Automatic processing equipment and process for friction material of torque limiter

Abstract

The invention belongs to the technical field of torque limiter machining, and particularly discloses equipment for automatically machining a friction material of a torque limiter. The torque limiter friction plate is connected with the sintering fireplace, and a multi-section heating assembly and a fireplace heat preservation assembly are arranged in the sintering fireplace. The multi-section heating assembly comprises a sintering structure and a high-frequency heating structure, a core porous structure is preferentially processed through flame calcination, metal particles of a material core are preliminarily diffused to form a porous framework, then the surface layer performance is precisely enhanced in combination with high-frequency heating, gradient heating is conducted through high-frequency heating, and the surface layer performance is improved. A continuous transition density gradient can be formed between the surface layer and the core part through precise temperature control of high-frequency heating, and the fatigue resistance and friction stability are improved; the fireplace heat preservation assembly collects heat lost by flame sintering and high-frequency heating, the heat lost by flame sintering and high-frequency heating is collected and stored through the liquid metal sodium, and the liquid metal sodium forms a plurality of heat preservation layers on the outer side of the sintering fireplace to improve the heat preservation performance of the sintering fireplace.

Description

Technical Field

[0001] The present invention relates to the technical field of torque limiter processing, and specifically to an automatic processing equipment and process for torque limiter friction materials. Background Art

[0002] The torque limiter friction plate is a key functional component used in mechanical transmission systems. It is usually made of metal-based (such as copper-based, iron-based), ceramic composite materials or resin-based materials, and has high wear resistance, high temperature resistance and a stable friction coefficient. Its core function is to achieve torque limitation through controllable friction slip when the transmission system is overloaded, thereby protecting the equipment from damage. The surface of the friction plate is often designed with micro-grooves or coatings to optimize heat dissipation and lubrication, and the internal pore structure can be impregnated with lubricants to reduce wear. It is widely used in automotive clutches, wind power braking systems, industrial machine tools and other scenarios to ensure smooth transmission, sensitive response and long service life. In the prior art, the sintering process of torque limiter friction plates mostly uses a single heating method (such as pure flame or pure high-frequency induction), which has defects such as rough temperature control, low energy utilization rate, and insufficient material property stratification: traditional flame sintering, although low in cost, has uneven heating between the core and the surface layer, making it difficult to form a gradient pore structure; high-frequency heating, although fast in heating up, is prone to overburning of the surface layer and under-sintering of the core due to the skin effect, and the waste heat is not effectively recovered, resulting in high energy consumption and serious furnace body heat dissipation. Summary of the Invention

[0003] The purpose of the present invention is to provide an automatic processing equipment and process for torque limiter friction materials to solve the problems of uneven heating between the core and the surface layer, making it difficult to form a gradient pore structure; high-frequency heating, although fast in heating up, is prone to overburning of the surface layer and under-sintering of the core.

[0004] To achieve the above purpose, the present invention provides the following technical solution: An automatic processing equipment for torque limiter friction materials, including;

[0005] A torque limiter friction plate and a sintering furnace. The torque limiter friction plate is located inside the sintering furnace for high-temperature sintering. The inside of the sintering furnace has a multi-stage heating component and a furnace heat preservation component;

[0006] The multi-stage heating component includes a sintering structure and a high-frequency heating structure. The core porous structure is preferentially treated by flame calcination to initially diffuse the metal particles in the core of the material to form a porous skeleton, and then the surface layer performance is precisely strengthened by combining high-frequency heating. High-frequency induction heating rapidly heats up the surface layer to form a dense wear-resistant layer. At the same time, the core is prevented from overburning through the skin effect, and high-frequency heating can perform gradient heating. The precise temperature control of high-frequency heating can form a continuous transition density gradient between the surface layer and the core, improving fatigue resistance and friction stability;

[0007] The fireplace heat insulation component collects the heat lost during flame sintering and high-frequency heating. The heat lost during flame sintering and high-frequency heating is collected and stored by liquid metal sodium. Multiple heat insulation layers are formed on the outer side of the sintering fireplace by liquid metal sodium to improve the heat insulation performance of the sintering fireplace, which can reduce the heat radiation and convective heat dissipation on the furnace body surface and reduce energy loss.

