PCB accurate feeding device

Abstract

The invention relates to a PCB accurate feeding device, and belongs to the field of PCB processing equipment, the PCB accurate feeding device comprises a base, a conveying mechanism, a blocking mechanism and a push plate mechanism, the upper surface of the base is horizontal to form a first mounting surface, and the right side of the first mounting surface inclines downwards to form a second mounting surface; the conveying mechanism comprises a mounting groove formed in the second mounting surface and a conveying assembly arranged in the mounting groove, a conveying surface with the conveying direction from front to back is formed on the conveying assembly, a limiting block is further arranged at the right end of the second mounting surface, and a blocking surface is formed on the left side wall of the limiting block; the blocking mechanism comprises a baffle arranged in the left-right direction and perpendicular to the second mounting face, and the upper end of the baffle extends to the position above the conveying face. The board pushing mechanism is located on the left side of the conveying mechanism and comprises a storage frame arranged on the first installation face and used for storing the PCBs and a board pushing assembly used for pushing the PCBs in the storage frame to the conveying face. According to the invention, the positioning efficiency of the PCB can be effectively improved, so that the improvement of the feeding efficiency is realized.

Description

Technical Field

[0001] The present invention relates to the field of PCB processing equipment, and in particular to a PCB precision feeding device. Background Art

[0002] In the PCB production process, loading is a key step in transporting bare boards or unprocessed boards to downstream processes (such as screen printing, mounting, testing, etc.) in an orderly and precise manner. The performance of the loading device directly affects the efficiency, yield rate and degree of automation of the production line.

[0003] Traditional loading devices often use centering structures such as mechanical levers and pneumatic push rods to achieve PCB positioning. However, in actual use, the centering process of traditional centering structures using mechanical levers and pneumatic push rods often takes a long time. Specifically, after the PCB is transported into position by the conveying structure, this type of device relies on a mechanical or pneumatic mechanism to gradually push the PCB sheet on the conveying structure until it is aligned with the limit device. Because its movement speed is limited by the device's own response speed and safety requirements, the centering action during the loading process is slow and must be carried out step by step to avoid impact and damage to the PCB. Therefore, the entire centering process is inefficient, which leads to low loading efficiency.

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

[0005] Based on this, the present invention provides a PCB precision loading device, comprising a base, a conveying mechanism, a blocking mechanism, and a push plate mechanism. The upper surface of the base is horizontal, forming a first mounting surface. The right side of the first mounting surface is tilted downward, with the left side higher and the right side lower, forming a second mounting surface. The conveying mechanism includes a mounting slot defined in the second mounting surface, and a conveying assembly disposed within the mounting slot. The conveying assembly forms a conveying surface that conveys from front to back, located above and parallel to the second mounting surface. A limit block is disposed at the right end of the second mounting surface, and the left sidewall of the limit block forms a blocking surface. The blocking surface is disposed in the front-to-back direction and perpendicular to the second mounting surface. The blocking mechanism includes a baffle disposed in the left-to-right direction and perpendicular to the second mounting surface. The baffle is fixedly disposed in the mounting slot and located at the downstream end of the conveying surface, with the upper end of the baffle extending above the conveying surface. The push plate mechanism is located on the left side of the conveying mechanism and includes a storage frame disposed on the first mounting surface for storing PCBs, and a push plate assembly for pushing the PCBs in the storage frame onto the conveying surface.

[0006] In the present invention, the storage frame of the push plate mechanism is used to store PCBs to be loaded, and the push plate assembly is used to push the PCBs stored in the storage frame one by one onto the conveying surface of the conveyor mechanism. After the PCBs are pushed onto the conveying surface, due to the inclined conveying surface, the PCBs will slide until their right edge abuts against the blocking surface of the limit block during conveyance. At this point, the PCB's position in the left-right direction is fixed. Then, as the conveying surface continues to transport the PCBs, it will be transported until its rear edge abuts against the baffle. At this point, the PCB's position in the front, back, left, and right directions is fixed, and the loading operation is completed. The production equipment can then grab the PCB at this position to continue with subsequent processing operations.

