Transmission mechanism of reflow soldering machine

Abstract

The invention particularly relates to a transmission mechanism of a reflow soldering machine, which comprises a reflow soldering machine body, the transmission mechanism is assembled on the inner side of the reflow soldering machine body, the transmission mechanism comprises a first servo motor, the first servo motor is assembled on the reflow soldering machine body, the reflow soldering machine body is provided with a rotating shaft, and the rotating shaft is fixedly provided with a transmission gear. A transmission chain is assembled between the front and rear transmission gears on the same side in a transmission mode, the transmission chain comprises a plurality of hinged chains connected in a hinged mode, the transmission chain is fixedly provided with a stabilizing assembly, the stabilizing assembly is fixedly assembled on the hinged chains and comprises a fixing shaft, the fixing shaft is connected with a connecting plate, and the fixing shaft is slidably provided with a stabilizing plate; springs are fixedly assembled between the stabilizing plates and the connecting plates, the reflow soldering machine body is provided with a conveying frame, the conveying frame is provided with a conveying mechanism, the conveying mechanism comprises a second servo motor, the second servo motor is fixedly assembled on the conveying frame, belt wheels are rotationally assembled on the left side and the right side of the conveying frame, and a conveying belt is assembled between the two belt wheels in a transmission mode.

Description

Technical Field

[0001] The present invention belongs to the technical field of reflow soldering transmission, and particularly relates to a transmission mechanism of a reflow soldering machine. Background Art

[0002] In the field of electronic manufacturing, a reflow soldering machine is a core device for completing the surface mounting process of a circuit board. The stability and precision of its transmission mechanism directly determine the welding quality and production efficiency. The transmission systems of traditional reflow soldering machines mostly adopt rigid chain or belt conveying methods, and there are still some technical problems. The traditional clamping mechanism relies on fixed claws or hard baffles to limit the circuit board, lacking a buffer design; when the circuit board (especially a thin board or a flexible substrate) enters the high-temperature welding area, it is prone to edge extrusion deformation due to material thermal expansion or mechanical vibration, and even cause cracking of precision solder joints; in addition, direct contact between metal clamping components and the circuit board may generate electrostatic discharge (ESD), damaging sensitive components; therefore, a transmission mechanism of a reflow soldering machine is provided to solve the above problems. Summary of the Invention

[0003] The purpose of the present invention is to provide a transmission mechanism of a reflow soldering machine to solve the problems existing in the background art.

[0004] To achieve the above technical purpose, the technical solution adopted by the present invention is as follows:

[0005] A transmission mechanism of a reflow soldering machine includes a reflow soldering machine body. A transmission mechanism is assembled inside the reflow soldering machine body. The transmission mechanism includes a first servo motor, and the first servo motor is assembled inside the reflow soldering machine body. Rotating shafts are rotatably assembled on both the left and right sides of the reflow soldering machine body. The output end of the first servo motor is in transmission connection with any one of the rotating shafts. Transmission gears are fixedly assembled on the front and rear sides of the two rotating shafts. Transmission chains are assembled in transmission between the transmission gears on the same side in the front and rear. Each transmission chain includes a plurality of articulated chains hinged together. A plurality of uniformly distributed stabilizing components are fixedly assembled at the opposite ends of the two transmission chains. The stabilizing components are fixedly assembled on the articulated chains;

[0006] The stabilizing component includes a fixed shaft, the fixed shaft is connected with a connecting plate, a stabilizing plate is slidably assembled on the front and rear of the fixed shaft, and a spring is fixedly assembled between the stabilizing plate and the connecting plate;

[0007] On the left side of the reflow soldering machine body, two conveying frames are assembled. The two conveying frames are symmetrically arranged front and back. Conveying mechanisms are assembled at opposite ends of the two conveying frames. The conveying mechanism includes a second servo motor, which is fixedly assembled on the conveying frame. Pulley wheels are rotatably assembled on both the left and right sides of the conveying frame. A conveying belt is drivingly assembled between the two pulley wheels. The output end of the second servo motor is drivingly connected to any one of the pulley wheels.

[0008] Preferably, a tension spring is fixedly assembled between the articulated chain and the connecting plate. The connecting plate is slidably assembled back and forth on the fixed shaft. Tracks are fixedly assembled at both the front and rear ends inside the reflow soldering machine body. Assembly grooves are formed at opposite ends of the two tracks. A number of evenly distributed ceramic rollers are rotatably assembled inside the assembly grooves. The number of the ceramic rollers matches the outer side of the connecting plate. Inclined gradient sections are arranged on both the left and right sides of the tracks.

[0009] Preferably, contact plates are provided on both the lower side of the connecting plate and the upper side of the stabilizing plate.

