Injection mold for assisting blanking after ejection

Abstract

The invention relates to the technical field of injection molding, and discloses an injection mold for assisting blanking after ejection, comprising: a mold table, on which a female mold and a male mold are arranged; the driving part is arranged among the die table, the female die and the male die and is used for moving the female die and the male die; the plurality of thimbles are arranged on the female die; when the driving part moves the female die to a preset position, the plurality of thimbles can slide in the female die; according to the application, the atomized release agent is uniformly sprayed under the opening state of the mold, and then the attached liquid drops are redistributed by utilizing gas pulse disturbance, so that a more stable and continuous release agent film layer is constructed. In the first-stage atomization spraying process, a spray head atomizes a release agent into fine liquid drops under the action of high-speed gas, the fine liquid drops are sprayed to the surface of a female die cavity of a die from top to bottom, and the coverage and consistency can still be ensured even in a deep area with a complex curvature of the die cavity. And by controlling the liquid flow to be constant, shallow accumulation and sagging phenomena are avoided, and more stable primary film forming quality is realized.

Description

Technical Field

[0001] The invention relates to the technical field of injection molding, and in particular to an injection mold with auxiliary blanking after ejection. Background Art

[0002] The mold is the core equipment for mass-producing thermoplastic products. Its structure usually consists of a movable mold, a fixed mold, a pouring system, a cooling system, and an ejection mechanism. During the molding cycle, plastic is injected into the mold cavity under high temperature and high pressure. After cooling and solidification, the mold is opened and the product is pushed out of the mold by the ejection mechanism. In order to reduce demoulding resistance, improve molding efficiency, and prevent the product from adhering to the mold cavity, a release agent is often sprayed on the surface of the injection mold to assist the product in smoothly releasing from the mold. Traditional molds such as flat-plate molds, shallow box molds, kettle molds, etc., have relatively shallow and flat cavities, so the release agent can be sprayed more evenly, and the product is easy to fall naturally or be clamped by a robot after demoulding.

[0003] However, there are significant differences in the structural characteristics of injection molds for products such as helmets. The mold cavity of a helmet mold is usually deep and the molding surface is complex, making the demolding process more difficult. Especially in the release agent spraying stage before injection molding, due to the deep and narrow mold cavity, the spray entry is limited, resulting in uneven distribution of the release agent inside the mold cavity. The shallow area is sprayed with a larger amount, while the deep cavity area is not sprayed enough. As a result, some areas of the product after molding have high adhesion and high demolding resistance, and the phenomenon of "incomplete ejection" or "mold sticking" often occurs. If you try to increase the spray pressure or flow rate to enhance the spray coverage, it is easy to cause accumulation in the area of ​​excessive spraying, causing mold contamination and even affecting the appearance quality of the product.

[0004] Therefore, in such deep-cavity and complex molds, it is difficult to ensure stable and reliable demolding effects by relying solely on traditional spraying of release agents. Summary of the Invention

[0005] In view of the deficiencies of the prior art, the present invention provides an injection mold with auxiliary blanking after ejection, aiming to alleviate the above problems at least to a certain extent.

[0006] The above technical objectives of the present invention are achieved through the following technical solutions: An injection mold with auxiliary blanking after ejection, comprising: A mold table, wherein a concave mold and a convex mold are provided on the mold table; A driving part provided between the die table and the concave die and the convex die, for moving the concave die and the convex die; a plurality of ejectors provided on the die, wherein the driving unit is capable of allowing the plurality of ejectors to slide in the die when the die is moved to a predetermined position; A conveying portion provided on the top of the mold table, located at the bottom of the concave mold and the convex mold, with a preset distance between the two, for conveying the model; A spraying station is provided on the mold table, wherein the spraying station is connected with a liquid pipe and an air pipe, the air pipe is connected with a plurality of nozzles, and the liquid pipe is connected with a connecting pipe connected with the nozzle; The spraying component provided between the mold table and the spraying table is used for conveying the release agent to the liquid pipe and conveying the gas to the gas pipe.

[0007] Preferably, the conveying part includes a conveying frame connected to the top of the mold table, the conveying frame is provided with a plurality of conveying shafts, a conveyor belt is commonly sleeved on the plurality of conveying shafts, and the conveying frame is connected to a motor a connected to one of the conveying shafts.

[0008] Preferably, the driving part includes a frame connected to the mold table, two oil cylinders are connected to the frame, the female mold is connected to the driving shaft of one of the oil cylinders, and the male mold is connected to the driving shaft of the other oil cylinder.

[0009] Preferably, a top plate is connected to one side of the die, the ejector pin is connected to the top plate, one end of the ejector pin extends into the mold cavity on the die, a spring a is connected between the top plate and the die, and an avoidance opening for avoiding the oil cylinder is opened on the top plate.

[0010] Preferably, the spraying component includes a motor b connected to the frame, a lead screw a is connected to the driving shaft of the motor b, and the spraying platform is slidably connected to the frame and threadedly engaged with the lead screw a.

