PCB fixing device of SMT chip mounter

Abstract

The invention discloses a PCB fixing device of an SMT chip mounter, which comprises a processing table, a support is fixedly mounted on the top surface of the processing table, a chip mounting mechanism is fixedly mounted on the top surface of the support, a PCB body is arranged on the inner side of the chip mounting mechanism, a control panel and a processing assembly are fixedly mounted on the top surface of the processing table, and the processing assembly is arranged below the chip mounting mechanism. When a PCB body needs to be clamped, the PCB body is placed on the top face of the machining table, the opposite threaded rod is rotated, and due to the fact that the sleeve plates and the interior of the machining table are arranged in a sliding mode, the rotating opposite threaded rod can drive the two sleeve plates to move reversely under the limitation of the sleeve plates, the sleeve plates drive the push plates fixedly installed on the top faces of the sleeve plates to move along with the sleeve plates, and the PCB body is clamped. Due to the fact that the ends of the connecting plates are connected with the moving plates and the push plates in a hinged mode, under the limitation of the connecting plates, the moving push plates pull the moving plates through the connecting plates, the two moving plates move oppositely, the moving plates drive the clamping plates to move along with the moving plates, and the PCB body is clamped through the clamping plates.

Description

Technical Field

[0001] The invention relates to the field of PCB fixing, in particular to a PCB fixing device of an SMT placement machine. Background Art

[0002] SMT placement machines are key equipment used in electronic manufacturing to automatically place surface mount technology components. When SMT placement machines are placing electronic components, they need to accurately fix the PCB (printed circuit board) to ensure the accuracy of the placement. The PCB fixture is an important part of the placement machine, which is responsible for placing the PCB firmly in the appropriate position during the placement process.

[0003] For example, a PCB fixing device for an SMT placement machine disclosed in Chinese patent CN210352017U, the PCB fixing device for the SMT placement machine, a sliding slider, adjusting the distance between four groups of sliders on the slide rail, tightening the threaded rod, fixing the slider on the slide rail, pulling the insertion rod, placing the PCB under the rubber pad, loosening the insertion rod, and the tension spring makes the rubber pad close to the PCB, and different types of PCBs can be fixed on the top plate without screws, reducing the probability of the PCB being damaged by the concentrated stress of the screws; rotating the hollow column to adjust the height of the adjustment column, the inclination of the bottom plate and the top plate with the horizontal plane can be adjusted, not only can the PCB be tilted, but also can keep the top plate and the PCB in a horizontal state when the processing table is tilted, which is convenient for processing the PCB; the downward movement of the movable column drives the compression spring to deform, which can reduce the influence of the vertical impact force on the top plate and the PCB. The PCB fixing device for the SMT placement machine can fix different types of PCBs, can adjust the inclination of the PCB, and reduce the influence of the vertical impact force on the PCB.

[0004] Although this structure can clamp the PCB, it needs to adjust multiple components to clamp the PCB, which makes the operation complicated and inconvenient. Therefore, we propose a PCB fixing device for an SMT placement machine that can quickly clamp and fix the PCB to improve the PCB processing efficiency. Summary of the invention

[0005] The object of the present invention is to provide a PCB fixing device for an SMT placement machine to solve the problems raised in the above background technology.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: a PCB fixing device for an SMT placement machine, comprising a processing table, a bracket fixedly installed on the top surface of the processing table, a placement mechanism fixedly installed on the top surface of the bracket, a PCB body arranged on the inner side of the placement mechanism, a control panel fixedly installed on the top surface of the processing table, and a processing component arranged below the placement mechanism, the processing component comprising a clamping component arranged below the placement mechanism, an adsorption component arranged on the inner side of the clamping component, and a cleaning component arranged above the adsorption component.

