Secondary core-pulling structure of injection mold for chamfered inner side surface elbow

Abstract

The application relates to a secondary core-pulling structure of a bent pipe injection mold with a chamfered inner side, which comprises a movable mold, a fixed mold and two demolding mechanisms, the demolding mechanisms comprise a straight pipe demolding assembly and a bent pipe demolding assembly, the straight pipe demolding assembly comprises a straight core and a driving piece one for driving the straight core to move; the bent pipe demolding assembly comprises a bent pipe core, a mounting block, a hinged rod, a fixing rod and a driving piece two, the mounting block is fixed in the bent pipe core through screws, the fixing rod is arranged in the straight core and slides in the core-pulling direction of the straight core, the two ends of the hinged rod are hingedly connected to the mounting block and the fixing rod respectively, and the driving piece two drives the fixing rod to move. Due to the hinged connection relationship of the hinged rod, the linear movement of the fixing rod can drive the bent pipe core to perform the core-pulling action; the secondary core-pulling structure ingeniously solves the problem that the bent pipe core cannot be normally rotated to perform core pulling due to the R angle of nearly 90 DEG and the absence of steps on the inner wall, simplifies the difficulty of mold design, and ensures the smooth demolding of the bent pipe.

Description

Technical Field

[0001] This utility model relates to the field of molds, and in particular to a secondary core-pulling structure for a beveled inner side bending injection mold. Background Technology

[0002] Pipe bends are widely used in our daily lives. During the processing of pipe bends, they are usually formed by injection molding using molds.

[0003] For example Figure 1 When the bent tube 5 shown is demolded, two sets of demolding modules are required. Each set of demolding modules includes a straight core 21 and a bent tube core 31. First, the straight core 21 of the straight tube part is pulled out to make room for the core pulling action of the bent tube core 31. Only then can the core pulling operation of the bent tube core 31 be carried out.

[0004] The aforementioned bent core has a radius of nearly 90°, and the inner wall of the bent core has no steps. This makes it impossible to pull the bent core using a normal rotating core-pulling action, which increases the design difficulty of the mold. Utility Model Content

[0005] To address the issue of core pulling in the aforementioned bent tube core, this application provides a secondary core pulling structure for injection molds with chamfered inner side bent tubes.

[0006] The technical solution provided in this application for a secondary core-pulling structure for a chamfered inner side bending tube injection mold is as follows:

[0007] A secondary core-pulling structure for a chamfered inner side curved tube injection mold includes a moving mold, a fixed mold, and two demolding mechanisms. The demolding mechanisms include a straight tube demolding assembly and a curved tube demolding assembly. The straight tube demolding assembly includes a straight core and a driving component for moving the straight core.

[0008] The tube bending demolding assembly includes a tube bending core, a mounting block, a hinge rod, a fixing rod, and a second driving component. The mounting block is fixed inside the tube bending core with screws. The fixing rod passes through and slides inside the straight core along the core-pulling direction of the straight core. The two ends of the hinge rod are respectively hinged to the mounting block and the fixing rod. The second driving component drives the fixing rod to move.

[0009] By adopting the above technical solution, during demolding, the first drive component drives the straight core to move and pull out the straight tube section, making room for the core pulling of the bent tube and also making room for the movement of the hinge rod. Then, the second drive component drives the fixed rod to move. Due to the hinged connection of the hinge rod, the linear movement of the fixed rod can drive the bent tube core to perform the core pulling action. This secondary core pulling structure cleverly solves the problem that the bent tube core cannot be pulled by ordinary rotation due to its nearly 90° R angle and the lack of steps on the inner wall. It simplifies the difficulty of mold design, ensures the smooth demolding of the bent tube, and improves the practicality of the mold and production efficiency.

[0010] Preferably, the driving component includes a hydraulic cylinder, a support, and a movable seat. The straight core is fixed to the movable seat by screws. The movable seat has a through hole for the fixing rod to pass through. The support is fixed to the moving mold. The movable seat slides on the support. The hydraulic cylinder is fixedly mounted on the support. The piston rod of the hydraulic cylinder is fixedly mounted on the movable seat.

