A multi-specification elongated steel pipe on-line weighing device

Abstract

The utility model discloses a kind of multi-specification slender steel pipe online weighing devices, including being set on production line transfer equipment and with several electronic weighing devices of weighing control system connection, several electronic weighing devices are independently set and synchronous lifting, the electronic weighing device includes electronic scale and is set on electronic scale electronic scale jacking mechanism.This multi-specification slender steel pipe online weighing device, using multiple electronic weighing device multi-point support jacking weighing, so that multi-specification slender steel pipe completes net weight weighing from roll way machine, weighing precision is high, steel pipe will not be damaged, production efficiency is high;Using scissor type lifting mechanism jacking weighing, the supporting surface of support platform parallel lifting, working condition is stable, can effectively reduce the eccentric load of electronic scale, improve measurement accuracy;Multiple electronic weighing device synchronous jacking steel pipe and independently load-bearing stress, weighing control system will automatically accumulate the weight of each electronic weighing device, and on-line display cumulative weight.

Description

Technical Field

[0001] This utility model relates to the field of weighing device technology, and in particular to an online weighing device for multi-specification slender steel pipes. Background Technology

[0002] Currently, steel pipe manufacturers need to weigh steel pipes during production for easier management and control. However, for larger diameter steel pipes, offline weighing using a crane scale is generally used, which raises concerns about production efficiency and safety. Therefore, online automatic weighing has become the preferred option for manufacturers.

[0003] For example, Chinese patent document CN 209858035U discloses an online automatic weighing device for stainless steel pipes. It includes stainless steel pipe conveying rollers spaced apart and a weighing mechanism disposed between the rollers. The weighing mechanism includes a steel pipe frame for placing the stainless steel pipes and a support plate disposed at the bottom of the steel pipe frame. A pressure sensor is disposed between the steel pipe frame and the support plate. A lifting mechanism is disposed at the bottom of the support plate, with the lifting mechanism located near both ends of the support plate. The steel pipe frame has through holes for the stainless steel pipe conveying rollers to pass through, and the through holes penetrate both the steel pipe frame and the support plate.

[0004] Although the above technical solution achieves online automatic weighing, the online weighing device it uses relies on a support plate and lifting mechanisms at both ends to achieve support and weighing. Its applicable steel pipe length is only sufficient for weighing steel pipes that exceed the limited length of the support plate, and it still cannot be applied to the weighing of slender steel pipes.

[0005] Because ultra-long, small-diameter steel pipes have small diameters and large lengths (e.g., a steel pipe with a diameter of ∅12mm and a length of 40 meters), they are often lifted or supported at single or double points. Due to gravity, they tend to bend severely. This can cause two problems: firstly, the slender steel pipes may bend downwards, causing the pipe diameter to collapse and damaging the pipe; secondly, it makes accurate weighing impossible.

[0006] Therefore, in order to address the problem of difficulty in weighing slender steel pipes in existing technologies, an online weighing system was designed for production lines. This system is suitable for the accurate weighing of slender steel pipes of various specifications, lengths, and diameters. Moreover, it has a simple structure, high production efficiency, stable weighing, and high measurement accuracy. Utility Model Content

[0007] The purpose of this invention is to solve the problems of existing single-point or double-point lifting or support weighing of slender steel pipes, which result in severe deflection and bending under gravity, inaccurate weighing, easy damage to the pipes, and inconvenient operation. The invention provides an online automatic weighing device for slender steel pipes of various specifications, which eliminates the need for lifting, achieves multi-point parallel lifting and support, has a simple structure, is easy to operate, has good weighing stability, high measurement accuracy, and can effectively improve production efficiency.

[0008] The technical solution adopted by this utility model to achieve its utility model objective is: an online weighing device for multi-specification slender steel pipes, including several electronic weighing devices installed on the production line transfer equipment and connected to a weighing control system. These electronic weighing devices are independently set up and synchronously raised and lowered. Each electronic weighing device includes an electronic scale and an electronic scale lifting mechanism mounted on the scale. This online weighing device for multi-specification slender steel pipes, by installing several electronic weighing devices controlled by a weighing control system on the transfer equipment, and by independently setting up and synchronously raising and lowering these devices, forms a multi-point lifting support for multiple electronic weighing devices through the electronic scale and its lifting mechanism. This synchronously lifts slender steel pipes of the same or different specifications, allowing them to be weighed online after being removed from the transfer equipment. After weighing, the electronic weighing devices descend, and the slender steel pipes are transported online to the next process. The operation is convenient and efficient, without damaging the steel pipes, and achieves online weighing, greatly improving production efficiency. More importantly, several independently set electronic weighing devices are synchronously lifted, enabling the simultaneous weighing of slender steel pipes of various specifications. Different sizes of slender steel pipes can be weighed using varying numbers of electronic weighing devices, and the weighing data is independently transmitted to the weighing control system for automatic accumulation and display. This achieves accurate weighing, good stability, and will not damage the slender steel pipes, resulting in highly efficient weighing.

