Double-sided injection mold assembly for large products

Abstract

The present invention provides a double-sided injection mold assembly for large-scale products, which comprises a fixed template (1), an intermediate template (2) and an operation template (3) and is used for simultaneously molding two or more products (P), and is characterized by comprising: a fixed runner (10) which is installed inside the fixed template (1) and is provided with a plurality of nozzles (3); a mold cavity for dispensing molten resin into the product (P) to be molded; and an operation runner (20) which is installed inside the intermediate mold plate (2) and distributes the molten resin to an injection point of the cavity of the product (P) to be molded. Therefore, according to the present invention, the flow path through which the molten resin flows is configured to bypass the outside of the cavity of the product to be molded instead of passing through the center of the fixed mold plate, thereby enabling double-sided injection molding even for a large-sized product having a large area, and having an effect of improving productivity.

Description

Technical Field

[0001] The present invention relates to a double-sided injection mold assembly for molding more than two products at the same time, and more specifically, to a double-sided injection mold assembly for large products in which a flow channel for allowing molten resin to flow is constructed to bypass the outside of a cavity to be molded of a product without passing through the center of a fixed mold plate, so that even a wider large product can be double-sided injection molded, thereby improving overall productivity. Background Art

[0002] Stack mold, also known as laminate mold or double-sided injection mold, consists of three sections: fixed mold plate, middle mold plate and operating mold plate.

[0003] This double-sided injection mold has many difficulties in manufacturing, but can achieve twice or more productivity in one injection process.

[0004] Moreover, it does not require equipment investment or additional space, which can significantly reduce product unit price and production time.

[0005] Although such a double-sided injection mold has the advantage of high productivity, it has the problem of being limited to small products due to technical limitations of flow channels through which molten resin flows.

[0006] That is, the runner structure of a conventional double-sided injection mold is as follows Figure 1 As shown, a fixed gate A and an operating gate B for delivering and receiving molten resin are arranged in the center of the mold.

[0007] Therefore, the cavity for molding the product P can only be produced at a position away from the gates A and B, so there is a problem that large products that occupy most of the mold area cannot be molded.

[0008] like Figure 1 As shown, the product P has to avoid gates A and B and be placed at the top and bottom of gates A and B, so the size of the product P is limited by gates A and B.

[0009] Of course, molding is possible if a mold with a size corresponding to a large product is manufactured while avoiding gates A and B.

[0010] However, due to the limited capacity of the injection molding machine on which the mold is installed, the size of the mold is also restricted, so large products cannot be molded on both sides.

[0011] At this time, in the structure of the double-sided injection mold, in each injection molding process, the flow of molten resin must be repeatedly connected and separated in the mold, and leakage of molten resin is likely to occur.

[0012] Therefore, as shown in Reference Document 1, in order to prevent the leakage of the molten resin, a gate valve type flow channel structure has been proposed.

[0013] In this gate valve method, such as Figure 2 As shown, a valve seat S is provided at each end of the fixed gate A and the operating gate B.

[0014] The center of the fixed gate A and the operating gate B is composed of a valve V, which is inserted and fits tightly against the valve seat S through sliding movement to open and close the flow channel.

[0015] However, since the valve V is configured to be in close contact with the inner part or the end of the valve seat S on the same line, there is a problem that the molten resin inevitably leaks into the gap G between the valve seats S.

[0016] Furthermore, when the valve V simultaneously closes the passages of the fixed gate A and the operating gate B, the valve V pushes the molten resin in each moving direction during the sliding movement, so there is a problem that the molten resin inevitably leaks even if the pressure is increased to minimize the gap G. Summary of the invention

[0017] Technical issues to be solved The present invention is proposed in view of the above-mentioned problems, and its purpose is to provide a double-sided injection mold assembly for large products that improves productivity by constructing a flow channel for the flow of molten resin to bypass the outside of the cavity of the product to be molded instead of passing through the center of the fixed mold plate, so that even large products with a large area can be double-sided injection molded.

