A board conveying device and an optical detection apparatus

Abstract

The application discloses a board conveying device and an optical detection equipment. The conveying device comprises a conveying mechanism and a pressing plate mechanism. The pressing plate mechanism is installed at one end or both ends of the conveying mechanism. The pressing plate mechanism comprises a base, a connecting piece, an elastic piece, a pressing assembly and an adjusting piece. One end of the connecting piece is movably connected with the base. The other end of the connecting piece is connected with the pressing assembly. The pressing assembly is arranged above a conveying belt of the conveying mechanism. The adjusting piece is movably arranged on the base. The elastic piece is arranged between the adjusting piece and the connecting piece. The application increases the conveying friction of the board on the conveying mechanism, reduces the risk of the board being stuck at the docking position, prevents the board from being lifted out of the track and beyond the risk of the track blocking edge, and can adjust the elastic compression amount of the elastic piece, thereby adjusting the size of the downward pressure on the board.

Description

Technical Field

[0001] This application relates to the technical field of conveying devices, and more particularly to a board conveying device and an optical inspection device. Background Technology

[0002] In the electronics manufacturing and related industries, the transport of PCBs (Printed Circuit Boards) is a critical link in the production process, and its stability and accuracy directly affect product quality and production efficiency. For lighter PCBs, due to their smaller weight, the positive pressure generated between the PCB and the conveyor belt is correspondingly smaller. According to the principle of friction, friction is proportional to positive pressure, resulting in insufficient transport friction between the belt and the PCB. This problem is particularly pronounced during the critical track docking stage. When two tracks dock, the transport friction is less than the friction between the track guards and the PCB, preventing the PCB from continuing smoothly along the transport direction. Instead, it gets stuck at the docking point of the two tracks, failing to complete the normal docking and transport task.

[0003] Furthermore, in some cases, due to unstable factors during the transport process and uneven friction, lighter PCB boards may tilt at the mating point. Once the board tilts beyond the guide rail edge, it will not only disrupt the normal production process, but may also cause the board to fall and be damaged, thereby increasing production costs and potentially damaging the production equipment, affecting the stable operation of the entire production line. Utility Model Content

[0004] The purpose of this invention is to provide a board conveying device and an optical inspection equipment, which can solve the above-mentioned problems existing in the prior art.

[0005] To achieve the above objectives, this application adopts the following technical solution: On one hand, a plate conveying device is provided, comprising: a conveying mechanism and a pressing mechanism. The pressing mechanism is installed at one or both ends of the conveying mechanism. The pressing mechanism includes a base, a connecting member, an elastic member, a pressing assembly, and an adjusting member. One end of the connecting member is movably connected to the base, and the other end of the connecting member is connected to the pressing assembly. The pressing assembly is disposed above the conveyor belt of the conveying mechanism. The elastic member is disposed between the adjusting member and the connecting member. The adjusting member is movably disposed on the base and can move towards or away from the elastic member. By adjusting the position of the adjusting member, the compression of the elastic member can be increased or decreased, allowing the pressing assembly to adapt to pressing plates of different thicknesses on the conveyor belt, ensuring stable conveying and a flexible and easily adjustable structure.

[0006] Furthermore, the connector is rotatably mounted on the base via a rotating shaft. This rotatable mounting allows the clamping assembly to swing flexibly around the shaft, better adapting to plates of different thicknesses, ensuring stable delivery, and improving device compatibility and ease of operation.

[0007] Furthermore, the adjusting component includes a main body and an anti-detachment part. The main body is connected to the base, and the anti-detachment part is opposite to at least one end of the rotating shaft. The main body is connected to the base, and the anti-detachment part limits the end of the rotating shaft to prevent the connecting component from falling off, ensuring stable operation of the pressing assembly and improving the reliability of the conveying process and the durability of the device.

[0008] Furthermore, the elastic element is a torsion spring, which includes a helical tube, a first torsion arm, and a second torsion arm. The helical tube is sleeved on the rotating shaft, the first torsion arm contacts the main body, and the second torsion arm contacts the connecting member. Using a torsion spring as the elastic element, with its helical tube precisely positioned on the rotating shaft and the two torsion arms respectively contacting the main body and the connecting member, provides a stable elastic force, allowing the clamping assembly to adaptively clamp the plate, ensuring smooth conveying and a compact and reliable structure.

[0009] Furthermore, the adjusting member is mounted on the base via an adjustable fixing member. The main body has an adjusting hole, and the base has a locking hole. The adjustable fixing member is locked into the locking hole via the adjusting hole, and can be locked at different positions within the adjusting hole to achieve vertical adjustment of the main body. By locking the main body at different positions with the adjustable fixing member, the vertical adjustment of the main body can be achieved, allowing for flexible adjustment of the pressure of the clamping assembly, adapting to various board conveying requirements, and improving the versatility and practicality of the device.

