A water cut-off structure in injection mold

Abstract

The utility model discloses an injection mold in-mold water outlet cut-off structure, comprising an upper mold core installed on an upper mold base and a lower mold core installed in a lower mold base, the upper mold core and the lower mold core are combined to form a product acupoint, a cutter that can be extended to the lower mold core is movably installed in the upper mold core, the cutter corresponds to the water outlet position of the lower mold core, a reset spring is provided between the cutter and the upper mold core, the purpose of cutting the water outlet material can be achieved by arranging the cutter and the reset spring at the upper mold core, and the mold structure will not be greatly affected, the stability is high, and the structure has a small number of parts, is easy to assemble, and has a low cost; when a part is damaged, it only needs to be disassembled from the upper mold core for replacement, which saves time and effort.

Description

Technical Field

[0001] The utility model belongs to the field of injection mold structures, in particular to an injection mold in-mold water cut-off structure. Background Art

[0002] Injection molds are important production tools for molding plastic products. After the injection molding of the injection molded parts, there will be a sprue. At this time, the sprue needs to be cut off before the injection molded parts can be collected and used. There are many ways to cut off the sprue. For example, the Chinese patent document "CN111452309A, an injection mold with a built-in sprue cutting knife" specifically sets a nozzle to introduce plastic into the mold cavity through the flow channel to form the injection molded parts, and then sets a hydraulic cylinder and a cutting knife under the lower mold, so that after the injection molded parts are formed, the hydraulic cylinder drives the cutting knife upward to cut off the sprue of the injection molded parts;

[0003] Although the above scheme can pre-cut the sprue of the injection molded part before the upper and lower molds are demolded, there is no need to cut the sprue after the injection molded part is taken out; however, a hydraulic cylinder needs to be installed inside, which will increase the production cost of the mold and affect the stability of the mold. Utility Model Content

[0004] The utility model aims to provide an injection mold in-mold water cut-off structure to solve the problems raised in the above-mentioned background technology.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] An injection mold in-mold water shut-off structure includes an upper mold core installed on an upper mold base and a lower mold core installed in a lower mold base. The upper mold core and the lower mold core are combined to form a product acupoint. A cutter that can be extended to the lower mold core is movably installed in the upper mold core. The cutter corresponds to the water outlet position of the lower mold core runner. A reset spring is provided between the cutter and the upper mold core.

[0007] A further technical solution is that a movable block and a reset rod are inserted into the lower mold core, a flow channel is provided on the upper end surface of the movable block, the water outlet position of the flow channel corresponds to the cutter, the reset rod corresponds to the end surface of the upper mold core, and the lower end surfaces of the movable block and the reset rod respectively contact the two ends of the swing block.

[0008] According to a further technical solution, a fulcrum protrusion is provided at the middle position of the bottom of the swing block.

[0009] According to a further technical solution, a through hole is provided in the middle of the swing block, and a ejector pin 1 is passed through the through hole. The ejector pin 1 penetrates the movable block and extends to the flow channel.

[0010] A further technical solution is that the lower mold base includes a lower mold frame, and an ejection mechanism is installed in the lower mold frame. The ejection mechanism includes a plurality of movable plate assemblies arranged in the lower mold frame, and a plurality of ejector pins are provided on the movable plate assembly. A plurality of return springs are provided between the movable plate assembly and the lower mold frame. A fixed plate is installed on the outer side of the lower mold frame, and at least two longitudinal limit strip holes are provided on the fixed plate. A limit rod is horizontally passed through the limit strip hole, and the limit rod is inserted into the movable plate assembly.

[0011] Beneficial effects of the utility model:

[0012] The utility model can achieve the purpose of cutting the water outlet material by arranging a cutter and a return spring at the upper die core without greatly affecting the mold structure, has high stability, and has a small number of parts, convenient assembly and low cost. When a part is damaged, it can be replaced by simply removing the upper die core, saving time and effort.

[0013] Other features and advantages of the present invention will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 : A three-dimensional structural diagram of the utility model.

[0015] Figure 2 : A top view of the utility model.

[0016] Figure 3 : The utility model Figure 2 BB cross-section diagram.

[0017] Figure 4 : The utility model cutter, movable block and reset rod disassembly distribution diagram.

[0018] Figure 5 : The cutter, movable block and reset rod structure diagram of the utility model.

[0019] Figure 6 : Schematic diagram of the action of the cutter, movable block and reset lever of the utility model.

[0020] Figure 7 : The utility model Figure 2 CC cross-section diagram.

