Copper bar drawing residual stress eliminating device

Abstract

The utility model relates to the technical field of copper bar processing, in particular to a copper bar drawing residual stress eliminating device which comprises a heating box, a supporting table and a temperature control mechanism. A feeding port is formed in the side wall of the heating box, a sealing door is movably installed at the feeding port, at least three independent temperature control heating areas are arranged in the heating box, and each heating area is provided with an independent temperature sensor and an independent heating element. The heating element comprises infrared radiation heating pipes and an electromagnetic induction heating coil, the infrared radiation heating pipes are uniformly distributed along the top of the heating box, and the electromagnetic induction heating coil surrounds the outer side of the supporting table; the temperature control mechanism comprises a PLC (Programmable Logic Controller) and a man-machine interaction interface; the PLC is electrically connected with the man-machine interaction interface, the temperature sensors of the heating areas and the heating elements respectively; the device is uniform in temperature, efficient, energy-saving and accurate in temperature control.

Description

Technical Field

[0001] This utility model relates to the technical field of copper busbar processing, and in particular to a device for eliminating residual stress in drawn copper busbars. Background Technology

[0002] Copper busbars, also known as copper busbars or copper busbars, are long conductors made of copper with a rectangular or chamfered (rounded) rectangular cross-section. They function to transmit current and connect electrical equipment in circuits, possessing excellent conductivity, high mechanical strength, and corrosion resistance, and are widely used in power systems, electrical equipment, and new energy fields. Drawing is a common forming process for copper busbars. However, during drawing, residual stress inevitably forms inside the copper busbar. This residual stress can cause various problems such as brittle fracture, fatigue failure, and stress corrosion. Currently, the main methods for eliminating residual stress include natural aging, thermal aging, and vibration aging. Thermal aging, which activates the atoms inside the copper busbar through heating and releases residual stress, is suitable for mass production.

[0003] Thermal aging devices typically include a furnace body, a conveying mechanism, and a heating mechanism. Existing heating mechanisms usually use resistance wire heating, which has problems such as uneven temperature distribution, high energy consumption, and low heating efficiency, making it difficult to meet the stress relief requirements of high-precision copper busbars. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a residual stress elimination device for drawn copper busbars that features uniform temperature, high efficiency and energy saving, and precise temperature control.

[0005] This utility model discloses a residual stress relief device for drawn copper busbars, comprising a heating chamber, a support platform, and a temperature control mechanism. The heating chamber has a feed inlet on its side wall, with a movably installed sealing door at the inlet. The heating chamber contains at least three independently temperature-controlled heating zones, each equipped with an independent temperature sensor and heating element. The heating elements include infrared radiation heating tubes and electromagnetic induction heating coils. The infrared radiation heating tubes are evenly distributed along the top of the heating chamber, and the electromagnetic induction heating coils are wrapped around the outside of the support platform. The temperature control mechanism includes a PLC controller and a human-machine interface. The PLC controller is electrically connected to the human-machine interface, the temperature sensors of each heating zone, and the heating elements.

[0006] As a preferred embodiment of this utility model, a forced convection fan is provided on the top of the heating box, and an air guide hood is connected to the fan outlet. The bottom of the air guide hood has evenly distributed air outlet holes, and the air outlet direction is at a 45° angle to the surface of the copper busbar.

[0007] As a preferred embodiment of this utility model, a return air channel is provided at the bottom of the heating box, and a filter screen and auxiliary heating components are installed in the return air channel. The return air channel is connected to the air inlet of the fan.

[0008] As a preferred embodiment of this utility model, the support platform includes several transverse support beams and several longitudinal support beams. The surface of the transverse support beams is provided with high-temperature resistant pads, and the top of the pads is provided with grooves that are adapted to the cross-section of the copper busbar.

[0009] As a preferred embodiment of this utility model, a cooling water channel is provided inside the longitudinal support beam, with an inlet and an outlet connected to both ends of the cooling water channel, and the inlet is connected to an external cooling water source.

[0010] As a preferred embodiment of this utility model, the sealing door adopts a double-layer sealing structure, with the inner layer being a high-temperature resistant heat insulation board and the outer layer being a metal protective board. A vacuum heat insulation layer is provided between the two layers, and a protruding sealing ring is installed on the edge of the sealing door.

[0011] As a preferred embodiment of this utility model, the inner wall of the heating box is provided with a reflective heat insulation coating.

