Material head snapping mechanism

Abstract

The invention provides a stub bar snapping mechanism which comprises a stub bar ejector pin plate arranged on an upper ejector pin plate, a connecting assembly arranged between the stub bar ejector pin plate and a lower fixing plate, a stub bar ejector pin arranged on the stub bar ejector pin plate, and a first movement height of the stub bar ejector pin plate, the pull pin is fixed on the outer side of the stub bar ejector pin plate; the pull rod is arranged on the same side of the mold and the pull pin, one end of the pull rod is rotationally connected with the female mold plate, the other end of the pull rod is provided with a pull hook, the pull hook is used for hooking the pull pin, and a guide groove is formed in one side, close to the mold, of the pull rod; the shifting pin is arranged on one side, close to the pull rod, of the mold, one end of the shifting pin is fixed to the male mold plate, and the other end of the shifting pin is slidably arranged in the guide groove and used for being matched with the guide groove to shift the pull rod to rotate, so that the pull hook is separated from the pull pin. The material head and the product can be snapped before the product is ejected out, and then the material head and the product are ejected out together in the product ejection process, so that the product is prevented from being concavely pulled, and the cost is saved.

Description

[Technical Field]

[0001] This invention relates to the field of mold mechanism technology, and in particular to a material head breaking mechanism. [Background Technology]

[0002] Thinness and lightness are the mainstream trends in the development of electronic products, and users are also demanding that laptop casings be thinner and lighter. Figure 1 The illustration depicts a product and a sprue. Product 10 is a laptop screen bezel with a wall thickness of only 0.8mm. Product 10 is molded in a mold using a multi-point horn-shaped injection molding process. When product 10 is ejected after molding, product 10 and sprue 11 are usually ejected simultaneously. However, this makes it easy for sprue 11 to dent product 10 when it breaks off from product 10, resulting in poor appearance. If sprue 11 is ejected first, it will be positioned above product 10. If the distance between sprue 11 and product 10 is too small, sprue 11 is prone to rebounding and damaging product 10. If the distance between sprue 11 and product 10 is too large, the ejection stroke will increase, thereby increasing the mold thickness and tonnage, and increasing the cost of both the mold and the product.

[0003] In view of this, the present invention provides a material head breaking mechanism to solve the above problems. [Summary of the Invention]

[0004] The technical problem this invention aims to solve is: when thin-walled products separate from the die after molding, the die easily breaks off during ejection, causing damage to the product. Ejecting the die first places it above the product; if the distance between the die and product is too small, the die rebounds and damages the product; if the distance is too large, it increases the ejection stroke, mold tonnage, and mold costs. This invention provides a die-breaking mechanism to solve these problems.

[0005] The solution to the technical problem of this invention is: a material head breakage mechanism, applied in an injection mold, wherein the mold includes a female mold plate, a male mold plate, a male mold core, an upper ejector plate, a lower ejector plate, a product ejector pin, and a lower fixing plate, wherein the product ejector pin is disposed between the upper ejector plate and the lower ejector plate for ejecting the product, and the material head breakage mechanism includes:

[0006] A material head ejector plate is provided on the side of the upper ejector plate near the male mold plate. The material head ejector plate is provided with a connecting component. The end of the connecting component away from the material head ejector plate passes through the upper ejector plate and the lower ejector plate and is inserted into the lower fixed plate for positioning the material head ejector plate. The material head ejector plate is provided with a material head ejector pin. The depth of the material head ejector pin sinking into the male mold is greater than the first movement height of the material head ejector plate.

[0007] Pull pin, the pull pin being fixed to the outside of the feed head ejector plate;

[0008] A pull rod is provided on the mold and on the same side as the pull pin. One end of the pull rod is rotatably connected to the female mold plate, and the other end extends toward the male mold plate and has a pull hook. The pull hook is used to engage with the pull pin, and there is a clearance distance between the pull hook and the pull pin when the mold is closed. The pull rod is provided with a guide groove on the side near the mold.

[0009] A pin is provided on the side near the pull rod. One end of the pin is fixed to the male template, and the other end is slidably disposed in the guide groove. After the mold is opened, the pin cooperates with the guide groove to rotate the pull rod, so that the pull rod hook disengages from the pin.