[0018] In addition, the object of the present invention is to provide a double-sided injection mold assembly for large products that can prevent leakage of molten resin even if the fixed gate and the operating gate are disconnected by constructing a valve that opens and closes the flow path of the fixed gate and the operating gate, thereby reducing the defective rate of the product.

[0019] In addition, an object of the present invention is to provide a double-sided injection mold assembly for large products, in which an operating valve of an operating gate advances to a fixed valve seat of a fixed gate after an operating valve seat to push molten resin to the fixed gate side and close the channel, thereby preventing the molten resin from leaking through the contact surface where the fixed valve seat and the operating valve seat are engaged.

[0020] Technical Solution In order to achieve the above-mentioned purpose, the double-sided injection mold assembly for large products of the present invention is a double-sided injection mold assembly composed of a fixed mold plate 1, an intermediate mold plate 2 and an operating mold plate 3, and is used to simultaneously mold more than two products P. It is characterized in that it includes: a fixed runner 10, which is installed inside the fixed mold plate 1 and is used to distribute the molten resin to the cavity of the product P to be molded; an operating runner 20, which is installed inside the intermediate mold plate 2 and distributes the molten resin to the injection point of the cavity of the product P to be molded.

[0021] At this time, the fixed flow channel 10 receives the molten resin flowing in from the injection molding machine so that a product P having a size corresponding to the cross-sectional area of ​​the operating template 3 relative to the moving direction of the operating template 3 can be molded, and the product P bypasses and is distributed to the outside of the cavity to be molded.

[0022] At this time, the fixed runner 10 according to the present invention includes: a gate 11, which is horizontally arranged on the fixed mold plate 1 and connected to a syringe for molten resin to flow in; a main runner 12, which is vertically connected to the bottom of the gate 11 and branches in two directions toward the edge or outside of the cavity to preliminarily distribute the molten resin; a secondary runner 13, which is vertically connected to both ends of the main runner 12 and branches in two directions toward a position away from the cavity to perform secondary distribution of the molten resin; and The fixed gate 14 is horizontally connected to both ends of the secondary runner 13 , extends to the bottom of the fixed template 1 , and is selectively connected to the operating runner 20 .

[0023] The operating runner 20 according to the present invention includes: an operating gate 21, which is horizontally arranged inside the intermediate mold plate 2 on the same line as the fixed gate 14 and is selectively connected to the fixed gate 14 to supply molten resin; a gathering runner 22, which is vertically connected to the bottom of the operating gate 21 and extends to a predetermined position overlapping with the cavity to collect the molten resin inward; a split runner 23, which is horizontally connected to one end of the gathering runner 22 and branches in two directions toward the fixed mold plate 1 and the operating mold plate 3 to preliminarily distribute the molten resin; and a diffusion runner 24, which is vertically connected to one end of the split runner 23 and branches in multiple directions toward the injection point of the product P to secondarily distribute the molten resin.

[0024] In addition, the double-sided injection mold according to the present invention also includes an opening and closing device 30, which is installed inside the fixed gate 14 and the operating gate 21, and is used to open and close the channels of the fixed gate 14 and the operating gate 21 to prevent leakage of molten resin.

[0025] In addition, the opening and closing device 30 according to the present invention comprises: A fixed valve 31 is slidably inserted into and installed at the center of the fixed gate 14; an operating valve 32 is slidably inserted into and installed at the center of the operating gate 21; a fixed valve seat 33 is inserted into and installed at the end of the fixed gate 14, and engages with the fixed valve 31 to provide a position for opening and closing the channel; an operating valve seat 34 is inserted into and installed at the end of the operating gate 21, and engages with the operating valve 32 to provide a position for opening and closing the channel.

[0026] In addition, the fixed valve 31 according to the present invention includes: a fixed valve shaft 31a, which is arranged at the center of the fixed gate 14, receives external force and slides in the horizontal direction; a fixed valve head 31b, which extends and protrudes a predetermined length at one end of the fixed valve shaft 31a, and is inserted and tightly attached to the fixed valve seat 33 to open and close the channel, and the operating valve 32 includes: an operating valve shaft 32a, which is arranged at the center of the operating gate 21, receives external force and slides in the horizontal direction; an operating valve head 32b, which extends and protrudes a predetermined length at one end of the operating valve shaft 32a, and is inserted and tightly attached to the operating valve seat 34 to open and close the channel.

