Hot press molding process and equipment for polytetrafluoroethylene lining on inner wall of chemical storage tank

Abstract

The invention discloses a hot-press forming process and equipment for a tetrafluoro lining on the inner wall of a chemical storage tank. The hot-press forming process comprises the following specific steps that S1, a mold is designed, specifically, a lower mold in a hot-press forming mold is split to form an independent inner layer, and the inner layer is partially attached to the inner wall of the tetrafluoro lining; s2, raw material preparation: taking polytetrafluoroethylene as a raw material, and mixing with a filler and a modifier; s3, performing: filling a mold with the powdery raw materials, and pressing the powdery raw materials into a primary shape through a press machine; s4, hot press molding is conducted, specifically, a semi-finished product obtained after preliminary molding is transferred into hot press molding equipment, and the required polytetrafluoroethylene lining shape is manufactured at a certain temperature and pressure; s5, cooling and shaping; s6, demolding and post-treatment are conducted; the hot press molding process and equipment for the tetrafluoro lining of the inner wall of the chemical storage tank have the effects that the deformation probability of the tetrafluoro lining in the heat dissipation process is reduced, meanwhile, the time needed by natural cooling can be shortened, and the production efficiency of the tetrafluoro lining is optimized.

Description

Technical Field

[0001] The present invention relates to the technical field of hot pressing forming, and particularly to a hot pressing forming process and equipment for a tetrafluoro lining on the inner wall of a chemical storage tank. Background Art

[0002] The main functions of the tetrafluoro lining (polytetrafluoroethylene PTFE lining) include improving the corrosion resistance, wear resistance, high-temperature resistance of the equipment, and enhancing the insulation performance of the equipment, thereby extending the service life of the equipment.

[0003] During the production process of the tetrafluoro lining, it is necessary to use hot pressing forming equipment to shape it under a certain pressure and temperature. In order to ensure the stability of the shape of the tetrafluoro lining after hot pressing, it is generally necessary to cool it naturally in the mold to room temperature before it can be removed. However, since the entire natural cooling process may take one to two hours, the production efficiency cannot be improved.

[0004] In order to optimize the production efficiency, a water cooling structure is adopted in the hot pressing forming equipment to cool the mold and the internal materials. However, the alternating use of the water cooling structure and the heating structure may reduce the service life of the mold and related structures, resulting in a large amount of cost expenditure. Summary of the Invention

[0005] The present invention discloses a hot pressing forming process and equipment for a tetrafluoro lining on the inner wall of a chemical storage tank, aiming to solve the technical problems that the natural cooling process may take one to two hours, resulting in the inability to improve the production efficiency, and if a water cooling structure is used to accelerate the cooling, the alternating use of the water cooling structure and the heating structure may reduce the service life of the mold and related structures, resulting in a large amount of cost expenditure.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A hot pressing forming process for a tetrafluoro lining on the inner wall of a chemical storage tank includes the following specific steps:

[0008] S1: Mold design: The lower mold in the hot pressing forming mold is disassembled to form an independent inner layer, and this inner layer is attached to the inner wall part of the tetrafluoro lining.

[0009] S2: Raw material preparation: Using polytetrafluoroethylene as the raw material, and mixing it with a filler and a modifier.

[0010] S3: Pre-forming: Filling the powdery raw material into the mold, and pressing it into a preliminary shape by a press.

[0011] S4: Hot pressing forming: Transferring the preliminarily formed semi-finished product to the hot pressing forming equipment, and forming it into the required shape of the tetrafluoro lining under a certain temperature and pressure.

[0012] S5: Cooling and shaping: After hot pressing, it is naturally cooled in the mold for 30 minutes. Then, the upper mold is connected, and a part of the lower mold is separated. After mold opening, the PTFE lining is clamped and lifted by both of them, and the bottom of the PTFE lining is cooled by flowing air.

[0013] S6: Demolding and post-treatment: After heat dissipation, the PTFE lining is removed, and its inner and outer walls are polished.

