Gas cap demolding structure for inspecting covering cap

Abstract

The utility model belongs to the technical field of dies. The problem that in the prior art, the demolding effect of a threaded cover is poor is solved. The gas cap demolding structure comprises a ventilation channel penetrating through the bottom wall of an upper cavity of a movable mold, a ventilation pipe connected with the movable mold is arranged in the ventilation channel, a valve rod capable of ascending and descending relative to the movable mold is vertically arranged in the ventilation channel, the valve rod is sleeved with an elastic piece, and the upper end and the lower end of the elastic piece abut against the movable mold and the valve rod respectively. The upper end of the valve rod is in an inverted circular truncated cone shape, under the action of the elastic piece, the upper end of the valve rod abuts against the inner wall of the upper end opening of the ventilation channel and seals the upper end opening of the ventilation channel, the lower end of the valve rod abuts against the air outlet end of the ventilation pipe and seals the air outlet of the ventilation pipe, and the upper end face of the valve rod is flush with the edge of the upper end opening of the ventilation channel. The demoulding device has the advantage that the demoulding effect of the threaded cover can be improved so as to increase the yield.

Description

Technical Field

[0001] This utility model belongs to the field of mold technology and relates to an air-cushion demolding structure for an inspection port cover. Background Technology

[0002] Currently, threaded caps are manufactured through injection molding using molds. Specifically, during the manufacturing process, the moving mold and the fixed mold of the mold fit together to form a cavity. The injection molding material is then injected into the cavity, filling it completely. After cooling and solidification, the threaded cap is formed. During demolding, the cylinder on the mold moves the upper mold base upward via the piston rod. Simultaneously, the motor on the mold drives the rotating shaft to rotate, causing the threaded core to rotate. This allows the cap to be ejected by rotating the threads (i.e., unscrewing). However, during the rotational demolding process, due to the tight fit between the bottom wall of the cavity and the threaded cap, excessive negative pressure often occurs at the contact point due to poor venting. This makes the rotational demolding process difficult, time-consuming, and labor-intensive, and can easily damage the threads on the cap, resulting in defective products. Summary of the Invention

[0003] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing an air-pump demolding structure for inspection caps. The technical problem this invention aims to solve is how to improve the demolding effect of threaded caps to increase yield.

[0004] The objective of this utility model can be achieved through the following technical solutions:

[0005] An air-jacking demolding structure for an inspection port cover, the mold including a moving mold, characterized in that the air-jacking demolding structure includes a ventilation channel penetrating the bottom wall of the upper cavity of the moving mold, a ventilation pipe connected to the moving mold and a valve rod vertically arranged and movable relative to the moving mold are provided in the ventilation channel, an elastic element is sleeved on the valve rod, the upper and lower ends of the elastic element abut against the moving mold and the valve rod respectively, the upper end of the valve rod is in the shape of an inverted frustum, and under the action of the elastic element, the upper end of the valve rod abuts against the inner wall of the upper port of the ventilation channel and closes the upper port of the ventilation channel, the lower end of the valve rod abuts against the air outlet end of the ventilation pipe and closes the air outlet of the ventilation pipe, and the upper end face of the valve rod is flush with the edge of the upper port of the ventilation channel.

[0006] The upper end face of the valve stem in the air-pump demolding structure of this inspection port cover is flush with the edge of the upper port of the ventilation channel. At the same time, the upper end of the valve stem abuts against the edge of the upper port of the ventilation channel and closes the upper port of the ventilation channel. This allows the mold cavity to retain its original shape and function during the molding process when the mold is closed. When the mold is opened, the airflow from the external air source through the ventilation pipe will push the valve stem upward and compress the elastic element. The ventilation pipe can better guide the external airflow to the bottom of the valve stem to better push the valve stem upward. After the valve stem moves upward, it will open the upper port of the ventilation channel. Then the airflow will flow along the ventilation channel to the cavity, thereby relieving the negative pressure problem inside the cavity and improving the demolding effect of the threaded cover to increase the yield.

[0007] In the aforementioned air-jacking demolding structure for an inspection port cover, both the ventilation channel and the ventilation pipe are L-shaped. The outlet end of the ventilation pipe is cylindrical, and its inlet end extends out of the side wall of the moving mold. The lower end of the valve stem is located within the edge of the outlet of the ventilation pipe. This allows the air source to enter from the side wall of the mold, making it more convenient to use. Simultaneously, the lower end of the valve stem, located within the edge of the outlet of the ventilation pipe, guides and limits the movement of the valve stem, resulting in more precise raising and lowering of the valve stem.

