A PVC-O pipe socket inflation molding cavity

Abstract

The invention discloses a PVC-O pipe socket inflation molding cavity, comprising a mold block assembly, wherein the mold block assembly comprises a first mold block and a second mold block arranged facing each other, wherein the first mold block and the second mold block are both provided with a mold cavity adapted to the shape of the PVC-O pipe socket and a water trough for cooling and shaping the socket on the opposite surfaces thereof; the first mold block and the second mold block are both provided with a water inlet hole and a first drain hole connected to the water trough. The invention can complete inflation molding of the PVC-O pipe socket, as well as cooling and shaping after molding, and effectively improves the strength, toughness and impact resistance of the socket.

Description

Technical Field

[0001] The invention relates to the field of PVC-O pipe production equipment, in particular to a PVC-O pipe socket inflation molding cavity. Background Art

[0002] PVC-O pipe is an oriented pipe obtained by heating PVC-U pipe to a high elastic state and then biaxially stretching it. It has the characteristics of high strength, high toughness, and impact resistance. The traditional PVC-O pipe socket forming process widely used at present is: after heating one end of the pipe, it is inserted into the expansion mold, the built-in forming slider opens under the action of force, and the softened pipe wall is supported by mechanical force, and then cooled and formed. The disadvantages of this process are: during the forming process of the PVC-O pipe socket, high-temperature heating is required, and the original molecular biaxial orientation structure that has been finalized shrinks under the heating state and loses its orientation characteristics, which greatly reduces the strength, toughness, and impact resistance of the PVC-O pipe socket. It cannot meet the standard technical requirements of PVC-O pipes and there are hidden dangers in water supply safety. Based on this, a PVC-O pipe socket inflation molding cavity is designed. Summary of the invention

[0003] The purpose of the present invention is to provide a PVC-O pipe socket inflation molding cavity to solve the problem that the strength, toughness and impact resistance of the PVC-O pipe socket are greatly reduced after processing and molding in the background technology.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] The present invention discloses a PVC-O pipe socket inflation molding cavity, comprising a mold block assembly, wherein the mold block assembly comprises a first mold block and a second mold block arranged opposite to each other, and the first mold block and the second mold block are provided with a mold cavity adapted to the shape of the PVC-O pipe socket and a water trough for cooling and shaping the socket on the opposite surfaces thereof;

[0006] The first block and the second block are both provided with a water inlet hole and a first drain hole communicated with the water trough.

[0007] Furthermore, the water inlet hole and the first drainage hole are respectively located on two sides of the cavity.

[0008] Furthermore, the first mold block and the second mold block are both provided with a second drainage hole connected to the water channel, and the second drainage hole is located below the mold cavity.

[0009] Furthermore, the first drainage hole and the second drainage hole are both connected to the negative pressure water absorption device through pipelines, and the water inlet hole is connected to the water supply device through pipelines.

[0010] Furthermore, the water channel is arranged vertically to the cavity.

[0011] Compared with the prior art, the beneficial technical effects of the present invention are:

[0012] The present invention is used in conjunction with a core mold, and the preformed end of the PVC-O pipe is deformed and expanded by the action of fluid pressure through the pores on the core mold, and the end is closely fitted with the cavity wall of the cavity after expansion; after the socket is formed, water is supplied to the water inlet hole, and the water groove on the cavity is annularly wrapped on the PVC-O pipe, and the cooling water in the water groove cools and shapes the expanded end of the PVC-O pipe; the present invention can complete the inflation molding of the PVC-O pipe socket, as well as the cooling and shaping after molding, and effectively improves the strength, toughness and impact resistance of the socket. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The present invention will be further described below in conjunction with the accompanying drawings.

[0014] Figure 1 This is a schematic diagram of the structure of the medium block assembly in this embodiment;

[0015] Figure 2 This is a schematic diagram of the structure of the second type block in this embodiment.

[0016] Figure 3 is a cross-sectional view of the second block along the axial direction in this embodiment;

[0017] Figure 4 Schematic diagram of the top view of the second block in this embodiment;

[0018] Figure 5 This is a schematic diagram of the installation and use of the medium block assembly in this embodiment;

[0019] Figure 6 It is a schematic diagram of the bell mouth structure formed by inflation molding in this embodiment.

[0020] Explanation of the accompanying drawings: 1. block assembly; 101. first block; 102. second block; 103. cavity; 104. water inlet; 105. first drain hole; 106. water trough; 107. second drain hole; 2. cavity frame; 3. heating furnace; 4. core mold; 5. hollow shaft; 6. PVC-O pipe; 601. socket; 7. hydraulic cylinder; 8. equipment frame; 9. power transmission shaft; 901. bushing; 10. rotary joint; 11. pressure main pipeline; 12. first branch pipe; 1201. negative pressure device; 1202. first valve; 13. second branch pipe; 1301. high pressure device; 1302. second valve; 14. box; 15. drive motor; 16. slide rail assembly. DETAILED DESCRIPTION

[0021] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0022] like Figures 1 to 4 As shown, the present embodiment discloses a PVC-O pipe socket inflation molding cavity, including a block assembly 1, the block assembly 1 includes a first block 101 and a second block 102 arranged opposite to each other, and opposite surfaces of the first block 101 and the second block 102 are provided with a cavity 103 adapted to the shape of the PVC-O pipe socket, and a water trough 106 for cooling and shaping the socket. In the present embodiment, the water trough 106 is arranged vertically to the cavity 103.

