Mass flow meter welding tool and welding method

Abstract

The invention relates to a mass flow meter welding tool and a welding method. The welding tool comprises a base, a measuring tube positioning assembly, a coil support positioning assembly and a manifold supporting assembly. The multiple measuring tube positioning assemblies are arranged on the base corresponding to the positions of the measuring tubes and used for positioning and supporting the measuring tubes. The multiple coil support positioning assemblies are arranged on the base corresponding to the positions of the coil supports respectively. The coil support positioning assembly comprises a support positioning seat and a support mounting block arranged on the support positioning seat, the support positioning seat is arranged on the base in a sliding mode, the support mounting block is made of electrode materials, the support mounting block is connected with the support positioning seat in an insulating mode, and the support mounting block is provided with a mounting groove used for mounting a coil support. The manifold supporting assembly is arranged on the base corresponding to the position of the manifold and used for positioning and supporting the manifold. According to the welding tool, the positioning precision of the measuring pipe assembly can be improved, the welding efficiency and quality are improved, and the assembling precision is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of flow meter manufacturing, in particular to a mass flow meter welding tool and welding method. BACKGROUND

[0002] The Coriolis flow meter measurement principle is based on the Coriolis principle, which directly measures the mass flow by measuring the Coriolis force generated by the fluid flowing in the vibrating flow tube. The measurement tube assembly composed of the measurement tube, the coil support, the fixing block and the like in the Coriolis flow meter is the core component, and in particular, the positioning accuracy of the coil support and the balance and symmetry on the vibrating tube have a great influence on the performance of the flow meter.

[0003] At present, for the positioning problem of the coil support of the Coriolis flow meter, auxiliary tools are often used for measurement or tooling is used for positioning. However, after positioning, the problem of how to fix the coil support and the deformation of the measurement tube assembly during the welding process still exists.

[0004] Therefore, it is urgent to provide a tool and method for reliably positioning and welding the measurement tube assembly. SUMMARY

[0005] An object of the present application is to solve the problems existing in the prior art and provide a mass flow meter welding tool. To solve the above technical problems, the present application adopts the following technical solutions: A mass flow meter welding tool, comprising: a base; a plurality of measurement tube positioning assemblies, which are arranged on the base corresponding to the positions of the measurement tubes and are used for positioning and supporting the measurement tubes; a plurality of coil support positioning assemblies, which are arranged on the base corresponding to the positions of the coil supports, the coil support positioning assembly comprising a support positioning seat and a support mounting block provided on the support positioning seat, the support positioning seat being slidably arranged on the base, the support mounting block being made of electrode material, the support mounting block being insulatively connected with the support positioning seat, and the support mounting block being provided with a mounting groove for mounting the coil support; a manifold support assembly, which is arranged on the base corresponding to the position of the manifold and is used for positioning and supporting the manifold.

[0006] In one embodiment, a connecting portion is provided on the support mounting block, and the connecting portion is used for electrical connection with the resistance welding machine.

[0007] In one embodiment, the coil support positioning assembly comprises an insulating block made of insulating material, the insulating block being arranged between the support mounting block and the support positioning seat, and the support mounting block being connected and fixed with the support positioning seat through the insulating block.

[0008] In one embodiment, the plurality of coil support positioning assemblies includes a top support positioning assembly and two side support positioning assemblies. The top support positioning assembly is used to position one coil support at the middle of the transverse section of the measuring tube, and the two side support positioning assemblies are used to position two coil supports at the top positions of two longitudinal sections of the measuring tube, respectively.

[0009] In one embodiment, the bottom side of the bracket positioning seat is provided with a first flange, and the base is provided with a first sliding groove. The bottom end of the bracket positioning seat can extend into the first sliding groove, and the bottom surface of the first flange can abut against the top surface of the base, so that the bracket positioning seat can be supported and connected to the base and can move along the first sliding groove.

[0010] In one embodiment, the mass flow meter welding fixture includes a stop assembly disposed on a base and located outside the transverse section of the measuring tube. The stop assembly has a stop block for abutting against the outside of the transverse section of the measuring tube, and the stop block is made of insulating material.

[0011] In one embodiment, the measuring tube positioning assembly includes a tube positioning seat, a tube positioning block, and a tube pressing block. The bottom of the tube positioning seat is connected to the base, the tube positioning block is connected to the top of the tube positioning seat, and the tube pressing block is detachably connected to the tube positioning block. The tube positioning block and the tube pressing block are respectively provided with clamping grooves for clamping the measuring tube on their opposite sides. The tube positioning block and the tube pressing block are made of insulating material.

