Vulcanization molding process of fabric-reinforced rubber hose

Abstract

The application discloses a pipe blank vulcanization mold for a fabric-reinforced rubber pipe, which comprises a mold core mainly composed of a mold core frame, a plurality of sleeve joints arranged at intervals and connected to the two sides of the mold core frame, and inner core rods for penetrating the pipe blank and connected to the end of the sleeve joints; a lower mold for supporting the mold core, the upper end surface of the lower mold being formed with a lower mold cavity; and an upper mold for pressing the mold core, the lower end surface of the upper mold being formed with an upper mold cavity; the upper mold cavity and the lower mold cavity can be matched with each other to form a mold core cavity, and the mold core can be pressed between the lower mold and the upper mold and enclosed in the mold core cavity. The application also discloses a pipe blank vulcanization equipment and process for the fabric-reinforced rubber pipe. The pipe blank after vulcanization has high dimensional accuracy, the consistency of the pipe blank after vulcanization is ensured, the qualified rate of the finished product is improved, and the processing efficiency of the fabric-reinforced rubber pipe is improved.

Description

Technical Field

[0001] The present invention relates to a vulcanization molding process for a fabric-reinforced rubber hose, belonging to the technical field of rubber hose processing. Specifically, the present invention relates to a vulcanization mold for a fabric-reinforced rubber hose blank. Furthermore, the present invention also provides a vulcanization apparatus and process for a fabric-reinforced rubber hose blank based on the vulcanization mold. Background Art

[0002] Rubber hoses are commonly used rubber products in daily life and industry. They are mainly used to wrap internal parts or convey media. Rubber hoses generally need to be vulcanized through a vulcanization process to obtain higher elasticity, heat resistance, tensile strength and insolubility in organic solvents.

[0003] Some rubber hoses are often exposed to high temperatures and pressures due to the influence of their materials and application environment. For example, fluororubber and silicone rubber are often used in connecting hoses for engine oil coolers, turbochargers, differential pressure sensors, etc. The operating temperature is generally 180℃-220℃, and they are exposed to 200℃ for a long time. The working pressure is 0.3MPa and the bursting pressure is above 1MPa. Therefore, such rubber hose products need to be processed with a fabric (aramid yarn) reinforcement layer before vulcanization to increase high temperature resistance and pressure resistance to form a fabric-reinforced rubber hose.

[0004] Fabric-reinforced rubber hoses are specialized hoses that often present the following challenges during vulcanization: 1. The hoses' large diameter expansion is essentially impossible with existing conventional core-sleeving equipment, requiring specialized equipment. However, current equipment is expensive and expensive. 2. For some soft curved hoses with bends, the inner and outer R wall thicknesses are severely uneven due to the product's small center R and the large difference in inner and outer arc lengths. 3. Standard vulcanization processes struggle to meet the strict requirements for appearance and consistency in terms of wall thickness, tolerance, and curvature after expansion. 4. Existing vulcanization processes typically utilize pressures below 0.55 MPa and temperatures below 160°C, resulting in processing times exceeding 2 hours and long vulcanization times. These issues contribute to a high rate of finished product rejection for fabric-reinforced rubber hoses, poor product consistency, high costs, and low efficiency. Summary of the Invention

[0005] Based on the above technical problems, the present invention provides a fabric-reinforced rubber tube blank vulcanization mold, thereby solving the technical problems of the existing rubber tube blanks being time-consuming, costly and having poor product consistency during vulcanization.

[0006] In order to solve the above technical problems, the specific technical solutions adopted by the present invention are as follows:

[0007] A tube blank vulcanization mold for a fabric-reinforced rubber tube, comprising:

[0008] The mold core is mainly composed of a mold core frame, and a plurality of sleeve joints are connected to both sides of the mold core frame. The ends of the plurality of sleeve joints are connected to an inner core rod for passing the tube blank;

[0009] The lower mold is used to support the mold core, and the upper end surface of the lower mold is formed with a lower mold cavity;

[0010] The upper mold is used to press the mold core, and the lower end surface of the upper mold is formed with an upper mold cavity;

[0011] The upper mold cavity and the lower mold cavity can be paired with each other to form a core mold cavity, and the core mold can be pressed between the lower mold and the upper mold and enclosed in the core mold cavity.

[0012] Preferably, the socket joints on both sides are symmetrical and staggered with each other.

[0013] Preferably, both ends of the core frame are connected with fixed blocks extending out of the core cavity, both ends of the core frame are provided with core positioning holes between the fixed blocks, and the lower mold cavity is further provided with core positioning columns plugged into the core positioning holes.

[0014] Preferably, both ends of the core frame are further provided with through holes.

[0015] Preferably, the inner core rod has a serpentine bending structure, mainly consisting of a straight pipe portion connected to the sleeve joint, an elbow portion integrally formed with the straight pipe portion, and a lower bending portion integrally formed with the elbow portion.

