Thin-wall deep-cavity plastic garbage can injection molding mold with gas cap demolding mechanism

Abstract

The utility model provides a thin-wall deep-cavity plastic garbage can injection molding mold with a gas cap demolding mechanism, and belongs to the technical field of molds. The die comprises an upper die plate, a middle die plate and a lower die plate, an inwards-sunken forming groove is formed in the lower die plate, the bottom of the middle die plate is inserted into the forming groove, a middle cavity is vertically formed in the middle die plate in a penetrating mode, a middle insert inserted into the middle cavity is further arranged on the lower die plate, and the middle insert is inserted into the middle cavity. The upper die plate, the middle cavity, the middle insert and the lower die plate are combined to form a forming cavity with a downward opening, and a damage-free ejection mechanism is arranged on the lower die plate. The forming cavity formed by combining the upper mold plate, the middle cavity, the middle insert and the lower mold plate can form the thin-wall garbage can in an injection molding mode, and the damage-free ejection mechanism arranged on the lower mold plate can apply thrust to the bottom of the thin-wall garbage can and the opening side of the thin-wall garbage can at the same time so that the garbage can can be stressed more evenly when ejected out. Therefore, the garbage can is prevented from being damaged during ejection.

Description

Technical Field

[0001] The utility model belongs to the technical field of molds and relates to an injection molding mold for a thin-walled deep-cavity plastic trash can with an air-cap demoulding mechanism. Background Art

[0002] Plastic trash cans are generally made by injection molding, but in the prior art, plastic trash cans mostly use a top plate to apply thrust to the bottom of the trash can opening side to eject the product, but thin-walled plastic trash cans are easily damaged when the top plate is used to eject the thin wall.

[0003] For example, a Chinese patent discloses a trash can injection mold [application number: 201922187226.8], which includes a movable mold and a fixed mold, wherein a mold core is provided on the movable mold, a mold cavity is provided on the fixed mold, a cavity for molding the trash can is formed between the mold core and the mold cavity, and a gate connected to the mold cavity is provided on the side of the fixed mold facing away from the movable mold; a discharge assembly is provided on the movable mold at the root of the mold core, and the discharge assembly is assembled to be able to eject the trash can on the mold core toward the direction of the fixed mold when the movable mold is separated from the fixed mold. Utility Model Content

[0004] The utility model aims to solve the above problems and provides a thin-walled deep-cavity plastic trash can injection molding mold with an air-top demoulding mechanism.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A thin-walled deep-cavity plastic trash can injection molding mold with an air-cap demoulding mechanism comprises an upper template, a middle template and a lower template. The lower template is provided with an inwardly recessed molding groove, the bottom of the middle template is inserted into the molding groove, an intermediate cavity is vertically penetrated in the middle template, and the lower template is also provided with an intermediate insert inserted into the intermediate cavity. The upper template, the intermediate cavity, the intermediate insert and the lower template are combined to form a molding cavity with an opening facing downward, and the lower template is provided with a non-destructive ejection mechanism.

[0007] In the above-mentioned thin-walled deep-cavity plastic trash can injection molding mold with an air-top demoulding mechanism, the non-destructive ejection mechanism includes an air-top demoulding structure and a top plate ejection assembly.

[0008] In the above-mentioned thin-walled deep-cavity plastic trash can injection molding mold with an air-top demolding mechanism, the air-top demolding structure includes two lower air-top blocks arranged on the top of the middle insert, and the lower air-top blocks are connected to the middle insert through springs. The middle insert also has a lower air-top flow channel connected to the bottom of the lower air-top block.

[0009] In the above-mentioned thin-walled deep-cavity plastic trash can injection molding mold with an air-top demolding mechanism, the air-top demolding structure includes two upper air-top blocks arranged at the bottom of the upper mold plate, the upper air-top blocks are connected to the upper mold plate through springs, and the upper mold plate is also provided with an upper air-top flow channel connected to the upper air-top blocks.

