Engine cover injection mold

Abstract

The present invention belongs to the field of injection molds, and specifically discloses an engine flip cover injection mold, wherein an upper cooling pipe is provided in a movable mold, a lower cooling pipe is provided in a fixed mold, the upper cooling pipe and the lower cooling pipe are connected, a fixed ring is fixedly connected to the inner wall of the upper cooling pipe, a support seat is fixedly connected to the fixed ring, a baffle is fixedly connected to the lower part of the support seat, a support tube is slidably connected in the lower cooling pipe, a push rod is fixedly connected to the upper part of the push rod, a crushing connection pile is fixedly connected to the top of the push rod, a cooling ring is provided on the outer periphery of the upper cooling pipe, the support seat and the crushing connection pile are both located in the cooling ring, a quick freezing channel for filling liquid nitrogen is provided in the movable mold, the cooling ring is located in the quick freezing channel, a sliding hole is provided in the fixed mold, the sliding hole is connected to the lower cooling pipe, and a gear lever for preventing the push tube from descending is slidably connected in the sliding hole. This device solves the problem in the prior art that coolant dripping from the movable mold will contaminate the fixed mold when the mold is opened.

Description

Technical Field

[0001] The invention belongs to the field of injection molds, and in particular relates to an engine flip cover injection mold. Background Art

[0002] The engine cover plays a significant role during use, for example: preventing burns: many car owners like to open the engine cover themselves when the engine makes unusual noises or encounters any problems. If there is no engine cover, it is easy to accidentally touch the engine directly with your hands and cause burns; decoration: the engine cover of BYD is very beautifully decorated, and it looks clean and tidy; sound insulation: the engine makes some noise, and the engine cover has a sound insulation effect.

[0003] The engine cover is injection molded by an injection mold. The injection mold consists of a movable mold and a fixed mold. The movable mold is installed on the fixed template of the injection molding machine. During injection molding, the movable mold and the fixed mold are closed to form a pouring system and a mold cavity. When the mold is opened, the movable mold and the fixed mold are separated to remove the plastic product. At present, the commonly used mold cooling methods in the injection molding industry mainly include water cooling and oil cooling. Generally, water cooling is usually used in the injection molding industry. That is, a water channel is set in or around the mold cavity, and the water cooling cycle is used to take away the heat, increase the cooling time, control the mold temperature, and shorten the molding cycle. However, the fixed mold and the movable mold of the existing injection mold are cooled separately. This cooling method has the problem of uneven cooling, which causes quality problems in the product. The patent document with the authorization announcement number CN106042310B discloses a high-precision and high-efficiency injection mold. This solution connects the water channels in the fixed mold and the movable mold, solving the problem of uneven cooling of the fixed mold and the movable mold. However, after the water channels in the fixed mold and the movable mold are connected, when the mold is opened, the coolant remaining in the movable mold will drip onto the fixed mold, causing contamination to the fixed mold and thus contaminating the product in the cavity. Summary of the Invention

[0004] The object of the present invention is to provide an engine flip cover injection mold to solve the problem in the prior art that coolant dripping from the movable mold contaminates the fixed mold when the mold is opened.

[0005] In order to achieve the above-mentioned purpose, the basic scheme of the present invention provides an engine flip cover injection mold, including a fixed mold and a movable mold that can cover the fixed mold, an upper cooling pipe is provided in the movable mold, a lower cooling pipe is provided in the fixed mold, the upper cooling pipe and the lower cooling pipe are connected, an upper joint is provided in the upper cooling pipe, and a lower joint is provided in the lower cooling pipe. The upper joint includes a fixing ring, which is fixedly connected to the inner wall of the upper cooling pipe, a support seat is fixedly connected to the fixing ring, and a baffle is fixedly connected to the lower part of the support seat. The lower joint includes an abutment cylinder, which is slidably connected to the lower cooling pipe, and the lower part of the abutment cylinder is fixedly connected A first return spring is connected, and one end of the first return spring away from the abutment tube is fixedly connected to the inner wall of the lower cooling pipe. A return rod is fixedly connected to the upper part of the abutment tube, and a crushing connecting pile is fixedly connected to the top of the return rod. A cooling ring is provided on the outer periphery of the upper cooling pipe, and the support seat and the crushing connecting pile are both located in the cooling ring. A quick freezing channel for filling liquid nitrogen is provided in the movable mold, and the cooling ring is located in the quick freezing channel. A sliding hole is provided in the fixed mold, and the sliding hole is connected to the lower cooling pipe. A gear rod for preventing the abutment tube from descending is slidably connected in the sliding hole. When the first return spring is in a natural state, the side wall of the abutment tube covers the sliding hole.

