CN111014472B

CN111014472B - Electromagnetic induction heating method for large arc-shaped metal workpiece

Info

Publication number: CN111014472B
Application number: CN201911382373.9A
Authority: CN
Inventors: 刘迎; 刘博巍; 吴旭峰; 夏彬; 孙忠平
Original assignee: Shanghai Kingkey Industry Development Co ltd
Current assignee: Shanghai Kingkey Industry Development Co ltd
Priority date: 2019-12-28
Filing date: 2019-12-28
Publication date: 2022-02-22
Anticipated expiration: 2039-12-28
Also published as: CN111014472A

Abstract

The invention relates to an electromagnetic induction heating method of a large arc-shaped metal workpiece, which comprises the following steps: firstly, a workpiece to be heated is placed on a roller carrier, then an electromagnetic induction heating tool is placed below the workpiece to be heated, and the electromagnetic induction heating tool is close to the minimum radius of the workpiece to be heated, so that the electromagnetic induction heating tool is kept fixed; the electromagnetic induction module is electrified to heat the position of the minimum radius of the workpiece to be heated at first, when the workpiece to be heated is heated to the required temperature, the workpiece to be heated rotates a certain position on the roller frame, the electromagnetic induction module heats the corresponding position after the workpiece to be heated rotates, and the workpiece to be heated rolls and is heated until the whole workpiece to be heated is heated. The invention can enable the heating tool to be close to the continuously rotating arc-shaped heated workpiece with irregular diameter as much as possible, and simultaneously improves the fault tolerance rate of the induction heating equipment in actual use and the production efficiency.

Description

Electromagnetic induction heating method for large arc-shaped metal workpiece

Technical Field

The invention relates to an electromagnetic induction heating method for a large arc-shaped metal workpiece, and belongs to the technical field of electromagnetic induction heating.

Background

In the traditional manufacturing industry, metal workpieces are often required to be heated, and the traditional heating modes are generally two types:

1. the flame heating mode is adopted, fuel is consumed, waste gas and waste residue are discharged in the heating process, most heat is dissipated to the environment in the heating process, a large amount of energy is wasted, the energy utilization rate is low, the workpiece is always contacted with the fuel and oxides thereof in the heating process, foreign matters are easy to invade, and therefore the quality of the workpiece is influenced;

2. resistance wires are adopted for heating, and the resistance wires are commonly used in the heating mode. However, resistance wire heating has the disadvantages of slow heating speed, large heat loss, low heat efficiency and easy damage.

Electromagnetic induction heating is to generate an alternating magnetic field around an induction coil by passing an alternating current with a certain frequency through the coil. The electromagnetic induction action of the alternating magnetic field generates a closed induction current, namely an eddy current, in the workpiece. The generated vortex causes the metal to directly heat, thereby greatly reducing the heat loss and improving the energy utilization rate. Therefore, electromagnetic induction is a great trend in heating metal workpieces.

An electromagnetic induction heating apparatus is a heating apparatus manufactured by applying the principle of induction heating. Heating tools are important components of induction heating equipment.

The basic fittings of the existing complete set of electromagnetic induction heating equipment comprise: induction heating host computer, power cord, extension cord, induction heating frock. Wherein, the induction heating host computer converts the power frequency electric current of input into high frequency electric current, produces high frequency alternating magnetic field through heating frock, and the work piece that is heated cuts the magnetic line of force, and inside produces powerful vortex to self generates heat.

A common electromagnetic induction heating tool is composed of a metal wire wrapped with an insulating layer and a supporting material. The metal wire is coiled into a spiral shape and then fixed on various types of supporting materials such as high silica cloth and epoxy resin materials.

The electromagnetic induction heating tool is divided into a hard tool and a soft tool. The soft tool can change the appearance, the size and the size of the tool at will, but the preparation work before heating and the ending work after heating are more complicated. The shape of the hard tool cannot be changed, but the preparation work before heating and the ending work after heating are simpler.

At present, an electromagnetic induction heating tool is generally used for heating metal workpieces with corresponding radians, such as pipelines, bearings and the like. The distance between the tool and the heated workpiece is kept within 1-3 cm, when the distance exceeds 3cm, the induction heating host cannot output all power, and when the distance is too large, the host can report errors and stop working; and because the diameter of the heated workpiece reaches 8m, the whole welding line cannot be heated simultaneously by adopting the existing electromagnetic induction heating tool, and because of the deviation of the processing precision, the diameter of the large arc-shaped metal workpiece can generate deviation, the uniform distance between the large arc-shaped metal workpiece and the heating tool cannot be kept, the heating is interrupted when the distance is too large, and the heating tool is crushed when the distance is too small.

