Rapid injection mold for plastic gear

Abstract

The utility model relates to the technical field of injection molding machinery, in particular to a quick injection mold for a plastic gear, which comprises an upper mold and a lower mold, and a plurality of cavities capable of forming an injection molding gear after the upper mold and the lower mold are oppositely buckled are arranged on the opposite sides of the upper mold and the lower mold. The diversion trench is communicated with a plurality of diversion trenches which are respectively communicated with the cavities, the cavities are communicated through short trenches, and an insertion hole is formed in the bottom surface of the diversion trench in a penetrating manner; a fixed plate is arranged below the lower mold, an injection molding guide pipe is vertically fixed on the fixed plate, and the injection molding guide pipe is connected into the insertion hole in an insertion and extraction manner, so that a plurality of injection molding gears with high consistency can be rapidly molded through the same mold, and the cutting, separation and ejection of products can be integrally completed.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molding machinery, in particular to a rapid injection mold for plastic gears. Background Art

[0002] Injection molded gears are plastic gears manufactured using injection molding. These gears are typically made from thermoplastics such as polyoxymethylene (POM), nylon (PA), and polycarbonate (PC). Injection molding involves injecting molten plastic into a mold under high pressure, where it cools to form the desired gear shape.

[0003] In existing injection gear molds, the uneven distribution of the cavity and injection runner often leads to gear warping or deformation, resulting in low product consistency. In addition, in traditional molds, there is often a lot of excess material at the connection between the gear and the pouring system, which requires the molding and injection molding room to be removed and then separated and reshaped, resulting in a lot of excess material and low efficiency. Utility Model Content

[0004] 1. Technical Problems to be Solved

[0005] The purpose of the utility model is to provide a rapid injection mold for plastic gears, which can quickly mold multiple injection molded gears with high consistency through the same mold, and complete the cutting, separation and ejection between products in an integrated manner.

[0006] The present invention is achieved through the following technical solutions:

[0007] The utility model proposes a rapid injection mold for a plastic gear, comprising an upper mold and a lower mold. Opposite sides of the upper mold and the lower mold are each provided with a plurality of cavities capable of forming an injection-molded gear after the two are relatively engaged. A guide groove is provided on the surface of the lower mold. The guide groove is connected to a plurality of diversion grooves respectively connected to the respective cavities. The respective cavities are connected through short grooves. A socket is provided through the bottom surface of the guide groove. A fixing plate is provided below the lower mold. An injection molding conduit is vertically fixed on the fixing plate. The injection molding conduit is plugged and connected in the socket.

[0008] Furthermore, a first movable plate is arranged parallel to the lower portion of the fixed plate, a number of right-angle cutters are fixed on the first movable plate, a number of right-angle through grooves are provided on the surface of the fixed plate, a number of right-angle cut grooves are provided on the surface of the lower mold, and two mutually perpendicular notch portions of the right-angle cut grooves respectively pass through the diversion groove and the short groove connected to the cavity; it also includes a driving mechanism, which can drive the first movable plate to move in the vertical direction, so that the right-angle cutters pass through the right-angle through grooves and the right-angle cut grooves to cut off the residual material in the diversion groove and the short groove.

[0009] Furthermore, a second movable plate is arranged parallel to the lower surface of the first movable plate, and a plurality of ejector rods are fixed on the upper surface of the second movable plate. A plurality of through holes are provided on the surfaces of the first movable plate and the fixed plate for the ejector rods to pass through. A plurality of ejector holes are provided in the cavity of the lower mold, and the ejector rods are plugged in and connected to the ejector holes.

[0010] Furthermore, the upper surface of the second movable plate has a protruding pad, and the driving mechanism is a cylinder fixed at the edge of the lower surface of the fixed plate. The telescopic end of the cylinder faces downward and is fixedly connected to the second movable plate. When the cylinder contracts, the pad is lifted on the lower surface of the first movable plate to enable the right-angle cutter to cut off the residual material in the diversion groove and the short groove, and when the cutting edge of the right-angle cutter is adjacent to the upper surface of the lower mold, the upper end of the ejector rod passes through the ejection hole and contacts the injection molded part in the cavity.

