JPH082658A - Transfer device for steel can - Google Patents

Abstract

PURPOSE:To reject a steel can which is nipped and turned down by the steel cans transferred in the horizontal direction at randon, during transfer. CONSTITUTION:A transfer device is equipped with a conveyor 4 which magnetically attracts and suspends a steel can and transfers it in the horizontal direction and a permanent magnet device 5 fixed over the transfer part of the conveyor 4. The permanent magnet device 5 is equipped with an upstream side magnet assembly body 7a, single pole magnet 7b which is perpendicular to the transfer direction and has nearly the half width of the trunk diameter of the steel can, and a downstream side magnet assembly body 7c, in this order. On each of the upstream side magnet assembly body 7a and the downstream side magnet assembly body 7c, a plurality of strip-shaped bodies whose undersurface consists of an N pole magnet strip and an S pole magnet strip in pair and extend in the transfer direction and which have the order of the magnetic poles in the width direction. The average magnetic flux density on the undersurface of the conveyor 4 in the vicinity of the single pole magnet 7b is smaller than that of the single pole magnet 7b, and the average magnetic flux density on the undersurface of the conveyor 4 in the vicinity of the single pole magnet 7 is nearly equal to that of the single pole magnet or slightly larger.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a conveying device for steel cans used for can bodies such as canned carbonated beverage cans, coffee beverage cans, juice cans, and the like. The present invention relates to a carrier device capable of rejecting a can or the like that has fallen during transfer among a large number of steel cans.

[0002]

2. Description of the Related Art Steel cans, particularly squeezed and ironed cans made of steel (hereinafter referred to as DI cans), are conventionally ironed-
After doming, they are stored in an inverted state in close contact with each other on the accumulator, and then a large number of cans are placed at a slight distance from each other at random, placed on a net conveyor, and transported horizontally. While spraying degreasing cleaning liquid, cleaning water, chemical conversion treatment liquid, cleaning water, etc. from the upper and lower nozzles in sequence, then transferred to another conveyor, and after the final water washing, it passes through the drying oven while being blown with hot air, Had been removed by drying. In the above-mentioned spraying process, a can which has fallen sideways or a can which is inclined may be generated due to a strong spray liquid pressure. These fallen cans and tilted cans have incomplete degreasing and chemical conversion treatment, incomplete removal of degreasing cleaning liquid and chemical conversion treatment liquid, and even after leaving the oven, these liquids remain in the can. However, it is not a satisfactory product because some of them remain. Further, the impure water remaining inside the collapsed can or the like scatters during the transfer process of the next step and adheres to the outer or inner surface of the nearby can. Therefore, there is a problem that a defective printing can and a defective inner coating can occur in the printing process and the inner coating process which are subsequent processes.

[0003]

DISCLOSURE OF THE INVENTION The present invention is directed to a fall can, which is placed on a feeding conveyor at random with a slight gap between them and is sandwiched between a plurality of steel cans that are horizontally transported. An object of the present invention is to provide a steel can transporting device capable of rejecting a tilted can during transport.

[0004]

SUMMARY OF THE INVENTION A steel can carrier according to the present invention comprises a conveyor for magnetically attracting and suspending a large number of steel cans for carrying in a horizontal direction, and a conveyor unit fixed to the upper part of the carrying section of the conveyor. Can transporting a steel can, comprising a permanent magnet device, the permanent magnet device comprising an upstream magnet assembly, a monopolar magnet extending at right angles to the transport direction and having a width approximately half the diameter of the steel can. The downstream magnet assembly is provided in this order, and the upstream magnet assembly and the downstream magnet assembly have a strip-shaped body having a lower surface formed of a pair of an N-pole magnetic band and an S-pole magnetic band and extending in the transport direction. , The width of the strip is equal to or slightly smaller than the diameter of the steel can, and the lower surface of the conveyor near the monopole magnet of the upstream magnet assembly. Average magnetic flux density at Smaller than the average flux density in the lower surface of the single-pole magnet near the conveyor downstream magnet assembly therewith approximately equal unipolar magnets, and wherein the slightly larger. A first small gap portion and a second small gap portion are preferably provided between the upstream magnet assembly, the downstream magnet assembly, and the monopolar magnet, respectively.
It is preferable that each upstream band, the monopolar magnet and the downstream band are housed in a case made of a non-magnetic material.