[0012] In one embodiment, a second flange is provided on the bottom side of the tube positioning seat; The base is provided with a second sliding groove, the bottom end of the tube positioning seat can extend into the second sliding groove, and the bottom surface of the second flange can abut against the top surface of the base, so that the tube positioning seat can be supported and connected to the base and can move along the second sliding groove. Alternatively, the base is provided with a first positioning groove, the bottom end of the tube positioning seat can be inserted into the first positioning groove, and the bottom surface of the second flange can abut against the top surface of the base.

[0013] In one embodiment, the mass flow meter welding fixture includes a clamping block assembly disposed between two adjacent tube bodies of the measuring tube and used to fix the two adjacent tube bodies of the measuring tube.

[0014] In one embodiment, the mass flow meter welding fixture includes a connector assembly, and there are multiple connector assemblies, which are respectively disposed at the edge of the base. The connector assembly includes a connector terminal, which is electrically connected to the bracket mounting block. Another object of the present invention is to provide a welding method for a mass flow meter, using the welding fixture described in any of the above claims, the welding method comprising the following steps: The measuring tube is positioned and installed using the measuring tube positioning assembly; The coil support is positioned and installed using the coil support positioning assembly. The support mounting block of the coil support positioning assembly is electrically connected to the resistance welding machine to form a current loop between the measuring tube, the coil support, the support mounting block, and the resistance welding machine, and to complete the welding and fixing of the measuring tube and the coil support.

[0015] In one embodiment, after the measuring tube and coil support are welded and fixed, the process further includes: Ensure that both the measuring tube and the coil bracket are properly positioned and installed on the welding fixture; Connect the manifold to the measuring tube, support the manifold with the manifold support assembly, and weld the manifold to the measuring tube for fixation.

[0016] In one embodiment, prior to the step of positioning and installing the measuring tube using the measuring tube positioning assembly, the method further includes: Install the vibrating plate at the predetermined position on the measuring tube; After the measuring tube positioning assembly completes the positioning and installation of the measuring tube, the vibrating pad is attached to the measuring tube positioning assembly for positioning. After welding and fixing the measuring tube and coil bracket, keep the vibrating plate in contact with the measuring tube positioning assembly, and weld and fix the vibrating plate to the measuring tube.

[0017] In one embodiment, prior to the step of positioning and installing the coil bracket using the coil bracket positioning assembly, the method further includes: The coil bracket is pre-installed and fixed on the bracket mounting block of the coil bracket positioning assembly.

[0018] As can be seen from the above technical solution, the present invention has at least the following advantages and positive effects: In this invention, the welding fixture includes a base, a measuring tube positioning assembly, a coil support positioning assembly, and a manifold support assembly. Multiple measuring tube positioning assemblies reliably and stably position the measuring tube on the base. Multiple coil support positioning assemblies precisely position the coil supports, ensuring the positioning accuracy of each coil support and its balance and symmetry on the measuring tube. The coil support positioning assembly includes a support mounting block made of electrode material, facilitating resistance welding of the coil supports and significantly improving welding efficiency and quality. Furthermore, the manifold support assembly supports the manifold, ensuring the precise fit between the manifold and the measuring tube, thereby improving the overall assembly efficiency and accuracy of the flow meter. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the mass flow meter used in the welding fixture and welding method of this invention.

[0020] Figure 2 This is a schematic diagram showing the usage state of the welding fixture in an embodiment of the present invention.

[0021] Figure 3 yes Figure 2 The diagram shows a top view of the welding fixture.

[0022] Figure 4 yes Figure 3 A schematic diagram of the base in the structure shown.

[0023] Figure 5 yes Figure 2 The diagram shows the structural schematic of the measuring tube positioning assembly of the welding fixture.

[0024] Figure 6 yes Figure 2 The diagram shows the structural schematic of the stop assembly of the welding fixture.

[0025] Figure 7 yes Figure 2 A schematic diagram of the side support positioning assembly of the welding fixture shown.

[0026] Figure 8 yes Figure 2 A schematic diagram of the top support positioning assembly of the welding fixture shown.

[0027] Figure 9 yes Figure 2 The diagram shows the structural schematic of the pressure block assembly of the welding fixture.

[0028] Figure 10 This is a schematic flowchart of the welding method according to an embodiment of the present invention.

