Vacuum hot pressing furnace hoisting system capable of preventing graphite pressure head from being broken

Abstract

The invention relates to a vacuum hot-pressing furnace hoisting system capable of preventing a graphite pressing head from being fractured, and belongs to the technical field of hoisting equipment of vacuum hot-pressing furnaces. The graphite pressure head comprises a clamping piece, a sleeve piece and a connecting piece, an inclined face is arranged at the top end of a mounting groove, the inclined face enables the groove bottom area, close to the axis of the graphite pressure head, of the mounting groove to be smaller than the groove opening area, away from the axis of the graphite pressure head, of the mounting groove, and the inclined face is parallel to the fracture face of the graphite pressure head; an inclined part is arranged at the upper end of the clamping piece, the inclined angle of the inclined part is the same as that of the inclined surface, and the inclined part can be attached to the inclined surface; a connecting part is arranged at the lower end of the sleeve piece, the inner diameter of the connecting part is larger than or equal to the outer diameter of the clamping piece, and the sleeve piece is arranged on the periphery of the clamping piece in a sleeving mode; the connecting piece is connected with the clamping piece and the sleeve piece. The graphite pressing head has the effect that the problem that the graphite pressing head is prone to breakage during moving is solved.

Description

Technical Field

[0001] The present application relates to the technical field of hoisting equipment for vacuum hot pressing furnaces, and in particular to a hoisting system for vacuum hot pressing furnaces for preventing graphite pressing heads from breaking. Background Art

[0002] Vacuum hot pressing furnace is a kind of equipment that heats and pressurizes materials under 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 by reducing oxidation and pollution under high temperature and high pressure conditions. The vacuum hot pressing furnace is mainly composed of furnace body, furnace door, heating and heat preservation and temperature measurement system, vacuum system, inflation system, water cooling system, control system, hydraulic system, etc. The vacuum hot pressing furnace is a cycle operation type and is widely used in hot pressing and sintering of cemented carbide, functional ceramics, powder metallurgy, etc. under high temperature and high vacuum conditions. It can also be hot pressed and sintered under inflation protection.

[0003] Graphite pressure head is a key component in vacuum hot pressing furnace, which is used to transmit pressure and heat. Graphite is widely used in vacuum hot pressing furnace because of its good thermal conductivity and high temperature resistance. Figure 1 As shown, the graphite press head 100' is generally cylindrical in shape, and a slot 110' is provided on the top to connect to a lifting device, and the annular buckle cooperates with the slot 110' so that the annular buckle can be driven to move by the lifting device during operation, and the graphite press head 100' is lifted by the annular buckle sleeved in the slot 110'.

[0004] However, although graphite has good high temperature resistance and thermal conductivity, it is relatively brittle and has low tensile strength. In the related art, the upper and lower end surfaces of the slot 110' are both right-angle structures, which is not conducive to stress dispersion, increasing the risk of stress concentration at the slot 110' during lifting, and the stress concentration phenomenon increases the risk of fracture, making the slot 110' prone to fracture when subjected to concentrated stress.

[0005] In the above-mentioned related technologies, there is a defect that the graphite indenter is prone to breakage when moving. Summary of the invention

[0006] In order to improve the problem that a graphite pressing head is prone to breakage when moving, the present application provides a vacuum hot pressing furnace hoisting system that prevents the graphite pressing head from breaking.

[0007] The vacuum hot pressing furnace hoisting system for preventing graphite pressing head from breaking provided by the present application adopts the following technical solution: A vacuum hot pressing furnace hoisting system for preventing a graphite press head from breaking, wherein a mounting groove is provided on the outer circumference of the upper end of the graphite press head, and a slope is provided on the top of the mounting groove, wherein the slope makes the bottom area of ​​the mounting groove close to the axis of the graphite press head smaller than the notch area of ​​the mounting groove away from the axis of the graphite press head, so that the slope is parallel to the fracture surface of the graphite press head. The vacuum hot pressing furnace hoisting system for preventing a graphite press head from breaking comprises: a clamping member, wherein the clamping member is provided on the mounting groove, wherein the clamping member is detachably connected to the mounting groove, wherein an inclined portion is provided on the upper end of the clamping member, wherein the inclined portion has the same inclination angle as the inclined surface, and wherein the inclined portion can fit the inclined surface; a sleeve member, wherein a connecting portion is provided on the lower end of the sleeve member, wherein the inner diameter of the connecting portion is greater than or equal to the outer diameter of the clamping member, and the sleeve member is sleeved on the outer circumference of the clamping member; and a connecting member, wherein the connecting member connects the clamping member and the sleeve member respectively.

[0008] By adopting the above technical scheme, an inclined surface is set at the top of the installation groove of the graphite pressure head, and the inclined surface is parallel to the fracture surface of the graphite pressure head, so that the force acting on the inclined surface can be set at an angle with the fracture surface, which helps to reduce the risk of fracture; the clamping piece is connected to the installation groove, and the lower end of the sleeve piece is sleeved on the outer periphery of the clamping piece through the connecting part, and the connection is achieved through the connecting piece. On the one hand, it helps to improve the reliability of the connection between the clamping piece and the installation groove. On the other hand, being sleeved on the outer periphery of the clamping piece can improve the force balance of the clamping piece and facilitate the driving effect on the clamping piece. By reducing the situation of excessive local force, it is helpful to improve the safety of lifting and extend the service life of the graphite press head; the inclined part of the clamping piece cooperates with the inclined surface, and the inclined part is closely fitted with the inclined surface in the installation groove to form a stable contact surface, which improves the stability. In the process of driving the graphite press head to move, the force of the clamping piece on the graphite press head is set at an angle with the inclined surface, which effectively disperses the stress of the installation groove during the lifting process, reduces the force along the inclined surface, avoids the fracture of the graphite press head caused by stress concentration, and thus reduces the risk of fracture of the fracture surface.

