A spindle structure

Abstract

This invention provides a spindle structure comprising: a pipe disc, a rear end seat, a spindle core, a water-retaining ring, and a rear spindle core end cap. The rear end seat is located on the outer periphery of at least a portion of the spindle core. The pipe disc and the rear end seat are axially spaced apart, and a water-retaining ring is provided between the pipe disc and the rear end seat. At least a portion of the water-retaining ring is located on the outer periphery of at least a portion of the spindle core. The rear spindle core end cap is located at the upper axial end of the spindle core, and its upper end has a receiving cavity. The water-retaining ring has a water outlet hole located below and communicating with the receiving cavity, allowing water in the receiving cavity to be discharged to the outside of the spindle structure through the water outlet hole. According to this invention, water can be effectively prevented from entering the motor at the lower end of the spindle structure, providing a waterproof seal for the motor of the spindle structure and solving the problem of water easily entering the motor of existing electric spindles, causing safety hazards.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of main shaft, in particular to a main shaft structure. BACKGROUND

[0002] In order to reduce the reaction force of the elastic element compressed by the power cylinder of the main shaft during tool changing and to increase the floating tool changing function to improve the accuracy and service life of the main shaft, the complexity of the main shaft structure is increased to realize the floating tool changing function and the waterproof function of the rear end, which is not conducive to the machining of the main shaft parts, and the stability during the floating tool changing process is also higher.

[0003] Patent application No. 202411033621.X proposes a main shaft floating tool changing structure, which moves the entire floating oil cylinder inside the cylinder cover 22. The contact area between the cylinder cover 22 and the cylinder body 41 of the floating oil cylinder is small, which affects the stability of the main shaft during the floating tool changing process. At the same time, the motor wire 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 rear bearing seat 11, which affects the stiffness of the main shaft.

[0004] Patent No. CN 110682142 A proposes a hydraulic floating tool loosening device for an electric spindle, which reduces the reverse tool changing force received by the bearing by hooking the fixed structure on the shaft core from the outside through the tool loosening block 8. Four groups of spring guide rods 701, floating springs 702 and fixed nuts 703 realize the floating displacement of the oil cylinder, but when the oil cylinder is floating, dust, water vapor and other impurities from the outside can enter the main shaft through the gap between the tool loosening block 8 and the oil cylinder support seat 9, increasing the risk of failure of the main shaft.

[0005] Due to the technical problems such as water easily entering the motor in the existing electric spindle, the present application researches and designs a main shaft structure. SUMMARY

[0006] Therefore, the technical problem to be solved by the present application is to overcome the defect that water easily enters the motor in the existing electric spindle, thereby providing a main shaft structure.

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

[0008] The pipeline disc, the rear end seat, the shaft core, the water blocking ring and the rear shaft core end cover, the rear end seat is located at the outer periphery of at least part of the shaft section of the shaft core, the pipeline disc and the rear end seat are arranged axially spaced, and the water blocking ring is arranged between the pipeline disc and the rear end seat, at least part of the structure of the water blocking ring is located at the outer 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, the upper end of the rear shaft core end cover has a containing cavity, the water blocking ring is provided with a water outlet hole, the water outlet hole is located below the containing cavity and can communicate with the containing cavity, so that the water in the containing cavity can be discharged to the outside of the main shaft structure through the water outlet hole.

[0009] In some embodiments,

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

[0011] In some embodiments,

[0012] The water blocking ring includes a first section extending radially by a first predetermined length in the direction of the radially inner side and a second section extending axially upward by a second predetermined length at the radially inner end of the first section, and 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 formed in the water blocking ring, a fifth wire outlet hole is formed in the pipeline disc, the fourth wire outlet hole is located below the fifth wire outlet hole and communicates 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 blocking ring, so that the motor lead wire can be sequentially guided through the fourth wire outlet hole and the fifth wire outlet hole and then guided upward through the fifth wire outlet hole.

[0015] In some embodiments,

[0016] The rear end seat has a rear bearing seat located at the inner periphery of the rear end seat and the outer periphery of the partial structure of the shaft core, and a rear end flange located at the inner periphery of the rear end seat and the outer periphery of the partial structure of the shaft core, the rear end flange being located at the axial upper end of the rear bearing seat, the rear bearing seat being provided with a second wire outlet hole, the rear end flange being provided with a third wire outlet hole, the rear end seat being further 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 being axially arranged, the upper portion of the third wire outlet hole being communicated with the fourth wire outlet hole, and the lower portion of the first wire outlet hole being a motor, the motor lead-out wire being able to be led out from the motor, and sequentially passing 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 from the upper portion of the pipeline disc.

