Machine tool spindle

Abstract

The invention discloses a machine tool spindle, and aims to solve the technical problems that heat accumulation of a rear bearing seat is caused when a'front-middle-rear 'cooling scheme is adopted and heat accumulation of a front bearing seat is easily caused when a'rear-middle-front' cooling scheme is adopted. A cooling liquid channel distributed in a shell layer of a rear bearing seat comprises a rear bearing seat annular cooling channel, a cooling liquid channel distributed in a shell layer of a main shaft body comprises a main shaft body annular cooling channel and a main shaft body axial flow guide channel, and a cooling liquid channel distributed in a shell layer of a front bearing seat comprises a front bearing seat annular cooling channel. When the main shaft cooling system works, cooling liquid flows among the rear bearing seat annular cooling channel, the main shaft body annular cooling channel and the front bearing seat annular cooling channel according to the sequence that the cooling liquid firstly passes through the rear bearing seat annular cooling channel, then passes through the front bearing seat annular cooling channel and finally passes through the main shaft body annular cooling channel.

Description

Technical Field

[0001] The invention relates to a machine tool spindle and a front bearing seat of the machine tool spindle. Background Art

[0002] The applicant provides a machine tool spindle in the patent document with application number 202211525780.2, which has a spindle cooling system. The spindle cooling system includes a coolant channel network. The coolant channels in the coolant channel network are distributed in the shell of the spindle body, the front bearing seat and the rear bearing seat and are respectively connected to the machine tool coolant input interface and the machine tool coolant return interface. According to the record in paragraph 0081 of the patent document specification, when the spindle cooling system is working, the coolant first passes through the coolant channel in the front bearing seat, then passes through the coolant channel in the spindle body (the coolant channel in the spindle body has multiple axial channels opened along the axial direction of the spindle body), and finally passes through the coolant channel in the rear bearing seat; that is, the spindle cooling system adopts a "front-middle-rear" cooling scheme.

[0003] After that, the applicant provided a machine tool spindle in the patent document with application number 202311546879.5. In order to improve the cooling effect of the motor stator, which is the main heat source during the operation of the machine tool spindle, the coolant channel in the spindle body was improved. By adding an intermediate sleeve between the inner wall of the spindle body and the outer wall of the motor stator, a coolant flow path covering the outside of the motor stator is formed, which can cool the motor stator more effectively. In addition, according to the description of the patent document, when the spindle cooling system is working, the coolant first passes through the coolant channel in the rear bearing seat, then passes through the coolant channel in the spindle body, and finally passes through the coolant channel in the front bearing seat; that is, the spindle cooling system adopts a "back-middle-front" cooling scheme.

[0004] The inventor found that when the above-mentioned "front-middle-back" cooling scheme is adopted, the coolant first passes through the front bearing seat, at which time the coolant temperature is the lowest and the cooling effect is the best. However, the main heat source when the machine tool spindle is running, that is, the motor stator, has significantly increased in temperature after the coolant cools the spindle body. The cooling effect of cooling the rear bearing seat thereafter is very poor, which easily leads to heat accumulation in the rear bearing seat. When the above-mentioned "back-middle-front" cooling scheme is adopted, that is, the coolant first passes through the rear bearing seat, at which time the cooling effect is the best. After the coolant cools the spindle body, the temperature has significantly increased. The cooling effect of cooling the front bearing seat thereafter is very poor, which easily leads to heat accumulation in the front bearing seat. Summary of the invention

[0005] The purpose of the present invention is to provide a machine tool spindle and a front bearing seat of the machine tool spindle, so as to solve the technical problems that heat accumulation in the rear bearing seat occurs when the above-mentioned "front-middle-rear" cooling scheme is adopted, and heat accumulation in the front bearing seat occurs when the above-mentioned "rear-middle-front" cooling scheme is adopted.

