Three-section type transmission system of reflow soldering equipment

Abstract

The three-section type transmission system of the reflow soldering equipment comprises a three-section type transmission mechanism, the three-section type transmission mechanism is connected with two sets of side edge transmission tables and a center transmission table at the same time, and the two sets of side edge transmission tables are connected to the two opposite ends of the center transmission table; an auxiliary limiting mechanism is arranged between each set of side edge transmission table and the center transmission table at the same time. The center transmission table comprises two movable guide frames, a fourth connecting frame is arranged on one side of each movable guide frame, a pulley is movably connected to the fourth connecting frame, a second conveying belt sleeves the pulley and passes through a plurality of guide wheels and driving wheels, and the guide wheels and the driving wheels are arranged on one side of the side transmission table at the same time. And one side of the driving wheel is fixedly connected with a motor. The three-section type transmission system of the reflow soldering equipment has the advantages that the transmission table can be opened and rapidly connected, and the transmission use effect in different states is achieved.

Description

Technical Field

[0001] The invention relates to the field of reflow soldering equipment, and in particular to a three-stage transmission system of reflow soldering equipment. Background Art

[0002] A reflow soldering machine, also called a reflow soldering machine or a "reflow oven", provides a heating environment to melt the solder paste so that surface mount components and PCB pads are reliably bonded together through the solder paste alloy.

[0003] The solder used in the soldering technology of the reflow soldering machine is solder paste. Apply a proper amount of solder paste in the appropriate form on the pads of the circuit board in advance, and then place the SMT components in the corresponding positions; the solder paste has a certain viscosity to fix the components; then let the circuit board with the components mounted enter the reflow soldering equipment. The conveying system drives the circuit board through the various set temperature zones in the equipment, and the solder paste is dried, preheated, melted, moistened, and cooled to solder the components to the printed circuit board.

[0004] In order to realize the transmission of multiple zones, the conveying system of the reflow soldering machine will also use a three-section track to provide the transmission of circuit boards. The connection problem of the three-section track is the primary problem for controlling product quality and ensuring production capacity. The existing three-section track has a single connection method and cannot match the transmission mode. Summary of the invention

[0005] The invention discloses a three-stage transmission system for reflow soldering equipment, aiming to solve the technical problem that the connection problem of the three-stage track is the primary problem for controlling product quality and ensuring production capacity, and the existing three-stage track has a single connection method and cannot match the transmission mode.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A three-stage transmission system of a reflow soldering device comprises a three-stage transmission mechanism, wherein two sets of side transmission platforms and a central transmission platform are simultaneously connected to the three-stage transmission mechanism, and the two sets of side transmission platforms are connected to the opposite ends of the central transmission platform, and an auxiliary limiting mechanism is simultaneously arranged between each set of the side transmission platforms and the central transmission platform;

[0008] The central transmission platform includes two movable guide frames, and a fourth connecting frame is arranged on one side of the movable guide frame, a pulley is movably connected to the fourth connecting frame, and a second conveyor belt is connected to the outer surface of the pulley, and the second conveyor belt passes through a plurality of guide wheels and a driving wheel respectively, and the guide wheel and the driving wheel are arranged on one side of the side transmission platform at the same time, and a motor is fixedly connected to one side of the driving 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 group 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-direction linkage guide rails are arranged on both sides of the motor linear guide rail, the Y-direction linkage guide rail is connected to the bottom of the side transmission platform, and a position sensor is arranged between the Y-direction linkage guide rail and the side transmission platform;

[0011] 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 group is provided between the lower cavity and the base, a positioning strip is provided on the outer side of the lower cavity, and side limit frames are provided on both sides of the base, and the side limit frames are clamped on 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. The outer wall of the lower cavity is fixedly connected with a third connecting frame, and the position sensor is installed on the third connecting frame.

[0013] By setting up a three-stage transmission mechanism, the entire transmission system is mainly composed of two side transmission platforms and a central transmission platform, and they are connected by a three-stage transmission mechanism. When the gates between different temperature zones fall and squeeze on the upper cavity, or the connection of the side transmission platform is unstable, causing the upper cavity to open, the two movable guide frames move to both sides accordingly, so that the distance between the two side transmission platforms is opened, forming two corresponding transmission structures, and using the upper cavity as the cutting point and the circuit board as the blocking point of the gate, when the upper cavity moves up and merges, the movable guide frame can return to its position under the action of the spring group to ensure the minimization of the connection gap, thereby realizing the opening and rapid connection of the side transmission platform, and realizing the transmission use in different states.

