Valve oil seal injection mold

Abstract

The utility model discloses a valve oil seal injection mold which comprises an upper mold set, a lower mold set and a lower mold set, the upper mold set comprises an upper mold plate assembly, a material injection nozzle and an upper mold core, a material chamber is arranged on the inner side of the upper mold plate assembly, a discharging hole is formed in the lower side of the upper mold plate assembly, the material injection nozzle is connected with the discharging hole, and the upper side of the upper mold core abuts against the lower side of the material injection nozzle; the heat conductivity coefficient of the injection nozzle is smaller than that of the upper template assembly; the lower die set comprises a lower die plate assembly and a lower die container, and the lower die container and the upper die core are arranged in a matched mode and can form a die cavity during die assembly. According to the valve oil seal injection mold, the material injection nozzle and the upper mold plate assembly are arranged in a split mode, the heat conductivity coefficient of the material injection nozzle is smaller than that of the upper mold plate assembly, and the heat conductivity coefficient of the material injection nozzle is poor, so that the speed of transferring heat at the mold cavity to the material chamber through the material injection nozzle can be reduced, and the temperature of the material chamber can be reduced; the undesirable phenomenon of vulcanization of rubber materials in a material chamber is reduced, and the utilization rate of the materials is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molding, in particular to a valve oil seal injection mold. Background Art

[0002] Most valve seal injection molds are formed by transfer vulcanization, that is, the rubber material is placed in the mold, and then molded by high temperature and high pressure vulcanization. However, due to the high temperature of the mold cavity, the injection nozzle is in contact with the mold cavity, and the heat of the mold cavity can be partially transferred to the material chamber through the injection nozzle, making the temperature of the material chamber higher, causing the rubber material placed in the material chamber to be vulcanized first, resulting in material waste. Utility Model Content

[0003] The main purpose of the utility model is to provide a valve oil seal injection mold, aiming to solve the technical problem in the prior art that the heat of the mold cavity is mostly transferred to the material chamber through the injection nozzle.

[0004] To achieve the above object, the utility model provides a valve oil seal injection mold, comprising:

[0005] An upper mold assembly, comprising an upper mold assembly, an injection nozzle and an upper mold core, wherein a feed hole is provided on the upper side of the upper mold assembly, a material chamber connected to the feed hole is provided on the inner side of the upper mold assembly, a discharge hole connected to the material chamber is provided on the lower side of the upper mold assembly, the injection nozzle is connected to the discharge hole, an injection hole is provided on the inner side of the injection nozzle, the upper mold core is fixedly connected to the upper mold assembly, the upper side of the upper mold core abuts against the lower side of the injection nozzle, and the thermal conductivity of the injection nozzle is smaller than the thermal conductivity of the upper mold assembly;

[0006] The lower mold assembly comprises a lower mold plate assembly and a lower mold liner, wherein the lower mold liner is fixedly connected to the upper side of the lower mold plate assembly, and the lower mold liner is matched with the upper mold core and can form a mold cavity when the mold is closed.

[0007] The injection nozzle and the upper mold assembly in the valve oil seal injection mold are separately arranged, and the thermal conductivity of the injection nozzle is smaller than that of the upper mold assembly. The thermal conductivity of the injection nozzle is poor, so the speed at which the heat in the mold cavity is transferred to the material chamber through the injection nozzle can be slowed down, which is beneficial to lowering the temperature of the material chamber, reducing the undesirable phenomenon of rubber material vulcanization in the material chamber, and improving the utilization rate of the material.

[0008] Preferably, the upper portion of the injection nozzle is inserted into the discharge hole, and a convex ring is provided on the outer periphery of the injection nozzle, and the upper side of the convex ring abuts against the lower side surface of the upper template assembly.

[0009] The upper part of the injection nozzle is inserted into the discharge hole and abuts against the lower side of the upper template assembly through a convex ring. The lower side of the injection nozzle abuts against the upper side of the upper mold core, thereby fixing the injection nozzle and the upper template assembly to each other. The installation of the injection nozzle is relatively simple.

