Refrigerator door panel frame structure and injection mold thereof

Abstract

The application relates to a refrigerator door plate frame structure and an injection mold thereof. The refrigerator door plate frame structure is used for mounting a door plate and comprises a door frame body formed by an upper top frame, a side frame and a lower bottom frame formed by plastic injection. The side frame is provided with at least one limiting part on the inner side wall parallel to the length direction. The limiting part comprises a clamping strip arranged along the width direction of the side frame. The end of the clamping strip close to the center of the side frame is provided with a clamping hook for limiting the door plate. The top surface of the clamping hook close to the upper top frame is a flat surface. The application has the effects of improving the finished product quality and assembly efficiency of the door plate frame.

Description

Technical Field

[0001] This application relates to the field of refrigerator accessories, and in particular to a refrigerator door panel frame structure and its injection mold. Background Technology

[0002] In modern family life, refrigerators are a common household appliance that can provide a low-temperature storage environment. The refrigerator door is a component that ensures the realization of its low-temperature storage function. The refrigerator door mainly consists of two major components: the door panel and the door frame. The door panel is mainly used to realize the function of closing and covering the door, while the door frame is used to support the door panel and connect the door to the refrigerator body.

[0003] In the actual production process of refrigerator doors, the door frame is usually first injection molded. During the injection molding process, the inner sidewall of the door frame is formed with a boss column installation structure. After the door frame is produced, workers use screws and other connectors to fix the door frame to the door panel, and finally assemble it into a complete refrigerator door.

[0004] However, because a boss column structure needs to be formed during the injection molding process, the injection molded parts are prone to shrinkage during the cooling and solidification stage, resulting in air bubbles on the product surface and increasing the defect rate of door frame products. On the other hand, in the subsequent assembly stage, workers need to use special tools such as screwdrivers to tighten the screws to fix the door panel to the door frame. This assembly method is cumbersome and results in low overall assembly efficiency. Therefore, the door panel frame structure with boss columns and the injection mold have problems with low finished door panel frame quality and low assembly efficiency, which are obvious shortcomings. Utility Model Content

[0005] In order to improve the finished product quality and assembly efficiency of the door panel frame, this application provides a refrigerator door panel frame structure and its injection mold.

[0006] The technical solution for the refrigerator door panel frame structure and its injection mold provided in this application is as follows: A refrigerator door panel frame structure for installing a door panel includes a door frame body formed by an upper top frame, a side frame, and a lower bottom frame, all formed by plastic injection molding. The side frame has at least one limiting part on its inner side wall parallel to its length direction. The limiting part includes a retaining strip arranged along the width direction of the side frame. The end of the retaining strip near the center of the side frame is provided with a retaining hook for limiting the door panel. The top surface of the retaining hook near the upper top frame is a flat surface.

[0007] By adopting the above technical solution, when assembling the door frame body and the door panel, it is only necessary to align the door panel with the door frame body, so that the edge of the door panel corresponds with the limiting part of the inner side wall of the side frame. Then, push the door panel so that the hook at the end of the latch strip engages with the latching part on the edge of the door panel. Since the top surface of the latch near the top frame is flat, the latch is stably attached to the latching part of the door panel, thereby completing the fixing of the door panel and the door frame body. Compared with the traditional door panel frame with boss column structure, the setting of the limiting part only requires the worker to align and push to achieve installation, without the need for tools to screw, which improves the assembly efficiency. In addition, the boss column structure that is prone to injection molding defects is eliminated, which improves the injection molding quality of the door frame body.

[0008] Optionally, the limiting part further includes an abutting block disposed opposite to the card strip, the abutting block being provided with an abutting surface, the abutting surface being disposed inclined from bottom to top in a direction close to the center of the side frame.

[0009] By adopting the above technical solution, after the edge of the door panel contacts the abutment surface, it will gradually slide into the space between the clip and the abutment block along the inclined abutment surface, thereby achieving the guiding effect of the door panel installation; after installation, the abutment block and the clip cooperate to clamp the door panel from both sides, reducing the possibility of the door panel loosening or shaking during use and improving the overall structural stability of the refrigerator door.

