Pressure transmission piston for heating cover of press sintering furnace

Abstract

The utility model relates to a kind of pressure transmission pistons for pressurized sintering furnace heating cover, including plug body structure, by coaxially arranged annular shell, hot end pressure transmission body and cold end pressure transmission body are constituted, the hot end pressure transmission body is located in the annular shell inner chamber bottom and diameter is from bottom to top ladder decrease, the cold end pressure transmission body is installed in the hot end pressure transmission body top by bearing isolator;Cooling assembly includes built-in the spiral cooling channel of the hot end pressure transmission body, the annular cooling cavity formed between the cold end pressure transmission body and annular shell and the fluid communication structure through the bearing isolator;By setting coaxially nested annular shell, hot end pressure transmission body, cold end pressure transmission body and series spiral cooling channel and annular cooling cavity, the efficient, active cooling to plug body structure is realized, effectively reduce the working temperature of plug body in high-temperature die-casting environment, and reduce the heat inside sintering furnace to escape outward through plug body structure.

Description

Technical Field

[0001] This utility model belongs to the field of pressure transmission pistons for sintering furnaces, and specifically designs a pressure transmission piston for a heating hood of a pressurized sintering furnace. Background Technology

[0002] Pressure sintering furnaces are key equipment for various wear-resistant materials, such as aircraft brakes, train (ordinary trains, bullet trains, high-speed trains) brakes, and port crane brakes. Brake materials are all produced by sintering using this specialized equipment. Wear-resistant materials require pressure sintering during production, but the heating hood of the pressure sintering furnace cannot withstand pressure. Therefore, a pressure-transmitting piston needs to be installed in the center circle at the top of the heating hood.

[0003] Traditional pressure-transmitting pistons suffer from poor internal structure, leading to heat loss from the sintering furnace. Furthermore, the continuous up-and-down movement driven by the hydraulic cylinder, along with the high-temperature radiation and heat transfer within the sintering furnace, affects the piston's lifespan. Existing pressure-transmitting pistons lack internal cooling, resulting in a shorter service life. Utility Model Content

[0004] In order to solve the above-mentioned problems in the existing technology, the purpose of this utility model is to provide a pressure transmission piston for the heating hood of a pressure sintering furnace.

[0005] The technical solution adopted in this utility model includes: The plug structure consists of a coaxially arranged annular outer shell, a hot-end pressure transmitting body and a cold-end pressure transmitting body. The hot-end pressure transmitting body is located at the bottom of the inner cavity of the annular outer shell and its diameter decreases in a stepwise manner from the bottom to the top. The cold-end pressure transmitting body is installed on top of the hot-end pressure transmitting body through a load-bearing isolation member. The cooling assembly includes a spiral cooling channel built into the hot-end pressure transmitting body, an annular cooling cavity formed between the cold-end pressure transmitting body and the annular outer shell, and a fluid communication structure that passes through the load-bearing isolation member. The spiral cooling channel and the annular cooling cavity form a series cooling circuit and are used for fluid circulation and transportation through the fluid communication structure. The thermal insulation barrier is a closed vacuum cavity formed by the outer wall of the stepped decreasing section of the heat-transmitting body, the inner wall of the annular shell, and the load-bearing isolation component. Multiple layers of composite thermal insulation are provided inside the closed vacuum wall.

[0006] Furthermore, an axial elastic compensation component is provided between the bottom of the hot end pressure transmission body and the annular outer shell. This component is used to absorb thermal expansion displacement and maintain the sealing of the pressure transmission path.

[0007] Furthermore, the axial elastic compensation component is a metal bellows or a disc spring assembly, with its two ends rigidly connected to the bottom of the hot end pressure transmission body and the bottom of the annular outer shell, respectively.

[0008] Furthermore, the fluid communication structure includes: an upper end cap and at least one pair of fluid inlet pipes and fluid outlet pipes. The upper end cover is connected to the top of the ring-shaped outer shell via a flange. A fluid inlet pipe passes through the upper end cap and extends to the spiral cooling channel and the annular cooling chamber, respectively. A fluid output pipe passes through the upper end cover and extends to the spiral cooling channel and the annular cooling chamber, respectively.

