CN112428498A

CN112428498A - Forming tool and preparation method of polyurethane lining pipeline

Info

Publication number: CN112428498A
Application number: CN202011468676.5A
Authority: CN
Inventors: 蔺小刚; 苏玉林; 张洪森; 周楠杰; 刘伟; 董水仓
Original assignee: LUOYANG CHENGCHUANG WEAR-RESISTANT MATERIALS CO LTD
Current assignee: LUOYANG CHENGCHUANG WEAR-RESISTANT MATERIALS CO LTD
Priority date: 2020-12-15
Filing date: 2020-12-15
Publication date: 2021-03-02

Abstract

A forming tool for a polyurethane lining pipeline and a preparation method thereof are provided, wherein the tool comprises flanges, flange seal plates and an inner core, and the flanges are fixedly connected to two ends of the pipeline to be formed; the flange sealing plate is fixed on the outer side of the end face of the flange, and a positioning hole in clearance fit with the inner core is formed in the flange sealing plate; the inner core is in a straight tube shape with the length larger than that of the pipeline, the inner core penetrates through the positioning hole, two ends of the inner core are arranged outside the pipeline, and a cavity for pouring polyurethane is defined by the outer wall of the inner core, the inner wall of the pipeline, the flange and the flange sealing plate; and the flange seal plate is provided with a pouring hole for pouring polyurethane into the cavity and an exhaust hole for exhausting air in the cavity. The invention not only can form a cavity for pouring polyurethane outside the pipeline to be formed, and accurately control the thickness of the polyurethane lining layer by controlling the thickness of the cavity, but also can enable the cavity to produce the lining pipeline with an eccentric polyurethane layer by eccentric arrangement.

Description

Forming tool and preparation method of polyurethane lining pipeline

Technical Field

The invention belongs to the technical field of lining pipeline preparation, and particularly relates to a forming tool and a preparation method of a polyurethane lining pipeline.

Background

In the ore dressing process of a mine, ore pulp is generally conveyed through a pipeline, the polyurethane lining pipe has better elasticity due to the fact that the lining polyurethane has the advantage that when the polyurethane is impacted by a medium, the polyurethane is forced to be compressed under the action of external force, and after the external force disappears, the polyurethane is restored to the original state, so that abrasion caused by direct strong scouring of the medium on the inner wall of the pipeline is greatly reduced.

The lining pipe in current polyurethane is when the preparation, often adopt centrifugal casting to make the steel pipe inner wall form the resistant wearing layer of one deck polyurethane, however, because the straightness accuracy of steel pipe is not enough, lead to the thickness and the homogeneity of the resistant wearing layer of unable accurate control polyurethane in the in-process of lining pipe in preparation polyurethane, in addition, to horizontal transport's pipeline, because medium action of gravity, the wearing and tearing that the inner wall that is in the pipeline bottom received are more serious than pipeline top inner wall, the lining pipe in polyurethane often can not reuse because of the bottom wearing and tearing is comparatively serious, the extravagant serious in pipeline top lining polyurethane life-span, the life deviation that leads to the lining pipe in polyurethane is great.

Disclosure of Invention

In order to solve the problems, the invention provides a forming tool and a preparation method of a polyurethane lining pipeline, which can form a cavity for pouring polyurethane outside a pipeline to be formed, accurately control the thickness of a polyurethane lining layer by controlling the thickness of the cavity, and enable the cavity to produce the lining pipeline with an eccentric polyurethane layer by eccentric arrangement.

The technical scheme adopted by the invention to solve the technical problems is as follows:

a forming tool for a polyurethane lining pipeline comprises flanges, flange seal plates and an inner core, wherein the flanges are used for being fixed at two ends of a pipeline to be processed; the flange sealing plate is used for being fixed on the outer side of the end face of the flange, and a positioning hole in clearance fit with the inner core is formed in the flange sealing plate; the inner core is in a straight tube shape with the length larger than that of the pipeline, the inner core penetrates through the positioning hole, two ends of the inner core are arranged outside the pipeline, and a cavity for pouring polyurethane is defined by the outer wall of the inner core, the inner wall of the pipeline, the flange and the flange sealing plate;

and the flange seal plate is provided with a pouring hole for pouring polyurethane into the cavity and an exhaust hole for exhausting air in the cavity.

