An injection mold for automobile lampshade

Abstract

The present invention provides an injection mold for an automobile lampshade, which belongs to the field of mold technology. It solves the technical problem that the existing injection mold for automobile lampshades easily causes product damage. The injection mold for the automobile lampshade includes a mold frame, a slider, and a driving connecting rod that can drive the slider to move up and down. The slider is provided with a plug rod and a control rod that are horizontally placed on the left and right and coaxially movably connected. An elastic part that can be compressed when the two slide toward each other is arranged against each other. The inner wall of the mold frame is provided with a positioning hole. The end of the plug rod extending out of the slider is positioned and inserted into the positioning hole. The upper end of the driving connecting rod is movably connected to the end of the control rod and is always limited in the left and right directions. The driving connecting rod can move downward relative to the slider so that the control rod drives the plug rod to move toward the side where the driving connecting rod is located and disengage from the positioning hole. The present invention can avoid product damage caused by the direct fall of the slider, thereby ensuring product quality.

Description

Technical Field

[0001] The invention belongs to the technical field of molds and relates to an injection mold for an automobile lampshade. Background Art

[0002] In injection molds, for molds with complex product shapes, it is often necessary to use longitudinal, transverse and oblique core pulling or a combination of these to complete the core pulling operation.

[0003] The patent application publication number CN102343651A discloses a locking and obliquely withdrawing device for an injection mold fixed die oblique slide, which is characterized by comprising an oblique slide (1), a guide slide (2), and an oil cylinder (3). A linkage device is provided in the fixed die, wherein the oil cylinder and the guide slide drive the oblique slide to lock and obliquely withdraw. The guide slide is provided with a guide rail groove of a locking section and an obliquely withdrawing section. The oblique slide is provided with a sliding shaft. When working, the oil cylinder pulls the guide slide to move horizontally. The guide rail groove of the guide slide drives the oblique slide to lock and obliquely withdraw through the sliding shaft of the oblique slide. When the sliding shaft is located in the locking section of the guide rail groove, the oblique slide is locked.

[0004] The above mold simplifies the mold structure by means of oblique core pulling. However, for products with more complex shapes such as automobile lampshades, it is often necessary to design a spring core pulling structure driven uniformly by oil pressure inside the large slider for forming an inverted snap-in position, which is not applicable to the above mold. When the large slider is located on the ground side, since the large slider is relatively heavy, strong pressure is applied to the driving device such as the cylinder to move downward. When the internal pressure exceeds the load, the rubber cylinder will expand and deform. In this way, when the mold is opened, the spring core pulling structure droops and moves before the slider is pulled out, causing the product to be stretched. For this reason, general technicians in this field can easily consider the following: 1. Lightweight design of the slider, designing weight-reducing holes for the slider or using a material with lower density; 2. Strengthening the load-bearing capacity of the driving device; 3. Designing additional driving devices to independently control the demoulding procedures of the spring core pulling structure and the slider, and execute them independently in sequence. Summary of the Invention

[0005] In view of the above problems existing in the prior art, the present invention provides an injection mold for an automobile lampshade. The technical problem to be solved by the present invention is to prevent the slider from damaging the product when demoulding.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] A mold for an automobile lampshade, comprising a mold frame, a slider, and a driving connecting rod capable of driving the slider to move up and down, characterized in that an insertion rod and a control rod are inserted into the slider and are arranged horizontally on the left and right and coaxially movably connected. An elastic member that can be compressed when the two slide toward each other is arranged in abutment with each other. A positioning hole is provided on the inner side wall of the mold frame, and the end of the insertion rod extending out of the slider is positioned and inserted in the positioning hole. The upper end of the driving connecting rod is movably connected to the end of the control rod and is always limited in the left and right directions. The driving connecting rod can move downward relative to the slider so that the control rod drives the insertion rod to move toward the side where the driving connecting rod is located and disengage from the positioning hole.