Disclosure of Invention

The invention aims to solve the technical problem of providing an electromagnetic induction heating method of a large arc-shaped metal workpiece in the prior art, which can enable a heating tool to be close to a continuously rotating arc-shaped heated workpiece with irregular diameter as much as possible, and simultaneously improve the fault tolerance rate of the induction heating equipment in actual use and the production efficiency.

The technical scheme adopted by the invention for solving the problems is as follows:

compared with the prior art, the invention has the advantages that:

1. the induction heating tool can be close to the continuously rotating arc-shaped heated workpiece with irregular diameter as much as possible, the distance between the tool and the workpiece cannot exceed the induction range of the induction heating host by 3cm, the heating power of the induction heating host is reduced, and the production efficiency is improved;

2. according to the invention, the metal wire wrapped with the heat insulation layer is fixed on the FR-4 epoxy board to be manufactured into the hard tool, so that the preparation work before heating and the ending work after heating are simplified.

Drawings

Fig. 1 is a schematic structural diagram of a retractable electromagnetic induction heating tool for heating a large arc-shaped metal workpiece according to the present invention.

Fig. 2 is a side view of fig. 1.

Fig. 3 is a cross-sectional view of the rail groove of fig. 1 at the location.

Fig. 4 is a schematic structural view of the support assembly in fig. 1.

Fig. 5 is a sectional view a-a of fig. 4.

Fig. 6 is a sectional view B-B of fig. 5.

Fig. 7 is a schematic perspective view of the preheating assembly of fig. 1.

Fig. 8 is a front view of fig. 7.

Fig. 9 is a top view of fig. 7.

Wherein:

support assembly 1

Base 11

Supporting frame 12

Front vertical support 121

Rear vertical support 122

Side support tube 123

Diagonal brace 124

Rail pad 125

Plug 126

Longitudinal support 127

Cross arm 13

Track groove 14

Nut 15

Screw 16

Caster 17

Preheating assembly 2

Preheating support 21

Electromagnetic induction heating module 22

Middle side plate 211

Peripheral side plate 212

First card slot 213

First fixing plate 214

Second card slot 215

Second fixing plate 216

First roller 217

Second roller 218

Hinge hole 219

Arc guide groove 2110

First extension spring 3

Second extension spring 4

Limit stop 5

First long stud 6

Second long stud 7

Guide wheel 8

First articulated shaft 9

A set screw 10.

Detailed Description

The invention is described in further detail below with reference to the accompanying examples.

Referring to fig. 1 to 9, the telescopic electromagnetic induction heating tool for heating a large arc-shaped metal workpiece according to the present invention includes a support assembly 1, wherein a preheating assembly 2 is disposed on the support assembly 1;

the supporting component 1 comprises a base 11, a left supporting frame and a right supporting frame 12 are arranged on the base 11, a cross brace 13 is arranged between the left supporting frame and the right supporting frame 12, the supporting frames 12 comprise a front vertical support 121 and a rear vertical support 122, the height of the rear vertical support 122 is greater than that of the front vertical support 121, a side supporting tube 123 is arranged between the tops of the front vertical support 121 and the rear vertical support 122, the side supporting tube 123 is arc-shaped, an inclined strut 124 is arranged between the middle part of the side supporting tube 123 and the rear vertical support 122, the inclined strut 124 is arranged along the radial direction of the side supporting tube 123, an upper rail cushion block and a lower rail cushion block 125 are arranged on the inner side of the inclined strut 124, a rail groove 14 is arranged between the upper rail cushion block and the lower rail cushion block, and a plurality of screws 16 are uniformly arranged on the side supporting tube 123 at intervals through nuts 15;

the upper end and the lower end of the side supporting pipe 123 are both provided with plugs 126;

a longitudinal support 127 is further arranged between the front vertical support 121 and the rear vertical support 122, and the longitudinal support 127 is positioned below the side support tube 123;

a plurality of casters 17 are arranged at the bottom of the base 11;

the preheating assembly 2 comprises a preheating support 21, the whole preheating support 21 is arc-shaped, and a plurality of electromagnetic induction heating modules 22 are arranged on the preheating support 21 at intervals from front to back;

