Centrifugal drying method and centrifugal dryer

Abstract

To dehydrate the inside of a blind hole of a work piece by centrifugal drying.SOLUTION: There is provided a centrifugal drying method of drying a drying object 5 comprising a plurality of blind holes 5b, 5d, which method is carried out by placing a drying object 5 on a rotary table 15, in a first attitude 6 in which the opening of the first blind hole 5b among the plurality of blind holes 5b, 5d faces downward, and thereafter rotating the drying object 5 in the first attitude 6 together with the rotary table 15, on a rotary shaft 1 extending in the vertical direction.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a method for centrifugal drying of an object to be dried having a blind hole, and a centrifugal dryer. [Background technology]

[0002] A cleaning and dehydration device has been proposed in which a workpiece fixed with a jig on a rotating table installed in a cleaning chamber is cleaned with air and water emitted from a blow nozzle and a water fountain nozzle, and the workpiece is dehydrated by the centrifugal force of the rotating table (Patent Application No. 8-304083, hereinafter referred to as Patent Document 1). Summary of the Invention [Problem to be solved by the invention]

[0003] According to the cleaning and dehydration device of Patent Document 1, after cleaning, air is blown into the tapped holes of the workpiece, and the rotary table is rotated at high speed to dehydrate it. In order to blow air, the air needs to be compressed, which requires a large amount of power. If compressed air is supplied from the factory, the amount of electricity increases due to pressure loss. The present invention aims to dehydrate the inside of a blind hole in a workpiece by centrifugal drying. [Means for solving the problem]

[0004] The first aspect of the present invention is A method for centrifugal drying of an object to be dried having a plurality of blind holes, comprising the steps of: The object to be dried is placed on a turntable in a first position in which an opening of a first blind hole among the plurality of blind holes faces downward; The object to be dried in the first position is rotated together with the turntable around a rotation axis extending in a vertical direction. This is a centrifugal drying method.

[0005] A second aspect of the present invention is A centrifugal dryer for centrifugally drying an object to be dried having a plurality of blind holes, A rotating table that rotates around a rotation axis extending in the vertical direction; a tilting table that is installed on the rotating table and tilts around a tilting axis extending in a horizontal direction; a tilting device capable of tilting the object to be dried about the tilting axis between a first position in which an opening of a first blind hole among the plurality of blind holes faces downward and a second position in which a second blind hole, the opening of which faces in a direction different from that of the first blind hole, faces downward; The centrifugal dryer has a

[0006] A third aspect of the present invention is A method for centrifugal drying of an object to be dried having a plurality of blind holes, comprising the steps of: The object to be dried is placed on a turntable in a first position in which an opening of a first blind hole among the plurality of blind holes faces downward; The object to be dried in the first position is rotated together with the turntable around a rotation axis extending in a vertical direction; The tilting device moves to a connecting position, and connects the fourth coupling of the tilting device to the third coupling of the tilting table, while the second pusher moves to push the clamp shaft into the release position inside the hollow tilting shaft, and the locking body is pulled out from the receiver of the rotating table, and the tilting table is allowed to rotate freely; The tilting device moves to a retracted position, and the fourth coupling moves away from the third coupling, and the clamp shaft moves to a holding position by the elastic force of the elastic body, and the locking body is inserted into the receiver, thereby supporting the attitude of the tilting table. This is a centrifugal drying method.

[0007] Downward includes vertically downward. The rotating platform can rotate the tilting table while holding it in a first position or a second position. The tilt angle is, for example, 180 degrees or 90 degrees. For example, when the second blind hole opens in a tilted direction in the first attitude, the second attitude may be achieved by tilting the second blind hole so that it faces vertically downward. The tilt device may include an advancing / retracting device that moves the support bracket forward and backward between the retracted position and the connected position. The tilt driver may be supported on a support bracket. The tilting device tilts the tilting table to a first position, a second position, or a third position. The position maintaining unit maintains the tilting table in the first position, the second position, or the third position.