[0005]

The transporting device comprises a conveyor 4 for magnetically attracting and suspending a large number of steel cans for transporting in the horizontal direction, and a permanent magnet device fixed in the vicinity of above the transporting part of the conveyor 4. The upstream magnet assembly and the downstream magnet assembly that make up the permanent magnet device include a magnet band having an N-pole on the lower surface, and an S magnet.
A strip-shaped body consisting of a pair of pole magnet bands extending in the transport direction is
The magnetic pole order is the same in the width direction, and a plurality of them are arranged.
The width of the strip is equal to or slightly smaller than the diameter of the steel can. Therefore, a plurality of magnetic field lines 15 and 19 (FIG. 2, respectively) are provided between the magnet band having the N pole on the lower surface and the magnet band having the S pole on the lower surface without any gap over the entire lower surfaces of the upstream side magnet assembly and the downstream side magnet assembly. (See FIG. 5) is formed. Therefore, the steel can placed on the feeding conveyor (2) in an inverted state and transported at random is located at any position in the width direction (the direction perpendicular to the transport direction) below the upstream magnet assembly. However, it is adsorbed to the conveyor 4 under the action of the magnetic lines of force 15. The steel can adsorbed on the conveyor 4 slides on the lower surface of the conveyor 4 in the width direction toward the location 15a having the maximum magnetic flux density of the magnetic field lines 15, that is, the bottom boundary lines 20 and 21 of the magnet bands. As a result, by the time the steel can approaches the monopolar magnet 7b, the steel can is attracted to and suspended from the conveyor 4 substantially at both ends in the width direction of the body portion along the bottom of the bottom boundary lines 20, 20 or 21, 21. It is transported down. After passing below the unipolar magnet 7b, the normal steel can is conveyed in the same manner as described above.

The permanent magnet device comprises an upstream magnet assembly, a monopole magnet extending at right angles to the carrying direction and having a width of about half the diameter of a steel can, and a downstream magnet assembly in this order. Moreover, the average magnetic flux density on the lower surface of the conveyor near the monopole magnet of the upstream magnet assembly is smaller than that of the monopole magnet. Therefore, when the lower surface of the single-pole magnet 7b is the N pole, the magnetic field line 16 formed between the single-pole magnet 7b and the lower pole of the upstream magnet assembly 7a is the S-pole band, so that the steel can is conveyed to the conveyor 4 It is much stronger than the magnetic field lines 15 adsorbed on the lower surface (see FIGS. 2 and 5). Therefore, the steel can is attracted by the monopolar magnet 7b, rapidly slides on the lower surface of the conveyor 4 and advances, and as shown by symbol 1'in FIGS. 5 and 6, almost the first half reaches directly below the monopolar magnet 7b. . Since the conveyor 4 continues to move during that time, the steel can adsorbed to the conveyor 4 at the position where it has finished sliding approaches the downstream magnet assembly 7c as indicated by symbol 1 ". Assembly 7c
The average magnetic flux density on the lower surface of the conveyor 4 near the monopolar magnet 7b is substantially equal to or slightly larger than that of the monopolar magnet 7b. Therefore, as shown in FIGS. 5 and 6, strong magnetic lines 17 and 18 are formed between the monopolar magnet 7b and the magnet band of the S pole on the lower surface of the downstream magnet assembly 7c. The lines 17 and 18 of the magnetic flux density have the maximum magnetic flux density.
a is located at the approximate center of each line of magnetic force. Therefore, the steel can, which is relatively strongly magnetically attracted to the lower surface of the conveyor 4 and slightly passes the maximum portions 17a and 18a under inertia, slides on the lower surface of the conveyor 4 toward the maximum portions 17a and 18a and suddenly moves upstream. It is returned to the side and retreats.