[0014] A hot pressing forming device for the inner wall PTFE lining of a chemical storage tank, including a lower mold mounting frame. The top of the lower mold mounting frame is equipped with a lower mold, and a first groove is provided on the outer wall of the lower mold. The bottom of the lower mold mounting frame is fixedly connected with a base, and a heat dissipation mechanism is arranged around the outer periphery of the lower mold mounting frame.

[0015] The auxiliary positioning mechanism includes a support frame located in the first groove. The outer wall of the support frame and the outer wall of the lower mold form a complete curved surface.

[0016] Both sides of the support frame are respectively fixedly connected with cross plates, and hanging brackets are respectively fixedly connected to the opposite outer walls of the two cross plates. Each hanging bracket is respectively clamped with a hook, and the tops of multiple hooks are respectively fixedly connected with side support plates. The tops of multiple side support plates are simultaneously connected with a C-shaped support plate through damping hinges.

[0017] The top outer wall of the lower mold mounting frame is simultaneously fixedly connected with multiple first vertical rods, and the tops of multiple first vertical rods are simultaneously connected with a top seat. An upper mold mounting frame is movably sleeved on multiple first vertical rods, and an upper mold is installed at the bottom end of the upper mold mounting frame. The top of the upper mold mounting frame is connected with a hydraulic cylinder, and the hydraulic rod is installed on the top seat.

[0018] The inner wall of the top of the C-shaped support plate is fixedly connected with a first air rod, and the first air rod is installed on the upper mold mounting frame. The top outer wall of the upper mold mounting frame is fixedly connected with multiple limit insertion rods, and multiple limit insertion rods are movably inserted into the C-shaped support plate.

[0019] By setting an auxiliary positioning mechanism, during demolding, the hook can be inserted into the hanging bracket, and then the hook and the hanging bracket are completely clamped under the activation of the first air rod. Thus, after a certain degree of shaping of the PTFE lining, as the upper mold is lifted, the support frame is also lifted accordingly. The PTFE lining can be driven to lift by the clamping of the upper mold and the support frame, and then heat dissipation can be completed by the action of the heat dissipation mechanism on the bottom end of the PTFE lining. During the entire heat dissipation process, the inner wall of the PTFE lining can be supported by the upper mold to reduce the deformation probability of the PTFE lining during heat dissipation. At the same time, the time required for natural cooling can also be shortened, optimizing the production efficiency of the PTFE lining. Moreover, the side support plates can be turned up and stored on one side of the C-shaped support plate to avoid obstruction during the feeding process. At the same time, when using molds of different thicknesses, the telescopic distance of the first air rod can be adjusted to connect the hook with hanging brackets at different heights, with higher adaptability.

[0020] In a preferred embodiment, the heat dissipation mechanism includes a plurality of second vertical rods fixedly connected to the top end of the base, and each second vertical rod is movably sleeved with a sleeve. The plurality of sleeves are fixedly connected to a square frame at the same time, and a plurality of fans are installed around the inner wall of the square frame.

[0021] On the opposite outer walls of the base, second grooves are respectively provided, and at the bottom inner wall of each second groove, a double-headed air rod is fixedly connected. The two output ends of the double-headed air rod are respectively fixedly connected to a hinge plate, and the top ends of the hinge plates are respectively hinged with a connecting rod.

[0022] The top ends of each group of two connecting rods are hinged to each other, and a connecting plate is movably connected at the hinged part. The connecting plate is fixedly connected to the outer wall of the square frame.

[0023] By providing a heat dissipation mechanism, in the heat dissipation mechanism, the square frame can be pushed to move upward along the plurality of second vertical rods until it moves above the lower mold mounting frame, thereby dissipating heat from the bottom of the lifted PTFE lining. At the same time, based on the setting of this structure, the height of the fan can also be changed by lifting and lowering, and it can be stored at the bottom when heat dissipation is not required, without blocking the feeding of materials.

