A mold closing anti-collision mechanism for a rubber sealing surface in a mold

Abstract

The application discloses a mold closing anti-collision mechanism for a glue sealing surface in a mold, which comprises a core-pulling slide block and a straight ejection assembly, wherein the straight ejection assembly comprises an ejector rod and an ejector block fixed to the top end of the ejector rod, and the lower end of the ejector rod penetrates through a back mold downward and is fixedly installed on a ejector plate. The front end bottom sharp corner edge of the core-pulling slide block and the top end surface of the ejector block form a glue sealing surface in a mold closing state. The top end surface of the ejector block is sequentially provided with an inclined lower glue sealing surface, a buffer pressing surface and a large C-angle inclined surface from the side close to product forming. Correspondingly, the front end bottom surface of the core-pulling slide block is sequentially provided with an upper glue sealing surface and a contact surface. During a mold closing action process, the front end bottom sharp corner edge of the core-pulling slide block is always not in contact with the ejector block. The application is simple in structure and ingeniously utilizes three inclined surfaces arranged on the straight ejection block, effectively avoids the mold collision problem between the front end bottom sharp corner edge of the core-pulling slide block and the straight ejection, guarantees the integrity of the glue sealing surface and improves product forming quality.

Description

Technical Field

[0001] The invention relates to the technical field of injection molds, and in particular to a mold closing anti-collision mechanism for a sealing surface in a mold. Background Art

[0002] An injection mold is a tool used to produce plastic products and give them their complete structure and precise dimensions. During use, the heated, molten plastic is injected into the mold cavity under high pressure by the injection molding machine. After cooling and solidification, the molded product is obtained. When the product is ejected after injection molding, the corresponding slider in the mold structure first withdraws, and then the vertical push rod pushes the product upward. Before closing the mold, the vertical push rod retracts, and the slider resets. This process is prone to problems, such as the vertical push rod not fully returning to its original position, or failing to return to its original position, with a reset error of no more than 1mm, resulting in a certain protrusion height. In traditional mold designs, the sealing surface of the vertical push rod is a flat, inclined surface with right-angled edges. If the slider is forced to reset under its power, it is prone to mold collision. Alternatively, the slider and the vertical push rod are forced to reset, causing damage to the sealing surface between the slider and the vertical push rod. This can lead to spillage of the material at the sealing surface during injection molding, affecting the molding quality of the entire product. Furthermore, maintenance costs are high, replacement is inconvenient, and mold damage can occur, affecting injection molding efficiency. Summary of the Invention

[0003] The purpose of the present invention is to solve the deficiencies in the above-mentioned prior art and to provide a mold closing anti-collision mechanism for the sealing surface inside a mold.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: a mold closing anti-collision mechanism for the sealing surface of the mold, comprising a core pulling slider and a straight ejector assembly, wherein the straight ejector assembly comprises an ejector block and an ejector rod, the ejector block is fixedly mounted on the top end of the ejector rod, the lower end of the ejector rod passes downward through the rear mold and the ejector plate in sequence, and is fixedly mounted on the bottom surface of the ejector panel in the ejector plate; the sharp corner edge of the front end bottom of the core pulling slider contacts the top surface of the ejector block in the mold closing state to form a sealing surface; the top surface of the ejector block is provided with multiple sections of interconnected inclined surfaces, which are a lower sealing surface, a buffer pressing surface and a large C-angle inclined surface in sequence from the product molding side to the core pulling slider side, and correspondingly, the front end bottom surface of the core pulling slider is provided with an upper sealing surface and a contact surface in sequence; during the mold closing action, the sharp corner edge of the front end bottom of the core pulling slider is always not in contact with the ejector block.

[0005] Furthermore, the inclination angle of the buffer pressing surface in the top surface of the ejection block is smaller than the setting angle of the lower sealing surface, the inclination angle of the large C-angle inclined surface is larger than the setting angle of the lower sealing surface; the setting length of the buffer pressing surface is smaller than the setting length of the lower sealing surface.

