CN213441150U

CN213441150U - PVC-O tubular product bellmouth inflation shaping mandrel

Info

Publication number: CN213441150U
Application number: CN202022072522.6U
Authority: CN
Inventors: 孙建凯; 郑书华; 顾建国; 霍志晴; 赵朋飞; 侯培培
Original assignee: Hebei Wanlitai Olive Pipe Industry Co ltd
Current assignee: Hebei Wanlitai Olive Pipe Industry Co ltd
Priority date: 2020-09-21
Filing date: 2020-09-21
Publication date: 2021-06-15
Anticipated expiration: 2030-09-21

Abstract

The utility model discloses a PVC-O tubular product bellmouth inflation shaping mandrel, including inside hollow plug, set up a plurality of holes rather than the inner chamber intercommunication on the outer disc wall of plug. The utility model discloses a set up a plurality of holes rather than the inner chamber intercommunication on the outer disc wall of plug, adsorb PVC-O tubular product through the hole negative pressure for the outer wall of plug is hugged closely to the tubular product inner wall of heating, prevents that PVC-O tubular product is at the in-process of heating along the axial and contracts back, has realized the orientation characteristic at PVC-O tubular product bellmouth position, has improved intensity, toughness, shock resistance at bellmouth position.

Description

PVC-O tubular product bellmouth inflation shaping mandrel

Technical Field

The utility model relates to a PVC-O tubular product production facility field especially relates to a PVC-O tubular product bellmouth inflation shaping mandrel.

Background

The PVC-O pipe is an oriented pipe obtained by heating a PVC-U pipe to a high elastic state and performing biaxial tension, and has the characteristics of high strength, high toughness, impact resistance and the like. The forming process of the socket of the traditional PVC-O pipe which is widely used at present comprises the following steps: one end of the pipe is heated and then inserted into a flaring die, a built-in forming slide block is opened under the action of force, the softened pipe wall is supported by mechanical force, and then the pipe is cooled and shaped. The process has the following disadvantages: in the forming process of the socket of the PVC-O pipe, high-temperature heating is needed, the original shaped molecular biaxial orientation structure retracts under the heating state, the orientation characteristic is lost, the strength, the toughness and the impact resistance of the socket part of the PVC-O pipe are greatly reduced, the standard technical requirements of the PVC-O pipe cannot be met, and the potential safety hazard of water delivery exists.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a PVC-O tubular product bellmouth inflation shaping mandrel, solve the PVC-O tubular product bellmouth processing shaping back among the background art, the problem that intensity, toughness, impact resistance reduce by a wide margin.

In order to solve the technical problem, the utility model adopts the following technical scheme:

the utility model relates to a PVC-O tubular product bellmouth inflation shaping mandrel, including inside hollow plug, set up a plurality of holes rather than the inner chamber intercommunication on the outer disc wall of plug.

Furthermore, the rear end of the mandrel is provided with an opening and an end cover, and the middle part of the end cover is provided with a hollow shaft communicated with the inner cavity of the mandrel.

Further, an electric heating device is arranged in the hollow inner cavity of the core rod.

Further, the electric heating device adopts a cast aluminum electric heating cylinder.

Furthermore, the front end integrated into one piece of plug has the round platform, the cover is equipped with the sealing washer on the round platform, the preceding terminal surface of round platform is provided with detachable plug top, the rear end face of plug top supports on the sealing washer.

Furthermore, a mandrel top is integrally formed at the front end of the mandrel, an annular groove is formed between the mandrel top and the mandrel, and a sealing ring is sleeved in the annular groove.

Furthermore, the front end of the mandrel top is a conical surface.

Compared with the prior art, the utility model discloses a beneficial technological effect:

the utility model discloses set up a plurality of holes rather than the inner chamber intercommunication on the outer disc wall of plug, adsorb PVC-O tubular product through the hole negative pressure for the outer wall of plug is hugged closely to the tubular product inner wall of heating, prevents that PVC-O tubular product is at the in-process of heating along the axial and contracts, has realized the orientation characteristic at PVC-O tubular product bellmouth position, has improved intensity, toughness, shock resistance at bellmouth position.

