High-temperature RTM injection machine

Abstract

The invention discloses a high-temperature RTM injection machine, and belongs to the technical field of injection machine equipment, the high-temperature RTM injection machine comprises a bottom plate, the top of the bottom plate is provided with an injection mechanism, a preheating mechanism, a material transfer mechanism, a vacuum mechanism and a control mechanism, the top of the bottom plate is fixedly connected with a mounting frame, and the injection mechanism comprises an injection tank rotationally mounted on the mounting frame; the injection cylinder is mounted at the top of the injection tank, an electric telescopic rod is mounted at the bottom of the injection tank, and the output end of the electric telescopic rod is fixedly connected with a piston head located on the inner side of the injection tank. Through the arrangement of the injection mechanism, the injection mechanism comprises an injection cylinder, an injection tank and a heat preservation heater, the structural design of integrating injection and heating is adopted, and the integration degree is high; the heating efficiency in the injection tank is high, the highest heating temperature is 300 DEG C, heating is uniform, and peripheral resin can be prevented from being cured in advance, so that injection failure is prevented; meanwhile, the injection cylinder and the injection tank have the automatic rotating function, and operation, cleaning and maintenance are convenient.

Description

Technical Field

[0001] The present invention relates to an injection machine device, in particular to a high-temperature RTM injection machine, belonging to the technical field of injection machine equipment. Background Art

[0002] Advanced composite materials are widely used in the aerospace industry due to their good specific strength and specific stiffness, corrosion resistance, and designability. Currently, composite materials used in aircraft are mainly epoxy resin-based composite materials with a temperature resistance grade of ≤120°C and bismaleimide resin-based composite materials with a temperature resistance grade of ≤200°C. Due to limitations in materials and molding process technology, the application of high-temperature resistant composite materials with a temperature resistance grade of ≥300°C is relatively slow. With the continuous development of hypersonic aircraft and aerospace vehicle technology, the demand for temperature resistance of aircraft structures is getting higher and higher. In order to take into account the requirements of temperature environment and light weight design, high-temperature resistant composite materials with high specific strength and specific stiffness are becoming increasingly important in aviation equipment.

[0003] At present, the application parts of high-temperature resistant composite materials have relatively simple shapes, and the molding process is mainly based on autoclave, high-temperature oven and other molding processes. Compared with the traditional autoclave process, RTM can be used to form complex shapes and structures. It is a solution to reduce the manufacturing cost of high-temperature resistant composite materials and can be used for the molding of structures such as integrated aircraft and tail cover.

[0004] Currently, the high-temperature RTM injection machines on the market have low injection temperatures and are unable to complete injection work at 300°C. They also have simple functions and low integration. They also have low heating efficiency and uneven heating, and the peripheral resin is prone to premature solidification, leading to injection failure.

[0005] The present invention proposes a new solution to the above problems. Summary of the Invention

[0006] The main purpose of the present invention is to provide a high-temperature RTM injection machine to solve the problems of low injection temperature and inability to complete injection work at 300°C on the current high-temperature RTM injection machines on the market; simple functions and low integration; low heating efficiency and uneven heating, and the peripheral resin is easily solidified prematurely, resulting in injection failure.

[0007] The purpose of the present invention can be achieved by adopting the following technical solutions:

[0008] A high-temperature RTM injection molding machine comprises a base plate, the top of which is provided with an injection mechanism, a preheating mechanism, a material transfer mechanism, a vacuum mechanism and a control mechanism; the top of the base plate is fixedly connected to a mounting frame; the injection mechanism comprises an injection tank rotatably mounted on the mounting frame, and an injection barrel mounted on the top of the injection tank; an electric telescopic rod is mounted on the bottom of the injection tank, the output end of the electric telescopic rod is fixedly connected to a piston head located inside the injection tank; a connecting pipeline is mounted on the injection barrel, a flexible pipeline heating jacket is detachably mounted on the outer wall of the connecting pipeline; and an insulation heater is mounted on the injection tank, and the heating range of the insulation heater is 250°C-300°C.

[0009] Preferably, the preheating mechanism includes a preheating tank and a cover plate movably mounted on the top of the preheating tank, a first motor is mounted on the top of the cover plate, an output end of the first motor is connected to an agitator located inside the preheating tank, a hoist connected to the cover plate is fixedly mounted on the top of the base plate, and a heating heater is provided on the inside of the preheating tank.

[0010] Preferably, the material transfer mechanism includes a feed pump, the input end of the feed pump is connected to the preheating tank through an input hose, the output end of the feed pump is connected to the injection tank through an output hose, and the feed pump is a metering pump.

[0011] Preferably, the vacuum mechanism includes a vacuum pump and a resin collection tank mounted on the base plate.