[0008] The locking body may have a number of protrusions. The protrusions may extend, for example, radially with respect to the tilt axis. The receiver may have a number of recesses. The receiver is fitted with the locking body. The recesses may extend, for example, radially with respect to the tilt axis. The locking body and the receiver may be a coupling that is joined at a cylindrical end surface. The locking body and the receiver may be an end surface of a part of a cylinder centered on the tilt axis. The locking body may have convex teeth. The receiver may have concave teeth. Effect of the Invention

[0009] According to the present invention, the inside of the blind hole of the workpiece can be dehydrated by centrifugal drying. [Brief description of the drawings]

[0010] [Figure 1] Cross-sectional view of the dryer of embodiment 1 [Diagram 2] Plan view of the dryer of embodiment 1 [Diagram 3] FIG. 1 is a perspective view of a coupling according to a first embodiment; [Figure 4] Enlarged view of part IV in Fig. 1 [Diagram 5] FIG. 1 is a cross-sectional view showing a state in which the tilting table of the first embodiment is tilted. [Figure 6] Cross section of line VI-VI in Figure 1 [Figure 7] Centrifugal Drying Test Method for Example 1 [Figure 8] Centrifugal Drying Test Method for Example 2 [Figure 9] Cross-sectional view of a dryer according to a second embodiment [Figure 10] Enlarged view of part X in Figure 9 [Figure 11] FIG. 11 is a cross-sectional view showing the tilting state of the tilting table of the second embodiment. [Figure 12] Enlarged view of part XII in Fig. 11 DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] <Embodiment 1> As shown in Fig. 1 and Fig. 2, the dryer 10 of this embodiment includes a stand 11, a motor 13, a bearing 12, a rotating table 15, a tilting table 17, a tilting device 24, a first coupling 19, a second coupling 31, a position maintaining unit 36, a dry air source 47, and a nozzle 49. Fig. 1 is a cross-sectional view taken along line II in Fig. 2. The downward direction in Fig. 1 is the rightward direction of the dryer 10. The rightward direction in Fig. 1 is the upward direction of the dryer 10. Moreover, the direction from the front to the back of the paper in Fig. 1 is the rearward direction of the dryer 10.

[0012] The motor 13 is disposed on the underside of the stand 11. The motor 13 is, for example, a PM motor. The motor 13 can stop the rotating table 15 at an original position 91 (see FIG. 2). The motor 13 rotates the rotating table 15 at a rotational speed of preferably 200 rotations per minute or more, more preferably 250 rotations per minute or more.

[0013] The rotating table 15 has a support shaft 15d, a connecting plate 15a, and side plates 15b and 15c. The support shaft 15d rotates around the rotating shaft 1. The rotating shaft 1 extends in the vertical direction. The connecting plate 15a is disposed on the upper surface of the support shaft 15d and extends in the horizontal direction. The side plates 15b and 15c are disposed on the left and right ends of the connecting plate 15a and extend upward and in the front-rear direction. The bearing 12 is disposed on the frame 11 and supports the support shaft 15d. The trunnion receivers 16a and 16b are disposed at the upper ends of the side plates 15b and 15c, respectively.

[0014] The tilting table 17 has a top plate 17a, side plates 17b and 17c, trunnions 17d and 17e, and a pin 17f. The top plate 17a extends in the front-rear and left-right directions. The side plates 17b and 17c extend upward and in the front-rear direction from the left and right ends of the top plate 17a. The trunnions 17d and 17e are disposed at the upper ends of the side plates 17b and 17c, respectively. The trunnion 17d is supported by the trunnion receiver 16a and penetrates the side plate 15b. The trunnion 17e is supported by the trunnion receiver 16b. The trunnions 17d and 17e are disposed around the tilting axis 3. The pin 17f extends upward from the top plate 17a. The pin 17f supports the workpiece (object to be dried) 5. In the original position 91, the tilt axis 3 extends to the left and right.

[0015] The workpiece 5 has a lower surface 5a, an upper surface 5c, blind holes 5b and 5d, and a center of gravity 5e. The lower surface 5a has a blind hole (first blind hole) 5b. The upper surface 5c has a blind hole (second blind hole) 5d. Preferably, the number of blind holes 5b on the lower surface 5a is greater than the number of blind holes 5d on the upper surface 5c.

[0016] The tilting device 24 has an advance / retract guide 25 , a support bracket 27 , an advance / retract device 28 , and a tilting driver 29 . The advance / retract guide 25 is disposed on the base 11 and extends in the left-right direction. The advance / retract guide 25 is, for example, a linear motion guide. The support bracket 27 is L-shaped when viewed from the front. The support bracket 27 is disposed on the advance / retract guide 25. The support bracket 27 is guided by the advance / retract guide 25.

[0017] The advancing / retracting device 28 is disposed on the stand 11. The advancing / retracting device 28 is, for example, a fluid cylinder, an electric cylinder, or a servo motor / ball screw mechanism. The advancing / retracting device 28 is connected to the support bracket 27. The advancing / retracting device 28 reciprocates the support bracket 27 between a retracted position 93 and a connected position 92 (see FIG. 5 ). When the advancing / retracting device 28 moves the support bracket 27 to the retracted position 93, the second coupling 31 moves away from the first coupling 19, allowing the rotating table 15 to rotate freely.

