An injection mold with auxiliary material feeding after ejection.

Abstract

This invention relates to the field of injection molding technology and discloses an injection mold with auxiliary material feeding after ejection, comprising: a mold platform with a cavity and a punch on the mold platform; a drive unit located between the mold platform and the cavity and punch for moving the cavity and punch; and multiple ejector pins on the cavity, wherein the drive unit allows the multiple ejector pins to slide within the cavity when the cavity is moved to a predetermined position. In this application, atomized release agent is first uniformly sprayed while the mold is open, and then gas pulse disturbance is used to redistribute the adhering droplets, thereby constructing a more stable and continuous release agent film layer. During the first-stage atomization spraying process, the nozzle atomizes the release agent into fine droplets under the action of high-speed gas, spraying it from top to bottom onto the surface of the mold cavity. Even in areas with deep cavities and complex curvature, coverage and consistency can still be ensured. By controlling the liquid flow rate to be constant, shallow accumulation and sagging are avoided, achieving a more stable initial film quality.

Description

Technical Field

[0001] This invention relates to the field of injection molding technology, and more specifically to an injection mold with auxiliary material feeding after ejection. Background Technology

[0002] Molds are the core equipment for the mass production of thermoplastic products. Their structure typically consists of a moving mold, a fixed mold, a gating system, a cooling system, and an ejection mechanism. During the molding cycle, plastic is injected into the mold cavity under high temperature and pressure. After cooling and solidification, the mold is opened, and the product is ejected by the ejection mechanism. To reduce demolding resistance, improve molding efficiency, and prevent the product from adhering and remaining in the mold cavity, a release agent is often sprayed onto the surface of the injection mold to facilitate smooth demolding. Traditional molds, such as flat molds, shallow box molds, and kettle molds, have relatively shallow and flat cavities, allowing for more even application of the release agent, and the demolded product easily falls naturally or is picked up by a robotic arm.

[0003] However, the structural characteristics of injection molds for products such as helmets differ significantly. Helmet mold cavities are typically deep and have complex molding surfaces, making demolding more difficult. Especially during the pre-injection mold release agent spraying stage, the deep and narrow mold cavity restricts spray penetration, resulting in uneven distribution of the release agent within the cavity. Shallow areas receive more agent, while deeper areas receive insufficient agent, leading to areas of the molded product with high adhesion and high demolding resistance, often resulting in incomplete ejection or mold sticking. Attempting to increase spray pressure or flow rate to enhance coverage can easily lead to excessive coating buildup, causing mold contamination and even affecting the product's appearance.

[0004] Therefore, in such deep-cavity and complex molds, relying solely on traditional spraying of release agents is insufficient to guarantee a stable and reliable release effect. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides an injection mold with post-ejection auxiliary material feeding, aiming to alleviate the aforementioned problems to at least some extent.

[0006] The above-mentioned technical objective of the present invention is achieved through the following technical solution:

[0007] An injection mold with post-ejection auxiliary unloading, comprising:

[0008] A mold table, wherein a cavity mold and a punch mold are provided on the mold table;

[0009] A drive unit located between the mold table and the die and punch is used to move the die and punch.

[0010] A plurality of ejector pins are provided on the die cavity, and the driving unit can allow the plurality of ejector pins to slide within the die cavity when the die cavity is moved to a predetermined position;

[0011] The conveying part, located at the top of the mold table, is situated at the bottom of the concave mold and the convex mold, and has a preset distance between them, for conveying the mold.

[0012] A spraying station is provided on the mold platform. A liquid pipe and an air pipe are connected on the spraying station. Multiple nozzles are connected to the air pipe. A connecting pipe connected to the nozzles is connected to the liquid pipe.

[0013] A spraying component located between the mold platform and the spraying platform is used to deliver release agent to the liquid pipe and gas to the gas pipe.

[0014] Preferably, the conveying unit includes a conveying frame connected to the top of the mold table, the conveying frame is provided with multiple conveying shafts, a conveyor belt is commonly fitted on the multiple conveying shafts, and a motor a connected to one of the conveying shafts is connected to the conveying frame.

[0015] Preferably, the drive unit includes a frame connected to the mold table, and two hydraulic cylinders are connected to the frame. The die is connected to the drive shaft of one of the hydraulic cylinders, and the punch is connected to the drive shaft of the other hydraulic cylinder.

[0016] Preferably, a top plate is connected to one side of the cavity, the ejector pin is connected to the top plate, one end of the ejector pin extends into the mold cavity on the cavity, a spring a is connected between the top plate and the cavity, and an avoidance opening is provided on the top plate for avoiding the hydraulic cylinder.

[0017] Preferably, the spraying component includes a motor b connected to the frame, a lead screw a connected to the drive shaft of the motor b, and the spraying table is slidably connected to the frame and threadedly engaged with the lead screw a.

[0018] Preferably, the spraying component is capable of delivering release agent into the nozzle when the spraying table moves downward, and the spraying component is capable of stopping the delivery of release agent when the spraying table moves upward;

[0019] The spraying component also includes a housing connected to the bottom of the mold platform. A feed pipe is connected to the housing. A pressure plate is slidably connected inside the housing. The height of the pressure plate is higher than the connection between the feed pipe and the housing. A threaded pipe is connected to the top of the pressure plate. A lead screw a is connected to the bottom of the lead screw a. The lead screw b passes through the mold platform and the housing, extends into the interior of the housing, and is threaded into the threaded pipe. A rigid pipe is fixedly connected inside the housing. The top of the rigid pipe extends to the top of the pressure plate. The pressure plate is slidably fitted onto the rigid pipe. A flexible hose a is connected to the top of the rigid pipe. One end of the flexible hose a passes through the housing and the mold platform, extends into the frame, and communicates with the liquid pipe on the spraying platform.