[0010] Optionally, the end face of the card strip near the bottom frame is provided with a reinforcing rib, and the end of the reinforcing rib away from the card strip is provided on the inner side wall of the side frame.

[0011] By adopting the above technical solution, the reinforcing rib can enhance the connection strength between the locking strip and the inner wall of the side frame, avoid problems such as breakage and deformation of the locking strip due to long-term stress or external impact, and extend the service life of the limiting part.

[0012] Optionally, a positioning key is provided on the inner wall of the side frame parallel to the length direction. The positioning key has a cross-shaped cross section and is used to position the door panel.

[0013] By adopting the above technical solution, when assembling the door frame body and the door panel, workers can first determine the relative position of the limiting part and the door panel through the positioning key, align and embed the corresponding positioning groove and cross-shaped positioning key on the door panel, so that the door panel always moves along the preset trajectory during the pushing process, ensuring that the edge of the door panel can accurately correspond to the locking strip and hook of the limiting part. This simplifies the alignment steps of the door panel and the limiting part, reduces the adjustment time during assembly, and further improves the assembly efficiency.

[0014] An injection mold for manufacturing the aforementioned refrigerator door frame structure includes a first molding block slidably disposed on a moving mold. The first molding block abuts against the inner sidewall of the side frame. An installation groove is provided on the first molding block. A second molding block is slidably connected inside the installation groove. A first molding cavity for molding the abutment block is provided on the upper top surface of the second molding block. The lower bottom surface and the first molding block enclose a second molding cavity for molding the retaining strip and the retaining hook.

[0015] By adopting the above technical solution, in the injection molding production process of the door frame body, the first molding block and the second molding block cooperate with each other, and the abutment block on the side frame is formed by the first molding cavity on the top surface of the second molding block. At the same time, the second molding cavity, which is surrounded by the bottom surface of the second molding block and the top surface of the first molding block, forms the retaining strip and the retaining hook, thus obtaining the door frame body with the limiting part.

[0016] Optionally, it also includes a core-pulling assembly, which includes a core-pulling inclined post disposed on a fixed mold. The core-pulling inclined post is inclined from bottom to top along the direction close to the side frame. A core-pulling block is slidably disposed in the mounting groove. The core-pulling block has a core-pulling groove for the core-pulling inclined post to pass through. The first molding block has a waist-shaped groove that slidably engages with the core-pulling inclined post. A connecting inclined block is disposed on the end face of the core-pulling block near the second molding block. The second molding block has a connecting groove that slidably engages with the connecting inclined block.

[0017] By adopting the above technical solution, during demolding, the fixed mold drives the core-pulling inclined column to move upward. When the core-pulling inclined column moves, it pulls the core-pulling block to move away from the side frame. With the sliding cooperation of the connecting inclined block and the connecting groove, the movement of the core-pulling block will pull the second forming block to move in the direction of the core-pulling block, so that the second forming block gradually separates from the forming abutment block and the limiting part. When the core-pulling inclined column moves to abut against the inner side wall of the waist-shaped groove, the core-pulling inclined column will drive the first forming block to slide away from the side frame as a whole. In this way, the door frame body is separated from the mold. The setting of the core-pulling component realizes the step-by-step core pulling of the second forming block and the first forming block, so that the abutment block and the limiting part structure can smoothly separate from the mold, reducing the product deformation or damage caused by the concentration of force during demolding.

[0018] Optionally, a limiting groove is formed on the inner sidewall of the mounting groove, and a protrusion that mates with the limiting groove is integrally formed on the second molding block.

[0019] By adopting the above technical solution, when the core-pulling inclined column pushes the first molding block away from the side frame, the inner sidewall of the limiting groove restricts the movement direction of the second molding block by limiting the protrusion, ensuring that the second molding block moves along the limiting groove toward the side closer to the first molding block.

