JP4816624B2 - Electronic component mounting apparatus and nozzle presence / absence detection method - Google Patents

Description

  The present invention relates to an electronic component mounting apparatus that mounts an electronic component on a substrate by a suction nozzle that is detachably mounted on the mounting head, and a nozzle presence / absence detection method that detects the presence or absence of the suction nozzle in the mounting head in the electronic component mounting apparatus. is there.

As a method of holding an electronic component in an electronic component mounting apparatus that mounts the electronic component on a substrate, a method using vacuum suction is used. In this method, the electronic component is held by using the negative pressure generated by vacuum suction from the suction hole in a state where the suction nozzle having the suction hole provided at the lower end is in contact with the upper surface of the electronic component. is there. When mounting the electronic component held by the suction nozzle on the substrate, the electronic component is detached from the suction nozzle by releasing the vacuum suction. In general, the type and size of the suction nozzle varies depending on the electronic component to be sucked, and is replaced and mounted according to the suction target. Therefore, the suction nozzle is conventionally mounted on the mounting head as an electronic component mounting device. One having a nozzle presence / absence detection function for detecting whether or not it is present is known (see Patent Document 1). In the prior art example shown in Patent Document 1, whether or not the suction nozzle is mounted based on the measurement result of the degree of vacuum obtained by the vacuum degree measuring means provided in the circuit from the suction hole mounting hole to the vacuum suction source Is determined.
JP 2001-230599 A

  However, the above prior art examples have the following problems due to the determination method of the presence or absence of the suction nozzle. In other words, the nozzle presence / absence detection may continuously monitor the presence / absence of the nozzle by operating the detection function continuously for a long time in the operating state of the apparatus. In such a case, vacuum suction is performed from the suction nozzle for a long time. Continued execution. For this reason, fine foreign matter sucked through the suction nozzle easily accumulates in the vacuum suction circuit, resulting in early clogging of the filter attached to the vacuum suction circuit.

  Also, when it is necessary to replace the suction nozzle within such a monitoring time, a suction force is acting on the suction nozzle, so a large force is required to separate the suction nozzle from the mounting head, The result was that extra time was required for the nozzle removal work at the time of replacement. As described above, the conventional technique has the above-described disadvantages due to the detection of the presence or absence of the suction nozzle based on the measurement result of the degree of vacuum.

  SUMMARY OF THE INVENTION An object of the present invention is to provide an electronic component mounting apparatus and a nozzle presence / absence detection method capable of eliminating the disadvantages that occur when the presence / absence of a nozzle is detected based on the measurement result of the degree of vacuum during vacuum suction.

  The electronic component mounting apparatus of the present invention is an electronic component mounting apparatus that picks up an electronic component from a component supply unit by vacuum suction using a suction nozzle that is detachably mounted on a mounting head, and mounts the electronic component on a substrate. An air blow unit that discharges positive pressure air, a flow sensor that is interposed in an air blow circuit from the air blow unit to the suction nozzle and measures the flow rate of positive pressure air flowing through the air blow circuit, and a flow measurement result by the flow sensor And a determination unit for determining the presence or absence of the suction nozzle in the mounting head.

The nozzle presence / absence detection method of the present invention is an electronic component mounting apparatus that picks up an electronic component from a component supply unit by vacuum suction using a suction nozzle that is detachably mounted on the mounting head, and mounts the electronic component on a substrate. A nozzle presence / absence detection method for detecting the presence / absence of a nozzle, wherein the electronic component mounting apparatus is interposed in an air blow means for discharging positive pressure air from the suction nozzle and an air blow circuit extending from the air blow means to the suction nozzle. A flow rate sensor for measuring the flow rate of positive pressure air flowing through the air blow circuit, and measuring the flow rate of air flowing through the air blow circuit by the flow rate sensor while driving the air blow means to discharge positive pressure air. The presence of the suction nozzle in the mounting head based on the flow rate measurement result by the sensor. The judges.

  According to the present invention, the flow rate of the air flowing through the air blow circuit is measured by the flow sensor interposed in the air blow circuit while driving the air blow means to discharge positive pressure air, and the air flow is mounted based on the flow measurement result by the flow sensor. By adopting a method for determining the presence / absence of the suction nozzle in the head, it is possible to eliminate the inconvenience that occurs when the presence / absence of nozzle mounting is detected based on the measurement result of the degree of vacuum during vacuum suction.

  Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a plan view of an electronic component mounting apparatus according to an embodiment of the present invention, FIG. 2 is a diagram showing a cover arrangement of the electronic component mounting apparatus according to an embodiment of the present invention, and FIG. 3 is an embodiment of the present invention. 4 is a diagram showing a configuration of a mounting head of the electronic component mounting apparatus according to the embodiment, FIG. 4 is an explanatory diagram of the reading operation of the identification information of the suction nozzle in the electronic component mounting apparatus according to the embodiment of the present invention, and FIG. FIG. 6 is a block diagram showing the configuration of the vacuum suction / air blow circuit of the electronic component mounting apparatus according to the embodiment, FIG. 6 is an explanatory diagram of detecting whether or not the suction nozzle is mounted in the electronic component mounting apparatus according to the embodiment of the present invention, and FIG. FIG. 8 is a block diagram showing a configuration of a control system of an electronic component mounting apparatus according to an embodiment of the present invention, and FIG. 8 is a flowchart showing automatic suction nozzle mounting history update processing in the electronic component mounting apparatus according to an embodiment of the present invention. FIG. 9 shows an embodiment of the present invention. It is a diagram showing a display screen in the electronic component mounting apparatus of the state.

  First, the structure of the electronic component mounting apparatus will be described with reference to FIG. In FIG. 1, a substrate transport mechanism 2 is disposed in the center of the base 1 in the X direction. The substrate transport mechanism 2 transports the substrate 3 and positions the substrate 3 on the component mounting stage set in the substrate transport mechanism 2. Component supply units 4 are arranged on both sides of the substrate transport mechanism 2, and a plurality of tape feeders 5 are arranged in parallel in each component supply unit 4. The tape feeder 5 stores electronic components held on the tape, and pitches the tape to supply the electronic components to a pickup position by a mounting head described below.

  Y-axis tables 6A and 6B are disposed on both ends of the upper surface of the base 1, and two X-axis tables 7A and 7B are installed on the Y-axis tables 6A and 6B. By driving the Y-axis table 6A, the X-axis table 7A moves horizontally in the Y direction, and by driving the Y-axis table 6B, the X-axis table 7B moves horizontally in the Y direction. Mounted on the X-axis tables 7A and 7B are a mounting head 8 and a substrate recognition camera 9 that moves integrally with the mounting head 8, respectively. The substrate recognition camera 9 that has moved onto the substrate 3 captures and recognizes the substrate 3. The recognition result is recognized by the recognition processing unit 36 (see FIG. 7), whereby the position of the substrate 3 is recognized.

By driving the Y-axis table 6A, the X-axis table 7A, the Y-axis table 6B, and the X-axis table 7B in combination, the mounting head 8 moves horizontally, and the suction nozzle 20 (see FIG. 3), the electronic components are picked up from the respective component supply units 4 by vacuum suction and mounted on the substrate 3 positioned on the component mounting stage of the substrate transport mechanism 2. The Y-axis table 6A, the X-axis table 7A, the Y-axis table 6B, and the X-axis table 7B are a head moving mechanism (see the head moving mechanism 35 shown in FIG. 7) that moves the mounting head 8 together with the substrate recognition camera 9. Constitute.

  A component recognition camera 10 and a nozzle stocker 11 are disposed on the path from the component supply unit 4 to the substrate transport mechanism 2. The nozzle stocker 11 stores and holds suction nozzles 20 corresponding to different types of electronic components, and the mounting head 8 accesses the nozzle stocker 11 to perform a nozzle mounting operation. The suction nozzle 20 housed in is attached. When the mounting head 8 with the suction nozzle 20 already mounted is accessed to the nozzle stocker 11, the nozzle mounting operation is performed after the nozzle removal operation for removing the already mounted suction nozzle 20 is performed. The previously installed suction nozzle 20 can be replaced with another suction nozzle.

  The component recognition camera 10 images the electronic component held by each mounting head 8 from below. By recognizing the imaging result by the recognition processing unit 36 (see FIG. 7), the electronic component held by the suction nozzle 20 can be recognized. Thereby, the posture of the electronic component held by the suction nozzle 20 is inspected. That is, a positional shift in the XY direction and the rotation direction with respect to the suction nozzle 20 of the electronic component is detected. When the electronic component is transferred and mounted on the substrate 3 by the mounting head 8, the posture of the electronic component is corrected based on the inspection result and mounted on the substrate.

  FIG. 2 shows an external view and cover arrangement of the electronic component mounting apparatus. As shown in FIG. 2 (a), this electronic component mounting apparatus is provided with a fixed cover member 12 except for a portion corresponding to the component supply unit 4 and a range of a cover door 13 provided for accessing the inside of the apparatus. The operating range of the mounting head 8 is enclosed. The substrate transport mechanism 2 protrudes in the horizontal direction through a transport opening provided in the cover member 12 on both side surfaces in the X direction.

  An operation unit 14 for a machine operator to operate the apparatus is provided on one side of the cover door 13, and an operation panel 15 and a display panel 16 are disposed on the operation unit 14. The operation panel 15 is provided with operation buttons and input keys. When a machine operator operates these operation buttons and input keys, an operation command for operating the device and various data input are performed. The display panel 16 is a display device such as a liquid crystal panel, and displays a guidance screen at the time of operation input and a notification screen at the time of abnormal operation.