[0011] By adopting the above technical solution, the hydraulic cylinder can provide stable and strong power to push the moving seat to slide on the support, thereby driving the straight core to perform the core pulling action. Its structure is simple and the transmission is reliable. Moreover, by controlling the stroke and speed of the hydraulic cylinder, the pulling distance and speed of the straight core can be precisely controlled, ensuring the accuracy and stability of the core pulling action of the straight tube part, creating good conditions for the subsequent core pulling of the bent tube core, and also improving the efficiency and reliability of the entire demolding process.

[0012] Preferably, the second driving component includes a movable frame, a core-pulling component, and a reset component. One end of the fixed rod extending out of the movable seat is fixed to the movable frame by screws. The core-pulling component is used to drive the movable frame to move in the core-pulling direction, and the reset component drives the movable frame to reset.

[0013] By adopting the above technical solution, the core-pulling component drives the moving frame to move, which in turn drives the fixed rod. The hinged rod then facilitates the core-pulling operation of the bent tube core, ensuring the smooth execution of the core-pulling action. The reset component promptly drives the moving frame to reset after core-pulling, returning the entire bent tube demolding assembly to its initial position, preparing it for the next injection molding demolding. This design makes the movement of the bent tube demolding assembly more continuous and automated, improving mold efficiency while reducing manual intervention and labor intensity.

[0014] Preferably, the core-pulling component is a movable base.

[0015] By adopting the above technical solution, the movable seat is used as the core-pulling component, so that the core-pulling process of the straight core and the core-pulling process of the bent tube core are linked. When the straight core is pulled, the movement of the movable seat not only completes the demolding of the straight tube part, but also drives the movable frame to indirectly realize the core-pulling of the bent tube core. This simplifies the structure and transmission process, reduces the additional power device required to drive the core-pulling of the bent tube core separately, reduces the mold cost, and improves the coordination and stability of the entire demolding mechanism.

[0016] Preferably, the side of the movable frame facing the movable seat is a first vertical surface perpendicular to the core-pulling direction of the straight core, and the side of the movable seat facing the movable frame has a second vertical surface directly opposite the first vertical surface.

[0017] By adopting the above technical solution, the setting of two vertical surfaces can ensure the stability and accuracy of the contact between the two when the moving seat drives the moving frame to move, avoiding deviation or misalignment during the movement, thereby ensuring the accuracy of the core pulling action of the bent tube core; at the same time, this vertical surface design is also convenient for installation and debugging, improves the assembly accuracy and working reliability of the mold, and further ensures the quality and efficiency of the bent tube injection molding demolding.

[0018] Preferably, the reset component includes a sleeve and a limiting groove. The sleeve is sleeved on a fixed rod, and the fixed rod has a stepped surface. The limiting groove is formed on a movable seat and communicates with a through hole. The limiting groove allows the sleeve to move. When the movable frame is fully reset, the two ends of the sleeve abut against the stepped surface and the end wall of the limiting groove, respectively.

[0019] By adopting the above technical solution, during the resetting process of the movable seat, the end wall of the limiting groove abuts against the sleeve, thereby driving the hinge rod to move and reset. This resetting structure is simple, reliable, low in cost, and can work stably for a long time, reducing the frequency of maintenance and repair and improving the service life of the mold.

[0020] Preferably, the bend demolding assembly further includes a first proximity switch, a second proximity switch, and two abutment blocks. The two abutment blocks are respectively fixedly disposed on both sides of the movable seat. The first proximity switch and the second proximity switch are respectively fixedly disposed on both sides of the support and are respectively located on the moving path of the corresponding abutment block. The abutment block is provided with an inclined surface for contacting the proximity switch.

[0021] By adopting the above technical solution, the first proximity switch and the second proximity switch can accurately monitor the position of the moving seat. When the moving seat moves the abutment block and the inclined surface on the abutment block contacts the proximity switch, the proximity switch can provide timely feedback signals, thereby accurately controlling the core-pulling stroke of the moving seat. This setting avoids over-pulling or under-pulling during the core-pulling process, ensuring the accuracy and safety of the demolding action, improving product quality and production efficiency, and also facilitating the automated control of the mold demolding process.

[0022] The main technical effects of this utility model are reflected in the following aspects:

[0023] 1. In the demolding process of this utility model, the first driving component drives the straight core to move and pull out the straight tube part, making room for the core pulling of the bent tube and also making room for the movement of the hinge rod. Then, the second driving component drives the fixed rod to move. Due to the hinged connection of the hinge rod, the linear movement of the fixed rod can drive the bent tube core to perform the core pulling action. This two-stage core pulling structure cleverly solves the problem that the bent tube core cannot be pulled by ordinary rotation due to its nearly 90° R angle and the lack of steps on the inner wall. It simplifies the difficulty of mold design, ensures the smooth demolding of the bent tube, and improves the practicality of the mold and production efficiency.

