Novel injection mold sprue structure

Abstract

The invention relates to the technical field of injection molding material demolding, in particular to a novel injection mold sprue structure. The mold comprises a lower mold body and an upper mold body arranged on the upper side of the lower mold body, the lower mold body comprises a lower mold plate, two supporting plates are symmetrically and fixedly connected to the positions, close to the edge, of the lower surface of the lower mold plate, a bottom plate is fixedly connected to the lower surfaces of the two supporting plates, and a mounting cavity is defined by the bottom plate, the lower mold plate and the two supporting plates; the upper mold comprises an upper mold plate arranged on the upper side of the lower mold plate, and an injection molding mechanism is arranged on the upper mold plate. In the novel injection mold sprue structure, after a product is solidified and formed in the forming cavity, the ejector rod pressing plate drives the ejector rod fixing plate and the cutting ejector rod to vertically move upwards; the cutting-off ejector rod can cut off waste integrally solidified and formed on a product, workers do not need to cut off the waste after the product is demolded, the manufacturing cost of the product is reduced, the product cannot be accidentally damaged when the waste is cut off through the cutting-off ejector rod, and the quality of the product is improved.

Description

Technical Field

[0001] The invention relates to the technical field of demoulding of injection molding materials, in particular to a novel injection mold gate structure. Background Art

[0002] In the use of injection molds, products that require strength, such as housings, gaskets, brackets, etc., usually use high-strength resin materials such as PA66+GF, PBT+GFD to meet the functional requirements of the products. If a latent gate is used when injecting the injection material into the mold, either there is no space for the product, or the latent gate cannot meet the filling requirements of the product, forcing the injection pressure to increase, resulting in quality problems such as product deformation.

[0003] In order to avoid quality problems, a product 5 adopts a side gate for injection. Although it can meet the filling requirements of the injection material, part of the injection material will solidify into waste inside the gate. The waste is integrally formed with the product 5. Subsequently, a process of cutting the waste from the product 5 will be added, resulting in an increase in the manufacturing cost of the product 5 and reducing the product's competitive space in the market. In view of this, we propose a new injection mold gate structure. Summary of the invention

[0004] The purpose of the present invention is to provide a novel injection mold gate structure to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, a novel injection mold gate structure is provided, comprising a lower mold and an upper mold arranged on the upper side of the lower mold, the lower mold comprising a lower template, the lower surface of the lower template is symmetrically fixedly connected to two support plates near the edge, the lower surfaces of the two support plates are fixedly connected to a bottom plate, the bottom plate, the lower template and the two support plates are surrounded to form an installation cavity, the upper mold comprises an upper template arranged on the upper side of the lower template, an injection molding mechanism is arranged on the upper template, a lower mold core is fixedly connected to a side of the lower template close to the upper template, a runner is opened at the center of the top of the lower mold core, the injection molding mechanism is used to inject molten material into the runner, and two molding cavities are opened at the top of the lower mold core at both sides of the runner, a gate core is fixedly installed at both ends of the runner close to the two molding cavities, a runner gate is opened at a side wall of the gate core close to the top, the runner gate connects the corresponding molding cavity with the runner, and two products are respectively arranged in the two molding cavities;

[0006] An ejection groove is provided at the center position of the bottom of the runner, a cutting groove is provided at the bottom of the molding cavity near the runner, and three connecting grooves are provided on the lower template, and the three connecting grooves respectively connect the ejection groove and the two cutting grooves with the installation cavity, and a push rod pressure plate and a push rod fixing plate fixed on the upper surface of the push rod pressure plate are arranged inside the installation cavity, and a pushing mechanism for driving the push rod pressure plate to move vertically is arranged on the lower surface of the push rod pressure plate, a cutting ejector is slidably arranged in the cutting groove, and the lower end of the cutting ejector is fixedly arranged on the ejector fixing plate through the corresponding connecting groove, a gate ejector is slidably arranged in the ejection groove, and the lower end of the gate ejector extends into the installation cavity through the corresponding connecting groove, and a delay mechanism is arranged at the lower end of the gate ejector, and when the pushing mechanism drives the ejector pressure plate to move upward, the upper end of the cutting ejector moves into the corresponding molding cavity, and then the ejector pressure plate pushes the delay mechanism, so that the delay mechanism drives the gate ejector to move upward.

