High-rigidity low-deformation movable mold plate and injection molding machine thereof

Abstract

The application discloses a high-rigidity and low-deformation movable mold plate, which is especially used on a mold closing mechanism of a two-plate injection molding machine. The inside of the movable mold plate body is provided with a composite connecting arm for transmitting a mold locking force, and the composite connecting arm comprises a circular ring reinforcing rib, a cable-stayed reinforcing rib, an arch bridge reinforcing rib, a column reinforcing rib and a connecting rib. The conduction and distribution of the high-pressure mold locking force in the movable mold plate are more uniform, and through the matched connection among the cable-stayed reinforcing rib, the arch bridge reinforcing rib and the column reinforcing rib, the strength and rigidity of the movable mold plate are significantly increased. In the mold locking process, the mold is uniformly stressed in each direction, and is uniformly deformed, so that the product waste rate can be reduced. Meanwhile, the deformation of the movable mold plate caused by the mold reaction force is greatly reduced, and the deformation of the movable mold plate generated in the mold locking process can be well resisted. In this way, the service life of the movable mold plate of the injection molding machine is increased, and the stability of the injection quality is significantly improved.

Description

Technical Field

[0001] This invention relates to the field of injection molding equipment, and more specifically to a high-rigidity, low-deformation moving template, and an injection molding machine including such a moving template. Background Technology

[0002] Two-platen injection molding machines utilize a combination of moving and fixed platen templates, applying clamping force directly to the two platen templates of the fixed mold. The clamping mechanism of a two-platen injection molding machine mainly consists of a fixed platen, moving platen, clamping cylinder, tie rod, brake mechanism, and mold opening / closing mechanism. During clamping, the mold opening / closing mechanism drives the moving platen to slide along the tie rod, causing the moving platen to press tightly against the fixed platen, thus achieving mold closing. The brake mechanism then engages, causing the moving platen to grip the tie rod, preventing further sliding. The clamping cylinder pushes the moving platen, tightly closing the moving and fixed platen templates, clamping the mold, and applying high-pressure clamping force.

[0003] Since the four clamping cylinders are fixed at the four corners of the moving template, and the mold mounting surface of the moving template is at the center of the moving template, during the clamping process, the four clamping cylinders output high-pressure clamping force to the four corners of the moving template respectively. The clamping force will start from the four corners of the moving template, pass through the mold mounting surface at the center of the moving template, and finally be transmitted to the mold.

[0004] Traditional moving mold plates typically employ a cross-section with a star-shaped (*-shaped) reinforced structure to accurately transmit clamping force and ensure the connection strength from the four corners to the center. During high-pressure clamping, the moving mold plate is also subjected to the reaction force of the mold and the tension exerted by the four tie rods at its corners, causing deformation. This deformation leads to uneven stress on the mold, affecting the injection molding quality. In actual production, existing moving mold plates are unable to effectively resist this deformation, resulting in a generally short lifespan and inconsistent injection molding quality. Summary of the Invention

[0005] To overcome the shortcomings of the prior art, one objective of the present invention is to provide a high-rigidity, low-deformation moving template, and another objective is to provide an injection molding machine including such a moving template, which can solve the problem that the moving template of the existing injection molding machine is prone to deformation during high-pressure clamping.

[0006] This invention is achieved using the following technical solution:

[0007] The utility model provides a high rigidity low deformation movable die plate, including movable die plate main part, one side of movable die plate main part is equipped with a mould installation surface, the four corner positions of movable die plate main part are equipped with the pull rod through -hole for passing the pull rod respectively, the center position is equipped with a center cooperation hole, the inside of movable die plate main part is provided with the composite connecting arm for transmitting the locking force, the composite connecting arm includes: circular ring reinforcing rib, diagonal bracing reinforcing rib, arch bridge reinforcing rib and stand reinforcing rib, the outer periphery of the center cooperation hole is provided with the circular ring reinforcing rib around, the two ends of diagonal bracing reinforcing rib are connected to pull rod through -hole and circular ring reinforcing rib respectively, the number of diagonal bracing reinforcing rib is four, and it is cross -type distribution, the arch bridge reinforcing rib is circular arch, and its two ends are connected to two pull rod through -hole of the same side respectively, the arch bridge reinforcing rib is connected to circular ring reinforcing rib through a connecting rib, one end of connecting rib is connected to the top of circular arch of arch bridge reinforcing rib, one end of stand reinforcing rib is connected to the bottom of circular arch of arch bridge reinforcing rib, and the other end extends to the side of movable die plate.

