Double-layer injection mold for PVC wire duct switch box cover

Abstract

The application discloses a PVC wire slot switch box cover double-layer injection mold, which comprises a front mold assembly and a rear mold assembly matched with the front mold assembly, and a guide mechanism is arranged through the front mold assembly and the rear mold assembly; a pouring system in communication with the front mold assembly and the rear mold assembly is arranged on the front mold assembly; and a push-out mechanism is connected to the rear mold assembly; three parting surfaces are arranged between the front mold assembly and the rear mold assembly, a first in-mold cutting mechanism and a second in-mold cutting mechanism are arranged at the first parting surface and the third parting surface respectively, and the first in-mold cutting mechanism and the second in-mold cutting mechanism are used for shearing a main runner and a gate in the pouring system. The mold structure with the three parting surfaces is used to stack the product arrangement into two layers, the in-mold cutting technology that the main runner and the gate can be simultaneously cut off is adopted, the main runner will not be clamped in the mold after being cut off, and the product and the runner can be smoothly separated after the parting surface is opened. The mold can double the product quantity without increasing the length and width of the mold, thereby reducing energy consumption and improving production efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of injection mold, in particular to a PVC wire slot switch box cover double-layer injection mold. BACKGROUND

[0002] Injection molding is a plastic processing technology, which melts plastic particles at a certain temperature, and then injects them into various molds through injection nozzles to become various plastic products used in daily life. The advantages of injection molding are fast production speed, high production efficiency, automatic operation, various colors and shapes, accurate product size, easy product update, ability to shape complex parts, and suitability for large-scale production and complex shape product molding fields. The commonly used PVC wire slot switch box cover injection mold generally adopts a single-layer structure, and one parting surface product out number is four according to product arrangement. For current large-scale product production requirements, the production efficiency is still low, and it also brings large energy consumption. SUMMARY

[0003] The present application provides a PVC wire slot switch box cover double-layer injection mold to solve the problem of low production efficiency of the existing single-layer injection mold.

[0004] To achieve the above application purposes, the technical means adopted are:

[0005] A PVC wire slot switch box cover double-layer injection mold includes a front mold assembly and a rear mold assembly matched therewith, the front mold assembly and the rear mold assembly are provided with a guide mechanism, the front mold assembly is provided with a pouring system connected with the front mold assembly and the rear mold assembly, and the rear mold assembly is connected with a push-out mechanism; three parting surfaces are arranged between the front mold assembly and the rear mold assembly, the first parting surface and the third parting surface are respectively provided with a first in-mold cutting mechanism and a second in-mold cutting mechanism for cutting the main runner and the gate in the pouring system.

[0006] In the above scheme, the mold structure with three parting surfaces stacks the product arrangement into two layers, and the in-mold cutting technology with the main runner and the gate can be cut off at the same time. The main runner will not be stuck in the mold after being disconnected, and the product and the runner can be smoothly detached after the parting surface is opened. The double-layer injection mold can double the product quantity without increasing the length and width of the mold. At the same time, the product can be produced in a relatively small injection molding machine, which reduces energy consumption and improves production efficiency.

[0007] Preferably, the front mold assembly comprises a panel, a front mold core fixing plate, and a front mold plate which are sequentially connected, wherein the front mold core fixing plate is internally provided with a front mold core; the rear mold assembly comprises a push plate and a rear mold plate which are sequentially connected, wherein the push plate is internally provided with a rear mold core; the front mold core fixing plate and the front mold plate are provided with a first parting surface, the front mold plate and the push plate are provided with a second parting surface, and the push plate and the rear mold plate are provided with a third parting surface.

[0008] Preferably, the pushing mechanism comprises a supporting plate, a face needle plate, a bottom needle plate, a bottom plate, a return needle, and a top needle which are arranged below the rear mold plate, one end of the return needle and one end of the top needle are connected to the face needle plate, the other end of the return needle is connected to the push plate, the other end of the top needle is connected to the rear mold plate, the bottom plate is provided with an injection molding machine ejector rod which is arranged to pass through the bottom plate, one end of the injection molding machine ejector rod is connected to the face needle plate, and the other end of the injection molding machine ejector rod is used to be connected to a power output end of an injection molding machine.

[0009] Preferably, the gating system further comprises a sprue bush which is arranged on the panel, the main runner is arranged in the sprue bush, the front mold plate and the rear mold plate are internally provided with a branch runner, one end of the branch runner is in communication with the main runner, and the other end of the branch runner is a sprue which is in communication with the front mold core or the rear mold core.