[0024] As can be seen from the above, a hot pressing forming process for the inner wall PTFE lining of a chemical storage tank includes the following specific steps: S1: Mold design: The lower mold in the hot pressing forming mold is disassembled to form an independent inner layer, and this inner layer is partially attached to the inner wall of the PTFE lining; S2: Raw material preparation: Using polytetrafluoroethylene as the raw material, it is mixed with a filler and a modifier; S3: Pre-forming: The powdered raw material is filled into the mold and pressed into a preliminary shape by a press; S4: Hot pressing forming: The semi-finished product in the preliminary shape is transferred to a hot pressing forming device and formed into the required PTFE lining shape under certain temperature and pressure; S5: Cooling and shaping: After hot pressing, it is naturally cooled in the mold for 30 minutes, then the upper mold is connected to the separated part of the lower mold, and after the mold is opened, the PTFE lining is clamped and lifted by the two, and the bottom of the PTFE lining is dissipated by flowing air; S6: Demolding and post-treatment: After heat dissipation, the PTFE lining is removed, and its inner and outer walls are polished. The hot pressing forming process and equipment for the inner wall PTFE lining of a chemical storage tank provided by the present invention have the technical effects of reducing the deformation probability of the PTFE lining during heat dissipation and shortening the required time for natural cooling, and optimizing the production efficiency of the PTFE lining. Description of the Drawings

[0025] Figure 1 It is a schematic diagram of the overall structure of a hot pressing forming process for the inner wall PTFE lining of a chemical storage tank proposed by the present invention.

[0026] Figure 2Schematic diagram of the overall structure of a hot pressing forming device for a tetrafluoro lining on the inner wall of a chemical storage tank proposed by the present invention.

[0027] Figure 3 Schematic diagram of the disassembly of the auxiliary positioning mechanism of a hot pressing forming device for a tetrafluoro lining on the inner wall of a chemical storage tank proposed by the present invention.

[0028] Figure 4 The upper mold and lower mold of a tetrafluoro lining on the inner wall of a chemical storage tank proposed by the present invention.

[0029] Schematic diagram of the disassembly of the connection structure.

[0030] Figure 5 Schematic diagram of the heat dissipation mechanism of a tetrafluoro lining on the inner wall of a chemical storage tank proposed by the present invention.

[0031] In the figure: 1. Hydraulic cylinder; 2. Top seat; 3. Upper mold mounting frame; 4. Heat dissipation mechanism; 5. Base; 6. Lower mold mounting frame; 7. Auxiliary positioning mechanism; 8. First vertical rod; 9. Upper mold; 10. First groove; 11. Lower mold; 401. Second vertical rod; 402. Square frame; 403. Sleeve; 404. Fan; 405. Second groove; 406. Double-headed air rod; 407. Connecting rod; 408. Hinge plate; 409. Connecting plate; 701. C-shaped support plate; 702. First air rod; 703. Limit insertion rod; 704. Side support plate; 705. Hook; 706. Hanging frame; 707. Horizontal plate; 708. Bracket. Specific embodiments

[0032] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0033] A hot pressing forming process and device for a tetrafluoro lining on the inner wall of a chemical storage tank disclosed by the present invention are mainly applied to the scenario of hot pressing forming of the tetrafluoro lining.

[0034] Refer to Figure 1 , a hot pressing forming process for a tetrafluoro lining on the inner wall of a chemical storage tank, including the following specific steps:

[0035] S1: Mold design: The lower mold in the hot pressing forming mold is disassembled to form an independent inner layer, and this inner layer is partially attached to the inner wall of the tetrafluoro lining;

[0036] S2: Raw material preparation: Using polytetrafluoroethylene as the raw material, mixing with fillers and modifiers;

[0037] S3: Pre-forming: Filling the powdery raw material into the mold and pressing it into a preliminary shape by a press;

[0038] S4: Hot pressing forming: Transfer the semi-finished product after preliminary forming to the hot pressing forming equipment, and form the required Teflon lining shape under certain temperature and pressure;

[0039] S5: Cooling and shaping: After the hot pressing is completed, naturally cool in the mold for 30 minutes, then connect the upper mold and the split part of the lower mold. After opening the mold, clamp and lift the Teflon lining through both of them, and use flowing air to dissipate heat from the bottom of the Teflon lining;

[0040] S6: Demoulding and post-treatment: After the heat dissipation is completed, remove the Teflon lining and polish its inner and outer walls.

