Tube plate welding-free fixing tool

Abstract

This utility model relates to a weld-free tube sheet fixing fixture, comprising a heat exchanger tube sheet, a side plate, and at least one fixing fixture body. The fixing fixture body limits the position of the side plate and the heat exchanger tube sheet. The fixing fixture body consists of a first positioning plate, a second positioning plate, and an adjusting connecting rod. The two ends of the adjusting connecting rod are connected to the first and second positioning plates respectively through connectors. The first positioning plate has a first mounting hole. After the first positioning plate is attached to the heat exchanger tube sheet, it is fixed with bolts. A side plate is placed on one edge of the heat exchanger tube sheet, and its length is adjusted by the adjusting connecting rod. When the first positioning plate is in close contact with the side plate, the side plate is clamped by a clamp or fixed by bolts. The same operation is performed on the side plates on the other side of the heat exchanger tube sheet. This utility model ensures the assembly accuracy, sealing performance, and service life of the product tube bundle, reduces labor intensity, and improves the versatility of the fixture.

Description

Technical Field

[0001] This utility model relates to the field of heat exchange equipment manufacturing technology, specifically to a tube sheet fixing fixture that eliminates the need for welding. Background Technology

[0002] Heat exchangers play a vital role in various fields, including chemical production, power generation, metallurgy, shipbuilding, machinery, food processing, and pharmaceuticals. Tube sheets, a crucial component of heat exchangers, are used to fix and support the heat exchange tubes, while also serving as the connection and seal for the heat exchange medium. They are typically made of corrosion-resistant materials and, during long-term operation, must withstand axial stress from the shell and heat exchange tubes, as well as pull-out forces from the tubes. During assembly, the tube sheet may not be perfectly fixed to other parts due to dimensional accuracy and structural limitations. Misalignment of the tube sheet not only affects the final assembly accuracy of the heat exchanger but also generates shear forces on the heat exchange tube surface, potentially posing safety hazards if handled carelessly. Pre-welding using electric welding can also cause stress concentration and heat-affected zones, directly impacting the heat exchanger's performance. Therefore, to ensure the performance and lifespan of heat exchangers, the installation requirements for tube sheets are becoming increasingly stringent.

[0003] Furthermore, current domestic and international processes and tooling for fixing tube sheets are not yet perfect. Most companies use spot welding to connect the tube sheet sides and side plates, or directly fix the tube sheet to large fixtures. However, spot welding generates a large amount of heat, which creates a heat-affected zone around the welding area, causing deformation in other parts of the tube sheet, compromising its sealing performance, and leading to stress concentration. This reduces the mechanical properties and service life of the tube sheet, negatively impacting the later operation and stability of the product. Directly fixing the tube sheet to large fixtures hinders convenient operation, makes it difficult to guarantee dimensional accuracy, and makes the tube bundle cumbersome during hoisting, increasing the workload and safety risks.

[0004] To address this issue, a weld-free tube sheet fixing fixture was designed to overcome the aforementioned problems. Utility Model Content

[0005] The purpose of this utility model is to overcome the shortcomings of the existing technology and provide a tube sheet welding-free fixing fixture that is simple in structure, reliable and efficient, ensures the accuracy of assembly dimensions, avoids deformation caused by welding during tube sheet assembly, reduces stress concentration that may be caused by tube sheet assembly welding, improves the sealing performance of the product, and ensures the performance and service life of the heat exchanger.

[0006] This utility model is achieved through the following technical solution: a tube sheet welding-free fixing fixture, comprising a heat exchanger tube sheet, a side plate, and at least one fixing fixture body. The fixing fixture body limits the side plate and the heat exchanger tube sheet, facilitating the assembly of the heat exchanger tube sheet. The heat exchanger tube sheet is composed of multiple plates of the same size stacked together. Multiple through holes for heat exchanger tubes to pass through are provided on the heat exchanger tube sheet, and a ring of bolt holes is provided around the through holes at the edge of the plate. Each fixing fixture body consists of a first positioning plate, a second positioning plate, and an adjusting connecting rod. The two ends of the adjusting connecting rod are respectively connected to the first positioning plate via connectors. The first positioning plate is connected to the second positioning plate. The first positioning plate has a first mounting hole corresponding to the bolt holes of the heat exchanger tube sheet. After the first positioning plate is attached to the heat exchanger tube sheet, it is fixed by bolts passing through the first mounting hole and the bolt hole in sequence. A side plate is placed on one side edge of the heat exchanger tube sheet. The length is adjusted by adjusting the connecting rod. When the first positioning plate is close to the side plate, an isosceles right triangle is formed between the heat exchanger tube sheet, the side plate and the adjusting connecting rod. The side plate is then clamped by clamps or fixed by bolts. The same operation is performed on the other side of the heat exchanger tube sheet to improve the overall assembly speed and accuracy.

