Plastic pipe joint injection mold with spiral core water sealing device

Abstract

A plastic pipe joint injection mold with a spiral core water sealing device comprises an upper compound plate and a lower compound plate, a fixed mold plate, a fixed mold insert and a fixed mold core are arranged below the upper compound plate, a base plate is arranged on the lower compound plate, a motor and a lower mold plate are arranged on the base plate, a middle mold plate is arranged on the lower mold plate, an upper mold plate is arranged on the lower mold plate, and driving shafts are arranged in the upper mold plate, the middle mold plate and the lower mold plate. A driving gear is arranged on the outer wall of the driving shaft, a movable mold plate is arranged on the upper mold plate, a movable mold insert is arranged on the movable mold plate, spiral cores are arranged in the movable mold insert, the movable mold plate, the upper mold plate, the middle mold plate and the lower mold plate, a driven gear is arranged on the outer wall of each spiral core, a water inlet hole and a water outlet hole are formed in the lower mold plate, and a cooling water path is arranged in each spiral core. A sealing ring and an upper sealing gasket made of graphite materials are arranged below the spiral core, an outer sleeve is arranged outside the sealing ring and the upper sealing gasket, a water sealing groove is formed in the upper portion of the lower die plate, a lower sealing gasket made of graphite materials is arranged in the water sealing groove, and the lower sealing gasket is in rotating contact with the upper sealing gasket.

Description

Technical Field

[0001] The utility model relates to an injection mold, in particular to an injection mold for a plastic pipe joint with a water sealing device for a spiral core. Background Art

[0002] When manufacturing a plastic pipe joint by an injection mold, since internal threads are formed on the inner wall of the pipe joint, after the pipe joint is injection molded, a spiral core needs to be rotated by power to make the spiral core rotate out of the internal threads of the pipe joint. In order to enable the spiral core to be quickly cooled, a water inlet and a water outlet are opened in the template, a cooling water channel is opened inside the spiral core, and the spiral core is inserted into the template to make the cooling water channel communicate with the water inlet and the water outlet. In order to prevent the cooling water from leaking from the gap between the spiral core and the template, a water sealing structure needs to be provided between the spiral core and the template. The existing technology usually sets a sealing ring made of rubber material on the outer wall of one end of the spiral core located in the template. The sealing ring is fixed to the spiral core, and the outer wall of the sealing ring is in sealed contact with the inner wall of the template. The water between the spiral core and the template is sealed through the sealing ring. However, the disadvantage of this structure is that since the spiral core needs to rotate back and forth continuously, the spiral core drives the sealing ring to rotate together. The sealing ring is prone to deformation, wear and aging, and has a short service life. After deformation, wear and aging, the water sealing effect is affected. Therefore, it needs to be replaced frequently, and the operation is very troublesome. Summary of the Invention

[0003] The purpose of the utility model is to overcome the disadvantages of the existing technology and provide an injection mold for a plastic pipe joint with a water sealing device for a spiral core, which has good water sealing effect, good lubrication performance, small friction coefficient, wear resistance and long service life.

[0004] The technical solution of an injection mold for a plastic pipe joint with a spiral core water sealing device of the present utility model is as follows: It includes an upper clamping plate and a lower clamping plate. A fixed mold plate is arranged under the upper clamping plate, a fixed mold insert is arranged in the fixed mold plate, a fixed mold core is arranged in the fixed mold insert, a backing plate is arranged on the lower clamping plate, a motor and a lower mold plate are arranged on the backing plate, a middle mold plate is arranged on the lower mold plate, and an upper mold plate is arranged on the middle mold plate. A driving shaft is arranged in the upper mold plate, the middle mold plate and the lower mold plate, and the driving shaft is driven to rotate by the motor. A driving gear is arranged on the outer wall of the driving shaft in the middle mold plate. A movable mold plate is arranged on the upper mold plate, and a movable mold insert is arranged on the movable mold plate. A spiral core is arranged in the movable mold insert, the movable mold plate, the upper mold plate, the middle mold plate and the lower mold plate. A driven gear is arranged on the outer wall of the spiral core in the middle mold plate, and the driven gear meshes with the driving gear. There is an injection-molded plastic pipe joint between the fixed mold insert, the fixed mold core, the movable mold insert and the spiral core. An inlet hole and an outlet hole for cooling water are made in the lower mold plate, and a cooling water channel is made in the spiral core. The cooling water channel communicates with the inlet hole and the outlet hole. A sealing ring made of rubber material is arranged on the lower outer wall of the spiral core, an upper sealing pad made of graphite material is arranged below the sealing ring, and an outer sleeve is arranged outside the sealing ring and the upper sealing pad. A sealing groove is made in the upper part of the lower mold plate where the inlet hole and the outlet hole are located, and a lower sealing pad made of graphite material is arranged in the sealing groove. The upper end of the lower sealing pad is in rotational contact with the lower end of the upper sealing pad.

[0005] Further, a convex ring is made at the lower end of the upper sealing pad, and the lower end of the convex ring is in rotational contact with the upper end of the lower sealing pad.

