Three-stage transmission system for reflow soldering apparatus

Abstract

The application discloses a three-section transmission system of a reflow soldering equipment, which comprises a three-section transmission mechanism, two groups of side transmission tables and a center transmission table are connected to the three-section transmission mechanism, the two groups of side transmission tables are connected to opposite ends of the center transmission table, and an auxiliary limiting mechanism is arranged between each group of the side transmission tables and the center transmission table; the center transmission table comprises two movable guide frames, a fourth connecting frame is arranged on one side of the movable guide frame, a pulley is movably connected to the fourth connecting frame, a second conveying belt is sleeved with the pulley, the second conveying belt passes through a plurality of guide rollers and drive wheels, the guide rollers and the drive wheels are arranged on one side of the side transmission table, and a motor is fixedly connected to one side of the drive wheel. The three-section transmission system of the reflow soldering equipment has the effects that the opening and rapid connection of the transmission table can be realized, and the transmission use in different states is realized.

Description

Technical Field

[0001] This invention relates to the field of reflow soldering equipment, and more particularly to a three-stage transmission system for reflow soldering equipment. Background Technology

[0002] A reflow soldering machine, also called a reflow oven, is a device that provides a heating environment to melt solder paste, thereby reliably bonding surface mount components and PCB pads together through the solder paste alloy.

[0003] The solder used in reflow soldering is solder paste. An appropriate amount and type of solder paste is pre-applied to the pads of the circuit board, and then SMT components are placed in their corresponding positions. The solder paste has a certain viscosity, which helps to fix the components in place. The circuit board with the components then enters the reflow soldering equipment. The conveyor system moves the circuit board through various set temperature zones within the equipment. The solder paste undergoes drying, preheating, melting, wetting, and cooling, ultimately soldering the components onto the printed circuit board.

[0004] To enable the transfer of circuit boards between multiple zones, the conveyor system of reflow soldering machines also uses a three-section track. The connection of the three-section track is the primary issue for controlling product quality and ensuring production capacity. The existing connection method of the three-section track is too simple and cannot be matched with the conveyor mode. Summary of the Invention

[0005] This invention discloses a three-section transmission system for reflow soldering equipment, aiming to solve the problem of connecting three-section tracks, which is the primary issue for controlling product quality and ensuring production capacity. The existing three-section track connection method is singular and cannot be matched with the transmission mode.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A three-section transmission system for a reflow soldering equipment includes a three-section transmission mechanism. Two sets of side transmission tables and a central transmission table are connected to the three-section transmission mechanism at the same time. The two sets of side transmission tables are connected to opposite ends of the central transmission table. An auxiliary limiting mechanism is provided between each set of side transmission tables and the central transmission table.

[0008] The central transmission platform includes two movable guide frames, and a fourth connecting frame is provided on one side of the movable guide frame. A pulley is movably connected to the fourth connecting frame, and a second conveyor belt is sleeved on the pulley. The second conveyor belt passes through multiple guide wheels and drive wheels, and the guide wheels and drive wheels are simultaneously provided on one side of the side transmission platform. A motor is fixedly connected to one side of the drive wheel.

[0009] An upper cavity is provided between the tops of the two movable guide frames, and a gate can be inserted into the upper cavity. A spring assembly is provided between the central transmission platform and the two side transmission platforms.

[0010] The bottom end of the central transmission platform is connected to a motor linear guide rail, and Y-axis linkage guide rails are provided on both sides of the motor linear guide rail. The Y-axis linkage guide rails are connected to the bottom of the side transmission platform, and a position sensor is provided between the Y-axis linkage guide rails and the side transmission platform.

[0011] The bottom end of the motor linear guide rail is provided with a lower cavity, and the bottom end of the lower cavity is provided with a base. A lifting drive assembly is provided between the lower cavity and the base. A positioning strip is provided on the outer side of the lower cavity, and side limiting frames are provided on both sides of the base. The side limiting frames are engaged with the positioning strip.

[0012] Part of the second conveyor belt is located inside the side transmission platform, and another part of the second conveyor belt is located outside the side transmission platform. A third connecting frame is fixedly connected to the outer wall of the lower cavity, and a position sensor is installed on the third connecting frame.

