A mold closing mechanism with a composite ejector cylinder

Abstract

This utility model discloses a mold closing mechanism with a composite ejector cylinder, including a moving mold plate, which has a mold plate body and an outwardly extending protruding structure. The protruding structure is equipped with at least one main ejector cylinder and at least two auxiliary ejector cylinders, the stroke of the main ejector cylinder being greater than the stroke of the auxiliary ejector cylinders. An ejector guide plate is provided between the mold plate body and the protruding structure. The piston rod of the main ejector cylinder is connected to the ejector guide plate, while the piston rod of the auxiliary ejector cylinders is not connected to the ejector guide plate. Several ejector rods are provided on the ejector guide plate, penetrating the mold plate body. During the stroke of the auxiliary ejector cylinders, the main ejector cylinder and the auxiliary ejector cylinders together drive the ejector guide plate to complete the ejection action of the ejector rods. During the remaining stroke, the main ejector cylinder alone drives the ejector guide plate to complete the ejection action of the ejector rods. This mold closing mechanism with a composite ejector cylinder can provide a large ejector force in the initial demolding stage and achieve rapid ejection in subsequent strokes, combining large ejection force and high movement speed to improve production efficiency.

Description

Technical Field

[0001] This utility model relates to the field of injection molding machine technology, specifically a mold closing mechanism with a composite ejector cylinder. Background Technology

[0002] Injection molding machines are widely used to produce various plastic products. Ejector cylinders are an important component of the mold closing mechanism of injection molding machines. After the product cools and solidifies and the mold is opened, the ejector action is required to eject the product from the mold. Some products require a large ejector force or a long ejector stroke to eject, but a large ejector force is not required for the entire stroke. It is usually required for a very short demolding distance.

[0003] Current injection molding machines typically use one or two parallel ejector cylinders. While increasing the diameter of the ejector cylinder sufficiently can meet the requirements of high ejector force, this increases its cross-sectional area, resulting in slower ejector movement and response, longer action time, and reduced production efficiency. Furthermore, increasing the size of the ejector cylinder may require shortening its length to avoid interference with the hinge part of the injection molding machine's clamping mechanism, thus reducing the ejector stroke.

[0004] Therefore, the aforementioned technical problems need to be solved. Summary of the Invention

[0005] This utility model addresses the above-mentioned technical problems by providing a mold closing mechanism with a composite ejector cylinder, which can provide a large ejector force in the early stage of demolding and achieve rapid ejection in the subsequent stroke, combining large ejection force and high movement speed to improve production efficiency.

[0006] To achieve the above objectives, the technical solution of this utility model is as follows:

[0007] A mold closing mechanism with a composite ejector cylinder includes a movable template, the movable template having a template body and an outwardly extending protrusion structure; the protrusion structure is provided with at least one main ejector cylinder and at least two auxiliary ejector cylinders, the stroke of the main ejector cylinder being greater than the stroke of the auxiliary ejector cylinders;

[0008] A guide plate is provided between the template body and the protruding structure. The piston rod of the main ejector cylinder is connected to the guide plate, while the piston rod of the auxiliary ejector cylinder is not connected to the guide plate.

[0009] The ejector guide plate is provided with a plurality of ejector rods that pass through the template body; within the stroke of the auxiliary ejector cylinder, the main ejector cylinder and the auxiliary ejector cylinder together drive the ejector guide plate to complete the ejection action of the ejector rod; beyond the stroke of the auxiliary ejector cylinder, the main ejector cylinder alone drives the ejector guide plate to complete the ejection action of the ejector rod.

[0010] This mold-closing mechanism with a composite ejector cylinder uses a combination of main and auxiliary ejector cylinders. During the short stroke at the beginning of product demolding, the main and auxiliary ejector cylinders work together to provide maximum and sufficient ejector force. For the remaining stroke, only the main ejector cylinder needs to quickly eject the product. The main ejector cylinder has a smaller diameter, resulting in rapid response and high speed, effectively shortening ejection time and improving production efficiency. Furthermore, the smaller diameter and overall size of the main ejector cylinder allow for a longer ejector stroke, avoiding interference between the cylinder and the machine hinge.

