Main shaft structure

Abstract

The invention provides a main shaft structure which comprises a pipeline disc, a rear end seat, a shaft core, a water retaining ring and a rear shaft core end cover, the rear end seat is located on the periphery of at least part of a shaft section of the shaft core, the pipeline disc and the rear end seat are arranged at intervals in the axial direction, and the water retaining ring is further arranged between the pipeline disc and the rear end seat. At least part of the structure of the water retaining ring is located on the periphery of at least part of the structure of the shaft core, the rear shaft core end cover is arranged at the axial upper end of the shaft core, a containing cavity is formed in the upper end of the rear shaft core end cover, a water outlet hole is formed in the water retaining ring, and the water outlet hole is located below the containing cavity and can be communicated with the containing cavity. Water in the containing cavity can be discharged out of the main shaft structure through the water outlet hole. Water can be effectively prevented from entering the motor at the lower end of the spindle structure, the waterproof sealing effect on the motor of the spindle structure is achieved, and the problem that in the prior art, water easily enters the motor of an electric spindle, and potential safety hazards are caused is solved.

Description

Technical Field

[0001] The invention relates to the technical field of spindles, and in particular to a spindle structure. Background Art

[0002] In order to reduce the reaction force of the elastic element compressed by the power cylinder during the tool changing process, the floating tooling function will be added to improve the spindle accuracy and life. The complexity of the spindle structure will be increased to achieve the floating tooling function and rear-end waterproofing function of the spindle, which is not conducive to the processing of spindle parts. At the same time, higher requirements are put forward for stability during the floating tooling process.

[0003] Patent application number 202411033621.X proposes a spindle floating knife-beating structure, which enables the entire floating cylinder to move on the inside of the cylinder seat cover 22, and the contact area between the cylinder seat cover 22 and the cylinder body 41 of the floating cylinder is small, affecting the stability of the spindle during the floating knife-beating process; at the same time, the motor line passes through the second wire outlet hole 124 in the bearing outer seat 12, which increases the thickness of the bearing outer seat 12, resulting in a thinner thickness of the rear bearing seat 11, affecting the spindle stiffness.

[0004] Patent number CN 110682142 A proposes a hydraulic floating tool loosening device for an electric spindle, which reduces the reverse tool hitting force received by the bearing by hooking the fixed structure on the shaft core from the outside through the tool loosening block 8, and realizes the floating displacement of the cylinder by four groups of spring guide rods 701, floating springs 702 and fixed nuts 703. However, when the cylinder floats, impurities such as dust and water vapor from the outside can enter the interior of the spindle through the gap between the tool loosening block 8 and the cylinder support seat 9, increasing the risk of spindle failure.

[0005] Since the electric spindle in the prior art has technical problems such as water easily entering the inside of the motor, the present invention studies and designs a spindle structure. Summary of the invention

[0006] Therefore, the technical problem to be solved by the present invention is to overcome the defect of the electric spindle in the prior art that water can easily enter the inside of the motor, thereby providing a spindle structure.

[0007] In order to solve the above problems, the present invention provides a main shaft structure, which includes:

[0008] A pipeline disc, a rear end seat, an axle core, a water retaining ring and a rear axle core end cover, wherein the rear end seat is located at the outer periphery of at least part of the axle section of the axle core, the pipeline disc and the rear end seat are axially spaced, and the water retaining ring is also arranged between the pipeline disc and the rear end seat, at least part of the structure of the water retaining ring is located at the outer periphery of at least part of the structure of the axle core, the rear axle core end cover is arranged at the axial upper end of the axle core, the upper end of the rear axle core end cover has a accommodating cavity, and a water outlet hole is arranged on the water retaining ring, the water outlet hole is located below the accommodating cavity and can be communicated with the accommodating cavity, so that the water in the accommodating cavity can be discharged to the outside of the main shaft structure through the water outlet hole.

[0009] In some embodiments,

[0010] The radial inner end of the water retaining ring extends radially inward by a first preset length and then extends a second preset length in the direction of the rear shaft core end cover to form a water retaining platform. The surface of the rear shaft core end cover opposite to the end of the water retaining platform is recessed in a direction away from the water retaining platform to form a rear end locking ring groove, and the end of the water retaining platform can be inserted into the rear end locking ring groove to form a snap connection.

[0011] In some embodiments,

[0012] The water retaining ring includes a first section radially extending a first preset length in the radially inward direction and a second section extending axially upward a second preset length at the radial inner end of the first section. The rear end locking ring groove is a groove extending axially upward from the lower end surface of the rear shaft core end cover.

