Electromagnetic heating device for a wire drawing die
By employing an electromagnetic heating device on the wire drawing machine die head, and utilizing high-temperature cables and frequency converters to achieve internal heating, the problems of unstable temperature, high energy consumption, and poor safety associated with traditional resistance wire heating methods are solved, resulting in a highly efficient, safe, and energy-saving wire drawing machine die head heating effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- INNER MONGOLIA ERDOS ELECTRIC POWER & METALLURGY CO LTD
- Filing Date
- 2025-06-19
- Publication Date
- 2026-06-23
AI Technical Summary
Traditional resistance wire heating in wire drawing machine dies suffers from unstable temperature, high energy consumption, and poor safety, resulting in uneven plastic film thickness, large weight deviation, unstable wires, and the risk of burns, as well as low energy utilization efficiency.
The wire drawing machine die head electromagnetic heating device includes fireproof insulation cotton, high-temperature cable, frequency converter, insulation device and thermocouple. It achieves uniform heating and stable temperature through electromagnetic heating. The high-temperature cable is wound around the outside of the die head to form an electromagnetic coil for internal heating. Combined with the frequency converter, it achieves precise temperature control.
It achieves rapid heating, stable temperature, energy saving and environmental protection, and safety and reliability, improving product quality and production efficiency, reducing maintenance costs and the risk of burns. The thermal efficiency is as high as 90%, the preheating time is shortened by more than 60%, the external temperature is reduced to room temperature, and the hidden dangers of leakage and short circuit are eliminated.
Smart Images
Figure CN224391871U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of production technology in the plastic weaving industry, specifically to an electromagnetic heating device for the die head of a wire drawing machine. Background Technology
[0002] In the plastic weaving industry, the drawing machine die head is a key piece of equipment for producing plastic filaments. Currently, most plastic weaving companies in China use resistance wire wrapping heating for their drawing machine dies. This heating method has several technical drawbacks: First, resistance wire heating is greatly affected by fluctuations in ambient temperature, especially when there are significant changes in ambient temperature, often resulting in uneven thickness of the extruded plastic film. Second, unstable temperature control leads to large deviations in the weight per square meter of the produced packaging bags, unstable filaments, and difficulty in guaranteeing the final product quality. Third, the traditional resistance wire wrapping heating method generates very high external temperatures during operation, easily causing burns to operators and posing a serious safety hazard. Furthermore, this heating method has low energy efficiency, consumes relatively large amounts of electricity, and increases production costs.
[0003] Chinese patent CN205200174U discloses a cooling device for the die head of a wire drawing machine, including a cooling pipe, a liquid storage tank, and a control unit. However, its technical solution is to cool the die head of the wire drawing machine, rather than to raise its temperature.
[0004] Chinese patent CN203401723U discloses a novel electromagnetic heating device for the die head of a blown film machine, including a die head, a heat preservation layer, an insulating layer, an induction coil, a temperature control device, and a frequency converter. However, the structural design of this technical solution is mainly for the blown film process of PE material and is not suitable for the production of PP material filament drawing process for woven bags.
[0005] Therefore, it is necessary to provide a new type of heating device for wire drawing machine dies, which can effectively overcome the shortcomings of traditional resistance wire heating methods and achieve the technical effects of uniform heating, stable temperature, energy saving, environmental protection, safety and reliability, so as to meet the needs of the plastic weaving industry for high-quality and high-efficiency production. Utility Model Content
[0006] The purpose of this utility model is to provide an electromagnetic heating device for wire drawing machine dies that achieves uniform heating, stable temperature, energy saving, environmental protection, safety and reliability.
[0007] To achieve the above objectives, this utility model is implemented through the following technical solution: an electromagnetic heating device for a wire drawing machine die head, comprising a wire drawing machine die head, fireproof insulation cotton, a high-temperature cable, a frequency converter, an insulation device, and a thermocouple;
[0008] The fireproof and heat-insulating cotton is placed outside the drawing machine die head. The high-temperature cable is wound around the outside of the fireproof and heat-insulating cotton in the same direction. The frequency converter is connected to both ends of the high-temperature cable. The insulation device is placed outside the high-temperature cable. The thermocouple is placed on the insulation device.
