CN209955261U

CN209955261U - Composite coating die for 3PE outer corrosion prevention of bent pipe

Info

Publication number: CN209955261U
Application number: CN201920553232.8U
Authority: CN
Inventors: 曹恩; 乐建军; 董康伦
Original assignee: ZHEJIANG JINHU PLASTICS MACHINERY Co Ltd
Current assignee: ZHEJIANG JINHU PLASTICS MACHINERY Co Ltd
Priority date: 2019-04-22
Filing date: 2019-04-22
Publication date: 2020-01-17
Anticipated expiration: 2029-04-22

Abstract

The utility model provides a compound cladding mould that is used for outer anticorrosive of return bend 3PE, including the die body of mould, the die body is the cylinder, be equipped with gluing agent feed inlet and PE feed inlet on the die body, be connected with gluing agent extruder and PE extruder respectively, be equipped with two annular gluing agent die cavities and PE die cavities in the die body, and two annular PE runners and gluing agent runner, between PE runner and the PE die cavity, through porous intercommunication between gluing agent runner and the gluing agent die cavity, and be equipped with PE adjusting bolt and gluing agent adjusting bolt who adjusts the commodity circulation speed in intercommunicating pore department, the front side of die body is equipped with the discharge gate, both sides are equipped with preceding flange and the back flange that is used for adjusting gluing agent die cavity and PE die cavity ejection. Utility model is rational in infrastructure, convenient operation, can be with polyethylene material and gluing agent material with the even cladding of thinner thickness on return bend steel lattice surface, can guarantee the circumference homogeneity of material stream again, be fit for the return bend and carry out 3PE outer anticorrosive cladding.

Description

Composite coating die for 3PE outer corrosion prevention of bent pipe

Technical Field

The utility model relates to an outer anticorrosive production line technical field of return bend 3PE cladding formula, concretely relates to be used for outer anticorrosive compound cladding mould of return bend 3 PE.

Background

The outer anticorrosive layer of steel pipe 3PE divides 3 layers altogether, and the inlayer is epoxy anticorrosive coating, and the skin is the polyethylene protective layer, and the intermediate level is the adhesive bonding layer. The conventional process comprises the steps of firstly spraying epoxy resin powder on the surface of a steel pipe heated to a certain temperature, then coating an adhesive outside an epoxy layer by an extruder through an annular die, then coating a polyethylene protective layer outside the adhesive layer by another extruder through another annular die, and adhering the epoxy layer and the polyethylene protective layer together by the adhesive layer. And the bent pipe is manually wound with a polyethylene tape when 3PE external corrosion prevention is carried out, so that continuous production cannot be realized, and the efficiency is extremely low.

Because the bent pipe does not move in a straight line but moves in a spiral winding mode during continuous production, a coating mode is adopted when the bent pipe is subjected to external corrosion prevention operation.

According to the inspection, the traditional Chinese patent CN201621490029, namely a polyurethane heat-insulating steel pipe, comprises a steel pipe body, wherein an epoxy powder anticorrosive coating is sprayed on the outer surface of the steel pipe body, an adhesive layer is sprayed on the outer surface of the epoxy powder anticorrosive coating, a polyethylene anticorrosive coating is sprayed on the outer surface of the adhesive layer, a heat-insulating layer is pasted on the inner wall of the steel pipe body, and the heat-insulating layer is made of polyurethane. The polyethylene protective layer on the outermost layer of the steel pipe is sprayed and coated instead, and the preparation process is complex.

At present, no report is found on a mould for coating polyethylene by performing 3PE external corrosion prevention on a bent pipe.

Disclosure of Invention

The utility model aims to solve the technical problem that a compound cladding mould for return bend 3PE outer corrosion-resistant that rational in infrastructure, convenient operation is provided to foretell technical current situation.

The utility model provides a technical scheme that above-mentioned technical problem adopted does: the utility model provides a compound cladding mould that is used for outer anticorrosive of return bend 3PE, includes the die body of mould, its characterized in that: the die body is the cylinder, be equipped with gluing agent feed inlet and PE feed inlet on the die body, be connected with gluing agent extruder and PE extruder respectively, be equipped with two annular gluing agent die cavities and PE die cavities in the die body, and two annular PE runners and gluing agent runners, between PE runner and the PE die cavity, through porous intercommunication between gluing agent runner and the gluing agent die cavity, and be equipped with PE adjusting bolt and gluing agent adjusting bolt who adjusts logistics speed in intercommunicating pore department, the front side of die body is equipped with the discharge gate, both sides are equipped with preceding flange and the back flange that is used for adjusting gluing agent die cavity and PE die cavity ejection of compact speed around the die body.

As an improvement, the die body is cylindrical, and comprises an outer die, a distribution die core and an inner die which are coaxially arranged from outside to inside, wherein an adhesive feed port and a PE feed port are respectively arranged on the upper side and the right side of the outer die, two annular PE runners and adhesive runners are formed between the outer die and the distribution die core, an adhesive die cavity is formed between the front flange and the outer die as well as between the rear flange and the distribution die core as well as between the rear flange and the inner die.

