Secondary expanding and flaring injection mold for plastic pipe

Abstract

This application relates to a secondary flaring injection mold for plastic pipes, including a front mold and a rear mold, and a side core-pulling mechanism. The side core-pulling mechanism includes a core-pulling block, multiple flaring blocks, and a driving assembly. The core-pulling block is slidably connected to the rear mold, and a connecting ring is slidably connected to the rear mold along the sliding direction of the core-pulling block. Multiple hinge rods are rotatably connected to the connecting ring along a direction perpendicular to its axis. The multiple flaring blocks are respectively fixedly connected to their corresponding hinge rods, which are divided into two groups. The driving assembly is used to drive the two groups of hinge rods to rotate sequentially and the core-pulling blocks to slide. During mold opening, the driving assembly drives the two groups of hinge rods to rotate sequentially to demold the flared section, and then drives the flaring block and the core-pulling block to move together to demold the pipe opening. The side core-pulling mechanism can achieve step-by-step demolding during mold opening, effectively solving the problem that traditional molds cannot handle complex flaring structures, improving the versatility and production efficiency of the mold, and facilitating the injection molding of plastic pipes.

Description

Technical Field

[0001] This utility model relates to the field of injection mold technology, and in particular to a secondary flaring injection mold for plastic pipes. Background Technology

[0002] A flared T-joint refers to widening the opening of a T-joint water pipe to meet specific connection or usage requirements. For example... Figure 8 The product shown is a plastic pipe. This plastic pipe is a T-shaped pipe with two of the pipe ends having an inverted flared structure.

[0003] In existing technologies, after injection molding the tee pipe, it is often processed again to form a flared structure. First, the pipe opening of the tee pipe is heated to a certain temperature to soften the material, and then a specific flaring tool, such as a flaring mold or flaring device, is used to expand the softened pipe opening. However, this process involves many steps and is slow. Utility Model Content

[0004] To facilitate the injection molding of plastic pipes, this application provides a secondary flaring injection mold for plastic pipes.

[0005] The technical solution of the secondary flaring injection mold for plastic pipes provided in this application is as follows:

[0006] A secondary flaring injection mold for plastic pipes includes a front mold and a rear mold, and a side core-pulling mechanism. The side core-pulling mechanism includes a core-pulling block, multiple flaring blocks, and a driving assembly. The core-pulling block is slidably connected to the rear mold. A connecting ring is slidably connected to the rear mold along the sliding direction of the core-pulling block. Multiple hinge rods are rotatably connected to the connecting ring along a direction perpendicular to its axis. The multiple hinge rods correspond to multiple flaring blocks, and the multiple flaring blocks are fixedly connected to their respective hinge rods. The multiple hinge rods are divided into two groups. The driving assembly is used to drive the two groups of hinge rods to rotate sequentially and the core-pulling blocks to slide. During the mold opening process, the driving assembly drives the two groups of hinge rods to rotate sequentially to demold the flared end, and then drives the flaring block and the core-pulling block to move together to demold the pipe opening.

[0007] By adopting the above technical solution, during mold opening, the drive assembly first drives the two sets of hinge rods to rotate sequentially, causing the flaring block to retract towards the connecting ring axis and detach from the flared part of the plastic product. After the flaring block completely detaches from the flaring, the drive assembly drives the core-pulling block and the flaring block to move backward as a whole, detaching from the tube opening part of the plastic product. The side core-pulling mechanism can achieve step-by-step demolding during the mold opening process, effectively solving the problem that traditional molds cannot handle complex inverted flaring structures, improving the versatility and production efficiency of the mold, and facilitating the injection molding of plastic tubes.

[0008] Preferably, the plurality of flared blocks are evenly distributed along the circumference of the connecting ring, and the plurality of flared blocks in the same group are respectively arranged adjacent to the plurality of flared blocks in another group.

[0009] By adopting the above technical solution, the two sets of flared blocks rotate sequentially under the action of the drive component, and the adjacent flared blocks are demolded alternately, reducing the excessive resistance caused by simultaneous demolding and the possibility of interference during rotation.

