Thermal insulation composite pipe forming device

Abstract

The invention discloses a heat insulation and heat preservation composite pipe forming device, and relates to the technical field of pipeline forming. The heat insulation and heat preservation composite pipe forming device comprises an inner pipe extrusion die, a heat preservation layer extrusion die, a blind hole forming mechanism and an outer skin extrusion die which are sequentially arranged. The inner pipe extrusion die is used for extruding an inner pipe, the heat preservation layer extrusion die is used for extruding a heat preservation layer and wrapping the outer surface of the inner pipe, the blind hole forming mechanism is used for punching an inner wall filling blind hole in the heat preservation layer when the heat preservation layer is not shaped, and the outer skin extrusion die is used for extruding an outer skin layer, wrapping the outer surface of the inner pipe and filling the filling blind hole. According to the heat insulation and heat preservation composite pipe forming device, due to the fact that the blind hole forming mechanism is arranged, the formed heat insulation and heat preservation composite pipe can form the filling blind hole in the heat preservation layer, the filling blind hole is filled with high-density polyethylene, and therefore the situation that an outer skin and the heat preservation layer are separated from each other due to the fact that the thermal expansion rates of the outer skin and the heat preservation layer are different is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pipe forming, in particular to a heat insulation composite pipe forming device. BACKGROUND

[0002] The heat insulation composite pipe is usually composed of an inner pipe, a polyurethane insulation layer and an outer skin, and the outer skin is usually high-density polyethylene. The polyurethane insulation pipe is made of high-function polyether polyol combined material and multiple methyl polyphenyl polyisocyanate as raw materials through chemical reaction foaming. The polyurethane insulation pipe is used for insulation and cooling engineering of various pipes indoors and outdoors, central heating pipes, central air conditioning pipes, chemical industry pipes, medical industry pipes and the like. Since the polyurethane synthetic material was born, the polyurethane foaming insulation pipe has been rapidly developed as an excellent heat insulation material, and its application range is also becoming more and more extensive. Moreover, due to its simple construction, energy saving and remarkable corrosion prevention effect, it is widely used in various pipes for heating, refrigeration, oil transportation and gas transportation.

[0003] The inner pipe and the insulation layer of the heat insulation composite pipe are usually provided with a mounting bracket. The mounting bracket increases the connection strength between the inner pipe and the insulation layer, and further increases the connection strength between the outer pipe and the insulation layer due to the greater pressure of the polyurethane insulation layer on the outer pipe.

[0004] However, the mounting bracket and the inner pipe bracket are in interference fit, so the mounting bracket is manually installed on the inner pipe, which leads to the inability to produce by one-step method if the mounting bracket is installed. This results in low production efficiency.

[0005] In order to improve the automation degree and production efficiency of the heat insulation composite pipe, the one-step forming method is usually used for production at present. For example, the utility model patent CN209534210U discloses a polyolefin polyurethane insulation composite pipe one-step forming equipment, in which the inner pipe, the foaming insulation layer and the outer pipe are formed by one-step method. For another example, the invention patent application CN113513638A discloses a heat insulation composite pipe forming device, in which the polyurethane insulation layer and the outer pipe are formed outside the inner pipe by one-step method.

[0006] Therefore, for the production of some heat insulation composite pipes, the mounting bracket is usually directly discarded, and the connection strength between the insulation layer and the inner pipe is improved by treating the outer wall of the inner pipe. However, the connection strength between the outer pipe and the insulation layer cannot be guaranteed.

[0007] However, in the use of such pipes, thermal expansion and cold contraction are more serious, but the thermal expansion rates of polyurethane and polyethylene are quite different.

[0008] The thermal expansion rate of polyurethane as the insulation layer is about 80x10 ⁻6 / ℃, and the thermal expansion rate of high-density polyethylene is about 150x10⁻6 The temperature difference between the outer protective layer and the polyurethane thermal insulation layer causes shear stress between the outer protective layer and the polyurethane thermal insulation layer under temperature difference cycles after long-term use, which causes delamination, and is manifested as longitudinal or circumferential bulging, and the forming device in the prior art cannot solve the problem. SUMMARY

[0009] In view of the deficiencies of the prior art, the present application provides a heat insulation composite pipe forming device, which solves the problem of delamination between the outer protective layer and the polyurethane thermal insulation layer under temperature difference cycles in the prior art, which is manifested as longitudinal or circumferential bulging.

