A vehicle window seal molding device

Abstract

This invention discloses a window sealing strip forming device, relating to the field of injection molding technology. It includes a fixed mold and a movable mold arranged opposite to it. The movable mold includes a movable template. After the fixed mold and the movable mold are closed, they form a molding cavity adapted to the shape of the window sealing strip. An ejector assembly is provided inside the movable mold. The ejector assembly reciprocates along the mold opening and closing direction and is equipped with ejector pins. The ejector pins penetrate the movable template and the movable mold core, and their end faces are flush with the molding surface of the movable mold core. The ejector assembly includes a lower ejector plate, an upper ejector plate, and a segmented control component located between the lower and upper ejector plates. This window sealing strip forming device uses a hydraulic damping unit to achieve adaptive switching of ejection force with varying stroke (gentle, increasing, gentle), and eliminates spring interference through a reset path decoupling. Under pure mechanical drive, it balances reliable demolding, product non-destruction, and control precision.

Description

Technical Field

[0001] This invention relates to the field of injection molding technology, and in particular to a molding device for automotive window sealing strips. Background Technology

[0002] Automotive sealing strips, such as window glass guide channels and door frame sealing strips, are typically manufactured using injection molds for corner or integral molding. During molding, pre-cut rubber strip ends are placed into the mold cavity and locked in place. The injection molding machine injects molten rubber or thermoplastic elastomer material into the closed cavity. After heating and vulcanization or cooling and solidification, the mold is opened, allowing the product to detach from the fixed mold cavity along with the moving mold. Subsequently, the ejector rod of the injection molding machine passes through the moving mold base plate and acts on the mold's ejector plate. The ejector plate drives the ejector pins, ejector blocks, or push plates mounted on it to move along the demolding direction, thereby pushing the molded sealing strip product away from the moving mold core, completing demolding and removing the part, before entering the next molding cycle.

[0003] However, sealing strips are mostly made of low-hardness elastomers such as EPDM rubber and thermoplastic vulcanized rubber. These materials are soft and highly resilient, and some have internal metal skeletons or sealing lips and external surfaces. After molding, there is both a clamping force due to shrinkage and a vacuum suction force formed when the sealed cavity opens, resulting in demolding resistance far greater than that of ordinary rigid plastic parts. Existing ejection methods generally use continuous or uniform ejection from the ejector plate, lacking differentiated control over each stage of demolding. In the initial demolding stage, excessive ejection speed can cause stress concentration at the ejector pin contact points, leading to whitening, puncture, or even tearing of the product. Insufficient ejection force cannot overcome the clamping and suction forces, causing the product to remain trapped in the mold. When the product detaches from the core, the energy accumulated by the suction force and elastic deformation is released, making the product easily ejected or thrown from the ejector pin, resulting in skipping, falling, or tilting.

[0004] Therefore, there are still shortcomings and deficiencies in the existing technology. How to provide a molding device that can improve the mold release properties of soft elastomer products such as sealing strips, and can perform differentiated control of the ejection process in stages, so that the product can maintain stable force in each stage of breaking the adsorption, detaching from the core and finally detaching from the ejector pin, and avoid product damage or material jumping caused by improper ejection rhythm is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] The purpose of this invention is to provide a window sealing strip forming device that solves the technical problems of high demolding resistance of sealing strips, the lack of segmented control in existing uniform ejection, which easily causes product damage, retention or flying material, and makes it difficult to balance demolding reliability and product protection.

[0006] To achieve the above objectives, the present invention provides a vehicle window sealing strip forming device, including a fixed mold and a movable mold disposed opposite to it. The movable mold includes a movable template. After the fixed mold and the movable mold are closed, they enclose a forming cavity adapted to the shape of the vehicle window sealing strip. The moving mold is equipped with an ejector assembly, which reciprocates along the mold opening and closing direction and is equipped with ejector pins. The ejector pins penetrate the moving mold plate and the moving mold core, and their end faces are flush with the forming surface of the moving mold core. The ejection assembly includes a lower top plate, an upper top plate, and a segmented control component located between the lower top plate and the upper top plate. The lower top plate is used to abut against the ejector rod of the injection machine, and the upper top plate is used to mount the ejector pin. The segmented control unit converts the pushing force on the lower ejector plate into different ejection forces on the upper ejector plate within different ejection stroke ranges, and makes the ejection force vary in segments of small, large, and small within the ejection stroke, so that the ejector can eject the product in segments: gentle at the beginning, stronger in the middle, and gentle at the end.

[0007] Preferably, the segmented control component includes a cylinder body, a piston, a telescopic rod, and a connecting pipe. The cylinder body is fixed to the lower top plate and moves with it. The piston is slidably sealed inside the cylinder body and divides the inner cavity of the cylinder body into upper and lower chambers. One end of the telescopic rod is connected to the piston and the other end extends out of the top of the cylinder body and is fixed to the upper top plate. The connecting pipe is located inside the cylinder body and is closed at both ends. A lower oil outlet groove and an upper oil outlet groove are provided through the outer wall of the connecting pipe. After being pressurized, the oil in the lower chamber is discharged into the upper chamber through the lower oil outlet groove, the inner cavity of the connecting pipe, and the upper oil outlet groove. As the connecting pipe moves with the cylinder relative to the piston, the effective flow area of ​​the lower oil outlet groove changes in segments of large, small, and large, so that the ejector pin forms a segmented ejection of the product with a gentle initial stage, a stronger middle stage, and a gentle final stage.

[0008] Preferably, the moving mold also includes pads on both sides below the moving mold plate, with a reserved accommodating space between the two pads; the lower ejector plate and the upper ejector plate are both movably disposed in the accommodating space along the stripping direction, and the lower ejector plate is located below the upper ejector plate, with the lower end of the ejector pin fixedly mounted on the upper ejector plate.

[0009] Preferably, limit plates are fixed on the opposing surfaces of the two pads respectively. Under normal conditions, the upper top plate abuts against and sits on the limit plates, and the height position of the upper top plate is limited by the limit plates.

[0010] Preferably, a plurality of reset springs are arranged in an array above the lower top plate. The reset springs are located between the limiting plate and the lower top plate, and their two ends abut against the limiting plate and the lower top plate respectively, so that the lower top plate is normally kept at the lower limit position. No reset springs are provided above the upper top plate, or only pre-tightening springs with elastic force less than the reset springs and insufficient to affect the segmented ejection control are provided.

