Multi-sealing protection motorized spindle
By incorporating multiple waterproof mechanisms on the electric spindle, the problem of coolant seeping in along the gaps is solved, achieving sealed protection for the spindle, significantly extending its service life and reducing the repair rate.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-16
- Publication Date
- 2026-04-10
AI Technical Summary
When the existing electric spindle rotates at high speed upwards with the inclined vertical grinding wheel, coolant can easily flow in along the gap between the spindle and the end cover, causing bearing damage, shortening service life, and resulting in a high repair rate.
Multiple waterproof mechanisms are installed on the upper and lower ends and inside and outside of the electric spindle, including dust covers, sealing nuts, sealing rings, inner sealing covers, and inner sealing rings, forming a labyrinth structure and air seal to prevent sewage and dust from entering the spindle.
It effectively prevents sewage and dust from entering the bearing assembly, extends the spindle life, and reduces the rework rate from 30% to 5%.
Smart Images
Figure CN224102674U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to numerical control machine tool technical field, especially relate to a multiple sealing protection's electric main shaft. BACKGROUND
[0002] At present, the general electric main shaft is in operation, and the grinding temperature of the center part is relatively high, and the high grinding temperature can easily cause the thermal deformation of the workpiece, especially in the precision grinding of the workpiece, the precision requirement is high, and the deformation amount is required to be small, if the deformation amount of the workpiece is large, the detection and determination of the size of the workpiece after cooling are affected, and the precision of the workpiece further affects the assembly quality of the whole spindle. For the grinding temperature of the grinding center part, a large amount of cooling liquid is sprayed at the grinding part to reduce the grinding heat through the circulation of the cooling liquid. This environment forms a harsh environment at the front end of the electric main shaft, and a large amount of sewage, dust and water vapor are gathered at the front end of the electric main shaft, which gradually penetrates into the inside of the main shaft through the gap of each part at the front end of the rotating shaft, causing damage to the high-speed pre-rotating bearing, and further reducing the service life of the electric main shaft. At present, the front end of the general electric main shaft adopts a high-pressure gas seal structure and a drainage structure, the high-pressure gas of the machine tool passes through the channel of the high-pressure gas at the front end of the shell, the gas blows from the inside to the outside through the gap, and the cooling liquid and other impurities are prevented from entering the inside of the main shaft. However, if the main shaft is used in the form of an inclined vertical upward sand wheel, the cooling liquid flows downward along the gap between the main shaft and the end cover and the gap between the shell and the matching parts into the inside of the main shaft, the general gas seal structure and drainage structure cannot effectively prevent the penetration, further causing damage to the bearing in operation, and the repair rate of the electric main shaft is high, reaching 30%. SUMMARY
[0003] The utility model provides a multiple sealing protection's electric main shaft in view of the deficiency and defect that exist in prior art electric main shaft sealing technology, through setting up multiple waterproof mechanisms on the upper and lower ends and the inside and outside of the electric main shaft, solve the problem of the main shaft waterproof dust in the inclined vertical sand wheel high speed operation, avoid the damage of the main shaft bearing, improve the service life of the electric main shaft.
[0004] The utility model discloses a technical scheme: a multiple sealing protection electric main shaft is installed to the inclined vertical type upwards, and it is characterized in that: multiple waterproof structures are arranged on the outside and the inside of the electric main shaft, a rotor shaft is arranged in the middle part of the electric main shaft, shaft shoulder structures are arranged on the upper section and the lower end of the rotor shaft and are respectively installed with upper bearing sets and lower bearing sets, the upper bearing sets are sleeved on the inner wall of the upper large lid, and the lower bearing sets are sleeved on the inner wall of the bearing seat, the upper large lid is arranged on the upper end of the shell, the bearing seat is arranged on the lower end of the shell, the dust cover is sleeved on the upper large lid, further, drainage holes are arranged on the circumference of the dust cover in the radial direction, and the lower end cover is arranged on the lower end of the bearing seat.
[0005] Further, the upper section of the rotor shaft is provided with a water throwing groove structure in the circumferential direction, and the water throwing groove structure is arranged on the upper end of the dust cover.
[0006] Further, the upper end of the upper large lid is provided with an upper end cover, an inner sealing cover and an inner sealing ring are arranged between the upper end cover and the upper bearing sets, and the inner sealing cover and the inner sealing ring are provided with matching convex and concave grooves to form a labyrinth structure.
[0007] Further, the upper end cover is provided with an inner step structure to adapt to the installation of a sealing ring, and the sealing ring is sleeved on the outer surface of the rotor shaft; further, the outer surface of the sealing ring is provided with a spiral water throwing groove structure.