[0010] To achieve the above purpose, the present application provides a heat insulation composite pipe forming device, which comprises an inner tube extrusion die, a thermal insulation layer extrusion die, a blind hole forming mechanism and an outer skin extrusion die arranged in sequence. The inner tube extrusion die is used to extrude an inner tube, the thermal insulation layer extrusion die is used to extrude a thermal insulation layer and coat the outer surface of the inner tube, and the outer skin extrusion die is used to extrude an outer skin and coat the outer surface of the inner tube and fill the blind hole. The blind hole forming mechanism comprises: A rotating belt is provided with at least three groups, and the at least three groups are arranged in a circular matrix on the outside of the thermal insulation layer. A U-shaped carrier is provided with multiple groups and is installed on each group of rotating belts at equal intervals. A forming die is arranged on the side of the U-shaped carrier away from the center line of the rotating belt. A pressure assembly is assembled on the side of the U-shaped carrier close to the center line of the rotating belt. A track table is located in the center line area of the rotating belt and is used to apply force to the pressure assembly to form a blind hole on the thermal insulation layer and solidify the blind hole during the rotation of the forming die.

[0011] Further, the forming die comprises: A carrier ring is slidingly arranged on the U-shaped carrier. A leaflet is hinged to one end of the carrier ring close to the thermal insulation layer, and the leaflet forms a columnar structure when it is not opened, and the inner wall of the leaflet has a slope. The pressure assembly is used to first push the carrier ring and the leaflet to move vertically, and then push the slope to open the leaflet.

[0012] Further, the pressure assembly comprises a force receiving rod, one end of the force receiving rod is fixed with a pressure plate one, a spring two is arranged between the pressure plate one and the carrier ring, one end of the force receiving rod close to the pressure plate one is fixedly provided with a pressure rod, the pressure rod extends into the carrier ring and is fixedly provided with a slope pressure plate. The side of the U-shaped carrier away from the rotating belt is provided with a limiting protrusion. The other end of the force bar is provided with a head, and a spring one is arranged between the head and the U-shaped carrier.

[0013] Further, the track table is provided with, from one end close to the heat preservation layer, a first inclined part, a first parallel part, a second inclined part, a parallel shaping part, a first upward inclined part, a second parallel part and a second upward inclined part in sequence.

[0014] Further, each group of the rotating belts is arranged in parallel and at intervals, and an unobstructed space is formed between the two rotating belts, and the U-shaped carrier and the track table are located between the corresponding two rotating belts.

[0015] Further, a framework is further arranged, and the framework is located on both sides of the rotating belt and is used for supporting the rotating belt, and the track table is fixed on the framework. The U-shaped carrier is provided with a side support rod on both sides, and the framework is provided with a side support track matched with the side support rod.

[0016] Further, a support, a driving mechanism and an end frame are further arranged, the support is located at both ends of the rotating belt and is located at the periphery of the heat preservation layer, and the end frame is fixed at the end of the framework. The driving mechanism comprises a sprocket fixed at one end of a shaft of a pulley of the rotating belt, and another sprocket is arranged at a position close to the sprocket, a worm wheel is arranged on the sprocket in a coaxial manner, a chain is arranged between the two sprockets, and the rotating belt is controlled to rotate by driving the worm wheel to rotate.

[0017] The present application has the following beneficial effects: (1) The heat insulation composite pipe forming device is provided with the blind hole forming mechanism, so that the heat insulation composite pipe formed by the heat insulation composite pipe forming device can form the filling blind hole on the heat preservation layer, the filling blind hole is filled with high-density polyethylene, and the part of the high-density polyethylene is integrated with the high-density polyethylene of the outer skin, so that the filling blind hole limits the outer skin from separating from the heat preservation layer by limiting the part of the high-density polyethylene from separating from the heat preservation layer, thereby greatly reducing the situation that the outer skin and the heat preservation layer are separated from each other and bulge due to the different thermal expansion rates of the outer skin and the heat preservation layer, ensuring the tightness of the connection between the two, thereby avoiding the situation that the service life of the pipeline is reduced due to a large amount of corrosive gas and liquid entering between the outer skin and the heat preservation layer.

[0018] (2) The heat insulation composite pipe forming device is provided with the rotating belt, the forming die located on the rotating belt and the track table arranged on the rotating path, so that the forming die can form the continuous process of the blind hole, shaping and demolding, thereby realizing efficient and continuous work.

