JP2019007509A - Spindle device - Google Patents

Abstract

To provide a spindle device which can lock rotation of a spindle even in a spindle device where it is difficult to secure a space for installing a spindle lock device.SOLUTION: A spindle device 100 includes a rotary shaft 1 and a housing 2. One or more openings 1d are disposed on an outer peripheral surface of the rotary shaft 1. The housing 2 includes one or more lock parts 9. The one or more lock parts 9 have fixing members (9a), each of which may be disposed in one of the one or more openings 1d. The lock part 9 is provided so as to switch its state between a first state where the fixing member (9a) is disposed at the outside of each of the one or more openings 1d and a second state where the fixing member (9a) is disposed at the inside of each of the one or more openings 1d.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a spindle device.

  Conventionally, a lock device that locks the rotation shaft of a spindle is known. For example, in Japanese Patent Laid-Open No. 2013-052472 (Patent Document 1), a locking device body provided outside a spindle is engaged with or disengaged from a fixing surface or a fitting recess provided on the spindle side of a spindle housing or a motor. Thus, a spindle lock device that locks the spindle (rotating shaft) is disclosed.

JP2013-052472A

  However, the spindle lock device described in Patent Document 1 is disposed outside the spindle. For this reason, the application range of the spindle lock device is limited depending on whether or not an installation space for the spindle lock device can be secured outside the spindle. For example, in a spindle device installed in a limited space such as a spindle device for electrostatic coating, it is difficult to provide a space for installing the spindle lock device outside thereof.

  The present invention has been made in view of such problems of the prior art. A main object of the present invention is to provide a spindle device that can lock the rotation of a spindle (rotating shaft) even in a spindle device in which it is difficult to secure a space for installing the spindle lock device.

  A spindle device according to the present invention includes a housing, a first portion, a second portion, and a third portion located between the first portion and the second portion in the thrust direction. Including a rotation axis. One or more openings are disposed on the outer peripheral surface of the third portion of the rotating shaft. The one or more openings have a pair of inner walls facing each other in the rotation direction of the rotation shaft. The housing faces the first portion in the radial direction and faces the first journal bearing portion that pivotally supports the rotating shaft, and faces the second portion in the radial direction and pivotally supports the rotating shaft. A second journal bearing portion, and one or more lock portions disposed between the first journal bearing portion and the second journal bearing portion in the thrust direction. The one or more lock portions have a fixing member that can be disposed inside the one or more openings, and the fixing member is disposed outside the one or more openings, and the fixing member includes It is provided so as to be switchable between a second state disposed inside one or more openings.

  According to the above spindle device, the rotation of the spindle can be locked by one or more lock portions included in the housing. For this reason, the spindle device is suitable for a spindle device for electrostatic coating or the like in which it is difficult to secure a space necessary for installing the spindle lock device.

  Furthermore, according to the spindle device, since the fixing member can be disposed near the rotation shaft, the radial length of the fixing member can be shortened. The fixing member whose radial length is shortened has, for example, high strength against bending.

  In the spindle device according to one aspect of the present invention, the housing further includes a holding portion holding one or more lock portions.

  According to the spindle device of one aspect of the present invention, one or more lock portions can be easily replaced by replacing the holding portion. In particular, when the housing includes a plurality of lock portions, the plurality of lock portions can be exchanged together by exchanging the holding portion.

  In the spindle device according to one aspect of the present invention, the one or more lock portions are provided to be switchable from the first state to the second state when the fixing member receives gas pressure.

  The manufacturing cost of the spindle device according to one aspect of the present invention is lower than the manufacturing cost of the spindle device of the comparative example in which one or more lock portions are provided so as to be electromagnetically controllable. Furthermore, the spindle device of one embodiment of the present invention is more suitable for a spindle device for electrostatic coating than the spindle device of a comparative example in which one or more lock portions are provided so as to be electromagnetically controllable. This is because in an electrostatic coating spindle device, a high voltage of tens of thousands of volts is applied to the paint passing through the interior thereof, and the spindle device according to one aspect of the present invention is provided inside the electrostatic coating spindle device. This is because it is possible to prevent the discharge.

  In the spindle device according to an aspect of the present invention, the one or more lock portions further include an elastic member that applies an elastic force to the fixing member in the radial direction. The first state is held by the elastic member.

  In the spindle device according to one aspect of the present invention, the first state can be held only by the elastic force. Therefore, the spindle device of one embodiment of the present invention can hold the first state more stably than a spindle device in which the first state is held by gas pressure or electromagnetic force.

  In the spindle device according to one aspect of the present invention, a screw hole having a hole axis along the radial direction is provided at an outer peripheral end portion of the fixing member in the radial direction.

  In the spindle device according to one aspect of the present invention, for example, when the fixing member is deformed and cannot be removed from one or more openings of the rotating shaft, the bolt connected to the screw hole is pulled out to the outer peripheral side in the radial direction. Thus, the second state can be switched to the first state.

  In the spindle device according to one aspect of the present invention, the housing includes a plurality of lock portions. In the spindle device, even after the supply of the rotation driving gas to the rotating shaft is stopped, the rotating shaft can rotate by inertia. Further, even after the inertial rotation of the rotating shaft is settled, the rotating shaft may continue to rotate due to the action of gas supplied to the static pressure gas bearing or so-called shaving air. In these cases, since it is necessary to lock the rotating shaft while the rotating shaft continues to rotate, a load is applied to each lock portion. In the spindle device according to one aspect of the present invention, the load on each lock portion when changing from the first state to the second state can be reduced as compared with a spindle device including only one lock portion. As the number of lock portions increases, the load applied to one lock portion can be reduced.