[0008] Preferably, the fireplace heat insulation component includes heat insulation layer A, heat insulation pipe, heat insulation layer B, heat insulation tank, and high-temperature liquid sodium pump; heat insulation layer A is wrapped around the outer side of the sintering fireplace, and the inside of heat insulation layer A is a hollow structure. Liquid metal sodium is filled inside heat insulation layer A, and the heat insulation pipe is wound around the outer side of heat insulation layer A. Heat insulation layer B is wrapped around the heat insulation pipe. One end of the bottom of the heat insulation pipe extends into the inside of heat insulation layer A, and one end of the top of the heat insulation pipe is connected to a return pipe. The end of the return pipe far from heat insulation layer A is connected to the heat insulation tank. The high-temperature liquid sodium pump is located at the bottom of the heat insulation tank, and an output pipe is connected to the high-temperature liquid sodium pump. The end of the output pipe far from the high-temperature liquid sodium pump is inserted into the top of heat insulation layer A. The liquid metal sodium outside the sintering fireplace absorbs the heat energy emitted by the sintering fireplace, and the sintering fireplace is heat-insulated by the heated liquid metal sodium, thereby reducing energy loss. Moreover, a secondary heat insulation layer is formed by the heat insulation pipe wound around the outer side of heat insulation layer A, thereby reducing the heat loss of the liquid metal sodium. The heated liquid metal sodium inside heat insulation layer A is transported to the inside of the heat insulation tank through the heat insulation pipe, increasing the capacity of the heated liquid metal sodium, making the retention time of the high-temperature liquid metal sodium inside heat insulation layer A increase, making the heat loss slower after the heating inside the sintering fireplace stops, making the cooling speed of the torque limiter friction plate decrease, and making the hardened layer formed inside the torque limiter friction plate more stable. And the liquid metal sodium stored inside the heat insulation tank is transported to heat insulation layer A through the high-temperature liquid sodium pump for reflux, promoting that all the liquid metal sodium can be evenly heated and making the temperature of the liquid metal sodium stable and uniform.

[0009] Preferably, there are multiple annularly distributed heat exchange pipes on the inner side of the sintering fireplace. The inside of the heat exchange pipes is a hollow structure. Both ends of the heat exchange pipes are communicated with the inside of heat insulation layer A, and the heat exchange pipes are made of brass. The heat exchange pipes made of brass have a high heat energy conversion rate. After absorbing heat through the heat exchange pipes, the heat is transferred to the liquid metal sodium inside, thereby accelerating the heating of the liquid metal sodium.

[0010] Preferably, the heat insulation tank is a double-layer structure, and there is a spacing between the inner liner layer and the outer heat insulation layer. There is a vacuum layer between the inner liner layer and the heat insulation layer. The double-layer structure design can greatly improve the heat insulation performance and reduce the heat loss speed.

[0011] Preferably, the interior of the sintering fireplace has a support structure, which includes a sintering rack, a connecting piece, and a lower support pillar; the torque limiter friction plate is attached to the top of the sintering rack, and gaskets are buckled on both sides of the sintering rack. The two gaskets are buckled to form a circular ring, and the diameter of the gasket is larger than that of the torque limiter friction plate. The top of the gasket is attached to the outside of the torque limiter friction plate. After the torque limiter friction plate is sintered, the two gaskets are separated and removed, so that the periphery of the torque limiter friction plate is suspended, facilitating the removal of the torque limiter friction plate;

[0012] Preferably, the bottom of the sintering rack is a hollow structure. The top of the connecting piece is embedded in the bottom of the sintering rack. The inside of the connecting piece is a hollow structure. The top of the lower support pillar is embedded in the inside of the connecting piece. A plurality of through holes are annularly formed at the top of the connecting piece. The connecting piece is made of polyetherimide plastic, which has good high-temperature resistance. When hitting the middle of the sintering rack downward, the connecting piece is stressed, and the connecting piece breaks at the position of the annular through hole, causing the lower support pillar to push upward, so that the lower support pillar passes through the connecting piece and is embedded in the inside of the sintering rack, causing the sintering rack to drop with the torque limiter friction plate. The connecting piece is a disposable part and can be replaced after each sintering. The replaced connecting piece can collect materials for reshaping.

