JPH04126881A - Heat-treatment of rope - Google Patents

Abstract

PURPOSE:To obtain a rope free from dimensional change with time and useful for set-net, etc., by passing a rope of a polyolefin strand through a pressure vessel having inlet and outlet, sealing the vessel while keeping the rope in stretched state, evacuating the vessel and heating the rope with high-pressure steam. CONSTITUTION:A rope 1 of a polyolefin strand is passed from an inlet to an outlet through a pressure vessel A having an inlet and an outlet sealable with sealing mechanisms B. A tension is applied to the rope 1 to an extent not to slacken the rope with rope-holding mechanisms D, E placed at the outside of the inlet and outlet of the vessel A. The rope 1 is sealed, the vessel A is evacuated while keeping the rope in the above state and high-pressure steam is introduced into the vessel A with a high-pressure steam supplying means I to effect the heat-treatment of the rope 1. The sealed state is broken, the rope of the heat-treated part is moved and delivered from the vessel to introduce an untreated rope 1 into the vessel A, the rope is stopped and the transfer and heat-treatment of the rope 1 are intermittently repeated to perform the heat- treatment of the rope 1.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for heat treating a rope made of polyolefin strands used for cultivating nets such as scallops, fixed nets, and the like.

BACKGROUND OF THE INVENTION Conventionally, a technique described in Japanese Patent Publication No. 59-47075 has been known as a technique for heat treating a rope made of polyolefin slenderland.

This technique is characterized by forming a polyolefin strand into a rope, and then heat-treating the rope by passing it through steam while keeping it under tension to the extent that it does not loosen. Furthermore, the tension is maintained by wrapping the rope several times around the front capstan roll, guiding it into the steam, passing through the steam, wrapping the rope several times around the rear capstan roll, and pulling it. It is characterized by the fact that

Problems to be Solved by the Invention In general, ropes used for aquaculture nets and fixed nets for scallops and the like are required to be flexible even when immersed in water, and not to expand or contract due to aging.

However, this technology
The first run can be made into a rope and then heat treated by passing it through steam while keeping the rope under tension to the extent that it does not loosen, making the process from rope making to heat treatment continuous. On the other hand, when these ropes become thicker than ten millimeters, for example, when they are passed through steam for heat treatment, the ropes are heated by the steam. Although the rope shrinks, the steam does not penetrate into the inside of the rope, so the outside is heat-treated and shrinks, while the inside is not sufficiently heat-treated and shrinks insufficiently. As a result, the rope is tightly tightened from the outside (outer circumference) and loses its flexibility. Moreover, since the inside has not been sufficiently heat treated, there is a risk of elongation due to aging.

The present invention was developed with the aim of solving the above-mentioned problems.

Means for Solving the Problems As shown in FIGS. 1 to 7b, the present invention provides a rope 1 made of polyolefin 1-run I. The rope is penetrated from the L1 section to the outlet L1 section, and maintained in a tensioned state to the extent that the rope does not loosen outside the entrance/exit section of the container.
After sealing the rope 1 and reducing the pressure inside the container A to create a vacuum while maintaining that state, high-pressure steam is applied to the inside of the container A to heat-treat the rope 1, and then the seal is released and the rope 1 is heated. The rope 1 in the heat-treated portion is moved and carried out from the container, and the untreated rope 1 is carried into the container A to stop the movement of the rope 1, and the movement of the rope 1 and the heat treatment are repeated intermittently. This is what I decided to do.

