An assembly and positioning device for flat steel and tubes in a membrane tube screen

Abstract

This utility model relates to the field of boiler manufacturing technology, specifically to an assembly and positioning device for flat steel and tubes in a membrane tube panel. The device includes a base frame, an upper clamping assembly, a lower positioning assembly, and a pneumatic drive system. The upper clamping assembly is mounted on the upper part of the base frame and includes adjustable clamping blocks for holding the tubes and flat steel, used to clamp the workpieces. The lower positioning assembly is located below and includes movable support rollers to support the workpieces and facilitate conveying. Its bearing seats can adjust the clamping center distance via pads. The pneumatic drive system drives the upper clamping assembly to rise and fall, achieving clamping or releasing. This device solves the problems of low accuracy in traditional manual positioning and poor adaptability of fixed fixtures. It can adapt to membrane tube panels of different specifications, providing accurate positioning and improving yield. The pneumatic drive improves clamping efficiency, facilitates production changeover adjustments, reduces labor intensity and equipment costs, and helps improve the quality and efficiency of boiler manufacturing.

Description

Technical Field

[0001] This utility model relates to the field of boiler manufacturing technology, specifically to an assembly and positioning device for flat steel and tubes in a membrane tube screen. Background Technology

[0002] As a core heating surface component of a boiler furnace, the membrane tube panel is constructed by tightly assembling multiple parallel tubes and flat steel bars through processes such as spot welding and full welding. The assembly precision directly determines the boiler's operational safety, heat exchange efficiency, and sealing performance. Excessive misalignment between the flat steel bars and tubes can easily lead to problems such as cracks, air leaks, or localized overheating at the welds. This not only requires additional manpower and resources for rework and repair but may also shorten the overall service life of the boiler and even cause safety accidents. Therefore, in the entire boiler manufacturing process, the assembly and positioning of the membrane tube panel's flat steel bars and tubes is a crucial step in ensuring product quality and controlling production costs; its technical level directly impacts the company's production competitiveness.

[0003] Currently, the assembly and positioning methods for membrane-type tube screen flat steel and tubes widely used in the industry mainly have the following problems, all of which are accompanied by significant defects: 1. In some production workshops with low levels of automation, there is still a heavy reliance on the experience of operators for visual positioning and manual adjustments. This method is not only extremely inefficient and labor-intensive, but the positioning accuracy also depends entirely on the worker's skill level and condition, leading to huge fluctuations in product quality and a lack of consistency. During long working hours, workers are prone to fatigue, further exacerbating the risk of loss of accuracy control.

[0004] 2. To address the shortcomings of manual positioning, some manufacturers use specially designed fixed clamps. These clamps are typically customized for membrane tube panels with specific pipe diameters and pitches. While they improve the assembly accuracy of individual products to some extent, they lack flexibility and adjustability. Once the boiler model changes, or the pipe diameter, flat steel size, or membrane tube panel pitch changes, the original clamps become completely ineffective, requiring the redesign and manufacture of the entire tooling set. This not only results in significant equipment idleness and waste but also prolongs the production preparation cycle, failing to meet the demands of modern flexible production with diverse varieties and small batches.

[0005] Therefore, developing a new type of assembly and positioning device that can simplify the process, improve structural adaptability, lower the operating threshold, and take into account the positioning function has become a key direction for solving the above-mentioned industry problems and promoting the upgrading of boiler manufacturing technology. Utility Model Content

[0006] To address the shortcomings of existing technologies, the purpose of this utility model is to provide an assembly and positioning device for flat steel and tubes in membrane tube panels, which can simultaneously meet the three core requirements of high-precision positioning, high-efficiency clamping, and wide-range flexible adjustment. This simplifies the operation steps, reduces reliance on operator skills, shortens changeover and adjustment time, and ultimately achieves a synergistic improvement in the quality and production efficiency of membrane tube panels.

