CN205466575U - Three -wing bit and carpenter's square hole drilling machine - Google Patents

Abstract

The utility model relates to a wood working machinery field provides carpenter's square hole drilling machine and three -wing bit, carpenter's square hole drilling machine includes: lathe bed, motor, drive unit and three -wing bit, drive unit sets up in the motor below and slides along vertical direction and sets up on the lathe bed, drive unit includes gearbox and the fixed drill bushing that sets up under the gearbox, the output shaft of motor stretches into the inside a plurality of gears and integral key shaft and camshaft of passing through of gearbox and meshes, and the camshaft is worn out the gearbox and is stretched into the drill bushing, square cover, the inside fixed well word drawing strickle guide that is used for injecing square set of moving direction that sets up of drill bushing are established to the inside cover of drill bushing, the camshaft bottom sets up the cam, and the cam stretches into square cover, lip river triangle -shaped piece is reined in to inside setting of square cover, the cam with rein in lip river triangle -shaped piece and pass through the cruciform joint and be connected, it wears out the drill bushing and couples with the three -wing bit to rein in the output shaft of lip river triangle -shaped piece. The utility model discloses can improve preparation square hole efficiency, reduce intensity of labour, improve the square hole machining precision.

Description

Three-wing bit and square auger of carpenter bed

Technical field

This utility model relates to woodworking machinery field, particularly relates to a kind of three-wing bit and square auger of carpenter bed.

Background technology

Wood boring machine is the wood craft machines processing through hole or blind hole with drill bit on workpiece.Wood boring machine is mainly used in timber boring, processing round tenon hole and repairs knot etc..Carpenter's mortise-tenon joint is furniture, builds indispensable connected mode, makes joinery products square hole at present and typically uses numerical controlled carving, Milling Process and get out periphery four hole again by modes such as chisel manual removal clouts with drill bit.

But, use numerical controlled carving, the mode of Milling Process to be difficult to remove periphery fillet, and processing cost be high；Getting out periphery four hole with drill bit and remove clout with chisel is manual again, labor intensity is big, and efficiency is low and crudy is uneven with precision.

Utility model content

This utility model mainly solves existing wood boring machine and makes square hole technical problem complicated, inefficient, proposes a kind of three-wing bit and square auger of carpenter bed, is greatly improved the efficiency making square hole, reduce labor intensity, improves the machining accuracy of square hole.

This utility model provides a kind of three-wing bit, and described three-wing bit includes: knife unit and the fixed cell (2) for fixed cutting tool unit；

Described knife unit includes that three cutter blocks (1), described three cutter blocks (1) are uniformly distributed at circumferencial direction, and described cutter block (1) is triangular prism shaped, and described three cutter blocks (1) have a rib to overlap；

The blade of described three cutter blocks (1) is distributed clockwise or counter-clockwise.

Further, the side outwardly of a cutter block in described three cutter blocks (1) is arcwall face.

Corresponding, this utility model also provides for a kind of square auger of carpenter bed, and described square auger of carpenter bed includes lathe bed (37), motor (22), gear unit and three-wing bit；

Described gear unit is arranged on motor (22) lower section and is vertically slidably arranged on lathe bed (37)；

Described gear unit includes change speed gear box (32) and the drill bushing (8) being fixedly installed under change speed gear box (32)；The output shaft of described motor (22) is stretched into change speed gear box (32) inside and is engaged with camshaft (11) by multiple gears and splined shaft, and camshaft (11) passes change speed gear box (32) and stretches into drill bushing (8)；The internal sheathed square sleeve (9) of drill bushing (8), drill bushing (8) is internal is fixedly installed well word drawing strickle guide (12) for limiting square sleeve (9) moving direction；

Camshaft (11) bottom arranges cam, and cam stretches into square sleeve (9)；Internal Le Lip river gore (6) that arranges of square sleeve (9), cam is connected by cruciform joint (10) with strangling Lip river gore (6)；The output shaft strangling Lip river gore (6) passes drill bushing (8) and couples with three-wing bit, and wherein, the offset of cam is equal to the height strangling Lip river gore (6) camber line；

In described three-wing bit, the blade face of three cutter blocks is corresponding to the line of central point with Le (6) three summits of gore, Lip river.