  In the spindle device according to one aspect of the present invention, at least one of the material constituting the rotating shaft and the material constituting the fixing member includes hardened steel. In the spindle device of one embodiment of the present invention, at least one of the rotating shaft and the fixed member has high strength. Therefore, generation | occurrence | production and a deformation | transformation with respect to at least any one of a rotating shaft and a fixing member can be suppressed.

  According to the present invention, it is possible to provide a spindle device that can lock the rotation of the spindle even in a spindle device in which it is difficult to secure a space for installing the spindle lock device.

It is sectional drawing which shows the 1st state of the spindle apparatus which concerns on embodiment. It is a perspective view which shows the holding | maintenance part of the spindle apparatus which concerns on embodiment. It is a fragmentary sectional view which shows the 2nd state of the spindle apparatus which concerns on embodiment. It is sectional drawing which shows the spindle holder of the coating device which concerns on embodiment. It is sectional drawing which shows the spindle apparatus 100 with which the cup was attached in the coating device which concerns on embodiment. It is a fragmentary sectional view which shows the modification of the spindle apparatus which concerns on embodiment. It is a fragmentary sectional view which shows the other modification of the spindle apparatus which concerns on embodiment. It is a fragmentary sectional view which shows the other modification of the spindle apparatus which concerns on embodiment. It is a perspective view which shows the holding | maintenance part of the other modification of the spindle apparatus which concerns on embodiment.

  Embodiments will be described below with reference to the drawings. In the following drawings, the same or corresponding parts are denoted by the same reference numerals, and the description thereof will not be repeated.

<Configuration of spindle device>
The configuration of the spindle device 100 according to the embodiment will be described with reference to FIGS. 1 to 3. As shown in FIG. 1, the spindle device 100 includes a rotating shaft 1 (spindle) and a housing 2.

  The rotating shaft 1 includes a shaft portion and a thrust plate portion. Hereinafter, the extending direction of the shaft portion of the rotating shaft 1 and the central axis of the thrust plate portion is referred to as a thrust direction, and the radial direction of the rotating shaft 1 with respect to the central axis is referred to as a radial direction. The central axis of the shaft portion of the rotary shaft 1 is arranged coaxially with the central axis of the thrust plate portion. The rotating shaft 1 is supported by a housing 2 described later so as to be rotatable in a circumferential direction around the central axis.

  The shaft portion of the rotating shaft 1 has a first portion 1a, a second portion 1b, and a third portion 1c. The shaft portion of the rotating shaft 1 has a cylindrical shape. In the thrust direction, the first portion 1a is spaced from the second portion 1b. The 2nd part 1b is arrange | positioned near the edge part of the rotating shaft 1 to which the cup 40 (refer FIG. 5) is attached rather than the 1st part 1a. Hereinafter, one side of the thrust direction in which the cup is attached in the spindle device 100 is referred to as a front side, and the other side is referred to as a rear side.

  A third portion 1c is disposed between the first portion 1a and the second portion 1b. The length of the third portion 1c in the thrust direction is shorter than, for example, each length of the first portion 1a and the second portion 1b in the thrust direction.

  One or more openings 1d are provided on the outer peripheral surface of the third portion 1c of the rotating shaft 1. The one or more openings 1d may be a plurality of openings 1d. The plurality of openings 1d have an inner wall surface facing the rotation direction of the rotary shaft 1, that is, the circumferential direction. The plurality of openings 1d are arranged at intervals in the circumferential direction. In a cross section perpendicular to the thrust direction, an angle (center angle) formed by one end and the other end of the opening 1d in the circumferential direction with respect to the central axis of the rotating shaft 1 is less than 360 degrees, and preferably 90 degrees. It is less than 45 degrees, more preferably less than 45 degrees. The material which comprises the rotating shaft 1 contains iron (Fe), for example. Preferably, the material constituting the rotating shaft 1 is a relatively high strength material, such as martensitic stainless steel or carbon steel. The strength can be evaluated by, for example, bending strength or hardness. The material which comprises the part which the several opening part 1d faces in the rotating shaft 1 is hardening steel. In other words, at least a portion of the rotating shaft 1 facing the plurality of openings 1d is preferably quenched.

  In the rotating shaft 1, the thrust plate portion is disposed on the rear side of the shaft portion. The 1st part 1a is arrange | positioned near the thrust board part rather than the 2nd part 1b. The thrust plate portion protrudes in the radial direction from the shaft portion. The shaft portion and the thrust plate portion may be provided integrally or may be provided separately.

  The thrust plate portion is provided with a plurality of rotary blades 1e. The plurality of rotor blades 1e are provided, for example, on a surface located on the shaft portion side in the thrust plate portion. Each of the plurality of rotor blades 1e is disposed at a distance from each other in the circumferential direction.

  The rotating shaft 1 is provided with a through hole 1f. The through hole 1f penetrates the rotary shaft 1 in the thrust direction. The hole axis of the through hole 1f extends along the thrust direction.

  The housing 2 includes a first bearing sleeve 3 and a second bearing sleeve 4, a first housing assembly 5 and a second housing assembly 6, a first cover 7 and a second cover 8, a lock portion 9, and a holding portion 10. The third bearing sleeve 11 and the nozzle plate 12 are included. Inside the housing 2, there is provided a gas flow passage 13 for driving the rotary shaft 1, and a bearing gas pressurized to form a hydrostatic gas bearing that rotatably supports the rotary shaft 1. The flow passages 14 and 15, and the lock portion drive gas flow passage 16 for driving the lock portion 9 are provided.

  The first bearing sleeve 3 is provided with a through hole 3a. The through hole 3a passes through the first bearing sleeve 3 in the thrust direction. The hole axis of the through hole 3a extends along the thrust direction. The hole axis of the through hole 3 a is arranged coaxially with the central axis of the rotating shaft 1. In the cross section perpendicular to the thrust direction, the shape of the through hole 3a is circular. The 1st part 1a of the rotating shaft 1 is arrange | positioned inside the through-hole 3a. A first bearing gap is provided between the inner peripheral surface of the through hole 3 a and the outer peripheral surface of the first portion 1 a of the rotating shaft 1. Further, a third bearing gap is provided between the surface facing the rear side of the first bearing sleeve 3 and the surface facing the front side of the thrust plate portion of the rotating shaft 1.