[0009] Optionally, a limiting surface is provided at the top of the mounting groove, and the limiting surface is provided between the notch of the mounting groove and the inclined surface along a direction perpendicular to the axis of the graphite press head. The limiting surface and the inclined surface are arranged at an angle so that the groove area of ​​the end of the limiting surface close to the axis of the graphite press head is greater than or equal to the notch area, and a limiting portion is provided at the upper end of the clamping part, and the limiting portion can fit with the limiting surface.

[0010] By adopting the above technical scheme, on the basis of setting the inclined plane, by setting the limit surface and cooperating with the limit part, the unilateral stress increase, sudden mechanical stress and transient tensile stress caused by the leveling error when the graphite pressure head is lifted can be effectively reduced, and the risk of the graphite pressure head slipping and misaligning with the clamping part during the lifting process and causing the clamping part to fall out can be reduced, which helps to make the lifting process smoother and improve the safety and reliability of the lifting.

[0011] Optionally, the clamping member is provided with a first connecting hole, and the sleeve member is provided with a second connecting hole, the second connecting hole is arranged corresponding to the first connecting hole, the length of the second connecting hole along the axis direction of the graphite press head is greater than the length of the first connecting hole along the axis direction of the graphite press head, the connecting member is fixedly connected to the first connecting hole, and the second connecting hole is movably connected to the connecting member, so that the sleeve member can move relative to the clamping member along the axis direction of the graphite press head.

[0012] By adopting the above technical scheme, since the first connecting hole and the second connecting hole are correspondingly arranged, and the connection between the first connecting hole and the second connecting hole is achieved through the same connecting piece, and the length of the second connecting hole along the axis of the graphite press head is greater than that of the first connecting hole, when the sleeve member lifts the graphite press head, the clamping member can move relative to the sleeve member along the axis of the graphite press head, thereby helping to automatically level the graphite press head connected by the clamping member under the action of its own gravity, so that the stress on the installation groove is balanced, and the possibility of uneven force caused by the inclination of the graphite press head is reduced, thereby reducing the risk of the graphite press head breaking due to stress concentration during the lifting process.

[0013] Optionally, along the direction perpendicular to the axis of the graphite press head, the depth of the mounting groove is greater than the thickness of the clamping piece, so that a gap can be left between the clamping piece and the bottom of the mounting groove; along the axis of the graphite press head, the length of the clamping piece is less than the length of the mounting groove.

[0014] By adopting the above technical scheme, the depth and length of the installation groove are set so that the clamping part can leave a movable margin in the installation groove. On the one hand, it is convenient to embed the clamping part into the installation groove, reducing the difficulty of installation. On the other hand, it can allow the graphite pressing head to have movable space relative to the clamping part during the lifting process, reduce the degree of posture restriction of the graphite pressing head by the clamping part, and improve the convenience of leveling the graphite pressing head; at the same time, it can also disperse the force in the installation groove, reduce the risk of breakage of the graphite pressing head during the lifting process, and achieve smooth lifting.

[0015] Optionally, the clamping member includes a plurality of clamping portions, the plurality of clamping portions are evenly distributed in the circumference of the mounting groove, and the plurality of clamping portions cooperate with each other.

[0016] By adopting the above technical solution, multiple clips are distributed around the installation groove and cooperate with each other, so that the clips are easy to disassemble, thereby improving the disassembly and maintenance efficiency of the system; and, several circumferentially distributed clips can more evenly bear the load from the lifting process, thereby avoiding the risk of fracture caused by stress concentration at a single point, and improving the safety and reliability of the graphite press head during the lifting process.

[0017] Optionally, it further includes reinforcing ribs, which are arranged around the outer circumference of the sleeve member, and the clamping member and the reinforcing ribs are respectively arranged on the inner and outer sides of the sleeve member, and the reinforcing ribs are used to fasten the clamping member and the sleeve member.

[0018] By adopting the above technical solution, the reinforcing ribs can effectively enhance the connection stability between the clamping part and the sleeve part, thereby improving the reliability of the entire lifting system and reducing the safety hazards caused by the loosening of the clamping part or the sleeve part during the lifting process.

[0019] Optionally, a heat conductive part is further included, wherein the diameter of the connecting portion is larger than the diameter of the upper end of the sleeve portion, and along the axial direction of the graphite press head, the length of the connecting portion is larger than the length between the bottom end of the mounting groove and the top end of the graphite press head. The heat conductive part is arranged in the sleeve portion, and the upper end of the heat conductive part abuts against the upper end of the connecting portion. The lower side of the heat conductive part is arranged at the top end of the graphite press head. Along the direction perpendicular to the axial direction of the graphite press head, the cross-sectional area of ​​the heat conductive part is equal to the cross-sectional area of ​​the top end of the graphite press head.

[0020] By adopting the above technical solution, the heat conducting member can heat the graphite indenter evenly through its high heat conduction efficiency, reduce stress concentration caused by excessive temperature gradient, and reduce the risk of graphite indenter breakage.

