A metal powder metallurgy sintering furnace and its sintering method

Abstract

The present invention discloses a metal powder metallurgy sintering furnace and its sintering method, which relates to the application field of roller hearth sintering furnaces. The metal sintering furnace includes a main furnace hearth, and a pre-sintering zone, a sintering zone and a heat preservation zone are sequentially arranged inside the main furnace hearth. Auxiliary furnace hearths are arranged on both sides of the main furnace hearth. There is a roller hearth feeding mechanism inside the metal sintering furnace, and the roller hearth feeding mechanism includes a feeding conveying component, a turning conveying component and a discharging conveying component. By arranging auxiliary furnace hearths on both sides of the main furnace hearth, the present invention can utilize the auxiliary furnace hearths to keep the main furnace hearth warm and save heat energy. The U-shaped roller hearth feeding mechanism is not only convenient for workers to load and unload materials at the same working location, but also can add a heat preservation zone and extend the cooling zone to the metal sintering furnace. The heat preservation zone reduces the temperature of the metal products to achieve the purpose of preliminary heat preservation and cooling. The cooling zone is located on the side of the main furnace hearth, and the temperature is further reduced compared with the heat preservation zone. The heat lost from the main furnace hearth is used to further keep the metal products warm and cool.

Description

Technical Field

[0001] The present invention relates to the field of roller hearth sintering furnaces, and specifically to a metal powder metallurgy sintering furnace and its sintering method. Background Art

[0002] A metal powder sintering furnace is a device used for the forming and processing of metal powders. It heats the metal powders to a temperature close to their melting point, enabling the powder particles to combine through diffusion and melting, ultimately forming the desired metal products. The sintering process is commonly used in the production of parts with complex shapes, especially in the powder metallurgy industry, and is often seen in the manufacturing of products such as gears, bearings, and filter elements.

[0003] The operation of metal powder sintering generally includes steps such as powder loading and shaping, preheating, sintering, and cooling. The steps that mainly require the sintering furnace are the sintering of the materials. Common sintering furnaces include resistance furnaces, vacuum furnaces, belt furnaces, etc. Among belt furnaces, the widely used ones are mesh belt sintering furnaces and roller hearth sintering furnaces. For metal materials such as gears, the operator evenly stacks the gears in a high-temperature-resistant material basket. The basket containing the materials is placed on the roller conveyor belt. The materials enter the pre-sintering zone of the sintering furnace and are heated at a temperature of approximately 400°C - 600°C. The main purpose of preheating is to remove impurities such as moisture, volatiles, and oxides in the powder. Then the materials enter the sintering zone of the sintering furnace and undergo high-temperature sintering at approximately 1000°C - 1300°C, heating the metal powders to the melting point and enabling the powder particles to combine through diffusion and melting to form metal products. Finally, the metal products are transported to the cooling zone, and after cooling, they are collected for the next process such as polishing.

[0004] For a belt-type roller hearth sintering furnace, its furnace channel will include a pre-sintering zone, a sintering zone, and a cooling zone. The outer wall of the furnace body is made of materials with good high-temperature resistance and heat insulation as a whole. And heat insulation plates are provided between the pre-sintering zone and the sintering zone, as well as between the sintering zone and the cooling zone to prevent the heat of different zones from affecting each other. Due to the fact that the rollers of the roller hearth sintering furnace penetrate the outside of the furnace body and are connected to the driving equipment, this causes the rollers themselves to carry away a relatively large amount of heat in the furnace body. This part of the heat will not only be lost in the air, resulting in waste of energy, but also affect the driving equipment, making the driving equipment in a relatively high working environment for a long time, shortening the service life of the driving equipment. At the same time, when using a roller hearth sintering furnace to produce metal products, the metal products are stacked in the material basket, making one side of the metal product directly exposed to the high-temperature environment, while the other side of the metal product will be in contact with the material basket. Especially when the temperature of the metal product rises rapidly in a short time, there is a temperature difference between the upper and lower sides of the metal product, and uneven heating is likely to cause a risk of cracking in the later use of the metal product. Summary of the Invention

