Circuit board feeding and discharging system

Abstract

The utility model relates to a circuit board feeding and discharging system which comprises a transferring device, the transferring device comprises a base and a transmission platform connected to the base in a sliding mode, the base extends in the first direction, and the transmission platform reciprocates in the first direction; the conveying platform comprises two supports arranged in a spaced mode and two conveying roller sets arranged on the supports respectively, each conveying roller set comprises at least one roller, the rollers move in the second direction, the multiple conveying devices and the transferring device are arranged in the second direction in a spaced mode, and the multiple conveying devices are arranged in the first direction in a spaced mode. In conclusion, according to the circuit board feeding and discharging system, through the arrangement, the production efficiency of the circuit board feeding and discharging system can be improved, and the risk that circuit boards are polluted in the circuit board conveying process of the circuit board feeding and discharging system is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of circuit board processing, and in particular to a circuit board loading and unloading system. Background Art

[0002] With the updating and iteration of production technology, the processing and manufacturing of circuit boards are gradually developing towards automation and intelligence. In the process of processing circuit boards, material transfer is first required to move the circuit boards to the processing area for processing.

[0003] In the prior art, circuit board loading and unloading systems mostly use single-channel roller or wheel conveyor lines to transport circuit boards. These conveyor lines have low transmission efficiency, and the rollers or wheels in the conveyor lines generate friction with the circuit boards during transportation. Powder from the circuit boards easily adheres to the surfaces of the rollers or wheels, and this powder then adheres to subsequent circuit boards transported by the rollers or wheels, contaminating subsequent circuit boards and affecting the quality of the finished products. Circuit board loading and unloading systems have low transmission efficiency and are prone to contamination of the circuit boards during transportation. Utility Model Content

[0004] Based on this, it is necessary to provide a circuit board loading and unloading system to address the problems of low transmission efficiency of the current circuit board loading and unloading system and easy contamination of the circuit board during the transmission process.

[0005] A circuit board loading and unloading system, comprising:

[0006] A transfer device, the transfer device comprising a base and a transmission platform slidably connected to the base, the base extending in a first direction, the transmission platform reciprocating in the first direction, the transmission platform comprising two spaced-apart brackets and two transmission roller groups respectively provided on the brackets, the transmission roller groups comprising at least one roller, the roller moving in a second direction;

[0007] A plurality of conveying devices are provided, wherein the plurality of conveying devices and the transfer device are spaced apart along the second direction, and the plurality of conveying devices are spaced apart along the first direction, the transmission platform reciprocates between the conveying devices, and the first direction and the second direction are intersected.

[0008] In one embodiment, the base includes a guide rail, and the transport platform includes a sliding member, and the sliding member is slidably connected to the guide rail.

[0009] In one embodiment, the two brackets are configured to move toward or away from each other along the first direction; the two brackets include two side surfaces that are oppositely arranged, and the two transmission roller groups are respectively arranged on the two side surfaces.

[0010] In one embodiment, the transmission platform further includes a screw;

[0011] The screw rod extends along the first direction, passes through the two brackets, and is threadedly connected to the two brackets; wherein, the rotation direction of the thread connecting the screw rod and one of the brackets is opposite to the rotation direction of the thread connecting the screw rod and the other bracket, so as to drive the two brackets to move toward or away from each other along the first direction.

[0012] In one embodiment, the base includes a driving module and a connecting shaft extending along the first direction, the connecting shaft is passed through one of the rollers in the transmission roller group and one of the rollers in the other first transmission roller group, and the driving module drives the connecting shaft to rotate to drive the rollers to rotate.

[0013] In one embodiment, the driving module includes a fixed end and a movable end, the fixed end is arranged on one of the brackets, and the movable end is connected to the connecting shaft to drive the connecting shaft to rotate around its own axis to drive the roller to rotate.

[0014] In one embodiment, the transmission roller assembly includes a plurality of the rollers and a transmission belt, the plurality of rollers are arranged on the side surface at intervals along the second direction, and the transmission belt is stretched on the outer circumference of the plurality of the rollers.

[0015] In one embodiment, the dimension of the roller along its own axis is less than or equal to the width of the process edge of the circuit board.

[0016] In one embodiment, a limiting member is provided at one end of the roller close to the corresponding bracket to limit the transmission direction of the circuit board.

[0017] In one embodiment, the transfer device further includes a baffle and a sensing device, wherein the sensing device and the baffle are arranged between the two brackets and are both arranged close to the conveying device. When the sensing device senses the circuit board, the baffle moves upward to move the circuit board away from the roller.

