Copper bar annealing device and annealing process

Abstract

The invention provides a copper bar annealing device and an annealing process, and belongs to the technical field of metal material processing. The copper bar annealing device comprises an annealing furnace body, a furnace door, a multi-layer storage rack, an electric heating element, a nitrogen charging mechanism, a nitrogen supplementing mechanism and a controller. The interior of the annealing furnace body is a cuboid hearth working area; the multi-layer storage rack is arranged in the hearth working area, and a gap is formed between the side surface of the multi-layer storage rack and the side wall of the adjacent hearth working area; the main part of the nitrogen charging mechanism is arranged between the bottom in the hearth working area and the suspended bottom below the multi-layer storage rack; the nitrogen supplementing mechanism is arranged in a gap between the side face of the multi-layer storage rack and the side wall of the corresponding hearth working area. The annealing process is implemented based on a copper rod annealing device. According to the invention, the newly supplemented nitrogen is heated by means of heat in the hearth working area, and no additional nitrogen heating equipment is needed, so that the temperature fluctuation after release is reduced, and the influence of the temperature fluctuation on copper bar annealing is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of metal material processing, and in particular to a copper rod annealing device and an annealing process. Background Art

[0002] Copper and copper alloys have high electrical and thermal conductivity, good ductility, and are easy to process. They can be used to manufacture precision instruments, ship parts, etc. At present, the forming process of copper rods includes the following three processes: one is extrusion-rolling-stretching-annealing-finishing-finished product; the second is continuous casting (upward, horizontal or wheeled, crawler, impregnation)-(rolling)-stretching-(annealing)-finishing-finished product; the third is continuous extrusion-stretching-(annealing)-finishing-finished product. For example, the Chinese invention patent application (name: "A production process for copper rods", publication number: CN107185994A, publication date: 2017.09.22) discloses a production process for copper rods, including the following process steps: using high-purity cathode copper as raw material, through upward continuous casting, continuous extrusion, first continuous rolling, annealing, second continuous rolling, drawing and slitting to complete the production of copper rods.

[0003] After the copper rod is stretched (or drawn), stress still remains, and annealing is required to eliminate the stress. In order to prevent oxidation on the surface of the copper rod during the annealing process, an annealing device is further required to provide a vacuum environment or a nitrogen inert protective atmosphere. However, most existing box-type atmosphere annealing furnaces maintain the atmosphere in the furnace by exogenous supplementation, but the newly added nitrogen inert protective gas is easy to cause temperature fluctuations in the furnace due to its low temperature, which may affect the annealing process. Summary of the invention

[0004] The present invention aims to solve the problem that the newly added nitrogen inert protective gas with a lower temperature is prone to cause temperature fluctuations in the annealing atmosphere, and provides a copper rod annealing device and an annealing process. Since the newly added nitrogen is heated by the heat in the working area of ​​the furnace, there is no need to add additional nitrogen heating equipment, thereby reducing the temperature fluctuation after the release and reducing its influence on the annealing of the copper rod.

[0005] The technical solution adopted by the present invention is:

[0006] A copper rod annealing device, comprising:

[0007] The annealing furnace body has a rectangular furnace working area inside and an exhaust port is arranged on the top; a first electric switch valve is arranged on the exhaust port;

[0008] A furnace door, which is combined with the annealing furnace body to seal the furnace working area;

[0009] A multi-layer storage rack, wherein the multi-layer storage rack is arranged in the furnace working area, and a gap is formed between the side surface of the multi-layer storage rack and the adjacent side wall of the furnace working area;

[0010] A plurality of electric heating elements, wherein the plurality of electric heating elements are respectively arranged on the left side and the right side of the multi-layer storage rack;

[0011] A nitrogen charging mechanism, the main part of which is arranged between the bottom of the furnace working area and the suspended bottom below the multi-layer storage rack;

[0012] A nitrogen replenishing mechanism, the nitrogen replenishing mechanism being arranged in a gap between a side surface of the multi-layer storage rack and a corresponding side wall of the furnace working area;

[0013] A controller is electrically connected to the first electric switch valve, the electric heating element, the electric control part of the nitrogen charging mechanism and the electric control part of the nitrogen replenishing mechanism.

