TWI706811B - Control method to prevent glue leakage of dispenser - Google Patents

Abstract

A control method for preventing glue leakage of a dispenser is executed by a controller of the dispenser, the controller is electrically connected to a motor and the motor drives a dispensing screw, the controller intermittently outputs a first driving signal To drive the motor to drive the glue screw to rotate the glue, the control method includes: (a) accumulating the time that the motor stops running as an interval time; (b) judging whether the interval time reaches a threshold time; (c) when When the interval time reaches the threshold time, a second drive signal is output to the motor to drive the motor to drive the glue screw to rotate and return to glue, and step (a) is restored; the first drive signal drives the rotation of the motor and the The second driving signal drives the motor to reverse the direction of rotation, and the interval time is reset to zero after outputting the first driving signal or the second driving signal.

Description

Control method to prevent glue leakage of dispenser

The invention relates to a control method, in particular to a control method for preventing glue leakage from a dispenser.

Electronic devices are mainly assembled from integrated circuit chips or various electronic parts. For example, on a production line, a dispenser dispenses liquid gel onto the surface of the circuit board, and then places the integrated circuit chip on the circuit board for distribution. Where there is a liquid gel, the integrated circuit chip and the circuit board are bonded and fixed to each other by the liquid gel.

The conventional glue dispensing machine mainly includes a motor, a glue screw, a glue needle and a glue barrel. The motor, the glue screw and the glue needle can be arranged in an upright manner, and the motor shaft can pass through the coupling The upper end of the glue outlet screw is connected, the glue outlet needle is located below the glue outlet screw, and the glue cylinder is filled with liquid gel. During the dispensing operation, move a circuit board to the dispensing work area (that is, below the dispensing needle), the liquid gel in the glue barrel can be pushed to the screw thread interval of the dispensing screw under pressure In the space, when the motor is driven to rotate, it can drive the glue out screw to rotate. During the rotation, the direction of the screw thread of the glue out screw is directional. It faces the glue out needle, and then divides the screw in the space. The liquid colloid is pushed to the glue needle. Thereby, the liquid glue can be squeezed out of the glue needle to be distributed to the surface of the circuit board.

The production process of the production line is that when the dispensing operation of a circuit board is completed, the circuit board that has completed the dispensing operation is removed from the dispensing work area, and then another circuit board is moved to the dispensing work area for dispensing operation. However, during the movement of the empty windows of different circuit boards, the motor is suspended, so the glue ejection needle does not eject glue. At this time, the liquid colloid remaining in the glue ejection needle may drip down, causing pollution to the production line equipment or product.

The main purpose of the present invention is to provide a control method to prevent glue leakage of the glue dispenser. The technical problem to be solved is: when the motor of the glue dispenser is suspended, the liquid colloid staying in the glue needle may drip down The problem.

The control method for preventing glue leakage of the glue dispenser of the present invention is executed by a controller of the glue dispenser, the controller is electrically connected to a motor and the motor drives a glue screw, and the controller intermittently outputs a first drive The signal is used to drive the motor to drive the glue discharging screw to rotate the glue, and the control method includes: (a) The accumulated time for the motor to stop running is an interval time; (b) Determine whether the interval time reaches a threshold time; (c) When the interval time reaches the threshold time, output a second drive signal to the motor to drive the motor to drive the glue screw to rotate back to glue, and return to step (a); Wherein, the rotation direction of the motor driven by the first driving signal is opposite to the rotation direction of the motor driven by the second driving signal, and the interval time is reset to zero after outputting the first driving signal or the second driving signal.

According to the control method of the present invention, as long as the motor stops running and the time the motor stops running reaches the threshold time, the controller outputs the second drive signal to drive the motor to rotate, because the first drive signal drives the motor The direction of rotation is opposite to the direction of the second drive signal to drive the motor, so the motor rotating according to the second drive signal can drive the glue screw to reverse to withdraw the liquid glue, which can effectively prevent the liquid glue from leaking .

To illustrate the embodiment of the present invention, the dispenser shown in FIGS. 1 and 2 is taken as an example, but it is not limited to this structure. As shown in Figures 1 and 2, the dispenser structure mainly includes a motor 10, a base 11, a glue needle 12, a glue cylinder 13, and a glue supply seat 14. The base 11 is provided with a coupling 15. A rubber screw 16 and a rubber ring 17.

