Collaborative pressurization structure, self-repairing hot pressing device and high-voltage insulator forming process

Abstract

The present invention discloses a collaborative pressurizing structure, a self-repairing hot pressing device and a high-voltage insulator forming process, comprising a frame and a control mechanism, and also comprising an equipment main body installed in the inner cavity of the frame, a hot pressing mold installed in the inner cavity of the frame, a side slider comprising a slider main body and an inner conical surface arranged at one end of the slider main body, the inner conical surface being provided with a self-repairing component, four groups of auxiliary linkage mechanisms installed around the equipment main body, a main linkage mechanism installed at the bottom of the inner cavity of the frame, and a distance adjustment component installed at the top of the frame, for driving the upper slider to reciprocate along the axial direction of the mold sleeve. The present invention solves the problems of V-shaped umbrella edge and deep-edge umbrella skirt forming and demolding in one-piece molding by arranging a multi-slider mold, axially pressurizing the lower slider and the upper slider, and cooperating with the radial pressurizing of the side slider, thereby improving the overall uniformity and durability of the high-voltage insulator, and avoiding the problem of weak bonding between the umbrella skirt and the columnar bonding surface in step-by-step molding.

Description

Technical Field

[0001] The present invention relates to the technical field of insulator preparation equipment, and in particular to a coordinated pressurizing structure, a self-repairing hot pressing device and a high-voltage insulator forming process. Background Art

[0002] Hot presses induce physical and chemical changes in insulating materials through high temperature and high pressure, significantly improving the product's density, mechanical strength, and electrical performance. However, the complex geometric structures of high-voltage insulators (such as the combination of multiple functional sheds and a column) lead to two core issues: uneven material distribution: the edges of the sheds (such as those with deep-ribbed parachutes and aerodynamic parachutes) have significantly lower density than the column due to poor material flowability; and stress cracking during demolding: differential shrinkage stress between the molded part and the mold can easily cause cracking, especially in high-aspect-ratio sheds (such as those with sharp corners or grooves).

[0003] Patent CN202311393253.5 discloses an insulator production technology. By setting a rotatable movable part on the mold assembly, the mold body is controlled to rotate along the horizontal and vertical planes during the molding process, thereby improving the uniformity of raw material distribution and optimizing production quality.

[0004] Existing technologies use rotary molds to improve raw material distribution, but these still present drawbacks: high equipment requirements; maintaining multi-directional rotation under high temperature and pressure requires a precision control system, resulting in significant cost increases; insufficient stability; the dynamic molding process is prone to introducing bubbles or density gradients, affecting product consistency; and cracking is not addressed; rotation cannot eliminate stress concentration during demolding. In light of these issues, the present invention provides a multi-slider integrated molding mold that increases insulator density through multi-directional axial and radial pressure application, reduces cracking through distributed demolding with side sliders, and delays cone loss and extends the effective service life of the side sliders by using conical side sliders with self-repairing capabilities. Summary of the Invention

[0005] In order to solve the above technical problems, the present invention provides a collaborative pressurizing structure and a self-repairing hot pressing device. The technical solution of the present invention includes a frame and a control mechanism, and also includes:

[0006] The device body is installed in the inner cavity of the frame, and the device body includes a rear box body fixedly connected to the top of the inner cavity of the frame, a front box body hingedly connected to the side of the rear box body, and a heating, heat preservation and heat dissipation mechanism;

[0007] A hot pressing die is installed in the inner cavity of the frame, and the hot pressing die includes a die sleeve, an upper slider and a lower slider respectively connected to the two ends of the die sleeve in an axial sliding manner, and four sets of side sliders distributed circumferentially on the side wall of the die sleeve and radially connected to the die sleeve in a sliding manner;

[0008] The side slider includes a slider body and an inner conical surface provided at one end of the slider body. The inner conical surface is provided with a self-repairing component, which includes a porous structure, a wear-resistant layer, and a self-repairing capsule loaded in the porous structure.

