Extrusion, shaping and spraying system for HDPE (High-Density Polyethylene)

Abstract

The utility model discloses an extruding, shaping and spraying system for an HDPE (High-Density Polyethylene) mute drain pipe. The technical problem that the spraying range of an existing extrusion shaping spraying system cannot completely and evenly cover the surface of a pipe, and the pipe cooling effect is affected is solved. The two main water pipes are arranged in the spraying box in the length direction of the spraying box body, the annular pipes are perpendicular to the main water pipes and are correspondingly communicated between the two main water pipes in an equal-interval array mode, and the spraying heads are arranged in an equal-interval array mode and communicated to pipe bodies of the annular pipes. The spraying head comprises a spraying cavity and a spraying cap, the spraying cavity is used for being communicated with the annular pipe, the spraying cap is in threaded connection with the corresponding end of the spraying cavity, a plurality of spraying holes are formed in the spraying cap, and the spraying holes are arranged in a rectangular outline corresponding array mode. According to the spraying system, the spraying area and range can be flexibly adjusted according to actual requirements, the spraying uniformity is high, all areas of the pipe can be sprayed in a full-coverage mode, and the cooling and shaping effect is good.

Description

Technical Field

[0001] The present application relates to the technical field of pipe extrusion equipment, and specifically to a spray cooling and shaping system for HDPE silent drainage pipes. Background Art

[0002] Spray cooling and shaping of pipes is a key step in the pipe extrusion and forming process. Its main purpose is to quickly cool and shape the pipes by spraying cooling water after the pipes are extruded, so as to achieve the required dimensional accuracy and surface quality. Among them, the principle of spray cooling is to use the high specific heat capacity and fluidity of water to quickly take away the heat on the pipe surface, thereby reducing the pipe temperature and making it reach a stable state in a short time.

[0003] When pipes are produced, first, the molten plastic material is extruded into a tubular shape by an extruder. The extruder heats, plasticizes, and extrudes the plastic material into a shape through the rotation and propulsion of the screw. The extruded pipes first pass through a sizing sleeve for preliminary cooling and shaping. Cooling water is passed through the inside of the sizing sleeve, and by means of contact cooling, the outer diameter of the pipes is fixed and the temperature of the pipes is initially reduced. The pipes that have undergone preliminary cooling enter the spray cooling area. The spray device evenly sprays water mist on the pipe surface through nozzles, forming a thin water film. This water film quickly absorbs the heat on the pipe surface and evaporates, thereby taking away a large amount of heat, further cooling and shaping the pipes. The cooled pipes are pulled out at a constant speed by a traction device and cut as required. The traction speed needs to match the extrusion speed to ensure uniform wall thickness of the pipes. The cutting machine precisely cuts the pipes according to the set length requirements.

[0004] However, in the process of implementing the technical solutions in the embodiments of the present application, the inventors of the present application found that the spray system of the existing extruder has at least the following technical problems: The spray area of the existing spray system is only arranged along the length direction of the spray box, resulting in insufficient cooling of the top and bottom of the pipes, and the spray range is affected by the water pressure, and the cooling effect of the pipes cannot be guaranteed.

[0005] The information disclosed in this background art section is only used to deepen the understanding of the background art of the present disclosure, and should not be regarded as an admission or any form of suggestion that this information constitutes the prior art known to those skilled in the art. Summary of the Invention

[0006] In view of at least one of the above technical problems, the present disclosure provides a spray cooling and shaping system for HDPE silent drainage pipes, aiming to solve the technical problem that the spray range of the existing spray cooling and shaping system cannot completely and evenly cover the pipe surface, which affects the cooling effect of the pipes.

[0007] According to one aspect of the present disclosure, there is provided an HDPE silent drain pipe extrusion and shaping spray system, which includes two main water pipes arranged along the length direction of the spray box in the spray box, a plurality of annular pipes vertically and equally spaced in an array and communicating between the two main water pipes, and a plurality of spray heads equally spaced in an array and communicating with the pipe body of the annular pipe; the spray head includes a spray cavity for communicating with the annular pipe, and a spray cap threadedly connected to the corresponding end of the spray cavity and provided with a plurality of spray holes, and each of the spray holes is arranged in a rectangular contour corresponding to an array.

