KR100333436B1 - Bearing induction heater - Google Patents

Abstract

The present invention relates to a bearing induction heater that has a function of demagnetizing residual magnetism present in a bearing after a heating operation to prevent iron powder, etc. from being attached to a bearing and a mechanical device, thereby extending the service life to the maximum.

The coil body is embedded in the heater body, and both end surfaces of the "C" iron core vertically protruding to the outside of the heater body, and the bearing to be heated across the protruding both end surfaces of the "C" iron core are inserted. Including a crossbar (4); The heater body includes a key input unit for inputting control signals such as temperature setting and time setting; A sensor unit for sensing a temperature of the bearing and the coil; A control unit which receives the signals of the key input unit and the sensor unit and controls the operation of the entire system; A power switching switch to determine a power supply to the coil to generate a magnetic field in the coil so that the temperature of the bearing is increased; When the temperature of the bearing rises to the set temperature and the power switching switch is cut off and the heating operation is completed, the demagnetizing portion for demagnetizing the residual magnetic present in the bearing is included.

Description

Bearing Induction Heater {Bearing induction heater}

The present invention relates to a bearing induction heater, and more particularly, to a bearing induction heater capable of heating the entire bearing in a short time by the electromagnetic induction heating method.

In general, a bearing refers to a mechanical element that supports a load acting on a rotating or moving shaft. In the manufacturing, assembling, and repairing of various machines, a bearing is often assembled to a shaft. do.

At this time, as a method of assembling the bearing to the rotating shaft, a method of assembling by applying pressure with a hammer, a hydraulic press, etc., a method of assembling by heating directly from the outside using a torch, electric heater, etc. And the like are used.

However, these methods reduce the precision due to self-damage due to the impact and thermal deformation of the bearing, and the bearing life is shortened due to the contamination of the bearing and the loss of the enclosed lubricant, and the bearing insertion work is inefficient. Cause problems.

That is, the failure of the mechanical device is caused more by the problems in the bearing assembly process than by the bearing itself.

In order to solve the above problems, a bearing induction heater has been proposed. The bearing induction heater has an electromotive force induced by an electromagnetic induction in the cross section of an electric conductor placed in an alternating magnetic field. When it flows, Joule heat is produced while the said eddy current flows, and it is the apparatus comprised so that the bearing may be heated by applying the principle which raises the temperature of a conductor.

1 is a perspective view showing the appearance of a general bearing induction heater to which the prior art is applied.

Referring to FIG. 1, a coil (not shown) for generating a magnetic field according to the supply of power is built in the heater body 1, and is vertically spaced at a predetermined interval on the upper side of the heater body 1. First and second body bars 2 and 3 are provided, and crossbars 4 are provided across the upper end surfaces of the first and second body bars 2 and 3. In this case, the crossbar 4 may be separated from the first and second body bars 2 and 3, and a heated object such as a bearing 5 may be inserted therein.

In the above configuration, the first and second body bars 2 and 3 generally use a C-type iron core connected to the inside of the heater body 1, and are located at a portion located inside the heater body 1. Coils (not shown) are wound.

Briefly describing the operation of a general bearing induction heater having the configuration as described above are as follows.

First, when the user connects the power plug 6 to the power supply device, inserts the bearing 5 into the crossbar 4, and then turns on the power switch 7, the AC power is supplied to the heater body. Supplied to a coil (not shown) provided inside (1), a large amount of current flows through the coil (not shown), thereby the coil (not shown) and the first and second body bars (2, 3) The C-type iron core and the crossbar (4) is to induce a strong magnetic field in the magnetic closure circuit.

At this time, the magnitude of the magnetic field is proportional to the magnitude of the current, it can be seen that the pulsation at the same frequency as the frequency of the AC power supplied from the outside.

As a result, the conductors placed in the alternating magnetic field, that is, the bearing 5, are induced with an electromotive force proportional to the square of the alternating frequency and the square of the magnitude of the magnetic field, and thus an eddy current is generated, and this eddy current is converted into Joule heat so that the bearing 5 ) Will raise its temperature.

When the self-temperature of the bearing 5 reaches a certain temperature by the above operation, the user separates the crossbar 4 from the first and second body bars 2 and 3 and pulls out the bearing 5. When inserted into the rotating shaft can be easily worked.

