Tube sheet PFA lining hot melt column push mold pressing mold and integral mold pressing PFA lining process

Abstract

The application provides a tube plate lining PFA hot melting column push mold pressing mold and a whole mold lining PFA process, wherein the whole mold heating, heat preservation and cooling temperature control process of the application is used to melt, fully flow and better fill PFA particle powder in the mold, the tube plate is pressed by the whole mold pressing, the upper and lower molds have high whole mold pressing strength, the molding is stable, the mold pressing is well filled, the outer surface has high flatness and smoothness, and the whole mold lining PFA process is used to heat and press the mold with the installed tube plate part steel body and the filled material according to the temperature control process in a high-temperature furnace for a certain time, so that the PFA particle powder in the mold is melted, flows and fills the mold and the lining PFA inner cavity, air and part of the melted PFA liquid are discharged, and then the mold is opened to take out the tube plate after lining PFA, the mold and the process have a sealed and clean PFA space, the cleanliness of the formed tube plate reaches the G5 level, the corrosion resistance is high, and the application standard is suitable for the electronic pole industry.

Description

Technical Field

[0001] This invention belongs to the field of PFA-lined tube sheet production technology, and particularly relates to a hot melt column push-molding mold for PFA-lined tube sheets and an integral molding process for PFA lining. Background Technology

[0002] The hot-melt push-molding mold and integral molding process for PFA-lined tube sheets can be implemented in heat exchangers, reaction tower sections and other equipment in high-end pharmaceutical, chemical, food, electronics and new energy industries. It is compatible with various tube sheet and mesh specifications and high-end electronic-grade requirements for PFA lining.

[0003] Existing traditional lining molds and processes can only produce tube sheets lined with fluoropolymer (PF) of grade G3 or lower. The production process suffers from low molding efficiency, difficult demolding, poor quality, rough appearance, and poor cleanliness. Domestically produced molds and processes for tube sheets suitable for large-scale, high-end pharmaceutical, chemical, food, electronics, and new energy industries, such as heat exchangers and reaction tower sections, still need improvement. Therefore, this invention proposes a hot-melt column push-molding mold and an integral molding process for PFA lining to solve the above problems. Summary of the Invention

[0004] This invention provides a hot-melt column push-molding mold for tube sheets lined with PFA and an integral molding process for PFA lining. This hot-melt column push-molding mold for tube sheets lined with PFA and the integral molding process for PFA lining solve the application requirements of various tube sheet and mesh specifications and high electronic grade PFA lining in heat exchangers, reaction tower sections and other equipment in high-end pharmaceutical, chemical, food, electronics, new energy and other industries. It also solves the problems of low molding efficiency, difficult demolding, poor quality, rough appearance and poor cleanliness in the traditional lining production process.

[0005] The present invention is implemented as follows: a tube sheet liner PFA hot melt column push mold, comprising an injection mold core, an upper mold, a lower guide mold and a tube sheet component steel body;

[0006] The upper mold is provided with a filler guide sleeve, a limiting step, and a molding cavity. The injection mold core is housed inside the filler guide sleeve and can move up and down inside the filler guide sleeve to achieve the purpose of pushing and pressing the mold. The lower guide mold is provided with an exhaust groove, a through hole, a limiting step, and a molding cavity. The tube sheet component steel body is provided with an annular groove and a pipe network inner hole. The upper mold and the lower guide mold are fixedly connected by thickened nuts and double-ended bolts. The tube sheet component steel body is located between the upper mold and the lower guide mold. The tube sheet component steel body is limited and installed by the annular groove cooperating with the limiting step on the upper mold and the lower guide mold. The upper surface of the tube sheet component steel body is connected to the molding cavity of the upper mold, and the lower surface is connected to the molding cavity of the lower guide mold.

[0007] The through hole and the inner hole of the pipeline are coaxial and interconnected. A first inner guide post is fixed inside one of the through holes and the inner hole of the pipeline by nuts and hexagonal bolts. A second inner guide post is fixed inside the other through hole and the inner hole of the pipeline by nuts and hexagonal bolts. The steel body of the tube sheet component forms a complete PFA mold liner cavity with the injection mold core, the upper mold, the lower guide mold, the first inner guide post, and the second inner guide post.

[0008] Preferably, the connection between the annular groove and the limiting step on the upper mold and the lower guide mold is provided with a reinforced sealing structure.

[0009] Preferably, the first inner guide post and the second inner guide post are provided with a tapered corner structure, and the tapered corner structure and all the inner holes of the tube network in the tube sheet part steel body form the inner cavity of the tube sheet mesh molding.