[0009] Among them, the cone angle of the inner cone is 5°-10°;

[0010] Four sets of auxiliary linkage mechanisms are installed around the main body of the equipment. The auxiliary linkage mechanisms are electrically connected to the control mechanism to drive the side slider to reciprocate along the radial direction of the mold sleeve;

[0011] A main linkage mechanism is installed at the bottom of the inner cavity of the frame. The main linkage mechanism is electrically connected to the control mechanism to drive the lower slider to reciprocate along the axial direction of the mold sleeve;

[0012] The distance adjustment assembly installed on the top of the frame is used to drive the upper slider to reciprocate along the axial direction of the mold sleeve.

[0013] Furthermore, in the technical solution of the present invention, a hot pressing chamber is opened in the middle of the front box body and the rear box body. When the front box body and the rear box body are closed, installation grooves are opened at the same horizontal height in the middle of the four sides of the equipment body, and placement holes are opened along the radial bottom of the installation grooves. An adjustment channel connected to the hot pressing chamber is opened at the bottom of the placement hole.

[0014] Furthermore, in the technical solution of the present invention, the mold sleeve includes a mold sleeve main body, a mold cavity is opened inside the mold sleeve main body, an upper sliding hole and a lower sliding hole connected to the outside world are respectively opened at the top and bottom of the mold cavity, four groups of side sliding holes are opened circumferentially in the distribution interval of the mold cavity umbrella skirt, and an outer conical surface adapted to the inner conical surface is opened at one end of the side sliding hole connected to the mold cavity.

[0015] Furthermore, in the technical solution of the present invention, the upper slider is of the same diameter as the upper sliding hole and is slidably connected in the upper sliding hole, the lower slider is of the same diameter as the lower sliding hole and is slidably connected in the lower sliding hole, and the four groups of side sliders are of the same diameter as the side sliding holes and are respectively slidably connected in the side sliding holes.

[0016] Furthermore, in the technical solution of the present invention, the self-repairing component is prepared by the following steps:

[0017] Laser processing micropores: The inner cone surface is processed by femtosecond laser with a wavelength of 1030nm and a pulse energy of 50μJ to form a honeycomb microporous structure;

[0018] Vacuum impregnation: in 10 -3 Under a vacuum of 1.5 Pa, the inner cone surface is immersed in an ethanol solvent of a self-repairing capsule suspension, and the self-repairing capsule is pressed into the porous structure by capillary action. The self-repairing capsule is then taken out and dried to obtain an intermediate.

[0019] Surface sealing: A wear-resistant layer is deposited on the surface of the intermediate by atomic layer deposition (ALD).

[0020] Among them, the wear-resistant layer is more preferably an aluminum oxide film with a thickness of 5-10 nm.

[0021] Furthermore, in the technical solution of the present invention, the self-repairing capsule is prepared by the following steps:

[0022] Core material dispersion: Disperse the core material in the PI precursor solution with a solid content of 15%;

[0023] Atomization granulation: inlet temperature 180℃, outlet temperature 80℃, forming capsules with a particle size distribution of 1-3μm;

[0024] High temperature curing: heat treatment at 300℃ for 2 hours to crosslink and cure the capsule wall to obtain self-repairing capsules;

[0025] The number average molecular weight of the PI precursor is 5000-15000 g / mol, the dispersion is 1.1-1.6, the wall thickness of the self-healing capsule 2PI is 0.2μm, and the response mechanical stress strength is 15MPa±0.1MPa.

[0026] Furthermore, in the technical solution of the present invention, the self-repairing capsule includes a capsule wall and a capsule core wrapped in the capsule wall.

[0027] Furthermore, in the technical solution of the present invention, the capsule core is more preferably a MoS2 nanosheet, and the thickness of the MoS2 nanosheet layer is less than 10 nm.

[0028] Furthermore, in the technical solution of the present invention, the sub-linkage mechanism includes a hydraulic press detachably connected to the mounting groove, a linear bearing installed in the mounting hole, and a drive rod partially extending into the adjustment channel, and the hydraulic press drives the drive rod to perform reciprocating linear motion.

