A switchable airway injection mold structure

Abstract

The utility model relates to the field of injection moulding, and the utility model discloses an injection mould structure with switchable air channel, which comprises: a B plate, a back mould core, an A plate, a front mould core, a flow cutting insert, an air channel insert and an air channel control element, the back mould core is provided with a main flow channel, two branch flow channels, a back mould exhaust groove and two back mould cavities, the main flow channel is arranged between the two cavities, the back mould exhaust groove and the two branch flow channels are connected to the same end of the main flow channel, the front mould core is provided with two turnover flow channels, two flow cutting inserts are arranged in the middle of the two branch flow channels respectively, the two flow cutting inserts are rotatably connected to the back mould core, the air channel insert is arranged in the middle of the back mould exhaust groove, the air channel insert is rotatably connected to the back mould core, and the air channel control element is eccentrically rotatably arranged at one end of the air channel insert. The exhaust capacity of the cavity can be finely adjusted according to the change of the internal volume of the cavity, the exhaust capacity is adapted to the volume of the cavity, and the quality defects such as burrs of the product are avoided.

Description

Technical Field

[0001] This utility model relates to the field of injection molding, and in particular to an injection mold structure with switchable air passages. Background Technology

[0002] In injection molding, a certain amount of air naturally exists within the mold cavity. The high temperature of the molten material causes residual moisture to evaporate and may even cause some unstable components to decompose and produce gas, resulting in a large amount of gas within the mold cavity. If this gas cannot be expelled from the cavity in time, it will lead to air bubbles forming inside the molded part.

[0003] Since products with similar specifications and models have little difference in overall structure and shape, different specifications and models are often produced using the same mold by changing inserts in order to save costs.

[0004] Existing injection molds facilitate the discharge of gas from the molding cavity by creating multiple venting grooves on the parting surface of the mold core or by setting the ejector pins and mold core to a clearance fit.

[0005] When the venting capacity of the venting channel is too large, material may escape from the venting channel, causing burrs on the product; when the venting capacity is insufficient, it will not achieve its purpose of venting. Therefore, the venting capacity of the venting channel needs to be set according to the volume of the cavity. When changing to produce other similar specifications and models, it is necessary to replace the inserts inside the cavity. The shape of the inserts inside the cavity will change, resulting in a change in the cavity volume. Since the venting channel is a fixed structure, if the venting channel cannot be adjusted synchronously when replacing the inserts, the venting capacity will be mismatched with the cavity volume, leading to quality defects such as burrs on the product. Utility Model Content

[0006] The purpose of this utility model is to provide an injection mold structure with switchable air channels, so that when changing the insert of the rear mold core, the air venting volume can be reasonably and finely adjusted according to the change of the internal volume of the cavity by controlling the opening or closing of the air venting groove on the rear mold, so as to avoid product defects.

[0007] To achieve the above objectives, this utility model adopts the following technical solution: a switchable air passage injection mold structure, comprising: B plate, the B plate is provided with a rear mold core, the rear mold core is provided with a main channel, two branch channels, a rear mold venting groove and two rear mold cavities, the main channel is located between the two cavities, and the rear mold venting groove and the two branch channels are all connected to the same end of the main channel; Plate A, the plate A is provided with a front mold core, the front mold core is provided with a sprue sleeve in the middle, the sprue sleeve is connected to the middle of the main runner, the front mold core is provided with two flip-up runners, and the two ends of each flip-up runner are respectively connected to the rear mold cavity and the branch runner. Two flow-blocking inserts are respectively disposed in the middle of the two flow channels. Both flow-blocking inserts are rotatably connected to the rear mold core. The flow-blocking inserts are used to control the flow channels to be opened or closed. An air passage insert is provided in the middle of the rear mold venting groove. The air passage insert is rotatably connected to the rear mold core. The air passage insert is used to control the opening or closing of the rear mold venting groove. An airway control element is provided, which is configured in a one-to-one correspondence with an airway insert. One end of the airway control element is eccentrically and rotatably mounted on the airway insert. The airway control element is used to control the rotation of the airway insert.