[0010] Furthermore, the connector has a through hole, and a locking member is provided at the through hole. The bottom end of the locking member can pass through the through hole and contact the base. The locking member can assist in adjusting and fixing the position of the connector, enhance the stability of the clamping assembly, ensure reliable clamping and conveying of different boards, and improve the overall performance of the device.

[0011] Furthermore, the clamping assembly includes a pressure roller, a bearing component, and an insulating ring. The pressure roller is driven to the connecting component via the bearing component, and the insulating ring is sleeved on the outer periphery of the pressure roller. The drive connection between the pressure roller and the connecting component via the bearing component ensures smooth rotation, and the insulating ring on the outer periphery of the pressure roller effectively prevents electrostatic conduction, avoids electrostatic damage to the electronic components of the circuit board, and ensures safe and high-quality transport.

[0012] Furthermore, the pressure roller includes a concentrically arranged outer wheel portion and a support portion. The radius of the outer wheel portion is larger than the radius of the support portion. A circular groove is provided on the outer circumference of the outer wheel portion, and the insulating ring is installed in the circular groove. This structure can ensure effective contact and pressing with the circuit board, reduce the friction area with the circuit board, reduce wear, and is suitable for conveying most products. In addition, the circular groove ensures accurate positioning and stable assembly of the insulating ring.

[0013] Furthermore, the connector is also provided with a grounding hole. The grounding hole allows for easy connection of the device to a grounding system, enabling any static electricity that may be generated to be conducted away in a timely manner, further enhancing the anti-static effect.

[0014] On the other hand, an optical inspection device is also provided, including the board conveying device described above.

[0015] The beneficial effects of this application are as follows: First, by adopting a rotating downward pressing method, the clamping component can provide stable and effective downward pressure to the board when it enters and exits the conveyor mechanism, which significantly increases the friction between the board and the conveyor belt. This enables the conveyor mechanism to overcome the problem of insufficient friction caused by the small weight of the board and insufficient positive pressure when conveying lighter PCB boards, greatly improving the success rate of board entering and exiting the conveyor mechanism and ensuring the smooth progress of the conveying process.

[0016] Secondly, this device effectively prevents the circuit board from tilting and moving out of the guard at the docking position. When the circuit board is conveyed to the track docking position, the continuous downward pressure ensures that the circuit board remains in close contact with the conveyor belt, avoiding tilting caused by unstable conveying or uneven friction. This reduces the risk of the circuit board falling or being damaged, and reduces losses and costs in the production process.

[0017] Furthermore, the design of the adjusting mechanism gives the device a high degree of flexibility and adaptability. Operators can easily adjust the position of the adjusting mechanism and change the initial compression angle of the elastic element according to the characteristics of different types of plates, such as weight and material, as well as the actual conveying requirements in production. This adjustability allows the plate conveying device to be widely used in a variety of different production scenarios, improving the device's versatility and practicality. Attached Figure Description

[0018] The present application will now be described in further detail with reference to the accompanying drawings and embodiments.

[0019] Figure 1 This is a perspective view of the board conveying device described in the embodiments of this application; Figure 2 This is a schematic diagram of the board before the components are inserted into the circuit board, as described in this application embodiment. Figure 3 This is a schematic diagram of the board after being installed in an embodiment of this application; Figure 4 This is a perspective view of the pressure plate mechanism described in the embodiments of this application; Figure 5 This is a front view of the pressure plate mechanism described in the embodiments of this application; Figure 6 This is an exploded view of the pressure plate mechanism described in the embodiments of this application; Figure 7 This is a cross-sectional view (excluding the insulating ring) of the pressure roller assembly described in the embodiments of this application. Figure 8 This is a perspective view of the elastic element described in the embodiments of this application; Figure 9 This is a perspective view of the adjusting member described in the embodiment of this application.

[0020] In the diagram: 1. Conveying mechanism; 101. Conveyor belt; 2. Pressure plate mechanism; 201. Base; 202. Connector; 203. Elastic element; 204. Pressing assembly; 205. Adjusting element; 206. Rotating shaft; 207. Adjustable fixing element; 208. Setter; 209. Anti-loosening screw; 2011. Locking hole; 2021. Through hole; 2022. Grounding hole; 2031. Spiral tube section; 2032. First torsion arm; 2033, second torsion arm; 2041, pressure roller; 2042, bearing component; 2043, insulating ring; 2051, main body; 2052, anti-detachment part; 2053, adjustment hole; 2054, groove; 20411, mounting hole; 20412, outer wheel part; 20413, bearing part; 20414, circular groove; 20421, deep groove ball bearing; 20422, rotating shaft; 3, plate. Detailed Implementation

[0021] To make the technical problems solved by this application, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the embodiments of this application are further described in detail below. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0022] In the description of this application, unless otherwise expressly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0023] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0024] In the electronics manufacturing and related industries, the existing mainstream technologies for PCB board transportation mainly focus on the basic design and optimization of the transportation mechanism to meet basic transportation functions. However, there are significant deficiencies in terms of adaptability and versatility.

