Spraying adjusting method for controlling ovality in PE pipe production process

Abstract

The invention discloses a spraying adjusting method for controlling ovality in a PE pipe production process, which comprises the following steps: a plurality of spraying heads are mounted on the inner wall surface of a water tank at intervals, and the plurality of spraying heads are symmetrically arranged by taking the central position of the water tank as a central point when being mounted; symmetrically-arranged spraying heads are connected through a connecting rope and calibrated through a calibration device, and if the connecting rope passes through the center point of the water tank, it is judged that the spraying heads are aligned to the center position of the pipe; if the connecting rope does not pass through the central point of the water tank, judging that the spray header is not aligned with the central position of the pipe, then adjusting the position of the connecting rope to enable the connecting rope to pass through the central point of the water tank, and rotating the spray header to adjust the angle of the spray header according to the adjusted connecting rope to enable the orientation of the end part of the spray header to be consistent with the direction of the connecting rope; and judging that the spray header is aligned with the central position of the pipe. It can be guaranteed that the end of the spraying head is accurately aligned with the center position of the pipe, and then the surface of the pipe is evenly sprayed in the spraying process.

Description

Technical Field

[0001] The invention belongs to the technical field of pipe production, and in particular relates to a spray adjustment method for controlling the ovality in a PE pipe production process. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] At present, in the production process of PE pipes (hereinafter referred to as pipes), the pipes need to go through three general steps: extrusion, cooling, and molding. In the cooling process, the pipes need to be quickly cooled and molded through a cooling water tank. The spray device in the cooling water tank is usually designed with multiple nozzles, which are arranged circumferentially and side by side in the modified cold water tank, and can spray water mist on the surface of the pipe for cooling. When the pipe is cooled through the water tank, it is often affected by uneven cooling or external forces such as its own gravity and the force of the traction device, which will cause uneven shrinkage during the cooling process, thereby causing ovality problems. When welding PE pipes with large ovality, the strength of the welded joint may be reduced due to the unevenness of the pipe end face. Stress concentration is prone to occur at the joints, which affects the pressure-bearing capacity and service life of the entire pipeline system. In addition, PE pipe standards such as GB / T13663.2-2018, GB / T15558.2-2023, CJ / T358-2019, and CJ / T250-2018 have clear deviation requirements for pipe roundness.

[0004] To solve the above problems, in the production control process, the control method generally used is to add a clamp-type rounding device when the pipe leaves the cooling water tank. However, after the pipe passes through the cooling water tank, especially for thin-walled PE pipes, due to its thin wall thickness and fast cooling and forming speed, the effect of correction by the traditional clamp-type rounding device may not be significant after the pipe leaves the cooling water tank. If the angle of the spray head is inaccurate, it will cause uneven spraying on the surface of the pipe, and then the ovality of the pipe cannot be controlled, resulting in deformation and cracking of the pipe. At this time, the adjustment of the angle of the spray device is particularly important, which can directly control the ovality of the pipe during the cooling process of the pipe. Summary of the invention

[0005] In view of the above problems, the present invention provides a spray adjustment method for controlling the ovality of PE pipe production process, which can ensure that the end of the spray head is accurately aligned with the center position of the pipe, so that the surface of the pipe is sprayed evenly during spraying, and the ovality of the pipe can be directly controlled during the cooling process of the pipe to prevent the pipe from deformation and cracking.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] A spray adjustment method for controlling the ovality of a PE pipe production process comprises the following steps:

[0008] Installing a plurality of sprinkler heads at intervals on the inner wall surface of the water tank, wherein the sprinkler heads are symmetrically arranged with the center position of the water tank as the center point during installation;

[0009] Connect the symmetrically arranged sprinkler heads through a connecting rope and calibrate them through a calibration device. If the connecting rope passes through the center point of the water tank, it is determined that the sprinkler head is aligned with the center position of the pipe.

[0010] If the connecting rope does not pass through the center point of the water tank, it is determined that the sprinkler head is not aligned with the center position of the pipe. Then adjust the position of the connecting rope so that the connecting rope passes through the center point of the water tank. Then, according to the adjusted connecting rope, rotate the sprinkler head to adjust the angle of the sprinkler head so that the direction of the sprinkler head end is consistent with the direction of the connecting rope. At this time, it is determined that the sprinkler head is aligned with the center position of the pipe.

[0011] Furthermore, the calibration device is a square, one long side of the square is placed close to the connecting rope, and one end of the square is placed against the sprinkler head. At this time, the other end of the square passes through the center point of the water tank or does not pass through the center point of the water tank. The position of the connecting rope is judged to be accurate based on the position of the other end of the square.