Drawings

The present invention will be further explained with reference to the following description of the drawings.

Fig. 1 is a cross-sectional view of a mandrel according to an embodiment of the present invention;

fig. 2 is a schematic view illustrating installation and use of a core rod according to a first embodiment of the present invention;

fig. 3 is a schematic structural view of a bellmouth formed by inflation in the first embodiment of the present invention;

fig. 4 is a structural sectional view of a mandrel according to a second embodiment of the present invention.

Description of reference numerals: 1. a cavity; 101. an upper cavity; 102. a lower cavity; 2. a cavity frame; 3. heating furnace; 4. a core rod; 401. a pore; 402. an electric heating device; 403. an end cap; 404. a circular truncated cone; 405. a seal ring; 406. a mandrel top; 407. an annular groove; 5. a hollow shaft; 6. PVC-O pipe material; 601. a socket; 7. a hydraulic cylinder; 8. an equipment rack body; 9. a power transmission shaft; 901. a shaft sleeve; 10. a rotary joint; 11. a pressure main pipeline; 12. a first branch pipe; 1201. a negative pressure device; 1202. a first valve; 13. a second branch pipe; 1301. a high pressure device; 1302. a second valve; 14. a box body; 15. a drive motor; 16. a slide rail assembly.

Detailed Description

In order to make the technical solution of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the accompanying drawings and the detailed description.

Example one

As shown in fig. 1, the present embodiment discloses a PVC-O pipe bellmouth blow molding mandrel, which includes a hollow mandrel 4, and a plurality of pores 401 communicating with an inner cavity of the mandrel 4 are disposed on an outer circumferential wall of the mandrel 4. The rear end of the core rod 4 is opened and connected with an end cover 403 through a bolt, the end cover 403 and the core rod 4 are sealed through a gasket, and the middle part of the end cover 403 is provided with a hollow shaft 5 communicated with the inner cavity of the core rod 4. An electric heating device 402 is arranged in the hollow inner cavity of the core rod 4. The electric heating device 402 employs a cast aluminum electric heating cartridge.

In this embodiment, the front end of the hollow shaft 5 extends to the front part of the mandrel 4 and is connected with the mandrel 4 in a sealing manner, and the circumferential wall of the front part of the hollow shaft 5 is provided with a through hole communicated with the inner cavity of the mandrel 4.

In this embodiment, a mandrel top 406 is integrally formed at the front end of the mandrel 4, the front end of the mandrel top 406 is a tapered surface to facilitate insertion into a PVC-O pipe, an annular groove 407 is provided between the mandrel top 406 and the mandrel 4, and a sealing ring 405 is sleeved in the annular groove 407.

As shown in figure 2, the core rod 4 is required to be arranged on PVC-O pipe socket inflation forming equipment in the using process, and the equipment mainly comprises a cavity 1, a cavity frame 2 and a heating furnace 3. The cavity 1, the heating furnace 3 and the core rod 4 are coaxially arranged in sequence.

The cavity 1 includes an upper cavity 101 and a lower cavity 102. The upper cavity 101 and the lower cavity 102 are located in the cavity frame 2 and are arranged oppositely, the upper cavity 101 and the lower cavity 102 are both connected with the driving end of a corresponding hydraulic cylinder 7 installed on the cavity frame 2, and the upper cavity 101 and the lower cavity 102 are driven by the hydraulic cylinder 7 to move. The cavity frame 2 is square, and the cavity frame 2 is installed on the equipment support body 8 below through a bolt assembly. The furnace 3 is also mounted on the equipment frame 8.

The rear end of the hollow shaft 5 is connected to a hollow power transmission shaft 9 through a bolt, the rear end of the power transmission shaft 9 is communicated with a main pressure pipe 11 through a rotary joint 10, and the main pressure pipe 11 is communicated with a negative pressure device 1201 and a high pressure device 1301 through a first branch pipe 12 and a second branch pipe 13 respectively. The first branch pipe 12 is provided with a first valve 1202 and the second branch pipe 13 is provided with a second valve 1302. In this embodiment, the negative pressure device 1201 is a vacuum pump, and the high pressure device 1301 is a high pressure air tank, which is supplied with high pressure air by an air compression pump.

