JP2000059100A - Component suction device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a component suction equipment which is capable of surely detecting malfunctions and abnormalities in equipment or members related to suction of a component and surely mounting a component by properly breaking a vacuum pressure. SOLUTION: The pressures in a vacuum producing means and a part suction means 11 are each detected by pressure sensors 21 and 27 respectively, whereby the times required for the vacuum producing means and the part suction means to reach to target pressures or monitoring pressures are measured. When the target pressures or the required times vary from initial values, it is considered that the vacuum producing means 17 and 19, air pipings 16, 12, and 14 or an air filter 13 and the like are malfunctioning or operating abnormally, and failure analyses are carried out. When vacuum is broken, a vacuum breaking valve 22 is actuated to give a positive pressure. At this point, when a vacuum pressure is shut down, and a positive pressure is applied, a period of giving a positive pressure are regulated so as to optimize a vacuum breaking. With this constitution, failure analyses can be carried out, and a vacuum break can be optimized, so that components sure suction and mounting of are components realized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a component suction device, and more particularly, to a component suction device which sucks a component by a vacuum pressure generated by a vacuum pressure generating means and releases the component by breaking the vacuum pressure.

[0002]

2. Description of the Related Art Conventionally, an electronic component mounting machine (chip mounter) has been provided with a suction head having a suction nozzle for sucking an electronic component (hereinafter simply referred to as a component) such as an IC chip component. The supplied component is sucked by the suction nozzle, and is transferred and mounted on the circuit board. The component suction device is composed of a suction head or the like having a suction nozzle. The component is suctioned by vacuum pressure generated by descending along the Z axis (vertical axis) at the time of component suction, and the vacuum pressure at the time of component mounting. After the components are mounted on the substrate, the components rise along the Z-axis.

In this case, when components are mounted, it is necessary to instantaneously break the vacuum pressure and bring the inside of the nozzle to atmospheric pressure. If there is a vacuum pressure (residual pressure) when the Z-axis rises after mounting, the substrate will have poor adhesion and will be sucked up without mounting a small lightweight chip component. For this reason, as a method of eliminating the residual pressure and instantaneously releasing the atmospheric pressure, a method of instantaneously applying a positive pressure can be considered. The leaked air leaks and shifts normally mounted components around, which causes a problem.

Therefore, it is necessary to cut off the vacuum pressure, apply a positive pressure, and finely control the time for applying the positive pressure depending on the type of electronic component. As another method, there is a method in which the control time is fixed to a specified value and the pressure amount is adjusted by a speed controller on the pressure side.

In the case of the above method, the vacuum breaking state at the time of mounting changes due to a temporal decrease in the vacuum pressure generated by the vacuum generator, a decrease in the vacuum pressure due to clogging of the air filter, etc. May be reduced.

[0006]

As described above, when the air device or member related to the component suction, that is, the vacuum generating means breaks down or deteriorates, or the positive pressure is applied to break the vacuum. In this case, unless the pressurization start time or pressurization period is optimized, normal component mounting cannot be guaranteed.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made to solve such a problem, and it is possible to reliably detect a failure or abnormality of a device or a member related to component suction and to optimally destroy a vacuum pressure. It is an object of the present invention to provide a component suction device capable of mounting components reliably.

[0008]

According to the present invention, in order to solve the above-mentioned problems, a component which sucks a component by a vacuum pressure generated by a vacuum pressure generating means and releases the component by breaking the vacuum pressure is released. In a suction device, a first pressure detecting means for detecting a pressure on a vacuum pressure generating side, a second pressure detecting means for detecting a pressure on a component suction side, and the first and second pressures when a vacuum is generated or broken. Means for detecting a failure of a device or a member related to component suction based on the pressure detected by the detecting means.

According to another aspect of the present invention, there is provided a component suction device for sucking a component by a vacuum pressure generated by a vacuum pressure generating means and releasing the suction of the component by breaking the vacuum pressure. Measuring means for measuring the time from when the vacuum pressure is generated or broken until the pressure on the vacuum pressure generation side reaches a predetermined pressure and the time until the pressure on the component suction side reaches the predetermined pressure, and Means for detecting a failure of a device or a member related to component suction based on each time.

