JP2009061351A - Continuous pressurization inhibiting method and apparatus for pressurizing mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To restore atmospheric pressure by lowering pressure by hard ware regardless of a control apparatus in abnormality. <P>SOLUTION: In the case of controlling pressure increase or decrease for a single space where spontaneous gas discharge is not carried out by using a two-port solenoid valve having a pressurizing valve 12 and a pressure-reducing valve 14, continuation of the pressurizing state for a prescribed time or longer is detected, and when the pressurizing state continues for the prescribed time or longer, the pressurization is stopped and the space is opened to atmospheric pressure. <P>COPYRIGHT: (C)2009,JPO&amp;INPIT

Description

  The present invention relates to a continuous pressurization preventing method and apparatus for a pressurizing mechanism, and in particular, an adhesion to an electronic component in an upstream process of an electronic component mounting apparatus (referred to as a mounter) used when mounting the electronic component on a substrate or the like. Continuous pressurization of the pressurization mechanism, suitable for use in devices that are in trouble if the pressurization state is continued when an abnormality occurs in the control device, such as an adhesive application device (referred to as a dispenser) that applies an agent The present invention relates to a prevention method and apparatus.

  In air pressure control, it is a common practice to move an actuator by increasing or decreasing pressure. For example, in a dispenser, adhesive is discharged from a cylinder.

  As illustrated in FIG. 1, when the pressure from the CPU 10 is controlled by a two-port electromagnetic valve having a pressurizing valve 12 and a pressure reducing valve 14 in accordance with a signal from the CPU 10 and sealed so that natural exhaust does not occur, Three states of pressurization, decompression, and fixation can be created by operating the solenoid valve. However, if the control that repeats the pressurization / decompression state for a certain period of time fails, an undesired state, for example, the pressurization state May cause damage to the dispenser, such as cylinder protrusion and adhesive spillage.

  On the other hand, Patent Document 1 describes a method of monitoring a CPU runaway (hangup) with a watchdog circuit and resetting it to restore the CPU runaway.

JP-A-5-20289

  However, even in the technique of Patent Document 1, an undesired state is continued when the time from the reset to the start-up or when it does not start normally. In addition, since the pressure increase / decrease depends on the control device, if the control stops due to hang-up, the subsequent safety cannot be achieved, and problems such as cylinder protrusion in the dispenser and adhesive spillage can be prevented. could not.

  The present invention has been made to solve the above-described conventional problems, and it is an object of the present invention to reduce the pressure to hardware and return it to the atmospheric pressure in the event of an abnormality regardless of the control device.

  In the present invention, when pressurization control is performed using a two-port solenoid valve for one space that is not naturally exhausted, if the pressurization state continues for a certain time or longer, pressurization is stopped and the atmosphere is released. This solves the problem.

  The present invention also provides a means for detecting that a pressurization state has continued for a predetermined time or more in a pressurization mechanism that performs pressurization control using a two-port solenoid valve for one space that is not naturally exhausted. And a means for stopping the pressurization and releasing the atmosphere when the pressure state continues for a predetermined time or more.

  According to the present invention, by assembling the device with a hardware configuration, even if the pressure increase / decrease is away from the control and the state is not desired, the actuator can return to the normal (atmospheric pressure) state, Abnormal conditions can be prevented from continuing.

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

  In this embodiment, as shown in FIG. 2, a continuous pressurization preventing circuit 20 according to the present invention is inserted between the CPU 10 and the valves 12 and 14.

  As shown in detail in FIG. 3, the continuous pressurization prevention circuit 20 includes frequency dividers 22 and 32 that divide the clock signal CLK, an inverter 24 that inverts the pressurization signal input from the CPU 10, An abnormality detection counter 26 for counting the duration of the pressurization signal, an abnormality detection latch 28 for holding the output of the abnormality detection counter 26, a pressurization signal input from the CPU 10 and the abnormality detection latch 28 AND gate 30 for outputting the logical product of the outputs to the pressurizing valve 30, a decompression time counter 34 for counting the decompression (atmospheric release) time, and a decompression time latch 36 for holding the output of the decompression time counter 34 The inverter 38 for inverting the output of the abnormality detection latch 28, and the logic of the output of the abnormality detection latch 28 and the decompression (atmospheric release) signal input from the CPU 10. , An AND gate 42 that outputs a logical product of the output of the decompression time latch 36 and the output of the inverter 38, and an OR gate 44 that outputs the logical sum of the AND gates 40 and 42 to the decompression valve 14. It is comprised including.

  Here, a control configuration in which pressurization is performed by the Low signal is shown, but it is also possible to cope with the High signal by inverting each logic.

  The continuous pressurization preventing device of this embodiment can detect an abnormality by the abnormality detection counter 26, and can perform pressure reduction (exhaust) after the abnormality for a predetermined time by the pressure reduction time counter.

  That is, as illustrated in FIG. 4, when a pressurization signal is input from the CPU 10, the clear terminal CL of the abnormality detection counter 26 is disabled, and the abnormality detection counter 26 starts counting. When normally controlled, the pressurization is released in a certain time, so that the clear terminal CL is enabled and the abnormality detection counter 26 is reset.

  On the other hand, when a malfunction occurs and the pressurization signal is not released, when the abnormality detection counter 26 performs a certain count, the signal output from the output terminal Q * serves as a trigger, and the abnormality detection latch 28 operates to activate the high level. A signal is output. By the output signal, all pressurization signals are ignored and pressurization is stopped.

  On the other hand, exhaust continues until the decompression time counter 34, which receives the output of the abnormality detection latch 28 and the clear terminal CL is disabled, performs a constant count and sends a trigger to the decompression time latch 36.

  Here, the counters 26 and 34 for detecting the abnormality and determining the decompression time can be set to an arbitrary cycle by the original clock signal CLK and the frequency dividers 22 and 32.

  Thus, when the pressurization signal continues due to the hang-up of the CPU 10 or the control software, the pressurization signal is forcibly stopped in order not to adversely affect the actuator 16. In order to release the pressure, a decompression (atmospheric release) signal is output.

  In addition, in the said description, although the case where this invention was applied to a dispenser was demonstrated, it is clear that the application object of this invention is not limited to this, but can apply similarly to a pressurization mechanism generally. .

Block diagram showing the configuration of an example of a pressurizing mechanism using a 2-port solenoid valve The block diagram which shows the whole structure of embodiment of the pressurization mechanism to which this invention was applied. A circuit diagram showing details of the continuous pressurization prevention circuit Time chart showing operation of the embodiment

Explanation of symbols

10 ... CPU
DESCRIPTION OF SYMBOLS 12 ... Pressurization valve 14 ... Pressure reducing valve 16 ... Actuator 20 ... Continuous pressurization prevention circuit 26 ... Abnormality detection counter 28 ... Abnormality detection latch 34 ... Decompression time counter 36 ... Decompression time latch

Claims (2)

When controlling pressure increase / decrease using a 2-port solenoid valve for one space that is not naturally exhausted,
A method of preventing continuous pressurization of a pressurization mechanism, wherein pressurization is stopped and the atmosphere is released when the pressurization state continues for a predetermined time or more. In a pressurizing mechanism that controls pressure increase / decrease using a two-port solenoid valve for one space that is not naturally exhausted,
Means for detecting that the pressurized state has continued for a certain period of time;
When the pressurization state continues for a certain time or more, means for stopping the pressurization and releasing to the atmosphere;
An apparatus for preventing continuous pressure application of a pressurizing mechanism.

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