Injection mold adopting ejector sleeve for ejection

Abstract

The utility model discloses an injection mold adopting an ejector sleeve for ejection, which comprises a front mold, a rear mold, a rear mold plate and an annular product cavity enclosed by the front mold plate, the rear mold comprises an ejector sleeve component and an ejector plate component, and the ejector sleeve component comprises an outer-layer ejector sleeve, an ejector sleeve insert and an ejector sleeve sprue puller which are sequentially sleeved from outside to inside; when the ejector plate assembly moves in the mold opening and closing direction, the outer-layer ejector sleeve and the ejector sleeve sprue puller are driven to integrally move relative to the ejector sleeve insert in the mold opening and closing direction. According to the utility model, the product is ejected by adopting the ejector sleeve assembly, an insert line or an ejection trace on the product is formed on the end surface of the product, and the end surface of the product is an unimportant appearance surface of the product, so that the main appearance surface of the product is not influenced, and the rejection rate of the product is reduced; and the ejection action of the product is simple, the mold opening action of the mold is not increased, the mold structure stability is good, and the mold is particularly suitable for large-size multi-cavity molds with high structural stability requirements.

Description

Technical Field

[0001] The utility model belongs to the technical field of molds, and specifically relates to an injection mold using a push tube for ejection. Background Art

[0002] Injection molding is a method for processing and molding plastic pellets or powders (mostly thermoplastic plastics). Its molding process is to first add plastic into the barrel of an injection molding machine and heat it to a viscous flow state melt, and then with the thrust of the screw of the injection molding machine, the melt fills the closed mold cavity through the nozzle and the mold gating system at a relatively high pressure and speed. After cooling for a certain period of time to harden and shape the plastic, the mold can be opened to take out the product.

[0003] An injection mold is a production tool that can repeatedly and mass-produce plastic products, parts, etc.

[0004] In the prior art, to realize the function of ejecting the product after the product slider exits, a post-withdrawal structure is generally adopted, that is, the core of the rear mold is first withdrawn to separate the product from the rear mold core, and then the ejector rod on the rear mold is used for ejection. Since there are forming inserts on the rear mold core, using the post-withdrawal structure will form insert lines on the main appearance surface of the product (such as the outer side surface of an annular product), and the product will be deformed during ejection. In addition, a support plate generally needs to be added under the rear template for the post-withdrawal structure, which will correspondingly increase one mold opening action.

[0005] In addition, to improve the injection molding efficiency, an injection mold usually also adopts a multi-cavity structure. Due to the large number of cavities in the multi-cavity structure mold, the mold size is large. For example, for a 48-cavity mold, its length is more than 1000 mm, and the large mold size will result in relatively poor mold structure stability, and the mold is prone to jamming during multiple mold opening actions.

[0006] Therefore, it is urgent to improve the existing injection mold so that no redundant insert lines and ejection marks are formed on the main appearance surface of the product during product ejection, and the number of mold opening actions is reduced, and the mold structure stability is improved.

[0007] The above information disclosed in this background art is only used to increase the understanding of the background art of this application. Therefore, it may include prior art that is not known to those of ordinary skill in the art. Summary of the Invention

[0008] The utility model provides an injection mold using a push tube for ejection, which can solve the problems in the prior art that when using an ejector rod to eject the product, redundant insert lines and ejection marks are likely to appear, and the number of mold opening actions is large, affecting the mold structure stability.

[0009] To achieve the purpose of solving the above technical problems, the utility model adopts the following technical solutions: An injection mold using a push tube for ejection, comprising:

[0010] The front mold includes a front template, and a main runner is provided on the front template.

[0011] The rear mold includes a rear template, an ejector plate assembly, a fixed bottom plate, and a push tube assembly for ejecting the product after mold opening. The rear template and the front template enclose an annular product cavity, and a rear template through-hole is formed on the rear template for the front end of the push tube assembly to extend into the annular product cavity.

[0012] The push tube assembly includes an outer push tube, a push tube insert, and a push tube pull rod sleeved in sequence from outside to inside. A product inner wall forming part, a main gate aligned with the main runner, and a plurality of sub-gates communicating with the main gate are formed on the front end of the push tube insert. The rear end of the push tube insert is fixedly connected to the fixed bottom plate, and the main gate communicates with the inner space of the push tube insert. A product end face forming part is formed on the front end of the outer push tube, and the rear end is fixedly connected to the ejector plate assembly. A material handle pulling part is formed on the front end of the push tube pull rod. In the non-ejected state, the position of the material handle pulling part is lower than that of the main gate, and the rear end of the push tube pull rod is fixedly connected to the ejector plate assembly.