[0007] It can be seen that the present invention can complete the positioning operation of the PCB during the process of conveying the PCB on the conveying surface by tilting the conveying surface, without using an additional positioning structure for positioning operation, which can effectively improve the positioning efficiency of the PCB, thereby achieving an improvement in the loading efficiency. At the same time, the elimination of the positioning structure can also simplify the loading device and reduce the production cost of the loading device.

[0008] Furthermore, a roller group is provided on the blocking surface, and the roller group includes a plurality of rollers arranged at equal intervals along the front-to-back direction. The rollers are rotatably mounted on the blocking surface, and the axes of the rollers are arranged perpendicular to the mounting surface. The lower ends of the rollers extend below the conveying surface.

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

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

[0011] Furthermore, the push plate assembly includes a first conveying roller group, the first conveying roller group includes a plurality of first conveying rollers arranged along the left and right directions, the first conveying roller is rotatably set on the first mounting surface, and the axis of the first conveying roller is set along the front and rear directions, and the top ends of the first conveying roller are located in the same horizontal plane to form a bearing surface; the storage frame includes a first limit plate and a second limit plate set on the first mounting surface, the bottom end of the first limit plate is fixedly set at the intersection of the first mounting surface and the second mounting surface, and the first limit plate is inclined to the left at the top end, and the second limit plate is located on the left side of the push plate assembly and is arranged parallel to the first limit plate; the lower end of the first limit plate is provided with a window for the PCB to pass through, and the horizontal height of the top end of the window 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 the present invention, a first limiting plate and a second limiting plate are combined to form a storage frame. The space between the first limiting plate and the second limiting plate is used to accommodate the PCBs to be loaded. The spacing between the first limiting plate and the second limiting plate needs to be the same as the left-right width of the PCB, or slightly larger, for example, 2-6 mm larger than the left-right width of the PCB. The PCBs placed in the storage frame are supported by the first conveyor roller group. The rotation of the first conveyor roller conveys the PCBs. During this process, the PCBs pass through the window at the lower end of the first limiting plate and move above the conveying surface. When the PCBs leave the first conveyor roller group, they fall onto the conveying surface below them and are transported by the conveying surface, thereby pushing the PCBs one by one. Among them, 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 in the process of the first conveyor roller group pushing the PCB, the presence of the second limiting plate can reduce the pressure exerted on the PCB conveyed by the first conveyor roller group from the PCB above it, thereby making it easier to push the PCB, thereby ensuring that the PCB is smoothly pushed to the conveying surface.

[0013] In the present invention, the first conveying roller can be rotatably arranged on the first mounting surface through a bearing structure, and they are driven and connected to each other through a chain structure to maintain synchronous rotation under the drive of the motor, thereby achieving smooth pushing of the PCB.

[0014] In the present invention, the height difference between the upper end of the window at the lower end 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 two PCBs will not be 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 panels are fixedly provided at both front and rear ends of the left side wall of the first limiting plate. The side panels are arranged along the left and right directions and are perpendicular to the first mounting surface. The left end of the side panel is located in the same plane parallel to the first limiting plate to form an abutment surface, and the right side wall of the second limiting plate abuts against the abutment surface.

[0017] In the present invention, the side plates at the front and rear ends of the first limiting plate, together with the first limiting plate and the second limiting plate, form a retaining structure, which can limit the PCBs in the storage frame and prevent the PCBs stacked in the storage frame from tipping over.

[0018] Furthermore, a horizontal support plate is fixedly provided at the bottom end of the right side wall of the second limiting plate, and the support plate can be slid left and right on the first mounting surface through a guide rail. The horizontal height of the upper surface of the support plate is lower than the horizontal height of the bearing surface, and a clearance groove for avoiding the first conveying roller group is provided on the support plate corresponding to 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 the present invention, the support plate at the bottom end of the second limiting plate is used to stack the PCBs. After the PCBs are stacked thereon, the PCBs can be moved to the storage frame by moving the support plate to the right, so that the PCBs are supported by the first conveyor roller group. After the second limiting plate is moved to abut against the abutting surface, the support plate 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 the present invention, the horizontal height of the upper surface of the support plate is lower than the horizontal height of the bearing surface. Therefore, when the support plate moves to the right, the PCB thereon will be pushed to the bearing surface by the first conveyor roller after abutting against 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 pushing mechanism, thereby making it easier to push out the PCB, thereby achieving the purpose of reducing the power requirement of the first conveyor roller.

