A positioning device and positioning method for welding a heat exchanger lug to a tube sheet

Abstract

The application discloses a positioning device and method for welding of a support lug of a heat exchanger and a tube plate, wherein the positioning device for welding of the support lug of the heat exchanger and the tube plate comprises a fixing mechanism and a positioning mechanism; the fixing mechanism is connected with the positioning mechanism, and is used for fixing the positioning mechanism on the tube plate; the positioning mechanism is used for positioning an installation position of the support lug on the tube plate according to a preset support lug offset angle; the positioning mechanism is provided with an adjusting mechanism, the adjusting mechanism is detachably connected with the support lug, and the adjusting mechanism is used for adjusting the position of the support lug on the positioning mechanism. The problems that, in the prior art, when the anti-loose support lug is installed, the tube box flange needs to be directly contacted and compared with the tube plate to position, the operation is troublesome, and the workload is increased; or when the installation position on the tube plate is determined according to drawings, the positioning is inaccurate, and the subsequent connection with the support lug is difficult or impossible.

Description

Technical Field

[0001] This invention relates to the field of heat exchanger processing and manufacturing, specifically to a positioning device and method for welding heat exchanger lugs to tube sheets. Background Technology

[0002] Anti-loosening lugs are an important component of heat exchangers, serving three main functions: 1. Preventing tube bundle rotation; 2. Securing the tube sheet and shell flanges during tube box disassembly and inspection of tube joints; 3. Facilitating tube bundle removal. Generally, smaller diameter tube bundles require two anti-loosening lugs, while larger diameter tube bundles typically require four. For a complete heat exchanger unit, after the tube sheet and tube heads have been pressure tested, the anti-loosening lugs need to be assembled and welded after the tube sheet flange bolt holes are aligned with the tube sheet position. This alignment requires moving the large tube sheet and flanges, making the operation cumbersome. For single tube bundles or equipment requiring heat treatment after tube sheet and tube head welding, the anti-loosening lugs need to be welded beforehand during tube bundle installation. In this case, the installation position on the tube sheet needs to be found according to the position and angle shown in the drawings. However, since the angle of the anti-loosening lugs off the horizontal line of the tube sheet center is usually a single-digit value, it is difficult to determine the assembly and welding position. If the anti-loosening lugs are not welded accurately on the tube sheet, it will lead to difficulties in subsequent connections with flanges and other equipment. Summary of the Invention

[0003] In view of this, the present invention provides a positioning device and positioning method for welding heat exchanger lugs to tube sheets, so as to solve the problems that in the past, when installing anti-loosening lugs, it was necessary to directly contact and compare the positions of the tube box flange and the tube sheet, which was not only cumbersome to operate but also increased the workload; or when determining the installation position on the tube sheet according to the drawings, it was easy to cause inaccurate positioning, resulting in difficulties or inability to connect with the lugs later.

[0004] In a first aspect, the present invention provides a positioning device for welding heat exchanger lugs to tube sheets, comprising: a fixing mechanism and a positioning mechanism;

[0005] The fixing mechanism is connected to the positioning mechanism, and the fixing mechanism is used to fix the positioning mechanism to the tube sheet;

[0006] The positioning mechanism is used to locate the installation position of the lug on the tube sheet according to the preset lug offset angle;

[0007] The positioning mechanism has an adjustment mechanism, which is detachably connected to the lug and is used to adjust the position of the lug on the positioning mechanism.

[0008] Preferably, the positioning mechanism includes: an angle display and a pointer;

[0009] The front of the angle display is used for displaying the angle;

[0010] The front of the angle display is used for displaying the angle;

[0011] The pointer is used for positioning the installation position of the ear on the tube plate through the angle display according to the preset ear offset angle.

[0012] Preferably, the angle display is a dial;

[0013] The front of the dial is connected with the pointer, and the back is connected with the fixing mechanism.

[0014] Preferably, the fixing mechanism comprises a first clamping piece and a second clamping piece;

[0015] The first clamping piece and the second clamping piece are respectively inserted into the tube plate hole on the tube plate;

[0016] The first clamping piece and the second clamping piece are connected through an elastic piece, and the elastic piece is used for making the first clamping piece and the second clamping piece close to each other by the elasticity of the elastic piece, so as to be clamped on the tube plate;

[0017] The positioning mechanism is connected with the first clamping piece and / or the second clamping piece.

