Paper plastic product forming equipment

Abstract

The present invention relates to the technical field of paper plastic product production and processing, specifically a paper plastic product forming device, comprising a support frame fixedly mounted on a base, a workbench fixedly mounted on the base, and the workbench is located between the base and the support frame, a hydraulic press fixedly mounted in the middle of the support frame, a punch fixedly mounted on the lower end of the telescopic rod at the output end of the hydraulic press, a hot pressing upper die fixedly mounted on the left side of the lower end of the punch, and a blanking upper die fixedly mounted on the right side of the lower end of the punch, a hot pressing lower die fixedly mounted on the workbench that matches the hot pressing upper die, and the upper surface of the workbench is flush with the upper surface of the hot pressing lower die, a blanking groove is provided on the workbench, and a blanking tool matching the blanking upper die is fixedly mounted on the bottom wall of the blanking groove. The present invention drives the sprocket to rotate through a transmission device to drive the movement of the conveyor belt, sets the paper movement distance from the hot pressing processing position to the blanking processing position, and stabilizes the paper movement distance.

Description

Technical Field

[0001] The present invention relates to the technical field of paper plastic product production and processing, in particular to paper plastic product forming equipment. Background Art

[0002] With factors such as environmental pollution, climate change, and energy shortages, modern people mostly choose to buy products that are environmentally friendly, pollution-free, and reusable. Plastic products have a great impact on environmental pollution. Due to the environmental protection, pollution-free, and reusable characteristics of paper plastic products, paper plastic has become one of the most popular packaging materials. Paper plastic is often used in lunch boxes. In the production process of paper plastic lunch boxes, thermoforming equipment is an important part of the processing equipment used.

[0003] The process comprises hot pressing equipment, a hot pressing die, and a punching die. In the prior art, paper is first fed into the hot pressing die via a conveyor belt for stamping and forming, then fed into the punching die for punching and shearing, and the formed paper plastic product is cut from the paper blank to obtain a finished product. The conveyor belt transports the paper, and the hot pressing die and the punching die operate independently, requiring very high coordination accuracy. In the prior art, numerous complex electronic devices, such as stepper motors and detection circuits, are required to coordinate the operation of the various hot pressing devices. The related equipment in small and medium-sized factories is outdated and difficult to maintain effectively, resulting in generally poor coordination accuracy, which may result in poor overall accuracy when transporting paper on the conveyor belt, leading to skewed or misaligned punching, which significantly affects the aesthetics of the finished paper plastic tableware. Furthermore, the heater of the existing hot pressing die may cause uneven temperatures in various parts of the paper after prolonged operation. When the hot pressing die with uneven temperatures heats the paper at different locations, causing different expansion degrees in the contacting paper, which in turn causes wrinkles in the paper plastic, affecting the aesthetics of the formed paper plastic product and even increasing the scrap rate and cost.

[0004] Therefore, a paper plastic product forming device is proposed. Summary of the Invention

[0005] The purpose of the present invention is to provide a paper plastic product forming device, which uses a transmission device to limit the moving distance of the conveyor belt each time, stabilizes the paper moving distance and links a constant temperature heating mechanism to maintain the temperature of the hot pressing mold to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] The top of described sliding panel also is provided with an interlocking structure, and the interlocking structure is, for example, that orientated towards the side of sliding panel withstands on the back of the interlocking structure, and the bottom of described interlocking structure is equipped with a toothed structure.

[0008] Also includes:

[0009] a transmission device, wherein one of the sprockets is driven by a hydraulic press through the transmission device;

[0010] A constant temperature heating mechanism is fixedly installed on the lower side of the hot pressing lower die.

[0011] Preferably, the transmission device includes:

[0012] A rack is fixedly mounted on the right side of the outer wall of the telescopic rod;

[0013] Gear, a rotating shaft 1 is rotatably mounted on the support frame, and a gear is fixedly mounted on one end of the rotating shaft 1 located inside the support frame, the gear is located on the right side of the rack, and the gear and the rack are geared with each other;

[0014] Sprocket 1, sprocket 1 is fixedly mounted on one end of the rotating shaft 1 located outside the support frame, and a one-way bearing is mounted on the sprocket 1;

[0015] Rotating shaft 2, the input end of the transmission wheel is fixedly installed with rotating shaft 2, and the end of rotating shaft 2 away from the transmission wheel is fixedly installed with sprocket 2, and the chain is jointly sleeved on sprocket 1 and sprocket 2.

[0016] Preferably, the distances between the plurality of belt slot holes are equal, and the size of the belt slot holes is larger than the size of the hot pressing upper die and the punching upper die.

[0017] Preferably, the conveyor belt is evenly installed with multiple rubber blocks.

