Front bearing seat of machine tool spindle

Abstract

The utility model discloses a front bearing seat of a machine tool spindle, which comprises a front bearing seat body and a front bearing seat annular cooling channel arranged on the front bearing seat body, and a spindle body front end mounting flange is arranged in the middle area of the outer side face of the front bearing seat body. The front bearing seat annular cooling channel comprises a front bearing seat body inner side wall annular groove formed in the inner side wall of the front bearing seat body in the circumferential direction, and a cooling liquid inlet of the front bearing seat annular cooling channel is formed in the front bearing seat body inner side wall annular groove. The front bearing seat annular cooling channel further comprises a front bearing seat body outer side wall annular groove which is formed in the outer side wall of the front bearing seat body and located behind the main shaft body front end installation flange in the circumferential direction, and a cooling liquid outlet of the front bearing seat annular cooling channel is formed in the front bearing seat body outer side wall annular groove. And a front bearing seat body internal channel for communicating the front bearing seat body inner side wall annular groove with the front bearing seat body outer side wall annular groove is formed in the front bearing seat body.

Description

TECHNICAL FIELD

[0001] The utility model relates to lathe spindle and lathe spindle's front bearing seat. BACKGROUND

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

[0003] Thereafter, the applicant provides a lathe spindle in the patent document with application number 202311546879.5. To improve the cooling effect on the main heat source, i.e., the motor stator, during the operation of the lathe spindle, the cooling liquid channels in the spindle body are improved. An intermediate sleeve is added between the inner side wall of the spindle body and the outer side wall of the motor stator to form a cooling liquid flow path that covers the outer side of the motor stator, which can more effectively cool the motor stator. In addition, according to the record in the specification of the patent document, when the spindle cooling system is working, the cooling liquid first passes through the cooling liquid channels in the rear bearing seat, then passes through the cooling liquid channels in the spindle body, and finally passes through the cooling liquid channels in the front bearing seat; that is, the spindle cooling system adopts a "rear-middle-front" cooling scheme.

[0004] The inventor finds that when the above-mentioned "front-middle-rear" cooling scheme is adopted, the cooling liquid first passes through the front bearing seat, at which time the cooling effect is the best, while the main heat source, i.e., the motor stator, during the operation of the lathe spindle, has already significantly increased in temperature after the spindle body is cooled by the cooling liquid, and the cooling effect is poor when the rear bearing seat is cooled thereafter, which easily leads to heat accumulation in the rear bearing seat. When the above-mentioned "rear-middle-front" cooling scheme is adopted, i.e., the cooling liquid first passes through the rear bearing seat, at which time the cooling effect is the best, while the main heat source, i.e., the motor stator, during the operation of the lathe spindle, has already significantly increased in temperature after the spindle body is cooled by the cooling liquid, and the cooling effect is poor when the front bearing seat is cooled thereafter, which easily leads to heat accumulation in the front bearing seat. INVENTION CONTENTS

[0005] The utility model aims at providing machine tool spindle and machine tool spindle's front bearing seat, to solve the technical problem of heat accumulation of rear bearing seat when using the above "front-middle-rear" cooling scheme and the technical problem of heat accumulation of front bearing seat when using the above "rear-middle-front" cooling scheme.

