Push-pull sliding rail type automatic core-pulling demolding mechanism and injection mold

Abstract

The invention relates to the technical field of injection molds, and discloses a push-pull slide rail type automatic core-pulling demolding mechanism and an injection mold, the push-pull slide rail type automatic core-pulling demolding mechanism comprises a mold frame, a movable mold is fixedly mounted on one side of the mold frame, a fixed mold is arranged on one side of the movable mold, and a core module is arranged between the movable mold and the fixed mold; a push-pull sliding rail mechanism, an ejector rod material returning guide mechanism and a mold core auxiliary cooling assembly are arranged between the mold frame and the mold core module. By arranging the push-pull slide rail mechanism, an independent guide reference is formed on the basis of accurate matching of the core-pulling slide rail and the core-pulling slide block, track deviation caused by direct friction between the slide block and a cavity is avoided, and the requirement of a high-precision plastic part is met; meanwhile, the oil storage bottle supplies oil to the oil cavity on the inner side of the core-pulling sliding rail through the oil pipe, the roller on the top of the core-pulling sliding rail can evenly bring lubricating oil to the contact face when sliding, automatic lubrication is achieved, manual regular maintenance is not needed, sliding friction is converted into rolling friction through the roller, the abrasion rate is greatly reduced, the service life is prolonged, and high-frequency continuous production is adapted.

Description

Technical Field

[0001] The present invention relates to the technical field of injection molds, and particularly to a push-pull slide rail type automatic core-pulling and demolding mechanism and an injection mold. Background Technique

[0002] As the core equipment for the industrial production of plastic products, injection molds are widely used in many fields such as household appliances, automotive parts, electronic communications, and medical devices. Their performance directly determines the molding accuracy, production efficiency, and manufacturing cost of plastic parts. During the injection molding process, the mold needs to go through key processes such as mold closing, melt injection, pressure holding, cooling and solidification, and demolding. For plastic parts with side recesses, side holes, snap fits, or complex inner cavity structures, such as automotive interior snap fit parts and side hole parts of electronic enclosures, the core of the complex structure must be pulled out of the plastic part by a core-pulling and demolding mechanism before demolding. Otherwise, problems such as tearing, deformation, or getting stuck in the mold may occur during demolding. Therefore, the core-pulling and demolding mechanism is a core component of injection molds for complex plastic parts. The following problems exist when the existing mold performs core-pulling and demolding: With the continuous improvement of the requirements for the accuracy and production efficiency of plastic parts in the manufacturing industry, the core-pulling and demolding mechanisms supporting existing injection molding machines have gradually revealed problems of insufficient adaptability. Currently, the mainstream core-pulling and demolding mechanisms mostly adopt a hydraulic-driven slider structure, and the core is pulled out by directly pushing the core-pulling slider with a hydraulic cylinder. Some simple molds even rely on manual-assisted core-pulling. In actual applications, although these mechanisms can meet the basic core-pulling requirements, there are still obvious shortcomings in terms of guiding accuracy, lubrication and maintenance, cooling efficiency, and ejection reliability, and it is difficult to adapt to the high-precision and high-tempo modern injection molding production requirements. It is urgent to upgrade the performance through structural optimization.

[0003] Most existing mechanisms rely solely on the clearance fit between the slider and the mold cavity for guidance, lacking an independent high-precision guiding structure. During long-term, high-frequency core-pulling operations, uneven wear can easily occur between the slider and the inner wall of the cavity, leading to deviation of the core-pulling trajectory. This, in turn, causes the positional accuracy of structures such as side holes and clips in the plastic part to exceed tolerances. This is especially true for thin-walled, high-precision plastic parts, where core-pulling deviation can easily lead to the scrapping of the plastic part. While some mechanisms using a single guide rail offer slight improvements, they do not solve the problem of high sliding friction resistance. Long-term use and wear of the guide rail still lead to decreased accuracy. Secondly, existing core-pulling mechanisms rely heavily on manual, periodic application of lubricating oil or grease. This not only requires maintenance during production breaks but is also prone to errors due to human error or uneven lubrication, causing the slider to jam or even seize up, failing to meet continuous production demands. Furthermore, existing mold cooling systems are mostly concentrated on the outer walls of the moving and fixed mold cavities, cooling the outer surface of the plastic part through cooling water channels. However, for cores with complex internal cavities or deep structures, effective cooling methods are often lacking. Finally, existing ejection mechanisms often use a single ejector pin to eject the plastic part. After ejection, the part often falls freely due to the lack of a guiding structure, easily colliding with mold components or conveying devices, resulting in edge damage or surface scratches. Therefore, improvements are needed. Summary of the Invention

[0004] The purpose of this invention is to provide a push-pull slide rail type automatic core-pulling and demolding mechanism and injection mold to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A push-pull slide rail type automatic core pulling and demolding mechanism includes a mold frame, a movable mold fixedly installed on one side of the mold frame, a fixed mold provided on one side of the movable mold, a core module provided between the movable mold and the fixed mold, and a push-pull slide rail mechanism, an ejector pin material ejection guide mechanism and a core auxiliary cooling assembly provided between the mold frame and the core module; The push-pull slide rail mechanism is located on one side of the mold frame. The push-pull slide rail mechanism includes several core-pulling slide rails and several core-pulling sliders. The core-pulling sliders installed on the core module slide on the core-pulling slide rails to provide precise guidance during core pulling. The ejector pin ejection guide mechanism is located between the mold frame and the moving mold. The ejector pin ejection guide mechanism is equipped with an ejection hopper, so that when ejecting material, the material falls into the inner side of the ejection hopper for ejection guidance. The core auxiliary cooling component is disposed between the mold frame and the core module. The core auxiliary cooling component cools the workpiece by opening a coolant cavity in the core of the core module, through which the coolant cools from the inside, thus assisting the cooling systems of the moving mold and the fixed mold in forming the workpiece.

