Efficient and energy-saving lead-free tin bar smelting furnace and smelting method thereof

Abstract

The invention discloses an efficient and energy-saving lead-free tin bar smelting furnace and a smelting method thereof, and belongs to the technical field of lead-free tin bar smelting. The efficient and energy-saving lead-free tin bar smelting furnace comprises a furnace wall, a heat insulation barrel is fixedly installed in the furnace wall, a heat conduction barrel is fixedly installed in the heat insulation barrel, and the heat conduction barrel is fixedly installed on the inner ring surface of the heat insulation barrel through a connecting rod on the outer surface of the upper end; an annular groove is formed between the heat insulation cylinder and the heat conduction cylinder, an electromagnetic heating ring is fixedly installed in the annular groove, a heat insulation cover is fixedly installed on the upper surface of the furnace wall, an air circulation mechanism is fixedly installed on the upper surface of the heat insulation cover, and a containing disc is fixedly installed in the heat conduction cylinder through a connecting ring on the outer surface. A storage disc is installed on the lower surface of the expansion ring in a communicating mode, a liquid outlet is formed in one end of the storage disc, and a liquid discharging mechanism is rotationally installed in the liquid outlet. Through the design of the air circulation mechanism, the centrifugal impeller and the electromagnetic heating ring are used in cooperation, hot air circulation is formed, the smelting quality can be improved, and energy consumption can be reduced.

Description

Technical Field

[0001] The invention relates to the technical field of lead-free tin bar smelting, and in particular to a high-efficiency and energy-saving lead-free tin bar smelting furnace and a smelting method thereof. Background Art

[0002] With the rapid development of the electronics industry, the quality and production efficiency of lead-free tin bars, as an important electronic welding material, directly affect the performance and manufacturing cost of electronic products. Against the backdrop of increasing environmental awareness and rising energy costs, the high energy consumption and low efficiency of traditional lead-free tin bar melting furnaces have become increasingly prominent. Developing a lead-free tin bar melting furnace that can meet the needs of efficient production and effectively reduce energy consumption has become the key to breaking through the development bottleneck of the industry.

[0003] For example, the patent with the national authorized patent announcement number CN103402671B discloses a melting furnace for metal smelting, which can efficiently produce ingots by efficiently cooling the ingots pulled out from the mold installed in the above melting furnace. In addition, a device structure is provided, which can produce multiple ingots efficiently and maintain high quality with the help of a furnace bed. The melting furnace for metal smelting includes: a furnace bed, which holds the molten metal generated by melting the raw materials; a mold, which is charged with molten metal; a drawing fixture, which is arranged below the mold and is used to pull the cooled and solidified ingot downward; a cooling part, which cools the ingot; and an outer cylinder, which isolates the above parts from the atmosphere, and more than one mold and drawing fixture are arranged in the outer cylinder, and the cooling part is arranged between the outer cylinder and the ingot or between multiple ingots.

[0004] However, the above-mentioned smelting furnace for metal smelting does not have the function of evenly distributing the heat in the furnace during the smelting of the metal block, and thus requires additional energy consumption to make the temperature in the furnace uniform, which in turn leads to a longer smelting time. In addition, it does not have the function of conveniently dumping and blocking the molten metal during the discharge process, and the discharge amount of the molten metal cannot be accurately controlled. Summary of the invention

[0005] The object of the present invention is to provide an efficient and energy-saving lead-free tin bar melting furnace and a smelting method thereof, so as to solve the problem that in the process of melting the metal block proposed in the above-mentioned background technology, the heat in the furnace is not evenly distributed, and additional energy consumption is required to make the temperature in the furnace uniform, which will lead to prolonged melting time, and there is no convenient dumping and blocking of the molten metal during the drainage process.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A high-efficiency and energy-saving lead-free tin bar melting furnace, comprising: a furnace wall, a heat insulation cylinder is fixedly installed in the furnace wall, a heat conduction cylinder is fixedly installed in the heat insulation cylinder, the heat conduction cylinder is fixedly installed on the inner ring surface of the heat insulation cylinder through a connecting rod on the outer surface of the upper end, the heat conduction cylinder is suspended in the heat insulation cylinder, and the heat conduction cylinder is connected with the heat insulation cylinder through the overhead space on the lower surface, an annular groove is formed between the heat insulation cylinder and the heat conduction cylinder, and an electromagnetic heating ring is fixedly installed in the annular groove of the heat insulation cylinder and the heat conduction cylinder;

[0008] Wherein, a heat-insulating cover is fixedly installed on the upper surface of the furnace wall, and a wind circulation mechanism is fixedly installed on the upper surface of the heat-insulating cover. The air supply end of the wind circulation mechanism rotates and penetrates into the heat-conducting cylinder, so that the wind circulation mechanism can suck the wind in the heat-conducting cylinder and discharge the wind into the ring groove through the flow channel on the outer surface of the wind circulation mechanism through rotation to be heated by the electromagnetic heating ring, and the heated wind can be discharged into the heat-conducting cylinder again through the overhead area on the lower surface of the heat-conducting cylinder to heat and melt the lead-free tin bars placed in the placement plate, and a connecting ring is fixedly installed on the outer surface of the placement plate, and the placement plate is fixedly installed in the heat-conducting cylinder through the connecting ring on the outer surface, and an air outlet is opened on the connecting ring;

[0009] Among them, an expansion ring is fixedly installed on the outer surface of the placement plate at the bottom layer, and a storage plate is installed on the lower surface of the expansion ring. The storage plate is fixedly installed on the lower surface of the furnace wall. The placement plate is in a through-grid shape, so that the molten tin liquid can fall into the storage plate through the mesh holes of the placement plate for centralized storage. A liquid outlet is opened at one end of the storage plate, and a drainage mechanism is rotatably installed in the liquid outlet. The drainage mechanism can be connected to the liquid outlet by turning over, so that the tin liquid stored in the storage plate can be discharged through the drainage mechanism.

[0010] Preferably, windows are provided on the outer surfaces of the furnace wall, the thermal insulation tube and the heat-conducting tube, and sliding doors are slidably sealed on the outer surfaces of the furnace wall, the thermal insulation tube and the heat-conducting tube, so that the sliding doors can slide to seal the windows, and the three groups of sliding doors are fixedly connected together by connecting rods, so that when the sliding doors are pulled and slid open, the windows of the furnace wall, the thermal insulation tube and the heat-conducting tube can be opened together.

