Laminating table for laminating circuit boards

Abstract

The utility model provides a board stacking table for circuit board stacking, and belongs to the technical field of board stacking tables. The plate stacking table comprises an operation table, a cover plate, a connecting assembly, a rotating arm and a power assembly. The operation table is provided with an operation face, the connecting assembly is used for connecting the cover plate, the rotating arm is connected between the connecting assembly and the power assembly, and the power assembly is used for driving the rotating arm to rotate so that the cover plate connected with the connecting assembly can rotate relative to the operation face. The power assembly comprises a driving motor, a connecting rod, two rotating shafts arranged in parallel and two rocker arms arranged in parallel, the rocker arms correspond to the rotating shafts one to one, the rocker arms are in key connection with the corresponding rotating shafts, the connecting rod is rotationally connected between the two rocker arms, one rotating shaft is in key connection with the rotating arm, and the other rotating shaft is in key connection with the driving motor; the driving motor is used for driving the corresponding rotating shaft to rotate and driving the other rotating shaft to drive the rotating arm to rotate through the connecting rod. The power assembly can bear large driving force, and it is guaranteed that the rotating arm rotates smoothly.

Description

Technical Field

[0001] The utility model belongs to the technical field of plate stacking platforms, and in particular relates to a plate stacking platform for stacking circuit boards. Background Art

[0002] During the manufacturing process of multi-layer circuit boards, most of them need to go through a lamination process, which is used to heat-press the core layer and each layer of copper foil into one to form a multi-layer circuit board. In addition, during the manufacturing process of the circuit board, it also involves the stacking and lamination of multiple layers of the same substrate, so that the stacked and pressed substrates of the same type can be processed at one time, reducing the process of processing each substrate at a time and improving production efficiency.

[0003] In the prior art, a stacking station is required to stack and press multi-layer circuit boards and to stack and press the same substrates: the materials are stacked on the operating surface of the stacking station and the materials are pressed using a cover plate. However, during the operation of the stacking station, the driving structure connected to the cover plate is not smooth, which affects the movement of the cover plate position and thus affects the operation of the stacking station. Utility Model Content

[0004] The purpose of the present application is to provide a stacking table for circuit board stacking to solve the above-mentioned technical problems existing in the prior art.

[0005] This application is implemented as follows:

[0006] The embodiment of the present application provides a stacking table for circuit board stacking, including an operating table, a cover plate, a connecting assembly, a rotating arm and a power assembly; the operating table has an operating surface, the connecting assembly is used to connect the cover plate, the rotating arm is connected between the connecting assembly and the power assembly, and the power assembly is used to drive the rotating arm to rotate so that the cover plate connected to the connecting assembly rotates relative to the operating surface; the power assembly includes a driving motor, a connecting rod, two parallel rotating shafts and two parallel rocker arms, the rocker arms and the rotating shafts are arranged in a one-to-one correspondence, the rocker arms are keyed to the corresponding rotating shafts, the connecting rod is rotatably connected between the two rocker arms, one of the rotating shafts is keyed to the rotating arm, and the other rotating shaft is keyed to the driving motor, the driving motor is used to drive its corresponding rotating shaft to rotate, and drive the other rotating shaft to rotate the rotating arm through the connecting rod.

[0007] The technical solution provided by this application can achieve the following beneficial effects:

[0008] In the present application, a rotating shaft is set to be connected to the driving motor and one of the rocker keys, another rotating shaft is set to be connected to the rotating arm and the other rocker key, and a connecting rod is set to be connected between the two parallel rocker arms, so that during the operation of the driving motor, the driving motor can drive the corresponding rocker arm to rotate, and drive the other rocker arm to rotate through the connecting rod, and the other rocker arm drives the rotating arm to rotate through the corresponding rotating shaft, so that the cover plate connected to the rotating arm can rotate relative to the operating surface to process the material on the operating surface; the structural strength of the rocker arm and the connecting rod is high and can withstand a large driving force, so as to ensure that during use, the cooperation between the rocker arm and the connecting rod is not prone to jamming, which is beneficial to the normal rotation of the rotating arm and ensures the smooth rotation of the rotating arm. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments of the utility model or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0010] Figure 1 This is a schematic diagram of the overall structure of the stacking platform provided in some embodiments of the present application. Figure 1 ;

[0011] Figure 2 This application is about Figure 1 Detailed view of point A;

[0012] Figure 3 This is a schematic diagram of the overall structure of the stacking platform provided in some embodiments of the present application. Figure 2 ;

