JPH0968260A - Magnetic screw carrier device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnetic screw carrier device which can be driven without contacting male side magnetic screws and a female side magnetic screw, even though a driving shaft furnishing the male side magnetic screws is made in a long size. SOLUTION: In this magnetic screw carrier device, a driving shaft 1 furnishing male side magnetic screws 6, 7, and 8 which are formed by magnetizing rotatable shaft bodies 3, 4, 4, and 5 in the spiral form is rotated, and a carrier board furnishing a female side magnetic screw 18 which is formed by magnetizing a bending groove surface in the spiral form is moved in the axial direction. And support boards 11 and 11 to support rotatable the shaft bodies 4 and 4 between the male side magnetic screws 6, 7, and 8 are provided.

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 conversion of rotational movement into rectilinear movement by the action of magnetic force of a male magnetic screw and a female magnetic screw formed by magnetizing in a spiral shape. The present invention relates to a carrier device, and more particularly, to a magnetic screw carrier device configured by dividing a male-side magnetic screw formed on a drive shaft.

[0002]

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

The transport base 58 whose cross section is shown is provided so as to enclose the guide rod 61 and the male magnetic screw 71 which are 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 into the cylindrical hole 59 of the carrier table 58 to form a female magnetic screw 72. Then, in the cylindrical hole 59 through which the shaft 51 penetrates, the magnet 53 and the magnet 60 are arranged so as to be spaced apart by a distance a so as not to contact each other.

In the magnetic screw conveying device thus constructed, when the shaft 51 is rotated by the activation of the motor 56, the shaft 51 is rotated by the male magnetic screw 71 and the female magnetic screw 72.
A magnetic force is generated between the magnet 53 wound around and the magnet 60 attached to the carrier 58. Therefore, the carriage 58 moves linearly along the guide rod 61 as the shaft 51 rotates. 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, and the carrier table 58 moves back.

[0005]

However, although the structure of the magnetic screw conveying device has been disclosed in the related art as described above,
The reality is that it has not been put to practical use. This is because, in the conventional magnetic screw conveyor, if the shaft 51 is made long, it will bend (see FIG. 6) and the contact table 58 cannot move without contact. That is, the magnetic screw transfer device can be used, for example, for transferring parts in a factory or for loading vegetables on the market, but in such a case, it is necessary to linearly transfer a long distance.

However, since the shaft 51 operates by its own weight, or the N pole and the S pole of the male magnetic screw 71 and the female magnetic screw 72 are attracted to each other, the attracted force causes the shaft 51 to bend. Will end up. Particularly, in the case where the female-side magnetic screw 72 does not extend over the entire circumference unlike the conventional example described above, such as a semi-cylindrical shape, the shaft 51
Since the suction force is unevenly applied to, the bending is likely to occur. Therefore, originally the male side magnetic screw 71 and the female side magnetic screw 7
Although it should act without contact with 2, it will cause contact when moving the deflected portion. Specifically, the distance a between them 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 suction force causes the bending to cause contact.

Therefore, when the male side magnetic screw 71 and the female side magnetic screw 72 come into contact with each other in this way, 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 side magnetic screw 71 and the female side magnetic screw 72 come into contact with each other, the movement has no mechanical rigidity, so that the safety at the time of a collision is excellent, and the configuration without contact portions can be achieved. Dynamic friction can be eliminated, so there is no wear of members, no generation of wear powder, no 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. However, various advantages that the mechanical feed mechanism does not have are lost.

Therefore, according to the present invention, even if the drive shaft having the male side magnetic screw is elongated, the male side magnetic screw and the female side magnetic screw can always be driven without contact. The purpose is to provide a device.

[0009]

A magnetic screw conveying device of the present invention is fitted around a rotatable shaft body and is formed by alternately magnetizing band magnets of S poles and N poles in a spiral shape. A drive shaft having a male-side magnetic screw and a carrier table having a female-side magnetic screw formed by alternately magnetizing magnets of S poles and N poles in a spiral shape on a groove surface corresponding to the male side magnetic screw. A magnetic force acting between the male-side magnetic screw and the female-side magnetic screw, which converts the rotational movement of the drive shaft into a linear movement of the carrier table, wherein the male-side magnetic screw is axially moved. It is characterized by having a support base that is divided into a plurality of portions and that supports the shaft body between the divided male side magnetic screws. In the magnetic screw carrier of the present invention, the male side magnetic screw divided into the plurality is
It is desirable that the shaft is rotatably attached to the shaft. The magnetic screw carrier of the present invention is preferably characterized by having a fixing member capable of fixing the other male magnetic screw at a predetermined rotational position with respect to the shaft body.

