Accurate PCB feeding device

Abstract

The application relates to a PCB precise feeding device and belongs to the field of PCB processing equipment. The device comprises a base, a conveying mechanism, a blocking mechanism and a push plate mechanism. The upper surface of the base is horizontally formed as a first mounting surface, and the right side of the first mounting surface is downwardly inclined to form a second mounting surface. The conveying mechanism comprises a mounting groove arranged on the second mounting surface and a conveying assembly arranged in the mounting groove. The conveying assembly is formed with a conveying surface with a conveying direction from front to back. The right end of the second mounting surface is further provided with a limiting block, and the left side wall of the limiting block is formed as a blocking surface. The blocking mechanism comprises a baffle arranged along the left-right direction and perpendicular to the second mounting surface. The upper end of the baffle extends above the conveying surface. The push plate mechanism is arranged on the left side of the conveying mechanism and comprises a storage frame arranged on the first mounting surface and used for storing PCBs and a push plate assembly used for pushing the PCBs in the storage frame to the conveying surface. The application can effectively improve the positioning efficiency of the PCBs, thereby improving the feeding efficiency.

Description

Technical Field

[0001] This invention relates to the field of PCB processing equipment, and in particular to a precise PCB feeding device. Background Technology

[0002] In the PCB manufacturing process, the feeding stage is a crucial step in the orderly and precise delivery of bare boards or boards to be processed to downstream processes (such as screen printing, mounting, and testing). The performance of the feeding device directly affects the efficiency, yield, and automation level of the production line.

[0003] Traditional PCB loading devices often employ mechanical levers or pneumatic pushers for PCB positioning. However, these methods are time-consuming in practice. Specifically, after the PCB is conveyed into position, mechanical or pneumatic mechanisms gradually push the PCB along the conveyor until it aligns with the limiting device. Because the speed is limited by the device's response time and safety requirements, the PCB alignment is slow and must be performed in stages to avoid impact and damage. Therefore, the overall alignment process is inefficient, resulting in low loading efficiency.

[0004] Based on this, the present invention provides a PCB precision feeding device to improve PCB positioning speed, thereby achieving the goal of improving feeding efficiency. Summary of the Invention

[0005] Based on this, the present invention provides a PCB precision loading device, including a base, a conveying mechanism, a blocking mechanism, and a pusher mechanism. The upper surface of the base is horizontal, forming a first mounting surface. The right side of the first mounting surface slopes downward, forming a second mounting surface with a left-high-right-low slope. The conveying mechanism includes a mounting groove formed in the second mounting surface and a conveying component disposed in the mounting groove. The conveying component forms a conveying surface with a forward-backward conveying direction. The conveying surface is located above and parallel to the second mounting surface. A limit block is also provided at the right end of the second mounting surface. The left sidewall of the limit block forms a blocking surface, which is arranged along the forward-backward direction and perpendicular to the second mounting surface. The blocking mechanism includes a baffle arranged along the left-right direction and perpendicular to the second mounting surface. The baffle is fixedly disposed in the mounting groove and located at the downstream end of the conveying surface, and the upper end of the baffle extends above the conveying surface. The pusher mechanism is located to the left of the conveying mechanism and includes a storage frame for storing PCBs disposed on the first mounting surface and a pusher assembly for pushing the PCBs in the storage frame onto the conveying surface.

[0006] In this invention, the storage frame of the pusher mechanism is used to store PCBs to be loaded, and the pusher assembly is used to push the PCBs stored in the storage frame one by one onto the conveying surface of the conveying mechanism. After the PCB is pushed onto the conveying surface, because the conveying surface is inclined, the PCB will slide down to its right edge and abut against the blocking surface of the limiting block during the conveying process. At this time, the position of the PCB in the left and right direction is fixed. Then, as the conveying surface continues to convey the PCB, it will be conveyed to its rear edge and abut against the baffle. At this time, the position of the PCB in the front, back, left and right directions is fixed. The loading operation is completed, and the production equipment can grab the PCB at this position to continue to complete the subsequent processing operations.