  As shown in FIG. 2B, the cover door 13 can be opened and closed up and down, and when the cover door 13 is opened, a work opening 12a that is not enclosed by the cover member 12 is secured on the side of the apparatus. Thus, the machine operator can inspect and perform maintenance work inside the apparatus through the work opening 12a. A door opening / closing detection sensor 13a for detecting the opening / closing state of the cover door 13 is provided inside the work opening 12a. In the state where the cover door 13 is pivoted upward and opened, the door opening / closing detection sensor is provided. A signal indicating that the cover door 13 is in an open state is output from 13a to the open / close detection unit 37 (see FIG. 7). The door opening / closing detection sensor 13 a and the opening / closing detection unit 37 constitute a cover door 13 that closes the operating range of the mounting head 8 and an opening / closing detection means that detects opening / closing of the cover door 13.

  Next, the mounting head 8 will be described with reference to FIG. As shown in FIG. 3, the mounting head 8 is multi-type, and has a configuration including a plurality of unit mounting heads 8a. Each of the unit mounting heads 8a is provided with a suction nozzle 20 that sucks and holds an electronic component at the lower end portion, and can be moved up and down individually. The suction nozzle 20 is detachably mounted on a nozzle mounting portion 8b provided below the unit mounting head 8a according to the type of electronic component.

  The suction nozzle 20 is provided with a disk-like flange portion 20b below a fitting portion 20c shaped to fit in a mounting hole (see the mounting hole 8c shown in FIG. 6B) provided in the nozzle mounting portion 8b. Further, the nozzle shaft 20a is extended downward from the flange portion 20b. The lower surface of the flange portion 20b has a function of reflecting downward the illumination light irradiated from below during imaging by the component recognition camera 10. An adsorption hole 20d (see FIG. 5) is opened at the lower end of the nozzle shaft 20a, and the electronic component is adsorbed and held by the lower end surface of the nozzle shaft 20a by vacuum suction from the adsorption hole.

  A two-dimensional barcode label 21 is attached to the upper surface of the flange portion 20b, and identification information for identifying the suction nozzle 20 is applied to the two-dimensional barcode label 21. When the suction nozzle 20 is mounted on each unit mounting head 8 a of the mounting head 8, the suction nozzle 20 is previously imaged by the substrate recognition camera 9 from above in the nozzle stocker 11. The identification information of the suction nozzle 20 is read by recognizing the image of the two-dimensional barcode label 21 captured by the imaging by the recognition processing unit 36 (see FIG. 7).

  That is, here, the barcode applied by the two-dimensional barcode label 21 is used on the upper surface side of the suction nozzle 20 as means for giving the identification information, and the substrate recognition camera 9 provided integrally with the mounting head 8. Is an identification information reading unit for reading the identification information given to the suction nozzle. This identification information is used for checking the correctness of the tool whether or not the suction nozzle 20 is an appropriate type of nozzle corresponding to the component type to be executed, and the acquired identification information is used as nozzle mounting history data. By memorizing, it becomes possible to ensure traceability in quality control. As means for applying the identification information, the suction nozzle 20 is equipped with an RF tag, and the mounting head 8 is equipped with a reader / writer for writing / reading data to / from the RF tag as the identification information reading section. Also good. Further, identification information such as a two-dimensional barcode may be imprinted on the upper surface side of the suction nozzle 20.

  Next, with reference to FIG. 4, the operation of moving the mounting head 8 to the nozzle stocker 11 and mounting the suction nozzle 20 on the unit mounting head 8a will be described. The nozzle stocker 11 includes a mounting table 11 a for mounting the suction nozzle 20. A storage hole 11 b for storing the suction nozzle 20 is provided in the mounting table 11 a of the unit mounting head 8 a in the mounting head 8. It is provided corresponding to the arrangement pitch. Here, an example of operation when the suction nozzle 20 is newly attached to each unit mounting head 8a to which the suction nozzle 20 is not attached is shown.

  First, as shown in FIG. 4A, the mounting head 8 is moved above the nozzle stocker 11, and the substrate recognition camera 9 is positioned above the suction nozzle 20 * to be mounted. In this state, when the suction nozzle 20 * is imaged by the substrate recognition camera 9, an image of the two-dimensional barcode label 21 that is attached in advance to the upper surface of the flange portion 20b shown in FIG. 3 is captured. Then, the image data is subjected to recognition processing by the recognition processing unit 36, whereby the identification information of the suction nozzle 20 * is read.

