranged at the top of the center of the support and is coaxial with the drill bit assembly, and support grooves which are symmetrically formed at two ends of the push rod and are used for connecting the clamping device; the drill bit assembly comprises a drill bit, and a drill sleeve which is sleeved on the drill bit and is used for mounting the drill bit to the bottom of the center of the support; the support also includes a mounting structure open at the bottom of the center of the support for receiving the drill bit assembly. The invention can rapidly and conveniently change the hole opening aperture in a step-by-step manner, ensure the stability and roundness of the cutting aperture, simultaneously rapidly, conveniently and stably replace the drill bit for pre-drilling, and adjust the stroke from pre-drilling to cutting operation according to the size of the specific drill bit, so that the hole opening quality is stable, the adjustment is convenient, and the adaptability is strong.

Description

Woodworking tapper

Technical Field

The invention relates to the field of wood board processing tools, in particular to a woodworking tapper.

Background

Modern house decoration is a complex project of a system, and needs to manufacture and install various wooden house decoration articles such as suspended ceiling installation, shoe cabinets, wardrobes, storage cabinets, tatami and the like, so that a large number of finished boards are needed, the boards usually need to be cut and processed to adapt to specific sizes and patterns of different houses, and holes are often needed to be formed in the boards for reserving installation positions of lamps in suspended ceilings or reserving interface installation positions of televisions in background walls or installation positions of sockets and the like. And current trompil instrument is often very simple, and the centre is the drill bit, uses the drill bit to have the cockscomb structure cutting piece as the periphery of center is densely covered, directly bores in the plank on electric tool, and not unidimensional round hole need use the trompil instrument of equidimension not, needs often whole switching, and the trompil effect is not good, and the incorruptibility is low.

Disclosure of Invention

The invention aims to provide a woodworking tapper, which can overcome the defects of the prior art, can quickly and conveniently change the tapping aperture in stages, ensures the stability and roundness of the cutting aperture, can quickly, conveniently and stably replace a drill bit for pre-drilling, and can adjust the stroke from pre-drilling to cutting operation according to the size of the specific drill bit, so that the tapping quality is stable, the adjustment is convenient, and the adaptability is strong.

The technical purpose of the invention is realized by the following technical scheme:

a woodworking tapper comprises a bracket, a drill bit assembly arranged at the bottom of the center of the bracket in the length direction, cutting assemblies symmetrically arranged at two sides of the drill bit assembly, and a clamping device fixedly connected with the cutting assemblies and connected to the bracket; the support comprises ejector rods which are arranged at the top of the center of the support and are coaxial with the drill bit assembly, and support grooves which are symmetrically formed at two ends of each ejector rod and are used for connecting the clamping device; the drill bit assembly comprises a drill bit and a drill sleeve which is sleeved on the drill bit and used for mounting the drill bit to the bottom of the center of the support; the support also includes a mounting structure open at the central bottom of the support to receive the drill bit assembly.

The ejector rod is arranged at the top of the center of the hole digger and is used for connecting electric or pneumatic drilling tools such as an electric hand drill, an air drill and the like; each part is properly installed, and before the wood board is perforated, the tip of the drill bit assembly is ensured to be lower than the tip of the cutting assembly. When the wood board cutting device is used, the ejector rod is directly inserted into a drill bushing of the drilling tool, the drilling tool provides rotary power of the hole opener, the drill bit assembly is aligned to the circle center of a hole required by a wood board, and the hole is pre-drilled into the wood board to a certain depth, so that a center reference of stable position required by the cutting assembly when the wood board is cut and a holding force required by the hole opener to be perpendicular to the wood board all the time in the cutting process are formed; the two cutting assemblies are symmetrically arranged on two sides of the drill bit assembly and fixed in a bracket groove which is symmetrical about the center of the bracket through a clamping device, so that the tip ends of the cutting assemblies keep the same distance with the center of a pre-drilled hole, and the cutting radiuses are ensured to be the same; the bracket grooves are arranged into a plurality of groups along the length direction of the bracket in a mirror mode, and when the clamping device is connected into different bracket grooves with the cutting assemblies, wood holes with different diameters can be cut out.

Preferably, the drill bushing comprises a chuck positioned at the bottom of the drill bushing, a jacket for wrapping and fixing the chuck, a positioning head positioned at the top of the drill bushing, and a connecting part for connecting the jacket and the positioning head; the upper part of the clamping sleeve is provided with a pair of opposite milling flat parts, and the transverse dimension of the connecting part is smaller than that of the clamping head and the clamping sleeve, so that a clamping groove is formed.