[0021] Optionally, it further comprises a core shaft, which is arranged in the sleeve member, and a groove is arranged on the outer circumference of the core shaft, and the groove leaves a gap between the core shaft and the inner wall of the sleeve member.

[0022] By adopting the above technical solution, the core shaft can facilitate heat conduction, which helps to make the graphite pressing head heated evenly; the circumferential gap of the core shaft helps to make the heat transfer more uniform, reducing the risk of the graphite pressing head breaking due to uneven heating, while improving the thermal conductivity of the overall system and ensuring the reliable implementation of hot pressing processing.

[0023] Optionally, the heat conducting member is connected to the core shaft via a fastener, and the fastener is spaced apart from the top end of the graphite pressing head.

[0024] By adopting the above technical solution, the heat conductor and the core shaft are connected by fasteners to ensure a stable connection between the two and improve the structural stability of the entire system; at the same time, the spacing between the fasteners and the top of the graphite press head can reduce the local stress concentration caused by the fasteners on the graphite press head, thereby reducing the risk of the graphite press head breaking during the lifting process; at the same time, it can also reduce the risk of the fasteners damaging the surface of the graphite press head and affecting the heat transfer uniformity and hot pressing effect of the graphite press head.

[0025] Optionally, a flange is provided at the top of the sleeve member, and the flange is used to connect to a lifting structure, and the lifting structure is used to drive the flange to move.

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

[0027] In summary, the present application includes at least one of the following beneficial technical effects: 1. An inclined plane is set at the top of the mounting groove of the graphite pressure head, and the inclined plane is parallel to the fracture surface of the graphite pressure head, so that the force acting on the inclined plane can be set at an angle with the fracture surface, which helps to reduce the risk of fracture; the clamping piece is connected to the mounting groove, and the lower end of the sleeve piece is sleeved on the outer periphery of the clamping piece through the connecting part, and the connection is achieved through the connecting piece. On the one hand, it helps to improve the reliability of the connection between the clamping piece and the mounting groove. On the other hand, being sleeved on the outer periphery of the clamping piece can improve the force balance of the clamping piece, and facilitate the driving effect on the clamping piece, thereby reducing the local The inclined part of the clamping piece cooperates with the inclined surface, and the inclined part and the inclined surface in the installation groove are closely attached to form a stable contact surface. While improving the stability, the clamping piece can make the force of the graphite press head at an angle with the inclined surface in the process of driving the graphite press head to move, which effectively disperses the stress of the installation groove during the lifting process, reduces the force along the inclined surface, avoids the fracture of the graphite press head caused by stress concentration, and thus reduces the risk of fracture of the fracture surface; 2. On the basis of setting the inclined plane, by setting the limit surface and cooperating with the limit part, the unilateral stress increase, sudden mechanical stress and transient tensile stress caused by the leveling error when the graphite pressure head is lifted can be effectively reduced, so that the risk of the graphite pressure head slipping and dislocating with the clamping part during the lifting process and causing the clamping part to fall out can be reduced, which helps to make the lifting process more stable and improve the safety and reliability of the lifting; 3. Since the first connecting hole and the second connecting hole are arranged correspondingly, and the connection between the first connecting hole and the second connecting hole is achieved through the same connecting piece, and the length of the second connecting hole along the axis of the graphite press head is greater than the first connecting hole, when the sleeve member lifts the graphite press head, the clamping member can move relative to the sleeve member along the axis of the graphite press head, which helps to automatically level the graphite press head connected by the clamping member under the action of its own gravity, balances the stress on the installation groove, reduces the possibility of uneven force caused by the inclination of the graphite press head, and thus reduces the risk of the graphite press head breaking due to stress concentration during the lifting process. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of a graphite indenter in the related art.

[0029] Figure 2 It is a schematic diagram of a vacuum hot pressing furnace hoisting system for preventing graphite pressing head from breaking according to an embodiment of the present application.

[0030] Figure 3 Schematic diagram of a graphite indenter according to an embodiment of the present application.

[0031] Figure 4 It is a top view of a vacuum hot pressing furnace hoisting system for preventing graphite pressing head from breaking according to an embodiment of the present application.

[0032] Figure 5 yes Figure 4 Cross-section view at AA in the middle.

[0033] Figure 6 It is a front view of the sleeve member according to an embodiment of the present application.

[0034] Figure 7 yes Figure 6 Cross-section view at the middle BB.

[0035] Figure 8 It is a schematic diagram of the sleeve part pulling the graphite pressing head according to an embodiment of the present application.

[0036] Fig. 9 It is a schematic diagram of the sleeve member pressing down the graphite pressure head in an embodiment of the present application.

[0037] Fig.10 It is a schematic diagram of a hidden sleeve component of a vacuum hot pressing furnace hoisting system for preventing graphite pressing head from breaking according to an embodiment of the present application.

[0038] Description of reference numerals: 100', graphite pressure head; 110', slot; 100, graphite pressure head; 110, mounting groove; 120, inclined surface; 130, limiting surface; 1, clamping part; 11, inclined part; 12, limiting part; 13, clamping part; 14, first connecting hole; 2, sleeve part; 21, connecting part; 22, second connecting hole; 3, reinforcing rib; 4, heat conducting part; 5, core shaft; 51, groove; 6, fastener; 7, flange. DETAILED DESCRIPTION

[0039] The following is combined with Figure 1 -Attached Fig.10 The present application is further described in detail. In this embodiment, if not clearly specified, "connected", "connected" and "fixed" are understood in a broad sense, 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 elements, etc., which can be understood according to the specific circumstances.

