Injection mold for face frame of flat panel television

Abstract

This invention relates to the field of injection mold technology, specifically to an injection mold for a flat-panel TV front frame. The mold includes a fixed mold base with a cavity for forming the front frame workpiece. A movable mold base, which mates with the fixed mold base, is located on the left side of the fixed mold base. The fixed mold base has an ejector device for ejecting the front frame workpiece from the cavity. Both the movable and fixed mold bases have mounting cavities at positions corresponding to the cavity. This injection mold utilizes a unit temperature control device to better assist in the filling of plastic raw materials and the cooling of the front frame workpiece. An air jet device removes impurities to prevent them from affecting the production quality of the front frame workpiece. Therefore, it effectively prevents problems such as deformation, cracking, and dimensional instability in the front frame workpiece, thus solving the quality problems that easily occur during injection molding due to uneven cooling, and effectively improving product production quality.

Description

Technical Field

[0001] This invention relates to the field of injection mold technology, specifically to an injection mold for a flat panel TV frame. Background Technology

[0002] Injection molding is a processing technology that uses an injection molding machine to heat plastic and inject it into a corresponding mold to form a product. The front frame of a flat-screen TV is also generally made using injection molding.

[0003] However, because the front frame of a flat-screen TV is rectangular and relatively thin while being long and tall, it is more prone to production problems during processing. These problems include workpiece deformation and cracking due to uneven cooling, and dimensional instability. Patent application CN118254355A, entitled "A Cooling Structure for an Injection Mold and an Injection Mold," provides a mold cooling structure and injection mold that utilizes evenly distributed cooling pipes in a U-shape inside the mold to cool the workpiece. However, this method obviously causes drastic temperature changes in the coolant during its long flow process, resulting in a gradual decrease in the coolant's cooling capacity. This makes it impossible to provide the same or even similar cooling effect to different areas, thus hindering precise control of the cooling effect.

[0004] Therefore, we need an injection mold for the front frame of a flat-screen TV to solve the quality problems that easily occur in the front frame workpiece during the injection molding process due to uneven cooling, which can effectively improve the production quality of the product. Summary of the Invention

[0005] The purpose of this invention is to solve the quality problems that easily occur in the front frame workpiece during the injection molding process due to uneven cooling and other reasons. This application provides an injection mold for the front frame of a flat-panel TV, which can effectively improve the production quality of the product.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an injection mold for a flat panel TV frame, comprising:

[0007] A fixed mold base is provided with a cavity for forming a front frame workpiece, and a movable mold base that mates with the fixed mold base is provided on the left side of the fixed mold base. The fixed mold base is provided with an ejector device for ejecting the front frame workpiece from the cavity, and both the movable mold base and the fixed mold base are provided with mounting cavities at positions corresponding to the cavity. A mold opening push rod is fixedly installed on the movable mold base, and the output end of the mold opening push rod is fixedly installed with the fixed mold base. A main runner that connects with the nozzle of the injection molding machine is fixedly installed on the fixed mold base, and the main runner injects molding into the cavity through at least one pair of branch runners.

[0008] A unit temperature control device is provided in the mounting cavity. The unit temperature control device includes a heat exchange shell that is fixedly installed in the mounting cavity and fits against the inner wall of the mounting cavity. The interior of the heat exchange shell is divided into at least two unit flow channels by at least one thermally conductive baffle. The two ends of the unit flow channels located on the same unit temperature control device are respectively connected to an inlet pipe and an outlet pipe. The inlet pipe and the outlet pipe are connected to an external coolant supply device. A heater is installed on the heat exchange shell, and the heat output end of the heater is connected to the thermally conductive baffle. The mold opening push rod and the heater are both electrically connected to an external injection molding machine controller.

[0009] Preferably, the fixed mold base is provided with an air jetting device for cleaning the cavity by air jetting. The air jetting device includes a rotary motor fixedly installed at the center of the fixed mold base, and the output end of the rotary motor drives a position adjustment push rod. The output end of the position adjustment push rod drives a rotating seat. A first sleeve is symmetrically arranged on the rotating seat, and a first sleeve rod is slidably installed in the first sleeve. An air jet seat is fixedly installed at the end of the first sleeve rod, and an air jet head for cleaning the cavity by air jetting is fixedly installed on the air jet seat. The air jet head is connected to an external air supply device through an air supply pipe. A guide rail is installed on the fixed mold base. A second sleeve is fixedly installed at the end of the first sleeve rod, and a second sleeve rod is slidably installed in the second sleeve. A slip ring that slides along the guide rail is rotatably installed at the bottom of the second sleeve rod. The rotary motor and the position adjustment push rod are both electrically connected to an external injection molding machine controller.

[0010] Preferably, the first sleeve is provided with a first pull-back device for pulling the air supply pipe, and the first pull-back device includes a first collar fixedly installed on the first sleeve and slidably installed with the air supply pipe. A first fixing plate is fixedly installed on the air supply pipe, and the first fixing plate and the first collar are connected by a first return spring. A first sliding rod is fixedly installed on the first collar and slidably installed with the first fixing plate.

[0011] Preferably, the fixed mold base is provided with a second pull-back device for pulling the air supply pipe. The second pull-back device includes a second collar fixedly installed on the fixed mold base and slidably installed on the air supply pipe, and a second fixing plate fixedly installed on the air supply pipe. The second fixing plate and the second collar are connected by a second return spring. A second slide rod slidably installed on the second collar and fixedly installed on the second fixing plate.

[0012] Preferably, a camera for acquiring images of the cavity is fixedly installed on the jet mount, and the camera is electrically connected to an external injection molding machine controller.

[0013] Preferably, a side push rod is fixedly provided at the top center of the moving mold base, and the output end of the side push rod is fixedly installed with the fixed mold base. A side locking device for locking the moving mold base and the fixed mold base is provided at the bottom center of the moving mold base. The side locking device includes a connecting platform fixedly installed with the moving mold base, and a locking push rod is rotatably installed on the connecting platform. A gear ring is fixedly installed on the locking push rod, and the output end of the locking push rod drives a locking plate. A docking platform corresponding to and clamping the locking plate is fixedly installed on the fixed mold base. A locking adjustment motor is fixedly installed on the connecting platform, and the output end of the locking adjustment motor drives a drive wheel that meshes with the gear ring. The locking adjustment motor is used to drive the locking plate to rotate to the position where it is locked with the docking platform. The locking adjustment motor, the side push rod, and the locking push rod are all electrically connected to an external injection molding machine controller.