[0010] Preferably, the driving assembly includes a sliding ring, a plurality of first abutment blocks, a plurality of second abutment blocks, and a driving source. The sliding ring is slidably connected to the rear mold along the axial direction of the connecting ring. The sliding ring is provided with a plurality of driving blocks, each corresponding to a plurality of first abutment blocks. The plurality of first abutment blocks and the plurality of second abutment blocks are respectively fixedly connected to a plurality of hinge rods of two sets of hinge rods. The driving source is used to drive the sliding ring and slide. When the sliding block moves toward the core-pulling block, the sliding block simultaneously abuts against a plurality of flared blocks. When the sliding ring moves toward the connecting ring, the plurality of abutment blocks first abut against the first abutment blocks, causing a set of hinge rods with the first abutment blocks fixed to them to rotate toward the axis of the connecting ring. Then, the end face of the sliding ring abuts against a plurality of second abutment blocks, causing a set of hinge rods with the second abutment blocks fixed to them to rotate toward the axis of the connecting ring.

[0011] By adopting the above technical solution, during mold closing, the sliding ring moves towards the core-pulling block, and the driving block abuts against the flaring block, limiting the positions of the hinge rods and the flaring block, reducing the possibility of displacement of the hinge rods and the flaring block during injection molding; during mold opening, when the sliding ring moves, the driving block first contacts the first abutting block, pushing the first set of hinge rods to rotate, and the sliding ring continues to move until its end face contacts the second abutting block, pushing the second set of hinge rods to rotate, thus achieving the forming and demolding of the flared part of the tube opening; through the linear motion of the sliding ring, the sequential rotation of the two sets of hinge rods is achieved.

[0012] Preferably, a clearance groove is provided on the middle section of each of the plurality of hinge rods.

[0013] By adopting the above technical solution, an avoidance groove is opened in the middle section of the hinge rod, which can avoid interference with other components during rotation, ensuring the smoothness of the hinge rod rotation, thereby ensuring the reliability of the entire demolding process.

[0014] Preferably, the driving source includes a hydraulic cylinder, a connecting cylinder, and a sliding block. The connecting cylinder is slidably connected to the rear mold, the connecting ring is fixedly connected inside the connecting cylinder, the sliding block is slidably connected inside the connecting cylinder, the connecting cylinder is provided with a connecting post, the core-pulling block is fixedly connected to the connecting post, the connecting cylinder is provided with a plurality of sliding rods, the sliding block is simultaneously slidably connected to a plurality of sliding rods, the sliding block is provided with a plurality of fixed rods, and the ends of the plurality of fixed rods away from the sliding block are fixedly connected to the sliding ring. The hydraulic cylinder is fixedly connected to the rear mold, and one end of the piston rod of the hydraulic cylinder is fixedly connected to the sliding block. During the mold opening process, the hydraulic cylinder drives the sliding block to slide to the limit position away from the connecting cylinder, and then the sliding block drives the connecting cylinder to move together.

[0015] By adopting the above technical solution, after the hydraulic cylinder is started, the piston rod pushes the sliding block to move axially along the connecting cylinder. The sliding block drives the sliding ring to move through the fixed rod, driving the two sets of hinged rods to rotate sequentially. After the sliding block moves to its limit position, the hydraulic cylinder continues to operate, driving the connecting cylinder and the core-pulling block to move as a whole, completing the demolding of the pipe opening.

[0016] Preferably, the connecting cylinder is provided with a limiting groove, and the front mold is provided with a limiting block that can cooperate with the limiting groove. When the mold is in the mold-closed state, the limiting block cooperates with the limiting groove.

[0017] By adopting the above technical solution, the cooperation between the limiting block and the limiting groove during high-pressure injection molding ensures the accurate position of the connecting cylinder when the mold is closed, thereby limiting the position of the flared block located in the connecting cylinder, reducing the possibility of dimensional errors in plastic products caused by positional deviation, and improving the molding quality of the flared part.