[0006] Optionally, the push-pull slide rail mechanism further includes an oil cavity, several rollers, an oil pipe, and an oil storage bottle. The oil cavity is located inside the core-pulling slide rail. Several rollers are rotatably connected to the top of the core-pulling slide rail. The oil pipe is fixedly installed at one end of the core-pulling slide rail. The oil storage bottle is fixedly installed at one end of the oil pipe. Two core-pulling slide rails are fixedly installed on both sides of the mold frame. The core-pulling slider is slidably connected to the outside of the core-pulling slide rail.

[0007] Optionally, several rollers are arranged linearly on the top of the core-pulling slide rail, with the bottom of the rollers located inside the oil cavity and the upper surface of the rollers located inside the core-pulling slider. One end of the oil pipe is connected to the inside of the oil cavity, and the other end of the oil pipe is connected to the inside of the oil storage bottle. One end of the oil storage bottle is provided with an air hole.

[0008] Optionally, the core module includes a mounting frame, a first hydraulic cylinder, a core fixing plate, a mold cavity core, a first fixing plate, a push-pull rod, a top block, a snap-fit ​​groove, a snap-fit ​​core, a first return spring, and a conical block. The mounting frame is fixedly mounted on the top of the mold frame, the first hydraulic cylinder is fixedly mounted on one side of the mounting frame, the core fixing plate is located at one end of the first hydraulic cylinder, the mold cavity core is fixedly mounted on one side of the core fixing plate, the first fixing plate is fixedly mounted at one end of the first hydraulic cylinder, one end of the push-pull rod is fixedly mounted on one side of the first fixing plate, the top block is fixedly mounted at one end of the push-pull rod, the snap-fit ​​groove is formed on the upper and lower sides of the mold cavity core, one end of the snap-fit ​​core is slidably connected to the inner side of the snap-fit ​​groove, the first return spring is sleeved on the outer wall of the snap-fit ​​core, and the conical block is fixedly connected to one end of the push-pull rod.

[0009] Optionally, one end of the mold cavity core is slidably connected between the moving mold and the fixed mold, one end of the push-pull rod passes through the core fixing plate and is slidably connected inside the mold cavity core, one end of the top block abuts against one end of the mold cavity core during injection molding, one end of the first return spring abuts against the inner surface of the mold cavity core, the other end of the first return spring abuts against the inner side of one end of the snap-fit ​​core, and the conical block is located between the two snap-fit ​​cores, with the outer surface of the conical block abutting against the surface of one end of the snap-fit ​​core.

[0010] Optionally, the core auxiliary cooling assembly further includes several water pipe interfaces, a coolant tank, a liquid pump, a suction pipe, and a supply pipe. The water pipe interfaces are respectively installed on the top and bottom of the core fixing plate. The coolant tank is fixedly installed on one side of the mold frame. The liquid pump is fixedly installed on one side of the mold frame. The suction pipe is fixedly installed at one end of the supply pipe at the suction end and the output end of the liquid pump. The coolant chamber is opened inside the side wall of the mold core. The other end of the suction pipe is connected to the inside of the coolant tank.

[0011] Optionally, one end of the water pipe interface located at the bottom of the core fixing plate is connected to the coolant chamber output end, and the other end of the water pipe interface located at the bottom of the core fixing plate is connected to one end of the liquid supply pipe through a pipe. One end of the water pipe interface located at the top of the core fixing plate is connected to the coolant chamber output port, and the other end of the water pipe interface located at the top of the core fixing plate is connected to the inside of the coolant tank through a pipe.

[0012] Optionally, the ejector guide mechanism further includes several support slide rods, an ejector fixing plate, an ejector ejector rod, a second hydraulic cylinder, a second return spring, a fixing ear, and several ejector rollers. One end of each of the support slide rods is fixedly installed on one side of the moving mold. The ejector fixing plate is slidably connected to the outer wall of the support slide rods. One end of the ejector ejector rod is fixedly installed on one side of the ejector fixing plate. The second hydraulic cylinder is fixedly installed on one side of the mold frame. The second return spring is sleeved on the outer wall of the support slide rod. The fixing ear is fixedly installed on one side of the ejector fixing plate. The several ejector rollers are rotatably connected to the inner side of the ejector hopper. One side of the ejector hopper is fixedly connected to one end of the fixing ear. The ejector hopper is located at the bottom of the moving mold.

[0013] Optionally, one end of the ejector pin is fixedly installed in the middle of the ejector pin fixing plate, one end of the second return spring abuts against one side of the ejector pin fixing plate, the other end of the second return spring abuts against one side of the moving mold, a plurality of ejector rollers are evenly distributed inside the ejector hopper, one end of the ejector pin is slidably connected inside the moving mold, and one end of the ejector pin is located inside the moving mold.

[0014] An injection mold, comprising any one of the push-pull slide rail type automatic core-pulling and demolding mechanisms described in any one of the claims.

