A mold forming device of a blister packaging machine

Abstract

The application discloses a mould forming device of a blister packaging machine, and relates to the technical scheme that the device comprises a roll, a sheet material traction mechanism, a heating mechanism and a forming mechanism, the forming mechanism comprises a lower mould base and an upper mould base, the lower mould base comprises a mould plate and a ventilation chamber, the mould plate is provided with a plurality of mould grooves, the bottom and the sidewall of the mould groove are respectively provided with a gas hole A and a gas hole B which are communicated with the ventilation chamber, the gas hole A is provided with a telescopic rod, the telescopic rod is provided with a sealing end face corresponding to the gas hole A and a closing plate corresponding to the gas hole B, the telescopic rod has a first state and a second state, in the first state, the sealing end face is separated from the gas hole A, and the closing plate is matched with the gas hole B, in the second state, the sealing end face is matched with the gas hole A, and the closing plate is separated from the gas hole B. The application can heat and keep the plastic sheet, and can ensure that the plastic sheet is well attached to the mould groove, and good forming effect is ensured.

Description

Technical Field

[0001] This invention relates to the field of blister packaging technology, and more specifically to a mold forming device for a blister packaging machine. Background Technology

[0002] Plastic product processing and molding processes include extrusion, injection molding, calendering, and thermoforming. Among these, thermoforming technology is widely used to produce packaging products such as trays and blister boxes. Currently, thermoforming machines typically use a vacuum suction method in the mold forming section to deform the pre-heated and softened plastic sheet, allowing it to conform to the mold and achieve the desired shape. Finally, the sheet is allowed to cool and solidify.

[0003] However, the aforementioned prior art still has some drawbacks. The prior art generally simply sets a vent at the bottom of the mold groove to create negative pressure, for example... Figure 9 As shown, this method easily leads to gaps 20 when thicker plastic sheets cannot adhere well to the sidewalls of the mold groove during the vacuum forming process. This is because during the deformation of the plastic sheet, the lower part of the plastic sheet is subjected to suction from the pores, causing the adhesion speed of the lower part of the plastic sheet to be greater than that of its sidewalls. After the lower part adheres, the pores are blocked prematurely. If the plastic sheet is thick, this situation can easily lead to insufficient suction pressure, and the plastic sheet cannot adhere well to the sidewalls of the mold groove, resulting in poor vacuum forming effect. At the same time, the existing demolding method relies on waiting for natural cooling, which is generally ineffective and slow. Furthermore, during the process of heating the plastic sheet and conveying it to the mold mechanism, if the ambient temperature is low, heat will be lost rapidly, easily leading to poor mold forming effect. Based on this, this application proposes an improved mold forming device to solve the above problems. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the present invention provides a mold forming device for a blister packaging machine, which can keep the plastic sheet warm after heating and ensure that the plastic sheet fits well in the mold groove, thus ensuring a good forming effect.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a mold forming device for a blister packaging machine, comprising a roll roller, a sheet traction mechanism, a heating mechanism, and a forming mechanism, characterized in that: the forming mechanism includes a lower mold base and an upper mold base adapted to each other; the lower mold base includes a mold plate and a ventilation chamber; the mold plate is provided with a plurality of mold grooves; the bottom and sidewall of the mold grooves are respectively provided with air holes A and B; both air holes A and B are connected to the ventilation chamber; a telescopic rod is provided inside air hole A; the telescopic rod is provided with a sealing end face corresponding to air hole A and a closing plate corresponding to air hole B; the telescopic rod has a first state and a second state;

[0006] In the first state, the sealing end face is separated from the air hole A, and the closing plate abuts against the air hole B;

[0007] In the second state, the sealing end face abuts against vent A. The closing plate separates from vent B.

[0008] The present invention is further configured such that: a heat preservation mechanism is provided between the heating mechanism and the forming mechanism; the heat preservation mechanism includes a heat preservation chamber, an air inlet fan, and an air outlet fan; the heating mechanism includes an air guide plate located on the periphery of the heating mechanism and an air guide channel located inside the heating mechanism; the heating mechanism has an air guide hole on its side wall that communicates with the air guide channel; the air guide hole is located below the air guide plate; the air inlet fan connects the air guide channel and the heat preservation chamber; and the air outlet fan connects the heat preservation chamber and an external waste gas treatment device.

[0009] The present invention is further configured such that: an electric heating plate is provided inside the heating mechanism, the air guiding channel is located at the upper part of the electric heating plate, heat dissipation fins are provided on the electric heating plate, and the heat dissipation fins extend into the air guiding channel.