The power transmission shaft 9 is rotatably connected with a shaft sleeve 901 on the outer side through a bearing, the shaft sleeve 901 is installed in the box body 14 through a bolt, a belt pulley is arranged at the rear part of the power transmission shaft 9 and is in power connection with a driving motor 15 through a belt, the driving motor 15 is installed at the bottom of the box body 14, the box body 14 is installed on a sliding block of a sliding rail assembly 16, and a sliding rail of the sliding rail assembly 16 is connected with an equipment frame body 8 in front. The box 14 can be driven by a hydraulic cylinder, the telescopic end of the hydraulic cylinder is hinged to the bottom of the box 14, and the body of the hydraulic cylinder is hinged to a fixed base.

In combination with the bell mouth forming equipment, the embodiment also discloses a fluid inflation type bell mouth forming process for the PVC-O pipe, which comprises five steps of inserting the core rod and the pipe, heating the pipe and adsorbing the pipe under negative pressure, locking and closing the cavity, blowing and forming the high-pressure fluid, and separating the core rod from the pipe.

And step S1, inserting the core rod and the pipe, conveying the preheated PVC-O pipe 6 to a set position through a roller, clamping and fixing the PVC-O pipe 6 by a hydraulic clamping device, and driving the box body 14 to move forwards through the sliding rail assembly 16 under the driving of a hydraulic cylinder to drive the core rod 4 to be inserted into the preformed end part of the PVC-O pipe 6.

Step S2, heating the pipe and absorbing under negative pressure: the hydraulic clamping device for fixing the PVC-O pipe 6 is opened, the PVC-O pipe 6 is driven by the core rod 4 to retreat into the heating furnace 3, and the end part of the PVC-O pipe 6 is heated by the heating furnace 3 and the electric heating device 402 arranged in the core rod 4. In order to uniformly heat the preformed end part of the PVC-O pipe 6, the driving motor 15 can drive the power transmission shaft 9 to rotate, and then the hollow shaft 5 and the core rod 4 drive the PVC-O pipe 6 to rotate and be uniformly heated.

When the PVC-O pipe 6 rotates to be uniformly heated, the negative pressure device 1201 is started, the first valve 1202 is opened, the negative pressure device 1201 sequentially passes through the first branch pipe 12, the main pressure pipe 11, the rotary joint 10, the hollow power transmission shaft 9 and the hollow shaft 5, so that the inner cavity of the core rod 4 is in a negative pressure state, the PVC-O pipe 6 is tightly attached to the outer wall of the core rod 4 through the hole 401 in the core rod 4, and the PVC-O pipe 6 is prevented from axially retracting in the heating process. In the process, the sealing ring 405 ensures the sealing performance of the negative pressure adsorption of the core rod 4 and the PVC-O pipe 6.

Step S3, locking and closing the cavity: after the PVC-O pipe 6 is heated to a specific temperature, the PVC-O pipe 6 enters a forming cavity under the pushing of the core rod 4, and the hydraulic cylinder 7 drives the upper cavity 101 and the lower cavity 102 to move oppositely to clamp the preformed end part of the PVC-O pipe 6.

Step S4, high-pressure fluid blowing molding: injecting high-pressure fluid into the inner cavity of the core rod 4, enabling the end part of the preformed PVC-O pipe 6 to deform and expand under the pressure action of the fluid flowing out of the pore 401 on the core rod 4, enabling the end part of the PVC-O pipe 6 to be tightly attached to the cavity of the cavity 1 after expanding so as to complete preforming according to a mold formed by the cavity 1, maintaining the pressure of the core rod 4 for a certain time, and cooling and shaping the end part of the PVC-O pipe 6.

