CN111300082B

CN111300082B - Milling machine spindle

Info

Publication number: CN111300082B
Application number: CN202010183721.6A
Authority: CN
Inventors: 吴明伟; 王敏侠; 孙勇
Original assignee: Jinan Guozhu Machinery Co ltd
Current assignee: Jinan Guozhu Machinery Co ltd
Priority date: 2020-03-16
Filing date: 2020-03-16
Publication date: 2022-01-07
Anticipated expiration: 2040-03-16
Also published as: CN111300082A

Abstract

The invention relates to the technical field of milling machine equipment, in particular to a milling machine spindle, which comprises a spindle body and a shell; the end part of the shaft body is provided with a bevel gear, and a steering gear group is arranged on the circumferential direction of the shaft body; the shell comprises a truss shell, a rotating shell and a protective shell; a driven shaft is arranged in the protective shell; the top end of the driven shaft is provided with a counterweight plate which is rotatably arranged on the driven shaft through a set coaxial bevel gear set; when the tool rotates and mills and acts on a workpiece, the acting force matched with the rotation of the driven shaft can generate corresponding reacting force on the driven shaft, so that the driven shaft vibrates per se, and the milling precision of the tool is influenced; therefore, the counter weight disc arranged on the driven shaft enables the counter weight disc to generate reverse rotation to balance the reaction force generated when the cutter on the driven shaft mills, so that the vibration effect generated to the driven shaft when the cutter mills is reduced, and the milling precision of the cutter driven by the driven shaft is protected.

Description

Milling machine spindle

Technical Field

The invention relates to the technical field of milling machine equipment, in particular to a milling machine spindle.

Background

The spindle part of the numerical control milling machine is one of the core functional parts of the milling machine, and the two types of mechanical spindles and electric spindles are commonly used at present, wherein the quality of the spindle part in the processing process directly influences the processing performance of the whole machine of the milling machine; for a description of the milling machine spindle performance parameters, see: juanjuan et al, numerical control milling machine spindle parts comprehensive performance testing technology research [ J ], automation of manufacturing industry, 2018(No.8) 5-9.

At present, when a milling machine spindle is used for machining a workpiece, a tool rotating at a high speed is superposed with a driving spindle acting force during milling to cause vibration of a spindle body, and meanwhile, after the spindle runs for a long time, the temperature of a shaft body accumulated in the shaft body rises to cause thermal deformation of the shaft body, and finally the machining precision of the spindle is influenced.

Some technical solutions of a spindle of a numerically controlled milling machine also exist in the prior art, and for example, a chinese patent with application number 2018106500042 discloses a spindle box structure of a numerically controlled milling machine, which includes a first box, a second box, a guide rail, and a slider, wherein a rear end surface of the first box is mounted on a column, the guide rail and the second box are both mounted on a front end surface of the first box, one end of the slider is fixed on the second box, the other end of the slider is connected with the guide rail, and the slider slides along the guide rail along with rotation of the second box; in the technical scheme, the spindle box has higher anti-overturning capacity and the rigidity of the whole structure of the spindle box is enhanced through the connection of the guide rail and the slide block; meanwhile, the method is beneficial to improving the flutter condition of the cutter, and reduces the surface roughness and waviness of the blade, thereby improving the machining precision of a machine tool and further improving the machining quality of the blade; however, the technical scheme does not solve the problems of vibration of a cutter on the milling machine spindle during workpiece processing and thermal deformation of the spindle body, so that the milling machine processing precision in the technical scheme is influenced.

In view of this, in order to overcome the above technical problems, the present company has designed and developed a milling machine spindle, which adopts a special spindle structure to solve the above technical problems.

Disclosure of Invention

In order to make up for the defects of the prior art, the invention provides the milling machine spindle, the weight disc arranged at the top end of the driven shaft and the coaxial bevel gear set arranged between the driven shaft and the weight disc are used, when the driven shaft drives a cutter to mill, the weight disc is enabled to rotate in a direction opposite to the rotation direction of the driven shaft, so that the acting force generated when the driven shaft rotates is balanced, the vibration effect generated when the cutter on the driven shaft mills is further reduced, and the milling precision of the cutter driven by the driven shaft is protected.