[0008] In some embodiments of the present disclosure, the annular pipe includes two semi-annular branch pipes, and the two semi-annular branch pipes are correspondingly communicated with the main water pipe through a four-way valve.

[0009] In some embodiments of the present disclosure, the valve body includes interfaces respectively used for correspondingly communicating with the two semi-annular branch pipes and the main water pipe, and the adjacent interfaces are correspondingly vertically arranged.

[0010] In some embodiments of the present disclosure, the four-way valve further includes a valve core embedded in the valve body, and the valve core includes a first flow channel and a second flow channel respectively used for correspondingly conducting the interfaces and perpendicular to each other, and a third flow channel arranged along the symmetric midline corresponding to the first flow channel and the second flow channel.

[0011] In some embodiments of the present disclosure, a knob for controlling the rotation of the valve core is provided on the corresponding end face of the valve body.

[0012] In some embodiments of the present disclosure, a spring with an axis corresponding to and coinciding with the axis of the spray cavity is provided in the spray cavity, a spindle-shaped adjusting core is provided between the spring and the spray cap, and a reduced diameter portion is provided on the inner edge of the corresponding end of the valve body along the water outflow direction on the side of the spray cap.

[0013] In some embodiments of the present disclosure, the taper of the reduced diameter portion is smaller than the taper of the conical surface on the side of the adjusting core corresponding to the spray cap.

[0014] In some embodiments of the present disclosure, a water inlet is provided in the middle of the corresponding end of the spray cavity, and an annular shoulder for limiting the spring is provided on the inner wall of the spray cavity at the position corresponding to the water inlet.

[0015] In some embodiments of the present disclosure, a positioning post for abutting against the spray cap is provided at the corresponding end of the adjusting core, and a positioning groove matching the positioning post is provided on the corresponding end face of the spray cap.

[0016] One or more technical solutions provided in the embodiments of the present application have at least any one of the following technical effects or advantages:

[0017] 1. The circumferential spraying around the pipe can be achieved through each annular pipe arranged perpendicular to the main water pipe, ensuring that the surface of the pipe can be evenly and effectively sprayed, and thus guaranteeing the cooling and shaping effect of the pipe.

[0018] 2. The four-way valve can adjust the on-off of the corresponding main water pipe and / or annular pipe as needed, so that the faulty section can be disconnected from the water supply pipeline without affecting the water supply of other sections, improving the flexibility of water supply and the convenience of maintenance.

[0019] 3. The spray head realizes the spraying of a rectangular area through a number of spray holes arranged in a rectangular contour array. Thus, the spray boundaries of each spray head can correspond and coincide, ensuring that the entire pipe can be sprayed and cooled, and at the same time avoiding the problem that the spray areas overlap, affecting the spray uniformity and the cooling and shaping effect.

[0020] 4. The adjustment core can be used to adjust the spraying range of the spray head, so as to adjust the corresponding spray area of each spray head according to actual working conditions such as water pressure and cooling requirements, improving the working flexibility of the spraying system. Description of the Drawings

[0021] Figure 1 It is a partial structural schematic diagram of the spraying system in an embodiment of the present application.

[0022] Figure 2 It is an overall structural schematic diagram of the four-way valve in an embodiment of the present application.

[0023] Figure 3 It is a structural schematic diagram of the four-way valve spool in an embodiment of the present application.

[0024] Figure 4 It is a sectional view schematic diagram of all interfaces of the four-way valve being conducted in an embodiment of the present application.

[0025] Figure 5 It is a sectional view schematic diagram of some interfaces of the four-way valve being conducted in an embodiment of the present application.

[0026] Figure 6 It is another sectional view schematic diagram of some interfaces of the four-way valve being conducted in an embodiment of the present application.

[0027] Figure 7 It is a structural schematic diagram of the spray head in an embodiment of the present application.

[0028] Figure 8 It is a sectional view schematic diagram of the spray head in an embodiment of the present application.