[0018] The main technical effects of this utility model are reflected in the following aspects:

[0019] 1. This utility model, by setting two sets of hinge rods and a flaring block, allows the drive assembly to first drive the two sets of hinge rods to rotate sequentially during mold opening, causing the flaring block to retract towards the connecting ring axis and detach from the flared portion of the plastic product. After the flaring block completely detaches from the flaring, the drive assembly drives the core-pulling block and the flaring block to move backward as a whole, detaching from the tube opening portion of the plastic product. The side core-pulling mechanism enables step-by-step demolding during mold opening, effectively solving the problem of traditional molds being unable to handle complex inverted flaring structures, improving the versatility and production efficiency of the mold, and facilitating the injection molding of plastic tubes.

[0020] 2. This utility model, by setting a sliding ring and a driving block, allows the sliding ring to move towards the core-pulling block during mold closing, while the driving block abuts against the flaring block, limiting the positions of the hinge rods and the flaring block and reducing the possibility of displacement of the hinge rods and the flaring block during injection molding. During mold opening, when the sliding ring moves, the driving block first contacts the first abutting block, pushing the first set of hinge rods to rotate. The sliding ring continues to move, its end face contacting the second abutting block, pushing the second set of hinge rods to rotate, thus achieving the forming and demolding of the flared part of the tube opening. Through the linear movement of the sliding ring, the sequential rotation of the two sets of hinge rods is achieved.

[0021] 3. This utility model, by setting a connecting cylinder and a sliding block, allows the piston rod to push the sliding block to move axially along the connecting cylinder after the hydraulic cylinder is started. The sliding block drives the sliding ring to move through the fixed rod, driving the two sets of hinged rods to rotate sequentially. After the sliding block moves to its limit position, the hydraulic cylinder continues to operate, driving the connecting cylinder and the core-pulling block to move as a whole, completing the demolding of the pipe opening. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application.

[0023] Figure 2 This is a schematic diagram of the rear mold structure in an embodiment of this application.

[0024] Figure 3 This is a schematic diagram of the side core-pulling mechanism in an embodiment of this application.

[0025] Figure 4 This is a schematic diagram of the structure of the first abutting block and the second abutting block in an embodiment of this application.

[0026] Figure 5 This is a schematic diagram of the flared block structure in an embodiment of this application.

[0027] Figure 6 This is a schematic diagram of the sliding ring structure according to an embodiment of this application.

[0028] Figure 7 This is a schematic diagram of the front mold structure in an embodiment of this application.

[0029] Figure 8 This is a schematic diagram of the plastic pipe structure according to an embodiment of this application.

[0030] Explanation of reference numerals in the attached drawings: 1. Front mold; 2. Rear mold; 3. Side core-pulling mechanism; 4. Core-pulling block; 5. Flaring block; 6. Drive assembly; 7. Connecting ring; 8. Hinge rod; 9. Sliding ring; 10. First abutment block; 11. Second abutment block; 12. Drive source; 13. Drive block; 14. Clearance groove; 15. Hydraulic cylinder; 16. Connecting cylinder; 17. Sliding block; 18. Connecting column; 19. Sliding rod; 20. Fixing rod; 21. Limiting groove; 22. Limiting block; 23. Plastic tube; 24. Flaring. Detailed Implementation

[0031] The following is in conjunction with the appendix Figures 1-8 This application will be described in further detail to make the technical solution of this application easier to understand and master.

[0032] This application discloses a secondary flaring injection mold for plastic pipes.

[0033] Reference Figure 1 , Figure 2 and Figure 5 This embodiment of a plastic tube secondary flaring injection mold includes a front mold 1 and a rear mold 2, and also includes a side core-pulling mechanism 3. The side core-pulling mechanism 3 includes a core-pulling block 4, multiple flaring blocks 24 5, and a driving assembly 6. The core-pulling block 4 is slidably connected to the rear mold 2. A connecting ring 7 is slidably connected to the rear mold 2 along the sliding direction of the core-pulling block 4. Multiple hinge rods 8 are rotatably connected to the connecting ring 7 along a direction perpendicular to its axis. The multiple hinge rods 8 correspond to the multiple flaring blocks 24 5 respectively. The multiple flaring blocks 24 5 are fixedly connected to the end of the corresponding hinge rod 8 away from the connecting ring 7. The multiple hinge rods 8 are divided into two groups. The multiple flaring blocks 24 5 are evenly distributed along the circumference of the connecting ring 7. The multiple flaring blocks 24 5 in the same group are respectively arranged adjacent to the multiple flaring blocks 24 5 in the other group. The drive assembly 6 is used to drive the two sets of hinge rods 8 to rotate in sequence and the core-pulling block 4 to slide. During the mold opening process, the drive assembly 6 drives the two sets of hinge rods 8 to rotate in sequence to demold the flared opening 24, and then drives the flared opening 24 block 5 and the core-pulling block 4 to move together to demold the tube opening.

