Bottom plate mounting equipment for PCB (Printed Circuit Board) production

Abstract

The utility model relates to a bottom plate mounting device for PCB production, which comprises a supporting base and a supporting frame supported on the supporting base, and a conveying mechanism for directionally conveying a bottom plate and a rotary feeding mechanism for supplying electronic elements to be mounted are supported on the supporting base; a pre-cleaning assembly, a coating assembly and a mounting assembly are arranged on the supporting frame in a partitioned mode in the bottom plate conveying direction limited by the conveying mechanism. Elastic limiting assemblies for adjustably aligning and clamping the bottom plate are arranged on a conveying belt of the conveying mechanism at intervals, and the elastic limiting assemblies are matched with limiting blocking strips arranged on a belt body of the conveying belt at intervals to limit the bottom plate. According to the utility model, the base plates with various sizes can be adaptively and effectively positioned and clamped, so that the precision of the station is ensured, and the base plates are cleaned and uniformly coated, so that the mounting quality and performance are ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to the surface mount technology field for PCB production especially relates to a bottom plate mounting equipment for PCB production. BACKGROUND

[0002] PCB (Printed Circuit Board), Chinese name is printed circuit board, is one of important components of electronic industry. Almost every kind of electronic equipment, small to electronic watch, calculator, large to computer, communication electronic equipment, military weapon system, as long as integrated circuit and other electronic components, in order to the electrical interconnection between them, all need to use printed board. The production process of PCB includes printing, surface mount, welding and testing and multiple steps, wherein, the surface mount step is to mount electronic components to PCB bottom plate. Before carrying out the mounting operation of PCB, usually need to coat tin paste and so on on the board surface to guarantee the effectiveness of attachment installation, then after reflow soldering treatment makes electronic components and PCB bottom plate connect firmly. In addition, need to guarantee the uniformity of tin paste coating before mounting, otherwise easy to appear the problems such as incomplete welding or lack of welding in subsequent processing, and then cause the poor contact between PCB bottom plate and welded components, affect the flow of current on PCB bottom plate, thereby affect the overall performance.

[0003] However, the existing mounting equipment when conveying PCB bottom plate, the surface of the plate material is easy to adhere to the dust diffused in the air and cause its surface cleanliness to decline, affect the subsequent mounting and welding quality, and the existing conveying line does not have adjustable bottom plate limiting structure, cannot effectively position the position of bottom plate on the conveying belt, is easy to cause the mounting station to shift, causes the inaccurate butt joint of surface mount, affects the quality, performance and reliability after mounting, and the limiting structure cannot adaptively correct and hold the bottom plate of multiple sizes, reduces the precision and efficiency of mounting. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a bottom plate mounting equipment for PCB production that can adaptively effectively position and hold the bottom plate of multiple sizes to guarantee the precision of its station, clean and uniformly coat the bottom plate to guarantee the mounting quality and performance, to solve the defects that the existing mounting equipment cannot adaptively automatically correct and hold the bottom plate of multiple sizes, the precision of clamping and positioning is poor, the application range of clamping structure is small, and the existing surface mount equipment does not have cleaning and coating functions when conveying the bottom plate, is easy to cause the poor comprehensive mounting quality.

[0005] The technical scheme adopted by the utility model is: a bottom plate mounting equipment for PCB production, which comprises a supporting base, a supporting frame supported on the supporting base, a conveying mechanism for directional conveying of the bottom plate and a rotary feeding mechanism for supplying electronic components to be mounted are supported on the supporting base; a pre-cleaning assembly, a coating assembly and a mounting assembly are arranged in zones along the bottom plate conveying direction defined by the conveying mechanism on the supporting frame; a plurality of elastic limiting assemblies for adjustable alignment clamping of the bottom plate are arranged at intervals on the conveying belt of the conveying mechanism, wherein the elastic limiting assemblies are limiting bars arranged at intervals on the belt body of the conveying belt and cooperate with the limiting bars to limit the bottom plate.

[0006] According to a preferred embodiment, the elastic limiting assembly comprises a limiting shell arranged on the conveying belt, an abutting head, a buffer limiting spring and an adjusting support, wherein the abutting head capable of alignment clamping of the bottom plate is movably inserted into the surface of the two limiting shells facing each other, and the end of the abutting head inserted into the limiting shell is connected with the adjusting support through the buffer limiting spring.