[0007] As a further improvement of the present technical solution, the delay mechanism includes a cavity opened at the top of the ejector pin pressure plate, a delay push plate is slidably arranged in the cavity, four extension rods are fixedly connected to the lower surface of the delay push plate near the four corners, the lower ends of the extension rods pass through the lower side of the cavity and extend out, and the lower end of the gate ejector pin passes through the ejector pin fixing plate and is fixedly arranged on the upper surface of the delay push plate.

[0008] As a further improvement of the technical solution, when the upper end of the cutting push rod is set in the cutting groove, the lower end of the extension rod contacts the upper surface of the bottom plate, and a gap is left between the lower surface of the delay push plate and the bottom surface inside the cavity.

[0009] As a further improvement of the present technical solution, an undercut groove is provided at the upper end of the gate ejector pin, and one side of the undercut groove is set as an inclined surface, and the lower end of the inclined surface is close to the axis of the gate ejector pin. After the injection molding melt contacts and solidifies with the undercut groove, a bayonet mechanism is formed between the undercut groove and the solidified injection molding melt. When the delay mechanism drives the gate ejector pin to move upward, the undercut groove extends to the upper side of the runner.

[0010] As a further improvement of the technical solution, the runner gate gradually narrows toward the end connected to the molding cavity, and the upper end surface of the runner gate and the upper surface of the lower mold core form an angle of 15 to 30 degrees.

[0011] As a further improvement of the technical solution, the gate core is arranged in the cutting groove near the lower end, and the side of the gate core away from the ejection groove is in sliding contact with the cutting ejector rod.

[0012] As a further improvement of the present technical solution, the injection molding mechanism includes a gate sleeve fixedly connected to the center position of the upper mold plate, the upper mold plate is fixedly connected to the side close to the lower mold plate with an upper mold core, the molding cavity is arranged between the upper mold core and the lower mold core, and the lower end of the gate sleeve passes through the upper mold core and is connected to the runner.

[0013] As a further improvement of the technical solution, a plurality of embedded grooves are opened on the bottom plate, and the pushing mechanism includes a hydraulic cylinder fixedly arranged inside the embedded groove, and the upper end of the hydraulic cylinder piston rod is fixedly arranged on the lower surface of the push rod pressure plate.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. In the new injection mold gate structure, after the product is solidified inside the molding cavity, the ejector pressure plate drives the ejector fixing plate and the cutting ejector to move vertically upward, so that the cutting ejector can cut off the solidified waste on the product. Workers do not need to cut the waste after the product is demolded, which reduces the production cost of the product. The cutting ejector will not accidentally damage the product when cutting off the waste, thereby improving the quality of the product.

[0016] 2. In the new injection mold gate structure, after the cutting ejector pin separates the product and the waste, the upward ejector pressure plate contacts the delayed push plate, so that the ejector pressure plate drives the delayed push plate and the gate ejector pin to move vertically upward, and then the gate ejector pin ejects the waste from the runner and runner gate, thereby quickly cleaning the waste and enabling workers to quickly carry out the next injection molding process, thereby improving the production efficiency of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0018] Figure 2 A cross-sectional view of the overall structure of the present invention;

[0019] Figure 3 It is a structural schematic diagram of the lower mold of the present invention;

[0020] Figure 4 One of the cross-sectional views of the lower mold of the present invention;

[0021] Figure 5 The second cross-sectional view of the lower mold of the present invention;

[0022] Figure 6 For the present invention Figure 5 A magnified view of the structure at center A;

[0023] Figure 7 It is a partial structural cross-sectional view of the lower mold of the present invention;

[0024] Figure 8 It is a partial structural exploded view of the lower mold of the present invention;

[0025] Fig. 9 It is a schematic structural diagram of the gate ejector rod and ejector groove combination and the cutting ejector rod and cutting groove combination of the present invention;

[0026] Fig.10 It is a schematic diagram of the structure of the ejection groove, the cutting groove and the flow channel of the present invention;

[0027] Fig.11 It is a schematic diagram of the structure of the gate ejector, the cutting ejector and the ejector fixing plate after being combined in the present invention;

[0028] Fig.12 It is a schematic structural diagram of the delayed push plate and the gate ejector rod of the present invention.