[0006] The principle of this basic solution is to inject coolant into the upper cooling channel, which then flows into and fills the lower cooling channel, where it is then discharged. This circulating coolant flow, through the inflow of the upper cooling channel and the discharge of the lower cooling channel, uniformly cools both the movable and fixed molds.

[0007] After cooling is complete and before the mold is opened, liquid nitrogen is injected into the quenching channel. Under normal pressure, liquid nitrogen has a temperature of -196°C, which rapidly freezes water. Within a short period of time, the coolant in the cooling ring freezes into ice, blocking the upper cooling channel. The ice in the cooling ring freezes to the support seat and crushing connection post within the cooling ring. Simultaneously, the upper cooling channel is blocked, preventing coolant from dripping onto the fixed mold during mold opening. The movable mold is moved upward, separating the upper and lower cooling channels. The support seat moves away from the lower cooling channel, carrying the ice upward with it. This ice moves the crushing connection post upward, which in turn moves the abutment cylinder upward, stretching the first return spring. As the abutment cylinder moves upward, a sliding hole is exposed, allowing the lever to enter the lower cooling channel. The lever is now positioned below the abutment cylinder. When the first return spring is stretched to its limit, the abutment cylinder stops moving, separating the crushing connection post from the ice. The baffle plate blocks the ice, securing it to the support seat and preventing it from moving downward with the crushing connection post. After the crushing connection pile separates from the ice, the abutment cylinder moves downward under the action of the first return spring and abuts against the stopper rod below it. At this point, the abutment cylinder is higher than when the first return spring is in its neutral position. In other words, the crushing connection pile is higher than when the first return spring is in its neutral position.

[0008] After removing the workpiece from the cavity and closing the mold, the movable mold moves downward, which in turn moves the upper cooling channel downward, and in turn, the support seat and the ice cube downward. Because the crushing connecting pile is higher than the position of the first return spring in its neutral state, the ice cube has a speed when moving downward, so it collides with the crushing connecting pile, breaking the ice into small pieces. This allows the coolant above the ice cube to flow into the lower cooling channel.

[0009] The beneficial effects of this basic solution are: 1. This device avoids discharging the coolant in the lower cooling pipe and the upper cooling pipe when the mold is opened, and then adding coolant when the mold is closed, thereby improving efficiency.

[0010] 2. At the same time, it avoids the upper cooling pipe and the lower cooling pipe being separated when the mold is opened, and the residual coolant in the upper cooling pipe falling into the fixed mold, causing the product to be contaminated.

[0011] Optimization Solution 1: The shift lever is fixedly connected to a connecting plate, a return seat is fixedly connected to the fixed die, and a second return spring is fixedly connected to the return seat. The end of the second return spring, distal from the return seat, is fixedly connected to the connecting plate. The second return spring ensures that the shift lever can be immediately extended into the lower cooling duct after the abutment cylinder rises, eliminating manual operation and increasing the automation level of the device.

[0012] Optimization Solution 2: The crushing connection pile is conical in shape. Unlike other shapes with vertical surfaces, the conical crushing connection pile does not cause excess friction with the ice during separation, allowing the crushing connection pile to separate quickly from the ice when the cylinder moves upward. Furthermore, the conical crushing connection pile has a sharp top, making it easier to crush ice.

[0013] Optimization Solution 3: The cross-section of the support base is in an inverted cone shape. When ice is frozen on the support base with an inverted cone cross-section and is impacted by the crushing connecting pile, it is more easily crushed when it moves upward because the upper section of the support base is larger than the lower section.

[0014] Optimization Solution 4: The cooling ring is made of copper. Copper cooling rings have high thermal conductivity, which can increase the speed at which the coolant freezes and improve efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic structural diagram of an injection mold for an engine flip cover according to an embodiment of the present invention;

[0016] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0017] Figure 3 for Figure 2 Enlarged view of position 9. DETAILED DESCRIPTION

[0018] The present invention will be further described in detail below through specific embodiments:

[0019] The figure marks in the drawings of the specification include: movable mold 1, upper cooling pipe 2, lower cooling pipe 3, fixed mold 4, second return spring 5, return seat 6, quick freezing channel 7, gear lever 8, fixed ring 10, ice cube 11, support seat 12, baffle 13, cooling ring 14, push rod 15, abutment cylinder 16, first return spring 17.