[0007] As can be seen, by setting the conveyor surface to be inclined, the present invention can complete the positioning operation of the PCB during the conveying process of the PCB, without the need for an additional positioning structure. This can effectively improve the positioning efficiency of the PCB, thereby improving the feeding efficiency. At the same time, eliminating the positioning structure can also simplify the feeding device and reduce the production cost of the feeding device.

[0008] Furthermore, a roller assembly is provided on the blocking surface. The roller assembly includes several rollers arranged at equal intervals along the front-back direction. The rollers are rotatably mounted on the blocking surface, and the axis of the rollers is perpendicular to the mounting surface. The lower end of the rollers extends below the conveying surface.

[0009] In this invention, a roller assembly is provided on the blocking surface. When the PCB is conveyed on the conveying surface, it will slide down and abut against the roller. The passive rotation of the roller can reduce the friction between the PCB and the blocking surface, ensuring the smooth movement of the PCB on the conveying surface and avoiding frictional damage between the PCB and the blocking surface.

[0010] In this invention, the roller can be rotatably mounted on the blocking surface via a bearing structure.

[0011] Furthermore, the pusher assembly includes a first conveyor roller group, which includes a plurality of first conveyor rollers arranged in a left-right direction. The first conveyor rollers are rotatably disposed on the first mounting surface, and the axis of the first conveyor rollers is arranged in a front-back direction. The top ends of the first conveyor rollers are located on the same horizontal plane, forming a bearing surface. The storage frame includes a first limiting plate and a second limiting plate disposed on the first mounting surface. The bottom end of the first limiting plate is fixedly disposed at the junction of the first mounting surface and the second mounting surface, and the first limiting plate is inclined with its top end tilted to the left. The second limiting plate is located on the left side of the pusher assembly and is disposed parallel to the first limiting plate. The lower end of the first limiting plate has an opening for the PCB to pass through. The horizontal height of the top end of the opening is higher than the horizontal height of the bearing surface, and the height difference is greater than the thickness of one PCB and less than the thickness of two PCBs.

[0012] In this invention, a first limiting plate and a second limiting plate are combined to form a storage frame. The space between the first and second limiting plates is used to accommodate PCBs to be loaded. The distance between the first and second limiting plates needs to be the same as or slightly larger than the width of the PCB in the left-right direction, for example, 2-6 mm larger than the width of the PCB in the left-right direction. The PCB placed in the storage frame is supported by a first conveying roller group. By rotating the first conveying rollers, the PCB can be conveyed. During this process, the PCB will pass through the opening at the lower end of the first limiting plate and move above the conveying surface. After the PCB leaves the first conveying roller group, it will fall onto the conveying surface below it and be conveyed by the conveying surface, thereby realizing the pushing of PCBs one by one. Since the second limiting plate is inclined, the left end of the PCB located in the storage frame will be supported by the second limiting plate. It can be seen that during the process of the first conveying roller group pushing the PCB, the presence of the second limiting plate can reduce the pressure of the PCB above it on the PCB being conveyed by the first conveying roller group, so that the PCB can be pushed more easily to ensure that the PCB is smoothly pushed onto the conveying surface.

[0013] In this invention, the first conveying roller can be rotatably mounted on the first mounting surface via a bearing structure, and they are interconnected by a chain structure to maintain synchronous rotation under the drive of a motor, thereby achieving smooth pushing of the PCB.

[0014] In this invention, the height difference between the upper end of the lower end of the window of the first limiting plate and the bearing surface is greater than the thickness of one PCB and less than the thickness of two PCBs, which can ensure that there will be no situation where two PCBs are pushed out at the same time.

[0015] Furthermore, the angle between the first limiting plate and the horizontal plane is 40°-50°.

[0016] Furthermore, side plates are fixedly provided at both the front and rear ends of the left side wall of the first limiting plate. The side plates are arranged along the left and right direction and perpendicular to the first mounting surface. The left end of the side plate is located on the same plane parallel to the first limiting plate, forming an abutment surface. The right side wall of the second limiting plate abuts against the abutment surface.