[0013] When the ejector plate assembly moves in the mold opening and closing direction, it drives the outer push tube and the push tube pull rod as a whole to move relative to the push tube insert in the mold opening and closing direction.

[0014] In some embodiments of the present application, the material handle pulling part is an inverted Z-shaped protrusion formed on the front end face of the push tube pull rod.

[0015] In some embodiments of the present application, the product end face forming part includes an inner flat part and an outer flat part formed on the front end face of the outer push tube. Along the radial direction of the front end face of the outer push tube, the outer flat part is located outside the inner flat part. The position of the outer flat part is lower than that of the inner flat part, and the outer flat part and the inner flat part are connected by an arc transition.

[0016] In some embodiments of the present application, the product inner wall forming part is the circumferential outer wall at the front end of the push tube insert. In the non-ejected state, the position of the product end face forming part is lower than that of the product inner wall forming part.

[0017] In some embodiments of the present application, the plurality of sub-gates are uniformly arranged circumferentially around the main gate.

[0018] In some embodiments of the present application, the ejector plate assembly includes a first ejector plate, a second ejector plate, and a third ejector plate that are integrally fixed. The first ejector plate, the second ejector plate, and the third ejector plate are sequentially and rearwardly away from the front template. The first ejector plate and the second ejector plate are in contact with each other, and the fixed bottom plate is located between the second ejector plate and the third ejector plate;

[0019] A first limiting boss is formed on the rear end of the outer ejector sleeve. A first through hole adapted to the rear end of the outer ejector sleeve is formed on the first ejector plate. The rear end of the outer ejector sleeve is inserted into the first through hole, and the first limiting boss is clamped between the first ejector plate and the second ejector plate;

[0020] A second limiting boss is formed on the rear end of the ejector sleeve insert. A second through hole adapted to the rear end of the ejector sleeve insert is formed on the fixed bottom plate. An intermediate through hole aligned with the first through hole is formed on the second ejector plate. The ejector sleeve insert passes through the first through hole, the intermediate through hole, and the second through hole, and is fixedly connected to the fixed bottom plate by screws;

[0021] A third limiting boss is formed on the rear end of the ejector sleeve pull rod. A third through hole adapted to the rear end of the ejector sleeve pull rod is formed on the third ejector plate. The ejector sleeve pull rod passes through the first through hole, the intermediate through hole, the second through hole, and the third through hole, and is fixedly connected to the third ejector plate by screws.

[0022] In some embodiments of the present application, the fixed bottom plate is connected to the rear template by screws, and a first avoidance space is left between the fixed bottom plate and the rear template. The first ejector plate and the second ejector plate move together in the mold opening and closing direction within the first avoidance space;

[0023] A second avoidance space is left at the rear side of the fixed bottom plate. The third ejector plate moves synchronously in the mold opening and closing direction within the second avoidance space.

[0024] In some embodiments of the present application, the injection mold further includes an injection machine connection block. One end of the injection machine connection block is connected to the first ejector plate or the second ejector plate, and the other end is used to connect to the ejector rod of the injection machine. The ejector plate assembly is driven by the injection machine to perform the ejection action;

[0025] The injection mold further includes an ejection reset component for driving the ejector plate assembly to perform the reset action.

[0026] In some embodiments of the present application, the injection mold further includes a first limiting component and a second limiting component for respectively limiting the ejection and reset actions of the ejector plate assembly.

[0027] In some embodiments of the present application, the injection mold further includes an ejection guiding member for guiding the ejection and resetting actions of the ejector plate assembly.