[0012] Preferably, a first insulation shell is installed on the outer wall of the injection tank, a second insulation shell located outside the preheating mechanism is fixedly installed on the top of the base plate, and a lock that cooperates with the cover plate is movably installed on the outer wall of the preheating tank.

[0013] Preferably, the bottom end of the injection barrel is fixedly connected to a connecting cap threadedly connected to the injection tank, a valve is installed on the injection barrel, and a handle is installed on the outer wall of the connecting cap.

[0014] Preferably, the output end of the elevator is connected to a fixing piece fixedly connected to the top of the cover plate, a sliding hole is penetrated through the fixing piece, and the top of the base plate is fixedly connected to a sliding rod that cooperates with the sliding hole.

[0015] Preferably, two rotating wheels are rotatably mounted on the fixing member and are respectively located on both sides of the sliding rod.

[0016] Preferably, rotating shafts are symmetrically connected to the outer walls on both sides of the injection tank, and a rotating sleeve that cooperates with the rotating shafts is fixedly connected to the top of the mounting frame.

[0017] Preferably, a second motor is fixedly mounted on the mounting frame, and an output end of the second motor is interconnected with one of the rotating shafts.

[0018] Beneficial technical effects of the present invention: According to the high-temperature RTM injection machine of the present invention, through the setting of the injection mechanism, the injection mechanism includes an injection cylinder, an injection tank and a thermal insulation heater, and adopts an integrated injection and heating structural design with a high degree of integration; the heating efficiency in the injection tank is high, the maximum heating temperature is 300°C, and the heating is uniform, which can prevent the peripheral resin from solidifying prematurely, thereby preventing injection failure; at the same time, it is equipped with an automatic rotation function of the injection tank, which is convenient for operation and cleaning and maintenance; through the setting of the flexible pipeline heating sleeve, it is used to heat the connecting pipeline between the heating injection cylinder and the mold, ensuring the temperature stability of the resin during the transfer to the mold. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of the overall structure of a preferred embodiment provided according to the present invention;

[0020] Figure 2 A side view of the overall structure of a preferred embodiment provided according to the present invention;

[0021] Figure 3 A schematic structural diagram of a mounting frame according to a preferred embodiment of the present invention;

[0022] Figure 4 This is an exploded view of a preheating mechanism according to a preferred embodiment of the present invention;

[0023] Figure 5 A schematic diagram of a cover structure according to a preferred embodiment of the present invention;

[0024] Figure 6 A cross-sectional view of the injection mechanism structure according to a preferred embodiment of the present invention.

[0025] In the figure: 1. Base plate; 2. Injection mechanism; 3. Preheating mechanism; 4. Material transfer mechanism; 5. Vacuum mechanism; 6. Control mechanism; 7. Mounting frame; 8. Injection tank; 9. Electric telescopic rod; 10. Injection barrel; 11. Preheating tank; 12. Cover plate; 13. First motor; 14. Agitator; 15. Hoist; 16. Feed pump; 17. Input hose; 18. Output hose; 19. Vacuum pump; 20. Resin collection tank; 21. Flexible pipe heating jacket; 22. First insulation shell; 23. Second insulation shell; 24. Lock; 25. Fixing part; 26. Slide hole; 27. Slide rod; 28. Rotary wheel; 29. ​​Rotary sleeve; 30. Rotary shaft; 31. Second motor; 32. Piston head; 33. Connecting cap; 34. Handle. DETAILED DESCRIPTION

[0026] In order to make the technical solution of the present invention more clear and specific to those skilled in the art, the present invention is further described in detail below with reference to embodiments and drawings, but the embodiments of the present invention are not limited thereto.

[0027] like Figures 1-6 As shown, the high-temperature RTM injection machine provided in this embodiment includes a base plate 1. The top of the base plate 1 is provided with an injection mechanism 2, a preheating mechanism 3, a material transfer mechanism 4, a vacuum mechanism 5 and a control mechanism 6. The top of the base plate 1 is fixedly connected to a mounting frame 7. The injection mechanism 2 includes an injection tank 8 rotatably mounted on the mounting frame 7, and an injection cylinder 10 mounted on the top of the injection tank 8. An electric telescopic rod 9 is installed at the bottom of the injection tank 8, and the output end of the electric telescopic rod 9 is fixedly connected to the piston head 32 located on the inner side of the injection tank 8. A connecting pipeline is installed on the injection cylinder 10, and a flexible pipeline heating jacket 21 is detachably installed on the outer wall of the connecting pipeline. An insulation heater is installed on the injection tank 8, and the heating range of the insulation heater is 250℃-300℃. Through the setting of the injection mechanism 2, the injection mechanism 2 includes an injection cylinder 10, an injection tank 8 and an insulation heater, and adopts an integrated injection and heating structural design with a high degree of integration; the heating efficiency inside the injection tank 8 is high, the maximum heating temperature is 300°C, and the heating is uniform, which can prevent the peripheral resin from solidifying prematurely, thereby preventing injection failure; at the same time, the injection tank 8 is equipped with an automatic rotation function, which is convenient for operation and cleaning and maintenance; through the setting of the flexible pipeline heating sleeve 21, it is used to heat the connecting pipeline between the injection cylinder 10 and the mold to ensure the temperature stability of the resin during the transfer to the mold.

