Blister machine for the processing of moulded trays

Abstract

This invention relates to the field of plastic waste recycling technology, and provides a vacuum forming machine for processing molded trays, including a processing table and a vacuum forming mold; the vacuum forming mold is placed on the top of the processing table, and a vacuum forming sheet is placed on the top of the vacuum forming mold; a fixing frame is fixed to the rear end of the top of the processing table, and a cylinder is installed on the top of the fixing frame; a cutting structure is provided on the outer side of the upper mold. This invention achieves multi-stage sequential cutting by using a first coarse cutter, a second fine cutter, and a third trimming cutter arranged sequentially from the outside in, thus significantly reducing the resistance of single-stage cutting and avoiding problems such as incomplete cutting, tearing, rough edges, and edge chipping; the cutting is flat and the impact is small, preventing the mold from loosening and causing air leakage; the finished tray has smooth edges, rounded corners without sharp edges, and can be formed immediately after cutting, eliminating the need for subsequent manual trimming and polishing processes, reducing labor costs, and improving processing efficiency.

Description

Technical Field

[0001] This invention relates to the field of plastic waste recycling technology, and in particular to a vacuum forming machine for processing molded trays. Background Technology

[0002] With the increasingly widespread application of polymer plastic products, the amount of waste plastic and production scrap generated in the industry continues to increase. Plastic has the characteristic of being difficult to degrade naturally. The accumulation and landfill of large amounts of waste plastic will damage the soil and ecological environment, bringing serious white pollution problems. Therefore, achieving efficient recycling and reuse of plastic waste is of great significance to environmental protection and resource conservation. Therefore, plastic waste is recycled and reused in the actual production process. Plastic pallet production often involves recycling plastic waste. A vacuum forming machine is used to process these pallets through heating and vacuum forming. However, traditional vacuum forming machines have drawbacks. During production, scraps and rough edges are generated, requiring additional trimming by workers after vacuum forming. This increases labor costs and reduces production efficiency. Therefore, a vacuum forming machine specifically designed for vacuum forming pallets is needed to address these issues. Summary of the Invention

[0003] The purpose of this invention is to provide a vacuum forming machine for processing molded pallets, which solves the problem that existing vacuum forming machines for processing molded pallets require workers to trim the edges and corners after the plastic pallet vacuum forming process is completed, which not only increases labor costs but also reduces production efficiency.

[0004] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a vacuum forming machine for processing molded trays, comprising a processing table and a vacuum forming mold; the vacuum forming mold is placed on the top of the processing table, a vacuum forming sheet is placed on the top of the vacuum forming mold, a fixing frame is fixed to the rear end of the top of the processing table, a cylinder is installed on the top of the fixing frame, a connecting block is installed at the bottom of the cylinder, an upper mold is provided at the bottom of the connecting block, and a cutting structure is provided on the outer side of the upper mold; The cutting structure includes a mounting frame, which is installed on both sides of the upper mold. A gear is installed in the middle of the mounting frame, and ratchet teeth are installed at both ends of the gear. A rotating shaft is installed at one end of the ratchet teeth. An extrusion plate is installed on one side of the gear, and an extrusion block is installed at the bottom end of the extrusion plate. A first cutting blade is installed on the outer side of the upper mold, a second cutting blade is installed on the inner side of the first cutting blade, and a third cutting blade is installed on the inner side of the second cutting blade. A pressure block is installed at the top of each of the first, second, and third cutting blades.

[0005] Preferably, a support frame is installed at the top of the mounting frame, a fourth spring is installed at the top of the extrusion plate, the top of the fourth spring is connected to the bottom of the support frame, and the fourth spring and the support frame form a telescopic structure. A guide rod is installed at the top of the extrusion plate, the top of the guide rod passes through the top of the support frame, and the guide rod and the support frame form a guiding connection.

[0006] Preferably, a guide block is installed on one side of the bottom end of the mounting frame, and a first spring is installed on one side of the pressing block. The first spring is connected to one side of the mounting frame, and the first spring and one side of the mounting frame form a telescopic structure.

[0007] Preferably, a second spring is installed at the top of the upper mold, the top of the second spring is connected to the bottom of the connecting block, and a guide post is installed at the top of the upper mold, the top of the guide post penetrating the interior of the connecting block.

[0008] Preferably, rack frames are installed on both sides of the upper mold, mounting plates are installed at the front and rear ends of the upper mold, and a plurality of third springs are installed at the bottom of the mounting plates. The plurality of third springs are respectively fixed to the top ends of the first cutting blade, the second cutting blade and the third cutting blade.

