A pressing device for EPS foam box production

Abstract

The utility model relates to foamed box production technical field, concretely is a kind of pressing device for EPS foamed box production, including rack, the lower mould that can expand outward is installed in the rack, the top of lower mould is installed with upper mould;By setting lower mould, material pushing subassembly, trigger subassembly and transmission assembly, material pushing initial stage, trigger subassembly forces side plate to slide outward by overcoming spring force, expand lower mould forming cavity size, reduce the friction of foamed box and side plate, especially applicable to deep cavity foamed box, not only effectively avoid the box body deformation or chipping caused by friction in traditional material pushing process, but also avoid the bottom breakage caused by the greater stripping resistance of ejector rod, help to improve product pass rate;In addition, the linkage of upper mould lifting and transmission assembly realizes the synchronous triggering of material pushing action and mold opening process, and trigger subassembly is also linked with ejector rod, so the continuous process of mold opening, expansion and material pushing can be automatically completed without additional power source, realize the lossless quick ejection of foamed box.

Description

Technical Field

[0001] This utility model relates to the field of foam box production technology, and in particular to a pressing device for EPS foam box production. Background Technology

[0002] Foam insulated boxes are outer packaging containers made from expandable polystyrene (EPS) foam plastic. Due to their excellent thermal insulation properties, they are widely used in low-temperature transportation and preservation of food, medicine, biological agents and other items. In the production process, the pre-expanded foam particles are heated and pressurized by pressing equipment to make the particles tightly fuse together and form a box with good sealing performance and structural strength.

[0003] A pressing device for EPS foam box production disclosed in Chinese Patent Publication No. CN215619515U improves the heat dissipation efficiency of the mold by setting a cooling channel inside the mold, thereby accelerating the cooling of the foam box after molding. However, according to the related technology and existing technology, traditional pressing devices for EPS foam box production have large friction between the side wall of the foam box and the mold cavity during demolding, especially for deep cavity structure products. Friction can easily cause deformation or chipping of the side wall of the box. At the same time, when the ejector rod acts directly on the thin-walled bottom, the bottom is easily damaged due to the large demolding resistance, which affects the product qualification rate. In addition, its ejection action mostly relies on additional drive equipment for independent control, lacking linkage with the mold opening process, resulting in poor process connection and reducing molding continuity and production efficiency. Utility Model Content

[0004] The purpose of this utility model is to overcome the shortcomings of the prior art, solve the problems mentioned in the background art, and provide a pressing device for EPS foam box production.

[0005] The purpose of this utility model is achieved through the following technical solution: a pressing device for EPS foam box production, including a frame, a lower mold capable of outward expansion installed inside the frame, an upper mold installed on the top of the lower mold, a hydraulic cylinder for controlling the lifting and lowering of the upper mold fixed on the top of the frame, a top material assembly for pushing the foam box out of the mold provided at the bottom of the lower mold, triggering components for controlling the outward expansion of the lower mold provided around the top of the top material assembly, and transmission components for controlling the lifting and lowering of the top material assembly provided at the four corners of the lower mold.

[0006] Preferably, the lower mold includes a mold frame fixed inside the machine frame, a bottom plate is fixedly provided on the top of the mold frame, and side plates are provided on all four sides of the bottom plate. The four side plates are slidably installed on the top of the mold frame, and two springs for pressing the side plates are fixedly provided on all four sides of the top of the mold frame.

[0007] Preferably, the ejector assembly includes a drive plate slidably disposed at the bottom of the mold frame, and ejector rods are fixedly provided at the four corners of the base plate on the drive plate. Movable rods are fixedly provided at the top of the ejector rods, and ejector heads are installed at the top of the movable rods. The four ejector heads are vertically slidably installed inside the base plate.

[0008] Preferably, the triggering assembly includes a triggering bar fixed to the inner side of the bottom of the side plate, and a rotating roller is rotatably mounted on the side of the triggering bar facing the top rod.

[0009] Preferably, the rotating roller contacts the top of the top rod, and each top rod has a ramp at the contact position with the rotating roller to push the rotating roller outward. A limiting plate is fixedly provided at the top of each movable rod, and a groove for the limiting plate to slide vertically is provided inside each top material head.

