CN214237287U - Planetary speed-increasing and lengthening numerical control milling head - Google Patents

Abstract

The utility model discloses a planet acceleration rate extension numerical control cutter head, including connector, lower mouse chain wheel, drive awl, dustproof dish, first spring, first O type sealing washer, second spring, taper sleeve, box, ring flange, manger plate dish, extension head main shaft, planet acceleration mechanism, pine clamp sword mechanism and main shaft unit. The utility model discloses a planet wheel, sun gear and ring gear transmission lathe main shaft moment of torsion of planet speed increasing mechanism can obtain the rotational speed and the moment of torsion that satisfy the requirement through the size of adjustment gear modulus, number of teeth and bearing on reaching extension head main shaft. The utility model has compact structure, completes the improvement of the rotating speed in the limited space, processes the spiral circulating groove outside the inner gear ring for the cooling liquid to take away the heat generated by the planet speed increasing mechanism, and ensures the precision of the extension head; the planet speed increasing mechanism adopts the bearings arranged in an O shape, so that the support span is ensured, and the stress of the planet speed increasing mechanism is uniform.

Description

Planetary speed-increasing and lengthening numerical control milling head

Technical Field

The utility model relates to a planet acceleration rate extension numerical control cutter head belongs to lathe annex extension head technical field.

Background

The rotating speed of the heavy ram milling head above 60kW is lower, generally 2000rpm, the rotating speed of a machine tool spindle limits the rotating speed of the accessory milling head, the extension head is used as a main member of the accessory milling head, and the rotating speed of the extension head is difficult to meet the requirements of users. With the rapid development of advanced manufacturing industry, higher requirements are put forward on the rotating speed and the torque of the extension head, and the future development trend is to realize high-speed cutting on the premise of ensuring stable structure and larger torque. In the existing extension head, the power of a machine tool spindle is generally transmitted to the extension head spindle through a spline, the transmission ratio of the machine tool spindle to the extension head spindle is 1:1, namely the rotating speed of the extension head is equal to that of the machine tool spindle, and the rotating speed of the extension head is limited by the rotating speed of the machine tool spindle.

Disclosure of Invention

The utility model aims to solve the technical problem that the annex extension head rotational speed is low under the condition that the lathe main shaft rotational speed that exists to prior art is low provides a compact structure, dependable performance, low cost's automatic tool changing planet acceleration rate extension head.

In order to solve the technical problem, the utility model provides a planet acceleration rate extension numerical control milling head, including connector, lower mouse chain wheel, drive awl, dustproof dish, first spring, first O type sealing washer, second spring, taper sleeve, box, ring flange, manger plate dish, extension head main shaft, planet acceleration mechanism, pine clamp sword mechanism and main shaft unit, the box passes through the screw connection with the connector, cylindric lock encapsulating location, the top of connector is fixed with lower mouse chain wheel, lower mouse chain wheel and the last mouse chain wheel phase adaptation of installing on the ram; the planetary speed increasing mechanism, the extension head main shaft and the main shaft unit are arranged in the box body, three sets of bearings are arranged between the extension head main shaft and the inner wall of the box body, and the center of the extension head main shaft is provided with a loosening and clamping cutter mechanism; the dustproof disc is fixed at the lower end of the driving cone, the top end of the second spring abuts against the dustproof disc, and the bottom end of the second spring abuts against the planet carrier; the power input end of the main shaft unit is a machine tool main shaft end face key, the machine tool main shaft end face key is connected with a driving cone, and the driving cone transmits power to the main shaft unit through a planetary speed-increasing mechanism.

The planetary speed increasing mechanism comprises a planetary carrier, bearings, an inner gear ring, planetary wheels, needle bearings and a sun wheel, wherein the inner gear ring is fixed on a box body, the planetary carrier is supported by two sets of bearings fixed on the inner gear ring, the bearings are arranged in an O shape, three sets of planetary wheels are evenly distributed on the planetary carrier through pin shafts and the needle bearings, a driving cone drives the planetary carrier to rotate to transmit power, the planetary carrier rotates to drive the planetary wheels on the planetary carrier to rotate, the upper end surface and the lower end surface of each planetary wheel are provided with a first self-lubricating adjusting pad and a second self-lubricating adjusting pad, gaps are reserved between the first self-lubricating adjusting pad and the second self-lubricating adjusting pad and the end surface of each planetary wheel, the sun wheel is fixed on an extension head main shaft through a rectangular spline with the inner diameter centered, and the planetary speed increasing mechanism is arranged in the box body through the inner gear ring; the input end of the planet speed increasing mechanism is a planet carrier, and the output end of the planet speed increasing mechanism is a sun gear.

