A hot-pressing forming process for a four-fluorine lining of an inner wall of a chemical storage tank

Abstract

The application discloses a kind of hot-pressing forming processes of chemical storage tank inner wall tetrafluoro lining, comprising the following specific steps: S1: mold design: the lower mould in hot-pressing forming mould is split, form an independent inner layer, and the inner layer is partially attached with the inner wall of tetrafluoro lining;S2: raw material preparation: with polytetrafluoroethylene as raw material, mixed with filler and modifier;S3: preforming: the powdered raw material is filled into the mould, and is pressed into preliminary shape by press;S4: hot-pressing forming: the semi-finished product of preliminary forming is transferred to hot-pressing forming equipment, and the required tetrafluoro lining shape is made under certain temperature and pressure;S5: cooling and setting;S6: demoulding and post-processing;The hot-pressing forming process and equipment of the chemical storage tank inner wall tetrafluoro lining disclosed by the application can reduce the deformation probability of tetrafluoro lining during the heat dissipation process, shorten the natural cooling time, and optimize the production efficiency of tetrafluoro lining.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hot pressing forming, in particular to a hot pressing forming process for a tetrafluoroethylene lining of an inner wall of a chemical storage tank. BACKGROUND

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

[0003] In the production process of the tetrafluoroethylene lining, hot pressing forming equipment is used to shape the tetrafluoroethylene lining under certain pressure and temperature. In order to ensure the stability of the shape of the tetrafluoroethylene lining after hot pressing, the tetrafluoroethylene lining is generally cooled to room temperature in the mold before being removed. However, the entire natural cooling process may take one to two hours, which may result in a low production efficiency.

[0004] In order to optimize the production efficiency, a water cooling structure is used in the hot pressing forming equipment to cool the mold and the internal material. However, the alternation 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

[0005] The present application discloses a hot pressing forming process for a tetrafluoroethylene lining of an inner wall of a chemical storage tank, which aims to solve the technical problem that the natural cooling process may take one to two hours, which may result in a low production efficiency, and if a water cooling structure is used to accelerate the cooling, the alternation 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-mentioned purpose, the present application adopts the following technical solution:

[0007] A hot pressing forming process for a tetrafluoroethylene lining of an inner wall of a chemical storage tank, comprising the following specific steps:

[0008] S1: mold design: the lower mold in the hot pressing forming mold is split to form an independent inner layer, and the inner layer is attached to the inner wall part of the tetrafluoroethylene lining;

[0009] S2: raw material preparation: polytetrafluoroethylene is used as a raw material, and a filler and a modifier are mixed;

[0010] S3: preforming: the powder-like raw material is filled into the mold, and is pressed into a preliminary shape by a press;

[0011] S4: hot pressing forming: the semi-finished product preliminarily formed is transferred to a hot pressing forming equipment, and is formed into a required tetrafluoroethylene lining shape under certain temperature and pressure;

[0012] S5: cooling and shaping: after the hot pressing is finished, the mold is naturally cooled for 30 minutes, then the upper mold is connected with the separated lower mold, and after the mold is opened, the four-fluorine liner is clamped and lifted by the two, and the bottom of the four-fluorine liner is cooled by flowing air;

[0013] S6: demolding and post-processing: after the cooling is finished, the four-fluorine liner is taken out, and the inner and outer walls thereof are polished.

[0014] A hot-pressing forming equipment for a four-fluorine liner in a chemical storage tank inner wall comprises a lower mold mounting frame, the top end of the lower mold mounting frame is provided with a lower mold, and the outer wall of the lower mold is provided with a groove one, the bottom of the lower mold mounting frame is fixedly connected with a base, and the outer periphery of the lower mold mounting frame is provided with a cooling mechanism;

[0015] The auxiliary positioning mechanism comprises a support frame, and the support frame is located in the groove one, and the outer wall of the support frame and the outer wall of the lower mold form a complete curved surface;

[0016] The two sides of the support frame are respectively fixedly connected with horizontal plates, and the opposite sides of the outer walls of the two horizontal plates are respectively fixedly connected with hangers, each of the hangers is respectively clamped with a hook, the top ends of a plurality of hooks are respectively fixedly connected with side support plates, and the top ends of a plurality of side support plates are simultaneously connected with C-shaped support plates through damping hinges;

