Intra-mold water gap cutting structure of injection mold

Abstract

The utility model discloses an in-mold water gap cutting structure of an injection mold. The in-mold water gap cutting structure comprises a first mold base and a second mold base which are matched for use, a first mold core is installed in the first mold base, a movable first cutter is installed at the position close to the water gap, and an elastic assembly is installed on the first cutter. A second mold core is installed in the second mold base, a movable second cutter is installed at the position close to the water gap, the second cutter abuts against the first cutter, and the end face, close to the first cutter, of the second cutter is provided with a runner communicated with the water gap; a limiting structure used for controlling the second cutter to move is further arranged, the limiting structure can push the second cutter to reset, and the position of the runner and the position of the mold cavity are staggered on the basis of the process, so that the water gap is cut off, then the first mold core and the second mold core are separated, and the product is cut off from the water gap when ejected out; in the process, the normal mold opening time is not influenced, and the subsequent production steps can be simplified.

Description

Technical Field

[0001] The utility model belongs to the technical field of injection mold structure improvement, in particular to an injection mold in-mold water nozzle 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 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 runner to form the injection molded parts. Then, a hydraulic cylinder and a cutting knife are set under the lower mold. 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] The above solution can realize pre-cutting of the sprue of the injection molded part before the upper mold and the lower mold are demoulded, without the need to cut the sprue after the injection molded part is taken out; the present application proposes another structure for cutting the sprue in the mold. Utility Model Content

[0004] The purpose of the utility model is to provide an in-mold gate structure for an injection mold to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above objectives, the present invention provides the following technical solutions:

[0006] An in-mold gate structure for an injection mold comprises a first mold base and a second mold base used in conjunction with each other;

[0007] A first mold core is installed in the first mold base, a movable first cutter is installed near the water inlet, and an elastic component is installed on the first cutter;

[0008] A second mold core is installed in the second mold base, and a movable second cutter is installed near the water outlet. The second cutter contacts the first cutter, and the end surface of the second cutter close to the first cutter is provided with a flow channel connected to the water outlet.

[0009] A limiting structure for controlling the movement of the second cutter is also provided, and the limiting structure can push the second cutter to reset.

[0010] A further technical solution is that the limiting structure includes a limiting slider 1, the limiting slider 1 passes through the second cutter, and one end of the limiting slider 1 can be connected to an external power component, and a clearance position 1 is provided on the side of the limiting slider 1 close to the first cutter, the clearance position 1 can correspond to the position of the second cutter, and a slope is provided on one side of the clearance position 1.

[0011] A further technical solution is that the limiting structure includes an adjusting fixing strip, one end of which is fixed to the upper mold base, and the other end is inserted into the lower mold base. The side of the adjusting fixing strip close to the limiting slider is provided with a concave-convex surface, and the concave-convex surface is abutted against the end of the limiting slider, and the external power component is an elastic part.

[0012] A further technical solution is provided above the limiting slider 1 with a limiting slider 2, the limiting slider 2 passes through the second cutter, and the limiting slider 2 is provided with a second avoidance position and a third avoidance position, the elastic component can penetrate into the second avoidance position, the second avoidance position is provided with an inclined surface, the avoidance position 3 can correspond to the position of the second cutter, and one side of the avoidance position 3 is provided with an inclined surface.

[0013] One end of the second limiting slider is provided with a second elastic member, and the adjusting and fixing strip is provided with a second concave-convex surface which abuts against the end of the second limiting slider.

[0014] A further technical solution is that the elastic component includes a movable block, which is fixedly connected to the first cutter and the pressure rod respectively. The pressure rod is provided with an elastic part three, which abuts the movable block and the upper mold base respectively, and the end of the pressure rod abuts against the limiting slider two.

[0015] According to a further technical solution, a pressure block is provided at the end of the pressure rod, and a slope adapted to the second avoidance position is provided on one side of the pressure block.

[0016] According to a further technical solution, the second cutter is provided with an ejection channel extending to the flow channel, and an ejector pin is passed through the ejector.

