Buckle injection mold structure
By introducing a synchronous water-stopping and downward injection mechanism into the snap-fit injection mold, the problem of cooling water affecting the molding of molten plastic was solved, and a high yield rate of snap-fit injection molding was achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 上海毅弋自动化科技有限公司
- Filing Date
- 2025-05-29
- Publication Date
- 2026-04-24
AI Technical Summary
In the existing snap-fit injection mold, the continuous cooling of the cooling water circuit during the injection of molten plastic causes the molten plastic to fail to completely fill the cavity, affecting the yield of snap-fit molding.
A snap-fit injection mold structure was designed, which includes a synchronous water-stopping mechanism and a downward injection mechanism. The opening and closing of the cooling water channel is controlled by a limit baffle to prevent the molten plastic from cooling down and hardening before filling the cavity. The heating cylinder is used to heat the molten plastic to ensure that the cavity is filled.
It improves the yield rate of snap-fit injection molding, prevents molten plastic from hardening before filling the cavity, ensures normal filling of molten plastic, and improves the yield rate.
Smart Images
Figure CN224158775U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of injection mold structure technology, specifically a snap-fit injection mold structure. Background Technology
[0002] Snap-fit is a common mechanical connection structure that enables the quick engagement and disengagement of parts through elastic deformation. It is widely used in electronic products, home appliances, automobiles, daily necessities and other fields. The structure of snap-fit injection mold is a special mold designed to form plastic parts with snap-fit features. Molten plastic is injected into the mold cavity and solidified into a part with a snap-fit structure. Special mechanisms (such as sliders and angled ejectors) are used to handle the undercut or cantilever structure of the snap-fit to ensure smooth demolding.
[0003] In existing technology, the interior of the mold cavity is usually equipped with cooling water channels. These channels uniformly cool the mold, allowing the injection-molded snap-fit to be demolded normally. However, in actual use, because the water inside the cooling water channels is circulating, it continuously cools the mold. During the injection of molten plastic, the molten plastic entering the mold cavity is prone to cooling down before filling the cavity, causing the molten plastic to harden and fail to fill the cavity properly, thus affecting the yield of the finished snap-fit. Therefore, it is necessary to improve the snap-fit injection mold structure to solve the above problems. Utility Model Content
[0004] The purpose of this utility model is to provide a snap-fit injection mold structure to solve the problems mentioned in the background art.
[0005] To achieve the above objectives, this utility model provides the following technical solution: a snap-fit injection mold structure, including a left mold shell and a right mold cover, wherein a drain pipe is fixedly installed on the front of the left mold shell, both the left mold shell and the right mold cover have cavities inside, both the left mold shell and the right mold cover have injection ports fixedly installed on their tops, the left mold shell has cooling water channels inside, a synchronous water stopping mechanism is provided on the front of the left mold shell, and a downward injection mechanism is provided on the top of the left mold shell.
[0006] Preferably, the synchronous water stop mechanism includes a water inlet, which is fixedly installed on the front of the left mold shell. A fixing block is fixedly installed on the front of the water inlet. A slotted cover is rotatably installed on the front of the fixing block. A limit baffle is movably installed inside the slotted cover. A residual tooth ring is fixedly installed on the outside of the slotted cover. A fixing pipe is fixedly installed on the front of the slotted cover. A rotating sealing sleeve is rotatably installed on the outside of the fixing pipe. A connecting water inlet pipe is fixedly installed inside the rotating sealing sleeve. A rack is engaged on the right side of the residual tooth ring. A connecting rod is fixedly installed on the top of the rack.
[0007] Preferably, the front of the limiting baffle is in movable contact with the inner side of the front of the slotted rotating cover, and the back of the limiting baffle is in movable contact with the front of the fixing block.
[0008] Preferably, the front and back of the limiting baffle are provided with limiting movable inserts, and the inside of the fixed groove block and the slotted rotating cover is provided with guide grooves, and the limiting movable inserts provided on the front and back of the limiting baffle are slidably installed inside the guide grooves opened inside the fixed groove block and the slotted rotating cover.
