In-mold cutting injection mold with secondary ejection function
By introducing the secondary ejection mechanism of cutting and straight ejection needles into the foot mold, the problem of residual plastic parts in the molding cavity is solved, which improves production efficiency and reduces costs, while protects the mold.
Patent Information
- Application Number
- CN202420882579.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-26
- Publication Date
- 2024-12-20
- Estimated Expiration
- 2034-04-26
AI Technical Summary
During the production process of existing chair foot injection molds, the residual plastic parts in the molding cavity are difficult to cut and separate from the product, resulting in low production efficiency and high cost.
Design a secondary ejection in-mold cutting injection mold. Using the combination of the cutting thimble and the straight thimble, the first ejection cutting thimble inside the mold is cut into the plastic part. The second ejection straight thimble makes the product fall off and avoids manual treatment.
Improves production efficiency, reduces production costs, avoids the need for manual processing of plastic parts, and protects the mold through sleeves and spring structures.
Smart Images
Figure CN222201527U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of injection molds and relates to an in-mold cutting injection mold with secondary ejection. Background Art
[0002] A chair is a tool for users to rest. With the increasing social needs, the functions of chairs are becoming more and more diverse. Among them, the most common is a chair with a rotating function. The legs of this type of chair are provided with a rotating shaft, which supports the seat plate so that the seat plate can rotate on the legs. Therefore, a through-hole structure needs to be provided at the center of the legs to install the rotating shaft. Since the legs are made of plastic materials, most of them are produced by mold injection molding.
[0003] However, the chair leg injection mold in the prior art still has some shortcomings. In order to ensure that the molding cavity is filled more fully, the glue inlet is usually set at the central through hole. After the mold injection in the molding cavity is completed, excess glue parts will remain on the chair leg product, making the through hole closed. After the product is demoulded, the excess glue parts need to be cut off manually, which increases the production cost and reduces the production efficiency. Summary of the invention
[0004] The utility model aims to solve the problems existing in the prior art and proposes an in-mold cutting injection mold with secondary ejection. The technical problem to be solved by the utility model is: how to cut and separate the residual plastic parts from the chair leg product during the demoulding process of the mold.
[0005] The purpose of the utility model can be achieved through the following technical solutions: a secondary ejection in-mold cutting injection mold, comprising a fixed mold plate, a movable mold plate, a foot plate and a bottom plate arranged in sequence, the inner side of the foot plate is provided with a slidingly connected push plate, the fixed mold plate is provided with a fixed front mold core, the movable mold plate is provided with a fixed rear mold core, the front mold core and the rear mold core are connected to form a molding cavity, the molding cavity is provided with an injection-molded chair leg, the fixed mold plate is provided with a glue inlet, the glue inlet is provided with a glue flow channel, the bottom of the glue flow channel is connected to the molding cavity, the connection between the glue flow channel and the molding cavity is provided with a cutting ejector, the cutting ejector reciprocates inside the rear mold core, the bottom end of the cutting ejector extends to the outside of the bottom plate, the rear mold core is provided with a straight ejector, and the straight ejector is fixedly connected to the push plate.
[0006] In this scheme, the plastic raw material is heated to a molten state, and enters the glue inlet flow channel from the glue inlet to fill the molding cavity. The chair leg product is cooled and molded in the molding cavity. Before opening the mold, an ejection is performed, and an external force is used to push the cutting ejector pin to move to the side where the glue inlet flow channel is provided to cut the remaining glue-injected parts on the chair leg. The mold is then opened by the mold opening mechanism, and the push plate is moved. The push plate drives the fixed straight ejector pin to extend out of the rear mold core, and a second ejection is performed to make the chair leg product fall off from the rear mold core, completing the production of the chair leg product. In the above manner, the cutting ejector pin is ejected once inside the mold to separate the glue-injected parts in the glue inlet flow channel from the chair leg, and the straight ejector pin is ejected twice to make the chair leg product fall off from the mold, thereby avoiding the need to manually handle the glue-injected parts, improving production efficiency, and reducing production costs.
[0007] In the above-mentioned in-mold cutting injection mold with secondary ejection, the top of the cutting ejector pin is an arc structure that is concave inwards. The structure with the inner concave and the outer edge convex can better play a cutting role on the chair legs.
[0008] In the above-mentioned in-mold cutting injection mold with secondary ejection, a sleeve is fixedly provided on the outer side of the bottom end of the cutting ejector pin, and a spring is provided inside the sleeve, and the two ends of the spring are respectively against the sleeve and the bottom of the push plate. The sleeve structure can facilitate the pushing of the cutting ejector pin, and the spring placed inside the sleeve plays a buffering role to prevent the top of the cutting ejector pin from colliding with the glue inlet flow channel and causing damage to the inside of the mold.
