Push rod injection mold

Abstract

The utility model provides a push rod injection mold which comprises a fixed mold and a movable mold, the fixed mold is provided with a fixed mold core, the movable mold is provided with a movable mold core, one side of the fixed mold core close to the movable mold core is provided with a first groove, and one side of the movable mold core close to the fixed mold core is provided with a second groove. And during mold closing, the first groove and the second groove abut against each other to form a runner. The movable mold core is provided with a cavity and a pin-point gate, the cavity is communicated with the runner through the pin-point gate, a first through hole is formed in the bottom of the cavity, a push rod is arranged in the first through hole, one end of the push rod extends into the cavity, and the push rod, the cavity and the fixed mold core form a mold cavity. In the demolding process, the push rod located on the lower side of the pin-point gate cuts off cold materials in the pin-point gate along the inner side wall of the concave cavity, the follow-up punching process is reduced, production efficiency is improved, production cost is reduced, the situation of overcutting in the follow-up punching process can be avoided by cutting off the cold materials along the inner side wall of the concave cavity, the integrity of products can be ensured, and the product quality is improved. The product appearance quality is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to injection mold technical field, concretely relates to a push rod injection mold. BACKGROUND

[0002] A kind of nail is used in the suture process in medical surgical equipment, its volume is smaller, it is easy to shift in ejection process, and then cause deformation or damage, affect product quality.Meanwhile due to the existence of connection between product and sprue cold material, cold material needs to be removed after demolding, to ensure the integrity and appearance quality of product, need to additionally increase punching process, reduce production efficiency, increase production cost.

[0003] Therefore, the above problems need to be solved. INVENTION CONTENT

[0004] The utility model discloses a push rod injection mold, which separates the sprue cold material during demolding, reduces the subsequent punching process while ensuring the appearance quality of the product, improves the production efficiency and reduces the production cost.

[0005] Technical scheme: in order to realize the above-mentioned purpose, including fixed mould and movable mould, the fixed mould is equipped with shaping core, the movable mould is equipped with movable core, the first recess is equipped on the side of shaping core close to movable core, the second recess is equipped on the side of movable core close to shaping core.When clamping, the first recess and the second recess abut to form a flow channel.The movable core is provided with a recess and a fine water gap, the recess and the flow channel are connected through the fine water gap, the first through hole is arranged at the bottom of the recess, the push rod is arranged in the first through hole, one end of the push rod extends into the recess, and the push rod, the recess and the shaping core form a mold cavity.The end of the fine water gap is communicated with the second recess, and the end of the fine water gap away from the second recess is arranged on the side wall of the recess.When clamping, the push rod is arranged on the lower side of the fine water gap.During injection molding, the fixed mould and the movable mould are clamped, the push rod extends into the recess, the push rod, the recess and the shaping core form a mold cavity, the melt flows into the recess through the fine water gap from the flow channel, and the melt is cooled and formed in the recess.During mold separation, the fixed mould and the movable mould are clamped and separated, the shaping core and the movable core are separated, the product remains in the recess, and then the push rod on the lower side of the fine water gap pushes the product away from the recess.In order to remove the sprue cold material, the traditional injection mold often needs to increase the punching process, and the push rod on the lower side of the fine water gap moves along the side wall of the recess during the separation of the product from the recess in the utility model, the cold material in the fine water gap is cut off along the side wall of the recess by the push rod, which does not need to be removed by the punching process, reduces the subsequent punching process, improves the production efficiency, reduces the production cost, and cutting along the inner side wall of the recess can avoid overcutting in the subsequent punching process, improve the product integrity and improve the appearance quality of the product.

[0006] Furthermore, in the above-mentioned push rod injection mold, the push rod includes an outer sleeve and an inner core rod. The outer sleeve is a hollow circular tube. The inner core rod extends into the center of the outer sleeve and extends out of the end of the outer sleeve near the concave cavity. The end of the outer sleeve near the concave cavity is provided with a first boss. The cross-section of the first boss is triangular, and the bosses are arranged in an array along the axis of the outer sleeve. During the injection molding process, the end faces of the inner core rod and the outer sleeve are not flush. The inner core rod serves as a core pin. The molten material cools and solidifies around the inner core rod, leaving holes in the product. After the product cools, the inner core rod remains stationary, and the outer sleeve is pushed to push the product out of the concave cavity, separating the product from the inner core rod. This can reduce the final demolding force and ensure smooth demolding. During the cooling process of the product, the inner core rod remains in the product, which can avoid the problem of shrinkage holes during the cooling process of the product and improve the dimensional accuracy of the product.