[0040] In the present application, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or the first and second features being in contact not directly but through another feature between them. Moreover, in the description of the present embodiment, the terms "above", "below", "right", etc., the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise specified, the orientation words used in the present application, such as "inside" and "outside", refer to the contours of the corresponding parts themselves.

[0041] like Figure 2 , Figure 3 and Figure 4As shown, after analyzing the strength of the graphite indenter 100, the embodiment of the present application discloses a vacuum hot pressing furnace hoisting system (hereinafter referred to as "system") for preventing the graphite indenter from breaking by judging the force mode of the graphite indenter 100 and analyzing the damage surface structure, which is used to reduce the risk of the graphite indenter 100 breaking. Preferably, the upper end of the graphite indenter 100 is provided with a mounting groove 110 on the outer circumference. By performing a force analysis on the actual force state of the graphite indenter 100, the corresponding material parameters and combined dimensions are input into the static stress simulation software, and the corresponding boundary conditions and force conditions are set. Finally, the stress-strain distribution of the graphite indenter 100 is obtained by simulation calculation, and the bending state and stress direction of the edge of the mounting groove 110 of the graphite indenter 100 during the tensile process are obtained; combined with the fracture surface direction of the graphite indenter 100 in the actual project, it is determined that the fracture position of the graphite indenter 100 is most likely to occur at the mounting groove 110 on the upper edge of the graphite indenter 100, and the fracture surface is a shear surface in an inclined direction. Through stress analysis, simulation and comparative analysis of actual failure surfaces, this embodiment performs targeted optimization and protection of the structure and system at the maximum stress surface of the graphite press head 100 during tension, so as to improve the stability of the lifting system of the graphite press head 100.

[0042] like Figure 2 , Figure 3 and Figure 5 As shown, the system includes a clamping part 1, a sleeve part 2 and a connecting part, which are used to cooperate with the cylindrical graphite pressing head 100 to achieve lifting, and the shear surface, that is, the fracture surface of the graphite pressing head 100 is reinforced and protected to increase stability, so that the graphite pressing head 100 can be lifted or driven to be pressed downward, thereby completing the hot pressing process and reducing the risk of fracture of the graphite pressing head 100.

[0043] like Figure 2 , Figure 3 and Figure 5As shown, the upper peripheral ring of the graphite press head 100 is provided with a mounting groove 110, and the clamping part 1 is arranged in the mounting groove 110. The mounting groove 110 is an annular groove, and the clamping part 1 is an annular structure. When the graphite press head 100 is hoisted, the upper end of the mounting groove 110 of the graphite press head 100 is subjected to the tensile stress of the clamping part 1 in an upward direction; at the same time, the graphite press head 100 is subjected to its own gravity in a downward direction. During the lifting process, the mounting groove 110 of the graphite press head 100 will bend and deform under the combined force; due to the force form of the eccentricity, the upper edge of the graphite press head 100 is subjected to a huge shearing effect at the same time, so in actual use, the upper end of the graphite press head 100 is prone to fracture, and the damage position and fracture surface are similar to the 45° shear crack surface. Therefore, in order to improve the strength and stability of the graphite press head 100 during the hoisting process, it is necessary to increase the strength of the mounting groove 110 of the graphite press head 100 in a direction perpendicular to the shear stress, alleviate the stress concentration phenomenon at the top of the mounting groove 110 of the graphite press head 100, and reduce the occurrence of damage. In this embodiment, a bevel 120 is provided at the top of the mounting groove 110. The setting of the bevel 120 makes the bottom area of ​​the mounting groove 110 close to the axis of the graphite press head 100 smaller than the notch area of ​​the mounting groove 110 away from the axis of the graphite press head 100, so that the bevel 120 is parallel to the fracture surface of the graphite press head 100. Since the fracture surface of the graphite press head 100 is mostly inclined at an angle of 45°, in this embodiment, the inclination angle of the bevel 120 can be 45°, and the bevel 120 is parallel to the fracture surface, which can make the direction of the force perpendicular to the fracture surface or set at an angle with the fracture surface, thereby dispersing and reducing the shear stress generated along the fracture surface, reducing the risk of fracture of the fracture surface, and improving reliability. In other embodiments, the inclination angle of the inclined surface 120 can be adaptively adjusted according to the actual angle of the fracture surface to meet the use requirements.

[0044] like Figure 2 , Figure 3 and Figure 5As shown, the clamping member 1 is annularly arranged in the mounting groove 110, and the clamping member 1 is detachably connected to the mounting groove 110. An inclined portion 11 is arranged at the upper end of the clamping member 1, and the inclined portion 11 has the same inclination angle as the inclined surface 120. The inclined portion 11 can fit the inclined surface 120, so that the acting force can be perpendicular to the inclined surface 120, that is, the acting force is perpendicular to the direction of the shear stress, thereby reducing the shear stress generated along the fracture surface direction and reducing the fracture risk of the graphite indenter 100. The inclined portion 11 of the clamping member 1 cooperates with the inclined surface 120, and the inclined portion 11 is tightly fitted with the inclined surface 120 in the installation groove 110 to form a stable contact surface. While improving stability, the clamping member 1 can make the force of the graphite pressing head 100 be set at an angle with the inclined surface 120 in the process of moving the graphite pressing head 100, effectively dispersing the stress at the installation groove 110 during the lifting process, reducing the force along the direction of the inclined surface 120, avoiding the breakage of the graphite pressing head 100 caused by stress concentration, and thus reducing the risk of breakage of the graphite pressing head 100.

