Corner heating equipment

Abstract

The utility model provides corner heating equipment, which belongs to the technical field of medium-high frequency heating and comprises two induction units, the two induction units are sequentially arranged at intervals along the axis direction of a metal pipe fitting and respectively abut against the same corner structure of the metal pipe fitting, and the two induction units and the corner structure form contact surfaces respectively. The two induction units are electrically connected with the power source positive electrode and the power source negative electrode correspondingly and used for forming medium-high frequency induction current on the corner structure between the two contact surfaces, so that the corner structure forms a red hot high-temperature area. According to the corner heating equipment provided by the utility model, the two induction units are respectively connected with a positive power supply and a negative power supply, and a medium-high frequency induction current can be formed on the corner structure between the two contact surfaces, so that the corner structure forms a red hot high-temperature area, and the subsequent mechanical shaping of the corner structure is facilitated; operation is convenient, efficiency is high, and energy conservation and environmental protection are achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of medium and high frequency heating, and more specifically relates to a corner heating device. Background Art

[0002] The bending area of ​​the metal pipe is its corner structure. The corner structure will stretch and deform when bent, which results in the thickness of the corner structure being usually smaller than the wall thickness of the metal pipe. For example, for a metal pipe with a wall thickness of 10 mm, the thickness of its corner structure is usually around 9.5 mm. In other words, the thickness of the corner structure of the metal pipe is the thinnest area of ​​the entire metal pipe, which affects the service life of the metal pipe. Therefore, in order to ensure that the thickness of each area of ​​the metal pipe is consistent, it is necessary to heat the corner after the metal pipe is formed. This can not only eliminate the internal stress of the corner structure, but also mechanically shape the corner structure in the heated state so that its thickness is consistent with or greater than the wall thickness of the metal pipe, thereby ensuring the service life of the metal pipe.

[0003] In the prior art, the corners of metal pipes are usually heated by overall heating or local spray gun baking. The above two methods not only waste energy, but also are very inconvenient to operate, seriously affecting production efficiency. Utility Model Content

[0004] The purpose of the utility model is to provide a corner heating device, aiming to solve the problem that heating the corner structure of a metal pipe by overall heating or local spray gun baking not only leads to energy waste, but also is very inconvenient to operate, seriously affecting production efficiency.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: to provide a corner heating device, including two induction units, the two induction units are arranged in sequence along the axial direction of the metal pipe and respectively abut against the same corner structure of the metal pipe, the two induction units respectively form contact surfaces with the corner structure, the two induction units are respectively electrically connected to the positive electrode and the negative electrode of the power supply to form a medium-high frequency induced current in the corner structure between the two contact surfaces, so that the corner structure forms a red-hot high-temperature zone.

[0006] In a possible implementation, the sensing unit is a metal wheel, which is tilted along a diagonal direction of the metal pipe, and an outer peripheral surface of the metal wheel abuts against a corner structure of the metal pipe to form the contact surface.

[0007] In a possible implementation, the metal wheel is located outside the metal pipe, and the outer peripheral surface of the metal wheel has an inner concave arc surface, and the inner concave arc surface abuts against the outer side of the corner structure.

[0008] In a possible implementation, arc surfaces are respectively provided on both sides of the outer peripheral surface of the metal wheel in the thickness direction, and the two arc surfaces are respectively located on both sides of the concave arc surface.

[0009] In a possible implementation, the curvature of the inner concave curved surface is not greater than the outer curvature of the corresponding corner structure.

[0010] In a possible implementation, the metal wheel is located inside the metal pipe, and the outer peripheral surface of the metal wheel has an outer convex arc surface, and the outer convex arc surface abuts against the inner side of the corner structure.

[0011] In a possible implementation, the curvature of the outer convex curved surface is not less than the inner curvature of the corresponding corner structure.

[0012] In a possible implementation, the corner heating device further includes an elastic member, wherein the elastic member connects the two induction units, and the elastic member provides an elastic force for pressing the induction units against the corner structure of the metal pipe.

[0013] In a possible implementation, the corner heating device further includes a transmission mechanism, the metal pipe is placed on the transmission mechanism, and the transmission mechanism is used to transport the metal pipe to move along its length direction.