Further, described gear unit is vertically slidably arranged on lathe bed, including:

Arranging workbench (44) on described lathe bed (37), described lathe bed (37) is internal arranges line slideway (29)；Described line slideway (29) is slidably matched setting by slide block (28) and gear unit；

Being fixedly installed hydraulic cylinder (35) on described workbench (44), the top of hydraulic cylinder (35) is fixing with described slide block (28) to be connected.

Further, described line slideway (29) is fixed by guide rail seat board (30) with lathe bed (37).

Further, scale and the induction contact being equipped with scale are set on described lathe bed (37), described induction contact and magnetic force displacement sensor (42) data cube computation, described magnetic force displacement sensor (42) electrically connects with hydraulic cylinder (35).

Further, in the both sides of lathe bed (37) and be provided in the vertical direction on workbench (44) top and prop up the pneumatic cylinder (38) of processed product.

Further, described workbench (44) arranged location backup plate (41) and be used for propping up in the horizontal direction the pneumatic cylinder (38) of processed product.

Further, it is internal that described square auger of carpenter bed also includes that variable-speed unit, described variable-speed unit are arranged on change speed gear box (32), including:

First shift knob (15) engages with first stud gear (21), first stud gear (21) outer rim and speed change pulling block (16) engagement, speed change pulling block (16) groove engages with gear train (26) outer rim；

Second shift knob (17) engages with second stud gear (19), second stud gear (19) outer rim and speed change pulling block (16) engagement, speed change pulling block (16) groove engages with gear train (26) outer rim.

A kind of three-wing bit that this utility model provides and square auger of carpenter bed, simple in construction, reasonable in design, saving of labor, save time, efficiency high, compared with prior art, have the advantage that

Cooperating of this utility model motor, camshaft, square sleeve, well word drawing strickle guide and Le Lip river gore, the output shaft of motor drives cam axle by the first splined shaft, and then drive Le Lip river gore to rotate, couple with three-wing bit owing to strangling Lip river gore output shaft, three-wing bit can be made to get out square hole, well word drawing strickle guide is utilized to limit the direction of motion of square sleeve, can remove the fillet of square hole, the curve making drill bit blade both can do edge along square sleeve rotates to compensate with the vertical line entering also to have horizontal direction and moves.Therefore, this utility model can overcome the problem making square hole difficulty in prior art, improves the machining accuracy of square hole, and the square hole precision produced is high, improves the efficiency making square hole, and then can reduce difficulty of construction and labor intensity.

Accompanying drawing explanation

Fig. 1 is the structural representation of this utility model square auger of carpenter bed；

Fig. 2 is the top view of this utility model square auger of carpenter bed；

Fig. 3 a is the sectional view of line A-A along Fig. 2；

Fig. 3 b is portion's view of line B-B along Fig. 2；

Fig. 4 a-b is the schematic diagram of square hole working molding；

Fig. 5 is the product figure utilizing and strangling Lip river Triangle Principle processing；

Fig. 6 a-b is to remove square hole working to produce the schematic diagram of fillet；

Fig. 7 a-c is the schematic diagram of cutter block；

Fig. 8 a-b is the structural representation of three-wing bit；

Fig. 9 a-b is tool sharpening functional diagram.

The technical characteristic that in figure, reference refers to is:

1, cutter block；2, fixed cell；3, cutter hub seat；4, drill bushing cover plate；5, square sleeve cover plate；6, Lip river gore is strangled；7, square sleeve screw；8, drill bushing；9, square sleeve；10, cruciform joint；11, camshaft；12, well word drawing strickle guide；13, rolling bearing；14, drill bushing pedestal；15, the first shift knob；16, speed change pulling block；17, the second shift knob；18, the 3rd splined shaft；19, second stud gear；20, the 4th splined shaft；21, first stud gear；22, motor；23, the first gear；24, change speed gear box bearing (setting) plate；25, the second gear；26, gear train；27, change speed gear box seat board；28, slide block；29, line slideway；30, guide rail seat board；31, the second splined shaft；32, change speed gear box；33, fluid cylinder joint；34, drill bushing seat board；35, hydraulic cylinder；36, the first splined shaft；37, lathe bed；38, pneumatic cylinder；39, cylinder block；40, cylinder pressure head；41, location backup plate；42, magnetic force displacement sensor；43, processed product；44, workbench；45, square hole to be processed；46, major cutting edge；47, a secondary blade；48, secondary two blades.