The tool loosening and clamping mechanism comprises a support rod, a first adjusting pad, a tool beating rod, a nut, a guide screw, a first spring, a disc spring, a washer, a third adjusting pad, a pull rod and a pull claw. The first spring is arranged in the cutter beating rod, the upper end of the pull rod extends into an inner hole of the driving cone, the top end of the first spring is abutted against the support rod, the bottom end of the first spring is abutted against the cutter beating rod, the support rod is contacted with a pull claw in a machine tool main shaft, and the cutter beating rod is in clearance fit with the inner hole of the driving cone; the disc spring is arranged on the outer side of the pull rod, washers for the disc spring are arranged at the upper end and the lower end of the disc spring, and a third adjusting pad used for adjusting the upper position and the lower position of the pull claw is arranged between the pull claw and the extension head spindle.

The main shaft unit comprises an extension head main shaft, a pressure plate, a screw, a sun gear, a third locking nut, a second double-row cylindrical roller bearing, a circular ring, symmetrical semi-rings, a second locking nut, a long spacer bush, a two-way angular contact ball bearing, an inner spacer bush, an outer spacer bush, a first double-row cylindrical roller bearing, a second adjusting pad, a flange plate and a water retaining plate.

A lower convex waterproof brim is arranged on the lower edge of the dustproof disc, a waterproof groove is processed on the box body, a first O-shaped sealing ring is arranged between the driving cone and the dustproof disc, and a second O-shaped sealing ring and a third O-shaped sealing ring are arranged between the inner gear ring and the box body; processing a vertical water drainage hole in the vertical direction of the waterproof tank, wherein the vertical water drainage hole is communicated with the horizontal water drainage hole; the dustproof disc, the waterproof groove, the first O-shaped sealing ring, the second O-shaped sealing ring, the third O-shaped sealing ring, the vertical drain hole and the horizontal drain hole form integral waterproof, so that liquid leaked above the extension head in the processing process can smoothly flow out of the box body through the drain hole.

The connector is of a reverse 40-degree conical surface structure, a quick connector used for introducing cooling liquid is installed at the top of the connector, and a hole path communicated with the quick connector is formed in the box body.

The outer circle of the inner gear ring is turned with a spiral circulation groove, cooling liquid enters the connector through the quick connector, enters the box body through the connector and then enters the spiral circulation groove of the inner gear ring, the cooling liquid is sprayed out from a nozzle on the end face of the water retaining disc through a cooling hole in the box body, and the cooling liquid is recycled after cooling the cutter.

Has the advantages that: the utility model transmits the torque of the machine tool spindle to the extension head spindle through the planet wheel, the sun wheel and the inner gear ring of the planet speed-increasing mechanism, can obtain the rotating speed and the torque meeting the requirements by adjusting the gear modulus, the tooth number and the size of the bearing, the extension head can be processed at a high rotating speed under 4000rpm, and the maximum torque can reach 1200 Nm; the utility model has compact structure, completes the improvement of the rotating speed in the limited space, processes the spiral circulating groove outside the inner gear ring for the cooling liquid to take away the heat generated by the planet speed increasing mechanism, and ensures the precision of the extension head; the planet speed increasing mechanism adopts the bearings arranged in an O shape, so that the support span is ensured, and the stress of the planet speed increasing mechanism is uniform.