[0007] Furthermore, in the aforementioned push rod injection mold, the shaping core is provided with a truncated cone, which is arranged corresponding to the inner core rod. When the mold is closed, the truncated cone and the inner core rod abut against each other, and together they form a core pin, forming a through hole in the center of the product. The truncated cone has a trapezoidal cross-section, which gives the through hole a chamfered corner after the product is formed. During mold separation, the truncated cone separates from the product first, followed by the inner core rod, which reduces demolding force and makes demolding smoother.

[0008] Furthermore, in the aforementioned push rod injection mold, the cavity bottom surface extends in a zigzag pattern along the center, and the outer sleeve is positioned correspondingly to the cavity bottom surface at the end closest to the fixed mold. The outer edge of the outer sleeve at the end closest to the fixed mold forms a right angle. The zigzag pattern of the outer sleeve near the fixed mold increases the contact surface between the outer sleeve and the product, preventing relative rotation between the product and the outer sleeve, and ensuring that the outer sleeve does not shift during the process of pushing the product out of the cavity, thereby preventing damage to the product. The outer edge of the outer sleeve at the end closest to the fixed mold forms a right angle. This right angle arrangement allows the push rod to move along the inner sidewall of the cavity, removing cold material from the sprue and away from the product, ensuring a smooth cross-section.

[0009] Furthermore, the push rod injection mold includes recesses surrounding the cavity, the recesses being arranged in an array around the center of the cavity. During demolding, the product is partially located within the recesses and ejected along the recesses, ensuring that the product moves in a straight line without rotation or displacement, thereby preventing deformation or damage caused by displacement during ejection.

[0010] Furthermore, in the aforementioned push rod injection mold, a concave cavity is provided at each end of the runner, each of which is connected via a fine sprue and a second groove. The runner connects the two cavities, ensuring balanced melt distribution and simultaneous filling of the cavities at both ends with equal filling pressure. This ensures similar product performance and quality, avoids pressure loss, and ensures product quality.

[0011] Furthermore, in the above-mentioned push rod injection mold, a second through hole is provided along the second groove, and an ejector pin is inserted into the second through hole. During demoulding, the ejector pin extends from the second through hole to eject the runner cold material, thus completing demoulding smoothly.

[0012] Furthermore, in the aforementioned push rod injection mold, the ejector pin's end facing away from the fixed mold is connected to an ejector plate, and the ejector plate's end facing away from the movable mold is provided with an ejector backing plate. The ejector plate and backing plate are slidably connected via guide pins. The ejector pin passes through the ejector plate, abutting against the ejector backing plate. An outer sleeve passes through the ejector plate, abutting against the ejector backing plate. After mold separation, the ejector plate and backing plate move, pushing the outer sleeve to release the product from the cavity, which in turn pushes the ejector pin to eject the runner slug. This allows for simultaneous demolding of the product and runner slug, improving demolding efficiency.

[0013] Furthermore, in the aforementioned ejector injection mold, the ejector plate is provided with mold feet on either side. The ends of the mold feet facing away from the movable mold are connected to the base plate, providing support for the movable mold. A panel is provided on the side of the fixed mold facing away from the movable mold. During demolding, the ejector plate and ejector plate slide along the mold feet, ensuring the stability of the ejector and enabling it to smoothly push the cold material out of the runner.

[0014] Furthermore, in the above-mentioned push rod injection mold, the inner core rod passes through the ejector plate and the ejector pad respectively, and the end of the inner core rod away from the fixed mold is connected to the bottom plate to ensure that the inner core rod does not move during the process of the outer sleeve pushing the product out of the cavity, ensuring smooth demolding.

[0015] As can be seen from the above technical solution, the present invention has the following beneficial effects: The push rod injection mold of the present invention pushes the product out of the cavity via the push rod, and the cold material in the sprue is removed along the side wall of the cavity by the push rod located below the sprue, thus reducing the subsequent punching process, improving production efficiency, and reducing production costs. Furthermore, the removal along the inner side wall of the cavity can avoid overcutting in the subsequent punching process, thereby ensuring the integrity of the product and improving the appearance quality of the product. After the product cools, the product is separated from the inner core rod to complete the mold separation, thus avoiding the problem of shrinkage holes in the product during cooling and improving the dimensional accuracy of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a front view of the push rod injection mold of the utility model;

[0017] Figure 2 This is a top view of the push rod injection mold of the utility model;

[0018] Figure 3 for Figure 2 The AA sectional view is shown;

[0019] Figure 4 for Figure 3 Partial enlarged view;

[0020] Figure 5 A bottom view of the shaping core;

[0021] Figure 6It is a top view of the moving core.