[0010] Preferably, the injection nozzle is made of 316 stainless steel. 316 stainless steel has a small thermal conductivity and poor thermal conductivity, which can effectively block the heat of the mold cavity from being transferred to the material chamber, thereby reducing the undesirable phenomenon of rubber material vulcanization caused by excessive temperature transfer of the rubber material.

[0011] Preferably, the upper mold assembly includes an upper locking mold assembly and a cold flow disk assembly located at the lower side of the upper locking mold assembly, the feed hole is arranged in the upper locking mold assembly, the material chamber is arranged between the upper locking mold assembly and the cold flow disk assembly, the discharge hole is arranged in the cold flow disk assembly, and the thermal conductivity of the injection nozzle is smaller than the thermal conductivity of the cold flow disk assembly.

[0012] The cold flow plate assembly can block the heat of the mold cavity, reduce the temperature of the material chamber, control the temperature of the rubber material in the material chamber to a suitable unvulcanized state, and further reduce the vulcanization of the rubber material in the material chamber.

[0013] Preferably, the cold flow plate assembly includes an upper cold flow plate and a lower cold flow plate located at the lower side of the upper cold flow plate, the discharge hole is arranged on the lower cold flow plate, the upper cold flow plate and the lower cold flow plate are separately arranged, the upper locking mold assembly includes a first upper locking mold plate and a second upper locking mold plate, the second upper locking mold plate is arranged at the middle of the lower side of the first upper locking mold plate, the feed hole passes through the first upper locking mold plate and the second upper locking mold plate, the upper cold flow plate is arranged at the outer periphery of the second upper locking mold plate, and the material chamber is formed between the upper cold flow plate, the second upper locking mold plate and the lower cold flow plate.

[0014] Since the second locking template is arranged in the middle part of the upper cold flow plate, the matching accuracy of the second locking template and the upper cold flow plate is required to be higher, and since the cold flow disk assembly needs to be heat treated, the upper cold flow plate and the lower cold flow plate of the cold flow disk assembly are separately arranged, and the upper cold flow plate can be processed separately, which can improve the processing accuracy of the middle through hole of the upper cold flow plate, thereby improving the matching accuracy of the upper cold flow plate and the second locking template.

[0015] Preferably, a cold flow oil channel is provided on the inner side of the lower cold flow plate, and an oil inlet and an oil outlet connected to the cold flow oil channel are provided on the lower cold flow plate, and the cold flow oil channel is used to pass hot oil to control the temperature of the lower cold flow plate.

[0016] The lower cold flow plate maintains its temperature by passing hot oil into the cold flow oil channel. The temperature control of oil heating is more precise, which can improve the stability of the product. In addition, after the lower cold flow plate uses the structure of the cold flow oil channel, it can be placed in a cleaning tank for ultrasonic cleaning, reducing the difficulty of cleaning the mold.

[0017] Preferably, the upper mold assembly further comprises a heating plate and a heat insulation plate, wherein the heat insulation plate is arranged at the lower side of the upper mold assembly, the heat insulation plate is provided with an avoidance hole, the injection nozzle is arranged in the avoidance hole, the heating plate is arranged at the lower side of the heat insulation plate, the heating plate is provided with a mounting hole, and the upper mold core is fixed in the mounting hole. The heating plate generates high temperature to the mold cavity when heating, and the heat insulation plate can prevent the heat from being transferred to the upper mold assembly.

[0018] Preferably, the lower mold assembly further comprises an ejector plate, which is arranged on the outer periphery of the lower mold liner and can slide up and down relative to the lower mold assembly. When the product is formed in the mold cavity and the upper mold assembly and the lower mold assembly are molded, the ejector plate moves upward to eject the valve oil seal formed on the lower mold liner. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0020] Figure 1 It is a schematic cross-sectional view of the valve oil seal injection mold of the utility model when the mold is closed;

[0021] Figure 2 It is a schematic cross-sectional view of the valve oil seal injection mold of the utility model when the mold is split;

[0022] Figure 3 for Figure 2 A partial enlarged view of point A in the middle.

[0023] In the accompanying drawings: 2-upper template assembly, 21-feed hole, 22-material chamber, 23-discharge hole, 24-upper cold flow plate, 25-lower cold flow plate, 253-cold flow oil channel, 26-first upper locking template, 27-second upper locking template, 3-injection nozzle, 31-injection hole, 32-convex ring, 4-upper mold core, 5-heating plate, 51-mounting hole, 52-heating oil channel, 6-insulation plate, 61-avoidance hole, 71-lower template assembly, 72-lower mold liner, 73-ejection plate.

