Bottom mold device for a turnover mold mechanism of a plastic product thermoforming machine

Abstract

The bottom mold device of the turnover mold mechanism of the plastic product hot forming machine is characterized in that a cup bottom core mold is arranged at the middle position of the cup body cavity cylinder mold, the top of the cup bottom core mold is a cup bottom forming matching surface, a gas hole is further arranged on the cup bottom forming matching surface, the cup bottom core mold is further connected with a water cooling channel, the cup bottom core mold is arranged on a lifting cup pushing rod, a water receiving passage is arranged on the lifting cup pushing rod, the water receiving passage is communicated with the water cooling channel, a gas receiving passage is arranged on the lifting cup pushing rod, and the gas receiving passage is communicated with the gas hole on the cup bottom forming matching surface. The cup bottom core mold can be independently and relatively lifted and matched to be demolded in the cup body cavity cylinder mold, the plastic cup body can be sucked to avoid displacement and falling off in the demolding process to affect the demolding stability under the condition of ventilation by using the gas hole on the cup bottom forming matching surface, the water cooling channel is used for cooling and cooling the plastic cup bottom part in the forming process, the forming efficiency is improved, the service life and the forming effect are improved, the lifting action of the cup bottom core mold and the cooling function and the gas path of the gas hole are matched by the lifting cup pushing rod.

Description

Technical Field

[0001] This utility model relates to the bottom mold device of the flipping mold mechanism of a plastic product thermoforming machine. Background Technology

[0002] In the process of manufacturing plastic products (such as plastic cups), the flipping mold mechanism of a plastic thermoforming machine needs to form the heated sheet material. After forming, the cup is output for demolding. The demolded cup is then received by a cup receiving mechanism for subsequent operations (such as stacking cups). If the demolding and transfer are not smooth, it will cause the cup to shift or fall off, affecting normal operation. In addition, the bottom of the cup will have a shape and some markings (such as logos). The cup forming process must ensure that the bottom shape and logo are clearly and completely formed to ensure that the overall cup is formed properly. Utility Model Content

[0003] In view of the technical problems existing in the background art, the present invention aims to provide a bottom mold device for a flipping mold mechanism of a thermoforming machine for plastic products that improves the bottom forming effect of the cup during the molding process and enhances the demolding stability.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: the bottom mold device of the flipping mold mechanism of the plastic product thermoforming machine includes a cup bottom core mold disposed in the middle position of the cup body cavity mold, characterized in that: the top of the cup bottom core mold is the cup bottom forming mating surface, the cup bottom forming mating surface is also provided with air holes, the cup bottom core mold is also connected to a water cooling channel, the cup bottom core mold is connected and installed on the lifting cup push rod, the lifting cup push rod is provided with a water receiving passage, the water receiving passage is connected to the water cooling channel, the lifting cup push rod is provided with an air receiving passage, the air receiving passage is connected to the air holes on the cup bottom forming mating surface.

[0005] The following optimizations or supplementary explanations can be made to the above technical solutions.

[0006] For example, the bottom of the cup bottom core mold has a connecting hole, which is fitted and installed on the upper end of the lifting cup push rod; the air inlet is located on the axial position of the lifting cup push rod, and the air inlet is axially arranged on the lifting cup push rod. The cup bottom core mold has an air channel, and the air inlet is connected to the air hole on the cup bottom forming mating surface through the air channel; the air channel has an air inlet, which is located on the upper side of the connecting hole and on the axial position of the cup bottom core mold. The air inlet is aligned and connected with the air inlet; the water cooling channel includes an annular groove, which is located on the cup bottom core mold and on the upper side of the connecting hole. The annular groove is centered on the axis of the cup bottom core mold, and the cup bottom core mold and the lifting cup push rod are coaxially arranged. The opening of the annular groove faces the lower lifting cup push rod; the water inlet includes an inlet and an outlet, which are located inside the lifting cup push rod. The inlet and outlet are axially arranged and located on the side of the air inlet, and the upper ends of the inlet and outlet are connected to the upper annular groove.

[0007] For example, the cup bottom core mold is threaded onto the upper end of the lifting cup push rod; the connecting hole is a threaded hole, and the upper end of the lifting cup push rod is provided with an external thread.

[0008] The upper side wall of the connecting hole and the upper side wall of the cup lifting rod are provided with a first sealing ring, and the upper side wall of the connecting hole and the top surface of the cup lifting rod are provided with a second sealing ring. The water inlet and water outlet are located outside the second sealing ring.