[0017] In this invention, the side plates at both ends of the first limiting plate, together with the first limiting plate and the second limiting plate, form a enclosure structure, which can limit the PCB in the storage frame and prevent the PCB stacked in the storage frame from tipping over.

[0018] Furthermore, a horizontal support plate is fixedly installed at the bottom of the right side wall of the second limiting plate. The support plate is slidably mounted on the first mounting surface via a guide rail. The horizontal height of the upper surface of the support plate is lower than the horizontal height of the bearing surface. A clearance groove is provided on the support plate corresponding to the first conveying roller group to avoid the first conveying roller group. A locking mechanism for fixing the limiting plate is also provided on the side plate corresponding to the second limiting plate.

[0019] In this invention, the support plate at the bottom of the second limiting plate is used to stack PCBs. After the PCBs are stacked on it, the support plate can be moved to the storage frame by moving it to the right, so that the PCBs are supported by the first conveying roller group. When the support plate moves to the point where it abuts the second limiting plate, it moves into place. At this time, the locking mechanism can lock the second limiting plate, so that the second limiting plate and the side plate are relatively fixed.

[0020] In addition, in this invention, the horizontal height of the upper surface of the support plate is lower than the horizontal height of the bearing surface. Therefore, during the process of the support plate moving to the right, the PCB on it will be pushed onto the bearing surface by the first conveyor roller after it comes into contact with the first conveyor roller. At this time, the PCB will leave the support plate, which can effectively reduce the friction force on the PCB when it is pushed out by the pusher mechanism, thereby making it easier for the PCB to be pushed out, so as to reduce the power demand of the first conveyor roller.

[0021] Furthermore, the locking mechanism includes mounting plates disposed at the front and rear ends of the second limiting plate. An insert plate is fixedly disposed on the mounting plate. The insert plate is horizontally disposed and has a first insertion hole that penetrates vertically through it. A connecting plate is disposed on the outer side wall of the side plate corresponding to the insert plate. The connecting plate is attached to the lower surface of the insert plate, and a second insertion hole aligned longitudinally is disposed on the connecting plate corresponding to the first insertion hole.

[0022] In this invention, after the second limiting plate moves to the right and abuts against the abutting surface, the insert plate on it will fit against the upper surface of the connecting plate. At this time, the second insertion hole and the second insertion hole are aligned longitudinally. By inserting the pin, the second limiting plate and the support plate on it can be fixed.

[0023] Furthermore, a handle is also provided on the left side wall of the second limiting plate.

[0024] In this invention, the handle on the second limiting plate is used to facilitate pushing and pulling the second limiting plate.

[0025] Furthermore, the conveying assembly includes a plurality of second conveying rollers arranged at equal intervals along the front-back direction. The second conveying rollers are rotatably mounted in the mounting groove, and the axis of the second conveying rollers is perpendicular to the blocking surface. The upper ends of the sidewalls of the second conveying rollers are located on the same inclined plane to form a conveying surface.

[0026] In this invention, the first conveying roller can be rotatably mounted on the first mounting surface via a bearing structure, and they are interconnected by a chain structure to maintain synchronous rotation under the drive of a motor, thereby achieving smooth and uniform conveying of the PCB.

[0027] Furthermore, the angle between the second mounting surface and the horizontal plane is 15°-30°.

[0028] The principles and effects of the present invention will be further explained below with reference to the above technical solutions and accompanying drawings: This invention, by tilting the conveyor surface, enables the positioning of the PCB during its transport without the need for an additional positioning structure. This effectively improves the positioning efficiency of the PCB, thereby increasing the loading efficiency. Furthermore, eliminating the positioning structure simplifies the loading device and reduces its production cost. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the PCB precision feeding device according to an embodiment of the present invention; Figure 2 This is a cross-sectional structural diagram of the PCB precision feeding device according to an embodiment of the present invention; Figure 3 for Figure 2 A magnified view of a portion of the image; Figure 4 This is a top view of the PCB precision feeding device according to an embodiment of the present invention; Figure 5 This is a cross-sectional structural diagram of the PCB precision feeding device according to an embodiment of the present invention when the support plate moves to the right.