[0020] Preferably, the bottom of the connecting tube is connected to a piston a, and a spring b is connected between the piston a and the connecting tube.

[0021] Preferably, the spraying component further includes an air pump connected to one side of the housing, the air pump's outlet end being connected to a hose b, one end of the hose b extending into the frame and communicating with the air pipe.

[0022] Preferably, the spraying component is capable of intermittently supplying gas to the nozzle as the spraying table moves upward;

[0023] The nozzle is equipped with an air baffle ring. A piston b is slidably connected to the bottom of the nozzle. A spring c is connected between the piston b and the nozzle. A rotating shaft is rotatably connected inside the spraying station. A three-axis convex arm is connected to the rotating shaft. A boss extending to one side of the three-axis convex arm is connected to one end of the piston b. A connecting groove is opened on the spraying station. A gear is rotatably connected in the connecting groove. The rotating shaft extends into the connecting groove and connects with the gear. A rack that meshes with the gear is connected to the frame.

[0024] Preferably, the bottom of the piston a is rotatably connected to a connecting rod a, the bottom of the connecting rod a is connected to a connecting rod b, one end of the connecting rod b is connected to the air baffle ring, the air baffle ring is slidably connected inside the nozzle, and a spring d is connected between the air baffle ring and the nozzle.

[0025] In summary, the present invention has the following main beneficial effects:

[0026] This application first achieves uniform spraying of the atomized release agent while the mold is open, then utilizes gas pulse disturbance to redistribute the adhering droplets, thereby constructing a more stable and continuous release agent film. During the first-stage atomization spraying process, the nozzle atomizes the release agent into fine droplets under the action of high-speed gas, spraying it from top to bottom onto the surface of the mold cavity. Even in deep areas with complex curvature, coverage and consistency are ensured. By controlling the liquid flow rate to a constant level, shallow accumulation and sagging are avoided, achieving a more stable initial film quality.

[0027] In the second stage, the spraying system shuts off the liquid channels, maintaining only a pulsed airflow output. This intermittently disturbs the droplet film that had already adhered to the mold cavity surface in the first stage. The periodic thrust of the airflow causes the droplets to move slightly or redistribute along the mold contour, especially pushing droplets that have accumulated in shallow areas to flow deeper into the mold cavity, compensating for insufficient coating in structural blind spots. Furthermore, the pulsed state avoids premature drying caused by continuous airflow, facilitating natural droplet spreading and slow film formation, thereby improving overall film uniformity and surface adhesion integrity.

[0028] After the spraying is completed, the mold is closed for injection molding. The molten plastic enters the mold cavity through the injection channel on the punch and quickly solidifies under the cooling effect of the heat exchange channel inside the mold. Then the mold is opened, and the ejector pin ejects the product. With the help of the release agent, the product is smoothly demolded without tearing or sticking. The product is then smoothly transferred to the next process by the conveyor unit set below the mold, realizing automated material unloading. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0030] Figure 2 This is a cross-sectional schematic diagram of the overall structure of the present invention;

[0031] Figure 3 This is another cross-sectional view of the overall structure of the present invention;

[0032] Figure 4 This is a schematic diagram of the punch and die structure of the present invention;

[0033] Figure 5 This is a schematic diagram of the structure of hose a and hose b of the present invention;

[0034] Figure 6 This is a cross-sectional schematic diagram of the spray booth structure of the present invention;

[0035] Figure 7 yes Figure 3 A magnified view of the local structure at point a;

[0036] Figure 8This is a cross-sectional schematic diagram of the nozzle structure of the present invention.

[0037] Figure label:

[0038] 100. Mold table; 101. Die; 102. Punch; 103. Drive unit; 104. Ejector pin; 105. Conveyor unit; 106. Spraying table; 107. Liquid pipe; 108. Air pipe; 109. Spray nozzle; 110. Connecting pipe;

[0039] 200. Conveyor frame; 201. Conveyor shaft; 202. Conveyor belt; 203. Motor a; 204. Frame; 205. Hydraulic cylinder; 206. Top plate; 207. Spring a; 208. Clearance opening;

[0040] 300. Motor b; 301. Lead screw a; 302. Housing; 303. Feed pipe; 304. Pressure plate; 305. Threaded pipe; 306. Lead screw b; 307. Rigid pipe; 308. Flexible hose a; 309. Piston a; 310. Spring b; 311. Air pump; 312. Flexible hose b;

[0041] 400. Air baffle ring; 401. Piston b; 402. Spring c; 403. Shaft; 404. Three-axis convex arm; 405. Boss; 406. Connecting groove; 407. Gear; 408. Rack; 409. Connecting rod a; 410. Connecting rod b; 411. Spring d. Detailed Implementation

[0042] 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.

