Uniform ejection force mold structure for thin-walled toys

Abstract

The application relates to the technical field of injection molds, in particular to a uniform ejection force mold structure for a thin-wall toy, which comprises an ejection assembly and a leveling assembly. The ejection assembly comprises a plurality of ejection rod units, and independent adjustment is realized through elastic adjusting devices; the leveling assembly comprises a pressure sensor array, a floating plate and a linkage mechanism, and is used for dynamically balancing the ejection force. The floating plate is provided with a flow guide groove and an elastic gasket, can discharge gas and buffer pressure. Through real-time monitoring and automatic adjustment of the ejection force, the problems of uneven force, poor adaptability and complex operation during demolding of the thin-wall toy are solved, and the demolding efficiency and adaptive flexibility are improved.

Description

Technical Field

[0001] This utility model belongs to the field of mold manufacturing and injection molding technology, specifically a uniform ejection force mold structure for thin-walled toys. Background Technology

[0002] In the injection molding process of thin-walled toys, the design of the mold ejection mechanism plays a crucial role in the demolding quality of the product. Currently, most common mold ejection structures on the market adopt single-point or partial multi-point ejection methods. This design can easily lead to uneven force distribution on thin-walled toys during demolding, resulting in quality problems such as deformation and surface damage. In addition, existing ejection mechanisms often require complex adjustments to adapt to thin-walled toys of different shapes and sizes, increasing production costs and operational difficulty.

[0003] In the prior art, the Chinese utility model patent (application number: CN202323260616.6) discloses an "ejection structure for an injection mold," which includes an upper mold with a lower mold at its bottom and a molding cavity at the top of the lower mold; an electric telescopic rod at the bottom of the lower mold and an ejector mechanism in the inner cavity of the movable groove for ejecting the molded product; an auxiliary mechanism including a fixed tube and a threaded tube, the fixed tube being located at the bottom of the lower mold and the threaded tube being fixed to one end of the fixed tube; a first flexible tube fixed to the other end of the fixed tube; and multiple positioning components equidistantly arranged at the top of the ejector mechanism for supplying air to the ejector mechanism. However, the above patent still has certain limitations, and the distribution of ejection force during demolding is still difficult to fully meet the requirements.

[0004] Therefore, we have made improvements to this by proposing a uniform ejection force mold structure for thin-walled toys. Utility Model Content

[0005] The purpose of this invention is to solve the problems of uneven force distribution, poor adaptability, and complex operation of the ejection mechanism in the current injection molding process of thin-walled toys.

[0006] To achieve the aforementioned objectives and address the problems, this utility model provides a uniform ejection force mold structure for thin-walled toys, comprising an ejection assembly and a leveling assembly. The ejection assembly includes multiple ejector rod units distributed on the mold base plate, each ejector rod unit being connected to the base plate via an independent elastic adjustment device. The leveling assembly is located above the ejection assembly and is used to dynamically balance and adjust the force on the ejector rod units during ejection. Through the synergistic effect of the ejection assembly and the leveling assembly, the uniformity of force during demolding of thin-walled toys can be effectively improved, while simplifying the adaptation process for products of different shapes and sizes.

[0007] The ejector unit includes an ejector body, a sliding sleeve, and a guide post. The ejector body is cylindrical with an arc-shaped protrusion at its top for contacting the bottom of the mold cavity and applying ejection force. The sliding sleeve is fitted onto the outside of the ejector body and fixed to the base plate via a threaded connection. The guide post is fixed to the base plate and passes through the central hole of the sliding sleeve, limiting the movement direction of the ejector body. A spring seat is located at the lower end of the ejector body, and a compression spring is provided between the spring seat and the sliding sleeve to provide a restoring force for the ejector body.