[0017] In some embodiments,

[0018] The rear end seat has a rear bearing seat located at the inner periphery of the rear end seat and the outer periphery of the partial structure of the shaft core, and a rear end flange located at the inner periphery of the rear end seat and the outer periphery of the partial structure of the shaft core, the rear end flange being located at the axial upper end of the rear bearing seat, the rear bearing seat being provided with a second wire outlet hole, the rear end flange being provided with a third wire outlet hole, the rear end seat being further 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 being axially arranged, the upper portion of the third wire outlet hole being communicated with the fourth wire outlet hole, and the lower portion of the first wire outlet hole being a motor, the motor lead-out wire being able to be led out from the motor, and sequentially passing 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 from the upper portion of the pipeline disc.

[0019] In some embodiments,

[0020] The rear end seat has a rear bearing seat located at the inner periphery of the rear end seat and the outer periphery of the partial structure of the shaft core, and a rear end flange located at the inner periphery of the rear end seat and the outer periphery of the partial structure of the shaft core, the rear end flange being located at the axial upper end of the rear bearing seat, the rear bearing seat being provided with a second wire outlet hole, the rear end flange being provided with a third wire outlet hole, the rear end seat being further 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 being axially arranged, the upper portion of the third wire outlet hole being communicated with the fourth wire outlet hole, and the lower portion of the first wire outlet hole being a motor, the motor lead-out wire being able to be led out from the motor, and sequentially passing 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 from the upper portion of the pipeline disc.

[0021] In some embodiments,

[0022] The rear end seat has a rear bearing seat located at the inner periphery of the rear end seat and the outer periphery of the partial structure of the shaft core, and a rear end flange located at the inner periphery of the rear end seat and the outer periphery of the partial structure of the shaft core, the rear end flange being located at the axial upper end of the rear bearing seat, the rear bearing seat being provided with a second wire outlet hole, the rear end flange being provided with a third wire outlet hole, the rear end seat being further 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 being axially arranged, the upper portion of the third wire outlet hole being communicated with the fourth wire outlet hole, and the lower portion of the first wire outlet hole being a motor, the motor lead-out wire being able to be led out from the motor, and sequentially passing 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 from the upper portion of the pipeline disc.

[0023] In some embodiments,

[0024] The rear end seat has a rear bearing seat located at the inner periphery of the rear end seat and the outer periphery of the partial structure of the shaft core, and a rear end flange located at the inner periphery of the rear end seat and the outer periphery of the partial structure of the shaft core, the rear end flange being located at the axial upper end of the rear bearing seat, the rear bearing seat being provided with a second wire outlet hole, the rear end flange being provided with a third wire outlet hole, the rear end seat being further 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 being axially arranged, the upper portion of the third wire outlet hole being communicated with the fourth wire outlet hole, and the lower portion of the first wire outlet hole being a motor, the motor lead-out wire being able to be led out from the motor, and sequentially passing 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 from the upper portion of the pipeline disc.

[0025] In some embodiments,

[0026] The axial lower end of the floating stator extends to the lower part of the structure of the rear shaft core end cover to form a broach ring, which can contact the lower end of the rear shaft core end cover to form a limit when the floating oil cylinder floats.

[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 reset spring is further arranged between the axially opposite parts, and the spring hole of the reset spring is located on the floating stator.

[0029] The main shaft structure provided by the application has the following beneficial effects:

[0030] 1. The application sets the water blocking ring between the pipeline disc and the rear end seat, and the upper end of the rear shaft core end cover is provided with a containing cavity capable of containing water from above, and the water blocking ring is provided with a water outlet hole below the containing cavity and in communication with the containing cavity, so that the water in the containing cavity can be discharged outside 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, and achieving the sealing effect of waterproofing the motor of the main shaft structure, solving the problem that the motor of the electric main shaft is prone to water ingress, causing safety hazards; the application further extends the radial inner end of the water blocking ring to the rear shaft core end cover by a first preset length in the radial inner side and then extends to form a water blocking table, which can cooperate with the rear end locking groove on the rear shaft core end cover to form a clamping, thereby further increasing the sealing length of the water blocking ring to water, and the range from the lower part of the rear shaft core end cover to the water blocking ring can be effectively water-sealed, further preventing water from entering the motor at the lower end of the electric main shaft, and improving the waterproof sealing effect of the motor of the electric main shaft.