[0027] In addition, according to the present invention, the fixed valve head 31b includes: a fixed head contraction portion 31b-1, whose diameter is inclined at a gradually decreasing angle from the fixed valve shaft 31a to the fixed valve seat 33; a fixed head plane portion 31b-2, which is flattened with a predetermined diameter along a direction orthogonal to the center at one end of the fixed head contraction portion 31b-1, and the operating valve head 32b includes: an operating head contraction portion 32b-1, whose diameter is inclined at a gradually decreasing angle from the operating valve shaft 32a to the operating valve seat 34; an operating head plane portion 32b-2, which is flattened with a predetermined diameter along a direction orthogonal to the center at one end of the operating head contraction portion 32b-1.

[0028] In addition, the fixed plate 33 according to the present invention includes: a fixed valve seat hole 33a, which passes through the fixed valve head 31b and the operating valve head 32b at a diameter and angle at which the fixed valve head 31b and the operating valve head 32b are adjacent to each other in the center, so as to insert the fixed valve head 31b and the operating valve head 32b, and the operating valve seat 34 includes: an operating valve seat hole 34a, which passes through the operating valve seat hole 34a at a diameter and angle at which the operating valve head 32b contacts the center, so as to insert the operating valve head 32b.

[0029] In addition, the fixed seat hole 33a according to the present invention includes: a fixed valve seat contraction portion 33a-1, which is inserted into and contacts with the fixed head contraction portion 31b-1, and is inclined toward the operating valve seat 34 at an angle with a gradually decreasing diameter from the side facing the fixed valve head 31a; a fixed valve seat expansion portion 33a-2, which is arranged on the extension line of the fixed valve seat contraction portion 33a-1, and is inclined toward the operating valve seat 34 at an angle with a gradually increasing diameter, and the operating head contraction portion 32b-1 is inserted into and contacts therewith; the operating valve seat hole 34a is formed with a diameter inclined at an angle from the side opposite to the operating valve head 32a to the fixed valve seat 33, so that the operating head contraction portion 32b-1 is inserted into and contacts the fixed valve seat 33.

[0030] In addition, according to the present invention, the operating valve seat hole 34a is formed at an inclined angle at the same angle as the fixed valve seat contraction portion 33a-1, and the operating head contraction portion 32b-1 is formed to have a diameter D2 larger than the diameter D1 of the fixed valve seat contraction portion 33a-1, so that the operating head contraction portion 32b-1 moves forward and is in close contact with the fixed valve seat expansion portion 33a-2.

[0031] In addition, according to the present invention, the operating head contraction portion 32b-1 is formed to be inclined at the same angle as the fixed head contraction portion 31b-1, and when the operating head plane portion 32b-2 and the fixed head plane portion 31b-2 protrude into the fixed valve seat contraction portion 33a-1 in a state of close contact with the fixed valve seat expansion portion 33a-2, a length L2 is formed that is longer than the length L1 of the fixed head contraction portion 31b-1, so as to form a gap G between the fixed valve seat contraction portion 33a-1 and the fixed head contraction portion 31b-1.

[0032] Beneficial Effects First, the present invention configures the flow path for the molten resin to bypass the outside of the cavity of the product to be molded instead of passing through the center of the fixed mold plate, so that even large products with a large area can be double-sided injection molded, which has the effect of improving productivity.

[0033] Secondly, the present invention can prevent leakage of molten resin by forming a valve for opening and closing the fixed gate and the operating gate, even if the fixed gate and the operating gate are isolated and disconnected, thereby reducing the defective rate of products.

[0034] Third, the present invention prevents the molten resin from leaking to the contact surface where the fixed valve seat and the operating valve seat meet by advancing the operating valve of the operating gate to the fixed valve seat of the fixed gate, thereby pushing the molten resin to the fixed gate side and closing the channel.