[0008] The elastic adjustment device includes an adjusting nut and a limiting ring. The adjusting nut is fixed to the outside of the sliding sleeve by a threaded connection, and its inner side has a boss for engaging with the limiting ring. The limiting ring is sleeved on the outside of the push rod body and located inside the sliding sleeve, used to limit the maximum stroke of the push rod body. By rotating the adjusting nut, the position of the limiting ring can be changed, thereby adjusting the preload of the compression spring and realizing independent adjustment of the push force of each push rod unit.

[0009] The leveling assembly includes a pressure sensor array, a floating plate, and a linkage mechanism. The pressure sensor array is located on the lower surface of the floating plate and is used to monitor the force on each push rod unit in real time. The floating plate is slidably connected to the inner wall of the mold cavity via guide pins, and its upper surface has multiple grooves to accommodate the top ends of the push rod bodies. The linkage mechanism includes a connecting sleeve and a hinge seat. One end of the connecting sleeve is hinged to the floating plate, and the other end is connected to the hinge seat on the base plate, for transmitting the vertical movement of the floating plate to the base plate.

[0010] The floating plate has a through hole at its center, and an elastic washer is installed inside the through hole to form a buffer between the floating plate and the mold cavity. There are four guide pins, located at the four corners of the floating plate, and lubrication grooves are provided on their outer sides to reduce frictional resistance. The lower surface of the floating plate also has multiple guide grooves to discharge gas from the mold cavity and avoid ejection force deviation caused by gas pressure imbalance.

[0011] As a preferred technical solution of this application, the arc-shaped protruding surface of the top rod body is coated with a wear-resistant coating to improve the service life of the top rod body; the thickness of the wear-resistant coating is 0.1mm to 0.3mm, and the material is polytetrafluoroethylene or ceramic composite material.

[0012] As a preferred technical solution of this application, anti-loosening washers are provided at both ends of the compression spring to prevent the spring from loosening during long-term use; the outer diameter of the anti-loosening washers matches the inner diameter of the sliding sleeve, and its inner diameter matches the outer diameter of the push rod body.

[0013] As a preferred technical solution of this application, there are two connecting sleeve rods, located on both sides of the floating plate, and their lengths can be adjusted by adjusting bolts; the pitch of the adjusting bolts is 1mm, which is used to precisely control the extension and retraction of the connecting sleeve rods.

[0014] As a preferred technical solution of this application, each sensor unit of the pressure sensor array is connected by a flexible circuit board to transmit the collected pressure signal to an external control system; the flexible circuit board has a thickness of 0.2 mm and a bending radius of 5 mm.

[0015] As a preferred technical solution of this application, the inner side of the elastic washer is provided with a corrugated structure to enhance its elastic performance; the height of the corrugated structure is 1mm and the width is 2mm.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0017] By incorporating ejector units and a leveling assembly, dynamic adjustment of the ejection force is achieved during the demolding process of thin-walled toys. The ejector units, through independent elastic adjustment devices, can be flexibly adjusted according to the specific shape and size of the mold cavity, ensuring uniform ejection force distribution for each unit. The pressure sensor array in the leveling assembly monitors the force on the ejector units in real time and, through the cooperation of a floating plate and a linkage mechanism, feeds back force deviations to the base plate, thereby achieving automatic balancing adjustment of the ejection force. Furthermore, the guide channel design on the floating plate effectively discharges gas from the mold cavity, preventing ejection force deviations caused by pressure imbalances. This structural design not only improves the uniformity of force during the demolding of thin-walled toys but also significantly simplifies the adaptation process for products of different shapes and sizes, solving the problems of uneven force distribution, poor adaptability, and complex operation in existing ejection mechanisms. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0019] Figure 2 This is a sectional view of the push rod unit.

[0020] Figure 3 This is a schematic diagram of the leveling component.

[0021] Figure 4 This is a schematic diagram of the bottom structure of the floating plate.

[0022] Figure 5 This is a partial enlarged view of the elastic adjustment device.

