A circuit board transfer docking system and docking method for reflow soldering equipment

Abstract

The invention discloses a circuit board conveying and docking system of a reflow soldering device, comprising a reflow soldering furnace, a pair of parallel circuit board conveying tracks in the furnace and a pair of parallel circuit board conveying tracks outside the furnace; the circuit board in the reflow soldering furnace is constrained between the two circuit board conveying tracks in the furnace and is conveyed along the extension direction of the circuit board conveying tracks in the furnace; the pair of circuit board conveying tracks in the furnace and the pair of circuit board conveying tracks outside the furnace are on the same horizontal straight extension path; the conveying starting ends of the pair of circuit board conveying tracks outside the furnace are provided with circuit board docking modules, and a furnace gate that can be raised and lowered and opened and closed is provided between the conveying end ends of the pair of circuit board conveying tracks in the furnace and the docking unit; smooth and accurate docking and transition are achieved.

Description

Technical Field

[0001] The invention belongs to the field of circuit boards. Background Art

[0002] Reflow soldering is one of the core processes in the field of electronic manufacturing. It plays a key role in the assembly process of electronic products. When the circuit board is in the reflow oven, the temperature rises rapidly to melt the solder paste. The liquid solder wets, diffuses, flows or reflows the pads, component ends and pins of the circuit board to form solder joints.

[0003] Since the reflow oven needs to be closed during operation, the conveying device used to convey the circuit board cannot be made into a completely continuous conveying track. The conveying track must be disconnected at the gate of the reflow oven. This causes the circuit board to transition from the track inside the oven to the track outside the oven when it is conveyed out of the reflow oven. Since the circuit board itself will undergo slight deformation due to the high temperature in the oven, when the disconnection distance between the end of the track inside the oven and the starting point of the track outside the oven is large, when the circuit board is conveyed to the end of the track inside the oven, the front part of the circuit board in the direction of travel has separated from the track inside the oven, but has not yet reached the stage on the track outside the oven. The front lateral position and up and down displacement of the circuit board in the direction of travel may be slightly deflected to a certain extent, resulting in docking failure. Summary of the invention

[0004] Purpose of the invention: In order to overcome the deficiencies in the prior art, the present invention provides a circuit board transfer docking system and docking method for a reflow soldering device to achieve smooth and accurate docking and transition.

[0005] Technical solution: To achieve the above-mentioned purpose, a circuit board conveying and docking system of a reflow soldering device of the present invention comprises a reflow soldering furnace, a pair of parallel circuit board conveying tracks in the furnace and a pair of parallel circuit board conveying tracks outside the furnace;

[0006] The circuit board in the reflow oven is constrained between the circuit board conveying tracks in the two ovens and conveyed along the extension direction of the circuit board conveying tracks in the ovens;

[0007] A pair of circuit board conveying tracks inside the furnace and a pair of circuit board conveying tracks outside the furnace are on the same horizontal straight extension path; a circuit board docking module is provided at the conveying starting end of the pair of circuit board conveying tracks outside the furnace, and a furnace body gate that can be raised and lowered and opened and closed is provided between the conveying end end of the pair of circuit board conveying tracks inside the furnace and the docking unit.

[0008] Furthermore, a single circuit board conveying track in a furnace includes a first straight conveyor belt or conveyor chain extending in a straight line; a first guide bar is extended along the length direction on the upper side of the first straight conveyor belt, and a first guide slot with a thickness not less than that of the circuit board is formed between the first straight conveyor belt and the first guide bar, and the first guide slot extends and passes through along the transmission direction; the straight edges on both sides of the circuit board in the reflow oven are respectively inserted into the first guide slots on the side close to each other of the circuit board conveying tracks in the two ovens along the length direction.

[0009] Furthermore, the single out-of-furnace circuit board conveying track includes a second linear conveyor belt or conveyor chain extending in a straight line; a second guide bar is extended along the length direction on the upper side of the second linear conveyor belt, and a second guide slot with a thickness not less than the thickness of the circuit board is formed between the second linear conveyor belt and the second guide bar.

[0010] Furthermore, the circuit board docking module includes two left-right symmetrical offset correction units.

