Paper pulp molding mold

Abstract

The utility model relates to the technical field of paper pulp molding, and discloses a paper pulp molding mold, which comprises an upper mold and a lower mold, the upper mold and the lower mold are correspondingly matched to form a mold, the upper mold and the lower mold are respectively provided with a central positioning ring, and the central positioning rings are positioned at the central position above the upper mold and the central position below the lower mold. The positioning device is used for positioning and matching the die with the upper-end equipment and the lower-end equipment. An upper heating plate and a lower heating plate are arranged on the mold, an upper heating rod is arranged above the upper heating plate, a lower heating rod is arranged below the lower heating plate, the upper heating plate and the upper mold are positioned through the center positioning ring, the lower heating plate and the lower mold are positioned through the center positioning ring, and the upper heating plate and the lower heating plate are each provided with an air exhaust hole and an air blowing hole. And the air exhaust hole and the air blowing hole are communicated with the upper die and the lower die through the straight holes in the upper heating plate and the lower heating plate. The upper die and the lower die are heated more uniformly in the working process, the heat loss is reduced, the center positioning precision is high, and the die displacement is effectively prevented.

Description

Technical Field

[0001] This utility model relates to the field of pulp molding technology, and in particular to a pulp molding mold. Background Technology

[0002] Traditional pulp molding dies are costly, have long production cycles, high moisture content in the blanks, long hot-pressing and drying times, and uneven suction. Furthermore, during the molding process, inaccurate positioning leads to difficulties in die alignment, and die displacement after machine shutdown necessitates realignment. These are all bottlenecks that are difficult to resolve within the industry.

[0003] For example, the Chinese patent "A method for producing pulp molded products and a pulp molding mold" (publication number: CN1360109A) heats the molded product by installing heating components inside the upper and lower molds. This heating structure is complex, cannot accurately control the temperature, and affects the drainage of the blank. Utility Model Content

[0004] The purpose of this invention is to solve the above problems by providing a pulp molding die that allows for more uniform heating of the upper and lower dies during operation, reduces heat loss, and provides high center positioning accuracy, effectively preventing die displacement.

[0005] The technical solution adopted by this utility model is:

[0006] A pulp molding die is characterized by comprising an upper die and a lower die, the upper die and the lower die correspondingly fitting together to form a die, and a central positioning ring is respectively provided on the upper die and the lower die, the central positioning ring being located at the upper center position of the upper die and the lower center position of the lower die, for positioning and fitting between the die and the upper and lower end equipment.

[0007] Furthermore, an upper heating plate is provided above the upper mold, and a lower heating plate is provided below the lower mold. An upper heating rod is provided above the upper heating plate, and a lower heating rod is provided below the lower heating plate. The upper heating plate and the upper mold, and the lower heating plate and the lower mold are all positioned by the central positioning ring. Both the upper heating plate and the lower heating plate are provided with air extraction holes and air blowing holes. The air extraction holes and air blowing holes are connected to the upper mold and the lower mold through straight holes on the upper heating plate and the lower heating plate.

[0008] Furthermore, the upper heating plate and the lower heating plate are both surrounded by an insulation layer, and the lower heating rod and the lower heating rod are both provided with upper and lower cover plates, and the outer side of the cover plates is provided with upper and lower heat insulation plates.

[0009] Furthermore, a heat insulation groove is formed on the outer surface of the cover plate, and the heat insulation groove cooperates with the heat insulation plate.

[0010] Furthermore, the non-contact surface between the upper heating plate and the upper mold forms an upper cavity, and the non-contact surface between the lower heating plate and the lower mold forms a lower cavity. The upper and lower cavities are connected to the straight holes on the heating plate, and the air extraction hole and air blowing hole pass through the cover plate and the heat insulation plate.

[0011] Furthermore, stainless steel sleeves are inlaid on the air extraction and blowing holes on the heat insulation board.

[0012] Furthermore, a sealing ring is provided between the upper heating plate and the upper cover plate, and between the lower heating plate and the lower cover plate, located outside the upper and lower cavities, and a positioning pin is provided between the upper mold and the upper heating plate, and between the lower mold and the lower heating plate.

