PCB cleaning device

Abstract

The utility model discloses a PCB (printed circuit board) cleaning device which comprises a board pushing mechanism and a cleaning mechanism, the cleaning mechanism comprises a fan, and an air outlet of the fan faces a PCB to be cleaned; the push plate mechanism is used for placing and pushing a to-be-cleaned PCB to move towards an air outlet of the fan, the push plate mechanism is provided with a control unit, and the control unit controls the push plate mechanism to move through a push plate signal; an electromagnetic valve is arranged at an air source of the fan, the electromagnetic valve is used for controlling the opening and closing of the air source, the electromagnetic valve is connected to the control unit, and the control unit can control the opening and closing of the electromagnetic valve through a driving signal; the push plate signal and the driving signal are triggered at the same time. Compared with the prior art, the PCB cleaning device can clean PCBs while pushing the PCBs, manual board brushing is not needed, the labor cost is reduced, and the productivity is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a plate feeding machine, especially a PCB cleaning device. BACKGROUND

[0002] At present, after the PCB is inserted by the AI automatic inserting machine, the pin residues and mechanical ash during AI pin cutting will be left on the PCB, which will affect the subsequent SMT red glue process. The conventional method is to manually brush the PCB after AI automatic insertion. However, the quality of manual work cannot be guaranteed, the production capacity is low, and the uneven control of manual work intensity will damage the connection of the PCB and cause the PCB to break, which will affect the subsequent SMT and the over-peak welding in the later stage.

[0003] Therefore, how to design a PCB cleaning device that can brush the PCB synchronously during the pushing process to reduce manual brushing and realize automatic cleaning is an urgent technical problem in the industry. UTILITY MODEL CONTENT

[0004] In view of the problem that manual brushing is required after the PCB is inserted by the automatic inserting machine in the prior art, which cannot guarantee the quality of the PCB, the utility model provides a PCB cleaning device.

[0005] The technical scheme of the utility model provides a PCB cleaning device, which comprises a plate pushing mechanism and a cleaning mechanism, the cleaning mechanism comprises a fan, and the air outlet of the fan is arranged to face the PCB to be cleaned.

[0006] The plate pushing mechanism is used to place and push the PCB to be cleaned to move towards the air outlet of the fan, and the plate pushing mechanism has a control unit, which controls the movement of the plate pushing mechanism through a plate pushing signal.

[0007] An electromagnetic valve is arranged at the air source of the fan, which is used to control the opening and closing of the air source, and the electromagnetic valve is connected to the control unit, which can control the opening and closing of the electromagnetic valve through a driving signal.

[0008] The plate pushing signal and the driving signal are triggered at the same time.

[0009] Further, a plurality of air knives for air supply are arranged at the air outlet of the fan, the air source supplies air to the air knives through an air pipe, and the electromagnetic valve is arranged in the air pipe to control the opening and closing of the air source by controlling the opening and closing of the air pipe.

[0010] Further, the control unit at least has:

[0011] A plate pushing signal triggering module is used to send the plate pushing signal.

[0012] a driving signal triggering module for sending the driving signal;

[0013] a sampling feedback module connected to the push plate signal triggering module and the driving signal triggering module respectively for detecting whether the push plate signal is triggered and providing a feedback signal for the driving signal triggering module when the push plate signal is triggered.

[0014] Further, the sampling feedback module comprises a sampling circuit and a feedback circuit connected to the sampling circuit.

[0015] The sampling circuit is connected to the push plate signal triggering module for detecting whether the push plate signal is triggered, and the feedback circuit is connected to the driving signal triggering module for providing a feedback signal for the driving signal triggering module.

[0016] Further, the sampling circuit adopts a sampling resistor.

[0017] Further, the feedback circuit comprises a comparator and a triode connected to the comparator.

[0018] The inverting input end of the comparator is connected to a reference signal, the non-inverting input end of the comparator is connected to the sampling resistor, the output end of the comparator is connected to the base of the triode, the collector of the triode is connected to a power supply, and the emitter of the triode is connected to the driving signal triggering module.

[0019] Further, the sampling feedback module further comprises a reference circuit for providing a reference signal for the feedback circuit.

[0020] The reference circuit has at least two voltage dividing resistors connected in series between the power supply and the ground, and the feedback circuit is connected between any two adjacent resistors.

[0021] Further, the push plate mechanism drives the PCB to be cleaned to move to a position 13 cm below the air outlet of the fan.