[0011] Preferably, a bottom cover is threaded onto one end of the cylinder body, and the bottom cover seals the bottom of the cylinder body; the telescopic rod and the top opening of the cylinder body are slidably sealed together by the end cover and the seal.

[0012] Preferably, the connecting pipe is concentrically arranged inside the cylinder body, with its bottom end connected to the inner wall of the bottom cover. The lower oil outlet groove is opened on the outer wall of the connecting pipe near the bottom of the cylinder body, and the upper oil outlet groove is opened on the outer wall of the connecting pipe near the top of the cylinder body. The flow cross section of the upper oil outlet groove is larger than that of the lower oil outlet groove. By replacing the connecting pipe with different groove widths or lengths, the output force value and stroke range of each segment can be adjusted.

[0013] Preferably, the piston component includes a piston ring, which is slidably sealed inside the cylinder and slidably fitted onto the outside of the connecting pipe to separate the upper oil outlet groove and the lower oil outlet groove on both sides; a collar is concentrically fixed at one end of the piston ring facing the bottom of the cylinder, the collar is slidably fitted onto the outside of the connecting pipe and covers the lower oil outlet groove, and a through hole is radially opened on the outer wall of the collar, the through hole being connected to the lower oil outlet groove.

[0014] Preferably, the lower oil outlet groove is an elongated groove extending along the axial direction of the connecting pipe, including a narrow section in the middle and wide sections on both sides of the narrow section, with each section interconnected. The diameter of the through hole is smaller than the length of the narrow section and the wide section but larger than their width. Under normal conditions, the through hole is connected to the wide section near the top of the cylinder. When ejected, it moves relative to the piston with the connecting pipe, and the through hole is aligned with the wide section, the narrow section and the wide section in sequence.

[0015] Preferably, the piston component further includes a connecting frame, which is annular and concentrically fixed to the end of the piston ring facing the top of the cylinder. The connecting frame includes multiple fixed rods arranged in an annular array and a fixed plate. The end of the telescopic rod inside the cylinder is fixedly connected to the fixed plate, and an oil passage gap is maintained between each fixed rod.

[0016] The present invention has the following advantages: (1) Compared with the above-mentioned background technology, the window sealing strip forming device provided by the present invention sets a hydraulic damping flexible transmission unit between the lower top plate and the upper top plate, which converts the rigid displacement input of the injection molding machine ejector rod acting on the lower top plate into a force output whose magnitude changes automatically with the ejection stroke. This allows the ejector pin to flexibly fit the product with a small thrust in the initial stage and slowly build up force, avoiding stress concentration caused by a sudden large thrust while the product is still fully fitted with the cavity, which could lead to whitening, punching, indentation, or tearing. In the middle stage, the output force is significantly increased by throttling and pressure buildup, which is sufficient to overcome the clamping peak and static friction resistance, ensuring reliable demolding without residue. In the final stage, the pressure buildup is released and the ejection force and speed drop synchronously, preventing the product from being ejected or flying away due to a sudden decrease in resistance, and facilitating stable material handling. Thus, without introducing electric drive components, sensors, or electronic control programs, the contact between the moving mold and the injection molding machine ejector rod during mold opening can achieve adaptive matching of the staged changes in ejection force and demolding resistance, taking into account both demolding reliability and product protection.

[0017] (2) Compared with the above background technology, the window sealing strip forming device provided by the present invention positions the upper top plate by setting a limiting plate and setting a reset spring between the limiting plate and the lower top plate, so that the reset process is decomposed into two independent paths. That is, the lower top plate is driven to reset by the reset spring, while the upper top plate and the ejector pin are slowly driven to reset by the oil damping generated when the piston moves relative to the cylinder. Since the upper top plate can sit directly and abut against the limiting plate under normal conditions to obtain a certain initial height, the end face of the ejector pin is accurately kept flush with the forming surface of the moving mold core. Therefore, there is no need to configure a spring with a large elastic force at the upper top plate to overcome the oil damping. This avoids the problem that the large elastic spring is superimposed on the load as an additional resistance during the ejection process, and changes the cylinder pressure, piston ring follow-up speed and the timing of each segment switching due to its fatigue decay and the change of elastic force with the degree of compression. The ejection force is determined only by the flow area and damping characteristics, which significantly improves the control accuracy and repeatability of segment ejection. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the ejector assembly structure of the present invention; Figure 3 This is a side view of the mold structure of the present invention; Figure 4 This is a schematic diagram of the internal structure of the cylinder block of the present invention; Figure 5 This is an exploded structural diagram of the connecting pipe and piston component of the present invention; Figure 6 This is a schematic diagram showing the initial positional relationship between the through hole and the lower oil outlet groove in this invention. Figure 7 This is a schematic diagram showing the positional relationship between the through hole and the lower oil outlet groove in the middle section of the present invention. Figure 8 This is a top view schematic diagram showing the positional relationship between the through hole and the lower oil outlet groove in the force-enhancing stage of the present invention; Figure 9 This is a top view schematic diagram showing the positional relationship between the through hole and the lower oil outlet groove in the gentle stage of the present invention.

[0020] In the diagram: 1. Fixed mold; 2. Moving mold; 3. Sprue bushing; 4. Ejector assembly; 5. Ejector pin; 6. Guide pillar; 7. Guide sleeve; 8. Bottom cover; 9. End cover; 10. Upper oil outlet groove; 11. Lower oil outlet groove; 101. Fixed mold base plate; 102. Fixed mold plate; 201. Moving mold plate; 202. Spacer block; 203. Moving mold base plate; 401. Lower ejector plate; 402. Segmented control component; 403. Upper ejector plate; 404. Return spring; 405. Limiting plate; 4021. Cylinder body; 4022. Piston component; 4023. Telescopic rod; 4024. Connecting pipe; 4221. Piston ring; 4222. Connecting frame; 4223. Collar; 4224. Through hole; 4201. Fixing rod; 4202. Fixing plate; 1101. Wide opening section; 1102. Narrow opening section. Detailed Implementation

[0021] 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.