The motor 10, the base 11, and the glue ejection needle 12 can be arranged in an upright manner. The motor 10 is arranged on the top of the base 11, and the shaft 100 of the motor 10 extends into the base 11, and the glue screw 16 Standing upright in the base 11, the coupling 15 connects the rotating shaft 100 of the motor 10 with the upper end of the glue outlet screw 16, so that when the motor 10 is running, the glue outlet screw 16 can be driven to rotate, and the rubber outlet ring 17 is fixed. There is a vertical passage 170 in the seat body 11, the lower end of the glue outlet screw 16 has threads and is located in the vertical passage 170, the glue outlet screw 16 can rotate relative to the rubber outlet ring 17, the seat body 11 There is a glue channel 110, one side of the glue channel 110 is connected to the screw thread space of the glue screw 16, the other side of the glue channel 110 extends to the outer surface of the base body 11 to form an opening, the glue needle 12 Set at the bottom of the seat 11 and below the glue outlet screw 16, the glue outlet needle 12 has a flow channel 120 which communicates with the vertical channel 170 of the glue outlet ring 17. The inner space of the glue cylinder 13 is equipped with a liquid glue 20 for adhesive purposes. The top of the glue cylinder 13 is provided with an air pressure device 18, and the glue supply seat 14 is arranged at the bottom of the glue cylinder 13 and is connected to the glue cylinder 13 and Between the seats 11, the glue supply seat 14 has a glue supply channel 140, and the glue supply channel 140 communicates with the inner space of the glue cylinder 13 and the glue channel 110 of the seat 11.

Please refer to FIG. 3, the control method for preventing glue leakage of the dispenser of the present invention is executed by a controller 30 of the dispenser. The controller 30 is electrically connected to the motor 10 to output a driving signal to the motor 10. Rotate according to the driving signal.

During the dispensing operation, the target (such as the circuit board) is moved to the dispensing work area (ie below the dispensing needle 12), and the air pressure device 18 can provide downward air pressure to the liquid gel 20 in the glue cylinder 13 , The liquid gel 20 is pressed and sequentially passes through the glue supply channel 140 of the glue supply seat 14 and the glue channel 110 of the base body 11 to enter the screw thread space of the glue outlet screw 16, so that the liquid gel 20 is distributed in At the same time, the controller 30 outputs a driving signal to the motor 10 to drive the motor 10 to drive the glue screw 16 to rotate, and the direction of the thread movement of the glue screw 16 in rotation It has directionality, which is downward (that is, toward the glue ejection needle 12), so the liquid colloid 20 in the screw thread space is pushed toward the glue ejection needle 12, so that the liquid colloid 20 is squeezed out of the flow channel 120 And attached to the surface of the target.

The glue dispensing process of the glue dispenser is described above. In the present invention, the drive signal used to drive the motor 10 to perform glue dispensing is the first drive signal S1. On the other hand, the controller 30 can output a second drive. The signal S2 is given to the motor 10, and the motor 10 also runs according to the second driving signal S2, wherein the first driving signal S1 drives the motor 10 in a direction opposite to that of the second driving signal S2 driving the motor 10 For the convenience of description, the first drive signal S1 drives the rotation of the motor 10 to forward rotation, so it drives the glue screw 16 to rotate forward; on the contrary, the second drive signal S2 drives the rotation of the motor 10 to reverse. Therefore, the glue screw 16 is driven to reverse. Thereby, the moving direction of the screw thread of the glue discharging screw 16 in the reverse direction is upward, and the liquid colloid 20 staying in the flow channel 120 of the glue discharging needle 12 can be withdrawn, so as to prevent the liquid colloid 20 from leaking out. The means of driving the motor to rotate (forward and reverse) are well known to those skilled in the art and will not be described in detail here.

The following uses a timing diagram to assist in explaining the implementation of the control method of the present invention. In this article, each time point in the timing diagram is represented by "t _x ", and the subscript "x" is only used to indicate different time points, not a time sequence.

Please refer to FIG. 4A. After the dispenser is turned on at t ₀ , the controller 30 starts its work schedule. In the working schedule of the dispenser, the timing of the first drive signal S1 shown in FIG. 4B indicates that some liquid colloid 20 is extruded during the enabling time from t ₁ to t ₂ and then passes through the dispenser. The vacuum suction device removes it, which is used to clean the glue ejection needle 12. The timing sequence of the first driving signal S1 shown in FIG. 4C indicates that the liquid colloid 20 is extruded during the enabling time from t ₃ to t ₄ , and the extruded liquid colloid 20 is used to attach to a target (such as a circuit board). )on. It can be seen that the purpose of glue dispensing may include the cleaning purpose shown in FIG. 4B and the dispensing purpose shown in FIG. 4C, and the cleaning purpose is the pre-operation of the dispensing purpose. At time t ₄ to _{t. 5,} the controller 30 does not output the first driving signals S1, so that the motor 10 is stopped without glue, showing the glue dispenser may be moving target location. After the glue dispensing position is positioned at time t ₅ , the first drive signal S1 is output to the motor 10 during the enabling time from t ₅ to t ₆ to perform glue dispensing, and then at time t ₆ to t ₇ The first drive signal S1 is not output in, the subsequent sequential actions can be deduced by analogy. When the dispensing operation of a target is completed at time t8, please refer to the target conversion sequence shown in Figure 4D. The dispensing machine will complete the dispensing operation from the target from the dispensing work from t ₉ to t ₁₀ The area is moved away and another target is moved to the dispensing work area. Therefore, the first driving signal S1 is not output from t ₉ to t ₁₀ , please refer to FIG. 4B, and then the first driving signal S1 is set at the time point t ₁₁ executes the aforementioned cleaning operation. Therefore, the mode and purpose of outputting the first driving signal S1 by the controller 30 shown in FIGS. 4B and 4C can be deduced by analogy.