Detailed description of the invention

For making this utility model solve the technical problem that, the technical scheme that uses and the technique effect reached clearer, the utility model is described in further detail with embodiment below in conjunction with the accompanying drawings.It is understood that specific embodiment described herein is used only for explaining this utility model, rather than to restriction of the present utility model.It also should be noted that, for the ease of describing, accompanying drawing illustrate only the part relevant to this utility model rather than full content.

Fig. 1 is the structural representation of this utility model square auger of carpenter bed.Fig. 2 is the top view of this utility model square auger of carpenter bed.Fig. 3 a is the sectional view of line A-A along Fig. 2.Fig. 3 b is portion's view of line B-B along Fig. 2.Referring to figs. 1 through 3, this utility model embodiment provides a kind of square auger of carpenter bed, including: lathe bed 37, motor 22, gear unit and three-wing bit.

Described gear unit is arranged on below motor 22 and is vertically slidably arranged on lathe bed 37；Described gear unit includes change speed gear box 32 and the drill bushing 8 being fixedly installed under change speed gear box 32；The output shaft of described motor 22 is stretched into change speed gear box 32 inside and is engaged with camshaft 11 by multiple gears and splined shaft, and camshaft 11 passes change speed gear box 32 and stretches into drill bushing 8；The internal sheathed square sleeve 9 of drill bushing 8, drill bushing 8 is internal is fixedly installed the well word drawing strickle guide 12 for limiting square sleeve 9 moving direction；Arranging cam bottom camshaft 11, cam stretches into square sleeve 9；Square sleeve 9 is internal arranges Le Lip river gore 6, and cam is connected by cruciform joint 10 with strangling Lip river gore 6；The output shaft strangling Lip river gore 6 passes drill bushing 8 and couples with three-wing bit, and wherein, the offset of cam is equal to the height strangling Lip river gore 6 camber line；In described three-wing bit, the blade face of three cutter blocks is corresponding to the line of central point with Le 6 three summits of gore, Lip river.

Concrete, the output shaft of described motor 22 stretches into internal also direct connection the second gear 25 of change speed gear box 32, second gear 25 engages with the first gear 23, first gear 23 is fixed on the 3rd splined shaft 18, described 3rd splined shaft 18 engages with the second splined shaft 31, described second splined shaft 31 is engaged with the first splined shaft 36 by gear train 26, and described first splined shaft 36 couples with camshaft 11 spline.Output moment of torsion can be passed to the first splined shaft 36 by gear train, the second splined shaft 31, and then be passed to camshaft 11 by the 3rd splined shaft 18.With reference to Fig. 4 a, strangle Lip river triangle be on the basis of equilateral triangle centered by vertex of a triangle with length of side L for radius by remaining 2 cambered surfaces connected, the triangle constituted with three cambered surfaces, the structure strangling Lip river gore 6 in this utility model uses Le Lip river triangle.

Wherein, motor 22 is arranged on change speed gear box bearing (setting) plate 24 top, and the output shaft of motor 22 passes through gear train 26 speed change, and motor 22 can be three motors.Change speed gear box 32 and drill bushing 8 may be provided in lathe bed 37, and motor 22 exposes lathe bed 37.Change speed gear box 32 and drill bushing 8 are fixed by drill bushing seat board 34.Strangle Lip river gore 6 to be coupled by output shaft and cutter hub seat 3 and three-wing bit.First splined shaft 36 couples camshaft 11 and drives three-wing bit to carry out square hole working by cruciform joint 10 transmission to strangling Lip river gore 6, camshaft 11 drives square sleeve 9 to move linearly under the restriction of well word drawing strickle guide 12 in rotation process, and square sleeve 9 upper end is provided with intersecting parallels groove and well word drawing strickle guide 12 is slidably matched and removes right angle portions material.Rolling bearing 13 is arranged on drill bushing pedestal 14, internally installed camshaft 11, it is possible to make camshaft 11 rotate along bearing center line.

