Multi-cavity injection mold with U-shaped runner
By designing a U-shaped runner multi-cavity injection mold, the automatic separation of the product and the sprue is achieved using a submersible gate insert and a clamping mechanism, which solves defects such as ejector pin marks, pits, and deformation, improves the product's appearance quality, and reduces costs.
Patent Information
- Application Number
- CN202520209933.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-10
- Publication Date
- 2026-02-13
- Estimated Expiration
- 2035-02-10
AI Technical Summary
Existing injection molds are prone to defects such as ejector pin marks, pits, and deformation when ejecting products, which affect the appearance quality of the products and result in long production cycles and high costs.
The U-shaped runner multi-cavity injection mold is adopted. By setting the submersible gate insert and clamping mechanism in the front mold, the product cavity and runner are formed when the mold is closed. When the mold is opened, the shearing force of the clamping mechanism and the submersible gate insert is used to separate the product and the gate. The product is then removed by a robot, eliminating the need for the rear mold ejection system.
It avoids product surface defects, improves appearance quality, reduces mold material and processing costs, and simplifies the production process.
Smart Images
Figure CN223904431U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of injection mold, more particularly to a U type runner multi -cavity injection mold. BACKGROUND
[0002] PVC pipe fitting has the advantages of convenient installation, good sealing, high compressive strength and the like, and is extremely widely used in the market. Small and medium-sized elbow pipe fitting products often adopt a multi-cavity mold structure, and the product is pushed out and dropped to be collected by using a pin mechanism after being molded, cooled and shaped. When the product is ejected, the product and the water gap are demolded at the same time, and the water gap on the product needs to be removed manually, prolonging the production cycle. When the product is ejected from the mold by the pin, pin marks, dents and deformation are easily generated on the product, affecting the appearance of the product.
[0003] The prior art discloses an automatic plastic water gap breaking mold for an automotive interior panel, comprising a glue inlet nozzle, a fixed mold core and a movable mold core, the fixed mold core and the movable mold core constitute a mold cavity, and a sprue is arranged to penetrate into the mold cavity. A pressure bushing is arranged at one end of the glue inlet nozzle corresponding to the glue inlet chamber, and a spring is arranged to keep the pressure bushing in the glue inlet chamber. A pin is arranged to penetrate through the movable mold core at the glue inlet chamber of the double-layered pin plate of the mold. A chamber is arranged in the double-layered pin plate to accommodate the end of the pin. The height of the chamber is greater than the height of the end of the pin. The plastic sprue is kept in the movable mold core when the mold is opened and the push rod is ejected by using the pressure bushing, and the time difference between the movement of the pin and the push rod is utilized to automatically break the water gap of the interior panel when the interior panel is demolded. Thus, the subsequent water gap cutting process and equipment are not needed, the production efficiency is improved, and the production cost is reduced. However, the product is demolded by the pin, and pin marks, dents and deformation are easily generated on the product, affecting the appearance of the product. UTILITY MODEL CONTENTS
[0004] The utility model aims at overcoming the defects that pin marks, dents and deformation are easily generated on the product in the prior art, and provides a U type runner multi-cavity injection mold to avoid the generation of pin marks, dents and deformation on the surface of the product and improve the appearance quality of the product.
[0005] To solve the above technical problems, the utility model adopts the technical scheme of:
[0006] The utility model provides a U type runner multi -cavity injection mold, including front die and with front die cooperation rear die, be equipped with main runner on front die, still include submarine sprue insert and press mechanism, submarine sprue insert is equipped on front die, be equipped with submarine sprue runner in submarine sprue insert, press mechanism and front die sliding connection, when the mould closes, front die and press mechanism and rear die form product cavity and shunt between, main runner, shunt, submarine sprue runner and product cavity communicate in proper order, when the mould opens, press mechanism abuts on the nozzle of shunt formation.
[0007] The utility model discloses a U type runner multi -cavity injection mold, when the mould closes, front die and rear die adhere, and front die and press mechanism and rear die form product cavity and shunt, and main runner, shunt, submarine sprue runner and product cavity communicate in proper order, and the molten plastic flows to shunt through main runner, and then flows into product cavity through submarine sprue runner, and forms product. After product cooling, the rear die of machine table drives away from front die, and product is located on rear die, and at this moment, press mechanism always abuts on the nozzle of shunt formation, and the nozzle of forming is pressed on rear die, and at the same time, submarine sprue insert is away from rear die, and the shear force of press mechanism and submarine sprue insert is used to separate product and submarine sprue, and after separating, rear die keeps away from front die, and makes press mechanism separate with nozzle, and uses mechanical hand to take out product, and after product taking out, the nozzle falls from rear die automatically without external force. Through setting submarine sprue insert and press mechanism on front die, the separation of product and nozzle is realized, and product is taken out through mechanical hand, cancels rear die ejection system, reduces mould material and processing cost, and at the same time, avoids the defects such as ejector pin mark, dent, deformation on product surface, and improves product appearance quality.