[0017] Beneficial effects of the utility model:

[0018] When the first module and the second module move away from each other, the first cutter and the second cutter maintain contact with each other under the action of the elastic component, and at the same time, the limiting structure releases the position limit of the second cutter. At this time, the first cutter is pushed toward the second cutter under the action of the elastic component, that is, the first cutter and the first mold core move relative to each other, and at the same time, the second cutter and the second mold core are pushed to move relative to each other. Based on the above process, the flow channel position and the mold cavity position are misaligned, thereby cutting off the sprue. After that, the first mold core and the second mold core are separated, and the product is cut off from the sprue when it is ejected. In this process, it does not affect the normal mold opening time and can also simplify subsequent production steps.

[0019] Other features and advantages of the present invention will be described in detail in the subsequent detailed description of the embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 : A three-dimensional structural diagram of the utility model.

[0021] Figure 2: The utility model Figure 1 Magnified view of part A.

[0022] Figure 3 : Internal structure diagram of the utility model.

[0023] Figure 4 : Schematic diagram of the action process of the present utility model.

[0024] Figure markings: 11-first mold core, 12-first cutter, 13-elastic component, 131-movable block, 132-pressure rod, 133-pressure block, 21-second mold core, 22-second cutter, 23-flow channel, 24-ejection channel, 3-limiting structure, 31-limiting slider one, 32-avoidance position one, 33-adjusting fixing strip, 34-concave and convex surface one, 35-limiting slider two, 36-avoidance position two, 37-concave and convex surface two, 38-avoidance position three. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present invention.

[0026] Please refer to Figure 1-4 ;

[0027] The utility model aims to realize the simultaneous cutting of the nozzle when the mold is opened, so as to facilitate the removal of the product. Specifically, it comprises a first mold base (not shown) and a second mold base used in conjunction with each other; a first mold core 11 is installed in the first mold base, and a movable first cutter 12 is installed near the nozzle, and an elastic component 13 is installed on the first cutter 12; a second mold core 21 is installed in the second mold base (not shown), and a movable second cutter 22 is installed near the nozzle, and the second cutter 22 interferes with the first cutter 12;

[0028] The following describes the initial state of mold closing. The first mold core 11 and the second mold core 21 combine to form a mold cavity. Raw material is injected into the mold cavity. The raw material needs to pass through the runner 23 before entering the mold cavity. After cooling, a product is formed in the mold cavity. At this time, the product in the mold cavity and the raw material in the runner 23 are connected together. The position between the product and the solidified raw material in the runner 23 is called the sprue. This structure is designed to cut off this position.

[0029] In this embodiment, the end surface of the second cutter 22 close to the first cutter 12 is provided with a flow channel 23 connected to the water outlet. When the first die set and the second die set are away from each other, the first cutter 12 and the second cutter 22 are kept in contact with each other under the action of the elastic component 13. At the same time, the limiting structure 3 releases the position limit of the second cutter 22. At this time, the first cutter 12 is pushed toward the second cutter 22 under the action of the elastic component 13, that is, the first cutter 12 and the first mold core 11 move relative to each other, and at the same time, the second cutter 22 and the second mold core 21 are pushed relative to each other. It should be noted that , there should be a stripper plate in the first mold base. When the first mold base is separated from the second mold base, the separation of the first mold core 11 and the second mold core 21 is delayed due to restrictions such as the stripper plate; based on the above process, the position of the runner 23 is misaligned with the position of the mold cavity, thereby cutting off the sprue, and then the first mold core 11 and the second mold core 21 are separated, and the product is cut off from the sprue when it is ejected. In this process, the normal mold opening time will not be affected, and subsequent production steps can also be simplified; after the mold is closed again, the limiting structure 3 pushes the second cutter 22 to reset, and at the same time pushes the first cutter 12 to reset.

[0030] Preferably, the second cutter 22 is provided with an ejection channel 24 extending to the runner 23 , and an ejector pin is passed through the ejector. After the water outlet is cut off, the mold is opened, and the second cutter 22 can be extended to eject the solidified raw material from the runner 23 according to customization.