[0014] Furthermore, the nitrogen charging mechanism comprises:

[0015] A nitrogen filling pipe, the nitrogen filling pipe is arranged in a first mounting hole provided below the side wall of the annealing furnace body, one end of the nitrogen filling pipe is located outside the annealing furnace body, and is provided with a second electric development valve; the second electric development valve is electrically connected to the controller;

[0016] A serpentine gas distribution pipe is arranged between the bottom of the furnace working area and the suspended bottom below the multi-layer storage rack, and a plurality of through gas distribution holes are opened on its surface; the open end of the serpentine gas distribution pipe is connected to the other end of the nitrogen filling pipe.

[0017] Furthermore, the height of the nitrogen replenishing mechanism is consistent with the height of the furnace working area.

[0018] Furthermore, the nitrogen replenishing mechanism is in the shape of a plate, there are 1 to 3 of them, and they are parallel to the side walls of the corresponding furnace working area.

[0019] Furthermore, the length of the nitrogen replenishing mechanism is 2 / 3 to 4 / 5 of the length of the side wall of the corresponding furnace working area.

[0020] Furthermore, the nitrogen replenishing mechanism comprises:

[0021] A plate-shaped flat plate body, on which a plurality of through columnar slideways are provided along its width direction; a column pin is provided in each columnar slideway for sliding cooperation;

[0022] An upper end cap in the shape of a long strip, which is arranged at the top of the flat plate body; a blind hole corresponding to each of the cylindrical slideways is opened on the upper end cap from the bottom surface of the upper end cap; the diameter of the blind hole is smaller than the diameter of the cylindrical slideway, and an air outlet is opened on the side wall facing the center of the furnace working area;

[0023] A long plate-shaped lower head, wherein a rectangular buffer cavity is provided inside the lower head along its own length direction; a through hole corresponding to each of the cylindrical slideways is provided on the lower head starting from the top surface of the lower head; the diameter of the through hole is smaller than the diameter of the cylindrical slideway and is connected to the buffer cavity;

[0024] A nitrogen replenishing pipe, the nitrogen replenishing pipe is arranged in a second mounting hole opened below the side wall of the annealing furnace body, the closed end of the nitrogen replenishing pipe is located outside the annealing furnace body, and is provided with an electronic pressure sensor, a nitrogen interface and a third electric valve; the other end of the nitrogen replenishing pipe is communicated with the buffer cavity; a rotating shaft is arranged in the nitrogen replenishing pipe along the axial center direction of the nitrogen replenishing pipe; one end of the rotating shaft is located outside the closed end of the nitrogen replenishing pipe, and is provided with a driven gear; the driven gear is meshed with the driving gear of the gear motor; the electronic pressure sensor, the third electric valve and the gear motor are electrically connected to the controller;

[0025] A nitrogen outlet pipe, wherein the nitrogen outlet pipe is arranged on the other side of the lower end cover opposite to the nitrogen replenishing pipe, and the axial centers of the two coincide with each other; a non-complete circular sealing piece is arranged at the connection between the nitrogen outlet pipe and the buffer cavity; the sealing piece is in sliding contact with a non-complete circular barrier piece arranged at the other end of the rotating shaft, and the area of ​​the barrier piece is larger than the area of ​​the remaining gap area at the connection between the nitrogen outlet pipe and the buffer cavity that is not blocked by the sealing piece; a connecting branch pipe that is connected to each other is arranged between the closed end of the nitrogen outlet pipe and the adjacent serpentine gas distribution pipe part.

[0026] Furthermore, the width of the flat plate body is 4 / 5 of the height of the furnace working area.

[0027] Furthermore, the length of the upper head is consistent with the length of the flat plate body, and the thickness thereof is consistent with the thickness of the flat plate body;

[0028] The length of the lower head is consistent with the length of the flat plate body, and the thickness of the lower head is consistent with the thickness of the flat plate body.

[0029] Furthermore, it also includes:

[0030] A gas booster pump is used to increase the pressure of the nitrogen injected into the nitrogen charging mechanism and the nitrogen replenishing mechanism.