[0018] Preferably, the first clamping piece is a first positioning clamping piece;

[0019] The second clamping piece is a second positioning clamping piece;

[0020] The elastic piece is a spring;

[0021] The first positioning clamping piece and the second positioning clamping piece are connected in an axis;

[0022] The second positioning clamping piece is connected with the positioning mechanism;

[0023] One end of the spring is connected with one end of the first positioning clamping piece, and the other end is connected with one end of the second positioning clamping piece;

[0024] Both ends of the first positioning clamping piece and both ends of the second positioning clamping piece are respectively provided with fixing pieces, and the fixing pieces are used for being fixed by being inserted into the tube plate hole.

[0025] Preferably, it further comprises an adjustable fixing clamping piece;

[0026] One end of the adjustable fixing clamping piece is connected with the second positioning clamping piece in an axis;

[0027] The first sliding groove is arranged on the adjustable fixed clamping piece, and the fixing piece is slidably arranged in the first sliding groove.

[0028] Preferably, the adjusting mechanism comprises a second sliding groove and a connecting piece.

[0029] The second sliding groove is arranged on the positioning mechanism, and the connecting piece is slidably connected to the second sliding groove, and the connecting piece is used for connecting the lug.

[0030] In a second aspect, the present application provides a positioning method for welding a lug of a heat exchanger with a tube plate, comprising a positioning device for welding a lug of a heat exchanger with a tube plate as described above, and specifically comprising the following steps:

[0031] The first lug is connected to the positioning mechanism through the adjusting mechanism, and the positioning mechanism is fixed on the tube plate at an intermediate position through the fixing mechanism.

[0032] An offset angle of the first lug is obtained, and a position offset according to the offset angle of the first lug is positioned on the tube plate through the positioning mechanism based on a horizontal line of the center of the tube plate, and the position is a first installation position.

[0033] The position of the first lug on the positioning mechanism is adjusted through the adjusting mechanism, so that the first lug moves to the first installation position, and the positioning of the first lug is completed.

[0034] The adjusting mechanism is separated from the first lug, and the adjusting mechanism is connected to the second lug.

[0035] An offset angle of the second lug is obtained, and a position offset according to the offset angle of the second lug is positioned on the tube plate through the positioning mechanism based on a horizontal line of the center of the tube plate, and the position is a second installation position.

[0036] The position of the second lug on the positioning mechanism is adjusted through the adjusting mechanism, so that the second lug moves to the second installation position, and the positioning of the second lug is completed.

[0037] The present application has the following beneficial effects:

[0038] The present application provides a positioning device and a positioning method for welding a lug of a heat exchanger with a tube plate, to solve the problem that in the prior art, when installing a lug, the tube box flange needs to be directly contacted and compared with the tube plate, which is not only troublesome to operate, but also increases the workload; or when determining the installation position on the tube plate according to the drawing, it is easy to cause inaccurate positioning, leading to the problem of difficult or impossible connection with the lug. BRIEF DESCRIPTION OF DRAWINGS

[0039] The above and other objects, features and advantages of the present application will become more apparent from the following description when taken in conjunction with the accompanying drawings, in which:

[0040] Figure 1 is a structural schematic view of a positioning device for welding a support lug and a tube plate of a heat exchanger according to an embodiment of the present application.

[0041] In the figure, 1 is a tube plate, 2 is a support lug, 3 is a pointer, 4 is a connecting piece, 5 is a scale dial, 6 is a first positioning clamping piece, 7 is a second positioning clamping piece, 8 is a fixing piece, 9 is a spring, 10 is an adjustable positioning clamping piece, 11 is a first sliding channel, and 12 is a second sliding channel. DETAILED DESCRIPTION

[0042] The present application is described in detail below based on embodiments, but it is worth noting that the present application is not limited to these embodiments. In the following detailed description of the present application, some specific details are described in detail. However, those skilled in the art can fully understand the present application without the detailed description of the parts.