[0029] The meaning of each number in the figure is:

[0030] 1. Lower mold plate; 11. Support plate; 12. Bottom plate; 13. Lower mold core; 131. Runner; 132. Ejector groove; 133. Cutting groove; 134. Forming cavity; 14. Hydraulic cylinder;

[0031] 2. Upper mold plate; 21. Sprue bushing; 22. Upper mold core;

[0032] 3. Ejector plate; 31. Cavity;

[0033] 4. Top rod fixing plate;

[0034] 5. Products;

[0035] 6. Delayed push plate; 61. Extension rod;

[0036] 7. Gate ejector; 71. Undercut groove;

[0037] 8. Cut off the top rod;

[0038] 9. Gate core; 91. Runner gate. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0041] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0042] Example 1

[0043] See also Figure 1-Figure 12As shown, a novel injection mold gate structure is provided, including a lower mold and an upper mold arranged on the upper side of the lower mold, the lower mold includes a lower mold plate 1, the upper mold includes an upper mold plate 2 arranged on the upper side of the lower mold plate 1, an injection molding mechanism is arranged on the upper mold plate 2, a lower mold core 13 is fixedly connected to a side of the lower mold plate 1 close to the upper mold plate 2, a flow channel 131 is provided at the center position of the top of the lower mold core 13, the injection molding mechanism is used to inject molten material into the flow channel 131, the injection molding mechanism includes a gate sleeve 21 fixedly connected to the center position of the upper mold plate 2, an upper mold core 22 is fixedly connected to a side of the upper mold plate 2 close to the lower mold plate 1, and two molding cavities 134 are provided at the top of the lower mold core 13 at both sides of the flow channel 131, the molding cavity 134 is arranged between the upper mold core 22 and the lower mold core 13, the lower end of the gate sleeve 21 passes through the upper mold core 22 and is connected to the flow channel 131, and the flow channel 131 is fixedly installed at both ends close to the two molding cavities 134. The gate core 9 has a runner gate 91 formed on its side wall near the top. The runner gate 91 connects the corresponding molding cavity 134 with the runner 131. After the molten injection material is injected into the runner 131 through the gate sleeve 21, the injection material flows into the two molding cavities 134 through the two runner gates 91 respectively. The injection material solidifies inside the molding cavity 134 to form a product 5. The two products 5 are respectively arranged in the two molding cavities 134. The lower template 1 is arranged on an external moving platform. The upper template 2 is suspended on one side of the lower template 1 through an external bracket. When the product 5 is solidified and formed inside the molding cavity 134, the moving platform drives the lower template 1 away from the upper template 2. The upper template 2 remains stationary on the bracket, so that the lower template 1 and the upper template 2 can be separated, and the molding cavity 134 and the product 5 therein are exposed to the external environment, so that the machine can eject the product 5 from the molding cavity 134.

[0044] When the injection molding material entering the molding cavity 134 solidifies into the product 5, the injection molding material remaining in the runner 131 and the runner gate 91 will also solidify. At this time, the injection molding material solidified in the runner 131 and the runner gate 91 becomes waste. The waste connects the two products 5. In the subsequent processing, after the workers collect the finished products 5 together, they need to cut the waste from the product 5 to separate the two products 5. However, the step of cutting the waste will increase the production cost of the product 5. At the same time, the subsequent cutting of the waste is likely to damage the product 5, thereby reducing the yield rate of the product 5. To solve this problem, two support plates 11 are symmetrically fixedly connected to the lower surface of the lower template 1 near the edge. The lower surface of the plate 11 is fixedly connected with a bottom plate 12, and the bottom plate 12 is fixedly arranged on the upper surface of the mobile platform. The bottom plate 12, the lower template 1 and the two support plates 11 are surrounded to form an installation cavity. At the same time, an ejection groove 132 is opened at the center position of the bottom of the flow channel 131, and a cutting groove 133 is opened at the bottom of the molding cavity 134 near the flow channel 131. Three connecting grooves are opened on the lower template 1, and the three connecting grooves respectively connect the ejection groove 132 and the two cutting grooves 133 with the installation cavity. A push rod pressing plate 3 and a push rod fixing plate 4 fixed on the upper surface of the push rod pressing plate 3 are arranged inside the installation cavity. The lower surface of the push rod pressing plate 3 is provided with a pushing mechanism for driving the push rod pressing plate 3 to move along the axial direction of the cutting groove 133. Figure 2 , a plurality of embedded grooves are provided on the bottom plate 12, and the pushing mechanism includes a hydraulic cylinder 14 fixedly arranged inside the embedded groove, the upper end of the piston rod of the hydraulic cylinder 14 is fixedly arranged on the lower surface of the ejector plate 3, and a cutting ejector rod 8 is slidably arranged in the cutting groove 133, and the lower end of the cutting ejector rod 8 is fixedly arranged on the ejector plate 4 through the corresponding connecting groove. When the product 5 and the waste material are both solidified and formed, the piston rod of the hydraulic cylinder 14 is extended to drive the ejector plate 3 to move upward, and the ejector plate 3 drives the ejector plate 4 and the cutting ejector rod 8 to move upward. When the upper end of the cutting ejector rod 8 moves to the corresponding molding cavity 134 to contact the product 5, the cutting ejector rod 8 pushes the product 5 upward, so that the connection between the product 5 and the waste material is subjected to a large shear force until the product 5 and the waste material in the flow channel 131 are cut off and separated, so as to cut the waste material on the product 5 in the mold, and the workers do not need to cut the waste material after the product 5 is demolded, thereby reducing the production cost of the product 5.