[0015] The present invention has at least the following beneficial effects: (1) This solution sets up a push-pull slide rail mechanism. Specifically, based on the precise matching between the core-pulling slide rail and the core-pulling slider, an independent guide reference is formed to avoid trajectory deviation caused by direct friction between the slider and the cavity, thus meeting the requirements of high-precision plastic parts. At the same time, the oil storage bottle continuously supplies oil to the oil cavity inside the core-pulling slide rail through the oil pipe. When the roller at the top of the core-pulling slide rail slides, it can evenly carry the lubricating oil to the contact surface to achieve automatic lubrication. There is no need for regular manual maintenance. Moreover, the roller converts sliding friction into rolling friction, which greatly reduces the wear rate, extends the service life of the mechanism, and is suitable for high-frequency continuous production. (2) This solution sets up a core module. Specifically, the first hydraulic cylinder drives the push-pull rod to move the conical block synchronously. The conical block controls the extension and retraction of the snap-fit ​​core in the snap-fit ​​groove through the inclined surface cooperation: during injection molding, the conical block pushes the snap-fit ​​core out and the molded plastic part is snapped; during core pulling, the hydraulic cylinder drives the conical block to retract, and the snap-fit ​​core automatically retracts under the action of the first reset spring, avoiding snap-fit ​​breakage caused by traditional forced core pulling; at the same time, the top block presses against the inside of the mold cavity core during injection molding to ensure the integrity of the core molding surface and further improve the precision of the plastic part, especially suitable for complex structure plastic parts such as automotive interior snap-fit ​​parts and electronic housings; (3) This solution sets up a core auxiliary cooling component. Specifically, the cooling liquid cavity of the core side wall of the mold cavity is used to form a circulation with the liquid pump and the cooling liquid tank. The cooling liquid absorbs heat from the inside of the core and is combined with the external cooling of the moving mold and the fixed mold to make the internal and external cooling rates of the plastic part consistent, which shortens the molding cycle, reduces defects such as shrinkage marks and warping, improves the qualification rate of plastic parts, and is suitable for the production of deep cavity, thin wall and high precision plastic parts. (4) This solution is equipped with a push rod ejection guide mechanism. Specifically, the second hydraulic cylinder drives the ejection push rod to accurately eject the plastic part along the support slide rod, and the second reset spring ensures that the push rod action is stable and reliable. The ejection hopper receives the plastic part, and the inner ejection roller guides the plastic part to slide down smoothly, avoiding collision damage caused by free fall. The ejection and core pulling actions are coordinated by the hydraulic system, without the need for manual intervention, which significantly improves production efficiency and product quality. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Figure 1 This is a schematic diagram of the front structure of the present invention; Figure 2 This is a schematic diagram of the top side structure of the present invention; Figure 3 This is a schematic diagram of the rear structure of the present invention; Figure 4 This is a partial structural diagram of the push-pull slide rail mechanism of the present invention; Figure 5 This is a schematic diagram of the material ejection guide mechanism of the present invention; Figure 6 This is a schematic diagram of the unloading hopper structure of the present invention; Figure 7 This is a schematic diagram of the core module structure of the present invention; Figure 8 For the present invention Figure 7 A magnified view of a portion of point A in the middle.

[0017] The attached diagram lists the components represented by each number as follows: 1. Mold frame; 2. Moving mold; 3. Fixed mold; 4. Core module; 401. Mounting bracket; 402. First hydraulic cylinder; 403. Core fixing plate; 404. Mold cavity core; 405. First fixing plate; 406. Push-pull rod; 407. Ejector block; 408. Snap-on slide groove; 409. Snap-on core; 410. First return spring; 411. Conical block; 501. Core-pulling slide rail; 502. Core-pulling slider; 503. Oil cavity 504. Roller; 505. Oil pipe; 506. Oil reservoir; 601. Support slide bar; 602. Top rod fixing plate; 603. Unloading top rod; 604. Second hydraulic cylinder; 605. Second return spring; 606. Fixing lug; 607. Unloading hopper; 608. Unloading roller; 701. Coolant chamber; 702. Water pipe interface; 703. Coolant tank; 704. Liquid pump; 705. Suction pipe; 706. Liquid supply pipe. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on 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.

[0019] Please see Figures 1-8 The present invention provides a push-pull slide rail type automatic core pulling and demolding mechanism, including a mold frame 1, a movable mold 2 fixedly installed on one side of the mold frame 1, a fixed mold 3 provided on one side of the movable mold 2, a core module 4 provided between the movable mold 2 and the fixed mold 3, and a push-pull slide rail mechanism, an ejector pin material ejection guide mechanism and a core auxiliary cooling assembly provided between the mold frame 1 and the core module 4. The push-pull slide rail mechanism is located on one side of the mold frame 1. The push-pull slide rail mechanism includes several core-pulling slide rails 501 and several core-pulling sliders 502. The core-pulling sliders 502 installed on the core module 4 slide on the core-pulling slide rails 501 to provide precise guidance during core pulling. In some embodiments, see Figure 1 , Figure 4The push-pull slide rail mechanism also includes an oil cavity 503, several rollers 504, an oil pipe 505, and an oil storage bottle 506. The oil cavity 503 is located inside the core-pulling slide rail 501. Several rollers 504 are rotatably connected to the top of the core-pulling slide rail 501. The oil pipe 505 is fixedly installed at one end of the core-pulling slide rail 501. The oil storage bottle 506 is fixedly installed at one end of the oil pipe 505. Two core-pulling slide rails 501 are fixedly installed on both sides of the mold frame 1. The core-pulling slider 502 is slidably connected to the outside of the core-pulling slide rail 501. Several rollers 504 are arranged linearly on the top of the core-pulling slide rail 501. The bottom of the rollers 504 is located inside the oil cavity 503. The upper surface of the rollers 504 is located inside the core-pulling slider 502. One end of the oil pipe 505 is connected to the inside of the oil cavity 503. The other end of the oil pipe 505 is connected to the inside of the oil storage bottle 506. An air hole is provided at one end of the oil storage bottle 506.