[0043] refer to Figures 1-8 This embodiment provides an injection mold for auxiliary material feeding after ejection, including a mold table 100, a cavity mold 101 and a punch mold 102, a drive unit 103, an ejector pin 104, a conveyor unit 105, a spraying table 106, a spraying component and multiple nozzles 109.

[0044] Reference Figure 2As shown, the mold platform 100 serves as the structural foundation platform for mounting the die 101 and the punch 102, which cooperate to form an injection mold cavity. The punch 102 has an injection channel. The drive unit 103 is located between the mold platform 100 and the mold, and functions to drive the die 101 and the punch 102 to move relative to each other in the left-right direction, thus opening and closing the mold. During mold opening, the drive unit 103 can also drive multiple ejector pins 104 located within the die 101 to slide along the mold cavity direction, thereby ejecting the injection-molded product and facilitating smooth demolding.

[0045] like Figure 1 as well as Figure 2 As shown, the conveying unit 105 is located at the lower part of the mold table 100, below the closed area of ​​the die 101 and the punch 102, and maintains a preset distance from the mold. It is used to receive the ejected model after demolding and convey it to the next station.

[0046] A spraying station 106 is mounted on a mold platform 100, and has an air pipe 108 and a liquid pipe 107. Multiple nozzles 109 are mounted on the spraying station 106 and are each connected to a connecting pipe 110. The connecting pipe 110 is connected to the liquid pipe 107 and is used to supply liquid to the nozzle 109; at the same time, the nozzle 109 is connected to the air pipe 108.

[0047] A spraying component is provided between the mold table 100 and the spraying table 106. The spraying component is used to deliver release agent to the liquid pipe 107 and gas to the gas pipe 108. There is a motion relationship between the spraying component and the spraying table 106, and its liquid and gas supply status can be automatically adjusted according to the movement direction of the spraying table 106.

[0048] In the first stage, when the spraying station 106 is descending, the spraying component begins to supply liquid to the liquid pipe 107 and simultaneously supplies air to the air pipe 108.

[0049] In the second stage, the spraying station 106 moves back from bottom to top. As the spraying station 106 moves upward to the set height, the spraying component automatically stops supplying liquid to the liquid pipe 107. At the same time, the spraying component switches the air supply mode to the air pipe 108, from continuous air supply to intermittent air supply, that is, it sprays high-speed airflow to the nozzle 109 in a pulse form according to the set rhythm.

[0050] With the above setup, before injection molding, the mold is first opened by the drive unit 103, and the cavity mold 101 and the punch mold 102 separate in the left-right direction. Then, the spraying station 106 moves towards the mold, and the spraying components begin to work, continuously supplying release agent to the liquid pipe 107 while simultaneously introducing high-speed gas into the air pipe 108. After the liquid and gas converge inside the nozzle 109, the release agent is atomized under the action of the high-speed airflow, forming a fine spray that is evenly sprayed onto the cavity surface of the cavity mold 101. The spraying process proceeds from top to bottom, ensuring effective coverage even in areas with deep cavities and complex geometries. The liquid flow rate of the release agent remains constant, effectively preventing liquid accumulation or dripping in shallow cavity areas due to excessive spraying, thereby forming a uniform and continuous release film layer throughout the entire cavity.

[0051] After the first coat of paint is applied, the spray booth 106 retracts in the opposite direction. During this process, the spraying components automatically shut off the liquid supply, and the flow path of the liquid pipe 107 is cut off to prevent the nozzle 109 from continuing to receive the release agent. Simultaneously, the air supply from the air pipe 108 does not stop but enters a pulse control phase, periodically delivering gas to the nozzle 109 at a set rhythm. This process involves a pulse-jet airflow pattern, characterized by short bursts of high-pressure spray, intervals, and further spraying, creating a rhythmic, intermittent, turbulent airflow.

[0052] The pulsed jet no longer sprays new release agent, but instead acts on the pre-adhered droplet film on the mold surface. Since the droplets formed in the first coat are still in a semi-fluid state with low interfacial tension, they are easily deformed by airflow disturbances. Driven by the pulsed airflow, droplets adhering to the shallow areas or curved edges of the mold cavity are redistributed, with some being pushed to the bottom or deep, hard-to-reach blind areas of the mold cavity, forming a "secondary coating" of the liquid. This action optimizes the film thickness distribution without changing the total amount of release agent, making it more consistent across the shallow and deep structures, avoiding uneven distribution with shallow accumulation and deep sparseness.

[0053] Furthermore, the shearing effect of the intermittent airflow also promotes the spread and expansion of locally attached droplets, increasing their contact area with the mold cavity surface and improving the film quality of the release agent. At the same time, since the spraying station 106 maintains stable movement during this process, the entire mold cavity surface can be subjected to air pressure in sequence under the airflow disturbance, thereby completing the dynamic optimization process of "reflow, redistribution, and reattachment" of the release agent for the complex structure of deep cavities.

[0054] Compared to traditional spraying methods, the disturbance effect of this application causes the atomized droplets already adhering to the shallow part of the mold to undergo slight displacement and deformation, achieving redistribution flow along the mold cavity contour under the dominance of surface tension. Especially in deep cavity molds such as helmets, some structures have obstructions or curved indentations, making it difficult for conventional spraying to allow the release agent to penetrate effectively. However, this type of airflow pulse forms a "layer-by-layer pushing wave" effect, which can push the droplets into the depth of the mold and blind corner areas, making up for the areas not completely covered by the first spray, thereby improving the overall uniformity of film formation.