[0035] Fourthly, the present invention forms the head of the operating valve to be longer than the head of the fixed valve. Even if the fixed valve advances to the fixed valve seat to close the flow path of the fixed gate, a tiny gap will be generated between the fixed valve and the fixed valve seat due to interference with the operating valve. In the process of the fixed valve advancing to the fixed valve seat, the molten resin filled in the fixed valve seat will leak through the gap, thereby preventing the molten resin from leaking to the contact surface where the fixed valve and the operating valve are meshed.

[0036] In addition to the above-mentioned effects, the specific effects of the present invention are described below in conjunction with specific matters for implementing the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 2 is a cross-sectional view showing a conventional double-sided injection mold gate valve structure.

[0038] Figure 2 The present invention is a cross-sectional view showing a molten resin leakage process during operation of a conventional double-sided injection mold gate valve.

[0039] Figure 3 3D is a projection stereogram of a double-sided injection mold according to the present invention.

[0040] Figure 4 1 is a front view schematically showing a double-sided injection mold according to the present invention.

[0041] Figure 5 is a perspective view showing a main part of a double-sided injection mold according to the present invention.

[0042] Figure 6 and Figure 7 1 is a structural diagram showing a fixed flow channel and an operating flow channel of a double-sided injection mold according to the present invention.

[0043] Figure 8 It is an enlarged cross-sectional view showing an opening and closing device of a double-sided injection mold according to the present invention.

[0044] Fig. 9 is a cross-sectional view showing in detail the opening and closing device according to the present invention.

[0045] Fig.10 and Fig.11 is a cross-sectional view showing the operation process of the opening and closing device according to the present invention.

[0046] Fig.12 It is a cross-sectional view showing, in an enlarged manner, the main operation of the opening and closing device according to the present invention. DETAILED DESCRIPTION

[0047] In the following, various embodiments of the present invention are described with reference to the accompanying drawings. However, this is not intended to limit the technology described in this document to specific embodiments, and the embodiments of this document should be understood to include various modifications, equivalents and / or alternatives. With respect to the description of the drawings, similar reference numerals may be used for similar components.

[0048] In addition, the terms "first", "second", etc. used in this specification may modify various components without regard to order and / or importance, and are only used to distinguish one component from another component without limiting these components. For example, "first part" and "second part" may represent different parts, regardless of order or importance. For example, without exceeding the scope of the rights of this specification, a first component may be named a second component, and similarly, a second component may also be named a first component.

[0049] In addition, the terms used in this specification are only used to describe specific embodiments and may not be intended to limit the scope of other embodiments. Singular expressions may include plural expressions unless the context clearly indicates a different meaning. The terms used in this specification, including technical or scientific terms, may have the same meaning as commonly understood by ordinary technicians in the technical field described in this specification. The commonly predefined terms in the terms used in this specification may be interpreted as having the same or similar meaning as in the context of the relevant technology, and unless clearly defined in this document, are not interpreted as ideal or overly formal meanings. In some cases, even if the terms are defined in this document, they cannot be interpreted as excluding embodiments of this document.

[0050] like Figures 3 to 5 As shown, the present invention relates to a double-sided injection mold assembly composed of a fixed mold plate 1, an intermediate mold plate 2 and an operating mold plate 3, which is used to simultaneously mold more than two products P. The double-sided injection mold assembly is mainly composed of a fixed flow channel 10 and an operating flow channel 20 for large products.

[0051] First, if Figures 3 to 5 As shown, the fixed flow channel 10 is installed inside the fixed template 1 so as to be surrounded by the heater module.

[0052] That is, the fixed runner 10 is used to receive the molten resin flowing in from the injection molding machine, and bypass and distribute it to the outside of the cavity of the product P to be molded.

[0053] like Figure 6 and Figure 7 As shown, the fixed runner 10 is composed of a gate 11 , a main runner 12 , a secondary runner 13 and a fixed gate 14 .

[0054] The gate 11 is protrudingly provided at the center of the fixed template 1 in a horizontal direction, and is connected to the injection molding machine to receive molten resin.