[0029] The annotations in the attached figures are explained as follows: 10-Mass flow meter; 11-Measuring tube; 111-U-shaped tube body; 112-Longitudinal tube section; 113-Transverse tube section; 12-Coil support; 121-Detection support; 122-Drive support; 13-Vibrating plate; 14-Manifold; 20-Base; 21-Central axis; 22-Foot; 23-First slide groove; 24-Second slide groove; 25-First positioning groove; 26-Second positioning groove; 30-Measuring tube positioning assembly; 31-Tube body positioning seat; 311-Second flange; 32-Tube body positioning block; 33-Tube body clamping block; 34-Clamping groove; 40-Coil bracket positioning assembly; 401-Top bracket positioning assembly; 402-Side bracket positioning assembly; 41-Bracket positioning seat; 411-First flange; 42-Bracket mounting block; 421-Mounting groove; 422-Connecting part; 43-Insulating block; 50-Manifold support assembly; 60-Stop assembly; 61-Stop block; 62-Stop seat; 621-Third flange; 70 - Clamping block assembly; 71 - Clamping block; 711 - Clamping groove; 80 - Connector assembly; 81 - Connector terminal; 82 - Base body. Detailed Implementation

[0030] Typical embodiments embodying the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention can have various variations in different embodiments without departing from the scope of the present invention, and the descriptions and illustrations herein are for illustrative purposes only and not intended to limit the present invention.

[0031] In the description of this application, it should be understood that, in the embodiments shown in the accompanying drawings, the indications of direction or positional relationships (such as up, down, left, right, front, and back, etc.) are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. These descriptions are appropriate when these elements are in the positions shown in the accompanying drawings. If the description of the positions of these elements changes, these directional indications also change accordingly.

[0032] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0033] The present invention provides a mass flow meter welding fixture (hereinafter referred to as welding fixture), which is used to position and install the mass flow meter 10 so as to perform welding operations between the components of the mass flow meter 10, thereby ensuring the welding accuracy of the mass flow meter 10 and improving the welding quality.

[0034] It should be noted that the reference Figure 1 As shown, the core component of the mass flow meter 10 is the measuring tube assembly, which includes the measuring tube 11, coil support 12, and fixing block (vibrating plate 13). The measuring tube 11 is the sensing element and typically has several shapes, including U-shaped, Ω-shaped, S-shaped, straight tube, and spiral. The measuring tube 11 also comes in dual-tube and single-tube types. During the fabrication of the measuring tube assembly, the coil support 12 and vibrating plate 13 are usually fixed to the predetermined positions of the measuring tube 11 by welding. After the measuring tube assembly is welded, it needs to be assembled and welded to the main body of the flow meter (manifold 14).

[0035] refer toFigure 1 and Figure 2 As shown, the following embodiments of the present invention all use welding fixtures for positioning and installing mass flow meters 10, including double-tube and U-shaped measuring tubes 11. However, those skilled in the art should understand that in order to apply the design of the welding fixture to the positioning and installation of mass flow meters 10 with measuring tubes 11 of other shapes and types, various modifications, additions, substitutions, deletions, or other changes can be made to the specific embodiments described below. These changes are still within the scope of the principles of the welding fixture and welding method proposed in this invention.

[0036] For example, such as Figure 1 and Figure 2 As shown, the illustrations provided in the following embodiments of the present invention are only for the purpose of illustrating a Coriolis flow meter (including a mass flow meter 10 with a dual-tube, U-shaped measuring tube 11) and thereby providing a detailed description of the design. The components related to the design in each illustration are only shown using the Coriolis flow meter with the illustrated structure. In actual implementation, the type, quantity, and proportion of each component can be arbitrarily changed depending on the structure of the Coriolis flow meter, and the component layout may also be more complex.

[0037] refer to Figure 1 As shown, the measuring tube 11 of the present invention includes two U-shaped tubes 111 running parallel to each other. Each U-shaped tube 111 includes two longitudinal tube segments 112 and one transverse tube segment 113. The two longitudinal tube segments 112 and one transverse tube segment 113 are constructed to form a symmetrical U-shaped tube 111.

[0038] Please see Figure 2 As shown, the mass flow meter welding fixture of this embodiment includes a base 20, a measuring tube positioning assembly 30, a coil support positioning assembly 40, and a manifold support assembly 50. Multiple measuring tube positioning assemblies 30 are arranged on the base 20 corresponding to the positions of the measuring tube 11, and are used to position and support the measuring tube 11.

