Oil cylinder anti-retreating structure and die

Abstract

The utility model discloses an oil cylinder anti-retreating structure and a mold in the technical field of injection molds, which comprise a mold frame, a first sliding block, a first oil cylinder for driving the first sliding block to move back and forth along the demolding direction, a first shovel arranged on the moving path of the first sliding block and used for limiting the first sliding block from retreating, and a shovel brake block connected with the first shovel in a sliding manner, and the second oil cylinder is used for driving the chicken shoveling brake block to reciprocate along the horizontal direction. The side wall of the first shovel is sleeved with a guide block, and reciprocating motion in the vertical direction is achieved under limiting of the guide block. By means of the structural design, the sliding block can be effectively prevented from retreating due to the injection pressing effect in the injection molding process, the defects of burrs, strain and the like of a product are overcome, and the operation reliability of a mold and the forming quality of the product are improved.

Description

Technical Field

[0001] This utility model relates to a hydraulic cylinder anti-reverse structure and mold, belonging to the field of injection mold technology. Background Technology

[0002] The front mold slider is a common structure in injection molding. It's designed to be mounted on the front mold side based on the product's structural characteristics. During injection molding, the front mold slider must disengage from the product's undercut before the injection molding machine opens the front and rear molds. Otherwise, the product may be damaged during mold opening, or even fail to demold properly. This is because the power for mold opening comes directly from the moving mold side of the injection molding machine. When the mold opens, the product needs to remain on the moving mold side, and then the ejector pins on the moving mold side of the injection molding machine push the ejector plate to eject the product from the cavity. This requires the front mold slider to completely disengage from the product's undercut before mold opening. Mold design typically employs two structural solutions: one is a three-plate mold structure to drive the front mold slider and ensure it disengages from the product's undercut before mold opening. The mold base uses a three-plate, two-stage parting line. Before the front and rear molds open, the mother mold plate and the mold plate behind it undergo a first mold opening parting line to ensure the front mold slider disengages from the product's undercut before the second mold opening parting line opens the front and rear molds. Its advantage is that it uses a mechanical scraper, which ensures the slider can withstand the injection pressure and will not move backward. Its disadvantage is that it not only increases mold costs and production cycle, but also increases the machine tonnage cost due to the increased mold thickness caused by the three-plate structure.

[0003] Another approach is to design a two-plate mold structure, typically using a hydraulic cylinder to drive the front mold slide to ensure it detaches from the product's undercut before mold opening. The mold base uses a two-plate, one-step parting line. Before the front and rear molds open and part, a hydraulic cylinder is used to drive and ensure the front mold slide detaches from the product's undercut. Compared to a three-plate structure, its advantages are simpler mold structure, lower cost, shorter production cycle, and no increase in machine tonnage costs due to mold thickness. Its disadvantage is that because a hydraulic cylinder is used to drive and stop the slide, the cylinder may retract due to high injection pressure during production, leading to defects such as burrs and scratches on the product.

[0004] Compared to the three-plate structure, the two-plate structure has lower cost and shorter cycle time. In particular, it is popular in factories because it does not require an increase in machine tonnage due to mold height. However, the problem of burrs and other defects caused by the hydraulic cylinder retracting under pressure also plagues factories, which requires additional labor costs to reduce burrs.

[0005] To address this, a hydraulic cylinder anti-reverse structure and mold are proposed. Utility Model Content

[0006] The purpose of this utility model is to overcome the shortcomings of the existing technology and solve the problem that in the two-plate mold structure, the oil cylinder drives the slider to retreat when subjected to high injection pressure, resulting in burrs, scratches or failure to demold smoothly.

[0007] To solve the above-mentioned technical problems, this utility model is implemented using the following technical solution:

[0008] In a first aspect, a hydraulic cylinder anti-retraction structure is provided, including a mold frame, a first slider, a first hydraulic cylinder for driving the first slider to reciprocate along the demolding direction, a first shovel provided on the movement path of the first slider for limiting the retraction of the first slider, a shovel brake block slidably connected to the first shovel, and a second hydraulic cylinder for driving the shovel brake block to reciprocate along the horizontal direction.

[0009] The first hydraulic cylinder is connected to the first slider via a first hydraulic cylinder connecting rod; the second hydraulic cylinder is connected to the chicken shovel brake block via a second hydraulic cylinder connecting rod.

[0010] The first shovel chicken is fitted with a first guide block on its side wall, and the first shovel chicken achieves vertical reciprocating motion under the limitation of the first guide block.