[0029] A high-voltage insulator forming process, using the above-mentioned hot pressing forming device, includes the following steps:

[0030] Loading: Place the lower slider in the lower sliding hole, leaving some margin, add the insulator material into the mold cavity from the upper sliding hole, vibrate until the filler height is within the upper sliding hole, place several groups of side sliders in the corresponding side sliding holes, and then push the upper slider along the upper sliding hole and compact it;

[0031] Mould installation: Place the filled hot pressing mould into the hot pressing chamber, and control the distance adjustment component and the main linkage mechanism to abut against the upper and lower ends of the hot pressing mould respectively. Close the front box, install the secondary linkage mechanism into the installation groove, and make the driving rod abut against the outer end of the side slider.

[0032] Program control: The secondary linkage mechanism synchronously drives several groups of side sliders to radially press into the light contact position, compacting the powder and sealing the mold cavity, with a pressure range of 5-10 MPa; heating to the target temperature, the main linkage mechanism simultaneously drives the downward sliding hole to move upward, applying pressure to the raw material in the mold cavity, with a pressure range of 100-300 MPa; the secondary linkage mechanism synchronously pressurizes the side slider to maintain radial pressure, with a pressure range of 20-90 MPa; during the heat and pressure holding stage, the side slider pressure is dynamically adjusted within a range of ±5 MPa;

[0033] Demoulding: After the temperature drops to room temperature, the auxiliary linkage mechanism controls the four groups of side sliders at the same level to retract synchronously by 0.3-0.5mm, and the two diagonal groups of side sliders to retract alternately by 2mm each. All side sliders retract synchronously until they are completely disengaged. The main linkage mechanism controls the removal of the pressure on the lower slider, opens the front box, takes out the hot pressing mold, removes each group of mold cores, opens the mold sleeve, takes out the hot pressing parts, and completes the hot pressing of the high-voltage insulator.

[0034] Effective gain: In the technical solution of the present invention, by providing a multi-slider mold, axial pressure is applied by the lower and upper sliders, and radial pressure is applied by the side sliders. This solves the problems of V-shaped shed edges and deep-ribbed sheds in one-piece molding and demoulding, improves the overall uniformity and durability of high-voltage insulators, and avoids the problem of weak bonding between the sheds and the columnar joint surface in step-by-step molding.

[0035] By arranging the inner conical surface and the outer conical surface inside the side sliding hole, a conical surface interlocking structure is formed to improve the sealing of the mold cavity and prevent powder leakage under high pressure;

[0036] The inner conical surface is processed by laser to form a porous structure, and a self-repairing capsule wrapped with MoS2 nanosheets is loaded inside the porous structure, and a wear-resistant layer is deposited on the outside of the porous structure. As the wear-resistant layer wears, when the shear force applied to the self-repairing capsule is ≥15MPa, the capsule wall ruptures and the capsule core is released to repair the inner conical surface, thereby increasing the effective service life of the inner conical surface.

[0037] Other features and advantages of the present invention will be set forth in the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0039] Figure 1 This is a schematic diagram of the structure of the cooperative pressurizing structure and the self-repairing hot pressing device of the present invention;

[0040] Figure 2This is a schematic diagram of the main structure of the device of the present invention;

[0041] Figure 3 Schematic diagram of the hot pressing mold structure of the present invention;

[0042] Figure 4 This is a schematic diagram of a half-section structure of the hot pressing mold sleeve of the present invention;

[0043] Figure 5 It is a schematic diagram of the cross-sectional structure of the side slider of the present invention;

[0044] Figure 6 For the present invention Figure 5 A is an enlarged structural diagram;

[0045] Figure 7 For the present invention Figure 6 A schematic diagram of the structure is enlarged at point B;

[0046] Figure 8 It is a schematic structural diagram of the auxiliary linkage mechanism of the present invention.

