Injection molding device for sealing end cap machining

Abstract

The utility model relates to an injection molding device for processing a sealing end cap, which comprises an upper mold and a lower mold which can be opened and closed, the upper mold comprises an upper mold plate and an upper backing plate which are connected, a sprue bush is arranged on the upper mold plate, a communicated sprue is arranged in the sprue bush and the upper backing plate, and a first cooling runner positioned on the outer side of the sprue is arranged in the upper backing plate; the lower die comprises a lower base plate, a positioning plate and a lower die plate which are sequentially arranged from top to bottom, the lower base plate is provided with a profiled groove, a high-pressure air channel communicated with the lower portion of the profiled groove is arranged between the positioning plate and the lower base plate, a mold core penetrating through the high-pressure air channel and located in the profiled groove is arranged between the positioning plate and the lower die plate, and a second cooling runner is arranged in the mold core. The problem of bubbling caused by non-uniform or incomplete cooling can be solved by double-sided cooling, the problem of non-uniform air holes caused by foaming time difference on two sides is solved by air inlet and pressure application around the mold core, and the ejection rod ascends to demold, so that the forming precision and the processing efficiency of the sealing end cap are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of foaming injection molding equipment, and in particular relates to an injection molding device for processing a sealing end cap. Background Art

[0002] The foam rubber end cap includes a sealing end cap, which has the advantages of low density and cost, excellent comprehensive mechanical properties, sound insulation and shock absorption, and can be used in the fields of automobiles, pipelines, etc. Its processing technology includes melting the foam material and then forming it through an injection molding device. Compared with chemical foaming agents, physical foaming agents have the advantages of lower cost and no pollution. Therefore, the molding method of its injection molding device is generally to first dissolve the inert gas into the melt of the foaming material under pressure, then release the gas by reducing the pressure, and then form pores in the material to foam. The mixture of the foaming material melt and the gas fills the mold cavity of the injection molding device to form the shape of the end cap, and then solidifies and forms. Although the injection molding device in the prior art uses a cooling water circuit to cool and shape the foaming material in the mold cavity, it is limited to single-sided cooling, which causes the foaming material to continue to foam and produce bubbling under uneven or incomplete cooling, thereby reducing the molding accuracy of the sealing end cap; secondly, the high-pressure gas channel is a one-way structure facing the gate side, which makes the distribution of the injection molding machine pressure and the high-pressure gas pressure uneven, which easily leads to uneven pores on both sides of the sealing end cap due to the difference in foaming time, further affecting the molding accuracy; in addition, there is also the problem of inconvenient demolding, which affects the processing efficiency. Utility Model Content

[0003] The utility model aims to solve at least one of the above technical problems to a certain extent. The utility model provides an injection molding device for processing a sealing end cap, which can improve the molding accuracy and processing efficiency of the sealing end cap.

[0004] The technical solution adopted by the utility model to solve its technical problems is:

[0005] An injection molding device for processing a sealing end cap comprises an upper mold and a lower mold that can be opened and closed, the upper mold comprises a connected upper mold plate and an upper pad, a gate sleeve is provided on the upper mold plate, a gate connected to the gate sleeve and the upper pad is provided, a first cooling channel located outside the gate is provided in the upper pad, the lower mold comprises a lower pad, a positioning plate and a lower mold plate arranged in sequence from top to bottom, the lower pad is provided with a groove, a high-pressure air channel connected to the bottom of the groove is provided between the positioning plate and the lower pad, a core passing through the high-pressure air channel and located in the groove is provided between the positioning plate and the lower mold plate, and a second cooling channel is provided in the core.

[0006] Furthermore, a heating sleeve is provided between the upper mold plate and the sprue sleeve.

[0007] Furthermore, the upper template is provided with an upper guide column, and the positioning plate is provided with a lower guide sleeve. The upper guide column can pass through the upper pad and the lower pad in sequence and cooperate with the lower guide sleeve. A spring is provided outside the upper guide column, and both ends of the spring are respectively limited and cooperated with the upper template and the lower pad.

[0008] Furthermore, the upper mold plate is provided with a limit plate, and a positioning pin is provided between the limit plate and the upper pad, and the limit plate can be slidably matched with the lower mold.

[0009] Furthermore, a lower guide column is provided between the positioning plate and the lower template, and an upper guide sleeve is provided on the upper pad. The lower guide column can pass through the lower pad and cooperate with the upper guide sleeve.

[0010] Furthermore, the first cooling channel includes an annular cavity.

[0011] Furthermore, the second cooling channel comprises a spiral channel close to the inner wall of the groove, and the inlet and outlet of the second cooling channel are located on the positioning plate.