[0006] The first aspect provides a machine tool spindle, comprising: a spindle body; a 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 with the motor stator; a spindle core rotatably mounted in the spindle body through a front bearing system and a rear bearing system and rotating with the motor rotor, the spindle core front end being provided with a tool holder assembly structure; 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, and the front bearing being mounted in the front bearing seat and rotatably supporting the front part of the spindle core; 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, and the rear bearing being mounted in the rear bearing seat and rotatably supporting the rear part of the spindle core; a tool holder locking and releasing mechanism comprising an executing mechanism and a driving mechanism, the executing mechanism being capable of locking the tool holder to tightly fit the tool holder with the tool holder assembly structure when the driving mechanism operates in a first driving mode, and the executing mechanism being capable of releasing the tool holder to enable the tool holder to be separated from the tool holder assembly structure when the driving mechanism operates in a second driving mode; a spindle cooling system comprising a cooling liquid passage network, the cooling liquid passages in the cooling liquid passage network being distributed in the shell layers of the spindle body, the front bearing seat and the rear bearing seat and being connected with a machine tool cooling liquid input interface and a machine tool cooling liquid return interface respectively; the cooling liquid passages distributed in the shell layer of the rear bearing seat in the cooling liquid passage network comprising a rear bearing seat annular cooling passage, the rear bearing seat annular cooling passage being provided with a rear bearing seat annular cooling passage cooling liquid inlet and a rear bearing seat annular cooling passage cooling liquid outlet; the cooling liquid passages distributed in the shell layer of the spindle body in the cooling liquid passage network comprising a spindle body annular cooling passage and a spindle body axial flow guide passage, the spindle body annular cooling passage being provided with a spindle body annular cooling passage cooling liquid inlet and a spindle body annular cooling passage cooling liquid outlet, and the spindle body axial flow guide passage being provided with a spindle body axial flow guide passage cooling liquid inlet and a spindle body axial flow guide passage cooling liquid outlet; the cooling liquid passages distributed in the shell layer of the front bearing seat in the cooling liquid passage network comprising a front bearing seat annular cooling passage, the front bearing seat annular cooling passage being provided with a front bearing seat annular cooling passage cooling liquid inlet and a front bearing seat annular cooling passage cooling liquid outlet; wherein the rear bearing seat annular cooling passage cooling liquid inlet is in communication with the machine tool cooling liquid input interface, the rear bearing seat annular cooling passage cooling liquid outlet is in communication with the spindle body axial flow guide passage cooling liquid inlet, the spindle body axial flow guide passage cooling liquid outlet is in communication with the front bearing seat annular cooling passage cooling liquid inlet, the front bearing seat annular cooling passage cooling liquid outlet is in communication with the spindle body annular cooling passage cooling liquid inlet, and the spindle body annular cooling passage cooling liquid outlet is in communication with the machine tool cooling liquid return interface.The main shaft cooling system works, the cooling liquid flows among the rear bearing seat ring cooling channel, the main shaft body ring cooling channel and the front bearing seat ring cooling channel in the order of first passing through the rear bearing seat ring cooling channel, then passing through the front bearing seat ring cooling channel, and finally passing through the main shaft body ring cooling channel.

[0007] As an improvement and / or instantiation of the first aspect of the machine tool spindle, further: the rear bearing seat ring cooling channel comprises a rear bearing seat outer sidewall annular groove circumferentially arranged on the outer sidewall of the rear bearing seat matched with the inner sidewall of the main shaft body.

[0008] As an improvement and / or instantiation of the first aspect of the machine tool spindle, further: the main shaft body ring cooling channel comprises a plurality of intermediate sleeve outer sidewall annular grooves arranged uniformly in the axial direction on the outer sidewall of the intermediate sleeve sleeved between the inner sidewall of the main shaft body and the outer sidewall of the motor stator, the outer sidewall of the intermediate sleeve is provided with a plurality of convex rings arranged uniformly in the axial direction, so that an intermediate sleeve outer sidewall annular groove is formed between any two adjacent convex rings, a recess is formed on each of the plurality of convex rings, and the recesses of any two adjacent convex rings are 180° apart in the circumferential direction, the plurality of convex rings are respectively matched with the inner sidewall of the main shaft body, and the recess on each of the plurality of convex rings allows the intermediate sleeve outer sidewall annular groove to be communicated between any two adjacent intermediate sleeve outer sidewall annular grooves; the main shaft body ring cooling channel cooling liquid inlet is communicated with the intermediate sleeve outer sidewall annular groove at the front end of the intermediate sleeve, and the recess on the convex ring at the front end of the intermediate sleeve is 180° apart in the circumferential direction; the main shaft body ring cooling channel cooling liquid outlet is communicated with the intermediate sleeve outer sidewall annular groove at the rear end of the intermediate sleeve, and the recess on the convex ring at the rear end of the intermediate sleeve is 180° apart in the circumferential direction.