[0010] Preferably, a receiving plane is formed on the upper side of the fixed shaft.

[0011] Preferably, roughened ceramic gaskets are fixedly assembled at the upper end of the receiving plane and at opposite ends of the front and rear stabilizing plates.

[0012] Preferably, a number of connecting rods are fixedly assembled between the two conveying frames.

[0013] Preferably, three fixed wheels are rotatably provided on the conveying frame. An adjusting wheel is assembled on the conveying frame. The three fixed wheels and the adjusting wheel are distributed in a right trapezoid. An adjusting component is provided between the adjusting wheel and the conveying frame.

[0014] Preferably, the adjusting component includes a strip-shaped slider. The conveying frame is provided with an installation groove and a sliding groove, and the installation groove communicates with the sliding groove. The strip-shaped slider is slidably assembled left and right inside the sliding groove. The adjusting wheel is rotatably assembled on the strip-shaped slider. The strip-shaped slider is fixedly assembled with an installation block. The installation block is slidably assembled left and right in the installation groove. The installation block is threadedly rotatably connected with a fixing knob.

[0015] Advantages of the present invention:

[0016] 1. The spring of the stabilizing component and the tension spring work together to form a dual elastic buffer. The spring provides a flexible pressure when the stabilizing plate contacts the circuit board, avoiding damage to the edge of the circuit board caused by rigid extrusion, especially suitable for brittle PCBs or precision components; the tension spring dynamically adjusts the tension when the connecting plate moves along the track, ensuring smooth clamping action and reducing mechanical shock; combined with the ramp design of the inclined gradient section, it realizes the automatic gradual change of the clamping force with the track position, ensuring a smooth clamping process without jerks; precise clamping and non-offset conveying reduce welding misalignment and lower the defect rates of false soldering and bridging.

[0017] 2. Through the guiding cooperation of the inclined gradient section of the track and the ceramic roller, the connecting plate automatically completes the process during transportation. When entering the inclined section, the connecting plate is adducted by the extrusion of the track, pushing the stabilizing plate to clamp the circuit board. After leaving the inclined section, the tension spring rebounds to reset the stabilizing plate, automatically releasing the clamping, and the whole process does not require manual intervention or sensor control, reducing the system complexity and failure rate.

[0018] 3. The receiving plane provides a large-area horizontal support, reducing the risk of sagging deformation of the circuit board. The roughened ceramic gasket (high friction coefficient, high temperature resistance) increases the friction force of the contact surface, preventing the circuit board from sliding and shifting during transportation, and at the same time avoiding electrostatic damage caused by metal contact. The contact plate design of the stabilizing plate and the connecting plate increases the clamping area, disperses the pressure, and avoids local stress concentration. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention can be further illustrated by the non-limiting embodiments given in the drawings.

[0020] Figure 1 is a schematic structural view of the transmission mechanism of a reflow soldering machine according to the present invention Figure 1 ;

[0021] Figure 2 is Figure 1 the enlarged schematic view at A in

[0022] Figure 3 is a schematic structural view of the transmission mechanism of a reflow soldering machine according to the present invention Figure 2 ;

[0023] Figure 4 is Figure 3 the enlarged schematic view at B in

[0024] Figure 5 is a partial structural schematic view of the transmission mechanism in the present invention;

[0025] Figure 6 is Figure 5 the enlarged schematic view at C in

[0026] Figure 7 is a structural schematic view of the track in the present invention;

[0027] Figure 8 is Figure 7 an enlarged schematic view of the D position in

[0028] The descriptions of the main component symbols are as follows:

[0029] Reflow soldering machine body 1, rotating shaft 11, transmission gear 12, transmission chain 121, articulated chain 122, fixed shaft 13, connecting plate 131, stabilizing plate 132, spring 133, tension spring 134, track 135, assembly groove 1351, ceramic roller 1352, inclined gradient section 136, contact plate 137, receiving plane 138, roughened ceramic gasket 139, conveying frame 14, second servo motor 141, pulley 142, conveyor belt 143, connecting rod 144, fixed wheel 145, adjusting wheel 146, strip-shaped slider 1461, installation groove 1462, sliding groove 1463, installation block 1464, fixing knob 1465. Specific implementation manner

[0030] In order to enable those skilled in the art to better understand the present invention, the technical solution of the present invention will be further described below with reference to the drawings and embodiments.

