A mould for producing a plastic tube part for a cover injection sealing ring

Abstract

The present application belongs to the technical field of mould, and particularly relates to a mould for producing plastic pipe fittings with injection-moulded sealing rings, comprising an upper mould and a lower mould, two or more connecting rods being arranged between the upper mould and the lower mould, the axial direction of each connecting rod being arranged in a horizontal direction, a floating core being slidably sleeved on the connecting rod, an inner end face core being slidably sleeved on the outer end of the floating core, and an outer end face core being slidably sleeved on the outer end of the inner end face core, when the mould is closed, an injection-moulding cavity I which is adapted to the joint body is formed between the upper mould, the lower mould, the floating core, the inner end face core and the outer end face core, and the inner end face core is in a first mould closing stroke position; when each inner end face core is moved outward, an injection-moulding cavity II which is adapted to the sealing ring is formed between the joint body, the floating core and the inner end face core, and the inner end face core is in a second mould closing stroke position. The present application can be used for forming plastic pipe fittings with injection-moulded sealing rings.

Description

Technical Field

[0001] This invention belongs to the field of mold technology, and specifically relates to a mold for producing plastic pipe fittings with encapsulated injection-molded sealing rings. Background Technology

[0002] Plastic pipe fittings are typically connected to pipes via a sealing ring. The installation process involves: injection molding the pipe fitting using a mold; placing the sealing ring into a recessed mounting groove within the fitting; and finally, fitting the pipe fitting onto the pipe, with the sealing ring sealing the gap between the fitting and the pipe. However, due to the limitations of the injection mold, several seams are formed on the inner wall of the mounting groove, preventing the sealing ring from fitting tightly against the groove's inner wall. This allows liquid to easily leak through the gap between the sealing ring and the groove's inner wall.

[0003] To prevent liquid leakage through the gap between the sealing ring and the mounting groove, a plastic fitting with an encapsulated injection-molded sealing ring has been developed. This fitting includes an injection-molded connector body 1 with two or more ends. The end faces of the connector body 1 are recessed to form mounting grooves 2. A sealing ring 3 is encapsulated and injection-molded within the mounting grooves 2. The connector body 1 and the sealing ring 3 are an integral structure. Figure 1 , 2 As shown. The sealing ring 3 is injection molded into the mounting groove 2 on the end face of the connector body 1. The connector body 1 and the sealing ring 3 are an integral structure, which effectively prevents liquid from leaking out through the gap between the sealing ring 3 and the mounting groove 2, thus effectively preventing leakage.

[0004] Because plastic pipe fittings with encapsulated injection-molded sealing rings need to have the injection-molded sealing ring encapsulated in the mounting groove on the end face of the connector body, existing injection molds cannot be used to mold plastic pipe fittings with encapsulated injection-molded sealing rings. Summary of the Invention

[0005] The purpose of this invention is to provide a mold for producing plastic pipe fittings with encapsulated injection-molded sealing rings, which can be used to mold plastic pipe fittings with encapsulated injection-molded sealing rings.

[0006] The objective of this invention is achieved as follows:

[0007] A mold for producing plastic pipe fittings with encapsulated injection-molded sealing rings includes an upper mold and a lower mold. Two or more connecting rods are provided between the upper and lower molds, with each connecting rod axially arranged horizontally. A floating core is slidably fitted onto each connecting rod. An inner end face core is slidably fitted onto the outer end of the floating core, and an outer end face core is slidably fitted onto the outer end face core. After mold closing, when an injection cavity matching the connector body is formed between the upper mold, lower mold, floating core, inner end face core, and outer end face core, the inner end face core is in a first mold closing stroke position. When each inner end face core is moved outwards, forming an injection cavity matching the sealing ring between the connector body, floating core, and inner end face core, the inner end face core is in a second mold closing stroke position.