[0028] Compared with the prior art, the present utility model has the following advantages and positive effects:

[0029] 1. The present utility model uses a push tube assembly to eject the product. The push tube assembly includes an outer push tube, a push tube insert, and a push tube pull rod that are sleeved from the outside to the inside in sequence. The outer push tube is used to contact the end face of the annular product to eject the product. The push tube insert is used to form the main gate and the submarine gate. The push tube pull rod is used to break the sprue. The movement of the ejector plate assembly in the mold opening and closing direction drives the overall movement of the outer push tube and the push tube pull rod relative to the push tube insert in the mold opening and closing direction, thereby realizing the ejection of the product by the outer push tube and the breaking of the sprue by the push tube pull rod, achieving the separation of the sprue from the product, and the smooth ejection of the product. Then, by using the present utility model, the insert line or ejection mark on the product is formed on the end face of the product, and the end face of the product is the non-important appearance surface of the product, which does not affect the main appearance surface of the product, thus being beneficial to reducing the rejection rate of the product;

[0030] 2. For the injection mold of the present utility model, the ejection action of the product is simple and does not increase the mold opening action. The mold structure has good stability, especially suitable for large-size multi-cavity molds with high requirements for structural stability.

[0031] After reading the specific embodiments of the present utility model in conjunction with the accompanying drawings, other features and advantages of the present utility model will become clearer. Description of the Drawings

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the following-described drawings are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0033] Figure 1 is a schematic structural diagram of an injection mold using a push tube for ejection in an embodiment of the present utility model;

[0034] Figure 2 is Figure 1 an enlarged view of part A of

[0035] Figure 3 is a perspective view of the push tube assembly in an embodiment of the present utility model;

[0036] Figure 4 is Figure 3 an enlarged view of part B of

[0037] Figure 5 isFigure 3 Front view of the ejector pipe assembly shown

[0038] Figure 6 is Figure 5 Cross-sectional view taken along line C-C of

[0039] Figure 7 is Figure 6 Enlarged view of part D of

[0040] Figure 8 Schematic diagram of the relative positions of the ejector pipe assembly and the ejector plate assembly before ejection in the embodiment of the present utility model

[0041] Figure 9 Schematic diagram of the relative positions of the ejector pipe assembly and the ejector plate assembly after ejection in the embodiment of the present utility model

[0042] In the figure, 1, injection mold; 100, front mold; 110, front template; 111, front mold core; 112, main runner; 200, rear mold; 210, rear template; 211, rear mold core; 220, ejector plate assembly; 221, first ejector plate; 2211, first through hole; 222, second ejector plate; 2221, middle through hole; 223, third ejector plate; 2231, third through hole; 230, fixed bottom plate; 231, second through hole; 240, ejector pipe assembly; 241, outer ejector pipe; 2411, first limiting boss; 2412, product end face forming part; 24121, outer flat part; 24122, inner flat part; 242, ejector pipe insert; 2421, second limiting boss; 2422, main gate; 2423, submarine gate; 2424, product inner wall forming part; 243, ejector pipe puller bar; 2431, third limiting boss; 2432, sprue puller part; 244, fixed cushion block; 245, first avoidance space; 246, square iron; 247, second avoidance space; 248, rear mold bottom plate; 300, injection machine connecting block; 400, return rod; 500, trash nail; 600, ejection guiding part; 700, limiting post

[0043] 2, annular product;

[0044] 3, sprue Detailed implementation manners

[0045] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model

[0046] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

[0047] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. In the description of the embodiments, specific features, structures, materials, or characteristics can be combined in a suitable manner in any one or more embodiments or examples.

[0048] The terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features.

[0049] In the description of the present utility model, unless otherwise stated, "a plurality of" means two or more.

[0050] Referring to Figures 1 to 7 , in some embodiments of the present application, an injection mold 1 using a push tube for ejection includes a front mold 100 and a rear mold 200.

[0051] Among them, the front mold 100 includes a front template 110, and a main runner 112 is provided on the front template 110.

[0052] The rear mold 200 includes a rear template 210, a thimble plate assembly 220, a fixed bottom plate 230, and a push tube assembly 240 for ejecting the product after mold opening. The rear template 210 and the front template 110 enclose an annular product cavity. A through portion of the rear template is formed on the rear template 210, and the through portion of the rear template is used for the front end of the push tube assembly 240 to extend into the annular product cavity to participate in product forming after mold closing and product ejection after forming. The axial direction of the push tube assembly 240 is parallel to the mold opening and closing direction of the injection mold 1. Its front end is the end closer to the side where the front mold 100 is located, and the rear end is the end farther from the side where the front mold 100 is located. Similarly, the front ends and rear ends of the following outer push tubes 241, push tube inserts 242, and push tube pull rods 243 are also defined according to this standard.

