A foam box rapid prototyping mold

Abstract

The invention discloses a foam box rapid prototyping mold, which relates to the field of foam molding technology, and comprises a base frame and a lower mold assembly and an upper mold assembly mounted on the base frame; the upper mold assembly is mounted on the base frame directly above the lower mold assembly through a hydraulic telescopic cylinder, the lower mold assembly is fixedly mounted on the base frame, and when the upper mold assembly and the lower mold assembly are molded together, a box-shaped molding cavity is formed between the upper mold assembly and the lower mold assembly, and the lower mold assembly is connected with a steam supply mechanism for introducing steam into the molding cavity; the lower mold assembly comprises a lower mold plate fixedly mounted on the base frame and a concave mold fixedly mounted on the top of the lower mold plate. The invention can quickly and evenly deliver pre-foamed raw material particles into the molding cavity, which not only improves the molding efficiency of the foam box, but also improves the quality of the finished foam box product. In addition, after the foam box is molded, the foam box can be automatically discharged from the concave mold under the action of the ejector pin and the gas, which further improves the molding efficiency of the foam box.

Description

Technical Field

[0001] The invention relates to the technical field of foam molding, in particular to a foam box rapid molding die. Background Art

[0002] Foam box is a box-type packaging container made of foam plastic (porous plastic). In the existing foam box forming mold, the blanking port is not easy to completely fit with the mold plane during the foaming process, resulting in bulges on the surface of the foam box after forming.

[0003] The Chinese patent publication number CN116118092B discloses an EPS foam plastic mold, which includes a mother mold, a processor is fixedly connected to the bottom of the middle part of the mother mold, a trigger rod is slidably connected to the middle part of the processor, and a support frame is fixedly connected to the upper end of the trigger rod. The patent uses a stuffing device to avoid bulges on the foam surface after molding.

[0004] However, this patent has certain defects during use: that is, in the process of feeding EPS particles into the mother mold and the sub-mold, due to the small gap between the mother mold and the sub-mold, the EPS particles are prone to blockage, which increases the feeding time of the EPS particles and causes the EPS particles to accumulate at the bottom of the mother mold and the sub-mold, affecting the quality of the finished foam box. Summary of the invention

[0005] The purpose of the present invention is to provide a foam box rapid prototyping mold to solve the problems raised in the above background technology.

[0006] In order to achieve the above-mentioned invention object, the present invention adopts the following technical scheme:

[0007] The present invention provides a foam box rapid prototyping mold, comprising a base frame and a lower mold assembly and an upper mold assembly mounted on the base frame; the upper mold assembly is mounted on the base frame directly above the lower mold assembly through a hydraulic telescopic cylinder, and the lower mold assembly is fixedly mounted on the base frame; when the upper mold assembly and the lower mold assembly are molded together, a box-shaped molding cavity is formed between the upper mold assembly and the lower mold assembly, and the lower mold assembly is connected to a steam supply mechanism for introducing steam into the molding cavity;

[0008] The lower die assembly comprises a lower die plate fixedly mounted on a base frame and a concave die fixedly mounted on the top of the lower die plate, wherein a concave die cavity is formed in the concave die; the upper die assembly comprises an upper die plate fixedly mounted on the base frame via a hydraulic telescopic cylinder and a convex die fixedly mounted on the bottom of the upper die plate;

[0009] A raw material input pipe is vertically arranged at the center of the bottom of the die, a raw material conveying channel is formed in the raw material input pipe, and the raw material conveying channel is connected with the die cavity, the bottom end of the raw material input pipe passes through the lower mold plate and is connected with a raw material supply pipe connected with the raw material conveying channel; a feeding assembly is installed in the raw material conveying channel;

[0010] The raw material conveying channel includes a diffusion section, a conveying section and a sliding section arranged in sequence from top to bottom, the diameter of the diffusion section decreases from top to bottom to form a truncated cone shape, the feeding assembly includes a sliding rotating part arranged in the sliding section, a spiral feeding part arranged in the conveying section, and a blocking part arranged in the diffusion section, wherein the raw material supply pipe is arranged vertically with the raw material input pipe, and the raw material supply pipe is connected with the conveying section;

[0011] The sliding rotating part includes a rotating column and a sealing bearing arranged on the outside of the rotating column, and the outer ring of the sealing bearing is slidably matched with the inner wall of the conveying section; and a first pre-tightening spring is arranged between the outer ring of the sealing bearing and the bottom end of the sliding section, and the rotating column is evenly penetrated by a spiral channel along the circumferential direction; the spiral feeding part includes a rotating shaft coaxially fixed on the top of the rotating column and spiral blades welded on the outside of the rotating shaft; the blocking part includes a blocking plate adapted to the top opening of the diffusion section, the blocking plate is fixed on the top of the rotating shaft, and the bottom end of the sliding section is connected to an air supply pipe; when feeding, an exhaust gap is left between the die and the punch.

