A slanted ejection mechanism of an injection mold

Abstract

This application discloses a slanted ejector mechanism for an injection mold, including a lower mold, a first slanted ejector rod, a second slanted ejector rod, and a driving mechanism. The first slanted ejector rod is slidably disposed within the lower mold, with its top end serving as a first undercut for the bottom of the product. The second slanted ejector rod is slidably disposed within the lower mold, with its top end serving as a second undercut for the bottom of the product. The second undercut is positioned opposite to the first undercut. The driving mechanism is disposed within the lower mold. The bottom ends of both the first and second slanted ejector rods are connected to the output end of the driving mechanism. The driving mechanism is adapted to allow the bottom ends of the first and second slanted ejector rods to be spaced apart. The advantages of this application are: the driving mechanism ensures that the two slanted ejector rods can move slantedly for demolding, and also allows the bottom ends of the two slanted ejector rods to be spaced apart, thereby achieving demolding of the two opposing undercuts. Furthermore, it effectively solves the installation interference problem caused by the cross-design of the bottom ends of the two slanted ejector rods in traditional slanted ejector mechanisms.

Description

Technical Field

[0001] This application relates to the field of mold technology, and in particular to a slanted ejector mechanism for an injection mold. Background Technology

[0002] Injection molds are tools used to produce plastic products, giving them a complete structure and precise dimensions. Injection molding is a processing method used for the mass production of certain complex-shaped parts. Specifically, it involves injecting molten plastic into a mold cavity under high pressure using an injection molding machine, where it is then cooled and solidified to obtain the molded product.

[0003] like Figure 1 As shown, the bottom of its injection-molded product 1 has two oppositely arranged undercuts, that is, the opening directions of the two undercuts are opposite, namely the first undercut 101 and the second undercut 102. The undercuts are generally demolded using a slanted ejector mechanism, such as... Figure 2 As shown, if a pair of traditional inclined ejector mechanisms are used, the bottom ends of the two inclined ejector rods will be designed in a cross shape, meaning that the mounting structure of the two inclined ejector rods on the ejector plate will interfere. Furthermore, if a pair of hydraulic cylinders are used to drive the inclined ejector rods for demolding, there will be insufficient mounting space within the mold. Therefore, how to improve the existing inclined ejector demolding mechanism to overcome the above problems is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0004] One of the objectives of this application is to provide a slanted ejector mechanism for injection molds.

[0005] To achieve the above objectives, the technical solution adopted in this application is as follows: a slanted ejector mechanism for an injection mold, comprising a lower mold, a first slanted ejector rod, a second slanted ejector rod, and a driving mechanism. The first slanted ejector rod is slidably disposed within the lower mold, and its top end is used to form a first undercut at the bottom of the product. The second slanted ejector rod is slidably disposed within the lower mold, and its top end is used to form a second undercut at the bottom of the product. The second undercut is disposed close to the first undercut. The driving mechanism is disposed within the lower mold. The bottom ends of both the first and second slanted ejector rods are connected to the output end of the driving mechanism. The driving mechanism is adapted to ensure that the mounting points of the bottom ends of the first and second slanted ejector rods are spaced apart. The driving mechanism is adapted to drive the first and second slanted ejector rods to slide slanted synchronously, thereby achieving the demolding of the first and second undercuts at the bottom of the product.

[0006] Preferably, the driving mechanism includes an ejector plate and a support base. The ejector plate is vertically slidably installed in the lower mold, and the support base is installed on the top of the ejector plate. The bottom end of the first inclined ejector rod is movably engaged with the top of the support base, and the bottom end of the second inclined ejector rod is movably engaged with the top of the ejector plate, so that the bottom ends of the first inclined ejector rod and the second inclined ejector rod are spaced vertically apart.

[0007] Preferably, the lower mold is provided with a clearance groove, which is located directly above the support base and cooperates with the support base.

