Boiler guard plate multi-point synchronous bending forming device and bending method

Abstract

The invention provides a boiler guard plate multi-point synchronous bending forming device and a bending method, the boiler guard plate multi-point synchronous bending forming device comprises a downward pressing mechanism and a downward bending mechanism, and the downward bending mechanism comprises a liftable elastic bearing mechanism used for bearing a plate. And the multi-point bending mechanisms are arranged at the two ends of the liftable elastic bearing mechanism. The downward pressing mechanism comprises an inner forming block used for conducting inner forming on the plate. And the downward pressing mechanism extrudes the plate placed on the surface of the liftable elastic bearing mechanism, so that the liftable elastic bearing mechanism descends. And along with the descending of the liftable elastic bearing mechanism, the multi-point bending mechanism is used for carrying out multi-point bending on the plate. The multi-point bending mechanism is driven by downward pressing of the downward pressing mechanism to conduct multi-point bending on the plate, multiple bending procedures of the edge of the plate are completed through one-time action, the tedious steps of multiple times of clamping and positioning in traditional machining are effectively reduced, the production efficiency is improved, the forming consistency is guaranteed, and the die cost is reduced.

Description

Technical Field

[0001] This invention belongs to the field of metal sheet forming technology, specifically relating to a multi-point synchronous bending forming device and bending method for boiler liner plates. Background Technology

[0002] Boiler lining plates, as crucial components of large industrial equipment, are typically long strips of metal. Their edges often require multiple bending processes to create reinforcing edges or assembly interfaces with specific angles and shapes. Currently, the industry commonly uses bending machines to perform multiple bends through repeated positioning and bending. This method is cumbersome and inefficient. Furthermore, multiple clamping and positioning operations can lead to cumulative errors, affecting the accuracy of the finished product, especially for long workpieces where straightness is difficult to guarantee. Poor coordination between bending steps makes it difficult to achieve ideal synchronous results, failing to meet the high-efficiency, low-cost, and adaptable multi-bending production requirements for boiler lining plates.

[0003] Therefore, the above problems urgently need to be solved. Summary of the Invention

[0004] Purpose of the invention: In order to overcome the above shortcomings, the present invention provides a multi-point synchronous bending and forming device and bending method for boiler liner plates. Through a single pressing action, multiple bending mechanisms are automatically and synchronously driven to work sequentially, completing multi-step bending of the plate edge and inner forming in one go, thereby improving production efficiency, ensuring forming consistency and reducing mold costs.

[0005] Technical Solution: To achieve the above objectives, this invention provides a multi-point synchronous bending and forming device for boiler liner plates, including a pressing mechanism and a bending mechanism. The bending mechanism includes a liftable elastic support mechanism for receiving the plate. Multi-point bending mechanisms are located at both ends of the liftable elastic support mechanism. The pressing mechanism includes an inner forming block for internal forming of the plate. The pressing mechanism presses the plate placed on the surface of the liftable elastic support mechanism, causing the liftable elastic support mechanism to descend. As the liftable elastic support mechanism descends, the multi-point bending mechanism performs multi-point bending on the plate. This invention achieves multi-point bending of the plate edge in a single operation by driving the multi-point bending mechanism through the pressing mechanism, effectively reducing the cumbersome steps of multiple clamping and positioning in traditional processing, improving production efficiency, ensuring forming consistency, and reducing mold costs.

[0006] Furthermore, in the aforementioned boiler liner multi-point synchronous bending and forming device, the liftable elastic support mechanism includes an upper support plate, a middle plate, and a bottom plate. A secondary plate is fixedly connected to the top surface of the middle plate along its long side, and the secondary plates are arranged parallel to both sides of the upper support plate for mounting the multi-point bending mechanism. The middle plate is connected to vertically arranged guide columns, and the upper support plate and guide columns are slidably connected for guidance. A support cylinder is connected between the middle plate and the bottom plate, and a support spring is installed inside the support cylinder. The support spring passes through the middle plate and abuts against the bottom surface of the upper support plate, forming support for the upper support plate. While bearing the plate material, the upper support plate, through the elastic buffering effect of the support spring, can prevent damage to the plate material due to stress concentration during the initial compression stage, thus improving the stability of the processing. Simultaneously, the secondary plates arranged parallel to both sides of the upper support plate provide a limit for the plate material, preventing it from shifting during bending and ensuring the accuracy of the bending position. The guide column provides stable guidance for the lifting and lowering movement of the upper support plate, effectively preventing the upper support plate from tilting or jamming during descent, and ensuring that the bending force applied to the edge of the plate by the multi-point bending mechanism is evenly distributed.

