Injection mold for injection molding part

Abstract

The utility model relates to the technical field of production of injection molding parts, in particular to an injection mold for injection molding parts, which comprises a fixed mold, two injection cavities are arranged on the outer wall of the fixed mold, mold cores are fixedly connected in the injection cavities, a movable mold is arranged at the front end of the fixed mold in an attached manner, injection cavities with the same structure are arranged on the movable mold, and the mold cores are fixedly connected in the injection cavities. A mounting cavity is formed in the inner wall of the fixed mold, a cutting mechanism is arranged in the inner wall of the mounting cavity, the cutting mechanism comprises an injection channel formed in the outer wall of the fixed mold, the injection channel communicates with the injection cavity, a cutter is slidably connected into the injection channel, and a pushing piece is arranged at the rear end of the cutter; a material returning piece is further arranged in the mounting cavity, and an injection opening is communicated with the interior of the injection channel. According to the device, through the arrangement of the cutting mechanism, edge materials for injection molding can be automatically cut during demolding, produced pipe fittings are separated, and the operation intensity of workers is reduced.

Description

Technical Field

[0001] This utility model relates to the field of injection molding production technology, specifically to an injection mold for injection molding parts. Background Technology

[0002] Injection molding is currently the most widely used molding process in plastic pipe fittings processing. The structure of the injection mold directly determines the molding quality, production efficiency and cost of the injection part. During the conventional injection molding process, due to factors such as mold fitting clearance, injection pressure and melt flow, the injection molded part will have flash, burrs and other excess material edges at the gate.

[0003] Chinese utility model patent CN220883219U discloses an injection mold for producing plastic pipe fittings, which includes "an installation plate, a movable mold fixedly connected to one side of the bottom of the installation plate, two parting molds assembled at the bottom of the movable mold, and the two parting molds matching each other, and a connecting plate provided at the bottom of the two parting molds; long rods fixedly connected to both sides of the outer surface of the movable mold, and a linkage component installed between the two long rods and the two parting molds; fixing plates installed on both sides of the outer surface of the connecting plate, and an ejection component installed between the two fixing plates and the adjacent parting molds"; however, in the prior art, it is impossible to clean off the excess material edge in time when the injection molded part is demolded, so the workers need to manually remove the injection molded part and manually cut off the excess material edge. Utility Model Content

[0004] The purpose of this utility model is to provide an injection mold for injection molded parts to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an injection mold for injection molded parts, including a fixed mold, two injection cavities for producing plastic pipe fittings are formed on the outer wall of the fixed mold, and a core is fixedly connected in the injection cavity; a moving mold is fitted to the front end of the fixed mold, and an injection cavity with the same structure is formed on the moving mold; an installation cavity is formed in the inner wall of the fixed mold, and a cutting mechanism for cutting off the overflow edge is provided in the inner wall of the installation cavity;

[0006] The cutting mechanism includes an injection channel formed on the outer wall of the fixed mold, and the injection channel is connected to the injection cavity. A cutting blade is slidably connected in the injection channel, and a pusher is provided at the rear end of the cutting blade.

[0007] The mounting cavity is also equipped with a material ejection component for material ejection;

[0008] The injection channel is connected to an injection port.

[0009] Preferably, the pusher includes an arc-shaped plate slidably connected inside the fixed mold, and the rear end of the arc-shaped plate is connected to the inner wall of the fixed mold via a return spring;

[0010] A connecting rod is fixedly connected to the top of the arc-shaped plate, and the connecting rod has an L-shaped structure. An impact rod is fixedly connected to one side of the connecting rod. By setting the arc-shaped plate, the cutting blade can be triggered to store force when the mold is in place, and the waste edge material can be cut off when the mold is separated.

