A cooling tower sheet metal duct and processing method and device thereof

Abstract

The present invention discloses a cooling tower sheet metal duct and a processing method and device thereof, which relate to the technical field of cooling towers, and include an arc-shaped flange and a duct wall plate; the flange is butted against each other at the head and tail to form a circular ring; the duct wall plate is provided with side folds on both sides and end folds at both ends; mounting holes are distributed on the flange, the side folds and the end folds; the side folds are divided into multiple sections by notches evenly provided thereon; semicircular holes are provided at both ends of the flange; after the duct wall plate is bent into an arc, the head and tail are connected to each other by bolts to form a cylinder; the circular ring is connected to the end face of the cylinder by bolts. The present invention makes the duct structure of the cooling tower more stable, with higher roundness, reduced processing cost, reduced processing equipment investment, simple production process, improved production efficiency, more convenient transportation, and improved quality of the cooling tower.

Description

Technical Field

[0001] The invention relates to the technical field of cooling towers, in particular to a cooling tower sheet metal duct and a processing method and device thereof. Background Art

[0002] Existing cooling tower ducts are usually made of hand-laid fiberglass and metal materials. Hand-laid fiberglass products are not environmentally friendly. Fiberglass products cannot be degraded after being scrapped, and cannot be landfilled. Incineration also pollutes the environment. Now more and more cooling towers are using metal ducts. The diameter of cooling tower ducts is usually Between, generally, the diameter Some manufacturers use spinning equipment to spin metal sheets into tubes, which requires an investment of about 300,000 to 400,000 yuan. In addition, the spinning process requires a certain material thickness to ensure the quality of the forming. Usually, sheets of more than 2.0 mm are required. Different diameters of wind tubes require different molds. The entire processing process requires more manual labor, which exceeds For transportation reasons, the wind tube is usually made in sections. At the same time, because the price of a larger spinning machine and the mold price are more expensive, and the operation is complicated, many manufacturers use welding to produce it. The side wall of the wind tube component is a carbon steel plate, with connection holes opened on both sides and bent, and welded to the flange edges cut into arcs at the top and bottom. It is usually made into a 90-degree piece or other angles. Similarly, it requires a certain sheet thickness to ensure that the deformation is controlled during the welding process.

[0003] Whether it is formed by carbon steel spinning or flange welding, hot dip galvanizing is required afterwards, which is commonly used in the cooling tower industry. Generally, if it is not required by the contract, more expensive stainless steel materials will not be used. Hot dip galvanizing is also an environmentally unfriendly process. With the improvement of environmental awareness and the increase of supervision, a large number of galvanizing plants that do not meet the specifications have been closed.

[0004] Moreover, welding and hot-dip galvanizing processes can easily cause deformation of the duct, reducing the roundness of the duct. The fan is installed in the center of the duct. When the roundness of the duct is not high, the fan will generate greater vibration when running in the duct, which will not only affect the service life of the fan, but also increase the noise of the cooling tower and affect the surrounding environment. Summary of the invention

[0005] The present invention is based on solving the above-mentioned problems and proposes a sheet metal air duct and a processing method thereof, so that the air duct of the cooling tower has a higher roundness, a lower processing cost, a reduced investment in processing equipment, a simpler production process, improved production efficiency, and easier transportation, thereby improving the quality of the cooling tower.

[0006] To achieve the above object, the technical solution adopted by the present invention is:

[0007] A cooling tower sheet metal air duct comprises an arc-shaped flange and a cylinder wall plate; the flange is butted against each other at the head and tail to form a circular ring; the cylinder wall plate is provided with side folds on both sides and end folds at both ends; mounting holes are distributed on the flange, the side folds and the end folds; the side folds are divided into multiple sections by notches evenly provided thereon; semicircular holes are provided at both ends of the flange; after the cylinder wall plate is bent into an arc, the head and tail are connected to each other by bolts to form a cylinder; the circular ring is connected to the end face of the cylinder by bolts.