[0031] 2. The application further sets the fourth wire outlet hole on the water blocking ring and the fifth wire outlet hole on the pipeline disc, which can be in opposite communication with the first, second and third wire outlet holes below, so as to sequentially lead the motor outgoing wires upwards, and the fourth wire outlet hole and the water outlet hole on the water blocking ring are located at different positions in the circumferential direction, thereby preventing the water outlet from affecting the motor outgoing wires and improving the waterproof effect on the motor outgoing wires.

[0032] 3. The application also sets the constant pressure pre-tightening spring on the rear bearing seat between the lower end and the rear end seat of the rear bearing seat, so that the constant pressure pre-tightening spring is located at the front end of the rear bearing seat (i.e. the end towards the motor), the force of the constant pressure pre-tightening spring is more direct, the transmission chain is reduced, and when the bearing pre-tightening force changes with temperature, the constant pressure pre-tightening spring can react faster to adjust the pre-tightening force of the spring, thereby adjusting the pre-tightening force of the bearing, so that the output force of the machining is more stable; the application also sets 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, which can increase the thickness of the rear bearing seat in limited space, improve the rigidity of the rear bearing seat, and improve the support stability of the rear bearing;

[0033] 4. The application also sets the floating stator, the through channel opened on the floating stator, which can effectively communicate the accommodating cavity on the upper end of the rear shaft core end cover with the water outlet hole on the water retaining ring, form a drainage channel, and improve the waterproof sealing effect of the motor at the lower end of the main shaft structure; the application also extends the limiting ring on the pipeline disc to the outer periphery of the floating oil cylinder to surround the outer periphery of the floating oil cylinder, which can improve the stability of the floating oil cylinder during movement; the drawbar ring structure extending to the lower part of the rear shaft core end cover from the radial inner side below the floating stator can form axial limiting between the floating stator and the rear shaft core end cover, since the floating stator is fixedly connected with the floating oil cylinder, the most part of the reaction force on the bearing can be offset when the floating oil cylinder floats, and the movement stability of the floating oil cylinder is improved. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 is the front view structure diagram of the main shaft structure of the application;

[0035] Figure 2 is the front view structure diagram of the main shaft structure of the application; Figure 1 is the front view structure diagram of the main shaft structure of the application;

[0036] Figure 3 is the front view structure diagram of the main shaft structure of the application; Figure 1 is the front view structure diagram of the main shaft structure of the application;

[0037] Figure 4 is the front view structure diagram of the main shaft structure of the application; Figure 1 is the front view structure diagram of the main shaft structure of the application;

[0038] The reference signs are as follows:

[0039] 1, bushing; 2, motor assembly; 3, shaft core; 4, pull rod assembly; 5, shoulder; 6, rear bearing front spacer ring; 7, constant pressure pre-tightening spring; 8, rear bearing seat; 8-1, second wire outlet hole; 8-2, spring hole; 8-3, first pin hole; 9, rear bearing set; 10, rear end seat; 10-1, spring retainer ring; 10-2, first wire outlet hole; 10-3, cooling groove; 11, rear end flange; 11-1, third wire outlet hole; 11-2, boss; 12, rear end spacer ring; 13, encoder gear; 14, water retaining ring; 14-1, water outlet hole; 14-2, fourth wire outlet hole; 14-3, water retaining platform; 15, rear end nut; 16, rear shaft core end cover; 161, accommodating cavity; 16-1, dynamic balance screw hole; 16-2, rear end locking ring groove; 17, pipeline disc; 17-1, dynamic balance hole; 17-2, fifth wire outlet hole; 17-3, limiting ring; 18, floating stator; 181, conduction channel; 18-1, broach ring; 18-2, limiting platform; 18-3, return spring hole; 18-4, second pin hole; 18-5, water passing hole; 18-6, proximity switch passing groove; 19, return spring; 20, inductive disc; 21, floating oil cylinder; 22, piston; 23, oil cylinder cover; 24, rotary joint; 25, positioning pin. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way limiting on the application or its applications or uses. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work are within the scope of protection of the present application.

[0041] It should be noted that the terms used herein are only intended to describe specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form, unless the context clearly indicates otherwise, and it should also be understood that when the terms "comprise" and / or "include" are used in the specification, there is a feature, step, operation, device, component and / or combination thereof.

[0042] The foregoing is considered as illustrative only of the principles of the application. Further, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the application to the exact construction and practice described. Accordingly, all such variations are intended to be included within the scope of the present application as defined in the following claims, along with full equivalents thereof.