[0013] In some embodiments,

[0014] A fourth wire outlet hole is provided on the water retaining ring, and a fifth wire outlet hole is provided on the pipe plate. The fourth wire outlet hole is located below the fifth wire outlet hole and is connected with the fifth wire outlet hole. The fourth wire outlet hole and the water outlet hole are located at different circumferential positions on the water retaining ring, so that the motor lead wire can pass through the fourth wire outlet hole and the fifth wire outlet hole in sequence and then be led out upward through the fifth wire outlet hole.

[0015] In some embodiments,

[0016] The rear end flange is located at the inner periphery of the rear end seat and at the outer periphery of the partial structure of the shaft core, the rear end flange is located at the inner periphery of the rear end seat and at the outer periphery of the partial structure of the shaft core, the rear end flange is located at the axial upper end of the rear bearing seat, the rear bearing seat is provided with a second wire outlet hole, the rear end flange is provided with a third wire outlet hole, and the rear end seat is provided with a first wire outlet hole at the lower end of the second wire outlet hole, the first wire outlet hole, the second wire outlet hole and the third wire outlet hole are all arranged opposite to each other in the axial direction, the upper part of the third wire outlet hole is connected with the fourth wire outlet hole, the lower part of the first wire outlet hole is a motor, the motor lead wire can be led out from the motor, and pass through the first wire outlet hole, the second wire outlet hole, the third wire outlet hole, the fourth wire outlet hole and the fifth wire outlet hole in sequence upward, and then lead out from the upper part of the pipeline disk.

[0017] In some embodiments,

[0018] It also includes a constant pressure preload spring, the rear end seat has a spring retaining ring extending to the axial lower end of the rear bearing seat, the axial lower end of the rear bearing seat is provided with a spring hole in a direction away from the spring retaining ring, and the constant pressure preload spring is arranged in the spring hole.

[0019] In some embodiments,

[0020] A cooling groove is provided on the radial inner peripheral wall of the rear end seat opposite to the rear bearing seat. The cooling groove is a groove formed on the radial inner peripheral wall of the rear end seat and opened toward the radial outer side.

[0021] In some embodiments,

[0022] It also includes a floating stator, at least part of the structure of the floating stator is located on the inner periphery of the pipe plate, at least part of the structure of the floating stator is located on the outer periphery of the rear shaft core end cover, and a conducting channel is opened on the floating stator, the conducting channel runs from the radial outer periphery of the floating stator to its radial inner periphery, the radial inner periphery of the conducting channel is connected to the accommodating cavity, and the radial outer periphery of the conducting channel is connected to the water outlet hole on the water retaining ring.

[0023] In some embodiments,

[0024] It also includes a floating cylinder, which is located at the axial upper end of at least part of the structure of the floating stator. The pipeline plate includes a limiting ring extending to the outer periphery of the floating cylinder, so that the outer periphery of the floating cylinder can be completely surrounded by the pipeline plate.

[0025] In some embodiments,

[0026] The axial lower end of the floating stator extends radially inward to below a partial structure of the rear shaft core end cover to form a broaching ring. When the floating cylinder floats, the broaching ring can contact the lower end of the rear shaft core end cover to form a limit.

[0027] In some embodiments,

[0028] At least part of the structure of the pipeline disc is located at the axial upper end of at least part of the structure of the floating stator, and a return spring is arranged between the axially opposite parts of the two, and the spring hole for setting the return spring is located on the floating stator.

[0029] A main shaft structure provided by the present invention has the following beneficial effects:

[0030] 1. The present invention provides a water retaining ring structure between the pipeline plate and the rear end seat, and the upper end of the rear shaft core end cover is provided with a receiving cavity, which can accommodate water from above, and a water outlet hole is provided on the water retaining ring, the water outlet hole is located below the receiving cavity and is connected with the receiving cavity, so that the water in the receiving cavity can be discharged to the outside of the main shaft structure through the water outlet hole, effectively preventing water from entering the motor at the lower end of the main shaft structure, playing a role in sealing the motor of the main shaft structure waterproof, and solving the problem that the motor of the electric spindle in the prior art is easy to enter the water, causing safety hazards; the present invention further extends the radial inner end of the water retaining ring to extend a first preset length toward the radial inner side and then extends toward the direction of the rear shaft core end cover to form a water retaining platform, which can cooperate with the rear end locking groove on the rear shaft core end cover to form a snap connection, thereby further increasing the sealing length of the water retaining ring for water, and making the range from the bottom of the rear shaft core end cover to the water retaining ring can be effectively water-conducting and sealed, further preventing water from entering the motor at the lower end of the electric spindle, and improving the waterproof sealing effect of the electric spindle motor;

[0031] 2. The present invention further enables relative communication with the first, second and third outlet holes below through the fourth outlet hole on the water retaining ring and the fifth outlet hole on the pipe plate, so that the motor lead wires are led out upward in sequence. The fourth outlet hole and the outlet holes on the water retaining ring are located at different positions in the circumferential direction, thereby preventing the outlet water from affecting the motor lead wires and improving the waterproof effect on the motor lead wires.

