JPS5874340A - Continuous vulcanizing method for rubber or plastic long-sized object - Google Patents

Abstract

PURPOSE:To uniformalize a coating thickness of an extruded object such as rubber and to finish an outer diameter of a long-sized object into an uniform size, by a method wherein a long-sized object is forcibly pushed into a cross head at a constant speed by a pushing device, and a draw-off speed is controlled. CONSTITUTION:A pushing device 8 causes a core S' to pass through a cross head at a constant speed, and an extruded object such as rubber is evenly coated on the core S'. Through the working of a slack sensor 20, a long-sized object S is normally brought to more than a given slack, and even if a undulating phenomenon occurs during running of the long-sized object S due to friction between a seal packing and the long-sized object S', the undulating phenomenon is absorbed by a slack part S1.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a continuous vulcanization method for long articles such as rubber or plastic hoses, or rubber or plastic electrical wires.

In general, in such a vulcanization method, the seal portion 1 of the cooling tank, for example, a long seal packing made of 3mm Pl! Jll-rubbing between the periphery of the IJ tracing application hole and the long object causes a hiccup phenomenon in the running of the long object, that is, vertical vibration that vibrates in the length direction of the long object, and this hiccup phenomenon causes the crosshead. He was even aware of the long objects inside. As a result, the running speed of the long object within the crosshead fluctuates, and the test thickness of extrudates such as rubber becomes uneven, resulting in the problem that it becomes impossible to uniformly finish the long object to a predetermined outer diameter. there were.

The present invention solves the above-mentioned problems, and prevents the phenomenon of long objects from extending to the part of the long object inside the crosshead, and also prevents the part of the long object passing through the crosshead. By forcing the speed to be constant, the test thickness of extrudates such as rubber is made uniform, and the purpose is to perform VC so that the outer diameter of long products can be finished uniformly. The present invention will be explained below based on the drawings.

FIG. 1 shows a continuous vulcanization apparatus for carrying out the present invention,
In FIG. 1, 1 is a crosshead of an extruder 2, and as it goes from this crosshead 1 to the side F in the feeding direction of the long material 8 (core 8'), there is a vulcanized cypress 4% separation chamber 5, a cooling A tank 6 and a take-up device 7 are arranged in this order, and a pushing device 8 is arranged on the inlet side of the crosshead 1 (on the left side in FIG. 1). The inlet end of the vulcanization tank 4 is directly connected to the crosshead 1,
The inlet end of the separation chamber 50 is directly connected to the vulcanization tank 4 with a gap of 0'i apart. Cooling tank 6 arrow)゛Direction VC1'&
A large number of rubber sealing buttons 12 are provided at intervals of thJ. The vulcanization tank 4 does not contain a high-temperature vulcanization medium, and the cooling tank 6Ku does not contain cooling water.

Reference numeral 13 denotes a vulcanizing medium circulation pump which returns the vulcanizing medium from the vulcanizing tank 4 to the separation chamber 5 to the inlet of the vulcanizing tank 4.

14 is a cooling water circulation pump, 15 is a cooler, and after the cooling water leaking from the outlet of the cooling tank 6 is cooled by the cooler 15, it is returned to the circulation pump 141/<: Therefore, the cooling water is returned to the input part of the cooling tank 60. . A partition wall 7'I-fc provided at the bottom of the separation chamber 5 separates the vulcanizing medium leaking from the chambers 1o and 2 from the cold pot.

□1 The taking device [17] and the pushing device 8 are equipped with a fidget t1 drive motor 16.17, and both drive motors 16.1
7 is connected to a rotation control device 18, and the VC is set such that both drive motors 6° and 7 operate synchronously based on the action VC of this control device. The pushing device 8 is always driven at a constant pushing speed. On the other hand, the take-up device 7 is connected to a drive motor 16 via a transmission 19,
This transmission device 19 is connected to a slack sensor 20 disposed in the separation chamber 5, and changes the picking speed of the picking device 7 according to a command (signal) from the slack sensor 20.
K so that it can be temporarily faster than the pushing speed of 8.
It has become. The slack sensor 20 is used to check the degree of slack in the long object 8 in order to ensure that the portion of the long object 6 in the separation chamber 5 always has a slack above a certain value. When the amount becomes lower, a command is sent to the operating section 21, and the operating section 21. Activate the gearbox fjiL.
]9fc-switch. That is, 1. so that the picking speed becomes temporarily a little slower than the pushing speed; 1. ：、〈Switch・
The pushing device 8 pushes the core 8°σ, which always passes through the crosshead at a constant speed, and the part near the exit of the crosshead 1 (
At the die part in Fig. 3), the extruded material such as rubber from the extruder 2 is covered, then vulcanized in the vulcanization tank 4, and passed through the separation chamber 5 while maintaining slack. , cooled in the cooling tank 6, taken up by a take-up device [17], and supplied to a winding bobbin.

