CN111619088A - Mold assembly for plastic pipeline molding - Google Patents

Abstract

The invention provides a mold assembly for plastic pipeline molding, which comprises a molding pipe head (100) and an outer mold mechanism (300), wherein the feeding end of the molding pipe head (100) is coaxially and fixedly connected and communicated with the discharging end of plastic melting equipment, the outer mold mechanism (300) is installed on the molding pipe head (100), the outer mold mechanism (300) comprises a thickness adjusting component (310) and an outer mold component (320), the outer mold component (320) is used for providing an outer mold for the molding process of a square plastic pipeline, the area of an outer mold area provided by the outer mold component (320) can be changed, and the thickness adjusting component (310) is used for providing power for the process of adjusting the area of the outer mold component (320); the plastic pipe mould can receive molten plastic and form the molten plastic into a square plastic pipe structure, and can adjust the distance between the outer mould area and the inner mould body according to the actual wall thickness of the square plastic pipe to be produced so as to meet the requirement, so that the plastic pipe mould has wider applicability.

Description

Mold assembly for plastic pipeline molding

Technical Field

The invention relates to the field of plastic products, in particular to a mold assembly for plastic pipeline molding.

Background

Plastic pipes are more and more commonly applied in the aspects of self-cleaning pipelines, water supply pipes, water discharge pipes, gas pipes and the like, plastic pipes are generally formed by taking plastic resin as a raw material and adding a stabilizer, a lubricant and the like and extruding and processing the plastic resin in a pipe making machine by an injection molding method, and the plastic pipes are more and more widely applied in building engineering due to the characteristics of light weight, corrosion resistance, attractive appearance, no bad smell, easiness in processing, convenience in construction and the like, are mainly used as running water supply system pipes, drainage, exhaust and pollution discharge sanitary pipes, underground drainage pipe systems, rainwater pipes, threading pipes for electric wire installation and assembly and the like of house buildings, and the existing plastic pipe manufacturing equipment has some defects, such as blockage caused by semi-solidification of molten plastic in the melting process of plastic raw materials, and different molds used by plastic pipes with different specifications are different, the invention provides a square plastic pipe fitting forming machine head, which can receive molten plastic and form the molten plastic into a square plastic pipe structure, can adjust the distance between an outer mould area and an inner mould according to the actual wall thickness of a square plastic pipe to be produced, can adjust the distance between the outer mould area and the inner mould to meet the wall thickness requirement of the square plastic pipe to be produced actually, has wider applicability, is fully automatic in the distance adjusting process between the outer mould area and the inner mould, can be realized by a worker only by starting and closing a driving motor according to the actual condition, and is simple, rapid and easy to operate in the whole adjusting process.

Disclosure of Invention

In order to solve the defects of the prior art, the invention aims to provide a mold assembly for plastic pipeline molding, which can receive molten plastic and mold the molten plastic into a square plastic pipeline structure, can adjust the distance between an outer mold area and an inner mold body according to the actual wall thickness of a square plastic pipeline to be produced, can adjust the distance between the outer mold area and the inner mold body and make the distance meet the wall thickness requirement of the square plastic pipeline to be produced actually, has wider applicability, is fully automatic in the distance adjusting process between the outer mold area and the inner mold body, can be operated by a worker only by starting and closing a driving motor according to the actual conditions, and is simple, rapid and easy to operate in the whole adjusting process.

In order to achieve the technical purpose, the technical scheme adopted by the invention is as follows.

The mold assembly for plastic pipeline molding comprises a molding pipe head (100) and an outer mold mechanism (300), wherein the feeding end of the molding pipe head (100) is coaxially and fixedly connected and communicated with the discharging end of plastic melting equipment, the outer mold mechanism (300) is installed on the molding pipe head (100), and the outer mold mechanism (300) is used for providing an outer mold for the square plastic pipeline molding process;

the outer die mechanism (300) comprises a thickness adjusting member (310) and an outer die member (320), wherein the outer die member (320) is used for providing an outer die for the square plastic pipeline forming process, the area of an outer die area provided by the outer die member (320) can be changed, and the thickness adjusting member (310) is used for providing power for the process that the outer die member (320) adjusts the area of the outer die area.

The technical scheme is further improved and optimized.