[0032] 3. The present invention also arranges the constant pressure preload spring on the rear bearing seat between the lower end of the rear bearing seat and the rear end seat, so that the constant pressure preload spring is located at the front end of the rear bearing seat (i.e., the end facing the motor), and the force of the constant pressure preload spring is more direct, reducing the transmission chain. When the bearing preload force is affected by temperature changes, the constant pressure preload spring can react faster to adjust the preload force of the spring, thereby adjusting the preload force on the bearing, which can make the processing output force more stable; the present invention also arranges the cooling groove on the rear bearing seat on the radial inner wall of the rear end seat instead of the outer peripheral wall of the rear bearing seat, so that the thickness of the rear bearing seat can be increased within a limited space, the rigidity of the rear bearing seat can be improved, and the support stability of the rear bearing can be improved;

[0033] 4. The present invention also provides a floating stator, and the conducting channel opened on it can effectively connect the accommodating cavity at the upper end of the rear shaft core end cover with the water outlet hole on the water retaining ring to form a drainage channel, thereby improving the waterproof sealing effect of the motor at the lower end of the main shaft structure; the present invention also extends the limit ring on the pipeline plate to the outer periphery of the floating oil cylinder to completely surround the outer periphery of the floating oil cylinder, thereby improving the stability of the floating oil cylinder during movement; through the broaching ring structure extending radially inward from the bottom of the floating stator to the bottom of the rear shaft core end cover structure, an axial limit can be formed between the floating stator and the rear shaft core end cover. Since the floating stator is fixedly connected to the floating oil cylinder, most of the reaction force on the bearing can be offset when the floating oil cylinder floats, thereby improving the movement stability of the floating oil cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a front cross-sectional structural diagram of the main shaft structure of the present invention;

[0035] Figure 2 yes Figure 1 A three-dimensional structural diagram of the water retaining ring;

[0036] Figure 3 yes Figure 1 A three-dimensional structural diagram of the rear bearing seat in FIG.

[0037] Figure 4 yes Figure 1 The three-dimensional structure diagram of the floating stator.

[0038] The reference numerals are:

[0039] 1. Bushing; 2. Motor assembly; 3. Shaft core; 4. Tie rod assembly; 5. Shoulder; 6. Rear bearing front spacer; 7. Constant pressure preload spring; 8. Rear bearing seat; 8-1. Second outlet hole; 8-2. Spring hole; 8-3. First pin hole; 9. Rear bearing assembly; 10. Rear seat; 10-1. Spring retaining ring; 10-2. First outlet hole; 10-3. Cooling groove; 11. Rear flange; 11-1. Third outlet hole; 11-2. Boss; 12. Rear spacer; 13. Encoder gear; 14. Water retaining ring; 14-1. Water outlet hole; 14-2. Fourth outlet hole; 14-3. Water retaining platform; 15. Rear Nut; 16, rear shaft core end cover; 161, accommodating chamber; 16-1, dynamic balancing screw hole; 16-2, rear end locking ring groove; 17, pipeline plate; 17-1, dynamic balancing hole; 17-2, fifth outlet hole; 17-3, limit ring; 18, floating stator; 181, conduction channel; 18-1, broaching ring; 18-2, limit platform; 18-3, reset spring hole; 18-4, second pin hole; 18-5, water hole; 18-6, proximity switch slot; 19, reset spring; 20, induction plate; 21, floating cylinder; 22, piston; 23, cylinder cover; 24, swivel joint; 25, positioning pin. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0042] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, numerical expressions and numerical values ​​do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0043] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0044] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0045] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0046] like Figure 1-4As shown, the present invention provides a spindle structure (preferably an electric spindle), which includes:

[0047] A pipeline disc 17, a rear end seat 10, an axle core 3, a water retaining ring 14 and a rear axle core end cover 16, wherein the rear end seat 10 is located at the periphery of at least part of the axial section of the axle core 3, the pipeline disc 17 and the rear end seat 10 are axially spaced, and the water retaining ring 14 is also arranged between the pipeline disc 17 and the rear end seat 10, at least part of the structure of the water retaining ring 14 is located at the periphery of at least part of the structure of the axle core 3, the rear axle core end cover 16 is arranged at the axial upper end of the axle core 3, the upper end of the rear axle core end cover 16 has a accommodating cavity 161, and a water outlet hole 14-1 is arranged on the water retaining ring 14, the water outlet hole 14-1 is located below the accommodating cavity 161 and can be communicated with the accommodating cavity 161, so that the water in the accommodating cavity 161 can be discharged to the outside of the main shaft structure through the water outlet hole 14-1.