[0007] Furthermore, in the aforementioned boiler liner multi-point synchronous bending and forming device, the multi-point bending mechanism includes a support block connected to the end of the auxiliary plate. A sliding rod is slidably connected to the support block in the horizontal direction. The inner end of the sliding rod is connected to a first bending mechanism, and the outer end of the sliding rod is drivenly connected to a second bending mechanism. The second bending mechanism is installed at the bottom of the support block. When the upper support plate is driven down by the pressing mechanism, the first bending mechanism contacts and is squeezed by the upper support plate, thereby driving the sliding rod to slide outward in the horizontal direction, and then driving the second bending mechanism to move through the outer end of the sliding rod. During the bending process, the downward movement of the upper support plate is used as a power source, and the sliding rod sequentially triggers the first bending mechanism and the second bending mechanism to bend the edge of the plate step by step, ensuring the coordination and sequence of the actions between each bending point, and ensuring the accuracy of the bending angle and the forming quality.

[0008] Furthermore, in the aforementioned boiler liner multi-point synchronous bending and forming device, the distance between the bending section of the second bending mechanism and the center of the upper support plate is greater than the distance between the bending section of the first bending mechanism and the center of the upper support plate. During the downward pressing process, the upper support plate squeezes the first bending mechanism and drives the sliding rod, sequentially driving the first and second bending mechanisms to bend the sheet metal. During the bending process, because the bending section of the first bending mechanism is closer to the center of the upper support plate, when the upper support plate begins to descend, it first contacts the first bending mechanism and causes it to move, completing the initial bending of the sheet metal edge; as the upper support plate continues to descend, the sliding rod slides further outward, driving the second bending mechanism to move. At this time, the part of the sheet metal that has completed the initial bending is bent a second time under the action of the second bending mechanism, ensuring that each bending process can be accurately performed based on the previous process, improving the overall bending and forming accuracy and stability.

[0009] Furthermore, in the aforementioned boiler liner multi-point synchronous bending and forming device, the first bending mechanism includes a bending roller connected by a connecting rod and a sliding rod, which are coaxially connected. The diameter of the connecting rod is larger than that of the sliding rod. A bending spring is sleeved on the sliding rod. The bending spring is located within a blind hole in the support block. Both ends of the bending spring abut against the end face of the connecting rod and the bottom of the blind hole, respectively. Both ends of the bending roller are movably connected to a horizontally extending oblong hole in the sub-plate.

[0010] During actual bending operations, when the bending roller is pressed by the upper support plate, it moves away from the center of the upper support plate along the extension direction of the oblong hole. Simultaneously, it drives the connecting rod and sliding rod to slide synchronously. At this time, the connecting rod applies pressure to the bending spring in the blind hole, compressing the bending spring and providing a stable guiding force for the horizontal movement of the bending roller. This ensures that the bending force applied to the edge of the sheet metal by the first bending mechanism is evenly distributed, guaranteeing the initial bending angle accuracy and forming quality of the sheet metal. The length design of the oblong hole determines the maximum horizontal movement distance of the bending roller, thereby controlling the angle range of the first bending of the sheet metal. When the bending operation is completed and the pressing force of the upper support plate on the first bending mechanism disappears, the compressed bending spring releases its elastic potential energy, pushing the connecting rod, sliding rod, and bending roller to move in the opposite direction, returning them to their initial positions.