[0009] As an improvement and / or instantiation of the first aspect of the machine tool spindle, further: the main shaft body ring cooling channel comprises an intermediate sleeve outer sidewall spiral groove formed on the outer sidewall of the intermediate sleeve sleeved between the inner sidewall of the main shaft body and the outer sidewall of the motor stator, the main shaft body ring cooling channel cooling liquid inlet is arranged at the front end of the intermediate sleeve outer sidewall spiral groove, and the main shaft body ring cooling channel cooling liquid outlet is arranged at the rear end of the intermediate sleeve outer sidewall spiral groove.

[0010] As an improvement and / or embodiment of the machine tool spindle of the first aspect above, further: the spindle body axial flow channel is formed by spindle body axial flow holes opened in the spindle body; the spindle body axial flow channel cooling liquid inlet is arranged at the rear end of the spindle body axial flow hole, and the spindle body axial flow channel cooling liquid outlet is arranged at the front end of the spindle body axial flow hole.

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

[0012] As an improvement and / or embodiment of the machine tool spindle of the first aspect above, further: the front bearing seat has a front bearing seat body and a ring-shaped member fitted and installed on the inner side surface of the front bearing seat body, and the front bearing seat annular cooling channel comprises a front bearing seat body inner side wall annular groove arranged circumferentially on the inner side wall of the front bearing seat body.

[0013] As an improvement and / or embodiment of the machine tool spindle of the first aspect above, further: the middle region of the outer side surface of the front bearing seat body is provided with a spindle body front end mounting flange, a plurality of bolt axial mounting holes are arranged circumferentially on the spindle body front end mounting flange, the front end of the spindle body is fitted with the spindle body front end mounting flange and connected together by inserting bolts into the bolt axial mounting holes; the front bearing seat annular cooling channel further comprises a front bearing seat body outer side wall annular groove arranged circumferentially on the part of the outer side wall of the front bearing seat body that cooperates with the inner side wall of the spindle body; the front bearing seat body is provided with a front bearing seat body internal passage that connects the front bearing seat body inner side wall annular groove and the front bearing seat body outer side wall annular groove; the front bearing seat annular cooling channel cooling liquid inlet is arranged on the front bearing seat body inner side wall annular groove, and the front bearing seat annular cooling channel cooling liquid outlet is arranged on the front bearing seat body outer side wall annular groove.

[0014] As an improvement and / or instantiation of the first aspect of the machine tool spindle, further: the bottom of the annular groove of the inner side wall of the front bearing seat body is provided with an arc-shaped flow collection groove, two cooling liquid inlet holes are arranged in parallel at the bottom of the arc-shaped flow collection groove, and the two cooling liquid inlet holes respectively form the cooling liquid inlets of the front bearing seat annular cooling channel.

[0015] As an improvement and / or instantiation of the first aspect of the machine tool spindle, further: the cooling liquid channel network distributed in the shell layer of the spindle body further comprises a spindle body axial output channel, and the cooling liquid outlet of the spindle body annular cooling channel is communicated with the machine tool cooling liquid return interface through the spindle body axial output channel.

[0016] The second aspect provides a front bearing seat of a machine tool spindle, which comprises a front bearing seat body and a front bearing seat annular cooling channel arranged on the front bearing seat body. The middle region of the outer side surface of the front bearing seat body is provided with a spindle body front end mounting flange. The front bearing seat annular cooling channel is distributed with a front bearing seat annular cooling channel cooling liquid inlet and a front bearing seat annular cooling channel cooling liquid outlet. The front bearing seat annular cooling channel comprises a front bearing seat body inner side wall annular groove arranged circumferentially on the inner side wall of the front bearing seat body. The front bearing seat annular cooling channel cooling liquid inlet is arranged on the front bearing seat body inner side wall annular groove. The front bearing seat annular cooling channel further comprises a front bearing seat body outer side wall annular groove arranged circumferentially on the outer side wall of the front bearing seat body at a position behind the spindle body front end mounting flange. The front bearing seat annular cooling channel cooling liquid outlet is arranged on the front bearing seat body outer side wall annular groove. The front bearing seat body is provided with a front bearing seat body internal channel for communicating the front bearing seat body inner side wall annular groove and the front bearing seat body outer side wall annular groove.

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

[0018] As an improvement and / or instance of the front bearing housing of the machine tool spindle in the second aspect above, further: the front end mounting flange of the spindle body is provided with a plurality of bolt axial mounting holes distributed circumferentially.