  The first bearing sleeve 3 is provided with a part of the flow passage 14 connected to the first bearing gap and the third bearing gap. One end of the portion located in the first bearing sleeve 3 in the flow passage 14 is arranged so as to continue to the first bearing gap or the third bearing gap, and the other end is the outer peripheral surface of the first bearing sleeve 3 in the radial direction. Is arranged.

  The second bearing sleeve 4 is spaced from the first bearing sleeve 3 in the thrust direction. The second bearing sleeve 4 is provided with a through hole 4a. The through hole 4a passes through the second bearing sleeve 4 in the thrust direction. The hole axis of the through hole 4a extends along the thrust direction. The hole axis of the through hole 4a is arranged coaxially with the hole axis of the through hole 3a. In the cross section perpendicular to the thrust direction, the shape of the through hole 4a is circular. The second portion 1b of the rotating shaft 1 is disposed inside the through hole 4a. A second bearing gap is provided between the inner peripheral surface of the through hole 4 a and the outer peripheral surface of the first portion 1 a of the rotating shaft 1.

  The second bearing sleeve 4 is provided with a part of the flow passage 14 that continues to the second bearing gap. One end of the portion located in the second bearing sleeve 4 in the flow passage 14 is arranged so as to continue to the second bearing gap, and the other end is arranged on the outer circumferential surface of the second bearing sleeve 4 in the radial direction. .

  The first housing assembly 5 is provided with a through hole 5a. The through hole 5a passes through the first housing assembly 5 in the thrust direction. The hole axis of the through hole 5a extends along the thrust direction. The hole axis of the through hole 5a is arranged coaxially with the central axis of the rotating shaft 1, for example. The inner peripheral surface of the through hole 5 a is disposed so as to face the outer peripheral surface of the first bearing sleeve 3. That is, the first bearing sleeve 3 is disposed inside the through hole 5a.

  The portion located on the rear side of the first housing assembly 5 protrudes in the radial direction from the portion located on the front side of the first housing assembly 5. The portion located on the rear side of the first housing assembly 5 faces the plurality of rotary blades 1e of the rotary shaft 1 in the thrust direction.

  A part of the flow passage 13 is provided in a portion located on the rear side of the first housing assembly 5. A part of the flow passage 14 is provided in a portion located on the front side of the first housing assembly 5. A part of the flow passage 14 provided in the first housing assembly 5 is connected to the first bearing gap and the third bearing gap via a part of the flow passage 14 provided in the first bearing sleeve 3.

  The second housing assembly 6 is disposed at a distance from the first housing assembly 5 in the thrust direction. The second housing assembly 6 is provided with a through hole 6a. The through hole 6a passes through the second housing assembly 6 in the thrust direction. The hole axis of the through hole 6a extends along the thrust direction. The hole axis of the through hole 6a is arranged coaxially with the hole axis of the through hole 5a. The inner peripheral surface of the through hole 6 a is disposed so as to face the outer peripheral surface of the second bearing sleeve 4. That is, the second bearing sleeve 4 is arranged inside the through hole 6a.

  A part of the flow passage 14 is provided in the second housing assembly 6. A part of the flow passage 14 provided in the second housing assembly 6 is connected to the second bearing gap via a part of the flow passage 14 provided in the second bearing sleeve 4.

  The first cover 7 is provided with a through hole 7a. The through hole 7a penetrates the first cover 7 in the thrust direction. The hole axis of the through hole 7a extends along the thrust direction. The hole axis of the through hole 7a is arranged coaxially with the central axis of the rotating shaft 1, for example. The inner peripheral surface of the through hole 7 a is disposed so as to face the outer peripheral surface of the first housing assembly 5. That is, the first housing assembly 5 is disposed inside the through hole 7a.

  A part of the flow path 13 is provided in the first cover 7. Furthermore, a part of the flow passage 14 is provided in the first cover 7. A part of the flow passage 14 provided in the first cover 7 includes a branch portion in which one flow passage is branched into two flow passages on the inner peripheral side in the radial direction. One of the flow passages branched inside the first cover 7 in the flow passage 14 passes through the first bearing gap 3 and the first bearing gap 3 through each part of the flow passage 14 provided in the first bearing sleeve 3 and the first housing assembly 5. It is connected to the third bearing gap. The other flow passage branched in the first cover 7 in the flow passage 14 is formed through each part of the flow passage 14 provided in the holding portion 10, the second bearing sleeve 4, and the second housing assembly 6. 2 It is connected to the bearing gap.

  On the surface of the first cover 7 located on the front side in the thrust direction, a positioning portion for holding a relative position with the holding portion 10 described later in the direction perpendicular to the thrust direction, that is, in the radial direction and the circumferential direction. May be provided. For example, a plurality of convex portions protruding forward from the surface may be provided on the surface of the first cover 7 positioned on the front side in the thrust direction.

  The second cover 8 is disposed at a distance from the first cover 7 in the thrust direction. The second cover 8 is provided with a through hole 8a. The through hole 8a passes through the second cover 8 in the thrust direction. The hole axis of the through hole 8a extends along the thrust direction. The hole axis of the through hole 8a is arranged coaxially with the hole axis of the through hole 7a. The inner peripheral surface of the through hole 8 a is disposed so as to face the outer peripheral surface of the second housing assembly 6. That is, the second housing assembly 6 is disposed inside the through hole 8a.