Gear unit of the present utility model is vertically slidably arranged on lathe bed, including: arranging workbench 44 on described lathe bed 37, described lathe bed 37 is internal arranges line slideway 29；Described line slideway 29 is slidably matched setting by slide block 28 and gear unit；Being fixedly installed hydraulic cylinder 35 on described workbench 44, the top of hydraulic cylinder 35 is fixing with described slide block 28 to be connected.Wherein, described line slideway 29 is fixed by guide rail seat board 30 with lathe bed 37, and it is internal that guide rail seat board 30 is fixed on lathe bed 37.Lathe bed 37, workbench 44, guide rail seat board 30 use steel plate Numerical control cutting molding, and after each parts machining completes, assembly welding forms.Concrete, the slip of described gear unit is provided power, hydraulic cylinder 35 bottom to be fixed on workbench 44 by hydraulic cylinder 35, and top is connected on slide block 28 by the fluid cylinder joint 33 of hydraulic cylinder 35.Controlled by hydraulic system feeding, hydraulic cylinder 35 push rod connection sliding block 28, slide block 28 is connected with change speed gear box seat board 27 bolt, change speed gear box seat board 27 is fixed with change speed gear box 32, hydraulic cylinder 35 up and down reciprocatingly works, under the guiding of line slideway 29, it is achieved the straight reciprocating motion of three-wing bit, hydraulic system can realize stepless speed regulation during feeding.

Square auger of carpenter bed of the present utility model also includes variable-speed unit, the i.e. speed regulating structure of change speed gear box 32, it is internal that described variable-speed unit is arranged on change speed gear box 32, including: the first shift knob 15 engages with first stud gear 21, first stud gear 21 outer rim and speed change pulling block 16 engagement, speed change pulling block 16 groove engages with gear train 26 outer rim；Second shift knob 17 engages with second stud gear 19, and second stud gear 19 outer rim and speed change pulling block 16 engagement, speed change pulling block 16 groove engages with gear train 26 outer rim.Speed control principle: the speed change changing gear by the internal three set duplex-gear slips on first splined shaft the 36, second splined shaft the 31, the 3rd splined shaft 18 of gear train 26 becomes ratio to realize different rotating speeds.Therefore, square auger of carpenter bed of the present utility model can regulate process velocity.Speed change pulling block 16 is arranged on the 4th splined shaft 20 can do under the effect that shift knob rotates does not has spline line to do straight reciprocating motion.Change speed gear box bearing (setting) plate 24 is bolted each splined shaft axle head effect in playing static housing on change speed gear box 32.Sliding impeller is arranged on the first gear 23 bottom, is splashed on each splined shaft and gear play lubrication along with lubricating oil in change speed gear box can be taken up by the transhipment of motor 22.

Arranging scale and the induction contact being equipped with scale, described induction contact and magnetic force displacement sensor 42 data cube computation on this utility model lathe bed 37, described magnetic force displacement sensor 42 electrically connects with hydraulic cylinder 35.The square hole degree of depth of processed product preprocessing is regulated by scale, the square hole degree of depth arranged by the induction contact sensing being equipped with scale, and controlled the up and down reciprocatingly degree of hydraulic cylinder 35 by magnetic force displacement sensor 42, and then realize the control of the other side's hole depth.

Additionally, this utility model also sets up two groups (four) for fixing the pneumatic cylinder 38 of processed product 43, in the both sides of lathe bed 37 and be provided in the vertical direction on workbench 44 top and prop up two pneumatic cylinders 38 of processed product, described workbench 44 arranges location backup plate 41 and for propping up two pneumatic cylinders 38 of processed product in the horizontal direction.Pneumatic cylinder 38 is fixed with lathe bed 37 by cylinder block 39, and pneumatic cylinder 38 arranges cylinder pressure head 40 near one end of processed product 43.The pneumatic cylinder 38 of two vertical direction settings can be pressed below, processed product 43 in the vertical direction being placed on workbench 44 is made to fix, the pneumatic cylinder 38 arranged in two horizontal directions is arranged on workbench 44, coordinates with location backup plate 41, makes processed product 43 fix in the horizontal direction.