  Thereafter, as shown in FIG. 4B, the mounting head 8 is moved so that the unit mounting head 8a to be mounted is positioned above the suction nozzle 20 * from which the identification information has been read, and the nozzle mounted on the unit mounting head 8a. Execute the mounting operation. Thereby, the nozzle mounting portion 8b is lowered (arrow a), the fitting portion 20c is fitted into the fitting hole 8c, and the nozzle mounting is completed. Thereafter, as shown in FIG. 4C, the nozzle mounting portion 8b is raised (arrow b), whereby the mounting process of the suction nozzle 20 to the unit mounting head 8a is completed. In this way, each time the suction nozzle 20 is mounted on the individual unit mounting heads 8a constituting the mounting head 8, the substrate recognition camera 9 reads the two-dimensional barcode label 21 to thereby check the above-described tool correctness / incorrectness. Is reliably performed, and nozzle mounting history data can be acquired.

  In the case where a plurality of suction nozzles 20 are simultaneously mounted on each unit mounting head 8a, the plurality of suction nozzles 20 to be mounted are first sequentially imaged by the substrate recognition camera 9 prior to the nozzle mounting operation, and a two-dimensional bar code. The label 21 may be read in advance, and thereafter the operation of mounting the suction nozzle 20 on the nozzle mounting portion 8b may be performed. FIG. 4 shows an example of operation when the suction nozzle 20 is newly attached to the unit mounting head 8a to which the nozzle is not attached. However, in the unit mounting head 8a with the suction nozzle 20 already attached, Similarly, in the nozzle replacement operation in which the suction nozzle 20 is replaced with another type of suction nozzle 20, the substrate recognition camera 9 reads the two-dimensional barcode label 21. In this case, after the already mounted suction nozzle 20 is detached from the nozzle mounting portion 8b and placed on the placement table 11a, each operation shown in FIG. 4 is executed.

  Next, a configuration of a vacuum suction / air blow circuit that performs vacuum suction from the suction nozzle 20 and discharges positive pressure air from the suction nozzle 20 will be described with reference to FIG. As shown in FIG. 5, a switching valve 22 that is a three-way valve is connected to the nozzle mounting portion 8b to which the suction nozzle 20 is mounted in the unit mounting head 8a. A vacuum pump 23 serving as a vacuum suction means is connected to one port of the switching valve 22, and a mount blow valve 25 serving as an on / off valve is connected to the other port via a flow rate sensor 24. The switching valve 22 is a switching unit that selectively connects a vacuum suction unit and an air blowing unit, which will be described later, to the suction nozzle 20.

  The suction pump 20 is connected to the vacuum pump 23 by driving the vacuum pump 23 with the suction nozzle 20 mounted on the nozzle mounting portion 8b and switching the switching valve 22 to the vacuum pump 23 side. The vacuum suction is performed through the suction hole 20d provided in the nozzle shaft 20a. The circuit from the suction nozzle 20 to the vacuum pump 23 is a vacuum suction circuit through which air flows during vacuum suction.

  The mount blow valve 25 is connected to an air supply source 26, and the suction nozzle 20 is connected to the air supply source 26 via the mount blow valve 25 by switching the switching valve 22 to the mount blow valve 25 side. By opening the mount blow valve 25 in this state, positive pressure air supplied from the air supply source 26 is discharged from the suction hole 20 d of the suction nozzle 20. In this air blowing operation, after the electronic component sucked and held by the suction nozzle 20 is landed on the mounting point of the substrate 3, the electronic component is detached from the suction nozzle 20 (nozzle vacuum breakage), or the foreign matter in the suction hole 20d is removed. It is performed to blow away and clean up (nozzle cleaning blow). The air supply source 26 serves as an air blowing means for discharging positive pressure air from the suction nozzle 20, and the circuit from the air supply source 26 to the suction nozzle 20 is an air blow circuit through which positive pressure air flows during air blowing. The flow sensor 24 may be disposed between the nozzle mounting portion 8b and the switching valve 22. This is desirable because the flow rate on the suction side can also be measured by the single flow rate sensor 24.

  In the present embodiment, when it is necessary to detect the presence / absence of the suction nozzle 20 in the mounting head 8, a nozzle presence / absence detection method using the above-described configuration is used. That is, while the air blowing means is driven to discharge positive pressure air, the flow rate of the air flowing through the air blow circuit is measured by the flow rate sensor 24, and the presence or absence of the suction nozzle 20 in the mounting head 8 based on the flow rate measurement result by the flow rate sensor 24. Is determined.