[0011] Preferably, the pusher further includes a guide rod fixed to the rear end of the cutter, the outer wall of the guide rod being slidably connected to the inner wall of the impact rod;

[0012] A protrusion is fixedly connected to the outer wall of the impact rod, and a rotating column is rotatably connected to the outer wall of the impact rod. The outer wall of the rotating column is slidably connected to the inner wall of the mounting cavity. An arc-shaped groove is formed in the inner wall of the rotating column, and the arc-shaped groove is slidably connected to the protrusion. When the impact rod slides on the guide rod, the protrusion on the impact rod will slide in the arc-shaped groove, pushing the rotating column to rotate. By restricting the rotation of the rotating column, the movement of the impact rod is restricted.

[0013] Preferably, an impact plate is fixedly connected to the outer wall of the guide rod, and a rubber layer is fixedly connected to the outer wall of the impact plate. The impact plate is coaxially and horizontally arranged with the impact rod. The impact plate is arranged so that when the impact rod moves to reset, it can quickly impact the impact plate, causing the cutting blade to be pushed out and cutting off the edge material in front of the cutting blade.

[0014] Preferably, a movable piece is slidably connected to the inner wall of the mounting cavity, and an L-shaped movable groove is opened at the top of the movable piece. A limiting post is slidably connected in the movable groove, and a spring telescopic rod is fixedly connected to the top of the limiting post. The top of the spring telescopic rod has a wedge-shaped structure.

[0015] The bottom end of the rotating column is fixedly connected to a limiting rod. The limiting rod can be blocked by a wedge-shaped spring telescopic rod, thus restricting the rotating column from rotating.

[0016] Preferably, the inner wall of the mounting cavity has two symmetrically arranged limiting holes, with one shallow and one deep. The two limiting holes are connected by an inclined groove. When the moving piece moves with the push plate, the moving groove on the moving piece can drive the limiting post to slide in the inclined groove, so that the inclined groove moves from the shallower limiting hole to the other limiting hole. The limiting post drives the spring telescopic rod to move downward. The spring telescopic rod no longer restricts the position of the limiting rod, and the rotating column can rotate normally, causing the impact rod to be reset by the reset spring on the arc plate, impacting the impact plate and pushing out the cutting blade to cut the edge material.

[0017] Preferably, the ejector includes a hydraulic rod fixed in the inner wall of the mounting cavity, a connecting plate fixedly connected to the front end of the hydraulic rod, and pushers fixedly connected to both the upper and lower ends of the connecting plate, with the two pushers corresponding one-to-one with the two injection cavities;

[0018] Both of the push disks have ejector rods fixedly connected in a ring array on their outer walls, and the two sets of ejector rods are inserted into the injection cavity respectively;

[0019] The side wall of the pusher plate is fixedly connected to the moving plate. The ejector rod facilitates the automatic ejection of the plastic tube from the injection cavity, thus achieving automatic ejection.

[0020] Preferably, the inner wall of the moving mold is provided with an ejector with the same structure as that in the fixed mold, and an L-shaped rod is fixedly connected to the outer wall of the connecting plate in the moving mold. A push plate is horizontally provided at the front end of the L-shaped rod, and the push plate extends into the inner wall of the injection channel.

[0021] The rear end of the push plate is symmetrically and fixedly connected with a spring rod, and the other end of the spring rod is fixedly connected to the inner wall of the moving mold. The rear end of the cutter is fixedly connected with a spring rod of the same structure, and the spring rod is fixedly connected to the inner wall of the fixed mold. By setting the push plate, the waste edge material in the injection channel can be pushed out for waste material recycling, and all material removal operations can be realized.

[0022] The beneficial effects of this utility model are as follows:

[0023] In this utility model, by setting up a cutting mechanism, the edge material of the injection molding can be automatically cut during demolding, separating the produced pipe fittings, reducing the labor intensity of the workers, and facilitating the subsequent processing of the pipe fittings by the workers.

[0024] In this invention, the ejector component allows for the ejection of pipe fittings and cut edge material, facilitating the ejection of injection molded parts and simplifying the use of the device.

