A straight top core-pulling demolding device and a demolding method applied to an injection mold

Abstract

The application discloses a straight-ejecting core stripping device and stripping method applied to an injection mold, relates to the technical field of injection molds, and comprises a frame, a fixed mold is fixedly connected to the inner wall of the frame, two guide frames are fixedly connected to the bottom of the frame, movable molds are slidably connected to the inner walls of the two fixed molds, a stripping mechanism is arranged in the movable mold, a core stripping mechanism is arranged in the movable mold, a ejector pin mechanism is arranged in the movable mold, a motor is fixedly connected to the top of the movable mold, a bidirectional screw rod is fixedly connected to the output shaft of the motor through a shaft coupling, two groups of first fixed plates are threadedly connected to the bidirectional screw rod, each group has two first fixed plates, a first bevel gear is fixedly connected to the outer wall of the bidirectional screw rod, the bidirectional screw rod is driven to rotate by the motor, two groups of first fixed plates are driven to move away from each other, and the first fixed plates are separated from the surface of a product before the ejector pin ejects the product, so that the problem of excessive friction between the product and mold parts in the traditional stripping process is solved.

Description

Technical Field

[0001] This invention belongs to the field of injection mold technology, and in particular relates to a direct-lift core-pulling demolding device and demolding method for use in injection molds. Background Technology

[0002] Injection molding is one of the most important molding methods for plastic products, widely used in various fields such as automobiles, electronics, medical devices, and home appliances. In injection mold design, when a plastic product has a lateral concave-convex structure, the product cannot be directly ejected along the mold opening direction. A core-pulling mechanism must be set up to first pull out the lateral molding parts during or after mold opening, and then eject the product.

[0003] Patent CN217021335U discloses a transverse core-pulling and demolding device for injection molds, including a placement base. The upper surface of the placement base is provided with a plurality of slide rail grooves. A first molding template is provided above the placement base. A plurality of sliders are fixedly installed on the lower surface of the first molding template. The sliders correspond to the positions of the sliders and slide within the sliders. A first molding groove is provided on one side wall of the first molding template.

[0004] As shown above, this device, by setting a pushing block and a second hydraulic actuator, can complete the demolding of the molded part in the first molding groove through the cooperation of the pushing block and the second hydraulic actuator, thereby improving the demolding efficiency of the molded part. At the same time, it avoids scratching the molded part by directly pulling the molded part out of the mold by the robotic arm, thus playing a protective role for the molded part in the mold. However, this device requires multiple hydraulic actuators to drive different actions, which makes the control complex and costly, energy-intensive, and requires frequent maintenance, resulting in high production costs.

[0005] In existing technologies, after the product is molded, the ejector pin directly pushes the product to complete the demolding. However, during the demolding process, the product rubs against the inner cavity of the mold, which can easily leave defects such as white spots, scratches, or tears on the product surface, affecting the appearance quality and yield of the product. Therefore, we propose a direct-ejection core-pulling demolding device and demolding method for injection molds. Before the product is demolded, the cavity components on the upper and lower sides of the product can be moved to avoid excessive friction with the product. At the same time as the cavity components are moved, the core-pulling mechanism can be driven to run together, so that a single motor can achieve compound action, which is energy-saving and efficient. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides a direct-ejection core-pulling demolding device and demolding method for injection molds, thus solving the aforementioned problems.

[0007] To achieve the above objectives, the present invention is implemented through the following technical solution: a direct-ejection core-pulling demolding device and demolding method applied to injection molds, comprising a frame, a fixed mold fixedly connected to the inner wall of the frame, two guide frames fixedly connected to the bottom of the frame, a movable mold slidably connected to the inner walls of the two fixed molds, a demolding mechanism, a core-pulling mechanism, and an ejector pin mechanism inside the movable mold; A motor is fixedly connected to the top of the moving mold. The output shaft of the motor is fixedly connected to a bidirectional lead screw via a coupling. Two sets of first fixing plates are threaded onto the bidirectional lead screw, with two plates in each set. A first bevel gear is fixedly connected to the outer wall of the bidirectional lead screw. A second bevel gear is threaded onto the outer wall of the first bevel gear. A fixing rod is fixedly connected to the outer wall of the second bevel gear. Two extrusion blocks are fixedly connected to the outer wall of the fixing rod.

