JP7458213B2 - Sealing device - Google Patents

Description

The present invention relates to a seaming device equipped with a seaming roll that seams a lid onto a can.

BACKGROUND ART Conventionally, a seaming device equipped with a seaming roll for seaming a lid onto a can filled with a beverage or the like is known.
In order to rotate this seaming roll smoothly, a seaming roll pin is formed with a lubricant passage extending in the vertical direction inside, and a seaming part is formed on the side peripheral surface, and the seaming roll pin is connected to the seaming roll pin via a bearing. It has a side peripheral wall provided to be rotated, and a bottom wall that closes the bottom of the side peripheral wall and faces the opening of the lubricant passage of the seaming roll pin, and lubricates the bearing with lubricant supplied from the lubricant passage. What it does is known.
Bearing lubrication also serves to dissipate the generated heat, so it is necessary to make the lubricant flow sufficiently, so it is common to supply the lubricant under pressure to make it flow. If the pressure increases and the flow rate increases, there is a risk that the lubricant will leak from the seal.
Additionally, a lubricant supply mechanism that can secure the necessary external pressure and flow rate is required.
In the example shown in Patent Document 1, the bearing space of the seaming roll is kept in a pressurized state and a lubricant is sprayed, and the rotation action of the seaming roll is used as a pump to forcibly close the bearing space of the seaming roll. By discharging the lubricant from the bearing space to the outside of the seaming roll, a circulation path is formed that constantly circulates the lubricant in the bearing space. On the other hand, if the pressure of the lubricant increases and the flow rate increases, there is a possibility that the lubricant may leak from the seal portion. In the example shown in Patent Document 2, a seal ring and its lubrication device are proposed that can simultaneously prevent leakage of lubricant and deliver the lubricant to improve lubrication.

Therefore, in the example shown in Patent Document 3, the lubricant supply passage 23 (lubricant passage) in the seaming roll pin 12 communicates with the space 37 below the bearings 24 of the seaming rolls 8 and 9 provided in the seaming roll pin 12. The space 38 above the bearing 24 is connected to the lubricant supply passage 23 through a return passage 39, forming a closed circuit, and is sealed in the lubricant supply passage 23 (lubricant passage) in the seaming roll pins 12, 12. The lubricant flows outward to the bearing 24 due to centrifugal force, lubricates the bearing 24, returns to the oil supply passage 23 (lubricant passage) via the space 38 and return passage 39, and is sent to the space 37 again. It is configured to be circulated by centrifugal force in the same manner.
This makes it possible to omit an external lubricant supply mechanism and suppresses lubricant leakage.

Japanese Patent Application Publication No. 8-090118 Japanese Patent Application Publication No. 9-182927 Japanese Patent Application Publication No. 2003-170996

However, with this known seaming device, the lubricant flows only by centrifugal force, so it is not possible to obtain a sufficient flow rate, and it is difficult to obtain sufficient lubrication performance and heat removal performance at low speeds or under high loads. The problem was that I couldn't do it.

The present invention aims to solve the above problems by providing a tightening device that does not require the external supply of lubricant at high pressure, suppresses lubricant leakage, provides a sufficient flow rate, and provides sufficient lubrication and heat dissipation performance even when used at low speeds or with high loads.

The seaming device according to the present invention is a seaming device that has a seaming roll for seaming a lid onto a can, and the seaming roll includes a seaming roll pin having a lubricant passage formed therein that extends in the vertical direction. a side circumferential wall having a seaming portion formed on a side circumferential surface and provided to be rotated via a bearing with respect to the seaming roll pin; and a side circumferential wall that closes a bottom of the side circumferential wall and the lubricant passage of the seaming roll pin. The seaming roll has a bottom wall facing the opening of the seaming roll, and the seaming roll has a lubricant pump mechanism that transfers lubricant oil between the lubricant passage of the seaming roll pin and the bearing, thereby solving the above problem. It is.

