CN111774626A - Special machine tool for machining T-shaped groove of large-scale workbench of numerical control milling machine or vertical lathe - Google Patents

Abstract

A special machine tool for processing numerical control milling lathe or merry go round machine large-scale workstation T type groove belongs to lathe technical field to solve current milling lathe or merry go round machine workstation and adopt the longmen to mill processing, there is machining efficiency lower, and the processing position precision is not high, because the longer manufacturing cost's that has increased the singleton problem of man-hour. The milling machine comprises a frame body, a base, a processing platform, a left milling head, a right milling head, a lifting device and a cross beam; the crossbeam passes through elevating gear and sets up and can reciprocate on the support body, base and support body fixed connection, the processing platform rotates to set up on the base and through motor drive, left side cutter head and right cutter head all slide through the guide rail and set up on the crossbeam, all be fixed with a screw on left side cutter head and the right cutter head, it is provided with two lead screws to rotate on the crossbeam, every lead screw passes through gear motor drive and enables left cutter head and right cutter head along guide rail lateral shifting on the crossbeam, every screw and every lead screw thread fit. The invention is suitable for processing milling machine or vertical lathe workbench.

Description

Special machine tool for machining T-shaped groove of large-scale workbench of numerical control milling machine or vertical lathe

Technical Field

The invention relates to a special machine tool for machining a T-shaped groove of a milling lathe or a vertical lathe workbench, and belongs to the technical field of machine tools.

Background

As shown in fig. 1, in the existing milling machine or vertical lathe workbench, a plurality of T-shaped grooves are processed on the upper surface of the workbench, and usually a planer type milling machine is required for processing, because the diameter of the workbench is large, the conventional index plate cannot be used for indexing, multiple times of transposition, clamping and angle adjustment are required, and then milling is performed, the processing efficiency is low, the processing position precision is not high, and the manufacturing cost of single pieces is increased due to long working hours.

Disclosure of Invention

The invention provides a special machine tool for machining a T-shaped groove of a large-scale workbench of a numerical control milling machine or a vertical lathe, aiming at solving the problems that the existing milling machine or vertical lathe workbench is machined by a gantry mill, the machining efficiency is low, the machining position precision is not high, and the manufacturing cost of a single piece is increased due to long working hours.

The technical scheme adopted by the invention for solving the technical problems is as follows:

the special machine tool for machining the T-shaped groove of the large-scale workbench of the numerical control milling lathe or the vertical lathe comprises a frame body, a base, a machining platform, a left milling head, a right milling head, a lifting device and a cross beam; the crossbeam passes through elevating gear and sets up and can reciprocate on the support body, base and support body fixed connection, the processing platform rotates to set up on the base and through motor drive, left side cutter head and right cutter head all slide through the guide rail and set up on the crossbeam, all be fixed with a screw on left side cutter head and the right cutter head, it is provided with two lead screws to rotate on the crossbeam, every lead screw passes through gear motor drive and enables left cutter head and right cutter head along guide rail lateral shifting on the crossbeam, every screw and every lead screw thread fit.

Preferably, the left milling head and the right milling head have the same structure, and the left milling head comprises a spindle box, a speed regulation driving mechanism, three spindles and three spindle sleeves;

the main shaft box is provided with three main shaft sleeves which are arranged in parallel, each main shaft sleeve is rotationally provided with a main shaft, each main shaft is provided with a gear, each gear is connected with each main shaft through a key, the gear on one main shaft is meshed with the gears on the other two main shafts, and the gear on one main shaft in the three main shafts is driven through a speed regulation driving mechanism;

and a nut is fixed on each spindle box of the left milling head and the right milling head.

Preferably, the speed regulation driving mechanism comprises a motor, an IV shaft, an IVa shaft, a V shaft, a VI shaft and two shifting forks;

the IV shaft, the IVa shaft, the V shaft and the VI shaft are all rotationally arranged on the spindle box, the VI shaft is driven by a motor, a gear a is fixedly arranged on the VI shaft, a gear b, a gear c, a gear d and a gear e are fixedly arranged on the IV shaft, the gear a is meshed with the gear b, a gear f, a gear g and a gear k are fixedly arranged on the IVa shaft, a gear on one of the three main shafts is meshed with the gear f, a duplicate gear and a triple gear are arranged on the V shaft in a sliding mode, and the duplicate gear and the triple gear can slide on the V shaft through a shifting fork respectively;

when the shifting fork shifts the duplicate gear, the g gear and the k gear can be meshed with the duplicate gear respectively;

when the shifting fork shifts the triple gear, the gear c, the gear d and the gear e are meshed with the triple gear respectively.

