High-speed spindle cage seal ring

Abstract

The present invention relates to a high-speed spindle cage seal ring, which is composed of a rotary ring and a rotary body auger. The outer circumference of the rotary ring is a special-shaped curved surface with the inner end diameter larger than the outer end; the rotary body auger is composed of a number of auger wires in an inverted seven shape. Every two auger wires form a group. The two auger wires in the same group are respectively arranged at a 45° inclination to the positive and negative directions of the central axis, and every two adjacent groups of auger wires intersect at both end faces of the rotary ring; the overall outer circumference formed by several groups of auger wires is in the shape of a slope with a higher inner end face and a lower outer end face. This seal ring adopts the shape of a cage formed by the cross-connection of inverted seven-shaped positive and negative 45° inclination angles, and can form an air curtain during high-speed rotation to prevent external impurities from infiltrating into the spindle. The specially designed special-shaped curved surface has a certain flow guiding function.

Description

Technical Field

[0001] The present invention relates to a high-speed spindle cage seal ring, belonging to the technical field of functional components of numerical control machine tools. Background Art

[0002] The spindle is the core functional component of a machine tool, and its sealing has always been the focus of research on spindle components. In the design of high-speed spindles, air curtain sealing is often used, but it is relatively dependent on the air source. In particular, the cleanliness and dryness indicators of the air source have a great impact on the sealing effect of the spindle. At present, there is a grooving technology, that is, a groove surface with a specific curve is opened on the rotating body, so that an air flow is formed by using the principle of fan blades during the rotation of the rotating body to play a role in protective sealing. However, it can only be applied in a single rotation direction. In the reverse rotation, it will inhale air backwards, which will instead increase the infiltration of impurities, and there are very great limitations in applying it to the air curtain sealing of the spindle. Moreover, the processing and manufacturing are difficult and the cost is high. The error of the groove part will also affect the dynamic balance of the high-speed spindle. And during the high-speed operation of the spindle, there is a situation of insufficient power in the grooving part, and the air curtain cannot be formed quickly, and there is also a risk of leakage.

[0003] Therefore, a spindle seal with good sealing protection, without an air source, high precision, simple manufacturing, economical price, and not limited by the rotation direction has become an inevitable requirement for the development of high-speed spindles. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a high-speed spindle cage seal ring. The seal ring adopts the shape of a cage formed by the cross-connection of reverse 45° inclined angles in an inverted seven shape, and can form an air curtain during high-speed rotation to prevent external impurities from infiltrating into the spindle. The specially designed special-shaped curved surface has a certain flow guiding function.

[0005] To solve the above problems, the specific technical solution of the present invention is as follows: A high-speed spindle cage seal ring is composed of a rotary ring and a rotary body auger. The outer circumference of the rotary ring is a special-shaped curved surface with an inner end diameter larger than the outer end; the rotary body auger is composed of several inverted-seven-shaped auger wires. Every two auger wires form a group. The two auger wires in the same group are respectively inclined at 45° positive and negative with respect to the central axis, and each adjacent two groups of auger wires intersect at both end faces of the rotary ring; the overall outer circumference formed by several groups of auger wires is in the shape of a slope with a higher inner end face and a lower outer end face.

[0006] The central axis of the auger wire consists of a vertical line, a transition arc, an inclined line, and a tail arc. The vertical line is perpendicular to the central axis of the rotary ring and is close to the large-diameter end face of the rotary ring; the inclined line forms an angle α with the vertical line, and the angle α is 60° - 85°, and is inclined towards the small-diameter end face of the rotary ring. The inner ends of the vertical line and the inclined line are connected by a transition arc, and the outer end of the inclined line is connected to the small-diameter end face of the rotary ring close to the rotary ring through a tail arc; the auger wire is rotated with the central axis as the center and a radius of 1 - 3 mm.

[0007] The special-shaped curved surface on the outer circumference of the rotary ring consists of a high-slope curved surface, a concave curved surface, and a low-slope curved surface. The end face of the high-slope curved surface is the large-diameter end of the rotary ring, and the upper surface of the high-slope curved surface is connected to the vertical line of the axis of the stranded wire. The low-slope curved surface is the small-diameter end of the rotary ring, and the upper surface of the low-slope curved surface is connected to the arc at the end of the axis of the stranded wire. The concave curved surface is located between the high-slope curved surface and the low-slope curved surface and has an arc transition.

[0008] The rotary ring and the rotary body auger are of an integral structure and are fabricated by 3D printing with a high-temperature and high-density resin material.

[0009] During the rotation of the rotary ring, the high-speed spindle auger seal ring forms a forward suction force, which is introduced into the auger through the special-shaped curved surface. During high-speed rotation, the air flow passes through the gaps of the auger, forming an air curtain between the outer cover of the spindle and the rotary body auger to prevent external impurities from infiltrating into the spindle. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 Fig. is a perspective view of the high-speed spindle auger seal ring.

[0011] Figure 2 Fig. is a partial cross-sectional view of the high-speed spindle auger seal ring.

[0012] Figure 3 Fig. is Figure 2 a partially enlarged view of

[0013] Figure 4 Fig. is a schematic diagram of the external shape structure of the rotary ring and the rotary body auger.

[0014] Figure 5 Fig. is a curve diagram of the auger.