[0010] In any of the configurations, if there is a failure or abnormality in a device or a member related to component suction, for example, a vacuum generating means, an air pipe or an air filter, the ultimate pressure on the vacuum generating side and the component suction side changes. Or the time required for each side to reach a predetermined pressure (monitoring pressure) changes. By measuring the ultimate pressure on the vacuum generation side and the component suction side or the time required to reach the predetermined pressure, any part of the In addition, it is possible to reliably diagnose whether there is an abnormality.

According to another aspect of the present invention, there is provided a component sucking apparatus for sucking a component by a vacuum pressure generated by a vacuum pressure generating means and releasing the suction of the component by breaking the vacuum pressure. The vacuum pressure breaking means for breaking the vacuum pressure by applying a positive pressure, and the time from when the operation of the vacuum pressure generating means is stopped to the time when the vacuum pressure breaking means is operated until the pressure on the component suction side becomes a predetermined pressure. A measuring means for measuring is provided, and based on the measured time, the operation time of the vacuum pressure generating means, the operation time of the vacuum pressure breaking means, and the operation period thereof are optimized.

In such a configuration, the time when the vacuum pressure is cut off, the time when the positive pressure is applied, and the period for applying the positive pressure can be adjusted, so that the vacuum breakage can be optimized and the components can be reliably mounted.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.

FIG. 1 shows the configuration of an embodiment of a component suction device according to the present invention. In FIG. 1, reference numeral 10 denotes a nozzle holding portion for holding a suction nozzle. At the lower end of the holding unit 10, various suction nozzles 11 having different nozzle diameters are detachably held. A pipe 12 is formed in the nozzle holding unit 10, and the pipe 12 communicates with another pipe 14 and a pipe 15 in the suction nozzle 11 via an air filter 13. In addition, since the suction nozzle 11 is removed at the time of inspection, it is illustrated by a dashed line.

The pipe 12 of the nozzle holding section 10 has a pipe 16
Is connected to a vacuum generator (ejector) 17 via an air supply source 20 when a vacuum generation solenoid valve 19 controlled by a control device (CPU) 18 is turned on. It operates by the supplied compressed air to generate a negative pressure in the pipes 16, 12, 14, and 15.
Thus, the suction nozzle 11 can suction a component (not shown) at the lower end. When the component is normally sucked, the vacuum pressure is obtained, and when the component is not suctioned, the pressure does not become negative. It is input to the control device 18.

When the suction component is separated from the suction nozzle 11, the vacuum generating solenoid valve 19 is turned off, the vacuum generator 17 is stopped, and the vacuum is released. At this time, in order to quickly return to the atmospheric pressure after releasing the vacuum, the vacuum breaking solenoid valve 22 driven by the controller 18 is turned on to supply the positive pressure from the air supply source 20 to the pipe 16. .

Normally, the nozzle holding unit 10 and the suction nozzle 1
1. The vacuum generator 17, the vacuum generating solenoid valve 19, the vacuum breaking solenoid valve 22, and the pressure sensor 21 are attached to a suction head (not shown) of an electronic component mounting apparatus (chip mounter). The suction head is controlled by X
The component supplied from the feeder is moved by XY movement by the Y drive mechanism 23 and is sucked by the suction nozzle 11, and the component is mounted on the circuit board. When picking up and mounting components,
Similarly, the Z-axis elevating mechanism 24 controlled by the controller 18
Thus, the nozzle holding unit 10 and the suction nozzle 11 are controlled to move up and down.

In order to detect a failure of the air equipment,
Alternatively, a detection unit 28 including a detection post 25 and a pressure sensor 27 is provided in order to perform self-correction (optimization) at the time of vacuum break, and the pressure sensor 27 is provided in a pipe 26 formed in the detection post 25. The pressure is detected, and the data is transmitted to the control device 18. The control device 18
Is connected to a memory 29, which stores data for performing various controls, acquired or processed data, fixed data necessary for failure detection, self-correction, and the like.