[0010] Preferably, the inner bore of the pipeline has a stepped structure, and the stepped structure of the inner bore matches the conical angle structure of the first inner guide post and the second inner guide post.

[0011] Preferably, the vent slot is used to discharge air and partially melted PFA liquid.

[0012] Preferably, the PFA cavity of the mold liner is used to fill PFA granular powder.

[0013] A process for integral molding of PFA lining with a hot-melt column push-molding die for tube sheet lining includes the following steps:

[0014] S1: Before using the tube sheet hot melt column push mold to close the mold, first install and fix the first inner guide column and the second inner guide column on the lower guide mold with nuts and hex bolts, and then fill the molding cavity located at the lower guide mold with PFA granular powder.

[0015] S2: Place and limit the steel body of the tube sheet component between the upper mold and the lower guide mold. After filling the molding cavity located in the upper mold with PFA granules, fill the filler guide sleeve in the upper mold with PFA granules. Tighten the upper mold and the lower guide mold with double-headed bolts and thickened nuts to close the mold.

[0016] S3: Then, the injection mold core is inserted into the upper mold, so that the steel body of the tube sheet part and the injection mold core, upper mold, lower guide mold, first inner guide post and second inner guide post form a complete mold liner PFA inner cavity. The injection mold core moves up and down to achieve the purpose of pushing and pressing the mold.

[0017] S4: The PFA liner cavity of the mold liner after the upper mold and lower guide mold of the steel body of the tube sheet component are closed is heated and pressurized in a high-temperature furnace, so that the PFA granules in the PFA liner cavity melt, flow, and fill the PFA liner cavity, and discharge excess air and melted PFA liquid.

[0018] S5: Hold the temperature in the range of 250-300℃ for 10-15 minutes, then cool it down to below 60℃ and open the mold. Take out the tube sheet lined with PFA, cut off the excess PFA material from the vent, and obtain the tube sheet lined with PFA.

[0019] Preferably, in step S4, the heating temperature is 300-350℃, the pressurization pressure is 6-10MPA, and the heating and pressurization time is 15-20min.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] The tube sheet component steel body of this invention is provided with a reinforcing process annular groove and a stepped process pipeline inner hole. The upper mold is provided with a filler guide sleeve, a limiting step, and a molding cavity. The filler guide sleeve is provided with an injection mold core, which can move up and down within the filler guide sleeve to push and press the mold. The lower guide mold is provided with an exhaust groove, a through hole for installing the first and second inner guide pillars, and a limiting step and molding cavity. The tube sheet component steel body is limited and installed by cooperating with the limiting step on the upper mold and the lower guide mold through the annular groove. The upper surface of the component body is connected to the molding cavity of the upper mold, and the lower surface is connected to the molding cavity of the lower guide mold. The overall mold heating, heat preservation, and cooling temperature control process allows the PFA granules in the mold to melt, flow fully, and fill better. The tube sheet is molded as a whole, and the overall molding strength of the upper and lower molds is high, resulting in stable molding, good molding filling, and high surface flatness and smoothness. This mold and process are PFA-lined in a sealed and clean space. After the tube sheet is formed, the cleanliness reaches the G5 level, and it has strong corrosion resistance, making it suitable for the application standards of the electronic electrode industry.

[0022] 2. The first and second inner guide pillars of the present invention have a tapered structure and form a tube sheet mesh molding cavity with all the stepped holes in the tube sheet steel body, so that the tube sheet mesh lining is uniform, easy to demold, and the tube sheet mesh lining has high molding quality and beautiful appearance.

[0023] 3. The integral molding process of PFA lining of the present invention involves heating and pressurizing the mold, after filling the steel body of the tube sheet component, in a high-temperature furnace according to the temperature control process for a certain period of time. This allows the PFA granules in the mold to melt, flow, and fill the inner cavity of the mold and the steel body of the tube sheet component. Air and some of the melted PFA liquid are discharged. After heating, heat preservation, and cooling temperature control processes, the mold is opened, the tube sheet with PFA lining is removed, and the excess material at the vent is cut off to complete the PFA lining process. No additional shaping and polishing operations are required, which solves the problems of low molding efficiency, difficult demolding, poor quality, rough appearance, and poor cleanliness in the traditional inner lining production process. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of the PFA hot melt column push mold of the present invention;

[0025] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0026] Figure 3 for Figure 1 Enlarged view of section B in the middle.