[0011] In a further optimized design, several of the ejector rods correspond one-to-one with the main ejector cylinder and the auxiliary ejector cylinder, and are coaxially arranged. This coaxial arrangement ensures stable force distribution on the ejector rods without deviation.

[0012] In a further optimized design, the auxiliary ejector cylinders are symmetrically arranged on both sides of the centerline of the moving template. This symmetrical arrangement ensures force balance during the ejection process and improves stability.

[0013] In a further optimized design, several guide rods are provided between the template body and the protruding structure, allowing the ejector plate to move back and forth. These guide rods guide the ejector plate during its reciprocating movement, ensuring stable and smooth movement.

[0014] Further optimization resulted in the secondary ejector cylinder having a stroke of less than 50mm. A short-stroke secondary ejector cylinder of less than 50mm is sufficient to meet the initial demolding requirements, has a compact structure, will not interfere with the machine hinge, and provides ample installation space.

[0015] In a further optimized design, the protruding structure is provided with a through hole through which the main cylinder piston rod and the auxiliary cylinder piston rod pass.

[0016] The mold closing mechanism with a composite ejector cylinder of this utility model has the following technical advantages compared with the prior art:

[0017] 1. In the initial stage of demolding, the main and auxiliary ejector cylinders work together to provide a large ejector force; in the subsequent stroke, only the main ejector cylinder works to achieve rapid ejection and shorten the ejector time.

[0018] 2. The main ejector cylinder has a small diameter, low inertia, and fast response speed, making it suitable for high-speed motion; at the same time, its small size allows it to provide a sufficiently long ejector stroke without interfering with the mechanism.

[0019] 3. The auxiliary ejector cylinder has a short stroke, compact structure, and sufficient installation space; in the case of initial demolding with the auxiliary main ejector cylinder, a main ejector cylinder with a smaller diameter and shape can be selected.

[0020] 4. Symmetrical arrangement of auxiliary oil cylinders ensures force balance during the ejection process and improves stability. Attached Figure Description

[0021] Figure 1 This is a perspective view of the first embodiment of the mold closing mechanism with a composite ejector cylinder of the present invention;

[0022] Figure 2 yes Figure 1 The main view;

[0023] Figure 3 yes Figure 2 AA section view;

[0024] Figure 4 This is a perspective view of the second embodiment of the mold closing mechanism with a composite ejector cylinder of the present invention.

[0025] In the diagram: 1. Moving template; 11. Protruding structure; 12. Through hole; 13. Center line; 14. Template body; 2. Ejector guide plate; 3. Guide rod; 4. Ejector rod; 5. Mechanical hinge; 6. Main ejector cylinder; 61. Main cylinder piston rod; 7. Auxiliary ejector cylinder; 71. Detailed Implementation

[0026] The present invention will now be described in further detail with reference to the embodiments shown in the accompanying drawings.

[0027] like Figures 1 to 3 As shown, this utility model has a first embodiment of a mold closing mechanism with a composite ejector cylinder; Figure 4 The image shows a second embodiment of the mold closing mechanism of this utility model with a composite ejector cylinder.

[0028] like Figures 1 to 3 As shown, the mold closing mechanism with a composite ejector cylinder in the first embodiment includes a movable template 1. The movable template 1 has a template body 14 and an outwardly extending protruding structure 11. The protruding structure 11 is provided with a main ejector cylinder 6 and two auxiliary ejector cylinders 7. The stroke of the main ejector cylinder 6 is greater than the stroke of the auxiliary ejector cylinders 7.