[0016] Preferably, concave cavities are symmetrically provided on both sides of the upper end surface of the lower mold, and protrusions cooperating with the concave cavities are symmetrically provided on both sides of the lower end surface of the upper mold. The bottom surface of the concave cavity and the surface of the protrusion are both inclined surfaces, and the lower mold cavity or the upper mold cavity extends into the concave cavity or the protrusion along the inclined surface.

[0017] Preferably, vertical through holes penetrating the lower mold are symmetrically arranged in the cavity.

[0018] Preferably, the upper end surface of the lower mold is provided with a mold positioning hole, and the lower end surface of the upper mold is provided with a mold positioning column plugged into the positioning hole.

[0019] Preferably, the mold positioning holes are evenly arranged in multiple numbers and are located at the edge of the upper end surface of the lower mold, and the mold positioning holes are all blind holes.

[0020] Preferably, the lower end of the lower mold is also movably connected to a bottom plate, and a plurality of positioning openings are provided on opposite sides of the bottom plate.

[0021] Preferably, adjustment notches are symmetrically provided on both sides of the upper end of the lower mold.

[0022] Based on the above tube blank vulcanization mold, the beneficial effects of the present invention are as follows: the present invention controls the inner diameter of the tube blank through the mold core, and controls the outer diameter of the tube blank through the upper mold and the lower mold, so that the rubber tube made from the tube blank after vulcanization has very high dimensional accuracy, and the inner and outer diameters of the rubber tube are basically consistent, which ensures the consistency of the tube blank after vulcanization, and the yield of the fabric-reinforced rubber tube is also improved. Moreover, through the mold core design, the vulcanization pressure between the upper mold and the lower mold can reach 20MPa, and the temperature can reach 180℃~190℃, so that the vulcanization time can be shortened to 6min~10min, thereby reducing the preparation time of the fabric-reinforced rubber tube and improving the processing efficiency of the fabric-reinforced rubber tube.

[0023] At the same time, based on the above fabric-reinforced rubber tube blank vulcanization mold, the present invention also discloses a fabric-reinforced rubber tube blank vulcanization equipment. Specifically, the equipment includes a tube blank vulcanization equipment body, the tube blank vulcanization equipment body is provided with a clamping platform and a pressurized heating lifting platform, and also includes the above-mentioned tube blank vulcanization mold;

[0024] The upper mold is fixed on a pressurized and heated lifting platform, the lower mold is clamped on a fixture platform, and the mold core is pressed between the lower mold and the upper mold.

[0025] Based on this, the clamp platform is also provided with a clamp that clamps on both sides of the lower mold. The clamp includes a positioning plate, and at least two clamping notches are provided on one side of the positioning plate. The upper end of the clamp is also symmetrically provided with a positioning block, and a tightening bolt is threadedly connected to the positioning block.

[0026] The tube blank vulcanization equipment described above can be well matched with the tube blank vulcanization mold. It has all the characteristics brought by the mold, and the mold is easy to load and unload. It can ensure the temperature and pressure required by the mold. It has the characteristics of high vulcanization efficiency, precision and finished product qualification rate of fabric reinforced rubber tubes.

[0027] Finally, based on the above-mentioned tube blank vulcanization mold and / or tube blank vulcanization equipment, the present invention also discloses a tube blank vulcanization process for a fabric-reinforced rubber tube, comprising the following steps:

[0028] S1 uses rubber extrusion equipment to prepare tube blanks with fabric reinforcement layers;

[0029] The port at one end of the S2 tube is expanded, and the inner wall of the tube is sprayed with a release agent twice, with the tail end of the tube blocked during spraying;

[0030] S3. Wipe the inner core rod of the mold core with silicone oil, and insert the tube blank onto the mold core with the expanded end as the starting end. After insertion, the starting end should be 5mm away from the sleeve joint, and the other end of the tube blank should be less than 3mm away from the end of the inner core rod.

[0031] After the S4 core is inserted into the tube, it is placed in the lower die cavity. The upper die is pressed down and matched with the lower die. The pressure is continuously increased until the upper and lower dies are locked. The locking pressure is 20 MPa.

[0032] After S5 mold clamping, the temperature is raised to 180℃~190℃ for vulcanization, and the vulcanization time is 6min~10min;

[0033] S6 After the vulcanization is completed, the mold is opened, the lower mold and the mold core are removed, and the vulcanized tube blank is removed;

[0034] S7: Immerse the mold core in water for cooling. The immersion time is at least 20 seconds. After immersion, the temperature of the mold core is below 40°C. After immersion, wipe off the water stains.

[0035] S8 cleans the lower mold, reassembles the lower mold and the mold core, and repeats steps S3-S7.