The forming pipe head (100) comprises a fixed shell (101), a feeding joint (102), a first fixed disc (103), a second fixed disc (105) and a forming pipeline (104), wherein the feeding joint (102) is of a circular pipeline structure with openings at two ends, a fixed step coaxially extends towards the direction far away from the axial lead of the feeding joint (102) from one opening end of the feeding joint, a fixed end cover is coaxially and fixedly arranged at the other opening end of the feeding joint (102), and the fixed step of the feeding joint (102) is coaxially and fixedly connected with the discharge end of plastic melting equipment through a fastening bolt;

the fixed disc I (103) is of a circular ring-shaped plate structure, the fixed disc I (103) is coaxially and fixedly connected with the end face, deviating from the feeding joint (102), of the fixed end cover, the forming pipeline (104) is of a pipeline structure with openings at two ends, the forming pipeline (104) is coaxially and fixedly connected with the end face, deviating from the feeding joint (102), of the fixed disc I (103), the fixed disc II (105) is of a circular ring-shaped plate structure, and the fixed disc II (105) is coaxially and fixedly connected with the end face, deviating from the feeding joint (102), of the forming pipeline (104);

the fixed shell (101) is of a circular shell structure with an opening at one end and a closed end, the fixed shell (101) is coaxially and fixedly sleeved on the outer circular surfaces of the first fixed disk (103) and the second fixed disk (105), and the closed end of the fixed shell (101) is coaxially provided with a discharging joint communicated with the cavity of the forming pipeline (104).

The technical scheme is further improved and optimized.

Outer mould component (320) including mould board (321), drive assembly, mould board (321) are the major surface and are on a parallel with shaping pipeline (104) axial rectangular plate structure, mould board (321) set up in shaping pipeline (104) and contact between the terminal surface that the one end of mould board (321) deviates from feed connector (102) and fixed end cover, contact between the inner chamber end of the other end and fixed shell (101), mould board (321) are provided with four groups and four groups mould board (321) constitute outer mould district jointly, outer mould district is square structure.

The technical scheme is further improved and optimized.

The driving assembly comprises a screw rod (322) and a guide rod (323), the extension directions of the screw rod (322) and the guide rod (323) are both vertical to the axial direction of the forming pipeline (104), one end of the screw rod (322)/the guide rod (323) is fixedly connected with the die plate (321), the other end of the screw rod (322)/the guide rod (323) penetrates through the side wall of the forming pipeline (104) and is positioned in the area between the outer circular surface of the forming pipeline (104) and the cavity wall of the inner cavity of the fixed shell (101), and the screw rod (322)/the guide rod (323) can displace along the extension direction of the screw rod (;

the driving assemblies are correspondingly provided with four groups, and when the four groups of driving assemblies synchronously displace along the extending direction of the driving assemblies, the area of an outer die area formed by the four groups of die plates (321) can be changed, and the outer die area is always in a square structure.

The technical scheme is further improved and optimized.

The thickness adjusting component (310) comprises a driving motor (311), a first power transmission component (312) and a second power transmission component (313), wherein the first power transmission component (312) is used for receiving the power of the driving motor (311) and transmitting the power to the second power transmission component (313), and the second power transmission component (313) is used for receiving the power given by the second power transmission component (313) and driving the four groups of driving components to synchronously displace along the extending direction of the second power transmission component (313).

The technical scheme is further improved and optimized.

The driving motor (311) is fixedly arranged on the outer circular surface of the fixed shell (101), the power output end of the driving motor (311) penetrates through the side wall of the fixed shell (101) and is positioned in the area between the cavity wall of the inner cavity of the fixed shell (101) and the outer circular surface of the forming pipeline (104), and the axial direction of the output shaft of the driving motor (311) is consistent with the diameter direction of the fixed shell (101) at the fixed point.

The technical scheme is further improved and optimized.

The first power transmission assembly (312) is arranged in an area between the inner cavity wall of the fixed shell (101) and the outer circular surface of the forming pipeline (104), the first power transmission assembly (312) comprises a first transmission shaft (3121), a first power transmission member (3122) and a second power transmission member, the axial direction of the first transmission shaft (3121) is parallel to the axial direction of the forming pipeline (104), one end of the first transmission shaft (3121) is movably connected with the first fixed disk (103), the other end of the first transmission shaft is movably connected with the second fixed disk (105), and the first transmission shaft (3121) can rotate around the axial direction of the first transmission shaft (3121);

the first power transmission piece (3122) is arranged in the power output end of the driving motor (311) and the first transmission shaft (3121), the first power transmission piece (3122) is used for power connection transmission between the driving motor (311) and the first transmission shaft (3121), and the first power transmission piece (3122) is a bevel gear power transmission structure;

the power transmission member I (3122) comprises a driving straight gear (3123) and a driven outer gear ring (3124), the driving straight gear (3123) is coaxially and fixedly mounted at the outer part of the transmission shaft I (3121), the driven outer gear ring (3124) is coaxially mounted at the outer part of the forming pipeline (104) through a bearing, and the driving straight gear (3123) and the driven outer gear ring (3124) are mutually meshed.

