Composite induction heating coil for pushing production of stainless steel elbows

Abstract

The utility model discloses a composite induction heating coil for pushing production of stainless steel elbows, which comprises a first heating coil and a second heating coil, the first heating coil and the second heating coil are sleeved on a die, the die comprises a die core rod and a die core bar, the first heating coil is sleeved on the die core rod, and the second heating coil is sleeved on the die core bar. The second heating coil is arranged at the joint of the mold core rod and the mold core bar in a sleeving mode, and a shielding ring is installed between the first heating coil and the second heating coil. By adjusting the heating power and the intermediate frequency of the corresponding heating coil I and the heating coil II, the temperature and the diathermanous depth of each area during expanding and bending of the stainless steel pipe are controlled, so that the pushing production is smoothly carried out, the large-scale high-efficiency mass production is realized, and the problem that in the prior art, due to the fact that the time for withdrawing, feeding and aligning is too long is solved. The temperature of the stainless steel pipe away from the heating coil is too low, and the diameter expansion and the bending are difficult to smooth.

Description

Technical Field

[0001] The utility model relates to the technical field of elbow heating and pushing production devices, in particular to a composite induction heating coil used for pushing and producing stainless steel elbows. Background Art

[0002] The existing medium frequency induction heating elbow pushing technology can already mass produce ordinary carbon steel elbows. However, for stainless steel and other alloy steel elbows, it is still in the experimental stage, and it is difficult to push out finished elbows, let alone mass production.

[0003] The prior art is briefly described as follows: first, the medium frequency induction heating coil is put on the mold mandrel, and the medium frequency power supply is started to heat the mold mandrel. Then the medium frequency induction heating coil is moved to the connection between the mandrel and the core rod to heat the raw steel pipe. The raw steel pipe is continuously advanced under the advancement of the hydraulic cylinder, enters the induction heating coil to be heated, and then advances to the mandrel to be expanded and bent into an elbow. In the experimental production of stainless steel elbows, after the stainless steel pipe raw material is heated in the induction heating coil, it continues to advance to the mandrel, is expanded and bent. After the raw material leaves the induction heating coil, its temperature drops rapidly, causing its expansion resistance and bending resistance to increase rapidly. The stainless steel pipe raw material at the back is still being heated and advanced. The front is difficult to advance due to too much resistance, so the stainless steel pipe in the heating coil or just out of the heating coil is wrinkled due to high temperature and low hardness, resulting in production failure. Or because the temperature of the front stainless steel pipe is low and the ductility is poor, the diameter is expanded, causing the pipe material to crack, or the core rod is broken due to excessive forward resistance, causing production failure. Utility Model Content

[0004] In order to solve the above technical problems, the technical solution provided by the utility model is: a composite induction heating coil for stainless steel elbows, including heating coil one and heating coil two, the heating coil one and heating coil two are set on a mold, the mold includes a mold core rod and a mold core bar, the heating coil one is set on the mold core rod, the heating coil two is set at the connection between the mold core rod and the mold core bar, and a shielding ring is installed between the heating coil one and the heating coil two.

[0005] Furthermore, the mold core rod is arranged in a curved structure.

[0006] Furthermore, the mold core bar is arranged as a straight structure.

[0007] Furthermore, the heating coil 1 and the heating coil 2 are powered by a medium frequency power supply.

[0008] The advantages of the utility model compared with the prior art are:

[0009] The utility model controls the temperature of each area and the heat penetration depth of the stainless steel pipe when the stainless steel pipe is expanded and bent by adjusting the heating power and the intermediate frequency of the corresponding heating coil one and the heating coil two, so that the pushing production can be carried out smoothly and large-scale and high-efficiency mass production can be realized. The problem in the prior art that the temperature of the stainless steel pipe leaving the heating coil is too low and it is difficult to expand and bend smoothly due to the reasons such as the long time for retracting, loading and matching. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 The utility model is a structural schematic diagram of a composite induction heating coil for a stainless steel elbow.

[0011] Among them, 1. Heating coil one, 2. Heating coil two, 3. Mold core rod, 4. Mold core bar, 5. Shielding ring. DETAILED DESCRIPTION

[0012] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0013] The utility model is described in detail with reference to the accompanying drawings.