[0005] Based on this, the object of the present invention is to provide a metal powder metallurgy sintering furnace and a sintering method thereof to solve the technical problems mentioned in the above background.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a metal powder metallurgy sintering furnace, the metal sintering furnace comprises a main furnace track, and the interior of the main furnace track is sequentially provided with a pre-sintering zone, a sintering zone and a heat preservation zone, and both the pre-sintering zone and the sintering zone are provided with flame spraying components, and both sides of the main furnace track are provided with auxiliary furnace tracks, a roller feeding mechanism is provided inside the metal sintering furnace, the roller feeding mechanism comprises a feeding conveying component, a turning conveying component and a discharging conveying component, the feeding conveying component comprises a plurality of groups of rollers, and the plurality of groups of rollers located in the feeding conveying component, two adjacent groups of rollers are connected by transmission by setting a first sprocket component, the turning conveying component also comprises a plurality of groups of rollers, and the plurality of groups of rollers located in the turning conveying component are connected with a first transmission system, the discharging conveying component also comprises a plurality of groups of rollers, and the plurality of groups of rollers located in the discharging conveying component are connected with a second transmission system, and a group of rollers in the feeding conveying component and a group of rollers in the discharging conveying component are connected by transmission by setting a third transmission system.

[0007] By adopting the above technical scheme, auxiliary furnaces are arranged on both sides of the main furnace, and the auxiliary furnaces can be used to insulate the main furnace, saving heat energy. A U-shaped roller feeding mechanism is arranged so that metal products can be fed and then unloaded back and forth. This is not only convenient for workers to load and unload materials at the same work location, but also can add an insulation zone and an extended cooling zone to the metal sintering furnace. The insulation zone can reduce the temperature of the metal products to achieve the purpose of insulation and cooling, and avoid cracking of the metal products due to a sudden drop in temperature. The cooling zone is located on the side of the main furnace, and the temperature is further lower than that of the insulation zone. The heat lost in the main furnace is used to further insulate and cool the metal products.

[0008] The present invention is further configured such that cooling zones are provided in the two groups of auxiliary furnaces, a first insulation plate is provided between the pre-firing zone and the sintering zone, a second insulation plate is provided between the sintering zone and the insulation zone, and the second insulation plate extends between the insulation zone and the cooling zone, and a third insulation plate is provided between the main furnace and the two groups of auxiliary furnaces.

[0009] Preferably, a plurality of groups of insulation plates are provided to reduce heat exchange among the pre-sintering zone, the sintering zone, the heat preservation zone and the cooling zone of the metal sintering furnace.

[0010] The present invention is further configured such that the number of flame spraying assemblies in the pre-burning zone is less than the number of flame spraying assemblies in the sintering zone, and a fuel delivery pipeline is provided on one side of the main furnace.

[0011] Preferably, by arranging a small number of flame - spraying components in the pre - sintering area, the temperature in the pre - sintering area can reach the pre - heating temperature, and by arranging more flame - spraying components in the sintering area, the temperature in the sintering area can reach the sintering temperature. The fuel delivery pipeline is used to deliver fuel to the flame - spraying components, for example, a metal combustion furnace using hydrogen as an energy source.

[0012] The present invention is further configured such that the first transmission system and the second transmission system operate in the same manner. The second transmission system includes a driving device, and the output end of the driving device is connected to a first transmission shaft. The first transmission shaft is connected to a plurality of second transmission shafts through a plurality of sets of bevel gear sets. The ends of the plurality of second transmission shafts are all connected to second sprocket assemblies, and the plurality of second sprocket assemblies are connected to the drums of the discharge conveying assembly.

[0013] Preferably, by setting the first transmission system to drive the steering conveying assembly to work, the space where the conveying assembly is located is a heat - preservation area. The temperature in the heat - preservation area mainly comes from the heat transfer of the sintering area, and the temperature is lower than that in the sintering area. Therefore, less heat in the heat - preservation area is lost through the first transmission system. The second transmission system is set to drive the discharge conveying assembly. The space where the discharge conveying assembly is located is a cooling area. The temperature in the cooling area mainly comes from the heat transfer of the sintering area and the heat - preservation area, and the temperature will further decrease. Therefore, less heat in the two cooling areas is lost through the second transmission system.

[0014] The present invention is further configured such that there are a plurality of sets of the third transmission system. The third transmission system includes a third transmission shaft, and a spur gear set is arranged at one end of the third transmission shaft. The spur gear set is connected to the drum of the feeding conveying assembly. A third sprocket assembly is arranged at the other end of the third transmission shaft, and the third sprocket assembly is connected to the drum of the discharge conveying assembly.