[0045] At the same time, the position of the gate core 9 near the lower end is set in the cutting groove 133, and the side of the gate core 9 away from the ejection groove 132 is in sliding contact with the cutting ejector rod 8. Therefore, when the upper end of the cutting ejector rod 8 moves upward along the side wall of the gate core 9, the cutting ejector rod 8 can accurately cut off and separate the product 5 located in the molding cavity 134 and the waste located in the runner 131 and the runner gate 91, so that the cutting ejector rod 8 will not accidentally damage the product 5, thereby improving the quality of the product 5.

[0046] When the cutting ejector rod 8 cuts off the waste on the product 5, the cutting ejector rod 8 easily ejects the product 5 from the molding cavity 134, and ejects the waste from the inside of the runner 131, making it impossible to cut off the waste from the product 5. To solve this problem, a gate ejector rod 7 is slidably arranged in the ejection groove 132, and the lower end of the gate ejector rod 7 extends to the installation cavity through the corresponding connecting groove. When the cutting ejector rod 8 moves upward, the runner gate 7 restricts the waste from moving out of the runner 131, thereby making the waste restrict the gate ejector rod 7 from moving out of the runner 131. 7 moves, and at the same time, an undercut groove 71 is opened at the upper end of the gate ejector 7, one side of the undercut groove 71 is set as an inclined surface, and the lower end of the inclined surface is close to the axis of the gate ejector 7. When the injection molding material enters the flow channel 131, the injection molding melt contacts and solidifies with the undercut groove 71, and a bayonet mechanism is formed between the undercut groove 71 and the solidified injection molding melt. When the cutting ejector 8 cuts off the waste on the product 5, the bayonet mechanism pulls the waste so that the waste cannot be moved out of the flow channel 131, so that the cutting ejector 8 can smoothly cut off the waste on the product 5.

[0047] When the waste material is cut off from the product 5 by the cutting ejector rod 8, the waste material is retained in the flow channel 131. In order to facilitate the removal of the waste material in the flow channel 131, a delay mechanism is provided at the lower end of the gate ejector rod 7. Figure 6 and Figure 7 The delay mechanism includes a cavity 31 opened at the top of the ejector plate 3, a delay push plate 6 is slidably arranged in the cavity 31, and four extension rods 61 are fixedly connected to the lower surface of the delay push plate 6 near the four corners. The lower ends of the extension rods 61 pass through the lower side of the cavity 31 and extend out. The lower end of the gate ejector 7 passes through the ejector fixing plate 4 and is fixedly arranged on the upper surface of the delay push plate 6. When the upper end of the cutting ejector 8 is arranged in the cutting groove 133, the lower end of the extension rod 61 contacts the upper surface of the bottom plate 12, and the extension rod 61 supports the delay push plate 6, so that a gap is left between the lower surface of the delay push plate 6 and the bottom surface inside the cavity 31. When the ejector plate 3 drives the cutting ejector 8 to cut off the waste, the gate ejector 7 and the delay push plate 6 remain stationary. The distance between the bottom surface of the cavity 31 and the delayed push plate 6 is reduced. After the waste material is cut off from the product 5 by the cutting ejector pin 8, the bottom surface of the cavity 31 contacts the lower surface of the delayed push plate 6. At this time, the upward ejector plate 3 pushes the delayed push plate 6 and the gate ejector pin 7 to move, and moves the upper end of the gate ejector pin 7 to the runner 131. The moving gate ejector pin 7 pushes the waste material in the runner 131 upward to separate the waste material from the runner 131. When the undercut groove 71 extends to the upper side of the runner 131, the waste material falls under the action of gravity, so that the part of the waste material located in the undercut groove 71 is moved out of the undercut groove 71, thereby realizing the rapid cleaning of the waste material, enabling the machine to quickly carry out the next injection molding process, and improving the production efficiency of the product 5.

