Simple three-stage ejection structure

Abstract

The utility model discloses a simple three-stage ejection structure which comprises a bottom plate, square iron, a plate B, a rear mold core mounted in the plate B, a first ejector base plate, a first ejector retainer plate, a second ejector base plate and a second ejector retainer plate, the first ejector base plate is arranged on the bottom plate, and the first ejector retainer plate is arranged on the first ejector base plate; a first mounting hole is formed in the first ejector base plate, and a second mounting hole is formed in a position, corresponding to the first mounting hole, of the first ejector retainer plate; the second ejector base plate is movably arranged in the first mounting hole, and the second ejector retainer plate is movably arranged in the second mounting hole and located on the top of the second ejector base plate. The ejection mechanism can effectively solve the problem of difficult piece taking caused by the fact that the periphery of a product is separated from a large push block in the ejection process of the deep-cavity product, and reduces the problem that waste products are generated due to ejection failure, thereby improving the production efficiency.

Description

Technical Field

[0001] This utility model relates to the field of plastic mold technology, and in particular to a simple three-stage ejection structure. Background Technology

[0002] In plastic molds, many products have deep cavity structures with numerous deep ribs and pillars. Traditional ejection methods present several problems for these products. For example, a conventional single-stage ejection structure can lead to difficulties in part removal because the outer periphery of the part easily detaches from the large ejector plate, and the ejector sleeves under the pillars can break due to excessive force. Furthermore, while a conventional two-stage ejection structure (using four ejector plates) can partially solve the part removal problem, it significantly increases the mold thickness, leading to a more complex mold structure, higher costs, reduced production efficiency, and a shorter mold lifespan. Utility Model Content

[0003] The purpose of this utility model is to provide a simple three-stage ejection structure that can effectively solve the problem of difficult part removal caused by the outer periphery of the product detaching from the large push block during the ejection process of deep cavity products, reduce the problem of scrap due to ejection failure, thereby improving production efficiency. Compared with the traditional two-stage ejection structure, the three-stage ejection structure of this application avoids a significant increase in mold thickness, reduces the amount of mold material used, and thus reduces the manufacturing cost of the mold.

[0004] To achieve the above objectives, the following technical solution is adopted:

[0005] A simplified three-stage ejection structure includes a base plate, a square iron plate, a B plate, and a rear mold core installed within the B plate. It also includes a first bottom pin plate, a first top pin plate, a second bottom pin plate, and a second top pin plate. The first bottom pin plate is disposed on the base plate, and the first top pin plate is disposed on the first bottom pin plate. A first mounting hole is formed on the first bottom pin plate, and a second mounting hole is formed on the first top pin plate corresponding to the first mounting hole. The second bottom pin plate is movably disposed within the first mounting hole, and the second top pin plate is movably disposed within the second mounting hole and located on top of the second bottom pin plate. A push rod is installed on the first bottom pin plate, passing through the first top pin plate. An ejector block is connected to the top of the push rod, and the ejector block is movably fitted onto the rear mold core. Ejector rod assemblies are also installed on the second bottom pin plate and the second top pin plate, and the upper part of the ejector rod assembly... The part moves through the rear mold core arrangement; a guide rod is also connected between the base plate and the B plate, and the guide rod moves through the first bottom pin plate and the first face pin plate arrangement; a first mounting groove is opened on the first bottom pin plate, and one end of the first mounting groove extends into the first mounting hole; a movable block is also movably arranged in the first mounting groove, and a first through hole is opened on the top of the movable block, extending to its bottom; an ejector pad is also installed on the second bottom pin plate at the position corresponding to the movable block, and one end of the movable block extends to the bottom of the ejector pad arrangement; the guide rod moves through the first through hole arrangement, and a first notch is opened vertically on the outer wall of the lower part of the guide rod near the other end of the movable block; the top of the first notch is an upward inclined surface; a yellow spring is also connected between the other end outer wall of the movable block and the other end inner wall of the first mounting groove.

[0006] Furthermore, a partition is also connected to the inner wall of the other end of the first mounting groove; the yellow spring is provided in two sets, and the partition is located between the two sets of yellow springs.

[0007] Furthermore, a limiting groove is formed on one side of the outer wall of the movable block along the length of the movable block; a limiting hole is formed on the inner wall of the first mounting groove near the limiting groove, and a limiting block is also installed in the limiting hole; one end of the limiting block is inserted into the limiting groove.