As described above, a plurality of normal steel cans sandwiching a tilted can, a slanted can, etc. are attracted to the lower surface of the conveyor 4 and, when passing under the vicinity of the monopolar magnet 7b, each of them is suddenly slid forward individually. As it moves backward, tilted cans and tilted cans are rejected by being shaken from between normal steel cans. If the width of the unipolar magnet is larger than approximately half the diameter of the steel can, the magnetic flux density of the line of magnetic force between the adjacent magnets of the opposite poles will be low near the center of the unipolar magnet, and the magnetic attraction will be reduced. As a result, a normal can easily falls. On the contrary, if the width of the monopole magnet is smaller than about half of the body diameter, the magnetic field lines 17,
The portions 17a and 18a having the maximum magnetic flux density of 18 are too close to the downstream magnet assembly side, and the action of the magnetic force lines 19 makes it difficult for the steel can to suddenly return to the upstream side. When the first small gap portion 9 is provided between the upstream side magnet assembly 7a and the monopolar magnet 7b, the magnetic force lines 15 that attract the steel can to the lower surface of the conveyor 4 are provided in the first gap portion 9. With no effect, the steel can becomes slippery along the underside of the conveyor. Therefore, by setting the gap width of the first gap portion 9 to an appropriate size, the pulling length (slip advance amount) of the steel can toward the monopolar magnet 7b can be increased. Between the downstream magnet assembly 7c and the monopolar magnet 7b, the second
When the small gap portion 10 is provided, the magnetic field lines 19 that attract the steel can to the lower surface of the conveyor 4 do not act in the second gap portion 10, so that the steel can easily slips along the lower surface of the conveyor 4. Therefore, by setting the gap width of the second gap portion 10 to an appropriate size, the return length (slip-back amount) of the steel can toward the monopolar magnet can be increased. Therefore, by providing the first gap portion and the second gap portion, it is possible to increase the amount of abrupt forward and backward movements, so that it is possible to more reliably reject a fallen can or the like. Upstream band 7z, monopolar magnet 7
When b and the downstream side strip 7s are housed in the case 6 made of a non-magnetic material, the size of the steel can to be conveyed is changed, and when the diameter D changes, the changed diameter By using a case in which a predetermined band-shaped body or the like having an inner width w1 (see FIG. 2) equal to D is stored in advance, it is possible to easily switch the device in a short time.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, 1 is made of steel and has a bottom 1a and an annular projection 1a1 is formed on the DI can (see FIG. 6).
In the case of this embodiment, the DI can 1 has a body diameter of 66 m.
m, the height is 124 mm. The DI can 1 is temporarily stored in an upright state on an accumulator (not shown) after ironing-doming, and then a large number of cans are randomly placed at a slight distance from each other to form a guide roll. It is placed on the endless net conveyor 2 (hereinafter referred to as the infeed conveyor 2) equipped with 2a and fed, and degreasing cleaning liquid, cleaning water, chemical conversion liquid, cleaning water, etc. are supplied from upper and lower nozzles (not shown). While being sequentially sprayed, they are conveyed in the horizontal direction indicated by arrow A. During this time, strong spray fluid pressure can cause sideways canted or canted cans.

Reference numeral 3 denotes a magnetic attraction transport device, which is provided with an endless net conveyor 4 (hereinafter referred to as an intermediate conveyor 4) made of a non-magnetic material such as plastic, and a permanent magnet device 5. The horizontal conveyor 4a of the intermediate conveyor 4 moves in the same direction as the infeed conveyor 2, that is, in the direction of arrow A at a speed of, for example, about 3 to 4 m / min. Magnetic attraction transport device 3
An endless net conveyor 12 (hereinafter referred to as a delivery conveyor 12) provided with a guide roll 12a is provided below the vicinity of the downstream end thereof. A permanent magnet 13 is arranged below the delivery conveyor 12 near the downstream end of the magnetic attraction and conveyance device 3. The transport section 2b of the infeed conveyor 2 and the transport section 12b of the delivery conveyor 12 are horizontal and at the same level. A space 1 is provided between the guide roll 2a and the guide roll 12a.
4 are formed.

