A heavy-duty PCB board conveying platform

Abstract

The present invention provides a heavy-duty PCB board conveying platform, comprising a synchronous belt track component 1 and a synchronous belt track component 2 which are arranged in parallel and run synchronously; the synchronous belt track component 1 and the synchronous belt track component 2 are both provided with a limit assembly, the limit assembly of the synchronous belt track component 1 and the limit assembly of the synchronous belt track component 2 are symmetrically arranged, the limit assembly comprises a cylinder, a push rod and a limit rod, one end of the push rod is hinged to the end of the cylinder piston rod, and the other end of the push rod is hinged to the limit rod. The synchronous belt of the present invention conveys the PCB board and the limit rod of the limit assembly is combined to limit the PCB board to stop at a suitable position, thereby ensuring that the PCB board can be completely irradiated by the light of the radiation source, and ensuring the integrity of the detection.

Description

Technical Field

[0001] The invention belongs to the field of PCB board conveying, and in particular relates to a heavy PCB board conveying platform. Background Art

[0002] In the existing PCB board belt conveyor tracks, belts are often used for transmission. Flat belts are friction transmissions and are prone to slipping during the transmission process, resulting in low transmission efficiency and low transmission accuracy. They are also not suitable for rigid loads and can only convey some lighter objects. They cannot accurately pause at the appropriate position during X-ray detection. Summary of the invention

[0003] In view of this, the present invention aims to propose a heavy-duty PCB board conveying platform, which conveys the PCB board with a high-precision synchronous belt, and combines the limit rod of the limit assembly to limit the PCB board to pause at a suitable position, thereby ensuring that the PCB board can be completely irradiated by the light of the radiation source and ensuring the integrity of the detection.

[0004] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0005] A heavy-duty PCB board conveying platform comprises a synchronous belt track component 1 and a synchronous belt track component 2 which are arranged parallel to each other and run synchronously; the synchronous belt track component 1 and the synchronous belt track component 2 are both provided with a limit component, the limit component of the synchronous belt track component 1 and the limit component of the synchronous belt track component 2 are symmetrically arranged, the limit component comprises a cylinder, a push rod and a limit rod, one end of the push rod is hinged to the end of the cylinder piston rod, and the other end of the push rod is hinged to the limit rod.

[0006] Further, the synchronous belt track component 1 includes a fixing seat 1, the synchronous belt track component 2 includes a fixing seat 2, the synchronous belt track component 1 is provided with a width adjustment plate on one side close to the synchronous belt track component 2, and the width adjustment plate and the fixing seat 2 are both symmetrically provided with transmission components on the inner side;

[0007] The first fixing seat is connected to the second fixing seat via a guide shaft, the middle of the guide shaft passes through a width adjustment plate, and the width adjustment plate is fixed with a linear bearing and cooperates with the guide shaft;

[0008] A screw rod is also arranged between the fixing seat 1 and the fixing seat 2, the middle part of the screw rod passes through the width adjustment plate, a nut cooperating with the screw rod is arranged on the width adjustment plate, and the screw rod passes through the fixing seat 1 and is connected to the power element.

[0009] Further, the transmission component includes a first synchronous pulley, a first idler wheel, a second idler wheel, a first tensioner wheel, and a synchronous belt wound around the first synchronous pulley, the first idler wheel, the second idler wheel, and the first tensioner wheel; the first synchronous pulley is arranged at one end of the transmission component, the first tensioner wheel is arranged at the other end of the transmission component, and the first idler wheel and the second idler wheel are arranged between the first synchronous pulley and the first tensioner wheel;

[0010] A reducer is fixedly connected to one end of the outer side of the axle of the first synchronous pulley, and a motor is fixedly connected to one end of the reducer away from the first synchronous pulley.

[0011] Furthermore, the transmission component is also provided with an L-shaped push plate and an adjusting bolt. The first tensioning wheel shaft extends outward through a transversely arranged oblong hole and is fixedly connected to the bottom surface of the L-shaped push plate near the first tensioning wheel. The L-shaped push plate is fixedly connected with the adjusting bolt on a vertical surface perpendicular to the bottom surface. The adjusting bolt passes through a vertical plate which is parallel to and has a certain distance from the vertical surface of the L-shaped push plate. The vertical plate is provided with a bolt hole which is screwed together with the adjusting bolt.