[0022] In the figure: 1. panel, 2. fixed mold, 21. fixed core, 211. first groove, 212. round table, 3. movable mold, 31. movable core, 310. fine gate, 311. second groove, 312. concave cavity, 313. first through hole, 314. push rod, 3141. outer sleeve, 3142. inner core rod, 3143. first boss, 315. second through hole, 316. ejector, 317. recess, 4. ejector plate, 5. ejector pad, 6. mold foot, 7. bottom plate, 100. runner. DETAILED DESCRIPTION

[0023] Example 1

[0024] like Figures 1-5The push rod injection mold shown in the application comprises a fixed mold 2 and a movable mold 3. The fixed mold 2 is provided with a fixed core 21, and the movable mold 3 is provided with a movable core 31. The fixed core 21 is provided with a first groove 211 on the side close to the movable core 31, and the movable core 31 is provided with a second groove 311 on the side close to the fixed core 21. When the mold is closed, the first groove 211 and the second groove 311 abut to form a runner 100. The movable core 31 is provided with a recessed cavity 312 and a thin water gap 310. The recessed cavity 312 and the runner 100 are connected through the thin water gap 310. The recessed cavity 312 is provided with a first through hole 313 at the bottom, and a push rod 314 is arranged in the first through hole 313. One end of the push rod 314 extends into the recessed cavity 312. The push rod 314, the recessed cavity 312, and the fixed core 21 form a mold cavity. One end of the thin water gap 310 is connected with the second groove 311, and the other end of the thin water gap 310 is arranged on the side wall of the recessed cavity 312. When the mold is closed, the push rod 314 is arranged on the lower side of the thin water gap 310. The push rod 314 comprises an outer sleeve tube 3141 and an inner core rod 3142. The outer sleeve tube 3141 is a hollow circular tube, and the inner core rod 3142 extends into the center of the outer sleeve tube 3141. The inner core rod 3142 extends out of the outer sleeve tube 3141 and is close to one end of the recessed cavity 312. The outer sleeve tube 3141 is provided with a first boss 3143 close to one end of the recessed cavity 312. The first boss 3143 is triangular in cross section, and the bosses 3143 are arranged along the axis of the outer sleeve tube 3141. The fixed core 21 is provided with a circular table 212 corresponding to the inner core rod 3142. The bottom surface of the recessed cavity 312 is a broken line type when developed along the center. The end of the outer sleeve tube 3141 close to the fixed mold 2 is correspondingly arranged on the bottom surface of the recessed cavity 312, and the outer edge of the end of the outer sleeve tube 3141 close to the fixed mold 2 is at right angles. The ejector pin 316 is connected with an ejector pin plate 4 at the end away from the fixed mold 2. The ejector pin plate 4 is provided with an ejector pin backing plate 5 at the end away from the movable mold 3. The ejector pin plate 4 and the ejector pin backing plate 5 are connected through guide columns in a sliding manner. The ejector pin 316 passes through the ejector pin plate 4, and the ejector pin 316 abuts against the ejector pin backing plate 5. The outer sleeve tube 3141 passes through the ejector pin plate 4, and the outer sleeve tube 3141 abuts against the ejector pin backing plate 5. The inner core rod 3142 passes through the ejector pin plate 4 and the ejector pin backing plate 5, and the end of the inner core rod 3142 away from the fixed mold 2 is connected with a bottom plate 7. The ejector pin backing plate 5 is provided with a mold foot 6 on both sides. The mold foot 6 is connected with the bottom plate 7 at the end away from the movable mold 3, and the mold foot 6 supports the movable mold 3 at the end away from the bottom plate 7. The fixed mold 2 is provided with a face plate 1 on the side away from the movable mold 3.

[0025] During injection molding, the fixed mold 2 and movable mold 3 are closed, and the inner core rod 3142 extends into the concave cavity 312. The inner core rod 3142, outer sleeve 3141, concave cavity 312, and fixed core 21 form the mold cavity. The rounded platform 212 and inner core rod 3142 abut against each other, and the rounded platform 212 and inner core rod 3142 together form a core pin, forming a through hole in the center of the product. The molten material flows from the runner 100 through the fine nozzle 310 into the concave cavity 312. The molten material cools and solidifies around the inner core rod 3142, and the molten material is injection molded within the concave cavity 312. During mold separation, the fixed mold 2 and the movable mold 3 are closed and separated, driving the fixed core 21 and the movable core 31 to separate. The cone 212 is first separated from the product, and the product remains in the cavity 312. Then the ejector plate 4 and the ejector pad 5 move, pushing the outer sleeve 3141 to separate the product and the inner core rod 3142, and the product is ejected from the cavity 312. At the same time, the ejector 316 ejects the cold material of the runner 100 from the second groove 311, completing the mold separation. During the process of removing the product from the cavity 312, the cold material in the fine sprue 310 is cut off along the inner wall of the cavity 312 by the outer sleeve 3141 and separated from the product. The cold material in the runner 100 is ejected out of the second groove 311 by the ejector 316, and the cold material in the fine sprue 310 is taken out together.

