Oil cylinder anti-retreating structure and die

Abstract

The invention discloses an oil cylinder anti-receding structure and a mold in the technical field of injection molds, and the oil cylinder anti-receding structure comprises a mold frame, a first sliding block, a first oil cylinder used for driving the first sliding block to reciprocate in the demolding direction, a first shovel arranged on the moving path of the first sliding block and used for limiting receding of the first sliding block, and a shovel brake block slidably connected with the first shovel. 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] The present invention relates to an oil cylinder anti-retreat structure and a mold, belonging to the technical field of injection molds. Background Art

[0002] The front mold slider is a very common structure in the field of injection molds. It is designed on the front mold side according to the structural characteristics of the product. During injection production, before the injection molding machine opens the front and rear molds, the front mold slider must first disengage from the product undercut. Otherwise, the product will be scratched at least during mold opening, and even the product may not be demolded for normal production. This is because the power for mold opening directly comes from the moving mold side of the injection molding machine. When the mold is opened, the product needs to stay on the moving mold side, and then the ejector rod power on the moving mold side of the injection molding machine is used to push the ejector plate to eject the product from the cavity. This requires the front mold slider to completely disengage from the undercut on the product before mold opening. There are usually two structures in mold design to solve this problem: One is to design a three-plate mold structure to drive the front mold slider to ensure that the front mold slider disengages from the product undercut before mold opening. The mold base adopts three-plate secondary parting. Before the front and rear molds are opened, a primary mold opening parting is ensured between the female mold plate and the template behind the female mold plate to ensure that the front mold slider disengages from the product undercut and then the front and rear molds are opened by secondary mold opening parting. Its advantage is that the mechanical ejector can ensure that the slider can withstand the injection pressure without retreating. Its disadvantage is that it will not only increase the mold cost but also the production cycle, and even increase the machine tonnage cost due to the increased mold thickness caused by the three-plate structure.

[0003] The other is to design a two-plate mold structure, usually using an oil cylinder to drive the front mold slider to ensure that the front mold slider disengages from the product undercut before mold opening. The mold base adopts two-plate primary parting. Before the front and rear molds are opened and parted, an oil cylinder is used to drive to ensure that the front mold slider disengages from the product undercut. Compared with the three-plate structure, its advantages are simple mold structure, low cost, short production cycle, and no increase in machine tonnage cost due to mold thickness. Its disadvantage is that since an oil cylinder is used to drive and stop the slider, the oil cylinder will retreat due to high injection pressure during production, resulting in defects such as burrs and scratches on the product.

[0004] Compared with the three-plate structure, the two-plate structure has low cost and short cycle, especially the characteristic of not increasing the machine tonnage due to the mold height is very popular at the factory end. However, at the same time, the problem that the oil cylinder retreats under pressure, resulting in burrs and other defects on the product, also troubles the factory end, which requires increasing labor costs to trim the burrs twice.

[0005] Therefore, an oil cylinder anti-retreat structure and a mold are proposed. Summary of the Invention

[0006] The purpose of the present invention is to overcome the deficiencies in the prior art to solve the problem that in the two-plate mold structure, when the oil cylinder drives the slider under the action of high injection pressure, it is easy to retreat, resulting in burrs, scratches or inability to smoothly demold the product.

[0007] To solve the above technical problems, the present invention is implemented by the following technical solutions: In a first aspect, there is provided an oil cylinder anti-retreat structure, including a die set, a first slider, a first oil cylinder for driving the first slider to reciprocate in the demolding direction, a first lifter disposed on the moving path of the first slider for restricting the first slider from retreating, a lifter brake block slidably connected to the first lifter, and a second oil cylinder for driving the lifter brake block to reciprocate in the horizontal direction; The first oil cylinder and the first slider are connected by a first oil cylinder connecting rod; the second oil cylinder and the lifter brake block are connected by a second oil cylinder connecting rod; Wherein, a first guide block is sleeved on the side wall of the first lifter, and the first lifter realizes reciprocating motion in the vertical direction under the limit of the first guide block.

[0008] Further, the lifter brake block and the first lifter are T-shaped connected, and the surface of the lifter brake block in contact with the first lifter is set as an inclined surface.

[0009] Further, a second guide block is assembled at one end of the first guide block, and the second guide block is fixedly connected to the die set.