[0053] In some embodiments of the present application, the front template 110 includes a front mold core 111, the rear mold plate 200 includes a rear mold core 211, and the front mold core 111 and the rear mold core 211 enclose an annular product cavity.

[0054] The push tube assembly 240 specifically includes an outer push tube 241, a push tube insert 242, and a push tube knockout rod 243. The outer push tube 241, the push tube insert 242, and the push tube knockout rod 243 are sleeved in sequence from outside to inside. That is, both ends of the outer push tube 241 are through, and it is sleeved on the push tube insert 242. Both ends of the push tube insert 242 are through, and it is sleeved on the push tube knockout rod 243. The push tube knockout rod 243 is a solid rod.

[0055] In some embodiments of the present application, a product inner wall forming portion 2424, a main gate 2422 aligned with the main runner 112, and a plurality of sub-gates 2423 communicating with the main gate 2422 are formed on the front end of the push tube insert 242. The rear end of the push tube insert 242 is fixedly connected to the fixed bottom plate 230. The fixed bottom plate 230 is fixed and immovable. The main gate 2422 communicates with the internal space of the push tube insert 242.

[0056] As Figure 1 and Figure 2 shown, in the closed mold state, the molten rubber material enters the main gate 2422 of the push tube insert 242 through the main runner 112 on the front template 110, and then enters the annular product cavity through the plurality of sub-gates 2423 to form the annular product 2.

[0057] A product end face forming portion 2412 is formed on the front end of the outer push tube 241. The product end face forming portion 2412 extends into the annular product cavity to participate in forming the rear end face of the annular product 2. The rear end of the outer push tube 241 is fixedly connected to the ejector plate assembly 220.

[0058] A material handle pulling portion 2432 is formed on the front end of the push tube knockout rod 243. In the state of the mold closed and not ejected, the position of the material handle pulling portion 2432 is lower than the main gate 2422. That is, as Figure 4 and Figure 7 shown, the material handle pulling portion 2432 retracts into the interior of the push tube insert 242, at a certain distance from the top end of the push tube insert 242, to form a material handle forming space. The rear end of the push tube knockout rod 243 is fixedly connected to the ejector plate assembly 220.

[0059] The rear end of the outer push tube 241 is fixedly connected to the ejector plate assembly 220, the rear end of the push tube knockout rod 243 is fixedly connected to the ejector plate assembly 220, and the rear end of the push tube insert 242 is fixedly connected to the fixed bottom plate 230. When the ejector plate assembly 220 moves in the mold opening and closing direction, it drives the outer push tube 241 and the push tube knockout rod 243 as a whole to move relative to the push tube insert 242 in the mold opening and closing direction, thereby realizing the separation of the material handle from the product and the ejection of the product.

[0060] Specifically, referring to Figure 8 and Figure 9 , and in combination with Figure 1 and Figure 2 , after the injection molding is completed, the front mold 100 drives the core-pulling mechanism (specifically the inclined guide pillar-slider core-pulling mechanism) to open the mold, and the product remains in the rear mold 200, and the sprue 3 remains on the ejector sleeve puller rod 243; when the ejection starts, the ejector plate assembly 220 moves in the mold opening direction, that is, the upward movement as shown in the figure. Since the ejector plate assembly 220 moves as a whole and is a multi-cavity structure, the ejection actions of the multiple products corresponding to the multi-cavities are consistent. The outer ejector sleeve 241 contacts the rear end face of the annular product 2 to apply an ejection force to the annular product 2 to eject the product upward. Synchronously, the ejector sleeve puller rod 243 applies an ejection force to the sprue 3 to eject the sprue 3 upward, and the ejection movement direction is as Figure 8 indicated by the arrow. Since the ejector sleeve insert 242 does not move, the sprue 3 and the annular product 2 are connected by the rubber material in the submarine gate 2423 on the ejector sleeve insert 242. When the annular product 2 and the sprue 3 are ejected synchronously, due to the existence of the submarine gate 2423, the sprue 3 will be broken and separated from the annular product 2, as Figure 9 shown, realizing the function of automatically cutting off the gate, and the annular product 2 can also be smoothly ejected. The ejector plate assembly 220 moves to the set position, and the ejection action ends. The ejector plate assembly 220 resets. After the reset is completed, all the ejection structures on the ejector plate assembly 220 reset to the mold closing state.