[0029] In the above figures, 1 is the main water pipe, 2 is the semi-circular branch pipe, 3 is the four-way valve, 31 is the valve body, 32 is the interface, 33 is the valve core, 331 is the first flow channel, 332 is the second flow channel, 333 is the third flow channel, 34 is the knob, 4 is the spray head, 41 is the spray cavity, 42 is the spray cap, 43 is the spray hole, 44 is the spring, 45 is the adjusting core, 46 is the annular shoulder, 47 is the reduced diameter part, and 48 is the positioning groove. Detailed implementation mode

[0030] In the description of this application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", "vertical", "horizontal", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as a limitation to this application. The "first", "second", etc. involved in this application are used to distinguish the described objects and do not have any sequential or technical meaning. And the "connection" and "coupling" involved in this application, unless otherwise specified, both include direct and indirect connection (coupling).

[0031] To better understand the technical solution of this application, the above technical solution will be described in detail below in conjunction with the drawings of the specification and specific implementation modes.

[0032] This example discloses an extrusion shaping spray system for HDPE silent drainage pipes. Refer to Figure 1 , which includes two main water pipes 1 communicated with the water source. The two main water pipes 1 are arranged in parallel along the length direction of the spray box inside the spray box, so as to provide sufficient and pressurized cooling water through the two main water pipes 1 to realize the spray cooling of the pipe.

[0033] Considering that the extruded pipe is transported along the length direction of the spray box inside the spray box, in order to realize uniform and effective cooling and shaping of the pipe, in this embodiment, refer to Figure 1 , a number of annular pipes are connected in an equidistant array perpendicular to the main water pipe 1. In this example, the overall contour of the annular pipe is circular, and its center coincides with the central axis of the pipe, that is, the annular pipe is concentrically arranged outside the pipe, so as to spray towards the pipe along the circumference, so as to ensure that the cooling can be realized at all circumferential parts of the pipe, and then realize the uniform cooling and forming of the pipe, and ensure the forming quality of the pipe. Specifically, in order to realize the connection between the annular pipe and the main water pipe 1, the annular pipe includes two semi-circular branch pipes 2, which are respectively connected to the main water pipe on both sides, and the whole forms an annular pipe to achieve the circumferential spray effect.

[0034] In this embodiment, the connection between the semi-circular branch pipe 2 and the main water pipe 1 is realized through the four-way valve 3. Refer to Figure 2, the four-way valve 3 includes a valve body 31. Four interfaces 32 are annularly arrayed on the side of the valve body 31 and are respectively used to connect with the two semi-circular branch pipes 2 and the main water pipe 1. Among them, in order to enable the annular pipe to be arranged perpendicular to the main water pipe 1, in this embodiment, the adjacent interfaces 32 are vertically arranged.

[0035] Considering that different pipe materials have different spray cooling requirements, in order to control the on-off of each annular pipe or the main water pipe, so as to facilitate the adjustment of the spray area and water volume, in this embodiment, a valve core 33 is provided in the valve body 31 of the four-way valve 3. See Figure 3 , in this example, the valve core 33 is of a cylindrical structure, which includes a first flow channel 331 and a second flow channel 332 opened through the center. Among them, the first flow channel 331 and the second flow channel 332 are arranged perpendicular to each other. A third flow channel 333 is provided along the symmetry center line of the first flow channel 331 and the second flow channel 332. Thus, through the valve core 33, the separate conduction of the main water pipe or the annular pipe or the simultaneous conduction of the main water pipe and the annular pipe can be controlled.

