Bell and spigot joint injection mold of psp pipeline

Abstract

The utility model discloses a bell and spigot joint injection mold of a psp pipeline, and belongs to the technical field of injection molds. The mold comprises a mold core, an outer mold and a plugging assembly. The mold core is sleeved with the outer mold, and an injection molding cavity used for forming a birdmouth connector is formed between the mold core and the outer mold; the plugging assembly comprises an abutting ring, an annular sliding groove and an abutting piece, the abutting ring is arranged on the mold core in a sleeving mode and integrally connected with the mold core, the annular sliding groove is formed in the outer mold, the abutting ring is slidably clamped in the annular sliding groove, and the abutting piece abuts against the abutting ring through the outer mold. And a gap between the mold core and the outer mold is sealed. According to the injection mold, the sealing performance between the mold core and the outer mold can be improved, and injection molding materials are prevented from overflowing.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molds, in particular to an injection mold for socket joints of PSP pipes. Background Art

[0002] The PSP pipe (steel-plastic composite pressure pipe) has a welded steel pipe as the middle layer, and polyethylene plastics as the inner and outer layers. It is compounded into an integral pipe by using a special hot melt adhesive through an extrusion molding method.

[0003] The PSP pipe is mainly applied in the fields of municipal water supply and secondary water supply, petrochemical industry, protective casing, etc. Especially in the construction of drainage pipe systems, the PSP pipe is widely used. However, in the prior art, due to injection molding defects, the socket joints of PSP pipes are prone to problems such as insecure sealing between PSP pipes and easy breakage. Summary of the Utility Model

[0004] In view of this, it is necessary to provide an injection mold for socket joints of PSP pipes to solve the problem of low injection molding quality of the existing socket joints of PSP pipes.

[0005] The utility model provides an injection mold for socket joints of PSP pipes, including:

[0006] A core;

[0007] An outer mold, the outer mold is sleeved on the core, and an injection cavity for forming a socket joint is formed between the core and the outer mold;

[0008] A plugging component, the plugging component includes a butt joint ring, an annular chute and a pressing member. The butt joint ring is sleeved on the core and integrally connected with the core. The annular chute is opened inside the outer mold. The butt joint ring is slidably clamped in the annular chute. The pressing member abuts against the butt joint ring through the outer mold to seal the gap between the core and the outer mold.

[0009] Further, one end of the butt joint ring opposite to the injection cavity is provided with a butt joint surface adapted to the annular chute, and the butt joint surface is inclined from the middle to the periphery.

[0010] Further, the width of the butt joint ring along the core is smaller than the width of the annular chute along the core.

[0011] Further, it further includes a circulating cooling system, and the circulating cooling system includes a first cooling unit and a second cooling unit. The first cooling unit is disposed inside the mold core for cooling the inner wall of the socket interface. The second cooling unit is disposed inside the outer mold for cooling the outer wall of the socket joint. The cooling efficiency of the first cooling unit is lower than that of the second cooling unit.

[0012] Further, the cooling medium outlet of the first cooling unit is communicated with the cooling medium inlet of the second cooling unit through a pipeline.

[0013] Further, the first cooling unit includes an annular cavity, a first liquid inlet, and a first liquid outlet. The annular cavity is opened inside the mold core and is coaxially arranged with the mold core. The first liquid inlet and the first liquid outlet are respectively communicated with the annular cavity to drive the coolant in the annular cavity to circulate.

[0014] Further, the second cooling unit includes a plurality of groups of arc-shaped pipelines arranged in parallel, a second liquid inlet, and a second liquid outlet. The arc-shaped pipelines are opened in the outer mold, and the arc-shaped pipelines are arranged along the circumferential direction of the outer mold. The second liquid inlet and the second liquid outlet are respectively communicated with both ends of the arc-shaped pipelines.

[0015] Further, the plurality of second liquid inlets are communicated with the first liquid outlet through a pipeline, and the second liquid outlet and the first liquid inlet are communicated with a mold temperature controller through a pipeline.

[0016] Further, the outer mold includes two splicable half molds, and a space for installing the mold core is formed between the two half molds.

[0017] Further, the half mold is provided with an abutting portion for radially abutting against the mold core from the mold core.

