Printed circuit board weighing device and built-in printed circuit board intermittent weighing apparatus

Abstract

The application provides a printed circuit board weighing device and an embedded printed circuit board intermittent weighing device. The device comprises a weighing table, a lifting assembly and a weighing lifting assembly. The lifting assembly comprises a lifting chassis and a lifting support. The lifting chassis is connected with the weighing table. The lifting support is connected with the lifting chassis. The lifting support has a roller accommodating space for accommodating at least one production line roller when weighing the printed circuit board. The weighing lifting assembly is connected with the weighing table and the lifting chassis respectively, and is used for lifting the lifting chassis. When the printed circuit board is weighed, the production line roller is embedded in the roller accommodating space, so that the lifting support is in contact with the printed circuit board, the printed circuit board is weighed conveniently, the production line of the printed circuit board does not need to be disconnected for weighing, and the production cost of the printed circuit board is effectively reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of circuit board weighing, in particular to a printed circuit board weighing device and an intermittent printed circuit board weighing equipment. BACKGROUND

[0002] In the PCB manufacturing process, in order to monitor the actual copper amount of the PCB copper plating process in real time, such as the two processes of copper plating and full plate thickening, so as to evaluate the copper plating production efficiency and process quality, it is necessary to weigh the PCB in real time, and the weight value precision is generally required to be ±0.1g, and the special requirement (small area plate) is ±0.01g. Each copper plating process corresponds to two weighings, before and after the process, and the difference between the two is the actual copper amount of the process. According to the PCB full plate area and the effective area, the actual copper amount should be controlled within a specified range, and exceeding or insufficient indicates that the process quality is poor.

[0003] The current high-precision electronic scale technology has fully met the PCB weighing precision requirement, and according to the PCB weight (usually less than 3.5kg), the available electronic scales are two kinds: ① range 10kg / precision ±0.1g, ② range 10kg / precision ±0.01g (for small area PCB). In the enterprise production workshop, the actual operation of the PCB weighing usually adopts the offline sampling manual weighing method, and the technician takes a PCB plate from the production line, places it on the high-precision electronic scale for weighing, manually reads and records the weight value, and then puts the PCB back to the production line. For the PCB online weighing, there are two kinds of actualized flow line automatic weighing scales: roller scale and belt scale, and the basic structure is to place the metering roller or belt on the electronic weighing sensor.

[0004] However, the installation of the roller scale or the belt scale is embedded, that is, the PCB production line needs to be disconnected, and the disconnected part is embedded with the roller scale or the belt scale, so that the PCB production cost is too high, and it cannot be applied to the existing PCB production line. SUMMARY

[0005] The purpose of the present application is to overcome the deficiencies in the prior art, and to provide a printed circuit board weighing device and an intermittent printed circuit board weighing equipment which effectively reduces the production cost.

[0006] The purpose of the present application is achieved by the following technical scheme:

[0007] A printed circuit board weighing device, comprising a weighing table, a lifting assembly and a weighing lifting assembly; the weighing table is used for weighing the weight of a printed circuit board; the lifting assembly comprises a lifting chassis and a lifting support, the lifting chassis is connected with the weighing table, the lifting support is connected with the lifting chassis, the lifting support is located on the side of the lifting chassis away from the weighing table, the lifting support has a roller receiving space for receiving at least one production line roller when the printed circuit board is weighed; the weighing lifting assembly is connected with the weighing table and the lifting chassis respectively, and is used for lifting the lifting chassis away from or close to the weighing table.

[0008] In one of the embodiments, the lifting support comprises at least two first brackets connected with the lifting chassis, the roller receiving space is formed between the at least two first brackets, and the at least two first brackets abut against the printed circuit board.

[0009] In one of the embodiments, the at least two first brackets are symmetrically arranged with each other.

[0010] In one of the embodiments, each of the first brackets has a lifting support surface, and each of the lifting support surfaces is arranged in parallel with the printed circuit board.

