JPH11314756A - Magnetic screw conveyor system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnetic screw conveyor system wherein a male side magnetic screw and female side magnetic screw both are drivable with noncontact even if a drive shaft equipped with this male side magnetic screw is formed into a long-sized one. SOLUTION: This magnetic screw conveyor system is one that utilizes a magnetic screw which rotates a drive shaft 1 constituting male side magnetic screws 6, 7 and 8 spirally polarized and formed in rotatable shaft bodies 3, 4, 4, and 5, and shifting a conveyor bed equipped with a female side magnetic screw 18, spirally polarized and formed into a curved groove surface, it is provided with two support bases 11 and 11 rotatably supporting the shaft bodies 4 and 4 among the male side magnetic screws 6, 7 and 8 plurally divided in the axial direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic screw utilizing the conversion of a rotary motion into a linear motion by the action of a magnetic force of a male magnetic screw and a female magnetic screw formed by helically magnetizing. More particularly, the present invention relates to a magnetic screw transfer device configured by dividing a male magnetic screw formed on a drive shaft.

[0002]

2. Description of the Related Art Conventionally, there has been known a magnetic screw transfer device which converts a rotary motion into a linear motion by using a magnetic screw formed by a combination of a male magnetic screw and a female magnetic screw magnetized in a spiral shape. It has been disclosed. Therefore, a conventional example of a magnetic screw conveying device disclosed in Japanese Patent Application Laid-Open No. Hei 1-209222 will be described. FIG. 5 is a cross-sectional view showing the magnetic screw transport device disclosed in this publication, and has the following configuration. The shaft 51 is rotatably supported by ball bearings 52 whose both ends are attached to a fixed portion such as a frame. On the surface of the shaft 51, strip-shaped magnets 53 of S pole and N pole are alternately spirally magnetized to form a male magnetic screw 71. A pulley 54 is fixed to one end of the shaft 51 supported by the bearing 52, and a belt 55 is stretched between the pulley 57 and the motor 56.

[0005] A carriage 58 having a cross section is provided so as to enclose a guide rod 61 and a male magnetic screw 71 provided so as not to rotate during movement. A band-shaped magnet 60 having an S pole and an N pole is also magnetized so as to be spirally wound around the cylindrical hole 59 of the transfer table 58, forming a female magnetic screw 72. In the cylindrical hole 59 through which the shaft 51 passes, the magnet 53 and the magnet 60 are arranged so as to be apart from each other by a distance a so as not to contact each other.

[0004] In the magnetic screw transport device thus configured, when the shaft 51 is rotated by the activation of the motor 56, the male magnetic screw 71 and the female magnetic screw 72 form the shaft 51.
Between the magnet 53 wound on the carrier table 58 and the magnet 60 attached to the carrier 58. Therefore, the transport table 58 moves linearly along the guide rod 61 with the rotation of the shaft 51. On the other hand, if the motor 56 is rotated in the opposite direction, the magnetic force acts on both magnets in the opposite direction, so that the carriage 58 moves backward.

[0005]

However, although the configuration of the magnetic screw transfer device has been disclosed as described above,
The reality is that it has not been put to practical use. This is because, in the magnetic screw transfer device having the conventional configuration, if the shaft 51 is made long, the shaft 51 is bent (see FIG. 6), and the transfer table 58 cannot be moved without contact. That is, the magnetic screw transport device can be used, for example, for transporting parts in a factory or for loading vegetables in a market. In such a case, it is necessary to transport a long distance linearly.

However, since the shaft 51 operates by its own weight or while the N and S poles of the male magnetic screw 71 and the female magnetic screw 72 are attracted, the attracted force causes the shaft 51 to bend. Would. Particularly, in the case where the female magnetic screw 72 has a semi-cylindrical shape that does not extend over the entire circumference, unlike the conventional example, the shaft 51
The deflection is likely to occur because the suction force is applied unevenly. Therefore, the male magnetic screw 71 and the female magnetic screw 7
2 should work in a non-contact manner, but would cause contact when moving in a bent portion. Specifically, the distance a between the two is about 0.5 mm, but when the female magnetic screw has a semi-cylindrical shape, the shaft 51 having a diameter of 15 mm is 5 mm.
When the length is 00 mm, the material is bent by the suction force and comes into contact.

Therefore, when the male magnetic screw 71 and the female magnetic screw 72 come into contact with each other, the effect of non-contact movement, which is a feature of the magnetic screw conveying device using the magnetic screw, cannot be obtained. That is, when the male magnetic screw 71 and the female magnetic screw 72 are in contact with each other, the movement thereof has no mechanical rigidity, so that the safety at the time of a collision is excellent. To eliminate mechanical friction, so that there is no wear or abrasion powder of members, transmission loss or noise, less backlash, greater freedom of stroke, and the ability to isolate the driven part from vibration of the power part, etc. In addition, various advantages not provided by the mechanical feed mechanism are lost.