[0014] Preferably, the moving mold base has guide holes at its four corners, and the fixed mold base has guide rods that are slidably installed in the guide holes. The moving mold base is provided with a lubrication device for lubricating the guide rods. The lubrication device includes a spiral lubrication channel disposed in the guide holes and directly in contact with the surface of the guide rods. The two ends of the spiral lubrication channel are respectively connected to a supply pipe and a drain pipe, and the supply pipe and the drain pipe are connected to an external lubricating oil circulation supply device. A supply valve is installed on the supply pipe, and a drain valve is installed on the drain pipe. The fixed mold base and the moving mold base are respectively provided with stepped surfaces at the corresponding guide rod positions to prevent lubricating oil from overflowing to the contact position between the moving mold base and the fixed mold base.

[0015] Preferably, a second top-pressing push rod is fixedly installed on the moving mold base, and the output end of the second top-pressing push rod drives a second ejector pin for separating the moving mold base from the front frame workpiece. The second top-pressing push rod is electrically connected to an external injection molding machine controller.

[0016] Preferably, the top pressing device includes a push plate, and at least one pair of first ejector pins for ejecting the front frame workpiece out of the cavity are fixedly installed on the push plate. The push plate and the first ejector pins are connected by a third return spring. The fixed mold base is fixed to the injection molding machine by a fixed frame, and a first top pressing push rod is fixedly installed on the fixed frame. The output end of the first top pressing push rod drives the push plate to move, and the first top pressing push rod is electrically connected to an external injection molding machine controller.

[0017] Preferably, the first ends of all unit flow channels within the same unit temperature control device are connected to the inlet pipe through the front cavity, and the tail ends of all unit flow channels within the same unit temperature control device are connected to the outlet pipe through the rear cavity. Both the front and rear cavities are provided with flow dividers, and each flow divider is provided with at least three flow divider holes that connect the upper and lower ends of the flow divider in an equidistant array. The greater the distance of the flow divider hole in the front cavity from the end of the inlet pipe, the larger the cross-section of the flow divider hole. The greater the distance of the flow divider hole in the rear cavity from the outlet pipe, the larger the cross-section of the flow divider hole.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] The present invention proposes an injection mold for a flat-panel TV front frame, which can better assist the filling of plastic raw materials and the cooling of the front frame workpiece through a unit temperature control device, and remove impurities through an air jet device to avoid impurities affecting the production quality of the front frame workpiece. Therefore, it can effectively prevent problems such as deformation, cracking and dimensional instability of the front frame workpiece, thereby solving the quality problems of the front frame workpiece that are prone to occur during the injection molding process due to uneven cooling, and can effectively improve the production quality of the product. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the present invention;

[0021] Figure 2 This is a schematic diagram of the structure of the present invention;

[0022] Figure 3 This is a schematic diagram of the installation of the fixed mold base and the top pressing device of the present invention;

[0023] Figure 4 This is a schematic diagram of the structure of the fixed mold base of the present invention;

[0024] Figure 5 This is a schematic diagram of the structure of the moving mold base and the side locking device of the present invention;

[0025] Figure 6 This is a schematic diagram of the structure of the moving mold base of the present invention;

[0026] Figure 7 This is a cross-sectional view of the installation of the jetting device for the fixed mold base of the present invention;

[0027] Figure 8 This is a schematic diagram of the jet device of the present invention;

[0028] Figure 9 This is a side view of the structure of the jet device of the present invention;

[0029] Figure 10 This is a cross-sectional view of the unit temperature control device of the present invention.

[0030] In the diagram: 1. Front frame workpiece; 2. First pull-back device; 201. First collar; 202. First return spring; 203. First slide rod; 204. First fixing plate; 3. Second pull-back device; 301. Second collar; 302. Second slide rod; 303. Second return spring; 304. Second fixing plate; 4. Air jet device; 401. Air jet head; 402. Air jet seat; 403. First sleeve rod; 404. First... 405. Sleeve; 406. Rotating seat; 407. Air supply pipe; 408. Second sleeve; 409. Second sleeve rod; 410. Slip ring; 411. Position adjustment push rod; 412. Rotary motor; 5. Lubrication device; 501. Spiral lubrication channel; 502. Liquid supply pipe; 503. Liquid supply valve; 504. Drain valve; 505. Drain pipe; 6. Side locking device; 601. Locking push rod; 602. Locking adjustment motor; 60 3. Drive wheel; 604. Gear ring; 605. Connecting platform; 606. Locking plate; 7. Top pressing device; 701. Third return spring; 702. Push plate; 703. First ejector pin; 8. Unit temperature control device; 801. Heat exchange shell; 802. Inlet pipe; 803. Front cavity; 804. Flow divider; 805. Heater; 806. Thermally conductive baffle; 807. Unit flow channel; 808. Drain pipe; 809. Rear Cavity; 810, Diversion Hole; 9, Stepped Surface; 10, Camera; 11, Docking Platform; 12, Guide Rail; 13, Mounting Cavity; 14, Molded Cavity; 15, Fixed Mold Base; 16, Guide Rod; 17, Guide Hole; 18, Moving Mold Base; 19, First Top Pressing Push Rod; 20, Second Top Pressing Push Rod; 21, Mold Opening Push Rod; 22, Main Runner; 23, Diversion Runner; 24, Second Ejector Pin; 25, Side Push Rod; 26, Fixed Frame. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the present invention clear and complete, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only some, not all, embodiments of the present invention, and are merely illustrative of the embodiments of the present invention. They are not intended to limit the embodiments of the present invention. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] Example 1: Please refer to Figures 1 to 10This invention provides an injection mold for a flat panel TV frame, including a fixed mold base 15 and a unit temperature control device 8. The fixed mold base 15 is provided with a cavity 14 for forming a front frame workpiece 1, and a movable mold base 18 that cooperates with the fixed mold base 15 is provided on the left side of the fixed mold base 15. The fixed mold base 15 is provided with an ejector device 7 for ejecting the front frame workpiece 1 from the cavity 14. Both the movable mold base 18 and the fixed mold base 15 are provided with mounting cavities 13 at positions corresponding to the cavity 14. A mold opening push rod 21 is fixedly installed on the movable mold base 18, and the output end of the mold opening push rod 21 is fixedly installed with the fixed mold base 15. A main flow channel 22 that connects with the nozzle of the injection molding machine is fixedly installed on the fixed mold base 15, and the main flow channel 22 injects into the cavity 14 through at least one pair of branch channels 23. The front frame workpiece 1 is rectangular, so the main runner 22 is set at the center of the moving mold base 18. Then, at least one pair of branch runners 23 branch from the main runner 22 to inject into the cavity 14. This allows the molten material to fill the cavity 14 simultaneously from multiple locations, reducing the distance the material needs to travel to fill the cavity 14 and avoiding various problems caused by gradual cooling of the material during flow. When the mold opening ejector 21 retracts, it can tightly fit the moving mold base 18 onto the fixed mold base 15. After injection molding is completed, the mold opening ejector 21 can push the moving mold base 18 away from the fixed mold base 15, thereby opening the mold. The injection-molded front frame workpiece 1 can then be pushed out of the cavity 14 by the ejector device 7 and discharged from below the fixed mold base 15, thus completing the injection molding process.