In this nozzle presence / absence detection, the flow rate sensor 24 interposed in the air blow circuit detects the temperature difference of the fluid flowing through the air blow circuit, thereby determining the flow rate of the positive pressure air flowing through the air blow circuit per unit time by air blow. It is measured as a flow rate pattern (see FIG. 6) showing a significant change. The flow rate measurement result by the flow sensor 24 is sent to the determination unit 27, and the determination unit 27 compares the flow rate measurement result with the determination parameter 31 c stored in the storage unit 31, whereby each unit mounting head of the mounting head 8. It is determined whether or not the suction nozzle 20 is attached to 8a, and the presence or absence of the suction nozzle 20 is detected. That is, the determination unit 27 determines the presence or absence of the suction nozzle 20 in each unit mounting head 8 a of the mounting head 8 based on the flow measurement result of the flow sensor 24. When detecting the presence or absence of a nozzle, it is desirable to use an air blow at the time of nozzle cleaning blow rather than at the time of nozzle vacuum break because the pressure is higher, so that more stable detection can be performed.

  FIG. 6 shows an example of determining whether or not the suction nozzle 20 is present. FIG. 6A shows a state in which the air blowing operation is performed in a state where the suction nozzle 20 is mounted on the nozzle mounting portion 8b in the unit mounting head 8a. In this case, since positive pressure air by air blow is discharged from the suction hole 20d provided in the nozzle shaft 20a (arrow c), the discharge flow rate is limited by the hole diameter of the suction hole 20d, and a predetermined time t0 from the start of air blow. The flow rate measurement value obtained by the flow rate sensor 24 after the elapse of time has reached the steady discharge state converges to a predetermined first flow rate value Q1 corresponding to the hole diameter. In the nozzle presence / absence detection, “nozzle present” is obtained when the flow rate measurement value after the elapse of the predetermined time t0 is less than the threshold value Qth set with an appropriate margin for the first flow rate value Q1. Is made. The threshold value Qth is set to a value sufficiently smaller than the flow rate measurement value (second flow rate value Q2) in the “no nozzle” state shown below.

  6B shows a state where the suction nozzle 20 is once detached from the nozzle mounting portion 8b (arrow d) from the nozzle mounting state shown in FIG. 6A, and then is mounted again on the nozzle mounting portion 8b (arrow). f) shows the change in the flow rate measurement value of the flow rate sensor 24. The flow rate measurement value when the suction nozzle 20 is mounted is the first flow rate value Q1 shown in FIG. 6A. By removing the suction nozzle 20 from this state, the fitting hole 8c of the nozzle mounting portion 8b. Becomes an open state, and positive pressure air by air blow is directly discharged into the outside air through the fitting hole 8c (arrow e). Therefore, the flow rate measurement value by the flow rate sensor 24 rises rapidly from the timing t1 when the suction nozzle 20 is removed, and converges to the second flow rate value Q2 exceeding the threshold value Qth.

  When the suction nozzle 20 is remounted from this state, the flow rate measurement value by the flow rate sensor 24 sharply decreases from the timing t2 when the fitting portion 20c is fitted in the fitting hole 8c, and again becomes the first flow rate value Q1. Converge. The increase / decrease in the flow rate measurement value is caused by the presence / absence of the suction nozzle 20, and by monitoring the flow rate measurement value of the flow rate sensor 24 during the air blow operation, the presence / absence of the suction nozzle 20 in the unit mounting head 8a, It is possible to detect that the suction nozzle 20 is once mounted after being removed.

  Next, the configuration of the control system will be described with reference to FIG. The control unit 30 is a CPU, and controls each unit described below by executing a processing program stored in the storage unit 31. In this control process, data stored in the storage unit 31 is referred to. The storage unit 31 stores a processing program 31a, mounting data 31b, a determination parameter 31c, and identification information 31d. The processing program 31a is a program necessary for executing the operation and calculation of each unit described below. The mounting data 31b is data used in a mounting operation for mounting electronic components on the board 3, such as component data and mounting coordinate data.

The determination parameter 31 c is threshold data used to determine the presence or absence of the suction nozzle 20 in the mounting head 8 based on the flow measurement result by the flow sensor 24. The identification information 31d is identification information read by imaging the two-dimensional barcode label 21 attached to the suction nozzle 20 with the substrate recognition camera 9 which is an identification information reading unit. And nozzle mounting history data. Therefore, the storage unit 31 is an identification information storage unit that stores the identification information read by the identification information reading unit as mounting history data of the suction nozzle 20 in the mounting head 8.

  The operation / input unit 32 is based on a signal input by operating a button or a numeric keypad on the operation panel 15 provided on the operation unit 14 on the side of the apparatus, or an input signal from a touch panel switch set on the screen of the display panel 16. Performs processing for operation commands and data input. The display unit 33 performs processing for displaying various screens such as a guidance screen at the time of operation by the operation panel 15 on the display panel 16 provided adjacent to the operation panel 15.

  The mechanism control unit 34 controls operations of the head driving mechanism 35 and the switching valve 22 that move the substrate transport mechanism 2 and the mounting head 8 together with the substrate recognition camera 9. Thereby, the board | substrate recognition camera 9 can be moved to the nozzle stocker 11, and the arbitrary suction nozzle 20 can be imaged and the two-dimensional barcode label 21 can be read. The recognition processing unit 36 performs recognition processing of the imaging result by the board recognition camera 9 and the component recognition camera 10. As a result, the position of the substrate 3 and the position of the electronic component held by the mounting head 8 are recognized, and the two-dimensional barcode label 21 applied to the suction nozzle 20 is read.