[0008] In the aforementioned mold for producing plastic pipe fittings with encapsulated injection-molded sealing rings, the outer end of the inner end face core is provided with a first mounting sleeve that slides on the connecting rod, and the outer end face core is provided with a second mounting sleeve that is fitted on the connecting rod. The first mounting sleeve is located between the floating core and the second mounting sleeve. When the inner end face core moves inward, the first mounting sleeve abuts against the floating core and pushes the floating core to move inward together until the inner end face core is at the first mold closing stroke position. The inner end face core moves outward until it is at the second mold closing stroke position. After the mold opens, the inner end face core continues to move outward, and the first mounting sleeve abuts against the second mounting sleeve and pushes the outer end face core to move outward together.

[0009] In the above-mentioned mold for producing plastic pipe fittings with encapsulated injection sealing rings, the inner end of the connecting rod is provided with a boss protruding from the outer wall of the connecting rod, and the inner wall of the inner end of the floating core is provided with a groove for the boss to slide. After the mold is opened, when the connecting rod moves outward, the boss pushes the floating core to move outward together when it comes into contact with the floating core.

[0010] In the above-mentioned mold for producing plastic pipe fittings with encapsulated injection-molded sealing rings, the floating core includes an outer floating core and an inner floating core that are slidably mounted on a connecting rod from the outside to the inside. The upper mold, lower mold, inner floating core, inner end face core, and outer end face core form the first injection cavity. The joint body, outer floating core, inner floating core, and inner end face core form the second injection cavity. The outer floating core and inner floating core form the third injection cavity that is adapted to the sealing lip disposed in the inner ring of the sealing ring.

[0011] In the above-mentioned mold for producing plastic pipe fittings with encapsulated injection-molded sealing rings, the floating core includes an outer floating core, a middle floating core, and an inner floating core that are slidably mounted on a connecting rod from the outside to the inside. The upper mold, lower mold, inner floating core, inner end face core, and outer end face core form the first injection cavity. The joint body, outer floating core, middle floating core, inner floating core, and inner end face core form the second injection cavity. The outer floating core and the middle floating core, as well as the middle floating core and the inner floating core, each form a third injection cavity that matches the sealing lip disposed in the inner ring of the sealing ring.

[0012] In the above-mentioned mold for producing plastic pipe fittings with encapsulated injection sealing rings, there are two or more intermediate floating cores, and an injection cavity adapted to the sealing lip is formed between two adjacent intermediate floating cores.

[0013] In the aforementioned mold for producing plastic pipe fittings with encapsulated injection-molded sealing rings, the outer end of the mounting sleeve two is provided with a mounting block located outside the connecting rod. The mounting block is fixedly connected to the connecting rod. A sliding block is slidably provided at the outer end of the mounting block along the sliding direction of the mounting block. The sliding block is fixedly connected to the mounting sleeve one via a pull rod. A push block is slidably provided inside the sliding block along the sliding direction of the sliding block. A push block driven by a power device is fixed at the outer end of the push block. A locking block is slidably provided vertically inside the sliding block. The mounting block is provided with a locking groove for the locking block to enter. When the locking block does not enter the locking groove, the sliding block moves together with the push block and slides inside the mounting block. When the locking block enters the locking groove, the mounting block and the sliding block lock together and move together with the sliding block. When the push block abuts against the sliding block, it pushes the sliding block to move inward.

[0014] In the aforementioned mold for producing plastic pipe fittings with encapsulated injection-molded sealing rings, the outer end face core, mounting sleeve two, and mounting block are an integral structure, and the inner end face core and mounting sleeve one are an integral structure.

[0015] In the above-mentioned mold for producing plastic pipe fittings with encapsulated injection sealing rings, the mounting block and the connecting rod are fixedly connected by screws passing through the mounting block and threaded onto the connecting rod.

[0016] In the above-mentioned mold for producing plastic pipe fittings with encapsulated injection sealing rings, the fixed connection method between the push block and the push block is: the screw passes through the push block and is screwed to the push block.

[0017] In the aforementioned mold for producing plastic pipe fittings with encapsulated injection-molded sealing rings, the power unit is a hydraulic cylinder, a linear motor, or a pneumatic cylinder. In this embodiment, the power unit is a hydraulic cylinder.