[0006] In the first aspect, a machine tool spindle is provided, comprising: a spindle body; a spindle motor, the spindle motor comprising a motor stator and a motor rotor, the motor stator being fixed in the spindle body, the motor rotor being adapted to the motor stator; a shaft core, the shaft core being rotatably mounted in the spindle body through a front bearing system and a rear bearing system and rotating with the motor rotor, a tool holder assembly structure being provided at the front end of the shaft core; a front bearing system, the front bearing system comprising a front bearing seat and a front bearing, the front bearing seat being arranged at the front end of the spindle body, the front bearing being installed in the front bearing seat and rotatably supporting the front part of the shaft core; a rear bearing system, the rear bearing system comprising a rear bearing seat and a rear bearing, the rear bearing seat being arranged at the rear end of the spindle body, the rear bearing being installed in the front bearing seat and rotatably supporting the front part of the shaft core. Installed in the rear bearing seat and rotatably supporting the rear part of the shaft core; a tool holder locking and releasing mechanism, the tool holder locking and releasing mechanism includes an actuator and a driving mechanism, when the driving mechanism operates in a first driving mode, the actuator can lock the tool holder so that the tool holder and the tool holder assembly structure are closely matched, when the driving mechanism operates in a second driving mode, the actuator releases the tool holder so that the tool holder can be detached from the tool holder assembly structure; a spindle cooling system, the spindle cooling system includes a coolant channel network, the coolant channels in the coolant channel network are distributed in the shells of the spindle body, the front bearing seat and the rear bearing seat and are respectively connected to the machine tool coolant input interface and the machine tool coolant return interface; the coolant channel network The cooling liquid channel distributed in the shell layer of the rear bearing seat includes an annular cooling channel of the rear bearing seat, and an annular cooling channel of the rear bearing seat is provided with a cooling liquid inlet of the annular cooling channel of the rear bearing seat and a cooling liquid outlet of the annular cooling channel of the rear bearing seat; the cooling liquid channel distributed in the shell layer of the spindle body in the cooling liquid channel network includes an annular cooling channel of the spindle body and an axial guide channel of the spindle body, and an annular cooling channel of the spindle body is provided with a cooling liquid inlet of the annular cooling channel of the spindle body and a cooling liquid outlet of the annular cooling channel of the spindle body, and the axial guide channel of the spindle body is provided with a cooling liquid inlet of the axial guide channel of the spindle body and a cooling liquid outlet of the axial guide channel of the spindle body; the shell layer of the front bearing seat distributed in the cooling liquid channel network includes an annular cooling channel of the spindle body and an axial guide channel of the spindle body The coolant channel in the layer includes a front bearing seat annular cooling channel, and a front bearing seat annular cooling channel coolant inlet and a front bearing seat annular cooling channel coolant outlet are distributed on the front bearing seat annular cooling channel; wherein, the coolant inlet of the rear bearing seat annular cooling channel is connected to the machine tool coolant input interface, the coolant outlet of the rear bearing seat annular cooling channel is connected to the coolant inlet of the spindle body axial guide channel, the coolant outlet of the spindle body axial guide channel is connected to the coolant inlet of the front bearing seat annular cooling channel, the coolant outlet of the front bearing seat annular cooling channel is connected to the coolant inlet of the spindle body annular cooling channel, and the coolant outlet of the spindle body annular cooling channel is connected to the machine tool coolant reflux interface;When the spindle cooling system is working, the coolant flows among the annular cooling channel of the rear bearing seat, the annular cooling channel of the spindle body, and the annular cooling channel of the front bearing seat in the order of first passing through the annular cooling channel of the rear bearing seat, then passing through the annular cooling channel of the front bearing seat, and finally passing through the annular cooling channel of the spindle body. ;

[0007] As an improvement and / or instantiation of the machine tool spindle of the first aspect mentioned above, further: the annular cooling channel of the rear bearing seat includes an annular groove on the outer wall of the rear bearing seat which is circumferentially arranged on the outer wall of the rear bearing seat and matches the inner wall of the spindle body.

[0008] As an improvement and / or instantiation of the machine tool spindle of the first aspect mentioned above, further: the annular cooling channel of the spindle body includes a plurality of intermediate sleeve outer wall annular grooves arranged evenly in the axial direction on the outer wall of the intermediate sleeve arranged between the inner wall of the spindle body and the outer wall of the motor stator, and the outer wall of the intermediate sleeve is provided with a plurality of convex rings arranged evenly in the axial direction so that an intermediate sleeve outer wall annular groove is formed between any two adjacent convex rings, each of the plurality of convex rings is provided with a recess, and the recesses of any two adjacent convex rings differ by 180° in the circumferential direction, and the A plurality of convex rings are respectively matched with the inner side wall of the main shaft body, and a recess is provided on each of the plurality of convex rings so that any two adjacent annular grooves on the outer side wall of the intermediate sleeves are connected through the corresponding recess; the coolant inlet of the annular cooling channel of the main shaft body is connected with the annular groove on the outer side wall of the intermediate sleeve at the front end of the intermediate sleeve and is 180° different from the recess on the convex ring at the front end of the intermediate sleeve in the circumferential direction; the coolant outlet of the annular cooling channel of the main shaft body is connected with the annular groove on the outer side wall of the intermediate sleeve at the rear end of the intermediate sleeve and is 180° different from the recess on the convex ring at the rear end of the intermediate sleeve in the circumferential direction.

[0009] As an improvement and / or instantiation of the machine tool spindle of the first aspect mentioned above, further: the annular cooling channel of the spindle body includes a spiral groove on the outer wall of the intermediate sleeve opened on the outer wall of the intermediate sleeve arranged between the inner wall of the spindle body and the outer wall of the motor stator, the coolant inlet of the annular cooling channel of the spindle body is arranged at the front end of the spiral groove on the outer wall of the intermediate sleeve, and the coolant outlet of the annular cooling channel of the spindle body is arranged at the rear end of the spiral groove on the outer wall of the intermediate sleeve.

