Rapid demolding device of refrigerator drawer injection mold

Abstract

The utility model relates to the technical field of molds, in particular to a quick demolding device of a refrigerator drawer injection mold, which comprises a movable mold and a fixed mold opposite to the movable mold, a plurality of through holes communicated with the outside are arranged on the bottom wall of the fixed mold, inner guide sleeves are inserted and matched in the through holes, and the inner guide sleeves are detachably connected with the fixed mold. An air cylinder is arranged on one side of the fixed mold, a jacking plate is detachably installed at the tail end of a telescopic shaft of the air cylinder, a plurality of ejector pins are detachably installed on the upper surface of the jacking plate, the ejector pins penetrate through the inner guide sleeves and are in sliding connection with the inner guide sleeves, and ejection protruding columns are fixedly installed at the top ends of the ejector pins. The ejection protruding column is located in the inner guide sleeve and is in sliding connection with the inner guide sleeve, and the ejector pin and the ejection protruding column move towards the interior of the fixed mold to be used for ejecting the forming drawer in the fixed mold outwards to complete demolding operation. According to the utility model, quick demoulding operation is facilitated, and the inner guide sleeve and the ejector pin can be detached and replaced.

Description

Technical Field

[0001] This utility model relates to the field of mold technology, and more specifically, to a quick demolding device for refrigerator drawer injection molds. Background Technology

[0002] In the refrigerator manufacturing industry, refrigerator drawers are important storage components, and their production efficiency and quality directly affect the overall production and performance of refrigerators. Currently, refrigerator drawers are mostly produced using injection molding. When performing injection molding, corresponding injection molds are usually used. Injection molds are usually divided into moving molds and fixed molds. The fixed mold has a molding cavity. After the mold is closed, the plastic part completes the molding operation in the corresponding molding cavity.

[0003] The invention patent with authorization announcement number CN108189329A discloses an injection mold for a refrigerator drawer, including a fixed base plate and a movable top plate. Guide pillars are welded to the four corners of the fixed base plate, and the movable top plate is movably mounted on the four guide pillars. A lower mold is provided on the fixed base plate, and an injection cavity is provided in the middle of the lower mold. A first receiving groove is provided at the bottom center of the injection cavity, and a top extension plate is movably installed in the first receiving groove. A piston rod of a top extension cylinder is fixedly connected to the bottom of the top extension plate, and the top extension cylinder is fixedly installed on the bottom outer side of the fixed base plate. An upper mold is provided directly above the lower mold on the movable top plate, and an inner mold is provided near the lower mold on the upper mold. This invention has a novel design, simple structure, and convenient use. It can quickly demold the product and prevent the product from sticking to the mold, thus preventing deformation and cracking, and improving the injection molding efficiency.

[0004] While this technical solution offers advantages such as rapid product demolding, preventing product adhesion to the mold and thus deformation and cracking, and improving injection molding efficiency, most injection molds currently rely on ejector pins to push the plastic part out of the molding cavity for demolding. Since most ejector pins are non-removable, wear from prolonged displacement can easily lead to leakage. In such cases, the inability to remove the ejector pin necessitates replacing the entire mold, resulting in significant economic losses. Furthermore, some ejector pins, although replaceable, are directly slidingly connected to the mold, lacking replaceable and protective components at the connection point. Wear on the mold due to ejector pins can render the entire mold unusable. Therefore, we propose a rapid demolding device for refrigerator drawer injection molds. Utility Model Content

[0005] The purpose of this invention is to provide a quick demolding device for refrigerator drawer injection molds, so as to solve the defects mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A rapid demolding device for a refrigerator drawer injection mold includes a moving mold and a fixed mold opposite to the moving mold. The bottom wall of the fixed mold has multiple through holes communicating with the outside. An inner guide sleeve is inserted into each through hole and is detachably connected to the fixed mold. A cylinder is located on one side of the fixed mold. A lifting plate is detachably mounted at the end of the cylinder's telescopic shaft. Multiple ejector pins are detachably mounted on the upper surface of the lifting plate. The ejector pins pass through the inner guide sleeve and are slidably connected to it. An ejector protrusion is fixedly mounted at the top of each ejector pin. The ejector protrusion is located inside the inner guide sleeve and is slidably connected to it. The ejector pins and the ejector protrusion move towards the fixed mold to eject the molded drawer outwards, completing the demolding operation.

