JP2015128854A - Contact detection device of calender roll, and rubber calender device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a contact detection device of calender rolls, capable of detecting occurrence of metal contact of the calender rolls, in order to properly prevent damage of the calender rolls.SOLUTION: A contact detection device of calender rolls, provided in a rubber calender device including a plurality of calender rolls having a surface speed difference, and a roll housing for supporting the calender rolls, and molding a rubber sheet by rolling a rubber composition supplied to between the plurality of calender rolls includes: measurement means for measuring through the roll housing a force to a tangential direction of the calender roll, generated in a contact part when the calender rolls directly contact each other; and determination means for determining that the calender rolls are in metal to metal contact with each other when a force measured by the measurement means is equal to or more than a previously set value.

Description

  The present invention relates to a calendar roll contact detection device, and more particularly to a calendar roll contact detection device that detects the occurrence of metal contact between calendar rolls and a rubber calendar device provided with the calendar roll contact detection device.

  The rubber sheet used for the manufacturing process of a pneumatic tire is shape | molded by rolling a rubber composition with the rubber calender apparatus which has a some calender roll.

  Specifically, the rubber composition is interleaved between a plurality of calender rolls (hereinafter also simply referred to as “rolls”) that are rotated in opposite directions by being given a surface speed difference (roll surface speed difference) by a speed tuning gear. By forming a rubber bank and rolling, a rubber sheet having a certain thickness is formed (for example, Patent Document 1).

  At this time, first, after biting the rubber composition between the rotating rolls, until the set value (mechanical gap) of the gap between the rolls in the absence of the rubber composition becomes a negative region (0 mm or less), Reduce the roll interval. Thereby, a rolling reaction force is generated in the rubber composition bitten between the rotating rolls, the entire roll is bent in the roll diameter direction, and a gap is generated between the rolls. When the rubber composition of the rubber bank passes through the generated gap, the rubber composition is rolled to form a thin rubber sheet.

Japanese Patent Laid-Open No. 7-80872

  However, in the above rubber calendar device, the rubber composition may not be formed between the rolls due to the progress of rolling molding, or the rubber bank may fail to be formed due to some factor during rolling molding, so that the rubber composition is formed in the gap. When there is no more, the deflection of the entire roll in the diameter direction of the roll disappears, and the rotating rolls come into direct metal contact with each other, and the roll surfaces are scraped off little by little to damage the roll surfaces.

  As a result, the profile provided on the roll surface is damaged, and an expensive roll must be replaced without waiting for the profile to wear over time, resulting in an increase in equipment cost.

  Therefore, there has been a demand for a technique that can appropriately detect the metal contact between the rotating rolls. However, conventionally, there has been no effective means for appropriately detecting the metal contact.

  Therefore, the present invention provides a calendar roll contact detection device and the calendar roll contact detection device capable of appropriately preventing damage to the calendar roll by appropriately detecting the occurrence of metal contact between the calendar rolls. It is an object of the present invention to provide a rubber calendar device.

The invention described in claim 1
A plurality of calender rolls having a surface speed difference and a roll housing that supports the calender rolls, and provided in a rubber calender device that forms a rubber sheet by rolling a rubber composition supplied between the calender rolls. Being
When the calender rolls are in direct contact with each other, a measuring means for measuring the force in the tangential direction of the calender roll generated in the contact portion through the roll housing;
A calender roll comprising: a judging unit that determines that the calender rolls are in metal contact with each other when the force measured by the measuring unit is equal to or greater than a preset value. It is a contact detection device.

The invention described in claim 2
The rubber calendar device is provided with a calendar frame that supports the roll housing,
The measuring means is
A force transmission rod inserted into a frame through-hole formed in the calendar frame and having one end abutting against the roll housing;
With a load cell attached to the calendar frame and abutting against the other end of the force transmission rod,
The force in the tangential direction of the calendar roll generated at the contact portion between the calendar rolls is measured by the load cell via the roll housing and the force transmission rod. 1. A contact detection device for a calendar roll according to 1.

