Anti-warping injection mold for household plastic trash can

Abstract

The utility model provides an anti-warping injection mold for a household plastic trash can, which belongs to the field of mold technology. It includes an upper template, an intermediate template and a lower template. The lower template is provided with a molding insert inserted into the intermediate template. A molding cavity is provided between the upper template, the intermediate template, the molding insert and the lower template. The molding insert is provided with a vertical reinforcing rib molding structure. The lower template is also provided with an integral ejection mechanism. After the product is injection molded, the integral ejection mechanism can apply a uniform thrust to each position of the bottom of the trash can product so as to prevent the trash can from warping and deforming during ejection. The vertical reinforcing rib molding structure can form vertical reinforcing ribs at the bottom of the inner wall of the trash can to further prevent the trash can from warping and deforming. The internal and external synchronous cooling mechanism can cool the trash can product from both the inside and outside to improve the cooling efficiency of the trash can product.

Description

Technical Field

[0001] The utility model belongs to the technical field of molds and relates to an anti-warping injection mold for a household plastic trash can. Background Art

[0002] Household plastic trash cans are generally made by injection molding. After the plastic trash can is injection molded, if the force at each position is uneven during ejection, it is easy to cause the trash can to warp and deform.

[0003] For example, a Chinese patent discloses a plastic trash can mold [application number: 201520859589.0], which includes a movable mold plate, a fixed mold plate, an upper composite plate, a lower composite plate, a cavity core block, and a core-pulling cylinder installed on the outer walls of both sides of the movable mold plate, the piston rod of the core-pulling cylinder is connected with a core-pulling core, the core-pulling core passes through the movable mold plate and cooperates with the connecting hole in the movable mold plate, the cylinder body of the core-pulling cylinder is fixedly connected to the outer wall of the movable mold plate, and the movable mold plate is provided with a core-pulling hole for the piston rod and the core-pulling core to reciprocate; the core-pulling hole is divided into a core-pulling section and a piston section, the aperture of the piston section is larger than the aperture of the core-pulling section, and a supporting slider is provided at the connection between the core-pulling core and the piston rod, the supporting slider is coaxially arranged with the core-pulling core and the piston rod and cooperates with the hole wall of the piston section, and the supporting slider abuts against the end face of the core-pulling section and forms a sealing surface. Utility Model Content

[0004] The utility model aims to solve the above problems and provides an anti-warping injection mold for a household plastic trash can.

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

[0006] A warping-proof injection mold for a household plastic trash can comprises an upper mold plate, a middle mold plate and a lower mold plate. The lower mold plate is provided with a molding insert inserted into the middle mold plate. A molding cavity is provided between the upper mold plate, the middle mold plate, the molding insert and the lower mold plate. A vertical reinforcing rib molding structure is provided on the molding insert. The lower mold plate is also provided with an integral ejection mechanism. The molding insert and the middle mold plate are also provided with internal and external synchronous cooling mechanisms, respectively.

[0007] In the above-mentioned anti-warping injection mold for household plastic trash can, the vertical reinforcing rib forming structure includes four reinforcing rib forming grooves respectively arranged on the upper part of the forming insert, and the reinforcing rib forming grooves are arranged at the corners of the forming insert.

[0008] In the above-mentioned anti-warping injection mold for household plastic trash can, the bottom of the upper mold plate is also provided with four support plate forming grooves distributed in a rectangular array and having an arc-shaped cross section.

[0009] In the above-mentioned anti-warping injection mold for household plastic trash can, the integral ejection mechanism includes a lifting plate arranged at the bottom of the molding groove in the lower mold plate, the top surface of the lifting plate and the bottom of the molding cavity are against each other, and a lifting plate limiting structure is also provided in the molding groove.

[0010] In the above-mentioned anti-warping injection mold for household plastic trash can, the lifting plate limiting structure includes four vertically arranged limiting rods, and the limiting rods vertically penetrate the lifting plate and slide with the lifting plate.

[0011] In the above-mentioned anti-warping injection mold for household plastic trash can, the two ends of the lifting plate are protruding with a push rod mounting part with a semicircular cross-section, the bottom of the push rod mounting part is fixedly connected to a push rod, and the inner wall of the molding groove is also provided with a limiting sliding groove that slides with the push rod mounting part.