[0007] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution: In a first aspect, this utility model provides an assembly and positioning device for flat steel and tubes in a membrane tube screen, comprising: Device base frame; The upper clamping assembly is mounted on the upper part of the device base frame and is used to clamp the pipe and flat steel to be assembled and positioned from above; The lower positioning assembly is mounted on the device base frame below the upper clamping assembly. It is used to support and position the pipe and flat steel from below and can cooperate with the conveying of the pipe and flat steel. And a pneumatic drive system connected to the upper clamping assembly for driving the upper clamping assembly to move closer to or away from the lower positioning assembly to perform the action of clamping or releasing the tube and flat steel.

[0008] As a preferred embodiment of this utility model, the lower positioning assembly includes a bearing seat mounted on the device base frame, a drive shaft rotatably connected to the bearing seat, and at least one pipe support roller and at least one flat steel support roller mounted on the drive shaft; the top of the pipe support roller is used to support the pipe, and the top of the flat steel support roller is used to support the flat steel.

[0009] As a preferred embodiment of this utility model, the pipe support roller is a flat hourglass-shaped structure, the flat steel support roller is a flat cylindrical structure, and the top elevation of the pipe support roller is lower than the top elevation of the flat steel support roller.

[0010] As a preferred embodiment of this utility model, the pipe support roller and the flat steel support roller are adjustablely connected to the drive shaft, so that the pipe support roller and the flat steel support roller can move along the axial direction of the drive shaft and be fixed in different positions.

[0011] As a preferred technical solution of this utility model, the bearing seat is a detachable structure, and the bearing seat and the device base frame can be selectively equipped with or have fewer pads added to adjust the clamping and positioning center distance of the device for the flat steel and the pipe.

[0012] As a preferred embodiment of this utility model, the upper clamping assembly includes a pressure plate that moves vertically driven by the pneumatic drive system, and at least one pipe clamping block and at least one flat steel clamping block mounted on the pressure plate; the pipe clamping block and the pipe support roller of the lower positioning assembly clamp and position the pipe, and the flat steel clamping block and the flat steel support roller of the lower positioning assembly clamp and position the flat steel.

[0013] As a preferred embodiment of this utility model, the pipe clamping block includes a first limiting rod, a first connecting rod, and a first clamping rod connected sequentially from top to bottom. The flat steel clamping block includes a second limiting rod, a second connecting rod, and a second clamping rod connected sequentially from top to bottom. The first limiting rod and the second limiting rod are both connected to the pressure plate. The first clamping rod has an inverted V-shaped structure and fits against the arc surface of the pipe. The second clamping rod is set perpendicular to the second limiting rod and fits against the top surface of the flat steel.

[0014] As a preferred embodiment of this utility model, the pipe clamping block and the flat steel clamping block are adjustablely connected to the pressure plate, so that the position of the pipe clamping block and the flat steel clamping block on the radial horizontal plane of the pipe can be adjusted.

[0015] As a preferred technical solution of this utility model, the top of the pressure plate is provided with a groove and a cover plate adapted to and connected to the groove. The groove is provided with an elongated hole perpendicular to the pipe axis. The first connecting rod and the second connecting rod pass through the elongated hole and can move along its length direction. The elongated hole is provided with a plurality of slots at intervals along its length direction. The first limiting rod and the second limiting rod are embedded in the slots.

[0016] As a preferred embodiment of the present invention, the pneumatic drive system includes at least one cylinder, the cylinder body of which is fixed on the device base frame or directly fixed on the workshop floor, and its piston rod is connected to the pressure plate of the upper clamping assembly.