[0009] Furthermore, the fireproof and heat-insulating cotton is disposed on five sides of the upper part of the drawing machine die head.
[0010] Furthermore, the high-temperature cable is wound with the fireproof and heat-insulating cotton in multiple turns.
[0011] Furthermore, it also includes insulating terminals, which are disposed outside the high-temperature cable located at both ends of the long side of the wire drawing machine die.
[0012] Furthermore, the wire drawing machine die head includes multiple die head blocks, and the connection between the multiple die head blocks is a bolt connection.
[0013] Furthermore, the insulating device includes multiple insulating plates, which are fixedly connected to each other.
[0014] Furthermore, the fixed connection between the multiple insulating plates is a hinge connection.
[0015] Furthermore, the high-temperature cable is a special cable resistant to high temperature and high pressure.
[0016] Furthermore, the heating temperature range of the electromagnetic heating device is 100-500 degrees Celsius.
[0017] Furthermore, the frequency range of the output current of the frequency converter is 10~30kHz.
[0018] Compared with the prior art, the present invention has the following advantages:
[0019] I. This device adopts a structural design that is more suitable for the die head of the wire drawing machine, which effectively solves the technical problems of unstable temperature, high energy consumption and poor safety of the traditional wire drawing machine die head heating method. It achieves the technical effects of rapid heating, stable temperature, energy saving and safety and reliability, and improves the product quality and production efficiency of the wire drawing process of PP material for plastic woven bags.
[0020] II. This device improves upon the traditional resistance wire wrapping heating method for the wire drawing machine die head by replacing it with electromagnetic heating, thus achieving internal heating of the die head. The outer wall of the die head is heated by high-frequency electromagnetic action, and the heat is concentrated inside the die head, achieving a thermal efficiency of over 90%. Under the same conditions, it saves 30%-70% more electricity than resistance coil heating. Furthermore, due to the internal heating method, the molecules within the heating element directly induce magnetic energy to generate heat, reducing the average preheating time by more than 60% compared to resistance coil heating, significantly improving production efficiency.
[0021] Third, this device constructs a safe and reliable heating system by incorporating fireproof insulation cotton, high-temperature cables, insulation devices, and thermocouples on the outside of the wire drawing machine die head. Because the heat is concentrated inside the die head, the surface temperature of the electromagnetic coil formed by the high-temperature cable is slightly higher than room temperature, making it safe to touch; the external temperature is only about 45°C, eliminating the risk of burns associated with traditional heating methods. Simultaneously, the electromagnetic coil, wound with custom-made, special high-temperature and high-pressure resistant cables, possesses excellent insulation properties and does not require direct contact with the outer wall of the wire drawing machine die head, thus avoiding leakage and short-circuit faults.
[0022] IV. This device significantly improves the temperature stability of the wire drawing machine die head. Since the coil itself generates almost no heat, has low thermal resistance and low thermal inertia, the temperature of the inner and outer walls of the wire drawing machine die head is consistent. The die head temperature is no longer significantly affected by fluctuations in the external temperature. Temperature control is accurate in real time, fundamentally solving product quality problems caused by unstable temperature under traditional heating methods, such as inconsistent thickness of plastic film, large deviation in the weight of packaging bags, and unstable wire strength.
[0023] Fifth, the electromagnetic coil formed by the high-temperature cable winding in this device has a lifespan of up to 10 years, requiring virtually no inspection, maintenance, or replacement, thus significantly reducing maintenance costs. Simultaneously, because heat is concentrated inside the die head with almost no external heat dissipation, the ambient temperature is reduced from over 100℃ when using resistance coil heating to room temperature, greatly improving the working environment on the production site, reducing summer ventilation and cooling costs, and increasing the comfort and motivation of production workers. Attached Figure Description
[0024] Figure 1 A schematic diagram of the overall structure of an electromagnetic heating device for a wire drawing machine die head provided by this utility model;
[0025] Figure 2 This utility model provides a schematic diagram of the internal structure of an electromagnetic heating device for a wire drawing machine die head.
