Combined magnetic air bearing main shaft

Abstract

The utility model discloses a combined type magnetic air bearing main shaft, which relates to the technical field of mechanical equipment main shafts, and comprises an air bearing and an axial magnetic bearing, the air bearing comprises a rotating shaft core and a suspension shaft sleeve, and an air inlet hole is arranged along the radial direction of the suspension shaft sleeve in a penetrating manner; the axial magnetic bearing comprises a chuck, a front gap adjusting device, a rear gap adjusting device, a front magnetic ring set and a rear magnetic ring set, each of the front magnetic ring set and the rear magnetic ring set comprises two magnetic rings, and the two magnetic rings in the front magnetic ring set and the two magnetic rings in the rear magnetic ring set are arranged in a same-pole opposite mode. The front gap adjusting device is used for adjusting gaps between the front magnetic ring sets, and the rear gap adjusting device is used for adjusting gaps between the rear magnetic ring sets. The gap between the front magnetic ring sets is adjusted through the front gap adjusting device, and the gap between the rear magnetic ring sets is adjusted through the rear gap adjusting device, so that the purpose of controlling the axial pressure is achieved, and the device is more suitable for the working condition needing mirror surface machining.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of mechanical equipment main shaft, specifically relates to a combined magnetic air bearing main shaft. BACKGROUND

[0002] Mechanical equipment main shaft is the important part for providing limit and constraint for rotating shaft, and has wide application in the field of mechanical processing device, however, the bearing structure of the processing main shaft and tool main shaft of the general equipment is divided into two categories, one kind is contact type ball bearing or roller bearing, and the structure thereof is that the axial and radial directions are supported by ball or roller, and the contact type rotation of shaft and bearing is realized, and the other kind is non-contact type air bearing, and the air bearing is used in the axial and radial directions, that is, the rotation of shaft is supported by high pressure air, and the non-contact type rotation of shaft and bearing is realized, no matter contact bearing or non-contact type air bearing, the axial soft buffering rotation of shaft cannot be realized, that is, the axial gap of shaft is adjusted according to the requirement of processing to realize the control of axial pressure of shaft. SUMMARY

[0003] The utility model discloses a combined magnetic air bearing main shaft, which solves the problem that the axial gap of shaft cannot be adjusted to control the pressure of shaft in the prior art.

[0004] In order to realize the above-mentioned purpose, the utility model adopts the following technical scheme:

[0005] A combined magnetic air bearing main shaft, comprising an air bearing and an axial magnetic bearing, the air bearing comprising a rotating shaft core and a suspension shaft sleeve, the suspension shaft sleeve being arranged on the side of the rotating shaft core, the suspension shaft sleeve being recessed at both ends to form grooves, and an air inlet hole being arranged through the suspension shaft sleeve in the radial direction; the axial magnetic bearing comprising a chuck, a front gap adjusting device, a rear gap adjusting device, a front magnetic ring group and a rear magnetic ring group, the chuck being connected to the end of the rotating shaft core, the front magnetic ring group and the rear magnetic ring group each comprising two magnetic rings, the two magnetic rings in the front magnetic ring group and the two magnetic rings in the rear magnetic ring group being arranged oppositely at the same level; the front magnetic ring group being located between the chuck and the suspension shaft sleeve, the front gap adjusting device being used to adjust the gap between the front magnetic ring group, the rear magnetic ring group being located between the suspension shaft sleeve and the rear gap adjusting device, and the rear gap adjusting device being used to adjust the gap between the rear magnetic ring group.

[0006] Optionally, a threaded hole one is arranged at one end of the rotary shaft core, and an external thread is arranged on the outer wall of the other end; the chuck is recessed towards the center at both ends to form a bolt slot and a clamping slot respectively, the pre-interference adjustment device is located in the bolt slot, the end of the rotary shaft core provided with the threaded hole one is located in the clamping slot, a threaded hole two is arranged at the center position of the chuck, the rotary shaft core, the chuck, the pre-interference adjustment device, the threaded hole one and the threaded hole two are located on the same axial line, and the pre-interference adjustment device is threadedly connected with the rotary shaft core through the threaded hole one and the threaded hole two; the post-interference adjustment device is threadedly connected with the rotary shaft core through the external thread.

[0007] Optionally, the adjustment gap between the pre-magnetic ring group and the post-magnetic ring group is 0.1mm to 10mm.

[0008] Optionally, the threaded hole two communicates the bolt slot and the clamping slot.

[0009] Optionally, a constraint part is arranged on the post-interference adjustment device, and the constraint part is used for fixing the post-magnetic ring group.