[0023] The attached figures are labeled as follows:

[0024] 1. Mold base plate; 2. Ejector pin unit; 3. Ejector pin body; 4. Sliding sleeve; 5. Guide pin; 6. Elastic adjustment device; 7. Adjusting nut; 8. Limiting ring; 9. Compression spring; 10. Leveling assembly; 11. Floating plate; 12. Pressure sensor array; 13. Guide pin; 14. Connecting sleeve; 15. Hinge seat; 16. Elastic washer; 17. Flow channel. Detailed Implementation

[0025] This utility model provides a uniform ejection force mold structure for thin-walled toys, the overall structure of which is as follows: Figure 1 As shown, the device includes a mold base plate 1, an ejection assembly, and a leveling assembly 10. The ejection assembly consists of multiple ejector pin units 2, each of which is connected to the mold base plate 1 via an independent elastic adjustment device 6. The leveling assembly 10 is located above the ejection assembly and is used to dynamically balance the force on each ejector pin unit 2 during the ejection process. The specific embodiments of this utility model are described in detail below with reference to the accompanying drawings.

[0026] Push rod unit 2 is the core component of the ejector assembly, and its specific structure is as follows: Figure 2 As shown. The ejector unit 2 includes an ejector body 3, a sliding sleeve 4, a guide post 5, and an elastic adjustment device 6. The ejector body 3 is a cylindrical structure with an arc-shaped protrusion at its top. The surface of the arc-shaped protrusion is coated with a wear-resistant coating with a thickness of 0.1 mm to 0.3 mm. The coating material is polytetrafluoroethylene or ceramic composite material. The sliding sleeve 4 is fitted on the outer side of the ejector body 3 and is fixed to the mold base plate 1 by a threaded connection. The guide post 5 is fixed to the mold base plate 1 and passes through the center hole of the sliding sleeve 4 to limit the movement direction of the ejector body 3, ensuring that the ejector body 3 moves vertically during ejection. A spring seat is provided at the lower end of the ejector body 3. A compression spring 9 is installed between the spring seat and the sliding sleeve 4. Anti-loosening washers are provided at both ends of the compression spring 9. The outer diameter of the anti-loosening washers matches the inner diameter of the sliding sleeve 4, and the inner diameter matches the outer diameter of the ejector body 3, to prevent the compression spring 9 from loosening during long-term use. The function of the compression spring 9 is to provide a restoring force for the push rod body 3, so that it can automatically return to its initial position after the push-out action is completed.

[0027] The structure of the elastic adjustment device 6 is as follows: Figure 5As shown, the assembly includes an adjusting nut 7 and a limiting ring 8. The adjusting nut 7 is fixed to the outside of the sliding sleeve 4 via a threaded connection, and its inner side has a boss that mates with the limiting ring 8. The limiting ring 8 is sleeved on the outside of the ejector body 3 and located inside the sliding sleeve 4, used to limit the maximum stroke of the ejector body 3. By rotating the adjusting nut 7, the position of the limiting ring 8 can be changed, thereby adjusting the preload of the compression spring 9 and achieving independent adjustment of the ejection force of each ejector unit 2. This design allows the ejector unit 2 to flexibly adjust the ejection force according to the specific shape and size of the mold cavity, ensuring a uniform distribution of the ejection force of each ejector unit 2.