Accordingly, the present invention is directed to a magnetic screw transport in which a male magnetic screw and a female magnetic screw can always be driven without contact, even if the drive shaft having the male magnetic screw is long. It is intended to provide a device.

[0009]

According to the present invention, there is provided a magnetic screw conveying device which is fitted around a rotatable shaft and is formed by alternately spirally magnetizing S-pole and N-pole band magnets. A drive shaft having a male magnetic screw, and a carriage having a female magnetic screw formed by alternately spirally magnetizing S-pole and N-pole magnets on groove surfaces corresponding to the male magnetic screw. The magnetic force acting between the male magnetic screw and the female magnetic screw converts the rotational motion of the drive shaft into the linear motion of the carrier, and the male magnetic screw moves in the axial direction. It is characterized by having a support base which is divided into a plurality of parts and which supports the shaft body between the divided male magnetic screws. In the magnetic screw transport device of the present invention, the male magnetic screw divided into a plurality of
It is preferable that the shaft is rotatably fixed to the shaft. It is preferable that the magnetic screw transport device of the present invention includes a fixing member that can fix the other male magnetic screw at a predetermined rotational position with respect to the shaft.

In the magnetic screw transport device of the present invention having the above-described structure, when the male magnetic screw is rotated by the rotation of the drive shaft, the female magnetic screw facing the male magnetic screw moves between the male magnetic screw and the male magnetic screw. It is attracted by the acting magnetic force, so that the carriage moves in the axial direction. At this time, since the drive shaft is supported by the support base at several places where the male magnetic screw is divided, the magnetic shaft attracts the drive shaft and the male magnetic screw contacts the female magnetic screw. However, the slide is always carried out in a non-contact state.

In the magnetic screw conveying device according to the present invention, each of the plurality of divided male-side magnetic screws can be rotated with respect to a shaft body before applying a rotational force to the drive shaft to slide the conveying table. State. Therefore, when the carrier is manually slid in the axial direction, the male magnetic screw is rotated by the magnetic force of the female magnetic screw formed on the carrier, so that the pitch of each male magnetic screw follows the female magnetic screw. Matches. Therefore, pitch adjustment of the divided male magnetic screws is easily performed. Further, in the magnetic screw conveying device of the present invention, the male magnetic screw can be rotated and fixed to the shaft by adjusting the fixing member, and the pitch can be easily adjusted.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the magnetic screw conveying device of the present invention will be described below in detail with reference to the drawings. FIG.
1 is a cross-sectional view of a magnetic screw transport device according to the present embodiment.
The magnetic screw transport device of the present embodiment is mainly composed of a drive shaft 1 disposed horizontally and a transport table 2 slidably provided to the drive shaft 1 to the left and right in the figure. . Therefore, first, the drive shaft 1 will be described. Drive shaft 1
The motor-side support shaft 3, the intermediate support shafts 4, 4, and the end support shaft 5 are configured so that male-side magnetic screws 6, 7, 8 are coaxially connected to each other.

The motor-side support shaft 3, the intermediate support shafts 4,
The end support shaft 4 is rotatably supported by end support stands 10 and 12 and intermediate support stands 11 and 11 erected on a base 9, respectively. Male-side magnetic screws 6, 7, 8 are rotatable on the motor-side support shaft 3, the intermediate support shafts 4, 4, and the end-portion support shaft 5, as described later.
It is formed so that it can be fixed at a predetermined position. In addition, the rotation shaft of the motor 13 for applying a rotational force to the drive shaft 1 is coaxial with the motor-side support shaft 3, the intermediate support shafts 4, 4, and the end support shaft 5. It is arranged in.

Next, the male magnetic screws 6, 7, 8 constituting the drive shaft 1 will be described in detail with reference to FIGS. FIG. 2 shows the intermediate support shaft 4 supported by the intermediate support base 11.
FIG. 4 is an enlarged sectional view of the male magnetic screws 6 and 7 pivotally supported by
FIG. 3 is a side view of the drive shaft 1. Here, the description of the male magnetic screw 8 is omitted, but the male magnetic screws 6, 7, and 8 have the same configuration. The male magnetic screws 6, 7 have rods 6 a, 7 a forming a shaft core covered with spiral cylindrical magnets 6 b, 7 b. This rod 6a,
A magnetic material (for example, iron, iron oxide, nickel, cobalt or an alloy or other compound containing these as a main component) is used for 7a. The spiral cylindrical magnet 6b,
As shown in FIG. 3, 7b has a cylindrical shape and is formed by a plurality of magnetized bands 16 spirally arranged. The adjacent magnetized bands 16 have opposite magnetization polarities. That is, if the N pole is magnetized in a certain magnetized band 16, the S pole is magnetized in the adjacent magnetized band 16.