Further, the inner mold is of a conical structure with the front end reducing diameter matched with the radian of the bent pipe, a discharge hole for PE and adhesive to be combined and flow out is formed between the upper wall of the front end of the inner mold and the lower end face of the front flange, and the vertical face of the discharge hole is located on the arc top of the bent pipe.

Still further, the taper angle of the inner die is 10 degrees.

Furthermore, the number of the PE adjusting bolts and the number of the adhesive adjusting bolts are multiple, one PE adjusting bolt is arranged on each communicating hole between the PE runner and the PE die cavity, and one adhesive adjusting bolt is arranged on each communicating hole between the adhesive runner and the adhesive die cavity.

And furthermore, a connecting hole used for connecting a front flange is formed in the front end of the outer die in the axial direction, the front flange is adjustably connected and fixed with the outer die through bolts, and a screw hole for placing a plurality of PE adjusting bolts is formed in the middle of the front flange in the circumferential direction.

Still further, the rear end of external mold links to each other and has seted up the connecting hole, and the rear end of centre form links to each other and has seted up the connecting screw, and the rear flange passes through the bolt to be connected fixedly with the rear end of external mold, centre form, and the middle part of rear flange ring is seted up the screw that supplies a plurality of gluing agent adjusting bolt to put into, still is equipped with the adjusting screw that is used for adjusting the ejection of compact of gluing agent die cavity on the rear flange.

Furthermore, a vacuumizing seat is arranged on the rear side of the die body, a support used for mounting the vacuumizing seat is arranged on the rear flange, a vacuumizing port is formed in the support, and the vacuumizing seat is mounted on the rear side of the rear flange in an eccentric angle mode.

And finally, the vacuum-pumping seat is detachably arranged, and when steel pipes with different bending radiuses are coated, the vacuum-pumping seat with different eccentric angles can be replaced.

Compared with the prior art, the utility model has the advantages of: the mould is provided with two feed inlets which are respectively connected with the adhesive extruder and the PE extruder, two annular mould cavities and annular flow passages are arranged in the mould, the annular mould cavities and the annular flow passages are communicated in a porous way, and each hole corresponds to one adjusting screw; the inner die is conical to adapt to the radian of the bent pipe; the vacuumizing seat adopts an eccentric angled mode. Utility model is rational in infrastructure, convenient operation, can be with polyethylene material and gluing agent material with the even cladding of thinner thickness on return bend steel lattice surface, can guarantee the circumference homogeneity of material stream again, be fit for the return bend and carry out 3PE outer anticorrosive cladding.

Drawings

Figure 1 is a front view of an embodiment of the present invention,

fig. 2 is a sectional view taken along line a-a of fig. 1.

Detailed Description

The present invention will be described in further detail with reference to the following embodiments.

As shown in fig. 1 and 2, a composite cladding mold for external corrosion protection of a bent pipe 3PE is a co-extrusion mold, and includes a mold body 100 of the mold, the mold body 100 is cylindrical, the mold body 100 includes an external mold 1, a distribution mold core 2 and an internal mold 3, which are coaxially arranged from outside to inside, and a front flange 4 and a rear flange 5 are arranged on the front and rear sides of the mold body 100; the upper end and the right end of the outer die 1 are provided with an adhesive feed port 11 and a PE feed port 12 which are respectively connected with an adhesive extruder and the PE extruder, two annular PE runners 20 and an adhesive runner 10 are formed between the outer die 1 and the distribution die core 2, annular adhesive die cavities are formed between the front flange 4 and the outer die 1 and between the distribution die core 2 in the die body 100, adhesive die cavities are formed between the rear flange 5 and the distribution die core 2 and between the rear flange 5 and the distribution die core 3, the PE runners 20 and the PE die cavities, the adhesive runner 10 and the adhesive die cavities are communicated through a plurality of holes, PE adjusting bolts 6 and adhesive adjusting bolts 7 for adjusting the logistics speed are arranged at the communication holes, the front flange 4 and the rear flange 5 are respectively arranged at the front side and the rear side of the die body 1, and the; the inner die 3 is of a conical structure with the front end reduced in diameter matched with the radian of the bent pipe 50, the conical angle alpha of the inner die 3 is 10 degrees, a discharge hole 30 for combining and flowing out of PE and adhesive is formed between the upper wall of the front end of the inner die 3 and the lower end face of the front flange 4, and the vertical surface of the discharge hole 30 is positioned on the arc top of the bent pipe 50; the adhesive molding die comprises a front die 1, a front flange 4, an outer die 1, a plurality of PE adjusting bolts 6, a plurality of adhesive adjusting bolts 7, a plurality of connecting holes, a plurality of connecting bolts, a plurality of screw holes and a plurality of connecting holes, wherein the connecting holes are formed in each connecting hole between a PE flow channel 20 and a PE die cavity; the rear end of the outer die 1 is provided with a connecting hole in the axial direction, the rear end of the inner die 3 is provided with a connecting screw hole in the axial direction, the rear flange 5 is fixedly connected with the rear ends of the outer die 1 and the inner die 3 through bolts 9, the middle part of the rear flange 5 is provided with screw holes for placing a plurality of adhesive adjusting bolts 7 in the circumferential direction, and the rear flange 5 is also provided with adjusting screws 40 for adjusting the discharging of an adhesive die cavity; the rear side of the die body 100 is provided with a vacuumizing seat 60, the rear flange 5 is provided with a support for mounting the vacuumizing seat 60, the support is provided with a vacuumizing port 601, the vacuumizing seat 60 is mounted on the rear side of the rear flange 5 in an eccentric angle mode, the vacuumizing seat 60 is detachably arranged, and when steel pipes with different bending radiuses are coated, the vacuumizing seat 60 with different eccentric angles can be replaced.