[0022] Further, the control unit can adopt a single-chip microcomputer.

[0023] Compared with the prior art, the present application has at least the following beneficial effects:

[0024] The present application designs a push plate mechanism and a cleaning mechanism, and the two mechanisms are controlled by push plate signals and driving signals respectively. The present application enables the push plate signal and the driving signal to be triggered simultaneously by the setting of the control unit, so that the PCB to be cleaned can be cleaned synchronously during the process of being pushed onto the plate, without the need for subsequent manual plate cleaning work, thereby reducing the labor cost and improving the production capacity. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative labor on the basis of these drawings.

[0026] Figure 1 It is a structural schematic diagram of the present application.

[0027] Figure 2 It is a control block diagram of the present application. DETAILED DESCRIPTION

[0028] In order to make the technical problems, technical solutions and beneficial effects of the present application more clearly understood, the present application will be further described in detail in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application.

[0029] Therefore, one feature described in the specification will be used to explain one feature of one embodiment of the present application, but it does not mean that each embodiment of the present application must have the described feature. In addition, it should be noted that the present specification describes many features. Although some features can be combined together to show possible system design, these features can also be used in other combinations which are not explicitly described. Therefore, unless otherwise stated, the described combination is not intended to be limited.

[0030] The principles and structures of the present application will be described in detail in combination with the drawings and embodiments.

[0031] In the prior art, after AI automatic plug-in, the pin residues and AI pin cutting mechanical ash will be left on the PCB, which will affect the subsequent SMT red glue process. The current conventional method is to manually brush the board after AI automatic plug-in. The quality of manual work cannot be guaranteed, and the production capacity is low. Moreover, because the PCB board is a continuous board process, uneven control of manual work effort will damage the continuous board combination and cause the board to break, which will cause the subsequent SMT and the over-peak welding in the later stage to be impossible;

[0032] Please refer to Figure 1 and Figure 2 , in view of the above problems, the present application provides a PCB cleaning device, wherein the PCB cleaning device comprises a push plate mechanism and a cleaning mechanism.

[0033] The cleaning mechanism comprises a fan, and the air outlet of the fan is arranged towards the PCB to be cleaned;

[0034] The push plate mechanism is used for placing and pushing the PCB to be cleaned to move towards the air outlet of the fan, and the push plate mechanism has a control unit, which controls the movement of the push plate mechanism through a push plate signal;

[0035] An electromagnetic valve is arranged at the air source of the fan, which is used for controlling the opening and closing of the air source, and the electromagnetic valve is connected to the control unit, which can control the opening and closing of the electromagnetic valve through a driving signal;

[0036] The push plate signal and the driving signal are triggered at the same time.

[0037] From the above arrangement, it can be seen that in the utility model, the control unit sends a push plate signal and a driving signal respectively, and the two signals are triggered at the same time. After the design, it can ensure that the push plate mechanism and the cleaning mechanism start at the same time, that is, when the PCB to be cleaned is pushed, the cleaning work is carried out synchronously, avoiding subsequent manual cleaning work. Therefore, the utility model realizes automatic cleaning through the above design, reduces labor cost and improves production capacity.

[0038] Please refer to Figure 1 In the utility model, a plurality of air knives for air supply are arranged at the air outlet of the fan, the air source supplies air to the air knives through the air pipe, and the electromagnetic valve is arranged in the air pipe to control the opening and closing of the air source by controlling the opening and closing of the air pipe.

[0039] The 24V+ signal in the above Figure 1 is the control signal, the push plate signal Y7 is the push plate signal mentioned above, and the push plate machine PLC is the control unit. Based on the above structure, the working principle of the utility model is that a 24V control signal is added to the push plate signal of the push plate machine to control the opening of the electromagnetic valve, so that the electromagnetic valve works when the push plate machine starts to push the plate, and the air pressure blows away the dust on the PCB through the electromagnetic valve. At the same time, since the control signal and the push plate signal are synchronized, the electromagnetic valve will also stop working after the push plate is finished.

[0040] Please refer to Figure 2 Based on the above control logic, the control unit of the utility model at least has:

[0041] A push plate signal triggering module for sending a push plate signal;

[0042] A driving signal triggering module for sending a driving signal;

[0043] A sampling feedback module connected to the push plate signal triggering module and the driving signal triggering module, respectively, for detecting whether the push plate signal is triggered, and providing a feedback signal for the driving signal triggering module when the push plate signal is triggered.