[0012] Furthermore, the sealing part also includes a pushing structure, which includes a sleeve, a compression spring, and a pushing plate. The sleeve is sleeved on the rotating shaft between the sealing plate and the spiral blade, and the sleeve and the rotating shaft are axially slidably fitted through a keyway. The compression spring is arranged between the sleeve and the sealing plate, and the pushing plate is evenly fixed on the outer side of the sleeve along the circumferential direction. The pushing plate is inclined and is tightly attached to the inner wall of the diffusion section.

[0013] Furthermore, a cavity with an open top is formed in the convex mold, the upper mold plate blocks the cavity opening, and the upper mold plate is provided with an exhaust pipe connected to the cavity, and the convex mold is evenly penetrated with exhaust micropores connected to the cavity.

[0014] Furthermore, an ejector assembly is also arranged below the lower mold assembly, and the ejector assembly includes an ejector plate parallel to the lower mold plate and a driving structure for driving the ejectors to move vertically up and down. Ejectors are evenly arranged on the top of the ejector plate, and the ejectors penetrate the lower mold plate and the die and extend into the die cavity, and the ejectors are sealingly slidably matched with the die. A sealing portion with a diameter larger than the ejector is arranged on the top of the ejector, and when the ejector plate is at the lowest end of its moving stroke, the top surface of the sealing portion is flush with the top surface of the die cavity.

[0015] Furthermore, the driving structure includes four sliding columns vertically fixed at the top corner position of the ejector plate, the top end of each sliding column passes through the lower template and the upper template, the sliding column slides with the lower template and the upper template, and a limiting ring is provided at the top end of the sliding column, and the sliding column of the ejector plate and the lower template is provided with a second pre-tightening spring.

[0016] Furthermore, an air intake channel is formed at the inner center of the ejector pin, and an air intake hole connected to the air intake channel is provided on the ejector pin at the top of the air intake channel, and a pair of telescopic air cylinder structures are symmetrically provided between the ejector pin plate and the lower template, and the telescopic air cylinder structure is connected to the air intake channel of the ejector pin through a pipeline.

[0017] Furthermore, the telescopic air cylinder structure includes an air cylinder fixed on the ejector plate, a piston slidably arranged in the air cylinder, and a movable rod coaxially arranged with the top of the piston, and the top end of the movable rod penetrates the air cylinder and is fixedly connected to the base frame.

[0018] Furthermore, the width of the exhaust gap is 0.1-0.3 cm.

[0019] Compared with the prior art, one or more of the above technical solutions have the following beneficial effects:

[0020] The present invention can quickly and evenly deliver pre-foamed raw material particles into the molding cavity, which not only improves the molding efficiency of the foam box, but also improves the quality of the finished foam box. In addition, after the foam box of the present invention is molded, the foam box can be automatically discharged from the die under the action of the ejector pin and the gas, which further improves the molding efficiency of the foam box.

[0021] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0023] Figure 1 It is a schematic diagram of the first state structure of the present invention;

[0024] Figure 2 It is a schematic diagram of the structure of the second state of the present invention;

[0025] Figure 3 It is a schematic diagram of the structure of the third state of the present invention;

[0026] Figure 4 It is a schematic diagram of the top view of the structure of the present invention;

[0027] Figure 5 yes Figure 4 DD-direction structure diagram;

[0028] Figure 6 yes Figure 5 Schematic diagram of the local structure at A;

[0029] Figure 7 yes Figure 6 Schematic diagram of the structure during feeding;

[0030] Figure 8 yes Figure 6 Schematic diagram of the local structure at B;

[0031] Fig. 9 It is a schematic diagram of the cross-sectional structure of the concave mold of the present invention;

[0032] Fig.10 yes Fig. 9 Schematic diagram of the local structure at C;

[0033] Fig.11 It is a schematic structural diagram of the feeding assembly of the present invention from a first viewing angle;

[0034] Fig.12 It is a schematic structural diagram of the feeding assembly of the present invention from a second viewing angle;

[0035] Fig.13 yes Figure 2 Another perspective structural diagram of;

[0036] Fig.14 It is a front view structural schematic diagram of the upper mold assembly and the lower mold assembly of the present invention;

[0037] Fig.15 yes Fig.14 Schematic diagram of the E-E structure;

[0038] Fig.16 yes Fig.15 Schematic diagram of the local structure at F.

