WO2005024110A1

WO2005024110A1 - Rope heat treatment method, heat treatment equipment, and rope

Info

Publication number: WO2005024110A1
Application number: PCT/JP2003/011274
Authority: WO
Inventors: Mitsuo Takagi
Original assignee: Takagi Corporation
Priority date: 2003-09-03
Filing date: 2003-09-03
Publication date: 2005-03-17
Also published as: AU2003261914A1; JPWO2005024110A1; JP3894944B2

Abstract

A rope heat treatment method capable of remarkably raising a heating temperature, capable of remarkably increasing the strength of a rope obtained, capable of being applied not only to general synthetic fiber ropes but also to complex ropes using different types of materials, capable of performing a precise temperature control, and capable of being incorporated in a rope manufacturing machine, and heat treatment equipment, the equipment comprising a steam supply part (B) generating and supplying hot steam, a heat treatment chamber (1) producing hot and humid atmosphere around the rope (R) by the supplied steam, and a rope processing part (10) applying a tension to the rope (R) while sequentially feeding the rope (R) passed through the heat treatment chamber (1), whereby the strength and wear resistance of the rope (R) can be increased particularly on a ultrahigh molecular weight polyethylene rope by the tension applied to the rope (R) in the hot steam atmosphere.

Description

Description Rope heat treatment method, heat treatment equipment and rope

The present invention relates to a rope heat treatment method, a heat treatment facility, and a rope. More specifically, the present invention relates to a method for heat-treating a rope mainly composed of synthetic fibers used in various industrial fields, equipment used for the method, and a rope made by the method. Background art

The process from the fiber yarn to the rope is mainly as follows.

(1) Stranding process for processing raw yarn into yarn, strand, and rope

(2) Resin processing and drying process for strands and twisted ropes

(3) Heat treatment process to prevent the shape of the stay rope

(4) Inspection process for raw materials, processes, products, etc.

Among the above, the performance of difficult-to-produce ropes depends mostly on the performance of the raw material fiber, but the resin processing and drying and heat treatment steps also require (a) uniform rope diameter and length, (mouth) This is an important process in order to increase or decrease the elongation of the rope to some extent, and (8) to make the rope harder to use.

However, it is known that the above heat treatment step may or may not be necessary depending on the type of yarn.

In other words, `` Since nylon ropes and polyester ropes can be restored only by twisting them, heat treatment is necessary to stabilize the twist of the ropes and prevent shape loss.Polyethylene ropes and polypropylene ropes are especially heat-treated. It is common technical knowledge at present (see Non-Patent Document 1).

Now, regarding the above-described heat treatment method, a dielectric heating method and a hot water immersion method have conventionally been used (see Non-Patent Document 2).

The dielectric heating method is a method in which the electric force of a high-frequency electromagnetic field gives rotational vibration to the molecules in the rope, and the heat generated by the friction between adjacent molecules is used to generate heat (J). Reaches 130-150 ° C, and even a thick rope can be heated uniformly both inside and outside. However, although it can be applied to nylon and polyester, it cannot be applied to composite mouths using olefin fibers such as polyethylene or polypropylene with non-polar molecules, steel wire, lead, etc.

In addition, in the equipment of the heat treatment equipment, the matching between the oscillating part and the load (rope) determines the processing capacity, the electrode structure and capacity must be dedicated within the rope size range, and the heat treatment temperature cannot be measured. There are drawbacks such as the inability to perform precise temperature control. In the hot water immersion method, the rope is immersed in a bath of high-temperature water obtained by heating with steam or steam. However, the calorie heat temperature of this method can be less than 100 ° C at the maximum, and only those with low softening point such as polyethylene can be treated.

In addition, the equipment of the heat treatment apparatus has drawbacks such that the apparatus must be immersed (stretched) for the time required for the heat treatment, so that the apparatus becomes large-scale and a drying treatment is required.

[Non-Patent Document 1] Heibonsha Encyclopedia 1 5 1196 pages June 28, 1985 First edition issued Heibonsha

[Non-Patent Document 2] Knowledge of ropes First edition revised August 28, 1993 Tokyo Yunkaichi Kaibu Dept. Co., Ltd. Seizando Shoten Co., Ltd. Disclosure of Invention

In view of the above circumstances, the present invention can dramatically increase the heating temperature and greatly increase the strength of the obtained rope. ゃ It can be applied to not only synthetic fiber ropes in general but also composite ropes using different raw materials. It is an object of the present invention to provide a rope heat treatment technology that can perform the temperature control precisely and can be incorporated into a rope making machine.

