Flow adjusting device and wave soldering equipment

Abstract

The utility model relates to the technical field of welding, and particularly discloses a flow adjusting device which comprises a float flowmeter, a first position sensor and / or a second position sensor, the float flowmeter comprises a pipe body and a floater which is arranged in the pipe body and can float up and down in the pipe body; in the first position sensor and / or the second position sensor, the first position sensor is used for detecting whether the floater reaches a first position, and the second position sensor is used for detecting whether the floater reaches a second position. According to the flow adjusting device, flow adjustment is achieved, meanwhile, flow can be monitored in the working process, flow feedback is achieved, and related workers are reminded that the flow reaches the preset flow lower limit or the preset flow lower limit. Product quality is guaranteed to a certain extent, and the reject ratio of products is reduced. The utility model further discloses wave soldering equipment which also has the technical effects.

Description

Technical Field

[0001] The utility model relates to the technical field of welding, and more specifically to a flow regulating device and wave soldering equipment. Background Art

[0002] At present, the welding of printed circuit boards (PCBs) and components mostly uses wave soldering equipment. Wave soldering equipment adopts an automated assembly line operation mode. The PCB is welded on the assembly line through four steps: flux spraying, preheating, wave soldering, and cooling. The PCB flows one by one on the assembly line without stopping. Among them, the flux spraying is to spray the flux evenly on the bottom of the PCB through the flux nozzle, so as to clean the pads on the PCB and improve the process performance of subsequent welding. Therefore, whether the PCB is sprayed with an appropriate amount of flux will directly affect the welding results of the PCB product. When the nozzle sprays normally according to the set flow range, the flux spraying on the bottom of the PCB is good, which can ensure the success rate of welding; when the nozzle fails to spray normally according to the set flow range, the flux spraying on the bottom of the PCB is poor, which is very likely to cause welding failure.

[0003] At present, the flux spraying in wave soldering equipment mainly uses the liquid supply system and the air supply system to make the nozzle spray out the right amount of flux. The flux spraying flow is mostly regulated by the float flowmeter, which can adjust a flow value. When the whole spraying system is operating normally, the flux spraying flow is normal. However, when the spraying system is abnormal, the flux spraying flow may exceed the normal range, resulting in defective PCB products, causing great rework or scrap. For today's SMT (Surface Mount Technology) electronics industry, the integration of PCB products is getting higher and higher, and the cost is getting more and more expensive. The price of a single large server motherboard is close to US$1,000. If the PCB product welding fails due to poor flux spraying, manual repair and secondary welding are difficult to achieve the expected results, and the losses caused are very huge.

[0004] In summary, how to effectively solve the problem of abnormal flux spraying flow of wave soldering equipment leading to decreased product yield is a problem that technical personnel in this field need to solve. Utility Model Content

[0005] In view of this, the purpose of the utility model is to provide a flow regulating device and a wave soldering equipment, the structural design of which can effectively solve the problem of abnormal flux spraying flow of the wave soldering equipment leading to a decrease in product yield.

[0006] In order to achieve the above object, the utility model provides the following technical solutions:

[0007] A flow regulating device, comprising:

[0008] A float flowmeter, the float flowmeter comprising a tube body and a float disposed in the tube body and capable of floating up and down in the tube body;

[0009] A first position sensor and / or a second position sensor, the first position sensor is used to detect whether the float reaches a first position, and the second position sensor is used to detect whether the float reaches a second position, wherein the first position and the second position are respectively the position of the float corresponding to a preset upper flow limit and a preset lower flow limit.

[0010] Optionally, in the above-mentioned flow regulating device, the float flowmeter includes a support frame, the tube body is arranged on the support frame, and the first position sensor and / or the second position sensor is arranged on the support frame.

[0011] Optionally, in the above-mentioned flow regulating device, the first position sensor and / or the second position sensor is slidably disposed on the support frame along the axial direction of the tube body, and can be locked at different positions of the sliding stroke.