The milling machine spindle comprises a spindle body and a shell; the end part of the shaft body is provided with a bevel gear, and a steering gear group is arranged on the circumferential direction of the shaft body; a bearing is arranged in the shell, and the bearing enables the shaft body to be rotatably arranged in the shell; the shell comprises a truss shell, a rotating shell and a protective shell; the truss shell is fixed on an upright post of the milling machine, a rotating shell is arranged at the top end of the truss shell, and a protective shell is arranged at the top end of the rotating shell; the protective shell, the rotating shell and the truss shell are in rotating connection; a transmission shaft is arranged in the truss shell and is rotatably arranged on a driving shaft of the milling machine; a rotating shaft is arranged in the rotating shell; a driven shaft is arranged in the protective shell; the driven shaft, the rotating shaft and the transmission shaft are in meshing transmission through bevel gears; the bottom end of the driven shaft is provided with a cutter clamping device, and the top end of the driven shaft is provided with a counterweight plate; the counterweight plate is rotatably arranged on the driven shaft, and a coaxial bevel gear group is arranged between the counterweight plate and the driven shaft; steering gear sets are respectively arranged on the transmission shaft and the rotating shaft; when the milling machine works, a cutter on a driven shaft is milled by a driving shaft of the milling machine through meshing transmission of a bevel gear, a rotating shaft and the driven shaft are enabled to rotate relative to the driving shaft together by adjusting a steering gear group on the driving shaft, the steering gear group on the rotating shaft is adjusted, the driven shaft rotates relative to the steering shaft, and then the cutter on the driven shaft can freely adjust a milling angle; through the counterweight disc arranged at the top end of the driven shaft and the coaxial bevel gear group arranged between the driven shaft and the counterweight disc, when the driven shaft drives the cutter to mill, the counterweight disc rotates in a direction opposite to the rotation direction of the driven shaft to balance the acting force of the driven shaft when the driven shaft rotates, so that the vibration effect of the cutter on the driven shaft during milling is reduced; the invention utilizes the counterweight disk arranged on the driven shaft to enable the counterweight disk to generate reverse rotation to balance the reaction force generated when the cutter on the driven shaft mills, thereby reducing the vibration effect generated to the driven shaft when the cutter mills and protecting the milling precision of the cutter driven by the driven shaft.

Preferably, the counterweight plate comprises a central plate and an annular plate, and the annular plate surrounds the outer side of the central plate; fins are arranged in a gap between the central disc and the annular disc; the fins are annularly distributed between the central disc and the annular disc and connect the central disc and the annular disc; when the device works, the driven shaft rotates to drive the cutter to mill the reaction force of a workpiece, so that the vibration of the driven shaft is caused, in order to balance the reaction force of the cutter on the driven shaft by the reverse action force generated by the rotation of the counterweight disc, the rotating speed of the counterweight disc matched with the driven shaft is required, the stability of the structure of the counterweight disc is reduced, and meanwhile, heat can be gradually generated and accumulated in the high-speed rotation process of the driven shaft, so that the temperature of the driven shaft is increased to generate thermal deformation, the size precision of the driven shaft is influenced, and the service life of the driven shaft is reduced; through the arranged annular disc, the gravity center of the rotating counterweight disc is shifted outwards, so that the acting force moment of the rotation of the counterweight disc is increased, the reaction force generated by the high-speed rotation of the driven shaft is easily balanced, the high-speed rotation of the counterweight disc is avoided, and the structural stability of the counterweight disc on the driven shaft is protected; the heat guided to the central disc by the driven shaft is transferred to the fins through the fins arranged between the central disc and the annular disc, the contact area between the fins and air is increased, the heat dissipation is accelerated, and the temperature of the driven shaft is kept in a proper range; thereby ensuring the milling precision of the cutter on the driven shaft.