[0010] Preferably, the transmission assembly includes a guide sleeve fixed to one corner of the drive plate, a guide post vertically slidably installed inside the guide sleeve, the top end of the guide post fixed to one corner of the lower mold, a stroke block fixedly provided at the lower end of the guide post, and a stroke groove for limiting the stroke of the stroke block provided inside the guide sleeve.

[0011] Preferably, each of the side plates has an internal cavity for heating and cooling, and two water inlet pipes communicating with the cavity are fixed on the outer side of each side plate.

[0012] Preferably, a feeder for conveying foam particles is provided at the center of the base plate.

[0013] Preferably, each of the side plates has a trapezoidal groove on its top, and the upper mold has a trapezoidal strip fixedly provided at the position of each trapezoidal groove.

[0014] Beneficial effects:

[0015] This pressing device for EPS foam box production, through the setting of a lower mold, an ejector assembly, a trigger assembly, and a transmission assembly, allows the side plates to slide outward against the spring force during the initial ejection stage, expanding the size of the lower mold forming cavity and reducing the friction between the foam box and the side plates. It is especially suitable for deep-cavity foam boxes, effectively avoiding box deformation or chipping caused by friction during traditional ejection processes, and also preventing bottom damage caused by the large demolding resistance of the ejector rod, thus helping to improve the product qualification rate. In addition, the linkage between the upper mold lifting and the transmission assembly realizes the synchronous triggering of the ejection action and the mold opening process. At the same time, the trigger assembly is linked with the ejector rod, which can automatically complete the continuous process of mold opening, expansion, and ejection without an additional power source, realizing the non-destructive and rapid ejection of foam boxes and improving the continuity of production. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the appearance of the present utility model;

[0019] Figure 3 This utility model Figure 1 A magnified schematic diagram of the local structure at point A;

[0020] Figure 4 This utility model Figure 1 A magnified schematic diagram of the local structure at point B;

[0021] Figure 5 This utility model Figure 1 A magnified schematic diagram of the local structure at point C;

[0022] Figure 6 This is a schematic diagram of the slope structure of this utility model;

[0023] Figure 7 This is a schematic diagram showing the fit between the upper and lower molds of this utility model;

[0024] Figure 8 This is a schematic diagram of the lower mold of this utility model;

[0025] Figure 9 This is a schematic diagram showing the state of the trigger component when the side plate of this utility model expands outward;

[0026] Figure 10 This utility model Figure 9 A magnified schematic diagram of the structure at point D.

[0027] In the diagram: 1. Frame; 2. Lower mold; 21. Mold frame; 22. Base plate; 23. Side plate; 24. Spring; 3. Hydraulic cylinder; 4. Upper mold; 5. Transmission assembly; 51. Guide sleeve; 52. Guide post; 53. Stroke block; 54. Stroke groove; 6. Ejector assembly; 61. Drive plate; 62. Ejector rod; 621. Ramp; 63. Ejector head; 631. Movable groove; 64. Movable rod; 641. Limiting plate; 7. Trigger assembly; 71. Trigger bar; 72. Rotary roller; 8. Cavity; 9. Water inlet pipe; 10. Trapezoidal bar; 11. Trapezoidal groove; 12. Conveyor. Detailed Implementation

[0028] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0029] Additional aspects and advantages of this invention will be further set forth in the description which follows in conjunction with the accompanying drawings, and in part will be obvious from the description or may be learned by practice of the invention.

[0030] like Figures 1 to 10 As shown, a pressing device for producing EPS foam boxes includes a frame 1, a lower mold 2 capable of outward expansion installed inside the frame 1, an upper mold 4 installed on top of the lower mold 2, a hydraulic cylinder 3 fixedly installed on the top of the frame 1 for controlling the lifting and lowering of the upper mold 4, an ejector assembly 6 for pushing the foam box out of the mold at the bottom of the lower mold 2, triggering components 7 for controlling the outward expansion of the lower mold 2 around the top of the ejector assembly 6, and transmission components 5 for controlling the lifting and lowering of the ejector assembly 6 at the four corners of the lower mold 2. After the foam box is formed, the frame 1 supports the hydraulic cylinder 3 to control the upper mold 4 to open upward. During this process, the upper mold 4 drives the ejector assembly 6 to move through the transmission components 5 at the four corners, ejecting the formed foam box out of the lower mold 2 automatically without additional driving equipment. In the initial stage of ejection, the triggering components 7 force the lower mold 2 to automatically expand outward, increasing the size of the forming cavity of the lower mold 2, thereby reducing the demolding resistance of the foam box, facilitating demolding, and preventing damage to the foam box due to ejection, especially suitable for ejecting deep cavity foam boxes.