[0018] The tilt driver 29 has an output shaft 29a. The output shaft 29a may be a hollow shaft. The tilt driver 29 is, for example, a motor or a rotary cylinder. The tilt driver 29 may be a lever and a cylinder. Here, the lever extends radially from the tilt shaft 3 and is connected to the output shaft 29a. The cylinder extends circumferentially around the tilt shaft 3 and is connected to the lever.

[0019] The first coupling 19 is connected to the trunnion 17d. The second coupling 31 is connected to the output shaft 29a. As shown in FIG. 3, the first coupling 19 is cylindrical. The first coupling 19 has a claw 19a and a groove 19b at an end. The claws 19a and the grooves 19b are arranged alternately on the circumference. The second coupling 31 has a claw 31a, a groove 31b, and an input shaft 31c. When the support bracket 27 is in the connection position 92, the claw 31a abuts against the groove 19b. Then, the claw 19a abuts against the groove 31b. As a result, the first coupling 19 and the second coupling 31 mesh with each other and rotate together.

[0020] The dry air source 47 is, for example, a blower. The dry air source 47 may generate hot air. The nozzle 49 has a plurality of nozzles 49a. The nozzles 49a are arranged facing the workpiece 5. The plurality of nozzles 49a are, for example, evenly arranged vertically.

[0021] As shown in FIG. 4, the posture maintaining part 36 has a plunger chamber 39, a through hole 38, a plurality of pin holes 40 (three in FIG. 6), a plunger 37, an elastic body 41, a release lever 43, and a pusher 45. The rotating base 15 has a plunger chamber 39. The plunger chamber 39 is cylindrical and extends in the left-right direction. The plunger chamber 39 opens radially inward with respect to the rotating shaft 1. The through hole 38 extends coaxially with the plunger chamber 39. The through hole 38 penetrates from the radial outside of the side plate 15b to the plunger chamber 39.

[0022] The pin hole 40 is disposed in the tilt table 17. The pin hole 40 extends coaxially with the plunger chamber 39. For example, as shown in Fig. 6, the pin hole 40 is disposed at positions rotated by 90 degrees around the trunnion 17d. The plunger 37 is cylindrical. The plunger 37 passes through the plunger chamber 39 and the through hole 38. The plunger 37 has a pin 37a, a stem 37b, and a head 37c. The pin 37a reciprocates in the left-right direction within the plunger chamber 39. The pin 37a slides in the plunger chamber 39. The head 37c is disposed radially outward of the side plate 15b with respect to the rotating shaft 1. The stem 37b connects the pin 37a and the head 37c.

[0023] The elastic body 41 is disposed in the plunger chamber 39 and biases the plunger 37 radially inward. The elastic body 41 is, for example, a compression coil spring. At this time, the plunger 37 is located at the insertion position 94. The release lever 43 has a fulcrum 43a, a force point 43b, and an action point 43c. The fulcrum 43a is located at the center of the release lever 43 and is supported by the side plate 15b so as to be able to swing. The force point 43b is located at the upper end of the release lever 43. The force point 43b is, for example, fork-shaped and supports the stem 37b by sandwiching it between the stem 37b. The force point 43b supports the head 37c from the radially inner side, for example. The force point 43b may have a pin 44. The pin 44 supports the force point 43b so as to be able to swing with the head 37c and the stem 37b. The action point 43c is located at the lower end of the release lever 43.

[0024] 1, 4, 5 and 6, a method of using the dryer 10 will be described. As shown in Fig. 1, an operator places the workpiece 5 on the tilting table 17. Then, the motor 13 rotates the rotating table 15 to centrifugally dry the workpiece 5. Liquid adhering to the underside 5a of the workpiece 5, the sides of the workpiece 5, and the inside of the blind holes 5b opening in the underside of the workpiece 5 is ejected from the workpiece 5 by centrifugal force. During the centrifugal drying, the nozzle 49 may spray dry air toward the workpiece 5.

[0025] The motor 13 then stops the rotating table 15 at the original position 91 . Next, as shown in Fig. 5, the advancing / retracting device 28 moves the support bracket 27 to the connection position 92. At this time, the pusher 45 presses the action point 43c of the release lever 43. Then, the force point 43b pulls the plunger 37 out of the pin hole 40 against the elastic force of the elastic body 41. In addition, the second coupling 31 is coupled to the first coupling 19. This allows the tilt driver 29 to tilt the tilt table 17. At this time, the plunger 37 is located at the extraction position 95.