[0013] Figure 4 This application is about Figure 3 Detail of point B;

[0014] Figure 5 is a schematic diagram of the overall structure of a power assembly provided in some embodiments of the present application;

[0015] Figure 6 is a schematic diagram of the overall structure of a connecting rod provided in some embodiments of the present application;

[0016] Figure 7 is a schematic diagram of the overall structure of a rocker arm provided in some embodiments of the present application;

[0017] Figure 8 is a schematic diagram of the overall structure of the limiter provided in some embodiments of the present application;

[0018] Fig. 9It is a schematic diagram of the matching structure of the limit member and the rotating shaft provided in some embodiments of the present application.

[0019] In the figure: 100-operating table, 110-operating surface, 200-cover plate, 300-connecting assembly, 400-rotating arm, 500-power assembly, 510-driving motor, 520-connecting rod, 521-connecting sub-section, 522-middle section, 523-locking piece, 524-thread groove, 525-threaded portion, 530-rotating shaft, 540-rocker arm, 541-installing channel, 542-tightening channel, 543-connecting protrusion, 544-connecting shaft, 545-reinforcement rib, 550-identification piece, 560-sensor, 570-limiting piece, 571-limiting ring, 572-limiting piece, 600-safety clamp, 700-cylinder. DETAILED DESCRIPTION

[0020] The following description provides many different embodiments or examples for implementing different features of the present invention. The components and arrangements described in the following specific examples are only used to simplify the present invention and are only used as examples, not to limit the present invention.

[0021] In the related art, the power assembly of the stacking platform for driving the rotating arm to rotate generally selects a gear transmission structure or a belt transmission structure. However, during use, the power assembly may get stuck when driving the rotating arm to rotate.

[0022] The inventors have found that the reason why the rotating arm does not rotate smoothly is because the cover plate is too heavy. As the cover plate is too heavy, the overall weight of the rotating arm connected to the cover plate is too heavy, the resistance encountered by the power assembly in the process of driving the rotating arm to rotate is too large, the gear teeth in the gear transmission structure are prone to breakage, and the belt in the belt transmission structure is prone to slippage, thus affecting the smoothness of the rotating arm's rotation.

[0023] In view of this, the present application embodiment provides a circuit board stacking table, referring to Figures 1 to 9 As shown, the problem of the rotating arm 400 not rotating smoothly is solved.

[0024] refer to Figure 1 and Figure 3 As shown, the plate stacking platform provided in the embodiment of the present application includes an operating platform 100 , a cover plate 200 , a connecting assembly 300 , a rotating arm 400 and a power assembly 500 .

[0025] The operating table 100 has an operating surface 110. During the process of laminating the material, the material is placed on the operating surface 110. The rotating arm 400 is connected between the connecting assembly 300 and the power assembly 500. The connecting assembly 300 is used to connect the cover plate 200 so that the cover plate 200 can move synchronously with the rotating arm 400. The connecting assembly 300 generally selects a magnetic connection structure to facilitate the control of the connection or removal with the cover plate 200. The power assembly 500 is used to drive the rotating arm 400 to rotate. During the rotation of the rotating arm 400, the connecting assembly 300 and the cover plate 200 connected to the rotating arm 400 also rotate together, so that the cover plate 200 connected to the connecting assembly 300 rotates relative to the operating surface 110. When the cover plate 200 rotates to be parallel to the operating surface 110, the cover plate 200 can be controlled to descend and placed on the surface of the material, and the connecting assembly 300 is controlled to release the connection with the cover plate 200, and then the material placed on the operating surface 110 can be pressed.

[0026] The power assembly 500 provided in the embodiment of the present application includes a driving motor 510, a connecting rod 520, two parallel rotating shafts 530 and two parallel rocker arms 540. Figure 5 As shown. Among them, the rotating shaft 530 and the rocker arm 540 are arranged in a one-to-one correspondence, the rotating shaft 530 is key-connected with the corresponding rocker arm 540, and the rotating shaft 530 can rotate synchronously with the rocker arm 540. The connecting rod 520 is rotatably connected between the two rocker arms 540, and when one of the rocker arms 540 rotates, the other rocker arm 540 can be driven to rotate through the connecting rod 520. The two rocker arms 540 are arranged in parallel to ensure that the rotation of the two rocker arms 540 can be synchronized under the connection of the connecting rod 520. One of the rotating shafts 530 is key-connected with the output shaft of the driving motor 510, and the driving motor 510 drives the rotating shaft 530 to rotate. The other rotating shaft 530 is connected to the rotating arm 400, and when the rotating shaft 530 rotates, the rotating shaft 530 can drive the rotating arm 400 to rotate.