[0017] The top end of the outer wall of the lower mold mounting frame is simultaneously fixedly connected with a plurality of vertical rods one, the top ends of the plurality of vertical rods one are simultaneously connected with a top base, a plurality of upper mold mounting frames are movably sleeved on the plurality of vertical rods one, the bottom end of the upper mold mounting frame is provided with an upper mold, the top end of the upper mold mounting frame is connected with a hydraulic cylinder, and the hydraulic cylinder is installed on the top base;

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

[0019] By setting the auxiliary positioning mechanism, when demolding, the hook can be inserted into the hanger, and then the hook and the hanger are completely clamped under the starting of the air rod one, so that after the four-fluorine liner is shaped to a certain extent, the support frame is also lifted up accordingly, and the four-fluorine liner can be lifted up by the clamping of the upper mold and the support frame, and then the bottom end of the four-fluorine liner can be cooled by the cooling mechanism, and during the whole cooling process, the inner wall of the four-fluorine liner can be supported by the upper mold to reduce the deformation probability of the four-fluorine liner during the cooling process, shorten the time required for natural cooling, optimize the production efficiency of the four-fluorine liner, and make the side support plates fold up and be stored on one side of the C-shaped support plate to avoid blocking during the feeding process, and when different thickness molds are used, the extension distance of the air rod one can be adjusted to connect the hook with hangers of different heights, which has higher adaptability.

[0020] In a preferred scheme, the heat dissipation mechanism comprises a plurality of vertical rods two fixedly connected to the top end of the base, and each vertical rod two is movably sleeved with a sleeve, a plurality of the sleeves are fixedly connected with a square frame, and the inner wall of the square frame is surrounded by a plurality of fans;

[0021] The opposite two sides of the base are respectively provided with grooves two, and the bottom end of each groove two is respectively fixedly connected with a double-head air rod, the two output ends of the double-head air rod are respectively fixedly connected with a hinged plate, and the top end of the hinged plate is respectively hinged with a connecting rod;

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

[0023] By setting the heat dissipation mechanism, the square frame can be pushed up along the plurality of vertical rods two until it moves above the lower mold mounting frame, thereby cooling the bottom of the lifted four-fluorine liner, and based on the structure, the fan height can be changed by lifting, and when not needed for cooling, it can be stored in the bottom, without blocking the material loading.

[0024] As can be seen from the above, a hot pressing forming process for a four-fluorine liner on the inner wall of a chemical storage tank comprises the following specific steps: S1: mold design: the lower mold in the hot pressing forming mold is split to form an independent inner layer, and the inner layer is partially attached to the inner wall of the four-fluorine liner; S2: raw material preparation: polytetrafluoroethylene is used as a raw material, mixed with a filler and a modifier; S3: preforming: the powder-like raw material is filled into the mold and pressed into a preliminary shape by a press; S4: hot pressing: the semi-finished product after preliminary forming is transferred to a hot pressing forming equipment to form the required four-fluorine liner shape under certain temperature and pressure; S5: cooling and shaping: after hot pressing, the mold is naturally cooled for 30 minutes, then the upper mold and the split part of the lower mold are connected, and after the mold is opened, the four-fluorine liner is clamped and lifted by the two, and the bottom of the four-fluorine liner is cooled by flowing air; S6: demolding and post-processing: after cooling, the four-fluorine liner is removed, and the inner and outer walls are polished. The hot pressing forming process and equipment for the four-fluorine liner on the inner wall of the chemical storage tank provided by the present application has the technical effect of reducing the deformation probability of the four-fluorine liner during the cooling process, shortening the time required for natural cooling, and optimizing the production efficiency of the four-fluorine liner. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 The overall structure of the hot pressing forming process for the four-fluorine liner on the inner wall of the chemical storage tank is shown.

[0026] Figure 2The overall structural schematic diagram of the hot-press forming equipment for the four-fluorine lining of the inner wall of the chemical storage tank is proposed in the application.

[0027] Figure 3 The auxiliary positioning mechanism split schematic diagram of the hot-press forming equipment for the four-fluorine lining of the inner wall of the chemical storage tank is proposed in the application.

[0028] Figure 4 The upper die and lower die connection structure split schematic diagram of the hot-press forming equipment for the four-fluorine lining of the inner wall of the chemical storage tank is proposed in the application.

[0029] Figure 5 The heat dissipation mechanism structure schematic diagram of the hot-press forming equipment for the four-fluorine lining of the inner wall of the chemical storage tank is proposed in the application.