[0026] In Fig. 6, the tilting table 17 and the workpiece 5 are shown in a first position 6 by solid lines. The tilting table 17 and the workpiece 5 are shown in a second position 7 and a third position 8 by two-dot chain lines. Here, the second position 7 is a state in which the tilting table 17 is tilted 180 degrees. The third position 8 is a state in which the tilting table 17 is tilted 90 degrees. As shown in Fig. 6, when the tilting table 17 is in the second position 7 and the third position 8, one of the three pin holes 40 faces the plunger 37.

[0027] After the tilt driver 29 tilts the tilt table 17 to the second position 7, the advance / retract device 28 moves the support bracket 27 to the retracted position 93. At this time, the elastic body 41 biases the plunger 37 in a direction to insert it into the pin hole 40. Therefore, as the pusher 45 moves away from the rotating base 15, the tilt of the release lever 43 returns to its original position, and the plunger 37 is inserted into the pin hole 40. When the support bracket 27 further moves to the right, the second coupling 31 moves away from the first coupling 19. Then, the tilt table 17 is supported in the second position 7. The second coupling 31 and the pusher 45 retract to the outside of the rotation radius of the tilt table 17.

[0028] In the first position 6, the blind hole 5d (see FIG. 1) that was on the upper surface of the workpiece 5 opens below the workpiece 5 in the second position 7. In this state, the motor 13 rotates the turntable 15 again to centrifugally dry the workpiece 5. Gravity and centrifugal force act on the liquid in the blind hole 5d. This causes the liquid in the blind hole 5d to fly out of the workpiece 5. During the centrifugal drying, the nozzle 49 may spray dry air toward the workpiece 5.

[0029] The motor 13 stops the rotating table 15 at the original position 91. Next, the advancing / retracting device 28 moves the support bracket 27 to the connecting position 92. Next, the tilting device 24 returns the tilting table 17 to the first position 6. Finally, the advancing / retracting device 28 moves the support bracket 27 to the retracted position 93.

[0030] Instead of centrifugal drying in the second position 7, centrifugal drying may be performed in the third position 8. Moreover, after centrifugal drying in the second position 7, centrifugal drying in the third position 8 may be further performed.

[0031] According to the drying method using the dryer 10 of this embodiment, when the workpiece 5 is centrifugally dried in the first position 6, the blind holes 5b opening on the lower surface of the workpiece 5 and the side surfaces are dried. However, the blind holes 5d opening on the upper surface of the workpiece 5 are difficult to dry. Therefore, the workpiece 5 is rotated 180 degrees to the second position 7. Then, the blind holes 5d open downward. When the workpiece 5 is centrifugally dried in this state, the blind holes 5d are dried. Furthermore, during the centrifugal drying, the nozzle 49 blows dry air onto the workpiece 5, thereby efficiently drying the workpiece 5.

[0032] The tilting device 24 reciprocates between a connection position 92 and a retracted position 93. When the tilting device 24 is at the connection position 92, the release lever 43 pulls the plunger 37 out of the pin hole 40, thereby allowing the tilting table 17 to tilt freely. When the tilting device 24 is at the connection position 92, the second coupling 31 is connected to the first coupling 19. This allows the tilting device 24 to tilt the tilting table 17. Furthermore, when the tilting device 24 moves to the retracted position 93, the release lever 43 returns to its original position due to the elastic force of the elastic body 41, and the plunger 37 is inserted into the pin hole 40. Then, the second coupling 31 moves away from the first coupling 19. As a result, the tilting table 17 is supported by the rotating base 15. The tilting device 24 is separated from the rotating base 15. In this way, according to the dryer 10 of this embodiment, the tilting table 17 and the tilting device 24 can be connected or disconnected by a simple mechanism. The tilting table 17 can be tilted only when the tilting table 17 and the tilting device 24 are connected. When the tilting device 24 is disconnected from the tilting table 17, the attitude of the tilting device 24 is locked.

[0033] In Patent Document 1, the blind holes on the top surface of the workpiece had to be blown away by air blowing. According to this embodiment, by tilting the tilting table 17, the blind holes 5d on the top surface of the workpiece 5 when installed (first position 6) face downward in the second position 7. This allows the blind holes 5d to be dried by centrifugal drying. Therefore, almost all the blind holes in the workpiece 5 can be dried by rotary drying. While a large amount of electricity is required to generate and spray compressed air, the drying method using the dryer 10 of this embodiment allows the amount of electricity to be reduced.