[0027] The driving motor 510 is used as the power source of the power assembly 500. After the driving motor 510 is started, it first drives the rotating shaft 530 connected to the key to rotate, and the rotating shaft 530 drives the rocker arm 540 connected to it to rotate. After the rocker arm 540 rotates, it drives another rocker arm 540 to rotate through the connecting rod 520. The other rocker arm 540 drives the rotating shaft 530 connected to it to rotate, and the rotating shaft 530 is connected to the rotating arm 400, driving the rotating arm 400 to rotate, thereby changing the position of the cover plate 200.

[0028] In the present application, the connecting rod 520 and the rocker arm 540 are used to drive the rotating arm 400 to rotate. Since the structure of the connecting rod 520 and the rocker arm 540 is stronger than that of the gear transmission structure and the belt transmission structure, it can withstand a greater force in the process of driving the rotating arm 400 to rotate, and is less likely to be damaged or broken, and the rotation process of the rotating arm 400 is smoother. In addition, the processing accuracy requirements of the connecting rod 520 and the rocker arm 540 are not high, and the assembly requirements are not high, which is conducive to improving the processing efficiency of the overall setting, improving the assembly efficiency, and the disassembly and installation efficiency of the power component 500 is also high during the inspection and maintenance process, which is convenient for inspection and maintenance.

[0029] In some preferred embodiments, reference Figure 6 As shown, the connecting rod 520 includes two connecting sub-segments 521 and a middle segment 522. The two connecting sub-segments 521 are respectively located at the axial ends of the middle segment 522 and are both threadedly connected to the middle segment 522. The two connecting sub-segments 521 correspond to the rocker arms 540 one by one and are both rotatably connected to the corresponding rocker arms 540. The connecting sub-segments 521 and the middle segment 522 are threadedly connected, so that the length of the threaded connection between the connecting sub-segments 521 and the middle segment 522 can be adjusted to adjust the overall length of the connecting rod 520 to adapt to the distance between the two rocker arms 540, so as to ensure that the connecting rod 520 can smoothly transmit the driving force between the two rocker arms 540.

[0030] In the connection structure of the connecting subsection 521 and the middle section 522, one of the connecting subsection 521 and the middle section 522 is provided with a thread groove 524, and the other is provided with a threaded portion 525, and the threaded portion 525 is installed in the corresponding thread groove 524. In addition, the connecting rod 520 also includes a locking member 523, and the locking member 523 is threadedly connected to the outside of the threaded portion 525. During the assembly process, the locking member 523 is rotated to adjust the position of the locking member 523 on the threaded portion 525, so that the locking member 523 is tightly pressed against the component provided with the thread groove 524, thereby improving the connection stability between the threaded portion 525 and the thread groove 524. In actual implementation, the locking member 523 is generally selected to use a nut.

[0031] The rocker arm 540 is provided with a mounting channel 541 inside, and the mounting channel 541 is used to mount the rotating shaft 530. The rotating shaft 530 is inserted into the mounting channel 541. In addition, the inner wall of the mounting channel 541 is also provided with a keyway for accommodating a connection key. A connection key is installed in the keyway so that the rocker arm 540 and the rotating shaft 530 are key-connected. The rocker arm 540 is also provided with a tightening channel 542. One end of the tightening channel 542 passes through the surface of the rocker arm 540, and the other end is connected to the keyway. Figure 7A pressing piece is installed in the pressing channel 542 , and the pressing piece has a shape substantially the same as that of the pressing channel 542 . The pressing piece is clamped in the pressing channel 542 and tightly cooperates with the connection key in the key slot to improve the connection stability between the rotating shaft 530 and the rocker arm 540 .

[0032] Structural reference of rocker arm 540 Figure 7 As shown, the rocker arm 540 has two connecting protrusions 543, and a connecting shaft 544 is installed between the two connecting protrusions 543. The connecting shaft 544 is arranged parallel to the rotating shaft 530, and the connecting rod 520 is sleeved outside the rotating shaft 530 and can rotate around the axis of the connecting shaft 544. The connecting shaft 544 is installed between the two connecting protrusions 543, and the connecting shaft 544 is detachable, so as to facilitate assembly and connection with the connecting rod 520.