[0023] A water inlet hole 104 and a first drainage hole 105 communicating with the water channel 106 are provided in the first mold block 101 and the second mold block 102. The water inlet hole 104 and the first drainage hole 105 are located on both sides of the mold cavity 103, respectively.

[0024] In order to drain the residual water at the bottom of the water trough 106 and facilitate the production of the next socket, a second drainage hole 107 connected to the water trough 106 is provided on the first mold block 101 and the second mold block 102. The second drainage hole 107 is located below the mold cavity 103.

[0025] When the block assembly 1 is in use, the first drainage hole 105 and the second drainage hole 107 are both connected to the negative pressure water absorption device through pipelines, and the water inlet hole 104 is connected to the water supply device through pipelines.

[0026] like Figure 5 As shown, the mold block assembly 1 needs to be installed on the PVC-O pipe socket inflation molding equipment during use, and the equipment mainly includes a cavity frame 2, a heating furnace 3, and a core mold 4. The mold block assembly 1, the heating furnace 3, and the core mold 4 are arranged coaxially in sequence.

[0027] The first mold block 101 and the second mold block 102 are both connected to the driving end of the corresponding hydraulic cylinder 7 installed on the cavity frame 2, and the first mold block 101 and the second mold block 102 are driven by the hydraulic cylinder 7. The cavity frame 2 is in a square shape, and the cavity frame 2 is installed on the equipment frame 8 below by a bolt assembly.

[0028] The core mold 4 is a hollow structure, and a plurality of pores connected to its inner cavity are arranged on the circumferential wall of the core mold 4. An electric heating sleeve is also arranged in the inner cavity of the core mold 4. The core mold 4 is installed at the front end of the hollow shaft 5. The front end of the hollow shaft 5 is provided with a through hole connected to the inner cavity of the core mold 4. The rear end of the hollow shaft 5 is connected to the hollow power transmission shaft 9 by bolts. The rear end of the power transmission shaft 9 is connected to the pressure main pipeline 11 through a rotary joint 10. The pressure main pipeline 11 is connected to the negative pressure device 1201 and the high pressure device 1301 through the first branch pipe 12 and the second branch pipe 13 respectively. A first valve 1202 is arranged on the first branch pipe 12, and a second valve 1302 is arranged on the second branch pipe 13. In this embodiment, the negative pressure device 1201 adopts a vacuum pump, and the high pressure device 1301 adopts a high pressure gas storage tank, and the high pressure gas storage tank is provided with high pressure gas by an air compression pump.

[0029] The power transmission shaft 9 is rotatably connected to the outer sleeve 901 through a bearing, and the sleeve 901 is installed in the box body 14 through bolts. A pulley is provided at the rear of the power transmission shaft 9, and the pulley is connected to the driving motor 15 through a belt. The driving motor 15 is installed at the bottom of the box body 14, and the box body 14 is installed on the slider of the slide rail assembly 16. The slide rail of the slide rail assembly 16 is connected to the front equipment frame 8. The box body 14 can be driven by a hydraulic cylinder, and the telescopic end of the hydraulic cylinder is hinged at the bottom of the box body 14, and the hydraulic cylinder body is hinged on a fixed base.

[0030] In combination with the above-mentioned socket forming equipment, this embodiment also discloses a PVC-O pipe fluid inflation socket forming process, including five steps: plugging the core mold and the pipe, heating the pipe and negative pressure adsorption, locking and closing the cavity, high-pressure fluid inflation molding, and separating the core mold and the pipe.

[0031] Step S1, the core mold is inserted into the pipe, and the preheated PVC-O pipe 6 is conveyed to the set position via rollers. The PVC-O pipe 6 is clamped and fixed by the hydraulic clamping device. Under the drive of the hydraulic cylinder, the box 14 moves forward through the slide rail assembly 16, driving the core mold 4 to be inserted into the preformed end of the PVC-O pipe 6.

[0032] Step S2, pipe heating and negative pressure adsorption: the hydraulic clamping device for fixing the PVC-O pipe 6 is opened, and the PVC-O pipe 6 is driven by the core mold 4 to retreat into the heating furnace 3, and the end of the PVC-O pipe 6 is heated by the heating furnace 3 and the electric heating sleeve arranged in the core mold 4. In order to make the preformed end of the PVC-O pipe 6 heated evenly, the power transmission shaft 9 can be driven to rotate by the driving motor 15, and then the PVC-O pipe 6 is driven to rotate through the hollow shaft 5 and the core mold 4 to be evenly heated.