[0055] The main channel 12 is vertically connected to the lower end of the gate 11 and branches in two directions toward the edge or the outside of the cavity to distribute the molten resin once.

[0056] The secondary runner 13 is connected to both ends of the primary runner 12 at right angles in the vertical direction, and branches in two directions to avoid the cavity, thereby performing secondary distribution of the molten resin.

[0057] The fixed gate 14 is connected to both ends of the secondary runner 13 at right angles in the horizontal direction and extends to the bottom of the fixed template 1 .

[0058] The fixed gate 14 is selectively connected to an operation gate 21 of an operation runner 20 described later according to the opening and closing of the mold plate.

[0059] Then, if Figures 3 to 5As shown, the operating flow channel 20 is installed inside the middle mold plate 2 so as to be surrounded by the heater module.

[0060] That is, the operating runner 20 is selectively connected to the fixed gate 14 according to the opening and closing of the mold plate, and serves to distribute the inflowing molten resin to the injection point of the cavity of the product P to be molded.

[0061] like Figure 6 and Figure 7 As shown, the operating runner 20 is composed of an operating gate 21 , a gathering runner 22 , a dividing runner 23 and a diffusion runner 24 .

[0062] The operating gate 21 is arranged horizontally with the fixed gate 14 inside the intermediate mold plate 2 .

[0063] That is, the operating gate 21 is selectively connected to the fixed gate 14 according to the opening and closing of the mold plate to receive the molten resin.

[0064] The gathering runner 22 is connected to the lower end of the operation gate 21 perpendicularly to the vertical direction, extends to a predetermined position overlapping with the cavity, and gathers the molten resin inwardly.

[0065] The dividing flow channel 23 is connected to one end of the gathering flow channel 22 at a right angle in the horizontal direction, and branches to the left and right directions of the fixed template 1 and the operating template 3 to distribute the molten resin once.

[0066] The diffusion channel 24 is connected to one end of the division channel 23 at a right angle in the vertical direction, and branches in multiple directions toward the injection point of the product P to perform secondary distribution of the molten resin.

[0067] At this time, a plurality of nozzles are connected to the diffusion flow passage 24, and the nozzles are installed to be exposed in the cavity according to the injection points.

[0068] In this way, the fixed flow channel 10 and the operating flow channel 20 for the flow of molten resin do not pass through the center of the fixed mold plate 1 and the intermediate mold plate 2, but are formed by a path around the outside of the cavity of the product P to be molded. Therefore, even large products P such as trays with a large area can be injection molded on both sides without interference.

[0069] At this time, if Figures 4 to 7 As shown, the double-sided injection mold assembly according to the present invention is composed of an opening and closing device 30 installed inside the fixed gate 14 and the operating gate 21.

[0070] That is, the opening and closing device 30 opens and closes the passages of the fixed gate 14 and the operating gate 21 according to the opening and closing of the mold plate to prevent leakage of the molten resin.

[0071] like Figure 8As shown, the opening and closing device 30 is composed of a fixed valve 31 , an operating valve 32 , a fixed valve seat 33 and an operating valve seat 34 .

[0072] The fixed valve 31 is slidably inserted and installed at the center of the fixed gate 14 , and the operating valve 32 is slidably inserted and installed at the center of the operating gate 21 .

[0073] The fixed valve seat 33 is engaged with the fixed valve 31 , provides a position for opening and closing the passage of the fixed gate 14 , and is inserted and installed at the end of the fixed gate 14 .

[0074] The operating valve seat 34 engages with the operating valve 32 , provides a position for opening and closing the passage of the operating gate 21 , and is inserted and installed at the end of the operating gate 21 .

[0075] At this time, if Fig. 9 As shown, the fixed valve 31 has a structure in which a fixed valve shaft 31 a and a fixed valve head 31 b are integrally formed.

[0076] The fixed valve shaft 31a is provided at the center of the fixed gate 14, and slides in the left-right direction in response to external force.

[0077] The fixed valve head 31 b extends out of one end of the fixed valve shaft 31 a by a predetermined length, and is inserted into and closely attached to the fixed valve seat 33 to open and close the passage.

