A forming device for mesh steel skeleton reinforced composite pipe

Abstract

The present invention discloses a forming device for a mesh steel skeleton reinforced composite pipe, comprising a machine base and a forming inner mold and a forming outer mold arranged on the machine base, wherein the forming outer mold is concentrically sleeved on the outer periphery of the forming inner mold, and a forming channel is formed between the forming inner mold and the forming outer mold for facilitating the passage of the mesh steel skeleton and the passage of plastic fluid, the forming inner mold is provided with a shaping section, and correspondingly, a positioning shaping mechanism for positioning and shaping the mesh steel skeleton is also provided at a position corresponding to the shaping section on the machine base. The forming device can shape the mesh steel skeleton during the forming process, thereby improving the forming quality of the composite pipe.

Description

Technical Field

[0001] The invention relates to a forming device, belongs to the technical field of composite pipe forming, and is used in the production of composite pipes reinforced with mesh steel skeletons. Background Art

[0002] The mesh steel skeleton reinforced composite pipe is a new type of composite pipe. A mesh steel skeleton is added to the ordinary plastic pipe. The mesh steel skeleton is formed into a tubular structure by curling and welding the mesh steel strip, and then the reinforced skeleton enters the molding device for molding. The molding device mainly includes a molding inner mold and a molding outer mold. The molding outer mold is connected to the extruder. The mesh steel skeleton enters the molding channel between the molding inner mold and the molding outer mold. The plastic extruded by the extruder flows into the molding channel between the outer mold and the inner mold to wrap the steel skeleton to form a composite pipe. However, the current molding device still has the following shortcomings during use:

[0003] 1. During the forming process, although the mesh steel skeleton is curled and welded into a tubular structure through the upstream process, it will be deformed during the welding and curling process, and the steel skeleton is not completely cylindrical. As a result, the strength of the composite pipe formed after entering the forming device is uneven;

[0004] 2. The inner mold of the extruder needs to be cooled. The current cooling effect is not good, so the inner wall of the composite pipe is not smooth.

[0005] 3. Although the inner hole of the composite tube is in contact with the inner mold, in the actual production process, the contact between the inner hole and the inner mold is not very consistent. Therefore, the inner diameter size of the composite tube may fluctuate, which is prone to errors.

[0006] 4. The position of the material ring of the current molding outer mold is difficult to adjust, and there is an annular channel between the material ring and the outer molding core mold. Once the position of the material ring is not installed accurately, the width of the annular channel will be uneven, which will lead to uneven thickness of the inner and outer plastic layers of the steel skeleton, thereby affecting the strength of the composite pipe;

[0007] 5. The position of the die of the current molding outer mold is also difficult to adjust, which will also affect the external dimensions of the composite tube. At the same time, the replacement of the die and the material ring is relatively complicated. When composite tubes of different sizes need to be made, the entire molding outer mold needs to be disassembled, and then the die and the material ring need to be replaced, which is a relatively complicated operation.

[0008] 6. At present, the outer mold needs to go through a certain distance after the die is sized before entering the cooling box for cooling. When the composite pipe with a higher temperature passes through this gap distance, the plastic fluid of the composite pipe is relatively soft and may collapse, or the fluid in the upper part of the composite pipe flows downward due to gravity, resulting in a thicker plastic thickness at the lower part of the composite pipe. In this way, the quality of the composite pipe cannot be controlled. Summary of the invention

[0009] The technical problem to be solved by the present invention is to provide a forming device for a mesh steel skeleton reinforced composite pipe, wherein the forming device can shape the mesh steel skeleton during the forming process to improve the forming quality of the composite pipe.

[0010] In order to solve the above technical problems, the technical solution of the present invention is: a forming device for a porous steel skeleton reinforced composite pipe, comprising a machine base and a forming inner mold and a forming outer mold arranged on the machine base, the forming outer mold is concentrically sleeved on the outer periphery of the forming inner mold, and a forming channel is formed between the forming inner mold and the forming outer mold for facilitating the passage of the porous steel skeleton and the plastic fluid, the forming inner mold is provided with a shaping section, and correspondingly, a positioning and shaping mechanism for positioning and shaping the porous steel skeleton is also provided at a position corresponding to the shaping section on the machine base.

[0011] As a preferred scheme, the positioning and shaping mechanism includes at least one set of first shaping roller group and at least one set of second shaping roller group, the first shaping roller group includes a first upper shaping roller and a first lower shaping roller arranged vertically, the second shaping roller group includes a first left shaping roller and a first right shaping roller arranged horizontally, the first upper shaping roller and the first lower shaping roller cooperate with each other to shape the mesh steel skeleton from the upper and lower directions, and the first left shaping roller and the first right shaping roller cooperate with each other to shape the mesh steel skeleton from the left and right directions.