[0011] Furthermore, a first guide hole is provided on the surface of the first movable plate, and a first guide column is fixed on the upper surface of the second movable plate and is vertically slidably connected to the first guide hole; a second guide column is fixed on the upper surface of the first movable plate, and a second guide hole and a third guide hole are respectively provided on the surface of the fixed plate and the surface of the lower mold and are slidably connected to the second guide column.

[0012] Furthermore, it also includes a top seat, and the lower surface of the top seat is provided with a groove that can enable the upper mold to be embedded and fixed. Beneficial effects

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] The utility model optimizes the design of the cavity injection molding flow channel. The molten raw material enters the guide groove through the injection molding conduit and then enters each cavity through the diversion groove, so that the molten plastic is more evenly distributed in each cavity, and multiple injection molded gears can be quickly molded, while maintaining product consistency and improving product quality.

[0015] After the injection molding is completed, the cylinder contracts and drives the second movable plate upward. The pad contacts the lower surface of the first movable plate and lifts the first movable plate up. The first movable plate drives the right-angle cutter to move upward. The right-angle cutter enters the right-angle cutting groove and cuts off the residual material. When the cutting edge of the right-angle cutter is adjacent to the upper surface of the lower mold, the upper end of the ejector rod moves to contact the surface of the injection molded gear in the cavity. At this time, the upper mold moves upward for a distance driven by the top seat and separates from the lower mold and synchronously contracts the cylinder. The ejector rod ejects the injection molded gear, integrating the injection molding, cutting and ejection processes, and realizing the synchronous production and separation of multiple injection molded gears. The residual material of the separated injection molded gears is concentrated at the cutting point of the right-angle cutter, with less residual material, which is convenient for subsequent cleaning and shaping. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1It is a schematic diagram of the three-dimensional structure of the utility model;

[0017] Figure 2 yes Figure 1 The main perspective view;

[0018] Figure 3 It is a schematic diagram of the exploded structure of the lower mold, fixed plate, first movable plate, and second movable plate;

[0019] Figure 4 It is a top view of the lower die;

[0020] Figure 5 This is a schematic diagram of the top seat structure when viewed from above;

[0021] 1. Top seat; 11. Groove; 2. Upper mold; 3. Lower mold; 31. Guide groove; 32. Diverter groove; 33. Short groove; 34. Insert hole; 35. Right-angle cut groove; 36. Ejector hole; 37. Third guide hole; 4. Fixed plate; 41. Right-angle through groove; 42. Second guide hole; 5. First movable plate; 51. Right-angle cutter; 52. First guide hole; 53. Second guide post; 6. Second movable plate; 61. Ejector rod; 62. Spacer; 63. First guide post; 7. Cavity; 8. Injection tube; 9. Drive mechanism; 10. Through hole. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0023] A plastic gear rapid injection mold, please refer to Figure 1-4 , including a top base 1, an upper mold 2 and a lower mold 3. The lower surface of the top base 1 is provided with a groove 11 that allows the upper mold 2 to be fitted and fixed. Cavities 7 are provided on the opposite sides of the upper mold 2 and the lower mold 3. After the upper mold 2 and the lower mold 3 are relatively buckled together, the upper and lower cavities 7 form a complete structure to inject the gear.

[0024] A guide groove 31 is provided on the surface of the lower mold 3. The guide groove 31 is connected to a plurality of diverter grooves 32, each connected to each cavity 7. The individual cavities 7 are connected by short grooves 33. A socket 34 is provided through the bottom surface of the guide groove 31. A fixed plate 4 is provided below the lower mold 3. An injection tube 8 is vertically fixed on the fixed plate 4. The injection tube is plugged into the socket 34. During injection molding, the molten material enters the guide groove 31 through the injection tube 8 and then enters the various cavities 7 through the diverter grooves 32. This allows the molten plastic to be more evenly distributed to each cavity 7, maintaining the consistency of the injection molded gear and improving product quality. The short grooves 33 can keep the various cavities 7 connected, allowing the injection material to flow and fill quickly between the cavities 7, reducing excess material overflow.

