A demolding mechanism for injection molds

Abstract

This utility model relates to the field of injection mold technology and discloses a demolding mechanism for injection molds, including a support structure, a mold assembly, a demolding assembly, and a fixing structure. The mold assembly, demolding assembly, and fixing structure are respectively mounted on the support structure. The demolding assembly includes a hydraulic cylinder, with a fixing frame fixedly installed at the telescopic end of the hydraulic cylinder. The fixing frame is a cross-shaped frame extending outwards from the center point. A connecting rod is fixedly installed at the bottom of the end of the fixing frame. A screw is threaded onto the end of the connecting rod away from the fixing frame. A turntable is fixedly installed at the end of the screw outside the connecting rod. A fixing block is rotatably installed at the end of the screw away from the turntable. Two sidewalls on the fixing block, close to the screw, extend upwards to form baffles. This utility model uses the turntable to finely adjust the horizontal position of each fixing block, so that the contraction force of the hydraulic cylinder is evenly transmitted to the four connecting rods through the fixing frame, effectively preventing mold deformation and damage to the plastic part.

Description

Technical Field

[0001] This utility model relates to the field of injection mold technology, and in particular to a demolding mechanism for injection molds. Background Technology

[0002] Injection molds are widely used in the production of plastic products. The demolding mechanism is an important component of it. Its main function is to smoothly remove the injection-molded workpiece from the mold. Traditional demolding mechanisms usually use mechanical devices, such as push rods, cylinders, or springs, to push the workpiece away from the mold surface. This mechanism usually consists of multiple components, including the mold body, demolding device, and guide components, to ensure that the mold can open smoothly and release the workpiece smoothly after injection molding is completed.

[0003] An investigation revealed that a Chinese utility model patent (publication number: CN222451155U) discloses a demolding mechanism for injection molds. Although the patent uses two clamping plates that can be attached to the edge of the upper mold to fix regular upper molds of different lengths, and uses limiting components to press and fix the four sides of the lower mold, and then pulls the outer plate upward to separate the upper and lower molds, thus achieving the demolding effect, the two clamping plates of this device are fixed by attaching to the edge of the upper mold. This means that the force can only be applied from two points on the edge of the mold, making it difficult to form a uniform pulling force. This can easily lead to an imbalance of force on the upper mold, which may cause mold deformation, and may also cause the plastic part to break or get stuck in the mold due to uneven force, affecting the quality of the finished product. Utility Model Content

[0004] Given that the existing two clamping plates are fixed by adhering to the edge of the upper mold, they can only apply force and pull from two points on the edge of the mold, which makes it difficult to form a uniform pulling force. This can easily lead to an imbalance of force on the upper mold, which may cause mold deformation. It may also cause the plastic part to break or get stuck in the mold due to uneven force, affecting the quality of the finished product. Therefore, this utility model is proposed.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a demolding mechanism for an injection mold, comprising a support structure, a mold assembly, a demolding assembly, and a fixing structure. The mold assembly, demolding assembly, and fixing structure are respectively disposed on the support structure. The demolding assembly includes a hydraulic cylinder. A fixing frame is fixedly installed at the telescopic end of the hydraulic cylinder. The fixing frame is a cross-shaped frame extending outward from the center as the intersection point. A connecting rod is fixedly installed at the bottom of the end of the fixing frame. A screw is threadedly installed at the end of the connecting rod away from the fixing frame. A turntable is fixedly installed at the end of the screw outside the connecting rod. A fixing block is rotatably installed at the end of the screw away from the turntable. The two side walls of the fixing block, which are close to the screw, extend upward to form baffles.

[0006] As a preferred embodiment of the demolding mechanism of the injection mold of the present invention, the supporting structure includes a base plate, support columns are fixedly installed at the four corners of the top of the base plate, and a top plate is fixedly installed at the top of the support columns.

[0007] As a preferred embodiment of the demolding mechanism of the injection mold described in this utility model, the mold assembly includes an upper mold and a lower mold, the upper mold is disposed above the lower mold, and the sidewall of the upper mold extends outward.

[0008] In a preferred embodiment of the demolding mechanism of the injection mold described in this utility model, the hydraulic cylinder is fixedly installed on the outer top of the top plate, and the telescopic end of the hydraulic cylinder extends into the bottom of the top plate.

[0009] As a preferred embodiment of the demolding mechanism of the injection mold described in this utility model, the fixing structure includes a base, a two-way lead screw, a motor and a socket. The base is fixedly installed on the top of the base plate, and a limiting frame adapted to the lower mold is fixedly installed on the top of the base.

[0010] As a preferred embodiment of the demolding mechanism of the injection mold described in this utility model, the base has mounting grooves on both sides of its top end, the bidirectional lead screw is rotatably installed inside the base, the threaded end of the bidirectional lead screw is located inside the mounting groove, the motor is fixedly installed on the outer side wall of the base, and the motor shaft of the motor is fixedly connected to one end of the bidirectional lead screw.

