A horizontal machining center spindle seal magnetic fluid seal combined seal device

Abstract

The present application relates to horizontal machining center spindle sealing technical field, especially to a kind of horizontal machining center spindle sealing magnetic fluid sealing combined sealing device.The circumferential of high-speed electric spindle is provided with labyrinth seal ring and labyrinth bushing, sealing seat is arranged between labyrinth seal ring and labyrinth bushing, high-performance annular permanent magnet is arranged in sealing seat, left pole shoe and right pole shoe are respectively arranged in the two sides of high-performance annular permanent magnet, baffle sleeve is arranged in the side of right pole shoe close to labyrinth bushing, axial positioning assembly is arranged between baffle sleeve and labyrinth bushing, outer cover is detachably connected in the side of sealing seat close to labyrinth bushing, outer cover is detachably connected with labyrinth bushing.The present application improves the performance of magnetic fluid for horizontal machining center spindle sealing, and prolongs service life, under the action of O-shaped sealing ring, cutting fluid and microparticle can also be prevented from invading, effectively solve the problem of machining center spindle sealing not tight, with high reliability and good stability.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of horizontal machining center spindle sealing, in particular to a magnetic fluid sealing combined sealing device for horizontal machining center spindle sealing. BACKGROUND

[0002] Most of the horizontal machining center spindle sealing adopts labyrinth sealing or air sealing structure. When the spindle rotates at a high speed, external cutting fluid and cutting particles are easy to enter the sealing cavity, causing the high-speed rotating bearing to be damaged and corroded, seriously affecting the stable operation and service life of the bearing, and even seriously affecting the machining precision of the horizontal machining center, which brings certain hidden dangers to the high-speed stable operation of the horizontal machining center. The air sealing structure needs a complex auxiliary system, which is high in cost and inevitably increases the occupied space of the sealing device. Therefore, a sealing device for horizontal machining center spindle sealing is needed to solve the problem of loose sealing of horizontal machining center spindle. SUMMARY

[0003] The purpose of the present application is to provide a magnetic fluid sealing combined sealing device for horizontal machining center spindle sealing to solve the problems existing in the prior art.

[0004] To achieve the above purpose, the present application provides the following scheme: a magnetic fluid sealing combined sealing device for horizontal machining center spindle sealing, comprising a high-speed electric spindle installed in a horizontal machining center, a labyrinth sealing ring and a labyrinth shaft sleeve are sleeved on the circumference of the high-speed electric spindle, a sealing seat is arranged between the labyrinth sealing ring and the labyrinth shaft sleeve, a high-performance annular permanent magnet is arranged in the sealing seat, left and right pole shoes are arranged on the two sides of the high-performance annular permanent magnet, a retaining sleeve is arranged on the side of the right pole shoe close to the labyrinth shaft sleeve, an axial positioning assembly is arranged between the retaining sleeve and the labyrinth shaft sleeve, an outer cover is detachably connected to the side of the sealing seat close to the labyrinth shaft sleeve, and the outer cover is detachably connected with the labyrinth shaft sleeve; the positioning assembly comprises a tetrafluoro ring, the tetrafluoro ring is detachably connected with the labyrinth shaft sleeve, a semicircular groove is formed in one end of the tetrafluoro ring away from the labyrinth shaft sleeve, a rubber ring is installed in the semicircular groove, and the rubber ring abuts against the retaining sleeve.

[0005] Preferably, a sealing ring is arranged between the high-speed electric spindle and the labyrinth shaft sleeve, and the high-speed electric spindle is connected with the labyrinth shaft sleeve through an inner hexagonal concave end set screw.

[0006] Preferably, the left and right pole shoes are provided with pole teeth on the side close to the labyrinth shaft sleeve, and the gap between the pole teeth and the labyrinth shaft sleeve is filled with magnetic fluid.

[0007] Preferably, the gap between the pole tooth and the labyrinth bushing is 0.1mm-0.3mm.