[0009] Preferably, the downward injection molding mechanism includes an electric push rod, which is fixedly installed on the top of the left mold shell. A fixing rod is fixedly installed on the top of the output end of the electric push rod. A heating cylinder is fixedly installed inside the fixing rod. A material conveying pipe is fixedly installed on the top of the heating cylinder. An injection discharge head is fixedly installed on the bottom of the heating cylinder.
[0010] Preferably, the connecting rod has a hole at the corresponding position of the injection molding discharge head, and the injection molding discharge head is fixedly installed inside the hole opened inside the connecting rod.
[0011] Preferably, the injection discharge head corresponds to the curvature inside the docking injection port, and the injection discharge head is slidably installed inside the docking injection port.
[0012] Compared with the prior art, this utility model provides a snap-fit injection mold structure, which has the following beneficial effects:
[0013] 1. This snap-fit injection mold structure, through its synchronized water-stopping mechanism, allows the toothed ring to rotate synchronously with the descending injection head during injection molding. This rotation, via a limiting baffle, prevents cooling water from entering the cooling water circuit. When the injection head rises, the limiting baffle opens simultaneously, automatically stopping the cooling cycle during molten plastic injection. This prevents hardening of the molten plastic before it fills the cavity, ensuring proper filling and improving the yield rate of snap-fit injection molding production.
[0014] 2. This snap-fit injection mold structure, through the set downward injection mechanism, uses an electric push rod to drive the injection discharge head to descend during use, allowing the injection discharge head to enter the interior of the docking injection port to fill the cavity with molten plastic. The set heating cylinder can reheat the molten plastic to prevent it from cooling down and solidifying during transportation. At the same time, the descent of the injection discharge head can drive the rack to descend and control the opening and closing of the limit baffle, realizing the function of synchronously controlling the cooling circulation water intake with the injection. Attached Figure Description
[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0016] Figure 1 This is a schematic diagram of the appearance and structure of the present utility model;
[0017] Figure 2 This is a cross-sectional view of the external structure of this utility model;
[0018] Figure 3 This is a schematic diagram of the external structure of the synchronous water shut-off mechanism of this utility model;
[0019] Figure 4 This is an exploded view of the external structure of the synchronous water shut-off mechanism of this utility model;
[0020] Figure 5 This is a schematic diagram of the external structure of the downward injection molding mechanism of this utility model.
[0021] In the diagram: 1. Left mold shell; 2. Synchronous water stopping mechanism; 21. Water inlet; 22. Fixed groove block; 23. Slotted rotating cover; 24. Limiting baffle; 25. Residual tooth ring; 26. Fixed pipe; 27. Rotating sealing sleeve; 28. Connecting water inlet pipe; 29. Rack; 210. Connecting rod; 3. Downward injection mechanism; 31. Electric push rod; 32. Fixed rod; 33. Heating cylinder; 34. Material conveying pipe; 35. Injection discharge head; 4. Right mold cover; 5. Connecting drain pipe; 6. Cavity; 7. Connecting injection port; 8. Cooling water circuit. Detailed Implementation
[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. 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.
[0023] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0024] Example:
[0025] Please see Figure 1-4 This utility model provides a technical solution: a snap-fit injection mold structure, including a left mold shell 1 and a right mold cover 4. A drain pipe 5 is fixedly installed on the front of the left mold shell 1. Cavities 6 are opened inside both the left mold shell 1 and the right mold cover 4. Injection ports 7 are fixedly installed on the top of both the left mold shell 1 and the right mold cover 4. Cooling water passages 8 are opened inside the left mold shell 1. A synchronous water stopping mechanism 2 is provided on the front of the left mold shell 1. A downward injection mechanism 3 is provided on the top of the left mold shell 1.
