Wire drawing annealing temperature control device

Abstract

The utility model discloses a kind of electric wire wire drawing annealing temperature control devices, including furnace body, several annealing tubes of the furnace body and control box, each the annealing tube is divided into at least three independent temperature control sections along its length direction, including import preheating section, middle high-temperature section and outlet slow cooling section, each the temperature control section is equipped with an independent modular heating unit, the modular heating unit includes the heater for the annealing tube corresponding section separately heating and the temperature sensor for detecting the section temperature, controller and multiple temperature control modules are equipped in the control box, each the temperature control module independently connects the heater and temperature sensor of one modular heating unit. The utility model is by with single furnace tube into three independent temperature control sections, can provide scientific heat treatment process of preheating, constant temperature annealing and slow cooling for wire rod, avoid thermal stress caused by temperature dramatic change, improve wire rod internal organization quality and mechanical property.

Description

TECHNICAL FIELD

[0001] The utility model relates to metal wire rod processing technical field especially a wire drawing annealing temperature control device. BACKGROUND

[0002] In the wire and cable manufacturing industry, the copper wire after drawing needs annealing treatment to eliminate work hardening and restore the toughness and ductility of the wire rod. The currently widely used tubular annealing furnace usually adopts furnace tubes arranged side by side, and one or more centralized heating sources are used to heat the whole row of furnace tubes.

[0003] However, this traditional heating method has obvious defects. First, the furnace tubes located on both sides of the furnace body and the furnace tubes located in the middle have different heat radiation and heat convection conditions, resulting in uneven annealing effect of the wire rods at different positions. Second, the temperature of the whole section of furnace tubes is uniform, the wire rod encounters sharp temperature rise when entering, and sharp cooling when exiting, which is easy to produce thermal stress.

[0004] Therefore, we propose a wire drawing annealing temperature control device to solve the above problems. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a wire drawing annealing temperature control device to solve the problems raised in the background art.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0007] A wire drawing annealing temperature control device, comprising a furnace body, a plurality of annealing tubes penetrating through the furnace body, and a control box. Each annealing tube is divided into at least three independent temperature control sections along its length direction, including an inlet preheating section, a middle high-temperature section, and an outlet slow-cooling section. Each temperature control section is equipped with an independent modular heating unit. The modular heating unit includes a heater for separately heating the corresponding section of the annealing tube and a temperature sensor for detecting the temperature of the section. The control box is provided with a controller and a plurality of temperature control modules. Each temperature control module independently connects the heater and the temperature sensor of one modular heating unit to realize independent temperature control of each temperature control section.

[0008] In further embodiments, the set temperature of the inlet preheating section is lower than that of the middle high-temperature section, and the set temperature of the outlet slow-cooling section is lower than that of the middle high-temperature section.

[0009] In further embodiments, the internal temperature of the inlet preheating section increases steadily from the inlet to the outlet, and the internal temperature of the outlet slow-cooling section decreases steadily from the inlet to the outlet.

[0010] In a further embodiment, the temperature sensor is a K-type thermocouple or an S-type thermocouple.

[0011] In a further embodiment, two temperature sensors are arranged in each temperature control section along the length direction thereof, and are arranged near the inlet and the outlet of the temperature control section, respectively.

[0012] In a further embodiment, each modular heating unit is covered with an independent heat preservation lining, and a heat insulation plate is arranged between adjacent annealing pipes.

[0013] In a further embodiment, the control box is further provided with a touch display screen connected with the controller.

[0014] Compared with the prior art, the utility model has the beneficial effects that:

[0015] The utility model discloses a single furnace tube is divided into three independent temperature control sections, can provide the scientific heat treatment flow of preheating, constant temperature annealing and slow cooling for wire rod, avoids the thermal stress of temperature sharp change, promotes wire rod internal organization quality and mechanical performance, and each furnace tube adopts the same zoning temperature control mode, solves the furnace temperature difference problem of traditional annealing furnace due to the position difference of furnace tube, ensures that all wire rods experience the same annealing process curve. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is the structure schematic diagram of the utility model;

[0017] Figure 2 It is the internal structure schematic diagram of the utility model furnace body;

[0018] Figure 3 It is the installation structure schematic diagram of the utility model annealing pipe and heater and temperature sensor;

[0019] Figure 4 It is the internal partial structure schematic diagram of the utility model furnace body after longitudinal sectioning;

[0020] Figure 5 It is the temperature control system frame diagram of the utility model one annealing pipe.