[0028] In this embodiment, if Figure 2 、 Figure 4 and Figure 5 As shown, the preheating mechanism 3 includes a preheating tank 11 and a cover plate 12 movably mounted on the top of the preheating tank 11. A first motor 13 is mounted on the top of the cover plate 12. The output end of the first motor 13 is connected to an agitator 14 located inside the preheating tank 11. A hoist 15 connected to the cover plate 12 is fixedly mounted on the top of the bottom plate 1. A heating heater is provided on the inside of the preheating tank 11. A first insulation shell 22 is mounted on the outer wall of the injection tank 8. A second insulation shell 23 located outside the preheating mechanism 3 is fixedly mounted on the top of the bottom plate 1. A lock 24 is movably mounted on the outer wall of the preheating tank 11 and cooperates with the cover plate 12. The configuration of the preheating mechanism 3, including the preheating tank 11 and the agitator 14, can ensure that the resin is quickly and evenly heated to the target temperature. The configuration of the hoist 15 facilitates the opening and closing of the cover plate 12, making it easier to clean and maintain. The configuration of the insulation shell can prevent burns, reduce heat loss, and improve heating efficiency. The configuration of the lock 24 ensures airtightness.

[0029] In this embodiment, if Figure 1 、 Figure 2 and Figure 3 As shown, the material transfer mechanism 4 includes a feed pump 16. The input end of the feed pump 16 is interconnected with the preheating tank 11 via an input hose 17, and the output end of the feed pump 16 is interconnected with the injection tank 8 via an output hose 18. The feed pump 16 is a metering pump. Through the configuration of the material transfer mechanism 4, the feed pump 16 is a metering pump that can transfer resin from the preheating tank 11 to the injection tank 8. It also has a material volume automatic metering function, which is convenient for use.

[0030] In this embodiment, if Figure 1 、 Figure 2 and Figure 3 As shown, the vacuum mechanism 5 includes a vacuum pump 19 and a resin collecting tank 20 mounted on the base plate 1. The vacuum mechanism 5 is provided for degassing the resin and vacuuming the mold.

[0031] In this embodiment, if Figure 1 、 Figure 2 and Figure 6 As shown, the bottom end of the syringe 10 is fixedly connected to a connecting cap 33 that is threadedly connected to the injection tank 8. A valve is installed on the syringe 10, and a handle 34 is installed on the outer wall of the connecting cap 33. The setting of the connecting cap 33 makes it easy to disassemble and thus convenient to clean.

[0032] In this embodiment, if Figure 1 、 Figure 3 and Figure 5 As shown, the output end of the elevator 15 is connected to a fixing member 25 fixedly connected to the top of the cover plate 12. A sliding hole 26 is formed through the fixing member 25. A sliding rod 27 is fixedly connected to the top of the base plate 1 and cooperates with the sliding hole 26. Two rotating wheels 28 are rotatably mounted on the fixing member 25, one on each side of the sliding rod 27. The setting of the sliding hole 26 and the sliding rod 27 plays a limiting role, preventing the cover plate 12 from deviating when opening and closing. The rotating wheels 28 save effort and protect the sliding rod 27 from wear.

[0033] In this embodiment, if Figure 1 、 Figure 3 and Figure 6 As shown, rotating shafts 30 are symmetrically connected to the outer walls of both sides of the injection tank 8. A rotating sleeve 29 that cooperates with the rotating shaft 30 is fixedly connected to the top of the mounting frame 7. A second motor 31 is fixedly mounted on the mounting frame 7, and the output end of the second motor 31 is interconnected with one of the rotating shafts 30. The provision of the second motor 31 can realize automatic rotation of the injection tank 8, facilitating operation, cleaning, and maintenance.

[0034] In this embodiment, if Figures 1-6 As shown, the working process of a high-temperature RTM injection molding machine provided in this embodiment is as follows:

[0035] Step 1: During the RTM process, the resin is first placed in the preheating tank 11 for stirring and heating. After heating to the target temperature, the material transfer mechanism 4 transfers the resin from the preheating tank 11 to the injection tank 8. At this time, the vacuum mechanism 5 is activated to remove bubbles from the resin.

