Vacuum hot-pressing furnace hoisting system capable of preventing graphite pressing head from breaking

Abstract

The application relates to a vacuum hot-pressing furnace hoisting system capable of preventing graphite pressure head fracture, and belongs to the technical field of hoisting equipment of vacuum hot-pressing furnaces. The system comprises a clamping piece, a sleeve piece and a connecting piece. The top end of a mounting groove is provided with an inclined surface. The groove bottom area of the mounting groove close to the axis of the graphite pressure head is smaller than the groove opening area of the mounting groove away from the axis of the graphite pressure head. The inclined surface is parallel to the fracture surface of the graphite pressure head. The clamping piece is annularly arranged on the mounting groove. The clamping piece is detachably connected with the mounting groove. The upper end of the clamping piece is provided with an inclined part. The inclined angle of the inclined part is the same as that of the inclined surface. The inclined part can be attached to the inclined surface. The lower end of the sleeve piece is provided with a connecting part. The inner diameter of the connecting part is greater than or equal to the outer diameter of the clamping piece. The sleeve piece is sleeved on the outer periphery of the clamping piece. The connecting piece is connected with the clamping piece and the sleeve piece. The application has the effect of improving the problem that the graphite pressure head is prone to fracture during movement.

Description

Technical Field

[0001] This application relates to the technical field of hoisting equipment for vacuum hot press furnaces, and in particular to a hoisting system for vacuum hot press furnaces that prevents graphite indenter breakage. Background Technology

[0002] A vacuum hot press furnace is a device that heats and pressurizes materials in a vacuum environment. It is commonly used in sintering, hot pressing, and other processes. Its main purpose is to improve the density and mechanical properties of materials under high temperature and high pressure conditions by reducing oxidation and contamination. A vacuum hot press furnace mainly consists of a furnace body, furnace door, heating and holding / temperature measuring system, vacuum system, gas filling system, water cooling system, control system, and hydraulic system. Vacuum hot press furnaces are cycle-operated and widely used for hot pressing and sintering of cemented carbide, functional ceramics, and powder metallurgy materials under high temperature and high vacuum conditions. They can also be used for hot pressing and sintering under gas-filled protection.

[0003] Graphite pressure heads are key components in vacuum autoclaves, used to transfer pressure and heat. Due to graphite's excellent thermal conductivity and high-temperature resistance, it is widely used in vacuum autoclaves. Currently, the structure of graphite pressure heads is as follows: Figure 1 As shown, the graphite pressure head 100′ is typically cylindrical in shape and has a slot 110′ at the top for connecting to a lifting device. The ring buckle engages with the slot 110′ so that the ring buckle can be moved by the lifting device during operation. The ring buckle fitted in the slot 110′ drives the graphite pressure head 100′ to be lifted.

[0004] However, while graphite possesses excellent high-temperature resistance and thermal conductivity, it is also brittle and has low tensile strength. Because the upper and lower end faces of the slot 110' in the related technology are both right-angled, it is not conducive to stress dispersion, increasing the risk of stress concentration at the slot 110' during lifting. Stress concentration increases the risk of fracture, making the slot 110' prone to fracture when subjected to concentrated stress.

[0005] The aforementioned technologies have the defect that the graphite indenter is prone to breakage when it moves. Summary of the Invention

[0006] To address the issue of graphite indenters easily breaking during movement, this application provides a vacuum hot press furnace hoisting system that prevents graphite indenters from breaking.

[0007] The vacuum hot autoclave hoisting system for preventing graphite indenter breakage provided in this application adopts the following technical solution: A vacuum autoclave hoisting system for preventing graphite indenter breakage includes an installation groove on the outer circumference of the upper end of the graphite indenter. The top of the installation groove has a slope, such that the bottom area of ​​the groove near the axis of the graphite indenter is smaller than the opening area away from the axis of the graphite indenter, and the slope is parallel to a predetermined fracture surface of the graphite indenter. The system comprises: a snap-fit ​​component, circumferentially disposed in the installation groove and detachably connected to it, with an inclined portion at its upper end, the inclined portion having the same inclination angle as the slope and capable of fitting against the slope; a sleeve component, with a connecting portion at its lower end, the inner diameter of which is greater than or equal to the outer diameter of the snap-fit ​​component, and the sleeve component fitted around the outer circumference of the snap-fit ​​component; and a connecting component, which connects the snap-fit ​​component and the sleeve component.

[0008] By adopting the above technical solution, an inclined surface is set at the top of the mounting groove of the graphite indenter, and the inclined surface is parallel to the preset fracture surface of the graphite indenter. This allows the force acting on the inclined surface to be set at an angle to the preset fracture surface, which helps to reduce the risk of fracture. The snap-fit ​​component connects to the mounting groove, and the lower end of the sleeve is fitted onto the outer periphery of the snap-fit ​​component through a connecting part and connected by a connector. This helps to improve the reliability of the connection between the snap-fit ​​component and the mounting groove. On the other hand, fitting onto the outer periphery of the snap-fit ​​component improves the force balance on the snap-fit ​​component and facilitates the driving action of the snap-fit ​​component. By reducing excessive local stress, it helps improve hoisting safety and extend the service life of the graphite indenter. The inclined part of the snap-fit ​​component fits with the inclined surface, and the inclined part closely fits with the inclined surface in the mounting groove to form a stable contact surface. This improves stability and, during the movement of the graphite indenter, the force exerted by the snap-fit ​​component on the graphite indenter is set at an angle with the inclined surface. This effectively disperses the stress in the mounting groove during hoisting, reduces the force along the inclined surface, and avoids graphite indenter breakage caused by stress concentration, thereby reducing the risk of breakage at the pre-set fracture surface.

