Circuit board tin pick-up device and tin pick-up method

Abstract

The invention discloses a circuit board tin pick-up device and a tin pick-up method, and belongs to the technical field of circuit board processing. A circuit board to be subjected to tin pick-up is inserted into a loading frame body, and the loading frame body drives the circuit board to rotate by 60 degrees, so that the circuit board directly faces the upper part of a tin liquid box; a circuit board in a loading frame is pushed by a pushing assembly to make contact with tin liquid in a tin liquid box to complete tin dipping work, then a connecting block drives a shifting rod to slide into a sliding hole outside a driving disc again and drives the driving disc and a supporting shaft to rotate, in the same way, a supporting plate drives a downward pressing assembly and the loading frame to rotate, and tin dipping work is completed. The circuit board to be tinned is located above the tin liquid box, so that the circuit board in the loading frame body is intermittently and automatically fed, the tinning work of the circuit board can be continuously carried out, and the traditional mode that the circuit board is loaded on a single clamp and then the tinning work is carried out in a frequent disassembly and assembly mode is abandoned; therefore, the efficiency of tinning work of batch circuit boards is improved, and the continuity of the tinning work of the circuit boards is ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of circuit board processing, and in particular relates to a circuit board tinning device and a tinning method. Background Art

[0002] Circuit boards are used in products such as computers, mobile phones, personal digital assistants, printers or fax machines. Electrical connections are made with other electronic components through circuit traces on the circuit boards. During this process, the surface of the circuit boards needs to be tinned.

[0003] At present, in the process of tinning circuit boards, in order to ensure that the circuit boards maintain a good posture during tinning, a clamp is usually used to limit the circuit boards. During tinning, the clamp with the circuit boards is slowly pushed into the tin liquid tank through a driving device to achieve the purpose of tinning the circuit boards. After tinning, the clamp is lifted up and multiple circuit boards are removed from the clamp in turn, and the circuit boards are reloaded. This process is complicated and increases the work intensity. For the tinning work of batch circuit boards, its efficiency is greatly reduced, and it is difficult to perform continuous and efficient tinning work on the circuit boards. Summary of the invention

[0004] In order to overcome the above-mentioned defects, the present invention provides a circuit board tinning device and a tinning method, which solves the problem that during tinning, a clamp with a circuit board is slowly pushed into a tin liquid tank by a driving device to achieve the purpose of tinning the circuit board, and after tinning, the clamp is lifted and multiple circuit boards are removed from the clamp in turn, and the circuit boards are reloaded. This process is complicated and increases the work intensity, which greatly reduces the efficiency of tinning work for batch circuit boards.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a circuit board tinning device, comprising a workbench, a support assembly is installed in the middle of the workbench, a plurality of support plates are fixed on the top of the support assembly, a loading frame is provided on the side of the support plate away from the support assembly, a limiting groove is provided on the side of the loading frame away from the support assembly, a pressing assembly is fixedly connected to the top of the loading frame, a pushing assembly is provided above the pressing assembly, and a tin liquid tank is connected to the bottom of the pushing assembly;

[0006] The tin liquid tank is installed on the back of the workbench, and two slides are provided on the side of the loading frame away from the supporting assembly. The two slides are slidably connected with a limiting assembly. The bottom end of the supporting assembly is connected to a driving assembly, and the driving assembly is installed inside the workbench. A solder paste spraying mechanism and an air dryer are respectively provided on both sides of the workbench.

[0007] As a further solution of the present invention: a support leg is fixedly connected to one side of the bottom of the tin liquid box, a discharge valve is installed in the middle of the tin liquid box, and a collection box is installed on the front of the tin liquid box.

[0008] As a further solution of the present invention: the support assembly includes a support shaft, a rotating seat is fixed to the top end of the support shaft, the rotating seat is fixed to the end of the support plate, a bearing seat is provided outside the support shaft, the bearing seat is clamped in the middle of the workbench, and the bottom end of the support shaft passes through the drive assembly and is connected to the bottom of the workbench.