[0008] Preferably, both the support base and the top of the ejector plate are provided with slide rails, and a slider is slidably arranged in the slide rails. A cylinder body is rotatably installed on the side of the slider body. The bottom ends of the first and second inclined ejector rods are connected to the corresponding cylinder body. A cylinder body is also rotatably installed on the side of the slider body. A guide rod 1 and a guide rod 2 are respectively installed in the lower mold. The guide rod 1 and the guide rod 2 are sleeved with the corresponding cylinder body. The guide rod 1 is parallel to the first inclined ejector rod, and the guide rod 2 is parallel to the second inclined ejector rod.

[0009] Preferably, the lower mold has detachable locking pins installed at both ends of the guide rod 1 and the guide rod 2, and both ends of the guide rod 1 and the guide rod 2 are provided with locking grooves that cooperate with the locking pins, and both the guide rod 1 and the guide rod 2 penetrate the ejector plate.

[0010] Preferably, the driving mechanism includes an ejector plate and a support base. The ejector plate is vertically slidably installed inside the lower mold, and the support base is installed on the top of the ejector plate. The bottom ends of the first inclined ejector rod and the second inclined ejector rod are movably engaged with the top of the support base, so that the bottom ends of the first inclined ejector rod and the second inclined ejector rod are spaced apart from each other.

[0011] Preferably, the lower mold is provided with a clearance groove, and the support base is vertically slidingly engaged with the clearance groove; both sides of the top of the support base are provided with slide rails, and a slider is slidably disposed in the slide rails. A cylinder is rotatably mounted on the side of the slider, and the bottom ends of the first inclined push rod and the second inclined push rod are connected to the corresponding cylinder.

[0012] Preferably, the driving mechanism includes a pair of driving cylinders, a driving device and a transmission assembly installed in the lower mold. The driving cylinders are rotatably installed in the lower mold and are threadedly engaged with the corresponding first and second inclined ejector rods. The output end of the driving device is connected to the input end of the transmission assembly, and the output end of the transmission assembly is engaged with the driving cylinders, so that the bottom ends of the first and second inclined ejector rods are spaced apart from each other. When the mold is opened, the driving device is adapted to drive the two driving cylinders to rotate synchronously through the transmission assembly, so that the first and second inclined ejector rods slide obliquely to demold.

[0013] Preferably, the transmission assembly includes a first bevel gear and a pair of second bevel gears. The first bevel gear is installed at the output end of the drive device, and the second bevel gear is sleeved on the corresponding drive cylinder. The second bevel gear is located on both sides of the first bevel gear and meshes with the first bevel gear.

[0014] Preferably, the driving mechanism further includes a lead screw and an ejector plate, the ejector plate being vertically slidably installed in the lower mold, the lead screw being installed at the output end of the driving device and cooperating with the ejector plate; during mold opening, the driving device is adapted to drive the ejector plate upward by means of the lead screw.

[0015] Compared with the prior art, the beneficial effects of this application are as follows: This invention, by incorporating a driving mechanism, ensures that the first and second inclined ejector rods can move at an angle for demolding, while also allowing the bottom ends of the two inclined ejector rods to be spaced apart. In other words, the two inclined ejector rods are installed as an independent module, without interfering with each other, thereby achieving demolding between the two opposing undercuts. This effectively solves the installation interference problem caused by the cross design of the bottom ends of the two inclined ejector rods in traditional inclined ejector mechanisms. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the existing product structure.

[0017] Figure 2 This is a schematic diagram of an existing inclined plane mechanism.

[0018] Figure 3 This is a schematic diagram of the overall structure of Embodiment 1 of the present invention.

[0019] Figure 4 This is a schematic diagram of the oblique three-dimensional structure in Embodiment 1 of the present invention.

[0020] Figure 5 This is a schematic diagram of the mold closing process in Embodiment 1 of the present invention.

[0021] Figure 6This is a schematic diagram illustrating the principle of mold closing in Embodiment 1 of the present invention.

[0022] Figure 7 This is a schematic diagram of the guide rod installation structure in Embodiment 1 of the present invention.

[0023] Figure 8 This is a schematic diagram of the overall structure of Embodiment 2 of the present invention.

[0024] Figure 9 This is a schematic diagram of the overall structure of Embodiment 3 of the present invention.