[0014] In a preferred solution, the auxiliary limiting mechanism includes a conveyor belt drive seat, and a first conveyor belt is surrounded by the conveyor belt drive seat, and inner walls of two first conveyor belts on opposite sides of the same group are respectively and equidistantly fixedly connected with a plurality of damping hinge seats;

[0015] Each of the damping hinge seats is respectively connected to an L-shaped limit frame, and each L-shaped limit frame includes an abutment angle, which abuts against the bottom end of the circuit board, and a first limit support plate is respectively provided on one side of each of the first conveyor belts, and the first limit support plate is located between each group of two rows of L-shaped limit frames;

[0016] Both ends of each of the first position-limiting support plates are respectively provided with a first guiding arc surface, and opposite sides of the two first position-limiting support plates are simultaneously connected with a first connecting frame, and the bottom end of the first connecting frame is connected with a hydraulic rod through a flange;

[0017] The hydraulic rod is installed on the U-shaped bracket, and a plurality of limiting through holes are arranged through the top of the U-shaped bracket. A plurality of limiting plug rods are fixedly connected to the bottom end of the first connecting frame, and the plurality of limiting plug rods are movably inserted into the plurality of limiting through holes respectively.

[0018] By providing an auxiliary limiting mechanism, in which, when the circuit board enters the side transmission platform, the multiple L-shaped limiting frames at the corresponding positions, under the transmission action of the first conveyor belt and the limiting action of the first guide arc surface and the first limiting support plate, make the abutment angle of the L-shaped limiting frame just abut against the bottom end of the circuit board, so as to ensure that the top end of the circuit board is tightly fitted on the second conveyor belt inside the side transmission platform, and avoid the poor contact between the circuit board and the second conveyor belt affecting the transmission of the circuit board. If an abnormality occurs in the three-stage transmission mechanism, an emergency conveying channel can be provided by providing multiple L-shaped limiting frames and corresponding drive structures to avoid affecting the work efficiency.

[0019] In a preferred solution, both sides of the U-shaped bracket are connected to the outer wall of the side transmission platform through the bottom frame, wherein the bottom ends of the plurality of limit rods on one side are fixedly connected to an extension bracket, and one end of the extension bracket is connected to a second limit support plate;

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

[0021] By providing a third limit support plate and a second limit support plate, as the L-shaped limit frame continues to move, when it moves to the interval between the second limit support plate and the third limit support plate, the height of the L-shaped limit frame is adjusted by the third limit support plate and the second limit support plate, so that when it overlaps with the entry position of the circuit board again, it does not contact the bottom end of the circuit board, thereby avoiding direct squeezing of the two ends of the circuit board with the L-shaped limit frame to cause displacement and wear on the bottom when no limit effect is provided, thereby ensuring normal processing of the circuit board.

[0022] As can be seen from the above, a three-stage transmission system of a reflow soldering device includes a three-stage transmission mechanism, two groups of side transmission platforms and a central transmission platform are simultaneously connected to the three-stage transmission mechanism, and the two groups of side transmission platforms are connected to the opposite ends of the central transmission platform, and an auxiliary limiting mechanism is simultaneously arranged between each group of the side transmission platforms and the central transmission platform; the central transmission platform includes two movable guide frames, and a fourth connecting frame is arranged on one side of the movable guide frame, a pulley is movably connected to the fourth connecting frame, and a second conveyor belt is connected to the outer surface of the pulley, and the second conveyor belt passes through a plurality of guide wheels and a driving wheel respectively, and the guide wheel and the driving wheel are simultaneously arranged on one side of the side transmission platform, and a motor is fixedly connected to one side of the driving 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, and a spring group is provided between the central transmission platform and the two side transmission platforms; a motor linear guide is connected to the bottom end of the central transmission platform, and Y-direction linkage guides are provided on both sides of the motor linear guide, and the Y-direction linkage guide is connected to the bottom of the side transmission platform, and a position sensor is provided between the Y-direction linkage guide and the side transmission platform; a lower cavity is provided at the bottom end of the motor linear guide, and a base is provided at the bottom end of the lower cavity, and a lifting drive group is provided between the lower cavity and the base, a positioning strip is provided on the outside of the lower cavity, and side limit frames are provided on both sides of the base, and the side limit frames are connected to the positioning strip. The three-stage transmission system of the reflow soldering equipment provided by the present invention has the technical effect of realizing the opening and rapid connection of the transmission platform, and realizing the use of transmission in different states. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 The present invention provides a schematic diagram of the overall structure of a three-stage transmission system for a reflow soldering device.