[0019] Of course, any product implementing the present application does not necessarily need to achieve all the advantages described above. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a sectional view of the end face of the heat-insulating composite pipe of the present application; Figure 2 is an axial sectional view of the heat-insulating composite pipe of the present application; Figure 3 is a structural schematic view of the forming device of the heat-insulating composite pipe of the present application; Figure 4 is a structural schematic view of the blind hole forming mechanism of the forming device of the heat-insulating composite pipe of the present application; Figure 5 is a schematic view of the assembly of a single set of rotary belts on a support in the forming device of the heat-insulating composite pipe of the present application; Figure 6 is an enlarged view of area A of the present application; Figure 5 Figure 7 is a drive diagram of the rotary belt of the present application; Figure 8 is a first perspective view of the pressure assembly, forming die and U-shaped carrier of the present application; Figure 9 is a second perspective view of the pressure assembly, forming die and U-shaped carrier of the present application; Figure 10 is an exploded view of the present application; Figure 9 Figure 11 is a leaf opening diagram of the present application; Figure 12 is a sectional view of the U-shaped carrier of the present application.

[0021] In the figure, 100 is an inner pipe; 200 is a heat-insulating layer; 300 is an outer skin; 400 is a filled blind hole; 1 is a support; 2 is an annular frame; 3 is a blind hole forming mechanism; 41 is a large gear ring; 42 is a bevel gear ring; 43 is a motor; 44 is a chain; 45 is a sprocket; 46 is a worm; 47 is a bevel gear; 48 is a worm wheel; 5 is a rotary belt; 6 is a pressure assembly; 61 is a force rod; 62 is a spring one; 63 is a pressing plate one; 64 is a spring two; 65 is a pressing rod; 66 is a slope pressing plate; 67 is a head; 7 is a forming die; 71 is a carrier ring; 72 is a leaf; 73 is a slope; 8 is a side support track; 9 is an inner pipe extrusion die; 10 is an outer skin extrusion die; 11 is an end frame; 12 is a skeleton; 13 is a track table; 131 is a parallel shaping part; 132 is a first inclination part; 133 is a first parallel part; 134 is a second inclination part; 135 is a first upward inclination part; 136 is a second parallel part; 137 is a second upward inclination part; 14 is a heat-insulating layer extrusion die; 15 is a U-shaped carrier; 151 is a limiting protrusion; 152 is a side support rod; 16 is a polishing mechanism. DETAILED DESCRIPTION

[0022] The following is a detailed description of the present application according to the drawings. Figures 1-12 ​​The application discloses a heat-insulation composite pipe forming device.

[0023] The application provides a heat-insulation composite pipe, which comprises an inner pipe 100, a heat-insulation layer 200 and an outer skin 300 arranged in sequence from inside to outside, and the outer surface of the heat-insulation layer 200 is provided with a filling blind hole 400, and the outer skin 300 can not only cover the heat-insulation layer 200 but also fill the filling blind hole 400.

[0024] Preferably, the inner pipe 100 is formed by polypropylene or polyethylene extrusion, the heat-insulation layer 200 is formed by polyurethane extrusion, and the outer skin 300 is formed by high-density polyethylene extrusion.

[0025] Specifically, the filling blind hole 400 is formed on the surface of the polyurethane when the polyurethane is just extruded and not solidified, and high-density polyethylene is extruded on the outer surface of the polyurethane after solidification, the high-density polyethylene can be used as the outer skin 300 and can fill the filling blind hole 400.

[0026] The heat-insulation composite pipe has high-density polyethylene in the filling blind hole 400, and the high-density polyethylene is integrated with the high-density polyethylene of the outer skin 300, so that the filling blind hole 400 limits the separation of the outer skin 300 from the heat-insulation layer 200 by limiting the separation of the high-density polyethylene from the heat-insulation layer 200, avoids the separation of the outer skin 300 from the heat-insulation layer 200 due to the different thermal expansion rates of the outer skin 300 and the heat-insulation layer 200, guarantees the connection tightness of the two, and avoids the reduction of the service life of the pipe due to the entry of a large amount of corrosive gas or liquid between the outer skin 300 and the heat-insulation layer 200.

[0027] Preferably, the outer end diameter of the filling blind hole 400 is 1.1-1.3 times the thickness of the outer skin 300, so as to avoid the breakage of the high-density polyethylene in the filling blind hole 400 from the outer skin 300.