[0039] Multiple coil support positioning assemblies 40 are arranged on the base 20, corresponding to the positions of the coil supports 12. Each coil support positioning assembly 40 includes a support positioning seat 41 and a support mounting block 42 disposed on the support positioning seat 41. The support positioning seat 41 is slidably mounted on the base 20. The support mounting block 42 is made of electrode material and is insulated from the support positioning seat 41. The support mounting block 42 has a mounting groove 421 for mounting the coil supports 12. A manifold support assembly 50 is arranged on the base 20 corresponding to the position of the manifold 14 and is used to position and support the manifold 14.

[0040] The mass flow meter welding fixture of this embodiment of the invention uses multiple measuring tube positioning components 30 to reliably and stably position and install the measuring tube 11 on the base 20. Multiple coil support positioning components 40 can precisely position the coil supports 12, ensuring the positioning accuracy of each coil support 12 and its balance and symmetry on the measuring tube 11. The coil support positioning component 40 includes a support mounting block 42 made of electrode material, which facilitates the positioning welding of the coil supports 12 using resistance welding, greatly improving welding efficiency and quality. Furthermore, the manifold support component 50 supports the manifold 14, ensuring the fitting accuracy between the manifold 14 and the measuring tube 11, thereby improving the overall assembly efficiency and accuracy of the flow meter.

[0041] like Figure 2 As shown, the base 20 can be a rectangular plate structure. The top surface of the base 20 can serve as a positioning plane, which requires a high degree of flatness. For example, the flatness requirement of the top surface of the base 20 is ≤0.04mm.

[0042] Optionally, the base 20 may be provided with multiple feet 22 at the bottom, and each foot 22 may be an adjustable foot 22 to adjust the height as needed and ensure the overall stability of the base 20.

[0043] See Figure 3 and Figure 4 For ease of explanation, a longitudinal central axis 21 is defined on the top surface of the base 20. When the measuring tube 11 is positioned in the welding fixture, the projection of the symmetry line of each U-shaped tube body 111 of the measuring tube 11 onto the top surface of the base 20 coincides with this central axis 21. Furthermore, the direction perpendicular to the central axis 21 is defined as transverse.

[0044] like Figure 2 and Figure 3 As shown, in one example, the measuring tube positioning assembly 30 can be configured as four. The four measuring tube positioning assemblies 30 are arranged in pairs, with each pair of two measuring tube positioning assemblies 30 distributed symmetrically on both sides of the central axis 21 of the base 20 at a lateral interval. The two measuring tube positioning assemblies 30 located on the same side of the central axis 21 are arranged longitudinally at intervals and are used to position and support the longitudinal tube segment 112 of the measuring tube 11. Thus, the four measuring tube positioning assemblies 30 can reliably and stably position and install the measuring tube 11 on the base 20, and can precisely define the lateral position of the measuring tube 11.

[0045] See Figure 5Optionally, the measuring tube positioning assembly 30 may include a tube positioning seat 31, a tube positioning block 32, and a tube pressing block 33. The tube positioning seat 31 may be made of metal to ensure sufficient overall strength of the measuring tube positioning assembly 30. The bottom of the tube positioning seat 31 is connected to the base 20. For example, such as Figure 4 and Figure 5 As shown, the bottom of the tube positioning seat 31 is connected to the base 20 in the following manner: a second flange 311 is provided on the bottom side of the tube positioning seat 31, and a second sliding groove 24 is provided on the base 20. The bottom end of the tube positioning seat 31 can extend into the second sliding groove 24, and the bottom surface of the second flange 311 can abut against the top surface of the base 20, so that the tube positioning seat 31 can be supported and connected to the base 20 and can move along the second sliding groove 24.

[0046] Alternatively, the bottom end of the tube positioning seat 31 can be directly inserted into the first positioning groove 25 provided on the base 20, and the bottom surface of the second flange 311 can abut against the top surface of the base 20, so that the tube positioning seat 31 can be positioned and installed on the base 20. That is, the tube positioning seat 31 and the base 20 cannot move relative to each other in a direction parallel to the top surface of the base 20.

[0047] For example, see reference Figure 3 and Figure 4 As shown, the bottoms of the tube body positioning seats 31 of the two measuring tube positioning assemblies 30 located on the left side of the central axis 21 can be inserted into the corresponding first positioning grooves 25, and the bottoms of the tube body positioning seats 31 of the two measuring tube positioning assemblies 30 located on the right side of the central axis 21 can be slidably disposed in the corresponding second sliding grooves 24. (Refer to...) Figure 4 As shown, the second sliding groove 24 on the base 20 and the transverse center line of the first positioning groove 25 at the symmetrical position are collinear to ensure the positional accuracy of the left and right measuring tube positioning components 30 at the symmetrical position.