[0044] The working principle is that when the plate feeding machine starts to push the plate, the push plate signal trigger module triggers and sends a push plate signal, at this time the sampling feedback module can detect the push plate signal trigger and generate a feedback signal to the driving signal trigger module, the driving signal trigger module is triggered after receiving the feedback signal and sends a driving signal at the same time to control the electromagnetic valve to open. At this time, the plate feeding action of the plate feeding machine and the cleaning action of the cleaning mechanism are performed at the same time, which can clean the PCB board while feeding the plate, avoiding the subsequent manual cleaning process.

[0045] Based on the above principle, the feedback sampling module in the utility model is composed of: a sampling circuit, and a feedback circuit connected with the sampling circuit;

[0046] Here, the sampling circuit is connected to the push plate signal trigger module for detecting whether the push plate signal is triggered;

[0047] The feedback circuit is connected to the driving signal trigger module for obtaining the signal detected by the sampling circuit, judging whether the push plate signal is triggered according to the detected signal, and sending a feedback signal when the push plate signal is triggered.

[0048] Specifically, to realize the above functions, the composition of the sampling circuit is that a sampling resistor is adopted, which is connected with the push plate signal trigger module, and the sampling resistor is powered on and generates a certain voltage when the push plate signal is triggered, the voltage is transmitted to the feedback circuit as a detection signal, and the feedback circuit can judge whether the push plate signal is triggered;

[0049] The composition of the feedback circuit is that a comparator and a triode connected with the comparator are adopted;

[0050] The inverting input end of the comparator is connected to a reference signal, the non-inverting input end of the comparator is connected to the sampling resistor, the output end of the comparator is connected to the base of the triode, the collector of the triode is connected to the power supply, and the emitter of the triode is connected to the driving signal trigger module;

[0051] Based on the above circuit, the working principle of the feedback circuit is:

[0052] When the push plate signal is not triggered, at this time the sampling resistor has no voltage, since the sampling resistor is connected to the non-inverting input end of the comparator, therefore the non-inverting input end of the comparator receives a low-level signal, which is less than the reference signal connected to the inverting input end, therefore the comparator outputs a low-level signal, and the output end of the comparator is connected to the base of the triode, therefore when the comparator outputs a low-level signal, the triode is in the cut-off state, at this time the power supply cannot supply power to the driving signal trigger module, that is, the feedback signal cannot be provided, at this time the driving signal trigger module is not started;

[0053] When the push plate signal is triggered, the voltage on the sampling resistor is obtained, and since the sampling resistor is connected to the non-inverting input terminal of the comparator, the non-inverting input terminal of the comparator receives a high level signal, which is greater than the reference signal connected to the inverting input terminal, so that the comparator outputs a high level signal, and the output terminal of the comparator is connected to the base of the transistor, so that when the comparator outputs a high level signal, the transistor is in a conducting state, at this time, the power supply normally supplies power to the driving signal triggering module, that is, provides a feedback signal, at this time, the driving signal triggering module starts.

[0054] The sampling feedback module further comprises a reference circuit for providing a reference signal for the feedback circuit.

[0055] The reference circuit has at least two voltage dividing resistors connected in series between the power supply and the ground, and the feedback circuit is connected between any two adjacent resistors.

[0056] The specific principle is to set according to resistance voltage division, and the voltage on each resistor in the series circuit is proportional to its resistance value, so that the voltage at each position can be well determined by connecting multiple resistors in series, for example, two 5 ohm resistors are connected in series between a 3V power supply and the ground, at this time, the voltage between the two resistors is equal to 3*5 / (5+5) = 1.5V.

[0057] The utility model discloses can set the voltage of reference signal according to the above-mentioned principle, and it only needs to ensure that the voltage of the non-inverting input terminal of the comparator is higher than the voltage of the reference signal when the push plate signal is triggered, otherwise, when the push plate signal is not triggered, the voltage of the non-inverting input terminal of the comparator is lower than the voltage of the reference signal.

[0058] In other embodiments of the utility model, the inverting input terminal of the comparator can also be directly grounded, and the same technical effect can also be achieved.

[0059] Please refer to Figure 1 In the utility model, the push plate mechanism drives the PCB to be cleaned to move to the position 13 cm below the air outlet of the fan.

[0060] The above-mentioned position can achieve good cleaning effect, in order to realize the above-mentioned setting, the corresponding buckle structure can be arranged on the movement track of the push plate mechanism of the push plate mechanism, and the push plate mechanism is fixed through the buckle structure when the push plate mechanism moves to the position, and at the same time, when the buckle structure is triggered, the corresponding signal is sent to control the push plate mechanism to stop moving, so that the above-mentioned effect can be well achieved.