As such, when the bearing induction heater is used, the bearing induction heater can be heated quickly and uniformly while preventing the contamination of the bearing while maintaining the lubrication state of the original bearing. In addition, the use of a separate fire is not possible to escape the risk of fire during bearing assembly work.

However, since the magnetic component is generated in the bearing 5 during the temperature increase of the bearing 5 by using the bearing induction heater according to the prior art as described above, when the powder is attached to the rotating shaft and used, the iron powder is stuck and damaged. There is a problem that the noise is generated during the operation of the mechanical device, thereby reducing the life and at the same time malfunction of the mechanical device.

The present invention has been made in order to solve the problems of the prior art as described above, the object is to provide a function to demagnetize the residual magnetic present in the bearing after the heating operation to prevent the attachment of iron powder to the bearing and the mechanical device It is to provide a bearing induction heater that can maximize the life.

In addition, another object of the present invention is to induce a bearing that can improve the ease of use by maintaining the temperature of the heating operation is automatically stopped when the temperature of the bearing is raised to a set temperature, and informs the user of the state To provide a heater.

1 is a perspective view showing the appearance of a typical bearing induction heater

Figure 2 is a block diagram showing the configuration of a bearing induction heater according to the present invention

3 is a circuit diagram according to an embodiment of a bearing induction heater according to the present invention;

Figure 4 is a view showing the button shape of the control panel attached to the main body of the bearing induction heater according to the present invention

<Description of Symbols for Main Parts of Drawings>

1 heater body 2 first body bar

3: second body bar 4: crossbar

5: bearing 6: power plug

7: power switch

10: key input unit 20: sensor unit

21: first temperature sensor 22: second temperature sensor

30: control unit 40: power switch

50: removing unit 60: display unit

71: Temperature setting button 72: Time setting button

73: time display button 74: increase button

75: decrease button 76: change amount button

77: setting button 81: power button

82: start button 83: stop button

84: demagnetization button 85: temperature maintenance button

86: reverse force button

According to a main feature of the present invention for achieving the above object, a coil wound portion is built into the heating main body and both ends are vertically projected "C" type iron core with a predetermined distance to the outside of the heater body, and In a bearing induction heater comprising a crossbar (4) across the two protruding cross-sections of the "C" type iron core and fitted with the bearing to be heated,

The heater main body includes: a key input unit through which a user inputs control signals such as temperature setting and time setting for operating the system; A sensor unit for sensing a temperature of the bearing and the coil during operation of the system; A control unit which receives the signals of the key input unit and the sensor unit and controls the operation of the entire system; A power switching switch configured to determine a supply of power to the coil according to a control signal of the controller to generate a magnetic field in the coil so that the bearing temperature is increased; When the temperature of the bearing rises to the set temperature and the power switching switch is cut off and the heating operation is completed, the AC power is supplied for a predetermined time in the opposite direction to the heating operation according to the control signal of the control unit. The present invention provides a bearing induction heater including a magnetic stripping unit.

At this time, according to an additional feature of the invention, the sensor unit comprises a first temperature sensor for sensing the temperature of the bearing, and a second temperature sensor for sensing the temperature of the coil; The control unit preferably includes a function of shutting off the power switching switch when the overheat is detected according to signals input from the first and second temperature sensors to terminate the heating operation.

In addition, according to another additional feature of the present invention, the power switching unit is preferably configured to include a reversing force means for heating the bearing by supplying only 50% of the power to the coil in accordance with the control signal of the controller. Do.

The above objects and various advantages of the present invention will become more apparent from the preferred embodiments of the present invention described below with reference to the accompanying drawings by those skilled in the art.

Hereinafter, a preferred embodiment according to the present invention will be described in detail with reference to the accompanying drawings.

Figure 2 is a block diagram showing the configuration applied to the body of the bearing induction heater according to the present invention.

First, the outer shape of the bearing induction heater to which the present invention is applied is, as described in FIG. 1, the heater body 1, the first and second body bars 2 and 3, which are part of the “C” type iron core, and the crossbar 4. Is provided. The crossbar 4 selects a bar having a size suitable for the size of the bearing 5, that is, the inner diameter.