Preferably, the duplicate gear is an integral structure formed by machining an H1 gear and an H2 gear, the H1 gear and the g gear can be meshed with each other, and the H2 gear and the k gear can be meshed with each other.

Preferably, the triple gear is an integral structure formed by a T1 gear, a T2 gear and a gear, wherein the T1 gear can be meshed with the c gear, the T2 gear can be meshed with the d gear, and the T3 gear can be meshed with the e gear.

Preferably, the special machine tool for machining the T-shaped groove of the large-scale workbench of the numerical control milling machine or the vertical lathe further comprises three sets of axial feeding adjusting mechanisms, each set of axial feeding adjusting mechanism comprises a worm wheel, a worm and a mounting seat, the worm wheel and the worm are rotatably arranged on the mounting seat and are meshed with each other, and the mounting seat on each set of axial feeding adjusting mechanism is fixed on the spindle box;

each spindle sleeve is arranged on the spindle box in a sliding mode through keys, a plurality of wheel grooves with equal intervals are formed in the outer surface of each spindle sleeve, a worm wheel on each set of axial feeding adjusting mechanism is matched with the wheel grooves in each spindle sleeve, and when the worm is rotated, the spindle sleeves can move in the axial direction of the spindles along the worm.

Preferably, the special machine tool for machining the T-shaped groove of the large-scale workbench of the numerical control milling machine or the vertical lathe further comprises three sets of locking mechanisms, wherein each set of locking mechanism comprises a screw, a bushing, a first internal thread sleeve and a second internal thread sleeve; the spindle box is provided with three parallel unthreaded holes and three parallel spindle sleeve holes, each spindle sleeve is arranged in each spindle sleeve hole in a sliding mode through a key, each unthreaded hole is perpendicular to each spindle sleeve hole and communicated with each other, a lining is fixed in each unthreaded hole, a first internal thread sleeve and a second internal thread sleeve are arranged in each unthreaded hole in a sliding mode, a screw penetrates through the lining and is in clearance fit with the lining, the first internal thread sleeve and the second internal thread sleeve are in threaded fit with the screw respectively, the internal threads of the first internal thread sleeve and the second internal thread sleeve are opposite in rotating direction, and arc surfaces matched with the outer surface of the spindle sleeve are machined on the first internal thread sleeve and the second internal thread sleeve.

Preferably, the lifting device comprises a lifting motor, two speed reducers, two lifting screw rods, two nuts a and two groups of lifting guide rails; lifting motor, two reduction gears and two sets of lifting guide all fix on the support body, all slide on every guide rail in two sets of lifting guide and be provided with the slider, every slider and every screw a respectively with crossbeam fixed connection, two elevating screw rotate and set up on the support body, lifting motor passes through the input fixed connection of axle and two reduction gears, the output and every elevating screw fixed connection of every reduction gear, every elevating screw and every screw a screw-thread fit are connected, two reduction gears of elevating motor drive make the crossbeam can reciprocate along two sets of lifting guide.

Compared with the prior art, the invention has the following beneficial effects:

according to the invention, the vertical lathe or the milling lathe workbench is clamped on the processing platform, the transposition milling of the workbench is realized by adjusting the rotation angle of the processing platform, and the problem of low processing position precision caused by repeated clamping of the existing workbench adopting a gantry milling machine is solved. Meanwhile, the left milling head and the right milling head are arranged, and the workbench is milled in two directions by adopting the double milling heads, so that the machining efficiency is greatly improved, the machining working time is shortened, and the manufacturing cost of a single piece is reduced.

Drawings

FIG. 1 is a schematic view of a vertical lathe or milling machine table;

FIG. 2 is a front view of the present invention;

FIG. 3 is a left side view of the present invention;

FIG. 4 is a top view of the present invention;

FIG. 5 is a schematic view of the left and right milling heads respectively connected to the cross beam;

FIG. 6 is a schematic view of the left milling head;

FIG. 7 is a sectional view A-A of FIG. 6;

FIG. 8 is a cross-sectional view B-B of FIG. 6;

FIG. 9 is a cross-sectional view C-C of FIG. 6;

FIG. 10 is an expanded view of the interior plane of the left milling head;

FIG. 11 is a cross-sectional view D-D of FIG. 8;

FIG. 12 is a front view of mount 7-3;

FIG. 13 is a cross-sectional view E-E of FIG. 12;

fig. 14 is a front view of the spindle sleeve 4;

fig. 15 is a partial enlarged view at I of fig. 14.