According to the seaming device according to claim 1, the seaming roll has a lubricant pump mechanism inside the seaming roll that transfers the lubricant between the lubricant passage of the seaming roll pin and the bearing, so that high pressure is applied from the outside. This eliminates the need to supply lubricant, suppressing lubricant leakage, and providing a sufficient flow rate, making it possible to obtain sufficient lubrication and heat removal performance even at low speeds or under high loads.

According to the structure according to claim 2, the bottom wall has a threaded member extending upward and having a spiral cut formed on the circumferential surface, and the lubricant pump mechanism connects the lubricant passage and the By constructing the pump with a screw member, a so-called screw pump is constructed, and a flow rate can be ensured.
Furthermore, as the lubricant flows from the bearing toward the lubricant passage, it is also possible to apply negative pressure to the seal portion above the bearing, which is sucked by the screw pump, so that leakage of the lubricant can be more effectively prevented.
According to the structure according to claim 3, the bottom wall has a fin member formed radially on the upper surface, and the lubricant pump mechanism is configured with the fin member, so that a so-called centrifugal pump is formed. This makes it possible to reliably secure the flow rate.

According to the configuration described in claim 4, the seaming roll pin communicates with the space above the bearing and has a second lubricant passage independent of the lubricant passage, making it possible to supply lubricant from the outside and discharge lubricant to the outside, and by applying pressure from the outside and suctioning to the outside, it is possible to more reliably ensure the flow rate.
Furthermore, heat can be reliably removed, and deterioration of the lubricant and the inclusion of foreign matter can be reliably prevented.

FIG. 1 is a schematic diagram showing an example of the configuration of a seaming device according to an embodiment of the present invention. FIG. 1 is a cross-sectional view showing an example of a configuration of a seaming device according to an embodiment of the present invention. 1 is a sectional view showing an example of the configuration of a seaming roll of a seaming device according to an embodiment of the present invention. FIG. 3 is a cross-sectional view showing an example of the configuration of a seaming roll of a seaming device according to another embodiment of the present invention. FIG. 3 is a schematic diagram showing the flow of lubricant in the seaming device according to an embodiment of the present invention.

The present invention will be explained in detail below.
As shown in FIG. 1, a seaming device 100 according to an embodiment of the present invention includes a seaming turret 101 that performs a seaming process of a can C and a lid F, and a seaming turret 101 that holds a can C before seaming. A carry-in conveyor 102 that transports and supplies in a non-rotating state, a lid supply device 104 consisting of a lid separation unit 210 and a lid transport turret 250 that supply the lid F, and a discharge that transports the can CM after seaming from the seaming turret 101 It is provided with a turret 107 and a carry-out conveyor 108 which further carries out the can CM from the discharge turret 107 to the outside.
The seaming turret 101, the discharge turret 107, and the lid transport turret 250 are each provided with a pocket P on the outer periphery for individually storing and transporting cans C, cans CM, and lids F. An attachment 103 is provided that individually engages with and conveys C.
The rotational speeds of the seaming turret 101, discharge turret 107, and lid conveyance turret 250, the movement speed of the attachment 103 of the carry-in conveyor 102, and the interlocking timing of each pocket P and attachment 103 are determined between the can C and the can between each turret and the conveyor. It is designed to be adjustable so that the CM and lid F can be transferred smoothly.

As shown in FIG. 2, the seaming turret 101 that performs the process of seaming the cans C and lids F includes a can mounting unit 350 that places and rotates the can C in each pocket P, and a can mounting unit. A chuck 321 is provided opposite to the chuck 350 to position the lid F placed on the top of the can C, and a chuck 321 is vertically movably fitted into the chuck 321 to press the lid F placed on the top of the can C. It includes a chuck unit 320 having a knockout pad 322 that fits together with the can C, and a seaming unit 410 having first and second seaming rolls 451 and 452 for tightening the lid F around the can C.