[0010] Optionally, one magnetic ring in the pre-magnetic ring group is located in the clamping slot, and the other magnetic ring is located in the groove; one magnetic ring in the post-magnetic ring group is located on the post-interference adjustment device, and the other magnetic ring is located in the groove.

[0011] Beneficial effects: the combined magnetic air bearing spindle of the utility model contains air bearing and axial magnetic bearing, air bearing includes rotary shaft core and suspension shaft sleeve, air bearing friction resistance is lower, so that the combined magnetic air bearing spindle of the utility model has lower temperature rise when running at high speed, and is suitable for high-speed running machine; axial magnetic bearing includes chuck, pre-interference adjustment device, post-interference adjustment device, pre-magnetic ring group and post-magnetic ring group, pre-magnetic ring group is fixed on chuck and suspension shaft sleeve respectively, the gap between pre-magnetic ring group is adjusted through pre-interference adjustment device, post-magnetic ring group is fixed on post-interference adjustment device and suspension shaft sleeve respectively, the gap between post-magnetic ring group is adjusted through post-interference adjustment device, so that the combined magnetic air bearing spindle can adjust axial gap by adjusting the gap of pre-magnetic ring group and post-magnetic ring group, thereby achieving the purpose of controlling axial pressure, and being more suitable for working conditions requiring mirror surface processing. BRIEF DESCRIPTION OF DRAWINGS

[0012] Fig. 1 It is a sectional view of the combined magnetic air bearing spindle in the embodiment.

[0013] Fig. 2 It is a connection schematic view of the combined magnetic air bearing spindle and motor rotor in the embodiment.

[0014] In the figure: 1, air bearing; 101, rotation axis core; 102, suspension shaft sleeve; 2, axial magnetic bearing; 201, chuck; 202, front gap adjusting device; 203, rear gap adjusting device; 204, front magnetic ring group; 205, rear magnetic ring group; 3, recess; 4, air inlet hole; 5, bolt groove; 6, clamping groove; 7, constraint part. DETAILED DESCRIPTION

[0015] EMBODIMENT

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the present application will be briefly introduced below in combination with the drawings and the description of the embodiments or the prior art. Obviously, the following description of the drawings structure is only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor. It should be noted that the description of these embodiments is used to help understand the present application, but does not constitute a limitation on the present application.

[0017] In the description of the present application, it should be understood that the orientation words such as "front, rear, upper, lower, left, right", "transverse, vertical, perpendicular, horizontal" and "top, bottom" and the like indicate the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Without making the opposite statement, these orientation words do not indicate and imply that the indicated device or element must have a specific orientation or be constructed and operated in a specific orientation, so it cannot be understood as a limitation on the protection scope of the present application; the orientation words "inner, outer" refer to the inner and outer of the contour of each component.

[0018] In the description of the present application, it should be understood that the use of "first", "second" and the like to limit parts is only for the convenience of distinguishing the corresponding parts, and if there is no further declaration, the above words have no special meaning, so it cannot be understood as a limitation on the protection scope of the present application.

[0019] As Figs. 1-2As shown, the embodiment provides a combined magnetic air bearing spindle, comprising an air bearing 1 and an axial magnetic bearing 2, the air bearing 1 comprises a rotating shaft core 101 and a suspension shaft sleeve 102, the suspension shaft sleeve 102 is arranged on the side of the rotating shaft core 101, the suspension shaft sleeve 102 is in a cylindrical shape, the suspension shaft sleeve 102 is recessed to form a groove 3 at both ends, and an air inlet hole 4 is arranged through the radial direction of the suspension shaft sleeve 102; the axial magnetic bearing 2 comprises a chuck 201, a front gap adjusting device 202, a rear gap adjusting device 203, a front magnetic ring group 204 and a rear magnetic ring group 205, the chuck 201 is connected to the end of the rotating shaft core 101, the front magnetic ring group 204 and the rear magnetic ring group 205 each contain two magnetic rings, the two magnetic rings in the front magnetic ring group 204 and the two magnetic rings in the rear magnetic ring group 205 are arranged in the same level; the front magnetic ring group 204 is located between the chuck 201 and the suspension shaft sleeve 102, the front gap adjusting device 202 is used for adjusting the gap between the front magnetic ring group 204, the rear magnetic ring group 205 is located between the suspension shaft sleeve 102 and the rear gap adjusting device 203, and the rear gap adjusting device 203 is used for adjusting the gap between the rear magnetic ring group 205.