[0013] Preferably, the sintering structure includes an air inlet ring and sintering nozzles; the air inlet ring is located at a position close to the top of the sintering fireplace. The air inlet ring and the sintering fireplace are coaxial. A plurality of sintering nozzles are annularly installed on the inner side of the air inlet ring. Each sintering nozzle has an inclination angle, and a plurality of flow guiding plates are provided on the top of the sintering rack. There is a spacing between every two flow guiding plates. The torque limiter friction plate is heated and sintered by the flames ejected from the plurality of sintering nozzles. Flame sintering transfers heat through radiation and convection, evenly covering a large surface area. The heating rate of flame sintering is slow, which is beneficial to the volatilization of lubricants and the uniform formation of pores. After the porous core is impregnated with lubricants, the fluctuation range of the friction coefficient is reduced. Slowly heating can avoid microcracks caused by thermal expansion differences of powder particles and improve the qualification rate of green body sintering. The top of the air inlet ring has an energy supply pipeline, and a gas tank is connected to the energy supply pipeline;

[0014] Preferably, the flames ejected by the annularly distributed sintering nozzles cause the flow guiding plates to be stressed, causing the sintering rack to rotate on the lower support pillar. Through rotation, the torque limiter friction plate rotates and is sintered, making the torque limiter friction plate heat more evenly;

[0015] Preferably, the sintering rack, the flow guiding plates, the lower support pillar, and the gaskets are made of silicon nitride ceramic materials and are not affected by high-frequency heating.

[0016] Preferably, the high-frequency heating structure includes a high-frequency heating coil and a high-frequency heating main unit; the diameter of the high-frequency heating coil is larger than that of the friction disc of the torque limiter, and the high-frequency heating coil is located near the bottom inside the sintering furnace. Both ends of the high-frequency heating coil pass through the sintering furnace, insulation layer A, and insulation layer B and extend to the outside of insulation layer B. Local protective layers are arranged inside insulation layer A and insulation layer B on the outer sides of both ends of the high-frequency heating coil to prevent liquid sodium metal from contacting the high-frequency heating coil. Both ends of the high-frequency heating coil are connected to the high-frequency heating main unit. Through the collaborative process of flame pre-burning to remove impurities and porousization and high-frequency final sintering surface strengthening, the material properties are precisely regulated in stages, significantly improving the comprehensive performance of the friction disc. Flame pre-burning removes lubricants at low cost and forms a porous structure in the core. Subsequently, high-frequency final sintering uses the skin effect to quickly densify the surface layer, enabling strong bonding between hard particles and the matrix, achieving high hardness and wear resistance. Under the synergy of the two stages, the fluctuation of the friction coefficient is reduced, the production cycle is shortened, and energy consumption is reduced. At the same time, the toughness of the core, heat dissipation, and surface anti-fatigue performance are taken into account.

[0017] Preferably, the inner side of the sintering furnace has a mask for heat insulation to prevent the flame from contacting the intake ring. The top of the sintering furnace has an upper cover that buckles on the top of the mask to isolate the flame. The bottom of insulation layer B has a fixedly connected bottom plate, and a lower cover is attached to the bottom of the bottom plate. There are two symmetric bumps on both sides of the lower cover, and two inverted buckles are arranged at the bottom of the bottom plate. The lower cover can be rotated at the bottom of the bottom plate to be snap-connected and limited with the bottom plate to seal the sintering furnace. The top of the lower cover has a snap ring, and the bottom of the lower support pillar is embedded inside the snap ring for position limitation.

[0018] Preferably, a process for automatically processing a torque limiter friction material includes the following steps:

[0019] Step 1: Raw material mixing, mixing according to the proportion of the base material of the torque limiter friction disc;

[0020] Step 2: Cold pressing and forming, pressing the mixed material into the shape of the torque limiter friction disc through hydraulic pressure and a pressure plate;

[0021] Step 3: Flame sintering, putting the cold-pressed torque limiter friction disc into the sintering furnace and calcining it with a flame to preferentially process the porous structure in the core, enabling the metal particles in the core of the material to initially diffuse and form a porous framework;

[0022] Step 4: High-frequency heating and calcining, precisely strengthening the surface layer performance by high-frequency heating. High-frequency induction heating rapidly raises the temperature of the surface layer. The precise temperature control of high-frequency heating can form a continuous transitional density gradient between the surface layer and the core, improving the anti-fatigue property and friction stability.