[0020] The vent at one end of the oil reservoir 506 balances the internal pressure, ensuring that the lubricating oil between the oil chamber 503 and the oil reservoir 506 is continuously supplied to the oil chamber 503 under gravity, preventing oil supply interruption due to negative pressure in the oil chamber 503. The roller 504 is made of high-hardness bearing steel, and its bottom is embedded in the oil chamber 503. It can pick up lubricating oil when rotating and spread the lubricating oil evenly on the mating surfaces of the core-pulling slide rail 501 and the core-pulling slide rail 502 through contact with the core-pulling slider 502, forming a stable oil film. The two core-pulling slide rails 501 are symmetrically distributed on both sides of the mold frame 1, corresponding one-to-one with the core-pulling slider 502 at the bottom of the core module 4. They can simultaneously constrain the core-pulling trajectory of the core module 4 from both sides, avoiding deviation caused by unilateral force. The oil pipe 505 is made of oil-resistant nitrile rubber or brass hard pipe, which can withstand the corrosion of lubricating oil and ensure the sealing of the oil supply channel, preventing oil leakage from contaminating the mold or affecting the lubrication effect.

[0021] This embodiment achieves improved guiding accuracy of the core-pulling action through a combined structure of double core-pulling slide rails 501 and rollers 504, solving the core-pulling offset problem caused by existing single slide rails or the absence of independent guiding mechanisms. Simultaneously, the automatic oil supply system of oil reservoir 506, oil pipe 505, and oil chamber 503 ensures continuous lubrication of the mating surfaces of the core-pulling slide rails 501 and the core-pulling slider 502, eliminating the need for manual periodic lubrication and extending the maintenance cycle to 6-12 months. Furthermore, the rollers 504 convert sliding friction into rolling friction, reducing resistance and decreasing wear on the core-pulling slide rails 501 and the core-pulling slider 502, thus extending the service life of the mechanism and adapting to the needs of high-frequency continuous core-pulling production.

[0022] Optionally, the number of rollers 504 can be flexibly set according to the length of the core-pulling slide rail 501, usually 6-12; the capacity of the oil reservoir 506 can be selected as 200ml, but for molds with an average daily production time of more than 10 hours, an oil reservoir 506 with a capacity of 150-200ml is preferred to reduce the frequency of oil replenishment; in addition, a manual valve can be added to the oil pipe 505 to facilitate cutting off the oil supply during mold maintenance and prevent lubricating oil leakage.

[0023] In some embodiments, see Figure 7 , Figure 8 The core module 4 includes a mounting bracket 401, a first hydraulic cylinder 402, a core fixing plate 403, a mold cavity core 404, a first fixing plate 405, a push-pull rod 406, a top block 407, a snap-fit ​​groove 408, a snap-fit ​​core 409, a first return spring 410, and a conical block 411. The mounting bracket 401 is fixedly mounted on the top of the mold frame 1. The first hydraulic cylinder 402 is fixedly mounted on one side of the mounting bracket 401. The core fixing plate 403 is located at one end of the first hydraulic cylinder 402. The mold cavity core 404 is fixedly mounted on one side of the core fixing plate 403. The first fixing plate 405 is fixedly mounted on one end of the first hydraulic cylinder 402. One end of the push-pull rod 406 is fixedly mounted on one side of the first fixing plate 405. The top block 407 is fixedly mounted on one end of the push-pull rod 406. The snap-fit ​​groove 408 is formed in the mold cavity. On the upper and lower sides of the core 404, one end of the snap-fit ​​core 409 is slidably connected to the inner side of the snap-fit ​​groove 408. The first return spring 410 is sleeved on the outer wall of the snap-fit ​​core 409. The conical block 411 is fixedly connected to one end of the push-pull rod 406. One end of the mold cavity core 404 is slidably connected between the moving mold 2 and the fixed mold 3. One end of the push-pull rod 406 passes through the core fixing plate 403 and is slidably connected inside the mold cavity core 404. One end of the top block 407 abuts against one end of the mold cavity core 404 during injection molding. One end of the first return spring 410 abuts against the inner surface of the mold cavity core 404, and the other end of the first return spring 410 abuts against the inner side of one end of the snap-fit ​​core 409. The conical block 411 is located between the two snap-fit ​​cores 409, and the outer surface of the conical block 411 abuts against one end of the surface of the snap-fit ​​core 409.

[0024] The mounting bracket 401 is made of welded steel plate, and its bottom is rigidly connected to the top of the mold frame 1 by bolts. It can withstand the axial thrust of the first hydraulic cylinder 402 when it is working, and avoid the core displacement caused by the deformation of the mounting bracket 401. The piston rod of the first hydraulic cylinder 402 is fixed to the first fixed plate 405 by flange, ensuring the stable transmission of the driving force of the push-pull rod 406. The push-pull rod 406 is made of 45 steel and has sufficient strength to push the tapered block 411 and the top block 407. The cross section of the snap-fit ​​groove 408 is T-shaped or dovetail-shaped, which matches the end shape of the snap-fit ​​core 409. It can limit the snap-fit ​​core 409 to slide only along the axial direction of the snap-fit ​​groove 408, and prevent it from falling off or shifting.

