Thin-wall copper and aluminum pipe hot-bending device

Abstract

According to the thin-wall copper and aluminum pipe hot-bending device, the electric drying oven is fixed to the outer side of the middle of the pipe conveying rail, and the manual hot-bending mechanisms are symmetrically arranged on the two sides of the rear portion of the electric drying oven, so that heated pipes can be immediately moved to a bending station, and secondary heating caused by temperature loss is avoided; the pipe fitting conveying track adopts a conveying roller structure driven by a double-track ball and a meshing gear, and is matched with a positioning shaft hole in the surface of the platform, so that the axial non-offset movement of the pipe fitting is ensured, and the bending position is accurately aligned with a heating area and a bending mechanism; a temperature-time prediction model arranged in the control box dynamically calculates the optimal heating temperature and time based on the melting point, the plasticity coefficient, the heat conductivity coefficient and other characteristics of the pipe and the target bending angle, and the defect of overheating or insufficient heating in the traditional technology is fundamentally overcome. The manual bending mechanism drives the bending head with the arc-shaped groove through the screw and the hand wheel, an operator only needs to slightly rotate the hand wheel to complete bending machining, and therefore integration and intellectualization of bending machining of the thin-walled pipe are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of machining, in particular to a device for hot-simmering thin-walled copper or aluminum tubes. Background Art

[0002] Thin-walled copper and aluminum tubes are widely used in refrigeration, aerospace, automotive manufacturing, and other fields due to their excellent thermal conductivity, ductility, and lightweight properties. During piping system installation, pipes often need to be bent at specific angles (i.e., bent).

[0003] Traditional bending processes mainly rely on two types of technologies: one is cold bending, which uses mechanical force to force the bending of pipes, but thin-walled pipes are prone to wrinkling, flattening, or even cracking during cold bending, especially for soft metals such as copper and aluminum, where the pass rate is low; the other is hot bending, which uses flame or resistance wire to locally heat and soften the pipe before bending. Although this can reduce the risk of deformation, it has problems such as low temperature control accuracy and uneven heating area.

[0004] Existing technologies achieve continuous feeding, but the heating unit is separated from the bending unit, requiring multiple clamping and positioning, resulting in low processing efficiency and easy introduction of errors; some technologies have improved the heating speed, but due to the lack of an accurate temperature-time matching model, overheating often causes the grain coarsening or strength reduction of the material.

[0005] In addition, the following drawbacks are common in equipment available on the market: 1) Manual feeding and positioning rely on the operator's experience, and the residence time of the pipe in the high-temperature zone is difficult to accurately control; 2) The distance between the bending mechanism and the heating station is too large, and the temperature of the pipe drops sharply during transportation, requiring secondary heating; 3) There is a lack of adaptive temperature control strategies for different materials and wall thicknesses, resulting in poor versatility of process parameters.

[0006] Therefore, how to achieve high-precision positioning and transportation of thin-walled tubes, dynamic matching of heating temperature and time, and rapid bending and integrated processing of hot tubes has become a technical problem that urgently needs to be broken through in this field. Summary of the Invention

[0007] The purpose of the present invention is to provide a thin-walled copper and aluminum tube hot-braising device to solve the problems existing in the above-mentioned prior art.

[0008] To achieve the above object, the present invention provides the following solutions:

[0009] The present invention provides a thin-wall copper and aluminum tube hot simmering device, comprising:

[0010] A processing platform, wherein a pipe conveying track is provided in the middle of the processing platform;

[0011] An electric oven, the electric oven being fixed on the processing platform and located outside the middle of the pipe conveying track;

[0012] A manual bending mechanism, which is arranged on both sides of the processing platform and located behind the electric oven;

[0013] A control box is arranged on the side of the processing platform and establishes communication with the pipe conveying track and the electric oven.

[0014] Preferably, universal wheels are provided at the bottom of the processing platform.

[0015] Preferably, a positioning shaft hole is opened on the surface of the processing platform, the positioning shaft hole is located between the manual bending mechanisms, and a positioning shaft is detachably inserted therein.