[0010] Further, the first oil cylinder and the second oil cylinder are respectively fixed in a first oil cylinder bracket and a second oil cylinder bracket, and both the first oil cylinder bracket and the second oil cylinder bracket are installed in the die set.

[0011] Further, first pressing strips are oppositely arranged on two side walls of the first slider.

[0012] In a second aspect, there is provided another oil cylinder anti-retreat structure, including a die set, a second slider, a third oil cylinder for driving the second slider to reciprocate in the demolding direction, a second lifter disposed above the tail of the second slider for restricting the second slider from retreating, and a shoulder screw for guiding the second lifter to move along its axial direction; Wherein, the shoulder screw is fixedly connected to the die set; the third oil cylinder and the second slider are connected by a third oil cylinder connecting rod, and a chute is provided at the tail of the second slider, and a stroke space is reserved for the third oil cylinder connecting rod in the chute; A spring is sleeved on the side wall of the shoulder screw for pushing the second lifter to the stop position when the mold is closed; A third guide block is sleeved on the side wall of the second lifter, and the guide block is used for guiding the direction of the second lifter during the movement process.

[0013] Further, the spring is a compression spring and is arranged between the second lifter and the mold.

[0014] Further, second pressing strips are oppositely arranged on two side walls of the second slider; The two opposite side walls of the second slider are respectively provided with slots, the slots are communicated with the sliding grooves, and a braking pin is slidably connected in the slots; The side wall of the second pressing strip is provided with a V-shaped notch that engages with the braking pin, and the second pressing strip is movably engaged with the braking pin through the V-shaped notch.

[0015] Further, the third oil cylinder is fixed in the third oil cylinder bracket, and the third oil cylinder bracket is installed in the mold base.

[0016] In a third aspect, a mold is provided, including a mold assembly and a front mold slider disposed in the mold assembly. There are at least two front mold sliders, and each front mold slider is equipped with an independent oil cylinder anti-retreat structure; the oil cylinder anti-retreat includes the oil cylinder anti-retreat structure described in the first aspect and / or the oil cylinder anti-retreat structure described in the second aspect.

[0017] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: By arranging a scraper that can limit the backward movement of the slider on the path of the oil cylinder driving the slider and combining the control of the scraper by the oil cylinder, the present invention can effectively solve the problems of the slider moving backward due to excessive injection pressure in traditional two-plate molds, thereby causing product flash, scratching or demolding failure; and the scraper has the advantages of clear limiting direction, reliable locking and rapid response, and can ensure its stable movement trajectory during operation in cooperation with the guide block, improving the repeatability and consistency of the anti-retreat action. Description of the Drawings

[0018] Figure 1 Shown is the front mold side plan view in the assembled state of the front mold slider group of the two-plate mold structure provided by the present invention; Figure 2 Shown is the rear mold side plan view in the assembled state of the front mold slider group of the two-plate mold structure provided by the present invention; Figure 3 Shown is the Y-axis cross-sectional view in the assembled state of the front mold slider group of the two-plate mold structure provided by the present invention; Figure 4 Shown is the partial enlargement in the assembled state of the front mold slider group of the two-plate mold structure provided by the present invention Figure 1 ; Figure 5 Shown is the partial enlargement in the assembled state of the front mold slider group of the two-plate mold structure provided by the present invention Figure 2 ; Figure 6 Shown is the front and rear mold side unequal angle view in the assembled state of the front mold slider group of the two-plate mold structure provided by the present invention; Figure 7 Shown is the unequal angle view of the front mold slider of the two-plate mold structure provided by the present invention; Figure 8The following is an exploded view of the front mold slider of the two-plate mold structure provided by the first embodiment of the present invention; Figure 9 The following is an exploded view of the front mold slider of the two-plate mold structure provided by the first embodiment of the present invention.