[0008] Preferably, the outer wall of the bidirectional lead screw is rotatably connected to the inner wall of the moving mold, the bidirectional lead screw is provided with two sets of bidirectional threaded grooves, the outer wall of the fixed rod is rotatably connected to the inner wall of the moving mold, the outer wall of the frame is fixedly connected to a first hydraulic device, the output end of the first hydraulic device is fixedly connected to a first hydraulic rod, and the side of the first hydraulic rod away from the first hydraulic device is fixedly connected to the outer wall of the moving mold.

[0009] Preferably, the core-pulling mechanism includes a telescopic rod fixedly connected to the inner wall of the moving mold, a connecting plate fixedly connected to the outer wall of the telescopic rod, the outer wall of the connecting plate being slidably connected to the inner wall of the moving mold, two movable cores fixedly connected to the outer wall of the connecting plate, a first spring fixedly connected to the side of the connecting plate near the telescopic rod, and the side of the first spring away from the connecting plate being fixedly connected to the inner wall of the moving mold.

[0010] Preferably, the telescopic rod is located inside the first spring, a limiting plate is fixedly connected to the inner wall of the moving mold, a plurality of limiting shafts are fixedly connected to the inner wall of the moving mold, two locking plates are slidably connected to the outer walls of the plurality of limiting shafts, a plurality of second springs are fixedly connected to the outer walls of the two locking plates, a locking block is locked to the outer wall of the locking plate, and the outer wall of the locking block is fixedly connected to the inner wall of the connecting plate.

[0011] Preferably, two electric push rods are fixedly connected to the inner wall of the moving mold, and connecting blocks are fixedly connected to the outer walls of the two electric push rods. The outer walls of the two connecting blocks are fixedly connected to the outer wall of the connecting plate, and the outer walls of the two connecting blocks are slidably connected to the inner wall of the moving mold.

[0012] Preferably, the ejector mechanism includes a second hydraulic unit fixedly connected to the outer wall of the moving mold, a second hydraulic rod fixedly connected to the output end of the second hydraulic unit, a second fixing plate fixedly connected to the side of the second hydraulic rod away from the second hydraulic unit, and a guide plate fixedly connected to the inner wall of the moving mold.

[0013] Preferably, the guide plate is provided with a plurality of sliding sleeves, the outer wall of the second fixed plate is fixedly connected with a plurality of first limiting frames, the outer walls of the plurality of first limiting frames are in contact with the same parts, the inner walls of the first limiting frames are slidably connected with second limiting frames, and the inner walls of the second limiting frames are slidably connected with U-shaped blocks.

[0014] Preferably, the inner wall of the U-shaped block is rotatably connected to a rotating shaft, the outer wall of the rotating shaft is fixedly connected to a rotating block, the inner wall of the rotating block is rotatably connected to an ejector pin via the rotating shaft, the outer wall of the ejector pin is slidably connected to the inner wall of the sliding sleeve provided on the guide plate, and the outer wall of the ejector pin is slidably connected to the inner wall of the moving mold.

[0015] This invention also discloses a demolding method for a direct-ejection core-pulling demolding device applied to injection molds, specifically including the following steps: S1. Start the motor through an external controller to make the bidirectional lead screw rotate. When the bidirectional lead screw rotates, it will drive the first bevel gear to rotate, which in turn will cause the second bevel gear to rotate together. S2. Two sets of bidirectional threaded grooves are symmetrically arranged on the bidirectional lead screw. When the bidirectional lead screw rotates, the two sets of first fixed plates can move. Each set of first fixed plates will move away from each other, so that the first fixed plates are separated from the surface of the product and friction is reduced. S3. As the second bevel gear rotates, the fixed rod will rotate along with it, causing the extrusion block to rotate around the fixed rod. When the extrusion block is in a vertical position, it will cooperate with the core-pulling mechanism to perform the core-pulling operation.

