Mold structure for preventing breakage of small supporting pins

Abstract

The utility model relates to a kind of mould structure of small supporting needle breakage prevention including mould main body and the ejection system being arranged in the mould main body, the ejection system includes first ejector pin plate, second ejector pin plate, small supporting needle, support column, buckle machine, elastic block, spring, oil cylinder.The utility model has the characteristics of preventing small supporting needle breakage.

Description

Technical Field

[0001] This utility model relates to the field of injection mold technology, and in particular to a mold structure for preventing small support pins from breaking. Background Technology

[0002] In the field of injection molding, for products with complex structures or large depths (i.e., deep cavities), secondary ejection molds are often used to achieve product demolding. Secondary ejection molds, through multi-stage ejection actions, prevent product deformation or sticking to the mold due to uneven force during demolding, thus ensuring product molding quality. In such molds, small ejector pins (i.e., ejector pins with drag) are one of the key components, used to assist in lifting specific areas of the product, coordinating with the overall ejection action to complete demolding.

[0003] Existing mold ejection systems typically consist of an integrated ejector plate, with small ejector pins directly fixed to it. Since secondary ejection requires a longer ejection stroke (to accommodate product depth or complex structures), the small ejector pins need to be designed to be longer to ensure the ejection action covers the required demolding stroke.

[0004] However, if the small support pin is too long, it is prone to breakage during injection molding due to injection pressure, ejection impact force, and repeated motion fatigue. A broken small support pin requires machine shutdown and mold disassembly for replacement, causing production interruption and incurring mold repair costs. Utility Model Content

[0005] The present invention provides a mold structure for preventing the small support pin from breaking, thereby solving the problems existing in related technologies. The technical solution is as follows: The mold structure for preventing breakage of small support pins provided in this embodiment of the utility model includes a mold body and an ejection system disposed within the mold body, the ejection system comprising: The first ejector plate is capable of reciprocating along the axial direction of the mold body: The second ejector plate is parallel to the first ejector plate and spaced apart, and can move synchronously with the first ejector plate or stop independently. The small support pin has one end fixed to the second ejector plate and the other end extending in a direction away from the first ejector plate, and is used to eject the product to be ejected. A support column, one end of which is fixed to the second ejector plate, and the other end of which extends toward the first ejector plate; The fastener has one end fixed to the mold body and the other end extending through the first ejector plate and located on one side of the support column. The other end of the fastener is provided with a protruding structure, and the protruding structure has a first inclined surface facing the spring block. A spring block is slidably mounted on the first ejector plate. The end of the spring block facing the buckle is provided with a second inclined surface that is adapted to the first inclined surface. A through hole is provided on the spring block, and the support column in the initial state abuts against the spring block to constrain the support column. A spring is provided on the first ejector plate, and in the initial state, the spring block is driven by the elastic force of the spring to abut against the buckle. The hydraulic cylinder has its cylinder body fixed to the first ejector plate, and its telescopic end passes through the first ejector plate and is fixed to the mold body, for driving the first ejector plate to reciprocate along the axial direction of the mold body.

[0006] In one embodiment, the angle between the first inclined surface and the mold axis is 30°-45°, and the angle between the second inclined surface and the first inclined surface is adapted.

[0007] In one embodiment, the inner diameter of the through hole is larger than the outer diameter of the support column.

[0008] In one embodiment, the edge of the through hole has a chamfer.

[0009] In one embodiment, the first ejector plate has a sliding groove extending laterally, the spring block is embedded in the sliding groove and can slide along the groove, the spring is disposed in the sliding groove, and the axis of the spring is consistent with the extension direction of the sliding groove, and the two ends of the spring are respectively fixed to the side wall of the sliding groove and the side wall of the spring block.

[0010] In one embodiment, the first ejector plate is provided with a clearance hole, which is coaxially arranged with the support column, and the shape and size of the clearance hole are the same as those of the through hole.