[0012] Optionally, in the above-mentioned flow regulating device, the support frame is provided with a strip-shaped through hole parallel to the tube body, and the first position sensor and / or the second position sensor is penetrated through the strip-shaped through hole and detachably connected to the support frame via fasteners.

[0013] Optionally, in the above-mentioned flow regulating device, the support frame includes support parts respectively arranged at both ends of the tube body and side plates connected between the two support parts, the strip-shaped through holes are opened in the side plates, the two support parts are respectively provided with channels connected to the tube body and joints are provided on the support parts connected to the channels.

[0014] Optionally, in the above-mentioned flow regulating device, both ends of the tube body are detachably connected to the support frame.

[0015] Optionally, in the above-mentioned flow regulating device, the tube body is a glass tube body or a plastic tube body.

[0016] Optionally, in the above-mentioned flow regulating device, the float is a metal float.

[0017] Optionally, in the above-mentioned flow regulating device, the first position sensor and / or the second position sensor is a proximity switch.

[0018] The flow regulating device provided by the utility model comprises a float flowmeter, a first position sensor and / or a second position sensor, wherein the float flowmeter comprises a tube body and a float arranged in the tube body and capable of floating up and down in the tube body; in the first position sensor and / or the second position sensor, the first position sensor is used to detect whether the float reaches a first position, and the second position sensor is used to detect whether the float reaches a second position, wherein the first position and the second position are respectively the position of the float corresponding to the preset upper limit of the flow and the position of the float corresponding to the preset lower limit of the flow.

[0019] The flow regulating device provided by the utility model is applied, and the float flowmeter is adjusted to set its flow value, and the float reaches the corresponding position in the tube body. And by setting the first position sensor and / or the second position sensor, when the float reaches the first position and / or the second position, the first position sensor and / or the second position sensor can detect the position of the float, so that the relevant personnel can know the flow state according to the feedback of the first position sensor and / or the second position sensor, so as to take corresponding measures in time, such as stopping the production line, troubleshooting and handling system abnormalities. In summary, the flow regulating device provided by the present application can realize flow regulation, and at the same time, it can monitor the flow in real time during the working process, realize flow feedback, so as to remind the relevant staff that the flow reaches the preset flow upper limit or the preset flow lower limit. Applying it to wave soldering equipment can ensure the welding quality of PCB to a certain extent, and also greatly reduce the product defective rate and reduce the related economic losses.

[0020] In order to achieve the above purpose, the utility model also provides a wave soldering equipment, which includes any of the above flow regulating devices. Since the above flow regulating device has the above technical effects, the wave soldering equipment with the flow regulating device should also have corresponding technical effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is a structural schematic diagram of a flow regulating device according to a specific embodiment of the utility model.

[0023] The following are marked in the accompanying drawings:

[0024] The float flowmeter 100 , the first position sensor 200 , the second position sensor 300 , the tube body 110 , the float 120 , the support frame 130 , the support portion 131 , the side plate 132 , the strip-shaped through hole 133 , the joint 134 , and the scale 111 . DETAILED DESCRIPTION

[0025] The embodiment of the utility model discloses a flow regulating device and wave soldering equipment to provide an economical flow abnormality reminder device, reduce the defective rate of related products, and reduce the economic losses caused by the flow abnormality.

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] The present application provides a flow regulating device, which is applicable to but not limited to wave soldering equipment, such as a flux spraying system for wave soldering equipment, to achieve the regulation and monitoring of the flux flow. Conventional flux spraying uses a float flowmeter to achieve flow regulation. When the flux spraying system is abnormal, since the float flowmeter does not have a flow feedback function, the PCB with abnormal spraying will continue to flow to the subsequent preheating, wave soldering, and cooling steps until the final manual inspection finds that the welding quality is poor. However, a batch of defective PCB products have been produced in the above process. The following are usually the methods for handling defective products: 1. Directly scrap the product; 2. Manual rework. Due to inconsistent manual operation techniques, it is difficult to ensure the quality of the solder joints; 3. Secondary wave soldering can easily cause mechanical damage and thermal shock to the components of the PCB machine, leading to failure. Based on this, the present application provides a flow regulating device, which, on the basis of the float flowmeter, combined with the setting of the first position sensor and / or the second position sensor, can not only realize flow regulation, but also realize flow feedback, so as to facilitate alarms and other reminders when the flow is abnormal, and promptly remind the relevant personnel of the production line to stop the production line and continue to feed the board for production, and then continue normal production after troubleshooting and handling the abnormality of flux spraying.

