Horn gate structure capable of saving cold runner

Abstract

The utility model discloses a cold runner saving horn gate structure which comprises a horn gate, a product and a glue injection channel, the horn gate is in the shape of a horn-shaped curved cone, the sectional dimension of the horn gate is gradually reduced, the front end gate of the horn gate is connected with the back face of the product, and the rear end gate of the horn gate is connected with the glue injection channel. The horn gate and the glue injection channel are communicated through a glue injection runner, the glue injection runner is designed to be in an arc shape, the glue injection runner horizontally extends to be provided with a first cold runner, and the joint of the first cold runner and the horn gate extends upwards to be provided with a thickening layer. And a second cold runner for stripping is vertically arranged at the position, close to the horn gate, of the first cold runner in a downward extending manner. According to the mode, the number of the cold runners is reduced, the position arrangement and the shape of the cold runners and the horn gates are changed, the horn gates can be smoothly ejected out, and the production cost is greatly reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molding, in particular to a cold runner saving bullhorn gate structure. Background Art

[0002] Many injection molded products are limited by shape, structural function and appearance requirements, and need to be injected from the back of the product, that is, bull horn gate molding. Bull horn injection is a common injection method in plastic injection molds. Usually, bull horn gates need to add more cold runners to assist ejection, such as Figure 1 and Figure 2 As shown, there are two cold runners extending in the horizontal direction and two cold runners extending at both ends in the vertical direction for material removal. Since the four cold runners are far away from the bull horn gate, the prior art requires four cold runners to realize the ejection of the bull horn gate, which is costly and the arrangement of the mold cavity will be increased, which often causes a great waste of cost, and the raw materials for each molding increase, the cost is relatively high.

[0003] Based on the above defects and shortcomings, it is necessary to improve the existing technology and design a cold runner-saving bullhorn gate structure. Utility Model Content

[0004] The main technical problem solved by the utility model is to provide a cold runner-saving bull-horn gate structure, reduce the number of cold runners, change the position arrangement and shape of the cold runner and the bull-horn gate, and be able to smoothly eject the bull-horn gate, thereby greatly reducing production costs.

[0005] In order to solve the above technical problems, a technical solution adopted by the utility model is: to provide a cold runner saving bull horn gate structure, the cold runner saving bull horn gate structure includes a bull horn gate, a product and a glue injection channel, the bull horn gate is shaped like a bull horn-shaped curved cone and its cross-sectional size gradually decreases, the front gate of the bull horn gate is connected to the back of the product, the rear gate of the bull horn gate is connected to the glue injection channel, the bull horn gate and the glue injection channel are connected through a glue injection runner, the glue injection runner has an arc design, compared with the original right-angle turn design, the arc design path is short, and the injection process is smooth, the glue injection runner is horizontally extended to provide a first cold runner, the connection between the first cold runner and the bull horn gate is extended upward to provide a thickening layer, the first cold runner extends downward vertically near the bull horn gate to provide a second cold runner for material removal.

[0006] Preferably, the rear gate of the bull horn gate is tangent to the first cold runner in a vertical direction.

[0007] Preferably, an R angle is added at the connection between the rear end gate of the bull horn gate and the first cold runner.

[0008] Preferably, the height H of the second cold runner is higher than the center arc length L of the bull horn gate.

[0009] Preferably, a groove for facilitating material removal is provided at the lower end of the second cold runner, and an ejector pin for material removal is provided below the second cold runner, and a boss cooperating therewith is provided on the ejector pin.

[0010] Compared with the prior art, the beneficial effects of the utility model are:

[0011] Two cold runners are set up close to the bull horn gate, which reduces the number of cold runners, changes the position arrangement and shape of the cold runner and bull horn gate, and greatly reduces production costs;

[0012] The thickened layer is the thickest and has not yet completely cooled, so it will deform and cause the bull-horn gate to be ejected smoothly.

[0013] The bull-horn gate should be tangent to the cold runner and increase the R angle. The stripping force point acts on the bull-horn gate. The corner strength is good and it is not easy to break when stripping.

[0014] The arc design of the injection flow channel is shorter than the original right-angle turning design, and the injection process is smoother; BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a cross-sectional view of the existing four-section cold runner bullhorn gate.

[0016] Figure 2 This is a top view of the existing four-section cold runner horn gate.

[0017] Figure 3 It is a structural schematic diagram of a cold runner-saving bullhorn gate structure.

[0018] Figure 4 A partial side view of a cold runner-saving bullhorn gate structure.