[0034] Preferably, in the first posture 6, the workpiece 5 is positioned so that the center of gravity 5e of the workpiece 5 is located near the rotation axis 1. The tilting device 24 tilts the tilting table 17 180 degrees around the tilting axis 3. Then, in the second posture 7, the center of gravity 5e of the workpiece 5 is also located near the rotation axis 1. Since the center of gravity 5e is located near the rotation axis 1 in both the first posture 6 and the second posture 7, the inertia of the rotating part is reduced.

[0035] When the rotating table 15 rotates, the tilting device 24 is separated from the rotating table 15. This reduces the inertia of the rotating table 15. The tilting device 24 is also connected to the base 11 by an electric cable and air piping. If the tilting device 24 rotates together with the rotating table 15, it would be difficult to connect the electric cable and air piping. Since the tilting device 24 is separated from the rotating table 15 when the rotating table 15 rotates, piping and wiring around the tilting device 24 becomes easier.

[0036] The dryer 10 of this embodiment has a dry air source 47 and a nozzle 49. The nozzle 49 injects dry air toward the workpiece 5 during centrifugal drying. This allows the workpiece 5 to be dried efficiently. A blower consumes less power than an air compressor. By using the dry air source 47, which is a blower, the amount of power consumption can be reduced. EXAMPLES

[0037] (Test Method) As shown in FIG. 7, a centrifugal drying test was performed on a workpiece 51. The workpiece 51 has a female thread 53. The workpiece 51 rotates around a rotation axis 1 extending in the vertical direction. The axis of the female thread 53 intersects with the rotation axis 1. The female thread 53 faces outward in the horizontal direction. The distance from the mouth of the female thread 53 to the rotation axis 1 is defined as a rotation radius 55. The female thread 53 was filled with tap water and rotated at a constant rotation speed for 24 seconds. Three drying tests were performed under one condition.

[0038] (Test Results) The test results are shown in Table 1. Here, "A" indicates that no water remains. "B" indicates that there is a small amount of water remaining at the mouth of the female thread 53. "C" indicates that there is water remaining at the bottom of the hole or throughout the entire hole. Rotation speed 125 min -1 This allowed water to be removed from the female threads of M10 and M12. Rotation speed: 175 min -1 This allowed the water to be removed from the M8 female thread. Rotation speed: 250 min -1 Then, the removal of water from the M6 ​​female thread was observed. [Table 1] EXAMPLES

[0039] (Test Method) As shown in FIG. 8, the workpiece 57 was centrifugal dried. The workpiece 57 has female threads 59 and 61. The workpiece 57 rotates around a rotation axis 1 extending in the vertical direction. The female thread 59 opens vertically upward. The female thread 61 opens vertically downward. The distance from the axis of the female threads 59 and 61 to the rotation axis 1 is defined as a rotation radius 63. The female thread 59 was filled with tap water and rotated at a constant rotation speed for 24 seconds. Next, the female thread 61 was filled with tap water and rotated at a constant rotation speed for 24 seconds.

[0040] (Test Results) The test results for the upward female thread 59 are shown in Table 2. The notation in the table is the same as in Example 1. Water remained on the female thread 59 under all conditions. [Table 2]

[0041] The test results for the downward female thread 61 are shown in Table 3. For M12, water fell before the workpiece 57 was rotated. This is indicated by "-". For M10, the rotation speed was 80 min -1 This allowed the water to be removed. For M8, the rotation speed was 125 min -1 The water was removed by the above. For M6 and M5, the rotation speed was 200 min -1 The water was removed by the above. For M4, the rotation speed was 250 min -1 And the water could be removed. [Table 3]

[0042] In the sensory tests described above, the inventors discovered for the first time that spin drying is possible for blind holes (female threads) that open downward. The spin speed was 200 min -1 More than 250min is preferable. -1 The above is more preferable.

[0043] <Embodiment 2> 9, the dryer 100 of the present embodiment has a tilting table 117, a third coupling 119, a fourth coupling 131, and a posture maintaining unit 136, instead of the tilting table 17, the first coupling 19, the second coupling 31, and the posture maintaining unit 36 ​​of the dryer 10 of the first embodiment. The other configurations of the dryer 100 are substantially the same as those of the dryer 10 of the first embodiment.