Preferably, a heat dissipation fan is arranged above the counterweight plate, an air hole is formed in a protective shell above the heat dissipation fan, and the heat dissipation fan sucks cold air outside the top of the driven shaft and blows the cold air to the driven shaft through annular fins of the counterweight plate; when the cutter milling device works, in the cutter milling process, heat generated by the driven shaft is transmitted to the fins through the central disc, and the temperature of air distributed among the fins outside the central disc is increased, so that the inside of the protective shell is at a higher temperature level, and the heat dissipation of the driven shaft is finally not facilitated; through the heat dissipation fan that sets up on the central disk, the heat dissipation fan blows the outside air of protective housing to the fin, has strengthened the radiating effect of fin, has kept the temperature of driven shaft then in suitable scope, makes the milling precision of cutter on the driven shaft obtain guaranteeing.

Preferably, a diversion shell is arranged on the outer side of the driven shaft and wraps the driven shaft; a gap formed between the diversion shell and the driven shaft is set as a diversion layer, and the bottom end of the diversion layer is communicated to the bottom of the clamped milling cutter; when the device works, the heat accumulated on the driven shaft comes from the milling effect of the cutter, and when the milling area is cooled by using cooling liquid, part of the heat is transferred to the driven shaft from the cutter; through the diversion layer that the blower inlet casing that sets up constitutes, the cold wind that blows off the heat dissipation fan direction cutter has promoted the radiating effect of cutter, and when dismantling the cutter simultaneously, the amount of wind that blows off from the diversion layer plays the clearance effect to the sword bits that produce in milling, has kept the size precision and the clean and tidy of driven shaft tip anchor clamps to maintain the clamping precision of driven shaft to the cutter.

Preferably, the outer side of the bevel gear is provided with a heat conduction ring which is of a partial annular structure; an independent cavity is arranged in the shell corresponding to the bevel gear, the cavity wraps the meshed bevel gear area, and gear oil is filled in the cavity; when the tool works, the cutter is driven to mill by the bevel gear in meshing transmission, gear oil in the cavity plays roles of lubricating and conducting heat to the bevel gear in meshing transmission, a large amount of heat can be generated by high-speed rotation between the bevel gears, the cavity and the shell are made of high-strength rigid materials, the heat transfer efficiency of the cavity is low, the heat of the gear oil in the cavity cannot be transferred quickly in time, the bevel gear in transmission is enabled to be at a high temperature, and the service lives of the bevel gear and the gear oil are shortened; through the heat conduction ring that sets up in the bevel gear outside, the heat in the gear oil in cavity is outwards volatilized to the heat conduction ring, has stabilized the inside temperature of cavity for the heat that bevel gear produced in the meshing transmission outwards conducts fast, thereby makes the temperature in the cavity be in reasonable within range, ensures bevel gear's transmission precision.

Preferably, the heat conduction ring is provided with a support rod, and the heat conduction ring is fixedly arranged in the cavity corresponding to the bevel gear through the support rod; when the bevel gear cooling device works, the cutter is used for adjusting the angle, and the driven shaft and the rotating shaft generate corresponding angle change relative to the transmission shaft, so that the position of the bevel gear relative to the heat conducting ring is changed, and the heat radiating effect of the bevel gear by the heat conducting ring is influenced; the heat conduction ring is fixed in the cavity corresponding to the bevel gear through the supporting rod, when the driven shaft rotates with the rotating shaft, the position of the heat conduction ring is changed along with the rotating cavity, so that the relative position of the heat conduction ring and the bevel gear is not changed, the heat dissipation effect of the heat conduction ring on the bevel gear is maintained, and the transmission precision of the bevel gear is protected.

The invention has the following beneficial effects:

1. according to the invention, the counter weight disc arranged on the driven shaft is used for generating reverse rotation to balance the reaction force generated during milling of the cutter on the driven shaft, so that the vibration effect generated on the driven shaft during milling of the cutter is reduced; the arranged annular disc enables the gravity center of the rotating counterweight disc to shift outwards, so that the acting force moment of the rotation of the counterweight disc is increased, the reaction force generated by the high-speed rotation of the driven shaft is easily balanced, and the stability of the counterweight disc structure on the driven shaft is protected; the fins arranged between the central disc and the annular disc increase the contact area with air and accelerate the heat dissipation; the heat dissipation fan arranged on the central disc blows air outside the protective shell to the fins, so that the heat dissipation effect of the fins is enhanced; the diversion shell that sets up constitutes the diversion layer, has promoted the radiating effect of cutter to maintain the clamping precision of driven shaft to the cutter.