[0022] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] This invention provides a window sealing strip forming device, which achieves adaptive switching of ejection force with stroke, from gentle to strong and then gentle, through a hydraulic damping unit, and eliminates spring interference by decoupling through a reset path. Under pure mechanical drive, it balances reliable demolding, product protection, and control precision. It can also solve the problems of high demolding resistance of sealing strips, and the existing uniform speed ejection without segmented control, which easily causes product damage, retention, or flying material, and makes it difficult to balance demolding reliability and product protection.

[0024] Please refer to Figure 1 The present invention provides a window sealing strip forming device, comprising a fixed mold 1 and a movable mold 2 disposed opposite to the fixed mold 1. The fixed mold 1 is composed of a fixed mold base plate 101, a fixed template 102, and a fixed mold core embedded in the fixed template 102. The fixed mold base plate 101 is provided with a sprue sleeve 3 connected to the injection nozzle. The sprue sleeve 3 is connected to the molding cavity via a main runner and a branch runner formed on the fixed template 102. The movable mold 2 is composed of a movable template 201, a movable mold core embedded in the movable template 201, a pad block 202 disposed below the movable template 201, and a movable mold base plate 203. The fixed mold core and the movable mold core together form a molding cavity adapted to the shape of the window sealing strip when the mold is closed.

[0025] When the mold is closed, the moving mold 2 moves toward and locks the fixed mold 1 under the drive of the injection molding machine. The molten material is injected into the molding cavity through the sprue sleeve 3, the main runner and the branch runner in sequence. After the material has cooled and solidified in the molding cavity, the moving mold 2 moves away from the fixed mold 1 under the drive of the injection molding machine to open the mold. The molded sealing strip product is separated from the fixed mold core along with the moving mold 2, thus completing a complete injection molding cycle.

[0026] To achieve automatic demolding of the product, the moving mold 2 is equipped with an ejection assembly 4 for ejecting the molded sealing strip product from the moving mold core. The ejection assembly 4 is reciprocally positioned between the moving mold plate 201 and the moving mold base plate 203 in the mold opening and closing direction. The ejection assembly 4 is positioned at the pad 202 below the moving mold plate 201. Specifically, two pads 202 are fixed on both sides of the lower part of the moving mold plate 201, and a space is reserved between the two pads 202. The moving mold base plate 203 is fixed below the pads 202, and the ejection assembly 4 is movably positioned in this space in the mold opening and closing direction. Several ejector pins 5 are also installed above the ejector assembly 4. The other end of the ejector pin 5 passes through the moving mold plate 201 and the moving mold core along the demolding direction and extends into the edge of the molding cavity. Its end face is flush with the molding surface of the moving mold core to ensure the integrity of the molding surface. The moving mold base plate 203 is provided with an ejection hole for the injection molding machine ejector rod to pass through. The ejector rod of the injection molding machine can pass through the ejection hole and push against the rear end face of the ejector assembly 4, thereby driving the ejector assembly 4 together with the ejector pins 5 on it to move forward synchronously along the demolding direction. The ejector pins 5 smoothly eject the sealing strip product covering the moving mold core.

[0027] An ejector guide post 6 and an ejector guide sleeve 7 are also provided between the moving template 201 and the moving mold base plate 203 to guide the movement of the ejector assembly 4. The ejector guide post 6 passes through the ejector assembly 4, and its two ends are fixed to the moving template 201 and the moving mold base plate 203 respectively. The ejector guide sleeve 7 is provided at the position where the ejector guide post 6 passes through the ejector assembly 4. The ejector guide sleeve 7 is fixedly installed on the ejector assembly 4. The two work together to ensure the smoothness and positional accuracy of the reciprocating movement of the ejector assembly 4.

[0028] During injection molding, after the molten material has cooled and solidified sufficiently in the molding cavity, the injection molding machine moves the moving mold 2 away from the fixed mold 1 to open the mold. The molded sealing strip product detaches from the fixed mold core along with the moving mold 2 and remains covered on the molding surface of the moving mold core. When the moving mold 2 moves to the set position with the injection molding machine, the ejector rod of the injection molding machine passes through the ejection hole on the moving mold base plate 203 and abuts against the rear end face of the ejector assembly 4. As the moving mold 2 continues to move, the ejector rod applies a pushing force to the ejector assembly 4, pushing the ejector assembly 4 forward in the demolding direction. Then, the ejector assembly 4 drives each ejector pin 5 on it to move synchronously, so that the end faces of each ejector pin 5 work together on the product, smoothly and evenly ejecting the sealing strip product covered on the moving mold core from the molding surface. Subsequently, the ejector rod of the injection molding machine retracts, and the ejector assembly 4 returns to the initial position under the action of the spring. The mold closes again and enters the next molding cycle.

[0029] However, in the actual ejection process, since the window sealing strip itself is a slender, thin-walled and flexible irregular product, its contact area with the molding cavity after molding is large and its bonding length is long. In addition, the shrinkage and tightening effect caused by the cooling and shrinkage of the material, as well as the negative pressure adsorption effect that is easily formed between the cavity and the product, make the product exert a large clamping force on the moving mold core, and the demolding resistance is significantly increased. Moreover, this resistance is not constant throughout the entire ejection stroke, but shows obvious stage changes with the degree of product separation.

[0030] Specifically, in the initial stage of ejection, the product is still fully fitted to the cavity and completely constrained, making it almost impossible to release stress through its own deformation. If the ejector pin is directly lifted with a large thrust at this time, the thrust will be concentrated on the local contact area between the ejector pin 5 end face and the product, forming a significant stress concentration. This can easily cause damage such as whitening, perforation, indentation, local tensile deformation, or even tearing at the point of action of the ejector pin 5. This is especially sensitive for thin-walled parts, corner parts, and surfaces with high appearance requirements. Conversely, if the ejection pressure is reduced in an attempt to avoid the above damage, the ejection force will be unable to overcome the peak clamping force and static friction resistance between the product and the cavity, resulting in situations where the product cannot be ejected, cannot be ejected, or remains partially inside the cavity. This leads to production interruption, the need for manual intervention to clean up, and seriously affects the molding cycle and product consistency. In the final stage of ejection, the situation is exactly the opposite: as the product gradually changes from being completely attached to the mold cavity to partially detaching and even being basically demolded, the actual contact area and clamping force between the product and the cavity decrease rapidly, and the demolding resistance drops significantly. If the ejector pin continues to push forward with the original thrust and speed, the product will gain a sudden increase in acceleration at the moment the resistance decreases sharply, and will be suddenly ejected or even fly away from the moving mold core at the end of the stroke. This will cause uncertainty in the drop position, products to stack and collide with each other, surface scratches or contamination, and will also make it difficult for the robot to grasp the product stably or for manual material handling. It is difficult to adapt to automated part handling and subsequent online inspection, fixed-length cutting and other processes.