[0018] Preferably, the constant temperature heating mechanism includes:

[0019] A heating chamber is provided in the workbench, and the heating chamber is located below the hot pressing lower die. An oil inlet and an oil outlet are provided on the rear side of the workbench, and the oil inlet and the oil outlet extend into the heating chamber;

[0020] A mounting frame is fixedly mounted on the rear side of the support frame, a mounting cover is connected to the top of the mounting frame by a threaded bolt, a piston tube is fixedly mounted in the mounting frame, and a piston is slidably mounted in the piston tube, the piston is driven to move up and down by a driving device, and an oil inlet and an oil outlet are respectively opened at the lower end of the piston tube;

[0021] Oil pipe 1, one side of the oil pipe 1 is connected to the oil outlet, and the side of the oil pipe 1 away from the piston tube is connected to the oil inlet, and a one-way valve 1 is fixedly installed on the oil pipe 1;

[0022] Oil pipe 2, one side of which is connected to the oil inlet, and the side of oil pipe 2 away from the piston tube is connected to the heating box, one-way valve 2 is fixedly installed on oil pipe 2, oil pipe 4 is fixedly installed on the top of the outer wall of the heating box, and one end of oil pipe 4 away from the heating box is fixedly connected to the oil outlet, oil pipe 3 is fixedly installed on the top of the heating box, and an oil pump is fixedly installed on oil pipe 3, oil pipe 3 is inserted into the oil source away from the heating box, and a liquid level control component for controlling the liquid level is fixedly installed in the heating box.

[0023] Preferably, the driving device comprises:

[0024] A push-pull rod is fixedly mounted on the upper end of the piston;

[0025] A sliding hole is provided in the middle of the mounting cover, and the push-pull rod is slidably connected to the sliding hole;

[0026] The mounting rod is fixedly mounted on the punch, a slot is fixedly opened on the support frame, the mounting rod extends to the outside of the support frame through the slot, and the push-pull rod is fixedly mounted on the mounting rod.

[0027] Preferably, the sliding hole is rectangular, and the push-pull rod is a rectangular rod that cooperates with the sliding hole.

[0028] Preferably, the liquid level control assembly includes a support fixedly mounted on the inner wall of the heating box, a slide groove is provided on the support, and a connector 1 is installed in the slide groove, and the connector 1 is electrically connected to the oil pump, a slider in contact with the connector 1 is fixedly mounted in the slide groove, and a float is fixedly mounted on the slider.

[0029] Preferably, the rebound device includes a limit plate elastically mounted on the bottom wall of the punching groove by a plurality of springs, the limit plate is located inside the punching tool, a protrusion is fixedly mounted on the lower side of the limit plate, a pressure switch matching the protrusion is fixedly mounted on the bottom wall of the punching groove, and the pressure switch is electrically connected to the electric telescopic rod.

[0030] Preferably, a plurality of positioning cores are fixedly mounted on the lower side of the limiting plate, and the plurality of positioning cores are all located in the spring, and a centering hole cooperating with the plurality of positioning cores is opened on the workbench.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] 1. A rack is fixedly installed on the right side of the outer wall of the telescopic rod, and a one-way bearing is installed on the sprocket. When the telescopic rod moves downward, the rack drives the gear to rotate, thereby driving the rotating shaft to rotate. The one-way bearing limits the sprocket to not rotate at this time. When the telescopic rod moves upward, the rack drives the gear to rotate, driving the rotating shaft to rotate. The sprocket rotates as the rotating shaft rotates, and the chain drives the sprocket 2, the rotating shaft 2 and the transmission wheel, thereby driving the conveyor belt to move. The paper movement distance driven by the rack and gear is set to the paper from the hot pressing processing position to the punching processing position. The paper movement distance is stable, which improves stability and increases the accuracy of punching and cutting.

[0033] 2. The conveyor belt is evenly installed with multiple rubber blocks. When the rubber blocks come into contact with the paper, the friction between the paper and the conveyor belt is increased, making the distance the paper moves more accurate and further increasing the accuracy of hot pressing and punching.

[0034] 3. Since the distance the conveyor belt moves each time is equal, the distances between multiple belt slots are equal. The size of the belt slots is slightly larger than that of the hot pressing upper die and the punching upper die. After the hot pressing and punching are completed, the hot pressing upper die and the punching upper die are prevented from touching the forward-moving conveyor belt during the upward movement, causing wear and damage to the conveyor belt, thereby increasing the service life of the conveyor belt. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0036] Figure 2 It is a front view of the structure of the present invention;

[0037] Figure 3 A partial cross-sectional view of a piston of the present invention;

[0038] Figure 4 It is a partial cross-sectional view of the control component of the present invention.