[0021] Furthermore, the locking mechanism includes mounting plates arranged at the front and rear ends of the second limiting plate, an inserting plate is fixedly arranged on the mounting plate, the inserting plate is arranged horizontally, a first plug hole is provided on the inserting plate and vertically passes through the inserting plate, a connecting plate is provided on the outer side wall of the side plate corresponding to the inserting plate, the connecting plate is attached to the lower side surface of the inserting plate, and a second plug hole aligned with the longitudinal direction is provided on the connecting plate corresponding to the first plug hole.

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

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

[0024] In the present 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-to-back direction, the second conveying rollers are rotatably mounted on the mounting groove, and the axes of the second conveying rollers are arranged perpendicular to the blocking surface, and the upper ends of the side walls of the second conveying rollers are located on the same inclined plane to form a conveying surface.

[0026] In the present invention, the first conveying roller can be rotatably arranged on the first mounting surface through a bearing structure, and is driven and connected to each other through a chain structure to keep synchronous rotation under the drive of the motor, thereby realizing 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 principle and effect of the present invention are further explained below in conjunction with the above technical solutions and the accompanying drawings: The present invention tilts the conveying surface so that the PCB can be positioned while the conveying surface is conveying the PCB, without the need for an additional positioning structure. This effectively improves the positioning efficiency of the PCB, thereby improving the loading efficiency. At the same time, eliminating the positioning structure can also simplify the loading device and reduce the production cost of the loading device. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 Schematic diagram of the structure of the PCB precision loading device according to an embodiment of the present invention; Figure 2 Schematic diagram of the cross-sectional structure of the PCB precision loading device according to an embodiment of the present invention; Figure 3 for Figure 2 A partial enlarged view of Figure 4 This is a schematic diagram of the top view of the PCB precision loading device according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the cross-sectional structure of the PCB precision loading device according to an embodiment of the present invention when the support plate moves right. Reference numerals

[0030] 1-base, 11-first mounting surface, 111-guide rail, 12-second mounting surface, 121-mounting slot, 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-avoidance slot, 4-latch, 5-second conveyor roller, 6-baffle, 7-first conveyor roller. DETAILED DESCRIPTION

[0031] In order to facilitate understanding by those skilled in the art, the present invention will be described in further detail below with reference to the accompanying drawings and embodiments, wherein the directional terms such as up, down, left, and right mentioned in the specification are all indicated by the accompanying drawings. Figure 1 Whichever: like Figure 1-5 , a PCB precision loading device includes a base 1, a conveying mechanism, a blocking mechanism and a push plate 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 downward, and is inclined with the left higher and the right lower, forming a second mounting surface 12; the conveying mechanism includes a mounting groove 121 opened on the second mounting surface 12, and a conveying component arranged in the mounting groove 121, 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 12 and parallel to the second mounting surface 12, a limit block 2 is further provided at the right end of the second mounting surface 12, the left side wall of the limit block 2 forms a blocking surface 21, the blocking surface 21 is arranged along the front-to-back 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 arranged in the mounting groove 121 and is located at the downstream end of the conveying surface, and the upper end of the baffle 6 extends above the conveying surface. The push plate mechanism is located on the left side of the conveying mechanism, and includes a storage frame for storing PCBs provided on the first mounting surface 11, and a push plate assembly for pushing the PCBs in the storage frame onto the conveying surface.