Furthermore, the flange is provided with a positioning boss, a cavity for pouring the polyurethane flanging is formed by the positioning boss and the flange sealing plate in a surrounding mode, and the cavity is communicated with the cavity.

Furthermore, the pouring hole penetrates through the cavity from the outer circular surface of the flange sealing plate and is communicated with the cavity, and the exhaust hole penetrates through the cavity from the plane of the flange sealing plate and is communicated with the cavity.

Furthermore, an annular groove is formed in the upper edge of the flange sealing plate and embedded with a sealing ring, and the sealing ring is fixedly compressed by an annular pressing plate fixed on the outer side of the flange sealing plate.

Further, the positioning hole is concentric or eccentric with the pipeline.

Further, the forming tool for the polyurethane lining pipeline further comprises a supporting device, the supporting device comprises a support, a plurality of arc-shaped brackets for supporting the pipeline are fixed on the support, and the central connecting line of the brackets is linear and is obliquely arranged relative to the horizontal plane.

Furthermore, the supporting device also comprises an arc-shaped bracket pressing plate, and the pipeline is tightly pressed by fixedly mounting the bracket pressing plate on the bracket.

A preparation method of a polyurethane lining pipeline comprises the following steps:

fixing flanges at two ends of a pipeline to be formed, and then placing an inner core in the pipeline, so that two ends of the inner core extend out of the flanges;

step two, sleeving a flange seal plate on the periphery of the inner core and fixing the flange seal plate on the end face of the flange to obtain an assembly part with a cavity enclosed by the outer wall of the inner core, the inner wall of the pipeline, the flange and the flange seal plate;

step three, pouring polyurethane into the cavity of the assembly part prepared in the step two from the pouring hole, and preparing a poured assembly part after the cavity is filled with polyurethane;

and step four, after the polyurethane in the cavity of the cast assembly part obtained in the step three is solidified, sequentially removing the flange seal plate and the inner core to obtain a cast pipe body, and vulcanizing the cast pipe body to obtain the polyurethane lining pipeline.

Furthermore, the assembly parts in the third step are fixed on a plurality of arc brackets through arc bracket pressing plates, and the central connecting line of the brackets is linear and is obliquely arranged relative to the horizontal plane.

Furthermore, a straight line formed by the central connecting line of the bracket forms an included angle of 15-20 degrees relative to the horizontal plane.

Further, the concrete step of filling polyurethane into the cavity in the third step is as follows: the shutoff of the exhaust hole of lower one end, pour into polyurethane liquid from the pouring hole of higher one end flange shrouding, treat when polyurethane liquid will spill over the pouring hole of lower one end flange shrouding, the pouring hole of the lower one end flange shrouding of shutoff, continue to pour into polyurethane liquid, treat when polyurethane liquid will spill over the exhaust hole of higher one end flange shrouding, the exhaust hole of the higher one end flange shrouding of shutoff, treat when polyurethane liquid will spill over the pouring hole of higher one end flange shrouding, the pouring hole of the higher one end flange shrouding of shutoff, accomplish the pouring of shaping intracavity polyurethane liquid.

The invention has the beneficial effects that:

1. the flanges and the flange seal plates are arranged at the two ends of the pipeline to be formed, the inner core is arranged in the pipeline, the outer wall of the inner core, the inner wall of the pipeline, the flanges and the flange seal plates jointly enclose a cavity for pouring polyurethane, and the thickness of the polyurethane lining can be accurately controlled and the uniformity of the polyurethane lining can be improved by controlling the thickness of the cavity.

2. The positioning hole of the flange sealing plate can be arranged to be eccentric with the pipeline, so that the eccentric design of the cavity is realized, the polyurethane lining pipe with the eccentric polyurethane lining can be produced through the eccentric cavity, the problem that the service life deviation of the polyurethane lining pipe is larger due to the fact that the inner wall of the bottom of the pipeline is abraded more seriously than the inner wall of the top of the pipeline can be effectively solved, and the service life of the polyurethane pipeline produced by adopting polyurethane materials with the same weight is maximized.