[0031] One embodiment of the position-limiting structure 3 of the present invention specifically includes a limiting slider 31, which passes through the second cutter 22, and one end of the limiting slider 31 can be connected to an external power component. In this embodiment, the external power component can be a cylinder, etc., and a clearance position 32 is provided on the side of the limiting slider 31 close to the first cutter 12. In this embodiment, the width of the clearance position 32 is greater than or equal to the width of the cutter, the clearance position 32 can correspond to the position of the second cutter 22, and a slope is provided on one side of the clearance position 32; in the initial state, the clearance position 32 is provided with a slope. The space avoidance position 32 is offset from the cutter, and the flow channel 23 corresponds to the mold cavity. When the mold is opened, the limiting slider 31 slides under the action of the external power component, so that the space avoidance position 32 corresponds to the second cutter 22, so that the second cutter 22 has space to move. At the same time, the first cutter 12 is pushed under the action of the elastic component 13, and the first cutter 12 pushes the second cutter 22 into the space avoidance position 32, so that the flow channel 23 and the mold cavity are offset. When the external power component pulls the limiting slider 31 to reset, the second cutter 22 is lifted up and reset by the setting of the inclined surface.

[0032] In another embodiment of the limiting structure 3, the adjusting fixing bar 33 specifically includes an adjusting fixing bar 33, one end of the adjusting fixing bar 33 is fixed to the upper mold base, and the other end is inserted into the lower mold base. The adjusting fixing bar 33 is provided with a concave-convex surface 34 on the side close to the limiting slider 31, which has crests and troughs. In the mold closing state, the end of the limiting slider 31 contacts the crest of the concave-convex surface 34, and the flow channel 23 corresponds to the mold cavity. In this embodiment, the external power component is an elastic member 1 (not shown), preferably a spring. When the mold is opened, the adjusting fixing bar 33 moves with the first mold base, so that the end of the limiting slider 31 gradually transitions to the trough position of the concave-convex surface 34, and at the same time, it slides under the action of the elastic member 1, so that the avoidance position 32 corresponds to the second cutter 22, so that the second cutter 22 can enter the avoidance position 32 to complete the water outlet cutting; during the mold closing process, the end of the limiting slider 31 gradually transitions from the trough position of the concave-convex surface 34 to the crest position, and at the same time, the limiting slider 31 slides to lift the second cutter 22.

[0033] Furthermore, a second limiting slider 35 is provided above the first limiting slider 31. The second limiting slider 35 passes through the second cutter 22, and a second avoiding position 36 and a third avoiding position 38 are provided on the second limiting slider 35. In this embodiment, the elastic component 13 is used to control the movement of the first cutter 12. In the initial state, the elastic component 13 contacts the side of the second limiting slider 35. Before the second limiting slider 35 is not moved, even if the first avoiding position 32 corresponds to the second cutter 22, the elastic component 13 cannot push the first cutter 12 to move. The elastic component 13 must correspond to the second avoiding position 36 and the third avoiding position 38 must correspond to the second cutter 22 so that they have room to move before the first cutter 12 can be pushed toward the second cutter 22 and the second cutter 22 can be pushed to move.

[0034] Preferably, an elastic member 2 (not shown) is provided at one end of the limiting slider 2 35, and a concave-convex surface 2 37 is provided on the adjustment fixing strip 33, which abuts against the end of the limiting slider 2 35, and the concave-convex surface 2 37 also has crests and troughs. In the initial state, the limiting slider 1 31 corresponds to the crest of the concave-convex surface 1 34, and the limiting slider 2 35 corresponds to the crest of the concave-convex surface 2 37, and at the same time, the elastic component 13 abuts against the side of the limiting slider 2 35.

[0035] When the mold is opened, the fixed strip 33 is adjusted to move with the first mold base, so that the end of the limiting slider 31 gradually transitions to the trough position of the concave-convex surface 34, and slides under the action of the elastic member 1, so that the avoidance position 1 32 corresponds to the second cutter 22. At the same time, the end of the limiting slider 2 35 gradually transitions to the trough position of the concave-convex surface 2 37, and slides under the action of the elastic member 2, so that the avoidance position 2 36 corresponds to the elastic component 13, and the avoidance position 38 corresponds to the second cutter 22, so that it has room for movement. The elastic component 13 pops out and extends out of the avoidance position 2 36, and at the same time pushes the first cutter 12 to move the same stroke. The first cutter 12 pushes the second cutter 22 to move the same stroke to the position of the avoidance position 1 32, so that the runner 23 is misaligned with the mold cavity position, thereby achieving the cutting off of the water outlet.

[0036] The limiting slider 1 31 and the limiting slider 2 35 play a role of mutual constraint, and the action of the nozzle cutter can only be realized when the two sliders reach the same position.