[0043] In addition, those of ordinary skill in the art should understand that the provided drawings are only for the purpose of illustrating the purposes, features and advantages of the present application, and the drawings are not actually drawn to scale.

[0044] At the same time, unless the context clearly requires otherwise, the terms "comprise", "comprising", and the like in the specification and claims should be interpreted as including the meaning of "including but not limited to".

[0045] Figure 1 is a structural schematic view of a positioning device for welding a support lug and a tube plate of a heat exchanger according to an embodiment of the present application. In the figure, the position of the intersection of the lines on the tube plate is the position of the hole of the tube plate. As shown in Figure 1 A positioning device for welding a support lug and a tube plate of a heat exchanger, comprising: a fixing mechanism and a positioning mechanism; the fixing mechanism is connected to the positioning mechanism, and the fixing mechanism is used to fix the positioning mechanism on the tube plate 1; the positioning mechanism is used to position the installation position of the support lug 2 on the tube plate 1 according to a preset support lug 2 offset angle; the positioning mechanism has an adjusting mechanism, the adjusting mechanism is detachably connected to the support lug 2, and the adjusting mechanism is used to adjust the position of the support lug 2 on the positioning mechanism.

[0046] In the embodiment of the present application, when installing, the first anti-loosening lug 2 is connected with the adjusting mechanism, and then the fixing mechanism is fixed on the tube plate 1, at this time, the position of the positioning mechanism is in the middle position of the tube plate 1; according to the preset lug 2 offset angle of the first anti-loosening lug 2, the position of the lug 2 after offset according to the preset lug 2 offset angle is found on the tube plate 1 by the positioning mechanism, taking the horizontal line of the center of the tube plate 1 as the reference, and the position of the outer circumferential surface of the tube plate 1 corresponding to the position is the installation position of the first anti-loosening lug 2; the first anti-loosening lug 2 is moved on the positioning mechanism by the adjusting mechanism until it moves to the installation position of the first anti-loosening lug 2, and finally the first anti-loosening lug 2 is welded with the tube plate 1. After the first anti-loosening lug 2 is installed, the adjusting mechanism is separated from the first anti-loosening lug 2, and the second anti-loosening lug 2 is connected with the adjusting mechanism, according to the preset lug 2 offset angle of the second anti-loosening lug 2, the position of the lug 2 after offset according to the preset lug 2 offset angle is found on the tube plate 1 by the positioning mechanism, taking the horizontal line of the center of the tube plate 1 as the reference, and the position of the outer circumferential surface of the tube plate 1 corresponding to the position is the installation position of the second anti-loosening lug 2; the second anti-loosening lug 2 is moved on the positioning mechanism by the adjusting mechanism until it moves to the installation position of the second anti-loosening lug 2, and finally the second anti-loosening lug 2 is welded with the tube plate 1. If four or more anti-loosening lugs 2 need to be installed, the positioning step is the same as above.

[0047] The preset offset angle of the anti-loosening lug 2 is generally determined according to the position of the bolt hole on the circumferential surface of the tube box end, and the positions of the bolt holes, the flange bolt holes and the lug 2 bolt holes of the tube box need to be accurately matched to be successfully connected. Taking the horizontal line of the center of the tube box end face as the reference, the included angle between the line connecting the two bolt holes on the tube box to be connected with the anti-loosening lug 2 and the horizontal line of the center of the tube box is the preset offset angle of the lug 2 on the tube plate 1, for example, the angle between one bolt hole of the tube box and the horizontal line of the center of the tube box is 18 degrees, and the angle between the other bolt hole and the horizontal line of the center of the tube box is 198 degrees, then the first anti-loosening lug 2 is fixed on the tube plate 1 with a horizontal line of the tube plate 1 as the reference and offset by 18 degrees, and the other lug 2 is fixed after offset by 198 degrees. After the anti-loosening lugs 2 are installed, the tube plate 1 bolt holes and the flange bolt holes are aligned with the bolt holes on the anti-loosening lugs 2, and then they are connected and fixed by bolts.

