Easily-demoulded injection mould for producing cover plate of washing machine

Abstract

According to the easy-to-demold injection mold for washing machine cover plate production, through a circulating gas path arranged in a lower mold and a gas guide groove formed in an ejector rod, during demolding, when the ejector rod just slides to eject out a formed product, the gas guide groove in the ejector rod communicates with the bottom face of the formed product and the circulating gas path at the same time, and the formed product is easily demolded; the cooling gas enters the circulating gas path from the gas inlet connector and is blown to the bottom surface of the formed product from the gas guide groove, so that the formed product can be further cooled to be demoulded more easily, and the wind power of the cooling gas can assist the ejector rod to separate the formed product from the mold core; therefore, product damage caused by forced ejection and demolding of the ejector rod is avoided, and the yield of products is improved.

Description

Technical Field

[0001] The present application relates to the technical field of injection molds, and in particular to an easy-to-release injection mold for producing a washing machine cover. Background Art

[0002] Injection mold is a key tool for producing plastic products. It is a tool used to inject molten plastic material into the mold cavity and then form the desired shape through cooling and solidification. Injection mold is usually divided into upper mold assembly and lower mold assembly, which can be quickly opened and closed on the injection molding machine. The main components of the injection mold include: mold shell, mold cavity, mold core, runner system, cooling system, ejector, bottom plate, etc. The injection mold is usually installed on the injection molding machine for mold opening and mold closing. After the injection mold is opened, the ejector is usually ejected by force to demold. The length and width of the washing machine cover are usually large. The washing machine cover after injection molding has a certain adhesion to the inner wall of the mold core, and the surface of the washing machine cover after molding has not been completely cooled and is not easy to demold. Forced ejection and demolding can easily cause product damage and reduce the product yield. Utility Model Content

[0003] In view of the shortcomings of the prior art, the purpose of this application is to provide an easy-to-demold injection mold for the production of washing machine cover plates to solve the problems raised in the above-mentioned background technology.

[0004] According to one aspect of the present application, an easy-to-demold injection mold for producing a washing machine cover comprises an upper mold, an upper mold core, a lower mold, a lower mold core and a push rod, the upper mold top surface is fixedly provided with an upper mold plate, the upper mold core is embedded in the middle of the bottom surface of the upper mold, the bottom surface of the upper mold is tightly contacted and assembled with the top surface of the lower mold, the lower mold core is embedded in the middle of the top surface of the lower mold, the middle of the bottom surface of the upper mold core and the middle of the top surface of the lower mold core form a closed molding cavity, the lower mold is internally connected to open a flow path, and the two ends of the flow path are respectively connected to the two side walls of the lower mold, one end of the flow path is an air inlet, and an air inlet interface is installed on the side wall of the lower mold at the position of the air inlet. The other end of the air flow path is an air outlet, and an air outlet interface is installed on the side wall of the lower mold at the position of the air outlet, and an electromagnetic valve is installed on the air outlet interface, a supporting base is installed at the bottom of the lower mold, and a plurality of ejector rods are installed on the supporting base, and the upper end of each of the ejector rods slides from bottom to top in sequence through the lower mold and the lower mold core and is flush with the top surface of the lower mold core, each of the ejector rods slides through the inside of the air flow path, and an air guide groove is opened on the outer peripheral side of each of the ejector rods along its axial direction, and each of the air guide grooves is connected with the air flow path, and when the ejector rod is ejected, the air guide groove is connected with the air flow path and the molding cavity.

[0005] Preferably, the circulation air path includes a main air path and a branch air path, the axial direction of the main air path is consistent with the length direction of the lower mold, the two ends of the main air path are respectively connected to the two side walls of the lower mold, and one end of the main air path is the air inlet, and the other end of the main air path is the air outlet, and a plurality of branch air paths are connected on the path of the main air path, the axial direction of each branch air path is consistent with the width direction of the lower mold, and one end of the branch air path is a closed end, and the other end of the branch air path is connected to a side wall of the lower mold as an open end, and a sealing plug is fixedly installed at the open end of the branch air path, each of the push rods slides through the interior of the branch air path, and each of the air guide grooves is connected to the branch air path.