[0009] Preferably, the rack frame is provided in two sets, and the two sets of rack frames mesh with the outer side of the ratchet teeth.

[0010] Preferably, the bottom end of the extrusion plate is provided with an angle, and one side of the extrusion block is provided with a matching inclined groove, and the extrusion plate and the extrusion block form an extrusion connection.

[0011] Preferably, the front end of the processing table is provided with a heating structure, the heating structure includes a mounting box, the mounting box is installed at the front end of the processing table, a lead screw is installed inside the mounting box, a lead sleeve is installed outside the lead screw, a connecting frame is installed at the top of the lead sleeve, and a heater is installed on one side of the connecting frame.

[0012] Preferably, the lead screw has an external thread on its outer side and the threaded sleeve has an internal thread on its inner side, forming a threaded connection between the threaded sleeve and the lead screw.

[0013] Preferably, a limiting groove is provided at the top of the mounting box, and the connecting bracket is inserted into the limiting groove at the top of the mounting box, forming a guide connection between the connecting bracket and the limiting groove.

[0014] The present invention provides a vacuum forming machine for processing molded trays, the advantages of which are: By incorporating a cutting structure, multi-stage sequential cutting is achieved through a first coarse cutter, a second fine cutter, and a third trimming cutter arranged from the outside in. This multi-stage cutting process significantly reduces single-stage cutting resistance, preventing issues such as incomplete cutting, tearing, rough edges, and chipping. The cutting process minimizes impact and prevents mold loosening that could lead to air leakage. The finished pallet has smooth, flat edges and rounded corners without sharp edges. It can be formed immediately after cutting, eliminating the need for subsequent manual trimming and polishing processes, reducing labor costs, and improving processing efficiency. Furthermore, by setting a second spring between the connecting block and the upper mold, a continuous and stable mold closing and sealing pressure can be applied to the upper mold to ensure reliable mold sealing and stable vacuum forming, while also providing travel clearance space to realize segmented operation of the equipment. Furthermore, through the ratchet and gear one-way transmission structure, the cutting mechanism is driven only during the upward return phase of the connecting block. During the downward movement of the mold closing, the idling does not trigger the cutting, effectively avoiding premature cutting that could damage the mold seal and vacuum forming environment. Furthermore, the overall mechanism is equipped with multiple elastic reset structures, so that each transmission component and cutting tool can be automatically reset after the cutting operation is completed. The mechanism runs smoothly and stably, and can realize continuous automated cycle production, which improves work efficiency. Attached Figure Description

[0015] Figure 1 This is a frontal three-dimensional structural schematic diagram of the present invention; Figure 2 This is a schematic diagram of the three-dimensional structure of the present invention, shown in a partial cross-section. Figure 3 This is a rear-view three-dimensional structural diagram of the present invention; Figure 4 This is a three-dimensional structural diagram of the thermoforming sheet of the present invention, viewed from the front cross-section. Figure 5 This is a frontal three-dimensional structural diagram of the cutting structure of the present invention; Figure 6 This is a three-dimensional structural diagram of the cutting structure of the present invention, viewed from the front cross-section. Figure 7 This is a three-dimensional structural diagram of the cutting structure of the present invention, viewed from below. Figure 8 This is a frontal exploded three-dimensional structural diagram of the cutting structure of the present invention; Figure 9This is a side-view exploded three-dimensional structural diagram of the cutting structure of the present invention; Figure 10 This is a top-down exploded three-dimensional structural diagram of the cutting structure of the present invention.

[0016] The following are the annotations in the diagram: 1. Processing table; 2. Vacuum forming mold; 3. Vacuum forming sheet; 4. Cutting structure; 401. Mounting frame; 402. Support frame; 403. Extrusion block; 404. First spring; 405. Extrusion plate; 406. Rack frame; 407. Guide post; 408. Second spring; 409. First cutting blade; 4010. Third spring; 4011. Mounting plate; 4012. Second cutting blade; 4013. Third cutting blade; 4014. Rotating shaft; 4015. Racket; 4016. Gear; 4017. Guide rod; 4018. Guide block; 4019. Pressure block; 4020. Fourth spring; 5. Fixing frame; 6. Cylinder; 7. Connecting block; 8. Heating structure; 801. Heater; 802. Connecting frame; 803. Mounting box; 804. Lead screw; 805. Lead sleeve; 9. Upper mold. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. 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.