[0011] In one embodiment, the mold body includes a moving mold and a fixed mold that cooperate with each other; The fixed mold includes a base plate, a hot runner plate, square irons, an A plate, and a mold core. The base plate is fixedly connected to the hot runner plate. The square irons are two opposite pieces fixed to the hot runner plate. The A plate is fixed to the two square irons. The mold core is fixed to the A plate. The hot runner plate, the A plate, and the two square irons enclose a receiving space that can accommodate the ejection system. One end of the fastener is fixed to the base plate. The output end of the hydraulic cylinder passes through the first ejector plate and is fixed to the base plate. The other end of the small support pin passes through the A plate and the mold core to contact the product to be ejected and is used to eject the product to be ejected.

[0012] Implementing the above-described embodiments of the present invention will have at least the following beneficial effects: By setting up a hydraulic cylinder, a latch, a support column, a spring, and a spring block to control the ejection sequence of the first and second ejector plates, and by arranging the first and second ejector plates at intervals, the length of the small support pin can be shortened, the rigidity can be enhanced, and breakage can be avoided.

[0013] The above overview is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features of the present invention will become readily apparent from the accompanying drawings and the following detailed description. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art 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.

[0015] Figure 1 A schematic diagram of the ejection system is provided for an embodiment of this utility model; Figure 2 Another structural schematic diagram of the ejection system is provided for an embodiment of this utility model; Figure 3 This invention provides an internal cross-sectional schematic diagram of the ejection system for an embodiment of the present invention. Figure 4 for Figure 3 Enlarged schematic diagram of the structure at point A in the middle; Figure 5 A partial structural schematic diagram of the mold body is provided for an embodiment of this utility model; Figure 6 Another schematic view of the mold body is provided for an embodiment of this utility model; Figure 7 A schematic diagram of the overall structure of the mold body is provided for an embodiment of this utility model.

[0016] Marked in the image: 100. Mold body; 110. Moving model; 120. Fixed mold; 121. Base plate; 122. Hot runner plate; 123. Square iron; 124. A plate; 125. Mold core; 200. Ejection system; 210. First ejector plate; 211. Sliding groove; 212. Clearance hole; 220. Second ejector plate; 230. Small support pin; 240. Support column; 250. Fastener; 251. Protruding structure; 2511. First inclined surface; 260. Spring block; 261. Second inclined plane; 262. Through hole; 270. Spring; 280. Hydraulic cylinder. Detailed Implementation

[0017] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of this utility model are shown in the drawings. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this utility model.

[0018] It should be noted that when a component is said to be "fixed to" another component, it can be directly attached to the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0020] This embodiment provides a mold structure for preventing the breakage of a small support pin 230, including a mold body 100 and an ejection system 200 disposed within the mold body 100. The ejection system 200 includes: The first ejector plate 210 can reciprocate along the axial direction of the mold body 100: The second ejector plate 220 is parallel to the first ejector plate 210 and spaced apart, and can move synchronously with the first ejector plate 210 or stop independently. The small support pin 230 has one end fixed to the second ejector plate 220 and the other end extending in a direction away from the first ejector plate 210, and is used to eject the product to be ejected. The support column 240 has one end fixed to the second ejector plate 220 and the other end extending toward the first ejector plate 210. The fastener 250 has one end fixed to the mold body 100 and the other end extending through the first ejector plate 210 and located on one side of the support column 240. The other end of the fastener 250 is provided with a protruding structure 251, and the protruding structure 251 is provided with a first inclined surface 2511 on the side facing the spring block 260. The spring block 260 is slidably mounted on the first ejector plate 210. The end of the spring block 260 facing the buckle 250 is provided with a second inclined surface 261 that is adapted to the first inclined surface 2511. The spring block 260 is provided with a through hole 262, and the support column 240 in the initial state abuts against the spring block 260 to constrain the support column 240. Spring 270 is provided on the first ejector plate 210. In the initial state, the spring block 260 is driven by the elastic force of spring 270 to abut against the buckle 250. The cylinder 280 has its cylinder body fixed to the first ejector plate 210. The telescopic end of the cylinder 280 passes through the first ejector plate 210 and is fixed to the mold body 100. It is used to drive the first ejector plate 210 to reciprocate along the axial direction of the mold body 100.