The heat treatment method for a rope according to the first invention is characterized in that the rope is tensioned in a high-temperature steam atmosphere.

According to the heat treatment method of the first invention, since the 7K steam can be heated to a high temperature of up to about 1000 ° C., the effect of aligning the rope elements is enhanced, and the rope strength and wear resistance are improved. In addition, it can be applied to not only synthetic fiber ropes in general but also composite ropes using different raw materials. Furthermore, since the temperature of zK steam can be controlled precisely, The temperature can be selected according to the type. In addition, since the atmosphere becomes almost completely oxygen-free, carbonization does not occur.

The rope heat treatment equipment according to the second invention includes a steam supply unit that generates and supplies high-temperature steam, a heat treatment chamber that creates a high-temperature, high-humidity atmosphere around the rope by the supplied steam, and a heat treatment chamber that passes through the heat treatment chamber. And a heat treatment apparatus provided with an orifice processing unit for applying tension while feeding the rope in sequence.

According to the heat treatment equipment of the second invention, in addition to the effects of the first invention, the heat treatment section and the steam supply section can be separated and only the heat treatment section can be incorporated into the steelmaking machine, so that the stranded wire and the heat treatment are integrated. Equipment can be used, and space for manufacturing equipment can be saved.

The rope of the third invention is that the rope made of synthetic fiber obtained by the stranded wire process or the rope obtained by mixing different kinds of raw materials with synthetic fiber is heat-treated by applying tension in a high-temperature steam atmosphere. Features.

The rope of the third invention has an advantage that the strength and wear resistance are greatly improved as a result of reflecting the effects of the first invention.

A rope according to a fourth invention is the rope according to the third invention, wherein the rope is mainly made of polyethylene.

According to the fourth invention, a polyethylene rope having improved tensile strength can be obtained by performing the heat treatment, contrary to the common technical knowledge that does not require the heat treatment. A rope according to a fifth invention is the rope according to the third invention, wherein the rope is mainly made of ultra-high molecular weight polyethylene.

According to the fifth invention, by appropriately selecting the heat treatment temperature, an ultrahigh molecular weight polyethylene rope having significantly improved tensile strength and wear resistance can be obtained. Brief Description of Drawings

FIG. 1 is a principle diagram of the heat treatment method according to the present invention.

FIG. 2 is an explanatory diagram of the heat treatment apparatus A in the heat treatment equipment of the present invention.

FIG. ³ is a circuit diagram of the heat treatment equipment of the present invention.

Figure 4 is an explanatory diagram of the wear test. BEST MODE FOR CARRYING OUT THE INVENTION

Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a principle diagram of a heat treatment method according to the present invention.

Reference numeral 1 denotes a heat treatment chamber, which is a cylindrical member having openings at both ends through which a rope passes. Superheated steam is injected into the heat treatment chamber 1 at normal pressure. 7] The temperature of steam is up to 1000 ° C, but it is usually used up to 500 ° C.

Heat treatment can be performed by passing the rope R through the superheated steam atmosphere in the heat treatment chamber 1 while applying tension.

The rope to which the heat treatment method of the present invention can be applied is generally a synthetic fiber rope. It can also be applied to composite ropes in which different raw materials are combined with synthetic fibers.

Synthetic textile rope materials include nylon, polyester, acrylic, vinylon, polyvinyl chloride, vinylidene, polyurethane, polyclar, benzoate, polyethylene, and polypropylene.

The different types of raw materials that can be combined with synthetic fiber raw materials include metals, lead, and various other materials.

In particular, polyethylene ropes and polypropylene ropes have been conventionally recognized as not requiring heat treatment.However, based on knowledge that contradicts the conventional wisdom of the present invention, by appropriately selecting the heat treatment temperature, However, it has a remarkable effect that tensile strength and frictional resistance can be obtained.