[0016] Preferably, the motor in S1 is a servo motor, which can precisely control the number of rotations and the speed, thereby precisely controlling the rotation angle of the bidirectional lead screw and ensuring the precise timing of subsequent actions.

[0017] The present invention has the following beneficial effects: 1. This direct-ejection core-pulling demolding device and method for injection molds uses a motor to drive a bidirectional lead screw to rotate, causing two sets of first fixed plates to move away from each other. This allows the product to detach from the product surface before the ejector pins eject it, solving the problem of excessive friction between the product and mold components during traditional demolding processes. In traditional techniques, whether the ejector pins eject directly or the pusher blocks push laterally, the product remains in contact with the mold cavity or demolding components during demolding, resulting in relative movement. This easily leaves defects such as white spots, scratches, or tears on the product surface. This problem severely affects the yield rate, especially for transparent parts and other products with high surface quality requirements. This device, through its clearance design, reduces the contact between the product surface and the cavity during ejection, reducing the risk of frictional damage and improving product appearance quality and production qualification rate.

[0018] 2. This direct-acting core-pulling demolding device and method for injection molds cleverly links the rotation of the bidirectional lead screw with the core-pulling unlocking action through a bevel gear transmission mechanism. The rotation of the bidirectional lead screw simultaneously drives the first bevel gear to rotate, which in turn drives the second bevel gear and the fixed rod to rotate. The extrusion block on the fixed rod rotates to a vertical position, extruding the clamping plates and causing them to move away from each other and compress the second spring. This removes the restriction on the clamping blocks, and the movable core quickly retracts under the tension of the first spring. This achieves a purely mechanical linkage between the clearance movement and the core-pulling action, eliminating the need for additional power sources, sensors, or electronic control systems, thus reducing mold manufacturing costs and failure rates.

[0019] 3. This direct-ejection core-pulling demolding device and demolding method for injection molds integrates a guide plate, a first limiting frame, a second limiting frame, and a flexible connection structure consisting of a U-shaped block, a rotating shaft, and a rotating block into the ejection system, forming a complete ejector pin protection system. The guide plate provides high-precision vertical guidance for the ejector pins, ensuring that the movement trajectory of each ejector pin is consistent, thus solving the problem of asynchronous ejector pin movement caused by uneven force on the ejection plate in traditional molds. The cooperative design of the first and second limiting frames allows for slight positional adjustments of the ejector pins in the horizontal direction, avoiding jamming caused by processing errors or thermal expansion. The flexible connector consisting of the U-shaped block, rotating shaft, and rotating block enables a flexible connection between the tail of the ejector pin and the second fixed plate. When the second fixed plate slightly bends due to uneven force, this structure can effectively absorb the deviation, preventing the ejector pin from bending and breaking due to additional lateral bending moment.

[0020] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the structure of the first hydraulic device of the present invention; Figure 3 This is a schematic diagram of the active core structure of the present invention; Figure 4 This is a schematic diagram of the internal structure of the moving mold of the present invention; Figure 5 This is a schematic planar view of the internal structure of the moving mold of the present invention; Figure 6 This is a schematic diagram of the limiting plate structure of the present invention; Figure 7 This is a schematic diagram of the electric actuator structure of the present invention; Figure 8 This is a schematic diagram of the structure of the second hydraulic device of the present invention; Figure 9 For the present invention Figure 4 Enlarged structural diagram at point A in the middle; Figure 10 For the present invention Figure 8 Enlarged structural diagram at point B.