[0015] Preferably, by arranging a plurality of sets of the third transmission system to connect the feeding conveying assembly and the discharge conveying assembly, their running directions are opposite, and the number of the third transmission systems is set to ensure that the roller - type feeding mechanism can operate stably. Thus, the heat of the drum of the feeding conveying assembly is less transferred to the drum of the discharge conveying assembly, reducing the loss of the temperature of the main furnace track.

[0016] The present invention is further configured such that there are two sets of the roller - type feeding mechanisms arranged symmetrically, and arc - shaped plates are arranged on the tops of the two sets of roller - type feeding mechanisms, and a plurality of material - holding racks are arranged on the tops of the two sets of roller - type feeding mechanisms.

[0017] Preferably, by arranging two sets of roller - type feeding mechanisms, not only can the working efficiency be increased, but the two sets of roller - type feeding mechanisms are arranged to match with two sets of auxiliary furnace tracks, and the two sets of auxiliary furnace tracks can insulate the two sides of the main furnace track.

[0018] The present invention is further configured such that the material storage rack includes a chassis, and multiple groups of first pulleys are provided on the side of the chassis, and handrails are provided on both sides of the chassis. The top of the chassis is rotatably connected to a movable rack, and multiple groups of second pulleys are provided at the bottom of the movable rack, and multiple groups of V-shaped storage racks for storing metal products are provided at the top of the movable rack.

[0019] Preferably, by arranging the movable material storage rack to act with the arc-shaped plate, the metal products can deflect the angle within the V-shaped storage rack.

[0020] The present invention is further configured such that an arched seat is provided inside the V-shaped storage rack, and the arc length of the arched seat matches the width of the metal product.

[0021] Preferably, by providing an arched seat that matches the width of the metal product, it can not only be used to support the metal product, but also allow more than half of the area of the metal product to directly contact the heat source. After the metal product deflects, the metal product can be sintered evenly, improving the sintering temperature.

[0022] A sintering method using a metal powder metallurgy sintering furnace, the process of which includes the following steps:

[0023] S1: When the metal sintering furnace is in a working state, first, the staff stacks multiple groups of metal products to be sintered as a whole in the material storage rack, and then places the material storage rack full of metal products on the top of the rollers of the feeding conveying assembly, and the material storage rack is placed against one side of the arc-shaped plate when placed;

[0024] S2: Start the roller-type feeding mechanism, and the material storage rack is transported to the pre-sintering area of the metal sintering furnace. The metal products are pre-heated at 400°C - 600°C, and then the material storage rack is transported to the sintering area of the metal sintering furnace. One side of the metal products is sintered at a high temperature of 1000°C - 1300°C. The material storage rack continues to move to the position of the arc-shaped plate, and the arc-shaped plate will lift the part of the movable rack of the material storage rack, causing multiple groups of metal products to deflect and move, and then the other side of the metal products undergoes high-temperature sintering at 1000°C - 1300°C;

[0025] S3: The sintered metal products move with the material storage rack to the heat preservation area, and then move to the cooling area. The metal products are cooled in the cooling area and finally removed from the end of the discharging conveying assembly.

[0026] In summary, the present invention mainly has the following beneficial effects:

[0027] 1. In the present invention, by providing secondary furnace channels on both sides of the main furnace channel, and then setting the traditional linear roller-type feeding mechanism as a U-shaped roller-type feeding mechanism, the U-shaped roller-type feeding mechanism includes a feeding conveying assembly, a turning conveying assembly, and a discharging conveying assembly;

[0028] The feeding conveying assembly is located in the main furnace and is used for preheating and sintering metal products. The steering conveying assembly is set as a heat preservation zone. Compared with the traditional linear roller sintering furnace, its cooling zone (equivalent to the position of the heat preservation zone in this application) is located at the end of the sintering zone. In actual applications, in order to improve the cooling efficiency of metal products, a cooling system is usually set at the position of the cooling zone in the sintering furnace to improve the cooling efficiency of metal products. In order to facilitate the passage of metal products, the linear roller sintering furnace has a channel for entering and exiting materials between the sintering zone and the cooling zone, which will cause a large amount of heat from the sintering zone to be lost to the cooling zone, resulting in energy waste. In this application, a heat preservation zone is added at the position of the steering conveying assembly. The temperature of the heat preservation zone is lower than that of the sintering zone, which can avoid cracking caused by a sudden drop in the temperature of the metal product.