[0031] Existing ejection technologies generally rely on the contact between the moving mold 2's own mold opening displacement and the injection molding machine's ejector pin to achieve drive. That is, the injection molding machine's mold opening action itself serves as the ejection power source, eliminating the need for additional hydraulic cylinders, pneumatic cylinders, or electric drive components. This approach has significant advantages such as simple structure, low cost, natural synchronization of action and mold opening cycle, and fewer potential failure points. However, because the ejector pin is directly and rigidly driven by the movement of the moving mold 2, its ejection speed and thrust are basically determined by the mold opening displacement and speed. Throughout the ejection stroke, it exhibits an approximately constant thrust and an approximately uniform ejection speed. It cannot adaptively adjust the ejection force and ejection speed according to the stage-wise changes in demolding resistance. Therefore, it is always difficult to simultaneously meet the contradictory requirements of needing a sufficiently large ejection force to overcome the clamping peak during mold opening and a sufficiently small ejection force to protect the product and prevent material spillage at the moment of mold opening and the final stage of demolding. As a result, the aforementioned problems of product damage, insufficient ejection force, and material spillage at the final stage have persisted for a long time.

[0032] Therefore, in this embodiment, the ejector assembly 4 is configured as a segmented ejector structure, while still retaining the purely mechanical drive method that relies on the opening and movement of the moving mold 2 to contact the injection molding machine ejector pin, without introducing any additional power components. Please refer to... Figure 1 and Figure 2 Specifically, the ejection assembly 4 includes a lower ejector plate 401, a segmented control component 402, and an upper ejector plate 403. The lower ejector plate 401 is used to directly contact the ejector rod of the injection molding machine and receive its pushing force. The upper ejector plate 403 is used to install the ejector pin 5 and drive the ejector pin 5 to move. The segmented control component 402 is set between the lower ejector plate 401 and the upper ejector plate 403. It is used to convert and transmit the lateral pushing force generated by the moving mold 2 after it opens and contacts the ejector rod, so that the upper ejector plate 403 ejects with different pushing forces in different ejection stroke ranges, thereby realizing the segmented ejection effect of the ejector rod on the product: initial gentle ejection, middle pressure ejection, and final gentle ejection.

[0033] In the initial ejection stage, a small thrust and slow speed are used to allow the ejector pin 5 end face to flexibly conform to the product surface and slowly build up ejection force. This ensures uniform force on the product and gradually overcomes the clamping peak and static friction resistance, avoiding stress concentration and product damage caused by sudden large thrust. In the middle ejection stage, the product has loosened and the clamping force has significantly decreased. At this point, the thrust is increased to reliably and quickly detach the product from the molding surface, ensuring a high demolding success rate and molding cycle time. In the final ejection stage, the product has been largely demolded and the residual clamping force is very small. At this point, the thrust is reduced again to prevent the product from being ejected or flying away due to a sudden decrease in demolding resistance. The product remains gently above the moving mold core, facilitating stable material handling by a robot or manual operator. Thus, without adding electric drive components and maintaining a compact structure and synchronized operation, this method effectively balances demolding reliability and product protection, solving problems such as product damage, insufficient ejection force, and material flying at the end stage caused by uniform ejection in existing technologies.

[0034] For details, please refer to Figure 1 , Figure 2 as well as Figure 3 The lower top plate 401 and the upper top plate 403 are both movably arranged in the space reserved between the two pads 202 along the stripping direction of the product. The lower top plate 401 is located below the upper top plate 403, and the lower end of the ejector pin 5 is fixedly installed on the upper top plate 403. The segment control component 402 is arranged between the lower top plate 401 and the upper top plate 403, thereby forming a flexible transmission link between the power input end and the execution output end.

[0035] To ensure that each component has a definite and repeatable initial position under normal conditions, several return springs 404 are arranged in an array above the lower top plate 401. The return springs 404 are distributed in an array along the plate surface to ensure that the elastic force on the lower top plate 401 is uniform and to avoid uneven loading and tilting. Limiting plates 405 are fixed on the opposing surfaces of the two side pads 202 respectively. Under normal conditions, the upper top plate 403 directly abuts against and sits on the limiting plate 405. The limiting plate 405 limits the height position of the upper top plate 403, so that the end face of the ejector pin 5 is accurately kept at the normal height position flush with the forming surface of the moving mold core.

[0036] The reset spring 404 is located below the limiting plate 405 and between the lower top plate 401. Its two ends abut against the limiting plate 405 and the lower top plate 401 respectively. The lower top plate 401 is elastically limited by the downward force of the spring, so that the lower top plate 401 is normally kept at the lower limit position. When the moving mold 2 opens, the moving mold 2 continues to move with the injection molding machine. The ejector pin of the injection molding machine passes through the ejection hole on the moving mold base plate 203 and abuts against the rear end face of the lower ejector plate 401. As the moving mold 2 continues to move, the ejector pin pushes the lower ejector plate 401 upward and compresses the return spring 404 at the same time. The lower ejector plate 401 then drives the upper ejector plate 403 to move upward through the segmented control component 402. The upper ejector plate 403 drives each ejector pin 5 on it to move forward in the demolding direction to achieve ejection. After ejection is completed, the ejector pin of the injection molding machine retracts, and the lower ejector plate 401 returns to the lower limit under the elastic force of the return spring 404. The ejector pins 5 are passively retracted during the mold closing process and drive the upper ejector plate 403 to fall back to the initial height abutting against the limit plate 405, thus returning to the standby state in a purely mechanical way and entering the next cycle.

