Cooling system for a linear product and method for manufacturing a linear product

Abstract

A cooling system 1 includes a supply unit 2 for supplying liquefied gas, and a cooling unit 3 for indirectly applying cold energy of the liquefied gas supplied from the supply unit 2. The supply unit (2) includes a first liquefied gas pipe (L1) connected to an inlet (34) of the cooling unit (3), a control valve (V1) provided in the first liquefied gas pipe (L1), and a controller (21) that adjusts an opening degree of the control valve (V1) and controls a flow rate of the liquefied gas on the basis of a measured temperature measured by a temperature measuring device (33) provided in the cooling unit (3). The cooling unit 3 includes a cylindrical body 30 having a two-channel structure provided so that liquefied gas is supplied to a space of the two-channel structure, and cools a cooling target while the cooling target moves in an inner hollow portion of the cylindrical body 30.

Description

[Technical field]

[0001] The invention relates to a cooling system for a linear product and a method for manufacturing a linear product. [Background Technology]

[0002] [Related technical description]

[0003] Patent document 1 discloses a method for manufacturing a metal wire for reinforcing a high-pressure hose. In FIG. 1 of Patent document 1, a structure is provided in which a plurality of reinforcing layers 2 and an intermediate layer 3 are coated on the outside of a tubular inner surface layer 1, and an outer surface layer 4 is further coated. The reinforcing layer 2 is wrapped around the steel wire in a braided or spiral manner. It is necessary to cool the inner layer before forming the reinforcing layer 2. Patent document 2 discloses immersing the coated wire in a water bath and cooling it. As described above, in the prior art, it is common practice to cool by immersing in a cold water bath or by blowing cold air through a blower or a refrigerator.

[0004] [Prior art documents]

[0005] [Patent Document 1] JP H 10-166027JP

[0006] [Patent Document 2] JP 2007-80730JP

[0007] However, in the case of cold water cooling, subsequent drying is necessary and the area required for processing also increases. In the case of cold air, cooling is not constant and non-uniformity may occur. In particular, when it is desired to shorten the cooling time, the effect is not good.

[0008] As a cooling method in a continuous production line of linear products, when the cooling temperature is non-uniform, the quality of product processing is unstable and the yield is deteriorated. In addition, the cooling equipment may be complicated or may take time to cool, so in order to increase the processing speed, the cooling equipment requires a large space.

[0009] The present disclosure provides a cooling system that has a smaller installation space than the prior art due to simpler equipment and can shorten the cooling time while suppressing cooling unevenness. The present disclosure also provides a method for manufacturing a linear product using the cooling system. [Summary of the invention]

[0010] The cooling system (1) of the linear product includes:

[0011] a supply unit (2) which supplies liquefied gas; and

[0012] A cooling unit (3) which indirectly utilizes the cold energy of the liquefied gas supplied from the supply unit (2).

[0013] Indirect application means that the liquefied gas is not cooled by direct contact but by providing a small non-contact space.

[0014] The supply unit (2) may include:

[0015] a first liquefied gas pipe (L1) connected to an inlet (34) of the cooling unit (3);

[0016] a control valve (V1) disposed in the first liquefied gas pipe (L1); and

[0017] A first controller (21) adjusts the opening of the control valve (V1) and controls the flow rate of the liquefied gas based on a measured temperature (Tpv) measured by a temperature measuring device (33) provided in the cooling unit (3) and a preset set value (Tsv).

[0018] The supply unit (2) may include:

[0019] a second liquefied gas pipe (L2) bypassing the upstream and downstream sides of the control valve (V1); and

[0020] A gate valve (V2) is arranged in the second liquefied gas pipe (L2).

[0021] The first control unit (21) can control the gate valve (V2) when the liquefied gas is initially introduced or based on a measured temperature (Tpv) measured by a temperature measuring device (33) provided in the cooling unit (3) and a preset initial setting value (Tsv0).