[0009] As a further solution of the present invention: the pressing assembly includes two brackets, the bottom ends of the two brackets are fixed to the top of the loading frame, and the same push plate is fixed between the two brackets. The bracket is U-shaped and a sliding rod is fixed on the inner wall. The sliding rod is arranged through the support plate, and a first spring is connected to the outer sleeve of the sliding rod. The first spring is located between the inner wall of the bracket and the support plate.

[0010] As a further solution of the present invention: the pushing assembly includes a fixing frame, the bottom end of the fixing frame is fixed to the back side of the tin liquid tank, the fixing frame is L-shaped, and two multi-stage electric push rods are fixed to the top of the fixing frame, and the bottom ends of the two multi-stage electric push rods are fixed with the same pressure plate, and the pressure plate is located above the push plate.

[0011] As a further solution of the present invention: the limit assembly includes two limit plates, the limit plates are slidably connected in the slide, a same handle is fixed between the two limit plates, two limit rods are penetrated through the limit plates, the limit rods are fixed in the slide, a second spring is connected to the outer shell of the limit rod, and the second spring is located between the slide and the limit plates.

[0012] As a further solution of the present invention: the driving assembly includes a motor, which is installed at the bottom of the workbench, a turntable and a connecting block are fixed on the output shaft of the motor, a lever is fixed to the end of the connecting block, a driving disk is provided outside the turntable, six arc grooves and six sliding holes are opened outside the driving disk, and the lever is slidably connected in one of the sliding holes.

[0013] A tinning method for a circuit board tinning device, the tinning method comprising the following steps:

[0014] Insert the circuit board to be tinned into the limiting groove in the loading frame, so that the limiting groove can support the circuit board. When the circuit board is completely located in the loading frame, the limiting plate is supported by the elastic force of the plurality of second springs, so that the limiting plate can slide downward on the limiting rod and contact the top of the circuit board, so as to achieve the purpose of elastic compression of the circuit board, and prevent the circuit board from shaking during the transfer and tinning process. The solder paste spraying mechanism is controlled to spray solder paste onto the circuit board in the loading frame, so that a tin layer is formed on the bottom of the circuit board.

[0015] The motor is controlled to drive the turntable and the connecting block to rotate. When the connecting block drives the lever to rotate, the lever can slide into the sliding hole outside the driving disk and drive the driving disk to rotate. Then the driving disk drives the rotating seat to rotate through the supporting shaft. The rotating seat drives the pressing assembly and the loading frame to rotate through multiple supporting plates. The loading frame drives the circuit board to rotate sixty degrees so that the circuit board is directly above the tin liquid tank. At this time, the lever on the connecting block is separated from the sliding hole, and the turntable slides into the arc groove outside the driving disk, which plays a role in limiting the driving disk and the supporting shaft, so that the loading frame will not freely deviate from the position.

[0016] When the tinning work is being performed, the two multi-stage electric push rods are controlled to extend so as to drive the pressing plate to move downward, the pressing plate contacts the push plate and drives the push plate and the two brackets to move downward, and the brackets drive the loading frame and the circuit board to move downward, so that the bottom of the circuit board contacts the tin liquid in the tin liquid tank. After the tinning work is completed, the multi-stage electric push rods are retracted so that the pressing plate can be separated from the push plate, and the bracket is supported by the elastic force of the first spring, so that the bracket drives the loading frame and the circuit board to move upward, so that the circuit board moves to the top of the tin liquid tank;