[0031] As Figure 1 shown, a transmission mechanism of a reflow soldering machine of the present invention includes a reflow soldering machine body 1. A transmission mechanism is assembled inside the reflow soldering machine body 1. The transmission mechanism includes a first servo motor, and the first servo motor is assembled inside the reflow soldering machine body 1. Rotating shafts 11 are rotatably assembled on both the left and right sides of the reflow soldering machine body 1. The output end of the first servo motor is drivingly connected to any one of the rotating shafts 11. When the first servo motor is started, it can drive the rotating shaft 11 to rotate. Transmission gears 12 are fixedly assembled on the front and rear sides of the two rotating shafts 11. Transmission chains 121 are drivingly assembled between the transmission gears 12 on the same front and rear sides. The transmission chain 121 includes a plurality of articulated chains 122 connected by hinges. A plurality of uniformly distributed stabilizing components are fixedly assembled at the opposite ends of the two transmission chains 121. The stabilizing components are fixedly assembled on the articulated chain 122;

[0032] As Figures 5 - 8 shown, the stabilizing component includes a fixed shaft 13. A connecting plate 131 is connected to the fixed shaft 13. A stabilizing plate 132 is slidably assembled on the front and rear sides of the fixed shaft 13. A spring 133 is fixedly assembled between the stabilizing plate 132 and the connecting plate 131. The circuit board can be clamped and fixed by the elasticity of the spring 133;

[0033] A tension spring 134 is fixedly assembled between the articulated chain 122 and the connecting plate 131. The connecting plate 131 is slidably assembled back and forth on the fixed shaft 13. Both the front and rear ends inside the reflow soldering machine body 1 are fixedly assembled with tracks 135. Assembly grooves 1351 are provided at opposite ends of the two tracks 135. A number of evenly distributed ceramic rollers 1352 are rotatably assembled inside the assembly grooves 1351. The number of ceramic rollers 1352 matches the outer side of the connecting plate 131. Inclined gradient sections 136 are provided on both the left and right sides of the track 135. Through the inclined gradient sections 136, the front and rear orientation of the connecting plate 131 can be adjusted, thereby pushing the stabilizing plate 132 to clamp and fix the circuit board. Contact plates 137 are provided on both the lower side of the connecting plate 131 and the upper side of the stabilizing plate 132. The contact plates 137 can increase the contact area between the connecting plate 131 and the ceramic rollers 1352, and the contact plates 137 can increase the contact area between the stabilizing plate 132 and the circuit board. A receiving plane 138 is provided on the upper side of the fixed shaft 13. The receiving plane 138 can better horizontally support the circuit board and can also change the shape of the fixed shaft 13, thereby limiting the front and rear sliding of the connecting plate 131 and the stabilizing plate 132. Roughened ceramic gaskets 139 are fixedly assembled at the upper end of the receiving plane 138 and at opposite ends of the front and rear stabilizing plates 132;

[0034] As Figure 3 shown, two conveying frames 14 are assembled on the left side of the reflow soldering machine body 1. The two conveying frames 14 are symmetrically arranged front and rear. Conveying mechanisms are assembled at opposite ends of the two conveying frames 14. The conveying mechanism includes a second servo motor 141. The second servo motor 141 is fixedly assembled on the conveying frame 14. Pulley wheels 142 are rotatably assembled on both the left and right sides of the conveying frame 14. A conveying belt 143 is drivingly assembled between the two pulley wheels 142. The output end of the second servo motor 141 is drivingly connected to any one of the pulley wheels 142. The circuit board is placed on the two conveying belts 143 for conveying. A number of connecting rods 144 are fixedly assembled between the two conveying frames 14;

[0035] As Figures 2 - 4As shown in the figure, the conveying frame 14 is rotatably provided with three fixed wheels 145, and the conveying frame 14 is equipped with an adjusting wheel 146. The three fixed wheels 145 and the adjusting wheel 146 are distributed in a right trapezoid. An adjusting assembly is provided between the adjusting wheel 146 and the conveying frame 14. By moving the position of the adjusting wheel 146 left and right, the tightness of the conveying belt 143 can be adjusted without affecting the normal conveying of the circuit board. The adjusting assembly includes a strip-shaped slider 1461. The conveying frame 14 is provided with an installation groove 1462 and a sliding groove 1463. The installation groove 1462 is communicated with the sliding groove 1463. The strip-shaped slider 1461 is slidably assembled left and right inside the sliding groove 1463. The adjusting wheel 146 is rotatably assembled on the strip-shaped slider 1461. The strip-shaped slider 1461 is fixedly assembled with an installation block 1464. The installation block 1464 is slidably assembled left and right in the installation groove 1462. The installation block 1464 is threadedly rotatably connected with a fixing knob 1465;