[0018] The circuit board loading and unloading system of this embodiment comprises a transfer device and multiple conveying devices spaced apart along a second direction, and multiple conveying devices spaced apart along a first direction. The transfer device comprises a base and a transfer platform slidably connected to the base, the base extending along the first direction, the transfer platform reciprocating along the first direction, the transfer platform comprising two spaced-apart brackets and two transfer roller assemblies respectively disposed on the brackets, so that a worker can place a circuit board on the rollers. The transfer platform drives the circuit board to move along the extension direction of the base between the multiple conveying devices, and then, when the transfer platform moves to one side of a target conveying device along the second direction, the rollers in the transfer roller assembly are used to transfer the circuit board along the second direction toward the target conveying device, so that the target conveying device can smoothly receive the circuit board. Since each conveying device is equivalent to a pipeline channel, and the transfer platform can move between the multiple conveying devices, transporting the circuit board to the vicinity of any conveying device for receipt by the target conveying device, the circuit board loading and unloading system of this embodiment has a multi-channel pipeline, which can improve production efficiency.

[0019] It should be noted that process edges are provided on both sides of the printed circuit area on the circuit board. Since the transmission platform includes two spaced-apart brackets and two transmission roller groups respectively arranged on the brackets, and the transmission roller group includes at least one roller, the staff can use two spaced-apart rollers to abut against the two process edges located on both sides of the printed circuit area, thereby supporting the circuit board. Because the rollers abut against the process edges of the circuit board, when the rollers rub against the circuit board and powder falling from the process edges of the circuit board adheres to the rollers, the powder will only stick back to the process edges of the subsequent circuit boards during the process of the rollers supporting the subsequent circuit boards, and will not contaminate the circuits in the printed circuit area of ​​the subsequent circuit boards, thereby reducing the risk of contamination of the circuit boards during the process of the transfer device transferring the circuit boards.

[0020] In summary, the circuit board loading and unloading system in this embodiment improves the production efficiency of the circuit board loading and unloading system through the above-mentioned settings, and reduces the risk of contamination of the circuit boards during the circuit board loading and unloading system's transportation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments or exemplary embodiments of the present application, the drawings required for use in the description of the embodiments or exemplary embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0022] Figure 1 This is a structural diagram of a circuit board loading and unloading system in one embodiment of the present application.

[0023] Figure 2 for Figure 1 The left side view of the circuit board loading and unloading system is shown.

[0024] Figure 3 for Figure 2 The diagram shows the structure of the transfer device in the circuit board loading and unloading system.

[0025] Figure 4 for Figure 3 A partial enlarged schematic diagram of point A in the transfer device shown.

[0026] Reference numerals:

[0027] Circuit board loading and unloading system 1000;

[0028] Transfer device 1100, base 1110, guide rail 1111, drive module 1112, connecting shaft 1113, transmission platform 1120, sliding member 1121, bracket 1122, transmission roller assembly 1123, screw rod 1124, baffle 1130, sensor device 1140;

[0029] Conveying device 1200. DETAILED DESCRIPTION

[0030] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0031] In the description of this application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0032] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of this application, if the term "plurality" appears, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0033] In this application, unless otherwise specified or limited, the terms "mounted," "connected," "connected," "fixed," etc., should be interpreted broadly. For example, these terms may refer to fixed connections, removable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediary; and internal communication between two components or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0034] In this application, unless otherwise expressly specified or limited, if a first feature is described as being "above" or "below" a second feature, or similar descriptions, this may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is described as being "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is described as being "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0035] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only embodiment.

[0036] See also Figures 1 to 3 , Figure 1A structural schematic diagram of a circuit board loading and unloading system in an embodiment of the present application is shown. An embodiment of the present application provides a circuit board loading and unloading system 1000, including: a transfer device 1100 and multiple conveying devices 1200, the transfer device 1100 includes a base 1110 and a transmission platform 1120 slidably connected to the base 1110, the base 1110 extends along a first direction, the transmission platform 1120 reciprocates along the first direction, the transmission platform 1120 includes two spaced-apart brackets 1122 and two transmission roller groups 1123 respectively arranged on the brackets 1122, the transmission roller group 1123 includes at least one roller (not shown in the figure), the roller moves along the second direction, the multiple conveying devices 1200 and the transfer device 1100 are spaced apart along the second direction, and the multiple conveying devices 1200 are arranged at intervals along the first direction, the transmission platform 1120 reciprocates between the conveying devices 1200, and the first direction and the second direction are intersecting.

