JP6075531B2 - Pin conveyor can support - Google Patents

Description

  The present invention relates to a pin conveyor can body supporter having support pins that are attached to a chain conveyor and hook and support a can body that is open at one end.

  The manufacturing process of cans such as beverage cans includes various processing steps such as printing on the outer peripheral surface of the can, drying, and coating of the inner surface of the can. In such a manufacturing process, a can body is conveyed to each processing process by a pin chain conveyor (for example, refer patent document 1). For example, as shown in FIG. 4, this type of pin chain conveyor is engaged with a chain conveyor 100 that meshes with a sprocket 120 (actually there can be a plurality) and moves along a predetermined track by the rotation of the sprocket 120. A plurality of support pins 10 extending in a direction crossing the moving direction A of the chain conveyor 100 (a direction perpendicular to the paper surface) are provided at predetermined intervals. The chain conveyor 100 moving at the same speed as the peripheral speed of the turret 130 along the outer peripheral portion of the rotating turret 130 is constrained to the outer peripheral portion of the turret 130 with a predetermined interval. Each of the plurality of cans Wc is released from the restraint and moved to the support pin 10. And the can body Wc hooked on the support pin 10 is conveyed with the movement of the chain conveyor 100.

  For example, the support pins 10 are provided on the chain conveyor 100 as shown in FIG.

  In FIG. 5, a support member 14 extending in a direction crossing the moving direction A (a direction parallel to the paper surface) is fixed to the chain conveyor 100, and a wing 13 is supported and fixed at the tip of the support member 14. The support pin 10 is provided so as to protrude from the center of the wing 13 in a direction crossing the moving direction A of the chain conveyor 100, similarly to the support member 14. The support pin 10 is disposed on the support shaft 15, one end of which is fixed to the wing 13, the pin tip 11 rotatably mounted on the support shaft 15, and the tip end side of the pin tip 11, and is rotatable on the support shaft 15. And a cap 12 attached thereto.

  In the pin conveyor can supporter having the support pins 10 provided on the chain conveyor 100 in this way, the inner surface of the can body Wc (1) that is hooked on the support pins 10 with one end opened is the base of the pin chip 11. Supported by the end and the cap 12.

JP 2008-44746 A

  By the way, in the pin chain conveyor described above, for example, when the can body Wc moves from the turret 130 to the support pin 10 (see positions P1, P2, and P3 shown in FIG. 4), the movement trajectory of the can body Wc changes abruptly. For this reason, the can body Wc in a state of being hooked on the support pin 10 can be greatly shaken. Specifically, for example, as shown in FIG. 5, the can body Wc (1) normally hooked on the support pin 10 is inclined such that the distal end portion and the proximal end portion thereof swing in the opposite directions in the radial direction. (Wc (2)). When the can body Wc hooked on the support pin 10 swings greatly in the radial direction in this way, the inner surface of the swaying can body Wc collides with the tip corner of the cap 12 constituting the support pin 10, and the can body Wc. There is a risk that a convex can defect may occur in which the colliding portion of the inner surface of the slab is recessed and protrudes outwardly. The above-described problem is particularly remarkable in a can body such as a steel can having a large weight and high rigidity.

  By reducing the conveyance speed of the can body Wc by the pin chain conveyor, it is possible to reduce the occurrence rate of the convex can defect. However, reducing the conveyance speed means a decrease in production efficiency and is not preferable.

  The present invention has been made in view of such circumstances, and a pin conveyor can body having a structure capable of reducing the occurrence rate of convex can defects without sacrificing the conveyance speed of the can body in the pin chain conveyor. A support is provided.

The pin conveyor can supporter according to the present invention includes a pin chip provided on a chain conveyor that moves along a predetermined track so as to extend in a direction crossing the moving direction, and is coaxial with the pin chip on the tip side of the pin chip. A pin conveyor can body support device having a support pin comprising a cap provided, wherein the contactable region from the maximum outer diameter position of the cap outer surface to the position where the maximum inclined can inner surface can contact is in the axial direction The length is larger than the radial component length, and the axial shape of the contactable region is an arc-shaped convex shape having a constant radius of curvature.

  The constant radius of curvature can preferably be determined within a range of 20 mm to 50 mm, and more preferably within a range of 30 mm to 35 mm.

Further, the axial shape of the cap outer surface is an arc convex shape with the constant curvature radius from the maximum outer diameter position to the tip of the cap, and the contactable region extends from the maximum outer diameter position on the cap outer surface to the cap. It can be set as the structure which is an area | region to the position before this from the front-end | tip.

  Further, the axial shape of the cap outer surface from the base end portion on the pin tip side to the tip end is an arc convex shape having the constant radius of curvature, and a maximum outer diameter is provided between the base end portion and the tip end. be able to.