[0007] According to a preferred embodiment, the clamping limiting plate of the abutting head is connected with the first bottom plate in the limiting shell through the first movable insertion rod, and the clamping limiting plate and the first bottom plate are parallel to each other.

[0008] According to a preferred embodiment, the second bottom plate of the adjusting support is arranged in the limiting shell in a manner that it is parallel to the first bottom plate and can push the first bottom plate to move synchronously, and the side of the second bottom plate away from the first bottom plate is provided with a guide slide rod and a threaded insertion rod parallel to each other and penetrating the shell wall of the limiting shell.

[0009] According to a preferred embodiment, a plurality of limiting bars are installed on the conveying belt in a manner that they have the same arrangement interval distance as the elastic limiting assembly, and the limiting bars are cooperated with the two alignment arranged clamping limiting plates to form an expandable U-shaped limiting structure to position the substrate.

[0010] According to a preferred embodiment, the coating assembly comprises a second lifting rod, a storage tank, a discharge nozzle, a brush body and a scraper, wherein the second lifting rod is connected to the supporting frame, and the axial lower end of the second lifting rod is connected with the storage tank; the discharge nozzle is arranged at intervals in the bottom of the storage tank, and the brush body and the scraper are further arranged on the bottom surface of the storage tank.

[0011] According to a preferred embodiment, the brush body is staggered with the row of discharge nozzles, so as to brush the multi-point output material evenly; and the scraper is connected to the bottom edge of the storage tank in a way that an inclined surface is formed.

[0012] According to a preferred embodiment, the nozzle shell of the discharge nozzle is obliquely inserted into the bottom surface of the storage tank, and the lower end opening edge of the nozzle shell is rotatably connected with a deflection baffle capable of shielding the opening thereof, and the bottom surface of the deflection baffle is provided with a weight adjusting block capable of limiting the working position thereof.

[0013] According to a preferred embodiment, the dust suction pipe of the pre-cleaning assembly is connected to the support frame through a first lifting rod, and the dust suction pipe is communicated with a dust suction unit through a communication pipe.

[0014] According to a preferred embodiment, the third lifting rod of the mounting assembly suspends the deflection motor and the deflection plate above the conveying belt in a liftable manner, and the deflection motor can drive the deflection plate to rotate, and both ends of the deflection plate are provided with a grabbing piece suction cup and a suction cylinder communicated with the grabbing piece suction cup.

[0015] The beneficial effects of the utility model are:

[0016] The conveying mechanism can cooperate with the elastic limiting component to accurately position the bottom plate and ensure the accuracy of the interval arrangement, so that the bottom plate can effectively and accurately complete various processing procedures during directional movement following the conveying mechanism. The pre-cleaning assembly can effectively clean the surface of the bottom plate to ensure the cleanliness of the surface of the bottom plate. The coating assembly can accurately coat uniform and flat level materials on the bottom plate to ensure the effect and quality of coating. The mounting assembly can adjustably continuously transfer electronic components and complete the mounting operation of the electronic components, improve the overall mounting effect and quality, avoid the problems of mounting deviation caused by the fluctuation of manual mounting force, improve the accuracy of mounting connection, and ensure the overall quality, performance and reliability after mounting. The elastic limiting component can adjust the clamping strength and distance according to the actual size of the bottom plate, so that it can accurately and effectively clamp and limit the bottom plate of various sizes adaptively, expand the application range and effectiveness of clamping and limiting, and improve the positioning accuracy and efficiency of subsequent processing.