Example Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIGS. 1 and 2, the device for carrying out the present invention has a rope 1 at the entrance and exit portion of a pressure-resistant cylindrical body 2 through which ropes 1 of polyolefin series 1 to runs 1 pass through.
A pressure vessel A integrally formed by joining the cylinder body 2 and a sealing mechanism B that can seal the body and leave a gap with the rope when released is fixedly disposed on the leg body 3, and the pressure vessel A is fixedly disposed on the leg body 3. A 10th rope holding mechanism C and a 20th rope holding mechanism C that maintains a tensioned state to the extent that the rope 1 passing through A does not loosen.
Lobe holding means E equipped with a rope holding mechanism is disposed at an external position of the entry and exit portion 1'' of the rope 1 of the pressure vessel A, and the rope 1 is passed through the inside of the pressure vessel A by the rope holding means E. A fixed length intermittent transfer means G is provided with a length measuring mechanism F for detecting a predetermined length of the rope and a motor 5 for moving the rope to a predetermined length according to a signal from the length measuring mechanism A pressure reducing means H, which is provided at an external position of the container A and connected to the tenth holding mechanism C, and which reduces the pressure inside the pressure container A to create a vacuum state, is controlled from the outside of the pressure container A to the inside thereof. A high-pressure steam supply means (2) for supplying and exhausting high-pressure steam into the pressure vessel A is provided so as to be controllable from the outside to the inside of the pressure vessel A, and further, by the fixed-length intermittent transfer means G. A winding means J for winding up the rope to be transferred] is disposed at the next process position of the rope holding means E, and the rope 1 staying in the pressure vessel A is intermittently transferred and stopped. During the stoppage, the pressure inside the pressure vessel A is reduced to a vacuum, and then high-pressure steam is applied to heat the rope 1 to heat it and wind it up.

Next, the details will be explained.

As shown in FIGS. 1 and 2, the tenth-pull holding mechanism C and the tenth-pull holding mechanism C, as shown in FIGS. The pulley is rotatably supported by a bearing 7a, and a clutch/brake 9 is attached to the pulley.The clutch/brake is attached to fixed supports 8a, 8b, and the movement of the motor 5 and the operation of the clutch/brake 9 causes Rotate the multi-wound pulley 6,
It is designed to be able to stop and brake.

Then, the clutch of the clutch/brake 9 is actuated to connect both multi-wound pulleys 6.6 to the shaft 7.7, and then the motor 5 is actuated to move the rope 1. Then, the motor 5 is stopped by a signal from the length measuring mechanism F, and the brakes of the 10th-branch holding mechanism C and the 20th-brake holding mechanism are actuated to fix the multi-wound pulley 6.6. This makes it possible to maintain a tensioned state to the extent that the rope does not loosen.

In addition, as a means for maintaining the tension state to such an extent that the rope does not loosen, for example, the motor 5 may be used as a brake motor and the multi-wound pulley 6 of the 20th rope holding mechanism may be braked. The present invention is not limited to the embodiments.

The length measuring mechanism F is installed on the outlet side of the pressure vessel A, as shown in Figs. 10a and 1.
Ob is supported by bearings 11a and llb, and bearing 1
1. The pulleys 10a and 10b are rotatably supported by adjusting the distance between the pulleys 10a and the bearing 11b using an adjustment bolt 12b through which a spring 12a is inserted to prevent slippage.

Further, a rotary encoder 13 is connected to the shaft of the lower pulley 10b. When the rope moves, the pulleys 10a and 10b rotate, causing the rotary encoder 13 to rotate.The length of the rope that has been heat-treated is set in advance in the rotary encoder, and the rotary encoder 13 rotates. When the set value is reached, a signal is sent to the motor 5 and the winding means.
(2), the motor 5 shown in FIG. 1 is stopped, and the rope is intermittently transferred over a predetermined length.

As shown in FIG. 2, the pressure reducing means H is configured to be piped from the pressure vessel A to the vacuum pump 6 via an automatic valve 5 and to reduce the pressure inside the pressure vessel A to create a vacuum state. be,.

As shown in FIG. 2, the high-pressure steam supply means (2) is connected to a high-pressure steam source 18 from the pressure vessel A via an automatic valve 7, and from the pressure vessel A to the automatic valves 9 and 1 to lap 20. The pipes are connected in parallel and are configured to supply high-pressure steam into the pressure vessel A, and exhaust the air to heat the rope 1 with the steam at temperatures below 0'C.