  According to the pin conveyor can supporter according to the present invention, the outer surface of the cap has a diameter that is gradually reduced in the radial direction over a relatively long range in the axial direction, and has no portion that protrudes discontinuously in the axial direction. Since the possible region is formed, the inner surface of the can body is supported in the contactable region even if the can body is greatly shaken in the radial direction without reducing the conveyance speed of the can body in the pin chain conveyor. Can do. As a result, it is possible to reduce the incidence of convex can defects without sacrificing the conveyance speed of the can body.

It is a figure which shows the structure of the pin conveyor can support body which concerns on one Embodiment of this invention. It is a figure which expands and shows the cap part of the support pin in the pin conveyor can body supporter shown in FIG. It is a figure which shows the relationship between the shape of the contactable area | region in the cap of a support pin, and the shape of the can which is hooked and supported by the support pin. It is a figure which shows an example of a pin chain conveyor. It is a figure which shows an example of the structure of the conventional pin conveyor can body supporter.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  The pin conveyor can support according to the embodiment of the present invention is configured as shown in FIG. This pin conveyor can body supporter is provided on a chain conveyor 100 in a pin chain conveyor as shown in FIG.

  In FIG. 1, like the conventional one (see FIG. 5), it protrudes from the center of the wing 13 fixed to the chain conveyor 100 via the support member 14 in a direction crossing the moving direction A of the chain conveyor 100. The support shaft 15 is fixed. Similar to the conventional one (see FIG. 5), the pin tip 11 and the cap 20 are rotatably mounted on the tip of the support shaft 15, and the support pin 10 is supported by the pin tip 11, the support shaft 15, and the cap 20. It is configured. In a normal state, the can body Wc (1) having one end that is hooked and supported by the support pin 10 is supported by two points, that is, the base end portion of the pin tip 11 and the maximum outer diameter position of the cap 20.

  Referring to FIG. 2 together with FIG. 1, the axial shape of the outer surface 20a between the base end portion Pe and the distal end portion Ps of the cap 20 is an arc-shaped convex curve having a constant curvature radius R, and the outer surface 20a is supported. The rotation surface is a curved line having a circular arc shape centered on the shaft 15. The cap 20 has a maximum outer diameter (position Pmax) between the proximal end Pe and the distal end Ps. The inner surface of the can body Wc (1) hooked on the support pin 10 having the cap 20 having such a shape is normally supported at the maximum outer diameter position Pmax of the outer surface 20a of the cap 20.

  A region (thick line portion) from the maximum outer diameter position Pmax of the outer surface 20a of the cap 20 to a position Pc (position before the tip portion Ps of the cap 20) that supports the inner surface of the can body Wc (2) having the maximum inclination, It becomes the contact possible area | region Ec which the inner surface of the can body Wc can contact. Accordingly, the tip of the cap 20 is gradually reduced in the radial direction over a relatively long range in the axial direction and from the maximum outer diameter position Pmax of the outer surface 20a of the cap 20 without a portion protruding discontinuously in the axial direction. Within the portion Ps, the inner surface of the can body can be supported by the region from the maximum outer diameter position Pmax to the position Pc that supports the inner surface of the can body Wc (2) having the maximum inclination.

  As shown in FIG. 2, the contactable region Ec has an axial length Lax larger than the radial length Lr, and the contactable region Ec has a shape in the axial direction of the outer surface 20 a of the cap 20. Similar to the shape, it has an arc convex shape with a constant curvature radius R.

  According to the pin conveyor can body supporter including the support pin 10 having the cap 20 having such a shape, the axial length Lax of the contactable region Ec of the cap 20 with which the inner surface of the can body Wc can contact is set. Since the axial direction shape of the contactable region Ec is larger than the length Lr of the radial component and has a constant curvature radius R, the radial direction is gentle over a relatively long range (Lax) in the axial direction. The inner surface of the can body Wc that can be variously swayed in the radial direction is supported by the contactable region Ec of the outer surface 20a of the cap 20 that does not have a portion that protrudes discontinuously in the axial direction. Will come to be. For this reason, even if the can body Wc hooked and supported by the support pin 10 is greatly shaken in the radial direction without reducing the conveyance speed of the can body Wc in the pin chain conveyor, it is at the tip portion of the support pin 10. The inner surface of the can body Wc can be supported by the contactable region Ec of the cap 20. As a result, it is possible to reduce the incidence of convex can defects without sacrificing the conveyance speed of the can body Wc.

  The constant radius of curvature R will be specifically considered.