[0030] Figure Labels

[0031] 1-Base, 11-First mounting surface, 111-Guide rail, 12-Second mounting surface, 121-Mounting groove, 2-Limiting block, 21-Blocking surface, 22-Roller, 31-First limiting plate, 311-Window, 32-Second limiting plate, 321-Mounting plate, 322-Insertion plate, 323-Handle, 33-Side plate, 331-Connecting plate, 34-Support plate, 341-Void groove, 4-Pin, 5-Second conveying roller, 6-Baffle, 7-First conveying roller. Detailed Implementation

[0032] To facilitate understanding by those skilled in the art, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. In this description, directional terms such as up, down, left, and right are used interchangeably with reference to the accompanying drawings. Figure 1 For reference: like Figure 1-5 A PCB precision feeding device includes a base 1, a conveying mechanism, a blocking mechanism, and a pushing mechanism. The upper surface of the base 1 is horizontal, forming a first mounting surface 11. The right side of the first mounting surface 11 is inclined downwards, forming a second mounting surface 12 with a left-high-right-low tilt. The conveying mechanism includes a mounting groove 121 formed in the second mounting surface 12 and a conveying component disposed in the mounting groove 121. The conveying component forms a conveying surface with a forward-backward conveying direction. The conveying surface is located above and parallel to the second mounting surface 12. A limit block 2 is also provided at the right end of the second mounting surface 12. The left sidewall of the limit block 2 forms a blocking surface 21, which is arranged along the forward-backward direction and perpendicular to the second mounting surface 12. The blocking mechanism includes a baffle 6 arranged along the left-right direction and perpendicular to the second mounting surface 12. The baffle 6 is fixedly disposed in the mounting groove 121 and located at the downstream end of the conveying surface, and the upper end of the baffle 6 extends above the conveying surface. The pusher mechanism is located on the left side of the conveying mechanism and includes a storage frame for storing PCBs disposed on the first mounting surface 11, and a pusher assembly for pushing the PCBs in the storage frame onto the conveying surface.

[0033] In this invention, the storage frame of the pusher mechanism is used to store PCBs to be loaded, and the pusher assembly is used to push the PCBs stored in the storage frame one by one onto the conveying surface of the conveying mechanism. After the PCB is pushed onto the conveying surface, since the conveying surface is inclined, the PCB will slide down to its right edge and abut against the blocking surface 21 of the limiting block 2 during the conveying process. At this time, the position of the PCB in the left and right directions is fixed. Then, as the conveying surface continues to convey the PCB, it will be conveyed to its rear edge and abut against the baffle 6. At this time, the position of the PCB in the front, back, left and right directions is fixed. The loading operation is completed, and the production equipment can grab the PCB at this position to continue to complete the subsequent processing operation.

[0034] As can be seen, by setting the conveyor surface to be inclined, the present invention can complete the positioning operation of the PCB during the conveying process of the PCB, without the need for an additional positioning structure. This can effectively improve the positioning efficiency of the PCB, thereby improving the feeding efficiency. At the same time, eliminating the positioning structure can also simplify the feeding device and reduce the production cost of the feeding device.

[0035] In one embodiment, a set of rollers 22 is provided on the blocking surface 21. The set of rollers 22 includes a plurality of rollers 22 arranged at equal intervals along the front-back direction. The rollers 22 are rotatably mounted on the blocking surface 21, and the axis of the rollers 22 is perpendicular to the mounting surface. The lower end of the rollers 22 extends below the conveying surface.