[0025] Figure 10 This is a schematic diagram of the transmission component structure of the present invention.

[0026] In the diagram: 1. Product; 101. First undercut; 102. Second undercut; 2. Lower mold; 3. First inclined ejector pin; 4. Second inclined ejector pin; 5. Drive mechanism; 501. Ejector plate; 502. Support base; 503. Drive cylinder; 504. Drive device; 505. Transmission assembly; 5051. Bevel gear one; 5052. Bevel gear two; 506. Lead screw; 6. Guide rod one; 7. Guide rod two; 8. Slide rail; 9. Cylinder one; 10. Cylinder two; 11. Clearance groove; 12. Locking post; 13. Locking slot. Detailed Implementation

[0027] The present application will be further described below with reference to specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0028] In the description of this application, it should be noted that the terms "center", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., which indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and should not be construed as limiting the specific protection scope of this application.

[0029] It should be noted that the terms "first," "second," etc., in the specification and claims of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0030] One preferred embodiment of this application, such as Figures 1 to 10As shown, a slanted ejector mechanism for an injection mold includes a mold body, a first slanted ejector rod 3, a second slanted ejector rod 4, and a driving mechanism 5. The mold body includes an upper mold (not shown) and a lower mold 2. The first slanted ejector rod 3 is slidably disposed within the lower mold 2, and its top end is used to form a first undercut 101 at the bottom of the product 1. The second slanted ejector rod 4 is slidably disposed within the lower mold 2, and its top end is used to form a second undercut 102 at the bottom of the product 1. The second undercut 102 and the first undercut 101 are disposed relatively close to each other. The driving mechanism 5 is disposed within the lower mold 2. The bottom ends of the first slanted ejector rod 3 and the second slanted ejector rod 4 are both connected to the output end of the driving mechanism 5, and the mounting points of the bottom ends of the first slanted ejector rod 3 and the second slanted ejector rod 4 are spaced apart.

[0031] Understandably, by setting up the drive mechanism 5, it can ensure that the first inclined ejector rod 3 and the second inclined ejector rod 4 can move tilted to demold, while also allowing the bottom ends of the two inclined ejector rods to be spaced apart. That is, the two inclined ejector rods are installed as an independent module and will not interfere with each other, thereby realizing demolding between the two opposite undercuts. This effectively solves the installation interference problem caused by the cross design of the bottom ends of the two inclined ejector rods in the traditional inclined ejector mechanism, and also avoids the problem of insufficient installation space caused by using multiple drive sources (i.e., a pair of hydraulic cylinders) installed in the lower mold 2.

[0032] This application does not specifically limit the drive mechanism 5 or the way the intervals are set. The following three embodiments are provided for reference: Example 1 like Figure 3 As shown, the drive mechanism 5 includes an ejector plate 501 and a support base 502. The ejector plate 501 is vertically slidably installed in the lower mold 2, and the support base 502 is installed at the top of the ejector plate 501. The bottom end of the first inclined ejector rod 3 is movably engaged with the top end of the support base 502, and the bottom end of the second inclined ejector rod 4 is movably engaged with the top end of the ejector plate 501. That is, the bottom end of the first inclined ejector rod 3 is higher than the bottom end of the second inclined ejector rod 4, so that the bottom ends of the two inclined ejector rods are spaced vertically apart.

[0033] Specifically, such as Figure 4 As shown, due to the elevation effect of the support base 502, the first inclined ejector rod 3 will be installed at a higher position than the second inclined ejector rod 4. Therefore, the two will be staggered in space on the ejector plate 501, so that the installation structure between the bottom ends of the two will not interfere with the installation, thereby realizing the demolding of the two relatively undercut rods.

[0034] Further preferably, a clearance groove 11 can be provided in the lower mold 2, and the clearance groove 11 is located directly above the support base 502 and cooperates with the support base 502. It is understood that when the ejector plate 501 moves upward for demolding, the support base 502 will also move upward and enter the clearance groove 11. That is, the clearance groove 11 provides sliding space for the support base 502, ensuring that the support base 502 can move smoothly up and down without being obstructed by other structures within the lower mold 2. On the other hand, the clearance groove 11 can guide the movement of the support base 502, causing the support base 502 to move along a predetermined trajectory and preventing the support base 502 from deviating during movement.