In the magnetic screw conveying device of the present invention having the above-mentioned structure, when the male magnetic screw is rotated by the rotation of the drive shaft, the female magnetic screw facing the male magnetic screw is between the male magnetic screw and the male magnetic screw. It is attracted by the acting magnetic force, which causes the carrier to move axially. At this time, the drive shaft is supported by the support at several places where the male magnetic screw is divided, so that the magnetic force attracts the drive shaft to bend the male magnetic screw and the female magnetic screw into contact with each other. Instead, the slide is always performed in a non-contact state.

Further, in the magnetic screw conveying device according to the present invention, the male magnetic screws divided into the plurality of parts can be rotated with respect to the shaft body before the rotational force is applied to the driving shaft to slide the conveying table. Put in a state. Therefore, when the carrier is manually slid in the axial direction, the male magnetic screws rotate due to the magnetic force of the female magnetic screws formed on the carrier, so that the pitch of each male magnetic screw follows the female magnetic screw. Match. Therefore, the pitches of the divided male side magnetic screws can be easily adjusted. Further, in the magnetic screw conveying device of the present invention, the male magnetic screw can be rotated and fixed to the shaft body by adjusting the fixing member, and the pitch can be easily adjusted.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a magnetic screw conveying device of the present invention will be described in detail below with reference to the drawings. FIG.
FIG. 4 is a cross-sectional view of the magnetic screw transport device of the present embodiment.
The magnetic screw transfer device of the present embodiment mainly includes a drive shaft 1 that is horizontally arranged and a transfer table 2 that is slidable with respect to the drive shaft 1 in the left and right directions in the drawing. . Therefore, first, the drive shaft 1 will be described. Drive shaft 1
Is configured by coaxially connecting male side magnetic screws 6, 7, and 8 by the motor side support shaft 3, the intermediate support shafts 4 and 4, and the end support shaft 5.

The motor side support shaft 3, the intermediate support shaft 4,
4, and the end support shaft 5 is rotatably supported by the end support bases 10 and 12 and the intermediate support bases 11 and 11 provided upright on the base 9, respectively. The 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 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 giving the rotation force to the drive shaft 1 and the motor side support shaft 3, the intermediate support shafts 4 and 4, and the end support shaft 5 are positioned coaxially. It is installed in.

Next, the male magnetic screws 6, 7 and 8 constituting the drive shaft 1 will be described in detail with reference to FIGS. 2 and 3. FIG. 2 shows the intermediate support shaft 4 supported by the intermediate support base 11.
It is an expanded sectional view of the male side 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 side magnetic screw 8 is omitted, but the male side magnetic screws 6, 7, and 8 have the same configuration. The male magnetic screws 6 and 7 have spiral cylindrical magnets 6b and 7b covered on rods 6a and 7a that form an axis. This rod 6a,
For 7a, a magnetic material (for example, iron, iron oxide, nickel, cobalt or an alloy containing these as the main components, or other compounds) is used. In addition, the spiral cylindrical magnet 6b,
7b has a cylindrical shape as shown in FIG. 3, and is formed of a plurality of magnetizing bands 16 arranged in a spiral shape. The adjacent magnetized bands 16 have opposite polarities of magnetization. That is, if the N pole is magnetized in a certain magnetizing band 16, the S pole is magnetized in the magnetizing band 16 adjacent thereto.

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

Next, the structure of the carrier 2 will be described.
Here, FIG. 4 is a front view of the magnetic screw transport device according to the present embodiment. The carrier 2 is formed of a plate material having a predetermined thickness, and a semicylindrical groove 2a is formed along the axis of the drive shaft 1 in the center of the lower surface thereof. And the groove 2a
A female magnetic screw 18 is formed by the spiral magnet 2b. The spiral cylindrical magnet 2b has a slightly larger diameter than the spiral cylindrical magnets 6b, 7b, 8b of the male side magnetic screws 6, 7, 8 and has a substantially similar structure. That is, as shown in FIG. 3, a plurality of magnetizing bands 17 are spirally formed on the surface of the groove 2a and are magnetized so that the polarities of adjacent magnets are opposite to each other. Further, on the lower surface of the carrier table 2, two sliders 1 are arranged in parallel with each other with the groove 2a interposed therebetween.
9 and 19 are fixedly mounted and slidably engaged with two slide rails 20 and 20 fixedly mounted on the base 9. These sliders 19 and 19 and slide rails 20 and 20
Prevents the carrier 2 from rotating around the drive shaft 1.

Next, the operation of the magnetic screw conveying device having such a structure will be described. Prior to operating the magnetic screw conveying device, it is necessary to match the pitches of the male magnetic screws 6, 7 and 8. . By the way, in the case where the male-side magnetic screws 6, 7, and 8 are configured so as to be divided as in the present embodiment, the female-side magnetic screw 18 is used to smoothly move the separated portion. It was difficult to match the screw pitch. Therefore, in practice, the practical use of the male-side magnetic screw having a divided shape has been delayed. Therefore, in the magnetic screw conveyor according to the present embodiment, first, all the screws 14 are loosened, and the conveyor 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.

