Cup cover forming equipment suitable for biodegradable materials

Abstract

The cup cover forming equipment suitable for the biodegradable materials comprises an upper die, a lower die and a grabbing device, the surface, close to the lower die, of the upper die is provided with a plurality of first forming cavities, punching assemblies are arranged in the first forming cavities, and the punching assemblies are used for edge punching and hole punching in the cup cover forming process; a plurality of second forming cavities are formed in the surface, close to the upper mold, of the lower mold, and the second forming cavities and the first forming cavities are arranged in a one-to-one correspondence mode; a forming assembly is arranged in the second forming cavity, and the forming assembly is used for forming the sheet into the cup cover; the grabbing device is used for simultaneously taking out the plurality of processed cup lids and automatically stacking the cup lids in order; by means of the structure, punching and edge punching can be conducted on a sheet at the same time through cooperation of the upper die and the lower die, so that a cup cover is formed, the machining effect is improved, and the cost is low; and in addition, the machined cup covers are grabbed and stacked in order through the grabbing device, stacking and aligning do not need to be conducted again, and therefore the extra labor cost is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of cup cover molding, and in particular to a cup cover molding device suitable for biodegradable materials. Background Art

[0002] With the changes of the times and the improvement of living standards, people's pace of life is getting faster and faster, and fast food culture is also popular. The basis of fast food culture lies in convenient, hygienic and easy-to-carry food boxes, beverage cups and disposable tableware. Common beverage cups are generally disposable paper cups and plastic cups, which are mainly used to hold beverages in daily dining.

[0003] The existing cup lid forming equipment basically adopts side punching equipment to punch holes and edges of the sheet raw materials separately, which takes a long time to process and has low efficiency. At the same time, the price of side punching equipment is very high, resulting in increased processing costs. In addition, the cup lids processed by the side punching equipment need to be stacked again after falling, which will also increase additional costs. Summary of the invention

[0004] The purpose of this application is to provide a cup lid forming device suitable for biodegradable materials in order to solve the above problems.

[0005] The present application provides a cup lid forming device suitable for biodegradable materials, comprising: an upper mold, a lower mold and a gripping device; The surface of the upper mold close to the lower mold has a plurality of first molding cavities, and a punching assembly is arranged in the first molding cavity, and the punching assembly is used for punching edges and holes during the cup cover molding process; The surface of the lower mold close to the upper mold has a plurality of second molding cavities, and the second molding cavities are arranged one by one corresponding to the first molding cavities; a molding assembly is arranged inside the second molding cavity, and the molding assembly is used to mold the sheet into a cup cover; The grabbing device is used to take out a plurality of processed cup lids at the same time and automatically align them.

[0006] According to the technical solution provided in the present application, the molding component includes: a first ejector block, a second ejector block and a suction piece, the suction piece is arranged between the first ejector block and the second ejector block, the suction piece is connected to the vacuum component, and the suction piece is used to suck the sheet during the cup cover molding process; a support structure is arranged at the bottom of the suction piece, the interior of the support structure is hollow, and the support structure is connected to the suction piece; the support structure is used to leave a gap between the edge of the cup cover and the surface of the lower mold close to the upper mold, so as to avoid the formation of a negative pressure cavity between the cup cover and the second molding cavity.

[0007] According to the technical solution provided in the present application, a mold pad is provided on the surface of the lower mold close to the upper mold, the second molding cavity passes through the mold pad, and a plurality of first air holes connected to the second molding cavity are provided on the side wall of the mold pad.

[0008] According to the technical solution provided in the present application, a plurality of second air holes communicating with the second molding cavity are provided on the side wall of the lower mold.

[0009] According to the technical solution provided in the present application, the punching assembly includes: a first cutting piece, a second cutting piece and a punching structure, the first cutting piece circumferentially surrounds the edge of the first molding cavity and is located on a side close to the second molding cavity, and the first cutting piece is used to cut out the edge of the cup lid; the second cutting piece is arranged in the first molding cavity and corresponds to the second ejection block, and the second cutting piece is used to cut out a drinking port; the punching structure is arranged in the first molding cavity and corresponds to the first ejection block, and the punching structure is used to form an air outlet.