[0034] Reference Figure 1 , Figure 2 and Figure 5 During mold opening, the drive assembly 6 first drives the two sets of hinge rods 8 to rotate sequentially, causing the flared section 24 5 to retract towards the axis of the connecting ring 7 and detach from the flared section 24 of the plastic product. After the flared section 24 5 is completely detached from the flared section 24, the drive assembly 6 drives the core-pulling block 4 and the flared section 24 5 as a whole to move backward, detaching from the tube opening of the plastic product. The side core-pulling mechanism 3 can achieve step-by-step demolding during the mold opening process, effectively solving the problem that traditional molds cannot handle complex inverted flared section 24 structures, improving the versatility and production efficiency of the mold, and facilitating the injection molding of the plastic tube 23. The two sets of flared section 24 5 rotate sequentially under the action of the drive assembly 6, and adjacent flared section 24 5 are demolded alternately, reducing the excessive resistance caused by simultaneous demolding and the possibility of interference during rotation.

[0035] Reference Figure 3 , Figure 5 and Figure 6The drive assembly 6 includes a sliding ring 9, multiple first abutment blocks 10, multiple second abutment blocks 11, and a drive source 12. The sliding ring 9 is slidably connected to the rear mold 2 along the axial direction of the connecting ring 7. The sliding ring 9 is provided with multiple drive blocks 13, which correspond to multiple first abutment blocks 10 respectively. The multiple first abutment blocks 10 and multiple second abutment blocks 11 are respectively fixedly connected to multiple hinge rods 8 of two sets of hinge rods 8. The drive source 12 is used to drive the sliding ring 9 to slide. When the sliding block 17 moves toward the core-pulling block 4, the sliding block 17 simultaneously abuts against multiple flared blocks 24 5. As the sliding ring 9 moves toward the connecting ring 7, multiple abutting blocks first abut against the first abutting block 10, causing a set of hinge rods 8 fixed with the first abutting block 10 to rotate toward the axis of the connecting ring 7. Then, the end face of the sliding ring 9 abuts against multiple second abutting blocks 11, causing a set of hinge rods 8 fixed with the second abutting blocks 11 to rotate toward the axis of the connecting ring 7.

[0036] Reference Figure 3 , Figure 5 and Figure 6 During mold closing, the sliding ring 9 moves towards the core-pulling block 4, and the driving block 13 abuts against the flared section 24 block 5, limiting the positions of the hinge rod 8 and the flared section 24 block 5, reducing the possibility of displacement of the hinge rod 8 and the flared section 24 block 5 during injection molding. During mold opening, when the sliding ring 9 moves, the driving block 13 first contacts the first abutting block 10, pushing the first set of hinge rods 8 to rotate. The sliding ring 9 continues to move, and its end face contacts the second abutting block 11, pushing the second set of hinge rods 8 to rotate, thus achieving the forming and demolding of the flared section 24. Through the linear movement of the sliding ring 9, the sequential rotation of the two sets of hinge rods 8 is achieved.

[0037] Reference Figure 4 and Figure 5 Each of the multiple hinge rods 8 has a clearance groove 14 on its middle section. The clearance groove 14 on the middle section of the hinge rod 8 can prevent interference with other parts during rotation, ensuring the smooth rotation of the hinge rod 8 and thus ensuring the reliability of the entire demolding process.