[0009] Optionally, the top of the mounting groove is provided with a limiting surface. Along the direction perpendicular to the axis of the graphite indenter, the limiting surface is located between the groove opening of the mounting groove and the inclined surface. The limiting surface and the inclined surface are set at an angle, so that the groove area of ​​the end of the limiting surface near the axis of the graphite indenter is greater than or equal to the groove opening area. The upper end of the snap-fit ​​member is provided with a limiting part, which can fit against the limiting surface.

[0010] By adopting the above technical solution, based on the setting of the inclined plane, by setting the limiting surface and cooperating with the limiting part, the increase of unilateral stress, sudden mechanical stress and transient tensile stress caused by the leveling error when lifting the graphite indenter can be effectively reduced. This reduces the risk of the graphite indenter slipping and misaligning with the clamping part during the hoisting process, which may cause the clamping part to come off. This helps to make the hoisting process more stable and improve the safety and reliability of the hoisting.

[0011] Optionally, the snap-fit ​​component has a first connecting hole, and the sleeve component has a second connecting hole. The second connecting hole corresponds to the first connecting hole. The length of the second connecting hole along the axis of the graphite indenter is greater than the length of the first connecting hole along the axis of the graphite indenter. The connector is fixedly connected to the first connecting hole, and the second connecting hole is movably connected to the connector, so that the sleeve component can move relative to the snap-fit ​​component along the axis of the graphite indenter.

[0012] By adopting the above technical solution, since the first connecting hole and the second connecting hole are correspondingly set and connected by the same connector, and the length of the second connecting hole along the axis of the graphite indenter is greater than that of the first connecting hole, when the sleeve lifts the graphite indenter, the snap-fit ​​can move relative to the sleeve along the axis of the graphite indenter. This helps the graphite indenter connected to the snap-fit ​​to automatically level under its own weight, making the stress on the mounting groove more even and reducing the possibility of uneven stress caused by the tilting of the graphite indenter. This reduces the risk of the graphite indenter breaking due to stress concentration during hoisting.

[0013] Optionally, along the direction perpendicular to the axis of the graphite indenter, the depth of the mounting groove is greater than the thickness of the snap-fit ​​member, so that a gap can be left between the snap-fit ​​member and the bottom of the mounting groove; along the axis of the graphite indenter, the length of the snap-fit ​​member is less than the length of the mounting groove.

[0014] By adopting the above technical solution, the depth and length of the mounting groove are designed to allow for sufficient movement of the snap-fit ​​component within the groove. This facilitates the snap-fit ​​component's embedding into the groove, reducing installation difficulty. Furthermore, it allows the graphite indenter to move relative to the snap-fit ​​component during hoisting, reducing the restriction on the graphite indenter's posture and improving the ease of leveling. Simultaneously, it also distributes the stress within the mounting groove, reducing the risk of breakage of the graphite indenter during hoisting and ensuring stable hoisting.

[0015] Optionally, the snap-fit ​​component includes a plurality of snap-fit ​​parts, which are evenly distributed around the circumference of the mounting groove, and the plurality of snap-fit ​​parts cooperate with each other.

[0016] By adopting the above technical solution, multiple snap-fit ​​parts are distributed circumferentially in the mounting groove and cooperate with each other, making the snap-fit ​​parts easy to disassemble, thereby improving the disassembly and maintenance efficiency of the system; in addition, the several snap-fit ​​parts distributed circumferentially can bear the load from the hoisting process more evenly, thereby avoiding the risk of fracture caused by stress concentration on a single point, and improving the safety and reliability of the graphite indenter during the hoisting process.

[0017] Optionally, it also includes a reinforcing rib, which surrounds the outer periphery of the sleeve, and the snap-fit ​​member and the reinforcing rib are respectively disposed on the inner and outer sides of the sleeve, and the reinforcing rib is used to fasten the connection between the snap-fit ​​member and the sleeve.

[0018] By adopting the above technical solution, the reinforcing rib can effectively enhance the connection stability between the snap-fit ​​component and the sleeve component, thereby improving the reliability of the entire hoisting system and reducing safety hazards caused by the loosening of the snap-fit ​​component or sleeve component during hoisting.

[0019] Optionally, it further includes a heat-conducting component, wherein the diameter of the connecting portion is larger than the diameter of the upper end of the sleeve, and along the axis of the graphite indenter, the length of the connecting portion is greater than the length between the bottom end of the mounting groove and the top end of the graphite indenter, the heat-conducting component is disposed inside the sleeve, the upper end of the heat-conducting component abuts against the upper end of the connecting portion, the lower side of the heat-conducting component is disposed at the top end of the graphite indenter, and along the direction perpendicular to the axis of the graphite indenter, the cross-sectional area of ​​the heat-conducting component is equal to the cross-sectional area of ​​the top end of the graphite indenter.

[0020] By adopting the above technical solution, the heat-conducting component can ensure that the graphite indenter is heated evenly through its high thermal conductivity, thereby reducing stress concentration caused by excessive temperature gradient and lowering the risk of graphite indenter breakage.

[0021] Optionally, it also includes a mandrel disposed inside the sleeve, the mandrel having a groove on its outer periphery, the groove creating a gap between the mandrel and the inner wall of the sleeve.