[0033] Please see Figure 1 , Figure 5 , Figure 7 and Figure 10At least one unit temperature control device 8 is provided inside the mounting cavity 13. The unit temperature control device 8 includes a heat exchange shell 801 that is fixedly installed in the mounting cavity 13 and fits against the inner wall of the mounting cavity 13. The interior of the heat exchange shell 801 is divided into at least two unit flow channels 807 by at least one thermally conductive baffle 806. The two ends of the unit flow channels 807 located on the same unit temperature control device 8 are respectively connected to the inlet pipe 802 and the outlet pipe 808. The inlet pipe 802 and the outlet pipe 808 are connected to an external coolant supply device. A heater 805 is installed on the heat exchange shell 801, and the heat output end of the heater 805 is connected to the thermally conductive baffle 806. The mold opening push rod 21 and the heater 805 are both electrically connected to an external injection molding machine controller. Next, the first ends of all unit flow channels 807 located in the same unit temperature control device 8 are connected to the inlet pipe 802 through the front cavity 803, and the tail ends of all unit flow channels 807 located in the same unit temperature control device 8 are connected to the outlet pipe 808 through the rear cavity 809. Both the front cavity 803 and the rear cavity 809 are provided with a flow divider plate 804, and each flow divider plate 804 is provided with at least three flow divider holes 810 that connect the upper and lower ends of the flow divider plate 804 in an equidistant array. The farther the flow divider hole 810 in the front cavity 803 is from the end of the inlet pipe 802, the larger the cross-section of the flow divider hole 810. The farther the flow divider hole 810 in the rear cavity 809 is from the outlet pipe 808, the larger the cross-section of the flow divider hole 810. The number of unit temperature control devices 8 should be determined according to the size of the front frame workpiece 1. Generally, the heat exchange shells 801 in all unit temperature control devices 8 should be able to cover all areas corresponding to the cavity 14 in the mounting cavity 13. For ease of maintenance and assembly, it is generally necessary to set one unit temperature control device 8 for each of the four frame parts that need to be injection molded, corresponding to the top, bottom, left and right sides of the front frame workpiece 1. A corresponding unit temperature control device 8 should also be set at each of the four corners of the front frame workpiece 1 to facilitate the adjustment of the cooling rate at the four corners. The unit temperature control device 8 mainly operates in two stages of the injection molding process. The first stage occurs after the moving mold base 18 and the fixed mold base 15 are closed, but before the molten plastic begins to be injected into the cavity 14. During this period, the heater 805 heats the molten plastic for a specified duration at its rated power. Generally, the heater 805 can be an electric heating wire heater. The heat generated by the heater 805 is transferred to the corresponding area of ​​the heat exchange housing 801 through the various heat-conducting baffles 806, and then from the heat exchange housing 801 to the moving mold base 18 or the fixed mold base 15. This ensures that the areas of the moving mold base 18 and the fixed mold base 15 corresponding to the cavity 14 are uniformly heated to the specified temperature. This specified temperature can be the same as the temperature of the molten plastic when it enters the cavity 14, or only 10 to 20 degrees Celsius lower. This method effectively reduces the cooling rate of the molten plastic as it fills the cavity 14.This ensures that the molten plastic flows evenly to all areas of the cavity 14 at a temperature higher than the design temperature to complete the filling. It's important to note that during the heating process of the heater 805, some coolant remains in each unit flow channel 807. However, the external coolant supply equipment has been pre-stopped, so this coolant will remain in these unit flow channels 807. Since the beginning and end of each unit flow channel 807 within the same unit temperature control device 8 are connected by the front cavity 803 and the rear cavity 809 respectively, the coolant in different unit flow channels 807 within the same unit temperature control device 8 can actually flow freely. After the heating device 805 transfers heat to the heat-conducting baffle 806, the coolant in the heat-conducting baffle... The heat from the flow plate 806 is also used to heat the coolant. Since the effective volume of the unit temperature control device 8 is very small, generally less than 20 ml in each heat exchange shell 801, the coolant is rapidly heated and flows to each other, making the internal temperature of the heat exchange shell 801 more uniform. This avoids the heat exchange shell 801 from falling off from the heater 805 after long-term operation, which would prevent the corresponding area from being properly heated. At the same time, the heated coolant can be used to quickly transfer heat to some unavoidable corners of the heating in a flowing form, thereby improving the overall uniformity of heating. After the heater 805 has finished heating, the injection molding machine will inject the molten plastic into the cavity 14. The second stage is used to cool the front frame workpiece 1. After the injection molding machine finishes injecting the molded part into the cavity 14, an external coolant supply device needs to supply coolant to the unit temperature control device 8. This allows the front frame workpiece 1 to cool down quickly. At this time, the uniformity of cooling will affect the quality of the front frame workpiece 1 after molding. Therefore, the unit temperature control device 8 needs to ensure that the front frame workpiece 1 is cooled evenly. The unit temperature control device 8 uses the following three methods to ensure the uniformity of cooling: The first is to reduce the uneven cooling caused by the heat exchange efficiency changes due to the temperature changes of the coolant at different locations. Traditional cooling equipment requires the use of long cooling pipes or cooling loops in a U-shape or similar form. This method of cooling the cavity 14 involves the coolant flowing a long distance through the corresponding pipes or channels, resulting in significant temperature variations in different areas. The coolant initially in contact with the corresponding cooling location in the cavity 14 has a lower temperature, while the coolant leaving the contact area has risen to near the surface temperature of the front frame workpiece 1 due to the long heat exchange through the pipes. Since the temperature difference between the coolant and the front frame workpiece 1 is positively correlated with their thermal conductivity, different areas on the front frame workpiece 1 corresponding to the coolant flow location will have different cooling rates, resulting in uneven cooling of the front frame workpiece 1.Furthermore, since the front frame workpiece 1 is relatively thin, generally not exceeding five millimeters, it is susceptible to significant deformation due to inconsistent cooling rates, leading to corresponding quality issues. In the unit temperature control device 8, a unit flow channel 807, just wide enough to span one side of the front frame workpiece 1, is used to disperse the coolant. This avoids the coolant flowing through a long flow channel, instead increasing the coolant flow rate to ensure sufficient heat exchange per unit time. This ensures that the temperature difference between the coolant entering and leaving the unit flow channel 807 is within ten degrees Celsius, minimizing the impact of coolant temperature variations on heat transfer efficiency and cooling effect. The second method involves reducing the coolant delivery... Uneven cooling caused by incorrect placement: Traditional cooling channels or pipes, when arranged within the moving mold base 18 or fixed mold base 15, are generally not customized according to the shape of the cavity 14, but rather roughly enclose the cavity 14 within a corresponding area. However, since different areas within the cavity 14 require different amounts of molten plastic, the heat exchange required in the same time period also varies. This results in uneven cooling rates, where areas with less plastic filling have already cooled down within a unit time, while areas with more plastic filling have not. The unit temperature control device 8 can address this issue by... Customized adjustments to parameters such as the width between two heat-conducting baffles 806 located at different positions and the thickness of the heat-conducting baffles 806 to be installed ensure that the unit flow channels 807 in different areas can utilize the flowing coolant to provide the required heat exchange at that location, thereby ensuring uniform cooling speed in each area of ​​the cavity 14 and effectively eliminating various defects caused by uneven cooling of the front frame workpiece 1; the third is to eliminate the difference in cooling effect caused by the different flow rates of coolant in different unit flow channels 807. Since the two ends of the unit flow channels 807 located in the same unit temperature control device 8 are fixed on the same inlet pipe 802 and the same outlet pipe 808, this means that without interference The further away from the inlet pipe 802 and outlet pipe 808, the less coolant flows through the unit flow channels 807, resulting in velocity differences in the coolant within different unit flow channels 807. This affects the coolant residence time in the corresponding areas, causing the coolant temperature at those locations to differ from the coolant temperature in other areas. Consequently, this introduces uncontrollable effects on the control of heat exchange efficiency. Therefore, this invention provides flow dividers 804 on the front cavity 803 and rear cavity 809, respectively. The cross-section of the corresponding flow divider orifice 810 on the flow divider 804 is controlled according to the distance from the end of the inlet pipe 802 or the end of the outlet pipe 808, thereby making the coolant flow velocity in each unit flow channel 807 more similar.This indirectly ensures that the coolant can uniformly cool the front frame workpiece 1 according to the preset method.