[0045] like Figure 5 , Figure 6 and Figure 7 As shown, the lower end of the sleeve member 2 is provided with a connecting portion 21, which is an annular groove structure, the inner diameter of the connecting portion 21 is greater than or equal to the outer diameter of the clamping member 1, the sleeve member 2 is sleeved on the outer periphery of the clamping member 1, and the connecting member is used to connect the clamping member 1 and the sleeve member 2. The clamping member 1 is connected to the mounting groove 110, and the lower end of the sleeve member 2 is sleeved on the outer periphery of the clamping member 1 through the connecting portion 21, and the connection is realized through the connecting member. On the one hand, the force bearing area is increased by the ring shape, which helps to improve the reliability of the connection between the clamping member 1 and the mounting groove 110; on the other hand, being sleeved on the outer periphery of the clamping member 1 can improve the force balance of the clamping member 1, and facilitate the driving effect of the clamping member 1, and by reducing the situation of excessive local force, it helps to improve the hoisting safety and extend the service life of the graphite press head 100. The system has a simple structure and a low manufacturing cost, can conveniently realize the hoisting of the graphite press head 100, and reduce the risk of the graphite press head 100 breaking.

[0046] like Figure 2 , Figure 3 and Figure 5As shown, optionally, a flange 7 is provided at the top of the sleeve member 2. The flange 7 is used to connect the lifting structure, and the lifting structure is used to drive the flange 7 to move. The flange 7 is used to connect the sleeve member 2 and the lifting structure, and the lifting structure can drive the flange 7 to move, thereby realizing safe and convenient lifting of the graphite press head 100. The lifting structure drives the graphite press head 100 by driving the sleeve member 2 and the clamping member 1. Compared with the form of directly connecting the lifting structure with the graphite press head 100 through an annular buckle, the relative mobility between the sleeve member 2, the clamping member 1 and the graphite press head 100 can improve the ability of the graphite press head 100 to automatically level, which helps to balance the force of the graphite press head 100 and reduce the risk of breakage. The lifting structure adopts an existing structure, which can realize the movement of the flange 7.

[0047] During the hoisting process, the setting of the inclined surface 120 can ensure the stability of the system through friction, but in order to prevent the unilateral stress increase, sudden mechanical stress and transient tensile stress caused by the leveling error of the graphite press head 100 from causing the graphite press head 100 to slip and dislocate with the clamping member 1 during the hoisting process, the present embodiment is provided with a limiting surface 130 at the top of the mounting groove 110. Optionally, along the direction perpendicular to the axis of the graphite press head 100, the limiting surface 130 is arranged between the notch of the mounting groove 110 and the inclined surface 120. The limiting surface 130 is arranged at an angle with the inclined surface 120, so that the groove area of ​​the limiting surface 130 at one end close to the axis of the graphite press head 100 is greater than or equal to the notch area. The upper end of the clamping member 1 is provided with a limiting portion 12, and the limiting portion 12 can fit with the limiting surface 130. In the present embodiment, the limiting surface 130 is perpendicular to the axis of the graphite press head 100. The edge of the limiting surface 130 can be rounded. By setting the limiting surface 130, the risk of slippage and dislocation during the lifting process can be reduced, and the structural safety can be increased. On the basis of setting the inclined surface 120, by setting the limiting surface 130 and cooperating with the limiting portion 12, the increase in unilateral stress, sudden mechanical stress and transient tensile stress caused by the leveling error when the graphite pressing head 100 is lifted can be effectively reduced, and the risk of slippage and dislocation between the graphite pressing head 100 and the clamping part 1 during the lifting process, which causes the clamping part 1 to fall out, helps to make the lifting process more stable and improve the safety and reliability of the lifting.

[0048] like Figure 2 , Figure 3 and Figure 5As shown, optionally, the clamping member 1 is provided with a first connection hole 14, and the sleeve member 2 is provided with a second connection hole 22, and the second connection hole 22 is arranged corresponding to the first connection hole 14 to achieve connection. Before hoisting, the sleeve member 2, the clamping member 1, the graphite press head 100 and other components are installed respectively. In the actual assembly process, the leveling error caused by the process accuracy will cause the graphite press head 100 to have a lateral deviation during the lifting and pressing process. The inclination caused by this leveling will further cause the graphite press head 100 to be subjected to uneven force, and produce greater stress concentration on the inclined side of the graphite press head 100, thereby increasing the risk of fracture. In addition, during the pressing process, the clamping member 1 has an extrusion effect on the lower end of the mounting groove 110, and the stress concentration problem caused by the extrusion will also increase the risk of fracture of the graphite press head 100. Therefore, in this embodiment, the length of the second connection hole 22 along the axis direction of the graphite press head 100 is greater than the length of the first connection hole 14 along the axis direction of the graphite press head 100, the connecting member is fixedly connected to the first connection hole 14, and the second connection hole 22 is movably connected to the connecting member, so that the sleeve member 2 can move relative to the clamping member 1 along the axis direction of the graphite press head 100. The first connection hole 14 is a threaded hole, and the connecting member can be a bolt, which is screwed to the first connection hole 14 through the bolt, and the end of the bolt is spaced apart from the graphite press head 100.