[0055] Meanwhile, intermittent air supply effectively reduces the total heat and shear of the airflow per unit time, suppressing the risk of droplets drying and forming a shell at the moment of adhesion, and helping droplets form a continuous, unbroken, uniform film layer on the mold cavity surface. This method is particularly suitable for deep cavity injection molds for helmets, and can significantly improve film uniformity, film quality, and spraying reliability of deep cavity structures without increasing the amount of release agent used.

[0056] After spraying, the spraying station 106 returns to its original position, the mold begins to close, and the drive unit 103 drives the cavity mold 101 and the punch mold 102 to move closer together in the left and right direction, forming a closed mold cavity structure. Molten plastic is injected into the mold cavity through the injection channel on the punch mold 102, filling and completing the injection molding. After injection molding, the heat exchange channel inside the mold starts to work, and the coolant (usually circulating water) flows in the channels inside the cavity mold 101 and the punch mold 102, carrying away the heat between the mold cavity wall and the injection material, prompting the injection molded product to complete heat exchange and shaping in a short time, ensuring its dimensional stability and molding quality.

[0057] After cooling, the mold opens, the cavity 101 moves to one side, and multiple ejector pins 104 inside the mold simultaneously push out, ejecting the formed product from the mold cavity. Under the action of the release agent film, the product can smoothly detach from the mold wall, effectively avoiding problems such as sticking, tearing, and surface stringing, ensuring product integrity and appearance quality. The ejected product falls naturally into the conveyor section 105 located at the bottom of the mold table 100. The conveyor section 105 maintains a preset distance from the mold, capable of receiving the product and transporting it to subsequent processing stations, completing automated unloading.

[0058] In this application, the secondary treatment stage, combined with the first atomized spraying, constitutes a two-stage mold release agent film-forming system, which significantly improves the uniformity of the spraying coverage on the mold cavity surface and minimizes quality risks such as sticking, ejection failure, and finished product defects caused by uneven spraying. It is especially suitable for the high-quality production requirements of deep cavity injection molding structures such as helmets.

[0059] In this embodiment, the conveying unit 105 includes a conveying frame 200 connected to the top of the mold table 100. The conveying frame 200 is laterally arranged in the area below the concave mold 101 and the convex mold 102, and is fixed to the mold table 100 by a support structure. The conveying frame 200 has multiple conveying shafts 201 arranged parallel to each other along the conveying direction, and a ring-shaped conveyor belt 202 is sleeved between the multiple conveying shafts 201. The conveyor belt 202 is made of a flexible, heat-resistant material with a certain degree of elasticity, which can adapt to the high-temperature initial contact of the injection-molded product. One end of the conveying frame 200 is connected to a motor a203. The drive shaft of the motor a203 is connected to one of the conveying shafts 201, driving the conveying shaft 201 to rotate, thereby driving the entire conveyor belt 202 to circulate at a preset speed.

[0060] With the above setup, after injection molding is completed and cooled to set, the drive unit 103 controls the cavity mold 101 and the punch mold 102 to separate in the left-right direction, the mold opens, and at the same time, multiple ejector pins 104 located inside the cavity mold 101 are activated, ejecting the molded plastic product. After the ejection action is completed, the product falls naturally under the action of gravity. Since the conveyor belt 202 maintains a reasonable distance from the bottom of the mold cavity, the product can fall directly onto the surface of the conveyor belt 202. At this time, the motor a203 drives the conveyor shaft 201 to rotate, driving the conveyor belt 202 to run, and the product is then smoothly transported to the receiving position outside the mold or the subsequent processing station.

[0061] Since the conveyor belt 202 has a continuous circulation structure, it can match the forming cycle with the conveying rhythm, which not only avoids the delay and instability caused by manual intervention, but also greatly improves the automation level of the unloading process.

[0062] In this embodiment, the drive unit 103 includes a frame 204 connected to the mold table 100. The frame 204 is a welded steel structure and is fixedly installed above the mold table 100 to provide structural support and a drive mounting base for the opening and closing of the mold. Two hydraulic cylinders 205 are symmetrically installed on the frame 204. The two cylinders 205 are respectively fixed on both sides of the frame 204, and their drive shafts are respectively connected to the die 101 and the punch 102. The drive shaft of one cylinder 205 is connected to the die 101, and the drive shaft of the other cylinder 205 is connected to the punch 102.

[0063] With the above settings, at the start of injection molding, the two hydraulic cylinders 205 drive shafts move simultaneously, causing the die 101 and the punch 102 to move laterally in opposite directions, realizing the mold opening and closing state, and providing working space for subsequent spraying and injection molding operations.

[0064] After the mold opens, the spraying station 106 moves above the concave mold 101 to perform atomized spraying and completes secondary pulse airflow disturbance, effectively forming a uniform and continuous mold release agent film. After spraying, the two hydraulic cylinders 205 drive the shafts to move, causing the concave mold 101 and the convex mold 102 to move synchronously towards the center, achieving high-precision mold closure. After injection molding and cooling, the mold opens again through the reverse movement of the two hydraulic cylinders 205, and the demolding action is completed in conjunction with the internal ejector pin 104 structure. This dual hydraulic cylinder 205 drive structure not only completes the mold opening and closing cycle in a shorter time, improving molding cycle efficiency, but also ensures stable output direction.