[0008] Preferably, the other end of the airway control element is detachably mounted on plate B, and the centerline of the airway control element is perpendicular to the centerline of the airway insert.

[0009] Preferably, the B plate is detachably provided with a baffle, and the airway control element is detachably mounted on the baffle by fastening screws. The baffle is provided with a plurality of through holes at intervals for the fastening screws to pass through, and one end of the airway control element is provided with a threaded hole that matches the fastening screws.

[0010] Preferably, the side of the B plate is provided with a first rectangular groove, the side of the rear mold core is provided with a second rectangular groove, the rear mold core is provided with a circular groove, the air passage insert is rotatably disposed inside the circular groove, the two ends of the second rectangular groove are respectively connected to the interior of the first rectangular groove and the circular groove, and the two ends of the air passage control element are respectively disposed inside the interior of the first rectangular groove and the second rectangular groove.

[0011] Preferably, the airway control element is a straight rod, and the cross-sections of the airway control element, the first rectangular groove, and the second rectangular groove are all rectangular. The centerline of the airway control element is parallel to the centerline of the first rectangular groove. The cross-section of the airway control element is half the cross-section of the first rectangular groove, and the cross-section of the airway control element is half the cross-section of the second rectangular groove.

[0012] Preferably, the airway insert includes an insert body, a base, and two fixed shafts, the two fixed shafts being symmetrically fixed between the insert body and the base, and one end of the airway control element being rotatably connected to the fixed shafts.

[0013] Preferably, the injection mold structure with switchable air passages further includes an ejector pin, an ejector hole is provided in the middle of the flow-blocking insert, one end of the ejector pin passes through the ejector hole, and the cross-sections of the ejector hole and the ejector pin are both regular polygons.

[0014] Preferably, the flow-blocking insert is rotatably connected to a connecting rod, and the end of the connecting rod away from the flow-blocking insert is detachably mounted on plate B. The center line of the connecting rod is perpendicular to the center line of the flow-blocking insert. Both plate B and the rear mold core are provided with receiving grooves for accommodating the connecting rod, and the connecting rod is clearance-fitted with the receiving groove.

[0015] Preferably, the front mold core is provided with a front mold cavity, and each front mold cavity is provided with a plurality of front mold venting grooves.

[0016] Preferably, the air passage insert is disposed in the middle of each of the front mold venting grooves, the air passage insert is rotatably connected to the front mold core, the air passage insert disposed in the front mold core is detachably connected to the A plate, and the air passage insert is used to control the opening or closing of the front mold venting groove.

[0017] The beneficial effects of this invention are as follows: When the air passage control element inside plate B is displaced, the connection position between the air passage control element and the air passage insert will rotate in a circular motion. The air passage control element controls the air passage insert to rotate 90 degrees, allowing the air passage insert to switch between a cut-off state and a conductive state. This allows for the control of cutting off or opening the rear mold venting groove on the rear mold core without stopping the machine. The venting volume of the cavity can be finely adjusted according to changes in the internal volume of the cavity, ensuring that the venting volume matches the cavity volume and avoiding quality defects such as burrs on the product. Attached Figure Description

[0018] The accompanying drawings further illustrate the present invention, but the embodiments in the drawings do not constitute any limitation on the present invention.

[0019] Figure 1 This is a schematic diagram of the structure of the rear mold provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of the front mold provided in an embodiment of the present invention; Figure 3 for Figure 1 A magnified view of a portion of region A in the middle; Figure 4 This is a schematic diagram of the structure of an airway control element provided in an embodiment of the present invention; Figure 5 This is a schematic diagram of the structure of a flow-blocking insert provided in an embodiment of the present invention; Markings in the diagram: 1: B plate; 2: rear mold core; 3: main runner; 4: branch runner; 5: intercepting insert; 6: rear mold venting groove; 7: air passage insert; 8: baffle; 9: A plate; 10: front mold core; 11: flip runner; 12: air passage control element. Detailed Implementation

[0020] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of this utility model.

[0021] It should be noted that, in this utility model, unless otherwise stated, when an element is referred to as "fixed to" or "set on" another element, it can be directly on the other element or may have an intervening element present at the same time. "Inner" and "outer" refer to the inner and outer contours.