[0008] Preferably, the molded part has a molding chamber, the refrigerator drawer plastic part is formed in the molding chamber, and the top of the through hole is connected to the molding chamber.

[0009] Preferably, the inner guide sleeve is provided with a sliding hole, the ejector pin is located in the sliding hole and is slidably connected to the sliding hole, the top wall of the sliding hole is provided with a frustum-shaped cavity, and the ejector protrusion is located in the frustum-shaped cavity and is slidably connected to the frustum-shaped cavity;

[0010] This feature allows the ejector pin and ejector protrusion to slide normally within the inner guide sleeve.

[0011] Preferably, the size of the frustum-shaped chamber is adapted to the size of the ejector protrusion, and the ejector protrusion is a frustum-shaped chamber with an upper outer diameter larger than a lower outer diameter;

[0012] This feature increases the contact area between the top surface of the ejector pin and the refrigerator drawer plastic parts, making it easier to push the refrigerator drawer plastic parts outward.

[0013] Preferably, a fixing plate is fixedly installed at the bottom end of the inner guide sleeve, and the fixing plate is detachably installed on the bottom surface of the fixed mold by a plurality of fastening screws;

[0014] This feature facilitates the installation and removal of the inner guide sleeve.

[0015] Preferably, a rectangular plate is fixedly installed at the end of the telescopic shaft of the cylinder, and the lifting plate is detachably installed on the top surface of the rectangular plate by a plurality of fastening bolts.

[0016] Preferably, the size of the inner guide sleeve is adapted to the size of the through hole, and a fixing seat is fixedly installed at the bottom end of the ejector pin. The fixing seat is detachably installed on the upper surface of the lifting plate by a plurality of fastening screws.

[0017] This feature facilitates the installation and removal of the ejector pin.

[0018] Preferably, the cylinder is fixedly mounted on an external frame, a plurality of guide sleeves are fixedly mounted on the external frame, and a plurality of guide posts are fixedly mounted on the bottom surface of the lifting plate. The guide posts are located inside the guide sleeves and are slidably connected to the guide sleeves.

[0019] Compared with the prior art, the beneficial effects of this utility model are:

[0020] 1. This utility model, by setting a detachable inner guide sleeve, which is connected to the fixed mold by fastening screws, and the ejector pin slidingly engaging with the inner guide sleeve, allows for replacement of the detachable inner guide sleeve when the ejector pin and mold wear, without needing to replace the entire mold. This achieves the effect of reducing economic losses caused by ejector pin wear and extending the overall service life of the mold.

[0021] 2. This utility model achieves convenient disassembly and replacement of both the ejector pin and the lifting plate by using fastening screws to detachably install the fixing seat at the bottom of the ejector pin and the lifting plate, and by using fastening bolts to detachably install the rectangular plate at the end of the cylinder telescopic shaft and the lifting plate. This enables quick replacement of the ejector pin when it is worn or damaged, reducing maintenance time and improving production efficiency.