[0035] It should be noted that in existing technologies, such as Figure 3 As shown, a mounting groove is provided in the lower mold 2. This mounting groove is to provide clearance for the vertical sliding of the ejector plate 501. Of course, the height of this mounting groove is also relatively small. The support seat 502 is located at the top of the ejector plate 501, which requires the height of the mounting groove to be set high enough to allow the support seat 502 to move. A clearance groove 11 is provided in the lower mold 2 at the position corresponding to the support seat 502. This clearance groove 11 is designed to accommodate the movement of the support seat 502. This eliminates the need to set an additional height for the mounting groove, thus avoiding any additional increase in the overall height of the mold and promoting a more compact design of the overall mold structure.

[0036] As a further description of the above embodiments: such as Figure 4 As shown, a slide rail 8 is provided at the top of both the support base 502 and the ejector plate 501. A slider is slidably arranged in the slide rail 8. A cylinder 9 is rotatably installed on the side of the slider. The bottom ends of the first inclined ejector rod 3 and the second inclined ejector rod 4 are connected to the corresponding cylinder 9, which is the movable connection between the inclined ejector rod and the ejector plate 501.

[0037] Furthermore, a second cylinder 10 is rotatably mounted on the side of the slider, and a guide rod 6 and a guide rod 7 are respectively installed in the lower mold 2. The guide rod 6 and the guide rod 7 are sleeved with the corresponding cylinder 10. The guide rod 6 is parallel to the first inclined ejector rod 3, and the guide rod 7 is parallel to the second inclined ejector rod 4.

[0038] Understandably, the original inclined ejector rod relied entirely on the inclined hole in the lower mold 2 for guidance during demolding. The ejector rod primarily bore the clamping force (axial force) from product 1 and the lateral force generated by the angle. Its weak point was located at the bottom slider; over time, the inclined hole was prone to wear, leading to increased clearance and the risk of wobbling, jamming, or even breakage. However, by using two fixed guide rods (guide rod 6 and guide rod 7), the guide rods position and guide the slider, essentially providing a "track" for the inclined ejector rod. This significantly enhances the bending and torsional strength of the entire inclined ejector mechanism, reduces the bending moment acting on the root of the ejector block, and extends its service life.

[0039] Further optimization involves the following specific installation method for the guide rod: (e.g.) Figure 7 As shown, retaining posts 12 are detachably installed at both ends of guide rod 6 and guide rod 7 within the lower mold 2. Retaining slots 13 are provided at both ends of guide rod 6 and guide rod 7. During installation, guide rod 6 and guide rod 7 can be inserted from the bottom of the lower mold 2, passing through the ejector plate 501 and abutting against the upper retaining post 12 via the retaining slots 13. After insertion, the lower retaining post 12 is installed, engaging with the retaining slots 13 at the bottom of guide rod 6 and guide rod 7 to complete the installation. Conversely, during disassembly, simply remove the lower retaining post 12, then pull out guide rod 6 and guide rod 7 from the bottom. This process is simple and convenient.

[0040] Example 2 like Figure 8 As shown, the drive mechanism 5 includes an ejector plate 501 and a support base 502. The ejector plate 501 is vertically slidably installed in the lower mold 2, and the support base 502 is installed on the top of the ejector plate 501. The bottom ends of the first inclined ejector rod 3 and the second inclined ejector rod 4 are movably engaged with the top of the support base 502, so that the bottom ends of the first inclined ejector rod 3 and the second inclined ejector rod 4 are spaced apart from each other on the left and right.