[0007] According to the above technical scheme, the clamping assembly includes opposing threaded rods rotatably connected to the inside of the processing table, the outer wall of the opposing threaded rods is sleeved with a sleeve plate, the top surface of the sleeve plate is fixedly installed with a push plate, the outer wall of the push plate is hingedly connected with a connecting plate, and the connecting plate is hingedly connected with a movable plate at one end away from the push plate, the outer wall of the movable plate is fixedly installed with a first magnetic ring, the movable plate is slidably provided with a sliding rod, the end of the sliding rod is fixedly installed with a second magnetic ring, the outer wall of the second magnetic ring is fixedly installed with a clamping plate, the bottom of the movable plate is fixedly installed with a limiting plate, the outer wall of the movable plate is fixedly installed with a fixed plate, the outer wall of the fixed plate is fixedly installed with a limiting rod, the outer wall of the limit rod is sleeved with a spring, the outer wall of the limit rod is slidably provided with a pressure plate, and the pressure plate is slidably provided with a bayonet.

[0008] According to the above technical solution, the adsorption assembly includes a push rod fixedly installed on the outer wall of the sleeve plate, a sealing ring is fixedly installed on the end of the push rod away from the sleeve plate, a sleeve is slidably provided on the outer wall of the sealing ring, a suction groove is opened on the top surface of the processing table, a bottom plate is fixedly installed on the inner wall of the suction groove, and an adsorption plate is provided above the bottom plate.

[0009] According to the above technical solution, the cleaning assembly includes a support plate fixedly installed on the top surface of the push plate, the end of the support plate is rotatably connected to a rotating column, the end of the rotating column is fixedly installed with a rotating roller, and the outer wall of the rotating roller is fixedly installed with an adsorption brush.

[0010] According to the above technical solution, the side of the clamping plate away from the sliding rod is made of rubber material. There are twelve clamping plates, which are divided into two groups and symmetrically distributed about the center line of the top surface of the processing table. Under the restriction of the clamping plates made of rubber material, the PCB body can be prevented from being clamped and damaged.

[0011] According to the above technical solution, the outer wall of the pressing plate is toothed, and the sliding rod is arranged in contact with the pressing plate. Under the pressure of the pressing plate, the sliding rod can be prevented from sliding, so as to ensure that the PCB body patch is more accurate.

[0012] According to the above technical solution, the end of the connecting plate is hingedly connected to the push plate and the movable plate, and the first magnetic ring and the second magnetic ring magnetically repel each other. When the push plate moves, the movable plate can be pushed by the connecting plate. Under the magnetic repulsion, the first magnetic ring fixedly installed on the outer wall of the movable plate pushes the second magnetic ring, so that the clamping plate fits and clamps according to the shape of the PCB body.

[0013] According to the above technical solution, holes are opened equidistantly inside the adsorption plate. There are two adsorption plates, which are symmetrically distributed about the center line of the top surface of the processing table. Under the adsorption restriction of the adsorption plate, the PCB body can be adsorbed and clamped, making the clamping of the PCB body more stable.

[0014] According to the above technical solution, the sealing ring slides in a sealed manner inside the sleeve, the end of the sleeve is fixedly installed inside the bottom plate, and the sleeve and the bottom plate are connected. Under the restriction of the sealed sliding between the sealing ring and the sleeve, the sealing ring can draw the gas inside the sleeve to adsorb and clamp the bottom of the PCB body.

[0015] According to the above technical solution, the adsorption brush is made of adhesive material, there are two support plates, which are symmetrically distributed about the center line of the top surface of the processing table. Under the limitation of the adsorption brush made of adhesive material, the unprocessed PCB body can be cleaned to improve the patch effect.