[0010] In the above-mentioned thin-walled deep-cavity plastic trash can injection molding mold with an air-top demolding mechanism, the top plate ejection assembly includes an ejection plate with a rectangular ring cross-section and arranged at the bottom of the molding groove, and a top plate is also provided on the lower side of the lower mold plate. A plurality of straight ejector rods connected to the ejection plate are fixedly connected to the top plate.

[0011] In the above-mentioned thin-walled deep-cavity plastic trash can injection molding mold with an air ejection demoulding mechanism, an outer edge molding structure is also provided at the connection between the ejection plate and the middle template.

[0012] In the above-mentioned thin-walled deep-cavity plastic trash can injection molding mold with an air-top demolding mechanism, the outer edge molding structure includes an outer edge molding groove which is recessed inwardly and arranged on the top of the ejection plate and has a rectangular ring cross-section, and the bottom of the intermediate template is protruding with an outer edge molding protrusion which is inserted into the outer edge molding groove.

[0013] In the above-mentioned thin-walled deep-cavity plastic trash can injection molding mold with an air-cap demoulding mechanism, a plurality of reinforcing rib plate molding grooves are circumferentially arranged on the outer edge molding protrusion, and the reinforcing rib plate molding grooves pass through the outer edge molding protrusion on both sides.

[0014] In the above-mentioned injection molding mold for a thin-walled deep-cavity plastic trash can with an air-cap demolding mechanism, two lower cover plate connecting groove molding blocks are also provided on one side of the outer edge molding groove, and two upper cover plate connecting groove molding blocks corresponding to the lower cover plate connecting groove molding blocks are provided on the outer edge molding protrusion, and the upper cover plate connecting groove molding blocks and the upper cover plate connecting groove molding blocks are also provided with an arc-shaped groove body that can form a connecting shaft molding groove, and the two ends of the arc-shaped groove body are penetrated; the bottom of the outer edge molding groove on one side away from the lower cover plate connecting groove molding block is recessed inwardly to provide a cardboard molding groove, and the side wall of the outer edge molding groove on the side away from the lower cover plate connecting groove molding block is protrudingly provided with an opening cover groove molding block, and the outer edge molding protrusion is provided with an opening cover groove molding groove corresponding to the opening cover groove molding block.

[0015] In the above-mentioned thin-walled deep-cavity plastic trash can injection molding mold with an air-cap demolding mechanism, the lower cover plate connecting groove molding block is provided with an inwardly recessed positioning groove on the side away from the molding cavity, and the upper cover plate connecting groove molding block is provided with a positioning block that can be inserted into the positioning groove on the side away from the molding cavity.

[0016] Compared with the existing technology, the advantages of the utility model are:

[0017] 1. The molding cavity formed by the upper template, the middle cavity, the middle insert and the lower template can be injection molded into a thin-walled trash can. The non-destructive ejection mechanism arranged on the lower template can simultaneously apply thrust to the bottom and the opening side of the thin-walled trash can, so that the trash can can be subjected to more uniform force during ejection, thereby preventing the trash can from being damaged during ejection.

[0018] 2. The air-top demoulding structure and the top plate ejection assembly can apply thrust to the bottom and the opening side of the thin-walled trash can when the trash can is ejected, so that the trash can is subjected to more uniform force when it is ejected, thereby preventing the trash can from being damaged when it is ejected.

[0019] 3. When the product is ejected, the lower air top block can be pushed upward by introducing high-pressure gas into the lower air top flow channel, so that the bottom of the trash can can be thrusted by the lower air top block. After the introduction of high-pressure gas into the lower air top flow channel is stopped, the lower air top block can be moved downward and reset under the action of the spring. The upper air top block can be pushed downward by introducing high-pressure gas into the upper air top flow channel, so that the bottom of the trash can can be thrusted by the upper air top block, so that the trash can and the upper template can be separated when the mold is opened. After the introduction of high-pressure gas into the upper air top flow channel is stopped, the upper air top block can be moved upward and reset under the action of the spring.

[0020] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the external structure of the utility model;

[0022] Figure 2 It is a cross-sectional view of the utility model;

[0023] Figure 3 It is a structural diagram of the lower template;

[0024] Figure 4 It is a schematic diagram of the structure of the top plate ejection assembly;

[0025] Figure 5 It is a structural diagram of the intermediate template.