[0048] In this embodiment, when positioning and installing the measuring tube 11, the positions of the two measuring tube positioning components 30 on the right side can be adjusted as needed to facilitate the installation of the measuring tube 11 and to a certain extent simplify the positioning steps. Optionally, the clearance between the tube positioning seat 31 and the base 20 shall not be greater than 0.03mm, and the perpendicularity of the tube positioning seat 31 relative to the base 20 during the mating process shall be less than 0.03mm.

[0049] Further, see Figure 5 A connecting through hole can be provided on the second flange 311 of the tube positioning seat 31. This connecting through hole can be used to pass through fasteners such as screws or pins. The connecting through hole can be an elongated hole. Correspondingly, such as... Figure 4As shown, positioning holes can be provided on both sides of the longitudinal direction of the second sliding groove 24 and the longitudinal direction of the first positioning groove 25 on the base 20. The positioning holes can be circular. After the tube positioning seat 31 is moved into place or inserted into position, fasteners are inserted into the connecting through hole and the corresponding positioning hole to fix the measuring tube positioning assembly 30 on the base 20, thereby ensuring reliable positioning of the measuring tube 11.

[0050] It is understood that in other embodiments, the tube positioning seats 31 of the four measuring tube positioning components 30 may also be configured to be slidably connected to the base 20, and the specific configuration can be made as needed.

[0051] See Figure 5 As shown, the tube positioning block 32 is connected to the top of the tube positioning seat 31. For example, the tube positioning block 32 and the tube positioning seat 31 can be connected and fixed by a pin structure or a screw structure.

[0052] The tube body pressing block 33 is detachably connected to the tube body positioning block 32. The tube body positioning block 32 and the tube body pressing block 33 are respectively provided with clamping grooves 34 for clamping the measuring tube 11 on their opposite sides.

[0053] like Figure 5 As shown, corresponding to the structure of the double-tube measuring tube 11, the tube positioning block 32 and the tube pressing block 33 each have two clamping grooves 34 on their opposite sides to simultaneously clamp and fix the upper and lower U-shaped tube bodies 111 of the measuring tube 11. The shape and dimensions of each clamping groove 34 are adapted to the circumferential shape and dimensions of the measuring tube 11. After the tube pressing block 33 and the tube positioning block 32 are connected, the measuring tube 11 can be clamped and fixed between the tube pressing block 33 and the tube positioning block 32. Furthermore, the tube positioning block 32 and the tube pressing block 33 are made of insulating material.

[0054] Optionally, the tube body pressure block 33 and the tube body positioning block 32 can be detachably connected and fixed using a pin structure or a screw structure.

[0055] Optionally, pin holes can be provided on the pipe body pressing block 33, the pipe body positioning block 32 and the pipe body positioning seat 31 respectively. The same pin can be used to connect and fix the pipe body pressing block 33, the pipe body positioning block 32 and the pipe body positioning seat 31 relative to each other to ensure the alignment accuracy of the three.

[0056] See Figure 2 In one embodiment, the mass flow meter welding fixture includes a stop assembly 60, which is disposed on the base 20 and located outside the transverse section 113 of the measuring tube 11.

[0057] like Figure 6As shown, the stop assembly 60 is provided with a stop block 61 for abutting against the outside of the transverse tube section 113 of the measuring tube 11. The stop block 61 is made of insulating material.

[0058] In this embodiment, the stop assembly 60 is used to abut against the outer side of the transverse tube section 113 of the measuring tube 11, thereby limiting the position of the measuring tube 11 in the longitudinal direction and ensuring the positional accuracy of the measuring tube 11. That is, the present invention can limit and fix the position of the measuring tube 11 in the longitudinal and transverse directions respectively through the stop assembly 60 and the four measuring tube positioning assemblies 30, ensuring the positioning accuracy of the measuring tube 11.

[0059] Optionally, the stop assembly 60 may include a stop seat 62, with a stop block 61 fixed to the top of the stop seat 62. Figure 6 As shown, corresponding to the structure of the double-tube measuring tube 11, the number of stop blocks 61 provided on the stop seat 62 is two, so as to abut against the transverse tube sections 113 of the upper and lower U-shaped tube bodies 111 of the measuring tube 11 respectively.

[0060] Optionally, the stop block 61 and the stop seat 62 can be connected and fixed by a pin structure or a screw structure.