The technical scheme is further improved and optimized.

The second power transmission assembly (313) is arranged in an area between the cavity wall of the inner cavity of the fixed shell (101) and the outer circular surface of the forming pipeline (104), the second power transmission assembly (313) comprises a mounting support (3131), a second transmission shaft (3132) and a third transmission shaft (3133), the mounting support (3131) is fixedly arranged on the outer circular surface of the forming pipeline (104), the axial direction of the second transmission shaft (3132) is parallel to the axial direction of the forming pipeline (104), the second transmission shaft (3132) is movably arranged on the mounting support (3131) and can rotate around the axial direction of the second transmission shaft, a receiving straight gear (3133) is further coaxially and fixedly arranged on the second transmission shaft (3132), and the receiving straight gear (3133) is meshed with the driven outer gear ring (3124);

the axial direction of the third transmission shaft (3134) is parallel to the diameter direction of the straight line intersection point of the forming pipeline (104) and the third transmission shaft (3134), and the third transmission shaft (3134) is movably arranged on the mounting support (3131) and can rotate around the self axial direction;

a power transmission piece III (3135) is arranged between the second transmission shaft II (3132) and the third transmission shaft III (3134), power connection and transmission are carried out between the second transmission shaft II and the third transmission shaft III (3135) through the power transmission piece III (3135), and the power transmission piece III (3135) is a bevel gear power transmission structure;

a power transmission part IV (3136) is arranged between the transmission shaft III (3134) and the screw rod (322) of the driving assembly, the power transmission part IV (3136) comprises an input straight gear and an output straight gear, the input straight gear is coaxially and fixedly arranged outside the transmission shaft III (3134), the output straight gear is coaxially sleeved outside the screw rod (322) in a threaded mounting mode and is also movably connected with the mounting bracket (3131), the output straight gear rotates around the self axial direction and can pull the screw rod (322) to displace along the self axial direction, and the output straight gear is meshed with the input straight gear;

four groups of power transmission assemblies (313) are correspondingly arranged.

Compared with the prior art, the invention has the advantages that the plastic pipe structure can receive molten plastic and form the molten plastic into a square plastic pipe structure, and the distance between the outer die area and the inner die body can be adjusted according to the actual wall thickness of the square plastic pipe to be produced, so that the distance between the outer die area and the inner die body can be adjusted and the distance meets the wall thickness requirement of the square plastic pipe to be produced actually, the applicability is wider, the distance adjusting process between the outer die area and the inner die body is fully automatic, a worker only needs to start and close the driving motor according to the actual situation, and the whole adjusting process is simple, rapid and easy to operate; in addition, the supporting block arranged in the inner die body has a supporting function on the inner die body, and when cooling water flows into the cooling section of the inner die body, the supporting block can distribute flowing water between the supporting block and the inner die body, so that the cooling effect is better; in addition, the arrangement of the vacuum pipeline in the cooling assembly enables the flowing water cooling system to only provide a cooling effect on the molten plastic in the forming pipeline, and does not influence the molten plastic in the pipe cavity of the feeding joint, namely, does not influence the flow of the molten plastic to the area between the outer mold area and the inner mold body.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention.

Fig. 2 is a schematic view of the overall structure of the present invention.

Fig. 3 is a schematic view of the internal structure of the present invention.

FIG. 4 is a schematic view of the structure of the forming tube head, the inner mold body and the cooling assembly of the present invention.

FIG. 5 is a schematic cross-sectional view of a formed tube head, inner mold body, and cooling assembly of the present invention.

Fig. 6 is a schematic structural view of the inner mold body and the feed joint of the present invention.

Fig. 7 is a schematic structural view of the outer mold mechanism of the present invention.

Fig. 8 is a schematic structural view of the outer mold mechanism of the present invention.

