Dynamic heating device for moving wire and wire annealing production line

Abstract

The present invention discloses a dynamic heating device for moving wires and a wire annealing production line, wherein the dynamic heating device for moving wires comprises a shell, a metal heat-conducting layer and a heating element. The shell is provided with a fixed cavity; the metal heat-conducting layer is provided in the fixed cavity, the metal heat-conducting layer is in the form of particles, powder or filaments, and the metal heat-conducting layer forms a heating channel for the wires to pass through; the heating element is provided in the fixed cavity or outside the shell, so as to conduct heat to the wires by heating the metal heat-conducting layer. The present invention proposes a dynamic heating device for moving wires, which improves the efficiency of heat exchange on the surface of the wires, realizes the maintenance of heat transfer efficiency and uniformity of heating, and can protect the surface of the wires from high-temperature oxidation due to contact with air, thereby providing a basis for improving the quality of wire coating.

Description

Technical Field

[0001] The invention relates to the technical field of metal wire annealing, and in particular to a moving wire dynamic heating device and a wire annealing production line. Background Art

[0002] When extruding and coating the outer layer of metal wire products such as steel strips, the process is based on the plastic material being plasticized by the extruder and then coated around the required wire in a high-temperature molten state. In this process, the surface temperature of the wire has a great correlation with the subsequent characteristic changes of the molten plastic material that will come into contact with it. At the same time, due to the thermal expansion and contraction of the material, it also has a great correlation with the stability of the subsequent coating size and the interface adhesion of the two layers of material.

[0003] It is generally believed that the surface temperature difference between the molten plastic and the contact wire should be minimized. Of course, different material properties and actual operating process parameters (such as speed, heat capacity of the material, and subsequent cooling methods) will have some impact on the actual effect. Therefore, reliable means are needed to control the surface temperature of the wire before coating. This temperature is higher than normal temperature, ranging from 100 to 300°C. Therefore, it is necessary and a practical need to effectively increase and accurately control the surface temperature of the wire during operation.

[0004] At present, based on the increase in wire temperature and the convenience of operation, the principle of induction heating is basically used to transfer heat to the surface of metal materials and achieve the increase. In addition, infrared temperature measurement is also used on the surface of the wire after heating, and then feedback is given to the system for temperature adjustment and control.

[0005] However, due to the uncertainty of measurement, the difference in the transmission of induced power and the randomness of the production process, the temperature control accuracy of the above temperature control method is low and the temperature control ability is general. Summary of the invention

[0006] The main purpose of the present invention is to provide a moving wire dynamic temperature rising device and a wire annealing production line, aiming to improve the accuracy of temperature control of the moving wire and thus improve the quality of wire-coated products.

[0007] To achieve the above-mentioned object, the present invention proposes a moving wire dynamic heating device, the moving wire dynamic heating device comprising:

[0008] A housing having a fixing cavity;

[0009] A metal heat-conducting layer is disposed in the fixed cavity, the metal heat-conducting layer is in the form of particles, powder or filaments, and the metal heat-conducting layer forms a heating channel for the wire to pass through; and

[0010] A heating element is arranged in the fixed cavity or outside the shell, and is used for conducting heat to the wire by heating the metal heat-conducting layer.

[0011] Optionally, the material of the metal heat-conducting layer is copper, steel, iron or aluminum.

[0012] Optionally, a heat-conducting oil channel is provided in the shell, and the heat-conducting oil channel is at least partially in contact with the metal heat-conducting layer;

[0013] The heating element comprises:

[0014] tank;

[0015] A hot oil pump is disposed outside the housing and is connected to the oil tank; and

[0016] An oil pipe, wherein oil is arranged in the oil pipe, the oil pipe is communicated with the hot oil pump, and the oil pipe is communicated with the heat transfer oil channel.

[0017] Optionally, the temperature of the oil is 200-300°C.

[0018] Optionally, the heating element further comprises a plurality of copper tubes, the plurality of copper tubes are sequentially connected to form a copper tube row, and the copper tube row is abutted against the metal heat conducting layer.

[0019] Optionally, the moving wire dynamic heating device further includes a thermal insulation layer, which is coated on the copper tube row and located between the copper tube row and the inner wall of the shell.

[0020] Optionally, the heating element is an electric heating tube, and the electric heating tube is arranged in the shell.