[0044] 9 and 10, the tilt table 117 has a top plate 17a, side plates 117b and 17c, trunnions (hollow tilt shafts) 117d and 17e, a pin 17f, a clamp chamber 117g, a cover 117h, and a through hole 117k. In the following, the radially outer side (lower side in FIG. 10) seen from the rotating shaft 1 is called the centrifugal direction, and the radially inner side (upper side in FIG. 10) is called the centripetal direction. Also, the radial direction seen from the tilt shaft 3 is simply called the radial direction.

[0045] The trunnion 117d is hollow cylindrical and extends along the tilt axis 3. The trunnion 117d has a spring chamber 139. The spring chamber 139 is cylindrical and has its center on the tilt axis 3. The spring chamber 139 opens in the centrifugal direction of the trunnion 117d. The clamp chamber 117g is disposed on the centripetal direction side of the side plate 117b. The clamp chamber 117g may be open to the centripetal side of the side plate 117b. The clamp chamber 117g is in a disk shape centered on the tilt axis 3. The clamp chamber 117g is connected to the spring chamber 139.

[0046] The cover 117h covers the opening of the clamp chamber 117g and is fastened to the side plate 117b. The through hole 117k extends parallel to the tilt axis 3. The through hole 117k penetrates the side plate 117c in the centrifugal direction from the clamp chamber 117g. A plurality of (for example, four) through holes 117k may be arranged. The through holes 117k are arranged rotationally symmetrically (for example, four-fold rotationally symmetrically) with respect to the tilt axis 3.

[0047] The third coupling 119 has a through hole 119a and is hollow cylindrical. The through hole 119a is connected to the spring chamber 139. The fourth coupling 131 is substantially identical to the second coupling 31 of the first embodiment.

[0048] As shown in FIG. 10, the attitude maintaining section 136 has a pusher 145, a clamp shaft 165, a locking pin (locking body) 137, a compression coil spring (elastic body) 167, and a locking hole (receptor) 140. The pusher 145 has a cylindrical shape and is disposed radially inside the fourth coupling 131. The pusher 145 may protrude in a centripetal direction from the fourth coupling 131. The pusher 145 moves integrally with the fourth coupling 131.

[0049] The clamp shaft 165 has a reciprocating shaft 165a, an abutment portion 165b, a stopper 165c, and a flange 165d. The clamp shaft 165 is a rotating body centered on the tilting shaft 3. The reciprocating shaft 165a and the stopper 165c are disposed inside the spring chamber 139. The clamp shaft 165 reciprocates between a release position 96 (see FIG. 12) in the centripetal direction and a holding position 97 in the centrifugal direction. The stopper 165c protrudes radially outward from the outer diameter of the reciprocating shaft 165a. The stopper 165c is disposed at the distal end of the reciprocating shaft 165a. When the tilting device 24 is in the retracted position 93, the stopper 165c abuts against the distal end of the spring chamber 139.

[0050] The abutment portion 165b protrudes in the centrifugal direction from the stopper 165c. The abutment portion 165b may protrude from the distal end of the trunnion 117d. The flange 165d is disk-shaped and is disposed at the centripetal end of the reciprocating shaft 165a. The flange 165d is disposed within the clamp chamber 117g.

[0051] The locking pin 137 is connected to the flange 165d. The locking pin 137 extends parallel to the tilting axis 3. A plurality of (for example, four) locking pins 137 may be arranged. The plurality of locking pins 137 are arranged rotationally symmetrically (for example, four-fold rotationally symmetrically) with respect to the tilting axis 3. The locking pin 137 reciprocates in the through hole 117k together with the clamp shaft 165.

[0052] The spring 167 is disposed between the stopper 165c and the spring chamber 139. The spring 167 biases the clamp shaft 165 in the centrifugal direction. The locking holes 140 are arranged in the side plate 15b of the rotating table 15. The number of the locking holes 140 may be the same as the number of the locking pins 137. The locking holes 140 extend parallel to the tilt axis 3. A plurality of (e.g., four) locking holes 140 may be arranged. The multiple locking holes 140 are arranged in rotational symmetry (e.g., four-fold rotational symmetry) with respect to the tilt axis 3.

[0053] 9 and 10, when the tilting device 24 is in the retracted position 93, the clamp shaft 165 moves to the retaining position 97, and the locking pin 137 is inserted into the locking hole 140. As a result, the tilt angle of the tilting table 117 is maintained. At this time, the rotating platform 15 is rotatable.