The seaming turret 101 is rotatably arranged around the center shaft 109 with the central axis X extending in the vertical direction.
The lid separation unit 210, the lid transport turret 250, and the carry-in conveyor 102 are mechanically driven by a drive mechanism 151 of the seaming turret 101 via a transmission mechanism.

The chuck units 320 are rotatably arranged at equal angular intervals around the center shaft 109, facing the can placement units, with central axis X extending in the vertical direction, and an outer gear 323 of a rotating shaft supporting the chuck 321 at its lower end meshes with a sun gear 324 supported on the center shaft 109. The chuck unit 320 revolves with the rotation of the center shaft 109 and the center column, and the chuck 321 rotates on its own axis due to the meshing of the sun gear 324 with the outer gear 323.
The chuck 321 is fixedly disposed in the vertical direction but is rotatable. As shown to the right of the central axis X in Figure 2, the can mounting unit 350 is raised to clamp a can C with a lid F placed on it between the knock-out pad 322 and the can mounting unit 350, while engaging the outer peripheral surface of the lower end of the chuck 321, thereby centering the lid F.
The seaming unit 410 performs double seaming by means of seaming rolls 451 and 452 pivotally mounted so as to rotate on both ends of a seaming lever 450 whose center is fixed to the lower end of the revolving roll swing shaft 132 .
In the double seaming process, a primary seaming process is performed in which the curled portion of the lid F is wrapped around the flange portion of the can C by a seaming roll 451, and then a secondary seaming process is performed in which the curled portion is crimped and joined by tightening with a seaming roll 452 to maintain a tight seal.

As shown in FIG. 3, the seaming rolls 451 and 452 have a seaming roll pin 453 extending in the vertical direction, and a bearing 458 is attached to the lower end of the seaming roll pin 453 by a bearing clamp 459. Further, a rolling portion 470 is provided to be rotated via a bearing 458 with respect to the seaming roll pin 453.
The rolling part 470 has a concave-convex ring-shaped seaming part 471 formed on the side circumferential surface for tightening the can C and the lid F, and has a cylindrical side circumferential wall 472 with an open top and bottom, and an inner side of the side circumferential wall 472. It has a bottom wall 473 that is fluid-tightly attached to the lower end of the circumferential side and closes the bottom, and an upper wall 474 that closes the upper part of the side circumferential wall 472. The side peripheral wall 472 is provided to be rotated via a bearing 458 with respect to the seaming roll pin 453, and the bottom wall 473 is rotated together with the side peripheral wall 472.

Inside the seaming roll pin 453, a first lubricant passage 454 is formed extending in the vertical direction in the radial center, and a second lubricant passage 456 is formed extending in the vertical direction on the radial outer periphery side. At the upper end of the first lubricant passage 454, a horizontal passage 455 is formed which communicates with the lubricant passage (see FIG. 5) in the roll swing shaft 132, and at the upper end of the second lubricant passage 456, a horizontal passage 457 is formed which communicates with the lubricant passage (see FIG. 5) in the roll swing shaft 132. The lower end of the second lubricant passage 456 communicates with the upper part of the bearing 458, and the lower end of the bearing 458 opens into the space R between the lower end of the seaming roll pin 453 and the bottom wall 473, and the bottom wall 473 faces the opening of the lower end of the first lubricant passage 454 of the seaming roll pin 453 via a gap (space R), so that the space R communicates with the lower end of the first lubricant passage 454. A lubricant seal ring 475 seals between the upper end of the bearing 458 and the upper wall 474 .
The bottom wall 473 has a disk portion 476 that closes the bottom of the side peripheral wall 472, and a screw member 477 that has a spiral notch formed on its peripheral surface and extends upward from the top surface of the disk portion 476 in the center of the disk portion 476 and is inserted into the first lubricant passage 454 of the seaming roll pin 453 (in this embodiment, the lubricant passage of the bearing clamp 459 that is inserted into the first lubricant passage 454).
In this embodiment of the seaming device 100, a lubricant flow path is formed that connects the horizontal passage 457, the second lubricant passage 456, the bearing 458, the space R, the lubricant passage 454, and the horizontal passage 455, and a lubricant pump mechanism is configured in which lubricant oil is transported through the path by the screw pump effect caused by the rotation of the screw member 477 accompanying the rotation of the rolling portion 470.