[0017] The conveying belt can continuously and directionally convey the bottom plate, so that the bottom plate completes cleaning, coating and patch processing in multiple continuous stations respectively, thereby realizing integration and continuity of multiple processes, improving processing efficiency and quality. Especially, the limiting barrier can be effectively matched with the elastic limiting component to effectively center and limit the bottom plate of multiple sizes, thereby ensuring uniformity of subsequent coating and accuracy of patching, improving accuracy and quality of patching, and ensuring performance and reliability of the PCB product. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a preferred structure schematic view of a bottom plate mounting equipment for PCB production provided by the present application;

[0019] Figure 2 is a preferred lateral plane schematic view of a mounting assembly position of a bottom plate mounting equipment for PCB production provided by the present application;

[0020] Figure 3 is a preferred partial structure schematic view of a coating assembly of a bottom plate mounting equipment for PCB production provided by the present application;

[0021] Figure 4 is a preferred partial structure schematic view of an elastic limiting component of a bottom plate mounting equipment for PCB production provided by the present application;

[0022] Figure 5 is a preferred plane schematic view of an elastic limiting component of a bottom plate mounting equipment for PCB production provided by the present application.

[0023] LIST OF REFERENCE NUMERALS

[0024] 1: support base; 2: support frame; 3: conveying mechanism; 4: rotary feeding mechanism; 5: pre-cleaning assembly; 6: coating assembly; 7: mounting assembly; 8: elastic limiting component; 31: conveying belt; 32: roller; 33: support column; 34: step drive motor; 35: auxiliary support plate; 311: limiting barrier; 51: dust suction pipe; 52: first lifting rod; 53: communication pipe; 54: dust suction unit; 61: second lifting rod; 62: storage tank; 63: discharge nozzle; 64: brush body; 65: scraper; 631: nozzle shell; 632: deflection baffle; 633: weight adjusting block; 71: third lifting rod; 72: deflection motor; 73: deflection plate; 74: grabbing suction cup; 75: suction cylinder; 81: limiting shell; 82: abutting head; 83: buffer limiting spring; 84: adjusting support; 821: clamping limiting plate; 822: first movable insertion rod; 823: first bottom plate; 841: second bottom plate; 842: guide sliding rod; 843: threaded insertion rod. DETAILED DESCRIPTION

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the present application will be briefly introduced below in combination with the drawings and the description of the embodiments or the prior art. Obviously, the following description of the drawings structure is only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor on the premise of not paying creative labor.

[0026] The technical solutions provided by the present application will be described in detail below with reference to the drawings by way of embodiments. It should be noted that the description of these embodiments is used to help understand the present application, and does not constitute a limitation on the present application. In some examples, since some embodiments belong to prior art or conventional technology, they are not described or not described in detail.

[0027] In addition, the technical features described in this paper, or the steps in all the methods or processes disclosed, can be combined in any suitable way in one or more embodiments, except for mutually exclusive features and / or steps. For those skilled in the art, the steps or order of the methods related to the embodiments provided herein can also be changed. Any order in the drawings and embodiments is only used for illustration and does not imply that it is required to follow a certain order unless it is explicitly stated that it is required to follow a certain order.

[0028] The serial numbers of the components in this paper, such as "first", "second", etc., are only used to distinguish the described objects, and do not have any order or technical meaning. The "connection" and "coupling" in this application include direct and indirect connection (coupling) under reasonable circumstances (not contradictory).

[0029] The following will be described in detail in combination with the drawings.

[0030] Embodiment 1

[0031] The present application provides a bottom plate mounting equipment for PCB production, which comprises a supporting base 1, a supporting frame 2, a conveying mechanism 3, a rotary feeding mechanism 4, a pre-cleaning assembly 5, a coating assembly 6, a mounting assembly 7 and an elastic limiting assembly 8.