[0031] Based on the same inventive concept, the present invention also provides a copper rod annealing process, based on the aforementioned copper rod annealing device, comprising the following steps:

[0032] Step S1, surface treatment is performed on the copper rods to be annealed to remove oil stains and attached impurities, and then the copper rods are scattered and stacked on a multi-layer rack provided in the furnace working area of ​​the annealing furnace body, and the furnace door is closed;

[0033] Step S2, nitrogen is charged into the furnace working area from bottom to top through the nitrogen charging mechanism, and the duration is 20 to 60 minutes;

[0034] Step S3, the electric heating element starts working, so that the temperature in the furnace working area is gradually increased to 500-700°C at 1-10°C / min, and then kept warm for 1-3 hours; at the same time, nitrogen is replenished into the furnace working area by a nitrogen replenishing mechanism provided in the furnace working area to maintain a slightly high pressure in the furnace working area;

[0035] Step S4, the electric heating element stops working, and the copper rod cools down with the furnace until it reaches room temperature; at the same time, the nitrogen replenishing mechanism provided in the furnace working area continues to replenish nitrogen into the furnace working area to maintain a slightly high pressure in the furnace working area.

[0036] The beneficial effects of the present invention are:

[0037] In the present invention, since the newly added nitrogen is heated by the heat in the working area of ​​the furnace, there is no need to add additional nitrogen heating equipment, thereby reducing the temperature fluctuation after release and reducing its impact on the annealing of the copper rod. At the same time, in the present invention, through the cooperation between the barrier sheet and the sealing sheet, the speed of the heated nitrogen released from the combined area of ​​the nitrogen replenishment tube and the buffer cavity can be regulated to further reduce the impact of temperature fluctuations. Finally, when the nitrogen replenishment mechanism in the present invention is provided with 2 or 3, the controller can control the multiple nitrogen replenishment mechanisms to work alternately to meet the demand for continuous nitrogen replenishment. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the embodiments of the present application 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 application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0039] Figure 1 It is a front view of the copper rod annealing device in the embodiment.

[0040] Figure 2 1 is a top view of the copper rod annealing device in the embodiment.

[0041] Figure 3The three-dimensional structure of the copper rod annealing device in the embodiment is shown in FIG. Figure 1 .

[0042] Figure 4 The three-dimensional structure of the copper rod annealing device in the embodiment is shown in FIG. Figure 2 .

[0043] Figure 5 for Figure 1 AA section view.

[0044] Figure 6 for Figure 1 CC section view.

[0045] Figure 7 for Figure 2 Middle BB section view.

[0046] Figure 8 Schematic diagram of the three-dimensional structure of the nitrogen replenishing mechanism in this embodiment.

[0047] Fig. 9 Schematic diagram of the exploded structure of the nitrogen replenishing mechanism in this embodiment.

[0048] The accompanying drawings are as follows:

[0049] 100-annealing furnace body, 200-furnace door, 300-nitrogen charging mechanism, 400-nitrogen replenishing mechanism, 500-gas booster pump.

[0050] 110 - furnace working area, 111 - first mounting hole, 112 - second mounting hole, 120 - multi-layer storage rack, 130 - electric heating element, 140 - exhaust port.

[0051] 310-nitrogen filling pipe, 320-serpentine cloth air pipe.

[0052] 410-flat plate body, 411-cylindrical slide, 420-column pin, 430-upper head, 431-blind hole, 432-air outlet, 440-lower head, 441-buffer cavity, 442-through hole, 450-nitrogen supply pipe, 451-nitrogen interface, 452-rotating shaft, 453-driven gear, 454-barrier plate, 460-nitrogen outlet pipe, 461-sealing plate, 462-connecting branch pipe. DETAILED DESCRIPTION

[0053] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0054] The disclosure below provides many different embodiments or examples to realize different structures of the present invention. In order to simplify the disclosure of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention.

[0055] The embodiments of the invention are described in detail below with reference to the accompanying drawings.

