A die-casting mold for lamp tubes

Abstract

This utility model relates to a die-casting mold for lamp tubes. The die-casting mold for lamp tubes includes a fixed mold and a movable mold disposed above the fixed mold. The top wall of the fixed mold is recessed in the middle to form a mold cavity. A movable plate is disposed below the mold cavity. Both ends of the movable plate are connected to a linkage structure. An ejector pin is fixedly connected to the upper surface of the movable plate. The tip of the ejector pin penetrates the bottom wall of the mold cavity and is slidably connected to the bottom wall of the mold cavity. During the secondary die-casting after cleaning the mold cavity with cleaning fluid, the cleaning fluid adhering to the ejector pin will move down synchronously with the ejector pin. When the cleaning fluid moves with the ejector pin to the scraper ring position, the cleaning fluid is scraped off from the ejector pin by the scraper ring and collected in the water collection box. Finally, under the action of gravity, it is discharged from the fixed mold through the drain pipe. This method avoids the problem of cleaning fluid entering the fixed mold with the ejector pin, which can easily cause corrosion to the ejector pin and the internal structure of the fixed mold and affect the service life of the mold.

Description

Technical Field

[0001] This utility model belongs to the field of die-casting mold technology, specifically relating to a mold for die-casting lamp tubes. Background Technology

[0002] Die casting is a metal casting process that uses high pressure to apply to molten metal material inside a mold cavity. The mold is usually made of a higher strength alloy material. This process is similar to injection molding.

[0003] To facilitate the ejection of die-cast products, die-casting molds typically have ejector pins installed in the fixed mold. When cleaning fluid is sprayed to clean the die-casting mold after mold opening, the ejector pins are exposed inside the fixed mold cavity, making them susceptible to fluid buildup. When the ejector pins are reset during die casting, the fluid adhering to them will enter the fixed mold along with the ejector pins, causing corrosion and severely affecting the service life of the die-casting mold. Utility Model Content

[0004] The purpose of this utility model is to provide a simple and reasonably designed mold for lamp tube die casting in order to solve the above problems.

[0005] This utility model achieves the above objectives through the following technical solutions:

[0006] A die-casting mold for lamp tubes includes a fixed mold and a movable mold disposed above the fixed mold. The top wall of the fixed mold is recessed in the middle to form a mold cavity. A movable plate is disposed below the mold cavity. Both ends of the movable plate are connected to a linkage structure. An ejector pin is fixedly connected to the upper surface of the movable plate. The top end of the ejector pin penetrates the bottom wall of the mold cavity and is slidably connected to the bottom wall of the mold cavity. A scraper ring is slidably sleeved on the ejector pin below the bottom wall of the mold cavity. A water collection box with an annular structure is integrally formed on the outer wall of the scraper ring. A drain pipe is connected to the bottom wall of the water collection box. The end of the drain pipe away from the water collection box penetrates the outer wall of the fixed mold and is fixed to the outer wall of the fixed mold.

[0007] As a further optimization of this utility model, the lower surface of the moving mold is integrally formed with a mold core. After the moving mold is pressed down to close with the fixed mold, a gap is formed between the outer surface of the mold core and the inner surface of the mold cavity, which is adapted to the shape and size of the lamp tube.

[0008] As a further optimization of this utility model, the linkage structure includes two guide rods fixedly connected to the bottom wall of the fixed mold. A spring is sleeved on the bottom end of each of the two guide rods. A sliding tube with its bottom end abutting against the top end of the spring is slidably sleeved on the guide rod above the spring. The top end of the sliding tube slides through the top wall of the fixed mold and extends to the top of the fixed mold.

[0009] As a further optimization of this utility model, when the spring is in the extended state, the length of the slide tube located above the top of the fixed mold is less than the maximum compression length of the spring.

[0010] As a further optimization of this utility model, the movable plate has a rectangular plate structure, and both ends of the movable plate are provided with connecting holes. The end of the movable plate is sleeved on the bottom end of the sliding tube through the connecting holes and fixed to the bottom end of the sliding tube.