As shown in FIGS. 5 and 6, the sealing mechanism B is formed so that the shape of the inner circumferential surface approximately matches the cross-sectional outline of the rope 1 and is provided with an appropriate gap from the rope, and its outer circumferential surface will be described later. A bag ring 21 made of an elastic material such as a heat-resistant rubber material that can be inserted into the bag casing and has a fluid supply port 21a, and gaskets that accommodate the bag ring and are attached to the outlet and inlet surfaces of the cylindrical body 2 of the pressure vessel. The bag casings 22a, 22b and the bag casings 22c, 22d are provided in a manner that they can be sealed and fixed with the automatic valve 24 from the high-pressure fluid supply source 23 that supplies high-pressure fluid such as pressurized air into the bag casings. It is constructed by a pressurizing means provided so as to inflate the bag ring 21 through the bag ring 21.

Then, by operating the pressurizing means K, the bag ring 21 is expanded, but the outer circumferential surface of the bag ring 21 is attached to the bag casings 22a, 22b, and the outer circumferential surface of the second stage bag ring 21 is attached to the bag casing 22c. , 22d
Since the bag link 21 is held down by the bag link 21 and both sides are also held down, the expansion of the bag link 21 acts in the direction of its inner circumference, reducing its inner circumference and tightening the rope passed through it as shown in Figure 7b. The action works. And the 7th b.
As shown in the figure, it can bite into the uneven parts of the rope [4] and form a seal. Further, when the automatic valve 24 in the pressurizing means is reversely activated and the automatic valve 25 is activated, the inside of the bag ring 2 is exhausted, and the pack ring 21 is contracted and the fifth
As shown in Fig. 2 and Fig. 7a, it returns to its original shape and a gap is created between it and the rope 1, so that the pressure inside the pressure vessel A returns to atmospheric pressure with the opening of the automatic valve 19 shown in Fig. 2. , the rope 1 can be moved by a predetermined dimension.

Although a heat-resistant rubber bag is used as the pack ring in the embodiment of the present invention, for example, the bag link may be evacuated by using a stretchable plastic film, or by reducing the pressure instead of evacuation. Furthermore, the bag ring does not necessarily have to be in the form of a link; for example, it may be sealed by disposing elastic bags on the top and bottom or on the left and right, and inflating the hacks. In the example, sealing is performed in two stages, but if the pressure inside the pressure vessel is low, one stage is sufficient, and at higher pressures or higher vacuums, complete sealing can be achieved by using three or more stages. Not done.

As shown in FIGS. 1 and 2, the winding means J includes a 10th
- It winds up the heat-treated rope 1 being pulled by the rope holding mechanism C, and rotatably supports the winding 1-ram 26, and the shaft portion 26a of the drum is connected to the torque motor 2.
Although not shown in the drawings, the rope 1 is connected to the rope 7 and is further configured to wind the rope 1 to a specified length by performing a 1-rubber while winding the rope using a known 1-rubber mechanism (not shown).

In addition, before! 81~ Even when the torque motor is not rotating, apply appropriate tension to the rope 1 of the 10th rope holding mechanism υ,
Then, the motor 5 of the constant length intermittent transfer means G can also be used, and the brake of the tenth pull holding mechanism C can also be used, and the present invention is not limited to this embodiment.

Next, its effect will be explained.

As shown in FIGS. 1 and 2, the present invention provides for a rope 1 made of a polyolefin strand to be passed through a pressure vessel A from an entrance to an exit in a pressure vessel A in which the entrance and exit can be sealed. The holding means E holds the rope 1 in a tensioned state to the extent that it does not loosen outside the entrance/exit of the container A, and then the sealing mechanism B is operated to seal the rope 1 as shown in FIG. 7b, While maintaining this state, operate the pressure reducing means 1 (to reduce the pressure inside the container A to create a vacuum), then operate the high pressure steam supply means 1 to supply high pressure steam to the inside of the container A. Then, the sealing mechanism B is operated in reverse to release the seal on the rope as shown in FIG. The untreated rope 1 is moved into the container A and taken out from the container A and wound up by the winding means, and the untreated rope 1 is carried into the container A until it reaches a predetermined length by the sub-length mechanism F, and the detection signal is transmitted to the motor 5 and the winding device. It is transmitted to the gripping means J to stop the movement of the rope.