[0012] Furthermore, two guide shafts are provided, which are respectively located near one end and the other end of the fixing seat;

[0013] There are two screw rods, the first screw rod is close to the first synchronous pulley, and the second screw rod is far away from the first synchronous pulley. A pair of screw rods are arranged on the inner side of a pair of guide shafts and near the positions of one end and the other end of the fixing seat.

[0014] Further, the power element includes a first driving wheel, a second driving wheel, a belt, a second tensioning wheel, a second motor, and a coupling. The first fixing seat is provided with a screw fixing seat corresponding to a pair of screws. The first screw is connected to the second motor through a coupling at one end provided with the screw fixing seat. The first screw is provided with a first driving wheel between the coupling and the screw fixing seat.

[0015] A second driving wheel is arranged at a position of the second screw rod corresponding to the first driving wheel, a belt is wound around the outside of the first driving wheel and the second driving wheel, and a second tensioning wheel is arranged at a position between the first driving wheel and the second driving wheel;

[0016] The first screw rod and the second screw rod are both mounted on the second fixing seat via bearings and C-shaped retaining rings.

[0017] Furthermore, the power element also includes a handle, and one end of the second screw rod extends out of the second fixing seat and is fixedly connected to the handle.

[0018] Furthermore, the two upper end surfaces of the width adjustment plate and the fixed seat are fixedly connected to the limit plate for limiting the sliding of the PCB board to both sides, the limit plate is provided with a clearance position corresponding to the limit rod, the upper side of one end of the cylinder close to the clearance position is fixedly connected to the cross plate, and the lower surface of the cross plate is provided with a slide rail cooperating with the limit rod.

[0019] Furthermore, the width adjustment plate and the second fixing seat are both provided with a first beam sensor on the upper side near both ends;

[0020] The width adjustment plate is provided with two limit assemblies, and the second fixing seat is symmetrically provided with another two limit assemblies corresponding to the two limit assemblies on the width adjustment plate, and the limit rod can fit with the end of the PCB board to limit the movement of the PCB board.

[0021] The width adjustment plate and the second fixing seat are both provided with a second through-beam sensor on a side of the limit assembly away from the first through-beam sensor. The second through-beam sensor at the same end of the width adjustment plate and the second fixing seat cooperate to obtain a PCB board in place signal.

[0022] Compared with the prior art, the heavy-duty PCB conveying platform described in the present invention has the following advantages:

[0023] (1) The synchronous belt of the present invention transmits the PCB board, and the limit rod of the limit assembly limits the PCB board to stop at a suitable position, thereby ensuring that the PCB board can be completely irradiated by the light of the radiation source, thereby ensuring the integrity of the detection.

[0024] (2) The first idler wheel 222 and the second idler wheel 223 described in the present invention are used for bearing weight, and can transport heavy PCB boards to maintain the smoothness of transmission. At the same time, when the PCB boards are transported to the middle part and detected by the radiation source and the flat panel detector, the first idler wheel 222 and the second idler wheel 223 can keep the PCB boards in a horizontal state, thereby ensuring the accuracy of the detection.

[0025] (3) The width adjustment plate of the present invention can be adjusted by balancing the two screws to create a transmission space suitable for PCB boards of different widths, and is highly practical.

[0026] (4) The first and second through-beam sensors of the present invention can efficiently transmit the direction in which the PCB enters the platform and drive the limit assembly, and can cooperate flexibly, thereby ensuring that the PCB accurately stays under the radiation source for detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0028] Figure 1 This is a structural diagram of a heavy-duty PCB board conveying platform on one side of a synchronous belt track assembly according to an embodiment of the present invention;

[0029] Figure 2 This is a structural diagram of a heavy-duty PCB board conveying platform on two sides of a synchronous belt track assembly according to an embodiment of the present invention.