[0020] Optionally, the first molding block is provided with a guide strip, and the second molding block is provided with a guide groove that slides with the guide strip.

[0021] By adopting the above technical solution, the sliding cooperation between the guide strip and the guide groove ensures that the first molding block and the second molding block move along the preset straight path, preventing the first molding block and the second molding block from deviating or getting stuck during sliding, avoiding errors in the molding cavity size due to positional deviation, thereby ensuring the molding size accuracy of the abutment block and the limiting part.

[0022] In summary, this application includes at least one of the following beneficial technical effects: 1. This application provides a limiting part on the inner side wall of the side frame. When assembling the door frame body and the door panel, the door panel only needs to be aligned with the door frame body so that the edge of the door panel corresponds to the limiting part on the inner side wall of the side frame. Then, the door panel is pushed so that the hook at the end of the clip engages with the engagement part on the edge of the door panel. Since the top surface of the hook near the top frame is flat, the hook is stably attached to the engagement part of the door panel, thereby completing the fixation of the door panel and the door frame body. Compared with the traditional door panel frame with boss column structure, the setting of the limiting part only requires the worker to align and push to achieve installation, without the need for tools to screw, which improves the assembly efficiency. In addition, the boss column structure that is prone to injection molding defects is eliminated, which improves the injection molding quality of the door frame body. 2. This application sets a first molding block and a second molding block in the injection mold. During the injection molding production of the door frame body, the first molding block and the second molding block cooperate with each other. The first molding cavity on the top surface of the second molding block forms the abutment block on the side frame. At the same time, the second molding cavity, which is surrounded by the bottom surface of the second molding block and the top surface of the first molding block, forms the retaining strip and the retaining hook. Thus, a door frame body with a limiting part is obtained. 3. By setting up a core-pulling assembly, this application realizes the step-by-step core pulling of the second molding block and the first molding block, so that the abutment block and the limiting part structure can be smoothly separated from the mold, reducing product deformation or damage caused by force concentration during demolding. Attached Figure Description

[0023] Figure 1 This is a structural schematic diagram of the refrigerator door panel frame according to Embodiment 1 of this application.

[0024] Figure 2 This is a cross-sectional view of the side frame in Embodiment 1 of this application.

[0025] Figure 3 yes Figure 2 Enlarged view of point A in the middle.

[0026] Figure 4 This is a schematic diagram of the structure of the first molding block, the second molding block, and the core-pulling block in Embodiment 2 of this application.

[0027] Figure 5 A cross-sectional view of the second molding block in Embodiment 2 of this application.

[0028] Figure 6 Cross-sectional view of the first molding block and the core-pulling block in Embodiment 2 of this application.

[0029] Explanation of reference numerals in the attached drawings: 1. Top frame; 2. Side frame; 21. Positioning key; 3. Bottom frame; 4. Limiting part; 41. Locking strip; 411. Reinforcing rib; 42. Abutting block; 421. Abutting surface; 43. Hook; 5. First forming block; 51. Mounting groove; 511. Limiting groove; 52. Guide strip; 53. Waist-shaped groove; 6. Second forming block; 61. First forming cavity; 62. Second forming cavity; 63. Protrusion; 64. Guide groove; 65. Connecting groove; 7. Core-pulling assembly; 71. Core-pulling inclined column; 72. Core-pulling block; 721. Core-pulling groove; 722. Connecting inclined block. Detailed Implementation

[0030] The following is in conjunction with the appendix Figure 1-6 This application will be described in further detail.

[0031] Example 1 This application discloses a refrigerator door panel frame structure.

[0032] Reference Figure 1 and Figure 2 A refrigerator door frame structure includes a door frame body formed by an upper top frame 1, a side frame 2, and a lower bottom frame 3, all formed by plastic injection molding. The upper top frame 1 and the lower bottom frame 3 are located on opposite sides of the side frame 2 in the thickness direction. The inner side wall of the side frame 2, parallel to the length direction, is provided with at least one limiting part 4. In this embodiment, there are two limiting parts 4 on each side, and the two limiting parts 4 are located on opposite sides of the length direction of the side frame 2.

