A vacuum impregnation device for fiber braided pultruded pipes

Abstract

The present invention relates to the technical field of pultruded pipe manufacturing, and discloses a vacuum dipping device for fiber braided pultruded pipes, comprising a dipping mold, a vacuum system for vacuum dipping the dipping mold from the inside out, and a support frame for adjusting and supporting the dipping mold. The dipping mold comprises an inner mold and a vacuum dipping box tightly sleeved outside the inner mold; the inner mold comprises a core mold and a dipping cylinder, the dipping cylinder being sleeved outside the dipping area of ​​the core mold and being concentric and coaxial with the core mold; a fiber braid is sleeved outside the dipping cylinder and sealed within the vacuum dipping box; glue liquid is injected into the dipping cavity in the core mold, the vacuum system vacuums the cavity in the vacuum dipping box to expel air from the fiber braid, and the glue liquid flows through the core mold and the dipping cylinder in sequence to completely soak the fiber braid. The present invention fully soaks the glue liquid into the fiber braid from the inside out through an internal pressure and external vacuum dipping method. After thermosetting, the internal structure of the fiber braid is more compact, and the overall rigidity and bending resistance are superior.

Description

Technical Field

[0001] The invention relates to the technical field of pultruded pipe manufacturing, in particular to a vacuum glue-impregnation device for fiber braided pultruded pipes. Background Art

[0002] Nowadays, fiber braided winding pultruded pipe technology is becoming more and more mature. The product has excellent mechanical properties, corrosion resistance, and long service life, making it widely used in construction, chemical, electric power and other industries.

[0003] Dipping is a crucial step in the production of continuous fiber braided and extruded pipes. The fiber braid serving as the reinforcement layer is typically formed through weaving or other methods, making it impossible to pre-impregnate individual fibers with glue before molding. The formed fiber braid is relatively compact, making it difficult for traditional immersion dipping methods to quickly and evenly penetrate the adhesive within the braid. Furthermore, during the production process, the braid continuously moves in the direction of pull, necessitating a device that can uniformly dip the entire moving braid into glue within a short period of time.

[0004] Prior art 1:

[0005] The pre-impregnation method is used to produce braided fiber pultruded pipes. A resin spray structure is set on the upper part of the fiber braided layer, and side glue roller structures are respectively set on the lower part and left and right positions of the fiber braided layer. The side glue roller structures are provided with glue grooves. A bottom glue roller is set at the lower center of the fiber braided layer, and the bottom glue roller is provided with a glue overflow port. The pre-impregnation principle is a spray plus three-roller pressure dipping method.

[0006] Disadvantages of the prior art 1:

[0007] Prior art uses a spray-and-roller coating method for dipping. The glue is naturally sprayed onto the upper half of the fiber braid, making it difficult to penetrate the inner portion of the fiber braid in a short period of time without pressure. The lower half uses a roller coating method to infiltrate the glue into the fiber yarn under a certain pressure. Because the upper and lower parts of the fiber braid are impregnated using different methods, the upper and lower parts of the fiber braid experience different impregnation effects after the dipping process, resulting in different mechanical properties in the upper and lower parts of the thermosetting product. Furthermore, the outside-in dipping method also makes it difficult to completely expel air from the braid, resulting in pores within the formed product, affecting its mechanical properties.

[0008] Prior art 2:

[0009] This dipping method completes the dipping operation by spraying and smoothing and squeezing. The glue is sprayed onto the outer surface of the braided layer by multiple nozzles arranged along the annular tube, and then the brush is driven by the rotating group to rotate to evenly coat the glue on the side wall of the braided layer. At the same time, the connecting ring drives the rolling roller to press the glue onto the braided layer, thereby achieving the effect of rapid and uniform dipping of the braided layer with glue.

[0010] Disadvantages of the second prior art:

[0011] The second existing technology uses a dipping method of spray coating and rolling. During the dipping operation, pressure will be generated from the outside to the inside, and air will enter the fiber braid along with the glue and will be difficult to discharge. Pores will be generated inside the molded product, affecting its mechanical properties.