[0008] Further, the press mechanism includes a driving member and a pressing assembly, the pressing assembly is connected with the output end of the driving member, and the pressing assembly is sealingly and slidably connected with the front die; when the mold is opened, the driving member drives the pressing assembly to abut on the nozzle formed by the shunt. The driving member drives the pressing assembly to move, and the submarine sprue insert provides the shear force for separating the product and the nozzle.
[0009] Further, the pressing assembly includes a locking block and a pressing piece, the locking block is connected with the output end of the driving member, the locking block is slidably connected with the front die, the pressing piece is connected with the locking block, and the pressing piece is sealingly and slidably connected with the front die; when the mold is closed, the front die and the pressing piece form the product cavity and the shunt between the front die and the rear die; when the mold is opened, the driving member drives the pressing piece to abut on the nozzle formed by the shunt. By setting the locking block, the replacement of the pressing piece is facilitated, and the locking block can also guide the movement of the pressing piece.
[0010] Further, the distribution channel comprises a first-level distribution channel, a second-level distribution channel and a third-level distribution channel communicated in sequence, the main flow channel communicates with the first-level distribution channel, and the submarine gate flow channel communicates with the third-level distribution channel. By arranging the multi-level distribution channel, the water gap ratio can be reduced on the basis of realizing one-out-multiple.
[0011] Further, the driving member is a spring, the locking block is connected with the spring, the pressing member comprises a reset block a connected with the locking block, the reset block a is in sealed sliding connection with the front mold core, the reset block a is located at the intersection of the first-level distribution channel and the second-level distribution channel, the first recess is arranged on the front mold core, and the second recess is arranged on the reset block a. When the mold is closed, the reset block a is in abutment against the rear mold core, and the first recess and the second recess are communicated to form part of the distribution channel. When the mold is closed, the reset block a is in abutment against the rear mold core to compress the spring, the molten plastic flows to the product cavity through the first recess and the second recess, and when the product and the water gap are formed, the reset block a is in abutment against the water gap, and the reset block a is arranged at the intersection of the first-level distribution channel and the second-level distribution channel, so that the water gap material is pressed towards the rear mold core.
[0012] Further, the pressing member further comprises a spring needle b connected with the locking block, the spring needle b is in sealed sliding connection with the front mold core, and the spring needle is located at the intersection of the second-level distribution channel and the third-level distribution channel. By arranging the spring needle b, the formed submarine gate water gap is pressed towards the rear mold core when the submarine gate insert is away from the rear mold core, so that the submarine gate water gap is separated from the product, and the water gap is also pressed on the rear mold core.
[0013] Further, the length of the main flow channel is not greater than the sliding distance of the reset block a. The main flow channel is shortened, so that the water gap formed by the main flow channel is separated from the front mold core by the elastic force of the spring.
[0014] Further, the distribution channel has a distribution channel cold material well, and the main flow channel has a main flow channel cold material well. By arranging the distribution channel cold material well and the main flow channel cold material well, the cold material is collected, the product is formed, and the product quality is improved.
[0015] Further, the main flow channel cold material well is located on the rear mold core, and the main flow channel cold material well is arranged in a semispherical structure. By arranging the main flow channel cold material well in a semispherical structure, the water gap is automatically separated from the rear mold core.
[0016] Further, the cross section of the distribution channel is semicircular, the curved surface of the distribution channel is located on the front mold core, and the plane of the distribution channel is located at the parting surface of the front mold core and the rear mold core. By arranging the cross section of the distribution channel in a semicircular shape, the water gap is automatically separated from the rear mold core.
[0017] Compared with the prior art, the utility model has the advantages that:
[0018] 1. The utility model discloses a U-shaped runner multi-cavity injection mold, through setting up the submarine gate insert, elastic part and compression mechanism in the former, realize the separation of product and water gap, and take out the product through the mechanical hand, cancel the back mold ejection system, reduce the mold material and processing cost, avoid the product surface to appear the pin mark, the pit, the deformation and so on defect simultaneously, improve the product appearance quality.