[0019] Reference numerals: 1. First slider; 2. First pressing strip; 3. First oil cylinder bracket; 4. First oil cylinder; 5. First oil cylinder connecting rod; 6. First lifter; 7. First guide block; 8. Second oil cylinder; 9. Second oil cylinder connecting rod; 10. Lifter brake block; 11. Second guide block; 12. Second oil cylinder bracket; 13. Mold base; 14. Second slider; 15. Third oil cylinder; 16. Second lifter; 17. Shoulder screw; 18. Third oil cylinder connecting rod; 19. Chute; 20. Spring; 21. Third guide block; 22. Second pressing strip; 23. Groove; 24. Brake pin; 25. V-shaped notch; 26. Third oil cylinder bracket. Detailed implementation manners

[0020] 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 solutions of the present invention and cannot be used to limit the protection scope of the present invention.

[0021] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations. Embodiment 1:

[0022] As Figure 1 、 Figure 2 and Figure 3 shown, an oil cylinder anti-retreat structure is provided, which is mainly applicable to the first slider 1 with a relatively large projected area. As Figure 4 and Figure 6 shown, the structure includes a mold base 13, a first slider 1, a first oil cylinder 4 for driving the first slider 1 to reciprocate in the demolding direction, a first lifter 6 arranged on the moving path of the first slider 1 to limit the backward movement of the first slider 1, a lifter brake block 10 slidably connected to the first lifter 6, and a second oil cylinder 8 for driving the lifter brake block 10 to reciprocate in the horizontal direction; the first oil cylinder 4 is connected to the first slider 1 through a first oil cylinder connecting rod 5; the second oil cylinder 8 is connected to the lifter brake block 10 through a second oil cylinder connecting rod 9; As Figure 7 and Figure 8As shown, when the second oil cylinder 8 is working, the shovel chicken brake block 10 is pushed by the second oil cylinder connecting rod 9, and the shovel chicken brake block 10 moves horizontally at this time. Since the side of the shovel chicken brake block 10 that is in contact with the first shovel chicken 6 is set to an inclined plane, the first shovel chicken 6 and the shovel chicken brake block 10 are connected in a T-shape through the inclined plane, so that the shovel chicken can move vertically; in combination with the side wall of the first shovel chicken 6, a first guide block 7 is provided, and one end of the first guide block 7 is equipped with a second guide block 11, and the second guide block 11 is fixedly connected to the mold frame 13, and the second guide block 11 is used to prevent the shovel chicken brake block 10 from being pulled out of the corresponding slot on the mold frame by the second oil cylinder 8 in the mold opening state; the first guide block 7 only reserves space for allowing the first shovel chicken 6 to move back and forth in the vertical direction. When the second oil cylinder 8 is working, the shovel chicken brake block 10 moves horizontally, and the shovel chicken can move vertically, thereby limiting the first slider 1 to prevent the oil cylinder from retreating.

[0023] Among them, the side of the first shovel chicken 6 that is in contact with the first sliding block 1 is set as an inclined structure, so that when the shovel chicken is in contact with the first sliding block 1, it can cut in through the inclined structure to brake the first sliding block 1.

[0024] One point that needs to be mentioned is that the first cylinder 4 and the second cylinder 8 need to be fixed, and then the first cylinder 4 and the second cylinder 8 are fixed in the mold frame 13 respectively through the first cylinder bracket 3 and the second cylinder bracket 12; the two side walls of the first slider 1 are provided with a first pressure strip 2; in this embodiment, the first pressure strip 2 is installed on both sides of the first slider 1, and cooperates with the hanging platforms on the left and right sides of the bottom of the first slider 1, and plays a limiting and guiding role for the first slider 1, and plays a limiting and guiding role when the first slider 1 opens and closes.

[0025] The main principle is: the shovel chicken brake block 10 is T-shapedly connected to the T-slot of the first shovel chicken 6, and the second cylinder 8 drives the shovel chicken brake block 10 to move back and forth through the second cylinder connecting rod 9, thereby driving the first shovel chicken 6 to move up and down to achieve stopping and unstopping of the first slider 1. Embodiment 2:

[0026] A cylinder anti-retraction structure is provided, which is mainly suitable for the second slider 14 with a smaller projection area, such as Figure 5As shown, the structure includes a mold base 13, a second slider 14, a third oil cylinder 15 for driving the second slider 14 to reciprocate in the demolding direction, a second ejector 16 arranged above the tail of the second slider 14 for restricting the backward movement of the second slider 14, and a shoulder screw 17 for guiding the second ejector 16 to move along its axial direction; the shoulder screw 17 is fixedly connected to the mold base 13; the third oil cylinder 15 is connected to the second slider 14 through a third oil cylinder connecting rod 18, and a chute 19 is arranged at the tail of the second slider 14, and the third oil cylinder connecting rod 18 reserves a stroke space in the chute 19.