[0048] In the present application and Figure 1 The positioning mechanism comprises an angle display and a pointer 3; the front surface of the angle display is used to display the angle; the front surface of the angle display is connected with the pointer 3, and the back surface is connected with the fixing mechanism, and the pointer 3 is provided with the adjusting mechanism; the pointer 3 is used to position the installation position of the lug 2 on the tube plate 1 according to the preset lug 2 offset angle through the angle display.

[0049] In the embodiment of the present application, one end of the pointer 3 is connected to the middle of the angle display, the length of the pointer 3 should be greater than the radius of the end face of the tube plate 1, that is, the other end of the pointer 3 should exceed the edge of the peripheral surface of the tube plate 1. The adjusting mechanism is installed on the pointer 3, and the adjusting mechanism is connected to the anti-loosening lug 2. The angle display is fixed in the middle of the tube plate 1 by the fixing mechanism, and the angle information is displayed on the angle display. According to the angle information, with the horizontal line of the center of the tube plate 1 as the reference, the connecting point of the pointer 3 and the angle display as the shaft, the pointer 3 is rotated by the preset offset angle of the lug 2, for example, the offset angle is 18 degrees, then the pointer 3 is rotated by 18 degrees with the horizontal line of the center of the tube plate 1 as the reference, that is, the pointer 3 points to the 18-degree position on the angle display. After the pointer 3 is rotated, the position of the other end of the pointer 3 corresponding to the outer circumference of the tube plate 1 is the installation position. The position of the anti-loosening lug 2 on the pointer 3 is adjusted by the adjusting mechanism, the anti-loosening lug 2 is moved to the installation position on the outer circumference of the tube plate 1, and finally the lug 2 is welded with the tube plate 1. The angle information is accurately displayed by the angle display, and the positioning is performed by rotating the pointer 3, so that the determined installation position is more accurate.

[0050] In the embodiment of the present application, Figure 1 the angle display is a scale disc 5, the front surface of the scale disc 5 is connected to the shaft pointer 3, and the back surface is connected to the fixing mechanism.

[0051] In the embodiment of the present application, 360-degree scale information is displayed on the scale disc 5, and when installed, the 0-degree and 180-degree positions on the scale disc 5 are on the same straight line with the horizontal line of the center of the tube plate 1. The pointer 3 is rotated according to the angle information displayed on the scale disc 5 by the preset offset angle of the lug 2.

[0052] In the embodiment of the present application, Figure 1 the fixing mechanism comprises a first clamping piece and a second clamping piece, the first clamping piece and the second clamping piece are respectively inserted into the tube plate holes in the tube plate 1, the first clamping piece and the second clamping piece are connected by an elastic piece, the elastic piece is used to make the first clamping piece and the second clamping piece close to each other by the elasticity of the elastic piece, so as to be clamped on the tube plate 1, and a positioning mechanism is connected to the first clamping piece and / or the second clamping piece.

[0053] In this embodiment of the invention, since the original structure of the tube sheet 1 cannot be changed, the existing holes on the tube sheet 1 for connecting the tube bundles are used to fix the fixing mechanism to the tube sheet 1. During installation, the dial 5 is positioned in the center of the tube sheet 1. The parts of the first clamping member and the second clamping member connected to the elastic element are moved away from each other, thereby stretching and deforming the elastic element. The first clamping member and the second clamping member, after being moved away, are inserted into the corresponding holes in the tube sheet, thus completing the fixing. Since the tube sheet holes connect to the tube bundles, the first clamping member and the second clamping member are inserted into the corresponding tube bundles at the same time as they are inserted into the tube sheet holes. After the first clamping member and the second clamping member are inserted into the tube sheet holes, the elastic element connecting them uses its own elasticity to bring them closer together, thereby fixing the first clamping member and the second clamping member to the tube sheet 1.

[0054] In this invention and Figure 1 In this design, the first clamping element is a first positioning clamp 6; the second clamping element is a second positioning clamp 7; the elastic element is a spring 9; the first positioning clamp 6 and the second positioning clamp 7 are axially connected; the second positioning clamp 7 is connected to the positioning mechanism; one end of the spring 9 is connected to one end of the first positioning clamp 6, and the other end is connected to one end of the second positioning clamp 7; both ends of the first positioning clamp 6 and both ends of the second positioning clamp 7 are respectively equipped with fixing elements 8, which are used for fixing by inserting into the tube sheet hole.