[0017] Compared with the prior art, the beneficial effects of the assembly and positioning device for flat steel and tube in the membrane tube screen of this utility model are as follows: 1. This utility model device, through its precise clamping and positioning structure design, fundamentally solves the problems of poor accuracy in traditional manual positioning and low adaptability of fixed clamps. Specifically, in the upper clamping assembly, the pipe clamping block adopts an inverted V-shaped structure, which can closely fit the arc surface of the pipe; the flat steel clamping block adopts a vertical fitting structure, which is perfectly adapted to the top surface of the flat steel. The two, together with the pipe support roller (hourglass shape) and flat steel support roller of the lower positioning assembly, form a "corresponding clamping" to ensure that the relative position of the pipe and the flat steel is accurately fixed. This avoids problems such as welding cracks, air leakage, and local overheating caused by positioning deviations, reduces rework and repair costs, extends the overall service life of the boiler, ensures the safety and heat exchange efficiency of boiler operation, and ultimately significantly improves the yield rate of membrane tube screen products.

[0018] 2. This utility model device significantly reduces operation steps and production cycle through its integrated design of automated drive, positioning, and conveying. Specifically, it uses a cylinder as the core of the pneumatic drive system, eliminating the need for complex motor control. Simply operating the cylinder quickly achieves the "approaching clamping" and "moving away release" of the upper clamping assembly. The clamping action is highly efficient and simple to operate, significantly improving efficiency compared to manual adjustment. The lower positioning assembly's tube support rollers, flat steel support rollers, and drive shaft are rotatable structures. While completing the support and positioning, they can directly cooperate with the production line to achieve continuous conveying of the tubes and flat steel, eliminating the need for additional conveying mechanisms or interrupting the positioning process. This thoroughly simplifies the process flow of membrane tube screen production and avoids efficiency losses caused by process disconnections.

[0019] 3. This utility model device, through its fully adjustable structure, breaks through the limitations of traditional fixed fixtures that require one tooling per product, and can adapt to the production needs of membrane tube screens of different specifications. Specifically, the tube / flat steel support rollers and the drive shaft are adjustable, allowing them to move and be fixed along the drive shaft axis; the tube / flat steel clamping blocks of the upper clamping assembly can be adjusted in position on the horizontal plane through the elongated holes and slots of the pressure plate to meet the needs of different membrane tube screen pitches. The bearing seats of the lower positioning assembly are detachable, and the elevation of the support rollers can be adjusted by adding / removing pads, thereby adapting to changes in the clamping and positioning center distance caused by different pipe diameters and flat steel sizes; there is no need to redesign and manufacture the entire set of tooling due to changes in boiler models, reducing equipment idle waste, shortening changeover adjustment time, perfectly adapting to the modern flexible production needs of multiple varieties and small batches, and significantly improving equipment utilization.

[0020] 4. This utility model device replaces manual intervention with structural automation, reducing reliance on operator skills. Specifically, traditional manual positioning relies on workers' experience for visual adjustments, which is labor-intensive and prone to accuracy loss due to fatigue. In this device, however, workers only need to roughly adjust the initial positions of the pipe and flat steel; subsequent positioning actions are automatically completed by cylinder drive, eliminating the need for continuous manual intervention. This reduces the skill requirements of operators, alleviates labor intensity, and avoids positioning deviations caused by subjective human factors from the source, ensuring consistent product quality.

[0021] 5. The device of this utility model is designed to balance low cost and ease of operation. The overall structure is simple, without complex precision parts, lightweight, and low manufacturing cost. Compared with the high investment in customized fixed fixtures, it significantly reduces the equipment procurement cost for enterprises. The assembly and use process is simple: workers can complete the installation and daily operation of the device without professional training. Subsequent maintenance only requires basic inspection of vulnerable parts such as rollers and cylinders, further reducing the enterprise's labor and maintenance costs. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural diagram of the assembly and positioning device for flat steel and tubes in the membrane tube screen of this utility model.

[0023] Figure 2 This is a front structural schematic diagram of the assembly and positioning device for flat steel and tubes in the membrane tube screen of this utility model.

[0024] Figure 3 This is an exploded structural diagram of the assembly and positioning device for flat steel and tubes in the membrane tube screen of this utility model.