[0027] As 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 arranged between the second ejector 16 and the mold. Combined with a third guide block 21 sleeved on the side wall of the second ejector 16, when the mold base 13 is closed, the spring 20 is compressed, and then the second ejector 16 is pushed along the shoulder screw 17 to pass through the third guide block 21 to realize the stopping of the second slider 14.

[0028] It should be mentioned that the third oil cylinder 15 is installed in the mold base 13 through a third oil cylinder bracket 26. The third oil cylinder 15 is connected to the second slider 14 through a third oil cylinder connecting rod 18, and the third oil cylinder connecting rod 18 reserves a stroke space in the chute 19 at the tail of the second slider 14. In the stroke space, when the third oil cylinder 15 works, the third oil cylinder connecting rod 18 first slides in the chute 19 at the tail of the second slider 14, and then through the inclined surface feature on the surface of the third oil cylinder connecting rod 18, it fits with the inclined surface feature on the surface of the second ejector 16, so as to drive the second ejector 16 to move vertically upward, thereby releasing the stopping of the second slider 14. Then, when the stroke space reaches the end, at this time, the third oil cylinder 15 continues to work and will drive the second slider 14 to move; in this embodiment, the formed space is set to 10 cm. It should be mentioned that second pressure strips 22 are arranged oppositely on the two side walls of the second slider 14; slot openings 23 are respectively arranged on the two opposite side walls of the second slider 14, the slot openings 23 are communicated with the chute 19, and a brake pin 24 is slidably connected in the slot openings 23. A V-shaped notch 25 for engaging with the brake pin 24 is arranged on the side wall of the second pressure strip 22, and the second pressure strip 22 is movably engaged with the brake pin 24 through the V-shaped notch 25.

[0029] The braking pins 24 are provided in two numbers and penetrate through the side wall of the second slider 14; a V-shaped notch 25 engaged with the braking pin 24 is provided on the side wall of the second pressing strip 22, and structures engaged with the V-shaped notch 25 are provided at both ends of the braking pin 24. Thus, when the third oil cylinder connecting rod 18 moves in the sliding groove 19 and pushes the second slider 14, the third oil cylinder connecting rod 18 will push the braking pin 24, so that the two braking pins 24 will slide in the slotted groove 23, and then engage with the V-shaped notch 25 of the second pressing strip 22, and the third oil cylinder connecting rod 18 presses against the braking pin 24, thereby fixing the two braking pins 24 to achieve braking; when the third oil cylinder connecting rod 18 retracts, the braking pin 24 is released from the fixation of the third oil cylinder connecting rod 18. After releasing the stop of the second shovel 16 in the formed space and driving the second slider 14 to move, the braking pin 24 can slide in the slotted groove 23 through the V-shaped notch 25, thereby achieving contraction.

[0030] The main working principle is as follows: when the mold base 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 base 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 tail mounting groove of the second slider 14, which is shown as 10 cm in the figure. In the initial stroke stage when opening the mold, the third oil cylinder connecting rod 18 will use the inclined surface feature on the upper surface to drive the second shovel 16 upward to release the stop of the second slider 14 and then continue to move to complete the demolding of the second slider 14. Embodiment 3:

[0031] Based on Embodiment 1 and Embodiment 2, a mold is provided, which includes a mold assembly and a front mold slider arranged in the mold assembly. The front mold slider is provided with at least two, and each front mold slider is equipped with an independent oil cylinder anti-retreat structure; and in this embodiment, the two front mold sliders are arranged oppositely, and the optional combination scheme is the oil cylinder anti-retreat structure in Embodiment 1 and the oil cylinder anti-retreat structure in Embodiment 2, so as to form a mold that can be applicable to both the first slider 1 with a larger projected area and the second slider 14 with a smaller projected area; at the same time, the optional scheme also includes that both oil cylinder anti-retreat structures are set as the oil cylinder anti-retreat structure in Embodiment 1, that is, applicable to the first slider 1 with a larger projected area; and both oil cylinder anti-retreat structures are set as the oil cylinder anti-retreat structure in Embodiment 2, that is, applicable to the second slider 14 with a smaller projected area.