[0012] Existing technology three:

[0013] This dipping method involves immersing the moving fiber braid in a sealed resin cartridge. The adhesive is then injected into a vacuum box through a feed port. The feed port is closed and the vacuum equipment is started. Utilizing the principle of vacuum, the air rises and ruptures rapidly under negative pressure, allowing the resin to quickly penetrate into the fiber layer, completing the dipping process.

[0014] Disadvantages of the existing technology three:

[0015] The existing technology three dipping method requires constant observation of the glue liquid in the vacuum box and timely replenishment during the production process. Although a certain amount of air can be discharged under the action of vacuum negative pressure, the dipping method from the outside to the inside will cause a certain amount of air to remain in the fiber braid, causing pores inside the molded product, affecting its mechanical properties. Summary of the Invention

[0016] In order to overcome or alleviate one or more of the above technical problems, the purpose of the present invention is to provide a vacuum impregnation device for fiber braided pultruded pipes, which is arranged at the front end of the forming mold, seals the preformed fiber braid in the vacuum impregnation box of the impregnation mold, and uses the internal pressure and external vacuum impregnation method to make the glue penetrate the braid from the inside of the braid to the outside of the braid, so that the glue and the fiber are fully impregnated.

[0017] The present invention provides the following technical solutions:

[0018] A fiber braided pultruded pipe vacuum dipping device, comprising a dipping mold (100), a vacuum system (400) for vacuum dipping the dipping mold (100) from the inside out, and a support frame (500) for adjusting and supporting the dipping mold (100), wherein the dipping mold (100) comprises an inner mold (200) and a vacuum dipping box (300) hermetically sleeved outside the inner mold (200); the inner mold (200) comprises a core mold (210) and a dipping cylinder (230), wherein the dipping cylinder (230) is sleeved on the core mold. The fiber braid (600) is arranged outside the glue dipping area (370) of the core mold (210) and is coaxial with the core mold (210); the fiber braid (600) is sleeved outside the glue dipping cylinder (230) and is sealed in the vacuum glue dipping box (300); the glue liquid is injected into the glue dipping cavity (213) in the core mold (210), and the vacuum system (400) vacuumizes the cavity in the vacuum glue dipping box (300) to discharge the air in the fiber braid, and the glue liquid flows through the core mold (210) and the glue dipping cylinder (230) in turn to completely soak the fiber braid (600).

[0019] According to some embodiments, the vacuum glue dipping box (300) includes an upper cover (310) and a bottom cover (320) both of which are semi-cylindrical, the upper cover (310) and the bottom cover (320) are sealed and spliced ​​together, and the inner walls thereof are provided with corresponding semi-cylindrical glue dipping nets (330), and the glue dipping nets (330) are provided with a plurality of strip-shaped first through holes (331); the vacuum channel (311) is provided at the top of the upper cover (310), and the drain port (321) is provided at the bottom of the bottom cover (320).

[0020] According to some embodiments, a plurality of second through holes (231) are arranged on the body of the dipping cylinder (230), and the second through holes (231) include a strip-shaped second dipping groove (2311) provided on the outer wall of the dipping cylinder (230), and a second dipping hole (2312) leading to the interior is provided at the bottom of the second dipping groove (2311), and the notch area of ​​the second dipping groove (2311) is larger than the through hole area of ​​the second dipping hole (2312).

[0021] According to some embodiments, a glue injection hole (212) is provided at the head end of the core mold (210), which is connected to the glue dipping chamber (213) through the glue injection channel (214), and a plurality of third through holes (210) are arranged at corresponding positions of the core mold (210) and the vacuum glue dipping box (300).

[0022] According to some embodiments, both ends of the dipping zone (370) are provided with limiting steps (360), and at least one annular sealing ring (340) is provided on the limiting step (360). A cylindrical limiting end (220) is fixedly provided at the tail end of the dipping zone (370), and the limiting end (220), the dipping tube (230) and the core mold (210) at the head end have the same outer diameter.