[0018] In the above-mentioned mold for producing plastic pipe fittings with encapsulated injection sealing rings, the push block has an inclined groove on its side, and the locking block has a sliding block protruding from the push block and sliding in the groove. The locking block moves vertically into and out of the locking groove during the sliding of the sliding block relative to the groove.

[0019] In the above-mentioned mold for producing plastic pipe fittings with encapsulated injection sealing rings, there are two locking blocks, located on both sides of the push block. The two sides of the push block are respectively provided with inclined grooves, and the inclination directions of the two grooves are opposite.

[0020] In the aforementioned mold for producing plastic pipe fittings with encapsulated injection-molded sealing rings, the mold has two injection cavities, two push blocks are fixed on the same push block, and are driven by the same power device.

[0021] In the above-mentioned mold for producing plastic pipe fittings with encapsulated injection sealing rings, the mounting sleeve 2 is provided with a limiting groove, and the upper mold is provided with a limiting block that matches the limiting groove. When the mold is closed, the limiting block is located in the limiting groove to restrict the movement of the mounting sleeve 2.

[0022] In the above-mentioned mold for producing a plastic pipe fitting with an encapsulated injection seal ring, the inner end of the inner end face core protrudes a protrusion towards the connector body, and an injection flow channel for the injection seal ring is formed at the protrusion when the connector body is formed.

[0023] In the aforementioned mold for producing plastic pipe fittings with encapsulated injection-molded sealing rings, a main flow channel and a branch flow channel are provided between the upper mold and the lower mold, and the branch flow channel is connected to the injection flow channel.

[0024] In the aforementioned mold for producing plastic pipe fittings with encapsulated injection sealing rings, the inner end face core is provided with an axially penetrating through groove, and a slider is slidably disposed in the through groove. When the inner end face core is in the first mold closing stroke position, the slider moves outward under the action of injection pressure, forming a fixed protrusion disposed in the mounting groove at the inner end of the through groove; when the inner end face core is in the second mold closing stroke position, the slider resets and seals the inner end of the through groove.

[0025] In the aforementioned mold for producing plastic pipe fittings with encapsulated injection-molded sealing rings, multiple through grooves and sliders are evenly distributed around the circumference.

[0026] In the aforementioned mold for producing plastic pipe fittings with encapsulated injection-molded sealing rings, the upper mold is mounted on an upper mold base, and the lower mold is mounted on a lower mold base.

[0027] The outstanding and beneficial technical effects of this invention compared to the prior art are:

[0028] 1. The present invention forms an injection cavity one for the injection joint body by an upper mold, a lower mold, a floating core, an inner end face core, and an outer end face core; then the inner end face core is moved outward to form an injection cavity two for the injection sealing ring between the joint body, the floating core, and the inner end face core. The structure is ingeniously designed and can form plastic pipe fittings with encapsulated injection sealing rings.

[0029] 2. The floating core of the present invention includes an outer floating core, a middle floating core and an inner floating core that are slidably fitted onto the connecting rod from the outside to the inside, effectively preventing the floating core from shearing the sealing lip during outward movement;

[0030] 3. The present invention has an ingenious structural design, which completes the movement of all parts through a single power device, effectively saving power devices and simplifying the structure. Attached Figure Description

[0031] Figure 1 This is a cross-sectional view of the plastic tubing of the present invention;

[0032] Figure 2 This is a perspective view of the connector body of the present invention;

[0033] Figure 3 This is a cross-sectional view of the present invention in the first mold closing stroke position without plastic tubing;

[0034] Figure 4 This is a cross-sectional view of the present invention in the second mold closing stroke position without plastic tubing;

[0035] Figure 5 This is a cross-sectional view of the present invention in the mold-open state;

[0036] Figure 6 This is a perspective view of the present invention at the first mold closing stroke position;

[0037] Figure 7 This is a perspective view of the present invention at the second mold closing stroke position;

[0038] Figure 8 This is a perspective view of the mold of the present invention in the mold-open state;

[0039] Figure 9 This is a perspective view of the upper mold of the present invention in the mold-opening state;

[0040] Figure 10 This is a perspective view of the connection structure between the sliding block, the mounting sleeve, and the push block of the present invention.