[0010] According to the technical solution provided in this application, the punching structure includes: A guide block, the guide block is arranged in the first molding cavity, an elastic member is arranged at the bottom of the guide block, the elastic member is arranged at the bottom of the guide block, one end of the elastic member is connected to the guide block, and the other end of the elastic member is connected to the bottom wall of the first molding cavity; at least one first through hole is arranged on the guide block along a first direction; the first direction is perpendicular to the bottom wall of the first molding cavity; An ejector pin, the ejector pin being arranged in the first molding cavity along the first direction, and one end of the ejector pin extending into the first through hole; The elastic member has a first state and a second state. When in the first state, the elastic member is in a released state, and the ejector pin is in the first through hole. When in the second state, the elastic member is in a compressed state, and the ejector pin extends out of the first through hole and punches the sheet to form the vent.

[0011] According to the technical solution provided in the present application, a lifting structure is provided at the bottom of the ejector pin, and the lifting structure is used to control the extension height of the ejector pin.

[0012] According to the technical solution provided in this application, the lifting structure includes: A lifting rod, wherein the lifting rod is arranged in the upper mold, one end of the lifting rod extends into the first molding cavity, and a driving end of the lifting rod is connected to the ejector pin; A displacement sensor is arranged at the top of the ejector pin, and is used to monitor the change in the distance between the ejector pin and the sheet material to ensure the depth of penetration of the ejector pin into the sheet material.

[0013] According to the technical solution provided in the present application, the edges of the second ejection block and the first ejection block are arc-shaped.

[0014] According to the technical solution provided in the present application, the grasping device includes: a robotic arm, a driving end of the robotic arm is connected to a connecting plate, a plurality of suction cups are arranged at the bottom of the connecting plate, and the suction cups are arranged in a one-to-one correspondence with the second molding cavity.

[0015] Compared with the prior art, the present invention has the following advantages: The present application provides a cup cover forming device suitable for biodegradable materials, comprising: an upper mold, a lower mold and a gripping device, wherein the upper mold has a plurality of first molding cavities on a surface close to the lower mold, wherein a punching assembly is arranged in the first molding cavity, and the punching assembly is used for punching edges and holes during the cup cover forming process; the lower mold has a plurality of second molding cavities on a surface close to the upper mold, wherein the second molding cavities correspond to the first molding cavities in a one-to-one manner; a molding assembly is arranged inside the second molding cavity, and the molding assembly is used for forming a sheet into a cup cover; the gripping device is used for taking out a plurality of processed cup covers at the same time and automatically aligning them; when the present application is used, the sheet is placed on the lower mold, and then the upper mold is controlled to The mold moves toward the direction approaching the lower mold, and the upper mold punches from top to bottom, and the multiple forming components and the multiple punching components cooperate one by one to form multiple cup lids; after the cup lids are made, the upper mold is controlled to move in the direction away from the lower mold, and then the grasping device takes out the multiple processed cup lids at the same time and places them in the specified position at the same time, and the cup lids are arranged in sequence at this time; through the above structure, the present application can punch and edge the sheet at the same time through the cooperation of the upper mold and the lower mold to form the cup lid, saving processing time and improving processing efficiency; at the same time, the equipment structure is simple and the cost is low; in addition, the processed cup lids are grasped and stacked by the grasping device, and there is no need to re-stacking and align, thereby reducing additional labor costs.

[0016] It should be understood that the description of technical features, technical solutions, beneficial effects or similar language in this application does not imply that all features and advantages can be realized in any single embodiment. On the contrary, it is understood that the description of features or beneficial effects means that specific technical features, technical solutions or beneficial effects are included in at least one embodiment. Therefore, the description of technical features, technical solutions or beneficial effects in this specification does not necessarily refer to the same embodiment. Furthermore, the technical features, technical solutions and beneficial effects described in the present embodiment can also be combined in any appropriate manner. Those skilled in the art will understand that the embodiment can be realized without one or more specific technical features, technical solutions or beneficial effects of a specific embodiment. In other embodiments, additional technical features and beneficial effects can also be identified in a specific embodiment that does not embody all embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solution in this embodiment, the drawings required for use in the description of the embodiment will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 A schematic diagram of a lower mold of a cup lid molding device suitable for biodegradable materials provided in Example 1 of the present application; Figure 2 is a schematic diagram of the interior of the second molding cavity; Figure 3 A schematic diagram of an upper mold of a cup lid molding device suitable for biodegradable materials provided in Example 1 of the present application; Figure 4 Schematic diagram of the interior of the first molding cavity.