Detailed Description

The invention will be described in further detail below with reference to the accompanying drawings: the present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation is given, but the scope of the present invention is not limited to the following embodiments.

Example 1: as shown in fig. 2 to 5, the present embodiment relates to a special machine tool for machining a T-shaped groove of a large-scale workbench of a numerical control milling machine or a vertical lathe, which includes a frame body a1, a base a2, a machining platform A3, a left milling head a4, a right milling head a5, a lifting device a6, and a cross beam a 7; crossbeam A7 can reciprocate on support A1 through elevating gear A6 setting, base A2 and support A1 fixed connection, processing platform A3 rotates and sets up on base A2 and through motor drive, the motor can be servo motor, left cutter head A4 and right cutter head A5 all slide through the guide rail and set up on crossbeam A7, all be fixed with a nut A9 on left cutter head A4 and the right cutter head A5, it is provided with two lead screws A8 to rotate on crossbeam A7, every lead screw passes through gear motor drive energy and makes left cutter head A4 and right cutter head A5 move along the guide rail lateral direction on the crossbeam, every nut A9 and every lead screw A8 screw-thread fit.

Specifically, the left milling head a4 and the right milling head a5 have the same structure, and as shown in fig. 5-7, the left milling head a4 includes a main spindle box 1, a speed regulation driving mechanism 2, three spindles 3 and three spindle sleeves 4;

three spindle sleeves 4 which are arranged in parallel are arranged on the spindle box 1, a spindle 3 is rotationally arranged in each spindle sleeve 4, a gear 6 is arranged on each spindle 3, each gear 6 is in key connection with each spindle 3, the gear 6 on one spindle 3 is meshed with the gears 6 on the other two spindles 3, and the gear 6 on one spindle of the three spindles 3 is driven by the speed-regulating driving mechanism 2;

and a nut A9 is fixed on each spindle box 1 of the left milling head A4 and the right milling head A5.

Specifically, as shown in fig. 6, 7 and 10, the speed-adjusting driving mechanism 2 comprises a motor 2-1, an IV shaft 2-2, an IVa shaft 2-3, a V shaft 2-4, a VI shaft 2-5 and two forks 2-7;

an IV shaft 2-2, an IVa shaft 2-3, a V shaft 2-4 and a VI shaft 2-5 are all rotationally arranged on the spindle box 1, the VI shaft 2-5 is driven by a motor 2-1, an a gear 2-8 is fixedly arranged on the VI shaft 2-5, a b gear 2-9, a c gear 2-10, a d gear 2-11 and an e gear 2-12 are fixedly arranged on the IV shaft 2-2, the a gear 2-8 is mutually meshed with the b gear 2-9, an f gear 2-13, a g gear 2-14 and a k gear 2-15 are fixedly arranged on the IVa shaft 2-3, a gear 6 on one main shaft 3 of the three main shafts 3 is mutually meshed with the f gear 2-13, a double gear 2-16 and a triple gear 2-17 are slidably arranged on the V shaft 2-4, the duplicate gears 2-16 and the triple gears 2-17 can slide on the V shafts 2-4 through a shifting fork 2-7 respectively;

when the shifting forks 2 to 7 shift the duplicate gears 2 to 16, the g gears 2 to 14 and the k gears 2 to 15 can be meshed with the duplicate gears 2 to 16 respectively;

when the shifting forks 2 to 7 shift the triple gears 2 to 17, the gears 2 to 10 c, the gears 2 to 11 d and the gears 2 to 12 e can be meshed with the triple gears 2 to 17 respectively.

The distance between two main shafts 3 in the three main shafts is the same as the distance between two parallel T-shaped grooves on the vertical lathe or the milling lathe workbench, and the other main shaft 3 is positioned on the perpendicular bisector of the central connecting line of the two main shafts 3, so that the T-shaped grooves on the vertical lathe or the milling lathe workbench can correspond to the two parallel T-shaped grooves or the T-shaped grooves with the central lines passing through the center of the workbench.

Specifically, as shown in fig. 10, the dual gears 2 to 16 are an integral structure formed by machining an H1 gear and an H2 gear, the H1 gear and the g gears 2 to 14 can be meshed with each other, and the H2 gear and the k gears 2 to 15 can be meshed with each other.

