An injection mold convenient for demoulding

Abstract

The utility model discloses an injection mold for easy demoulding, including a base and support plates symmetrically installed on both sides of the top of the base, a lower injection mold is installed on the top of the support plate, an upper injection mold is arranged above the lower injection mold, and a feed port is provided at the center of the top of the upper injection mold, a stripping plate is slidably installed between the two support plates, and a plurality of ejection needles penetrating to the outside of the lower injection mold are installed on the top of the stripping plate, and grooves are provided on the front and rear inner walls of the base. The utility model ensures that the workpiece is ejected only after a sufficient cooling time after the mold is opened. At the same time, the design of the swing-type ejection structure can provide a stable ejection force, and can adapt to workpieces of different sizes and shapes, ensuring the smoothness and reliability of the ejection process, and avoiding ejection quality problems caused by incomplete cooling of the workpiece.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molds, in particular to an injection mold which is convenient for demoulding. Background Art

[0002] Injection molds are used to manufacture plastic products. As one of the end cap workpieces, the mold plays a vital role in the manufacturing process. Injection molds are usually composed of mold bases, mold cores, mold cavities, ejectors, ejector mechanisms, cooling systems, etc. The mold base is the supporting structure of the mold, and the mold core and mold cavity are used to form the cavity of the final product. When manufacturing the end cap workpiece, the structural design of the mold core and mold cavity needs to match the shape and size of the workpiece to ensure the quality of the final product. The injection mold is formed by injecting the molten plastic material into the mold cavity and cooling and solidifying it under a certain pressure and temperature to finally form the desired workpiece shape. At this stage, after the plastic of the injection mold is solidified, the mold is opened, and the ejector or other ejector mechanism ejects the finished product from the mold to complete the entire injection molding process. The ejector mechanism used in this process is generally provided by a spring to eject the ejector outward, that is, the mold opening and the workpiece ejection are carried out simultaneously, and the plastic material needs to experience sufficient cooling time to be completely solidified during the injection molding process. If the workpiece is ejected from the mold too early in this process, it may cause unevenness, deformation, cracking and other quality problems on the workpiece surface. Utility Model Content

[0003] The utility model aims to provide an injection mold that is easy to demould, and a belt drive unit, a swing-type ejection structure and a transmission shaft control an ejection needle to eject the workpiece, so as to solve the problems raised in the above background technology.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an injection mold for convenient demolding, comprising a base and support plates symmetrically installed on both sides of the top of the base, a lower injection mold is installed on the top of the support plate, an upper injection mold is arranged above the lower injection mold, and a feed port is provided at the center position of the top of the upper injection mold, a stripping plate is slidably installed between the two support plates, and a plurality of stripping needles pendulum-through to the outside of the lower injection mold are installed on the top of the stripping plate, grooves are provided on the front and rear inner walls of the base, and an H-shaped shaft seat is installed inside the groove, two symmetrical transmission shafts are rotatably installed between the two H-shaped shaft seats, a gear transmission structure is provided at the same end of the two transmission shafts, and both ends of the surface of the transmission shaft are fixed with a swing-type push structure for contacting the bottom end of the stripping plate, and a belt drive unit for driving one of the transmission shafts to rotate is installed on the outer wall of one side of the base.

[0005] Preferably, a U-shaped cooling pipe is installed inside the lower injection mold, and the U-shaped cooling pipe is made of copper.

[0006] Preferably, four ejection needles are provided, and the four ejection needles are symmetrical about the center point of the lower injection mold.

[0007] Preferably, a guide column is fixed at the center position of the bottom end of the stripping plate, and the bottom end of the guide column extends to the inside of the base, and the inside of the base is provided with a countersunk hole for the guide column to slide.

[0008] Preferably, the gear transmission structure is a toothed disc installed on the same end of the two transmission shafts, and the two toothed discs are meshed with each other.

[0009] Preferably, the belt drive unit includes a servo motor mounted on an outer wall of one side of the base, and a crawler drive structure mounted on an output end of the servo motor and used for driving one of the transmission shafts to rotate.

[0010] Preferably, the swing-type pushing structure includes a support arm fixed to one end of the surface of the transmission shaft, and a rectangular cut-out groove arranged at the top of the support arm, and steel wheels are rotatably installed on both side outer walls of the support arm and in the rectangular cut-out groove.