[0019] In the figure: 1. upper mold; 11. first molding cavity; 12. first cutting piece; 13. second cutting piece; 14. guide block; 15. first through hole; 2. lower mold; 21. second molding cavity; 22. first ejector block; 23. second ejector block; 24. suction piece; 25. supporting structure; 26. mold pad; 27. first air hole; 28. second air hole. DETAILED DESCRIPTION

[0020] In order to enable those skilled in the art to better understand the technical solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings. The description in this section is only exemplary and explanatory and should not have any limiting effect on the protection scope of the present application. Specifically, the described embodiments are only embodiments of a part of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work should fall within the scope of protection of the present application.

[0021] It should be noted that similar reference numerals and letters represent similar items in the following figures, so once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0022] Example 1 Please refer to Figure 1-Figure 4 As shown, a schematic diagram of a cup cover forming device suitable for biodegradable materials provided in this embodiment includes: an upper mold 1, a lower mold 2 and a gripping device; The upper mold 1 has a plurality of first molding cavities 11 on its surface close to the lower mold 2. A punching assembly is disposed in the first molding cavity 11. The punching assembly is used for punching edges and holes during the cup cover forming process. The surface of the lower mold 2 close to the upper mold 1 has a plurality of second molding cavities 21, and the second molding cavities 21 are arranged one by one corresponding to the first molding cavities 11; a molding assembly is arranged inside the second molding cavity 21, and the molding assembly is used to mold the sheet into a cup cover; The grabbing device is used to take out multiple processed cup lids at the same time and automatically align them.

[0023] In this embodiment, the lower mold 2 is fixedly placed on the placement platform, the upper mold 1 is arranged above the lower mold 2, and the upper mold 1 is connected to the driving device, and the driving device is used to drive the upper mold 1 to move up and down; the grabbing device is also fixedly placed on the placement platform; In some embodiments, the grabbing device includes: a robotic arm, a connecting plate is connected to the driving end of the robotic arm, a plurality of suction cups are arranged at the bottom of the connecting plate, and the suction cups are arranged one-to-one with the second molding cavity 21; the plurality of suction cups are connected to the air source; after the cup lids are formed, the robotic arm drives the plurality of suction cups to move between the upper mold 1 and the lower mold 2, at which time the suction cups correspond one-to-one with the cup lids, and then the robotic arm drives the suction cups to move downward to take out the formed cup lids at the same time; and the robotic arm drives the plurality of cup lids to move to the designated positions and arrange them in order; after the next group of cup lids are formed, the robotic arm automatically stacks the next group of cup lids above the previous group of cup lids, without the need to manually re-align the stacking of the cup lids, thereby reducing additional labor costs; Working principle: When this embodiment is in use, the sheet is placed on the lower mold 2, and then the upper mold 1 is controlled to move in the direction close to the lower mold 2. The upper mold 1 punches from top to bottom, and multiple forming components and multiple punching components cooperate one by one to form multiple cup lids; after the cup lids are made, the upper mold 1 is controlled to move in the direction away from the lower mold 2, and then the grasping device takes out the multiple processed cup lids at the same time and places them in the designated positions at the same time. At this time, the cup lids are arranged in sequence; through the above structure, the present application can punch and edge the sheet at the same time through the cooperation of the upper mold 1 and the lower mold 2 to form the cup lid, and the equipment structure is simple and the cost is low; at the same time, the processed cup lids are grasped and stacked by the grasping device, and there is no need to re-stacking and align, thereby reducing additional labor costs.

[0024] In some embodiments, the molding assembly includes: a first ejector block 22, a second ejector block 23 and a suction piece 24, the suction piece 24 is arranged between the first ejector block 22 and the second ejector block 23, the suction piece 24 is connected to the vacuum assembly, and the suction piece 24 is used to suck the sheet during the cup cover molding process; a support structure 25 is arranged at the bottom of the suction piece 24, the interior of the support structure 25 is hollow, and the support structure 25 is connected to the suction piece 24; the support structure 25 is used to leave a gap between the edge of the cup cover and the surface of the lower mold 2 close to the upper mold 1, so as to avoid the formation of a negative pressure cavity between the cup cover and the second molding cavity 21.

