Preparation method and equipment of nanoscale high-temperature-resistant ceramicized silica gel sleeve

Abstract

The application discloses a kind of nanometer high-temperature-resistant ceramicized silica gel sleeve preparation method and equipment, it is related to silica gel material technical field, including the following steps: step one: silica gel, ceramic powder, fire-retardant powder, structure control agent and vulcanizing agent are mixed uniformly, and ceramicized silica gel raw material is obtained;Step two: ceramicized silica gel raw material is extruded using extruder, and the formed ceramicized silica gel sleeve is obtained;Step three: the formed ceramicized silica gel sleeve is sent into hot air vulcanization furnace and vulcanized, and the application is cut before the vulcanization of silica gel sleeve, in the vulcanization process, hot air can be fully contacted with the outer surface and internal surface of silica gel sleeve, improve the consistency of vulcanization degree of all parts of silica gel sleeve, to a certain extent, slow down the wrinkle situation of inner surface of silica gel sleeve, to improve the bonding degree of silica gel sleeve and conductor.

Description

Technical Field

[0001] This invention relates to the field of silicone material technology, specifically to a method and equipment for preparing nanoscale high-temperature resistant ceramicized silicone sleeves. Background Technology

[0002] Ceramicized silica gel is a new type of polymeric refractory material with excellent high temperature resistance, flame retardancy, low smoke, and non-toxicity. Its residue after combustion is a hard ceramicized shell that does not melt or drip in the high-temperature environment of a fire, making it suitable for fire-resistant locations and playing an important role in ensuring uninterrupted power transmission.

[0003] There is existing research on ceramicized silicone in the technology. For example, Chinese invention patent CN102220002B discloses a nano-scale high-temperature resistant ceramicized silicone formed by adding nano-scale materials to silicone rubber. It uses silicone rubber as the base material and adds nano-scale polymer composite filler, carbon black, structure control agent and vulcanizing agent. The proportions are as follows: based on 100 parts by weight of silicone rubber, 12-18 parts by weight of nano-scale polymer composite filler with an average particle size of 10nm-60nm, 8-12 parts by weight of carbon black, 0.8-1.2 parts by weight of structure control agent and 0.3-0.8 parts by weight of vulcanizing agent. For example, Chinese invention patent CN116063854A discloses a two-component flame-retardant ceramicized silicone and its preparation method and application. The two-component flame-retardant ceramicized silicone consists of component A and component B. Component A includes methyl vinyl silicone oil, ceramic powder, flame-retardant powder and catalyst. Component B includes methyl vinyl silicone oil, end-group hydrogen-containing silicone oil, ceramic powder, flame-retardant powder and inhibitor.

[0004] Chinese utility model patent with publication number CN206249928U discloses a ceramicized silicone electronic wire, comprising: several sets of conductors, an insulating sheath, a ceramicized silicone insulator, a cross-linked foamed polyethylene insulator, and a fireproof sleeve. The conductors are copper-clad aluminum core conductors. The insulating sheath is disposed outside the conductors, the ceramicized silicone insulator is disposed outside the insulating sheath, the cross-linked foamed polyethylene insulator is disposed outside the ceramicized silicone insulator, and the fireproof sleeve is disposed outside the cross-linked foamed polyethylene insulator.

[0005] In existing technologies, including the aforementioned patents, ceramicized silicone sleeves are produced by extruding ceramicized silicone into a mold using an extrusion device. After being shaped by the mold, the silicone is vulcanized, and then slits are made. The purpose of these slits is to facilitate pressing the conductor, which is wrapped with an insulating sheath, into the ceramicized silicone sleeve during subsequent processing. However, in actual production, due to the shrinkage of the silicone sleeve after vulcanization, and the inability of hot air to enter the interior of the silicone sleeve during the vulcanization process, the degree of vulcanization varies across the silicone sleeve. This results in different degrees of shrinkage (greater shrinkage at the outer edges than at the center). The inner surface of the shrunken silicone sleeve often exhibits... Figure 1 The wrinkles shown are problematic. These wrinkles prevent the silicone sleeve from fully adhering to the conductor encased in insulating sheath. Even with pressure applied to the silicone sleeve during later manufacturing processes using a fire-resistant sleeve, discontinuous gaps remain between the conductor and the silicone sleeve. Therefore, reducing wrinkles on the inner surface of the silicone sleeve after vulcanization to improve the adhesion between the silicone sleeve and the conductor is a technical problem that needs to be solved by those skilled in the art. Summary of the Invention