In FIG.
h: Height of the can body Wc hooked to the support pin 10 (mm)
D: Can diameter of can body Wc (mm)
S: Maximum outer diameter of the cap 20 (mm)
d: outer diameter of support shaft 15 (mm)
θ: Maximum tilt angle (degrees)
Δθ: Margin angle (degrees)
Is defined.
The relationship between the can body Wc and the maximum inclination angle θ is
tanθ = D / h (1)
Assume that
However, expecting a margin angle Δθ = 0.3θ as a safety factor,
θ ′ = θ + Δθ = 1.3θ
And
The relationship between the maximum inclination angle θ and the constant curvature radius R is as follows.
R · cos θ ′ = RS−2 + d / 2 (2)
Here, if the maximum outer diameter S of the cap 20 is too large, when the support pin 10 is inserted into the can body Wc, there is a possibility that it contacts the opening end.
S ≦ D / 3 (3)
From (2) and (3), the maximum value Rmax of the radius of curvature R is
Rmax ≦ (D-3d) / 6 · (1-cosθ ′) (4)
It becomes.
Assuming a 200 ml can with D = 52 mm and h = 104 mm as the can body Wc,
Maximum inclination angle θ = 26.6 degrees Maximum outer diameter S of cap 20 = 17 mm
Then, the optimum value provided by substituting the maximum S in Equation (3) is
Maximum value of curvature radius R Rmax = 32.2mm
It becomes.
As a result of repeating various tests on the assumption that the can body Wc has a capacity smaller than or larger than 200 ml, the curvature radius R of the outer surface 20a of the cap 20 may make the convex can defective rate relatively small. From the viewpoint of being able to do so, it was found that the preferable range for sandwiching the numerical value is preferably within the range of 20 mm to 50 mm, and further, within the range of 30 mm to 35 mm is more preferable from the viewpoint of stability when transporting the can body Wc. .

  Further, the axial shape from the base end portion Pe on the pin tip 11 side of the outer surface 20a of the cap 20 to the tip end portion Ps becomes an arc convex shape with a constant curvature radius, and the maximum diameter is between the base end portion Pe and the tip end portion Ps. The position Pmax can be configured. As a result, the base end portion Pe of the cap 20 out of the outer surface 20a of the cap 20 is gradually reduced in the radial direction over a relatively long range in the axial direction and does not have a portion projecting discontinuously in the axial direction. The inner surface of the can body can be supported by a region from the maximum diameter position Pmax between the tip portion Ps and the position Pc in front of the tip portion Ps of the cap 20.

  In the cap 20, if the shape in the axial direction of the contactable region Ec of the outer surface 20a is an arc convex shape having a constant curvature radius R, for example, between the maximum diameter position Pmax and the base end Pe. As for the region and the region between the position Pc where the can body Wc having the maximum inclination is supported and the tip end portion Ps, any one can be used as long as the inner surface of the can body Wc supported by the contactable region Ec is not in contact with it. Such a shape may be used.

  As described above, the pin conveyor can supporter according to the present invention has the effect of reducing the incidence of defective convex cans without sacrificing the transfer speed of the cans in the pin chain conveyor. It is useful as a pin conveyor can supporter having a support pin that is attached to a chain conveyor and has a support pin that hooks and supports a can that is open at one end.

DESCRIPTION OF SYMBOLS 10 Support pin 11 Pin tip 12, 20 Cap 20a Outer surface 13 Wing 14 Support member 15 Support shaft 100 Chain conveyor 120 Sprocket 130 Turret

Claims (5)

A pin having a pin tip provided on a chain conveyor moving along a predetermined track so as to extend in a direction crossing the moving direction, and a support pin comprising a cap provided coaxially with the pin tip on the tip side of the pin tip A conveyor can support,
The contactable region from the maximum outer diameter position of the cap outer surface to the position where the maximum inclined can inner surface can come into contact is longer in the axial direction than the radial component length, and the axial shape of the contactable region is A pin conveyor can supporter having an arc convex shape with a constant radius of curvature.   The pin conveyor can support according to claim 1, wherein the constant radius of curvature is in a range of 20 mm to 50 mm.   The pin conveyor can support according to claim 2, wherein the constant radius of curvature is within a range of 30 mm to 35 mm. The axial shape of the outer surface of the cap is an arc convex shape of the constant curvature radius from the maximum outer diameter position to the tip of the cap,
The pin conveyor can support according to any one of claims 1 to 3, wherein the contactable region is a region from the maximum outer diameter position on the outer surface of the cap to a position before the tip of the cap.   The axial shape from the base end part on the pin tip side of the cap outer surface to the tip end is an arc convex shape with the constant curvature radius, and there is a maximum outer diameter between the base end part and the tip end. Pin conveyor can body supporter.

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