[0065] In this embodiment, a top plate 206 is connected to one side of the die cavity 101. The top plate 206 is a flat metal plate located on the outside of the die cavity 101 and extends along the length of the die cavity 101. Multiple ejector pins 104 are arranged and fixedly connected to the top plate 206, with one end extending into the mold cavity of the die cavity 101. To achieve elastic reset, a spring a207 is provided between the top plate 206 and the die cavity 101. Multiple springs a207 are distributed to automatically spring back the top plate 206 after ejection.

[0066] Furthermore, to prevent interference between the top plate 206 structure and the mold drive unit 103, the top plate 206 is provided with a clearance opening 208 to allow passage for the hydraulic cylinder 205 structure used for mold drive. The clearance opening 208 is located in the middle of the top plate 206, corresponding to the installation position of the hydraulic cylinder 205, and its shape matches the contour of the hydraulic cylinder 205 to avoid structural conflicts during mold movement.

[0067] Reference Figure 4 As shown, with the above settings, after the mold injection and cooling are completed, the drive unit 103 controls the cavity mold 101 and the punch mold 102 to separate in the left and right direction, and the mold opens. As the cavity mold 101 moves to the open position, the top plate 206 located on the outside of the cavity mold 101 contacts the frame 204 under the action of the hydraulic cylinder 205. The multiple ejector pins 104 on it can move relative to the cavity mold 101, and their front ends enter the mold cavity to eject the shaped plastic product from the mold cavity.

[0068] During the ejection process, the ejector pin 104 directly acts on the back of the product in conjunction with the uniformly distributed mold release agent film in the mold cavity, which can effectively reduce ejection resistance and prevent the product from getting stuck, broken, or having surface stringing. After being ejected, the product falls naturally onto the conveyor belt 202 below the mold, completing the unloading process.

[0069] As the ejection action ends, during the next mold closing, the ejector plate 206 automatically resets under the elastic force of the spring a207, causing the ejector pin 104 to retract to the outside of the cavity mold 101 and return to the standby state.

[0070] The avoidance opening 208 ensures that the top plate 206 will not interfere with the hydraulic cylinder 205 during the entire ejection or reset stroke, thus guaranteeing safe, continuous and reliable structural operation.

[0071] In this embodiment, the spraying component includes a motor b300 mounted on the frame 204. The motor b300 is fixedly installed on the upper end of the frame 204, and its output shaft is connected to a lead screw a301. The spraying table 106 is slidably connected to the guide rail structure in the middle of the frame 204 and is connected to the lead screw a301 through a threaded structure. That is, when the motor b300 drives the lead screw a301 to rotate, the lead screw pitch and the nut push relationship drive the spraying table 106 to reciprocate linearly in the left-right direction on the frame 204.

[0072] With the above setup, before the injection molding cycle begins, motor b300 is started. Motor b300 drives lead screw a301 to rotate. Relying on the threaded transmission relationship between the lead screw and the spraying station 106, the spraying station 106 is driven to slowly slide towards the mold along the guide rail of frame 204. This transmission structure allows the spraying stroke of the nozzle 109 to have a controllable rhythm and repeatability, and no vibration or impact is generated during the entire movement of the spraying station 106, which helps to ensure the consistency of airflow direction and the stability of the spraying process.

[0073] In this embodiment, the spraying component further includes a housing 302 disposed at the bottom of the mold platform 100. The housing 302 is used to contain liquid release agent and achieve stable liquid supply. A feed pipe 303 is connected to the housing 302 for injecting release agent into the housing 302. A pressure plate 304 is provided inside the housing 302. The pressure plate 304 can slide vertically inside the housing 302, and its top height is higher than the connection between the feed pipe 303 and the housing 302.

[0074] A threaded tube 305 is fixedly connected to the top of the pressure plate 304 for engagement with the lead screw structure below. The lead screw a301 is mounted on the frame 204 and drives the spraying table 106 to move horizontally; its bottom end is connected to a longitudinally extending lead screw b306. The lead screw b306 passes through the mold table 100 and the housing 302 and extends into the housing 302. Its lower threaded section engages with the threaded tube 305 at the top of the pressure plate 304, forming a vertical pushing structure. The protruding section of the lead screw b306 is a smooth shaft section.

[0075] A rigid tube 307 is fixed inside the housing 302. The top of the rigid tube 307 extends above the pressure plate 304, and the pressure plate 304 is fitted onto the outer wall of the rigid tube 307 via a sliding sleeve, allowing it to maintain its position and guidance during vertical movement. A flexible tube a308 is connected to the top of the rigid tube 307. One end of the flexible tube a308 passes through the housing 302 and the mold table 100, extends into the frame 204, and connects with the liquid pipe 107 on the spraying table 106, forming a liquid supply path for the release agent.

[0076] With the above setup, during spraying, motor b300 drives lead screw a301 to rotate. Since the spraying table 106 is threadedly engaged with lead screw a301, the spraying table 106 slides along the guide rail of frame 204 towards the mold under rotational drive, thus achieving downward movement of the spraying table 106. Simultaneously, the bottom end of lead screw a301 is connected to a vertically arranged lead screw b306, and the rotation of lead screw a301 drives lead screw b306 to rotate synchronously.