[0033] While the PVC-O pipe 6 rotates and is heated evenly, the negative pressure device 1201 is started and the first valve 1202 is opened. The negative pressure device 1201 passes through the first branch pipe 12, the pressure main pipe 11, the rotary joint 10, the hollow power transmission shaft 9, and the hollow shaft 5 in sequence, so that the inner cavity of the core mold 4 is in a negative pressure state, and then the PVC-O pipe 6 is closely attached to the outer wall of the core mold 4 through the pores on the core mold 4, preventing the PVC-O pipe 6 from axially shrinking during the heating process.

[0034] 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 the molding cavity position under the push of the core mold 4, and the hydraulic cylinder 7 drives the first mold block 101 and the second mold block 102 to move toward each other to clamp the preformed end of the PVC-O pipe 6.

[0035] Step S4, high-pressure fluid inflation molding: high-pressure fluid is injected into the inner cavity of the core mold 4, and the preformed end of the PVC-O pipe 6 is deformed and expanded under the pressure of the fluid flowing out of the pores on the core mold 4. After the end of the PVC-O pipe 6 expands, it is tightly fitted with the cavity of the upper and lower cavities 103 to complete the preforming according to the mold formed by the upper and lower cavities 103. After the core mold 4 maintains pressure for a certain period of time, the end of the PVC-O pipe 6 is cooled and shaped.

[0036] Specifically, the negative pressure device 1201 and the first valve 1202 are closed, and 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 pipeline 11, the rotary joint 10, the hollow power transmission shaft 9, and the hollow shaft 5, so that the inner cavity of the core mold 4 is in a high pressure state, and the preformed end of the PVC-O pipe 6 is deformed and expanded by the fluid pressure through the pores on the core mold 4. After the end of the PVC-O pipe 6 expands, it fits tightly with the cavity walls of the upper and lower cavities 103.

[0037] After the core mold 4 is kept under pressure for a certain period of time, water is supplied to the water inlet 104, and the cooling water enters the first drainage hole 105 and the second drainage hole 107 through the water groove 106, and is finally discharged by the negative pressure water absorption device. The water groove 106 on the upper and lower cavities 103 is annularly wrapped around the PVC-O pipe 6, and the cooling water in the water groove 106 cools and shapes the end of the PVC-O pipe 6 after expansion.

[0038] Step S5, separation of the core mold and the pipe: close the high-pressure device 1301, and at the same time, the hydraulic cylinder 7 drives the first mold block 101 and the second mold block 102 to move in the opposite direction, so that the upper and lower mold cavities 103 are opened, and the hydraulic clamping device tightens and fixes the PVC-O pipe 6, so that the core mold 4 withdraws and separates from the PVC-O pipe 6, and the hydraulic clamping device is released, and the PVC-O pipe 6 retreats and leaves the mold cavity 103 under the drive of the roller, completing the production of the socket 601 of a single pipe.

[0039] like Figure 6 As shown, after the socket 601 is manufactured, its front end needs to be trimmed.

[0040] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A PVC-O pipe socket inflation molding cavity, characterized in that: The mold block assembly (1) comprises a first mold block (101) and a second mold block (102) arranged opposite to each other, and a mold cavity (103) adapted to the shape of a PVC-O pipe socket and a water trough (106) for cooling and shaping the socket are arranged on the opposite surfaces of the first mold block (101) and the second mold block (102); The first block (101) and the second block (102) are both provided with a water inlet hole (104) and a first drainage hole (105) which are in communication with the water channel (106); The water-passing grooves (106) are multiple in number and are sequentially spaced apart along the axial direction of the mold cavity (103), and each of the water-passing grooves (106) is in communication with the mold cavity (103); After the socket is formed, water is supplied to the water inlet hole (104), and the water groove (106) on the cavity (103) is annularly wrapped around the PVC-O pipe. The cooling water in the water groove (106) cools and shapes the end of the PVC-O pipe after expansion.

2. The PVC-O pipe bellmouth inflation molding cavity according to claim 1, characterized in that: The water inlet hole (104) and the first drainage hole (105) are respectively located on two sides of the cavity (103).

3. The PVC-O pipe bellmouth inflation molding cavity according to claim 2, characterized in that: The first mold block (101) and the second mold block (102) are both provided with a second drainage hole (107) connected to the water channel (106), and the second drainage hole (107) is located below the mold cavity (103).

4. The PVC-O pipe bellmouth inflation molding cavity according to claim 3, characterized in that: The first drainage hole (105) and the second drainage hole (107) are both connected to the negative pressure water absorption device through pipelines, and the water inlet hole (104) is connected to the water supply device through pipelines.

5. The PVC-O pipe socket inflation molding cavity according to claim 1, characterized in that: The water channel (106) is arranged vertically to the mold cavity (103).

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