[0047] In the figure: 1 equipment main body, 11 front box body, 12 heating chamber, 13 hot pressing chamber, 14 insulation layer, 15 rear box body, 16 placement hole, 17 adjustment channel, 18 installation groove, 2 hot pressing mold, 21 lower slider, 22 mold sleeve, 221 mold sleeve main body, 222 upper sliding hole, 223 mold cavity, 224 side sliding hole, 225 lower sliding hole, 23 side slider, 231 slider main body, 232 inner cone surface, 233 porous structure, 234 wear-resistant layer, 235 self-repairing capsule, 2351 capsule wall, 2352 capsule core, 24 upper slider, 3 main linkage mechanism, 4 secondary linkage mechanism, 41 hydraulic press, 42 linear bearing, 43 drive rod, 5 frame, 6 distance adjustment component. DETAILED DESCRIPTION

[0048] In order to make the purpose, features, and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0049] On the one hand, an embodiment of the present invention proposes a collaborative pressurizing structure and a self-repairing hot pressing device, including an equipment body 1, a hot pressing mold 2, a main linkage mechanism 3, four sets of secondary linkage mechanisms 4, a frame 5, a distance adjustment component 6 and a control component.

[0050] See also Figure 1The distance adjustment component 6 is installed on the top of the frame 5, and after adjustment, it abuts the upper end of the hot pressing mold 2. The main linkage mechanism 3 is installed at the bottom of the inner cavity of the frame 5 to provide axial driving force for the hot pressing mold 2. The equipment body 1 is installed at the top of the inner cavity of the frame 5, which is used for heating, heat preservation and constant temperature of the hot pressing mold 2. The hot pressing mold 2 is installed in the inner cavity of the equipment body 1. The four groups of auxiliary linkage mechanisms 4 are respectively installed in the middle position of the side wall of the equipment body 1 to provide radial driving force for the hot pressing mold 2.

[0051] See also Figure 2 The device body 1 includes a rear box body 15 fixedly connected to the top of the inner cavity of the frame 5 and a front box body 11 hingedly connected to one side of the rear box body 15. The front box body 11 and the rear box body 15 in the closed state together form a rectangular parallelepiped A. A hot pressing chamber 13 is opened in the middle of the rectangular parallelepiped A. A heating chamber 12, an insulation layer 14 and a heat dissipation component are coaxially arranged on the outside of the hot pressing chamber 13 in sequence. The heating chamber 12 and the heat dissipation component are electrically connected to the control component for controlling the internal temperature of the hot pressing chamber 13.

[0052] Specifically, the four groups of side surfaces of the rectangular parallelepiped A are each provided with a mounting groove 18 , a placement hole 16 is provided at the bottom of the mounting groove 18 close to the hot pressing chamber 13 , and an adjustment channel 17 communicating with the hot pressing chamber 13 is provided at the bottom of the placement hole 16 .

[0053] It should be noted that, since the rectangular body A includes a front box body 11 and a rear box body 15, two groups of mounting grooves 18 are respectively opened on the side opposite to each other of the front box body 11 and the rear box body 15, namely, the front and rear end faces of the rectangular body A, and the other two groups of mounting grooves 18 are opened on the two sides jointly formed by the front box body 11 and the rear box body 15, namely, the left and right side faces of the rectangular body A. That is to say, the mounting grooves 18, placement holes 16 and adjustment channels 17 located on the left and right side faces of the rectangular body A have the same shape as the front and rear end faces when the front box body 11 and the rear box body 15 are closed. When the front box body 11 is opened, the mounting grooves 18, placement holes 16 and adjustment channels 17 are separated by the connecting surface of the front box body 11 and the rear box body 15 as the axis of symmetry, half of which are opened on the side wall of the front box body 11, and half of which are opened on the side wall of the rear box body 15. The heights of the four groups of mounting grooves 18 are consistent.

[0054] See also Figures 3 and 4 The hot pressing mold 2 includes a mold sleeve 22, and the upper and lower ends of the mold sleeve 22 are axially slidably connected to an upper slider 24 and a lower slider 21, and the side wall of the mold sleeve 22 is radially slidably connected to four groups of side sliders 23.

[0055] It should be noted that the four groups of side sliders 23 are located at the same horizontal height, and the adjacent two groups are arranged at 90° intervals, which together constitute a side slider series to radially pressurize a certain height area. In other embodiments, multiple groups of side slider series with different horizontal heights can be set according to needs in the V-shaped umbrella edge, deep-ribbed umbrella skirt or other areas that are difficult to form or demold.