[0023] According to some embodiments, the vacuum system (400) includes a PLC control system (401), which controls a liquid ring vacuum pump (402) to adjust the negative pressure in the vacuum dipping box (300), and synchronously controls a first screw pump (411) to transport glue from the material trough (410) to the dipping chamber (213), and controls a second screw pump (406) to transport glue from the vacuum separation tank (403) to the material trough (410); the vacuum The vacuum separation tank (403) is provided between the glue dipping box (300) and the liquid ring vacuum pump (402) for separating and processing the glue liquid that is accidentally inhaled; a liquid level sensor (404) is provided on the vacuum separation tank (403), and the liquid level sensor (404) is electrically connected to the PLC control system (401); a one-way valve (407) is provided between the second screw pump (406) and the material trough (410), and a glue liquid recovery tank (405) is provided outside the liquid discharge port (321).

[0024] According to some embodiments, a ball valve (322) is provided between the drain port (321) and the glue recovery tank (405), and a vacuum pressure gauge (408) is provided on the pipeline between the liquid ring vacuum pump (402) and the vacuum separation tank (403).

[0025] According to some embodiments, the support frame (500) includes multiple groups of adjusting screws (501) and adjusting grooves (502) arranged on both sides of the dipping mold, the adjusting screws (501) are used for vertical adjustment, and the adjusting grooves (502) are used for radial adjustment. Through the synchronous cooperation of multiple groups, the vacuum dipping box (300) is positioned at a concentric and coaxial position of the core mold (210).

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] This invention provides a vacuum impregnation device for fiber-braided pultruded pipes. This device uses internal pressure and external vacuum impregnation to fully infiltrate the fiber braid from the inside out, while vacuum extraction removes air from the braid. Compared to traditional immersion and single-fiber pre-impregnation processes, as well as outside-in vacuum impregnation, products produced using this internal pressure and external vacuum impregnation process have a denser internal structure after thermosetting, with superior overall rigidity and bending resistance.

[0028] The present invention solves the problem of fully impregnating the entire moving fiber braid during the production process of the fiber braided pultruded pipe. During the production process, the moving fiber braid is wrapped in the impregnation area of ​​the impregnation mold by the channel formed between the inner mold and the vacuum impregnation box, so that the fiber braid in the impregnation mold is impregnated as a whole in a short time through the impregnation method of internal pressure and external vacuum, and the internal air is discharged. In the vacuum system, the vacuum separation tank is arranged between the impregnation mold and the liquid ring vacuum pump, and is provided with a liquid level sensor. The glue liquid that is accidentally inhaled is separated by the vacuum separation tank to prevent it from entering the vacuum pipeline. When the glue liquid reaches the set limit, the screw pump is started to transport the separated glue liquid back to the material tank for recycling. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A schematic structural diagram of a vacuum impregnation device for fiber braided pultruded pipes provided in an embodiment of the present invention.

[0030] Figure 2 An axonometric diagram of a vacuum system provided in an embodiment of the present invention.

[0031] Figure 3 A front view of a vacuum system according to an embodiment of the present invention.

[0032] Figure 4 A right side view of a vacuum system provided in an embodiment of the present invention.

[0033] Figure 5 A schematic diagram of a dipping mold provided in an embodiment of the present invention.

[0034] Figure 6 An exploded view of the dipping mold provided in an embodiment of the present invention.

[0035] Figure 7a An exploded view of the dipping cylinder and dipping mold provided in an embodiment of the present invention.

[0036] Figure 7b An exploded view of the inner mold provided in an embodiment of the present invention.

[0037] Figure 8 This is an exploded view of the vacuum dipping box provided in an embodiment of the present invention.

[0038] Figure 9 Schematic diagram of the dipping cylinder provided in an embodiment of the present invention

[0039] Figure 10 This is an axial cross-sectional view of a vacuum impregnation device for fiber braided pultruded pipes provided in an embodiment of the present invention.

[0040] Figure 11 A radial cross-sectional view of a vacuum impregnation device for fiber braided pultruded pipes provided in an embodiment of the present invention.