[0024] 2. This utility model uses a movable seat as a core-pulling component, which links the core-pulling process of the straight core with the core-pulling process of the bent tube core. When the straight core is being pulled, the movement of the movable seat not only completes the demolding of the straight tube part, but also drives the movable frame to indirectly realize the core-pulling of the bent tube core. This simplifies the structure and transmission process, reduces the additional power device required to drive the core-pulling of the bent tube core separately, reduces the mold cost, and improves the coordination and stability of the entire demolding mechanism. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the bent pipe and two sets of detachable modules.

[0026] Figure 2 This is a schematic diagram of the overall structure of the mold in the embodiment of this application.

[0027] Figure 3 This is a schematic diagram of the demolding mechanism in an embodiment of this application.

[0028] Figure 4 It is along Figure 3 A cross-sectional view along line AA in the middle.

[0029] Figure 5 This is a schematic diagram showing the state of the movable seat moving to abut against the movable frame during the core-pulling process of the movable seat in this embodiment of the application.

[0030] Figure 6 This is a schematic diagram of the structure of the pipe bending demolding assembly according to an embodiment of this application.

[0031] Figure 7 yes Figure 6 Enlarged view of point B in the middle.

[0032] Explanation of reference numerals in the attached drawings: 11. Moving mold; 12. Fixed mold; 2. Straight tube demolding assembly; 21. Straight core; 22. Hydraulic cylinder; 23. Support; 24. Moving seat; 241. Through hole; 242. Second vertical surface; 3. Bending tube demolding assembly; 31. Bending tube core; 32. Mounting block; 33. Hinge rod; 34. Fixing rod; 35. Moving frame; 351. First vertical surface; 36. Sleeve; 37. Limiting groove; 41. First proximity switch; 42. Second proximity switch; 43. Abutment block; 431. Inclined surface; 5. Bending tube. Detailed Implementation

[0033] The following is in conjunction with the appendix Figures 1-7 This application will be described in further detail to make the technical solution of this application easier to understand and master.

[0034] This application discloses a secondary core-pulling structure for a beveled inner side bending injection mold.

[0035] Reference Figures 1-3 The secondary core-pulling structure of the chamfered inner side bend injection mold of this embodiment includes a moving mold 11, a fixed mold 12 and two demolding mechanisms. The demolding mechanism includes a straight pipe demolding assembly 2 and a bend demolding assembly 3. The straight pipe demolding assembly 2 includes a straight core 21 and a driving component for driving the straight core 21 to move.

[0036] Reference Figures 3-6 The tube bending demolding assembly 3 includes a tube bending core 31, a mounting block 32, a hinge rod 33, a fixing rod 34, and a second driving component. The mounting block 32 is fixed inside the tube bending core 31 by screws. The fixing rod 34 passes through and slides inside the straight core 21 along the core-pulling direction of the straight core 21. The two ends of the hinge rod 33 are respectively hinged to the mounting block 32 and the fixing rod 34. The second driving component drives the fixing rod 34 to move.

[0037] Reference Figures 3-6 During demolding, the first drive component moves the straight core 21 to extract the straight tube section, making room for the bent core 31 to be pulled out and also making room for the movement of the hinge rod 33. Then, the second drive component moves the fixed rod 34. Due to the hinged connection of the hinge rod 33, the linear movement of the fixed rod 34 can drive the bent core 31 to perform the core pulling action. This secondary core pulling structure cleverly solves the problem that the bent core 31 cannot be pulled out by ordinary rotation due to its nearly 90° R angle and the lack of steps on the inner wall. It simplifies the difficulty of mold design, ensures the smooth demolding of the bent tube 5, and improves the practicality and production efficiency of the mold.

[0038] Reference Figure 3 When the mold is closed, the two bent tube cores 31 of the two demolding mechanisms abut against each other and are spliced ​​together.