[0006] The purpose of this invention is to provide a method and equipment for preparing nanoscale high-temperature resistant ceramicized silicone sleeves, so as to overcome the above-mentioned shortcomings in the prior art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a method for preparing a nano-scale high-temperature resistant ceramicized silicone sleeve, comprising the following steps:

[0008] Step 1: Mix silicone, ceramic powder, flame retardant powder, structure control agent and vulcanizing agent evenly to obtain ceramicized silicone raw material;

[0009] Step 2: Extrude the ceramicized silicone raw material using an extruder to obtain a molded ceramicized silicone sleeve;

[0010] Step 3: Place the formed ceramicized silicone sleeve into a hot air vulcanizing furnace for vulcanization;

[0011] Step two is completed using a nano-level high-temperature resistant ceramicized silicone sleeve preparation device, which includes a connecting plate installed at the extruder outlet. The surface of the connecting plate is equipped with an outer cylinder and several round rods located inside the outer cylinder. The axes of the outer cylinder and the round rods are parallel to each other and perpendicular to the connecting plate. The outer cylinder is equipped with blades for cutting the ceramicized silicone sleeve. The number of blades is the same as the number of round rods and their positions correspond one-to-one.

[0012] As a preferred embodiment of the present invention, the outer cylinder is equipped with clamping blocks of the same number as the blades, the blades are fixedly mounted on the corresponding clamping blocks, and the clamping blocks slide in cooperation with the end face of the outer cylinder along the radial direction of the outer cylinder.

[0013] As a preferred embodiment of the present invention, a piercing assembly for piercing the ceramicized silicone sleeve is installed on the outer cylinder at the position corresponding to each blade. The piercing assembly includes a piercing needle that slides radially through the outer cylinder.

[0014] As a preferred embodiment of the present invention, the number of needles is two, and the positions of the two needles are arranged along the axial direction of the outer cylinder; a limiting frame is fixedly installed on the outer cylinder, and two sliders are slidably installed on the limiting frame along the radial direction of the outer cylinder, and the two needles are respectively fixedly installed on the two sliders.

[0015] As a preferred embodiment of the present invention, a rotating shaft is installed on the limiting frame, and a first connecting rod is fixedly installed at both ends of the rotating shaft. A second connecting rod is rotatably installed at the end of the slider away from the outer cylinder, and the second connecting rod is hinged to the corresponding first connecting rod.

[0016] As a preferred embodiment of the present invention, a driven gear is fixedly sleeved on the rotating shaft; a drive gear ring coaxial with the outer cylinder is rotatably mounted on the outer cylinder via a bracket, and the drive gear ring meshes with each driven gear.

[0017] As a preferred embodiment of the present invention, a rigid rod is fixedly installed on the slider near the corresponding clamping block in the piercing assembly, and the rigid rod is fixedly connected to the corresponding clamping block.

[0018] As a preferred embodiment of the present invention, the round rod is rotatably mounted on the connecting plate, and an anti-slip groove is provided on the circumferential surface of the round rod.

[0019] As a preferred embodiment of the present invention, a rotating block located inside the connecting plate is fixedly installed on the end face of the round rod. A pull wire is wound on the rotating block, and one end of the pull wire is fixedly connected to the rotating block, while the other end of the pull wire extends to the outside of the connecting plate. The rotating block and the connecting plate are connected by a torsion spring.

[0020] As a preferred embodiment of the present invention, a synchronizing rod is fixedly installed on the slider near the connecting plate in the piercing assembly, and the other end of the pull wire is fixedly connected to the corresponding synchronizing rod.