[0055] In the embodiment of the present application, the bodies of the first positioning clamping piece 6 and the second positioning clamping piece 7 are rectangular, the middle part of one side of the first positioning clamping piece 6 and one side of the second positioning clamping piece 7 are connected by a pin shaft, and the other side of the second positioning clamping piece 7 is connected with the dial 5. The other side of the first positioning clamping piece 6 close to the two end positions is connected with one end of four fixing pieces 8, respectively. The body of the fixing piece 8 is a cylinder, and the diameter of the fixing piece 8 should be slightly smaller than the inner diameter of the tube bundle connected with the tube plate 1. In use, the dial 5 is placed in the middle position of the tube plate 1, the other end of the fixing piece 8 at the two ends of the first positioning clamping piece 6 is inserted into the corresponding hole of the tube plate, the one end of the second positioning clamping piece 7 is moved away from the one end of the first positioning clamping piece 6, so that the spring 9 connected between the one end of the first positioning clamping piece 6 and the one end of the second positioning clamping piece 7 is elongated and deformed, and then the other end of the fixing piece 8 at the two ends of the second positioning clamping piece 7 is inserted into the corresponding hole of the tube plate. The force of the one end of the first positioning clamping piece 6 and the one end of the second positioning clamping piece 7 moving close to each other is generated by the elasticity of the spring 9, and at the same time, the fixing piece 8 is clamped in the hole of the tube plate, so that the first positioning clamping piece 6 and the second positioning clamping piece 7 are clamped on the tube plate 1. Through the four fixing pieces 8 connected between the two ends of the first and second positioning clamping pieces 7, cooperating with the four tube plate holes, the dial 5 and the pointer 3 are more stably fixed on the tube plate 1 through four-point fixing, preventing the dial 5 or the pointer 3 from shaking or falling when rotating. Since bolts, glue or nails are not used for fixing, installation and disassembly are more convenient, and after positioning is completed, the fixing piece 8 on the positioning clamping piece can be pulled out of the hole of the tube plate. The one end of the first positioning clamping piece 6 and the one end of the second positioning clamping piece 7 are connected by the spring 9, so that the distance between the first positioning clamping piece 6 and the second positioning clamping piece 7 is convenient to adjust, which can better cooperate with the position of the tube plate hole. The fixing piece 8 can be a bolt.

[0056] In the embodiment of the present application and Figure 1 The adjustable fixing clamping piece is further included: one end of the adjustable fixing clamping piece is connected with the second positioning clamping piece 7 by a shaft; the adjustable fixing clamping piece has a first sliding channel 11, and the fixing piece 8 is slidably installed in the first sliding channel 11.

[0057] In the embodiment of the present application, the body of the adjustable fixing piece is rectangular, and one end is connected with the middle position shaft of the second positioning piece 7. The first sliding channel 11 is a rectangular first through hole arranged on the adjustable fixing piece 8 near the other end, and the first end of the fixing piece 8 is movably connected in the first through hole, so that the fixing piece 8 can move back and forth in the first through hole. The direction of the two ends of the through hole is consistent with the direction of the two ends of the adjustable fixing piece. In use, in addition to being fixed by the first and second positioning pieces 7, the adjustable fixing piece can also be used for fixing, so that the dial 5 and the pointer 3 are more stable. The adjustable fixing piece is rotated around the connection point of the one end of the adjustable fixing piece and the second fixing piece, and the position of the tube plate hole to be connected is found in the area passed during rotation. If the position of the tube plate hole deviates from the position of the fixing piece 8 of the adjustable fixing piece, the position of the fixing piece 8 can be adjusted by moving the fixing piece 8 in the first through hole, so that the fixing piece 8 can be smoothly inserted into the tube plate hole to be inserted.

[0058] In the present application and Figure 1 The adjusting mechanism comprises a second sliding channel 12 and a connecting piece 4. The second sliding channel 12 is installed on the positioning mechanism, and the connecting piece 4 is movably connected to the second sliding channel 12 and used for connecting the supporting lug 2.