[0028] Optionally, the filling blind hole 400 of the pipe can be a blind hole with different inner end and outer end diameters, in the embodiment, the filling blind hole 400 is a circular truncated cone, the end with the larger diameter of the circular truncated cone is the inner end, and the end with the smaller diameter is the outer end, and this kind of mode can further limit the separation of the high-density polyethylene in the filling blind hole 400.

[0029] The application further provides a heat-insulation composite pipe forming device.

[0030] Please refer to Figure 3The heat insulation composite pipe forming device comprises an inner pipe extrusion die 9, a heat insulation layer extrusion die 14, a blind hole forming mechanism 3 and an outer skin extrusion die 10 arranged in sequence, the inner pipe extrusion die 9 is used for extruding an inner pipe 100, the heat insulation layer extrusion die 14 is used for extruding a heat insulation layer 200 and covering the outer surface of the inner pipe 100, the blind hole forming mechanism 3 is used for punching an inner wall filling blind hole 400 on the heat insulation layer 200 when the heat insulation layer 200 is not yet shaped, and the outer skin extrusion die 10 is used for extruding an outer skin 300 layer and covering the outer surface of the inner pipe 100 and filling the filling blind hole 400.

[0031] Figure 3 In the embodiment, the inner pipe extrusion die 9 is assembled on an extruder, and a polyurethane foaming machine and an outer skin 300 extruder are not shown in the figure, both of which are known technologies and will not be described here.

[0032] In combination with Figure 4 - Figure 7 As shown in the figure, the blind hole forming mechanism 3 mentioned above comprises a rotating belt 5, a U-shaped carrier 15, a forming die 7, a pressure assembly 6 and a track table 13.

[0033] The rotating belt 5 mentioned above is provided with at least three groups, and the at least three groups are arranged in a circular matrix outside the heat insulation layer 200, and in the embodiment, as shown in the figure, preferably, ten groups of rotating belts 5 are provided, and each group has two rotating belts 5, the two rotating belts 5 are arranged in parallel and spaced apart, and the space between the two rotating belts 5 is unobstructed, and as shown in the figure, the track table 13 is arranged between the two rotating belts 5. Figure 4 Figure 6 and Figure 7 For better understanding, the two rotating belts 5 have respective independent pulleys, the U-shaped carrier 15 is fixed between the two rotating belts 5, the closed end of the U-shaped carrier 15 is close to the inner side of the rotating belt 5, the open end of the U-shaped carrier 15 is close to the outer side of the U-shaped carrier 15, the U-shaped carrier 15 is provided with multiple groups and is fixed on each group of rotating belts 5 at equal intervals, so that the U-shaped carrier 15 can be rotated when the rotating belt 5 rotates. In the embodiment, the rotating belt 5 is a V-belt or a belt.

[0034] The forming die 7 mentioned above is arranged on the side of the U-shaped carrier 15 away from the center line of the rotating belt 5, the pressure assembly 6 is assembled on the side of the U-shaped carrier 15 close to the center line of the rotating belt 5, and the track table 13 is located in the center line area of the rotating belt 5, when the rotating belt 5 rotates the U-shaped carrier 15, the forming die 7 and the pressure assembly 6 on the U-shaped carrier 15 rotate synchronously, when the forming die 7 rotates to the position opposite to the heat insulation layer 200, the track table 13 can apply force to the pressure assembly 6, so that the forming die 7 forms the filling blind hole 400 on the heat insulation layer 200, and the filling blind hole 400 is solidified and formed during the rotation of the forming die 7, and the forming die 7 is separated from the filling blind hole 400 after the solidification of the filling blind hole 400 is completed.

[0035] In combination with Figures 8-12 ​As shown, specifically, the forming die 7 mentioned above comprises a carrier ring 71 which is slidingly arranged on the U-shaped carrier 15, a leaf 72 is hinged to the carrier ring 71 near the opening end of the U-shaped carrier 15, and a slope surface 73 is arranged on the inner wall of the leaf 72, which can be an inclined surface or an arc surface. When the forming die 7 rotates to be opposite to the thermal insulation layer 200, the pressure assembly 6 first pushes the carrier ring 71 and the leaf 72 to move vertically, so that the whole leaf 72 opens a cylindrical hole on the thermal insulation layer 200 in a closed posture, and then the pressure assembly 6 pushes the slope surface 73 to open the leaf 72, and the opening of the leaf 72 can make the cylindrical hole into a circular truncated cone blind hole.