[0077] Since the lower end of the lead screw b306 is threadedly connected to the threaded tube 305 at the top of the pressure plate 304, its rotation will further drive the pressure plate 304 to move downward in the vertical direction.

[0078] As the pressure plate 304 descends, it gradually covers the liquid channel above the inlet and isolates the inlet pipe 303 from the cavity, forming a closed structure. At this time, the pressure plate 304 continues to compress the cavity space downwards, the gas volume inside the cavity decreases proportionally, and the internal air pressure gradually rises, forming a uniform pressure on the liquid. Under this stable air pressure, the release agent liquid at the bottom of the housing 302 is continuously and stably forced into the rigid pipe 307 fixed inside the housing 302. The motor b300 always operates at a constant speed, thus keeping the downward movement speed of the pressure plate 304 constant, making the change in cavity air pressure controllable. The liquid remains in a near-constant pressure driving state throughout the entire supply process. This ensures that during the downward movement of the spraying station 106, the release agent is continuously injected into the nozzle 109 at a constant flow rate, ensuring atomization uniformity and liquid supply stability during the spraying process, and effectively improving the coating consistency of the mold cavity surface.

[0079] In this embodiment, the bottom of the connecting pipe 110 is connected to a piston a309. The piston a309 is disposed in the liquid inlet section of the connecting pipe 110 and can slide vertically within the connecting pipe 110. A spring b310 is connected between the piston a309 and the connecting pipe 110. The spring b310 is used to apply a return force to the piston a309, so that the piston a309 maintains a preset initial position when not subjected to hydraulic pressure.

[0080] With the above setup, under the push of the pressure plate 304, the release agent liquid in the housing 302 flows into the liquid pipe 107 through the rigid pipe 307 and the flexible hose a308, and finally into the connecting pipe 110. When the liquid enters the bottom of the connecting pipe 110, the piston a309 will compress the spring b310 by a short distance due to the liquid thrust, opening the bottom channel of the connecting pipe 110, so that the liquid can flow smoothly into the nozzle 109 for the first atomized spraying of the release agent.

[0081] After the spraying station 106 completes the first coat of paint, it moves back along the original path. The drive shaft of motor b300 rotates in the opposite direction, and the spraying station 106 and pressure plate 304 move upward. During this process, the previously compressed sealed cavity inside the housing 302 gradually returns to its original volume. The upward movement of pressure plate 304 creates a relative negative pressure within the cavity. This negative pressure is transmitted to connecting pipe 110 through the liquid path, causing the previously depressed piston a309 to quickly reset under the return force of spring b310, thereby sealing the bottom channel of connecting pipe 110 and blocking the continued output of the release agent. This action achieves the goal of automatically stopping the liquid supply and automatically closing the flow channel through mechanical linkage after the spraying station 106 retracts and the release agent is supplied.

[0082] Reference Figure 3 as well as Figure 5 As shown, in this embodiment, the spraying component also includes an air pump 311 fixedly connected to one side of the housing 302. The air outlet of the air pump 311 is connected to the air pipe 108 inside the mold frame 204 via a flexible hose b312, forming a stable air supply path. The flexible hose b312 extends flexibly to adapt to the dynamic displacement during the up-and-down movement of the spraying table 106, ensuring a continuous and uninterrupted gas supply. The air pump 311 is used to provide the required compressed air into the air pipe 108.

[0083] With the above setup, when the mold cavity of the spraying station 106 moves, the air pump 311 is activated. The air pump 311 draws in air from the external environment, pressurizes it, and continuously delivers it to the air pipe 108 inside the frame 204 through the hose b312. The air pipe 108 connects to multiple nozzles 109. When the first spraying begins, the constant pressure airflow output by the air pump 311 enters the nozzle 109 and mixes with the release agent liquid from the liquid pipe 107, forming a high-speed shearing and atomization effect inside the nozzle 109, ultimately achieving the spraying of atomized release agent onto the surface of the mold cavity.

[0084] After the spraying is completed, the spraying station 106 moves back in the opposite direction, the release agent liquid passage is automatically closed, and the air pump 311 continues to supply air, which has a "redistribution" effect on the atomized droplets that have been deposited in the mold cavity. The air pump 311 and the hose b312 form a flexible and efficient air supply structure, which meets the high flow and constant pressure air supply requirements of the continuous atomization spraying stage.

[0085] In this embodiment, the nozzle 109 is provided with a baffle ring 400 for controlling the gas flow. A piston b401 is slidably connected to the bottom of the nozzle 109. The piston b401 can slide along the nozzle 109. A spring c402 is connected between the piston b401 and the nozzle 109 to provide a return force, so that the piston b401 does not cooperate with the baffle ring 400 when there is no external force, and the gas can enter the nozzle 109.

[0086] Reference Figure 6 As shown, a rotating shaft 403 is rotatably connected inside the spraying station 106, and a three-axis convex arm 404 is fixedly connected to the rotating shaft 403. One end of the piston b401 is provided with a boss 405 structure, which extends to one side of the three-axis convex arm 404 and can be pushed or released by it.

[0087] Reference Figure 7 As shown, the spraying station 106 has a connecting groove 406, in which a gear 407 is rotatably connected. One end of a rotating shaft 403 passes through the spraying station 106 and extends into the groove, where it is fixedly connected to the gear 407, forming a linkage structure. A rack 408 is provided on the frame 204, meshing with the gear 407. The rack 408 is arranged vertically and is used to mesh with the gear 407 during the up-and-down movement of the spraying station 106.