[0013] Furthermore, the central positioning ring includes a positioning hole and a positioning post. The positioning post is fitted into the positioning hole. The positioning hole and the positioning post are respectively arranged in pairs between the upper heating plate and the upper mold, between the lower heating plate and the lower mold, between the upper heating plate and the upper cover plate, between the lower heating plate and the lower cover plate, between the upper cover plate and the upper heat insulation plate, and between the lower cover plate and the lower heat insulation plate.

[0014] Furthermore, the mold includes multiple mold cores arranged in an array, and the multiple mold cores share a set of upper and lower molds and upper and lower heating plates.

[0015] Furthermore, the upper heating plate and the upper mold, and the lower heating plate and the lower mold are respectively provided with flat key limiting fits in the front, back, left, and right directions.

[0016] The beneficial effects of this utility model are:

[0017] (1) The method of installing heating rods at both ends of the upper and lower molds allows the heating plate to heat up evenly, and also reduces the difficulty of production and improves the accuracy of the heating rod holes;

[0018] (2) The heating plate is insulated to reduce heat loss and ensure that the heat from the heating plate can be transferred to the mold more effectively.

[0019] (3) Heating can be monitored and controlled in real time through PTC circuit detection;

[0020] (4) By center positioning of the mold and flat key, the mold is ensured to be symmetrical in front, back and left and right, which not only ensures the accuracy of center positioning, but also prevents the mold from shifting.

[0021] (5) A stainless steel sleeve is inserted into the heat insulation board. When the air is pumped or blown, the airflow will not directly enter the heat insulation board, reducing the impact of steam and compressed air on the heat insulation board and ensuring that the heat insulation board will not delaminate. Attached Figure Description

[0022] Appendix Figure 1 This is a top view of the mold of this utility model without the heating plate installed;

[0023] Appendix Figure 2 It is attached Figure 1 AA sectional view diagram;

[0024] Appendix Figure 3 This is a horizontal cross-sectional view of the position of the upper heating plate of this utility model;

[0025] Appendix Figure 4 This is a vertical sectional view of the present invention;

[0026] Appendix Figure 5 It is attached Figure 4 The corresponding vertical sectional view.

[0027] The labels in the attached diagram are as follows:

[0028] 1. Upper mold; 2. Lower mold;

[0029] 3. Mold cavity; 4. Central positioning ring;

[0030] 5. Upper heat insulation panel; 6. Lower heat insulation panel;

[0031] 7. Airway; 8. Suction port;

[0032] 9. Air inlet; 10. Mold core;

[0033] 11. Upper heating plate; 12. Lower heating plate;

[0034] 13. Upper heating rod; 14. Lower heating rod;

[0035] 15. Locating pin; 16. Straight hole;

[0036] 17. Insulation layer; 18. Top cover plate;

[0037] 19. Lower cover plate; 20. Upper cavity;

[0038] 21. Lower cavity; 22. Sealing ring;

[0039] 23. Parallel key; 24. Stainless steel sleeve;

[0040] 25. Insulation groove. Detailed Implementation

[0041] The specific embodiments of the pulp molding die of this utility model will be described in detail below with reference to the accompanying drawings.

[0042] See appendix Figure 1 , 2In a pulp molding die, an upper mold 1 and a lower mold 2 form a cavity 3. The lower mold 2 is the punch, and the upper mold 1 is the die. The upper mold 1 is pressed into the cavity 3 to form a molded product. After drying, a paper product is formed. The upper mold 1 and lower mold 2 are positioned by a central positioning ring 4. The upper mold 1 is fixed to the upper equipment by fasteners, and the upper equipment and the upper mold 1 are positioned and engaged by the positioning ring 4. The lower mold 2 is fixed to the lower equipment by fasteners, and the lower equipment and the lower mold 2 are positioned and engaged by the positioning ring 4. The central positioning ring 4 coaxially positions the upper and lower molds 1 and 2 through positioning holes and positioning pins. The positioning holes and positioning pins are interchangeable between the upper and lower molds 1 and 2 and the upper and lower equipment.

[0043] The center positioning method improves positioning accuracy in both cold and hot mold states by allowing thermal expansion to diffuse from the center outwards after the mold is heated.