[0021] In the above technical solution, the present invention provides a method for preparing a nano-level high-temperature resistant ceramicized silicone sleeve. The silicone sleeve is cut before vulcanization. This allows hot air to fully contact the outer and inner surfaces of the silicone sleeve during vulcanization, improving the consistency of vulcanization throughout the sleeve and mitigating wrinkles on the inner surface. Furthermore, because the silicone sleeve has cuts before vulcanization, the cylindrical inner surface of the sleeve undergoes circumferential shrinkage during vulcanization, sharing some of the radial shrinkage and further mitigating wrinkles on the inner surface, thereby improving the adhesion between the silicone sleeve and the conductor. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0023] Figure 1 This is a cross-sectional view of the silicone sleeve and conductor in the background art;

[0024] Figure 2 This is a first perspective view of the equipment for preparing nanoscale high-temperature resistant ceramicized silicone sleeves in Example 1;

[0025] Figure 3 This is a second perspective view of the equipment for preparing nanoscale high-temperature resistant ceramicized silicone sleeves in Example 1;

[0026] Figure 4 This is a perspective view of the equipment for preparing nanoscale high-temperature resistant ceramicized silicone sleeves in Example 2;

[0027] Figure 5 This is a first perspective view of the equipment for preparing nanoscale high-temperature resistant ceramicized silicone sleeves in Example 3;

[0028] Figure 6 for Figure 5 Enlarged view of point A in the middle;

[0029] Figure 7 This is a second perspective view of the equipment for preparing nanoscale high-temperature resistant ceramicized silicone sleeves in Example 3;

[0030] Figure 8 for Figure 7 Enlarged view of point B in the middle;

[0031] Figure 9 This is a schematic diagram showing the working state of the two needles in Example 3;

[0032] Figure 10 This is a side sectional view of the round rod and connecting plate in Example 4;

[0033] Figure 11 This is a front sectional view of the rotating block and connecting plate in Example 4;

[0034] Figure 12 This is a three-dimensional schematic diagram of the equipment for preparing nanoscale high-temperature resistant ceramicized silicone sleeves in Example 4;

[0035] Figure 13 This is a three-dimensional schematic diagram of the equipment for preparing nanoscale high-temperature resistant ceramicized silicone sleeves in Example 5;

[0036] Figure 14 for Figure 13 Enlarged view of point C in the middle;

[0037] Figure 15 This is a schematic diagram of the powder blowing assembly in Example 5.

[0038] Explanation of reference numerals in the attached figures:

[0039] 1. Connecting plate; 101. Through groove; 2. Outer cylinder; 3. Round rod; 301. Anti-slip groove; 4. Blade; 5. Piercing assembly; 501. Piercing needle; 502. Limiting frame; 503. Slider; 504. Rotating shaft; 505. First connecting rod; 506. Second connecting rod; 507. Driven gear; 6. Drive gear ring; 7. Rigid rod; 8. Rotating block; 9. Pull wire; 10. Torsion spring; 11. Synchronizing rod; 12. Clamping block; 13. First air pipe; 14. Storage cavity; 15. Second air pipe; 16. First sealing plate; 17. Second sealing plate; 18. Connecting frame; 19. Magnet block; 20. Adjusting plate; 21. Guide groove; 22. Piston plate. Detailed Implementation

[0040] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0041] Example 1

[0042] This embodiment provides a method for preparing a nanoscale high-temperature resistant ceramicized silicone sleeve, the steps of which are as follows:

[0043] Step 1: Mix the silicone, ceramic powder, flame retardant powder, structure control agent and vulcanizing agent evenly to obtain ceramicized silicone raw material; this step is carried out using existing mixing equipment.

[0044] Step 2: The ceramicized silicone raw material is fed into the extruder and mixed again in the extruder. Then, the ceramicized silicone raw material is extruded using the extruder to obtain the shaped ceramicized silicone sleeve. The extruder used in this step is an existing extruder in the art.

[0045] Step 3: The formed ceramicized silicone sleeve is then placed into a hot air vulcanizing furnace for vulcanization; the hot air vulcanizing furnace in this step is an existing hot air vulcanizing furnace in this field.