[0012] As a preferred solution, the molding inner mold is sequentially provided with the shaping section, the upstream mold section and the downstream mold section, the shaping section is connected to the upstream end of the upstream mold section, the outer periphery of the shaping section is provided with a shaping structure, the outer periphery of the upstream mold section is provided with an inner molding flow channel for facilitating the flow of materials, the upstream mold section and the downstream mold section are connected through an upstream connecting seat, the downstream end of the downstream mold section is provided with a downstream connecting seat, a cooling cylinder is provided between the downstream connecting seat and the upstream connecting seat, and a gap is formed between the outer periphery of the cooling cylinder and the inner wall of the downstream mold section. A cooling channel is formed, and an inlet pipe and a return pipe are installed in the inner molding mold. The downstream end of the inlet pipe is installed on the upstream connecting seat or the downstream connecting seat. Correspondingly, the downstream end of the return pipe is installed on the downstream connecting seat or the upstream connecting seat. The upstream connecting seat and the downstream connecting seat are respectively provided with an upstream connecting channel and a downstream connecting channel. The upstream connecting channel connects the cooling channel with the inlet pipe or the return pipe installed on the upstream connecting seat, and the downstream connecting channel connects the cooling channel with the return pipe or the inlet pipe installed on the downstream connecting seat.

[0013] As a preferred solution, a negative pressure vacuum tube is also fixed in the inner molding mold, a suction channel is provided on the downstream connecting seat, and a plurality of suction holes are provided on the outer periphery of the downstream end of the corresponding downstream mold section, and the downstream end of the negative pressure vacuum tube is connected with the suction hole through the suction channel.

[0014] As a preferred solution, the outer periphery of the cooling cylinder is provided with spirally arranged spiral blades, and a spiral cooling channel is formed between the spiral blades and the inner wall of the downstream mold section.

[0015] As a preferred solution, the shaping section includes a first shaping mold section, a second shaping mold section and a third shaping mold section. The first shaping mold section and the second shaping mold section are connected by a first connecting tube, and the second shaping mold section and the third shaping mold section are connected by a second connecting tube. A shaping ring is arranged on the outside of the first connecting tube and the second connecting tube. A plurality of guide protrusions supporting the inner wall of the mesh steel skeleton are arranged on the circumference of the shaping ring. At least one group of positioning keys is also arranged on the outer periphery of the first shaping mold section. Each group of positioning keys is evenly distributed on the outer periphery of the first shaping mold section. Each positioning key is provided with a positioning arc surface concentric with the forming inner mold. Each group of positioning keys is adapted to the first shaping roller group.

[0016] As a preferred scheme, the molding outer mold includes a mold frame, which is fixedly connected to one end of a feed mold barrel, the feed mold barrel is provided with a feed channel which is connected to the discharge port of the extruder, and the other end of the feed mold barrel is fixed with an outer molding core mold with a center hole, the feed mold barrel is detachably mounted with a material ring adjustment seat, the material ring adjustment seat is provided with a material ring mounting groove, a material ring is arranged in the material ring mounting groove, the material ring is fixed to the material ring adjustment seat by a material ring adjustment mechanism, an inclined annular channel connected to the feed channel is arranged between the material ring and the outer molding core mold, a mouth mold adjustment seat is detachably fixed at the end of the material ring adjustment seat, the mouth mold adjustment seat is provided with a mounting through hole, an outer molding ring and a mouth mold are respectively mounted in the mounting through hole by a shaping adjustment mechanism and a mouth mold adjustment mechanism, and the inner hole of the outer molding ring is provided with discrete shaping teeth which are contacted and shaped with the outer peripheral surface of the mesh steel skeleton.

[0017] As a preferred solution, the material ring adjustment mechanism includes at least four first tightening bolts, and the material ring adjustment seat is circumferentially evenly distributed with first radial screw holes that are adapted to the first tightening bolts. The first tightening bolts are installed one by one in the first radial screw holes, and the inner end of each first tightening bolt tightens the material ring.

[0018] As a preferred solution, the downstream end of the die is connected to a cooling device, which includes a cooling box body, a partition plate is provided in the cooling box body, the partition plate divides the cooling box body into a cooling chamber and an overflow chamber, the partition plate is provided with an overflow port, the upstream side wall, the downstream side wall and the partition plate of the cooling box body are all provided with through holes for convenient penetration of the composite pipe, a cold ring is fixed on the outer side of the upstream side wall of the cooling box body, the inner hole of the cold ring is adapted to the outer diameter of the composite pipe, and an annular spray pipe for spraying toward the cold ring is provided on the inner side of the upstream side wall, the spray pipe is connected to the water inlet pipe, and the overflow chamber is connected to the drain pipe.