[0011] In one of the embodiments, the lifting support further comprises at least one second bracket connected with the lifting chassis, the at least one second bracket is arranged between the at least two first brackets, and the at least one second bracket is used for abutting against the printed circuit board.

[0012] In one of the embodiments, the second bracket is arranged in flush with the first bracket.

[0013] In one of the embodiments, the at least two first brackets and the at least one second bracket are arranged at equal intervals.

[0014] In one of the embodiments, the weighing table comprises a weighing base and a weighing sensor connected with each other, the weighing sensor is connected with the lifting chassis, and the weighing sensor is used for sensing the weight of the printed circuit board.

[0015] In one of the embodiments, the weighing base is provided with a mounting groove, and the weighing sensor is clamped in the mounting groove.

[0016] An internal printed circuit board intermittent weighing device, comprising the printed circuit board weighing device according to any one of the above embodiments.

[0017] Compared with the prior art, the present application has at least the following advantages:

[0018] The roller accommodating space corresponds to and accommodates the production line roller, so that when the printed circuit board is weighed, the production line roller is placed in the roller accommodating space, so that the lifting support is in contact with the printed circuit board, facilitating the weighing of the printed circuit board, without the need to disconnect the production line of the printed circuit board for weighing, i.e. without the need to change the structure of the original production line, effectively reducing the modification cost of the production line, thereby effectively reducing the production cost of the printed circuit board. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0020] Figure 1 Fig. 1 is a schematic view of a printed circuit board weighing device in an embodiment;

[0021] Figure 2 Fig. 2 is a schematic view of a weighing lifting assembly in the printed circuit board weighing device shown in Fig. 1. Figure 1 Fig. 2 is a schematic view of a weighing lifting assembly in the printed circuit board weighing device shown in Fig. 1. DETAILED DESCRIPTION

[0022] In order to facilitate the understanding of the present application, the following will make a more comprehensive description of the present application with reference to the related drawings. The preferred embodiments of the present application are shown in the drawings. However, the present application can be realized in many different forms, and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0023] It should be noted that when an element is referred to as being "fixed" to another element, it can be directly on the other element or there can be an intervening element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or there can be an intervening element. The terms "vertical", "horizontal", "left", "right", and similar expressions used herein are for illustrative purposes only and are not intended to be limiting.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0025] The present application relates to a printed circuit board weighing device. In one embodiment, the printed circuit board weighing device comprises a weighing platform, a lifting assembly and a weighing lifting assembly. The weighing platform is used to weigh the weight of the printed circuit board. The lifting assembly comprises a lifting chassis and a lifting support. The lifting chassis is connected to the weighing platform. The lifting support is connected to the lifting chassis, and the lifting support is located on the side of the lifting chassis away from the weighing platform. The lifting support has a roller receiving space for receiving at least one production line roller when the printed circuit board is weighed. The weighing lifting assembly is connected to the weighing platform and the lifting chassis respectively, and the weighing lifting assembly is used to lift the lifting chassis away from or close to the weighing platform. The roller receiving space corresponds to and receives the production line roller, so that the production line roller is built into the roller receiving space when the printed circuit board is weighed, so that the lifting support is in contact with the printed circuit board, facilitating the weighing of the printed circuit board, without the need to disconnect the production line of the printed circuit board for weighing, i.e. without the need to change the structure of the original production line, effectively reducing the modification cost of the production line, thereby effectively reducing the production cost of the printed circuit board.

[0026] Please refer to Figure 1 which is a structural schematic diagram of the printed circuit board weighing device according to an embodiment of the present application.