By the way, cylindrical holes 6c and 7c are formed at both ends of the rods 6a and 7a in the axial direction so that the motor-side support shaft 3 or the intermediate support shaft 4 is inserted. Screw 1 for fixing 7 to intermediate support shaft 4
Screw holes 15 for receiving the holes 4 are formed perpendicular to the axes of the rods 6a and 7a. The intermediate support shaft 4 having such male-side magnetic screws 6 and 7 connected thereto is supported by the intermediate support base 11, and the intermediate support base 11 includes a ball bearing 11a as a bearing for the intermediate support shaft 4. The base material 11b is fixed vertically to the base 9 with screws 15.

Next, the configuration of the transfer table 2 will be described.
Here, FIG. 4 is a diagram showing the front of the magnetic screw transport device of the present embodiment. The transfer table 2 is formed of a plate material having a predetermined thickness, and a semi-cylindrical groove 2 a is formed in the center of the lower surface thereof along the axis of the drive shaft 1. And the groove 2a
A female magnetic screw 18 is formed by the spiral magnet 2b. The spiral cylindrical magnet 2b is slightly larger in diameter than the spiral cylindrical magnets 6b, 7b, 8b of the male magnetic screws 6, 7, 8 and has substantially the same structure. That is, as shown in FIG. 3, a plurality of magnetized bands 17 are spirally formed on the surface of the groove 2a, and are magnetized so that the polarities of adjacent ones are opposite. Also, two sliders 1 are provided on the lower surface of the transfer table 2 so as to be parallel with the groove 2a therebetween.
9 and 19 are fixedly provided, and are engaged so as to slide on two slide rails 20 and 20 fixedly mounted on the base 9. The sliders 19, 19 and the slide rails 20, 20
Prevents the carrier 2 from rotating about the drive shaft 1.

Next, the operation of the magnetic screw transport device having such a configuration will be described. Before operating this magnetic screw transport device, it is necessary to adjust the pitch of the male magnetic screws 6, 7, and 8 beforehand. . By the way, in the case where the male magnetic screws 6, 7, 8 are divided as in this embodiment, the female magnetic screw 18 is used to smoothly move the separated portion. It was difficult to adjust the screw pitch. For this reason, the practical use of a shape in which the male magnetic screw is divided has been actually delayed. Therefore, in the magnetic screw transfer device of the present embodiment, first, all screws 14 are loosened, and the transfer table 2 is manually slid on the male magnetic screw 6. Then, since the male magnetic screw 6 is rotated by the magnetic force, the screw 14 of the male magnetic screw 6 is tightened and fixed at an arbitrary rotation position.

Next, the carrier 2 is slid in the axial direction back on the male magnetic screw 7 while the intermediate support shafts 4 and 4 can be freely rotated in the same manner. Then, the male magnetic screw 7 is rotated by the magnetic force of the spiral magnet 2b of the carriage 2 and the spiral cylindrical magnet 7b of the drive shaft 1. Then, when the carrier 2 is located at the upper part, the screws 14 of the male magnetic screws 7 are tightened and fixed to each rod. The same is done for the male magnetic screw 8. Therefore, since the male magnetic screws 6, 7, 8 are set at the rotation positions corresponding to the female magnetic screws 18 sliding thereon, the male magnetic screws 6, 7, 8 are continuously continuous at the portions separated by the intermediate supports 11, 11. As if it is, the pitches of the magnetized bands 16 spirally magnetized are aligned.

When the positions of the male magnetic screws 6, 7, 8 of the drive shaft 1 are set as described above, the magnetic screw transport device of the present embodiment operates as follows. First, when the motor 13 is stopped and the drive shaft 1 is not rotated, the spiral cylindrical magnets 6b, 7b, 8b constituting the male magnetic screws 6, 7, 8 of the drive shaft 1 and the spiral magnet 2b of the carrier 2
, The magnetized bands 16 of the polarities that attract each other.
17 stops at the opposite position. Next, the motor 13
Is rotated through the motor-side support shaft 3, and transmitted to the male-side magnetic screws 6, 7, 8, the intermediate support shaft 4, and the end-portion support shaft 5 that are integrally fixed. Then, by the rotation of the spiral cylindrical magnets 6b, 7b, 8b, the magnetized band 17 shows a spiraling movement. With such a screwing motion,
The spiral magnet 2b of the non-rotatable carrier 2 also tries to follow. The sliders 19 and 19 are neutral with no particular force acting in the axial direction. Therefore, the carriage 2 moves in accordance with the slide rails 20 and 20 with the rotation of the drive shaft 1 and the screwing of the magnetized band 17.