[0041] Specifically, slide rails 8 are provided on both sides of the top of the support base 502. A slider is slidably mounted within the slide rail 8, and a cylinder 9 is rotatably mounted on the side of the slider. The bottom ends of the first inclined ejector rod 3 and the second inclined ejector rod 4 are connected to the corresponding cylinder 9. It can be understood that during demolding, the support base 502 moves upward under the action of the ejector plate 501, thereby causing the two inclined ejector rods to slide at an angle. That is, the slider moves along the slide rail 8, and the cylinder 9 rotates on the slider, thereby realizing the inclined demolding action of the first inclined ejector rod 3 and the second inclined ejector rod 4.

[0042] It should be noted that this installation method raises the bottom installation position of both inclined push rods, thus reducing the overall length of the two inclined push rods. This avoids interference problems caused by the two inclined push rods being too long and their bottom ends being intersected.

[0043] Further optimization, such as Figure 8 As shown, a clearance groove 11 can be provided in the lower mold 2, and the support base 502 slides vertically with the clearance groove 11. It has the same effect as the clearance groove 11 in the first embodiment above, that is, to provide clearance space for the support base 502 and to play a limiting and guiding role, thereby improving stability.

[0044] Example 3 like Figure 9 and Figure 10 As shown, the drive mechanism 5 includes a pair of drive cylinders 503, a drive device 504 installed in the lower mold 2, and a transmission assembly 505. The drive cylinders 503 are rotatably installed in the lower mold 2 and are threadedly engaged with the corresponding first inclined ejector rod 3 and second inclined ejector rod 4. The output end of the drive device 504 is connected to the input end of the transmission assembly 505, and the output end of the transmission assembly 505 is engaged with the drive cylinders 503. After installation, the bottom ends of the first inclined ejector rod 3 and the second inclined ejector rod 4 are spaced apart from each other.

[0045] It is understandable that during mold opening, the drive device 504 drives the two drive cylinders 503 to rotate synchronously through the transmission component 505. The drive cylinders 503 act on the corresponding inclined ejector rods, thereby enabling the two inclined ejector rods to tilt and slide upward synchronously to achieve the demolding effect.

[0046] It should be noted that the drive device 504 is common knowledge known to those skilled in the art and can be a motor, rotary cylinder, or rotary hydraulic cylinder, etc. In this embodiment, only one drive source (drive device 504) is needed to realize the simultaneous movement of a pair of inclined ejector rods, which greatly saves the installation space in the mold and also reduces costs.

[0047] This application does not specifically limit the structure of the transmission assembly 505, but the following specific embodiment is provided for reference: Figure 10 As shown, the transmission assembly 505 includes a first bevel gear 5051 and a pair of second bevel gears 5052. The first bevel gear 5051 is installed at the output end of the drive device 504, and the second bevel gear 5052 is sleeved and installed on the corresponding drive cylinder 503. The second bevel gear 5052 is located on both sides of the first bevel gear 5051 and meshes with the first bevel gear 5051.

[0048] Understandably, during demolding, the drive device 504 drives the first bevel gear 5051 to rotate, the first bevel gear 5051 acts on the two second bevel gears 5052 to rotate, and the second bevel gears 5052 drive the two drive cylinders 503 to rotate synchronously. Thus, the two inclined ejector rods can be used for synchronous tilting and sliding demolding through threaded engagement.

[0049] Further optimization, such as Figure 9 As shown, the drive mechanism 5 also includes a lead screw 506 and an ejector plate 501. The ejector plate 501 is vertically slidably installed in the lower mold 2, and the lead screw 506 is installed at the output end of the drive device 504 and cooperates with the ejector plate 501.

[0050] Understandably, during mold opening, the drive device 504, while driving the inclined ejector rod for demolding, also drives the lead screw 506 to rotate. This, in turn, causes the ejector plate 501 to move upwards via the lead screw 506, allowing the ejector pins on the ejector plate 501 to eject the product 1. It should be noted that in existing technologies, the ejector plate 501 is also driven by a hydraulic cylinder for vertical movement. However, in this application, the same drive device 504 can achieve both the movement of the ejector plate 501 and the tilting demolding action of the inclined ejector rod. This not only simplifies the mold structure but also further saves installation space within the mold and reduces manufacturing costs. Furthermore, the way the lead screw 506 and the ejector plate 501 work together allows for precise control of the movement distance of the ejector plate 501. The lead screw 506 and the ejector plate 501, as well as the drive cylinder 503 and its corresponding angled ejector rod, are all connected by threads. These threaded connections are self-locking, meaning that even if the drive unit 504 malfunctions, each component can remain stable in its current position, ensuring the reliability and stability of the demolding and mold closing processes. This design also avoids synchronization problems that might arise from using multiple drive sources, improving the overall operating efficiency of the demolding mechanism.