[0041] Refer to Figures 2 - 4 A hot pressing forming equipment for the inner wall Teflon lining of a chemical storage tank, including a lower mold mounting frame 6. The top of the lower mold mounting frame 6 is installed with a lower mold 11, and a first groove 10 is arranged on the outer wall of the lower mold 11. The bottom of the lower mold mounting frame 6 is fixedly connected with a base 5, and a heat dissipation mechanism 4 is arranged around the outer periphery of the lower mold mounting frame 6;

[0042] The auxiliary positioning mechanism 7 includes a support frame 708, and the support frame 708 is located in the first groove 10. The outer wall of the support frame 708 and the outer wall of the lower mold 11 form a complete curved surface.

[0043] Refer to Figure 3 And Figure 4 In a preferred embodiment, cross plates 707 are respectively fixedly connected to both sides of the support frame 708, and hanging frames 706 are respectively fixedly connected to the opposite outer walls of the two cross plates 707. Hooks 705 are respectively clamped in each hanging frame 706, and side support plates 704 are respectively fixedly connected to the tops of the multiple hooks 705. The tops of the multiple side support plates 704 are simultaneously connected to a C-shaped support plate 701 through damping hinges.

[0044] Refer to Figure 3 And Figure 4 In a preferred embodiment, multiple first vertical rods 8 are simultaneously fixedly connected to the top outer wall of the lower mold mounting frame 6, and a top seat 2 is simultaneously connected to the tops of the multiple first vertical rods 8. An upper mold mounting frame 3 is movably sleeved on the multiple first vertical rods 8, and an upper mold 9 is installed at the bottom of the upper mold mounting frame 3. A hydraulic cylinder 1 is connected to the top of the upper mold mounting frame 3, and the hydraulic rod 1 is installed on the top seat 2.

[0045] Refer to Figure 3 And Figure 4, in a preferred embodiment, a pneumatic rod one 702 is fixedly connected to the inner wall of the top end of the C-shaped support plate 701, and the pneumatic rod one 702 is installed on the upper die mounting frame 3. A plurality of limiting insertion rods 703 are fixedly connected to the outer wall of the top end of the upper die mounting frame 3, and the plurality of limiting insertion rods 703 are movably inserted into the C-shaped support plate 701. Among them, the support frame 708 is embedded in the first groove 10, and its outer wall and the outer wall of the lower die 11 form a complete arc surface, and this arc surface fits the inner wall of the PTFE lining. Thus, when demolding, the hook 705 can be inserted into the hanging frame 706, and then driven by the activation of the pneumatic rod one 702, the hook 705 moves upward and is completely clamped to the inner wall of the top end of the hanging frame 706. Thus, after a short period of natural cooling to shape the PTFE lining to a certain extent, as the upper die 9 is lifted, the support frame 708 is also lifted accordingly. By the clamping of the upper die 9 and the support frame 708, the PTFE lining can be driven to move upward, with its top end fitting the inner wall of the upper die 9 and its bottom end portion fitting the outer wall of the support frame 708. At this time, by the action of the heat dissipation mechanism 4 on the bottom end of the PTFE lining, heat dissipation can be completed. During the entire heat dissipation process, the inner wall of the PTFE lining can be supported by the upper die 9 to reduce the deformation probability of the PTFE lining during heat dissipation, and at the same time, the time required for natural cooling can also be shortened, optimizing the production efficiency of the PTFE lining. And based on the fact that the side support plate 704 and the C-shaped support plate 701 are connected by a damping hinge, the side support plate 704 can be turned up and stored on one side of the C-shaped support plate 701, which can avoid obstruction during the feeding process. At the same time, when using molds of different thicknesses, the telescopic distance of the pneumatic rod one 702 can be adjusted to connect the hook 705 with the hanging frame 706 at different heights, having higher adaptability.