[0010] Preferably, a first return pin is provided between the upper ejector plate and the male mold plate. The first return pin passes through an elastic element and is then inserted into the material head ejector plate. One end of the elastic element is housed in the male mold plate, and the other end, away from the male mold plate, passes through the material head ejector plate and abuts against the upper ejector plate. This is used to assist in resetting the upper ejector plate and the lower ejector plate during mold closing.

[0011] Preferably, the ejector plate of the material head is provided with a second return pin. The end of the second return pin away from the ejector plate of the material head passes through the male mold plate and is flush with the side of the male mold plate that is close to the female mold plate when the mold is closed. The second return pin is pushed by the female mold plate when the mold is closed, thereby resetting the ejector plate of the material head.

[0012] Preferably, the pull rod is rotatably connected to the female template via a fixing pin. The female template is also provided with a limiting pin, which is located on the side of the fixing pin near the male template. The pull rod is provided with a limiting hole corresponding to the position of the limiting pin. The limiting hole is an oblong hole perpendicular to the mold opening direction. The limiting pin passes through the limiting hole and is used to limit the pull rod during rotation.

[0013] Preferably, the template is further provided with a protective plate, which surrounds the outside of the tie rod.

[0014] Preferably, the connecting assembly includes a connecting rod and an elastic element. One end of the connecting rod is fixed to the ejector plate of the material head, and the elastic element is fixed to the end of the connecting rod away from the ejector plate of the material head. The elastic element is inserted into the connecting hole in the lower fixed plate and is interference-fitted with the connecting hole, for positioning the ejector plate of the material head during the mold opening process.

[0015] Preferably, the ejector pin includes a first ejector pin and a second ejector pin. The first ejector pin and the second ejector pin are inserted through the male mold plate and the male mold core and are located below the flow channel. The first ejector pin is closer to the product than the second ejector pin. The distance between the ejector end of the first ejector pin and the flow channel is less than the distance between the ejector end of the second ejector pin and the flow channel.

[0016] Preferably, the track groove has a first part, a second part, and a third part. The first part and the third part are arranged in parallel and parallel to the mold opening direction. The first part cooperates with the clearance distance to prevent the pull rod from rotating in the initial stage of mold opening and to prevent the pull rod from getting stuck. The second part is an inclined groove that is inclined towards the pull hook. The end of the third part away from the second part also has a guide slope to guide the pin to slide into the track groove when the mold is closed.

[0017] The beneficial effects of the present invention are that the material head breaking mechanism of the present invention can first push out a part of the material head in the flow channel before the product ejector pin of the mold opens and break the material head at the injection point from the product, so that the material head is separated from the product but does not eject from the mold core. Then, during the ejection process of the product ejector pin, the material head and the product are ejected together, avoiding the defective situation of product concavity. Moreover, the mechanism is simple and saves mold costs. [Attached Image Description]

[0018] Figure 1 This is a schematic diagram of a product and its raw materials.

[0019] Figure 2 This is a schematic diagram of the first angle of the material head breaking mechanism of the present invention in the mold closing state.

[0020] Figure 3 This is a schematic diagram of the material head breaking mechanism of the present invention at the first angle (without tie rod and protective plate) in the mold closing state.

[0021] Figure 4 This is a schematic diagram of the material head breaking mechanism of the present invention at the second angle in the mold closing state.

[0022] Figure 5 yes Figure 4 Schematic diagram of surface AA in the middle.

[0023] Figure 6 yes Figure 4 Schematic diagram of the middle BB surface.

[0024] Figure 7 yes Figure 6 Enlarged diagram of point A in the middle.

[0025] Figure 8This is a schematic diagram of the tie rod structure in a material head breaking mechanism of the present invention.

Detailed Implementation Methods

[0026] To further illustrate the technical means and effects of the present invention, the following detailed description is provided in conjunction with the embodiments of the present invention and their accompanying drawings.