[0029] The discharge conveying assembly is placed in the auxiliary furnace channel as a cooling zone, so that the temperature lost through the outer wall of the traditional furnace channel can be transferred to the auxiliary furnace channel. The design of the auxiliary furnace channel not only plays the role of heat preservation of the main furnace channel, but also the auxiliary furnace channel is used as a cooling zone. Compared with the traditional cooling zone, the length is longer, and the heat lost in the main furnace channel can be used to insulate and naturally cool the metal products.

[0030] 2. The present invention can reduce heat loss due to the connection of transmission components by setting up independent transmission systems for the feed conveying assembly, steering conveying assembly and discharging conveying assembly of the roller feeding mechanism. In actual applications, the roller of the roller sintering furnace often adopts the same structure as the second transmission system in the present application to drive the roller, resulting in that the heat in the furnace body will flow to the second transmission system through the roller, which will not only reduce the service life of the second transmission system but also cause energy waste. In the present application, a group of rollers of the feed conveying assembly and a group of rollers of the discharging conveying assembly are connected by setting up multiple groups of third transmission assemblies. It is difficult for the heat of the rollers of the feed conveying assembly to be transferred to the rollers of the discharging conveying assembly through the third transmission assembly. Moreover, the feed conveying assembly and the discharging conveying assembly are respectively located in two furnaces. The temperature of the auxiliary furnace as a cooling zone is relatively low, and the temperature influence of the second transmission system is also reduced, thereby extending the service life of the equipment components.

[0031] 3. The present invention provides a V-shaped rack for holding metal products, so that the sintering of metal products is more uniform. An arched seat is provided inside the V-shaped rack to support the metal products, and the arc length of the arched seat matches the width of the metal products. This ensures that when the metal products are overlapped on the arched seat, only a small part of the side of the metal products is in contact with the arched seat, so that most of the area of the metal products can be sintered at high temperature. When the metal products are deflected and moved in the V-shaped rack, most of the area on the other side of the metal products can be sintered at high temperature. Such a sintering method can make the metal products sintered in all directions, thereby improving the sintering quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0033] Figure 2 It is a schematic diagram of the internal structure of the metal sintering furnace of the present invention;

[0034] Figure 3 It is a structural schematic diagram of the roller feeding mechanism of the present invention;

[0035] Figure 4 For the present invention Figure 3 A in the enlarged view;

[0036] Figure 5 It is a schematic structural diagram of a third transmission system of the present invention;

[0037] Figure 6 It is a schematic diagram of the structure of the material holding rack of the present invention;

[0038] Figure 7 It is a schematic diagram of the structure of the V-shaped storage rack of the present invention;

[0039] Figure 8 It is a side view of the V-shaped storage rack of the present invention.

[0040] Description of reference numerals:

[0041] 1. Metal sintering furnace; 101. Main furnace; 102. Pre-sintering zone; 103. Sintering zone; 104. Insulation zone; 105. First insulation board; 106. Second insulation board; 107. Flame-spraying assembly; 108. Secondary furnace; 109. Cooling zone; 110. Third insulation board; 111. Fuel delivery pipeline; 2. Roller feeding mechanism; 201. Feeding conveying assembly; 202. Turning conveying assembly; 203. Discharging conveying assembly; 204. Roller; 205. First sprocket assembly; 206. First transmission system; 2 07. Second transmission system; 2071. Driving device; 2072. First transmission shaft; 2073. Second transmission shaft; 2074. Bevel gear set; 2075. Second sprocket assembly; 208. Third transmission system; 2081. Third transmission shaft; 2082. Straight gear set; 2083. Third sprocket assembly; 3. Material holding rack; 301. Chassis; 302. First pulley; 303. Handrail; 304. Movable rack; 305. Second pulley; 306. V-shaped rack; 307. Arch seat; 4. Arc plate. DETAILED DESCRIPTION

[0042] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0043] The embodiments of the present invention will be described below according to its overall structure.