[0027] In the picture:

[0028] 1. Injection mold core; 2. Upper mold; 3. Lower guide mold; 4. First inner guide post; 5. Second inner guide post; 6. Nut; 7. Hex bolt; 8. Thickened nut; 9. Double-ended bolt; 10. Tube sheet steel body; 11. Filler guide sleeve; 12. Limiting step; 13. Molding cavity; 14. Venting groove; 15. Through hole; 16. Annular groove; 17. Inner hole of the pipeline network. Detailed Implementation

[0029] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0030] The components of the embodiments of the invention described and shown in the accompanying drawings can typically be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention.

[0031] Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0033] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0034] Please see Figures 1 to 3 This invention provides a technical solution: a hot-melt column push-molding mold for tube sheet liners (PFA) and an integral molding process for PFA lining, comprising an injection core 1, an upper mold 2, a lower guide mold 3, and a tube sheet component steel body 10; the upper mold 2 is provided with a filler guide sleeve 11, a limiting step 12, and a molding cavity 13, the injection core 1 is housed inside the filler guide sleeve 11, and the injection core 1 can move up and down inside the filler guide sleeve 11 to achieve the purpose of pushing and pressing the mold; the lower guide mold 3 is provided with an exhaust groove 14, a through hole 15, a limiting step 12, and a molding cavity 13; the tube sheet component steel body 10 is provided with an annular groove 16 and a pipe network inner hole 17; the upper mold 2 and the lower guide mold 3 are fixedly connected by a thickened nut 8 and a double-ended bolt 9; the tube sheet component steel body 10 is provided with... Between the upper mold 2 and the lower guide mold 3, the tube sheet component steel body 10 is installed in a limited position by the annular groove 16 and the limiting step 12 on the upper mold 2 and the lower guide mold 3. The upper surface of the tube sheet component steel body 10 is connected to the molding cavity 13 of the upper mold 2, and the lower surface is connected to the molding cavity 13 of the lower guide mold 3. The through hole 15 and the inner hole 17 of the pipeline are coaxial and interconnected. A first inner guide post 4 is fixed inside one through hole 15 and the inner hole 17 of the pipeline by a nut 6 and a hexagonal bolt 7. A second inner guide post 5 is fixed inside the other through hole 15 and the inner hole 17 of the pipeline by a nut 6 and a hexagonal bolt 7. The tube sheet component steel body 10, the injection mold core 1, the upper mold 2, the lower guide mold 3, the first inner guide post 4, and the second inner guide post 5 form a complete mold liner PFA inner cavity.

[0035] In this embodiment, the hot melt column push-molding die includes an injection core 1, an upper die 2, a lower guide die 3, a first inner guide post 4, a second inner guide post 5, and a tube sheet component steel body 10. The tube sheet component steel body 10 is provided with a reinforcing process annular groove 16 and a stepped process pipeline inner hole 17. The upper die 2 is provided with a filler guide sleeve 11, a limiting step 12, and a molding cavity 13. The filler guide sleeve 11 is provided with an injection core 1 inside, which can move up and down within the filler guide sleeve 11 to push and press the die. The lower guide die 3 is provided with an exhaust groove 14, a through hole 15 for installing the first inner guide post 4 and the second inner guide post 5, and a limiting step 12 and a molding cavity 13. The tube sheet component steel body 10 is limited and installed by cooperating with the limiting step 12 on the upper die 2 and the lower guide die 3 through the annular groove 16. The upper surface of the steel body 10 is connected to the molding cavity 13 of the upper mold 2, and the lower surface is connected to the molding cavity 13 of the lower guide mold 3. The steel body 10 of the tube sheet part forms a complete PFA inner cavity with the injection mold core 1, the upper mold 2, the lower guide mold 3, the first inner guide post 4, and the second inner guide post 5. The filler guide sleeve 11 and the molding cavity 13 are used to fill PFA granules. The overall mold heating, heat preservation, and cooling temperature control process allows the PFA granules in the mold to melt, flow fully, and fill better. The tube sheet is integrally molded, and the overall molding strength of the upper and lower molds is high, resulting in stable molding, good molding filling, and high surface flatness and smoothness. This mold and process lining PFA space are sealed and clean. After the tube sheet is formed, the cleanliness reaches G5 level, and it has strong corrosion resistance, which is suitable for the application standards of the electronic electrode industry.

[0036] Furthermore, a reinforced sealing structure is provided at the connection between the annular groove 16 and the limiting step 12 on the upper mold 2 and the lower guide mold 3.

[0037] In this embodiment, the reinforced sealing structure is provided to prevent molten PFA liquid from overflowing from the connection between the tube sheet component steel body 10 and the limiting step 12 on the upper mold 2 and the lower guide mold 3.