[0028] In a specific embodiment, see Figure 1The flow regulating device provided by the utility model includes a float flowmeter 100, a first position sensor 200 and / or a second position sensor 300. The float flowmeter 100 includes a tube body 110 and a float 120 disposed in the tube body 110 and capable of floating up and down in the tube body 110. The specific structure and working principle of the float flowmeter 100 can refer to the setting of the conventional float flowmeter 100, and will not be repeated here. The first position sensor 200 is used to detect whether the float 120 reaches the first position, and the second position sensor 300 is used to detect whether the float 120 reaches the second position, wherein the first position and the second position are respectively the position of the float 120 corresponding to the preset upper limit of the flow rate and the position of the float 120 corresponding to the preset lower limit of the flow rate. The first position sensor 200 and the second position sensor 300 are set accordingly according to the flow range, that is, when the upper limit of the flow rate needs to be monitored, the first position sensor 200 is set accordingly, and when the lower limit of the flow rate needs to be monitored, the second position sensor 300 is set accordingly. It can be understood that the specific positions of the first position and the second position are set according to the specifications of the corresponding float flowmeter 100 and the preset flow upper limit and preset flow lower limit. For example, when the float 120 rises to the first position, the current flow rate reaches the preset flow upper limit, and when the float 120 falls to the second position, the current flow rate reaches the preset flow lower limit. Specifically, the first position sensor 200 is set corresponding to the first position, and the second position sensor 300 is set corresponding to the second position.

[0029] By using the flow regulating device provided by the utility model, the float flowmeter 100 is adjusted to set its flow value, and the float 120 reaches the corresponding position in the tube body 110. And by setting the first position sensor 200 and / or the second position sensor 300, when the float 120 reaches the first position and / or the second position, the first position sensor 200 and / or the second position sensor 300 can detect the position of the float 120, so that the relevant personnel can know the flow state according to the feedback of the first position sensor 200 and / or the second position sensor 300, so as to take corresponding measures in time, such as stopping the production line production, troubleshooting and handling system abnormalities. In summary, the flow regulating device provided by the present application can realize flow regulation while monitoring the flow in real time during the working process, and realize flow feedback to remind the relevant staff that the flow reaches the preset flow lower limit or the preset flow lower limit. Applying it to wave soldering equipment can ensure the welding quality of PCB to a certain extent, and also greatly reduce the product defective rate and reduce related economic losses.

[0030] In some embodiments, the float flowmeter 100 includes a support frame 130, the tube body 110 is disposed on the support frame 130, and the first position sensor 200 and / or the second position sensor 300 are disposed on the support frame 130. By providing the support frame 130, it is convenient to install the tube body 110 and the first position sensor 200 and / or the second position sensor 300, so that when the flow regulating device is assembled on the wave soldering equipment, the support frame 130 can be directly fixed and connected to the corresponding pipeline and circuit, without the need to separately fix the tube body 110 and the first position sensor 200 and / or the second position sensor 300, which is convenient to operate.

[0031] In some embodiments, the first position sensor 200 and / or the second position sensor 300 are slidably arranged on the support frame 130 along the axial direction of the tube body 110, and can be locked at different positions of the sliding stroke. By slidingly connecting the first position sensor 200 and / or the second position sensor 300 with the support frame 130, and the sliding direction is along the axial direction of the tube body 110, the first position sensor 200 and / or the second position sensor 300 are adjusted to slide according to the specific values ​​of the preset flow upper limit and the preset flow lower limit, and locked after sliding to a suitable position, so as to adjust the preset flow upper limit and / or the preset flow lower limit. As set above, when the flow regulating device is applied to different scenes and the preset flow upper limit and / or the preset flow lower limit are different, the position of the first position sensor 200 and / or the second position sensor 300 can be conveniently adjusted to facilitate the reminder of different thresholds. In other embodiments, the first position sensor 200 and / or the second position sensor 300 can also be detachably installed, such as detachably connected to the support frame 130, and the corresponding adjustment can also be achieved by installing it at different positions.