[0011] As a preferred embodiment of the demolding mechanism of the injection mold of the present invention, the base is fixedly installed with guide rails on the top and both sides of the mounting groove, a sliding plate is threaded on the bidirectional lead screw, the two ends of the sliding plate are slidably connected to the guide rails, and insert rods are symmetrically fixed on the opposite side of the sliding plate, and the insert holes are provided on both sides of the lower mold.

[0012] The beneficial effects of this utility model are:

[0013] 1. By fine-tuning the horizontal position of each fixing block through the turntable, the fixing block is precisely locked at the four corners of the side wall of the upper mold extending outward. A stable clamping is formed from the four symmetrical points at the top of the upper mold, so that the contraction and pulling force of the hydraulic cylinder is evenly transmitted to the four connecting rods through the fixing frame. During the separation of the upper mold and the lower mold, a balanced and stable lifting force is always maintained, which effectively prevents mold deformation and damage to plastic parts, and also avoids demolding jamming caused by uneven pulling force, thus improving demolding efficiency and product quality.

[0014] 2. The motor drives the bidirectional lead screw to rotate, causing the two sliding plates on both sides to move synchronously towards the lower mold along the guide rail, so that the insert rod can be accurately inserted into the insertion hole. It can form a symmetrical and uniform fixing force from both sides of the mold, ensuring the mold position is stable during injection molding. The fixing can be quickly released by reversing the motor, making it easy to remove the lower mold. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Among them:

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0017] Figure 2 This is a schematic diagram of the support structure of this utility model;

[0018] Figure 3 This is a schematic diagram of the demolding component of this utility model;

[0019] Figure 4 for Figure 3 A magnified view of a portion of point A;

[0020] Figure 5 This is a schematic diagram of the upper part of the base of this utility model;

[0021] Figure 6 This is a schematic diagram of the fixing structure of this utility model.

[0022] Explanation of reference numerals in the attached figures:

[0023] 1. Support structure; 11. Base plate; 12. Support column; 13. Top plate; 2. Mold assembly; 21. Lower mold; 22. Upper mold; 3. Demolding assembly; 301. Hydraulic cylinder; 302. Fixing frame; 303. Connecting rod; 304. Screw; 305. Turntable; 306. Fixing block; 4. Fixing structure; 401. Base; 402. Limiting frame; 403. Mounting groove; 404. Two-way lead screw; 405. Motor; 406. Guide rail; 407. Slide plate; 408. Insert rod; 409. Insertion hole. Detailed Implementation

[0024] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0025] Example 1

[0026] Refer to attached figure Figure 1 - Appendix Figure 5 This is the first embodiment of the present invention, which provides a demolding mechanism for an injection mold, including a support structure 1, a mold assembly 2, a demolding assembly 3, and a fixing structure 4. The mold assembly 2, the demolding assembly 3, and the fixing structure 4 are respectively disposed on the support structure 1. The support structure 1 includes a base plate 11, and support columns 12 are fixedly installed at the four corners of the top of the base plate 11. A top plate 13 is fixedly installed at the top of the support columns 12. The mold assembly 2 includes an upper mold 22 and a lower mold 21. The upper mold 22 is disposed above the lower mold 21, and the sidewall of the upper mold 22 extends outward.

[0027] The demolding assembly 3 includes a hydraulic cylinder 301, which is fixedly installed on the outer top of the top plate 13. The telescopic end of the hydraulic cylinder 301 extends into the bottom of the top plate 13. A fixing frame 302 is fixedly installed on the telescopic end of the hydraulic cylinder 301. The fixing frame 302 is a cross-shaped frame extending outward from the center. A connecting rod 303 is fixedly installed at the bottom of the end of the fixing frame 302. A screw 304 is threadedly installed on the end of the connecting rod 303 away from the fixing frame 302. A turntable 305 is fixedly installed on the end of the screw 304 outside the connecting rod 303. A fixing block 306 is rotatably installed on the end of the screw 304 away from the turntable 305. The two side walls of the fixing block 306, which are close to the screw 304, extend upward to form a baffle.

[0028] During use, the lower mold 21 is first fixed by the fixing structure 4. Then, the hydraulic cylinder 301 is activated. The telescopic end of the hydraulic cylinder 301 pushes the fixing frame 302 downward, causing the fixing frame 302 to drive the connecting rod 303 and the screw 304 to descend. The turntable 305 is rotated, causing the screw 304 to rotate on the threaded connection rod 303, thereby adjusting the horizontal position of the fixing block 306. The fixing block 306 is precisely locked at the four corners of the side wall of the upper mold 22, ensuring that the fixing block 306 can stably lock the upper mold 22. Then, the hydraulic cylinder 301 retracts, driving the fixing block 306 to lift the upper mold 22 upward, separating the upper mold 22 from the lower mold 21, and completing the demolding operation.

