Upper mold hot runner structure of injection mold

Abstract

The utility model discloses an upper mold hot runner structure of an injection mold, which comprises an upper mold seat and a lower mold seat, an upper mold core is arranged at the bottom of the upper mold seat, a lower mold core is arranged at the top of the lower mold seat, the lower mold core and the upper mold core are combined to form a cavity, a sprue gate is arranged on the upper mold seat, a shunting piece is arranged in the upper mold seat, and a plurality of hot nozzles are connected below the shunting piece. A cavity is formed in the upper mold core, a plurality of hot nozzles penetrate into the cavity, a plurality of cooling grooves are formed in the top of the upper mold core, heat absorption outer sleeves are placed in the cooling grooves, the centers of the heat absorption outer sleeves are hollowed out, the bottoms of the corresponding hot nozzles are sleeved with the heat absorption outer sleeves, and water inlets and water outlets are formed in the side walls of the cooling grooves. The cooling water absorbs the heat of the heat absorption outer sleeve, so that the heat of the bottom area of the hot nozzle is reduced, the cooling water absorbing the heat is discharged from the water outlet, and the problems of product deformation or surface defects and the like caused by local overheating of the sprue area of the hot nozzle can be avoided.

Description

TECHNICAL FIELD

[0001] The utility model belongs to injection mold technical field, specifically is a kind of injection mold upper die hot runner structure. BACKGROUND

[0002] Injection mold is a tool for producing plastic products, and is the tool for giving plastic products complete structure and accurate size, specifically refers to the high-pressure injection of heated molten plastic into mold cavity by injection molding machine, after cooling solidification, get shaped product, injection mold is important process equipment for producing various industrial products compared with traditional mold design, computer aided engineering (CAE) technology has great superiority whether in improving productivity, ensuring product quality, or in reducing cost, reducing labor intensity.

[0003] The heat near the hot runner port of the existing injection mold cannot be dissipated in time after product forming, resulting in excessively high temperature in the gate area. This local overheating phenomenon not only increases energy consumption, but also may cause product deformation or surface defects, thereby affecting the quality of the final product. UTILITY MODEL CONTENT

[0004] The utility model aims at providing an injection mold upper die hot runner structure to solve the problems raised in the above background.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0006] An injection mold upper die hot runner structure includes an upper die seat and a lower die seat, the upper die seat bottom is provided with an upper die core, the lower die seat top is provided with a lower die core, the lower die core and the upper die core are combined to form a cavity, the upper die seat is provided with a pouring gate, the upper die seat is provided with a flow divider, the flow divider is connected with a plurality of hot nozzles below, a plurality of hot nozzles penetrate into the cavity, the upper die core top is provided with a plurality of cooling grooves, a plurality of cooling grooves are placed with heat-absorbing sleeves, a plurality of heat-absorbing sleeves are hollow in the center and are sleeved on the bottom of corresponding hot nozzles, the cooling groove side wall is provided with water inlet and water outlet.

[0007] Further, the upper die seat is provided with a cooling water delivery pipe, the cooling groove is communicated with the cooling water delivery pipe through the water inlet and the water outlet, one end of the cooling water delivery pipe is used for cold water input, and the other end is used for heat-absorbed hot water discharge.

[0008] Further, the top of the cooling tank is provided with an annular step, the top of the heat-absorbing sleeve is provided with an extension part matched with the side wall of the annular step, the bottom of the extension part is provided with an annular groove one, the annular groove one is placed with a sealing washer one, one end of the sealing washer one is abutted with the annular groove one, and the other end is abutted with the annular step, the bottom of the heat-absorbing sleeve is provided with an annular groove two, the annular groove two is placed with a sealing washer two, one end of the sealing washer two is abutted with the annular groove two, and the other end is abutted with the bottom of the cooling tank.

[0009] Further, the lower die base further comprises a lower die plate, square irons and a lower fixing plate, the lower die core is installed on the top of the lower die plate, the square irons are provided with two pieces and are symmetrically installed between the lower die plate and the lower fixing plate, the top plate is arranged above the lower fixing plate and between the two square irons, a plurality of ejector pins are fixedly installed on the top plate and extend through the lower die plate to the cavity, the upper end surface of the ejector pin is part of the cavity, and a plurality of through holes are arranged on the lower fixing plate.

[0010] Further, a plurality of guide columns are arranged on the top plate and one end of each of the guide columns is abutted with the bottom of the lower die plate and the other end is abutted with the top of the lower fixing plate.