[0011] Furthermore, the chicken-shovel brake block is connected to the first chicken in a T-shape, and the side of the chicken-shovel brake block that is in contact with the first chicken is set as an inclined surface.

[0012] Furthermore, a second guide block is fitted to one end of the first guide block, and the second guide block is fixedly connected to the mold frame.

[0013] Furthermore, the first hydraulic cylinder and the second hydraulic cylinder are respectively fixed in the first hydraulic cylinder bracket and the second hydraulic cylinder bracket, and both the first hydraulic cylinder bracket and the second hydraulic cylinder bracket are installed inside the mold frame.

[0014] Furthermore, the two sidewalls of the first slider are provided with first pressure strips facing each other.

[0015] Secondly, another hydraulic cylinder anti-retraction structure is provided, including a mold frame, a second slider, a third hydraulic cylinder for driving the second slider to reciprocate along the demolding direction, a second shovel provided above the tail of the second slider for limiting the retraction of the second slider, and a shouldered screw for guiding the second shovel to move along its axial direction.

[0016] The shoulder screw is fixedly connected to the mold frame; the third oil cylinder is connected to the second slider through the third oil cylinder connecting rod, and the tail of the second slider is provided with a sliding groove, and the third oil cylinder connecting rod has a reserved stroke space in the sliding groove;

[0017] The side wall of the shoulder screw is fitted with a spring, which is used to push the second shovel chicken to the stop position when the mold is closed;

[0018] The second shovel chicken is fitted with a third guide block on its side wall, which is used to guide the direction of the second shovel chicken during movement.

[0019] Furthermore, the spring is a compression spring and is disposed between the second shovel and the mold.

[0020] Furthermore, the two side walls of the second slider are provided with second pressure strips facing each other;

[0021] The two opposing sidewalls of the second slider are respectively provided with slots, the slots are connected to the slide groove, and a brake pin is slidably connected in the slot;

[0022] The side wall of the second pressure strip is provided with a V-shaped notch that engages with the brake pin, and the second pressure strip engages with the brake pin through the V-shaped notch.

[0023] Furthermore, the third hydraulic cylinder is fixed in a third hydraulic cylinder bracket, and the third hydraulic cylinder bracket is installed inside the mold frame.

[0024] Thirdly, a mold is provided, including a mold assembly and a front mold slider disposed in the mold assembly, wherein there are at least two front mold sliders, each front mold slider being equipped with an independent hydraulic cylinder anti-reverse structure; the hydraulic cylinder anti-reverse structure includes the hydraulic cylinder anti-reverse structure as described in the first aspect and / or the hydraulic cylinder anti-reverse structure as described in the second aspect.

[0025] Compared with the prior art, the beneficial effects achieved by this utility model are as follows:

[0026] This invention effectively solves the problem of excessive injection pressure causing slide retraction in traditional two-plate molds, which leads to burrs, scratches, or demolding failure in products, by setting a shovel on the path of the slide driven by the hydraulic cylinder and controlling the shovel with the hydraulic cylinder. The shovel has the advantages of clear restriction direction, reliable locking, and rapid response. With the help of the guide block, it can ensure its stable movement trajectory during operation and improve the repeatability and consistency of the anti-retraction action. Attached Figure Description

[0027] Figure 1 The figure shown is a plan view of the front mold side in the assembled state of the front mold slider of the two-plate mold structure provided by this utility model;

[0028] Figure 2 The figure shown is a plan view of the rear mold side in the assembled state of the front mold slider of the two-plate mold structure provided by this utility model.

[0029] Figure 3 The figure shown is a Y-axis sectional view of the front mold slider assembly state of the two-plate mold structure provided by this utility model.

[0030] Figure 4 The image shown is a partial enlargement of the front mold slider assembly state of the two-plate mold structure provided by this utility model. Figure 1 ;

[0031] Figure 5 The image shown is a partial enlargement of the front mold slider assembly state of the two-plate mold structure provided by this utility model. Figure 2 ;

[0032] Figure 6 The image shown is an unequal angle view of the front and rear mold sides in the assembled state of the front mold slider of the two-plate mold structure provided by this utility model.

[0033] Figure 7 The image shown is an unequal angle view of the front mold slider of the two-plate mold structure provided by this utility model;

[0034] Figure 8 The figure shown is an exploded view of the front mold slider of the two-plate mold structure provided in Embodiment 1 of this utility model;

[0035] Figure 9 The image shown is an exploded view of the front mold slider of the two-plate mold structure provided in Embodiment 1 of this utility model.