[0054] 11 and 12 show the state where the tilting device 24 has moved to the connection position 92. When the tilting device 24 moves from the retracted position 93 toward the connection position 92, the fourth coupling 131 is first connected to the third coupling 119. When the tilting device 24 moves further, the pusher 145 hits the abutment portion 165b of the clamp shaft 165. Then, the pusher 145 pushes the clamp shaft 165 in the centripetal direction. When the tilting device 24 reaches the connection position 92, the clamp shaft 165 moves to the release position 96. At this time, the locking pin 137 is completely pulled out from the locking hole 140. This allows the tilting table 117 to be tilted. At this time, the tilting driver 29 can rotate the tilting table 117 via the fourth coupling 131, the third coupling 119, and the trunnion 117d.

[0055] After the tilting device 24 rotates the tilting table 117, the tilting device 24 moves to the retracted position 93. Then, the clamp shaft 165 moves and the locking pin 137 is inserted into the locking hole 140. At this time, the tilting table 117 is locked. After that, the fourth coupling 131 moves away from the third coupling 119. When the tilting device 24 reaches the retracted position 93, the rotating base 15 becomes rotatable.

[0056] The contact portion 165b of the clamp shaft 165 does not have to protrude from the trunnion 117d. At this time, when the clamp shaft 165 is in the connected position 92, the pusher 145 penetrates the through hole 119a of the third coupling 119 and pushes the contact portion 165b in the centripetal direction.

[0057] Instead of the locking pin 137 and the locking hole 140, a pair of Hirth couplings or a pair of curvilinear couplings may be arranged. For example, the first Hirth coupling (locking body) is arranged on the distal end surface of the side plate 117b, centered on the tilting axis 3. The first Hirth coupling (locking body) is connected to the flange 165d by a stem penetrating the side plate 117b. The second Hirth coupling (receptor) is arranged on the centripetal end surface of the side plate 15b, centered on the tilting axis 3. When the clamp shaft 165 is at the connection position 92, the first Hirth coupling is coupled with the second Hirth coupling to hold the tilting table 117. The first Hirth coupling may have convex or concave teeth.

[0058] Also, instead of the locking pin 137, a part of the convex teeth constituting the Hirth coupling may be arranged. In this case, instead of the locking hole 140, a Hirth coupling having concave teeth may be arranged. A Hirth coupling having concave teeth may have concave teeth on the entire circumference. The locking body may be part of the concave teeth, and the receiver may be part of the convex teeth.

[0059] According to the dryer of this embodiment, the attitude maintaining section 136 can be configured compactly.

[0060] The present invention is not limited to the above-described embodiment, and various modifications are possible without departing from the gist of the present invention, and all technical matters included in the technical ideas described in the claims are the subject of the present invention. The above-described embodiment shows a preferred example, but a person skilled in the art can realize various alternatives, modifications, variations, or improvements from the contents disclosed in this specification, and these are included in the technical scope described in the attached claims. [Explanation of symbols]

[0061] 1 Rotation axis 3 Tilt axis 5. Materials to be dried 5b, 5d blind hole 15 Rotating table 17 Tilting Table

Claims

1. A method for centrifugal drying of an object to be dried having a plurality of blind holes, comprising: placing the object to be dried on a turntable in a first position in which an opening of a first blind hole among the plurality of blind holes faces downward; rotating the object to be dried in the first position together with the turntable around a rotation axis extending in a vertical direction; Centrifugal drying method.

2. tilting the object to be dried about a tilting axis extending horizontally so that second blind holes, among the plurality of blind holes, whose openings face in a direction different from that of the first blind holes, face downward in a second position; rotating the object to be dried in the second attitude together with the turntable around the rotation axis; The centrifugal drying method according to claim 1 .

3. The tilting device is moved to a connecting position, and the second coupling of the tilting device is connected to the first coupling of the tilting table, and the attitude of the tilting table is made rotatable; the tilting device is moved to a retracted position to separate the second coupling from the first coupling, and a plunger is inserted into a pin hole of the tilting table to support the attitude of the tilting table. The centrifugal drying method according to claim 1 or 2.

4. tilting the object to be dried about the tilting axis so that the object is in a third position in which the second blind hole faces laterally and radially outward; rotating the object to be dried in the third attitude together with the turntable around the rotation axis; The centrifugal drying method according to claim 2.

5. The plurality of blind holes are female threads having a root diameter of 6 mm or more and 10 mm or less. The centrifugal drying method according to claim 1 or 2.