[0010] As an improvement and / or instantiation of the machine tool spindle of the first aspect mentioned above, further: the spindle body axial guide channel is formed by a spindle body axial guide hole opened in the spindle body; the coolant inlet of the spindle body axial guide channel is arranged at the rear end of the spindle body axial guide hole, and the coolant outlet of the spindle body axial guide channel is arranged at the front end of the spindle body axial guide hole.

[0011] As an improvement and / or instantiation of the machine tool spindle of the first aspect mentioned above, further: the number of the axial flow guide holes of the spindle body is two and the two axial flow guide holes of the spindle body are arranged close to each other.

[0012] As an improvement and / or instantiation of the machine tool spindle of the first aspect mentioned above, further: the front bearing seat has a front bearing seat body and a ring-shaped part mounted on the inner side of the front bearing seat body, and the annular cooling channel of the front bearing seat includes an annular groove on the inner wall of the front bearing seat body arranged circumferentially on the inner wall of the front bearing seat body.

[0013] As an improvement and / or instantiation of the machine tool spindle of the first aspect mentioned above, further: a front end mounting flange of the spindle body is provided in the middle area of ​​the outer side surface of the front bearing seat body, and a plurality of bolt axial mounting holes are circumferentially distributed on the front end mounting flange of the spindle body, and the front end of the spindle body cooperates with the front end mounting flange of the spindle body and is connected together by bolts inserted into these bolt axial mounting holes; the front bearing seat annular cooling channel also includes an annular groove on the outer side wall of the front bearing seat body circumferentially arranged at a position on the outer side wall of the front bearing seat body that cooperates with the inner side wall of the spindle body; an internal channel of the front bearing seat body is opened in the front bearing seat body to connect the annular groove on the inner side wall of the front bearing seat body with the annular groove on the outer side wall of the front bearing seat body; the coolant inlet of the front bearing seat annular cooling channel is arranged on the annular groove on the inner side wall of the front bearing seat body, and the coolant outlet of the front bearing seat annular cooling channel is arranged on the annular groove on the outer side wall of the front bearing seat body.

[0014] As an improvement and / or instantiation of the machine tool spindle of the first aspect mentioned above, further: an arc-shaped collecting groove is provided at the bottom of the annular groove on the inner side wall of the front bearing seat body, and two coolant inlet holes arranged in parallel are opened at the bottom of the arc-shaped collecting groove, and the two coolant inlet holes respectively form the coolant inlet of the annular cooling channel of the front bearing seat; the spindle body axial guide channel is formed by the spindle body axial guide hole opened in the spindle body; the coolant inlet of the spindle body axial guide channel is arranged at the rear end of the spindle body axial guide hole, and the coolant outlet of the spindle body axial guide channel is arranged at the front end of the spindle body axial guide hole; the number of the spindle body axial guide holes is two and the two spindle body axial guide holes are arranged close to each other; the two coolant inlet holes correspond one-to-one to the two spindle body axial guide holes.

[0015] As an improvement and / or instantiation of the machine tool spindle of the first aspect mentioned above, further: the coolant channels in the coolant channel network distributed in the shell layer of the spindle body also include an axial output channel of the spindle body, and the coolant outlet of the annular cooling channel of the spindle body is connected to the machine tool coolant reflux interface through the axial output channel of the spindle body.

[0016] In a second aspect, a front bearing seat of a machine tool spindle is provided, comprising a front bearing seat body and a front bearing seat annular cooling channel arranged on the front bearing seat body, a spindle body front end mounting flange is arranged in the middle area of ​​the outer side surface of the front bearing seat body, a front bearing seat annular cooling channel coolant inlet and a front bearing seat annular cooling channel coolant outlet are distributed on the front bearing seat annular cooling channel, the front bearing seat annular cooling channel is included in a front bearing seat body inner side wall annular groove circumferentially arranged on the inner side wall of the front bearing seat body, the front bearing seat annular cooling channel coolant inlet is arranged on the front bearing seat body inner side wall annular groove, the front bearing seat annular cooling channel also includes a front bearing seat body outer side wall annular groove located on the outer side wall of the front bearing seat body and circumferentially arranged, the front bearing seat annular cooling channel coolant outlet is arranged on the front bearing seat body outer side wall annular groove, and a front bearing seat body internal channel is opened in the front bearing seat body to connect the front bearing seat body inner side wall annular groove with the front bearing seat body outer side wall annular groove.

[0017] As an improvement and / or instantiation of the front bearing seat of the machine tool spindle of the second aspect mentioned above, further: an arc-shaped collecting groove is provided at the bottom of the annular groove on the inner side wall of the front bearing seat body, and two coolant inlet holes arranged in parallel are opened at the bottom of the arc-shaped collecting groove, and the two coolant inlet holes respectively form the coolant inlet of the annular cooling channel of the front bearing seat.

[0018] As an improvement and / or instantiation of the front bearing seat of the machine tool spindle in the above second aspect, further: a plurality of axial bolt mounting holes are circumferentially distributed on the front end mounting flange of the spindle body.