Steam can be heated to a high temperature of about 1000 ° C at normal pressure, and can be heated up to about 500 without difficulty. As the heating is performed at such a high temperature, the external force applied to the rope acts more uniformly on each part in the rope, so that the effect of aligning the rope elements is enhanced and the rope strength is improved. In particular, for polyethylene ropes and polypropylene ropes, heat treatment itself was not conventionally required as described above, but as described in detail in Examples later, an effect of improving tensile strength was observed. For high-molecular-weight polyethylene ropes, improved wear resistance is also observed.

Heating with steam is not limited by material, so it can be applied not only to synthetic fiber ropes in general but also to composite ropes combining different types of raw materials. Furthermore, since the temperature of τΚ steam can be precisely controlled, the optimal heating temperature can be selected according to the type of the yarn. In addition, since the atmosphere is almost completely oxygen-free, there is no accident in which the rope is charcoaled.

FIG. 2 is an explanatory diagram of a heat treatment apparatus in the heat treatment equipment of the present invention.

The main component of the heat treatment apparatus A is a heat treatment chamber 1, which is composed of a cylindrical chamber la and seal fittings 1b attached to both ends thereof. The seal fitting 1b is used to pass the rope R and to make the inside of the champa 1a as airtight as possible. The rope R is put into the chamber 1a through the seal fitting 1b.

A 7_K steam supply pipe 2 is connected to the heat treatment chamber 1, and an on-off valve 3 is interposed in the steam supply pipe 2. The on-off valve 3 is manually operated and used to control the on / off of steam at the beginning and end of the heat treatment.

4 is a force bra for connecting to the key steam supply unit 部 side.

An on-off valve 5 for introducing compressed air is attached to the chamber la. The opening / closing valve 5 is for forcibly cooling the heat treatment chamber 1, and is used, for example, for lowering the chamber temperature during a short stop during the heat treatment operation.

Reference numeral 6 denotes a suction pipe connected to seal fittings lb at two places, which is provided to collect the treated steam and return it to raw water.

10 is a rope processing unit, which is configured as follows.

In the vicinity of the entrance of the heat treatment chamber 1, a capstan roll 11 on the entrance side is placed. This capstan roll 11 is made up of two sheaves 12, 23 and S-force, and has a rope R wound around several times to have a pulling resistance. In addition, a capstan roll 14 on the outlet side is installed near the outlet of the heat treatment chamber 1. This capstan roll 14 is made up of a pair of two sheaves 15 and 16 and has a rope R wound several times to provide resistance to bowing.

The rope R wound around the entrance-side capstan roll 11 is guided by the guide sheave 17 and passed through the heat treatment chamber 1 so that the exiting rope R is wound up by the exit-side capstan roll 14. The take-up amount of the exit side capstan roll 14 is If the number of stan-rolls is greater than 11, it is possible to continuously pass through the rope while applying rope R tension.

Since this device is a compact device composed of a chamber and a capstan door as described above, it can be installed on the exit side of the rope-making machine S. Production efficiency can be increased.

The heat-treated rope R wound around the exit-side capstan roll 14 may be wound around a winding drum 18 installed at an appropriate place, and then sent to the inspection process.

FIG. 3 is a circuit diagram of the heat treatment equipment of the present invention, which is mainly composed of a heat treatment apparatus A and a steam supply section B.

The mechanical configuration of the heat treatment apparatus A is as described above, and the circuit configuration is supplemented as follows.

A suction fan 7 is connected to a suction pipe 6 connected to the heat treatment chamber 1, and the suction fan 7 sucks the processed water vapor in the heat treatment chamber 1. The sucked water vapor may be released as it is, or may be reused as cooling water / supply water.

The heat treatment chamber 1 is provided with a heater 8 using a heating wire. The heater 8 is used for heating when the heat treatment chamber 1 is started, or for keeping the temperature of the supply water so that the steam temperature does not decrease. Reference numeral 9 denotes a thermostat provided in the power supply path of the heater 8.

Next, the steam supply unit B will be described.

21 is a boiler, which heats supplied water to generate steam. The pressure of this water vapor is reduced from about 0.4 MPa to about 0.05 MPa by the pressure reducing valve 22, and is supplied to the header 23. The solenoid valve 24 controls the supply and cutoff of steam to the heater 25. The heater 25 is provided with a high-frequency oscillator 26, which directly heats steam by electromagnetic induction heating to a higher temperature. As a result, superheated steam is obtained. The temperature of the superheated steam reaches a maximum of about 1000 ° C, but it is usually operated at about 500 ° C. This temperature control can be executed precisely by adjusting the output of the high-frequency oscillator 26 or the like.