6. Dry air is blown toward the object to be dried from a nozzle disposed outside a rotation radius of the object to be dried around the rotation axis. The centrifugal drying method according to claim 1 or 2.

7. A centrifugal dryer for centrifugally drying an object to be dried having a plurality of blind holes, a rotating table that rotates around a rotation axis extending in the vertical direction; a tilting table that is installed on the rotary table and tilts around a tilting axis that extends in the horizontal direction; a tilting device that can tilt the object to be dried around the tilting axis between a first position in which an opening of a first blind hole among the plurality of blind holes faces downward and a second position in which a second blind hole, the opening of which faces in a direction different from that of the first blind hole, faces downward; A centrifugal dryer having

8. The tilting device is a first coupling disposed on the tilt shaft; a second coupling disposed on the tilting device, the second coupling being capable of reciprocating between a connected position where the second coupling is connected to the first coupling and a retracted position where the second coupling is separated from the first coupling and allows the second coupling to rotate when the rotary table is in its original position; a tilting driver connected to the second coupling and configured to rotate the second coupling; a position holding unit disposed on the tilting device and configured to hold the tilting table in either the first position or the second position; The centrifugal dryer of claim 7, further comprising:

9. the attitude maintaining unit allows rotation of the tilting table when the second coupling is in the connected position, and restricts rotation of the tilting table when the second coupling is in the retracted position. The centrifugal dryer according to claim 8.

10. The attitude maintaining unit is a forward / backward guide extending in the axial direction of the first coupling; a support bracket that is disposed in the advance / retreat guide, supports the second coupling, and moves integrally with the second coupling between the connected position and the retracted position; a pin hole disposed on the tilting table; a plunger disposed on the rotating table, the plunger being capable of reciprocating between an insertion position where the plunger is inserted into the pin hole and an extraction position where the plunger is removed from the pin hole; an elastic body that biases the plunger from the insertion position toward the extraction position; a pusher disposed on the support bracket; a release lever that withdraws the plunger from the pin hole when the support bracket moves to the connected position, a fulcrum that is swingably supported on the rotating table; an action point pushed by the pusher; A force point at which the plunger is pulled out; a release lever having The centrifugal dryer according to claim 8 or 9, comprising:

11. A method for centrifugal drying of an object to be dried having a plurality of blind holes, comprising: placing the object to be dried on a turntable in a first position in which an opening of a first blind hole among the plurality of blind holes faces downward; rotating the object to be dried in the first position together with the turntable around a rotation axis extending in a vertical direction; the tilting device moves to a connecting position, and connects the fourth coupling of the tilting device to the third coupling of the tilting table; the second pusher moves to push the clamping shaft into the hollow tilting shaft and into the release position; the locking body is pulled out from the receiver of the rotating table, and the tilting table is allowed to rotate; The tilting device moves to a retracted position, the fourth coupling moves away from the third coupling, and the clamp shaft moves to a holding position by the elastic force of the elastic body, the locking body is inserted into the receiver, and the attitude of the tilting table is supported. Centrifugal drying method.

12. the locking body is a locking pin, The receiver is a locking hole. The centrifugal drying method according to claim 11.

13. a hollow tilting shaft extending around the tilting shaft, disposed on the tilting table, and supported by the rotating base; The tilting device is a receiver extending parallel to the tilt axis and disposed on the rotating base; a clamp shaft disposed inside the hollow tilt shaft, the clamp shaft moving back and forth along the tilt shaft between a holding position located radially outward as viewed from the rotation shaft and a release position located radially inward; a locking body connected to the clamping shaft, the locking body being inserted into the receptacle when the clamping shaft moves to the holding position and being removed from the receptacle when the clamping shaft moves to the release position; a third coupling disposed on the hollow tilt shaft; an elastic body that biases the clamp shaft from the release position toward the holding position; a fourth coupling disposed on the tilting device, the fourth coupling being capable of reciprocating between a connected position where the fourth coupling is connected to the third coupling and a retracted position where the fourth coupling is separated from the third coupling and allows the rotary table to rotate when the rotary table is in its original position; a pusher that is disposed radially inside the fourth coupling with respect to the tilt axis and that pushes the clamp shaft into the release position when the fourth coupling moves to the connected position; having The centrifugal dryer according to claim 7.

14. the third coupling has a through hole extending along the tilt axis, The clamp shaft or the pusher passes through the through hole, and the pusher can abut against the clamp shaft. The centrifugal dryer according to claim 13.

15. the locking body is a locking pin, The receiver is a locking hole. The centrifugal dryer according to claim 13 or 14.

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