[0025] This embodiment achieves automatic extension and retraction of the snap-fit ​​core 409 through a linkage structure driven by the first hydraulic cylinder 402, the conical block 411, and the first return spring 410. During injection molding, the conical block 411 pushes the snap-fit ​​core 409 out of the mold cavity core 404, precisely forming the snap-fit ​​structure of the plastic part. During core pulling, the conical block 411 retracts with the push-pull rod 406, and the snap-fit ​​core 409 automatically retracts under the action of the first return spring 410, avoiding the problem of snap-fit ​​breakage or deformation of the plastic part caused by the traditional forced core pulling method, thus greatly improving the pass rate of snap-fit ​​plastic parts. At the same time, the fitting design of the top block 407 and the mold cavity core 404 ensures the sealing performance inside the mold cavity core 404, preventing molten material from overflowing, further improving the molding accuracy of the plastic part, and is especially suitable for the production of high-precision complex structure plastic parts such as automotive interior snap-fits and electronic device housing snap-fits.

[0026] Optionally, the extension length of the snap-fit ​​core 409 can be designed to be 3-10mm to accommodate snap-fit ​​parts of different sizes. In addition, a guide sleeve made of copper alloy can be added at the mating point between the push-pull rod 406 and the core fixing plate 403 to further improve the sliding accuracy of the push-pull rod 406 and reduce radial wobble.

[0027] The core auxiliary cooling component is located between the mold frame 1 and the core module 4. The core auxiliary cooling component cools the workpiece by opening a coolant cavity 701 in the core of the core module 4. The coolant is cooled from the inside through the coolant cavity 701, which assists the cooling systems of the moving mold 2 and the fixed mold 3 in forming the workpiece.

[0028] In some embodiments, referring to Figures 1 and 2, the core auxiliary cooling assembly further includes a plurality of water pipe interfaces 702, a coolant tank 703, a liquid pump 704, a suction pipe 705, and a supply pipe 706. The plurality of water pipe interfaces 702 are respectively installed on the top and bottom of the core fixing plate 403. The coolant tank 703 is fixedly installed on one side of the mold frame 1. The liquid pump 704 is fixedly installed on one side of the mold frame 1. The suction pipe 705 is fixedly installed at one end of the supply pipe 706 at the suction end and the output end of the liquid pump 704, respectively. The coolant cavity 701 is formed inside the side wall of the mold cavity core 404. The other end of the suction pipe 705 is connected to the inside of the coolant tank 703. One end of the water pipe interface 702 located at the bottom of the core fixing plate 403 is connected to the output end of the coolant chamber 701. The other end of the water pipe interface 702 located at the bottom of the core fixing plate 403 is connected to one end of the supply pipe 706 through a pipe. One end of the water pipe interface 702 located at the top of the core fixing plate 403 is connected to the output port of the coolant chamber 701. The other end of the water pipe interface 702 located at the top of the core fixing plate 403 is connected to the inside of the coolant tank 703 through a pipe.

[0029] The coolant chamber 701 is spirally or serpentinely distributed along the sidewall of the mold core 404, which can evenly cover the heat-generating area of ​​the mold core 404, especially the ends and thin-walled parts of the mold core 404, ensuring no dead corners in cooling; the liquid pump 704 is a miniature centrifugal type with a suction pressure of 0.3-0.5MPa, which can drive the coolant to circulate stably in the circuit, and the flow rate is controlled at 5-15L / min to avoid insufficient cooling due to too low a flow rate or energy waste due to too high a flow rate; the core fixing plate 403 has two water... The pipe interfaces 702 correspond to the inlet and outlet of the coolant: the bottom water pipe interface 702 is the inlet end, which is connected to the output end of the liquid pump 704 through the supply pipe 706 to send the low-temperature coolant into the coolant chamber 701; the top water pipe interface 702 is the outlet end, which sends the coolant that has absorbed heat back to the coolant tank 703 through the pipe to form a closed loop circulation; a temperature control module, such as a heating pipe or a cooling fan, can be added to the coolant tank 703 to stabilize the coolant temperature at 20-30℃ and avoid the decrease in cooling efficiency caused by excessively high coolant temperature.

[0030] This embodiment achieves a dual cooling system by constructing internal cooling of the mold cavity core 404 and external cooling of the moving mold 2 and fixed mold 3. This solves the problems of excessively high internal temperature of the mold cavity core 404 and uneven cooling of the plastic part caused by relying solely on external cooling. By circulating the coolant in the coolant chamber 701 inside the mold cavity core 404, the temperature reduction efficiency of the mold cavity core 404 can be improved, the cooling time of the plastic part can be shortened, and the production efficiency can be greatly improved. At the same time, the uniform cooling effect can reduce defects such as shrinkage marks and warping caused by internal and external temperature differences in the plastic part, reduce planar errors, and meet the quality requirements of high-precision plastic parts. It is especially suitable for molding cooling-sensitive plastic materials such as PC and ABS.

[0031] Optionally, the coolant can be deionized water, a 5%-10% concentration of ethylene glycol aqueous solution, or a special mold coolant. Deionized water is suitable for production at room temperature, while ethylene glycol aqueous solution can be used in environments ranging from -10℃ to 40℃ to avoid freezing or corrosion. In addition, a flow sensor can be added to the return pipe to monitor the coolant circulation status in real time, making it easier to detect pipe blockages and other faults in a timely manner.