[0025] Existing conveying devices typically consist only of a conveying mechanism, with the conveyor belt as its core component. The movement of the conveyor belt itself drives the movement of the pallets. During the conveying process, the contact pressure between the conveyor belt and the pallets is fixed and cannot be adjusted. This fixed pressure mode is based on experience conveying pallets of typical weight and material, and it exposes numerous problems when facing diverse production demands.

[0026] In terms of board type, the market offers a wide variety of PCB board specifications, with significant differences in weight and materials. For example, some PCB boards made with new lightweight materials are much lighter than traditional boards; and certain special-purpose boards may have different friction characteristics with the conveyor belt due to surface treatment processes or internal structures. However, existing conveyor systems cannot specifically adjust the pressure during the conveying process based on these differences in board characteristics.

[0027] In actual production scenarios, the requirements for circuit board conveying vary across different production stages. In high-speed conveying stages, a large frictional force is needed to ensure stable circuit board transport, requiring the conveyor belt to apply significant pressure to the boards. However, in stages where high surface quality is critical, such as before precision surface mounting, excessive pressure may damage the circuit board surface, necessitating lower pressure. Current technology cannot flexibly adjust the conveyor pressure to meet these diverse production needs.

[0028] Due to the lack of pressure regulation, existing conveying devices often encounter the following problems when conveying lighter PCB boards: Unstable conveying: For lighter plates, the fixed pressure may not provide enough friction, causing the plates to slip or shake during conveying, affecting the accuracy and stability of the conveying, and thus reducing production efficiency.

[0029] Circuit boards are easily damaged: When conveying circuit boards with fragile surfaces or sensitive to pressure, the fixing pressure may be too high, causing damage such as scratches and deformation, increasing the product defect rate and production costs.

[0030] Poor versatility: Due to its inability to adapt to the conveying needs of different types and specifications of circuit boards, the versatility of existing conveying devices is greatly limited. They can only be applied to specific production scenarios and are difficult to meet the increasingly diversified and personalized production needs of the electronics manufacturing industry.

[0031] like Figures 1-9 As shown, this embodiment provides a board conveying device, including: a conveying mechanism 1 and a pressing mechanism 2. The pressing mechanism 2 is installed at one or both ends of the conveying mechanism 1. The pressing mechanism 2 includes a base 201, a connector 202, an elastic member 203, a pressing assembly 204, and an adjusting member 205. One end of the connector 202 is movably connected to the base 201, and the other end of the connector 202 is connected to the pressing assembly 204. The pressing assembly 204 is disposed above the conveyor belt 101 of the conveying mechanism 1. The elastic member 203 is disposed between the adjusting member 205 and the connector 202. The adjusting member 205 is movably disposed on the base 201, and the adjusting member 202 can move toward or away from the elastic member 203. The elastic member 203 causes the pressing assembly 204 installed on the connector 202 to always have a tendency to move toward the conveyor belt 101.

[0032] In the board conveying device provided in this embodiment, the conveying mechanism 1 undertakes the basic task of conveying the board 3, while the pressure plate mechanism 2 focuses on solving key problems such as the inability to adjust the pressure and unstable conveying in the prior art. The pressure plate mechanism 2 is installed at one or both ends of the conveying mechanism 1. Its base 201 serves as the fixed foundation of the entire pressure plate mechanism 2, providing stable support for other components. Moreover, the base 201 and the conveying mechanism 1 are detachably connected, enabling quick assembly and disassembly. One end of the connecting member 202 is movably connected to the base 201. This movable connection gives the connecting member 202 a certain degree of freedom of movement, allowing it to drive the connected pressing assembly 204 to move flexibly. The pressing assembly 204 is located above the conveyor belt 101 of the conveying mechanism 1 and is the component that directly applies force to the board 3. The adjusting member 205 is movably mounted on the base 201, and the elastic member 203 is located between the adjusting member 205 and the connecting member 202. When the position of the adjusting member 205 on the base 201 changes, the initial compression angle of the elastic member 203 will change accordingly. Specifically, the elastic member 203 can be compressed by moving the adjusting member 205 toward the elastic member 203, or the elastic member 205 can be released by moving the adjusting member 205 away from the elastic member 203.

[0033] Since the elastic force of the elastic element 203 is closely related to its initial compression angle, the elastic force of the elastic element 203 can be changed by adjusting the position of the adjusting element 205. The change in the elastic force of the elastic element 203 is transmitted to the connecting element 202, which in turn affects the downward pressure applied by the clamping assembly 204 to the plate 3. The elastic element 203 ensures that the clamping assembly 204, installed on the connecting element 202, always tends to move in the direction of the conveyor belt 101. When the plate 3 enters or exits the conveying mechanism 1, the clamping assembly 204 applies a stable downward pressure to the plate 3 under the action of the elastic element 203, increasing the positive pressure between the plate 3 and the conveyor belt 101. According to the principle of friction, the increased positive pressure increases the friction, thereby ensuring the stability of the plate 3 during the conveying process and preventing the plate 3 from slipping or jamming due to insufficient friction.