[0049] Since the first connection hole 14 and the second connection hole 22 are arranged correspondingly, and the connection between the first connection hole 14 and the second connection hole 22 is achieved through the same connection piece, and the length of the second connection hole 22 along the axis of the graphite press head 100 is greater than the first connection hole 14, when the sleeve member 2 lifts the graphite press head 100, the clamping member 1 can move relative to the sleeve member 2 along the axis of the graphite press head 100, thereby helping the graphite press head 100 connected by the clamping member 1 to automatically level under its own gravity, so that the stress on the mounting groove 110 is balanced, and the possibility of uneven force caused by the inclination of the graphite press head 100 is reduced, thereby reducing the risk of the graphite press head 100 breaking due to stress concentration during the lifting process. The open combination structure of the clamping member 1 and the sleeve member 2 helps to automatically adjust the problems of graphite press head 100 offset and side slip caused by leveling errors and process errors.

[0050] like Figure 5 , Figure 6 and Figure 7As shown, the first connection hole 14 can be a circular hole, and the second connection hole 22 is an elliptical hole; the first connection hole 14 and the second connection hole 22 can be set in multiple, evenly distributed in the circumference of the clamping member 1 and the sleeve member 2, which is conducive to force balance; the first connection hole 14 and the second connection hole 22 are set in a one-to-one correspondence. Among them, the first connection hole 14 is a circular threaded hole with a diameter of 10mm, and the sleeve member 2 is an elliptical hole with a concentric axis, so that in the process of hoisting the graphite press head 100, the sleeve member 2 and the clamping member 1 are more freely in contact. If there is an offset caused by process problems such as adjustment, this flexible matching system can allow the graphite press head 100 to be automatically corrected by gravity factors to ensure uniform force.

[0051] like Figure 5 , Figure 8 and Fig. 9 As shown, optionally, along the direction perpendicular to the axis of the graphite press head 100, the depth of the mounting groove 110 is greater than the thickness of the clip 1, so that a gap can be left between the clip 1 and the bottom of the mounting groove 110. Along the axis of the graphite press head 100, the length of the clip 1 is less than the length of the mounting groove 110. The depth and length of the mounting groove 110 are set so that the clip 1 can leave a margin of activity in the mounting groove 110. On the one hand, it is convenient to embed the clip 1 into the mounting groove 110, reducing the difficulty of installation; on the other hand, it can make the graphite press head 100 have a movable space relative to the clip 1 during the hoisting process, reduce the degree of posture restriction of the clip 1 on the graphite press head 100, and improve the convenience of leveling the graphite press head 100. At the same time, it can also disperse the force in the mounting groove 110, reduce the risk of fracture of the graphite press head 100 during the hoisting process, and achieve smooth hoisting.

[0052] like Figure 5 , Figure 8 and Fig. 9 As shown, since the clamping member 1 and the sleeve member 2 can move relative to each other, when the graphite pressing head 100 is lifted, the lowest point of the clamping member 1 is lower than the lowest position of the sleeve member 2; when the vacuum hot pressing furnace starts to work, the sleeve member 2 is pressed down, and at this time, the lower end of the clamping member 1 will first contact the lower end of the mounting groove 110. If the downward pressure continues at this time, the position of the clamping member 1 remains unchanged, and the sleeve member 2 continues to be pressurized until it abuts against the lower end of the mounting groove 110. By sequentially applying force and increasing the force-bearing area, stress concentration is reduced, thereby reducing the extrusion damage of the clamping member 1 and the sleeve member 2 to the lower end of the mounting groove 110 of the graphite pressing head 100.

[0053] like Figure 5 and Fig.10As shown, optionally, the clamping member 1 includes a plurality of clamping portions 13, and the plurality of clamping portions 13 are evenly distributed around the circumference of the mounting groove 110, and the plurality of clamping portions 13 cooperate with each other. The plurality of clamping portions 13 are distributed around the circumference of the mounting groove 110 and cooperate with each other, so that the clamping member 1 is easy to disassemble, thereby improving the disassembly and assembly efficiency and maintenance efficiency of the system. In addition, the plurality of clamping portions 13 distributed around the circumference can more evenly bear the load from the hoisting process, thereby avoiding the risk of fracture caused by stress concentration at a single point, and improving the safety and reliability of the graphite press head 100 during the hoisting process. Since the minimum diameter of the mounting groove 110 of the graphite press head 100 is smaller than the upper end diameter of the graphite press head 100, for easy installation, the clamping member 1 is composed of four quarter-circular clamping portions 13, which effectively improves the installation efficiency. Compared with an integrated clamping component 1, multiple arc-shaped clamping portions 13 assembled to form an annular clamping component 1 help to reduce the difficulty of installation and disassembly, while reducing the risks of interference and uneven force caused by problems such as system leveling, process errors and graphite press head 100 offset.

[0054] like Figure 5 and Fig.10 As shown, optionally, the system further includes a reinforcing rib 3. The reinforcing rib 3 is arranged around the outer periphery of the sleeve member 2, and the clamping member 1 and the reinforcing rib 3 are arranged on the inner and outer sides of the sleeve member 2, respectively. The reinforcing rib 3 is used to fasten the clamping member 1 and the sleeve member 2 to increase the structural stability. The reinforcing rib 3 can be an annular member; the reinforcing rib 3 can effectively enhance the connection stability between the clamping member 1 and the sleeve member 2, thereby improving the reliability of the entire lifting system and reducing the potential safety hazards caused by the loosening of the clamping member 1 or the sleeve member 2 during the lifting process.