[0006] Preferably, when the top surface of the push rod is flush with the top surface of the lower mold core, the lower end of the air guide groove is located below the air distribution path, and the distance between the upper end of the air guide groove and the top surface of the push rod is smaller than the inner diameter of the air distribution path.

[0007] Preferably, the inner diameter of the main gas path is larger than the inner diameter of the branch gas path.

[0008] Preferably, the depth of the air guide groove is less than half of the diameter of the push rod.

[0009] Preferably, the support base includes a supporting side plate, a push plate, a spring and a lower mold, support side plates are fixedly provided on both sides of the bottom surface of the lower mold, the lower mold is fixedly provided on the bottom surface of the supporting side plates, a push plate is arranged above the lower mold, the push plate is fixedly connected to the lower end of the push rod, a spring is fixedly provided between the push plate and the lower mold, and both sides of the push plate are in sliding contact with the side walls of the supporting side plates.

[0010] The advantages of the present application over the prior art are as follows: an easy-to-demold injection mold for producing a washing machine cover plate of the present application, through the air flow path arranged inside the lower mold and the air guide groove arranged on the ejector rod, enables, during demolding, when the ejector rod just slides out the molded product, the air guide groove on the ejector rod is connected with the bottom surface of the molded product and the air flow path at the same time, thereby allowing cooling gas to enter the air flow path from the air inlet interface and blow from the air guide groove to the bottom surface of the molded product, thereby further cooling the molded product to make it easier to demold, and the wind force of the cooling gas can also assist the ejector rod to separate the molded product from the mold core, thereby avoiding damage to the product caused by forced ejection of the ejector rod, and improving the product yield. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a main cross-sectional view of an easy-to-demold injection mold for producing a washing machine cover according to an embodiment of the present application.

[0012] Figure 2It is a side sectional view of an easy-to-release injection mold for producing a washing machine cover according to an embodiment of the present application.

[0013] Figure 3 This is a three-dimensional exploded view of an easy-to-release injection mold for producing a washing machine cover according to an embodiment of the present application.

[0014] Figure 4 The present invention is a schematic structural diagram of an ejector pin of an easy-to-release injection mold for producing a washing machine cover according to an embodiment of the present application during ejection.

[0015] Figure 5 It is a structural schematic diagram of a push rod of an easy-to-demold injection mold for producing a washing machine cover according to an embodiment of the present application.

[0016] Figure 6 The present invention is a schematic diagram of the internal structure of the air flow path of an easy-to-release injection mold for producing a washing machine cover according to an embodiment of the present application.

[0017] Attached figures: 1. upper mold; 2. upper mold core; 3. lower mold; 4. lower mold core; 5. ejector pin; 51. air guide groove; 6. molding cavity; 7. air flow path; 71. main air path; 72. branch air path; 73. sealing plug; 8. air inlet; 81. air inlet interface; 9. air outlet; 91. air outlet interface; 92. solenoid valve; 10. support base; 101. support side plate; 102. push plate; 103. spring; 104. lower mold plate. DETAILED DESCRIPTION

[0018] In order to make the content of this application easier to understand, the technical solutions in the embodiments of this application will be described clearly and completely in conjunction with the drawings in the embodiments of this application. It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to the attached drawings. Figure 1 As used herein, the terms "inward" and "outward" refer to directions toward and away from, respectively, the geometric center of the particular component.