[0011] As a further optimization of this utility model, a sealing groove is provided on the bottom wall of the mold cavity, and a sealing gasket that matches the size of the sealing groove is fixedly connected to the top of the ejector pin. When the slide tube is fully pressed into the fixed mold, the sealing gasket fits tightly with the sealing groove.

[0012] As a further optimization of this utility model, the top of the scraper ring is provided with an inclined surface that slopes towards the ejector pin, and the middle section of the drain pipe is inclined downward.

[0013] The beneficial effects of this utility model are as follows:

[0014] 1. During the secondary die casting after cleaning the mold cavity with cleaning fluid, the cleaning fluid adhering to the ejector pin will move down synchronously with the ejector pin. When the cleaning fluid moves with the ejector pin to the scraper ring position, the cleaning fluid is scraped off from the ejector pin by the scraper ring and collected in the water collection box. Finally, under the action of gravity, it is discharged from the fixed mold through the drain pipe. This avoids the problem of cleaning fluid entering the fixed mold with the ejector pin, which can easily cause corrosion to the internal structure of the ejector pin and the fixed mold and affect the service life of the mold.

[0015] 2. The water collection box has a ring structure. The outer ring of the water collection box is fixed to the bottom wall of the mold cavity, while the inner ring of the sealing gasket is always in close contact with the surface of the ejector pin, forming a sealed structure. When some of the cleaning fluid that cannot be completely discharged from the water collection box forms water vapor under the high temperature of the secondary die casting, the water vapor cannot enter the fixed mold below the mold cavity and escapes through the drain pipe. This can minimize the corrosion of metal parts such as springs in the fixed mold by water vapor. Attached Figure Description

[0016] Figure 1 This is an exploded view of the overall structure of this utility model;

[0017] Figure 2 This is a utility model Figure 1 A schematic diagram of the first cross-sectional structure;

[0018] Figure 3 This is a utility model Figure 1 A schematic diagram of the second cross-sectional structure;

[0019] Figure 4 This is a utility model Figure 3Enlarged view of a close-up detail at point A in the middle;

[0020] Figure 5 This is a schematic diagram showing the connection between the movable plate, the ejector pin, and the linkage structure of this utility model.

[0021] In the diagram: 1. Fixed mold; 2. Moving mold; 3. Mold cavity; 4. Mold core; 5. Guide rod; 6. Spring; 7. Slide tube; 8. Movable plate; 9. Ejector pin; 10. Sealing gasket; 11. Sealing groove; 12. Scraper ring; 13. Water collection box; 14. Drain pipe. Detailed Implementation

[0022] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0023] Example

[0024] like Figure 1 - Figure 5 As shown, a die-casting mold for lamp tubes includes a fixed mold 1 and a movable mold 2 disposed above the fixed mold 1. The top wall of the fixed mold 1 is recessed in the middle to form a mold cavity 3. A mold core 4 is integrally formed on the lower surface of the movable mold 2. After the movable mold 2 is pressed down to close with the fixed mold 1, a gap is formed between the outer surface of the mold core 4 and the inner surface of the mold cavity 3, which is adapted to the shape and size of the lamp tube, and is used to form a lamp tube die-casting part in the gap.

[0025] A movable plate 8 is provided below the mold cavity 3. Both ends of the movable plate 8 are connected to a linkage structure. The linkage structure includes two guide rods 5 fixedly connected to the bottom wall of the fixed mold 1. A spring 6 is sleeved at the bottom of each guide rod 5. A slide tube 7 with its bottom end abutting against the top end of the spring 6 is slidably sleeved on the guide rod 5 above the spring 6. The top end of the slide tube 7 slides through the top wall of the fixed mold 1 and extends to the top of the fixed mold 1. When the moving mold 2 is pressed down to close the mold with the fixed mold 1, the edge of the moving mold 2 will push the slide tube 7 to slide into the fixed mold 1, thereby squeezing the spring 6 to contract through the bottom end of the slide tube 7. When the moving mold 2 moves up to open the mold, the pressure on the slide tube 7 disappears. At this time, the spring 6 can push the slide tube 7 to reset under its own elastic force.