[0006] Further, an inward flanging is made on the outer sleeve, an outward flanging is made on the sealing ring, a spring is arranged in the outer sleeve, the upper end of the spring is in contact with the inward flanging of the outer sleeve, and the lower end of the spring is in contact with the outward flanging of the sealing ring.

[0007] Further, an O-ring is arranged between the lower sealing pad and the inner wall of the sealing groove.

[0008] The beneficial effect of an injection mold for a plastic pipe joint with a spiral core water sealing device of the present utility model is as follows: By arranging a sealing ring made of rubber material and an upper sealing pad made of graphite material on the lower outer wall of the spiral core, and arranging a lower sealing pad made of graphite material in the sealing groove of the lower mold plate, and the upper sealing pad and the lower sealing pad are in rotational sealing contact. Since the graphite material has good lubrication performance, a small friction coefficient and good wear resistance, its service life is longer on the premise of ensuring the sealing performance between the spiral core and the lower mold plate. Description of the Drawings

[0009] Figure 1 It is a schematic structural diagram of an injection mold for a plastic pipe joint with a spiral core water sealing device of the present utility model;

[0010] Figure 2Yes Figure 1 Schematic cross-sectional view in the A-A direction of

[0011] Figure 3 Yes Figure 1 Schematic cross-sectional view in the B-B direction of

[0012] Figure 4 Yes Figure 3 Schematic enlarged view of the local part at C of Detailed implementation mode

[0013] The utility model relates to an injection mold for a plastic pipe joint with a spiral core water sealing device. As shown in Figures Figure 1 — Figure 4 , it includes an upper platen 1 and a lower platen 2. A fixed template 3 is arranged under the upper platen 1. A fixed mold insert 4 is arranged in the fixed template 3. A fixed mold core 17 is arranged in the fixed mold insert 4. A backing plate 5 is arranged on the lower platen 2. A motor 6 and a lower template 7 are arranged on the backing plate 5. A middle template 9 is arranged on the lower template 7. An upper template 10 is arranged on the middle template 9. A driving shaft 11 is arranged in the upper template 10, the middle template 9 and the lower template 7. The driving shaft 11 is driven to rotate by the motor 6. A driving gear 12 is arranged on the outer wall of the driving shaft 11 in the middle template 9. A moving template 13 is arranged on the upper template 10. A moving mold insert 14 is arranged on the moving template 13. A spiral core 15 is arranged in the moving mold insert 14, the moving template 13, the upper template 10, the middle template 9 and the lower template 7. A driven gear 16 is arranged on the outer wall of the spiral core 15 in the middle template 9. The driven gear 16 meshes with the driving gear 12. There is an injection-molded plastic pipe joint 18 between the fixed mold insert 4, the fixed mold core 17, the moving mold insert 14 and the spiral core 15. An inlet hole 21 and an outlet hole 22 for cooling water are made in the lower template 7. A cooling water channel 23 is made in the spiral core 15. The cooling water channel 23 communicates with the inlet hole 21 and the outlet hole 22. A sealing ring 24 made of rubber material is arranged on the lower outer wall of the spiral core 15. An upper sealing pad 25 made of graphite material is arranged below the sealing ring 24. An outer sleeve 26 is arranged outside the sealing ring 24 and the upper sealing pad 25. A sealing groove 27 is made in the upper part of the lower template 7 where the inlet hole 21 and the outlet hole 22 are located. A lower sealing pad 28 made of graphite material is arranged in the sealing groove 27. The upper end of the lower sealing pad 28 is in rotational contact with the lower end of the upper sealing pad 25.

[0014] Furthermore, a convex ring 29 is made at the lower end of the upper sealing pad 25. The lower end of the convex ring 29 is in rotational contact with the upper end of the lower sealing pad 28.

[0015] ​Further, an inward turned edge 30 is formed on the outer sleeve 26, and an outward turned edge 31 is formed on the sealing ring 24. A spring 32 is arranged in the outer sleeve 26. The upper end of the spring 32 contacts the inward turned edge 30 of the outer sleeve 26, and the lower end of the spring 32 contacts the outward turned edge 31 of the sealing ring 24. When there is wear between the convex ring 29 under the upper gasket 25 and the upper contact surface of the lower gasket 28, the spring 32 presses against the outward turned edge 31 of the sealing ring 24, and the sealing ring 24 pushes the upper gasket 25 downward, so that the upper gasket 25 and the lower gasket 28 can always maintain a sealed contact, increasing the service life of the upper and lower gaskets 25 and 28.

[0016] Further, an O-ring 33 is arranged between the lower gasket 28 and the inner wall of the water sealing groove 27. Since the lower gasket 28 is fixed, arranging the O-ring 33 between the lower gasket 28 and the water sealing groove 27 improves the sealing performance between the lower gasket 28 and the water sealing groove 27.