[0022] By adopting the above technical solution, the mandrel can facilitate heat conduction, which helps to make the graphite indenter heat up evenly; the circumferential gap of the mandrel helps to make heat transfer more uniform, reducing the risk of the graphite indenter breaking due to uneven heating, while improving the overall system's heat conduction efficiency and ensuring the reliable realization of hot pressing.

[0023] Optionally, the heat-conducting component is connected to the mandrel by a fastener, and the fastener is spaced apart from the top of the graphite indenter.

[0024] By adopting the above technical solution, the heat-conducting component and the mandrel are connected by fasteners, ensuring a stable connection between the two and improving the structural stability of the entire system. At the same time, the spacing between the fasteners and the top of the graphite indenter reduces the local stress concentration caused by the fasteners on the graphite indenter, thereby reducing the risk of the graphite indenter breaking during hoisting. It also reduces the risk of the fasteners damaging the surface of the graphite indenter, which could affect the heat transfer uniformity and hot pressing effect of the graphite indenter.

[0025] Optionally, the top end of the sleeve is provided with a flange, which is used to connect to a lifting structure, and the lifting structure is used to move the flange.

[0026] By adopting the above technical solution, the flange is used to connect the sleeve and the lifting structure. The lifting structure can drive the flange to move, thereby realizing the safe and convenient lifting of the graphite indenter.

[0027] In summary, this application includes at least one of the following beneficial technical effects: 1. An inclined surface is provided at the top of the mounting groove of the graphite indenter, and the inclined surface is parallel to the preset fracture surface of the graphite indenter. This ensures that the force acting on the inclined surface forms an angle with the preset fracture surface, which helps reduce the risk of fracture. The snap-fit ​​component connects to the mounting groove, and the lower end of the sleeve is fitted onto the outer periphery of the snap-fit ​​component through a connecting part, and the connection is achieved through a connector. This helps improve the reliability of the connection between the snap-fit ​​component and the mounting groove. On the other hand, fitting onto the outer periphery of the snap-fit ​​component improves the force balance on the snap-fit ​​component and facilitates the driving action of the snap-fit ​​component, thereby reducing... In cases of excessive localized stress, this helps improve hoisting safety and extend the service life of the graphite indenter. The inclined part of the snap-fit ​​component fits with the inclined surface, forming a stable contact surface by tightly fitting the inclined part with the inclined surface in the mounting groove. This improves stability and, during the movement of the graphite indenter, ensures that the force exerted by the snap-fit ​​component on the graphite indenter is set at an angle to the inclined surface. This effectively disperses the stress in the mounting groove during hoisting, reduces the force along the inclined surface, and avoids graphite indenter breakage caused by stress concentration, thereby reducing the risk of breakage at the pre-set fracture surface. 2. Based on the inclined plane, by setting a limiting surface and cooperating with the limiting part, it can effectively reduce the increase of unilateral stress, sudden mechanical stress and transient tensile stress caused by the leveling error when lifting the graphite indenter. This reduces the risk of the graphite indenter slipping and misaligning with the clamping part during the hoisting process, which may cause the clamping part to come off. This helps to make the hoisting process more stable and improve the safety and reliability of the hoisting. 3. Since the first connecting hole and the second connecting hole are correspondingly set and connected by the same connector, and the length of the second connecting hole along the axis of the graphite indenter is greater than that of the first connecting hole, when the sleeve lifts the graphite indenter, the snap-fit ​​can move relative to the sleeve along the axis of the graphite indenter. This helps the graphite indenter connected to the snap-fit ​​to automatically level under its own weight, making the stress on the mounting groove more even and reducing the possibility of uneven stress caused by the tilting of the graphite indenter. This reduces the risk of the graphite indenter breaking due to stress concentration during hoisting. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of a graphite indenter in related technologies.

[0029] Figure 2 This is a schematic diagram of a vacuum hot press furnace hoisting system for preventing graphite indenter breakage according to an embodiment of this application.

[0030] Figure 3 This is a schematic diagram of a graphite indenter according to an embodiment of this application.

[0031] Figure 4 This is a top view of the vacuum hot press furnace hoisting system for preventing graphite indenter breakage according to an embodiment of this application.

[0032] Figure 5 yes Figure 4 Cross-sectional view at point AA.

[0033] Figure 6 This is a front view of the sleeve component according to an embodiment of this application.

[0034] Figure 7 yes Figure 6 Cross-sectional view at point BB.

[0035] Figure 8 This is a schematic diagram of the sleeve component lifting the graphite pressure head according to an embodiment of this application.

[0036] Figure 9 This is a schematic diagram of the sleeve component pressing down the graphite pressure head according to an embodiment of this application.

[0037] Figure 10 This is a schematic diagram of the hidden sleeve component of the vacuum hot press furnace hoisting system for preventing graphite indenter breakage, according to an embodiment of this application.

[0038] Explanation of reference numerals in the attached figures: 100′, graphite pressure head; 110′, card slot; 100. Graphite pressure head; 110. Mounting groove; 120. Inclined surface; 130. Limiting surface; 1. Snap-fit ​​part; 11. Inclined part; 12. Limiting part; 13. Snap-fit ​​part; 14. First connecting hole; 2. Sleeve part; 21. Connecting part; 22. Second connecting hole; 3. Reinforcing rib; 4. Heat-conducting part; 5. Mandrel; 51. Groove; 6. Fastener; 7. Flange. Detailed Implementation

[0039] The following is in conjunction with the appendix Figure 1 -Appendix Figure 10 This application will be further described in detail below. In this embodiment, unless otherwise specified, "connection", "linking", and "fixing" are interpreted broadly, including fixed connection, detachable connection, connection to form an integral structure, mechanical connection, electrical connection, direct connection, indirect connection through an intermediary, internal connection, and interaction between two components, etc., and can be understood according to the specific circumstances.

