JPH0419990Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a conveyance device used in factories, warehouses, etc., and in particular, the present invention is concerned with conveyance devices used in factories, warehouses, etc. The present invention relates to a stopping device for a movable body in a conveying device that is configured to stop at a certain position.

[Prior Art] In a transport device used as an inter-process transport means on a processing or assembly line, etc., it is necessary to position and stop the transport cart with high precision at a work station where automatic machinery, transfer equipment, etc. are installed. . One of these types of positioning and stopping devices includes a positioning and stopping magnet provided on one of the conveyance path or the conveyance cart, and a secondary iron core facing the magnet on the other side.
A type of transport vehicle is known in which the transport vehicle is stopped at a predetermined position by attracting the secondary iron core using a magnet.

As this type of positioning and stopping device, a ``Linear Motor Stop Positioning Mechanism'' (Japanese Utility Model Publication No. 58-54871) was previously proposed. FIG. 5 and FIG. 6 are a perspective view and a front view, respectively, showing the structure of the invention. In these figures, reference numeral 1 denotes a positioning mechanism, which is composed of a magnetic piece 2 fixed to the side surface of a moving body (not shown) along the direction of movement (arrow direction), and an electromagnet 3 fixed at a predetermined external position. has been done. Length of magnetic piece 2 in moving direction and electromagnet 3
It is formed to have the same length in the longitudinal direction.

Then, the magnetic piece 2 and the electromagnet 3 are positioned and stopped at a position (as shown in the figure) where they exactly overlap.

[Problems to be Solved by the Invention] In the above-described positioning mechanism, the change in the centripetal force that reduces the displacement of the relative position of the magnetic piece 2 and the magnetic pole surface of the electromagnet 3 in the direction of the conveyance path is small. Therefore, there was a problem that the positioning and stopping accuracy of the moving body was poor.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a stopping device for a moving body in a conveying device that can improve the accuracy of positioning and stopping the moving body.

[Means for Solving the Problems] The present invention includes a first core having a plurality of pole teeth aligned in a line in the direction of the conveyance path and around which an excitation coil is wound; a second core having a pole tooth corresponding to the pole tooth, one of the cores is provided on the conveyance path side, and the other is provided on the moving body side that moves along the conveyance path, and the excitation coil In the device for stopping the movable body by energizing the movable body, the width of each pole tooth at both ends of each core in the conveying path direction is set to be smaller than the width of the pole tooth at the intermediate portion of each core in the conveying path direction. It is also characterized by its small size.

Further, the distance between the pole teeth at both ends of the first core and the distance between the pole teeth at both ends of the second core may be formed to have different dimensions.

[Function] According to the present invention, since the width in the transport direction of each pole tooth at both ends of the first core and each pole tooth at both ends of the second core is reduced, the suction acting between these pole teeth is reduced. The rate of change of force becomes steeper. This makes it possible to stop at a predetermined stop position extremely accurately. Further, by setting the distances between the pole teeth at both ends of each core to different dimensions, the range of the suction force is expanded, so that the suction range of the movable body can be expanded.

[Embodiment] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 and FIG. 2 are a perspective view and a front view, respectively, showing the configuration of this embodiment. In these figures, reference numeral 10 denotes a moving body stopping device, which is composed of a movable core 11, a fixed core 12, and an excitation coil 13 wound around the fixed core 12.

The movable core 11 is fixed to both sides of the bottom surface of a moving body (not shown) that moves in the direction of the arrow along the conveyance path. Small pole teeth 11a ₁ and 11a ₂ having the same rectangular parallelepiped shape are formed at both ends of the movable core 11, and a large pole tooth whose width in the conveying path direction is approximately twice that of the small pole tooth 11a ₁ is formed at the center. 11b is formed.

On the other hand, the fixed core 12 is disposed at a stop position (work station) on the conveyance path. Fixed core 12
Small pole teeth 12 having the same shape in a rectangular parallelepiped shape are provided at both ends of the
a ₁ and 12a ₂ are formed, and a large pole tooth 12b whose width in the direction of the conveyance path is approximately twice that of the small pole tooth 12a ₁ is formed in the center.
is formed. An excitation coil 13 is wound around the large pole tooth 12b, and the excitation coil 13 and the fixed core 12 constitute an electromagnet 14. The dimension of the fixed core 12 in the direction of the conveyance path is formed to be slightly shorter than the dimension of the movable core 11 in the direction of the conveyance path. This dimensional difference d is, for example, 100 mm above the above dimension of the fixed core 12.
In this case, it is about several mm. When the movable body is positioned and stopped, the small pole teeth 12a ₁ , 12 of the fixed core 12
a ₂ and the small pole teeth 11a ₁ and 11a ₂ of the movable core 11 are arranged to face each other at positions shifted by d/2 in the direction of the conveyance path (see FIG. 2).

In such a configuration, when the movable body reaches near the stop position, when the excitation coil 13 is energized, the relative positions in the conveyance direction between the corresponding pole teeth of the movable core 11 and the fixed core 12 are changed. A centripetal force acts that reduces the displacement. This will be explained with reference to FIGS. 2 and 3. The line A-A shown in FIG. 2 corresponds to the zero point of centripetal force f=0 and displacement x=0 shown in FIG. 3, and the rightward displacement x of the movable core 11 is positive,
It is assumed that the centripetal force f that tries to pull the movable core 11 back to the left is positive.