[0027] The printed circuit board weighing device 10 according to one embodiment comprises a weighing platform 100, a lifting assembly 200 and a weighing lifting assembly 300. The weighing platform 100 is used to weigh the weight of the printed circuit board. The lifting assembly 200 comprises a lifting chassis 210 and a lifting support 220. The lifting chassis 210 is connected to the weighing platform 100. The lifting support 220 is connected to the lifting chassis 210, and the lifting support 220 is located on the side of the lifting chassis 210 away from the weighing platform 100. The lifting support 220 has a roller receiving space 202 for receiving at least one production line roller when the printed circuit board is weighed. The weighing lifting assembly 300 is connected to the weighing platform 100 and the lifting chassis 210 respectively, and the weighing lifting assembly 300 is used to lift the lifting chassis 210 away from or close to the weighing platform 100.

[0028] In the embodiment, the roller accommodating space 202 corresponds to and accommodates the production line roller, so that when the printed circuit board is weighed, the production line roller is built into the roller accommodating space 202, so that the lifting support 220 is in contact with the printed circuit board, facilitating the weighing of the printed circuit board, without the need to disconnect the production line of the printed circuit board for weighing, that is, without the need to change the structure of the original production line, effectively reducing the modification cost of the production line, thereby effectively reducing the production cost of the printed circuit board. Wherein, when weighing, the weighing lifting assembly 300 is lifted, that is, the weighing lifting assembly 300 drives the lifting chassis 210 to move away from the weighing table 100, so that the production line roller is completely built into the roller accommodating space 202, and the lifting support 220 is higher than the production line roller, so that the lifting support 220 is in contact with the printed circuit board, and the printed circuit board is lifted, so as to facilitate the weighing of the printed circuit board; after weighing, the weighing lifting assembly 300 is lowered, that is, the weighing lifting assembly 300 drives the lifting chassis 210 to move close to the weighing table 100, so that at least part of the production line roller is located outside the roller accommodating space 202, so that the lifting support 220 is lower than the production line roller, and the lifting support 220 is in contact with the printed circuit board, facilitating the transportation of the printed circuit board after the weighing of the production line roller.

[0029] In one of the embodiments, referring to Figure 1 , the lifting support 220 comprises at least two first brackets 230 connected with the lifting chassis 210, and the roller accommodating space 202 is formed between the at least two first brackets 230, and the at least two first brackets 230 abut against the printed circuit board. In the embodiment, the first bracket 230 is in contact with the lifting chassis 210 and the printed circuit board respectively, that is, one side of the first bracket 230 is connected with the lifting chassis 210, and the other side of the first bracket 230 is used to support and lift the printed circuit board, facilitating the weighing of the printed circuit board by the weighing table 100 through the first bracket 230. The arrangement of the at least two first brackets 230 improves the weighing stability of the printed circuit board on the printed circuit board weighing device, and the roller accommodating space 202 is located between the at least two first brackets 230, facilitating the accommodation of the production line roller between the at least two first brackets 230, realizing the mutual embedding of the production line roller and the first bracket 230, that is, the first bracket 230 passes through the gap between the production line rollers, facilitating the weighing of the printed circuit board without disconnecting the production line.

[0030] Further, the first bracket 230 is symmetrically arranged with respect to each other. In this embodiment, the first bracket 230 is used to contact the printed circuit board, the first bracket 230 holds the printed circuit board, the first bracket 230 is used as a holding support component of the printed circuit board, and the first bracket 230 provides a holding support force for the printed circuit board. The first bracket 230 is symmetrically arranged with respect to each other, which facilitates supporting both ends of the printed circuit board, so that the printed circuit board is uniformly supported, and the stability of the printed circuit board on the printed circuit board weighing device is further improved.

[0031] Further, each first bracket 230 has a holding support surface, and each holding support surface is arranged in parallel with respect to the printed circuit board. In this embodiment, the holding support surface is a support surface on the first bracket 230, the holding support surface is used to support the printed circuit board, and the holding support surface is located on a side of the first bracket 230 away from the lifting base. When the printed circuit board is weighed, the holding support surface is in contact with the surface of the printed circuit board, and each holding support surface is arranged in parallel with respect to the printed circuit board, so that the printed circuit board and each first bracket 230 are kept parallel to each other, thereby making the printed circuit board stable on the printed circuit board weighing device.