[0013] The entire transmission system, equipped with a three-section transmission mechanism, mainly consists of two side transmission platforms and a central transmission platform, connected by the three-section transmission mechanism. When the gate between different temperature zones falls and presses against the upper cavity, or when the connection of the side transmission platforms is unstable, causing the upper cavity to open, the two movable guides move to both sides, opening the gap between the two side transmission platforms and forming two corresponding transmission structures. The upper cavity serves as a cutting point, and the circuit board can be blocked by the gate. When the upper cavity moves upward and merges, the movable guides can return to their original position under the action of the spring group to ensure the minimum connection gap. This allows for the opening and rapid connection of the side transmission platforms, enabling transmission use in different states.

[0014] In a preferred embodiment, the auxiliary limiting mechanism includes a conveyor belt drive seat, and a first conveyor belt surrounds the conveyor belt drive seat. Multiple damping hinge seats are fixedly connected at equal intervals to the inner walls of opposite sides of two first conveyor belts in the same group.

[0015] Each of the damping hinge seats is connected to an L-shaped limiting frame, and each L-shaped limiting frame includes a stop angle that abuts against the bottom of the circuit board. Each side of the first conveyor belt is provided with a first limiting support plate, and the first limiting support plate is located between each group of two rows of L-shaped limiting frames.

[0016] Each of the first limiting support plates has a first guide arc surface at both ends, and the opposite sides of the two first limiting support plates are simultaneously connected to a first connecting frame. The bottom end of the first connecting frame is connected to a hydraulic rod through a flange.

[0017] The hydraulic rod is mounted on a U-shaped bracket, and the top of the U-shaped bracket is provided with multiple limiting holes. The bottom of the first connecting frame is also fixedly connected with multiple limiting rods, and the multiple limiting rods are respectively movably inserted into the multiple limiting holes.

[0018] By incorporating an auxiliary limiting mechanism, when the circuit board enters the side transmission table, multiple L-shaped limiting frames at corresponding positions, under the conveying action of the first conveyor belt and the limiting action of the first guide arc surface and the first limiting support plate, ensure that the abutment angle of the L-shaped limiting frame is exactly against the bottom end of the circuit board. This ensures that the top end of the circuit board is tightly attached to the second conveyor belt inside the side transmission table, preventing poor contact between the circuit board and the second conveyor belt from affecting the transmission of the circuit board. If the three-section transmission mechanism malfunctions, the multiple L-shaped limiting frames and corresponding drive structures can provide an emergency conveying channel to avoid affecting work efficiency.

[0019] In a preferred embodiment, the two sides of the U-shaped bracket are respectively connected to the outer wall of the side transmission table via a base frame, and the bottom end of the plurality of limiting rods on one side is fixedly connected to an extension bracket, and one end of the extension bracket is connected to a second limiting support plate.

[0020] A second guide arc surface is provided at the connection between the second limiting support plate and the extension bracket. A third limiting support plate is fixedly connected to the bottom end of each of the first limiting support plates. The length of the second limiting support plate is longer than the length of the third limiting support plate.

[0021] By setting a third limiting plate and a second limiting plate, as the L-shaped limiting frame continues to move, when it moves to the interval between the second and third limiting plates, the height of the L-shaped limiting frame is adjusted by the third and second limiting plates, so that when it re-aligns with the circuit board's entry position, it does not contact the bottom end of the circuit board. This avoids direct squeezing between the circuit board and the L-shaped limiting frame when the two ends of the circuit board do not provide limiting function, which would cause displacement and wear on the bottom, thus ensuring the normal processing of the circuit board.

[0022] As can be seen from the above, a three-section transmission system for a reflow soldering equipment includes a three-section transmission mechanism. Two sets of side transmission platforms and a central transmission platform are simultaneously connected to the three-section transmission mechanism. The two sets of side transmission platforms are connected to opposite ends of the central transmission platform. An auxiliary limiting mechanism is simultaneously provided between each set of side transmission platforms and the central transmission platform. The central transmission platform includes two movable guide frames, and a fourth connecting frame is provided on one side of each movable guide frame. A pulley is movably connected to the fourth connecting frame, and a second conveyor belt is sleeved on the pulley. The second conveyor belt passes through multiple guide wheels and drive wheels, and the guide wheels and drive wheels are simultaneously located on one side of the side transmission platform. A motor is fixedly connected to one side of the drive wheel. An upper cavity is provided between the tops of the two movable guide frames, and a gate can be inserted into the upper cavity. A spring assembly is provided between the central transmission platform and the two side transmission platforms. The bottom end of the central transmission platform is connected to a motor linear guide rail, and Y-axis linkage guide rails are provided on both sides of the motor linear guide rail. The Y-axis linkage guide rails are connected to the bottom of the side transmission platforms, and a position sensor is provided between the Y-axis linkage guide rails and the side transmission platforms. A lower cavity is provided at the bottom end of the motor linear guide rail, and a base is provided at the bottom end of the lower cavity. A lifting drive assembly is provided between the lower cavity and the base. A positioning strip is provided on the outer side of the lower cavity, and side limiting frames are provided on both sides of the base, with the side limiting frames engaging with the positioning strips. The three-section transmission system of the reflow soldering equipment provided by this invention has the technical effect of enabling the opening and rapid connection of the transmission platform, and realizing transmission use in different states. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of a three-section transmission system for a reflow soldering equipment proposed in this invention.