[0039] In the figure:

[0040] 1-base frame; 2-lower mold assembly; 21-lower mold plate; 22-die; 23-die cavity;

[0041] 3-upper die assembly; 31-upper die plate; 32-convex die;

[0042] 4-forming cavity; 5-hydraulic telescopic cylinder;

[0043] 6-raw material input pipe; 61-raw material conveying channel; 611-diffusion section; 612-conveying section; 613-sliding section; 62-raw material supply pipe; 63-air supply pipe;

[0044] 71-sliding rotating part; 711-rotating column; 712-sealed bearing; 713-first preload spring; 714-spiral channel; 72-spiral feeding part; 721-rotating shaft; 722-spiral blade; 73-blocking part; 731-blocking plate; 732-push structure; 7321-sleeve; 7322-compression spring; 7323-push plate;

[0045] 8-thimble assembly; 81-thimble plate; 811-sealing disk; 82-driving structure; 821-sliding column; 822-limiting ring; 823-second preload spring; 83-thimble; 831-intake channel; 832-intake hole; 84-telescopic air cylinder structure; 841-air cylinder; 842-piston; 843-movable rod. DETAILED DESCRIPTION

[0046] In order to enable those skilled in the art to better understand the 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 drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0047] See also Figure 1-Figure 16 The present invention provides a foam box rapid prototyping mold, comprising a base frame 1 and a lower mold assembly 2 and an upper mold assembly 3 mounted on the base frame 1; the upper mold assembly 3 is mounted on the base frame 1 directly above the lower mold assembly 2 through a hydraulic telescopic cylinder 5, and the lower mold assembly 2 is fixedly mounted on the base frame 1. When the upper mold assembly 3 and the lower mold assembly 2 are molded, Figure 6 As shown, a box-shaped molding cavity 4 is formed between the upper mold assembly 3 and the lower mold assembly 2 , and the lower mold assembly 2 is connected to a steam supply mechanism (not shown) for introducing steam into the molding cavity 4 .

[0048] When in use, the upper mold assembly 3 is driven up and down by the hydraulic telescopic cylinder 5 to complete the mold closing and opening of the lower mold assembly 2 and the upper mold assembly 3. When the upper mold assembly 3 and the lower mold assembly 2 complete the mold closing, the pre-foamed EPS particles (hereinafter referred to as raw material particles) are filled in the molding cavity 4, and steam is added to the molding cavity 4 through the steam supply mechanism to make the raw material particles expand again and fully fill the mold to form a foam box. The molding principle of the above-mentioned foam box is the existing technology and will not be elaborated here.

[0049] like Figure 1As shown, the lower mold assembly 2 includes a lower mold plate 21 fixedly mounted on the base frame 1 and a die 22 fixedly mounted on the top of the lower mold plate 21, and a die cavity 23 is formed in the die 22; the upper mold assembly 3 includes an upper mold plate 31 mounted on the base frame 1 through a hydraulic telescopic cylinder 5 and a punch 32 fixedly mounted on the bottom of the upper mold plate 31.

[0050] like Figure 1 , Figure 2 and Figure 6 As shown, when in use, the upper mold plate 31 is driven to move by the hydraulic telescopic cylinder 5, so that the punch 32 extends into the die cavity 23 of the die 22. When the die 22 and the punch 32 are molded together, the punch 32 can form the closed molding cavity 4 in the die cavity 23.

[0051] like Figure 8 As shown, a raw material input pipe 6 is vertically arranged at the center position of the bottom of the die 22, a raw material conveying channel 61 is formed in the raw material input pipe 6, and the raw material conveying channel 61 is connected with the die cavity 23, the bottom end of the raw material input pipe 6 passes through the lower mold plate 21 and is connected with a raw material supply pipe 62 connected with the raw material conveying channel 61; a feeding assembly is assembled in the raw material conveying channel 61.