[0010] The present invention is further configured such that the air guide plate is inclined to one side of the air guide channel from bottom to top.

[0011] The present invention is further configured such that: a groove is provided on the side wall of the mold groove, the groove corresponds to the position of the air hole B, a baffle is provided in the groove, the surface of the baffle is flush with the side wall surface of the mold groove, and an air passage gap is formed between the baffle and the groove.

[0012] The present invention is further configured such that the groove and the baffle are arranged in a strip-shaped structure extending vertically.

[0013] The present invention is further configured such that: a groove B is provided at the air hole A, and the sealing end face is adapted to the groove B, so that in the second state, the surface of the sealing end face is flush with the surface of the bottom of the mold groove.

[0014] The invention is further configured such that: a spring is provided between the sealing end face and the mold groove; a limiting end face is provided on the other end of the telescopic rod opposite to the sealing end face, and the limiting end face is adapted to the bottom of the mold groove.

[0015] The present invention is further configured such that: a pressing inclined plate is provided at the air hole B, and the closing plate is provided with an inclined surface structure adapted to the pressing inclined plate.

[0016] The present invention is further configured to include an air pump mechanism and a reversing solenoid valve. The air pump mechanism includes an air pump and a negative pressure pump. Both the air pump and the negative pressure pump are connected to the reversing solenoid valve. The reversing solenoid valve is connected to the ventilation chamber. The operation of the reversing solenoid valve connects the air pump or the negative pressure pump to the ventilation chamber.

[0017] In summary, the present invention has the following beneficial effects:

[0018] Compared to existing technologies, this invention features air holes A and B within the mold groove, along with a telescopic rod. In the first state, the telescopic rod opens air hole A and closes air hole B, causing the plastic sheet to be stretched downwards under pressure. As the plastic sheet continues to stretch downwards, it encounters the sealing end face on the telescopic rod, causing it to continue downwards and switch to the second state. In this state, air hole A is blocked, and air hole B is opened, generating suction along the sidewall. This further attracts any partially adhered plastic sheet, ensuring that the side of the plastic sheet is completely adhered to the sidewall of the mold groove. Thus, through the alternating attraction of air holes A and B, regardless of the thickness of the plastic sheet, it is possible to achieve complete adhesion of the plastic sheet to the mold groove, resulting in excellent vacuum forming performance.

[0019] Meanwhile, in this invention, the sealing end face falls into the groove B when sealing the air hole A. The surface of the sealing end face is flush with the bottom surface. The side wall of the mold groove is provided with a groove and a baffle, so that the suction force at the air hole B is generated through the air gap between the groove and the baffle. In the prior art, the plastic sheet will directly contact the air hole, resulting in a small protrusion on the surface of the vacuum forming. This small protrusion is formed because part of the plastic sheet is sucked into the air hole, resulting in an unsightly appearance after forming. Therefore, the structure of this invention makes it less likely for the small protrusion caused by the suction of air holes A and B to appear on the surface of the plastic sheet after vacuum forming, resulting in a smooth and beautiful appearance.

[0020] The present invention incorporates a heat preservation mechanism between the heating mechanism and the molding mechanism. The heat preservation mechanism obtains the residual heat generated by the heating mechanism and uses this residual heat to maintain the temperature of the plastic sheet during the conveying process. Even in a low-temperature environment, the plastic sheet will not cool down too quickly, ensuring a good molding effect in the future. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of this embodiment;

[0022] Figure 2 This is a schematic diagram of the internal structure of the heating mechanism and the heat preservation mechanism in this embodiment;

[0023] Figure 3 This is a top view schematic diagram of the heating mechanism and the heat preservation mechanism in this embodiment;

[0024] Figure 4 This is a schematic diagram of the internal structure of the lower mold base in this embodiment;

[0025] Figure 5 This is a schematic diagram of the three-dimensional structure of the mold groove in this embodiment;

[0026] Figure 6This is a schematic diagram of the internal structure of the mold groove in this embodiment;

[0027] Figure 7 This is a schematic diagram of the three-dimensional structure of the bottom side of the mold groove in this embodiment;

[0028] Figure 8 This is a schematic diagram of the internal structure of the air pump mechanism in this embodiment;

[0029] Figure 9 This is a schematic diagram of the internal structure of a mold groove in existing technology.