[0024] Figure 2 This is a top view of a three-section transmission system for a reflow soldering equipment proposed in this invention.

[0025] Figure 3 This is a schematic diagram of the bottom structure of the three-section transmission mechanism of a three-section transmission system for a reflow soldering equipment proposed in this invention.

[0026] Figure 4 This is a schematic diagram of the connection structure between the central drive table and the side drive table of a three-section drive system for a reflow soldering equipment proposed in this invention.

[0027] Figure 5 This is a schematic diagram showing the breakdown of the auxiliary limiting mechanism of a three-section transmission system for a reflow soldering equipment proposed in this invention.

[0028] Figure 6 This is a schematic diagram of the central structure of the auxiliary limiting mechanism of a three-section transmission system for a reflow soldering equipment proposed in this invention.

[0029] Figure 7 This is a schematic diagram of the L-shaped limit frame connection structure of a three-section transmission system for a reflow soldering equipment proposed in this invention.

[0030] In the diagram: 1. Side transmission platform; 2. Central transmission platform; 3. Auxiliary limiting mechanism; 4. Three-section transmission mechanism; 301. First conveyor belt; 302. Conveyor belt drive seat; 303. L-shaped limiting frame; 304. First guide arc surface; 305. First limiting support plate; 306. First connecting frame; 307. Base frame; 308. U-shaped bracket; 309. Hydraulic rod; 310. Limiting through hole; 311. Limiting insertion rod; 312. Extension bracket; 313. Second limiting support plate; 314. Third limiting support plate; 315. Second connecting... 316. Connecting frame; 317. Second guide arc surface; 318. Damping hinge seat; 401. Y-axis linkage guide rail; 402. Position sensor; 403. Motor linear guide rail; 404. Third connecting frame; 405. Lower cavity; 406. Base; 407. Lifting drive assembly; 408. Side limit frame; 409. Positioning bar; 410. Spring assembly; 411. Fourth connecting frame; 412. Movable guide frame; 413. Pulley; 414. Second conveyor belt; 415. Guide wheel; 416. Drive wheel; 417. Gate. Detailed Implementation

[0031] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0032] The three-section transmission system of the reflow soldering equipment disclosed in this invention is mainly used in reflow soldering transmission scenarios.

[0033] Reference Figures 1-4 A three-section transmission system for a reflow soldering equipment includes a three-section transmission mechanism 4, on which two sets of side transmission platforms 1 and a central transmission platform 2 are simultaneously connected, and the two sets of side transmission platforms 1 are connected to opposite ends of the central transmission platform 2. An auxiliary limiting mechanism 3 is provided between each set of side transmission platforms 1 and the central transmission platform 2.

[0034] The central transmission table 2 includes two movable guide frames 412, and a fourth connecting frame 411 is provided on one side of the movable guide frame 412. A pulley 413 is movably connected on the fourth connecting frame 411, and a second conveyor belt 414 is sleeved on the pulley 413. The second conveyor belt 414 passes through multiple guide wheels 415 and drive wheels 416 respectively, and the guide wheels 415 and drive wheels 416 are simultaneously provided on one side of the side transmission table 1. A motor is fixedly connected to one side of the drive wheel 416.

[0035] An upper cavity is provided between the tops of the two movable guide frames 412, and a gate 417 can be inserted into the upper cavity. A spring assembly 410 is provided between the central transmission platform 2 and the two side transmission platforms 1.

[0036] The bottom end of the central transmission table 2 is connected to a motor linear guide rail 403, and Y-axis linkage guide rails 401 are provided on both sides of the motor linear guide rail 403. The Y-axis linkage guide rails 401 are connected to the bottom of the side transmission table 1, and a position sensor 402 is provided between the Y-axis linkage guide rails 401 and the side transmission table 1.