[0036] The tube blank vulcanization process of the present invention can quickly and efficiently vulcanize the tube blank to prepare a fabric-reinforced rubber tube. The process is simple and efficient. The prepared fabric-reinforced rubber tube has high dimensional accuracy and product consistency, and is particularly suitable for preparing a fabric-reinforced rubber tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 1 is a schematic diagram of the first structure of the tube blank vulcanization mold of the present invention, in which the mold is in the closed state;

[0038] Figure 2 2 is a schematic diagram of the second structure of the tube blank vulcanization mold of the present invention, wherein the upper mold is omitted;

[0039] Figure 3 A top view of the lower mold of the present invention;

[0040] Figure 4 It is a side view of the lower mold of the present invention;

[0041] Figure 5 It is a bottom view of the upper mold of the present invention;

[0042] Figure 6 It is a side view of the upper mold of the present invention;

[0043] Figure 7 It is a front view of the mold core of the present invention;

[0044] Figure 8 It is a side view of the mold core of the present invention;

[0045] Figure 9 1 is a schematic diagram of the first structure of the tube blank vulcanization equipment of the present invention, wherein the tube blank vulcanization mold is in an open mold state, and the mold core is omitted in the figure;

[0046] Figure 102 is a second structural schematic diagram of the tube blank vulcanization equipment of the present invention, wherein the tube blank vulcanization mold is in a closed mold state;

[0047] Figure 11 It is a schematic diagram of the matching structure of the lower die and the clamp of the present invention;

[0048] The marks in the figure are respectively represented as: 1. lower mold; 2. upper mold; 3. mold core; 4. vertical through hole; 5. lower mold cavity; 6. adjustment notch; 7. bottom plate; 8. positioning port; 9. mold core positioning column; 10. mold positioning hole; 11. concave cavity; 12. upper mold cavity; 13. mold positioning column; 14. protrusion; 15. fixing block; 16. mold core positioning hole; 17. mold core frame; 18. inner core rod; 19. sleeve joint; 20. through hole; 21. tube blank vulcanizing equipment body; 22. pressurized heating lifting platform; 23. clamping platform; 24. positioning block; 25. tightening bolt; 26. positioning plate; 27. clamping notch. DETAILED DESCRIPTION

[0049] 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 described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0050] In the description of the present invention, it should be understood that the terms "one end", "the other end", "both ends", "between", "middle", "lower", "upper end", "lower end", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 invention.

[0051] In the description of the present invention, it should be noted that, unless otherwise specified or limited, the terms "disposed" and "connected" should be understood broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to direct connections or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0052] like Figure 1-11 As shown, the present invention first discloses a tube blank vulcanization mold for a fabric-reinforced rubber tube, which is mainly used for preparing the fabric-reinforced rubber tube, and at least includes:

[0053] The mold core 3 is mainly composed of a mold core frame 17. The mold core frame 17 can be set to a plate shape, a column shape, a long strip shape, etc. to make it better positioned. The mold core frame 17 is connected to a number of sleeve joints 19 on both sides symmetrically along its length. The sleeve joints 19 can be set to a plate shape, a column shape, a long strip shape, etc., which are mainly used to limit the end of the tube blank and position the mold core frame 17. The sleeve joints 19 are preferably arranged at intervals to meet the working space and molding conditions of each sleeve joint 19 to ensure that the sleeve joints 19 are not affected by each other. The sleeve joints 19 can be integrally formed with the mold core frame 17 in an integrated structure, such as mold casting, welding and polishing. If necessary, the ends of the sleeve joints 19 are It is connected with an inner core rod 18, which is a columnar structure and can be set into a rod shape, a curved tube shape, an irregular curved tube shape and other structures as needed. It is mainly used to pair with the tube blank and to sleeve the tube blank. Its surface is preferably set to a smooth structure or electroplated with a smooth layer to increase the smoothness to facilitate loading and unloading of the tube blank. The inner core rod 18 can also be formed as an integral structure with the sleeve joint 19; as is known, the above core frame 17, sleeve joint 19, and inner core rod 18 should all be made of high temperature and high pressure resistant metal (such as carbon steel, nickel steel, nickel-chromium alloy steel, high strength stainless steel, etc.) to meet the molding requirements. The specific material selection can be selected according to specific needs. Since it belongs to the existing technology, it will not be repeated here.

[0054] The lower mold 1 is used to support the above-mentioned mold core 3. It is generally located at the lower end of the mold core 3. The shape can be round, square, polygonal, etc. The material used can be the same as that of the mold core 3. As a necessary structure, the upper end surface of the lower mold 1 is the pressure-bearing surface, which is used to support the mold core 3 and withstand pressure. Therefore, a lower mold cavity 5 is provided on the pressure-bearing surface to position the mold core.

[0055] The upper mold 2 is used to press the core mold 3. It is generally located at the upper end of the core mold 3. The shape can be round, square, polygonal, etc. The material used can be the same as that of the core mold 3. As a necessary structure, the lower end surface of the upper mold 2 is the pressure surface, and the pressure surface is used to apply pressure to the core mold 3 and the lower mold 1. Therefore, an upper mold cavity 12 is formed on the pressure surface to position the core mold 3.

