Electric spindle with cooled spindle core

Abstract

The utility model discloses an electric spindle with a cooled spindle core, which comprises a spindle shell provided with an external cooling flow channel, and the external cooling flow channel flows through a part, where a stator, a front bearing and a rear bearing are mounted, of the spindle shell; the motor comprises a stator and a rotor, the stator is fixed on the main shaft shell, and the rotor is arranged on the core shaft in a sleeving manner; and the mandrel is arranged in the main shaft shell through a front bearing and a rear bearing, a mandrel cooling flow channel communicated with a rotary joint is arranged in the mandrel, and the mandrel cooling flow channel flows through the part, where the rotor, the front bearing and the rear bearing are mounted, of the mandrel. The utility model aims to reduce the thermal elongation of the mandrel, improve the precision and service life of the bearing and ensure the machining precision and stability of the electric spindle.

Description

Technical Field

[0001] This utility model relates to the field of electric spindle technology, and in particular to an electric spindle with spindle core cooling. Background Technology

[0002] The heat generated by an electric spindle primarily originates from the motor and bearings. To ensure machining accuracy, it is essential to reduce the heat-affected zone and minimize thermal expansion. Therefore, cooling the electric spindle is crucial. Currently, the cooling structure for electric spindles mainly involves adding external cooling channels to the spindle housing, which can only effectively cool the motor stator and bearing outer rings. In practical applications, because the mandrel is difficult to cool effectively through external cooling channels, the heat generated by the electric spindle leads to significant thermal expansion of the mandrel, which substantially affects the machining accuracy and stability of the electric spindle.

[0003] During spindle rotation, the inner and outer rings of the bearing exhibit different temperature rises relative to their initial temperatures, resulting in varying degrees of thermal expansion and consequently altering the bearing's internal clearance. The external cooling channels within the spindle housing further exacerbate the temperature difference between the outer and inner rings, potentially leading to negative clearance during operation. This increases frictional heat generation, raises the temperature rise, and further reduces the effective clearance. This vicious cycle can cause bearing seizure, severely damaging the bearing's precision and lifespan, and also significantly impacting the machining accuracy and stability of the electric spindle. Utility Model Content

[0004] This invention provides an electric spindle with a core cooling mechanism, which aims to reduce the thermal elongation of the core while improving the accuracy and service life of the bearings, thus ensuring the machining accuracy and stability of the electric spindle.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows:

[0006] An electric spindle with a core cooling system, comprising:

[0007] The spindle housing is provided with an external cooling channel, which flows through the parts of the spindle housing where the stator, front bearing and rear bearing are installed;

[0008] An electric motor includes a stator and a rotor, wherein the stator is fixed on a main shaft housing and the rotor is sleeved on a spindle;

[0009] The mandrel is housed within the spindle housing via a front bearing and a rear bearing. The mandrel has a cooling channel that connects to the rotary joint. The cooling channel flows through the portion of the mandrel where the rotor, the front bearing, and the rear bearing are mounted.

[0010] Furthermore, the mandrel includes a mandrel body and tool holders and tail end distribution cooling sleeves located at both ends of the mandrel body, wherein the tool holders and tail end distribution cooling sleeves are detachably connected to the mandrel body;

[0011] The mandrel body has 2n DC channels arranged in a ring array around the axis of the mandrel body, where n is an integer greater than 1;

[0012] The tool holder is provided with n first transition sections arranged in a ring array around the axis of the spindle body, and each first transition section corresponds to two DC channels;

[0013] The tail end cooling sleeve is provided with n second transition sections arranged in a ring array around the axis of the spindle body. Each second transition section corresponds to two DC channels, and the two second transition sections are provided with interface channels that connect to the rotary joint.

[0014] The first transition section, the second transition section, and the DC channel are interconnected to form the mandrel cooling channel.

[0015] Furthermore, the tail end distribution cooling sleeve is inserted into the mandrel body, and the mandrel body is provided with a first flow channel opened radially along the mandrel body, and the direct flow channel is connected to the second transition section through the first flow channel.

[0016] Furthermore, the first transition section is located on the end face of the tool holder near the mandrel body, and a sealing ring is provided between the first transition section and the mandrel body;

[0017] The tail end distribution cooling sleeve is inserted into the main body of the spindle as an insertion end, the second transition section is located on the outer periphery of the insertion end, and two sealing rings are sleeved on the insertion end and the second transition section is located between the two sealing rings.

[0018] Furthermore, it also includes a broaching mechanism disposed within the mandrel, the broaching mechanism having a central water outlet channel communicating with the rotary joint.

[0019] Furthermore, the rotary joint includes:

[0020] The fixing part fixed on the spindle housing includes a main body, a first static sealing component and a second static sealing component. The first static sealing component and the second static sealing component are floatingly rather than rotatingly assembled on the main body. The main body is provided with a central water outlet fixed flow channel, a cooling inlet fixed flow channel and a cooling outlet fixed flow channel.

[0021] A rotating shaft fixed on the mandrel is rotatably assembled onto the main body. The rotating shaft is provided with a central water outlet rotating channel, a cooling inlet rotating channel, and a cooling outlet rotating channel.