[0027] This invention provides a material head breakage mechanism for use in injection molds. The mold includes a female mold plate 20, a male mold plate 21, a male mold core 210, an upper ejector plate 22, a lower ejector plate 23, a product ejector pin (not shown in the figure), and a lower fixing plate 24. The product ejector pin is disposed between the upper ejector plate 22 and the lower ejector plate 23 for ejecting the product 10. The material head breakage mechanism includes:

[0028] The ejector plate 3 is located on the side of the upper ejector plate 22 near the male mold plate 21. The ejector plate 3 is provided with a connecting rod assembly. The end of the connecting assembly away from the ejector plate 3 passes through the upper ejector plate 22 and the lower ejector plate 23 and is inserted into the lower fixing plate 24 for positioning the ejector plate 3. The ejector plate 3 is provided with ejector pins. The depth of the ejector pins sinking into the male mold is greater than the height of the first ejection movement of the ejector plate 3.

[0029] Pull pin 4, the pull pin 4 is fixed to the outside of the feed head ejector plate 3;

[0030] A pull rod 5 is provided on the mold and on the same side as the pull pin 4. One end of the pull rod 5 is rotatably connected to the female template 20, and the other end extends toward the male template 21 and has a pull hook 50. The pull hook 50 is used to engage with the pull pin 4, and there is a clearance distance between the pull hook 50 and the pull pin 4 when the mold is closed. The pull rod 5 is provided with a guide groove 51 on the side near the mold.

[0031] The pin 6 is located on the side near the pull rod 5. One end of the pin is fixed to the template 21, and the other end is slidably located in the guide groove 51. After the mold is opened, the pin 6 cooperates with the guide groove 51 to rotate the pull rod 5, so that the pull rod hook 50 disengages from the pin 4.

[0032] A first return pin 7 is provided between the upper ejector plate 22 and the male template 21. The first return pin 7 passes through an elastic element 70 and is then inserted into the material head ejector plate 3. One end of the elastic element 70 is accommodated in the male template 21, and the other end away from the male template 21 passes through the material head ejector plate 3 and abuts against the side of the upper ejector plate 22 near the material head ejector plate 3. This is used to assist in resetting the upper ejector plate 22 and the lower ejector plate 23 when the mold is closed.

[0033] The ejector plate 3 is provided with a second return pin 8. The end of the second return pin 8 away from the ejector plate 3 passes through the male template 21 and is flush with the side of the male template 21 that is close to the female template 20 when the mold is closed. The second return pin 8 is broken by the female template 20 when the mold is closed, thereby resetting the ejector plate 3.

[0034] The pull rod 5 is rotatably connected to the female template 20 via a fixing pin 200. The female template 20 is also provided with a limiting pin 201. The limiting pin 201 is located on the side of the fixing pin 200 near the male template 21. The pull rod 5 is provided with a limiting hole 52 corresponding to the position of the limiting pin 201. The limiting hole 52 is an oblong hole perpendicular to the mold opening direction. The limiting pin 201 passes through the limiting hole 52 and is used to limit the pull rod 5 during the rotation of the pull rod 5.

[0035] The template 21 is also provided with a protective plate 211, which surrounds the outside of the tie rod 5.

[0036] The connecting assembly includes a connecting rod 30 and an elastic element 300. One end of the connecting rod 30 is fixed to the ejector plate 3, and the elastic element 300 is fixed to the end of the connecting rod 30 away from the ejector plate 3. The elastic element 300 is inserted into the connecting hole 240 in the lower fixed plate 24 and is interference-fitted with the connecting hole 240 to position the ejector plate 3 during the mold opening process.

[0037] The elastic element 300 is a rubber opener / closer.

[0038] The ejector pins include a first ejector pin 31 and a second ejector pin 32. The first ejector pin 31 and the second ejector pin 32 are inserted through the male mold plate 21 and the male mold core 210 and are located below the runner 12. The first ejector pin 31 is closer to the product than the second ejector pin 32. The distance between the ejector end of the first ejector pin 31 and the runner 12 is less than the distance between the ejector end of the second ejector pin 32 and the runner 12. This is to prevent the ejector pin 11 in the runner 12 from detaching from the male mold core 210 during the process of the ejector pin 11 breaking off from the product 10.