[0006] Furthermore, the upper sealing surface of the front end bottom surface of the core-pulling slider is parallel to the lower sealing surface of the ejector block, the inclination angle of the contact surface is smaller than the inclination angle of the upper sealing surface, and is parallel to the buffer pressing surface of the ejector block.

[0007] Furthermore, during the mold closing operation, when the above-mentioned straight ejection assembly is reset to the bottom, the above-mentioned core-pulling slider slides directly to the sealing surface position under the action of its driving force, and the sharp corner edge of the front end bottom of the core-pulling slider is tightly fitted with the middle and lower sealing surface of the top end surface of the ejection block.

[0008] Furthermore, during the mold closing operation, when the above-mentioned straight ejector assembly has not yet been reset to the bottom, the contact surface on the core-pulling slider first contacts and slides with the top corner of the large C-angle inclined surface on the ejection block, pressing the straight ejector assembly downward, and then the corner between the contact surface and the upper sealing surface slides and contacts with the buffer pressing surface on the ejection block, pressing the straight ejector assembly downward again until the sharp corner edge of the front end bottom of the above-mentioned core-pulling slider is tightly fitted with the middle and lower sealing surface of the top surface of the ejection block.

[0009] Furthermore, a guide block is fixedly installed on the bottom surface of the rear mold by countersunk bolts, and the ejector rod is slidably inserted into the through hole of the guide block.

[0010] Furthermore, the rear end side of the core-pulling slider is connected to the end of the piston rod of the driving cylinder, and the driving cylinder is fixedly installed on the rear mold.

[0011] Compared with the prior art, the present invention has the following beneficial effects: the present invention has a simple structure and utilizes the design and coordination of the three inclined surfaces on the straight top ejection block to effectively avoid the collision between the sharp corner edge of the front end bottom of the core-pulling slider and the straight top, thereby preventing damage to the sealing surface, ensuring the integrity of the sharp corner sealing surface of the core-pulling slider, improving product molding quality, reducing maintenance costs, and improving work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0013] Figure 2 A longitudinal cross-sectional view of the present invention at the center of the ejector rod;

[0014] Figure 3 for Figure 2 A magnified view of the structure of part A;

[0015] Figure 4 It is a structural schematic diagram of the straight top assembly in the present invention;

[0016] Figure 5 for Figure 4 A magnified view of the structure of part B;

[0017] Figure 6 A side view of the ejector block of the present invention;

[0018] Figure 7 This is a bottom side view of the front end of the core-pulling slider in the present invention;

[0019] Figure 8 This is a schematic diagram of the matching action before mold closing of the present invention;

[0020] In the figure: 1. rear mold, 2. ejector plate, 3. bottom plate, 4. core-pulling slider, 5. straight ejector assembly, 6. product, 7. sealing surface, 41. sharp edge of the bottom front end, 42. upper sealing surface, 43. contact surface, 51. ejector block, 52. ejector rod, 53. guide block, 511. lower sealing surface, 512. buffer pressing surface, 513. large C-angle inclined surface. DETAILED DESCRIPTION

[0021] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "front", "back", "top", "bottom", "center", "one side", "the other side" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are merely relational words determined for the convenience of describing the structural relationships of the various components in the present invention, and do not specifically mean that any component in the present invention must have a specific orientation, be constructed and operated in a specific orientation, and should not be understood as a limitation on the present invention.

[0022] In the present invention, the terms "first" and "second" are used for descriptive purposes only and do not specifically refer to an order or sequence. They are simply used to distinguish components or operations described with the same technical terms. It should also be noted that, unless otherwise clearly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can be directly connected or indirectly connected through an intermediate medium. 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 circumstances.