[0022] The central water outlet rotating channel is connected to the central water outlet channel, the cooling inlet rotating channel is connected to the inlet end of the mandrel cooling channel, and the cooling outlet rotating channel is connected to the outlet end of the mandrel cooling channel.

[0023] The first elastic component can provide axial force to drive the first static sealing component to press against the first dynamic sealing end of the rotating shaft, so that the end of the first static sealing component and the end of the first dynamic sealing end fit together to form a contact seal, thereby connecting the central water outlet fixed flow channel and the central water outlet rotating flow channel, and at the same time connecting the cooling inlet fixed flow channel and the cooling inlet rotating flow channel.

[0024] The second elastic component can provide axial force to drive the second static sealing component to press against the second dynamic sealing end of the rotating shaft, so that the ends of the second static sealing component and the second dynamic sealing end fit together to form a contact seal, thereby connecting the fixed flow channel of the cooling outlet and the rotating flow channel of the cooling outlet.

[0025] Furthermore, the main body is provided with a receiving cavity, and the first dynamic sealing end is located in the receiving cavity;

[0026] The first dynamic sealing end divides the receiving cavity into a first distribution cavity and a second distribution cavity. The fixed flow channel of the cooling inlet is connected to the rotating flow channel of the cooling inlet through the first distribution cavity, and the fixed flow channel of the cooling outlet is connected to the rotating flow channel of the cooling outlet through the second distribution cavity.

[0027] Furthermore, a rotation gap is provided between the first dynamic sealing end and the inner wall of the main body. The rotation gap is located between the first distribution cavity and the second distribution cavity. The two ends of the rotation gap are respectively connected to the first distribution cavity and the second distribution cavity. A sealing structure is provided in the rotation gap.

[0028] Furthermore, it also includes a tool-cutting cylinder assembly, which includes a tool-cutting cylinder, a tool-cutting disc, and a connecting column;

[0029] The tool-changing cylinder is fixed on the spindle housing, the tool-changing disc is provided with a through hole that allows the rotary joint to pass through, the piston of the tool-changing cylinder is fixedly connected to the tool-changing disc, and the tool-changing disc is connected to the pull rod of the tool-changing mechanism through a connecting column.

[0030] Furthermore, it also includes a rotary joint extension rod, which is fixed to the end of the rotary joint near the mandrel. The end of the rotary joint extension rod away from the rotary joint is inserted into the pull rod to connect to the central water outlet channel. A glyph is provided between the rotary joint extension rod and the pull rod.

[0031] Beneficial effects:

[0032] This utility model provides an electric spindle with a core cooling system. External cooling channels on the spindle housing cool the stator, the outer ring of the front bearing, and the outer ring of the rear bearing. Internal cooling channels within the spindle cool the rotor, the inner ring of the front bearing, and the inner ring of the rear bearing. This simultaneous internal and external cooling not only reduces the thermal elongation of the spindle but also decreases the temperature difference between the outer and inner rings of the bearings, improving the bearing's operating conditions, increasing its precision and service life, and ultimately ensuring the machining accuracy and stability of the electric spindle. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 This is a partial cross-sectional schematic diagram of an electric spindle with a core cooling system disclosed in this utility model.

[0035] Figure 2 This is a front view schematic diagram of an electric spindle with a core cooling system disclosed in this utility model.

[0036] Figure 3 This is a schematic diagram showing the cooperation between the tool-changing cylinder assembly and the tool-changing mechanism of an electric spindle with shaft core cooling disclosed in this utility model.

[0037] Figure 4 This is a schematic diagram of the structure of a tool holder for an electric spindle with core cooling disclosed in this utility model;

[0038] Figure 5 This is a schematic diagram of the tail end cooling sleeve of an electric spindle with shaft core cooling disclosed in this utility model;

[0039] Figure 6 This is a fluid flow diagram of the spindle of an electric spindle with spindle core cooling disclosed in this utility model;

[0040] Figure 7 This is a schematic diagram of the structure of a rotary joint for a core-cooled electric spindle disclosed in this utility model;

[0041] Figure 8 This is a left view of a rotary joint for a core-cooled electric spindle disclosed in this utility model.

[0042] Figure 9 This is a right view of a rotary joint for a core-cooled electric spindle disclosed in this utility model.

[0043] Figure 10 This is a schematic diagram of the structure of the fixing part of the rotary joint of an electric spindle with shaft core cooling disclosed in this utility model;

[0044] Figure 11 This is a schematic diagram of the rotating shaft of the rotary joint of an electric spindle with a core cooling system disclosed in this utility model.

[0045] Figure 12 for Figure 9 AA section view;

[0046] Figure 13 This is a fluid diagram of a rotary joint for a core-cooled electric spindle disclosed in this utility model.

[0047] Figure 14 for Figure 13 Enlarged view of point B.