[0009] Furthermore, a dual-cavity structure is formed within the fluid inlet pipe and the fluid outlet pipe, extending to the spiral cooling channel and the annular cooling cavity, respectively.

[0010] Furthermore, the bottom of the annular outer shell is a closed pressure-bearing end face.

[0011] Furthermore, the multilayer composite insulation layer comprises alternating stacked reflective films and nanoporous insulation panels.

[0012] Furthermore, the load-bearing isolation component is an annular load-bearing plate, with its top sealed to the end cap and its outer edge sealed to the annular outer shell.

[0013] Furthermore, the top of the cold-end pressure transmission body is provided with a quick-connect flange for connecting the hydraulic drive unit.

[0014] The beneficial effects of this utility model are as follows: This utility model is a pressure-transmitting piston for a pressurized sintering furnace heating hood. By setting a coaxial nested annular outer shell, a hot-end pressure-transmitting body, a cold-end pressure-transmitting body, and a series of spiral cooling channels and annular cooling chambers, it achieves efficient and active cooling of the piston structure, effectively reduces the working temperature of the piston in the high-temperature die-casting environment, significantly improves the overall thermal stability and service life of the piston structure, and reduces the heat loss from the inside of the sintering furnace to the outside through the piston structure.

[0015] By setting a closed vacuum cavity containing multiple layers of composite insulation between the outer wall of the stepped section of the hot end pressure transfer body and the inner wall of the annular shell, a strong barrier to the high-temperature radiant heat of the sintering furnace is achieved, which greatly improves the insulation efficiency, high-temperature stability and high-temperature life, and effectively blocks or reduces the transfer of heat from the furnace to the annular shell.

[0016] By setting an axial elastic compensation component between the bottom of the hot end pressure transmission body and the bottom of the annular outer shell, the thermal expansion displacement of the plug during operation is effectively absorbed, maintaining the sealing contact pressure between the pressure-bearing end face and the workpiece, avoiding sealing failure or structural damage caused by thermal stress, and ensuring the stability and reliability of the pressurization process. Attached Figure Description

[0017] The present invention will now be described in further detail with reference to the accompanying drawings and specific implementation methods.

[0018] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a top view of the structure of this utility model; Figure 3 This is a structural schematic diagram of the hot-end pressure transmission component of this utility model.