[0025] The parts of the device not covered herein are the same as or can be implemented using existing technologies. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention;

[0027] Figure 2 This is a schematic diagram of the three-dimensional structure of the moving mold and the fixed mold of this utility model;

[0028] Figure 3 This is a schematic cross-sectional view of the fixed mold structure of this utility model;

[0029] Figure 4 This is a three-dimensional structural diagram of the cutting mechanism of this utility model;

[0030] Figure 5 This is a cross-sectional view of the pusher component of this utility model;

[0031] Figure 6 This is a partial cross-sectional view of the mounting cavity of this utility model;

[0032] Figure 7 This utility model Figure 6 Enlarged structural diagram at point A in the middle;

[0033] Figure 8 This is a schematic cross-sectional view of the moving mold structure of this utility model.

[0034] In the diagram: 1. Fixed mold; 2. Injection cavity; 3. Core; 4. Moving mold; 5. Mounting cavity; 6. Cutting mechanism; 61. Cutting blade; 62. Pushing component; 621. Arc plate; 622. Connecting rod; 623. Impact rod; 624. Guide rod; 625. Protrusion; 626. Rotating column; 627. Arc groove; 628. Impact disc; 629. Moving piece; 6210. Moving groove; 6211. Limiting post; 6212. Spring telescopic rod; 6213. Limiting rod; 6214. Limiting hole; 63. Unloading component; 631. Hydraulic rod; 632. Connecting plate; 633. Pushing disc; 634. Unloading rod; 635. L-shaped rod; 636. Push plate; 637. Spring rod; 64. Injection port. Detailed Implementation

[0035] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be described in detail below with reference to the accompanying drawings. The description in this part is only exemplary and explanatory, and should not be used to limit the scope of protection of this utility model in any way.

[0036] Please see Figures 1 to 8 An injection mold for injection molding parts includes a fixed mold 1, two injection cavities 2 for producing plastic pipe fittings are opened on the outer wall of the fixed mold 1, and a core 3 is fixedly connected in the injection cavity 2. A movable mold 4 is attached to the front end of the fixed mold 1, and an injection cavity 2 with the same structure is opened on the movable mold 4. An installation cavity 5 is opened in the inner wall of the fixed mold 1, and a cutting mechanism 6 for cutting off the overflow edge is provided in the inner wall of the installation cavity 5.

[0037] The cutting mechanism 6 includes an injection channel opened on the outer wall of the fixed mold 1, and the injection channel is connected to the injection cavity 2. A cutting blade 61 is slidably connected in the injection channel, and a pusher 62 is provided at the rear end of the cutting blade 61.

[0038] The mounting cavity 5 is also equipped with a material ejection component 63 for material ejection;

[0039] The injection channel is connected to an injection port 64.

[0040] In this embodiment, as Figure 2 and Figure 3 As shown, the pusher 62 includes an arc-shaped plate 621 that is slidably connected inside the fixed mold 1. The rear end of the arc-shaped plate 621 is connected to the inner wall of the fixed mold 1 through a return spring.

[0041] A connecting rod 622 is fixedly connected to the top of the arc plate 621, and the connecting rod 622 has an L-shaped structure. An impact rod 623 is fixedly connected to one side of the connecting rod 622.

[0042] In this embodiment, as Figure 3 , Figure 4 and Figure 5 As shown, the pusher 62 also includes a guide rod 624 fixed to the rear end of the cutter 61, and the outer wall of the guide rod 624 is slidably connected to the inner wall of the impact rod 623;

[0043] A protrusion 625 is fixedly connected to the outer wall of the impact rod 623, and a rotating column 626 is rotatably connected to the outer wall of the impact rod 623. The outer wall of the rotating column 626 is slidably connected to the inner wall of the mounting cavity 5. An arc-shaped groove 627 is opened in the inner wall of the rotating column 626, and the arc-shaped groove 627 is slidably connected to the protrusion 625.

[0044] In this embodiment, as Figure 3 and Figure 5 As shown, an impact disc 628 is fixedly connected to the outer wall of the guide rod 624, and a rubber layer is fixedly connected to the outer wall of the impact disc 628. The impact disc 628 and the impact rod 623 are coaxially and horizontally arranged.