[0059] In the embodiment of the present application, the second sliding channel 12 is a rectangular second through hole on the pointer 3, and the connecting piece 4 is movably installed in the second through hole and can move back and forth in the second through hole. The two ends of the second through hole are close to the two ends of the pointer 3. The connecting piece 4 can be a bolt. In use, the connecting piece 4 is connected with the supporting lug 2, that is, connected with the bolt hole on the supporting lug 2 through the bolt. According to the preset offset angle of the supporting lug 2, the pointer 3 is rotated until the position on the tube plate 1 after offset is reached. At this time, the connecting piece 4 is close to the other end of the pointer 3 in the second sliding channel 12. The connecting piece 4 is moved towards the one end of the pointer 3 until the supporting lug 2 is tightly attached to the circumferential surface of the tube plate 1. At this time, the position where the supporting lug 2 is attached to the tube plate 1 is the installation position of the supporting lug 2. The supporting lug 2 and the tube plate 1 are welded together, thereby completing the installation of the supporting lug 2.

[0060] In the application, a positioning method for welding a support lug of a heat exchanger with a tube plate comprises the positioning device for welding the support lug of the heat exchanger with the tube plate, and specifically comprises the following steps: Step 1: connecting the first support lug with the positioning mechanism through the adjusting mechanism, and fixing the positioning mechanism at an intermediate position on the tube plate through the fixing mechanism; Step 2: obtaining the offset angle of the first support lug, positioning the position offset according to the offset angle of the first support lug on the tube plate based on the horizontal line of the center of the tube plate, and the position is the first installation position; Step 3: adjusting the position of the first support lug on the positioning mechanism through the adjusting mechanism, moving the first support lug to the first installation position, and then completing the positioning of the first support lug; Step 4: separating the adjusting mechanism from the first support lug, and connecting the adjusting mechanism with the second support lug; Step 5: obtaining the offset angle of the second support lug, positioning the position offset according to the offset angle of the second support lug on the tube plate based on the horizontal line of the center of the tube plate, and the position is the second installation position; and Step 6: adjusting the position of the second support lug on the positioning mechanism through the adjusting mechanism, moving the second support lug to the second installation position, and then completing the positioning of the second support lug.

[0061] The anti-loose support lug 2 is generally installed in pairs during installation, thereby playing a fixing role, and the offset angle of the support lug 2 needs to be determined through the identification on the tube plate drawing or determined through actual measurement and calculation of the connection hole position of the equipment to be connected. The included angle between the line connecting the bolt hole on the tube plate to be connected with the support lug 2 to the center point of the tube plate and the horizontal line of the center of the tube plate is the offset angle of the support lug 2 on the tube plate 1, and the offset angle may be an integer, but may also be a decimal number. The bolt hole on the support lug 2 and the bolt hole position on the tube plate 1 need to be accurately corresponding, so as to fix the bolt. At this time, it is necessary to more accurately position the installation position of the support lug 2 on the tube plate 1.

[0062] Step 1: connecting the first support lug with the positioning mechanism through the adjusting mechanism, and fixing the positioning mechanism at an intermediate position on the tube plate through the fixing mechanism.

[0063] In the embodiment of the application, during positioning, the first support lug 2 is connected with the connecting piece 4 on the pointer 3 of the positioning mechanism, and the scale disc 5 of the positioning mechanism is placed at the center position of the tube plate 1. The first positioning clamping piece 6 and the second positioning clamping piece 7 are separated by a certain distance, the spring 9 is taut, and then the four fixing pieces 8 on the first positioning clamping piece 6 and the second positioning clamping piece 7 are inserted into the corresponding bolt holes on the tube plate 1 and fixed.

[0064] Step 2: obtaining the offset angle of the first support lug, positioning the position offset according to the offset angle of the first support lug on the tube plate based on the horizontal line of the center of the tube plate, and the position is the first installation position.

[0065] In the embodiment of the present application, the angle between the line connecting the first bolt hole of the first lug 2 to the center of the tube sheet and the horizontal line of the center of the tube sheet is measured on the tube sheet, and the angle is the offset angle of the first lug 2. The horizontal line of the center of the tube sheet corresponds to the horizontal line of the center of the tube plate 1. The pointer 3 is rotated based on the horizontal line of the center of the tube plate 1, and the rotation angle is the same as the offset angle of the first lug 2. The other end of the pointer 3 reaches the offset position on the tube plate 1. At this time, the position on the circumferential surface of the tube plate 1 corresponding to the other end of the pointer 3 is the first installation position, and the position corresponds to the position of the first bolt hole on the tube sheet.