[0061] The stop seat 62 can be made of metal to ensure sufficient overall strength of the stop assembly 60. See also Figure 4 and Figure 6 The stop seat 62 and the base 20 can be connected as follows: the base 20 has a second positioning groove 26, and the bottom end of the stop seat 62 can be directly inserted into the second positioning groove 26. The bottom side wall of the stop seat 62 has a third flange 621, the bottom surface of which abuts against the top surface of the base 20, allowing the stop seat 62 to be reliably supported on the base 20. Optionally, the third flange 621 can have through holes for fasteners, and the base 20 can have corresponding positioning holes on both sides of the second positioning groove 26, thereby achieving the connection and fixation between the stop seat 62 and the base 20.

[0062] Optionally, the clearance between the stop seat 62 and the base 20 shall not exceed 0.03 mm. The two stops 61 are designed to be coplanar with the surfaces of the measuring tube 11, and both are perpendicular to the top surface of the base 20.

[0063] like Figure 2 As shown, in one example of the present invention, there may be three coil support positioning assemblies 40. The three coil support assemblies 12 include one top support positioning assembly 401 and two side support positioning assemblies 402. The top support positioning assembly 401 is used to position one coil support 12 in the middle of the transverse tube segment 113 of the measuring tube 11. Typically, the coil support 12 fixed to the middle of the transverse tube segment 113 of the measuring tube 11 is a drive support 122 for mounting the drive coil, as detailed in [reference needed].Figure 1 As shown.

[0064] The two side bracket positioning assemblies 402 are used to position the two coil brackets 12 at the top positions of the two longitudinal tube sections 112 of the measuring tube 11. Typically, the two coil brackets 12 fixed to the two longitudinal tube sections 112 of the measuring tube 11 are two detection brackets 121 used to install the detection coils, as detailed in [reference needed]. Figure 1 As shown.

[0065] Among them, one top bracket positioning assembly 401 and two side bracket positioning assemblies 402 have positional accuracy requirements. See Figure 3 Specifically, the two side bracket positioning assemblies 402 should be symmetrical about the central axis 21 on the base 20. The longitudinal centerline of the top bracket positioning assembly 401 should coincide with the central axis 21 on the base 20. Thus, after each coil bracket 12 is positioned by the corresponding coil bracket positioning assembly 40, the balance and symmetry of each coil bracket 12 on the measuring tube 11 can be ensured, thereby ensuring the detection accuracy of the flow meter.

[0066] In this embodiment, a top bracket positioning assembly 401 and two side bracket positioning assemblies 402 can be used to position the corresponding coil bracket 12 at a predetermined position on the measuring tube 11, thereby ensuring the positioning accuracy of each coil bracket 12.

[0067] like Figure 7 and Figure 8 As shown, the top bracket positioning assembly 401 and the side bracket positioning assembly 402 have roughly the same structure. For example, each coil bracket positioning assembly 40 includes a bracket positioning seat 41 and a bracket mounting block 42 disposed on the bracket positioning seat 41. The bracket positioning seat 41 can be made of metal to ensure sufficient overall strength of the coil bracket positioning assembly 40.

[0068] The bracket positioning seat 41 is slidably mounted on the base 20. (Reference) Figure 4 , Figure 7 and Figure 8 Optionally, the bottom side of the bracket positioning seat 41 is provided with a first flange 411, and the base 20 is provided with a first sliding groove 23. The bottom end of the bracket positioning seat 41 can extend into the first sliding groove 23, and the bottom surface of the first flange 411 can abut against the top surface of the base 20, so that the bracket positioning seat 41 can be supported and connected to the base 20 and can move along the first sliding groove 23. By slidably arranging each bracket positioning seat 41 on the base 20, it is convenient to put in the measuring tube 11 to be positioned, improve the ease of use of the welding fixture, and broaden the application range of the welding fixture.

[0069] It should be noted that the reference Figure 4Corresponding to the arrangement of one top support positioning assembly 401 and two side support positioning assemblies 402, three first sliding grooves 23 can be formed on the base 20. The three first sliding grooves 23 are respectively arranged for one top support positioning assembly 401 and two side support positioning assemblies 402. The symmetry requirement between the two first sliding grooves 23 corresponding to the two side support positioning assemblies 402 and the first sliding groove 23 corresponding to the top support positioning assembly 401 is ≤0.03mm. Furthermore, the transverse centerlines of the two first sliding grooves 23 corresponding to the two side support positioning assemblies 402 are collinear to ensure the positional accuracy of the two side support positioning assemblies 402. Therefore, by setting the arrangement position of each first sliding groove 23, the positional accuracy of one top support positioning assembly 401 and two side support positioning assemblies 402 can be ensured, which in turn helps to ensure the balance and symmetry of each coil support 12 on the measuring tube 11, thus ensuring the detection accuracy of the flow meter.