[0023] The attached diagram lists the components represented by each number as follows: 1. Frame; 101. Fixed mold; 102. Moving mold; 103. Guide frame; 2. Demolding mechanism; 201. Motor; 202. Bidirectional lead screw; 203. First fixed plate; 204. First bevel gear; 205. Second bevel gear; 206. Fixed rod; 207. First hydraulic actuator; 208. First hydraulic rod; 3. Core pulling mechanism; 301. Telescopic rod; 302. Connecting plate; 303. Movable core; 304. First spring; 305. Limiting device 306. Plate; 307. Extrusion block; 308. Limiting shaft; 309. Clamping plate; 310. Second spring; 311. Clamping block; 312. Electric push rod; 313. Connecting block; 4. Ejector mechanism; 401. Second hydraulic device; 402. Second hydraulic rod; 403. Second fixing plate; 404. Guide plate; 405. First limiting frame; 406. Second limiting frame; 407. U-shaped block; 408. Rotating shaft; 409. Rotating block; 410. Ejector pin. Detailed Implementation

[0024] 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.

[0025] This invention discloses a direct-ejection core-pulling demolding device for injection molds, and provides the following three technical solutions: Figures 1-10The first embodiment is shown: a direct-ejection core-pulling demolding device and demolding method applied to injection molds, including a frame 1, a fixed mold 101 fixedly connected to the inner wall of the frame 1, and two guide frames 103 fixedly connected to the bottom of the frame 1. The guide frames 103 provide precise guidance for the movement of the moving mold 102, ensuring that the moving mold 102 always maintains a stable linear movement during the mold opening and closing process, avoiding mold damage or product molding defects caused by skewness. The moving mold 102 is slidably connected to the inner wall of the two fixed molds 101. A demolding mechanism 2 is provided inside the moving mold 102, a core-pulling mechanism 3 is provided inside the moving mold 102, and an ejector pin mechanism 4 is provided inside the moving mold 102. A motor 201 is fixedly connected to the top of the moving mold 102. The output shaft of the motor 201 is fixedly connected to a bidirectional lead screw 202 via a coupling. The motor 201 is a servo motor, which can precisely control the number of rotations and the speed, thereby precisely controlling the rotation angle of the bidirectional lead screw 202 and ensuring the precise timing of subsequent actions. Two sets of first fixing plates 203 are threadedly connected to the bidirectional lead screw 202, two in each set. The bidirectional lead screw 202 has two sets of threaded grooves with opposite directions of rotation. When the bidirectional lead screw 202 rotates, the two sets of first fixing plates 203 are threaded... Driven by the system, the system performs synchronous linear motion in opposite or opposite directions, with smooth motion and high positional accuracy. A first bevel gear 204 is fixedly connected to the outer wall of the bidirectional lead screw 202, and a second bevel gear 205 is threadedly connected to the outer wall of the first bevel gear 204. A fixed rod 206 is fixedly connected to the outer wall of the second bevel gear 205. Through the meshing transmission between the first bevel gear 204 and the second bevel gear 205, the rotation of the bidirectional lead screw 202 is accurately transmitted to the fixed rod 206, realizing power steering and motion transmission. Two extrusion blocks 306 are fixedly connected to the outer wall of the fixed rod 206.

[0026] The outer wall of the bidirectional lead screw 202 is rotatably connected to the inner wall of the moving mold 102. Both ends of the bidirectional lead screw 202 are supported on the inner wall of the moving mold 102 by bearings, ensuring smooth rotation and minimal radial runout. The bidirectional lead screw 202 has two sets of bidirectional threaded grooves. The pitch and direction of the two sets of threaded grooves are designed according to the travel requirements of the first fixed plate 203, ensuring that the two sets of first fixed plates 203 can complete the action of detaching from the product surface within a predetermined time. The outer wall of the fixing rod 206 is also rotatably connected to the inner wall of the moving mold 102. The fixing rod 206 is also... The bearing supports the smooth rotation of the extrusion block 306, ensuring that it can accurately reach the predetermined position. A first hydraulic device 207 is fixedly connected to the outer wall of the frame 1. A first hydraulic rod 208 is fixedly connected to the output end of the first hydraulic device 207. The side of the first hydraulic rod 208 away from the first hydraulic device 207 is fixedly connected to the outer wall of the moving mold 102. By driving the first hydraulic rod 208 to extend and retract through the first hydraulic device 207, the moving mold 102 can be controlled to open and close along the guide frame 103, providing a basis for subsequent demolding and core pulling actions.