[0046] Step two is completed using a nano-scale high-temperature resistant ceramicized silicone sleeve preparation device, which is located at the outlet of the extruder. Figure 2 and Figure 3As shown, it includes a connecting plate 1 fixedly installed at the outlet of the extruder by bolts. The connecting plate 1 is tightly fitted to the extruder. A through groove 101 is opened on the connecting plate 1, through which the raw material in the extruder is extruded under pressure. An outer cylinder 2 and several round rods 3 located within the inner range of the outer cylinder 2 are installed on the surface of the connecting plate 1. The outer cylinder 2 is fixedly connected to the connecting plate 1, and the end face of the outer cylinder 2 is tightly fitted to the connecting plate 1. The through groove 101 is located within the inner range of the outer cylinder 2. The axes of the outer cylinder 2 and the round rods 3 are parallel to each other and perpendicular to the connecting plate 1. A blade 4 for cutting the ceramicized silicone sleeve is installed on the outer cylinder 2. The number of blades 4 is the same as the number of round rods 3, and their positions correspond one-to-one.

[0047] In operation, the raw material in the extruder enters the outer cylinder 2 through the through-slot 101. Heating wires are installed in both the outer cylinder 2 and the cylindrical rod 3. During operation, the heating wires are energized, raising the temperature of the outer circumference of the cylindrical rod 3 and the inner circumference of the outer cylinder 2, thus preheating the raw material in the outer cylinder 2 and causing it to solidify. However, this process is insufficient for complete solidification; the raw material will still deform under external force and can move axially along the outer cylinder 2. As the extruded material gradually increases, filling the area inside the outer cylinder 2, subsequent material entering the outer cylinder 2 pushes the already filled material outwards along the outer cylinder 2's axial direction. The material exiting the outer cylinder 2 is in the shape of a silicone sleeve. During the process of the silicone sleeve exiting the outer cylinder 2, the blade 4 cuts the silicone sleeve, causing... A cut is formed on the silicone sleeve corresponding to each circular hole, extending radially along the silicone sleeve to the corresponding circular hole. In this way, during step three, hot air from the hot air vulcanizing furnace can enter the circular holes of the silicone sleeve through the cuts and contact the circumferential surface of the circular holes, thereby improving the consistency of vulcanization degree inside and outside the silicone sleeve and mitigating the formation of surface wrinkles at the circular holes to some extent. In addition, due to the presence of the cuts, during the vulcanization process, the inner surface of the circular holes of the silicone sleeve will not only undergo radial shrinkage but also a certain degree of circumferential shrinkage. That is, the circumferential shrinkage shares part of the radial shrinkage, and the circumferential shrinkage at the circular holes will not produce obvious wrinkles on the surface of the circular holes. This further mitigates the formation of wrinkles on the inner surface of the silicone sleeve, thereby improving the adhesion between the silicone sleeve and the conductor.

[0048] It should be noted that gaps will appear at the cut of the silicone sleeve after vulcanization. After the conductor is pressed onto the silicone sleeve later, the fireproof sleeve on the outside of the silicone sleeve will apply radial pressure to the silicone sleeve to eliminate the gaps. The silicone sleeve can still fully wrap the conductor and will not affect the performance of the silicone sleeve.

[0049] Furthermore, during the experiment, the designers discovered that the blade 4 not only cuts the silicone sleeve during contact but also supports and shapes it. The silicone sleeve removed from the outer cylinder 2 does not twist under the limiting effect of the blade 4 and can maintain its original shape as it enters the hot air vulcanizing furnace. During the radial cutting of the silicone sleeve by the blade 4, an axial force is also applied to the silicone sleeve. The axial force applied by all the blades 4 together causes the silicone sleeve to experience a certain resistance during its movement. This resistance slows down the overall movement speed of the silicone sleeve, allowing the raw material entering the outer cylinder 2 through the self-channel 101 to fully fill the outer cylinder 2, greatly reducing the generation of air holes inside the silicone sleeve and ensuring the integrity of the overall shape of the silicone sleeve.

