Injection mold capable of automatically removing waste materials

Abstract

The utility model discloses an automatic waste stripping injection mold, which belongs to the technical field of injection molds, a fixed mold part of the automatic waste stripping injection mold comprises an upper mold plate, a runner plate and a sprue bush arranged in the upper mold plate, a pin-point gate taper hole is arranged in the runner plate, and waste is formed in the sprue bush taper hole, the pin-point gate taper hole and a runner. A waste pull rod and a waste push-out device are arranged in the upper template; the end of the waste pull rod extends into a pin-point gate taper hole, the waste push-out device comprises a compression spring and a push-out pin which are installed in an installation hole formed in the upper die plate, one end of the compression spring is fixed, the other end of the compression spring abuts against the head of the push-out pin, and the bottom of the push-out pin abuts against the upper portion of a runner of the runner plate. According to the utility model, the waste material pull rod and the waste material push-out device are matched to realize automatic dropping of the waste material, manual operation is not needed, the labor intensity is greatly reduced, the automatic dropping of the waste material can be completed by opening the fixed die part for one time, the production efficiency is high, and the service life of the die is long.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molding dies, in particular to an automatic waste removing injection mold. Background Art

[0002] Injection molding, also known as injection molding, is a method of completely melting plastic materials through screw agitation at a certain temperature, injecting them into a mold cavity under high pressure, and obtaining molded products after cooling and solidification. It is suitable for mass production of complex-shaped parts and is one of the important processing methods. After injection molding, the waste material and the plastic part of the injection mold are still connected together. There is a existing three-plate mold that uses the demolding force when the cavity plate and the core plate are separated to break the pin gate between the waste material and the product. After being broken, the product is ejected by the ejector pin and falls into the collection box, while the waste material remains in the pin gate cone hole and needs to be manually removed, which has a high labor intensity and potential safety hazards. If the waste material is not removed due to momentary negligence, it will affect the next injection molding and even damage the mold.

[0003] In view of the above problems, Chinese Patent No. CN202764149U discloses a pull rod for breaking multiple pin gates of an injection mold, including a top plate, a sprue plate, and a cavity connected in sequence. There is waste material between the cavity and the sprue plate. A first fixed-distance pull pin is provided between the sprue plate and the cavity, and a waste material pull plate is provided between the sprue plate and the cavity. A second fixed-distance pull pin is provided between the waste material pull plate and the cavity. A waste material pull rod is installed under the sprue plate, and a waste material catching ball is made at the lower end of the waste material pull rod. The waste material catching ball passes through the waste material pull plate and cooperates with the waste material. When the mold is opened, first, the cavity is separated from the waste material pull plate. Under the action of the waste material pull rod and the waste material catching ball, the waste material is pulled and broken from the product, and the first mold opening is completed. Then, under the action of the second fixed-distance pull pin, the waste material pull plate is separated from the sprue plate, and the waste material pull plate pushes the waste material away from the waste material pull rod, and the waste material automatically falls off the mold due to the loss of tension, and the second mold opening is completed. Finally, under the action of the first fixed-distance pull pin, the core is separated from the cavity to achieve the third mold opening and eject the product. This solution can realize automatic demolding of the gate waste material, reduce the labor intensity, and improve the production efficiency. However, this solution requires two mold opening actions in the fixed mold part to complete the automatic shedding of the waste material, which increases the number of mold openings, makes the mold action more complex, is more likely to cause mold wear, and has lower efficiency. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is to overcome the above problems, and provide an automatic waste removing injection mold, which does not require manual operation, reduces the labor intensity, and only needs one mold opening in the fixed mold part to complete the automatic shedding of the waste material, with high production efficiency and long service life.

