A new type of die lever ejection exhaust head structure

Abstract

The present application relates to injection molding mold auxiliary mechanism technical field, specifically to a new type of fixed mold lever ejection exhaust material head structure, including: static die and movable die;Wherein, the static die is equipped with a sliding block and a lever linkage mechanism composed of lever, support block, reset rod and ejector rod, the support block is fixed in the static die, the middle part of the lever is hinged to the support block to form the lever fulcrum, one end of the lever is hinged to the reset rod, and the other end is hinged to the ejector rod, the static die is also provided with a spring for continuously applying outward elastic force to the reset rod. The present application sets up a delay separation gap between the bending rod and the sliding block, the material head is first separated from the movable die and retained in the static die when the mold is opened, then the sliding block presses down the reset rod to drive the ejector rod to automatically eject the material head, the material head is automatically separated without adding cylinder or oil cylinder in the narrow fixed mold space, and the problem that the traditional fixed mold cannot be built-in with ejector plate and needs manual or external power to remove the material head is solved.

Description

Technical Field

[0001] This invention relates to the field of auxiliary mechanisms for injection molding molds, specifically a novel fixed mold lever ejector venting head structure. Background Technology

[0002] In actual injection molding production, to eliminate defects such as trapped air, scorching, and weld lines at the end of the product, mold designers usually add a waste venting head at the end of the product. The principle is to use the waste venting head to guide the air, plastic decomposition gases, and the first stream of cold material out of the mold cavity, thereby ensuring the quality of the main body of the product.

[0003] However, these ejector heads are mostly located on the fixed mold side. But unlike the moving mold side, the fixed mold side cannot fit an ejector plate in the conventional fixed mold mounting plate. The space is completely filled by the fixed mold insert of the mold blank. In order to remove the ejector head, the current conventional practice is to manually or separately use a robotic clamp to cut off and grind the scrap head after injection molding. This not only wastes an extra process, but also causes the flatness of the product end to be out of tolerance if the manual cutting position is inaccurate. Some mold factories have tried to add pneumatic push rods or hydraulic cylinders to the outside of the fixed mold to eject the ejector head, but these solutions require additional connection to the air or oil circuit. The air and oil pipes are easy to get tangled and broken, and the hydraulic cylinder is also prone to oil leakage and contamination of the mold. Furthermore, the stroke and force of the external push rod are difficult to adjust. When the ejector head is stuck tightly, it cannot be pushed out, and when it is stuck loosely, it is easy to damage the edge of the cavity. It can be seen that, under the general trend of ensuring fully automated production, developing a compact and reliable fixed mold ejector head mechanism that does not require an external independent power source is a very urgent engineering requirement. To address this, we propose a novel fixed-mold lever ejection venting head structure. Summary of the Invention

[0004] The purpose of this invention is to provide a novel fixed mold lever ejector venting head structure, which has the advantages of being compact and reliable and requiring no external independent power source, thus solving the problem of the difficulty in automatically removing the fixed mold venting head.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a novel fixed mold lever ejector venting head structure, comprising: Static mold and moving mold; The stationary mold is equipped with a slider and a lever linkage mechanism consisting of a lever, a support block, a reset rod, and a push rod. The support block is fixed inside the stationary mold. The middle part of the lever is hinged to the support block to form a lever fulcrum. One end of the lever is hinged to the reset rod, and the other end is hinged to the push rod. The stationary mold is also equipped with a spring for continuously applying outward elastic force to the reset rod. The parting surface of the stationary mold is equipped with a venting head forming cavity that communicates with the product cavity. The moving mold is fixed with a bent tie rod, and the corresponding side walls of the bent tie rod and the slider are provided with mutually cooperating driving inclined surfaces. In the mold-closed state, the bent tie rod is inserted into the stationary mold and pushes the slider towards the cavity through the driving inclined surface. After the slider loses its constraint on the reset rod, the spring pushes the reset rod to move and drives the ejector rod to return to the position flush with the bottom surface of the cavity through the lever. In the open mold state, a delayed separation gap is reserved between the bent tie rod and the slider. When the moving mold opens the stroke corresponding to this gap, its slider remains stationary, while the venting head detaches from the moving mold parts and remains in the forming cavity of the stationary mold. After the moving mold continues to open past the delayed separation gap, the bent tie rod drives the slider to slide away from the cavity in the opposite direction through the driving inclined plane. Its slider presses down the reset rod, and the reset rod drives the ejector rod to push out towards the parting surface through the fulcrum of the lever, pushing out the venting head that is stuck in the stationary mold and causing it to fall off.