[0052] like Figure 7 As shown, when the die 22 and the punch 32 are closed, the raw material particles are introduced into the raw material conveying channel 61 by the raw material supply pipe 62. After the raw material particles enter the raw material conveying channel 61, the feeding assembly can input the raw material particles into the molding cavity 4, and make the raw material particles quickly and evenly distributed in the molding cavity 4 after entering the molding cavity 4.

[0053] like Figure 8 As shown, the raw material conveying channel 61 includes a diffusion section 611, a conveying section 612 and a sliding section 613 which are arranged in sequence from top to bottom. The diameter of the diffusion section 611 decreases from top to bottom to form a truncated cone shape. The conveying section 612 and the sliding section 613 are both cylindrical. The feeding assembly includes a sliding rotating part 71 arranged in the sliding section 613, a spiral feeding part 72 arranged in the conveying section 612 and a blocking part 73 arranged in the diffusion section 611, wherein the raw material supply pipe 62 is vertically arranged with the raw material input pipe 6, and the raw material supply pipe 62 is connected with the conveying section 612.

[0054] Among them, the sliding rotating part 71 is limited in the sliding section 613 of the raw material conveying channel 61. The sliding rotating part 71 can rotate in the sliding section 613 and can slide axially along the sliding section 613, so that the entire feeding component can rotate and slide axially along the raw material conveying channel 61, completing the feeding action and the opening and blocking of the raw material conveying channel 61.

[0055] The spiral feeder 72 in the conveying section 612 mainly serves to convey the raw material particles. The spiral feeder 72 can rotate together with the sliding rotating section 71 to convey the raw material particles to the diffusion section 611 .

[0056] Among them, the blocking part 73 is in the diffusion section 611 and mainly plays a blocking role. The blocking part 73 can move toward the molding cavity 4 together with the sliding rotating part 71 during the raw material particle conveying process to release the blockage of the diffusion section 611. After completing the raw material particle conveying work, it moves away from the molding cavity 4 together with the sliding rotating part 71 to block the diffusion section 611.

[0057] It should be supplemented that the truncated cone design of the diffusion section 611 of the present invention, i.e., a design with a large opening at the upper end and a small opening at the lower end, can make the raw material particles diffuse better toward the periphery after entering the molding cavity 4, so that the raw material particles are quickly and evenly distributed in the molding cavity 4, shortening the feeding time, thereby improving the foam box molding efficiency.

[0058] like Figure 8-Figure 12 As shown, specifically, the sliding rotating part 71 includes a rotating column 711 and a sealing bearing 712 arranged on the outside of the rotating column 711, the outer ring of the sealing bearing 712 is slidably matched with the inner wall of the conveying section 612; and a first preload spring 713 is arranged between the outer ring of the sealing bearing 712 and the bottom end of the sliding section 613, and the rotating column 711 is evenly penetrated by a spiral channel 714 along the circumferential direction; the spiral feeding part 72 includes a rotating shaft 721 coaxially fixed on the top of the rotating column 711 and a spiral blade 722 welded on the outside of the rotating shaft 721; the blocking part 73 includes a blocking plate 731 adapted to the top opening of the diffusion section 611, the blocking plate 731 is fixed on the top of the rotating shaft 721, and the bottom end of the sliding section 613 is connected to the air supply pipe 63; when feeding, as shown in FIG. Figure 6 and Figure 7 As shown, an exhaust gap is left between the concave mold 22 and the convex mold 32. In a specific embodiment, the width of the exhaust gap is 0.1-0.3 cm.

[0059] When the feeding assembly is not started, under the action of the first preload spring 713, the sealing bearing 712 and the rotating column 711 are at the lowest end of their sliding stroke. At this time, the blocking plate 731 is tightly attached to the top opening of the diffusion section 611, so that the raw material conveying channel 61 is blocked, and the bottom of the molding cavity 4 forms a flat plane.

[0060] like Figure 7 As shown, when the feeding assembly is started, gas is supplied to the sliding section 613 through the gas supply pipe 63, and the gas passes through the spiral channel 714 of the rotating column 711, the conveying section 612, and the diffusion section 611 in sequence and is discharged into the molding cavity 4, and then discharged to the outside through the exhaust gap left between the die 22 and the punch 32.