When the can C is tightened, when the rolling part 470 is pressed against the lid F placed on the top of the can C by the roll swing shaft 132 via the seaming roll pin 453, the unevenness of the seaming part 471 of the side wall 472 is tightened. The annular shape contacts the flange portion of the lid F and the rolling portion 470 rotates as a result of which rolling or crimping is performed.
When tightening the can C, the lubricating oil supplied from the lubricant passage in the roll swing shaft 132 to the second lubricant passage 456 via the horizontal passage 457 is transferred to the second lubricant passage 456 by a lubricant pump mechanism. The discharge force flows into the bearing 458 due to the generated negative pressure and gravity, lubricates the bearing 458 while flowing down, reaches the space R, and is generated by the screw pump effect due to the rotation of the screw member 477 as the rolling part 470 rotates. The lubricant thus flows into the first lubricant passage 454 and returns to the in-machine housing via the return lubricant passage in the roll swing shaft 132 via the horizontal passage 455. The returned oil is again used to lubricate the upper part of the machine, and then flows into the seaming unit 410 by natural flow due to gravity, and is sent to the bearing 458 again.

As shown in FIG. 4, the seaming roll in the seaming device according to another embodiment has a shape that provides a centrifugal pump effect, including a fin member extending radially on the upper surface of the bottom wall. has the same configuration as the seaming roll in the seaming device 100 according to the first embodiment. In FIG. 4, parts having the same configuration as the seaming roll according to the first embodiment are given the same reference numerals.
The bottom wall 493 has a fin member 497 extending radially on the upper surface of a disk portion 496 that closes the bottom of the side peripheral wall 472 .
In the seaming device of this embodiment, the lubricant flows through the lubricant distribution path in the order of the horizontal passage 455, the first lubricant passage 454, the space R, the bearing 458, the second lubricant passage 456, and the horizontal passage 457. A lubricant pump mechanism is configured in which the lubricant is transported along the path by a centrifugal pump effect caused by centrifugal force generated by the rotation of the fin member 497.
When tightening the can C, the lubricant supplied from the lubricant passage in the roll swing shaft 132 to the first lubricant passage 454 via the horizontal passage 455 is transferred to the first lubricant passage 454 by a lubricant pump mechanism. It reaches the space R due to the generated negative pressure and gravity, and flows outward into the bearing 458 due to the discharge force generated by the rotation of the fin member 497, and after lubricating the bearing 458, the second lubricant passage 456 and the side The lubricant returns through the return lubricant passage in the roll swing shaft 132 through the passage 457 into the in-machine housing, and is sent to the bearing 458 again.
Note that the lubricant may be any fluid, such as oil, grease, or water-soluble lubricant.