[0048] The present invention arranges a water retaining ring structure between the pipeline plate and the rear end seat, and an accommodating cavity is arranged at the upper end of the rear shaft core end cover, which can accommodate water from above, and a water outlet hole is arranged on the water retaining ring, and the water outlet hole is located below the accommodating cavity and is connected with the accommodating cavity, so that the water in the accommodating cavity can be discharged to the outside of the main shaft structure through the water outlet hole, effectively preventing water from entering the motor at the lower end of the main shaft structure, playing a waterproof sealing role for the motor of the main shaft structure, and solving the problem that the motor of the electric spindle is easily infiltrated with water in the prior art, causing safety hazards.

[0049] In some embodiments,

[0050] The radial inner end of the water retaining ring 14 extends radially inward by a first preset length and then extends a second preset length in the direction of the rear shaft core end cover 16 to form a water retaining platform 14-3. The surface of the rear shaft core end cover 16 opposite to the end of the water retaining platform 14-3 is recessed in a direction away from the water retaining platform 14-3 to form a rear end locking ring groove 16-2. The end of the water retaining platform 14-3 can be inserted into the rear end locking ring groove 16-2 to form a snap connection.

[0051] The present invention further forms a water retaining platform by extending the radial inner end of the water retaining ring radially inward by a first preset length and then extending in the direction of the rear shaft core end cover, which can cooperate with the rear end locking groove on the rear shaft core end cover to form a snap connection, thereby further increasing the sealing length of the water retaining ring to water, and allowing the range from the bottom of the rear shaft core end cover to the water retaining ring to be effectively water-conducting and sealed, further preventing water from entering the motor at the lower end of the electric spindle, thereby improving the waterproof sealing effect of the electric spindle motor.

[0052] When the rotary joint 24 on the main shaft leaks, the leaked water falls onto the induction disk 20 and flows to the rear shaft core end cover 16, and is collected in the water retaining ring 14 through the water hole 18-5. The water retaining platform 14-3 on the water retaining ring 14 is relatively high and forms a labyrinth seal with the rear shaft core end cover 16. It is difficult for the leaked water to pass through the water retaining platform 14-3. Finally, the leaked water collected in the water retaining ring 14 is discharged out of the main shaft through the outlet 14-1.

[0053] In some embodiments,

[0054] The water retaining ring 14 includes a first section radially extending inwardly in the radial direction with a first preset length and a second section extending axially upwardly in the radial inner end of the first section with a second preset length. The rear end locking ring groove 16-2 is a groove extending axially upwardly from the lower end surface of the rear shaft core end cover 16.

[0055] This is a further preferred structural form of the water retaining ring of the present invention, that is, the first section of the water retaining ring is a structure extending radially inwardly in the radial direction, the second section is a structure extending axially in the direction of the rear shaft core end cover at the end of the second section, and the rear end locking ring groove is a groove extending in the axial direction, which can be snap-fitted with the second section, thereby increasing the waterproof sealing length of the water retaining ring and improving the waterproof sealing effect.

[0056] The water retaining ring 14 of the present invention is preferably installed on the rear end seat 10, and the positioning surfaces of the water retaining ring 14 and the rear end seat 10 are provided with sealing rings. The rear shaft core end cover 16 is installed at the rear end of the shaft core 3, and the rear shaft core end cover 16 presses the rear end nut 15 to prevent the rear end nut 15 from loosening. The water retaining platform 14-3 on the water retaining ring 14 is embedded in the rear end locking ring groove 16-2 on the rear shaft core end cover 16 to form a labyrinth seal, and there is a gap between the water retaining platform 14-3 and the rear end locking ring groove 16-2. The pipeline plate 17 is installed on the water retaining ring 14, and the pipeline plate 17 and the positioning surfaces of the water retaining ring 14 are provided with sealing rings. The floating stator 18 is positioned by the positioning pin 25 and installed on the floating oil cylinder 21, and is positioned by the limit platform 18-2 and the The floating cylinder 21 is used for positioning, and the limit platform 18-2 and the pipeline plate 17 are provided with a reset spring 19. A plurality of reset spring holes 18-3 are arranged on the limit platform 18-2. The broaching ring 18-1 on the floating stator 18 is located below the rear shaft core end cover 16 with a gap. A plurality of water holes are opened on the floating stator 18, and one of the water holes 18-5 is aligned with the dynamic balancing hole 17-1 (threaded hole) on the pipeline plate 17. The dynamic balancing holes 17-1 are radially arranged on the rear shaft core end cover 16. When the rear end of the spindle assembly is adjusted for dynamic balancing, the adjustment is performed by screwing the screws through the pipeline plate 17 and the floating stator 18 into the dynamic balancing hole 17-1 on the rear shaft core end cover 16.