[0036] In this embodiment, a set of rollers 22 is provided on the blocking surface 21. When the PCB is conveyed on the conveying surface, it will slide down and abut against the rollers 22. The passive rotation of the rollers 22 can reduce the friction between the PCB and the blocking surface 21, which can ensure the smooth movement of the PCB on the conveying surface and avoid friction damage between the PCB and the blocking surface 21.

[0037] In this embodiment, the roller 22 can be rotatably mounted on the blocking surface 21 via a bearing structure.

[0038] In one embodiment, the pusher assembly includes a first set of conveying rollers 7, which includes a plurality of first conveying rollers 7 arranged in a left-right direction. The first conveying rollers 7 are rotatably disposed on the first mounting surface 11, and the axis of the first conveying rollers 7 is arranged in a front-back direction. The top ends of the first conveying rollers 7 are located on the same horizontal plane, forming a bearing surface. The storage frame includes a first limiting plate 31 and a second limiting plate 32 disposed on the first mounting surface 11. The bottom end of the first limiting plate 31 is fixedly disposed at the junction of the first mounting surface 11 and the second mounting surface 12, and the first limiting plate 31 is inclined with its top end tilted to the left. The second limiting plate 32 is located on the left side of the pusher assembly and is disposed parallel to the first limiting plate 31. The lower end of the first limiting plate 31 has an opening 311 for the PCB to pass through. The horizontal height of the top end of the opening 311 is higher than the horizontal height of the bearing surface, and the height difference is greater than the thickness of one PCB and less than the thickness of two PCBs.

[0039] In this embodiment, the first limiting plate 31 and the second limiting plate 32 are combined to form a storage frame. The space between the first limiting plate 31 and the second limiting plate 32 is used to accommodate the PCB to be loaded. The distance between the first limiting plate 31 and the second limiting plate 32 needs to be the same as or slightly larger than the width of the PCB in the left-right direction, for example, 2-6mm larger than the width of the PCB in the left-right direction. The PCB placed in the storage frame is supported by the first conveying roller 7 group. The PCB can be conveyed by the rotation of the first conveying roller 7. During this process, the PCB will pass through the opening 311 at the lower end of the first limiting plate 31 and move to the top of the conveying surface. After the PCB leaves the first conveying roller 7 group, it will fall onto the conveying surface below it and be conveyed by the conveying surface, thereby realizing the pushing of the PCB piece by piece. Since the second limiting plate 32 is inclined, the left end of the PCB located in the storage frame will be supported by the second limiting plate 32. It can be seen that during the process of the first conveying roller 7 group pushing the PCB, the presence of the second limiting plate 32 can reduce the pressure of the PCB above it on the PCB being conveyed by the first conveying roller 7 group, so that the PCB can be pushed more easily to ensure that the PCB is pushed smoothly onto the conveying surface.

[0040] In this embodiment, the first conveying roller 7 can be rotatably mounted on the first mounting surface 11 via a bearing structure, and they are connected to each other via a chain structure to maintain synchronous rotation under the drive of the motor, thereby achieving smooth pushing of the PCB.

[0041] In this embodiment, the height difference between the upper end of the lower end of the window 311 of the first limiting plate 31 and the bearing surface is greater than the thickness of one PCB and less than the thickness of two PCBs, which can ensure that there will be no situation where two PCBs are pushed out at the same time.

[0042] In one embodiment, the angle between the first limiting plate 31 and the horizontal plane is 40°-50°.

[0043] In one embodiment, side plates 33 are fixedly provided at both the front and rear ends of the left side wall of the first limiting plate 31. The side plates 33 are arranged along the left and right direction and perpendicular to the first mounting surface 11. The left end of the side plate 33 is located on the same plane parallel to the first limiting plate 31, forming an abutment surface. The right side wall of the second limiting plate 32 abuts against the abutment surface.

[0044] In this embodiment, the side plates 33 at both ends of the first limiting plate 31, together with the first limiting plate 31 and the second limiting plate 32, form a enclosure structure, which can limit the PCB in the storage frame and prevent the PCB stacked in the storage frame from tipping over.

