JP2013147320A - Transfer conveyor device and method for transferring strip rubber member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transfer conveyor device and a method for transferring a strip rubber member capable of eliminating variations in unit weight in a length direction of the strip rubber member and improving a tire RFV by preventing large tensile force to be applied on the strip rubber member and suppressing shrinking generating in the strip rubber member after cutting in suppressing meandering and looseness generated in the strip rubber member.SOLUTION: A transfer conveyor device for a strip rubber member includes an upstream conveyor and a downstream conveyor with a predetermined interval for transferring the strip rubber member, and is configured to variably change speed of at least either of the conveyors. The transfer conveyor device for the strip rubber member includes: a non-contact type displacement gauge for detecting a position of a hanging part of the strip rubber member generating between the upstream conveyor and the downstream conveyor due to the speed difference of the upstream conveyor and the downstream conveyor, and outputting position information; and a speed control means for controlling the speed of the conveyors based on the position information.

Description

  The present invention relates to a belt-shaped rubber member transport conveyor device disposed on a rubber tire production line and a belt-shaped rubber member transport method using this device.

  2. Description of the Related Art Conventionally, in a rubber tire production line, various conveyor devices have been used to convey a belt-like rubber member such as a tread (for example, Patent Document 1).

  FIG. 4 is a view schematically showing a conventional belt-shaped rubber member conveying conveyor device installed in a tread extrusion line. As shown in FIG. 4, in this conveyor system, the first conveyor 1, the second conveyor 2, the third conveyor 3, the fourth conveyor 4, and the fifth conveyor 5 are provided with upper and lower folded portions from the upstream side. It is arranged and configured.

  And when the dancer roller 6 is arrange | positioned between each conveyor and the tread T extruded from the extruder A is conveyed sequentially toward the 5th conveyor 5 downstream from the 1st conveyor 1 upstream, Corresponding to the change in the position of the dancer roller 6, the conveyance speed of each conveyor is adjusted to prevent meandering or slack in the tread T.

Japanese Patent Laid-Open No. 2003-19760

  However, in such a conventional belt-shaped rubber member transport conveyor device, the dancer roller is brought into contact with the tread to change the position of the dancer roller for controlling the transport speed of each conveyor. When the weight of the dancer roller acts on the tread, the tread is pulled by the weight of the dancer roller in addition to the pull by the speed difference between the conveyors.

  In addition, depending on the maintenance situation of the dancer roller, the dancer roller may become heavier and may generate a larger tension.

  Thus, the tread transported in a state in which the tension is increased has a large shrinkage (shrinkage) after cutting, which may cause a variation in unit weight in the length direction of the tread. And the tire created using such a tread may worsen RFV.

  Therefore, the present invention, when suppressing the meandering and slack generated in the belt-like rubber member, suppresses a large tension applied to the belt-like rubber member, and suppresses the shrinkage generated in the belt-like rubber member after cutting. It is an object of the present invention to provide a conveyor device and a conveyor method for a belt-shaped rubber member that can improve the tire RFV by suppressing variation in unit weight in the length direction of the rubber member.

The invention described in claim 1
An upstream conveyor that conveys the belt-shaped rubber member, and a downstream conveyor that is disposed at a predetermined interval from the upstream conveyor, and a speed of at least one of the upstream conveyor and the downstream conveyor is provided. Is a belt-shaped rubber member conveyor device configured to be variable,
Non-contact type that outputs position information by detecting the position of the drooping portion of the belt-like rubber member generated between the upstream conveyor and the downstream conveyor due to the speed difference between the upstream conveyor and the downstream conveyor A displacement meter;
A belt-shaped rubber member conveying conveyor device comprising speed control means for controlling the speed of the conveyor based on position information of the hanging portion.

The invention described in claim 2
2. The belt-shaped rubber member conveying conveyor device according to claim 1, wherein the non-contact type displacement meter is an ultrasonic sensor.

The invention according to claim 3
2. The belt-like rubber member conveyor apparatus according to claim 1, wherein the non-contact type displacement meter is a laser displacement meter.