[0019] As a preferred solution, an annular groove is provided on the end face of the cold ring close to the die, and an annular protrusion is provided at the corresponding end of the die. The annular protrusion is inserted into the annular groove for positioning and fitting, and the annular protrusion and the annular groove do not contact each other. An insulating polyfluoro ring is provided between the cold ring and the die, and the cooling box is fixed to the die adjustment seat or the die mounting plate.

[0020] After adopting the above technical scheme, the effect of the present invention is: since the forming inner mold is provided with a shaping section, a positioning and shaping mechanism for positioning and shaping the mesh steel skeleton is also provided at a position corresponding to the shaping section on the machine base. Therefore, the positioning and shaping mechanism can first shape the mesh steel skeleton to make it more regular, and at the same time position the shaping section of the forming inner mold to fix the inner mold, so that the strength uniformity obtained after compounding is higher.

[0021] Furthermore, since the positioning shaping mechanism includes at least one set of first shaping roller group and at least one set of second shaping roller group, the first shaping roller group includes a first upper shaping roller and a first lower shaping roller arranged vertically, and the second shaping roller group includes a first left shaping roller and a first right shaping roller arranged horizontally, the first upper shaping roller and the first lower shaping roller cooperate with each other to shape the mesh steel skeleton from the vertical direction, and the first left shaping roller and the first right shaping roller cooperate with each other to shape the mesh steel skeleton from the horizontal direction. The positioning shaping mechanism has a reasonable structure, the first shaping roller group shapes from the vertical direction, and the second shaping roller group shapes from the horizontal direction, so that the shaping effect is better.

[0022] Furthermore, since the molding inner mold is sequentially provided with the shaping section, the upstream mold section and the downstream mold section, the shaping section is connected to the upstream end of the upstream mold section, the outer periphery of the shaping section is provided with a shaping structure, the outer periphery of the upstream mold section is provided with an inner molding flow channel for facilitating the flow of materials, the upstream mold section and the downstream mold section are connected via an upstream connecting seat, the downstream end of the downstream mold section is provided with a downstream connecting seat, a cooling cylinder is provided between the downstream connecting seat and the upstream connecting seat, and a cooling channel is formed between the outer periphery of the cooling cylinder and the inner wall of the downstream mold section, and the molding inner mold is installed There are an inlet pipe and a return pipe, the downstream end of the inlet pipe is installed on the upstream connecting seat or the downstream connecting seat, and correspondingly, the downstream end of the return pipe is installed on the downstream connecting seat or the upstream connecting seat. The upstream connecting seat and the downstream connecting seat are respectively provided with an upstream connecting channel and a downstream connecting channel. The upstream connecting channel connects the cooling channel with the inlet pipe or the return pipe installed on the upstream connecting seat, and the downstream connecting channel connects the cooling channel with the return pipe or the inlet pipe installed on the downstream connecting seat. The cooling effect of the molding inner mold is better, so that the inner wall of the composite pipe is smoother when it is molded.

[0023] Since a negative pressure vacuum tube is also fixed in the molding inner mold, a suction channel is arranged on the downstream connecting seat, and a plurality of suction holes are arranged on the outer periphery of the downstream end of the corresponding downstream mold section. The downstream end of the negative pressure vacuum tube is connected with the suction holes through the suction channel. The negative pressure vacuum tube can be used to generate negative pressure at the suction holes, so that the composite tube can fit better on the downstream mold section, and the diameter of the inner hole can be more accurate.

[0024] Furthermore, since the outer periphery of the cooling cylinder is provided with spirally arranged spiral blades, a spiral cooling channel is formed between the spiral blades and the inner wall of the downstream mold section. Thus, the cooling channel can allow the cooling water to flow in a spiral manner, resulting in a better cooling effect.

[0025] Furthermore, since the shaping section includes a first shaping mold section, a second shaping mold section and a third shaping mold section, the first shaping mold section and the second shaping mold section are connected by a first connecting tube, and the second shaping mold section and the third shaping mold section are connected by a second connecting tube, a shaping ring is arranged outside the first connecting tube and the second connecting tube, and a plurality of guide protrusions supporting the inner wall of the mesh steel skeleton are arranged on the circumference of the shaping ring, and at least one group of positioning keys are also arranged on the outer circumference of the first shaping mold section, and each group of positioning keys are evenly distributed on the outer circumference of the first shaping mold section, and each positioning key is provided with a positioning arc surface concentric with the forming inner mold, and each group of positioning keys is adapted to the first shaping roller group. The shaping section is divided into three sections, so that the shaping ring can be arranged better, and the guide protrusion can well support the inner wall of the mesh steel skeleton and reduce deformation. The positioning arc surface concentric with the forming inner mold on the positioning key can better determine the center of the forming inner mold, so that it can better cooperate with the outer mold and be concentric, and the positioning effect is better.