[0044] Please refer to Figure 1 - Figure 8 A metal powder metallurgy sintering furnace, the metal sintering furnace 1 includes a main furnace path 101, and a pre-burning area 102, a sintering area 103 and a heat preservation area 104 are sequentially arranged inside the main furnace path 101. Spraying components 107 are arranged in both the pre-burning area 102 and the sintering area 103. Side furnace paths 108 are arranged on both sides of the main furnace path 101. A roller-type feeding mechanism 2 is arranged inside the metal sintering furnace 1. The roller-type feeding mechanism 2 includes a feeding conveying component 201, a turning conveying component 202 and a discharging conveying component 203. The feeding conveying component 201 includes multiple groups of rollers 204. For the multiple groups of rollers 204 located in the feeding conveying component 201, adjacent two groups of rollers 204 are connected by a first sprocket component 205 in a transmission manner. The turning conveying component 202 also includes multiple groups of rollers 204, and the multiple groups of rollers 204 located in the turning conveying component 202 are connected to a first transmission system 206. The discharging conveying component 203 also includes multiple groups of rollers 204, and the multiple groups of rollers 204 located in the discharging conveying component 203 are connected to a second transmission system 207. One group of rollers 204 in the feeding conveying component 201 and one group of rollers 204 in the discharging conveying component 203 are connected by a third transmission system 208 in a transmission manner. By arranging the side furnace paths 108 on both sides of the main furnace path 101, the side furnace paths 108 can be used to keep the main furnace path 101 warm and save heat energy. The U-shaped roller-type feeding mechanism 2 is arranged, so that metal products can be fed and then reciprocated to complete discharging. This is not only convenient for workers to load and unload materials at the same working location, but also a heat preservation area 104 and an extended cooling area 109 can be added to the metal sintering furnace 1. The heat preservation area 104 can reduce the temperature of the metal products to achieve the purpose of heat preservation and cooling, and avoid the metal products from cracking due to sudden temperature drop. The cooling area 109 is located on the side of the main furnace path 101, and its temperature is further reduced compared with the heat preservation area 104. The heat lost by the main furnace path 101 is used to further keep the metal products warm and cool.

[0045] In the above embodiment, specifically, please refer to Figure 2 Cooling areas 109 are arranged in both groups of side furnace paths 108. A first heat insulation board 105 is arranged between the pre-burning area 102 and the sintering area 103, a second heat insulation board 106 is arranged between the sintering area 103 and the heat preservation area 104, and the second heat insulation board 106 extends between the heat preservation area 104 and the cooling area 109. A third heat insulation board 110 is arranged between the main furnace path 101 and the two groups of side furnace paths 108. By arranging multiple heat insulation boards, the heat exchange between the pre-burning area 102, the sintering area 103, the heat preservation area 104 and the cooling area 109 of the metal sintering furnace 1 is reduced.

[0046] In the above embodiments, specifically, please refer to Figure 2 , the number of the flame spraying components 107 in the pre-sintering area 102 is less than that in the sintering area 103. A fuel delivery pipeline 111 is arranged on one side of the main furnace passage 101. By arranging a small number of flame spraying components 107 in the pre-sintering area 102, the temperature of the pre-sintering area 102 can reach the preheating temperature, and by arranging more flame spraying components 107 in the sintering area 103, the temperature of the sintering area 103 can reach the sintering temperature. The fuel delivery pipeline 111 is used to deliver fuel to the flame spraying components 107, such as; a metal combustion furnace using hydrogen as an energy source.

[0047] In the above embodiments, specifically, please refer to Figure 3 and Figure 4 , the first drive system 206 and the second drive system 207 work in the same way. The second drive system 207 includes a driving device 2071, and the output end of the driving device 2071 is connected to a first transmission shaft 2072. And the first transmission shaft 2072 is connected to a plurality of second transmission shafts 2073 through a plurality of bevel gear sets 2074. The ends of the plurality of second transmission shafts 2073 are all connected to second sprocket assemblies 2075, and the plurality of second sprocket assemblies 2075 are connected to the plurality of rollers 204 of the discharge conveying assembly 203. By arranging the first drive system 206 to drive the steering conveying assembly 202 to work, the space where the steering conveying assembly 202 is located is the heat preservation area 104. The temperature of the heat preservation area 104 mainly comes from the heat transfer of the sintering area 103, and the temperature is lower than that of the sintering area 103. Therefore, less heat of the heat preservation area 104 is lost through the first drive system 206. The second drive system 207 is arranged to drive the discharge conveying assembly 203. The space where the discharge conveying assembly 203 is located is the cooling area 109. The temperature of the cooling area 109 mainly comes from the heat transfer of the sintering area 103 and the heat preservation area 104, and the temperature will be further reduced. Therefore, less heat of the two cooling areas 109 is lost through the second drive system 207.