[0033] Reference Figure 1 and Figure 2 Each limiting part 4 includes a retaining strip 41 and an abutting block 42 arranged opposite to each other in the thickness direction of the side frame 2. The abutting block 42 is integrally formed on the upper top frame 1. The center lines of the retaining strip 41 and the abutting block 42 are aligned. The retaining strip 41 and the abutting block 42 are integrally formed on the inner side wall of the side frame 2 by injection molding. An abutting surface 421 is provided on the abutting inclined block. The abutting surface 421 is inclined from bottom to top in the direction close to the center of the side frame 2.

[0034] Reference Figure 2 and Figure 3The end of the clip 41 extending to the center of the side frame 2 is integrally formed with a hook 43. The top surface of the hook 43 near the top frame 1 is a flat surface. In this embodiment, the limiting part 4 cooperates with the snap-fit ​​part on the door panel. The snap-fit ​​part on the door panel can be a hook groove or a hook block that hooks and cooperates with the hook 43. The specific assembly principle is the existing technology in the assembly field and will not be described in detail in this embodiment.

[0035] Reference Figure 2 and Figure 3 The inner wall of the side frame 2, parallel to the length direction, is integrally formed with a positioning key 21. The cross-section of the positioning key 21 is cross-shaped. The positioning key 21 is inserted into the positioning groove on the door panel. When the positioning key 21 is inserted into the positioning groove, the limiting part 4 is aligned with the snap-fit ​​part on the door panel.

[0036] When assembling the door frame body and the door panel, the worker aligns the positioning groove on the door panel with the positioning key 21 and inserts it. Then, the worker pushes the door panel, and after the edge of the door panel contacts the abutment surface 421, it will gradually slide into the space between the clip 41 and the abutment block 42 along the inclined abutment surface 421. At this time, the hook 43 at the end of the clip 41 engages with the engagement part on the edge of the door panel. Since the top surface of the hook 43 near the top frame 1 is flat, the hook is stably attached to the engagement part of the door panel, thereby completing the fixation of the door panel and the door frame body. Compared with the traditional door panel frame with boss column structure, the setting of the limiting part 4 only requires the worker to align and push to achieve installation, without the need for tools to screw, which improves the assembly efficiency. In addition, the boss column structure that is prone to injection molding defects is eliminated, which improves the injection molding quality of the door frame body.

[0037] Reference Figure 2 and Figure 3 Each locking strip 41 has a reinforcing rib 411 connected to the end face near the bottom frame 3. The end of the reinforcing rib 411 away from the locking strip 41 is connected to the inner side wall of the side frame 2. The reinforcing rib 411 enhances the connection strength between the locking strip 41 and the inner side wall of the side frame 2, preventing the locking strip 41 from breaking or deforming due to long-term stress or external impact, and extending the service life of the limiting part 4.

[0038] The implementation principle of a refrigerator door panel frame structure in this application embodiment is as follows: When assembling the door frame body and the door panel, the worker aligns the positioning groove on the door panel with the positioning key 21 and inserts it. Then, the worker pushes the door panel. After the edge of the door panel contacts the abutment surface 421, it will gradually slide into the space between the clip 41 and the abutment block 42 along the inclined abutment surface 421. At this time, the hook 43 at the end of the clip 41 engages with the engagement part on the edge of the door panel. Since the top surface of the hook 43 near the top frame 1 is flat, the hook is stably attached to the engagement part of the door panel, thereby completing the fixation of the door panel and the door frame body. Compared with the traditional door panel frame with boss column structure, the setting of the limiting part 4 only requires the worker to align and push to achieve installation. There is no need to use tools to screw, which improves the assembly efficiency. In addition, the boss column structure that is prone to injection molding defects is eliminated, which improves the injection molding quality of the door frame body.