[0009] In addition, the lower end of the lifting cup pusher is set on the lifting lower base plate. The cup body cavity mold is connected and installed on the lower template, which is installed on the flipping mold body. The flipping mold body is also equipped with a guide rod, and the lower base plate is positioned on the guide rod. The flipping mold body is also equipped with a lifting drive cylinder, which is connected to the lower base plate for transmission. The air hole adopts a suction-blowing switching type, which includes a blowing state and a suction state.

[0010] The beneficial effects of this utility model are as follows: In the bottom mold device of the flipping mold mechanism of the plastic thermoforming machine, the cup bottom core mold can be independently lifted (i.e., moved axially) in the cup body cavity mold to cooperate with demolding. It can also use the air holes on the cup bottom forming mating surface to suck the plastic cup body to prevent displacement and fall off during demolding, thus affecting demolding stability. In addition, the cup bottom core mold also has a water cooling channel for cooling and cooling the bottom of the plastic cup during the molding process, which facilitates rapid cup bottom molding, improves efficiency, increases the service life of the cup bottom core mold and the cup bottom molding effect. The lifting action, cooling function and air passage of the cup bottom core mold are all coordinated by the lifting cup push rod, making the structure relatively more compact. Attached Figure Description

[0011] The following description, in conjunction with the accompanying drawings, details the embodiments and working principles of this utility model.

[0012] Figure 1 This is a schematic diagram of the structure of this utility model.

[0013] Figure 2 for Figure 1 Sectional view of AA.

[0014] Figure 3 This is a cross-sectional view of the cup bottom core mold and the lifting cup pusher rod of this utility model.

[0015] Figure 4 for Figure 3 A cross-sectional view of the bottom core mold of the middle cup separated from the lifting cup push rod.

[0016] In the picture: 1. Cup body cavity mold; 2. Cup bottom core mold; 20. Cup bottom forming mating surface; 21. Air pore; 22. Water cooling channel; 23. Connecting hole; 24. Air channel; 25. Air inlet; 26. Annular groove; 3. Lifting cup pusher; 31. Water inlet passage; 32. Gas inlet passage; 33. Water inlet passage; 34. Water outlet passage; 41. First sealing ring; 42. Second sealing ring; 5. Bottom plate; 6. Download the template; 70. Guide rod. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the implementation of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0018] Referring to the accompanying drawings, in this embodiment, the bottom mold device of the flipping mold mechanism of the plastic thermoforming machine includes a cup bottom core mold 2 disposed in the middle of the cup body cavity mold 1 (usually a cylindrical structure). The cup bottom core mold 2 is located at the center of the cup body cavity mold 1 and moves up and down to cooperate with the thermoforming of the plastic cup, etc. The top of the cup bottom core mold 2 is a cup bottom forming mating surface 20, which can adapt to the shape and pattern of the bottom of the plastic cup to cooperate with the cup bottom forming. The cup bottom forming mating surface 20 is also provided with air holes 21, which can suck up the plastic cup in the suction state, so that the plastic cup can be thermoformed. During the demolding process (detachment from the cup body cavity mold 1) when the cup is ejected from the cup body core mold 2, it can be held in place to prevent the plastic cup from shifting or falling off during demolding. In addition, the cup bottom core mold 2 is also connected to a water cooling channel 22, which can cool the temperature of the cup bottom core mold 2. Cooling is beneficial to extending the service life of the cup bottom core mold 2 and can also improve the cup bottom forming effect, making the cup bottom shape, logo, etc. clearer and more complete. The cup bottom core mold 2 is connected and installed on the lifting cup push rod 3, which drives the cup bottom core mold 2 to move up and down relative to each other.

[0019] The lifting pusher rod 3 not only drives the cup bottom core mold 2 to move up and down (i.e., axially) within the cup body cavity mold 1, but also provides a water inlet passage 31 and an air inlet passage 32. The water inlet passage 31 is connected to the water cooling channel 22 to allow cooling liquid to be connected to the water cooling channel 22 for cooling. The air inlet passage 32 is connected to the air hole 21 on the cup bottom forming mating surface 20 to allow gas to be connected to the air hole 21 for adsorption of the plastic cup. The mating structure is relatively more compact.

