Injection mold capable of rapidly filling cavity

Abstract

The utility model relates to an injection mold capable of quickly filling a cavity, and belongs to the technical field of injection molds. Comprising a top plate, a fixed mold plate, a movable mold plate, a foot plate and a bottom plate which are sequentially arranged, a forming cavity is formed between the fixed mold plate and the movable mold plate, a demolding mechanism is arranged on the inner side of the foot plate, an injection molding opening is formed in the top plate, a storage cavity connected with the injection molding opening is formed in the fixed mold plate, and a feeding hole is formed in the bottom of the storage cavity and connected with the forming cavity; a telescopic rod for blocking the feeding hole is arranged in the movable mold plate, a hydraulic cylinder for controlling the telescopic rod to stretch out and draw back is arranged at the bottom of the telescopic rod, the hydraulic cylinder is fixedly connected with the demolding mechanism, and a pressure sensor is arranged at the bottom of the storage cavity; according to the scheme, plastic melt injected into the mold is firstly stored in the storage cavity, the storage cavity plays a role in storage and pressurization, after the feeding hole in the bottom communicates with the forming cavity, the pressurized melt can rapidly enter the forming cavity, and the time for filling the forming cavity with the melt is shortened.

Description

Technical Field

[0001] The utility model belongs to the technical field of injection molds and relates to an injection mold for quickly filling a mold cavity. Background Art

[0002] Most plastic products are manufactured by mold injection molding. Injection molding is a process in which the plastic raw materials are heated to a molten state and then the molten plastic is injected into a mold through a feeding mechanism. A molding cavity is provided in the mold to form the corresponding product structure. When the molten plastic fills the molding cavity, the molten plastic in the molding cavity is cooled to form the raw materials inside into a plastic product. The mold is then opened by a mold opening mechanism and a demolding mechanism to release the product in the molding cavity from the mold.

[0003] However, the injection molds in the prior art still have some shortcomings. During the injection molding process, the feeding mechanism generates pressure to inject the plastic melt into the molding cavity. Therefore, the externally applied pressure has a direct impact on the speed at which the melt fills the molding cavity. Rapidly filling the molding cavity with the melt can improve production efficiency, while also reducing the cooling of the melt during the filling process and improving the fluidity of the melt in the molding cavity. Summary of the invention

[0004] The utility model aims at the problems existing in the prior art and proposes an injection mold for quickly filling the cavity. The technical problem to be solved by the utility model is: how to increase the speed of filling the molding cavity with injection molding raw materials.

[0005] The purpose of the utility model can be achieved through the following technical solutions: an injection mold for quickly filling a cavity, comprising a top plate, a fixed template, a movable template, a foot plate and a bottom plate arranged in sequence, a molding cavity is provided between the fixed template and the movable template, a demolding mechanism is provided on the inner side of the foot plate, an injection port is provided on the top plate, a storage cavity connected to the injection port is provided inside the fixed template, a feed hole is provided at the bottom of the storage cavity, the feed hole is connected to the molding cavity, a telescopic rod for blocking the feed hole is provided inside the movable template, a hydraulic cylinder for controlling the extension and retraction of the telescopic rod is provided at the bottom of the telescopic rod, the hydraulic cylinder is fixedly connected to the demolding mechanism, and a pressure sensor is provided at the bottom of the storage cavity.

[0006] In this scheme, the molding cavity is the space between the movable mold plate and the fixed mold plate for forming the injection molded product. The plastic melt enters the storage cavity at the bottom from the injection port. Since the feed hole at the bottom of the storage cavity is blocked by the telescopic rod, the plastic melt will be stored in the storage cavity. Since the external plastic melt is continuously injected into the storage cavity, the pressure in the storage cavity will continue to increase. When the internal pressure reaches a predetermined value, the pressure sensor will transmit a signal to the hydraulic cylinder. The hydraulic cylinder controls the telescopic rod to move so that the feed hole is connected with the molding cavity at the bottom. The plastic melt in the storage cavity is quickly injected into the molding cavity under the action of pressure, and the molding cavity is quickly filled. After cooling and molding, the molded product is ejected from the molding cavity by the demolding mechanism. In the above manner, the plastic melt injected into the mold is first stored in the storage cavity, and the storage cavity plays the role of storage and pressurization. When the feed hole at the bottom is connected with the molding cavity, the pressurized melt can quickly enter the molding cavity, shortening the time for the melt to fill the molding cavity and reducing the impact of temperature loss on the fluidity of the melt.