[0026] The movable plate 8 has a rectangular plate structure. Both ends of the movable plate 8 have connection holes. The end of the movable plate 8 is sleeved on the bottom end of the slide tube 7 through the connection holes and fixed to the bottom end of the slide tube 7. The upper surface of the movable plate 8 is fixedly connected to the ejector pin 9. The top of the ejector pin 9 penetrates the bottom wall of the mold cavity 3 and is slidably connected to the bottom wall of the mold cavity 3. Since the end of the movable plate 8 is fixed to the bottom end of the slide tube 7, when the moving mold 2 is pressed down and the fixed mold 1 is closed, the slide tube 7 slides down and drives the movable plate 8 to move down synchronously, thereby driving the ejector pin 9 to slide to the bottom wall of the mold cavity 3. At this time, molten metal can be added to the gap between the mold core 4 and the mold cavity 3 through the pouring port set on the moving mold 2. After the molten metal cools down, the lamp tube can be formed in the gap. When the upper moving mold 2 is opened, the spring 6 cooperates with the slide tube 7 to push the movable plate 8 to reset. At this time, the ejector pin 9 moves up and passes through the bottom wall of the mold cavity 3, pushing the formed lamp tube up, so as to automatically eject the formed lamp tube from the mold cavity 3.

[0027] A sealing groove 11 is provided on the bottom wall of the inner cavity of the mold cavity 3. A sealing gasket 10 that matches the size of the inner cavity of the sealing groove 11 is fixedly connected to the top of the ejector pin 9. The sealing gasket 10 is made of a high temperature resistant material. When the slide tube 7 is completely pressed into the interior of the fixed mold 1, the sealing gasket 10 and the sealing groove 11 fit tightly together. This is used to seal the connection between the bottom wall of the inner cavity of the mold cavity 3 and the ejector pin 9 by the sealing gasket 10 and the sealing groove 11 after the moving mold 2 and the fixed mold 1 are closed, so as to avoid leakage of molten metal during the die casting process.

[0028] A scraper ring 12 is slidably sleeved on the ejector pin 9 below the bottom wall of the mold cavity 3. The inner ring of the scraper ring 12 is tightly fitted with the outer wall of the ejector pin 9. When the ejector pin 9 moves down under the pushing action of the slide tube 7, the cleaning liquid attached to the ejector pin 9 can be scraped off by the friction between the scraper ring 12 and the outer surface of the ejector pin 9. The top of the scraper ring 12 has an inclined surface that is inclined towards the ejector pin 9, which is conducive to collecting the cleaning liquid scraped off from the ejector pin 9 through the inclined surface.

[0029] The outer wall of the scraper ring 12 is integrally formed with a ring-shaped water collection box 13. The top wall of the outer ring of the water collection box 13 is fixed to the bottom wall of the mold cavity 3. When the cleaning liquid is scraped off from the ejector pin 9, it will collect in the water collection box 13 along the inclined surface. A drain pipe 14 is connected to the bottom wall of the water collection box 13. The middle section of the drain pipe 14 is inclined downward. The end of the drain pipe 14 away from the water collection box 13 passes through the outer wall of the fixed mold 1 and is fixed to the outer wall of the fixed mold 1, so that the cleaning liquid collected in the water collection box 13 can be quickly discharged through the drain pipe 14.

[0030] It should be noted that, in use, this type of lamp tube die-casting mold utilizes an external drive device to drive the moving mold 2 downwards, closing with the fixed mold 1 located below the moving mold 2. During the downward movement of the moving mold 2, it first contacts the top of the slide tube 7 and pushes the slide tube 7 downwards along the guide rod 5, compressing the spring 6 to contract. The ejector pin 9 is fixed to the bottom end of the slide tube 7 via the movable plate 8. As the slide tube 7 slides down, the top of the ejector pin 9 slides down synchronously until the sealing gasket 10 installed at the top of the ejector pin 9 is tightly fitted with the sealing groove 11 opened on the bottom wall of the mold cavity 3. At this time, the moving mold 2 and the fixed mold 1 are in the closed mold state. The user can then pour molten metal into the gap between the mold core 4 and the mold cavity 3 through the pouring port provided on the moving mold 2. After the molten metal cools and solidifies, the drive device is used to drive the moving mold 2 upwards to open the mold. During the mold opening process, the slide tube 7 loses the squeezing effect of the moving mold 2 and resets under the elastic force of the spring 6. It then drives the ejector pin 9 mounted on the movable plate 8 to move upward, pushing out the die-cast lamp tube in the mold cavity 3, thus realizing automatic unloading of the die-cast part. Then, the mold cavity 3 can be cleaned with cleaning fluid for die casting again. During the second die casting, the cleaning fluid adhering to the ejector pin 9 will move downward synchronously with the ejector pin 9. When the cleaning fluid moves with the ejector pin 9 to the scraper ring 12, it is scraped off from the ejector pin 9 by the scraping action of the scraper ring 12 and collected in the water collection box 13. Finally, it is discharged from the fixed mold 1 through the drain pipe 14 under the action of gravity. This avoids the cleaning fluid entering the fixed mold 1 with the ejector pin 9, which could easily cause corrosion to the internal structure of the ejector pin 9 and the fixed mold 1, affecting the service life of the mold.