Fig. 9 is a schematic structural view of the outer mold mechanism of the present invention.

Fig. 10 is a schematic structural view of an outer mold member of the present invention.

Fig. 11 is a schematic structural view of a thickness adjustment member according to the present invention.

Fig. 12 is a schematic structural diagram of a first driving motor and a first power transmission assembly of the invention.

Fig. 13 is a schematic structural diagram of a second power transmission assembly of the present invention.

Detailed Description

The following description of the embodiments of the present invention will be made with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.

Square plastic pipeline forming head with adjustable thickness, it includes forming tube head 100, interior mould body 200, outer mould mechanism 300, cooling module 400, coaxial fixed connection switch-on between the feed end of forming tube head 100 and the discharge end of plastics melting equipment, interior mould body 200/outer mould mechanism 300/cooling module 400 all install on forming tube head 100, interior mould body 200 and outer mould mechanism 300 cooperation are used for providing the mould for the shaping of square plastic pipeline, cooling module 400 is used for providing the cooling water that flows for square plastic pipeline shaping in-process.

The forming tube head 100 comprises a fixed shell 101, a feeding connector 102, a first fixed disc 103, a second fixed disc 105 and a forming pipeline 104, wherein the feeding connector 102 is of a circular pipeline structure with openings at two ends, one opening end of the feeding connector 102 is coaxially extended to a direction far away from the axis of the feeding connector 102 and is provided with a fixed step, the other opening end of the feeding connector is coaxially and fixedly provided with a fixed end cover, and the fixed step of the feeding connector 102 is coaxially and fixedly connected with the discharge end of the plastic melting equipment through a fastening bolt.

Fixed disk 103 be the annular plate body structure to fixed disk 103 and fixed end cover deviate from coaxial fixed connection between the terminal surface of feed connector 102, shaping pipeline 104 be both ends open-ended pipeline structure, and coaxial fixed connection between the terminal surface that feed connector 102 deviates from shaping pipeline 104 and fixed disk 103, two 105 of fixed disk be the annular plate body structure, and fixed disk 105 and shaping pipeline 104 deviate from coaxial fixed connection between the terminal surface of feed connector 102.

The fixed shell 101 is a circular shell structure with an opening at one end and a closed end, the fixed shell 101 is coaxially and fixedly sleeved on the outer circular surfaces of the first fixed disk 103 and the second fixed disk 105, and the closed end of the fixed shell 101 is coaxially provided with a discharging joint communicated with the cavity of the forming pipeline 104.

The inner die body 200 be both ends open-ended rectangle pipeline structure, the one end of the inner die body 200 is for intaking one side that the end lies in fixed shell 101 blind end and deviates from feeding joint 102, the other end of the inner die body 200 is that link and this end pass in proper order and set up in the ejection of compact joint of fixed shell 101 blind end, fixed shell 101 inner chamber back and set up coaxial fixed connection between the fixed end cover of feeding joint 102 tip, still coaxial seting up the connecting hole that runs through its axial thickness on the fixed end cover, the connecting hole is used for the intercommunication each other between the inner die body 200 and the feeding joint 102.

The side surface of the inner die body 200 is provided with a feeding hole 201 penetrating through the thickness of the inner die body, the feeding hole 201 is used for communicating the inner cavity of the inner die body 200 and the cavity of the forming pipeline 104, the feeding hole 201 is close to the connecting end of the inner die body 200, and preferably, four groups of side surfaces of the inner die body 200 are provided with the feeding holes 201.

The inner die body 200 is further internally provided with a baffle plate, the baffle plate is positioned on one side of the feeding hole 201 departing from the feeding joint 102 and is also close to the feeding joint 102, and the baffle plate is used for dividing the inner cavity of the inner die body 200 into two sections which are respectively a cooling section between the baffle plate and the water inlet end of the inner die body 200 and a feeding section between the baffle plate and the connecting end of the inner die body 200.