During operation, the molten adhesive material and the PE material that adhesive extruder and PE extruder extruded get into annular adhesive runner 10 and PE runner from adhesive feed inlet 11 and PE feed inlet 12 respectively, the regulation through adhesive adjusting bolt 7 and PE adjusting bolt 6 makes adhesive material and PE material evenly get into adhesive die cavity and PE die cavity from the intercommunicating pore of circumference, then through the regulation of preceding flange 4 and back flange 4, make adhesive material and PE material meet in the discharge gate 30 department of die body front side, evenly coat on the steel lattice surface of return bend 50 with thinner thickness.

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

Claims

1. The utility model provides a compound cladding mould that is used for outer anticorrosive of return bend 3PE, includes the die body of mould, its characterized in that: the die body is the cylinder, be equipped with gluing agent feed inlet and PE feed inlet on the die body, be connected with gluing agent extruder and PE extruder respectively, be equipped with two annular gluing agent die cavities and PE die cavities in the die body, and two annular PE runners and gluing agent runners, between PE runner and the PE die cavity, through porous intercommunication between gluing agent runner and the gluing agent die cavity, and be equipped with PE adjusting bolt and gluing agent adjusting bolt who adjusts logistics speed in intercommunicating pore department, the front side of die body is equipped with the discharge gate, both sides are equipped with preceding flange and the back flange that is used for adjusting gluing agent die cavity and PE die cavity ejection of compact speed around the die body.

2. The composite overmold of claim 1, wherein: the adhesive injection mold comprises a mold body, an adhesive inlet, a PE inlet, a distribution mold core, a front flange, a distribution mold core and a rear flange, wherein the mold body is cylindrical and comprises an outer mold, the distribution mold core and an inner mold which are coaxially arranged from outside to inside, the adhesive inlet and the PE inlet are respectively arranged on the upper side and the right side of the outer mold, two annular PE runners and adhesive runners are formed between the outer mold and the distribution mold core, an adhesive mold cavity is formed between the front flange and the outer mold.

3. The composite overmold of claim 2, wherein: the centre form is the toper structure with the radian matched with front end undergauge of return bend, forms the discharge gate that supplies PE and gluing agent can merge the outflow between the front end upper wall of centre form and the lower terminal surface of preceding flange, and the perpendicular of discharge gate is located the arc top of return bend.

4. The composite overmold of claim 2, wherein: the taper angle of the inner die is 10 degrees.

5. The composite overlay mold of any of claims 2-4 wherein: the adhesive flow channel is characterized in that the number of the PE adjusting bolts and the number of the adhesive adjusting bolts are multiple, one PE adjusting bolt is arranged on each communicating hole between the PE flow channel and the PE die cavity, and one adhesive adjusting bolt is arranged on each communicating hole between the adhesive flow channel and the adhesive die cavity.

6. The composite overmold of claim 5, wherein: the front end of the outer die is provided with a connecting hole in the axial direction for connecting a front flange, the front flange is adjustably connected and fixed with the outer die through bolts, and the middle part of the front flange is provided with screw holes for placing a plurality of PE adjusting bolts in the circumferential direction.

7. The composite overmold of claim 5, wherein: the rear end of the outer die is provided with connecting holes in the axial direction, the rear end of the inner die is provided with connecting screw holes in the axial direction, the rear flange is fixedly connected with the rear ends of the outer die and the inner die through bolts, the middle part of the rear flange is provided with screw holes for the plurality of adhesive adjusting bolts to be placed in the axial direction, and the rear flange is further provided with adjusting screws for adjusting the discharging of an adhesive die cavity.

8. The composite overlay mold of any of claims 1-4 wherein: the rear side of the die body is provided with a vacuumizing seat, the rear flange is provided with a support for mounting the vacuumizing seat, the support is provided with a vacuumizing port, and the vacuumizing seat is mounted on the rear side of the rear flange in an eccentric angle mode.

9. The composite overmold of claim 8, wherein: the vacuum-pumping seat is detachably arranged, and when steel pipes with different bending radiuses are coated, the vacuum-pumping seat with different eccentric angles can be replaced.