[0032] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and deformations can be made, and these improvements and deformations should also be regarded as the protection scope of the present invention.

Claims

1. An anti-retreat structure for an oil cylinder, comprising a die carrier (13), characterized in that, Further included are: a first slider (1), a first oil cylinder (4) for driving the first slider (1) to reciprocate in the demolding direction, a first ejector (6) arranged on the moving path of the first slider (1) for restricting the backward movement of the first slider (1), a ejector brake block (10) slidably connected to the first ejector (6), and a second oil cylinder (8) for driving the ejector brake block (10) to reciprocate in the horizontal direction; the first oil cylinder (4) is connected to the first slider (1) through a first oil cylinder connecting rod (5); the second oil cylinder (8) is connected to the ejector brake block (10) through a second oil cylinder connecting rod (9); wherein, a first guide block (7) is sleeved on the side wall of the first ejector (6), and the first ejector (6) realizes reciprocating movement in the vertical direction under the limitation of the first guide block (7).

2. The oil cylinder anti-retreat structure according to claim 1, wherein, The ejector brake block (10) is T-shaped connected with the first ejector (6), and the surface of the ejector brake block (10) attached to the first ejector (6) is set as an inclined surface.

3. The oil cylinder anti-retreat structure according to claim 1, characterized in that, One end of the first guide block (7) is equipped with a second guide block (11), and the second guide block (11) is fixedly connected to the mold base (13).

4. The anti-retreat structure of the oil cylinder according to claim 1, characterized in that, The first oil cylinder (4) and the second oil cylinder (8) are respectively fixed in a first oil cylinder bracket (3) and a second oil cylinder bracket (12); both the first oil cylinder bracket (3) and the second oil cylinder bracket (12) are installed in the mold base (13).

5. The oil cylinder anti-retreat structure according to claim 1, characterized in that First pressing strips (2) are oppositely arranged on two side walls of the first slider (1).

6. An anti-retreat structure for an oil cylinder, comprising a die carrier (13), characterized in that, Further included are: a second slider (14), a third oil cylinder (15) for driving the second slider (14) to reciprocate in the demolding direction, a second ejector (16) arranged above the tail of the second slider (14) for restricting the backward movement of the second slider (14), and a shoulder screw (17) for guiding the second ejector (16) to move along its axis; wherein, the shoulder screw (17) is fixedly connected to the mold base (13); the third oil cylinder (15) is connected to the second slider (14) through a third oil cylinder connecting rod (18), and a chute (19) is arranged at the tail of the second slider (14), and the third oil cylinder connecting rod (18) has a stroke space reserved in the chute (19); a spring (20) is sleeved on the side wall of the shoulder screw (17) for pushing the second ejector (16) to the stop position during mold closing; a third guide block (21) is sleeved on the side wall of the second ejector (16), and the guide block is used for guiding the direction of the second ejector (16) during movement.

7. The oil cylinder anti-retreat structure according to claim 6, characterized in that, The spring (20) is a compression spring (20) and is arranged between the second ejector (16) and the mold.

8. The oil cylinder anti-retreat structure according to claim 6, characterized in that, Second pressing strips (22) are oppositely arranged on two side walls of the second slider (14); Open slots (23) are respectively arranged on two opposite side walls of the second slider (14), the open slots (23) are communicated with the chute (19), and a brake pin (24) is slidably connected in the open slots (23); A V-shaped notch (25) for engaging with the brake pin (24) is arranged on the side wall of the second pressing strip (22), and the second pressing strip (22) is movably engaged with the brake pin (24) through the V-shaped notch (25).

9. The oil cylinder anti-retreat structure according to claim 6, wherein The third oil cylinder (15) is fixed in the third oil cylinder bracket (26), and the third oil cylinder bracket (26) is installed in the mold base (13).

10. A mold, characterized in that, It includes a mold assembly and a front mold slider arranged in the mold assembly. There are at least two front mold sliders, and each front mold slider is equipped with an independent oil cylinder anti-retreat structure; the oil cylinder anti-retreat includes the oil cylinder anti-retreat structure according to any one of claims 1 to 5, and / or the oil cylinder anti-retreat structure according to any one of claims 6 to 9.

Images