[0008] The mold frame is the basic platform of the mold. The core and the movable slider are both arranged on the mold frame. The slider is used to cooperate with the core to form an injection mold cavity. After the injection molding is completed, the slider can slide independently and directionally to demould, so as to avoid interference when the product with complex shape is demoulded. The driving connecting rod is used to drive the slider to slide up and down; by arranging a left and right horizontal and coaxially sliding plug rod and a control rod in the slider, and arranging an elastic member between the plug rod and the control rod, the end of the plug rod extending out of the slider is positioned and inserted in the positioning hole. In this way, during the injection molding process, the two ends of the plug rod are respectively located in the positioning hole and the slider, and the slider is constrained by the plug rod and maintains a stable position with the mold frame. Even if the weight of the slider is large, its own weight will not act on the driving connecting rod, thereby avoiding long-term load on the driving device that remains in a locked state below the driving connecting rod, which causes the slider to move down and affect the product quality. At the same time, the end of the control rod is arranged with the driving connecting rod The upper end of the movable connecting rod is movably connected and always limited to the left and right, and when the driving connecting rod is moved downward, the control rod can be driven to move horizontally and the insert rod can be disengaged from the positioning hole. In this way, the driving connecting rod moves upward relative to the slider during the mold closing process. At this time, the control rod slides toward the insert rod under the constraint of the left and right limits of the driving connecting rod and can compress the elastic part. When the mold is closed, the insert rod is aligned with the positioning hole and can pop out and insert into the positioning hole by itself under the action of the elastic part. The elastic modulus requirement of the elastic part is low, which is conducive to reducing the friction between the insert rod and the mold frame when the mold is closed, ensuring smooth movement. When demolding, the driving connecting rod moves downward and drives the control rod to move horizontally to the right. At the same time, the control rod will pull the insert rod gradually out of the positioning hole. Only after it is completely out of the positioning hole will the slider move down to realize demolding. Before the slider is demolded, the independent undercut insert arranged on the slider has enough time to pull the core in advance under the control of the same driving source, so as to avoid the slider directly falling and causing product damage, thereby ensuring product quality.

[0009] In the aforementioned injection mold for the automotive headlight cover, the drive link includes a guide slot arranged obliquely from top to bottom toward the side where the positioning hole is located. The ends of the control lever are connected to pins disposed forward and backward. The pins are inserted into the guide slots and located at their lower ends. This allows the control lever to engage the oblique guide slots on the drive link via the pins, ensuring smoother and more stable operation of the control lever by the drive link. Furthermore, the direct connection between the control lever and the drive link prevents control failures caused by component separation, ensuring stable operation and product quality.

[0010] In the aforementioned automotive lampshade injection mold, the slider is fixed with a stopper, and the outer periphery of the driving connecting rod has a support surface arranged vertically opposite the bottom surface of the stopper. This allows the driving connecting rod's support surface to provide support for the entire slider via the stopper during mold closing. This, in turn, works in conjunction with the insertion rod and the locating hole to maintain force balance on the slider, ensuring a more stable sliding position.

[0011] In the aforementioned automotive headlight cover injection mold, a vertically arranged compression spring is positioned between the bottom surface of the stopper and the support surface. This compression spring is positioned around the periphery of the drive link. When the insertion rod is released from the positioning hole, the entire slider moves downward to release the mold, causing the stopper to move toward the support surface. This allows the compression spring to preemptively support the slider, thereby mitigating the slider's impact on the drive link and ensuring stable movement of the drive link and a consistent demolding experience.

[0012] In the aforementioned injection mold for the automotive lampshade, the guide slot is in the shape of an arc that arches upward toward the side where the positioning hole is located. During the demolding process, the pin on the control rod moves upward relative to the driving connecting rod along the guide slot. When the insertion rod is released from the positioning hole, the pin on the control rod moves downward relative to the driving connecting rod along the guide slot under the influence of the slider's own weight. The guide slot is configured to be in the shape of an arc that arches upward toward the side where the positioning hole is located, so that the pin receives more vertical force support from the inner wall of the guide slot in the initial stage of downward movement, thereby preventing the slider from falling too quickly. In the middle and late stages, the slider receives sufficient support from the compression spring, thereby effectively reducing the slider's speed fluctuations throughout the demolding process, ensuring the demolding effect and product quality.

[0013] In the above-mentioned injection mold of the automobile lampshade, the end of the insertion rod extending out of the slider is in a rounded shape, which helps the insertion rod to be more accurately inserted into the positioning hole to form a lock when it pops out.

[0014] In the above-mentioned injection mold of the automobile lampshade, the upper end of the driving connecting rod is inserted into the slider, so that the driving connecting rod can be guided and constrained by the inner wall of the slider, which is conducive to ensuring a more precise control effect on the control rod.

[0015] In the aforementioned automotive lampshade injection mold, the mold also includes a core. A stopper is detachably connected to the top of the slider, which abuts against the core above. The core serves as a travel limiter for the slider. That is, when the slider moves to the core, the insertion rod aligns with the positioning hole. The insertion rod snaps into the positioning hole, locking the mold. The stopper is located at the top of the slider, making it easy for the operator to remove and replace the stopper to ensure that the movable rod is aligned with the positioning hole when the stopper abuts the core, facilitating maintenance and adjustment.

