CN113873783A

CN113873783A - Front butt joint equipment for SMT reflow soldering furnace

Info

Publication number: CN113873783A
Application number: CN202111011024.3A
Authority: CN
Inventors: 葛军锋; 卢祖栋
Original assignee: Ningbo Self Electronics Co Ltd
Current assignee: Ningbo Self Electronics Co Ltd
Priority date: 2021-08-31
Filing date: 2021-08-31
Publication date: 2021-12-31

Abstract

The invention relates to front butt joint equipment of an SMT reflow soldering furnace, which comprises a conveying mechanism capable of conveying a PCB to the reflow soldering furnace, a width adjusting mechanism capable of adjusting the conveying mechanism to enable the conveying mechanism to be suitable for conveying PCBs with different widths, a translation mechanism capable of driving the conveying mechanism to move along a direction perpendicular to the conveying direction of the conveying mechanism, and a lifting mechanism capable of driving the conveying mechanism to move upwards. The utilization rate of the front butt joint equipment of the SMT reflow soldering furnace is high, the production cost of products is saved, and the market competitiveness is improved.

Description

Front butt joint equipment for SMT reflow soldering furnace

Technical Field

The invention relates to the technical field of circuit board production, in particular to front butt joint equipment for an SMT reflow soldering furnace.

Background

The reflow soldering furnace is a welding device used in SMT industry, which can provide automatic and stable heating environment to melt the solder paste in the furnace chamber, so that the electrical components pre-mounted on the PCB and the PCB are reliably combined together through soldering tin.

In the production process, the PCB board is generally carried to the reflow oven through stokehold butt joint equipment, but among the prior art a reflow oven needs to correspond and sets up stokehold butt joint equipment, stokehold butt joint equipment carries the PCB board to the back in the reflow oven, the reflow oven preheats the PCB board, operations such as welding need certain time, stokehold butt joint equipment is in the stop state during this period, thereby make stokehold butt joint equipment low-usage, cause the equipment waste, and a reflow oven corresponds and sets up stokehold butt joint equipment, equipment investment is big, and then make the cost of amortizing to the product higher, be unfavorable for market competition.

Disclosure of Invention

In view of the above problems, the present invention aims to provide an SMT reflow furnace front docking apparatus with high equipment utilization rate and beneficial to reducing the production cost of products.

In order to achieve the purpose, the technical scheme of the invention is as follows: the utility model provides a butt-joint equipment before SMT reflow soldering stove which characterized in that:

the PCB conveying device comprises a conveying mechanism capable of conveying a PCB to a reflow soldering furnace, a width adjusting mechanism capable of adjusting the conveying mechanism to enable the conveying mechanism to be suitable for conveying PCBs with different widths, a translation mechanism capable of driving the conveying mechanism to move along the conveying direction perpendicular to the conveying mechanism, and a lifting mechanism capable of driving the conveying mechanism to move upwards.

Furthermore, the translation mechanism comprises a screw rod arranged in the direction perpendicular to the conveying direction of the conveying mechanism and a first motor capable of driving the screw rod to rotate.

Further, the conveying mechanism comprises a first belt transmission assembly and a second belt transmission assembly which are arranged perpendicular to the length direction of the screw rod and can be driven by the translation mechanism to synchronously move along the length direction of the screw rod.

Further, the width adjusting mechanism comprises a first rail and a second rail which are arranged perpendicular to the length direction of the screw rod and can be driven by the translation mechanism to synchronously move along the length direction of the screw rod, and a first driving assembly which can drive the second rail to move along the length direction of the screw rod;

the first belt transmission assembly and the second belt transmission assembly are respectively arranged on the first track and the second track.

Furthermore, the first driving assembly comprises a sleeve in threaded connection with the screw rod and a second motor capable of driving the sleeve to rotate so as to enable the sleeve to move along the length direction of the screw rod, and the second rail is connected with the sleeve in a matched mode so that the second rail and the sleeve can move synchronously along the length direction of the screw rod.