[0017] Secondly, the connecting block drives the lever to slide into the sliding hole outside the driving disk again and drives the driving disk and the supporting shaft to rotate. Similarly, the supporting plate drives the pressing assembly and the loading frame to rotate, and the loading frame drives the circuit board to rotate sixty degrees, so that the circuit board to be tinned is located above the tin liquid tank, and the circuit board that has been tinned is moved to the top of the air dryer. The air dryer blows to the bottom of the circuit board, which can quickly solidify the tin points. When the circuit board that has been tinned continues to rotate and moves above the collection box, the circuit board can be removed from the loading frame and collected through the collection box.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. In the present invention, the circuit board to be dipped in tin is inserted into the loading frame, and the motor is controlled to drive the rotating disk and the connecting block to rotate. During the process of the connecting block driving the lever to rotate, the lever can slide into the sliding hole outside the driving disk and drive the driving disk to rotate. Then the driving disk drives the rotating seat to rotate through the supporting shaft, and the rotating seat drives the pressing component and the loading frame to rotate through a plurality of supporting plates. The loading frame drives the circuit board to rotate sixty degrees, so that the circuit board is directly above the tin liquid tank. The circuit board in the loading frame is pushed to contact the tin liquid in the tin liquid tank through the pushing component, and the tinning work is completed. Secondly, the connecting block drives the lever to slide into the sliding hole outside the driving disk again and drives the driving disk and the supporting shaft to rotate. Similarly, the supporting plate drives the pressing assembly and the loading frame to rotate, and the loading frame drives the circuit board to rotate sixty degrees, so that the circuit board to be tinned is located above the tin liquid tank. Therefore, the circuit board in the loading frame is automatically fed intermittently, so that the tinning work of the circuit board can be carried out continuously, abandoning the traditional method of frequent disassembly and assembly to load the circuit board on a single fixture for tinning, thereby improving the efficiency of the tinning work of batch circuit boards and ensuring the continuity of the tinning work of the circuit boards.

[0020] 2. In the present invention, the multi-stage electric push rod is controlled to extend so as to drive the pressure plate to move downward, and the pressure plate drives the push plate and the two brackets to move downward, and the bracket drives the loading frame and the circuit board to move downward, so that the bottom of the circuit board contacts the tin liquid in the tin liquid tank, and the position of the circuit board is adjusted by electric control to improve the stability and effect of the circuit board tinning. After the tinning work is completed, the multi-stage electric push rod is retracted so that the pressure plate can be separated from the push plate, and the bracket is supported by the elastic force of the first spring, so that the bracket drives the loading frame and the circuit board to move upward, and the circuit board is moved to the top of the tin liquid tank, so that the circuit board after tinning is conveniently transferred, and the circuit board to be tinned can be smoothly moved to the top of the tin liquid tank, which is beneficial to the continuous tinning work of the circuit board. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a three-dimensional structural schematic diagram of the present invention;

[0022] Figure 2 It is a structural schematic diagram of the cross section of the workbench of the present invention;

[0023] Figure 3 For the present invention Figure 2 The enlarged structural diagram at A in the middle;

[0024] Figure 4 It is a schematic diagram of the structure of the driving assembly of the present invention;

[0025] Figure 5 It is a schematic diagram of the structure of the connection between the loading frame and the pressing assembly of the present invention;

[0026] Figure 6It is a structural schematic diagram of the pressing assembly of the present invention;

[0027] Figure 7 It is a structural schematic diagram of the limiting assembly of the present invention;

[0028] In the figure: 1, workbench; 2, support assembly; 201, support shaft; 202, bearing seat; 203, rotating seat; 3, support plate; 4, loading frame; 5, limit groove; 6, pressing assembly; 601, bracket; 602, push plate; 603, slide bar; 604, first spring; 7, slideway; 8, limit assembly; 801, limit plate; 802, handle; 803, limit rod; 804, second spring ; 9. Pushing assembly; 901. Fixed frame; 902. Multi-stage electric push rod; 903. Pressing plate; 10. Tin liquid tank; 11. Support leg; 12. Discharge valve; 13. Collecting box; 14. Driving assembly; 141. Motor; 142. Turntable; 143. Connecting block; 144. Push rod; 145. Driving disk; 146. Arc groove; 147. Sliding hole; 15. Tin paste spraying mechanism; 16. Air dryer. DETAILED DESCRIPTION

[0029] The technical solution of the present application is further described in detail below in conjunction with specific implementation methods.