[0006] Preferably, a positioning groove is provided on one side of the slider, and a ball-head plunger is provided at a corresponding position on the stationary mold, with the steel ball of the ball-head plunger inserted into the positioning groove.

[0007] Preferably, the distance of the delayed separation gap is four to six millimeters.

[0008] Preferably, both ends and the middle of the lever are hinged to the top rod, the reset rod and the support block respectively by pins.

[0009] Preferably, a pad is fixed on one side of the stationary mold, and a countersunk hole corresponding to the position of the reset rod is opened on the pad. The spring is placed in the countersunk hole, and one end of the spring abuts against one end of the reset rod.

[0010] Preferably, the stationary mold has a left pressure bar and a right pressure bar on both sides of the slide groove. The left pressure bar and the right pressure bar are locked to the stationary mold by fasteners. The slider is confined within the guide groove formed by the left pressure bar and the right pressure bar and slides back and forth in a single direction.

[0011] Preferably, the bent tie rod is fixed to the side of the moving mold by a tie rod seat, the bottom of the bent tie rod is inserted into the groove of the tie rod seat and locked by connecting screws, and the tie rod seat is integrally embedded in the side groove of the moving mold and fixed by side screws.

[0012] Preferably, the forming cavity of the venting head is inverted conical, with a smaller opening at the end near the product cavity and a larger opening at the end near the pushing direction of the push rod.

[0013] Preferably, the clearance between the ejector pin and the corresponding through hole on the stationary mold is 0.01 to 0.02 mm on one side.

[0014] Preferably, the lever arm length at the end near the top rod is greater than the lever arm length at the end near the reset rod.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This invention completely solves the problems of air bubbles, trapped air and scorching at the end of the product frame, significantly improving the mass production yield and saving the cost of scrapping defective products.

[0016] 2. This invention solves the problem of molten tin plating in insert mold products by adjusting the process and sending the molten tin plating debris to the waste material head through the material flow, thus meeting the high-quality requirements of precision connectors and automotive parts.

[0017] 3. The parts of the mechanism of this invention are simple and have no complex structural features, which saves mold costs.

[0018] 4. The mechanism of this invention operates through the opening and closing of the mold, and the waste material head falls off automatically, without the need to add additional automated tooling equipment to remove and clean the waste material head.

[0019] 5. This invention can be widely adapted to injection molding of various plastic mold products. It has strong applicability and can be adjusted according to different needs, making it highly valuable for industry reuse. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall cross-sectional structure of the present invention; Figure 2 This is a schematic diagram of the static mold structure of the present invention; Figure 3 This is a schematic diagram of the moving mold structure of the present invention; Figure 4 This is a schematic diagram of the static model exploded structure of the present invention; Figure 5 This is a schematic diagram of the explosive structure of the moving model of the present invention; Figure 6 This is a schematic diagram of the slider and ball-head plunger in the initial mold opening state of the present invention; Figure 7 This is a schematic diagram of the structure of the present invention, showing the bending tie rod extending into the stationary mold and pushing the slider during the mold closing process; Figure 8 This is a schematic diagram of the structure of the present invention, showing the mold closing, ejector pin retraction, and reset. Figure 9 This is a schematic diagram of the state structure of the present invention after injection molding and sprue forming; Figure 10 This is a schematic diagram of the action structure of the bending tie rod moving freely in the delay gap during the initial mold opening stage of the present invention; Figure 11 This is a schematic diagram of the structure of the present invention, in which the bending tie rod pulls the slider backward and pushes the lever to push out the material head when the mold opening stroke is halfway through.