[0011] Furthermore, in the aforementioned boiler liner multi-point synchronous bending and forming device, the second bending mechanism includes an outer forming block slidably connected to the bottom surface of the support block via a guide rail slider mechanism. A support block is connected to the bottom surface of the support block, extending away from the upper support plate. A rotating shaft is movably connected to one end of the support block away from the upper support plate. The rotating shaft passes horizontally through the support block, and a drive plate is connected to its end, forming an L-shape. One end of the drive plate is drive-connected to the outer forming block, and the other end is drive-connected to a sliding rod. Under the guidance of the guide rail slider mechanism, the outer forming block can stably move horizontally towards or away from the center of the upper support plate. When the sliding rod slides horizontally outward, its outer end pushes one end of the drive plate to rotate around the rotating shaft, while the other end of the drive plate drives the outer forming block to move towards the center of the upper support plate, thus achieving a secondary bending action on the edge of the sheet metal. This transmission method is simple and efficient, stably converting the linear motion of the sliding rod into the horizontal driving motion of the outer forming block, ensuring the accuracy and reliability of the second bending mechanism's action.

[0012] Furthermore, in the aforementioned boiler liner multi-point synchronous bending and forming device, a connecting seat is provided at the connection between the outer forming block and the drive plate. The connecting seat has a mounting groove, and the drive plate is located within the mounting groove. Horizontally extending waist-shaped through holes are provided on both sides of the mounting groove. The drive plate is rotatably and movably connected to the mounting groove via a pin.

[0013] Furthermore, in the aforementioned boiler liner multi-point synchronous bending and forming device, the pressing mechanism includes a top plate, a secondary bending drive plate, and a pressing bending mechanism. The width of the secondary bending drive plate is greater than the width of the pressing bending mechanism. Arc-shaped guide surfaces are provided at both ends of the secondary bending drive plate. The pressing bending mechanism includes a trapezoidal block. Inclined surfaces converge towards the center of the upward support plate on both sides of the trapezoidal block. Inner forming blocks are slidably connected to both sides of the trapezoidal block, and the inner forming blocks are slidably connected to the inclined surfaces. The inclined surfaces have flanges, and the inner forming blocks have grooves that fit the flanges. Limiting grooves are provided on the flanges. Each inner forming block is connected to a limiting plate on the side closest to the trapezoidal block. When the pressing mechanism and the pressing bending mechanism separate, the limiting plate abuts against the bottom surface of the limiting groove to prevent the inner forming blocks from sliding off the trapezoidal block. A retractable elastic column is connected to the bottom surface of the secondary bending drive plate. This column is positioned between the secondary bending drive plate and the inner forming block. During bending, the pressing mechanism presses down, and the retractable elastic column maintains a distance between the secondary bending drive plate and the inner forming block. When the inner forming block and the middle plate abut, the retractable elastic column is compressed, and the trapezoidal block drives the inner forming block to move outward, achieving precise forming of the inner side of the sheet material. Simultaneously, the secondary bending drive plate moves downward and further pushes the sliding rod through the arc-shaped guide surface, ensuring that the second bending mechanism can fully bend the edge of the sheet material.

[0014] Furthermore, in the aforementioned boiler liner multi-point synchronous bending and forming device, the inner forming block has a bending inner forming part on the side away from the trapezoidal block. The bending inner forming part includes a forming groove provided along the side of the inner forming block. The bottom corner of the inner forming block on the side away from the trapezoidal block is set as a bending angle. The inner forming block on the side away from the trapezoidal block has a clearance groove. The forming groove is adapted to the bending shape of the inner side of the plate, the bending angle can accurately fit with the inner edge of the plate at the bending point, and the clearance groove provides space for deformation of the plate during the bending process, avoiding unnecessary squeezing damage to the plate by the inner forming block, thereby ensuring the forming quality of the inner side of the plate.

[0015] A bending method, applied to the aforementioned boiler liner multi-point synchronous bending forming device, includes the following steps: S1: Place the boiler liner plate to be bent on the upper support plate of the liftable elastic support mechanism, between the two auxiliary plates on both sides, and ensure that the plate is centered along its length so that the two ends of the plate are located within the bending action area of ​​the multi-point bending mechanism on both sides.

[0016] S2: Drive the pressing mechanism downwards so that its pressing and bending mechanism contacts and presses the middle of the plate.