[0048] In order to improve the quality of the injection molded product 5 in the prior art, the runner gate 91 is set to be approximately conical in shape, that is, the runner gate 91 gradually narrows toward the end connected to the molding cavity 134, and the angle between the upper side of the runner gate 91 and the horizontal plane is commonly set to 0-5 degrees. When the gate ejector 7 pushes the waste upward, the part of the waste located in the runner gate 91 will first cooperate with the upper side of the runner gate 91 to limit the upward movement of the waste. However, as the lifting force of the gate ejector 7 increases, the part of the waste located in the runner gate 91 will undergo elastic deformation. When the deformed waste part is squeezed out from the runner gate 91, the waste will rebound quickly and then fly out of the runner 131, causing inconvenience to the collection and treatment of the waste. To solve this problem, the upper end surface of the runner gate 91 and the upper surface of the lower mold core 13 form an angle of 15 to 30 degrees. When the elastically deformed local waste is squeezed out from the runner gate 91, the elastic force generated by the rebound of the waste is not enough to make the waste fly, so that the waste pushed out of the runner 131 by the gate ejector rod 7 stays on the upper end of the gate ejector rod 7, which is convenient for the collection and treatment of the waste.

[0049] When the device is used, the lower mold and the upper mold are both placed horizontally. After the two products 5 are solidified and formed in the two molding cavities 134 respectively, the worker starts the mobile platform to separate the lower mold plate 1 and the upper mold plate 2, and then extends the piston rod of the hydraulic cylinder 14 to push the ejector plate 3, the ejector fixing plate 4 and the cutting ejector 8 to move in the direction close to the runner 131. Since the upper end surface of the runner gate 91 and the upper surface of the lower mold core 13 form an angle of 15 to 30 degrees, the edge of the runner gate 91 near the cutting ejector 8 forms a sharp end surface. When the upwardly moved cutting ejector 8 pushes the product 5 to deform the product 5, the product 5 will squeeze the sharp edge of the runner gate 91, so that the runner gate 91 removes the waste from the product The waste material is cut off and separated on the product 5, and then the upward ejector pressure plate 3 contacts the delayed push plate 6, so that the delayed push plate 6 drives the gate ejector 7 to move upward, and the upward gate ejector 7 ejects the waste from the runner 131 and the runner gate 91. The runner gate 91 limits the elastic deformation amplitude of the waste material when the waste material is ejected from the runner 131, and prevents the waste material from flying due to excessive rebound force, thereby increasing the difficulty of collecting and processing the waste material. When the undercut groove 71 on the gate ejector 7 moves to one side of the runner 131, the gate ejector 7 completely ejects the waste material from the runner 131. At this time, the waste material falls downward under the action of gravity, and the part of the waste material located in the undercut groove 71 automatically falls out of the undercut groove 71, thereby realizing rapid cleaning of the waste material.