As shown in FIGS. 2 and 3, the permanent magnet device 5
Is a plurality of (15 in this embodiment) non-magnetic plate materials having a proper strength, for example, austenitic stainless steel plates (for example, SUS304 plates having a thickness of about 1 mm).
Of the elongated rectangular cases 6 closely contacting each other, the lower surface housed in each case 6 is a pair of an N-pole magnet band 7x and an S-pole magnet band 7y and extends in the transport direction.
z, a lower-side single-pole magnet piece 7b1 having a N-pole, a lower-side S-pole magnet strip 7p, and a N-pole magnet strip 7q, each pair of downstream-side strips 7s extending in the transport direction, and each strip 7
A yoke 8 made of soft iron is provided on z, 7s and the monopole magnet piece 7b1. The case 6 is a side wall plate 6.
a, an end plate 6b and a bottom plate 6c (FIGS. 2 and 3). Below each case 6, a carrier cover 11 made of the same material as the case 6 is provided. Each case 6 and carrier cover 11 are separately fixed to a fixed frame (not shown). Inner width of case 6,
Therefore, the width w1 (FIG. 2) of the strips 7z and 7s is equal to the width of the DI can 1
It is set to be equal to or slightly smaller than the body diameter D (Fig. 1). The carrier cover 11 functions as a horizontal path of the intermediate conveyor 4, that is, a guide plate in the transport unit 4a. From the upper surface of the transport section 2b of the infeed conveyor 2,
The height up to the lower surface of the conveying section 4a of the intermediate conveyor 4 is set to be slightly larger than the height of the DI can 1 (usually about 5 to 8 mm). Further, the upper surface of the carrier cover 11 and the transport section 4
The distance to the lower surface of the intermediate conveyor 4 in a is about 15 m
m.

As shown in FIGS. 1 and 3, the upstream magnet assembly 7 is composed of a plurality (15 in this embodiment) of strips 7z.
a, a monopolar magnet array 7b composed of a plurality (15 in this embodiment) of monopolar magnet pieces 7b1 extending in a line at right angles to the transport direction, and a downstream side composed of a plurality of (15 in this embodiment) strips 7s The permanent magnet assembly 7 is constituted by the magnet assembly 7c. A small gap portion 9 and a small gap portion 10 are provided between the upstream magnet assembly 7a and the downstream magnet assembly 7c and the monopole magnet array 7b, respectively. Small gap 9,10
The gap width varies depending on the body diameter D of the DI can 1, the single pole magnet array 7b and the average magnetic flux density of the upstream magnet assembly 7a and the downstream magnet assembly 7c in the vicinity thereof, but is usually about 5-1.
It is 5 mm, preferably about 8-10 mm. Small gap 9
In order to stabilize the gap width, a flat plate (not shown) made of a non-magnetic material or a very weak magnetic material close to the non-magnetic material, such as wood or plastic, is inserted in the small gap portion 10. Therefore, there is actually no gap between the upstream magnet assembly 7a and the downstream magnet assembly 7c and the monopole magnet array 7b, but these portions are magnetically relatively small gaps. Therefore, the small gap 9,
Call 10. The monopole magnet array 7b is located substantially directly above the center of the void portion 14 in the horizontal direction.

As shown in FIGS. 2 and 3, the upstream belt-shaped body 7z has magnet poles 7x and magnets 7y of equal width and length, each of which has an N pole and an S pole on its lower surface and extends in the conveying direction. It is composed of a pair of. Each strip 7z
Of the magnetic poles in the width direction, that is, in the direction perpendicular to the transport direction is the same. Although illustration is omitted, the magnet bands 7x and 7y are a combination of several kinds of magnets in height and longitudinal directions (for example, ferrite having relatively strong magnetism, plastic magnet having relatively weak magnetism, rubber magnet, etc.). Has become In this embodiment, the magnet bands 7x and 7y are used.
The lower surface of each has an N pole and an S pole,
On the contrary, the lower surfaces of the magnet bands 7x and 7y may be S poles and N poles, respectively. In the present embodiment, in the monopole magnet array 7b, all the lower surfaces of the monopole magnet pieces 7b1 constituting the monopole magnet array 7b have N poles. The width w2 of the monopole magnet array 7b is D
It is set to be approximately 1/2 of the body diameter D of the I-can 1.
All the lower surfaces of the monopole magnet pieces 7b1 may be S poles.