[0022] like Figures 1-4 As shown in the figure, an embodiment of the present invention provides an injection mold structure with switchable air passages, comprising: B plate 1, the B plate 1 is provided with a rear mold core 2, the rear mold core 2 is provided with a main flow channel 3, two branch flow channels 4, a rear mold venting groove 6 and two rear mold cavities, the main flow channel 3 is located between the two cavities, and the rear mold venting groove 6 and the two branch flow channels 4 are all connected to the same end of the main flow channel 3. A plate 9, the A plate 9 is provided with a front mold core 10, the front mold core 10 is provided with a sprue sleeve in the middle, the sprue sleeve is connected to the middle of the main runner 3, the front mold core 10 is provided with two flip runners 11, and the two ends of each flip runner 11 are respectively connected to the rear mold cavity and the branch runner 4. Two flow-blocking inserts 5 are respectively disposed in the middle of the two flow channels 4. Both flow-blocking inserts 5 are rotatably connected to the rear mold core 2. The flow-blocking inserts 5 are used to control the flow channels 4 to be open or closed. Air passage insert 7, the air passage insert 7 is disposed in the middle of the rear mold exhaust groove 6, the air passage insert 7 is rotatably connected to the rear mold core 2, the air passage insert 7 disposed in the rear mold core 2 is used to control the opening or closing of the rear mold exhaust groove 6; An airway control element 12 is slidably disposed inside plate B 1. The airway control element 12 is disposed in a one-to-one correspondence with the airway insert 7. One end of the airway control element 12 is eccentrically and rotatably disposed on the airway insert 7. The airway control element 12 is used to control the rotation of the airway insert 7.

[0023] Preferably, the other end of the air passage control element 12 is detachably mounted on plate B 1, and the centerline of the air passage control element 12 is perpendicular to the centerline of the air passage insert 7. Fixing the air passage control element 12 to plate B 1 prevents the air passage insert 7 from rotating during injection molding, thus avoiding any impact on the exhaust volume.

[0024] The B-plate 1 is detachably equipped with a baffle 8. The airway control element 12 is detachably mounted on the baffle 8 via fastening screws. The baffle 8 has several through holes spaced apart for the fastening screws to pass through. One end of the airway control element 12 has a threaded hole that matches the fastening screws. Since one end of the airway control element 12 is rotatably mounted on the airway insert 7, during the rotation of the airway insert 7 controlled by the airway control element 12, one end of the airway insert 7 will move along an arc-shaped path. During the adjustment of the airway insert 7, one end of the airway insert 7 will extend to the outside of the B-plate 1. When the baffle 8 is fixed on the B-plate 1, the airway insert 7 is fixed inside the first rectangular groove by the B-plate 1, and the airway insert 7 is locked and cannot rotate. By fixing the airway control element 12 to different positions on the baffle 8, the airway insert 7 can be controlled to switch between a cut-off state and a conduction state.

[0025] The B plate 1 has a first rectangular groove on its side, the rear mold core 2 has a second rectangular groove on its side, and the rear mold core 2 has a circular groove. The air passage insert 7 is rotatably disposed inside the circular groove. The two ends of the second rectangular groove are respectively connected to the interiors of the first rectangular groove and the circular groove. The two ends of the air passage control element 12 are respectively disposed inside the first rectangular groove and the second rectangular groove. The first rectangular groove and the second rectangular groove guide the air passage control element 12 and limit the sliding range of the air passage control element 12.

[0026] The airway control element 12 is a straight rod. The cross-sections of the airway control element 12, the first rectangular groove, and the second rectangular groove are all rectangular. The centerline of the airway control element 12 is parallel to the centerline of the first rectangular groove. The cross-section of the airway control element 12 is half the cross-section of the first rectangular groove, and the cross-section of the airway control element 12 is half the cross-section of the second rectangular groove. When the airway control element 12 moves, it will translate within the first rectangular groove. Since one end of the airway control element 12 is rotatably mounted on the airway insert 7, the airway insert 7 will move along an arc-shaped path during the rotation controlled by the airway control element 12. One end of the airway insert 7 will extend to the outside of the B plate 1. When the baffle 8 is fixed on the B plate 1, the airway insert 7 is fixed inside the first rectangular groove by the B plate 1, and the airway insert 7 is locked and cannot rotate.