[0008] Further, the movable die plate main body is also provided with two pinhole bosses, the pinhole bosses are provided with pin arrangement holes, which are first pin arrangement hole and second pin arrangement hole; the first pin arrangement hole and the second pin arrangement hole are arranged on the two opposite sides of the circular ring reinforcing rib; the pin arrangement hole penetrates the mold installation surface.

[0009] Further, one end of the connecting rib located on both sides of the pin arrangement hole is connected to the top of the circular arch of the arch bridge reinforcing, and the other end is connected to the pinhole boss.

[0010] Further, the bottom of each arch bridge reinforcing rib is connected with three stand reinforcing ribs, and the stand reinforcing ribs are evenly spaced.

[0011] Further, the movable die plate main body is also recessed with a first groove, and the diagonal bracing reinforcing rib, the arch bridge reinforcing rib, the connecting rib and the pinhole boss are enclosed in the first groove.

[0012] Further, the movable die plate main body is also recessed with a second groove, and the arch bridge reinforcing rib, the stand reinforcing rib and the side of the movable die plate main body are enclosed in the second groove.

[0013] Further, a plurality of notches are arranged on the arch bridge reinforcing rib, and the notches are respectively connected to the first groove and the second groove.

[0014] Further, two notches are arranged on the arch bridge reinforcing rib, and the notches are located between two adjacent stand reinforcing ribs.

[0015] Further, the bottom surface of the movable die plate body is further provided with a foot pad, and a blind hole is formed in the foot pad.

[0016] An injection molding machine comprises the high-rigidity and low-deformation movable die plate.

[0017] Compared with the prior art, the present application has the following beneficial effects:

[0018] The pull rod through holes at the four corners of the movable die plate body are respectively arranged on the four pull rods, and the mold mounting surface at the center of the movable die plate body is used for fixing the mold.

[0019] During the clamping, the clamping oil cylinders arranged at the four corners of the movable die plate output high-pressure clamping force at the four corner positions of the movable die plate, and the high-pressure clamping force is transmitted to the mold mounting surface through the composite connecting arm structure from the pull rod through holes. During the force transmission, ① the high-pressure clamping force is transmitted to the circular ring reinforcing rib from the pull rod through hole through the inclined pull reinforcing rib, and then to the mold mounting surface; ② at the same time, the high-pressure clamping force is also transmitted to the circular ring reinforcing rib through the arch bridge reinforcing rib and the connecting rib, and then to the mold mounting surface. The column reinforcing rib is used for increasing the strength of the arch bridge reinforcing rib. ③ The same arch bridge reinforcing rib can conduct and distribute the force of the two pull rod through holes on the same side.

[0020] In summary, the high-pressure clamping force has multiple paths in the movable die plate, the distribution of the clamping force is more uniform, compared with the traditional movable die plate with a single reinforcing rib structure in the form of a Chinese character, the unit load borne by the composite connecting arm of the present application is lower, and through the cooperation of the inclined pull reinforcing rib, the arch bridge reinforcing rib and the column reinforcing rib, the strength and rigidity of the movable die plate are significantly increased. During the clamping process, the mold is uniformly stressed and deformed in all directions, which can reduce the scrap rate of the product; at the same time, through the above high-rigidity and high-strength structure, the deformation of the movable die plate caused by the reaction force of the mold is greatly reduced, and the deformation of the pull rod fixing surface of the movable die plate is effectively reduced, which ensures that the pull rod is not easily damaged at the connection position and avoids the breakage of the pull rod; therefore, the deformation of the movable die plate during the clamping process can be well resisted. In this way, the service life of the movable die plate of the injection molding machine is increased, and the stability of the injection molding quality is significantly improved. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 Fig. 1 shows a schematic view of a clamping mechanism of an injection molding machine;

[0022] Figure 2 Fig. 2 shows a perspective view of a movable die plate;