[0032] In the present invention, the storage frame of the push plate mechanism is used to store PCBs to be loaded, and the push plate 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 PCBs are pushed onto the conveying surface, due to the inclined conveying surface, the PCBs will slide until their right edge abuts against the blocking surface 21 of the limit block 2 during conveyance. At this point, the PCB's position in the left-right direction is fixed. Then, as the conveying surface continues to transport the PCBs, the PCBs will be transported until their rear edge abuts against the baffle 6. At this point, the PCB's position in the front-back, left-right, and right-hand directions is fixed, and the loading operation is completed. The production equipment can then grab the PCB at this position to continue with subsequent processing operations.

[0033] It can be seen that the present invention can complete the positioning operation of the PCB during the process of conveying the PCB on the conveying surface by tilting the conveying surface, without using an additional positioning structure for positioning operation, which can effectively improve the positioning efficiency of the PCB, thereby achieving an improvement in the loading efficiency. At the same time, the elimination of the positioning structure can also simplify the loading device and reduce the production cost of the loading device.

[0034] In one embodiment, a group of rollers 22 is provided on the blocking surface 21, and the group of rollers 22 includes a plurality of rollers 22 arranged at equal intervals along the front-to-back direction. The rollers 22 are rotatably mounted on the blocking surface 21, and the axes of the rollers 22 are arranged perpendicular to the mounting surface, and the lower ends of the rollers 22 extend below the conveying surface.

[0035] In this embodiment, a group of rollers 22 are provided on the blocking surface 21. When the PCB is conveyed on the conveying surface, it will slide 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, thereby ensuring the smooth movement of the PCB on the conveying surface and avoiding friction damage between the PCB and the blocking surface 21.

[0036] In this embodiment, the roller 22 can be rotatably mounted on the blocking surface 21 via a bearing structure.

[0037] In one embodiment, the push plate assembly includes a first conveying roller 7 group, the first conveying roller 7 group includes several first conveying rollers 7 arranged along the left and right directions, the first conveying roller 7 is rotatably set on the first mounting surface 11, and the axis of the first conveying roller 7 is set along the front and rear directions, and the top ends of the first conveying rollers 7 are located in the same horizontal plane to form a bearing surface; the storage frame includes a first limit plate 31 and a second limit plate 32 set on the first mounting surface 11, the bottom end of the first limit plate 31 is fixedly set at the junction of the first mounting surface 11 and the second mounting surface 12, and the first limit plate 31 is inclined to the left at the top, and the second limit plate 32 is located on the left side of the push plate assembly and is arranged parallel to the first limit plate 31; the lower end of the first limit plate 31 is provided with a window 311 for the PCB to pass through, and the horizontal height of the top end of the window 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.

[0038] 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 PCBs to be loaded. The spacing between the first limiting plate 31 and the second limiting plate 32 needs to be the same as the width of the PCB in the left-right direction, 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 PCBs placed in the storage frame are supported by the first conveyor roller 7 set. The rotation of the first conveyor roller 7 can realize the conveyance of the PCBs. During this process, the PCBs pass through the window 311 at the lower end of the first limiting plate 31 and move above the conveying surface. When the PCBs leave the first conveyor roller 7 set, they fall onto the conveying surface below them and are transported by the conveying surface, thereby realizing the pushing of the PCBs piece by piece. Among them, 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 in the process of the first conveyor roller 7 group pushing the PCB, the presence of the second limiting plate 32 can reduce the pressure exerted on the PCB conveyed by the first conveyor roller 7 group from the PCB above it, thereby making it easier to push the PCB, thereby ensuring that the PCB is smoothly pushed to the conveying surface.

[0039] In this embodiment, the first conveying roller 7 can be rotatably arranged on the first mounting surface 11 through a bearing structure, and they are driven and connected to each other through a chain structure to maintain synchronous rotation under the drive of the motor, thereby achieving smooth pushing of the PCB.

[0040] In this embodiment, the height difference between the upper end of the window 311 at the lower end of the first limiting plate 31 and the supporting surface is greater than the thickness of one PCB and less than the thickness of two PCBs, which can ensure that two PCBs will not be pushed out at the same time.

[0041] In one embodiment, the angle between the first limiting plate 31 and the horizontal plane is 40°-50°.