[0037] Please refer to Figures 2-4 The segmented control component 402 includes a cylinder body 4021, a piston 4022, a telescopic rod 4023, and a connecting pipe 4024. A bottom cover 8 is threaded onto one end of the cylinder body 4021, sealing the bottom of the cylinder body 4021. The bottom end of the cylinder body 4021 is fixedly connected to the lower top plate 401, and the entire cylinder body 4021 is located between the lower top plate 401 and the upper top plate 403, allowing it to rise and fall synchronously with the lower top plate 401. The cylinder body 4021 has an internal sliding seal with a piston 4022. A telescopic rod 4023 is connected above the piston 4022. The top of the telescopic rod 4023 extends through the opening at the top of the cylinder body 4021 to the outside of the cylinder body 4021. The telescopic rod 4023 and the opening at the top of the cylinder body 4021 are slidably sealed by the end cap 9 and the sealing element. This ensures that the telescopic rod 4023 can extend and retract freely while effectively preventing oil leakage and preventing external impurities from entering the cylinder body 4021. The end of the telescopic rod 4023 outside the cylinder body 4021 is fixedly connected to the upper top plate 403, thereby directly transmitting the movement of the piston 4022 to the ejector pin 5.

[0038] More importantly, a connecting pipe 4024 is installed inside the cylinder 4021. This connecting pipe 4024 is used to generate different magnitudes of damping force when the piston 4022 moves up and down, thereby adjusting the movement force of the upper ejector plate 403. Thus, the segmented control component 402 essentially constitutes a hydraulic damping flexible transmission unit built into the mold ejector plate accommodating space: it uses the oil in the cylinder 4021 as the force transmission medium, converting the rigid displacement input obtained by the lower ejector plate 401 from the injection molding machine ejector rod into a force output whose magnitude can be automatically adjusted with the stroke. The oil circulates in a closed loop inside the cylinder 4021, without the need for an external oil source, pipeline or oil tank. Therefore, it can achieve flexible adjustment of ejection force and ejection speed without introducing any electric drive components or occupying additional installation space. At the same time, the hydraulic medium itself also has a good buffering and vibration absorption effect, which can absorb the impact and vibration during the mold opening process, making the entire ejection action smooth and low noise.

[0039] Please refer to Figures 2-5 Even the connecting pipe 4024 is concentrically located inside the cylinder body 4021, and its bottom end is fixedly connected to the inner wall of the bottom cover 8 of the cylinder body 4021. The axial direction of the connecting pipe 4024 corresponds to the axial direction of the cylinder body 4021 to maintain coaxiality, and both ends of the connecting pipe 4024 are closed. A lower oil outlet groove 11 and an upper oil outlet groove 10 are respectively radially penetrated on the outer circumferential outer wall of both ends of the connecting pipe 4024. The lower oil outlet groove 11 is opened on a section of the outer wall of the connecting pipe 4024 near the bottom of the cylinder body 4021, and the upper oil outlet groove 10 is opened on a section of the outer wall near the top of the cylinder body 4021. Because both ends of the connecting pipe 4024 are closed, the oil in the cylinder 4021 can only enter the inner cavity of the connecting pipe 4024 through the lower oil outlet groove 11 and then be discharged through the upper oil outlet groove 10, thus forming a unique and definite oil flow channel, making the flow of the oil completely controlled, which is conducive to obtaining stable and predictable damping characteristics. At the same time, since the flow cross section of the upper oil outlet groove 10 is larger than the flow cross section of each section of the lower oil outlet groove 11, it does not constitute a throttling bottleneck in the oil circuit. The throttling effect is almost entirely determined by the lower oil outlet groove 11, thus concentrating the design variables of the damping characteristics and clarifying the adjustment relationship, making it easy to accurately control the output force of each section through groove design.

[0040] Furthermore, the connecting pipe 4024 is concentric with the cylinder 4021 and moves synchronously with the cylinder 4021, so that the position of the connecting pipe 4024 relative to the piston 4022 corresponds to the ejection stroke position, that is, the stroke position is segmented control: different strokes are automatically matched with different flow areas and different damping forces, and no sensor detection or electrical control is required throughout the process, so the operation is reliable and the anti-interference ability is strong. Moreover, when it is necessary to adapt to sealing strip products with different cross-sectional shapes, different lengths or different materials, it is only necessary to replace the connecting pipe 4024 with different groove widths or lengths to change the force value and stroke range of each segment, which is simple to adjust and has good versatility.

[0041] The piston component 4022 includes a piston ring 4221 and a connecting bracket 4222. The piston ring 4221 is slidably disposed inside the cylinder body 4021. The outer circumference of the piston ring 4221 and the inner wall of the cylinder body 4021 are slidably sealed by a sealing element. At the same time, the piston ring 4221 is sleeved on the outside of the connecting pipe 4024, and is also slidably sealed on the outside of the connecting pipe 4024 by a sealing element, i.e., a sealing ring. This forms a double seal to ensure that the oil does not leak internally at the piston ring 4221 and to ensure the stable establishment of the damping force.

[0042] The upper oil outlet groove 10 and lower oil outlet groove 11 at both ends of the connecting pipe 4024 are located on both sides of the piston ring 4221. The piston ring 4221 not only separates the two oil outlet grooves from each other, but also divides the internal chamber of the cylinder 4021 into upper and lower chambers, so that the flow of oil must pass through the internal channel of the connecting pipe 4024 from the lower chamber to the upper chamber. A collar 4223 is concentrically fixed at one end of the piston ring 4221 facing the bottom of the cylinder 4021. The collar 4223 is also slidably sleeved on the outside of the connecting pipe 4024, and the collar 4223 covers the lower oil outlet groove 11 at one end of the connecting pipe 4024. A through hole 4224 is radially opened on the outer wall of the collar 4223. The through hole 4224 is connected to the lower oil outlet groove 11, thus forming the only inlet for the oil in the lower chamber to enter the connecting pipe 4024.

[0043] Specifically, the lower oil outlet groove 11 is configured as an elongated groove extending axially along the connecting pipe 4024, and is divided into three sections of different widths. Please refer to [reference needed]. Figures 3-4Specifically, it includes a narrow section 1102 and a wide section 1101. The narrow section 1102 is located in the middle, and the wide sections 1101 are respectively located on both sides of the narrow section 1102. The sections are interconnected to form a segmented elongated groove with different widths. The diameter of the through hole 4224 is smaller than the length of the narrow section 1102 and the wide section 1101, so as to ensure that the through hole 4224 is aligned with only one of the sections at any time. The diameter of the through hole 4224 is larger than the width of the narrow section 1102 and the wide section 1101, so as to ensure that the through hole 4224 can completely cover the width direction of the groove. The actual effective flow area is uniquely determined by the width of the groove section where the through hole 4224 is located, resulting in a clear throttling relationship and high repeatability.