[0037] The circuit board loading and unloading system 1000 in this embodiment is configured by arranging a transfer device 1100 and a plurality of conveying devices 1200 spaced apart along the second direction, and the plurality of conveying devices 1200 are spaced apart along the first direction, the transfer device 1100 includes a base 1110 and a transmission platform 1120 slidably connected to the base 1110, the base 1110 extends along the first direction, the transmission platform 1120 reciprocates along the first direction, and the transmission platform 1120 includes two spaced apart brackets 1122 and two brackets 1122 respectively arranged on the brackets 1110. The two transfer roller assemblies 1123 on the base 1110 facilitate workers placing circuit boards (not shown) on the rollers. The transfer platform 1120 then drives the circuit boards along the extension direction of the base 1110 between the multiple conveyor devices 1200. When the transfer platform 1120 moves to one side of the target conveyor device 1200 along the second direction, the rollers in the transfer roller assembly 1123 are used to transport the circuit boards along the second direction toward the target conveyor device 1200, allowing the target conveyor device 1200 to smoothly receive the circuit boards. Since each conveyor device 1200 is equivalent to a pipeline channel, and the transfer platform 1120 can move between the multiple conveyor devices 1200, transporting the circuit boards to the vicinity of any conveyor device 1200 for receipt by the target conveyor device 1200, the circuit board loading and unloading system 1000 of this embodiment has a multi-channel pipeline, which can improve production efficiency.

[0038] It should be noted that process edges (not shown) are provided on both sides of the printed circuit area (not shown) on the circuit board. Since the transmission platform 1120 includes two spaced-apart brackets 1122 and two transmission roller groups 1123 respectively arranged on the brackets 1122, and the transmission roller group 1123 includes at least one roller, the staff can use two spaced-apart rollers to abut against the two process edges located on both sides of the printed circuit area, thereby supporting the circuit board. Because the rollers abut against the process edges of the circuit board, when the rollers rub against the circuit board and powder falling from the process edges of the circuit board adheres to the rollers, the powder will only stick back to the process edges of the subsequent circuit board during the process of the rollers supporting the subsequent circuit boards, and will not contaminate the circuits in the printed circuit area of ​​the subsequent circuit boards, thereby reducing the risk of contamination of the circuit boards during the process of the transfer device 1100 transferring the circuit boards.

[0039] In summary, the circuit board loading and unloading system 1000 in this embodiment improves the production efficiency of the circuit board loading and unloading system 1000 through the above settings, and reduces the risk of contamination of the circuit boards during the circuit board loading and unloading system 1000's transmission of the circuit boards.

[0040] See also Figure 2 and Figure 3 In some embodiments, the base 1110 includes a guide rail 1111 , and the transport platform 1120 includes a sliding member 1121 , which is slidably connected to the guide rail 1111 .

[0041] In this embodiment, a sliding member 1121 is provided to be slidably connected to the guide rail 1111, so that the sliding member 1121 can reciprocate on the guide rail 1111 along a first direction, thereby driving the circuit board placed on the rollers in the two transmission roller groups 1123 to reciprocate between multiple conveying devices 1200, thereby facilitating the target conveying device 1200 to receive the circuit board.

[0042] In some embodiments, the bracket 1122 is disposed on a side of the sliding member 1121 facing away from the guide rail 1111 .

[0043] In this embodiment, the bracket 1122 is arranged on the side of the sliding member 1121 away from the guide rail 1111, so that the staff can drive the sliding member 1121 to slide on the guide rail 1111, thereby driving the bracket 1122 to move along the first direction between multiple conveying devices 1200, so that the circuit board placed on the rollers in the two transmission roller groups 1123 can reciprocate between the multiple conveying devices 1200.

[0044] See also Figure 2 and Figure 3In some embodiments, the two brackets 1122 are configured to move toward or away from each other along a first direction. The two brackets 1122 include two oppositely disposed side surfaces (not shown), and the two transmission roller assemblies 1123 are respectively disposed on the two side surfaces.

[0045] In this embodiment, the two brackets 1122 are configured to move toward or away from each other along a first direction. The two brackets 1122 include two opposing side surfaces, and two transfer roller assemblies 1123 are disposed on the two side surfaces. Based on the different sizes of the circuit boards to be transferred in the first direction, personnel can adjust the spacing between the two brackets 1122 in the first direction to adjust the distance between the two transfer roller assemblies 1123 and change the spacing between the rollers in one transfer roller assembly 1123 and the rollers in the other transfer roller assembly 1123, thereby meeting the transfer device 1100's requirements for transferring circuit boards of varying sizes. Furthermore, because the rollers in the transfer roller assembly 1123 do not contact the center area of ​​the circuit board during the entire process, the problem of board jamming can be reduced.