The invention according to claim 4
A method for transporting a belt-shaped rubber member using the belt-shaped rubber member transport conveyor device according to any one of claims 1 to 3,
The belt-like rubber member conveying method is characterized in that the speed of the conveyor is controlled based on the position information of the hanging portion.

  According to the present invention, when suppressing meandering and slack generated in the band-shaped rubber member, it is possible to suppress a large amount of tension on the band-shaped rubber member and to suppress shrinkage generated in the band-shaped rubber member after cutting. It is possible to provide a belt-shaped rubber member conveying conveyor device and a conveying method that can improve the tire RFV by eliminating variations in unit weight in the length direction of the rubber member.

It is a figure which shows typically the conveyance conveyor apparatus of the strip | belt-shaped rubber member of embodiment of this invention. It is a figure which shows the measurement location of the tread of an Example and a comparative example. It is a figure which shows the weight distribution of the tread of an Example and a comparative example. It is a figure which shows typically the conveyance conveyor apparatus of the conventional strip | belt-shaped rubber member.

  FIG. 1 is a diagram schematically showing a conveyor belt device for a belt-like rubber member according to the present embodiment. In the present embodiment, a tread is adopted as the belt-like rubber member.

  As shown in FIG. 1, the conveyance conveyor apparatus of this Embodiment is arrange | positioned in the middle of the conveyance path of the conveyance means B of the same structure as the conventional conveyance conveyor apparatus except except the dancer roller, and a conveyance means. A non-contact displacement meter, and speed control means for controlling the speed of the conveyor.

  As shown in FIG. 1, the conveying means B is provided with a first conveyor 1, a second conveyor 2, a third conveyor 3, a fourth conveyor 4 and a fifth conveyor 5 from the upstream side. Gap Q1-Q4 is provided between each conveyor used as a part.

  The tread T extruded from the extrusion molding machine A is sequentially conveyed from the first conveyor 1 upstream to the fifth conveyor 5 downstream by the conveying means B. In the intermediate gaps Q1 to Q4, the tread T The drooping portions T1 to T4 are formed with a predetermined size so that a tension larger than necessary is not applied.

  In the vicinity of the gaps Q1 to Q4, an ultrasonic sensor S1 and a laser displacement meter S2 are arranged as non-contact type displacement meters, and these displacement meters are sag of the tread T in each sag portion, that is, sag. The position of the part is detected.

  The reason why two types of non-contact displacement meters are used, namely, the ultrasonic sensor S1 and the laser displacement meter S2, is as follows. That is, when there are no objects other than the object in the surroundings and there is no risk of erroneous detection, or when the position of the object is easy to change and pinpoint detection is difficult, specifically, in Q1 and Q4 shown in FIG. An ultrasonic sensor is preferred for detection. On the other hand, if there is something other than the object around and there is a risk of false detection, or if the position of the object is difficult to change and pinpoint detection is possible, specifically, in Q2 and Q3 shown in FIG. A laser displacement meter is preferred for detection.

  When the difference in the conveyance speed of each conveyor increases, the position of the drooping portion of the tread T changes, so this displacement is detected by the displacement meter, and based on the position information, the speed control means determines the conveyance speed of each conveyor. By controlling, the position of the drooping portion of the tread T is set within a predetermined range.

  As described above, in the present embodiment, the non-contact displacement meter is installed in the hanging portion without causing the weight of the dancer roller to act on the tread as in the case of a conventional belt-shaped rubber member conveyor device using a dancer roller. Since it is arranged in the vicinity and the conveyor speed is controlled so that the difference in the conveyor speed between the conveyors stays within a predetermined range, shrinkage generated in the band-shaped rubber member after cutting can be suppressed. And as a result, since the dispersion | variation in the unit weight of the length direction of a strip | belt-shaped rubber member can be suppressed, there is no possibility of causing deterioration of tire RFV.

1. Examples and Comparative Examples In the following examples, the tread is transported using the above-described transport conveyor apparatus of the present embodiment, that is, the transport conveyor apparatus provided with a non-contact displacement meter, while the comparative example. In, the tread was conveyed using the conventional conveyance conveyor apparatus, ie, the conveyance conveyor apparatus provided with the dancer roller.