[0034] Crucially, the innovative design of having the adjusting element 205 movably mounted on the base 201 and the elastic element 203 positioned between the adjusting element 205 and the connecting element 202 provides the device with flexible pressure adjustment capabilities. Operators can precisely adjust the downward pressure applied to the board 3 by simply adjusting the position of the adjusting element 205, changing the initial compression angle of the elastic element 203, based on the characteristics of different types and specifications of the board 3, such as weight, material, and surface friction coefficient, as well as different production needs, such as the need for greater friction during high-speed transport or less pressure before precision processes to avoid damaging the board 3 surface. This pressure adjustment function greatly improves the device's versatility and adaptability, enabling it to meet the increasingly diverse and personalized production needs of the electronics manufacturing industry and reducing production limitations and cost increases caused by equipment incompatibility.

[0035] Optionally, the conveyor belt can be one of the following: a belt, a chain, or rollers. The belt is made of a material with a certain degree of flexibility, such as rubber or plastic, and has a smooth surface and relatively soft texture. During the conveying process of the pallet 3, it can form good contact with the pallet 3, reducing the bumps and shaking of the pallet 3 during transport.

[0036] It is important to note that the pressure plate mechanism 2 can be installed at one or both ends of the conveying mechanism 1, depending on the conveying requirements. Specifically, in some small electronics processing plants, PCB boards 3 are fed into the pre-processing line from one end, undergo simple cleaning and drying, and then directly conveyed to the placement machine. Since the pre-processing is relatively simple, the PCB boards 3 mainly need to remain stable at the starting end during conveying to prevent offset or jamming during loading and initial conveying. Therefore, simply installing the pressure plate mechanism 2 at the starting end of the conveying mechanism 1 can ensure that the PCB boards 3 smoothly enter the subsequent processing stages. Alternatively, in large PCB manufacturing plants, the PCB boards 3 need to be transported over long distances on conveyor lines, from raw material warehousing, pre-processing, placement, soldering to final testing and packaging; the conveying distance may reach tens of meters or even longer. Due to the long conveying distance, the boards 3 are easily affected by various factors during conveying, causing offset or shaking. By setting pressure plate mechanisms 2 at both ends of the conveying mechanism 1, and cooperating with the guide device in the middle, it can be ensured that the plate 3 remains stable throughout the conveying process, reducing damage to the plate 3 and the occurrence of conveying failures, and improving production efficiency.

[0037] Optionally, the connector 202 is rotatably mounted on the base 201 via the rotating shaft 206. Specifically, the connection between the connector 202 and the base 201 is a rotatable connection. Before the plate enters the conveyor belt, the gap between the clamping assembly 204 and the conveyor belt 101 is small. After the plate enters, since the plate 3 is conveyed between the clamping assembly 204 and the conveyor belt 101, the clamping assembly 204 and the connector 202 rotate around the rotating shaft 206. The elastic force applied to the connector 202 by the elastic element 203 enables the clamping assembly 204 to clamp the plate 3, ensuring sufficient friction between the plate 3 and the conveyor belt 101, thus guaranteeing stable and smooth transportation.

[0038] Furthermore, when it is necessary to increase the pressure on the board 3, the adjusting member 205 increases the compression of the elastic member 203, and the connecting member 202 rotates downward around the rotating shaft 206, driving the pressing assembly 204 to move downward, thereby increasing the downward pressure on the board 3; conversely, when it is necessary to reduce the pressure, the adjusting member 205 changes the state of the elastic member 203, the connecting member 202 rotates upward around the rotating shaft 206, and the pressing assembly 204 rises accordingly, reducing the pressure on the board 3.

[0039] As an optional specific implementation, the connection between the connector 202 and the base 201 can also be a linear sliding connection or an elastic connection. Specifically, a linear sliding connection involves installing a linear guide rail on the base 201, and fixing a matching slider to the connector 202. The slider can slide linearly along the guide rail, thereby achieving linear movement of the connector 202 relative to the base 201. For example, a common ball bearing linear guide has an internal ball circulation system that converts sliding friction into rolling friction, greatly reducing friction and making the sliding of the connector 202 smoother. An elastic connection involves installing a spring between the connector 202 and the base 201, utilizing the elastic deformation of the spring to achieve movement of the connector 202 relative to the base 201. When subjected to external force, the spring is compressed or stretched, and the connector 202 moves accordingly; when the external force disappears, the spring returns to its original shape, causing the connector 202 to return to its initial position.