[0046] In some embodiments, the side surface of each bracket 1122 is located on a side of the bracket 1122 close to another bracket 1122 along the first direction.

[0047] Compared with the method of "the side surface of each bracket 1122 is located on the side of the bracket 1122 away from the other bracket 1122 along the first direction, and the two brackets 1122 are located between the two groups of transmission roller groups 1123", this embodiment arranges the side surface of each bracket 1122 to be located on the side of the bracket 1122 close to the other bracket 1122 along the first direction, so that the two groups of transmission roller groups 1123 are located between the two brackets 1122, thereby ensuring that when the rollers in the transmission roller group 1123 abut against the process edge of the circuit board, the two brackets 1122 are located on both sides of the circuit board along the first direction, avoiding contact between the bracket 1122 and the circuit board, and reducing the risk of contamination of subsequent circuit boards due to powder of the circuit board adhering to the bracket 1122.

[0048] See also Figure 2 and Figure 3 In some embodiments, the transmission platform 1120 further includes a screw rod 1124, which extends along a first direction, passes through the two brackets 1122, and is threadedly connected to the two brackets 1122; wherein the thread rotation direction of the screw rod 1124 and one bracket 1122 is opposite to the thread rotation direction of the screw rod 1124 and the other bracket 1122, so as to drive the two brackets 1122 to move toward or away from each other along the first direction.

[0049] In this embodiment, by setting the thread rotation direction of the connection between the screw rod 1124 and one bracket 1122 to be opposite to the thread rotation direction of the connection between the screw rod 1124 and another bracket 1122, the staff can drive the screw rod 1124 to rotate around its own axis to drive each bracket 1122 connected to the screw rod 1124 to move in the first direction along the threaded connection between itself and the screw rod 1124, thereby realizing the two brackets 1122 moving toward or away from each other in the first direction.

[0050] In some embodiments, the screw rod 1124 is located on a side of the sliding member 1121 away from the guide rail 1111 , the screw rod 1124 is rotationally connected to the sliding member 1121 , and is configured to rotate relative to the sliding member 1121 around its own central axis.

[0051] See also Figure 2 and Figure 3 In some embodiments, the base 1110 includes a driving module 1112 and a connecting shaft 1113 extending along a first direction. The connecting shaft 1113 passes through a roller in a transmission roller group 1123 and a roller in another transmission roller group 1123. The driving module 1112 drives the connecting shaft 1113 to rotate, thereby driving the rollers to rotate.

[0052] In this embodiment, by setting a connecting shaft 1113 to pass through a roller in the transmission roller group 1123 and a roller in the other transmission roller group 1123, when the driving module 1112 drives the connecting shaft 1113 to rotate, one roller in the transmission roller group 1123 and one roller in the other transmission roller group 1123 can be driven by the connecting shaft 1113 at the same time and rotate around the axis of the connecting shaft 1113, thereby transmitting the circuit board along the second direction toward the conveying device 1200.

[0053] See also Figure 2 and Figure 3 In some embodiments, the driving module 1112 includes a fixed end (not shown) and a movable end (not shown), the fixed end is arranged on one of the brackets 1122, and the movable end is connected to the connecting shaft 1113 to drive the connecting shaft 1113 to rotate around its own axis to drive the roller to rotate.

[0054] In this embodiment, the movable end drives the connecting shaft 1113 to rotate, and one roller in the transmission roller group 1123 and one roller in the other transmission roller group 1123 are simultaneously driven by the connecting shaft 1113 to rotate around the axis of the connecting shaft 1113 and transmit the circuit board to move along the second direction toward the conveying device 1200.

[0055] See also Figure 3 and Figure 4In some embodiments, the transmission roller assembly 1123 includes a plurality of rollers and a transmission belt (not shown), the plurality of rollers are arranged on the side at intervals along the second direction, and the transmission belt is stretched on the outer circumference of the plurality of rollers.

[0056] In this embodiment, multiple rollers are arranged on the side at intervals along the second direction, and the transmission belt is stretched on the outer peripheral surface of the multiple rollers, so that when the connecting shaft 1113 drives one roller in the transmission roller group 1123 to rotate, it can drive the transmission belt to move, and with the help of the transmission belt, drive the remaining rollers in the transmission roller group 1123 to rotate, thereby ensuring that all rollers in the transmission roller group 1123 rotate when transmitting the circuit board along the second direction.

[0057] In some embodiments, the conveyor belt is disposed within the bracket 1122 .

[0058] In this embodiment, by arranging the transmission belt in the bracket 1122, the transmission belt can be prevented from being exposed to the outside world and protected.