[0025] Specifically, Figure 2 As shown, the forming assembly includes: a first ejector block 22, a second ejector block 23 and an air suction member 24; wherein: the first ejector block 22 and the second ejector block 23 are used to form a convex portion adapted thereto on the surface of the cup cover, so that the surface of the cup cover forms a specific shape; Specifically, the suction member 24 is disposed between the first ejection block 22 and the second ejection block 23, and the suction member 24 is connected to the vacuum assembly; during the cup cover forming process, after the sheet is placed on the lower mold 2, the sheet is sucked by suction to prevent the sheet from moving; then the upper mold 1 is punched from top to bottom, and multiple molding assemblies and multiple punching assemblies cooperate one by one to form multiple cup covers; Specifically, after the cup cover is formed, it is still sucked by the suction piece 24. At this time, the edge of the cup cover is tightly attached to the lower mold 2, and a negative pressure cavity is formed between the cup cover and the second molding cavity 21. Due to the instability of the biodegradable material, when the gripping device sucks the cup cover, although the suction piece 24 is no longer used to suck the cup cover, the negative pressure cavity between the edge of the cup cover and the lower mold 2 still exists, and the suction force of the gripping device is too large, which easily forms a bulge in the middle of the cup cover. Therefore, in order to solve the above problems, a support structure 25 is provided at the bottom of the suction piece 24 in this embodiment. In this embodiment, the support structure 25 is a support block. The interior of the support block is hollow. The support block and the suction piece 24 are connected to each other. The air component 24 is connected, and the vacuum component is connected to the suction component 24 through the support block; the support block is used to raise the height of the suction component 24 so that the top of the suction component 24 is slightly higher than the height of the upper surface of the lower mold 2, so that after the cup cover is formed, there is a gap between the edge of the cup cover and the upper surface of the lower mold 2, and it is not tightly attached to the lower mold 2, thereby avoiding the formation of a negative pressure cavity between the cup cover and the second molding cavity 21, and thus avoiding the destruction of the shape of the cup cover when the grasping device grasps the cup cover; in some embodiments, the edge of the formed cup cover is approximately 2 cm in height, so in the present application, the top of the suction component 24 is slightly higher than the upper surface of the lower mold 2 by 2.5 cm.

[0026] In some embodiments, a mold pad 26 is provided on the surface of the lower mold 2 close to the upper mold 1 , the second molding cavity 21 passes through the mold pad 26 , and a plurality of first air holes 27 connected to the second molding cavity 21 are provided on the side wall of the mold pad 26 .

[0027] Specifically, a mold pad 26 is provided on the surface of the lower mold 2 close to the upper mold 1, and the mold pad 26 is used to make the surface of the lower mold 2 smoother. The second molding cavity 21 is set through the mold pad 26, and a plurality of first air holes 27 connected to the second molding cavity 21 are provided on the side wall of the mold pad 26, so as to further avoid the formation of a negative pressure cavity in the second molding cavity 21.

[0028] In some embodiments, a plurality of second air holes 28 communicating with the second molding cavity 21 are disposed on the side wall of the lower mold 2 .

[0029] Specifically, a plurality of second through holes communicating with the second molding cavity 21 are disposed on the side wall of the lower mold 2 , so as to further avoid the formation of a negative pressure cavity in the second molding cavity 21 .

[0030] In some embodiments, the punching assembly includes: a first cutting piece 12, a second cutting piece 13 and a punching structure, the first cutting piece 12 circumferentially surrounds the edge of the first molding cavity 11 and is located on a side close to the second molding cavity 21, and the first cutting piece 12 is used to cut out the edge of the cup lid; the second cutting piece 13 is arranged in the first molding cavity 11 and corresponds to the second ejection block 23, and the second cutting piece 13 is used to cut out the drinking port; the punching structure is arranged in the first molding cavity 11, and the punching structure corresponds to the first ejection block 22, and the punching structure is used to form an air outlet.

[0031] Specifically, Figure 4 As shown, the punching assembly includes: a first cutting piece 12, a second cutting piece 13 and a punching structure; during the cup cover molding process, the upper mold 1 punches the lower mold 2 from top to bottom, at which time the first cutting piece 12 cuts out the edge of the cup cover, the second cutting piece 13 cuts out the drinking port of the cup cover, and at the same time the punching structure pushes out the air outlet of the cup cover.