[0007] Preferably, the adjusting connecting rod consists of a first connecting rod and a second connecting rod. The diameter of the first connecting rod is smaller than that of the second connecting rod. The second connecting rod is hollow inside. The first connecting rod is inserted into the second connecting rod and slides up and down within it to adjust the overall length. A limiting block with a diameter larger than the first connecting rod but smaller than the second connecting rod is fitted onto one end of the first connecting rod. One end of the second connecting rod extends inward to form a limiting edge with an inner diameter smaller than that of the limiting block. This edge is used to limit the limiting block and prevent it from falling out. An external thread is provided on the first connecting rod near the limiting block, and a locking nut is fitted onto it. This nut is used to lock the connecting rod after the length adjustment is completed. The other ends of the first and second connecting rods are movably connected to the first and second positioning plates, respectively, via connectors for easy angle adjustment.

[0008] Preferably, the connector consists of two connecting shafts, with corresponding connecting holes at both ends of the adjusting connecting rod and on the first and second positioning plates. The two connecting shafts pass through the connecting holes at both ends of the adjusting connecting rod and are then inserted into the connecting holes of the first and second positioning plates and fixed by nuts or bearings, which facilitates vertical angle adjustment between the adjusting connecting rod and the first and second positioning plates.

[0009] Preferably, the first positioning plate is a long strip-shaped folded plate bent at 90 degrees. One side of the folded plate is a mounting surface, on which a first mounting hole corresponding to the bolt hole is opened. The other side is a connecting surface, on which a connecting hole for inserting a connecting shaft is opened. The second positioning plate is a rectangular pressure plate. After the pressure plate is attached to the side plate, it is clamped by a clamp or fixed by bolts.

[0010] Preferably, the first mounting hole is at least two elliptical holes, which facilitates assembly.

[0011] Preferably, the limiting block is a bearing, used to reduce friction between the inner walls of the first connecting rod and the second connecting rod during length adjustment.

[0012] Compared with the prior art, the advantages of this utility model are as follows:

[0013] Compared with traditional tube sheet fixing assembly, the tube sheet fixing fixture of this utility model improves the assembly efficiency by 3 times; the deviation of the overall size of the tube bundle assembled with the tube sheet reaches within 1mm; the deformation of the tube sheet after assembly is within 0.2mm; the success rate of the sealing test is increased to more than 95%; stress concentration is reduced; and an important guarantee is provided for the long-term stable operation of the product.

[0014] This utility model has a simple overall structure, is reliable and efficient, ensures the accuracy of assembly dimensions, avoids deformation caused by welding during tube sheet assembly, reduces stress concentration that may result from tube sheet assembly welding, improves the sealing performance of the product, and ensures the performance and service life of the heat exchanger. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0016] Figure 2 for Figure 1 A schematic diagram of direction A.

[0017] Figure 3 This is a partially enlarged structural diagram of the adjusting connecting rod in this utility model.

[0018] Figure 4 This is a schematic diagram of the assembly structure of this utility model. Detailed Implementation

[0019] To enable those skilled in the art to more clearly understand the purpose, technical solution and advantages of this utility model, the present utility model will be further described below in conjunction with the accompanying drawings and embodiments.

[0020] In the description of this utility model, it should be understood that the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "inner", "outer", "horizontal", and "vertical" are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0021] The present invention will now be described in detail with reference to the accompanying drawings: Figure 1-3 As shown, a weld-free tube sheet fixing fixture includes a heat exchanger tube sheet 1, a side plate 2, and at least one fixing fixture body. The fixing fixture body limits the side plate 2 and the heat exchanger tube sheet 1, facilitating the assembly of the heat exchanger tube sheet 1. The heat exchanger tube sheet 1 is composed of multiple plates of the same size stacked together. Multiple through holes 3 for heat exchanger tubes to pass through are provided on the heat exchanger tube sheet, and a ring of bolt holes 4 is provided around the through holes 3 at the edge of the plates. Each fixing fixture body consists of a first positioning plate 5, a second positioning plate 6, and an adjusting connecting rod 7. The two ends of the adjusting connecting rod 7 are respectively connected to the first positioning plate 5 and the second positioning plate 6 via connectors. The connection is achieved by opening a first mounting hole 8 on the first positioning plate 5, which corresponds to the bolt hole 4 of the heat exchanger tube sheet 1. After the first positioning plate 5 is attached to the heat exchanger tube sheet 1, it is fixed by bolts passing through the first mounting hole 8 and the bolt hole 4 in sequence. A side plate 2 is placed on one side edge of the heat exchanger tube sheet 1, and its length is adjusted by adjusting the connecting rod. When the first positioning plate 5 is close to the side plate 2, an isosceles right triangle is formed between the heat exchanger tube sheet 1, the side plate 2 and the adjusting connecting rod 7. The side plate 2 is then clamped by a clamp or fixed by bolts. The same operation is performed on the other side of the heat exchanger tube sheet 1, thereby improving the overall assembly speed and accuracy.