The collet can be a standard collet chuck to accommodate different sized bits, and the collet can be tightened or loosened to allow the collet chuck to be replaceable to accommodate more sized bits.

Preferably, the mounting structure comprises a mounting groove for accommodating the drill bushing, a positioning hole which is formed in the top of the mounting groove and used for accommodating the positioning head, a pair of horizontal limiting plates which are arranged in the mounting groove and matched with the milling flat part to limit the drill bushing in the horizontal direction, a pair of locking blocks which are transversely inserted into the clamping grooves and clamp the connecting part and vertically limit the drill bushing, and a clamping spring which provides clamping force for the locking blocks; and a spring mounting hole is formed in the mounting groove.

The horizontal limiting plate is fixedly connected to the bracket and can be integrally formed with the mounting groove, the positioning hole and the spring mounting hole in an injection molding mode in the manufacturing process of the bracket; the size of the positioning head is smaller than the distance between the milling flat parts, so that the positioning head can smoothly pass through the horizontal limiting plate, and the holding clamp spring provides a transverse holding clamp force, so that the locking block is firmly inserted into the clamping groove, and the drill bit assembly is prevented from vertically moving and rotating; simultaneously, the locating head inserts to the locating hole to the clamp cover also gets into between two horizontal limiting plates through milling the flat portion, prevents that drill bit assembly horizontal direction from removing and rotating, thereby with quick, firm the installing in the support of drill bit assembly. The support rotates along with the electric tool by taking the ejector rod as a shaft, the drill bit assembly rotates along with the support due to the cooperation of the horizontal limiting plate and the milling flat part, so that the power of the electric tool is transmitted to the drill bit, and pre-drilling is realized.

Preferably, a gap which is not smaller than the width of the clamping groove is formed between the top of the horizontal limiting plate and the top of the mounting groove, and the locking block is provided with a locking head adaptive to the width of the clamping groove and a locking body adaptive to the outer surface of the horizontal limiting plate; the lock head is provided with a clamping surface which is matched with the connecting part in shape, and the bottom of the clamping surface is provided with a guide part; the lower end of the lock body protrudes out of the lowest end of the horizontal limiting plate.

The lock block is clamped in a gap between the top of the horizontal limiting plate and the top of the mounting groove through the lock head, and the lock block freely moves in the gap between the top of the horizontal limiting plate and the top of the mounting groove without falling down by combining the supporting force provided by the holding and clamping spring, and the lock body is tightly attached to the outer surface of the horizontal limiting plate in a natural state; after the positioning head passes through the horizontal limiting plate, the guide part is contacted with the positioning head to guide the positioning head to push the lock block to be away from the horizontal limiting plate in a correct direction, the lock block continues to move upwards, the lock body returns to be attached to the horizontal limiting plate while the positioning head completely enters the positioning hole, and meanwhile, the lock head is inserted into the clamping groove to complete the installation of the drill bit assembly; on the other hand, because the lower end of the lock body protrudes out of the lowest end of the horizontal limiting plate, the lower end of the lock body can be manually pulled, so that the drill bit assembly is easily separated, and the whole cleaning or replacement is convenient.

Preferably, the bracket groove penetrates through the bracket width direction and is consistent with the shape and size of a cross section formed by each plane vertical to the bracket width direction, and the bracket groove comprises a horizontal groove and a vertical groove which are communicated with each other and cross the bracket width direction; the transverse groove is positioned at the lower part of the vertical groove and is provided with one or more clamping parts protruding out of the vertical groove in the length direction of the bracket; the clamping device comprises a sliding block capable of sliding in the transverse groove and a locking block used for locking or loosening the sliding block and capable of sliding in the wall of the vertical groove, the locking block abuts against a sliding block abutting column on the bottom surface of the transverse groove, a tension spring used for providing abutting force for the sliding block abutting column is provided, and the sliding block abutting column, the locking block, the sliding block and a sliding block support of the cutting assembly are vertically connected in sequence.

The support grooves are symmetrically arranged at two ends of the ejector rod, and the setting positions of the clamping parts are also symmetrical relative to the two ends of the ejector rod, so that the positions are stable and reliable when the clamping device is connected, the cutting assemblies on the clamping devices on two sides of the ejector rod can keep the same cutting radius when cutting is carried out, and the condition that the opening is a full circle is ensured.

