A guide ejection mechanism and mold

Abstract

The utility model discloses a kind of guiding ejection mechanism and mould in injection mould technical field, guiding ejection mechanism is used to guide the sliding of ejector plate relative to mould base.Activity cavity is equipped on mould base, ejector plate is arranged in activity cavity, and with mould base sliding connection, ejector plate moves along demoulding direction relative to mould base.Guiding ejection mechanism includes guide structure, guide structure includes gear and rack that are mutually engaged, rack is parallel to demoulding direction.One of gear and rack is arranged in the inner wall of activity cavity, and the other is arranged in ejector plate.As ejector plate moves along demoulding direction, gear moves along rack relatively.By the mutual cooperation of gear and rack, the sliding friction generated by the plane contact of ejector plate and the inner wall of activity cavity is reduced, the resistance when ejector plate moves along demoulding direction is reduced, so that ejector plate moves more smoothly.

Description

Technical Field

[0001] This utility model belongs to the field of injection mold technology, specifically relating to a guide ejection mechanism and a mold. Background Technology

[0002] Injection molds, also known as injection molds or plastic molds, are metal molds used in injection molding machines, primarily for the mass production of plastic parts. In the automotive manufacturing industry, modern cars, driven by the pursuit of lightweighting, aesthetics, and functionality, extensively utilize plastic parts in their interiors, exteriors, and structural components. Therefore, injection molds have a wide range of applications in the automotive manufacturing sector.

[0003] The ejector plate is a key component in injection molds used to eject plastic parts. Its main function is to smoothly and reliably push the cooled and solidified plastic part out of the mold cavity using ejector pins, thus removing the product and completing one injection molding cycle. In actual use, due to machining errors or assembly clearances in mold components, the ejection direction of the ejector plate may deviate from the product's demolding direction. This causes the ejector plate to frequently deviate from the product's demolding direction as it moves along the ejection direction, resulting in jamming or uneven movement of the ejector plate and causing production delays. Utility Model Content

[0004] The purpose of this utility model is to disclose a guiding ejection mechanism and mold, which can reduce the adverse effects of machining errors or assembly gaps in parts, enable the ejector plate to be ejected smoothly, and improve the processing efficiency of injection molded parts.

[0005] To achieve the above objectives, this utility model discloses a guide ejection mechanism for guiding the ejector plate of a mold to slide relative to the mold base, wherein the mold base is provided with a movable cavity; the ejector plate is disposed in the movable cavity and slidably connected to the mold base, and the ejector plate moves relative to the mold base along the demolding direction; The guide ejection mechanism includes guide structures, and the guide structures are provided on both opposite sides of the ejector plate; each guide structure includes a gear and a rack meshing with the gear, and the rack is parallel to the demolding direction, one of the gear and the rack is provided on the inner wall of the movable cavity, and the other is provided on the ejector plate; as the ejector plate moves along the demolding direction, the gear moves relative to the rack.

[0006] As an optional implementation, the gear is rotatably connected to the mold base; the rack is fixedly connected to the ejector plate.

[0007] As an optional implementation, the guide structure further includes a rotating shaft rotatably mounted on the mold base, the length direction of the rotating shaft being perpendicular to the demolding direction; at least two of the gears are mounted on the rotating shaft, and all the gears are spaced apart along the length direction of the rotating shaft.

[0008] As an optional implementation, the mold base is provided with mounting holes at both ends of the rotating shaft, the end of the rotating shaft is rotatably mounted in the mounting holes, the inner wall of the movable cavity is provided with an inner groove, and the inner groove extends to the mounting hole, and a portion of the gear passes through the inner groove and meshes with the corresponding rack.

[0009] As an optional implementation, the mold base is provided with a clearance groove corresponding to the position of the rack, and when the mold is closed, one end of the rack is located in the clearance groove.

[0010] As an optional implementation, the rack includes a fixed end and an extended end, the fixed end being fixedly connected to the ejector plate, and the extended end being away from the ejector plate; the extended ends of the rack located on opposite sides of the ejector plate have opposite extension directions; the mold base is provided with the clearance groove corresponding to the end of the rack away from the ejector plate.

[0011] As an optional implementation, the rack is fixedly connected to the movable cavity, and the gear is rotatably connected to the ejector plate.