[0026] Furthermore, since the molding outer mold includes a mold frame, the mold frame is fixedly connected to one end of a feed mold barrel, the feed mold barrel is provided with a feed channel which is connected to the discharge port of the extruder, and the other end of the feed mold barrel is fixed with an outer molding core mold with a center hole, the feed mold barrel is detachably mounted with a material ring adjustment seat, the material ring adjustment seat is provided with a material ring mounting groove, a material ring is arranged in the material ring mounting groove, the material ring is fixed to the material ring adjustment seat by a material ring adjustment mechanism, an inclined annular channel connected to the feed channel is arranged between the material ring and the outer molding core mold, a mouth mold adjustment seat is detachably fixed at the end of the material ring adjustment seat, a mounting through hole is arranged on the mouth mold adjustment seat, an outer molding ring and a mouth mold are respectively mounted in the mounting through hole by a shaping adjustment mechanism and a mouth mold adjustment mechanism, and the inner hole of the outer molding ring is provided with discrete shaping teeth which are contacted and shaped with the outer peripheral surface of the mesh steel skeleton. The positions of the material ring, the outer shaping ring and the die can be adjusted through the material ring adjustment mechanism, the shaping adjustment mechanism and the die adjustment mechanism, and finally the molding inner die of the remaining composite pipe is made concentric, ensuring that the plastic layer of the composite pipe is more uniform and the sizing of the composite pipe is more accurate. At the same time, the inner hole of the outer shaping ring is provided with discrete shaping teeth that contact and shape the outer peripheral surface of the mesh steel skeleton. Therefore, the mesh steel skeleton contacts the shaping teeth during operation, so once the mesh steel skeleton has irregular deformation, it will be shaped by the shaping teeth. Finally, the regular mesh steel skeleton makes the strength of the composite pipe more uniform.

[0027] Since the downstream end of the die is connected to a cooling device, the cooling device includes a cooling box, a partition plate is provided in the cooling box, the partition plate divides the cooling box into a cooling chamber and an overflow chamber, an overflow port is provided on the partition plate, and through holes are provided on the upstream side wall, downstream side wall and partition plate of the cooling box for convenient penetration of the composite pipe. A cold ring is fixed on the outer side of the upstream side wall of the cooling box, the inner hole of the cold ring is adapted to the outer diameter of the composite pipe, and an annular spray pipe for spraying toward the cold ring is provided on the inner side of the upstream side wall, the spray pipe is connected to the water inlet pipe, and the overflow chamber is connected to the drain pipe. In this way, the composite pipe after sizing by the die enters the cooling box through the cold ring. The cold ring is sprayed by the spray pipe to maintain a low temperature, and the cold ring contacts the surface of the composite pipe, so that the surface of the composite pipe is cooled first, so that the surface is smoother. The composite pipe after cooling by the cold ring enters the cooling chamber as soon as possible. After the cooling water sprayed by the spray pipe enters the cooling chamber and gradually fills it, the cooling water flows into the overflow chamber from the overflow port and then flows out of the overflow chamber. The cooling effect of the cooling device is better and the quality of the composite pipe can be better guaranteed.

[0028] Furthermore, since an annular groove is provided on the end face of the cold ring close to the die, an annular protrusion is provided on the corresponding end of the die, the annular protrusion is inserted into the annular groove for positioning and fitting, and the annular protrusion and the annular groove do not contact, an insulating polytetrafluoroethylene ring is provided between the cold ring and the die, and the cooling box is fixed to the die adjustment seat or the die mounting plate. The insulating polytetrafluoroethylene ring can be used to isolate the heat of the die and reduce the heat transferred to the cold ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0030] Figure 1 is a three-dimensional structural diagram of an embodiment of the present invention;

[0031] Figure 2 is a front schematic diagram of an embodiment of the present invention;

[0032] Figure 3 is a cross-sectional view of the molding outer mold and the cooling device;

[0033] Figure 4 It is a schematic diagram of the structure of the outer shaping ring;

[0034] Figure 5 It is a three-dimensional diagram of the inner mold;

[0035] Figure 6 It is a structural schematic diagram of the positioning key on the first shaping die section of the forming inner die;

[0036] Figure 7 is a cross-sectional view of a first shaping die segment and a second shaping die segment of a forming inner die;

[0037] Figure 8 It is a cross-sectional view of the upstream mold section and the downstream mold section of the molding inner mold;