[0039] In the figure: 1. Base; 2. Support frame; 3. Hydraulic press; 4. Telescopic rod; 5. Punch; 6. Hot pressing upper die; 7. Blanking upper die; 8. Workbench; 9. Hot pressing lower die; 10. Blanking groove; 11. Blanking tool; 12. Conveyor wheel; 13. Conveyor belt; 14. Belt slot; 15. Rack; 16. Gear; 17. Rotating shaft 1; 18. Sprocket 1; 19. Rotating shaft 2; 20. Sprocket 2; 21. Chain; 22. Rubber block; 23. Heating chamber; 24. Oil inlet hole; 25. Oil outlet hole; 26. Mounting frame; 27. Oil pipe 1; 28. Oil pipe 2 29. Piston tube; 30. Oil inlet; 31. Oil outlet; 32. Piston; 33. Push-pull rod; 34. Mounting rod; 35. Sliding hole; 36. Mounting cover; 37. Heating box; 38. Support; 39. Slide groove; 40. Connector 1; 41. Slider; 42. Float; 43. Spring; 44. Limit plate; 45. Bump; 46. Pressure switch; 47. Positioning core; 48. Centering hole; 49. Oil pipe 3; 50. Oil pump; 51. Electric telescopic rod; 52. One-way valve 2; 53. One-way valve 1; 54. Oil pipe 4; 55. Notch; 56. Sliding rod. DETAILED DESCRIPTION

[0040] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0041] See also Figures 1 to 4 The present invention provides a paper plastic product forming device, the technical solution is as follows:

[0042] A paper plastic product forming device includes: a mounting base 1, a support frame 2 is fixed on the base 1, a hydraulic press 3 is fixedly installed in the middle of the support frame 2, a punch 5 is fixedly installed at the lower end of a telescopic rod 4 at the output end of the hydraulic press 3, a hot pressing upper die 6 is fixedly installed on the left side of the lower end of the punch 5, and a blanking upper die 7 is fixedly installed on the right side of the lower end of the punch 5, a workbench 8 is fixedly installed on the base 1, and the workbench 8 is located between the base 1 and the support frame 2, a hot pressing lower die 9 that matches the hot pressing upper die 6 is fixedly installed on the workbench 8, and the workbench 8 The upper surface of the workbench 8 is flush with the upper surface of the hot pressing lower die 9, a blanking groove 10 is provided on the workbench 8, and a blanking tool 11 that cooperates with the blanking upper die 7 is fixedly installed on the bottom wall of the blanking groove 10, a rebound device is fixedly installed on the inner side of the blanking tool 11, an electric telescopic rod 51 is installed in the blanking groove 10, two conveying wheels 12 are rotatably installed on both sides of the workbench 8, and a conveyor belt 13 is wound around the two conveying wheels 12 together, and a plurality of equidistant belt slot holes 14 that cooperate with the hot pressing upper die 6 and the blanking upper die 7 are fixedly provided on the conveyor belt 13;

[0043] Also includes:

[0044] A transmission device, wherein a transmission wheel 12 is driven by a hydraulic press 3 through the transmission device;

[0045] Constant temperature heating mechanism: A constant temperature heating mechanism is fixedly installed on the lower side of the hot pressing lower mold 9.

[0046] The operator turns on the power supply equipment and puts the paper on the conveyor belt 13. First, the oil is heated to a suitable temperature and kept stable by the constant temperature heating mechanism, and the hot pressing lower die 9 is heated to a constant temperature to ensure that the temperature of the hot pressing is constant. Then the power of the hydraulic press 3 is turned on, and the telescopic rod 4 at the output end of the hydraulic press 3 moves downward, thereby driving the punch 5 to move downward, thereby pushing the hot pressing upper die 6 at the lower end of the punch 5 to move toward the hot pressing lower die 9 on the workbench 8 that cooperates with the hot pressing upper die 6. The hot pressing upper die 6 contacts the hot pressing lower die 9 to hot press the paper, and pushes the blanking upper die 7 at the lower end of the punch 5 to move to the blanking tool 11 that cooperates with the blanking upper die 7 in the blanking groove 10 on the workbench 8 to blank the hot-pressed paper-plastic lunch box. After the hot pressing and blanking are completed, the telescopic rod 4 moves upward, driving the hot pressing upper die 6 and the blanking upper die 7 to move upward to the initial position, and the rebound device returns the paper-plastic lunch box to the original position. When the paper box is pushed out of the punching groove 10, the paper box is pushed out of the punching groove 10 to the outside of the workbench 8. The electric telescopic rod 51 is retracted and retracted at a low speed during the process to avoid damage to the paper box caused by excessive impact. In the process of the telescopic rod 4 moving upward, the transmission wheel 12 is driven to rotate by the transmission device, thereby driving the movement of the conveyor belt 13. The paper moving distance is set from the hot pressing processing position to the punching processing position. The two processes of hot pressing and punching cutting are carried out simultaneously. The paper moving distance is stable, which improves production stability and increases production efficiency. At the same time, the number of hydraulic presses 3 is reduced, and the manufacturing cost is reduced.