[0025] Reference numerals: 1. Device base frame; 101. Base plate; 102. First side plate; 2. Upper clamping assembly; 201. Pressure plate; 202. Pipe clamping block; 203. Flat steel clamping block; 204. First limiting rod; 205. First connecting rod; 206. First clamping rod; 207. Second limiting rod; 208. Second connecting rod; 209. Second clamping rod; 210. Groove; 211. Cover plate; 212. Elongated hole; 213. Slot; 214. Second side plate; 3. Lower positioning assembly; 301. Bearing seat; 302. Drive shaft; 303. Pipe support roller; 304. Flat steel support roller; 4. Pneumatic drive system; 401. Cylinder; 402. Piston rod; 5. Pipe; 6. Flat steel. Detailed Implementation

[0026] To enable those skilled in the art to better understand the technical solution of this utility model, the preferred embodiments of this utility model are described below in conjunction with specific examples. However, it should be understood that the accompanying drawings are for illustrative purposes only and should not be construed as limiting this patent. For better illustration of this embodiment, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable that some well-known structures and their descriptions may be omitted in the drawings for those skilled in the art. The positional relationships described in the drawings are for illustrative purposes only and should not be construed as limiting this patent.

[0027] The assembly and positioning device for flat steel and tubes in a membrane tube screen according to this embodiment is mainly used in the boiler manufacturing field, especially suitable for multi-variety, small-batch membrane tube screen production scenarios. It can accommodate the assembly and positioning of flat steel and tubes in membrane tube screens with different tube diameters, different flat steel sizes, and different pitches, and fundamentally solves the industry pain points of low accuracy in traditional manual positioning and poor adaptability of fixed clamps. The following is in conjunction with the attached... Figures 1-3 The document provides a detailed explanation of the device's structure, installation and commissioning, usage procedures, working principle, and core advantages.

[0028] In some embodiments, the device base frame 1 serves as the core supporting structure to ensure overall stability. The device base frame 1 consists of a horizontally arranged base plate 101 and first side plates 102 vertically fixed to both sides of the base plate 101.

[0029] Specifically, the base plate 101 is made of steel plate, with pre-drilled mounting holes at the four corners of the bottom surface. It can be fixed to the workshop floor with expansion bolts to prevent displacement due to vibration during operation and ensure the stability of the positioning reference. The first side plate 102 is also made of steel plate, with guide rail grooves machined vertically on the inner side for sliding engagement with the second side plate 214 of the upper clamping assembly. This restricts the pressure plate 201 to move only in the vertical direction, preventing positioning errors caused by horizontal offset.

[0030] Optionally, bolt holes are pre-drilled on the first side plate 102, with the hole spacing matching the cylinder body mounting holes of the cylinder 401, so that the cylinder can be quickly fixed without additional drilling, reducing assembly time and improving device assembly efficiency; or, the first side plate 102 is fixedly connected to the cylinder body of the cylinder 401 through a fixed bracket; or, the cylinder body of the cylinder 401 is directly fixed on the workshop floor.

[0031] In some embodiments, the lower positioning assembly 3 serves as a support, positioning, and auxiliary conveying structure, balancing accuracy and efficiency.

[0032] Specifically, the lower positioning assembly 3 is installed in the middle of the base plate 101, between the first side plates 102 on both sides, and includes a bearing seat 301, a drive shaft 302, a pipe support roller 303 and a flat steel support roller 304, to realize the lower support and initial positioning of the workpiece, and at the same time cooperate with the production line to complete the conveying.

[0033] Optionally, the bearing housing 301 is a detachable cast steel component, connected to the base plate 101 by bolts. A 1mm-5mm thick shim (not shown) can be placed between the bearing housing 301 and the base plate 101. The number of shims can be adjusted according to the pipe diameter to ensure that the clamping and positioning center distance between the pipe center and the top surface of the flat steel meets the welding requirements, eliminating the need to replace the bearing housing body and reducing adaptation costs. The two ends of the drive shaft 302 are rotatably connected to the bearing housing 301 via deep groove ball bearings. The bearings can be filled with grease to ensure low rotational resistance of the drive shaft and reduce frictional loss during workpiece transport.