[0016] Compared with the prior art, the beneficial effects achieved by the present invention are: 1. The PCB fixing device of the SMT placement machine of the present invention is composed of a clamping assembly as one component. When the PCB body needs to be clamped, the PCB body is placed on the top surface of the processing table, and the opposing threaded rods are rotated. Since the sleeve plate is slidably arranged inside the processing table, under the restriction thereof, the rotating opposing threaded rods can drive the two sleeve plates to move in the opposite direction, so that the sleeve plate drives the push plate fixedly installed on the top surface thereof to move accordingly. Since the end of the connecting plate is hingedly connected to the moving plate and the push plate, under the restriction thereof, the moving push plate pulls the moving plate through the connecting plate, so that the two moving plates move in opposite directions, so that the moving plate drives the clamping plate to move accordingly, and the PCB body is clamped by the clamping plate. This structure only requires the PCB body to be placed on the top surface of the processing table and the opposing threaded rods to be rotated, so that the PCB body can be clamped.

[0017] 2. The PCB fixing device of the SMT placement machine of the present invention is composed of a clamping assembly as one of its components. When the outer shape of the PCB body is irregular, it needs to be clamped. At this time, the latch is pulled out so that it is no longer sleeved with the inside of the moving plate. The pressure plate is pulled to slide on the outer wall of the limit rod, and the spring sleeved on the outer wall of the limit rod is compressed. At this time, the latch set in the sliding inside of the pressure plate is pushed toward the moving plate. At this time, the opposite threaded rod is continued to be rotated so that the push plate pushes the moving plate through the connecting plate, so that the moving plate drives the sliding rod set inside it to move toward the PCB body. Since the first magnetic ring and the second magnetic ring magnetically repel each other, under their restriction, the first magnetic ring can be The second magnetic ring pushes the clamping plate to contact the outer wall of the PCB body. As the movable plate moves, a clamping force is applied to the outer wall of the PCB body. Since each sliding rod slides independently, under its limitation, the clamping plate can be clamped according to the shape of the PCB body. When the clamping is completed, the latch pin is pulled so that the latch pin is no longer placed on the top surface of the movable plate. Under the elastic action of the spring, the pressure plate is pushed downward to contact and press the outer wall of the sliding rod. The latch pin is inserted into the pressure plate and the movable plate. After the pressure plate presses the sliding rod, the PCB body patch can be made more accurate. This structure can press the independently sliding sliding rod to clamp PCB bodies of different shapes.

[0018] 3. The PCB fixing device of the SMT placement machine of the present invention is composed of an adsorption component as one of its components. When the PCB body needs to be clamped, the opposing threaded rods are rotated to move the sleeve plate in the opposite direction, so that the sleeve plate drives the push rod fixedly installed on its outer wall to move accordingly, and the push rod drives the sealing ring to move accordingly, so that the sealing ring slides inside the sleeve. Since the sealing ring slides with the inside of the sleeve in a sealed manner, under its restriction, the sealing ring can draw the gas inside the sleeve, draw the gas inside the suction groove, and make the adsorption plate draw air toward the bottom of the PCB body, so that the PCB body can be more stably installed on the top surface of the processing table. When the sleeve plates move in opposite directions, the push rod drives the sealing ring to slide inside the sleeve, pushes the gas inside the sleeve, blows the PCB body through the suction groove and the adsorption plate, and lifts up the PCB body, so as to facilitate the removal of the PCB body.