[0050] Example 2

[0051] like Figure 4 As shown, based on the previous embodiment, in this embodiment, the outer cylinder 2 is equipped with clamping blocks 12 that are the same number as the number of blades 4 and correspond one-to-one. The blades 4 are fixedly installed on the corresponding clamping blocks 12, and the clamping blocks 12 slide in a radial fit with the end face of the outer cylinder 2. During the cutting process of the silicone sleeve by the blades 4, the clamping blocks 12 drive the blades 4 to move back and forth along the radial direction of the outer cylinder 2 under the action of external force, thereby making the blades 4 produce a sawing effect on the silicone sleeve. Since the silicone sleeve is still relatively soft and can deform during the cutting process of the blades 4, this sawing method will improve the flatness of the cut of the silicone sleeve and avoid significant deformation at the contact position between the silicone sleeve and the blades 4.

[0052] Example 3

[0053] To further reduce the deformation of the contact area between the silicone sleeve and the blade 4 due to compression during cutting, such as... Figure 5 and Figure 9 As shown, based on the previous embodiment, in this embodiment, a piercing assembly 5 for piercing the ceramicized silicone sleeve is installed on the outer cylinder 2 corresponding to the position of each blade 4. The piercing assembly 5 pre-drills holes in the silicone sleeve at the position to be cut before the blade 4 contacts the silicone sleeve. In this way, when the blade 4 cuts the silicone sleeve, the extrusion pressure from the blade 4 on the silicone sleeve is greatly reduced, which can basically avoid deformation at the cut. The piercing assembly 5 includes a piercing needle 501 that slides radially through the outer cylinder 2. There are two piercing needles 501, and the positions of the two piercing needles 501 are arranged along the axial direction of the outer cylinder 2. Specifically, the two piercing needles 501 alternately pierce the raw material under the action of external force, and there is always a piercing needle 501 in contact with the silicone sleeve. The piercing needle 501 moves at a fast speed, while the raw material moves at a slow speed. Therefore, the diameter of the hole pierced by the piercing needle 501 on the raw material is very close to the diameter of the piercing needle 501.

[0054] like Figure 6and Figure 8 As shown, in this embodiment, a limiting frame 502 is fixedly installed on the outer cylinder 2. Two sliders 503 are slidably installed on the limiting frame 502 along the radial direction of the outer cylinder 2. Two needles 501 are fixedly installed on the two sliders 503 respectively. A rotating shaft 504 is installed on the limiting frame 502. A first connecting rod 505 is fixedly installed at both ends of the rotating shaft 504. A second connecting rod 506 is rotatably installed at the end of the slider 503 away from the outer cylinder 2. The second connecting rod 506 is hinged to the corresponding first connecting rod 505.

[0055] In actual operation, the rotating shaft 504 rotates rapidly under the action of external force, causing the first connecting rod 505 at both ends to rotate synchronously. The first connecting rod 505 drives the second connecting rod 506 to move. Since the slider 503 is limited by the limiting frame 502, the end of the second connecting rod 506 connected to the slider 503 always moves back and forth along the sliding path of the slider 503. The slider 503 moves back and forth synchronously, and the needle 501 fixedly connected to the slider 503 moves synchronously with the corresponding slider 503.

[0056] It should be noted that the first connecting rods 505 at both ends of the rotating shaft 504 are arranged at an angle of 180°, that is, the two needles 501 always move in opposite directions, thus ensuring that at least one needle is always in contact with the raw material; the needles 501 in each piercing assembly 5 work together to block the movement of the raw material, so that the raw material is subject to a certain resistance during the movement. This resistance slows down the movement speed of the raw material. The raw material near the outlet of the outer cylinder 2 blocks the raw material near the through groove 101, so that the raw material entering the outer cylinder 2 from the through groove 101 can fully fill the outer cylinder 2, which greatly reduces the generation of air holes inside the silicone sleeve and ensures the integrity of the overall shape of the silicone sleeve.