[0032] Further, referring to Figure 1 , the lifting support 220 further comprises at least one second bracket 240 connected to the lifting base 210, at least one second bracket 240 is arranged between at least two first brackets 230, and at least one second bracket 240 is used to abut against the printed circuit board. In this embodiment, the second bracket 240 is located between at least two first brackets 230, the second bracket 240 is used as an auxiliary bracket for holding and supporting the printed circuit board, and the second bracket 240 and the first bracket 230 jointly support the printed circuit board, so that the printed circuit board is more stable on the printed circuit board weighing device. In another embodiment, a space for accommodating a production line roller is formed between the second bracket 240 and the first bracket 230.

[0033] Further, the second bracket 240 is arranged flush with the first bracket 230. In the embodiment, the second bracket 240 and the first bracket 230 are both in contact with the printed circuit board, that is, the second bracket 240 and the first bracket 230 are both in abutment with the same surface of the printed circuit board, that is, the second bracket 240 and the first bracket 230 are both supported on the bottom of the printed circuit board. The second bracket 240 and the first bracket 230 are arranged flush with each other, so that the second bracket 240 and the first bracket 230 not only remain parallel to each other, but also protrude from the lifting base 210 to the same height, further improving the stability of the printed circuit board on the printed circuit board weighing device.

[0034] In another embodiment, at least two first brackets 230 and at least one second bracket 240 are arranged at equal intervals, so that the first brackets 230 and the second brackets 240 are uniformly distributed, so that the lifting support force received by the printed circuit board is uniformly distributed, further improving the stability of the printed circuit board on the printed circuit board weighing device.

[0035] In one of the embodiments, referring to Figure 1 The weighing table 100 comprises a weighing base 110 and a weighing sensor 120 connected to each other, the weighing sensor 120 is connected to the lifting base 210, and the weighing sensor 120 is used to sense the weight of the printed circuit board. In the embodiment, the weighing base 110 serves as the mounting base of the weighing sensor 120, and the weighing sensor 120 is arranged based on the weighing base 110. Specifically, the area of the weighing base 110 is larger than the area of the weighing sensor 120, so as to provide sufficient support force for the weighing sensor 120. The weighing sensor 120 senses the weight of the printed circuit board through the lifting base 210, so as to realize accurate weighing of the printed circuit board.

[0036] Further, referring to Figure 1 The weighing base 110 is provided with a mounting groove 102, and the weighing sensor 120 is clamped in the mounting groove 102. In the embodiment, the mounting groove 102 is located on the weighing base 110, and the opening of the mounting groove 102 faces the lifting base 210, so as to accommodate part of the weighing sensor 120, so that part of the weighing sensor 120 is embedded in the weighing base 110, so as to improve the mounting stability between the weighing sensor 120 and the weighing base 110.

[0037] It can be understood that when the printed circuit board is weighed, it needs to be weighed by the weighing lifting assembly 300, and the traditional lifting device has an electric push rod type (patent application number CN202111214464.9, patent application number CN202120772848.1), a gas / liquid cylinder push rod type (patent application number CN202010411191.6) and a gravity sliding type (patent application number CN202010475591.3). The push rod type is generally slow, the device is heavy, and the sliding type has a height difference, which are not suitable for PCB online weighing.

[0038] In order to weigh quickly, that is, to improve the weighing efficiency of the printed circuit board, please refer to Figure 2 The weighing lifting assembly 300 includes a rocker 310, a crank 320 and a rotating motor 330. The rocker 310 is connected with the lifting chassis 210. The crank 320 includes a crankshaft 322, a crank body 324 and a crank end rod 326 connected in sequence. The crankshaft 322 is connected with the rotating shaft of the rotating motor 330. The crank body 324 and the crank end rod 326 are both formed with an included angle. The crank end rod 326 is connected with the rocker 310. The rotating motor 330 is used to rotate the crankshaft 322, so that the crank end rod 326 is away from or close to the weighing table 100.