[0021] The mold structure can be various types of injection molds, such as three-plate molds and inverted molds, suitable for deep-cavity products. The composition of the ejection system 200 also varies. This specific embodiment does not provide a complete mold structure; for example, it may include ejector pins, ejector sleeves, center support rods, and angled ejectors—common components in traditional molds used for ejecting products—mounted on the first ejector plate 210. This specific embodiment only shows a partial structure to illustrate the difference from the traditional ejection system 200 structure.

[0022] As described above, when the mold structure is an inverted mold, the small support pin 230 is installed on the second ejector plate 220, and the second ejector plate 220 is parallel to the first ejector plate 210 at intervals. The interval between the two is set to shorten the length of the small support pin 230. In this way, the rigidity of the small support pin 230 can be enhanced.

[0023] By configuring the hydraulic cylinder 280, spring 270, spring block 260, latch 250, and support column 240 in coordination, the movement sequence of the first ejector plate 210 and the second ejector plate 220 can be controlled. During one ejection, the retracted end of the hydraulic cylinder 280 drives the first ejector plate 210 to move towards the second ejector plate 220. Since the support column 240 abuts against the spring block 260, it can drive the second ejector plate 220 to move synchronously, so that the small support pin 230 ejects the product to be ejected. The first inclined surface 2511 on the protruding structure 251 of the latch 250 and the second inclined surface 261 on the spring block 260 cooperate to cause the spring block 260 to retract and compress the spring 270. The support column 240 falls into the inner diameter of the through hole 262. In this way, the second ejector plate 220 remains stationary, while the first ejector plate 210 continues to move towards the second ejector plate 220. It should be understood that the second ejector plate 220 is equipped with common components used in traditional molds for ejecting products, such as angled ejectors and ejector sleeves (shown but not marked in the figure).

[0024] It is worth noting that the product to be ejected is marked as K in the diagram.

[0025] In one embodiment, the angle between the first inclined surface 2511 and the mold axis is 30°-45°, and the angle between the second inclined surface 261 and the first inclined surface 2511 is adapted.

[0026] Specifically, the hydraulic cylinder 280 drives the first ejector plate 210 to move towards the second ejector plate 220. Since the spring block 260 is initially pressed against the latch 250 by the elastic force of the spring 270, when the first ejector plate 210 moves, the spring block 260 retracts through its own second inclined surface 261 cooperating with the first inclined surface 2511 on the protruding structure 251, thus compressing the spring 270, until it is released from the constraint of the protruding structure 251 of the latch 250. When the through hole 262 on the spring block 260 moves to the position of the support column 240, the support column 240 falls into the through hole 262. At this point, the second ejector plate 220 completes one ejection and no longer follows the first ejector plate 210. The first ejector plate 210 continues to complete a second ejection action under the drive of the hydraulic cylinder 280.

[0027] It should be understood that the support column 240 is located on the movement path of the through hole 262 (that is, the movement path of the spring block 260), and the thickness of the protrusion structure 251 is the movement stroke of the spring block 260.

[0028] In one embodiment, the inner diameter of the through hole 262 is larger than the outer diameter of the support column 240.

[0029] Specifically, avoid structural interference.

[0030] In one embodiment, the edge of the through hole 262 has a chamfer.

[0031] Specifically, when the support column 240 falls into the through hole 262, it can also enter the through hole 262 more smoothly, reducing the risk of jamming during assembly and movement.

[0032] In one embodiment, the first ejector plate 210 has a sliding groove 211 extending laterally, the spring block 260 is embedded in the sliding groove 211 and can slide along the groove, the spring 270 is disposed in the sliding groove 211, and the axis of the spring 270 is consistent with the extension direction of the sliding groove 211, and the two ends of the spring 270 are respectively fixed to the side wall of the sliding groove 211 and the side wall of the spring block 260.

[0033] In one embodiment, a clearance hole 212 is provided on the first ejector plate 210. The clearance hole 212 is coaxially arranged with the support column 240, and the shape and size of the clearance hole 212 are the same as those of the through hole 262.