[0019] The first aspect of the machine tool spindle mentioned above adopts a "rear-front-middle" cooling scheme (i.e., when the spindle cooling system is working, the coolant flows through the rear bearing housing circumferential cooling channel, the spindle body circumferential cooling channel, and the front bearing housing circumferential cooling channel in the following order: first through the rear bearing housing circumferential cooling channel, then through the front bearing housing circumferential cooling channel, and finally through the spindle body circumferential cooling channel). This effectively solves the shortcomings of the previous two schemes and optimizes the overall cooling effect. First, the rear bearing housing is cooled to prevent heat accumulation at the rear; then the front bearing housing is cooled to ensure the accuracy of the spindle front end; since the heat generated by the rear and front bearing housings is much smaller than that of the spindle body, the spindle body (including the motor stator) is cooled last, allowing for more uniform cooling using coolant at a moderate temperature. This sequence not only balances heat distribution and improves the thermal gradient but also optimizes the cooling effect on the main heat source (motor stator). More balanced temperature control helps maintain the high-precision operation of the spindle while improving the efficiency of the entire cooling system.

[0020] The front bearing housing of the machine tool spindle in the second aspect mentioned above is specifically designed for the machine tool spindle in the first aspect mentioned above, and can realize the conversion of coolant from the front bearing housing to the cooling channel and then to the spindle body to the cooling channel.

[0021] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Additional aspects and advantages of the present invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice. Attached Figure Description

[0022] The accompanying drawings, which form part of this specification, are used to aid in understanding the present invention. The contents provided in the drawings and their related descriptions in this specification can be used to explain the present invention, but do not constitute an undue limitation on the present invention.

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

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

[0025] Figure 3 for Figure 1 The machine tool spindle shown is a sectional view on the third section.

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

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

[0028] Figure 5 For Figure 1 A cross-sectional view of the spindle cooling system of the machine tool spindle (the cross section corresponds to Figure 1 ).

[0029] Figure 6 A cross-sectional view of the spindle cooling system of the machine tool spindle (the cross section corresponds to Figure 1 ). Figure 2

[0030] A three-dimensional view of the front bearing seat body of the machine tool spindle. Figure 7 Figure 1 A three-dimensional view of the front bearing seat body of the machine tool spindle.

[0031] Figure 8 A partial cross-sectional view of the front bearing seat body of the machine tool spindle. Figure 1

[0032] Figure 9 A partial cross-sectional view of the front bearing seat body of the machine tool spindle. Figure 1 DETAILED DESCRIPTION The present application will be described in detail below with reference to the drawings. Those skilled in the art will be able to implement the present application based on these descriptions. Before the present application is described in detail with reference to the drawings, it is important to specifically point out that:

[0033] The technical solutions and technical features provided in each part including the following description can be combined with each other in the case of no conflict. In addition, in the case of possibility, these technical solutions, technical features and related combinations can be given a specific technical subject and protected by a related patent.

[0034] The embodiments of the present application involved in the following description are usually only a part of the embodiments and not all the embodiments. Based on these embodiments, all other embodiments obtained by those skilled in the art without creative labor should belong to the scope of patent protection.

[0035] The embodiments of the present application involved in the following description are usually only a part of the embodiments and not all the embodiments. Based on these embodiments, all other embodiments obtained by those skilled in the art without creative labor should belong to the scope of patent protection.

[0036] ​​Regarding terms and units in this specification: The terms "comprise", "contain", "have" and any variations thereof used in the specification and claims of this document and related parts are intended to cover both non-exclusive and exclusive inclusion. In addition, other related terms and units can be reasonably interpreted based on the relevant content provided in the specification.