[0026] In the figure, an upper template 1, an intermediate template 2, a lower template 3, a molding groove 4, an intermediate cavity 5, an intermediate insert 6, a molding cavity 7, a gas top demolding structure 8, a top plate ejection assembly 9, a lower gas top block 10, a lower gas top flow channel 11, an upper gas top block 12, an upper gas top flow channel 13, an ejection plate 14, a top plate 15, a straight ejector rod 16, an outer edge molding groove 17, an outer edge molding protrusion 18, a reinforcing rib plate molding groove 19, a lower cover plate connecting groove molding block 20, an upper cover plate connecting groove molding block 21, a connecting shaft molding groove 22, a card plate molding groove 23, an opening cover groove molding block 24, an opening cover groove molding groove 25, a positioning groove 26, and a positioning block 27. DETAILED DESCRIPTION

[0027] like Figure 1-Figure 5 As shown, a thin-walled deep-cavity plastic trash can injection molding mold with an air-top demoulding mechanism includes an upper template 1, an intermediate template 2 and a lower template 3. The lower template 3 is provided with an inwardly recessed molding groove 4, the bottom of the intermediate template 2 is inserted into the molding groove 4, and an intermediate cavity 5 is vertically penetrated in the intermediate template 2. The lower template 3 is also provided with an intermediate insert 6 inserted into the intermediate cavity 5. The upper template 1, the intermediate cavity 5, the intermediate insert 6 and the lower template 3 are combined to form a molding cavity 7 with an opening facing downward, and the lower template 3 is provided with a non-destructive ejection mechanism.

[0028] In the utility model, the molding cavity 7 formed by the upper template 1, the middle cavity 5, the middle insert 6 and the lower template 3 can be injection molded to form a thin-walled trash can. The damage-free ejection mechanism arranged on the lower template 3 can simultaneously apply thrust to the bottom and the opening side of the thin-walled trash can, so that the trash can can be subjected to more uniform force during ejection, thereby preventing the trash can from being damaged during ejection.

[0029] Specifically, the damage-free ejection mechanism includes an air ejection demoulding structure 8 and an ejection assembly 9. The air ejection demoulding structure 8 and the ejection assembly 9 can respectively apply thrust to the bottom and the opening side of the thin-walled trash can when the trash can is ejected, so that the trash can is subjected to more uniform force when ejected, so as to prevent the trash can from being damaged when ejected.

[0030] Specifically, the gas ejection structure 8 includes two lower gas ejection blocks 10 arranged on the top of the middle insert 6, the lower gas ejection blocks 10 are connected to the middle insert 6 through springs, and the middle insert 6 is also provided with a lower gas ejection channel 11 connected to the bottom of the lower gas ejection block 10. When the product is ejected, the lower gas ejection block can be ejected upward by introducing high-pressure gas into the lower gas ejection channel, so that the lower gas ejection block can apply thrust to the bottom of the trash can, and after the introduction of high-pressure gas into the lower gas ejection channel is stopped, the lower gas ejection block can move downward and reset under the action of the spring.

[0031] Preferably, the gas ejection structure 8 includes two upper gas ejection blocks 12 arranged at the bottom of the upper template 1, the upper gas ejection blocks 12 are connected to the upper template 1 through a spring, and the upper template 1 is also provided with an upper gas ejection channel 13 connected to the upper gas ejection blocks 12. The upper gas ejection blocks can be pushed downward by introducing high-pressure gas into the upper gas ejection channel 13, so that the upper gas ejection blocks can apply thrust to the bottom of the trash can to separate the trash can and the upper template when the mold is opened, and the upper gas ejection blocks can move upward and reset under the action of the spring after the introduction of high-pressure gas into the upper gas ejection channel is stopped.