[0024] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0026] It should be noted that if the embodiments of the present invention involve directional indications, such as up, down, left, right, front, back, etc., then the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0027] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of technical personnel in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0028] like Figures 1 to 3 As shown, a valve oil seal injection mold includes an upper mold assembly and a lower mold assembly.

[0029] The upper mold group includes an upper mold assembly 2, multiple injection nozzles 3 and multiple upper mold cores 4. A feed hole 21 is provided on the upper side of the upper mold assembly 2, a material chamber 22 connected to the feed hole 21 is provided on the inner side of the upper mold assembly 2, and multiple discharge holes 23 connected to the material chamber 22 are provided on the lower side of the upper mold assembly 2. The multiple injection nozzles 3 are connected to the multiple discharge holes 23 one-to-one, and the inner side of the injection nozzles 3 is provided with injection holes 31. The upper mold core 4 is fixedly connected to the upper mold assembly 2, and the multiple injection nozzles 3 and the multiple upper mold cores 4 correspond one-to-one. The upper side of the upper mold core 4 abuts against the lower side of the injection nozzle 3, and the thermal conductivity of the injection nozzle 3 is smaller than the thermal conductivity of the upper mold assembly 2.

[0030] The lower mold assembly includes a lower mold assembly 71 and a lower mold liner 72. The lower mold liner 72 is fixedly connected to the upper side of the lower mold assembly 71. The lower mold liner 72 is matched with the upper mold core 4 and can form a mold cavity when the mold is closed. A mold core hole is provided on the upper side of the upper mold core 4. The diameter of the mold core hole is larger than the diameter of the injection hole 31. The outer diameter of the upper end of the lower mold liner 72 is smaller than the diameter of the injection hole 31. After the mold is closed, a mold cavity is formed between the lower mold liner 72 and the upper mold core 4, and the rubber material can enter the mold cavity.

[0031] The rubber material enters the material chamber 22 from the feed hole 21, and then enters the injection holes 31 of the multiple injection nozzles 3 separately, and then enters the mold cavity formed by the upper mold core 4 and the lower mold 72 to form the valve oil seal. The injection nozzle 3 in the valve oil seal injection mold is separately set from the upper mold assembly 2, and the thermal conductivity of the injection nozzle 3 is smaller than that of the upper mold assembly 2. The thermal conductivity of the injection nozzle 3 is poor, so the speed at which the heat in the mold cavity is transferred to the material chamber 22 through the injection nozzle 3 can be slowed down, which is beneficial to reduce the temperature of the material chamber 22 to maintain the temperature in the non-vulcanized state, reduce the undesirable phenomenon of vulcanization of the rubber material in the material chamber 22, and improve the utilization rate of the material.

[0032] In some specific embodiments, referring to Figure 3 The upper part of the injection nozzle 3 is inserted into the discharge hole 23 , and a convex ring 32 is provided on the outer periphery of the injection nozzle 3 , and the upper side of the convex ring 32 abuts against the lower side of the upper template assembly 2 .

[0033] The upper portion of the injection nozzle 3 is inserted into the discharge hole 23 and abuts against the lower side of the upper mold assembly 2 through the convex ring 32. The lower side of the injection nozzle 3 abuts against the upper side of the upper mold core 4, thereby achieving mutual fixation between the injection nozzle 3 and the upper mold assembly 2. The installation of the injection nozzle 3 is relatively simple.

[0034] In some specific embodiments, the material of the injection nozzle 3 is 316 stainless steel. The thermal conductivity of 316 stainless steel is relatively small, which is 10-30w / (m·℃) at a temperature of 100°. It has poor thermal conductivity and can effectively block the heat of the mold cavity from being transferred to the material chamber 22 compared to the mold steel used in the upper mold assembly 2, thereby reducing the undesirable phenomenon of rubber material vulcanization caused by excessive temperature transfer of the rubber material.