Then, similarly to the male side magnetic screw 7, in a state where the intermediate support shafts 4 and 4 can be freely rotated in the same manner, the carrier base 2 is slid in the axial direction to move back. Then, the male magnetic screw 7 is rotated by the magnetic force of the spiral magnet 2b of the carrier table 2 and the spiral cylindrical magnet 7b of the drive shaft 1. Then, when the carrier table 2 is located at the upper portion, the screw 14 of the male magnetic screw 7 is tightened to fix it to each rod. The same applies to the male magnetic screw 8. Therefore, since the male side magnetic screws 6, 7, 8 are set to the rotational positions corresponding to the female side magnetic screws 18 that slide on the male side magnetic screws 6, 7, 8, they are just continuously connected at the portions separated by the intermediate support bases 11, 11. As if it were, the pitches of the magnetized bands 16 that are spirally magnetized are aligned.

When the positions of the male side magnetic screws 6, 7, 8 of the drive shaft 1 are set in this way, the magnetic screw conveying 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 forming the male side magnetic screws 6, 7, 8 of the drive shaft 1 and the spiral magnet 2b of the carrier table 2 are formed.
Magnetizing band 16 of the polarities that attract each other by the magnetic force of
17 is stopped at the opposite position. Next, the motor 13
Is rotated, the rotation is transmitted to the integrally fixed male side magnetic screws 6, 7, 8 and the intermediate support shaft 4 and the end support shaft 5 via the motor side support shaft 3. Then, due to the rotation of the spiral cylindrical magnets 6b, 7b, 8b, the magnetizing band 17 shows a spiraling motion. With such screwing motion,
The spiral magnet 2b of the carrier table 2, which cannot rotate, also tries to follow. The sliders 19 and 19 are neutral because no force acts in the axial direction. Therefore, the carrier table 2 moves along with the slide rails 20 and 20 as the magnetizing band 17 is screwed along with the rotation of the drive shaft 1.

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

Further, since the deflection of the drive shaft 1 is prevented, it becomes possible to further reduce the distance between the male side magnetic screws 6, 7, 8 and the female side magnetic screw 18. Here, the magnetic attraction force increases in inverse proportion to the square of the distance between the magnetic poles as expressed by the following equation. F = (1/2) U * μS / l ² U: Magnet magnetomotive force μ: Permeability l: Distance between magnetic poles S: Area of facing magnets Therefore, if the gap is halved, the attractive force is 4 It is doubled, and a double suction force can be obtained even by subtracting 1/2 due to the semi-cylindrical shape of the female magnetic screw 18. Therefore, it becomes possible to perform more precise control.

The present invention is not limited to the one shown in the above embodiment, and various modifications can be made without departing from the spirit of the invention. For example, although the drive shaft 1 is divided into three in the above-mentioned embodiment, there is no problem in making the drive shaft 1 longer and further dividing it. Further, in the embodiment, the motor side support shaft 3, the intermediate support shafts 4, 4,
Although the end support shaft 5 is divided, a single support shaft may be used in place of the end support shafts 5, so that there is no problem because no bending occurs.

[0023]

The magnetic screw conveying device of the present invention utilizes a magnetic screw for rotating a drive shaft having a male magnetic screw, thereby axially moving a conveying table having a female magnetic screw. Yes, the male magnetic screw is divided into multiple parts in the axial direction,
Since there is a support base that rotatably supports the drive shaft between the divided male side magnetic screws, the male side magnetic screw and the female side magnetic screw can be formed without bending 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 drawings]

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

FIG. 2 is a diagram showing an enlarged cross section of a drive shaft of the magnetic screw conveyor according to the present embodiment.

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

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

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

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

[Explanation of symbols]

 1 Drive shaft 2 Conveyor stand 3 Motor side support rod 4 Intermediate support rod 5 End support rod 6,7,8 Male side magnetic screw 11 Intermediate support stage 18 Female side magnetic screw

Claims (3)

[Claims] 1. A drive shaft having a male side magnetic screw fitted around a rotatable shaft body and formed by alternately magnetizing band magnets of S poles and N poles in a spiral shape, and the male side. A male base magnetic screw and a female magnetic screw, the carrier having a female magnetic screw formed by alternately magnetizing S and N pole magnets in a spiral shape on a groove surface corresponding to the magnetic screw. In a magnetic screw transfer device that converts the rotational motion of the drive shaft into a linear motion of the carrier by a magnetic force acting between the male side magnetic screw and the male side magnetic screw divided into a plurality of parts in the axial direction. A magnetic screw transporting device comprising a support base for supporting the shaft between screws. 2. The magnetic screw transfer device according to claim 1, wherein the plurality of divided male-side magnetic screws are rotatably attached to the shaft body. apparatus. 3. The magnetic screw transfer 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 body. .