[0038] Reference Figure 1 and Figure 2The driving source 12 includes a hydraulic cylinder 15, a connecting cylinder 16, and a sliding block 17. The connecting cylinder 16 is slidably connected to the rear mold 2. The connecting ring 7 is fixedly connected inside the connecting cylinder 16. The sliding block 17 is slidably connected inside the connecting cylinder 16. A connecting post 18 is fixedly connected to the connecting cylinder 16. The core-pulling block 4 is fixedly connected to the connecting post 18. Several sliding rods 19 are fixedly connected to the connecting cylinder 16. The sliding block 17 is slidably connected to the several sliding rods 19. Several fixing rods 20 are fixedly connected to the sliding block 17. The end of the several fixing rods 20 away from the sliding block 17 is fixedly connected to the sliding ring 9. The hydraulic cylinder 15 is fixedly connected to the rear mold 2. One end of the piston rod of the hydraulic cylinder 15 is fixedly connected to the sliding block 17. When the mold is opened, the hydraulic cylinder 15 drives the sliding block 17 to slide to the limit position away from the connecting cylinder 16. The sliding block 17 then drives the connecting cylinder 16 to move together.

[0039] Reference Figure 1 and Figure 2 After the hydraulic cylinder 15 is activated, the piston rod pushes the sliding block 17 to move axially along the connecting cylinder 16. The sliding block 17 drives the sliding ring 9 to move via the fixed rod 20, which in turn drives the two sets of hinged rods 8 to rotate sequentially. After the sliding block 17 moves to its limit position, the hydraulic cylinder 15 continues to operate, driving the connecting cylinder 16 and the core-pulling block 4 to move as a whole, thus completing the demolding of the pipe opening.

[0040] Reference Figure 2 and Figure 7 A limiting groove 21 is provided on the connecting cylinder 16, and a limiting block 22 that can cooperate with the limiting groove 21 is fixedly connected to the front mold 1. When the mold is in the closed state, the limiting block 22 cooperates with the limiting groove 21. During high-pressure injection molding, the cooperation between the limiting block 22 and the limiting groove 21 ensures the accurate position of the connecting cylinder 16 when the mold is closed, thereby limiting the position of the flared section 24 5 located inside the connecting cylinder 16, reducing the possibility of dimensional errors in plastic products caused by positional deviations, and improving the molding quality of the flared section 24.

[0041] Reference Figure 1 , Figure 2 and Figure 7 In the mold closing state: the front mold 1 and the rear mold 2 are closed, the limiting block 22 is inserted into the limiting groove 21 of the connecting cylinder 16 to ensure positional accuracy; the flared block 24 5 forms a complete inverted flared cavity 24, and the core pulling block 4 forms the tube body cavity.

[0042] Reference Figure 2 and Figure 5In the mold-opening stage: the hydraulic cylinder 15 drives the sliding block 17 to move away from the connecting cylinder 16. The sliding block 17 drives the sliding ring 9 to move synchronously through the fixed rod 20. The driving block 13 on the sliding ring 9 first abuts against the first abutting block 10 of the first set of hinge rods 8, causing the first set of flared 24 blocks 5 to retract towards the axis and detach from the flared 24 part of the plastic product. The sliding ring 9 continues to move, and its end face abuts against the second abutting block 11 of the second set of hinge rods 8, causing the second set of flared 24 blocks 5 to retract. After the sliding block 17 moves to the limit position, the hydraulic cylinder 15 continues to operate, driving the connecting cylinder 16, the core-pulling block 4, and the retracted flared 24 blocks 5 to retract as a whole, detaching from the tube opening part of the plastic product.

[0043] Reference Figure 2 and Figure 4 Mold closing and reset process: The hydraulic cylinder 15 drives in the reverse direction, first moving the core-pulling block 4 and the flaring block 24 5 forward to the initial position. The sliding ring 9 moves in the reverse direction, sequentially driving the second and first sets of hinge rods 8 to reset, so that the flaring block 24 5 returns to the forming position. The front mold 1 and the rear mold 2 close, and the limiting block 22 re-inserts into the limiting groove 21.