[0030] In the figure: 1, hydraulic cylinder; 2, top seat; 3, upper die mounting frame; 4, heat dissipation mechanism; 5, base; 6, lower die mounting frame; 7, auxiliary positioning mechanism; 8, vertical rod one; 9, upper die; 10, groove one; 11, lower die; 401, vertical rod two; 402, square frame; 403, sleeve; 404, fan; 405, groove two; 406, double-head air rod; 407, connecting rod; 408, hinged plate; 409, connecting plate; 701, C-shaped support plate; 702, air rod one; 703, limiting plug rod; 704, side support plate; 705, hook; 706, hanging rack; 707, horizontal plate; 708, support rack. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the application will be apparently and completely described below with reference to the drawings in the embodiments of the application, obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application.

[0032] The hot-press forming process for the four-fluorine lining of the inner wall of the chemical storage tank disclosed in the application is mainly applied to the scene of hot-press forming of the four-fluorine lining.

[0033] REFERENCE Figure 1 The hot-press forming process for the four-fluorine lining of the inner wall of the chemical storage tank, comprising the following specific steps:

[0034] S1: mold design: split the lower die in the hot-press forming mold to form an independent inner layer, and the inner layer is attached to the inner wall part of the four-fluorine lining;

[0035] S2: raw material preparation: taking polytetrafluoroethylene as the raw material, mixing with the filler and the modifier;

[0036] S3: preforming: filling the powder-shaped raw material into the mold, and pressing into a preliminary shape through the press;

[0037] S4: hot press forming: the preliminary forming of the semi-finished product is transferred to the hot press forming equipment, and the required four fluorine liner shape is made under certain temperature and pressure;

[0038] S5: cooling and shaping: after the hot pressing is finished, the mold is naturally cooled for 30 minutes, then the upper mold is connected with the separated lower mold, the four fluorine liner is clamped and lifted by the two after the mold is opened, and the bottom of the four fluorine liner is cooled by flowing air;

[0039] S6: demolding and post-processing: after the cooling is finished, the four fluorine liner is taken out, and the inner and outer walls are polished.

[0040] Referring to Figures 2-4 A hot press forming equipment for the inner wall of a chemical storage tank lined with four fluorine, comprising a lower mold mounting frame 6, a lower mold 11 mounted at the top end of the lower mold mounting frame 6, and a groove 10 provided on the outer wall of the lower mold 11, a base 5 fixedly connected to the bottom of the lower mold mounting frame 6, and a heat dissipation mechanism 4 provided around the outer periphery of the lower mold mounting frame 6.

[0041] The auxiliary positioning mechanism 7 comprises a support frame 708, which is located in the groove 10, and the outer wall of the support frame 708 and the outer wall of the lower mold 11 form a complete curved surface.

[0042] Referring to Figure 3 and Figure 4 In a preferred embodiment, the two sides of the support frame 708 are fixedly connected with horizontal plates 707, and the opposite sides of the two horizontal plates 707 are fixedly connected with hangers 706, respectively, a hook 705 is clamped in each hanger 706, respectively, and the top ends of the plurality of hooks 705 are fixedly connected with side plates 704, respectively, and the top ends of the plurality of side plates 704 are connected with C-shaped plates 701 through damping hinges.

[0043] Referring to Figure 3 and Figure 4 In a preferred embodiment, the top end of the lower mold mounting frame 6 is fixedly connected with a plurality of vertical rods 8, respectively, and the top ends of the plurality of vertical rods 8 are connected with a top base 2, respectively, a plurality of upper mold mounting frames 3 are movably sleeved on the plurality of vertical rods 8, respectively, and the bottom end of each upper mold mounting frame 3 is provided with an upper mold 9, the top end of each upper mold mounting frame 3 is connected with a hydraulic cylinder 1, and the hydraulic cylinder 1 is mounted on the top base 2.