[0032] Specifically, the top plate ejection assembly 9 includes an ejection plate 14 with a rectangular ring cross section and arranged at the bottom of the molding groove 4. A top plate 15 is also provided at the lower side of the lower mold plate 3. A plurality of straight ejector rods 16 connected to the ejection plate 14 are fixedly connected to the top plate 15. When the top plate moves upward, the straight ejector rods can drive the ejection plate to move vertically upward, thereby applying a thrust to the bottom of the opening side of the trash can.

[0033] Preferably, an outer edge molding structure is further provided at the connection between the ejector plate 14 and the middle template 2, and the outer edge molding structure includes an outer edge molding groove 17 which is inwardly recessed and arranged at the top of the ejector plate 14 and has a rectangular ring-shaped cross section, and an outer edge molding protrusion 18 which is inserted into the outer edge molding groove 17 is protruded from the bottom of the middle template 2. The outer edge molding groove 17 on the ejector plate 14 and the outer edge molding protrusion 18 on the middle template 2 cooperate to form an outer edge of the trash can that is bent outward on the opening side of the trash can when the trash can product is injected.

[0034] Specifically, a plurality of reinforcing rib plate forming grooves 19 are also provided along the circumferential direction on the outer edge forming protrusion 18, and the two sides of the reinforcing rib plate forming grooves 19 penetrate the outer edge forming protrusion 18. The plurality of reinforcing rib plate forming grooves 19 can form a plurality of reinforcing rib plates between the outer edge of the trash can and the trash can body during the injection molding of the trash can product.

[0035] Preferably, two lower cover plate connecting groove forming blocks 20 are further provided on one side of the outer edge forming groove 17, and two upper cover plate connecting groove forming blocks 21 corresponding to the lower cover plate connecting groove forming blocks 20 are provided on the outer edge forming protrusion 18, and the upper cover plate connecting groove forming blocks 21 and the upper cover plate connecting groove forming blocks 21 are also provided with an arc-shaped groove body that can form a connecting shaft forming groove 22, and the two ends of the arc-shaped groove body are penetrated; the bottom of the outer edge forming groove 17 away from the lower cover plate connecting groove forming block 20 is recessed inwardly and provided with a cardboard forming groove 23, and the side wall of the outer edge forming groove 17 away from the lower cover plate connecting groove forming block 20 is protrudingly provided with an opening cover groove forming block 24, and the outer edge forming protrusion 18 is provided with an opening cover groove forming groove 25 corresponding to the opening cover groove forming block 24. The upper cover plate connecting groove forming block 21 and the lower cover plate connecting groove forming block 20 can cooperate to form a connecting groove for connecting the trash can cover on the opening side of the trash can, the upper cover plate connecting groove forming block 21 and the two arc-shaped groove bodies on the upper cover plate connecting groove forming block 21 that can be combined to form a connecting shaft forming groove 22 can cooperate to form a connecting shaft in the connecting groove, the opening cover groove forming groove 25 on the outer edge forming protrusion 18 cooperates with the opening cover groove forming block 24 in the outer edge forming groove 17 to form an opening cover groove on the side of the trash can away from the connecting groove, and the card plate forming groove 23 on the outer edge forming groove 17 cooperates with the outer edge forming protrusion 18 to form a card plate that can cooperate with the buckle on the trash can cover.

[0036] Preferably, the lower cover plate connection groove forming block 20 is provided with an inwardly recessed positioning groove 26 on the side away from the forming cavity 7, and the upper cover plate connection groove forming block 21 is provided with a positioning block 27 that can be inserted into the positioning groove 26 on the side away from the forming cavity 7. The positioning groove 26 cooperates with the positioning block 27 to position the intermediate template and the ejection plate.