[0012] As a preferred embodiment of this utility model, the temperature control mechanism also includes a remote monitoring module, which is connected to the PLC controller and connected to a mobile terminal via wireless communication.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0014] By setting up at least three independently temperature-controlled heating zones, each equipped with an independent temperature sensor and heating element, the heating temperature can be precisely controlled according to the stress conditions of different parts of the copper busbar, effectively solving the problem of uneven temperature distribution. The heating element adopts a combination of infrared radiation heating tubes and electromagnetic induction heating coils. The infrared radiation heating tubes are evenly distributed along the top of the heating box to achieve rapid surface heating, while the electromagnetic induction heating coils are wrapped around the outside of the support platform to achieve internal heating. The two work together to significantly improve heating efficiency and reduce energy consumption. The forced convection fan at the top of the heating box, in conjunction with the air guide hood, delivers air to the surface of the copper busbar at a 45° angle. The filter screen and auxiliary heating elements in the bottom return air channel form a circulation with the fan, further promoting uniform heat distribution. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 This is a cross-sectional structural schematic diagram of the present invention;

[0017] Figure 3 This is a schematic diagram of the support platform structure of this utility model;

[0018] Figure 4 This is a partial cross-sectional structural diagram of the sealing door of this utility model;

[0019] The attached diagram is labeled as follows: 1. Heating box; 12. Feed inlet; 13. Sealed door; 131. Insulation plate; 132. Protective plate; 133. Vacuum insulation layer; 134. Sealing ring; 14. Heating zone; 15. Temperature sensor; 16. Heating element; 161. Infrared radiation heating tube; 162. Electromagnetic induction heating coil; 17. Fan; 18. Air guide hood; 181. Air outlet; 19. Return air channel; 191. Filter screen; 192. Auxiliary heating element; 2. Support platform; 21. Horizontal support beam; 22. Longitudinal support beam; 23. Pad; 231. Groove; 24. Cooling water channel; 241. Water inlet; 242. Water outlet; 3. Temperature control mechanism. Detailed Implementation

[0020] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0021] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0022] Reference Figures 1-2 This embodiment provides a device for relieving residual stress in drawn copper busbars, comprising a heating box 1, a support platform 2, and a temperature control mechanism 3.

[0023] The heating chamber 1 has a heating cavity inside, and a feed inlet 12 is provided on the side wall of the heating chamber 1 to provide a channel for the copper busbar to enter and exit the heating cavity. A sealing door 13 is movably installed at the feed inlet 12, which can effectively prevent heat loss when closed, ensuring that a relatively closed heating space is formed inside the heating chamber 1, thereby improving heating efficiency. The support platform 2 is set inside the heating chamber 1 to stabilize and support the copper busbar, ensuring that the copper busbar maintains a stable position during the heating process, which is convenient for the heating element 16 to heat it accurately. The heating chamber 1 has at least three independently temperature-controlled heating zones 14. This zoned design allows different zones to be precisely set and maintained at different temperatures according to the stress conditions and process requirements of different parts of the copper busbar, thereby achieving more refined stress relief treatment of the copper busbar. Each heating zone 14 is equipped with an independent temperature sensor 15 and a heating element 16. The temperature sensor 15 can monitor the temperature of its heating zone in real time and feed the data back to the temperature control mechanism 3 so as to adjust the working state of the heating element 16 in a timely manner and ensure precise temperature control.

[0024] Specifically, the heating element 16 includes an infrared radiation heating tube 161 and an electromagnetic induction heating coil 162. The infrared radiation heating tube 161 is evenly distributed along the top of the heating box 1. Its working principle is to emit infrared rays to directly radiate heat to the surface of the copper busbar, causing the surface of the copper busbar to heat up rapidly. Due to its uniform distribution, it can ensure the uniformity of heating of the copper busbar surface and avoid local overheating or undercooling. The electromagnetic induction heating coil 162 is surrounded on the outside of the support platform 2. When current passes through the electromagnetic induction heating coil 162, an alternating magnetic field is generated, which induces current inside the copper busbar, thereby causing the copper busbar to heat up. This internal heating method can penetrate deep into the copper busbar and evenly raise the temperature of the copper busbar from the inside out, effectively eliminating internal residual stress. Through the cooperation of the two heating methods, the copper busbar is heated in an all-round, efficient and uniform manner.

[0025] The temperature control mechanism 3 includes a PLC controller and a human-machine interface. The PLC controller is electrically connected to the human-machine interface, the temperature sensors 15 of each heating zone 14, and the heating elements 16. The human-machine interface can be, but is not limited to, a touch screen, a button, or a voice control type. During operation, the operator can input the required temperature parameters, heating time, and other process data through the human-machine interface. The human-machine interface transmits this process data to the PLC controller. Based on the received data and the real-time temperature information fed back by the temperature sensors 15, the PLC controller precisely controls the working state of the heating elements 16 of each heating zone 14, such as turning them on, off, and adjusting the heating power, thereby achieving intelligent and precise control of the heating process.