[0059] See also Figure 3 and Figure 4 In some embodiments, the dimension of the roller along its own axis is less than or equal to the width of the process edge of the circuit board.

[0060] In this embodiment, by setting the size of the roller along its own axis to be less than or equal to the width of the process edge of the circuit board, the risk of the outer peripheral surface of the roller contacting the printed circuit area on the circuit board when the roller abuts the process edge of the circuit board can be reduced, thereby preventing the powder on the roller from contaminating the circuit in the printed circuit area on the circuit board.

[0061] See also Figure 3 and Figure 4 In some embodiments, a limiting member (not shown) is provided at one end of the roller close to the corresponding bracket 1122 to limit the transmission direction of the circuit board.

[0062] In this embodiment, a limiter is provided at one end of the roller close to the corresponding bracket 1122, and the limiter is configured to limit the transmission direction of the circuit board, thereby preventing the circuit board from deviating along the first direction toward the bracket 1122 during the process of the roller transmitting the circuit board.

[0063] See also Figure 3 and Figure 4 In some embodiments, the transfer device 1100 further includes a baffle 1130 and a sensing device 1140. The sensing device 1140 and the baffle 1130 are disposed between the two brackets 1122 and are both disposed close to the conveying device 1200. When the sensing device 1140 senses the circuit board, the baffle 1130 moves upward to move the circuit board away from the roller.

[0064] In this embodiment, when the sensing device 1140 senses the circuit board, the baffle 1130 moves upward to keep the circuit board away from the roller, thereby preventing the circuit board from falling off the transmission platform 1120 or being stuck on the transmission platform 1120 when the circuit board unloading and loading system 1000 is changed from a single channel to a multi-channel.

[0065] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0066] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A circuit board loading and unloading system, characterized in that: The circuit board loading and unloading system includes: A transfer device, the transfer device comprising a base and a transmission platform slidably connected to the base, the base extending in a first direction, the transmission platform reciprocating in the first direction, the transmission platform comprising two spaced-apart brackets and two transmission roller groups respectively provided on the brackets, the transmission roller groups comprising at least one roller, the roller moving in a second direction; a plurality of conveying devices, wherein the plurality of conveying devices and the transfer device are spaced apart along the second direction, and the plurality of conveying devices are spaced apart along the first direction, and the transmission platform reciprocates between the conveying devices; The first direction and the second direction are arranged to intersect.

2. The circuit board loading and unloading system according to claim 1, characterized in that: The base includes a guide rail, and the transmission platform includes a sliding member, which is slidably connected to the guide rail.

3. The circuit board loading and unloading system according to claim 1, characterized in that: The two brackets are configured to move toward or away from each other along the first direction; The two brackets include two side surfaces that are arranged opposite to each other, and the two transmission roller groups are respectively arranged on the two side surfaces.

4. The circuit board loading and unloading system according to claim 3, characterized in that: The transmission platform also includes a screw rod; The screw rod extends along the first direction, passes through the two brackets, and is threadedly connected to the two brackets; wherein, the rotation direction of the thread connecting the screw rod and one of the brackets is opposite to the rotation direction of the thread connecting the screw rod and the other bracket, so as to drive the two brackets to move toward or away from each other along the first direction.

5. The circuit board loading and unloading system according to claim 1, characterized in that: The base includes a driving module and a connecting shaft extending along the first direction. The connecting shaft passes through one of the rollers in the transmission roller group and one of the rollers in the other transmission roller group. The driving module drives the connecting shaft to rotate to drive the rollers to rotate.

6. The circuit board loading and unloading system according to claim 5, characterized in that: The driving module includes a fixed end and a movable end. The fixed end is arranged on one of the brackets. The movable end is connected to the connecting shaft to drive the connecting shaft to rotate around its own axis, thereby driving the roller to rotate.

7. The circuit board loading and unloading system according to claim 3, characterized in that: The transmission roller assembly includes a plurality of rollers and a transmission belt. The plurality of rollers are arranged on the side surface at intervals along the second direction, and the transmission belt is stretched on the outer circumference of the plurality of rollers.

8. The circuit board loading and unloading system according to claim 1, characterized in that: The dimension of the roller along its own axis is less than or equal to the width of the process edge of the circuit board.

9. The circuit board loading and unloading system according to claim 1, characterized in that: A limiting member is provided at one end of the roller close to the corresponding bracket to limit the transmission direction of the circuit board.

10. The circuit board loading and unloading system according to claim 1, characterized in that: The transfer device also includes a baffle and a sensor device, which are arranged between the two brackets and are both arranged close to the conveying device. When the sensor device senses the circuit board, the baffle moves upward to keep the circuit board away from the roller.

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