[0042] In one embodiment, side panels 33 are fixedly provided at both the front and rear ends of the left side wall of the first limiting plate 31. The side panels 33 are arranged along the left and right directions and are perpendicular to the first mounting surface 11. The left end of the side panel 33 is located in the same plane parallel to the first limiting plate 31 to form an abutment surface, and the right side wall of the second limiting plate 32 abuts against the abutment surface.

[0043] In this embodiment, the side plates 33 at the front and rear ends of the first limiting plate 31, together with the first limiting plate 31 and the second limiting plate 32, form a retaining structure, which can limit the PCBs in the storage frame and prevent the PCBs stacked in the deposit frame from tipping over.

[0044] In one embodiment, a horizontal support plate 34 is fixedly provided at the bottom end of the right side wall of the second limiting plate 32. The support plate 34 can be slid left and right on the first mounting surface 11 through 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, and a clearance groove 341 for avoiding the first conveying roller 7 group is provided on the support plate 34 corresponding to the first conveying roller 7 group; a locking mechanism for fixing the limiting plate is also provided on the side plate 33 corresponding to the second limiting plate 32.

[0045] In this embodiment, the support plate 34 at the bottom end of the second limiting plate 32 is used to stack the PCBs. After the PCBs are stacked thereon, the PCBs can be moved to the storage frame by moving the support plate 34 to the right, so that the PCBs are supported by the first conveyor roller 7 group. After the second limiting plate 32 is moved to abut against the abutting surface, the support plate 34 is moved 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.

[0046] 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, when the support plate 34 moves to the right, the PCB thereon will be pushed to the bearing surface by the first conveyor roller 7 after abutting against 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 pushing mechanism, thereby making it easier to push out the PCB, thereby achieving the purpose of reducing the power requirement of the first conveyor roller 7.

[0047] In one embodiment, the locking mechanism includes a mounting plate 321 arranged at the front and rear ends of the second limiting plate 32, and a plug plate 322 is fixedly arranged on the mounting plate 321. The plug plate 322 is arranged horizontally, and a first plug hole vertically passing through the plug plate 322 is provided on the plug plate 322. A connecting plate 331 is provided on the outer wall of the side plate 33 corresponding to the plug plate 322, and the connecting plate 331 is attached to the lower surface of the plug plate 322, and a second plug hole aligned with the longitudinal direction is provided on the connecting plate 331 corresponding to the first plug hole.

[0048] In this embodiment, after the second limiting plate 32 moves to the right and abuts against the abutting surface, the plug plate 322 thereon will fit against the upper surface of the connecting plate 331. At this time, the second plug hole and the second plug hole are longitudinally aligned. By inserting the pin 4, the second limiting plate 32 and the support plate 34 thereon can be fixed.

[0049] In one embodiment, a handle 323 is further provided on the left side wall of the second limiting plate 32 .

[0050] In this embodiment, the handle 323 on the second limiting plate 32 is used to facilitate pushing and pulling the second limiting plate 32 .

[0051] In one embodiment, the conveying assembly includes a plurality of second conveying rollers 5 arranged at equal intervals along the front-to-back direction, the second conveying rollers 5 are rotatably mounted on the mounting groove 121, and the axis of the second conveying roller 5 is arranged perpendicular to the blocking surface 21, and the upper side ends of the side walls of the second conveying rollers 5 are located on the same inclined plane to form a conveying surface.

[0052] In this embodiment, the first conveying roller 7 can be rotatably arranged on the first mounting surface 11 through a bearing structure, and they are driven and connected to each other through a chain structure to maintain synchronous rotation under the drive of the motor, thereby realizing smooth and uniform conveying of the PCB.

[0053] In one embodiment, the angle between the second mounting surface 12 and the horizontal plane is 15°-30°.