  The determination unit 27 compares the flow measurement result obtained by the flow sensor 24 with the determination parameter 31 c stored in the storage unit 31 and executes a predetermined determination process, thereby detecting the presence or absence of the suction nozzle 20 in the mounting head 8. I do. Accordingly, the flow sensor 24 and the determination unit 27 are nozzle presence / absence detection units that detect the presence / absence of the suction nozzle 20 in the mounting head 8.

  In addition to the configuration shown in the present embodiment, various configurations can be adopted as the nozzle presence / absence detection unit. For example, instead of measuring the flow rate of the air blow circuit with the flow rate sensor 24, a flow rate sensor similar to the flow rate sensor 24 is provided in the vacuum suction circuit for vacuum suction from the vacuum pump 23, and the suction nozzle 20 is based on the flow rate measurement result. The presence or absence of may be detected. In this case, the fact that the vacuum suction flow rate varies depending on the presence or absence of the suction nozzle 20 is used. Further, the degree of vacuum in the vacuum suction circuit when the vacuum pump 23 is operated to perform vacuum suction from the suction nozzle 20 may be measured, and the presence or absence of the suction nozzle 20 may be detected based on the measurement result. In this case, the fact that the degree of ultimate vacuum differs depending on the presence or absence of the suction nozzle 20 is utilized. Further, the presence of the suction nozzle 20 may be directly detected by an optical sensor.

  However, when the measurement result of the vacuum suction flow rate or the ultimate vacuum is used as a configuration for detecting the presence or absence of the nozzle, the following inconvenience may occur. That is, in these methods, since it is assumed that vacuum suction is performed from the vacuum suction circuit, it is inevitable that fine foreign matter is sucked into the vacuum suction circuit via the suction nozzle, and the sucked foreign matter is There is a risk of premature clogging of the filter deposited and attached to the vacuum suction circuit. Further, when it is necessary to replace the suction nozzle within such a monitoring time, since a suction force acts on the nozzle, a large force is required to disengage the suction nozzle from the mounting head. On the other hand, as shown in the present embodiment, by adopting a method of detecting the presence or absence of nozzles based on the flow measurement result at the time of air blowing, the detection function is activated continuously for a long time in the apparatus operating state, Even when the presence / absence is constantly monitored, inconveniences inevitably caused by the vacuum suction operation as described above can be eliminated.

The open / close detection unit 37 detects whether or not the cover door 13 is opened in the electronic component mounting apparatus based on the output signal of the door open / close detection sensor 13a. Based on the detection result of the cover door opening / closing by the opening / closing detection unit 37 and the determination result of the determination unit 27, the remount detection unit 38 performs a process of detecting that the suction nozzle has been removed and then remounted by the machine operator. . Here, when the opening / closing detection unit 37 detects that the cover door 13 has been opened, the remounting detection unit 38 switches the switching valve 22 to the air blow side to open the mount blow valve 25, and the air supply source 26 is operated to discharge positive pressure air from the suction nozzle 20. In this state, the determination unit 27 monitors the flow rate measurement value of the flow rate sensor 24, whereby the reattachment detection process of the suction nozzle 20 shown in FIG. 6B is executed.

  In other words, the remounting detection unit 38 continuously executes the nozzle presence / absence detection process using the opening / closing detection signal of the cover door 13 as a trigger, and “nozzle present” − “no nozzle” − “nozzle present” during the cover door opening time. If it is detected successively in order, it is assumed that the suction nozzle 20 has been once removed by the machine operator and then reattached, and this is notified. In other words, the remount detection unit 38 estimates that the suction nozzle has been remounted after being removed once by combining the detection result of the opening / closing of the cover door by the open / close detection means and the detection result of the presence / absence of the nozzle. Detect. Based on the detection result of the reattachment detection unit 38, the identification control unit 39 executes a process for causing the identification information reading unit to perform a reading operation of the identification information. The identification information update unit 40 executes processing for writing the newly read identification information in the identification information storage unit and updating the mounting history data.

  During operation of the electronic component mounting apparatus, operational abnormalities due to various factors occur, and these operational abnormalities are detected by sensors provided in each part of the apparatus or a monitoring program previously incorporated in the operational program, The machine operator is notified accordingly. In such a case, the machine operator accesses the apparatus and performs inspections and measures for eliminating the notified abnormality.