[0011] Preferably, the sliding door sliding on the outer surface of the furnace wall slides through the support rod at the same time, and the support rod is fixedly mounted on the outer surface of the furnace wall.

[0012] Preferably, the air circulation mechanism includes a frame plate, which is fixedly mounted on the upper surface of the insulation cover, a motor is fixedly mounted on the upper surface of the frame plate, the output shaft of the motor rotates and passes into the heat conduction cylinder of the furnace wall, and a centrifugal impeller is fixedly mounted on the lower surface of the output shaft of the motor.

[0013] Preferably, when the centrifugal impeller is driven to rotate by the motor, the air pressure below the centrifugal impeller is reduced to form a relatively low-pressure area, so that the air below can be "sucked" toward the centrifugal impeller. After the air enters the centrifugal impeller, it will be blown from the flow channel of the centrifugal impeller into the annular groove between the heat conducting tube and the heat insulating tube to be heated by the electromagnetic heating ring.

[0014] Preferably, the liquid discharge mechanism includes a liquid outlet pipe, which is rotatably installed in the liquid outlet port, and a liquid inlet is provided on the lower surface of the liquid outlet pipe, so that the liquid outlet pipe can rotate to unfold the liquid inlet and connect it with the liquid outlet port, thereby enabling the tin liquid in the storage disk to be discharged from the liquid outlet pipe through the liquid inlet.

[0015] Preferably, a connecting plate is fixedly installed on the upper surface of the liquid outlet pipe, a guide groove is opened in the connecting plate, a sliding column is fixedly installed in the guide groove, and a plug-in plate is slidably installed on the outer surface of the sliding column in the guide groove, so that after the liquid outlet pipe is flipped and flattened, the connecting plate can be flush with one group of support rods on the outer surface of the furnace wall, the plug-in plate slidably installed in the connecting plate can be slid into the support rod, and the flattened liquid outlet pipe can block the liquid outlet.

[0016] Preferably, a spring is sleeved on the outer surface of the sliding column, and two ends of the spring are respectively in contact between the lower surface of the guide groove and the upper surface of the plug-in plate.

[0017] Preferably, a pressing plate is fixedly mounted at one end of the plug-in plate, and the pressing plate slides out of a sliding groove. The sliding groove is provided at one end of the connecting plate and is connected to the guide groove, so that a worker can drive the plug-in plate to slide into the guide groove by pressing the pressing plate.

[0018] The present invention also provides a smelting method of a lead-free tin bar smelting furnace with high efficiency and energy saving, comprising the following steps:

[0019] S1. When melting lead-free tin bars, the sliding door can be pushed open to open the windows of the furnace wall and the heat-conducting tube, and then the staff can place the lead-free tin bar raw materials in the placement tray, and then the sliding door can be pushed to close the window of the heat-conducting tube, and then the electromagnetic heating coil and the motor can be started, and the motor can drive the centrifugal impeller to rotate at the upper end of the heat-conducting tube. The rotation of the centrifugal impeller will inhale the wind in the heat-conducting tube and let the wind pass through the flow channel on the outer surface of the centrifugal impeller through rotation. The wind is discharged into the ring groove and heated by the electromagnetic heating coil, and the heated wind is The heat can be discharged into the heat-conducting tube again through the overhead area on the lower surface of the heat-conducting tube to exchange heat with the lead-free tin bars placed in the placement tray, and the air outlets opened on the connecting ring on the outer surface of the placement tray are connected to each other, so that the heated air is sucked in again and discharged into the ring groove for secondary heating and then discharged, and this reciprocating process can accelerate the uniform distribution of heat in the heat-conducting tube, so that the lead-free tin bars can absorb a large amount of heat in a short time, quickly reach the melting point, and accelerate the smelting speed, so as to achieve the purpose of energy saving and consumption reduction and rapid and uniform distribution of heat;

[0020] S2, when the melting point of the tin bar is reached, the molten tin can fall through the mesh of the placement tray into the storage tray for centralized storage;

[0021] S3. When discharging the tin liquid in the storage disk, the staff can place a receiving container at the lower end of the liquid outlet pipe, and then press the pressing plate downward to drive the plug-in plate to slide into the guide groove of the connecting plate. During the process of the plug-in plate sliding into the guide groove, it will press on one end of the spring, so that the spring can apply an elastic thrust to the plug-in plate, and the plug-in plate sliding into the guide groove can be pulled out from the support rod, that is, the rotation restriction of the liquid outlet pipe is released, and then the liquid outlet pipe can be automatically turned downward to turn the liquid inlet opened on the lower surface to be connected with the liquid outlet, so that the tin liquid in the storage disk can be discharged from the liquid outlet pipe through the liquid inlet. After the required amount of tin liquid is discharged, the staff can turn the liquid outlet pipe upward to make the liquid outlet pipe lower. The liquid inlet opened on the surface is blocked by fitting against the upper surface of the liquid outlet, and the liquid outlet pipe after being turned over and flattened will also block the liquid outlet together, and the flattened liquid outlet pipe can make the connecting plate flush with the support rod on the outer surface of the furnace wall, so that the plug-in plate retracted into the guide groove can be slid into the support rod again through the elastic thrust applied by the spring to lock the rotation of the liquid outlet pipe, that is, the liquid can be turned down to discharge, and the liquid outlet can be blocked by turning up to stop the liquid discharge, so that the staff can control the liquid discharge time of the liquid outlet pipe as needed, so as to accurately discharge the required amount of tin liquid, which is helpful to achieve accurate control of the amount of tin liquid used in the production process, avoid waste or insufficient use of tin liquid, and is beneficial to improving product quality and production stability.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. Through the design of furnace wall, sliding door, electromagnetic heating coil, placement tray, storage tray air circulation mechanism and drainage mechanism, when smelting lead-free tin bars, the sliding door can be slid open to open the windows of the furnace wall and the heat-conducting tube, and then the staff can place the lead-free tin bar raw materials in the placement tray, and then the sliding door can be pushed to close the window of the heat-conducting tube, and then the electromagnetic heating coil and the air circulation mechanism can be started, so that the air circulation mechanism can inhale the air in the heat-conducting tube and let the air pass through the flow channel on the outer surface of the air circulation mechanism through rotation and be discharged into the ring groove to be heated by the electromagnetic heating coil, and the heated air can be discharged into the heat-conducting tube again through the overhead area on the lower surface of the heat-conducting tube to perform heat exchange with the lead-free tin bars placed in the placement tray, and when the melting point of the tin bars is reached, the tin liquid can fall into the storage tray through the mesh holes of the placement tray for centralized storage, and when the tin liquid in the storage tray needs to be discharged , the staff can place a receiving container at the lower end of the liquid outlet pipe, and then press down the discharge mechanism to connect with the liquid outlet of the storage disk, so that the tin liquid stored in the storage disk can be discharged through the discharge mechanism, until the required amount of tin liquid is discharged, the staff can flip the discharge mechanism upward to flatten it, and the flattened discharge mechanism can block the liquid outlet, that is, flipping downward to discharge liquid, flipping upward can block the liquid outlet to stop liquid discharge, so that the staff can control the liquid discharge time of the liquid outlet pipe as needed, and the wind circulation mechanism and the electromagnetic heating coil are used in conjunction, so that the wind can be sucked in, heated and then discharged into the heat conducting tube, forming a hot air circulation. This circulation method accelerates the uniform distribution of heat in the heat conducting tube, so that the lead-free tin bar can be heated more evenly, reducing local overheating or overcooling, which helps to improve the quality of smelting and reduce energy consumption.