The sum of the force acting between the small pole teeth 11a ₁ and 12a ₁ at both ends of each core and the force acting between the small pole teeth 11a ₂ and 12a ₂ is represented by the broken line l ₁ , and the above displacement The centripetal force f near the zero point of x has a sharp rise. Further, the centripetal force f acting between the large pole teeth 11b and 12b is represented by a broken line _l2 .

As a result, the resultant force of each centripetal force f is expressed by the actual force l ₃ , and the resultant force near zero of the displacement x is:
Small pole teeth 11a ₁ and 12a ₁ and small pole teeth 11a ₂ and 12
The rise is even sharper than the sum of the forces acting on a ₂ . Therefore, in the vicinity of the stop position, a strong centripetal force f that reduces the displacement x of the relative position of each core 11, 12 acts, so that the positioning accuracy is improved compared to the conventional case.

Next, with reference to FIG. 4, the effect of shifting the opposed positions of each of the small pole teeth of the movable core 11 and each of the small pole teeth of the fixed core 12 when the positioning is stopped will be explained. Assuming that the movable core 11 and the fixed core 12 each have one small pole tooth, the centripetal force f and displacement of each core on the left side from the A-A line (center line) in FIG. The relationship with x is shown by the dashed line _l4 in FIG. 4, and the relationship between the centripetal force and displacement of each core on the right side is shown by the broken line _l5 . At point a where the broken line _l4 crosses the horizontal axis, that is, when the centripetal force f becomes zero, the small pole teeth 11a ₁ and 12a ₁ on the left side face each other so that the left edges of each small pole tooth coincide. Also, at point b where the broken line l ₅ crosses the horizontal axis, that is, when the centripetal force f becomes zero, the small pole teeth 11a ₂ and 12a ₂ on the right side
The right edges of each small pole tooth face each other so that they match.

Further, the relationship between the resultant force of each centripetal force f and the displacement x is shown by a solid line _l6 , and when the solid line _l6 crosses the horizontal axis at the zero point, that is, when the centripetal force f becomes zero, the movable core 11
and the fixed core 12 are opposed to each other and stopped at the normal position (FIG. 2). In this case, the displacement corresponding to the upward slope from the zero point to the peak of the solid line _l6 is _x1 , the displacement corresponding to the upward slope from point a to the peak of the broken line _l4 is _x2 ,
If x ₃ is the displacement corresponding to the upward slope from point b to the peak of broken line l ₅ , then x ₁ is longer by approximately d/2 than x ₂ and x ₃ . That is, when the positioning is stopped, the small pole teeth at both ends of the movable core 11 and the fixed core 1
Shifting the opposing position with the small pole teeth at both ends of the movable core 11 expands the range of the centripetal force that attempts to draw the movable core 11 into the normal opposing position with the fixed core 12.

According to the embodiment described above, small pole teeth are provided at both ends of each of the movable core 11 and the fixed core 12, so that the accuracy of positioning and stopping the movable body is improved. Furthermore, since the opposing positions of the small pole teeth at both ends of the movable core 11 and the small pole teeth at both ends of the fixed core 12 are shifted when the positioning is stopped, the range of centripetal force can be expanded compared to the conventional case.

In the above embodiment, the excitation side of the core is placed on the transport path side, but the excitation side may be placed on the movable body side. In addition, the dimensions of the movable core 11 in the conveyance path direction are set to the fixed core 1
Although it was formed slightly longer than the conveyance path direction dimension of 2,
It is also possible to have a configuration opposite to this.

[Effect of the invention] As explained above, according to the invention, the width in the conveying path direction of each pole tooth at both ends of the first and second cores is made smaller than the width in the conveying path direction of each pole tooth at the intermediate portion of each core. With this configuration, it is possible to improve the accuracy of positioning and stopping the moving body.

Further, since the distance between the pole teeth at both ends of the first core and the distance between the pole teeth at both ends of the second core are formed to have different dimensions, the range of centripetal force can be expanded.

[Brief explanation of the drawing]

1 and 2 are respectively a perspective view and a front view showing the configuration of an embodiment of the present invention, FIGS. 3 and 4 are diagrams for explaining the operation of the embodiment, and FIG. 6 are a perspective view and a front view, respectively, showing a conventional configuration. DESCRIPTION OF SYMBOLS 10... Stop device for a moving body, 11... Movable core (first core or second core), 12... Fixed core (second core or first core), 13... Excitation coil, 11a ₁ , 11a ₂ , 12a ₁ , 12a ₂ ...
Small pole teeth (each pole tooth at both ends of each core), 11b, 12
b... Large pole tooth (polar tooth at the middle of each core).

Claims (1)

[Claims for Utility Model Registration] (1) A first core having a plurality of pole teeth arranged in a line in the conveyance path direction and around which an excitation coil is wound, and a pole tooth of the first core. and a second core having corresponding pole teeth, one of the cores is provided on the conveyance path side, and the other is provided on the moving body side that moves along the conveyance path, and the excitation coil is energized. In the moving body stopping device, the width of each pole tooth at both ends of each core in the conveying path direction is smaller than the width of the pole tooth at an intermediate portion of each core in the conveying path direction. A device for stopping a moving body in a transport device, characterized in that: (2) Utility model registration claim 1, characterized in that the distance between the pole teeth at both ends of the first core and the distance between the pole teeth at both ends of the second core are different. A stopping device for a movable body in the conveyance device according to section 1.