2. According to the invention, the heat conducting ring arranged on the outer side of the bevel gear is used for volatilizing the heat in the gear oil in the cavity outwards, so that the temperature in the cavity is stabilized, the temperature in the cavity is in a reasonable range, and the transmission precision of the bevel gear is ensured; the supporting rod is used for fixing the heat conduction ring in the cavity corresponding to the bevel gear, when the driven shaft rotates with the rotating shaft, the position of the heat conduction ring is changed along with the rotating cavity, so that the relative position of the heat conduction ring and the bevel gear is not changed, the heat dissipation effect of the heat conduction ring on the bevel gear is maintained, and the transmission precision of the bevel gear is protected.

Drawings

The invention is further described with reference to the following figures and embodiments.

FIG. 1 is a perspective view of a milling spindle of the present invention;

FIG. 2 is a side view of the spindle of the milling machine of the present invention;

FIG. 3 is a perspective view of a component of the milling spindle of the present invention;

FIG. 4 is a cross-sectional view A-A of FIG. 2;

in the figure: the structure comprises a shaft body 1, a bevel gear 11, a heat conduction ring 111, a support rod 112, a steering gear group 12, a shell 2, a truss shell 21, a rotating shell 22, a protective shell 23, a cavity 24, a transmission shaft 3, a rotating shaft 4, a driven shaft 5, a counterweight plate 51, a coaxial bevel gear group 511, a central plate 52, an annular plate 53, fins 54, a heat dissipation fan 55 and a diversion shell 56.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.

As shown in fig. 1 to 4, a milling machine spindle according to the present invention includes a shaft body 1 and a housing 2; a bevel gear 11 is arranged at the end part of the shaft body 1, and a steering gear group 12 is arranged on the circumferential direction of the shaft body 1; a bearing is arranged in the shell 2, and the bearing enables the shaft body 1 to be rotatably arranged in the shell 2; the shell 2 comprises a truss shell 21, a rotating shell 22 and a protective shell 23; the truss shell 21 is fixed on a stand column of a milling machine, a rotating shell 22 is arranged at the top end of the truss shell 21, and a protective shell 23 is arranged at the top end of the rotating shell 22; the protective shell 23, the rotating shell 22 and the truss shell 21 are in rotating connection; a transmission shaft 3 is arranged in the truss shell 21, and the transmission shaft 3 is rotatably arranged on a driving shaft of the milling machine; a rotating shaft 4 is arranged in the rotating shell 22; a driven shaft 5 is arranged in the protective shell 23; the driven shaft 5, the rotating shaft 4 and the transmission shaft 3 are in meshing transmission through a bevel gear 11; a cutter clamping device is arranged at the bottom end of the driven shaft 5, and a counterweight disc 51 is arranged at the top end of the driven shaft 5; the counterweight disc 51 is rotatably arranged on the driven shaft 5, and a coaxial bevel gear group 511 is arranged between the counterweight disc 51 and the driven shaft 5; the transmission shaft 3 and the rotating shaft 4 are respectively provided with a steering gear set 12; when the milling machine works, a cutter on the driven shaft 5 is milled by the driving shaft of the milling machine through the meshing transmission of the bevel gear 11, the rotating shaft 4 and the driven shaft 5 jointly rotate relative to the driving shaft 3 by adjusting the steering gear group 12 on the driving shaft 3, the steering gear group 12 on the rotating shaft 4 is adjusted, the driven shaft 5 rotates relative to the steering shaft, and then the cutter on the driven shaft 5 can freely adjust the milling angle; through the counterweight disc 51 arranged at the top end of the driven shaft 5 and the coaxial bevel gear group 511 arranged between the driven shaft 5 and the counterweight disc 51, when the driven shaft 5 drives a cutter to mill, the counterweight disc 51 rotates in a direction opposite to the rotation direction of the driven shaft 5, so that the acting force of the driven shaft 5 during rotation is balanced, and the vibration effect of the cutter on the driven shaft 5 during milling is further reduced; the invention utilizes the counterweight disk 51 arranged on the driven shaft 5 to ensure that the counterweight disk 51 generates reverse rotation to balance the reaction force generated when the cutter on the driven shaft 5 mills, thereby reducing the vibration effect generated on the driven shaft 5 when the cutter mills and protecting the milling precision of the cutter driven by the driven shaft 5.