[0011] Compared with the prior art, the beneficial effects of the utility model are as follows: the injection mold with convenient demolding can accurately control the action timing and speed of the ejection mechanism through the belt drive unit, ensuring that the workpiece is ejected only after a sufficient cooling time after the mold is opened; at the same time, the design of the swing-type ejection structure can provide a stable ejection force and can adapt to workpieces of different sizes and shapes, ensuring a smooth and reliable ejection process, avoiding ejection quality problems caused by incomplete cooling of the workpiece, and reducing rework and repair work due to quality problems. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 The three-dimensional structure of the utility model is shown in FIG. Figure 1 ;

[0013] Figure 2 The three-dimensional structure of the utility model is shown in FIG. Figure 2 ;

[0014] Figure 3 It is a side view structural schematic diagram of the utility model;

[0015] Figure 4 The three-dimensional structure of the utility model is shown in FIG. Figure 3 ;

[0016] Figure 5 This is a schematic diagram of the three-dimensional structure of the H-type shaft seat of the utility model;

[0017] In the figure: 1. base; 2. support plate; 3. lower injection mold; 4. upper injection mold; 5. stripper plate; 6. feed port; 7. ejector needle; 8. groove; 9. H-type shaft seat; 10. transmission shaft; 11. gear transmission structure; 12. belt drive unit; 13. swing-type push structure; 1301. support arm; 1302. steel wheel. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0019] See also Figure 1-5 The utility model provides an embodiment: an injection mold for convenient demoulding, comprising a base 1 and support plates 2 symmetrically installed on both sides of the top of the base 1, a lower injection mold 3 is installed on the top of the support plate 2, an upper injection mold 4 is arranged above the lower injection mold 3, and a feed port 6 is opened at the center position of the top of the upper injection mold 4, a stripping plate 5 is slidably installed between the two support plates 2, and a plurality of stripping needles 7 penetrating to the outside of the lower injection mold 3 are installed on the top of the stripping plate 5, and four stripping needles 7 are arranged, and the four stripping needles 7 are symmetrical about the center point of the lower injection mold 3;

[0020] A groove 8 is provided on the front and rear inner walls of the base 1, and an H-shaped shaft seat 9 is installed inside the groove 8. Two symmetrical transmission shafts 10 are rotatably installed between the two H-shaped shaft seats 9. A gear transmission structure 11 is provided at the same end of the two transmission shafts 10. Both ends of the surface of the transmission shaft 10 are fixed with a swing-type push-up structure 13 for contacting the bottom end of the stripping plate 5. A belt drive unit 12 for driving one of the transmission shafts 10 to rotate is installed on the outer wall of one side of the base 1.

[0021] A U-shaped cooling pipe is installed inside the lower injection mold 3. The U-shaped cooling pipe is made of copper. Cold water can be continuously supplied to the U-shaped cooling pipe to achieve the purpose of cooling the workpiece and cooling the molding.

[0022] A guide post is fixed at the center of the bottom end of the stripper plate 5, and the bottom end of the guide post extends to the inside of the base 1. The inside of the base 1 is provided with a countersunk hole for the guide post to slide. The fixing of the guide post and the setting of the countersunk hole can ensure that the stripper plate 5 maintains a stable position and posture during operation;

[0023] The gear transmission structure 11 is a toothed disc installed at the same end of the two transmission shafts 10, and the two toothed discs are meshed with each other. The belt drive unit 12 includes a servo motor installed on the outer wall of one side of the base 1, and a crawler drive structure installed at the output end of the servo motor for driving one of the transmission shafts 10 to rotate. The servo motor and crawler drive structure in the belt drive unit 12 drive the transmission shaft 10 to rotate. At this time, the transmission shaft 10 drives the swing-type ejection structure 13 to move, and then the stripping plate 5 and the ejection needle 7 can be pushed upward, which ensures that the ejection operation is performed after the workpiece is completely solidified, avoiding the deformation of the shape of the workpiece and the generation of quality defects;

[0024] The swing-type pushing structure 13 includes a support arm 1301 fixed on one end of the surface of the transmission shaft 10, and a rectangular cut-out groove arranged at the top of the support arm 1301. Steel wheels 1302 are rotatably installed on the outer walls of both sides of the support arm 1301 and in the rectangular cut-out groove. The support arm 1301 is driven by the transmission shaft 10 to swing. At this time, the steel wheel 1302 will contact the bottom end of the stripping plate 5 and continuously force the stripping plate 5 to move upward during the swinging process of the support arm 1301. In this process, the steel wheel 1302 reduces the contact wear of the support arm 1301 and the stripping plate 5, thereby extending the service life of the injection mold.