[0011] Further, a main push rod is further arranged on the top plate, the main push rod penetrates through the lower die plate and is abutted with the bottom of the upper die base, the main push rod is sleeved with a spring, one end of the spring is abutted with the top of the top plate and the other end is abutted with the bottom of the lower die plate.

[0012] Further, one positioning column is arranged at each of the four corners of the bottom of the upper die base, and one positioning hole is arranged at each of the four corners of the top of the lower die base, and the four positioning columns and the four positioning holes are one-to-one corresponding.

[0013] The utility model discloses beneficial effects:

[0014] The utility model discloses a plurality of cooling tanks are arranged on the top of the upper die core, the heat-absorbing sleeve is placed in the cooling tank, the center of the heat-absorbing sleeve is hollow and is sleeved on the bottom of the corresponding hot nozzle, directly absorbs the heat that the hot nozzle emits, the side wall of the cooling tank is provided with a water inlet and a water outlet, by injecting cooling water to the water inlet, the cooling water absorbs the heat of the heat-absorbing sleeve, thereby reducing the heat of the bottom area of the hot nozzle, the cooling water after absorbing heat is discharged from the water outlet, can avoid the product deformation or surface defect caused by the local overheating of the hot nozzle gate area and other problems.

[0015] Compared with the traditional three-plate mold, the two-plate hot runner structure can solve the mold opening swing problem caused by the overweight of the three-plate mold, save the waste of the extra runner material of the three-plate mold, reduce the frequency of the operator taking the water inlet, and reduce the cost of labor, material and broken material.

[0016] Other features and advantages of the present application will be described in detail in the following specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 : The overall structural diagram of the present application.

[0018] Figure 2 : The upper die seat and the lower die seat explosion of the present application Figure One .

[0019] Figure 3 : The upper die seat and the lower die seat explosion of the present application Figure Two .

[0020] Figure 4 : The upper die seat explosion diagram of the present application.

[0021] Figure 5 : The lower die seat explosion diagram of the present application.

[0022] Figure 6 : The sectional view of the present application Figure One .

[0023] Figure 7 : The sectional view of the present application Figure Two .

[0024] Reference signs: 1, upper die seat; 2, lower die seat; 3, upper die core; 4, lower die core; 5, cooling water delivery pipe; 6, product; 11, pouring gate; 12, flow dividing piece; 13, hot nozzle; 14, positioning column; 21, lower die plate; 22, square iron; 23, lower fixed plate; 24, top plate; 25, thimble; 26, guide column; 27, main push rod; 28, spring; 29, positioning hole; 31, cooling groove; 32, heat absorbing sleeve; 33, water inlet; 34, water outlet; 35, annular step; 321, extension; 322, annular groove one; 323, sealing washer one; 324, annular groove two; 325, sealing washer two; 231, through hole. DETAILED DESCRIPTION

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

[0026] Please refer to Figures 1-7 ;

[0027] The utility model provides an injection mold upper die hot runner structure, including upper die seat 1 and lower die seat 2, upper die seat 1 bottom is equipped with upper die core 3, and lower die seat 2 top is equipped with lower die core 4, and upper die core 3 is combined with lower die core 4 and forms the cavity, and upper die seat 1 is equipped with pouring gate 11 on, is used to connect injection molding machine, and the injection material of molten state is injected into the inside mould, and the inside upper die seat 1 is equipped with shunt 12, its function is to melt raw material even distribution to a plurality of hot nozzle 13 from pouring gate 11 injection, and a plurality of hot nozzle 13 are connected with the shunt 12 below, and a plurality of hot nozzle 13 are penetrated to the cavity, ensure that the molten raw material can be injected into the cavity, make raw material cool in the cavity and form, and upper die core 3 top is equipped with a plurality of cooling groove 31, and a plurality of cooling groove 31 are placed with heat absorbing jacket 32, and the center of heat absorbing jacket 32 is hollow, and is sheathed in the bottom of corresponding hot nozzle 13, directly absorbs the heat of hot nozzle 13 emission, and the sidewall of cooling groove 31 is equipped with water inlet 33 and water outlet 34, by injecting cooling water to water inlet 33, cooling water absorbs the heat of heat absorbing jacket 32, thereby reducing the heat of hot nozzle 13 bottom area, and the cooling water after absorbing heat is discharged from water outlet 34, can avoid the occurrence of product 6 deformation or surface defect and other problems due to the local overheating of hot nozzle 13 gate area, the mold of the utility model is through the adoption of two-plate hot runner structure, compared with traditional three-plate mould, can solve the problem of mould opening swing caused by three-plate mould overweight, can also save the waste of flow channel material of three-plate mould, and simultaneously reduces the frequency of water outlet of operator, thereby reducing the cost of labor, material and broken material.