[0061] Then, the injection mold 1 in some embodiments of the present application is adopted. The insert line or ejection mark on the annular product 2 is formed on the end face of the product, and the product end face is the non-important appearance surface of the product, which does not affect the main appearance surface of the product, so it is beneficial to reduce the rejection rate of the product; and the ejection action of the product is simple, which will not increase the mold opening action, and the mold structure has good stability, especially suitable for large-size multi-cavity molds with high requirements for structural stability.

[0062] In some embodiments of the present application, as Figure 7 shown, the sprue pulling part 2432 is an inverted Z-shaped protrusion formed on the front end face of the ejector sleeve puller rod 243. The sprue pulling part 2432 with this structural form can increase the contact area with the sprue 3, thereby increasing the adhesion force and hooking force with the sprue 3 to prevent the sprue 3 from easily detaching from the sprue pulling part 2432 and causing the failure of the gate cutting function.

[0063] Of course, the sprue pulling part 2432 can also be other special-shaped structures, such as a T-shaped columnar protrusion with a wide front and a narrow rear or other special-shaped protrusions or grooves of other shapes, as long as it can increase the adhesion force and hooking force with the sprue.

[0064] In some embodiments of the present application, the product end face forming portion 2412 includes an inner flat portion 24122 and an outer flat portion 24121 formed on the front end face of the outer layer push tube 241. Along the radial direction of the front end face of the outer layer push tube 241, the outer flat portion 24121 is located outside the inner flat portion 24122; the position of the outer flat portion 24121 is lower than that of the inner flat portion 24122, and the outer flat portion 24121 and the inner flat portion 24122 are connected by an arc transition. That is, the product end face forming portion 2412 is not in planar contact with the end face of the annular product 2, and it also plays a role in increasing the contact area between the two, so that the product ejection action is smooth and reliable.

[0065] In some embodiments of the present application, the product inner wall forming portion 2424 of the push tube insert 242 is the circumferential outer wall at the front end of the push tube insert 242. In the state of the mold being closed and not ejected, the position of the product end face forming portion 2412 is lower than that of the product inner wall forming portion 2424, so that the inner forming portion of the product can smoothly participate in the forming of the product inner wall.

[0066] In some embodiments of the present application, a plurality of submarine gates 2423 are uniformly arranged circumferentially around the main gate 2422, so that the molten rubber material entering the main gate 2422 from the main runner 112 can enter the cavity of the annular product 2 evenly through the plurality of submarine gates 2423 to ensure the forming quality of the product.

[0067] In some embodiments of the present application, for the ejector plate assembly 220, as Figure 1 、 Figure 8 and Figure 9 shown, it includes a first ejector plate 221, a second ejector plate 222 and a third ejector plate 223 fixedly connected together. The first ejector plate 221, the second ejector plate 222 and the third ejector plate 223 are sequentially away from the front template 110 backward. Specifically, the first ejector plate 221, the second ejector plate 222 and the third ejector plate 223 are parallel to each other and are all perpendicular to the mold opening and closing direction. The first ejector plate 221 is the closest to the front template 110, followed by the second ejector plate 222, and the third ejector plate 223 is the farthest from the front template 110. The first ejector plate 221 and the second ejector plate 222 are in contact with each other, and the fixed bottom plate 230 is located between the second ejector plate 222 and the third ejector plate 223.

[0068] Specifically, the top surface of the second ejector plate 222 is in contact with the top surface of the first ejector plate 221. The first ejector plate 221 and the second ejector plate 222 can be fixedly connected by a plurality of screws. The fixed bottom plate 230 can be fixedly connected to the rear mold 200 plate by long screws and remains stationary.