[0048] In the picture:

[0049] 1. Fixed base; 101. Central water outlet fixed flow channel;

[0050] 2. Cooling jacket; 201. Fixed flow channel for cooling inlet; 202. Fixed flow channel for cooling outlet;

[0051] 3. First static sealing component; 301. First through hole;

[0052] 4. Second static sealing component; 401. Second through hole;

[0053] 5. First ceramic ring;

[0054] 6. Second ceramic ring;

[0055] 7. Connecting rod; 701. Central water outlet rotary flow channel; 702. Cooling inlet rotary flow channel; 7021. Transition section;

[0056] 8. Rotating ring;

[0057] 9. Third ceramic ring;

[0058] 10. Cooling outlet rotary flow channel;

[0059] 11. Fourth ceramic ring;

[0060] 12. The first spring;

[0061] 13. The second spring;

[0062] 14. First guide post;

[0063] 15. Second guide post;

[0064] 16. Rotation clearance;

[0065] 17. Guide ramp;

[0066] 18. Sealed structure;

[0067] 19. Ball expansion plug;

[0068] 20. O-rings;

[0069] 21. Stepped section;

[0070] 22. Sealing ring;

[0071] 23. Grammy Circle;

[0072] 24. Inspection cover;

[0073] 25. Encoder gear;

[0074] 26. Rotary joint extension rod;

[0075] 27. Knife-beating cylinder;

[0076] 28. Cutting plate;

[0077] 29. Connecting column;

[0078] 30. Central water outlet channel;

[0079] 31. Cutting tool mechanism; 3101. Cutting claw; 3102. Pull rod;

[0080] 32. Mandrel body; 3201. Direct current channel; 3202. First flow channel;

[0081] 33. Tool holder; 3301. First transition section;

[0082] 34. Tail-end cooling jacket; 3401. Second transition section; 3402. Interface flow channel;

[0083] 35. Front bearing;

[0084] 36. Rear bearing;

[0085] 37. Front bearing outer pressure cap;

[0086] 38. Front sealing sleeve;

[0087] 39. Sleeve;

[0088] 40. Rear flange;

[0089] 41. Back seat;

[0090] 42. Front bearing lock nut;

[0091] 43. Front bearing spacer;

[0092] 44. Front bearing housing;

[0093] 45. Rear bearing lock nut;

[0094] 46. ​​Rear bearing spacer;

[0095] 47. Rear bearing housing;

[0096] 48. Mandrel cooling inlet pipe;

[0097] 49. Mandrel cooling outlet pipe;

[0098] 50. Central cooling inlet pipe;

[0099] 51. Adjusting shim;

[0100] 52. Electric motor;

[0101] C. First distribution cavity; D. Second distribution cavity. Detailed Implementation

[0102] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0103] This embodiment provides an electric spindle with a core cooling system, such as... Figure 1 As shown, it includes:

[0104] The spindle housing is provided with an external cooling channel, which flows through the part of the spindle housing where the stator, front bearing 35 and rear bearing 36 are installed;

[0105] The motor 52 includes a stator and a rotor, the stator being fixed on the main shaft housing and the rotor being sleeved on the spindle;

[0106] The mandrel is disposed in the spindle housing via a front bearing 35 and a rear bearing 36. The mandrel is provided with a mandrel cooling channel that connects to the rotary joint. The mandrel cooling channel flows through the part of the mandrel where the rotor, the front bearing 35 and the rear bearing 36 are mounted.

[0107] This embodiment provides an electric spindle with spindle core cooling. The stator, the outer ring of the front bearing 35, and the outer ring of the rear bearing 36 are cooled through external cooling channels on the spindle housing, while the rotor, the inner ring of the front bearing 35, and the inner ring of the rear bearing 36 are cooled through spindle core cooling channels inside the spindle. This simultaneous internal and external cooling not only reduces the thermal elongation of the spindle but also reduces the temperature difference between the outer and inner rings of the bearings, improving the bearing's operating conditions, increasing its precision and service life, and thus ensuring the machining accuracy and stability of the electric spindle.

[0108] In this embodiment, as Figure 1 As shown, the spindle housing includes a front bearing outer pressure cover 37, a front sealing sleeve 38, a sleeve 39, a rear flange 40, and a rear seat 41, which are fixedly connected in sequence by bolts. The front bearing 35 and the rear bearing 36 are respectively mounted on the front bearing assembly and the rear bearing assembly.

[0109] The front bearing assembly includes a front bearing locking nut 42, a front bearing spacer 43, and a front bearing housing 44. The front bearing housing 44 is fixed on the spindle housing. The front bearing 35 is mounted on the front bearing housing 44. The front bearing spacer 43 is sleeved on the spindle and located between the two front bearings 35. The front bearing locking nut 42 is threaded to the spindle and is used to prevent the front bearing 35 from coming out of the front bearing housing 44.

[0110] The rear bearing assembly includes a rear bearing locking nut 45, a rear bearing spacer 46, and a rear bearing housing 47. The rear bearing housing 47 is fixed on the spindle housing, and the rear bearing 36 is mounted on the rear bearing housing 47. The rear bearing spacer 46 is sleeved on the spindle and located between the two rear bearings 36. The rear bearing locking nut 45 is threaded to the spindle and is used to prevent the rear bearing 36 from coming out of the rear bearing housing 47.