[0057] like Figure 6 and Figure 8 As shown, a driven gear 507 is fixedly sleeved on the rotating shaft 504; a drive gear ring 6 coaxially mounted on the outer cylinder 2 via a bracket, and the drive gear ring 6 meshes with each driven gear 507; by external force, the drive gear ring 6 is driven to rotate stably at a constant speed, and the drive gear ring 6 drives each driven gear 507 meshing with it to rotate synchronously, and the driven gear 507 drives the rotating shaft 504 to rotate; thus, only a force needs to be applied to the drive gear ring 6 to drive each piercing assembly 5 to work synchronously.

[0058] like Figure 5 and Figure 7As shown, a rigid rod 7 is fixedly installed on the slider 503 near the corresponding clamping block 12 in the piercing assembly 5. The rigid rod 7 is fixedly connected to the corresponding clamping block 12. When the slider 503 moves back and forth, the clamping block 12 and the blade 4 move back and forth synchronously through the rigid rod 7. In this way, only a force needs to be applied to the drive gear ring 6 to make each piercing assembly 5 work synchronously and each blade 4 cut the silicone sleeve synchronously.

[0059] Example 4

[0060] To further improve the filling degree of the raw material inside the outer cylinder 2 and avoid air holes in the silicone sleeve, such as Figure 10 and Figure 11 As shown, based on the previous embodiment, in this embodiment, the round rod 3 is rotatably mounted on the connecting plate 1. An anti-slip groove 301 is formed on the circumferential surface of the round rod 3 near the connecting plate 1 to increase the friction between the surface of the round rod 3 and the raw material. During operation, the round rod 3 reciprocates, causing the raw material adhering to its surface to move circumferentially, thereby pushing the raw material to the areas on both sides, ensuring that the raw material fully fills the space inside the outer cylinder 2. A rotating block 8 located inside the connecting plate 1 is fixedly mounted on the end face of the round rod 3. A pull wire 9 is wound around the moving block 8, with one end of the pull wire 9 fixedly connected to the rotating block 8 and the other end of the pull wire 9 extending to the outside of the connecting plate 1; the rotating block 8 and the connecting plate 1 are connected by a torsion spring 10; by pulling the pull wire 9 with external force, the rotating block 8 and the round rod 3 can be driven to rotate in the forward direction, and the torsion spring 10 will deform and store energy; after the external force on the pull wire 9 is released, the torsion spring 10 returns to its original state and drives the rotating block 8 and the round rod 3 to rotate in the reverse direction; in this way, only intermittent pulling of the pull wire 9 is needed to drive the round rod 3 to rotate back and forth.

[0061] like Figure 12 As shown, a synchronizing rod 11 is fixedly installed on the slider 503 near the connecting plate 1 in the piercing assembly 5, and the other end of the pull wire 9 is fixedly connected to the corresponding synchronizing rod 11. During the reciprocating motion of the slider 503, the pull wire 9 is pulled intermittently. That is, when the slider 503 moves away from the outer cylinder 2, a pulling force is applied to the pull wire 9, and when the slider 503 moves towards the outer cylinder 2, the pulling force on the pull wire 9 is released. Thus, in this embodiment, it is only necessary to apply a force to the drive gear ring 6 to make the drive gear ring 6 rotate at a stable speed, so that each piercing assembly 5 can work synchronously to pierce the silicone sleeve, and each blade 4 can also saw the silicone sleeve synchronously. At the same time, it can also drive each round rod 3 to reciprocate, so that the raw material can fully fill the space inside the outer cylinder 2.

[0062] Example 5

[0063] Based on the previous embodiment, in this embodiment, a powder blowing assembly is installed on the outer cylinder 2 corresponding to the position of each blade 4. The powder blowing assembly is used to blow talcum powder to the surface of the blade 4. During the cutting process of the silicone sleeve, the blade 4 applies some talcum powder to the cut, so as to prevent the silicone at the cut from re-adhere to the blade 4 after separation.