[0008] Further, the upper end cover is provided with a radial air duct inside; further, the upper end surface of the upper end cover is provided with matching convex and concave grooves to form a labyrinth structure.
[0009] Further, the gap of the convex and concave grooves is less than or equal to 0.10mm.
[0010] Further, the outer surface of the sealing nut is provided with a water throwing groove structure.
[0011] Further, the contact surface of the upper large lid and the dust cover is provided with an O-shaped groove structure, and an O-shaped ring is adapted and installed in the O-shaped groove.
[0012] Further, the inner side of the contact surface of the bearing seat and the lower end cover is provided with an O-shaped groove structure, and an O-shaped ring is adapted and installed in the O-shaped groove; further, the material of the O-shaped ring is fluorine rubber.
[0013] Further, the bearing seat is provided with an inner step structure to adapt to the installation of a cover; further, sealing glue is applied to the radial gap between the cover and the bearing seat; further, the material of the sealing glue is silicon-based waterproof glue.
[0014] The utility model discloses a beneficial effect is: 1. The outer part of this electric main shaft adopts a sealed waterproof structure, a water flinger is arranged on the upper end of the rotor shaft of the electric main shaft, and a dustproof cover is arranged outside the water flinger, an O-ring is arranged at the joint of the dustproof cover of the electric main shaft and the upper cover, and an O-ring is arranged at the joint of the bearing seat and the lower end cover, so that sewage and dust are prevented from entering the inside of the main shaft, 2. The inside of this electric main shaft adopts a sealed waterproof structure, a water flinger structure of a sealing nut, a labyrinth structure of the sealing nut and the upper end cover, a structure of an inner sealing cover and an inner sealing ring, and an air seal structure of the upper end cover, a cover is arranged at the lower end of the bearing seat and is coated with sealing glue, so that sewage and dust are prevented from entering the bearing set from the inside of the main shaft, sewage, water vapor and dust are effectively prevented from entering the bearing set, the service life of the main shaft is prolonged, and the reliability of the main shaft is improved. BRIEF DESCRIPTION OF DRAWINGS
[0015] Figure 1 It is a kind of multiple sealing protection electric main shaft profile structure schematic diagram.
[0016] Figure 2 It is a kind of multiple sealing protection electric main shaft upper end local enlarged schematic diagram.
[0017] Figure 3 It is a kind of multiple sealing protection electric main shaft rotor shaft structure schematic diagram.
[0018] Figure 4 It is a kind of multiple sealing protection electric main shaft lower end local enlarged schematic diagram.
[0019] Figure 5 It is a kind of multiple sealing protection electric main shaft sealing nut structure schematic diagram.
[0020] In the drawing, 1 is a dustproof cover, 2 is a sealing nut, 3 is a sealing ring, 4 is an upper end cover, 5 is an inner sealing cover, 6 is an inner sealing ring, 7 is an upper bearing set, 8 is an upper cover, 9 is a shell, 10 is a rotor shaft, 11 is a bearing seat, 12 is a lower bearing set, 13 is a nut, 14 is a cover, and 15 is a lower end cover. DETAILED DESCRIPTION
[0021] In order to facilitate the understanding of those skilled in the art, the utility model will be further described below in conjunction with examples and drawings, and the content mentioned in the embodiment is not a limitation on the utility model.
[0022] It needs to be pointed out in advance that in the utility model, unless there is definite stipulation and limitation, the terms "mounting", "connection", "connecting", "fixing" and the like should be understood in a broad sense.For example, it can be fixedly connected, integrally connected, directly connected or detachably connected, etc.For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.
[0023] In the description of the utility model, it is necessary to explain that the terms "upper", "lower", "left", "right", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.
[0024] As Figures 1-5 The utility model discloses a multiple sealing protection's electric main shaft, and the inclined vertical type is set up installation upwards, including dust cover 1, sealing nut 2, sealing ring 3, upper end cover 4, inner sealing cover 5, inner sealing ring 6, upper bearing set 7, upper big lid 8, shell 9, rotor shaft 10, bearing seat 11, lower bearing set 12, nut 13, baffle cover 14, lower end cover 15, through the cooperation between each spare part structure, the multiple waterproof structure is formed on the upper end and lower end of electric main shaft, plays the role of sealing and waterproof, the rotor shaft 10 sets up installation in the middle part of electric main shaft, and the upper section and lower end of this rotor shaft 10 set up shaft shoulder structure and install upper bearing set 7 and lower bearing set 12 respectively, and the axial fixing is carried out through the sealing nut 2 of upper end and the nut 13 of lower end, further, the upper bearing set 7 of upper big lid 8 is sleeved in the inner wall, and the lower bearing set 12 of bearing seat 11 is sleeved in the inner wall, further, the upper big lid 8 sets up installation in the upper end of shell 9, and the bearing seat 11 sets up installation in the lower end of shell 9, and the rotating rotor shaft 10 is supported through upper bearing set 7 in the upper big lid 8 and lower bearing set 12 in bearing seat 11, further, the dust cover 1 sets up and is sleeved in the upper big lid 8, plays the protection effect, further, the circumferential radial of dust cover 1 sets up drain hole, plays the drainage effect, and the lower end cover 12 sets up installation in the lower end of bearing seat 11.