[0088] With the above setup, after the first coat of paint is completed, the spraying station 106 moves upward along the guide rail under the drive of the lead screw a301, preparing to enter the second coat of paint process. During the upward movement of the spraying station 106, the gear 407 meshes with the rack 408 fixed on the frame 204. Since the rack 408 is a fixed structure, the upward movement of the spraying station 106 causes the gear 407 to rotate, thereby driving the rotating shaft 403 to rotate synchronously.

[0089] As the rotating shaft 403 rotates, it drives the three-axis convex arm 404 connected to it to perform periodic rotational motion. For example... Figure 8 As shown, Figure 8 The spring c402 is in a compressed state and has potential energy. When one of the shafts of the three-axis cam arm 404 disengages from the support of the boss 405, the spring c402 releases its potential energy, the piston b401 is displaced and moves away from the air baffle ring 400, a gas channel is formed inside the nozzle 109, and the gas is ejected, completing one gas jet process.

[0090] As the shaft 403 continues to rotate, another protrusion of the three-axis convex arm 404 contacts and presses against the boss 405 again, pushing it back to the position where it fits against the air baffle ring 400. The spring c402 is then compressed again, and the piston b401 closes the gas passage, stopping the gas output from the nozzle 109. Through the periodic rotation of the three-axis convex arm 404, this "contact to release to contact" cycle can be continuously performed, achieving the rhythmic opening and closing of the airflow from the nozzle 109, thus creating a mechanical airflow pulse jet effect.

[0091] In this embodiment, the precise control of the jet pulse rhythm can be achieved by relying on the mechanical meshing and linkage between the spraying stage 106 and the rack 408 during the upward movement. It has the advantages of simple structure and strong synchronization, and can effectively realize the redistribution of atomized droplets and film optimization, thereby improving the uniformity of spraying.

[0092] Reference Figure 8 As shown, in this embodiment, a connecting rod a409 is rotatably connected to the bottom of the piston a309. The connecting rod a409 is a short-axis rocker structure, with one end hinged to the bottom of the piston a309 and the other end rotatably connected to the connecting rod b410. The connecting rod b410 is elongated, with one end connected to the air baffle ring 400, used to drive the air baffle ring 400 to achieve axial sliding. The air baffle ring 400 is slidably connected to the inner wall of the nozzle 109 through a spline structure, and has axial movement. A spring d411 is also connected between the air baffle ring 400 and the nozzle 109. The spring d411 is used to provide a return force to the air baffle ring 400, keeping it in its initial closed position when no external force is applied.

[0093] With the above setup, during the downward movement of the spraying station 106 and the execution of the first spraying, the pressure plate 304 descends under the drive of the lead screw. The liquid release agent inside the housing 302, under air pressure, flows through the rigid pipe 307, the flexible hose a308, and the liquid pipe 107 into the connecting pipe 110, and then into the spray nozzle 109. When the liquid enters the connecting pipe 110, it applies downward hydraulic pressure to the piston a309, causing the piston a309 to slide downwards along the channel of the connecting pipe 110.

[0094] At this time, the downward movement of piston a309 causes it to swing through connecting rod a409 connected to its bottom, further driving connecting rod b410 to move, thereby pushing the air baffle ring 400 to slide along the axial direction of nozzle 109 and overcoming the tension of spring d411. Spring d411 is stretched, storing elastic potential energy, and air baffle ring 400 moves away from its original closed position. In this state, even if the rotating shaft 403 has been rotated by rack 408 and the triaxial cam arm 404 acts on piston b401, piston b401 cannot contact the air baffle ring 400, which has been moved away beforehand, within its maximum range of motion. This ensures that the gas channel remains open during the first coat of spraying, ensuring that the atomization process of the release agent is not disturbed, and achieving continuous, stable, and high-quality atomized spraying.

[0095] After the first coat of paint is applied, the spraying station 106 moves back in the opposite direction (upwards), while the motor b300 simultaneously drives the pressure plate 304 to rise in the opposite direction. As the air pressure inside the housing 302 decreases and gradually forms a negative pressure, the liquid supply stops, the hydraulic pressure disappears, and the piston a309 returns to its upward position under the action of the pressure difference between the spring b310 and the inner cavity. The upward movement of the piston a309 causes the connecting rod a409 to swing in the opposite direction, releasing the potential energy of the spring d411 and pushing the air baffle ring 400 back to its original position, restoring it to its initial state.

[0096] At this point, the baffle ring 400 returns to its position to seal the air passage of the nozzle 109. In conjunction with the piston b401 driven by the three-axis convex arm 404 during the second stage of spraying, when the convex arm shaft presses against the boss 405, it compresses and displaces, causing it to conform to the baffle ring 400 and seal the gas passage. When the convex arm rotates away, the spring c402 releases the piston b401, allowing gas to instantly enter the nozzle 109, completing one pulse jet spray action. This cycle creates rhythmic jet disturbance, redistributing the release agent film within the mold and improving the uniformity of droplet spreading.