The detection unit 28 is provided, for example, on a predetermined frame of the electronic component mounting apparatus.

Next, an operation for detecting a failure of the air device or performing a self-correction at the time of a vacuum break in the component suction device thus configured will be described with reference to FIG.

At the time of this failure detection or self-correction, the suction nozzle 11 is detached from the nozzle holding unit 10, and the suction head is moved XY to the place where the detection unit 28 is installed via the XY drive mechanism 23 (step S1). .
Subsequently, in step S2, the nozzle holding unit 10 is lowered via the Z-axis elevating mechanism 24, and lands on the detection post 28. The detection post 28 replaces the suction nozzle 11, and the landing detection post 28 is mounted on the nozzle holding unit 10 so that the pipes 15 and 26 communicate with each other.

Next, in step S3, the vacuum generating solenoid valve 19
Is turned on, the vacuum generator 17 has an air supply device 20
, And vacuum pressure is generated in the pipes 16 and 12. Thereby, the pipes 14, 2,
6, a vacuum pressure is also generated.

This state is shown in FIG. 3. When the vacuum generating solenoid valve 19 is turned on at t0, the pipes 16, 12,
Since a vacuum pressure is generated in the pressure sensors 14, 26,
27, the ultimate pressures P1 and P1 'are measured, and the times t1 and t2 to reach the monitoring pressure P2 are measured using a timer in the control device 18. The monitoring pressure P2 is stored in the memory 29
Is stored as a set value, so call it. Based on these data, a failure analysis of the air equipment as described below is performed in step S4. Note that the values of the ultimate pressures P1, P1 'when the air device is normal, the time t1,
It is assumed that the value of t2 is measured at the time of manufacture, for example, and stored in the memory 29 as an initial value. Similarly, a reference value with which each measured value described below is compared is also measured at the time of manufacture or the like, and stored in the memory 29 as an initial value.

If the ultimate pressure P1 of the pressure sensor 21 does not reach the initial value stored in the memory, a failure of the vacuum generator (ejector) 17 (for example, clogging of the nozzle) may be considered. Clean or replace. When the difference between P1 and P1 'is larger than the initial value of the difference, for example, it is possible that air leaks from the pipes 12 and 14, so that the parts are checked. If the difference between the times t2 and t1 is larger than the initial value of the difference, the air filter 13 may be dirty or clogged, and the air filter 13 is cleaned or replaced. Further, when the time t1 is larger than the initial value or varies with the number of measurements, the vacuum generating solenoid valve 19
Since the on-timing is delayed or the on-timing varies, the vacuum generating solenoid valve 19 is replaced.

After the above-described failure analysis is completed, the vacuum generating solenoid valve 19 is turned off in step S5, and a check is made at the time of vacuum breakdown (natural failure) in step S6 to perform failure analysis. FIG. 4 shows the state at the time of the vacuum break. When the vacuum generation solenoid valve 19 is turned off at t3, the vacuum pressure generated in the pipes 16, 12, 14, and 26 is destroyed, and the vacuum pressure measured by the pressure sensors 21 and 27 decreases to the atmospheric pressure. . Therefore, the monitoring pressure P
The times t4 and t5 until reaching 2 are measured using a timer in the controller 18.

The failure analysis is as follows. Measurement time t5
And the difference between t4 and t4 is greater than the initial value of the difference,
Since the air filter 13 may be dirty or clogged, the air filter 13 is cleaned or replaced. If the time t4 is larger than the initial value or varies at every measurement, the off-timing of the vacuum generating solenoid valve 19 is delayed or the off-timing varies. To

When step S6 is completed, the process returns to step S3, and this is repeated a plurality of times. This is to check the variation in the on (off) timing of the vacuum generating solenoid valve performed in step S4 (S6).