[0036] Figure label:

[0037] 1. First slider; 2. First pressure bar; 3. First cylinder bracket; 4. First cylinder; 5. First cylinder connecting rod; 6. First shovel; 7. First guide block; 8. Second cylinder; 9. Second cylinder connecting rod; 10. Shovel brake block; 11. Second guide block; 12. Second cylinder bracket; 13. Mold frame; 14. Second slider; 15. Third cylinder; 16. Second shovel; 17. Shoulder screw; 18. Third cylinder connecting rod; 19. Slide groove; 20. Spring; 21. Third guide block; 22. Second pressure bar; 23. Slot; 24. Brake pin; 25. V-shaped notch; 26. Third cylinder bracket. Detailed Implementation

[0038] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0039] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Example

[0040] like Figure 1 , Figure 2 and Figure 3As shown, a hydraulic cylinder anti-reverse structure is provided, which is mainly suitable for the first slider 1 with a large projected area, such as... Figure 4 and Figure 6 As shown, the structure includes a mold frame 13, a first slider 1, a first hydraulic cylinder 4 for driving the first slider 1 to reciprocate along the demolding direction, a first shovel 6 disposed on the movement path of the first slider 1 to limit the retraction of the first slider 1, a shovel brake block 10 slidably connected to the first shovel 6, and a second hydraulic cylinder 8 for driving the shovel brake block 10 to reciprocate along the horizontal direction; the first hydraulic cylinder 4 is connected to the first slider 1 through a first hydraulic cylinder connecting rod 5; the second hydraulic cylinder 8 is connected to the shovel brake block 10 through a second hydraulic cylinder connecting rod 9;

[0041] like Figure 7 and Figure 8 As shown, when the second hydraulic cylinder 8 is working, the shovel brake block 10 is pushed by the connecting rod 9 of the second hydraulic cylinder. The shovel brake block 10 moves horizontally at this time. Since the side of the shovel brake block 10 that is in contact with the first shovel 6 is set as an inclined surface, the first shovel 6 and the shovel brake block 10 are connected by an inclined T-shape, so that the shovel can move vertically. The first guide block 7 is sleeved on the side wall of the first shovel 6. One end of the first guide block 7 is equipped with a second guide block 11. The second guide block 11 is fixedly connected to the mold frame 13. The second guide block 11 is used to prevent the shovel brake block 10 from being pulled out of the corresponding slot on the mold frame by the second hydraulic cylinder 8 when the mold is open. The first guide block 7 only reserves space to allow the first shovel 6 to move back and forth in the vertical direction. When the second hydraulic cylinder 8 is working, when the shovel brake block 10 moves horizontally, the shovel can move vertically, thereby limiting the first slider 1 to prevent the hydraulic cylinder from retracting.

[0042] The side of the first shovel 6 that is in contact with the first slider 1 is set as an inclined structure, so that when the shovel is in contact with the first slider 1, it can cut in through the inclined structure and thus brake the first slider 1.

[0043] It should be mentioned that the first hydraulic cylinder 4 and the second hydraulic cylinder 8 need to be fixed, and thus the first hydraulic cylinder 4 and the second hydraulic cylinder 8 are fixed in the mold frame 13 by the first hydraulic cylinder bracket 3 and the second hydraulic cylinder bracket 12 respectively; the two side walls of the first slider 1 are provided with first pressure strips 2; in this embodiment, the first pressure strips 2 are installed on both sides of the first slider 1 and cooperate with the hanging platforms on the left and right sides of the bottom of the first slider 1 to limit and guide the first slider 1. When the first slider 1 opens and closes, it plays a limiting and guiding role.

[0044] The main principle is as follows: the chicken shovel brake block 10 is connected to the T-groove of the first chicken shovel 6 in a T-shape. The second oil cylinder 8 drives the chicken shovel brake block 10 to move back and forth through the second oil cylinder connecting rod 9, thereby driving the first chicken shovel 6 to move up and down to stop and remove the first slider 1. Example

[0045] A hydraulic cylinder anti-reverse structure is provided, mainly suitable for the second slider 14 with a small projected area, such as... Figure 5 As shown, the structure includes a mold frame 13, a second slider 14, a third hydraulic cylinder 15 for driving the second slider 14 to reciprocate along the demolding direction, a second shovel 16 disposed above the tail of the second slider 14 to restrict the second slider 14 from retracting, and a shoulder screw 17 for guiding the second shovel 16 to move along its axial direction; the shoulder screw 17 is fixedly connected to the mold frame 13; the third hydraulic cylinder 15 is connected to the second slider 14 through a third hydraulic cylinder connecting rod 18, and the tail of the second slider 14 is provided with a sliding groove 19, and the third hydraulic cylinder connecting rod 18 has a reserved stroke space in the sliding groove 19.