[0019] like Figure 1 to Figure 5As shown, an easy-to-release injection mold for producing a washing machine cover comprises an upper mold 1, an upper mold core 2, a lower mold 3, a lower mold core 4 and a push rod 5. An upper mold plate is fixedly arranged on the top surface of the upper mold 1, an upper mold core 2 is embedded in the middle of the bottom surface of the upper mold 1, the bottom surface of the upper mold 1 is closely contacted and assembled with the top surface of the lower mold 3, a lower mold core 4 is embedded in the middle of the top surface of the lower mold 3, a closed molding cavity 6 is formed between the middle of the bottom surface of the upper mold core 2 and the middle of the top surface of the lower mold core 4, an air flow path 7 is opened in the lower mold 3, and the two ends of the air flow path 7 are respectively connected to the two side walls of the lower mold 3, and one end of the air flow path 7 is an air inlet 8 and an air inlet interface 81 is installed on the side wall of the lower mold 3 at the position of the air inlet 8, the other end of the air flow path 7 is an air outlet 9 and an air outlet interface 91 is installed on the side wall of the lower mold 3 at the position of the air outlet 9, and an electromagnetic valve 92 is installed on the air outlet interface 91, the air inlet interface 81 is connected to an air pump through a connecting pipe, and the air pump is connected to a refrigerator, so that the cooling gas can enter the air flow path 7; a support base 10 is installed at the bottom of the lower mold 3, specifically, the support base 10 includes a support side plate 101, a push plate 102, a spring 103 and a lower mold plate 104, the lower mold Both sides of the bottom surface of the mold 3 are fixed with supporting side plates 101, and the bottom surface of the supporting side plates 101 is fixed with a lower mold plate 104. A push plate 102 is arranged above the lower mold plate 104, and a plurality of ejector rods 5 are installed on the push plate 102. The push plate 102 is fixedly connected to the lower end of the ejector rod 5. A spring 103 is fixed between the push plate 102 and the lower mold 3. Both sides of the push plate 102 are in sliding contact with the side walls of the supporting side plates 101. The upper end of each ejector rod 5 slides from bottom to top in sequence through the lower mold 3 and the lower mold core 4 and is flush with the top surface of the lower mold core 4. Each ejector rod 5 slides through the inside of the flow path 7. Each ejector rod 5 The outer peripheral side of the rod 5 is provided with an air guide groove 51 along its axial direction. The groove depth of the air guide groove 51 is less than half of the diameter of the ejector rod 5 to ensure the strength of the structure of the ejector rod 5. When the strength of the ejector rod 5 is sufficient, the distance between the upper end of the air guide groove 51 and the top surface of the ejector rod 5 is designed to be small enough, so that the cooling gas can be blown out from the air guide groove 51 as soon as the ejector rod 5 is ejected, so as to ensure that the cooling gas acts on the molded product quickly. Each air guide groove 51 is connected to the flow path 7. When the ejector rod 5 is ejected, the air guide groove 51 is connected to the flow path 7 and the molding cavity 6 (such as Figure 4 As shown); in this design, by providing an air flow path 7 inside the lower mold 3 and an air guide groove 51 on the ejector pin 5, during demolding, when the ejector pin 5 just slides out the molded product, the air guide groove 51 on the ejector pin 5 is connected with the bottom surface of the molded product and the air flow path 7 at the same time, so that the cooling gas enters the air flow path 7 from the air inlet interface 81 and blows from the air guide groove 51 to the bottom surface of the molded product, thereby further cooling the molded product to make it easier to demold, and the wind force of the cooling gas can also assist the ejector pin 5 to separate the molded product from the mold core, thereby avoiding damage to the product caused by forced ejection of the ejector pin 5, thereby improving the product yield.

[0020] In addition, in a specific implementation, when the injection mold is in the closed state, the solenoid valve 92 at the air outlet interface 91 of the air flow path 7 is in an open state, so that the cooling gas can enter the air flow path 7 from the air inlet interface 81 and flow out from the air outlet interface 91, which can assist the cooling water path of the injection mold itself to cool the injection molded product to a certain extent; when the injection mold is opened, the solenoid valve 92 is switched to a closed state, so that the cooling gas entering the air flow path 7 can flow into and fill the air guide groove 51, so that when the ejector pin 5 is ejected, the cooling gas in the air guide groove 51 can be quickly blown to the bottom surface of the molded product, thereby achieving a cooling blowing effect.