[0018] Please see Figures 1-10 The present invention provides a vacuum forming machine for processing molded trays, comprising a processing table 1 and a vacuum forming mold 2; A vacuum forming mold 2 is placed on the top of the processing table 1, a vacuum forming sheet 3 is placed on the top of the vacuum forming mold 2, a fixing frame 5 is fixed at the rear end of the top of the processing table 1, a cylinder 6 is installed at the top of the fixing frame 5, a connecting block 7 is installed at the bottom of the cylinder 6, an upper mold 9 is set at the bottom of the connecting block 7, and a cutting structure 4 is set on the outside of the upper mold 9. Reference Figures 1-10As shown, a heating structure 8 is provided at the front end of the processing table 1. The heating structure 8 includes a mounting box 803, which is installed at the front end of the processing table 1. A lead screw 804 is installed inside the mounting box 803, and a threaded sleeve 805 is installed on the outside of the lead screw 804. A connecting frame 802 is installed at the top of the threaded sleeve 805, and a heater 801 is installed on one side of the connecting frame 802. The lead screw 804 has an external thread on its outside, and the threaded sleeve 805 has an internal thread on its inside. The threaded sleeve 805 and the lead screw 804 form a threaded connection. A limiting groove is opened at the top of the mounting box 803, and the connecting frame 802 is inserted into the limiting groove at the top of the mounting box 803. The connecting frame 802 and the limiting groove form a guide connection.

[0019] During the thermoforming process of plastic trays, workers place the thermoforming sheet 3, made from recycled plastic waste, onto the top of the thermoforming mold 2. After placement, an external power source starts the motor, driving the lead screw 804 to rotate. During rotation, the lead screw 804, through its interaction with the lead sleeve 805, moves the lead sleeve 805 to one side along the outer side of the lead screw 804. As the lead sleeve 805 moves, it drives the heater 801 to move through the connecting frame 802, moving the heater 801 to the top of the thermoforming mold 2. When the heater 801 reaches the top of the thermoforming mold 2, it is activated to heat the thermoforming sheet 3. The heater 801 is equipped with a temperature sensor to control the heating temperature. After the heater 801 finishes heating the thermoforming sheet 3, the thermoforming sheet 3 softens due to heat. The motor is then restarted to reset the heater 801, completing the heating and softening process of the thermoforming sheet 3.

[0020] Reference Figures 1-10 As shown, the cutting structure 4 includes a mounting frame 401, which is mounted on both sides of the upper mold 9. A gear 4016 is mounted in the middle of the mounting frame 401. A ratchet 4015 is mounted at both ends of the gear 4016. A rotating shaft 4014 is mounted at one end of the ratchet 4015. An extrusion plate 405 is mounted on one side of the gear 4016. An extrusion block 403 is mounted at the bottom end of the extrusion plate 405. A first cutting blade 409 is mounted on the outside of the upper mold 9. A second cutting blade 4012 is provided on the inside of the first cutting blade 409. A third cutting blade 4013 is mounted on the inside of the second cutting blade 4012. A pressure block 4019 is mounted on the top of the first cutting blade 409, the second cutting blade 4012 and the third cutting blade 4013. A support frame 402 is installed at the top of the mounting bracket 401, and a fourth spring 4020 is installed at the top of the extrusion plate 405. The top of the fourth spring 4020 is connected to the bottom of the support frame 402, and the fourth spring 4020 and the support frame 402 form a telescopic structure. A guide rod 4017 is installed at the top of the extrusion plate 405, and the top of the guide rod 4017 passes through the top of the support frame 402. The guide rod 4017 and the support frame 402 form a guide connection. A guide block 4018 is installed on one side of the bottom end of the mounting bracket 401, and a first spring 404 is installed on one side of the pressing block 403. The first spring 404 is connected to one side of the mounting bracket 401, and the first spring 404 and one side of the mounting bracket 401 form a telescopic structure. A second spring 408 is installed at the top of the upper mold 9. The top of the second spring 408 is connected to the bottom of the connecting block 7. A guide post 407 is installed at the top of the upper mold 9. The top of the guide post 407 penetrates the interior of the connecting block 7. The upper mold 9 is equipped with rack frames 406 on both sides, and mounting plates 4011 are installed at the front and rear ends of the upper mold 9. Several third springs 4010 are installed at the bottom of the mounting plates 4011, and the several third springs 4010 are fixed to the top ends of the first cutting blade 409, the second cutting blade 4012 and the third cutting blade 4013 respectively. Two sets of rack frames 406 are provided, and the two sets of rack frames 406 mesh with the outer side of the ratchet 4015. The bottom end of the extrusion plate 405 is provided with an angle, and one side of the extrusion block 403 is provided with a matching inclined groove. The extrusion plate 405 and the extrusion block 403 form an extrusion connection.