[0019] 2. The utility model discloses a U-shaped runner multi-cavity injection mold, the compression mechanism includes driving part, locking block, reset block a and elastic needle b, locking block installs the compression piece on the former kernel, can be convenient for the replacement of compression piece, and locking block can guide the movement of compression piece, driving part provides power for the movement of compression piece, reset block a and elastic needle b can be convenient for the water gap to be pressed on the back kernel when opening the mold.
[0020] 3. The utility model discloses a U-shaped runner multi-cavity injection mold, through shortening the main runner, the cross section of the branch runner is set as semicircle, the main runner cold material well is set as hemispherical structure, is convenient for the water gap to be separated from the back kernel automatically, makes the water gap not need ejection system and can be separated from the back automatically. BRIEF DESCRIPTION OF DRAWINGS
[0021] Figure 1 It is the structure schematic diagram of U-shaped runner multi-cavity injection mold;
[0022] Figure 2 It is the structure schematic diagram of U-shaped runner multi-cavity injection mold closing state;
[0023] Figure 3 It is the structure schematic diagram of U-shaped runner multi-cavity injection mold when the former core is separated from the product just;
[0024] Figure 4 It is the structure schematic diagram of U-shaped runner multi-cavity injection mold full opening and taking out state;
[0025] Figure 5 It is the runner layout process diagram of U-shaped runner multi-cavity injection mold.
[0026] In the drawing, 100, former kernel;110, first recess;200, back kernel;300, submarine gate insert;400, compression mechanism;410, driving part;420, compression assembly;421, locking block;422, compression piece;422a, reset block;422b, elastic needle;500, product cavity;600, branch runner;610, primary branch runner;611, branch runner cold material well;620, secondary branch runner;630, tertiary branch runner;700, main runner;710, main runner cold material well. DETAILED DESCRIPTION
[0027] The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only part of the embodiments of the present utility model, rather than all the embodiments. The present utility model will be further described below in combination with specific implementation manners. In the drawings, only for exemplary description, the drawings are only schematic views, rather than real object drawings, and should not be understood as a limitation on the present patent; in order to better illustrate the embodiments of the present utility model, some components in the drawings can be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions can be omitted in the drawings.
[0028] The same or similar reference numerals in the drawings of the embodiments of the present utility model correspond to the same or similar components; in the description of the present utility model, it should be understood that if the directions or position relationships indicated by the terms "upper", "lower", "left", "right" and the like are based on the directions or position relationships shown in the drawings, only for the convenience of describing the present utility model and simplifying the description, and the indicated devices or elements are not required to have a specific direction, to be constructed and operated in a specific direction, therefore, the terms describing the position relationships in the drawings are only for exemplary description, and should not be understood as a limitation on the present patent, for those skilled in the art, the specific meanings of the above terms can be understood according to the specific circumstances.
[0029] Embodiment one
[0030] The present embodiment is a first embodiment of a U-shaped runner multi-cavity injection mold, as shown in Figure 1 , comprising a front mold core 100 and a rear mold core 200 matched with the front mold core 100, the front mold core 100 is provided with a main runner 700, as shown in Figure 1 and Figure 2 , further comprising a submarine gate insert 300 and a pressing mechanism 400, the submarine gate insert 300 is arranged on the front mold core 100, the submarine gate insert 300 is provided with a submarine gate runner, the submarine gate runner is arranged obliquely from the branch runner 600 to the product towards the front mold core 100, the pressing mechanism 400 is in sliding connection with the front mold core 100, the sliding connection is a sealed sliding connection, that is, the molten plastic will not flow from between the pressing mechanism 400 and the front mold core 100 to the front mold core 100. When the mold is closed, the front mold core 100 and the pressing mechanism 400 form a product cavity 500 and a branch runner 600 with the rear mold core 200, the main runner 700, the branch runner 600, the submarine gate runner and the product cavity 500 are sequentially communicated; when the mold is opened, the pressing mechanism 400 abuts on the nozzle formed by the branch runner 600.