[0054] The above embodiments merely illustrate several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. A PCB precision feeding device, characterized in that: include A base, wherein the upper surface of the base is horizontal, forming a first mounting surface, and the right side of the first mounting surface is tilted downward, with the left side higher and the right side lower, forming a second mounting surface; The conveying mechanism includes a mounting groove provided on the second mounting surface, and a conveying assembly provided in the mounting groove, wherein the conveying assembly forms a conveying surface with a conveying direction from front to back, the conveying surface being located above and parallel to the second mounting surface, a limit block being further provided at the right end of the second mounting surface, a left sidewall of the limit block forming a blocking surface, the blocking surface being provided along the front-to-back direction and perpendicular to the second mounting surface; a blocking mechanism comprising a baffle arranged in the left-right direction and perpendicular to the second mounting surface, the baffle being fixedly disposed in the mounting groove and located at the downstream end of the conveying surface, and the upper end of the baffle extending above the conveying surface; The push plate mechanism is located on the left side of the conveying mechanism and includes a storage frame for storing PCBs arranged on the first mounting surface, and a push plate assembly for pushing the PCBs in the storage frame onto the conveying surface.

2. A PCB precise feeding device according to claim 1, characterized in that: A roller group is provided on the blocking surface, and the roller group includes a plurality of rollers arranged at equal intervals along the front-to-back direction. The rollers are rotatably mounted on the blocking surface, and the axes of the rollers are perpendicular to the mounting surface. The lower ends of the rollers extend below the conveying surface.

3. A PCB precise feeding device according to claim 1 or 2, characterized in that: The push plate assembly includes a first conveying roller group, the first conveying roller group includes a plurality of first conveying rollers arranged along the left and right directions, the first conveying roller is rotatably set on the first mounting surface, and the axis of the first conveying roller is set along the front and rear directions, and the top ends of the first conveying rollers are located in the same horizontal plane to form a bearing surface; the storage frame includes a first limit plate and a second limit plate arranged on the first mounting surface, the bottom end of the first limit plate is fixedly arranged at the intersection of the first mounting surface and the second mounting surface, and the first limit plate is inclined with the top end tilted to the left, and the second limit plate is located on the left side of the push plate assembly and is arranged parallel to the first limit plate; a window is provided at the lower end of the first limit plate for the PCB to pass through, and the horizontal height of the top end of the window 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.

4. A PCB precise feeding device according to claim 3, characterized in that: The included angle between the first limiting plate and the horizontal plane is 40°-50°.

5. The PCB precise feeding device according to claim 3, characterized in that: Side panels are fixedly provided at both front and rear ends of the left side wall of the first limiting plate. The side panels are arranged along the left and right directions and are perpendicular to the first mounting surface. The left ends of the side panels are located in the same plane parallel to the first limiting plate to form abutment surface, and the right side wall of the second limiting plate abuts against the abutment surface.

6. The PCB precise feeding device according to claim 5, characterized in that: A horizontal support plate is fixedly provided at the bottom end of the right side wall of the second limiting plate. The support plate can be slid left and right on the first mounting surface through a guide rail. The horizontal height of the upper surface of the support plate is lower than the horizontal height of the bearing surface, and a clearance groove for avoiding the first conveying roller group is provided on the support plate corresponding to 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.

7. The PCB precise feeding device according to claim 6, characterized in that: The locking mechanism includes mounting plates arranged at the front and rear ends of the second limiting plate, an inserting plate is fixedly arranged on the mounting plate, the inserting plate is arranged horizontally, a first plug hole is provided on the inserting plate and vertically passes through the inserting plate, a connecting plate is provided on the outer side wall of the side plate corresponding to the inserting plate, the connecting plate is attached to the lower side surface of the inserting plate, and a second plug hole aligned with the longitudinal direction is provided on the connecting plate corresponding to the first plug hole.

8. The PCB precise feeding device according to claim 6, characterized in that: A handle is also provided on the left side wall of the second limiting plate.

9. The PCB precise 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-to-back direction. The second conveying rollers are rotatably mounted on the mounting groove, and the axes of the second conveying rollers are arranged perpendicular to the blocking surface. The upper ends of the side walls of the second conveying rollers are located on the same inclined plane to form a conveying surface.

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

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