[0045] In one embodiment, a horizontal support plate 34 is fixedly provided at the bottom of the right side wall of the second limiting plate 32. The support plate 34 is slidably disposed on the first mounting surface 11 via a guide rail 111. The horizontal height of the upper surface of the support plate 34 is lower than the horizontal height of the bearing surface. A clearance groove 341 for avoiding the first conveying roller group 7 is provided on the support plate 34 corresponding to the first conveying roller group 7. A locking mechanism for fixing the limiting plate is also provided on the side plate 33 corresponding to the second limiting plate 32.

[0046] In this embodiment, the support plate 34 at the bottom of the second limiting plate 32 is used to stack PCBs. After the PCBs are stacked on it, the support plate 34 can be moved to the right to move the PCBs into the storage frame, so that the PCBs are supported by the first conveying rollers 7. When the second limiting plate 32 abuts against the contact surface, the support plate 34 moves into place. At this time, the locking mechanism can lock the second limiting plate 32, so that the second limiting plate 32 and the side plate 33 are relatively fixed.

[0047] In addition, in this embodiment, the horizontal height of the upper surface of the support plate 34 is lower than the horizontal height of the bearing surface. Therefore, during the process of the support plate 34 moving to the right, the PCB on it will be pushed onto the bearing surface by the first conveyor roller 7 after it comes into contact with the first conveyor roller 7. At this time, the PCB will leave the support plate 34, which can effectively reduce the friction force on the PCB when it is pushed out by the pusher mechanism, thereby making it easier for the PCB to be pushed out, so as to reduce the power demand of the first conveyor roller 7.

[0048] In one embodiment, the locking mechanism includes mounting plates 321 disposed at the front and rear ends of the second limiting plate 32. An insert plate 322 is fixedly disposed on the mounting plate 321. The insert plate 322 is horizontally disposed and has a first insertion hole that penetrates vertically therethrough. A connecting plate 331 is disposed on the outer side wall of the side plate 33 corresponding to the insert plate 322. The connecting plate 331 is attached to the lower surface of the insert plate 322, and a second insertion hole that is aligned longitudinally is disposed on the connecting plate 331 corresponding to the first insertion hole.

[0049] In this embodiment, after the second limiting plate 32 moves to the right and abuts against the abutting surface, the insert plate 322 on it will fit against the upper surface of the connecting plate 331. At this time, the second insertion hole and the second insertion hole are aligned longitudinally. By inserting the pin 4, the second limiting plate 32 and the support plate 34 on it can be fixed.

[0050] In one embodiment, a handle 323 is also provided on the left side wall of the second limiting plate 32.

[0051] In this embodiment, the handle 323 on the second limiting plate 32 is used to facilitate pushing and pulling the second limiting plate 32.

[0052] In one embodiment, the conveying assembly includes a plurality of second conveying rollers 5 arranged at equal intervals along the front-back direction. The second conveying rollers 5 are rotatably mounted in the mounting groove 121, and the axis of the second conveying rollers 5 is perpendicular to the blocking surface 21. The upper ends of the sidewalls of the second conveying rollers 5 are located on the same inclined plane to form a conveying surface.

[0053] In this embodiment, the first conveying roller 7 can be rotatably mounted on the first mounting surface 11 via a bearing structure. They are connected to each other via a chain structure to maintain synchronous rotation under the drive of a motor, thereby achieving smooth and uniform conveying of the PCB.

[0054] In one embodiment, the angle between the second mounting surface 12 and the horizontal plane is 15°-30°.