[0027] The airway insert 7 includes an insert body, a base, and two fixed shafts. The two fixed shafts are symmetrically fixed between the insert body and the base. One end of the airway control element 12 is rotatably connected to the fixed shaft. The center lines of the two fixed shafts are parallel to and spaced apart from the center line of the insert body. The airway insert 7 is rotatably connected to the airway control element 12 via the fixed shafts. When the airway control element 12 is translated, the relative position between the airway control element 12 and the airway insert 7 changes. The airway control element 12 drives the fixed shaft to rotate to a preset position, controlling the airway insert 7 to rotate 90 degrees. The rotation of the airway insert 7 can be controlled without stopping the machine.

[0028] The injection mold structure with switchable air passages also includes an ejector pin. The flow-blocking insert 5 has an ejection hole in its center, and one end of the ejector pin passes through the ejection hole. Both the ejection hole and the ejector pin have regular polygonal cross-sections. Since the ejector pin is fixed to the ejector plate, when adjusting the flow-blocking insert 5, the flow-blocking insert 5 is disassembled and rotated, and then the rotated flow-blocking insert 5 is fixed to one end of the ejector pin. This allows for quick control of switching the flow-blocking insert 5 to either a cut-off or open state.

[0029] In one embodiment, the front mold core 10 is provided with a front mold cavity, and each front mold cavity is provided with a plurality of front mold venting grooves. The front mold venting grooves are always kept open, and the rear mold venting grooves 6 are cut off or opened through the air passage insert 7, thereby fine-tuning the venting volume.

[0030] The air passage insert 7 is also disposed in the middle of each of the front mold exhaust grooves. The air passage insert 7 is rotatably connected to the front mold core 10. The air passage insert 7 disposed in the front mold core 10 is detachably connected to the A plate 9. The air passage insert 7 is used to control the opening or closing of the front mold exhaust groove.

[0031] When the air passage control element 12 is fixed to different positions on the baffle 8 by the fastening screws, the relative position of the air passage control element 12 and the choking insert 5 will change. The air passage control element 12 controls the air passage insert 7 to rotate 90 degrees, so that the air passage insert 7 switches between the cut-off state and the open state. The front mold venting groove on the front mold core 10 can be cut off or opened without stopping the machine, thereby controlling the venting volume of the front mold.

[0032] like Figure 5 As shown, in one embodiment, the flow-blocking insert 5 is rotatably connected to a connecting rod. The end of the connecting rod away from the flow-blocking insert 5 is detachably mounted on plate B 1. The center line of the connecting rod is perpendicular to the center line of the flow-blocking insert 5. Both plate B 1 and the rear mold core 2 are provided with receiving grooves for accommodating the connecting rod. The connecting rod is clearance-fitted with the receiving groove.

[0033] Both the flow-blocking insert 5 and the airway insert 7 include an insert body, a base, and two fixed shafts. The two fixed shafts are symmetrically fixed between the insert body and the base. One end of the airway control element 12 is rotatably connected to the fixed shaft.

[0034] The B plate 1 is detachably provided with several baffles 8, each baffle 8 corresponding to an airway control element 12. The airway control element 12 is detachably mounted on the baffle 8 by fastening screws. Each baffle 8 is detachably mounted on a connecting rod by fastening screws. The connecting rod is detachably mounted on the baffle 8 by fastening screws. Each baffle 8 has two through holes spaced apart for the fastening screws to pass through. One end of the airway control element 12 has a threaded hole that matches the fastening screw.

[0035] When the connecting rod is fixed to different positions on the baffle 8 by the fastening screw, the relative position of the connecting rod and the air passage insert 7 will change. The connecting rod controls the flow-blocking insert 5 to rotate 90 degrees, and the flow-blocking insert 5 can be switched between the cut-off state and the conduction state without stopping the machine.

[0036] The technical features of the embodiments described above can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of this utility model, and these should all be considered to be within the scope of this specification.

