Ejection structure for injection mold

Abstract

The utility model discloses an ejection structure for an injection mold, which comprises an upper mold assembly and a lower mold assembly, and the upper mold assembly comprises an upper mold plate and an upper mold core; the lower die assembly comprises a lower die plate, a lower die core and an ejector plate, the lower die core and the upper die core are closed to form a cavity, a rotating shaft is rotationally connected into the lower die plate through a bearing, the top end of the rotating shaft extends into the cavity and is provided with a thread forming part, the bottom end of the rotating shaft extends to the position below the lower die plate and is connected with a gear, and an ejector pin and a driving block are arranged at the top of the ejector plate. The top end of the driving block is provided with a driving slope, the bottom of the lower die plate is connected with a driven block through a horizontal sliding groove, the bottom end of the driven block is provided with a driven slope in contact fit with the driving slope, the driven block is connected with a rack in meshed connection with the gear, and a reset spring connected with the driven block is fixed in the horizontal sliding groove. The ejection structure for the injection mold can effectively eject and demold an injection product with threads, and has the advantages of being stable in work, safe and reliable.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of ejection structures for injection mold. BACKGROUND

[0002] Injection mold is the important component of injection molding machine, and the injection molding machine is injected into the cavity of injection mold by molten plastic, and the product with the shape required is obtained after cooling and forming.

[0003] When the existing injection mold processes injection product with thread, the product needs to be ejected and demolded after injection is completed. However, the ejection mechanism of the traditional injection mold is mostly to eject the injection product with thread directly by the ejector pin. Since the thread segment of the product is clamped by the core during the injection process, the demolding of the thread segment is relatively complex. If the forced demolding is adopted, the thread is easily damaged, and the product is easily cracked, which affects the quality of subsequent product production. Therefore, a corresponding technical solution needs to be designed to solve the above problems. SUMMARY

[0004] The utility model aims at providing a kind of ejection structures for injection mold, which is reasonable in structure, can effectively eject the injection product with thread, and has the advantages of stable work, safety and reliability.

[0005] To achieve the above-mentioned purpose, the technical scheme of the utility model is to design an ejection structure for injection mold, which comprises an upper die assembly and a lower die assembly.

[0006] The upper die assembly comprises an upper die plate and an upper die core, and the upper die core is arranged at the bottom of the upper die plate.

[0007] The lower die assembly comprises a lower die plate, a lower die core and an ejection plate. The lower die core is arranged at the top of the lower die plate, and the lower die core and the upper die core form a cavity. A rotating shaft is rotatably connected to the lower die plate through a bearing. The top end of the rotating shaft extends into the cavity and is provided with a thread forming part. The bottom end of the rotating shaft extends below the lower die plate and is connected to a gear. The ejection plate is arranged below the lower die plate, and the top of the ejection plate is provided with an ejector pin. The top end of the ejector pin extends into the cavity. The top of the ejection plate is provided with a driving block. The top end of the driving block is provided with a driving slope. The bottom of the lower die plate is connected to a driven block through a horizontal sliding slot. The bottom end of the driven block is provided with a driven slope which is in contact with the driving slope. The driven block is connected to a rack which is in meshing connection with the gear. A return spring connected to the driven block is fixed in the horizontal sliding slot.

[0008] Preferably, the top end of the ejector pin is provided with a clamping protrusion.

[0009] Preferably, the upper die assembly further comprises a panel, and the upper die plate is arranged at the bottom of the panel.

[0010] Preferably, the lower die assembly further comprises a bottom plate, the bottom plate is arranged below the ejection plate, and a square iron is connected between the bottom plate and the lower die plate.

[0011] Preferably, the bottom of the bottom plate is provided with a driving oil cylinder, an output shaft of the driving oil cylinder penetrates through the bottom plate and is connected with the ejection plate.

[0012] The utility model discloses the advantages and beneficial effects lie in: provide a kind of for the ejection structure of injection mold, its structure is reasonable, can effectively eject the injection product with thread demoulding, and with the advantages of stable work, safe and reliable. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is the schematic diagram of the utility model.

[0014] Figure 2 It is Figure 1 The enlarged view of A in Fig.

[0015] Figure 3 It is Figure 1 The enlarged view of B in Fig. DETAILED DESCRIPTION

[0016] The specific embodiment of the utility model is further described below in combination with the drawings and examples. The following examples are only used to more clearly illustrate the technical scheme of the utility model, and cannot limit the protection scope of the utility model.

[0017] The technical scheme of the embodiment of the utility model is:

[0018] As shown in Fig. Figure 1 , Figure 2 and Figure 3 A kind of ejection structure for injection mold, including upper die assembly and lower die assembly:

[0019] The upper die assembly includes upper die plate 2 and upper die kernel 3, and the upper die kernel 3 is arranged at the bottom of upper die plate 2.