[0028] In the embodiment, the upper die seat 1 is provided with a cooling water delivery pipe 5, the cooling groove 31 is communicated with the cooling water delivery pipe 5 through the water inlet 33 and the water outlet 34, one end of the cooling water delivery pipe 5 is used for input of cold water, and the other end is used for discharge of hot water after heat absorption, so as to ensure that the cooling water can continuously cool the heat absorbing jacket 32.

[0029] Specifically, the cooling water delivery pipe 5 is connected with an external water cooling device, cooling water is injected into one end of the cooling water delivery pipe 5 through the external water cooling device, the cooling water flows into the cooling groove 31 from the water inlet 33, in the cooling groove 31, the cooling water is in full contact with the heat absorbing jacket 32, indirectly absorbs the heat emitted by the hot nozzle 13, thereby effectively reducing the temperature of the hot nozzle 13, after heat exchange, the cooling water becomes hot water and flows out from the water outlet 34, finally flows back to the external water cooling device through the other end of the cooling water delivery pipe 5, the external water cooling device cools the hot water that has absorbed heat, re-cools the hot water into cooling water, and then circulates into the cooling water delivery pipe 5 again.

[0030] In this embodiment, the top of the cooling tank 31 is provided with an annular step 35, the top of the heat absorbing jacket 32 is provided with an extension 321 which is attached to the side wall of the annular step 35, the bottom of the extension 321 is provided with an annular groove 322, a sealing washer 323 is placed in the annular groove 322, one end of the sealing washer 323 abuts against the annular groove 322, and the other end abuts against the annular step 35, thereby sealing the gap between the extension 321 and the annular step 35, preventing the cooling water from leaking from the top, the bottom of the heat absorbing jacket 32 is provided with an annular groove 324, a sealing washer 325 is placed in the annular groove 324, one end of the sealing washer 325 abuts against the annular groove 324, and the other end abuts against the bottom of the cooling tank 31, thereby sealing the gap between the cooling tank 31 and the heat absorbing jacket 32, preventing the cooling water from leaking from the bottom, avoiding production interruption caused by cooling water leakage.

[0031] In this embodiment, the lower die holder 2 further includes a lower die plate 21, square irons 22 and a lower fixing plate 23, the lower die core 4 is installed on the top of the lower die plate 21, the square irons 22 are provided with two pieces which are symmetrically installed between the lower die plate 21 and the lower fixing plate 23, the top plate 24 is arranged above the lower fixing plate 23 and between the two square irons 22, a plurality of ejector pins 25 are fixedly installed on the top plate 24, the plurality of ejector pins 25 extend through the lower die plate 21 to the cavity, the upper end surface of the ejector pin 25 is part of the cavity, so that the ejector pin 25 can closely adhere to the surface of the product 6 during the molding process of the product 6, thereby providing more uniform pushing force during demolding, a plurality of through holes 231 are arranged on the lower fixing plate 23, and the injection molding machine lifts the top plate 24 through the through holes 231, thereby moving the ejector pins 25 together, and finally ejecting the molded product 6.

[0032] In this embodiment, a plurality of guide columns 26 are arranged on the top plate 24, one end of the plurality of guide columns 26 abuts against the bottom of the lower die plate 21, and the other end abuts against the top of the lower fixing plate 23, the guide columns 26 are used to guide the movement of the top plate 24, and ensure the smooth movement thereof.

[0033] In this embodiment, the top plate 24 is further provided with a main push rod 27, the main push rod 27 penetrates through the lower die plate 21 and abuts against the bottom of the upper die holder 1, when the top plate 24 is pushed upward, the main push rod 27 also rises, thereby lifting the upper die holder 1 upward, so that the lower die holder 2 is separated from the upper die holder 1, the main push rod 27 is sleeved with a spring 28, one end of the spring 28 abuts against the top of the top plate 24, and the other end abuts against the bottom of the lower die plate 21, the spring 28 is used to automatically reset the top plate 24 by the rebound action thereof.