[0026] In the picture:
[0027] 1. Wire drawing machine die head; 2. Fireproof and heat-insulating cotton; 3. Bolts; 4. High-temperature cable; 5. Frequency converter controller; 6. Insulating terminal; 7. Insulating device; 8. Hinge; 9. Thermocouple. Detailed Implementation
[0028] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.
[0029] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0030] like Figures 1-2 As shown, this utility model provides an electromagnetic heating device for a wire drawing machine die head, including a wire drawing machine die head 1, fireproof insulation cotton 2, high temperature cable 4, frequency converter 5, insulation device 7, and thermocouple 9.
[0031] Fireproof and heat-insulating cotton 2 is placed outside the drawing machine die head 1. High-temperature cable 4 is wound around the outside of fireproof and heat-insulating cotton 2 in the same direction. Frequency converter 5 is connected to both ends of high-temperature cable 4. Insulation device 7 is placed outside high-temperature cable 4. Thermocouple 9 is placed on insulation device 7.
[0032] According to a specific embodiment of this utility model, fireproof and heat-insulating cotton 2 is disposed on five surfaces on the upper part of the drawing machine die head 1.
[0033] According to a specific embodiment of this utility model, the high-temperature cable 4 is wound with fireproof and heat-insulating cotton 2 in multiple turns.
[0034] According to a specific embodiment of the present invention, it also includes an insulating terminal 6, which is disposed outside the high-temperature cable 4 located at both ends of the long side of the wire drawing die head 1.
[0035] According to a specific embodiment of the present invention, the wire drawing machine die head 1 includes multiple die head blocks, and the multiple die head blocks are connected by bolts 3.
[0036] According to a specific embodiment of the present invention, the insulating device 7 includes a plurality of insulating plates, which are fixedly connected to each other.
[0037] According to a specific embodiment of this utility model, the fixed connection between multiple insulating plates is a hinge 8 connection.
[0038] According to a specific embodiment of this utility model, the high-temperature cable 4 is a special cable resistant to high temperature and high pressure.
[0039] According to a specific embodiment of this utility model, the heating temperature range of the electromagnetic heating device is 100 degrees to 500 degrees.
[0040] According to a specific embodiment of the present invention, the frequency range of the output current of the frequency converter 5 is 10~30KHZ.
[0041] The following description uses specific embodiments to illustrate the point.
[0042] Example 1
[0043] like Figures 1-2 As shown, this embodiment provides an electromagnetic heating device for a wire drawing machine die head, which is applied in the wire drawing production process of the plastic weaving industry. The electromagnetic heating device for the wire drawing machine die head includes a wire drawing machine die head 1, fireproof insulation cotton 2, a high-temperature cable 4, a frequency converter 5, insulating terminals 6, an insulating device 7, and a thermocouple 9.
[0044] The wire drawing machine die head 1 includes two die head blocks, which are fastened together by multiple bolts 3 to form an integral wire drawing machine die head 1 structure. The number of bolts 3 can be adjusted according to the size of the die head; in this embodiment, the number is 10 to ensure sufficient connection strength and sealing.
[0045] Fire-resistant and heat-insulating cotton 2 is installed on the upper five surfaces of the wire drawing machine die head 1, meaning that all surfaces except the bottom surface of the die head 1 are covered with fire-resistant and heat-insulating cotton 2. Fire-resistant and heat-insulating cotton 2 has excellent high-temperature resistance and heat insulation properties, effectively reducing heat loss to the outside and improving heating efficiency. At the same time, fire-resistant and heat-insulating cotton 2 also has fire-resistant properties, enhancing the safety of the device.