[0018] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0019] For an injection mold for a socket joint of a PSP pipe of the present utility model, a sealing component is arranged between the mold core and the outer mold. The sealing component includes an abutting ring, an annular sliding groove, and a pressing member. The abutting ring is sleeved on the mold core and is integrally connected with the mold core, and the abutting ring can be stably connected with the mold core. The annular sliding groove is opened inside the outer mold, and the abutting ring is slidably clamped in the annular sliding groove. The cooperation between the mold core and the outer mold is more precise, which helps to maintain the shape stability of the injection cavity and ensure that the formed socket joint has high precision and consistency. The pressing member abuts against the abutting ring through the outer mold, which can effectively seal the gap between the mold core and the outer mold, prevent the leakage of the plastic melt, ensure the sealing performance of the finished product, thereby reducing the problems of overflow or shortage of materials during the injection process, and thus reducing the incidence of injection defects. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings described herein are provided to further understand the present utility model and form a part of this application. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation to the present utility model. In the drawings:

[0021] Figure 1 is the structural schematic diagram of the whole of the present utility model Figure 1 ;

[0022] Figure 2 is the structural schematic diagram of the whole of the present utility model Figure 1 ;

[0023] Figure 3 is the structural schematic diagram of the whole of the present utility model Figure 1 ;

[0024] Figure 4 is the structural schematic diagram of the plugging component in the present utility model;

[0025] Figure 5 is the structural schematic diagram of the half mold in the present utility model.

[0026] In the figure, 100, the mold core;

[0027] 200, the outer mold; 210, the half mold;

[0028] 300, the plugging component; 310, the abutting ring; 311, the abutting surface; 320, the annular sliding groove; 330, the pressing member;

[0029] 400, the circulating cooling system; 410, the first cooling unit; 411, the annular cavity; 412, the first liquid inlet; 413, the first liquid outlet; 420, the second cooling unit; 421, the arc-shaped pipeline; 422, the second liquid inlet; 423, the second liquid outlet. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] The following will specifically describe the preferred embodiments of the present utility model in conjunction with the drawings, wherein the drawings form a part of this application and are used together with the embodiments of the present utility model to explain the principle of the present utility model, and are not used to limit the scope of the present utility model.

[0031] An injection mold for the socket joint of a psp pipe in this embodiment relates to the technical field of injection molds. With the aid of the plugging component 300, it can axially tighten against the mold core 100 to reinforce the mold core 100 and prevent the mold core 100 from rotating relative to the outer mold 200. The sealing performance between the mold core 100 and the outer mold 200 is better, which can prevent the injection material from overflowing.

[0032] Please refer toFigures 1 to 5 , a socket joint injection mold for a psp pipe in this embodiment, includes a mold core 100, an outer mold 200 and a plugging component 300. The outer mold 200 is sleeved on the mold core 100, and an injection cavity for forming a socket joint is formed between the mold core 100 and the outer mold 200, and injection can be carried out into the injection cavity to complete the forming of the socket joint of the psp pipe.

[0033] The plugging component 300 includes a contact ring 310, an annular chute 320 and a pressing member 330. The contact ring 310 is sleeved on the mold core 100 and integrally connected to the mold core 100, and the contact ring 310 can maintain a stable connection with the mold core 100. The annular chute 320 is opened inside the outer mold 200, and the contact ring 310 is slidably clamped in the annular chute 320, so that the cooperation between the mold core 100 and the outer mold 200 is more precise, which helps to maintain the shape stability of the injection cavity and ensure that the formed socket joint has high precision and consistency. The pressing member 330 abuts against the contact ring 310 through the outer mold 200, which can effectively seal the gap between the mold core 100 and the outer mold 200, prevent the leakage of the plastic melt, ensure the sealing performance of the finished product, thereby reducing the problems of overflow or lack of material during the injection process, and thus reducing the incidence of injection defects.