[0010] Preferably, the first in-mold cutting mechanism has two and is arranged on both sides of the first parting surface, the first in-mold cutting mechanism on one side is provided with a main runner shearing cutter and a sprue cutter, and the first in-mold cutting mechanism on the other side is provided with a sprue cutter; the second in-mold cutting mechanism has two and is arranged on both sides of the third parting surface, the second in-mold cutting mechanism on one side is provided with a main runner shearing cutter and a sprue cutter, and the second in-mold cutting mechanism on the other side is provided with a sprue cutter.

[0011] Preferably, the two first in-mold cutting mechanisms each comprise a first cylinder, a first cylinder fixing plate, a first cutter bar, a first cutter, and a first cutter bar extension slide;

[0012] For each first in-mold cutting mechanism, the first cutter bar extension slide is fixed on one side of the front mold plate, the first cylinder fixing plate is fixed on the outside of the first cutter bar extension slide, the first cylinder is connected to the outside of the first cylinder fixing plate, and the other end of the first cutter is connected to the inside of the first cylinder fixing plate; the first cutter of one first in-mold cutting mechanism comprises a main runner shearing first cutter and a sprue first cutter, and the first cutter of the other first in-mold cutting mechanism comprises a sprue first cutter. In this preferred solution, when the mold is opened, the first cylinder is started to drive the first cutter bar to make a linear motion to cut the main runner or the sprue, and after the cutting is completed, the first cylinder drives the first cutter bar to return to the original position.

[0013] Preferably, the two second in-mold cutting mechanisms each comprise a second cylinder, a second cylinder fixing plate, a second cutter bar, a second cutter and a second cutter bar extension slide;

[0014] For each of the second in-mold cutting mechanisms, the second cutter bar extension slide is fixed on one side of the back mold plate, the second cylinder fixing plate is fixed on the outside of the second cutter bar extension slide, the second cylinder is connected with the outside of the second cylinder fixing plate, and the other end of the second cutter is connected with the inside of the second cylinder fixing plate; the second cutter of one of the second in-mold cutting mechanisms comprises a main runner shearing second cutter and a gate second cutter, and the second cutter of the other of the second in-mold cutting mechanisms comprises a gate second cutter. In the preferred embodiment, the second cylinder is started to drive the second cutter bar to make a linear motion to shear the main runner or the gate when the mold is opened, and the second cylinder drives the second cutter bar to return to the original position after shearing is completed.

[0015] Preferably, the top end of the outside of the first cylinder fixing plate is further provided with a first cutter bar return confirmation switch, and the top end of the outside of the second cylinder fixing plate is further provided with a second cutter bar return confirmation switch. In the preferred embodiment, the first cutter bar return confirmation switch or the second cutter bar return confirmation switch confirms the return when the first cylinder or the second cylinder drives the first cutter bar or the second cutter bar to return to the original position, so that it is ensured that the first cutter bar or the second cutter bar will not be damaged when the mold is closed.

[0016] Compared with the prior art, the technical scheme of the present application has the following beneficial effects:

[0017] The PVC wire slot switch box cover double-layer injection mold of the present application adopts a mold structure with three parting surfaces, arranges the products in two layers, and adopts the in-mold cutting technology that the main runner and the gate can be simultaneously cut off. After being cut off, the main runner will not be stuck in the mold, and the product and the runner can be smoothly separated after the parting surface is opened. The double-layer injection mold can double the product quantity without increasing the length and width of the mold. Meanwhile, the product can be produced by a relatively small injection molding machine, which reduces energy consumption and improves production efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0018] Fig. 1 The figure is a top view and a front view of the mold closing state of the present application.

[0019] Fig. 2 The figure is a top view and a front view of the first parting surface opening of the present application.

[0020] Fig. 3 The figure is a top view and a front view of the second and third parting surfaces opening of the present application. DETAILED DESCRIPTION

[0021] The accompanying drawings are only used for illustrative description and cannot be understood as a limitation of the present application;

[0022] In order to better illustrate the present embodiment, some components in the drawings can be omitted, enlarged or reduced, and do not represent the actual size of the product;

[0023] It is understandable for those skilled in the art that some well-known structures and their descriptions in the drawings can be omitted.

[0024] The technical solutions of the present application will be further described below in combination with the drawings and embodiments.

[0025] Embodiment 1

[0026] A PVC wire slot switch box cover double-layer injection mold, comprising a front mold assembly and a rear mold assembly matched with the front mold assembly, a guide mechanism is provided through the front mold assembly and the rear mold assembly, a pouring system is provided on the front mold assembly and is communicated with the front mold assembly and the rear mold assembly, and a push-out mechanism is connected to the rear mold assembly; three parting surfaces are provided between the front mold assembly and the rear mold assembly, a first in-mold cutting mechanism 10 and a second in-mold cutting mechanism 30 are respectively provided at the first parting surface 1 and the third parting surface 3, and are used to cut the main runner and the gate in the pouring system.