[0008] Compared with the prior art, the beneficial effects of this technical solution are:

[0009] No expensive spinning equipment, welding or hot-dip galvanizing is required. The flange and wall panels formed after processing are easier to transport. They only need to be connected together by bolts to complete the formation of the air duct. Since there is no welding process and the two ends of the air duct have overlapping side folds and flanges, the structure is more stable and has a higher roundness.

[0010] As a further improvement of the above-mentioned air duct: the flange edge and the duct wall plate are both coated plates.

[0011] The beneficial effect of the above improvement is: the air duct is directly formed by processing the coated plate, thereby improving the corrosion resistance of the air duct.

[0012] As a further improvement of the above-mentioned air duct, the connection points of the wall panels of two adjacent ducts are connected to each other through the same flange edge.

[0013] The beneficial effect of the above improvement is that two adjacent cylinder wall panels can be connected and fixed together through the same flange edge, thereby improving the connection firmness.

[0014] As a further improvement of the above-mentioned air duct: a cut tongue is provided between two adjacent mounting holes on the flange edge.

[0015] The beneficial effect of the above improvement is that the cut tongue can be inserted into the mounting hole on the side fold of the cylinder wall plate, so that the flange edge can be quickly positioned and mounted with the cylinder wall plate.

[0016] As a further improvement of the above-mentioned air duct: the thickness of the flange edge is 3-4 mm; the thickness of the duct wall plate is 1.2-2.5 mm.

[0017] The beneficial effects of the above improvements are: the flange side plate is thicker, which can increase the structural firmness of the entire air duct, and the tube wall plate is thinner, which can reduce the weight of the entire air duct and save costs.

[0018] As a further improvement of the above-mentioned air duct: notches are provided on the side folding edge at intervals of 40-70 mm.

[0019] The beneficial effect of the above improvement is that while ensuring that the cylinder wall plate is bent to form an arc-shaped structure, the side folding edge can be installed in an overlapping manner with the flange edge.

[0020] The processing method applied to the above-mentioned cooling tower sheet metal duct comprises the following steps:

[0021] Sheet metal processing: Process the sheet metal into flanges and barrel panels using CNC punching machines or laser cutting machines;

[0022] Bending process: Use a bending machine to bend the two ends and two sides of the tube wall plate to form end folds and side folds;

[0023] Assembly: overlap and fit the side folds on both sides of the cylinder wall plate with the corresponding flange edges and fix them together through bolts, and use equipment or manual auxiliary force to make the cylinder wall plate bend along the curvature of the flange edge; wherein, the end folds of two adjacent cylinder wall plates are fixed by bolts; the side folds of two adjacent cylinder wall plates are connected to each other through the same flange edge; the semicircular holes at both ends of two adjacent flange edges are combined to form a full circular hole and then fixed to the mounting hole on the side fold edge through the same bolt.

[0024] The beneficial effects of the above processing method are:

[0025] Compared with the traditional method which needs spinning equipment, welding and hot-dip galvanizing, the processing method of the present invention can complete the processing of the air duct accessories only through simple stamping, cutting and bending, and the air duct can be assembled by bolts, which greatly reduces the processing cost and improves the processing efficiency.

[0026] The processing device used in the above processing method includes an upper roller and a lower roller for clamping the flange edge and the side folding edge up and down; an inner roller and an outer roller for clamping the flange edge and / or the side folding edge on both sides; a pressing wheel for bending the cylinder wall plate;

[0027] The upper roller and the inner roller are connected to each other through a bevel gear mechanism; the upper roller or the inner roller is connected to a motor;

[0028] The upper roller and the inner roller are mounted on the first bracket;

[0029] The lower roller and the outer roller are mounted on the sliding frame;

[0030] The pressing wheel is mounted on the third bracket;

[0031] The sliding frame and the third bracket are arranged on the second bracket so as to be movable along the radial direction of the wind tube;

[0032] The second bracket is movably arranged on the first bracket.

