JP2009200070A - Electronic component packaging apparatus - Google Patents

Abstract

[PROBLEMS] To enable the dynamic brake of a motor to be operated even in the event of a power failure or servo amplifier failure, and to easily rotate the rotating shaft of the motor by manual operation during maintenance work even if the braking force is large. Or an operating mechanism driven by a motor can be moved.
In a dynamic brake 20, a back electromotive force generated by a motor 2 is consumed by a resistor 22 by turning on a relay contact 23a. Thereby, a dynamic brake is acted. When the motor disconnect switch 36 is turned off, the dynamic brake can be released, and the rotating shaft of the motor can be easily rotated or the operation mechanism driven by the motor can be moved.
[Selection] Figure 1

Description

  The present invention relates to an electronic component mounting apparatus that operates a dynamic brake by consuming a back electromotive force generated by a motor, and in particular, operates a dynamic brake of a motor even when a power failure occurs or a servo amplifier fails. The present invention relates to an electronic component mounting apparatus capable of easily rotating a rotating shaft of a motor or moving an operation mechanism driven by a motor by manual operation during maintenance work even if the braking force is large. .

  In an electronic component mounting apparatus, a mounting head provided with a nozzle for sucking an electronic component to be mounted on a board is moved in the X-axis direction by an X-axis mechanism driven by an X-axis motor, and a Y-axis driven by a Y-axis motor. The mechanism moves the axis in the Y-axis direction. Further, the Z axis direction is moved in the Z axis direction by the Z axis mechanism portion in which the Z axis motor is mounted and the θ axis drive mechanism in which the θ axis motor is mounted.

  In many cases, a servo system is used for position control of these axis movements. Furthermore, one of the features of the servo system is a dynamic brake device.

  FIG. 9 is a circuit diagram showing an outline of a dynamic brake of a conventional electronic component mounting apparatus.

  In this figure, the control device 10 of the electronic component mounting apparatus includes a servo amplifier 12. The servo amplifier 12 includes a rectifier circuit 13, a main switch 14, an inrush current preventing element 15, a smoothing capacitor 16, and an inverter unit 17. In the servo amplifier 12, when the main switch 14 is turned on, the three-phase AC power input 1 from the outside is rectified by the rectifier circuit 13 and charged by the smoothing capacitor 16, thereby generating a DC voltage once. It is done. The DC voltage is converted into an AC voltage by the inverter unit 17 and supplied to the motor 2 so that the motor 2 is driven.

  The inverter unit 17 generally employs a PWM switching method, and an effort is made to keep power loss as low as possible. In the case of a servo system, the motor 2 is a servo motor.

  Next, the control device 10 of the electronic component mounting apparatus includes a dynamic brake 20. In general, the dynamic brake is a brake function that short-circuits the terminals of the servo motor via a resistor during a power failure or when the servo amplifier fails, and quickly stops the heat consumption of the rotational energy.

  In this figure, the dynamic brake 20 includes a relay 23 having a relay contact 23a which is turned off when the relay coil 23b is energized, and three resistors 22 for consuming rotational energy.

  During the operation of the motor 2, the relay coil 23b is energized, the relay contacts 23a are all turned off, and the dynamic brake of the motor 2 is not activated. On the other hand, when a power failure occurs or the servo amplifier fails, no current flows through the relay coil 23b, and the relay contacts 23a are all turned on, so that the dynamic brake of the motor 2 operates.

  Here, in Patent Document 1, in the inverter unit 17 of the servo amplifier 12, each phase transistor connected to the plus side of the smoothing capacitor 16 is turned on at a specific duty ratio, or each phase connected to the minus side. These transistors are turned on at a specific duty ratio so that the phase of the motor 2 is energized in the inverter unit 17 and the dynamic brake is operated with the inverter unit 17 as the center.

Japanese Patent Laying-Open No. 2007-37382 (FIG. 1)

  However, in order to increase the speed of the axis movement, a larger capacity servo motor is used. Then, in a general dynamic brake such as the one shown in FIG. 9, the braking force of the dynamic brake of the servo motor becomes stronger. Then, in a maintenance operation performed by shutting off the power supply of the entire apparatus, it is difficult to manually rotate the rotation shaft of the motor or move an operation mechanism driven by the motor. That is, since such work is performed against the braking force of the dynamic brake, it becomes more difficult as the braking force becomes stronger.