[0027] The working principle of the present embodiment is as follows: the injection mold is closed, the material is injected, filled, pressure maintained and cooled to form a product, and the injection mold is opened after the product is injection molded. First, the first parting surface 1 is opened, leaving enough space for the main runner and the gate to fall off smoothly and for the first cutter 44 to cut smoothly. At this time, the first in-mold cutting mechanism 10 at the first parting surface 1 is started, one side of the first in-mold cutting mechanism 10 shears the gate, and the other side of the first in-mold cutting mechanism 10 shears the main runner and the gate at the same time. The injection mold continues to open, and the second parting surface 2 and the third parting surface 3 are opened in turn. At this time, all the products at the first parting surface 1 will fall off the front mold core 13, and the products will automatically fall off. After the third parting surface 3 is opened, the second in-mold cutting mechanism 30 at the third parting surface 3 is started. One side of the second in-mold cutting mechanism 30 shears the gate, and the other side of the second in-mold cutting mechanism 30 shears the main runner and the gate at the same time. Then, the product is ejected by the ejection function of the injection molding machine through the push-out mechanism provided on the rear mold assembly, and a cycle of product production is completed.

[0028] It should be noted that the guide mechanism, pouring system, push-out mechanism, in-mold cutting mechanism and the like used in the injection mold in the present embodiment are all common components of a double-layer injection mold, and the present embodiment does not improve them. Therefore, their specific structural components are not limited in the present embodiment. The present embodiment is characterized by using a mold structure with three parting surfaces to stack the product positions into two layers, and using an in-mold cutting technology that can simultaneously cut the main runner and the gate, so that the double-layer injection mold can increase the product quantity by several times without increasing the length and width of the mold.

[0029] Example 2

[0030] A double-layer injection mold for a PVC cable tray switch box cover, such as Figs. 1-3 As shown, it includes a front mold assembly and a rear mold assembly that cooperates with it. A guide mechanism is provided through the front mold assembly and the rear mold assembly. The front mold assembly is provided with a gating system that communicates with the front mold assembly and the rear mold assembly. The rear mold assembly is connected with an ejection mechanism. There are three parting surfaces between the front mold assembly and the rear mold assembly. The first parting surface 1 and the third parting surface 3 are respectively provided with a first mold in-cutting mechanism 10 and a second mold in-cutting mechanism 30, which are used to cut the main runner and gate in the gating system.

[0031] The following provides a detailed description of the configuration of each component or mechanism described above in this embodiment.

[0032] The front mold assembly includes a panel 11, a front mold core fixing plate 12, and a front template 14 connected in sequence, wherein a front mold core 13 is installed inside the front mold core fixing plate 12; the rear mold assembly includes a push plate 21 and a rear template 22 connected in sequence, wherein a rear mold core 23 is installed inside the push plate 21; the front mold core fixing plate 12 and the front template 14 form a first parting surface 1, the front template 14 and the push plate 21 form a second parting surface 2, and the push plate 21 and the rear template 22 form a third parting surface 3.

[0033] The ejection mechanism includes a support plate 31, a face pin plate 32, a bottom pin plate 33, a base plate 34, a return pin 35, and an ejector pin 36 disposed below the rear template 22. One end of the return pin 35 and one end of the ejector pin 36 are connected to the face pin plate 32, and the other end of the return pin 35 is connected to the push plate 21. The other end of the ejector pin 36 is connected to the rear template 22. An injection molding machine ejector rod is disposed through the base plate 34. One end of the injection molding machine ejector rod is connected to the face pin plate 32, and the other end of the injection molding machine ejector rod is used to connect to the power output end of the injection molding machine.

[0034] The gating system also includes a gating sleeve 61 set on the panel 11, the main runner is located inside the gating sleeve 61, and the front template 14 and the rear template 22 are provided with branch runners. One end of the branch runner is connected to the main runner, and the other end of the branch runner is a gating point connected to the front model core 13 or the rear model core 23.