Cutting tip of the present utility model mainly includes that three-wing bit, described three-wing bit include: knife unit and the fixed cell 2 for fixed cutting tool unit；Described knife unit includes that three cutter blocks 1, described three cutter blocks 1 are uniformly distributed at circumferencial direction, and described cutter block 1 is triangular prism shaped, and described three cutter blocks 1 have a rib to overlap；The blade of described three cutter blocks 1 is distributed clockwise or counter-clockwise.One cutter block of described three cutter blocks 1 side outwardly is arcwall face.In three sword Square aiguilles, the blade face of three cutter blocks 1 is corresponding to the line of central point with Le Atria summit, Lip river.Cutting tip is arranged on the bottom of change speed gear box 32, uses three pieces of 3-edge surgical knife tools, and cutter block 1 hot charging enters in fixed cell 2, and three-wing bit is connected with cutter hub seat 3 bolt.Three cutter blocks 1 are divided into operator block, a secondary cutter block and secondary two cutter blocks, and described operator block, a described cutter block and secondary two cutter blocks are the most triangular prism shaped, and described operator block side outwardly is arcwall face.In order to coordinate, above-mentioned processing is dynamic to be done, and have employed three piece of three edge drilling bit, and the function of each cutter block has difference.

With reference to Fig. 4 to 9, this utility model can get out the principle of square hole: square auger of carpenter bed, use and strangle Lip river gore 6 in the rotation of square sleeve 9 internal circumference, strangle Lip river gore 6 cuspidal locus and become square, the blade of three cutter blocks of three-wing bit overlaps at vertical direction with strangling Atria summit, Lip river, square hole (such as Fig. 4) can be processed, Fig. 4 a rotates original state schematic diagram for strangling Lip river triangle, Fig. 4 b is to strangle Lip river triangle to rotate clockwise the schematic diagram after 45 degree, be can be seen that by Fig. 4 a and 4b strangling Lip river triangle rotates the cutting movement track of three blades under square sleeve 9 inner chamber restraint condition.But, it is that straight line junction (foursquare four angles) can produce fillet (such as Fig. 5) at the product deficiency that above-mentioned principle processes.In order to remove fillet part, a set of camshaft 11 is dosed at the axial input strangling Lip river gore 6, the offset utilizing camshaft 11 cam coordinates well word drawing strickle guide 12 to make Le Lip river gore 6 and the skew of square sleeve 9 straight line, and the offset of cam is equal to the height strangling Lip river triangle camber line.Strangle Lip river gore 6 to rotate, and it is arranged on square sleeve 9 inside owing to strangling Lip river gore 6, square sleeve 9 moves again under the restriction of well word drawing strickle guide 12, square sleeve 9 can move along two " erecting " of " well " word of well word drawing strickle guide 12, can move along two " horizontal " of well word drawing strickle guide 12 again.When certain distance before the major cutting edge 46 strangling Lip river gore 6 drive rotates to fillet, the eccentric throw that cam rotates makes square sleeve 9 move at foursquare cusp in advance along well word drawing strickle guide 12 straight line, and then processing is produced compensating property of fillet removing (such as Fig. 6), Fig. 6 a is cam, square sleeve 9, strangle Lip river gore 6 overlaps with blade the view one of motion principle, as shown in Figure 6 a, cam rotates along centrage, and square sleeve 9 overlaps with square hole 45 to be processed；Fig. 6 b is cam, square sleeve 9, strangle Lip river gore 6 overlaps with blade the view two of motion principle, as shown in Figure 6 b, cam rotates camming rim along axis and promotes square sleeve 9 inwall to make square sleeve do single direction linear motion, and Le Lip river gore 6 loads square sleeve its three the summits internal line with center and overlaps with blade and rotate.Can be seen that with cam be motionless centrage by Fig. 6 a and b, square sleeve 9, Le Lip river gore 6, the track of blade motion.Fig. 7 a is the front view of cutter block, and Fig. 7 b is the left view of cutter block, and Fig. 7 c is the top view of cutter block, and Fig. 8 a is the front view of three-wing bit, and Fig. 8 b is the top view of three-wing bit.With reference to Fig. 7, 8 and 9, three-wing bit is inlayed spelling by three cutter blocks 1 and is formed, each cutter block 1 has three cutting edge (major cutting edges 46, a secondary blade 47, secondary two blades 48), drill bit is processed when having nine blade differences cutting the heat seal of (such as Fig. 7) three cutter blocks 1 and (such as Fig. 8) in cutter hub, three cutter blocks 1 have respective function, operator block carries out clearing up straightway and cutting right angle function, a secondary cutter block is substantially carried out 1/2 processing before fillet cutting and square hole straightway, secondary two cutter blocks are substantially carried out after bottom surface and square hole straight line portion at 1/2 processing (such as Fig. 9), cutter uses hydraulic feed mode, can in running implementation phase speed change.This utility model be mainly adapted to timber square hole can work, add and want that efficiency is high, accuracy is accurate, convenient to operation.