[0023] Compared with the prior art, the beneficial effects of the present invention are:

[0024] 1. First, preferentially process the porous structure in the core by flame calcination to initially diffuse the metal particles in the core of the material to form a porous skeleton. Then, combine high-frequency heating to precisely strengthen the surface performance. The high-frequency induction heating rapidly raises the temperature of the surface layer to form a dense wear-resistant layer. At the same time, the skin effect is used to avoid overheating of the core. Moreover, high-frequency heating can perform gradient heating, and the precise temperature control of high-frequency heating can form a continuous transitional density gradient between the surface layer and the core, improving the fatigue resistance and friction stability.

[0025] 2. The fireplace thermal insulation component collects the heat lost during flame sintering and high-frequency heating. The heat lost during flame sintering and high-frequency heating is collected and stored by liquid sodium metal. Multiple thermal insulation layers are formed on the outside of the sintering fireplace by liquid sodium metal to improve the thermal insulation performance of the sintering fireplace, which can reduce the heat radiation and convective heat dissipation on the surface of the furnace body and reduce energy loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a three-dimensional structural schematic diagram of the present invention;

[0027] Figure 2 It is an internal structural schematic diagram of the present invention;

[0028] Figure 3 It is an exploded structural schematic diagram of the fireplace thermal insulation component of the present invention;

[0029] Figure 4 It is a top exploded schematic diagram of the support structure of the present invention;

[0030] Figure 5 It is a bottom exploded schematic diagram of the support structure of the present invention;

[0031] Figure 6 It is of the present invention Figure 2 The enlarged structural schematic diagram of part A in it.

[0032] In the figure: 100, sintering fireplace; 101, intake ring; 102, sintering nozzle; 103, mask; 104, heat exchange tube; 105, upper cover;

[0033] 200, thermal insulation layer A; 201, thermal insulation pipe; 202, thermal insulation layer B; 203, bottom plate; 204, lower cover;

[0034] 300, thermal insulation tank; 301, high-temperature liquid sodium pump; 302, output pipe; 303, return pipe;

[0035] 400, sintering rack; 401, flow guide plate; 402, connecting piece; 403, lower support;

[0036] 500, high-frequency heating coil;

[0037] 600, torque limiter friction plate; 601, gasket. Detailed implementation mode

[0038] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0039] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "vertical", "upper", "lower", "horizontal", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0040] In the description of the present invention, it should also be noted that unless otherwise clearly specified and defined, the terms "set", "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0041] Embodiment 1: Please refer to Figures 1-6 , the present invention provides a technical solution: a device for automatically processing the friction material of a torque limiter, including;

[0042] The friction plate 600 of the torque limiter is inside the sintering furnace 100 for high-temperature sintering. The interior of the sintering furnace 100 has a multi-stage heating component and a furnace heat preservation component. The multi-stage heating component includes a sintering structure and a high-frequency heating structure. The core porous structure is preferentially treated by flame calcination to initially diffuse the metal particles in the core of the material to form a porous skeleton, and then the surface performance is precisely strengthened by combining high-frequency heating. The high-frequency induction heating rapidly raises the temperature of the surface layer to form a dense wear-resistant layer. At the same time, the skin effect is used to avoid overburning of the core, and the high-frequency heating can perform gradient heating. The precise temperature control of the high-frequency heating can form a continuous transitional density gradient between the surface layer and the core, improving the fatigue resistance and friction stability. The sintering structure includes an air inlet ring 101 and a sintering nozzle 102. The air inlet ring 101 is located near the top of the sintering furnace 100. The air inlet ring 101 and the sintering furnace 100 are coaxial. A plurality of sintering nozzles 102 are annularly installed on the inner side of the air inlet ring 101. Each sintering nozzle 102 has an inclination angle, and the top of the sintering rack 400 has a plurality of flow guide plates 401. There is a spacing between every two flow guide plates 401. The friction plate 600 of the torque limiter is heated and sintered by the flames ejected by the plurality of sintering nozzles 102. The flame sintering transfers heat through radiation and convection, evenly covering a large surface area. The heating rate of the flame sintering is slow, which is beneficial to the volatilization of the lubricant and the uniform formation of pores. After the porous core is impregnated with the lubricant, the fluctuation range of the friction coefficient is reduced. The slow heating rate avoids the generation of microcracks due to the thermal expansion difference of the powder particles, improving the qualification rate of the green body sintering. The top of the air inlet ring 101 has an energy supply pipeline, and a gas tank is connected to the energy supply pipeline;