[0038] For further details, please refer to Figure 1 The first inner guide post 4 and the second inner guide post 5 are provided with a cone-shaped structure, which together with all the inner holes 17 of the tube network in the tube sheet steel body 10 form the inner cavity of the tube sheet mesh molding.

[0039] For further details, please refer to Figure 1 The inner hole 17 of the pipeline has a stepped structure, and the stepped structure of the inner hole 17 matches the conical structure of the first inner guide post 4 and the second inner guide post 5.

[0040] In this embodiment, the first inner guide post 4 and the second inner guide post 5 have a conical angle structure, and the inside of the inner hole 17 of the pipe network has a stepped structure. The stepped structure of the inner hole 17 of the pipe network matches the conical angle structure of the first inner guide post 4 and the second inner guide post 5. All the stepped holes in the steel body 10 of the tube sheet component form the inner cavity of the tube sheet mesh molding, making the inner lining of the tube sheet mesh uniform, easy to demold, with high forming quality and beautiful appearance.

[0041] For further details, please refer to Figure 3 The vent slot 14 is used to discharge air and partially melted PFA liquid.

[0042] In this embodiment, the mold assembly after the tube sheet steel body 10 is installed and filled is heated and pressurized in a high-temperature furnace for a certain period of time according to the temperature control process, so that the PFA granules in the mold melt, flow and fill the inner cavity of the mold and the tube sheet steel body 10. The venting groove 14 is used to discharge air and part of the melted PFA liquid.

[0043] Furthermore, the PFA cavity in the mold liner is used to fill PFA granular powder.

[0044] In this embodiment, the steel body 10 of the tube sheet component forms a complete PFA inner cavity with the injection mold core 1, upper mold 2, lower guide mold 3, first inner guide post 4, and second inner guide post 5. The filler guide sleeve 11 and the molding cavity 13 are used to fill PFA granules. The overall mold heating, heat preservation, and cooling temperature control process allows the PFA granules in the mold to melt, flow fully, and fill better. The tube sheet is integrally molded, and the overall molding strength of the upper and lower molds is high, resulting in stable molding, good molding filling, and high surface flatness and smoothness. This mold and process lining PFA space are sealed and clean. After the tube sheet is formed, the cleanliness reaches G5 level, and it has strong corrosion resistance, which is suitable for the application standards of the electronic electrode industry.

[0045] A process for integral molding of PFA lining with a hot-melt column push-molding die for tube sheet lining includes the following steps:

[0046] S1: Before using the tube sheet hot melt column push mold to close the mold, first install and fix the first inner guide post 4 and the second inner guide post 5 on the lower guide mold 3 with nuts 6 and hex bolts 7, and then fill the molding cavity 13 located at the lower guide mold 3 with PFA granular powder.

[0047] S2: Place and limit the steel body 10 of the tube sheet component between the upper mold 2 and the lower guide mold 3. After filling the molding cavity 13 located in the upper mold 2 with PFA granules, fill the filling guide sleeve 11 in the upper mold 2 with PFA granules. Tighten the upper mold 2 and the lower guide mold 3 with double-headed bolts 9 and thickened nuts 8 to close the mold.

[0048] S3: Then, the injection mold core 1 is inserted into the upper mold 2, so that the tube sheet steel body 10 and the injection mold core 1, upper mold 2, lower guide mold 3, first inner guide post 4, and second inner guide post 5 form a complete mold liner PFA inner cavity. The injection mold core 1 moves up and down to achieve the purpose of pushing and pressing mold.

[0049] S4: The PFA liner cavity after the upper mold 2 and lower guide mold 3 of the steel body 10 of the tube sheet component are closed is heated and pressurized in a high-temperature furnace, so that the PFA granules in the PFA liner cavity melt, flow, and fill the PFA liner cavity, and discharge excess air and melted PFA liquid.

[0050] S5: Hold the temperature in the range of 250-300℃ for 10-15 minutes, then cool it down to below 60℃ and open the mold. Take out the tube sheet lined with PFA, cut off the excess PFA material from the vent, and obtain the tube sheet lined with PFA.

[0051] Further, please refer to the figure. In step S4, the heating temperature is 300-350℃, the pressurization pressure is 6-10MPA, and the heating and pressurization time is 15-20min.