[0009] Preferably, the electronic scale includes a weighing platform and a weight sensor installed inside the weighing platform. Each electronic weighing device forms a parallel beam sensor integral structure, and several electronic weighing devices form a multi-point support lifting weighing system. The design of the weighing platform and weight sensor in the electronic scale enables the formation of a parallel beam sensor integral structure, resulting in good stability and improved measurement accuracy of a single electronic scale, thereby reducing measurement errors in the integrated weighing system of multiple scales.

[0010] Preferably, the electronic scale lifting mechanism includes a scissor mechanism and a power unit for driving the scissor mechanism to lift and lower. The electronic scale lifting mechanism uses a scissor mechanism, allowing the force-bearing support surface of the electronic weighing device to lift and lower parallel, ensuring unobstructed trajectory movement, and exhibiting a simple, reliable, and highly stable structure.

[0011] Preferably, the scissor lift mechanism includes a scissor lift assembly and a support platform disposed on the upper end of the scissor lift assembly, wherein a wear-resistant lifting bracket is provided on the support platform. The wear-resistant lifting bracket on the support platform provides good load-bearing capacity, excellent wear resistance, and a long service life, while also preventing damage to the steel pipe support surface on the support platform and thus preventing damage to the steel pipe itself.

[0012] Preferably, the scissor lift assembly includes a scissor lift slide, a linear roller assembly, and a scissor lift rod. A groove is provided on the scissor lift slide, and the linear roller assembly is slidably connected to the groove. Using the linear roller assembly to slide and achieve the lifting and lowering of the scissor lift rod provides good stability.

[0013] Preferably, the linear roller assembly includes a lower linear roller assembly and an upper linear roller assembly; the scissor lift slide includes a lower scissor lift slide and an upper scissor lift slide; and the scissor lift has at least one stage, with each stage including a first scissor lift and a second scissor lift that are hinged together.

[0014] Preferably, the linear roller assembly includes a roller drive shaft and rollers disposed at both ends of the roller drive shaft.

[0015] Preferably, the power unit is pneumatically driven, hydraulically driven, or electrically driven. The power unit can be selected and configured according to the magnitude of the driving force, etc., and can be pneumatically driven, hydraulically driven, or electrically driven, etc.

[0016] Preferably, the transfer equipment includes a transfer vehicle body and an overhead powered roller conveyor mounted on the transfer vehicle body.

[0017] Preferably, the top-mounted powered roller conveyor includes a roller conveyor frame, several horizontally arranged rollers on the track frame, and a drive device for rotating the rollers; roller conveying intervals are provided between the rollers; and the electronic weighing devices are installed on the transfer body where the conveying intervals are located. Several electronic weighing devices are installed within the roller intervals of the top-mounted powered roller conveyor on the transfer vehicle. When the steel pipes are conveyed online to a fixed position on the top-mounted powered roller conveyor, the electronic weighing devices are activated to synchronously lift the slender steel pipes on the roller conveyor, achieving online weighing. This ensures that slender steel pipes of various specifications are completely detached from the roller conveyor for net weight weighing, avoiding contact between the lifting support and the roller conveyor, which would affect weighing. This net weight weighing method ensures high weighing accuracy.

[0018] The beneficial effects of this utility model are as follows: This online weighing device for multi-specification slender steel pipes uses multiple electronic weighing devices with multi-point support for lifting and weighing, enabling the multi-specification slender steel pipes to be weighed net weight after being removed from the roller conveyor. The weighing accuracy is high, the steel pipes are not damaged, and the production efficiency is high. The scissor-type lifting mechanism is used for lifting and weighing, and the support surface of the support platform rises and falls in parallel, resulting in stable operation and effectively reducing the off-center load of the electronic scale, thus improving the measurement accuracy. Multiple electronic weighing devices lift the steel pipes synchronously and bear the load independently. The weighing control system automatically accumulates the weight of each electronic weighing device and displays the accumulated weight online. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of a multi-specification slender steel pipe online weighing device according to this utility model.