[0056] Specifically, the mold sleeve 22 includes a mold sleeve main body 221, a mold cavity 223 is opened inside the mold sleeve main body 221, and an upper sliding hole 222 and a lower sliding hole 225 connected to the outside world are respectively opened at the top and bottom of the mold cavity 223, and four groups of side sliding holes 224 are circumferentially spaced apart on the side wall of the umbrella skirt of the mold cavity 223, and an outer cone surface is opened on the side of the side sliding hole 224 close to the mold cavity 223.

[0057] It should be noted that the mold sleeve 22 is provided with a parting line, which divides the mold sleeve 22 into two groups along the axis longitudinally, and the parting line is provided between two adjacent groups of side sliding holes 224.

[0058] See also Figures 5 to 7 The side slider 23 includes a slider body 231, an inner conical surface 232 is provided at one end of the slider body 231, and a self-repairing component is provided on the outer wall of the inner conical surface 232. The self-repairing component includes a porous structure 233, a self-repairing capsule 235 loaded inside the porous structure 233, and a wear-resistant layer 234 deposited on the outer wall of the porous structure 233.

[0059] Furthermore, the inner conical surface 232 has a conical surface angle of 5°-10° and is adapted to the outer conical surface of the side sliding hole 224 .

[0060] Specifically, the self-repairing capsule 235 includes a capsule core 2352 and a capsule wall 2351 wrapped around the capsule core 2352 .

[0061] Furthermore, the self-repairing capsule 235 is prepared as follows:

[0062] Core material dispersion: MoS2 nanosheets with a layer thickness of less than 10 nm are dispersed in the PI precursor solution with a solid content of 15%;

[0063] Specifically, the PI precursor has a number-average molecular weight of 5,000-15,000 g / mol and a dispersity of 1.1-1.6. A molecular weight that is too low results in insufficient mechanical strength of the capsule wall, with a rupture stress of less than 0.5 MPa. A molecular weight that is too high results in a viscosity greater than 500 cP, making emulsification difficult. Excessive dispersity leads to uneven capsule wall thickness, while insufficient dispersity can cause crystallization brittle fracture.

[0064] Atomization granulation: inlet temperature 180℃, outlet temperature 80℃, forming capsules with a particle size distribution of 1-3μm;

[0065] Specifically, the PI wall thickness of the self-repairing capsule 235 is 0.2 μm ± 0.01 μm, and the fracture stress strength is 15 MPa ± 0.1 MPa.

[0066] High temperature curing: heat treatment at 300°C for 2 hours to crosslink and cure the capsule wall to obtain self-repairing capsule 235.

[0067] Furthermore, the self-repairing component is prepared by the following steps:

[0068] Laser processing micropores: using a femtosecond laser with a wavelength of 1030 nm and a pulse energy of 50 μJ, the surface of the inner cone 232 is laser processed for 30-50 femtoseconds to form a honeycomb microporous structure 233;

[0069] Vacuum impregnation: in 10 -3 Under a vacuum of Pa, the inner cone 232 is immersed in an ethanol solvent of a suspension of the self-repairing capsules 235, and the self-repairing capsules 235 are pressed into the porous structure 233 by capillary action, and then taken out and dried to obtain an intermediate;

[0070] Specifically, the self-repairing capsules 235 flow into the porous structure 233 through electrostatic adsorption and capillary action, and are confined by the complex pores in the porous structure 233 . After drying, the self-repairing capsules 235 adhere to the inside of the porous structure 233 .

[0071] Surface sealing: A wear-resistant layer 234 with a thickness of 5-10 nm and a composition of aluminum oxide is deposited on the surface of the intermediate by atomic layer deposition (ALD).

[0072] Specifically, by depositing an aluminum oxide film, the outside of the porous structure 233 to which the self-repairing capsules 235 are attached is sealed. As the wear-resistant layer 234 wears, when some of the self-repairing capsules 235 are broken by mechanical action, the released MoS2 nanosheets repair the inner conical surface 232, thereby improving the accuracy of the inner conical surface 232 and extending the effective service life of the inner conical surface 232.