[0044] Under normal conditions, the through hole 4224 on the piston ring 4221 is connected to the wide opening 1101 near the top of the cylinder 4021. During operation, when the lower top plate 401 is acted upon by the injection molding machine push rod, the lower top plate 401 drives the cylinder 4021 to move upward synchronously. The volume of the lower chamber below the piston ring 4221 in the cylinder 4021 decreases accordingly. The oil inside is pressurized and passes through the hole 4224 and the lower oil outlet groove 11 into the inner cavity of the connecting pipe 4024, and then is discharged through the upper oil outlet groove 10 to the upper... The chamber; at the same time, due to the relative lag of piston ring 4221 and collar 4223 caused by the restraint of upper top plate 403, ejector pin 5 and product clamping resistance, the upward movement of cylinder 4021 is converted into the movement of connecting pipe 4024 relative to piston ring 4221 and collar 4223, thereby automatically switching the connection position of lower oil outlet groove 11 and through hole 4224, so that the actual cross-sectional area of ​​oil passage changes in sequence according to the order of wide opening section 1101, narrow opening section 1102, and wide opening section 1101. Therefore, the oil flow area in the lower chamber of cylinder 4021 varies from large to small to large: when in the wide-mouth section 1101, the oil discharge is smooth and the throttling effect is weak, making it difficult to build high pressure in the lower chamber. The hydraulic pressure transmitted to the piston ring 4221 is relatively small, and the piston ring 4221, along with the telescopic rod 4023 and the upper top plate 403, moves with only a small force and a slow speed, resulting in loose damping and gentle output force. When switching to the narrow-mouth section 1102 in the middle, the oil discharge is obstructed and the throttling effect is weak. The flow effect is significantly enhanced, the oil pressure in the lower chamber increases, and the high pressure acts on the lower end face of the piston ring 4221 and pushes it upward, significantly increasing the thrust transmitted to the telescopic rod 4023. The piston ring 4221 moves upward almost synchronously with the cylinder block 4021, resulting in tighter damping and increased output force. When it passes through the narrow opening section 1102 and re-enters the wide opening section 1101 at the other end, the flow area increases again, the throttling effect weakens, and the output force drops, with the action becoming gentle again. Correspondingly, the force exerted by the telescopic rod 4023 on the ejector pin 5 exhibits a changing pattern of gentle, increased force, and gentle again. Moreover, because the three grooves are interconnected and the flow area changes continuously rather than abruptly, the transition of force between each section is smooth and without impact, avoiding secondary impact at the moment of segment switching.

[0045] Please refer to Figures 6-9 In the demolding process: In the initial ejection stage, the ejector pin 5 is in the wide-mouth section 1101. The ejector pin 5 is flexibly attached to the surface of the product with a small force and slowly builds up the ejection force. This allows the thin-walled sealing strip to be evenly loaded along its length and gradually accumulate demolding tendency, effectively avoiding whitening, puncture, indentation or tearing caused by stress concentration at the point of action of the ejector pin 5 due to instantaneous large thrust. In the middle ejection stage, the ejector pin enters the narrow-mouth section 1102. The output force increases significantly, which is sufficient to overcome the clamping peak and static friction resistance between the product and the cavity, ensuring reliable demolding without residue and maintaining a stable molding cycle. In the final ejection stage, the ejector pin returns to the wide-mouth section 1101. At this time, the product has basically detached and the residual clamping force is very small. The output force and ejection speed drop synchronously and the upper ejector plate 403 naturally converges and decelerates. The product is gently pushed to the picking position without being ejected or flying away due to the sudden reduction of resistance. This facilitates stable gripping by the robot or manual picking, and also avoids collisions and scratches between products.

[0046] Please refer to Figures 4-5 Specifically, regarding the connecting bracket 4222, an annular connecting bracket 4222 is concentrically fixed at the end of the piston ring 4221 facing the top of the cylinder 4021. This connecting bracket 4222 consists of multiple fixed rods 4201 arranged in a circular array and a fixed plate 4202. The end of the telescopic rod 4023 inside the cylinder 4021 is fixedly connected to the fixed plate 4202. An oil passage gap is maintained between the fixed rods 4201 in the annular array, allowing the oil in the upper chamber to flow freely around the telescopic rod 4023, preventing obstruction of the oil passage or oil trapping due to the connecting bracket 4222. In summary, the segmented control unit 402, with its compact combination of cylinder 4021, piston 4022, telescopic rod 4023, and connecting pipe 4024, constructs a purely mechanical hydraulic transmission unit that can automatically switch the damping magnitude according to the stroke position. Its power still comes entirely from the contact between the moving mold 2 and the injection molding machine ejector rod when the mold opens, without the need for additional hydraulic cylinders, air cylinders, motors, or other electrically driven components, nor the need for sensors and electronic control programs. Its adjustment is automatically completed by the relative positional changes of the three-section oil outlet groove (wide, narrow, and wide) on the connecting pipe 4024 and the through hole 4224 of the collar 4223, directly mapping the ejection stroke position to the flow area and damping force. This achieves segmented ejection of the product by the ejector pin 5, with gentle initial ejection, increased force in the middle, and gentle final ejection, taking into account both the reliability of demolding and the protection of the product. It also has the comprehensive effects of compact structure, smooth operation, buffering and vibration absorption, good adjustability, and maintenance-free operation.

[0047] It should be noted that by setting the limiting plate 405 and placing the return spring 404 between the lower top plate 401 and the limiting plate 405, the piston 4022 inside the cylinder 4021 can be reset by the return spring 404, that is, reset by the movement of the lower top plate 401. The lower top plate 401 compresses the return spring 404 by the movement of the moving mold 2. In other words, by setting the limiting plate 405, the return spring 404 does not need to be placed at the upper top plate 403, thus avoiding the problem of placing a return spring 404 with excessive elasticity at the upper top plate 403. This would prevent the cylinder 4021 from moving and the ejector pin 5 from being ejected by the hydraulic damping force. A spring with excessive elasticity would affect the segmented force control accuracy of the ejector pin 5 because of the fatigue of the spring and the change in its elasticity as the compression progresses. That is, when the upper top plate 403 moves upward under the action of hydraulic damping force... During ejection, as the spring is continuously compressed, the ejection resistance of the upper top plate 403, i.e., the ejector pin 5, gradually increases, which will affect the segmentation effect of the oil outlet groove. In this embodiment, by setting the limiting plate 405, the piston 4022 can be reset by the spring force of the reset spring 404 of the lower top plate 401 when ejection is completed, while the ejector pin 5 is reset by the damping force generated by the piston ring 4221 moving inside the cylinder 4021. Thus, there is no need to set a spring above the upper top plate 403 for reset, which makes the segmentation control accuracy of the ejector pin 5 of the upper top plate 403 higher. In addition, a spring with a small spring force can be set above the upper top plate 403 to ensure that the position of the upper top plate 403 is normal, without considering the reset of the piston 4022 by the spring, thus avoiding the reset by the upper top plate 403. In order to overcome the damping force, a spring with a larger spring force is used, so that the spring affects the segmentation control during ejection.