[0012] Further, the shower heads include a first shower head, a second shower head, a third shower head, a fourth shower head, a fifth shower head, a sixth shower head, a seventh shower head and an eighth shower head.

[0013] Furthermore, when the shower heads are installed, the first shower head and the fifth shower head are symmetrically arranged, and the second shower head and the sixth shower head are symmetrically arranged.

[0014] Furthermore, the third shower head and the seventh shower head are symmetrically arranged, and the fourth shower head and the eighth shower head are symmetrically arranged.

[0015] Furthermore, the connecting rope is a rubber rope, and the connecting rope includes a first connecting rope, a second connecting rope, a third connecting rope and a fourth connecting rope.

[0016] Furthermore, the first connecting rope connects the first sprinkler head and the fifth sprinkler head, and the second connecting rope connects the second sprinkler head and the sixth sprinkler head.

[0017] Furthermore, the third connecting rope connects the third sprinkler head and the seventh sprinkler head, and the fourth connecting rope connects the fourth sprinkler head and the eighth sprinkler head.

[0018] Furthermore, the first connecting rope, the second connecting rope, the third connecting rope and the fourth connecting rope all need to be calibrated by a calibration device after installation.

[0019] Furthermore, if the first connecting rope, the second connecting rope, the third connecting rope and the fourth connecting rope pass through the center point of the water tank after calibration, there is no need to rotate the sprinkler head to adjust the angle; if they do not pass through the center point of the water tank, it is necessary to adjust the positions of the first to fourth connecting ropes, and then rotate the sprinkler head to adjust the angle. After the adjustment is completed, the calibration device is used to check whether the adjusted sprinkler head angle is accurate.

[0020] Compared with the prior art, the present invention has the following advantages and positive effects:

[0021] The present invention adjusts the angle of the spray head by cooperating with a connecting rope and a calibration device, ensures that the spraying position of the spray head is toward the center of the pipe, and makes the surface of the pipe sprayed evenly during spraying, and then directly controls the ovality of the pipe during the cooling process of the pipe to ensure the uniformity of cooling. The improvement of cooling uniformity helps to maintain the stable shape of the pipe during the cooling process, and reduces quality problems such as elliptical deformation and cracking; reduces the scrap rate and improves the yield rate, can reduce production costs and improve production efficiency; the method is suitable for the production of PE pipes of different specifications and wall thicknesses, and has strong flexibility and adaptability. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0023] Figure 1 It is a schematic diagram of the position of the sprinkler head of the present invention;

[0024] Figure 2 It is a schematic diagram of the position of the connecting rope of the present invention;

[0025] Figure 3 is a schematic diagram of the calibration state of the calibration device of the present invention;

[0026] Figure 4 It is a front view of the water tank of the present invention;

[0027] Figure 5 is a side cross-sectional view of a water tank of the present invention;

[0028] In the figure: 1. water tank; 2. sprinkler head; 21. first sprinkler head; 22. second sprinkler head; 23. third sprinkler head; 24. fourth sprinkler head; 25. fifth sprinkler head; 26. sixth sprinkler head; 27. seventh sprinkler head; 28. eighth sprinkler head; 3. pipe; 4. connecting rope; 41. first connecting rope; 42. second connecting rope; 43. third connecting rope; 44. fourth connecting rope; 5. calibration device; 6. center point of water tank; 7. positioning bolt; 8. sizing sleeve; 9. nylon support plate; 10. nylon support wheel. DETAILED DESCRIPTION

[0029] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0030] The present invention is described in detail below in conjunction with the accompanying drawings. The present embodiment discloses a spray adjustment method for controlling the ovality of a PE pipe 3 during production. Figure 3 As shown, a plurality of spray heads 2 are installed at intervals on the inner wall surface of the water tank 1, and the plurality of spray heads 2 are installed symmetrically with the center position of the water tank 1 as the center point;

[0031] The symmetrically arranged sprinkler heads 2 are connected by connecting ropes 4 and calibrated by a calibration device 5. If the connecting rope 4 passes through the center point 6 of the water tank, it is determined that the sprinkler head 2 is aligned with the center position of the pipe 3.

[0032] If the connecting rope 4 does not pass through the center point 6 of the water tank, it is determined that the sprinkler head 2 is not aligned with the center position of the pipe 3. Then, the position of the connecting rope 4 is adjusted so that the connecting rope 4 passes through the center point 6 of the water tank. Then, according to the adjusted connecting rope 4, the sprinkler head 2 is rotated to adjust the angle of the sprinkler head 2 so that the direction of the end of the sprinkler head 2 is consistent with the direction of the connecting rope 4. At this time, it is determined that the sprinkler head 2 is aligned with the center position of the pipe 3.