The basic operation of the seaming device 100 configured as described above will be explained.
The cans C before the lids F are tightened are engaged with each attachment 103 of the carry-in conveyor 102 and conveyed, and headed for the seaming turret 101 rotated by the drive mechanism 151.
On the other hand, the lids F are cut out one by one from the lid separation unit 210 and delivered to each pocket P of the lid transport turret 250, and are directed to the seaming turret 101 by rotation of the lid transport turret 250 (see FIG. 1).
The speed and timing of the carry-in conveyor 102 and the lid transport turret 250 are adjusted according to the speed and timing of the seaming turret 101 so that the centers of the can C and the lid F coincide at the confluence G. The lid F is placed on the can C placed on the plate 360 by raising the can placement unit 350, whose rotation is controlled via appropriate gears, cam mechanisms, etc., at the confluence point G.
Thereafter, the can placement unit 350 further rises, the knockout pad 322 in the chuck 321 presses the lid F, and the chuck 321, whose rotation is controlled by the drive mechanism 151 via appropriate gears, cam mechanisms, etc., is placed on the lid F. After fitting and centering of the lid F, the can C with the lid F placed thereon is held between the plate 360, the chuck 321, and the knockout pad 322 with a constant axial load necessary for seaming. Then, the seaming turret 101 further rotates, and the plate 360 and the chuck 321 accelerate to the number of revolutions necessary for seaming before the lid F and can C that are clamped reach the seaming section E shown in FIG.
While passing through the seaming section E, the seaming lever 450 fixed to the lower end of the roll swing shaft 132 of the seaming unit 410 is swung, and the primary seaming lever 450, which is pivoted to rotate at both ends, is rotated. Double seaming is performed by sequentially pressing two seaming rolls 451 and 452 for the next seaming against the flanges of the can C and the lid F placed on the can C from the sides toward the chuck 321.
The can CM whose seaming has been completed is transferred from the seaming turret 101 to the discharge turret 107, and further transferred from the discharge turret 107 to the carry-out conveyor 108, where it is carried out to the next process such as inspection and packaging.

100... seaming device 101... seaming turret 102... carry-in conveyor 103... attachment 104... lid supply device 107... discharge turret 108... carry-out conveyor 109... center shaft 122 ... Vertical movement mechanism 123 ... Vertical movement cam 124 ... Vertical movement cam follower 132 ... Roll swing shaft 133 ... Vertical movement mechanism 134 ... Vertical movement cam 135 ... Vertical movement cam follower 151... Drive motor 156... Drive motor (servo motor)
158 ... Drive motor 210 ... Lid separation unit 215 ... Passage 320 ... Chuck unit 321 ... Chuck 322 ... Knockout pad 410 ... Seaming unit 450 ... Seaming lever 451・・・ Seaming roll (primary seaming)
452... Seaming roll (secondary seaming)
453 ... seaming roll pin 454 ... first lubricant passage 455 ... horizontal passage 456 ... second lubricant passage 457 ... horizontal passage 458 ... bearing 459 ... bearing clamp 470 ... Rolling part 471 ... Seaming part 472 ... Side peripheral wall 473 ... Bottom wall 474 ... Top wall 475 ... Lubricant seal ring 476 ... Disc part 477 ... Screw member 480 ... Seaming roll 493 ... Bottom wall 496 ... Disc part 497 ... Fin member C ... Can (before lid is tightened)
F: Lid CM: Can (after tightening the lid)
P: Pocket K: Spline E: Sealing section R: Space V: Chuck space X: Center axis

Claims (4)

A seaming device having a seaming roll for seaming a lid onto a can,
The seaming roll has a seaming roll pin in which a lubricant passage extending vertically is formed, a seaming portion is formed on a side peripheral surface, and is configured to rotate with respect to the seaming roll pin via a bearing. and a bottom wall that closes the bottom of the side peripheral wall and faces the opening of the lubricant passage of the seaming roll pin,
A seaming device characterized in that the seaming roll includes a lubricant pump mechanism inside the seaming roll that transfers lubricant between the lubricant passage of the seaming roll pin and the bearing. The bottom wall has a threaded member extending upward and having a spiral cut formed on the circumferential surface,
The seaming device according to claim 1, wherein the lubricant pump mechanism includes the lubricant passage and the screw member. The bottom wall has fin members formed radially on an upper surface thereof,
The seaming device according to claim 1 , wherein the lubricant pump mechanism is formed by the fin member. The seaming roll pin is characterized in that it has a second lubricant passage that communicates with the space above the bearing and is independent of the lubricant passage. The seaming device according to any one of claims 1 to 3.

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