[0030] like Figure 1-7 As shown, the present invention provides a technical solution: a circuit board tinning device, comprising a workbench 1, a support assembly 2 is installed in the middle of the workbench 1, a plurality of support plates 3 are fixed on the top of the support assembly 2, the support assembly 2 comprises a support shaft 201, a rotating seat 203 is fixed to the top of the support shaft 201, the rotating seat 203 is fixed to the end of the support plate 3, a bearing seat 202 is provided outside the support shaft 201, the bearing seat 202 is clamped in the middle of the workbench 1, the bottom end of the support shaft 201 passes through the driving assembly 14 and is connected to the bottom of the workbench 1, through the mutual cooperation between the support shaft 201 and the bearing seat 202, the bearing seat 202 can support and limit the support shaft 201, and improve the stability of the support shaft 201 driving the plurality of support plates 3 to rotate through the rotating seat 203;

[0031] A loading frame 4 is provided on the side of the support plate 3 away from the support assembly 2, and a limiting groove 5 is provided on the side of the loading frame 4 away from the support assembly 2. A pressing assembly 6 is fixedly connected to the top of the loading frame 4, and the pressing assembly 6 includes two brackets 601. The bottom ends of the two brackets 601 are fixed to the top of the loading frame 4, and the same push plate 602 is fixed between the two brackets 601. The bracket 601 is U-shaped and a slide bar 603 is fixed on the inner wall. The slide bar 603 is arranged on the support plate 3 through the support plate 3, and a first spring 604 is connected to the outer sleeve of the slide bar 603. The first spring 604 is located between the inner wall of the bracket 601 and the support plate 3. Through the mutual cooperation between the first spring 604, the push plate 602 and the bracket 601, the elastic force of the first spring 604 supports the bracket 601, so that the bracket 601 drives the loading frame 4 and the circuit board to move upward, so as to facilitate the transfer of the circuit board after the tinning is completed;

[0032] A pushing assembly 9 is provided above the pressing assembly 6. The pushing assembly 9 includes a fixing frame 901. The bottom end of the fixing frame 901 is fixed to the back of the tin liquid tank 10. The fixing frame 901 is L-shaped, and two multi-stage electric push rods 902 are fixed to the top of the fixing frame 901. The bottom ends of the two multi-stage electric push rods 902 are fixed with the same pressing plate 903. The pressing plate 903 is located above the pushing plate 602. Because the multi-stage electric push rods 902 are provided, the pressing plate 903 can squeeze the pushing plate 602, so that the pushing plate 602 drives the loading frame 4 and the circuit board to move downward through the bracket 601, thereby improving the stability of the circuit board tinning.

[0033] A tin liquid box 10 is connected to the bottom of the pushing component 9, and the tin liquid box 10 is installed on the back of the workbench 1. A supporting leg 11 is fixedly connected to one side of the bottom of the tin liquid box 10. A discharge valve 12 is installed in the middle of the tin liquid box 10, and a collecting box 13 is installed on the front of the tin liquid box 10. The setting of the discharge valve 12 is convenient for replacing the tin liquid in the tin liquid box 10, and the collecting box 13 can hold the circuit board removed from the loading frame 4.