[0038] In the attached drawings: 1. base; 2. inner molding mold; 21. first shaping mold section; 22. second shaping mold section; 23. third shaping mold section; 24. upstream mold section; 241. inner molding flow channel; 25. downstream mold section; 26. first connecting cylinder; 27. upstream connecting seat; 28. downstream connecting seat; 29. ​​cooling cylinder; 210. water inlet pipe; 211. positioning key; 212. shaping ring; 2121. guide protrusion; 213. cooling channel; 214. return pipe; 215. downstream connecting channel; 216. upstream vacuum pipe; 217. suction channel; 218. suction hole; 219. downstream vacuum pipe; 220. second connecting cylinder; 221. upstream connecting channel; 3. outer molding mold; 31. mold frame; 32. feed mold cylinder; 33. material ring adjustment seat; 34. outer molding core mold; 35. material ring; 36. Material ring adjustment mechanism; 37. Annular channel; 38. Mouth die mounting plate; 39. External shaping ring; 391. Shaping teeth; 310. Mouth die; 311. Mouth die adjustment seat; 312. Mouth die adjustment mechanism 312; 313. Shaping adjustment mechanism 313; 314. Partition plate; 315. Pad; 316. Heat-insulating polytetrafluoroethylene ring; 4. Cooling device; 41. Cooling chamber; 42. Partition plate; 43. Overflow chamber; 44. Overflow port; 45. Spray pipe; 46. Cold ring; 5. Positioning shaping mechanism; 51. First shaping roller group; 511. First roller frame; 512. First upper shaping roller; 513. First lower shaping roller; 514. Upper roller seat; 515. Up and down adjustment mechanism; 52. Second shaping roller group; 521. First left shaping roller; 522. First right shaping roller; 523. Left and right adjustment mechanism. DETAILED DESCRIPTION

[0039] The present invention is further described in detail below through specific examples.

[0040] like Figures 1 to 8 As shown, a forming device for a porous steel skeleton reinforced composite pipe comprises a machine base 1 and a forming inner mold 2 and a forming outer mold 3 arranged on the machine base 1, wherein the forming outer mold 3 is concentrically sleeved on the outer periphery of the forming inner mold 2, and a forming channel is formed between the forming inner mold 2 and the forming outer mold 3 for facilitating the passage of the porous steel skeleton and the passage of the plastic fluid, the forming inner mold 2 is provided with a shaping section, and correspondingly, a positioning and shaping mechanism 5 for positioning and shaping the porous steel skeleton is also provided at a position corresponding to the shaping section on the machine base 1.

[0041] like Figure 1 and Figure 2 As shown, the positioning and shaping mechanism 5 includes at least one set of first shaping roller group 51 and at least one set of second shaping roller group 52. In this embodiment, the first shaping roller group 51 and the second shaping roller group 52 are two sets respectively and are arranged at intervals and staggered.

[0042] The first shaping roller group 51 includes a first upper shaping roller 512 and a first lower shaping roller 513 which are arranged up and down. The first upper shaping roller 512 and the first lower shaping roller 513 cooperate with each other to shape the mesh steel skeleton from the up and down directions. The position of the first lower shaping roller 513 is not adjustable, and its lower roller seat is fixed on the first roller frame 511. Of course, in order to ensure that the first lower shaping roller 513 is concentric with the forming inner mold, a pad is arranged on the first roller frame 511 to determine the installation position of the first lower shaping roller 513. The position of the first upper shaping roller 512 is adjustable up and down, and the upper roller seat 514 is installed on the first roller frame 511 through an up and down adjustment mechanism 515, and the up and down adjustment mechanism 515 is adjusted by a screw adjustment mechanism.

[0043] The second shaping roller group 52 includes a first left shaping roller 521 and a first right shaping roller 522 arranged on the left and right sides. The first left shaping roller 521 and the first right shaping roller 522 cooperate with each other to shape the mesh steel skeleton from the left and right directions. The position of the first left shaping roller 521 and the left and right positions of the first right shaping roller 522 are adjustable. The left roller seat and the right roller seat are slidably installed on the second roller frame, and the left and right adjustments are achieved through the left and right adjustment mechanism 523. At this time, the left and right adjustment mechanism 523 can use a double-headed screw adjustment mechanism to achieve synchronous adjustment, and of course, it can also use a cylinder or a cylinder to achieve automatic adjustment.

[0044] In this embodiment, the first shaping roller set 51 and the second shaping roller set 52 are respectively two sets and are arranged at intervals. The first shaping roller set 51 and the second shaping roller set can also be combined and installed on the same set of roller frames, and shaping in the up-down and left-right directions can also be achieved.