[0016] In the above-mentioned injection mold for the automobile lampshade, the mold frame is fixed with a vertically arranged slide rail, and the slider is slidably connected to the slide rail. This helps to ensure the accurate movement trajectory of the slider, thereby making the mechanism run stably and ensuring the quality of the injection molded product.

[0017] In the aforementioned injection mold for the automotive lampshade, a drive cylinder is fixed to the mold frame, and the lower end of the drive connecting rod is connected to the output end of the drive cylinder. The drive cylinder can be an oil cylinder, which can provide sufficient force to the drive connecting rod to ensure that the drive connecting rod can achieve directional and stable feeding.

[0018] Compared with the prior art, the advantages of the present invention are as follows:

[0019] During the injection molding process of the automobile lampshade, the two ends of the insert rod are respectively located in the positioning hole and the slider. The slider is constrained by the insert rod and maintains a stable position relative to the mold frame. Even if the slider is heavy, its own weight will not act on the driving connecting rod, thereby avoiding long-term load on the driving device that is locked below the driving connecting rod, which may cause the slider to move downward and affect product quality. At the same time, during the mold closing process, the control rod is acted upon by the driving connecting rod to slide toward the insert rod and compress the elastic member. When the mold is closed, the insert rod is aligned with the positioning hole and can automatically pop out and insert into the positioning hole under the action of the elastic member. The elastic modulus requirement for the elastic member is low, which is conducive to reducing the friction between the insert rod and the mold frame during mold closing and ensuring smooth movement. During demolding, the driving connecting rod moves downward and drives the control rod away. At the same time, the control rod pulls the insert rod gradually out of the positioning hole. Only after it is completely out of the positioning hole will the slider move downward to achieve demolding. Before the slider is demolded, the independent undercut insert arranged on the slider has enough time to pull the core in advance under the control of the same driving source, thereby avoiding the slider directly falling and causing product damage, thereby ensuring product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a three-dimensional structural diagram of this injection mold.

[0021] Figure 2 It is a side structural schematic diagram of this injection mold.

[0022] Figure 3 yes Figure 2 Schematic diagram of the AA cross-section structure in.

[0023] Figure 4 yes Figure 3 Enlarged view of part B in .

[0024] Figure 5 This is a schematic cross-sectional view of the local structure of the injection mold when the insert rod is separated from the positioning hole.

[0025] In the figure, 1, mold frame; 11, positioning hole; 12, slide rail;

[0026] 2. Slider; 21. Limiting part;

[0027] 3. Driving connecting rod; 31. Guide chute; 32. Support surface; 33. Compression spring;

[0028] 4. Insert the rod;

[0029] 5. Control lever; 51. Pin;

[0030] 6. Elastic part; 7. Core; 8. Stop adjustment plate; 9. Drive cylinder. DETAILED DESCRIPTION

[0031] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solutions of the present invention, but the present invention is not limited to these embodiments.