[0064] Specifically, such as Figure 14 and Figure 15 As shown, the powder blowing assembly includes a first air pipe 13 fixedly installed on the end face of the outer cylinder 2 and facing the cutting edge of the blade 4. A storage cavity 14 communicating with the first air pipe 13 is fixedly installed on the outer cylinder 2. A second air pipe 15 communicating with the storage cavity 14 is also fixedly installed on the outer cylinder 2. The second air pipe 15 communicates with an external flexible conveying pipe, which is filled with talc powder. A first sealing piece 16 for sealing the first air pipe 13 and a second sealing piece for sealing the second air pipe 15 are slidably installed in the storage cavity 14. The first sealing plate 16 and the second sealing plate 17 are fixedly connected by a U-shaped connecting frame 18; a magnet block 19 is slidably installed on the connecting frame 18 and passes through the connecting frame 18; an adjusting plate 20 extending into the storage cavity 14 is fixedly installed on the rigid rod 7, the adjusting plate 20 is provided with a guide groove 21 that slides with the magnet block 19, and a piston plate 22 that cooperates with the storage cavity 14 is also fixedly installed on the adjusting plate 20, the storage cavity 14 is provided with a vent hole to facilitate the smooth movement of the piston plate 22.

[0065] During operation, the rigid rod 7 reciprocates, causing the adjusting plate 20 to extend and retract within the storage cavity 14, and simultaneously causing the piston plate 22 to reciprocate within the storage cavity 14; Figure 15 In this state, the second sealing plate 17 is not in contact with the second air tube 15, the second air tube 15 is connected to the storage cavity 14, the first sealing plate 16 is in contact with the first air tube 13, the first air tube 13 is not connected to the storage cavity 14; the storage cavity 14 stores talcum powder drawn from the second air tube 15; next, the rigid rod 7 drives the adjusting plate 20 and the piston plate 22 to move downwards. Figure 15(In the direction of downward movement), the guide groove 21 guides the magnet block 19, causing the magnet block 19, connecting frame 18, first sealing plate 16 and second sealing plate 17 to move synchronously to the right until the second sealing plate 17 contacts the second air pipe 15. The second air pipe 15 is not connected to the storage cavity 14. At this time, the first sealing plate 16 is not in contact with the first air pipe 13, and the first air pipe 13 is connected to the storage cavity 14. As the piston plate 22 moves downward with the adjusting plate 20, it squeezes the air containing talc in the storage cavity 14. The talc enters the first air pipe 13 under the action of air pressure (the second air pipe 15 is blocked, and the talc cannot enter), and is finally blown out from the outlet of the first air pipe 13. The blown talc contacts the blade 4 and adheres to the surface of the blade 4. As the blade 4 cuts the silicone sleeve, some talc is transferred to the cut of the silicone sleeve, avoiding the silicone adhesion at the cut.

[0066] It should be noted that in this embodiment, the guide groove 21 is a parallelogram, and the bottom of the guide groove 21 is made of iron, so that the magnet 19 is always attracted to the bottom of the guide groove 21; Figure 15 The guide groove 21 includes a first vertical section on the left and a second vertical section on the right, as well as a first inclined section above and a second inclined section below. There is a step at the connection between the top of the second vertical section and the right side of the first inclined section, meaning there is a sudden change in groove depth. Therefore, the magnet 19 cannot directly return to the second vertical section after entering the first inclined section from the second vertical section. In other words, when the adjusting plate 20 moves upwards from the bottom, the magnet 19 can only enter the first inclined section and then the first vertical section. There is also a step at the connection between the bottom of the first vertical section and the left end of the second inclined section, meaning there is a sudden change in groove depth. Therefore, the magnet 19 cannot directly return to the first vertical section after entering the second inclined section from the first vertical section. Figure 15 In this state, as the adjusting plate 20 moves downward, the magnet 19 can only move upward along the second inclined section and then enter the second vertical section. Thus, as the adjusting plate 20 moves up and down repeatedly, the magnet 19, the connecting frame 18, the first sealing plate 16 and the second sealing plate 17 also move horizontally left and right in a synchronized and regular manner, thereby cooperating with the piston plate 22 to periodically draw talcum powder from the second air pipe 15 and blow the talcum powder into the first air pipe 13.