[0027] Figures 1-10The second embodiment is shown, and its main difference from the first embodiment is that the core-pulling mechanism 3 includes a telescopic rod 301 fixedly connected to the inner wall of the moving mold 102. A connecting plate 302 is fixedly connected to the outer wall of the telescopic rod 301. The telescopic rod 301 provides guidance for the movement of the connecting plate 302, ensuring that the connecting plate 302 and the movable core 303 always move along a predetermined straight trajectory, avoiding skewing that could lead to jamming or molding defects. The outer wall of the connecting plate 302 is slidably connected to the inner wall of the moving mold 102. A wear-resistant guide strip is provided between the connecting plate 302 and the inner wall of the moving mold 102 to reduce frictional resistance and ensure smooth movement. Two movable cores 303 are fixedly connected to the outer wall of the connecting plate 302. The movable cores 303 are used to form the internal hole structure of the product. Their shape and size are determined according to the product design requirements. A first spring 304 is fixedly connected to the side of the connecting plate 302 near the telescopic rod 301. The side of the first spring 304 away from the connecting plate 302 is fixedly connected to the inner wall of the moving mold 102.

[0028] The telescopic rod 301 is located inside the first spring 304. The telescopic rod 301 serves as a guide and support, preventing the first spring 304 from bending or deforming during compression or tension, and ensuring that the spring force always acts axially. A limit plate 305 is fixedly connected to the inner wall of the moving mold 102. The limit plate 305 limits the maximum movement distance of the connecting plate 302, preventing the movable core 303 from excessively withdrawing. Several limit shafts 307 are fixedly connected to the inner wall of the moving mold 102, and the outer walls of the several limit shafts 307 are slidably connected to... Two clamping plates 308 are provided with a limiting shaft 307 to precisely guide the sliding of the clamping plates 308, ensuring that the two clamping plates 308 can smoothly move closer or further apart. Several second springs 309 are fixedly connected to the outer walls of the two clamping plates 308. The second springs 309 always apply opposing preload to the two clamping plates 308 to ensure that the clamping plates 308 can automatically reset and clamp the clamping block 310 when no external force is applied. The clamping block 310 is clamped to the outer wall of the clamping plate 308, and the outer wall of the clamping block 310 is fixedly connected to the inner wall of the connecting plate 302.

[0029] Two electric push rods 311 are fixedly connected to the inner wall of the moving mold 102. Connecting blocks 312 are fixedly connected to the outer walls of the two electric push rods 311. The electric push rods 311 are synchronously controlled to ensure that the force is even when the two connecting blocks 312 push the connecting plate 302, thus avoiding the connecting plate 302 from tilting. The outer walls of the two connecting blocks 312 are fixedly connected to the outer wall of the connecting plate 302, and the outer walls of the two connecting blocks 312 are slidably connected to the inner wall of the moving mold 102. The sliding cooperation between the connecting blocks 312 and the inner wall of the moving mold 102 provides auxiliary guidance for the reset movement of the connecting plate 302, further enhancing the stability of the movement.

[0030] Figures 1-10The third embodiment is shown. The main difference between this embodiment and the first two is that the ejector mechanism 4 includes a second hydraulic unit 401 fixedly connected to the outer wall of the moving mold 102. A second hydraulic rod 402 is fixedly connected to the output end of the second hydraulic unit 401. A second fixed plate 403 is fixedly connected to the side of the second hydraulic rod 402 away from the second hydraulic unit 401. The second hydraulic unit 401 provides ejection power. The second fixed plate 403 is pushed to make linear motion through the second hydraulic rod 402, which drives all ejector pins 410 to be ejected synchronously. A guide plate 404 is fixedly connected to the inner wall of the moving mold 102.