[0033] In order to ensure the overall structural strength of the rocker arm 540, a reinforcing rib 545 is fixed between the two connecting protrusions 543 of the rocker arm 540. The reinforcing rib 545 is located on the side of the connecting shaft 544 close to the rotating shaft 530. Figure 7 shown.

[0034] When the stacking platform processes the material, the cover plate 200 to be used is first transmitted to the surface of the operating table 100 through the transmission belt, and then the cover plate 200 is connected to the rotating arm 400 by the connecting assembly 300. After that, the power assembly 500 can be started, and the driving motor 510 is used to drive the rotating arm 400 to rotate, and the cover plate 200 is rotated from the operating surface 110 to other positions, so that the operating surface 110 is exposed, so as to facilitate the placement of the material on the operating surface 110. After the material is placed on the operating surface 110, the power assembly 500 is started again, and the driving motor 510 is used to drive the rotating arm 400 to rotate, and the cover plate 200 is rotated from other positions to a position above the operating surface 110 and parallel to the operating surface 110, so that the cover plate 200 covers the material, and then the connection between the cover plate 200 and the connecting assembly 300 is released, and the cover plate 200 and the operating table 100 are clamped on both sides of the material.

[0035] In actual operation, in order to ensure that the cover 200 can rotate to the preset position each time and the rotation angle will not be too large or too small, in some embodiments of the present application, the power component 500 also includes an identification member 550 and two sensors 560 to limit the rotation angle of the rocker arm 540 to ensure that the rocker arm 540 can always rotate within a certain range.

[0036] In a specific implementation, the identification member 550 is fixedly connected to any rocker arm 540 and rotates synchronously with the rocker arm 540. Two sensors 560 are arranged around the rocker arm 540 on which the identification member 550 is installed, and the two sensors 560 are arranged on the rotation path of the identification member 550 to ensure that the sensor 560 can detect the identification member 550. The sensor 560 can transmit information to the drive motor 510 to control the drive motor 510. During the use of the stacking platform, the drive motor 510 drives the rocker arm 540 to rotate, and the identification member 550 fixed to the rocker arm 540 also rotates therewith until the identification member 550 rotates to the position where the sensor 560 is located, the sensor 560 detects the identification member 550, transmits information to the drive motor 510, and the drive motor 510 stops rotating. It should be noted that the rotation angle of the identification member 550 between the two sensors 560 is the rotation angle of the rotating arm 400. Therefore, when setting the positions of the sensor 560 and the identification member 550, it is necessary to set them in combination with the rotation range of the rotating arm 400.

[0037] The power assembly 500 also includes a stopper 570, see Figure 5 As shown, the limiter 570 is installed at the end of the rotating shaft 530 corresponding to the rotating arm 400, and the rocker arm 540 corresponding to the rotating arm 400 is located between the limiter 570 and the rotating arm 400, and the limiter 570 is limitedly matched with the rocker arm 540 corresponding to the rotating arm 400 along the end of the rotating shaft 530. The limiter 570 can limit the rocker arm 540 in the axial direction of the rotating shaft 530 to prevent the rocker arm 540 from being separated from the rotating shaft 530 along the axial direction of the rotating shaft 530. The rocker arm 540 corresponding to the driving motor 510 is not provided with the limiter 570, so that the position of the rocker arm 540 corresponding to the driving motor 510 can be easily adjusted, so as to fine-tune the position of the connecting rod 520, ensure that the axes of the two rocker arms 540 and the axis of the connecting rod 520 are all on the same plane, and ensure that the rocker arm 540 and the connecting rod 520 cooperate smoothly.

[0038] In some preferred embodiments, reference Figure 8 and Fig. 9 As shown, the limiting member 570 includes a limiting ring 571 and a limiting sheet 572. The limiting ring 571 is sleeved outside the rotating shaft 530 and abuts against the rocker arm 540. The tube wall of the limiting ring 571 has a mounting through hole, and an abutting member is installed in the mounting through hole. The abutting member passes through the mounting through hole and abuts against the peripheral wall of the rotating shaft 530, thereby fixing the limiting ring 571 on the rotating shaft 530. The abutting member generally uses a bolt. The limiting sheet 572 is arranged on the side of the limiting ring 571 away from the rocker arm 540. The limiting sheet 572 is detachably connected to the rotating shaft 530 and abuts against the limiting ring 571. The limiting sheet 572 is used to further fix the limiting ring 571.