[0055] Optionally, the system further includes a heat conductor 4. The diameter of the connecting portion 21 is greater than the diameter of the upper end of the sleeve member 2, and along the axial direction of the graphite press head 100, the length of the connecting portion 21 is greater than the length between the bottom end of the mounting groove 110 and the top end of the graphite press head 100. The heat conductor 4 is arranged in the sleeve member 2, the upper end of the heat conductor 4 abuts the upper end of the connecting portion 21, and the lower side of the heat conductor 4 is arranged at the top end of the graphite press head 100. In the direction perpendicular to the axis of the graphite press head 100, the cross-sectional area of ​​the heat conductor 4 is equal to the cross-sectional area of ​​the top end of the graphite press head 100, which helps to make the graphite press head 100 heated evenly. The heat conductor 4 can make the graphite press head 100 heated evenly through its higher thermal conductivity, reduce the stress concentration caused by excessive temperature gradient, and reduce the risk of fracture of the graphite press head 100. The heat conductor 4 can be a graphite felt, and the heat conductor 4 can be provided with several layers, and the multi-layer heat conductor 4 is stacked to optimize the heat transfer effect.

[0056] like Figure 5 and Fig.10As shown, optionally, the system also includes a mandrel 5, which is arranged in the sleeve member 2. The mandrel 5 can facilitate heat conduction, which helps to make the graphite press head 100 heated evenly. A groove 51 is provided on the outer periphery of the mandrel 5, and the groove 51 leaves a gap between the mandrel 5 and the inner wall of the sleeve member 2. The circumferential gap of the mandrel 5 helps to make the heat transfer more uniform, optimize the heat transfer effect, reduce the risk of the graphite press head 100 being heated unevenly and broken, and at the same time, improve the thermal conductivity efficiency of the overall system and ensure the reliable implementation of hot pressing. The upper and lower ends of the mandrel 5 are fixedly connected to the inner wall of the sleeve member 2 by welding.

[0057] like Figure 2 , Figure 5 and Fig.10 As shown, optionally, the heat conductor 4 is connected to the mandrel 5 by a fastener 6, and the lower end of the fastener 6 is spaced apart from the top of the graphite press head 100. The heat conductor 4 is connected to the mandrel 5 by a fastener 6 to ensure a stable connection between the two and improve the structural stability of the entire system. The fastener 6 is spaced apart from the top of the graphite press head 100 to reduce the local stress concentration caused by the fastener 6 on the graphite press head 100, thereby reducing the risk of the graphite press head 100 breaking during the lifting process. At the same time, it can also reduce the risk of the fastener 6 damaging the surface of the graphite press head 100 and affecting the heat transfer uniformity and hot pressing effect of the graphite press head 100. Multiple fasteners 6 can be provided, and the fasteners 6 can be screws.

[0058] After analysis by force analysis software, during the tensile process, the maximum stress value borne by the graphite indenter 100 is 0.55MPa, which is significantly improved compared to the 0.89MPa of the existing structure, and the strength and stability of the structure are greatly improved, and the ability to resist damage is improved. The structural geometric parameters of the system are relatively flexible, and its core purpose is to resist the bending and shear damage of the upper end of the mounting groove 110 of the graphite indenter 100. Therefore, the structural protection is enhanced in the direction perpendicular to the fracture surface, and the ability of the graphite indenter 100 to resist fracture can be improved. In addition, the flexibility design of the clamping member 1 and the sleeve member 2 is also not limited to geometric parameters, as long as the stability and safety of the system can be met. In other embodiments, the extended design includes but is not limited to changing the inclination angle of the inclined surface 120 and the inclined portion 11, changing the size of the clamping member 1, and changing the number of reinforcing ribs 3. It is understandable that the system also includes necessary structures for connection, support, drive, positioning, limiting and control functions so that the system can operate normally; the parameters such as the shape, size, material and setting quantity of each part of the system can be determined as needed to achieve the corresponding functions.

[0059] The implementation principle of the vacuum hot pressing furnace hoisting system for preventing the graphite pressing head from breaking in the embodiment of the present application is as follows: the clamping member 1 is connected to the installation groove 110, the lower end of the sleeve member 2 is sleeved on the outer periphery of the clamping member 1 through the connecting portion 21, and the connection is achieved through the connecting member, so as to improve the force balance of the clamping member 1, and the sleeve member 2 can drive the graphite pressing head 100 to move through the clamping member 1, thereby reducing the situation of excessive local force, improving the hoisting safety and extending the service life of the graphite pressing head 100; an inclined surface 120 is set at the top of the installation groove 110 of the graphite pressing head 100, and the inclined surface 120 is aligned with the fracture of the graphite pressing head 100. The crack surfaces are parallel, and the inclined portion 11 of the clamp 1 cooperates with the inclined surface 120. The inclined portion 11 and the inclined surface 120 in the installation groove 110 are closely attached to form a stable contact surface to improve stability. In the process of driving the graphite press head 100 to move, the force of the clamp 1 on the graphite press head 100 is set at an angle with the inclined surface 120, which effectively disperses the stress at the installation groove 110 during the lifting process, reduces the force along the direction of the inclined surface 120, thereby reducing the generation of shear stress along the fracture surface, avoiding the fracture of the graphite press head 100 caused by stress concentration, and thus reducing the risk of fracture of the fracture surface.