[0034] Two slideways 7 are provided on one side of the loading frame 4 away from the supporting assembly 2, and a limiting assembly 8 is slidably connected in the two slideways 7. The limiting assembly 8 includes two limiting plates 801, and the limiting plates 801 are slidably connected in the slideways 7. A common handle 802 is fixed between the two limiting plates 801. Two limiting rods 803 are penetrated through the limiting plates 801, and the limiting rods 803 are fixed in the slideways 7. A second spring 804 is connected to the outer sleeve of the limiting rods 803. The second spring 804 is located between the slideway 7 and the limiting plate 801. Through the mutual cooperation between the second spring 804 and the limiting plate 801, the limiting plate 801 is supported by the elastic force of multiple second springs 804, so that the limiting plate 801 can contact with the top of the circuit board, elastically compress the circuit board, and prevent the circuit board from shaking during the transfer and tinning process;

[0035] A driving assembly 14 is connected to the bottom end of the supporting assembly 2, and the driving assembly 14 is installed inside the workbench 1. A solder paste spraying mechanism 15 and an air dryer 16 are respectively provided on both sides of the workbench 1. The driving assembly 14 includes a motor 141, and the motor 141 is installed at the bottom of the workbench 1. A turntable 142 and a connecting block 143 are fixed on the output shaft of the motor 141. A lever 144 is fixed on the end of the connecting block 143. A driving disk 145 is provided outside the turntable 142. Six arc grooves 146 and six sliding holes 147 are opened outside the driving disk 145. The lever 144 is slidably connected in one of the sliding holes 147. Through the mutual cooperation between the lever 144 and the sliding hole 147, when the connecting block 143 drives the lever 144 to rotate, the lever 144 can slide into the sliding hole 147 outside the driving disk 145 and drive the driving disk 145 to rotate sixty degrees, so as to accurately adjust the position of the circuit board and improve the subsequent tinning effect of the circuit board.

[0036] A tinning method for a circuit board tinning device, the tinning method comprising the following steps:

[0037] Insert the circuit board to be tinned into the limiting groove 5 in the loading frame 4, so that the limiting groove 5 can support the circuit board. When the circuit board is completely located in the loading frame 4, the limiting plate 801 is supported by the elastic force of the plurality of second springs 804, so that the limiting plate 801 can slide downward on the limiting rod 803 and contact the top of the circuit board, so as to achieve the purpose of elastic compression of the circuit board, and prevent the circuit board from shaking during the transfer and tinning process. The solder paste spraying mechanism 15 is controlled to spray solder paste onto the circuit board in the loading frame 4, so that a tin layer is formed on the bottom of the circuit board.

[0038] By controlling the motor 141 to work so as to drive the turntable 142 and the connecting block 143 to rotate, during the process of the connecting block 143 driving the lever 144 to rotate, the lever 144 can slide into the sliding hole 147 outside the driving disk 145 and drive the driving disk 145 to rotate, and then the driving disk 145 drives the rotating seat 203 to rotate through the supporting shaft 201, and the rotating seat 203 drives the pressing assembly 6 and the loading frame 4 to rotate through a plurality of supporting plates 3, and the loading frame 4 drives the circuit board to rotate sixty degrees, so that the circuit board is directly above the tin liquid tank 10, at this time, the lever 144 on the connecting block 143 disengages from the sliding hole 147, and the rotating disk 142 slides into the arc groove 146 outside the driving disk 145, which plays a role in limiting the driving disk 145 and the supporting shaft 201, so that the loading frame 4 will not freely deviate from the position;

[0039] When the tinning work is being performed, the two multi-stage electric push rods 902 are controlled to extend so as to drive the pressing plate 903 to move downward, the pressing plate 903 contacts the push plate 602 and drives the push plate 602 and the two brackets 601 to move downward, and the brackets 601 drive the loading frame 4 and the circuit board to move downward, so that the bottom of the circuit board contacts the tin liquid in the tin liquid tank 10. After the tinning work is completed, the multi-stage electric push rods 902 are retracted, so that the pressing plate 903 can be separated from the push plate 602, and the bracket 601 is supported by the elastic force of the first spring 604, so that the bracket 601 drives the loading frame 4 and the circuit board to move upward, so that the circuit board moves to the top of the tin liquid tank 10;

[0040] Secondly, the connecting block 143 drives the lever 144 to slide into the sliding hole 147 outside the driving disk 145 again and drives the driving disk 145 and the support shaft 201 to rotate. Similarly, the support plate 3 drives the pressing assembly 6 and the loading frame 4 to rotate, and the loading frame 4 drives the circuit board to rotate sixty degrees, so that the circuit board to be tinned is located above the tin liquid tank 10, and the circuit board that has been tinned is moved to the top of the air dryer 16, and the air dryer 16 blows to the bottom of the circuit board, which can quickly solidify the tin points. When the circuit board that has been tinned continues to rotate and moves above the collection box 13, the circuit board can be removed from the loading frame 4 and collected through the collection box 13.