[0045] In this embodiment, as Figure 3 , Figure 4 and Figure 5 As shown, a movable piece 629 is slidably connected to the inner wall of the mounting cavity 5. The top of the movable piece 629 is provided with an L-shaped movable groove 6210. A limiting post 6211 is slidably connected in the movable groove 6210. A spring telescopic rod 6212 is fixedly connected to the top of the limiting post 6211. The top of the spring telescopic rod 6212 is a wedge-shaped structure.

[0046] A limit rod 6213 is fixedly connected to the bottom end of the rotating column 626.

[0047] In this embodiment, as Figure 3 , Figure 6 and Figure 7 As shown, two symmetrically arranged limiting holes 6214 are provided in the inner wall of the mounting cavity 5, and the depths of the two limiting holes 6214 are set to be one shallow and one deep. The two limiting holes 6214 are connected by an inclined groove.

[0048] In this embodiment, as Figure 3 and Figure 8As shown, the ejector 63 includes a hydraulic rod 631 fixed in the inner wall of the mounting cavity 5. A connecting plate 632 is fixedly connected to the front end of the hydraulic rod 631. Pushing discs 633 are fixedly connected to both the upper and lower ends of the connecting plate 632, and the two pushing discs 633 correspond one-to-one with the two injection cavities 2.

[0049] The outer walls of the two push disks 633 are fixedly connected with ejector rods 634 in a ring array, and the two sets of ejector rods 634 are respectively inserted into the injection cavity 2;

[0050] The side wall of the push disk 633 is fixedly connected to the moving piece 629.

[0051] In this embodiment, as Figure 3 and Figure 8 As shown, the inner wall of the moving mold 4 is provided with a material ejector 63 with the same structure as that in the fixed mold 1. An L-shaped rod 635 is fixedly connected to the outer wall of the connecting plate 632 in the moving mold 4. A push plate 636 is horizontally provided at the front end of the L-shaped rod 635, and the push plate 636 extends into the inner wall of the injection channel.

[0052] A spring rod 637 is symmetrically fixedly connected to the rear end of the push plate 636, and the other end of the spring rod 637 is fixedly connected to the inner wall of the moving mold 4. A spring rod 637 with the same structure is fixedly connected to the rear end of the cutter 61, and the spring rod 637 is fixedly connected to the inner wall of the fixed mold 1.

[0053] The injection mold used for this injection molded part operates as follows:

[0054] First, the fixed mold 1 and the moving mold 4 are closed and fitted together. Molten plastic is injected from the injection channel and sent along the injection channel into the two injection cavities 2, filling the gap between the injection cavity 2 and the core 3 until the tube is formed.

[0055] Simultaneously, when the fixed mold 1 and the moving mold 4 are in contact, the moving mold 4 pushes the arc plate 621 to move backward. The arc plate 621 drives the impact rod 623 to slide on the guide rod 624 through the connecting rod 622. When the impact rod 623 moves backward synchronously, the protrusion 625 on the impact rod 623 slides in the arc groove 627, thereby pushing the rotating column 626 to rotate. The limiting rod 6213 on the rotating column 626 contacts the wedge-shaped surface of the spring telescopic rod 6212, squeezing the spring telescopic rod 6212 to contract, so that the limiting rod 6213 moves to one side of the spring telescopic rod 6212. At this time, the limiting rod 6213 moves to the opposite side of the wedge-shaped surface and can no longer squeeze the spring telescopic rod 6212 to contract, so that the rotating column 626 is stuck and the entire impact rod 623 cannot move.