[0034] In one embodiment, the mold body 100 includes a movable mold 110 and a fixed mold 120 that cooperate with each other; The fixed mold 120 includes a base plate 121, a hot runner plate 122, square irons 123, an A plate 124, and a mold core 125. The base plate 121 is fixedly connected to the hot runner plate 122. The square irons 123 are two opposite ones fixed to the hot runner plate 122. The A plate 124 is fixed to the two square irons 123. The mold core 125 is fixed to the A plate 124. The hot runner plate 122, the A plate 124, and the two square irons 123 enclose a receiving space that can accommodate the ejection system 200. One end of the fastener 250 is fixed to the base plate 121. The output end of the hydraulic cylinder 280 passes through the first ejector plate 210 and is fixed to the base plate 121. The other end of the small support pin 230 passes through the A plate 124 and the mold core 125 to contact the product to be ejected and is used to eject the product to be ejected.

[0035] It is worth noting that the seat plate 121 is fixed to the injection molding machine.

[0036] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A mold structure for preventing breakage of small support pins, characterized in that, The system includes a mold body and an ejection system disposed within the mold body, the ejection system comprising: The first ejector plate is capable of reciprocating along the axial direction of the mold body: The second ejector plate is parallel to the first ejector plate and spaced apart, and can move synchronously with the first ejector plate or stop independently. The small support pin has one end fixed to the second ejector plate and the other end extending in a direction away from the first ejector plate, and is used to eject the product to be ejected. A support column, one end of which is fixed to the second ejector plate, and the other end of which extends toward the first ejector plate; The fastener has one end fixed to the mold body and the other end extending through the first ejector plate and located on one side of the support column. The other end of the fastener is provided with a protruding structure, and the protruding structure has a first inclined surface facing the spring block. A spring block is slidably mounted on the first ejector plate. The end of the spring block facing the buckle is provided with a second inclined surface that is adapted to the first inclined surface. A through hole is provided on the spring block, and the support column in the initial state abuts against the spring block to constrain the support column. A spring is provided on the first ejector plate, and in the initial state, the spring block is driven by the elastic force of the spring to abut against the buckle. The hydraulic cylinder has its cylinder body fixed to the first ejector plate, and its telescopic end passes through the first ejector plate and is fixed to the mold body, for driving the first ejector plate to reciprocate along the axial direction of the mold body.

2. The mold structure for preventing breakage of the small support pin according to claim 1, characterized in that: The angle between the first inclined surface and the axis of the mold is 30°-45°, and the angle between the second inclined surface and the first inclined surface is adapted.

3. The mold structure for preventing breakage of the small support pin according to claim 1, characterized in that: The inner diameter of the through hole is larger than the outer diameter of the support column.

4. The mold structure for preventing breakage of small support pins according to any one of claims 1 or 3, characterized in that: The edges of the through hole are chamfered.

5. The mold structure for preventing breakage of the small support pin according to claim 1, characterized in that: The first ejector plate has a sliding groove extending laterally. The spring block is embedded in the sliding groove and can slide along the groove. The spring is disposed in the sliding groove, and the axis of the spring is consistent with the extension direction of the sliding groove. The two ends of the spring are respectively fixed to the side wall of the sliding groove and the side wall of the spring block.

6. The mold structure for preventing breakage of the small support pin according to claim 1, characterized in that: The first ejector plate is provided with a clearance hole, which is coaxially arranged with the support column, and the shape and size of the clearance hole are the same as those of the through hole.

7. The mold structure for preventing breakage of the small support pin according to claim 1, characterized in that: The main body of the mold includes a moving mold and a fixed mold that cooperate with each other; The fixed mold includes a base plate, a hot runner plate, square irons, an A plate, and a mold core. The base plate is fixedly connected to the hot runner plate. The square irons are two opposite pieces fixed to the hot runner plate. The A plate is fixed to the two square irons. The mold core is fixed to the A plate. The hot runner plate, the A plate, and the two square irons enclose a receiving space that can accommodate the ejection system. One end of the fastener is fixed to the base plate. The output end of the hydraulic cylinder passes through the first ejector plate and is fixed to the base plate. The other end of the small support pin passes through the A plate and the mold core to contact the product to be ejected and is used to eject the product to be ejected.

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