Corrugated heating and ventilation pipe forming method

Abstract

The invention relates to the technical field of corrugated heating and ventilation pipe forming, in particular to a corrugated heating and ventilation pipe forming method which comprises the following steps: S1, feeding: selecting a proper pipe, inserting the pipe into a feeding hole of a forming device, and supporting the pipe in the feeding process; s2, conveying is conducted, specifically, the pipes enter a conveying unit through a feeding port, the conveying unit clamps and rolls the side walls of the pipes, and the pipes are driven to be rotationally conveyed through friction between the side walls of the pipes and the conveying unit; s3, heating is conducted, specifically, the pipe conveyed through the conveying unit penetrates through a heating unit; the pipe is driven by the conveying unit to be conveyed in a rotating mode, the pipe penetrates through the heating unit to cause temperature rise, the surface of the pipe is prone to deformation, the pipe with the temperature increased enters the rolling device in a rotating mode, corrugation rolling is conducted on the side wall of the pipe through a pressing cutter in the rolling device, corrugation rolling is conducted on the pipe after the pipe is heated, and the difficulty of corrugation forming on the surface of the pipe is lowered; and the corrugation forming efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the field of corrugated HVAC pipe forming, and specifically to a corrugated HVAC pipe forming method. Background Art

[0002] Corrugated HVAC pipes are used inside HVAC equipment. They have corrugations with a fixed pitch on the surface, can be bent and deformed, and have good pressure-bearing capacity. There are various methods for forming the corrugations on the surface of corrugated HVAC pipes.

[0003] Existing corrugated HVAC pipe forming methods, such as a corrugated pipe spinning forming method proposed in patent application number "CN201410246770.4", include the following steps: S1. Install a long thin-walled pipe on the main shaft of a spinning machine, and apply an axial traction force to the tail end of the long thin-walled pipe. The main shaft drives the long thin-walled pipe to rotate; S2. Three spinning wheels of the spinning machine synchronously feed in the radial direction to spin the wall of the long thin-walled pipe. After the waveform is formed behind the spinning wheel, an axial feed movement is started, and the axial feed rate is 1 - 2 mm / r. After stopping the axial feed, the three spinning wheels synchronously retract in the radial direction, then feed axially by one waveform width, and then synchronously feed in the radial direction again for the next cycle. The present invention not only completely eliminates the longitudinal welds of tunnel pipe parts, but also can reduce the circumferential welds.

[0004] However, there are defects in the existing technology. It forms corrugations by directly processing the surface of the pipe. For some pipes with higher hardness such as stainless steel pipes, it is difficult to form corrugations on the surface, resulting in low corrugation forming efficiency. Therefore, a corrugated HVAC pipe forming method is proposed. Summary of the Invention

[0005] The purpose of the present invention is to provide a corrugated HVAC pipe forming method to solve the problems raised in the above background art.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] A corrugated HVAC pipe forming method, the forming method includes the following steps:

[0008] S1. Loading

[0009] Select a suitable pipe, insert the pipe into the feed port of the forming device, and provide support and guidance during the pipe loading process.

[0010] S2. Conveying

[0011] The pipe enters the interior of the conveying unit through the feed port. The conveying unit clamps and rolls the side wall of the pipe, and drives the pipe to rotate and convey through the friction between the side wall of the pipe and the conveying unit.

[0012] S3. Heating

[0013] The pipe conveyed by the conveying unit passes through the heating unit, and the heating unit heats the side wall of the pipe, making the side wall of the pipe easy to deform;

[0014] S4. Rolling

[0015] The heated pipe is conveyed into the rolling unit. A pressing tool is arranged inside the rolling unit. As the pipe is conveyed in a rotating manner, the pressing tool presses corrugations on the side wall of the pipe;

[0016] S5. Cooling

[0017] The pipe after roll forming passes through the cooling unit, and the cooling unit cools down the pipe wall, making the corrugations on the side wall of the pipe stable;

[0018] S6. Discharging

[0019] The cooled pipe is discharged through the discharge port. The discharge port supports and guides the pipe to prevent one end of the pipe from sagging due to weight or the pipe from tilting.

[0020] Preferably, the axes of the discharge port, the conveying unit, the heating unit, the rolling unit, the cooling unit, and the blanking port are on the same straight line, and the distances between the discharge port, the conveying unit, the heating unit, the rolling unit, the cooling unit, and the blanking port are adjustable.

[0021] Preferably, the diameter size of the pipe is one of 9mm, 12mm, and 19mm.