[0024] 2. Through the design of the motor, centrifugal impeller, heat insulation cylinder and heat conduction cylinder, the lead-free tin bar raw material can be placed in the placement tray, and the electromagnetic heating ring and the motor can be started, and the motor can drive the centrifugal impeller to rotate at the upper end of the heat conduction cylinder. The rotation of the centrifugal impeller will inhale the wind in the heat conduction cylinder and discharge it into the ring groove through the flow channel on the outer surface of the centrifugal impeller through rotation to be heated by the electromagnetic heating ring. The heated wind can be discharged into the heat conduction cylinder again through the overhead area on the lower surface of the heat conduction cylinder to perform heat exchange on the lead-free tin bar placed in the placement tray, and the air outlets opened on the connecting ring on the outer surface of the placement tray are connected to each other, so that the heated wind is inhaled again and discharged into the ring groove for secondary heating and then discharged, and this reciprocating process can accelerate the uniform distribution of heat in the heat conduction cylinder, and can contact the lead-free tin bar in an all-round and uniform manner, so that the tin bar reaches the melting point faster, and the wind is continuously inhaled, heated and circulated through the centrifugal impeller, which is equivalent to increasing the frequency and intensity of heat transfer, greatly shortening the smelting time, reducing energy consumption, and improving production efficiency.

[0025] 3. Through the design of the liquid outlet pipe, the liquid inlet, the connecting plate, the plug-in plate, the spring and the pressing plate, when discharging the tin liquid in the storage disk, the staff can place a receiving container at the lower end of the liquid outlet pipe, and then press the pressing plate downward to drive the plug-in plate to slide into the guide groove of the connecting plate. During the process of the plug-in plate sliding into the guide groove, it will press on one end of the spring, so that the spring can apply an elastic thrust to the plug-in plate, and the plug-in plate sliding into the guide groove can be pulled out from the support rod, that is, the rotation restriction of the liquid outlet pipe is released, and then the liquid outlet pipe can be automatically turned downward to turn the liquid inlet opened on the lower surface to be connected with the liquid outlet, so that the tin liquid in the storage disk can be discharged from the liquid outlet pipe through the liquid inlet until the required amount of tin liquid is discharged. Afterwards, the staff can flip the liquid outlet pipe upwards to make the liquid inlet opened on the lower surface of the liquid outlet pipe fit into the upper surface of the liquid outlet and be blocked, and the turned and flattened liquid outlet pipe will also block the liquid outlet together, and the flattened liquid outlet pipe can make the connecting plate flush with the support rod on the outer surface of the furnace wall, so that the plug-in plate retracted into the guide groove can be slid into the support rod again through the elastic thrust applied by the spring to lock the rotation of the liquid outlet pipe, that is, flipping downward to discharge liquid, and flipping upward to block the liquid outlet to stop liquid discharge, so that the staff can control the liquid discharge time of the liquid outlet pipe as needed, so as to accurately discharge the required amount of tin liquid, and the whole operation process is simple and intuitive, without the need for complicated operating steps and tools, reducing the operating difficulty of the staff. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of the high-efficiency and energy-saving lead-free tin bar melting furnace of the present invention;

[0027] Figure 2 It is a structural schematic diagram of the placement tray of the present invention;

[0028] Figure 3 It is a structural schematic diagram of the electromagnetic heating coil of the present invention;

[0029] Figure 4 It is a structural schematic diagram of a three-layer sliding door of the present invention;

[0030] Figure 5 It is a structural schematic diagram of the air circulation mechanism of the present invention;

[0031] Figure 6 It is a structural schematic diagram of the wind circulation direction between the heat insulation tube and the heat conduction tube of the present invention;

[0032] Figure 7 It is a structural schematic diagram of the connecting plate and the plug-in plate of the present invention;

[0033] Figure 8 It is a schematic structural diagram of the liquid discharge mechanism of the present invention.