[0017] S3: The pressing mechanism continues to descend, forcing the upper support plate to overcome the elastic force of the support spring and descend as a whole through the plate material. During the descent, the lower surfaces of both ends of the upper support plate contact and press against the bending rods of the first bending mechanism on both sides, completing the first bending of the plate edge. At the same time, this pressing action drives the sliding rod to slide horizontally away from the center of the upper support plate and compresses the bending spring.

[0018] S4: As the pressing mechanism continues to descend, the arc-shaped guide surfaces at both ends of the secondary bending drive plate further drive the sliding rod to slide horizontally. Its outer end drives the outer forming block of the second bending mechanism to move towards the center of the upward support plate through the drive plate, thereby performing a second bending on the edge of the sheet metal that has already undergone the first bending. When the inner forming block and the middle plate abut, the telescopic elastic column is compressed, and the inner forming blocks on both sides of the trapezoidal block expand outward along the inclined surface of the trapezoidal block, pressing the inner side of the bent sheet metal.

[0019] S5: The pressing mechanism rises and resets, and the liftable elastic support mechanism drives the upper support plate to reset under the restoring force of the support spring. At the same time, the first bending mechanism and the second bending mechanism reset under the action of the bending spring, and the formed boiler guard plate is taken out.

[0020] As can be seen from the above technical solution, the present invention has the following beneficial effects: The boiler liner multi-point synchronous bending forming device and bending method of the present invention can automatically and synchronously drive the first bending mechanism and the second bending mechanism to work sequentially through a single pressing action, so as to realize the bending forming of the edge of the plate. At the same time, it cooperates with the inner forming block to press the inner side of the plate, and completes multiple bending processes at one time, effectively reducing the number of processes, improving production efficiency, avoiding the cumulative error caused by multiple clamping and positioning, improving the accuracy of finished products, and helping to ensure the straightness of long workpieces. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the multi-point synchronous bending and forming device for boiler liner plates of the present invention; Figure 2 This is an internal schematic diagram of the boiler liner multi-point synchronous bending and forming device of the present invention; Figure 3 As shown Figure 2 A magnified view of a portion of the image; Figure 4 This is a sectional view of the horizontal axis of the first bending mechanism; Figure 5 As shown Figure 2 A partial enlarged view of the connector described in the image; Figure 6 This is a schematic diagram of the pressing mechanism; Figure 7 This is a schematic diagram of the downward bending mechanism; Figure 8This is a schematic diagram of the internal molding block.

[0022] In the diagram: 1. Pressing mechanism; 11. Top plate; 12. Secondary bending drive plate; 121. Arc-shaped guide surface; 13. Pressing and bending mechanism; 131. Trapezoidal block; 1311. Inclined surface; 1312. Flange; 1313. Limiting groove; 132. Inner forming block; 1321. Forming groove; 1322. Bending angle; 1323. Clearance groove; 133. Limiting plate; 2. Liftable elastic support mechanism; 21. Upper support plate; 22. Middle plate; 221. Guide column; 23. Bottom plate; 24. Sub- Plate; 241, oblong hole; 25, support cylinder; 26, support spring; 3, multi-point bending mechanism; 31, support block; 311, blind hole; 32, sliding rod; 33, first bending mechanism; 331, bending roller; 332, connecting rod; 333, bending spring; 34, second bending mechanism; 341, outer forming block; 342, support block; 343, rotating shaft; 344, drive plate; 345, connecting seat; 3451, mounting groove; 3452, oblong through hole; 346, pin. Detailed Implementation Example

[0023] like Figure 1 The diagram illustrates a multi-point synchronous bending and forming device for boiler liner plates, comprising a pressing mechanism 1 and a bending mechanism. The bending mechanism includes a liftable elastic support mechanism 2 for receiving the plate. Multi-point bending mechanisms 3 are located at both ends of the liftable elastic support mechanism 2. The pressing mechanism 1 includes an internal forming block for internally forming the plate. The pressing mechanism 1 presses the plate placed on the surface of the liftable elastic support mechanism 2, causing the liftable elastic support mechanism 2 to descend. As the liftable elastic support mechanism 2 descends, the multi-point bending mechanisms 3 bend the plate at multiple points.