[0039] In the embodiment, the rocker 310 drags the crank 320, and the rocker 310 directionally guides the rotation of the crank 320, that is, under the driving of the rotating motor 330, the crank 320 rotates, and the rocker 310 moves along with the crank 320. Specifically, when the printed circuit board is weighed, the rotating shaft of the rotating motor 330 rotates forward by a specified angle to drive the crankshaft 322 to rotate, so that the crank end rod 326 rotates around the crankshaft 322 as the center axis, thereby making the crank end rod 326 gradually move away from the weighing table 100, and further making the rocker 310 lift the lifting base 210, so as to facilitate the contact between the lifting support 220 and the printed circuit board. After the weighing is completed, the rotating shaft of the rotating motor 330 reversely rotates by the same angle, so that the crank end rod 326 reversely rotates around the crankshaft 322 as the center axis, thereby making the crank end rod 326 gradually move close to the weighing table 100, and further making the rocker 310 lower the lifting base 210, so as to facilitate the disengagement between the lifting support 220 and the printed circuit board. The rotating operation of the rotating shaft of the rotating motor 330 can be controlled according to actual needs, and the rotating angle can be set to 90°, so as to facilitate the determination of the lifting time during weighing according to the angular velocity of the rotating motor 330, for example, the rotating angle of the rotating motor 330 during lifting and lowering is controlled by PLC. In another embodiment, in order to facilitate the lifting of the rocker 310, the rocker 310 is rotationally connected with the lifting base 210, and the crankshaft 322 and the crank end rod 326 are arranged in parallel with each other, and the crank body 324 is arranged perpendicularly to the crankshaft 322 and the crank end rod 326.

[0040] Further, please refer to Figure 2 The weighing and lifting assembly 300 further comprises a limiting plate 328 arranged on the weighing table 100, the limiting plate 328 is arranged opposite to the crank end rod 326, and the limiting plate 328 is used to abut against the crank end rod 326 during weighing.

[0041] In the embodiment, the limiting plate 328 is a limiting and blocking component of the crank handle 326, and is located on the side of the crank shaft 322 away from the crank handle 326. When the printed circuit board is weighed, the rotating shaft of the rotating motor 330 is positively rotated by a specified angle to drive the crank shaft 322 to rotate, so that the crank handle 326 rotates around the crank shaft 322 as the central axis. When the crank handle 326 rotates to the position farthest away from the weighing table 100, the limiting plate 328 blocks the rotation of the crank handle 326, ensuring that the crank handle 326 rotates to the limit point, so as to ensure that the crank handle 326 completely lifts the lifting base 210, facilitating the weighing of the printed circuit board. In another embodiment, the limiting plate 328 is arranged perpendicularly to the weighing table 100.

[0042] Further, referring to Figure 2 , the weighing and lifting assembly 300 further comprises a crank 321, a crank seat 323 and a single-row angular ball bearing 325. The crank seat 323 is arranged on the weighing table 100, the crank 321 is connected with the crank seat 323, the crank 321 is further connected with the inner ring of the single-row angular ball bearing 325, the connecting point of the crank 321 and the crank seat 323 is located on the extension line of the crank shaft 322, the outer ring of the single-row angular ball bearing 325 is connected with the rocker 310, the crank handle 326 is arranged in the inner ring of the single-row angular ball bearing 325, specifically, the diameter of the crank handle 326 is smaller than the inner diameter of the inner ring of the single-row angular ball bearing 325, so that the gap between the crank handle 326 and the inner wall of the inner ring of the single-row angular ball bearing 325 is greater than the maximum allowable deformation of the weighing sensor 120.

