JP2016002712A - Production device for rubber member and method for producing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device and a method capable of suppressing the variation of the discharge quantity of a rubber material extruded from a rubber extruder and producing a rubber member with high molding precision.SOLUTION: Provided is a production device 1 for a rubber member containing a rubber extrusion machine 2 including a charge port 7 to be charged with a rubber material G, an extrusion port 8 from which the rubber material G is extruded and a flow passage 9 for a rubber material communicating the charge port 7 and the extrusion port 8, and comprising a pressure sensor 11 of measuring the pressure of the rubber material G in the flow passage 9 and a controller 5 of controlling the charge quantity of the rubber material G charged from the charge port 7 based on the pressure of the rubber material G measured with the pressure sensor 11.

Description

  The present invention relates to an apparatus and a method for manufacturing a rubber member with high accuracy.

  The following Patent Document 1 proposes a rubber member manufacturing apparatus including a rubber extruder having a charging port into which a rubber material is charged and an extrusion port through which the rubber material is extruded in a predetermined shape. The rubber extruder is provided with a lid that can open and close the extrusion port. In this manufacturing apparatus, the rubber extruder is operated in a state where the extrusion port is closed, and a rubber material is charged from the charging port. Thereby, the pressure of the rubber material in the rubber extruder rises to the reference pressure. This is useful for the stable extrusion of the rubber material when the rubber extruder is started.

JP 2002-086540 A

  However, in the manufacturing apparatus as described above, the pressure of the rubber material in the rubber extruder tends to change during the process of sequentially extruding the rubber material. In this case, there is a possibility that the discharge amount of the rubber material extruded from the extrusion port is likely to vary, and as a result, the molding accuracy of the rubber member may be deteriorated.

  The present invention has been made in view of the above problems, and mainly provides an apparatus and a method that can suppress a variation in the discharge amount of a rubber material extruded from a rubber extruder and can manufacture a rubber member with good molding accuracy. It is aimed.

  The present invention relates to a rubber including a rubber extruder having a charging port into which a rubber material is charged, an extrusion port through which the rubber material is extruded, and a flow path of the rubber material that communicates the charging port and the extrusion port. A member manufacturing apparatus, comprising: a pressure sensor that measures the pressure of the rubber material in the flow path; and the rubber that is charged from the charging port based on the pressure of the rubber material measured by the pressure sensor And a control device for controlling the input amount of the material.

  In the manufacturing apparatus according to the present invention, a screw that pushes the rubber material introduced from the introduction port to the extrusion port while kneading the rubber material is disposed in the flow path, and the pressure sensor is disposed downstream of the screw. It is desirable to be arranged on the side.

  The manufacturing apparatus according to the present invention further includes a feed conveyor that conveys the rubber material and throws the rubber material into the charging port, and the control device controls a conveyance speed of the feed conveyor. It is desirable to have

  The manufacturing apparatus according to the present invention further includes a feed roll for preheating the rubber material charged into the charging port, and the control device includes a second control unit that controls a rotation speed of the feed roll. It is desirable to have.

  The present invention relates to a method of manufacturing a rubber member using a rubber extruder that pushes out a rubber material charged from a charging port from the extrusion port, a charging step of charging the rubber material into the charging port, An extrusion step of pushing the charged rubber material into the extrusion port while kneading, and a pressure of the rubber material pushed into the extrusion port, based on the pressure of the rubber material pushed into the extrusion port. And an input amount increasing / decreasing step for increasing / decreasing the input amount.

  In the manufacturing method according to the present invention, it is desirable that the pressure of the rubber material is measured downstream of a screw for kneading the rubber material.

  In the manufacturing method according to the present invention, in the charging amount increasing / decreasing step, when the pressure of the rubber material is higher than a preset reference pressure, the charging amount of the rubber material is decreased and the pressure of the rubber material is set in advance. When the pressure is smaller than the reference pressure, it is desirable to increase the amount of the rubber material charged.

  In the manufacturing method according to the present invention, the input amount increase / decrease step changes the transfer speed of a feed conveyor that conveys the rubber material and inputs the rubber material to the input port, thereby increasing or decreasing the input amount of the rubber material. It is desirable to include a first input amount increasing / decreasing step.