Drawings

Fig. 1 is a schematic structural view of the present invention;

fig. 2 is a cooling pipeline diagram of the utility model:

FIG. 3 is an enlarged view of FIG. 1 at A:

in the figure: 1 support rod, 2 first adjusting pad, 3 cutter bar, 4 lower mouse toothed disc, 5 nuts, 6 guide screws, 7 first spring, 8 driving cone, 9 first locking nut, 10 taper sleeve, 11 machine tool spindle end face key, 12 first O-shaped sealing ring, 13 dustproof disc, 14 vertical water drainage hole, 15 second O-shaped sealing ring, 16 second spring, 17 horizontal water drainage hole, 18 bearing, 19 annular gear, 20 first self-lubricating adjusting pad, 21 planet gear, 22 needle bearing, 23 second self-lubricating adjusting pad, 24 box body, 25 pull claw, 26 first double-row cylindrical roller bearing, 27 second adjusting pad, 28 flange plate, 29 water retaining disc, 30 extension head spindle, 31 outer spacer sleeve, 32 inner spacer sleeve, 33 double-direction angular contact spacer sleeve, 34 long spacer sleeve, 35 pull rod, 36 second locking nut, 37 third adjusting pad, 38 washer, 39 disc spring, 40 symmetrical semi-rings, 41 circular ring, 42 second double-row cylindrical roller bearing, 43 a third locking nut, 44 a sun gear, 45 screws, 46 a pressure plate, 47 a planet carrier, 48 a third O-shaped sealing ring, 49 a quick-connection joint, 50 a connecting body, 51 a pin shaft and 52 a nozzle.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings and examples.

As shown in fig. 1-3, the utility model provides a planet acceleration rate extension numerical control cutter head, including connector 50, lower mouse chain wheel 4, drive awl 8, dustproof dish 13, first spring 7, first O type sealing washer 12, second spring 16, taper sleeve 10, box 24, ring flange 28, manger plate dish 29, extension head main shaft 30, planet acceleration rate mechanism, pine clamp sword mechanism and main shaft unit. The box body 24 is connected with the connector 50 through screws and positioned through cylindrical pin glue pouring, the top of the connector 50 is fixed with the lower mouse chain wheel 4, and when the planetary speed-increasing extension numerical control milling head is clamped through the connector 50, the lower mouse chain wheel 4 is matched with the upper mouse chain wheel arranged on the ram; the planetary speed increasing mechanism, the extension head main shaft 30 and the main shaft unit are arranged in the box body 24, three sets of bearings are arranged between the extension head main shaft 30 and the inner wall of the box body 24, and a cutter loosening and clamping mechanism is arranged in the extension head main shaft 30; the dustproof disc 13 is fixed at the lower end of the driving cone 8, the top end of the second spring 16 abuts against the dustproof disc 13, and the bottom end of the second spring 16 abuts against the planet carrier 47. The power input of the main shaft unit is a machine tool main shaft end face key 11, the machine tool main shaft end face key 11 transmits power to the driving cone 8, the driving cone 8 and the planet carrier 47 perform power transmission through an involute spline, and the planet carrier 47 transmits power to the main shaft unit through a planet speed increasing mechanism. The driving cone 8 and the cone sleeve 10 are pressed by a first locking nut 9 and then combined and processed, the dustproof disc 13 is fixedly connected with the driving cone 8 by using screws, eight groups of second springs 16 below the dustproof disc 13 enable the conical surface of the cone sleeve to abut against the conical hole of the main shaft of the machine tool, the driving cone 8 is concentric with the main shaft of the machine tool due to the combined processing of the driving cone 8 and the cone sleeve 10, the driving cone 8 is matched with a planet carrier 47, the planet carrier 47 is matched with an inner gear ring 19 through a bearing 18 arranged in an O shape, and the inner gear ring 19 is matched with a box body 24 and fixed on the box body 24, so that the concentricity of the main shaft of the machine tool and the box body 24 is ensured; the extension head spindle 30 is concentric with the housing by the first double-row cylindrical roller bearing 26, the second double-row cylindrical roller bearing 42, and the double-angle ball bearing 33, thereby ensuring that the extension head spindle 30 is concentric with the machine tool spindle.