[0005] The technical solution of the utility model is as follows:

[0006] An automatic waste removing injection mold, comprising a fixed mold part, a movable mold part and a guide pillar assembly. The fixed mold part includes an upper template, a runner plate and a sprue bushing arranged in the upper template. A pin-point gate tapered hole is provided in the runner plate, and a runner is arranged on the end face of the runner plate that fits with the upper template. The runner communicates with the sprue bushing tapered hole and the pin-point gate tapered hole. Waste is formed in the sprue bushing tapered hole, the pin-point gate tapered hole and the runner. The fixed mold part and the movable mold part are sequentially stacked and positioned through the guide pillar assembly. It is characterized in that: a waste pull rod and a waste pushing device are provided in the upper template; one end of the waste pull rod is fixedly connected to the upper template, and the end of the other end extends into the pin-point gate tapered hole of the runner plate; the waste pushing device includes a compression spring and a push pin. An installation hole is opened in the upper template, and the compression spring and the push pin are installed in the installation hole. One end of the compression spring is fixed, and the other end abuts against the head of the push pin. The bottom of the push pin presses against the runner of the runner plate. When the fixed mold part of the mold is opened from the runner plate and the upper template, the waste pull rod pulls the waste, breaks the waste from the product, and pulls it out from the pin-point gate tapered hole. The waste clings to the lower surface of the upper template. Then, the push pin of the waste pushing device pushes the waste under the restoring force of the compression spring, so that the waste is separated from the waste pull rod and the sprue bushing tapered hole and automatically falls off from the mold.

[0007] As an optimization, in the above automatic waste removing injection mold, the end of the waste pull rod extending into the pin-point gate tapered hole is a spherical structure or an inverted tapered structure. The spherical structure and the inverted tapered structure can hook the waste, ensure that the waste is broken from the product, and pulled out from the pin-point gate tapered hole.

[0008] Furthermore, in the above automatic waste removing injection mold, a limit bayonet is provided at a section of the installation hole close to the runner plate, for limiting the position of the head of the push pin to prevent the push pin from being pushed out of the installation hole.

[0009] As an optimization, in the above automatic waste removing injection mold, a limit insert sleeve is provided at a section of the installation hole close to the runner plate, and the limit bayonet is arranged in the limit insert sleeve. The push pin often rubs and collides with the limit bayonet, resulting in mold wear. Therefore, the provision of a replaceable limit insert sleeve can reduce the maintenance cost of the mold.

[0010] As an optimization, in the above automatic waste removing injection mold, a guide rod is provided on the head of the push pin, and the guide rod is inserted into the inner ring of the compression spring. The provision of the guide rod can make the spring structure more stable and reliable.

[0011] As an optimization, in the above-mentioned automatic waste removal injection mold, the waste ejection device also includes an adjusting screw, which is threadedly connected in the mounting hole, and one end of the compression spring away from the ejection pin abuts against the bottom of the adjusting screw. The preload force of the compression spring can be adjusted by screwing the adjusting screw in and out, that is, the thrust of the waste ejection device can be adjusted to adapt to different working conditions.

[0012] Furthermore, in the above-mentioned automatic waste removal injection mold, each point gate cone hole is correspondingly configured with a waste pull rod, and each injection mold is configured with 2-4 waste ejection devices.

[0013] As an optimization, in the above-mentioned automatic waste removal injection mold, a point gate insert sleeve is provided in the runner plate, and the point gate cone hole is arranged in the point gate insert sleeve. Providing a replaceable point gate insert sleeve can reduce the maintenance cost of the mold.

[0014] The beneficial effects of the utility model are:

[0015] 1. A waste pull rod and a waste ejection device are set. When the fixed mold is opened, the waste pull rod pulls the waste out of the taper hole of the point gate, and then the waste ejection device separates the waste pull rod and the taper hole of the gate sleeve, so that the waste automatically falls off from the mold. No manual operation is required, which greatly reduces the labor intensity. In addition, the fixed mold only needs to be opened once to complete the automatic shedding of the waste, which has high production efficiency, simple mold movement, less wear and tear, and long service life.

[0016] 2. An adjusting screw is provided in the waste ejection device to adjust the thrust to adapt to different working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of an embodiment of the utility model.

[0018] Figure 2 for Figure 1 Enlarged view of P.

[0019] Figure 3 This is a schematic diagram of the state of waste being pulled out according to an embodiment of the utility model.

[0020] Figure 4 It is a schematic diagram of the state when waste falls off according to an embodiment of the utility model.