[0008] Preferably, the left pole shoe and the right pole shoe are provided with O-shaped sealing rings at the end away from the labyrinth bushing, and the right pole shoe is provided with a sealing ring between the labyrinth bushing and the sealing seat.

[0009] Preferably, the labyrinth sealing ring is in abutment with the shaft shoulder of the high-speed motorized spindle.

[0010] Preferably, the sealing seat is provided with an internal hexagonal cylindrical head screw, and the internal hexagonal cylindrical head screw is detachably connected with the horizontal machining center.

[0011] Preferably, the sealing seat is provided with a leakage passage on the side close to the labyrinth sealing ring, the leakage passage is perpendicular to the shaft center of the high-speed motorized spindle, and the sealing seat is made of non-magnetic material.

[0012] The present application discloses the following technical effects:

[0013] The magnetic fluid is injected into the gap between the pole tooth and the labyrinth bushing, the magnetic circuit is formed by the labyrinth bushing, the pole shoe and the high-performance annular permanent magnet, under the action of the magnetic field in the gap, the magnetic fluid is highly concentrated and forms a liquid sealing ring along the gap between the pole tooth and the labyrinth bushing, when the magnetic fluid is affected by the pressure difference, the magnetic fluid slightly moves in the non-uniform magnetic field, generates a magnetic force to resist the pressure difference, so as to reach a new balance, and then the gap between the annular magnetic pole and the magnetic conductor shaft is sealed, the baffle is installed at the right end of the right pole shoe, the lubricating grease is filled at the axial positioning assembly, and the existence of the baffle effectively improves the problem of sealing failure caused by the relative speed difference and the interface instability of the liquid medium (which are not soluble), improves the performance of the magnetic fluid for the horizontal machining center spindle seal, significantly prolongs the service life, and further prevents the invasion of cutting fluid and particles under the action of the O-shaped sealing ring, effectively solves the problem of poor sealing of the machining center spindle, has high reliability and good stability. BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments. Obviously, the drawings in the following description only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0015] Figure 1 The structure of the present application is shown in the figure;

[0016] Figure 2 The present application Figure 1Amplification structure schematic diagram of middle A;

[0017] Figure 3 For the present application Figure 1 Amplification structure schematic diagram of middle B;

[0018] Wherein, 1, high-speed electric spindle; 2, labyrinth seal ring; 3, sealing seat; 4, inner hexagonal cylindrical head screw; 5, outer cover; 6, baffle sleeve; 7, labyrinth shaft sleeve; 8, inner hexagonal concave end set screw; 9, sealing ring; 10, leakage passage; 11, left pole shoe; 12, high-performance annular permanent magnet; 13, O-shaped sealing ring; 14, right pole shoe; 15, magnetic fluid; 16, pole tooth; 21, rubber ring; 22, tetrafluoro ring. DETAILED DESCRIPTION

[0019] 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 part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0020] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0021] Reference Figures 1-3 The present application provides a magnetic fluid sealing combined sealing device for sealing the main shaft of a horizontal machining center, which comprises a high-speed electric spindle 1 installed in a horizontal machining center, a labyrinth seal ring 2 and a labyrinth shaft sleeve 7 are sleeved on the circumference of the high-speed electric spindle 1, a sealing seat 3 is arranged between the labyrinth seal ring 2 and the labyrinth shaft sleeve 7, a high-performance annular permanent magnet 12 is arranged in the sealing seat 3, a left pole shoe 11 and a right pole shoe 14 are arranged on both sides of the high-performance annular permanent magnet 12, a baffle sleeve 6 is arranged on the side of the right pole shoe 14 close to the labyrinth shaft sleeve 7, an axial positioning assembly is arranged between the baffle sleeve 6 and the labyrinth shaft sleeve 7, an outer cover 5 is detachably connected to the side of the sealing seat 3 close to the labyrinth shaft sleeve 7, and the outer cover 5 is detachably connected with the labyrinth shaft sleeve 7; the positioning assembly comprises a tetrafluoro ring 22, the tetrafluoro ring 22 is detachably connected with the labyrinth shaft sleeve 7, a semicircular groove is formed at one end of the tetrafluoro ring 22 away from the labyrinth shaft sleeve 7, a rubber ring 21 is installed in the semicircular groove, and the rubber ring 21 abuts against the baffle sleeve 6.

