Plastic mold ejection mechanism

Abstract

The utility model discloses a plastic mould ejection mechanism which comprises a mould base, a lower mould, an upper mould, an ejection plate, a sprue and a base plate, the lower mould is fixedly installed on the outer surface of the upper end of the mould base, the upper mould is located on the upper portion of the lower mould, the upper mould is fixedly installed on the outer surface of the lower end of the ejection plate, and the sprue is arranged in the middle of the outer surface of the upper end of the ejection plate. The base plate is fixedly installed in the middle of the outer surface of the upper end of the die holder, secondary ejection structures are arranged at the four corners of the outer surface of the upper end of the base plate, a die cavity is formed in the outer surface of the upper end of the lower die, and first ejector pin holes are formed in the four corners of the bottom of the die cavity. According to the ejection mechanism of the plastic mold, the secondary ejection structure is arranged, so that the workpiece can be conveniently discharged, the workpiece is prevented from being adhered to the ejector pin, and the secondary ejection structure is arranged, so that a relatively large force can be applied to the workpiece during discharging, and the phenomenon that the workpiece is adhered to the mold cavity and is difficult to demold is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of plastic mold demoulding, in particular to an ejection mechanism for a plastic mold. Background Technique

[0002] In the prior art, when producing plastic products, the workpiece needs to be ejected and blanked by a ejector pin.

[0003] When blanking the product by the ejector pin, the product is easily adhered to the ejector pin, and the ejection of the workpiece depends on the reset force of the spring. When the workpiece adheres to the mold cavity, it is difficult to blank the workpiece only relying on the spring. For this reason, we propose an ejection mechanism for a plastic mold. Content of the Utility Model

[0004] (I) Technical Problems to be Solved

[0005] In view of the deficiencies of the prior art, the utility model provides an ejection mechanism for a plastic mold, which has a secondary ejection structure and is convenient for blanking the workpiece, etc., and can effectively solve the problems in the background technique.

[0006] (II) Technical Solutions

[0007] To achieve the above object, the technical solution adopted by the utility model is: an ejection mechanism for a plastic mold, including a mold base, a lower mold, an upper mold, a top plate, a nozzle and a backing plate, and the lower mold is fixedly installed on the upper outer surface of the mold base, the upper mold is located above the lower mold, the upper mold is fixedly installed on the lower outer surface of the top plate, the nozzle is arranged in the middle of the upper outer surface of the top plate, the backing plate is fixedly installed in the middle of the upper outer surface of the mold base, and secondary ejection structures are arranged at the four corners of the upper outer surface of the backing plate. A mold cavity is opened on the upper outer surface of the lower mold, and first ejector pin holes are opened at the four corners of the bottom of the mold cavity. The secondary ejection structure includes a cylindrical seat, a cavity, a concave hole, a sealing gasket, a movable plate, a first sealing ring, a limit pin, a second ejector pin hole, a first hydraulic oil inlet and outlet valve, a second hydraulic oil inlet and outlet valve, a limit block, a second sealing ring, a compression spring, a fixed block, a sliding hole, a first ejector pin, a through groove, a blanking block and a second ejector pin. The lower outer surface of the cylindrical seat is fixedly connected to the upper outer surface of the backing plate. The upper end of the first ejector pin extends into the first ejector pin hole, and the outer wall of the first ejector pin is in sliding connection with the first ejector pin hole. The cavity is opened inside the cylindrical seat. The second hydraulic oil inlet and outlet valve is fixedly installed on the upper part of the outer surface of one side of the cylindrical seat. The first hydraulic oil inlet and outlet valve is fixedly installed on the lower part of the outer surface of one side of the cylindrical seat. The second ejector pin hole is opened in the middle of the upper outer surface of the cylindrical seat, and the second ejector pin hole communicates with the cavity. The movable plate and the limit pin are both located in the cavity, and the first sealing ring is fixedly installed on the outer wall of the movable plate.

[0008] Preferably, the number of the limiting pins in a set of the secondary ejection structures is four groups. The four groups of limiting pins are fixedly installed at the four corners of the outer surface of the upper end of the movable plate. The concave hole is opened in the middle of the outer surface of the upper end of the movable plate. The sealing gasket is fixedly installed in the middle of the concave hole.

[0009] Preferably, the first ejector pin is fixedly installed in the middle of the outer surface of the upper end of the movable plate. The through groove is opened in the middle of the outer surface of the upper end of the first ejector pin. And the concave hole is communicated with the through groove. The outer wall of the first ejector pin is in sliding connection with the second ejector pin hole.