[0024] like Figure 2 The boiler liner multi-point synchronous bending forming device shown includes a liftable elastic support mechanism 2 comprising an upper support plate 21, a middle plate 22, and a bottom plate 23. A secondary plate 24 is fixedly connected along the long side of the top surface of the middle plate 22. The secondary plate 24 is arranged parallel to both sides of the upper support plate 21 and is used to install the multi-point bending mechanism 3. A vertically arranged guide post 221 is connected to the middle plate 22, and the upper support plate 21 and the guide post 221 are slidably connected for guidance. A support cylinder 25 connects the middle plate 22 and the bottom plate 23, and a support spring 26 is installed inside the support cylinder 25. The support spring 26 passes through the middle plate 22 and abuts against the bottom surface of the upper support plate 21, forming support for the upper support plate 21.

[0025] like Figure 3The boiler liner multi-point synchronous bending forming device shown includes a multi-point bending mechanism 3 comprising a support block 31 connected to the end of the sub-plate 24. A sliding rod 32 is slidably connected to the support block 31 in the horizontal direction. A first bending mechanism 33 is connected to the inner end of the sliding rod 32, and a second bending mechanism 34 is connected to the outer end of the sliding rod 32 in a transmission connection. The second bending mechanism 34 is installed at the bottom of the support block 31. When the upper support plate 21 is driven down by the pressing mechanism 1, the first bending mechanism 33 contacts and is pressed by the upper support plate 21, thereby driving the sliding rod 32 to slide outward in the horizontal direction, and then driving the second bending mechanism 34 to move through the outer end of the sliding rod 32.

[0026] In this embodiment, the distance between the bending portion of the second bending mechanism 34 and the center of the upper support plate 21 is greater than the distance between the bending portion of the first bending mechanism 33 and the center of the upper support plate 21. During the downward pressing process, the upper support plate 21 squeezes the first bending mechanism 33 and drives the sliding rod 32, thereby sequentially driving the first bending mechanism 33 and the second bending mechanism 34 to bend the sheet metal.

[0027] like Figure 4 The boiler liner multi-point synchronous bending forming device shown includes a first bending mechanism 33 comprising a bending roller 331 connected to a connecting rod 332 and a sliding rod 32, which are coaxially connected. The diameter of the connecting rod 332 is larger than that of the sliding rod 32. A bending spring 333 is sleeved on the sliding rod 32. The bending spring 333 is located within a blind hole 311 in the support block 31. Both ends of the bending spring 333 abut against the end face of the connecting rod 332 and the bottom of the blind hole 311, respectively. Both ends of the bending roller 331 are movably connected to a horizontally extending oblong hole 241 on the sub-plate 24.

[0028] like Figure 3 The boiler liner multi-point synchronous bending and forming device shown includes a second bending mechanism 34 comprising an outer forming block 341 slidably connected to the bottom surface of a support block 31 via a guide rail slider mechanism. A support block 342 is connected to the bottom surface of the support block 31, extending away from the upper support plate 21. A rotating shaft 343 is movably connected to one end of the support block 342 away from the upper support plate 21. The rotating shaft 343 is horizontally inserted through the support block 342, and a drive plate 344 is connected to the end of the rotating shaft 343. The drive plate 344 is L-shaped. One end of the drive plate 344 is drively connected to the outer forming block 341, and the other end of the drive plate 344 is drively connected to a sliding rod 32.

[0029] like Figure 5The boiler liner multi-point synchronous bending and forming device shown has a connecting seat 345 at the connection between the outer forming block 341 and the drive plate 344. The connecting seat 345 has a mounting groove 3451, and the drive plate 344 is located in the mounting groove 3451. Horizontally extending waist-shaped through holes 3452 are provided on both sides of the mounting groove 3451. The drive plate 344 is rotatably and movably connected to the mounting groove 3451 by a pin 346.