As an embodiment of the present invention, the weight plate 51 includes a central plate 52 and an annular plate 53, the annular plate 53 surrounds the outer side of the central plate 52; a fin 54 is arranged in a gap between the central disc 52 and the annular disc 53; the fins 54 are annularly distributed between the central disc 52 and the annular disc 53, and the fins 54 connect the central disc 52 with the annular disc 53; when the device works, the driven shaft 5 rotates to drive a cutter to mill the reaction force of a workpiece, so that the driven shaft 5 vibrates, in order to balance the reaction force of the cutter on the driven shaft 5 by the reverse reaction force generated by the rotation of the counterweight disc 51, the counterweight disc 51 needs to be matched with the rotating speed of the driven shaft 5, the stability of the structure of the counterweight disc 51 is reduced, and meanwhile, in the high-speed rotation process of the driven shaft 5, heat can be gradually generated and accumulated, so that the temperature of the driven shaft 5 is increased to generate thermal deformation, the size precision of the driven shaft 5 is influenced, and the service life of the driven shaft 5 is shortened; through the arranged annular disc 53, the gravity center of the rotating counterweight disc 51 is shifted outwards, so that the acting force moment of the rotation of the counterweight disc 51 is increased, the reaction force generated by the high-speed rotation of the driven shaft 5 is easily balanced, the high-speed rotation of the counterweight disc 51 is avoided, and the structural stability of the counterweight disc 51 on the driven shaft 5 is protected; the heat guided to the central disc 52 by the driven shaft 5 is transferred to the fins 54 by the fins 54 arranged between the central disc 52 and the annular disc 53, the arranged fins 54 increase the contact area with the air, accelerate the dissipation of the heat and keep the temperature of the driven shaft 5 in a proper range; thereby ensuring the milling accuracy of the tool on the driven shaft 5.

As an embodiment of the present invention, a heat dissipation fan 55 is disposed above the weight plate 51, an air hole is disposed on the protective casing 23 above the heat dissipation fan 55, and the heat dissipation fan 55 sucks cold air outside the top of the driven shaft 5 and blows the cold air to the driven shaft 5 through the annular fins 54 of the weight plate 51; during operation, in the milling process of the cutter, the heat generated by the driven shaft 5 is transferred to the fins 54 through the central disc 52, and the temperature of the air distributed among the fins 54 outside the central disc 52 is increased, so that the inside of the protective shell 23 is at a higher temperature level, and finally the heat dissipation of the driven shaft 5 is not facilitated; through the heat dissipation fan 55 arranged on the central disc 52, the heat dissipation fan 55 blows air outside the protective shell 23 to the fins 54, so that the heat dissipation effect of the fins 54 is enhanced, the temperature of the driven shaft 5 is kept within a proper range, and the milling precision of a cutter on the driven shaft 5 is ensured.

As an embodiment of the present invention, a guide shell 56 is disposed on the outer side of the driven shaft 5, and the guide shell 56 wraps the driven shaft 5; a gap formed between the diversion shell 56 and the driven shaft 5 is set as a diversion layer, and the bottom end of the diversion layer is led to the bottom of the clamped milling cutter; when the cooling device works, the heat accumulated on the driven shaft 5 comes from the milling effect of the cutter, and when the milling area is cooled by using cooling liquid, part of the heat is transferred to the driven shaft 5 from the cutter; through the diversion layer that the blower housing 56 that sets up constitutes, the cold wind that blows off heat dissipation fan 55 direction cutter has promoted the radiating effect of cutter, and when dismantling the cutter simultaneously, the amount of wind that blows off from the diversion layer plays the clearance effect to the sword bits that produce in milling, has kept the dimensional accuracy and the clean and tidy of 5 tip anchor clamps of driven shaft to maintain the clamping accuracy of driven shaft 5 to the cutter.