[0019] 4. The PCB fixing device of the SMT placement machine of the present invention is composed of a cleaning component as one of its components. When the PCB body needs to be clamped, the PCB body is placed under the adsorption brush, and the opposite threaded rods are rotated to make the two sleeve plates drive the push plates to move in the opposite direction, so that the push plates drive the support plates to move accordingly, and the support plates drive the rotating column, the rotating roller and the adsorption brush to move, so that the adsorption brush slides against the top surface of the PCB body to clean the dust adhering to the top surface of the PCB body, so as to improve its placement effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings: Figure 1 It is a three-dimensional front structural schematic diagram of a PCB fixing device of an SMT placement machine of the present invention; Figure 2 A schematic diagram of a three-dimensional clamping component, an adsorption component and a cleaning component of a PCB fixing device of an SMT placement machine of the present invention; Figure 3 A schematic diagram of a clamping assembly of a PCB fixing device of an SMT placement machine of the present invention; Figure 4 It is a partial cross-sectional schematic diagram of a clamping component of a PCB fixing device of an SMT placement machine of the present invention; Figure 5 It is a partial exploded schematic diagram of a clamping assembly of a PCB fixing device of an SMT placement machine of the present invention; Figure 6 A schematic diagram of an adsorption component of a PCB fixing device of an SMT placement machine of the present invention; Figure 7 It is an exploded schematic diagram of an adsorption component of a PCB fixing device of an SMT placement machine of the present invention; Figure 8 A schematic diagram of a cleaning component of a PCB fixing device of an SMT placement machine according to the present invention; Fig. 9 It is an exploded schematic diagram of a cleaning component of a PCB fixing device of an SMT placement machine of the present invention; In the figure: 1. processing table; 2. bracket; 3. patch mechanism; 4. processing component; 41. clamping component; 43. adsorption component; 44. cleaning component; 5. control panel; 6. PCB body; 411. opposite threaded rod; 412. sleeve plate; 413. push plate; 414. connecting plate; 415. moving plate; 416. first magnetic ring; 417. sliding rod; 418. second magnetic ring; 419. clamping plate; 420. limit plate; 421. fixed plate; 422. limit rod; 423. spring; 424. pressure plate; 425. latch; 431. push rod; 432. sealing ring; 433. sleeve; 434. suction groove; 435. bottom plate; 436. adsorption plate; 441. support plate; 442. rotating column; 443. rotating roller; 444. adsorption brush. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] Embodiment 1: A preferred embodiment of a PCB fixing device for an SMT placement machine provided by the present invention is as follows Figures 1 to 9 Shown: A PCB fixing device for an SMT placement machine, comprising a processing table 1; A bracket 2 is fixedly mounted on the top surface of the processing table 1; A patch mechanism 3 is fixedly mounted on the top surface of the bracket 2; A PCB body 6 is arranged inside the patch mechanism 3; A control panel 5 is fixedly mounted on the top surface of the processing table 1; and a processing assembly 4 arranged below the patch mechanism 3, the processing assembly 4 includes a clamping assembly 41 arranged below the patch mechanism 3, the clamping assembly 41 includes a pair of threaded rods 411 rotatably connected to the inside of the processing table 1, the outer wall of the pair of threaded rods 411 is sleeved with a sleeve plate 412, the top surface of the sleeve plate 412 is fixedly installed with a push plate 413, the outer wall of the push plate 413 is hingedly connected with a connecting plate 414, the connecting plate 414 is hingedly connected with a moving plate 415 at one end away from the push plate 413, and the outer wall of the moving plate 415 is fixedly installed with a first magnetic ring 416 A sliding rod 417 is slidably provided inside the movable plate 415, a second magnetic ring 418 is fixedly installed on the end of the sliding rod 417, a clamping plate 419 is fixedly installed on the outer wall of the second magnetic ring 418, a limiting plate 420 is fixedly installed on the bottom of the movable plate 415, a fixed plate 421 is fixedly installed on the outer wall of the movable plate 415, a limiting rod 422 is fixedly installed on the outer wall of the fixed plate 421, a spring 423 is sleeved on the outer wall of the limiting rod 422, a pressing plate 424 is slidably provided on the outer wall of the limiting rod 422, and a latch 425 is slidably provided inside the pressing plate 424.