  In Patent Document 1, since the dynamic brake is performed while controlling the inverter unit 17, the dynamic brake does not act at all in the maintenance work performed with the power supply shut off as described above. So it ’s an advantage. However, in Patent Document 1, the dynamic brake cannot be operated even when a power failure occurs or a servo amplifier fails, which is usually a disadvantage.

  The present invention has been made to solve the above-described conventional problems, and can operate a dynamic brake of a motor even when a power failure occurs or a servo amplifier fails. Even if the braking force is large, maintenance work can be performed. It is an object of the present invention to provide an electronic component mounting apparatus that can easily rotate a rotating shaft of a motor or move an operation mechanism driven by the motor, sometimes by manual operation.

  The present invention relates to an electronic component mounting apparatus in which a dynamic brake is applied by consuming a back electromotive force generated by a motor, and a motor for interrupting a circuit through which the back electromotive force current flows when the dynamic brake is released. When the disconnection switch, the accidental operation prevention cover of the motor disconnection switch, the safety switch for detecting the open / close state of the erroneous operation prevention cover, and the open state of the erroneous operation prevention cover are detected by the safety switch The problem is solved by performing the safety control according to the detection.

  According to the present invention, in the electronic component mounting apparatus, when the XY axis mechanism is manually moved for the purpose of maintenance or the like, the dynamic brake function of the XY axis mechanism can be disabled and workability can be improved.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a circuit diagram showing an outline of a dynamic brake of an electronic component mounting apparatus according to an embodiment to which the present invention is applied.

  Comparing this figure with the above-mentioned FIG. 9, the present embodiment is provided with a motor disconnection switch 36 as compared with the conventional example. The motor disconnect switch 36 is provided between the motor 2 and the dynamic brake 20, and can be cut off by operating it off when releasing the operation of the dynamic brake.

  At the time of maintenance work, when rotating the rotating shaft of the motor 2 or moving the operation mechanism driven by the motor 2 by manual operation, first, in order to release the dynamic brake operation of the motor 2, The motor disconnect switch 36 is turned off. Then, the motor 2 and the dynamic brake 20 can be disconnected, and the dynamic brake 20 does not work.

  Therefore, even if the braking force of the motor 2 by the dynamic brake 20 is large, it is possible to easily rotate the rotating shaft of the motor or move the operating mechanism driven by the motor by manual operation during maintenance work. .

  FIG. 2 is a perspective view showing an outline of the entire electronic component mounting apparatus of the present embodiment.

  This figure shows the entire electronic component mounting apparatus 5 as viewed from the left rear side of the electronic component mounting apparatus 5. In addition, the switch box 50 in which the motor disconnect switch 36 described above is housed is provided on the lower left side on the side surface of the electronic component mounting apparatus 5 as shown by a broken line.

  FIG. 3 is a perspective view showing the switch box 50 of the electronic component mounting apparatus according to the present embodiment. FIG. 4 is a front view of the switch box 50 in a state where the operation unit slide door 55 is closed in the present embodiment. FIG. 5 is a front view of the switch box 50 in a state where the operation unit slide door 55 is opened.

  First, in FIG. 3, the front mounting bracket 52 of the switch box 50 is mounted on the rear surface of the electronic component mounting apparatus 5, and the left mounting bracket 53 is mounted on the right surface of the electronic component mounting apparatus 5. As described with reference to FIG. 2, the switch box 50 is attached to the lower left side of the side surface of the electronic component mounting apparatus 5.

  The switch box 50 is provided with an operation unit slide door 55. The operation portion slide door 55 corresponds to the erroneous operation prevention cover of the present invention.

  Normally, as shown in FIG. 4, the operation unit slide door 55 is slid to the right side, so that the motor disconnect switch 36 is stored so as not to be inadvertently operated. Further, the detected member 35 integrated with the operation unit slide door 55 of the slide is inserted into the door closing safety switch 34 when the operation unit slide door 55 is slid to the right side. The door closing safety switch 34 corresponds to the safety switch of the present invention.

  Alternatively, when operating the motor disconnect switch 36, as shown in FIG. 5, the operation unit slide door 55 is slid to the left to expose the motor disconnect switch 36. Further, the detected member 35 integral with the slide operation unit slide door 55 is extracted from the door closing safety switch 34 when the operation unit slide door 55 is slid to the left.

  In the present embodiment, the front mounting bracket 52 is provided with a stopper bracket 56 on the upper left side of the window portion where the motor disconnect switch 36 is desired. The stopper fitting 56 is provided with a bolt hole 57 so that the operation portion slide door 55 slid to the right and closed can be screwed with a bolt inserted from the bolt hole 57.