The slider slides in the horizontal groove, with block portion butt or break away from promptly, makes clamping device can fix at the during operation, convenient removal when the support groove that connects need be changed.

Preferably, the sliding block support comprises a support body, a hollow part, a sleeving part and an installation part, wherein the transverse length of the hollow part is matched with the width of the support body, the vertical length of the hollow part is greater than the vertical length of the support body, the sleeving part is arranged at the top of the hollow part and is used for connecting the sliding block abutting column, and the installation part is arranged below the hollow part and is used for installing the cutting assembly.

The shape of the horizontal projection surface of the sliding block and the shape of the horizontal projection surface of the locking block are the same, the length of the sliding block and the length of the horizontal projection surface of the locking block are the same with the transverse length of the hollowed part, the sliding block and the locking block are restrained by the sliding block support in the length direction and are restrained by the transverse groove and the vertical groove in the width direction, the stability of the sliding block and the locking block and the tracing performance during movement are guaranteed, meanwhile, the sliding block support can freely translate in the vertical plane on the premise of limiting the width of the support, and the whole clamping device can move more accurately and conveniently.

Preferably, the sliding block abutting column comprises a top sleeve joint connected with the sleeving part, a bottom clamping joint connected with the sliding block, and a cylinder body connected with the top sleeve joint and the bottom clamping joint; the column body comprises an upper column body and a lower column body which are detachably connected, the upper column body is coaxially and fixedly connected with the top socket joint, and the lower column body is coaxially and fixedly connected with the bottom clamping joint; the tightening spring is sleeved on the column body.

Thereby conveniently realize the slider and support the post and be connected with slider support and slider, prop the upper end of the tension spring and meet with suit portion bottom surface, when the slider support reciprocated, suit portion bottom surface compression or house Dong prop the tension spring, realize propping the size of tight power and adjust.

The top sleeve joint is provided with a step, and the sleeve joint part is provided with a stepped hole forming a limit with the step; the length of the large-diameter hole of the stepped hole is greater than the vertical length of the bracket groove; the telescopic stroke of the tightening spring is greater than the length of the large-diameter hole of the stepped hole; the vertical length of the hollowed part is not less than the sum of the length of the large-diameter hole of the stepped hole and the vertical length of the bracket groove; when the clamping device is directly switched and connected among different bracket grooves, the top of the bracket body falls onto the locking block through the compression spring, a space larger than the bracket grooves is formed between the bottom of the sliding block and the hollowed part, and the sliding block and the locking block are integrally separated from the restraint of the bracket grooves in the vertical height under the condition of keeping the state, so that the integral switching of the clamping device among different bracket grooves is realized; and simultaneously, the tightening spring is ensured to have reliable tightening force all the time.

Preferably, the sliding block comprises a vertical hole which is matched with the bottom clamping joint and penetrates through the upper bottom surface and the lower bottom surface of the sliding block; the clamping hole is formed in the sliding block and is perpendicular to the vertical hole; the horizontal plane projection of the vertical hole is in the horizontal plane projection of the clamping hole.

The vertical hole is used for adapting to the bottom clamping joint, so that the lower column body is arranged on the sliding block, and the lower column body and the sliding block are convenient to connect and separate; the whole blind hole that is a square in joint hole all has the interval with between the bottom surface about the slider, and its horizontal direction's width and length all are greater than bottom joint head's size for bottom joint head can along erect the pore wall in hole and carry out the translation and simultaneously with the cylinder is rotatory as the axle, and as long as bottom joint head's position not just in time with erect the hole and overlap mutually, bottom joint head just can not fall out outside the slider.

Preferably, the locking block comprises a locking head arranged at one edge of the bottom of the locking block, an auxiliary locking head arranged at the other edge of the bottom of the locking block, a perforation vertically penetrating through the locking block, and a spring installation groove coaxially arranged with the perforation and formed on the top surface of the locking block; the lower end face of the auxiliary locking head is flush with the lower end face of the locking head.

The through hole is used for enabling the sliding block abutting column to penetrate through so as to be connected with the sliding block, the spring mounting groove is connected with the lower end of the tightening spring, a force application surface and circumferential restraint are provided for the tightening spring, and the tightening spring is stable in mounting and acting; the locking head is adaptive to the width of the clamping part, and when the sliding block completely slides into the clamping part, the locking head is inserted between the sliding block and the transverse groove wall to complete the limit of the sliding block in the length direction of the bracket; the lower terminal surface of vice locking head flushes with the lower terminal surface of locking head for the locking piece can keep flat on the slider top surface completely after breaking away from the slider completely, guarantees to take when slider and locking piece are vertical removal conveniently unimpeded together.