3. The pipeline is fixed through the bracket and the bracket pressing plate, so that the straightness of the pipeline is improved, and the uniformity of the polyurethane lining is further improved.

4. The bracket is obliquely arranged in the pouring process, so that air in the cavity can be smoothly discharged, bubbles are prevented from being mixed in polyurethane due to air residue in the pouring process, and the forming effect of the polyurethane after pouring is improved.

Description of the drawings:

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of the overall structure during forming and casting;

FIG. 3 is a schematic view of the structure in the direction B-B in FIG. 2;

FIG. 4 is a schematic view showing the structure of a polyurethane lined pipe.

The labels in the figure are: 1. the device comprises a positioning boss, 2, a flange, 3, a pipeline, 4, a polyurethane lining, 5, a polyurethane flanging, 6, a screw, 7, a pressing plate, 8, a sealing ring, 9, an inner core, 10, an exhaust hole, 11, a pouring hole, 12, a flange sealing plate, 13, a pressing plate fixing screw, 14, a first fixing bolt, 15, a support, 16, a bracket, 17, a bracket pressing plate, 18, a second fixing bolt, 19 and a cavity.

Detailed Description

The invention is further described with reference to the following figures and detailed description.

As shown in fig. 1 to 4, a forming tool for a polyurethane-lined pipeline comprises a flange 2, a flange closing plate 12 and an inner core 9, wherein the flange 2 is fixedly connected to two ends of a pipeline 3 to be processed; the flange seal plate 12 is fixed on the outer side of the end face of the flange 2, a positioning hole in clearance fit with the inner core 9 is formed in the flange seal plate 12, and the flange seal plate 12 can be fixedly installed on the flange 2 through a first fixing bolt 14; the inner core 9 is in a straight tube shape with the length larger than that of the pipeline 3, during specific implementation, the inner core 9 can be made of a steel tube, the straightness of the outer cylindrical surface reaches above IT12 level, and the smoothness reaches above Ra3.2, so that the straight tube shape of the inner core 9 is ensured, the inner core 9 penetrates through the positioning hole and is arranged in the pipeline 3, and the outer wall of the inner core 9, the inner wall of the pipeline 3, the flange 2 and the flange sealing plate 12 jointly define a cavity 19 for pouring polyurethane; the flange seal plate 12 is provided with a pouring hole 11 and an exhaust hole 10, the pouring hole 11 and the exhaust hole 10 are both communicated with the cavity 19, in specific implementation, the pouring hole 11 can penetrate through the cavity from the outer circular surface of the flange seal plate 12 to be communicated with the cavity 19, the exhaust hole 10 can penetrate through the cavity from the plane of the flange seal plate 12 to be communicated with the cavity 19, and the exhaust hole 10 can be communicated with the pouring hole 11 in implementation.

Further, the flange 2 is provided with a positioning boss 1 protruding outwards, a positioning groove matched with the positioning boss 1 can be formed in the flange sealing plate 12 to facilitate fixing of the flange 2 and the flange sealing plate 12, a cavity used for pouring the polyurethane flanging 5 is formed between the positioning boss 1 and the flange sealing plate 12 in a surrounding mode, the cavity is communicated with the cavity 19, namely the cavity belongs to a part of the cavity 19, the formed polyurethane lining 4 can form the polyurethane layer flanging 5 extending to the positioning boss 1 through the cavity, the polyurethane flanging 5 forms a sealing layer, and sealing performance of the manufactured polyurethane lining pipes in mutual connection can be improved.