[0057] In some embodiments,

[0058] The water retaining ring 14 is provided with a fourth wire outlet hole 14-2, and the pipe plate 17 is provided with a fifth wire outlet hole 17-2. The fourth wire outlet hole 14-2 is located below the fifth wire outlet hole 17-2 and is connected to the fifth wire outlet hole 17-2. The fourth wire outlet hole 14-2 and the water outlet hole 14-1 are located at different circumferential positions on the water retaining ring 14, so that the motor lead wire can pass through the fourth wire outlet hole 14-2 and the fifth wire outlet hole 17-2 in sequence and then be led out upward through the fifth wire outlet hole 17-2.

[0059] The present invention further enables relative communication with the first, second and third wire outlet holes below through the fourth wire outlet hole on the water retaining ring and the fifth wire outlet hole on the pipe plate, thereby leading the motor lead wires upward in sequence. The fourth wire outlet hole and the water outlet holes on the water retaining ring are located at different positions in the circumferential direction, thereby preventing the outlet water from affecting the motor lead wires and improving the waterproof effect on the motor lead wires.

[0060] In some embodiments,

[0061] It also includes a rear bearing seat 8 and a rear end flange 11, the rear bearing seat 8 is located at the inner periphery of the rear end seat 10 and at the outer periphery of the partial structure of the shaft core 3, the rear end flange 11 is located at the inner periphery of the rear end seat 10 and at the outer periphery of the partial structure of the shaft core 3, the rear end flange 11 is located at the axial upper end of the rear bearing seat 8, the rear bearing seat 8 is provided with a second outlet hole 8-1, the rear end flange 11 is provided with a third outlet hole 11-1, and the rear end seat 10 is also provided with a first outlet hole 11 at the lower end of the second outlet hole 8-1. 0-2, the first outlet hole 10-2, the second outlet hole 8-1 and the third outlet hole 11-1 are arranged opposite to each other in the axial direction, the upper part of the third outlet hole 11-1 is connected with the fourth outlet hole 14-2, the lower part of the first outlet hole 10-2 is the motor, the motor lead wire can be led out from the motor, pass through the first outlet hole 10-2, the second outlet hole 8-1, the third outlet hole 11-1, the fourth outlet hole 14-2 and the fifth outlet hole 17-2 in sequence, and then be led out from the upper part of the pipeline plate 17.

[0062] This is a further preferred structural form of the present invention, which can support the rear bearing through the rear bearing seat, and the second wire outlet hole opened on the rear bearing seat can be axially opposite and connected with the third wire outlet hole on the rear end flange and the first wire outlet hole on the rear end seat, so that the motor lead wire below is led out through the first, second and third wire outlet holes, and is led out to the top of the pipeline disk and the outside of the main shaft structure through the fourth wire outlet hole of the water retaining ring and the fifth wire outlet hole of the pipeline disk, thereby preventing the motor lead wire from being corroded by water and improving the waterproof effect on the motor lead wire.

[0063] The wires of the motor assembly 2 of the present invention pass through the first wire outlet hole 10-2 on the rear end seat 10, the second wire outlet hole 8-1 on the rear bearing seat 8, the third wire outlet hole 11-1 on the rear end flange 11, the fourth wire outlet hole 14-2 on the water retaining ring 14 and the fifth wire outlet hole 17-2 on the pipe plate 17 in sequence. The fourth wire outlet hole 14-2 (designed as an inclined hole) on the water retaining ring 14 is connected to the fifth wire outlet hole 17-2. The water retaining ring 14 between the pipe plate 17 and the rear end seat 10 can block the motor wire outlet hole to prevent leaked water from flowing into the motor assembly 2.

[0064] In some embodiments,

[0065] It also includes a constant pressure preload spring 7. The rear end seat 10 has a spring retaining ring 10-1 extending to the axial lower end of the rear bearing seat 8. The axial lower end of the rear bearing seat 8 is provided with a spring hole 8-2 in a direction away from the spring retaining ring 10-1. The constant pressure preload spring 7 is arranged in the spring hole 8-2.

[0066] The present invention also arranges the constant-pressure preload spring on the rear bearing seat between the lower end of the rear bearing seat and the rear end seat, so that the constant-pressure preload spring is located at the front end of the rear bearing seat (i.e., the end facing the motor). The force on the constant-pressure preload spring is more direct, reducing the transmission chain. When the bearing preload force is affected by temperature changes, the constant-pressure preload spring can react more quickly to adjust the spring preload force, thereby adjusting the preload force on the bearing, which can make the processing output force more stable.