[0034] Please see Figure 1 , Figure 2 , Figure 7 , Figure 8 and Figure 9The fixed mold base 15 is equipped with an air jetting device 4 for cleaning the cavity 14 with air jets. The air jetting device 4 includes a rotary motor 411 fixedly installed at the center of the fixed mold base 15. The output end of the rotary motor 411 drives a position adjustment push rod 410. The output end of the position adjustment push rod 410 drives a rotating seat 405. A first sleeve 404 is symmetrically arranged on the rotating seat 405. A first sleeve rod 403 is slidably installed inside the first sleeve 404. An air jetting seat 402 is fixedly installed at the end of the first sleeve rod 403. An air jetting head 401 for cleaning the cavity 14 with air jets is fixedly installed on the air jetting seat 402. The air jetting head 401 is connected to an external air supply device through an air supply pipe 406. A guide rail is installed on the fixed mold base 15. The first sleeve 403 is fixedly mounted with a second sleeve 407 at its end, and a second sleeve 408 is slidably mounted inside the second sleeve 407. A slip ring 409, which slides along the guide rail 12, is rotatably mounted at the bottom of the second sleeve 408. The rotary motor 411 and the position adjustment push rod 410 are both electrically connected to an external injection molding machine controller. A camera 10 for image acquisition of the cavity 14 is fixedly mounted on the jet seat 402, and the camera 10 is electrically connected to the external injection molding machine controller. The jet device 4 is used to detect and clean residual gas and impurities in the cavity 14. Specifically, the molten plastic injected into the cavity 14 by the injection molding machine is not a single component, but a polymer of many different types of molecules. Some molecules inherently contain volatile components, or some macromolecules decompose at high temperatures to form volatile components. These volatile components are not necessarily completely removed with the ejection of the front frame workpiece 1, but tend to adhere to the surface of the cavity 14, thus affecting normal venting during subsequent injection molding. Some molecules may even adhere to the cavity 14 and the front frame workpiece 1 formed in the next injection molding, leading to difficulties in demolding and deformation of the front frame workpiece 1 during demolding. Therefore, after each mold opening, the ejector device 7 first ejects the front frame workpiece 1 from the cavity 14, and then the air jet device 4 cleans the inside of the cavity 14 with air jets. Specifically, the front frame workpiece 1 is a rectangular frame, so its width is greater than its height. In cases where it is not necessary to... When the jetting device 4 is in operation, the two jetting heads 401 of the jetting device 4 will be positioned in the middle of the fixed mold base 15 along the width direction of the front frame workpiece 1 under the drive of the slip ring 409. After the front frame workpiece 1 is pushed out by the pressing device 7, the position adjusting push rod 410 will push the rotating seat 405 out of the fixed mold base 15. At this time, the second sleeve rod 408 will also slide relative to the second sleeve 407. Subsequently, the rotary motor 411 will drive the rotating seat 405 to rotate. When the rotating seat 405 rotates, the slip ring 409 will move along the guide rail 12, thereby using the guide rail 12 to drive the first sleeve rod 403, which is equivalent to the first sleeve 404, to slide, thereby rotating the jetting head 401 to the top of the cavity 14.Subsequently, hot air is supplied through an external air supply device and then injected into the cavity 14 by the jet nozzle 401. This powerful airflow flushes away impurities such as particulate matter within the cavity 14. During this process, the camera 10 captures images of the cavity 14, allowing operators to analyze the images and identify potential problems such as material residue due to incomplete demolding. During the cleaning process, the rotary motor 411 rotates the rotating seat 405 one revolution clockwise and then one revolution counterclockwise to reset it. At this time, the jet nozzle 401 returns to its position, allowing it to be concealed within the middle area of ​​the fixed mold base 15. Then, the position adjustment push rod 410 returns to its original position. Pulling the rotating base 405 retracts the entire jetting device 4 back into the middle area of ​​the fixed mold base 15, preventing it from affecting the normal demolding of the front frame workpiece 1 in the next round of work. During this process, because the jetting head 401 needs to be guided by the slip ring 409 to a position that can be concealed within the middle area of ​​the fixed mold base 15 in a certain area along the width direction of the front frame workpiece 1, there are areas where the jetting head 401 cannot directly jet. However, since the gas can scour the surrounding area along the cavity 14, simply keeping the jetting head 401 near that area for a sufficient time can still achieve the desired scour effect. Furthermore, the hot gas ejected by the jetting head 401 can preheat the cavity 14 in conjunction with the unit temperature control device 8, thus facilitating subsequent injection molding processes.