[0035] The first in-mold cutting mechanism 10 has two and is arranged on both sides of the first parting surface 1, which specifically includes two sets of: a first cylinder 41, a first cylinder fixing plate 42, a first cutter bar 43, a first cutter 44, a first cutter bar extension slide 45, and a first cutter bar return confirmation switch 46. For each first in-mold cutting mechanism 10, the first cutter bar extension slide 45 is fixed on one side of the front mold plate 14 (in the figure, the two first cutter bar extension slides 45 are respectively located on the left and right sides of the front mold plate 14), the first cylinder fixing plate 42 is fixed on the outside of the first cutter bar extension slide 45, the first cylinder 41 is connected with the outside of the first cylinder fixing plate 42, and the first cutter bar return confirmation switch 46 is arranged at the top end of the outside of the first cylinder fixing plate 42. The other end of the first cutter 44 is connected with the inside of the first cylinder fixing plate 42. The first cutter 44 of one first in-mold cutting mechanism 10 includes a main runner shearing first cutter and a sprue first cutter, and the first cutter 44 of the other first in-mold cutting mechanism 10 includes a sprue first cutter. When the injection mold is opened, the first cylinder 41 is started to drive the first cutter bar 43 to make a linear motion, thereby driving the first cutter 44 to make a shearing action of the main runner or the sprue. After the shearing is completed, the first cylinder 41 drives the first cutter bar 43 to return to the original position. The first cutter bar return confirmation switch 46 confirms the return, so as to ensure that the first cutter bar 43 will not be damaged when the mold is closed. In the embodiment, the first cutter bar extension slide 45, the first cylinder fixing plate 42, and the first cylinder 41 are all fixed by four screws.

[0036] The second in-mold cutting mechanism 30 has two and is arranged on both sides of the third parting surface 3, which specifically includes two sets of: a second cylinder 51, a second cylinder fixing plate 52, a second cutter bar 53, a second cutter 54, a second cutter bar extension slide 55, and a second cutter bar return confirmation switch 56.

[0037] For each of the second in-mold cutting mechanisms 30, the second cutter bar extension slide 55 is fixed on one side of the rear template 22 (in the figure, the two second cutter bar extension slides 55 are located on the left and right sides of the rear template 22, respectively). The second cylinder fixing plate 52 is fixed on the outside of the second cutter bar extension slide 55. The second cylinder 51 is connected to the outside of the second cylinder fixing plate 52. The second cutter bar return confirmation switch 56 is located at the top of the outside of the second cylinder fixing plate 52. The other end of the second cutter 54 is connected to the inside of the second cylinder fixing plate 52. The second cutter 54 of one of the second in-mold cutting mechanisms 30 includes a main runner shearing second cutter and a gate shearing second cutter. The second cutter 54 of the other second in-mold cutting mechanism 30 includes a gate shearing second cutter. When the injection mold opens, the second cylinder 51 is activated to drive the second cutter bar 53 to make linear motion, thereby driving the second cutter 54 to shear the main runner or shear the gate. After shearing is completed, the second cylinder 51 drives the second cutter bar 53 back to its original position. The second cutter bar return confirmation switch 56 confirms the return to its original position, ensuring that the second cutter bar 53 will not be damaged during mold closing. In this embodiment, the second cutter bar extension slide 55, the second cylinder fixing plate 52, and the second cylinder 51 are all fixed with four screws.

[0038] The working principle of this embodiment is as follows: The injection mold closes, the material undergoes injection, filling, pressure holding, and cooling to form the product. After the product injection is completed, the injection mold opens. First, the first parting surface 1 opens, as shown... Fig. 2 As shown, sufficient space is provided to allow the main runner and gate to detach smoothly, and for the first cutter 44 to cut smoothly. At this time, the first in-mold cutting mechanism 10 at the first parting surface 1 is activated. One side of the first in-mold cutting mechanism 10 cuts the gate, while the other side of the first in-mold cutting mechanism 10 cuts both the main runner and the gate simultaneously. Fig. 3 Point 4 indicates the position of the first cutter during the main runner shearing process; point 5 indicates the position of the first cutter during the gate shearing process; point 6 indicates the residual runner after shearing. The injection mold continues to open, with the second parting surface 2 and the third parting surface 3 opening sequentially. Fig. 3 As shown, at this time, all products on the first parting surface 1 will detach from the mold core 13, and the products will automatically detach. After sufficient space is opened on the third parting surface 3, the second mold in-cut structure at the third parting surface 3 is activated. The second mold in-cut mechanism 30 on one side cuts the gate, and the second mold in-cut mechanism 30 on the other side cuts both the main runner and the gate simultaneously. Fig. 3 The position of the second cutter during the main runner shearing is shown at point 4, the position of the second cutter during the gate shearing is shown at point 5, and the residual runner after shearing is shown at point 7. Then, the product is ejected by the ejection mechanism set on the rear mold assembly using the ejection function of the injection molding machine, thus completing one production cycle.