  A part of the flow path 14 is provided in the second cover 8. A part of the flow passage 14 provided in the second cover 8 is connected to the second bearing gap via each part of the flow passage 14 provided in the second bearing sleeve 4 and the second housing assembly 6. .

  On the surface of the second cover 8 positioned on the rear side in the thrust direction, positioning for holding a relative position with the holding portion 10 described later in the direction perpendicular to the thrust direction, that is, in the radial direction and the circumferential direction. A part may be provided. For example, a plurality of convex portions that protrude rearward from the surface may be provided on the surface of the second cover 8 located on the rear side in the thrust direction.

  The lock portion 9 is arranged between the first bearing sleeve 3 and the second bearing sleeve 4, between the first housing assembly 5 and the second housing assembly 6, and between the first cover 7 and the second cover 8 in the thrust direction. It is arranged between.

  As shown in FIGS. 1 and 3, the lock portion 9 includes a pin 9a, an elastic member 9b, a maintenance tap 9c, and a lid portion 9d. The lock portion 9 is disposed inside a through hole 10b of the holding portion 10 to be described later.

  The pin 9a which is a fixing member includes a shaft portion and a flange portion. Each central axis of the shaft portion of the pin 9a and the flange portion extends along the radial direction. The central axis of the shaft portion of the pin 9a is arranged coaxially with the central axis of the flange portion. In the pin 9a, the flange portion is connected to the end portion of the shaft portion on the outer peripheral side in the radial direction. The flange portion of the pin 9a protrudes outward with respect to the central axis rather than the shaft portion of the pin 9a. In the cross section perpendicular to the radial direction, the maximum width of the flange portion of the pin 9a is larger than the maximum width of the shaft portion of the pin 9a.

  At least a part of the shaft portion of the pin 9a can be disposed inside the plurality of openings 1d. That is, the circumferential width of the shaft portion of the pin 9a is equal to or smaller than the circumferential width of the plurality of openings 1d, and the thrust direction width of the shaft portion of the pin 9a is the thrust direction of the plurality of openings 1d. Or less. The cross-sectional shape perpendicular to the extending direction of the central axis of the shaft portion of the pin 9 is, for example, a circular shape. The material constituting the pin 9 includes, for example, iron (Fe). Preferably, the material constituting the pin 9 is a relatively high strength material, for example, hardened steel. The strength can be evaluated by, for example, bending strength or hardness.

  The elastic member 9b has one end and the other end, and can generate an elastic force according to a change in the distance between the one end and the other end. The elastic member 9b is, for example, a spring. One end of the elastic member 9b is connected to a holding portion 10 described later, and movement toward the inner peripheral side in the radial direction is restricted by the holding portion 10. The other end of the elastic member 9b is connected to the flange portion of the pin 9a. Thereby, the elastic member 9b can give the elastic force which urges | biases the pin 9a toward the outer peripheral side of a radial direction with respect to the pin 9a.

  A screw hole 9e (see FIG. 3) having a hole axis along the radial direction is provided at an end of the pin 9a on the outer peripheral side in the radial direction. For example, a maintenance tap 9c is provided on the flange portion of the pin 9a. The screw hole 9e is formed in the maintenance tap 9c.

  The lid portion 9d is arranged on the outer peripheral side in the radial direction with respect to the pin 9a, the elastic member 9b, and the maintenance tap 9c. The lid portion 9d only needs to have an arbitrary configuration as long as the movement of the pin 9a to the outer peripheral side in the radial direction is limited and a part of the flow passage 16 can be configured. For example, the lid portion 9d is provided with a through hole penetrating in the radial direction. Thereby, the movement to the outer peripheral side of the radial direction of the pin 9a is restrict | limited by the cover part 9d. Further, the through hole of the lid portion 9d forms a space 10g (a part of the flow passage 16) in which the lock portion driving gas for driving the lock portion 9 can be circulated on the outer peripheral side of the pin 9a. The lock portion driving gas supplied to the space 10g can apply a force toward the inner side in the radial direction to the pin 9a.

  The lock portion 9 is provided so as to be switchable between a first state in which the pin 9a is arranged outside the opening 1d and a second state in which the pin is arranged inside the opening 1d. Switching between the first state and the second state is controlled by the presence or absence of gas supply to the space 10g disposed on the outer peripheral side of the pin 9a inside the holding unit 10. In the first state, the pin 9a is accommodated in a through hole 10b of the holding unit 10 described later, and does not protrude inward from the inner peripheral surface of the through hole 10a of the holding unit 10. In the first state, the tip portion of the pin 9a is disposed, for example, inside the inner peripheral portion of the through hole 10b. In the second state, the pin 9 a protrudes inward from the inner peripheral surface of the through hole 10 a of the holding portion 10. In the second state, a force directed from the outside in the radial direction to the inside is applied to the pin 9a by the pressure of the gas supplied into the through hole of the lid portion 9d. The elastic member 9b in the second state is more compressed and biased than the elastic member 9b in the first state.

  The lock unit 9 is held by the holding unit 10. The holding portion 10 is disposed between the first bearing sleeve 3 and the second bearing sleeve 4, between the first housing assembly 5 and the second housing assembly 6, and between the first cover 7 and the second cover 8. Has been.

  As shown in FIGS. 1 and 2, the holding portion 10 is provided with a through hole 10 a. The through hole 10a penetrates the holding part 10 in the thrust direction. The hole axis of the through hole 10a extends along the thrust direction. The hole axis of the through hole 10a is arranged coaxially with the central axis of the rotating shaft 1, for example. The inner peripheral surface of the through hole 10a is disposed to face the outer peripheral surface of the third portion 1c of the rotating shaft 1 with a gap in the radial direction. That is, the third portion 1c of the rotating shaft 1 is disposed inside the through hole 10a, and the circumferential direction is between the inner peripheral surface of the through hole 10a and the outer peripheral surface of the third portion 1c of the rotating shaft 1. A gap is provided in a row.