[0034] In the figure: 1. furnace wall; 101. insulation cover; 102. sliding door; 103. insulation tube; 104. heat-conducting tube; 105. electromagnetic heating coil; 106. placement plate; 107. connecting ring; 108. expansion ring; 109. storage plate; 110. liquid outlet; 2. air circulation mechanism; 201. motor; 202. frame plate; 203. centrifugal impeller; 3. drainage mechanism; 301. liquid outlet pipe; 302. liquid inlet; 303. connecting plate; 304. sliding groove; 305. plug-in plate; 306. pressing plate; 307. spring; 308. sliding column; 309. guide groove; 4. support rod. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] like Figure 1-Figure 4 As shown, this embodiment provides a high-efficiency and energy-saving lead-free tin bar melting furnace, comprising: a furnace wall 1, a heat insulation tube 103 is fixedly installed in the furnace wall 1, a heat conduction tube 104 is fixedly installed in the heat insulation tube 103, the heat conduction tube 104 is fixedly installed on the inner ring surface of the heat insulation tube 103 through a connecting rod on the outer surface of the upper end, the heat conduction tube 104 is suspended in the heat insulation tube 103, and the heat conduction tube 104 is connected with the heat insulation tube 103 through the overhead space on the lower surface, an annular groove is formed between the heat insulation tube 103 and the heat conduction tube 104, and an electromagnetic heating ring 105 is fixedly installed in the annular groove of the heat insulation tube 103 and the heat conduction tube 104;

[0037] Among them, a heat insulation cover 101 is fixedly installed on the upper surface of the furnace wall 1, and a wind circulation mechanism 2 is fixedly installed on the upper surface of the heat insulation cover 101. The air supply end of the wind circulation mechanism 2 rotates to pass into the heat-conducting tube 104, so that the wind circulation mechanism 2 can suck the wind in the heat-conducting tube 104 and let the wind pass through the flow channel on the outer surface of the wind circulation mechanism 2 through rotation and be discharged into the ring groove to be heated by the electromagnetic heating ring 105, and the heated wind can be discharged into the heat-conducting tube 104 again through the overhead area on the lower surface of the heat-conducting tube 104 to heat and melt the lead-free tin bars placed in the placement plate 106. A connecting ring 107 is fixedly installed on the outer surface of the placement plate 106. The placement plate 106 is fixedly installed in the heat-conducting tube 104 through the connecting ring 107 on the outer surface, and an air outlet is opened on the connecting ring 107;

[0038] Among them, an expansion ring 108 is fixedly installed on the outer surface of the placement plate 106 at the bottom layer, and a storage plate 109 is installed on the lower surface of the expansion ring 108. The storage plate 109 is fixedly installed on the lower surface of the furnace wall 1. The placement plate 106 is in a through-grid shape, so that the molten tin liquid can fall into the storage plate 109 through the mesh of the placement plate 106 for centralized storage. A liquid outlet 110 is opened at one end of the storage plate 109, and a discharge mechanism 3 is rotatably installed in the liquid outlet 110. The discharge mechanism 3 can be connected to the liquid outlet 110 by turning over, so that the tin liquid stored in the storage plate 109 can be discharged through the discharge mechanism 3.

[0039] Windows are provided on the outer surfaces of the furnace wall 1, the insulation tube 103 and the heat-conducting tube 104. The outer surfaces of the furnace wall 1, the insulation tube 103 and the heat-conducting tube 104 are slidably sealed with sliding doors 102, so that the sliding doors 102 can slide to seal the windows, and the three groups of sliding doors 102 are fixedly connected together by connecting rods, so that when the sliding doors 102 are pulled and slid open, the windows of the furnace wall 1, the insulation tube 103 and the heat-conducting tube 104 can be opened together, and the sliding doors 102 sliding on the outer surface of the furnace wall 1 slide through the support rod 4 at the same time, and the support rod 4 is fixedly installed on the outer surface of the furnace wall 1.

[0040] Through the design of the furnace wall 1, the sliding door 102, the electromagnetic heating coil 105, the placement tray 106, the storage tray 109, the wind circulation mechanism 2 and the liquid discharge mechanism 3, when the lead-free tin bar is smelted, the sliding door 102 can be first slid open to open the windows of the furnace wall 1 and the heat-conducting tube 104, and then the staff can place the lead-free tin bar raw materials in the placement tray 106, and then the sliding door 102 can be pushed to close the window of the heat-conducting tube 104, and then the electromagnetic heating coil 105 and the wind circulation mechanism 2 can be started, so as to The wind circulation mechanism 2 can inhale the wind in the heat-conducting tube 104 and, through rotation, discharge the wind into the annular groove through the flow channel on the outer surface of the wind circulation mechanism 2 to be heated by the electromagnetic heating ring 105, and the heated wind can be discharged into the heat-conducting tube 104 again through the overhead area on the lower surface of the heat-conducting tube 104 to perform heat exchange on the lead-free tin bars placed in the placement tray 106. When the melting point of the tin bars is reached, the tin liquid can fall into the storage tray 109 through the mesh of the placement tray 106 for centralized storage, and the storage tray 109 needs to be stored. When the tin liquid in the storage tray 109 is discharged, the staff can place a receiving container at the lower end of the liquid outlet pipe 301, and then press the discharge mechanism 3 downward to connect with the liquid outlet 110 of the storage tray 109, so that the tin liquid stored in the storage tray 109 can be discharged through the discharge mechanism 3, until the required amount of tin liquid is discharged, the staff can flip the discharge mechanism 3 upward to flatten it, and the flattened discharge mechanism 3 can block the liquid outlet 110, that is, flipping downward to discharge liquid, and flipping upward can block the liquid outlet 110 to stop liquid discharge, so that the staff can control the liquid discharge time of the liquid outlet pipe 301 as needed, and the wind circulation mechanism 2 and the electromagnetic heating coil 105 are used in conjunction, so that the wind can be sucked in, heated, and then discharged into the heat-conducting tube 104, forming a hot air circulation. This circulation method accelerates the uniform distribution of heat in the heat-conducting tube 104, so that the lead-free tin bar can be heated more evenly, reducing the situation of local overheating or overcooling, which is helpful to improve the quality of smelting and reduce energy consumption.

[0041] like Figure 5-Figure 6 As shown, the air circulation mechanism 2 includes a frame plate 202, which is fixedly mounted on the upper surface of the insulation cover 101, and a motor 201 is fixedly mounted on the upper surface of the frame plate 202. The output shaft of the motor 201 rotates and passes into the heat-conducting tube 104 of the furnace wall 1, and a centrifugal impeller 203 is fixedly mounted on the lower surface of the output shaft of the motor 201.

[0042] In this way, when the centrifugal impeller 203 is driven to rotate by the motor 201, the air pressure below the centrifugal impeller 203 is reduced, forming a relatively low-pressure area, so that the air below can be "sucked" toward the centrifugal impeller 203. After the air enters the centrifugal impeller 203, it will be accelerated and blown from the flow channel of the centrifugal impeller 203 into the annular groove between the heat conducting tube 104 and the heat insulating tube 103 to be heated by the electromagnetic heating ring 105.