  At this time, when it seems that the abnormality occurrence state is related to the suction nozzle 20, the machine operator opens the cover door 13 and inspects the inside, and in some cases, the suction nozzle 20 is removed by manual operation. Observe the nozzle suction surface for wear and clogging. If it is determined that the nozzle is defective, the suction nozzle 20 is replaced with a new suction nozzle 20 of the same type. In such a case, the storage unit 31 still stores the suction nozzle 20 determined to be defective as nozzle history data, and the fact that the nozzle replacement has been performed is not reflected in the nozzle history data. Result.

  In order to prevent such a situation, in this embodiment, an automatic update process of the suction nozzle mounting history as shown in FIG. 8 is performed. This process shows a nozzle mounting history data management method for managing mounting history data of the suction nozzle 20 in the mounting head 8.

  In FIG. 8, when an operation abnormality is notified during operation of the electronic component mounting apparatus (ST1), the machine operator accesses the apparatus (ST2). The machine operator opens the cover door 13 according to the abnormality content notified at this time, and executes an inspection operation inside the apparatus (ST3). In this inspection work, when the abnormality is related to the suction nozzle 20, the machine operator removes the suction nozzle 20 attached to the unit mounting head 8a informed of the abnormality by manual operation and checks the state. To do. If the check result shows that the foreign substance can be repaired by repairs such as clogging due to foreign matter, the suction nozzle 20 is remounted as it is after performing the necessary repairing procedure. On the other hand, when it is determined that the repair is not possible, such as nozzle end wear, the machine operator performs a nozzle replacement operation for mounting a new suction nozzle 20 of the same type.

In the process of performing this inspection work, the remount detection unit 38 monitors whether or not the suction nozzle 20 is remounted. That is, when the open / close detection unit 37 detects the opening of the cover door 13, the determination unit 27 starts monitoring the attachment / detachment of the suction nozzle 20 (ST4). This attachment / detachment monitoring is performed when the determination unit 27 serving as the nozzle presence / absence detection unit detects the presence / absence of the suction nozzle 20 based on the flow rate measurement result by the flow rate sensor 24.

  In this attachment / detachment monitoring, if the remounting detection unit 38 detects remounting of the suction nozzle 20, that is, by combining the cover door 13 opening / closing detection result and the nozzle presence / absence detection result, the suction nozzle 20 is once removed. If it is detected later that the machine operator has re-installed based on the detection result by the nozzle presence / absence detection unit, the display unit 33 displays a notification screen on the display panel 16 to notify the detection of re-mounting (ST5). ).

  That is, as shown in FIG. 9, the suction nozzle 20 once removed is remounted on the display screen 16a of the display panel 16, and a warning that there is a possibility of an ID (identification information) reading error is given. A message prompting whether or not to automatically read the ID (“YES” or “NO”) is displayed (ST6), and the machine operator needs to read the identification information of the suction nozzle 20 depending on the situation. Is determined (ST7).

  When remounting is not detected in (ST5) and when the machine operator determines that the reading operation is unnecessary in (ST7) and selects “NO” on the display screen 16a, the normal operation is restored (ST10). The case where “NO” is selected is a case where the suction nozzle is remounted in the inspection work, but the already mounted one is just remounted and the nozzle is not replaced. In this case, it is determined that the ID reading operation is unnecessary because the machine operator who performed the work knows this.

  On the other hand, when the nozzle is replaced in the inspection work, in (ST7), the machine operator determines that the reading operation for the new suction nozzle 20 is necessary, and “YES” is displayed on the display screen 16a. select. This instruction input is transmitted to the identification control unit 39, and the identification information reading operation of the suction nozzle 20 shown in FIG. 4 is executed (ST8).

  That is, the mounting head 8 is moved onto the nozzle stocker 11, and the suction nozzle 20 mounted on the unit mounting head 8 a detected to be remounted is temporarily mounted on the mounting table 11 a of the nozzle stocker 11. Next, the suction nozzle 20 is imaged by the substrate recognition camera 9 provided integrally with the mounting head 8 to read the two-dimensional barcode label 21. Thereafter, the suction nozzle 20 is mounted again on the unit mounting head 8a. Thereafter, the identification information 31d is updated by writing the read identification information into the storage unit 31 by the identification information updating unit 40 (ST9).

  In the above processing, if the reattachment of the suction nozzle 20 is detected, the substrate recognition camera 9 which is the identification information reading unit performs the reading operation of the two-dimensional barcode label 21, and the newly read identification information 31d. Is updated in the storage unit 31 as the identification information storage unit. In the above processing, the display panel 16 and the display unit 33 function as a display unit that displays a detection result by the remounting detection unit 38. The operation panel 15 and the operation / input unit 32 function as input means for instructing the identification control unit 39 whether or not the identification information reading operation determined by the machine operator in response to the displayed detection result is necessary. Yes.