[0021] In the drawing: 1, furnace body; 2, annealing pipe; 21, import preheating section; 22, middle high temperature section; 23, export slow cooling section; 3, modular heating unit; 31, heater; 32, temperature sensor; 33, heat preservation lining; 34, heat insulation plate; 4, control box; 41, controller; 42, temperature control module; 43, touch display screen. DETAILED DESCRIPTION

[0022] In the description of the utility model, it is necessary to understand that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as a limitation on the utility model. In the description of the utility model, the meaning of "a plurality of" is two or more than two, unless otherwise specified.

[0023] In the description of the utility model, it should be pointed out that, unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For ordinary skilled persons in the art, the specific meaning of the above-mentioned terms in the utility model can be understood through specific circumstances.

[0024] The technical scheme in the embodiments of the utility model will be described clearly and completely in the following with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only a part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary skilled persons in the art without creative labor belong to the scope of protection of the utility model.

[0025] Please refer to Figures 1-4 A wire drawing annealing temperature control device, comprising a furnace body 1, an annealing pipe 2, a modular heating unit 3 and a control box 4.

[0026] The furnace body 1 is the mechanical support and heat preservation shell of the whole device, filled with basic heat preservation materials such as ceramic fiber cotton, and a plurality of annealing pipes 2 are horizontally arranged in the furnace body 1, and the metal wire to be annealed such as copper wire and aluminum wire is continuously passed through the annealing pipes 2.

[0027] Each annealing pipe 2 is divided into three functionally independent temperature control sections along its length direction: an inlet preheating section 21, a middle high-temperature section 22 and an outlet slow cooling section 23, and each temperature control section is equipped with a completely independent modular heating unit 3, which mainly includes:

[0028] Heater 31: In this embodiment, it is preferred to use armored resistance heating bands as the heater 31, which are tightly wound and fixed on the outer surface of the corresponding annealing tube 2 section by high-temperature-resistant stainless steel straps. In order to optimize heat conduction, a heat-conducting gel material can be applied between the heating band and the tube wall. In order to achieve a gradient temperature field, in the inlet preheating section 21, the winding mode of the heating band adopts a variable power density arrangement, that is, the winding spacing is larger near one end close to the inlet, and then the winding spacing gradually increases, and becomes tight winding near the middle high-temperature section 22. This change in density results in a gradual increase in heating power per unit length of the tube, thereby naturally forming a smooth temperature gradient in the section. Similarly, in the outlet slow cooling section 23, the opposite arrangement can be used to achieve a decreasing temperature.

[0029] Temperature sensor 32: In this embodiment, it is preferred to use K-type thermocouples as temperature sensors 32, which are installed in the inlet preheating section 21 and the outlet slow cooling section 23, which need to form a gradient. Two thermocouples are spaced apart in each section. Specifically, one is installed near the entrance of the section, and the other is installed near the exit. For the middle high-temperature section 22, one or two thermocouples can be installed in the middle to ensure temperature uniformity. All thermocouples are inserted into special temperature measuring holes in the wall of the annealing tube 2 to accurately measure the temperature of the wire environment inside the tube.

[0030] Heat insulation layer 33 and heat insulation plate 34: The outside of each modular heating unit 3 is covered with an independent heat insulation layer 33, which is made of high-temperature ceramic fiber modules to ensure that the heat of each zone is highly independent. In addition, between adjacent annealing tubes 2 arranged side by side, a heat insulation plate 34 is provided, which is composed of high-temperature-resistant alloy foil and heat insulation material, effectively blocking the radial heat radiation and heat convection between adjacent furnace tubes, reducing the problem of large temperature difference between the two sides of the furnace tube and the middle furnace tube.

[0031] Please refer to Figure 5 , the control box 4 includes:

[0032] Controller 41: An industrial programmable logic PLC is used as the controller 41, which is responsible for setting the target temperature of each zone and is electrically connected to all temperature control modules 42 to monitor the running state of the entire system.

[0033] Temperature control module 42: In this embodiment, multiple high-performance PID temperature control modules are used as temperature control modules 42, which are installed in the control box 4 together with the controller 41. The input end of each temperature control module 42 is connected to the temperature sensor 32 of a modular heating unit 3 through a wire, and the output end controls the corresponding heater 31. Each temperature control module 42, the heater 31 and the temperature sensor 32 connected thereto form an independent closed-loop control circuit.