[0040] In some embodiments, the adjusting member 205 includes a main body 2051 and an anti-detachment part 2052. The main body 2051 is connected to the base 201, and the anti-detachment part 2052 is opposite to at least one end of the rotating shaft 206. In a rotatably connected plate conveying device, the rotating shaft 206 is usually installed with a clearance fit. Although this installation method facilitates assembly and ensures rotational flexibility, during operation, due to factors such as vibration generated by the device operation, external impact, and wear after long-term use, the rotating shaft 206 is prone to loosening. In the supplementary adjusting member 205 structure, the main body 2051 is connected to the base 201. By operating on the main body 2051, such as rotating or moving, the relative positional relationship between the main body 2051 and the elastic member 203 can be changed, thereby adjusting the elastic compression of the elastic member 203. Changes in the compression of the elastic element 203 directly affect its elastic force, which is transmitted to the clamping assembly 204 through the connector 202, ultimately adjusting the pressure applied by the clamping assembly 204 to the plate 3. An anti-detachment part 2052 is located at at least one end of the main body 2051. During operation, when the rotating shaft 206 tends to loosen to one side, the anti-detachment part 2052 on that side contacts the end of the rotating shaft 206. Since the anti-detachment part 2052 is fixed in position, it obstructs the movement of the rotating shaft 206, thereby limiting its outward movement and preventing it from detaching from the rotating connection structure between the connector 202 and the base 201, ensuring the stability and reliability of the entire rotating connection system. It should be noted that when the rotating shaft 206 does not show any tendency to loosen, the anti-detachment part 2052 does not contact the rotating shaft 206, avoiding excessive contact that could cause wear on the rotating shaft 206.

[0041] In addition, the anti-detachment part 2052 can also be adjusted in its installation position according to the design of the rotating shaft 206. It can be set at both ends of the main body 2051. That is, the anti-detachment part 2052 set at both ends corresponds to and limits both ends of the rotating shaft 206 to ensure that the rotating shaft 206 will not come loose.

[0042] In one alternative embodiment, the anti-detachment part 2052 protrudes vertically from the main body part 2051, thereby limiting the rotation shaft 206 while reducing the size and weight of the main body part 2051.

[0043] In addition, the anti-detachment part 2052 is set on the main body 2051, or the main body 2051 and the anti-detachment part 2052 are integrally formed. The anti-detachment part 2052 can move up and down synchronously with the main body 2051. When the rotating shaft 206 needs to be disassembled or repaired, the rotating shaft 206 can be repaired by moving the anti-detachment part 2052 down.

[0044] Furthermore, the elastic element 203 can be a torsion spring, which includes a helical tube portion 2031, a first torsion arm 2032, and a second torsion arm 2033. The first torsion arm 2032 and the second torsion arm 2033 are fixed to the two ends of the helical tube portion 2031 respectively. The helical tube portion 2031 is sleeved on the rotating shaft 206. The first torsion arm 2032 contacts the main body portion 2051, and the second torsion arm 2033 contacts the connecting member 202. Since the first torsion arm 2032 is in contact with the main body portion 2051, the movement of the main body portion 2051 will exert a force on the first torsion arm 2032, causing the helical tube portion 2031 of the torsion spring to undergo torsional deformation. Because the helical tube portion 2031 is sleeved on the rotating shaft 206, its torsional deformation will be transmitted through the interaction between the helical tube portion 2031 and the rotating shaft 206. Simultaneously, the second torsion arm 2033 contacts the connector 202, and the torsional deformation of the spiral tube 2031 causes the second torsion arm 2033 to exert a reverse force on the connector 202. This force causes the connector 202 to rotate around the rotation axis 206, thereby causing the clamping assembly 204 mounted on the connector 202 to move accordingly. When it is necessary to increase the pressure of the clamping assembly 204 on the plate 3, the adjusting body 2051 causes the first torsion arm 2032 to be subjected to a greater force, the torsional deformation of the torsion spring increases, and the force of the second torsion arm 2033 on the connector 202 also increases. The rotation of the connector 202 causes the clamping assembly 204 to move closer to the plate 3 on the conveyor belt 101, increasing the pressure. Conversely, when it is necessary to reduce the pressure, the adjusting body 2051 reduces the force on the first torsion arm 2032, the torsional deformation of the torsion spring decreases, the force of the second torsion arm 2033 on the connector 202 decreases, and the clamping assembly 204 moves away from the plate 3, reducing the pressure.