[0026] Reference Figure 2 The heating box 1 is equipped with a forced convection fan 17 on the top and a guide shroud 18 to further improve the performance of the device. The fan 17 is installed in the center of the top of the heating box 1 and can generate a stable and strong airflow. The guide shroud 18 is connected to the outlet of the fan 17 and is in the shape of an inverted trapezoid. The bottom is provided with evenly distributed air outlet holes 181 to ensure that the airflow can evenly and densely cover the surface of the copper busbar. At the same time, the air outlet 181 is at a 45° angle to the surface of the copper busbar. This angle setting allows the airflow to act on the copper busbar in an oblique scouring manner. Compared with vertical or parallel air outlet, it can more effectively enhance the heat exchange between the air and the surface of the copper busbar, while avoiding excessive impact force of the airflow on the copper busbar, which would affect its stable placement.

[0027] Furthermore, a return air duct 19 is provided at the bottom of the heating box 1. A filter screen 191 and an auxiliary heating element 192 are installed inside the return air duct 19. The return air duct 19 is connected to the air inlet of the fan 17. The return air duct 19 is a flat rectangular parallelepiped, arranged around the bottom of the heating box 1. Its inlets are evenly distributed along the bottom edge of the heating box 1, and a guide plate is provided at each inlet to guide the air inside the heating box into the return air duct 19 in an orderly manner. The filter screen 191 is detachable to prevent impurities from entering the fan 17 and heating element, avoiding wear and damage to the equipment and ensuring stable operation and service life. The auxiliary heating element 192 can be made of ceramic. Heating elements are evenly installed on the inner wall of the return air channel 19, and their surfaces are covered with fine resistance wires. They can generate heat quickly after being energized. The auxiliary heating element 192 is electrically connected to the PLC controller in the temperature control mechanism 3. The PLC controller adjusts the power of the auxiliary heating element 192 in real time according to the temperature data fed back by the temperature sensor 15 to maintain the stability of the temperature inside the heating box. When the device is running, the forced convection fan 17 draws in the hot air from the heating box 1 and blows it onto the surface of the copper busbar through the air guide shroud 18. After the heat exchange is completed, the air temperature drops. Under the action of the pressure difference, this air enters the return air channel 19 through the inlet at the bottom of the heating box 1. First, the air passes through filter 191, where impurities are intercepted and filtered. Then, the air flows through auxiliary heating element 192, which heats the air according to actual needs, raising the air temperature to a suitable range. Finally, the filtered and heated air returns to the fan 17 through the connecting pipe between the return air channel 19 and the air inlet of the fan 17. After being accelerated again, it is sent into the air guide shroud 18, forming a continuous hot air circulation.

[0028] Reference Figure 3 To ensure stability and safety during the copper busbar heating process, the support platform 2 is composed of several transverse support beams 21 and several longitudinal support beams 22 that are perpendicularly intersected to form a robust grid-like frame structure. High-temperature resistant pads 23 are provided on the surface of the transverse support beams 21. The pads 23 can be made of ceramic material, which has excellent high-temperature resistance and can be used for a long time in the high-temperature environment of the heating chamber 1 without performance degradation. They also have good thermal insulation properties, which can effectively reduce heat transfer between the transverse support beams 21 and the copper busbar, and prevent the support beams from being affected by overheating. The top of the pads 23 has a groove 231 that matches the cross-section of the copper busbar to prevent the copper busbar from shifting or rolling during the heating process due to hot airflow impact, equipment vibration, or other factors. This ensures that the copper busbar is always in the predetermined heating position, allowing the heating element to heat it accurately.

[0029] During copper busbar heating, prolonged high temperatures in the support beam can lead to a decrease in the strength of the support beam material and even deformation, affecting the equipment's accuracy and service life. To address the heat dissipation problem of the support beam under high-temperature conditions, a cooling water channel 24 is installed inside the longitudinal support beam 22. The cooling water channel 24 is connected to an inlet 241 and an outlet 242 at both ends. The inlet 241 is connected to an external cooling water source, and the outlet 242 can be connected to an external return water system. By driving the cooling water from the external cooling water source into the cooling water channel 24 through the inlet 241, the support beam absorbs the heat from the high-temperature environment of the heating box 1 and the thermal radiation from the copper busbar through heat conduction, keeping the temperature of the support beam within a reasonable range, ensuring the performance of the support beam, and thus improving the stability and reliability of the entire support platform 2. The cooling water, after absorbing heat, increases in temperature and flows out from the outlet 242 into the return water system for cooling and can then be recycled.

[0030] Reference Figure 4 The sealing door 13 adopts a double-layer sealing structure. The inner layer is a high-temperature resistant heat insulation board 131, and the outer layer is a metal protective board 132. A vacuum heat insulation layer 133 is set between the two layers, and a protruding sealing ring 134 is installed on the edge of the sealing door 13. When the device is running, the high-temperature resistant heat insulation board 131 and the vacuum heat insulation layer 133 effectively block heat leakage, the outer metal protective board 132 provides reliable physical protection, and the sealing ring 134 at the edge ensures a good sealing effect, reduces heat loss, and maintains a stable temperature environment inside the heating box 1.