[0019] Explanation of reference numerals in the attached figures: 1. Plug structure; 11. Annular outer shell; 12. Hot end pressure transmission element; 121. Elastic compensation element; 13. Cold end pressure transmission element; 14. Load-bearing isolation element; 2 Cooling components, 21 Spiral cooling channels, 22 Ring-type cooling chambers, 23 Fluid communication structure, 231 Upper end cover, 232 Fluid inlet pipe, 233 Fluid outlet pipe; 3 Thermal insulation barrier, 31 Enclosed vacuum cavity, 32 Multi-layer composite thermal insulation layer, 321 Reflective film, 322 Nanoporous thermal insulation board. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the present utility model and are not intended to limit the present utility model; that is, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The components of the embodiments of the present utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0022] The following is combined with Figure 1-3 This invention describes a specific embodiment of a pressure-transmitting piston for a heating shroud in a pressure sintering furnace, comprising: The plug structure 1 is composed of a coaxially arranged annular shell 11, a hot end pressure transmitting body 12, and a cold end pressure transmitting body 13. The hot end pressure transmitting body 12 is located at the bottom of the inner cavity of the annular shell 11 and its diameter decreases stepwise from the bottom to the top. The cold end pressure transmitting body 13 is installed on the top of the hot end pressure transmitting body 12 through a bearing isolation member 14. Cooling assembly 2 includes a spiral cooling channel 21 built into the hot-end pressure transmitting body 12, an annular cooling cavity 22 formed between the cold-end pressure transmitting body 13 and the annular outer shell 11, and a fluid communication structure 23 penetrating the bearing isolation member 14. The spiral cooling channel 21 and the annular cooling cavity 22 form a series cooling circuit, and the fluid communication structure 23 is used for fluid circulation and transportation. In the die casting process of the workpiece after sintering in the sintering furnace, the pressure applied to the workpiece by the plug structure 1 is used to achieve die casting. The sintering furnace is equipped with a heating hood on top. A central hole is provided in the center of the heating hood for the sliding of a plug structure 1. A hydraulic cylinder is connected to the top of the plug structure 1 to drive it downwards, causing the bottom of the plug structure 1 to contact the workpiece and apply pressure for die casting. When the plug structure 1 contacts the workpiece and applies pressure, it must prevent heat loss from the furnace. By increasing the height of the plug structure 1, it can still seal the sintering furnace even when it is fully inside, preventing internal heat loss. In the plug structure 1… The annular outer shell 11 contains a hot-end pressure transmitting body 12 and a cold-end pressure transmitting body 13. These bodies enhance the overall strength of the plug structure 1. Furthermore, by incorporating a spiral cooling channel 21 within the hot-end pressure transmitting body 12 and forming an annular cooling cavity 22 between the fluid communication structure 23 and the plug structure 1, the plug structure 1 is cooled. This cooling effect, along with the annular outer shell 11 and its internal structure, prevents high temperatures and damage to the plug structure caused by the cylinder drive. The back-and-forth movement driven by structure 1 affects the service life of plug structure 1. To avoid the dissipation of temperature from the sintering furnace, since the lower end of the hot end pressure transfer body 12 is close to the workpiece and its temperature is high, the lower end of the hot end pressure transfer body 12 is set in a stepped decrease, which can take into account both the heat dissipation of the annular shell 11 and the heat preservation of the sintering furnace. When the bottom of the hot end pressure transfer body 12 contacts the workpiece and forms a high temperature zone, the temperature of the lower end of the hot end pressure transfer body 12 is reduced by forming a spiral cooling channel 21 in the lower end of the hot end pressure transfer body 12, thereby improving the service life of the hot end pressure transfer body 12.

[0023] The heat insulation barrier 3 is formed by the outer wall of the stepped decreasing section of the hot end pressure transfer body 12, the inner wall of the annular shell 11, and the load-bearing isolation component 14 to form a closed vacuum cavity 31. The closed vacuum wall is provided with multiple layers of composite heat insulation. A gap is formed between the upper end of the hot end pressure transfer body 12 and the annular shell 11. The heat insulation barrier 3 is formed in this gap to block or reduce the transfer of temperature in the sintering furnace through the annular shell 11 to the hot end pressure transfer body 12, thereby improving the service durability of the hot end pressure transfer body 12 and reducing the transfer of heat in the sintering furnace to the annular shell 11.

[0024] Please refer to Figure 1 and Figure 3As shown, an axial elastic compensation member is provided between the bottom of the hot-end pressure transmitting body 12 and the annular shell 11. This member is used to absorb thermal expansion displacement and maintain the sealing of the pressure transmission path. By providing an elastic compensation member 121 between the bottom of the hot-end pressure transmitting body 12 and the bottom of the inner wall of the annular shell 11, the elastic compensation member 121 can be used to absorb the displacement caused by the thermal expansion of the bottom of the hot-end pressure transmitting body 12, and avoid the movement of the hot-end pressure transmitting body 12 as a whole from affecting the sealing.

[0025] Please refer to Figure 1 As shown, the axial elastic compensation component is a metal bellows or a disc spring assembly, with its two ends rigidly connected to the bottom of the hot end pressure transmitting body 12 and the bottom of the annular shell 11, respectively. The metal bellows and disc spring assembly can provide a certain movable stroke for the movement of the hot end pressure transmitting body 12 within the annular shell 11.