[0020] In the bottom mold device of the flipping mold mechanism of the plastic thermoforming machine, the cup bottom core mold 2 can be independently lifted (i.e., moved axially) in the cup body cavity mold 1 for demolding. It can also use the air holes 21 on the cup bottom forming mating surface 20 to hold the plastic cup body in place when air is supplied, so as to prevent displacement and fall off during demolding and affect demolding stability. In addition, the cup bottom core mold 2 also has a water cooling channel 22 for cooling and cooling the bottom of the plastic cup during the molding process, which facilitates rapid molding of the cup bottom, improves efficiency, and increases the service life of the cup bottom core mold 2 and the molding effect of the cup bottom. The lifting action, cooling function and air passage of the air holes 21 of the cup bottom core mold 2 are all coordinated by the lifting push cup rod 3, and the structure is relatively more compact.

[0021] The following optimizations or further explanations can be made based on the above embodiments.

[0022] For example, the bottom of the cup bottom core mold 2 has a connecting hole 23, which is used to fit and connect to the upper end of the lifting cup push rod 3 for easy assembly. The air inlet passage 32 is located on the axial position of the lifting cup push rod 3. The air inlet passage 32 is axially arranged on the lifting cup push rod 3. Typically, the lifting cup push rod 3 is a round rod, and the air inlet passage 32 is located at the central axis of the round rod. The cup bottom core mold 2 has an air channel 24 (which can be machined by drilling, and the port can be sealed with a plug). The air inlet passage 32 is connected to the air hole 21 on the cup bottom forming mating surface 20 through this air channel 24. The air channel 24 has an air inlet 25, which is located above the connecting hole 23. The air inlet 25 is positioned on the axis of the cup bottom core mold 2. The air inlet 25 is aligned and connected to the air inlet passage 32, using an axis-aligned connection. After the cup bottom core mold 2 is connected and assembled with the lifting cup push rod 3, the air inlet 25 and air inlet passage 32 can be aligned to achieve airflow. Additionally, the water cooling channel 22 includes an annular groove 26 located on the cup bottom core mold 2. The annular groove 26 is positioned above the connecting hole 23, centered on the axis of the cup bottom core mold 2. The cup bottom core mold 2 and the lifting cup push rod 3 are coaxially aligned. The annular groove 26 has an opening facing downwards on the lifting cup pusher rod 3. The water receiving passage 31 includes a water inlet 33 and a water outlet 34, which are located inside the lifting cup pusher rod 3. The water inlet 33 and water outlet 34 are axially arranged and located to the side of the air receiving passage 32. The air receiving passage 32 is located on the axis of the lifting cup pusher rod 3 (such as the center axis of the round rod). The water inlet 33 and water outlet 34 are located to the side of the air receiving passage 32. The water inlet 33 and water outlet 34 are located on the center axis of the air receiving passage 32. The axes are aligned, such as being set vertically, along the length of the lifting cup push rod 3; and the upper ports of the water inlet 33 and the water outlet 34 are respectively connected to the upper annular groove 26. In this structure, after the cup bottom core mold 2 and the lifting cup push rod 3 are connected and assembled, the water inlet 33 and the water outlet 34 can be connected to the annular groove 26 to achieve water circulation. Coolant enters the annular groove 26 from the water inlet 33, and after the cup bottom core mold 2 is cooled by the annular groove 26, the coolant in the annular groove 26 is then output from the water outlet 34 to facilitate water flow.

[0023] For example, the cup bottom core mold 2 is threaded onto the upper end of the lifting cup push rod 3; the connecting hole 23 is a threaded hole, and the upper end of the lifting cup push rod 3 is provided with external threads. The threaded connection structure technology is relatively mature and easy to process and assemble. In addition, a first sealing ring 41 is provided between the outer ring of the lifting cup push rod 3 and the inner ring of the connecting hole 23 to ensure that water leakage is prevented; a second sealing ring 42 is provided between the upper side wall of the connecting hole 23 and the top surface of the lifting cup push rod 3. The water inlet 33 and the water outlet 34 are located outside the second sealing ring 42, separating the air path from the water path and ensuring that water and air leakage is prevented.

[0024] It can be further optimized. The cup body cavity mold 1 is connected and installed on the lower template 6. The lower template 6 is installed on the flip mold body (not shown in the figure). Usually, the lifting cup push rod 3 is arranged on the flip mold body. For example, the lower end of the lifting cup push rod 3 is set on the lifting lower base plate 5. The flip mold body is also provided with a guide rod 70. The lower base plate 5 is arranged on the guide rod 70. The guide rod 70 guides the lower base plate 5 to move up and down, so that the lifting cup push rod 3 moves up and down stably. The flip mold body is also provided with a lifting drive cylinder (not shown in the figure). The lifting drive cylinder is connected to the lower base plate 5. The lifting drive cylinder drives the lower base plate 5 to move up and down and drives the lifting cup push rod 3 to move up and down together.