[0056] Example 1

[0057] Figure 1 It is a front view of the copper rod annealing device in the embodiment. Figure 2 1 is a top view of the copper rod annealing device in the embodiment. Figure 3 The three-dimensional structure of the copper rod annealing device in the embodiment is shown in FIG. Figure 1 . Figure 4 The three-dimensional structure of the copper rod annealing device in the embodiment is shown in FIG. Figure 2 . Figure 5 for Figure 1 AA section view. Figure 6 for Figure 1 CC section view. Figure 7 for Figure 2 Middle BB section view. Figures 1 to 7As shown in the figure, the copper rod annealing device includes an annealing furnace body 100 and a furnace door 200. The hollow interior of the annealing furnace body 100 is a rectangular parallelepiped furnace work area 110 with one side open; the furnace work area 110 is the main annealing area of ​​the copper rod, and the furnace door 200 is combined with the annealing furnace body 100 to close the furnace work area 110. A roughly rectangular multi-layer rack 120 is arranged in the furnace work area 110, and there is a gap between the left side, right side and rear side of the multi-layer rack 120 and the left side wall, right side wall and rear side wall of the adjacent furnace work area 110. A plurality of electric heating elements 130 such as electric heating rods are respectively arranged on the left and right sides of the multi-layer rack 120. The temperature in the furnace work area 110 can be adjusted by controlling the current size of the electric heating element 130 by a controller (not shown in the figure). An exhaust port 140 is provided at the top of the annealing furnace body 100, and a first electric switch valve (not shown in the figure) is provided on the exhaust port 140, and the opening of the first electric switch valve can be controlled by the controller. In this embodiment, the copper bars to be annealed are dispersedly stacked on the multi-layer rack 120, the furnace door 200 is closed, and then the controller controls the electric heating element 130 to work, so that the temperature in the furnace working area 110 is gradually increased to 500-700°C at 1-10°C / min, and kept warm for 1-3h, and finally gradually cooled with the furnace to complete annealing and eliminate the residual stress after the copper bar stretching (or drawing) operation.

[0058] In this embodiment, in order to prevent the surface of the copper rod from being oxidized at high temperature during the annealing process, as shown in the attached Figure 6As shown in the figure, the copper rod annealing device also includes a nitrogen filling mechanism 300; the main part of the nitrogen filling mechanism 300 is arranged between the bottom of the furnace working area 110 and the suspended bottom below the multi-layer storage rack 120. The nitrogen filling mechanism 300 includes a nitrogen filling pipe 310 and a serpentine gas distribution pipe 320. The nitrogen filling pipe 310 is arranged in the first mounting hole 111 opened at the lower left of the rear side wall of the annealing furnace body 100; one end of the nitrogen filling pipe 310 is located outside the annealing furnace body 100, and is provided with a second electric development valve (not shown in the figure), and the opening of the second electric valve can be controlled by the controller; the other end of the nitrogen filling pipe 310 is connected to the open end of the serpentine gas distribution pipe 320. The serpentine gas distribution pipe 320 is arranged between the bottom of the furnace working area 110 and the suspended bottom below the multi-layer storage rack 120; at the same time, a number of through gas distribution holes (not shown in the figure) are opened on the surface of the serpentine gas distribution pipe 320. In this embodiment, after the copper rods to be annealed are dispersedly stacked on the multi-layer racks 120 and the furnace door 100 is closed, the controller can control the first electric valve and the second electric valve to be fully opened, and the nitrogen flows along the nitrogen filling pipe 310 and the serpentine gas distribution pipe 320, and then is released from the gas distribution holes, flowing from the lower part to the upper part of the furnace working area 110, and gradually replacing the gas atmosphere in the furnace working area 110 with a nitrogen inert atmosphere. This process lasts for 20 to 60 minutes, and then the programmed heating stage and the insulation stage can be entered.

[0059] In this embodiment, during the copper rod annealing process in the furnace working area 110, air is easily re-introduced into the nitrogen inert gas atmosphere due to factors such as high temperature and difficulty in completely achieving the sealing of the device structure. Therefore, it is necessary to continue to add an appropriate amount of nitrogen to the furnace working area 110 to maintain a slightly high pressure in the furnace working area 110, such as 1.05 standard atmospheric pressure, and when adding nitrogen, it is necessary to avoid the influence of low-temperature nitrogen on the temperature in the furnace working area 110. Therefore, the copper rod annealing device also includes a nitrogen replenishing mechanism 400; the nitrogen replenishing mechanism 400 is roughly plate-shaped, and 1 to 3 are provided; the height of each nitrogen replenishing mechanism 400 is roughly consistent with the height of the furnace working area 110. When there is one nitrogen replenishing mechanism, it is arranged in the gap between the left side, right side or rear side of the multi-layer rack 120 and the left side wall, right side wall or rear side wall of the adjacent furnace working area 110, and is parallel to the side wall of the corresponding furnace working area 110; when there are two nitrogen replenishing mechanisms, they are respectively arranged in the gap between the left side and right side of the multi-layer rack 120 and the left side wall and right side wall of the adjacent furnace working area 110, and are parallel to the side wall of the corresponding furnace working area 110; when there are three nitrogen replenishing mechanisms, they are respectively arranged in the gap between the left side, right side and rear side of the multi-layer rack 120 and the left side wall, right side wall and rear side wall of the adjacent furnace working area 110, and are parallel to the side wall of the corresponding furnace working area 110. Figure 6As shown, a total of three nitrogen replenishing mechanisms 400 are shown; the length of each nitrogen replenishing mechanism 400 is 2 / 3 to 4 / 5 of the length of the side wall of the corresponding furnace working area 110.