[0031] like Figure 1 , Figure 5 , Figure 7 and Figure 8As shown, the lower mold 2 includes a mold frame 21 fixed inside the frame 1. A base plate 22 is fixedly provided on the top of the mold frame 21. Side plates 23 are provided around the base plate 22. The four side plates 23 are slidably installed on the top of the mold frame 21. Two springs 24 for pressing the side plates 23 are fixedly provided around the top of the mold frame 21. Each side plate 23 has a cavity 8 for heating and cooling inside. Two water inlet pipes 9 communicating with the cavity 8 are fixedly provided on the outside of each side plate 23. A feeder 12 for conveying foam particles is provided at the center of the base plate 22. A trapezoidal groove 11 is provided on the top of each side plate 23. A trapezoidal strip 10 is fixedly provided on the upper mold 4 corresponding to the position of each trapezoidal groove 11. When the mold is closed, the trapezoidal strip 10 of the upper mold 4... The strip 10 is embedded in the trapezoidal groove 11 at the top of the side plate 23 to ensure accurate positioning during mold closing, while maintaining the position of the side plate 23 and improving the stability of the side plate 23 during molding. In the initial state, the side plate 23 is kept closed under the pressing action of the spring 24, and together with the bottom plate 22, it forms the foam box molding cavity. After the feeder 12 delivers foam particles into the molding cavity, the cavity 8 of the side plate 23 is vented with a heating medium (such as steam) through the water inlet pipe 9 to make the particles foam and form. After molding, the cooling water is switched to cool and solidify. After the foam box is cooled and solidified, the upper mold 4 is lifted, and then the side plate 23 slides outward against the elastic force of the spring 24, which expands the size of the molding cavity of the lower mold 2, reduces the demolding resistance of the foam box, and avoids damage to the foam box due to ejection.

[0032] like Figures 1 to 3 As shown, the ejector assembly 6 includes a drive plate 61 slidably disposed at the bottom of the mold frame 21. Ejector rods 62 are fixedly disposed at the four corners of the drive plate 61 corresponding to the base plate 22. Movable rods 64 are fixedly disposed at the top of the ejector rods 62. Ejector heads 63 are installed at the top of the movable rods 64. The four ejector heads 63 are vertically slidably disposed inside the base plate 22. When the drive plate 61 moves upward, the ejector rods 62 push the movable rods 64 and the ejector heads 63 at the top to rise along the vertical channel inside the base plate 22. The ejector heads 63 directly act on the bottom of the foam box, ejecting it out of the molding cavity.

[0033] like Figure 1 , Figure 3 , Figure 6 , Figure 9 and Figure 10As shown, the trigger assembly 7 includes a trigger bar 71 fixed to the inner bottom of the side plate 23. A rotating roller 72 is rotatably mounted on the side of the trigger bar 71 facing the push rod 62. The rotating roller 72 contacts the top of the push rod 62. Each push rod 62 has a ramp 621 at the contact point with the rotating roller 72 to push the rotating roller 72 outward. A limiting plate 641 is fixedly mounted on the top of each movable rod 64. Each ejector head 63 has a vertical sliding groove 631 for the limiting plate 641. In the initial ejection stage, the limiting plate 641 is at the lower end of the stroke of the sliding groove 631. At this time, the rise of the push rod 62 will push the limiting plate 641 through the movable rod 64. Sliding within the movable groove 631, the ramp 621 at the top of the ejector rod 62 contacts the rotating roller 72 on the trigger bar 71, forcing the rotating roller 72 to roll along the ramp 621. The lateral force generated by the upward movement of the ramp 621 will drive the trigger bar 71 and the side plate 23 to slide outward against the resistance of the spring 24, thereby expanding the size of the molding cavity, reducing the friction between the foam box and the side plate 23, and reducing the demolding resistance. When the limiting plate 641 moves to the upper end of the stroke of the movable groove 631, the ejector rod 62 will push the ejector head 63 upward through the movable rod 64 and the limiting plate 641 to eject the material, automatically realizing expansion before ejection, and improving the smoothness of the foam box ejection.