[0032] In some embodiments, the support frame 130 is provided with a strip through hole 133 parallel to the tube body 110, and the first position sensor 200 and / or the second position sensor 300 are inserted into the strip through hole 133 and are detachably connected to the support frame through a fastener. By providing the strip through hole 133, the first position sensor 200 and / or the second position sensor 300 can move along the strip through hole 133. Combined with the fastening effect of the fastener, when the position of the first position sensor 200 and / or the second position sensor 300 needs to be adjusted, the fastener is loosened, and after the first position sensor 200 and / or the second position sensor 300 slides along the strip through hole 133 to a suitable position, the fastener is re-tightened, and the position of the first position sensor 200 and / or the second position sensor 300 is fixed. The fastener can be specifically a bolt or the like. The above-mentioned structure is simple, easy to adjust, and it is convenient to connect the tail end of the first position sensor 200 and / or the second position sensor 300 to an alarm or a controller or the like through a cable or the like. In other embodiments, a slide groove may also be provided on the support frame 130, the first position sensor 200 and / or the second position sensor 300 are provided in the slide groove and can slide along the slide groove, a plurality of snap-fitting parts are provided on the inner wall surface of the slide groove, and corresponding buckles cooperating with the snap-fitting parts are provided on the first position sensor 200 and / or the second position sensor 300. The first position sensor 200 and / or the second position sensor 300 are locked at different positions by engaging the buckles with different snap-fitting parts.

[0033] In some embodiments, the support frame 130 includes support portions 131 respectively disposed at both ends of the tube body 110 and a side plate 132 connected between the two support portions 131, a strip through hole 133 is provided on the side plate 132, and channels communicating with the tube body 110 are respectively provided in the two support portions 131, and a joint 134 is provided on the support portion 131 communicating with the channel. The support portion 131 is provided to cooperate with the tube body 110, and the joint 134 is provided to facilitate access to the fluid. The axis of the joint 134 can be specifically perpendicular to the axis of the tube body 110, reducing the axial length of the flow regulating device, and realizing the change of the fluid flow direction, which is convenient for its installation in equipment requiring flow regulation such as wave soldering equipment. In addition, by providing the side plate 132, support is provided for the installation of the first position sensor 200 and / or the second position sensor 300. Specifically, the side plate 132 is spaced apart from the tube body 110 to provide installation space for the first position sensor 200 and / or the second position sensor 300.

[0034] In some embodiments, a scale 111 is provided on the outer wall of the tube body 110 to indicate the flow rate at each scale corresponding to the position of the float 120. By providing the scale, the flow rate corresponding to the float 120 can be intuitively displayed, and the position adjustment of the first position sensor 200 and the second position sensor 300 is facilitated.

[0035] In some embodiments, both ends of the tube body 110 are detachably connected to the support frame 130. By detachably connecting the tube body 110 and the support frame 130, tube bodies 110 with different precisions can be used as needed to achieve flow regulation with corresponding precision. Of course, the specific connection method between the tube body 110 and the support frame 130 can be set as needed, such as threaded connection, clamping, etc.

[0036] In some embodiments, the tube body 110 is a glass tube body or a plastic tube body. Preferably, a glass tube body with good light transmittance is used to facilitate observation of the position of the float 120 in the tube body 110 .

[0037] In some embodiments, the float 120 is a metal float, which is convenient for cooperating with the first position sensor 200 and / or the second position sensor 300 to accurately detect the position of the float 120 .