[0067] The motor assembly 2 of the present invention is between the shaft sleeve 1 and the shaft core 3, and the rear end seat 10 is installed on the end face of the shaft sleeve 1, and sealing rings are arranged on the positioning surfaces of the two. The rear bearing seat 8 is positioned by a first pin hole 8-3 opened at the front end and a positioning pin arranged on the spring retaining ring 10-1, so that the front end of the rear bearing seat 8 is against the spring retaining ring 10-1 of the rear end seat 10, and a constant pressure preload spring 7 is arranged between the spring retaining ring 10-1 and the rear bearing seat 8. A plurality of spring holes 8-2 are arranged on the rear bearing seat 8, and sealing rings are arranged at the front and rear ends of the cooling groove 10-3 between the rear end seat 10 and the rear bearing seat 8. The rear bearing group 9 is installed on the rear bearing seat 8, and the inner ring of the rear bearing group 9 is positioned by the retaining shoulder 5 and the front spacer ring 6 of the rear bearing, and then the inner ring is locked by the rear end spacer ring 12, the encoder gear 13, and the rear end nut 15. The outer ring of the rear bearing group 9 is positioned by the rear bearing seat, and the rear end flange 11 is fixed to the rear end of the rear bearing seat 8. There is a gap between the boss 11-2 on and the rear end spacer ring 12. The rear end spacer ring 12 is arranged with a triangular groove ring, which has the function of preventing impurities from entering the rear bearing group 9 with the boss 11-2 on the rear end flange 11. There is a gap between the rear end flange 11 and the outer ring of the rear bearing group 9. When the rear bearing group 9 is heated and elongated during operation, the rear bearing seat 8 and the rear end flange 11 will move toward the front end to compress the positioning preload spring 7. Due to the gap between the rear end flange 11 and the outer ring of the rear bearing group 9, the rear end flange 11 can move without contacting the outer ring of the rear bearing group 9. When the temperature of the rear bearing group 9 decreases and shortens, the positioning preload spring 7 is reset to move the rear bearing seat 8 and the rear end flange 11 toward the rear end. During the whole process, the preload force of the rear bearing group 9 is constant, which enhances the service life of the rear bearing group 9. The advantage of arranging the constant pressure preload spring 7 at the front end of the rear bearing group 9 is that the rear bearing seat 6 can directly act on the constant pressure preload spring 7 with the elongated and shortened state of the rear bearing group 9.

[0068] In some embodiments,

[0069] A cooling groove 10 - 3 is provided on the radial inner circumferential wall of the rear end seat 10 opposite to the rear bearing seat 8 . The cooling groove 10 - 3 is a groove formed on the radial inner circumferential wall of the rear end seat 10 and opened toward the radial outside.

[0070] The present invention also increases the thickness of the rear bearing seat within a limited space, improves the rigidity of the rear bearing seat, and enhances the support stability of the rear bearing by opening the cooling groove on the rear bearing seat on the radial inner wall of the rear end seat rather than on the outer peripheral wall of the rear bearing seat.

[0071] In some embodiments,

[0072] It also includes a floating stator 18, at least part of the structure of the floating stator 18 is located on the inner periphery of the pipe plate 17, at least part of the structure of the floating stator 18 is located on the outer periphery of the rear shaft core end cover 16, and a conducting channel 181 is opened on the floating stator 18, the conducting channel 181 runs from the radial outer periphery of the floating stator 18 to its radial inner periphery, the radial inner periphery of the conducting channel 181 is connected to the accommodating cavity 161, and the radial outer periphery of the conducting channel 181 is connected to the water outlet 14-1 on the water retaining ring 14.

[0073] The present invention also arranges a floating stator, and a conducting channel opened thereon can effectively connect the accommodating cavity at the upper end of the rear shaft core end cover with the water outlet hole on the water retaining ring to form a drainage channel, thereby improving the waterproof sealing effect of the motor at the lower end of the main shaft structure.

[0074] In some embodiments,

[0075] It also includes a floating cylinder 21, which is located at the axial upper end of at least part of the structure of the floating stator 18. The pipeline plate 17 includes a limiting ring 17-3 extending to the outer periphery of the floating cylinder 21, so that the outer periphery of the floating cylinder 21 can be completely surrounded by the pipeline plate 17.

[0076] The present invention also extends the limiting ring on the pipeline plate to the outer periphery of the floating oil cylinder to completely surround the outer periphery of the floating oil cylinder, thereby improving the stability of the floating oil cylinder during movement.

[0077] In some embodiments,

[0078] The axial lower end of the floating stator 18 extends radially inward to below a partial structure of the rear shaft core end cover 16 to form a broaching ring 18-1. When the floating cylinder 21 floats, the broaching ring 18-1 can contact the lower end of the rear shaft core end cover 16 to form a limit.

[0079] The present invention forms an axial limit between the floating stator and the rear shaft core end cover by extending radially inward from below the floating stator to below the rear shaft core end cover. Since the floating stator is fixedly connected to the floating cylinder, most of the reaction force on the bearing can be offset when the floating cylinder floats, thereby improving the movement stability of the floating cylinder.