[0034] like Figure 1 , Figure 2 and Figure 4 As shown, the transmission assembly 5 includes a guide sleeve 51 fixed to one corner of the drive plate 61. A guide post 52 is vertically slidably installed inside the guide sleeve 51. The top end of the guide post 52 is fixed to one corner of the lower mold 2. A stroke block 53 is fixedly provided at the lower end of the guide post 52. A stroke groove 54 for limiting the stroke of the stroke block 53 is provided inside the guide sleeve 51. When the mold opens, the upper mold 4 drives the guide post 52 to rise synchronously. The stroke block 53 at the lower end of the guide post 52 slides in the stroke groove 54 of the guide sleeve 51. At this time, the drive plate 61 remains stationary. When the upper mold 4 just leaves the forming cavity of the lower mold 2, the stroke block 53 just moves to the end of the stroke groove 54. At this time, the rise of the guide post 52 will drive the guide sleeve 51 to rise synchronously, thereby controlling the rise of the drive plate 61 to perform the ejection action. The ejection action follows the mold opening. No additional drive equipment is required, and the whole process is continuous and efficient, improving the overall forming speed.

[0035] The work process is as follows:

[0036] S1: As Figure 1 , Figure 2 , Figure 5 and Figure 8As shown, the upper mold 4 descends under the drive of the hydraulic cylinder 3, and the trapezoidal strip 10 at its bottom is embedded in the trapezoidal groove 11 at the top of the side plate 23 of the lower mold 2, so as to achieve precise positioning and press the side plate 23. At this time, the side plate 23 is kept closed under the action of the spring 24, and together with the bottom plate 22, it forms a closed foam box molding cavity. Then the feeder 12 conveys EPS foam particles into the molding cavity through the center of the bottom plate 22 to complete the raw material filling.

[0037] S2: As Figure 1 and Figure 7 As shown, a heating medium (such as steam) is introduced into the cavity 8 inside the side plate 23 through the water inlet pipe 9 to heat and shape the foam particles in the molding cavity. After molding, cooling water is introduced into the cavity 8 to cool and shape the foam box.

[0038] S3: As Figure 1 , Figure 4 and Figure 9 As shown, after cooling and shaping, the hydraulic cylinder 3 drives the upper mold 4 to rise, and the upper mold 4 drives the guide post 52 to rise synchronously. The stroke block 53 at the lower end of the guide post 52 slides in the stroke groove 54 of the guide sleeve 51. At this time, the drive plate 61 remains stationary. When the upper mold 4 completely separates from the forming cavity of the lower mold 2, the stroke block 53 moves to the end of the stroke groove 54, and the guide post 52 drives the drive plate 61 to start moving upward through the guide sleeve 51, triggering the ejection action.

[0039] S4: As Figure 1 , Figure 3 , Figure 9 and Figure 10 As shown, in the initial stage of the drive plate 61 rising, the push rod 62 pushes the movable rod 64 and the push head 63 to move upward. The ramp 621 at the top of the push rod 62 contacts the rotating roller 72 on the trigger bar 71 at the bottom of the side plate 23, forcing the rotating roller 72 to roll along the ramp 621, generating a lateral force to drive the side plate 23 to slide outward against the resistance of the spring 24, thereby expanding the size of the molding cavity of the lower mold 2, reducing the friction between the foam box and the side plate 23, and preventing the foam box from being damaged by compression during demolding.

[0040] S5: As Figure 9 and Figure 10 As shown, as the drive plate 61 continues to rise, the limiting plate 641 on the movable rod 64 slides to the upper end of the stroke in the movable groove 631 of the top material head 63. At this time, the top rod 62 pushes the top material head 63 to rise along the vertical channel of the bottom plate 22 through the movable rod 64 and the limiting plate 641. The top material head 63 directly acts on the bottom of the foam box, and smoothly pushes it out of the molding cavity.