[0041] In the picture:

[0042] Dipping mold 100; inner mold 200; core mold 210; third through hole 211; injection hole 212; dipping cavity 213; injection channel 214; limit end 220; limit end mounting hole 221; dipping cylinder 230; second through hole 231; second dipping tank 2311; second dipping hole 2312; vacuum dipping box 300; upper cover 310; bottom cover 320; dipping net 330; first through hole 331; vacuum channel 311, drain port 321, ball valve 322; seal Ring 340; vacuum area 350; limiting step 360; glue dipping area 370; vacuum system 400; PLC control system 401; liquid ring vacuum pump 402; vacuum separation tank 403; liquid level sensor 404; glue recovery tank 405; second screw pump 406; one-way valve 407; vacuum pressure gauge 408; vacuum pipeline 409; material trough 410; first screw pump 411; support frame 500; adjusting screw 501; adjusting tank 502; fiber braid 600. DETAILED DESCRIPTION

[0043] The present invention is described in detail below with reference to the embodiments and accompanying drawings. However, it should be understood that the embodiments and accompanying drawings are merely exemplary descriptions of the present invention and do not constitute any limitation on the scope of protection of the present invention. All reasonable variations and combinations within the scope of the inventive concept of the present invention fall within the scope of protection of the present invention.

[0044] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "front", "rear", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the devices or components referred to must have a specific direction, be constructed and operate in a specific direction, and therefore should not be understood as limiting the present invention. The terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. In addition, unless otherwise expressly specified and limited, the terms "disposed", "installed", "connected", and "connected" should be understood in a broad sense. For example, they can be fixedly connected, detachably connected, or integrally connected; they can be mechanically connected or electrically connected; they can be directly connected or indirectly connected through an intermediate medium, or they can be internal communication between two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] The present invention will be further described below with reference to the accompanying drawings.

[0046] Example 1

[0047] like Figure 1 This embodiment provides a vacuum impregnation device for fiber braided pultruded pipes. The device is located at the front end of a forming mold and includes a mold 100, a vacuum system 400 for vacuuming the mold 100 from the inside out, and a support frame 500. The support frame 500 is located below the mold 100 and is used to adjust and support the mold 100.

[0048] like Figure 5 The dipping mold 100 includes an inner mold 200 and a vacuum dipping box 300. Figure 7a and Figure 7b The inner mold 200 includes a core mold 210 located inside, a dipping cylinder 230 and a limiting end 220 for limiting the position of the dipping cylinder 230. The dipping cylinder 230 is used to dip the fiber braid from the inside to the outside. It is concentrically and coaxially sleeved outside the dipping area 370 of the core mold 210 and is fixed to the dipping area 370 by bolts through the limiting end 220.

[0049] like Figure 8 The cylindrical vacuum glue dipping box 300 is assembled from a semi-cylindrical upper cover 310 and a bottom cover 320, and is fastened to the support frame 500 by bolts. The inner walls of the upper cover 310 and the bottom cover 320 are provided with corresponding semi-cylindrical glue dipping nets 330. A vacuum channel 311 is provided at the top of the upper cover 310, and a drain port 321 is provided at the bottom of the bottom cover 320. A ball valve 322 is provided outside the drain port 321. A cavity for accommodating glue liquid is provided within the core mold 210, which is the glue dipping chamber 213. The cavity between the glue dipping cylinder 230 and the upper and lower covers forms a vacuum zone 350. At least one sealing ring 340 is provided at both ends of the inner walls of the upper cover 310 and the bottom cover 320, corresponding to the outer wall of the glue dipping cylinder 230. The drain port 321 is used to discharge glue liquid that overflows into the vacuum zone 350 during the production process.

[0050] The impregnation net 330 is provided with strip-shaped first through holes 331 which are staggered and densely distributed in the radial and axial directions of the impregnation net 330. After the impregnation net 330 is installed synchronously with the vacuum impregnation box 300, the overall inner diameter is consistent with the outer diameter of the fiber braid. Through the impregnation cylinder 230 arranged in the impregnation area of ​​the core mold 200, the purpose of wrapping the fiber braid in the impregnation area is achieved during the production process, and under the action of vacuum negative pressure, the air inside the fiber braid is extracted through the first through holes 331.

[0051] like Figures 5-6 The vacuum dipping box 300 is coaxially sleeved on the outside of the core mold 210. A glue injection hole 212 is provided at the front end of the core mold 210. A ball valve 322 is provided outside the glue injection hole 212. The glue is injected into the dipping cavity 213 along the glue injection channel 214 inside the core mold 210.