[0012] In the above-mentioned anti-warping injection mold for household plastic trash can, the internal and external synchronous cooling mechanism includes a plurality of internal cooling channels vertically arranged in the molding insert, and the lower mold plate is provided with internal inlet and outlet liquid channels connected to the internal cooling channels.

[0013] In the above-mentioned anti-warping injection mold for household plastic trash can, the internal and external synchronous cooling mechanism also includes a plurality of external cooling channels arranged along the circumference of the molding cavity, and the top of the intermediate template is also recessed inwardly and provided with connecting channels connecting a plurality of external cooling channels, and external inlet and outlet liquid channels connected to the external cooling channels are also provided on both sides of the intermediate template.

[0014] In the above-mentioned anti-warping injection mold for household plastic trash can, the upper mold plate and the middle mold plate are fixed by a plurality of bolts.

[0015] In the above-mentioned anti-warping injection mold for household plastic trash can, the molding insert and the lower mold plate are detachably connected by a plurality of bolts.

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

[0017] 1. After the product is injection molded, the overall ejection mechanism can apply uniform thrust to each position of the bottom of the trash can product to prevent the trash can from warping and deformation during ejection. The vertical reinforcement rib forming structure can form vertical reinforcement ribs at the bottom of the inner wall of the trash can to further prevent the trash can from warping and deformation. The internal and external synchronous cooling mechanism can cool the trash can product from both the inside and outside to improve the cooling efficiency of the trash can product.

[0018] 2. The four reinforcing rib forming grooves can form vertical reinforcing ribs at the bottom of the inner wall of the trash can during the injection molding of the trash can to prevent the trash can from warping and deformation. The four support plate forming grooves can form four support plates at the bottom of the trash can during the injection molding of the trash can product.

[0019] 3. The upward movement of the lifting plate can exert a vertical upward thrust on the bottom of the trash can product, thereby ejecting the trash can product from the lower template. Since the top of the lifting plate and the trash can product are in full contact, each position of the bottom will be subjected to equal force when the product is ejected, thereby preventing the trash can product from warping and deformation due to uneven force.

[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 cross-sectional view of the utility model;

[0022] Figure 2 It is a partial structural schematic diagram of the utility model;

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

[0024] Figure 4 It is a structural schematic diagram of the upper template;

[0025] Figure 5 It is a structural diagram of the overall ejection mechanism.

[0026] In the figure, an upper template 1, a middle template 2, a lower template 3, a molding insert 4, a molding cavity 5, a vertical reinforcement rib molding structure 6, an integral ejection mechanism 7, a reinforcement rib molding groove 8, a support plate molding groove 9, a lifting plate 10, a limiting rod 11, a ejector rod mounting portion 12, a ejector rod 13, a limiting slide groove 14, an internal and external synchronous cooling mechanism 15, an internal cooling channel 16, an internal inlet and outlet liquid channel 17, an external cooling channel 18, a connecting channel 19, and an external inlet and outlet liquid channel 20. DETAILED DESCRIPTION

[0027] like Figure 1-Figure 5 As shown, a warping-proof injection mold for a household plastic trash can comprises an upper template 1, an intermediate template 2 and a lower template 3, the lower template 3 is provided with a molding insert 4 inserted into the intermediate template 2, a molding cavity 5 is provided between the upper template 1, the intermediate template 2, the molding insert 4 and the lower template 3, a vertical reinforcement rib molding structure 6 is provided on the molding insert 4, the lower template 3 is also provided with an integral ejection mechanism 7, and the molding insert 4 and the intermediate template 2 are also provided with internal and external synchronous cooling mechanisms 15, respectively.

[0028] In the utility model, after the product is injection molded, the overall ejection mechanism can apply a uniform thrust to each position of the bottom of the trash can product to prevent the trash can from warping and deforming during ejection. The vertical reinforcement rib forming structure can form vertical reinforcement ribs at the bottom of the inner wall of the trash can to further prevent the trash can from warping and deforming. The internal and external synchronous cooling mechanism 15 can cool the trash can product from both the inside and outside to improve the cooling efficiency of the trash can product.

[0029] Specifically, the vertical reinforcement rib forming structure 6 includes four reinforcement rib forming grooves 8 respectively arranged on the upper part of the forming insert 4, and the reinforcement rib forming grooves 8 are arranged at the corners of the forming insert 4. The four reinforcement rib forming grooves 8 can form vertical reinforcement ribs at the bottom of the inner wall of the trash can during injection molding to prevent the trash can from warping and deformation.