[0030] Description of reference numerals:

[0031] 1-synchronous belt track assembly 1; 11-fixed seat 1; 111-screw fixed seat; 12-width adjustment plate; 121-linear bearing; 122-nut; 13-guide shaft; 14-screw; 141-first screw; 142-second screw; 15-power element; 151-first drive wheel; 152-second drive wheel; 153-belt; 154-second tension wheel; 155-motor 2; 156-coupling; 157-handle; 2-synchronous belt track assembly 2; 21-fixed Seat 2; 22-transmission component; 221-first synchronous pulley; 222-first idler; 223-second idler; 224-first tensioner; 225-L-type push plate; 226-adjusting bolt; 227-long round hole; 228-synchronous belt; 23-reducer 1; 24-motor 1; 25-limit plate; 26-opposite sensor 1; 27-opposite sensor 2; 3-limit assembly; 31-cylinder; 311-cross plate; 312-slide rail; 32-push rod; 33-limit rod. DETAILED DESCRIPTION

[0032] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0033] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0034] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0035] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0036] like Figure 1 , Figure 2 As shown, a heavy-duty PCB board conveying platform includes a synchronous belt track component 1 and a synchronous belt track component 2 which are arranged parallel to each other and run synchronously; the synchronous belt track component 1 and the synchronous belt track component 2 are both provided with a limit component 3, the limit component of the synchronous belt track component 1 and the limit component of the synchronous belt track component 2 are symmetrically arranged with each other, the limit component includes a cylinder 31 and a push rod 32 and a limit rod 33, one end of the push rod 32 is hinged to the end of the cylinder piston rod, and the other end of the push rod 32 is hinged to the limit rod 33.

[0037] The upper side of the platform is also provided with a radiation source for detecting the PCB board and a flat-panel detector arranged on the lower side of the platform and corresponding to the PCB board for detecting whether the PCB board is qualified. The PCB board is conveyed on the conveying platform and a pause detection is performed between the radiation source and the flat-panel detector. The platform conveys the PCB board through a synchronous belt, and the limit rod 33 of the limit assembly 3 is combined to limit the PCB board to pause at a suitable position, so as to ensure that the PCB board can be completely irradiated by the light of the radiation source and ensure the integrity of the detection.

[0038] like Figure 1 , Figure 2 As shown, the synchronous belt track component 1 includes a fixing seat 11, the synchronous belt track component 2 includes a fixing seat 21, the synchronous belt track component 1 is provided with a width adjustment plate 12 on one side close to the synchronous belt track component 22, and the width adjustment plate 12 and the fixing seat 21 are both symmetrically provided with transmission components 22 on the inner side;

[0039] The fixing seat 11 is connected to the fixing seat 21 through a guide shaft 13, the middle of the guide shaft 13 passes through the width adjustment plate 12, and the width adjustment plate 12 is fixed with a linear bearing 121 that cooperates with the guide shaft 13;

[0040] A screw rod 14 is also provided between the fixing seat 11 and the fixing seat 2 21 . The middle part of the screw rod 14 passes through the width adjustment plate 12 . A nut 122 matching with the screw rod is provided on the width adjustment plate 12 . The screw rod 14 passes through the fixing seat 1 and is connected to the power element 15 .

[0041] The transmission component 22 is used to transport the PCB board, and the rotation of the screw rod 14 can drive the width adjustment plate 12 to adjust the distance between the two transmission components to adapt to different PCB board sizes.

[0042] like Figure 1 , Figure 2 As shown, the transmission component 22 includes a first synchronous pulley 221, a first idler wheel 222, a second idler wheel 223, a first tensioner wheel 224, and a synchronous belt 228 wound around the first synchronous pulley, the first idler wheel, the second idler wheel, and the first tensioner wheel; the first synchronous pulley 221 is arranged at one end of the transmission component 22, the first tensioner wheel 224 is arranged at the other end of the transmission component 22, and the first idler wheel 222 and the second idler wheel 223 are arranged between the first synchronous pulley 221 and the first tensioner wheel 224;

[0043] A reducer 23 is fixedly connected to one end of the outer side of the axle of the first synchronous pulley, and a motor 24 is fixedly connected to one end of the reducer 23 away from the first synchronous pulley 221.

[0044] The first idler wheel 222 and the second idler wheel 223 are used for bearing weight, and can transport heavier PCB boards to maintain the stability of transmission. At the same time, when the PCB boards are transported to the middle and detected by the radiation source and the flat panel detector, the first idler wheel 222 and the second idler wheel 223 can ensure the levelness of the PCB boards.