[0069] A first limiting boss 2411 is formed on the rear end of the outer ejector sleeve 241, and a first through portion 2211 adapted to the rear end of the outer ejector sleeve 241 is formed on the first ejector plate 221. The rear end of the outer ejector sleeve 241 is inserted into the first through portion 2211, and the first limiting boss 2411 is clamped between the first ejector plate 221 and the second ejector plate 222. Wherein, the outer diameter of the first limiting boss 2411 is greater than the outer diameter of the outer ejector sleeve 241, and the first through portion 2211 on the first ejector plate 221 is adapted to the contour shape of the rear end of the outer ejector sleeve 241. Then, the first through portion 2211 has a portion adapted to the first limiting boss 2411, and the first limiting boss 2411 is embedded in this portion, which can prevent the outer ejector sleeve 241 from moving away from the first ejector plate 221 and the second ejector plate 222 along the mold opening direction. At the same time, since the first ejector plate 221 and the second ejector plate 222 are attached and fixed, the first limiting boss 2411 is clamped between the first ejector plate 221 and the second ejector plate 222, thereby ensuring the fixed connection between the outer ejector sleeve 241 and the first ejector plate 221 and the second ejector plate 222.

[0070] During specific installation, the outer ejector sleeve 241 can be inserted forward through the first through portion 2211 from the rear side of the first ejector plate 221 until the first limiting boss 2411 is embedded in the first through portion 2211 and abuts against the first ejector plate 221, and then the second ejector plate 222 is fixedly connected to the first ejector plate 221.

[0071] In some embodiments of the present application, similarly, a second limiting boss 2421 is formed on the rear end of the ejector sleeve insert 242, a second through portion 231 adapted to the rear end of the ejector sleeve insert 242 is formed on the fixed bottom plate 230, and an intermediate through portion 2221 aligned with the first through portion 2211 is formed on the second ejector plate 222. The ejector sleeve insert 242 passes through the first through portion 2211, the intermediate through portion 2221 and the second through portion 231 and is fixedly connected to the fixed bottom plate 230 by screws.

[0072] During specific installation, the ejector sleeve insert 242 can be inserted forward from the rear side of the fixed bottom plate 230 through the second through portion 231, the intermediate through portion 2221 and the first through portion 2211 for installation until the second limiting boss 2421 is embedded in the second through portion 231 and abuts against the fixed bottom plate 230, and then a fixed spacer 244 is screwed to the fixed bottom plate 230 to block the second through portion 231 and support the ejector sleeve insert 242.

[0073] In some embodiments of the present application, similarly, a third limiting boss 2431 is formed on the rear end of the push tube pull rod 243, and a third through hole 2231 adapted to the rear end of the push tube pull rod 243 is formed on the third ejector plate 223. The push tube pull rod 243 passes through the first through hole 2211, the middle through hole 2221, the second through hole 231 and the third through hole 2231, and is fixedly connected to the third ejector plate 223 by screws.

[0074] During specific installation, the push tube pull rod 243 can be inserted and installed forward from the rear side of the third ejector plate 223 through the third through hole 2231, the second through hole 231, the middle through hole 2221, and the first through hole 2211 until the third limiting boss 2431 is embedded in the third through hole 2231 and abuts against the third ejector plate 223. Then, a fixing cushion block 244 is connected to the third ejector plate 223 by screws to block the third through hole 2231 and support the push tube pull rod 243.

[0075] In some embodiments of the present application, the fixed bottom plate 230 is connected to the rear mold 200 plate by screws to keep it stationary, and a first avoidance space 245 is left between the fixed bottom plate 230 and the rear mold 200 plate. The first ejector plate 221 and the second ejector plate 222 move together in the mold opening and closing direction within the first avoidance space 245. Specifically, the connecting screws between the fixed bottom plate 230 and the rear mold 200 plate are located at the circumferential edges of the two, and a plurality of square irons 246 are arranged along the circumferential direction at the edges between the two. The connecting screws pass through the square irons 246 to fixedly connect the fixed bottom plate 230 and the rear mold 200 plate into one body. The space enclosed by the plurality of square irons 246 is the first avoidance space 245.

[0076] A second avoidance space 247 is left at the rear side of the fixed bottom plate 230, and the third ejector plate 223 moves synchronously in the mold opening and closing direction within the second avoidance space 247.

[0077] For the ejection action of the ejector plate assembly 220, in some embodiments of the present application, the injection mold 1 using push tube ejection further includes an injection machine connecting block 300. One end of the injection machine connecting block 300 is connected to the first ejector plate 221 or the second ejector plate 222, and the other end is used to connect to the injection machine ejector rod. The injection machine ejector rod pushes the first ejector plate 221 and the second ejector plate 222 as a whole to achieve the ejection action through the injection machine connecting block 300, that is, the ejection action is controlled by the injection machine.