[0043] Through the design of the motor 201, the centrifugal impeller 203, the heat insulating tube 103 and the heat conducting tube 104, the lead-free tin bar raw material is placed in the placing plate 106, and the electromagnetic heating coil 105 and the motor 201 can be started, and the motor 201 can drive the centrifugal impeller 203 to rotate at the upper end of the heat conducting tube 104, and the rotation of the centrifugal impeller 203 will suck the wind in the heat conducting tube 104, and the wind is discharged into the annular groove through the flow channel on the outer surface of the centrifugal impeller 203 through rotation, and is heated by the electromagnetic heating coil 105, and the heated wind can be discharged into the heat conducting tube again through the overhead area on the lower surface of the heat conducting tube 104 104 performs heat exchange on the lead-free tin bars placed in the placing tray 106, and the tuyere 107 on the outer surface of the placing tray 106 is opened to connect with each other, so that the heated wind is sucked in again and discharged into the ring groove for secondary heating and then discharged, and this reciprocating process can accelerate the hot wind to evenly distribute the heat in the heat-conducting cylinder 104, and can contact the lead-free tin bars in an all-round and even manner, so that the tin bars reach the melting point faster, and the wind is continuously sucked in, heated and circulated through the centrifugal impeller 203, which is equivalent to increasing the frequency and intensity of heat transfer, greatly shortening the smelting time and reducing energy consumption, and improving production efficiency.

[0044] like Figure 7-Figure 8 As shown, the liquid discharge mechanism 3 includes a liquid outlet pipe 301, which is rotatably installed in the liquid outlet port 110, and a liquid inlet 302 is provided on the lower surface of the liquid outlet pipe 301, so that the liquid outlet pipe 301 can be rotated to unfold the liquid inlet 302 and connect it with the liquid outlet port 110, so that the tin liquid in the storage disk 109 can be discharged from the liquid outlet pipe 301 through the liquid inlet 302.

[0045] The upper surface of the liquid outlet pipe 301 is fixedly installed with a connecting plate 303, a guide groove 309 is provided in the connecting plate 303, a sliding column 308 is fixedly installed in the guide groove 309, and a plug-in plate 305 is slidably installed on the outer surface of the sliding column 308 in the guide groove 309, so that after the liquid outlet pipe 301 is turned over and flattened, the connecting plate 303 can be flush with one group of support rods 4 on the outer surface of the furnace wall 1, and the plug-in plate 305 slidably installed in the connecting plate 303 can be slidably inserted into the support rod 4, and the flattened liquid outlet pipe 301 can be turned over and flattened. 01 blocks the liquid outlet 110, and a spring 307 is mounted on the outer surface of the sliding column 308. The two ends of the spring 307 respectively touch the lower surface of the guide groove 309 and the upper surface of the plug-in plate 305. A pressing plate 306 is fixedly installed at one end of the plug-in plate 305. The pressing plate 306 slides out of the sliding groove 304. The sliding groove 304 is provided at one end of the connecting plate 303 and is connected to the guide groove 309, so that the staff can drive the plug-in plate 305 to slide into the guide groove 309 by pressing the pressing plate 306.

[0046] Through the design of the liquid outlet pipe 301, the liquid inlet 302, the connecting plate 303, the plug-in plate 305, the spring 307 and the pressing plate 306, when the tin liquid in the storage disk 109 is discharged, the staff can place a receiving container at the lower end of the liquid outlet pipe 301, and then press the pressing plate 306 downward to drive the plug-in plate 305 to slide into the guide groove 309 of the connecting plate 303. In the process of the plug-in plate 305 sliding into the guide groove 309, it will press against the spring 307. 307, so that the spring 307 can apply a spring thrust to the plug-in plate 305, and the plug-in plate 305 that is retracted into the guide groove 309 can be pulled out of the support rod 4, that is, the rotation restriction on the liquid outlet pipe 301 is released, and then the liquid outlet pipe 301 can automatically turn downward to turn the liquid inlet 302 opened on the lower surface to communicate with the liquid outlet 110, so that the tin liquid in the storage disk 109 can be discharged from the liquid outlet pipe 301 through the liquid inlet 302. 1 until the required amount of tin liquid is discharged, the staff can flip the liquid outlet pipe 301 upwards to make the liquid inlet 302 opened on the lower surface of the liquid outlet pipe 301 fit against the upper surface of the liquid outlet 110 and be blocked, and the liquid outlet pipe 301 after flipping and flattening will also block the liquid outlet 110 together, and the flattened liquid outlet pipe 301 can make the connecting plate 303 flush with the support rod 4 on the outer surface of the furnace wall 1, so that the plug-in plate 305 that has been retracted into the guide groove 309 can be slid into the support rod 4 again through the elastic thrust applied by the spring 307 to lock the rotation of the liquid outlet pipe 301, that is, the liquid is flipped downward to discharge, and the upward flipping can block the liquid outlet 110 to stop the liquid discharge, so that the staff can control the liquid discharge time of the liquid outlet pipe 301 as needed, so as to accurately discharge the required amount of tin liquid, and the whole operation process is simple and intuitive, without the need for complicated operation steps and tools, reducing the difficulty of operation for the staff.

[0047] Among them, this embodiment introduces the hot air circulation efficiency factor equation, the equation form is as follows:

[0048] ,in:

[0049] ηh: hot air circulation efficiency factor (dimensionless);

[0050] w: centrifugal impeller speed (rad / s);

[0051] P e : Electromagnetic heating power (W);

[0052] A d : Effective cross-sectional area of ​​air duct (m²);

[0053] ΔT: temperature difference between hot air and tin bar (K);

[0054] t: heating time (s);

[0055] τ: system thermal response time constant (s);

[0056] k: Equipment structure coefficient (related to the geometric parameters of the guide tube).

[0057] Application examples:

[0058] When the electromagnetic power Pe=5kW, the impeller speed w=1200rpm, and the air duct cross-sectional area Ad=0.02m 2 The system response time τ=18s was measured experimentally. When the temperature difference ΔT=150K and the heating time t=300s, substituting the above data into the above equation, we can get ηh≈2.37.

[0059] Technical effects:

[0060] When ηh>1.8, the hot air circulation reaches a high-efficiency energy-saving mode; energy consumption can be optimized by adjusting the ratio of w and Pe; the index term reflects the dynamic response characteristics of the system and guides the setting of the preheating time.