[0011] Preferably, the spraying component can deliver the release agent to the nozzle when the spraying table is moved downward, and the spraying component can stop delivering the release agent when the spraying table is moved upward; The spraying component also includes a box body connected to the bottom of the mold table, the box body is connected to a feed pipe, and a pressure plate is slidably connected to the box body. The height of the pressure plate is higher than the connection point between the feed pipe and the box body, and the top of the pressure plate is connected to a threaded tube. The bottom of the screw a is connected to the screw b, and the screw b passes through the mold table and the box body, extends to the interior of the box body and threadedly cooperates with the threaded tube. A hard tube is fixedly connected to the box body, and the top of the hard tube extends to the top of the pressure plate. The pressure plate is slidably mounted on the hard tube. The top of the hard tube is connected to a hose a, and one end of the hose a passes through the box body and the mold table and extends into the frame, and is connected to the liquid pipe on the spraying table.

[0012] Preferably, the bottom of the connecting pipe is connected to a piston a, and a spring b is connected between the piston a and the connecting pipe.

[0013] Preferably, the spraying component further comprises an air pump connected to one side of the box body, the air outlet end of the air pump is connected to a hose b, one end of the hose b extends into the frame and is connected to the air pipe.

[0014] Preferably, the spraying component is capable of intermittently delivering gas to the spray head when the spraying table is moved upward; An air-blocking ring is provided in the spray head, and a piston b is slidably connected to the bottom of the spray head. A spring c is connected between the piston b and the spray head. A rotating shaft is rotatably connected in the spray table, and a three-axis cam is connected to the rotating shaft. One end of the piston b is connected to a boss extending to one side of the three-axis cam. A connecting groove is provided on the spray table, and a gear is rotatably connected in the connecting groove. The rotating shaft extends into the connecting groove and is connected to the gear. A rack meshing with the gear is connected to the frame.

[0015] 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-blocking ring, the air-blocking ring is slidably connected to the nozzle, and a spring d is connected between the air-blocking ring and the nozzle.

[0016] In summary, the present invention mainly has the following beneficial effects: This application first completes the uniform spraying of atomized release agent with the mold open, then uses gas pulse disturbance to redistribute the attached droplets, thereby constructing a more stable and continuous release agent film layer. During the first stage of atomization spraying, the nozzle, under the action of high-speed gas, atomizes the release agent into fine droplets, which are sprayed from top to bottom onto the surface of the mold cavity. Even in deep mold cavities with complex curvatures, coverage and consistency are still ensured. By controlling the liquid flow rate to be constant, shallow accumulation and sagging are avoided, achieving more stable initial film quality.

[0017] In the second stage, the spray system closes the liquid channel, maintaining only a pulsed airflow output. This intermittently disturbs the droplet film that has adhered to the mold cavity surface in the first stage. The periodic thrust of the airflow causes the droplets to slightly move or redistribute along the mold contour, particularly pushing droplets accumulated in shallow areas deeper into the mold cavity, compensating for underspray in blind spots. Furthermore, the pulsed state avoids premature drying caused by continuous airflow, promoting the natural spread of droplets and slow film formation, thereby improving film uniformity and surface integrity.

[0018] After spraying, the mold closes for injection molding. The molten plastic enters the mold cavity through the injection channel on the punch and is quickly shaped by the cooling effect of the heat exchange channel within the mold. The mold then opens and the ejector ejects the product. The release agent's insulating effect ensures smooth demolding without cracking or sticking. The product is then smoothly transported to the next process via a conveyor located below the mold, achieving automated unloading. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a cross-sectional schematic diagram of the overall structure of the present invention; Figure 3 is another schematic cross-sectional view of the overall structure of the present invention; Figure 4 It is a schematic diagram of the structure of the male and female molds of the present invention; Figure 5 This is a schematic structural diagram of hose a and hose b of the present invention; Figure 6 is a schematic cross-sectional view of the spraying station structure of the present invention; Figure 7 yes Figure 3 A magnified schematic diagram of the local structure at point a; Figure 8 It is a schematic cross-sectional view of the nozzle structure of the present invention.

[0020] Reference numerals: 100, mold table; 101, die; 102, punch; 103, drive unit; 104, ejector pin; 105, conveying unit; 106, spray station; 107, liquid pipe; 108, air pipe; 109, nozzle; 110, connecting pipe; 200, conveyor frame; 201, conveyor shaft; 202, conveyor belt; 203, motor a; 204, frame; 205, oil cylinder; 206, top plate; 207, spring a; 208, avoidance opening; 300, motor b; 301, screw a; 302, housing; 303, feed pipe; 304, pressure plate; 305, threaded pipe; 306, screw b; 307, rigid pipe; 308, hose a; 309, piston a; 310, spring b; 311, air pump; 312, hose b; 400, air retaining ring; 401, piston b; 402, spring c; 403, rotating shaft; 404, three-axis cam; 405, boss; 406, connecting groove; 407, gear; 408, rack; 409, connecting rod a; 410, connecting rod b; 411, spring d. DETAILED DESCRIPTION

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] refer to Figures 1-8 This embodiment provides an injection mold with auxiliary blanking after ejection, including a mold table 100, a die 101 and a punch 102, a driving part 103, an ejector pin 104, a conveying part 105, a spraying station 106, spraying components and multiple nozzles 109.