[0007] In the above-mentioned injection mold for rapidly filling the mold cavity, the demoulding mechanism includes an upper push plate and a lower push plate, the upper push plate is provided with a plurality of fixedly connected straight push rods, the tops of the straight push rods are connected to the molding cavity, and the hydraulic cylinder is fixedly connected to the lower push plate in the demoulding mechanism. During the demoulding process, the lower push plate will be pushed upward, and the lower push plate will drive the upper push plate and the straight push rods to move together, and the straight push rods will move upward and extend from the upper surface of the movable mold plate to eject the product from the molding cavity and demould.

[0008] In the above-mentioned injection mold for rapidly filling the cavity, an inclined ejector block is provided in the movable mold plate, a fixedly connected inclined ejector rod is provided at the bottom of the inclined ejector block, a slide seat is provided inside the upper push plate, and the slide seat is fixedly connected to the lower push plate. The inclined ejector block and the inclined ejector rod cooperate to eject the product obliquely, and the inclined ejector rod cooperates with the straight ejector rod to better eject the product from the mold.

[0009] In the above-mentioned injection mold for rapidly filling the cavity, a slide rail is provided inside the slide seat, a sliding block is provided inside the slide rail, and a pin is provided at the bottom of the inclined ejector rod, and the inclined ejector rod is hingedly connected to the slide seat through the cooperation of the pin and the sliding block. Since the inclined ejector rod moves obliquely in the movable mold plate, it needs to be hingedly connected to the slide seat, and the angle between the inclined ejector rod and the upper push plate can change during the upward movement of the lower push plate.

[0010] In the above-mentioned injection mold for rapidly filling the cavity, the movable mold plate is provided with a fixed guide column, the fixed mold plate is provided with a guide sleeve, the guide column and the guide sleeve are slidably connected. The guide column and the guide sleeve cooperate to play a guiding role in the process of mold opening and closing.

[0011] In the above-mentioned injection mold for rapidly filling the mold cavity, the movable mold plate and the fixed mold plate are provided with a plurality of cooling channels, and the cooling channels are provided on the upper and lower sides of the molding cavity. The cooling liquid flows into the cooling channels, so that the inside of the molding cavity can be cooled quickly, the cooling speed of the plastic melt is increased, and the efficiency of injection molding is improved.

[0012] Compared with the prior art, the utility model has the following advantages:

[0013] 1. In this scheme, the plastic melt injected into the mold is first stored in the storage cavity, which plays the role of storage and pressurization. When the feed hole at the bottom is connected to the molding cavity, the pressurized melt can quickly enter the molding cavity, shortening the time for the melt to fill the molding cavity.

[0014] 2. In this solution, when the internal pressure in the storage chamber reaches a predetermined value, the pressure sensor transmits a signal to the hydraulic cylinder, and the hydraulic cylinder controls the movement of the telescopic rod to connect the feed hole with the molding chamber at the bottom. At the same time, the pressure sensor can also prevent the melt pressure in the storage chamber from being too high. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0016] Figure 2 It is a front structural schematic diagram of the utility model;

[0017] Figure 3 This utility model Figure 2 Schematic diagram of the cross-section structure at A- in the middle;

[0018] Figure 4 This utility model Figure 2 Schematic diagram of the cross-section structure at BB in the middle;

[0019] Figure 5 It is a schematic diagram of the explosion structure of the inclined push rod of the utility model.