[0048] It should be noted that the reference Figure 2 and Figure 3In this embodiment, by adding a limiting plate 405 and placing a reset spring 404 between the lower top plate 401 and the limiting plate 405, the action of the reset spring 404 is shifted from the upper top plate 403 to the lower top plate 401. The reset of the piston 4022 and the ejector assembly 4 can thus be accomplished by the reset action of the lower top plate 401. The compressive force required by the lower top plate 401 comes from the contact and push of the moving mold 2 with the injection molding machine ejector rod when the mold opens. The key significance of this arrangement is that the limiting plate 405 allows the upper top plate 403 to sit directly on it under normal conditions and obtain a fixed initial height. Therefore, there is no need to set a reset spring at the upper top plate 403, nor is there a need to configure a spring with a large elastic force to overcome the damping force of the oil in the cylinder 4021. Otherwise, during the process of cylinder 4021 moving upward with lower top plate 401 and being driven by oil damping to push out upper top plate 403 and ejector pin 5, the spring will always be superimposed on the ejection load as an additional resistance. The spring is subject to fatigue decay, and its elastic force changes with the increase of compression. This will make the resistance experienced by ejector pin 5 during the stroke a variable that is constantly increasing. This will change the actual pressure level of cylinder 4021, the follow-up speed of piston ring 4221, and the switching timing of each segment, weakening the segmented effect of gentle initial stage, increased force in the middle stage, and gentle final stage, and reducing control accuracy and repeatability. In this embodiment, the reset process is broken down into two independent paths: the reset of the lower top plate 401 is accomplished by the elastic force of the reset spring 404, while the reset of the upper top plate 403 and the ejector pin 5 is achieved smoothly by the oil damping generated when the piston ring 4221 moves relative to the cylinder 4021. This ensures that the ejection force of the upper top plate 403 and the ejector pin 5 is determined only by the flow area and damping characteristics of the oil in the cylinder 4021, significantly improving the segmented control accuracy. Furthermore, to improve normal stability, a spring with a small elastic force can still be installed above the upper top plate 403. Its function is limited to ensuring that the upper top plate 403 is in contact with the limiting plate 405 and maintaining the initial position where the end face of the ejector pin 5 is flush with the molding surface. Because its elastic force is very small, the additional resistance and its changes during the ejection process are negligible and will not have a substantial impact on the segmented control.

[0049] In this embodiment, when the mold is closed, the fixed mold core and the moving mold core form a molding cavity that matches the shape of the window sealing strip. The molten material is injected into the cavity sequentially through the sprue sleeve 3, the main runner and the branch runner. After the material cools and solidifies, the injection molding machine drives the moving mold 2 to open the mold. The product is separated from the fixed mold core along with the moving mold 2 and remains covered on the molding surface of the moving mold core. The moving mold 2 continues to move to the set position. The injection molding machine ejector rod passes through the ejection hole and abuts against the rear end face of the lower ejector plate 401, pushing the lower ejector plate 401 to move upward against the elastic force of the return spring 404. The cylinder 4021, which is fixed to the lower ejector plate 401, moves upward synchronously. The piston 4022 is relatively lagging behind due to the restraint of the upper ejector plate 403, the ejector pin 5, and the product clamping resistance, which reduces the volume of the lower chamber of the cylinder 4021. After the oil is pressurized, it flows into the upper chamber through the through hole 4224 on the collar 4223, the lower oil outlet groove 11, the inner cavity of the connecting pipe 4024, and the upper oil outlet groove 10. When it flows through the throttling orifice formed by the through hole 4224 and the lower oil outlet groove 11, it generates damping. This damping force pushes the piston ring 4221 and is transmitted to the upper ejector plate 403 through the connecting frame 4222 and the telescopic rod 4023. The product is ejected by the ejector pin 5. Simultaneously, the connecting pipe 4024 moves upward synchronously with the cylinder body 4021 and moves axially relative to the through hole 4224, automatically switching the connection position between the through hole 4224 and each section of the lower oil outlet groove 11. This causes the flow area to change sequentially in the order of wide-mouth section 1101, narrow-mouth section 1102, and wide-mouth section 1101, thus directly mapping the ejection stroke position to different ejection forces: the initial stage is in the wide-mouth section 1101, with a large flow area and weak throttling. The ejector pin 5 gently adheres to the product surface with a small thrust and slowly builds up the ejection force, avoiding the instantaneous large thrust at the point of action of the ejector pin 5. Stress concentration at the top can cause whitening, perforation, indentation, or tearing. In the middle section, the flow area decreases and throttling is enhanced. The pressure in the lower chamber increases and the piston ring 4221 is pushed forcefully, increasing the ejection force. This force is sufficient to overcome the clamping peak and static friction resistance between the product and the cavity, allowing the product to reliably detach from the molding surface. In the final section, the flow area increases and the pressure is released. The ejection force and ejection speed drop synchronously, and the product is gently pushed to the pick-up position without being ejected or flying away due to the sudden reduction in resistance. This facilitates pick-up and avoids bumps and scratches. After ejection is completed, the ejector rod retracts, and the lower ejector plate 401 drives the cylinder 4021 to return to the lower limit under the action of the return spring 404. The upper ejector plate 403 and the ejector pin 5 then fall back smoothly due to the oil damping generated by the relative movement of the piston ring 4221 in the cylinder 4021, until the upper ejector plate 403 abuts against the limit plate 405 and the end face of the ejector pin 5 returns to the initial height flush with the molding surface.

[0050] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0051] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make several improvements and modifications to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the present invention.