[0032] The ejector pin ejection guide mechanism is located between the mold frame 1 and the moving mold 2. The ejector pin ejection guide mechanism is provided with an ejection hopper 607. During ejection, the material falls into the inner side of the ejection hopper 607 for ejection guidance. In some embodiments, see Figure 3 , Figure 5 , Figure 6The ejection guide mechanism also includes several support slide rods 601, a push rod fixing plate 602, an ejection push rod 603, a second hydraulic cylinder 604, a second return spring 605, a fixing ear 606, and several ejection rollers 608. One end of each support slide rod 601 is fixedly installed on one side of the moving mold 2. The push rod fixing plate 602 is slidably connected to the outer wall of the support slide rods 601. One end of the ejection push rod 603 is fixedly installed on one side of the push rod fixing plate 602. The second hydraulic cylinder 604 is fixedly installed on one side of the mold frame 1. The second return spring 605 is sleeved on the outer wall of the support slide rod 601. The fixing ear 606 is fixedly installed on the top... On one side of the rod fixing plate 602, several ejector rollers 608 are rotatably connected to the inside of the ejector hopper 607. One side of the ejector hopper 607 is fixedly connected to one end of the fixing ear 606. The ejector hopper 607 is located at the bottom of the moving mold 2. One end of the ejector rod 603 is fixedly installed in the middle of the ejector rod fixing plate 602. One end of the second return spring 605 abuts against one side of the ejector rod fixing plate 602, and the other end of the second return spring 605 abuts against one side of the moving mold 2. Several ejector rollers 608 are evenly distributed inside the ejector hopper 607. One end of the ejector rod 603 is slidably connected inside the moving mold 2, and one end of the ejector rod 603 is located inside the moving mold 2.

[0033] Among them, the support slide rod 601 adopts a cylindrical optical axis, symmetrically distributed on one side of the ejector pin fixing plate 602, and its surface is treated with high precision chrome plating, which can reduce the frictional resistance when the ejector pin fixing plate 602 slides, and ensure the axial movement accuracy of the ejector pin 603; the second return spring 605 is sleeved on the outside of the support slide rod 601, and its two ends are respectively in contact with the end faces of the ejector pin fixing plate 602 and the moving mold 2. After the ejection is completed, it can drive the ejector pin fixing plate 602 to automatically return, without the need for additional drive components, simplifying the structure and reducing energy consumption; the ejection hopper 607 adopts The stainless steel sheet is bent and formed, with an inner wall inclination angle of 30°-45°, which facilitates the sliding of the plastic part along the inclined surface. The ejector roller 608 is made of nylon or polytetrafluoroethylene, with a smooth surface and a certain degree of elasticity, which can reduce friction and scratches when the plastic part slides down. At the same time, the spacing of the ejector roller 608 is 20-30mm, which ensures that the plastic part is stably supported and does not get stuck. The fixing ear 606 is connected to the ejector pin fixing plate 602 by welding or bolting, and can move synchronously with the ejector pin fixing plate 602 to ensure that the ejector hopper 607 is always in the optimal receiving position at the bottom of the moving mold 2.

[0034] This embodiment achieves automated and damage-free ejection of plastic parts through an ejector rod 603 ejecting the part, a ejector hopper 607 receiving it, and an ejector roller 608 guiding it. The ejector rod 603 precisely ejects the plastic part along the support slide rod 601, avoiding damage caused by the offset of traditional ejector rods. The inclined design of the ejector hopper 607 and the rolling guidance of the ejector roller 608 allow the plastic part to slide smoothly into the subsequent conveying device after it is removed from the mold, eliminating the need for manual removal and improving the automation level of the production line. At the same time, the elastic material of the ejector roller 608 effectively reduces the surface scratch rate of the plastic part, ensuring the appearance quality of the plastic part.

[0035] Optionally, a photoelectric sensor can be added to the outlet end of the unloading hopper 607 to detect whether the plastic parts slide down smoothly, preventing malfunctions caused by the accumulation of plastic parts.

[0036] Furthermore, please refer again to the figure, an injection mold includes the push-pull slide rail type automatic core-pulling demolding mechanism of any of the above embodiments.