[0022] Preferably, the rolling unit is provided with three groups of pressing tools, and the three groups of pressing tools process the side wall of the pipe simultaneously, and the number of pressing tools is adjustable.

[0023] Preferably, the distance between adjacent pressing tools is set to 5mm, the feed depth of the pressing tool is 0.5 - 2mm, the feed angle of the pressing tool is 0 - 35 degrees, and the corrugation pressing speed of the pressing tool is 10 - 50 revolutions per second.

[0024] Preferably, the internal temperature of the heating unit is set to 800 - 1000 °C.

[0025] Preferably, the cooling method adopted by the cooling unit is at least one of air cooling, water cooling, and liquid nitrogen cooling, and the cooling unit cools the pipe by 800 - 970 °C.

[0026] Preferably, a ranging and speed measuring sensor is arranged at one end of the conveying unit, and the ranging and speed measuring sensor is used to detect the feeding speed and feeding length of the pipe.

[0027] Advantages of the present invention:

[0028] In the present invention, the feeding and guiding unit supports and guides the pipe, enabling the pipe to be inserted into the conveying unit in alignment. The conveying unit drives the pipe to be conveyed in a rotational manner, causing the pipe to pass through the heating unit. The temperature of the heating unit is adjusted. After passing through the heating unit, the surface of the pipe will heat up, making it easier for the surface of the pipe to deform. The pipe after the temperature rise enters the rolling device internally in a rotational manner, and the pressing knife in the rolling device rolls the side wall of the pipe into corrugations. By heating the pipe and then rolling the corrugations, the difficulty of forming corrugations on the surface of the pipe is reduced, the corrugation forming efficiency is improved, and after forming, it is cooled, with high cooling efficiency and stable corrugation shape. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0030] Figure 1 It is a schematic flowchart of the forming method of the present invention; DETAILED DESCRIPTION OF THE EMBODIMENTS

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0032] A method for forming a corrugated HVAC pipe, as Figure 1 shown, the forming method includes the following steps:

[0033] S1. Feeding

[0034] Select a suitable pipe, insert the pipe into the feed port of the forming device, and support the pipe during the feeding process.

[0035] S2. Conveying

[0036] The pipe enters the inside of the conveying unit through the feed port. The conveying unit clamps and rolls the side wall of the pipe, and drives the pipe to be conveyed in a rotational manner through the friction between the side wall of the pipe and the conveying unit.

[0037] S3. Heating

[0038] The pipe conveyed by the conveying unit passes through the heating unit, and the heating unit heats the side wall of the pipe, making the side wall of the pipe easier to deform.

[0039] S4. Rolling

[0040] The heated pipe is transported into the rolling unit. A pressing tool is arranged inside the rolling unit. As the pipe is transported in a rotational manner, the pressing tool presses corrugations on the side wall of the pipe.

[0041] S5. Cooling

[0042] The pipe after roll forming passes through the cooling unit. The cooling unit cools down the pipe wall to stabilize the corrugations formed on the side wall of the pipe.

[0043] S6. Discharging

[0044] The cooled pipe is discharged through the discharge port. The discharge port supports and guides the pipe to prevent one end of the pipe from sagging due to its weight or the pipe from tilting.

[0045] The axes of the discharge port, the conveying unit, the heating unit, the rolling unit, the cooling unit, and the blanking port are on the same straight line. The pipe can be inserted from the discharge port and sequentially enter the conveying unit, the heating unit, the rolling unit, and the cooling unit, and finally be discharged through the blanking port, which is convenient for the transportation and processing of the pipe. The distances between the discharge port, the conveying unit, the heating unit, the rolling unit, the cooling unit, and the blanking port are adjustable and can be adjusted according to the length of the pipe to facilitate the processing of corrugations on pipes of various lengths.

[0046] The diameter size of the pipe is one of 9mm, 12mm, and 19mm.

[0047] These three pipe diameters can all be used, and the sizes are more convenient for processing and use.

[0048] The rolling unit is provided with three pressing tools, and the three pressing tools process the side wall of the pipe simultaneously, and the number of pressing tools is adjustable.

[0049] When the pipe is transported in a rotational manner, the three pressing tools roll press the pipe simultaneously to form three circles of corrugations at the same time. Each circle of corrugations is in the shape of a spring thread, with high processing efficiency. The corrugation spacing on the side wall of the processed corrugated HVAC pipe is the same. When different numbers of corrugations need to be processed on the corrugated HVAC pipe, the number of pressing tools can be changed to process different numbers of circles of corrugations.