[0025] Among them, the parting surface of the upper mold 2 and the lower mold 3 is located in the horizontal plane passing through the central axis of the injection molded gear. The two ends of the injection molded gear have protruding shafts for connection, and the connection between the diverter groove 32 and the cavity 7 is located at the shaft position; in addition, the short groove 33 is located between the end faces of the shaft, that is, by optimizing the position of the short groove 33 and the diverter groove 32, there will be no injection molding residue in the tooth part of the injection molded gear, thereby improving product quality.

[0026] A first movable plate 5 is arranged parallel to the fixed plate 4, and a plurality of right-angle cutters 51 are fixed on the first movable plate 5. A plurality of right-angle through grooves 41 are opened on the surface of the fixed plate 4, and a plurality of right-angle cutters 35 are opened on the surface of the lower mold 3. The two mutually perpendicular notch portions of the right-angle cutters 35 respectively pass through the diverter groove 32 and the short groove 33 connected to the cavity 7. The right-angle cutters 51 are used to cut off the residual material between the product and the diverter groove 32 and the short groove 33. After cutting, the residual material is small, which is convenient for cleaning;

[0027] In addition, it also includes a driving mechanism 9, which can be a device such as a cylinder, an electric cylinder, a linear module, etc. that can drive the first movable plate 5 to move in the vertical direction. The driving device enables the right-angle cutter 51 to pass through the right-angle through groove 41 and the right-angle cutting groove 35 to cut off the residual material in the diversion groove 32 and the short groove 33.

[0028] A second movable plate 6 is arranged parallel to the first movable plate 5, and a plurality of ejector rods 61 are fixed to the upper surface of the second movable plate 6. A plurality of through holes 10 for the ejector rods 61 to pass through are provided on the surfaces of the first movable plate 5 and the fixed plate 4. A plurality of ejector holes 36 are provided in the cavity 7 of the lower mold 3, and the ejector rods 61 are plugged in and connected to the ejector holes 36. The ejector rods 61 are used to eject the product from the cavity 7.

[0029] There is a protruding pad 62 on the upper surface of the second movable plate 6. When the driving mechanism 9 is a cylinder fixed at the edge of the lower surface of the fixed plate 4, the telescopic end of the cylinder faces downward and is fixedly connected to the second movable plate 6. When the cylinder contracts, the pad 62 is lifted on the lower surface of the first movable plate 5, so that the right-angle cutter 51 cuts off the residual material in the diverter groove 32 and the short groove 33, and when the cutting edge of the right-angle cutter 51 is adjacent to the upper surface of the lower mold 3, the upper end of the ejector rod 61 passes through the ejection hole 36 and moves to a position that contacts the injection molded part in the cavity 7.

[0030] A first guide hole 52 is defined on the surface of the first movable plate 5, and a first guide post 63 is fixed to the upper surface of the second movable plate 6, vertically slidingly connected to the first guide hole 52. A second guide post 53 is also fixed to the upper surface of the first movable plate 5. A second guide hole 42 and a third guide hole 37 are defined on the surfaces of the fixed plate 4 and the lower mold 3, respectively, to slideably connect to the second guide post 53. The first guide post 63 moves within the first guide hole 52, and the second guide post 53 moves within the second guide hole 42 and the third guide hole 37, thereby stabilizing and guiding the movement of the first and second movable plates 5 and 6.

[0031] Working principle: The upper mold 2 is fixed in the groove 11 of the top seat 1, and the third guide hole 37 of the lower mold 3 is aligned with the second guide column 53 and inserted to position the lower mold 3 above the fixed plate 4, and the upper mold 2 is moved to close the upper mold 2 and the lower mold 3. When in use, molten raw material is injected into the guide groove 31 through the injection molding conduit 8, and the molten raw material is introduced into each cavity 7 through each diversion groove 32; after injection molding is completed, the cylinder contracts and drives the second movable plate 6 upward, the pad contacts the lower surface of the first movable plate 5 and lifts the first movable plate 5 to move upward, and the first movable plate 5 drives the right-angle cutter 51 to move upward, and the right-angle cutter 51 enters the right-angle cutting groove 35 and cuts off the residual material; when the cutting edge of the right-angle cutter 51 is adjacent to the upper surface of the lower mold 3, the upper end of the ejector rod 61 is moved to contact the surface of the injection molded gear in the cavity 7. At this time, the upper mold 2 moves upward a distance driven by the top seat 1 and separates from the lower mold 3, and the cylinder is contracted synchronously, and the ejector rod 61 ejects the injection molded gear, integrating the injection molding, cutting and ejection processes, realizing the synchronous production and separation of multiple injection molded gears, and the residual material of the separated injection molded gears is concentrated at the cutting point of the right-angle cutter 51, with less residual material, which is convenient for subsequent cleaning and shaping.