[0014] The beneficial effect of a metal pipe corner heating device provided by the utility model is that: compared with the prior art, two induction units are arranged in sequence along the axial direction of the metal pipe and respectively abut against the same corner structure. The two induction units form contact surfaces with the corner structure respectively. The two induction units are respectively connected to the positive pole and the negative pole of the power supply, so that a medium-high frequency induced current is formed at the corner structure position between the two contact surfaces. Under the skin effect of the induced current, the medium-high frequency current will form an eddy electric field between the positive and negative contact surfaces, so that the temperature of the corner structure area between the two contact surfaces gradually increases, forming a red-hot high-temperature zone. The corner heating device provided by the utility model utilizes two induction units to respectively connect the positive and negative poles of the power supply, which can form a medium-high frequency induced current at the corner structure between the two contact surfaces, so that the corner structure forms a red-hot high-temperature zone, which is convenient for the subsequent mechanical shaping of the corner structure. It is not only convenient to operate and efficient, but also more energy-saving and environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 creative work.

[0016] Figure 1 A diagram showing the use status of the corner heating device provided by the utility model;

[0017] Figure 2 A side view of the corner heating device in use according to the first embodiment of the utility model;

[0018] Figure 3 A side view of the corner heating device in use according to the second embodiment of the utility model.

[0019] Description of reference numerals:

[0020] 100, metal wheel; 110, inner concave arc surface; 120, circular arc surface; 130, outer convex arc surface; 200, fixing plate; 210, elastic member; 220, mounting frame; 300, transmission roller; 400, metal pipe fitting; 410, corner structure. DETAILED DESCRIPTION

[0021] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0022] In the claims, specification and the above-mentioned drawings of the utility model, unless otherwise clearly defined, the use of terms such as "first", "second" or "third" etc. is to distinguish different objects rather than to describe a specific order.

[0023] In the claims, specification and the above-mentioned drawings of the utility model, unless otherwise explicitly defined, directional words, such as the terms "center", "lateral", "longitudinal", "horizontal", "vertical", "top", "bottom", "inside", "outside", "up", "down", "front", "back", "left", "right", "clockwise", "counterclockwise", "high", "low", etc., indicating directions or positional relationships are based on the directions and positional relationships shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the specific protection scope of the utility model.

[0024] See also Figure 1Now, a corner heating device provided by the utility model is described. A corner heating device includes two induction units, which are arranged in sequence along the axial direction of the metal pipe 400 and respectively abut against the same corner structure 410 of the metal pipe 400, and the two induction units respectively form contact surfaces with the corner structure 410, and the two induction units are respectively electrically connected to the positive electrode and the negative electrode of the power supply to form a medium-high frequency induction current in the corner structure 410 between the two contact surfaces, so that the corner structure 410 forms a red-hot high-temperature zone.

[0025] The utility model provides a corner heating device. Compared with the prior art, two induction units are sequentially arranged along the axial direction of the metal pipe 400 and respectively abut against the same corner structure 410. The two induction units form contact surfaces with the corner structure 410 respectively. The two induction units are respectively connected to the positive pole and the negative pole of the power supply, so that a medium-high frequency induced current is formed at the position of the corner structure 410 between the two contact surfaces. Under the skin effect of the induced current, the medium-high frequency current will form an eddy electric field between the positive and negative contact surfaces, so that the temperature of the corner structure 410 area between the two contact surfaces gradually increases, forming a red-hot high-temperature zone. The utility model provides a corner heating device. By connecting the two induction units to the positive and negative poles of the power supply respectively, a medium-high frequency induced current can be formed at the corner structure 410 between the two contact surfaces, so that the corner structure 410 forms a red-hot high-temperature zone, which is convenient for the subsequent mechanical shaping of the corner structure 410. It is not only convenient to operate and efficient, but also more energy-saving and environmentally friendly.

[0026] In addition, by heating the corner structure 410 of the metal pipe 400, etc., the internal stress of the corner structure 410 of the metal pipe 400 can be eliminated, thereby achieving the effect of refining the grains of the corner structure 410 by heat treatment.

[0027] It is worth noting that the metal pipe 400 mentioned in the present application is a ferromagnetic metal material, such as iron, cobalt, nickel and alloy metal materials thereof. The metal pipe 400 refers to a polygonal pipe, such as a triangular pipe, a rectangular pipe (square pipe) or a polygonal pipe (a pipe with more than four sides).