[0041] Figure 11 This is a perspective view of the inner end face core and slider of the present invention.

[0042] Reference numerals: 1. Connector body; 2. Mounting groove; 3. Sealing ring; 4. Sealing lip; 5. Injection runner; 6. Fixing protrusion; 11. Upper mold; 12. Lower mold; 13. Connecting rod; 14. Inner end face core; 15. Outer end face core; 16. Injection cavity one; 17. Injection cavity two; 18. Mounting sleeve one; 19. Mounting sleeve two; 20. Boss; 21. Groove; 22. Outer floating core; 23. Inner floating core 24. Moving core; 25. Injection cavity three; 26. Intermediate floating core; 27. Mounting block; 28. Sliding block; 29. ​​Tie rod; 30. Push block; 31. Locking block; 32. Locking groove; 33. Sliding groove; 34. Sliding block; 35. Limiting groove; 36. Limiting block; 37. Protrusion; 38. Through groove; 39. Slider; 40. Main runner; 41. Sub-runner; 42. Upper mold base; 43. Lower mold base. Detailed Implementation

[0043] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. See also: Figure 1 —11:

[0044] A mold for producing plastic pipe fittings with encapsulated injection-molded sealing rings includes an upper mold 11 and a lower mold 12. Two or more connecting rods 13 are provided between the upper mold 11 and the lower mold 12. The axial direction of each connecting rod 13 is horizontal. A floating core is slidably fitted on each connecting rod 13. An inner end face core 14 is slidably fitted on the outer end of the floating core. An outer end face core 15 is slidably fitted on the outer end of the inner end face core 14. After mold closing, when an injection cavity 16 adapted to the connector body 1 is formed between the upper mold 11, lower mold 12, floating core, inner end face core 14, and outer end face core 15, the inner end face core 14 is in the first mold closing stroke position. When each inner end face core 14 is moved outwards, and an injection cavity 17 adapted to the sealing ring 3 is formed between the connector body 1, floating core, and inner end face core 14, the inner end face core 14 is in the second mold closing stroke position.

[0045] In this embodiment, "inward" refers to the inside of the mold, and "outward" refers to the outside of the mold. The inner end refers to the end closest to the inside of the mold, and the outer end refers to the end closest to the outside of the mold.

[0046] This invention forms the injection cavity 16 of the injection joint body 1 using an upper mold 11, a lower mold 12, a floating core, an inner end face core 14, and an outer end face core 15, as shown below. Figure 3 As shown; then the inner end face core 14 is moved outward, forming an injection cavity 17 for the injection sealing ring 3 between the connector body 1, the floating core, and the inner end face core 14, as shown. Figure 4 As shown. The present invention has an ingenious structural design and is capable of molding plastic tubing with an encapsulated injection-molded sealing ring.

[0047] The number of connecting rods 13 is adapted to the number of ends of the plastic pipe fitting. In this embodiment, the plastic pipe fitting has two ends, and two connecting rods 13 are provided between the upper mold 11 and the lower mold 12.

[0048] The inward moving structure of the floating core and the outward moving structure of the outer end face core 15: such as Figure 3-5 As shown, the inner end face core 14 has a mounting sleeve 18 that slides on the connecting rod 13 at its outer end, and the outer end face core 15 has a mounting sleeve 2 19 that is fitted on the connecting rod 13 at its outer end. The mounting sleeve 18 is located between the floating core and the mounting sleeve 2 19. When the inner end face core 14 moves inward, the mounting sleeve 18 abuts against the floating core and pushes the floating core to move inward together until the inner end face core 14 is at the first mold closing stroke position. The inner end face core 14 moves outward until it is at the second mold closing stroke position. After the mold opens, the inner end face core 14 continues to move outward, and the mounting sleeve 18 abuts against the mounting sleeve 2 19 and pushes the outer end face core 15 to move outward together.

[0049] Floating core outward movement structure: The inner end of the connecting rod 13 is provided with a boss 20 protruding from the outer wall of the connecting rod 13, and the inner wall of the inner end of the floating core is provided with a groove 21 for the boss 20 to slide. After the mold is opened, when the connecting rod 13 moves outward, the boss 20 pushes the floating core to move outward together when it comes into contact with the floating core.