[0055] The above embodiments merely illustrate several implementation methods of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A PCB precision feeding device, characterized in that, include The base has a horizontal upper surface that forms a first mounting surface. The right side of the first mounting surface slopes downwards, forming a left-high-right-low slope, thus forming a second mounting surface. The conveying mechanism includes a mounting groove formed on the second mounting surface and a conveying component disposed in the mounting groove. The conveying component forms a conveying surface with a conveying direction from front to back. The conveying surface is located above the second mounting surface and parallel to the second mounting surface. A limit block is also provided at the right end of the second mounting surface. The left sidewall of the limit block forms a blocking surface. The blocking surface is arranged along the front-back direction and perpendicular to the second mounting surface. The blocking mechanism includes a baffle that is arranged along the left-right direction and perpendicular to the second mounting surface. The baffle is fixedly arranged in the mounting groove and located at the downstream end of the conveying surface, and the upper end of the baffle extends above the conveying surface. The pusher mechanism, located on the left side of the conveying mechanism, includes a storage frame for storing PCBs disposed on the first mounting surface, and a pusher assembly for pushing the PCBs in the storage frame onto the conveying surface. The pusher assembly includes a first conveyor roller group, which includes a plurality of first conveyor rollers arranged in a left-right direction. The first conveyor rollers are rotatably mounted on the first mounting surface, and the axis of the first conveyor rollers is arranged in a front-back direction. The top ends of the first conveyor rollers are located on the same horizontal plane, forming a bearing surface. The storage frame includes a first limiting plate and a second limiting plate disposed on the first mounting surface. The bottom end of the first limiting plate is fixedly disposed at the junction of the first mounting surface and the second mounting surface, and the first limiting plate is inclined with its top end tilted to the left. The second limiting plate is located on the left side of the pusher assembly and is arranged parallel to the first limiting plate. The lower end of the first limiting plate has an opening for the PCB to pass through. The horizontal height of the top end of the opening is higher than the horizontal height of the bearing surface, and the height difference is greater than the thickness of one PCB and less than the thickness of two PCBs. Side plates are fixedly provided at both the front and rear ends of the left side wall of the first limiting plate. The side plates are arranged along the left and right direction and perpendicular to the first mounting surface. The left end of the side plate is located on the same plane parallel to the first limiting plate, forming an abutment surface. The right side wall of the second limiting plate abuts against the abutment surface. A horizontal support plate is fixedly installed at the bottom of the right side wall of the second limiting plate. The support plate is slidably mounted on the first mounting surface via a guide rail. The horizontal height of the upper surface of the support plate is lower than the horizontal height of the bearing surface. A clearance groove is provided on the support plate corresponding to the first conveying roller group to avoid the first conveying roller group. A locking mechanism for fixing the second limiting plate is also provided on the side plate corresponding to the second limiting plate.

2. The PCB precision feeding device according to claim 1, characterized in that, A roller assembly is provided on the blocking surface. The roller assembly includes several rollers arranged at equal intervals along the front-back direction. The rollers are rotatably mounted on the blocking surface, and the axis of the rollers is perpendicular to the second mounting surface. The lower end of the rollers extends below the conveying surface.

3. The PCB precision feeding device according to claim 1, characterized in that, The angle between the first limiting plate and the horizontal plane is 40°-50°.

4. The PCB precision feeding device according to claim 1, characterized in that, The locking mechanism includes mounting plates disposed at the front and rear ends of the second limiting plate. An insert plate is fixedly disposed on the mounting plate. The insert plate is horizontally disposed and has a first insertion hole that penetrates vertically through it. A connecting plate is disposed on the outer side wall of the side plate corresponding to the insert plate. The connecting plate is attached to the lower surface of the insert plate, and a second insertion hole is disposed on the connecting plate corresponding to the first insertion hole and aligned with its longitudinal direction.

5. The PCB precision feeding device according to claim 1, characterized in that, A handle is also provided on the left side wall of the second limiting plate.

6. The PCB precision feeding device according to claim 1, characterized in that, The conveying assembly includes a plurality of second conveying rollers arranged at equal intervals along the front-back direction. The second conveying rollers are rotatably mounted in the mounting groove, and the axis of the second conveying rollers is perpendicular to the blocking surface. The upper ends of the sidewalls of the second conveying rollers are located on the same inclined plane, forming a conveying surface.

7. The PCB precision feeding device according to claim 1, characterized in that, The angle between the second mounting surface and the horizontal plane is 15°-30°.

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