[0020] The lower die assembly comprises a lower die plate 4, a lower die core 5 and an ejection plate 6, the lower die core 5 is arranged on the top of the lower die plate 4, and the lower die core 5 is closed with the upper die core 3 to form a cavity, a rotating shaft 7 is rotatably connected to the lower die plate 4 through a bearing, the top end of the rotating shaft 7 extends into the cavity and is provided with a threaded forming part, and the bottom end of the rotating shaft 7 extends below the lower die plate 4 and is connected with a gear 8, the ejection plate 6 is arranged below the lower die plate 4, and the top of the ejection plate 6 is provided with a ejector pin 9, the top end of the ejector pin 9 extends into the cavity, the top of the ejection plate 6 is provided with a driving block 10, the top end of the driving block 10 is provided with a driving slope 11, the bottom of the lower die plate 4 is connected with a driven block 13 through a horizontal sliding slot 12, the bottom end of the driven block 13 is provided with a driven slope 14 in contact with the driving slope 11, and the driven block 13 is connected with a rack 15 engaged with the gear 8, and the horizontal sliding slot 12 is fixed with a return spring 16 connected with the driven block 13.

[0021] Further, the top end of the ejector pin 9 is provided with a clamping convex 17.

[0022] Further, the upper die assembly further comprises a panel 1, and the upper die plate 2 is arranged on the bottom of the panel 1.

[0023] Further, the lower die assembly further comprises a bottom plate 18, and the bottom plate 18 is arranged below the ejection plate 6, and a square iron 19 is connected between the bottom plate 18 and the lower die plate 4.

[0024] Further, the bottom of the bottom plate 18 is provided with a driving oil cylinder 20, and the output shaft of the driving oil cylinder 20 penetrates the bottom plate 18 and is connected with the ejection plate 6.

[0025] The working principle of the ejection structure for the injection mold is as follows:

[0026] When the upper die assembly and the lower die assembly are closed, the upper die core 3, the lower die core 5 and the threaded forming part of the rotating shaft 7 cooperate to form a threaded injection product 100;

[0027] When the upper die assembly and the lower die assembly are opened, the upper die assembly is separated from the lower die assembly by setting the distance of the upward movement of the upper die assembly, then the driving oil cylinder 20 is controlled to extend to drive the ejection plate 6 and the ejector pin 9 to move upward, when the ejector pin 9 moves upward, the injection product 100 can be ejected and demolded, at the same time, the ejection plate 6 moves upward to drive the rack 15 to move through the cooperation of the driving block 10 and the driven block 13, the rack 15 drives the gear 8 and the rotating shaft 7 to rotate, and then the threaded forming part of the rotating shaft 7 is rotated out of the injection product 100, so that the injection product 100 can be smoothly demolded.

[0028] The above merely is the preferred implementation manner of the present application, and it should be noted that, for the ordinary skilled in the art, without departing from the technical principles of the present application, a number of improvements and refinements can be made, and these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. An ejection structure for an injection mold, comprising an upper mold assembly and a lower mold assembly, characterized in that: the upper mold assembly comprises an upper mold plate and an upper mold core, the upper mold core being arranged at the bottom of the upper mold plate; the lower mold assembly comprises a lower mold plate, a lower mold core and an ejection plate, the lower mold core being arranged at the top of the lower mold plate, the lower mold core and the upper mold core forming a cavity when closed, a rotating shaft being rotatably connected to the lower mold plate through a bearing, the top end of the rotating shaft extending into the cavity and being provided with a threaded forming part, the bottom end of the rotating shaft extending below the lower mold plate and being connected to a gear, the ejection plate being arranged below the lower mold plate, the top of the ejection plate being provided with an ejector pin, the top end of the ejector pin extending into the cavity, the top of the ejection plate being provided with a driving block, the top end of the driving block being provided with a driving slope, the bottom of the lower mold plate being connected to a driven block through a horizontal sliding slot, the bottom end of the driven block being provided with a driven slope in contact with the driving slope, the driven block being connected to a rack in meshing connection with the gear, a return spring connected to the driven block being fixed in the horizontal sliding slot.

2. The ejection structure for an injection mold according to claim 1, characterized in that, the top end of the ejector pin is provided with a clamping protrusion.

3. The ejection structure for an injection mold according to claim 1, characterized in that, the upper mold assembly further comprises a panel, the upper mold plate being arranged at the bottom of the panel.

4. The ejection structure for an injection mold according to claim 1, characterized by, the lower mold assembly further comprises a bottom plate, the bottom plate being arranged below the ejection plate, a square iron being connected between the bottom plate and the lower mold plate.

5. The ejection structure for an injection mold according to claim 4, characterized in that, the bottom of the bottom plate is provided with a driving oil cylinder, the output shaft of the driving oil cylinder penetrating through the bottom plate and being connected to the ejection plate.

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