[0019] Figure 5 This is a partial bottom view of a cold runner-saving bullhorn gate structure.

[0020] Figure 6 A partial cross-sectional view of a cold runner-saving bullhorn gate structure.

[0021] Among them, 1. bull horn gate, 2. product, 3. injection channel, 4. injection runner, 5. first cold runner, 50. thickening layer, 6. second cold runner, 60. groove, 7. ejector pin, 70. boss. DETAILED DESCRIPTION

[0022] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0023] See also Figures 3 to 6 , the utility model embodiment includes:

[0024] A cold runner-saving bullhorn gate structure, the cold runner-saving bullhorn gate structure comprises a bullhorn gate 1, a product 2, a glue injection channel 3, a glue injection runner 4, a first cold runner 5, a second cold runner and an ejector pin 7, the bullhorn gate 1 is shaped like a curved cone of a bull horn and its cross-sectional size gradually decreases, the front gate of the bullhorn gate 1 is connected to the back of the product 2, the rear gate of the bullhorn gate 1 is connected to the glue injection channel 3, the bullhorn gate 1 and the glue injection channel 3 are connected through the glue injection runner 4, the glue injection The arc design of the runner 4 is shorter than the original right-angle turn design, and the injection process is smoother. The injection runner 4 is horizontally extended with a first cold runner 5, and a thickening layer 50 is extended upward at the connection between the first cold runner 5 and the bull horn gate 1. When removing the material, because the glue position at the thickening layer 50 is the thickest and has not been completely cooled, it will deform here, so that the bull horn gate 1 is smoothly ejected. The first cold runner 5 extends vertically downward near the bull horn gate 1 to have a second cold runner 6 for removing the material.

[0025] The rear gate of the bull horn gate 1 is tangent to the first cold runner 5 in the vertical direction. When the ejector is pushed up to demould, the lifting force acts on the bull horn gate 1 to ensure smooth demoulding. An R corner is added at the connection between the rear gate of the bull horn gate 1 and the first cold runner 5, and the corner strength is good, which is not easy to be pulled apart during demoulding.

[0026] The height H of the second cold runner 6 is higher than the center arc length L of the bull horn gate. When demolding, the product 2 can only be demolded when the bull horn gate 1 is completely demolded. The demolding path of the bull horn gate 1 is the center arc length of the bull horn gate.

[0027] A groove 60 for facilitating material removal is disposed at the lower end of the second cold runner 6 , and an ejector pin 7 for material removal is disposed below the second cold runner 6 , and a boss 70 cooperating therewith is disposed on the ejector pin 7 .

[0028] The utility model discloses a cold runner-saving bullnose gate structure, reduces the number of cold runners, changes the position arrangement and shape of the cold runner and the bullnose gate, can smoothly eject the bullnose gate, and greatly reduces the production cost.

[0029] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A cold runner-saving bullhorn gate structure, comprising a bullhorn gate (1), a product (2) and a glue injection channel (3), wherein the bullhorn gate (1) is shaped like a curved cone of a bullhorn and its cross-sectional size gradually decreases, the front gate of the bullhorn gate (1) is connected to the back of the product (2), and the rear gate of the bullhorn gate (1) is connected to the glue injection channel (3), characterized in that: The bull horn gate (1) and the injection channel (3) are connected through a glue injection runner (4); the glue injection runner (4) is designed as an arc; the glue injection runner (4) is horizontally extended with a first cold runner (5); a thickening layer (50) is extended upward at the connection between the first cold runner (5) and the bull horn gate (1); and the first cold runner (5) is vertically extended downward near the bull horn gate (1) to form a second cold runner (6) for stripping.

2. The cold runner-saving bullhorn gate structure according to claim 1, characterized in that: The rear gate of the bullhorn gate (1) is tangent to the first cold runner (5) in the vertical direction.

3. The cold runner-saving bullnose gate structure according to claim 1, characterized in that: An R angle is added at the connection between the rear end gate of the bullhorn gate (1) and the first cold runner (5).

4. The cold runner-saving bullhorn gate structure according to claim 1, characterized in that: The height H of the second cold runner (6) is greater than the center arc length L of the bullhorn gate.

5. The cold runner-saving bullhorn gate structure according to claim 1, characterized in that: The lower end of the second cold runner (6) is provided with a groove (60) for facilitating material removal, and a ejector pin (7) for material removal is provided below the second cold runner (6), and a boss (70) cooperating therewith is provided on the ejector pin (7).

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