[0016] Preferably, the pipe conveying track includes a first side rail and a second side rail, and balls are rotatably provided in the first side rail and the second side rail. The ends of the first side rail and the second side rail are respectively rotatably provided with a first conveying roller and a second conveying roller, a first gear is fixed on the upper part of the first conveying roller, and a second gear is fixed on the upper part of the second conveying roller, the first gear is meshed with the second gear, and the first conveying roller is connected to the conveying motor.

[0017] Preferably, the first conveying roller and the second conveying roller each include a rotating shaft, the rotating shaft is rotatably disposed on the processing platform via a bearing, and a friction roller is fixed to the outer side of the rotating shaft.

[0018] Preferably, the bottom of the rotating shaft of the first conveying roller is connected to the output shaft of the reducer through a first coupling, and the power output shaft of the conveying motor is connected to the input shaft of the reducer through a second coupling.

[0019] Preferably, the manual bending mechanism includes an arc-shaped bending head, the outer side of the arc-shaped bending head is rotatably connected to one end of the screw, the middle part of the screw is limited in the fixing nut, the fixing nut is fixed to the side of the processing platform, and the other end of the screw is provided with a handwheel.

[0020] Preferably, an arc-shaped groove is provided on the side of the arc-shaped elbow.

[0021] The present invention also provides a method for using a thin-walled copper or aluminum tube heating device, comprising the following steps:

[0022] S1. The pipe to be processed is loaded between the first and second conveyor rollers, and the conveyor motor is started by the control box. The pipe to be processed is transported in the pipe conveyor track and the bending position is entered into the electric oven;

[0023] S2. Input the material, thickness and bending angle of the pipe to be processed into the control box. The control box calculates the heating temperature and heating time through the built-in heating algorithm and generates control instructions based on the calculation results to control the electric oven to heat the bending position of the pipe to be processed;

[0024] S3. After heating is completed, the conveying motor is started again through the control box, so that the bending position enters between the manual bending mechanisms, and the arc bending head applies external force to the bending position by turning the hand wheel to complete the bending process.

[0025] Preferably, in step S2, the specific method for the control box to calculate the heating temperature and heating time using the built-in heating algorithm is:

[0026] S21. Build a basic database;

[0027] S22. Perform feature engineering on the data in the database;

[0028] S23. Constructing a temperature-time prediction model;

[0029] S24. Material feature extraction, obtain the thickness of the pipe to be processed, the bending angle θ, and obtain the melting point temperature T of the pipe to be processed based on the material of the pipe to be processed melt , material plasticity coefficient K, thermal conductivity λ, thermal expansion coefficient α and yield strength σ s ;

[0030] S25. Calculate the heat penetration time using the temperature-time prediction model. The calculation formula is:

[0031] t penetration =(thickness 2 ) / (4*α*λ)*1000;

[0032] S26. Calculate the bending energy using the temperature-time prediction model. The calculation formula is:

[0033] Q req =K×σ s ×θ×(thickness) 1.8 ;

[0034] S27. Calculate the heating temperature using the temperature-time prediction model. The calculation formula is:

[0035] T target =0.65×T melt +35×ln(thickness);

[0036] S28. Calculate the heating time using the temperature-time prediction model. The calculation formula is:

[0037] t heating =Q req / (P heater ×η)+0.4×t penetration ;

[0038] Among them, P heater is the rated heating power of the electric oven, and η is the thermal efficiency coefficient.

[0039] Compared with the prior art, the present invention has achieved the following beneficial technical effects:

[0040] The present invention provides a thin-walled copper and aluminum tube hot bending device, which fixes an electric oven on the outer side of the middle part of the pipe conveying track, and symmetrically arranges manual bending mechanisms on both sides behind it, so that the heated pipe can be immediately moved to the bending station to avoid secondary heating caused by temperature loss; the pipe conveying track adopts a conveying roller structure driven by double-track balls and meshing gears, and cooperates with the positioning shaft hole on the platform surface to ensure that the pipe moves axially without offset, so that the bending position is accurately aligned with the heating zone and the bending mechanism; the temperature-time prediction model built into the control box dynamically calculates the optimal heating temperature and time based on the melting point, plasticity coefficient, thermal conductivity and other characteristics of the pipe and the target bending angle, fundamentally solving the defects of overheating or insufficient heating in traditional processes; the manual bending mechanism drives the bending head with an arc groove through a screw-handwheel, and the operator only needs to lightly turn the handwheel to complete the bending process, thereby realizing the integration and intelligence of thin-walled pipe bending processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0042] Figure 1 This is a front view of the thin-walled copper and aluminum tube heating device provided by the present invention;

[0043] Figure 2 A top view of the thin-walled copper and aluminum tube simmering device provided by the present invention;

[0044] Figure 3 This is a schematic diagram of the conveying roller structure in the thin-walled copper and aluminum tube hot simmering device provided by the present invention. DETAILED DESCRIPTION

[0045] The serial numbers of components in this document, such as "first", "second", etc., are only used to distinguish the described objects, and do not have any sequence or technical meaning. Unless otherwise specified, the "connection" and "coupling" in this application include direct and indirect connection (coupling). In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0046] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0047] The technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0048] The purpose of the present application is to provide a thin-walled copper and aluminum pipe hot bending device to solve the problems existing in the prior art.

[0049] In order to make the above-mentioned purposes, characteristics and advantages of the present application more obvious and easy to understand, the present application will be further described in detail in combination with the drawings and specific embodiments.

[0050] Embodiment 1:

[0051] The embodiment provides a thin-walled copper and aluminum pipe hot bending device, as shown in Figure 1 and 2 , comprising:

[0052] A machining platform 1, which can be a cast iron platform, has a pipe conveying track 2 in the middle, mainly for conveying pipes;

[0053] The electric oven 3 is fixed on the processing platform 1 and is located outside the middle of the pipe conveying track 2. It can be an existing electric oven, which can be induction heating or radiation heating. The electric oven is fixed outside the middle of the pipe conveying track, and manual bending mechanisms are symmetrically arranged on both sides behind it, so that the heated pipes can be immediately transferred to the bending station to avoid secondary heating caused by temperature loss.

[0054] Manual bending mechanism 4, which is arranged on both sides of the processing platform 1 and located behind the electric oven 3, is mainly used for manually bending the pipe fittings;

[0055] The control box 5 is arranged on the side of the processing platform 1 and establishes communication with the pipe conveying track 2 and the electric oven 3 for overall control.

[0056] As an embodiment, universal wheels are provided at the bottom of the processing platform 1 to facilitate mobile deployment.

[0057] As an embodiment, a positioning shaft hole 11 is opened on the surface of the processing platform 1. The positioning shaft hole 11 is located between the manual bending mechanism 4, and a positioning shaft 12 is detachably inserted to facilitate positioning of the pipe.

[0058] As an embodiment, the pipe conveying track 2 includes a first side rail 21 and a second side rail 22. Balls are rotatably provided in the first side rail 21 and the second side rail 22 to ensure that the pipe moves axially without deviation, so that the bending position is accurately aligned with the heating zone and the bending mechanism. The ends of the first side rail 21 and the second side rail 22 are respectively rotatably provided with a first conveying roller 23 and a second conveying roller 24. A first gear 25 is fixed to the upper part of the first conveying roller 23, and a second gear 26 is fixed to the upper part of the second conveying roller 24. The first gear 25 is meshed with the second gear 26. The first conveying roller 23 is connected to the conveying motor 27, and the first conveying roller 23 is driven to rotate by the conveying motor 27, thereby realizing the rotation of the second conveying roller 24. The pipe can be conveyed forward by the relative rotation of the first conveying roller 23 and the second conveying roller 24.

[0059] As an implementation method, Figure 3 As shown, the first conveyor roller 23 and the second conveyor roller 24 both include a rotating shaft 231, which is rotatably arranged on the processing platform 1 through a bearing 232. A friction roller 233 is fixed to the outside of the rotating shaft 231. The friction roller 233 can be a plastic roller with a frosted surface to ensure sufficient friction.