[0034] In the embodiment, four positioning columns 14 are arranged at the four corners of the bottom of the upper die holder 1, and four positioning holes 29 are arranged at the four corners of the top of the lower die holder 2, the four positioning columns 14 and the four positioning holes 29 are one-to-one corresponding, when the upper die holder 1 and the lower die holder 2 are combined, the positioning columns 14 are inserted into the corresponding positioning holes 29, thereby realizing the alignment of the two, preventing the problems of incomplete cavity shape or unqualified product 6 size caused by die offset.

[0035] It is obvious for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and the present application can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be regarded as exemplary and non-limiting, the scope of the present application is defined by the appended claims rather than the above description, and all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0036] In addition, it should be understood that although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description manner of the specification is only for the sake of clarity, those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be properly combined to form other embodiments that those skilled in the art can understand.

Claims

1. A hot runner structure for an injection mold upper mold, comprising an upper mold base (1) and a lower mold base (2), wherein the upper mold base (1) has an upper mold core (3) at its bottom, and the lower mold base (2) has a lower mold core (4) at its top, the lower mold core (4) and the upper mold core (3) merging to form a cavity, characterized in that, The upper mold base (1) is provided with a pouring gate (11), and the upper mold base (1) is provided with a flow divider (12). Several hot nozzles (13) are connected below the flow divider (12). Several hot nozzles (13) penetrate into the cavity. Several cooling grooves (31) are provided on the top of the upper mold core (3). Each of the several cooling grooves (31) is provided with a heat-absorbing jacket (32). The center of the several heat-absorbing jackets (32) is hollowed out and is fitted onto the bottom of the corresponding hot nozzles (13). The side wall of the cooling groove (31) is provided with a water inlet (33) and a water outlet (34).

2. The upper mold hot runner structure of an injection mold according to claim 1, characterized in that, The upper mold base (1) is provided with a cooling water conveying pipe (5). The cooling tank (31) is connected to the cooling water conveying pipe (5) through the water inlet (33) and the water outlet (34). One end of the cooling water conveying pipe (5) is used for the input of cold water, and the other end is used for the discharge of hot water after heat absorption.

3. The upper mold hot runner structure of an injection mold according to claim 1, characterized in that, The top of the cooling tank (31) is provided with an annular step (35), and the top of the heat-absorbing jacket (32) is provided with an extension (321) that fits against the side wall of the annular step (35). The bottom of the extension (321) is provided with an annular groove (322), and a sealing gasket (323) is placed in the annular groove (322). One end of the sealing gasket (323) abuts against the annular groove (322), and the other end abuts against the annular step (35). The bottom of the heat-absorbing jacket (32) is provided with an annular groove (324), and a sealing gasket (325) is placed in the annular groove (324). One end of the sealing gasket (325) abuts against the annular groove (324), and the other end abuts against the bottom of the cooling tank (31).

4. The upper mold hot runner structure of an injection mold according to claim 1, characterized in that, The lower mold base (2) also includes a lower template (21), square iron (22) and a lower fixing plate (23). The lower mold core (4) is installed on the top of the lower template (21). There are two square irons (22), which are symmetrically installed between the lower template (21) and the lower fixing plate (23). A top plate (24) is provided above the lower fixing plate (23). The top plate (24) is located between the two square irons (22). Several ejector pins (25) are fixedly installed on the top plate (24). Several ejector pins (25) extend through the lower template (21) to the cavity. The upper end face of the ejector pin (25) is part of the cavity. Several through holes (231) are provided on the lower fixing plate (23).

5. The upper mold hot runner structure of an injection mold according to claim 4, characterized in that, The top plate (24) is provided with a number of guide columns (26), one end of the guide columns (26) abuts against the bottom of the lower template (21), and the other end abuts against the top of the lower fixing plate (23).

6. The upper mold hot runner structure of an injection mold according to claim 5, characterized in that, The top plate (24) is also provided with a main push rod (27), which passes through the lower template (21) and abuts against the bottom of the upper mold base (1). The main push rod (27) is covered with a spring (28), one end of which abuts against the top of the top plate (24) and the other end abuts against the bottom of the lower template (21).

7. The upper mold hot runner structure of an injection mold according to claim 1, characterized in that, The upper mold base (1) has a positioning post (14) at each of the four corners at the bottom, and the lower mold base (2) has a positioning hole (29) at each of the four corners at the top. The four positioning posts (14) correspond one-to-one with the four positioning holes (29).

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