[0039] The track groove 51 has a first part 510, a second part 511, and a third part 512. The first part 510 and the third part 512 are arranged in parallel and parallel to the mold opening direction. The first part 510 cooperates with the clearance distance to prevent the pull rod 5 from rotating in the initial stage of mold opening and to prevent the pull rod 5 from getting stuck. The second part 511 is an inclined groove that is inclined towards the pull hook 50. The end of the third part 512 away from the second part 511 also has a guide slope to guide the pin 4 to slide into the track groove 51 when the mold is closed.

[0040] The working process of this invention is as follows: After the product is formed, the female template 20 and the male template 21 gradually open the mold. The pull rod 5 moves away from the male template 21 along with the female template 20. The pin 6 slides in the track groove 51 of the pull rod 5. When the pin 6 slides in the first part 510 of the track groove, the pull rod 5 does not rotate. The pull rod hook 50 gradually moves towards the pull pin 4. When the pin 6 has slid through the first part 510, the pull rod hook 50 has traveled the clearance distance between itself and the pull pin 4 and is tightly engaged with the pull pin 4. At this time, the mold has opened for a certain period of time.

[0041] The mold continues to open between the female mold plate 20 and the male mold plate 21. The push pin 6 slides in the second part 511 of the track groove and pushes the pull rod 5 to gradually rotate away from the pull pin 4, so that the pull hook 50 gradually disengages from the pull pin 4. During this process, the material head ejector plate 3 is driven by the pull rod 5 to make a first ejection movement towards the male mold plate 21. The first material head ejector pin 31 and the second material head ejector pin 32 make ejection movements. When the push pin 6 has slid through the second part 511 of the track groove, the pull rod hook 50 is completely disengaged from the pull pin 4, and the material head ejector plate 3 no longer pushes. At this point, the first ejector pin 31 has ejected the sprue 11 in the flow channel 12 at its corresponding position out of the mold core 210, while the sprue 11 in the flow channel 12 at the corresponding position of the second ejector pin 32 has not been completely ejected out of the mold core 210. The sprue 11 at the injection point is deformed by force and moves backward along the flow channel 12 away from the product 10. After being pulled apart from the product 10, it remains in the mold core 210. The ejector pin plate 3 remains stationary under the cooperation of the elastic element 300 and the lower fixed plate connection hole 240, preventing the ejector pin plate 3 from completely ejecting the sprue 11 out of the mold core 210 due to inertia.

[0042] After the mold is fully opened, the upper ejector plate 22 and the lower ejector plate 23 drive the product ejector pins to eject. When the upper ejector plate 22 contacts the material head ejector plate 3, the upper ejector plate 22 and the lower ejector plate 23 continue to drive the material head ejector plate 3, the first material head ejector pin 31, and the second material head ejector pin 32 to eject until the product 10 and the material head 11 are ejected simultaneously. Then, the product 10, which has separated from the material head 11, can be taken out. When the mold is closed, the upper ejector plate 22 and the lower ejector plate 23 are reset with the assistance of the restoring force of the elastic element 70 of the first return pin 7. The female mold plate 20 presses the second return pin 8 that extends from the male mold plate 21 and drives the material head ejector plate 3 to reset. The pull rod 5 is moved by the push pin 6 to re-engage with the pull pin 4. After the mold is fully closed, the next injection molding begins.

[0043] The beneficial effects of the present invention are that the material head breaking mechanism of the present invention can first push out a part of the material head 11 in the flow channel 12 before the product ejector pin of the mold opens and break the material head 11 at the injection point from the product 10, so that the material head 11 is separated from the product 10 but does not eject from the mold core. Then, during the ejection process of the product ejector pin, the material head 11 and the product 10 are ejected together, avoiding the undesirable situation of pulling the product 10 into a concave shape. Moreover, the mechanism is simple and saves mold costs.

[0044] It should be noted that the present invention is not limited to the above embodiments. Any simple modifications, equivalent changes and alterations made by those skilled in the art to the above embodiments based on the technical solutions of the present invention shall fall within the protection scope of the present invention.