[0034] In some embodiments, please refer to Figure 3 and Figure 4 , one end of the contact ring 310 relative to the injection cavity is provided with a contact surface 311 adapted to the annular chute 320. The contact surface 311 of the contact ring 310 can abut against the inner wall of the annular chute 320 to fix the position of the contact ring 310, thereby realizing the fixation of the mold core 100. The contact surface 311 is inclined from the middle to the periphery, so that the contact surface 311 becomes a conical surface. The conical surface forms a better fitting effect in the chute, increasing the tightness of the seal. The conical surface can also reduce the gap between the mold core 100 and the outer mold 200, prevent the overflow of the molten material during the injection process, and thus improve the sealing effect during the forming process.

[0035] In some aspects, the conical surface also helps to evenly distribute the acting force to the entire contact ring 310. When pressure is applied, the conical surface causes the force to gradually transmit along the inclined surface, avoiding the concentration of force at a certain point, thereby reducing local stress concentration.

[0036] In some embodiments, please refer to Figure 4 , the width of the contact ring 310 along the mold core 100 is smaller than the width of the annular chute 320 along the mold core 100. The contact ring 310 has a certain movement space in the chute, allowing the contact ring 310 to finely adjust its position during the mold assembly and injection process, and can adapt to the slight alignment error between the mold core 100 and the outer mold 200, thereby ensuring a better sealing effect during the injection process.

[0037] Since the abutting ring 310 can slide within the annular sliding groove 320, the precision requirements for mold assembly are reduced. Even if there are certain tolerances or alignment errors between the mold core 100 and the outer mold 200 in the width direction, the abutting ring 310 can still achieve good fitting and sealing through fine adjustment within the sliding groove, improving the fault tolerance of mold assembly and making the production process more flexible.

[0038] In some embodiments, an injection mold for the socket joint of a psp pipe further includes a circulating cooling system 400. The circulating cooling system 400 includes a first cooling unit 410 and a second cooling unit 420. The first cooling unit 410 is disposed inside the mold core 100. The first cooling unit 410 can cool the inner wall of the socket joint to promote the rapid curing of the socket joint. The second cooling unit 420 is disposed inside the outer mold 200. The second cooling unit 420 can cool the outer wall of the socket joint to promote the rapid curing of the socket joint. The cooling efficiency of the first cooling unit 410 is lower than that of the second cooling unit 420.

[0039] The inner wall of the socket joint cools faster than the outer wall. Due to the faster curing speed, the molecular structure of the rapidly cooled inner wall will be more compact, thereby enhancing its strength and durability. The slowly cooled outer wall can reduce the internal stress generated during the cooling process, thereby maintaining the toughness of the outer wall. Through this combined cooling, the overall mechanical properties of the finished product are enhanced, especially the resistance to high pressure and impact is stronger.

[0040] The slower cooling speed of the outer wall can avoid defects such as depressions and cracks on the surface due to excessive cooling, making the outer wall surface smoother and more uniform. When the socket joint is connected to the pipe, the socket joint with high surface quality is inserted into the pipe, and the sealing effect between the outer wall of the socket joint and the inner wall of the pipe is better, preventing leakage between the pipes.

[0041] In some embodiments, please refer to Figure 3 , the cooling medium outlet of the first cooling unit 410 is connected to the cooling medium inlet of the second cooling unit 420 through a pipe. After the cooling medium passing through the first cooling unit 410 absorbs the heat from the mold core 100, it moves to the second cooling unit 420. The cooling medium absorbs the heat of the outer mold 200 at the second cooling unit 420. The temperature of the cooling medium in the second cooling unit 420 is higher than that in the first cooling unit 410. The cooling efficiency of the first cooling unit 410 is lower than that of the second cooling unit 420, and the inner wall of the socket joint cools faster than the outer wall.

[0042] In some embodiments, please continue to refer to Figure 3The first cooling unit 410 includes an annular cavity 411, a first liquid inlet 412 and a first liquid outlet 413. The annular cavity 411 is opened inside the mold core 100 and is coaxially arranged with the mold core 100. The coolant can be evenly distributed and circulated in the entire annular cavity 411, thereby ensuring that the inner wall of the receiving interface inside the mold core 100 is evenly cooled. The annular cavity 411 can prevent stress concentration and deformation caused by local overcooling or overheating, and maintain the structural stability and dimensional accuracy of the finished product.