[0012] Furthermore, the lower mold includes a mold base, which is connected to the lower mold plate. A push plate that can be lifted and moved is provided in the mold base, and a push rod is provided on the push plate. The push rod passes through the lower mold plate, the positioning plate and the lower pad in sequence and is arranged corresponding to the groove.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] (1) The utility model cools the outer side of the sealing end cap close to the gate through the first cooling channel and cools the inner side of the sealing end cap through the second cooling channel, thereby forming double-sided cooling to solve the bubbling problem caused by uneven or incomplete cooling and improve the molding accuracy of the sealing end cap.

[0015] (2) The utility model forms an annular high-pressure gas flow channel around the core by passing the high-pressure gas channel through the core, so that the melt can flow evenly to the cavity under the pressure difference between the injection pressure of the melt and the pressure of the high-pressure inert gas, and then foam evenly. The pressure is more uniform than that of the side air intake, which solves the problem of uneven pores on both sides due to the difference in foaming time, which further affects the molding accuracy.

[0016] (3) After the upper die and the lower die are opened and the upper backing plate is separated from the sealing end cap, the push plate can be raised to drive the ejector pin to rise, thereby ejecting the formed sealing end cap from the groove to achieve demolding, which is beneficial to improving processing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0018] Figure 1It is a schematic diagram of mold opening of one embodiment of the utility model;

[0019] Figure 2 It is a schematic diagram of injection molding of an embodiment of the utility model;

[0020] Figure 3 It is a demoulding schematic diagram of an embodiment of the utility model.

[0021] Markings in the figure: upper mold 1, upper mold plate 101, upper pad 102, gate sleeve 103, gate 104, first cooling channel 105, annular cavity 1051, heating sleeve 106, upper guide pin 107, spring 108, limit plate 109, positioning pin 110, upper guide sleeve 111;

[0022] Lower mold 2, lower pad 201, positioning plate 202, lower mold plate 203, groove 204, high-pressure air channel 205, second cooling channel 206, spiral channel 2061, inlet 2062 of second cooling channel, outlet 2063 of second cooling channel, lower guide sleeve 207, lower guide column 208, core 209, mold base 210, push plate 211, ejector pin 212, screw 213, sealing end cap finished product 3. DETAILED DESCRIPTION

[0023] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0024] In the description of the present utility model, it should be understood that the terms "upper", "lower", "inside", "outside", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, "multiple" and "several" mean two or more, unless otherwise clearly and specifically defined.

[0025] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] In view of the problem in the prior art that the foaming material bubbling due to single-sided cooling reduces the molding accuracy of the sealing end cap, it is considered to set double-sided cooling in the injection molding device to improve cooling uniformity and reliability, such as Figure 1 As shown, it is a preferred embodiment of the injection molding device for processing a sealing end cap described in the utility model, the injection molding device includes an upper mold 1 and a lower mold 2 that can be opened and closed, the upper mold 1 includes a connected upper mold plate 101 and an upper pad 102, a sprue sleeve 103 is provided on the upper mold plate 101, and a gate 104 connected to the sprue sleeve 103 and the upper pad 102 is provided, and a first cooling channel 105 located outside the gate 104 is provided in the upper pad 102, and the lower mold plate 2 includes a lower pad 201, a positioning plate 202 and a lower mold plate 203 arranged in sequence from top to bottom, and the lower pad 201 is provided with a A groove 204 is provided, and a high-pressure air channel 205 connected to the bottom of the groove 204 is provided between the positioning plate 202 and the lower pad 201. A core 209 passing through the high-pressure air channel 205 and located in the groove 204 is provided between the positioning plate 202 and the lower mold plate 203. A second cooling channel 206 is provided in the core 209, and then the outer side of the sealing end cap close to the gate 104 is cooled by the first cooling channel, and the inner side of the sealing end cap is cooled by the second cooling channel, forming double-sided cooling, so as to solve the bubbling problem caused by uneven or incomplete cooling and improve the molding accuracy of the sealing end cap.

[0027] Furthermore, a heating sleeve 106 is provided between the upper template 101 and the gate sleeve 103. An installation groove for installing the heating sleeve 106 can be set in the upper template 101 to facilitate the installation of the heating sleeve 106. The heating sleeve 106 can adopt a resistance heating structure to heat the gate 104 and prevent the gate 104 from being blocked, thereby ensuring the stability of injection molding.

[0028] Furthermore, the upper template 101 is provided with an upper guide column 107, and the positioning plate 202 is provided with a lower guide sleeve 207. The upper guide column 107 can pass through the upper pad 102 and the lower pad 201 in sequence and cooperate with the lower guide sleeve 207. The upper guide column 107 is provided with a spring 108 on the outside, and the two ends of the spring 108 are respectively limited and cooperated with the upper template 101 and the lower pad 201. The cooperation between the upper guide column 107 and the lower guide sleeve 207 can increase the reliability and accuracy of the upper mold 1 and the lower mold 2 when the mold is closed, which is beneficial to improving the molding accuracy of the sealing end cap.