[0025] When the embodiment of the present application is in use, the staff first installs the injection mold on the workbench, and the upper injection mold 4 is connected to the external hydraulic cylinder, and the feed port 6 is connected to the discharge port of the screw extruder. When the hydraulic cylinder controls the upper injection mold 4 to move downward and close the lower injection mold 3, the screw extruder feeds the material, so that the molten plastic material enters the mold cavity between the upper injection mold 4 and the lower injection mold 3 through the feed port 6 to form the end cover workpiece. During this process, a certain amount of time is required to maintain a certain pressure to ensure that the plastic material fully fills the mold cavity and reduces the generation of bubbles. Once the plastic material fills the mold cavity, the cooling pipe in the lower injection mold 3 begins to continuously supply cold water to achieve the purpose of cooling the workpiece and cooling and molding. When the plastic is solidified, the hydraulic The cylinder drives the upper injection mold 4 upward, while the molded workpiece is still stranded at the top of the lower injection mold 3. At this time, the staff turns on the belt drive unit 12 to work, and the rotary power of the belt drive unit 12 is transmitted to one of the transmission shafts 10. The two transmission shafts 10 rotate synchronously and in opposite directions under the power connection of the gear transmission structure 11, and then the two swing-type push structures 13 can swing toward each other until the swing-type push structure 13 pushes the stripping plate 5 and the ejection needle 7 upward, so that the ejection needle 7 ejects the molded end cover workpiece at the top of the lower injection mold 3, and then the workpiece and the lower mold are separated. The injection mold can accurately control the timing and speed of the ejection mechanism through the belt drive unit 12 to ensure that the workpiece is ejected only after sufficient cooling time after the mold is opened. At the same time, the design of the swing-type push structure 13 can provide stable ejection force and can adapt to workpieces of different sizes and shapes, ensuring the smoothness and reliability of the ejection process, avoiding ejection quality problems caused by incomplete cooling of the workpiece, and reducing rework and repair work due to quality problems.

[0026] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. An injection mold that is easy to demould, characterized in that: The invention comprises a base (1) and support plates (2) symmetrically installed on both sides of the top of the base (1); a lower injection mold (3) is installed on the top of the support plate (2); an upper injection mold (4) is arranged above the lower injection mold (3); a feed port (6) is provided at the center position of the top of the upper injection mold (4); a stripper plate (5) is slidably installed between the two support plates (2); and a plurality of stripper needles (7) penetrating to the outside of the lower injection mold (3) are installed on the top of the stripper plate (5); and the front and rear inner walls of the base (1) are provided with a plurality of stripper needles (7) penetrating to the outside of the lower injection mold (3). A groove (8) is provided, and an H-shaped shaft seat (9) is installed inside the groove (8), two symmetrical transmission shafts (10) are rotatably installed between the two H-shaped shaft seats (9), a gear transmission structure (11) is provided at the same end of the two transmission shafts (10), and both ends of the surface of the transmission shaft (10) are fixed with a swing-type push-up structure (13) for contacting the bottom end of the stripping plate (5), and a belt drive unit (12) for driving one of the transmission shafts (10) to rotate is installed on the outer wall of one side of the base (1).

2. The injection mold for easy demoulding according to claim 1, characterized in that: A U-shaped cooling pipe is installed inside the lower injection mold (3), and the U-shaped cooling pipe is made of a component made of red copper.

3. The injection mold for easy demoulding according to claim 1, characterized in that: Four ejection needles (7) are provided, and the four ejection needles (7) are symmetrical with respect to the center point of the lower injection mold (3).

4. The injection mold for easy demoulding according to claim 1, characterized in that: A guide column is fixed at the center position of the bottom end of the stripping plate (5), and the bottom end of the guide column extends to the inside of the base (1). The inside of the base (1) is provided with a countersunk hole for the guide column to slide.

5. The injection mold for easy demoulding according to claim 1, characterized in that: The gear transmission structure (11) is a toothed disc installed at the same end of the two transmission shafts (10), and the two toothed discs are meshed with each other.

6. The injection mold for easy demoulding according to claim 1, characterized in that: The belt drive unit (12) comprises a servo motor mounted on an outer wall of one side of the base (1), and a crawler drive structure mounted on the output end of the servo motor and used for driving one of the transmission shafts (10) to rotate.

7. The injection mold for easy demoulding according to claim 1, characterized in that: The swing-type pushing structure (13) comprises a support arm (1301) fixed to one end of the surface of the transmission shaft (10), and a rectangular cut-out groove arranged at the top of the support arm (1301), and steel wheels (1302) are rotatably installed on both side outer walls of the support arm (1301) and in the rectangular cut-out groove.

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