[0060] As an embodiment, the bottom of the rotating shaft 231 of the first conveying roller 23 is connected to the output shaft of the reducer 28 through the first coupling 234, and the power output shaft of the conveying motor 27 is connected to the input shaft of the reducer 28 through the second coupling 235, thereby realizing power output.

[0061] As an embodiment, the manual bending mechanism 4 includes an arc-shaped bending head 41, the outer side of the arc-shaped bending head 41 is rotatably connected to one end of the screw 42, which can be specifically achieved through a bearing. The middle part of the screw 42 is limited in the fixed nut 43, and the fixed nut 43 is fixed to the side of the processing platform 1. The other end of the screw 42 is provided with a handwheel 44. By turning the handwheel 44, the screw 42 can be extended and retracted, thereby driving the arc-shaped bending head 41 to perform a bending operation. The operator only needs to lightly turn the handwheel to apply force to the softened pipe, which greatly reduces labor intensity and avoids wall thickness damage caused by mechanical strong bending.

[0062] As an embodiment, the side of the arc-shaped elbow 41 is provided with an arc-shaped groove so as to adapt to the pipe fitting.

[0063] Example 2:

[0064] This embodiment also provides a method for using a thin-walled copper or aluminum tube heating device, comprising the following steps:

[0065] S1. The pipe to be processed is loaded between the first and second conveyor rollers, and the conveyor motor is started by the control box. The pipe to be processed is transported in the pipe conveyor track and the bending position is entered into the electric oven;

[0066] S2. Input the material, thickness, and bending angle of the pipe to be processed into the control box. The control box calculates the heating temperature and heating time using a built-in heating algorithm and generates control instructions based on the calculation results to control the electric oven to heat the bending position of the pipe to be processed. The specific method is as follows:

[0067] S21. Build a basic database;

[0068] S22. Perform feature engineering on the data in the database;

[0069] S23. Constructing a temperature-time prediction model;

[0070] S24. Material feature extraction, obtain the thickness of the pipe to be processed, the bending angle θ, and obtain the melting point temperature T of the pipe to be processed based on the material of the pipe to be processed melt , material plasticity coefficient K, thermal conductivity λ, thermal expansion coefficient α and yield strength σ s ;

[0071] S25. Calculate the heat penetration time using the temperature-time prediction model. The calculation formula is:

[0072] t penetration =(thickness 2 ) / (4*α*λ)*1000;

[0073] S26. Calculate the bending energy using the temperature-time prediction model. The calculation formula is:

[0074] Q req =K×σ s ×θ×(thickness) 1.8 ;

[0075] S27. Calculate the heating temperature using the temperature-time prediction model. The calculation formula is:

[0076] T target =0.65×T melt +35×ln(thickness);

[0077] S28. Calculate the heating time using the temperature-time prediction model. The calculation formula is:

[0078] t heating =Q req / (P heater ×η)+0.4×t penetration ;

[0079] Among them, P heater is the rated heating power of the electric oven, η is the thermal efficiency coefficient;

[0080] S3. After heating is completed, the conveying motor is started again through the control box, so that the bending position enters between the manual bending mechanisms, and the arc bending head applies external force to the bending position by turning the hand wheel to complete the bending process.

[0081] The temperature-time prediction model built into the control box dynamically calculates the optimal heating temperature and time based on the melting point, plasticity coefficient, thermal conductivity and other characteristics of the pipe and the target bending angle, fundamentally solving the defects of overheating or insufficient heating in traditional processes.

[0082] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0083] It should be noted that the components mentioned in the above embodiments are all universal standard parts or components known to those skilled in the art, and their structures and principles can be known to those skilled in the art through technical manuals or conventional experimental methods.

[0084] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be understood as limiting the present invention.

Claims

1. A thin-walled copper or aluminum tube simmering device, characterized by: include: A processing platform, wherein a pipe conveying track is provided in the middle of the processing platform; An electric oven, the electric oven being fixed on the processing platform and located outside the middle of the pipe conveying track; A manual bending mechanism, which is arranged on both sides of the processing platform and located behind the electric oven; A control box is arranged on the side of the processing platform and establishes communication with the pipe conveying track and the electric oven.