[0048] In the above embodiments, specifically, please refer to Figure 3 and Figure 5, there are multiple sets of the third transmission system 208. The third transmission system 208 includes a third transmission shaft 2081. One end of the third transmission shaft 2081 is provided with a spur gear set 2082, and the spur gear set 2082 is connected to the roller 204 of the feeding and conveying assembly 201. The other end of the third transmission shaft 2081 is provided with a third sprocket assembly 2083, and the third sprocket assembly 2083 is connected to the roller 204 of the discharging and conveying assembly 203. By setting multiple sets of the third transmission system 208 to connect the feeding and conveying assembly 201 and the discharging and conveying assembly 203, the running directions of the two are opposite, and the number of the third transmission system 208 is set to ensure that the roller-type feeding mechanism 2 can operate stably, reducing the heat transfer from the roller 204 of the feeding and conveying assembly 201 to the roller 204 of the discharging and conveying assembly 203, and reducing the loss of the temperature of the main furnace track 101.

[0049] In the above embodiment, specifically, please refer to Figure 6 , there are two sets of roller-type feeding mechanisms 2 symmetrically arranged, and arc-shaped plates 4 are provided on the tops of the two sets of roller-type feeding mechanisms 2, and multiple sets of material holding racks 3 are provided on the tops of the two sets of roller-type feeding mechanisms 2. By setting two sets of roller-type feeding mechanisms 2, not only can the working efficiency be increased, but the two sets of roller-type feeding mechanisms 2 are arranged to match the two sets of auxiliary furnace tracks 108, and the two sets of auxiliary furnace tracks 108 can insulate the two sides of the main furnace track 101.

[0050] In the above embodiment, specifically, please refer to Figure 6 , the material holding rack 3 includes a chassis 301, and multiple sets of first pulleys 302 are provided on the side of the chassis 301, and handrails 303 are provided on both sides of the chassis 301. An activity rack 304 is rotatably connected to the top of the chassis 301, and multiple sets of second pulleys 305 are provided at the bottom of the activity rack 304, and multiple sets of V-shaped object placing racks 306 for holding metal products are provided on the top of the activity rack 304. By setting the movable material holding rack 3 to act with the arc-shaped plate 4, the metal product can deflect the angle in the V-shaped object placing rack 306.

[0051] In the above embodiment, specifically, please refer to Figure 8 , an arched seat 307 is arranged inside the V-shaped object placing rack 306, and the arc length of the arched seat 307 matches the width of the metal product. By setting the arched seat 307 that matches the width of the metal product, not only can it be used to support the metal product, but also more than half of the area of the metal product can directly contact the heat source. Furthermore, after the metal product deflects, the other side of the metal product contacts the heat source, enabling the metal product to be sintered evenly and increasing the sintering temperature.

[0052] A sintering method using a metal powder metallurgy sintering furnace, the process of which includes the following steps:

[0053] S1: The metal sintering furnace 1 is in the working state. First, the staff stack multiple groups of metal products to be sintered in the material storage rack 3 as a whole, and then place the material storage rack 3 filled with metal products on the top of the roller 204 of the feeding conveyor component 201, and the material storage rack 3 is placed against one side of the arc-shaped plate 4 when placing;

[0054] S2: Start the roller-type feeding mechanism 2. The material storage rack 3 is transported into the pre-sintering area 102 of the metal sintering furnace 1, and the metal products are pre-heated at 400°C - 600°C. Then the material storage rack 3 is transported into the sintering area 103 of the metal sintering furnace 1, and one side of the metal products is sintered at a high temperature of 1000°C - 1300°C. The material storage rack 3 continues to move to the position of the arc-shaped plate 4, and the arc-shaped plate 4 will lift the part above the movable frame 304 of the material storage rack 3, so that multiple groups of metal products deflect and move, and then the other side of the metal products undergoes high-temperature sintering at 1000°C - 1300°C;

[0055] S3: The sintered metal products move with the material storage rack 3 into the heat preservation area 104, and then move into the cooling area 109. The metal products are cooled in the cooling area 109 and finally removed from the end of the discharging conveyor component 203.