[0047] As an embodiment of the present invention, refer to Figure 2 , the transmission device includes:

[0048] Rack 15, a rack 15 is fixedly mounted on the right side of the outer wall of the telescopic rod 4;

[0049] Gear 16, a rotating shaft 17 is rotatably mounted on the support frame 2, and a gear 16 is fixedly mounted on one end of the rotating shaft 17 located inside the support frame 2. The gear 16 is located on the right side of the rack 15, and the gear 16 and the rack 15 are gear-matched with each other;

[0050] Sprocket 18, a sprocket 18 is fixedly mounted on one end of the rotating shaft 17 outside the support frame 2, and a one-way bearing is mounted on the sprocket 18;

[0051] The second rotating shaft 19 is fixedly mounted on the input end of the transmission wheel 12 , and the second sprocket 20 is fixedly mounted on the end of the second rotating shaft 19 away from the transmission wheel 12 , and the chain 21 is mounted on the first sprocket 18 and the second sprocket 20 together.

[0052] A rack 15 is fixedly installed on the right side of the outer wall of the telescopic rod 4, and a one-way bearing is installed on the sprocket 18. When the telescopic rod 4 moves downward, the rack 15 drives the gear 16 to rotate, thereby driving the rotating shaft 17 to rotate. The one-way bearing limits the sprocket 18 from rotating at this time. When the telescopic rod 4 moves upward, the rack 15 drives the gear 16 to rotate, driving the rotating shaft 17 to rotate, and the sprocket 18 rotates as the rotating shaft 17 rotates, and drives the sprocket 20, the rotating shaft 2 19 and the transmission wheel 12 through the chain 21, thereby driving the conveyor belt 13 to move. The rack 15 and the gear 16 are set to drive the paper movement distance from the hot pressing processing position to the blanking processing position, and the hot pressing processing position to the blanking processing position. There is a corresponding relationship between the spacing between the positions and the length of the rack 15. When the rack 15 moves down with the telescopic rod 4 and starts to contact the gear 16, the conveyor belt 13 starts to move until the end of the rack 15 contacts the gear 16. At this time, the hot pressing upper mold 6 and the punching upper mold 7 just pass through the corresponding equidistant belt slot holes 14 and extend into the inner cavity of the hot pressing lower mold 9 and the punching groove 10. The telescopic rod 4 continues to move down for processing. At this time, the gear 16 contacts the upper part of the rack 15 and is no longer driven by the meshing. Therefore, during the entire process of the hot pressing upper mold 6 and the punching upper mold 7 entering the inner cavity of the hot pressing lower mold 9 and the punching groove 10, the conveyor belt 13 stops moving to avoid jamming. The paper movement distance is stable, the stability is improved, and the accuracy of punching and cutting is increased.

[0053] As an embodiment of the present invention, refer to Figure 1 and 2 The distances between the multiple belt slot holes 14 are equal, and the size of the belt slot holes 14 is larger than the size of the hot pressing upper mold 6 and the punching upper mold 7.

[0054] Since the distance that the conveyor belt 13 moves each time is equal, the distances between multiple belt slots 14 are equal. The size of the belt slots 14 is slightly larger than the size of the hot pressing upper mold 6 and the punching upper mold 7. After the hot pressing and punching are completed, the hot pressing upper mold 6 and the punching upper mold 7 are prevented from touching the forward-moving conveyor belt 13 during the upward movement process, causing wear and damage to the conveyor belt 13, thereby increasing the service life of the conveyor belt 13.

[0055] As an embodiment of the present invention, refer to Figure 1 , the conveyor belt 13 is evenly installed with multiple rubber blocks 22.

[0056] The conveyor belt 13 is evenly equipped with a plurality of rubber blocks 22. When the rubber blocks 22 come into contact with the paper, the friction between the paper and the conveyor belt 13 is increased, making the distance the paper moves more precise and further increasing the accuracy of hot pressing and punching.

[0057] As an embodiment of the present invention, refer to Figure 3 , constant temperature heating mechanism includes:

[0058] A heating chamber 23 is provided in the workbench 8 and is located below the hot pressing lower die 9. An oil inlet 24 and an oil outlet 25 are provided on the rear side of the workbench 8 and extend into the heating chamber 23.

[0059] A mounting bracket 26 is fixedly mounted on the rear side of the support frame 2. A mounting cover 36 is connected to the top of the mounting bracket 26 via threaded bolts. A piston tube 29 is fixedly mounted in the mounting bracket 26, and a piston 32 is slidably mounted in the piston tube 29. The piston 32 is driven up and down by a driving device, and an oil inlet 30 and an oil outlet 31 are respectively opened at the lower end of the piston tube 29;

[0060] Oil pipe 1 27, one side of the oil pipe 1 27 is connected to the oil outlet 31, and the side of the oil pipe 1 27 away from the piston tube 29 is connected to the oil inlet 24, and a one-way valve 1 53 is fixedly installed on the oil pipe 1 27;

[0061] Oil pipe 28, one side of the oil pipe 28 is connected to the oil inlet 30, and the side of the oil pipe 28 away from the piston tube 29 is connected to the heating box 37, a one-way valve 2 52 is fixedly installed on the oil pipe 28, an oil pipe 4 54 is fixedly installed on the top of the outer wall of the heating box 37, and the end of the oil pipe 4 54 away from the heating box 37 is fixedly connected to the oil outlet 25, an oil pipe 3 49 is fixedly installed on the top of the heating box 37, and an oil pump 50 is fixedly installed on the oil pipe 3 49, the oil pipe 3 49 is inserted into the oil source away from the heating box 37, and a liquid level control component for controlling the liquid level is fixedly installed in the heating box 37.