[0078] Specifically, the front end of the injection molding machine connecting block 300 has a limiting boss. The second ejector plate 222 has an insertion hole adapted to the front end of the injection molding machine connecting block 300. The front end of the injection molding machine connecting block 300 is inserted into the insertion hole and the limiting boss is clamped between the first ejector plate 221 and the second ejector plate 222, thereby fixing the injection molding machine connecting block 300 to the first ejector plate 221 and the second ejector plate 222.

[0079] For the reset action of the ejector plate assembly 220, in some embodiments of the present application, the injection mold 1 using a push tube for ejection further includes an ejection and reset component (not shown) for driving the ejector plate assembly 220 to perform a reset action. The ejection and reset component may specifically be a spring clamped between the rear mold 200 plate and the first ejector plate 221. During ejection, the spring is compressed. When the ejector rod of the injection molding machine is withdrawn, the spring restores its deformation to drive the ejector plate assembly 220 to reset.

[0080] Due to long-term use, there may be a situation where the ejector plate assembly 220 fails to reset completely when driven by the spring. To solve this problem, a reset rod 400 is also fixedly connected to the whole formed by the first ejector plate 221 and the second ejector plate 222. A through hole for the reset rod 400 to pass forward is formed on the rear mold 200 plate, and the front end of the reset rod 400 penetrates into this through hole. When the ejector plate assembly 220 fails to reset completely, the front end of the reset rod 400 penetrates forward through this through hole on the rear mold 200 plate. At this time, the closing action of the front template 110 can press down the reset rod 400, thereby pressing the ejector plate assembly 220 to reset completely.

[0081] In some embodiments of the present application, the injection mold 1 further includes a first limiting component and a second limiting component for respectively limiting the ejection and reset actions of the ejector plate assembly 220.

[0082] Specifically, the first limiting component is a limiting post 700 fixedly provided on the rear template 210. When the ejector plate assembly 220 moves forward during ejection until the first ejector plate 221 reaches the position of the limiting post 700, the ejection action ends. The second limiting component is a trash nail 500 fixedly provided on the fixed bottom plate 230. When the ejector plate assembly 220 moves backward during reset until the second ejector plate 222 reaches the position of the trash nail 500, the reset ends and the mold closes. Of course, trash nails 500 can also be provided on the rear side of the third ejector plate 223.

[0083] In some embodiments of the present application, the injection mold 1 using a push tube for ejection further includes an ejection guiding component 600 for guiding the ejection and reset actions of the ejector plate assembly 220 to ensure the reliability and smoothness of the ejection and reset actions, thereby ensuring the product molding quality.

[0084] Such as Figure 1As shown, the injection mold 1 using a push tube for ejection includes a rear mold bottom plate 248, which is located at the rear side of the third ejector plate 223 and is fixedly connected to the square iron 246 between the fixed bottom plate 230 and the rear mold 200 plate by long screws to ensure being stationary. The ejection guiding component 600 is a guide post structure, one end of which is fixedly connected to the rear mold plate 210, the other end of which is fixedly connected to the rear mold bottom plate 248, and it passes through the fixed bottom plate 230 and the ejector plate assembly 220. The ejector plate assembly 220 is in sliding guiding cooperation with the ejection guiding component 600. A relief through hole is also reserved on the rear mold bottom plate 248 for the rear end of the injection machine connecting block 300 to extend out and connect to the injection machine ejector rod.

[0085] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, for those of ordinary skill in the art, it is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions required to be protected by the present invention.