[0037] The working process and principle of this invention: The injection molding machine drives the moving mold 2 to move towards the fixed mold 3 and close the mold until the moving mold 2 and the fixed mold 3 are tightly fitted together, forming a closed injection cavity. At the same time, the first hydraulic cylinder 402 is activated, pushing the first fixed plate 405 and the push-pull rod 406 forward. The push-pull rod 406 drives the conical block 411 to push the snap-fit ​​core 409, so that the snap-fit ​​core 409 extends out of the outer wall of the mold cavity core 404 along the snap-fit ​​groove 408 until the end of the snap-fit ​​core 409 fits against the inner wall of the injection cavity, forming a molding structure for the plastic part snap-fit. The top block 407 moves forward synchronously with the push-pull rod 406 and fits against the groove inside the mold cavity core 404, sealing the internal space of the mold cavity core 404. The core-pulling slider 502 at the bottom of the core module 4 and the two sides of the mold frame 1... The core-pulling slide rail 501 maintains its initial mating position, ensuring stable positioning of the core module 4. The injection molding machine injects molten plastic into the closed cavity through the gate until the cavity is filled, completing the injection molding. After injection molding, the core auxiliary cooling component is activated: the liquid pump 704 draws low-temperature coolant from the coolant tank 703 through the suction pipe 705, and delivers it to the water pipe interface 702 at the bottom of the core fixing plate 403 via the supply pipe 706. The coolant then enters the coolant cavity 701 on the side wall of the mold cavity core 404. The coolant then flows along a spiral / serpentine path within the coolant cavity 701, absorbing heat from the mold cavity core 404 and the molten plastic. After the temperature rises, the coolant flows out from the water pipe interface 702 at the top of the core fixing plate 403 and returns to the coolant tank 703 through the return pipe, completing the circulating cooling process. However, simultaneously, the external cooling systems of the moving mold 2 and the fixed mold 3 work synchronously, providing auxiliary cooling from the outside of the cavity to achieve dual cooling of the plastic part inside and out until the plastic part is completely solidified. After the plastic part is solidified, the first hydraulic cylinder 402 starts in reverse, pulling the first fixed plate 405 and the push-pull rod 406 to reset backward. The conical block 411 moves backward with the push-pull rod 406, and the pushing force on the snap-fit ​​core 409 disappears. Under the elastic force of the first reset spring 410, the snap-fit ​​core 409 retracts into the mold cavity core 404 along the snap-fit ​​groove 408, disengaging from the snap-fit ​​groove of the plastic part, completing the core pulling of the snap-fit ​​core 409. Simultaneously, the core module 4 moves backward as a whole under the pull of the first hydraulic cylinder 402, and the core pulling slider 502 at its bottom moves along the core pulling slide rails 50 on both sides of the mold frame 1. 1. Smooth Sliding: During the sliding process, the lubricating oil in the oil reservoir 506 is continuously replenished to the oil cavity 503 of the core-pulling slide rail 501 through the oil pipe 505. The roller 504 rotates under the drive of the core-pulling slider 502, picks up the lubricating oil in the oil cavity 503 and applies it to the mating surface to reduce sliding friction until the mold core 404 is completely pulled out from the solidified plastic part. The core-pulling stage ends. After the core-pulling is completed, the injection molding machine drives the moving mold 2 to separate from the fixed mold 3. The plastic part moves with the moving mold 2 to the ejection position. The second hydraulic cylinder 604 is activated, pushing the ejector pin fixing plate 602 to slide forward along the support slide rod 601. The ejector pin fixing plate 602 drives the ejection ejector pin 603 to move forward synchronously. The end of the ejection ejector pin 603 passes through the reserved hole of the moving mold 2 and pushes the bottom of the plastic part.The plastic part is ejected from the cavity of the moving mold 2. The ejected part falls into the ejector hopper 607 at the bottom of the moving mold 2 and slides along the inclined inner wall of the ejector hopper 607. The ejector roller 608 inside the ejector hopper 607 rotates as the part slides, reducing friction and guiding the part smoothly to the subsequent conveying device. After ejection, the second hydraulic cylinder 604 reverses and resets. The ejector pin fixing plate 602 retracts along the support slide rod 601 under the elastic force of the second reset spring 605. The ejector pin 603 retracts into the moving mold 2, and the ejector hopper 607 resets synchronously with the fixing lug 606, awaiting the next work cycle.

[0038] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0039] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A push-pull slide rail type automatic core-pulling and demolding mechanism, characterized in that, The mold includes a mold frame (1), a moving mold (2) is fixedly installed on one side of the mold frame (1), a fixed mold (3) is provided on one side of the moving mold (2), a core module (4) is provided between the moving mold (2) and the fixed mold (3), and a push-pull slide rail mechanism, a push rod ejection guide mechanism and a core auxiliary cooling assembly are provided between the mold frame (1) and the core module (4); The push-pull slide rail mechanism is located on one side of the mold frame (1). The push-pull slide rail mechanism includes several core-pulling slide rails (501) and several core-pulling sliders (502). The core-pulling sliders (502) installed on the core module (4) slide on the core-pulling slide rails (501) to provide precise guidance during core pulling. The ejector pin ejection guide mechanism is located between the mold frame (1) and the moving mold (2). The ejector pin ejection guide mechanism is provided with an ejection hopper (607). When ejecting material, the material falls into the inside of the ejection hopper (607) for ejection guidance. The core auxiliary cooling component is disposed between the mold frame (1) and the core module (4). The core auxiliary cooling component opens a coolant cavity (701) in the core of the core module (4). The coolant is cooled from the inside through the coolant cavity (701), which assists the cooling system of the moving mold (2) and the fixed mold (3) in forming the workpiece.

2. The push-pull slide rail type automatic core-pulling and demolding mechanism according to claim 1, characterized in that: The push-pull slide rail mechanism also includes an oil cavity (503), several rollers (504), an oil pipe (505), and an oil storage bottle (506). The oil cavity (503) is located inside the core-pulling slide rail (501). Several rollers (504) are rotatably connected to the top of the core-pulling slide rail (501). The oil pipe (505) is fixedly installed at one end of the core-pulling slide rail (501). The oil storage bottle (506) is fixedly installed at one end of the oil pipe (505). Two core-pulling slide rails (501) are fixedly installed on both sides of the mold frame (1). The core-pulling slider (502) is slidably connected to the outside of the core-pulling slide rail (501).

3. The push-pull slide rail type automatic core-pulling and demolding mechanism according to claim 2, characterized in that: Several rollers (504) are arranged linearly on the top of the core-pulling slide rail (501). The bottom of the rollers (504) is located inside the oil cavity (503), and the upper surface of the rollers (504) is located inside the core-pulling slider (502). One end of the oil pipe (505) is connected to the inside of the oil cavity (503), and the other end of the oil pipe (505) is connected to the inside of the oil storage bottle (506). One end of the oil storage bottle (506) is provided with an air hole.