[0011] Furthermore, the offset correction unit includes a motor with a rotating shaft facing vertically upward, a cylindrical rotating seat is fixedly connected to the upper end of the rotating shaft coaxially, a plunger cylinder with the same outer diameter is coaxially arranged above the cylindrical rotating seat, a cylindrical flexible bag is coaxially arranged between the plunger cylinder and the cylindrical rotating seat, and the upper and lower ends of the cylindrical flexible bag are coaxially sealed and fixedly connected to the outer contour of the lower end of the plunger cylinder and the outer contour of the upper end of the cylindrical rotating seat; a liquid cavity is formed within the enclosure of the cylindrical flexible bag, a piston is arranged in the plunger cylinder, a plunger cylinder bottom wall is arranged at the lower end of the plunger cylinder, and a plunger cavity is formed between the plunger cylinder bottom wall and the piston; a piston driver that can drive the piston to move up and down is arranged on the upper wall of the plunger cylinder; A connecting column is coaxially fixedly connected to the lower side of the bottom wall of the plug cylinder, the connecting column is coaxially in the liquid cavity, a plurality of connecting holes are arranged on one side of the lower end of the connecting column, and the liquid cavity is connected to the plunger cavity through the plurality of connecting holes and the liquid guiding channel in the connecting column; a telescope is coaxially fixedly installed in the cylindrical rotating seat, and the upper end of the telescopic rod of the telescope is fixedly connected to the lower end of the connecting column; the telescope can drive the plunger cylinder to rise and fall; an upper constraint ring and a lower constraint ring are coaxially provided on the outer side of the cylindrical flexible bag; an upper lifter is arranged on one side of the plunger cylinder, and the upper lifter can drive the upper constraint ring to rise and fall; a lower lifter is arranged on one side of the cylindrical rotating seat, and the lower lifter can drive the lower constraint ring to rise and fall.

[0012] Furthermore, in the initial state, the liquid chamber presents a negative pressure when the piston moves upward, and the cylindrical flexible bag is concave and wrinkled toward the side close to the axis. The cylindrical flexible bag that is concave and wrinkled toward the side close to the axis at this time is recorded as a concave cylindrical flexible bag; the cylindrical flexible bags on the two offset correction units are both concave cylindrical flexible bags, and at this time the spacing between the two concave cylindrical flexible bags is greater than the width of the circuit board; and in the initial state, the upper constraint ring and the lower constraint ring are respectively higher and lower than the second guide slot.

[0013] Furthermore, on the basis of the initial state, while the plunger tube is controlled to rise relative to the cylindrical rotating seat, the piston moves downward in the plunger tube, so that the original concave cylindrical flexible bag is tightened and expanded into a cylindrical tube along the axial direction. The cylindrical cylindrical flexible bag at this time is recorded as a tightened cylindrical flexible bag. When the cylindrical flexible bags on the two offset correction units are both tightened cylindrical flexible bags, the distance between the two tightened cylindrical flexible bags is exactly the same as the width of the circuit board.

[0014] Furthermore, a working method of a circuit board transfer docking system of a reflow soldering device:

[0015] After the circuit board is conveyed to the end of the conveying along the extension direction of the circuit board conveying track in the furnace, and continues to be conveyed until the front part of the circuit board in the traveling direction just reaches between the two offset correction units, the piston drivers and telescopes on the two offset correction units are immediately and synchronously controlled to make the plunger cylinders of the two offset correction units rise relative to the cylindrical rotating seat, while the pistons move downward in the plunger cylinders, so that the two original concave cylindrical flexible bags are tightened and expanded into cylindrical shapes along the axial direction. The cylindrical cylindrical flexible bags at this time are recorded as tightened cylindrical flexible bags, and the two offset The cylindrical flexible bags on the correction unit are all changed into tightened cylindrical flexible bags. At this time, the distance between the two tightened cylindrical flexible bags is just consistent with the width of the circuit board, so that the front part of the circuit board in the moving direction is strictly constrained between the two tightened cylindrical flexible bags, thereby achieving lateral alignment; at the same time, the upper lifters and lower lifters on the two offset correction units are synchronously controlled to make the upper constraint rings and lower constraint rings approach each other until the lower surfaces of the two upper constraint rings are the same height as the upper edge of the second guide slot, and the upper surfaces of the two lower constraint rings are the same height as the lower edge of the second guide slot.