[0111] In a specific embodiment, such as Figure 1 , Figure 2 and Figure 6 As shown, the mandrel includes a mandrel body 32 and tool holders 33 and tail end distribution cooling sleeves 34 located at both ends of the mandrel body 32. The tool holders 33 and tail end distribution cooling sleeves 34 are detachably connected to the mandrel body 32 by bolts, and different tool holders 33 can be replaced according to different tools.

[0112] like Figure 6 As shown, the mandrel body 32 is provided with 2n DC channels 3201 arranged in a ring array around the axis of the mandrel body 32, where n is an integer greater than 1;

[0113] like Figure 4As shown, the tool holder 33 is provided with n first transition sections 3301 arranged in a ring array around the axis of the spindle body 32, and each first transition section 3301 corresponds to two direct current channels 3201;

[0114] like Figure 5 As shown, the tail end distribution cooling sleeve 34 is provided with n second transition sections 3401 arranged in a ring array around the axis of the spindle body 32. Each second transition section 3401 corresponds to two DC channels 3201, and the two second transition sections 3401 are provided with interface channels 3402 that connect to the rotary joint.

[0115] The first transition section 3301, the second transition section 3401, and the direct current channel 3201 are interconnected to form a serpentine mandrel cooling channel;

[0116] By dividing the mandrel cooling channel into an interconnected first transition section 3301, a second transition section 3401, and a direct current channel 3201, the machining difficulty is reduced, and the serpentine mandrel cooling channel can effectively ensure the cooling effect.

[0117] In a specific embodiment, such as Figure 3 and Figure 6 As shown, the tail end distribution cooling sleeve 34 is inserted into the spindle body 32. The spindle body 32 is provided with a first flow channel 3202 that is radially opened along the spindle body 32. The direct flow channel 3201 is connected to the second transition section 3401 through the first flow channel 3202.

[0118] By inserting the tail-end cooling sleeve 34 into the spindle body 32, the overall length of the spindle can be reduced, thereby increasing the rigidity of the spindle.

[0119] In a specific embodiment, such as Figure 4 As shown, the first transition section 3301 is located on the end face of the tool holder 33 near the spindle body 32, as... Figure 1 As shown, a sealing ring 22 is provided between the first transition section 3301 and the spindle body 32;

[0120] The tail end distribution cooling sleeve 34 is inserted into the spindle body 32 at one end, which is the insertion end. Figure 5 As shown, the second transition segment 3401 is located on the outer periphery of the insertion end, as... Figure 3 As shown, two sealing rings 22 are fitted on the insertion end and the second transition section 3401 is located between the two sealing rings 22;

[0121] The sealing ring 22 provided between the first transition section 3301 and the spindle body 32 can ensure that the coolant does not leak from the joint.

[0122] To reduce the complexity of the sealing structure, this embodiment places the second transition section 3401 between the two sealing rings 22 fitted on the insertion end, so that the coolant will not leak out from the space enclosed by the two sealing rings 22 fitted on the insertion end, the insertion end and the spindle body 32. There is a small amount of leakage between adjacent second transition sections 3401, but since the leakage is all coolant, it does not affect normal use.

[0123] In a specific embodiment, such as Figure 1 As shown, it also includes a broaching mechanism 31 disposed in the mandrel. The broaching mechanism 31 is provided with a central water outlet channel 30 that connects to the rotary joint, so as to provide coolant to the cutting tool through the central water outlet channel 30.

[0124] In a specific embodiment, such as Figure 12 and Figure 13 As shown, the rotary joint includes:

[0125] The fixing part fixed on the spindle housing includes a main body, a first static sealing component 3 and a second static sealing component 4. The first static sealing component 3 and the second static sealing component 4 are floatingly rather than rotatingly mounted on the main body. The main body is provided with a central water outlet fixed flow channel 101, a cooling inlet fixed flow channel 201 and a cooling outlet fixed flow channel 202. The interface flow channels 3402 provided on the two second transition sections 3401 are respectively connected to the cooling inlet fixed flow channel 201 and the cooling outlet fixed flow channel 202.

[0126] A rotating shaft fixed on the spindle is rotatably assembled on the main body. The rotating shaft is provided with a central water outlet rotating channel 701, a cooling inlet rotating channel 702, and a cooling outlet rotating channel 10.

[0127] The central water outlet rotary flow channel 701 is connected to the central water outlet flow channel 30, the cooling inlet rotary flow channel 702 is connected to the inlet end of the mandrel cooling flow channel, and the cooling outlet rotary flow channel 10 is connected to the outlet end of the mandrel cooling flow channel.

[0128] The first elastic component can provide axial force to drive the first static sealing component 3 to press against the first dynamic sealing end of the rotating shaft, so that the end of the first static sealing component 3 and the end of the first dynamic sealing end fit together to form a contact seal, so that the central water outlet fixed flow channel 101 and the central water outlet rotating flow channel 701 are connected, and at the same time, the cooling inlet fixed flow channel 201 and the cooling inlet rotating flow channel 702 are connected.