nullReferring to figs. 1 through 3，The operation principle of this utility model square auger of carpenter bed: by processed product 43 work platform for placing 44，By four pneumatic cylinders 38 and location backup plate 41, processed product 43 is fixed on workbench 44，General-purpose machine 22 drives，The output shaft of motor 22 withholds camshaft 11 by multiple splined shafts and gear transmission turn，Camshaft 11 rotates，The cam of camshaft 11 is placed in square sleeve 9 inside and closely cooperates in square sleeve 9 endoporus，The eccentric cam rotation dynamic square sleeve 9 of radially torr does under the restriction of well word drawing strickle guide 12 and is parallel to processed product or is perpendicular to the motion of processed product，Square sleeve 9 utilizes well word drawing strickle guide 12 to couple with drill bushing pedestal 14，Make square sleeve 9 can only carry out the dynamic fortune of linear reciprocation of two vertical direction between drill bushing pedestal 14 and drill bushing cover plate 4 along well word drawing strickle guide 12，Camshaft 11 output end is opened straight trough and is coupled by cruciform joint 10 is relative with strangling Lip river gore 6，Square sleeve 9 does swing rotary along lathe bed 37 main shaft between drill bushing pedestal 14 and square sleeve cover plate 5，Strangle Lip river gore 6 to couple with cutter hub seat 3，Three-wing bit is fixed on cutter hub seat 3，Make the centrage keeping parallelism of bit centrage and camshaft 11，Do the revolution of radius unequal，And drill bit self does constant speed rotation around center line of bit.Square sleeve cover plate 5 is fixed on square sleeve 9 by square sleeve screw 7.Each blade both can do and rotate the same level carrying out and being perpendicular in major axes orientation plane along machine tool chief axis directivity curve, vertical straight line compensates motion, processed product 43 processes without fillet square hole, the length feed of three-wing bit is to guide with line slideway 29, line slideway 29 is fixed on the guide rail seat board 30 of lathe bed 37, the fixing other end on the table in hydraulic cylinder 35 one end is connected on change speed gear box seat board 27 by fluid cylinder joint 33, fluid cylinder work drags whole speed change and bit system motion, realize drill bit to pump, realize drill bit feeding, hydraulic cylinder 35 is provided with magnetic force displacement sensor 42, lathe bed 37 is provided with induction contact, contact is slidably matched in scale, lock after adjusting by scale, regulate the degree of depth in processing hole.

The square auger of carpenter bed that this utility model embodiment provides, by motor 22, camshaft 11, square sleeve 9, well word drawing strickle guide 12 and strangle cooperating of Lip river gore 6, the output shaft of motor 22 drives camshaft 11 to rotate by the first splined shaft, and then drive Le Lip river gore 6 to rotate, couple with three-wing bit owing to strangling Lip river gore 6 output shaft, three-wing bit can be made to get out square hole, well word drawing strickle guide 12 is utilized to limit the direction of motion of square sleeve 9, the fillet of square hole can be removed, the curve making drill bit blade both can do edge along square sleeve 9 rotates to compensate with the vertical line entering also to have horizontal direction and moves.Therefore, this utility model can overcome the problem making square hole difficulty in prior art, improves the machining accuracy of square hole, and the square hole precision produced is high, improves the efficiency making square hole, and then can lower difficulty of construction and labor intensity.