[0026] Furthermore, the synchronous water shut-off mechanism 2 includes a water inlet 21, which is fixedly installed on the front of the left mold shell 1. A fixing slot block 22 is fixedly installed on the front of the water inlet 21. A slotted rotating cover 23 is rotatably installed on the front of the fixing slot block 22. A limit baffle 24 is movably installed inside the slotted rotating cover 23. A residual tooth ring 25 is fixedly installed on the outside of the slotted rotating cover 23. A fixing pipe 26 is fixedly installed on the front of the slotted rotating cover 23. A rotating sealing sleeve 27 is rotatably installed on the outside of the fixing pipe 26. The inner part of the rotating sealing sleeve 27... The part is fixedly installed with a docking water inlet pipe 28, and a rack 29 is engaged on the right side of the residual tooth ring 25. A connecting rod 210 is fixedly installed on the top of the rack 29. Through the set synchronous water stopping mechanism 2, when the injection of molten plastic begins, that is, when the injection discharge head 35 descends into the docking injection port 7, the limiting baffle 24 can automatically close to block the center entrance of the fixed groove block 22, preventing the cooling water path 8 from continuing to cool down and avoiding the situation where the left mold shell 1 continuously cools down during injection.
[0027] Furthermore, the front of the limiting baffle 24 is in active contact with the inner side of the front of the slotted rotating cover 23, and the back of the limiting baffle 24 is in active contact with the front of the fixed slot block 22. By using the limiting baffle 24 to fit and contact the fixed slot block 22 and the slotted rotating cover 23, the water inlet at the center of the fixed slot block 22 can be blocked normally, so that the cooling water will not enter the interior of the cooling water passage 8.
[0028] Furthermore, the front and back of the limiting baffle 24 are provided with limiting movable inserts, and the inside of the fixed slot block 22 and the slotted rotating cover 23 are provided with guide grooves. The limiting movable inserts provided on the front and back of the limiting baffle 24 are slidably installed inside the guide grooves provided inside the fixed slot block 22 and the slotted rotating cover 23. Through the provided limiting movable inserts and guide grooves, the limiting baffle 24 can be moved when the slotted rotating cover 23 rotates, thereby freely switching between blocking and ending blocking.
[0029] Please see Figure 5 Furthermore, the downward injection molding mechanism 3 includes an electric push rod 31, which is fixedly installed on the top of the left mold shell 1. A fixing rod 32 is fixedly installed on the top of the output end of the electric push rod 31. A heating cylinder 33 is fixedly installed inside the fixing rod 32. A material conveying pipe 34 is fixedly installed on the top of the heating cylinder 33. An injection discharge head 35 is fixedly installed at the bottom of the heating cylinder 33. Through the downward injection molding mechanism 3, the injection discharge head 35 can be driven to descend to inject molten plastic, and at the same time, the rack 29 can be driven to move, thereby synchronously controlling the opening and closing of the limit baffle 24.
[0030] Furthermore, holes are provided at corresponding positions of the connecting rod 210 and the injection discharge head 35, and the injection discharge head 35 is fixedly installed inside the holes provided inside the connecting rod 210, so as to fix the connecting rod 210 and the injection discharge head 35 together, and so that the descending injection discharge head 35 can normally drive the connecting rod 210 to descend.
[0031] Furthermore, the injection discharge head 35 corresponds to the curvature inside the docking injection port 7, and the injection discharge head 35 is slidably installed inside the docking injection port 7. Through the injection discharge head 35 corresponding to the curvature inside the docking injection port 7, the injection discharge head 35 can normally contact the inner wall of the two docking injection ports 7 after being merged, so that injection can be performed normally.
[0032] In actual operation, when this device is in use, the external cooling water circulation device is connected to the cooling water circuit 8 through the docking drain pipe 5 and docking water inlet pipe 28. At this time, production can begin. During the injection molding production of the snap-fit, the left mold shell 1 and the right mold cover 4 are closed first. After the left mold shell 1 and the right mold cover 4 are closed, the two docking injection ports 7 are merged together. The electric push rod 31 is driven, which causes the fixing rod 32 to drive the heating cylinder 33 to descend. At this time, the injection discharge head 35 is inserted into the docking injection port 7. Inside the injection discharge head 35, when it descends, the connecting rod 210 drives the rack 29 to descend, causing the rack 29 to drive the slotted rotating cover 23 to rotate. When the slotted rotating cover 23 rotates, the limiting baffle 24 moves by using the guide rod and the guide groove to block the fixed slot block 22. At this time, the cooling water will not enter the interior of the cooling water circuit 8, and the injection cooling will stop. After the injection is completed, the injection discharge head 35 rises. At this time, the limiting baffle 24 opens, the block is released, and the cooling of the molten plastic begins.