[0037] The bottom end of the motor linear guide 403 is provided with a lower cavity 405, and the bottom end of the lower cavity 405 is provided with a base 406. A lifting drive assembly 407 is provided between the lower cavity 405 and the base 406. A positioning strip 409 is provided on the outer side of the lower cavity 405, and side limit frames 408 are provided on both sides of the base 406. The side limit frames 408 are engaged with the positioning strip 409. The entire transmission system mainly consists of two side transmission platforms 1 and one central transmission platform 2, which are connected by a three-section transmission mechanism 4. When the gate 417 between different temperature zones falls and presses against the upper cavity, or when the connection of the side transmission platform 1 is unstable, causing the upper cavity to open, the two movable guide frames 412 move to both sides accordingly, so that the two side transmission platforms The gap between 1 is opened to form two corresponding transmission structures. The upper cavity serves as the cutting point, and the circuit board can be blocked by the gate 417. When the upper cavity moves up and merges, the movable guide 412 can return to its original position under the action of the spring group 410 to ensure the minimum connection gap. This enables the opening and rapid connection of the side transmission table 1, realizing transmission use in different states. At the same time, the Y-axis transmission is based on the drive of the same motor linear guide 403, and the addition of the position sensor 402 can keep its movement width consistent. The lower cavity 405 is based on the positioning bar 409 and the side limit frame 408, which can further limit the position of the lower cavity 405, thereby determining the planarity and stability of the Z-axis movement.

[0038] Reference Figure 3 In a preferred embodiment, part of the second conveyor belt 414 is located inside the side conveyor table 1, and another part of the second conveyor belt 414 is located outside the side conveyor table 1. A third connecting frame 404 is fixedly connected to the outer wall of the lower cavity 405, and a position sensor 402 is installed on the third connecting frame 404.

[0039] Reference Figures 5-7 In a preferred embodiment, the auxiliary limiting mechanism 3 includes a conveyor belt drive seat 302, and a first conveyor belt 301 is surrounded around the conveyor belt drive seat 302. Multiple damping hinge seats 318 are fixedly connected at equal intervals to the inner walls of opposite sides of the two first conveyor belts 301 in the same group.

[0040] Reference Figures 5-7 In a preferred embodiment, each damping hinge seat 318 is connected to an L-shaped limiting frame 303, and each L-shaped limiting frame 303 includes a stop angle that abuts against the bottom of the circuit board. Each first conveyor belt 301 has a first limiting support plate 305 on one side, and the first limiting support plate 305 is located between each group of two rows of L-shaped limiting frames 303.

[0041] Reference Figures 5-7 In a preferred embodiment, each of the first limiting support plates 305 is provided with a first guiding arc surface 304 at both ends, and the opposite sides of the two first limiting support plates 305 are simultaneously connected to a first connecting frame 306, and the bottom end of the first connecting frame 306 is connected to a hydraulic rod 309 through a flange 316.

[0042] Reference Figures 5-7 In a preferred embodiment, the hydraulic rod 309 is mounted on the U-shaped bracket 308, and the top of the U-shaped bracket 308 is provided with multiple limiting holes 310. The bottom of the first connecting frame 306 is simultaneously fixedly connected with multiple limiting rods 311, and the multiple limiting rods 311 are respectively movably inserted into the multiple limiting holes 310. In the auxiliary limiting mechanism 3, the first conveyor belt 301 is driven to rotate by the conveyor belt drive seat 302, wherein the rotation speed of the conveyor belt drive seat 302 is less than or equal to the rotation speed of the lower speed drive wheel 416. When the circuit board enters the side transmission table 1, the multiple L-shaped limiting frames 303 at the corresponding positions, under the conveying action of the first conveyor belt 301 and the limiting action of the first guide arc surface 304 and the first limiting support plate 305, make the L-shaped limiting frames 303 resist the action of the first conveyor belt 301 and the limiting action of the first guide arc surface 304 and the first limiting support plate 305. The corner is positioned precisely against the bottom of the circuit board to ensure that the top of the circuit board is tightly attached to the second conveyor belt 414 inside the side transmission table 1. This prevents poor contact between the circuit board and the second conveyor belt 414 from affecting the transmission of the circuit board. At the same time, based on the slow movement of the L-shaped limit frame 303, compared with the stationary L-shaped limit frame 303, this structure can reduce the shearing force caused by the speed difference while using the second conveyor belt 414 as the conveying speed, thereby avoiding obstruction to the operation of the circuit board. In addition, if the three-section transmission mechanism 4 malfunctions, the setting of multiple L-shaped limit frames 303 and corresponding drive structures can provide an emergency conveying channel to avoid affecting work efficiency. Furthermore, based on the setting of the hydraulic rod 309, the compression height of the L-shaped limit frame 303 can be changed, thereby adapting to the use of circuit boards of different thicknesses.