[0019] The machine tool spindle of the first aspect above adopts a "back-front-middle" cooling scheme (that is, when the spindle cooling system is working, the coolant flows between the annular cooling channel of the rear bearing seat, the annular cooling channel of the spindle body, and the annular cooling channel of the front bearing seat in the order of first passing through the annular cooling channel of the rear bearing seat, then passing through the annular cooling channel of the front bearing seat, and finally passing through the annular cooling channel of the spindle body), which effectively solves the shortcomings of the previous two schemes and optimizes the overall cooling effect. First, the rear bearing seat is cooled to avoid heat accumulation in the rear; then the front bearing seat is cooled to ensure the accuracy of the front end of the spindle; since the heat generated by the rear bearing seat and the front bearing seat is much smaller than that of the spindle body, the spindle body (including the motor stator) is cooled last, and a coolant with a moderate temperature can be used for more uniform cooling. This sequence not only balances the heat distribution and improves the thermal gradient, but also optimizes the cooling effect on the main heat source (motor stator). Through more balanced temperature control, it helps to maintain the high-precision operation of the spindle and improve the efficiency of the entire cooling system.

[0020] The front bearing seat of the machine tool spindle of the second aspect is specially designed for the machine tool spindle of the first aspect, and can realize the conversion of coolant from the annular cooling channel of the front bearing seat to the annular cooling channel of the spindle body.

[0021] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments. Additional aspects and advantages of the present invention will be partially given in the following description, partially become apparent from the following description, or be learned through practice. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings constituting a part of this specification are used to assist the understanding of the present invention. The contents provided in the drawings and the related descriptions in this specification can be used to explain the present invention, but do not constitute improper limitations on the present invention.

[0023] Figure 1 The present invention is a cross-sectional view of a machine tool spindle on a first cross-sectional plane according to an embodiment of the present invention.

[0024] Figure 2 for Figure 1 A sectional view of the machine tool spindle is shown on a second section plane.

[0025] Figure 3 for Figure 1 A sectional view of the machine tool spindle shown on the third section plane.

[0026] The first section, the second section and the third section all pass through the central axis of the machine tool spindle and there is a certain angle between the first section, the second section and the third section.

[0027] Figure 4 for Figure 1 An enlarged view of the front end of the machine tool spindle is shown.

[0028] Figure 5 for Figure 1 The cross-sectional view of the spindle cooling system of the machine tool spindle shown in the figure (the cross-sectional view corresponds to Figure 1 ).

[0029] Figure 6 for Figure 1 The cross-sectional view of the spindle cooling system of the machine tool spindle shown in the figure (the cross-sectional view corresponds to Figure 2 ).

[0030] Figure 7 for Figure 1 A three-dimensional image of the front bearing housing body of the machine tool spindle is shown.

[0031] Figure 8 for Figure 1 A three-dimensional image of the front bearing housing body of the machine tool spindle is shown.

[0032] Fig. 9 for Figure 1 A partial cross-sectional view of the front bearing housing body of the machine tool spindle is shown.

[0033] Fig.10 for Figure 1 Actual photo of the machine tool spindle shown.

[0034] Fig.11 for Figure 1 Actual photo of the front bearing housing body of the machine tool spindle shown. DETAILED DESCRIPTION

[0035] The present invention is described clearly and completely below in conjunction with the accompanying drawings. A person skilled in the art will be able to implement the present invention based on these descriptions. Before describing the present invention in conjunction with the accompanying drawings, it should be particularly noted that:

[0036] The technical solutions and technical features provided in each section, including the following description, can be combined with each other without conflict. In addition, where possible, these technical solutions, technical features and related combinations can be assigned specific technical themes and protected by relevant patents.

[0037] The embodiments of the present invention involved in the following description are generally only a part of the embodiments rather than all the embodiments. Based on these embodiments, all other embodiments obtained by ordinary technicians in this field without making creative work should fall within the scope of patent protection.

[0038] Regarding the terms and units in this specification: The terms "include", "comprises", "have" and any variations thereof in this specification and the corresponding claims and related parts are intended to cover non-exclusive inclusions. In addition, other relevant terms and units can be reasonably interpreted based on the relevant content provided in this specification.