Preferably, the cutting assembly comprises a connecting plate positioned at the top, a connecting column fixedly connected to the bottom of the connecting plate, a cutting knife arranged in the connecting column, and a locking nut for fixing the cutting knife in the connecting column; the bottom of the cutting knife is provided with a conical cutting head; the cutting head is covered with carborundum; and the mounting part is provided with a mounting cavity matched with the connecting plate and the connecting column.

The connecting plate inserts to the installation cavity with the upper portion of spliced pole, the installation face of installation cavity can set up the apron and carry on spacingly, with cutting assembly stable installation on the clamping device, the spliced pole has the trompil that the opening is downward, including holding cutting knife upper portion, and the lower part surface of spliced pole is equipped with the screw thread, with the lock nut phase-match, thereby finish the cutting knife is fixed, the cutting head coats and is stamped one deck carborundum, thereby produce the cutting power when cutting assembly around the ejector pin rotation and during the operation in the plank, carry out the cutting operation.

In conclusion, the invention has the following beneficial effects:

the utility model provides a carpenter's hole digger, change through the mounted position of clamping device on the support carries out the hierarchical change in trompil aperture fast conveniently, the mounted position of clamping device is all the time about ejector pin central symmetry, guarantee the stability and the circularity in cutting aperture, simultaneously through the drill bit assembly and the mounting structure of unique structure, the drill bit that the change predrilling that can make things convenient for stably fast was used, and adapt to the concrete drill bit that uses through changing cutting assembly, the stroke of adjustment from predrilling to cutting operation, make the trompil steady quality, it is convenient to adjust, high adaptability.

Drawings

FIG. 1 is a schematic structural diagram of an embodiment of the present invention;

FIG. 2 is a schematic structural view of the top bar portion of the hole cutter;

FIG. 3 is a schematic view of a portion of the drill bit assembly;

FIG. 4 is a schematic view of the connection of the various parts of the clamping device to the carriage and cutting assembly;

FIG. 5 is a schematic view of a slider frame;

FIG. 6 is a schematic structural view of a slider prop;

FIG. 7 is a schematic structural view of a slider;

FIG. 8 is a schematic structural view of the latch block;

fig. 9 is a schematic structural view of the cutting assembly.

Detailed Description

The invention is described in further detail below with reference to the drawings and preferred embodiments.

The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.

Example (b): as shown in fig. 1-9, a carpentry tapper comprises a bracket 100, a drill bit assembly 200 disposed at the bottom of the center of the bracket in the length direction, cutting assemblies 300 symmetrically disposed at both sides of the drill bit assembly, and a clamping device 400 fixedly connected to the cutting assemblies and connected to the bracket; the support comprises a mandril 11 which is arranged at the top of the center of the support and is coaxial with the drill bit assembly, and support grooves 12 which are symmetrically formed at the two ends of the mandril and are used for connecting the clamping device; the drill bit assembly comprises a drill bit 21, a drill sleeve 22 which is sleeved on the drill bit and is used for mounting the drill bit to the bottom of the center of the support; the holder also includes a mounting structure 13 open at the bottom of the centre of the holder for receiving a drill bit assembly.

The drill bushing comprises a chuck 221 positioned at the bottom of the drill bushing, a jacket 222 for wrapping and fixing the chuck, a positioning head 223 positioned at the top of the drill bushing, and a connecting part 224 for connecting the jacket and the positioning head; the upper portion of the collet has a pair of opposed milled flats 2221, the connecting portion being smaller in transverse dimension than the collet and collet, thereby forming a catch 225.

The mounting structure comprises a mounting groove 131 for accommodating the drill bushing, a positioning hole 132 arranged at the top of the mounting groove and used for accommodating a positioning head, a pair of horizontal limiting plates 133 arranged in the mounting groove and matched with the milling flat part to limit the drill bushing in the horizontal direction, a pair of locking blocks 134 which are transversely inserted into the clamping connection part in the clamping groove and used for vertically limiting the drill bushing, and a clamping spring 135 for providing clamping force for the locking blocks; a spring mounting hole 1311 is formed in the mounting groove.