[0038] In some embodiments, the first position sensor 200 and / or the second position sensor 300 are proximity switches. The proximity switch can be triggered without direct mechanical contact with the float 120, so it is easy to cooperate with the float 120 without changing the internal structure of the float flowmeter 100. When the float 120 approaches the sensing surface of the proximity switch to the action distance, the proximity switch can be activated without mechanical contact or any pressure, thereby driving the controller to provide control instructions or causing the alarm to output an alarm reminder. Depending on the type of proximity switch, such as when a passive proximity switch, an eddy current proximity switch, a Hall proximity switch or a photoelectric proximity switch is used, the material of the float 120 can be set accordingly. In other embodiments, the first position sensor 200 and / or the second position sensor 300 can also use other conventional sensors that can realize position detection.

[0039] In some embodiments, the flow regulating device includes an alarm, and the first position sensor 200 and the second position sensor 300 are respectively connected to the alarm to output an alarm reminder when the float 120 reaches the first position or the second position. The alarm can be a sound and light alarm, a voice announcer, etc., which are not specifically limited here. By setting the alarm, an alarm can be issued when the flow is abnormal, so that relevant personnel can take emergency measures to reduce the defective rate of products and the waste of materials.

[0040] Based on the flow regulating device provided in the above embodiments, the utility model also provides a wave soldering equipment, which includes any one of the flow regulating devices in the above embodiments. Since the wave soldering equipment adopts the flow regulating device in the above embodiments, please refer to the above embodiments for the beneficial effects of the wave soldering equipment. By setting the flow regulating device, an economical abnormal reminder solution can be provided for the flux spraying system, which ensures the welding quality of the PCB to a certain extent and greatly reduces the defective rate of PCB products caused by abnormal flux spraying. In summary, the wave soldering equipment monitors the spraying state of the flux and issues an alarm in time to handle the abnormal flux spraying, thereby reducing related economic losses and improving the quality and production capacity of PCB products.

[0041] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0042] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A flow regulating device, characterized in that: include: A float flowmeter (100), the float flowmeter (100) comprising a tube body (110) and a float (120) disposed in the tube body (110) and capable of floating up and down in the tube body (110); A first position sensor (200) and / or a second position sensor (300), wherein the first position sensor (200) is used to detect whether the float (120) has reached a first position, and the second position sensor (300) is used to detect whether the float (120) has reached a second position, wherein the first position and the second position are respectively a position of the float (120) corresponding to a preset upper flow limit and a position of the float (120) corresponding to a preset lower flow limit.

2. The flow regulating device according to claim 1, characterized in that: The float flowmeter (100) comprises a support frame (130), the tube body (110) is arranged on the support frame (130), and the first position sensor (200) and / or the second position sensor (300) are arranged on the support frame (130).

3. The flow regulating device according to claim 2, characterized in that: The first position sensor (200) and / or the second position sensor (300) are slidably arranged on the support frame (130) along the axial direction of the tube body (110), and can be locked at different positions of the sliding stroke.

4. The flow regulating device according to claim 3, characterized in that: The support frame (130) is provided with a strip-shaped through hole (133) parallel to the tube body (110); the first position sensor (200) and / or the second position sensor (300) are passed through the strip-shaped through hole (133) and are detachably connected to the support frame (130) via a fastener.

5. The flow regulating device according to claim 4, characterized in that: The support frame (130) comprises support portions (131) respectively arranged at both ends of the tube body (110) and a side plate (132) connected between the two support portions (131); the strip-shaped through hole (133) is provided in the side plate (132); the two support portions (131) are respectively provided with a channel communicating with the tube body (110); and a joint (134) communicating with the channel is provided on the support portion (131).

6. The flow regulating device according to claim 2, characterized in that: Both ends of the tube body (110) are detachably connected to the support frame (130).

7. The flow regulating device according to any one of claims 1 to 6, characterized in that: The tube body (110) is a glass tube body or a plastic tube body.

8. The flow regulating device according to any one of claims 1 to 6, characterized in that: The float (120) is a metal float.

9. The flow regulating device according to any one of claims 1 to 6, characterized in that: The first position sensor (200) and / or the second position sensor (300) is a proximity switch.

10. A wave soldering equipment, characterized in that: It comprises a flow regulating device as described in any one of claims 1 to 9.

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