[0044] Referring to Figure 3 and Figure 4In a preferred implementation, the inner wall of the top end of the C-shaped support plate 701 is fixedly connected with the air rod one 702, and the air rod one 702 is installed on the upper mold mounting frame 3. The outer wall of the top end of the upper mold mounting frame 3 is fixedly connected with a plurality of limiting insertion rods 703, and the plurality of limiting insertion rods 703 are movably inserted into the C-shaped support plate 701. The support frame 708 is embedded in the groove one 10, and the outer wall thereof and the outer wall of the lower mold 11 form a complete curved surface which is attached to the inner wall of the Teflon liner. Thus, when demolding, the hook 705 can be inserted into the hanging bracket 706, and then the hook 705 is driven to move upward and is completely connected to the top end inner wall of the hanging bracket 706 under the action of the air rod one 702. After a short period of natural cooling, the Teflon liner is partially shaped, and then the support frame 708 is lifted correspondingly as the upper mold 9 is lifted. The Teflon liner is lifted by the clamping of the upper mold 9 and the support frame 708, and the top end thereof is attached to the inner wall of the upper mold 9, and the bottom end thereof is attached to the outer wall of the support frame 708. At this time, the heat dissipation can be completed by the heat dissipation mechanism 4 acting on the bottom end of the Teflon liner. During the entire heat dissipation process, the inner wall of the Teflon liner can be supported by the upper mold 9 to reduce the deformation probability of the Teflon liner during the heat dissipation process, and the time required for natural cooling can be shortened, the production efficiency of the Teflon liner is optimized, and the side support plate 704 and the C-shaped support plate 701 are connected by a damping hinge. Thus, the side support plate 704 can be folded and stored on one side of the C-shaped support plate 701, the blocking during the feeding process can be avoided, and the hook 705 can be connected to the hanging bracket 706 with different heights by adjusting the extension distance of the air rod one 702 when using molds with different thicknesses, which has higher adaptability.

[0045] Referring to Figure 5 In a preferred implementation, the heat dissipation mechanism 4 includes a plurality of vertical rods two 401 fixedly connected to the top end of the base 5, and each vertical rod two 401 is movably sleeved with a sleeve 403. The plurality of sleeves 403 are fixedly connected with a square frame 402, and the inner wall of the square frame 402 is surrounded by a plurality of fans 404.

[0046] Referring to Figure 5 In a preferred implementation, the opposite outer walls of the base 5 are respectively provided with grooves two 405, and the inner wall of the bottom end of each groove two 405 is fixedly connected with a double-head air rod 406. The two output ends of the double-head air rod 406 are respectively fixedly connected with a hinged plate 408, and the top end of the hinged plate 408 is respectively hinged with a connecting rod 407.

[0047] Referring to Figure 5In a preferred embodiment, the top ends of each group of two connecting rods 407 are hingedly connected to each other, and a connecting plate 409 is movably connected at the hinge, and the connecting plate 409 is fixedly connected to the outer wall of the square frame 402. In the heat dissipation mechanism 4, through the bidirectional retraction of the double-headed air rod 406, the distance between the two hinged plates 408 on each side can be reduced, and at the same time, through the transverse movement restriction of the connecting plate 409 at the hinge of the connecting rod 407, the square frame 402 can be pushed to move upwards along the plurality of vertical rods 401 until it moves above the lower mold mounting frame 6, thereby cooling the bottom of the lifted Teflon liner. At the same time, based on the structure, the height of the fan 404 can also be changed by lifting, which is stored at the bottom when not needed for heat dissipation, and does not block the material feeding.

[0048] Working principle: The support frame 708 is embedded in the groove 10, and the outer wall thereof and the outer wall of the lower mold 11 form a complete curved surface, which is fitted to the inner wall of the Teflon liner. Thus, during demolding, the hook 705 can be inserted into the hanger 706, and then the hook 705 is lifted and completely connected to the top inner wall of the hanger 706 under the action of the air rod 702. After a short period of natural cooling, the Teflon liner is partially shaped, and then the support frame 708 is lifted as the upper mold 9 is lifted. The Teflon liner is lifted by the clamping of the upper mold 9 and the support frame 708, and the top end thereof is fitted to the inner wall of the upper mold 9, and the bottom end thereof is fitted to the outer wall of the support frame 708. At this time, the heat dissipation mechanism 4 acts on the bottom of the Teflon liner to complete the heat dissipation. During the entire heat dissipation process, the inner wall of the Teflon liner can be supported by the upper mold 9 to reduce the deformation probability of the Teflon liner during the heat dissipation process, and the time required for natural cooling can be shortened, thereby optimizing the production efficiency of the Teflon liner. Moreover, the side support plate 704 and the C-shaped support plate 701 are connected by a damping hinge, so that the side support plate 704 can be stored on one side of the C-shaped support plate 701 by being flipped up, thereby avoiding blocking during feeding. In addition, when using molds of different thicknesses, the extension distance of the air rod 702 can be adjusted to connect the hook 705 to the hanger 706 of different heights, thereby having higher adaptability.