[0022] 3. This utility model, by setting a frustum-shaped cavity within the inner guide sleeve that matches the size of the ejector pin, and by ensuring the ejector pin is specifically frustum-shaped, increases the contact area between the ejector pin and the refrigerator drawer plastic part, making the ejection process smoother and more stable, and completing the rapid demolding operation. Simultaneously, the sliding fit between the lifting plate and the cylinder through the guide pin and guide sleeve ensures the stability and accuracy of the ejection action. This achieves the effect of improving the demolding quality of the refrigerator drawer and reducing product deformation and damage. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0024] Figure 2 This is one of the partial structural schematic diagrams of this utility model;

[0025] Figure 3 This is the second partial structural schematic diagram of the present utility model;

[0026] Figure 4 This is the third partial structural schematic diagram of this utility model;

[0027] Figure 5 This is a cross-sectional view of the inner guide sleeve of this utility model;

[0028] The meanings of the labels in the diagram are as follows:

[0029] 1. Moving mold; 10. Fixed mold; 11. Molding chamber; 12. Through hole; 13. Inner guide sleeve; 131. Frustum chamber; 132. Sliding hole; 14. Fixed plate;

[0030] 2. External frame; 20. Cylinder; 201. Rectangular plate; 21. Lifting plate; 22. Guide post; 23. Guide sleeve; 24. Ejector pin; 241. Fixed seat; 25. Ejector protrusion. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] Please see Figures 1-5 This utility model provides a technical solution: a quick demolding device for a refrigerator drawer injection mold, including a moving mold 1 and a fixed mold 10 opposite to the moving mold 1. The bottom wall of the fixed mold 10 is provided with multiple through holes 12 that communicate with the outside. An inner guide sleeve 13 is inserted into the through holes 12. The inner guide sleeve 13 is detachably connected to the fixed mold 10. A cylinder 20 is provided on one side of the fixed mold 10. A lifting plate 21 is detachably installed at the end of the telescopic shaft of the cylinder 20. Multiple ejector pins 24 are detachably installed on the upper surface of the lifting plate 21. The ejector pins 24 pass through the inner guide sleeve 13 and are slidably connected to the inner guide sleeve 13, so that the ejector pins 24 can be stably guided by the inner guide sleeve 13. When the inner guide sleeve 13 or the ejector pins 24 are worn, they can be disassembled and replaced individually, avoiding the need to replace the entire fixed mold 10 due to local wear, thus reducing maintenance costs. The moving mold 1 is installed on the corresponding drive shaft of the injection molding machine, enabling normal mold opening and closing operations.

[0033] In this embodiment, an ejector protrusion 25 is fixedly installed at the top of the ejector pin 24. The ejector protrusion 25 is located inside the inner guide sleeve 13 and is slidably connected to the inner guide sleeve 13. The ejector pin 24 and the ejector protrusion 25 move toward the fixed mold 10 to eject the molded drawer in the fixed mold 10 outward to complete the demolding operation. A molding chamber 11 is provided in the fixed mold 10. The refrigerator drawer plastic part is molded in the molding chamber 11. The top of the through hole 12 is connected to the molding chamber 11, so that the ejector pin 24 and the ejector protrusion 25 can extend into the molding chamber 11 from the inner guide sleeve 13 to realize the ejection of the refrigerator drawer plastic part in the molding chamber and ensure the smooth progress of the demolding process.

[0034] like Figure 5As shown, the inner guide sleeve 13 is provided with a sliding hole 132. The ejector pin 24 is located in the sliding hole 132 and is slidably connected to the sliding hole 132. A frustum cavity 131 is provided on the top wall of the sliding hole 132. The ejector protrusion 25 is located in the frustum cavity 131 and is slidably connected to the frustum cavity 131. The ejector protrusion 25 slides in the frustum cavity 131, which restricts the movement trajectory of the ejector pin 24 and the ejector protrusion 25, ensuring that they slide stably in a fixed direction and providing reliable guidance for smooth demolding.

[0035] Specifically, the dimensions of the frustum-shaped chamber 131 are matched with the dimensions of the ejector pin 25. The ejector pin 25 is a frustum-shaped chamber with an upper outer diameter larger than the lower outer diameter, which increases the contact area between the top surface of the ejector pin 25 and the refrigerator drawer plastic part. This allows for even force application during ejection, reducing deformation and damage caused by excessive local force on the plastic part, and making the demolding of the refrigerator drawer plastic part smoother.