[0008] Furthermore, a second notch is provided on one side of the outer wall of the second bottom needle plate, corresponding to the first mounting groove, and one end of the movable block is inserted into the second notch; a third notch is provided on the bottom of the second face needle plate, corresponding to the second notch, and the third notch and the top of the second bottom needle plate form a receiving groove; the ejector pad is arranged in the receiving groove; the ejector pad has an L-shaped structure, the vertical end of the ejector pad is connected to the top of the second bottom needle plate, and the horizontal end of the ejector pad extends to the top of the second notch.

[0009] Furthermore, a first limiting post is also installed on the second needle plate.

[0010] Furthermore, a second limiting post is also installed on the first needle plate.

[0011] Furthermore, a connecting post is also installed on the first base plate, and the lower part of the connecting post passes through the base plate.

[0012] By adopting the above solution, the beneficial effects of this utility model are:

[0013] This invention can effectively solve the problem of difficult part removal caused by the outer periphery of the product detaching from the large push block during the ejection process of deep cavity products, reduce the problem of scrap due to ejection failure, thereby improving production efficiency. Compared with the traditional two-stage ejection structure, the three-stage ejection structure of this application avoids a significant increase in mold thickness, reduces the amount of mold material used, and thus reduces the manufacturing cost of the mold. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 This is a cross-sectional view of the present invention;

[0016] Figure 3 This is a schematic diagram of the structure of this utility model omitting plate B;

[0017] Figure 4 for Figure 3 A structural diagram omitting some structural elements;

[0018] Figure 5 for Figure 4 A structural diagram omitting the first needle plate;

[0019] Figure 6 for Figure 5 A partially enlarged structural diagram;

[0020] Figure 7 This is a schematic diagram of the structure of the second bottom needle plate and the second front needle plate of this utility model;

[0021] Figure 8 This is a structural diagram of the product;

[0022] The following are explanations of the labels in the attached diagram:

[0023] 1. Base plate; 2. Square iron; 3. B plate; 4. Rear mold core; 5. First bottom pin plate; 6. First surface pin plate; 7. Second bottom pin plate; 8. Second surface pin plate; 11. Guide rod; 12. First notch; 13. Inclined surface; 51. Push block rod; 52. Ejector block; 53. First mounting groove; 54. Movable block; 55. Yellow spring; 56. Partition plate; 57. Limiting groove; 58. Limiting block; 59. Connecting post; 61. Second limiting post; 71. Ejector pad; 72. Second notch; 81. First limiting post. Detailed Implementation

[0024] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] Reference Figure 8 As shown, the product targeted by this utility model is a coffee machine housing made of PP material, which is an exterior part. The four outer sides of the product are formed by rear mold sliding. There are three undercut positions in the middle of the product formed by inclined ejector. There are multiple pillar positions and reinforcing ribs in the middle of the product that are ejected by ejector sleeves and ejector pins. There is a deep rib position in the middle of the product that is ejected by a straight ejector. The outer periphery of the product is ejected by a large push block (i.e., ejector block 52 in this application). When the A / B plate is opened, the left and right sliding parts achieve core pulling under the action of inclined guide pillars. After the A / B plate is fully opened, the top and bottom sliding parts achieve core pulling under the action of hydraulic cylinders. Because the product is made of PP material, the periphery is thin-walled, and the product is also a deep cavity, the product will shrink significantly and detach from the surface of the large push block during the sliding part core pulling process. The measured distance of the product detaching from the surface of the large push block is 2.10mm.