[0036] Specifically, the pressure assembly 6 comprises a force receiving rod 61 which is slidingly arranged on the U-shaped carrier 15 along the length direction of the U-shaped carrier 15, one end of the force receiving rod 61 fixed in the U-shaped carrier 15 is provided with a pressing plate 63, the other end of the force receiving rod 61 is fixed with a head 67, a spring 62 is arranged between the head 67 and the U-shaped carrier 15, a spring 64 is arranged between the pressing plate 63 and the carrier ring 71, a pressing rod 65 is fixed to one end of the force receiving rod 61 close to the pressing plate 63, the pressing rod 65 extends into the carrier ring 71 and is fixed with a slope pressing plate 66, and a limiting protrusion 151 is arranged on the side of the U-shaped carrier 15 away from the rotating belt 5.

[0037] In this embodiment, when the head 67 is pressed, the force receiving rod 61 can be pushed to gradually push the pressing plate 63, the spring 64 and the whole forming die 7 to move close to the thermal insulation layer 200, so as to open a cylindrical blind hole, until the carrier ring 71 is blocked by the limiting protrusion 151, at this time the carrier ring 71 no longer moves, the pressing plate 63 starts to compress the spring 64, so that the pressing plate 63 continuously drives the pressing rod 65 to push the slope pressing plate 66, that is, the slope pressing plate 66 can push the leaf 72 to open.

[0038] Specifically, in order to realize the above-mentioned state that the track table 13 can press the head 67 in stages, not press and reset, the track table 13 is provided with a first inclined portion 132, a first parallel portion 133, a second inclined portion 134, a parallel shaping portion 131, a first upward inclined portion 135, a second parallel portion 136 and a second upward inclined portion 137 in sequence from the end close to the thermal insulation layer extrusion die 14, which cooperate with the pressure assembly 6.

[0039] In the embodiment, when the forming die 7 is not opposite to the heat preservation layer 200, i.e. the forming die 7 is located outside the rotating belt 5, the forming die 7 is in a state of being received by the U-shaped carrier 15, and the forming die 7 gradually rotates to the side opposite to the heat preservation layer 200 and does not contact the heat preservation layer 200, with the continuous rotation of the rotating belt 5, the pressure assembly 6 reaches the first inclined portion 132, the first inclined portion 132 applies the first pushing force to the head 67, so that the force rod 61 can gradually push the first pressing plate 63, the second spring 64 and the whole forming die 7 to approach the heat preservation layer 200, at this time, a cylindrical blind hole is formed on the heat preservation layer 200, and at this time, the carrier ring 71 is limited by the limiting protrusion 151, then the head 67 reaches the first parallel portion 133, at this time, the carrier ring 71 does not move any more, the first pressing plate 63 starts to compress the second spring 64, so that the first pressing plate 63 continuously drives the pressing rod 65 to push the slope pressing plate 66, i.e. the slope pressing plate 66 can push the leaf 72 to open, and the opening of the leaf 72 can make the cylindrical blind hole into a circular truncated cone blind hole; then the head 67 reaches the region of the parallel shaping portion 131, the length of the region is longer than that of the other regions, so that the circular truncated cone blind hole can be shaped, and after the shaping is completed, the head 67 sequentially reaches the first upward inclined portion 135, the second parallel portion 136 and the second upward inclined portion 137, so as to realize the purpose of gradually and stably taking out the forming die 7 from the circular truncated cone blind hole.

[0040] In the embodiment, during the working process, when the forming die 7 contacts the heat preservation layer 200, i.e. the head 67 corresponding to the forming die 7 contacts the track table 13, the two are kept synchronous and uniform motion, i.e. the two are kept in a relative static state in the extrusion direction.

[0041] In combination with Figures 5-7 As shown in the drawings, the heat insulation and heat preservation composite pipe forming device provided by the embodiment of the present application further comprises a framework 12, the framework 12 is located on both sides of the rotating belt 5 and is used for supporting the rotating belt 5, and the specific supporting mode is that the roller shaft of the end roller of the rotating belt 5 is rotatably installed on the framework 12, and the track table 13 is also fixed on the framework 12, the side supporting rod 152 is arranged on both sides of the U-shaped carrier 15, the side supporting track 8 matched with the side supporting rod 152 is arranged on the framework 12, so that the height stability of the U-shaped carrier 15 can be kept.