[0026] Please refer to Figure 1 As shown, the fluid communication structure 23 includes: an upper end cap 231 and at least one pair of fluid inlet pipes 232 and fluid outlet pipes 233. The upper end cover 231 connects the load-bearing isolation component 14 to the top of the ring shell synchronously via a flange; A fluid inlet pipe 232 passes through the upper end cap 231 and extends to the spiral cooling channel 21 and the annular cooling chamber 22 respectively; The fluid output pipe 233 passes through the upper end cover 231 and extends to the spiral cooling channel 21 and the annular cooling cavity 22 respectively. The fluid input pipe 232 and the fluid output pipe 233 are respectively provided on the upper end cover 231 and extend into the annular cooling cavity 22 and the fluid communication structure 23. By introducing and continuously circulating cooling fluid into the annular cooling cavity 22 and the fluid communication structure 23, the hot end pressure transmitting body 12 and the cold end pressure transmitting body 13 are cooled down.

[0027] Please refer to Figure 1 As shown, the fluid inlet pipe 232 and the fluid outlet pipe 233 form a dual-cavity structure and extend to the spiral cooling channel 21 and the annular cooling cavity 22, respectively. The dual cavities contain different pipelines for cooling and circulating the fluid to the annular cooling cavity 22 and the fluid communication structure 23, respectively.

[0028] Please refer to Figure 1 As shown, the bottom of the annular shell 11 is a closed pressure-bearing end face, and the bottom pressure-bearing end face of the annular shell 11 forms an integral structure with the annular shell 11, which can withstand the pressure of the die-cast workpiece.

[0029] Please refer to Figure 1As shown, the multilayer composite insulation layer 32 includes alternating stacked reflective films 321 and nanoporous insulation boards 322. The multilayer composite insulation layer 32 formed by alternating stacking of multilayer reflective films 321 and nanoporous boards replaces traditional insulation cotton, effectively improving the insulation efficiency, high temperature stability and high temperature resistance life of the insulation layer.

[0030] Please refer to Figures 1-3 As shown, the bearing isolation member 14 is an annular bearing plate, the top of which is sealed to the end cap, and the outer edge of which is sealed to the annular outer shell 11. The bearing isolation member 14 is used to support the cold end pressure transmission body 13 on the hot end pressure transmission body 12.

[0031] Please refer to Figure 3 As shown, the top of the cold end pressure transmission body 13 is provided with a quick-connect flange for connecting the hydraulic drive unit, so as to facilitate the connection between the cylinder drive end and the top of the plug structure 1.

[0032] Working principle of this utility model: The top of the plug structure 1 is connected to the hydraulic cylinder drive end via a quick-connect flange, allowing the hydraulic cylinder to drive the plug structure 1 to move within the heating hood. The entire movement process achieves complete sealing of the sintering furnace, preventing the dissipation of internal heat. Under the drive of the hydraulic cylinder, the pressure-bearing end face formed at the lower end of the annular outer shell 11 contacts the workpiece and applies pressure to achieve die casting of the workpiece.

[0033] When the high temperature radiation from the sintering furnace reaches the hot end pressure transmission body 12, the ring-shaped cooling cavity 22 formed between the outer wall of its stepped section and the annular shell 11 reflects and blocks part of the heat radiated by the annular shell 11. Meanwhile, coolant is injected from the inlet pipe and delivered to the spiral cooling channel 21 and the ring-shaped cooling chamber 22 flowing through the hot end, thereby cooling the spiral cooling channel 21 and the ring-shaped cooling chamber 22 to achieve efficient cooling of the hot end pressure transmission body 12 and the workpiece in direct contact, as well as overall cooling of the inside of the plug structure 1, so as to prevent the plug structure 1 from being affected by the temperature inside the sintering furnace and thus its durability. When the hot-end pressure transmission body 12 expands due to heat, the rigidly connected metal bellows / disc spring assembly is compressed and deformed to absorb axial displacement, maintain the sealing contact between the pressure-bearing end face and the workpiece, and avoid stress concentration leading to seal failure.

