KR100786191B1 - Polishing apparatus for welding tip - Google Patents

Abstract

A polishing apparatus of a welding tip is provided to control a rotation speed of a polishing gear by sticking a rotation plate to one surface of the polishing gear and by installing a rotation sensor sensing a rotation state of the rotation plate in one side of a dressing unit. A polishing apparatus of a welding tip comprises: a main frame, a motor installed in one side of the main frame, a dressing unit(30) installed in one side of the main frame, in which a polishing gear(35) mounted with a cutter(35a) is installed in an inside diameter portion, a rotation plate(45) attached to one surface of the polishing gear, which is rotated with the polishing gear, a rotation sensor(40) outputting a rotation sensing signal corresponding to rotation of the rotation plate, a clock unit installed in other side of the main frame, which provides time information, an alarm installed in another side of the main frame, and a controller controlling the rotation sensor, the motor, the clock unit and the alarm.

Description

Polishing Apparatus for Welding Tip

1 is a perspective view showing the installation and use of the welding tip polishing apparatus according to the prior art.

2 is a schematic perspective view of a dressing unit according to the prior art.

3 is a cross-sectional view taken along the line V-V of FIG.

Figure 4 is a perspective view showing the installation and use of the welding tip polishing apparatus according to the present invention.

5 is a schematic perspective view of a dressing unit according to the invention.

FIG. 6 is a cross-sectional view taken along the line VV of FIG. 5.

7 is a block diagram showing the configuration of a control unit.

<Description of main drawing code>

1: Spot welding robot 1a: Welding tip

2: welding tip grinding device 10: main frame

20: motor 20a: rotating shaft

30: dressing unit 31: drive gear

33: idle gear 35: grinding gear

35a: cutter 40: rotation detection sensor

40a: entrance 41: top plate

43: lower plate 45: rotating piece

50: control unit 51: rotational speed calculation unit

53: motor control unit 55: alarm control unit

60: clock part 70: alarm

The present invention relates to a welding tip polishing apparatus, and more particularly, a rotating piece is mounted on one surface of the polishing gear, and a rotation sensor is installed on one side of the dressing unit to detect the rotating state of the rotating piece. The present invention relates to a welding tip grinding device that can be accurately identified.

Spot welding is a metal plate that is stacked and electrodes are placed on top and bottom to allow current to flow and connect only one part. It is mainly used to make thin plate structures including automobile bodies, and spot welding robots with welding guns attached to the tip of arms are used.

The welding gun is installed so that a pair of welding tips face each other, and the welding tips apply high current while pressing the welding target, and the welding object is welded as heat is generated due to the high current. At this time, the higher the current density, the higher the heat generation, so that the welding tip is provided in a sharp shape to increase the current density.

However, after a certain time, the welding tip is worn out and the heat generation decreases, thereby increasing the defect rate during welding. In order to prevent such a phenomenon, the welding tip must be polished to maintain a sharp shape.

Conventionally, Patent Registration No. 10-9706548 "Welding Tip Polishing Device" has been proposed and used for polishing such a welding tip, and the installation and use state of such a welding tip polishing device is shown in FIG. 1.

As shown in FIG. 1, the welding tip polishing apparatus 200 according to the related art includes a motor 220 and a dressing unit 230 installed on a main frame 210, and the spot welding robot 100 includes a dressing unit. It is provided with a structure for polishing the welding tip 110 by using the abrasive gear 235 installed in (230).

At this time, one side of the dressing unit 230, the proximity sensor 240 is installed to check whether the grinding gear 235 is rotated.

Figure 2 is a schematic perspective view of a dressing unit according to the prior art, Figure 3 is a cross-sectional view taken along the line V-V of FIG.