[0039] Reference Figures 3-6The driving component includes a hydraulic cylinder 22, a support 23, and a movable seat 24. The straight core 21 is fixed to the movable seat 24 by screws. The movable seat 24 has a through hole 241 for the fixed rod 34 to pass through. The support 23 is fixed to the moving mold 11, and the movable seat 24 slides on the support 23. The hydraulic cylinder 22 is fixedly mounted on the support 23, and the piston rod of the hydraulic cylinder 22 is fixedly mounted on the movable seat 24.

[0040] Reference Figures 3-6 The hydraulic cylinder 22 provides stable and strong power to push the moving seat 24 to slide on the support 23, thereby driving the straight core 21 to perform the core pulling action. Its structure is simple and the transmission is reliable. Moreover, by controlling the stroke and speed of the hydraulic cylinder 22, the pulling distance and speed of the straight core 21 can be precisely controlled, ensuring the accuracy and stability of the core pulling action of the straight tube part, creating good conditions for the subsequent core pulling of the bent tube core 31, and also improving the efficiency and reliability of the entire demolding process.

[0041] Reference Figures 3-6 The second driving component includes a movable frame 35, a core-pulling component, and a reset component. One end of the fixed rod 34 extending out of the movable seat 24 is fixed to the movable frame 35 by screws. The core-pulling component is used to drive the movable frame 35 to move in the core-pulling direction, and the reset component drives the movable frame 35 to reset.

[0042] Reference Figures 3-6 The core-pulling component drives the moving frame 35 to move, which in turn drives the fixed rod 34. Through the hinge rod 33, the core-pulling operation of the bent tube core 31 is realized, ensuring the smooth progress of the core-pulling action. The reset component can promptly drive the moving frame 35 to reset after the core-pulling is completed, returning the entire bent tube demolding assembly 3 to its initial position, preparing it for the next injection molding demolding. This design makes the action of the bent tube demolding assembly 3 more continuous and automated, improving the working efficiency of the mold while reducing manual intervention and labor intensity.

[0043] Reference Figures 3-6 The core-pulling component is the movable seat 24. Using the movable seat 24 as the core-pulling component allows the core-pulling process of the straight core 21 to be linked with the core-pulling process of the bent core 31. When the straight core 21 is being pulled, the movement of the movable seat 24 not only completes the demolding of the straight tube part, but also drives the movable frame 35, indirectly realizing the core-pulling of the bent core 31. This simplifies the structure and transmission process, reduces the additional power device required to drive the bending core 31 separately, lowers the mold cost, and improves the coordination and stability of the entire demolding mechanism.

[0044] Reference Figures 3-6 The side of the movable frame 35 facing the movable seat 24 is a first vertical surface 351 perpendicular to the core-pulling direction of the straight core 21, and the side of the movable seat 24 facing the movable frame 35 is provided with a second vertical surface 242 that is directly opposite to the first vertical surface 351.

[0045] Reference Figures 3-6 The arrangement of two vertical surfaces ensures the stability and accuracy of the contact between the movable seat 24 and the movable frame 35 when they move, preventing offset or misalignment during movement and thus ensuring the precision of the core-pulling action of the bent tube core 31. At the same time, this vertical surface design facilitates installation and debugging, improves the assembly accuracy and working reliability of the mold, and further ensures the quality and efficiency of the injection molding and demolding of the bent tube 5.

[0046] Reference Figure 3 and Figure 4 The reset component includes a sleeve 36 and a limiting groove 37. The sleeve 36 is sleeved on the fixed rod 34, and the fixed rod 34 has a stepped surface. The limiting groove 37 is opened on the movable seat 24 and communicates with the through hole 241. The limiting groove 37 allows the sleeve 36 to move. When the movable frame 35 is fully reset, the two ends of the sleeve 36 abut against the stepped surface and the end wall of the limiting groove 37, respectively.

[0047] Reference Figure 3 and Figure 4 With the two vertical surfaces, during the reset process of the movable seat 24, the end wall of the limiting groove 37 abuts against the sleeve 36, thereby driving the hinge rod 33 to move and reset. This reset structure is simple, reliable, low in cost, and can work stably for a long time, reducing the frequency of maintenance and repair and improving the service life of the mold.

[0048] Reference Figures 5-7 The pipe bending demolding assembly 3 also includes a first proximity switch 41, a second proximity switch 42, and two abutment blocks 43. The two abutment blocks 43 are respectively fixedly disposed on both sides of the movable seat 24. The first proximity switch 41 and the second proximity switch 42 are respectively fixedly disposed on both sides of the support 23 and are respectively located on the moving path of the corresponding abutment block 43. An inclined surface 431 for contacting the proximity switch is provided on the abutment block 43.