[0039] The limiting member 570 is configured as a combination of a limiting ring 571 and a limiting sheet 572. On the one hand, the limiting ring 571 and the limiting sheet 572 are both fixed to the rotating shaft 530. Even if the detachable connection structure between the limiting sheet 572 and the rotating shaft 530 is separated during use, the limiting ring 571 is still fixed to the rotating shaft 530, and the rocker arm 540 can still be limited. On the other hand, the limiting sheet 572 is separately configured from the limiting ring 571, and the limiting sheet 572 covers the end of the limiting ring 571, so that the overall strength of the limiting member 570 is higher.

[0040] Since the cover plate 200 is too heavy, in actual operation, a protective structure needs to be provided for the cover plate 200 to prevent the cover plate 200 from accidentally falling off. Figure 1 , Figure 3 and Figure 4 As shown, the stacking platform also includes a safety clamp 600, which is rotatably mounted on the rotating arm 400, and the safety clamp 600 has a clamping cavity for accommodating the cover plate 200. When the cover plate 200 needs to be protected, the safety clamp 600 is rotated to accommodate the cover plate 200. When the cover plate 200 does not need to be protected, the safety clamp 600 is rotated to remove the safety clamp 600 from the cover plate 200 to release the protection of the cover plate 200. In a specific implementation, the safety clamp 600 is generally a U-shaped fork structure. When the cover plate 200 is located in the clamping cavity, the two sides of the U-shaped fork are respectively located on both sides of the cover plate 200. Even if the cover plate 200 is accidentally separated from the connecting assembly 300, the cover plate 200 falls under the action of gravity until it contacts the safety clamp 600, and is protected and limited by the safety clamp 600.

[0041] The stacking station also includes a cylinder 700, reference Figure 3 and Figure 4 As shown, the cylinder 700 is installed on the rotating arm 400, and the piston rod of the cylinder 700 is connected to the safety clamp 600. The cylinder 700 is used to drive the safety clamp 600 to rotate, and the rotation plane of the safety clamp 600 is parallel to the cover plate 200. The cylinder 700 and the safety clamp 600 are both installed on the rotating arm 400, rotate with the rotating arm 400, and the rotation plane of the safety clamp 600 is parallel to the cover plate 200. After the cylinder 700 is started, the cylinder 700 can drive the installation clamp to rotate, and the safety clamp 600 can smoothly rotate to both sides of the cover plate 200, or move away from the cover plate 200.

[0042] In the prior art, the piston rod is usually connected to the middle of the safety clamp 600. Figure 4As shown, along the thickness direction of the cover plate 200, the piston rod is connected to the part of the safety clamp 600 away from the rotating arm 400. Under the condition that the installation position of the cylinder 700 remains unchanged, the size of the safety clamp 600 can be reduced, so that the cylinder 700 can be connected to the part of the safety clamp 600 away from the rotating arm 400. After the size of the safety clamp 600 is reduced, the size of its clamping cavity is reduced. When clamped on both sides of the cover plate 200, the gap between the safety clamp 600 and the cover plate 200 is also reduced, and the distance between the safety clamp 600 and the cover plate 200 is closer. In this way, the protective effect of the safety clamp 600 on the cover plate 200 can be further improved, and the cover plate 200 can be prevented from being significantly offset in the process of falling to contact with the safety furniture after the cover plate 200 is accidentally separated from the connecting assembly 300.

[0043] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A stacking table for stacking circuit boards, characterized in that: It comprises an operating platform (100), a cover plate (200), a connecting assembly (300), a rotating arm (400) and a power assembly (500); The operating table (100) has an operating surface (110), the connecting assembly (300) is used to connect the cover plate (200), the rotating arm (400) is connected between the connecting assembly (300) and the power assembly (500), and the power assembly (500) is used to drive the rotating arm (400) to rotate, so that the cover plate (200) connected to the connecting assembly (300) rotates relative to the operating surface (110); The power assembly (500) comprises a driving motor (510), a connecting rod (520), two parallel rotating shafts (530) and two parallel rocker arms (540), wherein the rocker arms (540) are arranged in a one-to-one correspondence with the rotating shafts (530), the rocker arms (540) are key-connected to the corresponding rotating shafts (530), the connecting rod (520) is rotatably connected between the two rocker arms (540), one of the rotating shafts (530) is key-connected to the rotating arm (400), and the other rotating shaft (530) is key-connected to the driving motor (510), the driving motor (510) is used to drive the corresponding rotating shaft (530) to rotate, and drives the other rotating shaft (530) through the connecting rod (520) to drive the rotating arm (400) to rotate.