As shown in FIGS. 2 to 3, the dressing unit 230 according to the related art has a box shape, a drive gear 231 and an idle gear 233 axially coupled to the rotating shaft 225 of the motor 220 in an inner space. ) And the abrasive gear 235 having the cutter 235a formed at the inner diameter portion are installed to be tooth-coupled with each other, and the idle gear 233 and the abrasive gear 235 rotate together with the rotation of the drive gear 231.

At this time, the proximity sensor 240 is installed on the side of the idle gear 233, the recess 233a or the convex portion 233b of the idle gear 233 is located in front of the proximity sensor 240, the convex portion 233b in the front The signal is detected only when is located to determine whether the idle gear 233 is rotated, and if the idle gear 233 is rotated, it is determined that the abrasive gear 235 is also rotated.

That is, the dressing unit 230 according to the related art checks whether the idle gear 233 is rotated using the proximity sensor 240, and whether the abrasive gear 235 is rotated according to whether the idle gear 233 is rotated. It was provided as a structure for judging.

However, in this method, the rotational force of the idle gear 233 is properly applied to the abrasive gear 235 when the abrasive gear 235 is worn out or when oil or foreign matter such as lubricant is present between the idle gear 233 and the abrasive gear 235. In this case, the proximity sensor 240 determines that the grinding gear 235 is rotating according to the rotation of the idle gear 233, but in reality, only the idle gear 233 is rotated, and the grinding gear 235 is rotated. May occur when it is stopped.

In addition, if the proximity sensor 240 is spaced too far from the idle gear 233, the accuracy is lowered. If the proximity sensor 240 is too close, friction occurs between the idle gear 233 and the proximity sensor 240, thereby damaging the proximity sensor 240. There was a problem.

In addition, the welding tip polishing apparatus 200 according to the related art has a problem in that it is impossible to precisely control the rotation speed because only the rotation of the polishing gear 235 can be determined.

The present invention has been made to solve the above problems, an object of the present invention is to install a rotating piece on one side of the polishing gear, and install a rotation sensor to detect the rotation state of the rotating piece on one side of the dressing unit, polishing An object of the present invention is to provide a welding tip grinding device that can accurately grasp the rotation state of a gear.

According to an aspect of the present invention for achieving the above object, a main frame, a motor installed on one side on the main frame, a drive gear installed on one side on the main frame, the shaft and the shaft coupled to the rotating shaft of the motor and the Dressing unit which is rotated in conjunction with the drive gear, the grinding gear is mounted to the inner diameter in the cutter, the rotating piece is mounted on one surface of the polishing gear to rotate together with the rotation of the polishing gear, one side of the dressing unit Is installed, the rotation detection sensor for outputting a rotation detection signal corresponding to the rotation of the rotating piece, the clock unit is provided on the other side of the main frame to provide visual information, an alarm installed on the other side of the main frame and the A control unit for controlling a rotation sensor, the motor, the clock unit and the alarm is provided.

Here, the rotation detection sensor is composed of an upper plate and a lower plate, it is preferable that the entrance and exit portion for entering and exiting the rotating piece between the upper plate and the lower plate.

In addition, the light emitting sensor is installed on one surface of any one of the upper plate and the lower plate and the light receiving sensor is installed at a position opposite to the light emitting sensor is further included.

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The controller may include a rotation speed calculator configured to calculate a rotation speed based on the rotation detection signal output from the rotation sensor and the time information provided from the clock unit, and the rotation speed and the reference rotation speed calculated from the rotation speed calculator. It is more preferable to include a motor control unit for controlling the motor in comparison with the rotation speed calculated from the rotational speed calculation unit and the alarm control unit for operating the alarm when it is outside the set tolerance range of the mirror.

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

Figure 4 is a perspective view showing the installation and use of the welding tip polishing apparatus according to the present invention.

As shown in FIG. 4, the welding tip polishing apparatus 2 according to the present invention has a dressing unit 30 for polishing the motor 20 and the welding tip 1a for providing power on the main frame 10. Take the structure that is installed.