  As shown in FIGS. 1 to 3, the holding portion 10 is further provided with a through hole 10 b. The through hole 10b penetrates the holding part 10 in the radial direction. One end of the through hole 10 b opens on the inner peripheral surface of the through hole 10 a, and the other end of the through hole 10 b opens on the outer peripheral surface of the holding unit 10.

  As shown in FIG. 1 and FIG. 2, the through hole 10 b is provided so that the hole diameter of the inner peripheral portion located inside in the radial direction is smaller than the hole diameter of the outer peripheral portion located outside in the radial direction. . The hole diameter of the inner peripheral portion of the through hole 10b is larger than the outer diameter of the shaft portion of the pin 9a, but smaller than the outer diameter of the flange portion of the pin 9a and the outer diameter of the elastic member 9b. The lock portion 9 is disposed inside the outer peripheral portion of the through hole 10b, but only the shaft portion of the pin 9a is movable inside the inner peripheral portion of the through hole 10b. Thereby, the movement of the lock portion 9 toward the inner peripheral side in the radial direction is restricted by the holding portion 10.

  The hole diameter of the inner peripheral portion of the through hole 10 b may be smaller than the circumferential length of each of the plurality of openings 1 d of the rotating shaft 1. The hole diameter of the inner peripheral portion of the through hole 10b may be equal to or greater than the length in the circumferential direction of each of the plurality of openings 1d of the rotating shaft 1.

  As shown in FIGS. 1 to 3, the other end of the through hole 10b of the holding part 10 is reduced in diameter by a lid part 9d. The lid portion 9d is detachably fixed to the through hole 10b, for example. The lid portion 9d is fitted into the through hole 10b, for example.

  As shown in FIGS. 1 to 3, the holding portion 10 is further provided with a through hole 10 c. The through hole 10c penetrates the holding part 10 in the radial direction. One end of the through hole 10 c is opened on the inner peripheral surface of the through hole 10 a, and the other end of the through hole 10 c is opened on the outer peripheral surface of the holding unit 10. The through hole 10 c is not connected to the through hole 10 b inside the holding portion 10. The through hole 10 c communicates with the through hole 10 b through the gap provided between the inner peripheral surface of the through hole 10 a and the outer peripheral surface of the third portion 1 c of the rotating shaft 1. The through hole 10c is arranged at a distance from the through hole 10b in the circumferential direction. The hole diameter of the through-hole 10c is smaller than the hole diameter of the said outer peripheral part of the through-hole 10b, for example.

  As shown in FIG. 3, the holding portion 10 is further provided with a through hole 10 d. The through hole 10d penetrates the holding part 10 in the thrust direction. One end of the through hole 10d opens on a surface located on the rear side of the holding portion 10 that faces the surface located on the front side of the first cover 7. One end of the through-hole 10d is opened on a surface located on the front side of the holding unit 10 that faces the surface located on the rear side of the second cover 8. The through hole 10d is not connected to the through holes 10a, 10b, and 10c inside the holding portion 10.

  A part of the flow passage 14 is provided in the holding unit 10. A part of the flow passage 14 provided in the holding part 10 is constituted by a through hole 10d. Further, the holding unit 10 is provided with a part of the flow passage 16. A part of the flow passage 16 provided in the holding part 10 is constituted by a through hole 10b and a through hole 10c.

  Positioning portions for holding a relative position with respect to the first cover 7 or the second cover 8 in the direction perpendicular to the thrust direction, that is, in the radial direction and the circumferential direction, are provided on both end surfaces of the holding portion 10 in the thrust direction. It may be provided. For example, as illustrated in FIG. 2, a plurality of recesses 10 e that are recessed with respect to the surface may be provided on the surface located on the front side of the holding unit 10. The plurality of concave portions 10e may be provided so as to be able to fit into the plurality of convex portions of the second cover 8. A plurality of recesses recessed with respect to the surface may be provided on the surface located on the rear side of the holding unit 10. The plurality of recesses may be provided so as to be fitted to each of the plurality of protrusions of the first cover 7.

  The third bearing sleeve 11 is provided with a through hole 11a, and the through hole 11a penetrates the third bearing sleeve 11 in the thrust direction. The hole axis of the through hole 11a extends along the thrust direction. The hole axis of the through hole 11a is arranged coaxially with the central axis of the rotating shaft 1 and the hole axis of the through hole 3a. The front surface of the third bearing sleeve 11 is disposed so as to face the rear surface of the thrust plate portion of the rotating shaft 1. A fourth bearing gap is provided between the front surface of the third bearing sleeve 11 and the rear surface of the thrust plate portion of the rotating shaft 1. A part of the flow passage 15 is provided in the third bearing sleeve 11.

  The nozzle plate 12 has a front-facing surface 12 a that faces the rear-facing surface of the thrust plate portion of the rotating shaft 1 in the thrust direction. Furthermore, the nozzle plate 12 is provided with a through-hole 12b that opens to a front surface 12a. The through hole 12b penetrates the nozzle plate 12 in the thrust direction. The hole axis of the through hole 12b extends along the thrust direction. The hole axis of the through hole 12b is arranged coaxially with the central axis of the rotating shaft 1 and the hole axis of the through hole 3a. The hole diameter of the front portion of the through hole 12 b is smaller than the outer diameter of the thrust plate portion of the rotating shaft 1. The inner peripheral surface of the front portion of the through hole 12 b is disposed so as to face the outer peripheral surface of the third bearing sleeve 11. The third bearing sleeve 11 is disposed inside the front portion of the through hole 12b. A part of the flow path 15 is provided in the nozzle plate 12. A part of the flow passage 15 provided in the nozzle plate 12 is connected to the fourth bearing gap via a part of the flow passage 15 provided in the third bearing sleeve 11.