[0060] Figure 8 Schematic diagram of the three-dimensional structure of the nitrogen replenishing mechanism in this embodiment. Fig. 9 FIG. 2 is a schematic diagram of the decomposed structure of the nitrogen replenishing mechanism in this embodiment. Figure 8 and Fig. 9As shown, the nitrogen replenishing mechanism 400 includes a plate-shaped flat body 410, which is mainly made of stainless steel. The width of the flat body 410 (i.e., the dimension in the height direction of the furnace working area 110) is 4 / 5 of the height of the furnace working area 110; the length of the flat body 410 is 2 / 3 to 4 / 5 of the length of the side wall of the corresponding furnace working area 110. A plurality of through columnar slideways 411 are provided on the flat body 410 along its width direction. A columnar pin 420 is provided in each columnar slideway 411; the columnar pin 420 is mainly made of stainless steel, which can slide along the columnar slideway 411 and contact and seal with the side wall of the columnar slideway 411. A long plate-shaped upper head 430 is provided at the upper end of the flat body 410. The length of the upper end cap 430 is roughly the same as that of the flat plate body 410, and the thickness of the upper end cap 430 is roughly the same as that of the flat plate body 410; starting from the bottom surface of the upper end cap 430, a blind hole 431 corresponding to each columnar slide 411 is opened on the upper end cap 430 (that is, the axial center of the columnar slide 411 coincides with the axial center of the blind hole 431), and the diameter of the blind hole 431 is smaller than the diameter of the columnar slide 411, so the pin 420 cannot escape from the upper end of the columnar slide 411; a rectangular air outlet 432 is opened on one side of the blind hole 431 facing the center of the furnace working area 110. A long strip-shaped lower end cap 440 is provided at the lower end of the flat plate body 410. The length of the lower head 440 is roughly consistent with the length of the flat body 410, and the thickness of the lower head 440 is roughly consistent with the thickness of the flat body 410; a rectangular buffer cavity 441 is opened inside the lower head 440 along its own length direction; starting from the bottom surface of the lower head 440, a through hole 442 corresponding to each cylindrical slide 411 is opened on the lower head 440, and the diameter of the through hole 442 is smaller than the diameter of the cylindrical slide 411, so the pin 420 cannot escape from the lower end of the cylindrical slide 411; the lower end of the through hole 442 is connected to the buffer cavity 441; a nitrogen replenishing pipe 450 and a nitrogen outlet pipe 460 are respectively arranged on both sides of the thickness direction of the lower head 440, and the axial centers of the two coincide. One end of the nitrogen supply pipe 450 is connected to the lower end cap 440, and the interior thereof is communicated with the buffer cavity 441; the other closed end of the nitrogen supply pipe 450 passes through the second mounting hole 112 opened below the side wall of the corresponding annealing furnace body 100, and extends to the outside of the annealing furnace body 100; at the same time, the nitrogen supply pipe 450 is also provided with an electronic pressure sensor (not shown in the figure), a nitrogen interface 451 and a matching third electric valve (not shown in the figure). The opening of the third electric valve is controlled by the controller, and nitrogen can be filled into the buffer cavity 441 through the nitrogen interface 451 and the nitrogen supply pipe 450.One end of the nitrogen outlet pipe 460 is connected to the lower end cap 440, and the interior thereof is connected to the buffer cavity 441, and a non-complete circular sealing piece 461 is provided at the connection point, so that the nitrogen outlet pipe 460 and the buffer cavity 441 are connected in a non-circular manner; the other end of the nitrogen outlet pipe 460 faces the