[0023] Reference Figure 2 As shown, the mold table 100 serves as a structural foundation for mounting a die 101 and a punch 102, which cooperate to form an injection mold cavity. The punch 102 is provided with an injection channel. A drive unit 103 is positioned between the mold table 100 and the mold, driving the die 101 and punch 102 in relative left-right motion, opening and closing the mold. During the mold opening process, the drive unit 103 also drives multiple ejector pins 104 within the die 101 to slide along the mold cavity, ejecting the molded product and facilitating smooth demolding.

[0024] like Figure 1 as well as Figure 2 As shown, the conveying portion 105 is arranged 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, for receiving the ejected model after demoulding and conveying it to the next station.

[0025] A spray station 106 is mounted on the mold table 100 and is provided with an air pipe 108 and a liquid pipe 107. Multiple spray heads 109 are mounted on the spray station 106 and are each connected to a connecting pipe 110. Connecting pipes 110 communicate with the liquid pipe 107 to supply liquid to the spray heads 109. The spray heads 109 are also connected to the air pipe 108.

[0026] A spraying unit is located between the mold stage 100 and the spraying station 106. The spraying unit is used to deliver release agent to the liquid pipe 107 and gas to the gas pipe 108. The spraying unit is motion-coupled with the spraying station 106, automatically adjusting its liquid and gas supply based on the movement of the spraying station 106.

[0027] In the first stage, when the spraying platform 106 is in the process of descending, the spraying component starts to supply liquid to the liquid pipe 107 and continuously supplies air to the air pipe 108.

[0028] In the second stage, the spraying station 106 moves upward from the bottom. As the spraying station 106 moves upward to the set height, the spraying unit automatically stops supplying liquid to the liquid pipe 107. At the same time, the spraying unit switches the air supply mode to the air pipe 108 from continuous air supply to intermittent air supply, that is, it sprays high-speed air flow in pulses to the nozzle 109 according to the set rhythm.

[0029] With the above arrangement, before injection molding, the mold is first opened by controlling the driving unit 103, and the die 101 and the punch 102 are separated in the left-right direction. Subsequently, the spray station 106 moves toward the mold, and the spraying component starts working, continuously delivering the release agent to the liquid pipe 107, while sending high-speed gas to the air pipe 108. After the liquid and gas merge inside the nozzle 109, the release agent is atomized under the action of the high-speed airflow to form a fine spray, which is evenly sprayed on the cavity surface of the die 101. The spraying process is carried out from top to bottom, ensuring that effective coverage can be obtained even in locations with deeper cavities and complex geometric structures. The liquid flow rate of the release agent is kept constant, effectively avoiding liquid accumulation or sagging in shallow cavity areas due to excessive spraying, thereby forming a uniform and continuous isolation film layer in the entire cavity.

[0030] After the first spraying pass is complete, spray station 106 retreats in the opposite direction. During this process, the spraying unit automatically shuts off liquid delivery, cutting off the flow path in liquid pipe 107 and preventing the spray head 109 from receiving further release agent. Simultaneously, air supply from air pipe 108 remains in place, but instead enters a pulse control phase, periodically delivering gas to the spray head 109 at a set rhythm. This process utilizes a pulsed spray pattern, characterized by short bursts of high-pressure spray followed by pauses and subsequent re-spraying, creating a rhythmic, intermittent, and turbulent airflow.

[0031] This pulsed jet no longer sprays new release agent, but instead acts on the film of droplets already attached to the mold surface. Because the droplets formed by the first spray pass are still in a semi-fluid state, their interfacial tension is low and they are easily deformed by airflow disturbances. Driven by the pulsed airflow, droplets adhering to shallow areas of the mold cavity or curved edges are redistributed, some being pushed to the bottom of the cavity or to deep, hard-to-reach blind spots, creating a "secondary coating" of liquid. This action optimizes the film thickness distribution, achieving a consistent distribution across shallow and deep structures, without changing the total release agent dosage, thereby avoiding uneven accumulation in shallow areas and sparse distribution in deep areas.

[0032] Furthermore, the shearing effect of the intermittent airflow also causes locally attached droplets to expand and spread, increasing their contact area with the mold cavity surface and improving the quality of the release agent film. Furthermore, because the spray station 106 maintains steady movement during this process, the entire mold cavity surface is sequentially exposed to air pressure under the airflow disturbance, completing a dynamic optimization process of "reflow, redistribution, and reattachment" of the release agent for deep and complex cavities.