The planetary speed increasing mechanism comprises a planetary carrier 47, a bearing 18, an inner gear ring 19, a planetary wheel 21, a needle bearing 22 and a sun wheel 44, the planetary speed increasing mechanism is installed on the box body 24 through the inner gear ring 19, the gear bearing in the planetary speed increasing mechanism is lubricated by grease, and the planetary speed increasing mechanism completes the increase of the rotating speed of the extension head main shaft 30 through an internal structure. The star frame 47 is supported by two sets of bearings 18 fixed on the inner gear ring 19, the bearings 18 are arranged in an O shape, the supporting span is ensured, and the end surfaces of the bearings 18 are sealed by a labyrinth to prevent dust from entering; three sets of planet wheels 21 are evenly distributed on a planet carrier 47 through a pin shaft 51 and a needle bearing 22, the pin shaft 51 is in small interference fit with the planet carrier 47, a driving cone 8 drives the planet carrier 47 to rotate to transmit power, the planet carrier 47 rotates to drive the planet wheels 21 on the planet carrier 47 to rotate, the power of the planet wheels 21 is transmitted to a sun wheel 44, the rotating speed of the sun wheel 44 is increased, the upper end face and the lower end face of each planet wheel 21 are respectively provided with a first self-lubricating adjusting pad 20 and a second self-lubricating adjusting pad 23, proper contact surfaces are designed between the first self-lubricating adjusting pad 20 and the second self-lubricating adjusting pad 23 and the planet wheels 21, and proper gaps are left between the self-lubricating adjusting pads and the end faces of the planet wheels 21, so that the heat generated by friction is minimum, and the stable and reliable operation of the planet wheels 21 is ensured; the input end of the planetary speed increasing mechanism is a planetary carrier 47, the output end of the planetary speed increasing mechanism is a sun gear 44, the sun gear 44 is matched with the extension head main shaft 30 through the inner diameter centering of a rectangular spline, the rectangular spline transmits power, and the rotating speed of the extension head main shaft 30 is increased in a limited space;

the unclamping cutter mechanism comprises a support rod 1, a first adjusting pad 2, a cutter beating rod 3, a nut 5, a guide screw 6, a first spring 7, a disc spring 39, a washer 38, a third adjusting pad 37, a pull rod 35 and a pull claw 25. The first spring 7 is arranged in the cutter beating rod 3, the upper end of the pull rod 35 extends into an inner hole of the driving cone 8, the top end of the first spring 7 abuts against the support rod 1, the bottom end of the first spring 7 abuts against the cutter beating rod 3, the support rod 1 is kept in the cutter beating rod 3 through the nut 5 and the guide screw 6 under the action of the first spring 7, and the cutter beating rod 3 is in clearance fit with the inner hole of the driving cone 8; the disc spring 39 is installed on the outer side of the pull rod 35, washers 38 for disc spring are installed on the upper and lower ends of the disc spring 39, and a third adjusting pad 37 for adjusting the upper and lower positions of the pull claw 25 is installed between the pull claw 25 and the extension head main shaft 30. When the tool is loosened, the disc spring 39 is compressed by the tool striking force on the pull claw in the machine tool spindle through the support rod 1, the first adjusting pad 2 and the tool striking rod 3, the pull claw 25 is opened to realize tool loosening, and the tool striking amount is realized by adjusting the thickness of the first adjusting pad 2; when the tool is clamped, the tool beating force of the pulling claw in the machine tool spindle is cancelled, the disc spring 39 tensions the pulling claw 25, and the closing degree of the pulling claw 25 is realized by adjusting the third adjusting pad 37.

The main shaft unit comprises an extension head main shaft 30, a pressure plate 46, a screw 45, a sun gear 44, a third locking nut 43, a second double-row cylindrical roller bearing 42, a circular ring 41, symmetrical semi-rings 40, a second locking nut 36, a long spacer 34, a two-way angular contact ball bearing 33, an inner spacer 32, an outer spacer 31, a first double-row cylindrical roller bearing 26, a second adjusting pad 27, a flange 28 and a water retaining plate 29. The sun gear 44 is fixed at the tail end of the extension head main shaft 30 through a pressure plate 46 and a screw 45, and the sun gear 44 is concentric with the extension head main shaft 30 through the inner diameter centering of a rectangular spline; the extension head spindle 30 is supported on the box body 24 through a second double-row cylindrical roller bearing 42, a two-way angular contact ball bearing 33 and a first double-row cylindrical roller bearing 26, and the bearings are lubricated by grease; the inner ring of the second double-row cylindrical roller bearing 42 is pre-tightened through a circular ring 41, symmetrical half rings 40 and a third locking nut 43, and the outer ring of the second double-row cylindrical roller bearing 42 is tightly pressed through a long spacer bush 34; the inner ring of the first double-row cylindrical roller bearing 26 and the double-direction angular contact ball bearing 33 are pre-tightened through a second adjusting pad 27 and a second locking nut 36, and the first double-row cylindrical roller bearing 26 and the double-direction angular contact ball bearing 33 are separated through an inner spacer 32 and an outer spacer 31;