[0045] like Figures 5 to 8As shown, the molding inner mold 2 is sequentially provided with the shaping section, the upstream mold section 24 and the downstream mold section 25, the shaping section is connected to the upstream end of the upstream mold section 24, the outer periphery of the shaping section is provided with a shaping structure, the shaping section includes a first shaping mold section 21, a second shaping mold section 22 and a third shaping mold section 23, the first shaping mold section 21 and the second shaping mold section 22 are connected by a first connecting tube 26, the second shaping mold section 22 and the third shaping mold section 23 are connected by a second connecting tube 220, the outer periphery of the first connecting tube 26 and the second connecting tube 220 are connected to each other, and the outer periphery of the first connecting tube 26 and the second connecting tube 220 is provided with a shaping structure, and the shaping section includes a first shaping mold section 21, a second shaping mold section 22 and a third shaping mold section 23, and the first shaping mold section 21 and the second shaping mold section 22 are connected to each other by a first connecting tube 26 and a second connecting tube 220. A shaping ring 212 is provided on the circumference of the shaping ring 212, and a plurality of guide protrusions 2121 supporting the inner wall of the mesh steel skeleton are provided. When the mesh steel skeleton passes through the guide protrusions 2121, the inner hole will be supported by the guide protrusions 2121, thereby avoiding deformation. The outer circumference of the first shaping mold segment 21 is also provided with at least one group of positioning keys 211, and each group of positioning keys 211 is evenly distributed on the outer circumference of the first shaping mold segment 21. Each positioning key 211 is provided with a positioning arc surface concentric with the forming inner mold, and each group of positioning keys 211 is adapted to the first shaping roller group 51. The number of the positioning keys 211 is the same as the number of the first shaping roller group 51, so the positioning keys 211 can be used as a positioning reference to facilitate the positioning of the center of the forming inner mold 2, and can also be used as the positioning of the first shaping roller group 51, so that the installation accuracy of the first shaping roller group 51 is higher.

[0046] The outer periphery of the upstream mold section 24 is provided with an inner molding flow channel 241 for facilitating the flow of materials. The inner molding channel is connected with the annular channel 37 between the outer molding mold of the molding outer mold 3 and the material ring 35, so as to facilitate the plastic fluid to enter the inner side of the mesh steel skeleton.

[0047] The upstream mold section 24 and the downstream mold section 25 are connected via an upstream connecting seat 27. A downstream connecting seat 28 is provided at the downstream end of the downstream mold section 25. A cooling cylinder 29 is provided between the downstream connecting seat 28 and the upstream connecting seat 27. A cooling channel 213 is formed between the outer periphery of the cooling cylinder 29 and the inner wall of the downstream mold section 25. A spirally arranged spiral blade is provided on the outer periphery of the cooling cylinder 29. A spiral cooling channel 213 is formed between the spiral blade and the inner wall of the downstream mold section 25. In this way, the cooling water flows in a spiral manner, and the cooling effect is better.

[0048] The inner molding die 2 is provided with an inlet pipe 210 and a return pipe 214. The downstream end of the inlet pipe 210 is installed on the upstream connection seat 27 or the downstream connection seat 28. Correspondingly, the downstream end of the return pipe 214 is installed on the downstream connection seat 28 or the upstream connection seat 27. The upstream connection seat 27 and the downstream connection seat 28 are provided with an upstream communication channel 221 and a downstream communication channel 215, respectively. The upstream communication channel 221 connects the cooling channel 213 with the inlet pipe 210 or the return pipe 214 installed on the upstream connection seat 27, and the downstream communication channel 215 connects the cooling channel 213 with the return pipe 214 or the inlet pipe 210 installed on the downstream connection seat 28. The inlet pipe 210 and the return pipe 214 can be installed in the above two ways, and both ways can be realized.

[0049] like Figure 8 As shown, a negative pressure vacuum tube is also fixed in the molding inner mold 2, a suction channel 217 is provided on the downstream connecting seat 28, and a plurality of suction holes 218 are provided on the outer periphery of the downstream end of the corresponding downstream mold section 25, and the downstream end of the negative pressure vacuum tube is connected with the suction holes 218 through the suction channel 217. In this embodiment, the negative pressure vacuum tube includes an upstream vacuum tube 216 and a downstream vacuum tube 219, and the downstream vacuum tube 219 is installed between the upstream connecting seat 27 and the downstream connecting seat 28.

[0050] like Figure 3 to Figure 4 As shown, the molding outer mold 3 includes a mold frame 31, and the mold frame 31 is fixedly connected to one end of a feed mold barrel 32. The feed mold barrel 32 is provided with a feed channel that is connected to the discharge port of the extruder. The other end of the feed mold barrel 32 is fixed with an outer molding core mold 34 with a center hole. The feed mold barrel 32 is detachably mounted with a material ring adjustment seat 33, and a material ring 35 installation groove is provided on the material ring adjustment seat 33. The material ring 35 installation groove is provided with a material ring 35, and the material ring adjustment seat 33 is provided with a material ring adjustment mechanism 36. The material ring 35 is fixed, and an inclined annular channel 37 connected to the feed channel is arranged between the material ring 35 and the outer molding core mold 34. The end of the material ring adjustment seat 33 is detachably fixed with a die adjustment seat 311, and the die adjustment seat 311 is provided with a mounting through hole. An outer shaping ring 39 and a die 310 are respectively installed in the mounting through hole through a shaping adjustment mechanism 313 and a die adjustment mechanism 312. The inner hole of the outer shaping ring 39 is provided with discrete shaping teeth 391 that are in contact with the outer peripheral surface of the mesh steel skeleton for shaping.