[0040] In this application, unless otherwise expressly specified and limited, "above" or "below" a second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, in the description of this embodiment, terms such as "above," "below," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings, and are used only for ease of description and simplification of operation, not to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise stated, directional terms such as "inner" and "outer" used in this application refer to the outline of the corresponding component itself.

[0041] like Figure 2 , Figure 3 and Figure 4As shown, this application embodiment, after analyzing the strength of the graphite indenter 100, discloses a vacuum hot press furnace hoisting system (hereinafter referred to as the "system") to prevent graphite indenter fracture by determining the stress mode of the graphite indenter 100 and analyzing the structure of the failure surface. This system is used to reduce the risk of graphite indenter 100 fracture. Preferably, the upper outer periphery of the graphite indenter 100 is provided with an installation groove 110. By performing stress analysis on the actual stress state of the graphite indenter 100, the corresponding material parameters and dimensions are input into static stress simulation software, and the corresponding boundary conditions and stress conditions are set. Finally, the stress-strain distribution of the graphite indenter 100 is obtained through simulation calculation, and the bending state and stress direction of the edge of the installation groove 110 during the tensile process are obtained. Combined with the fracture surface direction of the graphite indenter 100 in actual engineering, the fracture location of the graphite indenter 100 is determined to be most likely to occur at the upper edge of the installation groove 110 of the graphite indenter 100, with the fracture surface preset to be a shear surface in an inclined direction. Through stress analysis, simulation, and comparative analysis with actual failure surfaces, this embodiment optimizes the structure and system for the maximum stress surface of the graphite indenter 100 during the tensile process, thereby improving the stability of the graphite indenter 100 hoisting system.

[0042] like Figure 2 , Figure 3 and Figure 5 As shown, the system includes a snap-fit ​​component 1, a sleeve component 2, and a connector, which are used to cooperate with the cylindrical graphite indenter 100 to achieve hoisting. By reinforcing and protecting the shear surface of the graphite indenter 100, i.e. the preset fracture surface, stability is increased, so that the graphite indenter 100 can be lifted or driven to press down, thereby completing the hot pressing process and reducing the risk of the graphite indenter 100 breaking.

[0043] like Figure 2 , Figure 3 and Figure 5As shown, the upper outer periphery of the graphite indenter 100 is provided with an installation groove 110, and the snap-fit ​​component 1 is circumferentially disposed in the installation groove 110. The installation groove 110 is an annular groove, and the snap-fit ​​component 1 is an annular structure. During the hoisting process of the graphite indenter 100, the upper end of the installation groove 110 of the graphite indenter 100 is subjected to tensile stress by the snap-fit ​​component 1, in the upward direction; at the same time, the graphite indenter 100 is subjected to its own weight, in the downward direction. During the lifting process, the installation groove 110 of the graphite indenter 100 will undergo bending deformation under the combined force; due to the eccentric force form, the upper edge of the graphite indenter 100 is simultaneously subjected to huge shear force. Therefore, in actual use, the upper end of the graphite indenter 100 is prone to fracture, and the failure location and the preset fracture surface are similar to a 45° shear crack surface. Therefore, to improve the strength and stability of the graphite indenter 100 during hoisting, it is necessary to increase the strength of the mounting groove 110 of the graphite indenter 100 perpendicular to the shear stress direction, alleviate the stress concentration at the top of the mounting groove 110, and reduce the occurrence of damage. In this embodiment, an inclined surface 120 is provided at the top of the mounting groove 110. The inclined surface 120 is designed such that the bottom area of ​​the mounting groove 110 near the axis of the graphite indenter 100 is smaller than the opening area of ​​the mounting groove 110 away from the axis of the graphite indenter 100, thereby making the inclined surface 120 parallel to the preset fracture surface of the graphite indenter 100. Since the preset fracture surface of the graphite indenter 100 is mostly inclined at a 45° angle, in this embodiment, the inclination angle of the inclined surface 120 can be 45°. The parallelism between the inclined surface 120 and the preset fracture surface allows the direction of the force to be perpendicular to or at an angle to the preset fracture surface, thereby dispersing and reducing the shear stress generated along the preset fracture surface, reducing the risk of fracture of the preset fracture surface, and improving reliability. In other embodiments, the tilt angle of the inclined plane 120 can be adaptively adjusted according to the actual preset fracture surface angle to meet the usage requirements.

[0044] like Figure 2 , Figure 3 and Figure 5As shown, the snap-fit ​​component 1 is circumferentially disposed in the mounting groove 110, and the snap-fit ​​component 1 is detachably connected to the mounting groove 110. The upper end of the snap-fit ​​component 1 is provided with an inclined portion 11, the inclined portion 11 having the same inclination angle as the inclined surface 120. The inclined portion 11 can fit against the inclined surface 120, thereby making the applied force perpendicular to the inclined surface 120, that is, the applied force perpendicular to the shear stress direction, reducing the shear stress generated along the preset fracture surface direction, and reducing the risk of fracture of the graphite indenter 100. The inclined portion 11 of the snap-fit ​​component 1 cooperates with the inclined surface 120. The inclined portion 11 and the inclined surface 120 in the mounting groove 110 are closely attached to form a stable contact surface, which improves stability. At the same time, during the movement of the graphite pressure head 100, the force exerted by the snap-fit ​​component 1 on the graphite pressure head 100 is set at an angle with the inclined surface 120. During the hoisting process, the stress at the mounting groove 110 is effectively dispersed, the force along the direction of the inclined surface 120 is reduced, and the graphite pressure head 100 is prevented from breaking due to stress concentration, thereby reducing the risk of graphite pressure head 100 breaking.