[0129] The second elastic component can provide axial force to drive the second static sealing component 4 to press against the second dynamic sealing end of the rotating shaft, so that the ends of the second static sealing component 4 and the second dynamic sealing end fit together to form a contact seal, thereby connecting the cooling outlet fixed flow channel 202 and the cooling outlet rotating flow channel 10.

[0130] By providing axial force through the first and second elastic components, the first static sealing component 3 and the second static sealing component 4 on the drive body are pressed against the first dynamic sealing end and the second dynamic sealing end of the rotating shaft, respectively, so that a contact seal is formed between the fixed part and the rotating shaft. This allows the central water outlet fixed flow channel 101 and the central water outlet rotating flow channel 701, the cooling inlet fixed flow channel 201 and the cooling inlet rotating flow channel 702 to be connected, and the cooling outlet fixed flow channel 202 and the cooling outlet rotating flow channel 10 to be connected. This forms a central flow channel for connecting the central water outlet flow channel, as well as an inlet flow channel and an outlet flow channel for connecting the inlet end and the outlet end of the spindle cooling flow channel, respectively, so as to simultaneously meet the dual needs of central water outlet and spindle cooling of the electric spindle.

[0131] In a specific embodiment, the main body is provided with a receiving cavity, and the first dynamic sealing end is located in the receiving cavity;

[0132] The first dynamic sealing end divides the receiving cavity into a first distribution cavity C and a second distribution cavity D. The cooling inlet fixed flow channel 201 is connected to the cooling inlet rotating flow channel 702 through the first distribution cavity C, and the cooling outlet fixed flow channel 202 is connected to the cooling outlet rotating flow channel 10 through the second distribution cavity D.

[0133] Through the first distribution chamber C and the second distribution chamber D, the coolant flowing in from the several fixed cooling inlet channels 201 can be evenly distributed into the several rotating cooling inlet channels 702, and the coolant flowing in from the several rotating cooling outlet channels 10 can be evenly distributed into the several fixed cooling outlet channels 202.

[0134] In a specific embodiment, such as Figure 14 As shown, a rotation gap 16 is left between the first dynamic sealing end and the inner wall of the main body. The rotation gap 16 is located between the first distribution cavity C and the second distribution cavity D. The two ends of the rotation gap 16 are respectively connected to the first distribution cavity C and the second distribution cavity D. A sealing structure 18 is provided in the rotation gap 16.

[0135] By setting the rotation gap 16, the first dynamic sealing end of the rotating shaft can be rotated relative to the main body. By setting the sealing structure 18, the relative flow of coolant in the first distribution chamber C and the second distribution chamber D is reduced.

[0136] In a specific embodiment, the sealing structure 18 is a wear-resistant ring. In this embodiment, the cooling sleeve 2 of the main body is provided with a groove for installing the wear-resistant ring, so that the fixing seat 1 of the main body and the cooling sleeve 2 form a contact seal through the wear-resistant ring.

[0137] In a specific embodiment, such as Figure 14 As shown, the cooling inlet rotating flow channel 702 is provided with a transition section 7021 that is inclined toward the cooling inlet fixed flow channel 201. The first static sealing component 3 located in the first distribution cavity C is provided with a stepped portion 21. The coolant flowing from the cooling inlet fixed flow channel 201 into the first distribution cavity C flows into the transition section 7021 after being reversed by the stepped portion 21, ensuring smoother coolant flow. At the same time, it avoids direct impact on the contact area between the first static sealing component 3 and the first dynamic sealing end when the coolant flows from the cooling inlet rotating flow channel 702 into the first distribution cavity C, so as not to affect the sealing effect.

[0138] In a specific embodiment, such as Figure 14 As shown, the second distribution chamber D is provided with a guide slope 17. The guide slope 17 is located at the end of the rotation gap 16 near one end of the second distribution chamber D. The guide slope is used to guide the fluid away from the rotation gap 16 and flow towards the cooling outlet fixed flow channel 202, so that the flow of coolant is smoother. At the same time, the coolant flowing into the second distribution chamber D from the cooling outlet rotation flow channel 10 does not flow directly to the rotation gap 16, thereby reducing the flow rate of coolant from the second distribution chamber D to the first distribution chamber C.

[0139] In a specific embodiment, such as Figure 12 As shown, the end of the first dynamic sealing end is provided with a third ceramic ring 9, the end of the first static sealing component 3 is provided with a first ceramic ring 5 opposite to the third ceramic ring 9, the end of the second dynamic sealing end is provided with a fourth ceramic ring 11, and the end of the second static sealing component 4 is provided with a second ceramic ring 6 opposite to the fourth ceramic ring 11.

[0140] Under the axial force provided by the elastic component, the tightly fitted ceramic rings exhibit a good sealing effect, and the excellent wear resistance of the ceramic rings makes them suitable for high-speed electric spindles.