[0030] like Figure 6-7 The boiler liner multi-point synchronous bending forming device shown includes a pressing mechanism 1 comprising a top plate 11, a secondary bending drive plate 12, and a pressing bending mechanism 13. The width of the secondary bending drive plate 12 is greater than the width of the pressing bending mechanism 13. Arc-shaped guide surfaces 121 are provided at both ends of the secondary bending drive plate 12. The pressing bending mechanism 13 includes a trapezoidal block 131. Inclined surfaces 1311 converging towards the center of the upward support plate 21 are provided on both sides of the trapezoidal block 131. Inner forming blocks 132 are slidably connected to both sides of the trapezoidal block 131, and the inner forming blocks 132 are slidably connected to the inclined surfaces 1311. The inclined surfaces 1311 are provided with flanges 1312, and the inner forming blocks 132 are provided with grooves adapted to the flanges 1312. Limiting grooves 1313 are provided on the flanges 1312. A limiting plate 133 is connected to the side of each inner forming block 132 closest to the trapezoidal block 131. When the pressing mechanism 1 and the bending mechanism separate, the limiting plate 133 abuts against the bottom surface of the limiting groove 1313 to prevent the inner forming block 132 from sliding off the trapezoidal block 131. The bottom surface of the secondary bending drive plate 12 is connected to a retractable elastic column, which is located between the secondary bending drive plate 12 and the inner forming block 132.

[0031] like Figure 8 The boiler liner multi-point synchronous bending and forming device shown has an inner forming section on the side of the inner forming block 132 away from the trapezoidal block 131. The inner forming section includes a forming groove 1321 provided along the side of the inner forming block 132. The bottom corner of the inner forming block 132 away from the trapezoidal block 131 is set as a bending angle 1322. An anti-cavity groove 1323 is provided on the side of the inner forming block 132 away from the trapezoidal block 131.

[0032] A bending method, applied to the aforementioned boiler liner multi-point synchronous bending forming device, includes the following steps: S1: Place the boiler guard plate to be bent on the surface of the upper support plate 21 of the liftable elastic support mechanism 2, between the two auxiliary plates 24, and ensure that the plate is centered along its length so that the two ends of the plate are located within the bending action area of ​​the multi-point bending mechanism 3 on both sides.

[0033] S2: Drive the pressing mechanism 1 to move downward, so that its pressing bending mechanism 13 contacts and presses the middle of the plate.

[0034] S3: The pressing mechanism 1 continues to descend, forcing the upper support plate 21 to overcome the elastic force of the support spring 26 and descend as a whole through the plate. During the descent, the lower surfaces at both ends of the upper support plate 21 contact and press the bending rods 331 of the first bending mechanism 33 on both sides, completing the first bending of the edge of the plate. At the same time, this pressing action drives the sliding rod 32 to slide horizontally away from the center of the upper support plate 21 and compresses the bending spring 333.

[0035] S4: As the pressing mechanism 1 continues to descend, the arc-shaped guide surfaces 121 at both ends of the secondary bending drive plate 12 further drive the sliding rod 32 to slide horizontally. Its outer end drives the outer forming block 341 of the second bending mechanism 34 to move towards the center of the upward support plate 21 through the drive plate 344, thereby performing a second bending on the edge of the plate that has completed the first bending. When the inner forming block 132 and the middle plate 22 abut, the telescopic elastic column is compressed, and the inner forming blocks 132 on both sides of the trapezoidal block 131 expand outward along the inclined surface 1311 of the trapezoidal block 131, pressing the inner side of the bent plate.

[0036] S5: The pressing mechanism 1 rises and resets, and the liftable elastic support mechanism 2 drives the upper support plate 21 to reset under the restoring force of the support spring 26. At the same time, the first bending mechanism 33 and the second bending mechanism 34 reset under the action of the bending spring 333, and the formed boiler guard plate is taken out.