A gap which is not smaller than the width of the clamping groove is formed between the top of the horizontal limiting plate and the top of the mounting groove, and the locking piece is provided with a locking head 1341 which is adaptive to the width of the clamping groove and a locking body 1342 which is adaptive to the outer surface of the horizontal limiting plate; the lock head is provided with a clamping surface which is adaptive to the shape of the connecting part, and the bottom of the clamping surface is provided with a guide part; the lower end of the lock body protrudes out of the lowest end of the horizontal limiting plate.

The bracket grooves penetrate through the width direction of the bracket and keep consistent with the shape and size of the cross section formed by each plane vertical to the width direction of the bracket, and the bracket grooves comprise a transverse groove 121 and a vertical groove 122 which are communicated with each other and transversely penetrate through the width direction of the bracket; the transverse groove is positioned at the lower part of the vertical groove and is provided with one or more clamping parts 1221 protruding out of the vertical groove in the length direction of the bracket; the clamping device comprises a sliding block 41 capable of sliding in a transverse groove, a locking block 42 used for locking or loosening the sliding block and capable of sliding in a vertical groove wall, a sliding block abutting column 43 abutting against the locking block on the bottom surface of the transverse groove, a tension spring 44 providing abutting force for the sliding block abutting column, and a sliding block support 45 vertically and sequentially connecting the sliding block abutting column, the locking block, the sliding block and the cutting assembly. The slider support includes stake body 451, the horizontal length of opening in stake body middle part suits with the support width, vertical length is greater than the vertical length's of support excavation portion 452, locate the suit portion 453 that is used for connecting the slider and supports the post at excavation portion top, locate the installation department 454 that is used for installing the cutting assembly of excavation portion below.

The sliding block abutting column comprises a top sleeve joint 431 connected with the connecting sleeve part, a bottom clamping joint 432 connected with the sliding block and a column body 433 connected with the top sleeve joint and the bottom clamping joint; the column body comprises an upper column body and a lower column body which are detachably connected, the upper column body is coaxially and fixedly connected with the top sleeve joint, and the lower column body is coaxially and fixedly connected with the bottom clamping joint; the supporting spring is sleeved on the column body.

The slider comprises a vertical hole 411 which is matched with the bottom clamping joint and penetrates through the upper bottom surface and the lower bottom surface of the slider; a clamping hole 412 which is formed in the sliding block and is vertical to the vertical hole; the horizontal projection of the vertical hole is in the horizontal projection of the clamping hole.

The locking block comprises a locking head 421 arranged at one edge of the bottom of the locking block, an auxiliary locking head 422 arranged at the other edge of the bottom of the locking block, a perforation 423 vertically penetrating through the locking block, and a spring installation groove 424 coaxially arranged on the top surface of the locking block with the perforation; the lower end face of the auxiliary locking head is flush with the lower end face of the locking head.

The cutting assembly 300 comprises a connecting plate 31 positioned at the top, a connecting column 32 fixedly connected to the bottom of the connecting plate, a cutting knife 33 arranged in the connecting column, and a locking nut 34 for fixing the cutting knife in the connecting column; the bottom of the cutting knife is provided with a conical cutting head 331; the cutting head is covered with carborundum; the mounting part is provided with a mounting cavity 4541 which is matched with the connecting plate and the connecting column.