[0021] In the diagram: 1. Stationary mold; 2. Backing plate; 3. Material head; 4. Left pressure bar; 5. Right pressure bar; 6. Slider; 7. Ball head plunger; 8. Ejector rod; 9. Reset rod; 10. Pin; 11. Lever; 12. Spring; 13. Support block; 14. Moving mold; 15. Moving mold parts; 16. Product; 17. Bending tie rod; 18. Connecting screw; 19. Tie rod seat; 20. Pressure plate. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] Please see Figures 1-11 As shown, the present invention provides a technical solution: a novel fixed mold lever ejector venting head structure, comprising a stationary mold 1 and a moving mold 14; The stationary mold 1 is provided with a slider 6 and a lever linkage mechanism consisting of a lever 11, a support block 13, a reset rod 9 and a push rod 8. The support block 13 is fixed inside the stationary mold 1. The middle part of the lever 11 is hinged to the support block 13 to form a lever fulcrum. One end of the lever 11 is hinged to the reset rod 9 and the other end is hinged to the push rod 8. The stationary mold 1 is also provided with a spring 12 for continuously applying outward elastic force to the reset rod 9. The parting surface side of the stationary mold 1 is provided with an exhaust head 3 forming a cavity that communicates with the product cavity. Among them, a bent tie rod 17 is fixed on the moving mold 14, and the bent tie rod 17 and the corresponding side wall of the slider 6 are provided with mutually cooperating driving inclined surfaces. In the mold-closed state, the bent tie rod 17 is inserted into the stationary mold 1 and pushes the slider 6 to slide towards the cavity through the driving inclined surface. After the slider 6 loses its constraint on the reset rod 9, the spring 12 pushes the reset rod 9 to move and drives the ejector rod 8 to return to the position flush with the bottom surface of the cavity through the lever 11. In the mold-open state, a delayed separation gap is reserved between the bent tie rod 17 and the slider 6. When the moving mold 14 opens the stroke corresponding to this gap, its slider 6 remains stationary, while the venting head 3 detaches from the moving mold part 15 and remains in the molding cavity of the stationary mold 1. After the moving mold 14 continues to open past the delayed separation gap, the bent tie rod 17 drives the slider 6 to slide away from the cavity in the opposite direction through the driving inclined surface. Its slider 6 presses down the reset rod 9. The reset rod 9 drives the ejector rod 8 to push out in the direction of the parting surface through the fulcrum of the lever 11, and pushes out the venting head 3 that is stuck in the stationary mold 1.

[0024] A positioning groove is provided on one side of the slider 6, and a ball-head plunger 7 is provided at the corresponding position on the stationary mold 1. The steel ball of the ball-head plunger 7 is inserted into the positioning groove, and the distance of the delayed separation gap is four to six millimeters. The two ends and the middle of the lever 11 are respectively hinged to the push rod 8, the reset rod 9 and the support block 13 by the pins 10. A pad 2 is fixed on one side of the stationary mold 1. A countersunk hole corresponding to the position of the reset rod 9 is opened on the pad 2. The spring 12 is placed in the countersunk hole, and one end of the spring 12 abuts against one end of the reset rod 9. A left pressure bar 4 and a right pressure bar 5 are respectively provided on both sides of the slide groove of the stationary mold 1. The left pressure bar 4 and the right pressure bar 5 are locked on the stationary mold 1 by fasteners. The slider 6 is limited to the left pressure bar. The guide groove formed by 4 and the right pressure strip 5 slides back and forth in a single direction. The bent pull rod 17 is fixed to the side of the moving mold 14 by the pull rod seat 19. The bottom of the bent pull rod 17 is inserted into the groove of the pull rod seat 19 and locked by the connecting screw 18. The pull rod seat 19 is embedded in the side groove of the moving mold 14 and fixed by the side screw. The forming cavity of the venting head 3 is inverted cone-shaped. The opening at the end near the cavity of the product 16 is smaller, while the opening at the end near the pushing direction of the ejector rod 8 is larger. The single-sided fitting clearance between the ejector rod 8 and the corresponding through hole on the stationary mold 1 is 0.01 to 0.02 mm. The lever arm length at the end of the lever 11 near the ejector rod 8 is greater than the lever arm length at the end near the reset rod 9.