[0010] Preferably, the fixing block is fixedly installed in the middle of the through groove. The sliding hole is opened in the middle of the outer surface of the upper end of the fixing block. The second ejector pin penetrates through the sliding hole. The middle of the outer surface of the lower end of the blanking block is fixedly connected with the outer surface of the upper end of the second ejector pin. The blanking block is located above the through groove. And the outer wall of the blanking block is in sliding connection with the through groove. The outer wall of the second ejector pin is in sliding connection with the sliding hole.

[0011] Preferably, the middle of the outer surface of the upper end of the limiting block is fixedly connected with the outer surface of the lower end of the second ejector pin. The second sealing ring is fixedly installed on the outer wall of the upper part of the limiting block. The outer wall of the lower part of the limiting block is inserted into the concave hole.

[0012] (III) Beneficial effects

[0013] Compared with the prior art, the utility model provides an ejection mechanism for a plastic mold, which has the following beneficial effects:

[0014] 1. For the ejection mechanism of the plastic mold, the secondary ejection structure is arranged, which is convenient for blanking the workpiece and avoids the workpiece adhering to the ejector pin.

[0015] 2. For the ejection mechanism of the plastic mold, the secondary ejection structure is arranged, which can apply a greater force to the workpiece during blanking and avoid the phenomenon that the workpiece adheres to the mold cavity and is difficult to be demolded. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of an ejection mechanism for a plastic mold according to the utility model.

[0017] Figure 2 It is a partial side view sectional view of an ejection mechanism for a plastic mold according to the utility model.

[0018] Figure 3 It is a schematic diagram of the structure of an ejection mechanism for a plastic mold according to the utility model Figure 2 after removing the secondary ejection structure.

[0019] Figure 4This is a schematic structural diagram of a secondary ejection structure in an ejection mechanism of a plastic mold of the present utility model after ejecting a workpiece.

[0020] Figure 5 This is a schematic structural diagram of a secondary ejection structure in an ejection mechanism of a plastic mold of the present utility model under normal conditions.

[0021] In the figure: 1, mold base; 2, lower mold; 3, upper mold; 4, top plate; 5, nozzle; 6, backing plate; 7, secondary ejection structure; 8, mold cavity; 9, first ejector pin hole; 10, cylindrical seat; 11, cavity; 12, concave hole; 13, gasket; 14, movable plate; 15, first sealing ring; 16, limit pin; 17, second ejector pin hole; 18, first hydraulic oil inlet and outlet valve; 19, second hydraulic oil inlet and outlet valve; 20, limit block; 21, second sealing ring; 22, compression spring; 23, fixed block; 24, sliding hole; 25, first ejector pin; 26, through groove; 27, ejector block; 28, second ejector pin. Specific embodiments

[0022] In order to make the technical means, creative features, achieved purposes and effects of the present utility model easy to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0023] This embodiment is an ejection mechanism of a plastic mold.

[0024] Such as Figures 1-5As shown in the figure, it includes a die holder 1, a lower die 2, an upper die 3, a top plate 4, a nozzle 5 and a backing plate 6. The lower die 2 is fixedly installed on the upper outer surface of the die holder 1. The upper die 3 is located above the lower die 2 and is fixedly installed on the lower outer surface of the top plate 4. The nozzle 5 is arranged in the middle of the upper outer surface of the top plate 4. The backing plate 6 is fixedly installed in the middle of the upper outer surface of the die holder 1. Four secondary ejection structures 7 are arranged at the four corners of the upper outer surface of the backing plate 6. A die cavity 8 is opened on the upper outer surface of the lower die 2. Four first ejector pin holes 9 are opened at the four corners of the bottom of the die cavity 8. The secondary ejection structure 7 includes a cylindrical seat 10, a cavity 11, a concave hole 12, a gasket 13, a movable plate 14, a first sealing ring 15, a limit pin 16, a second ejector pin hole 17, a first hydraulic oil inlet and outlet valve 18, a second hydraulic oil inlet and outlet valve 19, a limit block 20, a second sealing ring 21, a compression spring 22, a fixed block 23, a sliding hole 24, a first ejector pin 25, a through groove 26, a blanking block 27 and a second ejector pin 28. The lower outer surface of the cylindrical seat 10 is fixedly connected to the upper outer surface of the backing plate 6. The upper end of the first ejector pin 25 extends into the first ejector pin hole 9, and the outer wall of the first ejector pin 25 is slidably connected with the first ejector pin hole 9. The cavity 11 is opened inside the cylindrical seat 10. The second hydraulic oil inlet and outlet valve 19 is fixedly installed on the upper part of the outer surface of one side of the cylindrical seat 10. The first hydraulic oil inlet and outlet valve 18 is fixedly installed on the lower part of the outer surface of one side of the cylindrical seat 10. The second ejector pin hole 17 is opened in the middle of the upper outer surface of the cylindrical seat 10, and the second ejector pin hole 17 communicates with the cavity 11. The movable plate 14 and the limit pin 16 are both located in the cavity 11. The first sealing ring 15 is fixedly installed on the outer wall of the movable plate 14.

