JP5249596B2 - Rubber strip conveyor - Google Patents

Description

  The present invention relates to a rubber strip conveyance device that conveys a rubber strip continuously supplied from a strip supply device to a delivery position for intermittently feeding the rubber strip.

  For example, in Patent Documents 1 and 2, an unvulcanized rubber strip continuously extruded from a rubber extruder using a non-extensible endless conveying tape guided so as to be capable of circular motion by a plurality of guide rollers, A rubber strip conveying device that conveys to a forming drum while holding an adhesive on one surface of an endless conveying tape is disclosed.

  In the molding drum, a rubber product having a desired finished cross-sectional shape is molded by a so-called strip winding method in which a rubber strip to be conveyed is spirally wound. In this molding process, the product is molded by moving the molding drum. The movable state and the resting state in which the molding drum pauses for product removal are configured as one cycle. Therefore, a rubber strip continuously supplied from a rubber extruder is temporarily provided in the conveying device. Accumulator means for storing is provided, and adjustment of the speed difference and timing difference between the rubber strip supply speed from the rubber extruder that operates continuously and the feed speed to the molding drum that operates intermittently is performed.

As shown schematically in FIG. 6, the accumulator means a includes a fixed roller group c composed of a plurality of upper guide rollers c1 rotatably attached to a horizontal fixed frame b, and a lower portion of the horizontal fixed frame. The upper and lower guide rollers c1 and e1 that are vertically opposed to each other are provided with a lift roller group e composed of a plurality of lower guide rollers e1 rotatably attached to a horizontal lift frame d that is supported so as to be movable up and down. The endless transport tape f is wound in a zigzag shape while alternately folding back. Therefore, for example, when the forming drum is in a resting state (when the delivery speed va is lower than the supply speed vb), the elevating frame d is lowered to store the rubber strip, and conversely, the forming drum is in an operating state. (When the delivery speed va becomes higher than the supply speed vb), the stored rubber strip is consumed and the elevating frame d is raised .

  On the other hand, the strip winding method has an advantage that a rubber product having a free shape and size can be easily formed. However, the cycle time differs depending on the shape and size of the rubber product. Therefore, in the rubber strip conveying device, it is necessary to secure a storage amount with a sufficient margin, and for this purpose, the width of the accumulator means a is set large.

Japanese Patent No. 3322648 JP 2002-137278 A

  Here, in the case of the accumulator means a having the above structure, the folded portion of the rubber strip can be a resistance. Therefore, for example, when the rubber strip is formed of a rubber material having a low modulus, the resistance is small, so that the lifting frame d can be moved up and down substantially horizontally.

  However, when the rubber strip is formed of a high modulus rubber material, the resistance at the folded-back portion is large, so that the endless transport tape f is formed between the inlet side Pi and the outlet side Po of the accumulator means a. The difference in applied force increases. That is, as conceptually shown in FIG. 7, the force Fo pulled up at the outlet side Po is not sufficiently transmitted to the inlet side Pi by the resistance R, and the pulling force Fi at the inlet side Pi is very small. It becomes. As a result, there is a problem in that the elevating frame d is greatly inclined, and this inclination becomes a mechanical resistance to cause the elevating frame d to be locked, and the accumulator means a does not function.

  Therefore, the present invention is based on the fact that the accumulator means is divided into a plurality of accumulator parts, and an adjustment means for detecting the height difference between the lifting frames of adjacent accumulator parts and adjusting the height difference is provided. An object of the present invention is to provide a rubber strip conveying device that can suppress tilting of the elevating frame even when the rubber strip is formed of a high modulus rubber material and can stably operate the accumulator means.