[0025] This technical solution: Before mold closing, the slider 6 is held in a predetermined position by the steel ball of the ball-head plunger 7 being inserted into the positioning groove. At this time, the slider 6 presses down the reset rod 9 and compresses the spring 12, while the ejector rod 8 is ejected to the parting surface through the lever 11. When the mold closes, the moving mold 14 moves towards the stationary mold 1, and the bent pull rod 17 extends into the stationary mold 1. Its driving inclined surface contacts the corresponding inclined surface of the slider 6 and pushes the slider 6 to slide towards the cavity. During the forward movement of the slider 6, the downward pressure constraint on the reset rod 9 is gradually released. The elastic force of the spring 12 pushes the reset rod 9 to move outward. Through the fulcrum of the lever 11, the ejector rod 8 is driven to retract synchronously. The slider 6 continues to move forward until its front inclined surface contacts the inclined surface of the ejector rod 8, pressing the ejector rod 8 down to be flush with the bottom surface of the cavity. The mechanism completes the reset, and then injection molding is performed. Air and waste gas in the cavity flow into the overflow rib through the gate to form the sprue head 3. When the mold opens, the moving mold 14 opens. In the initial 4 to 6 mm delayed separation gap, the bent pull rod 17 and the slider 9 gradually move towards the cavity. The rear side of block 6 does not contact, slider 6 remains stationary, and the sprue 3 detaches from the moving mold part 15 and remains in the inverted cone-shaped cavity of the stationary mold 1. After the moving mold 14 continues to open and passes the delayed separation gap, the inclined surface of the rear end of the bent pull rod 17 moves slider 6 away from the cavity. Sprue 6 retracts and presses down the reset rod 9, compressing the spring 12. The reset rod 9 drives the ejector rod 8 to push out towards the parting surface through the fulcrum of the lever 11. Because the lever arm of the lever 11 near the ejector rod 8 is longer, the ejection stroke and force of the ejector rod 8 are amplified, reliably ejecting the sprue 3 that is stuck in the stationary mold 1. The single-sided fitting gap of 0.01 to 0.02 mm between the ejector rod 8 and the through hole ensures smooth sliding while preventing the sprue from seeping in and getting stuck. Thus, a fully automated continuous action is achieved in which the sprue detaches from the moving mold and remains in the stationary mold when the mold is opened, and the ejector rod delays the ejection and the sprue automatically falls off. It is compact and reliable, and fundamentally solves the problem of the sprue coming out on the fixed mold side.

[0026] Steps for disassembling the static mold section Unscrew the fixing screws of the pad 2, remove the pad 2 from the stationary mold 1, and directly remove the spring 12 placed in the countersunk hole of the pad 2; Loosen the fixing screws of the support block 13 and remove the entire lever linkage mechanism; remove the pins 10 connecting the ejector rod 8, the reset rod 9, the support block 13 and the lever 11 in sequence, separate the ejector rod 8, the reset rod 9, the lever 11 and the support block 13, and complete the disassembly of the lower half of the stationary mold. Loosen the fastening screws of the left pressure bar 4 and the right pressure bar 5, remove the left and right pressure bars, and take the slider 6 out of the reserved groove of the stationary mold 1; The ball-head plunger 7 is pushed out and removed through the pre-reserved striking hole in the stationary mold 1, thus completing the disassembly of the upper part of the stationary mold.

[0027] Static mold assembly steps The ejector rod 8, reset rod 9, and support block 13 are hinged to the lever 11 by pins 10. The lever 11 has a longer lever arm at the end near the ejector rod 8 and a shorter lever arm at the end near the reset rod 9. They are assembled into a lever linkage mechanism. The support block 13 is fixed in the corresponding position inside the stationary mold 1 by screws. The spring 12 is placed in the pre-reserved countersunk hole of the pad 2, and the pad 2 is then locked to the stationary mold 1 with screws. Press the ball-head plunger 7 into the pre-reserved round hole of the stationary mold 1, install the slider 6 into the pre-reserved groove of the stationary mold 1, and fasten the left pressure bar 4 and the right pressure bar 5 to the steps on both sides of the slider 6 respectively. Tighten the screws so that the slider 6 can slide in one direction in the guide groove formed by the left and right pressure bars. Push the slider 6 so that its bottom positioning groove is locked to the ball ball of the ball-head plunger 7, and complete the assembly of the stationary mold part.

[0028] Disassembly steps of the moving mold part Loosen the fixing screws of the pressure plate 20 and take the pressure plate 20 and the moving mold part 15 out of the reserved hole of the moving mold 14 in the forward direction. Loosen the fixing screws on the side of the tie rod seat 19, remove the bent tie rod 17 and the tie rod seat 19 as a whole from the side groove of the moving mold 14, flip the tie rod seat 19 to expose the bottom connecting screw 18, loosen the connecting screw 18 to pull the bent tie rod 17 out of the groove of the tie rod seat 19, and complete the disassembly of the moving mold.

[0029] Assembly steps of moving mold part Place the moving mold part 15 into the reserved hole of the moving mold 14, press the pressure plate 20 on the step of the moving mold part 15, and tighten the screws to fix the moving mold part. Insert the bottom of the bent tie rod 17 into the pre-reserved groove of the tie rod seat 19 and tighten it with the bottom connecting screw 18. Insert the assembled tie rod seat 19 into the side groove of the moving mold 14 and tighten the side screws to complete the assembly of the moving mold.