[0030] Specifically, four support plate forming grooves 9 distributed in a rectangular array and having an arc-shaped cross section are also provided at the bottom of the upper mold plate 1. The four support plate forming grooves 9 can form four support plates at the bottom of the trash can when the trash can product is injected.

[0031] Specifically, the integral ejection mechanism 7 includes a lifting plate 10 disposed at the bottom of the molding groove in the lower mold plate 3, the top surface of the lifting plate 10 abuts against the bottom of the molding cavity 5, and a lifting plate limiting structure is also provided in the molding groove. The lifting plate moves upward to exert a vertical upward thrust on the bottom of the trash can product, thereby ejecting the trash can product from the lower mold plate. Since the top of the lifting plate is in full contact with the trash can product, each position of the bottom will be subjected to an equal force when the product is ejected, thereby preventing the trash can product from warping and deformation due to uneven force.

[0032] Preferably, the lifting plate limiting structure includes four vertically arranged limiting rods 11, which vertically penetrate the lifting plate 10 and slide with the lifting plate 10. The four limiting rods can limit the lifting plate when the lifting plate moves upward to prevent the force applied to the product from being offset due to the tilt of the lifting plate.

[0033] Specifically, the two ends of the jacking plate 10 are protruding with a jacking rod mounting part 12 with a semicircular cross section, and a jacking rod 13 is fixedly connected to the bottom of the jacking rod mounting part 12. The inner wall of the molding groove is also provided with a limiting slide groove 14 that slides with the jacking rod mounting part 12. The limiting slide groove cooperates with the jacking rod mounting part to limit the jacking plate, and the jacking rod is externally connected to a driving mechanism, which can drive the jacking plate to rise and fall in the vertical direction through the jacking rod.

[0034] Specifically, the internal and external synchronous cooling mechanism 15 includes a plurality of internal cooling channels 16 vertically arranged in the molding insert 4, the lower mold plate 3 is provided with an internal inlet and outlet liquid channel 17 connected to the internal cooling channel 16, the internal and external synchronous cooling mechanism 15 also includes a plurality of external cooling channels 18 arranged circumferentially along the molding cavity 5, the top of the intermediate mold plate 2 is also provided with a connecting channel 19 connected to the plurality of external cooling channels 18, and the two sides of the intermediate mold plate 2 are also provided with external inlet and outlet liquid channels 20 connected to the external cooling channels 18. Injecting coolant into the internal cooling channels in the molding insert and the external cooling channels in the intermediate mold plate can cool the product in the molding cavity from both the inside and outside of the product, thereby improving the cooling efficiency of the product.

[0035] Specifically, the upper template 1 and the middle template 2 are fixed by a plurality of bolts, and the forming insert 4 and the lower template 3 are detachably connected by a plurality of bolts to facilitate disassembly.

[0036] The working principle of the utility model is as follows: after the product is injection molded, the overall ejection mechanism can apply a uniform thrust to each position of the bottom of the trash can product so as to prevent the trash can from warping and deformation during ejection; the vertical reinforcement rib forming structure can form vertical reinforcement ribs at the bottom of the inner wall of the trash can to further prevent the trash can from warping and deformation; the internal and external synchronous cooling mechanism 15 can cool the trash can product from both the inside and outside to improve the cooling efficiency of the trash can product;

[0037] The four reinforcing rib forming grooves 8 can form vertical reinforcing ribs at the bottom of the inner wall of the trash can during injection molding to prevent the trash can from warping and deformation. The four supporting plate forming grooves 9 can form four supporting plates at the bottom of the trash can during injection molding of the trash can product.

[0038] The upward movement of the lifting plate can exert a vertical upward thrust on the bottom of the trash can product, so that the trash can product can be ejected from the lower template. Since the top of the lifting plate and the trash can product are in full contact, each position of the bottom will be subjected to an equal force when the product is ejected, so as to prevent the trash can product from warping and deformation due to uneven force. The four limit rods can limit the lifting plate when the lifting plate moves upward to prevent the force exerted on the product from being offset due to the tilt of the lifting plate. The limit slide groove cooperates with the ejector rod mounting part to limit the lifting plate. The ejector rod is externally connected to a driving mechanism, and the driving mechanism can drive the lifting plate to rise and fall in the vertical direction through the ejector rod.