[0050] When there is only one sealing lip 4, to prevent the floating core from shearing the sealing lip 4 during the outward movement of the floating core after mold opening, the floating core includes an outer floating core 22 and an inner floating core 23 that are sequentially slidably fitted onto the connecting rod 13 from the outside to the inside. The upper mold 11, lower mold 12, inner floating core 23, inner end face core 14, and outer end face core 15 form the first injection cavity 16. The joint body 1, outer floating core 22, inner floating core 23, and inner end face core 14 form the second injection cavity 17. The outer floating core 22 and inner floating core 23 form the third injection cavity 24 that matches the sealing lip 4 located in the inner ring of the sealing ring 3. Figure 5 As shown, during the outward movement of the floating core, the sealing lip 4 provides resistance to the inner floating core 23, creating a gap between the outer floating core 22 and the inner floating core 23. This allows the sealing lip 4 to have more room to move and prevents it from being cut off by being clamped by the floating core.

[0051] When there are two or more sealing lips 4, to prevent the floating core from shearing the sealing lip 4 during the outward movement of the floating core after mold opening, the floating core includes an outer floating core 22, a middle floating core 25, and an inner floating core 23 that are sequentially slidably fitted onto the connecting rod 13 from the outside to the inside. The upper mold 11, lower mold 12, inner floating core 23, inner end face core 14, and outer end face core 15 form the first injection cavity 16. The joint body 1, outer floating core 22, middle floating core 25, inner floating core 23, and inner end face core 14 form the second injection cavity 17. The outer floating core 22 and the middle floating core 25, and the middle floating core 25 and the inner floating core 23, each form an injection cavity 24 that matches the sealing lip 4 located in the inner ring of the sealing ring 3. Figure 5 As shown, during the outward movement of the floating core, the sealing lip 4 provides resistance to the inner floating core 23 and the middle floating core 25, creating gaps between the outer floating core 22 and the middle floating core 25, and between the middle floating core 25 and the inner floating core 23. This allows each sealing lip 4 to have more room to move and prevents it from being cut off by being clamped by the floating core.

[0052] When there are three or more sealing lips 4, there are two or more intermediate floating cores 25, and an injection cavity 3 24 adapted to the sealing lip 4 is formed between two adjacent intermediate floating cores 25.

[0053] In this embodiment, there are two sealing lips 4 and one intermediate floating core 25.

[0054] The movable structure for installing sleeve 18 and sleeve 29: such as Figure 3-10 As shown, the outer end of the second mounting sleeve 19 is provided with a mounting block 26 located outside the connecting rod 13. The mounting block 26 is fixedly connected to the connecting rod 13. A sliding block 27 is slidably provided on the outer end of the mounting block 26 along the sliding direction of the mounting block 26. The sliding block 27 is fixedly connected to the first mounting sleeve 18 through a pull rod 28. A push block 29 is slidably provided inside the sliding block 27 along the sliding direction of the sliding block 27. A push block 30 driven by a power device is fixed on the outer end of the push block 29. A locking block 31 is vertically slidably disposed inside the sliding block 27. The mounting block 26 is provided with a locking groove 32 for the locking block 31 to enter. When the locking block 31 does not enter the locking groove 32, the sliding block 27 moves together with the push block 29 and is slidably disposed inside the mounting block 26. When the locking block 31 enters the locking groove 32, the mounting block 26 and the sliding block 27 are locked together and move together with the sliding block 27. When the push block 30 abuts against the sliding block 27, it pushes the sliding block 27 to move inward.

[0055] Furthermore, the outer end face core 15, mounting sleeve 29, and mounting block 26 are an integral structure, and the inner end face core 14 and mounting sleeve 18 are an integral structure.

[0056] The fixing connection method between mounting block 26 and connecting rod 13 is as follows: Figure 3-5 As shown, the screw passes through the mounting block 26 and is threaded onto the connecting rod 13.