[0043] Furthermore, the flames ejected by the annularly distributed sintering nozzles 102 act on the flow guide plates 401, causing the sintering rack 400 to rotate on the lower support column 403. The rotation causes the friction plate 600 of the torque limiter to rotate and sinter, making the friction plate 600 of the torque limiter heat more evenly;

[0044] Furthermore, the high-frequency heating structure includes a high-frequency heating coil 500 and a high-frequency heating main unit; the diameter of the high-frequency heating coil 500 is larger than that of the torque limiter friction plate 600, and the high-frequency heating coil 500 is located near the bottom inside the sintering furnace 100. Both ends of the high-frequency heating coil 500 pass through the sintering furnace 100, the thermal insulation layer A 200, and the thermal insulation layer B 202 and extend to the outside of the thermal insulation layer B 202. And the outer sides of both ends of the high-frequency heating coil 500 are located in the internal local protective layer of the thermal insulation layer A 200 and the thermal insulation layer B 202. The protective layer prevents liquid sodium metal from contacting the high-frequency heating coil 500. And both ends of the high-frequency heating coil 500 are connected to the high-frequency heating main unit. Through the collaborative process of flame pre-burning to remove impurities and porousization and high-frequency final sintering surface strengthening, the material properties are precisely regulated in stages, significantly improving the comprehensive performance of the friction plate. The flame pre-burning removes lubricants at low cost and forms a porous structure in the core. Subsequently, the high-frequency final sintering uses the skin effect to quickly densify the surface layer, and the hard particles are strongly combined with the matrix to achieve high hardness and wear resistance. Under the coordination of the two stages, the fluctuation of the friction coefficient is reduced, the production cycle is shortened, and the energy consumption is reduced. At the same time, the toughness of the core, heat dissipation, and surface fatigue resistance are taken into account;

[0045] Furthermore, the sintering rack 400, the flow guide plate 401, the lower support column 403, and the gasket 601 are made of silicon nitride ceramic materials and are not affected by high-frequency heating;

[0046] Example 2: Please refer to Figures 1-6, the fireplace heat preservation component collects the heat lost during flame sintering and high-frequency heating. The heat lost during flame sintering and high-frequency heating is collected and stored by liquid sodium metal. Multiple heat preservation layers are formed on the outer side of the sintering fireplace 100 through liquid sodium metal, which can improve the heat preservation performance of the sintering fireplace 100, reduce the heat radiation and convective heat dissipation on the furnace body surface, and reduce energy loss. The fireplace heat preservation component includes a heat preservation layer A200, a heat preservation pipe 201, a heat preservation layer B202, a heat preservation tank 300, and a high-temperature liquid sodium pump 301; the heat preservation layer A200 is wrapped around the outer side of the sintering fireplace 100, and the inside of the heat preservation layer A200 is a hollow structure. The inside of the heat preservation layer A200 is filled with liquid sodium metal, and the heat preservation pipe 201 is wrapped around the outer side of the heat preservation layer A200. The heat preservation layer B202 is wrapped around the outer side of the heat preservation pipe 201. One end of the bottom of the heat preservation pipe 201 extends into the inside of the heat preservation layer A200, and one end of the top of the heat preservation pipe 201 is connected to a return pipe 303. The end of the return pipe 303 away from the heat preservation layer A200 is connected to the heat preservation tank 300. The high-temperature liquid sodium pump 301 is located at the bottom of the heat preservation tank 300, and an output pipe 302 is connected to the high-temperature liquid sodium pump 301. The end of the output pipe 302 away from the high-temperature liquid sodium pump 301 is inserted into the top of the heat preservation layer A200. The heat energy emitted by the sintering fireplace 100 is absorbed by the liquid sodium metal on the outer side of the sintering fireplace 100, and the sintering fireplace 100 is heat-preserved by the heated liquid sodium metal, thereby reducing energy loss. Moreover, a secondary heat preservation layer is formed by the heat preservation pipe 201 wrapped around the outer side of the heat preservation layer A200, thereby reducing the heat loss of the liquid sodium metal. The heated liquid sodium metal inside the heat preservation layer A200 is transported to the inside of the heat preservation tank 300 through the heat preservation pipe 201, increasing the capacity of the heated liquid sodium metal, so that the high-temperature liquid sodium metal stays inside the heat preservation layer A200 for a longer time, the heat loss is slower after the heating inside the sintering fireplace 100 stops, the cooling speed of the torque limiter friction plate 600 decreases, and the hardened layer formed inside the torque limiter friction plate 600 is more stable. The liquid sodium metal stored inside the heat preservation tank 300 is transported to the heat preservation layer A200 for reflux through the high-temperature liquid sodium pump 301, promoting uniform heating of all the liquid sodium metal and making the temperature of the liquid sodium metal stable and uniform;