2. The thin-walled copper or aluminum tube heating device according to claim 1, characterized in that: Universal wheels are provided at the bottom of the processing platform.

3. The thin-walled copper or aluminum tube simmering device according to claim 1, characterized in that: A positioning shaft hole is opened on the surface of the processing platform. The positioning shaft hole is located between the manual bending mechanisms and is detachably inserted with a positioning shaft.

4. The thin-walled copper or aluminum tube heating device according to claim 1, characterized in that: The pipe conveying track includes a first side rail and a second side rail, and balls are rotatably provided in the first side rail and the second side rail. The ends of the first side rail and the second side rail are respectively rotatably provided with a first conveying roller and a second conveying roller, a first gear is fixed on the upper part of the first conveying roller, and a second gear is fixed on the upper part of the second conveying roller, the first gear is meshed with the second gear, and the first conveying roller is connected to the conveying motor.

5. The thin-walled copper or aluminum tube simmering device according to claim 4, characterized in that: The first conveying roller and the second conveying roller each include a rotating shaft, the rotating shaft is rotatably disposed on the processing platform via a bearing, and a friction roller is fixed to the outer side of the rotating shaft.

6. The thin-walled copper or aluminum tube simmering device according to claim 5, characterized in that: The bottom of the rotating shaft of the first conveying roller is connected to the output shaft of the reducer through a first coupling, and the power output shaft of the conveying motor is connected to the input shaft of the reducer through a second coupling.

7. The thin-walled copper or aluminum tube simmering device according to claim 1, characterized in that: The manual bending mechanism includes an arc-shaped bending head, the outer side of which is rotatably connected to one end of a screw rod, the middle part of the screw rod is confined in a fixing nut, the fixing nut is fixed to the side of the processing platform, and a hand wheel is provided at the other end of the screw rod.

8. The thin-walled copper or aluminum tube heating device according to claim 7, characterized in that: The side surface of the arc-shaped elbow is provided with an arc-shaped groove.

9. The method for using the thin-walled copper or aluminum tube heating device according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1. The pipe to be processed is loaded between the first and second conveyor rollers, and the conveyor motor is started by the control box. The pipe to be processed is transported in the pipe conveyor track and the bending position is entered into the electric oven; S2. Input the material, thickness and bending angle of the pipe to be processed into the control box. The control box calculates the heating temperature and heating time through the built-in heating algorithm and generates control instructions based on the calculation results to control the electric oven to heat the bending position of the pipe to be processed; S3. After heating is completed, the conveying motor is started again through the control box, so that the bending position enters between the manual bending mechanisms, and the arc bending head applies external force to the bending position by turning the hand wheel to complete the bending process.

10. The method for using the thin-walled copper or aluminum tube heating device according to claim 9, characterized in that: In step S2, the control box calculates the heating temperature and heating time using the built-in heating algorithm as follows: S21. Build a basic database; S22. Perform feature engineering on the data in the database; S23. Constructing a temperature-time prediction model; S24. Material feature extraction, obtain the thickness of the pipe to be processed, the bending angle θ, and obtain the melting point temperature T of the pipe to be processed based on the material of the pipe to be processed melt , material plasticity coefficient K, thermal conductivity λ, thermal expansion coefficient α and yield strength σ s ; S25. Calculate the heat penetration time using the temperature-time prediction model. The calculation formula is: t penetration =(thickness 2 ) / (4*α*λ)*1000; S26. Calculate the bending energy using the temperature-time prediction model. The calculation formula is: Q req =K×σ s ×θ×(thickness) 1.8 ; S27. Calculate the heating temperature using the temperature-time prediction model. The calculation formula is: T target =0.65×T melt +35×ln(thickness); S28. Calculate the heating time using the temperature-time prediction model. The calculation formula is: t heating =Q req / (P heater ×η)+0.4×t penetration ; Among them, P heater is the rated heating power of the electric oven, and η is the thermal efficiency coefficient.

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