[0012] As an optional implementation, the mold base includes an upper mold plate and a lower mold plate, the upper mold plate and the lower mold plate cooperating to form the movable cavity; a cylinder is provided on the upper mold plate or the lower mold plate, the telescopic end of the cylinder is fixedly connected to the fixed platform on the ejector plate; the telescopic direction of the cylinder is parallel to the demolding direction.

[0013] As an optional implementation, the upper template or the lower template is provided with guide posts, the guide posts are parallel to the demolding direction, and the ejector plate slides through the guide posts.

[0014] Another aspect of this utility model discloses a mold, including the aforementioned guide ejection mechanism, wherein the product is separated from the mold by the guide ejection mechanism.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows: (1) The guide structure is provided on both sides of the ejector plate, so that the force on both sides of the ejector plate is more even, avoiding tilting or jamming caused by uneven force on one side of the ejector plate. This helps the ejector plate move smoothly along the demolding direction.

[0016] (2) The guiding structure includes meshing gears and racks, with the rack parallel to the demolding direction. One of the gears and racks is located on the inner wall of the movable cavity, and the other is located on the ejector plate. As the ejector plate moves along the demolding direction, the gear moves relative to the rack. Through the cooperation of the gears and racks, the sliding friction caused by the contact between the ejector plate and the inner wall of the movable cavity is reduced, thus reducing the resistance when the ejector plate moves along the demolding direction and making the ejector plate move more smoothly. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments 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.

[0018] Figure 1 This is a perspective view of the present invention; Figure 2 This is a front view of the present invention; Figure 3 yes Figure 2 Enlarged view of point A in the middle; Figure 4 This is a structural diagram of the ejector plate of this utility model; Figure 5 yes Figure 4 Enlarged view of point B in the middle; Figure 6 This is a structural diagram of the mold base of this utility model; Figure 7 This is a structural diagram of the template of this utility model; Figure 8 This is a structural diagram of the lower template of this utility model.

[0019] Explanation of key figure labels: 1. Upper template; 11. Cylinder; 2. Download the template; 3. Ejector plate; 31. Rack; 311. Fixed end; 312. Extension end; 32. Fixed platform; 33. Guide post; 34. Ejector pin; 4. Movable cavity; 41. Clearance groove; 42. Inner groove; 5. Gear; 51. Shaft; D1, Demolding direction. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] In this invention, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this invention and its embodiments, and are not intended to limit the indicated device, element, or component to include a specific orientation, or to construct and operate in a specific orientation.

[0022] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this utility model according to the specific circumstances.

[0023] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this utility model based on the specific circumstances.

[0024] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, components, or parts (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, components, or parts. Unless otherwise stated, "a plurality of" means two or more.

[0025] The technical solution of this utility model will be further described below with reference to the embodiments and accompanying drawings.

[0026] Please see Figures 1-3 As shown in the figure, this application embodiment provides a guide ejection mechanism, which is used to guide the ejector plate 3 of the mold to slide relative to the mold base of the mold. The mold base is provided with a movable cavity 4; the ejector plate 3 is disposed in the movable cavity 4 and is slidably connected to the mold base. The ejector plate 3 moves relative to the mold base along the demolding direction D1.

[0027] The ejection mechanism includes guide structures. Guide structures are provided on both sides of the ejector plate 3. Each guide structure includes a gear 5 and a rack 31 that meshes with the gear 5. The rack 31 is parallel to the demolding direction D1. One of the gear 5 and the rack 31 is located on the inner wall of the movable cavity 4, and the other is located on the ejector plate 3. As the ejector plate 3 moves along the demolding direction D1, the gear 5 moves relative to the rack 31.

[0028] The ejector plate 3 has guide structures on both opposite sides, which makes the force on both sides of the ejector plate 3 more even, avoiding tilting or jamming caused by uneven force on one side of the ejector plate 3. This helps the ejector plate 3 move smoothly along the demolding direction D1.

[0029] The interaction between gear 5 and rack 31 reduces the sliding friction caused by the contact between ejector plate 3 and the inner wall plane of movable cavity 4, reduces the resistance when ejector plate 3 moves along demolding direction D1, and makes ejector plate 3 move more smoothly.

[0030] In some embodiments, gear 5 is rotatably connected to the mold base; rack 31 is fixedly connected to ejector plate 3. When ejector plate 3 moves along demolding direction D1, rack 31 moves synchronously with ejector plate 3, at which time gear 5 rotates under the drive of rack 31.