[0022] The high-performance annular permanent magnet 12 serves as a magnetic source to provide magnetic force for the left pole shoe 11 and the right pole shoe 14, and the rubber ring 21 installed in the semicircular groove plays the role of axial positioning of the left pole shoe 11, the high-performance annular permanent magnet 12 and the right pole shoe 14.

[0023] The four fluorine ring 22 has the characteristics of high temperature resistance, strong flexibility, long service life, and good sealing performance. The lubricating grease filled at the rubber ring 21 and the four fluorine ring 22 enhances the lubricity.

[0024] Further optimization scheme, the high-speed motorized spindle 1 is provided with a sealing ring 9 between the labyrinth shaft sleeve 7, and the high-speed motorized spindle 1 is connected with the labyrinth shaft sleeve 7 through the hexagonal concave end set screw 8. Through the blocking sleeve 6 and the labyrinth shaft sleeve 7, the sealing effect is enhanced, and the possibility of invasion of cutting fluid and cutting particles is effectively reduced.

[0025] Further optimization scheme, in order to improve the sealing performance, the left pole shoe 11 and the right pole shoe 14 are provided with pole teeth 16 on the side close to the labyrinth shaft sleeve 7, and the gap between the pole teeth 16 and the labyrinth shaft sleeve 7 is filled with magnetic fluid 15.

[0026] Further optimization scheme, the gap between the pole teeth 16 and the labyrinth shaft sleeve 7 is 0.1mm-0.3mm. The magnetic fluid 15 with low evaporation rate and not soluble with cutting fluid is selected, and the concentration of magnetic particles in the magnetic fluid 15 is increased, the viscosity of the magnetic fluid 15 is increased, the sealing performance is improved, and the service life is prolonged.

[0027] Further optimization scheme, the left pole shoe 11 and the right pole shoe 14 are provided with O-shaped sealing rings 13 on the end away from the labyrinth shaft sleeve 7, and the right pole shoe 14 is provided with a sealing ring 9 between the blocking sleeve 6 and the sealing seat 3. The air tightness of the left pole shoe 11 and the right pole shoe 14 and the sealing seat 3 is increased through the O-shaped sealing ring 13, and the air tightness between the right pole shoe 14 and the blocking sleeve 6 and the sealing seat 3 is increased through the sealing ring 9; the blocking sleeve 6 is installed on one side of the right pole shoe 14, which can reduce the relative velocity difference of the sealed liquid cutting fluid and the magnetic fluid interface, and reduce the instability of the interface.

[0028] Further optimization scheme, the labyrinth sealing ring 2 abuts against the shaft shoulder of the high-speed motorized spindle 1. The labyrinth sealing ring 2 performs primary sealing.

[0029] Further optimization scheme, the sealing seat 3 is provided with an internal hexagonal cylindrical head screw 4, and the internal hexagonal cylindrical head screw 4 is detachably connected with the horizontal machining center.

[0030] Further optimization scheme, the sealing seat 3 is provided with a leakage channel 10 on the side close to the labyrinth sealing ring 2, the leakage channel 10 is perpendicular to the axis of the high-speed motorized spindle 1, and the sealing seat 3 is made of non-magnetic material.

[0031] Working process: the magnetic fluid 15 is injected into the gap between the pole tooth 16 and the labyrinth shaft sleeve 7, the labyrinth shaft sleeve 7 has high magnetic conductivity, the magnetic circuit is formed through the labyrinth shaft sleeve 7, the left pole shoe 11, the right pole shoe 14 and the high-performance ring-shaped permanent magnet 12, under the action of the magnetic field generated in the gap, the magnetic fluid 15 is highly concentrated and forms a liquid sealing ring along the gap between the pole tooth 16 and the labyrinth shaft sleeve 7, when the magnetic fluid 15 is affected by the pressure difference, the magnetic fluid 15 slightly moves in the non-uniform magnetic field, generates the magnetic force resisting the pressure difference, so as to achieve the new balance, and then the gap between the pole tooth 16 and the labyrinth shaft sleeve 7 is sealed.