[0080] The water retaining ring added at the rear end of the spindle provided by the present invention can make the output wire of the spindle motor pass through the water retaining ring after passing through the rear bearing seat, so that the spindle parts are easy to process and the rear end waterproof function is realized at the same time. The spindle floating knife structure is relatively closed. When the oil cylinder floats, the contact area between the floating oil cylinder and the pipeline plate is large. At the same time, impurities such as dust and water vapor from the outside cannot enter the floating surface, so that the operation process of the spindle floating knife is more stable; the thickening of the rear bearing seat in a limited space can enhance the rigidity of the rear bearing, and the rear end structure of the spindle is more compact.

[0081] In some embodiments,

[0082] At least part of the structure of the piping disk 17 is located at the axial upper end of at least part of the structure of the floating stator 18 , and a return spring 19 is provided between the axially opposite parts of the two, and a return spring hole 18 - 3 for providing the return spring 19 is located on the floating stator 18 .

[0083] The floating cylinder 21 of the present invention is fixed to the cylinder cover 23, and the piston 22 is installed in the cavity formed by the floating cylinder 21 and the cylinder cover 23 to form a cylinder assembly. The axial limiting method of the cylinder assembly is through the cylinder cover contacting the end face of the limiting ring 17-3 on the pipeline disk 17 and limiting the pipeline disk through the return spring 19 on the floating stator 18. The cylinder assembly can move axially on the pipeline disk 17 through the floating cylinder 21, and two sealing rings are arranged between the floating cylinder 21 and the pipeline disk 17. The rotary joint 24 is installed on the cylinder cover 23. The floating stator 18 is located below the cylinder assembly and is directly fixed through the floating cylinder 21 by screws on the cylinder cover 23. The induction disk 20 of the cylinder assembly, the floating stator and the rotary joint is installed at the rear end of the pull rod and at the front end of the cylinder assembly. When the spindle is cutting, the piston 22 moves forward and contacts the induction disk 20, and the piston 22 pushes the induction disk 20 and The pull rod assembly 4 moves forward to remove the tool. While the piston 22 moves forward, the floating cylinder 21 and the cylinder cover 23 will be subjected to the reaction force to move the floating cylinder 21, the cylinder cover 23, the rotary joint 24 and the floating stator 18 backward, so that the broaching ring 18-1 contacts the rear shaft core end cover 16. At this time, the return spring 19 on the floating stator 18 is compressed, offsetting the forward movement force of the shaft core brought by the pull rod assembly, so that the bearing on the shaft core is not under force. At this time, the return spring 19 on the floating stator 18 is compressed. When the spindle cutting is completed, the piston 22 is reset, and the compressed return spring rebounds to move the floating stator 18, the floating cylinder 21, the cylinder cover 23 and the rotary joint 24 forward until the cylinder cover 23 contacts the limit ring 17-3 on the pipeline plate 17 and stops moving. At this time, the broaching ring 18-1 on the floating stator 18 is separated from the rear shaft core end cover 16 to complete the spindle floating moving tool.

[0084] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention. The above description is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present invention. These improvements and variations should also be regarded as the protection scope of the present invention.

Claims

1. A spindle structure, characterized in that: include: A pipeline disc (17), a rear end seat (10), an axle core (3), a water retaining ring (14) and a rear axle core end cover (16), wherein the rear end seat (10) is located on the outer periphery of at least a portion of the axle section of the axle core (3), the pipeline disc (17) and the rear end seat (10) are arranged with an axial spacing, and the water retaining ring (14) is also arranged between the pipeline disc (17) and the rear end seat (10), and at least a portion of the structure of the water retaining ring (14) is located on at least a portion of the axle core (3). The outer periphery of the main structure, the rear shaft core end cover (16) is arranged at the axial upper end of the shaft core (3), the upper end of the rear shaft core end cover (16) has a accommodating cavity (161), and the water retaining ring (14) is provided with a water outlet hole (14-1), the water outlet hole (14-1) is located below the accommodating cavity (161) and can be communicated with the accommodating cavity (161), so that the water in the accommodating cavity (161) can be discharged to the outside of the main shaft structure through the water outlet hole (14-1).

2. The spindle structure according to claim 1, characterized in that: The radial inner end of the water retaining ring (14) extends radially inward by a first preset length and then extends radially inward by a second preset length in the direction of the rear shaft core end cover (16) to form a water retaining platform (14-3); a surface of the rear shaft core end cover (16) opposite to the end of the water retaining platform (14-3) is recessed in a direction away from the water retaining platform (14-3) to form a rear end locking ring groove (16-2); the end of the water retaining platform (14-3) can be inserted into the rear end locking ring groove (16-2) to form a snap connection.