[0008] In the aforementioned air-jacking demolding structure for an inspection port cover, both the inlet and outlet ends of the vent pipe are fixedly connected to the moving mold. This prevents the vent pipe from shifting during the ventilation process.

[0009] In the aforementioned air-jacking demolding structure for an inspection port cover, the sidewall of the vent channel has a first annular step, and the lower end of the valve stem has a second annular step. The upper and lower ends of the elastic element abut against the first and second annular steps, respectively. This allows the valve stem to better compress the elastic element, and also allows the elastic element to better push the valve stem downward during reset. The elastic element can be a spring or a rubber band, preferably a spring.

[0010] In the aforementioned air-jacking demolding structure for an inspection port cover, the inlet end of the vent pipe is equipped with a one-way valve that directs the airflow within the vent pipe unidirectionally towards the outlet. This one-way valve is connected to a solenoid valve. The one-way valve prevents backflow of gas within the vent pipe, and the solenoid valve allows for better control of airflow, making operation more convenient.

[0011] In the aforementioned air-jacking demolding structure for an inspection port cover, a cavity perforation plate is also connected to the top of the valve stem, and the upper end face of the cavity perforation plate is flush with the edge of the upper port of the ventilation channel. By retaining the original cavity perforation plate, the mold cavity can better retain its original shape and function during processing.

[0012] Compared with existing technologies, the advantages of the air-pump demolding structure of this inspection port cover are as follows: On the one hand, the air-pump demolding structure of this inspection port cover allows the mold cavity to retain its original shape and function during processing; on the other hand, it allows external air to be introduced into the cavity to relieve the negative pressure inside the cavity when the threaded cover is demolded, making the demolding of the threaded cover smoother and more convenient, avoiding damage to the product threads, thereby improving the demolding effect of the threaded cover and increasing the yield. Attached Figure Description

[0013] Figure 1 This is a cross-sectional view of the air-cushion demolding structure of the inspection port cover in Embodiment 1.

[0014] Figure 2 This is a cross-sectional view of the air-jacking demolding structure of the inspection port cover in Embodiment 1 when it is ventilated.

[0015] Figure 3 This is a cross-sectional view of the air-cushion demolding structure of the inspection port cover in Embodiment 2.

[0016] In the figure, 1 is the moving mold; 2 is the ventilation channel; 2a is the first annular step; 3 is the ventilation pipe; 4 is the valve stem; 4a is the second annular step; 5 is the elastic element; 6 is the one-way air valve; 7 is the solenoid valve; and 8 is the cavity plate. Detailed Implementation

[0017] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0018] Example 1

[0019] An air-pump demolding structure for an inspection cap, as shown in the reference. Figure 1-2 The mold includes a moving mold 1. The air ejection structure of this inspection port cover includes a ventilation channel 2 that penetrates the bottom wall of the upper cavity of the moving mold 1. A ventilation pipe 3 connected to the moving mold 1 is provided in the ventilation channel 2, and a valve rod 4 that can be raised and lowered relative to the moving mold 1 is vertically arranged. An elastic element 5 is sleeved on the valve rod 4. The upper and lower ends of the elastic element 5 abut against the moving mold 1 and the valve rod 4, respectively. The upper end of the valve rod 4 is in the shape of an inverted frustum. Under the action of the elastic element 5, the upper end of the valve rod 4 abuts against the inner wall of the upper port of the ventilation channel 2 and closes the upper port of the ventilation channel 2. The lower end of the valve rod 4 abuts against the air outlet end of the ventilation pipe 3 and closes the air outlet of the ventilation pipe 3. The upper end face of the valve rod 4 is flush with the edge of the upper port of the ventilation channel 2.

[0020] Specifically, refer to Figure 1-2Both the ventilation channel 2 and the ventilation pipe 3 are L-shaped. The outlet end of the ventilation pipe 3 is cylindrical, and its inlet end extends out of the side wall of the moving mold 1. The lower end of the valve stem 4 is located within the edge of the outlet of the ventilation pipe 3. In this embodiment, preferably, both the inlet end and the outlet end of the ventilation pipe 3 are fixedly connected to the moving mold 1. Preferably, the side wall of the ventilation channel 2 has a first annular step portion 2a, and the lower end of the valve stem 4 has a second annular step portion 4a. The upper and lower ends of the elastic member 5 abut against the first annular step portion 2a and the second annular step portion 4a, respectively.