[0043] The first liquid inlet 412 and the first liquid outlet 413 are respectively connected to the annular cavity 411, and the coolant can circulate continuously, thereby maintaining a constant coolant temperature in the annular cavity 411. With the help of the first liquid inlet 412 and the first liquid outlet 413, the coolant can quickly take away the heat in the mold core 100, shorten the cooling time of the inner wall of the receiving interface, improve the cooling efficiency, and thus speed up the overall production speed of injection molding.

[0044] Since the coolant circulates continuously in the annular cavity 411, heat will not accumulate inside the core 100, which can reduce the thermal stress and internal stress caused by uneven cooling, thereby reducing the risk of defects such as cracking and deformation in the finished product and improving the durability and service life of the product.

[0045] It should be particularly noted that: the first liquid inlet 412 is set at the lowest position of the annular cavity 411, and the first liquid outlet 413 is set at the highest position of the annular cavity 411. The coolant in the annular cavity 411 can be output from the first liquid outlet 413 only after filling the entire annular cavity 411, which can avoid uneven heat dissipation caused by uneven distribution of the coolant in the annular cavity 411, affecting the forming of the socket joint.

[0046] In some embodiments, see Figure 5 The second cooling unit 420 includes a plurality of sets of arc-shaped pipelines 421 arranged in parallel, a second liquid inlet 422 and a second liquid outlet 423. The arc-shaped pipelines 421 are opened in the outer mold 200. The arc-shaped pipelines 421 are arranged along the circumference of the outer mold 200. The coolant can be evenly distributed around the entire outer mold 200 through the plurality of sets of arc-shaped pipelines 421 arranged in parallel, so that the outer wall of the receiving interface joint is evenly heated during the cooling process, thereby avoiding local deformation, stress concentration or surface defects caused by uneven cooling.

[0047] As a further embodiment, multiple groups of arc-shaped pipelines 421 are arranged in parallel to make the cooling system more flexible. By adjusting the flow rate or temperature of each group of arc-shaped pipelines 421, accurate cooling control of different areas can be achieved to adapt to different production requirements or product designs.

[0048] The second liquid inlet 422 and the second liquid outlet 423 are respectively communicated with both ends of the arc-shaped pipeline 421, which can drive the coolant in the arc-shaped pipeline 421 to circulate, promote the heat exchange between the outer mold 200 and the socket joint, and accelerate the cooling of the socket joint.

[0049] In some embodiments, a plurality of second liquid inlets 422 are communicated with the first liquid outlet 413 through pipelines, and the second liquid outlet 423 and the first liquid inlet 412 are communicated with the mold temperature controller through pipelines. Connecting the first liquid outlet 413 with a plurality of second liquid inlets 422 enables the coolant flowing out of the first cooling unit 410 to directly enter the second cooling unit 420. By recycling the same coolant, the waste of coolant is effectively reduced, the production cost is lowered, and at the same time, the dependence of the cooling system on external resources is reduced, and the energy utilization efficiency of the overall system is improved.

[0050] Since the cooling temperature of the first cooling unit 410 is lower than that of the second cooling unit 420, the temperature of the coolant will increase after passing through the first cooling unit 410. When the coolant enters the second cooling unit 420, it has reached the temperature suitable for cooling the outer wall of the socket. This temperature gradient control ensures that the cooling processes of the inner and outer walls are carried out at the optimal temperatures respectively, thereby avoiding stress or deformation problems caused by too large a difference in the cooling rates of the inner and outer walls.

[0051] In some embodiments, please refer to Figure 3 , the outer mold 200 includes two splittable half molds 210, and a space for installing the mold core 100 is formed between the two half molds 210. The two splittable half molds 210 make the disassembly and assembly of the mold simpler and more convenient. When maintenance, cleaning of the mold or replacement of the mold core 100 is required, only by separating the half molds 210 can the mold core 100 be easily taken out or adjusted, reducing the difficulty and time cost of maintenance work and improving the operation efficiency of the production line.

[0052] In some embodiments, the half mold 210 is provided with an abutting portion for radially abutting against the mold core 100 from the mold core 100. The abutting portion abuts against and supports the mold core 100 from the radial direction of the mold core 100, so that the mold core 100 can be accurately fixed at a predetermined position of the half mold 210 during installation. Precise positioning effectively prevents the mold core 100 from shifting or deviating during the injection molding process, ensuring the dimensional accuracy and consistency of the injection molded product.