3. The spindle structure according to claim 2, characterized in that: The water retaining ring (14) comprises a first section extending radially inwardly by a first preset length and a second section extending axially upward by a second preset length at the radial inner end of the first section, and the rear end locking ring groove (16-2) is a groove extending axially upward from the lower end surface of the rear shaft core end cover (16).

4. The spindle structure according to any one of claims 1 to 3, characterized in that: The water retaining ring (14) is provided with a fourth wire outlet hole (14-2), and the pipe plate (17) is provided with a fifth wire outlet hole (17-2). The fourth wire outlet hole (14-2) is located below the fifth wire outlet hole (17-2) and is connected to the fifth wire outlet hole (17-2). The fourth wire outlet hole (14-2) and the water outlet hole (14-1) are located at different circumferential positions on the water retaining ring (14), so that the motor lead wire can pass through the fourth wire outlet hole (14-2) and the fifth wire outlet hole (17-2) in sequence and then be led out upward through the fifth wire outlet hole (17-2).

5. The spindle structure according to claim 4, characterized in that: The invention also comprises a rear bearing seat (8) and a rear end flange (11), wherein the rear bearing seat (8) is located on the inner periphery of the rear end seat (10) and on the outer periphery of a part of the structure of the shaft core (3), and the rear end flange (11) is located on the inner periphery of the rear end seat (10) and on the outer periphery of a part of the structure of the shaft core (3). The rear end flange (11) is located on the axial upper end of the rear bearing seat (8), and a second wire outlet hole (8-1) is provided on the rear bearing seat (8), and a third wire outlet hole (11-1) is provided on the rear end flange (11). The rear end seat (10) is also provided with a first wire outlet hole (8-1) at the lower end thereof. The first wire outlet hole (10-2), the second wire outlet hole (8-1) and the third wire outlet hole (11-1) are arranged opposite to each other along the axial direction, the upper part of the third wire outlet hole (11-1) is connected to the fourth wire outlet hole (14-2), the lower part of the first wire outlet hole (10-2) is a motor, and the motor lead wire can be led out from the motor, pass through the first wire outlet hole (10-2), the second wire outlet hole (8-1), the third wire outlet hole (11-1), the fourth wire outlet hole (14-2) and the fifth wire outlet hole (17-2) in sequence upwards, and then be led out from the upper part of the pipeline disk (17).

6. The main shaft structure according to claim 5, characterized in that: It also includes a constant pressure preload spring (7), the rear end seat (10) has a spring retaining ring (10-1) extending to the axial lower end of the rear bearing seat (8), the axial lower end of the rear bearing seat (8) is provided with a spring hole (8-2) in a direction away from the spring retaining ring (10-1), and the constant pressure preload spring (7) is arranged in the spring hole (8-2).

7. The spindle structure according to claim 5, characterized in that: A cooling groove (10-3) is provided on the radial inner peripheral wall of the rear end seat (10) opposite to the rear bearing seat (8), and the cooling groove (10-3) is a groove formed on the radial inner peripheral wall of the rear end seat (10) and opened toward the radial outside.

8. The spindle structure according to any one of claims 1 to 7, characterized in that: The invention also comprises a floating stator (18), wherein at least part of the structure of the floating stator (18) is located on the inner periphery of the pipe plate (17), and at least part of the structure of the floating stator (18) is located on the outer periphery of the rear shaft core end cover (16), and a conducting channel (181) is provided on the floating stator (18), wherein the conducting channel (181) penetrates from the radial outer periphery of the floating stator (18) to the radial inner periphery thereof, the radial inner periphery of the conducting channel (181) is communicated with the accommodating cavity (161), and the radial outer periphery of the conducting channel (181) is communicated with the water outlet hole (14-1) on the water retaining ring (14).

9. The main shaft structure according to claim 8, characterized in that: It also includes a floating oil cylinder (21), the floating oil cylinder (21) is located at the axial upper end of at least a portion of the structure of the floating stator (18), and the pipeline plate (17) includes a limiting ring (17-3) extending to the outer periphery of the floating oil cylinder (21), so that the outer periphery of the floating oil cylinder (21) can be completely surrounded by the pipeline plate (17).

10. The spindle structure according to claim 9, characterized in that: The axial lower end of the floating stator (18) extends radially inward to below a partial structure of the rear shaft core end cover (16) to form a broaching ring (18-1). When the floating cylinder (21) floats, the broaching ring (18-1) can contact the lower end of the rear shaft core end cover (16) to form a limit position.

11. The main shaft structure according to claim 9, characterized in that: At least part of the structure of the pipeline disk (17) is located at the axial upper end of at least part of the structure of the floating stator (18), and a return spring (19) is also arranged between the axially opposite parts of the two, and the return spring hole (18-3) in which the return spring (19) is arranged is located on the floating stator (18).

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