[0029] Furthermore, the upper mold plate 101 is provided with a limit plate 109, and a positioning pin 110 is provided between the limit plate 109 and the upper pad 102. The limit plate 109 can slide with the lower mold 2, and the positioning pin 110 can be used to realize a detachable connection between the upper mold plate 101 and the upper pad 102, so as to facilitate the disassembly and assembly of the heating sleeve 106. At the same time, when the upper mold 1 is raised and lowered, the limit plate 109 can slide with the lower mold 2 in the vertical direction to limit the left and right movement of the upper mold 1, thereby further improving the precision of the upper mold 1 and the lower mold 2 when the mold is closed, which is beneficial to improving the molding precision of the sealing end cap.

[0030] Furthermore, a lower guide column 208 is provided between the positioning plate 202 and the lower mold plate 203, and the upper guide sleeve 111 is provided on the upper pad 102. The lower guide column 208 can pass through the lower pad 201 and cooperate with the upper guide sleeve 111. The lower guide column 208 and the upper guide sleeve 111 can be used for positioning by sliding cooperation, thereby further increasing the reliability and accuracy of the upper mold 1 and the lower mold 2 when they are closed, which is beneficial to improving the molding accuracy of the sealing end cap.

[0031] Furthermore, the first cooling channel 105 includes an annular cavity 1051, which is an annular structure arranged around the gate 104 and has a large cooling area. The inlet and outlet of the annular cavity 1051 can be led out of the upper mold 1 from the upper pad 102 so that cooling water can be introduced into the annular cavity 1051 for cooling, thereby further improving the cooling uniformity.

[0032] Furthermore, the second cooling channel 206 includes a spiral channel 2061 close to the inner wall of the groove 204. The inlet 2062 and the outlet of the second cooling channel are located on the positioning plate 202. Cooling water can be introduced from the positioning plate 202 to the spiral channel 2061. After the cooling water cools the inner wall of the sealing end cap along the spiral channel 2061, it can be discharged from the positioning plate 202 to the lower mold 2, which has a larger cooling area. At the same time, it avoids the inlet and outlet being drawn out from the lower mold plate 203 and passing through the groove 204 to affect the shape of the sealing end cap. Similarly, the inlet and outlet of the high-pressure air channel 205 can be drawn out from between the positioning plate 202 and the lower pad 201.

[0033] Furthermore, the lower mold 2 includes a mold base 210, which is connected to the lower mold plate 203. A push plate 211 that can be lifted and moved is provided in the mold base 210. A push rod 212 is provided on the push plate 211. The push rod 212 passes through the lower mold plate 203, the positioning plate 202 and the lower pad 201 in sequence and is arranged corresponding to the groove 204. The mold base 210 and the lower mold plate 203 can be detachably connected by screws 213, which is convenient for installing the push plate 211 from above the mold base 210. The mold base 210 can be provided with a limiting portion that cooperates with the push plate 211 to limit the travel of the push plate 211, and then the push plate 211 is used to rise and drive the push rod 212 to push the molded sealing end cap for demolding.

[0034] The working principle of the above-mentioned injection molding device includes:

[0035] The upper mold plate 101 and the push plate 211 can be connected to a hydraulic cylinder, a pneumatic cylinder or the like to drive the upper mold 1 or the push plate 211 to move upward and downward. Figure 1 As shown, when the upper mold 1 rises and the upper mold 1 and the lower mold 2 are opened, the upper mold plate 101 and the upper pad 102 rise synchronously, the upper guide column 107 slides up relative to the lower guide sleeve 207, the spring 108 extends, the upper guide sleeve 111 separates from the lower guide column 208, and the push plate 211 drives the ejector rod 212 to descend so that the ejector rod 212 is flush with the bottom of the groove 204, so that the groove 204 and the core 209 can be cleaned and maintained before injection molding.