[0037] As Figures 1-9The machine tool spindle comprises a spindle body 1, a spindle motor comprising a motor stator fixed in the spindle body 1 and a motor rotor matched with the motor stator, a shaft core 3 rotatably installed in the spindle body 1 and rotating with the motor rotor through a front bearing system 4 and a rear bearing system 5, the front end of the shaft core 3 being provided with a tool holder assembly structure, the front bearing system 4 comprising a front bearing seat arranged at the front end of the spindle body and a front bearing rotatably supported by the front bearing seat, the rear bearing system 5 comprising a rear bearing seat arranged at the rear end of the spindle body and a rear bearing rotatably supported by the rear bearing seat, a tool holder locking and releasing mechanism 6 comprising an executing mechanism and a driving mechanism, the executing mechanism being capable of locking the tool holder to tightly fit the tool holder with the tool holder assembly structure when the driving mechanism operates in a first driving mode, and the executing mechanism being capable of releasing the tool holder to enable the tool holder to be separated from the tool holder assembly structure when the driving mechanism operates in a second driving mode, a spindle cooling system 7 comprising a cooling liquid passage network, the cooling liquid passages in the cooling liquid passage network being distributed in the shell layers of the spindle body 1, the front bearing seat and the rear bearing seat and being connected with a machine tool cooling liquid input interface 7a and a machine tool cooling liquid return interface 7b respectively, the cooling liquid passages distributed in the shell layer of the rear bearing seat in the cooling liquid passage network comprising a rear bearing seat circumferential cooling passage 71, the rear bearing seat circumferential cooling passage 71 being provided with a rear bearing seat circumferential cooling passage cooling liquid inlet and a rear bearing seat circumferential cooling passage cooling liquid outlet, the cooling liquid passages distributed in the shell layer of the spindle body 1 in the cooling liquid passage network comprising a spindle body circumferential cooling passage 72 and a spindle body axial flow guide passage 73, the spindle body circumferential cooling passage being provided with a spindle body circumferential cooling passage cooling liquid inlet and a spindle body circumferential cooling passage cooling liquid outlet, the spindle body axial flow guide passage being provided with a spindle body axial flow guide passage cooling liquid inlet and a spindle body axial flow guide passage cooling liquid outlet, the cooling liquid passages distributed in the shell layer of the front bearing seat in the cooling liquid passage network comprising a front bearing seat circumferential cooling passage 74, the front bearing seat circumferential cooling passage 74 being provided with a front bearing seat circumferential cooling passage cooling liquid inlet and a front bearing seat circumferential cooling passage cooling liquid outlet.The rear bearing seat ring circumferential cooling channel cooling liquid inlet is communicated with the machine tool cooling liquid input interface, the rear bearing seat ring circumferential cooling channel cooling liquid outlet is communicated with the main shaft body axial guide channel cooling liquid inlet, the main shaft body axial guide channel cooling liquid outlet is communicated with the front bearing seat ring circumferential cooling channel cooling liquid inlet, the front bearing seat ring circumferential cooling channel cooling liquid outlet is communicated with the main shaft body ring circumferential cooling channel cooling liquid inlet, and the main shaft body ring circumferential cooling channel cooling liquid outlet is communicated with the machine tool cooling liquid return interface; when the main shaft cooling system works, the cooling liquid flows among the rear bearing seat ring circumferential cooling channel 71, the main shaft body ring circumferential cooling channel 72 and the front bearing seat ring circumferential cooling channel 74 in the order of first passing through the rear bearing seat ring circumferential cooling channel 71, then passing through the front bearing seat ring circumferential cooling channel 74 and finally passing through the main shaft body ring circumferential cooling channel 72.

[0038] The machine tool main shaft adopts the "rear-front-middle" cooling scheme (that is, when the main shaft cooling system 7 works, the cooling liquid flows among the rear bearing seat ring circumferential cooling channel 71, the main shaft body ring circumferential cooling channel 72 and the front bearing seat ring circumferential cooling channel 74 in the order of first passing through the rear bearing seat ring circumferential cooling channel 71, then passing through the front bearing seat ring circumferential cooling channel 74 and finally passing through the main shaft body ring circumferential cooling channel 72), effectively solving the shortcomings of the previous two schemes, and optimizing the overall cooling effect. First, the rear bearing seat is cooled, avoiding heat accumulation in the rear part; then the front bearing seat is cooled, ensuring the precision of the front end of the main shaft; since the heat generated by the rear bearing seat and the front bearing seat is much smaller than that of the main shaft body, the main shaft body 1 (including the motor stator) is finally cooled, which can be more uniformly cooled by using cooling liquid with moderate temperature. This sequence not only balances the heat distribution, improves the thermal gradient, but also optimizes the cooling effect of the main heat source (the motor stator). Through more balanced temperature control, it helps to maintain the high-precision operation of the main shaft, and improves the efficiency of the entire cooling system.