2. A circuit board stacking table according to claim 1, characterized in that: The connecting rod (520) includes two connecting sub-segments (521) and a middle segment (522). The two connecting sub-segments (521) are respectively located at the axial ends of the middle segment (522) and are both threadedly connected to the middle segment (522). The connecting sub-segments (521) correspond to the rocker arms (540) one by one, and the connecting sub-segments (521) are rotationally connected to the corresponding rocker arms (540).

3. A circuit board stacking table according to claim 2, characterized in that: One of the connecting sub-section (521) and the middle section (522) is provided with a thread groove (524), and the other is provided with a threaded portion (525), and the threaded portion (525) is threadedly installed in the thread groove (524); The connecting rod (520) further comprises a locking member (523), wherein the locking member (523) is threadedly connected to the outside of the threaded portion (525).

4. A stacking table for stacking circuit boards according to claim 1, characterized in that: The rocker arm (540) has an installation channel (541) for installing the rotating shaft (530), and the inner wall of the installation channel (541) is provided with a keyway for accommodating a connecting key. The rocker arm (540) also has a tightening channel (542), one end of which passes through the surface of the rocker arm (540) and the other end is connected to the keyway. A tightening member is installed in the tightening channel (542), and the tightening member is tightly matched with the connecting key in the keyway.

5. A circuit board stacking table according to claim 1, characterized in that: The rocker arm (540) has two connecting protrusions (543), a connecting shaft (544) is installed between the two connecting protrusions (543), the connecting shaft (544) is arranged parallel to the rotating shaft (530), and the connecting rod (520) is sleeved outside the connecting shaft (544) and can rotate around the axis of the connecting shaft (544).

6. A circuit board stacking table according to claim 5, characterized in that: A reinforcing rib (545) is also fixed between the two connecting protrusions (543), and the reinforcing rib (545) is located on a side of the connecting shaft (544) close to the rotating shaft (530).

7. A circuit board stacking table according to claim 1, characterized in that: The power assembly (500) also includes an identification member (550) and two sensors (560), wherein the identification member (550) is fixed to any one of the rocker arms (540), and the two sensors (560) are arranged around the rocker arm (540) corresponding to the identification member (550), and the two sensors (560) are both located on the rotation path of the identification member (550), and the sensors (560) are used to detect the identification member (550).

8. A circuit board stacking table according to claim 1, characterized in that: The power assembly (500) further comprises a limit member (570), wherein the limit member (570) is mounted on the end of the rotating shaft (530) corresponding to the rotating arm (400), and the rocker arm (540) corresponding to the rotating arm (400) is located between the limit member (570) and the rotating arm (400), and along the end of the rotating shaft (530), the limit member (570) and the rocker arm (540) corresponding to the rotating arm (400) are limitedly matched.

9. A circuit board stacking table according to claim 8, characterized in that: The limiting member (570) comprises a limiting ring (571) and a limiting plate (572); the limiting ring (571) is sleeved outside the rotating shaft (530) and abuts against the rocker arm (540); the tube wall of the limiting ring (571) has a mounting through hole, and an abutting member is installed in the mounting through hole, and the abutting member is tightly matched with the rotating shaft (530); the limiting plate (572) is located on a side of the limiting ring (571) away from the rocker arm (540); the limiting plate (572) abuts against the limiting ring (571), and the limiting ring (571) is detachably connected to the rotating shaft (530).

10. A stacking table for stacking circuit boards according to claim 1, characterized in that: The stacking platform further comprises a safety clamp (600) and a cylinder (700), wherein the safety clamp (600) is rotatably mounted on the rotating arm (400), the safety clamp (600) is used to accommodate a clamping cavity of the cover plate (200), the cylinder (700) is mounted on the rotating arm (400), and a piston rod of the cylinder (700) is connected to the safety clamp (600), the cylinder (700) is used to drive the safety clamp (600) to rotate, the rotation plane of the safety clamp (600) is parallel to the cover plate (200), and the safety clamp (600) is configured to be able to rotate to the position of the cover plate (200) under the drive of the cylinder (700), so that the cover plate (200) is located in the clamping cavity, or rotate from the cover plate (200) to the outside of the cover plate (200); Along the thickness direction of the cover plate (200), the piston rod is connected to a portion of the safety clamp (600) that is away from the rotating arm (400).

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