[0141] In a specific embodiment, such as Figures 7 to 12 As shown, the main body includes a fixed base 1 and a cooling sleeve 2. The cooling sleeve 2 is fixed to the fixed base 1 by bolts, and the cooling sleeve 2 and the fixed base 1 form a receiving cavity.

[0142] The fixed base 1 is provided with a central water outlet fixed flow channel 101. The first static sealing component 3 is floatingly rather than rotatingly mounted on the fixed base 1. The first static sealing component 3 is provided with a first through hole 301 that communicates with the central water outlet fixed flow channel 101. The first static sealing component 3 is provided with a first ceramic ring 5 at the end of the first through hole 301. In this embodiment, the first ceramic ring 5 is embedded in a groove opened on the first static sealing component 3.

[0143] The cooling jacket 2 is provided with a cooling inlet fixed flow channel 201 and a cooling outlet fixed flow channel 202. The second static sealing component 4 is floatingly rather than rotatingly mounted on the cooling jacket 2. The second static sealing component 4 is provided with a second through hole 401 that communicates with the cooling outlet fixed flow channel 202. The second static sealing component 4 is provided with a second ceramic ring 6 at the end of the second through hole 401. In this embodiment, the second ceramic ring 6 is embedded in a groove opened on the second static sealing component 4.

[0144] The rotating shaft includes a connecting rod 7 and a rotating ring 8. The connecting rod 7 is rotatably mounted on the cooling jacket 2, and the rotating ring 8 is fixed to the connecting rod 7 by bolts.

[0145] The connecting rod 7 is provided with a central water outlet rotating channel 701 and a cooling inlet rotating channel 702. The connecting rod 7 is provided with a third ceramic ring 9 that is opposite to the first ceramic ring 5. The end of the connecting rod 7 with the third ceramic ring 9 is the first dynamic sealing end.

[0146] The rotating ring 8 and the connecting rod 7 form a cooling outlet rotating flow channel 10. The rotating ring 8 is provided with a fourth ceramic ring 11 that is opposite to the second ceramic ring 6. The end of the rotating ring 8 with the fourth ceramic ring 11 is the second dynamic sealing end.

[0147] The first elastic component can provide an axial force to drive the first ceramic ring 5 to press on the third ceramic ring 9, so that the first ceramic ring 5 and the third ceramic ring 9 are tightly fitted, so that the central water outlet fixed flow channel 101 is connected to the central water outlet rotating flow channel 701 through the first through hole 301, and at the same time, the cooling inlet fixed flow channel 201 and the cooling inlet rotating flow channel 702 are connected.

[0148] The second elastic component can provide axial force to drive the second ceramic ring 6 to press against the fourth ceramic ring 11, so that the second ceramic ring 6 and the fourth ceramic ring 11 are tightly fitted, and the cooling outlet fixed flow channel 202 is connected to the cooling outlet rotating flow channel 10 through the second through hole 401.

[0149] The connecting rod 7 can be inserted into the spindle body 32, so that the central flow channel, inlet flow channel and outlet flow channel on the rotary joint are connected to the inlet end and outlet end of the central water outlet flow channel and the spindle cooling flow channel, respectively. The rotating ring 8 is fixedly connected to the spindle body 32 by bolts. The connecting rod 7 is sealed to the spindle body 32 by O-ring 20. The cooling sleeve 2 is fixedly connected to the spindle housing by bolts.

[0150] In this embodiment, as Figure 12 As shown, to prevent fluid leakage, the contact parts between the rotary joint and the spindle body 32, the contact parts between the rotary joint and the tail end distribution cooling sleeve 34, and the contact surfaces of the components inside the rotary joint that do not rotate relative to each other are all provided with grooves for installing O-rings 20, so as to facilitate the installation of O-rings 20.

[0151] In this embodiment, as Figure 12 As shown, for ease of processing, a portion of the central water outlet fixed flow channel 101 is machined on the fixed seat 1, while the other portion is machined on the cooling jacket 2; the holes left during processing can be sealed using a ball expansion plug 19.

[0152] In a specific embodiment, such as Figure 12 As shown, the first elastic component is a first spring 12, which is placed between the main body and the first static sealing component 3. The first static sealing component 3 has a plurality of blind holes evenly distributed on it for accommodating the first spring 12.

[0153] The second elastic component is a second spring 13, which is placed between the main body and the second static sealing component 4. The second static sealing component 4 has a plurality of blind holes evenly distributed on it for accommodating the second spring 13.

[0154] In a specific embodiment, it also includes a first guide post 14 and a second guide post 15 fixed to the main body by bolts. The first guide post 14 and the second guide post 15 extend axially along the rotation axis. The first static sealing component 3 is provided with a first guide hole corresponding to the first guide post 14, and the second static sealing component 4 is provided with a second guide hole corresponding to the second guide post 15, so as to perform the guiding function and ensure that the first spring 12 and the second spring 13 can accurately apply axial force.