[0039] like Figure 1-Figure 9As shown, a machine tool spindle comprises: a spindle body 1; a spindle motor, the spindle motor comprises a motor stator and a motor rotor, the motor stator is fixed in the spindle body 1, and the motor rotor is adapted to the motor stator; a shaft core 3, the shaft core 3 is rotatably installed in the spindle body 1 through a front bearing system 4 and a rear bearing system 5 and rotates with the motor rotor, and a tool handle assembly structure is provided at the front end of the shaft core 3; a front bearing system 4, the front bearing system comprises a front bearing seat and a front bearing, the front bearing seat is arranged at the front end of the spindle body, the front bearing is installed in the front bearing seat and rotatably supports the front part of the shaft core; a rear bearing system 5. The rear bearing system includes a rear bearing seat and a rear bearing, wherein the rear bearing seat is arranged at the rear end of the spindle body, and the rear bearing is installed in the rear bearing seat and rotatably supports the rear part of the shaft core; a tool handle locking and releasing mechanism 6, wherein the tool handle locking and releasing mechanism 6 includes an actuator and a driving mechanism, wherein when the driving mechanism operates in a first driving mode, the actuator can lock the tool handle so that the tool handle and the tool handle assembly structure are closely matched, and when the driving mechanism operates in a second driving mode, the actuator releases the tool handle so that the tool handle can be detached from the tool handle assembly structure; a spindle cooling system 7, wherein the spindle cooling system 7 includes a cooling A cooling liquid channel network, wherein the cooling liquid channels in the cooling liquid channel network are distributed in the shell layers of the spindle body 1, the front bearing seat and the rear bearing seat and are respectively connected to the machine tool coolant input interface 7a and the machine tool coolant return interface 7b; the cooling liquid channels in the cooling liquid channel network distributed in the shell layer of the rear bearing seat include a rear bearing seat annular cooling channel 71, and the rear bearing seat annular cooling channel 71 is provided with a rear bearing seat annular cooling channel coolant inlet and a rear bearing seat annular cooling channel coolant outlet; the cooling liquid channels in the cooling liquid channel network distributed in the shell layer of the spindle body 1 include the spindle body The main body annular cooling channel 72 and the main body axial guide channel 73 are provided with a main body annular cooling channel coolant inlet and a main body annular cooling channel coolant outlet, and the main body axial guide channel is provided with a main body axial guide channel coolant inlet and a main body axial guide channel coolant outlet; the coolant channel distributed in the shell layer of the front bearing seat in the coolant channel network includes a front bearing seat annular cooling channel 74, and the front bearing seat annular cooling channel 74 is provided with a front bearing seat annular cooling channel coolant inlet and a front bearing seat annular cooling channel coolant outlet;Among them, the coolant inlet of the annular cooling channel of the rear bearing seat is connected to the coolant input interface of the machine tool, the coolant outlet of the annular cooling channel of the rear bearing seat is connected to the coolant inlet of the axial guide channel of the spindle body, the coolant outlet of the axial guide channel of the spindle body is connected to the coolant inlet of the annular cooling channel of the front bearing seat, the coolant outlet of the annular cooling channel of the front bearing seat is connected to the coolant inlet of the annular cooling channel of the spindle body, and the coolant outlet of the annular cooling channel of the spindle body is connected to the coolant return interface of the machine tool; when the spindle cooling system is working, the coolant flows among the annular cooling channel 71 of the rear bearing seat, the annular cooling channel 72 of the spindle body and the annular cooling channel 74 of the front bearing seat in the order of first passing through the annular cooling channel 71 of the rear bearing seat, then passing through the annular cooling channel 74 of the front bearing seat, and finally passing through the annular cooling channel 72 of the spindle body. ;

[0040] The above-mentioned machine tool spindle adopts a "back-front-middle" cooling scheme (that is, when the spindle cooling system 7 is working, the coolant flows between the rear bearing seat annular cooling channel 71, the spindle body annular cooling channel 72 and the front bearing seat annular cooling channel 74 in the order of first passing through the rear bearing seat annular cooling channel 71, then passing through the front bearing seat annular cooling channel 74, and finally passing through the spindle body annular cooling channel 72), which effectively solves the shortcomings of the previous two schemes and optimizes the overall cooling effect. First, the rear bearing seat is cooled to avoid heat accumulation in the rear; then the front bearing seat is cooled to ensure the accuracy of the front end of the spindle; because the heat generated by the rear bearing seat and the front bearing seat is much smaller than that of the spindle body, the spindle body 1 (including the motor stator) is cooled last, and a coolant with a moderate temperature can be used for more uniform cooling. This sequence not only balances the heat distribution and improves the thermal gradient, but also optimizes the cooling effect on the main heat source (motor stator). This helps maintain high-precision operation of the spindle through more balanced temperature control, while improving the efficiency of the entire cooling system.

[0041] The annular cooling channel 71 of the rear bearing seat comprises an annular groove on the outer wall of the rear bearing seat which is circumferentially arranged on the outer wall of the rear bearing seat and matches with the inner wall of the main shaft body 1 .