In this embodiment, the machine operator who has received the displayed detection result determines whether or not the identification information reading operation is necessary, and causes the identification information reading unit to perform the identification information reading operation. . By executing such an automatic update process of the suction nozzle mounting history, it is possible to correctly manage the nozzle mounting history data and ensure data reliability. Even when the suction nozzle mounting history is not automatically updated, if the suction nozzle is remounted by manual operation by the machine operator, identification is performed as necessary based on the detection result by the remount detection unit 38. An information reading operation can be performed. Similarly, the nozzle mounting history data can be correctly updated and managed to ensure data reliability.

  If it is desired to eliminate errors in the nozzle mounting history data due to the human error of the machine operator, the processes (ST6) and (ST7) in FIG. 8 may be omitted. In this case, if the reattachment of the suction nozzle 20 is detected in (ST5), the process proceeds to (ST8) unconditionally and the identification information reading operation is executed without depending on the determination by the machine operator. As a result, when the suction nozzle 20 is remounted, the two-dimensional barcode label 21 of the suction nozzle 20 is always read, and the correct nozzle mounting history is always recorded without human error, and the traceability is highly reliable. It becomes possible to secure by sex.

  In the above embodiment, an example in which a door opening / closing detection signal indicating that the cover door 13 is opened is used as a trigger signal for starting the remount detection by the remount detection unit 38 is shown. A signal other than the door open / close detection signal may be used as long as it indicates that some operation has been performed. For example, in a case where a sensor for ensuring safety for detecting that a part of the body such as an upper limb of a machine operator has entered a gap space near the tape feeder 5 in the component supply unit 4 is provided. Remount detection by the remount detection unit 38 may be started using the detection signal of this sensor as a trigger. Further, when the component mounting function of the electronic component mounting apparatus is stopped, the air blowing operation is always continued, the flow sensor 24 and the determination unit 27 are caused to function, and the remount detection by the remount detection unit 38 is always executed. You may do it.

  The electronic component mounting apparatus and the nozzle presence / absence detection method of the present invention have the effect of being able to eliminate the inconvenience that occurs when detecting the presence / absence of a nozzle based on the measurement result of the degree of vacuum during vacuum suction. It can be used in the field of electronic component mounting that is mounted on a substrate by suction holding.

The top view of the electronic component mounting apparatus of one embodiment of this invention The figure which shows the cover arrangement | positioning of the electronic component mounting apparatus of one embodiment of this invention The figure which shows the structure of the mounting head of the electronic component mounting apparatus of one embodiment of this invention Explanatory drawing of the reading operation | movement of the identification information of the suction nozzle in the electronic component mounting apparatus of one embodiment of this invention The block diagram which shows the structure of the vacuum suction and air blow circuit of the electronic component mounting apparatus of one embodiment of this invention Explanatory drawing of mounting | wearing presence / absence detection of the suction nozzle in the electronic component mounting apparatus of one embodiment of this invention The block diagram which shows the structure of the control system of the electronic component mounting apparatus of one embodiment of this invention The flowchart which shows the automatic update process of the suction nozzle mounting history in the electronic component mounting apparatus of one embodiment of this invention The figure which shows the display screen in the electronic component mounting apparatus of one embodiment of this invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 3 Board | substrate 4 Component supply part 8 Mounting head 8a Unit mounting head 8b Nozzle mounting part 9 Board | substrate recognition camera 11 Nozzle stocker 13 Cover door 15 Operation panel 16 Display panel 20 Adsorption nozzle 21 Two-dimensional barcode label

Claims (2)

An electronic component mounting apparatus that picks up an electronic component from a component supply unit by vacuum suction using a suction nozzle that is detachably mounted on a mounting head, and mounts the electronic component on a substrate.
An air blow unit that discharges positive pressure air from the suction nozzle, a flow rate sensor that is interposed in an air blow circuit that extends from the air blow unit to the suction nozzle, and that measures the flow rate of positive pressure air flowing through the air blow circuit, and the flow rate sensor An electronic component mounting apparatus comprising: a determination unit that determines presence or absence of the suction nozzle in the mounting head based on a flow measurement result. In an electronic component mounting apparatus that picks up an electronic component from a component supply unit by vacuum suction using a suction nozzle that is detachably mounted on the mounting head, and mounts the electronic component on a substrate, the presence / absence detection of the nozzle in the mounting head is detected. A method,
The electronic component mounting apparatus includes an air blow unit that discharges positive pressure air from the suction nozzle and an air blow circuit that is interposed in an air blow circuit from the air blow unit to the suction nozzle and measures the flow rate of the positive pressure air that flows through the air blow circuit. With a sensor,
The flow rate sensor measures the flow rate of air flowing through the air blow circuit while driving the air blow means to discharge positive pressure air, and determines the presence or absence of the suction nozzle in the mounting head based on the flow rate measurement result by the flow rate sensor. A nozzle presence / absence detection method characterized by:

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