[0025] The number of limit pins 16 in a set of secondary ejection structures 7 is four groups. The four groups of limit pins 16 are fixedly installed at the four corners of the upper outer surface of the movable plate 14. The concave hole 12 is opened in the middle of the upper outer surface of the movable plate 14. The gasket 13 is fixedly installed in the middle of the concave hole 12. The first ejector pin 25 is fixedly installed in the middle of the upper outer surface of the movable plate 14. The through groove 26 is opened in the middle of the upper outer surface of the first ejector pin 25, and the concave hole 12 communicates with the through groove 26. The outer wall of the first ejector pin 25 is slidably connected with the second ejector pin hole 17. The fixed block 23 is fixedly installed in the middle of the through groove 26. The sliding hole 24 is opened in the middle of the upper outer surface of the fixed block 23. The second ejector pin 28 penetrates through the sliding hole 24. The middle of the lower outer surface of the blanking block 27 is fixedly connected to the upper outer surface of the second ejector pin 28. The blanking block 27 is located above the through groove 26, and the outer wall of the blanking block 27 is slidably connected with the through groove 26. The outer wall of the second ejector pin 28 is slidably connected with the sliding hole 24. The middle of the upper outer surface of the limit block 20 is fixedly connected to the lower outer surface of the second ejector pin 28. The second sealing ring 21 is fixedly installed on the outer wall of the upper part of the limit block 20. The lower outer wall of the limit block 20 is inserted into the concave hole 12.

[0026] It should be noted that the present utility model is an ejection mechanism for a plastic mold. The mold base 1, lower mold 2, backing plate 6, upper mold 3, top plate 4 and nozzle 5 described in the text all belong to the prior art and can be effectively known to those skilled in the technical field, and will not be elaborated here. After the upper mold 3 and the lower mold 2 are separated, the product remains in the mold cavity 8, and the product in the mold cavity 8 is demolded by the secondary ejection structure 7. The first hydraulic oil inlet and outlet valve 18 and the second hydraulic oil inlet and outlet valve 19 are both externally connected to an oil pump. First, hydraulic oil is injected into the interior of the cavity 11 through the first hydraulic oil inlet and outlet valve 18. The hydraulic oil pushes the movable plate 14 to move upward. The movable plate 14 drives the first ejector pin 25 to move along the second ejector pin hole 17, and the first ejector pin 25 moves along the first ejector pin hole 9 to eject the workpiece out of the mold cavity 8. When the upper outer surface of the limit pin 16 contacts the upper part of the cavity 11, the movable plate 14 cannot continue to move upward. Continuing to inject hydraulic oil into the interior of the cavity 11 through the first hydraulic oil inlet and outlet valve 18, due to continuous pressure, the hydraulic oil squeezes the lower outer surface of the limit block 20 through the concave hole 12. The limit block 20 drives the second ejector pin 28 to move along the sliding hole 24. At this time, the limit block 20 squeezes the compression spring 22, and the second ejector pin 28 drives the ejector block 27 to move out of the through groove 26, achieving the effect of secondary ejection, reducing the contact area between the workpiece and the ejector pin. When demolding, the mold is horizontally arranged. At this time, due to the gravity of the workpiece, the workpiece drops, realizing blanking and facilitating use. After that, first, the hydraulic oil in the cavity 11 is pumped out through the first hydraulic oil inlet and outlet valve 18. Due to the reset action of the compression spring 22, the ejector block 27 is driven to reset. Then, hydraulic oil is injected into the cavity 11 through the second hydraulic oil inlet and outlet valve 19, driving the movable plate 14 to descend along the cavity 11. The movable plate 14 drives the first ejector pin 25 to reset, and then the next set of injection molding starts.