[0044] Both the upper mold 1 and the lower mold 2 are provided with air passages 7 that connect to the mating mold cavity 3. The air passages 7 also connect to the subsequent air extraction hole 8 and air blowing hole 9.

[0045] The mold includes multiple mold cores 10, which are arranged in an array. The multiple mold cores 10 share a set of upper and lower molds 1 and 2. After one molding, the mold is blown to produce multiple products at the same time.

[0046] See appendix Figure 3 , 4 5. An upper heating plate 11 is installed above the upper mold 1, and a lower heating plate 12 is installed below the lower mold 2. An upper heating rod 13 is installed inside the upper heating plate 11, and a lower heating rod 14 is installed inside the lower heating plate 12. A central positioning ring 4 in the middle of the mold positions the upper heating plate 11 with the upper mold 1 and the lower heating plate 12 with the lower mold 2. Vertical flat keys 23 are provided for limiting the fit between the upper heating plate 11 and the upper mold 1, and between the lower heating plate 12 and the lower mold 2. The flat keys 23 and keyways fit on the surfaces of the upper and lower parts, limiting their relative positions and ensuring symmetry in all directions. Both the keyways and flat keys 23 are elongated ovals and symmetrical in the two vertical directions.

[0047] The heating rod uses PTC electric heating, and the working status and fuse working status are detected by energizing the PTC coil to achieve management of the heating process.

[0048] Both the upper heating plate 11 and the lower heating plate 12 are provided with air extraction holes 8 and air blowing holes 9. The air extraction holes 8 and air blowing holes 9 are connected to the air passages 7 of the upper mold 1 and the lower mold 2 through the straight holes 16 on the upper heating plate 11 and the lower heating plate 12.

[0049] The straight hole 16 on the heating plate is connected to the mold, and the vacuum pump is used to quickly remove the moisture from the product through the air extraction hole 8, so that the product can be dried quickly in a short time, and the drying efficiency is increased by more than 20%.

[0050] Both the upper heating plate 11 and the lower heating plate 12 are surrounded by an insulation layer 17, and upper and lower cover plates 18 and 19 are installed on the outside of both the upper heating plate 11 and the lower heating plate 12. The upper and lower cover plates 18 and 19 are covered by upper and lower heat insulation plates 5 and 6. The air extraction hole 8 and the air blowing hole 9 extend through the upper and lower heat insulation plates 5 and 6, and stainless steel sleeves 24 are inserted at the positions of the upper and lower heat insulation plates 5 and 6. This ensures that the airflow does not pass through the heat insulation plates during air extraction and blowing, preventing the heat insulation plates from delaminating.

[0051] Insulation grooves 25 are formed on the outer surfaces of the upper and lower cover plates 18 and 19. The insulation grooves 25 cooperate with the upper and lower insulation plates 5 and 6 to form an air barrier between the upper and lower cover plates 18 and 19 and the upper and lower insulation plates 5 and 6, thereby achieving a better heat preservation effect. The upper heating plate 11 is also positioned with respect to the upper cover plate 18, the lower heating plate 12 is positioned with respect to the lower cover plate 19, the upper cover plate 18 is positioned with respect to the upper insulation plate 5, and the lower cover plate 19 is positioned with respect to the lower insulation plate 6 by means of a central positioning ring 4.

[0052] The non-contact surface between the upper heating plate 11 and the upper mold 1 forms an upper cavity 20, and the non-contact surface between the lower heating plate 12 and the lower mold 2 forms a lower cavity 21.

[0053] Air is the best heat insulation material, with a thermal conductivity of only 0.04 (w / m·k). The upper and lower cavities 20 and 21 can play a good heat insulation role. With the good heat insulation effect of the upper and lower heating plates 12 and 14, the heat of the heating plates can be better transferred to the upper and lower molds 1 and 2.

[0054] The non-contact surfaces include air cavities formed on the surfaces of the upper heating plate 11 and the lower heating plate 12, as well as some mounting holes. The air cavities are connected to the suction port 8 and the blowing port 9. A sealing ring 22 is provided between the upper heating plate 11 and the upper cover plate 18, and between the lower heating plate 12 and the lower cover plate 19, located outside the air cavities.