[0155] In a specific embodiment, it also includes a knife-cylinder assembly, such as... Figure 3 As shown, the cutter cylinder assembly includes a cutter cylinder 27, a cutter disc 28, and a connecting post 29;

[0156] The tool-changing cylinder 27 is fixed on the rear seat 41 of the spindle housing. The tool-changing disc 28 is provided with a through hole that allows the rotary joint to pass through. The piston of the tool-changing cylinder 27 is fixedly connected to the tool-changing disc 28. The tool-changing disc 28 is connected to the pull rod 3102 of the tool-changing mechanism 31 through the connecting column 29. In this embodiment, one end of the connecting column 29 is connected to the tool-changing disc 28 by bolts, and the other end of the connecting column 29 is provided with a threaded part that is threadedly connected to the spindle body 32.

[0157] In this embodiment, the cooling sleeve 34 at the tail end of the rotary joint box is provided with a through hole that allows the connecting post 29 to pass through. The connecting post 29 can slide along the through hole. The piston of the cutting cylinder 27 drives the cutting disc 28 to move axially. The cutting disc 28 drives the pull rod 3102 to move through the connecting post 29 that can slide along the through hole, thereby driving the pull claw 3101 of the cutting mechanism to grab and release the cutting tool at the tool holder 33.

[0158] In a specific embodiment, such as Figure 3 As shown, it also includes a rotary joint extension rod 26, which is fixed to the end of the rotary joint near the spindle by screws. The end of the rotary joint extension rod 26 away from the rotary joint is inserted into the pull rod 3102 to connect with the central water outlet channel 30. A Gladius ring 23 is provided between the rotary joint extension rod 26 and the pull rod 3102 to ensure that the rotary joint extension rod 26 and the pull rod 3102 can reliably seal when the pull rod 3102 follows the connecting column 29 to reciprocate along the axial direction.

[0159] In a specific embodiment, such as Figure 1 As shown, it also includes an encoder gear 25 sleeved on a rotating ring. The spindle housing is provided with a reading head corresponding to the encoder gear 25 to facilitate closed-loop control of the electric spindle. In this embodiment, it also includes an adjustment shim 51, which is sleeved on the rotating ring to ensure the relative position of the encoder gear 25 in the axial direction of the spindle.

[0160] In a specific embodiment, such as Figure 1 As shown, the rear seat 41 of the spindle housing is provided with a maintenance cover 24 to facilitate the maintenance of the rotary joint.

[0161] In a specific embodiment, such as Figure 1 As shown, the rear seat 41 is provided with a spindle cooling inlet pipe 48, a spindle cooling outlet pipe 49 and a central cooling inlet pipe 50 for an external cooling system. The spindle cooling inlet pipe 48, the spindle cooling outlet pipe 49 and the central cooling inlet pipe 50 are respectively connected to the central water outlet fixed flow channel 101, the cooling inlet fixed flow channel 201 and the cooling outlet fixed flow channel 202 through flexible hoses.

[0162] In practical use, both the O-ring 20 and the sealing ring 22 are O-ring seals.

[0163] Example 2

[0164] This embodiment provides an electric spindle with a core cooling system. The main structure of this embodiment is similar to that of Embodiment 1. The difference between this embodiment and Embodiment 1 is as follows:

[0165] In Example 1, the sealing structure 18 is a wear-resistant ring.

[0166] In this embodiment, the sealing structure 18 is a sealing groove, and the flow cross-sectional area of ​​the sealing groove is larger than the flow cross-sectional area of ​​the rotation gap 16, so that the coolant entering the rotation gap 16 from the first distribution chamber C and the coolant entering the rotation gap 16 from the second distribution chamber D can be depressurized after entering the sealing groove, thereby reducing the flow rate of coolant through the rotation gap 16.

[0167] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A shaft core-cooled motorized spindle, characterized by, The application relates to a main shaft shell provided with an external cooling flow channel which flows through the positions where a stator, a front bearing (35) and a rear bearing (36) are arranged on the main shaft shell; a motor (52) comprising a stator and a rotor, wherein the stator is fixed on the main shaft shell and the rotor is sleeved on a mandrel; the mandrel is arranged in the main shaft shell through the front bearing (35) and the rear bearing (36), and a mandrel cooling flow channel which communicates with a rotary joint is arranged in the mandrel and flows through the positions where the rotor, the front bearing (35) and the rear bearing (36) are arranged on the mandrel. The mandrel comprises a mandrel main body (32) and a tool handle seat (33) and a tail end distribution cooling sleeve (34) arranged at two ends of the mandrel main body (32), and the tool handle seat (33) and the tail end distribution cooling sleeve (34) are detachably connected with the mandrel main body (32). The mandrel main body (32) is provided with 2n straight flow channels (3201) which are arranged in a ring array around the axis of the mandrel main body (32), and n is an integer greater than 1. The tool handle seat (33) is provided with n first transition sections (3301) which are arranged in a ring array around the axis of the mandrel main body (32), and each first transition section (3301) corresponds to two straight flow channels (3201).

