JP5064068B2 - Preheating method and apparatus for unvulcanized rubber hose. - Google Patents

Description

  The present invention relates to an unvulcanized rubber hose preheating method and apparatus for preheating an unvulcanized rubber hose containing a magnetic metal body by electromagnetic heat generated in the magnetic metal body by energization of an electromagnetic induction coil prior to vulcanization. .

Conventionally, when continuously vulcanizing a rubber hose reinforced with a long wire, after extruding the outer surface of the rubber hose with an extruder or the like, a temporary outer mold is formed on the outer periphery with resin, lead, etc. A general method is to introduce into a vulcanizing apparatus such as hot air, and to securely vulcanize the rubber hose efficiently and in a captured state by securely holding the outer periphery side with an outer mold. After vulcanization, the outer mold was torn and removed. However, in order to continuously vulcanize a long rubber material such as a rubber hose, a vulcanizing apparatus containing a vulcanizing drum for winding an unvulcanized rubber hose has become enormous. Therefore, in order to prevent the vulcanizing apparatus from becoming huge, an electromagnetic wave generated in the magnetic metal body by energizing the electromagnetic induction coil with an unvulcanized rubber hose including a magnetic metal body as a reinforcing body prior to vulcanization. A method of manufacturing a rubber hose has been proposed in which the vulcanization time in the vulcanizer is shortened by preheating with heat, and thus the vulcanizer can be downsized (see, for example, Patent Document 1 below).
Japanese Patent Laid-Open No. 2002-103340 (refer to Claim 1).

  The rubber hose manufacturing method disclosed in Patent Document 1 will be described with reference to FIG. Prior to the vulcanization step in the continuous vulcanizer 122, the unreinforced rubber rubber hose 110 is continuously supplied to the high-frequency induction heating device 184 disposed in front of the vulcanization zone, and the wire reinforcing layer is supplied. 116 is induction-heated, and the unvulcanized long rubber hose 110 is heated from the inside to increase the temperature and preheated. Thus, by preheating the unvulcanized long rubber hose 110 from the inside using the high-frequency induction heating device 184, it can be easily heated in an extremely short time, and the vulcanization process time in the continuous vulcanizer 122 Therefore, the continuous vulcanizer 122 can be downsized.

  However, in the preheating using the high frequency induction heating device 184, there is no problem when the unvulcanized long rubber hose 110 is supplied at a constant speed, but if any trouble is encountered, the line is decelerated or It must be stopped and the line must be restarted after recovery. During such deceleration or acceleration, the long rubber hose 110 passing through the high-frequency induction heating device 184 is continuously given energy by a predetermined electric power. Therefore, the energy applied per unit length of the long rubber hose 110 at the time of deceleration becomes excessively higher than the steady supply speed and considerably increases from the rated temperature.

  Therefore, the wire reinforcing layer 116 that is induction-heated exceeds 180 ° C. where the unvulcanized characteristics are maintained, and is about 300 ° C., and the adhesive applied to the wire surface causes baking and adhesion to rubber. Is remarkably lowered and peeling easily occurs. As a result, the pressure resistance performance of the hose is lowered, and bursts and the like are likely to occur. In order to solve such a problem, a method of applying a defective mark to the hose when the line speed is changed and removing the defective mark portion after vulcanization has been adopted. However, in addition to the troublesome work to apply the defective mark, there is a concern that the defective product rate is reduced by removing the defective mark portion and the yield is also deteriorated.

  Therefore, the present invention solves the problem of such a conventional method for manufacturing a rubber hose, and uniformly preheats by electromagnetic induction regardless of the supply (feed) speed of the unvulcanized rubber hose, so that the rubber hose prior to the vulcanization process It is an object of the present invention to provide a preheating method and apparatus for an unvulcanized rubber hose that can ensure a stable quality of a vulcanized product by making the temperature rise of the vulcanized product uniform.

Therefore, the present invention relates to a preheating method for an unvulcanized rubber hose in which an unvulcanized rubber hose containing a magnetic metal body is preheated by electromagnetic heat generated in the magnetic metal body by energization of an electromagnetic induction coil prior to vulcanization. The power of the electromagnetic induction coil is controlled by pulse control according to the feed speed of the unvulcanized rubber hose detected by the speed detecting means. In addition, the present invention provides a preheating device upstream of the vulcanizing device, an electromagnetic induction coil disposed around the unvulcanized rubber hose in the preheating device, and a feed rate of the unvulcanized rubber hose. A speed detection means for detecting, a detection value processing means for processing a detection value of the speed detection means, and a power control means for controlling the electromagnetic induction coil by pulse control by a processing signal from the detection value processing means are installed. It is characterized by that. The present invention, before Symbol speed detecting means characterized in that it is a rotary encoder. In the invention, it is preferable that the speed detecting means is a laser detector. Further, the present invention is characterized in that the speed detecting means is installed in the vicinity of the electromagnetic induction coil. Further, the invention is characterized in that the speed detecting means is installed in the vicinity of the winding drum. Further, the present invention is characterized in that the speed detecting means is installed in the vicinity of the guide roller, and these are means for solving the problems.