[0056] When the present invention is working specifically: First, ensure that the metal sintering furnace 1 is in a startup state. Then, the staff evenly stack the metal products to be sintered in multiple groups of material storage racks 3, and place the multiple groups of material storage racks 3 on the tops of two sets of roller-type feeding mechanisms 2 respectively. Start the first drive system 206 and the second drive system 207 of the roller-type feeding mechanism 2. The first drive system 206 drives the steering conveying component 202 to work, and the second drive system 207 drives the discharging conveying component 203 to work. Moreover, the discharging conveying component 203 drives the feeding conveying component 201 to work through the third drive system 208. The material storage rack 3 containing the metal products first enters the pre-sintering area 102, and the metal products are pre-heated at 400°C - 600°C. Then, they enter the sintering area 103. One side of the metal products is sintered at a high temperature of 1000°C - 1300°C. When the material storage rack 3 moves to the position of the arc plate 4, the second pulley 305 at the bottom of the movable frame 304 of the material storage rack 3 rolls and rises along the arc plate 4, causing the movable frame 304 to rotate by a certain angle. Further, the multiple groups of V-shaped storage racks 306 at the top of the movable frame 304 are inclined. The inclination of the multiple groups of V-shaped storage racks 306 causes the metal products stacked in the V-shaped storage racks 306, such as gears, to deflect and move along the arched seat 307. Further, the other side of the metal products is sintered at a high temperature of 1000°C - 1300°C. The sintered metal products move with the material storage rack 3 to the top of the steering conveying component 202. The work of the steering conveying component 202 changes the movement direction of the material storage rack 3, making it enter the heat preservation area 104. The temperature in the heat preservation area 104 is lower than that in the sintering area 103, enabling the metal products to be cooled in the heat preservation area 104. Then, the metal products move with the material storage rack 3 into the cooling area 109, that is, the auxiliary furnace track 108. The temperature in the cooling area 109 will be further reduced, and the metal products are further cooled in the cooling area 109. Finally, they move to the end of the discharging conveying component 203 for the staff to unload the materials.

[0057] Although the embodiments of the present invention have been shown and described, the specific embodiments are only explanations of the present invention and do not limit the invention. The specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. After reading this specification, those skilled in the art can make modifications, substitutions and variations that do not contribute creatively to the embodiments according to needs, but as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

Claims

1. A metal powder metallurgy sintering furnace, characterized in that: The metal powder metallurgy sintering furnace (1) includes a main furnace channel (101), and a pre-sintering zone (102), a sintering zone (103), and a heat preservation zone (104) are sequentially arranged inside the main furnace channel (101). Spraying components (107) are arranged in both the pre-sintering zone (102) and the sintering zone (103). Side furnace channels (108) are arranged on both sides of the main furnace channel (101). A roller-type feeding mechanism (2) is arranged inside the metal powder metallurgy sintering furnace (1). The roller-type feeding mechanism (2) includes a feeding conveying component (201), a turning conveying component (202), and a discharging conveying component (203). The feeding conveying component (201) includes multiple groups of rollers (204). For the multiple groups of rollers (204) located inside the feeding conveying component (201), adjacent two groups of rollers (204) are connected in a driving manner through a first sprocket assembly (205). The turning conveying component (202) also includes multiple groups of rollers (204), and a first transmission system (206) is connected to the multiple groups of rollers (204) located inside the turning conveying component (202). The discharging conveying component (203) also includes multiple groups of rollers (204), and a second transmission system (207) is connected to the multiple groups of rollers (204) located inside the discharging conveying component (203). One group of rollers (204) inside the feeding conveying component (201) and one group of rollers (204) inside the discharging conveying component (203) are connected in a driving manner through a third transmission system (208).