[0034] Optionally, the pipe support roller 303 is a flat hourglass-shaped structure, made of wear-resistant nylon injection molding. Its outer circular surface fits the pipe's arc surface very well. The hourglass-shaped "narrow in the middle and wide at both ends" structure can radially limit the pipe and prevent it from shifting left or right during transportation. At the same time, the nylon material has moderate hardness to avoid scratching the outer wall of the pipe.

[0035] Optionally, the flat steel support roller 304 is a flat cylindrical structure, also made of wear-resistant nylon material, and its top elevation is higher than that of the pipe support roller 303, which meets the requirements of the membrane tube screen welding process.

[0036] Optionally, the adjustable tube support roller 303 and the flat steel support roller 304 are connected to the drive shaft 302 via a flat key, and the drive shaft 302 is machined with a keyway along the axial direction, allowing the rollers to move axially and be fixed with screws. For example, when the pitch of the diaphragm tube screen is adjusted from 60mm to 80mm, the rollers are moved to increase the center distance between adjacent tube support rollers from 60mm to 80mm, and the position of the flat steel support roller is adjusted simultaneously to ensure a one-to-one correspondence between the flat steel and the roller, adapting to different pitch requirements.

[0037] In some embodiments, the upper clamping assembly 2 is used for precise clamping, working in conjunction with the lower positioning assembly to ensure accuracy.

[0038] Specifically, the upper clamping assembly 2 is installed on the upper part of the first side plate 102 and is located directly above the lower positioning assembly 3. It includes a pressure plate 201, a pipe clamping block 202, a flat steel clamping block 203 and a second side plate 214. The workpiece is accurately positioned by corresponding clamping of the upper and lower parts.

[0039] Optionally, the pressure plate 201 is made of steel plate, with a length matching that of the drive shaft 302. A groove 210 is provided on the top, and an elongated hole 212 (its width must be adapted to the diameter of the connecting rod) is machined within the groove along its length perpendicular to the pipe axis. Multiple slots 213 (their width must be adapted to the width of the limiting rod) are machined along the length of the elongated hole. This slot design allows for quick fixation of the clamping block's position, preventing displacement due to vibration during clamping.

[0040] Optionally, the second side plate 214 is vertically welded to both ends of the pressure plate 201, and its outer side is embedded in the guide rail groove of the first side plate 102 with a fit gap of ≤0.1mm, ensuring that the pressure plate moves only in the vertical direction, with small vertical positioning deviation during clamping, and greatly improving positioning accuracy.

[0041] Optionally, the pipe clamping block 202 is connected from top to bottom to the first limiting rod 204, the first connecting rod 205, and the first clamping rod 206: the first limiting rod 204 can be embedded in the slot 213, the first connecting rod 205 passes through the elongated hole 212 and can move along the length of the hole; the first clamping rod 206 has an inverted V-shaped structure, and the V-shaped angle is designed according to the pipe diameter (100-120°) so that it can better fit and clamp the outer wall of the pipe.

[0042] Optionally, the flat steel clamping block 203 includes a second limiting rod 207, a second connecting rod 208, and a second clamping rod 209. The second limiting rod 207 can be embedded in the slot 213, the second connecting rod 208 passes through the elongated hole 212 and can move along the length of the hole; the second clamping rod 209 is a straight rod and is perpendicular to the second limiting rod 207, and can be directly attached to the top surface of the flat steel.

[0043] In some embodiments, the pneumatic drive system 4 achieves efficient drive and reduces the operational threshold.

[0044] Specifically, the pneumatic drive system 4 includes two cylinders 401 symmetrically arranged on both sides of the device frame to realize the lifting drive of the upper clamping assembly, replacing the traditional manual clamping. The cylinder body of the cylinder 401 is fixed to the top of the first side plate 102 by bolts or fixed to the workshop floor by diameter, and the piston rod 402 is connected to the pressure plate 201.