[0022] The supply unit (2) may include:

[0023] A second controller controls the gate valve (V2) when the liquefied gas is initially introduced or based on a measured temperature (Tpv) measured by a temperature measuring device (33) provided in the cooling unit (3) and a preset initial setting value (Tsv0).

[0024] The gate valve (V2) and the control valve (V1) may be configured so that when one valve operates (valve open or closed state, opening control state), the other valve does not operate (completely closed state).

[0025] The first control unit (21) may also function as a second control unit.

[0026] The cooling unit (3) may include:

[0027] A cylindrical body (30) having a double channel structure, the double channel structure being configured so that liquefied gas is supplied to a space of the double channel structure (an inner space of the double channel structure) and a cooling target is cooled while the cooling target moves in an inner hollow portion of the cylindrical body (30).

[0028] The cylindrical body (30) having a dual channel structure may include:

[0029] a first hollow cylindrical portion (31) arranged around the cooling target in a moving state with a predetermined gap (d1);

[0030] a second hollow cylindrical portion (32) arranged around the first cylindrical portion (31) with a predetermined gap (d2);

[0031] a temperature measuring device (33) for measuring the temperature between the first hollow cylindrical portion (31) and the second cylindrical portion (32) or for measuring the temperature inside the second cylindrical portion (32);

[0032] an inlet (34) connected between the first hollow cylindrical portion (31) and the second hollow cylindrical portion (32) and introducing liquefied gas (e.g., liquid nitrogen) supplied from the first liquefied gas pipe (L1); and

[0033] One or more through holes (31a) are provided in the first hollow cylindrical portion (31).

[0034] The temperature measuring unit (13) may be provided, for example, on the longitudinal downstream side, the middle part or the upstream side, or one or more of these temperature measuring units may be provided. The first control unit and the second control unit (21) may control the valves to be controlled (the control valve (V1) and the gate valve (V2)) based on one or more measured temperature data.

[0035] The cylindrical body (30) may include:

[0036] A (non-rotating) stirring unit (37) is stationarily arranged in the double channel structure or between the first hollow cylindrical part (31) and the second hollow cylindrical part (31) to stir the flow of the liquefied gas.

[0037] The stirring unit (37) may be configured as a spiral rod-shaped material or a plate-shaped material between the first hollow cylindrical part (31) and the second hollow cylindrical part (32). At least a portion of the spiral rod-shaped material or a portion of the plate-shaped material may be fixedly or detachably connected to the outer surface of the first hollow cylindrical part (31) and / or the inner surface of the second hollow cylindrical part (32).

[0038] The stirring unit (37) may be configured as one or more rod-shaped materials or plate-shaped materials fixedly or detachably connected to the outer surface of the first hollow cylindrical part (31) and / or the inner surface of the second hollow cylindrical part (32).

[0039] The linear product is, for example, a linear product of a thermosetting resin, and examples thereof include a resin hose having a reinforcement layer, an electric wire cable coated with a resin, and a metal pipe coating material. The object to be cooled may be an intermediate of the linear product.

[0040] A linear product is an elongated product of at least 10 m or longer and may have a circular cross section, a rectangular cross section or a polygonal cross section.

[0041] The liquefied gas includes, for example, liquefied gases of inert gases such as liquid nitrogen, liquid argon, and liquid helium, and liquid air.

[0042] A method for manufacturing a linear product, that is, a method for manufacturing a linear product having a plurality of layers, the method comprising:

[0043] a resin layer forming step (S1) for forming a first intermediate (P1) by forming a resin layer (y1) by extrusion molding a thermoplastic resin; and

[0044] A cooling step (S2) for cooling the first intermediate body (P1) including the resin layer (y1) formed in the resin layer forming step (S1) by the cooling system (1) while conveying the first intermediate body (P1).

[0045] The method may further comprise:

[0046] A reinforcing layer forming step (S3) for forming a reinforcing layer (y2) on the outer surface of the resin layer (y1) of the cooled first intermediate (P1) to form a second intermediate (P2) after the cooling step (S3).