[0016] Beneficial effect: when the front part of the circuit board in the traveling direction of the present invention just reaches between the two offset correction units, the two originally concave cylindrical flexible bags are tightened and expanded into a cylindrical tube along the axial direction. At this time, the spacing between the two tightened cylindrical flexible bags is just consistent with the width of the circuit board, so that the front part of the circuit board in the traveling direction is strictly constrained between the two tightened cylindrical flexible bags, thereby achieving lateral alignment; the two upper constraint rings and the two lower constraint rings strictly constrain the height of the front part of the circuit board in the traveling direction to be the same height as the second guide slot, thereby achieving longitudinal alignment; the circuit board continues to be conveyed along the conveying direction, and at the same time, the two rotating shafts are driven to rotate, so that the two offset correction units are adaptively rotated along their respective axes, so that the circuit board continues to be conveyed more smoothly along the conveying direction, until the two sides of the front part of the circuit board in the traveling direction are respectively inserted into the two second guide slots on the side close to each other at the starting points of the two circuit board conveying tracks outside the furnace, thereby achieving precise docking, so that the circuit board can smoothly transition from a pair of parallel and parallel circuit board conveying tracks inside the furnace to a pair of parallel and parallel circuit board conveying tracks outside the furnace. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the overall top-down perspective of the device;

[0018] Figure 2 It is a schematic diagram of the process of a circuit board transitioning from a pair of parallel circuit board conveying tracks in a furnace to docking with a pair of parallel circuit board conveying tracks outside the furnace;

[0019] Figure 3 It is a partial enlarged schematic diagram of three stages in the process of a circuit board transitioning from a pair of parallel circuit board conveying tracks in a furnace to a pair of parallel circuit board conveying tracks outside the furnace;

[0020] Figure 4 It is a schematic diagram of the process of changing the two offset correction units from the initial state to the correction state;

[0021] Figure 5 This is a schematic diagram of the structure of a single offset correction unit in the correction state. DETAILED DESCRIPTION

[0022] The present invention will be further described below in conjunction with the accompanying drawings.

[0023] As attached Figures 1 to 5 A circuit board transfer docking system of a reflow soldering device is shown, Figure 1 The figure shows a reflow oven 1, a pair of parallel circuit board conveying tracks 4 inside the oven and a pair of parallel circuit board conveying tracks 5 outside the oven; the circuit board 6 inside the reflow oven 1 is constrained between the two circuit board conveying tracks 4 inside the oven and conveyed along the extension direction of the circuit board conveying tracks 4 inside the oven.

[0024] A pair of circuit board conveying tracks 4 inside the furnace and a pair of circuit board conveying tracks 5 outside the furnace are on the same horizontal straight extension path; a circuit board docking module 3 is provided at the conveying starting end of the pair of circuit board conveying tracks 5 outside the furnace, and a furnace body gate 2 that can be raised and lowered and opened and closed is provided between the conveying end end of the pair of circuit board conveying tracks 4 inside the furnace and the docking unit 3.

[0025] When the furnace gate 2 is opened upward, a circuit board 6 in the reflow oven 1 is conveyed to the conveying end along the extension direction of the circuit board conveying track 4 in the oven. When the conveying continues, the front part 6a of the circuit board 6 in the traveling direction separates from the circuit board conveying track 4 in the oven along the traveling direction and gradually approaches the conveying starting point of a pair of circuit board conveying tracks 5 outside the oven. Before the front part 6a of the circuit board 6 in the traveling direction reaches the conveying starting point of a pair of circuit board conveying tracks 5 outside the oven, it will first be offset corrected by the docking unit 3 and then docked with the conveying starting point of a pair of circuit board conveying tracks 5 outside the oven.

[0026] like Figure 2As shown in the above figure, a single circuit board conveying track 4 in the furnace includes a first linear conveyor belt 4a or a conveyor chain extending in a straight line; a first guide bar 4b is extended along the length direction on the upper side of the first linear conveyor belt 4a, and a first guide slot 4c with a thickness not less than that of the circuit board 6 is formed between the first linear conveyor belt 4a and the first guide bar 4b, and the first guide slot 4c extends and passes through along the transmission direction.