  Therefore, when operating the motor disconnect switch 36 to release the dynamic brake, first remove the bolt in the bolt hole 57 with a hexagon wrench, and then slide the operating portion slide door 55 to the left. Thus, the motor disconnect switch 36 can be seen from the window portion of the front mounting bracket 52.

  Thus, by operating the motor disconnect switch 36 by using some tool, the motor disconnect switch 36 can be easily disabled. As a result, the danger caused by careless operation can be reduced and safety can be improved.

  FIG. 6 is an enlarged view showing the structure of the door closing safety switch 34 in the present embodiment when the operation unit slide door 55 is closed.

  This figure is an enlarged view of the vicinity of the door closing safety switch 34 in FIG. The detected member 35 that slides integrally with the operation unit sliding door 55 is inserted into the door closing safety switch 34. When the door closing safety switch 34 detects the insertion of the member 35 to be detected, the door closing safety switch 34 is turned on.

  Next, FIG. 7 is an enlarged view showing the structure of the door closing safety switch 34 when the operation unit slide door 55 is opened.

  This figure is an enlarged view of the vicinity of the door closing safety switch 34 in FIG. The detected member 35 that slides integrally with the operation portion sliding door 55 is not inserted into the door closing safety switch 34 in FIG. In this state, the door closing safety switch 34 is turned off.

  FIG. 8 is a circuit diagram relating to the safety control device according to the present embodiment.

  In this embodiment, when the motor disconnection switch 36 is provided by applying the present invention, the door closing safety switch 34 is provided and connected, and the setting wiring 33 is disconnected as shown in FIG. Then, the door closing safety switch 34 is in series with an emergency stop switch 32 that is generally provided, and is input to the safety control device 30.

  Since the emergency stop switch 32 and the door closing safety switch 34 are both on during normal operation of the electronic component mounting apparatus, an ON (logical product) of these switches is input to the safety control apparatus 30. Become. Alternatively, when the emergency stop switch 32 is operated and turned off, or when the operation unit sliding door 55 is opened and the door closing safety switch 34 is turned off, the safety control device 30 is turned off.

  As described above, when OFF is input to the safety control device 30, the safety control device 30 stops the operation of the electronic component mounting device 5. For example, the main switch 14 of the servo amplifier 12 is turned off to stop the shaft movement, and the relay contact 23a is turned on to activate the dynamic brake 20.

The circuit diagram which shows the outline of the dynamic brake of the electronic component mounting apparatus of embodiment with which this invention was applied The perspective view which shows the outline | summary of the whole electronic component mounting apparatus of the said embodiment. The perspective view which shows the switch box of the electronic component mounting apparatus of the said embodiment. The front view of the switch box in the state which closed the operation part slide door in the said embodiment. Front view of the switch box with the operation unit slide door open Enlarged view of the vicinity of the door closing safety switch when the operation unit slide door is closed in the embodiment. Enlarged view of the vicinity of the door closing safety switch with the operation unit sliding door open Circuit diagram related to the safety control device in the embodiment The circuit diagram which shows the outline of the dynamic brake of the conventional electronic component mounting equipment

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... AC power supply input 2 ... Motor 5 ... Electronic component mounting apparatus 10 ... Control apparatus 13 ... Rectifier circuit 14 ... Main switch 15 ... Inrush current prevention element 16 ... Smoothing capacitor 17 ... Inverter part 20 ... Dynamic brake 22 ... Resistance 23a ... Relay contact 23b ... Relay coil 30 ... Safety control device 32 ... Emergency stop switch 33 ... Setting wiring 34 ... Door closing safety switch 35 ... Detected member 36 ... Motor disconnection switch 50 ... Switch box 52 ... Front mounting bracket 53 ... Left side Mounting bracket 55 ... Operation unit sliding door 56 ... Stopper bracket 57 ... Component mounting operation control unit

Claims (1)

In an electronic component mounting device that operates a dynamic brake by consuming counter electromotive force generated by a motor,
A motor disconnect switch for interrupting a circuit through which the current of the back electromotive force flows when releasing the dynamic brake;
A cover for preventing erroneous operation of the motor disconnect switch;
A safety switch for detecting the open / closed state of the erroneous operation prevention cover;
An electronic component mounting apparatus, wherein when the open state of the erroneous operation prevention cover is detected by the safety switch, safety control is performed according to the detection.

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