the preheating support 21 comprises a left middle side plate 211 and a right middle side plate 211 which are arranged in parallel, the front side and the rear side of each middle side plate 211 are respectively provided with a peripheral side plate 212, the peripheral side plates 212 are hinged with the middle side plates 211, the top of each middle side plate 211 is provided with a plurality of first clamping grooves 213, the inner side of each middle side plate 211 is provided with a first fixing plate 214 at the corresponding position of each first clamping groove 213, the top of each peripheral side plate 212 is provided with a plurality of second clamping grooves 215, the inner side of each peripheral side plate 212 is provided with a second fixing plate 216 at the corresponding position of each second clamping groove 215, and the electromagnetic induction heating module 22 is arranged between the left corresponding first fixing plate 214 and the right corresponding second fixing plate 216 or between the left corresponding second fixing plate and the right corresponding second fixing plate 216;

a first roller 217 is arranged at the upper part of the outer side of the first fixing plate 214, the first roller 217 is placed in the first clamping groove 213, a second roller 218 is arranged at the upper part of the outer side of the second fixing plate 216, and the second roller 218 is placed in the second clamping groove 215;

a first long stud 6 is arranged between the lower parts of the left and right corresponding first fixing plates 214 in a penetrating manner, and the left and right ends of the first long stud 6 are respectively connected with screws 16 at corresponding positions on the left and right side supporting tubes 123 through first extension springs 3; a second long stud 7 is arranged between the lower parts of the left and right corresponding second fixing plates 216 in a penetrating manner, and the left and right ends of the second long stud 7 are respectively connected with screws 16 at corresponding positions on the left and right side supporting tubes 123 through second extension springs 4;

the peripheral side plate 212 is provided with a hinge hole 219 near one side of the middle side plate 211, and the peripheral side plate 212 is hinged with the middle side plate 211 through a first hinge shaft 9;

an arc guide groove 2110 is formed below the hinge hole 219, a limit screw 10 is arranged in the arc guide groove 2110, and the limit screw 10 is connected with the middle side plate 211;

the electromagnetic induction heating module 22 comprises a wiring groove plate 221, a plurality of wiring grooves 222 are arranged on the wiring groove plate 221 at intervals from left to right, metal wires wrapping heat insulation layers are wound in the wiring grooves 222, and a wiring groove pressing plate 223 is arranged on the wiring groove plate 221;

the wiring groove plate 221 and the wiring groove pressing plate 223 both adopt FR-4 epoxy plates;

at least two guide wheels 8 are arranged on the outer side of the middle side plate 211 along the radial direction, and the guide wheels 8 are arranged in the track grooves 14;

the lower end of the track groove 14 is provided with a limit stop 5.

The working principle is as follows:

when a large arc-shaped metal workpiece needs to be heated, the large arc-shaped metal workpiece is firstly placed on a roller frame, then an electromagnetic induction heating tool is placed below the workpiece to be heated, the electromagnetic induction tool is close to the minimum radius of the workpiece to be heated, the tool is fixed, the workpiece to be heated is heated while rolling, a worker can synchronously perform welding work at the heated position, and the preheating support has elasticity under the action of an extension spring, so that the heating module can be always ensured to be tightly attached to the heated workpiece, the heating is ensured to be normally performed, and the heating uniformity is better; even when the position of the maximum radius of the heated workpiece rotates to the electromagnetic induction heating tool, the tension spring can disperse pressure, and the tool cannot be crushed.

In addition, the present invention also includes other embodiments, and any technical solutions formed by equivalent transformation or equivalent replacement should fall within the protection scope of the claims of the present invention.

Claims

1. An electromagnetic induction heating method of a large arc-shaped metal workpiece is characterized by comprising the following steps:

firstly, a workpiece to be heated is placed on a roller carrier, then an electromagnetic induction heating tool is placed below the workpiece to be heated, and the electromagnetic induction heating tool is close to the minimum radius of the workpiece to be heated, so that the electromagnetic induction heating tool is kept fixed;

the electromagnetic induction heating tool comprises a supporting assembly, and a preheating assembly is arranged on the supporting assembly; the supporting component comprises a base, and a left supporting frame and a right supporting frame are arranged on the base; the preheating assembly comprises a preheating support, the whole preheating support is in an arc shape, the preheating support is arranged between a left support frame and a right support frame, the preheating support is connected with the left support frame and the right support frame through extension springs, and a plurality of electromagnetic induction heating modules are arranged on the preheating support at intervals from front to back;

the electromagnetic induction module on the preheating support is electrified and then firstly heats the position of the minimum radius of the workpiece to be heated, when the workpiece to be heated is heated to the required temperature, the workpiece to be heated is rotated on the roller frame by a certain position, at the moment, the electromagnetic induction module heats the corresponding position after the workpiece to be heated is rotated, and the workpiece to be heated is heated while rolling until the whole workpiece to be heated is heated.