[0035] Please see Figure 8 and Figure 9The first sleeve 404 is provided with a first pull-back device 2 for pulling the air supply pipe 406. The first pull-back device 2 includes a first collar 201 fixedly installed on the first sleeve 404 and slidably installed with the air supply pipe 406. A first fixing plate 204 is fixedly installed on the air supply pipe 406. The first fixing plate 204 and the first collar 201 are connected by a first return spring 202. A first slide rod 203 is fixedly installed on the first collar 201 and slidably installed with the first fixing plate 204. The fixed mold base 15 is provided with a second pull-back device 3 for pulling the air supply pipe 406. The second pull-back device 3 includes a second collar 301 fixedly installed on the fixed mold base 15 and slidably installed with the air supply pipe 406. A second fixing plate 304 is fixedly installed on the air supply pipe 406. The second fixing plate 304 and the second collar 301 are connected by a second return spring 303. A second slide rod 302 is fixedly installed on the second collar 301 and slidably installed with the second fixing plate 304. The first pull-back device 2 and the second pull-back device 3 are designed to prevent the air supply pipe 406 from getting tangled on the jetting device 4 or the fixed mold base 15. When the rotating seat 405 rotates, it will cause the air supply pipe 406 to extend upwards from the bottom of the fixed mold base 15. If the first pull-back device 2 and the second pull-back device 3 are not provided, when the rotating seat 405 returns to its initial position, the air supply pipe 406 extending above the fixed mold base 15 will not be able to retract back below the fixed mold base 15. This part of the air supply pipe 406 may get tangled on the jetting device 4 or enter the mold closing area of ​​the fixed mold base 15 and the moving mold base 18 during subsequent injection molding operations, and may even directly interfere with the discharge of the front frame workpiece 1. With the first pull-back device 2 and the second pull-back device 3, when the rotating seat 405... When rotation begins, the air supply pipe 406 can still be pulled out from below the fixed mold base 15, but at the same time the first return spring 202 and the second return spring 303 will also be compressed. When the rotating seat 405 rotates back to the initial position, the first return spring 202 will drive the first fixed plate 204 away from the first collar 201 along the first slide bar 203, and the second return spring 303 will drive the second fixed plate 304 away from the second collar 301 along the second slide bar 302. This will cause the excess part of the air supply pipe 406 located above the fixed mold base 15 to be pulled back below the fixed mold base 15. This will effectively ensure the normal operation of the jetting device 4, ensure normal mold closing between the fixed mold base 15 and the moving mold base 18, and will not delay the normal discharge of the front frame workpiece 1.

[0036] Please see Figure 1 , Figure 2 , Figure 3 , Figure 5 and Figure 6A second ejector rod 20 is fixedly mounted on the moving mold base 18, and the output end of the second ejector rod 20 drives a second ejector pin 24 for separating the moving mold base 18 from the front frame workpiece 1. The second ejector rod 20 is electrically connected to an external injection molding machine controller. The ejector device 7 includes a push plate 702, and at least one pair of first ejector pins 703 for ejecting the front frame workpiece 1 out of the cavity 14 are fixedly mounted on the push plate 702. The push plate 702 and the first ejector pins 703 are connected by a third return spring 701. The fixed mold base 15 is fixed to the injection molding machine via a fixing bracket 26, and a first ejector pin 19 is fixedly installed on the fixing bracket 26. The output end of the first ejector pin 19 drives the ejector plate 702 to move, and the first ejector pin 19 is electrically connected to the external injection molding machine controller. When it is necessary to open the mold and remove the front frame workpiece 1, the moving mold base 18 is first driven away from the fixed mold base 15 by the mold opening ejector pin 21. During this process, the second ejector pin 20 drives the second ejector pin 24 to press the front frame workpiece 1 into the cavity 14. This allows for the separation of the front frame workpiece 1 from the moving mold base 18. When the moving mold base 18 and the fixed mold base 15 reach their maximum distance, the second ejector pin 24 is driven to retract to the non-working position by the second push rod 20. This effectively prevents the second ejector pin 24 from delaying the subsequent material discharge of the front frame workpiece 1. Subsequently, the push plate 702 is driven to move by the first push rod 19, and the push plate 702 pushes the first ejector pin 703 to push the front frame workpiece 1 out of the cavity 14, thus completing the material discharge process of the front frame workpiece 1. During this process, corresponding first ejector pins 703 are provided at the four corners of the front frame workpiece 1. Corresponding first ejector pins 703 can also be provided in other areas of the front frame workpiece 1 as needed. This allows multiple first ejector pins 703 to be used to simultaneously eject various areas of the front frame workpiece 1, effectively preventing bending deformation or even jamming in the cavity 14 due to uneven force on the front frame workpiece 1 during ejection, thus effectively improving production quality.