[0020] Figure 2 A side view of the multi-specification slender steel pipe online weighing device of Zhongben Utility Model.

[0021] Figure 3 This is a schematic diagram of the structure of an electronic weighing device in this utility model.

[0022] Figure 4 This is a side view of the electronic weighing device in this utility model.

[0023] Figure 5 This is an application structural diagram of the online weighing device for multi-specification slender steel pipes of this utility model.

[0024] Figure 6 This is a schematic diagram of the lifting state structure of the online weighing device for multi-specification slender steel pipes of this utility model.

[0025] Figure 7 This is a side view of the lifting state of the online weighing device for multi-specification slender steel pipes of this utility model.

[0026] In the diagram: 100, transfer equipment; 101, transfer vehicle body; 102, top-mounted powered roller conveyor; 103, roller; 104, roller conveyor interval; 105, roller conveyor frame. 200. Slender steel pipe to be weighed. 1. Online weighing device for multi-specification slender steel pipes; 2. Electronic weighing device; 3. Weighing control system; 4. Electronic scale; 41. Weighing platform; 42. Weight sensor; 5. Electronic scale lifting mechanism; 6. Scissor lift mechanism; 7. Power unit; 71. Drive cylinder; 72. Piston rod; 73. Piston rod hinge joint; 74. Cylinder mounting bracket. 8. Scissor lift assembly; 81. Scissor lift slide; 811. Lower scissor lift slide; 812. Upper scissor lift slide; 82. Linear roller assembly; 821. Upper linear roller assembly; 822. Lower linear roller assembly; 823. Roller drive shaft; 824. Roller; 83. Scissor bar; 831. First scissor bar; 832. Second scissor bar; 84. Slide groove; 85. Scissor lift shaft; 86. Upper hinge seat; 87. Lower hinge seat; 9. Support platform; 10. Lifting bracket; 11. Lifting bracket guard plate; 12. Guard plate guide surface. Detailed Implementation

[0027] The technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Components not specifically described in this utility model are existing components or general components, and control systems, control methods, related algorithms, parameters, etc. not specifically described all adopt existing technologies.

[0028] Example 1: See Figure 1 , Figure 2 In the illustrated embodiment, an online weighing device for multi-specification slender steel pipes is suitable for locations requiring weighing of slender steel pipes, such as slender steel pipe production lines or slender steel pipe transfer systems. Its purpose is to achieve convenient, fast, and accurate online weighing of slender steel pipes. It is mainly applicable to slender steel pipes 200 with lengths ranging from 12m to 40m and diameters from ∅12mm to ∅45mm.

[0029] An online weighing device for multi-specification slender steel pipes includes several electronic weighing devices 2 installed on the production line transfer equipment and controlled and connected to a weighing control system 3. The electronic weighing devices 2 are independently installed and synchronously raised and lowered. Each electronic weighing device 2 includes an electronic scale 4 and an electronic scale lifting mechanism 5 installed on the electronic scale. The electronic scale 4 includes a weighing platform 41 and a weight sensor 42 installed inside the weighing platform. Each electronic weighing device 2 forms a parallel beam sensor integral structure, and the several electronic weighing devices 2 form a multi-point support lifting weighing system.

[0030] like Figure 3 , Figure 4As shown, the electronic scale lifting mechanism 5 includes a scissor lift mechanism 6 and a power unit 7 for driving the scissor lift mechanism 6 to lift. The scissor lift mechanism 6 includes a scissor lift assembly 8 and a support platform 9 disposed on the upper end of the scissor lift assembly 8. A wear-resistant lifting bracket 10 is disposed on the support platform 9. The scissor lift assembly 8 includes a scissor lift slide 81, a linear roller assembly 82, and a scissor lift rod 83. A sliding groove 84 is provided on the scissor lift slide, and the linear roller assembly 82 is slidably connected to the sliding groove 84.

[0031] The linear roller assembly 82 includes a roller drive shaft 823 and rollers 824 disposed at both ends of the roller drive shaft 823.

[0032] The power unit 7 is pneumatically driven, hydraulically driven, or electrically driven. In this embodiment, the power unit is pneumatically driven, specifically using a cylinder.