[0045] By utilizing the meshing transmission of the synchronous belt 228, the weight range of the load object can be wider, the transmission efficiency is improved, the transmission accuracy is increased, the failure rate is reduced, and it is safe and reliable.

[0046] like Figure 1 , Figure 2 As shown, the conveying component 22 is also provided with an L-shaped push plate 225 and an adjusting bolt 226. The first tensioning wheel 224 has an axle extending outwardly through a transversely arranged oblong hole 227 fixedly connected to the bottom surface of the L-shaped push plate 225 near the first tensioning wheel. The L-shaped push plate is fixedly connected with the adjusting bolt 226 on a vertical surface perpendicular to the bottom surface. The adjusting bolt 226 passes through a vertical plate 227 which is parallel to the vertical surface of the L-shaped push plate and has a certain distance therefrom. The vertical plate 227 is provided with a bolt hole which is screwed together with the adjusting bolt 226.

[0047] The axle of the first tensioner wheel can be pushed by adjusting the bolt 226, thereby loosening and tightening the synchronous belt.

[0048] like Figure 1 , Figure 2 As shown, two guide shafts 13 are provided, which are respectively located near the two ends of the fixing seat 11;

[0049] The screw rods 14 are provided with two, the first screw rod 141 is close to the first synchronous pulley 221, and the second screw rod 142 is far away from the first synchronous pulley 221. The pair of screw rods are arranged inside the pair of guide shafts 13 and near the two ends of the fixing seat 11.

[0050] A pair of guide shafts are provided to ensure the stability of the conveying platform, and a pair of screw rods are provided to ensure the smoothness of pushing the width-adjusting plate.

[0051] like Figure 1 , Figure 2 As shown, the power element 15 includes a first driving wheel 151, a second driving wheel 152, a belt 153, a second tensioning wheel 154, a second motor 155, and a coupling 156. The first fixing seat 11 is provided with a screw fixing seat 111 corresponding to a pair of screws 14. The first screw 141 is connected to the second motor 155 through a coupling 156 at one end provided with the screw fixing seat 111. The first driving wheel 151 is provided between the coupling and the screw fixing seat of the first screw 141.

[0052] The second screw rod 142 is provided with a second driving wheel 152 at a position corresponding to the first driving wheel 151. A belt 153 is wound around the outside of the first driving wheel 151 and the second driving wheel 152. A second tensioning wheel 154 is provided between the belt 153.

[0053] The first screw rod 141 and the second screw rod 142 are both mounted on the second fixing seat via bearings and C-shaped retaining rings.

[0054] The screw support seat is of prior art and includes a bearing, a spacer ring, a fixing nut and an anti-loosening screw.

[0055] The tensioning method of the second tensioning wheel is the same as that of the first tensioning wheel. By pushing the bolt and cooperating with the bolt hole provided on the second fixing seat and cooperating with the pushing bolt, the wheel axle of the second tensioning wheel is pushed to tighten the belt. The second tensioning wheel can move axially along the pushing bolt on the second fixing seat.

[0056] like Figure 1 , Figure 2 As shown, the power element 15 further includes a handle 157 , and one end of the second screw rod extends out of the second fixing seat and is fixedly connected to the handle 157 .

[0057] The first screw can be driven to rotate by the second motor, and the first screw drives the second screw to move through the power element, or the second screw can be driven to rotate by the handle, and the second screw drives the first screw to rotate through the power element;

[0058] Both driving modes can enable the first screw rod and the second screw rod to cooperate to adjust the position of the width adjustment plate, thereby adjusting the width between the two synchronous belts to adapt to more types of PCB boards.

[0059] like Figure 1 , Figure 2 As shown, the width adjustment plate 12 and the upper end surfaces of the second fixing seat 21 are fixedly connected to the limit plate 25 for limiting the sliding of the PCB board to both sides, and the limit plate 25 is provided with a clearance position corresponding to the limit rod 33. The upper side of one end of the cylinder 31 near the clearance position is fixedly connected to the horizontal plate 311, and the lower surface of the horizontal plate is provided with a slide rail 312 that cooperates with the limit rod 33.