In order to achieve the above-mentioned object, the invention of claim 1 of the present application comprises a non-extensible endless transport tape guided by a plurality of guide rollers so as to be capable of rotating, and is continuously fed from a strip feeding device and receiving position. A rubber strip conveying device that conveys the rubber strip made of unvulcanized rubber to the delivery position for intermittently delivering the rubber strip while adhering and holding the rubber strip on one surface of the endless conveyance tape,
Accumulator means for temporarily storing a rubber strip continuously received at the receiving position between the receiving position and the sending position;
And the accumulator means is divided into a plurality of accumulator parts arranged in a line along the transport direction,
In addition, each accumulator unit is rotatable to a fixed roller group composed of a plurality of upper guide rollers that are rotatably attached to a horizontal fixed frame, and a horizontal lift frame that is supported so as to be movable up and down below the horizontal fixed frame. The endless transport tape is wound in a zigzag shape while alternately folding back and forth between the upper guide roller and the lower guide roller facing each other in the vertical direction. As well as
The horizontal elevating frame is lowered when storing the rubber strip, and is raised when discharging the rubber strip, and the raising and lowering are performed without power.
The accumulator means includes a driving roller driven by a motor that winds the endless transport tape between the accumulator sections adjacent to each other in the transport direction, a lifting frame next to one adjacent accumulator section, and the other accumulator section. And a lifting frame height adjusting means for adjusting the height difference by controlling the drive of the motor by a detection signal from the detection tool. Provided,
The motor of the elevator frame height adjusting means, Ri Do because only one,
The lifting frame height adjusting means transports the drive roller when the upstream lifting frame is positioned below the downstream lifting frame and the height difference exceeds a lower threshold. When the upstream elevating frame is pulled up by driving in the direction, the upstream elevating frame is positioned above the downstream elevating frame, and the height difference exceeds the upper threshold The driving roller is stopped driving .

  In the invention of claim 2, the accumulator means is characterized in that the width of each accumulator portion is 2000 mm or less.

  As described above, according to the present invention, the accumulator means is divided into a plurality of accumulator sections, so that each accumulator section can be greatly reduced. Therefore, in each accumulator part, the difference of the pulling-up force between the exit side and the entrance side can be reduced, the inclination of the lifting frame can be suppressed, and the occurrence of locking can be suppressed. Here, if the accumulator means is only divided into a plurality of accumulator parts, the pulling-up force decreases as the accumulator part is located upstream due to the influence of the resistance of the folded part. As a result, the height of each elevating frame decreases stepwise as it goes upstream, and there is a problem that the storage capacity (storage capacity) as an accumulator is reduced.

  However, in the present invention, the accumulator means is provided with adjusting means for detecting a height difference between the lifting frames in the adjacent accumulator portions and adjusting the height difference. The adjusting means includes a driving roller that winds an endless conveying tape between adjacent accumulator units, and the operation of the driving roller compensates for the loss due to the resistance of the folded portion, and the endless conveying of the adjacent accumulator unit on the upstream side. A pulling force can be applied to the tape. That is, the drive roller can pull up the lifting frames of the accumulator units adjacent on the upstream side, and can manage the lifting frames of the accumulator units at substantially the same height. Reduction can be suppressed.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a side view showing a rubber strip conveying device of the present invention.

  As shown in FIG. 1, a rubber strip conveying device 1 (hereinafter referred to as a conveying device 1) of the present embodiment is a rubber made of unvulcanized rubber that is continuously supplied from a strip supply device 2 and received at a receiving position Q1. The strip G is conveyed to a delivery position Q2 where the rubber strip G is intermittently delivered. In this example, the rubber strip conveying device 1 is incorporated in a raw tire molding line, and a rubber strip G continuously extruded from the strip supply device 2 which is a rubber extruder is installed at the delivery position Q2 and intermittently. By transporting to the molding drum 5 to be operated and winding the rubber strip G spirally on the molding drum 5, a tire component having a desired finished cross-sectional shape is formed.

  Further, the transport device 1 includes a non-extendable endless transport tape 7 guided by a plurality of guide rollers 6 so as to be capable of circular motion, and the rubber strip G is adhered and held on one surface thereof to thereby hold the rubber strip G. It can be conveyed from the receiving position Q1 to the sending position Q2.

  For the “holding”, the rubber adhesiveness of the unvulcanized rubber is used. Accordingly, as the endless transport tape 7, a non-stretchable reinforcing core made of organic fiber is preferably coated with a surface layer of a polyester resin excellent in adhesiveness to unvulcanized rubber. Is done.