[0022] The weldless fixing fixture designed in this invention features adjustable length and rotation angle. The fixing length can be finely adjusted according to the size of the tube sheet, and the assembly angle can be adjusted by axial rotation according to the fixing angle, ensuring high precision in each assembly dimension of the product. Preferably, two fixing fixture bodies are used, one on each side of each tube sheet, ensuring balanced force distribution during tube sheet fixing. Of course, the number of fixing fixture bodies can be adjusted according to actual needs to meet specific requirements, without any limitation.

[0023] like Figure 4As shown, the adjusting connecting rod 7 consists of a first connecting rod 9 and a second connecting rod 10. The diameter of the first connecting rod 9 is smaller than the diameter of the second connecting rod 10. The second connecting rod 10 is hollow inside. The first connecting rod 9 is inserted into the second connecting rod 10 and slides up and down in the second connecting rod 10 to adjust the overall length. A limiting block 11 with a diameter larger than the first connecting rod 9 and smaller than the second connecting rod 10 is fitted at one end of the first connecting rod 9. One end of the second connecting rod 10 extends inward to form a limiting edge 12. The inner diameter of the limiting edge 12 is smaller than the diameter of the limiting block 11, which is used to limit the limiting block 11 and prevent it from falling out. An external thread is provided on the rod body of the first connecting rod 9 near the limiting block 11, and a locking nut 16 is fitted on it. After the length of the adjusting connecting rod 7 is adjusted, it is locked by the locking nut 16. The other ends of the first connecting rod 9 and the second connecting rod 10 are movably connected to the first positioning plate 5 and the second positioning plate 6 respectively through connectors for convenient angle adjustment.

[0024] The connector consists of two connecting shafts 13, with corresponding connecting holes at both ends of the adjusting connecting rod 7 and on the first positioning plate 5 and the second positioning plate 6. The two connecting shafts 13 pass through the connecting holes at both ends of the adjusting connecting rod and are then inserted into the connecting holes of the first positioning plate 5 and the second positioning plate 6 and fixed by nuts or bearings, which facilitates the vertical angle adjustment between the adjusting connecting rod 7 and the first positioning plate 5 and the second positioning plate 6.

[0025] The first positioning plate 5 is a long strip-shaped folded plate bent at 90 degrees. One side of the folded plate is the mounting surface 14, on which a first mounting hole 8 corresponding to the bolt hole 4 is opened. The other side is the connecting surface 15, on which a connecting hole for inserting the connecting shaft 13 is opened. The second positioning plate 6 is a rectangular pressure plate. After the pressure plate is attached to the side plate 2, it is clamped by a clamp or fixed by bolts.

[0026] The first mounting hole 8 has at least two elliptical holes for easy assembly. The limiting block 11 is a bearing used to reduce friction between the inner wall of the first connecting rod 9 and the inner wall of the second connecting rod 10 during length adjustment.

[0027] The working process of this utility model is as follows:

[0028] like Figure 2 and Figure 4As shown, with the heat exchanger tube sheet as the reference, the side plate is placed perpendicular to the heat exchanger tube sheet, and the gap between the two is appropriately controlled. After assembling the adjusting connecting rod, it is connected to the first positioning plate and the second positioning plate respectively through the connecting shaft. The fixed fixture body formed after assembly is used for fixing and adjustment. After the first positioning plate aligns with the screw holes on the front of the heat exchanger tube sheet through the first mounting hole, it is fixed with two bolts. According to the size of the tube sheet and the fixing height, the angle of the connecting shaft of the second positioning plate is rotated so that the heat exchanger tube sheet, the side plate and the adjusting connecting rod are fixed in an isosceles right triangle. At the same time, the overall length of the adjusting connecting rod is adjusted by the first connecting rod and the second connecting rod. After adjustment, it is locked by the locking nut on the outside of the first connecting rod. The bearing of the first connecting rod is used to reduce the friction during tightening. After the length and angle of the adjusting connecting rod are finely adjusted, the second positioning plate and the side plate are connected by the clamp. Connect the other side of the tube sheet using the same steps as above. After all the heat exchange tubes are assembled, install the other side of the tube sheet and adjust and fix it in the same way as the first side of the tube sheet. The locking nut on the outside of the first connecting rod can also adjust the overall length of the tube bundle. Tighten the locking nut on the outside of the first connecting rod according to the deviation to fine-tune the tube bundle size to the drawing requirements, ensuring the accuracy and stability of the overall assembly.