2. Test contents A tread extruded from an extrusion molding machine with a width of 280 mm and a thickness of 9.0 mm was transported using the transport conveyor apparatus of Examples and Comparative Examples.

(1) Shrinkage length of tread After conveyance, the tread was cut at a length of 2400 mm, and the shrinkage length after 3 hours was measured. From the measurement results, the shrinkage length (Ave: 10 pieces) in Examples and Comparative Examples Average of measurement data), range (R: difference between maximum value and minimum value in 10 pieces of measurement data), standard deviation (σ: standard deviation obtained from 10 pieces of measurement data) were obtained. The results are shown in Table 1.

  According to Table 1, when the transport conveyor device provided with the non-contact type displacement meter is used (Example), the contraction is smaller than when the transport conveyor device provided with the dancer roller is used (Comparative Example). It can be seen that the length is much smaller and R and σ are also smaller. From this result, it can be seen that the shrinkage length after cutting can be managed with high accuracy by using the transport conveyor device provided with the non-contact type displacement meter.

(2) Weight of tread After the tread was conveyed in the same manner as described above, the tread was cut to the length shown in FIG. 2 to produce 12 treads having a length of 200 mm. One of them was formed from joint portions (100 mm) at both ends as shown in FIG. The weight of each tread was measured, and the weight distribution, R, and σ in Examples and Comparative Examples were determined from the measurement results. The measurement results of the weight distribution are shown in FIG. 3, and R and σ are shown in Table 2.

  As shown in FIG. 3, when the transport conveyor device provided with the non-contact type displacement gauge is used (Example), it is more positive than when the transport conveyor device provided with the dancer roller is used (Comparative Example). It has a shape close to a dodecagon, and it can be seen that the weight is controlled with high accuracy. This is also clear from the results in Table 2, and when a transport conveyor device provided with a non-contact displacement meter is used (Example), a transport conveyor device provided with dancer rollers is used. Compared to (Comparative Example), R and σ are also small.

  From this result, it can be seen that the use of a conveyor device provided with a non-contact type displacement meter can manage the variation in the weight of the tread with small accuracy.

(3) Tire RFV
Using each tread, a tire having a tire size of 285 / 60R18 was produced, and RFV was measured. The results are shown in Table 3.

  From Table 3, when the conveyance conveyor apparatus provided with the non-contact-type displacement meter was used (Example), compared with the case where the conveyance conveyor apparatus provided with the dancer roller was used (comparative example), RFV It can be seen that RFV is greatly improved by using a conveyor device provided with a non-contact displacement meter.

  From the above test results, by using the conveyor device provided with the non-contact displacement meter according to the present embodiment, it is possible to reduce the shrinkage after cutting and reduce the variation in weight. It can be seen that the tire RFV can be greatly improved by using such a tread.

  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 1st conveyor 2 2nd conveyor 3 3rd conveyor 4 4th conveyor 5 5th conveyor 6 Dancer roller A Extruder B Transport means Q1-Q4 Gap between conveyors S1 Ultrasonic sensor S2 Laser displacement meter T Tread T1-T4 Tread sag

Claims (4)

An upstream conveyor that conveys the belt-shaped rubber member, and a downstream conveyor that is disposed at a predetermined interval from the upstream conveyor, and a speed of at least one of the upstream conveyor and the downstream conveyor is provided. Is a belt-shaped rubber member conveyor device configured to be variable,
Non-contact type that outputs position information by detecting the position of the drooping portion of the belt-like rubber member generated between the upstream conveyor and the downstream conveyor due to the speed difference between the upstream conveyor and the downstream conveyor A displacement meter;
A belt-shaped rubber member transport conveyor device, comprising: a speed control unit configured to control a speed of the conveyor based on position information of the hanging portion.   2. The belt-like rubber member conveying conveyor device according to claim 1, wherein the non-contact type displacement meter is an ultrasonic sensor.   The belt-like rubber member conveying conveyor device according to claim 1, wherein the non-contact type displacement meter is a laser displacement meter. A method for transporting a belt-shaped rubber member using the belt-shaped rubber member transport conveyor device according to any one of claims 1 to 3,
A method for conveying a belt-like rubber member, wherein the speed of the conveyor is controlled based on position information of the hanging portion.

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