[0030] Reference numerals: 1. Roller; 2. Sheet traction mechanism; 3. Heating mechanism; 301. Air guide plate; 302. Air guide channel; 3021. Air guide hole; 303. Electric heating plate; 3031. Heat dissipation fins; 4. Forming mechanism; 5. Lower mold base; 501. Mold plate; 5011. Mold groove; 502. Ventilation chamber; 6. Upper mold base; 7. Air hole A; 701. Sealing end face; 8. Air hole B; 801. Closing plate; 80 2. Pressing inclined plate; 9. Insulation mechanism; 901. Insulation chamber; 902. Inlet fan; 903. Outlet fan; 10. Groove; 11. Baffle; 12. Ventilation gap; 13. Groove B; 14. Telescopic rod; 1401. Limiting end face; 15. Air pump mechanism; 1501. Air pump; 1502. Negative pressure pump; 16. Reversing solenoid valve; 18. Plastic sheet; 20. Gap; 21. Small protrusion; 22. Plastic sheet. Detailed Implementation

[0031] The present invention will be further described in detail below with reference to the accompanying drawings.

[0032] This embodiment discloses a mold forming device for a blister packaging machine, such as... Figure 1-8As shown, the device includes a roll roller 1, a sheet traction mechanism 2, a heating mechanism 3, and a forming mechanism 4. The forming mechanism 4 includes a matching lower mold base 5 and an upper mold base 6. The upper mold base 6 can be raised and lowered via a lifting mechanism. When raised, the plastic sheet enters between the upper and lower mold bases; when lowered, the plastic sheet is pressed down for forming. Specifically, the lower mold base 5 includes a mold plate 501 and a ventilation chamber 502. The mold plate 501 is provided with several mold grooves 5011. The bottom and side walls of the mold grooves 5011 are divided into... The system includes vents A7 and B8, both of which are connected to the ventilation chamber 502. Vent A7 contains a telescopic rod 14, which has a sealing end face 701 corresponding to vent A7 and a closing plate 801 corresponding to vent B8. The telescopic rod 14 has a first state and a second state. In the first state, the sealing end face 701 is separated from vent A7, and the closing plate 801 abuts against vent B8. In the second state, the sealing end face 701 abuts against vent A7, and the closing plate 801 is separated from vent B8. Through the above structure, the telescopic rod 14 is equipped with a spring to realize telescopic movement. Under normal conditions, the telescopic rod is held in the first state by the action of the spring. When a negative pressure is generated in the ventilation chamber 502, it will be conducted to the mold groove through the air hole A, causing the heated plastic sheet to deform into the mold groove. When the plastic sheet deforms until it drives the telescopic rod 14 to move, the sealing end face 701 is inserted into the groove B13, and the sealing end face blocks the air hole A. At this time, the side closing plate 801 is simultaneously driven by the telescopic rod to open the air hole B8, so that the negative pressure in the ventilation chamber can be adsorbed on the side of the plastic sheet through the air hole B. Thus, this embodiment, through the staged adsorption of the bottom and the side, first fully shapes the bottom of the plastic sheet, and then fully shapes the side, so that the plastic sheet can be completely attached to the mold groove 5011, and a good molding effect can be obtained regardless of the thickness of the plastic sheet. In the prior art, for example, Figure 9 Typically, only a single air hole is created at the bottom. This creates negative pressure through suction, so during the vacuum forming of the plastic sheet 22, the lower part of the sheet is drawn in by the air hole, causing its bonding speed to exceed that of its sidewalls. Once the lower part is bonded, the air hole is blocked prematurely. If the plastic sheet is thick, this can lead to insufficient suction pressure, preventing the sheet from properly adhering to the sidewalls of the mold groove, resulting in issues such as… Figure 9 The gaps in the 20mm diameter result in poor molding quality.