[0032] According to Figures 1-5In the shown specific embodiment, a support frame 2 providing a suspended mounting plane is supported on a support base 1 capable of providing a mounting plane, so as to cooperatively form two mutually parallel mounting planes. A conveying mechanism 3 for directional conveying of the bottom plate and a rotary feeding mechanism 4 for supplying the electronic components to be mounted are supported on the support base 1. The pre-cleaning assembly 5, the coating assembly 6 and the mounting assembly 7 are arranged in zones on the support frame 2 along the conveying direction of the bottom plate defined by the conveying mechanism 3, and are capable of sequentially completing the dust removal, coating and mounting operations of the bottom plate above the conveying belt 31. The elastic limiting assemblies 8 capable of adjustably aligning and clamping the bottom plate are arranged at intervals on the conveying belt 31 of the conveying mechanism 3. The elastic limiting assemblies 8 are cooperated with the limiting bars 311 arranged at intervals on the belt body of the conveying belt 31 to limit the bottom plate. The conveying mechanism 3 provided in the present application can cooperatively precisely position the bottom plate with the elastic limiting assemblies 8 to ensure the accuracy of the interval arrangement, so as to effectively and accurately complete various processing procedures during the directional movement of the bottom plate following the conveying mechanism 3. The pre-cleaning assembly 5 provided in the present application can effectively clean the surface of the bottom plate to ensure the cleanliness of the surface of the bottom plate. The coating assembly 6 provided in the present application can precisely coat uniform and flat level material on the bottom plate to ensure the effect and quality of the coating. The mounting assembly 7 provided in the present application can adjustably continuously transfer the electronic components and complete the mounting operation of the electronic components, which improves the effect and quality of the overall mounting, avoids the problems of mounting deviation caused by the fluctuation of the applied force during manual mounting, improves the accuracy of the mounting connection, and ensures the overall quality, performance and reliability after mounting. The elastic limiting assemblies 8 provided in the present application can adjust the clamping strength and distance according to the actual size of the bottom plate, so as to adaptively accurately and effectively clamp and limit the bottom plate of various sizes, which expands the application range and effectiveness of the clamping and limiting, and improves the positioning accuracy and efficiency of the subsequent processing.

[0033] Preferably, a plurality of limiting bars 311 are installed on the conveying belt 31 in the same layout interval distance as the elastic limiting assembly 8. Preferably, the limiting bars 311 are designed as expandable and deformed H-shaped limiting structures in cooperation with the two oppositely arranged clamping limiting plates 821 to position the substrate. Preferably, the two ends of the conveying belt 31 are synchronously rotatably sleeved on the rollers 32. Further preferably, the rollers 32 are supported on the support base 1 by the support columns 33. Preferably, the support columns 33 are also provided with a stepping drive motor 34 capable of driving the rollers 32 to rotate. Preferably, the stepping drive motor 34 adopts a PMC007 series stepping motor with a TMC2160 stepping motor drive chip. Preferably, an auxiliary support plate 35 capable of providing auxiliary support force to the conveying surface formed by the conveying belt 31 is arranged between the two rollers 32. Specifically, the auxiliary support plate 35 is connected to the support column 33 by a connecting rod or the like. During manual or other mechanical placement operation, one side of the substrate is placed against the limiting bar 311, so that the limiting bar 311 can position the substrate at a point in the movement direction of the conveying belt 31 while avoiding relative slipping between the substrate and the conveying belt 31 during conveying of the substrate by the conveying belt 31, thereby improving the speed and accuracy of the placement, so as to more efficiently and quickly complete the placement operation of the substrate. The conveying belt 31 provided in the present application can continuously and directionally convey the substrate, so that the substrate can complete cleaning, coating and patch processing in a plurality of consecutive stations respectively, thereby realizing integration and continuity of multiple processes and improving processing efficiency and quality. Especially, the limiting bar 311 can efficiently cooperate with the elastic limiting assembly 8 to effectively center and limit the substrate of multiple sizes, thereby ensuring the uniformity of subsequent coating and the accuracy of patching, thereby improving the accuracy and quality of mounting, so as to ensure the performance and reliability of the PCB product.

[0034] Preferably, the rotary feeding mechanism 4 can include a rotary feeding disc capable of being driven by a stepping rotary motor, and a plurality of electronic component accommodation grooves are arranged on the rotary feeding disc in a ring shape, so that the two grabbing suction cups 74 of the deflection plate 73 are respectively above the rotary feeding disc and the conveying belt 31, and then the electronic components are transferred between the rotary feeding disc and the conveying belt through periodic lifting movement and intermittent grabbing and releasing operation, so as to continuously position and mount the electronic components provided by the rotary feeding mechanism 4 on the substrate directionally conveyed on the conveying belt 31. Further preferably, the rotary feeding mechanism 4 of the present application can directly refer to the feeding disc structure disclosed in the patch device with publication number CN214482130U. Further preferably, the rotary feeding mechanism 4 can move laterally on the support base 1, so as to change the distance between the rotary feeding mechanism 4 and the conveying belt 31, so that the mounting assembly 7 can perform mounting operation on different point positions of the substrate.