[0017] The utility model discloses an injection mold for a plastic pipe joint with a spiral core water sealing device. After the plastic pipe joint 18 is injection molded, the lower platen 2 is driven by an injection molding machine to move downward. The lower platen 2 drives components on the moving mold side such as the backing plate 5, the motor 6, the lower template 7, the middle template 9, the upper template 10, the driving shaft 11, the driving gear 12, the moving template 13, the moving die insert 14, the spiral core 15, the driven gear 16, the plastic pipe joint 18, the sealing ring 24, the upper gasket 25, the outer sleeve 26, the lower gasket 28, and the spring 32 to move downward together, while components on the fixed mold side such as the upper platen 1, the fixed template 3, the fixed die insert 4, and the fixed mold core 17 remain stationary, so that the mold gradually opens at the fixed template 3 and the moving template 13. At this time, the motor 6 (which can drive through components such as belts and belt pulleys) drives the driving shaft 11 and the driving gear 12 to rotate. The driving gear 12 drives the driven gear 16 and the spiral core 15 to rotate. The upper head of the spiral core 15 rotates out of the internal thread of the plastic pipe joint 18, and the lower head of the spiral core 15 drives the sealing ring 24 and the upper gasket 25 to rotate together, while the lower gasket 28 remains stationary with the water sealing groove 27 of the lower template 7. The lower end surface of the upper gasket 25 rotates and is in sealed contact with the upper end surface of the lower gasket 28 to achieve the water sealing effect. For an injection mold for a plastic pipe joint with a spiral core water sealing device in this solution, by arranging a sealing ring 24 made of rubber material and an upper gasket 25 made of graphite material on the outer wall of the lower head of the spiral core 15, and arranging a lower gasket 28 made of graphite material in the water sealing groove 27 of the lower template 7, and the upper gasket 25 and the lower gasket 28 rotate and are in sealed contact. Since the graphite material has good lubricity, a small friction coefficient, and good wear resistance, on the premise of ensuring the sealing performance between the spiral core 15 and the lower template 7, its service life is longer.

Claims

1. A plastic pipe joint injection mold with a spiral core water sealing device, comprising an upper composite plate (1) and a lower composite plate (2), a fixed mold plate (3) is arranged under the upper composite plate (1), a fixed mold insert (4) is arranged in the fixed mold plate (3), a fixed mold core (17) is arranged in the fixed mold insert (4), a backing plate (5) is arranged on the lower composite plate (2), a motor (6) and a lower mold plate (7) are arranged on the backing plate (5), a middle mold plate (9) is arranged on the lower mold plate (7), an upper mold plate (10) is arranged on the middle mold plate (9), a driving shaft (11) is arranged in the upper mold plate (10), the middle mold plate (9) and the lower mold plate (7), the driving shaft (11) is driven to rotate by the motor (6), and the driving shaft (11) A driving gear (12) is arranged in the middle mold plate (9) whose outer wall is located, a moving mold plate (13) is arranged on the upper mold plate (10), a moving mold insert (14) is arranged on the moving mold plate (13), a spiral core (15) is arranged in the moving mold insert (14), the moving mold plate (13), the upper mold plate (10), the middle mold plate (9) and the lower mold plate (7), the outer wall of the spiral core (15) is arranged in the middle mold plate (9), and a driven gear (16) is meshed with the driving gear (12), and an injection-molded plastic pipe joint (18) is arranged between the fixed mold insert (4), the fixed mold core (17), the moving mold insert (14) and the spiral core (15), characterized in that: The lower template (7) is provided with a water inlet hole (21) and a water outlet hole (22) for cooling water, and the spiral core (15) is provided with a cooling water path (23), the cooling water path (23) is communicated with the water inlet hole (21) and the water outlet hole (22), the lower outer wall of the spiral core (15) is provided with a sealing ring (24) made of a rubber material, the lower part of the sealing ring (24) is provided with an upper sealing gasket (25) made of a graphite material, and the outer part of the sealing ring (24) and the upper sealing gasket (25) is provided with a jacket (26), the lower template (7) is provided with a water sealing groove (27) located above the water inlet hole (21) and the water outlet hole (22), and a lower sealing gasket (28) made of a graphite material is provided in the water sealing groove (27), and the upper end of the lower sealing gasket (28) is in rotational contact with the lower end of the upper sealing gasket (25).

2. The plastic pipe joint injection mold with a spiral core water sealing device according to claim 1, characterized in that: A convex ring (29) is formed at the lower end of the upper sealing gasket (25), and the lower end of the convex ring (29) is in rotational contact with the upper end of the lower sealing gasket (28).

3. The plastic pipe joint injection mold with a spiral core water sealing device according to claim 1, characterized in that: The outer sleeve (26) is provided with an inner flange (30), and the sealing ring (24) is provided with an outer flange (31). A spring (32) is arranged in the outer sleeve (26), and the upper end of the spring (32) contacts the inner flange (30) of the outer sleeve (26), and the lower end of the spring (32) contacts the outer flange (31) of the sealing ring (24).

4. The plastic pipe joint injection mold with a spiral core water sealing device according to claim 1, characterized in that: An O-ring (33) is provided between the lower sealing gasket (28) and the inner wall of the water sealing groove (27).

Images