[0037] The working principle of the utility model is as follows: the molding cavity 7 formed by the upper template 1, the middle cavity 5, the middle insert 6 and the lower template 3 can be injection molded to form a thin-walled trash can, and the non-damaging ejection mechanism arranged on the lower template 3 can simultaneously apply thrust to the bottom and the opening side of the thin-walled trash can, so that the trash can is subjected to more uniform force during ejection, so as to prevent the trash can from being damaged during ejection;

[0038] The gas-top demoulding structure 8 and the top plate ejection assembly 9 can respectively apply thrust to the bottom of the thin-walled garbage can and the open side of the thin-walled garbage can when the garbage can is ejected, so that the garbage can is subjected to more uniform force during ejection to prevent the garbage can from being damaged during ejection. When the product is ejected, the lower gas top block can be pushed upward by introducing high-pressure gas into the lower gas top flow channel, so that thrust can be applied to the bottom of the garbage can through the lower gas top block. After the introduction of high-pressure gas into the lower gas top flow channel is stopped, the lower gas top block can be moved downward and reset under the action of the spring. The upper gas top block can be pushed downward by introducing high-pressure gas into the upper gas top flow channel 13, so that thrust can be applied to the bottom of the garbage can through the upper gas top block, so that the mold can separate the garbage can and the upper template when the mold is opened. After the introduction of high-pressure gas into the upper gas top flow channel is stopped, the upper gas top block can be moved upward and reset under the action of the spring. When the top plate moves upward, the straight ejector rod can drive the ejection plate to move vertically upward, so as to apply thrust to the bottom of the opening side of the garbage can.

[0039] The outer edge forming groove 17 on the ejection plate 14 and the outer edge forming protrusion 18 on the middle template 2 can cooperate to form an outer edge of the trash can that is bent outward on the opening side of the trash can when the trash can product is injected. The plurality of reinforcing rib plate forming grooves 19 can form a plurality of reinforcing rib plates between the outer edge of the trash can and the trash can body when the trash can product is injected. The upper cover plate connecting groove forming block 21 and the lower cover plate connecting groove forming block 20 can cooperate to form a connecting groove for connecting the trash can cover plate on the opening side of the trash can. The upper cover plate connecting groove forming block 21 and the upper cover plate connecting groove forming block 20 are connected to the upper cover plate. The two arc-shaped groove bodies on the groove forming block 21 that can be combined to form the connecting shaft forming groove 22 can cooperate to form a connecting shaft in the connecting groove. The cover opening groove forming groove 25 on the outer edge forming protrusion 18 cooperates with the cover opening groove forming block 24 in the outer edge forming groove 17 to form a cover opening groove on the side of the trash can away from the connecting groove. The card plate forming groove 23 on the outer edge forming groove 17 cooperates with the outer edge forming protrusion 18 to form a card plate that can be buckled on the trash can cover. The positioning groove 26 cooperates with the positioning block 27 to position the intermediate template and the ejection plate.

[0040] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0041] Although this article uses the upper template 1, middle template 2, lower template 3, molding groove 4, middle cavity 5, middle insert 6, molding cavity 7, gas top demolding structure 8, top plate ejection assembly 9, lower gas top block 10, lower gas top flow channel 11, upper gas top block 12, upper gas top flow channel 13, ejection plate 14, top plate 15, straight ejector 16, outer edge molding groove 17, outer edge molding protrusion 18, reinforcing rib plate molding groove 19, lower cover plate connecting groove molding block 20, upper cover plate connecting groove molding block 21, connecting shaft molding groove 22, cardboard molding groove 23, cover opening groove molding block 24, cover opening groove molding groove 25, positioning groove 26, positioning block 27, etc. more frequently, these terms are used only to more conveniently describe and explain the essence of the utility model; interpreting them as any additional restrictions is contrary to the spirit of the utility model.

Claims

1. A thin-walled deep-cavity plastic trash can injection molding mold with an air-cap demoulding mechanism, comprising an upper mold plate (1), a middle mold plate (2) and a lower mold plate (3), characterized in that: The lower template (3) is provided with an inwardly recessed forming groove (4), the bottom of the middle template (2) is inserted into the forming groove (4), an intermediate cavity (5) is vertically penetrated in the middle template (2), and the lower template (3) is also provided with an intermediate insert (6) inserted into the intermediate cavity (5). The upper template (1), the intermediate cavity (5), the intermediate insert (6) and the lower template (3) are combined to form a forming cavity (7) with an opening facing downward, and the lower template (3) is provided with a non-destructive ejection mechanism.