[0033] The beneficial effects of the above processing device are:

[0034] When assembling the air duct, one end of the flange is connected and fixed to the side fold by bolts, and then the processing device is put on the flange and the side fold. After starting the motor, the device can move along the flange, so that the flange and the side fold are kept aligned on both sides through the pressure of the inner roller and the outer roller, thereby improving the installation and positioning accuracy of the side fold and the flange. The flange and the side fold can be made close to each other through the upper roller and the lower roller, further improving the positioning accuracy and facilitating the installation of bolts; the active rotation of the upper roller can make the flange slide backward, so that the rear end of the flange in front can be aligned with the front end of the flange in the back, ensuring the positioning accuracy of the flange; as the processing device moves along the flange, the pressure wheel can continuously bend the cylinder wall plate automatically according to the curvature of the flange, ensuring that the cylinder wall plate is bent into a cylindrical shape, thereby processing the assembly effect of the air duct and ensuring that the processed air duct has a higher roundness.

[0035] As a further improvement of the above-mentioned processing device: an observation hole is provided on the first bracket; a support plate is provided on the second bracket; the sliding frame is slidably arranged on the top of the support plate; the third bracket is slidably arranged on the bottom of the support plate; the rear end of the sliding frame is connected to the first adjusting screw on the second bracket; the rear end of the third bracket is connected to the second adjusting screw on the second bracket; the second bracket is connected to the first bracket through a vertical screw.

[0036] The beneficial effects of the above improvements are:

[0037] The observation hole can not only make it convenient for workers to check whether the flange edge is aligned with the side fold edge, but also make it convenient for workers to install bolts to connect and fix the flange edge with the side fold edge; by adjusting the vertical screw, the gap between the upper roller and the lower roller can be adjusted to adapt to the installation of flange edges or side fold edges of different thicknesses; by adjusting the first adjusting screw, the spacing between the inner roller and the outer roller can be adjusted to adapt to the installation of air ducts of different sizes or flange edges of different widths; by adjusting the second adjusting screw, the installation of air ducts of different sizes or flange edges of different widths can be adapted.

[0038] As a further improvement of the above processing device: the outer side wall of the first bracket is connected to the telescopic swing arm; the other end of the telescopic swing arm is hinged to the lifting rod; the lower end of the lifting rod is connected to the positioning seat.

[0039] The beneficial effect of the above improvement is that the positioning seat constitutes the center of the air duct, and the telescopic swing rod rotates around the positioning seat, thereby driving the processing device to rotate, thereby ensuring that the roundness of the processed air duct is more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a schematic diagram of the structure of the flange edge.

[0041] Figure 2 It is a schematic diagram of the structure of the tube wall panel.

[0042] Figure 3 This is a schematic diagram of the structure after the cylinder wall panel is bent to form a folded edge.

[0043] Figure 4 for Figure 3 Schematic diagram of the enlarged structure of part B in the middle.

[0044] Figure 5 It is a schematic diagram of the overall structure of the sheet metal air duct.

[0045] Figure 6 This is a structural diagram of the sheet metal air duct installation.

[0046] Figure 7 for Figure 6 Schematic diagram of the enlarged structure of local A in the middle.

[0047] Figure 8 Schematic diagram of the tongue-cut structure on the flange edge.

[0048] Fig. 9 This is a top view of the processing device structure.

[0049] Fig.10 A cross-sectional schematic diagram of the processing device.

[0050] Fig.11 It is a schematic diagram of the sliding frame and the third bracket structure on the pallet.

[0051] Fig.12 It is a schematic diagram of the side structure of the processing device.

[0052] Fig.13 The schematic diagram of the structure is that the upper roller and the lower roller are coaxially arranged with two rollers.

[0053] In the figure: 1, flange edge; 101, cut tongue; 102, arc groove; 2, cylinder plate; 201, side fold edge; 202, end fold edge; 203, notch; 3, first bracket; 4, upper roller; 5, first bevel gear; 6, second bevel gear; 7, inner roller; 8, motor; 9, second bracket; 10, connecting screw; 11, outer roller; 12, sliding frame; 13, first adjusting screw; 14, lower roller; 15, support plate; 16, second adjusting screw; 17, screw sleeve; 18, third bracket; 19, pressure wheel; 20, telescopic swing arm; 21, first bolt; 22, lifting rod; 23, second bolt; 24, positioning seat; 25, connecting rod; 26, roller; 31, observation hole; 181, sliding seat. DETAILED DESCRIPTION

[0054] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings. The description in this part is only exemplary and explanatory and should not have any limiting effect on the protection scope of the present invention.