  In the manufacturing method according to the present invention, the input amount increasing / decreasing step changes a rotational speed of a feed roll for preheating the rubber material input to the input port to increase or decrease the input amount of the rubber material. It is desirable to include a second input amount increase / decrease step.

  The rubber member manufacturing apparatus according to the present invention includes a pressure sensor that measures the pressure of a rubber material in a flow path of a rubber extruder, and a rubber that is charged from a charging port based on the pressure of the rubber material measured by the pressure sensor. And a control device for controlling the input amount of the material. By controlling the amount of the rubber material input, this control device can maintain, for example, the filling rate of the rubber material in the rubber extruder substantially constant, and suppress the pressure fluctuation of the rubber material in the rubber extruder to be small. The rubber member manufacturing apparatus of the present invention can suppress variation in the discharge amount of the rubber material extruded from the rubber extruder, and can manufacture a rubber member with good molding accuracy.

  Further, the pressure of the rubber material in the rubber extruder is changed by other factors such as changes in temperature and temperature, for example, regardless of the amount of the rubber material input from the input port. The rubber member control device of the present invention reduces the pressure fluctuation of the rubber material in the rubber extruder by controlling the amount of the rubber material charged even when the pressure of the rubber material in the rubber extruder changes due to other factors. Can be suppressed. For this reason, the rubber member manufacturing apparatus of the present invention can further suppress variation in the discharge amount of the rubber material extruded from the rubber extruder, and can manufacture a rubber member with higher molding accuracy.

  The method for producing a rubber member of the present invention includes an input amount increasing / decreasing step for increasing or decreasing the amount of rubber material input to the input port based on the pressure of the rubber material pushed to the extrusion port. In this charging amount increase / decrease step, the pressure of the rubber material in the rubber extruder is made substantially constant by increasing or decreasing the charging amount of the rubber material, for example, by maintaining the filling rate of the rubber material in the rubber extruder substantially constant. Can be maintained. For this reason, in the manufacturing method of the rubber member of this invention, the dispersion | variation in the discharge amount of the rubber material extruded from a rubber extruder can be suppressed, and a rubber member with a sufficient shaping | molding precision can be manufactured.

  In addition, the rubber member manufacturing method of the present invention can increase or decrease the input amount of the rubber material even when the pressure of the rubber material in the rubber extruder changes due to the other factors described above. The pressure fluctuation can be kept small. For this reason, in the manufacturing method of the rubber member of this invention, the dispersion | variation in the discharge amount of the rubber material extruded from a rubber extruder can be suppressed further, and a rubber member with a higher shaping | molding precision can be manufactured.

It is a typical side view of the manufacturing apparatus of the rubber member of one embodiment of the present invention. It is an enlarged side view of the extrusion apparatus of FIG. It is a typical side view of the manufacturing apparatus containing the injection | throwing-in means of another aspect.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
The typical side view of the manufacturing apparatus 1 of the rubber member F of this embodiment is shown by FIG. As shown in FIG. 1, the manufacturing apparatus 1 of the present embodiment includes a rubber extruder 2, a charging means 3 for feeding a rubber material G into the rubber extruder 2, and a rubber member F extruded from the rubber extruder 2. And a control unit 5 for controlling the amount of the rubber material G to be fed into the rubber extruder 2. In the manufacturing apparatus 1 of the present embodiment, for example, a belt-shaped rubber member F for molding a tire is continuously manufactured from the rubber material G transferred by the transfer means 4.

  The rubber extruder 2 depicted in FIG. 1 is partially cut away. FIG. 2 shows an enlarged side view of the rubber extruder 2 shown in FIG. As shown in FIG. 1 and FIG. 2, the rubber extruder 2 communicates the insertion port 7 into which the rubber material G is introduced, the extrusion port 8 through which the rubber member F is extruded, and the introduction port 7 and the extrusion port 8. The rubber material G includes a flow path 9 and a rubber extruding screw 10 disposed in the flow path 9.