[0025] Further, the upper section circumferential of rotor shaft 10 sets up water flume structure, and when rotor shaft 10 rotates, sewage is thrown out the surface of rotor shaft 10 through water flume structure, and surface sewage enters the gap between dust cover 1 and rotor shaft 10, and the water flume structure sets up in the upper end of dust cover 1.
[0026] Further, the upper end of upper big lid 8 sets up installation upper end cover 4, sets up inner sealing cover 5 and inner sealing ring 6 between upper end cover 4 and upper bearing set 7, the inner sealing cover 7 and inner sealing ring 6 set up mutually matched convex and recessed groove, form the labyrinth structure and play the protection effect, prevent dust and water vapor from entering the inside of upper bearing set 7, prolong the life of upper bearing set 7.
[0027] Further, the upper end cover 4 sets up inner step structure and adapts to install sealing ring 3, the sealing ring 3 is sleeved in the outer surface of rotor shaft 10, the outer surface of this sealing ring 3 sets up spiral water flume structure, plays the sealing protection effect.
[0028] Further, the upper end cover 4 is internally provided with a radial air passage, through which high-pressure gas is blown to the outer surface of the sealing ring 3, forming an air seal between the sealing ring 3 and the gap of the upper end cover 4.
[0029] Further, the upper end cover 4 is provided with a convex and concave groove on the upper end surface, which matches the sealing nut 2 to form a labyrinth structure to prevent dust and water vapor from entering the main shaft.
[0030] Further, the gap of the convex and concave groove is less than or equal to 0.10mm.
[0031] Further, the outer surface of the sealing nut 2 is provided with a water flume structure, which flings the water vapor and dust entering the main shaft to the edge of the sealing nut 2 and the upper end cover, to the inner wall of the dust cover 1, and is discharged to the outside of the main shaft through the water outlet on the inner wall of the dust cover 1.
[0032] Further, the upper large cover 8 is provided with an O-shaped groove structure on the contact surface with the dust cover 1, and an O-ring is fitted in the O-shaped groove to seal the gap between the dust cover 1 and the upper large cover 8.
[0033] Further, the inner side of the contact surface between the bearing seat 11 and the lower end cover 15 is provided with an O-shaped groove structure, and an O-ring is fitted in the O-shaped groove to seal the gap between the bearing seat 11 and the lower end cover 15.
[0034] Further, the material of the O-ring is fluorine rubber, which can withstand temperatures from -20° to 200°.
[0035] Further, the bearing seat 11 is provided with an inner step structure to fit the cover 14, which plays a protective role for the lower bearing set 12; further, the radial gap between the cover 14 and the bearing seat 11 is coated with sealant, which is cured to prevent water vapor and dust from entering the main shaft.
[0036] Further, the sealant is a silicon-based waterproof glue, which is waterproof after curing.
[0037] Working principle: After the electric spindle is started, the rotor shaft 10 rotates at high speed under the electromagnetic action of the stator and rotor parts; in order to reduce the temperature rise of the grinding part, a large amount of cooling liquid is sprayed at the grinding part; the electric spindle is provided with multiple protective structures on the outside, the upper end and the lower end inside, which perform multi-level cooperative sealing protection to prevent sewage and dust from entering the main shaft.