[0047] Furthermore, there are multiple annularly distributed heat exchange pipes 104 on the inner side of the sintering fireplace 100. The inside of the heat exchange pipe 104 is a hollow structure. Both ends of the heat exchange pipe 104 are communicated with the inside of the heat preservation layer A200. The heat exchange pipe 104 is made of brass material, and the brass heat exchange pipe 104 has a high heat energy conversion rate. After absorbing heat through the heat exchange pipe 104, the heat is transferred to the liquid sodium metal inside, thereby accelerating the heating of the liquid sodium metal.

[0048] Furthermore, the heat preservation tank 300 has a double-layer structure, with a spacing between the inner liner layer and the outer heat preservation layer. There is a vacuum layer between the inner liner layer and the heat preservation layer. Through the double-layer structure design, the heat preservation performance can be greatly improved, and the heat loss speed can be reduced;

[0049] Furthermore, a mask 103 is provided inside the sintering fireplace 100. Heat insulation is carried out through the mask 103 to prevent the flame from contacting the air inlet ring 101. And the top of the sintering fireplace 100 has an upper cover 105. The upper cover 105 is buckled on the top of the mask 103 to isolate the flame. And the bottom of the heat preservation layer B202 has a fixedly connected bottom plate 203. The bottom of the bottom plate 203 is attached with a lower cover 204. There are two symmetrical bumps on both sides of the lower cover 204. There are two inverted buckles on the bottom of the bottom plate 203. The lower cover 204 can be rotated at the bottom of the bottom plate 203 to be clamped and limited with the bottom plate 203, so as to seal the sintering fireplace 100. And the top of the lower cover 204 has a snap ring. The bottom of the lower support column 403 is embedded inside the snap ring for position limitation.

[0050] Example 3: Please refer to Figures 1-6 , there is a support structure inside the sintering fireplace 100. The support structure includes a sintering rack 400, a connecting piece 402, and a lower support column 403; the torque limiter friction plate 600 is attached to the top of the sintering rack 400. And gaskets 601 are buckled on both sides of the sintering rack 400. The two gaskets 601 are buckled to form a circular ring. And the diameter of the gasket 601 is larger than the diameter of the torque limiter friction plate 600. The top of the gasket 601 is attached to the outside of the torque limiter friction plate 600. After the torque limiter friction plate 600 is sintered, the two gaskets 601 are separated and removed, so that the periphery of the torque limiter friction plate 600 is suspended, thus facilitating the removal of the torque limiter friction plate 600;

[0051] Furthermore, the bottom of the sintering rack 400 is a hollow structure. The top of the connecting piece 402 is embedded in the bottom of the sintering rack 400. The inside of the connecting piece 402 is a hollow structure. The top of the lower support column 403 is embedded in the inside of the connecting piece 402. Among them, a plurality of through holes are annularly opened at the top of the connecting piece 402. The connecting piece 402 is made of polyetherimide plastic. The polyetherimide plastic has good high-temperature resistance. Impact the middle of the sintering rack 400 downward, so that the connecting piece 402 is stressed. The connecting piece 402 breaks at the position of the annular through hole, so that the lower support column 403 is pushed upward, so that the lower support column 403 passes through the connecting piece 402 and is embedded in the inside of the sintering rack 400, so that the sintering rack 400 drives the torque limiter friction plate 600 to fall. The connecting piece 402 is a disposable part and can be replaced after each sintering. And the replaced connecting piece 402 can collect materials for reshaping.