[0078] The operating valve 32 is provided at the center of the operating gate 21, and slides in the left-right direction under the transmission of external force.

[0079] The operating valve 32 has a structure in which an operating valve shaft 32a and an operating valve head 32b are integrally formed.

[0080] The operating valve shaft 32a is provided at the center of the operating gate 21, and slides in the left-right direction by receiving an external force.

[0081] The operating valve head 32b extends and protrudes at one end of the operating valve shaft 32a by a predetermined length, and is inserted into and tightly attached to the operating valve seat 34 to open and close the passage.

[0082] At this time, the fixed valve head 31b is formed to be divided into a fixed head constricted portion 31b-1 and a fixed head flat portion 31b-2.

[0083] The fixed head constriction portion 31 b - 1 is formed at an angle such that the diameter thereof is inclined from the fixed valve shaft 31 a toward the fixed valve seat 33 .

[0084] The fixed head flat surface portion 31 b - 2 is formed flatly with a predetermined diameter at one end of the fixed head constricted portion 31 b - 1 in a direction perpendicular to the center of the fixed valve head 31 b .

[0085] The operating valve head 32b is also formed to be divided into an operating head constriction portion 32b-1 and an operating head flat surface portion 32b-2.

[0086] The operating head constriction portion 32 b - 1 is formed at an angle such that the diameter thereof is inclined from the operating valve shaft 32 a toward the operating valve seat 34 .

[0087] The operating head plane portion 32b-2 is formed at one end of the operating head contraction portion 32b-1 to have a predetermined diameter in a direction at right angles to the center of the operating valve head 32b.

[0088] Furthermore, a fixed valve seat hole 33 a and an operating valve seat hole 34 a are formed at the centers of the fixed valve seat 33 and the operating valve seat 34 , respectively.

[0089] The fixed valve seat hole 33a is used for simultaneously inserting the fixed valve head 31b and the operating valve head 32b, and is formed to have a diameter and an angle such that the fixed valve head 31b and the operating valve head 32b are in close contact with each other.

[0090] That is, the fixed valve seat hole 33 a is formed to be divided into a fixed valve seat contraction portion 33 a - 1 and a fixed valve seat expansion portion 33 a - 2 .

[0091] The fixed valve seat constriction portion 33 a - 1 is a position where the fixed head constriction portion 31 b - 1 is inserted and contacts, and is inclined toward the operating valve seat 34 at an angle with a gradually decreasing diameter from a side facing the fixed valve head 31 a .

[0092] The fixed valve seat expansion portion 33a-2 is a position where the operating head contraction portion 32b-1 is inserted and contacts therewith, and is inclined toward the operating valve seat 34 at an angle with a gradually increasing diameter on the extension line of the fixed valve seat contraction portion 33a-1.

[0093] The fixed valve seat expansion portion 33 a - 2 is formed to be inclined at the same angle as the operating valve seat hole 34 a .

[0094] The operating valve seat hole 34a is formed as a position where the operating head constriction portion 32b-1 is inserted and contacted, and is inclined toward the fixed valve seat 33 at an angle with a gradually decreasing diameter from a side facing the operating valve head 32a.

[0095] The operating valve seat hole 34 a is formed to be inclined at the same angle as the fixed valve seat contraction portion 33 a - 1 , but has a diameter D2 greater than a diameter D1 of the fixed valve seat contraction portion 33 a - 1 .

[0096] That is, when the fixed valve head 31b, the operating valve head 32b, the fixed valve seat contraction portion 33a-1, the fixed valve seat expansion portion 33a-2 and the operating valve seat hole 34a are all formed at the same angle, the operating valve seat hole 34a is formed to have a diameter D2 larger than the fixed valve seat contraction portion 33a-1, as shown in FIG. Fig.10As shown in FIG. 2 b, the operating valve head 32b can advance to the fixed valve seat expansion portion 33a-2 after operating the valve seat hole 34a.