[0021] Optionally, a gas channel is provided on the shell, the gas channel is connected to the heating channel, and an inert gas is introduced into the gas channel.

[0022] Optionally, the shell is formed with an inlet and an outlet respectively connected to the two ends of the heating channel, and the inlet and the outlet are both provided with a blocking cover, and the blocking cover is provided with a channel for the wire to pass through.

[0023] In order to achieve the above-mentioned purpose, the present invention further proposes a wire annealing production line, comprising the moving wire dynamic heating device as described above, the moving wire dynamic heating device comprising:

[0024] A housing having a fixing cavity;

[0025] A metal heat-conducting layer is disposed in the fixed cavity, the metal heat-conducting layer is in the form of particles, powder or filaments, and the metal heat-conducting layer forms a heating channel for the wire to pass through; and

[0026] A heating element is arranged in the fixed cavity or outside the shell, and is used for conducting heat to the wire by heating the metal heat-conducting layer.

[0027] In the technical solution of the present invention, the dynamic heating device for the moving wire includes a shell, a metal heat-conducting layer and a heating element; the shell is provided with a fixed cavity; the metal heat-conducting layer is arranged in the fixed cavity, the metal heat-conducting layer is in the form of particles, powder or filaments, and the metal heat-conducting layer forms a heating channel for the wire to pass through; the heating element is arranged in the fixed cavity or outside the shell, so as to conduct heat to the wire by heating the metal heat-conducting layer. It can be understood that the metal heat-conducting layer has a large heat capacity and can gather enough heat to maintain the surface heating of the high-speed running wire; and the metal heat-conducting layer is in the form of particles, powder or filaments, which can fully contact the surface of the running wire, improve the efficiency of heat exchange on the surface of the wire, achieve the maintenance of heat transfer efficiency and uniformity of heating, thereby improving the accuracy of temperature control of the moving wire and improving the product quality of the wire coating. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0029] Figure 1 It is a structural schematic diagram of an embodiment of a moving wire dynamic temperature increasing device of the present invention;

[0030] Figure 2 It is a structural schematic diagram of another embodiment of the dynamic temperature increasing device for moving wires of the present invention;

[0031] Figure 3 A schematic radial cross-sectional view of an embodiment of a dynamic temperature increasing device for moving wires of the present invention;

[0032] Figure 4 A schematic radial cross-sectional view of another embodiment of the dynamic temperature increasing device for moving wires of the present invention;

[0033] Figure 5 This is a simplified structural diagram of an embodiment of a wire annealing production line of the present invention.

[0034] Description of Figure Numbers:

[0035] 1. Wire; 100. Dynamic heating device for moving wire; 10. Shell; 20. Metal heat-conducting layer; 30. Heating element; 31. Oil tank; 32. Hot oil pump; 33. Oil pipe; 30a. Heat-conducting oil channel; 34. Copper pipe; 40. Insulation layer; 10a. Fixed cavity; 10b. Gas channel; 10c. Inlet; 10d. Outlet; 11. Sealing cover.

[0036] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0039] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if the meaning of "and / or" appearing in the full text is to include three parallel schemes, taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0040] The present invention provides a dynamic heating device for moving wires, which is suitable for heating wires such as steel strips and copper strips before coating, but is not limited here.

[0041] Reference Figures 1 to 5In one embodiment of the present invention, a moving wire dynamic temperature increasing device 100 comprises a housing 10, a metal heat conducting layer 20 and a heating element 30. The housing 10 is provided with a fixed cavity 10a; the metal heat conducting layer 20 is provided in the fixed cavity 10a, the metal heat conducting layer 20 is in a granular, powdery or filamentous form, and the metal heat conducting layer 20 forms a heating channel for the wire 1 to pass through; the heating element 30 is provided in the fixed cavity 10a or outside the housing 10, and is used to conduct heat to the wire 1 by heating the metal heat conducting layer 20.

[0042] In this embodiment, the housing 10 may be made of a high temperature resistant material, and its specific material, shape, size, etc. are not limited herein.

[0043] The material of the metal heat-conducting layer 20 can be a heat conductor such as copper, steel, iron or aluminum, and can be in the form of small balls, particles, powder or filaments to increase the contact area between the metal heat-conducting layer 20 and the wire 1 .