[0056] It should be noted that the above-mentioned upper mold cavity 12 and lower mold cavity 5 are paired structures. The two can be paired with each other to form a core mold cavity. The overall structure, shape and size of the core mold cavity are consistent with the core mold 3 after the tube blank is sleeved. The core mold 3 can be pressed between the lower mold 1 and the upper mold 2 and enclosed in the core mold cavity, thereby forming a complete vulcanization mold structure.

[0057] In specific use, the tube blank of the present invention is cleaned and lubricated and then sleeved with the fabric-reinforced tube blank. After the sleeve is completed, the entire mold core 3 is placed in the lower mold cavity 5 of the lower mold 1 and positioned. Then, the upper mold 2 is pressed against the upper mold 2 and paired to ensure that the mold core cavity presses and seals the mold core 3. Then, the upper mold 2 is pressurized and heated. After the upper mold 2 and the lower mold 1 are pressed and closed, the mold vulcanization can be carried out. After the vulcanization is completed, the upper mold 2 and the lower mold 1 are separated from the mold, the mold core 3 is removed, and the vulcanized tube blank is separated from the inner core rod 18. The removed vulcanized tube blank is then polished, cut, plated, etc. to obtain a fabric-reinforced rubber tube. The present invention utilizes the mold core 3 to sleeve a plurality of tube blanks for simultaneous tube vulcanization. The inner diameter of the tube blank can be controlled by the inner core rod 18, and the outer diameter of the tube blank can be controlled by the mold core cavity. The dimensions of the plurality of tube blanks can be kept consistent. The vulcanized finished product has high consistency, and the vulcanization time can be greatly shortened, thereby improving the vulcanization efficiency.

[0058] In order to further improve the vulcanization effect, the sleeve joints 19 on both sides are symmetrical and staggered with each other. Combined with the above structure, the sleeve joints 19 on both sides are spaced from each other, and the sleeve joints 19 on both sides are relatively symmetrical, and are staggered with each other along the length direction of the core frame 17, thereby maximizing the utilization of the core cavity space. There is a large interval and space between each inner core rod 18, which can ensure that the mutual vulcanization environment (vulcanization temperature, pressure, etc.) is not affected and basically maintains a consistent vulcanization environment.

[0059] As the main structure of the mold core 3, both ends of the mold core frame 17 are connected with fixed blocks 15 extending out of the mold core cavity. The fixed blocks 15 can be integrally formed with the mold core frame 17, and their shapes can be square, cylindrical, polygonal, etc. They are mainly used to position the mold core frame 17 at the position of the upper mold 2 or the lower mold 1, and they can also be used as a handheld portion to facilitate the handheld loading and unloading of the mold core frame 17, and can also be used as two heat-conducting ends to contact with the external heating component to transfer heat to the mold core 3 for rapid heating, and the two ends of the mold core frame 17 are located A core positioning hole 16 is also provided between the two fixed blocks 15. The core positioning hole 16 can be a through hole or a blind hole with any cross-sectional shape. It is best to be vertically arranged in the vertical direction of the core frame 17. Correspondingly, the lower mold 1 is also provided with a core positioning column 9 in its lower mold cavity 5, which is paired with the core positioning hole 16. When the core frame 17 is paired with the lower mold 1, the core positioning column 9 is plugged into the core positioning hole 16, and the core frame 17 can be accurately positioned in the lower mold cavity 5 to reduce assembly errors.

[0060] In some embodiments, through holes 20 are provided at both ends of the core frame 17. These through holes 20 are symmetrically arranged vertically on the core frame 17. These through holes 20 are used to accommodate and install elastic objects, such as springs or elastic sheets, to prevent the tube blank from adhering to the upper mold during mold opening and being damaged during demolding. After the springs or elastic sheets are installed in the through holes 20, a reaction force is generated during mold opening, causing the tube blank to fall into the lower mold cavity due to the reaction force during mold opening, facilitating mold opening and effectively protecting the tube blank. In some embodiments, the through holes 20 can be through holes that penetrate the core frame 17 or blind holes that do not penetrate the core frame 17. Their shapes can be designed based on the outer shape of the elastic object, such as circular or polygonal.

[0061] The inner core rod 18 serves as a socket piece paired with the tube blank. In the present invention, its specific structure is serpentine-shaped and bent as a whole to form a bent tube structure with multiple angles. It mainly consists of a straight tube portion connected to the socket joint 19, an elbow portion integrally formed with the straight tube portion, and a lower bending portion integrally formed with the elbow portion. After the tube blank is vulcanized and removed, a rubber tube with continuous curvature, radian, multiple angles, etc. can be formed without the need for subsequent bending processing.

