Injection nozzle cutting-off device

Abstract

This utility model relates to the field of injection molding technology, and in particular to an injection gate cutting device, including a worktable with a lower mold and an upper mold on the worktable. The worktable also has a lifting seat and a lifting mechanism for driving the lifting seat to move up and down. An electric telescopic rod is installed on the lifting seat, and a cutter holder is fixedly connected to the driving end of the electric telescopic rod. A cutter is installed on the cutter holder. A groove is formed on the upper surface of the upper mold near the lifting seat, with the groove facing the cutter. An injection port is formed at the bottom of the groove. This utility model integrates a cutting component consisting of a lifting seat, an electric telescopic rod, a cutter holder, and a cutter into the device. Combined with the groove in the upper mold facing the cutter and the injection port, the gate cutting operation can be completed directly after injection molding. This avoids problems such as part removal jamming and injection part deformation caused by gate connection in the traditional "first demolding, then cutting" process, making the demolding process smoother.

Description

Technical Field

[0001] This utility model relates to the field of injection molding technology, and more specifically to an injection gate cutting-off device. Background Technology

[0002] Injection molding is a method of shaping industrial products. Products are typically produced using rubber injection molding and plastic injection molding. Injection molding can also be divided into injection molding compression molding and die casting.

[0003] In rubber or plastic injection molding, molten rubber or plastic is injected into the mold cavity through the gate. The gate, also known as the feed port, is the channel from the runner to the mold cavity and is the smallest and shortest part of the gating system.

[0004] Most existing injection molds do not have a gate cutting device, which makes it inconvenient to remove the mold after rubber or plastic injection molding. To address this, we propose an injection gate cutting device to facilitate the removal of the mold after rubber or plastic injection molding. Utility Model Content

[0005] The purpose of this invention is to provide an injection gate cutting device that can directly cut off the gate after injection molding, making the demolding process smoother.

[0006] To achieve the above objectives, the technical solution of this utility model is as follows:

[0007] An injection molding gate cutting device includes a worktable with a lower mold and an upper mold. The worktable also has a lifting seat and a lifting mechanism for driving the lifting seat to move up and down. An electric telescopic rod is installed on the lifting seat, and a cutter holder is fixedly connected to the driving end of the electric telescopic rod. A cutter is installed on the cutter holder. A groove is formed on the upper surface of the upper mold near the lifting seat, and the groove is positioned opposite the cutter. An injection port is formed at the bottom of the groove.

[0008] Furthermore, a mounting frame is provided on the workbench, and a hydraulic cylinder is mounted on the mounting frame. The drive end of the hydraulic cylinder is fixedly connected to the upper mold, and the lower mold is fixedly connected to the workbench. The upper mold is located above the lower mold.

[0009] Furthermore, a lifting frame is vertically fixed on the workbench; the lifting mechanism includes a lifting screw that is vertically rotatably mounted on the lifting frame, a screw motor that drives the lifting screw is mounted on the lifting frame, the lifting seat is threadedly connected to the lifting screw, a guide rod is vertically mounted on the lifting frame, and the lifting seat is slidably sleeved on the guide rod.

[0010] Furthermore, a limiting plate is fixedly connected to the lifting frame, and the limiting plate is located below the lifting seat.

[0011] Furthermore, the bottom of the groove near the cutter end is chamfered.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0013] This application integrates a cutting assembly consisting of a lifting seat, an electric telescopic rod, a cutter holder, and a cutter into the device. With the groove and injection port of the mold facing the cutter, the gate cutting operation can be completed directly after injection molding. There is no need to transfer the injection molded part to other cutting equipment. This avoids the problems of part removal jamming and injection molded part deformation caused by gate connection in the traditional "first demolding, then cutting" process, making the demolding process smoother. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of the present invention. Figure 1 ;

[0015] Figure 2 This is a schematic diagram of the structure of the present invention. Figure 2 .

[0016] 1. Workbench; 2. Lower mold; 3. Upper mold; 301. Groove; 302. Injection port; 4. Lifting seat; 5. Electric telescopic rod; 6. Tool holder; 7. Cutting knife; 8. Mounting bracket; 9. Hydraulic cylinder; 10. Lifting frame; 11. Lifting screw; 12. Screw motor; 13. Guide rod; 14. Limit plate. Detailed Implementation

[0017] like Figure 1 and Figure 2 As shown, an injection gate cutting device includes a workbench 1, on which a lower mold 2 and an upper mold 3 are provided. The workbench 1 is also provided with a lifting seat 4 and a lifting mechanism for driving the lifting seat 4 to move up and down. An electric telescopic rod 5 is installed on the lifting seat 4. A knife holder 6 is fixedly connected to the driving end of the electric telescopic rod 5. A cutter 7 is installed on the knife holder 6. A groove 301 is opened on the upper surface of the upper mold 3 near the lifting seat 4. The groove 301 is set directly opposite the cutter 7. An injection port 302 is opened at the bottom of the groove 301.

[0018] The workbench 1 is provided with a mounting frame 8, and a hydraulic cylinder 9 is mounted on the mounting frame 8. The drive end of the hydraulic cylinder 9 is fixedly connected to the upper mold 3, and the lower mold 2 is fixedly connected to the workbench 1. The upper mold 3 is located above the lower mold 2.