[0046] like Figure 9 As shown, a spring 20 is sleeved on the side wall of the shoulder screw 17, and the spring 20 is a compression spring 20 and is located between the second shovel chicken 16 and the mold. A third guide block 21 is sleeved on the side wall of the second shovel chicken 16. When the mold frame 13 closes, the spring 20 is squeezed, and then the second shovel chicken 16 is pushed along the shoulder screw 17 through the third guide block 21 to stop the second slider 14.

[0047] It should be mentioned that the third hydraulic cylinder 15 is installed in the mold frame 13 via the third hydraulic cylinder bracket 26. The third hydraulic cylinder 15 is connected to the second slider 14 via the third hydraulic cylinder connecting rod 18, and the third hydraulic cylinder connecting rod 18 has a reserved stroke space in the slide groove 19 at the tail of the second slider 14. Within the stroke space, when the third hydraulic cylinder 15 is working, the third hydraulic cylinder connecting rod 18 first slides in the slide groove 19 at the tail of the second slider 14, and then, through the inclined surface feature of the third hydraulic cylinder connecting rod 18, it fits against the inclined surface feature of the second shovel 16, thereby driving the second shovel 16 vertically upward, thus releasing the stop on the second slider 14. Then, the stroke space reaches the end, at which point the third hydraulic cylinder 15 continues to work, driving the second slider 14 to move. In this embodiment, the forming space is set to 10cm.

[0048] It should be mentioned that the two side walls of the second slider 14 are provided with second pressure strips 22 facing each other; the two opposite side walls of the second slider 14 are respectively provided with slots 23, the slots 23 are connected to the slide groove 19, and a brake pin 24 is slidably connected in the slots 23.

[0049] The side wall of the second pressure strip 22 is provided with a V-shaped notch 25 that engages with the brake pin 24. The second pressure strip 22 is movably engaged with the brake pin 24 through the V-shaped notch 25.

[0050] Two brake pins 24 are provided and penetrate the side wall of the second slider 14. The side wall of the second pressure strip 22 is provided with a V-shaped notch 25 that engages with the brake pins 24. Both ends of the brake pins 24 are provided with a structure that engages with the V-shaped notch 25. When the third cylinder connecting rod 18 moves in the slide groove 19 and pushes the second slider 14, the third cylinder connecting rod 18 will push the brake pins 24, so that the two brake pins 24 will slide in the slot 23 and engage with the V-shaped notch 25 of the second pressure strip 22. The third cylinder connecting rod 18 will press against the brake pins 24, thereby fixing the two brake pins 24 and achieving braking. When the third cylinder connecting rod 18 retracts, the brake pins 24 are released from the fixation of the third cylinder connecting rod 18. After releasing the stop on the second shovel 16 in the formed space, when the second slider 14 moves, the brake pins 24 can slide in the slot 23 through the V-shaped notch 25, thereby achieving retraction.

[0051] The main working principle is as follows: When the mold frame 13 is closed, the spring 20 drives the second shovel 16 to move downward along the shoulder screw 17 to stop the second slider 14; when the mold frame 13 is opened, the third oil cylinder 15 drives the second slider 14 to move back and forth through the third oil cylinder connecting rod 18. The third oil cylinder connecting rod 18 has a certain stroke space in the corresponding second slider 14 tail mounting groove, which is 10cm as shown in the figure. During the initial stroke stage when the mold is opened, the third oil cylinder connecting rod 18 will use the inclined surface feature of the upper surface to drive the second shovel 16 upward to release the stop on the second slider 14 and continue to move to complete the demolding of the second slider 14. Example

[0052] Based on Embodiments 1 and 2, a mold is provided, including a mold assembly and a front mold slider disposed in the mold assembly. At least two front mold sliders are provided, each equipped with an independent hydraulic cylinder anti-retraction structure. In this embodiment, the two front mold sliders are arranged opposite to each other. Optional combinations include the hydraulic cylinder anti-retraction structure in Embodiment 1 and the hydraulic cylinder anti-retraction structure in Embodiment 2, thereby forming a mold that can accommodate both the first slider 1 with a larger projected area and the second slider 14 with a smaller projected area. Optional solutions also include both hydraulic cylinder anti-retraction structures being configured as those in Embodiment 1, i.e., suitable for the first slider 1 with a larger projected area; and both hydraulic cylinder anti-retraction structures being configured as those in Embodiment 2, i.e., suitable for the second slider 14 with a smaller projected area.