According to the present invention, in the preheating method of the unvulcanized rubber hose, the unvulcanized rubber hose containing the magnetic metal body is preheated by electromagnetic heat generated in the magnetic metal body by energization of the electromagnetic induction coil prior to vulcanization. By controlling the power of the electromagnetic induction coil by pulse control according to the feed speed of the unvulcanized rubber hose detected by the speed detection means, the power of the electromagnetic induction coil is adjusted with the increase / decrease of the feed speed of the unvulcanized rubber hose. Therefore, the unvulcanized rubber hose containing the magnetic metal body is not excessively preheated, the temperature is increased uniformly and moderately, and the vulcanization time in the vulcanization process is effectively shortened. In addition to contributing to downsizing of the vulcanizer, stable quality of the vulcanized product can be secured. Moreover, based on the value detected by the speed detection means for detecting the feed speed of the unvulcanized rubber hose, the preheating temperature is appropriately controlled by pulse control in which the energizing time of the electromagnetic induction coil is digitally selected with appropriate pulse width and interval. Is easily obtained.

In addition, a preheating device is disposed upstream of the vulcanizing device, an electromagnetic induction coil disposed around the unvulcanized rubber hose in the preheating device, and a speed for detecting a feed rate of the unvulcanized rubber hose. By providing a detection means, a detection value processing means for processing the detection value of the speed detection means, and a power control means for controlling the electromagnetic induction coil by pulse control by a processing signal from the detection value processing means The electromagnetic induction coil can be appropriately heated and controlled by the power control means based on the value detected by the speed detection means for detecting the feed speed of the unvulcanized rubber hose, and the unvulcanized rubber hose is uniformly reserved by generating appropriate electromagnetic heat. Since it can be heated, the vulcanization time in the vulcanization process can be effectively shortened, contributing to downsizing of the vulcanizer and ensuring stable quality of the vulcanized product. Moreover, based on the value detected by the speed detection means for detecting the feed speed of the unvulcanized rubber hose, the preheating temperature is appropriately controlled by pulse control in which the energizing time of the electromagnetic induction coil is digitally selected with appropriate pulse width and interval. Is easily obtained.

Further, if pre-Symbol speed detecting means is a rotary encoder, when the power control means of the pulse control mode, easily detected pulse signal is obtained.

  Further, when the speed detection means is a laser detector, in order to grasp the feed amount per unit time that is the feed speed of the unvulcanized rubber hose, if it is a laser detector, the reference part of the unvulcanized rubber hose Can be easily identified without using a special device. Furthermore, when the speed detecting means is installed in the vicinity of the electromagnetic induction coil, the speed detecting means can be integrated with the electromagnetic induction coil as a preheating device.

  Furthermore, when the speed detection means is installed in the vicinity of the take-up drum, it is necessary to convert it to a peripheral speed at which the take-up diameter is changed every time the take-up drum is wound. Can be diverted as means for detecting the feed rate of the rubber hose. In addition, when the speed detection means is installed in the vicinity of the guide roller, the rotation speed detection means of the guide roller can be diverted as the feed speed detection means of the rubber hose.

Embodiments of a preheating method and apparatus for an unvulcanized rubber hose of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic diagram of the principle of the preheating method for an unvulcanized rubber hose of the present invention, FIG. 2 is an overall schematic diagram of a rubber hose manufacturing process including a vulcanization process, and FIG. 3 is a preheating of the unvulcanized rubber hose of the present invention. FIG. 4 is an explanatory view showing a detection signal from the speed detection means and a power control signal by the power control means. As shown in FIG. 1, the basic configuration of the unvulcanized rubber hose preheating method and apparatus of the present invention is such that an unvulcanized rubber hose 1 including a magnetic metal body 2 is energized by an electromagnetic induction coil 5 prior to vulcanization. In the preheating method of the unvulcanized rubber hose 1 preheated by the electromagnetic heat generated in the magnetic metal body 2 in the electromagnetic induction coil according to the feed speed of the unvulcanized rubber hose 1 detected by the speed detecting means 4 5 is controlled by pulse control .