Specifically, the negative pressure device 1201 and the first valve 1202 are closed, the high pressure device 1301 and the second valve 1302 are opened, the high pressure device 1301 sequentially passes through the second valve 1302, the pressure main pipe 11, the rotary joint 10, the hollow power transmission shaft 9 and the hollow shaft 5, so that the inner cavity of the mandrel 4 is in a high-pressure state, the preformed end of the PVC-O pipe 6 is deformed and expanded under the action of fluid pressure through the pore 401 on the mandrel 4, and the end of the PVC-O pipe 6 is tightly attached to the cavity walls of the upper cavity 101 and the lower cavity 102 after being expanded.

Step S5, separating the core rod from the pipe: and (3) closing the high-pressure device 1301, driving the upper cavity 101 and the lower cavity 102 to move in reverse directions by the hydraulic cylinder 7, opening the cavity 1, fastening and fixing the PVC-O pipe 6 by the hydraulic fastening device, withdrawing and separating the core rod 4 from the PVC-O pipe 6, loosening the hydraulic fastening device, and retreating the PVC-O pipe 6 away from the cavity 1 under the driving of the roller to complete the manufacture of the socket 601 of a single pipe.

As shown in fig. 3, the manufactured socket 601 needs to be trimmed on its front end.

Example two

As shown in fig. 4, in the present embodiment, a circular table 404 is integrally formed at the front end of the mandrel 4, a seal ring 405 is fitted over the circular table 404, a mandrel top 406 is detachably provided on the front end surface of the circular table 404, and the rear end surface of the mandrel top 406 abuts against the seal ring 405. Specifically, the mandrel ejector 406 and the circular truncated cone 404 are mounted, a cylindrical protrusion is integrally formed in the middle of the front end face of the circular truncated cone 404, the mandrel ejector 406 is sleeved on the cylindrical protrusion, and a nut used for pressing and fixing the mandrel ejector 406 is arranged at the outer end of the mandrel ejector 406. The nut is connected on the cylindrical bulge through threads. The hollow shaft 5 is sealingly connected to the end cap 403, and its front end does not extend to the front of the mandrel 4.

Except for the above structure, the installation and use of the mandrel 4 are the same as those of the first embodiment, and the description thereof is omitted.

The above-mentioned embodiments are only intended to describe the preferred embodiments of the present invention, but not to limit the scope of the present invention, and those skilled in the art should also be able to make various modifications and improvements to the technical solution of the present invention without departing from the spirit of the present invention, and all such modifications and improvements are intended to fall within the scope of the present invention as defined in the appended claims.

Claims

1. A PVC-O tubular product bellmouth inflation shaping mandrel which characterized in that: the hollow core rod comprises a hollow core rod (4), wherein a plurality of pores (401) communicated with the inner cavity of the hollow core rod are arranged on the outer circular wall of the hollow core rod (4).

2. The PVC-O pipe bellmouth inflation forming mandrel of claim 1, wherein: the rear end of the core rod (4) is opened and provided with an end cover (403), and the middle part of the end cover (403) is provided with a hollow shaft (5) communicated with the inner cavity of the core rod (4).

3. The PVC-O pipe bellmouth inflation forming mandrel of claim 1, wherein: an electric heating device (402) is arranged in the hollow inner cavity of the core rod (4).

4. The PVC-O pipe bellmouth inflation forming core mold as claimed in claim 3, characterized in that: the electric heating device (402) adopts a cast aluminum electric heating cylinder.

5. The PVC-O pipe bellmouth inflation forming mandrel of claim 1, wherein: the front end integrated into one piece of plug (4) has round platform (404), the cover is equipped with sealing washer (405) on round platform (404), the preceding terminal surface of round platform (404) is provided with detachable plug top (406), the rear end face of plug top (406) supports on sealing washer (405).

6. The PVC-O pipe bellmouth inflation forming mandrel of claim 1, wherein: the front end of the mandrel (4) is integrally formed with a mandrel top (406), an annular groove (407) is formed between the mandrel top (406) and the mandrel (4), and a sealing ring (405) is sleeved in the annular groove (407).

7. The PVC-O pipe bellmouth inflation forming core mold as claimed in claim 5 or 6, characterized in that: the front end of the core rod top head (406) is provided with a conical surface.