[0023] Figure 3 Fig. 3 shows a perspective view of the movable die plate from another angle;

[0024] Figure 4Fig. 1 is a front view of the movable mold plate;

[0025] Figure 5 Fig. 2 is a sectional view of A-A of Fig. 1; Figure 4

[0026] Figure 6 Fig. 3 is a perspective view of Fig. 1. Figure 5

[0027] Fig. 1 is a front view of the movable mold plate;2, fixed mold plate; 3, pull rod; 10, movable mold plate body; 11, mold mounting surface; 12, pull rod through hole; 13, center matching hole; 14, circular ring reinforcing rib; 15, inclined pull reinforcing rib; 16, arched bridge reinforcing rib; 17, column reinforcing rib; 18, connecting rib; 19, thimble hole boss; 110, thimble arrangement hole; 1101, first thimble arrangement hole; 1102, second thimble arrangement hole; 111, first groove; 112, second groove; 113, notch; 114, foot pad. DETAILED DESCRIPTION

[0028] In the following, the present application will be further described in conjunction with the drawings and specific embodiments, and it should be noted that the following described embodiments or technical features can be combined with each other to form new embodiments without conflict.

[0029] In the description of the present application, it should be understood that the terms "center", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0030] In addition, the terms "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0031] ​In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0032] The application discloses a high-rigidity and low-deformation movable mold plate, which is especially used for a mold closing mechanism of a two-plate injection molding machine. Figure 1 The mold closing mechanism comprises a movable mold plate 1, a fixed mold plate 2, a pull rod 3 and the like. When the mold is locked, the movable mold plate 1 slides along the pull rod 3, the movable mold plate 1 is tightly attached to the fixed mold plate 2 to realize mold closing, the mold is clamped and high-pressure mold locking force is applied.

[0033] The high-rigidity and low-deformation movable mold plate comprises a movable mold plate body 10. Figure 2 The movable mold plate body 10 is provided with a mold mounting surface 11 in a concave structure on one side relative to the fixed mold plate 2, which is used for matching and mounting the mold. Figures 3-4 The movable mold plate body 10 is substantially rectangular in cross section, and pull rod through holes 12 are formed at four corner positions of the movable mold plate body 10 respectively, which are used for penetrating the pull rod 3 for guiding, so that the movable mold plate 1 is slidably penetrated on the pull rod 3 at the four corners, thereby approaching or moving away from the fixed mold plate 2 to realize mold closing or mold opening. A center matching hole 13 is arranged at the center position of the movable mold plate body 10, which is used for matching with the glue injection mechanism of the injection machine, and the center matching hole 13 is also located at the center position of the mold mounting surface 11.

[0034] The movable mold plate body 10 is internally provided with a composite connecting arm for transmitting the mold locking force, specifically, the mold locking force is transmitted from the pull rod through hole 12 to the mold mounting surface 11, thereby realizing tight mold locking. Figures 5-6 The composite connecting arm comprises a circular ring reinforcing rib 14, an inclined pull reinforcing rib 15, an arch bridge reinforcing rib 16, a column reinforcing rib 17 and a connecting rib 18. The circular ring reinforcing rib 14 is annularly arranged on the outer circumferential direction of the center matching hole 13. The inclined pull reinforcing rib 15 is linear, and two ends of the inclined pull reinforcing rib 15 are connected to the pull rod through hole 12 and the circular ring reinforcing rib 14 respectively, the number of the inclined pull reinforcing ribs 15 is four, and the four inclined pull reinforcing ribs 15 are distributed in a cross shape. The arch bridge reinforcing rib 16 is annularly arranged, and two ends of the arch bridge reinforcing rib 16 are connected to two pull rod through holes 12 on the same side respectively. The arch bridge reinforcing rib 16 is connected to the circular ring reinforcing rib 14 through the connecting rib 18, and one end of the connecting rib 18 is connected to the top position of the arch bridge reinforcing rib 16. One end of the column reinforcing rib 17 is connected to the bottom of the arch bridge reinforcing rib 16, and the other end of the column reinforcing rib 17 extends to the side edge of the movable mold plate 1.