center of the furnace working area 110, and a connecting branch pipe 462 is provided between the closed end of the nitrogen outlet pipe 460 and the adjacent serpentine gas distribution pipe 320. A rotating shaft 452 is also provided in the nitrogen supplement pipe 450 along its axial center direction. One end of the rotating shaft 452 is located outside the closed end of the nitrogen outlet pipe 460, and is provided with a driven gear 453, which is meshed with the driving gear of the gear motor, and the gear motor is controlled by the controller to drive the rotating shaft 452 to rotate; the other end of the rotating shaft 452 is located near the sealing piece 461, and is provided with a non-complete circular barrier piece 454; the barrier piece 454 is in sliding contact with the sealing piece 461; the area of ​​the barrier piece 454 is larger than the portion of the nitrogen outlet pipe 460 connected to the buffer cavity 441 that is not blocked by the sealing piece 461 The area of ​​the remaining gap region, and as the blocking piece 454 rotates with the rotating shaft 452, the blocking piece 454 gradually covers the remaining gap region at the connection between the nitrogen outlet pipe 460 and the buffer cavity 441 that is not blocked by the sealing piece 461, so that the connection between the nitrogen outlet pipe 460 and the buffer cavity 441 is blocked, and when the blocking piece 454 gradually removes the remaining gap region at the connection between the nitrogen outlet pipe 460 and the buffer cavity 441 that is not blocked by the sealing piece 461, the connection between the nitrogen outlet pipe 460 and the buffer cavity 441 is re-established.When the copper rod is annealed in the present embodiment, the controller controls the second electric valve to be fully closed, the first electric valve to be slightly opened, the gear motor drives the rotating shaft and the barrier plate 454 to gradually cover the remaining gap area at the connection between the nitrogen outlet pipe 460 and the buffer cavity 441 which is not blocked by the sealing plate 461, so that the connection between the nitrogen outlet pipe 460 and the buffer cavity 441 is blocked, and the gear motor stops running; then the third electric valve is fully opened, and nitrogen is continuously filled into the buffer cavity 441 through the nitrogen interface 451 and the nitrogen replenishing pipe 450, and the column pin 420 is gradually pushed to the vicinity of the upper end of the column slide 411. In this process, the nitrogen is gradually heated in the combined area of ​​the nitrogen replenishing pipe 450 and the buffer cavity 441 due to the heat radiation in the furnace working area 110; when the electronic pressure sensor monitors the pressure in the combined area of ​​the nitrogen replenishing pipe 450 and the buffer cavity 441 After rising to the preset pressure, the third electric valve is fully closed, and the gear motor drives the rotating shaft and the barrier plate 454 to gradually remove the remaining gap area at the connection between the nitrogen outlet pipe 460 and the buffer cavity 441 that is not blocked by the sealing plate 461, so that after the connection between the nitrogen outlet pipe 460 and the buffer cavity 441 is re-established, the gear motor stops running; the heated nitrogen in the combined area of ​​the nitrogen replenishment pipe 450 and the buffer cavity 441 enters the serpentine gas distribution pipe 320 through the nitrogen outlet pipe 460 and the connecting branch pipe 462, and then is released to maintain a slightly positive pressure nitrogen inert atmosphere. In this process, the column pin 420 gradually falls back to the vicinity of the lower end of the column slide 411 due to its own gravity, and promotes the heated nitrogen in the combined area of ​​the nitrogen replenishment pipe 450 and the buffer cavity 441 to enter the serpentine gas distribution pipe 320 through the nitrogen outlet pipe 460 and the connecting branch pipe 462; and this cycle is repeated.