[0043] In the embodiment, the crank 321 rotates around the crank base 323, and the connecting point of the crank 321 and the crank base 323 is flush with the crankshaft 322, so that when the crankshaft 322 rotates, the crank 321 rotates around the crankshaft 322, facilitating lifting of the single-row angular contact ball bearing 325. The inner ring of the single-row angular contact ball bearing 325 is connected with the crank 321, and the outer ring of the single-row angular contact ball bearing 325 is connected with the rocker 310. During lifting of the single-row angular contact ball bearing 325, the single-row angular contact ball bearing 325 acts as a rotating bearing between the crank 321 and the rocker 310, facilitating stable connection of the crank 321 and the rocker 310, improving smoothness of the crank 321 and the rocker 310 during lifting, and effectively reducing the fracture probability of the crank 321 and the rocker 310. In this way, the rotating motor 330 can be arranged outside the printed circuit board weighing device, and after the crank handle end rod 326 rotates to the highest position, it is rotated by a small angle to make the crank handle end rod 326 disengage from the inner ring of the single-row angular contact ball bearing 325, thereby reducing the influence of the crank handle end rod 326 on weighing and improving the weighing accuracy of the printed circuit board. In another embodiment, the weighing and lifting assembly 300 further comprises a buffer pad 327 arranged on the weighing table 100, and the buffer pad 327 elastically abuts against the single-row angular contact ball bearing 325 to reduce the impact force received by the single-row angular contact ball bearing 325 during descending.

[0044] Further, referring to Figure 1 , the weighing and lifting assembly 300 further comprises a linear bearing 340 and a linear guide shaft 350, the linear bearing 340 is slidingly sleeved on the linear guide shaft 350, the linear bearing 340 is further connected with the lifting base 210, and the linear guide shaft 350 is vertically arranged on the weighing table 100.

[0045] In the embodiment, the linear bearing 340 is slidingly arranged on the linear guide shaft 350, and during lifting of the lifting base 210, the linear bearing 340 limits the lifting direction of the lifting base 210, ensuring that the lifting base 210 moves in a direction perpendicular to the weighing table 100, avoiding deviation of the lifting base 210, and thereby avoiding collision between the lifting support 220 and the production line roller.

[0046] In another embodiment, referring to Figure 1The printed circuit board weighing device 10 further comprises a bottom longitudinal plate 400, and the weighing lifting assembly 300 is connected with the weighing platform 100 through the bottom longitudinal plate 400. The bottom longitudinal plate 400 serves as a partition between the weighing lifting assembly 300 and the weighing platform 100, and provides sufficient installation space for the weighing lifting assembly 300. Meanwhile, the bottom longitudinal plate 400 facilitates one-time installation of the weighing lifting assembly 300 and the lifting assembly 200 on the weighing platform 100, thereby improving the installation efficiency of the printed circuit board weighing device.

[0047] In one of the embodiments, the application further provides an internal printed circuit board intermittent weighing device comprising the printed circuit board weighing device according to any one of the above embodiments. In this embodiment, the printed circuit board weighing device comprises a weighing platform, a lifting assembly and a weighing lifting assembly. The weighing platform is used to weigh the printed circuit board. The lifting assembly comprises a lifting base and a lifting support. The lifting base is connected with the weighing platform. The lifting support is connected with the lifting base and located on the side of the lifting base away from the weighing platform. The lifting support has a roller receiving space used to receive at least one production line roller when the printed circuit board is weighed. The weighing lifting assembly is connected with the weighing platform and the lifting base respectively, and is used to lift the lifting base to move the lifting base away from or close to the weighing platform. The roller receiving space corresponds to and receives the production line roller, so that the production line roller is internally placed in the roller receiving space when the printed circuit board is weighed, and the lifting support is in contact with the printed circuit board, thereby facilitating the weighing of the printed circuit board without disconnecting the production line of the printed circuit board for weighing, i.e. without changing the structure of the original production line, thereby effectively reducing the modification cost of the production line and the production cost of the printed circuit board. In this embodiment, the internal printed circuit board intermittent weighing device further comprises an infrared detector used to detect whether the printed circuit board is placed on the lifting support to determine whether the printed circuit board is weighed.