[0066] Step 3: The position of the first lug on the positioning mechanism is adjusted by the adjusting mechanism, so that the first lug moves to the first installation position, and the positioning of the first lug is completed.

[0067] In the embodiment of the present application, the first lug 2 moves to the first installation position by moving the connecting piece 4 in the second sliding channel 12 of the pointer 3, that is, the first lug 2 is close to the circumferential surface of the tube plate 1. The first lug 2 is welded with the tube plate 1.

[0068] Step 4: The adjusting mechanism is separated from the first lug, and the adjusting mechanism is connected with the second lug.

[0069] In the embodiment of the present application, the connecting piece 4 is separated from the first lug 2, and then the second lug is connected with the connecting piece 4.

[0070] Step 5: The offset angle of the second lug is obtained, and the position offset according to the offset angle of the second lug is positioned on the tube plate by the positioning mechanism based on the horizontal line of the center of the tube plate. The position is the second installation position.

[0071] In the embodiment of the present application, the angle between the line connecting the second bolt hole of the second lug 2 to the center of the tube sheet and the horizontal line of the center of the tube sheet is measured on the tube sheet, and the angle is the offset angle of the second lug 2. The horizontal line of the center of the tube sheet corresponds to the horizontal line of the center of the tube plate 1. The pointer 3 is rotated based on the horizontal line of the center of the tube plate 1, and the rotation angle is the same as the offset angle of the second lug 2. The other end of the pointer 3 reaches the offset position on the tube plate 1. At this time, the position on the circumferential surface of the tube plate 1 corresponding to the other end of the pointer 3 is the second installation position, and the position corresponds to the position of the second bolt hole on the tube sheet.

[0072] Step 6: The position of the second lug on the positioning mechanism is adjusted by the adjusting mechanism, so that the second lug moves to the second installation position, and the positioning of the second lug is completed.

[0073] In the embodiment of the present application, the second lug 2 is moved to the second mounting position by moving the connecting piece 4 in the second slide 12 of the pointer 3, i.e. the second lug 2 is close to the circumferential surface of the tube plate 1. Finally, the second lug 2 is welded with the tube plate 1.

[0074] The present application effectively solves the positioning problem of the anti-loose lug and the tube plate welding, and the angle size of the anti-loose lug after the assembly welding meets the drawing requirements. The present application has the advantages of reasonable design, simple structure, high accuracy, low production cost, etc., and has good experimental application effect, so that the installation of the anti-loose lug is easy and has high operability, and the stable operation of the production device is ensured.

[0075] The above embodiments are only to express the embodiments of the present application, and the description is more specific and detailed, but it cannot be understood as the limitation of the patent scope of the present application. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the present application, a number of modifications, equivalent replacements, improvements, etc. can be made, which all belong to the protection scope of the present application. Therefore, the protection scope of the present application patent should be subject to the appended claims.