[0037] One embodiment of the elastic component 13 of the present invention specifically includes a movable block 131, which is fixedly connected to the first cutter 12 and the pressure rod 132 respectively. An elastic member three (not shown) is sleeved on the pressure rod 132, and the elastic member three is respectively in contact with the movable block 131 and the upper mold base. The end of the pressure rod 132 is in contact with the limiting slider 2 35. In the initial state, the end of the pressure rod 132 is in contact with the side of the limiting slider 2 35. When the mold is opened, the limiting slider 2 35 slides so that the avoidance position 2 36 corresponds to the end of the pressure rod 132, so that the pressure rod 132 has a movable space. At this time, the elastic member three pushes the movable block 131 to move, that is, the pressure rod 132 and the first cutter 12 are moved at the same time.

[0038] Preferably, a pressing block 133 is provided at the end of the pressing rod 132, and a slope adapted to the second avoidance position 36 is provided on one side of the pressing block 133 to facilitate movement during resetting.

[0039] It will be apparent 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 characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed within the present invention. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0040] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method 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 can also be appropriately combined to form other implementations that can be understood by those skilled in the art.

Claims

1. An injection mold inlet nozzle structure, comprising a first mold base and a second mold base used in conjunction with each other, characterized in that: A first mold core (11) is installed in the first mold base, a movable first cutter (12) is installed near the water inlet, and an elastic component (13) is installed on the first cutter (12); A second mold core (21) is installed in the second mold base, and a movable second cutter (22) is installed near the water outlet. The second cutter (22) contacts the first cutter (12), and a flow channel (23) communicating with the water outlet is provided on the end surface of the second cutter (22) near the first cutter (12). A limiting structure (3) for controlling the movement of the second cutter (22) is also provided, and the limiting structure (3) can push the second cutter (22) to reset.

2. The in-mold nozzle structure of an injection mold according to claim 1, characterized in that: The limiting structure (3) includes a limiting slider (31), the limiting slider (31) passes through the second cutter (22), and one end of the limiting slider (31) can be connected to an external power component, and a clearance position (32) is provided on the side of the limiting slider (31) close to the first cutter (12), the clearance position (32) can correspond to the position of the second cutter (22), and a slope is provided on one side of the clearance position (32).

3. The in-mold nozzle structure of an injection mold according to claim 2, characterized in that: The limiting structure (3) includes an adjusting fixing strip (33), one end of which is fixed to the upper die base and the other end is inserted into the lower die base. The adjusting fixing strip (33) is provided with a concave-convex surface (34) on one side close to the limiting slider (31), and the concave-convex surface (34) abuts against the end of the limiting slider (31). The external power component is an elastic member (31).

4. The in-mold gate structure of an injection mold according to claim 3, characterized in that: A limiting slider 2 (35) is provided above the limiting slider 1 (31), the limiting slider 2 (35) passes through the second cutter (22), and a second avoidance position (36) and a third avoidance position (38) are provided on the limiting slider 2 (35), the elastic component (13) can penetrate into the second avoidance position (36), the second avoidance position (36) is provided with an inclined surface, the third avoidance position (38) can correspond to the position of the second cutter (22), and a side of the third avoidance position (38) is provided with an inclined surface. One end of the second limiting slider (35) is provided with a second elastic member, and the adjusting fixing strip (33) is provided with a second concave-convex surface (37) that abuts against the end of the second limiting slider (35).

5. The in-mold nozzle structure of an injection mold according to claim 1, characterized in that: The elastic component (13) includes a movable block (131), the movable block (131) is fixedly connected to the first cutter (12) and the pressure rod (132), and the pressure rod (132) is sleeved with an elastic member three, the elastic member three is respectively in contact with the movable block (131) and the upper die seat, and the end of the pressure rod (132) is in contact with the limiting slider two (35).

6. The in-mold gate structure of an injection mold according to claim 5, characterized in that: A pressing block (133) is provided at the end of the pressing rod (132), and a slope adapted to the second avoidance position (36) is provided on one side of the pressing block (133).

7. The in-mold nozzle structure of an injection mold according to claim 1, characterized in that: The second cutter (22) is provided with an ejection channel (24) extending to the flow channel (23), and an ejector pin is passed through the ejection channel.

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