Specifically, as shown in fig. 10, the triple gears 2-17 are an integral structure formed by a T1 gear, a T2 gear and a T3 gear, wherein the T1 gear and the c gear 2-10 can be meshed with each other, the T2 gear and the d gear 2-11 can be meshed with each other, and the T3 gear and the e gear 2-12 can be meshed with each other. The T1 gear can be provided with a shaft shoulder, the T2 gear and the T3 gear are sleeved on the T1 gear, and the T2 gear and the T3 gear are connected with the T1 gear through keys.

Specifically, as shown in fig. 8, 11, 12, 13, 14 and 15, the present embodiment is used for a special machine tool for machining a T-shaped groove of a large-sized workbench of a numerical control milling machine or a vertical lathe, and further includes three sets of axial feed adjusting mechanisms 7, each set of axial feed adjusting mechanism 7 includes a worm wheel 7-1, a worm 7-2 and a mounting seat 7-3, the worm wheel 7-1 and the worm 7-2 are both rotatably arranged on the mounting seat 7-3, the worm wheel 7-1 and the worm 7-2 are engaged with each other, and the mounting seat 7-3 on each set of axial feed adjusting mechanism 7 is fixed on a spindle box 1;

each spindle sleeve 4 is arranged on the spindle box 1 in a sliding mode through keys, a plurality of wheel grooves 4-1 with equal intervals are machined in the outer surface of each spindle sleeve 4, a worm wheel 7-1 on each set of axial feed adjusting mechanism 7 is matched with the wheel groove 4-1 on each spindle sleeve 4, and when the worm 7-2 is rotated, the spindle sleeves 4 can move axially along the spindle sleeves.

The worm 7-2 is rotated to drive the worm wheel 7-1 to rotate, and the worm wheel 7-1 rotates to enable the spindle sleeve 4 to move along the axial direction, so that feeding of each spindle 3 is realized, and adjustment is facilitated when T-shaped grooves at different positions are machined.

Specifically, the present embodiment is used for a special machine tool for machining a T-shaped groove of a large-sized workbench of a numerical control milling machine or a vertical lathe, and further includes three sets of locking mechanisms, as shown in fig. 9, each set of locking mechanism includes a screw 8, a bushing 9, a first internal thread sleeve 10, and a second internal thread sleeve 11; the spindle box 1 is provided with three parallel unthreaded holes 1-1 and three parallel spindle sleeve holes 1-2, each spindle sleeve 4 is arranged in the spindle sleeve hole 1-2 in a sliding mode through a key, each unthreaded hole 1-1 is perpendicular to and communicated with each spindle sleeve hole 1-2, a lining 9 is fixed in each unthreaded hole 1-1, a first internal thread sleeve 10 and a second internal thread sleeve 11 are arranged in each unthreaded hole 1-1 in a sliding mode, a screw 8 penetrates through the lining 9 and is in clearance fit with the lining 9, the first internal thread sleeve 10 and the second internal thread sleeve 11 are respectively in threaded fit with the screw 8, and the internal thread turning directions of the first internal thread sleeve 10 and the second internal thread sleeve 11 are opposite, and arc surfaces matched with the outer surface of the main shaft sleeve 4 are processed on the first internal thread sleeve 10 and the second internal thread sleeve 11.

By screwing the screw 8, the first internal thread sleeve 10 and the second internal thread sleeve 11 move in opposite directions, so that the first internal thread sleeve 10 and the second internal thread sleeve 11 are respectively attached to or separated from the outer surface of the spindle sleeve 4, and the spindle sleeve 4 is locked or loosened.

As shown in figure 1, when two parallel T-shaped grooves of the milling workbench are formed, one main shaft 3 does not extend, the other two main shafts 3 extend, the feeding amount is the same, the main shaft sleeve 4 is clamped and locked through the locking mechanism, and the problems that the surface of a machined workpiece is uneven and deviation occurs due to play caused by the influence of a small gap when the main shaft sleeve 4 is meshed with the worm wheel 7-1 are solved. The left milling head A4 and the right milling head A5 mill simultaneously and move towards the center of the processing platform A3, four T-shaped grooves can be milled simultaneously in one-time processing, and the processing efficiency is greatly improved.