[0024] Figure 2 A top view of a three-stage transmission system of a reflow soldering device proposed by the present invention.

[0025] Figure 3 The present invention provides a schematic diagram of the bottom structure of a three-stage transmission mechanism of a three-stage transmission system of a reflow soldering device.

[0026] Figure 4 The present invention provides a schematic diagram of the connection structure between a central transmission platform and a side transmission platform of a three-stage transmission system of a reflow soldering device.

[0027] Figure 5 This is a schematic diagram of the disassembly of the auxiliary limiting mechanism of the three-stage transmission system of the reflow soldering equipment proposed by the present invention.

[0028] Figure 6 This is a schematic diagram of the central structure of an auxiliary limiting mechanism of a three-stage transmission system of a reflow soldering device proposed by the present invention.

[0029] Figure 7 The present invention provides a schematic diagram of the L-shaped limit frame connection structure of a three-stage transmission system of a reflow soldering device.

[0030] In the figure: 1, side transmission platform; 2, center transmission platform; 3, auxiliary limiting mechanism; 4, three-stage transmission mechanism; 301, first conveyor belt; 302, conveyor belt driving seat; 303, L-shaped limiting frame; 304, first guide arc surface; 305, first limiting support plate; 306, first connecting frame; 307, bottom frame; 308, U-shaped bracket; 309, hydraulic rod; 310, limiting perforation; 311, limiting plug rod; 312, extension bracket; 313, second limiting support plate; 314, third limiting support plate; 315, second connecting frame Connecting frame; 316, flange; 317, second guiding 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 group; 408, side limit frame; 409, positioning strip; 410, spring group; 411, fourth connecting frame; 412, movable guide frame; 413, pulley; 414, second conveyor belt; 415, guide wheel; 416, driving wheel; 417, gate. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0032] The three-stage transmission system of a reflow soldering device disclosed in the present invention is mainly used in the scenario of reflow soldering transmission.

[0033] Reference Figure 1-Figure 4 A three-stage transmission system of a reflow soldering device includes a three-stage transmission mechanism 4, two sets of side transmission platforms 1 and a central transmission platform 2 are simultaneously connected to the three-stage transmission mechanism 4, and the two sets of side transmission platforms 1 are connected to the opposite ends of the central transmission platform 2, and an auxiliary limiting mechanism 3 is simultaneously arranged between each set of side transmission platforms 1 and the central transmission platform 2;

[0034] The central transmission platform 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 to the fourth connecting frame 411, and a second conveyor belt 414 is connected to the outer surface of the pulley 413, and the second conveyor belt 414 passes through a plurality of guide wheels 415 and a driving wheel 416 respectively, and the guide wheels 415 and the driving wheel 416 are simultaneously provided on one side of the side transmission platform 1, and a motor is fixedly connected to one side of the driving 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 platform 2 is connected to a motor linear guide 403, and Y-direction linkage guides 401 are arranged on both sides of the motor linear guide 403. The Y-direction linkage guide 401 is connected to the bottom of the side transmission platform 1, and a position sensor 402 is arranged between the Y-direction linkage guide 401 and the side transmission platform 1;