[0047] The inner peripheral surface of the resin layer (y1) may be provided with one or more layers or electric wires. In this case, in the resin layer forming step (S1), the first intermediate (P1) may be formed by extruding a thermoplastic resin to form the resin layer (y1) on the outside (outer surface) of the one or more layers or the outside (outer surface) of the electric wires.

[0048] One or more layers may be formed on the outer surface of the reinforcing layer (y2). In this case, the method may further include a resin layer forming step (S4) for forming a resin layer (y3) on the outside (outer surface) of the reinforcing layer (y2) formed in the reinforcing layer forming step (S3) by extrusion molding a thermoplastic resin to form a third intermediate (P3).

[0049] The method may include a cooling step (S5) for cooling the third intermediate (P3) by the cooling system (1) while conveying the third intermediate (P3) having the resin layer (y3) formed in the resin layer forming step (S4).

[0050] The above cooling system (1) and the method have the following effects.

[0051] (1) The cooling time can be shortened, and cooling can be performed efficiently with a simple cooling system having a small installation space.

[0052] (2) The processing speed of linear products can be increased, cooling unevenness can be reduced, and productivity can be improved. [Drawings]

[0053] Figure 1A is a diagram illustrating an example of a cooling system according to the first embodiment.

[0054] Figure 1B is a diagram showing an example of a cooling unit according to the first embodiment;

[0055] Figure 2 is a graph showing an example of a linear product.

[0056] Figure 3 is a diagram showing an example of an apparatus for manufacturing linear products.

[0057] Figure 4 is a process flow that shows an example of the process of manufacturing a linear product. [Specific implementation method]

[0058] Several embodiments of the present invention are described below. The embodiments described below illustrate examples of the present invention. The present invention is not limited to the following embodiments in any way, and includes various modifications implemented within the scope of not changing the principles of the present invention. It should be noted that not all configurations described below are essential elements of the present invention. Upstream and downstream are set based on the flow direction of the liquefied gas. Upstream and downstream are also set based on the delivery direction of the linear product.

[0059] (Example 1)

[0060] The cooler 1 of the first embodiment will refer to Figure 1A and Figure 1B Description. The cooling system 1 includes a supply unit 2 for supplying liquefied gas, and a cooling unit 3 for indirectly applying cold energy of the liquefied gas supplied from the supply unit 2. In the first embodiment, the liquefied gas is liquid nitrogen LN 2 .

[0061] (Supply Unit)

[0062] The supply unit 2 includes a first liquefied gas pipe L1 , a second liquefied gas pipe L2 , a control valve V1 , a gate valve V2 , and a first controller 21 .

[0063] The first liquefied gas pipe L1 is connected to the inlet 34 of the cooling unit 3. A control valve V1 is provided in the first liquefied gas pipe L1. The second liquefied gas pipe L2 bypasses the upstream and downstream sides of the control valve V1. A gate valve V2 is provided in the second liquefied gas pipe L2.

[0064] The first controller 21 adjusts the opening degree of the control valve V1 based on the measured temperature (Tpv) measured by the temperature measuring device 33 (e.g., a thermometer) provided in the cooling unit 3 and the preset set value (Tsv), and controls the liquid nitrogen LN 2 of traffic.

[0065] In addition, when liquid nitrogen is initially introduced, the first controller 21 controls the gate valve V2 based on the measured temperature (Tpv) measured by the temperature measuring device 33 and a preset initial setting value Tsv0.

[0066] The supply unit 2 may include a cylinder and a storage tank in which liquefied gas is stored. The supply unit 2 may include a safety valve for discharging the atmosphere in the first liquefied gas pipe L1. The supply unit 2 may include a manual valve for finely adjusting the liquid feed amount of the first liquefied gas pipe L1 and the second liquefied gas pipe L2.