[0050] The distance between adjacent pressing tools is set to 5mm, the feed depth of the pressing tool is 0.5 - 2mm, the feed angle of the pressing tool is 0 - 35 degrees, and the corrugation pressing speed of the pressing tool is 10 - 50 revolutions per second.

[0051] The forming depth of the corrugation is 0.5 - 2mm, the feed angle is controlled at 0 - 35 degrees, and the pipe rotates 10 - 50 revolutions per second, so that the pressing tool can press 10 - 50 revolutions per second, which is equivalent to 10 - 50 circles.

[0052] The internal temperature of the heating unit is set to 800 - 1000 °C.

[0053] 800 - 1000 °C will not cause the pipe material to melt, but it will affect its deformation ability, making the embossing deformation of the pipe material simple.

[0054] The cooling method adopted by the cooling unit is at least one of air cooling, water cooling, and liquid nitrogen cooling. The cooling unit cools the pipe material to 800 - 970 °C.

[0055] Air cooling, water cooling, and liquid nitrogen cooling can all cool the pipe material, and the cooling speed is relatively fast. Compared with natural air cooling, the cooling efficiency is high. It can cool the pipe material to 850 - 970 degrees, making the surface temperature of the corrugated HVAC pipe drop to 0 - 30 degrees, and making the surface shape of the corrugated HVAC pipe stable.

[0056] A ranging and speed - measuring sensor is provided at one end of the conveying unit. The ranging and speed - measuring sensor is used to detect the feeding speed and feeding length of the pipe material.

[0057] The ranging and speed - measuring sensor is a prior art. The model can be Kl800. By detecting the feeding length of the pipe material, the corrugation processing length can be judged.

[0058] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above - mentioned embodiments. The above - mentioned embodiments and the descriptions in the specification only illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed.

Claims

1. A forming method for corrugated HVAC pipes, characterized in that, The forming method includes the following steps: S1. Loading Select a suitable pipe, insert the pipe into the feed inlet of the forming device, and support and guide the pipe during the loading process; S2. Conveying The pipe enters the interior of the conveying unit through the feed inlet. The conveying unit clamps and rolls the side wall of the pipe, and drives the pipe to rotate and convey through the friction between the side wall of the pipe and the conveying unit; S3. Heating The pipe conveyed by the conveying unit passes through the heating unit, and the heating unit heats the side wall of the pipe to make the side wall of the pipe easy to deform; S4. Rolling The heated pipe is conveyed into the rolling unit. A pressing knife is arranged inside the rolling unit. As the pipe rotates and conveys, the pressing knife presses corrugations on the side wall of the pipe; S5. Cooling The pipe after roll forming passes through the cooling unit, and the cooling unit cools down the pipe wall to make the corrugations on the side wall of the pipe stable; S6. Unloading The cooled pipe is unloaded through the discharge port. The discharge port supports and guides the pipe to prevent one end of the pipe from sagging due to weight or the pipe from tilting.

2. The method for forming a corrugated HVAC pipe according to claim 1, characterized in that, The axes of the discharge port, the conveying unit, the heating unit, the rolling unit, the cooling unit, and the blanking port are on the same straight line, and the distances between the discharge port, the conveying unit, the heating unit, the rolling unit, the cooling unit, and the blanking port are adjustable.

3. A corrugated HVAC pipe forming method according to claim 1, wherein, The diameter size of the pipe is one of 9mm, 12mm, and 19mm.

4. A corrugated HVAC pipe forming method according to claim 3, characterized in that, The rolling unit is provided with three groups of pressing knives, and the three groups of pressing knives process the side wall of the pipe at the same time, and the number of pressing knives is adjustable.

5. A corrugated HVAC pipe forming method according to claim 4, characterized in that The distance between adjacent pressing knives is set to 5mm, the feed depth of the pressing knife is 0.5 - 2mm, the feed angle of the pressing knife is 0 - 35 degrees, and the corrugating speed of the pressing knife is 10 - 50 revolutions per second.

6. A method for forming a corrugated HVAC pipe according to claim 1, characterized in that, The internal temperature of the heating unit is set to 800 - 1000°C.

7. A corrugated HVAC pipe forming method according to claim 1, characterized in that, The cooling method adopted by the cooling unit is at least one of air cooling, water cooling, and liquid nitrogen cooling, and the cooling unit cools the pipe by 800 - 970°C.

8. A method for forming a corrugated HVAC pipe according to claim 1, characterized in that, A distance measuring and speed measuring sensor is arranged at one end of the conveying unit, and the distance measuring and testing sensor is used to detect the feeding speed and feeding length of the pipe.

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