At this time, the crossbar (4) is hinged to be rotatable in the upper surface of any one of the first and second body bars (2, 3) so that the operation of inserting or removing the bearing (5) is made easy. do. That is, after the heating operation of the bearing 5 is completed, the crossbar 4 is rotated without being completely separated from the first and second body bars 2 and 3 to remove the bearing 5, thereby making the operation simple. You lose.

On the other hand, the inside of the heater body (1) has a configuration as shown in Figure 2, the front portion is attached to the control panel is formed with a plurality of buttons as shown in FIG.

Referring to FIG. 2, reference numeral 10 denotes a key input unit through which a user inputs control signals such as temperature setting and time setting for the operation of the system, and 20 denotes a sensor for detecting the temperature of the bearing and the coil during operation of the system. 30 denotes a control unit which receives signals from the key input unit 10 and the sensor unit 20 to control the operation of the entire system.

In addition, reference numeral 40 denotes a power opening and closing switching unit to determine the power supply to the coil in accordance with the control signal of the control unit 30 to generate a magnetic field in the coil so that the bearing temperature is increased, 50 is a bearing temperature When the heating operation is completed by rising to a set temperature and the power switching switch 40 is cut off, the AC power is supplied to the bearing for a predetermined time in the opposite direction to the heating operation according to the control signal of the controller 30. A demagnetization unit for demagnetizing existing residual magnets is shown, and 60 denotes a display unit for displaying a temperature and time set in a setting operation or a current temperature and time in a heating operation according to a control signal of the controller 30.

At this time, the sensor unit 20 is configured to include a first temperature sensor 21 for sensing the temperature of the bearing, and a second temperature sensor 22 for sensing the temperature of the coil.

In addition, the power switching unit 40 may include a reverse force means (not shown) for heating the bearing by supplying only 50% of the power to the coil in accordance with the control signal of the control unit 30.

A circuit diagram showing an embodiment of a bearing induction heater according to the present invention having each of the above configurations is shown in FIG. 3.

Meanwhile, referring to FIG. 4, the control panel includes a plurality of buttons constituting the key input unit 10 and a display unit 60. Reference numeral 71 denotes a temperature setting button for allowing the system to enter the temperature setting mode. 72 indicates a time setting button for allowing the system to enter the time setting mode, 73 indicates a time display button for determining whether to display the time in seconds or minutes, and 74 indicates the setting of the temperature and time. Indicate the increase button to increase the set value according to the time key input, 75 indicates the decrease button to decrease the set value according to the key input when setting the temperature and time, and 76 change to the key input when setting the temperature and time. A change amount button for determining a reference amount to be set is shown, and 77 indicates a setting button for determining setting completion when the set value is reached when setting the temperature and time. All.

Also, reference numeral 81 denotes a power button which is selected by the user when starting or terminating the operation of the system to determine the power supply to the system, and 82 denotes a heating operation for heating the bearing after completion of setting of the temperature and time. 83 shows a start button for determining the start, 83 shows a stop button for determining the stop of the heating operation in case of abrupt stop during the heating operation of the bearing, and 84 indicates a residual magnetic field present in the bearing after the heating operation of the bearing is completed. Demagnetization button for determining the progress of the operation to remove the, 85 indicates a temperature holding button for determining the progress of the function to maintain the set temperature as it is after the heating operation of the bearing, 86 is 50 during the heating operation of the bearing A half-power button is used to determine the progression of the function to allow the heating operation to take place using% power. To burn.

Referring to the operation of the bearing induction heater according to the present invention having each configuration as described above in detail as follows.

First, as described in the description of FIG. 1, the user connects the power plug 6 to an external power supply device and inserts the bearing 5 into the crossbar 4. The power button 81 is then selected to determine the power supply to the system.

At this time, the user sets the temperature or time using a plurality of buttons provided in the key input unit 10. For example, if the temperature is to be set, the temperature setting button 71 is selected to allow the system to enter the temperature setting mode, and the display unit 60 is selected while selecting the increase button 74 or the decrease button 75. ), The desired setting value is displayed. At this time, the change amount button 76 is selected to determine the reference amount to be changed as 1, 10, 100, and when the desired setting value is reached, the setting button 77 is selected to input the setting completion.