[0031] The guide plate 404 is provided with several sliding sleeves, which are made of high wear-resistant material. The inner hole is precisely matched with the ejector pin 410 to provide independent vertical guidance for each ejector pin and ensure that the ejector pin movement trajectory is consistent. Several first limiting frames 405 are fixedly connected to the outer wall of the second fixed plate 403. The parts contacted by the outer walls of the several first limiting frames 405 are the same. The inner wall of the first limiting frame 405 is slidably connected to the second limiting frame 406. The sliding fit between the first limiting frame 405 and the second limiting frame 406 allows the tail of the ejector pin 410 to have a small displacement adjustment in the horizontal direction, absorbing the position deviation caused by processing error or thermal expansion. The inner wall of the second limiting frame 406 is slidably connected to the U-shaped block 407.

[0032] A rotating shaft 408 is rotatably connected to the inner wall of the U-shaped block 407, and a rotating block 409 is fixedly connected to the outer wall of the rotating shaft 408. Through the rotatable connection between the rotating shaft 408 and the rotating block 409, the tail of the ejector pin 410 can achieve a slight angular swing, further absorbing the bending deformation of the second fixed plate 403. The ejector pin 410 is rotatably connected to the inner wall of the rotating block 409 via the rotating shaft. The rotatable connection between the ejector pin 410 and the rotating block 409 allows the ejector pin to adaptively fine-tune its angle, avoiding jamming or bending caused by rigid connection. The outer wall of the ejector pin 410 is slidably connected to the inner wall of the sliding sleeve provided on the guide plate 404, and the outer wall of the ejector pin 410 is slidably connected to the inner wall of the moving mold 102. Through the multi-level guiding and flexible connection structure of the guide plate 404, the first limiting frame 405, the second limiting frame 406, the U-shaped block 407, the rotating shaft 408 and the rotating block 409, the ejector pin 410 always maintains a vertical posture during the movement, and can adaptively absorb various deviations from the second fixed plate 403, fundamentally solving the problems of ejector pin wear, jamming and breakage.

[0033] This invention also discloses a demolding method for a direct-ejection core-pulling demolding device applied to injection molds, specifically including the following steps: After the product is formed, the first hydraulic press 207 is activated by an external controller, which drives the first hydraulic rod 208 to retract. Simultaneously, the moving mold 102 is controlled to detach from the surface of the fixed mold 101 and move along the guide frame 103. After detachment, the motor 201 is activated by the external controller, driving the bidirectional lead screw 202 to rotate. As the bidirectional lead screw 202 rotates, the two sets of first fixed plates 203 are controlled to move away from each other, thus detaching from the product surface and preventing excessive friction on the product surface during demolding, which could cause scratches. During the rotation of the bidirectional lead screw 202, the first bevel gear 204 rotates, causing the second bevel gear 205 to rotate. As gear 205 rotates, it drives fixed rod 206 to rotate. Simultaneously, the rotation of fixed rod 206 causes the pressing block 306 on it to rotate. When the first fixed plate 203 completely detaches from the product surface, the pressing block 306 will be in a vertical position, pressing the clamping plates 308. This causes the two clamping plates 308 to move away from the pressing block 306 and compress the second spring 309. When the two clamping plates 308 move away from each other, the limiting effect on clamping block 310 is released. At this point, due to the tension of the first spring 304, connecting plate 302 moves, simultaneously causing movable core 303 to move and detach from the molding cavity of moving mold 102. When connecting plate 302 moves to the position of limiting plate 305, it is stopped by the limiting plate. The ejector pin 410 is stopped at the limit plate 305 by 305. The electric push rod 311 retracts in response. After the core-pulling action is completed, the second hydraulic actuator 401 is activated via an external controller, driving the second hydraulic rod 402 to push the second fixed plate 403, which in turn drives the ejector pin 410 to perform the demolding operation. Due to the cooperation of the first limit frame 405 and the second limit frame 406, the ejector pin 410 can move slightly in position. Simultaneously, the presence of the U-shaped block 407, the rotating shaft 408, and the rotating block 409 allows the ejector pin 410 to rotate slightly. Furthermore, in cooperation with the guide plate 404, the position of the ejector pin 410 is limited, preventing slight bending of the second fixed plate 403, which could cause the ejector pin 410 to bend and prevent the product from being demolded. Successful demolding results in surface damage to the product. After demolding, an external controller and configured algorithm synchronize the movement of two electric push rods 311, which in turn push the connecting plate 302 via the connecting block 312. This, in turn, causes the movable core 303 to return to the cavity. Then, the external controller starts the motor 201, which reverses the bidirectional lead screw 202, causing the two sets of first fixed plates 203 to return to their original positions. As the fixed rod 206 rotates, it also causes the pressing block 306 to rotate, thus releasing the pressure on the clamping plate 308. When the clamping plate 308 is no longer restricted, the second spring 309 presses against the clamping plate 308, causing it to re-restrict the clamping block 310, thereby fixing the position of the connecting plate 302.Repeat the next round of injection molding.