[0037] The above embodiments are exemplary and are intended to illustrate the technical concept and features of the present invention, so that those skilled in the art can understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made according to the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A multi-point synchronous bending and forming device for boiler liner plates, characterized in that: The device includes a pressing mechanism (1) and a bending mechanism. The bending mechanism includes a liftable elastic support mechanism (2) for supporting the plate; and a multi-point bending mechanism (3) disposed at both ends of the liftable elastic support mechanism (2). The pressing mechanism (1) includes an internal forming block for internal forming of the plate. The pressing mechanism (1) presses the plate placed on the surface of the liftable elastic support mechanism (2) to make the liftable elastic support mechanism (2) descend. As the liftable elastic support mechanism (2) descends, the multi-point bending mechanism (3) bends the plate at multiple points.

2. The boiler liner multi-point synchronous bending and forming device according to claim 1, characterized in that: The liftable elastic support mechanism (2) includes an upper support plate (21), a middle plate (22), and a bottom plate (23); a sub-plate (24) is fixedly connected to the top surface of the middle plate (22) along its long side, and the sub-plate (24) is arranged parallel to both sides of the upper support plate (21) for installing a multi-point bending mechanism (3); the middle plate (22) is connected to a vertically arranged guide post (221), and the upper support plate (21) and the guide post (221) are slidably connected to achieve guidance; a support cylinder (25) is connected between the middle plate (22) and the bottom plate (23), and a support spring (26) is provided inside the support cylinder (25); the support spring (26) passes through the middle plate (22) and abuts against the bottom surface of the upper support plate (21) to form support for the upper support plate (21).

3. The boiler liner multi-point synchronous bending and forming device according to claim 2, characterized in that: The multi-point bending mechanism (3) includes a support block (31) connected to the end of the sub-plate (24); a sliding rod (32) is slidably connected to the support block (31) in the horizontal direction; the inner end of the sliding rod (32) is connected to a first bending mechanism (33), and the outer end of the sliding rod (32) is connected to a second bending mechanism (34); the second bending mechanism (34) is installed at the bottom of the support block (31); when the upper support plate (21) is driven down by the pressing mechanism (1), the first bending mechanism (33) contacts the upper support plate (21) and is squeezed by it, thereby driving the sliding rod (32) to slide outward in the horizontal direction, and then driving the second bending mechanism (34) to move through the outer end of the sliding rod (32).

4. The boiler liner multi-point synchronous bending and forming device according to claim 3, characterized in that: The bending part of the second bending mechanism (34) is farther from the center of the upper support plate (21) than the bending part of the first bending mechanism (33) is farther from the center of the upper support plate (21). During the pressing process, the upper support plate (21) squeezes the first bending mechanism (33) and drives the sliding rod (32), thereby driving the first bending mechanism (33) and the second bending mechanism (34) to bend the plate in sequence.

5. The boiler liner multi-point synchronous bending and forming device according to claim 4, characterized in that: The first bending mechanism (33) includes a bending rod (331), which is connected by a connecting rod (332) and a sliding rod (32). The connecting rod (332) and the sliding rod (32) are coaxially connected. The diameter of the connecting rod (332) is larger than that of the sliding rod (32). A bending spring (333) is sleeved on the sliding rod (32). The bending spring (333) is located in a blind hole (311) provided in the support block (31). The two ends of the bending spring (333) abut against the end face of the connecting rod (332) and the bottom of the blind hole (311), respectively. The two ends of the bending rod (331) are movably connected to a waist-shaped hole (241) extending horizontally on the sub-plate (24).

6. The boiler liner multi-point synchronous bending and forming device according to claim 5, characterized in that: The second bending mechanism (34) includes an outer forming block (341) slidably connected to the bottom surface of the support block (31) via a guide rail slider mechanism; a support block (342) is connected to the bottom surface of the support block (31), the support block (342) extends away from the upper support plate (21), and a rotating shaft (343) is movably connected to one end of the support block (342) away from the upper support plate (21); the rotating shaft (343) passes horizontally through the support block (342), and a drive plate (344) is connected to the end of the rotating shaft (343), the drive plate (344) is L-shaped; one end of the drive plate (344) is connected to the outer forming block (341) in a transmission connection, and the other end of the drive plate (344) is connected to the sliding rod (32) in a driving connection.