The cooling assembly 400 comprises a drainage pipeline 401 and a vacuum pipeline 402, the vacuum pipeline 402 is provided with two groups of vacuum pipelines I and II, the axial direction of the first vacuum pipeline is parallel to the end face of the opening end of the feeding joint 102, the first vacuum pipeline is fixedly arranged in the feeding joint 102, two pipe orifices of the first vacuum pipeline are fixed with the wall of the feeding joint 102, a suction hole communicated with one pipe orifice of the first vacuum pipeline is arranged on the outer circular surface of the feeding joint 102, a sealing end cover is arranged at the orifice of the suction hole in a matching way, an avoidance hole communicated with the other pipe orifice of the first vacuum pipeline is also arranged on the outer circular surface of the feeding joint 102, the second vacuum pipeline and the feeding joint 102 are coaxially arranged, one end of the second vacuum pipeline is fixedly connected with the baffle, the other end of the second vacuum pipeline is fixedly connected with the first vacuum pipeline, and the second vacuum pipeline is communicated with the first vacuum pipeline in a mutual connection mode.

One end of the drainage pipeline 401 is fixedly connected with the baffle, and the other end of the drainage pipeline 401 sequentially penetrates through the first vacuum pipeline, the second vacuum pipeline and the avoidance hole formed in the outer circular surface of the feeding joint 102 and then is located outside the forming pipe head 100.

And sealing gaskets are arranged among the drainage pipeline 401, the vacuum pipeline II and the avoidance holes arranged on the outer circular surface of the feeding joint 102, sealing gaskets are arranged among the vacuum pipeline II, the baffle and the drainage pipeline 401, and the interiors of the vacuum pipeline I and the vacuum pipeline II are vacuum structures.

The cooling water flows in from the water inlet end of the inner mold body 200 and is discharged after passing through the cooling section of the inner cavity of the inner mold body 200 and the water discharge pipeline 401, so that a flowing water cooling system is formed.

More specifically, a supporting block 202 in a rectangular strip structure is coaxially arranged in the cooling section of the inner cavity of the inner mold body 200, a connecting plate is arranged on the side surface of the supporting block 202, and the supporting block 202 is fixedly connected with the cooling section of the inner cavity of the inner mold body 200 through the connecting plate; the supporting block 202 is provided to support the inner mold body 200, and in addition, after the cooling water flows into the cooling section of the inner mold body 200, the flowing water is distributed between the supporting block 200 and the inner mold body 200 due to the existence of the supporting block 200, so that the cooling effect is better.

The outer mold mechanism 300 comprises a thickness adjusting member 310 and an outer mold member 320, wherein the outer mold member 320 is used for being matched with the inner mold body 200 and providing a mold for forming the square plastic pipe, the distance between the outer mold member 320 and the inner mold body 200 is adjustable, and the thickness adjusting member 310 is used for providing power for the process of adjusting the distance between the outer mold member 320 and the inner mold body 200.

The outer mold member 320 comprises mold plates 321 and a driving assembly, the mold plates 321 are rectangular plate structures with large faces parallel to the axial direction of the forming pipeline 104, the mold plates 321 are arranged in an area between the inner cavity wall of the forming pipeline 104 and the outer surface of the inner mold body 200, one ends of the mold plates 321 are in contact with the end faces of the fixed end covers, which are away from the feeding connectors 102, and the other ends of the mold plates are in contact with the cavity bottom of the inner cavity of the fixed shell 101, the mold plates 321 are provided with four groups of the mold plates 321, the four groups of the mold plates 321 jointly form an outer mold area, the outer mold area is of a square structure, and the central line of the outer mold area and the central.

The driving assembly comprises a screw rod 322 and a guide rod 323, the extending directions of the screw rod 322 and the guide rod 323 are both perpendicular to the axial direction of the forming pipe 104, one end of the screw rod 322/the guide rod 323 is fixedly connected with the die plate 321, the other end of the screw rod 322/the guide rod 323 penetrates through the side wall of the forming pipe 104 and is located in the area between the outer circular surface of the forming pipe 104 and the cavity wall of the inner cavity of the fixed shell 101, and the screw rod 322/the guide rod 323 can displace along the extending direction thereof.

The driving components are correspondingly provided with four groups, and when the four groups of driving components synchronously displace along the extending direction of the driving components, the area of an outer die area formed by the four groups of die plates 321 can be changed, and the outer die area always keeps a square structure which is concentric with the inner die body 200.

The thickness adjusting member 310 includes a driving motor 311, a first power transmission component 312, and a second power transmission component 313, wherein the first power transmission component 312 is used for receiving the power of the driving motor 311 and transmitting the power to the second power transmission component 313, and the second power transmission component 313 is used for receiving the power provided by the second power transmission component 313 and driving the four sets of driving components to synchronously displace along the extending direction thereof by using the power.