[0051] Among them, the material ring adjustment mechanism 36 includes at least four first tightening bolts, and the material ring adjustment seat 33 is circumferentially evenly distributed with first radial screw holes adapted to the first tightening bolts. The first tightening bolts are installed one by one in the first radial screw holes, and the inner end of each first tightening bolt tightens the material ring 35.

[0052] In the present embodiment, the number of the first tightening bolts is preferably four, so that the material ring 35 can be adjusted in four directions, up, down, left, and right, which is convenient for adjustment.

[0053] In this embodiment, the die adjustment seat 311 is installed on the die mounting plate, a pad 315 is arranged between the die mounting plate and the material ring adjustment seat 33, and a partition plate 314 is arranged between the die mounting plate and the material ring.

[0054] Similarly, the structures of the shaping adjustment mechanism 313 and the die adjustment mechanism 312 are the same as the material ring adjustment mechanism 36, and respectively include a second tightening bolt and a third tightening bolt, and the second tightening bolt and the third tightening bolt are used to tighten the outer shaping ring 39 and the die 310 respectively, and the positions of the outer shaping ring 39 and the die 310 are adjusted by loosening or pushing the corresponding tightening bolts.

[0055] The downstream end of the die 310 is connected to a cooling device 4, which includes a cooling box, a partition plate 42 is provided in the cooling box, and the partition plate 42 divides the cooling box into a cooling chamber 41 and an overflow chamber 43, and an overflow port 44 is provided on the partition plate 42. The upstream side wall, downstream side wall and partition plate 42 of the cooling box are all provided with through holes for convenient penetration of the composite pipe. The formed composite pipe passes through the cooling chamber 41 and the overflow chamber 43 in turn and passes through the through holes. The composite pipe is cooled at the first time, and the molding quality of the composite pipe is better. A cold ring 46 is fixed on the outer side of the upstream side wall of the cooling box, and the inner hole of the cold ring 46 is adapted to the outer diameter of the composite pipe. A ring-shaped spray pipe 45 is provided on the inner side of the upstream side wall to spray the cold ring 46. The spray pipe 45 is connected to the water inlet pipe 210, and the overflow chamber 43 is connected to the drain pipe. The end face of the cold ring 46 close to the die 310 is provided with an annular groove, and the corresponding end of the die 310 is provided with an annular protrusion, which is inserted into the annular groove for positioning and fitting, and the annular protrusion and the annular groove are not in contact, and a heat-insulating polytetrafluoroethylene ring 316 is provided between the cold ring 46 and the die 310, and the cooling box is fixed to the die adjustment seat 311 or the die 310 mounting plate 38.

[0056] The above-described embodiments are merely descriptions of preferred implementations of the present invention and are not intended to limit the scope of the present invention. Various modifications and alterations to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the scope of protection defined by the claims of the present invention.

Claims

1. A forming device for a mesh steel skeleton reinforced composite pipe, comprising a machine base and a forming inner mold and a forming outer mold arranged on the machine base, wherein the forming outer mold is concentrically sleeved on the outer periphery of the forming inner mold, and a forming channel is formed between the forming inner mold and the forming outer mold for facilitating the passing of the mesh steel skeleton and the passing of the plastic fluid, characterized in that: The inner forming mold is provided with a shaping section, and correspondingly, a positioning shaping mechanism for positioning and shaping the mesh steel skeleton is also provided at a position corresponding to the shaping section on the machine base; the inner forming mold is provided with the shaping section, an upstream mold section and a downstream mold section in sequence, the shaping section is connected to the upstream end of the upstream mold section, a shaping structure is provided on the periphery of the shaping section, an inner forming flow channel is provided on the periphery of the upstream mold section for facilitating the flow of materials, the upstream mold section and the downstream mold section are connected via an upstream connecting seat, and a downstream connecting seat is provided at the downstream end of the downstream mold section A cooling cylinder is arranged between the downstream connecting seat and the upstream connecting seat, and a cooling channel is formed between the outer periphery of the cooling cylinder and the inner wall of the downstream mold section. A water inlet pipe and a water return pipe are installed in the molding inner mold, and the downstream end of the water inlet pipe is installed on the upstream connecting seat or the downstream connecting seat, and correspondingly, the downstream end of the water return pipe is installed on the downstream connecting seat or the upstream connecting seat, and the upstream connecting seat and the downstream connecting seat are respectively provided with an upstream connecting channel and a downstream connecting channel, and the upstream connecting channel connects the cooling channel with the water inlet pipe or the water return pipe installed on the upstream connecting seat, The downstream connecting channel connects the cooling channel with the return pipe or the water inlet pipe installed on the downstream connecting seat; a negative pressure vacuum tube is also fixed in the inner molding die, and a suction channel is arranged on the downstream connecting seat, and a plurality of suction holes are arranged on the outer periphery of the downstream end of the corresponding downstream mold section, and the downstream end of the negative pressure vacuum tube is connected with the suction hole through the suction channel; a spiral blade is arranged on the outer periphery of the cooling cylinder, and a spiral cooling channel is formed between the spiral blade and the inner wall of the downstream mold section; the shaping section includes a first shaping mold section, a second shaping mold section and a third shaping mold section. The mold segment, the first shaping mold segment and the second shaping mold segment are connected by a first connecting tube, the second shaping mold segment and the third shaping mold segment are connected by a second connecting tube, shaping rings are arranged on the outside of the first connecting tube and the second connecting tube, and a plurality of guide protrusions supporting the inner wall of the mesh steel skeleton are arranged on the circumference of the shaping ring, and at least one group of positioning keys are also arranged on the outer periphery of the first shaping mold segment, and each group of positioning keys are evenly distributed on the outer periphery of the first shaping mold segment, and each positioning key is provided with a positioning arc surface concentric with the forming inner mold, and each group of positioning keys is adapted to the first shaping roller group.