[0055] See also Figures 1 to 13 In a specific embodiment, a cooling tower sheet metal duct includes an arc-shaped flange 1 and a duct wall plate 2; the flange 1 is butted against each other at the head and tail to form a ring; the duct wall plate 2 is provided with side folds 201 on both sides and end folds 202 at both ends; mounting holes are distributed on the flange 1, the side folds 201 and the end folds 202; the side folds 201 are divided into multiple sections by notches 203 evenly provided thereon; semicircular holes 102 are provided at both ends of the flange 1; after the duct wall plate 2 is bent into an arc, the head and tail are connected to each other by bolts to form a cylinder; the ring is connected to the end surface of the cylinder by bolts.

[0056] The flange 1 and the wall plate 2 can be processed from the coated plate into a flat plate by CNC punching or laser cutting. Generally, in the current cooling tower industry, all-steel cooling tower components usually use CNC punching machines or laser cutting machines, so there is no need to invest in special equipment. This solution does not require welding or spinning, and the requirements for sheet thickness are reduced, which can further reduce the cost of the cooling tower. Figure 2 As shown, the tube wall plate 2 is punched out with a 3-8mm width gap in the length direction and is evenly divided into several parts. Three holes are designed on each equal part, and 40X40~70x70 gaps are opened at the four corners. In the width direction, several vertically arranged holes are opened 15-40mm away from the edge.

[0057] like Figure 3 As shown, the cylinder wall plate 2 obtained by numerical control punching or laser cutting is bent to 90 degrees by a bending machine with four sides of the cylinder wall plate 2. If the production work in the factory is completed, it can be shipped as a part with other parts of the cooling tower.

[0058] During on-site assembly, the wall plate 2 and the flange edge 1 are matched, and their hole positions are matched as follows: Figure 4-7 As shown: both ends of the cylinder wall plate 2 are half holes, and the middle hole position is designed to correspond to the hole on the cylinder wall plate 2. During installation, after any corresponding holes are connected and tightened, the cylinder wall plate 2 is deformed by external force, so that it is aligned with the holes on the flange edge 1 and then fastened with bolts, and this is carried out in sequence until the entire air duct is installed.

[0059] Based on the above embodiment of the wind tube, further optimization is performed: the flange edge 1 and the tube wall plate 2 are both coated plates. Coated plates generally refer to plates with a zinc coating on the surface, which is a metal plate with an organic coating layer on the surface, and a metal coating layer on the organic coating layer. The metal coating layer can be one or more layers. Since the metal coating layer is provided on the organic coating layer with a high flatness, the coated plate is more corrosion-resistant and not easy to rust.

[0060] Based on the above embodiment of the wind tube, further optimization is performed: the connection between two adjacent tube wall panels 2 is connected to each other through the same flange edge 2. Figure 7 As shown, two adjacent cylinder wall panels 2 are connected by the same flange edge 2, so that the connection firmness of the two adjacent cylinder wall panels 2 can be improved; the end folded edges of the two adjacent cylinder wall panels 2 are connected by bolts.

[0061] Based on the above embodiment of the wind tube, a further optimization is made: a cut tongue 101 is provided between two adjacent mounting holes on the flange edge 1. Figure 8 As shown, a mounting hole corresponding to the position of the cut tongue 101 can be provided on the side fold, and the cut tongue 101 can be inserted into the corresponding mounting hole on the side fold, so that the flange edge 1 and the side fold can be quickly positioned.

[0062] Based on the above embodiment of the wind tube, further optimization is made: the thickness of the flange edge 1 is 3-4 mm; the thickness of the tube wall plate 2 is 1.2-2.5 mm. The flange edge 1 is usually processed with a plate with a thickness of 3-4 mm, and the tube wall plate 2 can be processed with a plate with a thickness of 1.2-2.5 mm.

[0063] The above embodiment of the hair dryer is further optimized as follows: the side fold edge 201 is provided with notches 203 at intervals of 40-70 mm.