[0021] Furthermore, referring to Figure 1-2 The air inlet end of the vent pipe 3 is provided with a one-way air valve 6 for unidirectionally guiding the airflow in the vent pipe 3 to the air outlet of the vent pipe 3, and the one-way air valve 6 is connected to a solenoid valve 7.

[0022] The working principle of the air-cushion release structure of this inspection port cover is explained below:

[0023] When the mold is closed, the upper end face of the valve rod 4 is flush with the edge of the upper port of the ventilation channel 2. At the same time, the upper end of the valve rod 4 abuts against the edge of the upper port of the ventilation channel 2 and closes the upper port of the ventilation channel 2, so that the mold cavity can retain its original shape and function during processing. When the mold is opened, the solenoid valve 7 is opened, and the airflow from the external air source flows through the one-way air valve 6 and then through the air inlet of the ventilation pipe 3 to the air outlet. Then, the airflow from the air outlet of the ventilation pipe 3 pushes the valve rod 4 upward and compresses the elastic element 5. After the valve rod 4 moves upward, it opens the upper port of the ventilation channel 2. Subsequently, the airflow flows along the ventilation channel 2 to the cavity, thereby relieving the negative pressure problem inside the cavity and improving the demolding effect of the threaded cap to increase the yield. When the mold is opened, the solenoid valve 7 is closed, and the airflow from the external air source no longer enters the ventilation pipe 3. Under the action of the elastic element 5, the valve rod 4 moves downward to reset and re-closes the upper port of the ventilation channel 2, waiting for the next mold opening.

[0024] Example 2

[0025] This embodiment is basically the same in structure and principle as Embodiment 1, the difference being: (Refer to...) Figure 3 The top of the valve stem 4 is connected to a cavity plate 8. The upper end face of the cavity plate 8 is flush with the edge of the upper port of the ventilation channel 2. That is, the cavity plate 8 removed when the bottom wall of the original cavity is opened is retained, and the cavity plate 8 is connected to the top of the valve stem 4.

[0026] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. An air-pump demolding structure for an inspection cap, the mold comprising a moving mold (1), characterized in that, The air-jacking demolding structure of this inspection port cover includes a ventilation channel (2) that penetrates the bottom wall of the upper cavity of the moving mold (1). A ventilation pipe (3) connected to the moving mold (1) is provided in the ventilation channel (2), and a valve rod (4) that can be raised and lowered relative to the moving mold (1) is provided vertically. An elastic element (5) is sleeved on the valve rod (4). The upper and lower ends of the elastic element (5) abut against the moving mold (1) and the valve rod (4) respectively. The upper end of the valve rod (4) is in the shape of an inverted frustum. Under the action of the elastic element (5), the upper end of the valve rod (4) abuts against the inner wall of the upper port of the ventilation channel (2) and closes the upper port of the ventilation channel (2). The lower end of the valve rod (4) abuts against the air outlet end of the ventilation pipe (3) and closes the air outlet of the ventilation pipe (3). The upper end face of the valve rod (4) is flush with the edge of the upper port of the ventilation channel (2).

2. The air-pump demolding structure for an inspection port cover according to claim 1, characterized in that, Both the ventilation channel (2) and the ventilation pipe (3) are L-shaped. The outlet end of the ventilation pipe (3) is cylindrical and its inlet end extends out of the side wall of the moving mold (1). The lower end of the valve stem (4) is located inside the edge of the outlet of the ventilation pipe (3).

3. The air-pump demolding structure for an inspection port cover according to claim 2, characterized in that, The air inlet and outlet of the vent pipe (3) are both fixedly connected to the moving mold (1).

4. The air-pump demolding structure for an inspection port cover according to claim 1, characterized in that, The ventilation channel (2) has a first annular step (2a) on its side wall, and the lower end of the valve stem (4) has a second annular step (4a). The upper and lower ends of the elastic member (5) abut against the first annular step (2a) and the second annular step (4a) respectively.

5. The air-pump demolding structure for an inspection port cover according to claim 1, 2, 3, or 4, characterized in that, The air inlet end of the vent pipe (3) is provided with a one-way air valve (6) for unidirectionally guiding the airflow in the vent pipe (3) to the air outlet of the vent pipe (3), and the one-way air valve (6) is connected to a solenoid valve (7).

6. The air-pump demolding structure for an inspection port cover according to claim 5, characterized in that, The top of the valve stem (4) is also connected to a cavity plate (8), and the upper end face of the cavity plate (8) is flush with the edge of the upper port of the ventilation channel (2).

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