[0045] Meanwhile, a slot 2054 is provided on the main body 2051 to limit the position of the first torsion arm 2032, so that the radial position of the first torsion arm 2032 is relatively fixed, preventing the elastic compression force from becoming uncontrollable due to an excessive difference in angle between the first torsion arm 2032 and the second torsion arm 2033. During the operation of the plate conveying device, the torsion spring transmits force to the main body 2051 and the connecting member 202 respectively through the torsional deformation of its helical tube 2031, via the first torsion arm 2032 and the second torsion arm 2033, thereby adjusting the pressure of the clamping assembly 204 on the plate 3. However, if the radial position of the first torsion arm 2032 is not fixed, it may shift radially under the influence of factors such as vibration generated during device operation and external force interference. This shift will change the relative angular relationship between the first torsion arm 2032 and the second torsion arm 2033. Since the elastic force of the torsion spring is closely related to the relative angle between the two torsion arms, abnormal changes in the angle can lead to uncontrolled elastic compression force, resulting in unstable pressure exerted by the clamping assembly 204 on the board 3 and affecting the normal transport of the board 3. By creating a slot 2054 on the main body 2051 to limit the position of the first torsion arm 2032, the slot 2054 constrains the first torsion arm 2032. When the first torsion arm 2032 tends to deviate radially due to various factors, the sidewall of the slot 2054 prevents this deviation, keeping the radial position of the first torsion arm 2032 relatively fixed. In this way, the relative angle between the first torsion arm 2032 and the second torsion arm 2033 can be maintained in a relatively stable state, and the elastic compression force of the torsion spring can be effectively controlled, ensuring stable pressure exerted by the clamping assembly 204 on the board 3.

[0046] Furthermore, the adjusting member 205 is mounted on the base 201 via the adjustable fixing member 207. The main body 2051 is provided with an adjusting hole 2053, which can be a slotted hole, a strip-shaped hole, an arc-shaped hole, etc. The base 201 is provided with a locking hole 2011. The adjustable fixing member 207 is locked in the locking hole 2011 via the adjusting hole 2053, and the adjustable fixing member 207 can be locked in different positions of the adjusting hole 2053 to achieve vertical adjustment of the main body 2051. When it is necessary to adjust the position of the main body 2051, the operator first loosens the adjustable fixing member 207 to release the locking state between it and the base 201. At this time, due to the existence of the adjusting hole 2053, the main body 2051 can move up and down relative to the base 201 along the length direction of the adjusting hole 2053. According to the pressure adjustment requirements, the operator moves the main body 2051 to a suitable position and then retightens the adjustable fixing part 207 so that it passes through the adjustment hole 2053 and locks into the locking hole 2011 on the base 201, thereby fixing the main body 2051 in that position. The change in the position of the main body 2051 will cause the first torsion arm 2032 of the torsion spring in contact with it to move, thereby changing the degree of torsional deformation of the torsion spring, and finally causing the connecting part 202 to drive the clamping assembly 204 to change the pressure on the plate 3 through the second torsion arm 2033.

[0047] The fine-tuning scheme implemented using the adjustable fastener 207 and the adjusting hole 2053 has a simple and easy-to-understand structure, allowing operators to adjust the main body 2051 without complex tools or specialized skills. Simply loosening and tightening the adjustable fastener 207 allows the main body 2051 to be moved and fixed, significantly reducing adjustment time and improving production efficiency. Simultaneously, the design of the adjusting hole 2053 provides a certain margin of error during the adjustment process; operators do not need to precisely align with specific hole positions, but can simply move the device within the range of the adjusting hole 2053, further reducing operational difficulty.

[0048] Specifically, the connector 202 has a through hole 2021, and a locking member 208 is provided at the through hole 2021. The bottom end of the locking member 208 can pass through the through hole 2021 and contact the base 201. When it is necessary to adjust the initial contact gap between the clamping assembly 204 and the conveyor belt 101, the operator can operate the locking member 208 with a tool. Since the bottom end of the locking member 208 can pass through the through hole 2021 and contact the base 201, when the locking member 208 is rotated clockwise or counterclockwise (taking a common threaded locking member 208 as an example), the locking member 208 will move up and down relative to the connector 202 under the action of the thread. When the locking member 208 moves downward and gradually approaches the base 201, it pushes the connecting member 202 upward, thereby causing the clamping assembly 204 mounted on the connecting member 202 to lift upward, increasing the initial contact gap between the clamping assembly 204 and the conveyor belt 101. Conversely, when the locking member 208 moves upward away from the base 201, the connecting member 202 moves downward under its own weight or the action of other related structures, and the clamping assembly 204 also descends, reducing the initial contact gap. By precisely adjusting the locking member 208, the initial contact gap can be controlled within a suitable range.

[0049] Meanwhile, since the through hole 2021 on the connector 202 penetrates the top and bottom surfaces of the connector 202, in order to ensure the stability of the fastener 208, anti-loosening screws 209 are provided on the side of the connector 202 to help fix the fastener 208 and prevent the fastener 208 from becoming loose.