[0043] Reference Figures 5-7In a preferred embodiment, the two sides of the U-shaped bracket 308 are respectively connected to the outer wall of the side transmission table 1 through the base frame 307. The bottom end of the plurality of limiting rods 311 on one side is fixedly connected to the extension bracket 312, and one end of the extension bracket 312 is connected to the second limiting support plate 313.

[0044] Reference Figures 5-7 In a preferred embodiment, a second guide arc surface 317 is provided at the connection between the second limiting support plate 313 and the extension bracket 312. A third limiting support plate 314 is fixedly connected to the bottom end of each first limiting support plate 305. The length of the second limiting support plate 313 is longer than the length of the third limiting support plate 314. As the L-shaped limiting frame 303 continues to move, when it moves to the interval between the second limiting support plate 313 and the third limiting support plate 314, it first contacts the second guide arc surface 317, and then contacts the second limiting support plate 314. The top of the support plate 313 makes contact, and during this process, the L-shaped limiting bracket 303 is raised until its other side contacts the third limiting support plate 314. The height of the L-shaped limiting bracket 303 is adjusted so that when it re-aligns with the circuit board's entry position, it does not contact the bottom of the circuit board. This continues until the first limiting support plate 305 modifies its angle and pressing position. This avoids direct pressing between the circuit board and the L-shaped limiting bracket 303 when the two ends of the circuit board do not provide a limiting effect, which could cause displacement and wear on the bottom, thus ensuring the normal processing of the circuit board.

[0045] Working Principle: The entire transmission system mainly consists of two side transmission platforms 1 and one central transmission platform 2, connected by a three-section transmission mechanism 4. When the gate 417 between different temperature zones falls and presses against the upper cavity, or when the connection of the side transmission platform 1 is unstable, causing the upper cavity to open, the two movable guides 412 move to both sides, opening the gap between the two side transmission platforms 1 and forming two corresponding transmission structures. The upper cavity serves as the cutting point, and the gate 417 can block the circuit board. When the upper cavity moves upward and merges, the movable guides 412 can return to their original position under the action of the spring assembly 410 to minimize the connection gap. This allows the side transmission platforms 1 to open and connect quickly. This mechanism enables transmission under different conditions. The Y-axis transmission is driven by the same motor linear guide 403, and the addition of a position sensor 402 ensures consistent movement width. The lower cavity 405, based on the positioning strip 409 and side limiting brackets 408, further restricts its position, thus determining the planarity and stability of the Z-axis movement. In the auxiliary limiting mechanism 3, the first conveyor belt 301 is rotated by the conveyor belt drive seat 302. The rotational speed of the conveyor belt drive seat 302 is less than or equal to the rotational speed of the lower-speed drive wheel 416. When the circuit board enters the side transmission table 1, the multiple L-shaped limiting brackets 303 at corresponding positions, under the transmission action of the first conveyor belt 301 and the... Under the limiting action of the guide arc surface 304 and the first limiting support plate 305, the abutment of the L-shaped limiting frame 303 is just against the bottom end of the circuit board, ensuring that the top of the circuit board is tightly attached to the second conveyor belt 414 inside the side transmission table 1. This avoids poor contact between the circuit board and the second conveyor belt 414, which would affect the transmission of the circuit board. Simultaneously, based on the slow movement of the L-shaped limiting frame 303, compared to a stationary L-shaped limiting frame 303, this structure reduces the shearing force caused by the speed difference while using the second conveyor belt 414 as the conveying speed, thus avoiding obstruction to the operation of the circuit board. Furthermore, if the three-section transmission mechanism 4 malfunctions, the arrangement of multiple L-shaped limiting frames 303 and corresponding drive structures can provide an emergency conveying channel. To avoid impacting work efficiency, and based on the hydraulic rod 309, the extrusion height of the L-shaped limiting frame 303 can be adjusted to accommodate circuit boards of different thicknesses. As the L-shaped limiting frame 303 continues to move, when it reaches the area between the second limiting support plate 313 and the third limiting support plate 314, it first contacts the second guide arc surface 317 until it contacts the top of the second limiting support plate 313. During this process, the L-shaped limiting frame 303 is raised until its other side contacts the third limiting support plate 314, adjusting the height of the L-shaped limiting frame 303 so that it does not contact the bottom of the circuit board when it re-aligns with the board's entry position. This adjustment is continued until the first limiting support plate 305 modifies its angle and extrusion position.This avoids displacement and bottom wear caused by direct compression between the circuit board and the L-shaped limiting bracket 303 when no limiting function is provided at both ends, thus ensuring normal circuit board processing.