[0041] S6: As Figure 1 and Figure 2As shown, after the foam box is ejected, the hydraulic cylinder 3 drives the upper mold 4 to descend and reset. The guide post 52 descends with the upper mold 4, and the stroke block 53 drives the guide sleeve 51 and the drive plate 61 to move down. The ejector head 63 retracts into the bottom plate 22. At the same time, the side plate 23 slides inward under the reset action of the spring 24, re-closes to form the molding cavity, and enters the next production cycle.

[0042] The hydraulic cylinder 3 and the feeder 12 in this application are known technologies in this field, therefore their specific structures and working principles are not described in detail.

[0043] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A pressing device for producing EPS foam boxes, characterized in that: The device includes a frame (1), in which a lower mold (2) capable of expanding outward is installed. An upper mold (4) is installed on the top of the lower mold (2). A hydraulic cylinder (3) for controlling the lifting and lowering of the upper mold (4) is fixedly provided on the top of the frame (1). A top material assembly (6) for pushing the foam box out of the mold is provided at the bottom of the lower mold (2). Triggering components (7) for controlling the outward expansion of the lower mold (2) are provided around the top of the top of the top material assembly (6). Transmission components (5) for controlling the lifting and lowering of the top material assembly (6) are provided at the four corners of the lower mold (2).

2. The pressing device for EPS foam box production according to claim 1, characterized in that: The lower mold (2) includes a mold frame (21) fixed inside the frame (1). A base plate (22) is fixedly provided on the top of the mold frame (21). Side plates (23) are provided on all four sides of the base plate (22). The four side plates (23) are slidably installed on the top of the mold frame (21). Two springs (24) for pressing the side plates (23) are fixedly provided on all four sides of the top of the mold frame (21).

3. The pressing device for EPS foam box production according to claim 2, characterized in that: The ejector assembly (6) includes a drive plate (61) slidably disposed at the bottom of the mold frame (21). The drive plate (61) is fixedly provided with ejector rods (62) at the four corners of the base plate (22). The top of the ejector rods (62) is fixedly provided with movable rods (64). The top of the movable rods (64) is equipped with ejector heads (63). The four ejector heads (63) are vertically slidably installed inside the base plate (22).

4. The pressing device for EPS foam box production according to claim 3, characterized in that: The trigger assembly (7) includes a trigger bar (71) fixed to the inner bottom of the side plate (23), and a rotating roller (72) is rotatably mounted on the side of the trigger bar (71) facing the top rod (62).

5. The pressing device for EPS foam box production according to claim 4, characterized in that: The top of the rotating roller (72) contacts the top of the top rod (62). Each top rod (62) has a ramp (621) at the contact position with the rotating roller (72) for pushing the rotating roller (72) outward. Each movable rod (64) has a limiting plate (641) fixedly installed at the top. Each top material head (63) has a groove (631) inside for the limiting plate (641) to slide vertically.

6. The pressing device for EPS foam box production according to claim 3, characterized in that: The transmission assembly (5) includes a guide sleeve (51) fixed to one corner of the drive plate (61). A guide post (52) is vertically slidably installed inside the guide sleeve (51). The top end of the guide post (52) is fixed to one corner of the lower mold (2). A stroke block (53) is fixedly provided at the lower end of the guide post (52). A stroke groove (54) for limiting the stroke of the stroke block (53) is provided inside the guide sleeve (51).

7. A pressing device for EPS foam box production according to claim 2, characterized in that: Each of the side plates (23) has a cavity (8) for heating and cooling inside, and two water inlet pipes (9) connected to the cavity (8) are fixed on the outside of each side plate (23).

8. A pressing device for EPS foam box production according to claim 2, characterized in that: The bottom plate (22) is provided with a feeder (12) for conveying foam particles at the center.

9. A pressing device for EPS foam box production according to claim 2, characterized in that: Each of the side plates (23) has a trapezoidal groove (11) on its top, and the upper mold (4) has a trapezoidal strip (10) fixedly provided at the position of each trapezoidal groove (11).

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