[0046] The high-temperature cable 4 is wound sequentially around the outside of the fireproof insulation cotton 2 in the same direction, with multiple turns, and the winding range does not exceed the lower part of the wire drawing machine die head 1. This winding method has been proven through testing to be most suitable for the wire drawing machine die head, ensuring uniform heating, minimizing energy consumption, and offering better adaptability. It is more flexible and convenient in actual use, allowing for the selection of a more suitable winding installation method according to different wire drawing machine dies, thus providing better adaptability. The high-temperature cable 4 is a custom-made, dedicated high-temperature and high-voltage special cable, capable of withstanding temperatures above 500℃, with a service life of up to 10 years, significantly reducing the frequency and cost of maintenance and replacement.
[0047] The two ends of the high-temperature cable 4 are electrically connected to the frequency converter 5, which is used to adjust the electromagnetic field power and control the heating temperature. The frequency converter 5 can output current of different frequencies according to actual needs to achieve precise control of the temperature of the wire drawing machine die head 1. In this embodiment, the output current frequency range of the frequency converter 5 is 10~30KHZ. In actual use, the 380V, 50 / 60HZ three-phase AC power is converted into DC power, and then the DC power is converted into 10~30KHZ power. The converted power is high-frequency, low-voltage, high-current eddy current. The eddy current generates electromagnetic heat to achieve rapid heating of the wire drawing machine die head and quickly reach the temperature required for the operation of the wire drawing machine die head.
[0048] To prevent leakage, insulating terminals 6 are installed on the outside of the left and right sides of the high-temperature cable 4. The insulating terminals 6 can effectively isolate the current and prevent operators from being shocked when they come into contact with these parts.
[0049] An insulation device 7 is installed on the outside of the high-temperature cable 4. The insulation device 7 consists of 5 insulating plates connected together by 6 hinges 8 to form a complete insulation device 7. The insulation device 7 connected by the hinges 8 serves both as insulation protection and as a means of maintenance and repair. Operators can easily check the condition of the internal components by opening the insulating plates connected by the hinges 8.
[0050] Multiple observation holes are provided on the insulating plate. These observation holes are used to observe the condition of the internal components of the device, which facilitates the maintenance and repair of the device.
[0051] It should be noted that, in actual use, the electromagnetic heating device for the wire drawing machine die head in this embodiment heats the die head from the inside out by generating eddy currents from the electromagnetic wires. The surface of the wire drawing machine die head is wrapped with heat insulation cotton. The internal temperature of the wire drawing machine die head reaches 100 to 500 degrees Celsius, but the external temperature of the wire drawing machine die head is only 40 to 50 degrees Celsius. The temperature of the outermost layer and surface of the wire drawing machine die head is only slightly higher than room temperature, which greatly reduces the risk of burns to the operator.
[0052] It should be noted that the connection method for multiple insulating plates in this device can also be a snap-fit connection or a direct forming and fixing connection.
[0053] To monitor the temperature of the wire drawing machine die head 1 in real time, a thermocouple 9 is installed on the left side of the top insulating plate. Thermocouple 9 includes a working end that is in direct contact with the heat source to be measured, a free end, and an instrument panel installed on the side of the free end. The working end of thermocouple 9 passes through the fireproof insulation cotton 2 and is directly connected to the wire drawing machine die head 1, enabling accurate measurement of the internal temperature of the wire drawing machine die head device. Thermocouple 9 is connected to the frequency converter 5 (not shown in the figure) via a wired connection, transmitting the temperature signal to the frequency converter 5. The frequency converter 5 adjusts the electromagnetic field power according to the received temperature signal, so that the temperature of the wire drawing machine die head 1 reaches the temperature required for the production of the wire drawing machine die head.
[0054] The working principle of this invention is as follows: A frequency converter 5 supplies current to a coil formed by winding a high-temperature cable 4. This current, passing through the coil, generates an electromagnetic field. This field acts on the metal wire drawing die head 1, inducing eddy currents within it. These eddy currents generate heat within the die head 1, thus heating it. Since the heat is primarily generated inside the die head, the outer wall temperature is only around 45°C, slightly above room temperature, significantly reducing the risk of burns to operators. Furthermore, because the high-temperature cable 4 itself generates almost no heat, it has an extremely long service life and requires virtually no maintenance.