The spot welding robot 1 places the welding tip 1a on one side of the dressing unit 30 and polishes the welding tip 1a using the polishing gear 35 to be described later.

At this time, in order to detect the rotation of the polishing gear 35, the rotating piece 45 is attached to the upper surface of the polishing gear 25, the rotation detection sensor 40 is installed on one side of the outer peripheral surface of the dressing unit 30.

5 is a schematic perspective view of the dressing unit according to the invention, and FIG. 6 is a cross-sectional view taken along the line V-V of FIG.

As shown in FIGS. 5 to 6, the dressing unit 30 according to the present invention has a box shape, and the driving gear 31, the idle gear 33, and the polishing gear 35 are tooth-coupled in the inner space. The rotation detection sensor 40 is installed near one side of the upper grinding gear 35, and openings are formed in the upper and lower portions of the grinding gear 35.

The drive gear 31 is axially coupled to the rotational shaft 20a of the motor 20 to be co-rotated as the motor 20 rotates, and the idle gear 33 is installed between the drive gear 31 and the polishing gear 35. To transmit torque.

The grinding gear 35 is for polishing the welding tip 1a, and the cutter 35a is provided at the inner diameters of the upper and lower surfaces, respectively, in order to polish the upper and lower welding tips 1a.

At this time, the above-described rotating piece 45 is mounted on the upper surface of the polishing gear 35 and rotates together with the rotation of the polishing gear 35. The rotating piece 45 is a double bent shape, and one side of the polishing piece is polished. The other side, which is mounted on the upper surface of the gear 35, is positioned above the dressing unit 30.

The rotation sensor 40 has an end portion of the upper plate 41 and the lower plate 43, and an entrance portion 40a is formed between the upper plate 41 and the lower plate 43.

Although not shown, a light emitting sensor is provided on a lower surface of the upper plate 41, and a light receiving sensor is provided on an upper surface of the lower plate 43.

At this time, the rotation sensor 40 is installed so that the other side of the above-described rotating piece 45 enters and leaves the entrance (40a).

When the grinding gear 35 is rotated by the driving of the motor 20, the rotary piece 45 is rotated together to enter and exit the entrance and exit portion 40a, and the rotary piece 45 is positioned between the light emitting sensor and the light receiving sensor. Each time the light transmitted from the light emitting sensor is not received by the light receiving sensor and outputs a signal corresponding to the rotation state of the polishing gear 35.

That is, since the welding piece polishing apparatus 2 according to the present invention directly determines whether the polishing gear 35 is rotated by using the rotating piece 45 mounted on the upper surface of the polishing gear 35, accurate determination is possible. Do.

7 is a block diagram showing the configuration of a control unit.

As shown in FIG. 7, in the related art, only the rotation of the polishing gear 35 may be determined, but the welding tip polishing apparatus 2 according to the present invention may not only rotate the polishing gear 35 but also the rotation speed and the rotation speed thereof. Measurement is possible and it is also possible to control the motor 20 based on the measured result or to operate the alarm 70 to be described later.

In order to perform such a function, the controller 50 takes a structure connected to the motor 20, the rotation sensor 40, the clock unit 60 providing time information, and the alarm 70 generating an alarm.

The controller 50 includes a rotation speed calculator 51, a motor controller 53, and an alarm controller 55.

The rotation speed calculation unit 51 receives the rotation detection signal output from the rotation detection sensor 40, receives the time information from the clock unit 60, and adjusts the rotation speed based on the received rotation detection signal and the time information. Calculate.

The motor controller 53 controls the motor 20 by comparing the rotation speed received from the rotation speed calculator 51 with a preset rotation speed.

The alarm manager 55 compares the rotation speed and the reference rotation speed received from the rotation speed calculator 51 to operate the alarm 70.

Referring to the operation of the welding tip polishing apparatus 2 under the control of the controller 50, the rotating piece 45 is rotated together with the rotation of the polishing gear 35, and the rotating piece 45 is rotated to sense the rotation. The rotation detection signal is output by entering and exiting the entrance and exit portion 40a of the sensor 40.