[0052] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A die for pressing PFA hot melt columns in tube sheet lining, characterized in that: It includes the injection mold core (1), the upper mold (2), the lower guide mold (3) and the steel body of the tube sheet component (10); The upper mold (2) is provided with a filler guide sleeve (11), a limiting step (12), and a molding cavity (13). The injection mold core (1) is housed inside the filler guide sleeve (11). The injection mold core (1) can move up and down inside the filler guide sleeve (11) to achieve the purpose of pushing and pressing the mold. The lower guide mold (3) is provided with an exhaust groove (14), a through hole (15), a limiting step (12), and a molding cavity (13). The tube sheet steel body (10) is provided with an annular groove (16) and a pipe network inner hole (17). The upper mold (2) The upper mold (2) and the lower guide mold (3) are fixedly connected by thickened nuts (8) and double-headed bolts (9). The tube sheet steel body (10) is located between the upper mold (2) and the lower guide mold (3). The tube sheet steel body (10) is installed in a limited position by the annular groove (16) and the limiting step (12) on the upper mold (2) and the lower guide mold (3). The upper surface of the tube sheet steel body (10) is connected to the molding cavity (13) of the upper mold (2), and the lower surface is connected to the molding cavity (13) of the lower guide mold (3). The through hole (15) and the inner hole of the pipeline (17) are coaxial and interconnected. A first inner guide post (4) is fixed inside one of the through holes (15) and the inner hole of the pipeline (17) by a nut (6) and a hexagonal bolt (7). A second inner guide post (5) is fixed inside the other through hole (15) and the inner hole of the pipeline (17) by a nut (6) and a hexagonal bolt (7). The steel body (10) of the tube sheet component forms a complete PFA inner cavity with the injection mold core (1), the upper mold (2), the lower guide mold (3), the first inner guide post (4), and the second inner guide post (5).

2. The tube sheet liner PFA hot melt column push-molding die as described in claim 1, characterized in that: The connection between the annular groove (16) and the limiting step (12) on the upper mold (2) and the lower guide mold (3) is provided with a reinforced sealing structure.

3. The tube sheet liner PFA hot melt column push-molding die as described in claim 1, characterized in that: The first inner guide post (4) and the second inner guide post (5) are provided with a cone-shaped structure, and the cone-shaped structure and all the inner holes (17) of the tube network in the tube sheet steel body (10) form the tube sheet mesh molding cavity.

4. The tube sheet liner PFA hot melt column push-molding die as described in claim 3, characterized in that: The inner hole (17) of the pipeline has a stepped structure, and the stepped structure of the inner hole (17) matches the cone angle structure of the first inner guide post (4) and the second inner guide post (5).

5. The tube sheet liner PFA hot melt column push-molding die as described in claim 1, characterized in that: The vent slot (14) is used to discharge air and partially melted PFA liquid.

6. The tube sheet liner PFA hot melt column push-molding die as described in claim 1, characterized in that: The PFA cavity in the mold liner is used to fill PFA granular powder.

7. A process for integral molding of PFA-lined tube sheet using a hot-melt column push-molding die, comprising a hot-melt column push-molding die as described in any one of claims 1-6, characterized in that, Includes the following steps: S1: Before using the tube sheet hot melt column push molding die to close the mold, first install and fix the first inner guide column (4) and the second inner guide column (5) on the lower guide mold (3) with nuts (6) and hex bolts (7), and then fill the molding cavity (13) located at the lower guide mold (3) with PFA granular powder. S2: Place and position the tube sheet steel body (10) between the upper mold (2) and the lower guide mold (3). Fill the molding cavity (13) located in the upper mold (2) with PFA granules and then fill the filler guide sleeve (11) in the upper mold (2) with PFA granules. Tighten the upper mold (2) and the lower guide mold (3) with double-headed bolts (9) and thickened nuts (8) to close the mold. S3: Then, insert the injection mold core (1) into the upper mold (2) so that the tube sheet steel body (10) and the injection mold core (1), upper mold (2), lower guide mold (3), first inner guide post (4), and second inner guide post (5) form a complete mold liner PFA inner cavity. Move the injection mold core (1) up and down to achieve the purpose of pushing and pressing the mold. S4: The PFA inner cavity of the mold liner after the upper mold (2) and lower guide mold (3) of the steel body (10) of the tube sheet component are closed is heated and pressurized in a high-temperature furnace, so that the PFA granules in the PFA inner cavity of the mold liner melt, flow, fill the PFA inner cavity of the mold liner, and discharge excess air and melted PFA liquid. S5: Hold the temperature in the range of 250-300℃ for 10-15 minutes, then cool it down to below 60℃ and open the mold. Take out the tube sheet lined with PFA, cut off the excess PFA material from the vent, and obtain the tube sheet lined with PFA.

8. The integral molding process for PFA lining with a hot-melt column push-molding die as described in claim 7, characterized in that: In step S4, the heating temperature is 300-350℃, the pressurization pressure is 6-10MPA, and the heating and pressurization time is 15-20min.

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