Claims

1. A window sealing strip forming device, comprising a fixed mold (1) and a movable mold (2) disposed opposite thereto, wherein the movable mold (2) comprises a movable template (201), and the fixed mold (1) and the movable mold (2) are closed to form a forming cavity adapted to the shape of the window sealing strip; The moving mold (2) is provided with an ejector assembly (4), which reciprocates along the mold opening and closing direction and is equipped with an ejector pin (5). The ejector pin (5) penetrates the moving template (201) and the moving mold core, and its end face is flush with the forming surface of the moving mold core. The characteristic of this design is that... The ejection assembly (4) includes a lower top plate (401), an upper top plate (403), and a segmented control component (402) disposed between the lower top plate (401) and the upper top plate (403). The lower top plate (401) is used to abut against the ejector rod of the injection machine, and the upper top plate (403) is used to mount the ejector pin (5). The segmented control component (402) converts the pushing force on the lower top plate (401) into different ejection forces on the upper top plate (403) in different ejection stroke ranges, and makes the ejection force change in segments of small, large and small in the ejection stroke, so that the ejector pin (5) forms a segmented ejection of the product with a gentle initial stage, a stronger middle stage and a gentle final stage.

2. The window sealing strip forming device according to claim 1, characterized in that, The segmented control component (402) includes a cylinder (4021), a piston (4022), a telescopic rod (4023), and a connecting pipe (4024). The cylinder (4021) is fixed to the lower top plate (401) and moves with it. The piston (4022) is slidably sealed inside the cylinder (4021) and divides the inner cavity of the cylinder (4021) into upper and lower chambers. One end of the telescopic rod (4023) is connected to the piston (4022), and the other end extends out of the top of the cylinder (4021) and is fixed to the upper top plate (403). The connecting pipe (4024) is located inside the cylinder (4021) and is closed at both ends. A lower oil outlet groove (11) and an upper oil outlet groove (10) are provided through its outer wall. After being pressurized, the oil in the lower chamber is discharged into the upper chamber through the lower oil outlet groove (11), the inner cavity of the connecting pipe (4024) and the upper oil outlet groove (10). When the connecting pipe (4024) moves with the cylinder (4021) relative to the piston (4022), the effective flow area of ​​the lower oil outlet groove (11) changes in segments of large, small and large, so that the ejector pin (5) ejects the product in segments of gentle initial stage, strong middle stage and gentle final stage.

3. The window sealing strip forming device according to claim 1, characterized in that, The moving mold (2) also includes pads (202) on both sides below the moving template (201), with a reserved space between the two pads (202); the lower top plate (401) and the upper top plate (403) are both movably arranged in the reserved space along the stripping direction, and the lower top plate (401) is located below the upper top plate (403), and the lower end of the ejector pin (5) is fixedly installed on the upper top plate (403).

4. The window sealing strip forming device according to claim 3, characterized in that, Limiting plates (405) are fixed on the opposing surfaces of the two pads (202). Under normal conditions, the upper top plate (403) abuts against and sits on the limiting plate (405), and the height position of the upper top plate (403) is limited by the limiting plate (405).

5. The window sealing strip forming device according to claim 4, characterized in that, A plurality of reset springs (404) are arranged in an array above the lower top plate (401). The reset springs (404) are located between the limiting plate (405) and the lower top plate (401) and their two ends abut against the limiting plate (405) and the lower top plate (401) respectively, so that the lower top plate (401) is normally kept at the lower limit position. No reset springs (404) are provided above the upper top plate (403), or only pre-tightening springs with elastic force less than that of the reset springs (404) and insufficient to affect the segmented ejection control are provided.

6. The window sealing strip forming device according to claim 2, characterized in that, One end of the cylinder (4021) is threaded with a bottom cover (8), which seals the bottom of the cylinder (4021); the telescopic rod (4023) and the top opening of the cylinder (4021) are slidably sealed together by an end cover (9) and a seal.

7. The window sealing strip forming device according to claim 6, characterized in that, The connecting pipe (4024) is concentrically arranged inside the cylinder body (4021), and its bottom end is connected to the inner wall of the bottom cover (8). The lower oil outlet groove (11) is opened on the outer wall of the connecting pipe (4024) near the bottom of the cylinder body (4021). The upper oil outlet groove (10) is opened on the outer wall of the connecting pipe (4024) near the top of the cylinder body (4021). The flow cross section of the upper oil outlet groove (10) is larger than that of the lower oil outlet groove (11). By replacing the connecting pipe (4024) with different groove widths or lengths, the output force value and stroke range of each segment can be adjusted.

8. The window sealing strip forming device according to claim 7, characterized in that, The piston component (4022) includes a piston ring (4221), which is slidably sealed inside the cylinder body (4021) and slidably sealed outside the connecting pipe (4024) to separate the upper oil outlet groove (10) and the lower oil outlet groove (11) on both sides. The piston ring (4221) is concentrically fixed with a collar (4223) at one end facing the bottom of the cylinder (4021). The collar (4223) is slidably sleeved on the outside of the connecting pipe (4024) and covers the lower oil outlet groove (11). A through hole (4224) is radially opened on the outer wall of the collar (4223), and the through hole (4224) is connected to the lower oil outlet groove (11).

9. A window sealing strip forming device according to claim 8, characterized in that, The lower oil outlet groove (11) is a long strip-shaped groove extending along the axial direction of the connecting pipe (4024), including a narrow section (1102) located in the middle and a wide section (1101) located on both sides of the narrow section (1102), and the sections are interconnected. The diameter of the through hole (4224) is smaller than the length of the narrow section (1102) and the wide section (1101) and larger than their width. Under normal conditions, the through hole (4224) is connected to the wide section (1101) near the top of the cylinder (4021). When ejected, it moves relative to the piston (4022) with the connecting pipe (4024). The through hole (4224) is aligned with the wide section (1101), the narrow section (1102) and the wide section (1101) in sequence.

10. A window sealing strip forming device according to claim 8, characterized in that, The piston component (4022) also includes a connecting frame (4222), which is annular and concentrically fixed to one end of the piston ring (4221) facing the top of the cylinder (4021). It includes a plurality of fixed rods (4201) arranged in an annular array and a fixed plate (4202). The end of the telescopic rod (4023) inside the cylinder (4021) is fixedly connected to the fixed plate (4202), and an oil passage gap is maintained between each fixed rod (4201).

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