Sprue structure of runner-free injection mold

Abstract

The utility model relates to the technical field of injection molds, in particular to a sprue structure of a runner-free injection mold. The device comprises a fixing plate, the fixing plate is arranged in a hollow shape, a main flow pipe is vertically and upwards arranged in the middle of the upper surface of the fixing plate, the main flow pipe is communicated with the hollow portion of the fixing plate, a plurality of round pipes are arranged on the periphery of the main flow pipe, the ends of the round pipes are closed, and the round pipes are located above the fixing plate. The round pipe is communicated with the hollow part of the fixed plate, a flow dividing pipe which is vertically arranged downwards is arranged below the fixed plate corresponding to the round pipe, the end part of the flow dividing pipe penetrates through the lower surface of the fixed plate and extends into the fixed plate, and the tail end of a sprue of each flow dividing pipe is communicated with a forming cavity of a product. The device solves the problem of waste of injection molding raw materials.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molds, in particular to a gate structure of a flow channel-free injection mold. Background Art

[0002] Injection molds are tools for producing plastic products and are widely used.

[0003] In the prior art, since there is a gate between the injection nozzle and the mold cavity, a gate handle will be formed at the gate during the injection molding process. The existence of the gate handle not only wastes injection molding materials, but also increases the workload of manually cutting the gate handle in the later stage. Utility Model Content

[0004] In order to solve the problems in the related art, the utility model provides a gate structure of a runner-free injection mold, and the device solves the problem of wasting injection raw materials.

[0005] In order to solve the above problems, the following technical solutions are provided:

[0006] The utility model provides a gate structure of a runnerless injection mold, which includes a fixed plate, which is arranged in a hollow shape, and a main flow pipe is vertically upwardly arranged in the middle of the upper surface of the fixed plate, and the main flow pipe is connected with the hollow part of the fixed plate. A plurality of circular tubes are arranged around the main flow pipe, and the ends of the circular tubes are closed. The circular tubes are located above the fixed plate, and the circular tubes are connected with the hollow part of the fixed plate. A diversion pipe arranged vertically downward is arranged below the fixed plate corresponding to the circular tube, and the end of the diversion pipe penetrates the lower surface of the fixed plate and extends into the inside of the fixed plate, and the gate end of each diversion pipe is connected with the molding cavity of the product.

[0007] In the above scheme, the injection molding raw material is first quickly injected from the main pipe into the cavity of the fixed plate, and then enters each branch pipe, and is continuously injected into the product molding cavity through the gate. The main pipe and the branch pipe are arranged vertically downward, and the injection molding raw material is diverted in the cavity of the fixed plate. The setting without runners avoids the coagulation of plastic raw materials in the runners, thereby solving the problem of waste of injection molding raw materials.

[0008] An air intake device is arranged on one side of the fixing plate, and a plurality of air outlet pipes are connected to the air intake device, and the air outlet pipes are communicated with each circular pipe.

[0009] In the above scheme, the air intake device is provided to increase the fluidity of the injection molding material and avoid blockage, so that the high-temperature injection molding material can quickly enter the molding cavity of the product under high pressure.

[0010] The cross section of the flow diversion channel in the flow diversion pipe is circular, and the gate is arranged in a conical shape.

[0011] In the above scheme, the gate is set in a tapered shape, which effectively prevents the uncooled and solidified plastic product from flowing back and maintains the shape and dimensional stability of the plastic product.

[0012] A sealing ring is arranged on the inner surface of the fixing plate.

[0013] In the above scheme, the sealing ring is provided to maintain good sealing performance and prevent leakage of injection molding raw materials.

[0014] The end of the main flow pipe is provided with a feed inlet.

[0015] In the above scheme, the feed port is provided for feeding.

[0016] The above solution has the following advantages:

[0017] 1. A gate structure of a runner-free injection mold of the utility model includes a fixed plate, which is arranged in a hollow shape, and a main flow pipe is vertically arranged upward in the middle of the upper surface of the fixed plate, and the main flow pipe is connected to the hollow part of the fixed plate. A plurality of circular tubes are arranged around the main flow pipe, and the ends of the circular tubes are closed. The circular tubes are located above the fixed plate, and the circular tubes are connected to the hollow part of the fixed plate. A diverter pipe arranged vertically downward is arranged below the fixed plate corresponding to the circular tube, and the end of the diverter pipe passes through the lower surface of the fixed plate and extends to the inside of the fixed plate. The gate end of each diverter pipe is connected to the molding cavity of the product. The injection molding raw material is first quickly injected from the main flow pipe into the cavity of the fixed plate, and then enters each diverter pipe, so as to be continuously injected into the molding cavity of the product through the gate. The main flow pipe and the diverter pipe are arranged vertically downward, and the injection molding raw material is diverted in the cavity of the fixed plate. Through the runner-free setting, the plastic raw material in the runner is avoided from agglomerating, thereby saving the injection molding raw material.