4. The push-pull slide rail type automatic core-pulling and demolding mechanism according to claim 1, characterized in that: The core module (4) includes a mounting bracket (401), a first hydraulic cylinder (402), a core fixing plate (403), a mold cavity core (404), a first fixing plate (405), a push-pull rod (406), a top block (407), a snap-fit ​​groove (408), a snap-fit ​​core (409), a first return spring (410), and a conical block (411). The mounting bracket (401) is fixedly mounted on the top of the mold frame (1), the first hydraulic cylinder (402) is fixedly mounted on one side of the mounting bracket (401), the core fixing plate (403) is located at one end of the first hydraulic cylinder (402), and the mold cavity core (404) is fixed. The first fixing plate (405) is fixedly installed on one side of the core fixing plate (403), the first fixing plate (405) is fixedly installed on one end of the first hydraulic cylinder (402), one end of the push-pull rod (406) is fixedly installed on one side of the first fixing plate (405), the top block (407) is fixedly installed on one end of the push-pull rod (406), the snap-fit ​​groove (408) is opened on the upper and lower sides of the mold cavity core (404), one end of the snap-fit ​​core (409) is slidably connected to the inner side of the snap-fit ​​groove (408), the first reset spring (410) is sleeved on the outer wall of the snap-fit ​​core (409), and the conical block (411) is fixedly connected to one end of the push-pull rod (406).

5. The push-pull slide rail type automatic core-pulling and demolding mechanism according to claim 4, characterized in that: One end of the mold cavity core (404) is slidably connected between the moving mold (2) and the fixed mold (3). One end of the push-pull rod (406) passes through the core fixing plate (403) and is slidably connected inside the mold cavity core (404). One end of the top block (407) abuts against one end of the mold cavity core (404) during injection molding. One end of the first reset spring (410) abuts against the inner surface of the mold cavity core (404). The other end of the first reset spring (410) abuts against the inner side of one end of the snap-fit ​​core (409). The conical block (411) is located between the two snap-fit ​​cores (409), and the outer surface of the conical block (411) abuts against one end of the snap-fit ​​core (409).

6. The push-pull slide rail type automatic core-pulling and demolding mechanism according to claim 1, characterized in that: The core auxiliary cooling assembly also includes several water pipe interfaces (702), a coolant tank (703), a liquid pump (704), a suction pipe (705), and a supply pipe (706). Several of the water pipe interfaces (702) are respectively installed on the top and bottom of the core fixing plate (403). The coolant tank (703) is fixedly installed on one side of the mold frame (1). The liquid pump (704) is fixedly installed on one side of the mold frame (1). The suction pipe (705) is fixedly installed at one end of the supply pipe (706) at the suction end and the output end of the liquid pump (704). The coolant cavity (701) is opened inside the side wall of the mold core (404). The other end of the suction pipe (705) is connected to the inside of the coolant tank (703).

7. The push-pull slide rail type automatic core-pulling and demolding mechanism according to claim 6, characterized in that: One end of the water pipe interface (702) located at the bottom of the core fixing plate (403) is connected to the output end of the coolant chamber (701), and the other end of the water pipe interface (702) located at the bottom of the core fixing plate (403) is connected to one end of the liquid supply pipe (706) through a pipe. One end of the water pipe interface (702) located at the top of the core fixing plate (403) is connected to the output port of the coolant chamber (701), and the other end of the water pipe interface (702) located at the top of the core fixing plate (403) is connected to the inside of the coolant tank (703) through a pipe.

8. The push-pull slide rail type automatic core-pulling and demolding mechanism according to claim 1, characterized in that: The ejection guide mechanism also includes several support slides (601), a push rod fixing plate (602), an ejection push rod (603), a second hydraulic cylinder (604), a second return spring (605), a fixing lug (606), and several ejection rollers (608). One end of each of the support slides (601) is fixedly installed on one side of the moving mold (2). The push rod fixing plate (602) is slidably connected to the outer wall of the support slides (601). One end of the ejection push rod (603) is fixedly installed on the push rod. On one side of the fixed plate (602), the second hydraulic cylinder (604) is fixedly installed on one side of the mold frame (1), the second reset spring (605) is sleeved on the outer wall of the support slide rod (601), the fixed ear (606) is fixedly installed on one side of the top rod fixed plate (602), and several ejector rollers (608) are rotatably connected to the inside of the ejector hopper (607). One side of the ejector hopper (607) is fixedly connected to one end of the fixed ear (606), and the ejector hopper (607) is located at the bottom of the moving mold (2).

9. The push-pull slide rail type automatic core-pulling and demolding mechanism according to claim 8, characterized in that: One end of the ejector rod (603) is fixedly installed in the middle of the ejector rod fixing plate (602). One end of the second return spring (605) abuts against one side of the ejector rod fixing plate (602), and the other end of the second return spring (605) abuts against one side of the moving mold (2). Several ejector rollers (608) are evenly distributed inside the ejector hopper (607). One end of the ejector rod (603) is slidably connected inside the moving mold (2), and one end of the ejector rod (603) is located inside the moving mold (2).

10. An injection mold, characterized in that, Includes the push-pull slide rail type automatic core-pulling and demolding mechanism as described in any one of claims 1 to 9.

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