[0050] In some embodiments, the pressing assembly 204 includes a pressure roller 2041, a bearing 2042, and an insulating ring 2043. The pressure roller 2041 is connected to the connecting member 202 via the bearing 2042, and the insulating ring 2043 is sleeved on the outer periphery of the pressure roller 2041. When the plate 3 moves on the conveyor belt 101 and passes under the pressure roller 2041, the pressure roller 2041, under the combined action of its own weight and the pressure applied by the connecting member 202, comes into close contact with the surface of the plate 3. As the conveyor belt 101 moves, relative friction is generated between the plate 3 and the pressure roller 2041, thereby driving the pressure roller 2041 to rotate. The rotation of the pressure roller 2041 provides continuous and stable pressure to the plate 3, ensuring that the plate 3 remains flat during the conveying process and does not warp or shift. The insulating ring 2043 is fitted around the outer periphery of the pressure roller 2041. During the transport of the circuit board 3, if the circuit board 3 is statically charged or there is electrical interference in the transport environment, the insulating ring 2043 can block the conduction path of current between the pressure roller 2041 and the circuit board 3. It acts like an electrical barrier, isolating the pressure roller 2041 from external electrical influences and protecting the circuit board 3 from electrical damage.

[0051] The insulating ring 2043 can be made of antistatic acrylic rubber or other insulating materials, and it directly contacts the circuit board 3, requiring electrostatic dissipation. From the perspective of electrostatic generation and conduction, circuit boards are prone to generating static electricity due to friction during production and transportation. When a static-laden circuit board enters the conveyor and comes into contact with the antistatic acrylic rubber insulating ring 2043 on the pressure roller 2041, the special electrical properties of the antistatic acrylic rubber mean that it does not completely prevent the flow of charge like ordinary insulating materials, but rather provides a slow release channel for the static electricity. The conductive particles or antistatic additives inside form a conductive network, allowing the static electricity on the circuit board to gradually dissipate into the surrounding environment along this network, rather than accumulating at the contact point between the circuit board and the pressure roller 2041, thus avoiding further accumulation of static electricity and the potential electrostatic discharge phenomenon.

[0052] Optionally, the pressure roller 2041 includes a concentrically arranged outer roller portion 20412 and a support portion 20413. The radius of the outer roller portion 20412 is larger than the radius of the support portion 20413, and the thickness of the outer roller portion 20412 is adapted to the process edge, allowing the pressure roller 2041 to apply pressure more precisely when in contact with the circuit board 3. This design avoids insufficient or excessive pressure on the edge of the circuit board 3 due to the excessive thickness of the pressure roller 2041, ensuring that the circuit board 3 receives uniform pressure on the conveyor belt 101 and greatly improving the flatness of the circuit board 3 during transport. For some electronic product circuit boards 3 with extremely high flatness requirements, such as high-precision printed circuit boards, this precise pressure can effectively reduce production defects caused by unevenness of the circuit board 3 and improve product quality. Moreover, since the outer roller portion 20412 can be designed to be 3mm smaller than the process edge, it can be compatible with most product requirements.

[0053] In addition, a circular groove 20414 is provided on the outer periphery of the outer wheel portion 20412, and the insulating ring 2043 is installed in the circular groove 20414. The circular groove 20414 provides a precise installation position and stable support for the insulating ring 2043. During the rotation of the pressure roller 2041, the insulating ring 2043 rotates together with the outer wheel portion 20412, and at the same time generates relative sliding friction with the plate 3. Due to the constraint effect of the circular groove 20414, the insulating ring 2043 can always remain in the correct position without displacement or falling off, ensuring stable contact with the plate 3.

[0054] In practical circuit board conveying scenarios, the rotatable pressure roller 2041, with its unique design and working mechanism, achieves effective compatibility and stable conveying of circuit boards of different thicknesses. The structural design of the rotatable pressure roller 2041 gives it high flexibility, enabling it to adapt to circuit boards with thicknesses ranging from 0.5mm to 8mm. When circuit boards of different thicknesses are about to enter between the conveyor belt 101 and the pressure roller 2041, the initial position of the pressure roller 2041 is fixed, with a certain preload provided by a torsion spring to maintain it at a specific height. For thinner circuit boards, such as those with a substrate thickness of 0.5mm, the lifting force exerted on the pressure roller 2041 is relatively small when entering between the conveyor belt 101 and the pressure roller 2041 due to the thinness of the circuit board itself. At this time, under the preload of the torsion spring, the pressure roller 2041 slightly presses down to make close contact with the surface of the circuit board. This relatively small downward pressure ensures friction with the circuit board, allowing the circuit board to move smoothly with the conveyor belt 101.

[0055] For thicker boards, such as substrates up to 6mm thick, when they enter between the conveyor belt 101 and the pressure roller 2041, a significant lifting force is generated on the pressure roller 2041. This lifting force overcomes part of the preload of the torsion spring, causing the pressure roller 2041 to move upward a certain distance along its rotation axis 20422. During this process, the torsion spring is compressed, increasing its elastic potential energy. As the pressure roller 2041 moves upward, its contact position with the board changes, but it always maintains a tight fit with the board surface. Furthermore, due to the compression of the torsion spring, the downward pressure generated on the pressure roller 2041 increases, thereby increasing the friction between the pressure roller 2041 and the board, ensuring stable conveying even for thick boards.