[0064] The processing method applied to the above-mentioned cooling tower sheet metal duct comprises the following steps:

[0065] Sheet metal processing: The sheet metal is processed into flange edge 1 and barrel wall plate 2 by CNC punching machine or laser cutting machine; Figure 1-2 As shown;

[0066] Bending process: Use a bending machine to bend the two ends and two sides of the tube wall plate 2 to form end folds 202 and side folds 201; Figure 3 As shown;

[0067] like Figure 6 , 9As shown, assembly: overlap and fit the side folds 201 on both sides of the cylinder wall plate 2 with the corresponding flange edges 1 and then fix them together by bolts, and use equipment or manual auxiliary force to make the cylinder wall plate 2 bend along the curvature of the flange edge 1; wherein, the end folds 202 of the two adjacent cylinder wall plates 2 are fixed by bolts; the connection points of the side folds 201 of the two adjacent cylinder wall plates 2 are connected to each other through the same flange edge 1; the semicircular holes 102 at both ends of the two adjacent flange edges 1 are combined to form a full circular hole and then fixed to the mounting hole on the side fold 201 by the same bolt.

[0068] like Figure 9-12 As shown, the processing device used in the above processing method includes an upper roller 4 and a lower roller 14 for clamping the flange 1 and the side fold 201 up and down; an inner roller 7 and an outer roller 11 for clamping both sides of the flange 1 and / or the side fold 201; and a pressing wheel 19 for bending the cylinder wall plate 2;

[0069] The upper roller 4 and the inner roller 7 are connected to each other through a bevel gear mechanism; the upper roller 4 or the inner roller 7 is connected to the motor 8;

[0070] The upper roller 4 and the inner roller 7 are mounted on the first bracket 3;

[0071] The lower roller 14 and the outer roller 11 are mounted on the sliding frame 12;

[0072] The pressing wheel 19 is mounted on the third bracket 18;

[0073] The sliding frame 12 and the third bracket 18 are arranged on the second bracket 9 so as to be movable along the radial direction of the wind tube;

[0074] The second bracket 9 is movably disposed on the first bracket 3 .

[0075] Among them, Fig. 9 As shown, the first bracket 3 includes a top surface, both sides of the top surface are bent downward to form a folded edge, and the left folded edge is further bent inward to form a secondary folded edge; the upper roller 4 is horizontally installed below the top surface; the inner roller 7 is vertically installed on the inner side of the left folded edge;

[0076] The second bracket 3 is plate-shaped, with an inverted L-shaped cross-section and a screw hole at the top for installing the vertical screw 10; a support plate 15 is installed on the inner side of the second bracket; slots are provided on the upper and lower sides of the support plate 15, and the upper slot is used to snap into the sliding frame 12; the bottom T-shaped slot is used to snap into the sliding seat 181 at the upper end of the third bracket 18; a screw hole is provided at the rear end of the sliding frame 12, which is connected to the first adjusting screw 13 on the second bracket 9; a screw sleeve 17 is provided at the rear end of the third bracket 18, which is threadedly connected to the second adjusting screw 16 on the second bracket 9; the first adjusting screw 13 and the second adjusting screw 16 can rotate on the second bracket 9, but cannot move axially.

[0077] like Fig.13 As shown, the upper roller 4 and the lower roller 14 can be composed of two rollers arranged coaxially, with a gap left between the rollers to facilitate the passage of bolts on the flange or side fold.

[0078] The above-mentioned processing device embodiment is further optimized: an observation hole 31 is provided on the first bracket 3; a support plate 15 is provided on the second bracket 9; the sliding frame 12 is slidably provided on the top of the support plate 15; the third bracket 18 is slidably provided on the bottom of the support plate 15; the rear end of the sliding frame 12 is connected to the first adjusting screw 13 on the second bracket 9; the rear end of the third bracket 18 is connected to the second adjusting screw 16 on the second bracket 9; the second bracket 9 is connected to the first bracket 3 via a vertical screw 10.

[0079] like Fig. 9 As shown, the observation hole 31 is rectangular, and its width is generally greater than the width of the flange edge; it is arranged in the middle position of the first bracket.