The rope is heat-treated by repeating such operations. Here, when moving the rope 1 intermittently, there will be overlapped parts of the steam heat cellar 1-, but even if the rope, which has been set at - degrees, is re-heated at the same temperature, the properties of the rope will not be affected. Can be set evenly.

In the embodiment of the present invention, two sets of devices constituting rope holding means, fixed length intermittent transfer means, etc. are shared in one pressure vessel. The present invention is not limited to the number of pressure vessels or the number of sets of devices.

Effect of the invention According to the present invention, the following effects are achieved.

The rope is kept under tension to the extent that it does not loosen, the rope is sealed, and then the pressure is reduced to create a vacuum inside the pressure vessel. High-pressure steam is then applied to heat the rope and heat treat it. Since the air inside can be removed and the high-pressure steam can penetrate into the inside of the rope and heat it, the inside and outside of the rope shrink uniformly through heat treatment. As a result, the rope is no longer tightly tightened due to conventional contraction only on the outside, and the rope can be made flexible. Furthermore, since the vacuum and high-pressure steam are uniformly applied not only to the inside and outside of the rope, but also to the lengthwise direction, the forming is done uniformly and at a high temperature above OO'C, which prevents changes in expansion and contraction over time. We can provide you with high quality rope without any problems.

[Brief explanation of the drawing]

Figure 1 is a schematic two-sided view showing one embodiment of the device according to the present invention, Figure 2 is a schematic side view of Figure 1, and Figure 3 is a view taken along the X and -X arrows in Figure 1. , FIG. 4a is a schematic front view of the length measuring mechanism according to the embodiment of the present invention, FIG. 4b is a partially cutaway schematic side view of FIG. 4a, and FIG. 5 is a schematic cross-sectional side view of the sealing mechanism according to the embodiment of the present invention. , FIG. 6 is a schematic front view of FIG. 5, FIG. 7a is a schematic front view of the rope and bag link with the sealing mechanism not activated, and FIG. 7b is a schematic front view of the rope and bag link with the sealing mechanism activated. A schematic front view of a bank ring. A: Pressure vessel, B: Seal mechanism, C: 10th rope holding mechanism, D = 20th rope holding mechanism, E: Rope holding means, F
: Length measuring mechanism, G: Fixed length intermittent transfer means, H: Decompression means, ■
: high pressure steam supply means, J: winding means, K: pressurizing means,
1 rope, 2: cylinder, 3: leg, 5: motor, 6: multi-wound pulley, 7: shaft, 7a: bearing, 8a, 8b: fixed support, 9: clutch/brake, 10a, 10b:
Pulley, 1] 11.11b = bearing, 12a spring, 12b: adjustment bolt, '13: rotary encoder, 15: automatic valve, 16: vacuum pump, 17: automatic valve, 1
8: High pressure steam source, 19: Automatic valve, 20: 1~lap, 2
1: Bag ring, 21a: Fluid supply port, 22a, 22
b, 22c, 22d: bag casing, 23: high pressure fluid supply source, 24.25: automatic valve, 26 two-winding drum,
26a: Shaft of winding drum, 27:1-lux motor. Patent applicant Ashida Seisakusho Co., Ltd.

Claims (1)

[Claims] A rope made of polyolefin strands is penetrated from the inlet to the outlet in a pressure vessel having a sealable inlet and outlet, and the rope is kept under tension to the extent that it does not loosen outside the inlet and outlet of the container, and then , after sealing the rope and reducing the pressure inside the container to create a vacuum while maintaining that state, high-pressure steam is applied to the inside of the container to heat the rope, and then the seal is released and the rope is heated. The method is characterized in that the rope in the heat-treated portion is moved and carried out from the container, and the untreated rope is carried into the container to stop the movement of the rope, and the movement of the rope and the heat treatment are repeated intermittently. Rope heat treatment method.