[0020] Example: The engine cover injection mold in this solution is as follows: Figure 1 、 Figure 2 and Figure 3 As shown, the system comprises a fixed mold 4 and a movable mold 1 that can be placed over the fixed mold 4. An upper cooling duct 2 is provided within the movable mold 1, and a lower cooling duct 3 is provided within the fixed mold 4. The upper cooling duct 2 and the lower cooling duct 3 are connected. A liquid inlet pump is connected to the upper cooling duct 2, and a liquid suction pump is connected to the lower cooling duct 3. An upper joint is provided within the upper cooling duct 2, and a lower joint is provided within the lower cooling duct 3. Both the upper joint and the lower joint are located at the connection point between the upper cooling duct 2 and the lower cooling duct 3.

[0021] The upper joint includes a fixing ring 10, which is fixedly connected to the inner wall of the upper cooling pipe 2. The center of the fixing ring 10 is fixedly connected to a support seat 12. The cross-section of the support seat 12 is in the shape of an inverted cone, and the lower part of the support seat 12 is fixedly connected to a baffle 13. A temperature sensor is installed in the support seat 12. The lower joint includes an abutment tube 16, which is slidably connected in the lower cooling pipe 3. The lower part of the abutment tube 16 is fixedly connected to a first return spring 17, and the end of the first return spring 17 away from the abutment tube 16 is fixedly connected to the inner wall of the lower cooling pipe 3. The upper part of the abutment tube 16 is fixedly connected to a vertical abutment rod 15, and the top of the abutment rod 15 is fixedly connected to a conical crushing connection pile. The abutment rod 15 extends into the upper cooling pipe 2.

[0022] The outer periphery of the upper cooling pipe 2 is provided with a cooling ring 14, which is made of copper. The cooling ring 14 is located at the upper joint, and the support seat 12 and the crushing connection pile are both located inside the cooling ring 14. A quick-freezing channel 7 for filling with liquid nitrogen is provided in the movable mold 1, and the cooling ring 14 is located in the quick-freezing channel 7. An insulating layer is installed around the quick-freezing channel 7. A horizontal sliding hole is provided in the fixed mold 4, and an O-ring seal is installed in the sliding hole. The sliding hole is connected to the lower cooling pipe 3, and a gear lever 8 is slidably connected in the sliding hole to prevent the abutment tube 16 from descending. In the natural state of the first return spring 17, the side wall of the abutment tube 16 covers the sliding hole.

[0023] The shift rod 8 is fixedly connected to a connecting plate, the fixed mold 4 is fixedly connected to a reset seat 6, the reset seat 6 is fixedly connected to a second reset spring 5, and one end of the second reset spring 5 away from the reset seat 6 is fixedly connected to the connecting plate.

[0024] During use, the coolant is injected into the upper cooling pipe 2 using the liquid inlet pump. The coolant enters the lower cooling pipe 3 through the upper cooling pipe 2 and fills the lower cooling pipe 3. The coolant in the lower cooling pipe 3 is discharged using the liquid suction pump. That is, a circulating coolant flow is formed by the inflow of the upper cooling pipe 2 and the discharge of the lower cooling pipe 3, which evenly cools the movable mold 1 and the fixed mold 4.