[0034] For the inlet preheating section 21, the control system uses the reading of the temperature sensor 32 near the outlet thereof as the main control target to ensure that it reaches a preset temperature lower than the connecting temperature of the middle high-temperature section 22, and the PID algorithm inside the system refers to the reading of the sensor near the inlet to dynamically fine-tune the power distribution of the heater 31 to ensure that a stable and required temperature gradient is formed; for the middle high-temperature section 22, the control system has a clear target, i.e., to quickly reach and accurately stabilize the recrystallization annealing temperature of the material; for the outlet slow-cooling section 23, the control logic is similar to that of the preheating section, but the target is to form a smooth temperature drop gradient to prevent new internal stress of the wire due to rapid cooling.

[0035] Touch display screen 43: The control box 4 further comprises a touch display screen 43 connected with the main controller 41 through Ethernet, and the operator can visually set parameters, start / stop the equipment on the touch display screen 43, and view the current temperature, set temperature, power output and other operating parameters of all annealing pipes 2 and each section in real time.

[0036] Working process: When working, the metal wire passes through the inlet preheating section 21, the middle high-temperature section 22 and the outlet slow-cooling section 23 of each annealing pipe 2 in sequence at a constant speed. In the inlet preheating section 21, the wire is smoothly preheated from room temperature to near the annealing temperature, enters the middle high-temperature section 22 to complete the recrystallization annealing in an accurate constant temperature environment, and finally in the outlet slow-cooling section 23, the temperature is smoothly decreased to a safe discharging temperature.

[0037] Since each annealing pipe 2, or even each section of each pipe, is under independent and accurate closed-loop temperature control, and the heat interference between the pipes is eliminated through physical insulation, the annealing process curves experienced by all wires, regardless of their location in the furnace body 1, are highly consistent, achieving the purpose of improving the uniformity and stability of product quality.

[0038] It is obvious for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be regarded as exemplary and non-limiting, and the scope of the present application is defined by the appended claims rather than the above description, and all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0039] Furthermore, it should be understood that although the specification is described in terms of embodiments, not every embodiment includes every feature described. The specification can include implicit combinations of explicitly mentioned features and / or explicit combinations of implicitely mentioned features. Each embodiment depends on the explicit combinations of features and / or the implicit combinations of features made specifically within that embodiment, and each such embodiment can be combined with every other such embodiment to create further embodiments.

Claims

1. A wire drawing annealing temperature control device, comprising a furnace body (1), a plurality of annealing tubes (2) penetrating the furnace body (1), and a control box (4), characterized in that: Each of the annealing tubes (2) is divided into at least three independent temperature control sections along its length, including an inlet preheating section (21), a middle high-temperature section (22), and an outlet slow cooling section (23). Each of the temperature control sections is equipped with an independent modular heating unit (3). The modular heating unit (3) includes a heater (31) for heating the corresponding section of the annealing tube (2) separately and a temperature sensor (32) for detecting the temperature of the section. The control box (4) is equipped with a controller (41) and multiple temperature control modules (42). Each temperature control module (42) is independently connected to the heater (31) and temperature sensor (32) of a modular heating unit (3) to achieve independent temperature control of each temperature control section.

2. The wire drawing annealing temperature control device according to claim 1, characterized in that: The set temperature of the inlet preheating section (21) is lower than the set temperature of the middle high temperature section (22), and the set temperature of the outlet slow cooling section (23) is lower than the set temperature of the middle high temperature section (22).

3. The wire drawing annealing temperature control device according to claim 2, characterized in that: The internal temperature of the inlet preheating section (21) increases steadily from the inlet to the outlet, and the internal temperature of the outlet slow cooling section (23) decreases steadily from the inlet to the outlet.

4. The wire drawing annealing temperature control device according to claim 1, characterized in that: The temperature sensor (32) is a K-type thermocouple or an S-type thermocouple.

5. The wire drawing annealing temperature control device according to claim 1, characterized in that: Two temperature sensors (32) are spaced apart along the length of each temperature control zone, respectively located near the entrance and the exit of the temperature control zone.

6. The wire drawing annealing temperature control device according to claim 1, characterized in that: Each of the modular heating units (3) is covered with an independent heat insulation lining (33), and a heat insulation plate (34) is provided between adjacent annealing tubes (2).

7. The wire drawing annealing temperature control device according to claim 1, characterized in that: The control box (4) is also equipped with a touch screen (43) connected to the controller (41).

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