[0021] In one embodiment, in combination Figure 1 , Figure 2 and Figure 6 , the flow gas path 7 includes a main gas path 71 and a branch gas path 72, the axial direction of the main gas path 71 is consistent with the length direction of the lower mold 3, the two ends of the main gas path 71 are respectively connected to the two side walls of the lower mold 3, and one end of the main gas path 71 is an air inlet 8, and the other end of the main gas path 71 is an air outlet 9, and a plurality of branch gas paths 72 are connected on the path of the main gas path 71, and the inner diameter of the main gas path 71 is larger than the inner diameter of the branch gas path 72 to ensure that the cooling gas in the main gas path 71 can better flow into the branch gas path 72, and the axial direction of each branch gas path 72 is consistent with the width direction of the lower mold 3, and one end of the branch gas path 72 is a closed end, and the other end of the branch gas path 72 is connected to the lower mold 3. One side wall of the mold 3 is an open end, and a sealing plug 73 is fixedly installed at the open end of the air branch path 72. Each push rod 5 slides through the inside of the air branch path 72 and each air guide groove 51 is connected to the air branch path 72. In addition, when the top surface of the push rod 5 is flush with the top surface of the lower mold core 4, the lower end position of the air guide groove 51 is located below the air branch path 72, and the distance between the upper end position of the air guide groove 51 and the top surface of the push rod 5 is smaller than the inner diameter of the air branch path 72. This design ensures that the air guide groove 51 is connected to the molding cavity 6 and the air branch path 72 at the same time when the push rod 5 is just pushed out. In addition, the directions of the main air path 71 and the air branch path 72 are arranged in the vertical and horizontal directions to facilitate processing operations.

[0022] In the specific design, gate sleeves are also provided on the upper template, upper mold 1 and upper mold core 2 of the injection mold. The upper template is fixedly installed on the injection molding part of the injection molding machine as a fixed mold, and the injection nozzle of the injection molding machine is aligned with the position of the gate sleeve; an ejection through hole is also provided on the lower template 104. The lower template 104 is fixedly installed on the moving part (hydraulic cylinder or screw) of the injection molding machine as a movable mold, and the ejector rod of the ejection part (hydraulic cylinder) of the injection molding machine passes through the ejection through hole of the lower template 104 and contacts the push plate 102.

[0023] Working principle: During installation, the assembled injection mold is installed on the injection molding machine, and the lower template 104 is fixedly installed on the moving part (hydraulic cylinder or screw) of the injection molding machine as a movable mold, and on the ejector rod of the ejector part (hydraulic cylinder) of the injection molding machine, and the injection nozzle of the injection molding machine is aligned with the gate sleeve position; when the product is opened after injection molding, the moving part of the injection molding machine pulls the lower template 104 of the injection mold to separate the lower mold 3 and the upper mold 1, and then the ejector part of the injection molding machine pushes the push plate 102 to push the ejector rod 5 out. When the ejector rod 5 just slides to eject the molded product, the air guide groove 51 on the ejector rod 5 is connected with the bottom surface of the molded product and the air flow path 7 at the same time, so that the cooling gas enters the air flow path 7 from the air inlet interface 81 and blows from the air guide groove 51 to the bottom surface of the molded product, so that the molded product can be further cooled to make it easier to demold, and the wind force of the cooling gas can also assist the ejector rod 5 to separate the molded product from the mold core.

[0024] The above embodiments are only used to illustrate the technical solutions of the embodiments of the present application, rather than to limit them. Although the embodiments of the present application are described in detail with reference to the above embodiments, it should be understood by those skilled in the art that the technical solutions described in the above embodiments can still be modified, or some of the technical features can be replaced by equivalents, without departing from the spirit and scope defined by the claims of the present application.