[0035] In the process of locking, the locking oil cylinder installed on the four corners of the movable mold plate 1 outputs high-pressure locking force to the four corners of the movable mold plate 1, and the high-pressure locking force is transmitted to the mold mounting surface 11 through the composite connecting arm structure from the pull rod through hole 12. Figures 5-6 In the process of force transmission: ① The high-pressure locking force is transmitted from the pull rod through hole 12 to the circular ring reinforcing rib 14 through the inclined pull reinforcing rib 15, and then to the mold mounting surface 11; ② At the same time, the high-pressure locking force is also transmitted to the circular ring reinforcing rib 14 through the arch bridge reinforcing rib 16 and the connecting rib 18, and then to the mold mounting surface 11. The column reinforcing rib 17 is used to increase the strength of the arch bridge reinforcing rib 16. ③ The same arch bridge reinforcing rib 16 can conduct and distribute the force of two pull rod through holes 12 on the same side.

[0036] In summary, the transmission of high-pressure locking force inside the movable mold plate 1 has multiple paths, and the distribution of locking force is more uniform. Compared with the traditional movable mold plate 1 with a single reinforcing rib structure in the form of a Chinese character, the unit load borne by the composite connecting arm of the present application is lower, and through the cooperation between the inclined pull reinforcing rib 15, the arch bridge reinforcing rib 16 and the column reinforcing rib 17, the strength and rigidity of the movable mold plate 1 are significantly increased. In the locking process, the mold is uniformly stressed in all directions, and the deformation is uniform, which can reduce the scrap rate of the product; at the same time, through the above high-rigidity high-strength structure, the deformation of the movable mold plate 1 caused by the mold reaction force is greatly reduced, and the deformation of the pull rod 3 fixing surface of the movable mold plate 1 is effectively reduced, which ensures that the pull rod 3 is not prone to fatigue damage at the connection position, and avoids the pull rod 3 from breaking; therefore, the above can well resist the deformation of the movable mold plate 1 in the locking process. In this way, the service life of the movable mold plate 1 of the injection molding machine is increased, and the stability of the injection quality is significantly improved.

[0037] In the present application, two groups of independent ejector pins are used to eject the molded plastic product. Specifically, the movable die plate body 10 is further provided with two ejector pin hole bosses 19 arranged on two opposite sides of the circular annular rib. Each of the ejector pin hole bosses 19 is provided with a group of ejector pin arrangement holes 110, and the two groups of ejector pin arrangement holes 110 are independent of each other and are used to cooperate with the front and rear two groups of ejector pins for ejecting the injection molded product from the mold. The two groups of ejector pin arrangement holes 110 are respectively a first ejector pin arrangement hole 1101 and a second ejector pin arrangement hole 1102, which are arranged on both sides of the center fitting hole 13. In actual injection molding production, the shape of the plastic product is indefinite or often irregular. The existing movable die plate uses a group of ejector pins arranged at the center position to eject the plastic product. Thus, when the center of gravity or the centroid of the plastic product is at an eccentric position, or the shape of the plastic product is large on one side and small on the other side, the ejecting effect of the single group of center ejector pins is not good, and the plastic product is often still adhered to the die plate after being ejected. The present application uses two groups of independent ejector pins arranged on the left and right sides, and the actions of the two groups of ejector pins can be synchronous or independent, depending on the specific shape of the plastic product. When the center of gravity or the centroid of the product is located near the center, the two groups of ejector pins on both sides can jointly eject. When the center of gravity or the centroid of the product is located on one side, the corresponding single group of ejector pins is used to eject, so that the product can be ejected. Therefore, the mold provided by the present application has better ejecting effect, wider application of the mold, and more flexible application of the injection molding machine.

[0038] Preferably, the bottom of each arch-shaped bridge reinforcing rib 16 is connected with three column reinforcing ribs 17, and the column reinforcing ribs 17 are uniformly arranged.