[0062] The oil is heated by the heating box 37 to maintain a constant temperature. The piston tube 29 is fixedly installed in the mounting frame 26. When the driving device moves the piston 32 upward, the one-way valve 252 is opened and the one-way valve 1 is closed. At this time, the oil pipe 28 is opened and the oil pipe 1 is closed, so that the hot oil in the heating box 37 can be pumped into the piston tube 29. When the driving device moves the piston 32 downward, the one-way valve 252 is closed and the one-way valve 1 53 is opened. At this time, the oil pipe 28 is closed and the oil pipe 1 27 is opened, so that the hot oil in the piston tube 29 can be pushed into the heating chamber 23. The oil filled in the heating chamber 23 is pushed into the heating box 37 by the newly entered hot oil from the oil outlet 25 and the oil pipe 4 54. The oil is reheated after entering the heating box 37. Therefore, the hot oil in the heating chamber 23 can maintain a relatively stable temperature, ensuring that the temperature of the hot pressing lower mold 9 remains relatively stable during the hot pressing process, preventing wrinkles caused by uneven heating of the paper during the hot pressing process, and improving the aesthetics of the paper-plastic lunch box.

[0063] As an embodiment of the present invention, refer to Figure 1 and 3 , the driving device includes:

[0064] A push-pull rod 33 is fixedly mounted on the upper end of the piston 32;

[0065] Sliding hole 35: A sliding hole 35 is opened in the middle of the mounting cover 36, and the push-pull rod 33 is slidably connected to the sliding hole 35;

[0066] The mounting rod 34 is fixedly mounted on the punch 5 , a slot 55 is fixedly opened on the support frame 2 , the mounting rod 34 extends to the outside of the support frame 2 through the slot 55 , and the push-pull rod 33 is fixedly mounted on the mounting rod 34 .

[0067] The telescopic rod 4 moves back and forth, thereby driving the punch 5, the mounting rod 34 and the push-pull rod 33 to move back and forth, thereby driving the piston 32 to move back and forth, thereby realizing the constant temperature hot water oil circulation in the heating chamber 23, reducing the power device, and increasing the accuracy of the intermittent transmission of the conveyor belt 13 through mechanical linkage, thereby reducing the manufacturing cost; without the need for too many electronic equipment, the linkage between the hot oil in the heating chamber 23 and the paper thermoforming process is realized; when the telescopic rod 4 drives the hot pressing upper die 6 and the punching upper die 7 to move downward for thermoforming processing, it just drives the piston 32 to move downward to drive the newly heated oil to flow and replace the oil in the heating chamber that has lost heat in the previous processing, thereby further realizing linkage, ensuring that the oil in the heating chamber 23 is always at a suitable and stable temperature for forming the paper; and the main linkage is through the mechanical structure, the operation is stable and reliable, and it is easy to maintain.

[0068] As an embodiment of the present invention, refer to Figure 3 The sliding hole 35 is rectangular, and the push-pull rod 33 is a rectangular rod that cooperates with the sliding hole 35.

[0069] The sliding hole 35 is rectangular, and the push-pull rod 33 is a rectangular rod that cooperates with the sliding hole 35, thereby limiting the push-pull rod 33 and the piston 32 from rotating. When the piston 32 moves up and down, the rotation will accelerate the wear of the piston 32. Limiting it to non-rotatable can reduce the degree of wear of the piston 32 in the same cycle and increase the service life of the piston 32.

[0070] As an embodiment of the present invention, refer to Figure 4 The liquid level control assembly includes a support 38 fixedly mounted on the inner wall of the heating box 37, a slide groove 39 is provided on the support 38, and a connector 40 is installed in the slide groove 39, and the connector 40 is electrically connected to the oil pump 50. A slider 41 in contact with the connector 40 is fixedly mounted in the slide groove 39, and a float 42 is fixedly mounted on the slider 41.

[0071] When the heating box 37 heats the circulating oil, there will be a certain amount of oil loss. When the oil is lost, the float 42 will move downward, and the float 42 will drive the sliding rod 56 and the slider 41 to move downward. When the float 42 drops to the same level as the alarm line, the oil in the heating box 37 is too little and needs to be added. The slider 41 will contact the connector 40 and be energized, and the oil pump 50 will start to pump oil, reducing manual refueling and increasing the degree of automation.