[0056] After injection molding is completed, the fixed mold 1 and the moving mold 4 separate. The hydraulic rod 631 in the fixed mold 1 pushes the push plate 633 through the connecting plate 632. Several ejection rods 634 on the two push plates 633 are ejected from the injection cavity 2, gradually pushing the tube out of the injection cavity 2. At the same time, the push plate 633 synchronously drives the moving plate 629 to move, so that the limiting post 6211 and the moving groove 6210 move relative to each other. Since the moving groove 6210 has an L-shaped structure, when the limiting post 6211 gradually moves to the edge of the moving groove 6210, the slope of the moving groove 6210 will limit the limiting post 6211 from a shallower position. The limiting post 6211 is pushed into the deeper limiting hole 6214 at hole 6214, causing the limiting post 6211 to move forward. At the same time, it will also drive the spring telescopic rod 6212 to move downward. The spring telescopic rod 6212 no longer blocks the limiting rod 6213. At this time, there is a gap between the moving mold 4 and the fixed mold 1. The arc plate 621 is no longer restricted. The arc plate 621 is reset by the reset spring. Simultaneously, the impact rod 623 slides on the guide rod 624. The impact rod 623 quickly hits the impact plate 628, pushing the cutter 61 to move forward. The cutter 61 is pushed out from the injection channel and quickly cuts the scrap material in front, separating the two injection molded tubes.

[0057] Meanwhile, due to the setting of several ejector rods 634 in the fixed mold 1, the injection tube will remain on the moving mold 4 when the mold is separated, and the scrap in the injection channel is cut by the cutter 61, so that the scrap and the injection tube in the injection cavity 2 are separated. At this time, the hydraulic rod 631 in the moving mold 4 is activated, and the injection tube is pushed out through the push plate 633 and ejector rod 634 with the same structure. At the same time, the L-shaped rod 635 on the connecting plate 632 moves forward synchronously, pushing the push plate 636 out of the injection channel of the moving mold 4, so that the scrap and the injection tube are pushed out, completing the entire demolding process. Since the scrap between the injection tubes is cut off and the injection tubes are separated, it is convenient for the staff to carry out subsequent processing and reduce the operation process.

[0058] After all the processes are completed, the hydraulic rod 631 in the moving mold 4 drives the push plate 633 to reset, the L-shaped rod 635 no longer presses the push plate 636, and the push plate 636 is reset by the spring rod 637. The same operation process is carried out in the fixed mold 1. The push plate 633 in the fixed mold 1 drives the moving piece 629 to reset. The moving piece 629 moves in the opposite direction and pushes the limit post 6211 to reset through the inclined surface of the moving groove 6210, so that the spring telescopic rod 6212 returns to its initial state, that is, the spring telescopic rod 6212 is at the highest point, waiting for the next trigger, and the cutter 61 is reset synchronously through the spring rod 637.

[0059] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0060] It should be noted that, in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0061] This article uses specific examples to illustrate the principles and implementation methods of this utility model. The above examples are only for the purpose of helping to understand the method and core ideas of this utility model. The above description is only a preferred embodiment of this utility model. It should be noted that due to the limitations of textual expression, there are objectively infinite specific structures. For those skilled in the art, several improvements, modifications, or changes can be made without departing from the principles of this utility model, and the above technical features can also be combined in an appropriate manner. These improvements, modifications, changes, or combinations, or the direct application of the concept and technical solution of the utility model to other occasions without modification, should all be considered within the protection scope of this utility model.

Claims

1. An injection mold for injection molding parts, comprising a fixed mold (1), wherein two injection cavities (2) for producing plastic pipe fittings are formed on the outer wall of the fixed mold (1), and a core (3) is fixedly connected in the injection cavities (2), and a movable mold (4) is fitted to the front end of the fixed mold (1), and the movable mold (4) is provided with injection cavities (2) of the same structure, characterized in that: The inner wall of the fixed mold (1) is provided with an installation cavity (5), and the inner wall of the installation cavity (5) is provided with a cutting mechanism (6) for cutting off the overflow edge. The cutting mechanism (6) includes an injection channel opened on the outer wall of the fixed mold (1), and the injection channel is connected to the injection cavity (2). A cutting blade (61) is slidably connected in the injection channel, and a pusher (62) is provided at the rear end of the cutting blade (61). The mounting cavity (5) is also provided with a material ejection component (63) for material ejection; The injection channel is connected to an injection port (64) for injecting molten plastic.