[0031] When the heating element 16 is working, part of the heat generated is transferred to the inner wall of the heating chamber 1 in the form of thermal radiation. The traditional inner wall material of the heating chamber 1 absorbs some of the thermal radiation, resulting in heat loss. In order to reduce this heat loss, the inner wall of the heating chamber 1 is provided with a reflective heat insulation coating. Its working principle is based on the efficient reflection and blocking of thermal radiation. After the reflective heat insulation coating is applied, when the thermal radiation reaches the surface of the coating, its components will reflect most of the infrared rays back to the interior space of the heating chamber. Only a small amount of heat is absorbed by the coating. Due to the extremely low thermal conductivity of the coating, the absorbed heat is also difficult to conduct to the outer wall of the heating chamber. Together with the heat insulation structure of the sealing door 13, it forms a double protection, further reducing the heat loss of the entire heating chamber. This allows the interior of the heating chamber 1 to maintain a stable high-temperature environment with less energy consumption, thereby improving energy utilization efficiency.

[0032] The temperature control mechanism 3 also includes a remote monitoring module, which is connected to the PLC controller. The remote monitoring module collects temperature data of each area in the heating chamber 1 through the PLC controller and connects to a mobile terminal via wireless communication. The mobile terminal includes, but is not limited to, mobile phones, tablets, or computers. Users can view temperature changes in real time through the mobile terminal and remotely adjust heating parameters. The PLC controller controls the power output of the heating element 16 according to the instructions, which not only improves the convenience and safety of operation, but also enhances the level of intelligent production management.

[0033] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A device for residual stress relief of drawn copper bars, characterized in that, The heating box (1), support platform (2), and temperature control mechanism (3) are provided. The heating box (1) has a feed inlet (12) on its side wall and a sealing door (13) is movably installed at the feed inlet (12). The heating box (1) has at least three independently temperature-controlled heating zones (14). Each heating zone (14) is equipped with an independent temperature sensor (15) and a heating element (16). The heating element (16) includes an infrared radiation heating tube (161) and an electromagnetic induction heating coil (162). The infrared radiation heating tube (161) is evenly distributed along the top of the heating box (1), and the electromagnetic induction heating coil (162) surrounds the outside of the support platform (2). The temperature control mechanism (3) includes a PLC controller and a human-machine interface. The PLC controller is electrically connected to the human-machine interface, the temperature sensor (15) of each heating zone (14), and the heating element (16).

2. The residual stress relief device for drawing copper bars according to claim 1, characterized in that, The heating box (1) is equipped with a forced convection fan (17) at the top. The fan (17) is connected to a guide hood (18) at the outlet. The guide hood (18) has evenly distributed air outlet holes (181) at the bottom. The air outlet direction is at a 45° angle to the surface of the copper busbar.

3. The residual stress relief device for drawing copper bars of claim 2, wherein, The bottom of the heating box (1) is provided with a return air channel (19), and a filter screen (191) and an auxiliary heating element (192) are installed in the return air channel (19). The return air channel (19) is connected to the air inlet of the fan (17).

4. The residual stress relief device for drawing copper bars of claim 1, wherein, The support platform (2) includes several transverse support beams (21) and several longitudinal support beams (22). The surface of the transverse support beams (21) is provided with high temperature resistant pads (23). The top of the pads (23) is provided with grooves (231) that are adapted to the cross section of the copper busbar.

5. The residual stress relief device for drawing copper bars of claim 4, wherein, The longitudinal support beam (22) is provided with a cooling water channel (24), and the two ends of the cooling water channel (24) are respectively connected to the inlet (241) and the outlet (242). The inlet (241) is connected to an external cooling water source.

6. The residual stress relief apparatus for drawing copper bars of claim 1, wherein, The sealing door (13) adopts a double-layer sealing structure. The inner layer is a high-temperature heat-insulating board (131), and the outer layer is a metal protective board (132). A vacuum heat-insulating layer (133) is provided between the two layers. A protruding sealing ring (134) is installed on the edge of the sealing door (13).

7. The residual stress relief apparatus for drawing copper bars of claim 1, wherein, The inner wall of the heating box (1) is provided with a reflective heat insulation coating.

8. The residual stress relief apparatus for drawing copper bars of claim 1, wherein, The temperature control mechanism (3) also includes a remote monitoring module, which is connected to the PLC controller. The remote monitoring module is connected to a mobile terminal via wireless communication to realize real-time transmission of temperature data and remote operation control.

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