[0025] After cooling is complete and before the mold is opened, liquid nitrogen is injected into the quick-freezing channel 7. Under normal pressure, liquid nitrogen has a temperature of -196°C, which can rapidly freeze water. After a short period of time (approximately 10 to 20 seconds), the coolant in the cooling ring 14 freezes into ice cubes 11, blocking the upper cooling channel 2. The ice cubes 11 in the cooling ring 14 freeze onto the support base 12 and the crushing connection pile within the cooling ring 14. Simultaneously, the upper cooling channel 2 is blocked, preventing the coolant in the upper cooling channel 2 from dripping onto the fixed mold 4 during mold opening. The movable mold 1 is moved upward, separating the upper cooling channel 2 from the lower cooling channel 3. The support base 12 moves away from the lower cooling channel 3, carrying the ice cubes 11 upward. The ice cubes 11 drive the crushing connection pile upward, which in turn drives the abutment cylinder 16 upward, stretching the first return spring 17. As the abutment cylinder 16 moves upward, it leaks out of the sliding hole. The second return spring 5 forces the shift lever 8 into the lower cooling channel 3, where it is now located below the shift lever 16. When the first return spring 17 is pulled to its limit, the abutment tube 16 stops moving, allowing the crushing connection post to separate from the ice cube 11. Because the baffle 13 blocks the ice cube 11 and secures it to the support base 12, it prevents it from moving downward with the crushing connection post. After the crushing connection post separates from the ice cube 11, the abutment tube 16, under the action of the first return spring 17, moves downward and abuts against the stop rod 8 below it. At this point, the abutment tube 16 is higher than when the first return spring 17 is in its neutral position. In other words, the crushing connection post is higher than when the first return spring 17 is in its neutral position.

[0026] After removing the workpiece from the cavity, when the mold needs to be closed, the movable mold 1 is moved downward, causing the upper cooling pipe 2 to move downward, and then the support seat 12 to move downward with the ice cube 11. Because the position of the crushing connection pile is higher than its position when the first return spring 17 is in its natural state, the ice cube 11 has speed when it moves downward, so the ice cube 11 can collide with the crushing connection pile when it moves downward, causing the ice cube 11 to break into small pieces. The coolant above the ice cube 11 can flow into the lower cooling pipe 3 through the middle hole of the fixed ring 10. This avoids discharging the coolant in the lower cooling pipe 3 and the upper cooling pipe 2 when the mold is opened, and then adding coolant when the mold is closed, thereby improving efficiency. At the same time, it avoids the upper cooling pipe 2 and the lower cooling pipe 3 separating when the mold is opened, and the residual coolant in the upper cooling pipe 2 falling into the fixed mold 4, causing the product to be contaminated. At the same time, a temperature sensor is installed in the support seat 12 to facilitate the judgment of the temperature in the mold, and based on the temperature, the mold temperature and the temperature in the cooling ring 14 are judged, and then the timing of mold opening is determined.

[0027] The above is only an embodiment of the present invention, and common knowledge in the scheme is not described in detail here. It should be pointed out that for those skilled in the art, several variations and improvements can be made without departing from the structure of the present invention, and these should also be regarded as the scope of protection of the present invention. These will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. Engine cover injection mold, characterized by: The invention comprises a fixed mold and a movable mold which can cover the fixed mold, an upper cooling pipe is provided in the movable mold, a lower cooling pipe is provided in the fixed mold, the upper cooling pipe and the lower cooling pipe are communicated, an upper joint is provided in the upper cooling pipe, a lower joint is provided in the lower cooling pipe, the upper joint comprises a fixing ring, the fixing ring is fixedly connected to the inner wall of the upper cooling pipe, a support seat is fixedly connected to the fixing ring, a baffle is fixedly connected to the lower part of the support seat, the lower joint comprises an abutting cylinder, the abutting cylinder is slidably connected in the lower cooling pipe, a first return spring is fixedly connected to the lower part of the abutting cylinder, and one end of the first return spring is away from the abutting cylinder. It is fixedly connected to the inner wall of the lower cooling pipe, and a push rod is fixedly connected to the upper part of the abutment cylinder, and a crushing connecting pile is fixedly connected to the top of the push rod. A cooling ring is provided on the outer periphery of the upper cooling pipe, and the support seat and the crushing connecting pile are both located in the cooling ring. A quick freezing channel for filling liquid nitrogen is provided in the movable mold, and the cooling ring is located in the quick freezing channel. A sliding hole is provided in the fixed mold, and the sliding hole is connected to the lower cooling pipe. A gear rod for preventing the abutment cylinder from descending is slidably connected in the sliding hole. When the first return spring is in a natural state, the side wall of the abutment cylinder covers the sliding hole; the cross section of the support seat is in an inverted cone shape.

2. The engine flip cover injection mold according to claim 1, characterized in that: The shift rod is fixedly connected with a connecting plate, the fixed mold is fixedly connected with a reset seat, the reset seat is fixedly connected with a second reset spring, and one end of the second reset spring away from the reset seat is fixedly connected to the connecting plate.

3. The engine flip cover injection mold according to claim 2, characterized in that: The cooling ring is made of copper.

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