[0037] The injection mold designed in this embodiment can better assist the filling of plastic raw materials and the cooling of the front frame workpiece 1 through the unit temperature control device 8, and remove impurities through the jetting device 4 to avoid impurities affecting the production quality of the front frame workpiece 1. Therefore, it can effectively prevent the front frame workpiece 1 from deforming, cracking, and dimensional instability, thereby solving the quality problems that the front frame workpiece is prone to during injection molding due to uneven cooling, and can effectively improve the production quality of the product.

[0038] Example 2: Please refer to Figure 1 , Figure 2 , Figure 3 , Figure 5 , Figure 6 and Figure 7Based on Embodiment 1, a side push rod 25 is fixedly installed at the top center of the moving mold base 18, and the output end of the side push rod 25 is fixedly installed with the fixed mold base 15. A side locking device 6 for locking the moving mold base 18 and the fixed mold base 15 is provided at the bottom center of the moving mold base 18. The side locking device 6 includes a connecting platform 605 fixedly installed with the moving mold base 18, and a locking push rod 601 is rotatably installed on the connecting platform 605. A gear ring 604 is fixedly installed on the locking push rod 601, and the output end of the locking push rod 601 is... The output end is driven by a locking plate 606. A docking platform 11 corresponding to and locked with the locking plate 606 is fixedly installed on the fixed mold base 15. A locking adjustment motor 602 is fixedly installed on the connecting platform 605. The output end of the locking adjustment motor 602 drives a drive wheel 603 that meshes with the gear ring 604. The locking adjustment motor 602 is used to drive the locking plate 606 to rotate to the position locked with the docking platform 11. The locking adjustment motor 602, the side push rod 25 and the locking push rod 601 are all electrically connected to the external injection molding machine controller.During injection molding, if the mold base 15 and the moving mold base 18 do not close tightly, problems such as flash, internal defects, and unstable workpiece dimensions may occur. Traditional injection molds generally only have corresponding pushing mechanisms at the four corners of the mold to maintain the mold base 15 and the moving mold base 18. However, considering that the front frame workpiece 1 has a longer upper and lower frame area, it is more prone to insufficient mold closing pressure. Therefore, we added a side locking device 6 and a side push rod 25 to provide additional mold closing pressure. The side push rod 25 plays a role and is used in a specific way. The method is the same as that of the mold opening push rod 21, but the side locking device 6 needs to deal with more complex situations. Specifically, after the mold is opened, the front frame workpiece 1 needs to be discharged from under the fixed mold base 15. If the side locking device 6 is always fixed between the moving mold base 18 and the fixed mold base 15, then the side locking device 6 will prevent the normal discharge of the front frame workpiece 1. Therefore, the side locking device 6 needs to adjust its position according to different stages of processing. When the mold needs to be closed, the locking push rod 601 first pushes the locking plate 606 to a position that facilitates docking with the docking table 11. Then, the locking adjustment motor 602 drives the locking push rod 601 and the locking plate 606 to rotate, so that the locking plate 606 enters the position that can be locked with the docking table 11. Then, the locking push rod 601 drives the locking plate 606 to lock correctly with the docking table 11. In this way, the locking push rod 601 can provide the corresponding mold closing pressure for the fixed mold base 15 and the moving mold base 18. When the fixed mold base 15 and the moving mold base 18 need to open the mold, the locking push rod 601 first releases the locking plate 606 from the docking table 11, and then the locking adjustment motor 602 drives the locking push rod 601 to rotate, so that the locking plate 606 can be locked with the docking table 11. Machine 602 rotates the locking plate 606 to a non-working angle, and then moves the locking plate 606 to the non-working area on the moving mold base 18 via the locking push rod 601. In this way, when it is necessary to remove the front frame workpiece 1, the side locking device 6 will not obstruct the movement of the front frame workpiece 1. This ensures that sufficient mold closing pressure is provided for the fixed mold base 15 and the moving mold base 18 without affecting normal production. It further solves the problem that the front frame workpiece is prone to quality problems during injection molding due to uneven cooling, and can effectively improve the production quality of the product.