[0020] In the figure, 1, top plate; 1a, injection port; 1b, storage cavity; 1b1, pressure sensor; 1b2, feed hole; 2, fixed template; 2a, guide sleeve; 3, movable template; 3a, guide column; 4, foot plate; 4a, upper push plate; 4b, lower push plate; 4c, straight push rod; 5, bottom plate; 6, molding cavity; 7, telescopic rod; 7a, hydraulic cylinder; 8, inclined ejector block; 8a, inclined ejector rod; 8b, pin shaft; 9, slide seat; 9a, slide rail; 9a1, slider; 10, cooling channel. DETAILED DESCRIPTION

[0021] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0022] Example

[0023] like Figure 1 As shown, an injection mold for quickly filling a cavity comprises a top plate 1, a fixed mold plate 2, a movable mold plate 3, a foot plate 4 and a bottom plate 5 arranged in sequence, an upper push plate 4a and a lower push plate 4b are provided on the inner side of the foot plate 4 for reciprocating movement, the upper push plate 4a and the lower push plate 4b are fixedly connected, and an injection port 1a is provided on the top plate 1.

[0024] like Figure 3 As shown, a molding cavity 6 for injection molding is provided between the fixed mold plate 2 and the movable mold plate 3, a storage cavity 1b is provided inside the fixed mold plate 2, and the storage cavity 1b is connected to the injection port 1a, a feed hole 1b2 is provided at the bottom of the molding cavity 6, and the bottom of the feed hole 1b2 is connected to the molding cavity 6, a telescopic rod 7 for blocking is provided below the feed hole 1b2, the bottom of the telescopic rod 7 passes through the movable mold plate 3, and is fixedly connected to a hydraulic cylinder 7a provided on the lower push plate 4b, and the hydraulic cylinder 7a is fixedly connected to the lower push plate 4b, a straight push rod 4c and an inclined push block 8 are provided inside the movable mold plate 3, the bottom of the straight push rod 4c is fixedly connected to the upper push plate 4a, a fixed inclined push rod 8a is provided below the inclined push block 8, and the inclined push rod 8a extends obliquely inside the movable mold plate 3.

[0025] like Figure 4 As shown, the movable template 3 is provided with a fixed guide column 3a, the fixed template 2 is provided with a guide sleeve 2a, the guide column 3a is slidably connected to the guide sleeve 2a, the movable template 3 is fixedly connected to the foot plate 4, and the top plate 1 is fixedly connected to the fixed template 2.

[0026] like Figure 3 As shown in combination 5, a fixed slide seat 9 is provided on the push plate 4b, slide rails 9a are provided on both sides of the slide seat 9, a sliding block 9a1 is provided inside the slide rail 9a for sliding connection, and a pin shaft 8b is provided at the bottom of the inclined push rod 8a. The pin shaft 8b cooperates with the sliding block 9a1 so that the bottom of the inclined push rod 8a is hingedly connected to the slide seat 9.

[0027] The working principle of this scheme is as follows: Figure 1-5As shown, after the mold is closed, the hydraulic cylinder 7a controls the telescopic rod 7 to extend and seal the bottom of the feed hole 1b2. The external feed mechanism heats the plastic raw material to a molten state and injects it into the mold from the injection port 1a. The plastic melt will be stored in the storage cavity 1b. As the external plastic melt is continuously injected into the storage cavity 1b, the pressure in the storage cavity 1b will continue to increase. When the internal pressure reaches a predetermined value, the pressure sensor 1b1 will transmit a signal to the hydraulic cylinder 7a, and the hydraulic cylinder 7a controls the telescopic rod 7 to move downward, so that the feed hole 1b2 is filled. The hole 1b2 is connected to the molding cavity 6 at the bottom. The plastic melt in the storage cavity 1b is quickly injected into the molding cavity 6 under the action of pressure to quickly fill the molding cavity 6. After the filling is completed, coolant flows into the cooling channel to cool the mold so that the product in the molding cavity 6 can be quickly cooled and molded. The mold is then opened by the mold opening mechanism, and the upper push plate 4a and the lower push plate 4b are pushed, so that the straight push rod 4c and the inclined push rod 8a are simultaneously extended from the inside of the movable template 3, and the product in the molding cavity 6 is ejected and demolded, completing the manufacture of the injection molding product.