[0039] Example 2 Reference Figure 4 Example 2 discloses an injection mold for manufacturing the refrigerator door frame structure as described above. The injection mold includes a fixed mold (not shown in the figure) and a moving mold (not shown in the figure). The specific driving principles and composition of the fixed mold and the moving mold are existing technologies in the field of injection molding, and will not be repeated in the embodiments of this application.

[0040] Reference Figure 4 and Figure 5 In order to form the limiting part 4 described in embodiment 1, a first molding block 5 is slidably connected on the moving mold. The first molding block 5 abuts against the inner side wall of the side frame 2. An installation groove 51 is provided on the first molding block 5. A second molding block 6 is slidably connected inside the installation groove 51. A first molding cavity 61 for forming the abutment block 42 is provided on the upper top surface of the second molding block 6. The lower bottom surface and the first molding block 5 surround to form a second molding cavity 62 for forming the hook 43 and the strip 41.

[0041] Reference Figure 4 and Figure 5 A limiting groove 511 is formed on the inner side wall of the mounting groove 51 along the moving direction of the second molding block 6. A protrusion 63 that mates with the limiting groove 511 is integrally formed on the second molding block 6. A guide strip 52 is fixedly connected to the surface of the first molding block 5 near the second molding block 6. A guide groove 64 that slidably engages with the guide strip 52 is formed on the second molding block 6. Both the guide strip 52 and the guide groove 64 are perpendicular to the length direction of the side frame 2. The sliding engagement between the guide strip 52 and the guide groove 64 ensures that the first molding block 5 and the second molding block 6 move along a preset straight path, ensuring the accuracy of the forming dimensions of the abutment block 42 and the limiting part 4.

[0042] Reference Figure 4 , Figure 5 and Figure 6The moving mold and the fixed mold are provided with a core-pulling assembly 7. The core-pulling assembly 7 includes a core-pulling inclined column 71 fixedly connected to the fixed mold. The core-pulling inclined column 71 is inclined from bottom to top along the direction close to the side frame 2. A core-pulling block 72 is slidably connected inside the mounting groove 51. The core-pulling block 72 has a core-pulling groove 721 for the core-pulling inclined column 71 to pass through. The inner side wall of the core-pulling groove 721 is in contact with the outer surface of the core-pulling inclined column 71. When the core-pulling inclined column 71 moves in the vertical direction, it will push the core-pulling block 72 to slide along the mounting groove 51.

[0043] Reference Figure 4 , Figure 5 and Figure 6 The first molding block 5 has a waist-shaped groove 53 that slides with the core-pulling inclined post 71. The cross-section of the waist-shaped groove 53 is larger than that of the core-pulling inclined post 71. The core-pulling block 72 has a connecting inclined block 722 integrally formed on the end face near the second molding block 6. The second molding block 6 has a connecting groove 65 that slides with the connecting inclined block 722. The cross-sectional area of ​​the connecting groove 65 and the connecting inclined block 722 are both T-shaped, so that as the second molding block 6 moves with the core-pulling block 72, the connecting inclined block 722 and the connecting groove 65 tilt towards the core-pulling inclined post 71 along the direction close to the side frame 2.

[0044] The implementation principle of Example 2 is as follows: When the mold is closed, the fixed mold drives the core-pulling inclined column 71 vertically downward. The core-pulling inclined column 71 generates a pushing force on the inner wall of the core-pulling groove 721, pushing the core-pulling block 72 to slide in the direction toward the side frame 2. During the sliding process of the core-pulling block 72, the second molding block 6 is pushed to move toward the direction close to the guide strip 52 through the sliding cooperation between the connecting inclined block 722 and the connecting groove 65. At this time, the guide groove 64 and the guide strip 52 gradually align and engage. As the core-pulling inclined column 71 moves down to abut against the inner wall of the waist-shaped groove 53 near the side frame 2, the pushing force of the core-pulling inclined column 71 is transmitted to the first molding block 5, causing the first molding block 5 to slide in the direction toward the side frame 2 as a whole. Finally, the first molding cavity 61 and the second molding cavity 62 on the top surface of the second molding block 6 are completely closed, preparing for the injection filling of the limiting part 4. After injection molding, the fixed mold drives the core-pulling inclined column 71 to move vertically upward. The core-pulling inclined column 71 pulls the core-pulling block 72 to slide away from the side frame 2 through the core-pulling groove 721. When the core-pulling block 72 moves, it pulls the second molding block 6 away from the guide groove 64 along the length of the side frame 2, so that the second molding block 6 separates from the molded abutment block 42 and the limiting part 4, completing the first step of core pulling. When the core-pulling inclined column 71 continues to move upward until it abuts against the inner wall of the waist groove 53 away from the side frame 2, the pulling force of the core-pulling inclined column 71 drives the first molding block 5 to slide away from the side frame 2 as a whole. At this time, the first molding block 5 is completely separated from the inner wall of the side frame 2, completing the second step of core pulling. In this way, the door frame body is separated from the mold.

