CN217283451U

CN217283451U - Electric induction heater for surface quenching of rope groove of winding drum

Info

Publication number: CN217283451U
Application number: CN202221427248.2U
Authority: CN
Inventors: 李静宇; 张杰义; 刘宗元; 王萌; 翟鹏宇; 李士阳
Original assignee: Henan Weihua Heavy Machinery Co Ltd
Current assignee: Henan Weihua Heavy Machinery Co Ltd
Priority date: 2022-06-09
Filing date: 2022-06-09
Publication date: 2022-08-23
Anticipated expiration: 2032-06-09

Abstract

An electric induction heater for surface quenching of a drum rope groove comprises a magnetizer and an induction coil, wherein the induction coil penetrates through the magnetizer; the magnetizer is provided with two protruding parts corresponding to the shape of the groove surface of the rope groove, and the distance between the two protruding parts is equal to the thread pitch of the rope groove. The two protruding parts enable magnetic lines of force to be distributed in the rope groove area needing to be heated, and the heating mode can remarkably improve the hardness and the wear resistance of the bottom of the rope groove. Because the magnetic force line bypasses the sharp corner part of the rope groove, the sharp corner part is prevented from generating cracks due to overhigh quenching temperature. The electric induction heater heats only a small part of the rope groove, the load of a quenching power supply is small, and the heat source is concentrated, so that the quenching quality is improved.

Description

Electric induction heater for surface quenching of rope groove of winding drum

Technical Field

The utility model relates to the field of cranes, in particular to an electric induction heater for surface quenching of a rope groove of a winding drum.

Background

In the field of universal cranes, as a core part in the lifting process, the higher the working grade of a winding drum is, the more serious the surface abrasion of a rope groove of the winding drum is. In order to ensure the surface quality of the rope groove of the winding drum, a material with higher strength is used at the rope groove part of the winding drum, and the strength of the surface of the rope groove of the winding drum is improved through heat treatment (quenching).

The existing problems are that because the diameter of the winding drum is large and the rope groove is deep, if a common spiral electric induction heater is used for heating the drum surface, firstly, the heating area is too large, and a quenching power supply cannot bear the large load; secondly, the heating temperature at the top of the rope groove is high, while the heating temperature at the bottom of the rope groove is low, so that the hardness at the bottom of the rope groove is low, the wear resistance is poor, the hardness at the top of the rope groove is high, and cracks are easily formed at the sharp corners of the rope groove. There is therefore a need for improvements to existing electric induction heaters.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects in the background art, the utility model discloses an electric induction heater for surface quenching of a winding drum rope groove, which adopts the following technical scheme:

an electric induction heater for surface quenching of a drum rope groove comprises a magnetizer and an induction coil, wherein the induction coil penetrates through the magnetizer; the magnetizer is provided with two protruding parts corresponding to the shape of the groove surface of the rope groove, and the distance between the two protruding parts is equal to the thread pitch of the rope groove.

According to the technical scheme, the magnetizer is formed by laminating silicon steel sheets, through holes are formed in the silicon steel sheets, and the inductance coil penetrates through the through holes.

The technical scheme is further improved, the inductance coil is made of a copper pipe, and cooling water is introduced into the copper pipe.

Further improve technical scheme, the copper pipe is square copper pipe.

Owing to adopt above-mentioned technical scheme, compare the background art, the utility model discloses following beneficial effect has:

the two protruding parts enable magnetic lines of force to be distributed in the rope groove area needing to be heated, and the heating mode can remarkably improve the hardness and the wear resistance of the bottom of the rope groove. Because the magnetic force line bypasses the sharp corner part of the rope groove, the sharp corner part is prevented from generating cracks due to overhigh quenching temperature.

Compared with a spiral electric induction heater for heating the circumferential direction of the drum surface, the electric induction heater only heats a small part of the rope groove, the load of a quenching power supply is small, the heat source is concentrated, and the quenching quality is improved.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic cross-sectional view of fig. 1.

In the figure: 1. a reel; 101. rope grooves; 2. silicon steel sheets; 201. a protrusion; 3. a square copper tube; 4. magnetic lines of force.