[0037] A lower cavity 405 is provided at the bottom end of the motor linear guide 403, and a base 406 is provided at the bottom end of the lower cavity 405, a lifting drive group 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, and the side limit frames 408 are clamped on the positioning strip 409. The entire transmission system is mainly composed of two side transmission platforms 1 and a central transmission platform 2, and they are connected by a three-stage transmission mechanism 4. When the gate 417 between different temperature zones falls and squeezes the upper cavity, or when the connection of the side transmission platform 1 is unstable, resulting in the opening of the upper cavity, the two movable guide frames 412 move to both sides accordingly, so that the two side transmission platforms 1 is opened to form two corresponding transmission structures, and the upper cavity is used 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 frame 412 can return to its position under the action of the spring group 410 to ensure the minimization of the connection gap, thereby realizing the opening and rapid connection of the side transmission platform 1, and realizing the transmission use in different states. At the same time, the transmission of the Y-axis is based on the drive of the same motor linear guide rail 403, and the setting of the position sensor 402 is added to keep its moving width consistent. The lower cavity 405 is based on the setting of the positioning bar 409 and the side limit frame 408, and the position of the lower cavity 405 can be further limited, 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 transmission platform 1, and another part of the second conveyor belt 414 is located outside the side transmission platform 1, the outer wall of the lower cavity 405 is fixedly connected to the third connecting frame 404, and the position sensor 402 is installed on the third connecting frame 404.

[0039] Reference Figure 5-Figure 7 In a preferred embodiment, the auxiliary limiting mechanism 3 includes a conveyor belt drive seat 302, and the conveyor belt drive seat 302 is surrounded by a first conveyor belt 301, and the inner walls of the opposite sides of the two first conveyor belts 301 in the same group are respectively and equidistantly fixedly connected with a plurality of damping hinge seats 318.

[0040] Reference Figure 5-Figure 7 In a preferred embodiment, each damping hinge seat 318 is respectively connected to an L-shaped limit frame 303, and each L-shaped limit frame 303 includes a butt angle, which butts against the bottom end of the circuit board, and a first limit support plate 305 is respectively provided on one side of each first conveyor belt 301, and the first limit support plate 305 is located between each group of two rows of L-shaped limit frames 303.

[0041] Reference Figure 5-Figure 7 In a preferred embodiment, first guide arc surfaces 304 are respectively provided at both ends of each first position limiting support plate 305, and first connecting frames 306 are simultaneously connected to opposite sides of the two first position limiting support plates 305, and the bottom end of the first connecting frame 306 is connected to a hydraulic rod 309 via a flange 316.

[0042] Reference Figure 5-Figure 7 In a preferred embodiment, the hydraulic rod 309 is installed on the U-shaped bracket 308, and the top of the U-shaped bracket 308 is penetrated with a plurality of limiting through holes 310, and the bottom end of the first connecting frame 306 is fixedly connected with a plurality of limiting plug rods 311 at the same time, and the plurality of limiting plug rods 311 are respectively movably inserted into the plurality of limiting through holes 310, and in the auxiliary limiting mechanism 3, the first conveyor belt 301 is driven to rotate by the conveyor belt driving seat 302, wherein the rotation speed of the conveyor belt driving seat 302 is less than or equal to the rotation speed of the driving wheel 416 with a lower speed, and when the circuit board enters the side transmission platform 1, the plurality of L-shaped limiting frames 303 at the corresponding positions are under the transmission 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, so that the L-shaped limiting frame 303 is The corner just touches the bottom end of the circuit board to ensure that the top end of the circuit board is tightly fitted on the second conveyor belt 414 on the inner side of the side transmission platform 1, so as to avoid the poor contact between the circuit board and the second conveyor belt 414 and affect the transmission of the circuit board. At the same time, based on the slow movement of the L-shaped limit frame 303, when the second conveyor belt 414 is used as the conveying speed, compared with the L-shaped limit frame 303 in the static state, this structure can reduce the shear force caused by the speed difference, thereby avoiding obstruction to the operation of the circuit board. At the same time, if an abnormality occurs in the three-stage transmission mechanism 4, an emergency conveying channel can be provided through the setting of multiple L-shaped limit frames 303 and corresponding drive structures to avoid affecting the work efficiency. In addition, based on the setting of the hydraulic rod 309, the extrusion height of the L-shaped limit frame 303 can be changed, so as to adapt to the use of circuit boards of different thicknesses.