[0097] On the other hand, the operation head constriction portion 32b-1 is formed to be inclined at the same angle as the fixed head constriction portion 31b-1, but is preferably formed to have a length L2 that is longer than the length L1 of the fixed head constriction portion 31b-1.

[0098] That is, Fig.11 As shown in a, when the operating head contraction portion 32b-1 protrudes into the fixed valve seat contraction portion 33a-1 in a state of close contact with the fixed valve seat expansion portion 33a-2, and the operating head plane portion 32b-2 and the fixed head plane portion 31b-2 are in close contact with each other, as shown in FIG. Fig.12 As shown, a gap G is provided between the fixed valve seat contraction portion 33 a - 1 and the fixed head contraction portion 31 b - 1 .

[0099] Next, based on the operation process of the opening and closing device 30 to open and close the channel between the fixed gate 14 and the operating gate 21, the effect of moving the operating valve head 32b to the fixed valve seat expansion part 33a-2 after the operating valve seat hole 34a and generating the gap G is as follows.

[0100] First, when the molding process starts, Figure 3 and Figure 4 As shown, the fixed mold plate 1, the middle mold plate 2 and the operating mold plate 3 are joined to each other, thereby closing the mold cavity.

[0101] That is, when the fixed plate 1, the intermediate plate 2 and the operating plate 3 are closed, Figure 6 and 8 As shown, the fixed valve seat 33 and the operating valve seat 34 are in contact with each other.

[0102] In this case, if Fig.10 As shown in FIG. 1 , the fixed valve 31 and the operating valve 32 are simultaneously away from the fixed valve seat 33 and the operating valve seat 34 , thereby opening the passage between the fixed gate 14 and the operating gate 21 .

[0103] When the passage between the fixed gate 14 and the operating gate 21 is opened, the molten resin flows from the fixed gate 14 to the operating gate 21 , and the molten resin is injected into the cavities of the fixed template 1 , the intermediate template 2 , and the operating template 3 .

[0104] When the molten resin is injected into the cavity and the molding of the product P is completed, as shown in Fig.10 As shown in FIG. 2 b , the operating valve 32 moves to insert into the operating valve seat 34 .

[0105] At this time, the operating valve seat hole 34a is formed to have a diameter D2 larger than the fixed valve seat contraction portion 33a-1, and the operating valve head 32b advances to the fixed valve seat expansion portion 33a-2.

[0106] That is, the operating head contraction portion 32 b - 1 is in close contact with the operating valve seat hole 34 a and the fixed valve seat expansion portion 33 a - 2 , thereby closing the passages of the fixed gate 14 and the operating gate 21 at the same time.

[0107] At this time, while the operating valve 32 is inserted into the operating valve seat 34 and the fixed valve seat 33 and moves, the molten resin filled in the operating valve seat hole 34 a and the fixed valve seat expansion portion 33 a - 2 is pushed out of the fixed gate 14 .

[0108] Therefore, since the contact surface where the fixed valve seat 33 engages with the operating valve seat 34 is blocked by the operating valve 32, leakage of the molten resin can be prevented.

[0109] Furthermore, since the operation head constriction portion 32 b - 1 is formed to have a length L2 longer than the fixed head constriction portion 31 b - 1 , the operation head flat surface portion 32 b - 2 is located inside the fixed valve seat constriction portion 33 a - 1 .

[0110] Then, when the movement of the operating valve 32 is completed, as shown in FIG. Fig.11 As shown in FIG. 1 a , the fixed valve 31 moves to be inserted into the fixed valve seat 33 .

[0111] At this time, since the fixed head plane portion 31b-2 interferes with the operating head plane portion 32b-2 in a state of close contact, as shown in FIG. Fig.12 As shown in FIG. 1 , the valve body is inserted in a state where a predetermined gap G is formed between the fixed head contraction portion 31 b and the fixed valve seat contraction portion 33 a - 1 .

[0112] That is, in the process in which the fixed valve 31 is inserted into the fixed valve seat 33 and moves, the molten resin filled in the fixed valve seat contraction portion 33 a - 1 flows out to the fixed gate 14 through the gap G.