[0055] When both the upper and lower heating plates 11 and 12 are heated, the heating plates can generate heat evenly, reducing production difficulty and improving the accuracy of the heating rod holes. At the same time, insulation measures are taken around the heating plates to reduce heat loss and ensure that the heat from the heating plates can be transferred to the mold more effectively.

[0056] During operation, the lower mold 2 moves downward and pressurizes through a gas-liquid booster cylinder (not shown in the figure), causing the squeezed water to be drawn away through the vacuum extraction hole 8 of the lower mold 2. At the same time, water vapor inside the heated product is drawn away through the vacuum extraction hole 8 until the product is dried. After the product is dried, the upper mold 1 draws in air through the vacuum extraction hole 8, and the lower mold 2 blows air through compressed air, transferring the product from the hot lower mold 2 to the hot upper mold 1. At this time, the gas-liquid booster cylinder rises, the lower mold 2 moves through a servo motor (not shown in the figure), the vacuum extraction hole 8 of the upper mold 1 closes, the blowing hole 9 opens, and the upper mold 1 blows the product into the receiving tray, thus completing the entire molding and drying process.

[0057] The above are merely preferred embodiments of this utility model. It should be noted that those skilled in the art can make several improvements and modifications without departing from the principle of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model.

Claims

1. A pulp molding die, characterized in that: The device includes an upper mold and a lower mold, which are fitted together to form a mold. A central positioning ring is provided on each of the upper and lower molds, located at the center above the upper mold and the center below the lower mold, respectively, to facilitate positioning between the mold and the upper and lower equipment. An upper heating plate is provided above the upper mold, and a lower heating plate is provided below the lower mold. An upper heating rod is provided above the upper heating plate, and a lower heating rod is provided below the lower heating plate. The upper heating plate and the upper mold, as well as the lower heating plate and the lower mold, are positioned by the central positioning rings. Both the upper and lower heating plates have suction holes and blowing holes, which are connected to the upper and lower molds through straight holes on the upper and lower heating plates.

2. The pulp molding die according to claim 1, characterized in that: The upper heating plate and the lower heating plate are both surrounded by an insulation layer. The lower heating rod and the lower heating rod are both provided with upper and lower cover plates, and upper and lower heat insulation plates are provided on the outside of the cover plates.

3. The pulp molding die according to claim 2, characterized in that: The outer surface of the cover plate has a heat insulation groove, which is matched with the heat insulation plate.

4. The pulp molding die according to claim 3, characterized in that: The non-contact surface between the upper heating plate and the upper mold forms an upper cavity, and the non-contact surface between the lower heating plate and the lower mold forms a lower cavity. The upper and lower cavities are connected to the straight holes on the heating plate, and the air extraction hole and air blowing hole pass through the cover plate and the heat insulation plate.

5. The pulp molding die according to claim 4, characterized in that: Stainless steel sleeves are inserted into the air extraction and blowing holes on the heat insulation board.

6. The pulp molding die according to any one of claims 1 to 5, characterized in that: A sealing ring is provided between the upper heating plate and the upper cover plate, and between the lower heating plate and the lower cover plate, located outside the upper and lower cavities. A positioning pin is provided between the upper mold and the upper heating plate, and between the lower mold and the lower heating plate.

7. The pulp molding die according to any one of claims 1 to 5, characterized in that: The central positioning ring includes a positioning hole and a positioning post. The positioning post is fitted into the positioning hole. The positioning hole and the positioning post are respectively arranged in pairs between the upper heating plate and the upper mold, between the lower heating plate and the lower mold, between the upper heating plate and the upper cover plate, between the lower heating plate and the lower cover plate, between the upper cover plate and the upper heat insulation plate, and between the lower cover plate and the lower heat insulation plate.

8. The pulp molding die according to any one of claims 1 to 5, characterized in that: The mold includes multiple mold cores arranged in an array, and the multiple mold cores share a set of upper and lower molds and upper and lower heating plates.

9. The pulp molding die according to any one of claims 1 to 5, characterized in that: The upper heating plate and the upper mold, and the lower heating plate and the lower mold are respectively provided with flat key limiting fits in the front, back, left and right directions.

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