[0035] In some specific embodiments, the upper mold assembly 2 includes an upper locking mold assembly and a cold flow disk assembly located at the lower side of the upper locking mold assembly, the feed hole 21 is arranged in the upper locking mold assembly, the material chamber 22 is arranged between the upper locking mold assembly and the cold flow disk assembly, the discharge hole 23 is arranged in the cold flow disk assembly, and the thermal conductivity of the injection nozzle 3 is smaller than the thermal conductivity of the cold flow disk assembly.

[0036] The cold flow plate assembly can block the heat of the mold cavity, reduce the temperature of the material chamber 22, control the temperature of the rubber material in the material chamber 22 to be in a suitable unvulcanized state, and further reduce the vulcanization of the rubber material in the material chamber 22.

[0037] In some specific embodiments, referring to Figure 1 and Figure 2 The cold flow plate assembly includes an upper cold flow plate 24 and a lower cold flow plate 25 located at the lower side of the upper cold flow plate 24, the discharge hole 23 is arranged on the lower cold flow plate 25, the upper cold flow plate 24 and the lower cold flow plate 25 are separately arranged, the upper locking mold assembly includes a first upper locking template 26 and a second upper locking template 27, the second upper locking template 27 is arranged in the middle of the lower side of the first upper locking template 26, the feed hole 21 passes through the first upper locking template 26 and the second upper locking template 27, the upper cold flow plate 24 is arranged at the outer periphery of the second upper locking template 27, and a material chamber 22 is formed between the upper cold flow plate 24, the second upper locking template 27 and the lower cold flow plate 25.

[0038] Since the second upper locking template 27 is arranged in the middle of the upper cold flow plate 24, the second upper locking template 27 needs to have a high matching accuracy with the upper cold flow plate 24, and since the cold flow plate assembly needs to be heat treated, the upper cold flow plate 24 and the lower cold flow plate 25 of the cold flow plate assembly are separated, and the upper cold flow plate 24 can be processed separately, specifically by wire-cutting, which can improve the processing accuracy of the middle through hole of the upper cold flow plate 24, thereby improving the matching accuracy of the upper cold flow plate 24 and the second upper locking template 27. If the upper cold flow plate 24 and the lower cold flow plate 25 are integrated, they can only be milled by a machining center, so the verticality of the middle through hole is difficult to ensure.

[0039] In some specific embodiments, a cold flow oil channel 253 is provided on the inner side of the lower cold flow plate 25 , and an oil inlet and an oil outlet connected to the cold flow oil channel 253 are provided on the lower cold flow plate 25 . The cold flow oil channel 253 is used to pass hot oil to control the temperature of the lower cold flow plate 25 .

[0040] The oil inlet and the oil outlet are connected to the hot oil supply device. The lower cold flow plate 25 maintains the temperature by passing hot oil into the cold flow oil channel 253. The temperature control using oil heating is more accurate than that using electric heating rods for heating, which can improve the stability of the product. In addition, after the lower cold flow plate 25 uses the structure of the cold flow oil channel 253, it can be placed in a cleaning tank for ultrasonic cleaning, thereby reducing the difficulty of cleaning the mold.

[0041] In some specific embodiments, the upper mold assembly further includes a heating plate 5 and a heat insulation plate 6, the heat insulation plate 6 is arranged at the lower side of the upper mold assembly 2, the heat insulation plate 6 is provided with an avoidance hole 61, the injection nozzle 3 is arranged in the avoidance hole 61, the heating plate 5 is arranged at the lower side of the heat insulation plate 6, the heating plate 5 is provided with a mounting hole 51, and the upper mold core 4 is fixed in the mounting hole 51. The heating plate 5 generates high temperature to the mold cavity, and the heat insulation plate 6 can block the heat from being transferred to the upper mold assembly 2. A heating oil channel 52 can be arranged in the heating plate 5, and hot oil is introduced into the heating oil channel 52 for heating.

[0042] In some specific embodiments, the lower mold assembly further includes an ejector plate 73, which is disposed on the outer periphery of the lower mold liner 72 and can slide up and down relative to the lower mold assembly 71. When the product is molded in the mold cavity and the upper mold assembly and the lower mold assembly are molded, the ejector plate 73 moves upward under the action of an external driving device to eject the valve oil seal formed on the lower mold liner 72.