Claims

1. A material head breakage mechanism, applied in an injection mold, the mold comprising a female mold plate, a male mold plate, a male mold core, an upper ejector plate, a lower ejector plate, a product ejector pin, and a lower fixing plate, characterized in that, The material head breaking mechanism includes: A material head ejector plate is provided on the side of the upper ejector plate near the male mold plate. The material head ejector plate is provided with a connecting component. The end of the connecting component away from the material head ejector plate passes through the upper ejector plate and the lower ejector plate and is inserted into the lower fixed plate for positioning the material head ejector plate. The material head ejector plate is provided with a material head ejector pin. The depth of the material head ejector pin sinking into the male mold is greater than the first movement height of the material head ejector plate. Pull pin, the pull pin being fixed to the outside of the feed head ejector plate; A pull rod is provided on the mold and on the same side as the pull pin. One end of the pull rod is rotatably connected to the female mold plate, and the other end extends toward the male mold plate and has a pull hook. The pull hook is used to engage with the pull pin, and there is a clearance distance between the pull hook and the pull pin when the mold is closed. The pull rod is provided with a guide groove on the side near the mold. A pin is provided on the side near the pull rod. One end of the pin is fixed to the male template, and the other end is slidably disposed in the guide groove. After the mold is opened, the pin cooperates with the guide groove to rotate the pull rod, so that the pull rod hook disengages from the pin.

2. The material head breaking mechanism as described in claim 1, characterized in that: A first return pin is provided between the upper ejector plate and the male mold plate. The first return pin passes through an elastic element and is then inserted into the material head ejector plate. One end of the elastic element is housed in the male mold plate, and the other end, away from the male mold plate, passes through the material head ejector plate and abuts against the side of the upper ejector plate near the material head ejector plate. This is used to assist in resetting the upper ejector plate and the lower ejector plate during mold closing.

3. The material head breaking mechanism as described in claim 1, characterized in that: The ejector plate of the material head is provided with a second return pin. The end of the second return pin away from the ejector plate of the material head passes through the male mold plate and is flush with the side of the male mold plate that is close to the female mold plate when the mold is closed. The second return pin is broken by the female mold plate when the mold is closed, thereby resetting the ejector plate of the material head.

4. The material head breaking mechanism as described in claim 1, characterized in that: The pull rod is rotatably connected to the female template via a fixing pin. The female template is also provided with a limiting pin, which is located on the side of the fixing pin near the male template. The pull rod is provided with a limiting hole corresponding to the position of the limiting pin. The limiting hole is an oblong hole perpendicular to the mold opening direction. The limiting pin passes through the limiting hole and is used to limit the pull rod during rotation.

5. The material head breaking mechanism as described in claim 1, characterized in that: The template is also equipped with a protective plate, which surrounds the outside of the tie rod.

6. The material head breaking mechanism as described in claim 1, characterized in that: The connecting assembly includes a connecting rod and an elastic element. One end of the connecting rod is fixed to the ejector plate of the material head, and the elastic element is fixed to the end of the connecting rod away from the ejector plate of the material head. The elastic element is inserted into the connecting hole in the lower fixed plate and is interference-fitted with the connecting hole to position the ejector plate of the material head during the mold opening process.

7. The material head breaking mechanism as described in claim 1, characterized in that: The ejector pin includes a first ejector pin and a second ejector pin. The first ejector pin and the second ejector pin are inserted through the male mold plate and the male mold core and are located below the runner. The first ejector pin is closer to the product than the second ejector pin. The distance between the ejector end of the first ejector pin and the runner is less than the distance between the ejector end of the second ejector pin and the runner.

8. The material head breaking mechanism as described in claim 1, characterized in that: The track groove has a first part, a second part, and a third part. The first part and the third part are arranged in parallel and parallel to the mold opening direction. The first part cooperates with the clearance distance to prevent the pull rod from rotating in the initial stage of mold opening and to prevent the pull rod from getting stuck. The second part is an inclined groove that is inclined towards the pull hook. The third part also has a guide slope at the end away from the second part to guide the pin to slide into the track groove when the mold is closed.

Images