[0029] like Figure 3 As shown, a ejector guide plate 2 is provided between the template body 14 and the protruding structure 11. The main ejector cylinder 6 has a main cylinder piston rod 61, and the auxiliary ejector cylinder 7 has an auxiliary cylinder piston rod 71. The main cylinder piston rod 61 is connected to the ejector guide plate 2, while the auxiliary cylinder piston rod 71 is not connected to the ejector guide plate 2.

[0030] like Figure 3 As shown, the ejector guide plate 2 is provided with several ejector rods 4 that pass through the template body 14; within the stroke of the auxiliary ejector cylinder 7, the main ejector cylinder 6 and the auxiliary ejector cylinder 7 together drive the ejector guide plate 2 to complete the ejection action of the ejector rods 4; beyond the stroke of the auxiliary ejector cylinder 7, the main ejector cylinder 6 alone drives the ejector guide plate 2 to complete the ejection action of the ejector rods 4.

[0031] This mold clamping mechanism with a composite ejector cylinder uses a combination of main and auxiliary ejector cylinders. During the short stroke at the beginning of product demolding, the main and auxiliary ejector cylinders work together to provide maximum and sufficient ejector force. During the remaining stroke, only the main ejector cylinder 6 needs to quickly eject the product. The main ejector cylinder 6 has a small diameter, characterized by rapid response and high speed, effectively shortening ejection time and improving production efficiency. Furthermore, the small diameter and overall size of the main ejector cylinder 6 allow for a longer ejector stroke, avoiding contact between the cylinder and the machine hinge 5 (…). Figure 2 The dashed line shown represents the interference of the mechanical hinge 5 (outer shape).

[0032] like Figure 3 As shown, several ejector rods 4 correspond one-to-one with the main ejector cylinder 6 and the auxiliary ejector cylinder 7, and are coaxially arranged, meaning there are 3 ejector rods 4 in total. The coaxial arrangement ensures that the force on the ejector rods 4 is stable and does not shift.

[0033] like Figure 3 As shown, the auxiliary ejector cylinders 7 are symmetrically arranged on both sides of the center line 13 of the moving template 1. The symmetrical arrangement of the auxiliary ejector cylinders 7 ensures the balance of forces during the ejection process and improves stability.

[0034] like Figure 1 and Figure 2 As shown, a number of guide rods 3 are provided between the template body 14 and the protruding structure 11, which move back and forth between the ejector guide plate 2 and the template body 14. The guide rods 3 play a guiding role during the back and forth movement of the ejector guide plate 2, ensuring the stability of the movement process without jamming.

[0035] like Figure 2 As shown, the stroke of the secondary ejector cylinder 7 is less than 50mm. The short stroke of the secondary ejector cylinder 7 (less than 50mm) can meet the initial demolding requirements. It has a compact structure, will not interfere with the machine hinge 5, and has sufficient installation space.

[0036] like Figure 3 As shown, the protruding structure 11 is provided with through holes 12 through which the main cylinder piston rod 61 and the auxiliary cylinder piston rod 71 pass. The number of through holes 12 is the same as the total number of the main ejector cylinder 6 and the auxiliary ejector cylinder 7, which is 3.

[0037] During operation, the main and auxiliary ejector cylinders 7 retract to the end, and the auxiliary cylinder piston rod 71 contacts the ejector guide plate 2. At this time, the ejector rod 4 does not extend beyond the moving platen 1. When the ejector cylinder starts to advance, the main cylinder piston rod 61 and the auxiliary cylinder piston rod 71 act on the ejector guide plate 2 at the same time, exerting maximum force together and transmitting it to the ejector guide plate 2 and the ejector rod 4. The ejector rod 4 extends out of the moving platen 1 to act on the external mold and transmit force to the plastic product.

[0038] When the forward distance of the ejector guide plate 2 is greater than the stroke of the auxiliary ejector cylinder 7, the auxiliary cylinder piston rod 71 separates from the ejector guide plate 2; the ejector guide plate 2 is only rapidly advanced by the action of the main ejector cylinder 6, and when it advances to a certain position, the ejector rod 4 allows the plastic product to be completely separated from the mold; when the ejector guide plate 2 retracts, it also retracts rapidly only under the action of the main ejector cylinder 6; the main ejector cylinder 6 has a small diameter, low motion inertia, and a fast starting speed.