[0039] Injecting coolant into the inner cooling channel in the molding insert and the outer cooling channel in the middle mold plate can cool the product in the molding cavity from both the inside and outside of the product, thereby improving the cooling efficiency of the product.

[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, the middle template 2, the lower template 3, the molding insert 4, the molding cavity 5, the vertical reinforcement rib molding structure 6, the integral ejection mechanism 7, the reinforcement rib molding groove 8, the support plate molding groove 9, the lifting plate 10, the limit rod 11, the ejector mounting portion 12, the ejector 13, the limit slide groove 14, the internal and external synchronous cooling mechanism 15, the internal cooling channel 16, the internal inlet and outlet liquid channel 17, the external cooling channel 18, the connecting channel 19, the external inlet and outlet liquid channel 20, 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 warping-proof injection mold for a household plastic trash can, comprising an upper mold plate (1), a middle mold plate (2) and a lower mold plate (3), wherein the lower mold plate (3) is provided with a molding insert (4) inserted into the middle mold plate (2), characterized in that: A molding cavity (5) is provided between the upper mold plate (1), the middle mold plate (2), the molding insert (4) and the lower mold plate (3); a vertical reinforcing rib molding structure (6) is provided on the molding insert (4); an integral ejection mechanism (7) is also provided on the lower mold plate (3); and internal and external synchronous cooling mechanisms (15) are also provided on the molding insert (4) and the middle mold plate (2), respectively.

2. The anti-warping injection mold for household plastic trash can according to claim 1, characterized in that: The vertical reinforcing rib forming structure (6) comprises four reinforcing rib forming grooves (8) respectively arranged on the upper part of the forming insert (4), and the reinforcing rib forming grooves (8) are arranged at the corners of the forming insert (4).

3. The anti-warping injection mold for household plastic trash can according to claim 2, characterized in that: The bottom of the upper mold plate (1) is also provided with four support plate forming grooves (9) distributed in a rectangular array and having an arc-shaped cross section.

4. The anti-warping injection mold for household plastic trash can according to claim 2, characterized in that: The integral ejection mechanism (7) comprises a lifting plate (10) arranged at the bottom of the molding groove in the lower mold plate (3), the top surface of the lifting plate (10) abuts against the bottom of the molding cavity (5), and a lifting plate limiting structure is also provided in the molding groove.

5. The anti-warping injection mold for household plastic trash can according to claim 4, characterized in that: The lifting plate limiting structure comprises four vertically arranged limiting rods (11), wherein the limiting rods (11) vertically penetrate the lifting plate (10) and are slidably matched with the lifting plate (10).

6. The anti-warping injection mold for household plastic trash can according to claim 5, characterized in that: The two ends of the jacking plate (10) are protrudingly provided with a push rod mounting portion (12) with a semicircular cross section, the bottom of the push rod mounting portion (12) is fixedly connected with a push rod (13), and the inner wall of the forming groove is also provided with a limiting sliding groove (14) that slidably cooperates with the push rod mounting portion (12).

7. The anti-warping injection mold for household plastic trash can according to claim 6, characterized in that: The internal and external synchronous cooling mechanism (15) comprises a plurality of internal cooling channels (16) vertically arranged in the molding insert (4), and the lower mold plate (3) is provided with internal inlet and outlet liquid channels (17) connected to the internal cooling channels (16).

8. The anti-warping injection mold for household plastic trash can according to claim 7, characterized in that: The internal and external synchronous cooling mechanism (15) further comprises a plurality of external cooling channels (18) arranged along the circumference of the molding cavity (5); the top of the intermediate template (2) is also recessed inwardly and provided with a connecting channel (19) connecting the plurality of external cooling channels (18); and both sides of the intermediate template (2) are also provided with external inlet and outlet liquid channels (20) connected to the external cooling channels (18).

9. The anti-warping injection mold for household plastic trash can according to claim 8, characterized in that: The upper template (1) and the middle template (2) are fixed by a plurality of bolts.

10. The anti-warping injection mold for household plastic trash can according to claim 9, characterized in that: The forming insert (4) and the lower template (3) are detachably connected via a plurality of bolts.

Images