[0070] Optionally, the clearance between each bracket positioning seat 41 and the base 20 shall not exceed 0.03 mm, and the perpendicularity of each bracket positioning seat 41 relative to the base 20 during the fit shall be less than 0.03 mm.

[0071] Further, refer to Figure 7 and Figure 8 A connecting through hole can be provided on the first flange 411 of the bracket positioning seat 41, which can be used to pass through fasteners such as screws or pins. The connecting through hole can be an elongated hole. Correspondingly, positioning holes can be provided on both sides of each first sliding groove 23 on the base 20. These positioning holes can be circular holes. After the bracket positioning seat 41 is moved into place, fasteners passing through the connecting through hole and the corresponding positioning hole can fix the coil bracket positioning assembly 40 on the base 20, thereby ensuring reliable positioning of the coil bracket 12.

[0072] In this invention, each bracket mounting block 42 is made of an electrode material; for example, the bracket mounting block 42 can be made entirely of beryllium copper electrodes. The bracket mounting block 42 is insulated from the bracket positioning seat 41, and the bracket mounting block 42 is provided with a mounting groove 421 for mounting the coil bracket 12.

[0073] like Figure 7 and Figure 8As shown, corresponding to the structure of the dual-tube measuring tube 11, the bracket positioning seat 41 has two bracket mounting blocks 42. Each bracket mounting block 42 has two mounting grooves 421 to simultaneously position the two coil supports 12 on the upper and lower U-shaped tube bodies 111 of the measuring tube 11. The shape and dimensions of each mounting groove 421 should be adapted to the corresponding outer dimensions of the coil support 12 so that when the coil support 12 is installed in the mounting groove 421, the mounting groove 421 and the coil support 12 can fit tightly together.

[0074] See Figure 7 and Figure 8 In one embodiment, the bracket mounting block 42 and the bracket positioning seat 41 are insulated from each other by means of an insulating block 43 in the coil bracket positioning assembly 40, wherein the insulating block 43 is made of insulating material. The insulating block 43 is disposed between the bracket mounting block 42 and the bracket positioning seat 41, and the bracket mounting block 42 is connected and fixed to the bracket positioning seat 41 through the insulating block 43.

[0075] The bracket positioning seat 41 and the insulating block 43 can be connected and fixed by a pin structure or a screw structure. After they are tightened, the whole assembly is processed. The processing may include: machining two grooves on the insulating block 43 for embedding the two bracket mounting blocks 42. The two grooves are set independently and spaced apart from each other, so that when the two bracket mounting blocks 42 are installed in the two grooves respectively, the two bracket mounting blocks 42 will not have a short circuit due to contact.

[0076] Optionally, the mating gap between the insulating block 43 and the bracket mounting block 42 can be less than 0.03 mm.

[0077] Alternatively, the bracket mounting block 42 can be connected and fixed to the insulating block 43 by means of a pin structure or a screw structure.

[0078] Optionally, pin holes may be provided on the bracket mounting block 42, insulating block 43 and bracket positioning seat 41 respectively, and the bracket mounting block 42, insulating block 43 and bracket positioning seat 41 can be connected and fixed relative to each other using the same pin to ensure the alignment accuracy of the three.

[0079] See Figure 7 and Figure 8 In one embodiment, the bracket mounting block 42 is provided with a connecting portion 422 for electrical connection with a resistance welding machine. Optionally, the connecting portion 422 may be configured as a connecting screw hole formed on the bracket mounting block 42, which can be electrically connected to the resistance welding machine through a conductive screw and a wire.

[0080] See Figure 2In one embodiment, the welding fixture may include multiple connecting seat assemblies 80, each disposed at the edge of the base 20. Optionally, the number of connecting seat assemblies 80 may be three, each used for electrical connection to the bracket mounting blocks 42 of a top bracket positioning assembly 401 and two side bracket positioning assemblies 402, respectively. The resistance welding machine can achieve electrical connection with the bracket mounting blocks 42 through the electrical connection with the connecting seat assemblies 80.

[0081] like Figure 2 As shown, the connector assembly 80 includes connector terminals 81, which can be electrically connected to the bracket mounting block 42 via wires. One connector assembly 80 may have two connector terminals 81, designated as a positive and a negative terminal, respectively. These terminals are electrically connected to two bracket mounting blocks 42 on a bracket positioning base 41. The positive and negative terminals of the resistance welding machine are then connected to the positive and negative connector terminals 81 on the connector assembly 80. By configuring the connector assembly 80 and connector terminals 81, the resistance welding machine can quickly achieve electrical connection with the bracket mounting block 42, thereby improving welding manufacturing efficiency.