[0052] like Figure 7aThe core mold 210 is provided with limiting steps 360 at both ends of the dipping cylinder 230, and a dipping area is formed between the limiting steps 360 at both ends. The limiting steps 360 are provided with one or more sealing rings 340 in the axial direction of the dipping cylinder 230, and a sealing gasket is provided on the end surface in contact with the dipping cylinder 230. The dipping area 370 of the core mold 210 is provided with multiple third through holes 211 on the radial and axial cylinder wall corresponding to the dipping cylinder 230, and a limiting end mounting hole 221 is provided at its left end. A sealing gasket is provided on the end surface in contact with the dipping cylinder 230 of the limiting end 220. The limiting end 220 is installed at the tail end of the core mold 210, and the dipping cylinder 230 is fixed to the dipping area 370 by bolts. From left to right, the outer diameters of the limiting end 220, the dipping cylinder 230 and the right end core mold 210 are consistent, ensuring the normal traction movement of the fiber braid during the traction operation. The dipping cylinder 230 of this structure performs two functions. First, after installation, its outer diameter is the same as the outer diameter of the core mold 210, forming a complete inner mold 200, ensuring that the fiber braid moves smoothly along the traction direction during the production process, and cooperates with the vacuum dipping box 300 to fix the fiber braid in the dipping area 370; second, through the second through hole 231 set in the dipping cylinder 230, the glue liquid flows from the dipping chamber 213 from the inside to the outside to the fiber braid, thereby achieving the purpose of dipping from the inside to the outside.

[0053] like Figure 9 The dipping cylinder 230 is provided with a second through hole 231. Specifically, the second through hole 231 is structured to include an outer second dipping groove 2311 and an inner second dipping hole 2312. The outer wall of the dipping cylinder 230 is provided with a strip-shaped second dipping groove 2311, and the inner wall is provided with second dipping holes 2312 opposite to each other. The second dipping holes 2312 communicate with the dipping groove 2311 and are staggered and densely distributed in the radial and axial directions of the dipping cylinder 230. The second dipping groove 2311 is larger than the second dipping holes 2312, effectively increasing the contact area between the glue and the fiber braid during the dipping operation. Under the action of internal pressure, the glue flows along the second glue holes 2312 on the inner wall of the glue cylinder 230 to the second glue tank 2311 on the outer wall. During the production process, the fiber braided body continues to move axially along the traction direction. During this process, the entire surface of its inner wall is completely in contact with the densely staggered second glue tanks 2311. The glue quickly penetrates from the inner wall of the fiber braided body to the outer wall, achieving the purpose of overall infiltration.

[0054] like Figures 2-4 The vacuum system 400 includes a PLC control system 401, a liquid ring vacuum pump 402, a vacuum separation tank 403, a liquid level sensor 404, a glue recovery tank 405, a first screw pump 411, a second screw pump 406, a one-way valve 407, a vacuum pressure gauge 408 and a vacuum pipeline 409.

[0055] The specific structure of the vacuum system 400 is as follows:

[0056] The vacuum system 400 includes two sets of screw pumps, namely a first screw pump 411 and a second screw pump 406:

[0057] The first screw pump 411 is arranged between the material tank 410 and the glue injection hole 212 , and its function is to transport the glue liquid in the material tank 410 to the glue dipping chamber 213 .

[0058] The second screw pump 406 is arranged at the rear end of the vacuum separation tank 403. When the separated glue liquid reaches a set value, the second screw pump 406 is started to transport the recovered glue liquid back to the material tank 410.

[0059] The PLC control system 401 controls the liquid ring vacuum pump 402 to adjust the negative pressure within the vacuum impregnation tank 300 and simultaneously controls the first screw pump 411 to adjust the delivery volume and pressure of the glue liquid. A vacuum separator tank 403 is located between the vacuum impregnation tank 300 and the liquid ring vacuum pump 402. This separator tank 403 is used to handle any glue liquid that is accidentally aspirated. A liquid level sensor 404 is installed on the separator tank 403. A check valve 407 is located between the second screw pump 406 and the material tank 410 to prevent glue liquid backflow. A glue liquid recovery tank 405 is located outside the drain port 321, and a ball valve 322 is installed between the drain port 321 and the glue liquid recovery tank 405. A vacuum pressure gauge 408 is installed on the pipeline between the liquid ring vacuum pump 402 and the separator tank 403 to display the real-time pressure of the vacuum system, facilitating pressure adjustment. A vacuum line 409 is connected to the outlet of the separator tank 403 at one end and to the vacuum channel 311 at the other.