The caro heater 25 is provided with a cooling pipe 27 through which cooling water passes. This cold The amount of water in the cooling pipe 27 prevents the temperature of the heater 25 from rising above the limit. A steam pipe 29 that sends out superheated steam from the caro heater 25 and sends the superheated steam to the heat treatment chamber 1 is constituted by a pipe or a hose, and is connected to the steam supply pipe 2 through the force bra 4. I'm sorry.

Reference numeral 28 denotes a cooling water pump that supplies water to the cooling pipe 27 and the boiler 21. Cooling water is taken from a water tank (not shown), and the water that has cooled the heater 25 is returned to the water supply tank.

Since the steam supply unit の of the present embodiment has the above-described configuration, the steam supply amount from the poiler 21 and the calorific heat amount of the heater 25 are adjusted to reduce the heating water steam in a wide temperature range. Can be made. For example, the maximum temperature is up to 1000 ° C, but it can be as high as 500 ° C even under normal operating conditions, so it is possible to heat treat various types of materials by applying the optimum temperature range. it can.

Further, since the opening degree of the solenoid valve 24 and the heating temperature of the heater 25 can be finely adjusted, the temperature of the steam supplied to the heat treatment chamber 1 can be precisely controlled. Therefore, the quality control of ropes can be advanced.

Further, since the steam supply section B can be connected to the heat treatment apparatus A by the force bra 4, the steam supply section B can be located at any position away from the heat treatment apparatus A, so that the degree of freedom in equipment layout can be increased. improves. For this reason, as mentioned above, it is possible to install heat treatment equipment A on the exit side of the rope making machine.

Next, as a performance test of the rope obtained by the present invention, a tensile strength and wear resistance test were performed, and the results will be described below.

The ropes subjected to the performance test were a polypropylene rope (Example 1) and an ultra-high molecular weight polyethylene rope (Example 2), and the specifications are shown in Table 1 below. Incidentally, ultra high molecular weight polyethylene is a type of polyethylene, the chemical structure is _{_{(- CH 2 - CH 2 -}} ) n [ molecular weight: 4 million, one CH ₂ of about 3 0 million IU connecting] represented by the density Is 0.97 g / cm ² . For example, there is a product name “Dyneema” manufactured by Toyobo Co., Ltd.

【table 1】 Example Example 1 Example 2 Finish (Material) (Polypropylene) (Ultrahigh molecular weight polyethylene) Rope thickness 1 Zmm 12 mm-like Structure 3000D / 4X 12X3 hit 1600D / 3X9X12 hit No treatment. ■ Processing 115 ° C 〇一

Reason

140 ° C 〇〇

Degree 160 ° C 〇 _____ One "" "" "Processing time m / min 0.75 0.75 Processing tension KN 6 6

In Table 1 above, D means unit denier of fineness, and “hit” indicates the number of strands.

(Tensile test)

Tensile tests were performed on Examples 1 and 2 (Test Examples 1 to 3). The results and average values of Test Examples 1 to 3 are as shown in Table 2 below.

[Table 2]

In Table 2 above, KN is the unit of kilonewton of tensile force.

From the above results, the following can be understood.

(1) Although common to Examples 1 and 2, the heat-treated mouthpiece of the untreated rope has improved tensile strength at any heating temperature. This is thought to be due to the fact that the drawing effect of the twisted yarn was enhanced by the heat drawing.

(2) The polypropylene rope of Example 1 Strength improvement is observed. There is no difference in tensile strength between treatment temperatures.

(3) The rope made of ultra high molecular weight polyethylene of Example 2 is similar to Example 1 in that the tensile strength is improved when heat treatment is performed with respect to no treatment, but the difference between the heat treatment temperatures is also added. Is recognized. That is, the tensile strength is further improved by more than 10% in the case of the treatment at 140 ° C. as compared with the case of the heat treatment temperature of 115 ° C.

(Wear test)

The abrasion test was performed using the abrasion tester shown in FIG. The middle of the rope R is passed over two guide rollers 31 and 32 spaced at a distance of 390 mm. One end of the rope is attached to a disk 33 with a diameter of 550 mm, and one end of the rope is attached to the other end of the rope. 0 kg of heavy jong 34 was attached. A friction surface was installed between the two guide rollers 31 and 32, and the disk 31 was rotated with a motor and reciprocated on the rope R with a stroke of 500 mm.