[0028] The structure of the leveling component 10 is as follows Figure 3 As shown, the system includes a floating plate 11, a pressure sensor array 12, guide pins 13, and a linkage mechanism. The floating plate 11 is slidably connected to the inner wall of the mold cavity via four guide pins 13, located at the four corners of the floating plate 11. Lubrication grooves are provided on the outer sides of the guide pins 13 to reduce frictional resistance and ensure smooth and stable movement of the floating plate 11 during its up-and-down motion. Multiple grooves are provided on the upper surface of the floating plate 11 to accommodate the top end of the push rod body 3. The pressure sensor array 12 is mounted on the lower surface of the floating plate 11. Each sensor unit of the pressure sensor array 12 is connected via a flexible circuit board with a thickness of 0.2 mm and a bending radius of 5 mm, capable of transmitting the collected pressure signals to an external control system. A through hole is provided at the center of the floating plate 11, and an elastic washer 16 is installed inside the through hole. The inner side of the elastic washer 16 has a corrugated structure with a height of 1 mm and a width of 2 mm to enhance the elastic performance of the elastic washer 16. The function of the elastic washer 16 is to form a buffer between the floating plate 11 and the mold cavity, avoiding wear or damage caused by direct contact. In addition, the lower surface of the floating plate 11 is provided with multiple guide grooves 17, which are used to discharge the gas in the mold cavity and avoid ejection force deviation caused by gas pressure imbalance.

[0029] The linkage mechanism includes two connecting sleeves 14 and two hinge seats 15. The connecting sleeves 14 are located on opposite sides of the floating plate 11. One end of each connecting sleeve 14 is hinged to the floating plate 11, and the other end is connected to the hinge seat 15 on the mold base plate 1, transmitting the vertical movement of the floating plate 11 to the mold base plate 1. The length of the connecting sleeve 14 can be adjusted using adjusting bolts with a pitch of 1mm to precisely control the extension and retraction of the connecting sleeve 14. By adjusting the length of the connecting sleeves 14, the initial position of the floating plate 11 can be changed, thus adapting to mold cavities of different heights.

[0030] The working principle of this utility model is as follows: During the injection molding process, the demolding of thin-walled toys requires the coordinated action of the ejection assembly and the leveling assembly 10. After injection molding is completed, when the product in the mold cavity needs to be ejected, the ejector unit 2 is ejected upward under the action of the compression spring 9, and the arc-shaped protrusion of the ejector body 3 contacts the bottom of the mold cavity and applies an ejection force. Since the elastic adjustment device 6 of each ejector unit 2 can independently adjust the preload of the compression spring 9, the ejection force of each ejector unit 2 can be flexibly adjusted according to the specific shape and size of the mold cavity to ensure uniform distribution of the ejection force. At the same time, the pressure sensor array 12 in the leveling assembly 10 monitors the force on each ejector unit 2 in real time and transmits the collected pressure signal to the external control system. If the force on a certain ejector unit 2 is too large or too small, the pressure sensor array 12 will feed back the signal to the external control system, and the external control system will adjust the position of the floating plate 11 through the linkage mechanism to achieve dynamic balance adjustment of the ejection force. The guide groove 17 on the floating plate 11 discharges the gas in the mold cavity during the ejection process, avoiding the deviation of ejection force caused by gas pressure imbalance.

[0031] In practical applications, this invention can significantly improve the uniformity of force distribution during demolding of thin-walled toys. For example, when producing thin-walled toys with complex curved surface structures, traditional ejection mechanisms are prone to product deformation or damage due to uneven force distribution. This invention effectively solves this problem by independently adjusting the ejection force of each ejector unit 2 and by implementing a dynamic balance adjustment function. Furthermore, the guide groove 17 design on the floating plate 11 can also prevent ejection force deviation caused by the inability of gas in the mold cavity to be discharged in time, further improving the product qualification rate.

[0032] The various components of this invention achieve efficient functional collaboration through precise design and fit. For example, the fit between the ejector body 3 and the sliding sleeve 4 ensures stable vertical movement of the ejector body 3; the elastic adjustment device 6 achieves precise control of the preload of the compression spring 9 through the fit between the adjusting nut 7 and the limiting ring 8; the elastic washer 16 between the floating plate 11 and the mold cavity not only provides a buffering effect but also enhances the durability of the system. These design details together constitute a complete mold structure, solving the problems of uneven force distribution, poor adaptability, and complex operation of the ejection mechanism in the prior art.