a downward convex waterproof brim is arranged on the lower edge of the dustproof disc 13, the waterproof brim can prevent liquid flowing to the dustproof disc 13 from flowing backwards, a waterproof groove is processed on the box body 24, and the diameter of the waterproof brim is larger than the smaller diameter of the waterproof groove processed on the box body 24; a first O-shaped sealing ring 12 is arranged between the driving cone 8 and the dustproof disc 13 to prevent liquid from flowing into the planetary speed increasing mechanism along a gap between the driving cone 8 and the dustproof disc 13, and a second O-shaped sealing ring 15 and a third O-shaped sealing ring 48 are arranged between the inner gear ring 19 and the box body 24; processing a vertical drainage hole 14 in the vertical direction of the waterproof tank, wherein the vertical drainage hole 14 is communicated with a horizontal drainage hole 17; the integral waterproof design formed by the dustproof disc 13, the waterproof groove, the first O-shaped sealing ring 12 and the water drain hole can prevent liquid leaked by the machine tool spindle from entering the planetary speed increasing mechanism, so that the liquid can enter the space of the waterproof groove, the liquid in the space of the waterproof groove flows to the vertical water drain hole 14, enters the horizontal water drain hole 17 through the vertical water drain hole 14, and the liquid smoothly flows out of the box body 24.

The connecting body 50 is of a reverse 40-degree conical surface structure, when the accessory is clamped, the conical surface bears clamping force, the lower mouse toothed disc 4 and an upper mouse toothed disc arranged on the ram are positioned and clamped, the lower mouse toothed disc 4 is matched with the connecting body 50, and the connecting body 50 and the box body 24 are connected through screws and positioned through cylindrical pin glue pouring; the top of the connecting body 50 is provided with a quick connector 49 for introducing cooling liquid, the cooling liquid enters the connecting body 50 through the quick connector 49, enters the box body 24 through the connecting body 50 and then enters the spiral circulating groove of the inner gear ring 19, enters the box body 24 from the spiral circulating groove and is sprayed to the cutter through a nozzle 52 at the lower end of the box body 24, the cooling function of the cutter with the extension head is realized, the heat generated by the planetary speed increasing mechanism is taken away, and the cooling liquid is recycled after cooling the cutter. The water retaining disc 29, the second adjusting pad 27 and the flange disc 28 form a labyrinth seal, a gap of 0.05-0.1mm is reserved between each labyrinth seal part to prevent cooling water and impurities from entering the bearing, and by adopting the sealing mode, the cooling liquid cannot enter the extension head main shaft 30, so that the lubricating of the bearing is prevented from being influenced due to the leakage of the cutting liquid. Grooves are designed on the circumferential surface of the box body 24, so that the heat dissipation area is increased, and the heat generated by the planetary speed increasing mechanism is ensured to be taken away through a larger heat dissipation area.

The utility model discloses design planet acceleration mechanism in the inside finite space of extension head, planet acceleration mechanism presss from both sides sword mechanism, main shaft unit etc. with the pine and couples compactly, and planet acceleration mechanism input is through driving awl 8 and lathe main shaft hookup, and planet acceleration mechanism output and extension head main shaft 30 hookup, and the extension head is showing through planet acceleration mechanism back rotational speed and is improving. Machining errors and assembly errors between the machine tool main shaft and the extension head main shaft 30 can be borne and eliminated through tooth side gaps among the inner gear ring 19, the planet wheel 21 and the sun wheel 44 in the planet speed increasing mechanism; in addition, the planetary speed increasing mechanism is adopted, the contact area of the gears is large, the transmission torque is large, the transmission structure is compact, and the purpose of speed increasing can be achieved in a limited space.