[0032] In certain embodiments, the punching structure comprises: A guide block 14 is provided in the first molding cavity 11. An elastic member is provided at the bottom of the guide block 14. The elastic member is provided at the bottom of the guide block 14. One end of the elastic member is connected to the guide block 14, and the other end of the elastic member is connected to the bottom wall of the first molding cavity 11. At least one first through hole 15 is provided on the guide block 14 along a first direction. The first direction is perpendicular to the bottom wall of the first molding cavity 11. An ejector pin is disposed in the first molding cavity 11 along a first direction, and one end of the ejector pin extends into the first through hole 15; The elastic member has a first state and a second state. In the first state, the elastic member is in a released state, and the ejector pin is in the first through hole 15. In the second state, the elastic member is in a compressed state, and the ejector pin extends out of the first through hole 15 and punches the sheet to form an air outlet.

[0033] Specifically, the punching structure includes: a guide block 14, an elastic member and an ejector pin; during the cup cover forming process, the upper mold 1 punches the lower mold 2 from top to bottom, at this time, the first ejector block 22 squeezes the guide block 14, the elastic member becomes compressed, and the ejector pin extends out of the first through hole 15 to punch the sheet to form an air outlet hole for the cup cover; After the cup cover is formed, the upper mold 1 moves away from the lower mold 2. At this time, the elastic member becomes released, the guide block 14 moves upward, and the ejector pin is in the first through hole 15. The guide block 14 is used to protect the ejector pin and ensure that the ejector pin remains stable during the lifting process to prevent it from tilting or deviating from the original track.

[0034] In some embodiments, a lifting structure is provided at the bottom of the ejector pin, and the lifting structure is used to control the extension height of the ejector pin.

[0035] Specifically, in the process of forming the air outlet hole of the cup cover at the current stage, when the ejector pin is inserted into the cup cover too deeply, the air outlet hole may be easily made too large. At the same time, when the upper mold 1 and the lower mold 2 are separated, the cup cover may be stuck on the ejector pin and may not fall off easily. Therefore, in the present application, a lifting structure is provided at the bottom of the ejector pin, and the lifting structure is used to control the extension height of the ejector pin to prevent the ejector pin from being inserted too deeply, thereby preventing the ejector pin from being difficult to fall off during processing.

[0036] In some embodiments, the lifting structure includes: A lifting rod, the lifting rod is arranged in the upper mold 1, one end of the lifting rod extends into the first molding cavity 11, and the driving end of the lifting rod is connected to the ejector pin; The displacement sensor is arranged at the top of the ejector pin. The displacement sensor is used to monitor the change in the distance between the ejector pin and the sheet material to ensure the depth of penetration of the ejector pin into the sheet material.

[0037] Specifically, the lifting structure includes: a lifting rod and a displacement sensor; during the cup cover forming process, the upper mold 1 presses the lower mold 2 from top to bottom, at which time the first ejection block 22 squeezes the guide block 14, the elastic member becomes compressed, and at the same time the lifting rod is controlled to start, the lifting rod drives the ejector to move, and when the displacement sensor detects that the distance change between the ejector and the sheet reaches a set threshold, the lifting rod drives the ejector to move away from the sheet to ensure the depth of the ejector penetrating the sheet, thereby avoiding the phenomenon that the ejector of the cup cover is not easy to fall off during processing; Specifically, in this embodiment, the lifting rod is an electric lifting rod or a pneumatic lifting rod.

[0038] In some embodiments, the edges of the second ejection block 23 and the first ejection block 22 are arc-shaped.

[0039] Specifically, the second ejector block 23 is arranged corresponding to the drinking port, and the second ejector block 23 is used to form a protrusion adapted thereto on the surface of the cup cover so that the surface of the cup cover forms a specific shape; in this embodiment, the edges of the first ejector block 22 and the second ejector block 23 are arc-shaped, which avoids the edges of the protrusions on the cup cover from being subjected to excessive force and causing defects, thereby reducing the production of defective products.

[0040] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with the technical features with similar functions disclosed in this application (but not limited to) by each other.

Claims

1. A cup lid forming device suitable for biodegradable materials, characterized in that: include: An upper mold (1), a lower mold (2) and a gripping device; The surface of the upper mold (1) close to the lower mold (2) has a plurality of first molding cavities (11), and a punching assembly is arranged in the first molding cavity (11), and the punching assembly is used for punching edges and holes during the cup cover molding process; The surface of the lower mold (2) close to the upper mold (1) has a plurality of second molding cavities (21), and the second molding cavities (21) are arranged in a one-to-one correspondence with the first molding cavities (11); a molding component is arranged inside the second molding cavity (21), and the molding component is used to mold the sheet material into a cup cover; The grabbing device is used to take out a plurality of processed cup lids at the same time and automatically align them.