[0046] Refer to Figure 5 , in a preferred embodiment, the heat dissipation mechanism 4 includes a plurality of second vertical rods 401 fixedly connected to the top end of the base 5, and a sleeve 403 is movably sleeved on each second vertical rod 401. The plurality of sleeves 403 are fixedly connected to a square frame 402 at the same time, and a plurality of fans 404 are installed around the inner wall of the square frame 402.

[0047] Refer to Figure 5 , in a preferred embodiment, second grooves 405 are respectively provided on the opposite outer walls of the base 5, and a double-headed pneumatic rod 406 is fixedly connected to the inner wall of the bottom end of each second groove 405. The two output ends of the double-headed pneumatic rod 406 are respectively fixedly connected to a hinge plate 408, and a connecting rod 407 is respectively hinged to the top end of the hinge plate 408.

[0048] Refer to Figure 5, in a preferred embodiment, the tops of two connecting rods 407 in each group are hinged to each other, and a connecting plate 409 is movably connected to the hinged portion. The connecting plate 409 is fixedly connected to the outer wall of the square frame 402. In the heat dissipation mechanism 4, by the two-way retraction of the double-headed air rod 406, the distance between the two hinge plates 408 on each side can be driven to decrease. At the same time, by restricting the lateral movement of the hinged portion of the connecting rod 407 through the connecting plate 409, the square frame 402 can be pushed to move upward along the plurality of second vertical rods 401 until it moves above the lower die mounting frame 6, thereby dissipating heat from the bottom of the lifted PTFE lining. At the same time, based on the setting of this structure, the height of the fan 404 can also be changed by lifting, and it can be stored at the bottom when heat dissipation is not required, without blocking the feeding of materials.

[0049] Working principle: Among them, the support frame 708 is embedded in the first groove 10, and its outer wall and the outer wall of the lower die 11 form a complete arc surface, which fits against the inner wall of the PTFE lining. Thus, during demolding, the hook 705 can be inserted into the hanging frame 706, and then driven by the activation of the first air rod 702, the hook 705 moves upward and is fully clamped to the inner wall of the top of the hanging frame 706. After a short period of natural cooling to shape the PTFE lining to a certain extent, as the upper die 9 is lifted, the support frame 708 is also lifted accordingly. By clamping the upper die 9 and the support frame 708, the PTFE lining can be driven to move upward, with its top fitting against the inner wall of the upper die 9 and its bottom part fitting against the outer wall of the support frame 708. At this time, heat dissipation can be completed by the action of the heat dissipation mechanism 4 on the bottom end of the PTFE lining. During the entire heat dissipation process, the inner wall of the PTFE lining can be supported by the upper die 9 to reduce the deformation probability of the PTFE lining during heat dissipation, and at the same time, the time required for natural cooling can also be shortened, optimizing the production efficiency of the PTFE lining. And since the side support plate 704 and the C-shaped support plate 701 are connected by a damping hinge, the side support plate 704 can be turned up and stored on one side of the C-shaped support plate 701, which can avoid blocking during the feeding process. At the same time, when using molds of different thicknesses, the telescopic distance of the first air rod 702 can be adjusted to connect the hook 705 to the hanging frame 706 at different heights, with higher adaptability.

[0050] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A hot pressing forming process for the polytetrafluoroethylene lining of the inner wall of a chemical storage tank, characterized in that: The specific steps include: S1: Mold design: split the lower mold in the hot pressing mold to form an independent inner layer, and the inner layer is partially bonded to the inner wall of the PTFE lining; S2: Raw material preparation: polytetrafluoroethylene is used as raw material, mixed with filler and modifier; S3: Preforming: Powdered raw materials are filled into a mold and pressed into a preliminary shape by a press; S4: Hot pressing: The semi-finished product is transferred to the hot pressing equipment to be formed into the required PTFE lining shape under a certain temperature and pressure; S5: Cooling and shaping: After the hot pressing is completed, it is naturally cooled in the mold for 30 minutes, and then the upper mold and the split lower mold are connected. After the mold is opened, the PTFE lining is clamped and lifted by the two, and the flowing air is used to dissipate the heat from the bottom of the PTFE lining; S6: Demolding and post-processing: After the heat dissipation is completed, remove the PTFE lining and polish its inner and outer walls.