[0033] In operation, slender steel pipes of different specifications, such as 40-meter-long pipes with a diameter of 12mm and 20-meter-long pipes with a diameter of 8mm, are transported together along the production line to the weighing area of ​​the transfer equipment. Simultaneously, several electronic scales 4 are activated, and these scales weigh the various specifications of slender steel pipes on the online transfer equipment. Different slender steel pipes are supported by different numbers of electronic scales, independently transmitting their weights to the weight control system. The weight control system automatically accumulates and displays the weight data from each electronic scale. Because multiple electronic scales are used, within the set maximum weighing range, regardless of the length and specifications of the slender steel pipes, multiple points of support can be used to achieve net weight weighing within the set maximum weighing range. This net weight weighing method ensures high weighing accuracy. The use of pneumatic lifting electronic scales for synchronous lifting creates a parallel beam sensor integrated structure, which improves the measurement accuracy of a single electronic scale and reduces the measurement error of the integrated weighing system with multiple electronic scales. Employing a pneumatic scissor lift structure, the weighing platform's support surface rises and falls parallel to the ground, ensuring unobstructed trajectory movement. The structure is simple, reliable, and highly stable. It ensures that slender steel pipes of varying specifications are completely detached from the conveyor line for weighing, preventing the pipes from sagging and contacting the transfer equipment during lifting, thus avoiding impact on weighing. The electronic scale's lifting mechanism and height are matched to the dimensions of the on-site transfer equipment.

[0034] The weighing control system is designed according to its functions, and the control methods and related control techniques all adopt existing technologies. In this embodiment, the weighing control system is equipped with an instrument cabinet, a weight meter, and a display screen, all of which can be configured according to the online production control system. This allows for independent channel calibration and adjustment of a single electronic scale, facilitating the recording and querying of weighing data. Multiple electronic scales can integrate the weights of each channel, and the weight meter accumulates the data and displays the total weight, weighing count, and other data online, thus realizing online weighing and online management.

[0035] Example 2: See Figures 1 to 4 In this embodiment, the example is a transfer device installed in a slender steel pipe production workshop. The transfer device 100 includes a transfer car body 101 and an upper-mounted powered roller conveyor 102 installed on the transfer car body 101.

[0036] The aforementioned top-mounted powered roller conveyor 102 includes a roller conveyor frame 105, a plurality of horizontally arranged rollers 103 on the track frame 105, and a drive device for rotating the rollers. The drive device can, for example, be a chain drive system driven by a drive motor. Other drive devices can also be used.

[0037] A roller conveying interval 104 is provided between the rollers 103.

[0038] A multi-specification slender steel pipe online weighing device 1 is installed inside the roller conveyor interval 104, and during lifting, it will rise along the roller conveyor interval to the top of the upper-mounted power roller conveyor 102.

[0039] The online weighing device 1 for multi-specification slender steel pipes includes an electronic weighing device 2 and a weighing control system 3.

[0040] The electronic weighing device 2 adopts an integrated structure of parallel beam sensors, which is beneficial to improving the measurement accuracy of a single electronic scale and reducing the measurement error of the integrated weighing system of 15 scales.

[0041] The electronic weighing devices 2 are set in several groups. Each group of electronic weighing devices 2 is set independently and lifted synchronously for weighing. Each group of electronic scale devices 2 forms an independent weighing channel. Through independent calibration and adjustment, high weighing accuracy is ensured.

[0042] The electronic weighing device 2 includes an electronic scale 4 and an electronic scale lifting mechanism 5 mounted on the electronic scale 4. The electronic scale 4 includes a weighing platform 41 and a weight sensor 42 mounted inside the weighing platform. Each electronic weighing device 2 forms a parallel beam sensor integral structure, and several electronic weighing devices 2 form a multi-point support lifting weighing system. The weighing platform 41 is fixedly connected to the transfer vehicle body 101 at the roller conveyor interval 104.

[0043] The electronic scale lifting mechanism 5 is installed on the weighing platform 41 of the electronic scale.

[0044] The electronic scale lifting mechanism 5 adopts a pneumatic scissor lift structure, with the weighing platform's support surface rising and falling in parallel. The track movement is unobstructed, the structure is simple and reliable, and it possesses high stability. The electronic scale lifting mechanism 5 and its height match the dimensions of the on-site transfer vehicle's top-mounted powered roller conveyor 102.

[0045] The electronic scale lifting mechanism 5 includes a scissor mechanism 6 and a power unit 7 mounted on the weighing platform 41.

[0046] The power unit 7 can be driven by various methods such as pneumatic drive, hydraulic drive or electric motor drive. The power unit 7 drives the lifting and lowering movement of the scissor mechanism 6, thereby realizing the lifting and lowering of the electronic scale and weighing of the slender steel pipe.