2. A forming device for a mesh steel skeleton reinforced composite pipe according to claim 1, characterized in that: The positioning and shaping mechanism includes at least one set of first shaping roller groups and at least one set of second shaping roller groups, the first shaping roller group includes a first upper shaping roller and a first lower shaping roller arranged up and down, the second shaping roller group includes a first left shaping roller and a first right shaping roller arranged left and right, the first upper shaping roller and the first lower shaping roller cooperate with each other to shape the mesh steel skeleton from the up and down directions, the first left shaping roller and the first right shaping roller cooperate with each other to shape the mesh steel skeleton from the left and right directions.

3. A forming device for a mesh steel skeleton reinforced composite pipe according to claim 2, characterized in that: The molding outer mold includes a mold frame, which is fixedly connected to one end of a feed mold barrel, a feed channel which is connected to the discharge port of the extruder is provided on the feed mold barrel, an outer molding core mold with a center hole is fixed to the other end of the feed mold barrel, a material ring adjustment seat is detachably mounted on the feed mold barrel, a material ring mounting groove is provided on the material ring adjustment seat, a material ring is arranged in the material ring mounting groove, the material ring is fixed to the material ring adjustment seat by a material ring adjustment mechanism, an inclined annular channel connected to the feed channel is provided between the material ring and the outer molding core mold, a mouth mold adjustment seat is detachably fixed on the end of the material ring adjustment seat, a mounting through hole is provided on the mouth mold adjustment seat, an outer molding ring and a mouth mold are respectively mounted in the mounting through hole by a shaping adjustment mechanism and a mouth mold adjustment mechanism, and the inner hole of the outer molding ring is provided with discrete shaping teeth which are contacted and shaped with the outer peripheral surface of the mesh steel skeleton.

4. A forming device for a mesh steel skeleton reinforced composite pipe as claimed in claim 3, characterized in that: The material ring adjustment mechanism includes at least four first tightening bolts, and the material ring adjustment seat is circumferentially evenly distributed with first radial screw holes adapted to the first tightening bolts. The first tightening bolts are installed in the first radial screw holes one by one, and the inner end of each first tightening bolt tightens the material ring.

5. A forming device for a mesh steel skeleton reinforced composite pipe as claimed in claim 4, characterized in that: The downstream end of the die is connected to a cooling device, which includes a cooling box body, a partition plate is provided in the cooling box body, the partition plate divides the cooling box body into a cooling chamber and an overflow chamber, an overflow port is provided on the partition plate, and through holes for convenient penetration of the composite pipe are provided on the upstream side wall, the downstream side wall and the partition plate of the cooling box body, a cold ring is fixed on the outer side of the upstream side wall of the cooling box body, the inner hole of the cold ring is adapted to the outer diameter of the composite pipe, an annular spray pipe for spraying toward the cold ring is provided on the inner side of the upstream side wall, the spray pipe is connected to the water inlet pipe, and the overflow chamber is connected to the drain pipe.

6. A forming device for a mesh steel skeleton reinforced composite pipe as claimed in claim 5, characterized in that: The end face of the cold ring close to the die is provided with an annular groove, and the corresponding end of the die is provided with an annular protrusion, which is inserted into the annular groove for positioning and fitting, and the annular protrusion and the annular groove are not in contact, and a heat-insulating polytetrafluoroethylene ring is provided between the cold ring and the die, and the cooling box is fixed to the die adjustment seat or the die mounting plate.

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