[0060] The limit plate 25 can limit the movement of the PCB board along the direction of movement of the synchronous belt, and the limit rod 33 cooperates with the slide rail 312 to make the movement of the limit assembly 3 more stable.

[0061] like Figure 1 , Figure 2 As shown, the width adjustment plate 12 and the second fixing seat 21 are both provided with a corresponding sensor 26 on the upper side near both ends;

[0062] The same end of the width adjustment plate 12 and the second fixing seat 21 is respectively fixed with a receiving end and a transmitting end of a first radiation sensor, so as to cooperate in obtaining the signal from which end the PCB board enters.

[0063] The width adjustment plate 12 is provided with two limit assemblies, and the second fixing seat is symmetrically provided with another two limit assemblies 3 corresponding to the two limit assemblies 3 on the width adjustment plate 12, and the limit rod can fit with the end of the PCB board to limit the movement of the PCB board.

[0064] The width adjustment plate 12 and the second fixing seat 21 are both provided with a second through-beam sensor 27 on the side of the limit assembly 3 away from the first through-beam sensor 26. The second through-beam sensor at the same end of the width adjustment plate 12 and the second fixing seat 21 cooperate to obtain a PCB board in place signal.

[0065] Working process:

[0066] The ray source irradiates the PCB board, and the quality of the PCB board is detected by the flat panel detector.

[0067] The motor 1 can be rotated forward and reverse, and the PCB board can enter the conveying platform in both directions on the synchronous belt. The through-beam sensor 1 26 can sense the direction in which the PCB board enters. At this time, the through-beam sensor 2 on the side close to the PCB board is closed, and the through-beam sensor 2 on the side away from the PCB board senses the PCB board, controls the motor 1 to rotate a certain number of circles, and the synchronous belt drives the PCB board to move for a section to reach a suitable detection position below the radiation source;

[0068] At the same time, when the through-beam sensor 2 on the side away from the PCB board senses the PCB board, it also sends a signal to a pair of limit assemblies 3 on the side away from the PCB board. The piston rod of the cylinder 31 is pulled back and the limit rod 33 is pushed out to limit the PCB board to the correct detection position and prevent the PCB board from moving too much forward due to inertia and other reasons and exceeding the area irradiated by the radiation source.

[0069] The second motor or the handle rotates to drive the belt to rotate, and the belt drives the lead screw to rotate, driving the width adjustment plate to move, and the distance between the two synchronous belts is determined according to the maximum size of the PCB board.

[0070] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A heavy-duty PCB board conveying platform, characterized by: The invention comprises a synchronous belt track component 1 (1) and a synchronous belt track component 2 (2) which are arranged in parallel and run synchronously with each other; the synchronous belt track component 1 (1) and the synchronous belt track component 2 (2) are both provided with a limit assembly (3); the limit assembly of the synchronous belt track component 1 (1) and the limit assembly of the synchronous belt track component 2 (2) are arranged symmetrically with each other; the limit assembly comprises a cylinder (31), a push rod (32) and a limit rod (33); one end of the push rod (32) is hinged to the end of the cylinder piston rod, and the other end of the push rod (32) is hinged to the limit rod (33); The synchronous belt track component 1 (1) comprises a fixing seat 1 (11), and the synchronous belt track component 2 (2) comprises a fixing seat 2 (21). A width adjustment plate (12) is arranged on the side of the synchronous belt track component 1 (1) close to the synchronous belt track component 2 (2), and the width adjustment plate (12) and the fixing seat 2 (21) are both symmetrically provided with a transmission component (22) on the inner side. The fixing seat 1 (11) and the fixing seat 2 (21) are connected via a guide shaft (13); the middle portion of the guide shaft (13) passes through the width adjustment plate (12); the width adjustment plate (12) is fixed with a linear bearing (121) and cooperates with the guide shaft (13); A screw rod (14) is also arranged between the fixing seat 1 (11) and the fixing seat 2 (21), the middle part of the screw rod (14) passes through the width adjustment plate (12), a nut (122) matching with the screw rod is arranged on the width adjustment plate (12), and the screw rod (14) passes through the fixing seat 1 and is connected to the power element (15); The transmission component (22) comprises a first synchronous pulley (221), a first idler wheel (222), a second idler wheel (223), a first tensioner wheel (224), and a synchronous belt (228) wound around the first synchronous pulley, the first idler wheel, the second idler wheel, and the first tensioner wheel; the first synchronous pulley (221) is arranged at one end of the transmission component (22), the first tensioner wheel (224) is arranged at the other end of the transmission component (22), and the first idler wheel (222) and the second idler wheel (223) are arranged between the first synchronous pulley (221) and the first tensioner wheel (224); A reducer (23) is fixedly connected to one end of the outer side of the axle of the first synchronous pulley, and a motor (24) is fixedly connected to one end of the reducer (23) away from the first synchronous pulley (221); The transmission component (22) is also provided with an L-shaped push plate (225) and an adjusting bolt (226); the first tensioning wheel (224) has an axle extending outwardly through a transversely arranged oblong hole (227) and is fixedly connected to the bottom surface of the L-shaped push plate (225) near the first tensioning wheel; the L-shaped push plate is fixedly connected with the adjusting bolt (226) on a vertical surface perpendicular to the bottom surface; the adjusting bolt (226) passes through a vertical plate which is parallel to and has a certain distance from the vertical surface of the L-shaped push plate; the vertical plate is provided with a bolt hole which is screwed together with the adjusting bolt (226).