[0067] (Cooling unit)

[0068] The cooling unit 3 has a cylindrical body 30 having a double-channel structure, in which liquefied gas is supplied to a space of the double-channel structure, and cools a cooling target while the cooling target moves in an inner hollow portion of the cylindrical body 30. The cylindrical body 30 includes a first hollow cylindrical portion 31, a second hollow cylindrical portion 32, a temperature measuring device 33, an inlet 34, and a stirring unit 37.

[0069] The first hollow cylindrical part 31 is disposed around the linear product or its intermediate (P1) in a moving state with a predetermined gap (d1). The second hollow cylindrical part 32 is disposed around the first hollow cylindrical part 31 with a predetermined gap (d2). Liquid nitrogen flows in the gap (d2).

[0070] The length of the first hollow cylindrical part 31 in the longitudinal direction and the length of the second hollow cylindrical part 32 in the longitudinal direction are set according to the specifications of the linear product and the cooling capacity, and are exemplarily, for example, 1m to 5m. The cross-sectional shape of the inner wall surface of the first hollow cylindrical part 31 is set according to the cross-sectional shape of the linear product or the intermediate (P1). In the first embodiment, the cross-section of the linear product and the intermediate (P1) is circular. Accordingly, the cross-sections of the first hollow cylindrical part 31 and the second hollow cylindrical part 32 are also cylindrical.

[0071] The outer diameter of the intermediate body (P1) The inner diameter of the first hollow cylindrical portion 31 The outer diameter of the first hollow cylindrical portion 31 The inner diameter of the second hollow cylindrical portion 32 and the outer diameter of the second hollow cylindrical portion 32 The size relationship between them is as follows.

[0072]

[0073] The gap d1 and the gap d2 are as follows.

[0074] d1 is, for example, 0.5 mm to 5 mm.

[0075] d2 is, for example, 5 mm to 10 mm.

[0076] The temperature measuring device 33 measures the temperature between the first hollow cylindrical portion 31 and the second hollow cylindrical portion 32 or measures the temperature inside the second hollow cylindrical portion 32. The temperature measuring device 33 is disposed at the downstream side or middle portion of the length of the first hollow cylindrical portion 31 and the second hollow cylindrical portion 32 in the longitudinal direction.

[0077] The inlet 34 is connected between the first cylindrical portion 31 and the second hollow cylindrical portion 32, and introduces liquid nitrogen supplied from the first liquefied gas pipe L1. The first hollow cylindrical portion 31 is provided with one or more through holes 31a. The liquid nitrogen LN flowing between the first hollow cylindrical portion 31 and the second hollow cylindrical portion 32 2 By adding LN 2 The cold energy is applied to the linear product or its intermediate to become nitrogen N 2 . Nitrogen N 2 Pass through the through hole 31a, and then be transported together with the linear product or its intermediate to be released into the atmosphere.

[0078] In this embodiment, both ends of the second hollow cylindrical portion 32 in the longitudinal direction are an annular first wall 351 on the upstream side and an annular second wall 352 on the downstream side, and the annular first wall and the annular second wall block the space S formed between the first hollow cylindrical portion 31 and the second hollow cylindrical portion 32. Liquid nitrogen is introduced into the space S through the inlet 34 provided in the first wall 351 or the second hollow cylindrical portion 32. Nitrogen gas or liquid nitrogen can be led out through the through hole 31a or the outlet provided in the second wall 352 or the second hollow cylindrical portion 32.

[0079] The stirring portion 37 is stationarily provided between the first cylindrical portion 31 and the second hollow cylindrical portion 32. The stirring unit 37 is formed of a spiral rod-shaped material.

[0080] (Equipment for manufacturing linear products)

[0081] Figure 2 An example of a linear product is shown. The linear product represents a resin hose P having a reinforcement line. The resin hose P has a three-layer structure including a resin inner layer y1, a reinforcement layer y2, and a resin outer layer y3.

