A thimble with exhaust structure

Abstract

The utility model discloses a top pin with exhaust structure, including mould and top pin, and mould is set up and is used for inserting the needle hole channel of inserting in top pin, and the needle hole channel is vertically arranged, and the upper opening of needle hole channel is formed with first cooperation bevel, and the inner wall of needle hole channel is set up with exhaust groove, and the upper end of exhaust groove is penetrated to first cooperation bevel, and the lower end is penetrated to the lower surface of mould, the top of top pin is equipped with the top head that protrudes outward, and the bottom edge of top head is formed with second cooperation bevel, and second cooperation bevel is matched with first cooperation bevel, and top pin is movably inserted in needle hole channel, and exhaust gap is formed between second cooperation bevel and first cooperation bevel, and the gap size of exhaust gap is 0.05mm 0.08mm, and the outer wall of top pin and exhaust groove are surrounded and form exhaust hole channel, and exhaust hole channel is communicated with exhaust gap, and forms exhaust structure. Optimize exhaust structure, reduce the influence of negative pressure when ejection, make the product ejection process more smooth, reduce the probability of product being damaged by ejection.

Description

Technical Field

[0001] This utility model relates to the field of mold technology, and in particular to an ejector pin with a venting structure. Background Technology

[0002] Ejector pins in injection molds are the core components, mainly used to push the cooled and solidified product out of the mold. They also serve to separate the product, clear small holes, and stabilize the internal structure of the mold.

[0003] Existing ejector pin structures, such as those described in patent application number "CN202122910327.0" and titled "An Ejector Pin Venting Structure for Injection Molds," include a mold core, an ejector pin, and a countersunk head. The surface of the mold core has a pin groove, and the countersunk head is fixed to the end of the ejector pin. The ejector pin is inserted into the pin groove. An annular venting groove is formed on the surface of the ejector pin near its top end face. An escape groove is formed at the mating position between the ejector pin and the mold core, extending into the interior of the annular venting groove. The depth of the escape groove is consistent with the depth of the annular venting groove. By providing the escape groove and the annular venting groove, gas inside the mold flows into the escape groove for storage. When the injection molded part is ejected by the ejector pin, the gas is discharged from the interior of the annular venting groove, avoiding air entrapment problems, improving product yield, and increasing trial molding efficiency.

[0004] However, this ejector pin structure still has the following problems: 1. The annular venting groove is spaced from the ejector pin end face. During the ejection process, the ejector pin is prone to insufficient clearance due to excessive ejection speed, resulting in a negative pressure state inside the cavity. The product adheres to the cavity and is damaged by the ejection force of the ejector pin; 2. The annular venting groove and the venting groove are prone to being blocked by molten plastic after long-term use, affecting the venting effect; 3. It lacks a self-cleaning structure for the duct. Utility Model Content

[0005] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a ejector pin with an exhaust structure to solve the above problems.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a ejector pin with a venting structure, comprising a mold core and an ejector pin. The mold core has an insertion channel for inserting into the ejector pin. The insertion channel is vertically arranged, and a first mating angle is formed at the upper opening of the insertion channel. A venting groove is formed on the inner wall of the insertion channel, with the upper end of the venting groove extending to the first mating angle and the lower end extending to the lower surface of the mold core. The top of the ejector pin has an outwardly protruding top head, and a second mating angle is formed at the bottom edge of the top head. The second mating angle matches the first mating angle. The ejector pin is movably inserted into the insertion channel, and a venting gap is formed between the second mating angle and the first mating angle. The size of the venting gap is 0.05mm-0.08mm. The outer wall of the ejector pin and the venting groove surround each other to form a venting channel, which connects to the venting gap and forms a venting structure.

[0007] In a further technical solution, a limiting key protruding towards the center is formed on the inner wall of the insertion pin channel on the side opposite to the exhaust groove. The upper end of the limiting key is spaced apart from the first mating angle, and the bottom end of the limiting key extends to the lower opening of the insertion pin channel. A limiting keyway is formed on one side of the ejector pin. The upper end of the limiting keyway is closed, and the lower end of the limiting keyway extends to the bottom surface of the ejector pin. The limiting keyway of the ejector pin is movably engaged with the limiting key. When the upper end of the limiting keyway is engaged with the upper end of the limiting key, an exhaust gap is just left between the first mating angle and the second mating angle.