[0014] The utility model provides a composite induction heating coil for a stainless steel elbow during specific implementation, comprising a heating coil 1 and a heating coil 2, wherein the heating coil 1 and the heating coil 2 are sleeved on a mold, and is characterized in that the mold comprises a mold core rod 3 and a mold core bar 4, the heating coil 1 is sleeved on the mold core rod 3, the heating coil 2 is sleeved at the connection between the mold core rod 3 and the mold core bar 4, and a shielding ring 5 is installed between the heating coil 1 and the heating coil 2. Example

[0015] When the utility model is implemented, it includes two groups of coils, namely heating coil 1 and heating coil 2. A shielding ring 5 can be installed between the heating coil 1 and the heating coil 2 as needed, or it can not be installed. Whether to install it can be set according to user needs.

[0016] The heating coil 1 is set on the thick end of the mold core rod 3, and the heating coil 2 is set on the connection between the mold core rod 3 and the mold core rod 4.

[0017] Before the elbow is produced, the heating coil 1 is started to heat the mold core rod 3, or multiple heating coils are started to heat according to the size of the mold. During formal production, the heating coil 2 is started to heat the stainless steel pipe. After the stainless steel pipe leaves the heating coil 2, it expands and bends at the core rod. Before the temperature of the stainless steel pipe drops, it enters the heating coil 1 to continue heating, expanding and bending. According to the production needs of different types of core rods and different types of stainless steel elbows, the heating power and intermediate frequency of the heating coil 1 and the heating coil 2 can be flexibly adjusted to control the temperature and heat penetration depth of each area when the stainless steel pipe is expanded and bent, so that the push production can proceed smoothly and large-scale and efficient mass production can be achieved.

[0018] As a further explanation of the present invention, the mold core rod 3 is a curved structure.

[0019] As a further elaboration of the present invention, the mold core bar 4 is arranged as a linear structure.

[0020] As a further elaboration of the present invention, the heating coil 1 and the heating coil 2 2 are powered by a medium frequency power supply.

[0021] The utility model provides a compound induction heating coil that can smoothly mass-produce and push stainless steel elbows. The compound induction heating coil of the utility model can be powered by a set of one-to-two intermediate frequency power supplies or by two sets of intermediate frequency power supplies.

[0022] The utility model adopts two or more induction heating coils to form a composite induction heating coil. A shielding ring can be installed between each heating coil according to the needs, or it can not be installed. It is used to solve the core problem that the current push-made stainless steel and other alloy steel elbows, especially stainless steel elbows, have always remained in trial production and are difficult to mass produce. It can also be used for the production of ordinary carbon steel elbows.

[0023] The above description of the utility model and its implementation methods is not restrictive. The drawings show only one implementation method of the utility model, and the actual structure is not limited thereto. In short, if ordinary technicians in this field are inspired by it and design structural methods and embodiments similar to the technical solution without creativity without departing from the purpose of the invention of the utility model, they should all fall within the protection scope of the utility model.

Claims

1. A composite induction heating coil for pushing and producing stainless steel elbows, comprising a heating coil 1 (1) and a heating coil 2 (2), wherein the heating coil 1 (1) and the heating coil 2 (2) are sleeved on a mold, characterized in that: The mold comprises a mold core rod (3) and a mold core bar (4); the heating coil one (1) is sleeved on the mold core rod (3); the heating coil two (2) is sleeved at the connection between the mold core rod (3) and the mold core bar (4); and a shielding ring (5) is installed between the heating coil one (1) and the heating coil two (2).

2. The composite induction heating coil for pushing and producing stainless steel elbows according to claim 1 is characterized in that: The mold core rod (3) is arranged in a bent structure.

3. The composite induction heating coil for pushing and producing stainless steel elbows according to claim 1 is characterized in that: The mold core bar (4) is arranged in a straight structure.

4. The composite induction heating coil for pushing and producing stainless steel elbows according to claim 1 is characterized in that: The heating coil 1 (1) and the heating coil 2 (2) are powered by a medium frequency power supply.

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