[0032] In the description of the present application, it should be understood that the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0033] The above-described embodiments are only used to describe the preferred modes of the present application, and do not limit the scope of the present application, and various modifications and improvements to the technical solutions of the present application made by those skilled in the art without departing from the design spirit of the present application shall fall within the protection scope of the present application.

Claims

1. A magnetic fluid seal combined sealing device for horizontal machining center spindle seal, characterized in that: The application relates to a high-speed electric spindle (1) installed in a horizontal machining center, wherein a labyrinth seal ring (2) and a labyrinth sleeve (7) are arranged in the circumferential direction of the high-speed electric spindle (1), a sealing seat (3) is arranged between the labyrinth seal ring (2) and the labyrinth sleeve (7), a high-performance annular permanent magnet (12) is arranged in the sealing seat (3), left and right pole shoes (11) and (14) are arranged on the two sides of the high-performance annular permanent magnet (12), a blocking sleeve (6) is arranged on the side of the right pole shoe (14) close to the labyrinth sleeve (7), an axial positioning assembly is arranged between the blocking sleeve (6) and the labyrinth sleeve (7), and an outer cover (5) is detachably connected to the side of the sealing seat (3) close to the labyrinth sleeve (7). The positioning assembly comprises a tetrafluoro ring (22) which is detachably connected to the labyrinth sleeve (7), a semicircular groove is formed in the end of the tetrafluoro ring (22) away from the labyrinth sleeve (7), and a rubber ring (21) is arranged in the semicircular groove and abuts against the blocking sleeve (6).

2. The magnetic fluid seal combined sealing device for the spindle seal of the horizontal machining center according to claim 1, characterized in that: A sealing ring (9) is arranged between the high-speed electric spindle (1) and the labyrinth sleeve (7), and the high-speed electric spindle (1) is connected to the labyrinth sleeve (7) through an inner hexagonal recess end set screw (8).

3. The MHD sealing combined sealing device for horizontal machining center spindle sealing according to claim 1, characterized in that: The left and right pole shoes (11) and (14) are provided with pole teeth (16) on the sides close to the labyrinth sleeve (7), and the gap between the pole teeth (16) and the labyrinth sleeve (7) is filled with a magnetic fluid (15).

4. The magnetic fluid seal combined sealing device for the spindle seal of the horizontal machining center according to claim 3, characterized in that: The gap between the pole teeth (16) and the labyrinth sleeve (7) is 0.1mm-0.3mm.

5. The MHD sealing assembly for sealing the spindle of a horizontal machining center according to claim 1, characterized in that: The left and right pole shoes (11) and (14) are provided with O-shaped sealing rings (13) on the ends away from the labyrinth sleeve (7), and the right pole shoe (14) is provided with a sealing ring (9) between the blocking sleeve (6) and the sealing seat (3).

6. The MHD sealing assembly for sealing the spindle of a horizontal machining center according to claim 1, characterized in that: The labyrinth seal ring (2) abuts against the shaft shoulder of the high-speed electric spindle (1).

7. The MHD sealing assembly for sealing the spindle of a horizontal machining center according to claim 1, characterized in that: An inner hexagonal cylindrical head screw (4) is arranged on the sealing seat (3) and detachably connected to the horizontal machining center.

8. The MHD sealing assembly for sealing the spindle of a horizontal machining center according to claim 1, characterized in that: A leakage channel (10) is formed in the side of the sealing seat (3) close to the labyrinth seal ring (2), the leakage channel (10) is perpendicular to the shaft center of the high-speed electric spindle (1), and the sealing seat (3) is made of a non-magnetic material.

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