[0031] The compacting mechanism 400 comprises a driving member 410 and a compacting assembly 420, the compacting assembly 420 is connected with the output end of the driving member 410, and the compacting assembly 420 is sealingly and slidably connected with the front mold core 100; when the mold is closed, the product cavity 500 and the runner 600 are formed between the front mold core 100 and the compacting assembly 420 and the rear mold core 200; when the mold is opened, the driving member 410 drives the compacting assembly 420 to abut on the gate formed by the runner 600. The mold also comprises a front mold plate and a rear mold plate, and the driving member 410 can be arranged on the front mold plate or the front mold core 100. The compacting assembly 420 is driven to move by the driving member 410, and the shear force for separating the product and the gate is provided by cooperating with the submarine gate insert 300. The driving member 410 can be a driving member such as an electric push rod or an elastic member such as a spring, as long as it can form the runner between the compacting assembly 420 and the rear mold core 200 when the mold is closed, and always abut on the gate during the first stroke of opening the mold.
[0032] As shown in Figure 2 , the product injected in the embodiment is a PVC elbow pipe, the front mold core 100 is provided with a front mold core for inserting the product, that is, inserting one inlet of the PVC pipe, and the rear mold core 200 is provided with a rear mold core for inserting the product, that is, inserting the other inlet of the PVC pipe. As shown in Figure 2 and Figure 3 , when the first stroke of opening the mold is performed, the front mold core is separated from the product, and at this time the rear mold core is still inserted into the pipe, and the product is fixed on the rear mold core 200 by arranging the rear mold core. As shown in Figure 3 and Figure 4 , when the compacting mechanism 400 is separated from the gate, the rear mold core is separated from the product, and at this time the product can be taken out by the mechanical hand.
[0033] As shown in Figure 2 and Figure 5 , the runner 600 comprises a first-level runner 610, a second-level runner 620 and a third-level runner 630 which are sequentially communicated, the main runner 700 is communicated with the first-level runner 610, the submarine gate runner is communicated with the third-level runner 630, and the runner 600 is arranged as a U-shaped runner structure. By arranging the multi-level runner, the gate material ratio can be reduced on the basis of realizing one-out-multiple, and the quality of one-out-multiple products can also be ensured.
[0034] The runner 600 has a runner cold material well 611, and the main runner 700 has a main runner cold material well 710. Among them, the runner 600 has a runner cold material well 611, specifically, the first-level runner 610 and the second-level runner 620 both have a runner cold material well 611. By arranging the runner cold material well 611 and the main runner cold material well 710, the cold material is collected, which is convenient for product forming and improves product quality.
[0035] The working principle of the U-shaped runner multi-cavity injection mold of the embodiment is as follows:
[0036] When the mold is closed, the front mold core 100 is attached to the rear mold core 200, and the product cavity 500 and the runner 600 are formed between the front mold core 100 and the pressing mechanism 400 and the rear mold core 200. The main runner 700, the runner 600, the submarine gate runner, and the product cavity 500 are sequentially communicated. The molten plastic flows through the main runner 700 to the runner, and then flows into the product cavity 500 through the submarine gate runner to form a product. After the product is cooled, the machine drives the rear mold core 200 away from the front mold core 100, as shown in Figure 2 and Figure 3 shown, in the first stroke of mold opening, the rear mold core is still inserted in the product, and the product is located on the rear mold core 200. At this time, the pressing mechanism 400 always abuts on the runner 600 to form a nozzle, which presses the formed nozzle on the rear mold core 200. At the same time, the submarine gate insert 300 is away from the rear mold core 200. The shear force of the pressing mechanism 400 and the submarine gate insert 300 separates the product and the submarine gate. After separation, as shown in Figure 3 and Figure 4 shown, in the second stroke of mold opening, the rear mold core 200 continuously moves away from the front mold core 100, so that the pressing mechanism 400 is separated from the nozzle, and the rear mold core is extracted and separated from the product. The product is taken out by the mechanical hand. After the product is taken out, the nozzle automatically falls from the rear mold core 200 without external force. The separation of the product and the nozzle is realized by setting the submarine gate insert 300 and the pressing mechanism 400 in the front mold, and the product is taken out by the mechanical hand. The rear mold ejection system is cancelled, the mold material and processing cost are reduced, and the defects such as pin marks, dents, and deformation on the surface of the product are avoided, thereby improving the appearance quality of the product.
[0037] Embodiment Two
[0038] The second embodiment of the U-shaped runner multi-cavity injection mold is similar to the first embodiment, except that, as shown in Figure 2 the pressing assembly 420 includes a locking block 421 and a pressing piece 422. The locking block 421 is connected to the output end of the driving piece 410, and is slidingly connected to the front mold core 100. Specifically, a sliding groove is provided on the front mold core 100, and the locking block 421 is inserted into the sliding groove. When the mold is closed, the locking block 421 abuts on the front mold plate. When the mold is opened, the locking block 421 abuts on the bottom of the sliding groove, that is, the stroke of the driving piece 410 driving the pressing piece 422 is equal to the depth of the sliding groove.