  In the rubber extruder 2 of this embodiment, the rubber material G introduced from the introduction port 7 is pushed toward the extrusion port 8 while being kneaded in the flow path 9 by the screw 10. The rubber material G pushed by the screw 10 is continuously extruded from the extrusion port 8.

  The cross-sectional shape of the rubber member F extruded from the rubber extruder 2 is substantially determined by, for example, the opening shape of the die plate constituting the extrusion port 8 and the pressure of the rubber material G in the flow path 9. Therefore, the latter factor, that is, keeping the pressure of the rubber material G at a preset reference pressure helps to finish the cross-sectional shape of the rubber member F with high accuracy.

  The rubber extruder 2 is provided with a pressure sensor 11 that measures the pressure of the rubber material G in the flow path 9. As the pressure sensor 11, for example, a known contact sensor is used. As for the pressure sensor 11 of this embodiment, a part of the pressure detection part is distribute | arranged in the flow path 9, for example. In a preferred embodiment, the pressure sensor 11 is disposed between the screw 10 in the flow path 9 and the extrusion port 8. In the flow path 9, the pressure of the rubber material G is not constant, but in the above aspect, the pressure sensor 11 accurately measures the pressure of the rubber material G immediately before being pushed out from the extrusion port 8 that has a great influence on the molding accuracy. Yes.

  As shown in FIG. 1, the conveying means 4 of this embodiment is a roller conveyor, and includes, for example, a receiving roller 4a, an elevating roller 4b, and a conveying roller 4c. The receiving roller 4a takes the rubber member F pushed out from the rubber extruder 2 and delivers it to the conveying roller 4c. The elevating roller 4b disposed between the receiving roller 4a and the conveying roller 4c is configured to be movable up and down according to its own weight and the tension of the rubber member F, for example. For example, a rubber member F is wound around the elevating roller 4b in a substantially U shape. Such an elevating roller 4b can apply a certain tension to the rubber member F extending between the receiving roller 4a and the conveying roller 4c, and prevent the rubber member F from slackening. The elevating roller 4b may be omitted.

  The input means 3 of this embodiment includes a motor M1 and a feed conveyor 3a driven by the motor M1. The feed conveyor 3a is configured as, for example, a roller conveyor or a belt conveyor. The rotation speed of the motor M1 is controlled by the control device 5.

  The control device 5 controls the input amount of the rubber material G input to the rubber extruder 2 based on the pressure of the rubber material G input from the pressure sensor 11. The input amount is defined as, for example, the weight of the rubber material G input into the input port 7 of the rubber extruder 2 per unit time. In order to control the input amount, the control device 5 of the present embodiment includes, for example, a first control unit 5a for controlling the transport speed of the feed conveyor 3a.

  The first control unit 5a adjusts the rotational speed of the motor M1 based on the pressure of the rubber material G, for example, so that the feed speed of the feed conveyor 3a, and hence the input amount of the rubber material G to the rubber extruder 2 is increased. Is controlled.

  Next, the manufacturing method of the rubber member F using the manufacturing apparatus 1 configured as described above will be described. The manufacturing method of the rubber member F according to the present embodiment includes a charging step of charging the rubber material G into the charging port 7 of the rubber extruder 2, and the kneading of the rubber material G charged into the charging port 7 into the extrusion port 8. It includes an extruding step for pushing and an input amount increasing / decreasing step for increasing / decreasing the amount of the rubber material G input to the input port 7.

  In the charging step of the present embodiment, for example, a plastic sheet-like rubber material G is continuously conveyed by the feed conveyor 3a. The conveyed rubber material G is charged into the charging port 7 of the rubber extruder 2 from the feed conveyor 3a. The rubber material G conveyed by the feed conveyor 3a is preferably formed in advance to have a substantially constant thickness (cross-sectional area). Thereby, the conveyance speed of the feed conveyor 3a and the input amount of the rubber material G are substantially proportional.

  In the extrusion process, the rubber material G introduced into the insertion port 7 of the rubber extruder 2 is pushed toward the extrusion port 8 while being kneaded in the flow path 9 by the rotating screw 10. Thereby, the rubber material G is continuously extruded from the extrusion port 8. The screw 10 is rotationally driven by a motor or the like (not shown), and the rotational speed and the like are controlled according to a preset chart. In order to obtain a steady state, when the pressure of the rubber material G reaches a preset reference pressure, the rotational speed of the screw 10 may be controlled to a constant speed.