[0053] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A hydraulic cylinder anti-reverse structure, comprising a mold frame (13), characterized in that, Also includes: A first slider (1), a first oil cylinder (4) for driving the first slider (1) to reciprocate along the demolding direction, a first shovel (6) set on the moving path of the first slider (1) for limiting the retraction of the first slider (1), a shovel brake block (10) slidably connected to the first shovel (6), and a second oil cylinder (8) for driving the shovel brake block (10) to reciprocate along the horizontal direction. The first hydraulic cylinder (4) is connected to the first slider (1) via the first hydraulic cylinder connecting rod (5); the second hydraulic cylinder (8) is connected to the chicken shovel brake block (10) via the second hydraulic cylinder connecting rod (9); The first shovel chicken (6) has a first guide block (7) fitted on its side wall, and the first shovel chicken (6) achieves vertical reciprocating motion under the limitation of the first guide block (7).

2. The anti-reverse structure for hydraulic cylinders according to claim 1, characterized in that, The chicken shovel brake block (10) is connected to the first chicken shovel (6) in a T-shape, and the side of the chicken shovel brake block (10) that is in contact with the first chicken shovel (6) is set as an inclined surface.

3. The anti-reverse structure for hydraulic cylinders according to claim 1, characterized in that, One end of the first guide block (7) is fitted with a second guide block (11), and the second guide block (11) is fixedly connected to the mold frame (13).

4. The anti-reverse structure for hydraulic cylinders according to claim 1, characterized in that, The first oil cylinder (4) and the second oil cylinder (8) are respectively fixed in the first oil cylinder bracket (3) and the second oil cylinder bracket (12); the first oil cylinder bracket (3) and the second oil cylinder bracket (12) are both installed in the mold frame (13).

5. The anti-reverse structure for hydraulic cylinders according to claim 1, characterized in that, The first slider (1) has two opposing pressure strips (2) on its two side walls.

6. A hydraulic cylinder anti-reverse structure, comprising a mold frame (13), characterized in that, Also includes: The second slider (14), the third oil cylinder (15) for driving the second slider (14) to reciprocate along the demolding direction, the second shovel (16) disposed above the tail of the second slider (14) for limiting the second slider (14) to retract, and the shoulder screw (17) for guiding the second shovel (16) to move along its axial direction. Among them, the shoulder screw (17) is fixedly connected to the mold frame (13); the third oil cylinder (15) and the second slider (14) are connected by the third oil cylinder connecting rod (18), and the tail of the second slider (14) is provided with a sliding groove (19), and the third oil cylinder connecting rod (18) has a reserved stroke space in the sliding groove (19); The side wall of the shoulder screw (17) is fitted with a spring (20) for pushing the second shovel chicken (16) to the stop position when the mold is closed; The second shovel chicken (16) is fitted with a third guide block (21) on its side wall. The guide block is used to guide the direction of the second shovel chicken (16) during its movement.

7. The anti-reverse structure for hydraulic cylinders according to claim 6, characterized in that, The spring (20) is a compression spring (20) and is located between the second shovel chicken (16) and the mold.

8. The anti-reverse structure for hydraulic cylinders according to claim 6, characterized in that, The two side walls of the second slider (14) are provided with second pressure strips (22) facing each other; The two opposing sidewalls of the second slider (14) are respectively provided with slots (23), the slots (23) are connected to the slide groove (19), and a brake pin (24) is slidably connected in the slot (23). The side wall of the second pressure strip (22) is provided with a V-shaped notch (25) that engages with the brake pin (24). The second pressure strip (22) engages with the brake pin (24) through the V-shaped notch (25).

9. The anti-reverse structure for hydraulic cylinders according to claim 6, characterized in that, The third cylinder (15) is fixed in the third cylinder bracket (26), and the third cylinder bracket (26) is installed in the mold frame (13).

10. A mold, characterized in that, The device includes a mold assembly and a front mold slider disposed in the mold assembly, wherein there are at least two front mold sliders, each front mold slider being equipped with an independent hydraulic cylinder anti-recoil structure; the hydraulic cylinder anti-recoil structure includes the hydraulic cylinder anti-recoil structure as described in any one of claims 1 to 5, and / or the hydraulic cylinder anti-recoil structure as described in any one of claims 6 to 9.

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