Furthermore, the lifting mechanism comprises a plurality of vertical rods fixedly connected with the first belt transmission assembly and the second belt transmission assembly and a second driving assembly capable of driving the vertical rods to move upwards, and limiting cylinders capable of enabling the corresponding vertical rods to penetrate through and slide in the limiting cylinders are arranged on the first rail and the second rail.

Furthermore, the first track and the second track are provided with height limiting blocks which enable the corresponding first belt transmission assembly and the corresponding second belt transmission assembly to stop descending after descending to a certain position.

Further, the translation mechanism further comprises a guide rod which is arranged in parallel with the screw rod and penetrates through the first rail and the second rail.

Furthermore, the second driving assembly is driven by an air cylinder or a screw rod.

Further, the screw rod is provided with two screws which are arranged in parallel.

Compared with the prior art, the invention has the advantages that:

through the matching of the screw rod and the first motor, the first belt transmission assembly and the second belt transmission assembly can be driven to synchronously move along the length direction of the screw rod, and after the PCB is conveyed by the first transmission rail for double-rail reflow soldering, the PCB can be conveyed by the second transmission rail for double-rail reflow soldering by the first belt transmission assembly and the second belt transmission assembly moving synchronously for a certain distance along the direction of the screw rod, so that the PCB can be alternately conveyed by the two rails for double-rail reflow soldering, the utilization efficiency of the double-rail reflow soldering is improved, and the bottleneck problem of reflow soldering can be effectively solved; meanwhile, the furnace front butt joint equipment adopts fewer components such as a driving motor, a belt transmission assembly, a track and the like to convey the PCB for the double-track reflow soldering furnace, so that the production cost of products is saved, and the market competitiveness is improved; through the setting of transferring wide mechanism, can be so that the conveying mechanism of this application is applicable to the PCB board of different width, improved the stokehold butt joint equipment suitability of this application.

Drawings

FIG. 1 is a schematic structural diagram of a front butt-joint device of an SMT reflow furnace in the present application.

Fig. 2 is a schematic structural diagram of the front butt joint device of the SMT reflow furnace in the other direction in the present application.

Fig. 3 is a schematic structural diagram of a state of a furnace front butt joint device when the reflow furnace adopts a rail transmission mode.

Fig. 4 is a schematic structural diagram of a state of furnace front butt joint equipment when the reflow oven adopts a mesh bag transmission mode.

Fig. 5 is a schematic top view of the SMT reflow furnace front docking apparatus in the present application.

Fig. 6 is an enlarged schematic view of a portion a in fig. 1.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

Fig. 1 to 6 are schematic structural views illustrating a preferred embodiment of the present invention, and as shown in the drawings, the SMT reflow oven front docking apparatus includes a conveying mechanism capable of conveying the PCB to the reflow oven, a width adjusting mechanism capable of adjusting the conveying mechanism to make the conveying mechanism suitable for conveying PCBs 900 with different widths, a translation mechanism capable of driving the conveying mechanism to move in a direction perpendicular to a conveying direction of the conveying mechanism, and a lifting mechanism capable of driving the conveying mechanism to move upward.

Specifically, the translation mechanism includes a screw 11 disposed perpendicular to the conveying direction of the conveying mechanism, and a first motor 12 capable of driving the screw 11 to rotate. The conveying mechanism comprises a first belt transmission assembly 21 and a second belt transmission assembly 22 which are arranged perpendicular to the length direction of the screw rod 11 and can be driven by a translation mechanism to synchronously move along the length direction of the screw rod 11. The first belt transmission assembly 21 and the second belt transmission assembly 22 both include a driving motor and a transmission belt, and since the belt transmission manner is common, and the structure of the first belt transmission assembly 21 and the second belt transmission assembly 22 can be known by those skilled in the art without creative labor, the detailed structure of the first belt transmission assembly 21 and the second belt transmission assembly 22 is not described in this embodiment.