[0039] The rear bearing seat ring circumferential cooling channel 71 comprises a rear bearing seat outer side wall annular groove circumferentially arranged on the outer side wall of the rear bearing seat matched with the inner side wall of the main shaft body 1.

[0040] The main shaft body annular cooling channel 72 can adopt the scheme provided in the patent document with application number 202311546879.5, that is, the main shaft body annular cooling channel 72 comprises a plurality of intermediate sleeve outer wall annular grooves arranged along the axis and uniformly spaced apart, which are formed on the outer wall of the intermediate sleeve 11 sleeved between the inner side wall of the main shaft body 1 and the outer side wall of the motor stator. The outer wall of the intermediate sleeve is provided with a plurality of convex rings arranged along the axis and uniformly spaced apart, so that an intermediate sleeve outer wall annular groove is formed between any two adjacent convex rings. A recess is formed on each of the plurality of convex rings, and the recesses of any two adjacent convex rings are 180° apart in the circumferential direction. The plurality of convex rings are respectively matched with the inner side wall of the main shaft body. The recess on each of the plurality of convex rings allows the passage between any two adjacent intermediate sleeve outer wall annular grooves through the corresponding recess. The main shaft body annular cooling channel cooling liquid inlet is communicated with the intermediate sleeve outer wall annular groove at the front end of the intermediate sleeve, and the recess on the convex ring at the front end of the intermediate sleeve is 180° apart in the circumferential direction. The main shaft body annular cooling channel cooling liquid outlet is communicated with the intermediate sleeve outer wall annular groove at the rear end of the intermediate sleeve, and the recess on the convex ring at the rear end of the intermediate sleeve is 180° apart in the circumferential direction.

[0041] In another specific embodiment, the main shaft body annular cooling channel 72 can comprise an intermediate sleeve outer wall spiral groove formed on the outer wall of the intermediate sleeve 11 sleeved between the inner side wall of the main shaft body 1 and the outer side wall of the motor stator. The main shaft body annular cooling channel cooling liquid inlet is arranged at the front end of the intermediate sleeve outer wall spiral groove, and the main shaft body annular cooling channel cooling liquid outlet is arranged at the rear end of the intermediate sleeve outer wall spiral groove.

[0042] The main shaft body axial flow guide channel 73 is formed by a main shaft body axial flow guide hole formed in the main shaft body. The main shaft body axial flow guide channel cooling liquid inlet is arranged at the rear end of the main shaft body axial flow guide hole, and the main shaft body axial flow guide channel cooling liquid outlet is arranged at the front end of the main shaft body axial flow guide hole.

[0043] Specifically, the number of 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 main shaft body axial flow guide holes is small (two), this helps to improve the strength of the main shaft body 1.

[0044] The front bearing seat has a front bearing seat body 41 and a ring 42 installed on the inner side of the front bearing seat body 41. The front bearing seat ring cooling channel 74 comprises a front bearing seat body inner side wall ring groove 741 circumferentially arranged on the inner side wall of the front bearing seat body 41. In addition, the middle region of the outer side of the front bearing seat body 41 is provided with a main shaft body front end mounting flange 43, and a plurality of bolt axial mounting holes are circumferentially arranged on the main shaft body front end mounting flange 43. The front end of the main shaft body 1 is connected together with the main shaft body front end mounting flange 43 through bolts 44 inserted into the bolt axial mounting holes. The front bearing seat ring cooling channel 74 further comprises a front bearing seat body outer side wall ring groove 742 circumferentially arranged on the outer side wall of the front bearing seat body 41 and matched with the inner side wall of the main shaft body 1. The front bearing seat body 41 is provided with a front bearing seat body internal passage for connecting the front bearing seat body inner side wall ring groove 741 and the front bearing seat body outer side wall ring groove 742. The front bearing seat ring cooling channel cooling liquid inlet is arranged on the front bearing seat body inner side wall ring groove 741, and the front bearing seat ring cooling channel cooling liquid outlet is arranged on the front bearing seat body outer side wall ring groove 742.