[0023] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings:

[0024] like Figures 1 to 7As shown, a mold closing and anti-collision mechanism for the sealing surface in the mold is mainly arranged on the rear mold side, including a core-pulling slider 4 and a straight ejector assembly 5, wherein the core-pulling slider 4 is slidably installed on the rear mold 1, and its rear end is connected to the end of the piston rod of the driving cylinder, and the driving cylinder is fixedly installed on the rear mold 1. In the mold closing state, the core-pulling slider 4 can fit tightly with the top of the straight ejector assembly 5 to form a part of the product molding cavity, and the sealing surface 7 is between the two. The straight ejector assembly 5 includes an ejector block 51 and an ejector rod 52, wherein the ejector block 51 is fixedly installed on the top of the ejector rod 52, and the lower end of the ejector rod 52 passes downward through the rear mold 1 and the ejector plate 2 in sequence, and is fixedly installed to the bottom surface of the ejector panel in the ejector plate 2 by a countersunk bolt; a guide block 53 is also fixedly installed on the bottom surface of the rear mold 1 to adapt to the setting position of the ejector rod 52, and the above-mentioned ejector rod 52 is slidably installed in the guide through-holes of the rear mold 1 and the guide block 53.

[0025] Combine Figure 3 As shown, the sharp edge 41 at the bottom front end of the core-pulling slider 4 contacts the top surface of the ejector block 51 in the mold-closed state to form a sealing surface 7. The top surface of the ejector block 51 is provided with three sections of inclined surfaces connected to each other in sequence, which are, from the side close to the molding of the product 6 to the side close to the core-pulling slider, the lower sealing surface 511, the buffer pressing surface 512, and the large C-angle inclined surface 513. The inclination angle of the buffer pressing surface 512 is smaller than that of the lower sealing surface 511, while the inclination angle of the large C-angle inclined surface 513 is larger than that of the lower sealing surface 511, with a chamfer setting close to 45°. At the same time, the setting length of the buffer pressing surface 512 is shorter than that of the lower sealing surface 511. Correspondingly, the front end bottom surface of the core-pulling slider 4 is opposite to the position of the ejection block 51, and an upper sealing surface 42 and a contact surface 43 are provided in sequence from the molding side close to the product 6 to the direction away from it, wherein the upper sealing surface 42 is parallel to the lower sealing surface 511, and the setting angle of the contact surface 43 is smaller than the setting angle of the upper sealing surface 42, and the contact surface 43 is parallel to the buffer pressing surface 512.

[0026] The specific operating principle is as follows: When the product 6 is demolded after injection molding, the core-pulling slider 4 on the rear mold 1 first slides backward under the power of its driving cylinder to avoid the rising space of the straight ejector assembly 5, and then the ejector plate 2 moves upward, driving the ejector rod 52 and the ejector block 51 to eject the product 6 upward. When the product 6 is taken out, during the mold closing operation, the above-mentioned straight ejector assembly 5 first resets downward. When it resets downward to the bottom under normal operation, the core-pulling slider 4 slides directly to the sealing surface 7 under the action of its driving force. The sharp corner edge 41 at the bottom of its front end is tightly fitted with the lower sealing surface 511 of the top surface of the ejector block 51, forming a sealed sealing surface 7, and then injection molding is carried out. If due to the cylinder reset distance error and many other reasons, the straight top assembly 5 may not be reset to the bottom. The ejector block 51 has a maximum height error of about 0.5mm, which protrudes a certain height compared to the normal reset position. At this time, the corresponding detection signal in the mold also shows normal, and then the core pulling slider 4 will slide and reset under the action of its driving force. During the reset process of the core pulling slider 4, due to the inclined surface setting on the bottom surface of its front end, the contact surface 43 first contacts and slides with the top angle position of the large C-angle inclined surface 513 on the ejector block 51, forcing the straight top assembly 5 downward. At this time, the large C-angle inclined surface 513 also plays a guiding role; then the corner between the contact surface 43 on the core pulling slider 4 and the upper sealing surface 42 slides with the buffer pressing surface 512 on the ejector block 51, refer to Figure 8 As shown, the straight ejector assembly 5 is pressed downward again until the upper sealing surface 42 of the core-pulling slider 4 contacts the upper and lower sealing surfaces 511 of the ejection block 51. The straight ejector assembly 5 is then reset to its lowest position. The front end bottom sharp corner edge 41 of the core-pulling slider 4 and the top surface of the ejection block 51 form a tightly fitting sealing surface 7, and then the glue is injected and molded. During the entire mold closing process, the front end bottom sharp corner edge 41 of the core-pulling slider 4 never collides with the ejection block 51, effectively preventing damage to the sealing surface 7 from impacting the mold and improving product molding quality.