[0036] Specifically, in this example, the left and right interfaces of the valve body are connected to the main water pipe, and the upper and lower interfaces of the valve body are connected to the annular pipe. See Figure 4 , when the valve core rotates to the ports of the first flow channel 331 and the second flow channel 332 respectively coincide with the corresponding interfaces, the four-way valve 3 is completely conducted, and the main water pipe 1 and the annular pipe are completely conducted. At this time, the water volume in the annular pipe is the maximum value. If it is necessary to reduce the water inflow in the annular pipe, only need to rotate the valve core counterclockwise. At this time, the flow channel corresponding to the main water pipe is gradually closed, and the water volume entering the annular pipe decreases accordingly. When the valve core rotates to Figure 5 the state shown, the corresponding interface of the main water pipe is completely closed, and the first flow channel 331 and the second flow channel 332 are respectively cut off by the valve body. At this time, only the third flow channel 333 conducts the two interfaces corresponding to the annular pipe, and only the conduction in the direction of the annular pipe is realized. As the valve core rotates further counterclockwise, when the valve core rotates to Figure 6 the state shown, the interfaces corresponding to the annular pipe are completely closed, and the first flow channel 331 and the second flow channel 332 are respectively cut off by the valve body. At this time, only the third flow channel 333 conducts the two interfaces corresponding to the main water pipe, and only the conduction in the direction of the main water pipe is realized. Thus, since the two semi-circular branch pipes 2 corresponding to the annular pipe are respectively connected to the main water pipe 1 through the four-way valve 3, by correspondingly adjusting the four-way valve 3, the on-off of the water flow in the corresponding main water pipe or the annular pipe can be realized. So when a leak or blockage occurs in a certain section of the pipeline, the four-way valve can be used to separately close this section of the pipeline, avoiding affecting the water supply of other pipelines, and thus realizing maintenance and replacement without shutting down the machine.

[0037] In addition, in this embodiment, in order to achieve the on-demand adjustment of the valve core 33, a knob 34 is provided at the end face of the valve body 31 and is in transmission connection with the valve core 33. Thus, by rotating the knob 34, the conduction and cut-off between the corresponding interfaces can be achieved. In addition, in order to facilitate the operator to identify the positions of the flow channels of the valve core, a flow channel identifier is provided at the end face of the knob 34, and the current angular state of the internal valve core is indicated by grooves axially parallel to each flow channel.

[0038] See Figure 1 , to achieve the spraying effect, a number of spray heads 4 are arranged in an equidistant array at the annular pipe. Each spray head is connected to the annular pipe and respectively faces the center position of the annular pipe, thereby achieving uniform spraying of the circumference of the pipe. In some other embodiments, in addition to the annular pipe, a number of spray heads are also arranged at the main water pipe in the direction of the pipe to increase the spraying and cooling effect. In some embodiments, see Figure 7 , the spray head 4 includes a spray cavity 41 and a spray cap 42. One end of the spray cavity 41 is provided with a water inlet pipe for connecting with the annular pipe or the main water pipe to receive water; the other end of the spray cavity 41 is provided with a spray cap 42, and in this example, the spray cap 42 is threadedly connected to the spray cavity 41. Among them, a number of spray holes 43 are opened at the end face of the spray cap 42. Thus, the water body in the spray cavity 41 is sprayed out from each spray hole 43 and evenly sprayed onto the surface of the pipe for spray cooling. Considering that the spray holes 43 of the existing spray heads are all arranged in a concentric annular array, resulting in a circular spray area, and then causing partial overlap of the circular spray areas corresponding to each spray head or areas that cannot be covered by each spray head, affecting the spray effect. For this reason, see Figure 7 , in this example, each spray hole 43 is arranged in a rectangular contour array, so that the area sprayed by the spray head is a rectangular area, and the boundaries of the spray areas corresponding to adjacent spray heads can be well overlapped, avoiding the problems of repeated spraying or incomplete coverage.

[0039] In this embodiment, in order to achieve the adaptive adjustment of the spraying range of the spray head 4 to adapt to different water supply water pressures and ensure that the pipe is evenly and reliably sprayed and cooled, see Figure 8 , the spray head 4 further includes a spring 44 and an adjusting core 45. Specifically, in this embodiment, a reduced-diameter portion 47 is provided at the end side of the spray cavity 41 corresponding to the spray cap 42, and an adjusting core 45 is provided in the spray cavity 41 and is matched with the reduced-diameter portion 47. In this example, the adjusting core 45 is spindle-shaped and moves along the central axis of the spray cavity 41 with the spray cap 42. Thus, the conical portion on the water-facing surface of the adjusting core 45 can reduce the water flow impact and play a guiding role, and the conical portion on the back water surface of the adjusting core 45 cooperates with the reduced-diameter portion 47 to achieve water flow adjustment. Specifically, in this embodiment, see Figure 8, the taper of the reduced-diameter portion 47 of the spray cavity is smaller than the taper of the back surface of the adjustment core 45. Thus, along the water flow direction, the gap between the adjustment core 45 and the reduced-diameter portion 47 gradually decreases, thereby realizing the pressurization of the water flow and increasing the spraying area and range of the spray head.