2. A hot pressing forming device for the inner wall polytetrafluoroethylene lining of a chemical storage tank, applied to the hot pressing forming process for the inner wall polytetrafluoroethylene lining of a chemical storage tank as claimed in claim 1, comprising a lower die mounting frame (6), characterized in that: A lower die (11) is installed at the top of the lower die mounting frame (6), and a groove (10) is provided on the outer wall of the lower die (11); a base (5) is fixedly connected to the bottom of the lower die mounting frame (6), and a heat dissipation mechanism (4) is provided around the outer periphery of the lower die mounting frame (6); The auxiliary positioning mechanism (7) comprises a support frame (708), and the support frame (708) is located in the groove 1 (10), and the outer wall of the support frame (708) and the outer wall of the lower mold (11) form a complete curved surface.

3. The hot pressing forming equipment for the inner wall polytetrafluoroethylene lining of a chemical storage tank according to claim 2, characterized in that: The two sides of the support frame (708) are respectively fixedly connected with a transverse plate (707), and the outer walls of the two transverse plates (707) facing each other are respectively fixedly connected with a hanger (706), each hanger (706) is respectively clamped with a hook (705), and the top ends of the multiple hooks (705) are respectively fixedly connected with a side support plate (704), and the top ends of the multiple side support plates (704) are simultaneously connected with a C-shaped support plate (701) through a damping hinge.

4. The hot pressing forming equipment for the polytetrafluoroethylene lining of the inner wall of a chemical storage tank according to claim 3 is characterized in that: The top outer wall of the lower die mounting frame (6) is simultaneously fixedly connected to a plurality of vertical rods (8), and the top ends of the plurality of vertical rods (8) are simultaneously connected to a top seat (2); an upper die mounting frame (3) is simultaneously movably sleeved on the plurality of vertical rods (8), and an upper die (9) is installed at the bottom end of the upper die mounting frame (3); the top end of the upper die mounting frame (3) is connected to a hydraulic cylinder (1), and the hydraulic rod (1) is installed on the top seat (2).

5. The hot pressing forming equipment for the polytetrafluoroethylene lining of the inner wall of a chemical storage tank according to claim 4, characterized in that: The top inner wall of the C-shaped support plate (701) is fixedly connected to a gas rod (702), and the gas rod (702) is installed on the upper mold mounting frame (3). The top outer wall of the upper mold mounting frame (3) is fixedly connected to a plurality of limit rods (703), and the plurality of limit rods (703) are movably inserted into the C-shaped support plate (701).

6. The hot pressing forming equipment for the polytetrafluoroethylene lining of the inner wall of a chemical storage tank according to claim 2, characterized in that: The heat dissipation mechanism (4) comprises a plurality of vertical rods (401) fixedly connected to the top of the base (5), and each vertical rod (401) is movably sleeved with a sleeve (403), and the plurality of sleeves (403) are simultaneously fixedly connected to a square frame (402), and a plurality of fans (404) are installed around the inner wall of the square frame (402).

7. The hot pressing forming equipment for the inner wall polytetrafluoroethylene lining of a chemical storage tank according to claim 6, characterized in that: The outer walls on both sides facing each other of the base (5) are respectively provided with grooves 2 (405), and the inner wall at the bottom end of each groove 2 (405) is fixedly connected with a double-headed gas rod (406), and the two output ends of the double-headed gas rod (406) are respectively fixedly connected with hinged plates (408), and the top ends of the hinged plates (408) are respectively hinged with connecting rods (407).

8. The hot pressing forming equipment for the polytetrafluoroethylene lining of the inner wall of a chemical storage tank according to claim 7, characterized in that: The top ends of the two connecting rods (407) in each group are hinged to each other, and a connecting plate (409) is movably connected to the hinge, and the connecting plate (409) is fixedly connected to the outer wall of the square frame (402).

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