[0033] Furthermore, in this embodiment, a heat preservation mechanism 9 is provided between the heating mechanism 3 and the forming mechanism 4. The heat preservation mechanism 9 includes a heat preservation chamber 901, an air inlet fan 902, and an air outlet fan 903. The heating mechanism 3 includes an air guide plate 301 located on the periphery of the heating mechanism and an air guide channel 302 located inside the heating mechanism. The air guide plate 301 is inclined from bottom to top to one side of the air guide channel 302. The heating mechanism 3 has an air guide hole 3021 on its side wall that communicates with the air guide channel 302. The air guide hole 3021 is located below the air guide plate 301. The air inlet fan 902 connects the air guide channel 302 and the heat preservation chamber 901, and the air outlet fan 903 connects the heat preservation chamber 901 and the external waste gas treatment device. Meanwhile, the heating mechanism 3 is equipped with an electric heating plate 303, and the air guide channel 302 is located above the electric heating plate 303. The electric heating plate 303 is equipped with heat dissipation fins 3031, which extend into the air guide channel 302. Through the above structure, the heat preservation mechanism 9 can effectively ensure that the plastic sheet does not lose heat quickly even when the ambient temperature is low during the process of being heated by the heating mechanism 3 and transported to the molding mechanism, thus ensuring a good molding effect. Specifically, the heating mechanism 3 is equipped with an electric heating plate 303, which is equipped with heat dissipation fins 3031. The heat dissipation fins 3031 can assist the electric heating plate in dissipating heat and conduct this heat to the air guide channel 302. Then, the hot air in the air guide channel 302 can be transported to the heat preservation chamber 901 by the air intake fan 902 for heat preservation. Meanwhile, the side of the heating mechanism 3 is also provided with a guide plate 301 and a guide hole 3021. Since the plastic sheet is generally made of PVC material, it will produce harmful gases after heating, which are harmful to the body. Therefore, it is necessary to guide the harmful gases in the surrounding area through the guide plate. With the continuous operation of the intake fan 902, the harmful gases are allowed to enter the guide channel, then enter the heat preservation chamber, and finally be transported to the external waste gas treatment device through the exhaust fan 902. Thus, through this embodiment, not only can the residual heat of the heating mechanism be used to keep the plastic sheet warm, but the waste gas can also be treated to ensure a good air environment in the factory.

[0034] Furthermore, a groove 10 is provided on the side wall of the mold groove 5011, corresponding to the position of the air hole B8. A baffle 11 is provided in the groove 10, and the surface of the baffle 11 is flush with the surface of the side wall of the mold groove 5011. A ventilation gap 12 is formed between the baffle 11 and the groove 10. The groove and the baffle are arranged in a strip-shaped structure extending vertically. A groove B13 is provided at the air hole A7, and the sealing end face 701 is adapted to the groove B13 so that in the second state, the surface of the sealing end face 701 is flush with the surface of the bottom of the mold groove 5011. With the above structure, the groove 10 and the baffle 11, as well as the groove B13 and the air hole A, allow the gas to be drawn out of the mold groove through the ventilation gap 12 during adsorption, whereas the prior art directly adsorbs through a single air hole. Figure 9 This can easily cause the plastic sheet 22 to be sucked into the hole of the air vent, resulting in a small protrusion 21 forming on the surface of the plastic sheet, which affects the appearance after molding. However, the air gap 12 in this embodiment is narrower, making it less likely for the surface of the plastic sheet to be sucked in. At the same time, the sealing end face 701 and the groove B are flush during sealing, so the surface of the plastic sheet will not be sucked in either, making the surface of the plastic sheet flat and beautiful after molding.

[0035] Furthermore, a spring is provided between the sealing end face 701 and the mold groove 5011; a limiting end face 1401 is provided on the other end of the telescopic rod 14 opposite to the sealing end face 701, and the limiting end face 1401 is adapted to the bottom of the mold groove 5011. With the above structure, the limiting end face 1401 is used to limit the stroke of the telescopic rod 14, and in combination with the sealing end face 701, the telescopic rod 14 can extend and retract within the air hole A.

[0036] Furthermore, a pressing inclined plate 802 is provided at the vent B8, and the closing plate 801 is provided with an inclined surface structure adapted to the pressing inclined plate 802. Through the above structure, the pressing inclined plate 802 and the inclined surface structure on the closing plate 801 can strengthen the pressure of the closing plate 801 towards the vent B8. At the same time, the pressing inclined plate 802 can also guide the movement of the closing plate 801, making it move tightly against the side wall, ensuring accurate blocking of the vent B.

[0037] Furthermore, it also includes an air pump mechanism 15 and a reversing solenoid valve 16. The air pump mechanism 15 includes an air pump 1501 and a negative pressure pump 1502. Both the air pump 1501 and the negative pressure pump 1502 are connected to the reversing solenoid valve 16. The reversing solenoid valve 16 is connected to the ventilation chamber 502. Through the action of the reversing solenoid valve 16, the air pump or the negative pressure pump is connected to the ventilation chamber. With the above structure, the ventilation chamber has two states: air extraction and air inflation. During molding, the reversing solenoid valve 16 connects the negative pressure pump to the ventilation chamber, allowing the plastic sheet to adhere to the mold groove due to adsorption. When demolding is required, the reversing solenoid valve 16 switches, connecting the air pump to the ventilation chamber, increasing the air pressure in the ventilation chamber. This allows gas to be delivered to the mold groove 5011 through air holes B and A. This accelerates the cooling speed of the plastic sheet and also assists in demolding the plastic sheet from the mold groove 5011, which is very convenient. Thus, the rapid switching of the reversing solenoid valve 16 facilitates the molding and demolding of the plastic sheet.