As described above, the magnetic screw transport device according to the present embodiment having the above configuration has the following effects. First, the male magnetic screws 6, 7, and 8 of the drive shaft 1 are divided, and the intermediate supports 11 and 11 are provided at the separated portions. Therefore, even if the drive shaft 1 itself becomes longer, the drive shaft 1 can be maintained horizontally without bending. Can be kept. Therefore, when the magnetic screw conveying device is long, even if the distance between the male magnetic screws 6, 7, 8 and the female magnetic screw 18 is extremely small, it is possible to slide in a non-contact state without causing contact. And Further, even when the male magnetic screw is divided, it can be rotated and fixed with respect to the shafts 3, 4, 4, and 5 which are supported by the screws 14, so that the male magnetic screws 6, 7 can be rotated. , 8 can be easily adjusted in pitch.

Further, since the deflection of the drive shaft 1 is prevented, the distance between the male magnetic screws 6, 7, 8 and the female magnetic screw 18 can be further reduced. Here, the magnetic attraction increases in inverse proportion to the square of the distance between the magnetic poles as represented by the following equation. F = (1/2) U * μS / l ² U: magnetomotive force of magnet μ: magnetic permeability l: distance between magnetic poles S: area of facing magnet Therefore, if the gap is reduced to 1/2, the attractive force is 4 Thus, even if the half due to the semi-cylindrical shape of the female magnetic screw 18 is subtracted, a double suction force can be obtained. Therefore, it is possible to perform more accurate control.

It should be noted that the present invention is not limited to the above-described embodiment, and various changes can be made without departing from the gist of the present invention. For example, in the above embodiment, the drive shaft 1 is divided into three parts, but there is no problem in making the drive shaft 1 longer and dividing it further. In the embodiment, the motor-side support shaft 3, the intermediate support shafts 4, 4,
Although it is divided into the end supporting shafts 5, there is no problem because bending is not caused even if one supporting shaft is used instead.

[0023]

The magnetic screw transfer device of the present invention utilizes a magnetic screw for rotating a drive shaft having a male magnetic screw and thereby moving a transfer table having a female magnetic screw in the axial direction. There, the male magnetic screw is divided into multiple parts in the axial direction,
Since the drive shaft is rotatably supported between the divided male magnetic screws, the male magnetic screw and the female magnetic screw can be bent without causing deflection even if the drive shaft is long. It has become possible to provide a magnetic screw transport device that is driven without contact.

[Brief description of the drawings]

FIG. 1 is a diagram showing a cross section of an embodiment of a magnetic screw conveying device according to the present invention.

FIG. 2 is an enlarged sectional view of a drive shaft of the magnetic screw transport device according to the embodiment.

FIG. 3 is a diagram illustrating a partial side surface of the magnetic screw transport device according to the embodiment;

FIG. 4 is a diagram showing the front of the magnetic screw transport device of the present embodiment.

FIG. 5 is a diagram showing a cross section of a conventional magnetic screw transport device.

FIG. 6 is a diagram showing the deflection that occurs in a conventional magnetic screw transport device.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 drive shaft 2 transfer table 3 motor-side support rod 4 intermediate support rod 5 end support rod 6, 7, 8 male magnetic screw 11 intermediate support 18 female magnetic screw

Claims (4)

[Claims] 1. A drive shaft having a male magnetic screw fitted around a rotatable shaft body and formed by alternately spirally magnetizing S-pole and N-pole band-shaped magnets; A carrier provided with a female magnetic screw formed by alternately spirally magnetizing S-pole and N-pole magnets on a groove surface corresponding to the magnetic screw, and comprising a male magnetic screw and a female magnetic screw; A magnetic screw conveying device that converts the rotational motion of the drive shaft into a linear motion of a carrier table by a magnetic force acting between the male magnetic screw and the male magnetic screw. A magnetic screw transport device comprising a support for supporting the shaft between screws. 2. The magnetic screw conveying device according to claim 1, wherein the plurality of divided male magnetic screws are rotatably fixed to the shaft. apparatus. 3. The magnetic screw transport device according to claim 2, further comprising a fixing member capable of fixing the male magnetic screw at a predetermined rotational position with respect to the shaft. . 4. The magnetic screw transport device according to claim 1, wherein a groove surface of the transport base on which the female magnetic screw is formed has a substantially semi-cylindrical shape.