[0009] In the above-mentioned in-mold cutting injection mold for secondary ejection, the chair foot is composed of a plurality of supporting legs, the bottom of the supporting legs is provided with a mesh grille, the ends of the supporting legs are provided with mounting holes, and the center of the chair foot is provided with a through hole. The structure of the mesh grille can improve the structural strength of the supporting legs, the mounting holes are used to install the universal wheels at the bottom of the supporting legs, so that the chair foot can be moved conveniently, and the through holes are formed by opening during the primary ejection, and are used to install the rotating shaft supporting the chair board.
[0010] In the above-mentioned secondary ejection in-mold cutting injection mold, a plurality of grid forming blocks are arranged inside the rear mold core, and the grid forming blocks are used to form a mesh grid structure at the bottom of the chair leg.
[0011] In the above-mentioned secondary ejection in-mold cutting injection mold, a plurality of fixed guide posts are provided inside the fixed mold plate, and a corresponding guide sleeve is provided on the movable mold plate, and the guide posts are slidably connected with the guide sleeve. The guide posts and the guide sleeve are used together to play a positioning role in the process of mold closing.
[0012] Compared with the prior art, the utility model has the following advantages:
[0013] 1. In this solution, a cutting ejector pin is ejected once inside the mold to separate the glue-feeding parts in the glue-feeding channel from the chair legs, and a straight ejector pin is ejected twice to make the chair legs fall off the mold, thus avoiding the need to manually handle the glue-feeding parts and open the through holes on the chair legs, thereby improving production efficiency and reducing production costs.
[0014] 2. In this solution, a sleeve structure is provided to facilitate pushing the cutting ejector pin, and a spring placed inside the sleeve acts as a buffer to prevent the top of the cutting ejector pin from colliding with the glue inlet channel and causing damage to the inside of the mold. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 This is a schematic diagram of the half-section structure of the injection mold of the utility model;
[0016] Figure 2 This is a schematic diagram of the opening structure of the injection mold of the utility model;
[0017] Figure 3 It is a schematic diagram of the structure of the chair leg product of the utility model when viewed from above.
[0018] In the figure, 1, fixed template; 1a, glue inlet; 1b, glue inlet channel; 1c, guide column; 2, movable template; 2a, guide sleeve; 3, foot plate; 4, bottom plate; 5, push plate; 6, front mold core; 7, rear mold core; 7a, grille forming block; 7b, straight ejector; 8, forming cavity; 9, chair foot; 9a, support leg; 9b, mesh grille; 9c, mounting hole; 9d, through hole; 10, cutting ejector; 11, sleeve; 11a, spring. DETAILED DESCRIPTION
[0019] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.
[0020] Example
[0021] like Figure 1 Combination Figure 2As shown, the injection mold includes, from left to right, a fixed mold plate 1, a movable mold plate 2, a foot plate 3 and a bottom plate 4 arranged in sequence, the inner side of the foot plate 3 is provided with a push plate 5 in sliding connection, the fixed mold plate 1 is provided with a glue inlet 1a, and a glue inlet flow channel 1b is provided at the bottom of the glue inlet 1a, the fixed mold plate 1 is provided with a fixed front mold core 6, the movable mold plate 2 is provided with a fixed rear mold core 7, a molding cavity 8 is provided between the front mold core 6 and the rear mold core 7, and a plurality of grid molding blocks 7a are provided inside the rear mold core 7, the bottom end of the glue inlet flow channel 1b is connected to the molding cavity 8, and a cutting ejector pin 10 is provided at the connection between the glue inlet flow channel 1b and the molding cavity 8, and the cutting ejector pin 10 is provided at the connection between the glue inlet flow channel 1b and the molding cavity 8. The cutting ejector pin 10 reciprocates inside the rear mold core 7. The top of the cutting ejector pin 10 is an inwardly concave arc structure. The bottom end of the cutting ejector pin 10 extends to the outside of the bottom plate 4. A fixed sleeve 11 is provided on the outside of the bottom end of the cutting ejector pin 10. A spring 11a is provided inside the sleeve 11. The two ends of the spring 11a are respectively abutted against the sleeve 11 and the bottom of the push plate 5. A plurality of straight ejector pins 7b are provided inside the rear mold core 7. The straight ejector pins 7b are fixedly connected to the push plate 5. A plurality of fixedly connected guide columns 1c are provided inside the fixed mold plate 1. A corresponding guide sleeve 2a is provided on the movable mold plate 2. The guide column 1c is slidably connected to the guide sleeve 2a.