  In the input amount increase / decrease process, the control device 5 increases or decreases the input amount of the rubber material G based on the pressure of the rubber material G in the flow path 9. More specifically, in the input amount increasing / decreasing step of the present embodiment, the first control unit 5a of the control device 5 controls the conveyance speed of the feed conveyor 3a and inputs the rubber material G to be input to the rubber extruder 2. A first input amount increasing / decreasing step for increasing / decreasing the amount is included.

  In the first input amount increasing / decreasing step, when the pressure of the rubber material G is larger than a preset reference pressure, the control device 5 reduces the conveyance speed of the feed conveyor 3a and decreases the input amount of the rubber material G. Thereby, the filling rate of the rubber material G in the flow path 9 is relatively reduced, and as a result, the pressure of the rubber material G in the flow path 9 is decreased. On the other hand, when the pressure of the rubber material G is smaller than the reference pressure, the control device 5 accelerates the conveyance speed of the feed conveyor 3a and increases the input amount of the rubber material G. Thereby, the filling rate of the rubber material G in the flow path 9 is relatively increased, and as a result, the pressure of the rubber material G in the flow path 9 is increased.

  Therefore, by performing such a first input amount increasing / decreasing step, the filling rate of the rubber material G in the rubber extruder 2 is maintained substantially constant, and as a result, the pressure fluctuation of the rubber material G in the rubber extruder 2 is changed. Smallly suppressed. Thereby, the dispersion | variation in the discharge amount of the rubber member F extruded from the rubber extruder 2 can be suppressed, and the rubber member F with a sufficient shaping | molding precision is manufactured.

  The pressure of the rubber material G in the rubber extruder 2 varies depending on factors other than the amount of the rubber material G charged into the rubber extruder 2, for example, the rotational speed of the screw 10, the apparatus temperature, the rubber temperature, and the like. In this embodiment, the pressure of the rubber material G in the rubber extruder 2 is directly measured by the pressure sensor 11. Therefore, in the input amount increase / decrease process of this embodiment, even when the pressure of the rubber material G in the rubber extruder 2 changes due to factors other than the input amount, the pressure fluctuation of the rubber material G in the rubber extruder 2 is reduced. Can be suppressed.

  FIG. 3 shows another aspect of the charging means 3 as the rubber member F manufacturing apparatus 1. The same components as those in the manufacturing apparatus 1 in FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted here. As shown in FIG. 3, the charging means 3 of this embodiment further includes a feed roll 3 b that preheats the rubber material G charged into the rubber extruder 2.

  The feed roll 3b is arranged, for example, on the upstream side of the feed conveyor 3a, and includes a pair of upper and lower calendar rollers 3c driven by a motor M2. At least one of the calender rollers 3c is heated by, for example, a heater (not shown), and the rubber material G passing between the calender rollers 3c is heated and softened to increase the plasticity. The rubber material G that has passed between the calendar rollers 3c is conveyed to the feed conveyor 3a. The rotation speed of the motor M2 is controlled by the control device 5.

  The control device 5 further includes a second control unit 5b that controls the rotation speed of the calendar roller 3c of the feed roll 3b. For example, the second controller 5b synchronizes the conveyance speed of the feed roll 3b with the conveyance speed of the feed conveyor 3a. More specifically, the 2nd control part 5b synchronizes the conveyance speed of the feed roll 3b with the conveyance speed of the feed conveyor 3a by controlling the rotational speed of the motor M2. Therefore, indirectly, the feed roll 3b is also controlled based on the pressure of the rubber material G. Such a 2nd control part 5b can perform the 2nd injection amount increase / decrease process which controls the conveyance speed of the rubber material G in the feed roll 3b.