Claims

1. A switchable air passage injection mold structure, characterized in that: include: B plate, the B plate is provided with a rear mold core, the rear mold core is provided with a main channel, two branch channels, a rear mold venting groove and two rear mold cavities, the main channel is located between the two cavities, and the rear mold venting groove and the two branch channels are all connected to the same end of the main channel; Plate A, the plate A is provided with a front mold core, the front mold core is provided with a sprue sleeve in the middle, the sprue sleeve is connected to the middle of the main runner, the front mold core is provided with two flip-up runners, and the two ends of each flip-up runner are respectively connected to the rear mold cavity and the branch runner. Two flow-blocking inserts are respectively disposed in the middle of the two flow channels. Both flow-blocking inserts are rotatably connected to the rear mold core. The flow-blocking inserts are used to control the flow channels to be opened or closed. An air passage insert is provided in the middle of the rear mold venting groove. The air passage insert is rotatably connected to the rear mold core. The air passage insert is used to control the opening or closing of the rear mold venting groove. An airway control element is provided, which is configured in a one-to-one correspondence with an airway insert. One end of the airway control element is eccentrically and rotatably mounted on the airway insert. The airway control element is used to control the rotation of the airway insert.

2. The injection mold structure with switchable air passages according to claim 1, characterized in that: The other end of the airway control element is detachably mounted on plate B, and the centerline of the airway control element is perpendicular to the centerline of the airway insert.

3. The injection mold structure with switchable air passages according to claim 2, characterized in that: The B plate is detachably equipped with a baffle. The airway control element is detachably mounted on the baffle by fastening screws. The baffle is provided with a plurality of through holes for the fastening screws to pass through at intervals. One end of the airway control element is provided with a threaded hole that matches the fastening screw.

4. The injection mold structure with switchable air passages according to claim 2, characterized in that: The B plate has a first rectangular groove on its side, the rear mold core has a second rectangular groove on its side, the rear mold core has a circular groove, the air passage insert is rotatably disposed inside the circular groove, the two ends of the second rectangular groove are respectively connected to the first rectangular groove and the circular groove, and the two ends of the air passage control element are respectively disposed inside the first rectangular groove and the second rectangular groove.

5. The injection mold structure with switchable air passages according to claim 4, characterized in that: The airway control element is a straight rod. The cross-section of the airway control element, the cross-section of the first rectangular groove, and the cross-section of the second rectangular groove are all rectangular. The centerline of the airway control element is parallel to the centerline of the first rectangular groove. The cross-section of the airway control element is half the cross-section of the first rectangular groove, and the cross-section of the airway control element is half the cross-section of the second rectangular groove.

6. The injection mold structure with switchable air passages according to claim 5, characterized in that: The airway insert includes an insert body, a base, and two fixed shafts. The two fixed shafts are symmetrically fixed between the insert body and the base. One end of the airway control element is rotatably connected to the fixed shaft.

7. The injection mold structure with switchable air passages according to claim 1, characterized in that: It also includes a ejector pin, and the middle part of the intercepting insert has an ejection hole. One end of the ejector pin passes through the ejection hole, and the cross-section of the ejection hole and the ejector pin are both regular polygons.

8. The injection mold structure with switchable air passages according to claim 1, characterized in that: The flow-blocking insert is rotatably connected to a connecting rod. The end of the connecting rod away from the flow-blocking insert is detachably mounted on plate B. The center line of the connecting rod is perpendicular to the center line of the flow-blocking insert. Both plate B and the rear mold core are provided with receiving grooves for accommodating the connecting rod, and the connecting rod is clearance-fitted with the receiving groove.

9. The injection mold structure with switchable air passages according to claim 1, characterized in that: The front mold core is provided with a front mold cavity, and each front mold cavity is provided with several front mold venting grooves.

10. The injection mold structure with switchable air passages according to claim 9, characterized in that: The air passage insert is disposed in the middle of each of the front mold venting grooves. The air passage insert is rotatably connected to the front mold core. The air passage insert disposed in the front mold core is detachably connected to the A plate. The air passage insert is used to control the opening or closing of the front mold venting groove.

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