[0033] Compared to traditional spraying methods, the disturbance effect of this application causes atomized droplets that have already landed in the shallow part of the mold to undergo slight displacement and deformation, achieving redistribution along the mold cavity contour under the guidance of surface tension. This is particularly true in deep-cavity molds such as helmets, where some structures are obstructed or curved, making it difficult for conventional spraying to effectively penetrate the release agent. However, this type of airflow pulse creates a "layer-by-layer push wave" effect, which can propel the droplets into the deep parts of the mold and blind corners, replenishing areas not fully covered by the first spray pass, thereby improving overall film uniformity.

[0034] At the same time, intermittent air supply effectively reduces the total heat and shear of the airflow per unit time, suppressing the risk of the droplets drying out and forming a shell at the moment of attachment, and helping the droplets form a continuous, seamless, and uniform film layer on the mold cavity surface. This method is particularly suitable for deep-cavity injection molds such as helmets, significantly improving film uniformity, film quality, and spray reliability in deep-cavity structures without increasing the amount of release agent used.

[0035] After spraying is complete, the spray station 106 returns to its original position, and the mold begins to close. The drive unit 103 moves the die 101 and punch 102 together in a horizontal direction, forming a closed mold cavity. The molten plastic is injected into the mold cavity through the injection channel on the punch 102, filling and completing the injection molding. After injection is complete, the heat exchange channels within the mold begin to operate. Coolant (usually circulating water) flows through the channels within the die 101 and punch 102, removing heat from the mold cavity walls and the injected material. This ensures that the molded product completes heat exchange and sets its shape quickly, ensuring dimensional stability and molding quality.

[0036] After cooling is complete, the mold opens, the die 101 moves to one side, and multiple ejector pins 104 within the mold are simultaneously pushed out, ejecting the formed product from the mold cavity. The release agent film layer allows the product to be smoothly released from the mold wall, effectively preventing problems such as sticking, cracking, and surface stringing, ensuring product integrity and surface quality. The ejected product naturally falls onto the conveyor 105 located below the mold table 100. Maintaining a preset distance from the mold, conveyor 105 is capable of receiving the product and transporting it to subsequent processing stations, completing automated unloading.

[0037] In this application, the secondary treatment stage cooperates with the first atomization spraying to form a two-stage release agent film-forming system, which significantly improves the uniformity of spray coverage on the mold cavity surface and minimizes the quality risks such as mold 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.

[0038] In this embodiment, the conveying portion 105 includes a conveying frame 200 connected to the top of the mold table 100, and the conveying frame 200 is horizontally arranged in the area below the die 101 and the punch 102, and is fixed to the mold table 100 by a supporting structure. The conveying frame 200 is provided with a plurality of conveying shafts 201 arranged in parallel and spaced apart along the conveying direction, and a ring-shaped conveyor belt 202 is commonly sleeved between the plurality of conveying shafts 201. The conveyor belt 202 is made of a flexible heat-resistant material with a certain 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, and the drive shaft of the motor a203 is connected to one of the conveying shafts 201 for driving the conveying shaft 201 to rotate, thereby driving the entire conveyor belt 202 to perform a cyclic transmission at a preset speed.

[0039] With this setup, after injection molding is complete and cooling has set, the drive unit 103 controls the left-right separation of the female mold 101 and the male mold 102, opening the mold. Simultaneously, multiple ejector pins 104 within the female mold 101 activate to eject the molded plastic product. Once ejection is complete, the product naturally falls under the influence of gravity. Because the conveyor belt 202 maintains a reasonable distance from the bottom of the mold cavity, the product lands directly on the surface of the conveyor belt 202. At this point, the motor a203 drives the conveyor shaft 201, driving the conveyor belt 202, and the product is smoothly transported to the material receiving position outside the mold or to a subsequent processing station.

[0040] Since the conveyor belt 202 is a continuous loop structure, it can achieve matching of the molding cycle and the conveying rhythm, which not only avoids the delay and instability factors caused by manual intervention, but also greatly improves the degree of automation in the unloading process.

[0041] In this embodiment, the drive unit 103 comprises a frame 204 connected to the mold table 100. This frame 204, constructed of welded steel, is fixedly mounted above the mold table 100, providing structural support and a drive mounting base for the opening and closing of the mold. Two hydraulic cylinders 205 are symmetrically mounted on the frame 204, secured to either side of the frame 204. Their drive shafts are connected to the die 101 and punch 102, respectively. The drive shaft of one cylinder 205 is connected to the die 101, while the drive shaft of the other cylinder 205 is connected to the punch 102.

[0042] Through the above arrangement, when the injection molding starts, the two oil cylinders 205 drive shafts move simultaneously, causing the die 101 and the punch 102 to move laterally in opposite directions, respectively, to realize the mold opening and closing state, providing working space for subsequent spraying and injection molding operations.