[0072] As an embodiment of the present invention, refer to Figure 2 The rebound device includes a limit plate 44 elastically mounted on the bottom wall of the punching groove 10 through multiple springs 43. The limit plate 44 is located in the punching tool 11. A protrusion 45 is fixedly mounted on the lower side of the limit plate 44. A pressure switch 46 that cooperates with the protrusion 45 is fixedly mounted on the bottom wall of the punching groove 10. The pressure switch 46 is electrically connected to the electric telescopic rod 51.

[0073] When the punching upper die 7 moves downward, the spring 43 is squeezed, and the punching upper die 7 presses the limit plate 44 downward. The protrusion 45 of the limit plate 44 applies pressure to the pressure switch 46. The pressure switch 46 has a delay device. After the paper-plastic lunch box is punched by the punching tool 11, the paper-plastic lunch box is cut and placed inside the punching tool 11 on all sides. The punching upper die 7 moves upward, and multiple springs 43 restore their elasticity. When the limit plate 44 is moved upward to the upper side of the punching tool 11, the pressure switch 46 controls the electric telescopic rod 51 to be energized and extend outward, pushing the paper-plastic lunch box out of the punching slot 10, reducing labor and improving the degree of automation.

[0074] As an embodiment of the present invention, refer to Figure 4 A plurality of positioning cores 47 are fixedly mounted on the lower side of the limiting plate 44 , and the plurality of positioning cores 47 are all located in the spring 43 . A centering hole 48 cooperating with the plurality of positioning cores 47 is opened on the workbench 8 .

[0075] During the process of the spring 43 being squeezed and released, the limit plate 44 is not stable and may shake to a certain extent. The limit plate 44 is limited by the positioning core 47, and the positioning core 47 moves up and down in the centering hole 48 to ensure that the limit plate 44 moves up and down stably, thereby improving the stability of the paper-plastic lunch box on the limit plate 44 and improving the stability of the paper-plastic lunch box when being pushed out by the electric telescopic rod 51.