[0044] The heat source of the heating element 30 may be external induction heating or heat transfer by closed circulation of heat transfer oil, which is not limited here.

[0045] In the technical solution of the present invention, the moving wire dynamic temperature increasing device 100 comprises a housing 10, a metal heat conducting layer 20 and a heating element 30; the housing 10 is provided with a fixed cavity 10a; the metal heat conducting layer 20 is arranged in the fixed cavity 10a, the metal heat conducting layer 20 is in the form of particles, powder or filaments, and the metal heat conducting layer 20 forms a heating channel for the wire 1 to pass through; the heating element 30 is arranged in the fixed cavity 10a or outside the housing 10, and is used to conduct heat to the wire 1 by heating the metal heat conducting layer 20. It can be understood that the metal heat conducting layer 20 has a large heat capacity and can gather enough heat to maintain the surface heating of the high-speed running wire 1; and the metal heat conducting layer 20 is in the form of particles, powder or filaments, and can fully contact the surface of the running wire 1, thereby improving the efficiency of heat exchange on the surface of the wire 1, achieving the maintenance of heat transfer efficiency and uniformity of heating, thereby improving the accuracy of temperature control of the moving wire 1 and improving the product quality of the wire 1 coating.

[0046] It should be noted that the solid carrier nature of the metal heat medium is conducive to the relatively closed treatment of the heat transfer part, and can realize the insulation coating treatment of the main part of the heat transfer, reduce the heat loss, and do a good job in energy conservation and emission reduction. The volume of the carrier of induction heating is expanded, which is conducive to the reduction of the induction frequency, that is, the expansion of the induction depth, to achieve the uniformity of heating, and at the same time reduce the volatility of induction heating. The sealed circulation of heat transfer oil can also be used to achieve safe protection and more environmental friendliness. The heating of the wire 1 is mainly surface conduction. The temperature gradient theoretically decreases from the outside to the inside, and because the transferred heat and temperature change are actually an exponential progressive curve mode that changes with time, in terms of temperature control, as long as the heat capacity (volume or weight) of the metal heat medium and the expected initial temperature setting are sufficiently configured, the temperature of the running wire 1 can be relatively stably controlled and adjusted, which is suitable for occasions where there is no need for large-scale and frequently changing running wire 1 surface temperature.

[0047] Please refer to Figures 2 to 5 In order to further improve the temperature control accuracy of the moving wire dynamic temperature increasing device 100, in one embodiment, a heat conducting oil channel 30a is provided in the housing 10, and the heat conducting oil channel 30a is at least partially in contact with the metal heat conducting layer 20. The heating element 30 may include an oil tank 31, a hot oil pump 32 and an oil pipe 33, wherein the hot oil pump 32 is provided outside the housing 10 and communicated with the oil tank 31; the oil pipe 33 is provided with oil, the oil pipe 33 is communicated with the hot oil pump 32, and the oil pipe 33 is communicated with the heat conducting oil channel 30a.

[0048] It should be noted that the thermal oil channel 30 a and the metal thermal conductive layer 20 may be in indirect contact or in direct contact, which is not specifically limited here.

[0049] Preferably, the temperature of the oil output by the hot oil pump 32 may be 200-300° C., so that the temperature of the wire 1 reaches the target value, thereby achieving a better coating effect.

[0050] In order to improve the uniformity of heat received by the metal heat-conducting layer 20, so that it is heated evenly, and then the wire 1 passing through can be heated evenly, and further improve the temperature control accuracy of the moving wire dynamic heating device 100, in one embodiment, as Figure 1 and Figure 2 As shown, the heating element 30 may further include a plurality of copper tubes 34 , which are connected in sequence to form a copper tube row, and the copper tube row is attached to the metal heat conductive layer 20 .

[0051] In addition, in some other embodiments, tubes made of other metal heat-conducting materials may also be used, which is not specifically limited here.

[0052] Based on the above embodiment, further, Figure 1 and Figure 2As shown, the moving wire dynamic heating device 100 may further include a heat preservation layer 40, which is coated on the copper tube row and is located between the copper tube row and the inner wall of the housing 10. In this way, it is possible to avoid excessive heat loss, improve energy utilization, and further improve the temperature control accuracy of the moving wire dynamic heating device 100.