[0022] like Figure 3 As shown, the chair leg 9 corresponds to the structure of the molding cavity 8, and the chair leg 9 is composed of a plurality of supporting legs 9a. A mesh grille 9b is provided at the bottom of the supporting leg 9a. The grille molding block 7a is used to form the mesh grille 9b structure at the bottom of the chair leg 9. A mounting hole 9c is provided at the end of the supporting leg 9a. A through hole 9d is provided at the center of the chair leg 9. The glue inlet channel 1b and the cutting ejector pin 10 are arranged on the upper and lower sides of the molding cavity 8 where the through hole 9d structure is formed.
[0023] The working principle of this scheme is as follows. After the mold is closed, the plastic raw material is heated to a molten state and enters the glue inlet 1a into the glue inlet channel 1b to fill the molding cavity 8. The chair leg 9 product is cooled and molded in the molding cavity 8. Before opening the mold, an ejection is performed. The sleeve 11 is pushed inward from the outside of the mold to move the cutting ejector 10 to the side where the glue inlet channel 1b is provided, and the remaining glue inlet parts at the through hole 9d are cut to form a through hole 9d on the chair leg 9. The mold is then opened by the mold opening mechanism, and the push plate 5 is moved. The push plate 5 drives the fixed straight ejector 7b to extend out of the rear mold core 7 for a second ejection, so that the chair leg 9 product falls off from the rear mold core 7, completing the production of the chair leg 9 product, avoiding the need to manually handle the glue inlet parts to open the through hole 9d on the chair leg 9, thereby improving production efficiency and reducing production costs.
[0024] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.
[0025] Although this article uses more terms such as 1, fixed template; 1a, glue inlet; 1b, glue inlet channel; 1c, guide column; 2, movable template; 2a, guide sleeve; 3, foot plate; 4, bottom plate; 5, push plate; 6, front mold core; 7, rear mold core; 7a, grid forming block; 7b, straight ejector; 8, molding cavity; 9, chair foot; 9a, support leg; 9b, mesh grid; 9c, mounting hole; 9d, through hole; 10, cutting ejector; 11, sleeve; 11a, spring, etc., it does not exclude the possibility of using other terms. The use of these terms is only to more conveniently describe and explain the essence of the utility model; interpreting them as any additional restrictions is contrary to the spirit of the utility model.
Claims
1. A secondary ejection in-mold cutting injection mold, comprising a fixed mold plate (1), a movable mold plate (2), a foot plate (3) and a bottom plate (4) arranged in sequence, the inner side of the foot plate (3) is provided with a slidingly connected push plate (5), the interior of the fixed mold plate (1) is provided with a fixed front mold core (6), the movable mold plate (2) is provided with a fixed rear mold core (7), the front mold core (6) and the rear mold core (7) are connected to form a molding cavity (8), and the molding cavity (8) is provided with an injection-molded chair leg (9), It is characterized in that The fixed mold plate (1) is provided with a glue inlet (1a), a glue inlet flow channel (1b) is provided inside the glue inlet (1a), the bottom of the glue inlet flow channel (1b) is connected to the molding cavity (8), a cutting ejector pin (10) is provided at the connection between the glue inlet flow channel (1b) and the molding cavity (8), the cutting ejector pin (10) reciprocates inside the rear mold core (7), the bottom end of the cutting ejector pin (10) extends to the outside of the bottom plate (4), a straight ejector pin (7b) is provided inside the rear mold core (7), and the straight ejector pin (7b) is fixedly connected to the push plate (5).
2. The in-mold cutting injection mold with secondary ejection according to claim 1, It is characterized in that The top of the cutting ejector pin (10) is in an inwardly concave arc structure.
3. The in-mold cutting injection mold with secondary ejection according to claim 2, It is characterized in that A sleeve (11) is fixedly provided on the outer side of the bottom end of the cutting ejector pin (10), a spring (11a) is provided inside the sleeve (11), and two ends of the spring (11a) are respectively against the sleeve (11) and the bottom of the push plate (5).
4. The in-mold cutting injection mold with secondary ejection according to claim 1, It is characterized in that The chair foot (9) is composed of a plurality of supporting legs (9a), the bottom of the supporting leg (9a) is provided with a mesh grille (9b), the end of the supporting leg (9a) is provided with a mounting hole (9c), and the center of the chair foot (9) is provided with a through hole (9d).
5. The in-mold cutting injection mold with secondary ejection according to claim 4, It is characterized in that A plurality of grid forming blocks (7a) are arranged inside the rear mold core (7), and the grid forming blocks (7a) are used to form a mesh grid (9b) structure at the bottom of the chair leg (9).
6. The in-mold cutting injection mold with secondary ejection according to claim 1, It is characterized in that The fixed template (1) is provided with a plurality of fixedly connected guide columns (1c) inside, and the movable template (2) is provided with corresponding guide sleeves (2a), and the guide columns (1c) are slidably connected to the guide sleeves (2a).