[0027] In the transmission state, the straight edges on both sides of the circuit board 6 in the reflow oven 1 are respectively inserted into the first guide slots 4c on the sides of the circuit board conveying tracks 4 in the two ovens close to each other along the length direction.

[0028] A single out-of-furnace circuit board conveying track 5 includes a second straight conveyor belt 5a or a conveyor chain extending in a straight line; a second guide bar 5b is extended along the length direction on the upper side of the second straight conveyor belt 5a, and a second guide slot 5c with a thickness not less than that of the circuit board 6 is formed between the second straight conveyor belt 5a and the second guide bar 5b. The second guide slot 5c extends and passes through along the transmission direction. In the transmission state, the straight edges on both sides of the circuit board 6 that has been transmitted from the reflow soldering furnace 1 are respectively inserted into the second guide slots 5c on the sides of the two out-of-furnace circuit board conveying tracks 5 close to each other along the length direction.

[0029] like Figure 3 The circuit board docking module 3 has two left-right symmetrical offset correction units 8.

[0030] like Figure 5 The offset correction unit 8 includes a motor 21 with a rotating shaft 23 facing vertically upward, a cylindrical rotating seat 13 is fixedly connected to the upper end of the rotating shaft 23 coaxially, a plunger tube 17 with the same outer diameter is coaxially arranged above the cylindrical rotating seat 13, a cylindrical flexible bag 7 is coaxially arranged between the plunger tube 17 and the cylindrical rotating seat 13, and the cylindrical flexible bag 7 is made of a flexible composite material consisting of at least a flexible polyethylene inner layer and a nylon fiber outer layer; the upper and lower ends of the cylindrical flexible bag 7 are coaxially sealed and fixedly connected to the outer contour of the lower end of the plunger tube 17 and the outer contour of the upper end of the cylindrical rotating seat 13; a liquid cavity 11 is formed within the enclosed range of the cylindrical flexible bag 7, a piston 16 is arranged in the plunger tube 17, a plunger tube bottom wall 15 is arranged at the lower end of the plunger tube 17, and the plunger tube bottom A plunger cavity 20 is formed between the wall 15 and the piston 16; a piston driver 18 capable of driving the piston 16 to move up and down is arranged on the upper wall of the plunger cylinder 17; a connecting column 14 is coaxially fixedly connected to the lower side of the bottom wall 15 of the plunger cylinder, the connecting column 14 is coaxially in the liquid cavity 11, a plurality of connecting holes 19 are arranged on one side of the lower end of the connecting column 14, and the liquid cavity 11 is connected to the plunger cavity 20 through the plurality of connecting holes 19 and the liquid guide channel in the connecting column 14; a telescope 12 is coaxially fixedly installed in the columnar rotating seat 13, and the upper end of the telescopic rod of the telescope 12 is fixedly connected to the lower end of the connecting column 14; the telescope 12 can drive the plunger cylinder 17 to move up and down; an upper constraint ring 9 and a lower constraint ring 10 are coaxially movable sleeves outside the cylindrical flexible bag 7.

[0031] An upper lifter 25 is provided on one side of the plunger cylinder 17, and the upper lifter 25 can drive the upper constraint ring 9 to move up and down; a lower lifter 26 is provided on one side of the columnar rotating seat 13, and the lower lifter 26 can drive the lower constraint ring 10 to move up and down.

[0032] In the initial state, if Figure 4 In the above figure, the liquid chamber 11 presents negative pressure when the piston 16 moves upward, and the cylindrical flexible bag 7 is concave and wrinkled toward the side close to the axis. The cylindrical flexible bag 7 that is concave and wrinkled toward the side close to the axis at this time is recorded as a concave cylindrical flexible bag 7a; the cylindrical flexible bags 7 on the two offset correction units 8 are both concave cylindrical flexible bags 7a, and the distance between the two concave cylindrical flexible bags 7a is greater than the width of the circuit board 6; and in the initial state, the upper constraint ring 9 and the lower constraint ring 10 are respectively higher and lower than the second guide slot 5c.