Claims

1. An injection mold using a push tube ejection method, characterized in that: include: A front mold, comprising a front mold plate, wherein the front mold plate is provided with a main flow channel; The rear mold includes a rear mold plate, an ejector plate assembly, a fixed bottom plate, and a push tube assembly for ejecting the product after the mold is opened. The rear mold plate and the front mold plate form an annular product cavity. The rear mold plate is provided with a rear mold plate through portion for the front end of the push tube assembly to extend into the annular product cavity. The push tube assembly comprises an outer push tube, a push tube insert and a push tube pulling rod which are sequentially sleeved from the outside to the inside; a product inner wall forming portion, a main gate aligned with the main channel and a plurality of submerged gates connected with the main gate are formed on the front end of the push tube insert, the rear end of the push tube insert is fixedly connected to the fixed bottom plate, and the main gate is connected to the internal space of the push tube insert; a product end face forming portion is formed on the front end of the outer push tube, and the rear end is fixedly connected to the ejector plate assembly; a material handle pulling portion is formed on the front end of the push tube pulling rod, and in the non-ejecting state, the material handle pulling portion is located lower than the main gate, and the rear end of the push tube pulling rod is fixedly connected to the ejector plate assembly; When the ejector plate assembly moves along the mold opening and closing direction, the outer layer push tube and the push tube pulling rod are driven to move as a whole relative to the push tube insert along the mold opening and closing direction.

2. The injection mold using push tube ejection according to claim 1, characterized in that: The material handling material pulling portion is an inverted Z-shaped protrusion formed on the front end surface of the push tube material pulling rod.

3. The injection mold using push tube ejection according to claim 1, characterized in that: The product end face forming portion includes an inner plane portion and an outer plane portion formed on the front end face of the outer push tube, and along the radial direction of the front end face of the outer push tube, the outer plane portion is located on the outside of the inner plane portion; the position of the outer plane portion is lower than the inner plane portion, and the outer plane portion and the inner plane portion are connected by a circular arc transition.

4. The injection mold using push tube ejection according to claim 1, characterized in that: The product inner wall forming portion is the front circumferential outer wall of the push tube insert. In the un-ejected state, the position of the product end face forming portion is lower than the position of the product inner wall forming portion.

5. The injection mold using push tube ejection according to claim 1, characterized in that: The plurality of subgates are evenly arranged along the circumferential direction around the periphery of the main gate.

6. The injection mold using push tube ejection according to claim 1, characterized in that: The ejector plate assembly comprises a first ejector plate, a second ejector plate and a third ejector plate which are fixedly connected as one body, the first ejector plate, the second ejector plate and the third ejector plate are sequentially moved backward away from the front template, the first ejector plate and the second ejector plate are fitted together, and the fixed bottom plate is located between the second ejector plate and the third ejector plate; A first limiting boss is formed on the rear end of the outer push tube, a first through portion adapted to the rear end of the outer push tube is formed on the first ejector plate, the rear end of the outer push tube is inserted into the first through portion, and the first limiting boss is sandwiched between the first ejector plate and the second ejector plate; A second limiting boss is formed on the rear end of the push tube insert, a second through-hole matched with the rear end of the push tube insert is formed on the fixed bottom plate, an intermediate through-hole aligned with the first through-hole is formed on the second ejector plate, the push tube insert passes through the first through-hole, the intermediate through-hole and the second through-hole, and is fixedly connected to the fixed bottom plate with screws; A third limiting boss is formed on the rear end of the push tube and pull rod, and a third through portion matched with the rear end of the push tube and pull rod is formed on the third ejector plate. The push tube and pull rod passes through the first through portion, the middle through portion, the second through portion and the third through portion, and is fixedly connected to the third ejector plate by screws.

7. The injection mold using push tube ejection according to claim 6, characterized in that: The fixed bottom plate is connected to the rear template with screws, and a first avoidance space is left between the fixed bottom plate and the rear template, and the first ejector plate and the second ejector plate move together along the mold opening and closing direction in the first avoidance space; A second avoidance space is reserved at the rear side of the fixed bottom plate, and the third ejector plate moves synchronously along the mold opening and closing direction in the second avoidance space.

8. The injection mold using push tube ejection according to claim 6, characterized in that: The injection mold further comprises an injection molding machine connecting block, one end of which is connected to the first ejector plate or the second ejector plate, and the other end of which is used to connect to an ejector rod of the injection molding machine, and the ejector plate assembly is driven by the injection molding machine to realize ejection action; The injection mold also includes an ejection reset component for driving the ejector plate assembly to achieve a reset action.

9. The injection mold using push tube ejection according to claim 8, characterized in that: The injection mold further comprises a first limiting component and a second limiting component, which are used to limit the ejection and reset actions of the ejector plate assembly respectively.

10. The injection mold using push tube ejection according to claim 1, characterized in that: The injection mold also includes an ejection guide component for guiding the ejection and resetting actions of the ejector plate assembly.

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