[0031] The embodiments described above are merely examples of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these modifications and improvements all fall within the protection scope of this utility model.

Claims

1. A die-casting mold for lamp tubes, comprising a fixed mold (1) and a movable mold (2) disposed above the fixed mold (1), wherein the top wall of the fixed mold (1) is recessed in the middle to form a mold cavity (3), characterized in that: A movable plate (8) is provided below the mold cavity (3). Both ends of the movable plate (8) are connected to a linkage structure. An ejector pin (9) is fixedly connected to the upper surface of the movable plate (8). The top end of the ejector pin (9) penetrates the bottom wall of the mold cavity (3) and is slidably connected to the bottom wall of the mold cavity (3). A scraper ring (12) is slidably sleeved on the ejector pin (9) below the bottom wall of the mold cavity (3). A water collection box (13) with an annular structure is integrally formed on the outer wall of the scraper ring (12). A drain pipe (14) is connected to the bottom wall of the water collection box (13). One end of the drain pipe (14) away from the water collection box (13) penetrates the outer wall of the fixed mold (1) and is fixed to the outer wall of the fixed mold (1).

2. The die-casting mold for lamp tubes according to claim 1, characterized in that: The lower surface of the moving mold (2) is integrally formed with a mold core (4). After the moving mold (2) is pressed down to close with the fixed mold (1), a gap is formed between the outer surface of the mold core (4) and the inner surface of the mold cavity (3) that is adapted to the shape and size of the lamp tube.

3. The die-casting mold for lamp tubes according to claim 1, characterized in that: The linkage structure includes two guide rods (5) fixedly connected to the bottom wall of the fixed mold (1). The bottom ends of the two guide rods (5) are fitted with springs (6). A sliding tube (7) with its bottom end abutting against the top end of the spring (6) is slidably fitted on the guide rod (5) above the spring (6). The top end of the sliding tube (7) slides through the top wall of the fixed mold (1) and extends to the top of the fixed mold (1).

4. The die-casting mold for lamp tubes according to claim 3, characterized in that: When the spring (6) is in the extended state, the length of the slide tube (7) located above the top of the fixed mold (1) is less than the maximum compression length of the spring (6).

5. A die-casting mold for lamp tubes according to claim 3, characterized in that: The movable plate (8) has a rectangular plate structure. Both ends of the movable plate (8) are provided with connection holes. The end of the movable plate (8) is sleeved on the bottom end of the slide tube (7) through the connection holes and fixed to the bottom end of the slide tube (7).

6. The die-casting mold for lamp tubes according to claim 3, characterized in that: A sealing groove (11) is provided on the bottom wall of the inner cavity of the mold cavity (3). A sealing gasket (10) that is adapted to the size of the inner cavity of the sealing groove (11) is fixedly connected to the top of the ejector pin (9). When the slide tube (7) is completely pressed into the interior of the fixed mold (1), the sealing gasket (10) and the sealing groove (11) fit tightly together.

7. The die-casting mold for lamp tubes according to claim 1, characterized in that: The top of the scraper ring (12) is provided with an inclined surface that is inclined towards the ejector pin (9), and the middle section of the drain pipe (14) is inclined downward.

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