[0045] In the continuous production phase of this embodiment, the specific operating steps are as follows: 1. Material loading and initial alignment The conveyor mechanism of the membrane tube screen production line is activated, placing the tubes 5 and flat steel 6 on the conveyor belt with the tubes arranged parallel to each other and the flat steel positioned between adjacent tubes. The conveyor mechanism then delivers the first end of the workpiece above the lower positioning assembly 3. Workers only need to visually adjust the position to ensure the tubes fall into the hourglass-shaped grooves of the tube support rollers 303 and the flat steel falls on top of the flat steel support rollers 304, eliminating the need for precise alignment and significantly reducing reliance on worker skills.

[0046] 2. Pneumatic clamping and positioning When cylinder 401 is activated, the piston rod extends and drives pressure plate 201 to descend vertically along the guide rail; the inverted V-shaped structure of pipe clamping block 202 cooperates with pipe support roller 303 to clamp the pipe from the top and bottom sides, achieving radial positioning; flat steel clamping block 203 cooperates with flat steel support roller 304 to clamp the flat steel and restrict lateral displacement; the positioning accuracy of this workpiece is much higher than that of traditional manual positioning, effectively avoiding subsequent welding cracks, air leakage and other problems.

[0047] 3. Spot welding operation Welders use spot welding machines to spot weld the connection between pipes and flat steel. Because of the precise positioning, welders do not need to adjust the position of the workpiece and can spot weld continuously, increasing efficiency by 30%.

[0048] 4. Release and auxiliary conveying After the first section is spot-welded, the piston rod retracts, the pressure plate rises to release the workpiece, and the conveying mechanism is activated. The workpiece drives the rollers of the lower positioning assembly to rotate synchronously. The low rolling friction of the rollers reduces the load on the conveying mechanism and extends its lifespan. The workpiece is conveyed forward, and after the subsequent un-spot-welded sections enter the device, steps 2-3 are repeated to achieve continuous production.

[0049] 5. Production restructuring When producing membrane tube screens of different specifications, there is no need to change the entire tooling set: Add or remove shims under the bearing housing to adjust the positioning center distance; Move the rollers on the drive shaft and the clamping block to the corresponding slots to adjust the pitch.

[0050] Compared to traditional fixed fixtures for changeover, this device significantly reduces changeover costs and time, meeting the needs of multi-variety, small-batch production.

[0051] In summary, the assembly and positioning device for flat steel and tubes in the membrane tube screen of this embodiment solves the core pain points of traditional positioning methods through structural optimization and functional integration. While ensuring high precision, it also takes into account efficiency, flexibility and cost, providing boiler manufacturing enterprises with an efficient and reliable assembly and positioning solution, which has significant practical value and promotion prospects.

[0052] Based on the description and drawings of this utility model, those skilled in the art can easily manufacture or use the assembly and positioning device for flat steel and tubes in a membrane tube screen according to this utility model, and can produce the positive effects described in this utility model.

[0053] Unless otherwise specified, in this utility model, terms such as "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe orientation or positional relationships in this utility model are for illustrative purposes only and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood in conjunction with the accompanying drawings and according to the specific circumstances.

[0054] Unless otherwise expressly specified and limited, the terms "set up," "connected," and "linked" in this utility model should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0055] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present utility model shall fall within the protection scope of the present utility model.

Claims

1. An assembly and positioning device for flat steel and tubes in a membrane tube screen, characterized in that, include: Device base frame (1); Upper clamping assembly (2), which is mounted on the upper part of the device base frame (1) and is used to press the tube (5) and flat steel (6) to be assembled and positioned from above. The lower positioning assembly (3) is mounted on the device base frame (1) below the upper clamping assembly (2) for supporting and positioning the pipe (5) and flat steel (6) from below, and can cooperate with the conveying of the pipe (5) and flat steel (6); And a pneumatic drive system (4), which is connected to the upper clamping assembly (2) and is used to drive the upper clamping assembly (2) to move closer to or away from the lower positioning assembly (3) to perform the action of clamping or releasing the tube (5) and the flat steel (6).