[0052] A process for automatically processing a torque limiter friction material includes the following steps:

[0053] Step 1: Raw material mixing, mixing according to the proportion of the substrate of the torque limiter friction plate;

[0054] Step 2: Cold pressing and forming, pressing the mixed material into the torque limiter friction plate through hydraulic pressure and a pressure plate;

[0055] Step 3: Flame sintering, putting the cold-pressed torque limiter friction plate into the interior of the sintering furnace 100 and preferentially treating the core porous structure through flame calcination, so that the metal particles in the core of the material are initially diffused to form a porous skeleton;

[0056] Step 4: High-frequency heating and calcination, precisely strengthening the surface performance by high-frequency heating. The high-frequency induction heating rapidly raises the temperature of the surface layer. The precise temperature control of the high-frequency heating can form a continuous transitional density gradient between the surface layer and the core, improving the fatigue resistance and friction stability.

[0057] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An automatic processing device for the friction material of a torque limiter, characterized in that: Comprising; The torque limiter friction plate (600) and the sintering furnace (100), the torque limiter friction plate (600) is located inside the sintering furnace (100) for high-temperature sintering. The interior of the sintering furnace (100) has a multi-stage heating component and a furnace heat preservation component; The multi-stage heating component includes a sintering structure and a high-frequency heating structure. The core porous structure is preferentially treated by flame calcination to preliminarily diffuse the metal particles in the core of the material to form a porous skeleton, and then the surface performance is precisely strengthened by combining high-frequency heating. High-frequency induction heating rapidly raises the temperature of the surface layer to form a dense wear-resistant layer. At the same time, the skin effect is used to avoid overburning of the core. Moreover, high-frequency heating can perform gradient heating. The precise temperature control of high-frequency heating can form a continuous transition density gradient between the surface layer and the core, improving the fatigue resistance and friction stability; The furnace heat preservation component collects the heat lost during flame sintering and high-frequency heating. The heat lost during flame sintering and high-frequency heating is collected and stored by liquid sodium metal. Multiple heat preservation layers are formed on the outer side of the sintering furnace (100) by liquid sodium metal to improve the heat preservation performance of the sintering furnace (100), which can reduce the surface heat radiation and convective heat dissipation of the furnace body and reduce energy loss.

2. The device for automatically processing the friction material of a torque limiter according to claim 1, characterized in that: The furnace heat preservation component includes a heat preservation layer A (200), a heat preservation pipe (201), a heat preservation layer B (202), a heat preservation tank (300), and a high-temperature liquid sodium pump (301); The heat preservation layer A (200) is wrapped around the outer side of the sintering furnace (100), and the interior of the heat preservation layer A (200) is a hollow structure. The interior of the heat preservation layer A (200) is filled with liquid sodium metal, and the heat preservation pipe (201) is wrapped around the outer side of the heat preservation layer A (200). The heat preservation layer B (202) is wrapped around the outer side of the heat preservation pipe (201). One end of the bottom of the heat preservation pipe (201) extends into the interior of the heat preservation layer A (200), and one end of the top of the heat preservation pipe (201) is connected to a return pipe (303). The end of the return pipe (303) far from the heat preservation layer A (200) is connected to the heat preservation tank (300). The high-temperature liquid sodium pump (301) is located at the bottom of the heat preservation tank (300), and an output pipe (302) is connected to the high-temperature liquid sodium pump (301). The end of the output pipe (302) far from the high-temperature liquid sodium pump (301) is inserted into the top of the heat preservation layer A (200).

3. The device for automatically processing the friction material of the torque limiter according to claim 1, wherein: The inner side of the sintering furnace (100) has a plurality of annularly distributed heat exchange pipes (104). The interior of the heat exchange pipes (104) is a hollow structure. Both ends of the heat exchange pipes (104) are communicated with the interior of the heat preservation layer A (200), and the heat exchange pipes (104) are made of brass.