Further, follow the locating hole is equipped with the ring channel, the ring channel is embedded to have sealing washer 8, sealing washer 8 is by fixing the annular pressing plate 7 fixed compression in the flange shrouding 12 outside, during the concrete implementation, can use 10mm thick steel sheet preparation annular pressing plate 7, and set up on annular pressing plate 7 with flange shrouding 12 assorted mounting hole, can set up annular shrouding 7 internal diameter to 1 ~ 2mm than the internal core 9 external diameter greatly, pressing plate 7 is fixed on flange shrouding 12 by clamp plate set screw 13, sealing washer 8 can be the O-ring sealing washer, sealing washer 8 can be 120 ℃ high temperature resistant best, improve the leakproofness between internal core 9 and flange shrouding 12 through sealing washer 8.

When the positioning hole and the pipeline 3 are concentrically arranged, the cavity 19 is a cavity with uniform thickness, the thickness of the obtained polyurethane lining 4 can be accurately controlled by controlling the thickness of the cavity 19, when the positioning hole and the pipeline 3 are eccentrically arranged, the cavity 19 is an eccentric tubular cavity with unequal thickness, different pipelines with eccentric polyurethane linings 4 can be prepared by controlling the eccentricity of the cavity 19, and the phenomenon that the service life deviation of the polyurethane lining pipe is larger because the inner wall at the bottom of the pipeline is more seriously worn than the inner wall at the top of the pipeline can be effectively avoided by arranging the corresponding surface of a thick polyurethane layer of the pipeline downwards.

Further, the forming tool for the polyurethane lining pipeline further comprises a supporting device, the supporting device comprises a support 15, a plurality of arc-shaped brackets 16 used for supporting the pipeline 3 are fixed on the support 15, and the central connecting line of the brackets 16 is linear and is obliquely arranged relative to the horizontal plane.

During specific implementation, M12 screw thread can be attacked on pouring hole 11 and exhaust hole 10, place behind strutting arrangement when pipeline 3, with the exhaust hole 10 shutoff of the flange shrouding 12 of lower one end with screw 6, the flange shrouding 12 exhaust hole 10 that is in higher one end is used for discharging the air in the die cavity 19, the smooth discharge of the interior air of die cavity 19 when conveniently pouring like this, in addition, 10# channel-section steel welding preparation can be chooseed for use to support 15, the bottom and the horizontal plane of support 15 flush, bracket 16 can set up 3, the line of center of bracket 16 forms 15-20 contained angles with the bottom of support 15.

Further, the supporting device further comprises an arc-shaped bracket pressing plate 17 fixed on the bracket 16, the bracket pressing plate 17 can be fixedly installed on the bracket 16 through a second fixing bolt 18, the bracket pressing plate 17 can be manufactured after being rolled by a steel plate, the pipeline 3 is tightly fixed through the bracket pressing plate 17, and when the pipeline 3 is not straight, the pipeline 3 can be corrected to be in a consistent parallel state with a central connecting line of the bracket 16 through the bracket pressing plate 17.

firstly, fixing flanges 2 at two ends of a pipeline 3 to be processed, enabling an inner core 9 to penetrate through the pipeline 3, selecting the size of the flange 2 according to a polyurethane lining pipe to be prepared, welding the flange 2 at two ends of the pipeline 3, then performing sand blasting treatment on the inner wall of the pipeline 3 with the welded flange 2 and the convex surface of the flange 2, brushing an adhesive after cleaning, cleaning the inner core 9, the flange sealing plate 12, the pressing plate 7, the screws 6, the pressing plate fixing screws 13, the first fixing bolts 14 and the O-shaped sealing ring 8, and spraying a release agent.

Step two, the flange seal plate 12 is sleeved into the inner core 9 and fixed on the flange 2 to obtain an assembly part to be poured, in the specific implementation, if the positioning hole of the flange seal plate 12 is concentrically arranged with the pipeline 3, the flange seal plate 12 can be turned without adjusting, if the positioning hole of the flange seal plate 12 is eccentrically arranged with the pipeline 3, the flange seal plate 12 is rotated to enable the eccentricity of the positioning hole on the flange seal plate 12 at the two ends of the pipeline 3 to face the same direction, after the flange seal plate 12 is fixed, an O-shaped seal ring 8 is embedded into an annular seal groove of the flange seal plate 12, and then the flange seal plate is compressed by an annular pressure plate 7.