[0031] The mold base is typically fixed, and the gear 5 mounted on it provides excellent stability. The ejector plate 3 moves, driving the rack 31, which meshes with the stable gear 5. This ensures more precise and stable linear movement of the ejector plate 3, reducing wobbling and deviation. The ejection force is transmitted through the ejector plate 3 to the rack 31, and then from the rack 31 to the fixed gear 5, which in turn transmits the force to the mold base. The mold base, acting as a stable support, effectively withstands and distributes force, reducing stress concentration on the ejector plate 3 and other mold components, lowering the risk of damage, and protecting critical components such as the ejector pin 34.

[0032] Please see Figures 7-8 As shown, in some embodiments, the guide structure further includes a rotating shaft 51 rotatably mounted on the mold base, the length direction of the rotating shaft 51 being perpendicular to the demolding direction D1; at least two gears 5 are mounted on the rotating shaft 51, and all gears 5 are spaced apart along the length direction of the rotating shaft 51. Multiple racks 31 mesh with each gear 5 respectively.

[0033] Multiple gears 5 are mounted on the same rotating shaft 51, which makes the guide structure more compact. Within the limited space of the mold's movable cavity 4, multiple transmission pairs can be arranged reasonably without requiring much additional space to install multiple independent gears 5, thus improving the utilization rate of the mold's internal space.

[0034] Multiple gears 5 are distributed on both sides and in the middle of the ejector plate 3, and mesh with corresponding racks 31, which can evenly distribute the ejection force of the ejector plate 3 to each gear 5-rack 31 transmission pair. Compared with a single gear 5 and rack 31, multiple transmission pairs share the ejection force, avoiding the problem of excessive local force, making the force on each part of the ejector plate 3 more uniform, ensuring a smooth ejection process, and reducing the risk of damage to the ejector plate due to uneven force.

[0035] In some embodiments, the mold base has mounting holes at both ends corresponding to the rotating shaft 51, and the ends of the rotating shaft 51 are rotatably mounted in the mounting holes. The inner wall of the movable cavity 4 has an inner groove 42, and the inner groove 42 extends to the mounting hole. A portion of the gear 5 passes through the inner groove 42 and meshes with the rack 31.

[0036] On the one hand, by placing the rotating shaft 51 within the inner groove 42 and the gear 5 part within the inner groove 42, excessive space is avoided by the gear 5 and rotating shaft 51 occupying within the movable cavity 4, thus improving the structural integration of the entire guide ejection mechanism. The guide ejection function is achieved without increasing the overall volume of the mold, thereby improving the utilization rate of mold space.

[0037] On the other hand, the inner groove 42 reduces the possibility of interference between the gear 5 and the shaft 51 and other mold components. The inner groove 42 provides a certain degree of protection for the shaft 51 and the gear 5, reducing the erosion and wear caused by external dust, impurities, etc. The gear 5 and the shaft 51 can maintain a better working condition and extend their service life by operating in the relatively enclosed environment of the inner groove 42.

[0038] Please see Figures 2-3 As shown, a clearance groove 41 is provided on the mold base at the position corresponding to the rack 31. The clearance groove 41 is parallel to the length direction of the rack 31. When the mold is closed, one end of the rack 31 is located in the clearance groove 41.

[0039] When the travel distance of the ejector plate 3 exceeds its length in the demolding direction D1, a longer rack 31 is required to guide the ejector plate 3 to continue moving along the demolding direction D1. During the movement of the ejector plate, the rack 31 moves with it. Without the clearance groove 41, the rack 31 would directly contact the mold base, easily causing damage such as collisions and scrapes. The clearance groove 41 provides a relatively safe movement area for the rack 31, reducing the possibility of rigid collision damage and protecting the integrity of both the rack 31 and the mold base.

[0040] The clearance groove 41 provides a certain guiding function for the rack 31. When the ejector plate 3 drives the rack 31 to perform linear reciprocating motion, the clearance groove 41 provides sufficient linear movement space for the rack 31, preventing the rack 31 from colliding or rubbing against the mold base. This allows the rack 31 to move smoothly along the demolding direction D1, ensuring the smooth ejection and resetting actions of the ejector plate 3 and improving the smoothness of the guiding ejection mechanism's movement.