[0033] How to determine the center point of the water tank for different types of pipe production: Figure 4 and Figure 5 As shown, PE pipes are produced by extrusion. When PE particles are extruded into tube blanks through a heated die, the tube blanks immediately pass through a sizing sleeve 8 (a through-type die that determines the outer diameter of the pipe, selected according to the model) and enter the vacuum water tank. The sizing sleeve 8 is installed at the pipe inlet end of the water tank 1 through positioning bolts 7, and the fixed position is located at the center of the water tank 1; further, the production of different types of pipes will select suitable semicircular nylon support plates 9 and nylon support wheels 10 that can be raised and lowered in the vacuum water tank for assistance, so that the pipe is always horizontally located in the center of the water tank after passing through the sizing sleeve and entering the vacuum water tank.

[0034] The calibration device 5 is a square ruler. One long side of the square ruler is placed close to the connecting rope 4, and one end of the square ruler is placed against the sprinkler head 2. At this time, the other end of the square ruler passes through the center point 6 of the water tank or does not pass through the center point 6 of the water tank. The position of the connecting rope 4 is judged to be correct based on the position of the other end of the square ruler.

[0035] A corresponding positioning device is set at the front end process of the water tank 1, so that the pipe 3 is located at the center of the water tank 1 when entering the water tank 1, that is, the center point of the pipe 3 coincides with the center point 6 of the water tank, so that the angle of the spray head 2 determined according to the center point 6 of the water tank is accurate. The angle of the spray head 2 is adjusted by the connection rope and the calibration device 5 to ensure that the spray position of the spray head 2 is toward the center of the pipe 3, so that the surface of the pipe 3 is sprayed evenly during the spraying, and then the ovality of the pipe 3 is directly controlled during the cooling process of the pipe 3 to ensure the uniformity of cooling and avoid deformation and cracking of the pipe 3.

[0036] Pipe 3 is a PE pipe, which is a highly crystalline, non-polar thermoplastic resin. The appearance of the original HDPE is milky white, and it is translucent to a certain extent in the thin section. PE has excellent resistance to most domestic and industrial chemicals.

[0037] The spray head 2 includes a first spray head 21, a second spray head 22, a third spray head 23, a fourth spray head 24, a fifth spray head 25, a sixth spray head 26, a seventh spray head 27 and an eighth spray head 28. When the spray heads are installed, the first spray head 21 and the fifth spray head 25 are symmetrically arranged, the second spray head 22 and the sixth spray head 26 are symmetrically arranged, the third spray head 23 and the seventh spray head 27 are symmetrically arranged, and the fourth spray head 24 and the eighth spray head 28 are symmetrically arranged.

[0038] The end of the spray head 2 is rotatable, and the spray head 2 is connected to the inside of the water tank 1. The water in the water tank 1 is pumped to the spray head 2 for spraying through a corresponding pumping device;

[0039] When installing the connecting rope 4, the sprinkler head 2 needs to be removed, and then the end of the connecting rope 4 is put on the center hole of the sprinkler head 2, and then the sprinkler head 2 is tightened and fixed. Figure 1 As shown, after the installation of the spray head 2, the angle of the end of the spray head 2 will have a certain deviation. At this time, the angle of the spray head 2 needs to be adjusted to ensure that the end of the spray head 2 is aligned with the center position of the pipe 3. After adjusting the angles of the first to eighth spray heads 28 through the connection rope 4 and the calibration device 5, the connection rope 4 is removed, and the pipe 3 is transported to the center position of the water tank 1 for spraying. The spray head 2 is provided with multiple ends so that the surface of the pipe 3 can be sprayed evenly. The ends of each two spray heads 2 are arranged opposite to each other. After being connected by a connection rope 4, the spray rope passes through the center point 6 of the water tank, which means that the angles of the two spray heads are accurate.