[0049] Reference Figures 5-7 The first proximity switch 41 and the second proximity switch 42 can accurately monitor the position of the moving seat 24. When the moving seat 24 drives the abutment block 43 to move, and the inclined surface 431 on the abutment block 43 contacts the proximity switch, the proximity switch can promptly provide feedback signals, thereby accurately controlling the core-pulling stroke of the moving seat 24. This setting avoids over-pulling or under-pulling during the core-pulling process, ensuring the accuracy and safety of the demolding action, improving product quality and production efficiency, and also facilitating the automated control of the mold demolding process.

[0050] Of course, the above are just typical examples of this application. In addition, this application may have many other specific implementation methods. All technical solutions formed by equivalent substitution or equivalent transformation fall within the scope of protection claimed in this application.

Claims

1. A secondary core-pulling structure for injection molds of bends with chamfered inner surfaces, characterized in that: It includes a moving mold (11), a fixed mold (12) and two demolding mechanisms. The demolding mechanisms include a straight pipe demolding assembly (2) and a bent pipe demolding assembly (3). The straight pipe demolding assembly (2) includes a straight core (21) and a driving component for moving the straight core (21). The tube bending demolding assembly (3) includes a tube bending core (31), a mounting block (32), a hinge rod (33), a fixing rod (34), and a second driving component. The mounting block (32) is fixed inside the tube bending core (31) by screws. The fixing rod (34) passes through and slides inside the straight core (21) along the core-pulling direction of the straight core (21). The two ends of the hinge rod (33) are respectively hinged to the mounting block (32) and the fixing rod (34). The second driving component drives the fixing rod (34) to move.

2. The secondary core-pulling structure for a chamfered inner side bend injection mold according to claim 1, characterized in that: The driving component includes a hydraulic cylinder (22), a support (23), and a movable seat (24). The straight core (21) is fixed to the movable seat (24) by screws. The movable seat (24) has a through hole (241) for the fixed rod (34) to pass through. The support (23) is fixed to the moving mold (11). The movable seat (24) slides on the support (23). The hydraulic cylinder (22) is fixedly mounted on the support (23). The piston rod of the hydraulic cylinder (22) is fixedly mounted on the movable seat (24).

3. The secondary core-pulling structure for a chamfered inner side bend injection mold according to claim 2, characterized in that: The second driving component includes a movable frame (35), a core-pulling component, and a reset component. One end of the fixed rod (34) extending out of the movable seat (24) is fixed to the movable frame (35) by screws. The core-pulling component is used to drive the movable frame (35) to move in the core-pulling direction, and the reset component drives the movable frame (35) to reset.

4. The secondary core-pulling structure for a chamfered inner side bend injection mold according to claim 3, characterized in that: The core-pulling component is a movable base (24).

5. The secondary core-pulling structure for a chamfered inner side bend injection mold according to claim 4, characterized in that: The side of the movable frame (35) facing the movable seat (24) is a first vertical surface (351) perpendicular to the core-pulling direction of the straight core (21), and a second vertical surface (242) opposite to the first vertical surface (351) is opened on the side of the movable seat (24) facing the movable frame (35).

6. The secondary core-pulling structure for a chamfered inner side bend injection mold according to claim 3, characterized in that: The reset component includes a sleeve (36) and a limiting groove (37). The sleeve (36) is sleeved on the fixed rod (34). The fixed rod (34) has a stepped surface. The limiting groove (37) is opened on the movable seat (24) and communicates with the through hole (241). The limiting groove (37) allows the sleeve (36) to move. When the movable frame (35) is fully reset, the two ends of the sleeve (36) abut against the stepped surface and the end wall of the limiting groove (37), respectively.

7. The secondary core-pulling structure for a chamfered inner side bend injection mold according to claim 2, characterized in that: The bend demolding assembly (3) further includes a first proximity switch (41), a second proximity switch (42), and two abutment blocks (43). The two abutment blocks (43) are respectively fixedly disposed on both sides of the movable seat (24). The first proximity switch (41) and the second proximity switch (42) are respectively fixedly disposed on both sides of the support (23) and are respectively located on the moving path of the corresponding abutment block (43). The abutment block (43) is provided with an inclined surface (431) for contacting the proximity switch.

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