[0055] In practical applications, the operator first sets the required operating temperature using the frequency converter 5. The frequency converter 5 then automatically adjusts its output power based on the temperature signal fed back by the thermocouple 9, achieving precise control of the temperature of the wire drawing machine die head 1. Once the die head temperature reaches the preset value, the frequency converter 5 automatically adjusts its output power to maintain a constant temperature. Due to the use of internal heating, the heating is uniform, the thermal response is fast, and the temperature fluctuation is small, effectively solving the problem of unstable die head temperature in traditional resistance wire heating methods.
[0056] Compared with the traditional resistance wire-wrapped heating method, this invention has the following significant advantages: First, it has high heating efficiency, with a thermal efficiency of over 90%, saving 30%-70% of electricity compared to the traditional method; second, it has fast heating speed, with preheating time shortened by more than 60% compared to the traditional method; third, it has precise temperature control, low thermal resistance, low thermal inertia, and consistent temperature between the inner and outer walls of the wire drawing machine die; in addition, it has high safety, with low surface temperature, eliminating the risk of burns, and good insulation performance, eliminating the risk of leakage and short circuits; finally, it has a long service life, with the coil generating virtually no heat and a lifespan of up to 10 years, resulting in virtually no maintenance or replacement costs.
[0057] This invention successfully solves a series of problems, such as being greatly affected by external temperature fluctuations, uneven heating, unstable product quality, risk of burns, and high energy consumption, by replacing the traditional resistance wire wrapping heating method with electromagnetic heating. It fundamentally improves the quality and efficiency of wire drawing production in the plastic weaving industry.
[0058] It should be noted that the specifications, number of turns, and winding method of the high-temperature cable 4 described in this utility model can be appropriately adjusted according to actual needs, and the model of the frequency converter 5 can also be matched according to the required temperature. Furthermore, the connection method of the insulation board is not limited to using hinges 8; other methods such as flexible connections or direct forming and fixing can also be used. These changes and modifications are all within the protection scope of this utility model.
[0059] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent transformations or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.
Claims
1. An electromagnetic heating device for a wire drawing machine die head, comprising a wire drawing machine die head, characterized in that: It also includes fireproof insulation cotton, high-temperature cables, frequency converters, insulation devices, and thermocouples; The fireproof and heat-insulating cotton is placed outside the drawing machine die head. The high-temperature cable is wound around the outside of the fireproof and heat-insulating cotton in the same direction. The frequency converter is connected to both ends of the high-temperature cable. The insulation device is placed outside the high-temperature cable. The thermocouple is placed on the insulation device.
2. The electromagnetic heating device for a wire drawing machine die head according to claim 1, characterized in that: The fireproof and heat-insulating cotton is installed on five sides of the upper part of the drawing machine die.
3. The electromagnetic heating device for a wire drawing machine die head according to claim 1, characterized in that: The high-temperature cable is wound with the fireproof and heat-insulating cotton in multiple turns.
4. The electromagnetic heating device for a wire drawing machine die head according to claim 1, characterized in that: It also includes insulating terminals, which are disposed on the outside of the high-temperature cable located at both ends of the long side of the wire drawing machine die.
5. The electromagnetic heating device for a wire drawing machine die head according to claim 1, characterized in that: The wire drawing machine die head includes multiple die head blocks, and the multiple die head blocks are connected by bolts.
6. The electromagnetic heating device for a wire drawing machine die head according to claim 1, characterized in that: The insulation device includes multiple insulating plates, which are fixedly connected to each other.
7. The electromagnetic heating device for a wire drawing machine die head according to claim 6, characterized in that: The multiple insulating boards are fixedly connected by hinges.
8. The electromagnetic heating device for a wire drawing machine die head according to claim 1, characterized in that: The high-temperature cable is a special cable resistant to high temperature and high pressure.
9. The electromagnetic heating device for a wire drawing machine die head according to claim 1, characterized in that: The heating temperature range of the electromagnetic heating device is 100 degrees to 500 degrees.
10. The electromagnetic heating device for a wire drawing machine die head according to claim 1, characterized in that: The frequency range of the output current of the frequency converter is 10~30kHz.