[0033] It should be noted that when the injection discharge head 35 is not descending and is in the standard state, the limiting baffle 24 is in the open state. After the injection discharge head 35 descends, the limiting baffle 24 automatically closes and blocks the fixed groove block 22. The limiting baffle 24 in the blocked state is shown as the right mold cover 4 in the attached figure. At the same time, the pipes of the external cooling water circulation device connected to the docking drain pipe 5 and the docking water inlet pipe 28 are rigid structures, not ordinary flexible pipes. The docking water inlet pipe 28 connected to the rigid pipes enables the slotted rotating cover 23 to rotate normally.
[0034] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.
Claims
1. A snap-fit injection mold structure, comprising a left mold shell (1) and a right mold cover (4), characterized in that: A drain pipe (5) is fixedly installed on the front of the left mold shell (1). Cavities (6) are opened inside both the left mold shell (1) and the right mold cover (4). A docking injection port (7) is fixedly installed on the top of both the left mold shell (1) and the right mold cover (4). A cooling water channel (8) is opened inside the left mold shell (1). A synchronous water stopping mechanism (2) is provided on the front of the left mold shell (1). A downward injection mechanism (3) is provided on the top of the left mold shell (1).
2. The snap-fit injection mold structure according to claim 1, characterized in that: The synchronous water stop mechanism (2) includes a water inlet (21), which is fixedly installed on the front of the left mold shell (1). A fixed groove block (22) is fixedly installed on the front of the water inlet (21). A slotted cover (23) is rotatably installed on the front of the fixed groove block (22). A limit baffle (24) is movably installed inside the slotted cover (23). A residual tooth ring (25) is fixedly installed on the outside of the slotted cover (23). A fixed pipe (26) is fixedly installed on the front of the slotted cover (23). A rotating sealing sleeve (27) is rotatably installed on the outside of the fixed pipe (26). A docking water inlet pipe (28) is fixedly installed inside the rotating sealing sleeve (27). A rack (29) meshes with the right side of the residual tooth ring (25). A connecting rod (210) is fixedly installed on the top of the rack (29).
3. The snap-fit injection mold structure according to claim 2, characterized in that: The front of the limiting baffle (24) is in active contact with the inner side of the front of the slotted rotating cover (23), and the back of the limiting baffle (24) is in active contact with the front of the fixing block (22).
4. The snap-fit injection mold structure according to claim 2, characterized in that: The front and back of the limiting baffle (24) are provided with limiting movable insert rods, and the inside of the fixed groove block (22) and the slotted rotating cover (23) are provided with guide grooves. The limiting movable insert rods provided on the front and back of the limiting baffle (24) are slidably installed inside the guide grooves opened inside the fixed groove block (22) and the slotted rotating cover (23).
5. The snap-fit injection mold structure according to claim 2, characterized in that: The downward injection molding mechanism (3) includes an electric push rod (31), which is fixedly installed on the top of the left mold shell (1). A fixing rod (32) is fixedly installed on the top of the output end of the electric push rod (31). A heating cylinder (33) is fixedly installed inside the fixing rod (32). A material conveying pipe (34) is fixedly installed on the top of the heating cylinder (33). An injection discharge head (35) is fixedly installed on the bottom of the heating cylinder (33).
6. The snap-fit injection mold structure according to claim 5, characterized in that: The connecting rod (210) has holes at the corresponding positions of the injection discharge head (35), and the injection discharge head (35) is fixedly installed inside the holes opened inside the connecting rod (210).
7. The snap-fit injection mold structure according to claim 5, characterized in that: The injection discharge head (35) corresponds to the curvature inside the docking injection port (7), and the injection discharge head (35) is slidably installed inside the docking injection port (7).