7. The boiler liner multi-point synchronous bending and forming device according to claim 6, characterized in that: A connecting seat (345) is provided at the connection between the outer molding block (341) and the drive plate (344). The connecting seat (345) is provided with a mounting groove (3451). The drive plate (344) is located in the mounting groove (3451). Horizontally extending waist-shaped through holes (3452) are provided on both sides of the mounting groove (3451). The drive plate (344) is rotatably and movably connected to the mounting groove (3451) by a pin (346).

8. The boiler liner multi-point synchronous bending and forming device according to claim 4, characterized in that: The pressing mechanism (1) includes a top plate (11), a secondary bending drive plate (12), and a pressing bending mechanism (13); the width of the secondary bending drive plate (12) is greater than the width of the pressing bending mechanism (13); the two ends of the secondary bending drive plate (12) are respectively provided with arc-shaped guide surfaces (121); the pressing bending mechanism (13) includes a trapezoidal block (131); the trapezoidal block (131) has inclined surfaces (1311) on both sides that converge towards the center of the upward support plate (21); the trapezoidal block (131) is slidably connected to the two sides of the trapezoidal block (132), and the inner forming block (132) and the inclined surface (1311) are slidably connected; the inclined surface (1311) is provided with The inner forming block (132) has a flange (1312) and a groove that fits the flange (1312); the flange (1312) has a limiting groove (1313); each inner forming block (132) is connected to a limiting plate (133) on the side near the trapezoidal block (131); when the pressing mechanism (1) and the bending mechanism are separated, the limiting plate (133) abuts against the bottom surface of the limiting groove (1313) to prevent the inner forming block (132) from sliding off the trapezoidal block (131); the bottom surface of the secondary bending drive plate (12) is connected to a retractable elastic column, which is located between the secondary bending drive plate (12) and the inner forming block (132).

9. The boiler liner multi-point synchronous bending and forming device according to claim 8, characterized in that: The inner forming block (132) has a bending inner forming part on the side away from the trapezoidal block (131); the bending inner forming part includes a forming groove (1321) provided along the side of the inner forming block (132); the bottom corner of the inner forming block (132) on the side away from the trapezoidal block (131) is set as a bending angle (1322); the inner forming block (132) on the side away from the trapezoidal block (131) has an anti-cavity groove (1323).

10. A bending method, applied to the boiler liner multi-point synchronous bending and forming device according to any one of claims 1-9, characterized in that: Includes the following steps: S1: Place the boiler guard plate to be bent on the surface of the upper support plate (21) of the liftable elastic support mechanism (2), between the sub-plates (24) on both sides, and ensure that the plate is centered along its length, so that the two ends of the plate are respectively located in the bending action area of ​​the multi-point bending mechanism (3) on both sides. S2: Drive the pressing mechanism (1) to move downward, so that its pressing bending mechanism (13) contacts and presses the middle of the plate; S3: The pressing mechanism (1) continues to descend, forcing the upper support plate (21) to overcome the elastic force of the support spring (26) and descend as a whole through the plate. During the descent, the lower surfaces of both ends of the upper support plate (21) contact and press the bending rods (331) of the first bending mechanism (33) on both sides, completing the first bending of the edge of the plate. At the same time, the pressing action drives the sliding rod (32) to slide horizontally away from the center of the upper support plate (21) and compress the bending spring (333). S4: As the pressing mechanism (1) continues to descend, the arc-shaped guide surfaces (121) at both ends of the secondary bending drive plate (12) further drive the sliding rod (32) to slide horizontally. Its outer end drives the outer forming block (341) of the second bending mechanism (34) to move towards the center of the upper support plate (21) through the drive plate (344), thereby performing a second bending on the edge of the plate that has completed the first bending. When the inner forming block (132) and the middle plate (22) abut, the telescopic elastic column is compressed, and the inner forming blocks (132) on both sides of the trapezoidal block (131) expand outward along the inclined surface (1311) of the trapezoidal block (131) to press the inner side of the bent plate. S5: The pressing mechanism (1) rises and resets, and the liftable elastic support mechanism (2) drives the upper support plate (21) to reset under the restoring force of the support spring (26). At the same time, the first bending mechanism (33) and the second bending mechanism (34) reset under the action of the bending spring (333) and the formed boiler guard plate is taken out.

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