[0043] In the description of the present application, it is to be understood that the orientation or positional relationships indicated by terms such as "front", "back", "up", "down", "left", "right", "lateral", "vertical", "horizontal", "top", "bottom", and the like are generally based on the orientation or positional relationships shown in the drawings, and are merely intended to facilitate the description and simplify the description, and do not indicate or imply that the device or element referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore cannot be construed as limiting the scope of protection of the present application. The orientation terms "inner", "outer" refer to the inner and outer relative to the contour of the components themselves.

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

[0045] In addition, it should be noted that the use of the terms "first", "second", and the like do not have a special meaning, and therefore cannot be construed as limiting the scope of protection of the present application, unless otherwise stated.

[0046] As Figures 1-4As shown, the present application provides a spindle structure (preferably an electric spindle) comprising:

[0047] The pipeline disc 17, the rear end seat 10, the shaft core 3, the water blocking ring 14 and the rear shaft core end cover 16, the rear end seat 10 is located on the outer periphery of at least part of the shaft section of the shaft core 3, the pipeline disc 17 is arranged axially spaced between the rear end seat 10, and the water blocking ring 14 is further arranged between the pipeline disc 17 and the rear end seat 10, at least part of the structure of the water blocking ring 14 is located on the outer periphery of at least part of the structure of the shaft core 3, the rear shaft core end cover 16 is arranged on the axial upper end of the shaft core 3, the rear shaft core end cover 16 has a containing cavity 161 on the upper end, the water blocking ring 14 is provided with a water outlet hole 14-1, the water outlet hole 14-1 is located below the containing cavity 161 and can communicate with the containing cavity 161, so that the water in the containing cavity 161 can be discharged to the outside of the spindle structure through the water outlet hole 14-1.

[0048] The present application can accommodate water from above by arranging the water blocking ring between the pipeline disc and the rear end seat, and arranging the containing cavity on the upper end of the rear shaft core end cover, and arranging the water outlet hole on the water blocking ring, the water outlet hole is located below the containing cavity and communicates with the containing cavity, so that the water in the containing cavity can be discharged to the outside of the spindle structure through the water outlet hole, effectively preventing water from entering the motor at the lower end of the spindle structure, playing a sealing role of waterproofing the motor of the spindle structure, solving the problem that the motor of the electric spindle is prone to water ingress in the prior art, causing safety hazards.

[0049] In some embodiments,

[0050] The radial inner end of the water blocking ring 14 extends radially inward by a first predetermined length and then extends in the direction of the rear shaft core end cover 16 by a second predetermined length to form a water blocking platform 14-3, the rear end locking ring groove 16-2 is formed on the surface of the rear shaft core end cover 16 opposite to the end of the water blocking platform 14-3, and the end of the water blocking platform 14-3 can be inserted into the rear end locking ring groove 16-2 to form a clamping connection.

[0051] The present application further forms a clamping connection by the water blocking platform formed by the radial inner end of the water blocking ring extending radially inward by a first predetermined length and then extending in the direction of the rear shaft core end cover, so as to further increase the sealing length of the water blocking ring to water, and the range from the lower end of the rear shaft core end cover to the water blocking ring can be effectively sealed, further preventing water from entering the motor at the lower end of the electric spindle, and improving the waterproof sealing effect of the motor of the electric spindle.

[0052] When the rotary joint 24 on the main shaft leaks, the leaked water falls on the induction disc 20 and flows to the rear shaft core end cover 16, and then is collected in the water retaining ring 14 through the water passage 18-5. The water retaining platform 14-3 on the water retaining ring 14 is higher and forms a labyrinth seal with the rear shaft core end cover 16, so that the leaked water is difficult to pass through the water retaining platform 14-3, and finally the leaked water is collected in the water retaining ring 14 and discharged out of the main shaft through the water outlet 14-1.

[0053] In some embodiments,

[0054] The water retaining ring 14 includes a first segment extending radially by a first preset length in a direction towards the radial inner side, and a second segment extending axially upwards by a second preset length at a radial inner end of the first segment. The rear end locking ring groove 16-2 is a groove extending axially upwards from a lower end surface of the rear shaft core end cover 16.

[0055] This is a further preferred structure of the water retaining ring of the present application, that is, the first segment of the water retaining ring extends in a radial direction towards the radial inner side, the second segment extends in an axial direction at an end of the second segment towards the rear shaft core end cover, and the rear end locking ring groove extends in an axial direction and can be engaged with the second segment, thereby improving the water sealing length of the water retaining ring and the effect of water sealing.