[0040] like Figure 2As shown, the connecting rope 4 includes a first connecting rope 41, a second connecting rope 42, a third connecting rope 43 and a fourth connecting rope 44. The first connecting rope 41 connects the first spray head 21 and the fifth spray head 25, and the second connecting rope 42 connects the second spray head 22 and the sixth spray head 26. The third connecting rope 43 connects the third spray head 23 and the seventh spray head 27, and the fourth connecting rope 44 connects the fourth spray head 24 and the eighth spray head 28. The connecting rope 4 is a rubber rope, which is elastic and is tightened when connecting two spray heads; the first connecting rope 41, the second connecting rope 42, the third connecting rope 43 and the fourth connecting rope 44 need to be calibrated by the calibration device 5 after installation. If the first connecting rope 41, the second connecting rope 42, the third connecting rope 43 and the fourth connecting rope 44 pass through the center point 6 of the water tank after calibration, there is no need to rotate the sprinkler head 2 to adjust the angle; if they do not pass through the center point 6 of the water tank, it is necessary to adjust the positions of the first to fourth connecting ropes 44, and then rotate the sprinkler head 2 to adjust the angle. After the adjustment is completed, check whether the adjusted angle of the sprinkler head 2 is accurately adjusted through the calibration device 5 to further ensure the accuracy of the angle adjustment of the sprinkler head 2 and avoid adjustment errors.

[0041] Although the above describes the specific implementation mode of the present invention in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art on the basis of the technical solution of the present invention without creative work are still within the scope of protection of the present invention.

Claims

1. A spray adjustment method for controlling the ovality of PE pipe production process, characterized in that: The following steps are involved: Installing a plurality of sprinkler heads at intervals on the inner wall surface of the water tank, wherein the sprinkler heads are symmetrically arranged with the center position of the water tank as the center point during installation; Connect the symmetrically arranged sprinkler heads through a connecting rope and calibrate them through a calibration device. If the connecting rope passes through the center point of the water tank, it is determined that the sprinkler head is aligned with the center position of the pipe. If the connecting rope does not pass through the center point of the water tank, it is determined that the sprinkler head is not aligned with the center position of the pipe. Then adjust the position of the connecting rope so that the connecting rope passes through the center point of the water tank. Then, according to the adjusted connecting rope, rotate the sprinkler head to adjust the angle of the sprinkler head so that the direction of the sprinkler head end is consistent with the direction of the connecting rope. At this time, it is determined that the sprinkler head is aligned with the center position of the pipe.

2. A spray adjustment method for controlling the ovality of a PE pipe production process as claimed in claim 1, characterized in that: The calibration device is a square. One long side of the square is placed close to the connecting rope, and one end of the square is placed against the sprinkler head. At this time, the other end of the square passes through the center point of the water tank or does not pass through the center point of the water tank. The position of the connecting rope is judged to be accurate based on the position of the other end of the square.

3. A spray adjustment method for controlling the ovality of a PE pipe production process as claimed in claim 1, characterized in that: The shower heads include a first shower head, a second shower head, a third shower head, a fourth shower head, a fifth shower head, a sixth shower head, a seventh shower head and an eighth shower head.

4. A spray adjustment method for controlling the ovality of a PE pipe production process as claimed in claim 3, characterized in that: When the spray heads are installed, the first spray head and the fifth spray head are symmetrically arranged, and the second spray head and the sixth spray head are symmetrically arranged.

5. A spray adjustment method for controlling the ovality of a PE pipe production process as claimed in claim 4, characterized in that: The third spray head and the seventh spray head are symmetrically arranged, and the fourth spray head and the eighth spray head are symmetrically arranged.

6. A spray adjustment method for controlling the ovality of a PE pipe production process as claimed in claim 5, characterized in that: The connecting rope is a rubber rope, and the connecting rope includes a first connecting rope, a second connecting rope, a third connecting rope and a fourth connecting rope.

7. A spray adjustment method for controlling the ovality of a PE pipe production process as claimed in claim 6, characterized in that: The first connecting rope connects the first sprinkler head and the fifth sprinkler head, and the second connecting rope connects the second sprinkler head and the sixth sprinkler head.

8. A spray adjustment method for controlling the ovality of a PE pipe production process as claimed in claim 7, characterized in that: The third connecting rope connects the third sprinkler head and the seventh sprinkler head, and the fourth connecting rope connects the fourth sprinkler head and the eighth sprinkler head.

9. A spray adjustment method for controlling the ovality of a PE pipe production process as claimed in claim 8, characterized in that: The first connecting rope, the second connecting rope, the third connecting rope and the fourth connecting rope all need to be calibrated by a calibration device after installation.

10. A spray adjustment method for controlling the ovality of a PE pipe production process as claimed in claim 9, characterized in that: If the first connecting rope, the second connecting rope, the third connecting rope and the fourth connecting rope pass through the center point of the water tank after calibration, there is no need to rotate the sprinkler head to adjust the angle; if they do not pass through the center point of the water tank, it is necessary to adjust the positions of the first to fourth connecting ropes, and then rotate the sprinkler head to adjust the angle. After the adjustment is completed, check whether the adjusted sprinkler head angle is accurate through the calibration device.

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