[0051] Finally, it should be noted that Embodiment 1 is similar to Embodiment 2. Both use the ejector plate 501 as the driving source and then elevate and offset the installation positions of the corresponding inclined ejector rods through the support base 502 to achieve an interval layout at the bottom ends of the two inclined ejector rods, thereby avoiding installation interference. Furthermore, a large clearance groove 11 is required inside the lower mold 2 to provide movement space and guidance for the support base 502. Embodiment 3, however, adopts a completely different driving method. Both inclined ejector rods are installed inside the lower mold 2 without needing to connect with the ejector plate 501. Both are directly driven by the cooperation of the driving device 504 and the transmission component 505. This reduces the large friction between the traditional inclined ejector rods and the inclined holes of the lower mold 2 during demolding, resulting in smoother and more stable movement of the inclined ejector rods and greatly extending their service life. Moreover, using one driving source (driving device 504) can realize the movement of both inclined ejector rods and the ejector plate 501, and the installation space inside the lower mold 2 is fully optimized. Of course, all three embodiments can meet the demolding requirements of relatively inverted designs, and those skilled in the art can choose according to the actual situation.

[0052] The basic principles, main features, and advantages of this application have been described above. Those skilled in the art should understand that this application is not limited to the above embodiments. The embodiments and descriptions in the specification are merely the principles of this application. Various changes and modifications can be made to this application without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection claimed by this application is defined by the appended claims and their equivalents.

Claims

1. A sloping ejector demolding mechanism of an injection mold, characterized by, include: Lower mold; The first inclined ejector rod is inclined and slidably disposed in the lower mold and its top end is used to form the first undercut at the bottom of the product. The second inclined ejector rod is inclined and slidably disposed in the lower mold and its top end is used to form the second undercut at the bottom of the product. The second undercut is disposed close to the first undercut. as well as A driving mechanism is provided inside the lower mold. The bottom ends of the first and second inclined ejector rods are connected to the output end of the driving mechanism. The driving mechanism is adapted to make the mounting points of the bottom ends of the first and second inclined ejector rods spaced apart. The driving mechanism is adapted to drive the first and second inclined ejector rods to tilt and slide synchronously, thereby realizing the demolding of the first and second undercuts at the bottom of the product. The driving mechanism includes a pair of driving cylinders, a driving device and a transmission assembly installed in the lower mold. The driving cylinders are rotatably installed in the lower mold and are threadedly engaged with the corresponding first and second inclined ejector rods. The output end of the driving device is connected to the input end of the transmission assembly, and the output end of the transmission assembly is engaged with the driving cylinders, so that the bottom ends of the first and second inclined ejector rods are spaced apart from each other. When the mold is opened, the driving device is adapted to drive the two driving cylinders to rotate synchronously through the transmission assembly, so that the first and second inclined ejector rods slide and demold at an angle. The transmission assembly includes a first bevel gear and a pair of second bevel gears. The first bevel gear is installed at the output end of the drive device, and the second bevel gears are sleeved and installed on the corresponding drive cylinder. The second bevel gears are located on both sides of the first bevel gear and mesh with the first bevel gear. The driving mechanism further includes a lead screw and an ejector plate. The ejector plate is vertically slidably installed in the lower mold. The lead screw is installed at the output end of the driving device and cooperates with the ejector plate. When the mold is opened, the driving device is adapted to drive the first inclined ejector rod and the second inclined ejector rod to slide and disengage from the mold through the transmission assembly. At the same time, the driving device is also adapted to drive the ejector plate to move upward through the lead screw, so that the ejector pins on the ejector plate eject the molded product.

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