[0056] The water retaining ring 14 of the present application is preferably installed on the rear end seat 10, and the water retaining ring 14 and the rear end seat 10 are provided with sealing rings at positioning surfaces. The rear shaft core end cover 16 is installed at the rear end of the shaft core 3 and presses the rear end nut 15, so that the rear end nut 15 is prevented 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 disc 17 is installed on the water retaining ring 14, and the pipeline disc 17 and the water retaining ring 14 are provided with sealing rings at positioning surfaces. The floating stator 18 is positioned by the positioning pin 25 and installed on the floating oil cylinder 21, and is positioned by the limiting platform 18-2 and the floating oil cylinder 21. The limiting platform 18-2 and the pipeline disc 17 are provided with return springs 19. A plurality of return spring holes 18-3 are arranged on the limiting platform 18-2. The drawbar ring 18-1 on the floating stator 18 is below the rear shaft core end cover 16 and has a gap. A plurality of water passages are provided on the floating stator 18, one of which, the water passage 18-5, is aligned with the dynamic balance hole 17-1 (threaded hole) on the pipeline disc 17. The dynamic balance hole 17-1 is radially arranged on the rear shaft core end cover 16. When the main shaft is dynamically balanced, the dynamic balance hole 17-1 is adjusted by screwing a screw through the pipeline disc 17 and the floating stator 18 into the dynamic balance hole 17-1 on the rear shaft core end cover 16.

[0057] In some embodiments,

[0058] The water blocking ring 14 is provided with a fourth wire outlet hole 14-2, the pipeline disc 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 communicates with 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 blocking ring 14, so that the motor lead can be sequentially guided through the fourth wire outlet hole 14-2 and the fifth wire outlet hole 17-2 and then guided upwards through the fifth wire outlet hole 17-2.

[0059] The fourth wire outlet hole on the water blocking ring and the fifth wire outlet hole on the pipeline disc can be in opposite communication with the first, second and third wire outlet holes below, so that the motor lead can be sequentially guided upwards, the fourth wire outlet hole and the water outlet hole on the water blocking ring are located at different circumferential positions, so as to prevent the water from affecting the motor lead and improve the waterproof effect on the motor lead.

[0060] In some embodiments,

[0061] The rear bearing seat 8 is located on the inner periphery of the rear end seat 10 and on the outer periphery of the partial structure of the shaft core 3, the rear end flange 11 is located on the inner periphery of the rear end seat 10 and on the outer periphery of the partial structure of the shaft core 3, the rear end flange 11 is located on the axial upper end of the rear bearing seat 8, the rear bearing seat 8 is provided with a second wire outlet hole 8-1, the rear end flange 11 is provided with a third wire outlet hole 11-1, the rear end seat 10 is further provided with a first wire outlet hole 10-2 below the lower end of the second wire outlet hole 8-1, the first wire outlet hole 10-2, the second wire outlet hole 8-1 and the third wire outlet hole 11-1 are all arranged in axial opposite, the upper side of the third wire outlet hole 11-1 communicates with the fourth wire outlet hole 14-2, the lower side of the first wire outlet hole 10-2 is a motor, the motor lead can be guided from the motor, sequentially 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 and then guided from the upper side of the pipeline disc 17.

[0062] This is a further preferred structure of the application, the rear bearing seat can support the rear bearing, the second wire outlet hole on the rear bearing seat can be in axial opposite and communication 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 below can be guided through the first, second and third wire outlet holes and then guided to the upper side of the pipeline disc through the fourth wire outlet hole of the water blocking ring and the fifth wire outlet hole of the pipeline disc, the external part of the main shaft structure, so as to prevent the motor lead from being eroded by water and improve the waterproof effect on the motor lead.

[0063] The motor assembly 2 of the present application is wired out through a first wiring hole 10-2 on the rear end seat 10, a second wiring hole 8-1 on the rear bearing seat 8, a third wiring hole 11-1 on the rear end flange 11, a fourth wiring hole 14-2 on the water baffle 14 and a fifth wiring hole 17-2 on the pipeline disc 17 in sequence, the fourth wiring hole 14-2 on the water baffle 14 is communicated with the fifth wiring hole 17-2, and the water baffle 14 between the pipeline disc 17 and the rear end seat 10 can block the motor wiring hole to prevent water leakage into the motor assembly 2.

[0064] In some embodiments,

[0065] The rear end seat 10 has a spring blocking 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 blocking ring 10-1, and the constant pressure pre-tightening spring 7 is arranged in the spring hole 8-2.