[0061] After the gas enters the sliding section 613, under the action of gas impact and gas pressure, the rotating column 711 and the sealed bearing 712 will move toward the conveying section 612 together and stretch the first preload spring 713 until the rotating column 711 and the sealed bearing 712 move to the uppermost end of their sliding stroke, and the rotating column 711 and the sealed bearing 712 stop moving. During this process, the movement of the rotating column 711 and the sealed bearing 712 can move the sealing plate 731 toward the molding cavity 4 through the rotating shaft 721 to release the blockage of the diffusion section 611.

[0062] When the above-mentioned gas passes through the spiral channel 714 of the rotating column 711, it can cause the rotating column 711 to rotate, and then the rotating shaft 721 to rotate. The rotating shaft 721 rotates through the spiral blades 722 on the outside to transport the raw material particles in the conveying section 612. During this process, the gas moves from the conveying section 612 to the diffusion section 611, which can assist the spiral blades 722 in transporting the raw material particles, thereby improving the conveying efficiency of the raw material particles. After the raw material particles are transported to the diffusion section 611, the gas will carry the raw material particles to diffuse rapidly toward the periphery, thereby making the raw material particles evenly and quickly distributed in the molding cavity 4, which on the one hand improves the molding efficiency of the foam box, and on the other hand improves the quality of the finished product of the foam box.

[0063] like Figure 10-12 As shown, in a specific embodiment of the present invention, the sealing portion 73 also includes a pushing structure 732, and the pushing structure 732 includes a sleeve 7321, a compression spring 7322 and a pushing plate 7323. The sleeve 7321 is sleeved on the rotating shaft 721 between the sealing plate 731 and the spiral blade 722, and the sleeve 7321 and the rotating shaft 721 are axially slidably matched through a keyway. The compression spring 7322 is arranged between the sleeve 7321 and the sealing plate 731, and the outer side of the sleeve 7321 is evenly fixed with the pushing plate 7323 along the circumferential direction. The pushing plate 7323 is inclined, and the pushing plate 7323 is tightly attached to the inner wall of the diffusion section 611. The stiffness coefficient of the compression spring 7322 is smaller than the stiffness coefficient of the first preload spring 713.

[0064] Based on the above design, when the feeding assembly is not started, the blocking plate 731 blocks the opening of the diffusion section 611. At this time, the compression spring 7322 is in a compressed state, and the push plate 7323 is in contact with the inner wall of the diffusion section 611. When the feeding assembly is started, the blocking plate 731 is disengaged from the opening of the diffusion section 611. At this time, the compression spring 7322 is extended, but it is still in a compressed state, and the push plate 7323 is still in contact with the inner wall of the diffusion section 611. When the raw material particles enter the diffusion section 611, the rotating shaft 721 can drive the push plate 7323 to rotate through the sleeve 7321, and the push plate 7323 can push the raw material particles, so that the raw material particles are quickly discharged from the diffusion section 611 and diffused toward the periphery, so as to shorten the feeding time and thus improve the foam box molding efficiency.

[0065] like Figure 6 As shown, in a specific embodiment of the present invention, a cavity with an open top is formed in the punch 32, the upper mold 31 blocks the opening of the cavity, and the upper mold 31 is provided with an exhaust pipe connected to the cavity, and the punch 32 is evenly penetrated with exhaust micropores (not shown) connected to the cavity.

[0066] Based on the above design, during the foam box molding process, steam can seep out from the exhaust pores to avoid excessive local air pressure in the molding cavity 4, which causes the expanded raw material to be unable to completely fill the molding cavity, thereby avoiding the appearance of bubble holes on the surface and inside of the molded foam box and improving the aesthetics and strength of the foam box.

[0067] like Fig.13 As shown, in a specific embodiment of the present invention, an ejector assembly 8 is arranged below the lower mold assembly 2, and the ejector assembly 8 includes an ejector plate 81 parallel to the lower mold plate 21 and a driving structure 82 for driving the ejector 83 to move vertically up and down, and the top of the ejector plate 81 is evenly provided with ejectors 83, and the ejector 83 penetrates the lower mold plate 21 and the concave mold 22 and extends into the concave mold cavity 23, and the ejector 83 is sealed and slidably matched with the concave mold 22, as shown in FIG. Fig.16 As shown, a sealing disk 811 having a diameter larger than that of the ejector 83 is disposed at the top end of the ejector pin 83 . When the ejector plate 81 is at the lowest end of its moving stroke, the top surface of the sealing disk 811 is flush with the top surface of the concave mold cavity 23 .