[0020] The combined magnetic air bearing spindle of the utility model, contain air bearing 1 and axial magnetic bearing 2, air bearing 1 includes rotating shaft core 101 and suspension shaft sleeve 102, and air bearing 1 lower friction resistance makes this combined magnetic air bearing spindle lower temperature rise when high speed operation, be applicable to the machine of high speed operation, axial magnetic bearing 2 includes chuck 201, front gap adjusting device 202, rear gap adjusting device 203, front magnetic ring group 204 and rear magnetic ring group 205, and front magnetic ring group 204 is fixed on chuck 201 and suspension shaft sleeve 102 respectively, and the gap between front magnetic ring group 204 is adjusted by front gap adjusting device 202, and rear magnetic ring group 205 is fixed on rear gap adjusting device 203 and suspension shaft sleeve 102 respectively, and the gap between rear magnetic ring group 205 is adjusted by rear gap adjusting device 203, so that the combined magnetic air bearing spindle can adjust the axial gap by adjusting the gap of front magnetic ring group 204 and rear magnetic ring group 205, thereby reach the purpose of controlling axial pressure, and be more applicable to the working condition needing mirror surface processing.

[0021] Specifically, in the embodiment, the front gap adjusting device 202 is a bolt, the rear gap adjusting device 203 is a nut, one end of the rotary shaft core 101 is provided with a threaded hole one, and the outer wall of the other end is provided with an external thread; the chuck 201 is recessed towards the center at both ends to form a bolt slot 5 and a clamping slot 6, respectively, the front gap adjusting device 202 is located in the bolt slot 5, the end of the rotary shaft core 101 provided with the threaded hole one is located in the clamping slot 6, the chuck 201 is provided with a threaded hole two at the center position, the rotary shaft core 101, the chuck 201, the front gap adjusting device 202, the threaded hole one and the threaded hole two are located on the same axis line, and the front gap adjusting device 202 is threadedly connected with the rotary shaft core 101 through the threaded hole one and the threaded hole two; the rear gap adjusting device 203 is threadedly connected with the rotary shaft core 101 through the external thread.

[0022] The gap between the front magnetic ring group 204 and the rear magnetic ring group 205 is adjusted by a bolt and a nut, respectively, which is simple to operate; the gap between the front magnetic ring group 204 can also be adjusted by a nut, and the gap between the rear magnetic ring group 205 can also be adjusted by a bolt, of course, the gap adjusting mode is not limited to adjustment by a bolt and a nut.

[0023] The adjusting gap between the front magnetic ring group 204 and the rear magnetic ring group 205 is 0.1mm to 10mm.

[0024] Through gap adjustment, non-contact axial flexible rotation is realized, the radial bearing gap is 0.005mm to 0.1mm, the radial gap and air pressure (generally >0.5MPa) can be set according to the rotation rigidity specification requirements, non-contact rotation is realized, and in the specific working process, an air dispersion layer (not shown in the figure) is further arranged between the rotary shaft core 101 and the suspension shaft sleeve 102, the air input by the air inlet hole 4 is uniformly distributed on the side of the rotary shaft core 101 through the air dispersion layer, so that the rotary shaft core 101 is away from the suspension shaft sleeve 102 to realize non-contact rotation.

[0025] The threaded hole two communicates the bolt slot 5 and the clamping slot 6.

[0026] The rear gap adjusting device 203 is provided with a constraint part 7, and the constraint part 7 is used for fixing the rear magnetic ring group 205.

[0027] One of the magnetic rings in the front magnetic ring group 204 is located in the clamping slot 6, and the other magnetic ring is located in the groove 3; one of the magnetic rings in the rear magnetic ring group 205 is located on the rear gap adjusting device 203, and the other magnetic ring is located in the groove 3.

[0028] Specifically, the groove 3 is in the shape of a convex, the groove 3 is arranged along the circumferential side of the suspension shaft sleeve 102, the groove 3 is divided into a first groove part and a second groove part, the clamping groove 6 is divided into a first clamping groove and a second clamping groove, the rotary shaft core 101 is located in the first clamping groove, one of the magnetic rings in the front magnetic ring group 204 is located in the second clamping groove, and the other magnetic ring is located in the first groove part, and the front magnetic ring group 204 is sleeved in the second clamping groove and the first groove part respectively through a tolerance fit; the front gap adjusting device 202 is threadedly connected with the rotary shaft core 101 through the threaded hole one and the threaded hole two, the gap in front of the front magnetic ring group 204 is adjusted by adjusting the front gap adjusting device 202, and the second groove part provides space for gap adjustment.