[0008] In a further technical solution, the upper part of the mold core is formed with a cavity; the surface of the ejector head matches the inner surface of the cavity, and the surface of the ejector head is provided with a grooved structure to increase the ejection friction between the ejector head and the product.

[0009] In a further technical solution, the groove structure includes at least two spaced force grooves, with both ends of the force grooves penetrating the side of the top head. The cross-section of the force groove is semi-circular, and the groove width is 0.2mm-0.5mm.

[0010] In a further technical solution, a countersunk head is installed at the bottom of the ejector pin, and a connecting hole is opened on the bottom end face of the ejector pin. The connecting hole is formed with internal threads. A connecting rod is formed at the top of the countersunk head, and the surface of the connecting rod is formed with external threads. The countersunk head is threaded to the connecting hole through the connecting rod.

[0011] In a further technical solution, the outer wall of the ejector pin is also formed with a protrusion that matches the vent groove and is aligned vertically with the vent groove. When the ejector pin is pulled out, the protrusion is aligned and passes through the vent groove under the positioning cooperation of the limiting keyway and the limiting key, so as to achieve self-cleaning of the vent groove when the ejector pin is pulled out.

[0012] In a further technical solution, the cross-sectional shape of the exhaust groove is rectangular, with a width of 0.5mm-1mm and a depth of 0.5mm-1mm.

[0013] In a further technical solution, the width of the exhaust groove and the diameter of the ejector pin form a first set ratio, which is 1:25-35.

[0014] In a further technical solution, a second set ratio is formed between the diameters of the ejector pin and the ejector head, and the second set ratio is 1:1.3-1.8.

[0015] In a further technical solution, the inclined surfaces of the first and second mating angles form the same tilt angle with the axis of the ejector pin, and the tilt angle is 45°-85°.

[0016] The advantages of this invention compared to the prior art after adopting the above structure are:

[0017] 1. The first and second mating angles form an exhaust gap, which is connected to the exhaust channel to form an exhaust structure. This ensures that black spots and bubbles are avoided between the product and the mold core during the injection molding process. It also reduces the gap between the exhaust structure and the ejector surface, reduces the negative pressure during ejection, makes the product ejection process smoother, and reduces the chance of the product being damaged.

[0018] 2. The ejector pin and countersunk head are connected by threads and can be detached. The ejector pin can be pulled out from bottom to top for maintenance. During the process of pulling out the ejector pin or ejecting the product, the ejector pin passes through the venting groove through the protrusion at its bottom and completes the self-cleaning of the venting groove. The design is ingenious and reduces the maintenance cost of the mold.

[0019] 3. A circumferential positioning key structure is provided between the ejector pin and the insertion pin channel to ensure the minimum gap of the venting clearance and the axial alignment design between the protrusion and the venting groove, and to prevent the ejector pin from rotating during the ejection and demolding process, thereby causing the ejector head to wear the product.

[0020] 4. The ejector head surface is provided with a grooved structure to increase ejection force, thereby increasing the contact friction between the ejector head and the injection molded product. During ejection, the product is less likely to slip or deviate, ensuring a smooth and controllable ejection process. Attached Figure Description

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] Figure 1 This is a schematic diagram of the structure of this utility model.

[0023] Figure 2 This is a cross-sectional schematic diagram of the present invention.

[0024] Figure 3 This is a schematic diagram of the ejector pin in this utility model.

[0025] Figure 4 This is an exploded view of the ejector pin in this utility model. Detailed Implementation

[0026] The following are merely preferred embodiments of the present invention and do not limit the scope of protection of the present invention.

[0027] like Figures 1 to 4 As shown, an ejector pin 2 with a venting structure includes a mold core 1 and an ejector pin 2. The mold core 1 has an insertion channel 10 for inserting the ejector pin 2. The insertion channel 10 is vertically arranged. A first mating angle 101 is formed at the upper opening of the insertion channel 10. A venting groove 102 is formed on the inner wall of the insertion channel 10. The upper end of the venting groove 102 extends through the first mating angle 101, and the lower end extends through the lower surface of the mold core 1. The top of the ejector pin 2 has an outwardly protruding top head 21. A second mating angle 211 is formed at the bottom edge of the top head 21. The second mating angle 211 matches the first mating angle 101. The ejector pin 2 is movably inserted into the insertion channel 10. A venting gap is formed between the second mating angle 211 and the first mating angle 101. The size of the venting gap is 0.05 mm. The outer wall of the ejector pin 2 and the venting groove 102 surround each other to form a venting channel. The venting channel connects to the venting gap and forms a venting structure.