[0043] After the mold is opened, the spray station 106 moves to the top of the die 101 to perform an atomizing spraying operation and complete a secondary pulse airflow disturbance, effectively forming a uniform and continuous release agent film layer. After the spraying is completed, the two oil cylinders 205 drive shafts move, driving the die 101 and the punch 102 to move synchronously toward the middle, achieving high-precision closure of the mold. After the injection molding and cooling are completed, the mold is opened again through the reverse action of the two oil cylinders 205, and the demoulding action is completed in conjunction with the internal ejector 104 structure. The use of this dual-cylinder 205 drive structure can not only complete the mold separation and closing cycle in a relatively short time, improving the molding cycle efficiency, but also its output direction is stable.

[0044] In this embodiment, a top plate 206 is connected to one side of the die 101. This top plate 206 is a flat metal plate positioned outside the die 101 and extending along the length of the die 101. Multiple ejector pins 104 are arranged and fixedly attached to the top plate 206, with one end extending into the mold cavity of the die 101. To achieve elastic return, springs a207 are provided between the top plate 206 and the die 101. Multiple springs a207 are distributed between the top plate 206 and the die 101 to automatically return the top plate 206 to its original position after ejection.

[0045] Furthermore, to prevent interference between the top plate 206 and the mold drive unit 103, a clearance opening 208 is provided on the top plate 206 to clear the mold drive cylinder 205. The clearance opening 208 is located in the middle of the top plate 206, corresponding to the area where the cylinder 205 is installed. Its shape matches the contour of the cylinder 205 to prevent structural interference during mold movement.

[0046] Reference Figure 4 As shown, with the above arrangement, after injection molding and cooling are complete, the drive unit 103 controls the left-right separation of the female mold 101 and the male mold 102, opening the mold. As the female mold 101 moves to the open position, the ejector plate 206, located outside the female mold 101, contacts the frame 204 under the action of the oil cylinder 205. The multiple ejector pins 104 on the ejector plate 206 can move relative to the female mold 101, with their front ends entering the mold cavity to eject the shaped plastic product from the mold cavity.

[0047] During the ejection process, ejector pins 104 directly act on the back of the part and cooperate with the evenly distributed release film within the mold cavity, effectively reducing ejection resistance and preventing sticking, damage, or surface stringing. After being ejected, the part naturally falls onto conveyor belt 202 below the mold, completing unloading.

[0048] As the ejection action is completed, when the mold is closed next time, the ejector plate 206 automatically returns to its original position under the elastic force of the spring a207, driving the ejector pin 104 to retract as a whole to the outside of the die 101 and return to the standby state.

[0049] The arrangement of the avoidance opening 208 can prevent the top plate 206 from interfering with the oil cylinder 205 during the entire ejection or reset stroke, thereby ensuring safe, continuous and reliable operation of the structure.

[0050] In this embodiment, the spraying unit includes a motor b300 mounted on the frame 204. The motor b300 is fixedly mounted on the upper end of the frame 204, and its output shaft is connected to a lead screw a301. The spraying station 106 is slidably connected to a guide rail structure in the middle of the frame 204 and is connected to the lead screw a301 via a threaded structure. That is, when the motor b300 drives the lead screw a301 to rotate, the lead screw pitch and the nut propel the spraying station 106 in a reciprocating linear motion along the frame 204.

[0051] With this setup, before the injection molding cycle begins, motor b300 is activated, rotating lead screw a301. The threaded connection between the lead screw and spray station 106 slowly slides the spray station 106 along the guide rails of frame 204 toward the mold. This transmission structure ensures a controlled and repeatable spray stroke for the spray head 109. This eliminates vibration and impact throughout the movement of the spray station 106, helping to ensure consistent airflow direction and a stable spray process.

[0052] In this embodiment, the spraying unit further comprises a box 302 disposed at the bottom of the mold table 100. The interior of the box 302 is used to contain the liquid release agent and ensure a stable liquid supply. A feed pipe 303 is connected to the box 302 for injecting the release agent into the box 302. A pressure plate 304 is provided within the box 302. The pressure plate 304 is capable of sliding vertically within the box 302, and its top is higher than the connection between the feed pipe 303 and the box 302.

[0053] A threaded tube 305 is fixedly connected to the top of the pressure plate 304, mating with the screw structure below. Screw a301, mounted on the frame 204, drives the spray station 106 horizontally. Its bottom end is connected to a longitudinally extending screw b306. Screw b306 passes through the mold table 100 and the housing 302, extending into the interior of the housing 302. Its threaded lower end engages with the threaded tube 305 at the top of the pressure plate 304, forming a vertical propulsion mechanism. The exit section of screw b306 is a smooth shaft section.

[0054] A rigid tube 307 is fixed inside the housing 302. The top of the tube 307 is elevated above the pressure plate 304. The pressure plate 304 is slidably mounted on the outer wall of the tube 307, maintaining its position and guidance during its vertical movement. A flexible tube a308 is connected to the top of the tube 307. One end of the flexible tube a308 passes through the housing 302 and the mold table 100, extending into the frame 204 and into communication with the liquid pipe 107 on the spray station 106, forming a liquid supply path for the release agent.