[0042] Preferably, the annular frame 2 is used for reinforcing between the frameworks 12.

[0043] In addition, in order to realize the synchronous rotation of the rotating belts 5, the support 1, the driving mechanism and the end frame 11 are further arranged.

[0044] The support 1 is located at both ends of the rotating belt 5 and outside the thermal insulation layer 200 and does not contact the thermal insulation layer 200. The end support 11 is fixed to the end of the framework 12. The driving mechanism comprises a sprocket 45 fixed to one end of the shaft of the pulley of the rotating belt 5 and another sprocket 45 arranged near the first sprocket 45. The coaxial worm wheel 48 is arranged on the sprocket 45. The chain 44 is arranged between the two sprockets 45. The rotation of the worm wheel 48 is controlled to rotate the rotating belt 5.

[0045] Specifically, the large gear ring 41 is arranged on the support 1. The small gear is arranged on the lower side of the large gear ring 41. The corresponding motor 43 is arranged. When the motor 43 rotates, the large gear ring 41 can be driven to rotate. The bevel gear ring 42 is fixedly arranged on the side of the large gear ring 41 near the rotating belt 5. The bevel gear 47 is engaged with the worm wheel 48 in the area opposite to the worm wheel 48. The worm gear 47 is coaxially arranged with the worm 46. The worm 46 can be engaged with the worm wheel 48 to drive the worm wheel 48. The bevel gear 47 and the worm 46 are coaxially connected and synchronously rotate. The bevel gear 47 and the worm 46 are rotatably arranged on the support 1.

[0046] As shown in Figure 1 Preferably, the polishing mechanism 16 is arranged between the thermal insulation layer extrusion die 14 and the outer skin extrusion die 10. The polishing mechanism 16 can ensure that the thermal insulation layer 200 after the blind hole is opened is flat. The polishing mechanism 16 is preferably provided with a negative pressure dust collection structure to suck the polyurethane debris generated after polishing.

[0047] In use, the inner tube extrusion die 9 first extrudes the inner tube 100, and after cooling and setting, enters the thermal insulation layer extrusion die 14, which extrudes polyurethane and coats it on the inner tube 100 to form the thermal insulation layer 200, which enters the blind hole forming mechanism 3 before setting. The following describes the way the blind hole forming mechanism 3 forms holes in the thermal insulation layer 200: when the rotating belt 5 rotates, it drives the U-shaped carrier 15 to rotate. When the forming die 7 is not opposite the thermal insulation layer 200, i.e. the forming die 7 is located outside the rotating belt 5, the forming die 7 is in the state of being received in the U-shaped carrier 15. The forming die 7 gradually rotates to the side opposite the thermal insulation layer 200 in this state, and the forming die 7 does not contact the thermal insulation layer 200. With the continuous rotation of the rotating belt 5, the pressure assembly 6 reaches the first inclined portion 132, which applies a first pushing force to the head 67, so that the force rod 61 can gradually push the first pressure plate 63, the second spring 64 and the entire forming die 7 to approach the thermal insulation layer 200. At this time, a cylindrical blind hole is opened in the thermal insulation layer 200, and the carrier ring 71 is limited by the limiting protrusion 151 at this time. Subsequently, the head 67 reaches the first parallel portion 133, at which time the cylindrical blind hole is maintained. Subsequently, the head 67 reaches the second inclined portion 134, at which time the carrier ring 71 no longer moves, and the first pressure plate 63 begins to compress the second spring 64, so that the first pressure plate 63 continuously drives the pressure rod 65 to push the slope pressure plate 66, i.e. the slope pressure plate 66 can push the petal 72 to open, and the opening of the petal 72 can form a circular truncated cone-shaped blind hole from the cylindrical blind hole. Subsequently, the head 67 reaches the region of the parallel setting portion 131, which has a longer length than the other regions, and can realize the setting of the circular truncated cone-shaped blind hole. After setting is completed, the head 67 sequentially reaches the first upward inclined portion 135, the second parallel portion 136 and the second upward inclined portion 137, achieving the purpose of step-by-step and stable extraction of the forming die 7 from the circular truncated cone-shaped blind hole.

[0048] The preferred embodiments disclosed above are only used to help explain the present application. The preferred embodiments do not describe all the details and do not limit the present application to the specific embodiments described. Obviously, many modifications and variations can be made according to the content of the present application. The present application is selected and specifically described in order to better explain the principles and practical applications of the present application, so that those skilled in the art can well understand and utilize the present application. The present application is limited only by the claims and their full scope and equivalents.