[0032] like Figure 1-5As shown, the injection mold of the automobile lampshade includes a mold frame 1, a slider 2 and a driving connecting rod 3 that can drive the slider 2 to move up and down. The slider 2 is provided with an insertion rod 4 and a control rod 5 that are horizontally arranged left and right and coaxially slidably connected. An elastic member 6 that can be compressed when the two slide toward each other is arranged against the insertion rod 4 and the control rod 5. The elastic member 6 is a spring. The inner side wall of the mold frame 1 has a positioning hole 11. The end of the insertion rod 4 extending out of the slider 2 is positioned and inserted in the positioning hole 11. The upper end of the driving connecting rod 3 is slidably connected to the end of the control rod 5 and is limited in the left and right directions. The end of the control rod 5 is vertically supported on the driving connecting rod 3. When the mold is opened, the driving connecting rod 3 can move downward relative to the slider 2 so that the control rod 5 drives the insertion rod 4 to move toward the side where the driving connecting rod 3 is located and disengages from the positioning hole 11. When the mold is closed, the driving connecting rod 3 can move upward relative to the slider 2 and make the control rod 5 move toward the side where the insertion rod 4 is located. The mold frame 1 is the basic platform of the mold. The core 7 and the movable slider 2 are both arranged on the mold frame 1. The slider 2 is used to cooperate with the core 7 to form an injection mold cavity. After the injection molding is completed, the slider 2 can slide and be demoulded independently to avoid interference when the product with a complex shape is demoulded. The driving connecting rod 3 is used to drive the slide to slide up and down; by arranging a left and right horizontal insertion rod 4 and a control rod 5 that are coaxially slidably connected and an elastic member 6 is arranged between the insertion rod 4 and the control rod 5, the end of the insertion rod 4 extending out of the slider 2 is positioned and inserted into the positioning hole 11. In this way, during the injection molding process, the two ends of the insertion rod 4 are respectively located in the positioning hole 11 and the slider 2. The slider 2 is constrained by the insertion rod 4 and maintains a stable position with the mold frame 1. Even if the weight of the slider 2 is large, its own weight will not act on the driving connecting rod 3, thereby avoiding causing a long-term load on the driving device that remains in a locked state below the driving connecting rod 3, which causes the slider 2 to move down and affect the product quality. When the mold is in place, the plug rod 4 and the positioning hole 11 are aligned, and the elastic member 6 can be automatically popped out and inserted into the positioning hole 11 under the action of the elastic member 6. The elastic modulus of the elastic member 6 is required to be low, which is conducive to reducing the friction between the plug rod 4 and the mold frame 1 when the mold is closed, ensuring smooth movement. When the mold is demolded, the driving link 3 moves down and drives the control rod 5 away. At the same time, the control rod 5 will pull the plug rod 4 gradually out of the positioning hole 11. After it is completely out of the positioning hole 11, the slider 2 moves down to realize demolding. Before the slider 2 is demolded, the independent undercut inserts arranged on the slider 2 have enough time to pull the core in advance under the control of the same driving source, avoiding the slider 2 directly falling and causing product damage, thereby ensuring product quality. Specifically, the driving connecting rod 3 has a guide groove 31 that is arranged obliquely from top to bottom toward the side where the positioning hole 11 is located. The end of the control rod 5 is connected to a pin shaft 51 set in the front and rear. The pin shaft 51 is inserted into the guide groove 31 and is located at the lower end of the guide groove 31.In this way, the control rod 5 cooperates with the inclined guide slot 31 on the drive link 3 through the pin 51, making the drive link 3's operation of the control rod 5 smoother and more stable. The direct connection between the control rod 5 and the drive link 3 can avoid control failure caused by component separation, ensuring stable operation and product quality. The slider 2 is fixed with a limit portion 21, and the outer periphery of the drive link 3 has a support surface 32 arranged relative to the bottom surface of the limit portion 21 in the vertical direction. In this way, during the mold closing process, the support surface 32 of the drive link 3 can provide support for the entire slider 2 through the limit portion 21, and then cooperate with the mating point of the insert rod 4 and the positioning hole 11 to maintain the force balance of the slider 2, making the sliding position more stable. A compression spring 33 arranged in the vertical direction is provided between the bottom surface of the limit portion 21 and the support surface 32. The compression spring 33 is sleeved on the outer periphery of the drive link 3. When the insertion rod 4 is released from the positioning hole 11, the entire slider 2 moves downward to release from the mold, causing the stopper to move toward the support surface 32. This allows the compression spring 33 to intervene in advance to support the slider 2, thereby reducing the impact of the slider 2 on the driving connecting rod 3, ensuring stable movement and demolding of the driving connecting rod 3. Preferably, the guide groove 31 is an arc that arches upward toward the side where the positioning hole 11 is located. The spacing between the upper and lower ends of the guide groove 31 in the left-right direction is greater than the size of the insertion rod 4 extending into the positioning hole 11. During the demolding process, the pin 51 on the control rod 5 moves upward along the guide slot 31 relative to the drive link 3. Once the insertion rod 4 is released from the positioning hole 11, the pin 51 on the control rod 5 moves downward along the guide slot 31 relative to the drive link 3 under the influence of the slider 2's own weight. The guide slot 31 is designed to be curved upward toward the side where the positioning hole 11 is located. This allows the pin 51 to receive more vertical force support from the inner wall of the guide slot 31 in the initial stages of its downward movement, thereby preventing the slider 2 from falling too quickly. In the middle and later stages, the slider 2 receives sufficient support from the compression spring 33, effectively reducing speed fluctuations throughout the demolding process, ensuring demolding effectiveness and product quality. The end of the insertion rod 4 extending from the slider 2 is rounded. This facilitates more accurate insertion of the insertion rod 4 into the positioning hole 11 upon ejection, forming a locking mechanism. The upper end of the drive link 3 is inserted into the slider 2. In this way, the driving connecting rod 3 can be guided and constrained by the inner wall of the slider 2, which helps to ensure more precise control of the control rod 5. The end of the control rod 5 is inserted into the end surface of the insertion rod 4. The elastic member 6 is located inside the insertion rod 4 and abuts against the inserted end of the control rod 5. The end of the insertion rod 4 has a limit ring to prevent the control rod 5 from falling out of the insertion rod 4.