[0068] Based on the above design, during the molding process of the foam box, the ejector plate 81 is at the lowest end of its moving stroke, and the ejector pin 83 can seal the molding cavity 4 at this position through its sealing disk 811. After the foam box is molded and the mold is opened, the driving structure 82 can drive the ejector plate 81 to move upward, thereby automatically ejecting the foam box through the ejector pin 83.

[0069] like Fig.13As shown, in a specific embodiment of the present invention, the driving structure 82 includes four sliding columns 821 vertically fixed at the top corner position of the ejector plate 81, the top end of each sliding column 821 passes through the lower template 21 and the upper template 31, and the sliding column 821 is slidably matched with the lower template 21 and the upper template 31, and a limiting ring 822 is provided at the top end of the sliding column 821, and a second preload spring 823 is provided on the outer side of the sliding column 821 of the ejector plate 81 and the lower template 21.

[0070] Based on the above design, after the foam box is formed, the hydraulic telescopic cylinder 5 can drive the upper template 31 to move upward, thereby driving the punch 32 to separate from the die 22. During this process, the ejector plate 81 is in a stationary state, and the punch 32 can be separated from the foam box; when the punch 32 is completely separated from the foam box, the upper template 31 contacts the limit ring 822 of the sliding column 821 (such as Figure 1 As shown in FIG. 1 , at this time, the upper mold plate 31 continues to move upward to drive the sliding column 821 to move upward, thereby causing the ejector plate 81 to move upward together, so that the foam box is ejected from the concave mold cavity 23 by the ejector pin 83, completing the separation of the foam box and the concave mold 22 (as shown in FIG. 1 ). Figure 3 as shown).

[0071] like Fig.16 As shown, further, an air inlet channel 831 is formed at the inner center of the ejector pin 83, and an air inlet hole 832 communicating with the air inlet channel 831 is provided on the ejector pin 83 at the top of the air inlet channel 831. Fig.13 As shown, a pair of telescopic air cylinder structures 84 are symmetrically arranged between the ejector plate 81 and the lower mold plate 21, and the telescopic air cylinder structures 84 are connected to the air inlet channel 831 of the ejector 83 through a pipeline. Figure 5 As shown, the telescopic air cylinder structure 84 includes an air cylinder 841 fixed on the ejector plate 81, a piston 842 slidably disposed in the air cylinder 841, and a movable rod 843 coaxially disposed with the top of the piston 842, and the top end of the movable rod 843 penetrates the air cylinder 841 and is fixedly connected to the base frame 1.

[0072] Based on the above design, when the ejector plate 81 drives the ejector pin 83 upward to eject the foam box, the piston 842 can move downward in the air cylinder 841 to discharge the air in the air cylinder 841 from the pipeline into the air inlet channel 831 of the ejector pin 83, and then enter the concave mold cavity 23 at the bottom of the foam box through the air inlet hole 832. The air can form a certain positive pressure at the bottom of the foam box to assist the ejector pin to eject the foam box through the gas, thereby avoiding damage to the foam box.

[0073] It is worth mentioning that the gas enters the concave mold cavity 23 at the bottom of the foam box and penetrates into the space between the foam box and the inner wall of the concave mold cavity 23 , thereby facilitating the separation of the foam box and the concave mold 22 .