[0048] The above embodiments only express several embodiments of the application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the scope of the patent. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the application, several modifications and improvements can be made, which are within the scope of the application. Therefore, the scope of the patent of the application should be subject to the appended claims.

Claims

1. A printed circuit board weighing device, characterized in that, include: A weighing platform, used for weighing the printed circuit board; A lifting assembly includes a lifting base and a lifting support. The lifting base is connected to the weighing platform, and the lifting support is connected to the lifting base. The lifting support is located on the side of the lifting base away from the weighing platform. The lifting support has a roller receiving space for accommodating at least one production line roller when weighing the printed circuit board. A weighing lifting assembly is provided, which is connected to both the weighing platform and the lifting base. The weighing lifting assembly is used to raise and lower the lifting base to move it away from or closer to the weighing platform. The weighing lifting assembly includes a rocker arm, a crank, and a rotary motor. The rocker arm is connected to the lifting base. The crank includes a crankshaft, a crank body, and a crank end rod connected in sequence. The crankshaft is connected to the rotating shaft of the rotary motor. The crank body forms an angle with both the crankshaft and the crank end rod. The crank end rod is connected to the rocker arm. The rotary motor is used to rotate the crankshaft to move the crank end rod away from or closer to the weighing platform. The weighing lifting assembly further includes a limiting plate, a crank, a crank seat, and a single-row radial ball bearing. The limiting plate is disposed on the weighing platform and is opposite to the crank end rod. The limiting plate is used to abut against the crank end rod during weighing. The crank seat is disposed on the weighing platform and is connected to the crank seat. The crank is also connected to the inner ring of the single-row radial ball bearing. The connection point between the crank and the crank seat is located on the extension line of the crankshaft. The outer ring of the single-row radial ball bearing is connected to the rocker arm. The crank end rod passes through the inner ring of the single-row radial ball bearing. The diameter of the crank end rod is smaller than the inner diameter of the inner ring of the single-row radial ball bearing, so that the gap between the crank end rod and the inner wall of the inner ring of the single-row radial ball bearing is greater than the maximum allowable deformation of the load cell.

2. The printed circuit board weighing device according to claim 1, characterized in that, The lifting support includes at least two first brackets connected to the lifting base frame, a roller receiving space is formed between the at least two first brackets, and the at least two first brackets abut against the printed circuit board.

3. The printed circuit board weighing device according to claim 2, characterized in that, At least two of the first brackets are arranged symmetrically to each other.

4. The printed circuit board weighing device according to claim 2, characterized in that, Each of the first brackets has a support surface, and each support surface is arranged parallel to the printed circuit board.

5. The printed circuit board weighing device according to claim 2, characterized in that, The lifting support also includes at least one second bracket connected to the lifting base frame, the at least one second bracket being disposed between at least two first brackets, and the at least one second bracket being used to abut against the printed circuit board.

6. The printed circuit board weighing device according to claim 5, characterized in that, The second bracket is flush with the first bracket.

7. The printed circuit board weighing device according to claim 5, characterized in that, At least two of the first brackets are arranged at equal intervals with at least one of the second brackets.

8. The printed circuit board weighing device according to claim 1, characterized in that, The weighing platform includes a weighing base and a weighing sensor connected to each other. The weighing sensor is connected to the supporting frame and is used to sense the weight of the printed circuit board.

9. The printed circuit board weighing device according to claim 8, characterized in that, The weighing base has a mounting slot, and the weighing sensor is installed in the mounting slot.

10. A built-in intermittent weighing device for printed circuit boards, characterized in that, The printed circuit board weighing device includes any one of claims 1 to 9.

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