[0113] Therefore, even if the fixed valve 31 moves, the pressure of the molten resin does not increase between the operating valve head 32b and the fixed valve seat 33, thereby preventing leakage.

[0114] Finally, if Fig.11 As shown in FIG. 2 b , when the channels of the fixed gate 14 and the operating gate 21 are closed, the fixed plate 1 , the intermediate plate 2 and the operating plate 3 are opened, and the operating plate 34 moves from the fixed plate 33 .

[0115] At this time, if Fig.12 As shown in b, at the moment when the fixed valve seat 33 is separated from the operating valve seat 34, the operating valve 32 of the fixed valve 31 is pushed away from the fixed valve seat 33 by a predetermined pressure.

[0116] That is, when the operating head contraction portion 32b-1 retreats from the fixed valve seat expansion portion 33a-2, the fixed valve 31 advances an extremely short distance corresponding to the gap G, so that the fixed head contraction portion 31b contacts the fixed valve seat contraction portion 33a-1.

[0117] During this process, the molten resin filled in the gap G is pushed toward the fixed gate 14 , thereby closing the passage of the fixed gate 14 .

[0118] On the other hand, Fig.12 As shown in FIG. 1 , the molten resin is discharged through the gap G, and the remaining molten resin is also blocked between the fixed head flat surface portion 31 b - 2 and the operating head flat surface portion 32 b - 2.

[0119] Although the preferred embodiments of the present invention have been shown and described above, the present invention is not limited to the above-mentioned specific embodiments, and various modifications may be made by a person skilled in the art without departing from the spirit of the present invention as claimed in the claims, and these modified embodiments should not be understood separately from the technical ideas or viewpoints of the present invention.

Claims

1. A double-sided injection mold assembly for large products, comprising a fixed mold plate (1), an intermediate mold plate (2) and an operating mold plate (3), and used for molding two or more products (P) at the same time, characterized in that: include: A fixed flow channel (10) installed inside the fixed mold plate (1) and used to distribute molten resin into the mold cavity of the product (P) to be molded; An operating runner (20) is installed inside the intermediate mold plate (2) and distributes molten resin to the injection point of the cavity of the product (P) to be molded.

2. The double-sided injection mold assembly for large products according to claim 1, characterized in that: The fixed flow channel (10) is configured to receive molten resin flowing in from an injection molding machine so as to be able to mold a product (P) having a size corresponding to a cross-sectional area of ​​the operating template (3) relative to a moving direction of the operating template (3), and the product (P) bypasses and is distributed to the outside of a cavity to be molded.

3. The double-sided injection mold assembly for large products according to claim 2, characterized in that: The fixed flow channel (10) comprises: A gate (11) is arranged on the fixed mold plate (1) along a horizontal direction and is connected to a syringe to allow molten resin to flow in; A main channel (12) connected to the bottom of the gate (11) in a vertical direction and branching toward the edge or outside of the cavity in two directions to preliminarily distribute the molten resin; A secondary flow channel (13) is connected to both ends of the primary flow channel (12) in a vertical direction and branches in two directions to a position away from the cavity, so as to perform secondary distribution of the molten resin; and A fixed gate (14) is horizontally connected to both ends of the secondary runner (13), extends to the bottom of the fixed template (1), and is selectively connected to the operating runner (20).

4. The double-sided injection mold assembly for large products according to claim 3, characterized in that: The operating flow channel (20) comprises: an operating gate (21) disposed inside the intermediate mold plate (2) and horizontally arranged on the same line as the fixed gate (14) and selectively connected to the fixed gate (14) to supply molten resin; a collecting runner (22) connected to the bottom of the operating gate (21) in a vertical direction and extending to a predetermined position overlapping with the cavity to collect the molten resin inwardly; a dividing flow channel (23) connected to one end of the gathering flow channel (22) in a horizontal direction and branching toward the fixed template (1) and the operating template (3) in two directions to preliminarily distribute the molten resin; and A diffusion channel (24) is connected to one end of the division channel (23) in a vertical direction and branches in multiple directions toward an injection point of a product (P) to secondary distribute the molten resin.

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