[0028] Skin effect (also known as skin effect or literally translated as epidermal effect, English: Skin effect) refers to the phenomenon that the current distribution inside the conductor is uneven when there is alternating current or alternating electromagnetic field in the conductor. As the distance from the surface of the conductor gradually increases, the current density in the conductor decreases exponentially, that is, the current in the conductor will be concentrated on the surface of the conductor. From the cross-section perpendicular to the direction of the current, there is almost no current flowing through the center of the conductor, and there is current only on the edge of the conductor. Simply put, the current is concentrated in the "skin" part of the conductor, so it is called the skin effect. The main reason for this effect is that the changing electromagnetic field generates a vortex electric field inside the conductor, which offsets the original current.

[0029] The medium and high frequency current will form an eddy electric field in the area between the positive and negative contact points, so that the temperature of the area between the two contact points gradually increases, thereby forming a heating area to heat the corner structure 410. The metal material can be in a fixed state, when the corner structure 410 is heated for a period of time, the heating is stopped, and the corner structure 410 cools down naturally; or the metal material is in a continuous operation state, and as the corner structure 410 of the metal material moves, the corner structure 410 is heated in sequence along the length direction, and the heated corner structure 410 cools down naturally.

[0030] The sensing unit is a metal wheel 100 , which is tilted along the diagonal direction of the metal pipe 400 , and the outer peripheral surface of the metal wheel 100 abuts against the corner structure 410 of the metal pipe 400 to form a contact surface.

[0031] See also Figure 2 In the first embodiment, the metal wheel 100 is located outside the metal pipe 400, and the outer peripheral surface of the metal wheel 100 has an inner concave arc surface 110, which abuts against the outer side of the corner structure 410. Heat is first generated outside the corner structure 410, and finally the heat extends to the inner side of the corner structure 410, so that the area where the corner structure 410 is located forms a red-hot high-temperature zone.

[0032] Among them, the first embodiment is usually applied to metal pipes 400 with smaller diameters. Generally, the inner diameter of the metal pipes 400 is less than 200 mm, and an external metal wheel 100 is used in this case. Arc surfaces 120 are respectively provided on both sides of the thickness direction of the outer peripheral surface of the metal wheel 100, and the two arc surfaces 120 are respectively located on both sides of the inner concave arc surface 110, so as to avoid forming sharp corners on the outer side of the metal wheel 100, ensure the structural strength of the metal wheel 100 itself, and prevent the outer side of the metal wheel 100 from scratching the relevant operators.

[0033] Preferably, the curvature of the inner concave curved surface 110 is not greater than the outer curvature of the corresponding corner structure 410, that is, the curvature of the inner concave curved surface 110 is more gentle than the outer curvature of the corner structure 410. When the curvature of the inner concave curved surface 110 is the same as the outer curvature of the corner structure 410, the inner concave curved surface 110 is completely fitted with the outer curvature of the corner structure 410; when the curvature of the inner concave curved surface 110 is less than the outer curvature of the corner structure 410, the middle of the inner concave curved surface 110 is fitted with the outer curvature of the corner structure 410 and is surrounded by the outer side of the corner structure 410.

[0034] See also Figure 3In the second embodiment, the metal wheel 100 is located inside the metal pipe 400, and the outer peripheral surface of the metal wheel 100 has an outer convex arc surface 130, which abuts against the inner side of the corner structure 410. Heat is first generated inside the corner structure 410, and finally the heat extends to the outer side of the corner structure 410, so that the area where the corner structure 410 is located forms a red-hot high-temperature zone.

[0035] The second implementation is usually applied to metal pipes 400 with larger diameters. Generally, the inner diameter of the metal pipe 400 is greater than or equal to 200 mm. In this case, the built-in metal wheel 100 is used to reduce the space occupancy rate. When the second implementation is used, the metal pipe 400 is usually in a fixed state rather than a continuous state. The built-in multiple hydraulic mechanisms are used to support and fix the metal pipe 400 from different angles without affecting the installation space of the built-in metal wheel 100, and the fixed metal pipe 400 is processed.