The utility model discloses a planet acceleration rate extension numerical control cutter head can be processed at 4000rpm low high rotational speed, and the maximum torque can reach 1200 Nm. The planet speed-increasing extension head of the utility model transmits the torque of the main shaft of the machine tool to the extension head main shaft 30 through the planet speed-increasing mechanism, and the extension head tightens the pulling claw 25 through the disc spring 39, thereby realizing the clamping of the cutter; the cutter loosening is realized by compressing the yellow disc through the cutter beating force on the pulling claw in the machine tool spindle to open the pulling claw 25. Under the condition of ensuring the required broach force, the total height of the disc spring is reduced as much as possible to shorten the height of the extension head.

The utility model discloses the annex pine that acceleration rate extension head passes through on the lathe presss from both sides the mechanism tightly, relaxs this extension head to carry out the accurate positioning through last mouse chain wheel on the ram and 4 meshing of lower mouse chain wheel, realize self-holding, automatic relaxation. The extension head transmits the torque of the machine tool spindle to the extension head spindle 30 through the driving cone 8, the planet carrier 47 of the planet speed increasing mechanism, the planet wheel 21 and the sun wheel 44, and the rotating speed and the torque meeting the requirements can be obtained by adjusting the gear modulus, the tooth number and the bearing size.

The utility model discloses compact structure has accomplished the improvement of rotational speed in limited space, and 19 outside processing spiral circulation grooves of ring gear are used for leading to the coolant liquid including, and the slot area of processing has increased heat radiating area on the 24 circumferences of box simultaneously, has taken away the heat that planet acceleration rate mechanism produced, very big reduction the deformation of extension head, guaranteed the precision of extension head.

The utility model discloses planet acceleration mechanism adopts bearing 18 that the O type was arranged, has guaranteed the support span, three planet wheel 21 is evenly distributed on planet carrier 47, drive awl 8 drives planet carrier 47 and rotates the transmission power, planet carrier 47 rotates and drives planet wheel 21 rotatory, planet wheel 21 not only revolves around the main shaft center but also revolves around the axis rotation of itself, planet wheel 21 is connected on planet carrier 47 through round pin axle 51 and bearing 22, the terminal surface installation self-lubricating adjustment pad about planet wheel 21, leave suitable clearance between adjustment pad and the planet wheel 21 terminal surface; the planet wheel 21 transmits power to the sun wheel through an inner gear ring 19 fixed on the box body 24, and the sun wheel 44 is arranged on the extension head main shaft 30 so as to drive the extension head main shaft 30 to rotate.

The above embodiments of the present invention are merely examples, not the only ones, and all changes within the scope of the present invention or the same range of the present invention are all surrounded by the present invention.

Claims (6)

1. The utility model provides a planet acceleration rate extension numerical control cutter head which characterized in that: the device comprises a connecting body (50), a lower mouse toothed disc (4), a driving cone (8), a dustproof disc (13), a first spring (7), a second spring (16), a taper sleeve (10), a box body (24), a flange plate (28), a first adjusting pad (2), a planet speed increasing mechanism, an extension head main shaft (30), a loosening and clamping cutter mechanism and a main shaft unit, wherein the box body (24) is connected with the connecting body (50) through screws and positioned by cylindrical pin glue pouring, the lower mouse toothed disc (4) is fixed at the top of the connecting body (50), and the lower mouse toothed disc (4) is matched with an upper toothed disc arranged on a ram; the planet speed-increasing mechanism, the extension head main shaft (30) and the main shaft unit are arranged in the box body (24), a bearing is arranged between the extension head main shaft (30) and the inner wall of the box body (24), and a cutter loosening and clamping mechanism is arranged in the extension head main shaft (30); the dustproof disc (13) is fixed at the lower end of the driving cone (8), the top end of the second spring (16) is abutted against the dustproof disc (13), and the bottom end of the second spring (16) is abutted against the planet carrier (47); the input end of the main shaft unit is a machine tool main shaft end face key, the end face key is connected with a driving cone (8), and the driving cone (8) is connected with the input end of the planetary speed increasing mechanism through an involute inner spline.