[0060] The specific workflow is as follows:

[0061] The mixed glue is injected into the material tank 410 and delivered to the dipping chamber 213 via the first screw pump 411. The first screw pump 411 uses a variable frequency speed control motor, and the glue delivery volume and delivery pressure are controlled by the PLC control system 401. The fiber braid enters the dipping mold under the action of the traction machine. The glue is injected into the dipping chamber 213 within the core mold 210 through the glue injection hole 212 at the front end of the core mold 210. Under the action of pressure, it flows from the dipping chamber 213 from the inside to the outside. The vacuum system 400 removes the air in the vacuum dipping box 300 to form a negative pressure vacuum zone. Using the dipping method of internal pressure and external vacuum, the glue is radially penetrated from the inside to the outside of the fiber braid, while simultaneously expelling the air inside the fiber braid.

[0062] The vacuum system 400 controls the liquid ring vacuum pump 402 via a PLC control system 401 to adjust the negative pressure within the vacuum impregnation tank 300. It also simultaneously controls the first screw pump 411 to adjust the glue delivery volume and pressure, balancing the internal pressure and external vacuum. This allows the glue to penetrate the fiber woven material without entering the vacuum system 400. A vacuum separator tank 403 is located between the vacuum impregnation tank 300 and the liquid ring vacuum pump 402. This separates glue that is accidentally drawn into the vacuum line 409, preventing it from entering the liquid ring vacuum pump 402 line. The vacuum separator tank 403 is equipped with a liquid level sensor 404. When the glue reaches a set limit, the second screw pump 406 is activated to transport the separated glue back to the material trough 410 for recycling. A one-way valve 407 is located between the second screw pump 406 and the material trough 410 to prevent backflow of the glue. During the production process, the glue liquid overflowing from the dipping mold 100 into the vacuum area flows into the glue liquid recovery tank 405 through the drain port 321. A ball valve 322 is provided between the drain port 321 and the glue liquid recovery tank 405. During non-recovery operation, the ball valve 322 is in a normally closed state to ensure the sealing of the vacuum area.

[0063] The vacuum system 400 controls the delivery pressure of the glue and the vacuum negative pressure so that the glue just penetrates the fiber braid without entering the vacuum dipping box 300. The vacuum dipping box 300 extracts the air from the fiber braid from the inside to the outside and applies suction to the glue flowing from the inside to the outside.

[0064] The support frame 500 includes four sets of adjusting screws 501 and adjusting slots 502 arranged on both sides of the dipping mold. The adjusting screws 501 are used for vertical adjustment, and the adjusting slots 502 are used for radial adjustment. Their function is to synchronize multiple groups to position the vacuum dipping box 300 in a concentric and coaxial position with the core mold 210.

[0065] like Figures 10-11 During the production process, the fiber braid, driven by a traction machine, continuously moves along the axial direction of the core mold 210 and enters the dipping mold 100. It is sealed within the dipping mold 100 by multiple sealing rings 340 positioned between the inner wall of the vacuum dipping box 300 and the outer wall of the dipping cylinder 230. The vacuum pumping principle creates a negative pressure zone within the vacuum dipping box 300. The glue is injected into the dipping chamber 213 through the glue injection channel 214 of the core mold 210. Under the influence of internal pressure and external vacuum, the glue penetrates the fiber braid radially from the inside outward and extracts the air inside the fiber braid, achieving the goal of rapidly and continuously dipping the moving fiber braid.

[0066] The above embodiments are merely preferred embodiments of the present invention, and the scope of protection of the present invention is not limited to the above embodiments. All technical solutions that fall within the scope of protection of the present invention are within the scope of protection of the present invention. It should be noted that improvements and modifications that can be made by a person skilled in the art without departing from the principles of the present invention are also considered to be within the scope of protection of the present invention.