[0045] like Figure 5 , Figure 6 and Figure 7 As shown, the lower end of the sleeve 2 is provided with a connecting part 21, which is an annular groove structure. The inner diameter of the connecting part 21 is greater than or equal to the outer diameter of the snap-fit ​​1. The sleeve 2 is fitted onto the outer circumference of the snap-fit ​​1, and the connector is used to connect the snap-fit ​​1 and the sleeve 2. The snap-fit ​​1 is connected to the mounting groove 110. The lower end of the sleeve 2 is fitted onto the outer circumference of the snap-fit ​​1 through the connecting part 21 and connected by the connector. On the one hand, the annular shape increases the force-bearing area, which helps to improve the reliability of the connection between the snap-fit ​​1 and the mounting groove 110. On the other hand, fitting onto the outer circumference of the snap-fit ​​1 improves the force balance on the snap-fit ​​1 and facilitates the driving action on the snap-fit ​​1. By reducing the situation of excessive local force, it helps to improve the safety of hoisting and extend the service life of the graphite indenter 100. The system has a simple structure, low manufacturing cost, and can easily hoist the graphite indenter 100 while reducing the risk of breakage of the graphite indenter 100.

[0046] like Figure 2 , Figure 3 and Figure 5As shown, optionally, the top of the sleeve 2 is provided with a flange 7. The flange 7 is used to connect to the lifting structure, which in turn moves the flange 7. The flange 7 connects the sleeve 2 to the lifting structure, enabling the lifting structure to move the flange 7, thus achieving safe and convenient lifting of the graphite indenter 100. The lifting structure drives the sleeve 2 and the snap-fit ​​component 1 to move the graphite indenter 100. Compared to directly connecting the lifting structure to the graphite indenter 100 via a ring snap, the relative mobility between the sleeve 2, the snap-fit ​​component 1, and the graphite indenter 100 improves the automatic leveling capability of the graphite indenter 100, helps to balance the force on the graphite indenter 100, and reduces the risk of breakage. The lifting structure can use an existing structure that can move the flange 7.

[0047] During hoisting, the inclined plane 120 could normally ensure the stability of the system through friction. However, to prevent the graphite indenter 100 from slipping or misaligning with the snap-fit ​​component 1 due to increased unilateral stress, sudden mechanical stress, and transient tensile stress caused by leveling errors, this embodiment provides a limiting surface 130 at the top of the mounting groove 110. Optionally, the limiting surface 130 is located between the opening of the mounting groove 110 and the inclined plane 120 along a direction perpendicular to the axis of the graphite indenter 100. The limiting surface 130 and the inclined plane 120 are set at an angle, such that the groove area of ​​the end of the limiting surface 130 closest to the axis of the graphite indenter 100 is greater than or equal to the groove opening area. The upper end of the snap-fit ​​component 1 is provided with a limiting part 12, which can fit against the limiting surface 130. In this embodiment, the limiting surface 130 is perpendicular to the axis of the graphite indenter 100. The edge of the limiting surface 130 can be rounded. By setting the limiting surface 130, the risk of slippage and misalignment during the lifting process can be reduced, increasing structural safety. Based on the setting of the inclined surface 120, by setting the limiting surface 130 and cooperating with the limiting part 12, the risk of unilateral stress increase, sudden mechanical stress and transient tensile stress caused by leveling error during the lifting of the graphite pressure head 100 is effectively reduced, thus reducing the risk of slippage and misalignment between the graphite pressure head 100 and the clamping part 1 during the hoisting process, which could cause the clamping part 1 to dislodge. This helps to make the hoisting process more stable and improves the safety and reliability of the hoisting.

[0048] like Figure 2 , Figure 3 and Figure 5As shown, optionally, the snap-fit ​​component 1 has a first connecting hole 14, and the sleeve component 2 has a second connecting hole 22. The second connecting hole 22 is correspondingly set with the first connecting hole 14 to achieve connection. Before hoisting, the sleeve component 2, snap-fit ​​component 1, graphite pressure head 100, and other components are installed respectively. However, during the actual assembly process, the leveling error caused by the process precision will cause the graphite pressure head 100 to shift laterally during lifting and pressing. This tilt caused by leveling will further lead to uneven force on the graphite pressure head 100, resulting in greater stress concentration on the tilted side of the graphite pressure head 100, thereby increasing the risk of breakage. In addition, during the pressing process, the snap-fit ​​component 1 exerts a squeezing effect on the lower end of the mounting groove 110. The stress concentration caused by squeezing will also increase the risk of breakage of the graphite pressure head 100. Therefore, in this embodiment, the length of the second connecting hole 22 along the axis of the graphite pressure head 100 is greater than the length of the first connecting hole 14 along the axis of the graphite pressure head 100. The connector is fixedly connected to the first connecting hole 14, and the second connecting hole 22 is movably connected to the connector, so that the sleeve 2 can move relative to the snap-fit ​​1 along the axis of the graphite pressure head 100. The first connecting hole 14 is a threaded hole, and the connector can be a bolt, which is screwed into the first connecting hole 14. The end of the bolt is spaced apart from the graphite pressure head 100.