The driving motor 311 is fixedly installed on the outer circular surface of the fixed housing 101, the power output end of the driving motor 311 passes through the side wall of the fixed housing 101 and is located in the area between the cavity wall of the inner cavity of the fixed housing 101 and the outer circular surface of the forming pipeline 104, and the axial direction of the output shaft of the driving motor 311 is consistent with the diameter direction of the fixed housing 101 at the fixed point.

The first power transmission assembly 312 is arranged in an area between the cavity wall of the inner cavity of the fixed shell 101 and the outer circular surface of the forming pipeline 104, the first power transmission assembly 312 comprises a first transmission shaft 3121, a first power transmission member 3122 and a second power transmission member, the axial direction of the first transmission shaft 3121 is parallel to the axial direction of the forming pipeline 104, one end of the first transmission shaft 3121 is movably connected with the first fixed disk 103, the other end of the first transmission shaft is movably connected with the second fixed disk 105, and the first transmission shaft 3121 can rotate around the axial direction of the first transmission shaft.

The first power transmission member 3122 is disposed inside the power output end of the driving motor 311 and the first transmission shaft 3121, and the first power transmission member 3122 is used for power connection transmission between the driving motor 311 and the first transmission shaft 3121, specifically, the first power transmission member 3122 is a bevel gear power transmission structure.

The first power transmission member 3122 includes a driving spur gear 3123 and a driven outer gear ring 3124, the driving spur gear 3123 is coaxially and fixedly installed outside the first transmission shaft 3121, the driven outer gear ring 3124 is coaxially installed outside the forming pipe 104 through a bearing, and the driving spur gear 3123 and the driven outer gear ring 3124 are engaged with each other.

The second power transmission assembly 313 is disposed in an area between an inner cavity wall of the fixed housing 101 and an outer circumferential surface of the forming pipe 104, the second power transmission assembly 313 includes a mounting support 3131, a second transmission shaft 3132, and a third transmission shaft 3133, the mounting support 3131 is fixedly mounted on the outer circumferential surface of the forming pipe 104, an axial direction of the second transmission shaft 3132 is parallel to an axial direction of the forming pipe 104, the second transmission shaft 3132 is movably mounted on the mounting support 3131 and can rotate around an axial direction of the second transmission shaft 3132, the second transmission shaft 3132 is further coaxially and fixedly provided with a receiving spur gear 3133, and the receiving spur gear 3133 is engaged with the driven outer gear ring 3124.

The axial direction of the transmission shaft 3134 is parallel to the diameter direction of the forming pipe 104 at the straight line intersection point of the transmission shaft 3134, and the transmission shaft 3134 is movably mounted on the mounting support 3131 and can rotate around the self axial direction.

A power transmission element 3135 is disposed between the second transmission shaft 3132 and the third transmission shaft 3134, and power transmission is performed between the two through the power transmission element 3135, specifically, the power transmission element 3135 is a bevel gear power transmission structure.

The transmission shaft III 3134 and the screw rod 322 of the driving assembly are provided with a power transmission part IV 3136 therebetween, the power transmission part IV 3136 comprises an input straight gear and an output straight gear, the input straight gear is coaxially and fixedly arranged outside the transmission shaft III 3134, the output straight gear is coaxially sleeved outside the screw rod 322 in a thread mounting mode and is movably connected with the mounting support 3131, the output straight gear rotates around the self axial direction and can pull the screw rod 322 to displace along the self axial direction, and the output straight gear and the input straight gear are meshed with each other.

Four groups of power transmission assemblies 313 are correspondingly arranged.

During actual work, molten plastic provided by the plastic melting equipment sequentially flows into an area between an outer mold area and the outer surface of the inner mold body 200, which is formed by four groups of mold plates 321 together, through the feeding joint 102, a connecting hole arranged on the fixed end cover, a feeding section of an inner cavity of the inner mold body 200 and a feeding hole 201 arranged on the side surface of the inner mold body 200, and simultaneously cooling water flows in from a water inlet end of the inner mold body 200 and is discharged after passing through a cooling section of the inner cavity of the inner mold body 200 and a drainage pipeline 401, so that a flowing water cooling system for forming a square plastic pipeline is formed, and in the process, due to the existence of the vacuum pipeline I and the vacuum pipeline II, the flowing water cooling system does not influence the molten plastic in the pipe cavity of the feeding joint 102, and only provides a cooling effect for the molten plastic in the forming pipeline 104;

in the above process, if a square plastic pipe with another thickness needs to be produced, the driving motor 311 runs and drives the screw rod 322 to displace along the self axial direction through the cooperation of the first power transmission assembly 312 and the second power transmission assembly 313, that is, the four groups of driving assemblies displace along the self extending direction synchronously, so that the area of the outer mold region formed by the four groups of mold plates 321 is changed, and the outer mold region always keeps a square structure which is concentric with the inner mold body 200, until the region between the outer mold region and the inner mold body 200 meets the requirement of the plastic pipe in a new direction.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the technical principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims (8)