[0062] During vulcanization, the core cavity is composed of a pair of upper cavity 12 and lower cavity 5. Therefore, in order to ensure that the core cavity and the core 3 of the tube blank are accurate and consistent in appearance, and to avoid problems such as uneven tube wall and irregular outer circle of the tube blank after vulcanization due to inaccurate pairing, and to ensure the vulcanization effect, the present invention is symmetrically provided with concave cavities 11 on both sides of the upper end face of the lower mold 1, and symmetrically provided with protrusions 14 that cooperate with the concave cavity 11 on both sides of the lower end face of the upper mold 2. When the two are paired, the two protrusions 14 and the concave cavity 11 are paired with each other, so that they can serve as a paired positioning structure to accurately position and align the upper mold 2 and the lower mold 1, thereby achieving precise assembly. In some schemes, the bottom surface of the cavity 11 and the surface of the protrusion 14 can be set as an inclined surface or a partially inclined surface to increase the positioning accuracy, and the lower mold cavity 5 or the upper mold cavity 12 can extend into the above-mentioned cavity 11 or the protrusion 14 along the inclined surface. The inclined surface can be used to control the direction or depth of the lower mold cavity 5 or the upper mold cavity 12, and then a rubber tube with continuous curvature, radian, multiple bends, etc. as described in the above part can be prepared, which not only has a good positioning and guiding effect, but also can adapt to the structure of the rubber tube.

[0063] Furthermore, vertical through holes 4 penetrating the lower mold 1 are symmetrically provided in the concave cavity 11. The vertical through holes 4 can be used as vent holes to vent the air in the core cavity during the pressing process of the upper mold 2, which is convenient for mold closing. When the upper mold 2 is pressed, it is closed by the lower end face of the upper mold 2 to ensure the sealing of the mold after mold closing. When the mold needs to be opened, since there is no air inside the upper mold 2 and the lower mold 1 and it is a negative pressure, a larger pulling force is required to open the mold. Using a larger pulling force to open the mold may tear the internal tube blank. At this time, the vertical through hole 4 can be used as an air inlet hole for air intake in the core cavity, thereby connecting the core cavity with the external space. The mold can be opened with a smaller pressure, which greatly protects the tube blank inside the core cavity and facilitates the mold opening and closing operations. In some embodiments, each cavity 11 has at least two symmetrical vertical through holes 4 for uniform air intake or exhaust, and the vertical through holes 4 are preferably arranged at the edge of the cavity 11 or at the lowest end of the inclined surface in some embodiments for smoother ventilation, further reducing the difficulty of opening and closing the mold.

[0064] At the same time, during vulcanization, the precise matching of the upper mold 2 and the lower mold 1 determines the molding effect of the core cavity. While ensuring the perfect matching of the core cavity, a mold positioning hole 10 can be set on the upper end face of the lower mold 1, and a mold positioning column 13 that is plugged into the mold positioning hole 10 is set on the lower end face of the upper mold 2. When the mold is closed, the mold positioning column 13 is first preliminarily positioned and aligned with the mold positioning hole 10 to ensure that the upper mold 2 and the lower mold 1 are basically aligned, and then the above-mentioned cavity 11 and the protrusion 14 can be combined for secondary positioning to achieve precise matching of the upper mold 2 and the lower mold 1. In some schemes, multiple mold positioning holes 10 can be evenly arranged and located at the edge of the upper end face of the lower mold 1, and the mold positioning holes 10 are all blind holes, so that they can be positioned while ensuring that the end faces of the upper mold 2 and the lower mold 1 are horizontally fitted and sealed after pairing. The blind holes can also serve as limiting holes to ensure the extrusion depth of the upper mold 2, and a pressure sensor or displacement sensor can be set at the bottom of the blind hole to detect the depth of the mold positioning column 13 or apply pressure, thereby further controlling the clamping pressure and depth of the upper mold 2.

[0065] When the tube blank vulcanization mold of the present invention is in use, the lower mold 1 generally needs to be fixedly positioned on a corresponding operating position, such as a fixed platform, operating table, or equipment workbench. Therefore, to facilitate the fixation of the lower mold 1, the present invention further includes a base plate 7 movably connected to the lower end of the lower mold 1. The base plate 7 is provided with a plurality of positioning openings 8 on opposite sides of the base plate 7. The base plate 7 assists in the mating of the lower mold 1 with the corresponding operating position. The positioning openings 8 on the base plate 7 can also be used to mate with corresponding bolts, buckles, and other structures to strengthen the fixation, thereby better achieving convenient connection and assembly and disassembly of the lower mold 1 with the corresponding operating position.

[0066] At the same time, adjustment notches 6 can be symmetrically provided on both sides of the upper end of the lower die 1. The adjustment notches 6 can be paired with the positioning opening 8 or, when the positioning opening 8 cannot be fixed, with a positioning piece or a clamp provided at the corresponding operating position to form a positioning and clamping mechanism, so as to facilitate the fixing of the lower die 1 or adjustment of the corresponding direction. The adjustment notches 6 are preferably provided at the edges of both sides of the upper end of the lower die 1, and two adjustment notches 6 are preferably provided on both sides at intervals to evenly clamp the lower die 1. The adjustment notches 6 are preferably provided as a semi-open notch structure with the upper end and / or the outer side open, so as to better match with the positioning piece or clamp.