2. The cup cover forming device suitable for biodegradable materials according to claim 1, characterized in that: The molding assembly comprises: a first ejection block (22), a second ejection block (23) and an air suction member (24); the air suction member (24) is arranged between the first ejection block (22) and the second ejection block (23); the air suction member (24) is communicated with a vacuum assembly; the air suction member (24) is used to suck the sheet material during the cup cover molding process; a support structure (25) is arranged at the bottom of the air suction member (24); the interior of the support structure (25) is hollow; the support structure (25) is communicated with the air suction member (24); the support structure (25) is used to leave a gap between the edge of the cup cover and the surface of the lower mold (2) close to the upper mold (1), so as to avoid the formation of a negative pressure cavity between the cup cover and the second molding cavity (21).

3. The cup cover forming device suitable for biodegradable materials according to claim 2, characterized in that: A mold pad (26) is provided on the surface of the lower mold (2) close to the upper mold (1); the second molding cavity (21) passes through the mold pad (26); and a plurality of first air holes (27) in communication with the second molding cavity (21) are provided on the side wall of the mold pad (26).

4. The cup cover forming device suitable for biodegradable materials according to claim 3, characterized in that: A plurality of second air holes (28) communicating with the second molding cavity (21) are provided on the side wall of the lower mold (2).

5. The cup cover forming device suitable for biodegradable materials according to claim 2, characterized in that: The punching assembly comprises: a first cutting piece (12), a second cutting piece (13) and a punching structure, wherein the first cutting piece (12) circumferentially surrounds the edge of the first molding cavity (11) and is located on a side close to the second molding cavity (21), and the first cutting piece (12) is used to cut out the edge of the cup cover; the second cutting piece (13) is arranged in the first molding cavity (11) and corresponds to the second ejection block (23), and the second cutting piece (13) is used to cut out a drinking opening; the punching structure is arranged in the first molding cavity (11) and corresponds to the first ejection block (22), and the punching structure is used to form an air outlet.

6. The cup cover forming device suitable for biodegradable materials according to claim 5, characterized in that: The punching structure comprises: A guide block (14), the guide block (14) being arranged in the first molding cavity (11), an elastic member being arranged at the bottom of the guide block (14), the elastic member being arranged at the bottom of the guide block (14), one end of the elastic member being connected to the guide block (14), and the other end of the elastic member being connected to the bottom wall of the first molding cavity (11); at least one first through hole (15) being arranged on the guide block (14) along a first direction; the first direction being perpendicular to the bottom wall of the first molding cavity (11); An ejector pin, the ejector pin being arranged in the first molding cavity (11) along the first direction, and one end of the ejector pin extending into the first through hole (15); The elastic member has a first state and a second state. When in the first state, the elastic member is in a released state, at which time the ejector pin is in the first through hole (15); when in the second state, the elastic member is in a compressed state, at which time the ejector pin protrudes from the first through hole (15) and punches the sheet material to form the vent hole.

7. The cup cover forming device suitable for biodegradable materials according to claim 6, characterized in that: A lifting structure is provided at the bottom of the ejector pin, and the lifting structure is used to control the extension height of the ejector pin.

8. The cup cover forming device suitable for biodegradable materials according to claim 7, characterized in that: The lifting structure comprises: A lifting rod, the lifting rod being arranged in the upper mold (1), one end of the lifting rod extending into the first molding cavity (11), and a driving end of the lifting rod being connected to the ejector pin; A displacement sensor is arranged at the top of the ejector pin, and is used to monitor the change in the distance between the ejector pin and the sheet material to ensure the depth of penetration of the ejector pin into the sheet material.

9. The cup cover forming device suitable for biodegradable materials according to claim 2, characterized in that: The edges of the second ejection block (23) and the first ejection block (22) are arc-shaped.

10. The cup lid forming device suitable for biodegradable materials according to claim 1, characterized in that: The grasping device comprises: a mechanical arm, a driving end of the mechanical arm is connected to a connecting plate, a bottom of the connecting plate is provided with a plurality of suction cups, and the suction cups are provided in a one-to-one correspondence with the second molding cavity (21).

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