[0038] First, the outer part of the electric spindle is sealed and protected, most of the sewage is blocked by the dust cover 1 arranged at the upper end of the electric spindle, and the sewage on the surface of the rotor shaft 10 is further thrown away by the water throwing groove at the upper end of the rotor shaft 10; further, the O-shaped ring is arranged at the contact surface of the upper large cover 8 and the dust cover 1, which prevents the sewage from entering between the dust cover 1 and the upper large cover 8; the O-shaped ring is arranged at the inner side of the contact surface between the bearing seat 11 and the lower end cover 15, which seals and protects the gap between the bearing seat 11 and the lower end cover 15;
[0039] Second, the inner upper end is sealed and protected, the water vapor and dust entering the interior of the main shaft are thrown to the edge of the sealing nut 2 and the upper end cover 4 through the water throwing groove on the outer surface of the sealing nut 2 and the labyrinth structure of the sealing nut 2 and the upper end cover 4, and are thrown to the inner wall of the dust cover 1 and are discharged to the outside of the main shaft through the water outlet hole arranged on the inner wall of the dust cover 1; at the same time, the high-pressure gas entering the interior of the upper end cover 4 forms an outward air seal between the sealing ring 3 and the upper end cover 4; the labyrinth structure formed by the inner sealing cover 5 and the inner sealing ring 6 arranged at the upper end of the upper bearing set 7 further plays a protective role for the upper bearing set 7;
[0040] Finally, the inner lower end is sealed and protected, the cover 14 arranged at the inner step of the bearing seat 11 plays a protective role for the lower bearing set 12; further, the radial gap between the cover 14 and the bearing seat 11 is coated with sealing glue, which prevents water vapor and dust from entering the interior of the main shaft.
[0041] Technical experiment number: after the electric spindle is sealed and protected by multiple sealing and protection, the repair rate of the main shaft is greatly reduced under the condition of inclined vertical upward installation, and the repair rate of the bearing burned by water is reduced from 30% to 5%.
[0042] The above is an example and should not limit the present application in any way, and any technical solution obtained by equivalent replacement or equivalent conversion falls within the protection scope of the present application.
Claims
1. A multi-sealing protection electric spindle, inclined vertical upward installation, comprising a dust cover, a sealing nut, a sealing ring, an upper end cover, an inner sealing cover, an inner sealing ring, an upper bearing set, an upper large cover, a shell, a rotor shaft, a bearing seat, a lower bearing set, a nut, a cover, and a lower end cover, characterized in that: The electric spindle is externally and internally provided with multiple waterproof structures; the rotor shaft is arranged in the middle of the electric spindle, and upper and lower ends of the rotor shaft are provided with shaft shoulder structures for respectively mounting upper and lower bearing sets; the upper bearing set is sleeved on the inner wall of the upper large cover, and the lower bearing set is sleeved on the inner wall of the bearing seat; the upper large cover is arranged on the upper end of the shell, and the bearing seat is arranged on the lower end of the shell; the dust cover is sleeved on the upper large cover; further, the dust cover is provided with drainage holes in the circumferential direction; the lower end cover is arranged on the lower end of the bearing seat. Further, the upper end of the rotor shaft is provided with a water throwing groove structure; further, the water throwing groove structure is arranged at the upper end of the dust cover.
2. A multi-seal protected electric spindle according to claim 1, characterized in that: The upper end of the upper large cover is provided with an upper end cover, and an inner sealing cover and an inner sealing ring are arranged between the upper end cover and the upper bearing set, and the inner sealing cover and the inner sealing ring are provided with matching convex and concave grooves to form a labyrinth structure.
3. A multi-seal protected electric spindle according to claim 1 or 2, characterized in that: The upper end cover is provided with an inner step structure for fitting a sealing ring, and the sealing ring is sleeved on the outer surface of the rotor shaft; further, the outer surface of the sealing ring is provided with a spiral water throwing groove structure.
4. A multi-seal protected electric spindle according to claim 3, characterized in that: The upper end cover is internally provided with a radial air channel; further, the upper end surface of the upper end cover is provided with matching convex and concave grooves to form a labyrinth structure.
5. A multi-seal protected electric spindle according to claim 2 or 4, characterized in that: The gap of the convex and concave grooves is less than or equal to 0.10 mm.
6. A multi-seal protected electric spindle as claimed in claim 1, characterized in that: The outer surface of the sealing nut is provided with a water throwing groove structure.
7. A multi-seal protected electric spindle as claimed in claim 1, characterized in that: The contact surface of the upper large cover and the dust cover is provided with an O-shaped groove structure, and an O-shaped ring is fitted in the O-shaped groove.
8. A multi-seal protected electric spindle according to claim 1, characterized in that: The inner side of the contact surface of the bearing seat and the lower end cover is provided with an O-shaped groove structure, and an O-shaped ring is fitted in the O-shaped groove; further, the material of the O-shaped ring is fluorine rubber.
9. A multi-seal protected electric spindle according to claim 1 or 8, characterized in that: The bearing seat is provided with an inner step structure for fitting a cover; further, sealing glue is applied to the radial gap between the cover and the bearing seat; further, the material of the sealing glue is silicone waterproof glue.