  Further, the conveying device 1 includes an outward accumulator means 8 for temporarily storing a rubber strip G continuously received at the receiving position Q1 between the receiving position Q1 and the sending position Q2, and a rubber strip G. And a return accumulator means 9 for temporarily storing only the endless transport tape 7 after being fed out.

  An endless conveyance tape 7 stored in the accumulator means 9 for returning is disposed at the upstream side of the accumulator means 8 for the outward path substantially at the same speed as the supply speed of the rubber strip G from the strip supply device 2. The driving roller 10 for continuous operation is provided. Further, on the downstream side of the forward path accumulator means 8, an endless transport tape 7 with a rubber strip stored in the forward path accumulator means 8 is synchronized with the molding drum 5 and at a speed corresponding to the molding drum 5. A driving roller 11 for intermittent operation is provided.

  In the present invention, the outward accumulator means 8 is divided into a plurality of accumulator sections 13 arranged in a line along the transport direction. In this example, the case where it is divided into a first accumulator portion 13A on the upstream side in the transport direction and a second accumulator portion 13B on the downstream side is illustrated.

  As shown in FIG. 2, each accumulator unit 13 </ b> A, 13 </ b> B includes a fixed roller group 21 including a plurality of upper guide rollers 6 </ b> U that are rotatably attached to the horizontal fixed frame 20, and a lower side of the horizontal fixed frame 20. There is a lifting roller group 23 composed of a plurality of lower guide rollers 6L that are rotatably attached to a horizontal lifting frame 22 that is supported so as to be movable up and down.

  The horizontal fixing frames 20, 20 are fixed and supported at the same height and horizontally by a frame 24 having a rectangular frame shape, for example. In this example, each fixed frame 20 is illustrated as being formed as one side portion / the other side portion of one frame member that is horizontally continuous. On the other hand, the horizontal elevating frames 22 and 22 are supported so as to be movable up and down independently of each other via guide guides 25, respectively. The guide guide 25 is composed of left and right guide shafts extending in the vertical direction in this example, and the lateral lifting frames 22 are moved up and down independently of each other by being guided by the guide guides 25 at both ends. sell. The horizontal fixed frame 20 has upper guide rollers 6U arranged in a row, and the horizontal elevating frame 22 has a lower guide roller at an intermediate position between the upper guide rollers 6U and 6U. 6L is arranged.

  The endless transport tape 7 is wound in a zigzag shape while alternately turning back and forth between the upper guide roller 6U and the lower guide roller 6L facing vertically. At this time, as shown in FIG. 3, the endless transport tape 7 is wound between the upper and lower guide rollers 6U, 6L with a twist J obtained by twisting its one surface S1 and the other surface S2 by 180 °. As a result, the endless transport tape 7 can be brought into contact with the guide rollers 6U and 6L only on the other surface S2 that does not hold the rubber strip G, and stable rotation and deformation of the rubber strip G can be prevented.

  The forward path accumulator means 8 is provided with a lifting frame height adjusting means 26. The elevating frame height adjusting means 26 includes a driving roller 27 for winding the endless conveying tape 7 between the accumulator portions 13A and 13B adjacent in the conveying direction, and an elevating frame 22 beside the adjacent one accumulator portion 13A. And a detection tool 28 for detecting a height difference H from the horizontal lifting frame 22 of the other accumulator portion 13B. The height difference H means the height difference H between the adjacent end portions of the horizontal lifting frames 22 and 22.

  The sensor 28 is not particularly restricted and various sensors can be used. In this example, an encoder is attached to each elevating frame 22 and the vertical movement amount of each elevating frame 22 from the reference height position is measured to detect the height difference H as a difference in the moving amount. Yes.

  The drive roller 27 is connected to an output shaft of a motor M fixed to the frame 24 and the like, and ON / OFF of the drive roller 27 is controlled by a detection signal from the detector 28. The drive roller 27 can pull up the lifting frame 22 of the accumulator portion 13A adjacent on the upstream side by driving in the transport direction. Therefore, when the driving roller 27 is driven by the detection signal of the height difference H by the detector 28, the elevating frames 22 of the accumulator units 13 can be adjusted to substantially the same height.