As shown in FIG. 4B and FIG. 4C, the controller 30 does not continuously output the first driving signal S1. For example, the first driving signal S1 is not output during the time from t ₀ to t ₁ , and the first driving signal S1 is not output from t ₁ to t. The first driving signal S1 is output at the time of ₂ , and the first driving signal S1 is not output at the time of t ₂ to t ₃ , and the first driving signal S1 is output at the time of t ₃ to t ₄ , and at t ₄ to time t _5, the first driving signal S1 is not output, and so on, we can see that the controller 30 is taken to output the first embodiment intermittent driving signal S1.

Please refer to FIG. 5, the control method for preventing glue leakage of the dispenser of the present invention is executed by the controller 30 of the dispenser and includes the following steps:

Step S01: The accumulated time for the motor 10 to stop running is an interval time. In this step, when the controller 30 does not output the first driving signal S1 and the second driving signal S2, the motor 10 stops running, so the controller 30 can accumulate the time the motor 10 stops running as the interval time . On the other hand, the controller 30 does not output the first driving signal S1 and the second driving signal S2 at the same time, and only outputs one of the driving signals at the same time and stops outputting the other driving signal, that is, only the first driving signal is output at the same time. A driving signal S1 or the second driving signal S2, wherein the first driving signal S1 is output with priority over the second driving signal S2. For example, even if the second driving signal S2 is still in progress and not finished, it just hits When the first driving signal S1 is to be output, the controller 30 can directly stop outputting the second driving signal S2, and connect the first driving signal S1 to the unfinished second driving signal S2.

Step S02: Determine whether the interval time reaches a threshold time. In this step, for example, the controller 30 does not output the first driving signal S1 after the time point t ₀ , and the motor 10 stops running, so the interval time starts from the time point t _0. When the interval time does not reach the threshold Time, continue to accumulate the interval time.

Step S03: When the interval time reaches the threshold time, the controller 30 outputs the second driving signal S2 to the motor 10 to drive the motor 10 to drive the glue screw 16 to rotate back to glue, and return to step S01. Wherein, the enabling time length of the second driving signal S2 and the threshold time are adjustable parameters preset in the controller 30, the enabling time length of the second driving signal S2 and the threshold time length They can be the same or different from each other. For example, the length of the enabling time of the second driving signal S2 and the length of the threshold time can be 0.03 seconds, but not limited thereto.

In step S03, because the interval time reaches the threshold time, it means that the motor 10 has been stopped for a long time. In order to prevent the liquid gel 20 staying in the glue ejection needle 12 from leaking downward, the second drive signal S2 is output. The motor 10 is controlled to reverse, and the liquid glue 20 staying in the glue needle 12 is withdrawn upward through the reversing glue screw 16.

From the timing chart, as shown in FIG. 4A, the controller 30 starts to accumulate the interval time from time t ₀ , and as time progresses, it is determined that the interval time reaches the threshold time at time t ₁₂ in FIG. 4F. The second driving signal S2 is output from t ₁₂ to t ₁₃ . Since the actuator motor 10 according to the second driving signal S2 state operation is not stopped, so the controller 30 at time t ₁₃ after the completion of outputting the second driving signal S2, the zeroing interval, and return to Step S01 .

Similarly, the controller 30 starts from the time point t _{13 is} the total time interval, as time goes on, it is determined that the interval of time in FIG. 4F reaches the threshold time t _14, and at the time t ₁₄ to t ₁₅ of the second output signal S2 to the driving motor 10 so that the motor 10 is stopped and not inverted state, so that the controller 30 is completed at time t ₁₅ the output of the second driving signal S2, the time interval zero , And reply to step S01.