[0066] The present application also sets the constant pressure pre-tightening 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 pre-tightening spring is located at the front end of the rear bearing seat (i.e. the end towards the motor), the force of the constant pressure pre-tightening spring is more direct, the transmission chain is reduced, and when the bearing pre-tightening force changes with temperature, the constant pressure pre-tightening spring can react faster to adjust the pre-tightening force of the spring, thereby adjusting the pre-tightening force of the bearing, and making the output force of the machining more stable.

[0067] The motor assembly 2 of the application is between the shaft sleeve 1 and the shaft core 3, the rear end seat 10 is installed on the end face of the shaft sleeve 1, and the two are provided with sealing rings on the positioning face, the rear bearing seat 8 is positioned by the first pin hole 8-3 opened in the front end and the positioning pin arranged on the spring stop ring 10-1, so that the front end of the rear bearing seat 8 is close to the spring stop ring 10-1 of the rear end seat 10, the spring stop ring 10-1 and the rear bearing seat 8 are provided with the constant-pressure pre-tightening spring 7, a plurality of spring holes 8-2 are arranged on the rear bearing seat 8, 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 set 9 is installed on the rear bearing seat 8, the inner ring of the rear bearing set 9 is positioned by the stop shoulder 5 and the rear bearing front spacer ring 6, and 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 set 9 is positioned by the rear bearing seat, the rear end flange 11 is fixed on the rear end of the rear bearing seat 8, the boss 11-2 on the rear end flange 11 has a gap with the rear end spacer ring 12, the rear end spacer ring 12 is arranged with a triangular groove ring, which has the effect of preventing impurities from entering the rear bearing set 9 with the boss 11-2 on the rear end flange 11, and the rear end flange 11 has a gap with the outer ring of the rear bearing set 9, so that when the rear bearing set 9 is elongated due to heat during operation, the rear bearing seat 8 and the rear end flange 11 move to the front end to compress the positioning pre-tightening spring 7, and since the rear end flange 11 has a gap with the outer ring of the rear bearing set 9, the rear end flange 11 does not contact the outer ring of the rear bearing set 9 when moving, and when the rear bearing set 9 is shortened due to temperature reduction, the positioning pre-tightening spring 7 resets to move the rear bearing seat 8 and the rear end flange 11 to the rear end, so that the pre-tightening force of the rear bearing set 9 is constant during the whole process, the life of the rear bearing set 9 is enhanced, and the positioning pre-tightening spring 7 arranged at the front end of the rear bearing set 9 has the advantage that the rear bearing seat 6 can directly act on the elongation and shortening state of the rear bearing set 9 to the positioning pre-tightening spring 7.

[0068] In some embodiments,

[0069] The rear end seat 10 is provided with a cooling groove 10-3 on the radially inner wall opposite to the rear bearing seat 8.

[0070] The application can increase the thickness of the rear bearing seat, improve the rigidity of the rear bearing seat and enhance the support stability of the rear bearing by arranging the cooling groove on the radially inner wall of the rear end seat instead of the outer wall of the rear bearing seat.

[0071] In some embodiments,

[0072] Further comprising a floating stator 18, at least part of structure of the floating stator 18 is located at the inner periphery of the pipeline disc 17, at least part of structure of the floating stator 18 is located at the outer periphery of the rear shaft core end cover 16, and a through channel 181 is formed on the floating stator 18, the through 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 through channel 181 is communicated with the containing cavity 161, and the radial outer periphery of the through channel 181 is communicated with the water outlet hole 14-1 on the water retaining ring 14.

[0073] The application further comprises the floating stator, the through channel formed on the floating stator, the containing cavity at the upper end of the rear shaft core end cover and the water outlet hole on the water retaining ring are effectively communicated, a water drainage channel is formed, and the waterproof sealing effect of the motor at the lower end of the main shaft structure is improved.

[0074] In some embodiments,

[0075] Further comprising a floating oil cylinder 21, the floating oil cylinder 21 is located at the axial upper end of at least part of structure of the floating stator 18, and the pipeline disc 17 comprises 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 is fully surrounded by the pipeline disc 17.

[0076] The application further comprises the limiting ring on the pipeline disc extending to the outer periphery of the floating oil cylinder, so that the outer periphery of the floating oil cylinder is fully surrounded, and the stability of the floating oil cylinder during movement is improved.

[0077] In some embodiments,

[0078] The axial lower end of the floating stator 18 extends to the lower side of part of structure of the rear shaft core end cover 16 towards the radial inner side, forming a broach ring 18-1, when the floating oil cylinder 21 floats, the broach ring 18-1 can contact the lower end of the rear shaft core end cover 16, forming a limit.