In steps S5 and S6, the vacuum generating solenoid valve 19 is turned off to perform a failure analysis. In this case, since the vacuum in each pipe is naturally broken, it takes time to return to the atmospheric pressure. It takes. Therefore, in order to reduce the time, a positive pressure is applied to break the vacuum. That is, in step S7, the vacuum generation solenoid valve 19
Is turned on to generate a vacuum pressure, and then turned off in step S8, the vacuum pressure is spontaneously destroyed. However, in order to reduce the time, the vacuum breaking solenoid valve 22 is turned on in step S9.
Is turned on to generate a positive pressure.

This state is shown in FIG. 5. When the vacuum generating solenoid valve 19 is turned off at t6 and then the vacuum breaking solenoid valve 22 is turned on at t7, a positive pressure is generated. The return slope increases. Then, at time t10, the vacuum breaking solenoid valve 22 is turned off (step S10). As a result, the positive pressure disappears, so that the pressure temporarily returns to the negative pressure side and returns to the atmospheric pressure. At this time, after the pressure ultimate pressures P3 and P3 'measured by the pressure sensors 21 and 27 and the vacuum breaking solenoid valve 22 are turned on (t7), the time t8 when the pressure sensors 21 and 27 measure the monitoring pressure P2, respectively. At t9, and after the vacuum break solenoid valve 22 is turned off (t10), the pressure sensors 21, 2
7 is the time t1 at which the ultimate pressures P3 and P3 'are measured.
1. Measure t12.

In step S11, a failure analysis is performed when the vacuum is broken by pressurization based on these measured values. First, when the difference between t8 and t7 is larger than the initial value of the difference, or when the variation of a plurality of times is large,
The delay in turning on the vacuum breaking solenoid valve 22 or the variation in the timing may be considered, so that the vacuum breaking solenoid valve 22 is replaced. When the difference between t11 and t10 is larger than the initial value of the difference, or when the variation is large a plurality of times, a delay in the OFF timing of the vacuum breaking solenoid valve 22 or a variation in the timing may be considered. The solenoid valve 22 is replaced.

Subsequently, in step S12, the self-correction of the vacuum break state is performed from the above measured values, and the initial value is updated. That is, the difference between t2 and t0, the difference between t5 and t3,
The difference between t9 and t7 and the difference between t12 and t10 are updated. Assuming that the monitoring pressure P2 is the limit pressure for component suction or suction release,
When the suction nozzle descends to the component along the Z axis for component adsorption, the monitoring pressure P2 must have been reached. Therefore, based on the updated difference between t2 and t0, the suction nozzle moves to the Z axis Vacuum generating solenoid valve 1 when in position
9 can be determined as to when it should be turned on. Further, when the suction nozzle is lowered to release the suction component on the board, and when the suction component is lowered to the board along the Z-axis, the monitoring pressure P2 must be reached. Therefore, based on the difference between the updated t5 and t3, , The suction nozzle is Z
The timing at which position on the shaft the vacuum generating solenoid valve 19 must be turned off can be determined. Similarly, when the vacuum is broken by applying a positive pressure, the timing for turning on the vacuum breaking solenoid valve is determined based on the difference between t9 and t7, or the vacuum breaking solenoid valve is turned off based on the difference between t12 and t10. Is determined, the pressurizing time is adjusted, and an optimal pressure value for mounting components can be obtained.

As described above, the above-mentioned initial values are updated by the self-correction performed in step S12, and the on / off timing of the vacuum generation (destruction) solenoid valve for optimizing the pressure applied to the component at the time of suction and release of the component is determined. Can decide. Steps S7 and S11 are repeated a plurality of times because the ON / OFF of the solenoid valve varies, and the average value is obtained to update the initial value. Step S12
Is completed, the Z-axis is raised in step S13,
Each process ends.

When a failure or abnormality is detected in the failure analysis, a warning is issued to urge the user to repair the failure or replace the device. After the maintenance, each initial value is reacquired and stored in the memory.