[0061] In this embodiment, since the newly added nitrogen is heated by the heat in the furnace working area 110, there is no need to add additional nitrogen heating equipment, thereby reducing the temperature fluctuation after release and reducing its impact on the annealing of the copper rod. At the same time, in this embodiment, through the cooperation between the barrier sheet 454 and the sealing sheet 461, the speed of the heated nitrogen released from the combined area of ​​the nitrogen replenishment tube 450 and the buffer cavity 441 can be regulated to further reduce the impact of temperature fluctuations. Finally, when there are 2 or 3 nitrogen replenishment mechanisms 400 in this embodiment, the controller can control the multiple nitrogen replenishment mechanisms 400 to work alternately. For example, only one nitrogen replenishment mechanism 400 is releasing the supplementary nitrogen at the same time, and the nitrogen temporarily stored in the remaining one or two nitrogen replenishment mechanisms 400 is on standby while the nitrogen temperature gradually increases to meet the demand for continuous nitrogen replenishment.

[0062] In this embodiment, in order to increase the speed of filling nitrogen into the nitrogen replenishing mechanism 400, a gas booster pump 500 may be provided on the connecting pipeline between the nitrogen replenishing mechanism 400 and the nitrogen storage tank. If there are two or three nitrogen replenishing mechanisms 400, one gas booster pump 500 may be shared.

[0063] Example 2

[0064] This embodiment provides a copper rod annealing process, which is implemented based on the copper rod annealing device in Example 1. The process of the copper rod annealing process is as follows:

[0065] Step S1, surface treatment is performed on the copper rods to be annealed to remove oil stains and attached impurities, and then the copper rods are scattered and stacked on the multi-layer racks 120 provided in the furnace working area 110 of the annealing furnace body 100, and the furnace door is closed;

[0066] Step S2, nitrogen is charged into the furnace working area 110 through the nitrogen charging pipe 310 and the serpentine gas distribution pipe 320, flowing from bottom to top, for a duration of 20 to 60 minutes;

[0067] Step S3, the electric heating element 130 starts working, so that the temperature in the furnace working area 110 is gradually increased to 500-700°C at 1-10°C / min, and then kept warm for 1-3 hours; at the same time, the nitrogen replenishing mechanism 400 provided in the furnace working area 110 replenishes nitrogen into the furnace working area 110 to maintain a slightly high pressure in the furnace working area 110;

[0068] In step S4, the electric heating element 130 stops working, and the copper rod cools down with the furnace until it reaches room temperature; at the same time, the nitrogen replenishing mechanism 400 provided in the furnace working area 110 continues to replenish nitrogen into the furnace working area 110 to maintain a slightly high pressure in the furnace working area 110. If there are three nitrogen replenishing mechanisms 400 at the same time, the three nitrogen replenishing mechanisms 400 replenish nitrogen into the furnace working area 110 in sequence.

[0069] The copper rod annealing process in this embodiment can effectively eliminate the residual stress of the copper rod after the stretching (or drawing) operation; at the same time, in this embodiment, nitrogen is continuously added to the furnace working area 110 through the nitrogen replenishing mechanism 400 to maintain a slightly high pressure in the furnace working area 110, which can effectively prevent the high-temperature oxidation of the surface of the copper rod during the annealing process.

Claims

1. A copper rod annealing device, characterized in that: include: The annealing furnace body has a rectangular furnace working area inside and an exhaust port is arranged on the top; The exhaust port is provided with a first electric switch valve; A furnace door, which is combined with the annealing furnace body to seal the furnace working area; A multi-layer storage rack, wherein the multi-layer storage rack is arranged in the furnace working area, and a gap is formed between the side surface of the multi-layer storage rack and the adjacent side wall of the furnace working area; A plurality of electric heating elements, wherein the plurality of electric heating elements are respectively arranged on the left side and the right side of the multi-layer storage rack; A nitrogen charging mechanism, the main part of which is arranged between the bottom of the furnace working area and the suspended bottom below the multi-layer storage rack; A nitrogen replenishing mechanism, the nitrogen replenishing mechanism being arranged in a gap between a side surface of the multi-layer storage rack and a corresponding side wall of the furnace working area; A controller is electrically connected to the first electric switch valve, the electric heating element, the electric control part of the nitrogen charging mechanism and the electric control part of the nitrogen replenishing mechanism.

2. The copper rod annealing device according to claim 1, characterized in that: The nitrogen charging mechanism comprises: A nitrogen filling pipe, the nitrogen filling pipe is arranged in a first mounting hole provided below the side wall of the annealing furnace body, one end of the nitrogen filling pipe is located outside the annealing furnace body, and is provided with a second electric development valve; the second electric development valve is electrically connected to the controller; A serpentine gas distribution pipe is arranged between the bottom of the furnace working area and the suspended bottom below the multi-layer storage rack, and a plurality of through gas distribution holes are opened on its surface; the open end of the serpentine gas distribution pipe is connected to the other end of the nitrogen filling pipe.

3. The copper rod annealing device according to claim 2, characterized in that: The height of the nitrogen replenishing mechanism is consistent with the height of the furnace working area.

4. The copper rod annealing device according to claim 2, characterized in that: The nitrogen replenishing mechanism is plate-shaped, with 1 to 3 of them, and is parallel to the side wall of the corresponding furnace working area.