  FIG. 1 is a schematic view of the principle of the preheating device of the present invention, and FIG. 2 is an overall schematic view of a rubber hose manufacturing process including a vulcanization process. As shown in FIG. 2, the preheating device 10 that realizes the preheating method of the present invention is disposed upstream of the vulcanizing device 13 between the feeding drum 8 and the winding drum 9. The unvulcanized rubber hose 1 fed from the feeding drum 8 is guided by the guide roller 12 </ b> A and supplied to the preheating device 10. In the preheating device 10, an unvulcanized rubber hose 1 including the magnetic metal body 2 is preheated by a power-controlled electromagnetic induction coil 5 which will be described later, and is turned by a guide roller 12 </ b> B and a guide roller 12 </ b> C in the vulcanizing device 13. Then, it is vulcanized in the vulcanizing device 13 while being wound around the vulcanizing drum 11. The vulcanized rubber hose 1 is guided by a guide roller 12D and wound around a winding drum 9 to become a product.

  Next, the preheating device of the present invention will be described with reference to FIG. As shown in FIG. 2, prior to the vulcanization step in the vulcanizer 13, the unvulcanized rubber hose 1 is connected between the supply drum 8 and the take-up drum 9 by appropriate driving means (such as rotational drive of the take-up drum 9) FIG. 1 shows the pre-heating device 10 in a state where it is fed and fed by the above-mentioned method. The unvulcanized rubber hose 1 is configured such that a mandrel 3 that is a core material is coated with a cord body including a magnetic metal body 2 that is a reinforcement on the outer periphery, and a rubber material that is a rubber hose body is further coated on the outer periphery. Is done. The magnetic metal body 2 may be configured by embedding a net-like body woven with metal yarns, a helical array, an axial array, or metal powder. The electromagnetic induction coil 5 is loosely fitted over a predetermined length (preferably at least about 30 mm) around the unvulcanized rubber hose 1 thus configured. The electromagnetic induction coil 5 is energized and controlled by power control means 6 described later.

  On the other hand, in the vicinity of the electromagnetic induction coil 5, a speed detection means 4 is provided in contact with the outer periphery of the unvulcanized rubber hose 1 to detect the feed supply speed of the unvulcanized rubber hose 1. In the present invention, energization control to the electromagnetic induction coil 5 is performed according to the feed speed of the unvulcanized rubber hose 1 detected by the speed detection means 4. That is, if the feed speed of the unvulcanized rubber hose 1 is reduced, the amount of electricity (electric power) to the electromagnetic induction coil 5 is reduced, and if the feed speed of the unvulcanized rubber hose 1 is increased, the amount of electricity to the electromagnetic induction coil 5 is reduced. Configured to increase. The detection value from the speed detection means 4 is input to the detection value processing means 7, the processing signal processed by the detection value processing means 7 is converted into a control signal by the power control means 6, and the electromagnetic induction coil 5 is switched to AC. Energize control.

  FIG. 3 shows an example of a general-purpose rotary encoder used in the present invention as the speed detecting means 4. The feed speed of the unvulcanized rubber hose 1 is taken out as the rotation of the rotating body 4A (FIG. 1) in contact with the outer periphery thereof. The rotating body 4A is directly connected to the rotating shaft of the rotary encoder 4. The rotation of the rotating shaft is taken out as a pulse signal between the light emitting diode and the phototransistor arranged to face each other on both sides of the slit disk. A pulse signal corresponding to the rotational speed of the slit disk received by the phototransistor is amplified by an amplifier and taken out as a speed detection value. 1 is converted into a control signal (pulse signal) by the power control means 6 and the electromagnetic induction coil 5 is subjected to AC energization control by pulse control. . For example, every time the unvulcanized rubber hose 1 moves 5 mm, the electromagnetic induction coil 5 is energized for N seconds.

  With this configuration, even if the feed speed of the unvulcanized rubber hose 1, that is, the line speed fluctuates for some reason, the amount of energy applied per unit length of the unvulcanized rubber hose 1 can be made constant. There is no possibility of heating only a specific part of the vulcanized rubber hose 1 or causing insufficient heating. Therefore, even in the main vulcanization following the preheating, a uniform molding process is realized, the quality is ensured, and there is no risk of generating a serious claim. In this example, the injection of energy (electric power) has been described in seconds. However, the type of speed detection means 4, that is, the detection mode, and the type of power control means 6, that is, the control mode can be selected as appropriate.