[0053] The abutting portion provides an additional supporting force, making the mold core 100 more stable during the injection molding process, resisting the possible movement and vibration of the mold core 100, and ensuring the stability of the mold under high pressure conditions.

[0054] Workflow: First, accurately install the mold core 100 in the space formed by the half mold 210, ensuring that the mold core 100 is in close contact with the abutting part to avoid loosening or deviation. Next, close the two spliceable half molds 210 and ensure that the mating surfaces between them are closely fitted, so that the mold core 100 is firmly fixed in the mold. Then, connect the first liquid inlet 412 and the first liquid outlet 413 to the pipes of the mold temperature controller respectively, and at the same time ensure that the second liquid inlet 422 is connected to the first liquid outlet 413, and the second liquid outlet 423 is connected to the mold temperature controller. Finally, use an injection molding machine to inject molten plastic into the mold.

[0055] As mentioned above, it is only the preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed by the present invention should be covered by the present invention.

Claims

1. A socket joint injection mold for a PSP pipe, characterized in that: include: Mold core; An outer mold, the outer mold is sleeved on the mold core, and an injection cavity for molding a receiving interface is formed between the mold core and the outer mold; A sealing component, the sealing component includes an abutment ring, an annular groove and a pressure piece, the abutment ring is sleeved on the mold core and is integrally connected to the mold core, the annular groove is opened inside the outer mold, the abutment ring is slidably engaged in the annular groove, and the pressure piece abuts against the abutment ring through the outer mold to seal the gap between the mold core and the outer mold.

2. A socket joint injection mold for a PSP pipe according to claim 1, characterized in that: An end of the abutment ring opposite to the injection cavity is provided with an abutment surface matched with the annular slide groove, and the abutment surface is inclined from the middle to the surrounding areas.

3. A socket joint injection mold for a PSP pipe according to claim 2, characterized in that: The width of the abutment ring along the mold core is smaller than the width of the annular slide groove along the mold core.

4. The socket joint injection mold for a PSP pipe according to claim 1, characterized in that: It also includes a circulating cooling system, which includes a first cooling unit and a second cooling unit. The first cooling unit is arranged inside the mold core to cool the inner wall of the receiving interface; the second cooling unit is arranged inside the outer mold to cool the outer wall of the receiving interface. The cooling efficiency of the first cooling unit is lower than that of the second cooling unit.

5. A socket joint injection mold for a PSP pipe according to claim 4, characterized in that: The cooling medium outlet of the first cooling unit is communicated with the cooling medium inlet of the second cooling unit through a pipeline.

6. A socket joint injection mold for a PSP pipe according to claim 5, characterized in that: The first cooling unit includes an annular cavity, a first liquid inlet and a first liquid outlet. The annular cavity is opened inside the mold core and is coaxially arranged with the mold core. The first liquid inlet and the first liquid outlet are respectively connected to the annular cavity to drive the circulation of the cooling liquid in the annular cavity.

7. A socket joint injection mold for a PSP pipe according to claim 6, characterized in that: The second cooling unit includes a plurality of groups of arc-shaped pipelines arranged in parallel, a second liquid inlet and a second liquid outlet. The arc-shaped pipeline is opened in the outer mold, and the arc-shaped pipeline is arranged along the circumference of the outer mold. The second liquid inlet and the second liquid outlet are respectively connected to the two ends of the arc-shaped pipeline.

8. The socket joint injection mold for a PSP pipe according to claim 7, characterized in that: The plurality of second liquid inlets are connected to the first liquid outlet via a pipeline, and the second liquid outlet and the first liquid inlet are connected to a mold temperature controller via a pipeline.

9. The socket joint injection mold for a PSP pipe according to claim 1, characterized in that: The outer mold comprises two connectable half molds, and a space for installing the mold core is formed between the two half molds.

10. The socket joint injection mold for a PSP pipe according to claim 9, characterized in that: The half mold is provided with an abutting portion for abutting against the mold core in a radial direction of the mold core.

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