And step three, pouring the assembly part in the step two, injecting polyurethane into the cavity 19 through the pouring hole 11, exhausting air in the cavity 19 through the exhaust hole 10, plugging the exhaust hole 10 and the pouring hole 11 after the cavity 19 is filled with the polyurethane, and obtaining the poured assembly part.

And step four, after the polyurethane in the cavity 19 of the assembly part after pouring obtained in the step three is solidified, sequentially removing the flange seal plate 12 and the inner core 9 to obtain a pouring pipe body, and vulcanizing the pouring pipe body to obtain the polyurethane lining pipeline.

In specific implementation, the cast assembly obtained in the step three can be placed in an oven, the flange sealing plate 12 and the inner core 9 are removed after heat preservation treatment is carried out at the temperature of 100-; putting the pouring pipe body into an oven, vulcanizing at the temperature of 100-.

Further, before the pouring in the third step, the assembly parts can be fixed on a plurality of arc-shaped brackets 16, the central connecting line of the brackets 16 is linear and is obliquely arranged relative to the horizontal plane, when the concrete implementation is carried out, the assembly parts obtained in the second step can be quickly placed on the support 15 after being preheated at 110 ℃, the outer wall of the pipeline 3 is supported by the brackets 16, then the bracket pressing plate 17 is pressed, and the second fixing bolt 18 is used for fixing and pressing, so that the pipeline 3 is in a straightening state, and the straight line of the central connecting line of the brackets 16 forms an included angle of 15-20 degrees with the horizontal plane, so that air in the cavity 19 can be better discharged when the polyurethane is poured.

Further, the concrete pouring process of filling the cavity 19 with polyurethane in the third step is as follows: screw 6 is twisted to exhaust hole 10 of the flange shrouding 12 that will be located lower end and carries out the shutoff, pour into polyurethane liquid from the pouring hole 11 of the flange shrouding 12 of higher one end, and observe the pouring hole 11 of low flange shrouding 12, when finding that there is polyurethane liquid to spill over from low pouring hole 11 soon, twist screw 6 immediately and carry out the shutoff, then observe exhaust hole 10 of eminence flange shrouding 12 again, when discovering exhaust hole 10 of eminence flange shrouding 12 will have polyurethane liquid to spill over, twist screw 6 immediately and carry out the shutoff, continue to pour, until the pouring hole 11 of the flange shrouding 12 of higher one end has polyurethane to spill over, with this pouring hole 11 shutoff with screw 6, stop to pour into and can fill up polyurethane liquid in the die cavity 19.

By implementing the invention, not only can a cavity for pouring polyurethane be formed outside the pipeline to be formed, but also the thickness of the polyurethane lining layer can be accurately controlled by controlling the thickness of the cavity, and the cavity can be used for producing the lining pipeline with the eccentric polyurethane lining by eccentric arrangement.

It should be noted that the above embodiments are only for illustrating the present invention, but the present invention is not limited to the above embodiments, and any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention fall within the protection scope of the present invention.

Claims

1. The forming tool for the polyurethane lining pipeline is characterized by comprising a flange (2), a flange closing plate (12) and an inner core (9), wherein the flange (2) is used for being fixed at two ends of a pipeline (3) to be processed; the flange sealing plate (12) is used for being fixed on the outer side of the end face of the flange (2), and a positioning hole in clearance fit with the inner core (9) is formed in the flange sealing plate (12); the inner core (9) is in a straight tube shape with the length larger than that of the pipeline (3), the inner core (9) penetrates through the positioning hole, two ends of the inner core (9) are arranged outside the pipeline (3), and a cavity (19) for pouring polyurethane is defined by the outer wall of the inner core (9), the inner wall of the pipeline (3), the flange (2) and the flange sealing plate (12) together;

and the flange seal plate (12) is provided with a pouring hole (11) for pouring polyurethane into the cavity (19) and an exhaust hole (10) for exhausting air in the cavity (19).