2. The planetary speed-increasing and lengthening numerical control milling head according to claim 1, characterized in that: the planet speed increasing mechanism comprises a planet carrier (47), bearings (18), an inner gear ring (19), planet wheels (21) and a sun wheel (44), wherein the inner gear ring (19) is fixed on a box body (24), the planet carrier (47) is supported by two sets of bearings (18) fixed on the inner gear ring (19), the bearings (18) are arranged in an O shape, three planet wheels (21) are evenly distributed on the planet carrier (47) through pin shafts (51) and needle roller bearings (22), a driving cone (8) drives the planet carrier (47) to rotate to transmit power, and the planet carrier (47) rotates to drive the planet wheels (21) on the planet carrier (47) to rotate; self-lubricating adjusting pads are mounted on the upper end face and the lower end face of the planet wheel (21), a gap is reserved between each adjusting pad and the end face of the planet wheel (21), the sun wheel (44) is fixed on the extension head main shaft (30) through a rectangular spline with a centered inner diameter, and the planet speed increasing mechanism is mounted in the box body (24) through an inner gear ring (19); the input end of the planet speed increasing mechanism is a planet carrier (47), and the output end of the planet speed increasing mechanism is a sun gear (44).

3. The planetary speed-increasing and lengthening numerical control milling head according to claim 1, characterized in that: the tool loosening and clamping mechanism comprises a support rod (1), a first adjusting pad (2), a tool beating rod (3), a nut (5), a guide screw (6), a first spring (7), a disc spring (39), a gasket (38), a third adjusting pad (37), a pull rod (35) and a pull claw (25), wherein the first spring (7) is installed in the tool beating rod (3), the upper end of the pull rod (35) extends into an inner hole of a driving cone (8), the top end of the first spring (7) abuts against the support rod (1), the bottom end of the first spring (7) abuts against the tool beating rod (3), the support rod (1) is in contact with the main milling head pull claw (25), the tool beating rod (3) is in clearance fit with the inner hole of the driving cone (8), and the tool beating rod (3) is supported in the driving cone (8); the disc spring (39) is arranged on the outer side of the pull rod (35), gaskets for the disc spring are arranged at the upper end and the lower end of the disc spring (39), and a third adjusting gasket (37) used for adjusting the upper position and the lower position of the pull claw (25) is arranged between the pull claw (25) and the extension head spindle.

4. The planetary speed-increasing and lengthening numerical control milling head according to claim 1, characterized in that: a lower convex waterproof brim is integrally arranged on the lower edge of the dustproof disc (13), a waterproof groove is processed on the box body (24), a first O-shaped sealing ring (12) is arranged between the driving cone (8) and the dustproof disc (13), and a second O-shaped sealing ring (15) and a third O-shaped sealing ring (48) are arranged between the inner gear ring (19) and the box body (24); a vertical drainage hole (14) is processed in the vertical direction of the waterproof groove, and the vertical drainage hole (14) is communicated with a horizontal drainage hole (17); the whole waterproof structure consisting of the dustproof disc (13), the waterproof groove, the first O-shaped sealing ring (12), the second O-shaped sealing ring (15), the third O-shaped sealing ring (48) and the drain hole can enable liquid leaking from the upper part of the extension head to smoothly flow out of the box body (24) through the drain hole in the processing process.

5. The planetary speed-increasing and lengthening numerical control milling head according to claim 1, characterized in that: the connecting body (50) is of a conical surface structure with an inverted angle of 40 degrees, a quick plug connector (49) for introducing cooling liquid is installed at the top of the connecting body, and a hole path communicated with the quick plug connector (49) is formed in the box body (24).

6. The planetary speed-increasing extension numerical control milling head according to claim 2 or 4, characterized in that: the outer circle of the inner gear ring (19) is turned with a spiral circulation groove, cooling liquid enters a connector (50) through a quick connector (49), enters the box body (24) through the connector (50) and then enters the spiral circulation groove of the inner gear ring (19) to take away heat generated by the planetary speed increasing structure, the cooling liquid is sprayed out from the end face of the box body (24) through cooling holes in the box body (24), and the cooling liquid is recycled after cooling cutters.

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