[0038] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the design concept of the present invention should be included within the protection scope of the present invention.

Claims

1. A mold forming device of a blister packaging machine, comprising a web roll (1), a sheet material pulling mechanism (2), a heating mechanism (3), and a forming mechanism (4), characterized in that: The forming mechanism (4) includes a lower die seat (5) and an upper die seat (6), the lower die seat (5) includes a die plate (501) and a ventilation chamber (502), the die plate (501) is provided with a plurality of die grooves (5011), the bottom and the side wall of the die groove (5011) are respectively provided with a gas hole A (7) and a gas hole B (8), the gas hole A (7) and the gas hole B (8) are communicated with the ventilation chamber (502); the gas hole A (7) is provided with a telescopic rod (14), the telescopic rod (14) is provided with a sealing end face (701) corresponding to the gas hole A (7) and a closing plate (801) corresponding to the gas hole B (8), the telescopic rod (7) has a first state and a second state; In the first state, the sealing end face (701) is separated from the gas hole A (7), and the closing plate (801) is matched with the gas hole B (8); In the second state, the sealing end face (701) is matched with the gas hole A (7), and the closing plate (801) is separated from the gas hole B (8); The side wall of the die groove (5011) is provided with a groove (10), the position of the groove (10) corresponds to the position of the gas hole B (8), the groove (10) is provided with a baffle (11), the surface of the baffle (11) is flush with the surface of the side wall of the die groove (5011), and the baffle (11) and the groove (10) form an air gap (12); The gas hole B (8) is provided with a pressing inclined plate (802), and the closing plate (801) is provided with an inclined surface structure matched with the pressing inclined plate (802).

2. A blister pack machine die forming apparatus according to claim 1 wherein: The heating mechanism (3) and the forming mechanism (4) are provided with a heat preservation mechanism (9), the heat preservation mechanism (9) includes a heat preservation chamber (901), an air inlet fan (902) and an air outlet fan (903), the heating mechanism (3) includes a gas guide piece (301) located on the side of the heating mechanism and a gas guide channel (302) located in the heating mechanism, the heating mechanism (3) is provided with a gas guide hole (3021) communicated with the gas guide channel (302) on the side wall, the gas guide hole (3021) is located on the lower side of the gas guide piece (301), the air inlet fan (902) is communicated with the gas guide channel (302) and the heat preservation chamber (901), and the air outlet fan (903) is communicated with the heat preservation chamber (901) and an external waste gas treatment device.

3. A blister pack machine die forming apparatus according to claim 2 wherein: The heating mechanism (3) is provided with an electric heating plate (303), the gas guide channel (302) is located on the upper part of the electric heating plate (303), the electric heating plate (303) is provided with a heat dissipation fin (3031), and the heat dissipation fin (3031) extends into the gas guide channel (302).

4. A blister pack machine die forming apparatus according to claim 2 wherein: The gas guide piece (301) is inclinedly arranged from bottom to top to one side of the gas guide channel (302).

5. A blister pack machine die forming apparatus as defined in claim 1 wherein: The groove and the baffle are arranged in an upper and lower extending strip structure.

6. A blister pack machine die forming apparatus as defined in claim 1 wherein: The gas hole A (7) is provided with a groove B (13), the sealing end face (701) is matched with the groove B (13), so that in the second state, the surface of the sealing end face (701) is flush with the surface of the bottom of the die groove (5011).

7. A blister pack machine die forming apparatus as defined in claim 1 wherein: The sealing end face (701) is provided with a spring between the mold groove (5011); the other end of the telescopic rod (14) opposite the sealing end face (701) is provided with a limiting end face (1401), and the limiting end face (1401) is matched with the bottom of the mold groove (5011).

8. A blister pack machine die forming apparatus as defined in claim 1 wherein: Further comprising a gas pump mechanism (15) and a reversing electromagnetic valve (16), the gas pump mechanism (15) comprises an inflation pump (1501) and a negative pressure pump (1502), the inflation pump (1501) and the negative pressure pump (1502) are connected with the reversing electromagnetic valve (16), the reversing electromagnetic valve (16) is connected with the air chamber (502), and the inflation pump or the negative pressure pump is connected with the air chamber through the action of the reversing electromagnetic valve (16).

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