[0049] Because the first connecting hole 14 and the second connecting hole 22 are correspondingly arranged and connected to each other through the same connector, and the length of the second connecting hole 22 along the axis of the graphite indenter 100 is greater than that of the first connecting hole 14, when the sleeve 2 lifts the graphite indenter 100, the snap-fit ​​1 can move relative to the sleeve 2 along the axis of the graphite indenter 100. This helps the graphite indenter 100 connected to the snap-fit ​​1 to automatically level itself under its own weight, making the stress on the mounting groove 110 even and reducing the possibility of uneven stress caused by tilting of the graphite indenter 100. This reduces the risk of the graphite indenter 100 breaking due to stress concentration during hoisting. The open connection structure of the snap-fit ​​1 and the sleeve 2 helps to automatically adjust for the offset and lateral slippage of the graphite indenter 100 caused by leveling errors and process errors.

[0050] like Figure 5 , Figure 6 and Figure 7As shown, the first connecting hole 14 can be a circular hole, and the second connecting hole 22 can be an elliptical hole. Multiple first connecting holes 14 and second connecting holes 22 can be provided, evenly distributed around the circumference of the snap-fit ​​component 1 and the sleeve component 2, which helps to balance the force. The first connecting holes 14 and the second connecting holes 22 are provided in a one-to-one correspondence. Specifically, the first connecting hole 14 is a circular threaded hole with a diameter of 10mm, and the sleeve component 2 has a concentric elliptical hole. This allows for freer contact between the sleeve component 2 and the snap-fit ​​component 1 during the hoisting of the graphite indenter 100. If misalignment occurs due to leveling or other process issues, this flexible fit system allows the graphite indenter 100 to automatically correct itself under gravity, ensuring uniform force distribution.

[0051] like Figure 5 , Figure 8 and Figure 9 As shown, optionally, along the direction perpendicular to the axis of the graphite indenter 100, the depth of the mounting groove 110 is greater than the thickness of the snap-fit ​​member 1, allowing a gap between the snap-fit ​​member 1 and the bottom of the mounting groove 110. Along the axis of the graphite indenter 100, the length of the snap-fit ​​member 1 is less than the length of the mounting groove 110. The depth and length of the mounting groove 110 allow for sufficient movement of the snap-fit ​​member 1 within the groove. This facilitates the snap-fit ​​member 1's embedding into the groove, reducing installation difficulty. Furthermore, it allows the graphite indenter 100 to move relative to the snap-fit ​​member 1 during hoisting, reducing the restriction on the graphite indenter 100's posture and improving the ease of leveling the graphite indenter 100. Simultaneously, it disperses the force within the mounting groove 110, reducing the risk of breakage of the graphite indenter 100 during hoisting and achieving stable hoisting.

[0052] like Figure 5 , Figure 8 and Figure 9 As shown, since the snap-fit ​​1 and the sleeve 2 can move relative to each other, when the graphite pressure head 100 is lifted, the lowest point of the snap-fit ​​1 is lower than the lowest position of the sleeve 2. When the vacuum hot press furnace starts to work, the sleeve 2 is pressed down. At this time, the lower end of the snap-fit ​​1 will first contact the lower end of the mounting groove 110. If the pressing continues, the position of the snap-fit ​​1 will remain unchanged, and the sleeve 2 will continue to pressurize until it abuts the lower end of the mounting groove 110. By sequentially applying force and increasing the force-bearing area, the stress concentration is reduced, thereby reducing the squeezing damage of the snap-fit ​​1 and the sleeve 2 to the lower end of the mounting groove 110 of the graphite pressure head 100.

[0053] like Figure 5 and Figure 10As shown, optionally, the snap-fit ​​component 1 includes a plurality of snap-fit ​​parts 13, which are evenly distributed around the circumference of the mounting groove 110 and cooperate with each other. The distribution and cooperation of multiple snap-fit ​​parts 13 around the circumference of the mounting groove 110 facilitates the disassembly of the snap-fit ​​component 1, thereby improving the system's disassembly and maintenance efficiency. Furthermore, the circumferentially distributed snap-fit ​​parts 13 can more evenly bear the load from the hoisting process, thus avoiding the risk of fracture caused by stress concentration at a single point, and improving the safety and reliability of the graphite indenter 100 during hoisting. Since the minimum diameter of the mounting groove 110 of the graphite indenter 100 is smaller than the upper diameter of the graphite indenter 100, for ease of installation, the snap-fit ​​component 1 is composed of four quarter-circular snap-fit ​​parts 13, effectively improving installation efficiency. Compared to using a one-piece snap-fit ​​component 1, multiple arc-shaped snap-fit ​​parts 13 are assembled to form a ring-shaped snap-fit ​​component 1, which helps to reduce the difficulty of installation and disassembly, and at the same time reduces the risk of interference and uneven force caused by system leveling, process errors and graphite pressure head 100 offset.

[0054] like Figure 5 and Figure 10 As shown, optionally, the system also includes a reinforcing rib 3. The reinforcing rib 3 surrounds the outer periphery of the sleeve 2, and the snap-fit ​​member 1 and the reinforcing rib 3 are respectively located on the inner and outer sides of the sleeve 2. The reinforcing rib 3 is used to fasten the connection between the snap-fit ​​member 1 and the sleeve 2, increasing structural stability. The reinforcing rib 3 can be a ring-shaped member; the reinforcing rib 3 can effectively enhance the connection stability between the snap-fit ​​member 1 and the sleeve 2, thereby improving the reliability of the entire hoisting system and reducing safety hazards caused by loosening of the snap-fit ​​member 1 or the sleeve 2 during hoisting.