2. The metal powder metallurgy sintering furnace according to claim 1, wherein: Cooling zones (109) are arranged in both of the two side furnace channels (108). A first heat insulation board (105) is arranged between the pre-sintering zone (102) and the sintering zone (103), and a second heat insulation board (106) is arranged between the sintering zone (103) and the heat preservation zone (104). Moreover, the second heat insulation board (106) extends between the heat preservation zone (104) and the cooling zone (109). A third heat insulation board (110) is arranged between the main furnace channel (101) and the two side furnace channels (108).

3. A metal powder metallurgy sintering furnace according to claim 2, characterized in that: The number of spraying components (107) in the pre-sintering zone (102) is less than that in the sintering zone (103). A fuel conveying pipeline (111) is arranged on one side of the main furnace channel (101).

4. A metal powder metallurgy sintering furnace according to claim 3, characterized in that: The working modes of the first transmission system (206) and the second transmission system (207) are the same. The second transmission system (207) includes a driving device (2071), and the output end of the driving device (2071) is connected to a first transmission shaft (2072). Moreover, the first transmission shaft (2072) is connected to multiple groups of second transmission shafts (2073) through multiple groups of bevel gear sets (2074). The ends of the multiple groups of second transmission shafts (2073) are all connected to second sprocket assemblies (2075), and the multiple groups of second sprocket assemblies (2075) are connected to the multiple groups of rollers (204) of the discharging conveying component (203).

5. The metal powder metallurgy sintering furnace according to claim 4, wherein: A plurality of groups of the third transmission system (208) are provided. The third transmission system (208) includes a third transmission shaft (2081). One end of the third transmission shaft (2081) is provided with a spur gear set (2082), and the spur gear set (2082) is connected to a roller (204) of the feeding and conveying assembly (201). The other end of the third transmission shaft (2081) is provided with a third sprocket assembly (2083), and the third sprocket assembly (2083) is connected to a roller (204) of the discharging and conveying assembly (203).

6. A metal powder metallurgy sintering furnace according to claim 5, characterized in that: Two groups of the roller-type feeding mechanisms (2) are symmetrically provided. Arc-shaped plates (4) are provided at the tops of the two groups of roller-type feeding mechanisms (2), and a plurality of groups of material storage racks (3) are provided at the tops of the two groups of roller-type feeding mechanisms (2).

7. A metal powder metallurgy sintering furnace according to claim 6, characterized in that: The material storage rack (3) includes a chassis (301). A plurality of first pulleys (302) are provided on the side surface of the chassis (301), and handrails (303) are provided on both sides of the chassis (301). A movable frame (304) is rotatably connected to the top of the chassis (301). A plurality of second pulleys (305) are provided at the bottom of the movable frame (304), and a plurality of V-shaped storage racks (306) for storing metal products are provided at the top of the movable frame (304).

8. A metal powder metallurgy sintering furnace according to claim 7, characterized in that: An arched seat (307) is provided inside the V-shaped storage rack (306), and the arc length of the arched seat (307) matches the width of the metal product.

9. A sintering method using a metal powder metallurgy sintering furnace, characterized in that Using a metal powder metallurgy sintering furnace described in claim 8, the process includes the following steps: S1: The metal powder metallurgy sintering furnace (1) is in a working state. First, the staff stacks a plurality of groups of metal products to be sintered in the material storage rack (3) as a whole, and then places the material storage rack (3) filled with metal products on the top of the roller (204) of the feeding and conveying assembly (201), and the material storage rack (3) abuts against one side of the arc-shaped plate (4) when placed. S2: Start the roller-type feeding mechanism (2). The material storage rack (3) is transported into the pre-sintering area (102) of the metal powder metallurgy sintering furnace (1). The metal products are pre-heated at 400°C - 600°C. Then the material storage rack (3) is transported into the sintering area (103) of the metal powder metallurgy sintering furnace (1). One side surface of the metal products is sintered at a high temperature of 1000°C - 1300°C. The material storage rack (3) continues to move to the position of the arc-shaped plate (4). The arc-shaped plate (4) will lift the part above the movable frame (304) of the material storage rack (3), so that a plurality of groups of metal products deflect and move, and then the other side surface of the metal products undergoes high-temperature sintering at 1000°C - 1300°C. S3: The sintered metal products move with the material storage rack (3) into the heat preservation area (104), and then move into the cooling area (109). The metal products are cooled in the cooling area (109), and finally are removed from the end of the discharging and conveying assembly (203).

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