[0036] Furthermore, a fixing plate 14 is fixedly installed at the bottom of the inner guide sleeve 13. The fixing plate 14 is detachably installed on the bottom surface of the fixed mold 10 by multiple fastening screws, making the disassembly and installation of the inner guide sleeve 13 and the fixed mold 10 more convenient, facilitating the quick replacement of the inner guide sleeve 13 when needed, and improving maintenance efficiency.

[0037] like Figure 4 As shown, a rectangular plate 201 is fixedly installed at the end of the telescopic shaft of the cylinder 20. The lifting plate 21 is detachably installed on the top surface of the rectangular plate 201 by multiple fastening bolts, so that the lifting plate 21 and the cylinder 20 are detachably connected, which facilitates the maintenance and replacement of the lifting plate 21, and at the same time ensures that the power of the cylinder 20 is stably transmitted to the lifting plate 21.

[0038] In addition, the size of the inner guide sleeve 13 is matched with the size of the through hole 12. The bottom end of the ejector pin 24 is fixedly installed with a fixing seat 241. The fixing seat 241 is detachably installed on the upper surface of the lifting plate 21 by multiple fastening screws, which makes the disassembly and installation of the ejector pin 24 easier. When the ejector pin 24 is worn or damaged, it can be quickly replaced to ensure production progress.

[0039] It is worth noting that the cylinder 20 is fixedly installed on the external frame 2, and multiple guide sleeves 23 are fixedly installed on the external frame 2. Multiple guide pillars 22 are fixedly installed on the bottom surface of the lifting plate 21. The guide pillars 22 are located inside the guide sleeves 23 and are slidably connected to the guide sleeves 23, providing guidance and support for the movement of the lifting plate 21. This ensures the stability and accuracy of the cylinder 20 driving the lifting plate 21 to push out the ejector pins 24, thereby improving the demolding quality.

[0040] Finally, it should be noted that the cylinder 20, the corresponding control system, and the external power supply involved in this utility model are all general standard parts or parts known to those skilled in the art. Their structure and principle can be known to those skilled in the art through technical manuals or conventional experimental methods. In the idle space of this device, all the above-mentioned electrical components, which refer to power elements, electrical components, and the matching controller and power supply, are connected by wires. The specific connection method should refer to the working principle in this utility model. The electrical connections between each electrical component are completed in the order of operation. The detailed connection methods are all technologies known in the art.

[0041] When using the quick demolding device for the refrigerator drawer injection mold of this utility model, firstly, when the mold is closed, the moving mold 1 and the fixed mold 10 are closed, and the refrigerator drawer plastic part is injection molded in the molding cavity 11 of the fixed mold 10. At this time, the ejector pin 24 and the ejector protrusion 25 at its top are located in the sliding hole 132 and the frustum cavity 131 of the inner guide sleeve 13, and are in the initial standby state.

[0042] After the plastic part cools down, the demolding process is started: the telescopic shaft of cylinder 20 drives the lifting plate 21 to move through the rectangular plate 201. The guide post 22 on the bottom surface of the lifting plate 21 slides along the guide sleeve 23 of the outer frame 2 to ensure smooth movement. The lifting plate 21 drives the ejector pin 24 to move upward. The fixed seat 241 at the bottom of the ejector pin 24 is connected to the lifting plate 21 by fastening screws to ensure stable power transmission.

[0043] The ejector pin 24 passes through the sliding hole 132 of the inner guide sleeve 13, and the ejector protrusion 25 at the top slides upward along the frustum cavity 131 and finally extends into the molding cavity 11. Since the ejector protrusion 25 is frustum shaped and fits the frustum cavity 131, its top surface has a large contact area with the plastic part, and it can apply force evenly to push the plastic part out of the molding cavity 11 to complete the demolding.