[0082] Figure 3 An example of a linear product manufacturing device is shown. The first resin extruder 5 molds a resin inner layer y1 to produce an intermediate P1. In the steel wire winding machine 6, a steel wire is wound on the outer surface of the resin inner layer y2 to form a reinforcing layer y2, and the intermediate P2 is formed. The cooling system 1 is arranged between the first resin extruder 5 and the steel wire winding machine 6, and quickly cools and stabilizes the resin inner layer y1. In the second resin extruder 7, a resin outer layer y3 is molded on the outer surface of the reinforcing layer y2 to produce an intermediate P3. Line x indicates the conveying direction of the intermediate and the linear product. The intermediate P3 is then wound onto a reel. Before winding, cooling may be performed by the cooling system 1.

[0083] (Method for manufacturing linear products)

[0084] Figure 4An example of the process of the manufacturing method is shown.

[0085] In the resin inner layer forming step ( S1 ), a thermoplastic resin is extrusion-molded to form a resin inner layer y1 , thereby producing a first intermediate product P1 .

[0086] In the cooling step ( S2 ), the first intermediate body P1 including the resin inner layer y1 formed in the resin layer forming step ( S1 ) is cooled by the cooling system 1 while being conveyed.

[0087] In the cooling preparation stage, the first controller 21 completely closes the control valve V1, completely opens the gate valve V2, and supplies liquefied gas to the cooling unit 3 through the second liquefied gas pipe L2. When the measured temperature (Tpv) becomes the initial setting value (Tsv0), the first controller 21 closes the gate valve V2. After the normal operation starts, the first controller 21 adjusts the opening of the control valve V1 based on the measured temperature (Tpv) measured by the temperature measuring device 33 and the preset setting value (Tsv), and controls the liquid nitrogen LN 2 The initial setting value (Tsv0) and the preset setting value (Tsv) may be the same value or different values. The initial setting value (Tsv0) and the preset setting value (Tsv) may be set by the resin inner layer y1 and the reinforcement layer y2.

[0088] In the reinforcement layer forming step ( S3 ), after the cooling step ( S3 ), a reinforcement layer y2 is formed on the outer surface of the resin inner layer y1 of the first intermediate body P1 , thereby producing a second intermediate body P2 .

[0089] In the resin outer layer forming step ( S4 ), a resin layer y3 is formed on the outer surface of the reinforcing layer y2 by extrusion molding a thermoplastic resin, thereby producing a third intermediate product P3 .

[0090] Further, in the third intermediate P3, the resin outer layer 3 formed in the resin layer forming step (S4) is conveyed while being cooled by a cooling system having the same function as the above-mentioned function of the cooling system 1 used in the cooling step (S2).

[0091] (Example)

[0092] The resin hose is extrusion-molded, and then the resin hose is cooled by the cooling system 1 .

[0093] Outer diameter of resin layer: 18mm

[0094] First hollow cylindrical part 31: length 1.5m, inner diameter 20mm, outer diameter 22mm

[0095] Second hollow cylindrical part 32: length 1.5m, inner diameter 32mm, outer diameter 34mm

[0096] Gap d1: 2.5mm

[0097] Gap d2: 5mm

[0098] Stirring unit: spiral rod with a diameter of 4 mm

[0099] Cooling temperature (preset set value (Tsv)): -30℃

[0100] The solenoid valve is used as a control valve and is controlled within ±1° C. of a preset set value by ON / OFF control.

[0101] During steady-state operation, the supply amount of liquid nitrogen was about 0.06 kg / min.

[0102] (Other embodiments)

[0103] (1) In the cooling preparation stage, the first control unit 21 supplies a large amount of liquid nitrogen to the cooling unit 3 to cool the cooling unit 3 to the initial cooling temperature (Tsv0). After that, the first intermediate P1 can be cooled. After the normal operation starts, the supply amount of liquid nitrogen is adjusted to maintain the predetermined cooling temperature.