[0061] Further, the control unit in the utility model can adopt a single-chip microcomputer.

[0062] Please refer to Figure 2 The overall working process of the utility model is as follows:

[0063] When the push plate signal triggering module provides the push plate signal for the push plate mechanism, the push plate signal will be detected by the sampling feedback module at the same time, at this time, the sampling feedback module will send a feedback signal to the driving signal triggering module, after the driving signal triggering module receives the feedback signal, the corresponding driving signal will be sent to the electromagnetic valve, since the electromagnetic valve is connected between the air source of the cleaning mechanism and the fan, therefore, after the electromagnetic valve is turned on, the cleaning mechanism works normally to clean the PCB board;

[0064] At this time, the PCB board to be cleaned can be cleaned synchronously in the process of feeding the board, so that subsequent manual brushing work of the board can be avoided, the labor cost is reduced, and the production capacity is improved.

[0065] Compared with the prior art, the utility model has at least the following beneficial effects:

[0066] The utility model discloses a push plate mechanism and cleaning mechanism, and two mechanisms are controlled through push plate signal and driving signal respectively, the utility model discloses the setting of control unit makes push plate signal and driving signal can trigger simultaneously, makes the PCB board to be cleaned can clean synchronously in the process of feeding the board, need not subsequent manual brushing work of the board, reduces the labor cost, improves the production capacity.

[0067] The above only is the preferred embodiment of the utility model, and does not limit the utility model, and any modification, equivalent replacement and improvement etc. in the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A PCB board cleaning device, comprising a pushing mechanism and a cleaning mechanism, characterized in that, The cleaning mechanism includes a fan, and the air outlet of the fan is positioned facing the PCB board to be cleaned. The pusher mechanism is used to place and push the PCB board to be cleaned toward the air outlet of the fan, and the pusher mechanism has a control unit, which controls the movement of the pusher mechanism through the pusher signal. A solenoid valve is installed at the air source of the fan. The solenoid valve is used to control the opening and closing of the air source. The solenoid valve is connected to the control unit. The control unit can control the opening and closing of the solenoid valve through a drive signal. The pusher signal and the drive signal are triggered simultaneously.

2. The PCB board cleaning device according to claim 1, characterized in that, The fan has multiple air knives at its outlet for supplying air. The air source supplies air to the air knives through an air pipe. The solenoid valve is located in the air pipe and controls the opening and closing of the air source by controlling the opening and closing of the air pipe.

3. The PCB board cleaning device according to claim 1, characterized in that, The control unit has at least: A push plate signal triggering module, which is used to send the push plate signal; A drive signal triggering module, which is used to emit the drive signal; A sampling feedback module is connected to the pusher signal triggering module and the drive signal triggering module respectively, and is used to detect whether the pusher signal is triggered, and to provide a feedback signal to the drive signal triggering module when the pusher signal is triggered.

4. The PCB board cleaning device according to claim 3, characterized in that, The sampling feedback module includes a sampling circuit and a feedback circuit connected to the sampling circuit; The sampling circuit is connected to the pusher signal triggering module and is used to detect whether the pusher signal is triggered. The feedback circuit is connected to the drive signal triggering module and is used to provide feedback signals to the drive signal triggering module.

5. The PCB board cleaning device according to claim 4, characterized in that, The sampling circuit uses a sampling resistor.

6. The PCB board cleaning device according to claim 5, characterized in that, The feedback circuit includes a comparator and a transistor connected to the comparator; The inverting input of the comparator is connected to a reference signal, the non-inverting input of the comparator is connected to the sampling resistor, the output of the comparator is connected to the base of the transistor, the collector of the transistor is connected to the power supply, and the emitter of the transistor is connected to the drive signal trigger module.

7. The PCB board cleaning device according to claim 6, characterized in that, The sampling feedback module also includes a reference circuit for providing a reference signal to the feedback circuit; The reference circuit has at least two voltage divider resistors connected in series between the power supply and ground, and the feedback circuit is connected between any two connected resistors.

8. The PCB board cleaning device according to claim 1, characterized in that, The pusher mechanism moves the PCB board to be cleaned to a position 13 centimeters below the air outlet of the fan.

9. The PCB board cleaning device according to claim 1, characterized in that, The control unit can be a microcontroller.

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