  In this way, in the present invention, the accumulator means 8 is divided into a plurality of accumulator sections 13 and the width W of each accumulator section 13 is greatly reduced, so that each accumulator section 13 has a gap between its outlet side and inlet side. The difference in the pulling-up force can be reduced, the inclination of the lifting frame 22 can be suppressed, and the occurrence of locking can be suppressed. For that purpose, it is preferable that the width W of the accumulator portion 13 defined by the length of the lifting frame 22 is 2000 mm or less, and if it exceeds 2000 mm, the resistance of the folded portion of the rubber strip G is increased and decreased. There is a risk that the lock of the frame 22 cannot be suppressed.

  Here, simply dividing into a plurality of accumulator sections 13 causes each elevating frame 22 to be lowered stepwise as it goes upstream, and there is a problem that storage capacity (storage capacity) as an accumulator is reduced. However, in the present invention, the elevating frame height adjusting means 26 is provided in the accumulator means 8. Therefore, each elevating frame 22 can be managed at substantially the same height, and a decrease in storage capacity (storage capacity) as an accumulator can be suppressed. As described above, the upstream lifting frame 22 tends to be lower. Accordingly, in the height adjustment, the side where the height of the upstream lifting frame 22 is lower than the downstream lifting frame 22 is positive (+), and the difference H is detected. The difference H is a lower threshold value Hmax1. When (+) is exceeded, the driving roller 27 is driven in the conveying direction, and the upstream lifting frame 22 is pulled up. When the upstream lifting frame 22 exceeds the upper threshold value Hmax2 (−) above the downstream lifting frame 22 (−side), the driving of the driving roller 27 is stopped. Thereby, the adjacent raising / lowering frames 22 can be managed in the range of Hmax1 to Hmax2.

  Next, in the accumulator means 9 for the return path, since the rubber strip G is not adhesively held on the endless transport tape 7, the problem as in the accumulator means 8 for the forward path does not occur. Therefore, this return accumulator means 9 is formed as one accumulator part without being divided. In other words, the accumulator means 9 for the return path is movable up and down below the fixed roller group 31 including a plurality of upper guide rollers 6U that are rotatably attached to one horizontal fixed frame 30 and below the horizontal fixed frame 30. Only the endless conveying tape 7 after the rubber strip G is fed out is configured to include a lifting roller group 33 composed of a plurality of lower guide rollers 6L that are rotatably attached to one horizontal lifting frame 32 that is supported. Are temporarily stored.

  As mentioned above, although especially preferable embodiment of this invention was explained in full detail, this invention is not limited to embodiment of illustration, It can deform | transform and implement in a various aspect.

  Using the rubber strip conveyance device of the embodiment having the structure shown in FIG. 1, a conveyance test for conveying a plurality of types of rubber strips G having different rubber compositions from the receiving position Q1 to the sending position Q2 is performed. The presence or absence of a failure was compared with a conventional rubber strip conveyor.

  FIG. 4 shows a graph in which the resistance value at the folded portion in each of the rubber strips G1 to G17 is taken as the vertical axis. In the rubber strip conveyance device of the example, it was possible to stably convey all the rubber strips G1 to G17 having a resistance value of 86 kPa or less without causing a failure. On the other hand, in the conventional rubber strip conveyance device, the raising / lowering frame is locked with respect to the rubber strips G13 to G17 having a resistance value of 60 kPa, and the accumulator means for the outward path does not move.

  Here, the rubber strip conveying device of the above embodiment and the conventional rubber strip conveying device are different only in the accumulator means for the outward path, and in the embodiment, the accumulator means for the outward path is divided into two accumulators having a width W of 2000 mm. The elevating frame height adjusting means is provided between the accumulator parts. On the other hand, in the conventional example, the accumulator means for the outward path is formed by one wide accumulator portion having a width W of 4000 mm without being divided.