[0044] After demolding, the cylinder 20 retracts, causing the lifting plate 21 and ejector pin 24 to reset. If the ejector pin 24 or the inner guide sleeve 13 is worn, the ejector pin 24 and the inner guide sleeve 13 can be replaced by removing the fastening screws of the fixed seat 241 or the fastening screws of the fixed plate 14 without disassembling the entire fixed mold 10.

[0045] 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 preferred examples and are not intended to limit the 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. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A quick demoulding device for injection moulds of refrigerators' drawers, comprising a movable half (1) and a fixed half (10) opposite to the movable half (1), characterised in that it comprises: The bottom wall of the fixed mold (10) is provided with multiple through holes (12) communicating with the outside. An inner guide sleeve (13) is inserted into each through hole (12). The inner guide sleeve (13) is detachably connected to the fixed mold (10). A cylinder (20) is provided on one side of the fixed mold (10). A lifting plate (21) is detachably installed at the end of the telescopic shaft of the cylinder (20). Multiple ejector pins (24) are detachably installed on the upper surface of the lifting plate (21). The ejector pin (24) passes through the inner guide sleeve (13) and is slidably connected to the inner guide sleeve (13). An ejector protrusion (25) is fixedly installed at the top of the ejector pin (24). The ejector protrusion (25) is located inside the inner guide sleeve (13) and is slidably connected to the inner guide sleeve (13). The ejector pin (24) and the ejector protrusion (25) move toward the fixed mold (10) to eject the molding drawer inside the fixed mold (10) outward to complete the demolding operation.

2. The quick demolding device of the refrigerator drawer injection mold according to claim 1, characterized in that: The mold (10) is provided with a molding chamber (11), in which the refrigerator drawer plastic part is formed. The top of the through hole (12) is connected to the molding chamber (11).

3. The quick demolding device of the refrigerator drawer injection mold according to claim 1, characterized in that: The inner guide sleeve (13) is provided with a sliding hole (132), the ejector pin (24) is located in the sliding hole (132) and is slidably connected to the sliding hole (132), the top wall of the sliding hole (132) is provided with a frustum chamber (131), the ejector protrusion (25) is located in the frustum chamber (131) and is slidably connected to the frustum chamber (131).

4. The quick demolding device of the refrigerator drawer injection mold according to claim 3, characterized in that: The dimensions of the frustum chamber (131) are adapted to the dimensions of the ejector protrusion (25), and the ejector protrusion (25) is frustum shaped with an upper outer diameter larger than the lower outer diameter.

5. The quick demolding device of the refrigerator drawer injection mold according to claim 1, characterized in that: The bottom end of the inner guide sleeve (13) is fixedly installed with a fixing plate (14), which is detachably installed on the bottom surface of the fixed mold (10) by a plurality of fastening screws.

6. The quick demolding device of the refrigerator drawer injection mold according to claim 1, characterized in that: A rectangular plate (201) is fixedly installed at the end of the telescopic shaft of the cylinder (20), and the lifting plate (21) is detachably installed on the top surface of the rectangular plate (201) by a plurality of fastening bolts.

7. The quick demolding device of the refrigerator drawer injection mold according to claim 1, characterized in that: The size of the inner guide sleeve (13) is adapted to the size of the through hole (12). The bottom end of the ejector pin (24) is fixedly installed with a fixing seat (241). The fixing seat (241) is detachably installed on the upper surface of the lifting plate (21) by a plurality of fastening screws.

8. The quick demolding device of the refrigerator drawer injection mold according to claim 1, characterized in that: The cylinder (20) is fixedly installed on the external frame (2). Multiple guide sleeves (23) are fixedly installed on the external frame (2). Multiple guide posts (22) are fixedly installed on the bottom surface of the lifting plate (21). The guide posts (22) are located inside the guide sleeves (23) and are slidably connected to the guide sleeves (23).

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