Specifically, as shown in fig. 2, the lifting device a6 includes a lifting motor 12, two speed reducers 13, two lifting screws 14, two nuts a, and two sets of lifting guide rails; lifting motor 12, two reduction gears 13 and two sets of lifting guide all fix on support body A1, and lifting motor 12 is biax output motor, all slides on every guide rail in two sets of lifting guide and is provided with the slider, every slider and every screw a respectively with crossbeam A7 fixed connection, two lifting screw 14 rotate and set up on support body A1, and lifting motor 12 passes through the input end fixed connection of axle with two reduction gears 13, the output of every reduction gear 13 and every lifting screw 14 fixed connection, every lifting screw 14 and every screw a screw-thread fit connection, and two reduction gears 13 of lifting motor 12 drive make crossbeam A7 can reciprocate along two sets of lifting guide.

Two output ends of the lifting motor 12 are respectively and fixedly connected with a speed reducer 13 through a shaft, wherein each shaft is connected with the lifting motor 12 and each shaft is connected with the speed reducer 13 through a coupler. When guaranteeing crossbeam A7 and sliding along the lift guide, the nut a speed of crossbeam A7 both sides is the same to prevent the dead problem of card, use a motor as power simultaneously, reduce cost.

While the invention has been described in detail and with reference to specific examples thereof, it will be understood by those skilled in the art that the foregoing examples are for the purpose of illustration only and are not intended to limit the scope of the invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.

Claims (8)

1. A special machine tool for processing numerical control mills car or merry go round machine large-scale workstation T type groove, its characterized in that: comprises a frame body (A1), a base (A2), a processing platform (A3), a left milling head (A4), a right milling head (A5), a lifting device (A6) and a cross beam (A7); crossbeam (A7) passes through elevating gear (A6) and sets up and can reciprocate on support body (A1), base (A2) and support body (A1) fixed connection, processing platform (A3) rotate and set up on base (A2) and through motor drive, left side cutter head (A4) and right cutter head (A5) all slide through the guide rail and set up on crossbeam (A7), all be fixed with a screw nut (A9) on left side cutter head (A4) and right cutter head (A5), it is provided with two lead screws (A8) to rotate on crossbeam (A7), every lead screw passes through gear motor drive energy and makes left cutter head (A4) and right cutter head (A5) along guide rail lateral shifting on the crossbeam, every screw nut (A9) and every lead screw (A8) screw-thread fit.

2. The special machine tool for machining the T-shaped groove of the large-scale workbench of the numerical control milling machine or the vertical lathe according to claim 1, characterized in that: the left milling head (A4) and the right milling head (A5) are identical in structure, and the left milling head (A4) comprises a spindle box (1), a speed regulation driving mechanism (2), three spindles (3) and three spindle sleeves (4);

three spindle sleeves (4) which are arranged in parallel are arranged on the spindle box (1), a spindle (3) is rotationally arranged in each spindle sleeve (4), a gear (6) is arranged on each spindle (3), each gear (6) is connected with each spindle (3) through a key, the gear (6) on one spindle (3) is meshed with the gears (6) on the other two spindles (3), and the gear (6) on one spindle of the three spindles (3) is driven by the speed-regulating driving mechanism (2);

and a nut (A9) is fixed on each spindle box (1) of the left milling head (A4) and the right milling head (A5).

3. The special machine tool for machining the T-shaped groove of the large-scale workbench of the numerical control milling machine or the vertical lathe according to claim 2, characterized in that: the speed regulation driving mechanism (2) comprises a motor (2-1), an IV shaft (2-2), an IVa shaft (2-3), a V shaft (2-4), a VI shaft (2-5) and two shifting forks (2-7);

an IV shaft (2-2), an IVa shaft (2-3), a V shaft (2-4) and a VI shaft (2-5) are rotationally arranged on the spindle box (1), the VI shaft (2-5) is driven by a motor (2-1), the VI shaft (2-5) is fixedly provided with a gear a (2-8), the IV shaft (2-2) is fixedly provided with a gear b (2-9), a gear c (2-10), a gear d (2-11) and a gear e (2-12), the gear a (2-8) is meshed with the gear b (2-9), the IVa shaft (2-3) is fixedly provided with a gear f (2-13), a gear g (2-14) and a gear k (2-15), a gear (6) on one spindle (3) of the three spindles (3) is meshed with the gear f (2-13), a duplicate gear (2-16) and a triple gear (2-17) are arranged on the V shaft (2-4) in a sliding manner, and the duplicate gear (2-16) and the triple gear (2-17) can slide on the V shaft (2-4) through a shifting fork (2-7) respectively;

when the shifting fork (2-7) shifts the duplicate gears (2-16), the g gears (2-14) and the k gears (2-15) can be meshed with the duplicate gears (2-16) respectively;

when the shifting forks (2-7) shift the triple gears (2-17), the gears (2-10) c, the gears (2-11) d and the gears (2-12) e are meshed with the triple gears (2-17) respectively.