2. The electromagnetic induction heating method of a large-sized arc-shaped metal workpiece according to claim 1, characterized in that: the support frame includes preceding perpendicular support and the back is erected the support, the height that the back is erected the support is greater than the height that preceding perpendicular supported, preceding perpendicular support and back are erected and are supported the top and be provided with the side stay tube, the side stay tube is circular-arc, the interval is provided with a plurality of screws on the side stay tube.

3. The electromagnetic induction heating method of a large-sized arc-shaped metal workpiece as set forth in claim 2, characterized in that: the utility model discloses a side stay tube, including side stay tube, back erect and support, be provided with the bracing between side stay tube middle part and the back erect the support, the bracing inboard is provided with the track groove, the track groove is arranged along the radial of side stay tube.

4. The electromagnetic induction heating method of a large-sized arc-shaped metal workpiece according to claim 1, characterized in that: the preheating support comprises a left middle side plate and a right middle side plate which are arranged in parallel, peripheral side plates are arranged on the front side and the rear side of each middle side plate respectively and hinged to the middle side plates, a plurality of first clamping grooves are formed in the tops of the middle side plates, first fixing plates are arranged on the inner sides of the middle side plates at the corresponding positions of the first clamping grooves, a plurality of second clamping grooves are formed in the tops of the peripheral side plates, second fixing plates are arranged on the inner sides of the peripheral side plates at the corresponding positions of the second clamping grooves, and the electromagnetic induction heating modules are arranged between the left corresponding first fixing plates and the right corresponding second fixing plates or between the left corresponding second fixing plates and the right corresponding second fixing plates.

5. The electromagnetic induction heating method of a large-sized arc-shaped metal workpiece as set forth in claim 4, wherein: the upper part of the outer side of the first fixing plate is provided with a first roller which is placed in the first clamping groove, the upper part of the outer side of the second fixing plate is provided with a second roller which is placed in the second clamping groove.

6. The electromagnetic induction heating method of a large-sized arc-shaped metal workpiece as set forth in claim 4, wherein: the peripheral side plate is provided with a hinge hole at one side close to the middle side plate and is hinged with the middle side plate through a first hinge shaft; an arc-shaped guide groove is formed below the hinge hole, a limit screw is arranged in the arc-shaped guide groove, and the limit screw is connected with the middle side plate.

7. The electromagnetic induction heating method of a large-sized arc-shaped metal workpiece as set forth in claim 3, wherein: the preheating support comprises a left middle side plate and a right middle side plate which are arranged in parallel, peripheral side plates are arranged on the front side and the rear side of each middle side plate respectively and hinged to the middle side plates, a plurality of first clamping grooves are formed in the tops of the middle side plates, first fixing plates are arranged on the inner sides of the middle side plates at the corresponding positions of the first clamping grooves, a plurality of second clamping grooves are formed in the tops of the peripheral side plates, second fixing plates are arranged on the inner sides of the peripheral side plates at the corresponding positions of the second clamping grooves, and the electromagnetic induction heating modules are arranged between the left corresponding first fixing plates and the right corresponding second fixing plates or between the left corresponding second fixing plates and the right corresponding second fixing plates.

8. The electromagnetic induction heating method of a large-sized arc-shaped metal workpiece as set forth in claim 7, wherein: a first long stud is arranged between the lower parts of the left and right corresponding first fixing plates in a penetrating manner, and the left and right ends of the first long stud are respectively connected with screws at corresponding positions on the left and right side supporting tubes through first extension springs; and a second long stud is arranged between the lower parts of the left and right corresponding second fixing plates in a penetrating manner, and the left and right ends of the second long stud are respectively connected with screws at corresponding positions on the left and right side supporting tubes through second extension springs.

9. The electromagnetic induction heating method of a large-sized arc-shaped metal workpiece as set forth in claim 7, wherein: at least two guide wheels are arranged on the outer side of the middle side plate along the radial direction and arranged in the track groove.

10. The electromagnetic induction heating method of a large-sized arc-shaped metal workpiece according to claim 1, characterized in that: the electromagnetic induction heating module comprises a wiring groove plate, a plurality of wiring grooves are formed in the wiring groove plate at intervals from left to right, metal wires are wound in the wiring grooves, and a wiring groove pressing plate is arranged on the wiring groove plate.