[0076] Working principle: The operator turns on the power supply equipment and puts the paper on the conveyor belt 13. First, the constant temperature heating mechanism heats the oil to a suitable temperature and keeps it stable. The hot pressing lower die 9 is heated to a constant temperature to ensure that the temperature of the hot pressing is constant. Then the power of the hydraulic press 3 is turned on. The telescopic rod 4 at the output end of the hydraulic press 3 moves downward, thereby driving the punch 5 to move downward, thereby pushing the hot pressing upper die 6 at the lower end of the punch 5 to move to the hot pressing lower die 9 on the workbench 8 that cooperates with the hot pressing upper die 6. The hot pressing upper die 6 contacts the hot pressing lower die 9 to hot press the paper, and pushes the blanking upper die 7 at the lower end of the punch 5 to move to the blanking tool 11 that cooperates with the blanking upper die 7 in the blanking groove 10 on the workbench 8 to blank the hot-pressed paper-plastic lunch box. After the hot pressing and blanking are completed, the telescopic rod 4 is stretched. The retraction rod 4 moves upward, driving the hot pressing upper mold 6 and the punching upper mold 7 to move upward to the initial position, and the rebound device rebounds the paper plastic lunch box to above the punching cutters 11 on all sides. When the paper plastic lunch box is pushed out of the punching slot 10 by the electric telescopic rod 51, the telescopic rod 4 moves upward, and the transmission device drives the transmission wheel 12 to rotate, thereby driving the movement of the conveyor belt 13. A rack 15 is fixedly installed on the right side of the outer wall of the telescopic rod 4, and a one-way bearing is installed on the sprocket 18. When the telescopic rod 4 moves downward, the rack 15 drives the gear 16 to rotate, thereby driving the rotating shaft 17 to rotate. The one-way bearing limits the sprocket 18 from rotating at this time. When the telescopic rod 4 moves upward, the rack 15 drives the gear 16 to rotate, thereby driving the rotating shaft 17 to rotate, and the sprocket 1 8 rotates as the rotating shaft 17 rotates, and drives the sprocket 20, the rotating shaft 2 19 and the transmission wheel 12 through the chain 21, thereby driving the conveyor belt 13 to move. The paper movement distance is set to the paper from the hot pressing processing position to the blanking processing position. The hot pressing forming and blanking cutting processes are carried out simultaneously. The paper movement distance is stable. Since the conveyor belt 13 moves the same distance each time, the distances between the multiple belt slots 14 are equal. The size of the belt slots 14 is slightly larger than the size of the hot pressing upper die 6 and the blanking upper die 7. The conveyor belt 13 is evenly installed with multiple rubber blocks 22. When the rubber blocks 22 come into contact with the paper, the friction between the paper and the conveyor belt 13 is increased. The oil is heated by the heating box 37 to maintain a constant temperature and is fixed in the mounting frame 26. A piston tube 29 is installed. When the driving device moves the piston 32 upward, the one-way valve 2 52 is opened and the one-way valve 1 53 is closed. At this time, the oil pipe 28 is opened and the oil pipe 1 27 is closed. Therefore, the hot oil in the heating box 37 can be pumped into the piston tube 29. When the driving device moves the piston 32 downward, the one-way valve 2 52 is closed and the one-way valve 1 53 is opened. At this time, the oil pipe 28 is closed and the oil pipe 1 27 is opened. The hot oil in the piston tube 29 can be pushed into the heating chamber 23. The oil filled in the heating chamber 23 is pushed into the heating box 37 from the oil outlet 25 and the oil pipe 4 54 by the newly entered hot oil. The oil is reheated after entering the heating box 37. Therefore, the hot oil in the heating chamber 23 can maintain a relatively stable temperature. When the heating box 37 heats the circulating oil,There will be a certain amount of oil loss. When the oil is lost, the float 42 drives the sliding rod 56 and the slider 41 to move downward. When the float 42 drops to the level of the alarm line, the oil in the heating box 37 is too little and needs to be added. The slider 41 will contact the connector 40 and be energized, and the oil pump 50 will start to pump oil, ensuring that the temperature of the hot pressing lower mold remains relatively stable during the hot pressing process, preventing the paper from being unevenly heated during the hot pressing process and causing wrinkles, thereby improving the aesthetics of the paper-plastic lunch box. The sliding hole 35 is rectangular, and the push-pull rod 33 is a rectangular rod that cooperates with the sliding hole 35, thereby limiting the push-pull rod 33 and the piston 32 from rotating. When the piston 32 moves up and down, the rotation will accelerate the wear of the piston 32. When the punching upper mold 7 moves downward, the spring 43 is squeezed, and the punching upper mold 7 will limit the position of the limit plate. 44 is pressed down, and the protrusion 45 of the limit plate 44 applies pressure to the pressure switch 46. There is a delay on the pressure switch 46. After the paper plastic lunch box is punched by the punching tool 11, the paper plastic lunch box is cut and placed inside the punching tool 11 on all sides. The punching upper die 7 moves upward, and multiple springs 43 recover their elasticity. When the limit plate 44 moves upward to the upper side of the punching tool 11, the pressure switch 46 controls the electric telescopic rod 51 to be energized and extend outward, pushing the paper plastic lunch box out of the punching slot 10. During the process of the spring 43 being squeezed and released, the limit plate 44 is not stable and may shake to a certain extent. The limit plate 44 is limited by the positioning core 47, and the positioning core 47 moves up and down in the centering hole 48 to ensure that the limit plate 44 moves up and down stably, thereby improving the stability of the paper plastic lunch box on the limit plate 44.

[0077] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A paper plastic product forming device, comprising: A base (1) is fixedly mounted on the upper portion of the base (1), a hydraulic press (3) is fixedly mounted in the middle of the support frame (2), a punch (5) is fixedly mounted on the lower end of a telescopic rod (4) at the output end of the hydraulic press (3), a hot pressing upper die (6) is fixedly mounted on the left side of the lower end of the punch (5), and a blanking upper die (7) is fixedly mounted on the right side of the lower end of the punch (5), a workbench (8) is fixedly mounted on the base (1), and the workbench (8) is located between the base (1) and the support frame (2), a hot pressing lower die (9) that matches the hot pressing upper die (6) is fixedly mounted on the workbench (8), and the workbench (8) The upper surface of the workbench (8) is flush with the upper surface of the hot pressing lower die (9), a blanking groove (10) is provided on the workbench (8), and a blanking tool (11) that matches the blanking upper die (7) is fixedly installed on the bottom wall of the blanking groove (10), a rebound device is fixedly installed on the inner side of the blanking tool (11), an electric rod (51) is installed in the blanking groove (10), two transmission wheels (12) are rotatably installed on both sides of the workbench (8), and a conveyor belt (13) is wound around the two transmission wheels (12), and a plurality of belt slot holes (14) that match the hot pressing upper die (6) and the blanking upper die (7) are fixedly provided on the conveyor belt (13); It is characterized by further comprising: a transmission device, wherein one of the transmission wheels (12) is driven by a hydraulic press (3) through the transmission device; A constant temperature heating mechanism is fixedly installed on the lower side of the hot pressing lower die (9); The transmission device comprises: A rack (15) is fixedly mounted on the right side of the outer wall of the telescopic rod (4); Gear (16), a rotating shaft (17) is rotatably mounted on the support frame (2), and a gear (16) is fixedly mounted on one end of the rotating shaft (17) located inside the support frame (2), the gear (16) is located on the right side of the rack (15), and the gear (16) and the rack (15) are gear-matched with each other; Sprocket one (18), one end of the rotating shaft one (17) located outside the support frame (2) is fixedly mounted with sprocket one (18), and a one-way ratchet is mounted on the sprocket one (18); A second rotating shaft (19), the input end of the transmission wheel (12) is fixedly mounted with the second rotating shaft (19), and an end of the second rotating shaft (19) away from the transmission wheel (12) is fixedly mounted with a second sprocket (20), and a chain (21) is mounted on both the first sprocket (18) and the second sprocket (20); The distances between the plurality of belt slot holes (14) are equal, and the size of the belt slot holes (14) is larger than the size of the hot pressing upper die (6) and the punching upper die (7); The conveyor belt (13) is evenly mounted with a plurality of rubber blocks (22).