[0056] It is worth mentioning that the connector 202 is also equipped with a grounding hole 2022. During the conveying process of the board 3, due to friction between the board 3 and components such as the conveyor belt 101 and pressure roller 2041, as well as electromagnetic interference in the surrounding environment, static charge will inevitably accumulate on the surface of the board 3. If this static charge is not released in time, it will cause electrostatic discharge when it accumulates to a certain level. The high voltage and strong current pulse generated during electrostatic discharge can break down the insulation layer of electronic devices in a very short time, damaging internal integrated circuits, transistors and other precision components, causing the board 3 to malfunction. The connector 202 plays a key role in connecting and transmitting power in the conveying device, and it is in close contact with components such as the pressure roller 2041 and the conveyor belt 101. When the board 3 carrying static electricity passes through the pressure roller 2041, the static electricity will be conducted to the connector 202 through the pressure roller 2041. The grounding hole 2022 provided on the connector 202 provides a low-impedance release channel for the static electricity. The static charge will be quickly conducted along the metal material of the connector 202 to the grounding hole 2022, and then safely conducted to the ground through the grounding wire connected to the grounding hole 2022, thereby avoiding the accumulation and discharge of static electricity on the board 3 and related components.

[0057] On the other hand, an optical inspection device is also provided, including the board conveying device described above.

[0058] In the description herein, it should be understood that the terms "upper," "lower," "left," "right," and other orientations or positional relationships are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used merely for descriptive distinction and have no special meaning.

[0059] In the description of this specification, references to terms such as "an embodiment," "example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0060] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style of the specification is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0061] The technical principles of this application have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of this application and should not be construed as limiting the scope of protection of this application in any way. Based on this explanation, those skilled in the art can readily conceive of other specific embodiments of this application without inventive effort, and these embodiments will all fall within the scope of protection of this application.

Claims

1. A board conveying device, characterized in that, include: The conveying mechanism (1) and the pressure plate mechanism (2) are installed at one or both ends of the conveying mechanism (1). The pressure plate mechanism (2) includes a base (201), a connector (202), an elastic element (203), a pressing assembly (204), and an adjusting element (205). One end of the connector (202) is movably connected to the base (201), and the other end of the connector (202) is connected to the pressing assembly (204). The pressing assembly (204) is located above the conveyor belt (101) of the conveying mechanism (1). The elastic element (203) is disposed between the adjusting element (205) and the connecting element (202). The adjusting element (205) is movably disposed on the base (201) and can move toward or away from the elastic element (203).

2. The board conveying device according to claim 1, characterized in that, The connector (202) is rotatably mounted on the base (201) via a rotating shaft (206).

3. The board conveying device according to claim 2, characterized in that, The adjusting member (205) includes a main body (2051) and an anti-detachment part (2052). The main body (2051) is connected to the base (201), and the anti-detachment part (2052) is opposite to at least one end of the rotating shaft (206).

4. The board conveying device according to claim 3, characterized in that, The elastic element (203) is a torsion spring, which includes a helical tube (2031), a first torsion arm (2032) and a second torsion arm (2033). The helical tube (2031) is sleeved on the rotating shaft (206). The first torsion arm (2032) contacts the main body (2051), and the second torsion arm (2033) contacts the connector (202).

5. The board conveying device according to claim 3, characterized in that, The adjusting member (205) is mounted on the base (201) via an adjustable fixing member (207). The main body (2051) is provided with an adjusting hole (2053), and the base (201) is provided with a locking hole (2011). The adjustable fixing member (207) is locked in the locking hole (2011) via the adjusting hole (2053), and the adjustable fixing member (207) can be locked in different positions of the adjusting hole (2053).

6. The board conveying device according to any one of claims 1-5, characterized in that, The connector (202) is provided with a through hole (2021), and a fastener (208) is provided at the through hole (2021). The bottom end of the fastener (208) can pass through the through hole (2021) and contact the base (201).

7. The card conveying device according to any one of claims 1-5, characterized in that, The pressing assembly (204) includes a pressure roller (2041), a bearing (2042), and an insulating ring (2043). The pressure roller (2041) is connected to the connector (202) via the bearing (2042), and the insulating ring (2043) is sleeved on the outer periphery of the pressure roller (2041).

8. The board conveying device according to claim 7, characterized in that, The pressure roller (2041) includes an outer wheel portion (20412) and a support portion (20413) arranged concentrically. The radius of the outer wheel portion (20412) is larger than the radius of the support portion (20413). A circular groove (20414) is provided on the outer periphery of the outer wheel portion (20412), and the insulating ring (2043) is installed in the circular groove (20414).

9. The board conveying device according to any one of claims 1-5, characterized in that, The connector (202) is also provided with a grounding hole (2022).

10. An optical inspection device, characterized in that, Includes the board conveying device according to any one of claims 1-9.

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