5. The copper rod annealing device according to claim 4, characterized in that: The length of the nitrogen replenishing mechanism is 2 / 3 to 4 / 5 of the length of the side wall of the corresponding furnace working area.

6. The copper rod annealing device according to any one of claims 2 to 5, characterized in that: The nitrogen supplementation mechanism comprises: A plate-shaped flat plate body, on which a plurality of through columnar slideways are provided along its width direction; a column pin is provided in each columnar slideway for sliding cooperation; An upper end cap in the shape of a long strip, which is arranged at the top of the flat plate body; a blind hole corresponding to each of the cylindrical slideways is opened on the upper end cap from the bottom surface of the upper end cap; the diameter of the blind hole is smaller than the diameter of the cylindrical slideway, and an air outlet is opened on the side wall facing the center of the furnace working area; A long plate-shaped lower head, wherein a rectangular buffer cavity is provided inside the lower head along its own length direction; a through hole corresponding to each of the cylindrical slideways is provided on the lower head starting from the top surface of the lower head; the diameter of the through hole is smaller than the diameter of the cylindrical slideway and is connected to the buffer cavity; A nitrogen replenishing pipe, the nitrogen replenishing pipe is arranged in a second mounting hole opened below the side wall of the annealing furnace body, the closed end of the nitrogen replenishing pipe is located outside the annealing furnace body, and is provided with an electronic pressure sensor, a nitrogen interface and a third electric valve; the other end of the nitrogen replenishing pipe is communicated with the buffer cavity; a rotating shaft is arranged in the nitrogen replenishing pipe along the axial center direction of the nitrogen replenishing pipe; one end of the rotating shaft is located outside the closed end of the nitrogen replenishing pipe, and is provided with a driven gear; the driven gear is meshed with the driving gear of the gear motor; the electronic pressure sensor, the third electric valve and the gear motor are electrically connected to the controller; A nitrogen outlet pipe, wherein the nitrogen outlet pipe is arranged on the other side of the lower end cover opposite to the nitrogen replenishing pipe, and the axial centers of the two coincide with each other; a non-complete circular sealing piece is arranged at the connection between the nitrogen outlet pipe and the buffer cavity; the sealing piece is in sliding contact with a non-complete circular barrier piece arranged at the other end of the rotating shaft, and the area of ​​the barrier piece is larger than the area of ​​the remaining gap area at the connection between the nitrogen outlet pipe and the buffer cavity that is not blocked by the sealing piece; a connecting branch pipe that is connected to each other is arranged between the closed end of the nitrogen outlet pipe and the adjacent serpentine gas distribution pipe part.

7. The copper rod annealing device according to claim 6, characterized in that: The width of the flat plate body is 4 / 5 of the height of the furnace working area.

8. The copper rod annealing device according to claim 7, characterized in that: The length of the upper head is consistent with the length of the flat plate body, and the thickness of the upper head is consistent with the thickness of the flat plate body; The length of the lower head is consistent with the length of the flat plate body, and the thickness of the lower head is consistent with the thickness of the flat plate body.

9. The copper rod annealing device according to any one of claims 1 to 5 and 7, characterized in that: Also includes: A gas booster pump is used to increase the pressure of the nitrogen injected into the nitrogen charging mechanism and the nitrogen replenishing mechanism.

10. A copper rod annealing process, based on the copper rod annealing device according to any one of claims 1 to 9, characterized in that: The following steps are involved: Step S1, surface treatment is performed on the copper rods to be annealed to remove oil stains and attached impurities, and then the copper rods are scattered and stacked on a multi-layer rack provided in the furnace working area of ​​the annealing furnace body, and the furnace door is closed; Step S2, nitrogen is charged into the furnace working area through the nitrogen charging mechanism, flowing from bottom to top, for a duration of 20 to 60 minutes; Step S3, the electric heating element starts working, so that the temperature in the furnace working area is gradually increased to 500-700°C at 1-10°C / min, and then kept warm for 1-3 hours; at the same time, nitrogen is replenished into the furnace working area by a nitrogen replenishing mechanism provided in the furnace working area to maintain a slightly high pressure in the furnace working area; Step S4, the electric heating element stops working, and the copper rod cools down with the furnace until it reaches room temperature; at the same time, the nitrogen replenishing mechanism provided in the furnace working area continues to replenish nitrogen into the furnace working area to maintain a slightly high pressure in the furnace working area.

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