[0039] Under the premise of ensuring that the movable die plate 1 has sufficient strength and rigidity, in order to reduce the production cost and the load of the clamping mechanism, how to reduce the weight of the movable die plate 1 is also a problem to be considered. Accordingly, the present application hollows out the ineffective part in the movable die plate body 10, thereby reducing the weight of the movable die plate 1. Specifically, the movable die plate body 10 is provided with a first recess 111, and the first recess 111 is located in the space enclosed by the inclined cable reinforcing rib 15, the arch-shaped bridge reinforcing rib 16, the connecting rib 18 and the ejector pin hole boss 19. Further, the movable die plate body 10 is further provided with a second recess 112, and the second recess 112 is located in the space enclosed by the arch-shaped bridge reinforcing rib 16, the column reinforcing rib 17 and the side edge of the movable die plate body 10.

[0040] Further, referring to Figure 6, and the two sides of the notch 113 are communicated with the first groove 111 and the second groove 112 respectively, facilitating the casting of the movable mold plate. Further, the number of the notch 113 on each of the arch bridge reinforcing ribs 16 is two, and the notch 113 is located between two adjacent column reinforcing ribs 17.

[0041] Preferably, the bottom surface of the movable mold plate body 10 is further convexly provided with a foot pad 114, and a blind hole is formed in the foot pad 114, as shown in Figure 5 .

[0042] The application further discloses an injection molding machine comprising the high-rigidity low-deformation movable mold plate 1.

[0043] The above-mentioned embodiments are only preferred embodiments of the application, and cannot be used to limit the protection scope of the application, and any non-essential changes and replacements made by those skilled in the art on the basis of the application shall be within the protection scope of the application.

Claims

1. A high-rigidity, low-deformation dynamic template, characterized in that, The system includes a movable template body; a mold mounting surface is provided on one side of the movable template body; tie rod through holes for threading tie rods are provided at the four corners of the movable template body, and a central mating hole is provided at the center; a composite connecting arm for transmitting clamping force is provided inside the movable template body; the composite connecting arm includes: a circular reinforcing rib, a diagonal reinforcing rib, an arched bridge reinforcing rib, and a column reinforcing rib; the circular reinforcing rib is protruding around the outer periphery of the central mating hole; the two ends of the diagonal reinforcing rib are respectively connected to the tie rod through hole and the circular reinforcing rib; there are four diagonal reinforcing ribs, arranged in a cross shape; the arched bridge reinforcing rib is arched, and its two ends are respectively connected to two tie rod through holes on the same side; the arched bridge reinforcing rib is also connected to the circular reinforcing rib by a connecting rib, one end of which is connected to the top of the arch of the arched bridge reinforcing rib; one end of the column reinforcing rib is connected to the bottom of the arch of the arched bridge reinforcing rib, and the other end extends to the side of the movable template; The moving template body is also provided with two ejector pin hole bosses, and ejector pin arrangement holes are opened on the ejector pin hole bosses; the two sets of ejector pin arrangement holes are independent of each other, namely the first ejector pin arrangement hole and the second ejector pin arrangement hole; the first ejector pin arrangement hole and the second ejector pin arrangement hole are respectively located on two opposite sides of the circular reinforcing rib; the ejector pin arrangement hole passes through the mold mounting surface; One end of the connecting rib located on both sides of the ejector pin arrangement hole is connected to the top of the arch of the arched bridge reinforcement, and the other end is connected to the ejector pin hole boss. The moving template body is also recessed with a first groove, and the inclined reinforcing rib, the arched bridge reinforcing rib, the connecting rib, and the pin hole boss surround the first groove; The moving template body is also recessed with a second groove, and the arched bridge reinforcing rib, the column reinforcing rib, and the side of the moving template body surround the second groove; The arched bridge reinforcing ribs are also provided with several notches at intervals, and the two sides of the notches are respectively connected to the first groove and the second groove.

2. The high-rigidity, low-deformation dynamic template as described in claim 1, characterized in that, Each of the arched bridge reinforcing bars is connected to three column reinforcing bars at its bottom, and the column reinforcing bars are evenly spaced apart.

3. The high-rigidity, low-deformation dynamic template as described in claim 1, characterized in that, The arched bridge reinforcing bar has two notches, which are located between two adjacent column reinforcing bars.

4. The high-rigidity, low-deformation dynamic template as described in claim 1, characterized in that, The bottom surface of the moving template body is also provided with a pad, and a blind hole is opened in the pad.

5. An injection molding machine, characterized in that, Including the high-rigidity, low-deformation dynamic template as described in any one of claims 1 to 4.

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