  In the second input amount increase / decrease step, the transport speed of the feed roll 3b is controlled by the second controller 5b in synchronization with the transport speed of the feed conveyor 3a, and the transport amount of the rubber material G is increased or decreased. More specifically, when the pressure of the rubber material G is smaller than a preset reference pressure, the transport speed of the feed conveyor 3a is accelerated by the first control unit 5a, and the feed roll is controlled by the second control unit 5b. The conveyance speed of 3b is accelerated so as to be equal to that of the feed conveyor 3a, and the conveyance amount of the rubber material G is increased. On the other hand, when the pressure of the rubber material G is larger than the reference pressure, the transport speed of the feed conveyor 3a is decelerated by the first controller 5a, and the transport speed of the feed roll 3b is set by the second controller 5b. The speed is reduced to be equal to 3a, and the conveyance amount of the rubber material G is decreased.

  The control device 5 of this embodiment suppresses the deformation of the cross-sectional shape of the rubber material G due to the difference in speed between the feed conveyor 3a and the feed roll 3b by synchronizing the feed speed of the feed conveyor 3a and the rubber extrusion. The rubber material G can be stably fed into the machine 2. In another aspect, only the conveyance speed of the feed roll 3b may be controlled by the second controller 5b of the control device 5. In this aspect, for example, the feeding speed of the feed conveyor 3a can be made constant, and the amount of the rubber material G charged into the rubber extruder 2 can be increased or decreased.

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

DESCRIPTION OF SYMBOLS 1 Rubber member manufacturing apparatus 2 Rubber extruder 5 Control apparatus 7 Input port 8 Extrusion port 9 Flow path 11 Pressure sensor F Rubber member G Rubber material

Claims (9)

A rubber member manufacturing apparatus including a rubber extruder having a charging port into which a rubber material is charged, an extrusion port through which the rubber material is extruded, and a flow path of the rubber material that communicates the charging port and the extrusion port. Because
A pressure sensor for measuring the pressure of the rubber material in the flow path;
A rubber member manufacturing apparatus, comprising: a control device that controls an input amount of the rubber material supplied from the input port based on a pressure of the rubber material measured by the pressure sensor. The flow path is provided with a screw that pushes the rubber material charged from the charging port to the extrusion port while kneading the rubber material.
The said pressure sensor is a manufacturing apparatus of the rubber member of Claim 1 distribute | arranged to the downstream of the said screw. A feed conveyor for conveying the rubber material and charging the rubber material into the charging port;
The said control apparatus is a manufacturing apparatus of the rubber member of Claim 1 or 2 which has a 1st control part which controls the conveyance speed of the said feed conveyor. It further includes a feed roll for preheating the rubber material charged into the charging port,
The said control apparatus is a rubber member manufacturing apparatus in any one of Claims 1 thru | or 3 which has a 2nd control part which controls the rotational speed of the said feed roll. A method for producing a rubber member using a rubber extruder for extruding a rubber material introduced from an inlet through an extrusion outlet,
A charging step of charging the rubber material into the charging port;
An extrusion step of pushing the rubber material charged into the charging port to the extrusion port while kneading;
A method for producing a rubber member, comprising: an input amount increasing / decreasing step for increasing / decreasing an input amount of the rubber material input to the input port based on a pressure of the rubber material pushed to the extrusion port .   The method for producing a rubber member according to claim 5, wherein the pressure of the rubber material is measured on a downstream side of a screw for kneading the rubber material. In the charging amount increase / decrease step, when the pressure of the rubber material is larger than a preset reference pressure, the charging amount of the rubber material is decreased,
The method for manufacturing a rubber member according to claim 5 or 6, wherein when the pressure of the rubber material is smaller than a preset reference pressure, the input amount of the rubber material is increased.   The input amount increasing / decreasing step includes a first input amount increasing / decreasing step of increasing / decreasing the input amount of the rubber material by changing a conveying speed of a feed conveyor that conveys the rubber material and inputs the rubber material to the input port. The method for producing a rubber member according to claim 5.   The input amount increasing / decreasing step includes a second input amount increasing / decreasing step of increasing or decreasing the input amount of the rubber material by changing a rotation speed of a feed roll that preheats and conveys the rubber material input to the input port. The manufacturing method of the rubber member in any one of Claims 5 thru | or 8 containing.

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