[0041] In the description of the present invention, it is necessary to understand that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0042] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0043] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] In the present invention, unless otherwise clearly specified and limited, the first feature "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. In the description of this specification, the description with reference to the terms "one scheme", "some schemes", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the scheme or example are included in at least one scheme or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same scheme or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more schemes or examples in a suitable manner.

Claims

1. A circuit board tinning device, comprising a workbench (1), characterized in that: A support assembly (2) is installed in the middle of the workbench (1), a plurality of support plates (3) are fixed on the top of the support assembly (2), a loading frame (4) is provided on the side of the support plate (3) away from the support assembly (2), a limiting groove (5) is provided on the side of the loading frame (4) away from the support assembly (2), a pressing assembly (6) is fixedly connected to the top of the loading frame (4), a pushing assembly (9) is provided above the pressing assembly (6), and a tin liquid tank (10) is connected to the bottom of the pushing assembly (9); The tin liquid tank (10) is installed on the back of the workbench (1); two slideways (7) are provided on the side of the loading frame (4) away from the supporting assembly (2); a limit assembly (8) is slidably connected inside the two slideways (7); the bottom end of the supporting assembly (2) is connected to a driving assembly (14); the driving assembly (14) is installed inside the workbench (1); and a tin paste spraying mechanism (15) and an air dryer (16) are respectively provided on both sides of the workbench (1).

2. A circuit board tinning device according to claim 1, characterized in that: A support leg (11) is fixedly connected to one side of the bottom of the tin liquid box (10), a discharge valve (12) is installed in the middle of the tin liquid box (10), and a collection box (13) is installed on the front of the tin liquid box (10).

3. A circuit board tinning device according to claim 1, characterized in that: The support assembly (2) comprises a support shaft (201), a rotating seat (203) is fixed to the top end of the support shaft (201), the rotating seat (203) is fixed to the end of the support plate (3), a bearing seat (202) is arranged outside the support shaft (201), the bearing seat (202) is clamped in the middle of the workbench (1), and the bottom end of the support shaft (201) passes through the driving assembly (14) and is connected to the bottom of the workbench (1).

4. A circuit board tinning device according to claim 1, characterized in that: The pressing assembly (6) includes two brackets (601), the bottom ends of the two brackets (601) are fixed to the top of the loading frame (4), and the same push plate (602) is fixed between the two brackets (601). The bracket (601) is U-shaped and a sliding rod (603) is fixed on the inner wall. The sliding rod (603) is arranged on the support plate (3) through the sliding rod (603). The outer sleeve of the sliding rod (603) is connected with a first spring (604), and the first spring (604) is located between the inner wall of the bracket (601) and the support plate (3).

5. A circuit board tinning device according to claim 4, characterized in that: The pushing assembly (9) comprises a fixing frame (901), the bottom end of which is fixed to the back side of the tin liquid box (10), the fixing frame (901) is L-shaped, and two multi-stage electric push rods (902) are fixed to the top of the fixing frame (901), and the bottom ends of the two multi-stage electric push rods (902) are fixed with a same pressing plate (903), and the pressing plate (903) is located above the pushing plate (602).

6. A circuit board tinning device according to claim 1, characterized in that: The limiting assembly (8) comprises two limiting plates (801), the limiting plates (801) are slidably connected in the slideway (7), a common handle (802) is fixed between the two limiting plates (801), two limiting rods (803) are passed through the limiting plates (801), the limiting rods (803) are fixed in the slideway (7), a second spring (804) is connected to the outer shell of the limiting rod (803), and the second spring (804) is located between the slideway (7) and the limiting plates (801).