Claims

1. A heat-insulating composite pipe forming device, characterized in that, It includes an inner tube extrusion die (9), an insulation layer extrusion die (14), a blind hole forming mechanism (3), and an outer skin extrusion die (10) arranged in sequence. The inner tube extrusion die (9) is used to extrude the inner tube (100), the insulation layer extrusion die (14) is used to extrude the insulation layer (200) and cover the outer surface of the inner tube (100), and the outer skin extrusion die (10) is used to extrude the outer skin (300) and cover the outer surface of the inner tube (100) and fill the blind hole (400). The blind hole forming mechanism (3) includes: Rotary belt (5), the rotary belt (5) is provided with at least three sets, and the at least three sets are arranged in a circular matrix outside the insulation layer (200); U-shaped platform (15), the U-shaped platform (15) is provided in multiple sets and is installed at equal intervals on each set of rotating belts (5); Forming mold (7), the forming mold (7) is located on the side of the U-shaped platform (15) away from the center line of the rotating belt (5); Pressure assembly (6), which is assembled on one side of the U-shaped platform (15) near the centerline of the rotary belt (5); The track platform (13) is located in the center line area of ​​the rotating belt (5) and is used to apply force to the pressure component (6) so that the forming mold (7) forms a filling blind hole (400) on the insulation layer (200) and the filling blind hole (400) is solidified during the rotation of the forming mold (7).

2. The heat-insulating composite pipe forming device according to claim 1, characterized in that, The forming mold (7) includes: A carrier ring (71) is slidably disposed on a U-shaped platform (15); Leaflet (72), the leaflet (72) is hinged to one end of the carrier ring (71) near the insulation layer (200), the leaflet (72) forms a columnar structure when it is not open, and the inner wall of the leaflet (72) has a slope (73). The pressure assembly (6) is used to first push the carrier ring (71) and the leaflet (72) to move vertically, and then push the slope (73) to open the leaflet (72).

3. The heat-insulating composite pipe forming device according to claim 2, characterized in that, The pressure assembly (6) includes a force rod (61), one end of which is fixed with a pressure plate (63), and a spring (64) is provided between the pressure plate (63) and the carrier ring (71). A pressure rod (65) is fixed at one end of the force rod (61) near the pressure plate (63), and the pressure rod (65) extends into the carrier ring (71) and is fixed with a slope pressure plate (66). The U-shaped platform (15) has a limiting protrusion (151) on the side away from the rotating belt (5). The other end of the force-bearing rod (61) is equipped with a head (67), and a spring (62) is provided between the head (67) and the U-shaped platform (15).

4. A heat-insulating composite pipe forming device according to claim 2 or 3, characterized in that, The track platform (13) is provided with a primary tilting part (132), a primary parallel part (133), a secondary tilting part (134), a parallel shaping part (131), a primary upward tilting part (135), a secondary parallel part (136), and a secondary upward tilting part (137) that cooperate with the pressure assembly (6) starting from the end near the extrusion die (14) of the insulation layer (200).

5. The heat-insulating composite pipe forming device according to claim 1, characterized in that, Each set of rotating belts (5) is arranged in parallel and at intervals, forming an unobstructed space between the two rotating belts (5). The U-shaped platform (15) and the track platform (13) are located between the corresponding two rotating belts (5).

6. The heat-insulating composite pipe forming device according to claim 1, characterized in that, It also includes a frame (12), which is located on both sides of the rotating belt (5) and is used to support the rotating belt (5), and the track platform (13) is fixed on the frame (12); The U-shaped platform (15) is provided with side support rods (152) on both sides, and the frame (12) is provided with side support rails (8) adapted to the side support rods (152).

7. The heat-insulating composite pipe forming device according to claim 6, characterized in that, A bracket (1), a drive mechanism, and an end frame (11) are also provided. The bracket (1) is located at both ends of the rotating belt (5) and is located outside the insulation layer (200). The end frame (11) is fixed to the end of the frame (12). The drive mechanism includes: a sprocket (45) fixed at one end of the pulley shaft of the rotary belt (5), and another sprocket (45) set at a position close to it. A worm gear (48) is set on the sprocket (45) on the same axis. A chain (44) is set between the two sprockets (45). The rotation of the rotary belt (5) is controlled by driving the worm gear (48) to rotate.

Images