1. The die assembly for plastic pipeline molding is characterized by comprising a molding pipe head (100) and an outer die mechanism (300), wherein the feeding end of the molding pipe head (100) is coaxially and fixedly connected and communicated with the discharging end of plastic melting equipment, the outer die mechanism (300) is arranged on the molding pipe head (100), and the outer die mechanism (300) is used for providing an outer die for the molding process of a square plastic pipeline;

the outer die mechanism (300) comprises a thickness adjusting member (310) and an outer die member (320), wherein the outer die member (320) is used for providing an outer die for the square plastic pipeline forming process, the area of an outer die area provided by the outer die member (320) can be changed, and the thickness adjusting member (310) is used for providing power for the process that the outer die member (320) adjusts the area of the outer die area.

2. The mold assembly for molding the plastic pipeline as recited in claim 1, wherein the molding pipe head (100) comprises a fixed housing (101), a feeding joint (102), a first fixed disc (103), a second fixed disc (105) and a molding pipeline (104), the feeding joint (102) is a circular pipeline structure with openings at two ends, a fixed step coaxially extends from one open end of the feeding joint (102) to a direction away from the axis of the feeding joint, a fixed end cover is coaxially and fixedly arranged at the other open end, and the fixed step of the feeding joint (102) is coaxially and fixedly connected with the discharge end of the plastic melting equipment through a fastening bolt;

the fixed disc I (103) is of a circular ring-shaped plate structure, the fixed disc I (103) is coaxially and fixedly connected with the end face, deviating from the feeding joint (102), of the fixed end cover, the forming pipeline (104) is of a pipeline structure with openings at two ends, the forming pipeline (104) is coaxially and fixedly connected with the end face, deviating from the feeding joint (102), of the fixed disc I (103), the fixed disc II (105) is of a circular ring-shaped plate structure, and the fixed disc II (105) is coaxially and fixedly connected with the end face, deviating from the feeding joint (102), of the forming pipeline (104);

the fixed shell (101) is of a circular shell structure with an opening at one end and a closed end, the fixed shell (101) is coaxially and fixedly sleeved on the outer circular surfaces of the first fixed disk (103) and the second fixed disk (105), and the closed end of the fixed shell (101) is coaxially provided with a discharging joint communicated with the cavity of the forming pipeline (104).

3. The mold assembly for plastic pipe molding according to claim 2, wherein the outer mold member (320) comprises a mold plate (321) and a driving assembly, the mold plate (321) is a rectangular plate structure with a large surface parallel to the axial direction of the molding pipe (104), the mold plate (321) is arranged in the molding pipe (104) and one end of the mold plate (321) is in contact with the end surface of the fixed end cover departing from the feeding joint (102) and the other end of the mold plate is in contact with the bottom of the inner cavity of the fixed shell (101), the mold plate (321) is provided with four groups, and the four groups of mold plates (321) together form an outer mold area, and the outer mold area is in a square structure.

4. The mold assembly for molding the plastic pipe as claimed in claim 3, wherein the driving assembly comprises a screw rod (322) and a guide rod (323), the extension directions of the screw rod (322) and the guide rod (323) are both perpendicular to the axial direction of the molding pipe (104), one end of the screw rod (322)/the guide rod (323) is fixedly connected with the mold plate (321), the other end of the screw rod (322)/the guide rod (323) penetrates through the side wall of the molding pipe (104) and is located in the area between the outer circumferential surface of the molding pipe (104) and the cavity wall of the inner cavity of the fixed housing (101), and the screw rod (322)/the guide rod (323) are both displaceable along the extension direction thereof;

the driving assemblies are correspondingly provided with four groups, and when the four groups of driving assemblies synchronously displace along the extending direction of the driving assemblies, the area of an outer die area formed by the four groups of die plates (321) can be changed, and the outer die area is always in a square structure.