[0035] Preferably, the suction pipe 51 of the pre-cleaning component 5 is connected to the support frame 2 via the first lifting rod 52, and the suction pipe 51 is connected to the suction unit 54 via the connecting pipe 53. Preferably, the lower surface of the suction pipe 51 is provided with an air inlet hole to perform negative pressure traction on the surface of the substrate passing directly below it, thereby completing the cleaning treatment of the substrate surface. Preferably, the suction unit 54 can be installed on the suspended mounting plane defined by the support frame 2. Preferably, the suction unit 54 adopts a vacuum blower with a filter unit and a dust collection unit, which can generate negative pressure traction airflow to enter its inner cavity from the suction pipe 51. For example, it can be a wet and dry vacuum cleaner of model DL1500, which can be used by connecting the inlet of the vacuum cleaner to the connecting pipe 53. The length of the air inlet hole of the suction pipe 51 provided in this application is perpendicular to the translation direction of the base plate, and the length of the air inlet hole is greater than the width of the base plate, so that the suction width constructed therein can cover the base plate, and thus traverse the entire surface of the base plate when the base plate moves laterally, so as to effectively and fully cover the cleaning and dust removal of the base plate.

[0036] Preferably, the coating assembly 6 includes a second lifting rod 61, a storage tank 62, a discharge nozzle 63, a brush body 64, and a scraper 65. Preferably, the second lifting rod 61 is connected to the support frame 2, and its axial lower end is connected to the storage tank 62. Specifically, the storage tank 62 may store auxiliary adhesives such as solder paste. Preferably, the bottom of the storage tank 62 is staggered with discharge nozzles 63 that communicate with its internal cavity and are adjustable for material output. More preferably, a brush body 64 and a scraper 65 are also provided on the bottom surface of the storage tank 62. Specifically, the brush body 64 and the row of discharge nozzles 63 are staggered to evenly brush the material output from multiple points, thereby ensuring the uniformity of the coating. Specifically, the scraper 65 is connected to the bottom edge of the storage tank 62 in a manner that creates an inclined plate surface. Preferably, the nozzle shell 631 of the discharge nozzle 63 is inclinedly inserted into the bottom surface of the storage tank 62. More preferably, a deflector baffle 632 is rotatably connected to the lower opening edge of the nozzle 631 to block its opening, and a load adjustment block 633 is provided on the bottom surface of the deflector baffle 632 to limit its position. Specifically, the bottom surface of the load adjustment block 633 is lower than the top surface of the base plate driven by the conveyor belt 31, so that the load adjustment block 633 can rotate when in contact with the base plate, thereby causing the deflector baffle 632 to deflect. Thus, the deflector baffle 632 can block the lower opening of the nozzle 631, so that the material can be output under its own weight or pushed by the inward push structure of the storage box 62, thereby coating the surface of the base plate. During the lateral movement of the base plate, the brush body 64 can move in the opposite direction simultaneously to brush the material evenly. In addition, the scraper 65 located at the edge of the storage box 62 can scrape the coated material, further improving the coating uniformity and scraping some areas of excessively thick material to thinner areas, ensuring the flatness of the material layer.

[0037] Preferably, the third lifting rod 71 of the mounting assembly 7 suspends the deflection motor 72 and the deflection plate 73 above the conveying belt 31 in a liftable manner. Specifically, the deflection motor 72 can drive the deflection plate 73 to rotate. Further preferably, both ends of the deflection plate 73 are provided with a grabber suction cup 74 and a suction cylinder 75 in communication with the grabber suction cup 74. Preferably, the first lifting rod 52, the second lifting rod 61 and the third lifting rod 71 can be selected as an electric cylinder of model VDM90. Preferably, the suction cylinder 75 can change the volume of the cylinder cavity under the drive of the externally connected electric cylinder, so that the grabber suction cup 74 can suck and release electronic components. The deflection plate 73 provided in the application can drive the two oppositely arranged grabber suction cups 74 to perform deflection motion between the mounting station on the conveying belt 31 and the negative pressure suction station on the rotary feeding mechanism 4, so as to continuously transfer and position the mounted electronic components, thereby improving the speed and efficiency of mounting. It replaces the traditional manual patching operation, improves the continuity and accuracy of mounting, and controls the lifting movement and release of electronic components through a high-precision cylinder, thereby ensuring the stability and positioning accuracy of the mounting operation, avoiding problems such as mounting misalignment and slipping that affect the quality and performance of the mounting.