[0042] Among them, the annular cooling channel 72 of the main shaft body can adopt the solution provided by the applicant in the patent document with application number 202311546879.5, that is, the annular cooling channel 72 of the main shaft body includes a plurality of annular grooves of the outer wall of the intermediate sleeve 11 arranged on the outer wall between the inner wall of the main shaft body 1 and the outer wall of the motor stator, which are arranged evenly spaced along the axial direction, and a plurality of convex rings evenly spaced along the axial direction are arranged on the outer wall of the intermediate sleeve, so that an annular groove of the outer wall of the intermediate sleeve is formed between any two adjacent convex rings, and each of the plurality of convex rings is provided with a recess, and the recesses of any two adjacent convex rings are circumferentially spaced apart. The plurality of convex rings are respectively matched with the inner side wall of the main shaft body, and a recess is provided on each of the plurality of convex rings so that any two adjacent annular grooves on the outer side wall of the intermediate sleeves are connected through the corresponding recess; the coolant inlet of the annular cooling channel of the main shaft body is connected with the annular groove on the outer side wall of the intermediate sleeve at the front end of the intermediate sleeve and is 180° different from the recess on the front end of the convex ring of the intermediate sleeve in the circumferential direction; the coolant outlet of the annular cooling channel of the main shaft body is connected with the annular groove on the outer side wall of the intermediate sleeve at the rear end of the intermediate sleeve and is 180° different from the recess on the convex ring at the rear end of the intermediate sleeve in the circumferential direction.

[0043] In another specific embodiment, the spindle body annular cooling channel 72 may include an intermediate sleeve outer wall spiral groove opened on the outer wall of the intermediate sleeve 11 sleeved between the inner wall of the spindle body 1 and the outer wall of the motor stator, the coolant inlet of the spindle body annular cooling channel is arranged at the front end of the spiral groove of the intermediate sleeve outer wall, and the coolant outlet of the spindle body annular cooling channel is arranged at the rear end of the spiral groove of the intermediate sleeve outer wall.

[0044] Among them, the spindle body axial guide channel 73 is formed by a spindle body axial guide hole opened in the spindle body; the coolant inlet of the spindle body axial guide channel is arranged at the rear end of the spindle body axial guide hole, and the coolant outlet of the spindle body axial guide channel is arranged at the front end of the spindle body axial guide hole.

[0045] Specifically, the number of the main shaft body axial flow guide holes can be two and the two main shaft body axial flow guide holes are arranged close to each other. Since the number of the main shaft body axial flow guide holes is small (two), it is helpful to improve the strength of the main shaft body 1.

[0046] Among them, the front bearing seat has a front bearing seat body 41 and a ring part 42 which is cooperatively installed on the inner side surface of the front bearing seat body 41, and the front bearing seat annular cooling channel 74 includes an annular groove 741 on the inner side wall of the front bearing seat body which is circumferentially arranged on the inner side wall of the front bearing seat body 41. In addition, a main shaft body front end mounting flange 43 is provided in the middle area of ​​the outer side surface of the front bearing seat body 41, and a plurality of bolt axial mounting holes are circumferentially distributed on the main shaft body front end mounting flange 43, and the front end of the main shaft body 1 cooperates with the main shaft body front end mounting flange 43 and is connected together by bolts 44 inserted into these bolt axial mounting holes; the front bearing seat annular cooling channel 74 also includes a front bearing seat body outer side wall annular groove 742 circumferentially arranged at a position on the outer side wall of the front bearing seat body 41 that cooperates with the inner side wall of the main shaft body 1; a front bearing seat body internal channel that connects the front bearing seat body inner side wall annular groove 741 with the front bearing seat body outer side wall annular groove 742 is opened in the front bearing seat body 41; the front bearing seat annular cooling channel coolant inlet is arranged on the front bearing seat body inner side wall annular groove 741, and the front bearing seat annular cooling channel coolant outlet is arranged on the front bearing seat body outer side wall annular groove 742.

[0047] The advantages of this design are mainly as follows: First, the annular groove structure of the inner and outer walls of the front bearing seat body 41 (the annular groove 741 on the inner wall of the front bearing seat body and the annular groove 742 on the outer wall of the front bearing seat body) and the internal channel of the front bearing seat body form an efficient cooling circuit, which can fully cover the front bearing seat area to ensure uniform cooling. Secondly, the front end mounting flange 43 of the spindle body and the bolt connection method firmly and reliably fit the front bearing seat body 41 and the spindle body 1 together, and the annular groove 741 on the inner wall of the front bearing seat body and the annular groove 742 on the outer wall of the front bearing seat body are just located on both sides of the front end mounting flange 43 of the spindle body. This makes it easy to pass the front bearing seat annular cooling channel 74 through the channel opened in the spindle body 1 (see Figure 6 ) and transitions to the annular cooling channel 72 of the spindle body. It can be seen that this structural design not only optimizes the cooling effect, but also takes into account the assembly convenience and structural stability.

[0048] Among them, an arc-shaped collecting groove 743 is provided at the bottom of the annular groove 741 on the inner side wall of the front bearing seat body, and two coolant inlet holes arranged in parallel are opened at the bottom of the arc-shaped collecting groove 743, and the two coolant inlet holes respectively form the coolant inlet of the annular cooling channel of the front bearing seat; the spindle body axial guide channel 73 is formed by the spindle body axial guide hole opened in the spindle body 1; the coolant inlet of the spindle body axial guide channel is arranged at the rear end of the spindle body axial guide hole, and the coolant outlet of the spindle body axial guide channel is arranged at the front end of the spindle body axial guide hole; the number of the spindle body axial guide holes is two and the two spindle body axial guide holes are arranged close to each other; the two coolant inlet holes correspond to the two spindle body axial guide holes one by one.