[0074] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A foam box rapid prototyping mold, comprising a base frame and a lower mold assembly and an upper mold assembly mounted on the base frame; the upper mold assembly is mounted on the base frame directly above the lower mold assembly through a hydraulic telescopic cylinder, the lower mold assembly is fixedly mounted on the base frame, when the upper mold assembly and the lower mold assembly are molded together, a box-shaped molding cavity is formed between the upper mold assembly and the lower mold assembly, and the lower mold assembly is connected to a steam supply mechanism for introducing steam into the molding cavity; It is characterized in that The lower die assembly comprises a lower die plate fixedly mounted on a base frame and a concave die fixedly mounted on the top of the lower die plate, wherein a concave die cavity is formed in the concave die; the upper die assembly comprises an upper die plate fixedly mounted on the base frame via a hydraulic telescopic cylinder and a convex die fixedly mounted on the bottom of the upper die plate; A raw material input pipe is vertically arranged at the center of the bottom of the die, a raw material conveying channel is formed in the raw material input pipe, and the raw material conveying channel is connected with the die cavity, the bottom end of the raw material input pipe passes through the lower mold plate and is connected with a raw material supply pipe connected with the raw material conveying channel; a feeding assembly is installed in the raw material conveying channel; The raw material conveying channel includes a diffusion section, a conveying section and a sliding section arranged in sequence from top to bottom, the diameter of the diffusion section decreases from top to bottom to form a truncated cone shape, the feeding assembly includes a sliding rotating part arranged in the sliding section, a spiral feeding part arranged in the conveying section, and a blocking part arranged in the diffusion section, wherein the raw material supply pipe is arranged vertically with the raw material input pipe, and the raw material supply pipe is connected with the conveying section; The sliding rotating part includes a rotating column and a sealing bearing arranged on the outside of the rotating column, and the outer ring of the sealing bearing is slidably matched with the inner wall of the conveying section; and a first pre-tightening spring is arranged between the outer ring of the sealing bearing and the bottom end of the sliding section, and the rotating column is evenly penetrated by a spiral channel along the circumferential direction; the spiral feeding part includes a rotating shaft coaxially fixed on the top of the rotating column and spiral blades welded on the outside of the rotating shaft; the blocking part includes a blocking plate adapted to the top opening of the diffusion section, the blocking plate is fixed on the top of the rotating shaft, and the bottom end of the sliding section is connected to an air supply pipe; when feeding, an exhaust gap is left between the die and the punch.

2. The foam box rapid prototyping mold according to claim 1, characterized in that: The sealing part also includes a pushing structure, which includes a sleeve, a compression spring, and a pushing plate. The sleeve is sleeved on the rotating shaft between the sealing plate and the spiral blade, and the sleeve and the rotating shaft are axially slidably matched through a keyway. The compression spring is arranged between the sleeve and the sealing plate. The outer side of the sleeve is evenly fixed with the pushing plate along the circumferential direction. The pushing plate is inclined and is tightly attached to the inner wall of the diffusion section.

3. The foam box rapid prototyping mold according to claim 1, characterized in that: A cavity with an open top is formed in the convex mold, the upper mold plate blocks the cavity opening, and the upper mold plate is provided with an exhaust pipe connected to the cavity. Exhaust micropores connected to the cavity are evenly penetrated on the convex mold.

4. The foam box rapid prototyping mold according to claim 3, characterized in that: An ejector assembly is also arranged below the lower mold assembly, and the ejector assembly includes an ejector plate parallel to the lower mold plate and a driving structure for driving the ejectors to move vertically up and down. Ejectors are evenly arranged on the top of the ejector plate, and the ejectors penetrate the lower mold plate and the die and extend into the die cavity. The ejectors are sealingly slidably matched with the die. A blocking portion with a diameter larger than that of the ejector is arranged on the top of the ejector, and when the ejector plate is at the lowest end of its moving stroke, the top surface of the blocking portion is flush with the top surface of the die cavity.

5. The foam box rapid prototyping mold according to claim 4, characterized in that: The driving structure includes four sliding columns vertically fixed at the top corners of the ejector plate, the top of each sliding column passes through the lower template and the upper template, the sliding column is slidably matched with the lower template and the upper template, and a limiting ring is provided at the top of the sliding column, and the sliding column of the ejector plate and the lower template is provided with a second preload spring.

6. The foam box rapid prototyping mold according to claim 4, characterized in that: An air intake channel is formed at the inner center of the ejector pin, and an air intake hole connected to the air intake channel is arranged on the ejector pin at the top of the air intake channel. A pair of telescopic air cylinder structures are symmetrically arranged between the ejector pin plate and the lower template, and the telescopic air cylinder structures are connected to the air intake channel of the ejector pin through a pipeline.

7. The foam box rapid prototyping mold according to claim 6, characterized in that: The telescopic air cylinder structure comprises an air cylinder fixed on an ejector plate, a piston slidably arranged in the air cylinder, and a movable rod coaxially arranged with the top of the piston, wherein the top end of the movable rod penetrates the air cylinder and is fixedly connected to the base frame.

8. The foam box rapid prototyping mold according to claim 1, characterized in that: The width of the exhaust gap is 0.1-0.3 cm.

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