7. A circuit board tinning device according to claim 1, characterized in that: The driving assembly (14) comprises a motor (141), the motor (141) being mounted at the bottom of the workbench (1), a rotating disk (142) and a connecting block (143) being fixed on the output shaft of the motor (141), a shifting rod (144) being fixed at the end of the connecting block (143), a driving disk (145) being arranged outside the rotating disk (142), six arc grooves (146) and six sliding holes (147) being arranged outside the driving disk (145), and the shifting rod (144) being slidably connected in one of the sliding holes (147).

8. A tinning method for a circuit board tinning device, according to a circuit board tinning device according to any one of claims 1 to 7, characterized in that: The tinning method comprises the following steps: The circuit board to be tinned is inserted into the limiting groove (5) in the loading frame (4), so that the limiting groove (5) can support the circuit board. When the circuit board is completely located in the loading frame (4), the limiting plate (801) is supported by the elastic force of the plurality of second springs (804), so that the limiting plate (801) can slide downward on the limiting rod (803) and contact the top of the circuit board, so as to achieve the purpose of elastic compression of the circuit board and prevent the circuit board from shaking during the transfer and tinning process. The solder paste spraying mechanism (15) is controlled to spray solder paste onto the circuit board in the loading frame (4), so that a tin layer is formed on the bottom of the circuit board; The motor (141) is controlled to drive the rotating disk (142) and the connecting block (143) to rotate. During the process of the connecting block (143) driving the lever (144) to rotate, the lever (144) can slide into the sliding hole (147) outside the driving disk (145) and drive the driving disk (145) to rotate. Then, the driving disk (145) drives the rotating seat (203) to rotate through the supporting shaft (201), and the rotating seat (203) drives the rotating seat (203) to rotate through the plurality of supporting plates (3). The dynamic pressing assembly (6) and the loading frame (4) rotate, and the loading frame (4) drives the circuit board to rotate sixty degrees, so that the circuit board is directly above the tin liquid tank (10). At this time, the lever (144) on the connecting block (143) is separated from the sliding hole (147), and the rotating disk (142) slides into the arc groove (146) outside the driving disk (145), which plays a role in limiting the driving disk (145) and the supporting shaft (201), so that the loading frame (4) will not freely deviate from the position; When the tinning process is being carried out, the two multi-stage electric push rods (902) are controlled to extend so as to drive the pressing plate (903) to move downward, the pressing plate (903) contacts the push plate (602) and drives the push plate (602) and the two brackets (601) to move downward, and the brackets (601) drive the loading frame (4) and the circuit board to move downward, so that the bottom of the circuit board contacts the tin liquid in the tin liquid tank (10). After the tinning process is completed, the multi-stage electric push rods (902) are retracted so that the pressing plate (903) can be separated from the push plate (602), and the bracket (601) is supported by the elastic force of the first spring (604), so that the bracket (601) drives the loading frame (4) and the circuit board to move upward, so that the circuit board moves to the top of the tin liquid tank (10); Secondly, the connecting block (143) drives the lever (144) to slide into the sliding hole (147) outside the driving disk (145) again and drives the driving disk (145) and the support shaft (201) to rotate. Similarly, the support plate (3) drives the pressing assembly (6) and the loading frame (4) to rotate, and the loading frame (4) drives the circuit board to rotate sixty degrees, so that the circuit board to be tinned is located above the tin liquid tank (10). The circuit board that has been tinned is moved to the top of the air dryer (16). The air dryer (16) blows toward the bottom of the circuit board, which can quickly solidify the tin point. When the circuit board that has been tinned continues to rotate and moves to the top of the collection box (13), the circuit board can be removed from the loading frame (4) and collected through the collection box (13).

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