5. The mold assembly for plastic pipe molding according to claim 4, wherein the thickness adjusting member (310) comprises a driving motor (311), a first power transmission assembly (312) and a second power transmission assembly (313), the first power transmission assembly (312) is used for receiving the power of the driving motor (311) and transmitting the power to the second power transmission assembly (313), and the second power transmission assembly (313) is used for receiving the power given by the second power transmission assembly (313) and driving the four sets of driving assemblies to synchronously displace along the extending direction of the driving assemblies by using the power.

6. The mold assembly for molding plastic pipes according to claim 5, wherein the driving motor (311) is fixedly installed on the outer circumferential surface of the fixed housing (101), and the power output end of the driving motor (311) penetrates through the side wall of the fixed housing (101) and is located in the area between the inner cavity wall of the fixed housing (101) and the outer circumferential surface of the molding pipe (104), and the axial direction of the output shaft of the driving motor (311) is consistent with the diameter direction of the fixed housing (101) at the fixed point thereof.

7. The mold assembly for molding the plastic pipe as claimed in claim 6, wherein the first power transmission assembly (312) is disposed in an area between the cavity wall of the inner cavity of the stationary housing (101) and the outer circumferential surface of the molding pipe (104), the first power transmission assembly (312) comprises a first transmission shaft (3121), a first power transmission member (3122) and a second power transmission member, the axial direction of the first transmission shaft (3121) is parallel to the axial direction of the molding pipe (104), one end of the first transmission shaft (3121) is movably connected with the first stationary disk (103), the other end of the first transmission shaft is movably connected with the second stationary disk (105), and the first transmission shaft (3121) can axially rotate around itself;

the first power transmission piece (3122) is arranged in the power output end of the driving motor (311) and the first transmission shaft (3121), the first power transmission piece (3122) is used for power connection transmission between the driving motor (311) and the first transmission shaft (3121), and the first power transmission piece (3122) is a bevel gear power transmission structure;

the power transmission member I (3122) comprises a driving straight gear (3123) and a driven outer gear ring (3124), the driving straight gear (3123) is coaxially and fixedly mounted at the outer part of the transmission shaft I (3121), the driven outer gear ring (3124) is coaxially mounted at the outer part of the forming pipeline (104) through a bearing, and the driving straight gear (3123) and the driven outer gear ring (3124) are mutually meshed.

8. The mold assembly for molding plastic pipes according to claim 7, wherein the second power transmission assembly (313) is disposed in an area between the cavity wall of the inner cavity of the stationary housing (101) and the outer circumferential surface of the molding pipe (104), the second power transmission assembly (313) comprises a mounting bracket (3131), a second transmission shaft (3132) and a third transmission shaft (3133), the mounting bracket (3131) is fixedly mounted on the outer circumferential surface of the molding pipe (104), the second transmission shaft (3132) has an axial direction parallel to the axial direction of the molding pipe (104), the second transmission shaft (3132) is movably mounted on the mounting bracket (3131) and can rotate axially around itself, a receiving straight gear (3133) is further coaxially and fixedly disposed on the second transmission shaft (3132), and the receiving straight gear (3133) and the driven outer gear ring (3124) are engaged with each other;

the axial direction of the third transmission shaft (3134) is parallel to the diameter direction of the straight line intersection point of the forming pipeline (104) and the third transmission shaft (3134), and the third transmission shaft (3134) is movably arranged on the mounting support (3131) and can rotate around the self axial direction;

a power transmission piece III (3135) is arranged between the second transmission shaft II (3132) and the third transmission shaft III (3134), power connection and transmission are carried out between the second transmission shaft II and the third transmission shaft III (3135) through the power transmission piece III (3135), and the power transmission piece III (3135) is a bevel gear power transmission structure;

a power transmission part IV (3136) is arranged between the transmission shaft III (3134) and the screw rod (322) of the driving assembly, the power transmission part IV (3136) comprises an input straight gear and an output straight gear, the input straight gear is coaxially and fixedly arranged outside the transmission shaft III (3134), the output straight gear is coaxially sleeved outside the screw rod (322) in a threaded mounting mode and is also movably connected with the mounting bracket (3131), the output straight gear rotates around the self axial direction and can pull the screw rod (322) to displace along the self axial direction, and the output straight gear is meshed with the input straight gear;

four groups of power transmission assemblies (313) are correspondingly arranged.

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