[0023] In this embodiment, when it is necessary to clamp the PCB body 6, the PCB body 6 is placed on the top surface of the processing table 1, and the opposing threaded rods 411 are rotated. Since the sleeve plate 412 is slidably arranged inside the processing table 1, under its restriction, the rotating opposing threaded rods 411 can drive the two sleeve plates 412 to move in the opposite direction, so that the sleeve plate 412 drives the push plate 413 fixedly installed on its top surface to move accordingly. Since the end of the connecting plate 414 is hingedly connected to the moving plate 415 and the push plate 413, under its restriction, the moving push plate 413 pulls the moving plate 415 through the connecting plate 414, so that the two moving plates 415 move in opposite directions, so that the moving plates 415 drives the clamping plate 419 to move accordingly, and the PCB body 6 is clamped by the clamping plate 419. This structure only needs to place the PCB body 6 on the top surface of the processing table 1 and rotate the opposite threaded rod 411 to clamp the PCB body 6. When the shape of the PCB body 6 is irregular, it needs to be clamped. At this time, the bayonet 425 is pulled out so that it is no longer sleeved with the inside of the moving plate 415, and the pressure plate 424 is pulled to make the pressure plate 424 slide on the outer wall of the limit rod 422, and the spring 423 sleeved on the outer wall of the limit rod 422 is compressed. At this time, the bayonet 425 set inside the pressure plate 424 is slidable. 5 is pushed in the direction of the movable plate 415. At this time, the opposite threaded rod 411 continues to rotate, so that the push plate 413 pushes the movable plate 415 through the connecting plate 414, so that the movable plate 415 drives the sliding rod 417 slidably arranged inside it to move in the direction of the PCB body 6. Since the first magnetic ring 416 and the second magnetic ring 418 magnetically repel each other, under their restriction, the first magnetic ring 416 can push the second magnetic ring 418, so that the second magnetic ring 418 drives the clamping plate 419 to contact the outer wall of the PCB body 6. As the movable plate 415 moves, a clamping force is applied to the outer wall of the PCB body 6. Since each sliding rod 417 is independent The movable plate 415 is provided with a plurality of movable plates 416, and the movable plates 417 are provided with a plurality of movable plates 418. The movable plates 416 are provided with a plurality of movable plates 419, and the movable plates 418 are provided with a plurality of movable plates 419. The movable plates 416 are provided with a plurality of movable plates 418. The movable plates 416 are provided with a plurality of movable plates 419, and the movable plates 418 are provided with a plurality of movable plates 419.

[0024] Embodiment 2: A preferred embodiment of a PCB fixing device for an SMT placement machine provided by the present invention is as follows Figures 1 to 9As shown: the adsorption assembly 43 includes a push rod 431 fixedly mounted on the outer wall of the sleeve plate 412, a sealing ring 432 is fixedly mounted on one end of the push rod 431 away from the sleeve plate 412, a sleeve 433 is slidably arranged on the outer wall of the sealing ring 432, a suction groove 434 is opened on the top surface of the processing table 1, a bottom plate 435 is fixedly mounted on the inner wall of the suction groove 434, and an adsorption plate 436 is arranged above the bottom plate 435.

[0025] In this embodiment, when it is necessary to clamp the PCB body 6, the opposing threaded rods 411 are rotated to move the sleeve plate 412 in the opposite direction, so that the sleeve plate 412 drives the push rod 431 fixedly installed on its outer wall to move accordingly, and the push rod 431 drives the sealing ring 432 to move accordingly, so that the sealing ring 432 slides inside the sleeve 433. Since the sealing ring 432 slides in a sealed manner with the inside of the sleeve 433, under its restriction, the sealing ring 432 can pump the gas inside the sleeve 433, pump the gas inside the suction groove 434, and cause the adsorption plate 436 to draw air toward the bottom of the PCB body 6, so that the PCB body 6 is more stably installed on the top surface of the processing table 1. When the sleeve plate 412 moves in opposite directions, the push rod 431 drives the sealing ring 432 to slide inside the sleeve 433, pushes the gas inside the sleeve 433, blows the PCB body 6 through the suction groove 434 and the adsorption plate 436, and lifts up the PCB body 6 to facilitate the removal of the PCB body 6.