[0067] The above is the technical solution of the tube blank vulcanization mold of the present invention. On the basis of the above content, the present invention also discloses a tube blank vulcanization equipment for a fabric-reinforced rubber tube, including a tube blank vulcanization equipment main body 21. The tube blank vulcanization equipment main body 21 can be a rubber injection press, a flat vulcanizer, a continuous vulcanizer, etc. Specifically, a (200T pressure) Qianpu brand rubber injection press can be used. As an existing structure, the tube blank vulcanization equipment main body 21 is provided with at least one clamping platform 23 (processing platform) for clamping a workpiece or a mold, and a pressurized heating lifting platform 22 for pressurizing and heating the workpiece or the mold; and different from the existing structure, The tube blank vulcanization equipment of the present invention also includes a tube blank vulcanization mold, which serves as the core of the tube blank vulcanization equipment. The tube blank vulcanization mold is the tube blank vulcanization mold described in the above embodiment, wherein the upper mold 2 of the tube blank vulcanization mold is fixed to the lower end surface of the pressurized and heated lifting platform 22, which can be raised and lowered with it and can transfer the heat of the pressurized and heated lifting platform 22, while the lower mold 1 is clamped on the upper end surface of the clamping platform 23 and remains fixed, and the mold core 3 is pressed between the lower mold 1 and the upper mold 2, so that the upper mold 2 can be driven to press the mold core 3 by raising and lowering the pressurized and heated lifting platform 22, and the heat is transferred to the mold core 3 through the upper mold 2 to vulcanize the tube blank on the mold core 3.

[0068] The tube blank vulcanization equipment of the present invention can realize fast and efficient tube blank vulcanization by cooperating with the tube blank vulcanization mold, with high vulcanization efficiency. The vulcanization pressure between the upper mold 2 and the lower mold 1 can reach 20 MPa, and the temperature can reach 180° C. to 190° C., thereby shortening the vulcanization time to 6 min to 10 min, thereby reducing the preparation time of the fabric-reinforced rubber tube and improving the processing efficiency of the fabric-reinforced rubber tube.

[0069] For better implementation, the present invention also discloses a clamping structure of a tube blank vulcanization mold and a clamping platform 23, specifically: a clamp is also provided on the clamping platform 23 for clamping on both sides of the lower mold 1, and the clamp includes a positioning plate 26, and at least two clamping notches 27 are provided on one side of the positioning plate 26. A positioning block 24 is also symmetrically provided on the upper end of the positioning plate 26, and a tightening bolt 25 is threadedly connected to the positioning block 24. The positioning plate 26 can be placed directly on the clamping platform 23, and the positioning plate 26 can be fixed to the clamping platform 23 by bolts, clamps, etc. that pass through the clamping notch 27. For example, a trapezoidal slide can be provided on the clamping platform 23, and the head of the bolt is provided in the trapezoidal slide and slides into the clamping notch 27 and then locked by a nut. A retractable telescopic structure (hydraulic cylinder, pneumatic cylinder, electric push rod, etc.) can also be provided on the clamping platform 23, and a tightening column, a tightening block and other tightening parts can be provided at the telescopic end. The tightening part presses against the clamping notch 27 to tighten the positioning plate 26, and then cooperates with the bottom plate 7 and the positioning port 8 in the above-mentioned scheme to achieve multi-directional fixed clamping, with good clamping effect, and the tightening bolt 25 can be rotated so that the end thereof presses against the side surface of the lower mold 1 or presses against the above-mentioned adjustment notch 6, thereby fixing the lower mold 1 in combination with the above structure, and the position of the lower mold 1 between the tightening bolts 25 on both sides can also be adjusted by the tightening bolt 25, and then the lower mold 1 can be laterally displaced to adjust the position.

[0070] Finally, the present invention also discloses a tube blank vulcanization process for a fabric-reinforced rubber tube, comprising the following steps:

[0071] S1 uses rubber extrusion equipment to prepare tube blanks with fabric reinforcement layers;

[0072] In this step, the rubber extrusion equipment can be an extruder, a knitting machine or a traction machine, etc. The inner and outer diameters of the tube blank can be adjusted as needed, and the extruded tube blank is completely cooled to room temperature.

[0073] The port at one end of the S2 tube is expanded, and the inner wall of the tube is sprayed with a release agent twice, with the tail end of the tube blocked during spraying;

[0074] In this step, the diameter expansion can prevent the inner ring of the tube blank port and the leakage of the wire end in the port. The diameter expansion tool can be used to expand the diameter. The diameter after expansion is 1.1-1.2 times the diameter of the core. After expansion, a small amount of release agent is evenly sprayed on the inner wall of the tube blank. The release agent can be a liquid release agent such as glycerol, silicone oil, polyethylene glycol, etc. The effective ingredient sprayed per square meter is 30g-50g. The spraying can be sprayed from the head end of the tube blank to the inner wall. It is best to spray twice. After the first spraying, wait for it to dry completely and then spray for the second time. During the two sprayings, the tail end of the tube blank, that is, the end opposite to the head end, is blocked so that the release agent can be completely attached to the inner wall of the tube blank to avoid volatilization, and the release agent can be evenly diffused on the inner wall of the tube blank to achieve uniform spraying.