2. The injection mold for injection molded parts as described in claim 1, characterized in that: The pusher (62) includes an arc plate (621) slidably connected inside the fixed mold (1). The rear end of the arc plate (621) is connected to the inner wall of the fixed mold (1) through a return spring so that the arc plate (621) always maintains the tendency to move outward. The top of the arc plate (621) is fixedly connected to a connecting rod (622), and the connecting rod (622) has an L-shaped structure. An impact rod (623) is fixedly connected to one side of the connecting rod (622). The impact rod (623) is used to strike the cutter (61) to cut the waste material injected into the channel.

3. The injection mold for injection molded parts as described in claim 2, characterized in that: The pusher (62) also includes a guide rod (624) fixed to the rear end of the cutter (61). The outer wall of the guide rod (624) is slidably connected to the inner wall of the impact rod (623), and the guide rod (624) is used to guide the impact rod (623) to slide horizontally. The outer wall of the impact rod (623) is fixedly connected to a protrusion (625), and a rotating column (626) is rotatably connected to the outer wall of the impact rod (623). The outer wall of the rotating column (626) is slidably connected to the inner wall of the mounting cavity (5). The rotating column (626) is used to limit the reset of the impact rod (623) to avoid affecting the injection molding operation. An arc groove (627) is provided in the inner wall of the rotating column (626), and the arc groove (627) is slidably connected to the protrusion (625).

4. The injection mold for injection molded parts as described in claim 3, characterized in that: An impact plate (628) is fixedly connected to the outer wall of the guide rod (624). A rubber layer is fixedly connected to the outer wall of the impact plate (628) for buffering the impact force. The impact plate (628) and the impact rod (623) are coaxially and horizontally arranged to withstand the impact and push the cutter (61) to cut.

5. The injection mold for injection molded parts as described in claim 3, characterized in that: A movable piece (629) is slidably connected to the inner wall of the mounting cavity (5). The top end of the movable piece (629) is provided with an L-shaped movable groove (6210). A limiting post (6211) is slidably connected in the movable groove (6210). A spring telescopic rod (6212) is fixedly connected to the top end of the limiting post (6211). The top end of the spring telescopic rod (6212) is a wedge-shaped structure. The spring telescopic rod (6212) is used to limit the rotation of the rotating column (626). The bottom end of the rotating column (626) is fixedly connected to a limiting rod (6213), and the limiting rod (6213) and the spring telescopic rod (6212) are used to realize the unidirectional rotation of the rotating column (626).

6. The injection mold for injection molded parts as described in claim 5, characterized in that: The inner wall of the mounting cavity (5) has two symmetrically arranged limiting holes (6214), and the depths of the two limiting holes (6214) are set to be one shallow and one deep. The two limiting holes (6214) are connected by an inclined groove to realize the up and down movement of the limiting column (6211) and release or restrict the rotation state of the rotating column (626).

7. The injection mold for injection molded parts as described in claim 5, characterized in that: The ejector (63) includes a hydraulic rod (631) fixed in the inner wall of the mounting cavity (5). A connecting plate (632) is fixedly connected to the front end of the hydraulic rod (631). Pushing discs (633) are fixedly connected to both the upper and lower ends of the connecting plate (632), and the two pushing discs (633) correspond one-to-one with the two injection cavities (2). The outer walls of the two push disks (633) are fixedly connected with ejector rods (634) in a ring array, and the two sets of ejector rods (634) are respectively inserted into the injection cavity (2) to realize the ejection of plastic pipe parts; The side wall of the push disk (633) is fixedly connected to the movable piece (629).

8. The injection mold for injection molded parts as described in claim 7, characterized in that: The inner wall of the moving mold (4) is provided with a material ejector (63) having the same structure as that in the fixed mold (1). An L-shaped rod (635) is fixedly connected to the outer wall of the connecting plate (632) in the moving mold (4). A push plate (636) is horizontally provided at the front end of the L-shaped rod (635). The push plate (636) extends into the inner wall of the injection channel. The push plate (636) is used to push out the waste material in the injection channel. The rear end of the push plate (636) is symmetrically and fixedly connected with a spring rod (637), and the other end of the spring rod (637) is fixedly connected to the inner wall of the moving mold (4).

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