In the present embodiment, the width adjusting mechanism includes a first rail 31 and a second rail 32 disposed perpendicular to the length direction of the screw rod 11 and driven by the translation mechanism to move synchronously along the length direction of the screw rod 11, and a first driving component capable of driving the second rail 32 to move along the length direction of the screw rod 11; the first and second

belt transferring assemblies

21 and 22 are disposed on the first and

second rails

31 and 32, respectively. Specifically, the first driving assembly includes a sleeve 33 threadedly coupled to the lead screw 11, and a second motor 36 capable of driving the sleeve 33 to rotate so as to move the sleeve 33 along the length direction of the lead screw 11, and the second rail 32 is cooperatively coupled to the sleeve 33 so that the second rail 32 and the sleeve 33 can move synchronously along the length direction of the lead screw 11.

In the working process of the SMT reflow oven front butt joint apparatus of the application, after the first belt transmission assembly 21 and the second belt transmission assembly 22 convey the PCB 900 to a first transmission rail (not shown in the figure) of the dual-rail reflow oven, the first motor 12 is matched with the lead screw 11 to drive the first rail 31 and the second rail 32 to synchronously move along the length direction of the lead screw 11, the first belt transmission assembly 21 arranged on the first rail 31 and the second belt transmission assembly 22 arranged on the second rail 32 also synchronously move to the second rail aligned with the dual-rail reflow oven to convey the PCB 900 for the first belt transmission assembly 21 and the second belt transmission assembly 22, after the conveying is finished, the first belt transmission assembly 21 and the second belt transmission assembly 22 can also move back again under the matching action of the first motor 12 and the lead screw 11 to provide the PCB for the first transmission rail of the dual-gauge reflow oven again.

So, the problem that double track reflow soldering stove adopted current front end conveying mechanism efficiency not high can effectively be solved in translation mechanism's setting, and the cooperation through first motor 12 and lead screw 11 makes first belt transmission assembly 21 and second belt transmission assembly 22 round trip movement between the double track way to first track and second track in giving the reflow soldering stove make a round trip and provide the PCB board, thereby improve stokehold butt joint equipment's utilization efficiency greatly. Of course, it should be noted that, both the two conveying tracks of the reflow oven are not used at the same time, and the first belt conveying assembly 21 and the second belt conveying assembly 22 may be set by the program of the apparatus without conveying the PCB board 900 to the second conveying track of the reflow oven.

When the PCB 900 with different width models needs to be produced and processed, the sleeve 33 is driven by the second motor 36 to move along the length direction of the screw rod 11 through the cooperation of the second motor 36, the sleeve 33 and the screw rod 11, so that the second rail 32 connected with the sleeve 33 in a matching manner and the sleeve 33 synchronously move, and the adjustment of the distance between the first rail 31 and the second rail 32 is realized, that is, the distance between the first belt transmission assembly 21 and the second belt transmission assembly 22 is adjusted, so that the PCB 900 with different widths can be transmitted. The sleeve 33 and the second rail 32 may be coupled to each other by a bearing or the like.

In the present embodiment, the above-described translation mechanism further includes a guide bar 13 disposed in parallel with the lead screw 11 and passing through the first rail 31 and the second rail 32. Through the setting of guide bar 13, can improve the accuracy nature of first track 31 and the translation of second track 32 on the one hand, on the other hand can share the bearing of lead screw 11, avoids long-time back lead screw 11 to warp, improves the accuracy and the reliability of equipment operation.

In this embodiment, the two lead screws 11 are arranged in parallel, and since the first belt transmission assembly 21 and the second belt transmission assembly 22 have a certain length, the two lead screws 11 can improve the accuracy of the synchronous movement of the two ends of the first belt transmission assembly 21 and the second belt transmission assembly 22, and the problem that the PCB 900 drops off due to the fact that the first belt transmission assembly 21 and the second belt transmission assembly 22 are inclined is avoided. When two lead screws 11 are adopted, two first motors 12 can be adopted to respectively drive, certainly, in order to save cost, one first motor 12 can be adopted and can be realized, only parts such as a belt or a chain need to be added, the realization modes are common in the prior art, and detailed display is not carried out in the embodiment and the attached drawings.

