KR100617996B1 - Device for controlling thickness of rubber sheet - Google Patents

Abstract

The present invention relates to a rubber sheet thickness control apparatus for a tire, and to detect an extrusion gap of a seating mill, and to control the extrusion gap by feedback, so that the thickness of the rubber sheet can be controlled to a desired thickness. .

The rubber sheet thickness control apparatus of the present invention is adapted to adjust the extrusion gap of the seating mill 30 having the high precision 32 at the top and the bottom flow mill 34 at the extruder outlet, so as to adjust the extrusion gap of the flow mill. Hydraulic means (40) for elevating (36); A displacement sensor (50) installed at a lower portion of the axis of the flow mill and detecting a displacement caused by the elevation of the flow mill; And a controller (Controller) 60 controlling the driving of the inflow means to control the extrusion gap set according to the signal input from the displacement sensor. Therefore, when the pressure inside the extruder increases and the flow mill 34 falls, the displacement is sensed by the displacement sensor 50 and input to the controller 60. The controller 60, by controlling the driving of the hydraulic means 40 to increase the hydraulic pressure in accordance with the set extrusion gap, the flow mill 34 can be raised by the falling displacement to maintain a constant extrusion gap, rubber sheet 10 may be extruded to a constant thickness.

Tire, Rubber, Rubber Sheet, Extrusion, Thickness, Thickness Control, Thickness Control, Displacement Sensor

Description

Rubber Sheet Thickness Control Unit {DEVICE FOR CONTROLLING THICKNESS OF RUBBER SHEET}

1 is a block diagram showing an extruder provided with a rubber sheet thickness control apparatus according to the present invention.

2 is a partially enlarged view of FIG. 1.

3 is a front view showing a displacement sensor constituting the rubber sheet thickness control apparatus according to the present invention.

4 is a front view showing the installation state of the displacement sensor constituting the rubber sheet thickness control apparatus according to the present invention.

<Explanation of symbols for the main parts of the drawings>

10: rubber sheet, 20: rubber sheet extruder,

30: sheeting mill, 32: high precision,

34: fluid mill, 36: axis number of the fluid mill,

40: hydraulic means, 60: controller,

50: displacement sensor, 52: lifting shaft,

54: sensing unit, 56: spring,

58: fixed plate, 70: display device,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rubber sheet thickness control apparatus, and more particularly, to a rubber sheet thickness control apparatus capable of appropriately controlling the thickness of an extruded rubber sheet when a rubber sheet, which is a tire material, is extruded.

A tire consists of many rubber parts assembled, and rubber sheets are used to make the rubber parts. The rubber sheet is extruded by inserting the compounding rubber into the extruder and transferring the compounding rubber introduced into the extruder to a seating mill composed of a pair of mills rotatable to an extrusion screw.

By the way, since the thickness of the rubber sheet should be changed according to the rubber parts of the tire, it is necessary to adjust the extrusion gap of the seating mill.

Therefore, conventionally, by setting the rotational speed of the extrusion screw and the seating mill, a method of maintaining the thickness of the desired rubber sheet was applied. In addition, a method of providing a level sensor inside the extruder and controlling the rotational speeds of the extrusion screw and the seating mill with respect to the set level of the compounding rubber fed into the extruder is also applied. That is, if the amount of compounding rubber injected into the extruder is large, the rotational speed of the extrusion screw and the seating mill is increased, and if the amount is small, the rotational speed of the extrusion screw and the seating mill is slowed, and the pressure applied to the seating mill by the compounding rubber is constant By doing so, the thickness of the rubber sheet is maintained.

However, in the conventional rubber sheet thickness control technique as described above, when there are too many compounding rubbers in the extruder, the pressure applied to the seating mill becomes too large, and the gaps between the mills forming the seating mill are greatly increased and the extrusion gap is increased. There is a problem that the thickness of the extruded rubber sheet becomes thick.

In addition, when there is too little compounding rubber in the extruder, the pressure on the seating mill decreases, and the extrusion gap becomes smaller, and the rubber sheet becomes too thin and broken, or the model of the normal rubber sheet cannot be obtained due to uneven loading. .

In addition, when controlling the thickness of the rubber sheet using the level sensor, since the reflecting plate of the level sensor is easily contaminated by rubber or other foreign matter, a problem occurs due to malfunction of the level sensor. In addition, in order to clean the contaminated reflector, the operator must go directly into the extruder and process it, which not only entails a significant risk, but also causes a large economic loss due to a decrease in productivity due to the inoperation of the extruder. .

The present invention has been made in consideration of the above-described conventional problems, and aims to control the thickness of a rubber sheet to a desired thickness by sensing an extrusion gap of a seating mill and controlling feedback of the extrusion gap.

In order to achieve the above object, the present invention, the rubber sheet thickness control device for controlling the thickness of the rubber sheet to be extruded by adjusting the extrusion gap of the seating mill having a high precision of the upper and a flow mill of the lower installed at the exit of the rubber sheet extruder A pair of hydraulic means for elevating both bearings of the flow mill to adjust the extrusion gap; A displacement sensor installed at a lower portion of the axis of the flow mill and detecting a displacement caused by the elevation of the flow mill; And a controller for controlling the driving of the inflow means to control the extrusion gap set according to the signal input from the displacement sensor.
The displacement sensor includes a lifting shaft in contact with the number of shafts of the flow mill, a sensing unit installed at the lower portion of the lifting shaft, a spring installed at the lower portion of the sensing unit, and a fixing plate for supporting the spring.

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In addition, a display device for displaying various data may be further connected to the controller.