[0039] like Figure 4 As shown, the mold closing mechanism with composite ejector cylinders in the second embodiment differs from that in the first embodiment in that the number of main ejector cylinders 6 is two, arranged at the top and bottom, while the other structures are the same.

[0040] The first embodiment of the mold closing mechanism with a composite ejector cylinder includes a main ejector cylinder 6 and two auxiliary ejector cylinders 7. This combination is generally applicable to mold closing mechanisms with a capacity of less than 700 tons.

[0041] The mold closing mechanism with composite ejector cylinders in the second embodiment includes two main ejector cylinders 6 and two auxiliary ejector cylinders 7. This combination is generally applicable to mold closing mechanisms of 700 tons or more or all electric mold closing mechanisms.

[0042] This mold closing mechanism with a composite ejector cylinder can provide a large ejector force in the early stage of demolding and achieve rapid ejection in the subsequent stroke, combining large ejection force and high movement speed to improve production efficiency.

[0043] In summary, as described in the specification and figures, this utility model has been manufactured into actual samples and subjected to multiple use tests. The test results demonstrate that this utility model achieves its intended purpose, and its practicality is beyond doubt. The embodiments described above are merely for illustrative purposes and are not intended to limit the scope of this utility model. Any equivalent embodiments made by those with common knowledge in the relevant technical field, utilizing the technical content disclosed in this utility model, without departing from the scope of the technical features and similar features disclosed in this utility model, are all within the protection scope of this utility model.

Claims

1. A clamping mechanism with a composite ejector pin ram, comprising a movable die plate (1), characterized in that: The moving template (1) has a template body (14) and an outwardly extending protruding structure (11); the protruding structure (11) is provided with at least one main ejector cylinder (6) and at least two auxiliary ejector cylinders (7), and the stroke of the main ejector cylinder (6) is greater than the stroke of the auxiliary ejector cylinder (7). A pin guide plate (2) is provided between the template body (14) and the protruding structure (11). The piston rod of the main pin cylinder (6) is connected to the pin guide plate (2), while the piston rod of the auxiliary pin cylinder (7) is not connected to the pin guide plate (2). The ejector guide plate (2) is provided with several ejector rods (4) that pass through the template body (14); within the stroke of the auxiliary ejector cylinder (7), the main ejector cylinder (6) and the auxiliary ejector cylinder (7) drive the ejector guide plate (2) together to complete the ejection action of the ejector rod (4); beyond the stroke of the auxiliary ejector cylinder (7), the main ejector cylinder (6) drives the ejector guide plate (2) alone to complete the ejection action of the ejector rod (4).

2. The mold clamping mechanism having a compound pin ram according to claim 1, wherein Several of the ejector rods (4) correspond one-to-one with the main ejector cylinder (6) and the auxiliary ejector cylinder (7) and are coaxially arranged.

3. The mold closing mechanism with a composite ejector cylinder according to claim 1 or 2, characterized in that, The auxiliary ejector cylinder (7) is symmetrically arranged on both sides of the center line (13) of the moving template (1).

4. The mold closing mechanism with a composite ejector cylinder according to claim 1, characterized in that, A number of guide rods (3) are provided between the template body (14) and the protruding structure (11) for the pin guide plate (2) to move back and forth.

5. The mold closing mechanism with a composite ejector cylinder according to claim 1, characterized in that, The stroke of the auxiliary ejector cylinder (7) is less than 50 mm.

6. The mold closing mechanism with a composite ejector cylinder according to claim 1, characterized in that, The protruding structure (11) is provided with a through hole (12) through which the main cylinder piston rod and the auxiliary cylinder piston rod pass.

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