[0030] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A novel fixed-mold lever ejector venting head structure, characterized in that, include: Static model (1) and moving model (14); The stationary mold (1) is provided with a slider (6) and a lever linkage mechanism consisting of a lever (11), a support block (13), a reset rod (9) and a push rod (8). The support block (13) is fixed inside the stationary mold (1). The middle part of the lever (11) is hinged to the support block (13) to form a lever fulcrum. One end of the lever (11) is hinged to the reset rod (9), and the other end is hinged to the push rod (8). The stationary mold (1) is also provided with a spring (12) for continuously applying outward elastic force to the reset rod (9). The parting surface side of the stationary mold (1) is provided with an exhaust head (3) forming a cavity that communicates with the product cavity. Among them, a bent tie rod (17) is fixed on the moving mold (14), and the bent tie rod (17) and the corresponding side wall of the slider (6) are provided with mutually cooperating driving inclined surfaces; In the mold-closed state, the bent tie rod (17) is inserted into the stationary mold (1) and pushes the slider (6) to slide towards the cavity through the driving inclined surface. After the slider (6) loses its constraint on the reset rod (9), the spring (12) pushes the reset rod (9) to move and drives the ejector rod (8) to return to the position flush with the bottom surface of the cavity through the lever (11). In the mold-opening state, a delay separation gap is reserved between the bent tie rod (17) and the slider (6). When the moving mold (14) opens the stroke corresponding to this gap, its slider (6) remains stationary, while the venting head (3) detaches from the moving mold part (15) and remains in the molding cavity of the stationary mold (1). After the moving mold (14) continues to open past the delay separation gap, the bent tie rod (17) drives the slider (6) to slide away from the cavity by driving the inclined plane in the opposite direction. Its slider (6) presses down the reset rod (9). The reset rod (9) drives the ejector rod (8) to push out towards the parting surface through the fulcrum of the lever (11), and pushes out the venting head (3) that is stuck in the stationary mold (1) and drops it.

2. The novel fixed mold lever ejector venting head structure according to claim 1, characterized in that: The slider (6) has a positioning groove on one side, and the stationary mold (1) has a ball plunger (7) at the corresponding position, and the steel ball of the ball plunger (7) is inserted into the positioning groove.

3. The novel fixed-mold lever ejector venting head structure according to claim 1, characterized in that: The distance of the delayed separation gap is four to six millimeters.

4. The novel fixed mold lever ejector venting head structure according to claim 1, characterized in that: The lever (11) is hinged to the top rod (8), the reset rod (9) and the support block (13) respectively by pins (10) at both ends and the middle.

5. The novel fixed mold lever ejector venting head structure according to claim 1, characterized in that: A pad (2) is fixed on one side of the stationary mold (1). A countersunk hole corresponding to the position of the reset rod (9) is opened on the pad (2). The spring (12) is placed in the countersunk hole, and one end of the spring (12) abuts against one end of the reset rod (9).

6. The novel fixed mold lever ejector venting head structure according to claim 1, characterized in that: The stationary mold (1) has a left pressure bar (4) and a right pressure bar (5) on both sides of the slide groove. The left pressure bar (4) and the right pressure bar (5) are locked on the stationary mold (1) by fasteners. The slider (6) is limited to slide back and forth in a single direction in the guide groove formed by the left pressure bar (4) and the right pressure bar (5).

7. The novel fixed mold lever ejector venting head structure according to claim 1, characterized in that: The bent tie rod (17) is fixed to the side of the moving mold (14) by the tie rod seat (19). The bottom of the bent tie rod (17) is inserted into the groove of the tie rod seat (19) and locked by the connecting screw (18). The tie rod seat (19) is embedded in the side groove of the moving mold (14) and fixed by the side screw.

8. The novel fixed mold lever ejector venting head structure according to claim 1, characterized in that: The molding cavity of the exhaust head (3) is inverted cone shape, with a smaller opening at the end near the product (16) cavity and a larger opening at the end near the pushing direction of the push rod (8).

9. The novel fixed mold lever ejector venting head structure according to claim 1, characterized in that: The clearance between the ejector pin (8) and the corresponding through hole on the stationary mold (1) is 0.01 to 0.02 mm.

10. The novel fixed mold lever ejector venting head structure according to claim 1, characterized in that: The lever arm length of the lever (11) near the top rod (8) is greater than the lever arm length near the reset rod (9).

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