[0039] The locking block 421 comprises a mounting plate and a fixing plate, and the pressing piece 422 is provided with a limiting head at one end. The mounting plate is provided with a through hole, and the pressing piece 422 is inserted into the through hole and the limiting head abuts against the mounting plate. The through hole can provide guidance for the installation of the pressing piece 422. The fixing plate is detachably connected with the mounting plate, and the two ends of the limiting head abut against the mounting plate and the fixing plate respectively, so that the fixing of the pressing piece 422 is realized. The fixing method is also convenient for disassembling and replacing the pressing piece 422.
[0040] As shown in Figure 3 and Figure 5 , the driving piece 410 is provided as a spring, and the length of the main flow channel 700 is not greater than the sliding distance of the reset block 422a, that is, when the spring is from the compressed state to the restored state, the water gap of the main flow channel 700 has been separated from the front mold core 100. Shortening the main flow channel 700 facilitates the separation of the water gap formed by the main flow channel 700 from the front mold core 100 through the elastic force of the spring.
[0041] The locking block 421 is connected with the spring, and the two ends of the spring abut against the locking block 421 and the front mold plate respectively. The pressing piece 422 comprises a reset block 422a connected with the locking block 421, and the reset block 422a is sealingly and slidably connected with the front mold core 100. The reset block 422a is located at the intersection of the first sub-flow channel 610 and the second sub-flow channel 620. The front mold core 100 is provided with a first recess 110, and the reset block 422a is provided with a second recess. The second recess is a cross-shaped recess, and the second recess is in communication with the first sub-flow channel 610 and the second sub-flow channel 620. When the mold is closed, the reset block 422a abuts against the rear mold core 200, and the first recess 110 and the second recess are in communication to form a part of the sub-flow channel. When the mold is closed, the reset block 422a abuts against the rear mold core 200 to compress the spring. The molten plastic flows to the product cavity 500 through the first recess 110 and the second recess. When the product and the water gap are formed, the reset block 422a abuts against the water gap. The reset block 422a is arranged at the intersection of the first sub-flow channel 610 and the second sub-flow channel 620, so as to facilitate the pressing of the water gap material towards the rear mold core 200.
[0042] As shown in Figure 3 and Figure 5 , the pressing piece 422 further comprises a spring needle 422b connected with the locking block 421. The spring needle 422b is sealingly and slidably connected with the front mold core 100. The spring needle 422 is located at the intersection of the second sub-flow channel 620 and the third sub-flow channel 630, and there is a gap between the spring needle 422 and the rear mold core 200, that is, the length of the spring needle 422 is shorter than that of the reset block 422a. Through the abutment of the reset block 422a and the rear mold core 200, the gap between the spring needle 422 and the rear mold core is realized, so as to facilitate the abutment of the spring needle on the surface of the water gap after the water gap is formed. By arranging the spring needle 422b, when the submarine gate insert 300 is away from the rear mold core 200, the formed submarine gate water gap is pressed towards the rear mold core 200, facilitating the separation of the submarine gate water gap from the product, and also facilitating the pressing of the water gap on the rear mold core 200.
[0043] Embodiment three
[0044] This embodiment is a third embodiment of the U-shaped runner multi-cavity injection mold. This embodiment is similar to Embodiment One, except that, as shown in Figure 2 the mold uses a lengthened nozzle to feed the glue, shortens the main runner 700, and facilitates the separation of the water gap formed by the main runner 700 from the front mold core 100.
[0045] As shown in Figure 5 the main runner cold well 710 is located on the back mold core 200, and the main runner cold well 710 is provided in a hemispherical structure. By providing the main runner cold well 710 in a hemispherical structure, the water gap can be automatically separated from the back mold core 200. At the same time, when the product is not taken out, the water gap stays on the back mold core 200 by relying on the product to support the submerged nozzle water gap and the back mold core 200 to support the main runner cold well 710.
[0046] As shown in Figure 5 the cross section of the branch runner 600 is provided in a semicircular shape, the curved surface of the branch runner 600 is located on the front mold core 100, and the flat surface of the branch runner 600 is located at the parting surface of the front mold core 100 and the back mold core 200. By providing the cross section of the branch runner 600 in a semicircular shape, the water gap can be separated from the back mold core 200.
[0047] Through the structural design of the water gap in this embodiment, when the mechanical hand takes out the product, the water gap can naturally fall off without the assistance of other mechanisms to separate the water gap from the mold.