[0026] To solve this problem, refer to Figures 1 to 7As shown, this utility model provides a simplified three-stage ejection structure, including a base plate 1, a square iron 2, a B plate 3, and a rear mold core 4 installed in the B plate 3. In one embodiment, it further includes a first bottom pin plate 5, a first front pin plate 6, a second bottom pin plate 7, and a second front pin plate 8. The first bottom pin plate 5 is arranged on the base plate 1, and the first front pin plate 6 is arranged on the first bottom pin plate 5. A first mounting hole is opened on the first bottom pin plate 5, and a second mounting hole is opened on the first front pin plate 6 at a position corresponding to the first mounting hole. The second bottom pin plate 7 is movably arranged in the first mounting hole, and the second front pin plate 8 is movably arranged in the second mounting hole and located on top of the second bottom pin plate 7. A push rod 51 is installed on the first bottom pin plate 5, passing through the first front pin plate 6. An ejector block 52 is connected to the top of the push rod 51, and the ejector block 52 is movably sleeved on the rear mold core 4. An ejector rod assembly is also installed on the second bottom pin plate 7 and the second front pin plate 8, and the upper part of the ejector rod assembly... The part moves through the rear mold core 4; a guide rod 11 is also connected between the base plate 1 and the B plate 3, and the guide rod 11 moves through the first bottom pin plate 5 and the first face pin plate 6; the first bottom pin plate 5 has a first mounting groove 53, and one end of the first mounting groove 53 extends into the first mounting hole; a movable block 54 is also movably arranged in the first mounting groove 53, and the top of the movable block 54 has a first through hole extending to its bottom; an ejector pad 71 is also installed on the second bottom pin plate 7 at the position corresponding to the movable block 54, and one end of the movable block 54 extends to the bottom of the ejector pad 71; the guide rod 11 moves through the first through hole, and the lower part of the guide rod 11 near the other end of the movable block 54 has a first notch 12 in the vertical direction on the outer wall; the top of the first notch 12 is an upward inclined surface 13; a yellow spring 55 is also connected between the other end of the movable block 54 and the other end of the inner wall of the first mounting groove 53.

[0027] In this embodiment, the ejector block 52 is the aforementioned large pusher block. The ejector rod assembly includes the aforementioned inclined pusher, straight pusher, ejector sleeve, ejector plate, etc., which are set according to the actual situation of the product. Meanwhile, the aforementioned core-pulling structure can use existing mechanisms. This utility model mainly relates to the ejector structure. In this embodiment, there are two sets of guide rods 11, located on the top two sides of the base plate 1 respectively (correspondingly, there are also two sets of movable blocks 54 and their related structures). There are four sets of pusher rods 51, which can be freely adjusted according to actual use.

[0028] Meanwhile, preferably, a partition plate 56 is also connected to the inner wall of the other end of the first mounting groove 53; two sets of yellow springs 55 are provided, and the partition plate 56 is located between the two sets of yellow springs 55; a limiting groove 57 is formed on one side of the outer wall of the movable block 54 along the length direction of the movable block 54; a limiting hole is formed on the inner wall of the first mounting groove 53 near the limiting groove 57, and a limiting block 58 is also installed in the limiting hole; one end of the limiting block 58 is inserted into the limiting groove 57; one side of the outer wall of the second bottom pin plate 7 is connected to the first A second notch 72 is also provided at the corresponding location of the mounting slot 53, and one end of the movable block 54 is inserted into the second notch 72; a third notch is provided at the bottom of the second face pin plate 8 at the corresponding location of the second notch 72, and the third notch and the top of the second bottom pin plate 7 form a receiving groove; the ejector pad 71 is arranged in the receiving groove; the ejector pad 71 has an L-shaped structure, the vertical end of the ejector pad 71 is connected to the top of the second bottom pin plate 7, and the horizontal end of the ejector pad 71 extends to the top of the second notch 72.

[0029] In addition, a first limiting post 81 is installed on the second needle plate 8; a second limiting post 61 is installed on the first needle plate 6; and a connecting post 59 is installed on the first bottom needle plate 5, with the lower part of the connecting post 59 passing through the bottom plate 1. The number of the first limiting post 81, the second limiting post 61, and the connecting post 59 is adaptively set according to the actual situation.

[0030] The working principle of this utility model:

[0031] The ejector rod of the injection molding machine is connected to the connecting post 59 (KO connecting rod) on the first bottom needle plate 5, which can drive the first bottom needle plate 5, the first top needle plate 6, and the ejector block 52 to move. When the ejection distance is 2.10mm, the ejector block 52 is in contact with the bottom surface of the product, realizing the first stage of ejection. At this time, one end of the movable block 54 also just contacts the bottom of the ejection pad 71. Subsequently, the ejector rod of the injection molding machine, the first bottom needle plate 5, the first top needle plate 6, and the ejector block 52 continue to move, while the movable block 54 and the ejector block 71 move together. Under the action of the pad 71, the second bottom needle plate 7, the second front needle plate 8, and the push rod assembly (slanted push, straight push, ejector sleeve, and ejector plate) on them can be pushed out, with a pushing distance of 130mm (the pushing distance is controlled by the first limit post 81), realizing the second stage of pushing out. At this time, the movable block 54 moves to the inclined surface 13 (inclined step) of the guide rod 11. Affected by the resistance of the inclined surface 13, the movable block 54 will move towards the yellow spring 55 and squeeze the yellow spring 55, so that the movable block 54 moves from the second The movable block 54 is pulled out from the notch 72, meaning one end of the movable block 54 no longer abuts the bottom of the ejector block 71 (the movement distance of the movable block 54 is controlled by the limit block 58 and reset by the yellow spring 55); subsequently, the injection molding machine ejector rod, the first bottom pin plate 5, the first top pin plate 6, and the ejector block 52 move. At this time, because the movable block 54 is pulled out from the second notch 72, it no longer applies an upward lifting force to the ejector block 71. Therefore, the second bottom pin plate 7, the second top pin plate 8, and the inclined ejector, straight ejector, ejector sleeve, and ejector pin on them are... When the product is ejected to 250mm (controlled by the second limit post 61), the ejection action is completed, realizing the third stage of ejection. At this time, the product can be easily removed from the ejector block 52. Finally, under the action of the ejector rod of the injection molding machine, the first bottom needle plate 5, the first front needle plate 6 and the ejector block 52 are pulled, which in turn drives the second bottom needle plate 7, the second front needle plate 8 and the inclined ejector, straight ejector, sleeve and ejector pin on them to reset, thus entering the next working cycle to meet the normal ejection and production needs of this type of product.

[0032] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A simplified three-stage ejection structure, comprising a base plate, a square iron plate, a B plate, and a rear mold core installed within the B plate, characterized in that, It also includes a first bottom needle plate, a first front needle plate, a second bottom needle plate, and a second front needle plate; the first bottom needle plate is arranged on the bottom plate, and the first front needle plate is arranged on the first bottom needle plate; the first bottom needle plate has a first mounting hole, and the first front needle plate has a second mounting hole corresponding to the first mounting hole; the second bottom needle plate is movably arranged in the first mounting hole, and the second front needle plate is movably arranged in the second mounting hole and located on top of the second bottom needle plate; a push rod is installed on the first bottom needle plate, passing through the first front needle plate, and an ejector block is connected to the top of the push rod, the ejector block being movably sleeved on the rear mold core; the second bottom needle plate and the second front needle plate are also equipped with ejector rod assemblies, and the upper part of the ejector rod assembly movably passes through the rear mold core; the bottom plate and the B plate A guide rod is connected between them, and the guide rod moves through the first bottom needle plate and the first top needle plate. The first bottom needle plate has a first mounting groove, and one end of the first mounting groove extends into the first mounting hole. A movable block is also movably arranged in the first mounting groove, and the top of the movable block has a first through hole extending to its bottom. A push-out pad is also installed on the second bottom needle plate at the position corresponding to the movable block, and one end of the movable block extends to the bottom of the push-out pad. The guide rod moves through the first through hole, and the lower part of the guide rod near the other end of the movable block has a first notch in the vertical direction on its outer wall. The top of the first notch is an upward inclined surface. A yellow spring is also connected between the other end of the movable block's outer wall and the other end of the first mounting groove's inner wall.

2. The simplified three-stage ejection structure according to claim 1, characterized in that, A partition is also connected to the inner wall of the other end of the first mounting groove; two sets of yellow springs are provided, and the partition is located between the two sets of yellow springs.

3. The simplified three-stage ejection structure according to claim 1, characterized in that, A limiting groove is formed on one side of the outer wall of the movable block along the length of the movable block; a limiting hole is formed on the inner wall of the first mounting groove near the limiting groove, and a limiting block is also installed in the limiting hole; one end of the limiting block is inserted into the limiting groove.

4. The simplified three-stage ejection structure according to claim 3, characterized in that, A second notch is provided on one side of the outer wall of the second bottom needle plate, corresponding to the first mounting groove, and one end of the movable block is inserted into the second notch; a third notch is provided on the bottom of the second face needle plate, corresponding to the second notch, and the third notch and the top of the second bottom needle plate form a receiving groove; the ejector pad is arranged in the receiving groove; the ejector pad has an L-shaped structure, the vertical end of the ejector pad is connected to the top of the second bottom needle plate, and the horizontal end of the ejector pad extends to the top of the second notch.

5. The simplified three-stage ejection structure according to claim 1, characterized in that, The second needle plate is also equipped with a first limiting post.

6. The simplified three-stage ejection structure according to claim 5, characterized in that, The first needle plate is also equipped with a second limiting post.

7. The simplified three-stage ejection structure according to claim 6, characterized in that, The first base plate is also equipped with a connecting post, and the lower part of the connecting post passes through the base plate.

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