[0034] Furthermore, all content not described in detail in this specification is existing technology known to those skilled in the art, and the model parameters of each electrical component are not specifically limited; conventional equipment can be used.

[0035] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0036] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A direct-acting core-pulling demolding device for injection molds, comprising a frame (1), wherein a fixed mold (101) is fixedly connected to the inner wall of the frame (1), and two guide frames (103) are fixedly connected to the bottom of the frame (1), and a movable mold (102) is slidably connected to the inner walls of both fixed molds (101), characterized in that, The moving mold (102) is provided with a demolding mechanism (2), a core pulling mechanism (3), and an ejector pin mechanism (4). A motor (201) is fixedly connected to the top of the moving mold (102). The output shaft of the motor (201) is fixedly connected to a bidirectional lead screw (202) via a coupling. Two sets of first fixing plates (203) are threaded onto the bidirectional lead screw (202), two in each set. A first bevel gear (204) is fixedly connected to the outer wall of the bidirectional lead screw (202). A second bevel gear (205) is threaded onto the outer wall of the first bevel gear (204). A fixing rod (206) is fixedly connected to the outer wall of the second bevel gear (205). Two extrusion blocks (306) are fixedly connected to the outer wall of the fixing rod (206).

2. The direct-acting core-pulling demolding device for injection molds according to claim 1, characterized in that, The outer wall of the bidirectional lead screw (202) is rotatably connected to the inner wall of the moving mold (102). The bidirectional lead screw (202) is provided with two sets of bidirectional threaded grooves. The outer wall of the fixed rod (206) is rotatably connected to the inner wall of the moving mold (102). The outer wall of the frame (1) is fixedly connected to a first hydraulic device (207). The output end of the first hydraulic device (207) is fixedly connected to a first hydraulic rod (208). The side of the first hydraulic rod (208) away from the first hydraulic device (207) is fixedly connected to the outer wall of the moving mold (102).

3. The direct-acting core-pulling and demolding device for injection molds according to claim 1, characterized in that, The core-pulling mechanism (3) includes a telescopic rod (301) fixedly connected to the inner wall of the moving mold (102). A connecting plate (302) is fixedly connected to the outer wall of the telescopic rod (301). The outer wall of the connecting plate (302) is slidably connected to the inner wall of the moving mold (102). Two movable cores (303) are fixedly connected to the outer wall of the connecting plate (302). A first spring (304) is fixedly connected to the side of the connecting plate (302) near the telescopic rod (301). The side of the first spring (304) away from the connecting plate (302) is fixedly connected to the inner wall of the moving mold (102).