The rotation detection signal output from the rotation detection sensor 40 is transmitted to the rotation speed calculation unit 51, and the rotation speed calculation unit 51 is based on the received rotation detection signal and the time information received from the clock unit 60. Calculate the rotation speed.

The rotation speed calculator 53 transmits the calculated rotation speed to the motor controller 53 and the alarm controller 55, respectively.

The motor controller 53 controls the motor 20 by comparing the received rotational speed with a previously stored reference rotational speed. If the received rotational speed is faster than the reference rotational speed, the motor controller 53 controls the motor 20 to reduce the rotational speed. On the contrary, by increasing the rotation speed to maintain a constant rotation speed of the motor 20 to enable more precise polishing.

The alarm controller 55 compares the received rotational speed with the reference rotational speed and operates the alarm 70 when it is out of a preset allowable range.

According to the present invention as described above, the rotating piece is mounted on one surface of the polishing gear, and the rotation detection sensor for detecting the rotating state of the rotating piece on one side of the dressing unit has an effect of accurately grasp the rotating state of the polishing gear.

In addition, a motor control unit is connected between the motor and the rotational speed calculating unit, and the motor control unit controls the motor by comparing the rotational speed received from the rotational speed calculating unit with a preset rotational speed so that the rotational speed of the motor is maintained to be more precise. There is an effect that can be polished.

In addition, an alarm controller is connected between the alarm and the rotational speed calculator, and the alarm controller compares the rotational speed received from the rotational speed calculator with a preset rotational speed to operate the alarm, thereby promptly delivering the alarm to an administrator. .

Although the present invention has been described in connection with the above-mentioned preferred embodiments, it is possible to make various modifications or variations without departing from the spirit and scope of the invention. Accordingly, the appended claims will cover such modifications and variations as fall within the spirit of the invention.

Claims (5)

Main frame 10; A motor 20 installed on one side of the main frame 10; It is installed on one side on the main frame 10, the drive gear 31 and the drive gear 31 is axially coupled to the rotary shaft of the motor 20 is rotated in conjunction with the drive gear 31, the cutter 35a is mounted on the inner diameter portion A dressing unit 30 to which the abrasive gear 35 is installed; A rotating piece 45 mounted on one surface of the polishing gear 35 to rotate together with the rotation of the polishing gear 35; A rotation detection sensor (40) installed at one side of the dressing unit (30) and outputting a rotation detection signal corresponding to the rotation of the rotation piece (45); A watch unit 60 installed at the other side of the main frame 10 to provide time information; An alarm 70 installed at another side of the main frame 10; And Weld tip polishing apparatus comprising a control unit (50) for controlling the rotation sensor (40), the motor (20), the clock part (60) and the alarm (70). The method of claim 1, The rotation sensor 40 is composed of an upper plate 41 and the lower plate 43, the entrance and exit portion 40a that the rotating piece 45 enters and exits between the upper plate 41 and the lower plate 43. Weld tip grinding apparatus characterized in that the) is formed. The method of claim 2, A light emitting sensor installed on one surface of any one of the upper plate 41 and the lower plate 43; And Weld tip polishing apparatus further comprises a light receiving sensor installed at a position opposite to the light emitting sensor. delete The method of claim 1, The controller 50 is A rotation speed calculation unit 51 calculating a rotation speed based on the rotation detection signal output from the rotation detection sensor 40 and time information provided from the clock unit 60; A motor controller 53 for controlling the motor 20 by comparing the rotation speed calculated from the rotation speed calculation unit 51 with the reference rotation speed; And Weld tip grinding characterized in that it comprises an alarm controller 55 for operating the alarm 70 when the deviation from the set tolerance range of the mirror by comparing the rotation speed and the reference rotation speed calculated from the rotation speed calculation unit 51 Device.

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