[0039] Example 3: Please refer to Figure 1 , Figure 2 , Figure 5 and Figure 6Based on Embodiment 2, guide holes 17 are provided at the four corners of the moving mold base 18, and guide rods 16 are slidably installed on the fixed mold base 15 with respect to the guide holes 17. A lubrication device 5 for lubricating the guide rods 16 is provided on the moving mold base 18. The lubrication device 5 includes a spiral lubrication channel 501 disposed within the guide holes 17 and directly contacting the surface of the guide rods 16. A supply pipe 502 and a drain pipe 505 are respectively connected to both ends of the spiral lubrication channel 501. The supply pipe 502 and the drain pipe 505 are connected to an external lubricating oil circulation supply device. A supply valve 503 is installed on the supply pipe 502, and a drain valve 504 is installed on the drain pipe 505. The fixed mold base 15 and the moving mold base 18... At the corresponding positions of the guide rod 16, stepped surfaces 9 are provided to prevent lubricating oil from overflowing into the contact area between the moving mold base 18 and the fixed mold base 15. After prolonged operation, mechanical fatigue can cause deformation of the end of the mold opening push rod 21, leading to misalignment during mold closing. This misalignment affects the size and shape of the front frame workpiece 1 and may even damage the moving mold base 18 and the fixed mold base 15. In the prior art, guide rods 16 are used to cooperate with guide holes 17 to guide the moving mold base 18 and the fixed mold base 15 for correct mold closing. However, friction occurs between the guide rod 16 and the inner wall of the guide hole 17, gradually wearing down the guide rod 16. After prolonged use, the guide rod 16 will wear down and fail to provide proper guidance. Traditionally, lubrication is achieved by manually applying lubricating oil to the guide rod 16. However, because the guide rod 16 is constantly exposed to high temperatures and the surface lubricating oil is directly exposed to air, the lubricating oil evaporates quickly, leading to a decrease in lubrication effectiveness. This necessitates operators to repeatedly apply lubricating oil periodically, significantly increasing their workload. Furthermore, forgetting to apply lubricating oil can cause wear problems, introducing significant uncontrollable factors. In this embodiment, the lubrication device 5 automatically provides lubricating oil to the guide rod 16. The lubricating oil is initially supplied by an external lubricating oil... The circulating supply equipment supplies lubricating oil to the spiral lubrication channel 501 through the supply pipe 502. The inner side of the spiral lubrication channel 501 is in direct contact with the guide rod 16, so that the lubricating oil can be evenly coated on the surface of the guide rod 16 as it moves along the guide hole 17, thus meeting the lubrication requirements of the guide rod 16. Subsequently, excess lubricating oil is recycled back to the external lubricating oil circulating supply equipment by the drain pipe 505, thereby ensuring that the lubricating oil can be normally circulated and supplied. This effectively reduces the wear on the guide rod 16, and thus ensures that the guide rod 16 can be used normally to avoid the problem of mold misalignment when the fixed mold base 15 and the moving mold base 18 are closed, ensuring the production quality of the front frame workpiece 1.Furthermore, stepped surfaces 9 are provided on the fixed mold base 15 and the moving mold base 18, which are not on the same plane as the contact surfaces of the moving mold base 18 and the fixed mold base 15 during the mold closing process. This allows lubricating oil overflowing from the guide rod 16 to collect on the stepped surfaces 9 and not enter the contact area between the moving mold base 18 and the fixed mold base 15, thus avoiding the influence of lubricating oil on the mold closing process. Simultaneously, the lubricating oil collected on the stepped surfaces 9 can naturally drip onto the ground under gravity or be cleaned up by maintenance personnel, thus facilitating maintenance. This further solves the problem of quality issues in the front frame workpiece during injection molding due to uneven cooling, effectively improving product production quality.

[0040] Example 4: Based on Example 3, the present invention also provides a method for using an injection mold for a flat panel TV frame, comprising the following steps:

[0041] Step 1: First, the fixed mold base 15 and the moving mold base 18 are separated to the maximum distance by the mold opening push rod 21. Then, the inside of the cavity 14 is cleaned by air jetting using the air jetting device 4. After that, the fixed mold base 15 and the moving mold base 18 are closed and locked by the side locking device 6.

[0042] Step 2: Heat the cavity 14 using the unit temperature control device 8, and then fill the cavity 14 with molten plastic material through the injection molding machine. After filling, cool the plastic material inside the cavity 14 using the unit temperature control device 8.

[0043] Step 3: After the plastic raw material has cooled and formed the front frame workpiece 1, drive the side locking device 6 to the non-working position, and then separate the moving mold base 18 and the fixed mold base 15 again by the mold opening push rod 21. At the same time, use the second ejector pin 24 to separate the front frame workpiece 1 from the moving mold base 18, and then use the first ejector pin 703 to eject the front frame workpiece 1 from the cavity 14 to complete the injection molding process of the front frame workpiece 1.

[0044] Although the illustrative specific embodiments of this application have been described above to enable those skilled in the art to understand this application, this application is not limited to the scope of the specific embodiments. For those skilled in the art, all applications utilizing the concept of this application are protected as long as various variations are within the spirit and scope of this application as defined and determined by the appended claims.

Claims

1. An injection mold for a flat-panel TV frame, characterized in that, include: A fixed mold base (15) is provided with a cavity (14) for forming the front frame workpiece (1), and a movable mold base (18) is provided on the left side of the fixed mold base (15) to cooperate with the fixed mold base (15). The fixed mold base (15) is provided with a pressing device (7) for ejecting the front frame workpiece (1) from the cavity (14), and both the movable mold base (18) and the fixed mold base (15) are provided with mounting cavities (13) at positions corresponding to the cavity (14). The movable mold base (18) is fixedly mounted with... A mold-opening ejector (21) is provided, and the output end of the mold-opening ejector (21) is fixedly installed on a fixed mold base (15). A main runner (22) that connects to the nozzle of the injection molding machine is fixedly installed on the fixed mold base (15). The main runner (22) injects molding material into the cavity (14) through at least one pair of branch runners (23). An air jetting device (4) for air jetting and cleaning the cavity (14) is provided on the fixed mold base (15). The air jetting device (4) includes a rotary motor (411) fixedly installed at the center of the fixed mold base (15). The output end of the rotary motor (411) drives a position adjustment push rod (410), the output end of which drives a rotating seat (405). A first sleeve (404) is symmetrically arranged on the rotating seat (405), and a first sleeve rod (403) is slidably installed inside the first sleeve (404). An air jet seat (402) is fixedly installed at the end of the first sleeve rod (403), and an air jet head (401) for air jet cleaning into the cavity (14) is fixedly installed on the air jet seat (402). The air head (401) is connected to an external air supply device through an air supply pipe (406), and a guide rail (12) is installed on the fixed mold base (15). A second sleeve (407) is fixedly installed at the end of the first sleeve rod (403), and a second sleeve rod (408) is slidably installed inside the second sleeve rod (407). A slip ring (409) that slides along the guide rail (12) is rotatably installed at the bottom of the second sleeve rod (408), and the rotary motor (411) and the position adjustment push rod (410) are both electrically connected to the external injection molding machine controller. Unit temperature control device (8), at least one unit temperature control device (8) is provided in the mounting cavity (13), and the unit temperature control device (8) includes a heat exchange shell (801) fixedly installed in the mounting cavity (13) and attached to the inner wall of the mounting cavity (13). The interior of the heat exchange shell (801) is divided by at least one thermally conductive baffle (806) to form at least two unit flow channels (807). The beginning and end ends of the unit flow channels (807) located on the same unit temperature control device (8) are connected to the inlet pipe (802) and the outlet pipe (808) respectively. The inlet pipe (802) and the outlet pipe (808) are connected to an external coolant supply device. A heater (805) is installed on the heat exchange shell (801), and the heat output end of the heater (805) is connected to the thermally conductive baffle (806). The mold opening push rod (21) and the heater (805) are both electrically connected to an external injection molding machine controller.