[0045] The advantages of this design mainly include: first, the ring groove structure of the inner and outer side walls of the front bearing seat body 41 (the front bearing seat body inner side wall ring groove 741 and the front bearing seat body outer side wall ring groove 742) and the front bearing seat body internal passage form an efficient cooling loop, which can comprehensively cover the front bearing seat area and ensure uniform cooling. Second, the main shaft body front end mounting flange 43 and the bolt connection mode stably and reliably install the front bearing seat body 41 and the main shaft body 1 together, and the front bearing seat body inner side wall ring groove 741 and the front bearing seat body outer side wall ring groove 742 are located on both sides of the main shaft body front end mounting flange 43, so that the front bearing seat ring cooling channel 74 can be transitioned to the main shaft body ring cooling channel 72 through the passage (see Figure 6 ) formed in the main shaft body 1. It can be seen that this structure design not only optimizes the cooling effect, but also considers the assembly convenience and structural stability.

[0046] The bottom of the annular groove 741 of the front bearing seat body inner side wall is provided with an arc-shaped flow collection groove 743, the bottom of the arc-shaped flow collection groove 743 is provided with two parallel cooling liquid inlet holes, and the two cooling liquid inlet holes form the front bearing seat ring-shaped cooling channel cooling liquid inlets, respectively.

[0047] The arc-shaped flow collection groove 743 can effectively collect and distribute the cooling liquid. The design that the two parallel cooling liquid inlet holes correspond to the two main shaft body axial flow guide holes one by one ensures the uniform distribution and flow of the cooling liquid, and then the arc-shaped flow collection groove 743 is used to guide the flow in two different directions, so that the front bearing seat is rapidly cooled. The number of the main shaft body axial flow guide holes is limited to two and arranged close to each other, so that the structural strength of the main shaft body 1 is maximally reserved while ensuring sufficient cooling effect.

[0048] The cooling liquid channel network further comprises a main shaft body axial output channel, the main shaft body ring-shaped cooling channel cooling liquid outlet is communicated with the machine tool cooling liquid return interface through the main shaft body axial output channel.

[0049] The above related contents of the utility model have been described. The ordinary skilled in the art can realize the utility model based on these descriptions. Based on the above contents of the description, all other embodiments obtained by the ordinary skilled in the art without creative labor should belong to the scope of patent protection.

Claims

1. A front bearing seat of a machine tool spindle, comprising a front bearing seat body and a front bearing seat annular cooling channel arranged on the front bearing seat body, a middle region of an outer side surface of the front bearing seat body is provided with a spindle body front end mounting flange, the front bearing seat annular cooling channel is distributed with a front bearing seat annular cooling channel cooling liquid inlet and a front bearing seat annular cooling channel cooling liquid outlet, the front bearing seat annular cooling channel comprises a front bearing seat body inner side wall annular groove arranged circumferentially on an inner side wall of the front bearing seat body, and the front bearing seat annular cooling channel cooling liquid inlet is arranged on the front bearing seat body inner side wall annular groove, characterized in that: The front bearing seat ring cooling channel further comprises a front bearing seat body outer side wall annular groove which is located at a position behind the main shaft body front end mounting flange on the front bearing seat body outer side wall and is circumferentially arranged; the front bearing seat ring cooling channel cooling liquid outlet is arranged on the front bearing seat body outer side wall annular groove; and the front bearing seat body is provided with a front bearing seat body internal passage which is in communication with the front bearing seat body inner side wall annular groove and the front bearing seat body outer side wall annular groove.

2. A front chock for a machine tool spindle as claimed in claim 1, characterised in that: An arc-shaped flow collecting groove is arranged at the bottom of the front bearing seat body inner side wall annular groove; two cooling liquid inlet holes which are parallel to each other are arranged at the bottom of the arc-shaped flow collecting groove; and the two cooling liquid inlet holes form the front bearing seat ring cooling channel cooling liquid inlet respectively.

3. A front chock for a machine tool spindle as claimed in claim 1, characterized in that: A plurality of bolt axial mounting holes are circumferentially arranged on the main shaft body front end mounting flange.

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