[0047] In this embodiment, a pneumatic electronic scale lifting mechanism is used, and the specific driving device includes a driving cylinder 71.

[0048] The scissor lift mechanism 6 includes a scissor lift assembly 8 and a support platform 9 set on the upper end of the scissor lift assembly. The support platform 9 is provided with a lifting bracket 10, which is made of nylon material to avoid friction damage to the slender steel pipe during the weighing process.

[0049] The lifting bracket 10 is equipped with lifting bracket guard plates 11 on both sides, and guard plate guide surfaces 12 are provided on the lifting bracket guard plates 11 to facilitate the smooth lifting and weighing of slender steel pipes during transport. The lifting bracket is made of nylon material to increase the wear resistance of the weighing platform, extend its service life, and prevent damage to the support surface of the support platform and wear on the slender steel pipes.

[0050] The piston rod 72 of the drive cylinder 71 is provided with a piston rod hinge joint 73, which is connected to the scissor mechanism 6. The drive cylinder is horizontally mounted on the weighing platform 41 via a cylinder mounting bracket 74.

[0051] The scissor lift assembly 8 includes a scissor lift slide 81, a linear roller assembly 82, and a scissor lift rod 83. A groove 84 is provided on the scissor lift slide, and the linear roller assembly 82 is disposed inside the groove 84 and can move along the groove.

[0052] The linear roller assembly 82 includes a lower linear roller assembly 822 and an upper linear roller assembly 821.

[0053] The linear roller assembly 82 includes a roller drive shaft 823 and rollers 824 disposed at both ends of the roller drive shaft 823.

[0054] The linear roller assembly 82 is connected to the piston rod hinge joint 73, and the extension and retraction of the cylinder piston rod 72 drives the linear roller assembly to slide along the scissor lift slide, thereby driving the scissor lift 83 to rise and fall. The sliding stroke of the scissor lift slide matches the lifting stroke.

[0055] The scissor lift slide 81 includes a lower scissor lift slide 811 and an upper scissor lift slide 812. The scissor lift 83 has at least one stage, and can be configured in one stage or multiple stages vertically depending on the lifting height. Each stage of the scissor lift 83 has at least a first scissor lift 831 and a second scissor lift 832 that are hinged together. The first scissor lift 831 and the second scissor lift 832 are hinged together via a scissor shaft 85. In this embodiment, the lower ends of the two sets of first scissor lift 831 are hinged to both ends of the roller drive shaft 823, and the upper ends of the first scissor lift 831 are hinged to the lower surface of the support platform 9 via a set of upper hinge seats 86. The lower ends of the second scissor lift 832 are hinged to the weighing platform 41 via a set of lower hinge seats 87, and the upper ends of the second scissor lift 832 are hinged to both ends of the linear roller assembly on the upper scissor lift slide. This forms a pneumatic scissor lift structure driven by a cylinder. The design achieves parallel lifting of the load-bearing support surface of the weighing platform, with unobstructed trajectory operation, simple and reliable structure, and good stability.

[0056] The weighing control system 3 includes an instrument control cabinet, a weight gauge installed inside the cabinet, and a large-screen display. The control circuits and other components in the control system utilize existing control methods. The large-screen display can be, for example, a large-screen LED display. The instrument cabinet is installed at the control position of the on-site transfer vehicle and roller conveyor. Alternatively, the large-screen display can be installed on the outer wall of the control room, providing real-time online weight display for convenient observation.

[0057] Several electronic weighing devices are set up with independent channels. When weighing, all channels can be used, or only some channels can be used for calibration and adjustment, facilitating weighing data recording and retrieval. In this embodiment, 15 electronic weighing devices are set up. When all 15 electronic weighing devices are in use, 15 weighing records are generated. The weight data from all participating electronic weighing devices are integrated and automatically accumulated to display the total weight. This total weight is then transmitted to a weighing instrument and displayed online on a large screen. The weighing instrument cumulatively displays the total weight and the online weight display. Simultaneously, it can also upload data to the factory management system in a timely manner according to the communication interface and format required by the customer.

[0058] See Figure 5 During use, the slender steel pipes produced online are conveyed along the production line (the conveying direction of the slender steel pipes is along...). Figure 5The arrow method involves several rotating rollers conveying a slender steel pipe along its length (the pipe is transported forward during the roller rotation) to its fixed position on a power roller conveyor mounted on a transfer vehicle. See also... Figure 6 , Figure 7 Fifteen electronic weighing devices are activated to simultaneously lift the slender steel pipes on the roller conveyor, enabling online weighing. The lifting stroke L of the electronic weighing device is the height H of the pipes rising above the track machine, i.e., the height of the roller conveyor line, thus allowing the steel pipes to be completely removed from the roller conveyor for weighing.