[0080] The vertical screw rod 10, the first adjusting screw rod and the second adjusting screw rod can all be butterfly screw rods for easy operation. The vertical screw rod 10 passes through the through hole on the first bracket from top to bottom and is threadedly connected with the screw hole on the second bracket 9.

[0081] When in use, first hang the first bracket on the flange edge, then press the second bracket upward from the bottom of the side fold, and then pass the vertical screw 10 from top to bottom through the through hole on the first bracket and threadedly connect it with the screw hole on the second bracket 9; when the vertical screw 10 is loosened, the second bracket 9 can be removed.

[0082] By adjusting the tightness of the vertical screw 10, the distance between the upper roller and the lower roller can be controlled; by adjusting the tightness of the first adjusting screw, the distance between the inner roller and the outer roller can be controlled; and by adjusting the tightness of the second adjusting screw, the extrusion force of the pressure wheel 19 on the cylinder wall can be controlled.

[0083] The above processing device embodiment is further optimized: the outer wall of the first bracket 3 is connected to the telescopic swing arm 20; the other end of the telescopic swing arm 20 is hinged to the lifting rod 22; the lower end of the lifting rod 22 is connected to the positioning seat 24.

[0084] like Fig. 9 , 10As shown, the positioning length of the telescopic swing arm 20 can be adjusted by the first bolt 21. After loosening the first bolt 21, the telescopic swing arm 20 is lengthened, and then the first bolt 21 is tightened to fix the length; the height of the lifting rod 22 can be adjusted by the second bolt 23. After the lifting rod 22 is lengthened, the second bolt 23 is tightened to fix the height; the length of the telescopic swing arm 20 constitutes the radius length of the wind tube, and the total height of the lifting rod 22 and the positioning seat 24 constitutes the wall height of the wind tube; during operation, the positioning seat 24 is fixed, and when the motor 8 drives the device to move, the telescopic swing arm 20 rotates, thereby ensuring that the roundness of the wind tube is more accurate.

[0085] How to use this processing device:

[0086] Align the flange 1 with the side fold 201, connect them by passing bolts through the mounting holes, then mount the first bracket 3 of the device on the flange 1, with the positioning seat 24 located at the center of the wind tube; then press the second bracket 9 from the lower end against the lower side fold on the outside of the wind tube, then pass the vertical screw 10 through the through-hole on the top surface of the first bracket 1 and connect it to the threaded hole at the upper end of the second bracket 9; adjust the tightness of the vertical screw 10 so that the upper roller 4 and the lower roller 14 clamp the flange 1 and the side fold 201; rotate the first adjusting screw 13 so that the outer roller and the inner roller clamp the flange 1 or the sides of the side fold 201; rotate the second adjusting screw 16 so that the pressure wheel 19 presses against the wall of the tube; then start the motor 8 to drive the processing device to move forward along the flange 1. , fix the initial section of the flange edge manually or with other equipment to prevent the flange edge from moving with the equipment; as the equipment moves, the flange edge 1 is aligned and overlapped with the side fold edge 201, and then the barrel wall plate is automatically bent along the curvature of the flange edge 1, so that workers do not need to manually operate to position the flange edge and the side fold edge, and only need to directly pass the bolts through the mounting holes on the flange edge 1 and connect them with the side fold edge; when the equipment is in use and encounters an obstruction from the end fold edge 202 of the barrel wall plate, the second adjusting screw 16 can be loosened or the first adjusting screw 13 can be loosened, so that the pressure wheel 19 is relaxed or the lower roller 14 is relaxed to avoid collision with the end fold edge 202, and after jumping over the end fold edge 202, the second adjusting screw 16 can be tightened again to make the pressure wheel 19 press the next barrel wall plate.

[0087] It should be noted that, in this article, the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus.

[0088] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. The above is only a preferred implementation of the present invention. It should be pointed out that due to the limitations of textual expression and the objective existence of infinite specific structures, ordinary technicians in this technical field can make several improvements, modifications or changes without departing from the principles of the present invention, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the inventive concept and technical solution to other occasions without improvement, should be regarded as the protection scope of the present invention.