The invention according to claim 3
A rubber calendar device comprising the calendar roll contact detection device according to claim 1 or 2.

  According to the present invention, there is provided a contact detection device for a calendar roll and a contact detection device for the calendar roll which can appropriately prevent damage to the calendar roll by appropriately detecting the occurrence of metal contact between the calendar rolls. Rubber calendar devices can be provided.

It is a figure which shows typically the rubber calendar apparatus provided with the contact detection apparatus of the calendar roll which concerns on one embodiment of this invention.

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

  FIG. 1 is a view schematically showing a rubber calendar device provided with a contact detection device for a calendar roll according to the present embodiment. As shown in FIG. 1, the rubber calendar device includes a pair of upper and lower calendar rolls 2 and 3. The upper calendar roll 2 is a driving roll to which driving means is attached, and the lower calendar roll 3 is an interlocking roll interlocking with the upper calendar roll 2. The surface velocity difference is caused.

  The upper calendar roll 2 is supported by an upper roll housing 5, and the lower calendar roll 3 is supported by a lower roll housing 6. The roll housings 5 and 6 are supported by the calendar frame 1.

  In addition, a roll interval opening / closing shaft 12 is attached to the lower portion of the lower roll housing 6, and the lower calendar roll 3 is moved up and down by raising and lowering the support 12 a screwed to the roll interval opening / closing shaft 12. Thus, the distance from the upper calendar roll 2 can be adjusted.

  The calendar roll contact detection device according to the present embodiment is arranged in the tangential direction of the calendar rolls 2 and 3 generated at the contact portions of the calendar rolls 2 and 3 via the roll housings 5 and 6 that support the calendar rolls 2 and 3. When the force measured by the measuring means 13 and the measuring means 13 exceeds a preset value (threshold value), the calendar rolls 2 and 3 are in direct metal contact with each other. Determination means (not shown) for determination.

  The measuring means 13 has a force transmission rod 8 and a load cell 9. The force transmission rod 8 is inserted into a frame through hole 7 provided in the calender frame 1 of the rubber calender device and is substantially perpendicular to the ascending / descending direction of the lower roll housing 6 so that one end abuts the lower roll housing 6. Is arranged. The other end of the force transmission rod 8 is arranged so as to protrude from the calendar frame 1 and abut against the load cell 9.

  The load cell 9 is attached to the calendar frame 1 of the rubber calendar device by a base plate 10 and a base mounting bolt 11.

  The force (friction force) in the tangential direction of the calender rolls 2 and 3 generated at the contact portion due to the contact between the calender rolls 2 and 3 is transmitted to the lower roll housing 6 and then via the force transmission rod 8 to the load cell 9. Is transmitted to.

  The determination means is connected to the load cell 9 and is configured to receive the value of the friction force measured by the load cell 9. In this determination means, the magnitude of the friction force generated when the calendar rolls 2 and 3 are in direct metal contact with each other is stored in advance as a threshold, and the magnitude of the friction force received from the load cell 9 is compared. When the value is larger than the value stored as the threshold, it is determined that the calendar rolls 2 and 3 are in metal contact with each other.

  As a result, the metal contact generated between the rotating rolls can be detected quickly and reliably.

  Then, based on the determination that the calendar rolls 2 and 3 are in metal contact with each other, the control unit of the rubber calendar device stops the rotation of the calendar rolls 2 and 3. Thereby, it is possible to prevent the roll surfaces of the calender rolls 2 and 3 that are in direct metal contact with each other from being cut and damaged.

  As a result, an expensive roll can be sufficiently used until the aging of the profile.

  Molding of the rubber sheet using the above rubber calendar device is performed in the same manner as before. That is, as described above, after the rubber is first bitten between the rotating rolls, the calendar roll 3 is raised by raising the support 12a screwed to the roll gap opening / closing shaft 12, and the roll gap is raised. Narrow enough. Thereby, a rolling reaction force is generated in the rubber composition caught in the rotating calendar rolls 2 and 3, the calendar rolls 2 and 3 are bent in the roll diameter direction, and a gap is formed between the rolls. The rubber composition is rolled by passing the composition.