It should be further described that, when two lead screws 11 are used, two second motors 36 may be provided, but in order to save cost, it may also be implemented that one second motor 36 is used in this embodiment, that is, the two lead screws 11 are respectively sleeved with the sleeves 33, the second motor 36 directly drives one of the sleeves 33 in a belt or chain manner, and then the two sleeves 36 are connected through a belt or chain transmission, that is, the first driving assembly further includes a belt or chain structure, and the attached drawing shows a case of using a chain 35 for transmission.

In this embodiment, the lifting mechanism includes a plurality of vertical bars 41 fixedly connected to the first belt transmission assembly 21 and the second belt transmission assembly 22, and a second driving assembly for driving the vertical bars 41 to move upward, and the first rail 31 and the second rail 32 are provided with a limiting cylinder 34 for allowing the corresponding vertical bar 41 to pass therethrough and to slide therein. By arranging the limiting cylinder 34, the first rail 31 and the first belt transmission assembly 21 and the second rail 32 and the second belt transmission assembly 22 can synchronously move along the length direction of the screw rod 11, and perform relative movement in the vertical direction.

The reason for arranging the lifting mechanism is that the transmission mode of the PCB 900 in the reflow oven has two modes, namely a track transmission mode and a mesh bag transmission mode, and the transmission track is located above the mesh bag, so that the lifting mechanism needs to be arranged to enable the stokehole docking equipment of the application to be suitable for the transmission track and the mesh bag to convey the PCB 900.

Specifically, the track transmission mode is generally suitable for heating and processing of a single-sided PCB, and when the reflow soldering furnace adopts the track transmission mode, the state of the furnace front butt joint equipment is shown in fig. 3; the mesh bag transmission mode is suitable for the PCB which needs to be subjected to double-sided heating processing, and when the reflow soldering furnace adopts the mesh bag transmission mode, the state diagram of the furnace front butt joint equipment is shown in fig. 4.

When the reflow oven heats the PCB 900 in the rail transmission mode, the PCB 900 is easily deformed by heat due to the suspension state between the two transmission rails, and if the mesh bag transmission mode is adopted, the problem of deformation of the PCB 900 is much reduced, but for PCBs requiring double-sided heating, when the other surface is heated continuously for mounting after the mounting of the components on one surface is finished, if the mesh bag transmission mode is still adopted, the mounted components are damaged by heat, so that the heating of the other surface can only adopt a rail transmission mode, that is, the mesh bag transmission mode needs to be switched to the rail transmission mode, since there is a height difference between the two transmission modes, in order to smoothly feed the PCB into the reflow furnace, the heights of the first batch credit transmission unit 21 and the second belt transmission unit 22 need to be adjusted by the lifting mechanism.

In the embodiment, the first track 31 and the second track 32 are provided with the height limiting blocks 44 for stopping descending after the corresponding first belt transmission assembly 21 and the second belt transmission assembly 22 descend to a certain position, that is, the ascending of the first belt transmission assembly 21 and the second belt transmission assembly 22 is driven by the second driving assembly, and the descending is realized by the self-weight action of the first belt transmission assembly 21 and the second belt transmission assembly 22, so that the energy consumption of the second driving assembly can be saved. Through the arrangement of the height limiting block 44, the heights of the first belt transmission assembly 21 and the second belt transmission assembly 22 of the furnace front butt joint device are conveniently switched between the transmission track and the mesh bag of the reflow soldering furnace. Of course, the height limiting block 44 is not provided, but the lower end of the vertical rod 41 is fixedly connected with the second driving component, and the height of the first belt transmission component 21 and the height of the second belt transmission component 22 are adjusted through the program setting of the second driving component, so that the above function can be realized.