The features and advantages of the present invention will become more apparent from the following detailed description based on the accompanying drawings. Prior to this, the terms or words used in the present specification and claims are based on the principle that the inventor can appropriately define the concept of terms in order to explain the invention in the best way. It should be interpreted as meanings and concepts corresponding to

1 schematically shows an example of a rubber sheet extruder to which a rubber sheet thickness control apparatus according to the present invention is applied.

As shown in FIG. 1, a mixer 22 to mix rubber materials is installed at an upper portion of the rubber sheet extruder 20, and a compound rubber is introduced into the extruder 20 at a lower portion of the mixer 22. Hopper 24 is installed. In addition, the extruder 20, the extrusion screw 26 is installed in a horizontal structure so as to feed the compounding rubber toward the outlet of the extruder 20, the seating mill 30 is provided at the outlet of the extruder 20. have.

The seating mill 30 includes a high precision 32 at the top and a flow mill 34 at the bottom. As shown in FIG. 2, the flow mill 34 has mill guides 29 formed at both support portions 28 and 28 of the extruder 20, and both shafts 36 and 36 are provided. It can be lifted by being supported by lifting. Therefore, when the pressure of the compounding rubber pressurized by the extrusion screw 26 toward the seating mill 30 becomes large, the flow mill 34 descends along the mill guide 29, whereby the high precision 32 and the flow mill 34 are reduced. The extrusion gap, which is a gap between them, becomes large, and accordingly, the thickness of the rubber sheet 10 to be extruded becomes thick.

Therefore, the thickness of the rubber sheet 10 is controlled by elevating the flow mill 34. In the present invention, as shown in FIG. 2, both axes 36 and 36 of the flow mill 34 are controlled. By raising and lowering by a pair of hydraulic means 40 and 40, an extrusion gap is adjusted.

In addition, in order to be able to detect a change in the extrusion gap according to the lifting of the flow mill 34, a displacement according to the lifting of the flow mill 34 is lowered below the shaft 36 of the flow mill 34. The displacement sensor 50 for detecting is installed.

2 to 4, the displacement sensor 50, the lifting shaft 52 in contact with the axis number 36 of the flow mill 34, and is provided in the lower portion of the lifting shaft 52 It may include a sensing unit 54, a spring 56 installed below the sensing unit 54, and a fixing plate 58 for supporting the spring 56. That is, the sensing unit 54 may be protected by the buffering effect of the spring 56, and the fixing plate 58 may minimize the influence of vibration or other noise. In addition, the fixing plate 58 is placed on the hydraulic means 40, the displacement sensor 50 may be installed between the bearing 36 and the hydraulic means (40).

Further, a controller 60 for controlling the driving of the hydraulic means 40 is further provided to control the extrusion gap set according to the signal input from the displacement sensor 50, and the controller 60 includes various data. The display device 70 may be connected to display.

Next, the operation of the rubber sheet thickness control apparatus according to the present invention configured as described above will be described.

When the compounding rubber is introduced from the mixer 22 into the extruder 20 through the hopper 24, the compounding rubber is pushed toward the seating mill 30 by the rotation of the extrusion screw 26, and the seating mill 30 The rubber sheet 10 is extruded through the extrusion gap.

When the pressure of the compounding rubber to be fed is increased, the flow mill 34 is lowered, the displacement is detected by the displacement sensor 50 is input to the controller 60. The controller 60 controls the driving of the hydraulic means 40 so that the oil pressure rises according to the set extrusion gap, so that the flow mill 34 can be raised by the falling displacement so as to maintain a constant extrusion gap. Therefore, the rubber sheet 10 may be extruded to a constant thickness. In the process of controlling the thickness of the rubber sheet, various data are displayed on the display device 70, so that the operator can easily monitor the presence or absence of thickness abnormality of the rubber sheet 10.

According to the rubber sheet thickness control apparatus according to the present invention configured as described above, by detecting the change in the extrusion gap of the seating mill 30 according to the lifting and lowering of the flow mill 34, according to the extrusion gap set in the controller 60 Since the rubber sheet 10 of the desired thickness may be extruded, the extrusion gap of the seating mill 30 may be automatically controlled, thereby improving the quality of the rubber sheet 10.

In addition, even when the displacement sensor 50 or the like fails, since only the displacement sensor 50 needs to be replaced without entering the extruder 20, maintenance / repair is easy. In addition, in this case, since the extruder 20 can be continuously operated, the productivity of the rubber sheet 10 can be increased, thereby reducing the economic loss.

Claims (3)

A seating mill 30 having a top high precision 32 and a bottom flow mill 34 installed at an outlet of the rubber sheet extruder 20 and a shaft 36 and 36 of both sides of the flow mill are moved up and down. Hydraulic means (40) for adjusting the extrusion gap of the seating mill; A displacement sensor (50) installed at a lower portion of the axis of the flow mill and detecting a displacement caused by the elevation of the flow mill; And a controller (Controller) 60 controlling the driving of the inflow means so as to control the extrusion gap set according to the signal input from the displacement sensor. In the tire rubber sheet thickness control device for controlling the thickness of the rubber sheet 10 to be extruded by adjusting the extrusion gap of the seating mill: The displacement sensor 50, the lifting shaft 52 in contact with the number of shafts 36 of the flow mill 34, the sensing unit 54 is installed in the lower portion of the lifting shaft, and the spring is installed in the lower portion And a fixing plate (58) for supporting the spring. delete The method of claim 1, Rubber controller thickness control device, characterized in that the display device 70 for displaying various data is further connected to the controller (60).

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