2. The thin-walled deep-cavity plastic trash can injection molding mold with an air-cap demoulding mechanism according to claim 1, characterized in that: The non-destructive ejection mechanism comprises an air ejection demoulding structure (8) and a top plate ejection assembly (9).

3. The thin-walled deep-cavity plastic trash can injection molding mold with an air-cap demoulding mechanism according to claim 2, characterized in that: The gas cap demoulding structure (8) comprises two lower gas cap blocks (10) arranged on the top of the middle insert (6); the lower gas cap blocks (10) are connected to the middle insert (6) via springs; and the middle insert (6) is also provided with a lower gas cap flow channel (11) connected to the bottom of the lower gas cap blocks (10).

4. The thin-walled deep-cavity plastic trash can injection molding mold with an air-cap demoulding mechanism according to claim 3 is characterized in that: The gas-top demoulding structure (8) comprises two upper gas-top blocks (12) arranged at the bottom of the upper mold plate (1); the upper gas-top blocks (12) are connected to the upper mold plate (1) via springs; and the upper mold plate (1) is also provided with an upper gas-top flow channel (13) connected to the upper gas-top blocks (12).

5. The thin-walled deep-cavity plastic trash can injection molding mold with an air-cap demoulding mechanism according to claim 4, characterized in that: The ejector plate assembly (9) comprises an ejector plate (14) having a rectangular ring-shaped cross section and arranged at the bottom of the molding groove (4); a ejector plate (15) is also arranged on the lower side of the lower mold plate (3); and a plurality of straight ejector rods (16) connected to the ejector plate (14) are fixedly connected to the ejector plate (15).

6. The thin-walled deep-cavity plastic trash can injection molding mold with an air-cap demoulding mechanism according to claim 5, characterized in that: The connection between the ejection plate (14) and the middle template (2) is also provided with an outer edge forming structure.

7. The thin-walled deep-cavity plastic trash can injection molding mold with an air-cap demoulding mechanism according to claim 6, characterized in that: The outer edge forming structure comprises an outer edge forming groove (17) which is recessed inwardly and arranged on the top of the ejection plate (14) and has a rectangular ring-shaped cross section, and an outer edge forming protrusion (18) which is protruded from the bottom of the intermediate template (2) and is inserted into the outer edge forming groove (17).

8. The thin-walled deep-cavity plastic trash can injection molding mold with an air-cap demoulding mechanism according to claim 7, characterized in that: A plurality of reinforcing rib plate forming grooves (19) are also arranged on the outer edge forming protrusion (18) along the circumferential direction, and the reinforcing rib plate forming grooves (19) penetrate the outer edge forming protrusion (18) on both sides.

9. The thin-walled deep-cavity plastic trash can injection molding mold with an air-cap demoulding mechanism according to claim 8, characterized in that: Two lower cover plate connection groove forming blocks (20) are also provided on one side of the outer edge forming groove (17); two upper cover plate connection groove forming blocks (21) corresponding to the lower cover plate connection groove forming blocks (20) are provided on the outer edge forming protrusion (18); the upper cover plate connection groove forming blocks (21) and the upper cover plate connection groove forming blocks (21) are also provided with an arc-shaped groove body capable of forming a connecting shaft forming groove (22); the arc-shaped groove body is provided with two ends through; the bottom of the outer edge forming groove (17) away from the lower cover plate connection groove forming block (20) is inwardly recessed and provided with a cardboard forming groove (23); the side wall of the outer edge forming groove (17) away from the lower cover plate connection groove forming block (20) is protrudingly provided with an opening cover groove forming block (24); the outer edge forming protrusion (18) is provided with an opening cover groove forming groove (25) corresponding to the opening cover groove forming block (24).

10. The thin-walled deep-cavity plastic trash can injection molding mold with an air-cap demoulding mechanism according to claim 9, characterized in that: The lower cover plate connection groove forming block (20) is provided with an inwardly recessed positioning groove (26) on the side away from the forming cavity (7), and the upper cover plate connection groove forming block (21) is provided with a positioning block (27) capable of being inserted into the positioning groove (26) on the side away from the forming cavity (7).

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