[0019] A lifting frame 10 is vertically fixed on the workbench 1; the lifting mechanism includes a lifting screw 11 that is vertically rotatably mounted on the lifting frame 10, a screw motor 12 that drives the lifting screw 11 is mounted on the lifting frame 10, the lifting seat 4 is threadedly connected to the lifting screw 11, a guide rod 13 is vertically mounted on the lifting frame 10, and the lifting seat 4 is slidably sleeved on the guide rod 13.

[0020] A limiting plate 14 is fixedly connected to the lifting frame 10. The limiting plate 14 is located below the lifting seat 4. The limiting plate 14 serves as the downward limit position constraint for the lifting seat 4. It can block the lifting seat 4 in time when it descends to the set position, so as to avoid the cutter 7 from hitting the lower mold 2 or the upper mold 3 due to the loss of control of the lead screw motor 12 or operation error. This protects the cutting edge of the cutter 7 and the mold structure, and reduces the equipment maintenance cost.

[0021] The bottom of the groove 301 near the cutter 7 has a chamfer.

[0022] Working principle:

[0023] The rubber or plastic raw material to be injected is put into the injection molding machine, and the nozzle of the injection molding machine is aligned with the injection port 302 of the upper mold 3; the hydraulic cylinder 9 on the mounting frame 8 is started, and the hydraulic cylinder 9 drives the upper mold 3 to move vertically downward until the upper mold 3 and the lower mold 2 are tightly closed to form a closed mold cavity.

[0024] The injection molding machine injects molten raw material into the mold cavity through the injection port 302 of the upper mold 3. The raw material cools and solidifies in the cavity to form an injection molded part that conforms to the shape of the cavity. At the same time, a connecting structure is formed at the gate where the injection port 302 connects to the cavity (the gate is the channel for the raw material to flow into the cavity and needs to be cut off after molding).

[0025] During the cooling and solidification process of the raw material (or after solidification), the lead screw motor 12 on the lifting frame 10 is started. The lead screw motor 12 drives the lifting lead screw 11 to rotate. Since the lifting seat 4 is threadedly connected to the lifting lead screw 11 and is limited by the guide rod 13, the lifting seat 4 moves vertically along the guide rod 13, driving the electric telescopic rod 5, the knife holder 6 and the cutter 7 to rise and fall synchronously until the height of the cutter 7 is aligned with the gate position in the groove 301 of the upper mold 3 (the limiting plate 14 ensures that the lifting seat 4 will not descend excessively).

[0026] Start the electric telescopic rod 5. The drive end of the electric telescopic rod 5 pushes the cutter holder 6 to move towards the groove 301 of the upper mold 3. The cutter holder 6 drives the cutter 7 to cut into the groove 301 and cut off the connection between the gate and the injection molded part. After the cut is completed, the electric telescopic rod 5 drives the cutter 7 to reset. At the same time, the lead screw motor 12 drives the lifting seat 4 and the cutter 7 to rise to the initial position.

[0027] Hydraulic cylinder 9 drives upper mold 3 to move vertically upward, realizing mold opening; since the gate has been cut off, the injection molded part is separated from the gate waste, and the operator can directly take out the molded injection molded part from the lower mold 2, while the gate waste slides down naturally along the chamfer at the bottom of the groove 301, completing a single production cycle.

[0028] This invention integrates the gate cutting process into the injection mold system, eliminating the need for additional transfer of injection molded parts. It also eliminates redundant steps in traditional production, such as "parts picked up from injection molding machine - transferred to cutting equipment - manual cutting - return for inspection", shortening the single production cycle and adapting to the cycle time requirements of automated production lines.

[0029] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A gate cutting device for injection molding, characterized in that: The device includes a workbench (1), on which a lower mold (2) and an upper mold (3) are provided. The workbench (1) is also provided with a lifting seat (4) and a lifting mechanism for driving the lifting seat (4) to move up and down. An electric telescopic rod (5) is installed on the lifting seat (4). A knife holder (6) is fixedly connected to the driving end of the electric telescopic rod (5). A cutter (7) is installed on the knife holder (6). A groove (301) is provided on the upper surface of the upper mold (3) near the lifting seat (4). The groove (301) is positioned opposite the cutter (7). An injection port (302) is provided at the bottom of the groove (301).

2. The injection gate cutting device as described in claim 1, characterized in that: The workbench (1) is provided with a mounting frame (8), and a hydraulic cylinder (9) is mounted on the mounting frame (8). The drive end of the hydraulic cylinder (9) is fixedly connected to the upper mold (3), and the lower mold (2) is fixedly connected to the workbench (1). The upper mold (3) is located above the lower mold (2).

3. The injection gate cutting device as described in claim 1, characterized in that: A lifting frame (10) is vertically fixed on the workbench (1); the lifting mechanism includes a lifting screw (11) that is vertically rotatably mounted on the lifting frame (10), a screw motor (12) that drives the lifting screw (11) is installed on the lifting frame (10), the lifting seat (4) is threadedly connected to the lifting screw (11), a guide rod (13) is vertically mounted on the lifting frame (10), and the lifting seat (4) is slidably sleeved on the guide rod (13).

4. The injection port shut-off apparatus of claim 3, wherein: A limiting plate (14) is fixedly connected to the lifting frame (10), and the limiting plate (14) is located below the lifting seat (4).

5. The injection gate cutting device as described in claim 1, characterized in that: The bottom of the groove (301) near the cutter (7) has a chamfer.

Images