[0061] Compared with the traditional steady-state heat transfer equation, the hot air circulation efficiency factor equation is a composite equation containing dynamic response terms, which integrates the electromagnetic-fluid-structure coupling effect, so that the smelting energy consumption of this smelting furnace is significantly reduced compared with the traditional resistance heating furnace.

[0062] The optimization process of the hot air circulation in this embodiment is as follows:

[0063] 1. Establish the objective function: maxηh through the HCEF equation;

[0064] 2. Set the constraints: w≤1500rpm, ΔT≥100K;

[0065] 3. Use genetic algorithm to solve the optimal (Pe,w) combination;

[0066] 4. Experimental verification shows the best matching point: Pe=4.2kW, w=1350rpm.

[0067] This embodiment also provides a smelting method of a lead-free tin bar smelting furnace with high efficiency and energy saving, comprising the following steps:

[0068] S1. When melting lead-free tin bars, the sliding door 102 can be first slid open to open the windows of the furnace wall 1 and the heat-conducting tube 104, and then the staff can place the lead-free tin bar raw materials in the placement tray 106, and then the sliding door 102 can be pushed to close the window of the heat-conducting tube 104, and then the electromagnetic heating coil 105 and the motor 201 can be started, and the motor 201 can drive the centrifugal impeller 203 to rotate at the upper end of the heat-conducting tube 104, and the rotation of the centrifugal impeller 203 will inhale the wind in the heat-conducting tube 104, and the wind will be discharged into the annular groove through the flow channel on the outer surface of the centrifugal impeller 203 through the rotation, and then be heated by the electromagnetic heating coil 105. 05 heating, and the heated wind can be discharged into the heat-conducting tube 104 again through the overhead area on the lower surface of the heat-conducting tube 104 to exchange heat with the lead-free tin bars placed in the placement plate 106, and the air outlets opened on the connecting ring 107 on the outer surface of the placement plate 106 are mutually connected, so that the heated wind is sucked in again and discharged into the ring groove for secondary heating and then discharged, and this reciprocating process can accelerate the uniform distribution of heat in the heat-conducting tube 104 by the hot wind, so that the lead-free tin bars can absorb a large amount of heat in a relatively short time, quickly reach the melting point, and accelerate the smelting speed, so as to achieve the purpose of energy saving and consumption reduction and rapid and uniform distribution of heat;

[0069] S2, when the melting point of the tin bar is reached, the tin liquid can fall through the mesh of the placement tray 106 into the storage tray 109 for centralized storage;

[0070] S3. When discharging the tin liquid in the storage disk 109, the staff can place a receiving container at the lower end of the liquid outlet pipe 301, and then press the pressing plate 306 downward to drive the plug-in plate 305 to slide into the guide groove 309 of the connecting plate 303. During the process of the plug-in plate 305 sliding into the guide groove 309, it will press on one end of the spring 307, so that the spring 307 can apply an elastic thrust to the plug-in plate 305, and the plug-in plate 305 sliding into the guide groove 309 can be pulled out from the support rod 4, that is, the rotation restriction on the liquid outlet pipe 301 is released, and then the liquid outlet pipe 301 can be automatically turned downward to turn the liquid inlet 302 opened on the lower surface to be connected with the liquid outlet 110, so that the tin liquid in the storage disk 109 can be discharged from the liquid outlet pipe 301 through the liquid inlet 302. After the required amount of tin liquid is discharged, the staff can turn the liquid outlet pipe upward. The tube 301 is used to make the liquid inlet 302 opened on the lower surface of the liquid outlet pipe 301 fit into the upper surface of the liquid outlet 110 and be blocked, and the liquid outlet pipe 301 after being turned over and flattened will also block the liquid outlet 110 together, and the flattened liquid outlet pipe 301 can make the connecting plate 303 flush with the support rod 4 on the outer surface of the furnace wall 1, so that the plug-in plate 305 that is retracted into the guide groove 309 can be slid into the support rod 4 again through the elastic thrust applied by the spring 307 to lock the rotation of the liquid outlet pipe 301, that is, the liquid is turned downward to discharge, and the liquid outlet 110 can be blocked by turning upward to stop the liquid discharge, so that the staff can control the liquid discharge time of the liquid outlet pipe 301 as needed, so as to accurately discharge the required amount of tin liquid, which is helpful to achieve accurate control of the amount of tin liquid used in the production process, avoid waste or insufficient use of tin liquid, and is beneficial to improving product quality and production stability.

[0071] According to the above technical scheme, the working steps of this scheme are summarized and sorted out: when melting lead-free tin bars, the sliding door 102 can be slid open to open the windows of the furnace wall 1 and the heat-conducting tube 104, and then the staff can place the lead-free tin bar raw materials in the placement tray 106, and then the sliding door 102 can be pushed to close the window of the heat-conducting tube 104, and then the electromagnetic heating coil 105 and the motor 201 can be started, and the motor 201 can drive the centrifugal impeller 203 to rotate at the upper end of the heat-conducting tube 104, and the rotation of the centrifugal impeller 203 will suck the wind in the heat-conducting tube 104, and the wind will be discharged into the annular groove through the flow channel on the outer surface of the centrifugal impeller 203 through rotation, and then the electromagnetic heating coil 105 and the motor 201 can be started, and the motor 201 can drive the centrifugal impeller 203 to rotate at the upper end of the heat-conducting tube 104. 05 is heated, and the heated wind can be discharged into the heat-conducting tube 104 again through the overhead area on the lower surface of the heat-conducting tube 104 to perform heat exchange on the lead-free tin bars placed in the placement tray 106, and the wind outlets are opened on the connecting ring 107 on the outer surface of the placement tray 106 to connect with each other, so that the heated wind is sucked in again and discharged into the ring groove for secondary heating and then discharged, and this reciprocating process can accelerate the uniform distribution of heat in the heat-conducting tube 104, and after reaching the melting point of the tin bars, the tin liquid can fall into the storage tray 109 through the mesh of the placement tray 106 for centralized storage, and when the tin liquid in the storage tray 109 needs to be discharged, the staff can use it at the lower end of the liquid outlet pipe 301 The receiving container is placed, and then the pressing plate 306 can be pressed down to drive the plug-in plate 305 to slide into the guide groove 309 of the connecting plate 303. During the process of the plug-in plate 305 sliding into the guide groove 309, it will press on one end of the spring 307, so that the spring 307 can apply an elastic thrust to the plug-in plate 305, and the plug-in plate 305 sliding into the guide groove 309 can be pulled out from the support rod 4, that is, the rotation restriction on the liquid outlet pipe 301 is released, and then the liquid outlet pipe 301 can be automatically turned downward to turn the liquid inlet 302 opened on the lower surface to be connected with the liquid outlet 110, so that the tin liquid in the storage disk 109 can be discharged from the liquid outlet pipe 3 through the liquid inlet 302. 01 until the required amount of tin liquid is discharged, the staff can flip the liquid outlet pipe 301 upwards to make the liquid inlet 302 opened on the lower surface of the liquid outlet pipe 301 fit against the upper surface of the liquid outlet 110 and be blocked, and the turned and flattened liquid outlet pipe 301 will also block the liquid outlet 110, and the flattened liquid outlet pipe 301 can make the connecting plate 303 flush with the support rod 4 on the outer surface of the furnace wall 1, so that the plug-in plate 305 that has been retracted into the guide groove 309 can be slid into the support rod 4 again through the elastic thrust applied by the spring 307 to lock the rotation of the liquid outlet pipe 301, that is, the liquid is turned downward to discharge, and the liquid outlet 110 can be blocked by turning upward to stop the liquid discharge.