[0075] S3: Wipe the inner core rod 18 (lower bend) of the core 3 with silicone oil, and thread the tube onto the core 3 with the expanded end as the starting end. After threading, the starting end should be 5 mm away from the sleeve joint, and the other end of the tube should be less than 3 mm away from the end of the inner core rod 18.

[0076] In this step, the lower bending part of the silicone oil wiping mold core should be wiped with a dust-free cloth. The tube blank should be at a certain distance from the sleeve joint 19 and the inner core rod 18 to ensure that the tube blank can be extended during vulcanization and demolded after vulcanization, so as to ensure the uniformity of the tube blank mouth. When inserting the core, if the tube blank is found to be deformed, twisted, bulged, concave, or exposed after inserting the core, the tube blank should be replaced immediately.

[0077] After the S4 mold core 3 is threaded through the tube, it is placed in the lower mold cavity 5. The upper mold 2 is pressed down and matched with the lower mold 1. The pressure is continuously increased until the upper mold 2 and the lower mold 1 are completely locked. The locking pressure is 20 MPa.

[0078] In this step, the upper mold 2 can be lifted and lowered by the pressurized and heated lifting platform 22 to perform pressurized mold clamping. The clamping should be fast at first and then slow to ensure that the air between the upper mold 2 and the lower mold 1 is evenly discharged.

[0079] After S5 mold clamping, the temperature is raised to 180℃~190℃ for vulcanization, and the vulcanization time is 6min~10min;

[0080] In this step, similarly, the upper mold 2 can be heated by the aforementioned pressurized heating lifting platform 22 to heat the mold core 3 .

[0081] In this step, the heating time is 3 minutes to 5 minutes. After the temperature reaches 180°C to 190°C, vulcanization is performed for 6 to 10 minutes.

[0082] S6 After the vulcanization is completed, the mold is opened, the lower mold 1 and the mold core 3 are removed, and the vulcanized tube blank is removed;

[0083] In this step, when the tube is removed, the residual edge of the tail end of the tube, that is, the end away from the end of the inner core rod 18, should be cleaned. If the residual edge is not cleaned, it is very easy to enter the interior of the tube when the core is removed, making it difficult to clean.

[0084] S7: The mold core 3 is immersed in water for cooling. The immersion time is at least 20 seconds. After the immersion, the temperature of the mold core 3 is lower than 40° C. After the immersion, the water stains are wiped off.

[0085] In this step, the temperature of the inner core rod 18 should be lower than 40° C. to avoid the phenomenon of exposed lines on the inner wall of the tube blank caused by excessive temperature.

[0086] S8 cleans the lower mold 1, reassembles the lower mold 1 and the mold core 3, and repeats steps S3-S7.

[0087] Based on the above steps, this process can quickly and efficiently vulcanize tube blanks to prepare fabric-reinforced rubber tubes. The process is simple and efficient. The prepared fabric-reinforced rubber tubes have high dimensional accuracy and product consistency, and are particularly suitable for preparing fabric-reinforced rubber tubes.

[0088] It should be noted that for fabric-reinforced rubber tubes made of some special raw materials, such as fluororubber tubes and silicone rubber tubes, after step S3 is completed, it is necessary to evenly wrap a layer of isolation material, such as nylon water-coated cloth, on the surface of the tube blank to prevent the reaction between the vulcanizer and oxygen during the vulcanization process, thereby preventing the vulcanizer from failing and causing insufficient vulcanization.

[0089] The above are the embodiments of the present invention. The foregoing are the preferred embodiments of the present invention. If the preferred implementation methods in each preferred embodiment are not obviously self-contradictory or based on a preferred implementation method, each preferred implementation method can be arbitrarily superimposed and used in combination. The embodiments and the specific parameters in the embodiments are only for the purpose of clearly describing the invention verification process of the inventor, and are not used to limit the scope of patent protection of the present invention. The scope of patent protection of the present invention is still subject to its claims. Any equivalent structural changes made by using the contents of the description and drawings of the present invention should also be included in the scope of protection of the present invention.