[0055] With this arrangement, during spraying, motor b300 rotates lead screw a301. Because the spray station 106 and lead screw a301 engage with each other, the rotation drives the spray station 106 to slide along the guide rails of frame 204 toward the mold, effectively moving the spray station 106 downward. Simultaneously, a vertical lead screw b306 is connected to the bottom end of lead screw a301. Rotation of lead screw a301 simultaneously drives lead screw b306.

[0056] Since the lower end of the lead screw b306 is threadedly connected to the threaded tube 305 on the top of the pressure plate 304, its rotation will further drive the pressure plate 304 to move downward in the vertical direction.

[0057] The pressure plate 304 descends, gradually covering the liquid channel above the feed port and isolating the feed pipe 303 from the cavity to form a closed structure. At this time, the pressure plate 304 continues to compress the cavity space downward, the volume of the gas in the cavity is proportionally reduced, and the internal air pressure gradually rises, forming a uniform pressure on the liquid. Under the action of this stable air pressure, the release agent liquid at the bottom of the box 302 is continuously and stably pressed into the hard tube 307 fixed in the box 302. The motor b300 always works at a constant speed, and the downward movement speed of the pressure plate 304 is constant, so that the change pattern of the cavity air pressure is controllable, and the liquid is always in an approximately constant pressure drive state during the entire supply process. In this way, during the downward movement of the spray station 106, the release agent is continuously injected into the nozzle 109 at a constant flow rate, ensuring the atomization uniformity and liquid supply stability during the spraying process, and effectively improving the coating consistency of the mold cavity surface.

[0058] In this embodiment, a piston a309 is connected to the bottom of the connecting tube 110. The piston a309 is disposed within the liquid inlet channel of the connecting tube 110 and is capable of sliding vertically within the connecting tube 110. A spring b310 is connected between the piston a309 and the connecting tube 110. The spring b310 is used to apply a return force to the piston a309, ensuring that the piston a309 maintains a preset initial position when not under hydraulic pressure.

[0059] With this arrangement, the release agent liquid within the housing 302, pushed by the pressure plate 304, flows through the rigid tube 307 and the flexible tube a308 into the liquid pipe 107, ultimately flowing into the connecting tube 110. When the liquid reaches the bottom of the connecting tube 110, the thrust of the liquid causes piston a309 to compress spring b310 over a short distance, opening the channel at the bottom of the connecting tube 110. This allows the liquid to flow smoothly into the spray head 109, performing the first atomized spray application of the release agent.

[0060] After the spraying station 106 completes the first spraying, it moves back along the original path. The drive shaft of the motor b300 rotates in the opposite direction, and the spraying station 106 and the pressure plate 304 move upward. During this process, the previously compressed closed cavity in the box 302 gradually recovers its original volume. Since the upward movement of the pressure plate 304 can form a relative negative pressure in the cavity, the negative pressure is transmitted to the connecting pipe 110 through the liquid path, which can make the piston a309 that was originally pressed down quickly reset under the return force of the spring b310, thereby closing the bottom channel of the connecting pipe 110 and blocking the continued output of the release agent. This action achieves the purpose of automatically stopping the liquid supply and automatically closing the flow channel through mechanical linkage after the spraying station 106 retreats and the release agent is supplied.

[0061] Reference Figure 3 as well as Figure 5 As shown, in this embodiment, the spraying assembly further includes an air pump 311 fixedly connected to one side of the housing 302. The outlet of the air pump 311 communicates with the air pipe 108 within the mold frame 204 via a hose b312, forming a stable air supply path. The hose b312 flexibly extends to accommodate the dynamic movement of the spraying station 106 during its vertical movement, ensuring a continuous and uninterrupted air supply. The air pump 311 is used to provide the required compressed air to the air pipe 108.

[0062] With this setup, when the mold cavity of spray station 106 moves, air pump 311 is activated. Air pump 311 draws in air from the outside environment, pressurizes it, and continuously delivers it to air pipe 108 within frame 204 via hose b312. Air pipe 108 connects to multiple nozzles 109. When the first spraying pass begins, the constant-pressure airflow output by air pump 311 enters nozzles 109 and mixes with the release agent liquid from liquid pipe 107, creating a high-speed shearing and atomization effect within nozzles 109, ultimately spraying the release agent in a mist onto the mold cavity surface.

[0063] After 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 deposited in the mold cavity. The air pump 311 and the hose b312 form a flexible and efficient air supply structure, which can meet the high flow and constant pressure air supply requirements of the continuous atomization spraying stage.

[0064] In this embodiment, an air-blocking ring 400 for controlling the on-off flow of gas is provided in the nozzle 109. 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 air-blocking ring 400 when there is no external force, and the gas can enter the nozzle 109.