[0026] Embodiment 3: A preferred embodiment of a PCB fixing device for an SMT placement machine provided by the present invention is as follows Figures 1 to 9 As shown: the cleaning assembly 44 includes a support plate 441 fixedly mounted on the top surface of the push plate 413, the end of the support plate 441 is rotatably connected to a rotating column 442, the end of the rotating column 442 is fixedly mounted with a rotating roller 443, and the outer wall of the rotating roller 443 is fixedly mounted with an adsorption brush 444.

[0027] In this embodiment, when the PCB body 6 needs to be clamped, the PCB body 6 is placed under the adsorption brush 444, and the opposing threaded rods 411 are rotated so that the two sleeve plates 412 drive the push plates 413 to move in the opposite direction, and the push plates 413 drive the support plates 441 to move accordingly, and the support plates 441 drive the rotating columns 442, the rotating rollers 443 and the adsorption brush 444 to move, so that the adsorption brush 444 slides against the top surface of the PCB body 6 to clean the dust adhering to the top surface of the PCB body 6, thereby improving its patch effect.

[0028] Among them, the side of the clamping plate 419 away from the sliding rod 417 is made of rubber material. There are twelve clamping plates 419, which are divided into two groups and are symmetrically distributed with respect to the center line of the top surface of the processing table 1. Under the restriction of the clamping plate 419 made of rubber material, the PCB body 6 can be prevented from being clamped and damaged.

[0029] Among them, the outer wall of the pressing plate 424 is toothed, and the slide bar 417 is arranged in contact with the pressing plate 424. Under the pressure of the pressing plate 424, the slide bar 417 can not slide, so as to ensure that the PCB body 6 is patched more accurately.

[0030] Among them, the end of the connecting plate 414 is hingedly connected to the push plate 413 and the movable plate 415, and the first magnetic ring 416 and the second magnetic ring 418 magnetically repel each other. When the push plate 413 moves, the movable plate 415 can be pushed by the connecting plate 414. Under the magnetic repulsion, the first magnetic ring 416 fixedly installed on the outer wall of the movable plate 415 pushes the second magnetic ring 418, so that the clamping plate 419 fits and clamps according to the shape of the PCB body 6.

[0031] Among them, holes are equidistantly opened inside the adsorption plate 436, and there are two adsorption plates 436, which are symmetrically distributed with respect to the center line of the top surface of the processing table 1. Under the adsorption restriction of the adsorption plate 436, the PCB body 6 can be adsorbed and clamped, making the clamping of the PCB body 6 more stable.

[0032] Among them, the sealing ring 432 and the sleeve 433 are sealed and slid inside, the end of the sleeve 433 is fixedly installed inside the bottom plate 435, and the sleeve 433 and the bottom plate 435 are connected. Under the sealing sliding restriction of the sealing ring 432 and the sleeve 433, the sealing ring 432 can draw the gas inside the sleeve 433 to adsorb and clamp the bottom of the PCB body 6.

[0033] Among them, the adsorption brush 444 is made of adhesive material, and there are two support plates 441, which are symmetrically distributed with respect to the center line of the top surface of the processing table 1. Under the restriction of the adsorption brush 444 made of adhesive material, the unprocessed PCB body 6 can be cleaned to improve the patch effect.

[0034] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0035] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A PCB fixing device for an SMT placement machine, comprising a processing table (1); A bracket (2) is fixedly mounted on the top surface of the processing table (1); A patch mechanism (3) is fixedly mounted on the top surface of the bracket (2); A PCB body (6) is arranged inside the patch mechanism (3); A control panel (5) is fixedly mounted on the top surface of the processing table (1); and a processing component (4) arranged below the patch mechanism (3), characterized in that: The processing component (4) comprises a clamping component (41) arranged below the patch mechanism (3), an adsorption component (43) is arranged inside the clamping component (41), and a cleaning component (44) is arranged above the adsorption component (43).