On the friction surface, two angle members 35, 36 of 4 mm X 5 O mm are arranged, and a sandpaper 37 (No. 80) is placed on the upper surface of one angle member 36, and the rope R is bent. It is made to rub with the edge of the glue wood 35 and sandpaper.

The test procedure is as follows.

The stroke was 500 mm, and reciprocated 8 times per minute. Each time the lip was reciprocated, the sandpaper 37 was moved so that the new surface was in contact with it, and reciprocated 250 times each.

An industrial fan was used to constantly cool the frictional heat generated from the rope R with an industrial fan, and an industrial dryer was used to uniformly dry the contact surface due to humidity. Due to the structure of the test machine, the contact surface of the rope R was brought into contact on the same surface. The above-mentioned abrasion test was performed five times (Test Examples 1 to 5), and the tensile strength after the test (hereinafter referred to as residual strength) was measured for each of Test Examples 1 to 5. The results and average values are shown in Table 3 below.

[Table 3] Example 1 (polypropylene) Example 2 (ultra high molecular weight polyethylene) Untreated 1 15 ° C 160 ° C Untreated 1 15 ° C 140 ° C

KN KN KN KN KN KN

Before friction test 23.7 26.7 27.0 71.7 82.8 92.7 Test example 1 13.0 12.5 12.5 20.0 23.0 37.5 Test example 2 12.5 12.0 13.5 21.0 24.0 35.5 Residual strength test example 3 12.5 13.0 13.0 20.0 23.5 35.5 Test example 4 13.0 13.5 13.5 20.5 23.0 35.0 Test example 5 12.0 13.0 13.0 21.0 24.0 34.5 Average 12.6 12.8 13.1 20.5 23.5 35.6 Survival rate (%) 53.2 47.9 48.5 28.6 28.3 38.4 The above results show that:

(1) In the polypropylene rope of Example 1, there was almost no difference in the residual strength depending on the presence or absence of heat treatment, and the residual ratio (the ratio of the tensile strength after the test to the tensile strength before the test) was 47 to 53. There is no significant difference in%.

(2) The ultra-high molecular weight polyethylene rope of Example 2 showed a 1.1 to 1.2 times improvement in strength with the rope at a heat treatment temperature of 115 ° C compared to the untreated rope. At a treatment temperature of 140 ° C, the residual strength is actually improved by a factor of 1.5 or more. As described above, particularly in the case of ropes made of ultrahigh molecular weight polyethylene, the improvement in wear resistance due to the heat treatment of the present invention is remarkably observed.

It is considered that the reason for this is that the surface of the rope (including resin) melts and the rope surface is hardened by cooling after the rope can be heated to a temperature higher than the melting point of the raw material.

That is, the rope of Example 2 is impregnated with a resin such as polyurethane in the state of the strand and the state of the mouth even in the stranding step. Cutting by rope friction occurs as friction between fibers and leads to cutting.However, because the impregnated resins have different melting points, heat transfer caused by fiber friction occurs. Since the cooling action occurs, the abrasion resistance is improved. In addition, when the heat treatment of the present invention is performed, it is considered that the abrasion resistance is further improved for the above-mentioned reason. Industrial applicability

INDUSTRIAL APPLICABILITY The present invention can be used in a variety of industrial fields such as land and marine applications.

Claims

The scope of the claims

1 A heat treatment method for ropes, in which tension is applied to the ropes in a high-temperature steam atmosphere.

A steam supply unit that generates and supplies high-temperature steam, a heat treatment chamber that creates a high-temperature, high-humidity atmosphere around the rope with the supplied steam, and a rope that applies tension while feeding the rope that is passed through the heat treatment chamber sequentially A rope heat treatment facility comprising a heat treatment device having a treatment section.

3 Rope made by difficult-to-synthesize ropes obtained by the stranded wire process, or ropes obtained by mixing different raw materials with synthetic uru in a high-temperature steam atmosphere under tension and heat-treated.

4. The rope according to claim 3, wherein the rope is mainly composed of polyethylene.

5. The rope according to claim 3, wherein the rope is mainly composed of ultra-high molecular weight polyethylene.