Claims

1. A vacuum impregnation device for fiber braided pultruded pipes, characterized by: The invention comprises a dipping mold (100), a vacuum system (400) for vacuum dipping the dipping mold (100) from the inside out, and a support frame (500) for adjusting and supporting the dipping mold (100), wherein the dipping mold (100) comprises an inner mold (200) and a vacuum dipping box (300) hermetically sleeved outside the inner mold (200); the inner mold (200) comprises a core mold (210) and a dipping cylinder (230), wherein the dipping cylinder (230) is sleeved on the dipping area of ​​the core mold (210). (370), and is coaxial and concentric with the core mold (210); the fiber braid (600) is sleeved outside the dipping cylinder (230) and sealed in the vacuum dipping box (300); the glue liquid is injected into the dipping cavity (213) in the core mold (210), and the vacuum system (400) vacuumizes the cavity in the vacuum dipping box (300) to discharge the air in the fiber braid, and the glue liquid flows through the core mold (210) and the dipping cylinder (230) in sequence to completely soak the fiber braid (600); The dipping cylinder (230) is provided with a plurality of second through holes (231), the second through holes (231) comprising a strip-shaped second dipping groove (2311) provided on the outer wall of the dipping cylinder (230), the bottom of the second dipping groove (2311) being provided with a second dipping hole (2312) leading to the interior, the notch area of ​​the second dipping groove (2311) being larger than the through hole area of ​​the second dipping hole (2312); A glue injection hole (212) is provided at the head end of the core mold (210), which is connected to the glue dipping chamber (213) via a glue injection channel (214) in the core mold (210). A plurality of third through holes (211) are arranged at corresponding positions of the core mold (210) and the vacuum glue dipping box (300).

2. The vacuum impregnation device for fiber braided pultruded pipes according to claim 1, characterized in that: The vacuum glue dipping box (300) comprises an upper cover (310) and a bottom cover (320), both of which are semi-cylindrical. The upper cover (310) and the bottom cover (320) are sealed and spliced ​​together, and the inner walls thereof are provided with corresponding semi-cylindrical glue dipping nets (330). The glue dipping nets (330) are provided with a plurality of strip-shaped first through holes (331). The vacuum channel (311) is provided at the top of the upper cover (310), and the liquid discharge port (321) is provided at the bottom of the bottom cover (320).

3. The vacuum impregnation device for fiber braided pultruded pipes according to claim 2, characterized in that: The vacuum system (400) includes a PLC control system (401), which controls a liquid ring vacuum pump (402) to adjust the negative pressure in the vacuum dipping box (300), and synchronously controls a first screw pump (411) to transport glue liquid from the material trough (410) to the dipping chamber (213), and controls a second screw pump (406) to transport glue liquid from the vacuum separation tank (403) to the material trough (410); the vacuum dipping box (300) 0) and the liquid ring vacuum pump (402), and is used to separate and process the glue liquid that is accidentally inhaled; a liquid level sensor (404) is provided on the vacuum separation tank (403), and the liquid level sensor (404) is electrically connected to the PLC control system (401); a one-way valve (407) is provided between the second screw pump (406) and the material tank (410), and a glue liquid recovery tank (405) is provided outside the discharge port (321).

4. The vacuum impregnation device for fiber braided pultruded pipes according to claim 3, characterized in that: A ball valve (322) is provided between the liquid discharge port (321) and the glue recovery tank (405), and a vacuum pressure gauge (408) is provided on the pipeline between the liquid ring vacuum pump (402) and the vacuum separation tank (403).

5. The vacuum impregnation device for fiber braided pultruded pipes according to claim 4, characterized in that: The support frame (500) comprises a plurality of adjustment screws (501) and adjustment slots (502) provided on both sides of the dipping mold, wherein the adjustment screws (501) are used for vertical adjustment, and the adjustment slots (502) are used for radial adjustment. Through the synchronous cooperation of the plurality of adjustment screws, the vacuum dipping box (300) is positioned at a position concentric and coaxial with the core mold (210).

6. The vacuum impregnation device for fiber braided pultruded pipes according to claim 1, characterized in that: The dipping zone (370) is provided with limiting steps (360) at both ends, and at least one annular sealing ring (340) is provided on the limiting step (360). A cylindrical limiting end (220) is fixedly provided at the tail end of the dipping zone (370), and the limiting end (220), the dipping tube (230) and the core mold (210) at the head end have the same outer diameter.

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