Claims

1. A sheet metal air duct for a cooling tower, characterized in that: The invention comprises an arc-shaped flange (1) and a cylinder wall plate (2); the flange (1) is butted at the head and tail to form a circular ring; the cylinder wall plate (2) is provided with side folds (201) on both sides and end folds (202) at both ends; mounting holes are distributed on the flange (1), the side folds (201) and the end folds (202); the side folds (201) are divided into multiple sections by notches (203) evenly provided thereon; semicircular holes (102) are provided at both ends of the flange (1); after the cylinder wall plate (2) is bent into an arc shape, the head and tail are connected to each other by bolts to form a cylinder; the circular ring is connected to the end surface of the cylinder by bolts; The side folded edges (201) on both sides of the cylinder wall plate (2) overlap and fit with the corresponding flange edges (1) and are then connected and fixed by bolts, and the cylinder wall plate (2) is bent along the curvature of the flange edge (1); wherein the end folded edges (202) of two adjacent cylinder wall plates (2) are connected and fixed by bolts; the connecting parts of the side folded edges (201) of two adjacent cylinder wall plates (2) are connected to each other through the same flange edge (1); and the semicircular holes (102) at both ends of the two adjacent flange edges (1) are combined to form a full circular hole and are then connected and fixed to the mounting hole on the side folded edge (201) by the same bolt.

2. A cooling tower sheet metal duct according to claim 1, characterized in that: The flange edge (1) and the barrel wall plate (2) are both coated plates.

3. A cooling tower sheet metal duct according to claim 1, characterized in that: A cut tongue (101) is provided between two adjacent mounting holes on the flange edge (1).

4. The sheet metal air duct of a cooling tower according to claim 1, characterized in that: The thickness of the flange edge (1) is 3-4 mm; the thickness of the barrel wall plate (2) is 1.2-2.5 mm.

5. The sheet metal air duct of a cooling tower according to claim 1, characterized in that: The side fold edge (201) is provided with notches (203) at intervals of 40-70 mm.

6. A method for processing a cooling tower sheet metal duct according to any one of claims 1 to 5, characterized in that: The steps include:

1. Sheet metal processing: Processing the sheet metal into flange edge (1) and barrel wall plate (2) by CNC punching machine or laser cutting machine; 2. Bending processing: using a bending machine to bend the two ends and two sides of the tube wall plate (2) to form end folded edges (202) and side folded edges (201).

7. A processing device used in the processing method of a cooling tower sheet metal duct according to claim 6, characterized in that: It comprises an upper roller (4) and a lower roller (14) for clamping the flange edge (1) and the side folding edge (201) up and down; an inner roller (7) and an outer roller (11) for clamping the flange edge (1) and the side folding edge (201) on both sides; and a pressing wheel (19) for bending the cylinder wall plate (2); The upper roller (4) and the inner roller (7) are connected to each other via a bevel gear mechanism; the upper roller (4) or the inner roller (7) is connected to a motor (8); The upper roller (4) and the inner roller (7) are mounted on the first bracket (3); The lower roller (14) and the outer roller (11) are mounted on a sliding frame (12); The pressing wheel (19) is mounted on the third bracket (18); The sliding frame (12) and the third bracket (18) are arranged on the second bracket (9) so as to be movable along the radial direction of the wind tube; The second bracket (9) is arranged on the first bracket (3) so as to be movable up and down.

8. The processing device for a processing method for a cooling tower sheet metal duct according to claim 7, characterized in that: The first bracket (3) is provided with an observation hole (31); the second bracket (9) is provided with a support plate (15); the sliding bracket (12) is slidably arranged on the top of the support plate (15); the third bracket (18) is slidably arranged on the bottom of the support plate (15); the rear end of the sliding bracket (12) is connected to the first adjusting screw (13) on the second bracket (9); the rear end of the third bracket (18) is connected to the second adjusting screw (16) on the second bracket (9); the second bracket (9) is connected to the first bracket (3) via a vertical screw (10).

9. The processing device for a processing method for a cooling tower sheet metal duct according to claim 7, characterized in that: The outer wall of the first bracket (3) is connected to a telescopic swing rod (20); the other end of the telescopic swing rod (20) is hinged to a lifting rod (22); and the lower end of the lifting rod (22) is connected to a positioning seat (24).

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