[0060] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A vacuum hot pressing furnace hoisting system for preventing graphite pressing head from breaking, wherein the upper peripheral ring of the graphite pressing head (100) is provided with a mounting groove (110), It is characterized in that The top of the installation groove (110) is provided with an inclined surface (120), and the inclined surface (120) makes the bottom area of ​​the installation groove (110) close to the axis of the graphite press head (100) smaller than the notch area of ​​the installation groove (110) away from the axis of the graphite press head (100), so that the inclined surface (120) is parallel to the fracture surface of the graphite press head (100). The vacuum hot pressing furnace hoisting system for preventing graphite press head fracture comprises: A clamping member (1), the clamping member (1) being arranged in an annular manner on the mounting groove (110), the clamping member (1) being detachably connected to the mounting groove (110), an inclined portion (11) being arranged at an upper end of the clamping member (1), the inclined portion (11) and the inclined surface (120) having the same inclination angle, and the inclined portion (11) being able to fit the inclined surface (120); A sleeve member (2), wherein a connecting portion (21) is provided at the lower end of the sleeve member (2), the inner diameter of the connecting portion (21) is greater than or equal to the outer diameter of the clamping member (1), and the sleeve member (2) is sleeved on the outer circumference of the clamping member (1); A connecting piece, wherein the connecting piece is respectively connected to the clamping piece (1) and the sleeve piece (2).

2. The vacuum hot pressing furnace hoisting system for preventing graphite pressing head from breaking according to claim 1, It is characterized in that A limiting surface (130) is provided at the top end of the installation groove (110). Along a direction perpendicular to the axis of the graphite pressure head (100), the limiting surface (130) is provided between the notch of the installation groove (110) and the inclined surface (120). The limiting surface (130) and the inclined surface (120) are arranged at an angle so that the groove area of ​​the end of the limiting surface (130) close to the axis of the graphite pressure head (100) is greater than or equal to the notch area. A limiting portion (12) is provided at the upper end of the clamping member (1), and the limiting portion (12) can fit with the limiting surface (130).

3. The vacuum hot pressing furnace hoisting system for preventing graphite pressing head from breaking according to claim 1, It is characterized in that The clamping 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 arranged corresponding to the first connecting hole (14). The length of the second connecting hole (22) along the axis of the graphite press head (100) is greater than the length of the first connecting hole (14) along the axis of the graphite press head (100). The connecting member is fixedly connected to the first connecting hole (14), and the second connecting hole (22) is movably connected to the connecting member, so that the sleeve member (2) can move relative to the clamping member (1) along the axis of the graphite press head (100).

4. The vacuum hot pressing furnace hoisting system for preventing graphite pressing head from breaking according to claim 1, It is characterized in that Along a direction perpendicular to the axis of the graphite press head (100), the depth of the mounting groove (110) is greater than the thickness of the clamping piece (1), so that a gap can be left between the clamping piece (1) and the bottom of the mounting groove (110); along the axis of the graphite press head (100), the length of the clamping piece (1) is less than the length of the mounting groove (110).

5. The vacuum hot pressing furnace hoisting system for preventing graphite pressing head from breaking according to claim 1, It is characterized in that The clamping member (1) comprises a plurality of clamping portions (13), the plurality of clamping portions (13) being evenly distributed in the circumference of the installation groove (110), and the plurality of clamping portions (13) being matched with each other.

6. The vacuum hot pressing furnace hoisting system for preventing graphite pressing head from breaking according to claim 1, It is characterized in that The sleeve member (2) further comprises reinforcing ribs (3), wherein the reinforcing ribs (3) are arranged around the outer circumference of the sleeve member (2), the clamping member (1) and the reinforcing ribs (3) are arranged on the inner and outer sides of the sleeve member (2), and the reinforcing ribs (3) are used to fasten the clamping member (1) and the sleeve member (2).

7. The vacuum hot pressing furnace hoisting system for preventing graphite pressing head from breaking according to claim 1, It is characterized in that It also includes a heat-conducting member (4), wherein the diameter of the connecting portion (21) is greater than the diameter of the upper end of the sleeve member (2), and along the axial direction of the graphite press head (100), the length of the connecting portion (21) is greater than the length between the bottom end of the mounting groove (110) and the top end of the graphite press head (100), the heat-conducting member (4) is arranged in the sleeve member (2), the upper end of the heat-conducting member (4) abuts against the upper end of the connecting portion (21), the lower side of the heat-conducting member (4) is arranged at the top end of the graphite press head (100), and along the direction perpendicular to the axial direction of the graphite press head (100), the cross-sectional area of ​​the heat-conducting member (4) is equal to the cross-sectional area of ​​the top end of the graphite press head (100).

8. The vacuum hot pressing furnace hoisting system for preventing graphite pressing head from breaking according to claim 7, It is characterized in that It also comprises a core shaft (5), the core shaft (5) being arranged in the sleeve member (2), the outer periphery of the core shaft (5) being provided with a groove (51), the groove (51) leaving a gap between the core shaft (5) and the inner wall of the sleeve member (2).

9. The vacuum hot pressing furnace hoisting system for preventing graphite pressing head from breaking according to claim 8, It is characterized in that The heat conducting member (4) and the core shaft (5) are connected via a fastener (6), and the fastener (6) is spaced apart from the top end of the graphite pressing head (100).

10. The vacuum hot pressing furnace hoisting system for preventing graphite pressing head from breaking according to claim 1, It is characterized in that A flange (7) is provided at the top end of the sleeve member (2), and the flange (7) is used to connect to a lifting structure, and the lifting structure is used to drive the flange (7) to move.

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