[0053] It is worth mentioning that the use of metal heat medium can avoid the contamination of the surface of the wire 1 by the heat transfer oil while also facilitating the filling of oxygen-isolating inactive gas (such as nitrogen), protecting the surface of the wire 1 from high-temperature oxidation due to contact with air, thereby providing a basis for improving the quality of wire coating.

[0054] Based on this, in one embodiment, if Figure 2 As shown, a gas channel 10 b is provided on the shell 10 , and the gas channel 10 b is connected to the heating channel. Inert gas such as nitrogen is introduced into the gas channel 10 b to prevent high-temperature oxidation of the surface of the wire 1 .

[0055] Please refer to Figure 2 In one embodiment, the housing 10 is formed with an inlet 10c and an outlet 10d respectively connected to the two ends of the heating channel, and a blocking cover 11 is provided at the inlet 10c and the outlet 10d, and the blocking cover 11 is provided with a channel for the wire 1 to pass through. In this way, heat can be prevented from being dissipated from the inlet and outlet 10d, thereby improving the heat utilization rate of the moving wire dynamic heating device 100.

[0056] Of course, in some other embodiments, the metal heat conductive layer 20 may be heated by electric heating. The heating element 30 may be an electric heating tube, which is disposed in the shell 10 and is attached to the metal heat conductive layer 20 to transfer heat.

[0057] In this embodiment, there may be a plurality of electric heating tubes, and the plurality of electric heating tubes may be evenly distributed on the outer peripheral wall of the metal heat conducting layer 20 or disposed inside the metal heat conducting layer 20 .

[0058] The present invention also proposes a wire annealing production line, referring to Figure 5 The wire annealing production line includes a moving wire dynamic heating device 100. The specific structure of the moving wire dynamic heating device 100 refers to the above embodiment. Since the wire annealing production line proposed in the present invention includes all schemes of all embodiments of the above-mentioned moving wire dynamic heating device 100, it has at least the same technical effects as the moving wire dynamic heating device 100, which are not elaborated here one by one.

[0059] The above descriptions are only optional embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings, or directly / indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A dynamic heating device for moving wire, characterized in that: The moving wire dynamic heating device comprises: A housing having a fixing cavity; a metal heat-conducting layer, disposed in the fixed cavity, the metal heat-conducting layer being in a granular or filamentous form, the metal heat-conducting layer forming a heating channel for the wire to pass through, the material of the metal heat-conducting layer being copper, steel, iron or aluminum; and A heating element is arranged in the fixed cavity or outside the shell, and is used to conduct heat to the wire by heating the metal heat-conducting layer; a heat-conducting oil channel is arranged in the shell, and the heat-conducting oil channel is at least partially in contact with the metal heat-conducting layer; the heating element comprises: tank; A hot oil pump is disposed outside the housing and is connected to the oil tank; and An oil pipe, wherein oil is arranged in the oil pipe, the oil pipe is communicated with the hot oil pump, and the oil pipe is communicated with the heat transfer oil channel.

2. The moving wire dynamic heating device according to claim 1, characterized in that: The temperature of the oil is 200-300°C.

3. The moving wire dynamic heating device according to claim 2, characterized in that: The heating element further comprises a plurality of copper tubes, which are connected in sequence to form a copper tube row, and the copper tube row is abutted against the metal heat-conducting layer.

4. The moving wire dynamic heating device according to claim 3, characterized in that: The moving wire dynamic heating device also includes a heat-insulating layer, which is coated on the copper tube row and is located between the copper tube row and the inner wall of the shell.

5. The moving wire dynamic heating device according to claim 1, characterized in that: The heating element is an electric heating tube, and the electric heating tube is arranged in the shell.

6. The moving wire dynamic heating device according to claim 1, characterized in that: A gas channel is provided on the shell, the gas channel is communicated with the heating channel, and an inert gas is introduced into the gas channel.

7. The moving wire dynamic heating device according to claim 1, characterized in that: The shell is formed with an inlet and an outlet respectively connected to the two ends of the heating channel. The inlet and the outlet are both provided with a blocking cover, and the blocking cover is provided with a channel for the wire to pass through.

8. A wire annealing production line, characterized in that: It comprises the moving wire dynamic heating device as described in any one of claims 1-7.

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