  In addition to using a rotary encoder to extract the feed speed of the unvulcanized rubber hose 1 as a pulse signal, a laser detector can be used to easily identify the reference part of the unvulcanized rubber hose without using a special device. It is also possible to detect the moving speed of the motor and take it out as an analog signal so that the power control means 6 gives a control signal to the electromagnetic induction coil 5 as a voltage value and a current value. Further, the frequency applied to the electromagnetic induction coil 5 may be changed to change the injection energy as a control signal. FIG. 4 shows these detection modes and control modes. 4A shows an example in which a pulse control signal is obtained based on a detection value extracted as a pulse signal and power control is performed by adjusting the width and interval of energization pulses. In FIG. 4B, analog control is performed. In this example, a control signal having a predetermined voltage value or current value is obtained on the basis of the speed detection value taken out as a continuous signal, and power control is performed based on the magnitude.

  Further, the speed detecting means 4 is installed in the vicinity of the electromagnetic induction coil 5 as shown in the figure, and the speed detecting means 4 is combined with the electromagnetic induction coil 5 as a preheating device 10 to form a device. However, although the speed detection means 4 is installed in the vicinity of the winding drum 9 and needs to be converted into a peripheral speed that is wound up and the winding diameter changes every moment, the rotational speed detection means of the winding drum 9 is required. Can be diverted as a feed speed detection means of the rubber hose, or the speed detection means 4 can be installed in the vicinity of the guide roller, and the rotation speed detection means of the guide roller can be diverted as the feed speed detection means of the rubber hose.

  The embodiments of the present invention have been described above. However, within the scope of the present invention, the shape of the vulcanizing apparatus (horizontal shaft vulcanizing drum, vertical shaft vulcanizing drum, etc.), type (vulcanizing drum) Type that blows hot air into the housed atmosphere, type that arranges steam pipes and heat wires on the wall of the vulcanizing chamber, etc., rubber hose shape, type (layered form of reinforcement, etc.) and material (rubber, synthetic rubber, Equivalent resin that requires sulfur), the shape and form of the magnetic metal body as a reinforcing body (such as a net-like body knitted with metal yarn, a helical array, an axial array, or an embedded metal powder) and materials (A magnetic material can be used as long as it has a reinforcing function.) Shape, type and arrangement of electromagnetic induction coil, shape and type of speed detection means (rotary encoder, laser detector, analog speed Take out the indication pointer) Location (near electromagnetic induction coil, winding drum, feeding drum, guide roller, etc.), detection value form (pulse, voltage, etc.), detection value processing means type and processing form, power control means The format and its control signal form (pulse, voltage, current, frequency, etc.) can be selected as appropriate.

It is the schematic of the principle of the preheating method of the unvulcanized rubber hose of this invention. It is the whole schematic diagram of the manufacturing process of a rubber hose including a vulcanization process. It is a principle perspective view of the general purpose rotary encoder used with the preheating method and apparatus of the unvulcanized rubber hose of this invention. It is explanatory drawing which shows the detection signal from a speed detection means, and the power control signal by a power control means similarly. It is explanatory drawing of the manufacturing method of the conventional rubber hose.

Explanation of symbols

1 Rubber molding (unvulcanized rubber hose)
2 Magnetic metal body 3 Core material (mandrel)
DESCRIPTION OF SYMBOLS 4 Speed detection means 4A Rotating body 5 Electromagnetic induction coil 6 Power control means 7 Detected value processing means 10 Preheating apparatus

Claims (7)

In the preheating method of the unvulcanized rubber hose that preheats the unvulcanized rubber hose containing the magnetic metal body prior to vulcanization by electromagnetic heat generated in the magnetic metal body by energization of the electromagnetic induction coil, it is detected by the speed detection means. A preheating method for an unvulcanized rubber hose, characterized in that the electric power of the electromagnetic induction coil is controlled by pulse control in accordance with the feed speed of the unvulcanized rubber hose. A preheating device is disposed upstream of the vulcanizing device, an electromagnetic induction coil disposed around the unvulcanized rubber hose in the preheating device, and a speed detecting means for detecting a feed speed of the unvulcanized rubber hose. And a detection value processing means for processing a detection value of the speed detection means, and a power control means for controlling the electromagnetic induction coil by pulse control according to a processing signal from the detection value processing means. Preheating device for unvulcanized rubber hose. The pre-heating device for an unvulcanized rubber hose according to claim 2 , wherein the speed detecting means is a rotary encoder. The pre-heating device for an unvulcanized rubber hose according to claim 2, wherein the speed detecting means is a laser detector. The pre-heating device for an unvulcanized rubber hose according to any one of 2 to 4 , wherein the speed detecting means is installed in the vicinity of the electromagnetic induction coil. The pre-heating device for an unvulcanized rubber hose according to any one of 2 to 5, wherein the speed detection means is installed in the vicinity of the winding drum. The preheating device for an unvulcanized rubber hose according to any one of 2 to 5, wherein the speed detecting means is installed in the vicinity of the guide roller.

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