[0097] 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. An injection mold with auxiliary material feeding after ejection, characterized in that, include: A mold table (100) is provided with a die (101) and a punch (102). A drive unit (103) is provided between the mold table (100) and the die (101) and punch (102) for moving the die (101) and punch (102). A plurality of ejector pins (104) are provided on the die (101), and the drive unit (103) can allow the plurality of ejector pins (104) to slide in the die (101) when the die (101) is moved to a predetermined position; The conveying part (105) located on the top of the mold table (100) is located at the bottom of the die (101) and the punch (102), and has a preset distance between them, for conveying the mold. A spraying station (106) is provided on the mold table (100). A liquid pipe (107) and an air pipe (108) are connected on the spraying station (106). A plurality of nozzles (109) are connected on the air pipe (108). A connecting pipe (110) connected to the nozzles (109) is connected on the liquid pipe (107). A spraying component located between the mold table (100) and the spraying table (106) is used to deliver release agent to the liquid pipe (107) and gas to the gas pipe (108); The drive unit (103) includes a frame (204) connected to the mold table (100), and two hydraulic cylinders (205) are connected to the frame (204). The spraying component is capable of delivering a release agent into the nozzle (109) when the spraying table (106) is moved downward, and the spraying component is capable of stopping the delivery of the release agent when the spraying table (106) is moved upward; The spraying component is capable of intermittently supplying gas to the nozzle (109) when the spraying table (106) is moved upward; The nozzle (109) is provided with an air baffle ring (400). A piston b (401) is slidably connected to the bottom of the nozzle (109). A spring c (402) is connected between the piston b (401) and the nozzle (109). A rotating shaft (403) is rotatably connected inside the spraying table (106). A three-axis convex arm (404) is connected to the rotating shaft (403). One end of the piston b (401) is connected to a boss (405) extending to one side of the three-axis convex arm (404). A connecting groove (406) is opened on the spraying table (106). A gear (407) is rotatably connected inside the connecting groove (406). The rotating shaft (403) extends into the connecting groove (406) and is connected to the gear (407). A rack (408) that meshes with the gear (407) is connected to the frame (204).

2. The injection mold for auxiliary material feeding after ejection according to claim 1, characterized in that, The conveying unit (105) includes a conveying frame (200) connected to the top of the mold table (100). The conveying frame (200) is provided with a plurality of conveying shafts (201), and a conveyor belt (202) is commonly fitted on the plurality of conveying shafts (201). A motor a (203) connected to one of the conveying shafts (201) is connected to the conveying frame (200).

3. The injection mold for auxiliary material feeding after ejection according to claim 1, characterized in that, The die (101) is connected to the drive shaft of one of the cylinders (205), and the punch (102) is connected to the drive shaft of the other cylinder (205).

4. The injection mold for auxiliary material feeding after ejection according to claim 3, characterized in that, A top plate (206) is connected to one side of the die (101), and an ejector pin (104) is connected to the top plate (206). One end of the ejector pin (104) extends into the mold cavity on the die (101). A spring a (207) is connected between the top plate (206) and the die (101). An avoidance opening (208) is provided on the top plate (206) to avoid the oil cylinder (205).

5. The injection mold for auxiliary material feeding after ejection according to claim 3, characterized in that, The spraying component includes a motor b (300) connected to the frame (204), a lead screw a (301) connected to the drive shaft of the motor b (300), and a spraying table (106) slidably connected to the frame (204) and threadedly engaged with the lead screw a (301).

6. The injection mold for auxiliary material feeding after ejection according to claim 5, characterized in that, The spraying component also includes a housing (302) connected to the bottom of the mold table (100). A feed pipe (303) is connected to the housing (302). A pressure plate (304) is slidably connected inside the housing (302). The height of the pressure plate (304) is higher than the connection between the feed pipe (303) and the housing (302). A threaded pipe (305) is connected to the top of the pressure plate (304). A lead screw (306) is connected to the bottom of the lead screw a (301). The lead screw b (306) passes through the mold table (100) and the housing (302) and extends to the bottom of the mold table (100). The interior of the housing (302) is threadedly fitted with the threaded tube (305). A rigid tube (307) is fixedly connected inside the housing (302). The top of the rigid tube (307) extends to the top of the pressure plate (304). The pressure plate (304) is slidably sleeved on the rigid tube (307). A flexible hose a (308) is connected to the top of the rigid tube (307). One end of the flexible hose a (308) passes through the housing (302) and extends into the frame (204) through the mold table (100), and is connected to the liquid pipe (107) on the spraying table (106).

7. The injection mold for auxiliary material feeding after ejection according to claim 3, characterized in that, The bottom of the connecting pipe (110) is connected to a piston a (309), and a spring b (310) is connected between the piston a (309) and the connecting pipe (110).

8. An injection mold for auxiliary material feeding after ejection according to claim 6, characterized in that, The spraying component also includes an air pump (311) connected to one side of the housing (302). The air outlet of the air pump (311) is connected to a hose b (312). One end of the hose b (312) extends into the frame (204) and is connected to the air pipe (108).

9. An injection mold for auxiliary material feeding after ejection according to claim 7, characterized in that, The bottom of the piston a (309) is rotatably connected to a connecting rod a (409), the bottom of the connecting rod a (409) is connected to a connecting rod b (410), one end of the connecting rod b (410) is connected to the air baffle ring (400), the air baffle ring (400) is slidably connected to the nozzle (109), and a spring d (411) is connected between the air baffle ring (400) and the nozzle (109).

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