[0073] See also Figure 8 The secondary linkage mechanism 4 includes a hydraulic press 41 detachably mounted in the mounting groove 18, a linear bearing 42 mounted in the mounting hole 16, and a drive rod 43 partially extending into the adjustment channel 17. The hydraulic press 41 drives the drive rod 43 to extend and retract, pushing the side slide 23 to slide radially, thereby radially pressurizing the material.

[0074] It should be noted that the hydraulic press 41 can be disassembled and assembled with the mounting groove 18 by means of existing technologies such as riveting and fixing blocks, and the stability of the hydraulic press 41 after assembly is ensured.

[0075] A molding process for high-voltage insulators, using the above-mentioned hot pressing device, comprises the following steps:

[0076] Loading: Place the lower slider 21 in the lower slide hole 225, leaving some excess, add the insulator material into the mold cavity 223 from the upper slide hole 222, and vibrate until the filler height is within the upper slide hole 222. Place several groups of side sliders 23 in the corresponding side slide holes 224, and then push the upper slider 24 along the upper slide hole 222 to compact it;

[0077] Mold installation: Place the loaded hot pressing mold 2 into the hot pressing chamber 13, and control the distance adjustment component 6 and the main linkage mechanism 3 to abut against the upper and lower ends of the hot pressing mold 2 respectively. Close the front box 11, and install the secondary linkage mechanism 4 into the installation groove 18, and make the driving rod 43 abut against the outer end of the side slider 23;

[0078] Program control: The secondary linkage mechanism 4 synchronously drives several groups of side sliders 23 to radially press into the light contact position, compacting the powder and sealing the mold cavity 223, with a pressure range of 5-10 MPa; heating to the target temperature, while the main linkage mechanism 3 drives the downward sliding hole 225 to move upward, applying pressure to the raw material in the mold cavity 223, with a pressure range of 100-300 MPa; the secondary linkage mechanism 4 synchronously pressurizes the side sliders 23 to maintain radial pressure, with a pressure range of 20-90 MPa; during the heat and pressure holding stage, the pressure of the side sliders 23 is dynamically adjusted within a range of ±5 MPa;

[0079] Demolding: After the temperature drops to room temperature, the auxiliary linkage mechanism 4 controls the four groups of side sliders 23 at the same level to synchronously retreat 0.3-0.5mm, and the two diagonal groups of side sliders 23 retreat alternately 2mm each. All side sliders 23 synchronously retreat until they are completely disengaged. The main linkage mechanism 3 controls the removal of the pressure of the lower slider 21, opens the front box 11, takes out the hot pressing mold 2, removes the mold cores of each group, opens the mold sleeve, takes out the hot pressing parts, and completes the hot pressing of the high-voltage insulator.

[0080] Principle: Place the lower slider 21 in the lower slide hole 225, and leave some margin, keep the side slide hole 224 open, add insulator raw material from the upper slide hole 222 into the mold cavity 223, vibrate and level it until the filler height is within the upper slide hole 222, place several groups of side sliders 23 in the corresponding side slide holes 224, and then push the upper slider 24 along the upper slide hole 222 to compact it, increase the filler amount at the umbrella skirt position, and thus increase the density of the complex structure part; place the filled hot pressing mold 2 in the hot pressing cavity 13, and control the distance adjustment component 6 and the main linkage mechanism 3 to respectively abut the upper and lower ends of the hot pressing mold 2, close the front box 11, and install the secondary linkage mechanism 4 into the installation groove 18, and make the driving rod 43 abut against the outer end of the side slider 23; the secondary linkage mechanism 4 synchronously drives several groups of side sliders 23 to radially press The mold cavity 223 is pressed into the light contact position, the powder is compacted and the mold cavity 223 is sealed, and the mold cavity 223 is heated to the target temperature. At the same time, the main linkage mechanism 3 drives the lower sliding hole 225 to move upward, pressurizing the raw material in the mold cavity 223. The auxiliary linkage mechanism 4 simultaneously pressurizes the side slider 23 to maintain the radial pressure and enter the heat preservation and pressure holding stage. After the temperature drops to room temperature, the auxiliary linkage mechanism 4 controls the four groups of side sliders 23 at the same level to synchronously retreat 0.3-0.5mm to release the stress at the root of the shed. The two diagonal groups of side sliders 23 alternately retreat 2mm each to prevent the shed from deformation and interference. All side sliders 23 synchronously retreat until they are completely disengaged. The main linkage mechanism 3 controls the removal of the pressure of the lower slider 21, opens the front box 11, takes out the hot pressing mold 2, removes the cores of each group, opens the mold sleeve, takes out the hot pressing part, and completes the hot pressing of the high-voltage insulator.