Detailed Description

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention. It should be noted that in the description of the present invention, the terms "front", "back", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate directions or positional relationships based on those shown in the drawings, which are merely for convenience of description, but do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. It should also be noted that, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly and include, for example, fixed or removable connections or integral connections; can be mechanically or electrically connected; either directly or indirectly through intervening media, or through both elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

An electric induction heater for surface quenching of a rope groove of a winding drum is used for heating a spiral rope groove 101 arranged on the winding drum 1, and the cross section of the rope groove 101 is semicircular. As shown in fig. 1-2, the electric induction heater includes a magnetizer and an induction coil, and the structure and function thereof will be described in detail below.

The magnetizer, also called a magnetic field concentrator or an iron core, can guide the direction of the magnetic force lines 4 because of its small magnetic resistance. In the present embodiment, the magnetic conductor is formed by laminating silicon steel sheets 2. The silicon steel sheet 2 has high magnetic permeability, low coercive force, large resistivity and the like, and thus has small hysteresis loss and eddy current loss.

As shown in fig. 1, the silicon steel sheets 2 are formed by punching with a punch, each silicon steel sheet 2 has two protrusions 201 corresponding to the shape of the groove surface of the rope groove 101, the distance between the two protrusions 201 is equal to the pitch of the rope groove 101, and the two protrusions 201 can extend into two adjacent circles of rope grooves 101.

As shown in fig. 2, since the groove surface of the rope groove 101 is a spiral surface, the protrusion 201 has an arc surface corresponding to the spiral surface by horizontally shifting each silicon steel sheet 2. Rectangular through holes are formed in the silicon steel sheets 2, and the inductance coils penetrate through the through holes. The inductance coil is made of a square copper tube 3, and cooling water is introduced into the square copper tube 3 and used for cooling the square copper tube 3 and the silicon steel sheet 2.

When the electric induction heating device works, the winding drum 1 rotates at a constant speed, and the electric induction heating device moves at a constant speed along the direction parallel to the axis of the winding drum 1, so that the protruding part 201 of the silicon steel sheet 2 is always positioned in the rope groove 101. Due to the existence of the two protrusions 201, the magnetic lines of force 4 generated by the square copper tube 3 are emitted from the protrusion 201 on one side of the silicon steel sheet 2, pass through the rope groove 101, and reach the protrusion 201 on the other side, so as to form a closed magnetic field. The alternating magnetic field generates an eddy current in the groove surface area of the rope groove 101, so that the groove surface area of the rope groove 101 is rapidly heated to reach the quenching temperature. Obviously, the two protrusions 201 distribute the magnetic field in the area of the rope groove 101 to be heated, and the heating mode can remarkably improve the hardness and the wear resistance of the bottom of the rope groove 101.

As can be seen from fig. 1, due to the protrusion 201, the magnetic lines of force 4 bypass the sharp corner portion of the rope groove 101, and the sharp corner portion is prevented from cracking due to an excessively high quenching temperature. Compared with a spiral electric induction heater for heating the circumferential direction of the barrel surface, the electric induction heater only heats a small part of the rope groove 101, the load of a quenching power supply is small, the heat source is concentrated, and the quenching quality is improved.

The details of which are not described in detail in the prior art. Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. An electric induction heater for surface quenching of a rope groove of a winding drum is characterized in that: the induction coil penetrates through the magnetic conductor; the magnetizer is provided with two protruding parts corresponding to the shape of the groove surface of the rope groove, and the distance between the two protruding parts is equal to the thread pitch of the rope groove.

2. The electric induction heater for surface quenching of drum rope grooves as claimed in claim 1, characterized by: the magnetizer is formed by laminating silicon steel sheets, through holes are formed in the silicon steel sheets, and the inductance coils penetrate through the through holes.

3. The electric induction heater for surface quenching of drum rope grooves as claimed in claim 1, characterized by: the inductance coil is made of a copper pipe, and cooling water is introduced into the copper pipe.

4. An electric induction heater for surface quenching of drum rope grooves as claimed in claim 3 wherein: the copper pipe is a square copper pipe.