In the above process, the suction nozzle 1
Although the inspection is performed with the nozzle 1 removed, the inspection may be performed with the suction nozzle 11 attached. In this case,
The detection unit 28 includes a pressure sensor 27, and measures the pressure sensor 27 so as to close the suction surface of the suction nozzle.

In the above configuration, the vacuum generator 1
Although an ejector is used for 7, a vacuum generator such as a vacuum pump may be used. This embodiment is shown in FIG.
Is operated, a vacuum pressure is generated by the vacuum pump 30, and when the vacuum break solenoid valve 22 is operated by the control device 18, the positive pressure is increased by the air supply source 20 and the vacuum pressure is broken. .

[0036]

As described above, according to the present invention, the time required to reach a predetermined pressure is measured on each of the sides on which the ultimate pressures on the vacuum generating side and the component suction side are detected. Alternatively, it is possible to reliably diagnose which part of a device or a member related to the suction of components such as a destruction means, an air pipe or an air filter has a failure or abnormality, and it is ensured that the suction or release of the component is surely performed. You.

Further, according to the present invention, the time when the vacuum pressure is cut off, the time when the positive pressure is applied, and the period for applying the positive pressure can be adjusted, so that the vacuum breakage can be optimized and the component mounting can be ensured. The effect is obtained.

[Brief description of the drawings]

FIG. 1 is a block diagram showing the overall configuration of the device of the present invention.

FIG. 2 is a flowchart illustrating a process of performing a failure analysis or a self-correction of a vacuum break state.

FIG. 3 is a diagram showing the pressure on the vacuum generation side and the component suction side or the time required to reach a predetermined pressure on each side when a vacuum is generated.

FIG. 4 is a diagram showing the pressure on the vacuum generation side and the component suction side or the time required to reach a predetermined pressure on each side when the vacuum is broken.

FIG. 5 is a diagram showing the pressure on the vacuum generation side and the component suction side or the time required to reach a predetermined pressure on each side when vacuum is broken by applying a positive pressure.

FIG. 6 is a block diagram showing another embodiment for forming and breaking a vacuum pressure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Nozzle holding part 11 Suction nozzle 13 Air filter 17 Vacuum generator 18 Controller 19 Vacuum generation solenoid valve 20 Air supply source 21 Pressure sensor 22 Vacuum break solenoid valve 23 XY drive mechanism 24 Z-axis elevating mechanism 25 Detection post 27 Pressure sensor 28 Detection unit 29 Memory

Claims (4)

[Claims] 1. A component suction device for suctioning a component by a vacuum pressure generated by a vacuum pressure generating means and releasing the suction of the component by breaking the vacuum pressure, wherein a first pressure on a vacuum pressure generation side is detected. A pressure detecting means, a second pressure detecting means for detecting a pressure on the component suction side, and a device relating to the component suction based on the pressure detected by the first and second pressure detecting means when a vacuum is generated or broken. Means for detecting failure of a member. 2. A component suction device for sucking a component by a vacuum pressure generated by a vacuum pressure generating means and releasing the suction of the component by breaking the vacuum pressure, generating a vacuum pressure after generating or breaking the vacuum pressure. Measuring means for measuring the time until the pressure on the side reaches a predetermined pressure and the time until the pressure on the component suction side reaches the predetermined pressure, and a device or a device related to component suction based on the measured time. Means for detecting failure of a member. 3. The component suction apparatus according to claim 1, wherein the breaking of the vacuum pressure is performed by applying a positive pressure. 4. A component suction device for sucking a component by a vacuum pressure generated by a vacuum pressure generating means and releasing the suction of the component by breaking the vacuum pressure, wherein a vacuum for breaking a vacuum pressure by applying a positive pressure. Pressure rupture means, and measurement means for measuring the time from when the operation of the vacuum pressure generation means is stopped and the vacuum pressure rupture means is activated until the pressure on the component suction side reaches a predetermined pressure, wherein the measurement is performed. A component suction device characterized by optimizing, based on time, an operation stop time of a vacuum pressure generating means, an operation time of a vacuum pressure breaking means, and an operation period thereof.