[0038] Preferably, the elastic limiting assembly 8 includes a limiting shell 81 oppositely arranged on the conveying belt 31, an abutting head 82, a buffer limiting spring 83 and an adjusting support 84. Preferably, the opposite surfaces of the two limiting shells 81 are movably inserted with the abutting head 82 capable of oppositely abutting and clamping the bottom plate. Preferably, one end of the abutting head 82 inserted into the limiting shell 81 is connected with the adjusting support 84 inserted into the limiting shell 81 through the buffer limiting spring 83, so as to change the initial spacing distance between the two oppositely arranged abutting heads 82 by changing the length of the adjusting support 84 inserted into the limiting shell 81, so as to adapt to various sizes of substrates, and then equivalently and stably clamp and position the substrates of different sizes. The abutting head 82 provided in the application can realize elastic opposite clamping of the substrate on the basis of the buffer limiting spring 83, avoid clamping damage caused by too strong rigid abutment, and the mutual cooperation of the abutting head 82, the buffer limiting spring 83 and the adjusting support 84 can adaptively clamp the substrates of various sizes. While ensuring the effectiveness of clamping, it can improve the equal force limiting clamping of substrates of various sizes, avoid the defects of excessive clamping damage and too small clamping that cannot guarantee stable limiting.

[0039] Preferably, the clamping limit plates 821 of the abutting head 82 are connected with the first bottom plate 823 in the limit casing 81 through the first movable insertion rod 822. Specifically, the clamping limit plates 821 are parallel to the first bottom plate 823. Preferably, an inclined slope is arranged on the abutting front end face of the clamping limit plate 821, so as to facilitate the base plate to be clamped between the two oppositely arranged clamping limit plates 821. Further preferably, an antiskid rubber layer is embedded on the abutting front end face of the clamping limit plate 821.

[0040] Preferably, the second bottom plate 841 of the adjusting support 84 is arranged in the limit casing 81 in a manner that it is parallel to the first bottom plate 823 and can push the first bottom plate 823 to synchronously translate. Preferably, the side of the second bottom plate 841 away from the first bottom plate 823 is provided with the guide sliding rod 842 and the threaded insertion rod 843 which are parallel to each other and pass through the shell wall of the limit casing 81. Further preferably, the guide sliding rod 842 is fixedly connected on the second bottom plate 841, and the rod body thereof further movably penetrates through the shell wall of the limit casing 81 to limit the moving direction of the second bottom plate 841. Preferably, the threaded insertion rod 843 is rotatably connected on the second bottom plate 841. Further preferably, the threaded insertion rod 843 is screwed on the shell wall of the limit casing 81, so that the length of the rod body of the threaded insertion rod 843 inserted into the limit casing 81 is changed by screwing the threaded insertion rod 843, and then the second bottom plate 841 is pushed to translate.

[0041] Preferably, the plurality of buffer limit springs 83 are arranged in the manner of equidistant side-by-side between the first bottom plate 823 and the second bottom plate 841, so that the buffer limit springs 83 can limit the relative position between the first bottom plate 823 and the second bottom plate 841.

[0042] The utility model is not limited to the above optional implementation, anyone can draw other various forms of product under the enlightenment of the utility model, but no matter make any change in its shape or structure, the technical scheme falling into the scope defined by the claims of the utility model, all fall into the protection scope of the utility model. The person skilled in the art should understand that the utility model specification and its drawings are all illustrative and not constitute the limitation of the claims. The protection scope of the utility model is defined by the claims and its equivalents. In the full text, the features guided by "preferably" are only an optional way, and should not be understood as necessarily setting, therefore the applicant reserves the right to abandon or delete the relevant preferred features at any time.