[0025] The air vent 21 is a suction-blowing switching type, which includes both blowing and suction modes. The air vent 21 can switch between suction and suction modes, allowing it to work in conjunction with suction to hold the plastic cup in place during demolding, preventing it from falling off or shifting. It can also work in conjunction with blowing to release the plastic cup at the end of demolding, preventing it from sticking or getting stuck. The lower base plate 5 can have built-in air and water channels (processed by slotting or drilling) to connect to the air inlet channel 32 and water inlet channel 31 (such as water inlet channel 33 and water outlet channel 34) in the lifting cup pusher rod 3. Alternatively, external pipes can be used for connecting external air and water channels.

Claims

1. A bottom mold device for a flipping mold mechanism of a plastic product thermoforming machine, comprising a cup bottom core mold (2) disposed in the middle of a cup body cavity mold (1), characterized in that: The top of the cup bottom core mold (2) is the cup bottom forming mating surface (20), and the cup bottom forming mating surface (20) is also provided with air holes (21). The bottom core mold (2) is also connected to a water cooling channel (22). The cup bottom core mold (2) is connected and installed on the lifting cup push rod (3). The lifting cup push rod (3) is provided with a water inlet passage (31), which is connected to the water cooling channel (22). The lifting cup push rod (3) is provided with an air inlet passage (32), which is connected to the air hole (21) on the cup bottom forming mating surface (20).

2. The bottom mold device of the flipping mold mechanism of the plastic product thermoforming machine as described in claim 1, characterized in that: The bottom of the cup bottom core mold (2) has a connecting hole (23), which is fitted and connected to the upper end of the lifting cup push rod (3); The air inlet passage (32) is located on the axis of the lifting cup pusher rod (3), and the air inlet passage (32) is axially arranged on the lifting cup pusher rod (3). An air channel (24) is provided inside the cup bottom core mold (2), and the air inlet passage (32) is connected to the air hole (21) on the cup bottom forming mating surface (20) through the air channel (24); The air passage (24) has an air inlet (25), which is located on the upper side of the connecting hole (23). The air inlet (25) is located on the axial position of the cup bottom core mold (2). The air inlet (25) is aligned and connected with the air passage (32). The water cooling channel (22) includes an annular groove (26), which is located on the bottom mold (2) of the cup. The annular groove (26) is set on the upper side of the connecting hole (23). The annular groove (26) is centered on the axis of the bottom mold (2). The bottom mold (2) of the cup is coaxial with the lifting push rod (3). The opening of the annular groove (26) faces the lifting push rod (3) downward. The water inlet passage (31) includes an inlet passage (33) and an outlet passage (34). The inlet passage (33) and the outlet passage (34) are located inside the lifting cup pusher (3). The inlet passage (33) and the outlet passage (34) are respectively axially arranged and located on the side of the air inlet passage (32). The upper ports of the inlet passage (33) and the outlet passage (34) are respectively connected to the annular groove (26) above.

3. The bottom mold device of the flipping mold mechanism of the plastic product thermoforming machine as described in claim 2, characterized in that: The cup bottom core mold (2) is threaded onto the upper end of the lifting cup push rod (3); the connecting hole (23) is set as a threaded hole, and the upper end of the lifting cup push rod (3) is provided with an external thread.

4. The bottom mold device of the flipping mold mechanism of the plastic product thermoforming machine as described in claim 2, characterized in that: A first sealing ring (41) is provided between the outer ring of the lifting cup push rod (3) and the inner ring of the connecting hole (23), and a second sealing ring (42) is provided between the upper side wall of the connecting hole (23) and the top surface of the lifting cup push rod (3). The water inlet (33) and the water outlet (34) are located outside the second sealing ring (42).

5. The bottom mold device of the flipping mold mechanism of the plastic product thermoforming machine as described in claim 1, characterized in that: The lower end of the lifting cup push rod (3) is set on the lifting lower base plate (5), the cup body cavity cylinder mold (1) is connected and installed on the lower template (6), and the lower template (6) is installed on the flipping mold body. The flipping mold body is also provided with a guide rod (70), and the bottom plate (5) is arranged on the guide rod (70). The flipping mold body is also provided with a lifting drive cylinder, which is connected to the bottom plate (5) in a transmission.

6. The bottom mold device of the flipping mold mechanism of the plastic product thermoforming machine as described in claim 1, characterized in that: The air vent (21) is a blow-suction switching air vent (21), which includes a blowing state and a suction state.

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