[0040] In addition, in this embodiment, to enable the movement of the adjustment core 45 with the spray cap 42 and to ensure the stability of the spray cap moving along the central axis of the spray cavity, refer to Figure 8 , a spring 44 is provided in the spray cavity 41. One end of the spring 44 abuts against the adjustment core 45, and the other end abuts against the cavity wall of the spray cavity 41. Additionally, a positioning post is provided at the center of the end of the adjustment core 45 corresponding to the back surface, and a positioning groove matching the positioning post is provided at the center of the spray cap 42. Thus, through the engagement of the positioning post and the positioning groove and the elastic force of the spring 44, the effect of adjusting the spraying pressure as the adjustment core 45 moves with the spray cap 42 is ensured. Among them, in order to prevent the spring from deviating due to the impact of water flow, in this example, an annular shoulder 46 is provided at the water inlet of the inner wall of the spray cavity 41 to facilitate clamping the spring outside the annular shoulder 46, and the annular shoulder 46 realizes the limit of the spring 44.

[0041] Although some preferred embodiments of the present application have been described, those skilled in the art can make additional changes and modifications to these embodiments once they know the basic creative concept. Therefore, the appended claims are intended to be interpreted to include the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0042] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of its inventive concept. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application also intends to include these modifications and variations.

Claims

1. An extrusion shaping spray system for HDPE silent drainage pipes, characterized in that, It includes two main water pipes arranged along the length direction of the spray box inside the spray box, several annular pipes perpendicularly and equidistantly arrayed and connected between the two main water pipes, and several spray heads equidistantly arrayed and connected to the pipe body of the annular pipes; the spray heads include a spray cavity for communicating with the annular pipes, and a spray cap threadedly connected to the corresponding end of the spray cavity and provided with several spray holes, and the spray holes are correspondingly arrayed in a rectangular contour.

2. The HDPE silent drain pipe extrusion and shaping spray system according to claim 1, wherein The annular pipe includes two semi-annular branch pipes, and the two semi-annular branch pipes are correspondingly connected to the main water pipe through a four-way valve.

3. The HDPE silent drain pipe extrusion and shaping spray system according to claim 2, characterized in that, The four-way valve includes a valve body, and the valve body includes interfaces respectively used for correspondingly communicating with the two semi-annular branch pipes and the main water pipe, and the adjacent interfaces are correspondingly vertically arranged.

4. The HDPE silent drain pipe extrusion and shaping spray system according to claim 3, wherein The four-way valve further includes a valve core embedded in the valve body, and the valve core includes a first flow channel and a second flow channel respectively used for correspondingly conducting the interfaces and perpendicular to each other, and a third flow channel arranged along the symmetric center line corresponding to the first flow channel and the second flow channel.

5. The HDPE silent drain pipe extrusion and shaping spray system according to claim 4, characterized in that, A knob for controlling the rotation of the valve core is provided on the corresponding end face of the valve body.

6. The HDPE silent drain pipe extrusion and shaping spray system according to claim 1, characterized in that, A spring with an axis corresponding to and coinciding with the axis of the spray cavity is arranged in the spray cavity, a spindle-shaped adjusting core is arranged between the spring and the spray cap, and a reduced-diameter part is arranged on the inner edge of the end of the spray cavity corresponding to the spray cap side along the water flow-out direction.

7. The HDPE silent drain pipe extrusion and shaping spray system according to claim 6, characterized in that, The taper of the reduced-diameter part is smaller than the taper of the conical surface of the adjusting core corresponding to the spray cap side.

8. The HDPE silent drain pipe extrusion and shaping spray system according to claim 6, wherein A water inlet is arranged in the middle of the corresponding end of the spray cavity, and an annular shoulder for limiting the spring is arranged on the inner wall of the spray cavity at the position corresponding to the water inlet.

9. The HDPE silent drain pipe extrusion and shaping spray system according to claim 6, wherein A positioning column for abutting against the spray cap is arranged at the corresponding end of the adjusting core, and a positioning groove matching with the positioning column is arranged on the corresponding end face of the spray cap.

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