In this embodiment, the second driving assembly may be driven by the air cylinder 43 or by a screw rod. No matter how, second drive assembly upper end sets up a ejector pad 42, and second drive assembly only need can upwards promote montant 41 certain distance through ejector pad 42 can. The figure shows a schematic diagram of the second driving assembly in a cylinder 43 driving manner.

It should be noted that the stokehole docking facility of the present application further includes a rack 5, a controller, and other structures, which are not improved in the present application and are not described in detail herein.

While embodiments of the invention have been shown and described, it will be understood by those skilled in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. The utility model provides a butt-joint equipment before SMT reflow soldering stove which characterized in that:

the PCB conveying device comprises a conveying mechanism capable of conveying a PCB (900) to a reflow oven, a width adjusting mechanism capable of adjusting the conveying mechanism to enable the conveying mechanism to be suitable for conveying PCBs (900) with different widths, a translation mechanism capable of driving the conveying mechanism to move along a direction perpendicular to the conveying direction of the conveying mechanism, and a lifting mechanism capable of driving the conveying mechanism to move upwards.

2. An SMT reflow oven front docking device according to claim 1, wherein:

the translation mechanism comprises a screw rod (11) arranged in the direction perpendicular to the conveying direction of the conveying mechanism and a first motor (12) capable of driving the screw rod (11) to rotate.

3. An SMT reflow oven front docking device according to claim 2, wherein:

the conveying mechanism comprises a first belt transmission assembly (21) and a second belt transmission assembly (22) which are arranged perpendicular to the length direction of the screw rod (11) and can be driven by a translation mechanism to synchronously move along the length direction of the screw rod (11).

4. An SMT reflow oven front docking device according to claim 3, wherein:

the width adjusting mechanism comprises a first rail (31) and a second rail (32) which are arranged perpendicular to the length direction of the screw rod (11) and can be driven by the translation mechanism to synchronously move along the length direction of the screw rod (11), and a first driving component which can drive the second rail (32) to move along the length direction of the screw rod (11);

the first belt transmission assembly (21) and the second belt transmission assembly (22) are respectively arranged on the first rail (31) and the second rail (32).

5. An SMT reflow oven front docking device according to claim 4, wherein:

the first driving assembly comprises a sleeve (33) in threaded connection with the screw rod (11) and a second motor (36) capable of driving the sleeve (33) to rotate so as to enable the sleeve (33) to move along the length direction of the screw rod (11), and the second rail (32) is connected with the sleeve (33) in a matched mode so that the second rail (32) and the sleeve (33) can move synchronously along the length direction of the screw rod (11).

6. An SMT reflow oven front docking device according to claim 5, wherein:

the lifting mechanism comprises a plurality of vertical rods (41) fixedly connected with a first belt transmission assembly (21) and a second belt transmission assembly (22) and a second driving assembly capable of driving the vertical rods (41) to move upwards, and limiting cylinders (34) capable of enabling the corresponding vertical rods (41) to penetrate through and slide in the limiting cylinders are arranged on the first rail (31) and the second rail (32).

7. An SMT reflow oven front docking device according to claim 6, wherein:

the first track (31) and the second track (32) are provided with height limiting blocks (44) which enable the corresponding first belt transmission assembly (21) and the corresponding second belt transmission assembly (22) to stop descending after descending to a certain position.

8. An SMT reflow oven front docking device according to claim 4, wherein:

the translation mechanism further comprises a guide rod arranged in parallel with the screw rod (11) and passing through the first rail (31) and the second rail (32).

9. An SMT reflow oven front docking device according to claim 6, wherein:

the second driving assembly is driven by a cylinder (43) or a screw rod.

10. An SMT reflow oven front docking device according to claim 8, wherein:

the screw rod (11) is provided with two screws which are arranged in parallel.