  The nozzle plate 12 further has a convex portion that protrudes to the front side in the thrust direction from the front surface 12a. The front surface of the convex portion of the nozzle plate 12 is disposed to face the rear surface of the first cover 7 in the thrust direction. A part of the flow passage 13 is provided on the convex portion of the nozzle plate 12.

  The nozzle plate 12 is provided with a rotation sensor insertion port 12c. The rotation sensor insertion port 12c penetrates the nozzle plate 12 in the thrust direction.

  The air supply port of the flow passage 13 is provided on a surface located on the rear side of the nozzle plate 12. The exhaust port of the flow passage 13 is provided on the outer peripheral surface of the first cover 7. The air supply port of the flow passage 14 is provided, for example, on the outer peripheral surface of the first cover 7. In the flow passage 14, a portion that is continuous with the first bearing gap and the third bearing gap and a portion that is continuous with the second bearing gap are connected, for example, inside the first cover 7. Specifically, a portion of the flow passage 14 that is continuous with the second bearing gap passes through the inside of the second cover 8 and the holding portion 10, and the first bearing in the flow passage 14 provided in the first cover 7. It is connected to the portion that continues to the gap and the third bearing gap. The air supply port of the flow passage 15 is provided on a surface located on the rear side of the nozzle plate 12. An air supply port and an exhaust port of the flow passage 15 are provided on the outer peripheral surface of the holding unit 10. An air supply port and an exhaust port of the flow passage 16 are provided on the outer peripheral surface of the holding unit 10. The air supply port of the flow passage 16 is the through hole 10 b of the holding unit 10, and the exhaust port of the flow passage 16 is the through hole 10 c of the holding unit 10.

  The housing 2 can support the rotary shaft 1 in a non-contact manner in the radial direction by the static pressure of the gas supplied to the first bearing gap and the second bearing gap via the flow passage 14. That is, the first bearing sleeve 3 and the second bearing sleeve 4 can constitute a journal bearing.

  Further, the housing 2 causes the rotating shaft 1 to move in the thrust direction by the static pressure of the gas supplied to the third bearing gap via the flow passage 14 and the static pressure of the gas supplied to the fourth bearing gap via the flow passage 15. It can be supported in a non-contact manner. That is, the first bearing sleeve 3 and the third bearing sleeve 11 can constitute a thrust bearing.

  The flow path 16 is separated from the flow path 13, the flow path 14, and the flow path 15 by, for example, a plurality of O-rings 19 (see FIG. 1). One O-ring 19 is disposed between the outer peripheral surface of the first housing assembly 5 and the inner peripheral surface of the through hole 7 a of the first cover 7. One O-ring 19 is disposed in the flow passage 13 and the flow passage 14 in front of the flow passage between the branch portion inside the first cover 7 and the first bearing gap and the third bearing gap. Another O-ring 19 is disposed between the outer peripheral surface of the second housing assembly 6 and the inner peripheral surface of the through hole 8 a of the second cover 8. Another O-ring 19 is disposed on the rear side of the flow passage 14 with respect to the flow passage between the branch portion inside the first cover 7 and the second bearing gap.

<Configuration of painting equipment>
FIG. 4 is a cross-sectional view showing a spindle holder 41 to which the spindle device 100 is attached in the coating apparatus 200 according to the embodiment. FIG. 5 is a cross-sectional view showing the spindle device 100 to which the cup 40 is attached in the coating apparatus 200 according to the embodiment. The coating apparatus 200 includes a spindle device 100, a cup 40, and a spindle holder 41.

  The cup 40 is attached to the front end portion of the rotary shaft 1. The spindle holder 41 is provided with a receiving portion 41a into which at least a part of the housing 2 of the spindle device 100 can be inserted. The surface of the receiving portion 41 a facing inward in the radial direction is provided so as to be able to contact the outer peripheral surface of the first cover 7 and the holding portion 10 and a part of the outer peripheral surface of the second cover 8.

  The spindle holder 41 includes a turbine gas supply port 42 for supplying rotation driving gas to the flow passage 13 of the spindle device 100, and a turbine gas exhaust port 43 for exhausting rotation driving gas from the flow passage 13. The bearing gas supply port 44 for supplying the bearing gas to the flow passage 14, the bearing gas supply port 45 for supplying the bearing gas to the flow passage 15, and the lock driving gas to the flow passage 16 A lock gas supply port 46 for supplying gas, a lock gas exhaust port 47 for exhausting lock portion driving gas from the through hole 10c, a paint supply port 48 for supplying paint, and a rotation sensor are inserted. An insertion port 49 is provided.

  A paint spray nozzle 50 is attached to the paint supply port 48. The paint spray nozzle 50 is inserted into the through hole 1 f of the rotating shaft 1 with the spindle device 100 attached to the spindle holder 41, and the tip thereof is disposed in the cup 40. A rotation sensor 51 is inserted into the insertion port 49.

<Operation of spindle device and coating device>
When the driving gas is supplied into the flow passage 13 from the turbine gas supply port 42 of the spindle holder 41, the rotary shaft 1 and the cup 40 rotate in the circumferential direction. At this time, the bearing gas is supplied into the flow passages 14 and 15 from the bearing gas supply ports 44 and 45, so that the rotary shaft 1 is rotatably supported by the housing 2 without contact.

  When the paint is supplied into the cup 40 from the paint supply port 48 via the paint injection nozzle 50, the paint spreads outside the cup 40 due to the centrifugal force generated by the rotation of the cup 40, and is atomized when leaving the cup 40. When the atomized paint arrives at the surface to be coated, painting using the painting apparatus 200 is performed.

  At this time, the lock portion driving gas is not supplied to the flow passage 16 of the spindle device 100, and the lock portion 9 is in the first state in which the pin 9a is disposed outside the opening 1d. .