The strip 7s is composed of a pair of a magnet strip 7p and a magnet strip 7q whose lower surfaces are S poles and N poles and which are elongated in the carrying direction and which have the same width and length. The magnetic pole order in the width direction of each strip 7s is the same. Although not shown, the magnet bands 7p and 7q are composed of a combination of several kinds of magnets, like the magnet band 7x. In this embodiment, the lower surfaces of the magnet bands 7p and 7q are S poles and N poles, respectively, but conversely, the lower surfaces of the magnet bands 7p and 7q are N poles and S poles, respectively.
It may be polar.

FIG. 4 shows an example of the average magnetic flux density distribution on the lower surface of the conveying section 4a of the intermediate conveyor 4 of the permanent magnet device 5.
The upstream magnetic assembly 7a has a large average magnetic flux density distribution on the right end portion of the drawing, that is, on the side of the feeding conveyor 2. Therefore, the DI can 1 on the feeding conveyor 2 is easily magnetically attracted to the intermediate conveyor 4, and is conveyed in the direction of arrow A with the annular protrusion 1a1 attracted to the lower surface of the intermediate conveyor 4 (see FIG. 6). At that time, the falling can 1x and the tilted can (not shown) are also sandwiched between a plurality of normal DI cans 1 and transferred from the infeed conveyor 2 to the intermediate conveyor 4 and conveyed (FIGS. 1 and 7). reference).

As shown in FIG. 4, the upstream magnet assembly 7a.
From the small gap portion 9 to a vicinity portion 7a1 having a width substantially equal to the body diameter D
The average magnetic flux density of is much smaller than the average magnetic flux density of the monopole magnet array 7b within a range in which the DI can 1 does not drop due to its own weight. In the case of the present embodiment, when the average magnetic flux density is about 150 gauss or less, the DI can 1 easily falls due to its own weight. The average magnetic flux density from the small gap portion 10 of the downstream magnet assembly 7c to the neighboring portion 7c1 having a width substantially equal to the body diameter D is equal to the monopole magnet array 7b.
Is almost equal to the average magnetic flux density (shown by the dotted line in FIG. 4) or slightly larger than that. The average magnetic flux density of the downstream magnet assembly 7c decreases toward 0 toward the left end of FIG. Therefore, when the DI can 1 reaches the downstream end of the downstream magnet assembly 7c, the DI can 1 is magnetically attracted by the permanent magnet 13 and drops onto the conveyor 12b of the delivery conveyor 12 and is conveyed in the direction of arrow A. To be done. The distribution of the average magnetic flux density as described above is realized by an appropriate combination of ferrite magnets, plastic magnets, rubber magnets and the like.

Since the average magnetic flux density distribution on the lower surface of the intermediate conveyor 4, that is, the average magnetic flux density distribution in the carrying direction acting on the bottom portion 1a of the DI can 1 is as described above,
As shown in FIG. 3, when the DI can 1 approaches the monopole magnet array 7b, it slides on the lower surface of the intermediate conveyor 4 and suddenly moves in the A direction.
That is, the magnet moves toward the single-pole magnet array 7b and moves forward, and tries to cross the small gap portion 10 while being attracted to the intermediate conveyor 4 as it is. Immediately thereafter, the lower surface of the intermediate conveyor 4 slides and is suddenly pushed back in the opposite direction, that is, in the B direction, and moves backward.