[0046] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A three-section transmission system for a reflow soldering machine, comprising a three-section transmission mechanism, characterized in that, The three-section transmission mechanism is simultaneously connected to two sets of side transmission platforms and a central transmission platform, and the two sets of side transmission platforms are connected to opposite ends of the central transmission platform. An auxiliary limiting mechanism is provided between each set of side transmission platforms and the central transmission platform. The central transmission platform includes two movable guide frames, and a fourth connecting frame is provided on one side of the movable guide frame. A pulley is movably connected to the fourth connecting frame, and a second conveyor belt is sleeved on the pulley. The second conveyor belt passes through multiple guide wheels and drive wheels, and the guide wheels and drive wheels are simultaneously provided on one side of the side transmission platform. A motor is fixedly connected to one side of the drive wheel. An upper cavity is provided between the tops of the two movable guide frames, and a gate can be inserted into the upper cavity. A spring assembly is provided between the central transmission platform and the two side transmission platforms. The bottom end of the central transmission platform is connected to a motor linear guide rail, and Y-axis linkage guide rails are provided on both sides of the motor linear guide rail. The Y-axis linkage guide rails are connected to the bottom of the side transmission platform, and a position sensor is provided between the Y-axis linkage guide rails and the side transmission platform. The bottom end of the motor linear guide rail is provided with a lower cavity, and the bottom end of the lower cavity is provided with a base. A lifting drive assembly is provided between the lower cavity and the base. A positioning strip is provided on the outer side of the lower cavity, and side limiting frames are provided on both sides of the base. The side limiting frames are engaged with the positioning strip. The auxiliary limiting mechanism includes a conveyor belt drive seat, and a first conveyor belt (301) is surrounded by the conveyor belt drive seat. Multiple damping hinge seats are fixedly connected at equal intervals on the inner walls of opposite sides of two first conveyor belts in the same group. Each damping hinge seat is connected to an L-shaped limiting frame, and each L-shaped limiting frame includes a corner abutting against the bottom end of the circuit board. A first limiting support plate is provided on one side of each first conveyor belt, and the first limiting support plate is located between two rows of L-shaped limiting frames in each group. The three-section transmission system of the reflow soldering equipment can open and quickly connect the transmission table, enabling transmission use in different states.

2. The three-section transmission system of a reflow soldering equipment according to claim 1, characterized in that, Part of the second conveyor belt is located inside the side transmission platform, and another part of the second conveyor belt is located outside the side transmission platform. A third connecting frame is fixedly connected to the outer wall of the lower cavity, and a position sensor is installed on the third connecting frame.

3. The three-section transmission system of a reflow soldering equipment according to claim 1, characterized in that, Each of the first limiting support plates has a first guide arc surface at both ends, and the opposite sides of the two first limiting support plates are simultaneously connected to a first connecting frame. The bottom end of the first connecting frame is connected to a hydraulic rod via a flange.

4. The three-section transmission system of a reflow soldering equipment according to claim 3, characterized in that, The hydraulic rod is mounted on a U-shaped bracket, and the top of the U-shaped bracket is provided with multiple limiting holes. The bottom of the first connecting frame is also fixedly connected with multiple limiting rods, and the multiple limiting rods are respectively movably inserted into the multiple limiting holes.

5. The three-section transmission system of a reflow soldering equipment according to claim 4, characterized in that, The two sides of the U-shaped bracket are respectively connected to the outer wall of the side transmission platform through the base frame. The bottom end of the multiple limiting rods on one side is fixedly connected to the extension bracket, and one end of the extension bracket is connected to the second limiting support plate.

6. The three-section transmission system of a reflow soldering equipment according to claim 5, characterized in that, A second guide arc surface is provided at the connection between the second limiting support plate and the extension bracket. A third limiting support plate is fixedly connected to the bottom end of each of the first limiting support plates. The length of the second limiting support plate is longer than the length of the third limiting support plate.

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