Further, the rubber strip G to be transported has a thickness of 2.2 mm and a width of 20 mm, and the method of measuring the resistance value K at the folded portion of the rubber strip G is as follows.
<Resistance value at folded part of rubber strip>
As shown in FIG. 5, a rubber strip sample 42 having a thickness of 2.2 mm, a width of 20 mm, and a length of 290 mm is formed on a transport tape sample 41 having a length of about 300 mm with weights weighing 1.8 kgf attached to both ends. A test sample 43 with an adhesive held was made as a prototype. The test sample 43 is left in an oven at 60 ° C. for 10 minutes. Thereafter, the center of the test sample 43 is hung on a guide roller 44 having a diameter (30 mm), and the weight 40 is suspended so that the test sample 43 has the same temperature as the room temperature (the temperature of the measurement chamber). Leave for a minute.

  Thereafter, with the weight 40 suspended, the one end side of the test sample 43 is slowly pulled downward to measure the peak value of the pulling force generated when the distance of 15 mm is lowered, and this peak value is measured with the rubber. A value divided by the cross-sectional area of the strip sample 42 is defined as a resistance value K (unit: kPa).

It is a side view which shows the rubber strip conveying apparatus of this invention. It is a side view which expands and shows the accumulator means. It is a perspective view explaining the twist in an endless conveyance tape. It is the graph which made the resistance value in the folding | turning part in the rubber strip used for the conveyance test a vertical axis | shaft. It is a side view explaining the test method of the resistance value in the folding | turning part of a rubber strip. It is a side view which shows the conventional accumulator means. It is a conceptual diagram which shows the problem in the conventional accumulator means.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rubber strip conveyance apparatus 2 Strip supply apparatus 6 Guide roller 6U Upper guide roller 6L Lower guide roller 7 Endless conveyance tape 8 Accumulator means 13, 13A, 13B Accumulator part 20 Horizontal fixed frame 21 Fixed roller group 22 Horizontal lifting frame 23 Lifting roller group 26 Lifting frame height adjusting means 27 Driving roller 28 Detector G Rubber strip Q1 Receiving position Q2 Sending position S1

Claims (2)

A non-extensible endless transport tape guided by a plurality of guide rollers so as to be capable of circular motion, and the endless transport of a rubber strip made of unvulcanized rubber continuously supplied from a strip supply device and received at a receiving position. A rubber strip transport device for transporting the rubber strip to a delivery position for intermittent delivery while adhering and holding on one side of the tape,
Accumulator means for temporarily storing a rubber strip continuously received at the receiving position between the receiving position and the sending position;
And the accumulator means is divided into a plurality of accumulator parts arranged in a line along the transport direction,
In addition, each accumulator unit is rotatable to a fixed roller group composed of a plurality of upper guide rollers that are rotatably attached to a horizontal fixed frame, and a horizontal lift frame that is supported so as to be movable up and down below the horizontal fixed frame. The endless transport tape is wound in a zigzag shape while alternately folding back and forth between the upper guide roller and the lower guide roller facing each other in the vertical direction. As well as
The horizontal elevating frame is lowered when storing the rubber strip, and is raised when discharging the rubber strip, and the raising and lowering are performed without power.
The accumulator means includes a driving roller driven by a motor that winds the endless transport tape between the accumulator sections adjacent to each other in the transport direction, a lifting frame next to one adjacent accumulator section, and the other accumulator section. And a lifting frame height adjusting means for adjusting the height difference by controlling the drive of the motor by a detection signal from the detection tool. Provided,
The motor of the elevator frame height adjusting means, Ri Do because only one,
The lifting frame height adjusting means transports the drive roller when the upstream lifting frame is positioned below the downstream lifting frame and the height difference exceeds a lower threshold. When the upstream elevating frame is pulled up by driving in the direction, the upstream elevating frame is positioned above the downstream elevating frame, and the height difference exceeds the upper threshold The rubber strip transport device stops driving the drive roller .   2. The rubber strip conveying device according to claim 1, wherein the accumulator means has a width of each accumulator portion of 2000 mm or less.

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