[0036] Step 2: Use the connecting pipe to connect the injection cylinder 10 and the mold. At the same time, the flexible pipe heating jacket 21 is put on the outside of the connecting pipe. The flexible pipe heating jacket 21 is started to heat. After the connection is completed, the resin injection can be carried out;

[0037] Step 3: After the injection is completed, the connection is released, and the second motor 31 is started to rotate the injection tank 8 90 degrees. The handle 34 is turned to remove the syringe 10. The electric telescopic rod 9 is started to drive the piston head 32 to push out the resin adhering to the outer wall. The piston head 32 is then cleaned. After cleaning, it is rotated 90 degrees to reset, and finally the injection process is ended.

[0038] The above is only a further embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes based on the technical solutions and concepts of the present invention within the scope disclosed by the present invention, which fall within the scope of protection of the present invention.

Claims

1. A high temperature RTM injection molding machine, comprising a base plate (1), characterized in that: The top of the base plate (1) is provided with an injection mechanism (2), a preheating mechanism (3), a material transfer mechanism (4), a vacuum mechanism (5) and a control mechanism (6); the top of the base plate (1) is fixedly connected to a mounting frame (7); the injection mechanism (2) comprises an injection tank (8) rotatably mounted on the mounting frame (7), and an injection cylinder (10) mounted on the top of the injection tank (8); the bottom of the injection tank (8) is provided with an electric telescopic rod (9); the output end of the electric telescopic rod (9) is fixedly connected to a piston head (32) located inside the injection tank (8); a connecting pipeline is installed on the injection cylinder (10); a flexible pipeline heating sleeve (21) is detachably mounted on the outer wall of the connecting pipeline; a heat preservation heater is installed on the injection tank (8); the heating range of the heat preservation heater is 250° C.-300° C.

2. A high temperature RTM injection molding machine as claimed in claim 1, characterized in that: The preheating mechanism (3) comprises a preheating tank (11) and a cover plate (12) movably mounted on the top of the preheating tank (11); a first motor (13) is mounted on the top of the cover plate (12); an output end of the first motor (13) is connected to a stirrer (14) located inside the preheating tank (11); a hoist (15) connected to the cover plate (12) is fixedly mounted on the top of the base plate (1); and a temperature-raising heater is provided on the inside of the preheating tank (11).

3. A high temperature RTM injection molding machine as claimed in claim 2, characterized in that: The material transfer mechanism (4) comprises a feed pump (16), the input end of the feed pump (16) is connected to the preheating tank (11) via an input hose (17), and the output end of the feed pump (16) is connected to the injection tank (8) via an output hose (18), and the feed pump (16) is a metering pump.

4. A high temperature RTM injection molding machine as claimed in claim 1, characterized in that: The vacuum mechanism (5) comprises a vacuum pump (19) and a resin collecting tank (20) mounted on the base plate (1).

5. A high temperature RTM injection molding machine as claimed in claim 2, characterized in that: A first heat-insulating shell (22) is installed on the outer wall of the injection tank (8), a second heat-insulating shell (23) located outside the preheating mechanism (3) is fixedly installed on the top of the base plate (1), and a lock (24) cooperating with the cover plate (12) is movably installed on the outer wall of the preheating tank (11).

6. A high temperature RTM injection molding machine as claimed in claim 1, characterized in that: The bottom end of the injection cylinder (10) is fixedly connected to a connecting cap (33) threadedly connected to the injection tank (8); a valve is installed on the injection cylinder (10); and a handle (34) is installed on the outer wall of the connecting cap (33).

7. A high temperature RTM injection molding machine as claimed in claim 2, characterized in that: The output end of the elevator (15) is connected to a fixing member (25) fixedly connected to the top of the cover plate (12), a sliding hole (26) is penetrated through the fixing member (25), and the top of the base plate (1) is fixedly connected to a sliding rod (27) matched with the sliding hole (26).

8. A high temperature RTM injection molding machine as claimed in claim 7, characterized in that: The fixing member (25) is rotatably mounted with two rotating wheels (28) respectively located on both sides of the sliding rod (27).

9. A high temperature RTM injection molding machine as claimed in claim 1, characterized in that: The outer walls on both sides of the injection tank (8) are symmetrically connected with rotating shafts (30), and the top of the mounting frame (7) is fixedly connected with a rotating sleeve (29) that matches the rotating shafts (30).

10. A high temperature RTM injection molding machine as claimed in claim 9, characterized in that: A second motor (31) is fixedly mounted on the mounting frame (7), and an output end of the second motor (31) is interconnected with one of the rotating shafts (30).

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