2. The forming tool for the polyurethane-lined pipeline as claimed in claim 1, wherein the flange (2) is provided with a positioning boss (1), a cavity for pouring the polyurethane flange (5) is defined between the positioning boss (1) and the flange sealing plate (12), and the cavity is communicated with the cavity (19).

3. The forming tool for the polyurethane lining pipeline as claimed in claim 2, wherein the pouring hole (11) penetrates from the outer circumferential surface of the flange closing plate (12) to the cavity to be communicated with the cavity (19), and the exhaust hole (10) penetrates from the plane of the flange closing plate (12) to the cavity to be communicated with the cavity (19).

4. The forming tool for the polyurethane lining pipeline as claimed in claim 2, wherein the flange seal plate (12) is provided with an annular groove along the positioning hole, a seal ring (8) is embedded in the annular groove, and the seal ring (8) is fixedly pressed by an annular pressing plate (7) fixed on the outer side of the flange seal plate (12).

5. The forming tool for the polyurethane lining pipe as claimed in claim 1, wherein the positioning hole is concentric or eccentric with the pipe (3).

6. The forming tool for the polyurethane lining pipe as claimed in claim 1, wherein the forming tool for the polyurethane lining pipe further comprises a supporting device, the supporting device comprises a support (15), a plurality of arc-shaped brackets (16) used for supporting the pipe (3) are fixed on the support (15), and a central connecting line of the brackets (16) is linear and is inclined relative to a horizontal plane.

7. The forming tool for the polyurethane lining pipe as claimed in claim 7, wherein the supporting device further comprises an arc-shaped bracket pressing plate (17), and the pipe (3) is tightly pressed by the bracket pressing plate (17) which is fixedly arranged on the bracket (16).

8. A preparation method of a polyurethane lining pipeline is characterized by comprising the following steps: the forming preparation method by using the forming tool for the polyurethane lining pipeline as claimed in any one of claims 1 to 7 comprises the following steps:

fixing flanges (2) at two ends of a pipeline (3) to be processed, and then placing an inner core (9) in the pipeline (3) to enable two ends of the inner core (9) to extend out of the flanges (2);

step two, sleeving a flange seal plate (12) into the periphery of the inner core (9) and fixing the flange seal plate on the end face of the flange (2) to obtain an assembly part with a cavity (19) which is defined by the outer wall of the inner core (9), the inner wall of the pipeline (3), the flange (2) and the flange seal plate (12) together;

step three, pouring polyurethane into the cavity (19) of the assembly part prepared in the step two from the pouring hole (11), and preparing a poured assembly part after the cavity (19) is filled with the polyurethane;

and step four, after the polyurethane in the cavity (19) of the cast assembly part obtained in the step three is solidified, sequentially removing the flange seal plate (12) and the inner core (9) to obtain a cast pipe body, and vulcanizing the cast pipe body to obtain the polyurethane lining pipeline.

9. The method for preparing the polyurethane lining pipe as claimed in claim 8, wherein the assembly in step three is fixed on a plurality of arc brackets (16) through arc bracket pressing plates (17), and the central connecting line of the brackets (16) is linear and is arranged obliquely relative to the horizontal plane.

10. The method of claim 9, wherein a line connecting the centers of the brackets (16) forms an angle of 15 to 20 ° with the horizontal plane.

11. The method for preparing the polyurethane-lined pipe according to claim 9, wherein the step three of filling the cavity (19) with polyurethane comprises the following specific steps: the exhaust hole (10) shutoff of lower one end, pour into polyurethane liquid from pouring hole (11) of higher one end flange shrouding (12), wait that polyurethane liquid will overflow when pouring hole (11) of lower one end flange shrouding (12), pouring hole (11) of lower one end flange shrouding (12) of shutoff, continue to pour into polyurethane liquid, wait that polyurethane liquid will overflow exhaust hole (11) of higher one end flange shrouding (12), exhaust hole (11) of the higher one end flange shrouding (12) of shutoff, wait that polyurethane liquid will overflow pouring hole (11) of higher one end flange shrouding (12), pouring hole (11) of the higher one end flange shrouding (12) of shutoff, accomplish the pouring of polyurethane liquid in molding chamber (19).