Claims

1. A carpenter's hole digger which characterized in that: the drilling tool comprises a bracket (100), a drill bit assembly (200) arranged at the bottom of the center of the bracket in the length direction, cutting assemblies (300) symmetrically arranged at two sides of the drill bit assembly, and a clamping device (400) fixedly connected with the cutting assemblies and connected to the bracket; the support comprises ejector rods (11) which are arranged at the top of the center of the support and are coaxial with the drill bit assembly, and support grooves (12) which are symmetrically formed in two ends of the ejector rods and are used for connecting the clamping device, wherein the support grooves are arranged in a plurality of groups along the length direction of the support in a mirror image manner; the drill bit assembly comprises a drill bit (21), a drill sleeve (22) sleeved on the drill bit and used for mounting the drill bit to the central bottom of the support; the support further comprises a mounting structure (13) open at the central bottom of the support for receiving the drill bit assembly; the bracket groove penetrates through the width direction of the bracket and is consistent with the shape and size of a cross section formed by each plane vertical to the width direction of the bracket, and the bracket groove comprises a transverse groove (121) and a vertical groove (122) which are communicated with each other and transversely penetrate through the width direction of the bracket; the transverse groove is positioned at the lower part of the vertical groove and is provided with one or more clamping parts (1221) protruding out of the vertical groove in the length direction of the bracket; the clamping device comprises a sliding block (41) capable of sliding in the transverse groove, a locking block (42) used for locking or loosening the sliding block and capable of sliding along the wall of the vertical groove, a sliding block abutting column (43) for abutting the locking block against the bottom surface of the transverse groove, a tension spring (44) for providing abutting force for the sliding block abutting column, and a sliding block support (45) vertically and sequentially connected with the sliding block abutting column, the locking block, the sliding block and the cutting assembly; the sliding block support comprises a support body (451), a hollow part (452) which is arranged in the middle of the support body, the transverse length of the hollow part is matched with the width of the support, the vertical length of the hollow part is greater than the vertical length of the support, a sleeving part (453) which is arranged at the top of the hollow part and used for connecting the sliding block support column, and an installation part (454) which is arranged below the hollow part and used for installing the cutting assembly; the sliding block abutting column comprises a top sleeve joint (431) connected with the sleeving part, a bottom clamping joint (432) connected with the sliding block and a cylinder (433) connected with the top sleeve joint and the bottom clamping joint; the column body comprises an upper column body and a lower column body which are detachably connected, the upper column body is coaxially and fixedly connected with the top socket joint, and the lower column body is coaxially and fixedly connected with the bottom clamping joint; the tightening spring is sleeved on the column body; the sliding block comprises a vertical hole (411) which is matched with the bottom clamping joint and penetrates through the upper bottom surface and the lower bottom surface of the sliding block; a clamping hole (412) which is arranged in the sliding block and is vertical to the vertical hole; the horizontal plane projection of the vertical hole is in the horizontal plane projection of the clamping hole; the locking block comprises a locking head (421) arranged on one edge of the bottom of the locking block, an auxiliary locking head (422) arranged on the other edge of the bottom of the locking block, a through hole (423) vertically penetrating through the locking block, and a spring installation groove (424) coaxially arranged with the through hole and arranged on the top surface of the locking block; the lower end face of the auxiliary locking head is flush with the lower end face of the locking head; the through hole is used for enabling the sliding block abutting column to penetrate through so as to be connected with the sliding block, and the spring mounting groove is connected with the lower end of the tensioning spring; the locking head is matched with the width of the clamping part, and when the sliding block completely slides into the clamping part, the locking head is inserted between the sliding block and the transverse groove wall to complete the limiting of the sliding block in the length direction of the bracket.

2. The woodworking hole opener of claim 1, wherein: the drill bushing comprises a chuck (221) positioned at the bottom of the drill bushing, a jacket (222) wrapping and fixing the chuck, a positioning head (223) positioned at the top of the drill bushing, and a connecting part (224) connecting the jacket and the positioning head; the upper portion of the collet has a pair of opposed milled flats (2221), the transverse dimension of the connecting portion being smaller than the collet and collet, thereby forming a bayonet slot (225).

3. The woodworking hole opener of claim 2, wherein: the mounting structure comprises a mounting groove (131) for accommodating the drill bushing, a positioning hole (132) which is formed in the top of the mounting groove and used for accommodating the positioning head, a pair of horizontal limiting plates (133) which are arranged in the mounting groove and matched with the milling flat part to limit the drill bushing in the horizontal direction, a pair of locking blocks (134) which are transversely inserted into the clamping grooves and used for clamping the connecting part and vertically limiting the drill bushing, and a clamping spring (135) for providing clamping force for the locking blocks; and a spring mounting hole (1311) is formed in the mounting groove.

4. A woodworking tapper as claimed in claim 3, wherein: a gap which is not smaller than the width of the clamping groove is formed between the top of the horizontal limiting plate and the top of the mounting groove, and the locking piece is provided with a locking head (1341) which is adaptive to the width of the clamping groove and a locking body (1342) which is adaptive to the outer surface of the horizontal limiting plate; the lock head is provided with a clamping surface which is matched with the connecting part in shape, and the bottom of the clamping surface is provided with a guide part; the lower end of the lock body protrudes out of the lowest end of the horizontal limiting plate.

5. The woodworking hole opener of claim 1, wherein: the cutting assembly (300) comprises a connecting plate (31) positioned at the top, a connecting column (32) fixedly connected to the bottom of the connecting plate, a cutting knife (33) arranged in the connecting column, and a locking nut (34) for fixing the cutting knife in the connecting column; the bottom of the cutting knife is provided with a conical cutting head (331); the cutting head is covered with carborundum; and the mounting part is provided with a mounting cavity (4541) which is matched with the connecting plate and the connecting column.