Claims

1. A vulcanization molding process for a fabric-reinforced rubber tube, characterized in that: A fabric-reinforced rubber tube blank vulcanization mold is used, the fabric-reinforced rubber tube blank vulcanization mold comprising a mold core (3), the mold core (3) mainly consisting of a mold core frame (17), both sides of the mold core frame (17) are connected to a plurality of sleeve joints (19) arranged at intervals, the sleeve joints (19) on both sides are symmetrical and staggered, and the ends of the plurality of sleeve joints (19) are connected to inner core rods (18) for penetrating the tube blank; A lower mold (1) is used to support the mold core (3), and a lower mold cavity (5) is formed on the upper end surface of the lower mold (1); An upper mold (2) is used to press the mold core (3), and an upper mold cavity (12) is formed on the lower end surface of the upper mold (2); in, The upper mold cavity (12) and the lower mold cavity (5) can be paired with each other to form a core mold cavity, and the core mold (3) can be pressed between the lower mold (1) and the upper mold (2) and enclosed in the core mold cavity; The upper end surface of the lower mold (1) is symmetrically provided with inwardly concave cavities (11) on both sides, and the lower end surface of the upper mold (2) is symmetrically provided with protrusions (14) that cooperate with the concave cavities (11). The bottom surface of the concave cavity (11) and the surface of the protrusion (14) are both inclined surfaces, and the lower mold cavity (5) or the upper mold cavity (12) extends into the concave cavity (11) or the protrusion (14) along the inclined surface portion. The cavity (11) is also symmetrically provided with vertical through holes (4) penetrating the lower die (1); The tube blank vulcanization molding process comprises the following steps: S1 uses rubber extrusion equipment to prepare tube blanks with fabric reinforcement layers; The port at one end of the S2 tube is expanded, and the inner wall of the tube is sprayed with a release agent twice, with the tail end of the tube blocked during spraying; S3: Wipe the inner core rod (18) of the mold core (3) with silicone oil, and insert the tube blank onto the inner core rod (18) with the expanded end as the starting end. After insertion, the starting end is 5 mm away from the sleeve joint (19), and the other end of the tube blank is less than 3 mm away from the end of the inner core rod (18); After the S4 mold core (3) is completed with the tube blank, it is placed in the lower mold cavity (5), the upper mold (2) is pressed down and matched with the lower mold (1), and the pressure is continuously increased until the upper mold (2) and the lower mold (1) are completely locked, and the locking pressure is 20MPa; After S5 mold clamping, the temperature is raised to 180℃~190℃ for vulcanization, and the vulcanization time is 6min~10min; S6 After the vulcanization is completed, the mold is opened, the lower mold (1) and the mold core (3) are taken out, and the vulcanized tube blank is removed. When the tube blank is removed, the remaining edge of the tube blank, that is, the end away from the end of the inner core rod (18), is cleaned; S7: soaking the mold core (3) in water for cooling, the soaking time is at least 20 seconds, the temperature of the inner core rod (18) is lower than 40° C. after soaking, and wiping off the water stains after the soaking is completed; S8: Clean the lower mold (1), reassemble the lower mold (1) and the mold core (3), and repeat steps S3-S7.

2. The process for vulcanizing and molding a tube blank of a fabric-reinforced rubber tube according to claim 1, characterized in that: The two ends of the core frame (17) are connected to fixed blocks (15) extending out of the core cavity. Core positioning holes (16) are provided between the two ends of the core frame (17) and between the fixed blocks (15). A core positioning column (9) plugged into the core positioning hole (16) is also provided in the lower mold cavity (5).

3. The process for vulcanizing and molding a tube blank of a fabric-reinforced rubber tube according to claim 2, characterized in that: Both ends of the core frame (17) are also provided with through holes (20).

4. The process for vulcanizing and molding a tube blank of a fabric-reinforced rubber tube according to claim 1, characterized in that: The inner core rod (18) has a serpentine bending structure, and is mainly composed of a straight pipe portion connected to the sleeve joint, an elbow portion integrally formed with the straight pipe portion, and a lower bending portion integrally formed with the elbow portion.

5. The process for vulcanizing and molding a tube blank of a fabric-reinforced rubber tube according to claim 1, characterized in that: The upper end surface of the lower mold (1) is provided with a mold positioning hole (10), and the lower end surface of the upper mold (2) is provided with a mold positioning column (13) plugged into the mold positioning hole (10).

6. A tube blank vulcanization equipment for a fabric-reinforced rubber tube, comprising a tube blank vulcanization equipment body (21), the tube blank vulcanization equipment body (21) being provided with a clamping platform (23) and a pressurized heating lifting platform (22), characterized in that: Also includes the tube blank vulcanization molding process according to any one of claims 1 to 5; The upper mold (2) is fixed on a pressurized and heated lifting platform (22), the lower mold (1) is clamped on a clamping platform (23), and the mold core (3) is pressed between the lower mold (1) and the upper mold (2).

7. The tube blank vulcanizing equipment according to claim 6, characterized in that: The clamp platform (23) is also provided with a clamp clamped on both sides of the lower mold (1), the clamp including a positioning plate (26), one side of which is provided with at least two clamping notches (27), and the upper end of the positioning plate (26) is also symmetrically provided with a positioning block (24), and the positioning block (24) is threadedly connected with a tightening bolt (25).

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