[0045] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A refrigerator door panel frame structure for installing a door panel, characterized in that, The door frame body is formed by a top frame (1), a side frame (2) and a bottom frame (3) formed by plastic injection molding. The side frame (2) has at least one limiting part (4) on its inner sidewall parallel to the length direction. The limiting part (4) includes a retaining strip (41) arranged along the width direction of the side frame (2). The end of the retaining strip (41) near the center of the side frame (2) is provided with a retaining hook (43) for limiting the door panel. The top surface of the hook (43) near the top frame (1) is a flat surface.

2. The refrigerator door panel frame structure according to claim 1, characterized in that, The limiting part (4) also includes an abutting block (42) disposed opposite to the card strip (41). The abutting block (42) is provided with an abutting surface (421), which is inclined from bottom to top in a direction close to the center of the side frame (2).

3. The refrigerator door panel frame structure according to claim 1, characterized in that, The end face of the card strip (41) near the bottom frame (3) is provided with a reinforcing rib (411), and the end of the reinforcing rib (411) away from the card strip (41) is provided on the inner side wall of the side frame (2).

4. The refrigerator door panel frame structure according to claim 1, characterized in that, The side frame (2) has a positioning key (21) on its inner sidewall parallel to the length direction. The positioning key (21) has a cross-shaped cross section and is used to position the door panel.

5. An injection mold for manufacturing a refrigerator door panel frame structure as described in any one of claims 1-4, characterized in that, The first molding block (5) is slidably disposed on the moving mold. The first molding block (5) abuts against the inner side wall of the side frame (2). The first molding block (5) has an installation groove (51). A second molding block (6) is slidably connected inside the installation groove (51). The upper top surface of the second molding block (6) has a first molding cavity (61) for molding the abutment block (42). The lower bottom surface and the first molding block (5) enclose the second molding cavity (62) for molding the card strip (41) and the card hook (43).

6. The injection mold according to claim 5, characterized in that, It also includes a core-pulling assembly (7), which includes a core-pulling inclined post (71) disposed on a fixed mold. The core-pulling inclined post (71) is inclined from bottom to top along the direction close to the side frame (2). A core-pulling block (72) is slidably disposed in the mounting groove (51). A core-pulling groove (721) is provided on the core-pulling block (72) for the core-pulling inclined post (71) to pass through. A waist-shaped groove (53) is provided on the first molding block (5) to slide with the core-pulling inclined post (71). A connecting inclined block (722) is provided on the end face of the core-pulling block (72) near the second molding block (6). A connecting groove (65) is provided on the second molding block (6) to slide with the connecting inclined block (722).

7. An injection mold according to claim 6, characterized in that, The inner sidewall of the mounting groove (51) is provided with a limiting groove (511) along the moving direction of the second molding block (6), and the second molding block (6) is integrally formed with a protrusion (63) that cooperates with the limiting groove (511).

8. An injection mold according to claim 6, characterized in that, The first molding block (5) is provided with a guide strip (52), and the second molding block (6) is provided with a guide groove (64) that slides with the guide strip (52).

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