Last it is noted that various embodiments above is only in order to illustrate the technical solution of the utility model, it is not intended to limit；Although this utility model being described in detail with reference to foregoing embodiments, it will be understood by those within the art that: the technical scheme described in foregoing embodiments is modified by it, or the most some or all of technical characteristic is carried out equivalent, does not make the essence of appropriate technical solution depart from the scope of this utility model each embodiment technical scheme.

Claims (9)

1. a three-wing bit, it is characterised in that described three-wing bit includes: knife unit and for solid Determine the fixed cell (2) of knife unit；

Described knife unit includes three cutter blocks (1), and described three cutter blocks (1) are uniform at circumferencial direction Distribution, described cutter block (1) is triangular prism shaped, and described three cutter blocks (1) have a rib to overlap；

The blade of described three cutter blocks (1) is distributed clockwise or counter-clockwise.

Three-wing bit the most according to claim 1, it is characterised in that in described three cutter blocks (1) Cutter block side outwardly be arcwall face.

3. a square auger of carpenter bed, it is characterised in that described square auger of carpenter bed include lathe bed (37), Motor (22), gear unit and the three-wing bit described in claim 1 or 2；

Described gear unit is arranged on motor (22) lower section and is vertically slidably arranged in lathe bed (37) On；

Described gear unit includes change speed gear box (32) and the drill bushing (8) being fixedly installed under change speed gear box (32)； The output shaft of described motor (22) stretches into change speed gear box (32) inside and passes through multiple gears and splined shaft with convex Wheel shaft (11) engages, and camshaft (11) passes change speed gear box (32) and stretches into drill bushing (8)；Drill bushing (8) Internal sheathed square sleeve (9), drill bushing (8) is internal to be fixedly installed for limiting square sleeve (9) moving direction Well word drawing strickle guide (12)；

Camshaft (11) bottom arranges cam, and cam stretches into square sleeve (9)；Square sleeve (9) is internal to be set Putting Le Lip river gore (6), cam is connected by cruciform joint (10) with strangling Lip river gore (6)； The output shaft strangling Lip river gore (6) passes drill bushing (8) and couples with three-wing bit, wherein, and cam Offset is equal to the height strangling Lip river gore (6) camber line；

In described three-wing bit, the blade face of three cutter blocks and Le (6) three summits of gore, Lip river are to center The line of point is corresponding.

Square auger of carpenter bed the most according to claim 3, it is characterised in that described gear unit is along perpendicular Nogata to being slidably arranged on lathe bed, including:

Arranging workbench (44) on described lathe bed (37), described lathe bed (37) is internal arranges line slideway (29)；Described line slideway (29) is slidably matched setting by slide block (28) and gear unit；

Being fixedly installed hydraulic cylinder (35) on described workbench (44), the top of hydraulic cylinder (35) is with described Slide block (28) is fixing to be connected.

Square auger of carpenter bed the most according to claim 4, it is characterised in that described line slideway (29) It is fixed by guide rail seat board (30) with lathe bed (37).

Square auger of carpenter bed the most according to claim 4, it is characterised in that on described lathe bed (37) Scale and the induction contact being equipped with scale, described induction contact and magnetic force displacement sensor are set (42) data cube computation, described magnetic force displacement sensor (42) electrically connects with hydraulic cylinder (35).

Square auger of carpenter bed the most according to claim 4, it is characterised in that at the two of lathe bed (37) Side and be provided in the vertical direction on workbench (44) top and prop up the pneumatic cylinder (38) of processed product.

8. according to the square auger of carpenter bed described in claim 4 or 7, it is characterised in that described workbench (44) On location backup plate (41) is set and for propping up the pneumatic cylinder (38) of processed product in the horizontal direction.

9. according to the square auger of carpenter bed described in claim 3, it is characterised in that described square auger of carpenter bed is also Including variable-speed unit, it is internal that described variable-speed unit is arranged on change speed gear box (32), including:

First shift knob (15) engages with first stud gear (21), and first stud gear (21) is outward Edge and speed change pulling block (16) engagement, speed change pulling block (16) groove engages with gear train (26) outer rim；

Second shift knob (17) engages with second stud gear (19), and second stud gear (19) is outward Edge and speed change pulling block (16) engagement, speed change pulling block (16) groove engages with gear train (26) outer rim.