When the setting of the temperature or time is completed by the above process, the user selects the start button 82 so that the heating operation of the bearing 5 is performed, and the stop button 83 is to be abruptly stopped during the heating operation. To stop the heating operation. At this time, when the start button 82 is selected, the control unit 30 operates the power switching switch 40 so that AC power is supplied to the coil so that Joule heat is generated in the bearing 5 so that the bearing 5 is operated. Allow the temperature to rise.

On the other hand, when the heating operation of the bearing 5 is normally completed, the user selects the demagnetization button 84 to remove the residual magnetic present in the bearing (5). Even in this case, the controller 30 operates the demagnetizing unit 50 according to the selection of the demagnetizing button 84 so that the direction of the current supplied to the coil flows in the opposite direction for a predetermined time to proceed with demagnetization. In this case, the demagnetizing function may be automatically performed after the heating operation of the bearing 5 is performed, and may be performed manually according to the user's selection of the demagnetizing button 84 even when the heating operation is not performed. have.

On the other hand, during the heating operation of the bearing 5, the user can select the temperature holding button 85 or the reverse force button 86 to maintain the set temperature after the heating operation of the bearing (5), bearing In the heating operation of (5), the heating operation may be performed using 50% of electric power.

During the heating operation of the bearing 5, the first and second temperature sensors 21 and 22 of the sensor unit 20 continuously measure the temperature of the bearing 5 and the coil and provide the same to the controller 30. If overheating is determined by the control unit 30, the control unit 30 automatically cuts off the power switching unit 40 to stop the heating operation.

When heated and degassed by the above process, the user separates the crossbar 4 from the first and second body bars 2 and 3, and removes the bearing 5 to be inserted into the rotating shaft.

At this time, since the crossbar 4 is hinged to be rotatable on the top surface of any one of the first and second body bars 2 and 3, the heating operation of the bearing 5 is completed. The crossbar 4 is preferably rotated without being completely separated from the first and second body bars 2 and 3 to remove the bearing 5 so as to simplify the operation.

While the invention has been shown and described with respect to particular embodiments, it will be apparent to those skilled in the art that various modifications and changes can be made without departing from the spirit and scope of the invention as indicated by the appended claims. Anyone can grow up easily.

As described above, the bearing induction heater according to the present invention has a function of demagnetizing residual magnetism present in the bearing after the heating operation of the bearing to prevent the attachment of iron powder to the bearing and the mechanical device, thereby extending the life to the maximum. It can be effected.

In addition, the bearing induction heater of the present invention is to stop the heating operation automatically when the temperature of the bearing is raised to the set temperature to maintain the temperature, and to inform the user of the state can improve the convenience of use It works.

In addition, the bearing induction heater of the present invention is provided with a reverse force button 86, the heating operation is performed by using 50% of the power during the heating operation of the bearing (5) has the effect of reducing the power consumption.

Claims (3)

The coil body is embedded in the heater body, and both end surfaces of the "C" iron core vertically protruded at a predetermined distance to the outside of the heater body, and across and over both protruding end faces of the "C" iron core to be heated. In the bearing induction heater comprising a crossbar (4) to which the bearing is fitted, The heater main body includes: a key input unit through which a user inputs control signals such as temperature setting and time setting for operating the system; A sensor unit for sensing a temperature of the bearing and the coil during operation of the system; A control unit which receives the signals of the key input unit and the sensor unit and controls the operation of the entire system; A power switching switch configured to determine a supply of power to the coil according to a control signal of the controller to generate a magnetic field in the coil so that the bearing temperature is increased; When the temperature of the bearing rises to the set temperature and the power switching switch is cut off and the heating operation is completed, the AC power is supplied for a predetermined time in the opposite direction to the heating operation according to the control signal of the control unit. Bearing induction heater characterized in that it comprises a demagnetizing portion for demagnetizing. The method of claim 1, The sensor unit includes a first temperature sensor for sensing the temperature of the bearing, and a second temperature sensor for sensing the temperature of the coil; The control unit has a bearing induction heater, characterized in that the heating operation is terminated by shutting off the power switching switch when the overheat is detected according to the signals input from the first and second temperature sensors. The method of claim 1, The power switching switch is configured to include a reversing force means for heating the bearing by supplying only 50% of the power to the coil in accordance with the control signal of the control unit.