[0057] The fixed connection method between push block 29 and push block 30 is as follows: Figure 3-5 As shown, the screw passes through the push block 30 and is screwed to the push block 29.

[0058] Preferably, the power unit is a hydraulic cylinder, a linear motor, or a pneumatic cylinder. In this embodiment, the power unit is a hydraulic cylinder, and the piston rod of the hydraulic cylinder is connected to the push block 30.

[0059] The installation structure of locking block 31 and push block 29: The push block 29 is provided with an inclined sliding groove 33 on its side. The locking block 31 protrudes to the side of the push block 29 and has a sliding block 34 that slides in the sliding groove 33. During the sliding process of the sliding block 34 relative to the sliding groove, the locking block 31 moves vertically into and out of the locking groove 32.

[0060] In this embodiment, the slide 33 has a horizontal groove at one end near the push block 30.

[0061] When the sliding block 34 is located in the slide groove 33, and the locking block 31 is located in the corresponding position of the locking groove 32 and can move vertically, the sliding block 34 moves vertically along the slide groove 33; when the locking block 31 leaves the locking groove 32 and cannot move vertically, because the slide groove 33 is inclined, the sliding block 34 is pushed by the slide groove 33 and moves together with the push block 29, so the locking block 31 and the sliding block 27 move together with the push block 29; when the sliding block 34 is located in the horizontal groove, the push block 29 can move horizontally relative to the sliding block 34.

[0062] In order to better drive the locking block 31 to move and to better lock the mounting block 26, the locking block 31 is provided in two places, located on both sides of the push block 29. The two sides of the push block 29 are respectively provided with inclined grooves 33, and the two grooves 33 are inclined in opposite directions.

[0063] Furthermore, the mold has two injection cavities, and the two push blocks 29 are fixed on the same push block 30 and driven by the same power device.

[0064] To lock the mounting sleeve 2 19 in the mold-closed state and prevent it from sliding, such as Figure 3-5 As shown in Figure 9, the mounting sleeve 19 is provided with a limiting groove 35, and the upper mold 11 is provided with a limiting block 36 that is adapted to the limiting groove 35. When the mold is closed, the limiting block 36 is located in the limiting groove 35 to restrict the movement of the mounting sleeve 19.

[0065] To form the injection flow channel 5 of the injection seal ring 3, such as Figure 11As shown, the inner end of the inner end core 14 has a protrusion 37 protruding from the inner end towards the connector body 1. When the connector body 1 is formed, an injection flow channel 5 for injection molding sealing ring 3 is formed at the protrusion 37.

[0066] Furthermore, a main runner 40 and a branch runner 41 are provided between the upper mold 11 and the lower mold 12, and the branch runner 41 is connected to the injection runner 5.

[0067] To form the fixing protrusion 6 set in the mounting groove 2, such as Figure 11 As shown, the inner end face core 14 has an axially penetrating through groove 38. A slider 39 slides within the through groove 38. When the inner end face core 14 is in the first mold closing stroke position, the slider 39 moves outward under the action of injection pressure, forming a fixed protrusion 6 in the mounting groove 2 at the inner end of the through groove 38. When the inner end face core 14 is in the second mold closing stroke position, the slider 39 resets and seals the inner end of the through groove 38. When the inner end face core 14 is in the first mold closing stroke position, during injection into the injection cavity 16, the injection pressure pushes the slider 39 outward, forming the fixed protrusion 6 at the inner end of the through groove 38. During the outward movement of the inner end face core 14, the slider 39 abuts against the mounting sleeve 19 and moves inward relative to the inner end face core 14, resetting its position.

[0068] Furthermore, the through slots 38 and sliders 39 are evenly distributed around their circumferences.

[0069] Furthermore, the upper mold 11 is mounted on the upper mold base 42, and the lower mold 12 is mounted on the lower mold base 43.