[0021] In the figure: 1. Moving mold part; 21. Guide pillar; 22. Guide bushing; 31. Upper template; 32. Runner plate; 33. Locating ring; 34. Sprue; 35. Sprue bushing; 36. Sprue bushing taper hole; 37. Pinpoint gate taper hole; 38. Runner; 39. Mounting hole; 391. Limit bayonet; 4. Scrap; 5. Scrap pull rod; 6. Scrap ejection device; 61. Compression spring; 62. Ejection pin; 63. Adjusting screw; 64. Guide rod; 7. Limit insert; 8. Pinpoint gate insert. Detailed implementation mode

[0022] The present utility model will be further described below in conjunction with the accompanying drawings and embodiments:

[0023] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "upper", "lower", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present utility model, rather than indicating or implying that the device or component referred to must have a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

[0024] As Figure 1 shown, an automatic scrap-removing injection mold provided in this embodiment includes a fixed mold part, a moving mold part 1, and a guide pillar assembly. The guide pillar assembly includes a guide pillar 21 and a guide bushing 22. The fixed mold part and the moving mold part 1 are sequentially stacked and positioned through the guide pillar 21 and the guide bushing 22. The guide pillar 21 plays a guiding role during mold opening and closing.

[0025] The fixed mold part includes an upper template 31 and a runner plate 32. A locating ring 33 is arranged at the upper end of the upper template 31, a sprue 34 is arranged in the middle of the upper template 31, a sprue bushing 35 is arranged in the sprue 34, and a sprue bushing taper hole 36 is formed at the lower end of the sprue bushing 35. The runner plate 32 is arranged below the upper template 31. A pinpoint gate taper hole 37 is arranged in the runner plate 32. The upper end surface of the runner plate 32 is attached to the upper template 31, and a runner 38 is arranged on the upper end surface. The runner 38 communicates with the sprue bushing taper hole 36 and the pinpoint gate taper hole 37. Scrap 4 is formed in the sprue bushing taper hole 36, the pinpoint gate taper hole 37, and the runner 38. As Figure 2 shown, a pinpoint gate insert 8 is arranged in the runner plate 32, and the pinpoint gate taper hole 37 is arranged in the pinpoint gate insert 8.

[0026] As Figure 1 shown, in order to achieve the function of automatic scrap removal, a scrap pull rod 5 and a scrap ejection device 6 are arranged in the upper template 31. The upper end of the scrap pull rod 5 is fixedly connected in the upper template 31, and the end of the lower end extends into the pinpoint gate taper hole 37 of the runner plate 32. This end is a spherical structure or an inverted conical structure, which is convenient for hooking the scrap 4 to pull it out of the pinpoint gate taper hole 37. In this embodiment, this end of the scrap pull rod 5 is a spherical structure. As Figure 2As shown, the waste material ejection device 6 includes a compression spring 61, an ejection pin 62, and an adjusting screw 63. An installation hole 39 for installing the waste material ejection device 6 is provided in the upper template 31. The installation hole 39 penetrates through the upper template 31. The adjusting screw 63, the compression spring 61, and the ejection pin 62 are sequentially installed in the installation hole 39 from top to bottom. The adjusting screw 63 is threadedly connected in the installation hole 39. The upper end of the compression spring 61 abuts against the bottom of the adjusting screw 63 and is fixed relative to the upper template 31. The lower end of the compression spring 61 abuts against the head of the ejection pin 62. A guide rod 64 is provided on the head of the ejection pin 62. The guide rod 64 is inserted into the inner ring of the compression spring 61. The bottom of the ejection pin 62 presses against the upper end surface of the runner plate 32, above the runner 38. The diameter of the bottom of the ejection pin 62 is larger than the width of the runner 38. Therefore, the ejection pin 62 will not extend into the runner 38 to affect the casting process. A limit bayonet 391 is provided at a section of the installation hole 39 close to the runner plate 32. The aperture of the limit bayonet 391 is smaller than the diameter of the head of the ejection pin 62. After the ejection pin 62 ejects the waste material 4, the limit bayonet 391 can limit the position of the head of the ejection pin 62 to prevent the ejection pin 62 from being ejected out of the installation hole. A limit insert sleeve 7 is provided at a section of the installation hole 39 close to the runner plate 32. The above-mentioned limit bayonet 391 is arranged in the limit insert sleeve 7.