[0033] On the basis of the initial state, the plunger tube 17 is controlled to rise relative to the cylindrical rotating seat 13, and the piston 16 moves downward in the plunger tube 17, so that the original concave cylindrical flexible bag 7a is tightened and expanded into a cylindrical shape along the axial direction, such as Figure 4 In the figure below, the cylindrical flexible bag 7 at this time is recorded as a tightened cylindrical flexible bag 7b. When the cylindrical flexible bags 7 on the two offset correction units 8 are both tightened cylindrical flexible bags 7b, the distance between the two tightened cylindrical flexible bags 7b is exactly the same as the width of the circuit board 6.

[0034] Working method and working principle: Step 1, in the initial state, such as Figure 4 In the above figure, the cylindrical flexible bags 7 on the two offset correction units 8 are both concave and wrinkled toward the side close to their own axis, and the cylindrical flexible bags 7 that are concave and wrinkled toward the side close to the axis are recorded as concave cylindrical flexible bags 7a; at this time, the cylindrical flexible bags 7 on the two offset correction units 8 are both concave cylindrical flexible bags 7a, and the distance between the two concave cylindrical flexible bags 7a is greater than the width of the circuit board 6; and in the initial state, the upper constraint ring 9 and the lower constraint ring 10 on the two offset correction units 8 are respectively higher and lower than the second guide slot 5c;

[0035] When the circuit board 6 in the reflow oven 1 completes the preheating, reflow soldering, and vacuum processes, the oven gate 2 is controlled to rise, thereby opening the oven gate 2;

[0036] Step 2: synchronously operate the two first linear conveyor belts 4a, so that a circuit board 6 in the reflow oven 1 is conveyed to the end of the conveying along the extension direction of the circuit board conveying track 4 in the oven, and then continues to be conveyed, so that the front part 6a of the circuit board 6 in the traveling direction is separated from the circuit board conveying track 4 in the oven along the traveling direction, until the front part 6a of the circuit board 6 in the traveling direction just reaches between the two offset correction units 8;

[0037] Since the distance between the two concave cylindrical flexible bags 7a of the two deviation correction units 8 is significantly larger than the width of the circuit board 6, and the upper constraint ring 9 and the lower constraint ring 10 are significantly higher and lower than the circuit board 6 to be constrained, respectively, when the front part 6a of the circuit board 6 in the moving direction just reaches between the two deviation correction units 8, the two deviation correction units 8 do not contact the two sides of the front part 6a of the circuit board 6 in the moving direction; at this time, the two deviation correction units 8 do not constrain the front part 6a of the circuit board 6 in the moving direction;

[0038] If no correction is made at this time, since the front part 6a of the circuit board 6 in the traveling direction has been separated from the original guide rail, the front part 6a of the circuit board 6 in the traveling direction may have a slight horizontal and vertical deviation after derailment, resulting in the inability to dock with the conveying starting end of the circuit board conveying track 5 outside the furnace;

[0039] Step three, when the front part 6a of the circuit board 6 in the moving direction just reaches between the two offset correction units 8, the piston drivers 18 and the telescopes 12 on the two offset correction units 8 are immediately and synchronously controlled, so that the plunger tubes 17 of the two offset correction units 8 rise relative to the cylindrical rotating seat 13, and the piston 16 moves downward in the plunger tube 17, so that the two original concave cylindrical flexible bags 7a are tightened and expanded into a cylindrical tube along the axial direction. The cylindrical cylindrical flexible bag 7 at this time is recorded as a tightened cylindrical flexible bag 7b, and the cylindrical flexible bags 7 on the two offset correction units 8 are all changed into tightened cylindrical flexible bags 7b. At this time, the distance between the two tightened cylindrical flexible bags 7b is just consistent with the width of the circuit board 6, so that the front part 6a of the circuit board 6 in the moving direction is strictly constrained between the two tightened cylindrical flexible bags 7b, thereby achieving lateral alignment, such as Figure 4 The following figure;

[0040] At the same time, the upper lifters 25 and the lower lifters 26 on the two offset correction units 8 are synchronously controlled to make the upper constraint rings 9 and the lower constraint rings 10 approach each other until the lower surfaces of the two upper constraint rings 9 are at the same height as the upper edge of the second guide slot 5c, and the upper surfaces of the two lower constraint rings 10 are at the same height as the lower edge of the second guide slot 5c, so that the height of the front portion 6a of the circuit board 6 in the traveling direction is strictly constrained to be at the same height as the second guide slot 5c, thereby achieving longitudinal alignment, such as Figure 4 The following figure;