[0036] During injection molding, Figure 2 As shown, the upper mold 1 descends, the upper guide column 107 slides down relative to the lower guide sleeve 207, the spring 108 is compressed, and the upper guide sleeve 111 cooperates with the lower guide sleeve 207, so that when the upper mold 1 and the lower mold 2 are closed, the upper pad 102 covers the groove 204 of the lower pad 201, so that a cavity connected to the gate 104 is formed between the groove 204 and the lower surface of the upper pad 102, and the foaming material melt is injected into the gate sleeve 103, and the melt flows into the cavity along the gate 104, and a high-pressure inert gas is introduced into the high-pressure gas channel 205. Because the core 209 Passing through the high-pressure gas channel, thus forming an annular high-pressure gas flow channel around the core 209, the melt flows evenly to the cavity under the pressure difference between the injection pressure of the melt and the pressure of the high-pressure inert gas, and the inert gas dissolves into the melt under pressure, and then the gas is released by reducing the pressure, thereby forming pores in the melt and foaming, filling the entire cavity. Compared with the side air intake and pressure, the air intake around the core 209 makes the pressure on both sides of the sealing end cap more uniform, thereby solving the problem of uneven pores on both sides of the gas due to the difference in foaming time, which further affects the molding accuracy.

[0037] Then, cooling water is passed through the first cooling channel to cool the outer side of the sealing end cap near the gate 104, and cooling water is passed through the second cooling channel to cool the inner side of the sealing end cap. Double-sided cooling avoids bubbling problems.

[0038] After cooling and forming, Figure 3 As shown, the upper mold 1 and the lower mold 2 are opened, the upper pad 102 is separated from the sealing end cap, and the push plate 211 is raised to drive the ejector rod 212 to rise, and the formed sealing end cap product 3 is ejected from the groove 204 to achieve demolding. The overall structure is simple, easy to disassemble and demold, and is beneficial to improving processing efficiency. The upper pad 102 and the core 209 of different grooves 204 can be replaced to meet the processing requirements of sealing end caps of different shapes.

[0039] The series of detailed descriptions listed above are only specific descriptions of feasible embodiments of the present invention. They are not intended to limit the protection scope of the present invention. All equivalent embodiments or changes that do not deviate from the technical spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. An injection molding device for processing a sealing end cap, comprising an upper mold (1) and a lower mold (2) that can be opened and closed, characterized in that: The upper mold (1) comprises an upper mold plate (101) and an upper pad (102) connected to each other, a sprue sleeve (103) is provided on the upper mold plate (101), a sprue (104) connected to the sprue sleeve (103) and the upper pad (102) is provided inside, and a first cooling channel (105) located outside the sprue (104) is provided inside the upper pad (102), and the lower mold (2) comprises a lower pad (201), a positioning plate (202) and a lower plate (203) arranged in sequence from top to bottom. ) and a lower template (203), the lower pad (201) is provided with a groove (204), a high-pressure air channel (205) communicating with the bottom of the groove (204) is provided between the positioning plate (202) and the lower pad (201), a core (209) passing through the high-pressure air channel (205) and located in the groove (204) is provided between the positioning plate (202) and the lower template (203), and a second cooling channel (206) is provided in the core (209).

2. The injection molding device for processing the sealing end cap according to claim 1, characterized in that: A heating sleeve (106) is provided between the upper mold plate (101) and the sprue sleeve (103).

3. The injection molding device for processing a sealing end cap according to claim 1, characterized in that: The upper template (101) is provided with an upper guide column (107), and the positioning plate (202) is provided with a lower guide sleeve (207). The upper guide column (107) can pass through the upper pad (102) and the lower pad (201) in sequence and cooperate with the lower guide sleeve (207). The upper guide column (107) is provided with a spring (108) outside, and the two ends of the spring (108) are respectively limited and cooperate with the upper template (101) and the lower pad (201).

4. The injection molding device for processing the sealing end cap according to claim 3, characterized in that: The upper mold plate (101) is provided with a limit plate (109), a positioning pin (110) is provided between the limit plate (109) and the upper pad (102), and the limit plate (109) can be slidably matched with the lower mold (2).

5. The injection molding device for processing the sealing end cap according to claim 3, characterized in that: A lower guide column (208) is provided between the positioning plate (202) and the lower template (203), and an upper guide sleeve (111) is provided on the upper pad (102). The lower guide column (208) can pass through the lower pad (201) and cooperate with the upper guide sleeve (111).

6. The injection molding device for processing a sealing end cap according to claim 1, characterized in that: The first cooling channel (105) comprises an annular cavity (1051).

7. The injection molding device for processing a sealing end cap according to claim 1, characterized in that: The second cooling channel (206) comprises a spiral channel (2061) close to the inner wall of the groove (204); an inlet (2062) and an outlet of the second cooling channel are located on the positioning plate (202).

8. The injection molding device for processing a sealing end cap according to any one of claims 1 to 7, characterized in that: The lower mold (2) comprises a mold base (210), the mold base (210) is connected to the lower mold plate (203), a push plate (211) capable of being raised and lowered is provided in the mold base (210), a push plate (211) is provided on the push plate (211), and the push rod (212) passes through the lower mold plate (203), the positioning plate (202) and the lower pad (201) in sequence and is arranged corresponding to the mold groove (204).

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