In the cooling tank 6, the elongate object 8 passes through the elongate object passage hole of each seal gasket 12, and the periphery of the elongate object passage hole and the outer circumferential surface of the elongate object 8 come into sliding contact with each other under constant pressure. In addition, vulcanization tank 4
The diameter of the hole for passing a long object in the packing 10 between the packing and the separation chamber 50 is slightly larger than the outer diameter of the long object. It does not make much sliding contact with the outer peripheral surface of 8.

Advantageously, the method according to the invention allows the core b to be pushed to the speed f' as it passes through the crosshead 1, forcing it to a constant speed 11 and controlling the withdrawal speed of the VC1. In order to continuously vulcanize the long object 8 while maintaining the slack t always above a certain value, the core 8' is moved inside the crosshead at a constant speed. Because it passes.

Core 8 is an extruded material such as rubber! Since the long object 8 is always nucleated uniformly and the long object 8 always sag by more than a certain VC value, the single-acting VC of the seal packing 12 and the long object 8 causes a sagging phenomenon in the running of the long object 8. Also, the sagging phenomenon is absorbed by the slack part 81-6 1/(of the long object 8) and is affected by the part of the long object 8 (core S') in the crosshead 1 and near the crosshead 1. Wisdom will never reach you.

FIG. 2 is an enlarged view of part A in FIG. 1, and shows an example J of the slack sensor 20. In FIG. 2, there is a switch lever 26 with 20 slack sensors provided in one section 5, a row 927 rotatably supported at the lower end of the switch lever 26, and a switch case 28 equipped with a normally open switch mechanism. It consists of The upper end of the switch lever 26 is rotatably supported on the switch case 28, and an appropriate stopper (not shown) eC brings the roller 27 into the state shown in FIG.
The switch lever 26 is tilted toward the arrow F side from the upper end, giving slack to the weight of the roller 27. When the blade is rotated (in the direction of arrow A), the normally open switch 11 inside the switch case becomes ON, and the long object 8 that sends a command to the speed change operation section 21 is turned on. When there is a certain amount of slack (more than a predetermined value), the normally open switch mechanism in the switch case 28 remains OFF, no command is sent to the operating section 21, and the amount of slack in the long object 8 is reduced. When the roller 27 is pushed up by the elongated object 8, the switch mechanism is turned on, and a command is sent to the operating section 21. Note that an annular kite groove for guiding the elongated object S is formed on the outer wall of the roller 27.

FIG. 3 is an enlarged longitudinal cross-sectional view of part B in FIG. 1, and is a ninth means for reliably transmitting the pushing action of the pushing device 8 at a constant speed to the part S of the long object near the die 1a of the crosshead 1. It shows. That is, in FIG. 3, 3] is a nipple holder that connects the crosshead 1 through a bush
The part of the nipple holder 31 on the inlet side of the crosshead 10 (left side in Figure 3) protrudes into the pushing device 8 (1111), and the adjustment bolt 34
A cross heel 3]a is fixed so as to be freely adjustable in position in the forward arrow l' and reverse arrow l' directions. nipple holder 3
The inner diameter of core 8' (the diameter of the core passage) is slightly larger than the diameter of core 8'. The pushing device i18 is close to the inlet end of the nipple holder 31 (the left end in FIG. 3). Therefore, between the pushing device 118 and the inside of the crosshead 1, the core 8' does not slacken or slip off the screw 17', and the pushing action (pushing speed) by the pushing device 8 is It is possible to reliably transmit the information to the nearby core S' part.If it is not possible to bring the nipple holder 3 and the pushing device 8 close together simply by adjusting the position of the nipple hole f-31, the nipple holder 3 has the same inner diameter as the holder 31. What is necessary is to add a cylindrical guide having a shape to the entrance end side of the nipple holder 31.

As the pushing device, a caterpillar type device as shown in FIG. 1 or a pinch roller type device as shown in FIG. 4 may be used.

In other words, in the case of Figure @4, when the core 8' is sandwiched between the lower moving roller 35 and the upper 1ill driven roller 36, the tl.
(.

A hydraulic cylinder 37 presses the driven roller 36 downward with a constant pressure.