2. The injection mold for a flat-panel TV frame according to claim 1, characterized in that: The first sleeve (404) is provided with a first pull-back device (2) for pulling the air supply pipe (406), and the first pull-back device (2) includes a first collar (201) fixedly installed on the first sleeve (404) and slidably installed with the air supply pipe (406). A first fixing plate (204) is fixedly installed on the air supply pipe (406), and the first fixing plate (204) and the first collar (201) are connected by a first return spring (202). A first slide rod (203) is fixedly installed on the first collar (201) and slidably installed with the first fixing plate (204).

3. The injection mold for a flat-panel TV frame according to claim 1, characterized in that: The fixed mold base (15) is provided with a second pull-back device (3) for pulling the air supply pipe (406). The second pull-back device (3) includes a second collar (301) fixedly installed on the fixed mold base (15) and slidably installed on the air supply pipe (406). A second fixing plate (304) is fixedly installed on the air supply pipe (406). The second fixing plate (304) and the second collar (301) are connected by a second return spring (303). A second slide rod (302) is fixedly installed on the second collar (301) and slidably installed on the second fixing plate (304).

4. The injection mold for a flat-panel TV frame according to claim 1, characterized in that: A camera (10) for acquiring images of the cavity (14) is fixedly installed on the jet seat (402), and the camera (10) is electrically connected to the external injection molding machine controller.

5. The injection mold for a flat-panel TV frame according to claim 1, characterized in that: A side push rod (25) is fixedly provided at the top center of the moving mold base (18), and the output end of the side push rod (25) is fixedly installed with the fixed mold base (15). A side locking device (6) for locking the moving mold base (18) and the fixed mold base (15) is provided at the bottom center of the moving mold base (18). The side locking device (6) includes a connecting platform (605) fixedly installed with the moving mold base (18), and a locking push rod (601) is rotatably installed on the connecting platform (605). A gear ring (604) is fixedly installed on the locking push rod (601), and the output end of the locking push rod (601) drives... A locking plate (606) is fixedly installed on the fixed mold base (15), and a docking platform (11) corresponding to and clamping the locking plate (606) is fixedly installed on the connecting platform (605). A locking adjustment motor (602) is fixedly installed on the connecting platform (605), and the output end of the locking adjustment motor (602) drives a drive wheel (603) that meshes with the gear ring (604). The locking adjustment motor (602) is used to drive the locking plate (606) to rotate to the position where it is locked with the docking platform (11). The locking adjustment motor (602), the side push rod (25) and the locking push rod (601) are all electrically connected to the external injection molding machine controller.

6. The injection mold for a flat-panel TV frame according to claim 1, characterized in that: The moving mold base (18) has guide holes (17) at its four corners, and a guide rod (16) is fixedly installed on the fixed mold base (15) and slidably installed with the guide holes (17). The moving mold base (18) is provided with a lubrication device (5) for lubricating the guide rod (16), and the lubrication device (5) includes a spiral lubrication channel (501) disposed in the guide hole (17) and directly attached to the surface of the guide rod (16). The two ends of the spiral lubrication channel (501) are respectively connected to a liquid supply. The supply pipe (502) and drain pipe (505) are connected to an external lubricating oil circulation supply device. A supply valve (503) is installed on the supply pipe (502) and a drain valve (504) is installed on the drain pipe (505). The fixed mold base (15) and the moving mold base (18) are respectively provided with stepped surfaces (9) at the corresponding guide rod (16) to prevent lubricating oil from overflowing to the contact position of the moving mold base (18) and the fixed mold base (15).

7. The injection mold for a flat-panel TV frame according to claim 1, characterized in that: A second top-pressing push rod (20) is fixedly installed on the moving mold base (18), and the output end of the second top-pressing push rod (20) drives a second ejector pin (24) for separating the moving mold base (18) from the front frame workpiece (1). The second top-pressing push rod (20) is electrically connected to an external injection molding machine controller.

8. The injection mold for a flat-panel TV frame according to claim 1, characterized in that: The top pressing device (7) includes a push plate (702), and at least one pair of first ejector pins (703) for ejecting the front frame workpiece (1) out of the cavity (14) are fixedly installed on the push plate (702). The push plate (702) and the first ejector pins (703) are connected by a third return spring (701). The fixed mold base (15) is fixed to the injection molding machine by a fixed frame (26), and a first top pressing push rod (19) is fixedly installed on the fixed frame (26). The output end of the first top pressing push rod (19) drives the push plate (702) to move, and the first top pressing push rod (19) is electrically connected to the external injection molding machine controller.

9. The injection mold for a flat-panel TV frame according to claim 1, characterized in that: The first ends of all unit flow channels (807) located within the same unit temperature control device (8) are connected to the inlet pipe (802) through the front cavity (803), and the tail ends of all unit flow channels (807) located within the same unit temperature control device (8) are connected to the outlet pipe (808) through the rear cavity (809). Both the front cavity (803) and the rear cavity (809) are equipped with flow dividers (804), and each flow divider... (804) is provided with at least three diversion holes (810) at equal intervals connecting the upper and lower ends of the diversion plate (804). The diversion hole (810) located in the front cavity (803) is farther from the end of the inlet pipe (802) and the cross-section of the diversion hole (810) is larger. The diversion hole (810) located in the rear cavity (809) is farther from the outlet pipe (808) and the cross-section of the diversion hole (810) is larger.

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