[0050] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A novel injection mold gate structure, comprising a lower mold and an upper mold arranged on the upper side of the lower mold, the lower mold comprising a lower mold plate (1), two support plates (11) are symmetrically fixedly connected to the lower surface of the lower mold plate (1) near the edge, the lower surfaces of the two support plates (11) are fixedly connected to a bottom plate (12), the bottom plate (12), the lower mold plate (1) and the two support plates (11) are surrounded to form an installation cavity, characterized in that: The upper mold comprises an upper mold plate (2) arranged on the upper side of the lower mold plate (1), an injection molding mechanism is arranged on the upper mold plate (2), a lower mold core (13) is fixedly connected to a side of the lower mold plate (1) close to the upper mold plate (2), a flow channel (131) is provided at the center position of the top of the lower mold core (13), the injection molding mechanism is used to inject molten material into the flow channel (131), and two molding cavities (134) are provided at the top of the lower mold core (13) at both sides of the flow channel (131), a gate core (9) is fixedly installed at both ends of the flow channel (131) close to the two molding cavities (134), a flow channel gate (91) is provided at a position close to the top of the side wall of the gate core (9), the flow channel gate (91) connects the corresponding molding cavity (134) with the flow channel (131), and two products (5) are respectively arranged in the two molding cavities (134); An ejection groove (132) is provided at the center of the bottom of the flow channel (131), a cutting groove (133) is provided at the bottom of the molding cavity (134) near the flow channel (131), three connecting grooves are provided on the lower mold plate (1), and the three connecting grooves respectively connect the ejection groove (132) and the two cutting grooves (133) with the installation cavity, a push rod pressure plate (3) and a push rod fixing plate (4) fixed on the upper surface of the push rod pressure plate (3) are provided inside the installation cavity, a pushing mechanism for driving the push rod pressure plate (3) to move vertically is provided on the lower surface of the push rod pressure plate (3), and the cutting groove (13 A cutting ejector rod (8) is slidably arranged in the mold (3), and the lower end of the cutting ejector rod (8) is fixedly arranged on the ejector rod fixing plate (4) through a corresponding connecting groove. A gate ejector rod (7) is slidably arranged in the ejection groove (132), and the lower end of the gate ejector rod (7) extends into the installation cavity through the corresponding connecting groove. A delay mechanism is arranged at the lower end of the gate ejector rod (7). When the pushing mechanism drives the ejector rod pressure plate (3) to move upward, the upper end of the cutting ejector rod (8) moves into the corresponding molding cavity (134), and then the ejector rod pressure plate (3) pushes the delay mechanism, so that the delay mechanism drives the gate ejector rod (7) to move upward.

2. The new injection mold gate structure according to claim 1 is characterized in that: The delay mechanism comprises a cavity (31) opened at the top of the ejector plate (3), a delay push plate (6) is slidably arranged in the cavity (31), four extension rods (61) are fixedly connected to the lower surface of the delay push plate (6) near the four corners, the lower ends of the extension rods (61) pass through the lower side of the cavity (31) and extend out, and the lower end of the gate ejector (7) passes through the ejector fixing plate (4) and is fixedly arranged on the upper surface of the delay push plate (6).

3. The new injection mold gate structure according to claim 2 is characterized in that: When the upper end of the cutting push rod (8) is disposed in the cutting groove (133), the lower end of the extension rod (61) contacts the upper surface of the bottom plate (12), and a gap is left between the lower surface of the delay push plate (6) and the bottom surface inside the cavity (31).

4. The novel injection mold gate structure according to claim 1 is characterized in that: The upper end of the gate push rod (7) is provided with an undercut groove (71), one side of the undercut groove (71) is arranged as an inclined surface, the lower end of the inclined surface is close to the axis of the gate push rod (7), after the injection molding melt contacts and solidifies with the undercut groove (71), a bayonet mechanism is formed between the undercut groove (71) and the solidified injection molding melt, and when the delay mechanism drives the gate push rod (7) to move upward, the undercut groove (71) extends to the upper side of the runner (131).

5. The novel injection mold gate structure according to claim 1 is characterized in that: The runner gate (91) gradually narrows toward the end connected to the molding cavity (134), and the upper end surface of the runner gate (91) and the upper surface of the lower mold core (13) form an angle of 15 to 30 degrees.

6. The novel injection mold gate structure according to claim 1 is characterized in that: The gate core (9) is arranged in the cutting groove (133) near the lower end, and the side of the gate core (9) away from the ejection groove (132) is in sliding contact with the cutting ejector rod (8).

7. The novel injection mold gate structure according to claim 1 is characterized in that: The injection molding mechanism comprises a sprue sleeve (21) fixedly connected to the center position of the upper mold plate (2); an upper mold core (22) is fixedly connected to the side of the upper mold plate (2) close to the lower mold plate (1); the molding cavity (134) is arranged between the upper mold core (22) and the lower mold core (13); and the lower end of the sprue sleeve (21) passes through the upper mold core (22) and is connected to the runner (131).

8. The novel injection mold gate structure according to claim 1 is characterized in that: The bottom plate (12) is provided with a plurality of embedded grooves, and the pushing mechanism comprises a hydraulic cylinder (14) fixedly arranged inside the embedded groove, and the upper end of the piston rod of the hydraulic cylinder (14) is fixedly arranged on the lower surface of the push rod pressure plate (3).

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