[0021] Figure markings: 11-upper die base, 12-upper die core, 21-lower die base, 211-lower die frame, 212-movable plate assembly, 213-two ejector pins, 214-two return springs, 215-fixed plate, 216-limiting bar hole, 217-limiting rod, 218-one ejector pin, 22-lower die core, 31-cutter, 32-one return spring, 33-movable block, 34-reset rod, 35-flow channel, 36-swing block, 37-fulcrum protrusion, 38-groove, 39-through hole. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0023] Please refer to Figure 1-7 ;

[0024] The utility model is provided with a water cut-off structure in the injection mold, aiming to realize that the water cut-off structure can be simultaneously realized during the mold opening process, so as to facilitate the removal of the product;

[0025] Embodiment 1;

[0026] Specifically, it includes an upper mold core 12 installed on an upper mold base 11 and a lower mold core 22 installed in a lower mold base 21. The upper mold core 12 and the lower mold core 22 are combined to form a product acupuncture point. A cutter 31 that can extend to the lower mold core 22 is movably installed in the upper mold core 12. The cutter 31 corresponds to the water outlet position of the flow channel 35 of the lower mold core 22. A return spring 32 is arranged between the cutter 31 and the upper mold core 12. In the prior art, an injection inlet is arranged at the upper mold base 11, and a flow channel 35 is arranged inside the upper mold base 11 to extend to the acupuncture point, and the cutter 31 corresponds to the connection between the flow channel 35 and the acupuncture point.

[0027] When the upper mold base 11 is combined with the lower mold base 21, the end of the cutter 31 always presses against the end face of the lower mold core 22 and is at the connection between the flow channel 35 and the acupuncture point. After the injection molding of the product is completed, the upper mold base 11 rises and separates from the lower mold base 21. At the same time, the cutter 31 is pushed out from the upper mold core 12 under the action of the spring, and its end remains in a state of contact with the end face of the lower mold core 22. Of course, the length of the cutter 31 is limited. The cutter 31 only contacts the end face of the lower mold core 22 at a distance separated from the upper mold base 11 and the lower mold base 21; then the ejection mechanism in the injection mold extends from the lower mold core 22 to eject the product. Due to the misalignment between the product position and the flow channel 35 position, the sprue material is broken, that is, the separation of the product and the sprue material is achieved; when the upper mold base 11 and the lower mold base 21 are molded, the cutter 31 enters the upper mold core 12 again.

[0028] The utility model can achieve the purpose of cutting the sprue material 31 by only arranging a cutter 31 and a return spring 32 at the upper die core 12. Compared with the background technology that needs to use a hydraulic cylinder as a power source, the utility model is much simpler and will not have a significant impact on the mold structure. In addition, the utility model has a small number of parts, is easy to assemble, and has a low cost. When a part is damaged, it can be replaced by simply removing the upper die core 12, which saves time and effort.

[0029] Embodiment 2:

[0030] A movable block 33 and a reset rod 34 are provided in the lower mold core 22, wherein the movable block 33 and the reset rod 34 are arranged in parallel, and a flow channel 35 is provided on the upper end surface of the movable block 33, and the flow channel 35 is connected to the acupuncture point, that is, the position of the flow channel 35 where the water inlet material is located, and the water inlet position of the flow channel 35 corresponds to the cutter 31, and one side of the cutter 31 is close to the acupuncture point, and the reset rod 34 corresponds to the end surface of the upper mold core 12, and the lower end surfaces of the movable block 33 and the reset rod 34 respectively contact with the two ends of the swing block 36 to form a lever structure. In this embodiment, the two ends of the swing block 36 can swing up and down to push the reset rod 34 or the movable block 33 upward; in addition, the swing block 36 can be arranged in the lower mold core 22, and can also be arranged on other fixed plates 215 of the lower mold base 21. The final effect of the swing block 36 is that the two ends swing up and down with the middle part as the fulcrum, and the specific rotation method can be provided with a rotating shaft, etc.;

[0031] When the upper die seat 11 and the lower die seat 21 are in mold closing, the reset rod 34 and the movable block 33 are in a state of force balance, so no displacement occurs. When the upper die seat 11 and the lower die seat are in mold opening, the cutter 31 extends from the upper die core 12 under the action of the reset spring 1 32 and applies a downward force to the movable block 33. At this time, the upper end of the reset rod 34 is not subjected to force, so the movable block 33 moves downward, causing the flow channel 35 to be misaligned with the acupuncture point, that is, the flow channel 35 is misaligned with the product, thereby breaking the connection between the nozzle material and the product. Through such a structure, the connection between the cutter 31 product and the nozzle material can be achieved even if the product is not ejected;

[0032] When the movable block 33 moves downward, one end of the swing block 36 moves downward, and the other end moves upward, that is, the reset rod 34 is lifted upward and extends out of the end face of the lower mold core 22; when the mold is closed, the end face of the upper mold core 12 presses the reset rod 34 downward to reset the swing block 36, and at this time, the movable block 33 is also lifted upward and reset.