[0039] The terms describing the positional relationship in the drawings are used only for illustrative purposes and should not be construed as limiting the present patent;

[0040] Obviously, the above-mentioned embodiments of the present application are only examples for clearly illustrating the present application, and are not intended to limit the implementation modes of the present application. Based on the above description, other different forms of changes or variations can be made by those skilled in the art. 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 should be included in the protection scope of the claims of the present application.

Claims

1. A PVC wire duct switch box cover double-layer injection mold, comprising a front mold assembly and a rear mold assembly matched therewith, the front mold assembly and the rear mold assembly are provided with a guide mechanism throughout, the front mold assembly is provided with a pouring system in communication with the front mold assembly and the rear mold assembly, and the rear mold assembly is connected with a push-out mechanism; characterized in that, Three parting faces are arranged between the front mold assembly and the rear mold assembly, wherein a first parting face and a third parting face are respectively provided with a first in-mold cutting mechanism and a second in-mold cutting mechanism for shearing a main runner and a gate in the gating system; The front mold assembly comprises a panel, a front mold core fixing plate and a front mold plate which are sequentially connected, wherein the front mold core fixing plate is internally provided with a front mold core; the rear mold assembly comprises a push plate and a rear mold plate which are sequentially connected, wherein the push plate is internally provided with a rear mold core; The front mold core fixing plate and the front mold plate are arranged as a first parting face, the front mold plate and the push plate are arranged as a second parting face, and the push plate and the rear mold plate are arranged as a third parting face; the ejection mechanism comprises a supporting plate, a face needle plate, a bottom needle plate, a bottom plate, a return needle and a top needle which are arranged below the rear mold plate, one end of the return needle and one end of the top needle are connected to the face needle plate, the other end of the return needle is connected to the push plate, and the other end of the top needle is connected to the rear mold plate; the product is ejected by the ejection mechanism arranged on the rear mold assembly through the ejection function of the injection molding machine; An injection molding machine ejector rod is arranged through the bottom plate, one end of the injection molding machine ejector rod is connected to the face needle plate, and the other end of the injection molding machine ejector rod is connected to the power output end of the injection molding machine; the gating system further comprises a gate sleeve arranged on the panel, the main runner is arranged in the gate sleeve, the front mold plate and the rear mold plate are internally provided with a branch runner, one end of the branch runner is communicated with the main runner, and the other end of the branch runner is a gate communicated with the front mold core or the rear mold core; The first in-mold cutting mechanism has two and is arranged on both sides of the first parting face, wherein the first in-mold cutting mechanism on one side is internally provided with a main runner shearing cutter and a gate cutter, and the first in-mold cutting mechanism on the other side is internally provided with a gate cutter; the second in-mold cutting mechanism has two and is arranged on both sides of the third parting face, wherein the second in-mold cutting mechanism on one side is internally provided with a main runner shearing cutter and a gate cutter, and the second in-mold cutting mechanism on the other side is internally provided with a gate cutter.

2. The PVC trunking switch box cover double injection mold according to claim 1, characterized in that, The two first in-mold cutting mechanisms each comprise a first cylinder, a first cylinder fixing plate, a first cutter rod, a first cutter and a first cutter rod extension slide; For each first in-mold cutting mechanism, the first cutter rod extension slide is fixed on one side of the front mold plate, the first cylinder fixing plate is fixed on the outside of the first cutter rod extension slide, the first cylinder is connected to the outside of the first cylinder fixing plate, and the other end of the first cutter is connected to the inside of the first cylinder fixing plate; the first cutter of one first in-mold cutting mechanism comprises a main runner shearing first cutter and a gate first cutter, and the first cutter of the other first in-mold cutting mechanism comprises a gate first cutter.

3. The PVC trunk and switch box cover dual injection mold of claim 2, wherein, The two second in-mold cutting mechanisms each comprise a second cylinder, a second cylinder fixing plate, a second cutter rod, a second cutter and a second cutter rod extension slide; For each of the second in-mold cutting mechanisms, the second cutter bar extension slide is fixed on one side of the rear mold plate, the second cylinder fixed plate is fixed on the outside of the second cutter bar extension slide, the second cylinder is connected with the outside of the second cylinder fixed plate, and the other end of the second cutter is connected with the inside of the second cylinder fixed plate; the second cutter of one of the second in-mold cutting mechanisms comprises a main runner shearing second cutter and a sprue second cutter, and the second cutter of the other of the second in-mold cutting mechanisms comprises a sprue second cutter.

4. The PVC trunk and switch box cover dual injection mold of claim 3, wherein, The top end of the outside of the first cylinder fixed plate is further provided with a first cutter bar return confirmation switch, and the top end of the outside of the second cylinder fixed plate is further provided with a second cutter bar return confirmation switch.

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