[0044] 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 flaring injection mold for plastic pipes, comprising a front mold (1) and a rear mold (2), characterized in that: It also includes a side core-pulling mechanism (3), which includes a core-pulling block (4), multiple flared (24) blocks (5) and a drive assembly (6). The core-pulling block (4) is slidably connected to the rear mold (2). A connecting ring (7) is slidably connected to the rear mold (2) along the sliding direction of the core-pulling block (4). Multiple hinge rods (8) are rotatably connected to the connecting ring (7) along a direction perpendicular to its axis. The multiple hinge rods (8) correspond to the multiple flared (24) blocks (5) respectively. Multiple flared (24) blocks (5) are fixedly connected to corresponding hinge rods (8). The multiple hinge rods (8) are divided into two groups. The driving component (6) is used to drive the two groups of hinge rods (8) to rotate in sequence and the core-pulling block (4) to slide. During the mold opening process, the driving component (6) drives the two groups of hinge rods (8) to rotate in sequence to demold the flared (24) and then drives the flared (24) blocks (5) and the core-pulling block (4) to move together to demold the tube opening.

2. The secondary flaring injection mold for plastic pipes according to claim 1, characterized in that: Multiple flared (24) blocks (5) are evenly distributed along the circumference of the connecting ring (7), and multiple flared (24) blocks (5) in the same group are respectively arranged adjacent to multiple flared (24) blocks (5) in another group.

3. The secondary flaring injection mold for plastic pipes according to claim 2, characterized in that: The driving assembly (6) includes a sliding ring (9), multiple first abutment blocks (10), multiple second abutment blocks (11), and a driving source (12). The sliding ring (9) is slidably connected to the rear mold (2) along the axial direction of the connecting ring (7). The sliding ring is provided with multiple driving blocks (13), each driving block (13) corresponding to a multiple first abutment blocks (10). The multiple first abutment blocks (10) and the multiple second abutment blocks (11) are respectively fixedly connected to multiple hinge rods (8) of two sets of hinge rods (8). The driving source (12) is used to drive the sliding ring (9) and the first abutment blocks (10) and the second abutment blocks (11). When the sliding block (17) moves toward the core-pulling block (4), the sliding block (17) simultaneously abuts against multiple flared (24) blocks (5). When the sliding ring (9) moves toward the connecting ring (7), multiple abutting blocks first abut against the first abutting block (10), causing a set of hinge rods (8) fixed with the first abutting block (10) to rotate toward the axis of the connecting ring (7). Then, the end face of the sliding ring (9) abuts against multiple second abutting blocks (11), causing a set of hinge rods (8) fixed with the second abutting blocks (11) to rotate toward the axis of the connecting ring (7).

4. The secondary flaring injection mold for plastic pipes according to claim 3, characterized in that: Each of the multiple hinge rods (8) has a clearance groove (14) on its middle section.

5. The secondary flaring injection mold for plastic pipes according to claim 3, characterized in that: The drive source (12) includes a hydraulic cylinder (15), a connecting cylinder (16), and a sliding block (17). The connecting cylinder (16) is slidably connected to the rear mold (2). The connecting ring (7) is fixedly connected inside the connecting cylinder (16). The sliding block (17) is slidably connected inside the connecting cylinder (16). The connecting cylinder (16) is provided with a connecting post (18). The core-pulling block (4) is fixedly connected to the connecting post (18). The connecting cylinder (16) is provided with several sliding rods (19). The sliding block (17) is simultaneously slidably connected to several sliding rods (19). On the moving rod (19), the sliding block (17) is provided with several fixed rods (20). The ends of the fixed rods (20) away from the sliding block (17) are fixedly connected to the sliding ring (9). The oil cylinder (15) is fixedly connected to the rear mold (2). One end of the piston rod of the oil cylinder (15) is fixedly connected to the sliding block (17). When the mold is opened, the oil cylinder (15) drives the sliding block (17) to slide to the limit position away from the connecting cylinder (16). Then, the sliding block (17) drives the connecting cylinder (16) to move together.

6. The secondary flaring injection mold for plastic pipes according to claim 5, characterized in that: The connecting cylinder (16) is provided with a limiting groove (21), and the front mold (1) is provided with a limiting block (22) that can cooperate with the limiting groove (21). When the mold is in the mold closing state, the limiting block (22) cooperates with the limiting groove (21).

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