[0067] In summary, this embodiment achieves the effect of periodically drawing talcum powder from the second air tube 15 and blowing the talcum powder to the blade 4 without adding an additional power source.

[0068] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A method for preparing a nano-scale high-temperature resistant ceramicized silicone sleeve, comprising the following steps: Step 1: Mix silicone, ceramic powder, flame retardant powder, structure control agent and vulcanizing agent evenly to obtain ceramicized silicone raw material; Step 2: Extrude the ceramicized silicone raw material using an extruder to obtain a molded ceramicized silicone sleeve; Step 3: Place the formed ceramicized silicone sleeve into a hot air vulcanizing furnace for vulcanization; Step two is completed using a nano-level high-temperature resistant ceramicized silicone sleeve preparation equipment, including a connecting plate (1) installed at the outlet of the extruder. The surface of the connecting plate (1) is equipped with an outer cylinder (2) and several round rods (3) located inside the outer cylinder (2). The axes of the outer cylinder (2) and the round rods (3) are parallel to each other and perpendicular to the connecting plate (1). The outer cylinder (2) is equipped with blades (4) for cutting the ceramicized silicone sleeve. The number of blades (4) is the same as the number of round rods (3) and their positions correspond one-to-one. The outer cylinder (2) is equipped with clamping blocks (12) in the same number as the blades (4). The blades (4) are fixedly installed on the corresponding clamping blocks (12). The clamping blocks (12) slide in a radial direction with the end face of the outer cylinder (2). The outer cylinder (2) is equipped with a piercing assembly (5) for piercing the ceramicized silicone sleeve at the position corresponding to each blade (4). The piercing assembly (5) includes a piercing needle (501) that slides through the outer cylinder (2) radially. There are two piercing needles (501), and the positions of the two piercing needles (501) are arranged along the axial direction of the outer cylinder (2). A limit frame (502) is fixedly installed on the outer cylinder (2). Two sliders (503) are slidably installed on the limit frame (502) radially. The two piercing needles (501) are fixedly installed on the two sliders (503) respectively. The limiting frame (502) is equipped with a rotating shaft (504), and a first connecting rod (505) is fixedly installed at both ends of the rotating shaft (504). A second connecting rod (506) is rotatably installed at the end of the slider (503) away from the outer cylinder (2), and the second connecting rod (506) is hinged to the corresponding first connecting rod (505).

2. The method for preparing a nanoscale high-temperature resistant ceramicized silicone sleeve according to claim 1, characterized in that, A driven gear (507) is fixedly sleeved on the rotating shaft (504); a drive gear ring (6) coaxial with it is rotatably mounted on the outer cylinder (2) via a bracket, and the drive gear ring (6) meshes with each driven gear (507).

3. The method for preparing a nanoscale high-temperature resistant ceramicized silicone sleeve according to claim 2, characterized in that, A rigid rod (7) is fixedly installed on the slider (503) near the corresponding clamping block (12) in the piercing assembly (5), and the rigid rod (7) is fixedly connected to the corresponding clamping block (12).

4. The method for preparing a nanoscale high-temperature resistant ceramicized silicone sleeve according to claim 3, characterized in that, The round rod (3) is rotatably mounted on the connecting plate (1), and an anti-slip groove (301) is provided on the circumferential surface of the round rod (3).

5. The method for preparing a nanoscale high-temperature resistant ceramicized silicone sleeve according to claim 4, characterized in that, A rotating block (8) located inside the connecting plate (1) is fixedly installed on the end face of the round rod (3). A pull wire (9) is wound on the rotating block (8), and one end of the pull wire (9) is fixedly connected to the rotating block (8), while the other end of the pull wire (9) extends to the outside of the connecting plate (1). The rotating block (8) and the connecting plate (1) are connected by a torsion spring (10).

6. The method for preparing a nanoscale high-temperature resistant ceramicized silicone sleeve according to claim 5, characterized in that, A synchronizing rod (11) is fixedly installed on the slider (503) near the connecting plate (1) in the piercing assembly (5), and the other end of the pull wire (9) is fixedly connected to the corresponding synchronizing rod (11).

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