[0033] Furthermore, a fulcrum protrusion 37 is provided in the middle position at the bottom of the swing block 36, and a movable groove 38 should be provided at the position corresponding to the fulcrum protrusion 37. The position of the groove 38 varies according to the position of the swing block 36. In this embodiment, the position of the groove 38 is set in the other fixed plate 215 of the lower mold base 21.

[0034] In the present embodiment, a through hole 39 is provided in the middle of the swing block 36, and an ejector pin 218 is inserted in the through hole 39. The ejector pin 218 penetrates the movable block 33 and extends to the flow channel 35. When the product is cut off and separated from the nozzle material, the ejection mechanism ejects the product, and the ejector pin 218 also ejects the nozzle material located at the flow channel 35. It should be noted that at this time, the upper mold base 11 and the lower mold base 21 are separated by a distance, and the end of the cutter 31 does not conflict with the end surface of the movable block 33, so it will not hinder the nozzle material from being ejected from the flow channel 35. Since the swing block 36 needs to move left and right, the aperture of the through hole 39 is larger than the cross-sectional diameter of the ejector pin 218, so that the swing block 36 does not touch the ejector pin 218 when it moves.

[0035] In the embodiment of the utility model, the lower mold base 21 includes a lower mold frame 211, and an ejection mechanism is installed in the lower mold frame 211. The ejection mechanism includes a plurality of movable plate assemblies 212 arranged in the lower mold frame 211, and a plurality of ejector pins 213 are arranged on the movable plate assembly 212. A plurality of return springs 214 are arranged between the movable plate assembly 212 and the lower mold frame 211. A fixed plate 215 is installed on the outer side of the lower mold frame 211, and at least two longitudinal limit strip holes 216 are arranged on the fixed plate 215. The limit strip holes 216 A limit rod 217 is passed through the middle horizontally, and the limit rod 217 is inserted into the movable plate assembly 212; the movable plate assembly 212 is pushed upward by an external power assembly, and the reset spring 214 is compressed at the same time, so that the ejector pin 213 extends out of the lower mold core 22 to eject the product, and the upward movement distance of the movable plate assembly 212 is limited by the limit bar hole 216. After the ejection is completed, the movable plate assembly 212 is pushed downward by the action of the reset spring 214, and the ejector pin 213 is driven to reset.

[0036] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0037] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementations that can be understood by those skilled in the art.

Claims

1. An injection mold in-mold water shut-off structure, comprising an upper mold core (12) mounted on an upper mold base (11) and a lower mold core (22) mounted in a lower mold base (21), characterized in that: A cutter (31) is movably installed in the upper die core (12) and can extend toward the lower die core (22). The cutter (31) corresponds to the water outlet position of the flow channel (35) of the lower die core (22). A return spring (32) is provided between the cutter (31) and the upper die core (12).

2. The in-mold water cut-off structure of an injection mold according to claim 1, characterized in that: A movable block (33) and a reset rod (34) are provided in the lower die core (22); a flow channel (35) is provided on the upper end surface of the movable block (33); a water outlet position of the flow channel (35) corresponds to the cutter (31); the reset rod (34) corresponds to the end surface of the upper die core (12); and the lower end surfaces of the movable block (33) and the reset rod (34) respectively contact the two ends of the swing block (36).

3. The in-mold water cut-off structure of an injection mold according to claim 2, characterized in that: A fulcrum protrusion (37) is provided at the middle position of the bottom of the swing block (36).

4. The in-mold water cut-off structure of an injection mold according to claim 3, characterized in that: A through hole (39) is provided in the middle of the swing block (36), and a ejector pin (218) is inserted through the through hole (39). The ejector pin (218) penetrates the movable block (33) and extends to the flow channel (35).

5. An injection mold in-mold water shut-off structure according to any one of claims 1 to 4, characterized in that: The lower die base (21) comprises a lower die frame (211), an ejection mechanism is installed in the lower die frame (211), the ejection mechanism comprises a plurality of movable plate assemblies (212) arranged in the lower die frame (211), a plurality of ejector pins (213) are arranged on the movable plate assemblies (212), a plurality of return springs (214) are arranged between the movable plate assemblies (212) and the lower die frame (211), a fixed plate (215) is installed on the outer side of the lower die frame (211), at least two longitudinal limit bar holes (216) are arranged on the fixed plate (215), a limit rod (217) is horizontally penetrated in the limit bar hole (216), and the limit rod (217) is inserted into the movable plate assembly (212).

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