[0021] After the blister sheet 3 has been heated and softened, a vacuum pump is connected to the connecting pipe at the bottom of the blister mold 2 to perform vacuum forming. During vacuum forming, the cylinder 6 is activated to push the connecting block 7 downward, thereby indirectly driving the upper mold 9 downward to perform a molding process on the blister sheet 3. When the bottom of the upper mold 9 contacts the top of the blister sheet 3, the outer side of the blister sheet 3 is first squeezed and sealed. Then, during the molding process, vacuum forming is performed through the blister mold 2, thus completing the molding and vacuum forming of the blister sheet 3. The effect of molding and vacuum forming can make the sheet wall thickness distribution uniform, effectively improving the forming defects such as warping, deformation, and shrinkage that are prone to occur in single blister forming, and making the finished product more dimensionally accurate. When the upper mold 9 completes the molding process, the cylinder 6 will push the connecting block 7 downwards. As the connecting block 7 moves downwards, it will compress the second spring 408, causing it to contract. The second spring 408 not only maintains the sealing pressure of the upper mold 9 but also provides a clearance stroke for the connecting block 7 through its contraction. As the connecting block 7 moves downwards, it will drive the rack 406 downwards. During this downward movement, the rack 406 will engage with the ratchet 4015, causing the ratchet 4015 to idle. After the molding of the vacuum forming sheet 3 is completed, the cylinder 6 drives the connecting block 7 upwards. The distance the connecting block 7 moves is exactly the clearance stroke caused by the contraction of the second spring 408. When moving upward, the support frame 402 drives the ratchet 4015 to rotate. The rotating extrusion plate 405 drives the gear 4016 to rotate. During rotation, the gear 4016 engages with the teeth on one side of the extrusion plate 405, causing the extrusion plate 405 to move downward. As the extrusion plate 405 moves downward, it presses the inclined groove on one side of the extrusion block 403 at its bottom angle, causing the extrusion block 403 to move to one side. As the extrusion block 403 moves to one side, it sequentially presses the pressure blocks 4019 at the top of the first cutting blade 409, the second cutting blade 4012, and the third cutting blade 4013, causing them to move downward in sequence, thus trimming the edges and corners of the blister sheet 3. The process involves three main steps: First, the outermost 409 primary coarse cutter is compressed and pressed down, removing a large area of ​​rectangular edge waste. This cutter is thick and has a heavy-duty shearing edge. Second, the middle layer of the 4012 secondary fine cutter is compressed and pressed down, trimming the rough cut surface and cutting to the standard tray dimensions. This cutter has a thin and sharp edge. Third, the innermost 4013 tertiary trimming cutter is compressed and pressed down last, trimming edge burrs and sharp corners to create rounded edges. This process achieves the cutting of the three corners of the blister pack. Compared to traditional methods that cut all the thick edge waste in one go, which often result in extremely high shearing resistance, insufficient cutting force leading to incomplete cuts, blade dragging, and tearing of the sheet material, this method produces a rough cut surface, large burrs, edge chipping, and corner damage, with significant cutting impact and vibration. The previous method easily caused the mold to back up, resulting in slight loosening of the upper mold, damaging the mold seal and causing vacuum leakage. Even after cutting, a large amount of burrs remained, requiring subsequent manual trimming and polishing, making the process tedious. This method involves multiple cutting and grading processes: rough cutting to remove large pieces, fine cutting to smooth the contours, and rounding the edges. The finished product has smooth, flat edges, regular dimensions, and rounded corners without sharp edges. The finished product is ready immediately after cutting, completely eliminating the need for subsequent manual trimming and polishing, saving labor and improving processing efficiency. After cutting, the connecting block 7 completes the travel of the second spring 408, then lifts the upper mold 9 to complete the molding and vacuum forming of the blister sheet 3. When the connecting block 7 returns to its original position, the fourth spring 4020 pulls the extrusion plate 405 back to its original position.Because the rotating shaft 4014 is internally and movably connected to the support frame 402, the gear 4016 will idle when the extrusion plate 405 returns to its original position. After the extrusion plate 405 returns to its original position, the extrusion block 403 will be pulled back to its original position under the action of the first spring 404. After the extrusion block 403 returns to its original position, the first cutting blade 409, the second cutting blade 4012, and the third cutting blade 4013 will return to their original positions under the action of the third spring 4010, facilitating the next cutting operation and ultimately completing the molding and blister trimming of the plastic tray.