4. The special machine tool for machining the T-shaped groove of the large-scale workbench of the numerical control milling machine or the vertical lathe according to claim 3, characterized in that: the double gears (2-16) are integrated structures formed by machining an H1 gear and an H2 gear, the H1 gear and the g gear (2-14) can be meshed with each other, and the H2 gear and the k gear (2-15) can be meshed with each other.

5. The three-axis milling mechanism for machining a T-shaped groove of a rotary table of a vertical lathe as set forth in claim 3, wherein: the triple gear (2-17) is an integrated structure formed by a T1 gear, a T2 gear and a T3 gear, wherein the T1 gear can be meshed with the c gear (2-10), the T2 gear can be meshed with the d gear (2-11), and the T3 gear can be meshed with the e gear (2-12).

6. The three-axis milling mechanism for machining a T-shaped groove of a rotary table of a vertical lathe as claimed in claim 2, characterized in that: the device is characterized by further comprising three sets of axial feeding adjusting mechanisms (7), wherein each set of axial feeding adjusting mechanism (7) comprises a worm wheel (7-1), a worm (7-2) and a mounting seat (7-3), the worm wheel (7-1) and the worm (7-2) are rotatably arranged on the mounting seat (7-3), the worm wheel (7-1) and the worm (7-2) are meshed with each other, and the mounting seat (7-3) on each set of axial feeding adjusting mechanism (7) is fixed on the spindle box (1);

each spindle sleeve (4) is arranged on the spindle box (1) in a sliding mode through a key, a plurality of wheel grooves (4-1) with equal intervals are machined in the outer surface of each spindle sleeve (4), a worm wheel (7-1) on each set of axial feeding adjusting mechanism (7) is matched with the wheel grooves (4-1) on each spindle sleeve (4), and when the worm (7-2) is rotated, the spindle sleeves (4) can move axially along the spindle sleeves.

7. The special machine tool milling head feeding mechanism according to claim 2, characterized in that: the locking mechanism comprises a screw rod (8), a bushing (9), a first internal thread sleeve (10) and a second internal thread sleeve (11); the spindle box (1) is provided with three parallel unthreaded holes (1-1) and three parallel spindle sleeve holes (1-2), each spindle sleeve (4) is arranged in the spindle sleeve hole (1-2) in a sliding mode through a key, each unthreaded hole (1-1) and each spindle sleeve hole (1-2) are perpendicular to each other and are communicated with each other, a lining (9) is fixed in each unthreaded hole (1-1), a first internal thread sleeve (10) and a second internal thread sleeve (11) are arranged in each unthreaded hole (1-1) in a sliding mode, a screw (8) penetrates through the lining (9) and is in clearance fit with the lining (9), the first internal thread sleeve (10) and the second internal thread sleeve (11) are respectively in threaded fit with the screw (8), and the internal thread rotating directions of the first internal thread sleeve (10) and the second internal thread sleeve (11) are opposite, arc surfaces matched with the outer surface of the main shaft sleeve (4) are processed on the first internal thread sleeve (10) and the second internal thread sleeve (11).

8. The special machine tool milling head feeding mechanism according to claim 1, characterized in that: the lifting device (A6) comprises a lifting motor (12), two speed reducers (13), two lifting screw rods (14), two nuts a and two groups of lifting guide rails; lifting motor (12), two reduction gears (13) and two sets of lifting guide all fix on support body (A1), all slide on every guide rail in two sets of lifting guide and be provided with the slider, every slider and every screw a respectively with crossbeam (A7) fixed connection, two lifting screw (14) rotate and set up on support body (A1), lifting motor (12) pass through the input fixed connection of axle with two reduction gears (13), the output and every lifting screw (14) fixed connection of every reduction gear (13), every lifting screw (14) and every screw a screw-thread fit connection, two reduction gears (13) of lifting motor (12) drive make crossbeam (A7) can reciprocate along two sets of lifting guide.

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