[0033] To enable those skilled in the art to fully understand and implement this utility model, the specific implementation principle of this utility model is further supplemented below with a specific application scenario.

[0034] In the injection molding process of thin-walled toys, after the mold completes injection, the ejector assembly and leveling assembly work together to demold the product. First, the drive device on the mold base plate 1 is activated, causing the ejector unit 2 to move upwards under the action of the compression spring 9. At this time, the ejector body 3 moves axially along the guide post 5 to ensure its vertical stability. The arc-shaped protrusion at the top of the ejector body 3 contacts the bottom of the mold cavity and applies an initial ejection force. Since the elastic adjustment device 6 of each ejector unit 2 can independently adjust the preload of the compression spring 9 through the adjusting nut 7, the ejection force can be flexibly distributed according to the specific shape and size of the mold cavity, avoiding product deformation or surface damage caused by excessive or insufficient local force.

[0035] Meanwhile, the floating plate 11 in the leveling assembly 10 is slidably connected to the inner wall of the mold cavity via guide pins 13, ensuring smooth and stable up-and-down movement. The upper surface of the floating plate 11 has multiple grooves to accommodate the top of the ejector body 3, thus providing support for the ejector unit 2. During ejection, the pressure sensor array 12 monitors the force on each ejector unit 2 in real time and transmits the collected pressure signals to the external control system via a flexible circuit board. If the force on a particular ejector unit 2 deviates, such as excessive or insufficient ejection force, the pressure sensor array 12 will feed back the signal to the external control system. The external control system then adjusts the position of the floating plate 11 via a linkage mechanism to dynamically balance the forces among the ejector units 2. Specifically, one end of the connecting sleeve 14 is hinged to the floating plate 11, and the other end is connected to the hinge seat 15 on the mold base plate 1. The extension and retraction of the connecting sleeve 14 are precisely controlled by adjusting bolts, thereby changing the initial position of the floating plate 11 and achieving dynamic adjustment of the ejection force.

[0036] Furthermore, during the ejection process, the gas inside the mold cavity may not be able to escape in time due to space constraints, leading to pressure imbalance and affecting the uniformity of the ejection force. To address this, multiple guide channels 17 are designed on the lower surface of the floating plate 11 to guide the gas out of the mold cavity. The optimized layout of the guide channels 17 effectively reduces gas stagnation, thus avoiding ejection force deviations caused by pressure imbalances. Simultaneously, the inner side of the elastic washer 16 within the central through-hole of the floating plate 11 has a corrugated structure. This design not only enhances the elasticity of the elastic washer 16 but also creates a buffer between the floating plate 11 and the mold cavity, preventing wear or damage caused by direct contact.

[0037] Throughout the ejection process, the return of the ejector rod body 3 relies on the return force provided by the compression spring 9. Anti-loosening washers at both ends of the compression spring 9 effectively prevent the spring from loosening during long-term use, thus ensuring the stability and reliability of the ejector rod unit 2. After the ejection action is completed, the ejector rod body 3 automatically returns to its initial position under the action of the compression spring 9, preparing for the next injection molding.

[0038] As can be seen from the above steps, this utility model achieves a uniform distribution of ejection force during the demolding process of thin-walled toys by combining the independent adjustment function of the ejector unit 2 with the dynamic balance adjustment function of the leveling component 10. Specifically, the elastic adjustment device 6, through the cooperation of the adjusting nut 7 and the limiting ring 8, can precisely control the preload of the compression spring 9, thereby flexibly adapting to mold cavities of different shapes and sizes. The pressure sensor array 12 in the leveling component 10 works in conjunction with the linkage mechanism to monitor and adjust the force on the ejector unit 2 in real time, ensuring that the ejection force is always uniformly distributed. In addition, the design of the guide groove 17 on the floating plate 11 effectively solves the problem of gas retention in the mold cavity, further improving the product qualification rate.