2. A heavy-duty PCB board conveying platform according to claim 1, characterized in that: The guide shafts (13) are provided with two, and are respectively located near the two ends of the fixing seat (11); The screw rods (14) are provided with two, the first screw rod (141) being close to the first synchronous pulley (221), and the second screw rod (142) being far away from the first synchronous pulley (221), and the pair of screw rods are arranged on the inner side of the pair of guide shafts (13) and near the two ends of the fixing seat (11).

3. A heavy-duty PCB board conveying platform according to claim 2, characterized in that: The power element (15) comprises a first driving wheel (151), a second driving wheel (152), a belt (153), a second tensioning wheel (154), a second motor (155), and a coupling (156); a screw fixing seat (111) is provided in correspondence with a pair of screws (14) in the first fixing seat (11); the first screw (141) is connected to the second motor (155) through a coupling (156) at one end where the screw fixing seat (111) is provided; and a first driving wheel (151) is provided between the coupling and the screw fixing seat of the first screw (141); The second screw rod (142) is provided with a second driving wheel (152) at a position corresponding to the first driving wheel (151); a belt (153) is wound around the outside of the first driving wheel (151) and the second driving wheel (152); and a second tensioning wheel (154) is provided at a position between the first driving wheel and the second driving wheel on the belt (153); The first screw rod (141) and the second screw rod (142) are both mounted on the second fixing seat via bearings and C-shaped retaining rings.

4. A heavy-duty PCB conveying platform according to claim 3, characterized in that: The power element (15) further comprises a handle (157), and one end of the second screw rod extends out of the second fixing seat and is fixedly connected to the handle (157).

5. The heavy-duty PCB conveying platform according to claim 1, characterized in that: The width adjustment plate (12) and the upper end surfaces of the second fixing seat (21) are both fixedly connected to a limit plate (25) for limiting the sliding of the PCB board to both sides; the limit plate (25) is provided with a clearance position corresponding to the limit rod (33); the upper side of one end of the cylinder (31) close to the clearance position is fixedly connected to a transverse plate (311); and the lower surface of the transverse plate is provided with a slide rail (312) that cooperates with the limit rod (33).

6. A heavy-duty PCB board conveying platform according to claim 1, characterized in that: The width adjustment plate (12) and the second fixing seat (21) are both provided with a first radiation sensor (26) on the upper side near both ends; The width adjustment plate (12) is provided with two limit assemblies, the second fixing seat is symmetrically provided with another two limit assemblies (3) corresponding to the two limit assemblies (3) on the width adjustment plate (12), and the limit rod can be fitted with the end of the PCB board to limit the movement of the PCB board; The width adjustment plate (12) and the second fixing seat (21) are both provided with a second beam sensor (27) on a side of the limit assembly (3) away from the first beam sensor (26), and the second beam sensor at the same end of the width adjustment plate (12) and the second fixing seat (21) cooperate to obtain a PCB board in place signal.

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