[0018] 2. An air intake device is provided on one side of the fixed plate to increase the fluidity of the injection molding raw materials and avoid blockage, so that the high-temperature injection molding raw materials can quickly enter the molding cavity of the product under high pressure. The cross-section of the diverter channel in the diverter pipe is circular, and the gate is arranged in a conical shape, which effectively prevents the backflow of uncooled and solidified plastic products and maintains the shape and dimensional stability of the plastic products. A sealing ring is provided on the inner surface of the fixed plate to maintain good sealing performance and prevent leakage of injection molding raw materials. A feed port is provided at the end of the main pipe for feeding. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the gate structure of a runner-free injection mold;

[0020] Figure 2 It is an enlarged schematic diagram of the gate structure A of a runner-free injection mold;

[0021] Figure 3 A top view of a gate structure of a runnerless injection mold;

[0022] Figure 4 A bottom view of a gate structure of a runnerless injection mold;

[0023] Explanation of the reference numerals: 1. fixed plate; 2. main pipe; 3. round pipe; 4. branch pipe; 5. gate; 6. air inlet device; 7. air outlet pipe; 8. sealing ring; 9. feed port. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] like Figures 1 to 4 As shown, a gate structure of a runner-free injection mold of the utility model includes a fixed plate 1, which is arranged in a hollow shape, and a main flow pipe 2 is vertically arranged upward in the middle of the upper surface of the fixed plate 1, and a feed port 9 is arranged at the end of the main flow pipe 2, and the main flow pipe 2 is connected to the hollow part of the fixed plate 1. A plurality of circular tubes 3 are arranged around the main flow pipe 2, and the ends of the circular tubes 3 are closed. The circular tubes 3 are located above the fixed plate 1, and the circular tubes 3 are connected to the hollow part of the fixed plate 1. A diverter pipe 4 arranged vertically downward is arranged below the fixed plate 1 corresponding to the circular tube 3, and the end of the diverter pipe 4 passes through the lower surface of the fixed plate 1 and extends to the inside of the fixed plate 1, and the end of the gate 5 of each diverter pipe 4 is connected to the molding cavity of the product, and the main flow pipe 2 and the diverter pipe 4 are arranged vertically downward, and the injection molding raw material is diverted in the cavity of the fixed plate 1. Through the runner-free setting, the plastic raw material agglomeration in the runner is avoided, thereby solving the problem of waste of injection molding raw materials.

[0026] An air inlet device 6 is provided on one side of the fixed plate 1, and a plurality of air outlet pipes 7 are connected to the air inlet device 6, and the air outlet pipes 7 are connected to each round tube 3. The air inlet device 6 is provided to increase the fluidity of the injection molding material and avoid blockage, so that the high-temperature injection molding material can quickly enter the molding cavity of the product under high pressure.

[0027] The cross section of the shunt channel in the shunt pipe 4 is circular, and the gate 5 is arranged in a conical shape, which effectively prevents the uncooled and solidified plastic product from flowing back and maintains the shape and dimensional stability of the plastic product.

[0028] A sealing ring 8 is provided on the inner surface of the fixing plate 1 to maintain good sealing performance and prevent leakage of injection molding raw materials.

[0029] First, the injection molding raw material is quickly injected into the main flow pipe 2 from the feed port 9, and the injection molding raw material flows vertically downward from the main flow pipe 2 into the cavity of the fixed plate 1. A part of the injection molding raw material is diverted to each diversion pipe 4 due to gravity, and the other part of the injection molding raw material is introduced into the round tube 3 through the air intake device 6, which increases the fluidity of the injection molding raw material. A small amount of residual injection molding raw material can be blown by the flowing gas to flow into each diversion pipe 4, and finally continuously injected into the molding cavity of the product through the gate 5. After cooling and curing, demolding is carried out to obtain the product.

[0030] In the description of the present utility model, it should be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In the description of the present utility model, unless otherwise specified and limited, it should be noted that the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a mechanical connection or an electrical connection, or it can be the internal communication of two elements, it can be a direct connection, or it can be an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0031] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A gate structure of a runnerless injection mold, characterized in that: The invention comprises a fixed plate (1), wherein the fixed plate (1) is arranged in a hollow shape, a main flow pipe (2) is arranged vertically upward in the middle of the upper surface of the fixed plate (1), the main flow pipe (2) is connected to the hollow part of the fixed plate (1), a plurality of circular tubes (3) are arranged around the main flow pipe (2), the ends of the circular tubes (3) are closed, the circular tubes (3) are located above the fixed plate (1), the circular tubes (3) are connected to the hollow part of the fixed plate (1), a diverter pipe (4) arranged vertically downward is arranged below the fixed plate (1) corresponding to the circular tube (3), the end of the diverter pipe (4) passes through the lower surface of the fixed plate (1) and extends into the interior of the fixed plate (1), and the end of the gate (5) of each diverter pipe (4) is connected to the molding cavity of the product.

2. A gate structure of a runnerless injection mold according to claim 1, characterized in that: An air intake device (6) is provided on one side of the fixed plate (1), and a plurality of air outlet pipes (7) are connected to the air intake device (6), and the air outlet pipes (7) are in communication with each circular tube (3).

3. A gate (5) structure of a runnerless injection mold according to claim 1, characterized in that: The cross section of the flow diversion channel in the flow diversion pipe (4) is circular, and the gate (5) is arranged in a conical shape.

4. A gate structure of a runnerless injection mold according to claim 1, characterized in that: A sealing ring (8) is provided on the inner surface of the fixing plate (1).

5. The gate structure of a runnerless injection mold according to claim 1, characterized in that: A feed port (9) is provided at the end of the main flow pipe (2).

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