2. The PCB fixing device of a SMT placement machine according to claim 1, characterized in that: The clamping assembly (41) comprises opposing threaded rods (411) rotatably connected to the inside of the processing table (1); the outer wall of the opposing threaded rods (411) is sleeved with a sleeve plate (412); the top surface of the sleeve plate (412) is fixedly mounted with a push plate (413); the outer wall of the push plate (413) is hingedly connected to a connecting plate (414); the connecting plate (414) is hingedly connected to a movable plate (415) at one end away from the push plate (413); the outer wall of the movable plate (415) is fixedly mounted with a first magnetic ring (416); a sliding rod (417) is slidably arranged inside the movable plate (415); the sliding rod (417) is slidably mounted inside the movable plate (415); the sliding rod (417) is hingedly mounted on the outer wall of the movable plate (415); the sliding rod (417) is hingedly mounted on the inner ... outer wall of the movable plate (415); the sliding rod ( A second magnetic ring (418) is fixedly mounted on the end of the rod (417); a clamping plate (419) is fixedly mounted on the outer wall of the second magnetic ring (418); a limiting plate (420) is fixedly mounted on the bottom of the movable plate (415); a fixed plate (421) is fixedly mounted on the outer wall of the movable plate (415); a limiting rod (422) is fixedly mounted on the outer wall of the fixed plate (421); a spring (423) is sleeved on the outer wall of the limiting rod (422); a pressing plate (424) is slidably mounted on the outer wall of the limiting rod (422); a latch (425) is slidably mounted inside the pressing plate (424).

3. The PCB fixing device of a SMT placement machine according to claim 1, characterized in that: The adsorption assembly (43) comprises a push rod (431) fixedly mounted on the outer wall of the sleeve plate (412); a sealing ring (432) is fixedly mounted on one end of the push rod (431) away from the sleeve plate (412); a sleeve (433) is slidably mounted on the outer wall of the sealing ring (432); a suction groove (434) is formed on the top surface of the processing table (1); a bottom plate (435) is fixedly mounted on the inner wall of the suction groove (434); and an adsorption plate (436) is arranged above the bottom plate (435).

4. The PCB fixing device of a SMT placement machine according to claim 1, characterized in that: The cleaning assembly (44) comprises a support plate (441) fixedly mounted on the top surface of the push plate (413); the end of the support plate (441) is rotatably connected to a rotating column (442); the end of the rotating column (442) is fixedly mounted with a rotating roller (443); and the outer wall of the rotating roller (443) is fixedly mounted with an adsorption brush (444).

5. The PCB fixing device of a SMT placement machine according to claim 2, characterized in that: The side of the clamping plate (419) away from the slide rod (417) is made of rubber. There are twelve clamping plates (419) divided into two groups and symmetrically distributed about the center line of the top surface of the processing table (1).

6. The PCB fixing device of a SMT placement machine according to claim 2, characterized in that: The outer wall of the pressing plate (424) is tooth-shaped, and the sliding rod (417) is arranged in contact with the pressing plate (424).

7. The PCB fixing device of a SMT placement machine according to claim 2, characterized in that: The end of the connecting plate (414) is hingedly connected to the push plate (413) and the moving plate (415), and the first magnetic ring (416) and the second magnetic ring (418) magnetically repel each other.

8. The PCB fixing device of a SMT placement machine according to claim 3, characterized in that: The adsorption plate (436) has holes formed therein at equal intervals. There are two adsorption plates (436) which are symmetrically distributed about the center line of the top surface of the processing table (1).

9. The PCB fixing device of a SMT placement machine according to claim 3, characterized in that: The sealing ring (432) slides in a sealed manner inside the sleeve (433), the end of the sleeve (433) is fixedly installed inside the bottom plate (435), and the sleeve (433) and the bottom plate (435) are connected.

10. The PCB fixing device of a SMT placement machine according to claim 4, characterized in that: The adsorption brush (444) is made of an adhesive material, and there are two support plates (441), which are symmetrically distributed about the center line of the top surface of the processing table (1).

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