[0043] Reference Figure 5-Figure 7In a preferred embodiment, both sides of the U-shaped bracket 308 are connected to the outer wall of the side transmission platform 1 through the base frame 307, wherein the bottom ends of the multiple limiting rods 311 on one side are 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 Figure 5-Figure 7 In a preferred embodiment, a second guiding arc surface 317 is provided at the connection between the second limiting support plate 313 and the extension bracket 312, and the bottom end of each first limiting support plate 305 is fixedly connected to the third limiting support plate 314, and the length of the second limiting support plate 313 is longer than the set 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 with the second guiding arc surface 317 until it contacts with the second limiting support plate 313. The top of the support plate 313 contacts, and in this process, the L-shaped limit frame 303 is lifted until its other side contacts the third limit support plate 314, and the height of the L-shaped limit frame 303 is adjusted so that when it overlaps with the circuit board entry position again, it does not contact the bottom of the circuit board until the first limit support plate 305 modifies its angle and extrusion position, thereby avoiding direct extrusion with the L-shaped limit frame 303 when no limiting effect is provided at both ends of the circuit board, causing displacement and wear on the bottom, thereby ensuring normal processing of the circuit board.

[0045] Working principle: The entire transmission system is mainly composed of two side transmission platforms 1 and a central transmission platform 2, and they are connected by a three-stage transmission mechanism 4. When the gate 417 between different temperature zones falls and squeezes 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 to open the distance between the two side transmission platforms 1, forming two corresponding transmission structures, and using the upper cavity as the cutting point, and under the obstruction of the gate 417, the circuit board can be blocked. When the upper cavity moves up and merges, the movable guide frame 412 can return to its position under the action of the spring group 410 to ensure the minimization of the connection gap, thereby realizing the opening of the side transmission platform 1 and rapid connection. , realizing transmission use in different states, while the transmission of the Y-axis is based on the drive of the same motor linear guide 403, and adding the setting of the position sensor 402 can keep its moving width consistent, and the lower cavity 405 can further limit the position of the lower cavity 405 based on the setting of the positioning bar 409 and the side limit frame 408, thereby determining the planarity and stability of the Z-axis movement, and in the auxiliary limiting mechanism 3, the first conveyor belt 301 is driven to rotate by the conveyor belt driving seat 302, wherein the rotation speed of the conveyor belt driving seat 302 is less than or equal to the rotation speed of the driving wheel 416 with a lower speed, and when the circuit board enters the side transmission platform 1, the multiple L-shaped limit frames 303 at the corresponding positions are under the transmission action of the first conveyor belt 301, and the Under the limiting action of a guiding arc surface 304 and a first limiting support plate 305, the abutting angle of the L-shaped limiting frame 303 is just against the bottom end of the circuit board to ensure that the top end of the circuit board is tightly fitted on the second conveyor belt 414 inside the side transmission platform 1, so as to avoid that the transmission of the circuit board is affected by the poor contact between the circuit board and the second conveyor belt 414. At the same time, based on the slow movement of the L-shaped limiting frame 303, when the second conveyor belt 414 is used as the conveying speed, compared with the L-shaped limiting frame 303 in a stationary state, this structure can reduce the shear force caused by the speed difference, thereby avoiding obstruction to the operation of the circuit board. At the same time, if an abnormality occurs in the three-stage transmission mechanism 4, an emergency conveying channel can be provided through the arrangement of multiple L-shaped limiting frames 303 and corresponding drive structures. To avoid affecting the work efficiency, based on the setting of the hydraulic rod 309, the extrusion height of the L-shaped limit frame 303 can be changed, so as to adapt to the use of circuit boards of different thicknesses. At the same time, as the L-shaped limit frame 303 continues to move, when it moves to the interval between the second limit support plate 313 and the third limit support plate 314, it first contacts the second guide arc surface 317 until it contacts the top of the second limit support plate 313. In this process, the L-shaped limit frame 303 is raised until its other side contacts the third limit support plate 314, and the height of the L-shaped limit frame 303 is adjusted so that when it overlaps with the circuit board entry position again, it does not contact the bottom end of the circuit board until its angle and extrusion position are modified by the first limit support plate 305.This avoids displacement and wear of the bottom caused by direct compression of the L-shaped limit frame 303 when the two ends of the circuit board do not provide a limit function, thereby ensuring normal processing of the circuit board.