[0070] The working principle of this invention: Mold closing process: The power device drives the push block 30 to move inward, which in turn drives the push block 29 to move inward. At this time, the locking block 31 has not entered the locking groove 32. The sliding block 27 moves inward together with the push block 29, which drives the mounting sleeve 18 to move inward. Until the locking block 31 moves vertically into the locking groove 32 under the action of the sliding block 34, the mounting block 26 and the sliding block 27 lock together and move inward together with the sliding block 27. The connecting rod 13, which is fixedly connected to the mounting block 26, also moves inward synchronously. The push block 30 and the sliding block 27 abut against each other, pushing the sliding block 27 to continue moving inward. At the same time, the floating core abuts against the mounting sleeve 18 and moves inward synchronously until each inner end face core 14 is in the first mold closing stroke position. The upper mold 11 moves down to close the mold. The limiting block 36 set on the upper mold 11 is located in the limiting groove 35 to restrict the movement of the mounting sleeve 19. Figure 3 , 6As shown; after injection molding the joint body 1, the power unit drives the push block 30 to move outward, which in turn moves the push block 29 outward. Since the installation sleeve 19 is restricted from moving by the upper mold 11, that is, the installation block 26 is restricted from moving, the locking block 31 moves vertically away from the locking groove 32. Under the action of the sliding block 34 and the sliding groove 33, the sliding block 27 moves outward along with the push block 29, which in turn moves the installation sleeve 18 and the inner end face core 14 outward until the inner end face core 14 is in the second mold closing stroke position, as shown. Figure 4 , 7 As shown; after the injection molding of the sealing ring 3, the upper mold 11 moves upward to open the mold, the limiting block 36 leaves the limiting groove 35, the mounting sleeve 2 19 can move, the power device drives the pushing block 30 to move outward, driving the pushing block 29 and the sliding block 27 to move outward, the mounting sleeve 1 18 and the mounting sleeve 2 19 abut against each other and push the outer end face core 15 to move outward together, at the same time driving the connecting rod 13 to move outward, the boss 20 abuts against the floating core and pushes the floating core to move outward together, as shown. Figure 5-8 As shown.

[0071] The above embodiments are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A mold for producing plastic pipe fittings with encapsulated injection-molded sealing rings, characterized in that: The system includes an upper mold (11) and a lower mold (12). Two or more connecting rods (13) are provided between the upper mold (11) and the lower mold (12). The axial direction of each connecting rod (13) is horizontal. A floating core is slidably fitted on the connecting rod (13). An inner end face core (14) is slidably fitted on the outer end of the floating core. An outer end face core (15) is slidably fitted on the outer end face core (14). After the mold is closed, when the upper mold (11), lower mold (12), floating core, inner end face core (14), and outer end face core (15) form an injection cavity one (16) that is compatible with the joint body (1), the inner end face core (14) is in the first mold closing stroke position. When each inner end face core (14) is moved outward, an injection cavity two that is compatible with the sealing ring (3) is formed between the joint body (1), floating core, and inner end face core (14). (17) When the inner end face core (14) is in the second mold closing stroke position, the outer end of the inner end face core (14) is provided with a first mounting sleeve (18) that is slidably fitted on the connecting rod (13), and the outer end of the outer end face core (15) is provided with a second mounting sleeve (19) fitted on the connecting rod (13). The first mounting sleeve (18) is located between the floating core and the second mounting sleeve (19). When the inner end face core (14) moves inward, the first mounting sleeve (18) and the floating core come into contact and push the floating core to move inward together until the inner end face core (14) is in the first mold closing stroke position. When the inner end face core (14) moves outward, the inner end face core (14) is in the second mold closing stroke position. After the mold is opened, the inner end face core (14) continues to move outward, and the first mounting sleeve (18) and the second mounting sleeve (19) come into contact and push the outer end face core (15) to move outward together.

2. The mold for producing plastic pipe fittings with encapsulated injection-molded sealing rings according to claim 1, characterized in that: The inner end of the connecting rod (13) is provided with a boss (20) protruding from the outer wall of the connecting rod (13). The inner wall of the inner end of the floating core is provided with a groove (21) for the boss (20) to slide. After the mold is opened, when the connecting rod (13) moves outward, the boss (20) pushes the floating core to move outward together when it comes into contact with the floating core.