[0028] The first mating angle 101 and the second mating angle 211 form an exhaust gap, which is connected to the exhaust channel to form an exhaust structure. This ensures that the mold avoids the formation of black spots and bubbles between the product and the mold core 1 during the injection process. It also reduces the gap between the exhaust structure and the surface of the ejector head 21, reduces the negative pressure during ejection, makes the product ejection process smoother, and reduces the chance of the product being damaged.

[0029] Specifically, a center-protruding limiting key 103 is formed on the inner wall of the pin insertion channel 10 opposite to the exhaust groove 102. The upper end of the limiting key 103 is spaced from the first mating angle 101, and the bottom end of the limiting key 103 extends to the lower opening of the pin insertion channel 10. A limiting keyway 22 is formed on one side of the ejector pin 2. The upper end of the limiting keyway 22 is closed, and the lower end of the limiting keyway 22 extends to the bottom surface of the ejector pin 2. The limiting keyway 22 of the ejector pin 2 is movably engaged with the limiting key 103. When the upper end of the limiting keyway 22 is engaged with the upper end of the limiting key 103, an exhaust gap is just left between the first mating angle 101 and the second mating angle 211.

[0030] A circumferential positioning key structure is provided between the ejector pin 2 and the insertion hole 10 to ensure the minimum gap of the venting gap, as well as the axial alignment design between the protrusion 23 and the venting groove 102, and to prevent the ejector pin 2 from rotating during the ejection and demolding process, thereby causing the ejector head 21 to wear the product.

[0031] Specifically, the upper part of the mold core 1 is formed with a cavity; the surface of the ejector head 21 matches the inner side of the cavity, and the surface of the ejector head 21 is provided with a groove structure 212 for increasing the ejection friction between the ejector head and the product.

[0032] A grooved structure 212 is provided on the surface of the ejector head 21 to increase the ejection force, thereby increasing the contact friction between the ejector head 21 and the injection molded product. This makes it less likely for the product to slide or deviate during ejection, ensuring a smooth and controllable ejection process.

[0033] Specifically, the groove structure 212 includes at least two spaced force grooves, with both ends of the force grooves penetrating the side of the top head 21. The cross-section of the force groove is semi-circular, and the groove width is 0.2mm-0.5mm.

[0034] Specifically, a countersunk head 25 is installed at the bottom of the ejector pin 2, and a connecting hole 24 is opened on the bottom end face of the ejector pin 2. The connecting hole 24 is formed with internal threads. A connecting rod 251 is formed on the top of the countersunk head 25, and an external thread is formed on the surface of the connecting rod 251. The countersunk head 25 is threaded to the connecting hole 24 through the connecting rod 251.

[0035] Specifically, the outer wall of the ejector pin 2 is also formed with a protrusion 23, which matches the vent groove 102 and is vertically aligned with the vent groove 102. The protrusion 23 is located in the lower middle part of the ejector pin 23. During the ejection process of the ejector pin 2, the protrusion 23 passes through the vent groove 102 completely. When the ejector pin 2 is pulled out, the protrusion 23 is aligned with and passes through the vent groove 102 under the positioning cooperation of the limiting keyway 22 and the limiting protrusion 103, so as to achieve self-cleaning of the vent groove 102 when the ejector pin is pulled out.

[0036] The ejector pin 2 and the countersunk head 25 are connected by threads and can be detached. The ejector pin 2 can be pulled out from bottom to top for maintenance. During the process of pulling out the ejector pin 2 or ejecting the product, the ejector pin 23 at its bottom passes through the venting groove 102 and completes the self-cleaning of the venting groove 102. The design is ingenious and reduces the maintenance cost of the mold.

[0037] Specifically, the exhaust groove 102 has a rectangular cross-sectional shape, with a width of 1 mm and a depth of 1 mm.

[0038] Specifically, the width of the exhaust groove 102 and the diameter of the ejector pin 2 form a first set ratio, which is 1:25.