[0049] The arc-shaped collecting groove 743 can effectively collect and distribute the coolant. The design of two parallel coolant inlet holes corresponding to the two spindle body axial guide holes ensures the uniform distribution and flow of the coolant, and then uses the guiding effect of the arc-shaped collecting groove 743 to flow in two different directions to quickly cool the front bearing seat. The number of spindle body axial guide holes is limited to two and they are set close together, which ensures sufficient cooling effect while retaining the structural strength of the spindle body 1 to the maximum extent.

[0050] Among them, the coolant channels distributed in the shell layer of the spindle body in the coolant channel network also include an axial output channel of the spindle body, and the coolant outlet of the spindle body annular cooling channel and the machine tool coolant reflux interface are connected through the axial output channel of the spindle body.

[0051] The above is a description of the relevant contents of the present invention. A person skilled in the art will be able to implement the present invention based on these descriptions. Based on the above contents of this specification, all other embodiments obtained by a person skilled in the art without making any creative work shall fall within the scope of patent protection.

Claims

1. Machine tool spindle, including: Spindle body; A spindle motor, the spindle motor comprising a motor stator and a motor rotor, the motor stator being fixed in the spindle body, and the motor rotor being adapted to the motor stator; A shaft core, the shaft core is rotatably mounted in the spindle body through a front bearing system and a rear bearing system and rotates with the motor rotor, and a tool handle assembly structure is provided at the front end of the shaft core; A front bearing system, the front bearing system comprising a front bearing seat and a front bearing, the front bearing seat being arranged at the front end of the main shaft body, the front bearing being installed in the front bearing seat and rotatably supporting the front part of the shaft core; A rear bearing system, the rear bearing system comprising a rear bearing seat and a rear bearing, the rear bearing seat being arranged at the rear end of the main shaft body, the rear bearing being installed in the rear bearing seat and rotatably supporting the rear part of the shaft core; A knife handle locking and releasing mechanism, wherein the knife handle locking and releasing mechanism comprises an actuator and a driving mechanism, wherein when the driving mechanism operates in a first driving mode, the actuator can lock the knife handle so that the knife handle and the knife handle assembly structure are closely matched, and when the driving mechanism operates in a second driving mode, the actuator releases the knife handle so that the knife handle can be separated from the knife handle assembly structure; A spindle cooling system, the spindle cooling system comprising a coolant channel network, the coolant channels in the coolant channel network are distributed in the spindle body, the front bearing seat and the shell layer of the rear bearing seat and are respectively connected to the machine tool coolant input interface and the machine tool coolant return interface; Features: The coolant channel in the coolant channel network distributed in the shell layer of the rear bearing seat includes a rear bearing seat annular cooling channel, and the rear bearing seat annular cooling channel is provided with a rear bearing seat annular cooling channel coolant inlet and a rear bearing seat annular cooling channel coolant outlet; The coolant channels in the coolant channel network distributed in the shell layer of the spindle body include a spindle body annular cooling channel and a spindle body axial guide channel, the spindle body annular cooling channel is provided with a spindle body annular cooling channel coolant inlet and a spindle body annular cooling channel coolant outlet, and the spindle body axial guide channel is provided with a spindle body axial guide channel coolant inlet and a spindle body axial guide channel coolant outlet; The coolant channel in the coolant channel network distributed in the shell layer of the front bearing seat includes a front bearing seat annular cooling channel, and the front bearing seat annular cooling channel is provided with a front bearing seat annular cooling channel coolant inlet and a front bearing seat annular cooling channel coolant outlet; Wherein, the coolant inlet of the annular cooling channel of the rear bearing seat is connected to the coolant input interface of the machine tool, the coolant outlet of the annular cooling channel of the rear bearing seat is connected to the coolant inlet of the axial guide channel of the spindle body, the coolant outlet of the axial guide channel of the spindle body is connected to the coolant inlet of the annular cooling channel of the front bearing seat, the coolant outlet of the annular cooling channel of the front bearing seat is connected to the coolant inlet of the annular cooling channel of the spindle body, and the coolant outlet of the annular cooling channel of the spindle body is connected to the coolant reflux interface of the machine tool; When the spindle cooling system is working, the coolant flows among the annular cooling channel of the rear bearing seat, the annular cooling channel of the spindle body and the annular cooling channel of the front bearing seat in the order of first passing through the annular cooling channel of the rear bearing seat, then passing through the annular cooling channel of the front bearing seat, and finally passing through the annular cooling channel of the spindle body.

2. The machine tool spindle according to claim 1, characterized in that: The annular cooling channel of the rear bearing seat comprises an annular groove of the outer wall of the rear bearing seat which is circumferentially arranged on the outer wall of the rear bearing seat and matches with the inner wall of the main shaft body.