3. The mold for producing plastic pipe fittings with encapsulated injection-molded sealing rings according to claim 2, characterized in that: The floating core includes an outer floating core (22) and an inner floating core (23) that are slidably mounted on the connecting rod (13) from the outside to the inside. The upper mold (11), lower mold (12), inner floating core (23), inner end face core (14), and outer end face core (15) form the first injection cavity (16). The joint body (1), outer floating core (22), inner floating core (23), and inner end face core (14) form the second injection cavity (17). The outer floating core (22) and inner floating core (23) form the third injection cavity (24) that is adapted to the sealing lip (4) set in the inner ring of the sealing ring (3).

4. A mold for producing plastic pipe fittings with encapsulated injection-molded sealing rings according to claim 2, characterized in that: The floating core includes an outer floating core (22), a middle floating core (25), and an inner floating core (23) that are slidably mounted on the connecting rod (13) from the outside to the inside. The upper mold (11), the lower mold (12), the inner floating core (23), the inner end face core (14), and the outer end face core (15) form the first injection cavity (16). The joint body (1), the outer floating core (22), the middle floating core (25), the inner floating core (23), and the inner end face core (14) form the second injection cavity (17). The outer floating core (22) and the middle floating core (25), and the middle floating core (25) and the inner floating core (23) each form an injection cavity (24) that is adapted to the sealing lip (4) set in the inner ring of the sealing ring (3).

5. A mold for producing plastic pipe fittings with encapsulated injection-molded sealing rings according to claim 2, characterized in that: The outer end of the second mounting sleeve (19) is provided with a mounting block (26) located outside the connecting rod (13). The mounting block (26) is fixedly connected to the connecting rod (13). A sliding block (27) is slidably provided on the outer end of the mounting block (26) along the sliding direction of the mounting block (26). The sliding block (27) is fixedly connected to the first mounting sleeve (18) through a pull rod (28). A push block (29) is slidably provided inside the sliding block (27) along the sliding direction of the sliding block (27). A push block (30) driven by a power device is fixed on the outer end of the push block (29). (27) A locking block (31) is vertically slidably provided on the inner edge. The mounting block (26) is provided with a locking groove (32) for the locking block (31) to enter. When the locking block (31) does not enter the locking groove (32), the sliding block (27) moves together with the push block (29) and the sliding block (27) slides in the mounting block (26). When the locking block (31) enters the locking groove (32), the mounting block (26) locks with the sliding block (27) and moves together with the sliding block (27). When the push block (30) abuts against the sliding block (27), it pushes the sliding block (27) to move inward.

6. A mold for producing plastic pipe fittings with encapsulated injection-molded sealing rings according to claim 5, characterized in that: The push block (29) has an inclined groove (33) on its side. The locking block (31) has a sliding block (34) protruding from the push block (29) and sliding in the groove (33). The locking block (31) moves vertically into and out of the locking groove (32) during the sliding of the sliding block (34) relative to the groove (33).

7. A mold for producing plastic pipe fittings with encapsulated injection-molded sealing rings according to claim 5, characterized in that: The mounting sleeve 2 (19) is provided with a limiting groove (35), and the upper mold (11) is provided with a limiting block (36) that is adapted to the limiting groove (35). When the mold is closed, the limiting block (36) is located in the limiting groove (35) to restrict the movement of the mounting sleeve 2 (19).

8. A mold for producing plastic pipe fittings with encapsulated injection-molded sealing rings according to claim 1, characterized in that: The inner end of the core (14) has a protrusion (37) protruding from the inner end towards the connector body (1). When the connector body (1) is formed, an injection channel (5) for injection molding of the sealing ring (3) is formed at the protrusion (37).

9. A mold for producing plastic pipe fittings with encapsulated injection-molded sealing rings according to claim 1, characterized in that: The inner end face core (14) is provided with an axial through groove (38), and a slider (39) is slidably provided in the through groove (38). When the inner end face core (14) is in the first mold closing stroke position, the slider (39) moves outward under the action of injection pressure and forms a fixed protrusion (6) in the mounting groove (2) at the inner end of the through groove (38). When the inner end face core (14) is in the second mold closing stroke position, the slider (39) resets and seals the inner end of the through groove (38).

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