[0065] Reference Figure 6 As shown, the spraying station 106 is rotatably connected to a rotating shaft 403, and a three-axis cam 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 cam 404 and can be pushed or released by it.

[0066] Reference Figure 7 As shown, the spray station 106 is provided with a connecting groove 406, in which a gear 407 is rotatably connected. One end of the rotating shaft 403 passes through the spray station 106 and extends into the groove, where it is fixedly connected to the gear 407, forming a linkage structure. The frame 204 is provided with a rack 408 that meshes with the gear 407. The rack 408 is arranged in a vertical direction and is used to generate relative meshing action with the gear 407 during the vertical movement of the spray station 106.

[0067] With the above arrangement, after the first spraying pass is completed, the spraying station 106 moves upward along the guide rail driven by the lead screw a301, preparing to enter the second spraying pass. During the upward movement of the spraying station 106, the gear 407 engages with the rack 408 fixed to 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.

[0068] When the rotating shaft 403 rotates, it drives the three-axis convex arm 404 connected thereto to perform periodic rotational motion. Figure 8 As shown, Figure 8 The spring c402 is in a compressed state and has potential energy. When one of the axes of the three-axis cam 404 breaks away from the support of the boss 405, the spring c402 releases the potential energy, the piston b401 moves and leaves the air-blocking ring 400, a gas channel is formed inside the nozzle 109, and the gas is ejected, completing a gas gushing process.

[0069] As shaft 403 continues to rotate, another protrusion on triaxial arm 404 contacts and presses against boss 405, forcing it back into contact with air baffle ring 400. This compresses spring c 402 again, sealing the air passageway with piston b 401, and stopping air flow from nozzle 109. The cyclical rotation of triaxial arm 404 maintains this "contact-release-contact" cycle, rhythmically opening and closing the airflow from nozzle 109 and creating a mechanical pulsed jet effect.

[0070] In this embodiment, the precise control of the jet pulse rhythm can be achieved by relying on the mechanical engagement linkage with the rack 408 during the upward movement of the spray table 106. It has the advantages of simple structure and strong synchronization, and can effectively achieve the redistribution of atomized droplets and film optimization, thereby improving the uniformity of spraying.

[0071] Reference Figure 8 As shown, in this embodiment, the bottom of the piston a309 is rotatably connected to a connecting rod a409. The connecting rod a409 is a short-axis rocker structure, one end of which is hinged to the bottom of the piston a309, and the other end is rotatably connected to the connecting rod b410. The connecting rod b410 is in the shape of an elongated strip, one end of which is connected to the air-blocking ring 400, and is used to drive the air-blocking ring 400 to achieve axial sliding. The air-blocking 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-blocking ring 400 and the nozzle 109. The spring d411 is used to provide a return elastic force to the air-blocking ring 400, keeping it in the initial closed position in the absence of external force.

[0072] With this arrangement, as the spray station 106 moves downward and performs the first spraying pass, the pressure plate 304 descends under the drive of the lead screw. Under the action of air pressure, the liquid release agent in the tank 302 flows through the hard tube 307, the soft tube a308, and the liquid tube 107 into the connecting tube 110 and into the spray head 109. When the liquid enters the connecting tube 110, it exerts downward hydraulic pressure on the piston a309, causing it to slide downward along the channel of the connecting tube 110.

[0073] At this time, the downward movement of piston a309 causes the connecting rod a409 connected to its bottom to swing, further driving the connecting rod b410 to move, thereby pushing the air-blocking ring 400 to slide axially along the nozzle 109 and overcome the tension of the spring d411. The spring d411 is stretched, storing elastic potential energy, and the air-blocking ring 400 moves away from its original closed position. In this state, even if the rotating shaft 403 has been rotated by the rack 408 and the three-axis cam 404 acts on the piston b401, it cannot make the piston b401 contact the air-blocking ring 400 that has been moved away in advance within its maximum movement range, thereby ensuring that the gas channel remains open during the first spraying process, ensuring that the release agent atomization process is not disturbed, and achieving continuous, stable, and high-quality atomization spraying.

[0074] After the first spraying pass is complete, the spray station 106 moves back in the opposite direction (upward), while motor b300 simultaneously drives the pressure plate 304 upward. As the air pressure within the chamber 302 decreases and gradually forms a negative pressure, the liquid supply ceases, the hydraulic pressure dissipates, and piston a309 returns upward under the influence of spring b310 and the pressure differential within the chamber. The upward movement of piston a309 causes connecting rod a409 to swing in the opposite direction, releasing the potential energy of spring d411 and pushing the air retaining ring 400 back to its original position, restoring the initial state.

[0075] At this point, air baffle 400 is back in position to seal the air passage to nozzle 109. In conjunction with the movement of piston b401, driven by triaxial cam 404 during the second spraying phase, the cam's shaft presses against boss 405, forcing it to engage air baffle 400 and seal the air passage. When the cam rotates away, spring c402 releases piston b401, which rebounds, instantly allowing air to enter nozzle 109, completing a pulsed jet. This cycle creates a rhythmic jet disturbance, redistributing the release agent film within the mold and improving droplet spread uniformity.