[0036] When using the conveying mechanism and the transmission mechanism to convey the circuit board, the operator uses tools or manually continuously places the circuit board on the conveying mechanism for conveying. The circuit board will be placed on two conveying belts 143. The second servo motor 141 is started to drive the conveying belt 143 and the circuit board to move into the reflow soldering machine body 1. The first servo motor of the transmission mechanism is started at the same time, and the moving fixed shaft 13 is used to connect with the conveying belt 143 to convey the circuit board for the second time. At this time, the circuit board will continue to be conveyed by relying on the fixed shafts 13 on the front and back sides. During the conveying process, the outside of the connecting plate 131 will move along the track 135 until it moves to the inclined gradient section 136 of the track 135. The connecting plate 131 will overcome the elasticity of the tension spring 134 and approach the circuit board relying on the inclined gradient section 136. The connecting plate 131 will compress the spring 133 and push the stabilizing plate 132 towards the circuit board. The circuit board is clamped and fixed by the stabilizing plate 132, and the spring 133 can reduce the hard extrusion of the stabilizing plate 132 on the circuit board and protect the side structure of the circuit board. Until the transmission chain 121 conveys the circuit board to the right side of the reflow soldering machine body 1, the connecting plate 131 and the stabilizing plate 132 can be reset through the next inclined gradient section 136 of the track 135, so as to release the clamping and fixing of the stabilizing plate 132 on the circuit board.

[0037] The above embodiments only exemplarily illustrate the principles and effects of the present invention, rather than limiting the present invention. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A transmission mechanism of a reflow soldering machine, comprising a reflow soldering machine body, wherein the transmission mechanism is installed inside the reflow soldering machine body, and the characteristics are: The transmission mechanism comprises a first servo motor, which is installed inside the reflow soldering machine body. The left and right sides of the reflow soldering machine body are both rotatably equipped with rotating shafts. The output end of the first servo motor is connected to any of the rotating shafts in a transmission manner. The front and rear sides of the two rotating shafts are both fixedly equipped with transmission gears. A transmission chain is installed between the transmission gears on the same side of the front and rear sides. The transmission chain comprises a plurality of hinged chains connected in a hinged manner. A plurality of evenly distributed stabilizing components are fixedly installed at opposite ends of the two transmission chains, and the stabilizing components are fixedly installed on the hinged chains. The stabilizing assembly includes a fixed shaft, the fixed shaft is connected to a connecting plate, the fixed shaft is equipped with a stabilizing plate for forward and backward sliding movement, and a spring is fixedly installed between the stabilizing plate and the connecting plate; Two conveyor frames are installed on the left side of the reflow soldering machine body, and the two conveyor frames are symmetrically arranged front and back. The two conveyor frames are equipped with a conveying mechanism at the opposite end, and the conveying mechanism includes a second servo motor, and the second servo motor is fixedly installed on the conveyor frame. The left and right sides of the conveyor frame are rotatably equipped with pulleys, and a conveying belt is installed between the two pulleys for transmission. The output end of the second servo motor is transmission-connected to any of the pulleys.

2. The transmission mechanism of a reflow soldering machine according to claim 1, characterized in that: A tension spring is fixedly installed between the hinge chain and the connecting plate, and the connecting plate is slidably installed on the fixed shaft. Tracks are fixedly installed on the front and rear ends of the inner side of the reflow soldering machine body, and assembly grooves are opened at the opposite ends of the two tracks. Several evenly distributed ceramic rollers are rotatably installed inside the assembly grooves, and several of the ceramic rollers are matched with the outer side of the connecting plate. Inclined gradient sections are provided on the left and right sides of the track.

3. The transmission mechanism of a reflow soldering machine according to claim 2, characterized in that: The lower side of the connecting plate and the upper side of the stabilizing plate are both provided with contact plates.

4. The transmission mechanism of a reflow soldering machine according to claim 3, characterized in that: A receiving plane is provided on the upper side of the fixed shaft.

5. The transmission mechanism of a reflow soldering machine according to claim 4, characterized in that: The upper end of the receiving plane and the opposite ends of the front and rear stabilizing plates are fixedly equipped with roughened ceramic gaskets.

6. The transmission mechanism of a reflow soldering machine according to claim 1, characterized in that: A plurality of connecting rods are fixedly mounted between the two conveying racks.

7. The transmission mechanism of a reflow soldering machine according to claim 1, characterized in that: The conveying frame is rotatably provided with three fixed wheels, and the conveying frame is equipped with an adjusting wheel. The three fixed wheels and the adjusting wheel are distributed in a right-angle trapezoid, and an adjusting component is provided between the adjusting wheel and the conveying frame.

8. The transmission mechanism of a reflow soldering machine according to claim 7, characterized in that: The adjustment component includes a strip slider, the conveying frame is provided with an installation groove and a slide groove, the installation groove is connected with the slide groove, the strip slider is slidably assembled inside the slide groove, the adjustment wheel is rotatably assembled on the strip slider, the strip slider is fixedly assembled with a mounting block, the mounting block is slidably assembled in the mounting groove, and the mounting block is threadedly rotatably connected with a fixed knob.

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