[0027] It should be noted that in this article, relational terms such as first and second (No. 1, No. 2) are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or sequence between these entities or operations. Moreover, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

[0028] The above has shown and described the basic principles, main features and advantages of the present utility model. Those skilled in the art should understand that the present utility model is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and these changes and improvements all fall within the scope of the present utility model claimed.

Claims

1. A plastic mold ejection mechanism, comprising a mold base (1), a lower mold (2), an upper mold (3), a top plate (4), a nozzle (5) and a backing plate (6), wherein the lower mold (2) is fixedly installed on the outer surface of the upper end of the mold base (1), the upper mold (3) is located above the lower mold (2), the upper mold (3) is fixedly installed on the outer surface of the lower end of the top plate (4), the nozzle (5) is arranged in the middle of the outer surface of the upper end of the top plate (4), and the backing plate (6) is fixedly installed in the middle of the outer surface of the upper end of the mold base (1), and is characterized in that: Four secondary ejection structures (7) are provided at the four corners of the outer surface of the upper end of the backing plate (6). A mold cavity (8) is formed on the outer surface of the upper end of the lower mold (2). First ejector pin holes (9) are formed at the four corners of the bottom of the mold cavity (8). The secondary ejection structure (7) includes a cylindrical seat (10), a cavity (11), a concave hole (12), a sealing gasket (13), a movable plate (14), a first sealing ring (15), a limiting pin (16), a second ejector pin hole (17), a first hydraulic oil inlet / outlet valve (18), a second hydraulic oil inlet / outlet valve (19), a limiting block (20), a second sealing ring (21), a compression spring (22), a fixed block (23), a sliding hole (24), a first ejector pin (25), a through groove (26), a blanking block (27) and a second ejector pin (28). The lower outer surface of the cylindrical seat (10) is fixedly connected to the outer surface of the upper end of the backing plate (6). The upper end of the first ejector pin (25) extends into the first ejector pin hole (9). The outer wall of the first ejector pin (25) is in sliding connection with the first ejector pin hole (9). The cavity (11) is formed inside the cylindrical seat (10). The second hydraulic oil inlet / outlet valve (19) is fixedly installed on the upper part of the outer surface of one side of the cylindrical seat (10). The first hydraulic oil inlet / outlet valve (18) is fixedly installed on the lower part of the outer surface of one side of the cylindrical seat (10). The second ejector pin hole (17) is formed in the middle of the outer surface of the upper end of the cylindrical seat (10). The second ejector pin hole (17) communicates with the cavity (11). The movable plate (14) and the limiting pin (16) are both located in the cavity (11). The first sealing ring (15) is fixedly installed on the outer wall of the movable plate (14).

2. The ejection mechanism of a plastic mold according to claim 1, wherein: In a set of the secondary ejection structures (7), the number of the limiting pins (16) is four groups. The four groups of limiting pins (16) are fixedly installed at the four corners of the outer surface of the upper end of the movable plate (14). The concave hole (12) is formed in the middle of the outer surface of the upper end of the movable plate (14). The sealing gasket (13) is fixedly installed in the middle of the concave hole (12).

3. The ejection mechanism of a plastic mold according to claim 2, wherein: The first ejector pin (25) is fixedly installed in the middle of the outer surface of the upper end of the movable plate (14). The through groove (26) is formed in the middle of the outer surface of the upper end of the first ejector pin (25). The concave hole (12) communicates with the through groove (26). The outer wall of the first ejector pin (25) is in sliding connection with the second ejector pin hole (17).

4. The ejection mechanism of a plastic mold according to claim 3, characterized in that: The fixed block (23) is fixedly installed in the middle of the through groove (26). The sliding hole (24) is formed in the middle of the outer surface of the upper end of the fixed block (23). The second ejector pin (28) passes through the sliding hole (24). The middle of the lower outer surface of the blanking block (27) is fixedly connected to the outer surface of the upper end of the second ejector pin (28). The blanking block (27) is located above the through groove (26). The outer wall of the blanking block (27) is in sliding connection with the through groove (26). The outer wall of the second ejector pin (28) is in sliding connection with the sliding hole (24).

5. The ejection mechanism of a plastic mold according to claim 4, characterized in that: The middle of the outer surface of the upper end of the limit block (20) is fixedly connected to the outer surface of the lower end of the second ejector pin (28). The second sealing ring (21) is fixedly installed on the outer wall of the upper part of the limit block (20). The outer wall of the lower part of the limit block (20) is inserted into the concave hole (12).

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