Claims

1. A positioning device for the welding of a heat exchanger gilled lug to a tube sheet, characterized in that, The application relates to a positioning device for heat exchanger gusset and tube plate welding. The positioning device comprises a fixing mechanism and a positioning mechanism; the fixing mechanism is connected with the positioning mechanism and is used for fixing the positioning mechanism on a tube plate (1); the positioning mechanism is used for positioning the installation position of a gusset (2) on the tube plate (1) according to a preset gusset (2) offset angle; the positioning mechanism is provided with an adjusting mechanism which is detachably connected with the gusset (2) and is used for adjusting the position of the gusset (2) on the positioning mechanism; the positioning mechanism comprises a scale disc and a pointer; the fixing mechanism comprises a first clamping piece and a second clamping piece; the first clamping piece and the second clamping piece are connected through an elastic piece, the elastic piece is a spring; the first clamping piece is a first positioning clamping piece, the second clamping piece is a second positioning clamping piece; the middle part of one side of the first positioning clamping piece and one side of the second positioning clamping piece is connected through a pin shaft; the two ends of the first positioning clamping piece and the two ends of the second positioning clamping piece are respectively provided with fixing pieces; in use, the scale disc is arranged at the middle position of the tube plate, the fixing pieces at the two ends of the first positioning clamping piece are inserted into the corresponding holes of the tube plate, the one end of the second positioning clamping piece is moved away from the first positioning clamping piece, the spring is elongated and deformed, the fixing pieces at the two ends of the second positioning clamping piece are inserted into the corresponding holes of the tube plate, and the first positioning clamping piece and the second positioning clamping piece are clamped on the tube plate; the positioning device further comprises an adjustable fixing clamping piece; one end of the adjustable fixing clamping piece is connected with the second positioning clamping piece through a shaft; the adjustable fixing clamping piece is provided with a first sliding groove, and a fixing piece is slidably arranged in the first sliding groove; the adjustable fixing clamping piece is rotated around the connection point between the one end of the adjustable fixing clamping piece and the second positioning clamping piece; the position of the hole of the tube plate which is desired to be connected is found in the area passed through during the rotation; if the position of the hole of the tube plate deviates from the position of the fixing piece of the adjustable fixing clamping piece, the position of the fixing piece can be adjusted by moving the fixing piece in the first through hole, so that the fixing piece (8) can be smoothly inserted into the hole of the tube plate which is desired to be connected. The positioning mechanism comprises an angle display and a pointer (3); the front surface of the angle display is used for displaying an angle; the front surface of the angle display is connected with the pointer (3) through a shaft, and the back surface is connected with the fixing mechanism; the pointer (3) is provided with the adjusting mechanism; the pointer (3) is used for positioning the installation position of the gusset (2) on the tube plate (1) according to a preset gusset (2) offset angle through the angle display. The front surface of the scale disc (5) is connected with the pointer (3) through a shaft, and the back surface is connected with the fixing mechanism.

4. The positioning device for heat exchanger gusset and tube plate welding according to claim 1, wherein the elastic piece is used for making the first clamping piece and the second clamping piece approach each other through the elasticity of the elastic piece, so as to be clamped on the tube plate (1); the positioning mechanism is connected with the first clamping piece and / or the second clamping piece. The adjusting mechanism comprises a second sliding groove (12) and a connecting piece (4); the positioning mechanism is provided with the second sliding groove (12), the second sliding groove (12) is slidably connected with the connecting piece (4), and the connecting piece (4) is used for connecting the gusset (2). ​ ​ ​ ​ 2. The positioning device for the welding of the support lugs of the heat exchanger to the tube sheet according to claim 1, characterized in that, ​ ​ ​ ​ 3. The positioning device for the welding of the support lugs of the heat exchanger to the tube sheet according to claim 2, characterized in that ； ​ ​ ​ ​ 5. The positioning device for the welding of the support lugs of the heat exchanger to the tube sheet according to any one of claims 1 to 4, characterized in that, ​ ​ 6. A method for positioning a gilled tube sheet of a heat exchanger, comprising the positioning device for a gilled tube sheet of a heat exchanger according to any one of claims 1 to 5, characterized in that, The method comprises the steps of: connecting the first lug to the adjusting mechanism and the positioning mechanism, and fixing the positioning mechanism to the intermediate position on the tube plate through the fixing mechanism; obtaining the first lug offset angle, and positioning the position offset according to the first lug offset angle on the tube plate through the positioning mechanism, taking the horizontal line of the center of the tube plate as the reference, and the position is the first installation position; adjusting the position of the first lug on the positioning mechanism through the adjusting mechanism, and moving the first lug to the first installation position, so that the positioning of the first lug is completed; disconnecting the adjusting mechanism from the first lug, and connecting the adjusting mechanism to the second lug; obtaining the second lug offset angle, and positioning the position offset according to the second lug offset angle on the tube plate through the positioning mechanism, taking the horizontal line of the center of the tube plate as the reference, and the position is the second installation position; adjusting the position of the second lug on the positioning mechanism through the adjusting mechanism, and moving the second lug to the second installation position, so that the positioning of the second lug is completed.

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