Please refer to FIG. 4B, 4C, and 4F, the controller 30 from the time point t ₁₅ starts accumulating the time interval, as time goes on, the controller 30 outputs the first driving signal S1 at the time point t _1, so the The motor 10 is in the non-stop running state after the time point t _1. At this time, the current accumulated interval time is t ₁₅ to t ₁ , which has not reached the threshold time, so the controller 30 is in the interval time t ₁₅ to t ₁ The second driving signal S2 is not outputted inside. When the controller 30 at a time point t ₂ to complete the first output driving signals S1, the zero time interval, and return to step S01 from a time point t ₂ starts accumulating the time interval; Similarly, t ₂ to t The interval time of ₃ exceeds the threshold time, so the second drive signal S2 is output; the interval time from t ₄ to t _{5 does} not reach the threshold time, so the second drive signal S2 is not output. The subsequent control sequence can be deduced by analogy.

Please refer to Figure 4E and in conjunction with Figure 4B, Figure 4C and Figure 4F. When the dispenser is turned on, after a fault event occurs at time t ₁₆ , even if the first drive signal S1 was originally to be output at that time, it still has a fault. event stops outputting the first driving signals S1, steps S01 to S03 is performed so as to output a second driving signal S2, until the time point _{t. 17} troubleshooting, 4B, at time point t ₁₈ outputs a first driving signal S1 is used to clean the glue ejection needle 12, and then output the first driving signal S1 at time t ₁₉ to eject glue on the target. The subsequent control timing can be analogous to the foregoing embodiment.

In summary, when the motor 10 stops running due to various reasons, as long as the controller 30 determines that the time when the motor 10 stops running reaches the threshold time, it outputs the second drive signal S2 to drive the motor 10 to reverse rotation. , And then drive the glue out screw 16 to reverse. The glue out screw 16 in the reverse direction draws the liquid gel 20 staying in the glue needle 12 upwards, which can effectively avoid the liquid staying in the glue needle 12 The shaped colloid 20 leaks downward.

10: Motor

100: shaft

11: Seat

110: Glue channel

12: Glue out needle

120: runner

13: plastic tube

14: Plastic seat

140: for glue channel

15: Coupling

16: Glue screw

17: Out of the rubber ring

170: Upright Channel

18: Air pressure device

20: Liquid colloid

30: Controller

S1: the first drive signal

S2: second drive signal

Fig. 1: A schematic diagram of a three-dimensional appearance of an exemplary dispenser for an embodiment of the present invention. Fig. 2: A schematic cross-sectional view of an exemplary dispensing machine applied in an embodiment of the present invention. Fig. 3: A schematic block diagram of a circuit of a dispenser applied in an embodiment of the present invention. Figure 4A: Schematic diagram of the startup sequence of the dispenser. Fig. 4B: A timing diagram of the first driving signal S1 (1). Fig. 4C: A timing diagram of the first driving signal S1 (2). Figure 4D: Schematic diagram of target conversion sequence. Figure 4E: Schematic diagram of fault event sequence. Fig. 4F: A timing diagram of the second driving signal S2. Fig. 5: A schematic flowchart of an embodiment of the present invention.

Claims (7)

A control method for preventing glue leakage of a dispenser is executed by a controller of the dispenser. The controller is electrically connected to a motor and the motor drives a dispensing screw. The controller intermittently outputs a first drive The signal is used to drive the motor to drive the glue screw to rotate the glue. The control method includes: (a) accumulating the time that the motor stops running as an interval time; (b) judging whether the interval time reaches a threshold time; (c) When the interval time reaches the threshold time, a second drive signal is output to the motor to drive the motor to drive the glue screw to rotate back to glue, and step (a) is restored; wherein, the first drive signal drives the motor to drive The rotation direction of the glue discharging screw is opposite to that of the second driving signal driving the motor to drive the glue discharging screw, and the interval time is reset to zero after outputting the first driving signal or the second driving signal. The control method for preventing glue leakage of a dispenser as described in claim 1, wherein after a fault event occurs in the dispenser, the controller stops outputting the first driving signal until the fault is eliminated. The control method for preventing glue leakage of a dispenser as described in claim 1 or 2, wherein the enabling time length of the second driving signal and the threshold time length are preset in adjustable parameters of the controller and mutually exclusive the same. The control method for preventing glue leakage of a dispenser as described in claim 1 or 2, wherein the enabling time length of the second driving signal and the threshold time length are preset in adjustable parameters of the controller and mutually exclusive different. The control method for preventing glue leakage of a dispenser according to claim 1 or 2, wherein the controller outputs the first drive signal or the second drive signal at the same time, and the first drive signal is greater than the second drive signal Priority output. The control method for preventing glue leakage of a dispenser as described in claim 3, wherein the controller outputs the first drive signal or the second drive signal at the same time, and the first drive signal is output prior to the second drive signal . The control method for preventing glue leakage of a dispenser as described in claim 4, wherein the controller outputs the first drive signal or the second drive signal at the same time, and the first drive signal is output prior to the second drive signal .

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