[0032] The embodiments described above are merely descriptions of preferred embodiments of the present invention and are not intended to limit the concept and scope of the present invention. Any modifications and improvements to the technical solution of the present invention made by a person of ordinary skill in the art without departing from the design concept of the present invention shall fall within the scope of protection of the present invention. The technical content sought to be protected by the present invention is fully set forth in the claims.

Claims

1. A plastic gear rapid injection mold, comprising an upper mold and a lower mold, wherein the upper mold and the lower mold are each provided with a plurality of cavities on opposite sides thereof so as to form an injection molded gear after the upper mold and the lower mold are relatively engaged with each other, characterized in that: A guide groove is provided on the surface of the lower mold, and the guide groove is connected to a plurality of diversion grooves respectively connected to each cavity. The cavities are connected by short grooves, and a socket is provided on the bottom surface of the guide groove; a fixed plate is provided under the lower mold, and an injection molding conduit is vertically fixed on the fixed plate, and the injection molding conduit is plugged in and connected to the socket.

2. A plastic gear rapid injection mold according to claim 1, characterized in that: A first movable plate is arranged parallel to the lower portion of the fixed plate, and a plurality of right-angle cutters are fixed on the first movable plate. A plurality of right-angle through grooves are provided on the surface of the fixed plate, and a plurality of right-angle cut grooves are provided on the surface of the lower mold. The two mutually perpendicular notch portions of the right-angle cut grooves respectively pass through the diverter groove and the short groove connected to the mold cavity; and a driving mechanism is also included, which can drive the first movable plate to move in the vertical direction, so that the right-angle cutters pass through the right-angle through grooves and the right-angle cut grooves to cut off the residual material in the diverter groove and the short groove.

3. A plastic gear rapid injection mold according to claim 2, characterized in that: A second movable plate is arranged parallel to the lower side of the first movable plate, and a plurality of ejector rods are fixed on the upper surface of the second movable plate. A plurality of through holes are provided on the surfaces of the first movable plate and the fixed plate for the ejector rods to pass through. A plurality of ejector holes are provided in the cavity of the lower mold, and the ejector rods are plugged in and connected to the ejector holes.

4. A plastic gear rapid injection mold according to claim 3, characterized in that: The upper surface of the second movable plate is provided with a protruding pad, and the driving mechanism is a cylinder fixed at the edge of the lower surface of the fixed plate, the telescopic end of the cylinder faces downward and is fixedly connected to the second movable plate. When the cylinder contracts, the pad is lifted on the lower surface of the first movable plate to enable the right-angle cutter to cut off the residual material in the diversion groove and the short groove, and when the cutting edge of the right-angle cutter is adjacent to the upper surface of the lower mold, the upper end of the ejector rod passes through the ejection hole and contacts the injection molded part in the cavity.

5. The plastic gear rapid injection mold according to claim 3, characterized in that: A first guide hole is provided on the surface of the first movable plate, and a first guide column is fixed on the upper surface of the second movable plate and is vertically slidably connected to the first guide hole; a second guide column is fixed on the upper surface of the first movable plate, and a second guide hole and a third guide hole are respectively provided on the surface of the fixed plate and the surface of the lower mold and are slidably connected to the second guide column.

6. The rapid injection mold for plastic gears according to claim 1, characterized in that: It also includes a top seat, and a groove is provided on the lower surface of the top seat to enable the upper mold to be embedded and fixed.

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