[0046] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A three-stage transmission system of a reflow soldering device, comprising a three-stage transmission mechanism (4), characterized in that: The three-stage transmission mechanism (4) is simultaneously connected to two sets of side transmission platforms (1) and a central transmission platform (2), and the two sets of side transmission platforms (1) are connected to opposite ends of the central transmission platform (2), and an auxiliary limiting mechanism (3) is simultaneously arranged between each set of the side transmission platforms (1) and the central transmission platform (2); The central transmission platform (2) comprises two movable guide frames (412), and a fourth connecting frame (411) is arranged on one side of the movable guide frame (412), a pulley (413) is movably connected to the fourth connecting frame (411), and a second conveyor belt (414) is connected to the outer surface of the pulley (413), and the second conveyor belt (414) passes through a plurality of guide wheels (415) and a driving wheel (416), and the guide wheels (415) and the driving wheels (416) are arranged on one side of the side transmission platform (1), and a motor is fixedly connected to one side of the driving wheel (416); An upper cavity is arranged between the tops of the two movable guide frames (412), and a gate (417) can be inserted into the upper cavity. A spring group (410) is arranged between the central transmission platform (2) and the two side transmission platforms (1); The bottom end of the central transmission platform (2) is connected to a motor linear guide rail (403), and Y-direction linkage guide rails (401) are arranged on both sides of the motor linear guide rail (403), the Y-direction linkage guide rail (401) is connected to the bottom of the side transmission platform (1), and a position sensor (402) is arranged between the Y-direction linkage guide rail (401) and the side transmission platform (1); A lower cavity (405) is provided at the bottom end of the motor linear guide rail (403), and a base (406) is provided at the bottom end of the lower cavity (405), a lifting drive group (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), and the side limit frames (408) are clamped on the positioning strip (409).

2. The three-stage transmission system of the reflow soldering equipment according to claim 1, characterized in that: Part of the second conveyor belt (414) is located inside the side transmission platform (1), and another part of the second conveyor belt (414) is located outside the side transmission platform (1). The outer wall of the lower cavity (405) is fixedly connected to the third connecting frame (404), and the position sensor (402) is installed on the third connecting frame (404).

3. The three-stage transmission system of the reflow soldering equipment according to claim 2, characterized in that: The auxiliary limiting mechanism (3) comprises a conveyor belt drive seat (302), and a first conveyor belt (301) is surrounded by the conveyor belt drive seat (302), and inner walls on opposite sides of two first conveyor belts (301) in the same group are respectively and equidistantly fixedly connected with a plurality of damping hinge seats (318).

4. The three-stage transmission system of the reflow soldering equipment according to claim 3, characterized in that: Each of the damping hinge seats (318) is respectively connected to an L-shaped limit frame (303), and each L-shaped limit frame (303) includes an abutment angle, which abuts against the bottom end of the circuit board. A first limit support plate (305) is respectively arranged on one side of each of the first conveyor belts (301), and the first limit support plate (305) is located between each group of two rows of L-shaped limit frames (303).

5. The three-stage transmission system of the reflow soldering equipment according to claim 4, characterized in that: The two ends of each first position-limiting support plate (305) are respectively provided with a first guiding arc surface (304), and the opposite sides of the two first position-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) via a flange (316).

6. The three-stage transmission system of the reflow soldering equipment according to claim 5, characterized in that: The hydraulic rod (309) is installed on the U-shaped bracket (308), and a plurality of limiting through holes (310) are provided through the top end of the U-shaped bracket (308), and a plurality of limiting plug rods (311) are fixedly connected to the bottom end of the first connecting frame (306), and the plurality of limiting plug rods (311) are movably inserted into the plurality of limiting through holes (310) respectively.

7. The three-stage transmission system of the reflow soldering equipment according to claim 6, characterized in that: The two sides of the U-shaped bracket (308) are respectively connected to the outer wall of the side transmission platform (1) through the bottom frame (307), and the bottom ends of the plurality of limit rods (311) on one side are fixedly connected to an extension bracket (312), and one end of the extension bracket (312) is connected to a second limit support plate (313).

8. The three-stage transmission system of the reflow soldering equipment according to claim 7, characterized in that: A second guiding arc surface (317) is provided at the connection between the second limiting support plate (313) and the extension bracket (312), and the bottom end of each of the first limiting support plates (305) is fixedly connected to a third limiting support plate (314), and the length of the second limiting support plate (313) is longer than the set length of the third limiting support plate (314).

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