[0027] The measurement basis of the above-mentioned inclination angle is the angle between the angle and the horizontal plane.

[0028] The integral injection mold may be provided with a plurality of sets of the above-mentioned straight top components 5 and corresponding inclined surfaces. The relevant technical features that have not been mentioned or described in the above-mentioned embodiments can be realized by adopting or drawing on the relevant technical solutions in the prior art.

[0029] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by technicians in this technical field within the essential scope of the present invention should also fall within the scope of protection of the present invention.

Claims

1. A mold closing anti-collision mechanism for the sealing surface inside a mold, characterized by: The cam is fixedly mounted on the top of the ejector rod, and the lower end of the ejector rod passes downward through the rear mold and the ejector plate in sequence, and is fixedly mounted on the bottom surface of the ejector panel in the ejector plate; the sharp corner edge of the front bottom of the core-pulling slider contacts the top surface of the ejector block in the mold closing state to form a sealing surface; the top surface of the ejector block is provided with a plurality of interconnected inclined surfaces, which are a lower sealing surface, a buffer pressing surface and a large C-angle inclined surface from the side close to the product molding to the side of the core-pulling slider in sequence, and correspondingly, an upper sealing surface and a contact surface are provided on the bottom surface of the front end of the core-pulling slider in sequence; during the mold closing operation, the sharp corner edge of the front bottom of the core-pulling slider is always not in contact with the ejector block; The inclination angle of the buffer pressing surface in the top surface of the ejection block is smaller than the setting angle of the lower sealing surface, and the inclination angle of the large C-angle inclined surface is larger than the setting angle of the lower sealing surface; the setting length of the buffer pressing surface is smaller than the setting length of the lower sealing surface; The upper sealing surface of the front end bottom surface of the core-pulling slider is parallel to the lower sealing surface of the ejection block, the inclination angle of the contact surface is smaller than the inclination angle of the upper sealing surface, and is parallel to the buffer pressing surface of the ejection block.

2. A mold closing anti-collision mechanism for a sealing surface in a mold according to claim 1, characterized in that: During the mold closing process, when the above-mentioned straight ejection assembly is reset to the bottom, the above-mentioned core-pulling slider slides directly to the sealing surface position under the action of its driving force, and the sharp corner edge of the front end bottom of the core-pulling slider is tightly fitted with the middle and lower sealing surface of the top end surface of the ejection block.

3. The mold closing anti-collision mechanism for the sealing surface of a mold according to claim 1, characterized in that: During the mold closing process, when the above-mentioned straight ejector assembly has not yet returned to the bottom, the contact surface on the core-pulling slider first contacts and slides with the top corner of the large C-angle inclined surface on the ejection block, pressing the straight ejector assembly downward, and then the corner between the contact surface and the upper sealing surface slides and contacts with the buffer pressing surface on the ejection block, and the straight ejector assembly is pressed downward again until the sharp corner edge of the front end bottom of the above-mentioned core-pulling slider is tightly fitted with the middle and lower sealing surface of the top end surface of the ejection block.

4. The mold closing anti-collision mechanism for the sealing surface of a mold according to claim 1, characterized in that: A guide block is fixedly installed on the bottom surface of the rear mold by countersunk bolts, and the ejector rod is slidably inserted into the through hole of the guide block.

5. The mold closing anti-collision mechanism for the sealing surface inside the mold according to claim 1, characterized in that: The rear end side of the core-pulling slider is connected to the end of the piston rod of the driving cylinder, and the driving cylinder is fixedly installed on the rear mold.

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