2. The assembly and positioning device for flat steel and tube in a membrane tube screen according to claim 1, characterized in that, The lower positioning assembly (3) includes a bearing seat (301) mounted on the device base frame (1), a drive shaft (302) rotatably connected to the bearing seat (301), and at least one pipe support roller (303) and at least one flat steel support roller (304) mounted on the drive shaft (302); the top of the pipe support roller (303) is used to support the tube (5), and the top of the flat steel support roller (304) is used to support the flat steel (6).

3. The assembly and positioning device for flat steel and tube in a membrane tube screen according to claim 2, characterized in that, The pipe support roller (303) is a flat hourglass-shaped structure, and the flat steel support roller (304) is a flat cylindrical structure. The top elevation of the pipe support roller (303) is lower than the top elevation of the flat steel support roller (304).

4. The assembly and positioning device for flat steel and tube in a membrane tube screen according to claim 2, characterized in that, The pipe support roller (303) and the flat steel support roller (304) are adjustablely connected to the drive shaft (302) so that the pipe support roller (303) and the flat steel support roller (304) can move along the axial direction of the drive shaft (302) and be fixed in different positions.

5. The assembly and positioning device for flat steel and tube in a membrane tube screen according to claim 2, characterized in that, The bearing seat (301) is a detachable structure, and the bearing seat (301) and the device base frame (1) can be selectively equipped with or have fewer pads added to adjust the clamping and positioning center distance of the device for the flat steel (6) and the pipe (5).

6. The assembly and positioning device for flat steel and tube in a membrane tube screen according to claim 1, characterized in that, The upper clamping assembly (2) includes a pressure plate (201) that moves vertically driven by the pneumatic drive system (4), and at least one pipe clamping block (202) and at least one flat steel clamping block (203) mounted on the pressure plate (201); the pipe clamping block (202) clamps and cooperates with the pipe support roller (303) of the lower positioning assembly (3) to position the pipe (5), and the flat steel clamping block (203) clamps and cooperates with the flat steel support roller (304) of the lower positioning assembly (3) to position the flat steel (6).

7. The assembly and positioning device for flat steel and tube in a membrane tube screen according to claim 6, characterized in that, The pipe clamping block (202) includes a first limiting rod (204), a first connecting rod (205) and a first clamping rod (206) connected from top to bottom. The flat steel clamping block (203) includes a second limiting rod (207), a second connecting rod (208) and a second clamping rod (209) connected from top to bottom. The first limiting rod (204) and the second limiting rod (207) are both connected to the pressure plate (201). The first clamping rod (206) has an inverted V-shaped structure and fits against the arc surface of the pipe (5). The second clamping rod (209) is set perpendicular to the second limiting rod (207) and fits against the top surface of the flat steel (6).

8. The assembly and positioning device for flat steel and tube in a membrane tube screen according to claim 7, characterized in that, The pipe clamping block (202) and the flat steel clamping block (203) are adjustablely connected to the pressure plate (201) so that the pipe clamping block (202) and the flat steel clamping block (203) can be adjusted to their position on the radial horizontal plane of the pipe (5).

9. The assembly and positioning device for flat steel and tube in a membrane tube screen according to claim 8, characterized in that, The pressure plate (201) has a groove (210) on its top and a cover plate (211) adapted to and connected to the groove (210). The groove (210) has an elongated hole (212) perpendicular to the axial direction of the tube (5). The first connecting rod (205) and the second connecting rod (208) pass through the elongated hole (212) and can move along its length. The elongated hole (212) has a plurality of slots (213) spaced apart along its length. The first limiting rod (204) and the second limiting rod (207) are embedded in the slots (213).

10. The assembly and positioning device for flat steel and tube in a membrane tube screen according to claim 1, characterized in that, The pneumatic drive system (4) includes at least one cylinder (401), the cylinder body of which is fixed on the device base frame (1) or directly fixed on the workshop floor, and its piston rod (402) is connected to the pressure plate (201) of the upper clamping assembly (2).

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