[0055] Optionally, the system also includes a heat-conducting component 4. The diameter of the connecting portion 21 is larger than the diameter of the upper end of the sleeve 2, and the length of the connecting portion 21 along the axial direction of the graphite pressure head 100 is greater than the length between the bottom end of the mounting groove 110 and the top end of the graphite pressure head 100. The heat-conducting component 4 is disposed inside the sleeve 2, with its upper end abutting against the upper end of the connecting portion 21, and its lower side disposed at the top end of the graphite pressure head 100. Along the direction perpendicular to the axial direction of the graphite pressure head 100, the cross-sectional area of ​​the heat-conducting component 4 is equal to the cross-sectional area of ​​the top end of the graphite pressure head 100, which helps to ensure uniform heating of the graphite pressure head 100. The heat-conducting component 4, through its high thermal conductivity, can ensure uniform heating of the graphite pressure head 100, reduce stress concentration caused by excessive temperature gradients, and lower the risk of breakage of the graphite pressure head 100. The heat-conducting component 4 can be a graphite felt, and multiple layers of the heat-conducting component 4 can be stacked to optimize the heat transfer effect.

[0056] like Figure 5 and Figure 10As shown, optionally, the system also includes a mandrel 5, which is disposed inside the sleeve 2. The mandrel 5 facilitates heat conduction, helping to ensure uniform heating of the graphite indenter 100. A groove 51 is provided on the outer circumference of the mandrel 5, creating a gap between the mandrel 5 and the inner wall of the sleeve 2. This circumferential gap of the mandrel 5 helps to make heat transfer more uniform, optimizes the heat transfer effect, reduces the risk of uneven heating and breakage of the graphite indenter 100, and improves the overall system's thermal conductivity, ensuring reliable hot pressing. The upper and lower ends of the mandrel 5 are fixedly connected to the inner wall of the sleeve 2 by welding.

[0057] like Figure 2 , Figure 5 and Figure 10 As shown, optionally, the heat-conducting component 4 and the mandrel 5 are connected by fasteners 6, with the lower end of the fastener 6 spaced apart from the top end of the graphite pressure head 100. The connection between the heat-conducting component 4 and the mandrel 5 via fasteners 6 ensures a stable connection and improves the structural stability of the entire system. The spaced-apart arrangement between the fastener 6 and the top end of the graphite pressure head 100 reduces localized stress concentration caused by the fastener 6 on the graphite pressure head 100, thereby reducing the risk of breakage of the graphite pressure head 100 during hoisting. Simultaneously, it also reduces the risk of surface damage to the graphite pressure head 100 caused by the fastener 6, which could affect the heat transfer uniformity and hot-pressing effect of the graphite pressure head 100. Multiple fasteners 6 can be provided, and the fasteners 6 can be screws.

[0058] Analysis using stress analysis software revealed that the maximum stress borne by the graphite indenter 100 during tension was 0.55 MPa, significantly improving the strength and stability of the structure and enhancing its resistance to failure compared to the existing structure's 0.89 MPa. The system's structural geometry is relatively flexible, its core purpose being to resist bending and shear failure at the upper end of the mounting groove 110 of the graphite indenter 100. Therefore, reinforcing the structure in directions perpendicular to the predetermined fracture surface can improve the fracture resistance of the graphite indenter 100. Furthermore, the flexible design of the snap-fit ​​component 1 and the sleeve component 2 is not limited by geometric parameters, as long as the system's stability and safety are met. In other embodiments, extended designs include, but are not limited to, changing the inclination angles of the inclined surface 120 and the inclined portion 11, changing the dimensions of the snap-fit ​​component 1, and changing the number of reinforcing ribs 3. It is understood that the system also includes necessary structures for connection, support, drive, positioning, limiting, and control functions to ensure normal operation; the shape, size, material, and quantity of each part of the system can be determined as needed to achieve the corresponding functions.

[0059] The implementation principle of the vacuum autoclave hoisting system for preventing graphite indenter breakage in this embodiment of the application is as follows: The snap-fit ​​component 1 connects to the mounting groove 110. The lower end of the sleeve component 2 is fitted onto the outer periphery of the snap-fit ​​component 1 via the connecting part 21 and connected through the connecting component, improving the force balance on the snap-fit ​​component 1. The sleeve component 2 can drive the graphite indenter 100 to move through the snap-fit ​​component 1, reducing excessive local stress, improving hoisting safety, and extending the service life of the graphite indenter 100. An inclined surface 120 is provided at the top of the mounting groove 110 of the graphite indenter 100, and the inclined surface 120 is connected to a pre-set breakage point of the graphite indenter 100. With the surfaces parallel, the inclined portion 11 of the snap-fit ​​1 cooperates with the inclined surface 120. The inclined portion 11 and the inclined surface 120 in the mounting groove 110 are closely attached to form a stable contact surface, which improves stability. During the movement of the graphite indenter 100, the force exerted by the snap-fit ​​1 on the graphite indenter 100 is set at an angle with the inclined surface 120. During the hoisting process, the stress at the mounting groove 110 is effectively dispersed, and the force along the inclined surface 120 is reduced, thereby reducing the generation of shear stress along the preset fracture surface and avoiding the graphite indenter 100 from breaking due to stress concentration, thereby reducing the risk of fracture of the preset fracture surface.