[0027] In the injection mold, each sprue cone hole 37 is correspondingly provided with a waste material pull rod 5, and each injection mold is provided with 2 - 4 waste material ejection devices 6.

[0028] The working process of the present utility model is as follows: As Figure 3 shown, when the injection molding is completed, the waste material 4 is formed in the sprue bushing cone hole 36, the sprue cone hole 37, and the runner 38. When the fixed mold part of the mold is opened at point A, that is, at the runner plate 32 and the upper template 31, the spherical structure end of the waste material pull rod 5 hooks the waste material 4, breaks the waste material 4 from the product, and pulls it out from the sprue cone hole 37. The waste material 4 clings to the lower surface of the upper template 31. Then, as Figure 4 shown, the ejection pin 62 of the waste material ejection device 6 pushes the waste material 4 under the restoring force of the compression spring 61, unloads the waste material 4 from the spherical structure end of the waste material pull rod 5, and at the same time disengages from the sprue bushing cone hole 36. After the waste material 4 loses force, it automatically falls off from the mold.

[0029] In order to adapt to different working conditions and ensure that the waste material ejection device 6 can eject the waste material 4 with an appropriate force, the pre-tightening force of the compression spring 61 can be adjusted by screwing in and out the adjusting screw 62, thereby adjusting the thrust of the waste material ejection device 6.

[0030] Finally, it can be understood that for those of ordinary skill in the art, various corresponding changes and deformations can be made according to the technical concept of the present utility model, and all these changes and deformations should fall within the protection scope of the claims of the present utility model.

Claims

1. An automatic waste removal injection mold, comprising a fixed mold part, a movable mold part and a guide column assembly, wherein the fixed mold part comprises an upper mold plate, a runner plate and a gate sleeve arranged in the upper mold plate, wherein a point gate taper hole is arranged in the runner plate, and a runner is arranged on the end surface of the runner plate that is in contact with the upper mold plate, wherein the runner connects the gate sleeve taper hole and the point gate taper hole, and waste is formed in the gate sleeve taper hole, the point gate taper hole and the runner, wherein the fixed mold part and the movable mold part are sequentially overlapped and positioned by the guide column assembly, and wherein: The upper template is provided with a waste pull rod and a waste pushing device; One end of the waste pull rod is fixedly connected to the upper mold plate, and the other end thereof extends into the point gate cone hole of the runner plate; The waste ejection device includes a compression spring and an ejection pin. A mounting hole is opened in the upper template. The compression spring and the ejection pin are installed in the mounting hole. One end of the compression spring is fixed, and the other end abuts against the head of the ejection pin. The bottom of the ejection pin presses above the flow channel of the flow channel plate.

2. The automatic waste removal injection mold according to claim 1, characterized in that: The end of the waste pull rod extending into the taper hole of the point gate is a spherical structure or an inverted cone structure.

3. The automatic waste removal injection mold according to claim 1, characterized in that: The mounting hole is provided with a limit snap-in at a section close to the flow channel plate, which is used to limit the position of the ejection pin head to prevent the ejection pin from being ejected out of the mounting hole.

4. The automatic waste removal injection mold according to claim 3 is characterized in that: The mounting hole is provided with a limiting sleeve in a section close to the flow channel plate, and the limiting bayonet is arranged in the limiting sleeve.

5. The automatic waste removal injection mold according to claim 1 or 3, characterized in that: A guide rod is arranged on the head of the ejection pin, and the guide rod is penetrated through the inner ring of the compression spring.

6. The automatic waste removal injection mold according to claim 1 or 3, characterized in that: The waste ejection device also includes an adjusting screw, which is threadedly connected in the mounting hole, and one end of the compression spring away from the ejection pin abuts against the bottom of the adjusting screw.

7. The automatic waste removal injection mold according to claim 1, characterized in that: Each point gate cone hole is equipped with a waste pull rod, and each injection mold is equipped with 2-4 waste ejection devices.

8. The automatic waste removal injection mold according to claim 1, characterized in that: A point gate insert sleeve is arranged in the runner plate, and a point gate taper hole is arranged in the point gate insert sleeve.

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