  When the cup 40 is cleaned or replaced after the completion of painting, the lock portion 9 is changed from the first state to the second state, and the rotary shaft 1 is locked. Specifically, the lock portion driving gas is supplied into the flow passage 16 from the lock gas supply port 46 of the spindle holder 41. The lock portion driving gas is, for example, compressed air. The lock portion driving gas reaches the flange portion of the pin 9a through the through hole of the lid portion 9d, and presses the pin 9a toward the inside in the radial direction. Pressure exceeding the elastic force which the elastic member 9b provides to the pin 9a is applied to the pin 9a by the lock portion driving gas. Thereby, the pin 9a is inserted into one of the plurality of openings 1d provided in the third portion 1c of the rotating shaft 1, and the lock portion 9 is switched from the first state to the second state. As the lock portion driving gas is continuously supplied to the flow passage 16, the lock portion 9 is maintained in the second state.

  After the replacement work of the cup 40 is completed, the supply of the lock portion driving gas to the flow passage 16 is stopped. Accordingly, the pin 9a is pressed outward in the radial direction by the elastic member 9b, and the lock portion 9 is switched from the second state to the first state.

  Supply of the lock portion driving gas to the flow passage 16 can be controlled by a solenoid valve (not shown) arranged outside the spindle holder 41. The lock portion 9 can be in the first state when the electromagnetic valve is closed, and can be in the second state when the electromagnetic valve is opened.

<Effect>
The spindle device 100 is disposed in the housing 2 and in the housing 2 and is located between the first portion 1a, the second portion 1b, and the first portion 1a and the second portion 1b in the thrust direction. And a rotating shaft 1 including a portion 1c. One or more openings 1d are arranged on the outer peripheral surface of the third portion 1c of the rotating shaft 1. The one or more openings 1 d have a pair of inner walls facing each other in the rotation direction of the rotation shaft 1. The housing 2 faces the first portion 1a in the radial direction, faces the first journal bearing portion that pivotally supports the rotary shaft 1, and faces the second portion 1b in the radial direction, and It includes a second journal bearing portion that is pivotally supported, and one lock portion 9 that is disposed between the first journal bearing portion and the second journal bearing portion in the thrust direction. The lock portion 9 has a pin 9a as a fixing member that can be disposed in any one of the one or more openings 1d, and the first state in which one or more pins 9a are disposed outside the opening 1d. And a second state in which the pin 9a is disposed inside the one or more openings 1d.

  According to the spindle device 100, the rotation of the spindle (rotary shaft 1) can be locked by the lock portion 9 included in the housing 2. Therefore, the spindle device 100 is suitable for a spindle device for electrostatic coating or the like where it is difficult to secure a space necessary for installing the spindle lock device outside.

  Furthermore, according to the spindle device 100, since the pin 9a can be disposed near the rotary shaft 1, the radial length of the pin 9a can be shortened. The pin 9a having a reduced radial length has a high strength against bending, for example.

  In the spindle apparatus 100, the housing 2 further includes a holding part 10 that holds the lock part 9. According to the spindle device 100, the lock unit 9 can be easily replaced by replacing the holding unit 10. In particular, when the housing 2 includes a plurality of lock portions 9, the plurality of lock portions 9 can be replaced together by exchanging the holding portion 10.

  In the spindle device 100, the lock portion 9 is provided so as to be switched from the first state to the second state when the pin 9a receives the gas pressure.

  The manufacturing cost of the spindle device 100 is lower than the manufacturing cost of the spindle device of the comparative example in which the lock portion is provided so as to be electromagnetically controllable. Furthermore, the spindle device 100 is more suitable for a spindle device for electrostatic coating than the spindle device of the comparative example in which the lock portion is provided so as to be electromagnetically controllable. This is because, in the electrostatic coating spindle device, a high voltage of tens of thousands of volts is applied to the paint passing through the interior thereof, and the spindle device 100 prevents discharge inside the electrostatic coating spindle device. Because you get.

  In the spindle device 100, the lock portion 9 further includes an elastic member 9b that applies an elastic force to the pin 9a in the radial direction. The first state is held by the elastic member 9b.

  In the spindle apparatus 100, the first state can be held only by the elastic force. Therefore, the spindle device 100 can hold the first state more stably than the spindle device in which the first state is held by gas pressure or electromagnetic force.

  In the spindle device 100, a screw hole 9e having a hole axis along the radial direction is provided at an outer peripheral end portion of the pin 9a in the radial direction.

  In the spindle device 100, for example, when the pin 9a is deformed and cannot be removed from one or more openings 1d of the rotary shaft 1, by pulling out the bolt connected to the screw hole 9e to the outer peripheral side in the radial direction, It is possible to switch from the second state to the first state.

  In the spindle device 100, at least one of the material constituting the rotary shaft 1 and the material constituting the pin 9a includes hardened steel. In the spindle device 100, at least one of the rotating shaft 1 and the pin 9a has high strength. Therefore, the generation | occurrence | production and deformation | transformation of the damage | wound with respect to at least any one of the rotating shaft 1 and the pin 9a can be suppressed.

<Modification>
In the spindle apparatus 100, the housing 2 includes only one lock portion 9, but the present invention is not limited to this. As shown in FIGS. 6 to 9, the housing 2 may include a plurality of lock portions 9. The holding part 10 is provided with a plurality of through holes 10b, and each lock part 9 is accommodated in each through hole 10b. In the spindle device 100, the rotary shaft 1 can rotate by inertia even after the supply of the rotation driving gas to the rotary shaft 1 is stopped. Further, even after the inertial rotation of the rotating shaft 1 is settled, the rotating shaft 1 may continue to rotate due to the action of gas supplied to the static pressure gas bearing or so-called shaving air. In these cases, since it is necessary to lock the rotating shaft 1 while the rotating shaft 1 continues to rotate, a load is applied to each lock portion 9. In the spindle device in which the housing 2 includes a plurality of lock portions 9, the load on each lock portion 9 when the first state is changed to the second state is reduced as compared with the case where only one lock portion 9 is provided. obtain. As the number of the lock portions 9 increases, the load applied to one lock portion 9 can be reduced.