[0029] This utility model replaces conventional tube sheet assembly, solving the problems of deformation and internal stress caused by welding during assembly; large tooling is complex to operate and has a large workload, ensuring the assembly accuracy, sealing performance and service life of the product tube bundle, as well as stable operation in the later stage, reducing the workload and improving the versatility of the tooling.

[0030] The specific embodiments described herein are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A tube sheet welding-free fixing fixture, comprising a heat exchanger tube sheet (1), a side plate (2), and at least one fixing fixture body, wherein the fixing fixture body limits the side plate (2) and the heat exchanger tube sheet (1) to facilitate the assembly of the heat exchanger tube sheet (1), wherein the heat exchanger tube sheet (1) is composed of multiple plates of the same size stacked together, and multiple through holes (3) for heat exchanger tubes to pass through are provided on the heat exchanger tube sheet, and a ring of bolt holes (4) is provided around the through holes (3) at the edge of the plate, characterized in that: Each of the aforementioned fixed fixture bodies consists of a first positioning plate (5), a second positioning plate (6), and an adjusting connecting rod (7). The two ends of the adjusting connecting rod (7) are connected to the first positioning plate (5) and the second positioning plate (6) respectively through connectors. A first mounting hole (8) corresponding to the bolt hole (4) of the heat exchanger tube sheet (1) is provided on the first positioning plate (5). After the first positioning plate (5) is attached to the heat exchanger tube sheet (1), bolts are used to sequentially pass through the first mounting hole (8) and the bolt... The hole (4) is fixed, and a side plate (2) is placed on one side edge of the heat exchanger tube sheet (1). The length is adjusted by adjusting the connecting rod. When the first positioning plate (5) is close to the side plate (2), an isosceles right triangle is formed between the heat exchanger tube sheet (1), the side plate (2) and the adjusting connecting rod (7). The side plate (2) is clamped by the clamp or fixed by the bolt. The same operation is performed on the side plate (2) on the other side of the heat exchanger tube sheet (1) to improve the overall assembly speed and accuracy.

2. The tube sheet welding-free fixing fixture according to claim 1, characterized in that: The adjusting connecting rod (7) consists of a first connecting rod (9) and a second connecting rod (10). The diameter of the first connecting rod (9) is smaller than the diameter of the second connecting rod (10). The second connecting rod (10) is hollow inside. The first connecting rod (9) is inserted into the second connecting rod (10) and slides up and down in the second connecting rod (10) to adjust the overall length. A limiting block (11) with a diameter larger than the first connecting rod (9) and smaller than the second connecting rod (10) is fitted at one end of the first connecting rod (9). One end of the second connecting rod (10) extends inward to form a circle. The limiting edge (12) has an inner diameter smaller than that of the limiting block (11) and is used to limit the limiting block (11) to prevent it from falling out. An external thread is provided on the first connecting rod (9) near the limiting block (11) and a locking nut (16) is provided to lock the connecting rod (7) after the length adjustment is completed. The other ends of the first connecting rod (9) and the second connecting rod (10) are respectively connected to the first positioning plate (5) and the second positioning plate (6) through connecting parts to facilitate angle adjustment.

3. The tube sheet welding-free fixing fixture according to claim 2, characterized in that: The connector consists of two connecting shafts (13), and corresponding connecting holes are provided at both ends of the adjusting connecting rod (7) and on the first positioning plate (5) and the second positioning plate (6). After the two connecting shafts (13) pass through the connecting holes at both ends of the adjusting connecting rod, they are inserted into the connecting holes of the first positioning plate (5) and the second positioning plate (6) and fixed by nuts or bearings, so as to facilitate the vertical angle adjustment between the adjusting connecting rod (7) and the first positioning plate (5) and the second positioning plate (6).

4. The tube sheet welding-free fixing fixture according to claim 3, characterized in that: The first positioning plate (5) is a long strip-shaped folded plate bent at 90 degrees. One side of the folded plate is the mounting surface (14), and a first mounting hole (8) corresponding to the bolt hole (4) is opened on the mounting surface. The other side is the connecting surface (15), and a connecting hole for inserting the connecting shaft (13) is opened on the connecting surface (15). The second positioning plate (6) is a rectangular pressure plate. After the pressure plate is attached to the side plate (2), it is clamped by a clamp or fixed by bolts.

5. The tube sheet welding-free fixing fixture according to claim 4, characterized in that: The first mounting hole (8) consists of at least two elliptical holes for easy assembly.

6. The tube sheet welding-free fixing fixture according to claim 2 or 5, characterized in that: The limiting block (11) is a bearing used to reduce friction between the inner walls of the first connecting rod (9) and the second connecting rod (10) during length adjustment.

Images