[0081] During the hot pressing process, the inner conical surface 232 rubs against the material and is subjected to the thermal expansion force of the material, and the wear-resistant layer 234 is worn. When the wear of the wear-resistant layer 234 reaches a certain extent, the porous structure 233 and the self-repairing capsule 235 inside it are partially exposed. When the self-repairing capsule 235 is subjected to a shear force ≥15MPa, the capsule wall 2351 ruptures, and the capsule core 2352 is released to repair the inner conical surface 232, thereby increasing the effective service life of the inner conical surface 232.

[0082] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely preferred examples of the present invention and are not intended to limit the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A high voltage insulator forming process, characterized in that: A self-repairing hot pressing device is included, and the self-repairing hot pressing device includes: A collaborative pressurizing structure comprises a hot pressing mold (2), wherein the hot pressing mold (2) comprises a mold sleeve (22), an upper slider (24) and a lower slider (21) respectively connected to the two ends of the mold sleeve (22) in an axial sliding manner, and four groups of side sliders (23) circumferentially distributed on the side wall of the mold sleeve (22) and radially connected to the mold sleeve (22); the side slider (23) comprises a slider body (231) and an inner conical surface (232) provided at one end of the slider body (231); a self-repairing component is provided on the surface of the inner conical surface (232), the self-repairing component comprises a porous structure (233), a wear-resistant layer (234) and a self-repairing capsule (235) loaded in the porous structure (233); and the cone angle of the inner conical surface (232) is 5°-10°. framework (5) and control mechanisms; A device body (1) is installed in the inner cavity of the frame (5), the device body (1) comprising a rear box body (15) arranged at the top of the inner cavity of the frame (5), a front box body (11) hingedly connected to the side of the rear box body (15), and a heating, heat preservation and heat dissipation mechanism; Four sets of auxiliary linkage mechanisms (4) are installed around the main body (1) of the device, and the auxiliary linkage mechanisms (4) are electrically connected to the control mechanism to drive the side slider (23) to move back and forth in a straight line along the radial direction of the mold sleeve (22); A main linkage mechanism (3) is installed at the bottom of the inner cavity of the frame (5), and the main linkage mechanism (3) is electrically connected to the control mechanism to drive the lower slider (21) to move back and forth in a straight line along the axial direction of the mold sleeve (22); A distance adjustment assembly (6) mounted on the top of the frame (5) is used to drive the upper slider (24) to move back and forth in a straight line along the axial direction of the mold sleeve (22); The following process steps are also included: Loading: Place the lower slider in the lower sliding hole, leaving some margin, and keep the side sliding hole open. Add the insulator material into the mold cavity from the upper sliding hole, vibrate until the filler height is within the upper sliding hole, place several groups of side sliders in the corresponding side sliding holes, and then push the upper slider along the upper sliding hole to compact; Mould installation: Place the filled hot pressing mould into the hot pressing chamber, and control the distance adjustment component and the main linkage mechanism to abut against the upper and lower ends of the hot pressing mould respectively. Close the front box, install the secondary linkage mechanism into the installation groove, and make the driving rod abut against the outer end of the side slider. Program control: The secondary linkage mechanism synchronously drives several groups of side sliders to radially press into the light contact position, compacting the powder and sealing the mold cavity, with a pressure range of 5-10 MPa; heating to the target temperature, the main linkage mechanism simultaneously drives the downward sliding hole to move upward, applying pressure to the raw material in the mold cavity, with a pressure range of 100-300 MPa; the secondary linkage mechanism synchronously pressurizes the side slider to maintain radial pressure, with a pressure range of 20-90 MPa; during the heat and pressure holding stage, the side slider pressure is dynamically adjusted within a range of ±5 MPa; Demoulding: After the temperature drops to room temperature, the auxiliary linkage mechanism controls the four groups of side sliders at the same level to retract synchronously by 0.3-0.5mm, and the two diagonal groups of side sliders to retract alternately by 2mm each. All side sliders retract synchronously until they are completely disengaged. The main linkage mechanism controls the removal of the pressure on the lower slider, opens the front box, takes out the hot pressing mold, removes each group of mold cores, opens the mold sleeve, takes out the hot pressing parts, and completes the hot pressing of the high-voltage insulator.