The reason is presumed as follows. As shown in FIG. 6, the bottom portion 1a of the DI can 1 has an annular protrusion 1a.
1 is formed, the annular projection 1a1 is adsorbed and held on the lower surface of the intermediate conveyor 4, and the DI can 1 is conveyed together with the intermediate conveyor 4 in the direction of arrow A. Upstream magnet assembly 7
On the lower surface of a, as shown in FIG. 2, adjacent N pole-S pole-
A plurality of magnetic force lines 15 are formed between the N pole and the S pole. Therefore, if the DI can 1 is not disturbed by another DI can 1, the DI can 1 has a maximum magnetic flux density of the magnetic field lines 15 at a position 15
a, that is, the bottom surface boundary line 20 of each of the magnet bands 7x and 7y and the bottom surface boundary line 21 of the adjacent case 6 (FIG. 2) are slid in the width direction of the lower surface of the conveyor 4 and approach. Since the annular projection 1a1 at the bottom of the DI can 1 has a linear circular shape, the coefficient of friction is extremely small, so that this sliding is performed smoothly. As a result, by the time the DI can 1 approaches the small gap portion 9, as shown in FIG.
(Or 21), and both ends of the body in the width direction are substantially along the bottom of the bottom boundary lines 21, 21 (or 20, 20) (whether the width w1 of the strip 7z is equal to the body diameter D). ,
It is a little smaller than that), so it is adsorbed on the intermediate conveyor 4, suspended and moved in the direction of arrow A.

The vicinity 7 of the small gap 9 of the upstream band 7z
The average magnetic flux density of z1 (corresponding to 7a1 in FIGS. 3 and 4) on the lower surface of the conveyor 4 is smaller than that of the monopolar magnet piece 7b1 (see FIG. 4). Therefore, the unipolar magnet piece 7b1 (the lower surface is the N pole) and the vicinity of the upstream side of the magnet strip 7y whose the lower surface is the S pole (7
The magnetic field lines 16 formed during z1) attract the DI can 1 to the lower surface of the conveyor 4 (FIGS. 2 and 5).
Much stronger. Therefore, the DI can 1 has a monopolar magnet piece 7b1.
And then rapidly slides on the lower surface of the intermediate conveyor 4, and as shown by symbol 1'in FIGS. 5 and 6, almost the first half reaches directly below the monopolar magnet piece 7b1 and further by symbol 1 ". Then, the intermediate belt 4 and the intermediate gap 4 cross the small gap portion 10 and approach the downstream side strip 7s. The larger the width of the small gap portion 9 is, the larger the sliding distance becomes. As the magnetic attraction force decreases, the normal DI can 1 easily falls, so that the width of the small gap portion 9 is about 5 to 15 m.
m is preferred, and more preferably about 8-10 mm.

The average magnetic flux density on the lower surface of the conveyor 4 in the vicinity 7s1 (corresponding to 7c1 in FIGS. 3 and 4) of the small gap portion 10 of the downstream side strip 7s is substantially equal to that of the monopolar magnet piece 7b1. It is slightly larger than that (see Fig. 4). Therefore, between the single pole magnet piece 7b1 (the lower surface is the N pole) and the magnet belts 7p, 7p whose lower surface is the S pole on the downstream side vicinity (7s1),
As shown in FIGS. 5 and 6, strong magnetic force lines 17 and 18 are formed. Since the magnetic flux lines 17 and 18 have the portions 17a and 18a having the maximum magnetic flux density at the center of the magnetic flux lines, the DI can 1 ″ slides on the lower surface of the intermediate conveyor 4 toward the maximum portions 17a and 18a. Then, as shown in FIG.
It suddenly returns in the direction of arrow B and moves backward. The retreat distance due to this slip varies depending on the width of the monopolar magnet piece 7b1 and the gap width of the small gap portion 10 and is within the above range (about 5 to 15 mm).
Therefore, the larger the width of the small gap portion 10, the larger the tendency. FIG.
In the case of the average magnetic flux density distribution shown in (1), when the width of the small gap portion 10 is about 10 mm, the receding distance is about 10 mm. If the width of the small gap portion 10 is increased, the above-mentioned return distance will be reduced unless the average magnetic flux density of the single pole magnet array 7b and the portion 7c1 near the small gap portion 10 of the downstream side magnet assembly 7c is increased accordingly. Does not grow.

A plurality of normal DI cans 1 sandwiching the collapsed cans 1x
Since the movement is restricted by the falling can 1x, the widthwise ends of the body do not necessarily move substantially along the lower portions of the bottom boundary lines 21, 21 (or 20, 20). However, both widthwise ends of the body are bottom boundary lines 21 and 21.
A can that is slightly deviated from (or 20, 20) also behaves in the vicinity of the monopole magnet array 7b in the same manner as a can that does not come off. Therefore, any DI can 1 that sandwiches the tilting can 1x makes a sharp forward and backward motion independently of each other when passing below the vicinity of the monopolar magnet array 7b as described above, It is shaken off between normal DI cans 1. Then, as shown in FIG. 1, it is rejected through the void portion 14 near the lower part of the monopole magnet array 7b.