[0022] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A vacuum forming machine for processing molded trays, comprising a processing table (1) and a vacuum forming mold (2); Its features are: A vacuum forming mold (2) is placed on the top of the processing table (1), a vacuum forming sheet (3) is placed on the top of the vacuum forming mold (2), a fixing frame (5) is fixed at the rear end of the top of the processing table (1), a cylinder (6) is installed on the top of the fixing frame (5), a connecting block (7) is installed at the bottom of the cylinder (6), an upper mold (9) is provided at the bottom of the connecting block (7), and a cutting structure (4) is provided on the outside of the upper mold (9). The cutting structure (4) includes a mounting bracket (401), which is mounted on both sides of the upper mold (9). A gear (4016) is mounted in the middle of the mounting bracket (401). A ratchet (4015) is mounted on both ends of the gear (4016). A rotating shaft (4014) is mounted on one end of the ratchet (4015). An extrusion plate (405) is mounted on one side of the gear (4016). An extrusion block (403) is mounted on the bottom end of the extrusion plate (405). A first cutting blade (409) is mounted on the outside of the upper mold (9). A second cutting blade (4012) is provided on the inside of the first cutting blade (409). A third cutting blade (4013) is mounted on the inside of the second cutting blade (4012). A pressure block (4019) is mounted on the top of each of the first cutting blade (409), the second cutting blade (4012), and the third cutting blade (4013).

2. The vacuum forming machine for processing molded trays according to claim 1, characterized in that: A support frame (402) is installed at the top of the mounting bracket (401), and a fourth spring (4020) is installed at the top of the extrusion plate (405). The top of the fourth spring (4020) is connected to the bottom of the support frame (402), and the fourth spring (4020) and the support frame (402) form a telescopic structure. A guide rod (4017) is installed at the top of the extrusion plate (405), and the top of the guide rod (4017) passes through the top of the support frame (402). The guide rod (4017) and the support frame (402) form a guiding connection.

3. A vacuum forming machine for processing molded trays according to claim 1, characterized in that: A guide block (4018) is installed on one side of the bottom end of the mounting bracket (401), and a first spring (404) is installed on one side of the pressing block (403). The first spring (404) is connected to one side of the mounting bracket (401), and the first spring (404) and one side of the mounting bracket (401) form a telescopic structure.

4. A vacuum forming machine for processing molded trays according to claim 1, characterized in that: The top of the upper mold (9) is equipped with a second spring (408), the top of the second spring (408) is connected to the bottom of the connecting block (7), and the top of the upper mold (9) is equipped with a guide post (407), the top of the guide post (407) penetrates the interior of the connecting block (7).

5. A vacuum forming machine for processing molded trays according to claim 1, characterized in that: The upper mold (9) is equipped with racks (406) on both sides, and mounting plates (4011) are installed at the front and rear ends of the upper mold (9). Several third springs (4010) are installed at the bottom of the mounting plates (4011), and the several third springs (4010) are respectively fixed to the top ends of the first cutting blade (409), the second cutting blade (4012) and the third cutting blade (4013).

6. A vacuum forming machine for processing molded trays according to claim 5, characterized in that: The rack frame (406) is provided in two sets, and the two sets of rack frames (406) mesh with the outer side of the ratchet (4015).

7. A vacuum forming machine for processing molded trays according to claim 1, characterized in that: The bottom end of the extrusion plate (405) is provided with an angle, and one side of the extrusion block (403) is provided with a matching inclined groove, and the extrusion plate (405) and the extrusion block (403) form an extrusion connection.

8. A vacuum forming machine for processing molded trays according to claim 1, characterized in that: The front end of the processing table (1) is provided with a heating structure (8). The heating structure (8) includes a mounting box (803). The mounting box (803) is installed at the front end of the processing table (1). A lead screw (804) is installed inside the mounting box (803). A threaded sleeve (805) is installed on the outside of the lead screw (804). A connecting frame (802) is installed at the top of the threaded sleeve (805). A heater (801) is installed on one side of the connecting frame (802).

9. A vacuum forming machine for processing molded trays according to claim 8, characterized in that: The lead screw (804) has an external thread on its outer side, and the thread sleeve (805) has an internal thread on its inner side, forming a threaded connection between the thread sleeve (805) and the lead screw (804).

10. A vacuum forming machine for processing molded trays according to claim 8, characterized in that: The top of the mounting box (803) has a limiting groove, and the connecting frame (802) is inserted into the limiting groove at the top of the mounting box (803). The connecting frame (802) and the limiting groove form a guide connection.

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