  However, if the rubber composition is not formed between the rolls due to the progress of rolling forming, or the rubber composition is lost in the gap between the rolls due to some reason during the rolling forming, The bending of the roll diameter direction of 2 and 3 disappears, and the rotating calendar rolls 2 and 3 come into contact with each other.

  When the calendar rolls 2 and 3 come into contact with each other, a force (friction force) in the tangential direction of the calendar rolls 2 and 3 is generated at the contact portion due to the difference in surface speed between the calendar rolls 2 and 3.

  The generated friction force is transmitted to the lower roll housing 6 via the axis of the calendar roll 3, and then transmitted to the load cell 9 via the force transmission rod 8 and measured.

  The measured friction force value is transmitted from the load cell 9 to the determination means. The determination means compares the received friction force value with a threshold value stored in advance, and when the friction force value is equal to or greater than the threshold value, the calendar rolls 2 and 3 are in direct metal contact with each other. Determine and send the information to the control unit.

  The control unit stops the rotation of the calendar rolls 2 and 3 based on the received information. This makes it possible to stop the rotation of the calendar rolls 2 and 3 immediately after the rubber bank 4 is lost during the rolling and the calendar rolls 2 and 3 are in metal contact with each other, and the calendar rolls 2 and 3 are damaged. Can be prevented appropriately.

  As a result, the profiles of the calendar rolls 2 and 3 can be maintained up to the roll life, the frequency of roll replacement can be reduced, and the equipment cost can be greatly reduced.

  Further, since the profile of the surface of the calendar rolls 2 and 3 can be maintained, a rubber sheet having a uniform thickness can be easily created over a long period of time, which can contribute to saving of rubber material costs. .

  In the above-described embodiment, when the determination unit determines that the calendar rolls 2 and 3 are in metal contact with each other, the rotation of the calendar rolls 2 and 3 is stopped. It is not limited. For example, when the calendar rolls 2 and 3 are in metal contact, the calendar rolls 2 and 3 can be prevented from being damaged also by lowering the lower calendar roll 3 to increase the interval between the rolls.

  Further, as described above, it is not necessary to perform lowering of the roll or stop of rotation by automatic control, and it is necessary to check the notification that the calendar rolls 2 and 3 are in direct metal contact and manually roll the roll. May be lowered or stopped.

  While the present invention has been described based on the embodiments, the present invention is not limited to the above embodiments. Various modifications can be made to the above-described embodiments within the same and equivalent scope as the present invention.

DESCRIPTION OF SYMBOLS 1 Calendar frame 2 Upper calendar roll 3 Lower calendar roll 4 Rubber bank 5 Upper roll housing 6 Lower roll housing 7 Frame through-hole 8 Force transmission rod 9 Load cell 10 Base plate 11 Base mounting bolt 12 Roll interval opening / closing shaft 12a Support body 13 Measurement means

Claims (3)

A plurality of calender rolls having a surface speed difference and a roll housing that supports the calender rolls, and provided in a rubber calender device that forms a rubber sheet by rolling a rubber composition supplied between the calender rolls. Being
When the calender rolls are in direct contact with each other, a measuring means for measuring the force in the tangential direction of the calender roll generated in the contact portion through the roll housing;
A calender roll comprising: a judging unit that determines that the calender rolls are in metal contact with each other when the force measured by the measuring unit is equal to or greater than a preset value. Contact detection device. The rubber calendar device is provided with a calendar frame that supports the roll housing,
The measuring means is
A force transmission rod inserted into a frame through-hole formed in the calendar frame and having one end abutting against the roll housing;
With a load cell attached to the calendar frame and abutting against the other end of the force transmission rod,
The force in the tangential direction of the calendar roll generated at the contact portion between the calendar rolls is measured by the load cell via the roll housing and the force transmission rod. The contact detection apparatus of the calendar roll of 1.   A rubber calendar device comprising the calendar roll contact detection device according to claim 1.

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