[0041] Please see Figure 5 As shown, in some embodiments, the rack 31 includes a fixed end 311 and an extended end 312. The fixed end 311 is fixedly connected to the ejector plate 3, and the extended end 312 is away from the ejector plate 3. The extended ends 312 of the rack 31 located on opposite sides of the ejector plate 3 extend in opposite directions. The mold base is provided with a clearance groove 41 at the end of the rack 31 away from the ejector plate 3.

[0042] When the travel of the ejector plate 3 exceeds its length in the demolding direction D1, a longer rack 31 is required to guide the ejector plate 3 to continue moving along the demolding direction D1. If the racks 31 on both sides of the ejector plate 3 are fixedly connected to the ejector plate 3 in the middle and extend away from the ejector plate 3 at both ends, the total length of the racks 31 required to meet the travel requirements of the ejector plate 3 is relatively long; moreover, the mold base needs to open clearance grooves 41 at both ends of each rack 31, which increases the manufacturing cost of the mold.

[0043] If only the extended ends 312 of the racks 31 on opposite sides of the ejector plate 3 extend in opposite directions, the racks 31 on opposite sides of the ejector plate 3 together form a Z-shaped structure with the ejector plate 3. This does not affect the movement of the ejector plate 3 in the demolding direction D1, and at the same time reduces the amount of racks 31 used. Only one end of the rack 31 needs to be provided with a clearance groove 41 on the mold base. This effectively reduces the manufacturing cost of the mold.

[0044] In some embodiments, the rack 31 is fixedly connected to the movable cavity 4, and the gear 5 is rotatably connected to the ejector plate 3. In this case, the length of the rack 31 is the same as the length of the movable cavity 4 in the demolding direction D1, eliminating the need for a clearance groove 41 on the mold base and reducing the manufacturing cost of the mold base. While the gear 5 moves along the demolding direction D1 with the ejector plate 3, it rotates under the action of the rack 31.

[0045] As the ejector plate 3 moves along the demolding direction D1, the ejection force on the ejector plate 3 is transmitted to the rack 31 through the gear 5 connected to it. Since the rack 31 is fixed on the movable cavity 4, it can provide stable support and reaction force for the gear 5, allowing the ejection force to be more reasonably distributed and balanced throughout the system. The gear 5 rotates under the action of the rack 31, and its motion trajectory is strictly limited by the rack 31, ensuring the stability and accuracy of the motion.

[0046] Please see Figures 6 to 8 As shown, the mold base includes an upper template 1 and a lower template 2, which cooperate to form a movable cavity 4. Dividing the mold base into upper template 1 and lower template 2 for separate processing reduces the difficulty and complexity of the machining process. When a part of the mold base is severely damaged, causing it to malfunction, only the severely damaged part of the upper template 1 or lower template 2 needs to be replaced, eliminating the need to replace the entire mold base and reducing the cost of mold use.

[0047] A cylinder 11 is installed on either the upper mold plate 1 or the lower mold plate 2. The telescopic end of the cylinder 11 is fixedly connected to the fixed platform 32 on the ejector plate 3. The telescopic direction of the cylinder 11 is parallel to the demolding direction D1. The cylinder 11 serves as a power source, and its telescopic action provides sufficient direct ejection power to the ejector plate 3. After the mold opens, by controlling the extension of the telescopic end of the cylinder 11, the ejector plate 3 is pushed to move along the demolding direction D1, and the ejector pins 34 on the ejector plate 3 eject the molded product from the mold. The telescopic end of the cylinder 11 is fixedly connected to the fixed platform 32 on the ejector plate 3, and the force transmission path of the cylinder 11 is direct and clear. This effectively transmits the power of the cylinder 11 to the ejector plate 3, reducing force loss and instability during transmission, and ensuring the reliability and stability of the ejection action.

[0048] Please see Figure 8 As shown, in some embodiments, the upper template 1 or the lower template 2 is provided with guide posts 33, the guide posts 33 are parallel to the demolding direction D1, and the ejector plate 3 slides through the guide posts 33.

[0049] During the ejection process, the ejector plate 3 is subjected to various forces, such as ejection force and product reaction force, which may cause vibration and shaking of the ejector plate 3. The guide pillar 33 provides precise guidance for the ejection movement of the ejector plate 3 along the demolding direction D1. During the ejection process, the ejector plate 3 needs to move accurately along the demolding direction D1 to ensure that the product can be smoothly and accurately ejected from the mold. The guide pillar 33 avoids large offsets, shaking, or rotation of the ejector plate 3 during movement, ensuring the accuracy of the ejection direction and improving the precision of the ejection movement.