[0039] In summary, this utility model, through precise design and efficient collaboration between components, solves the problems of uneven force distribution, poor adaptability, and complex operation of ejection mechanisms in the prior art, and significantly improves the demolding quality and production efficiency in the injection molding process of thin-walled toys.

Claims

1. A uniform ejection force mold structure for thin-walled toys, characterized in that, The system includes a mold base plate (1), an ejection assembly, and a leveling assembly (10). The ejection assembly includes multiple ejector rod units (2) distributed on the mold base plate (1), each ejector rod unit (2) being connected to the mold base plate (1) via an independent elastic adjustment device (6). The leveling assembly (10) is located above the ejection assembly and is used to dynamically balance the force on the ejector rod unit (2) during the ejection process. The ejector rod unit (2) includes an ejector rod body (3), a sliding sleeve (4), and a guide post (5). The ejector rod body (3) is a cylindrical structure with an arc-shaped protrusion at its top. The sliding sleeve (4) is fitted onto the mold base plate (1). The outer side of the ejector body (3) is fixed to the mold base plate (1) by a threaded connection. The guide post (5) is fixed to the mold base plate (1) and passes through the center hole of the sliding sleeve (4) to limit the movement direction of the ejector body (3). The elastic adjustment device (6) includes an adjusting nut (7) and a limiting ring (8). The adjusting nut (7) is fixed to the outer side of the sliding sleeve (4) by a threaded connection. Its inner side is provided with a boss for cooperating with the limiting ring (8). The limiting ring (8) is sleeved on the outer side of the ejector body (3) and located inside the sliding sleeve (4) to limit the maximum stroke of the ejector body (3).

2. The uniform ejection force mold structure for thin-walled toys according to claim 1, characterized in that, The leveling assembly (10) includes a pressure sensor array (12), a floating plate (11), and a linkage mechanism. The pressure sensor array (12) is located on the lower surface of the floating plate (11) and is used to monitor the force on each push rod unit (2) in real time. The floating plate (11) is slidably connected to the inner wall of the mold cavity through a guide pin (13). Its upper surface is provided with multiple grooves to accommodate the top of the push rod body (3). The linkage mechanism includes a connecting sleeve (14) and a hinge seat (15). One end of the connecting sleeve (14) is hinged to the floating plate (11), and the other end is connected to the hinge seat (15) on the mold base plate (1).

3. The uniform ejection force mold structure for thin-walled toys according to claim 2, characterized in that, The floating plate (11) has a through hole at its center, and an elastic washer (16) is provided inside the through hole. The inner side of the elastic washer (16) has a corrugated structure with a height of 1 mm and a width of 2 mm.

4. The uniform ejection force mold structure for thin-walled toys according to claim 3, characterized in that, The number of guide pins (13) is four, located at the four corners of the floating plate (11), and a lubrication groove is provided on the outside of each pin.

5. The uniform ejection force mold structure for thin-walled toys according to claim 2, characterized in that, The lower surface of the floating plate (11) is provided with multiple guide grooves (17) for exporting gas from the mold cavity.

6. The uniform ejection force mold structure for thin-walled toys according to claim 1, characterized in that, The arc-shaped protrusion surface of the top rod body (3) is coated with a wear-resistant coating with a thickness of 0.1 mm to 0.3 mm. The material of the wear-resistant coating is polytetrafluoroethylene or ceramic composite material.

7. The uniform ejection force mold structure for thin-walled toys according to claim 1, characterized in that, The compression spring (9) is provided with anti-loosening washers at both ends. The outer diameter of the anti-loosening washers matches the inner diameter of the sliding sleeve (4), and its inner diameter matches the outer diameter of the push rod body (3).

8. A uniform ejection force mold structure for thin-walled toys according to claim 2, characterized in that, The number of connecting sleeve rods (14) is two, located on both sides of the floating plate (11), and their length can be adjusted by adjusting bolts with a pitch of 1 mm.

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