[0015] Figure 6 Fig. is an application state diagram of the high-speed spindle auger seal ring. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] As Figures 1 to 3 shown, a high-speed spindle auger seal ring is composed of a rotary ring 1 and a rotary body auger 7. The outer circumference of the rotary ring 1 is a special-shaped curved surface with an inner end diameter larger than the outer end. The rotary body auger 7 is composed of several inverted-seven-shaped stranded wires 71. Every two stranded wires 71 form a group. The two stranded wires 71 in the same group are respectively inclined at 45° to the positive and negative directions of the axis. Every two adjacent groups of stranded wires 71 intersect at the two end faces of the rotary ring 1. The overall outer circumference formed by several groups of stranded wires 71 is in the shape of a slope with a high inner end face and a low outer end face. The rotary ring 1 and the rotary body auger 7 are of an integral structure and are fabricated by 3D printing.

[0017] As Figure 5As shown, the central axis of the wire winding 71 consists of a vertical line 11, a transition arc 12, an inclined line 13, and a tail-end arc 14. The vertical line 11 is perpendicular to the central axis of the rotary ring 1 and is close to the large-diameter end face of the rotary ring 1. The inclined line 13 forms an α angle of 60° to 85° with the vertical line 11 and inclines towards the small-diameter end face of the rotary ring 1. The inner ends of the vertical line 11 and the inclined line 13 are connected by the transition arc 12, and the outer end of the inclined line 13 is connected to the small-diameter end face of the rotary ring 1 close to it through the tail-end arc 14. The wire winding 71 is formed by rotating around the central axis with a radius of 1 - 3 mm.

[0018] As Figure 4 As shown, the special-shaped curved surface on the outer circumference of the rotary ring 1 is composed of a high-slope curved surface 21, a concave curved surface 22, and a low-slope curved surface 23. Among them, the end face of the high-slope curved surface 21 is the large-diameter end of the rotary ring 1, and the upper surface of the high-slope curved surface 21 is connected to the vertical line 11 of the central axis of the wire winding 71; the low-slope curved surface 23 is the small-diameter end of the rotary ring 1, and the upper surface of the low-slope curved surface 23 is connected to the tail-end arc 14 of the central axis of the wire winding 71; the concave curved surface 22 is located between the high-slope curved surface 21 and the low-slope curved surface 23 and has an arc transition.

[0019] As Figure 6 As shown, the high-speed spindle cage seal ring is embedded in the spindle outer cover, forming a forward suction force during the rotation of the rotary ring, introducing it into the rotary body auger 7 through the special-shaped curved surface of the rotary ring 1. During high-speed rotation, the air flow passes outwards through the gaps between the wire windings 71, forming an air curtain between the spindle outer cover and the rotary body auger 7 to prevent external impurities from infiltrating into the spindle. The locally entered water vapor can flow out through the spindle drain hole. The high-speed spindle cage seal ring of the present application enables the spindle to have an airtight function regardless of forward or reverse rotation without the need for a gas source, has a good spindle protection effect, and prolongs the service life of the spindle.

Claims

1. A high-speed spindle cage seal ring, characterized in that: It is composed of a rotating ring (1) and a rotating screw (7). The outer circumference of the rotating ring (1) is a special-shaped curved surface with the inner end diameter larger than the outer end. The rotating screw (7) is composed of several inverted-seven-shaped wire strands (71). Every two wire strands (71) form a group. The two wire strands (71) in the same group are respectively inclined at 45° positive and negative to the central axis. Every two adjacent groups of wire strands (71) intersect at the two end faces of the rotating ring (1). The overall outer circumference formed by several groups of wire strands (71) is in the shape of a slope with a higher inner end face and a lower outer end face. The central axis of the wire strand (71) consists of a vertical line (11), a transition arc (12), an inclined line (13), and a tail-end arc (14). The vertical line (11) is perpendicular to the central axis of the rotating ring (1) and is close to the large-diameter end face of the rotating ring (1). The inclined line (13) forms an angle α with the vertical line (11), and the angle α is 60° - 85°, and it is inclined towards the small-diameter end face of the rotating ring (1). The inner ends of the vertical line (11) and the inclined line (13) are connected by a transition arc (12). The outer end of the inclined line (13) is connected to the small-diameter end face of the rotating ring (1) through a tail-end arc (14). The wire strand (71) is rotated with the central axis as the center and a radius of 1 - 3 mm. The special-shaped curved surface of the outer circumference of the rotating ring (1) is composed of a high-slope curved surface (21), a concave curved surface (22), and a low-slope curved surface (23). The end face of the high-slope curved surface (21) is the large-diameter end of the rotating ring (1), and the upper surface of the high-slope curved surface (21) is connected to the vertical line (11) of the central axis of the wire strand (71). The low-slope curved surface (23) is the small-diameter end of the rotating ring (1), and the upper surface of the low-slope curved surface (23) is connected to the tail-end arc (14) of the central axis of the wire strand (71). The concave curved surface (22) is located between the high-slope curved surface (21) and the low-slope curved surface (23) and has an arc transition.

2. The high-speed spindle cage seal ring according to claim 1, characterized in that: The rotating ring (1) and the rotating screw (7) are of an integral structure and are made by 3D printing with a high-temperature and high-density resin material.

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