2. The paper plastic product forming equipment according to claim 1, characterized in that: The constant temperature heating mechanism comprises: a heating cavity (23), the workbench (8) is provided with a heating cavity (23), and the heating cavity (23) is located at the lower side of the hot pressing lower die (9), and the rear side of the workbench (8) is provided with an oil inlet hole (24) and an oil outlet hole (25), and the oil inlet hole (24) and the oil outlet hole (25) extend into the heating cavity (23); A mounting frame (26), the rear side of the support frame (2) is fixedly mounted with the mounting frame (26), the top end of the mounting frame (26) is connected to a mounting cover (36) via a threaded bolt, a piston tube (29) is fixedly mounted in the mounting frame (26), and a piston (32) is slidably mounted in the piston tube (29), the piston (32) is driven to move up and down by a driving device, and an oil inlet (30) and an oil outlet (31) are respectively opened at the lower end of the piston tube (29); An oil pipe (27), one side of the oil pipe (27) is connected to the oil outlet (31), and the side of the oil pipe (27) away from the piston tube (29) is connected to the oil inlet (24), and a one-way valve (53) is fixedly installed on the oil pipe (27); Oil pipe 2 (28), one side of the oil pipe 2 (28) is connected to the oil inlet (30), and the side of the oil pipe 2 (28) away from the piston tube (29) is connected to the heating box (37), a one-way valve 2 (52) is fixedly installed on the oil pipe 2 (28), the top of the outer wall of the heating box (37) is fixedly installed with oil pipe 4 (54), and the end of the oil pipe 4 (54) away from the heating box (37) is fixedly connected to the oil outlet (25), the top of the heating box (37) is fixedly installed with oil pipe 3 (49), and an oil pump (50) is fixedly installed on the oil pipe 3 (49), the oil pipe 3 (49) is inserted into the oil tank away from the heating box (37), and a liquid level control component for controlling the liquid level is fixedly installed in the heating box (37).

3. The paper plastic product forming equipment according to claim 2, characterized in that: The driving device comprises: a push-pull rod (33), the upper end of the piston (32) being fixedly mounted with the push-pull rod (33); A sliding hole (35), wherein the middle of the mounting cover (36) is provided with a sliding hole (35), and the push-pull rod (33) is slidably connected to the sliding hole (35); The mounting rod (34) is fixedly mounted on the punch (5), a notch (55) is fixedly opened on the support frame (2), the mounting rod (34) extends to the outside of the support frame (2) through the notch (55), and the push-pull rod (33) is fixedly mounted on the mounting rod (34).

4. The paper plastic product forming equipment according to claim 3, characterized in that: The sliding hole (35) is rectangular, and the push-pull rod (33) is a rectangular rod that cooperates with the sliding hole (35).

5. The paper plastic product forming equipment according to claim 2, characterized in that: The liquid level control assembly includes a support (38) fixedly mounted on the upper end of the heating box (37), a chute (39) is provided on the support (38), and a connector (40) is installed in the chute (39), and the connector (40) is electrically connected to the oil pump (50), a slider (41) in contact with the connector (40) is fixedly mounted in the chute (39), and a sliding rod (56) is fixedly connected to the slider (41), the lower end of the sliding rod (56) extends into the heating box (37), and a float (42) is fixedly mounted on the lower end of the sliding rod (56).

6. The paper plastic product forming equipment according to claim 1, characterized in that: The rebound device includes a limit plate (44) elastically mounted on the bottom wall of the punching groove (10) via a plurality of springs (43); the limit plate (44) is located inside the punching tool (11); a protrusion (45) is fixedly mounted on the lower side of the limit plate (44); a pressure switch (46) matched with the protrusion (45) is fixedly mounted on the bottom wall of the punching groove (10); and the pressure switch (46) is electrically connected to the electric rod (51).

7. The paper plastic product forming equipment according to claim 6, characterized in that: A plurality of positioning cores (47) are fixedly mounted on the lower side of the limiting plate (44), and the plurality of positioning cores (47) are all located in the spring (43). A centering hole (48) cooperating with the plurality of positioning cores (47) is provided on the workbench (8).

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