[0104] (2) In addition to the first controller, a second controller may be provided. The second controller may control the gate valve V2 when the liquefied gas is initially introduced. The second controller may control the gate valve V2 based on the measured temperature (Tpv) measured by the temperature measuring device 33 and a preset initial setting value (Tsv0). In the cooling preparation stage, the first controller 21 completely closes the control valve V1 to stop supplying liquid nitrogen through the first liquefied gas pipe L1. The second controller completely opens the gate valve V2 and supplies liquid nitrogen to the cooling unit 3 through the second liquefied gas pipe L2. When the measured temperature (Tpv) becomes the initial setting value (Tsv0), the second controller closes the gate valve V2. After starting normal operation, the first controller 21 controls the control valve V1, supplies liquid nitrogen to the cooling unit 3 through the first liquefied gas pipe L1, and adjusts the supply amount of liquid nitrogen to maintain a predetermined cooling temperature.

[0105] (3) Linear products are not limited to resin hoses with reinforcement layers, and the cooling device can be similarly used for resin-coated wires and cables or metal pipe coating materials.

[0106] (4) The stirring unit 37 is not essential. The shape of the stirring unit 37 may also be different from the above-mentioned shape.

[0107] (5) Not limited to the through hole 31a, the cylindrical body 30 may be provided with an outlet for discharging liquid nitrogen or gas into the atmosphere.

[0108] [Explanation of Reference Numerals]

[0109] 1 Cooling system

[0110] 2 Supply Units

[0111] 21 First Controller

[0112] 3 Cooling unit

[0113] 31 first hollow cylindrical portion

[0114] 32 second hollow cylindrical portion

[0115] 33 Temperature measuring device

[0116] 34 Entrance

[0117] 31 Through Holes

[0118] V1 Control Valve

[0119] V2 Gate Valve

Claims

1. A cooling system, comprising: a supply unit that supplies liquefied gas; as well as a cooling unit that indirectly utilizes cold energy of the liquefied gas supplied from the supply unit; Wherein, the supply unit comprises: a first liquefied gas pipe connected to an inlet of the cooling unit; a control valve disposed in the first liquefied gas pipe; and A controller adjusts the opening of the control valve and controls the flow rate of the liquefied gas based on a measured temperature (Tpv) measured by a temperature measuring device provided in the cooling unit and a preset set value (Tsv).

2. The cooling system according to claim 1, wherein: The supply unit further comprises: a second liquefied gas pipe that bypasses the upstream and downstream sides of the control valve; and A gate valve is arranged in the second liquefied gas pipe.

3. The cooling system according to claim 1, wherein: The cooling unit comprises: A cylindrical body having a double channel structure is provided so that the liquefied gas is supplied to a space of the double channel structure and a cooling target is cooled while the cooling target moves in an inner hollow portion of the cylindrical body.

4. The cooling system according to claim 3, wherein: The cylindrical body comprises: a first hollow cylindrical portion arranged around the cooling target in a moving state with a predetermined gap (d1); a second hollow cylindrical portion arranged around the first cylindrical portion with a predetermined gap (d2); a temperature measuring device that measures the temperature between the first hollow cylindrical portion and the second hollow cylindrical portion or measures the temperature inside the second hollow cylindrical portion; an inlet connected between the first hollow cylindrical portion and the second hollow cylindrical portion and introducing the liquefied gas supplied from the first liquefied gas pipe; and One or more through holes are disposed in the first hollow cylindrical portion.

5. The cooling system according to claim 3, wherein: The cylindrical body comprises: A stirring unit stirs the flow of the liquefied gas.

6. A method of manufacturing a linear product having a plurality of layers, the method comprising: a resin layer forming step for forming a first intermediate (P1) by forming a resin layer (y1) by extrusion molding a thermoplastic resin; as well as A cooling step for cooling the first intermediate body (P1) including the resin layer (y1) formed in the resin layer forming step by the cooling system according to any one of claims 1 to 4 while conveying the first intermediate body (P1).

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