4. An apparatus for automatically processing a friction material of a torque limiter according to claim 2, characterized in that: The heat preservation tank (300) is a double-layer structure, and there is a spacing between the inner liner layer and the outer heat preservation layer. There is a vacuum layer between the inner liner layer and the heat preservation layer. The double-layer structure design can greatly improve the heat preservation performance and reduce the heat loss rate.

5. An apparatus for automatically processing a friction material of a torque limiter, according to claim 1, characterized in that: The interior of the sintering furnace (100) has a support structure, and the support structure includes a sintering frame (400), a connecting piece (402), and a lower support (403); The torque limiter friction plate (600) is attached to the top of the sintering rack (400), and gaskets (601) are buckled on both sides of the sintering rack (400). The two gaskets (601) are buckled to form a circular ring, and the diameter of the gasket (601) is larger than that of the torque limiter friction plate (600). The top of the gasket (601) is attached to the outer side of the torque limiter friction plate (600). The bottom of the sintering rack (400) is a hollow structure. The top of the connecting piece (402) is embedded in the bottom of the sintering rack (400). The inside of the connecting piece (402) is a hollow structure. The top of the lower support pillar (403) is embedded in the inside of the connecting piece (402). Among them, a plurality of through holes are annularly opened at the top of the connecting piece (402), and the connecting piece (402) is made of polyetherimide plastic.

6. The device for automatically processing the friction material of a torque limiter according to claim 1, wherein: The sintering structure includes an air inlet ring (101) and a sintering nozzle (102). The air inlet ring (101) is located at a position near the top of the sintering fireplace (100). The air inlet ring (101) and the sintering fireplace (100) are coaxial. A plurality of sintering nozzles (102) are annularly installed on the inner side of the air inlet ring (101). Each sintering nozzle (102) has an inclination angle, and a plurality of guide plates (401) are provided at the top of the sintering rack (400). There is a spacing between every two guide plates (401). The top of the air inlet ring (101) has an energy supply pipe, and a gas tank is connected to the energy supply pipe.

7. An apparatus for automatically processing the friction material of a torque limiter according to claim 1, characterized in that: The high-frequency heating structure includes a high-frequency heating coil (500) and a high-frequency heating host. The diameter of the high-frequency heating coil (500) is larger than that of the torque limiter friction plate (600). The high-frequency heating coil (500) is located at a position near the bottom inside the sintering fireplace (100). Both ends of the high-frequency heating coil (500) pass through the sintering fireplace (100), the thermal insulation layer A (200), and the thermal insulation layer B (202) and extend to the outside of the thermal insulation layer B (202). And the outer sides of both ends of the high-frequency heating coil (500) are provided with local protective layers inside the thermal insulation layer A (200) and the thermal insulation layer B (202), and both ends of the high-frequency heating coil (500) are connected to the high-frequency heating host.

8. The device for automatically processing the friction material of a torque limiter according to claim 1, characterized in that: The inner side of the sintering fireplace (100) has a mask (103), and the top of the sintering fireplace (100) has an upper cover (105). The upper cover (105) is buckled on the top of the mask (103) to isolate the flame. And the bottom of the thermal insulation layer B (202) has a fixedly connected bottom plate (203). The bottom of the bottom plate (203) is attached to a lower cover (204). There are two symmetric bumps on both sides of the lower cover (204), and there are two buckled blocks at the bottom of the bottom plate (203).

9. A process for automatically processing a friction material of a torque limiter according to any one of claims 1-8, characterized in that: It includes the following steps: Step 1: Raw material mixing, mixing according to the base material of the torque limiter friction plate in proportion. Step 2: Cold pressing and forming, pressing the mixed material into the torque limiter friction plate through hydraulic pressure and a pressure plate. Step 3: Flame sintering, putting the cold-pressed torque limiter friction plate into the inside of the sintering fireplace (100) and calcining it by flame to preferentially treat the core porous structure, so that the metal particles in the core of the material are initially diffused to form a porous skeleton. Step 4: High-frequency heating and calcination. The high-frequency heating precisely enhances the surface properties. The high-frequency induction heating rapidly raises the temperature of the surface layer. The precise temperature control of the high-frequency heating can form a continuous and transitional density gradient between the surface layer and the core, improving the fatigue resistance and friction stability.

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