[0041] Step four, the circuit board 6 continues to be conveyed along the conveying direction, and at the same time, the two rotating shafts 23 are driven to rotate, so that the two offset correction units 8 can adaptively rotate along their respective axes, so that the circuit board 6 can continue to be conveyed along the conveying direction more smoothly, until the two sides of the front part 6a of the circuit board 6 in the traveling direction are respectively inserted into the two second guide slots 5c on the side close to each other at the conveying starting points of the two circuit board conveying rails 5 outside the furnace, thereby achieving precise docking, so that the circuit board 6 can smoothly transition from a pair of parallel and parallel circuit board conveying rails 4 inside the furnace to a pair of parallel and parallel circuit board conveying rails 5 outside the furnace.

[0042] The above are only preferred embodiments of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A circuit board transfer and docking system for a reflow soldering device, characterized in that: It comprises a reflow soldering furnace (1), a pair of parallel circuit board conveying tracks (4) inside the furnace, and a pair of parallel circuit board conveying tracks (5) outside the furnace; The circuit board (6) in the reflow oven (1) is constrained between two circuit board conveying tracks (4) in the oven and conveyed along the extension direction of the circuit board conveying tracks (4) in the oven; A pair of circuit board conveying tracks (4) inside the furnace and a pair of circuit board conveying tracks (5) outside the furnace are on the same horizontal straight extension path; a circuit board docking module (3) is provided at the conveying starting end of the pair of circuit board conveying tracks (5) outside the furnace, and a furnace gate (2) that can be raised and lowered and opened and closed is provided between the conveying end end of the pair of circuit board conveying tracks (4) inside the furnace and the circuit board docking module (3); The circuit board docking module (3) comprises two left-right symmetrical offset correction units (8); The offset correction unit (8) comprises a motor (21) with a rotating shaft (23) facing vertically upwards, the upper end of the rotating shaft (23) is coaxially fixedly connected to a columnar rotating seat (13), a plunger cylinder (17) with the same outer diameter is coaxially arranged above the columnar rotating seat (13), a cylindrical flexible bag (7) is coaxially arranged between the plunger cylinder (17) and the columnar rotating seat (13), and the upper and lower ends of the cylindrical flexible bag (7) are coaxially sealed and fixedly connected to the outer contour of the lower end of the plunger cylinder (17) and The outer contour of the upper end of the columnar rotating seat (13); a liquid chamber (11) is formed within the enclosed range of the cylindrical flexible bag (7); a piston (16) is arranged in the plunger tube (17); a plunger tube bottom wall (15) is arranged at the lower end of the plunger tube (17); a plunger chamber (20) is formed between the plunger tube bottom wall (15) and the piston (16); a piston driver (18) capable of driving the piston (16) to move up and down is arranged on the upper wall of the plunger tube (17); the plunger tube bottom wall (15) ) is coaxially fixedly connected to the lower side of the connecting column (14), the connecting column (14) is coaxially located in the liquid chamber (11), a plurality of connecting holes (19) are provided on one side of the lower end of the connecting column (14), and the liquid chamber (11) is connected to the plunger chamber (20) through the plurality of connecting holes (19) and the liquid guide channel in the connecting column (14); a telescopic device (12) is coaxially fixedly installed in the columnar rotating seat (13), and the upper end of the telescopic rod of the telescopic device (12) is fixedly connected to the connecting column ( 14) lower end; the telescopic device (12) can drive the plunger tube (17) to move up and down; the outer coaxial movable sleeve of the cylindrical flexible bag (7) is provided with an upper constraint ring (9) and a lower constraint ring (10); an upper lifter (25) is provided on one side of the plunger tube (17), and the upper lifter (25) can drive the upper constraint ring (9) to move up and down; a lower lifter (26) is provided on one side of the columnar rotating seat (13), and the lower lifter (26) can drive the lower constraint ring (10) to move up and down.