[0059] Fifteen electronic weighing devices are installed and fixed within the gaps in the roller conveyor of the 40m long overhead power roller conveyor. This ensures that steel pipes with a diameter of ∅12mm or less and a length of more than 40 meters are completely removed from the roller conveyor for weighing. At the same time, it effectively avoids problems such as the lifting support deflecting and coming into contact with the roller conveyor, which would affect the weighing accuracy.

[0060] The synchronous lifting of several parallel beam sensor integrated electronic weighing devices improves the measurement accuracy of a single electronic scale, thereby reducing the measurement error of the integrated weighing system of 15 scales. Employing a scissor-lifting structure, the weighing platform's load-bearing support surface rises and falls parallel to each other, ensuring unobstructed trajectory movement. The structure is simple, reliable, and highly stable. The electronic weighing devices are fitted with nylon lifting brackets, which offer excellent wear resistance and a long service life, preventing damage to the steel pipe support surface.

[0061] The lifting mechanism and height of the electronic weighing device are matched with the dimensions of the on-site rotating trolley-mounted powered roller conveyor. This lifting-type weighing system enables net weight measurement and ensures high weighing accuracy.

Claims

1. An online weighing device for multi-specification slender steel pipes, characterized in that: It includes several electronic weighing devices (2) installed on the production line transfer equipment and connected to the weighing control system. The several electronic weighing devices (2) are independently set up and raised and lowered synchronously. The electronic weighing devices (2) include an electronic scale (4) and an electronic scale lifting mechanism (5) installed on the electronic scale (4).

2. The online weighing device for multi-specification slender steel pipes according to claim 1, characterized in that: The electronic scale (4) includes a weighing platform (41) and a weight sensor (42) installed inside the weighing platform; each electronic weighing device (2) forms a parallel beam sensor integral structure, and several electronic weighing devices (2) form a multi-point support lifting weighing system.

3. The online weighing device for multi-specification slender steel pipes according to claim 1, characterized in that: The electronic scale lifting mechanism (5) includes a scissor mechanism (6) and a power device (7) for driving the scissor mechanism (6) to lift.

4. The online weighing device for multi-specification slender steel pipes according to claim 3, characterized in that: The scissor lift mechanism (6) includes a scissor lift assembly (8) and a support platform (9) provided on the upper end of the scissor lift assembly (8). A wear-resistant lifting bracket (10) is provided on the support platform (9).

5. The online weighing device for multi-specification slender steel pipes according to claim 4, characterized in that: The scissor lift assembly (8) includes a scissor lift slide (81), a linear roller assembly (82), and a scissor lift rod (83). A groove (84) is provided on the scissor lift slide (81), and the linear roller assembly (82) is slidably connected to the groove (84).

6. The online weighing device for multi-specification slender steel pipes according to claim 5, characterized in that: The linear roller assembly (82) is provided with a lower linear roller assembly (822) and an upper linear roller assembly (821); the scissor slide (81) is provided with a lower scissor slide (811) and an upper scissor slide (812); the scissor bar (83) is provided with at least one stage and each stage of the scissor bar (83) includes a first scissor bar (831) and a second scissor bar (832) that are hinged together.

7. The online weighing device for multi-specification slender steel pipes according to claim 5, characterized in that: The linear roller assembly (82) includes a roller drive shaft (823) and rollers (824) disposed at both ends of the roller drive shaft (823).

8. The online weighing device for multi-specification slender steel pipes according to claim 3, characterized in that: The power unit (7) is pneumatically driven, hydraulically driven, or electrically driven.

9. The online weighing device for multi-specification slender steel pipes according to any one of claims 1 to 8, characterized in that: The transfer equipment (100) includes a transfer vehicle body (101) and an upper-mounted powered roller conveyor (102) mounted on the transfer vehicle body (101).

10. The online weighing device for multi-specification slender steel pipes according to claim 9, characterized in that: The above-mounted power roller conveyor (102) includes a roller conveyor frame (105), several horizontally arranged rollers (103) on the roller conveyor frame (105) and a drive device for driving the rollers to rotate; a roller conveying interval (104) is provided between the rollers (103); the electronic weighing device (2) is installed on the transfer car body (101) where the gap of the conveying interval (104) is located.

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