As an embodiment of the present invention, a heat conduction ring 111 is disposed on the outer side of the bevel gear 11, and the heat conduction ring 111 is a partial annular structure; an independent cavity 24 is arranged inside the shell 2 corresponding to the bevel gear 11, the cavity 24 wraps the area of the engaged bevel gear 11, and gear oil is filled in the cavity 24; when the tool works, the cutter is driven to mill by the bevel gear 11 in meshing transmission, gear oil in the cavity 24 plays roles of lubricating and conducting heat for the bevel gear 11 in meshing transmission, a large amount of heat can be generated by high-speed rotation between the bevel gears 11, the cavity 24 and the shell 2 are made of high-strength rigid materials, the heat transfer efficiency of the cavity is low, the heat of the gear oil in the cavity cannot be transferred quickly in time, the bevel gear 11 in transmission is enabled to be at a high temperature, and the service lives of the bevel gear 11 and the gear oil are shortened; through the heat conduction ring 111 that sets up in the bevel gear 11 outside, heat in the gear oil outwards volatilizees in cavity 24 by heat conduction ring 111, has stabilized the inside temperature of cavity 24 for the heat that bevel gear 11 produced outwards conducts fast in the meshing transmission, thereby makes the temperature in cavity 24 be in reasonable within range, ensures bevel gear 11's transmission precision.

As an embodiment of the present invention, the heat conducting ring 111 is provided with supporting rods 112, and the heat conducting ring 111 is fixedly installed in the corresponding cavity 24 of the bevel gear 11 through the supporting rods 112; when the bevel gear cooling device works, the cutter is used for adjusting the angle, the driven shaft 5 and the rotating shaft 4 generate corresponding angle change relative to the transmission shaft 3, so that the position of the bevel gear 11 relative to the heat conducting ring 111 is changed, and the heat radiating effect of the heat conducting ring 111 on the bevel gear 11 is influenced; the heat conduction ring 111 is fixed in the cavity 24 corresponding to the bevel gear 11 through the arranged support rod 112, and when the driven shaft 5 and the rotating shaft 4 rotate, the position of the heat conduction ring 111 is changed along with the rotating cavity 24, so that the relative position of the heat conduction ring 111 and the bevel gear 11 is not changed, the heat dissipation effect of the heat conduction ring 111 on the bevel gear 11 is maintained, and the transmission precision of the bevel gear 11 is further protected.