[0028] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0029] Although this article uses more terms such as 1, top plate; 1a, injection port; 1b, storage cavity; 1b1, pressure sensor; 1b2, feed hole; 2, fixed template; 2a, guide sleeve; 3, movable template; 3a, guide column; 4, foot plate; 4a, upper push plate; 4b, lower push plate; 4c, straight push rod; 5, bottom plate; 6, molding cavity; 7, telescopic rod; 7a, hydraulic cylinder; 8, inclined ejector block; 8a, inclined ejector rod; 8b, pin shaft; 9, slide seat; 9a, slide rail; 9a1, slider; 10, cooling channel, etc., it does not exclude the possibility of using other terms. The use of these terms is only to more conveniently describe and explain the essence of the utility model; interpreting them as any additional restrictions is contrary to the spirit of the utility model.

Claims

1. An injection mold for rapidly filling a mold cavity, comprising a top plate (1), a fixed mold plate (2), a movable mold plate (3), a foot plate (4) and a bottom plate (5) arranged in sequence, a molding cavity (6) being provided between the fixed mold plate (2) and the movable mold plate (3), a demoulding mechanism being provided on the inner side of the foot plate (4), an injection port (1a) being provided on the top plate (1), characterized in that: The fixed template (2) is provided with a storage cavity (1b) connected to the injection port (1a), the storage cavity (1b) is provided with a feed hole (1b2) at the bottom, the feed hole (1b2) is connected to the molding cavity (6), the movable template (3) is provided with a telescopic rod (7) for blocking the feed hole (1b2), the bottom of the telescopic rod (7) is provided with a hydraulic cylinder (7a) for controlling the telescopic rod (7), the hydraulic cylinder (7a) is fixedly connected to the demoulding mechanism, and the bottom of the storage cavity (1b) is provided with a pressure sensor (1b1).

2. The injection mold for rapidly filling a cavity according to claim 1, characterized in that: The demoulding mechanism comprises an upper push plate (4a) and a lower push plate (4b), the upper push plate (4a) is provided with a plurality of fixedly connected straight push rods (4c), the tops of the straight push rods (4c) are connected to the molding cavity (6), and the hydraulic cylinder (7a) is fixedly connected to the lower push plate (4b) in the demoulding mechanism.

3. The injection mold for rapidly filling a cavity according to claim 2, characterized in that: The movable template (3) is provided with an inclined ejector block (8), the bottom of the inclined ejector block (8) is provided with a fixed inclined ejector rod (8a), the upper push plate (4a) is provided with a sliding seat (9), and the sliding seat (9) is fixedly connected to the lower push plate (4b).

4. The injection mold for rapidly filling a cavity according to claim 3, characterized in that: A slide rail (9a) is provided inside the slide seat (9), a sliding block (9a1) is provided inside the slide rail (9a) for sliding connection, a pin shaft (8b) is provided at the bottom of the inclined push rod (8a), and the pin shaft (8b) cooperates with the sliding block (9a1) to enable the inclined push rod (8a) to be hingedly connected to the slide seat (9).

5. The rapid cavity filling injection mold according to claim 1, characterized in that: The movable platen (3) is provided with a fixed guide column (3a), the fixed platen (2) is provided with a guide sleeve (2a), and the guide column (3a) is slidably connected to the guide sleeve (2a).

6. The rapid cavity filling injection mold according to claim 1, characterized in that: A plurality of cooling channels (10) are provided on the movable die plate (3) and the fixed die plate (2), and the cooling channels (10) are arranged on the upper and lower sides of the molding cavity (6).

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