The present invention is not limited to the above embodiments, for example, steel cans are drawn-redrawn cans,
It may be a seamless can such as a squeezed-re-squeezed-ironing can, or a welded can or a side seam can with an adhesive. The monopolar magnet may consist of a single permanent magnet. In this case, the side wall plate 6a of the case 6 is missing at the position where the monopolar magnet passes. The small gap portion does not necessarily have to be provided.

[0022]

The invention according to claim 1 is a can in which a plurality of steel cans, which are placed at random on an infeed conveyor at a slight interval from each other and are horizontally conveyed, are provided. The inclined can can be rejected during transportation. The invention according to claim 2 is
There is an advantage that the above reject can be performed more reliably. The invention according to claim 3 has an advantage that the device can be easily switched in a short time when the diameter D of the conveyed steel can changes.

[Brief description of drawings]

FIG. 1 is a front view for explaining a carrying device and an accessory device of the present invention.

FIG. 2 is a vertical sectional view taken along the line II-II in FIG.

FIG. 3 is a bottom view of an essential part for explaining a permanent magnet device in the transport device of FIG.

4 is a diagram showing an example of distribution of average magnetic flux density in the transport direction of the permanent magnet device of FIG.

5 is an enlarged view of an essential part of FIG. 3, illustrating the reason why a steel can rapidly slides in the front-rear direction along the lower surface of a conveyor in the vicinity of a monopolar magnet.

6 is a longitudinal sectional view for explanation taken along line VI-VI in FIG.

FIG. 7 is a bottom view of a main part as seen from the line VII-VII of FIG.

[Explanation of symbols]

 1 DI Can (Steel Can) 1'DI Can (Steel Can) 1 ”DI Can (Steel Can) 3 Magnetic Adsorption Transfer Device (Steel Can Transfer Device) 4 Intermediate Conveyor (Conveyor) 4a Transfer Part 5 Permanent Magnet Device 6 Case 7a Upstream magnet assembly 7b Single pole magnet (single pole magnet array) 7c Downstream magnet assembly 7z Upstream strip 7s Downstream strip 7p Magnet strip (S pole on the bottom) 7q Magnet strip (N pole on the bottom) 7x magnet band (N-pole on the lower surface) 7y magnet band (S-pole on the lower surface) 9 Small gap 10 Small gap

Claims (3)

[Claims] 1. A steel can carrying device comprising a conveyor for magnetically attracting and suspending a large number of steel cans for carrying in a horizontal direction, and a permanent magnet device fixed near and above the carrying section of the conveyor. The permanent magnet device includes an upstream magnet assembly, a single-pole magnet that extends at right angles to the transport direction and has a width that is approximately half the diameter of a steel can, and a downstream magnet assembly, in that order. In the magnet assembly and the downstream magnet assembly, a plurality of strip-shaped bodies each having a lower surface formed of a pair of N-pole magnet bands and S-pole magnet bands and extending in the transport direction are arranged in the width direction with the same magnetic pole order. The width of the strip is equal to or slightly smaller than the diameter of the steel can, and the average magnetic flux density on the lower surface of the conveyor in the vicinity of the monopole magnet of the upstream magnet assembly is smaller than that of the monopole magnet. Near the single pole magnet of the side magnet assembly The conveyor for steel cans, characterized in that the average magnetic flux density on the lower surface of the conveyor is almost equal to or slightly larger than that of the monopolar magnet. 2. The steel can according to claim 1, wherein a first small gap portion and a second small gap portion are provided between the upstream magnet assembly, the downstream magnet assembly and the monopolar magnet, respectively. Transport device. 3. The steel can carrying device according to claim 1, wherein each of the upstream side strip, the monopolar magnet and the downstream side strip is housed in a case made of a non-magnetic material.