When the milling machine works, a cutter on the driven shaft 5 is milled by the driving shaft of the milling machine through the meshing transmission of the bevel gear 11, the rotating shaft 4 and the driven shaft 5 jointly rotate relative to the driving shaft 3 through adjusting the steering gear group 12 on the driving shaft 3, the steering gear group 12 on the rotating shaft 4 is adjusted, the driven shaft 5 rotates relative to the driving shaft, and the cutter on the driven shaft 5 can freely adjust the milling angle; through the counterweight disc 51 arranged at the top end of the driven shaft 5 and the coaxial bevel gear group 511 arranged between the driven shaft 5 and the counterweight disc 51, when the driven shaft 5 drives a cutter to mill, the counterweight disc 51 rotates in a direction opposite to the rotation direction of the driven shaft 5, so that the acting force of the driven shaft 5 during rotation is balanced, and the vibration effect of the cutter on the driven shaft 5 during milling is further reduced; the arranged annular disc 53 enables the gravity center of the rotating counterweight disc 51 to shift outwards, so that the acting force moment of the rotation of the counterweight disc 51 is increased, the reaction force generated by the high-speed rotation of the driven shaft 5 is easily balanced, and the structural stability of the counterweight disc 51 on the driven shaft 5 is protected; the heat guided to the central disc 52 by the driven shaft 5 is transferred to the fins 54 by the fins 54 arranged between the central disc 52 and the annular disc 53, the arranged fins 54 increase the contact area with the air, accelerate the dissipation of the heat and keep the temperature of the driven shaft 5 in a proper range; the heat dissipation fan 55 arranged on the central disc 52 blows air outside the protective shell 23 toward the fins 54, so that the heat dissipation effect of the fins 54 is enhanced, and the temperature of the driven shaft 5 is kept within a proper range; the guide layer formed by the guide shell 56 guides cold air blown out by the heat dissipation fan 55 to the cutter, so that the heat dissipation effect of the cutter is improved, and meanwhile, when the cutter is detached, the air blown out from the guide layer plays a role in cleaning cutter scraps generated in milling, so that the dimensional accuracy and the neatness of the clamp at the end part of the driven shaft 5 are kept; the heat conducting ring 111 is arranged on the outer side of the bevel gear 11, the heat conducting ring 111 volatilizes heat in gear oil in the cavity 24 outwards, the temperature inside the cavity 24 is stabilized, and heat generated by the bevel gear 11 in meshing transmission is rapidly conducted outwards, so that the temperature in the cavity 24 is in a reasonable range; the supporting rod 112 fixes the heat conducting ring 111 in the cavity 24 corresponding to the bevel gear 11, and when the driven shaft 5 and the rotating shaft 4 rotate, the position of the heat conducting ring 111 changes along with the rotating cavity 24, so that the relative position of the heat conducting ring 111 and the bevel gear 11 does not change, the heat radiating effect of the heat conducting ring 111 on the bevel gear 11 is maintained, and the transmission precision of the bevel gear 11 is further protected.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A milling machine spindle comprises a spindle body (1) and a shell (2); a bevel gear (11) is arranged at the end part of the shaft body (1), and a steering gear group (12) is arranged on the circumferential direction of the shaft body (1); a bearing is arranged in the shell (2), and the bearing enables the shaft body (1) to be rotatably arranged in the shell (2); the method is characterized in that: the shell (2) comprises a truss shell (21), a rotating shell (22) and a protective shell (23); the truss shell (21) is fixed on an upright post of a milling machine, a rotating shell (22) is arranged at the top end of the truss shell (21), and a protective shell (23) is arranged at the top end of the rotating shell (22); the protective shell (23), the rotating shell (22) and the truss shell (21) are in rotating connection; a transmission shaft (3) is arranged in the truss shell (21), and the transmission shaft (3) is rotatably arranged on a driving shaft of the milling machine; a rotating shaft (4) is arranged in the rotating shell (22); a driven shaft (5) is arranged in the protective shell (23); the driven shaft (5), the rotating shaft (4) and the transmission shaft (3) are in meshing transmission through a bevel gear (11); a cutter clamping device is arranged at the bottom end of the driven shaft (5), and a counterweight plate (51) is arranged at the top end of the driven shaft (5); the counterweight plate (51) is rotatably arranged on the driven shaft (5), and a coaxial bevel gear group (511) is arranged between the counterweight plate (51) and the driven shaft (5); steering gear sets (12) are respectively arranged on the transmission shaft (3) and the rotating shaft (4);

the counterweight plate (51) comprises a central plate (52) and an annular plate (53), and the annular plate (53) surrounds the outer side of the central plate (52); fins (54) are arranged in a gap between the central disc (52) and the annular disc (53); the fins (54) are annularly distributed between the central disc (52) and the annular disc (53), and the fins (54) connect the central disc (52) with the annular disc (53);

a heat dissipation fan (55) is arranged above the counterweight plate (51), an air hole is formed in the protective shell (23) above the heat dissipation fan (55), and cold air on the outer side of the top of the driven shaft (5) is sucked in by the heat dissipation fan (55) and blown to the driven shaft (5) through the annular fins (54) of the counterweight plate (51);

a diversion shell (56) is arranged on the outer side of the driven shaft (5), and the driven shaft (5) is wrapped by the diversion shell (56); a gap formed between the diversion shell (56) and the driven shaft (5) is set as a diversion layer, and the bottom end of the diversion layer is led to the bottom of the clamped milling cutter;

the outer side of the bevel gear (11) is provided with a heat conduction ring (111), and the heat conduction ring (111) is of a partial annular structure; an independent cavity (24) is arranged inside the shell (2) corresponding to the bevel gear (11), the cavity (24) wraps the area of the engaged bevel gear (11), and gear oil is filled in the cavity (24);

the heat conduction ring (111) is provided with a support rod (112), and the heat conduction ring (111) is fixedly arranged in the cavity (24) corresponding to the bevel gear (11) through the support rod (112).