4. The direct-acting core-pulling demolding device for injection molds according to claim 3, characterized in that, The telescopic rod (301) is located inside the first spring (304). The inner wall of the moving mold (102) is fixedly connected to a limiting plate (305). The inner wall of the moving mold (102) is fixedly connected to several limiting shafts (307). The outer walls of the several limiting shafts (307) are respectively slidably connected to two clamping plates (308). The outer walls of the two clamping plates (308) are fixedly connected to several second springs (309). The outer wall of the clamping plate (308) is clamped to a clamping block (310). The outer wall of the clamping block (310) is fixedly connected to the inner wall of the connecting plate (302).

5. The direct-acting core-pulling demolding device for injection molds according to claim 4, characterized in that, Two electric push rods (311) are fixedly connected to the inner wall of the moving mold (102). Connecting blocks (312) are fixedly connected to the outer walls of the two electric push rods (311). The outer walls of the two connecting blocks (312) are fixedly connected to the outer wall of the connecting plate (302). The outer walls of the two connecting blocks (312) are slidably connected to the inner wall of the moving mold (102).

6. The direct-acting core-pulling demolding device for injection molds according to claim 1, characterized in that, The ejector mechanism (4) includes a second hydraulic unit (401) fixedly connected to the outer wall of the moving mold (102), a second hydraulic rod (402) fixedly connected to the output end of the second hydraulic unit (401), a second fixing plate (403) fixedly connected to the side of the second hydraulic rod (402) away from the second hydraulic unit (401), and a guide plate (404) fixedly connected to the inner wall of the moving mold (102).

7. The direct-acting core-pulling demolding device for injection molds according to claim 6, characterized in that, The guide plate (404) is provided with a plurality of sliding sleeves, and the outer wall of the second fixed plate (403) is fixedly connected with a plurality of first limiting frames (405). The outer walls of the plurality of first limiting frames (405) are in contact with the same parts. The inner wall of the first limiting frame (405) is slidably connected with a second limiting frame (406), and the inner wall of the second limiting frame (406) is slidably connected with a U-shaped block (407).

8. The direct-acting core-pulling demolding device for injection molds according to claim 7, characterized in that, The inner wall of the U-shaped block (407) is rotatably connected to a rotating shaft (408), and the outer wall of the rotating shaft (408) is fixedly connected to a rotating block (409). The inner wall of the rotating block (409) is rotatably connected to an ejector pin (410) via the rotating shaft. The outer wall of the ejector pin (410) is slidably connected to the inner wall of the sliding sleeve provided on the guide plate (404), and the outer wall of the ejector pin (410) is slidably connected to the inner wall of the moving mold (102).

9. A demolding method using a direct-acting core-pulling demolding device for injection molds, employing the direct-acting core-pulling demolding device for injection molds as described in any one of claims 1-8, characterized in that... Specifically, the following steps are included: S1. Start the motor (201) through the external controller to make the bidirectional lead screw (202) rotate. When the bidirectional lead screw (202) rotates, it will drive the first bevel gear (204) to rotate, which will cause the second bevel gear (205) to rotate together. S2. Two sets of bidirectional threaded grooves are symmetrically arranged on the bidirectional screw (202). When the bidirectional screw (202) rotates, the two sets of first fixing plates (203) move. Each set of first fixing plates (203) will move away from each other, so that the first fixing plates (203) are separated from the surface of the product and friction is reduced. S3. When the second bevel gear (205) rotates, the fixed rod (206) will rotate along with it, and the extrusion block (306) will rotate around the fixed rod (206). When the extrusion block (306) is in a vertical state, it will cooperate with the core-pulling mechanism (3) to perform the core-pulling operation.

10. A demolding method for a direct-push core-pulling demolding device for injection molds according to claim 9, characterized in that, The motor (201) in S1 is a servo motor, which can precisely control the number of rotations and the speed, thereby precisely controlling the rotation angle of the bidirectional lead screw (202) and ensuring the precise timing of subsequent actions.

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