2. The shaft core-cooled motor spindle according to claim 1, characterized in that The tail end distribution cooling sleeve (34) is provided with n second transition sections (3401) which are arranged in a ring array around the axis of the mandrel main body (32), each second transition section (3401) corresponds to two straight flow channels (3201), and two second transition sections (3401) are provided with an interface flow channel (3402) which communicates with a rotary joint. The first transition section (3301), the second transition section (3401) and the straight flow channel (3201) are in communication with each other to form the mandrel cooling flow channel. The tail end distribution cooling sleeve (34) is inserted into the mandrel main body (32), the mandrel main body (32) is provided with a first flow channel (3202) which is formed along the radial direction of the mandrel main body (32), and the straight flow channel (3201) is communicated with the second transition section (3401) through the first flow channel (3202). The first transition section (3301) is located on the end face of the tool handle seat (33) which is close to the mandrel main body (32), and a sealing ring (22) is arranged between the first transition section (3301) and the mandrel main body (32). The tail end distribution cooling sleeve (34) is inserted into one end of the mandrel main body (32) to form an insertion end, the second transition section (3401) is located on the outer periphery of the insertion end, two sealing rings (22) are sleeved on the insertion end, and the second transition section (3401) is located between the two sealing rings (22).

3. The shaft core-cooled electric spindle according to claim 2, characterized in that The application further comprises a broach mechanism (31) arranged in the mandrel, and the broach mechanism (31) is provided with a central water outlet flow channel (30) which communicates with a rotary joint.

4. The shaft core-cooled electric spindle according to claim 3, characterized in that, The rotary joint comprises: ​ 5. The shaft core cooled electric spindle of claim 1, wherein, ​ 6. The shaft core cooled electric spindle according to claim 5, characterized in that ​ A fixed part fixed on the main shaft housing, comprising a main body, a first static sealing part (3) and a second static sealing part (4), the first static sealing part (3) and the second static sealing part (4) are floatingly but not rotatably assembled on the main body, the main body is provided with a central water outlet fixed flow channel (101), a cooling inlet fixed flow channel (201) and a cooling outlet fixed flow channel (202); A rotating shaft fixed on the mandrel, rotatably assembled on the main body, the rotating shaft is provided with a central water outlet rotating flow channel (701), a cooling inlet rotating flow channel (702) and a cooling outlet rotating flow channel (10); The central water outlet rotating flow channel (701) is communicated with the central water outlet flow channel (30), the cooling inlet rotating flow channel (702) is communicated with the inlet end of the mandrel cooling flow channel, and the cooling outlet rotating flow channel (10) is communicated with the outlet end of the mandrel cooling flow channel; A first elastic part can provide axial force to drive the first static sealing part (3) to press on the first dynamic sealing end of the rotating shaft, so that the end of the first static sealing part (3) and the end of the first dynamic sealing end are attached to form a contact seal, so that the central water outlet fixed flow channel (101) and the central water outlet rotating flow channel (701) are communicated, and the cooling inlet fixed flow channel (201) and the cooling inlet rotating flow channel (702) are communicated; A second elastic part can provide axial force to drive the second static sealing part (4) to press on the second dynamic sealing end of the rotating shaft, so that the end of the second static sealing part (4) and the end of the second dynamic sealing end are attached to form a contact seal, so that the cooling outlet fixed flow channel (202) and the cooling outlet rotating flow channel (10) are communicated.

7. The shaft-kern cooled electric spindle according to claim 6, characterized in that The main body is provided with a containing cavity, and the first dynamic sealing end is located in the containing cavity; The first dynamic sealing end divides the containing cavity into a first distribution cavity and a second distribution cavity, the cooling inlet fixed flow channel (201) is communicated with the cooling inlet rotating flow channel (702) through the first distribution cavity, and the cooling outlet fixed flow channel (202) is communicated with the cooling outlet rotating flow channel (10) through the second distribution cavity.

8. The shaft-kern cooled electric spindle according to claim 7, characterized in that A rotating gap (16) is left between the first dynamic sealing end and the inner wall of the main body, the rotating gap (16) is located between the first distribution cavity and the second distribution cavity, the rotating gap (16) is communicated with the first distribution cavity and the second distribution cavity at two ends respectively, and a sealing structure (18) is arranged in the rotating gap (16).

9. The shaft-kern cooled electric spindle according to claim 5, characterized in that A tool breaking cylinder assembly is further included, and the tool breaking cylinder assembly comprises a tool breaking cylinder (27), a tool breaking disc (28) and a connecting column (29); The tool breaking cylinder (27) is fixed on the main shaft housing, the tool breaking disc (28) is provided with a through hole allowing the rotating joint to pass through, a piston of the tool breaking cylinder (27) is fixedly connected with the tool breaking disc (28), and the tool breaking disc (28) is connected with a pull rod (3102) of a pull broach mechanism (31) through the connecting column (29).

10. The shaft core cooled electric spindle according to claim 9, characterized in that A rotary joint extension rod (26) is also included, which is fixed at the end of the rotary joint close to the core shaft, and the end of the rotary joint extension rod (26) away from the rotary joint is inserted into the pull rod (3102) to communicate with the central water outlet flow channel (30), and a Gleeble ring (23) is arranged between the rotary joint extension rod (26) and the pull rod (3102).

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