2. The high voltage insulator forming process according to claim 1, characterized in that: The mold sleeve (22) comprises a mold sleeve body (221), a mold cavity (223) is provided inside the mold sleeve body (221), an upper sliding hole (222) and a lower sliding hole (225) communicating with the outside are provided at the top and bottom of the mold cavity (223), four groups of side sliding holes (224) are provided in the circumferential direction of the umbrella skirt distribution area of ​​the mold cavity (223), and an outer conical surface adapted to the inner conical surface (232) is provided at one end of the side sliding hole (224) communicating with the mold cavity (223).

3. The high voltage insulator forming process according to claim 1, characterized in that: A hot pressing chamber (13) is provided in the middle of the front box body (11) and the rear box body (15). When the front box body (11) and the rear box body (15) are closed, mounting grooves (18) are provided at the same level in the middle of all four sides of the device body (1). A placement hole (16) is provided at the bottom of the mounting groove (18) along the radial direction. An adjustment channel (17) communicating with the hot pressing chamber (13) is provided at the bottom of the placement hole (16).

4. The high voltage insulator forming process according to claim 1, characterized in that: The self-repairing component is prepared by the following steps: Laser processing micropores: using a femtosecond laser with a wavelength of 1030 nm and a pulse energy of 50 μJ, the surface of the inner cone (232) is processed to form a honeycomb microporous structure (233); Vacuum impregnation: in 10 -3 Under a vacuum of 100 Pa, the inner cone (232) is immersed in an ethanol suspension of the self-repairing capsule (235), and the self-repairing capsule (235) is pressed into the porous structure (233) by capillary action, and then taken out and dried to obtain an intermediate; Surface sealing: depositing a wear-resistant layer on the surface of the intermediate by atomic layer deposition (234); The wear-resistant layer (234) is an aluminum oxide film with a thickness of 5-10 nm.

5. The high voltage insulator forming process according to claim 4, characterized in that: The self-repairing capsule (235) is prepared by the following steps: Core material dispersion: disperse the core material in the PI precursor solution with a solid content of 15%; Atomization granulation: inlet temperature 180℃, outlet temperature 80℃, forming capsules with a particle size distribution of 1-3μm; High temperature curing: heat treatment at 300°C for 2 hours to crosslink and cure the capsule wall to obtain self-repairing capsules (235); The number average molecular weight of the PI precursor is 5000-15000 g / mol, the dispersion is 1.1-1.6, the PI wall thickness of the self-healing capsule (235) is 0.2μm±0.1μm, and the response mechanical stress strength is 15MPa±0.1MPa.

6. The high voltage insulator forming process according to claim 5, characterized in that: The self-repairing capsule (235) comprises a capsule wall (2351) and a capsule core (2352) wrapped in the capsule wall (2351).

7. The high voltage insulator forming process according to claim 6, characterized in that: The capsule core (2352) is a MoS2 nanosheet, and the thickness of the MoS2 nanosheet is less than 10 nm.

8. The high voltage insulator forming process according to claim 1, characterized in that: The secondary linkage mechanism (4) comprises a hydraulic press (41) detachably connected to the mounting groove (18), a linear bearing (42) mounted in the mounting hole (16), and a drive rod (43) partially extending into the adjustment channel (17), wherein the hydraulic press (41) drives the drive rod (43) to perform reciprocating linear motion.

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