  For example, as shown in FIG. 6, the housing 2 may include two lock portions 9. For example, the two lock portions 9 may have a rotational symmetry of 180 degrees around the central axis of the rotary shaft 1.

  As shown in FIG. 7, the housing 2 may include four lock portions 9. The four lock portions 9 may have a rotational symmetry of 90 degrees around the central axis of the rotary shaft 1, for example. As shown in FIG. 7, for example, the opening 1 d of the rotating shaft 1 may have a rotational symmetry of 60 degrees around the central axis of the rotating shaft 1. As shown in FIG. 7, when the rotational symmetry of the plurality of openings 1d and the rotational symmetry of the plurality of lock portions 9 are not the same, at least a part of the lock portion 9 is disposed inside the opening 1d. By doing so, the first state can be switched to the second state. For example, only one pair of lock portions 9 may be disposed inside the opening 1d among the two pairs of lock portions 9 that are opposed to each other in the radial direction across the central axis.

  As shown in FIG. 8, for example, when the rotational symmetry of the plurality of lock portions 9 is the same as the rotational symmetry of the plurality of openings 1 d, all of them are switched from the first state to the second state. The lock portion 9 can be disposed inside the opening 1d. In this case, the holding | maintenance part 10 should just be equipped with a structure as shown in FIG. The holding part 10 is provided with a plurality of through holes 10 b for accommodating each of the plurality of lock parts 9.

  In the spindle device 100, the lock portion driving gas is a part of the rotating shaft driving gas, but is not limited thereto. The lock portion driving gas may be a part of the bearing gas, for example.

  In the spindle device 100, the bearing gas is supplied to the first bearing sleeve 3 and the second bearing sleeve 4 through the flow passage branched from the single flow passage 14, but the invention is not limited thereto. The flow passage for supplying the bearing gas to the first bearing sleeve 3 and the flow passage for supplying the bearing gas to the second bearing sleeve 4 may be configured independently of each other.

  In the spindle apparatus 100, a portion not configured as a bearing is disposed between the first journal bearing and the second journal bearing, and an arbitrary configuration is provided as long as a lock portion is disposed in the portion. obtain. For example, the holding unit 10 may be provided integrally with the first bearing sleeve 3 and the second bearing sleeve 4.

  Although the embodiment of the present invention has been described above, the above-described embodiment can be variously modified. Further, the scope of the present invention is not limited to the above-described embodiment. The scope of the present invention is defined by the terms of the claims, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  The above embodiment is particularly advantageously applied to a spindle device used in a coating apparatus.

  DESCRIPTION OF SYMBOLS 1 Rotating shaft, 1a 1st part, 1b 2nd part, 1c 3rd part, 1d opening part, 1e rotary blade, 1f through-hole, 2 housing, 3 1st bearing sleeve, 3a, 4a, 5a, 6a, 7a, 8a, 10a, 10b, 10c, 10d, 11a, 12b Through hole, 4 Second bearing sleeve, 5 First housing assembly, 6 Second housing assembly, 7 First cover, 8 Second cover, 9 Lock portion, 9a Pin , 9b Elastic member, 9c Maintenance tap, 9d Lid, 9e Screw hole, 10 Holding part, 10e Recess, 10g Space, 11 Third bearing sleeve, 12 Nozzle plate, 12a Front-facing surface, 12c Rotation sensor insertion port, 13, 14, 15, 16 Flow path, 19 O-ring, 40 cups, 41 Spindle holder, 41a Receiving part, 42 Turbine gas supply , 43 Turbine gas exhaust port, 44, 45 Bearing gas supply port, 46 Lock gas supply port, 47 Lock gas exhaust port, 48 Paint supply port, 49 Insertion port, 50 Paint injection nozzle, 51 Rotation sensor, 100 Spindle device 200 coating equipment.

Claims (7)

A housing;
A rotating shaft that is disposed inside the housing and includes a first portion, a second portion, and a third portion located between the first portion and the second portion in the thrust direction;
One or more openings are disposed on the outer peripheral surface of the third portion of the rotating shaft,
The one or more openings have a pair of inner walls facing each other in the rotation direction of the rotation shaft,
The housing is
A first journal bearing portion facing the first portion in the radial direction and supporting the rotating shaft;
A second journal bearing portion facing the second portion in the radial direction and supporting the rotating shaft;
Including one or more lock portions disposed between the first journal bearing portion and the second journal bearing portion in the thrust direction;
The one or more lock portions include a fixing member that can be disposed inside the one or more openings, and the fixing member is disposed outside the one or more openings. The spindle device is provided so as to be switchable between a second state in which the fixing member is disposed inside the one or more openings.   The spindle device according to claim 1, wherein the housing further includes a holding portion holding the one or more lock portions.   The spindle device according to claim 2, wherein the one or more lock portions are provided to be switchable from the first state to the second state when the fixing member receives a gas pressure. The one or more lock portions further include an elastic member that applies an elastic force in the radial direction to the fixing member,
4. The spindle device according to claim 1, wherein the first state is held by the elastic member. 5.   The spindle device according to any one of claims 1 to 4, wherein a screw hole having a hole axis along the radial direction is provided at an outer peripheral end portion of the fixing member in the radial direction.   The spindle device according to claim 1, wherein the housing includes a plurality of the lock portions.   The spindle device according to any one of claims 1 to 6, wherein at least one of a material constituting the rotating shaft and a material constituting the fixing member includes hardened steel.

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