[0039] Specifically, a second set ratio is formed between the diameters of the ejector pin 2 and the ejector head 21, and the second set ratio is 1:1.3.

[0040] Specifically, the inclined surfaces of the first mating angle 101 and the second mating angle 211 form the same inclination angle with the axis of the ejector pin 2, and the inclination angle is 45°.

[0041] The above description is only a preferred embodiment of this utility model. For those skilled in the art, there will be changes in the specific implementation method and application scope based on the idea of ​​this utility model. The content of this specification should not be construed as a limitation of this utility model.

Claims

1. A ejector pin with a venting structure, comprising a mold core and an ejector pin, wherein the mold core has an insertion channel for inserting into the ejector pin, the insertion channel being vertically arranged, characterized in that: The upper opening of the pin insertion channel is formed with a first mating angle, and the inner wall of the pin insertion channel is provided with a venting groove. The upper end of the venting groove extends through the first mating angle, and the lower end extends through the lower surface of the mold core. The top of the ejector pin is provided with an outwardly protruding top head, and the bottom edge of the top head is formed with a second mating angle. The second mating angle matches the first mating angle. The ejector pin is movably inserted into the pin insertion channel. A venting gap is formed between the second mating angle and the first mating angle. The size of the venting gap is 0.05mm-0.08mm. The outer wall of the ejector pin and the venting groove surround each other to form a venting channel. The venting channel connects to the venting gap and forms a venting structure.

2. The ejector pin with an exhaust structure according to claim 1, characterized in that: The inner wall of the insertion hole is formed with a center-protruding limiting key on the side opposite to the exhaust groove. The upper end of the limiting key is spaced from the first mating angle, and the bottom end of the limiting key extends to the lower opening of the insertion hole. A limiting keyway is formed on one side of the ejector pin. The upper end of the limiting keyway is closed, and the lower end of the limiting keyway extends to the bottom surface of the ejector pin. The limiting keyway of the ejector pin is movably engaged with the limiting key. When the upper end of the limiting keyway is engaged with the upper end of the limiting key, the exhaust gap is exactly left between the first mating angle and the second mating angle.

3. A ejector pin with an exhaust structure according to claim 2, characterized in that: The upper part of the mold core is formed with a cavity; the surface of the ejector head matches the inner surface of the cavity, and the surface of the ejector head is provided with a groove structure to increase the ejection friction with the product.

4. A ejector pin with a venting structure according to claim 3, characterized in that: The groove structure includes at least two spaced force grooves, with both ends of the force grooves penetrating the side of the top head. The cross-section of the force groove is semi-circular, and the groove width is 0.2mm-0.5mm.

5. A ejector pin with a venting structure according to claim 1, characterized in that: A countersunk head is installed at the bottom of the ejector pin, and a connecting hole is formed on the bottom end face of the ejector pin. The connecting hole is formed with internal threads. A connecting rod is formed on the top of the countersunk head, and external threads are formed on the surface of the connecting rod. The countersunk head is threadedly connected to the connecting hole through the connecting rod.

6. A ejector pin with a venting structure according to claim 5, characterized in that: The outer wall of the ejector pin is also formed with a protrusion that matches the vent groove and is aligned vertically with the vent groove. When the ejector pin is pulled out, the protrusion is aligned with and passes through the vent groove under the positioning cooperation of the limiting keyway and the limiting key, so as to achieve self-cleaning of the vent groove when the ejector pin is pulled out.

7. A ejector pin with an exhaust structure according to claim 1, characterized in that: The exhaust groove has a rectangular cross-sectional shape, with a width of 0.5mm-1mm and a depth of 0.5mm-1mm.

8. A ejector pin with a venting structure according to claim 7, characterized in that: The width of the venting groove and the diameter of the ejector pin form a first set ratio, which is 1:25-35.

9. A ejector pin with a venting structure according to claim 8, characterized in that: A second predetermined ratio is formed between the diameter of the ejector pin and the diameter of the ejector head, and the second predetermined ratio is 1:1.3-1.

8.

10. A ejector pin with a venting structure according to claim 9, characterized in that: The inclined surfaces of the first and second mating angles form the same inclination angle with the axis of the ejector pin, and the inclination angle is 45°-85°.

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