Claims

1. A PCB production base plate mounting equipment, comprising a supporting base (1) and a supporting frame (2) supported on the supporting base (1), characterized in that, a conveying mechanism (3) for directional conveying of base plates and a rotary feeding mechanism (4) for supplying electronic components to be mounted are supported on the supporting base (1); a pre-cleaning assembly (5), a coating assembly (6) and a mounting assembly (7) are arranged in zones on the supporting frame (2) along the base plate conveying direction defined by the conveying mechanism (3); adjustable elastic limiting assemblies (8) for aligning and clamping base plates are arranged at intervals on the conveying belt (31) of the conveying mechanism (3), wherein the elastic limiting assemblies (8) are matched with limiting bars (311) arranged at intervals on the belt body of the conveying belt (31) to limit the base plates.

2. The board mounting apparatus for producing a PCB according to claim 1, wherein The elastic limiting assembly (8) comprises a limiting shell (81) arranged in alignment on the conveying belt (31), an abutting head (82), a buffer limiting spring (83) and an adjusting support (84), wherein, the abutting head (82) capable of aligning and clamping the base plates is movably inserted into the opposite surfaces of the two limiting shells (81), and one end of the abutting head (82) inserted into the limiting shell (81) is connected with the adjusting support (84) through the buffer limiting spring (83).

3. The board mounting apparatus for producing a PCB according to claim 2, wherein The clamping limiting plate (821) of the abutting head (82) is connected with the first bottom plate (823) in the limiting shell (81) through the first movable insertion rod (822), and the clamping limiting plate (821) and the first bottom plate (823) are parallel to each other.

4. The board mounting apparatus for producing a PCB according to claim 3, wherein The second bottom plate (841) of the adjusting support (84) is arranged in the limiting shell (81) in a manner that it is parallel to the first bottom plate (823) and can push the first bottom plate (823) to move synchronously, a guiding slide rod (842) and a threaded insertion rod (843) are arranged on the shell wall of the limiting shell (81) on the side of the second bottom plate (841) away from the first bottom plate (823). A plurality of limiting bars (311) are installed on the conveying belt (31) in a manner that they have the same arrangement interval distance as the elastic limiting assemblies (8), 5. The board mounting apparatus for producing a PCB according to claim 4, wherein the limiting bars (311) are matched with the two aligningly arranged clamping limiting plates (821) to form an expandable limit structure and position the base plate. The coating assembly (6) comprises a second lifting rod (61), a storage tank (62), a discharge nozzle (63), a brush body (64) and a scraper (65), wherein, 6. The board mounting apparatus for producing a PCB according to claim 5, wherein the second lifting rod (61) is connected to the supporting frame (2), and the axial lower end thereof is connected with the storage tank (62); the discharge nozzle (63) is inserted and arranged in an array at the bottom of the storage tank (62), and the brush body (64) and the scraper (65) are further arranged on the bottom surface of the storage tank (62). ​ 7. The substrate mounting apparatus for a PCB production as claimed in claim 6, wherein The brush body (64) is staggered with the row of discharge nozzles (63), so as to brush the material output at multiple points; The scraper (65) is connected to the bottom edge of the storage box (62) in a way that a slanted surface is formed.

8. The board mounting apparatus for producing a PCB according to claim 7, wherein The nozzle shell (631) of the discharge nozzle (63) is obliquely inserted into the bottom surface of the storage box (62), and the lower end opening edge of the nozzle shell (631) is rotatably connected with a deflection baffle (632) capable of shielding the opening, and the bottom surface of the deflection baffle (632) is provided with a weight adjusting block (633) capable of limiting the working position.

9. The board mounting apparatus for producing a PCB according to Claim 8, wherein The dust suction pipe (51) of the pre-cleaning assembly (5) is connected to the support frame (2) through a first lifting rod (52), and the dust suction pipe (51) is communicated with a dust suction unit (54) through a communication pipe (53).

10. The board mounting apparatus for producing a PCB according to Claim 9, wherein The third lifting rod (71) of the mounting assembly (7) suspends a deflection motor (72) and a deflection plate (73) above the conveying belt (31) in a liftable manner, the deflection motor (72) can drive the deflection plate (73) to rotate, and the both ends of the deflection plate (73) are provided with a grabbing piece suction disc (74) and a suction cylinder (75) communicated with the grabbing piece suction disc (74).

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