[0029] Example 2

[0030] Refer to attached figure Figure 5 and attached Figure 6 This is the second embodiment of the present invention, which differs from the first embodiment in that:

[0031] The fixed structure 4 includes a base 401, a bidirectional lead screw 404, a motor 405, and a socket 409. The base 401 is fixedly installed on the top of the base plate 11. A limiting frame 402 adapted to the lower mold 21 is fixedly installed on the top of the base 401. The lower mold 21 is placed inside the base 401. Mounting grooves 403 are respectively provided on both sides of the top of the base 401. The bidirectional lead screw 404 is rotatably installed inside the base 401. The threaded end of the bidirectional lead screw 404 is located inside the mounting groove 403. 405 is fixedly installed on the outer side wall of the base 401, and the motor shaft of the motor 405 is fixedly connected to one end of the double-acting screw 404. The top of the base 401 and the two sides of the mounting groove 403 are fixedly installed with guide rails 406. The double-acting screw 404 is threadedly installed with a slide plate 407. The two ends of the slide plate 407 are slidably connected to the guide rails 406. The opposite side of the slide plate 407 is symmetrically fixed with a plug rod 408. The plug hole 409 is set on both sides of the lower mold 21 and is adapted to the plug rod 408.

[0032] During use, the lower mold 21 is placed inside the base 401. The limiting bracket 402 at the top of the base 401 initially limits its movement. Then, the motor 405 is started. The motor shaft of the motor 405 drives the bidirectional lead screw 404 to rotate inside the base 401. The threaded end of the bidirectional lead screw 404 drives the sliding plate 407. The sliding plate 407 slides along the guide rail 406 towards the lower mold 21 with the help of the sliding grooves at both ends until the insertion rod 408 is inserted into the matching insertion holes 409 on both sides of the lower mold 21, thus fixing the lower mold 21. When it is necessary to release the fixation, the motor 405 is reversed, and the bidirectional lead screw 404 drives the sliding plate 407 to slide in the opposite direction, so that the insertion rod 408 is disengaged from the insertion hole 409, and the lower mold 21 can be taken out or moved.

[0033] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A demolding mechanism of an injection mold, comprising a support structure (1), a mold assembly (2), a demolding assembly (3) and a fixing structure (4), characterized in that: The mold assembly (2), demolding assembly (3) and fixing structure (4) are respectively set on the support structure (1). The demolding assembly (3) includes a hydraulic cylinder (301). A fixing frame (302) is fixedly installed at the telescopic end of the hydraulic cylinder (301). The fixing frame (302) is a cross-shaped frame extending outward from the center as the intersection point. A connecting rod (303) is fixedly installed at the bottom of the end of the fixing frame (302). A screw (304) is threadedly installed at the end of the connecting rod (303) away from the fixing frame (302). A turntable (305) is fixedly installed at the end of the screw (304) outside the connecting rod (303). A fixing block (306) is rotatably installed at the end of the screw (304) away from the turntable (305). The two side walls of the fixing block (306) that are close to the screw (304) extend upward to form a baffle.

2. The demolding mechanism of the injection mold according to claim 1, characterized in that: The support structure (1) includes a base plate (11), and support columns (12) are fixedly installed at the four corners of the top of the base plate (11), and a top plate (13) is fixedly installed at the top of the support columns (12).

3. The demolding mechanism of the injection mold according to claim 1, characterized in that: The mold assembly (2) includes an upper mold (22) and a lower mold (21), the upper mold (22) being disposed above the lower mold (21), and the sidewalls of the upper mold (22) extending outward.

4. The demolding mechanism of the injection mold according to claim 2, characterized in that: The hydraulic cylinder (301) is fixedly installed on the outer top of the top plate (13), and the telescopic end of the hydraulic cylinder (301) extends into the bottom of the top plate (13).

5. The demolding mechanism of the injection mold according to claim 3, characterized in that: The fixed structure (4) includes a base (401), a two-way lead screw (404), a motor (405), and a socket (409). The base (401) is fixedly installed on the top of the base plate (11), and a limiting frame (402) adapted to the lower mold (21) is fixedly installed on the top of the base (401).

6. The demolding mechanism of the injection mold according to claim 5, characterized in that: The base (401) has mounting grooves (403) on both sides of its top end. The bidirectional lead screw (404) is rotatably mounted inside the base (401). The threaded end of the bidirectional lead screw (404) is located inside the mounting groove (403). The motor (405) is fixedly mounted on the outer side wall of the base (401), and the motor shaft of the motor (405) is fixedly connected to one end of the bidirectional lead screw (404).

7. The demolding mechanism of the injection mold according to claim 6, characterized in that: Guide rails (406) are fixedly installed on the top of the base (401) and on both sides of the mounting groove (403). A sliding plate (407) is threaded onto the bidirectional lead screw (404). The two ends of the sliding plate (407) are slidably connected to the guide rails (406). A plug rod (408) is symmetrically fixed on the opposite side of the sliding plate (407). The plug hole (409) is located on both sides of the lower mold (21).

Images