[0060] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A vacuum autoclave hoisting system for preventing graphite indenter breakage, wherein the upper outer circumference of the graphite indenter (100) is provided with an installation groove (110), characterized in that, The top of the mounting groove (110) is provided with an inclined surface (120). The inclined surface (120) makes the bottom area of ​​the mounting groove (110) near the axis of the graphite pressure head (100) smaller than the opening area of ​​the mounting groove (110) away from the axis of the graphite pressure head (100). The inclined surface (120) is parallel to the preset fracture surface of the graphite pressure head (100). The vacuum hot press furnace hoisting system for preventing graphite pressure head breakage includes: A snap-fit ​​component (1) is provided, which is circumferentially disposed in the mounting groove (110). The snap-fit ​​component (1) is detachably connected to the mounting groove (110). The upper end of the snap-fit ​​component (1) is provided with an inclined portion (11). The inclined portion (11) has the same inclination angle as the inclined surface (120). The inclined portion (11) can fit against the inclined surface (120). A sleeve (2) is provided at its lower end with a connecting part (21), the inner diameter of the connecting part (21) being greater than or equal to the outer diameter of the snap-fit ​​(1), and the sleeve (2) being fitted onto the outer periphery of the snap-fit ​​(1). A connector, which connects the snap-fit ​​member (1) and the sleeve member (2) respectively; The top of the mounting groove (110) is provided with a limiting surface (130). Along the direction perpendicular to the axis of the graphite pressure head (100), the limiting surface (130) is located between the groove opening of the mounting groove (110) and the inclined surface (120). The limiting surface (130) and the inclined surface (120) are set at an angle, so that the groove area of ​​the end of the limiting surface (130) near the axis of the graphite pressure head (100) is greater than or equal to the groove opening area. The upper end of the snap-fit ​​member (1) is provided with a limiting part (12), which can fit with the limiting surface (130). The snap-fit ​​member (1) is provided with a first connecting hole (14), and the sleeve member (2) is provided with a second connecting hole (22). The second connecting hole (22) is correspondingly provided with the first connecting hole (14). The length of the second connecting hole (22) along the axis of the graphite indenter (100) is greater than the length of the first connecting hole (14) along the axis of the graphite indenter (100). The connector is fixedly connected to the first connecting hole (14), and the second connecting hole (22) is movably connected to the connector, so that the sleeve member (2) can move relative to the snap-fit ​​member (1) along the axis of the graphite indenter (100).

2. The vacuum hot autoclave hoisting system for preventing graphite indenter breakage according to claim 1, characterized in that, Along the direction perpendicular to the axis of the graphite indenter (100), the depth of the mounting groove (110) is greater than the thickness of the snap-fit ​​member (1), so that a gap can be left between the snap-fit ​​member (1) and the bottom of the mounting groove (110); along the direction of the axis of the graphite indenter (100), the length of the snap-fit ​​member (1) is less than the length of the mounting groove (110).

3. The vacuum hot autoclave hoisting system for preventing graphite indenter breakage according to claim 1, characterized in that, The snap-fit ​​component (1) includes a plurality of snap-fit ​​parts (13), which are evenly distributed around the mounting groove (110), and the plurality of snap-fit ​​parts (13) cooperate with each other.

4. The vacuum hot autoclave hoisting system for preventing graphite indenter breakage according to claim 1, characterized in that, It also includes a reinforcing rib (3), which surrounds the outer periphery of the sleeve (2). The snap-fit ​​member (1) and the reinforcing rib (3) are respectively disposed on the inner and outer sides of the sleeve (2). The reinforcing rib (3) is used to fasten the connection between the snap-fit ​​member (1) and the sleeve (2).

5. The vacuum hot autoclave hoisting system for preventing graphite indenter breakage according to claim 1, characterized in that, It also includes a heat-conducting component (4), the diameter of the connecting part (21) is greater than the diameter of the upper end of the sleeve (2), along the axial direction of the graphite pressure head (100), the length of the connecting part (21) is greater than the length between the bottom end of the mounting groove (110) and the top end of the graphite pressure head (100), the heat-conducting component (4) is disposed inside the sleeve (2), the upper end of the heat-conducting component (4) abuts against the upper end of the connecting part (21), the lower side of the heat-conducting component (4) is disposed at the top end of the graphite pressure head (100), along the direction perpendicular to the axial direction of the graphite pressure head (100), the cross-sectional area of ​​the heat-conducting component (4) is equal to the cross-sectional area of ​​the top end of the graphite pressure head (100).

6. The vacuum hot autoclave hoisting system for preventing graphite indenter breakage according to claim 5, characterized in that, It also includes a mandrel (5), which is disposed inside the sleeve (2). The outer periphery of the mandrel (5) is provided with a groove (51), which leaves a gap between the mandrel (5) and the inner wall of the sleeve (2).

7. The vacuum hot autoclave hoisting system for preventing graphite indenter breakage according to claim 6, characterized in that, The heat-conducting component (4) is connected to the mandrel (5) by a fastener (6), and the fastener (6) is spaced apart from the top of the graphite pressure head (100).

8. The vacuum hot autoclave hoisting system for preventing graphite indenter breakage according to claim 1, characterized in that, The top of the sleeve (2) is provided with a flange (7), which is used to connect the lifting structure and the lifting structure is used to drive the flange (7) to move.

Images