[0048] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms is not necessarily directed to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, the skilled in the art can combine and combine the different embodiments or examples described in the present specification and the features of the different embodiments or examples without contradiction.
[0049] Obviously, the above embodiments of the present application are merely examples for clearly illustrating the present application, and are not intended to limit the implementation modes of the present application. For those skilled in the art, other different forms of changes or variations can be made on the basis of the above description. Here, it is not necessary and also impossible to exhaust all the implementation modes. Any modification, equivalent replacement and improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application claims.
Claims
1. A U-shaped runner multi-cavity injection mold comprising a front mold core (100) and a back mold core (200) matched with the front mold core (100), a main runner (700) is arranged on the front mold core (100), characterized in that, The application further comprises a submarine gate insert (300) and a pressing mechanism (400), wherein the submarine gate insert (300) is arranged on the front mold core (100), the submarine gate insert (300) is internally provided with a submarine gate runner, and the pressing mechanism (400) is in sliding connection with the front mold core (100); when the mold is closed, the front mold core (100) and the pressing mechanism (400) and the rear mold core (200) form a product cavity (500) and a runner (600), the main runner (700), the runner (600), the submarine gate runner and the product cavity (500) are sequentially communicated, and the pressing mechanism (400) abuts on a gate formed by the runner (600) when the mold is opened.
2. The U-channel multi-cavity injection mold of claim 1, wherein, The pressing mechanism (400) comprises a driving member (410) and a pressing assembly (420), the pressing assembly (420) is connected with the output end of the driving member (410), and the pressing assembly (420) is in sealed sliding connection with the front mold core (100); when the mold is opened, the driving member (410) drives the pressing assembly (420) to abut on the gate formed by the runner (600).
3. The U-channel multi-cavity injection mold of claim 2, wherein, The pressing assembly (420) comprises a locking block (421) and a pressing piece (422), the locking block (421) is connected with the output end of the driving member (410), the locking block (421) is in sliding connection with the front mold core (100), the pressing piece (422) is connected with the locking block (421), and the pressing piece (422) is in sealed sliding connection with the front mold core (100); when the mold is closed, the front mold core (100) and the pressing piece (422) and the rear mold core (200) form a product cavity (500) and a runner (600); when the mold is opened, the driving member (410) drives the pressing piece (422) to abut on the gate formed by the runner (600).
4. The U-channel multi-cavity injection mold of claim 3, wherein, The runner (600) comprises a first-level runner (610), a second-level runner (620) and a third-level runner (630) which are sequentially communicated, the main runner (700) is communicated with the first-level runner (610), and the submarine gate runner is communicated with the third-level runner (630).
5. The U-channel multi-cavity injection mold of claim 4, wherein, The driving member (410) is a spring, the locking block (421) is connected with the spring, the pressing piece (422) comprises a reset block (422a) connected with the locking block (421), the reset block (422a) is in sealed sliding connection with the front mold core (100), the reset block (422a) is located at the intersection of the first-level runner (610) and the second-level runner (620), the front mold core (100) is provided with a first groove (110), the reset block (422a) is provided with a second groove, the reset block (422a) abuts on the rear mold core (200) when the mold is closed, and the first groove (110) and the second groove are communicated to form part of the runner (600).
6. The U-channel multi-cavity injection mold of claim 5, wherein, The pressing piece (422) further comprises a spring needle (422b) connected with the locking block (421), the spring needle (422b) is in sealing sliding connection with the front die core (100), and the spring needle (422b) is located at the intersection of the secondary branch flow channel (620) and the tertiary branch flow channel (630).
7. The U-channel multi-cavity injection mold of claim 5, wherein, The length of the main flow channel (700) is not greater than the sliding distance of the reset block (422a).
8. The U-channel multi-cavity injection mold of any one of claims 1 to 6, wherein, The branch flow channel (600) has a branch flow channel cold material well (611), and the main flow channel (700) has a main flow channel cold material well (710).
9. The U-channel multi-cavity injection mold of claim 8, wherein, The main flow channel cold material well (710) is located on the rear die core (200), and the main flow channel cold material well (710) is provided in a semispherical structure.
10. The U-channel multi-cavity injection mold of any one of claims 1 to 6, wherein, The cross section of the branch flow channel (600) is provided in a semicircular shape, the curved surface of the branch flow channel (600) is located on the front die core (100), and the plane of the branch flow channel (600) is located at the parting surface of the front die core (100) and the rear die core (200).