[0079] The application comprises the broach ring structure extending to the lower side of part of structure of the rear shaft core end cover towards the radial inner side below the floating stator, so that the axial limit between the floating stator and the rear shaft core end cover is formed, since the floating stator is fixedly connected with the floating oil cylinder, the most part of reaction force borne by the bearing can be offset when the floating oil cylinder floats, and the movement stability of the floating oil cylinder is improved.

[0080] The water blocking ring added to the rear end of the main shaft can make the main shaft motor wire pass through the water blocking ring after the rear bearing seat, so that the main shaft part is easy to process and the rear end waterproof function is realized, the main shaft floating tool structure is relatively closed, when the oil cylinder floats, the contact area between the floating oil cylinder and the pipeline disc is large, and the impurities such as dust and water vapor in the external environment cannot enter the floating surface, so that the main shaft floating tool running process is more stable, and the rear bearing seat is thickened in the limited space to enhance the rigidity of the rear bearing, and the main shaft rear end structure is more compact.

[0081] In some embodiments,

[0082] At least part of the structure of the pipeline disc 17 is located at the axial upper end of at least part of the structure of the floating stator 18, and a reset spring 19 is further arranged between the axially opposite parts of the two, and the reset spring hole 18-3 of the reset spring 19 is arranged on the floating stator 18.

[0083] The floating oil cylinder 21 and the oil cylinder cover 23 are fixed, the piston 22 is installed in the cavity formed by the floating oil cylinder 21 and the oil cylinder cover 23 to form an oil cylinder assembly, the axial limiting mode of the oil cylinder assembly is that the end surface of the limiting ring 17-3 on the pipeline disc 17 is contacted through the oil cylinder cover, and the pipeline disc is limited through the reset spring 19 on the floating stator 18, the oil cylinder assembly can move axially on the pipeline disc 17 through the floating oil cylinder 21, two sealing rings are arranged between the floating oil cylinder 21 and the pipeline disc 17, the rotary joint 24 is installed on the oil cylinder cover 23, the floating stator 18 is located below the oil cylinder assembly and is directly fixed by the screw passing through the floating oil cylinder 21, the inductive disc 20 of the oil cylinder assembly, the floating stator and the rotary joint is installed at the rear end of the pull rod and is located at the front end of the oil cylinder assembly, when the main shaft tool is punched, the piston 22 moves forward and contacts the inductive disc 20, the piston 22 pushes the inductive disc 20 and the pull rod assembly 4 to move forward to take out the tool, while the piston 22 moves forward, the floating oil cylinder 21 and the oil cylinder cover 23 will be subjected to a counterforce to make the floating oil cylinder 21, the oil cylinder cover 23, the rotary joint 24 and the floating stator 18 move backward, so that the pull rod ring 18-1 contacts the rear shaft core end cover 16, at this time, the reset spring 19 on the floating stator 18 is compressed, the force of the shaft core moving forward brought by the pull rod assembly is offset, so that the bearing on the shaft core is not subjected to force, at this time, the reset spring 19 on the floating stator 18 is compressed, when the main shaft tool is punched, the piston 22 is reset, the rebound of the compressed reset spring makes the floating stator 18, the floating oil cylinder 21, the oil cylinder cover 23 and the rotary joint 24 move forward, until the oil cylinder cover 23 contacts the limiting ring 17-3 on the pipeline disc 17 to stop moving, at this time, the pull rod ring 18-1 on the floating stator 18 is separated from the rear shaft core end cover 16 to complete the main shaft floating tool.

[0084] The above merely describes preferred embodiments of the present application and is not used to limit the present application, and any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application. The above merely describes preferred embodiments of the present application and is not used to limit the present application, and any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A spindle structure, characterized by: The main shaft structure comprises a pipeline disc (17), a rear end seat (10), a shaft core (3), a water blocking ring (14) and a rear shaft core end cover (16), the rear end seat (10) is arranged on the outer periphery of at least a part of the shaft section of the shaft core (3), the pipeline disc (17) is arranged axially between the rear end seat (10) and the water blocking ring (14), and the water blocking ring (14) is arranged on the outer periphery of at least a part of the structure of the shaft core (3), the rear shaft core end cover (16) is arranged on the axial upper end of the shaft core (3), the rear shaft core end cover (16) has a containing cavity (161) on the upper end, the water blocking ring (14) is provided with a water outlet hole (14-1), the water outlet hole (14-1) is arranged below the containing cavity (161) and can communicate with the containing cavity (161), so that the water in the containing cavity (161) can be discharged to the outside of the main shaft structure through the water outlet hole (14-1); The water blocking ring (14) is provided with a fourth wire outlet hole (14-2), and the pipeline disc (17) is provided with a fifth wire outlet hole (17-2), the fourth wire outlet hole (14-2) is arranged below the fifth wire outlet hole (17-2) and communicates with the fifth wire outlet hole (17-2), and the fourth wire outlet hole (14-2) and the water outlet hole (14-1) are arranged at different circumferential positions on the water blocking ring (14), so that the motor lead wire can be guided upwards through the fifth wire outlet hole (17-2) after passing through the fourth wire outlet hole (14-2) and the fifth wire outlet hole (17-2) in sequence.