An example in which the outer layer 52 of a rubber hose as shown in FIG. 6 was actually bonded and vulcanized according to the present invention using the apparatus shown in FIG. 1 will be shown below. However, in FIG. 6, the inner diameter of the inner layer rubber 53 is 1qlQalφ, the outer diameter H]8alφ, and the outside of the cotton braid 54 is <kt619wp.

The target finishing outer diameter of the outer layer 52 is 022alφ.Results In response to the above results, the pushing device 1t8 is
When vulcanization was carried out in the * condition without forcible pushing and the take-up speed was kept constant, the following results were obtained.

FIG. 5 shows another vulcanizing apparatus for implementing the present invention, in which a stationary roller 40 and a moving roller 41 are provided in a separation chamber 5.
The slack f (th The amount of downward protrusion shown in Fig. 5) is set to exceed a certain value.

To explain in detail, the stationary roller 40 is, for example, a separate roller 4I1.
The movable roller 41 is rotatably supported on the 01ll wall of No. 5 via a horizontal axis, and is disposed below the stationary roller 40, and is movable vertically and rotatably in the item of the separation chamber 5, for example. The supported numeral 042 is a level sensor that checks the vertical position of the movable roller 41. When the movable roller 4 rises above a predetermined height σ), a signal is sent from the level sensor 4 to the operating unit 21. will be issued, and the collection speed will be temporarily slowed down. In other words, the slack in the accumulator section cannot always be maintained above a certain value. Therefore, even if the device shown in Fig. 5 is adopted, the core 8' pipe crosshead is always moved at a constant speed by the constant speed pushing device 8. By passing through the accumulator and controlling the take-up speed, it is possible to make the elongated object 8 slack by a certain amount or more at the accumulator section.

Furthermore, the weight 1 t of the moving roller 41 can reliably cause the long object 8 to sag downward, and the long object 8 will not sag upward or in the left-right direction (direction perpendicular to the plane of the paper in FIG. 5). 4. Therefore, the amount of slack can be easily and reliably detected by the level sensor 42.0 As explained above, according to the present invention, the constant speed pushing device 8
By forcing the long object i8 (core b')lr into the crosshead at a constant VC speed and controlling the take-up speed, the long object 8VC is always given slack above a certain value to absorb tension. Therefore, the thick part between the seal packing 12 of the cold 11116 and the long object 8 prevents the long object 8 from closing.
Even if a sagging phenomenon occurs, most of it is absorbed by the slack part, and the constant speed pushing device &8 cross head]
The speed of the cores 8' within the core 8' can be forcibly adjusted to a constant speed. Therefore, the thickness of the powder coating of extrudates such as rubber can be made uniform,
It is possible to uniformly finish the long object 8 to a predetermined outer diameter.In addition, if the separation chamber 5 is equipped with a sag sensor 20 (Fig. 1) or an accumulator (Fig. 5), the sag sensor 20 or accumulator (Fig. Is the operation accurate and circular? lI
K, and easy to inspect and repair) VC.

1:1 In addition, a sag sensor 20 as shown in Fig. 2 is installed in the vulcanization tank 4.
In preparation for this, the elongated object 8 may be given a slack of a certain value or more in the vulcanization tank 4.

[Brief explanation of drawings]

FIG. 1 is a schematic vertical cross-sectional view of a vulcanizing apparatus for carrying out the present invention, and FIG. 2 is an enlarged cross-sectional view of three parts of FIG. 1. Fig. 3 is an enlarged sectional view of part B in Fig. 1, Fig. 4 is a schematic side view showing one example of a pressing device, Fig. 5 is a schematic longitudinal sectional view showing another vulcanizing device, and Fig. 6 is a long water vulcanization device. FIG. 2 is a sectional view showing an example of the object. l...Crosshead, 2...Extruder, 4...Vulcanization tank, 6...Cooling tank, 7...Take-off/device 28...
Push-in position,] 2...Seal para-scan (seal part) Patent applicant: Dainichi Nippon Electric Cable Co., Ltd. Continued from page 1 ■Applicant: Mitsuha Seisakusho Co., Ltd. 5-1-1 Koyama, Honbunagawa-ku, Tokyo

Claims (1)

[Claims] In a continuous vulcanization method in which a long rubber or plastic material is passed from the crosshead of an extruder into a vulcanization tank, and then fed to a winding device through a seal in a cooling tank, it is placed at the inlet of the crosshead. A constant speed pushing device pushes the long object into the crosshead at a constant speed, and the tension of the long object is constantly absorbed by controlling the take-up speed of the cooling tank outlet (till VC installed). Continuous vulcanization method for long rubber and plastic objects characterized by