[0049] The above description is only a preferred embodiment of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can make equivalent replacements or changes within the technical scope disclosed in the present application and according to the technical solutions and inventive concept of the present application, which should be covered within the protection scope of the present application.

Claims

1. A hot-pressing process for PTFE lining of the inner wall of a chemical storage tank, characterized in that, This includes hot pressing equipment and the following specific steps: S1: Mold design: The lower mold in the thermoforming mold is split to form an independent inner layer, and this inner layer is in contact with the inner wall of the PTFE lining. S2: Raw material preparation: Polytetrafluoroethylene is used as raw material, and it is mixed with fillers and modifiers; S3: Pre-forming: Powdered raw materials are filled into a mold and pressed into a preliminary shape using a press. S4: Hot pressing: The semi-finished product is transferred to a hot pressing machine and formed into the required PTFE lining shape under certain temperature and pressure. S5: Cooling and Shaping: After hot pressing, the mold is allowed to cool naturally for 30 minutes. Then, the upper mold is connected to the separated lower mold. After the mold is opened, the PTFE liner is clamped and raised by the two molds, and the bottom of the PTFE liner is cooled by the flow of air. S6: Demolding and post-processing: After heat dissipation, remove the PTFE lining and polish its inner and outer walls; The hot pressing molding equipment includes a lower mold mounting frame (6), characterized in that a lower mold (11) is mounted on the top of the lower mold mounting frame (6), and a groove (10) is provided on the outer wall of the lower mold (11), a base (5) is fixedly connected to the bottom of the lower mold mounting frame (6), and a heat dissipation mechanism (4) is provided around the outer periphery of the lower mold mounting frame (6). The auxiliary positioning mechanism (7) includes a support (708), and the support (708) is located in the groove (10). The outer wall of the support (708) and the outer wall of the lower mold (11) form a complete curved surface. The support frame (708) is fixedly connected to two horizontal plates (707) on both sides, and the outer walls of the two horizontal plates (707) on opposite sides are fixedly connected to hangers (706). Each hanger (706) is fitted with a hook (705), and the top of the multiple hooks (705) is fixedly connected to a side support plate (704). The top of the multiple side support plates (704) is simultaneously connected to a C-shaped support plate (701) through a damping hinge. The top outer wall of the lower mold mounting bracket (6) is simultaneously fixedly connected with multiple vertical rods (8), and the top of the multiple vertical rods (8) is simultaneously connected with a top seat (2). The upper mold mounting bracket (3) is simultaneously movably sleeved on the multiple vertical rods (8), and the bottom of the upper mold mounting bracket (3) is equipped with an upper mold (9). The top of the upper mold mounting bracket (3) is connected with a hydraulic cylinder (1), and the hydraulic cylinder (1) is installed on the top seat (2). The top inner wall of the C-shaped support plate (701) is fixedly connected to a pneumatic rod (702), and the pneumatic 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 multiple limiting rods (703), and the multiple limiting rods (703) are movably inserted into the C-shaped support plate (701).

2. The hot pressing forming process for a PTFE lining of the inner wall of a chemical storage tank according to claim 1, characterized in that, The heat dissipation mechanism (4) includes multiple vertical rods (401) fixedly connected to the top of the base (5), and each vertical rod (401) is movably sleeved with a sleeve (403). The multiple sleeves (403) are simultaneously fixedly connected to a square frame (402), and multiple fans (404) are installed around the inner wall of the square frame (402).

3. The hot pressing forming process for a PTFE lining of the inner wall of a chemical storage tank according to claim 2, characterized in that, The outer walls of the opposite sides of the base (5) are respectively provided with grooves (405), and the bottom inner wall of each groove (405) is fixedly connected with a double-headed air rod (406). The two output ends of the double-headed air rod (406) are respectively fixedly connected with hinge plates (408), and the top of the hinge plates (408) is respectively hinged with connecting rods (407).

4. The hot pressing forming process for a PTFE lining of the inner wall of a chemical storage tank according to claim 3, 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. The connecting plate (409) is fixedly connected to the outer wall of the square frame (402).

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