[0026] like Figure 6 The ejector injection mold shown has recesses 317 surrounding cavity 312. These recesses 317 are arranged in an array around the center of cavity 312, with their bottom surfaces aligned with the bottom surface of cavity 312. A cavity 312 is provided at each end of flow channel 100, connected via a narrow sprue 310 and a second groove 311. A second through-hole 315 is provided along second groove 311, into which an ejector pin 316 extends.

[0027] The above embodiments are illustrative and intended to illustrate the technical concepts and features of the present invention so that those skilled in the art can understand the present invention and implement it accordingly. They are not intended to limit the scope of protection of the present invention. Any equivalent changes or modifications based on the spirit of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A push rod injection mold, characterized in that: The invention comprises a fixed mold (2) and a movable mold (3), wherein the fixed mold (2) is provided with a fixed core (21), and the movable mold (3) is provided with a movable core (31). A first groove (211) is provided on a side of the fixed core (21) close to the movable core (31), and a second groove (311) is provided on a side of the movable core (31) close to the fixed core (21); when the mold is closed, the first groove (211) and the second groove (311) abut to form a flow channel (100); the movable core (31) is provided with a concave cavity (312) and a fine water outlet (310), and the concave cavity (312) and the flow channel (100) are connected. The concave cavity (312) is connected through a fine sprue (310), a first through hole (313) is provided at the bottom of the concave cavity (312), a push rod (314) is provided in the first through hole (313), one end of the push rod (314) extends into the concave cavity (312), and the push rod (314), the concave cavity (312) and the shaping core (21) constitute a mold cavity; one end of the fine sprue (310) is connected to the second groove (311), and the end of the fine sprue (310) away from the second groove (311) is provided on the side wall of the concave cavity (312); when the mold is closed, the push rod (314) is provided on the lower side of the fine sprue (310).

2. The push rod injection mold according to claim 1, characterized in that: The push rod (314) includes an outer sleeve (3141) and an inner core rod (3142), wherein the outer sleeve (3141) is a hollow circular tube, and the inner core rod (3142) extends into the center of the outer sleeve (3141). The inner core rod (3142) extends out of the outer sleeve (3141) at one end close to the concave cavity (312). A first boss (3143) is provided at the end of the outer sleeve (3141) close to the concave cavity (312), and the cross section of the first boss (3143) is triangular. The bosses (3143) are arranged in an array along the axis of the outer sleeve (3141).

3. The push rod injection mold according to claim 2, characterized in that: The shaping core (21) is provided with a round table (212), and the round table (212) is arranged corresponding to the inner core rod (3142); when the mold is closed, the round table (212) and the inner core rod (3142) are in contact.

4. The push rod injection mold according to claim 2, characterized in that: The bottom surface of the concave cavity (312) is unfolded along the center to form a broken line shape, and the outer sleeve (3141) is arranged corresponding to the bottom surface of the concave cavity (312) at one end close to the fixed mold (2), and the outer edge of the outer sleeve (3141) at one end close to the fixed mold (2) is at a right angle.

5. The push rod injection mold according to claim 4, characterized in that: Concave portions (317) are provided around the concave cavity (312), and the concave portions (317) are arranged in an array around the center of the concave cavity (312), and the bottom surfaces of the concave portions (317) and the bottom surface of the concave cavity (312) are correspondingly arranged.

6. The push rod injection mold according to claim 5, characterized in that: Concave cavities (312) are respectively provided at both ends of the flow channel (100), and the concave cavities (312) are respectively communicated with the second groove (311) through the fine water outlet (310).

7. The push rod injection mold according to claim 2, characterized in that: A second through hole (315) is provided along the second groove (311), and a thimble (316) extends into the second through hole (315).

8. The push rod injection mold according to claim 7, characterized in that: The ejector pin (316) is connected to an ejector plate (4) at one end away from the fixed mold (2), and an ejector plate (5) is provided at one end of the ejector plate (4) away from the movable mold (3). The ejector plate (4) and the ejector plate (5) are slidably connected via a guide column. The ejector pin (316) passes through the ejector plate (4), and the ejector pin (316) and the ejector plate (5) abut against each other. The outer sleeve (3141) passes through the ejector plate (4), and the outer sleeve (3141) and the ejector plate (5) abut against each other.

9. The push rod injection mold according to claim 8, characterized in that: A mold foot (6) is provided on both sides of the ejector plate (5), and one end of the mold foot (6) away from the movable mold (3) is connected to a bottom plate (7), and the end of the mold foot (6) away from the bottom plate (7) supports the movable mold (3); a panel (1) is provided on the side of the fixed mold (2) away from the movable mold (3).

10. The push rod injection mold according to claim 9, characterized in that: The inner core rod (3142) passes through the ejector plate (4) and the ejector pad (5) respectively, and the end of the inner core rod (3142) away from the fixed mold (2) is connected to the bottom plate (7).

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