Claims

1. An easy-to-release injection mold for producing a washing machine cover, comprising an upper mold (1), an upper mold core (2), a lower mold (3), a lower mold core (4) and a push rod (5), wherein an upper mold plate is fixedly arranged on the top surface of the upper mold (1), an upper mold core (2) is embedded in the middle of the bottom surface of the upper mold (1), the bottom surface of the upper mold (1) and the top surface of the lower mold (3) are tightly contacted and assembled, a lower mold core (4) is embedded in the middle of the top surface of the lower mold (3), and a closed molding cavity (6) is formed between the middle of the bottom surface of the upper mold core (2) and the middle of the top surface of the lower mold core (4), characterized in that: The lower mold (3) is internally connected with an air flow path (7), and the two ends of the air flow path (7) are respectively connected to the two side walls of the lower mold (3), one end of the air flow path (7) is an air inlet (8), and an air inlet interface (81) is installed on the side wall of the lower mold (3) at the position of the air inlet (8), the other end of the air flow path (7) is an air outlet (9), and an air outlet interface (91) is installed on the side wall of the lower mold (3) at the position of the air outlet (9), and an electromagnetic valve (92) is installed on the air outlet interface (91), and a support base is installed at the bottom of the lower mold (3). (10), a plurality of ejector pins (5) are mounted on the support base (10), and the upper end of each ejector pin (5) slides through the lower mold (3) and the lower mold core (4) from bottom to top in sequence and is flush with the top surface of the lower mold core (4), each ejector pin (5) slides through the inside of the air flow path (7), an air guide groove (51) is provided on the outer peripheral side of each ejector pin (5) along its axial direction, and each air guide groove (51) is connected to the air flow path (7), and when the ejector pin (5) is ejected, the air guide groove (51) is connected to the air flow path (7) and the molding cavity (6).

2. The easy-to-release injection mold for producing a washing machine cover according to claim 1, characterized in that: The flow air path (7) comprises a main air path (71) and a branch air path (72); the axial direction of the main air path (71) is consistent with the length direction of the lower mold (3); the two ends of the main air path (71) are respectively connected to the two side walls of the lower mold (3); one end of the main air path (71) is the air inlet (8); the other end of the main air path (71) is the air outlet (9); a plurality of branch air paths (72) are connected on the path of the main air path (71); each branch air path (72) is connected to the main air path (71); The axial direction of each of the air distribution paths (72) is consistent with the width direction of the lower mold (3), and one end of the air distribution path (72) is a closed end, and the other end of the air distribution path (72) is connected to a side wall of the lower mold (3) as an open end. A sealing plug (73) is fixedly installed at the open end of the air distribution path (72), and each of the push rods (5) slides through the interior of the air distribution path (72) and each of the air guide grooves (51) is connected to the air distribution path (72).

3. The easy-to-release injection mold for producing a washing machine cover according to claim 2, characterized in that: When the top surface of the push rod (5) is flush with the top surface of the lower mold core (4), the lower end of the air guide groove (51) is located below the air distribution path (72), and the distance between the upper end of the air guide groove (51) and the top surface of the push rod (5) is smaller than the inner diameter of the air distribution path (72).

4. The easy-to-release injection mold for producing a washing machine cover according to claim 3, characterized in that: The inner diameter of the main gas path (71) is greater than the inner diameter of the branch gas path (72).

5. The easy-to-release injection mold for producing a washing machine cover according to claim 3, characterized in that: The depth of the air guide groove (51) is less than half of the diameter of the push rod (5).

6. The easy-to-release injection mold for producing a washing machine cover according to claim 1, characterized in that: The support base (10) comprises a support side plate (101), a push plate (102), a spring (103) and a lower mold (104); the support side plates (101) are fixedly provided on both sides of the bottom surface of the lower mold (3); the lower mold (104) is fixedly provided on the bottom surface of the support side plates (101); a push plate (102) is provided above the lower mold (104); the push plate (102) is fixedly connected to the lower end of the push rod (5); a spring (103) is fixedly provided between the push plate (102) and the lower mold (3); and both sides of the push plate (102) are in sliding contact with the side walls of the support side plates (101).

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