3. The machine tool spindle according to claim 1, characterized in that: The annular cooling channel of the main shaft body includes a plurality of annular grooves on the outer side wall of the intermediate sleeve arranged evenly at intervals in the axial direction, which are opened on the outer side wall of the intermediate sleeve between the inner side wall of the main shaft body and the outer side wall of the motor stator. A plurality of convex rings arranged evenly at intervals in the axial direction are arranged on the outer side wall of the intermediate sleeve so that an annular groove on the outer side wall of the intermediate sleeve is formed between any two adjacent convex rings. A recess is opened on each of the plurality of convex rings. The recesses of any two adjacent convex rings differ by 180° in the circumferential direction. The plurality of convex rings are respectively disposed on the inner side wall of the main shaft body. The walls are adapted, and a recess provided on each of the multiple convex rings enables communication between any two adjacent annular grooves on the outer side walls of the intermediate sleeves through the corresponding recess; the coolant inlet of the annular cooling channel of the main shaft body is connected to the annular groove on the outer side wall of the intermediate sleeve at the front end of the intermediate sleeve and is 180° different from the recess on the convex ring at the front end of the intermediate sleeve in the circumferential direction; the coolant outlet of the annular cooling channel of the main shaft body is connected to the annular groove on the outer side wall of the intermediate sleeve at the rear end of the intermediate sleeve and is 180° different from the recess on the convex ring at the rear end of the intermediate sleeve in the circumferential direction.

4. The machine tool spindle according to claim 1, characterized in that: The annular cooling channel of the main shaft body includes a spiral groove on the outer wall of the intermediate sleeve opened on the outer wall of the intermediate sleeve arranged between the inner wall of the main shaft body and the outer wall of the motor stator. The coolant inlet of the annular cooling channel of the main shaft body is arranged at the front end of the spiral groove on the outer wall of the intermediate sleeve, and the coolant outlet of the annular cooling channel of the main shaft body is arranged at the rear end of the spiral groove on the outer wall of the intermediate sleeve.

5. The machine tool spindle according to claim 3 or 4, characterized in that: The spindle body axial guide channel is formed by a spindle body axial guide hole opened in the spindle body; the coolant inlet of the spindle body axial guide channel is arranged at the rear end of the spindle body axial guide hole, and the coolant outlet of the spindle body axial guide channel is arranged at the front end of the spindle body axial guide hole.

6. The machine tool spindle according to claim 5, characterized in that: The number of the main shaft body axial flow guide holes is two, and the two main shaft body axial flow guide holes are arranged close to each other.

7. The machine tool spindle according to claim 1, characterized in that: The front bearing seat comprises a front bearing seat body and an annular member mounted on the inner side of the front bearing seat body, and the annular cooling channel of the front bearing seat comprises an annular groove on the inner side wall of the front bearing seat body which is circumferentially arranged on the inner side wall of the front bearing seat body.

8. The machine tool spindle according to claim 7, characterized in that: A main shaft body front end mounting flange is provided in the middle area of ​​the outer side surface of the front bearing seat body, and a plurality of bolt axial mounting holes are circumferentially distributed on the front end mounting flange of the main shaft body, and the front end of the main shaft body cooperates with the front end mounting flange of the main shaft body and is connected together by bolts inserted into these bolt axial mounting holes; the front bearing seat annular cooling channel also includes a front bearing seat body outer side wall annular groove circumferentially arranged at a position on the outer side wall of the front bearing seat body that cooperates with the inner side wall of the main shaft body; a front bearing seat body internal channel that connects the front bearing seat body inner side wall annular groove with the front bearing seat body outer side wall annular groove is opened in the front bearing seat body; the front bearing seat annular cooling channel coolant inlet is arranged on the front bearing seat body inner side wall annular groove, and the front bearing seat annular cooling channel coolant outlet is arranged on the front bearing seat body outer side wall annular groove.

9. The machine tool spindle according to claim 7, characterized in that: An arc-shaped collecting groove is provided at the bottom of the annular groove on the inner side wall of the front bearing seat body, and two coolant inlet holes arranged in parallel are opened at the bottom of the arc-shaped collecting groove, and the two coolant inlet holes respectively form the coolant inlet of the annular cooling channel of the front bearing seat; the spindle body axial guide channel is formed by the spindle body axial guide hole opened in the spindle body; the coolant inlet of the spindle body axial guide channel is arranged at the rear end of the spindle body axial guide hole, and the coolant outlet of the spindle body axial guide channel is arranged at the front end of the spindle body axial guide hole; the number of the spindle body axial guide holes is two and the two spindle body axial guide holes are arranged close to each other; the two coolant inlet holes correspond to the two spindle body axial guide holes one by one.

10. The machine tool spindle according to claim 1, characterized in that: The coolant channels in the coolant channel network distributed in the shell layer of the spindle body also include a spindle body axial output channel, and the coolant outlet of the spindle body annular cooling channel and the machine tool coolant return interface are connected through the spindle body axial output channel.

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