[0034] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0035] The above description is merely an example and illustration of the structure of this utility model. Those skilled in the art can make various modifications or additions to the specific embodiments described or use similar methods to replace them, as long as they do not deviate from the structure of the utility model or exceed the scope defined in the claims, they should all fall within the protection scope of this utility model.

Claims

1. A pressure-transmitting piston for a heating shroud in a pressure sintering furnace, characterized in that, include: The plug structure (1) is composed of an annular shell (11), a hot end pressure transmitting body (12) and a cold end pressure transmitting body (13) arranged coaxially. The hot end pressure transmitting body (12) is located at the bottom of the inner cavity of the annular shell (11) and its diameter decreases stepwise from the bottom to the top. The cold end pressure transmitting body (13) is installed on the top of the hot end pressure transmitting body (12) through a bearing isolation member (14). The cooling assembly (2) includes a spiral cooling channel (21) built into the hot end pressure transmitting body (12), an annular cooling cavity (22) formed between the cold end pressure transmitting body (13) and the annular shell (11), and a fluid communication structure (23) penetrating the bearing isolation member (14). The spiral cooling channel (21) and the annular cooling cavity (22) form a series cooling circuit and are used for fluid circulation and transportation through the fluid communication structure (23). The heat insulation barrier (3) is formed by the outer wall of the stepped decreasing section of the heat-transmitting body (12), the inner wall of the annular shell (11), and the load-bearing isolation component (14) to form a closed vacuum cavity (31), and a multi-layer composite heat insulation layer is provided in the closed vacuum cavity.

2. The pressure-transmitting piston for a heating shroud of a pressure sintering furnace according to claim 1, characterized in that: An axial elastic compensation component is provided between the bottom of the hot end pressure transmission body (12) and the annular shell (11). This component is used to absorb thermal expansion displacement and maintain the sealing of the pressure transmission path.

3. The pressure-transmitting piston according to claim 2, characterized in that: The axial elastic compensation component is a metal bellows or a disc spring assembly, with its two ends rigidly connected to the bottom of the hot end pressure transmission body (12) and the bottom of the annular shell (11).

4. The pressure-transmitting piston for a pressure sintering furnace heating shroud according to claim 1, characterized in that, The fluid communication structure (23) includes: an upper end cap (231) and at least one pair of fluid inlet pipes (232) and fluid outlet pipes (233). The upper end cover (231) is connected to the top of the annular outer shell by means of a flange, and the load-bearing isolation member (14) is connected to the top of the annular outer shell simultaneously. A fluid inlet pipe (232) passes through the upper end cap (231) and extends to the spiral cooling channel (21) and the annular cooling chamber (22), respectively; A fluid output pipe (233) passes through the upper end cap (231) and extends to the spiral cooling channel (21) and the annular cooling chamber (22), respectively.

5. A pressure-transmitting piston for a heating shroud of a pressure sintering furnace according to claim 4, characterized in that: The fluid inlet pipe (232) and the fluid outlet pipe (233) form a dual-cavity structure and extend to the spiral cooling channel (21) and the annular cooling cavity (22), respectively.

6. A pressure-transmitting piston for a heating shroud of a pressure sintering furnace according to claim 1, characterized in that: The bottom of the annular shell (11) is a closed pressure-bearing end face.

7. A pressure-transmitting piston for a heating shroud of a pressure sintering furnace according to claim 1, characterized in that: The multilayer composite insulation layer (32) comprises alternating stacked reflective films (321) and nanoporous insulation panels (322).

8. The pressure-transmitting piston according to claim 1, characterized in that: The load-bearing isolation component (14) is an annular load-bearing plate, the top of which is sealed to the end cap, and the outer edge of which is sealed to the annular outer shell (11).

9. The pressure-transmitting piston according to claim 8, characterized in that: The top of the cold end pressure transmission body (13) is provided with a quick-connect flange for connecting the hydraulic drive unit.

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