[0043] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A valve oil seal injection mold, characterized in that: include: An upper mold assembly, comprising an upper mold assembly (2), an injection nozzle (3) and an upper mold core (4); a feed hole (21) is provided on the upper side of the upper mold assembly (2); a material chamber (22) communicating with the feed hole (21) is provided on the inner side of the upper mold assembly (2); a discharge hole (23) communicating with the material chamber (22) is provided on the lower side of the upper mold assembly (2); the injection nozzle (3) is connected to the discharge hole (23); an injection hole (31) is provided on the inner side of the injection nozzle (3); the upper mold core (4) is fixedly connected to the upper mold assembly (2); the upper side of the upper mold core (4) abuts against the lower side of the injection nozzle (3); and the thermal conductivity of the injection nozzle (3) is smaller than the thermal conductivity of the upper mold assembly (2); The lower mold assembly comprises a lower mold plate assembly (71) and a lower mold liner (72), wherein the lower mold liner (72) is fixedly connected to the upper side of the lower mold plate assembly (71), and the lower mold liner (72) is matched with the upper mold core (4) and can form a mold cavity when the mold is closed.

2. The valve oil seal injection mold according to claim 1, characterized in that: The upper part of the injection nozzle (3) is inserted into the discharge hole (23), and a convex ring (32) is provided on the outer periphery of the injection nozzle (3), and the upper side of the convex ring (32) abuts against the lower side of the upper mold assembly (2).

3. The valve oil seal injection mold according to claim 1, characterized in that: The material of the injection nozzle (3) is 316 stainless steel.

4. The valve oil seal injection mold according to claim 1, characterized in that: The upper mold plate assembly (2) comprises an upper locking mold assembly and a cold flow plate assembly located at the lower side of the upper locking mold assembly, the feed hole (21) is arranged in the upper locking mold assembly, the material chamber (22) is arranged between the upper locking mold assembly and the cold flow plate assembly, the discharge hole (23) is arranged in the cold flow plate assembly, and the thermal conductivity of the injection nozzle (3) is smaller than the thermal conductivity of the cold flow plate assembly.

5. The valve oil seal injection mold according to claim 4, characterized in that: The cold flow plate assembly comprises an upper cold flow plate (24) and a lower cold flow plate (25) located at the lower side of the upper cold flow plate (24); the discharge hole (23) is arranged on the lower cold flow plate (25); the upper cold flow plate (24) and the lower cold flow plate (25) are separately arranged; the upper locking mold assembly comprises a first upper locking mold plate (26) and a second upper locking mold plate (27); the second upper locking mold plate (27) is arranged at the middle part of the lower side of the first upper locking mold plate (26); the feed hole (21) passes through the first upper locking mold plate (26) and the second upper locking mold plate (27); the upper cold flow plate (24) is arranged at the outer periphery of the second upper locking mold plate (27); the material chamber (22) is formed between the upper cold flow plate (24), the second upper locking mold plate (27) and the lower cold flow plate (25).

6. The valve oil seal injection mold according to claim 5, characterized in that: A cold flow oil passage (253) is provided on the inner side of the lower cold flow plate (25), and an oil inlet and an oil outlet connected to the cold flow oil passage (253) are provided on the lower cold flow plate (25). The cold flow oil passage (253) is used to pass hot oil to control the temperature of the lower cold flow plate (25).

7. The valve oil seal injection mold according to claim 4, characterized in that: The upper mold assembly also includes a heating plate (5) and a heat insulation plate (6); the heat insulation plate (6) is arranged on the lower side of the upper mold assembly (2); an avoidance hole (61) is provided on the heat insulation plate (6); the injection nozzle (3) is arranged in the avoidance hole (61); the heating plate (5) is arranged on the lower side of the heat insulation plate (6); the heating plate (5) is provided with a mounting hole (51); and the upper mold core (4) is fixed in the mounting hole (51).

8. The valve oil seal injection mold according to claim 1, characterized in that: The lower mold assembly also includes an ejector plate (73), which is arranged on the outer periphery of the lower mold liner (72), and the ejector plate (73) can slide up and down relative to the lower mold assembly (71).

Images