2. The circuit board conveying and docking system of the reflow soldering equipment according to claim 1, characterized in that: A single in-furnace circuit board conveying track (4) comprises a first straight conveyor belt (4a) extending in a straight line; a first guide bar (4b) is provided on the upper side of the first straight conveyor belt (4a) extending in a length direction; a first guide slot (4c) having a thickness not less than that of the circuit board (6) is formed between the first straight conveyor belt (4a) and the first guide bar (4b); the first guide slot (4c) extends and penetrates in a transmission direction; the straight edges on both sides of the circuit board (6) in the reflow soldering furnace (1) are respectively inserted into the first guide slots (4c) on the mutually adjacent sides of the two in-furnace circuit board conveying tracks (4) in a length direction.

3. The circuit board conveying and docking system of the reflow soldering equipment according to claim 2, characterized in that: A single out-of-furnace circuit board conveying track (5) comprises a second linear conveyor belt (5a) extending in a straight line; a second guide bar (5b) is provided on the upper side of the second linear conveyor belt (5a) extending in a length direction; a second guide slot (5c) having a thickness not less than that of the circuit board (6) is formed between the second linear conveyor belt (5a) and the second guide bar (5b).

4. The circuit board conveying and docking system of the reflow soldering equipment according to claim 3, characterized in that: In the initial state, the liquid chamber (11) presents a negative pressure when the piston (16) moves upward, and the cylindrical flexible bag (7) is concave and wrinkled toward the side close to the axis. The cylindrical flexible bag (7) that is concave and wrinkled toward the side close to the axis at this time is recorded as a concave cylindrical flexible bag (7a); the cylindrical flexible bags (7) on the two offset correction units (8) are both concave cylindrical flexible bags (7a), and the distance between the two concave cylindrical flexible bags (7a) is greater than the width of the circuit board (6); and in the initial state, the upper constraint ring (9) and the lower constraint ring (10) are respectively higher and lower than the second guide slot (5c).

5. The circuit board conveying and docking system of the reflow soldering equipment according to claim 4, characterized in that: On the basis of the initial state, the plunger tube (17) is controlled to rise relative to the columnar rotating seat (13), while the piston (16) is displaced downward in the plunger tube (17), so that the original concave cylindrical flexible bag (7a) is tightened and expanded into a cylindrical tube along the axial direction. The cylindrical cylindrical flexible bag (7) at this time is recorded as a tightened cylindrical flexible bag (7b). When the cylindrical flexible bags (7) on the two offset correction units (8) are both tightened cylindrical flexible bags (7b), the distance between the two tightened cylindrical flexible bags (7b) is exactly the same as the width of the circuit board (6).

6. The working method of the circuit board transfer and docking system of the reflow soldering equipment according to claim 5: After the circuit board (6) is conveyed to the end of the conveying along the extension direction of the circuit board conveying track (4) in the furnace, and continues to be conveyed until the front part (6a) of the circuit board (6) in the moving direction just reaches between the two offset correction units (8), the piston drivers (18) and the telescoping devices (12) on the two offset correction units (8) are immediately and synchronously controlled, so that the plunger cylinders (17) of the two offset correction units (8) rise relative to the cylindrical rotating seat (13), and the piston (16) moves downward in the plunger cylinder (17), so that the two originally concave cylindrical flexible bags (7a) are tightened and expanded into cylindrical shapes along the axial direction. The cylindrical cylindrical flexible bag (7) at this time is recorded as a tightened cylindrical flexible bag (7b), and the two offset correction units (8) are moved downward in the plunger cylinder (17). The cylindrical flexible bags (7) on the unit (8) are all transformed into tightened cylindrical flexible bags (7b), and at this time, the spacing between the two tightened cylindrical flexible bags (7b) is exactly consistent with the width of the circuit board (6), so that the front part (6a) of the circuit board (6) in the direction of travel is strictly constrained between the two tightened cylindrical flexible bags (7b), thereby achieving lateral alignment; at the same time, the upper lifters (25) and the lower lifters (26) on the two offset correction units (8) are synchronously controlled to make the upper constraint rings (9) and the lower constraint rings (10) approach each other until the lower surfaces of the two upper constraint rings (9) are at the same height as the upper edge of the second guide slot (5c), and the upper surfaces of the two lower constraint rings (10) are at the same height as the lower edge of the second guide slot (5c).

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