[0076] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. An injection mold with auxiliary blanking after ejection, characterized in that: include: A mold table (100), wherein a concave mold (101) and a convex mold (102) are provided on the mold table (100); A driving portion (103) provided between the mold table (100) and the concave mold (101) and the punch (102), for moving the concave mold (101) and the punch (102); A plurality of ejector pins (104) are provided on the die (101), and the driving unit (103) is capable of allowing the plurality of ejector pins (104) to slide in the die (101) when moving the die (101) to a predetermined position; A conveying portion (105) provided on the top of the mold table (100), located at the bottom of the concave mold (101) and the convex mold (102), with a preset distance between the two, for conveying the model; A spraying station (106) is provided on the mold table (100), wherein the spraying station (106) is connected to a liquid pipe (107) and an air pipe (108), wherein the air pipe (108) is connected to a plurality of spray heads (109), and wherein the liquid pipe (107) is connected to a connecting pipe (110) connected to the spray heads (109); The spraying component provided between the mold table (100) and the spraying table (106) is used to deliver a release agent to the liquid pipe (107) and to deliver gas to the gas pipe (108).

2. The injection mold with auxiliary blanking after ejection according to claim 1, characterized in that: The conveying portion (105) comprises a conveying frame (200) connected to the top of the mold table (100), a plurality of conveying shafts (201) are provided on the conveying frame (200), a conveying belt (202) is commonly sleeved on the plurality of conveying shafts (201), and a motor a (203) connected to one of the conveying shafts (201) is connected to the conveying frame (200).

3. The injection mold with auxiliary blanking after ejection according to claim 1, characterized in that: The driving part (103) includes a frame (204) connected to the mold table (100), two oil cylinders (205) are connected to the frame (204), the die (101) is connected to the driving shaft of one of the oil cylinders (205), and the punch (102) is connected to the driving shaft of the other oil cylinder (205).

4. The injection mold with auxiliary blanking after ejection according to claim 3, characterized in that: A top plate (206) is connected to one side of the die (101), the 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), and an avoidance opening (208) for avoiding the oil cylinder (205) is opened on the top plate (206).

5. The injection mold with auxiliary blanking 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) is connected to the driving shaft of the motor b (300), and the spraying station (106) is slidably connected to the frame (204) and threadedly engaged with the lead screw a (301).

6. The injection mold with auxiliary blanking after ejection according to claim 5, characterized in that: The spraying component is capable of conveying the release agent to the spray head (109) when the spraying station (106) is moved downward, and the spraying component is capable of stopping conveying the release agent when the spraying station (106) is moved upward; The spraying component further comprises a box body (302) connected to the bottom of the mold table (100), the box body (302) is connected to a feed pipe (303), a pressure plate (304) is slidably connected in the box body (302), the height of the pressure plate (304) is higher than the connection point between the feed pipe (303) and the box body (302), the top of the pressure plate (304) is connected to a threaded tube (305), the bottom of the screw a (301) is connected to a screw b (306), the screw b (306) passes through the mold table (100) and the box body (302), and extends to the The interior of the box body (302) is threadedly matched with the threaded tube (305), and a hard tube (307) is fixedly connected to the box body (302). The top of the hard tube (307) extends to the top of the pressure plate (304). The pressure plate (304) is slidably mounted on the hard tube (307). The top of the hard tube (307) is connected to a hose a (308). One end of the hose a (308) passes through the box body (302) and the mold table (100) and extends into the frame (204), and is connected to the liquid pipe (107) on the spraying table (106).

7. The injection mold with auxiliary blanking 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. The injection mold with auxiliary blanking after ejection according to claim 6, characterized in that: The spraying component further includes an air pump (311) connected to one side of the box (302), the air outlet end of the air pump (311) is connected to a hose b (312), and one end of the hose b (312) extends into the frame (204) and is connected to the air pipe (108).

9. The injection mold with auxiliary blanking after ejection according to claim 7, characterized in that: The spraying component is capable of intermittently delivering gas to the spray head (109) when the spraying platform (106) moves upward; An air-blocking ring (400) is provided in the spray head (109), a piston b (401) is slidably connected to the bottom of the spray head (109), a spring c (402) is connected between the piston b (401) and the spray head (109), a rotating shaft (403) is rotatably connected in 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 provided on the spraying table (106), a gear (407) is rotatably connected in the connecting groove (406), the rotating shaft (403) extends into the connecting groove (406) and is connected to the gear (407), and a rack (408) meshing with the gear (407) is connected to the frame (204).

10. The injection mold with auxiliary blanking after ejection according to claim 9, 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-blocking ring (400), the air-blocking ring (400) is slidably connected to the nozzle (109), and a spring d (411) is connected between the air-blocking ring (400) and the nozzle (109).

Images