[0050] Guide pillars 33 help disperse the force on the ejector plate 3 as it moves along the demolding direction D1. When the ejector plate 3 is subjected to ejection force, guide pillars 33 can bear part of the lateral force, reducing the local stress on the ejector plate 3 and other parts of the mold base, and preventing damage to components due to excessive local stress. By evenly distributing the force, the overall load-bearing capacity of the mold structure is improved, and the service life of the mold is extended.

[0051] The guide pillar 33 enhances the structural strength of the mold in the ejection direction. Together with the upper mold plate 1, the lower mold plate 2, and the ejector plate 3, it forms a stable structural system that can better resist various forces generated during the ejection process, ensuring the structural integrity and stability of the mold during long-term use.

[0052] The guide post 33 provides a clear reference for the installation and positioning of the ejector plate 3. During mold assembly, the ejector plate 3 can be accurately positioned and installed using the guide post 33, ensuring the correct relative position of the ejector plate 3 with other mold components, simplifying the assembly process and improving assembly efficiency.

[0053] In some embodiments, this utility model discloses a mold including the aforementioned guide ejection mechanism, through which the product is separated from the mold. The guide ejection mechanism provides stable power and motion guidance for the mold. This stable motion helps to quickly and smoothly eject the product from the mold, effectively improving work efficiency.

[0054] The technical means disclosed in this utility model are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications are also considered within the scope of protection of this utility model.

Claims

1. A guide ejection mechanism, characterized in that, It is used to guide the ejector plate of the mold to slide relative to the mold base, the mold base having a movable cavity; the ejector plate is located in the movable cavity and is slidably connected to the mold base, and the ejector plate moves relative to the mold base along the demolding direction; The guide ejection mechanism includes guide structures, which are provided on both sides of the ejector plate. Each guide structure includes a gear and a rack meshing with the gear, and the rack is parallel to the demolding direction. One of the gear and the rack is located on the inner wall of the movable cavity, and the other is located on the ejector plate. As the ejector plate moves along the demolding direction, the gear moves relative to the rack.

2. The guide ejection mechanism according to claim 1, characterized in that, The gear is rotatably connected to the mold base; the rack is fixedly connected to the ejector plate.

3. The guide ejection mechanism according to claim 1 or 2, characterized in that, The guide structure further includes a rotating shaft rotatably mounted on the mold base, the length direction of the rotating shaft being perpendicular to the demolding direction; at least two of the gears are mounted on the rotating shaft, and all the gears are spaced apart along the length direction of the rotating shaft.

4. The guide ejection mechanism according to claim 3, characterized in that, The mold base has mounting holes at both ends corresponding to the rotating shaft. The ends of the rotating shaft are rotatably mounted in the mounting holes. The inner wall of the movable cavity has an inner groove that extends to the mounting holes. A portion of the gear passes through the inner groove and meshes with the corresponding rack.

5. The guide ejection mechanism according to claim 1, characterized in that, The mold base is provided with a clearance groove corresponding to the position of the rack. When the mold is closed, one end of the rack is located in the clearance groove.

6. The guide ejection mechanism according to claim 5, characterized in that, The rack includes a fixed end and an extended end. The fixed end is fixedly connected to the ejector plate, and the extended end is away from the ejector plate. The extended ends of the rack located on opposite sides of the ejector plate extend in opposite directions. The mold base is provided with the clearance groove corresponding to the end of the rack away from the ejector plate.

7. The guide ejection mechanism according to claim 1, characterized in that, The rack is fixedly connected to the movable cavity, and the gear is rotatably connected to the ejector plate.

8. The guide ejection mechanism according to any one of claims 1-7, characterized in that, The mold base includes an upper mold plate and a lower mold plate, the upper mold plate and the lower mold plate cooperate to form the movable cavity; a cylinder is provided on the upper mold plate or the lower mold plate, the telescopic end of the cylinder is fixedly connected to the fixed platform on the ejector plate; the telescopic direction of the cylinder is parallel to the demolding direction.

9. The guide ejection mechanism according to claim 8, characterized in that, The upper or lower template is provided with guide posts, which are parallel to the demolding direction, and the ejector plate slides through the guide posts.

10. A mold, characterized in that, The mold includes a guide ejection mechanism as described in any one of claims 1-9, through which the product is separated from the mold.

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