[0033] like Figure 1-5As shown, the injection mold also includes a core 7, and the top of the slider 2 is detachably connected to a stop adjustment plate 8, which is in contact with the core 7 above. The core 7 can serve as a travel limit for the slider 2, that is, when the slider 2 moves to the core 7, the insertion rod 4 is aligned with the positioning hole 11, and the insertion rod 4 is locked when it is ejected into the positioning hole 11. The stop adjustment plate 8 is arranged on the top of the slider 2, which is convenient for the operator to remove and replace the stop adjustment plate 8 so that the movable rod is aligned with the positioning hole 11 when the stop adjustment plate 8 just contacts the core 7, which is convenient for maintenance and adjustment. A vertically arranged slide rail 12 is fixed on the mold frame 1, and the slider 2 is slidably connected to the slide rail 12. This helps to ensure the accuracy of the movement trajectory of the slider 2, thereby ensuring the stable operation of the mechanism and ensuring the quality of the injection molded product. A drive cylinder 9 is fixed on the mold frame 1, and the lower end of the drive connecting rod 3 is connected to the output end of the drive cylinder 9. The driving cylinder 9 is an oil cylinder, which can provide sufficient force to the driving connecting rod 3, thereby ensuring that the driving connecting rod 3 can achieve directional and stable feeding.

[0034] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope of the appended claims.

Claims

1. An injection mold for an automobile lampshade, comprising a mold frame (1), a slider (2), and a driving connecting rod (3) capable of driving the slider (2) to move up and down, characterized in that: The slider (2) is provided with an insert rod (4) and a control rod (5) which are horizontally arranged on the left and right and are coaxially movably connected. An elastic member (6) which can be compressed when the insert rod (4) and the control rod (5) slide toward each other is arranged in abutment with each other. A positioning hole (11) is provided on the inner side wall of the mold frame (1). The end of the insert rod (4) extending from the slider (2) is positioned and inserted in the positioning hole (11). The upper end of the driving connecting rod (3) is movably connected to the end of the control rod (5) and is always limited in the left and right directions. The driving connecting rod (3) has a guide slot (31) arranged from top to bottom and tilted toward the side where the positioning hole (11) is located. The end of the control rod (5) is connected to a pin shaft (51) arranged in front and back. The pin shaft (51) is inserted into the guide slot (31) and is located at the lower end of the guide slot (31). The driving connecting rod (3) can move downward relative to the slider (2) so that the control rod (5) drives the insertion rod (4) to move toward the side where the driving connecting rod (3) is located and disengage from the positioning hole (11).

2. The injection mold for the automobile lampshade according to claim 1, characterized in that: A limiting portion (21) is fixedly provided on the slider (2), and the outer periphery of the driving connecting rod (3) has a supporting surface (32) arranged opposite to the bottom surface of the limiting portion (21) in the up-down direction.

3. The injection mold for the automobile lampshade according to claim 2, characterized in that: A compression spring (33) arranged in an up-down direction is provided between the bottom surface of the limiting portion (21) and the supporting surface (32), and the compression spring (33) is sleeved on the periphery of the driving connecting rod (3).

4. The injection mold for the automobile lamp cover according to claim 1, 2 or 3, characterized in that: The guide slot (31) is in the shape of an arc that arches upward toward the side where the positioning hole (11) is located.

5. The injection mold for the automobile lamp cover according to claim 1 or 2, characterized in that: One end of the insertion rod (4) extending out of the slider (2) is in a round head shape.

6. The injection mold for the automobile lamp cover according to claim 1 or 2, characterized in that: The upper end of the driving connecting rod (3) is inserted into the sliding block (2).

7. The injection mold for the automobile lamp cover according to claim 1 or 2, characterized in that: The injection mold further comprises a core (7), and a stop adjustment piece (8) is detachably connected to the top of the slider (2), and the stop adjustment piece (8) is in position-limiting contact with the core (7) above.

8. The injection mold for the automobile lamp cover according to claim 1 or 2, characterized in that: A vertically arranged slide rail (12) is fixedly provided on the mold frame (1), and the slider (2) is slidably connected to the slide rail (12).

9. The injection mold for the automobile lamp cover according to claim 1 or 2, characterized in that: A driving cylinder (9) is fixedly provided on the mold frame (1), and the lower end of the driving connecting rod (3) is connected to the output end of the driving cylinder (9).

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