[0072] In summary, the coordinated use of the centrifugal impeller 203 and the electromagnetic heating coil 105 can cause the air to be sucked in, heated, and then discharged into the heat-conducting tube 104, thereby forming a hot air circulation. This circulation method accelerates the uniform distribution of heat in the heat-conducting tube 104, so that the lead-free tin bar can be heated more evenly, reducing the situation of local overheating or overcooling, which is helpful to improve the quality of smelting and reduce energy consumption. When the tin liquid is discharged, the liquid can be discharged by turning it downward, and turning it upward can block the liquid outlet 110 to stop the liquid from discharging, so that the staff can control the liquid discharge time of the liquid outlet pipe 301 as needed, thereby accurately discharging the required amount of tin liquid.

[0073] Parts not involved in the present invention are the same as the prior art or can be implemented by the prior art. Although the embodiments of the present invention have been shown and described, it is understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-efficiency and energy-saving lead-free tin bar melting furnace, characterized in that: include: A furnace wall (1), wherein a heat insulating tube (103) is fixedly installed in the furnace wall (1), a heat conducting tube (104) is fixedly installed in the heat insulating tube (103), the heat conducting tube (104) is fixedly installed on the inner ring surface of the heat insulating tube (103) via a connecting rod on the outer surface of the upper end, the heat conducting tube (104) is suspended in the heat insulating tube (103), and the heat conducting tube (104) is connected to the heat insulating tube (103) via the suspended space on the lower surface, an annular groove is formed between the heat insulating tube (103) and the heat conducting tube (104), and an electromagnetic heating ring (105) is fixedly installed in the annular grooves of the heat insulating tube (103) and the heat conducting tube (104); A heat-insulating cover (101) is fixedly mounted on the upper surface of the furnace wall (1), and a wind circulation mechanism (2) is fixedly mounted on the upper surface of the heat-insulating cover (101). The air supply end of the wind circulation mechanism (2) is rotated to pass into the heat-conducting tube (104), so that the wind circulation mechanism (2) can suck the wind in the heat-conducting tube (104) and allow the wind to pass through the flow channel on the outer surface of the wind circulation mechanism (2) through rotation and be discharged into the ring groove to be heated by the electromagnetic heating ring (105). The heated wind is discharged into the heat-conducting tube (104) again through the overhead area on the lower surface of the heat-conducting tube (104) to heat and melt the lead-free tin bars placed in the placement plate (106). A connecting ring (107) is fixedly mounted on the outer surface of the placement plate (106). The placement plate (106) is fixedly mounted in the heat-conducting tube (104) through the connecting ring (107) on the outer surface, and an air outlet is provided on the connecting ring (107).

2. The high-efficiency and energy-saving lead-free tin bar melting furnace according to claim 1, characterized in that: An expansion ring (108) is fixedly mounted on the outer surface of the placement plate (106) at the bottom layer, and a storage plate (109) is connected and mounted on the lower surface of the expansion ring (108). The storage plate (109) is fixedly mounted on the lower surface of the furnace wall (1). The placement plate (106) is in a through-grid shape, so that the molten tin liquid can pass through the mesh holes of the placement plate (106) and fall into the storage plate (109) for centralized storage. A liquid outlet (110) is provided at one end of the storage plate (109), and a liquid discharge mechanism (3) is rotatably mounted in the liquid outlet (110). The liquid discharge mechanism (3) can be connected to the liquid outlet (110) by turning over, so that the tin liquid stored in the storage plate (109) can be discharged through the liquid discharge mechanism (3); The outer surfaces of the furnace wall (1), the heat insulating tube (103) and the heat conducting tube (104) are all provided with windows, and the outer surfaces of the furnace wall (1), the heat insulating tube (103) and the heat conducting tube (104) are all slidably sealed with sliding doors (102), so that the sliding doors (102) can slide to seal the windows, and the three groups of sliding doors (102) are fixedly connected together by connecting rods, so that when the sliding doors (102) are pulled and slid open, the windows of the furnace wall (1), the heat insulating tube (103) and the heat conducting tube (104) can be opened together.

3. The high-efficiency and energy-saving lead-free tin bar melting furnace according to claim 2, characterized in that: The sliding door (102) that slides on the outer surface of the furnace wall (1) simultaneously slides through the support rod (4), and the support rod (4) is fixedly mounted on the outer surface of the furnace wall (1).

4. The high-efficiency and energy-saving lead-free tin bar melting furnace according to claim 3, characterized in that: The air circulation mechanism (2) comprises a frame plate (202), the frame plate (202) being fixedly mounted on the upper surface of the heat insulation cover (101), a motor (201) being fixedly mounted on the upper surface of the frame plate (202), an output shaft of the motor (201) being rotatably inserted into a heat conduction cylinder (104) of the furnace wall (1), and a centrifugal impeller (203) being fixedly mounted on the lower surface of the output shaft of the motor (201).