[0029] One of the magnetic rings in the rear magnetic ring group 205 is located in the first groove part, and the other magnetic ring is fixed on the rear gap adjusting device 203 through the constraint part 7, and the rear magnetic ring group 205 is sleeved in the first groove part and the constraint part 7 respectively through a tolerance fit; the rear gap adjusting device 203 is threadedly connected at the end of the rotary shaft core 101, and the gap between the rear magnetic ring group 205 is adjusted by rotating the rear gap adjusting device 203.

[0030] The combined magnetic air bearing spindle of the utility model is in work, referring to Fig. 2 , one end of the rotary shaft core 101 connected with the rear gap adjusting device 203 is connected with the motor rotor, and the outer end of the chuck 201 is connected with a machined workpiece or a machining tool, the gap in front of the front magnetic ring group 204 and the rear magnetic ring group 205 is adjusted respectively by pre-adjusting the front gap adjusting device 202 and the rear gap adjusting device 203 according to the requirement of machining conditions, so as to adapt to the requirement of corresponding working conditions, in the working process, the machining tool will cause impact on the surface of the workpiece due to the influence of the uneven surface of the machining tool or the machined workpiece, when the combined magnetic air bearing spindle of the utility model feels the impact, the gap between the front magnetic ring group 204 and the rear magnetic ring group 205 can be actively adjusted, the active adjustment gap is generally small due to the influence of the installation gap of each part of the bearing.

[0031] Finally, it should be noted that: the above only for the preferred embodiment of the utility model, and not for limiting the protection scope of the utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the utility model shall be included in the protection scope of the utility model.

Claims

1. A combined magnetic air bearing spindle, comprising an air bearing (1) and an axial magnetic bearing (2), characterized in that, The air bearing (1) includes a rotating shaft core (101) and a suspension bushing (102). The suspension bushing (102) is disposed around the rotating shaft core (101). The two ends of the suspension bushing (102) are recessed towards the center to form grooves (3). An air inlet hole (4) is provided through the suspension bushing (102) radially. The axial magnetic bearing (2) includes a chuck (201), a front clearance adjustment device (202), a rear clearance adjustment device (203), a front magnetic ring assembly (204), and a rear magnetic ring assembly (205). The chuck (201) is connected to the end of the rotating shaft core (101). The front magnetic ring... Both the front magnetic ring group (204) and the rear magnetic ring group (205) contain two magnetic rings. The two magnetic rings in the front magnetic ring group (204) and the two magnetic rings in the rear magnetic ring group (205) are arranged opposite each other at the same level. The front magnetic ring group (204) is located between the chuck (201) and the suspension bushing (102). The front gap adjustment device (202) is used to adjust the gap between the front magnetic ring groups (204). The rear magnetic ring group (205) is located between the suspension bushing (102) and the rear gap adjustment device (203). The rear gap adjustment device (203) is used to adjust the gap between the rear magnetic ring groups (205).

2. The combined magnetic air bearing spindle according to claim 1, characterized in that, The rotary shaft (101) has a threaded hole at one end and an external thread on the outer wall of the other end. Both ends of the chuck (201) are recessed towards the center to form a bolt groove (5) and a chuck groove (6), respectively. The front clearance adjustment device (202) is located in the bolt groove (5). The end of the rotary shaft (101) with the threaded hole is located in the chuck groove (6). The center of the chuck (201) has a threaded hole (2). The rotary shaft (101), chuck (201), and front clearance adjustment device (202) are located on the same axis. The front clearance adjustment device (202) passes through the threaded hole and the threaded hole and is threadedly connected to the rotary shaft (101). The rear clearance adjustment device (203) is threadedly connected to the rotary shaft (101) through an external thread.

3. The combined magnetic air bearing spindle according to claim 1, characterized in that, The adjustment gap between the front magnetic ring group (204) and the rear magnetic ring group (205) is 0.1 mm to 10 mm.

4. A combined magnetic air bearing spindle according to claim 2, characterized in that, The threaded hole connects the bolt groove (5) and the retaining groove (6).

5. A combined magnetic air bearing spindle according to claim 1, characterized in that, The rear gap adjustment device (203) is provided with a constraint component (7), which is used to fix the rear magnetic ring assembly (205).

6. A combined magnetic air bearing spindle according to claim 2, characterized in that, One magnetic ring in the front magnetic ring group (204) is located in the slot (6), and the other magnetic ring is located in the groove (3); one magnetic ring in the rear magnetic ring group (205) is located on the rear gap adjustment device (203), and the other magnetic ring is located in the groove (3).

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