2. The main shaft structure according to claim 1, wherein: The radially inner end of the water blocking ring (14) extends by a first preset length towards the radially inner side and then extends by a second preset length towards the rear shaft core end cover (16), forming a water blocking platform (14-3), the rear end locking ring groove (16-2) is formed on the surface of the rear shaft core end cover (16) opposite to the end of the water blocking platform (14-3) and recessed away from the water blocking platform (14-3), and the end of the water blocking platform (14-3) can be inserted into the rear end locking ring groove (16-2) to form a clamping connection.

3. The main shaft structure according to claim 2, wherein: The water blocking ring (14) comprises a first section extending radially by a first preset length towards the radially inner side and a second section extending axially upwards by a second preset length from the radially inner end of the first section, and the rear end locking ring groove (16-2) is a groove extending axially upwards from the lower end surface of the rear shaft core end cover (16).

4. The main shaft structure according to claim 1, wherein: ​ The rear bearing seat (8) is located on the inner periphery of the rear end seat (10) and on the outer periphery of the partial structure of the shaft core (3), the rear end flange (11) is located on the inner periphery of the rear end seat (10) and on the outer periphery of the partial structure of the shaft core (3), the rear end flange (11) is located on the axial upper end of the rear bearing seat (8), the rear bearing seat (8) is provided with a second wire outlet hole (8-1), the rear end flange (11) is provided with a third wire outlet hole (11-1), the rear end seat (10) is further provided with a first wire outlet hole (10-2) at the lower end of the second wire outlet hole (8-1), the first wire outlet hole (10-2), the second wire outlet hole (8-1) and the third wire outlet hole (11-1) are relatively arranged along the axial direction, the upper portion of the third wire outlet hole (11-1) is communicated with the fourth wire outlet hole (14-2), and the lower portion of the first wire outlet hole (10-2) is a motor.

5. The spindle structure according to claim 4, characterized in that: The rear end seat (10) has a spring stop 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 stop ring (10-1), and the constant-pressure pre-tightening spring (7) is arranged in the spring hole (8-2).

6. The spindle structure according to claim 4, characterized in that: The rear end seat (10) is provided with a cooling groove (10-3) on the radial inner periphery wall opposite to the rear bearing seat (8), and the cooling groove (10-3) is a groove formed by being provided on the radial inner periphery wall of the rear end seat (10) in a direction away from the radial outside.

7. The spindle structure according to any one of claims 1-6, characterized in that: The floating stator (18) is arranged at least partially on the inner periphery of the pipeline disc (17) and at least partially on the outer periphery of the rear shaft core end cover (16), and the floating stator (18) is provided with a through channel (181) penetrating from the radial outer periphery to the radial inner periphery, the radial inner periphery of the through channel (181) is communicated with the accommodating cavity (161), and the radial outer periphery of the through channel (181) is communicated with the water outlet hole (14-1) of the water blocking ring (14).

8. The spindle structure according to claim 7, characterized in that: Further comprising a floating oil cylinder (21) located at the axial upper end of at least part of the structure of the floating stator (18), the pipeline disc (17) comprises 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 fully surrounded by the pipeline disc (17).

9. The spindle structure according to claim 8, characterized in that: The axial lower end of the floating stator (18) extends to the lower part of the structure of the rear shaft core end cover (16) towards the radial inner side, forming a broach ring (18-1), which can be in contact with the lower end of the rear shaft core end cover (16) when the floating oil cylinder (21) floats, forming a limit.

10. The spindle structure according to claim 8, characterized in that: At least part of the structure of the pipeline disc (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 further arranged between the axially opposite parts of the two, and the return spring hole (18-3) of the return spring (19) is located on the floating stator (18).

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