5. The high-efficiency and energy-saving lead-free tin bar melting furnace according to claim 4, characterized in that: When the centrifugal impeller (203) is driven to rotate by the motor (201), the air pressure below the centrifugal impeller (203) is reduced, forming a relatively low-pressure area, so that the air below can be "sucked" toward the centrifugal impeller (203). After the air enters the centrifugal impeller (203), it is accelerated and blown from the flow channel of the centrifugal impeller (203) into the annular groove between the heat-conducting cylinder (104) and the heat-insulating cylinder (103) to be heated by the electromagnetic heating ring (105).

6. The high-efficiency and energy-saving lead-free tin bar melting furnace according to claim 5, characterized in that: The liquid discharge mechanism (3) comprises a liquid outlet pipe (301), the liquid outlet pipe (301) being rotatably mounted in the liquid outlet port (110), and a liquid inlet (302) being provided on the lower surface of the liquid outlet pipe (301), so that the liquid outlet pipe (301) can be rotated to unfold the liquid inlet (302) and connect it to the liquid outlet port (110), thereby enabling the tin liquid in the storage disk (109) to be discharged from the liquid outlet pipe (301) through the liquid inlet (302).

7. The high-efficiency and energy-saving lead-free tin bar melting furnace according to claim 6, characterized in that: A connecting plate (303) is fixedly mounted on the upper surface of the liquid outlet pipe (301), a guide groove (309) is provided in the connecting plate (303), a sliding column (308) is fixedly mounted in the guide groove (309), and an inserting plate (305) is slidably mounted on the outer surface of the sliding column (308) in the guide groove (309), so that after the liquid outlet pipe (301) is turned over and flattened, the connecting plate (303) can be flush with one group of support rods (4) on the outer surface of the furnace wall (1), the inserting plate (305) slidably mounted in the connecting plate (303) can be slidably inserted into the support rods (4), and the flattened liquid outlet pipe (301) can block the liquid outlet (110).

8. The high-efficiency and energy-saving lead-free tin bar melting furnace according to claim 7, characterized in that: A spring (307) is sleeved on the outer surface of the sliding column (308), and two ends of the spring (307) respectively contact between the lower surface of the guide groove (309) and the upper surface of the insertion plate (305).

9. The high-efficiency and energy-saving lead-free tin bar melting furnace according to claim 8, characterized in that: A pressing plate (306) is fixedly mounted on one end of the plug-in plate (305), and the pressing plate (306) slides out of the sliding groove (304). The sliding groove (304) is provided at one end of the connecting plate (303) and is connected to the guide groove (309), so that a worker can drive the plug-in plate (305) to slide into the guide groove (309) by pressing the pressing plate (306).

10. A smelting method of the high-efficiency and energy-saving lead-free tin bar smelting furnace according to claim 9, characterized in that: The following steps are involved: S1. When melting lead-free tin bars, the sliding door (102) is first pushed open to open the windows of the furnace wall (1) and the heat-conducting tube (104). The staff places the lead-free tin bar raw material in the placement tray (106), and then pushes the sliding door (102) to close the window of the heat-conducting tube (104). The electromagnetic heating coil (105) and the motor (201) are started. The motor (201) drives the centrifugal impeller (203) to rotate at the upper end of the heat-conducting tube (104). The rotation of the centrifugal impeller (203) draws in the wind in the heat-conducting tube (104) and the wind is discharged into the annular groove through the flow channel on the outer surface of the centrifugal impeller (203) through the rotation and is electromagnetically heated. The heat ring (105) is heated, and the heated air is discharged into the heat-conducting tube (104) again through the overhead area on the lower surface of the heat-conducting tube (104) to perform heat exchange with the lead-free tin bars placed in the placement plate (106). The air outlets are opened on the connecting ring (107) on the outer surface of the placement plate (106) to communicate with each other, so that the heated air is sucked in again and discharged into the ring groove for secondary heating and then discharged. This reciprocating process can accelerate the uniform distribution of heat in the heat-conducting tube (104), so that the lead-free tin bars can absorb a large amount of heat in a short time, quickly reach the melting point, and accelerate the melting speed, thereby achieving the purpose of energy saving and consumption reduction and rapid and uniform distribution of heat; S2, after the melting point of the tin bar is reached, the molten tin can be dropped into the storage tray (109) through the mesh of the placement tray (106) for centralized storage; S3. When discharging the tin liquid in the storage disk (109), the staff places a receiving container at the lower end of the liquid outlet pipe (301), and then presses down the pressing plate (306) to drive the plug-in plate (305) to slide into the guide groove (309) of the connecting plate (303). During the process of the plug-in plate (305) sliding into the guide groove (309), it presses against one end of the spring (307), thereby enabling the spring (307) to press against the plug-in plate (305). 5) applying an elastic thrust, the insertion plate (305) in the guide groove (309) is pulled out from the support rod (4), thus releasing the rotation restriction on the liquid outlet pipe (301), and then the liquid outlet pipe (301) can automatically turn downward to turn the liquid inlet (302) opened on the lower surface to communicate with the liquid outlet (110), so that the tin liquid in the storage disk (109) can be discharged from the liquid outlet pipe (301) through the liquid inlet (302). ) until the required amount of tin liquid is discharged, and then the staff can flip the liquid outlet pipe (301) upwards to make the liquid inlet (302) opened on the lower surface of the liquid outlet pipe (301) fit against the upper surface of the liquid outlet (110) and be blocked. The liquid outlet pipe (301) after flipping and flattening will also block the liquid outlet (110), and the flattened liquid outlet pipe (301) can make the connecting plate (303) flush with the support rod (4) on the outer surface of the furnace wall (1), so that the plug-in plate (305) retracted into the guide groove (309) can be slid into the support rod (4) again by the elastic thrust applied by the spring (307) to lock the rotation of the liquid outlet pipe (301), so as to realize the downward flipping and liquid discharge. The upward flipping can block the liquid outlet (110) and stop the liquid discharge, so that the staff can control the liquid discharge time of the liquid outlet pipe (301) as needed, so as to accurately discharge the required amount of tin liquid.

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