[0036] Preferably, the curvature of the outer convex curved surface 130 is not less than the inner curvature of the corresponding corner structure 410. When the curvature of the outer convex curved surface 130 is the same as the inner curvature of the corner structure 410, the outer convex curved surface 130 is completely fitted with the inner curvature of the corner structure 410; when the curvature of the outer convex curved surface 130 is greater than the outer curvature of the corner structure 410, the middle of the outer convex curved surface 130 is fitted with the inner curvature of the corner structure 410, and the inner curvature is surrounded by the outer side of the corner structure 410.

[0037] See also Figure 3 The corner heating device further includes an elastic member 210 , which connects the two induction units and provides an elastic force for pressing the induction units against the corner structure 410 of the metal pipe 400 .

[0038] Specifically, the metal wheel 100 is mounted on a mounting frame 220 of a U-shaped structure, and the mounting frame 220 is connected to the fixing plate 200 through an elastic member 210. The fixing plate 200 is located outside the metal pipe 400, a connecting column is fixed inside the fixing plate 200, a connecting sleeve is provided outside the mounting frame 220, and the connecting column is inserted into the connecting sleeve, and the elastic member 210 is a spring, which is located in the connecting sleeve and sleeved on the connecting column, and a retaining ring is provided around the connecting column, which compresses the spring to put it in a compressed state, and the compressed spring pushes the mounting frame 220, so that the metal wheel 100 always rests against the corner structure 410.

[0039] See also Figure 1The corner heating device also includes a transmission mechanism, on which the metal pipe 400 is placed, and the transmission mechanism is used to transport the metal pipe 400 along its length direction. The transmission mechanism includes a plurality of transmission rollers 300, which are arranged in sequence and spaced along the length direction of the metal pipe 400. The transmission rollers 300 rotate to drive the metal pipe 400 to be transported axially. The two metal wheels 100 can continuously heat the corner structure 410 of the moving metal pipe 400, and directly transport the heated metal pipe 400 to the subsequent shaping process for mechanical shaping, thereby realizing continuous production.

[0040] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A corner heating device, characterized in that: The invention comprises two induction units, the two induction units are arranged in sequence at intervals along the axial direction of the metal pipe (400) and respectively abut against the same corner structure (410) of the metal pipe (400), the two induction units respectively form contact surfaces with the corner structure (410), and the two induction units are respectively electrically connected to the positive electrode and the negative electrode of the power supply to form a medium-high frequency induction current in the corner structure (410) between the two contact surfaces, so that the corner structure (410) forms a red-hot high-temperature zone.

2. A corner heating device as claimed in claim 1, characterized in that: The sensing unit is a metal wheel (100), the metal wheel (100) is arranged obliquely along the diagonal direction of the metal pipe (400), and the outer peripheral surface of the metal wheel (100) is pressed against the corner structure (410) of the metal pipe (400) to form the contact surface.

3. A corner heating device as claimed in claim 2, characterized in that: The metal wheel (100) is located outside the metal pipe (400), and the outer peripheral surface of the metal wheel (100) is provided with an inner concave arc surface (110), and the inner concave arc surface (110) is against the outer side of the corner structure (410).

4. A corner heating device as claimed in claim 3, characterized in that: Arc surfaces (120) are respectively provided on both sides of the outer peripheral surface of the metal wheel (100) in the thickness direction, and the two arc surfaces (120) are respectively located on both sides of the inner concave arc surface (110).

5. A corner heating device as claimed in claim 3, characterized in that: The curvature of the inner concave curved surface (110) is not greater than the outer curvature of the corresponding corner structure (410).

6. A corner heating device as claimed in claim 2, characterized in that: The metal wheel (100) is located inside the metal pipe (400), and the outer peripheral surface of the metal wheel (100) is provided with an outer convex arc surface (130), and the outer convex arc surface (130) is against the inner side of the corner structure (410).

7. A corner heating device as claimed in claim 6, characterized in that: The curvature of the outer convex curved surface (130) is not less than the inner curvature of the corresponding corner structure (410).

8. A corner heating device according to any one of claims 1 to 7, characterized in that: The corner heating device further comprises an elastic member (210), wherein the elastic member (210) connects the two induction units, and the elastic member (210) provides an elastic force for pressing the induction units against the corner structure (410) of the metal pipe (400).

9. A corner heating device according to any one of claims 1 to 7, characterized in that: The corner heating device also includes a transmission mechanism, on which the metal pipe (400) is placed, and the transmission mechanism is used to transport the metal pipe (400) to move along its length direction.

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