[0082] Optionally, such as Figure 2 As shown, the connector assembly 80 also includes a base 82, which is fixedly mounted on the base 20. Two connector terminals 81 can be independently and spaced apart from each other on the base 82.

[0083] like Figure 2 As shown, in one embodiment of the present invention, the manifold support assembly 50 can be configured as an integral support block structure, the support height of which is adapted to the height of the manifold 14. By setting the manifold support assembly 50, the manifold 14 can be effectively supported, ensuring that the flow meter's measuring tube assembly can be smoothly positioned and assembled with the main body.

[0084] See Figure 2 As shown, in one embodiment of the present invention, the welding fixture may include a pressure block assembly 70, which is disposed between two adjacent tubes of the measuring tube 11 and is used to fix the two adjacent tubes of the measuring tube 11.

[0085] Optionally, such as Figure 9As shown, the clamping block assembly 70 may include two clamping blocks 71 that are detachably connected to each other. Each clamping block 71 is provided with two spaced-apart clamping grooves 711. The shape and size of each clamping groove 711 are adapted to the shape and size of the circumferential surface of the measuring tube 11. When the two clamping blocks 71 are fixedly connected relative to each other, the two parallel U-shaped tubes 111 of the measuring tube 11 are clamped and fixed between the two clamping blocks 71, thereby ensuring the relative position of the two U-shaped tubes 111 and preventing deformation.

[0086] In use, the welding fixture of this embodiment can be initially connected to the corresponding positions of the base 20 for each measuring tube positioning component 30, each coil support positioning component 40, and the stop component 60 to complete the assembly of the welding fixture. After the welding fixture is assembled, when placing the measuring tube component (i.e., the workpiece to be welded), the measuring tube positioning component 30 and the coil support positioning component 40 can be moved as needed to place and position the workpiece to be welded. For details, please refer to the welding method below.

[0087] See Figure 10 The mass flow meter welding method according to embodiments of the present invention is implemented using the welding fixture described in any of the above embodiments. The welding method includes the following steps: S10, the measuring tube 11 is positioned and installed using the measuring tube positioning assembly 30. For example, prior to the step of positioning and installing the measuring tube 11 using the measuring tube positioning assembly 30, the method further includes: installing the vibrating plate 13 at a predetermined position on the measuring tube 11.

[0088] For example Figure 2 As shown, after installing the accessory parts (such as the vibrating plate 13) on the measuring tube 11, the measuring tube 11 is lowered from the right side of the welding fixture, and at the same time, the measuring tube 11 is slid to the left. After sliding until the left side of the measuring tube 11 is in contact with the clamping groove 34 of the tube body positioning block 32 of the two measuring tube positioning assemblies 30 located on the left, the corresponding tube body pressure block 33 is installed by screws to initially fix the measuring tube 11.

[0089] It is understood that in some embodiments, it can be ensured that the outer side of the transverse tube segment 113 of the measuring tube 11 is tightly attached to the stop block 61 of the stop assembly 60, and then the tube body pressing block 33 is fastened to the corresponding tube body positioning block 32, so that the positioning accuracy of the measuring tube 11 can reach the predetermined theoretical value.

[0090] In this embodiment, the positioning accuracy of the measuring tube 11 can be ensured by the positioning components 30 of each measuring tube, and the springback deformation of the measuring tube 11 after bending can be avoided.

[0091] S20, the coil bracket 12 is positioned and installed by the coil bracket positioning assembly 40, and the bracket mounting block 42 of the coil bracket positioning assembly 40 is electrically connected to the resistance welding machine to form a current loop between the measuring tube 11, the coil bracket 12, the bracket mounting block 42 and the resistance welding machine, and to complete the welding and fixing of the measuring tube 11 and the coil bracket 12.

[0092] Optionally, before the step of positioning and installing the coil bracket 12 by the coil bracket positioning assembly 40, the method further includes: pre-installing and fixing the coil bracket 12 onto the bracket mounting block 42 of the coil bracket positioning assembly 40.

[0093] In this embodiment, since each coil support positioning assembly 40 is slidably mounted on the base 20, it is convenient to place the workpiece to be welded. After the workpiece to be welded is positioned by each measuring tube positioning assembly 30 and the stop assembly 60, each coil support positioning assembly 40 is moved so that the coil support 12 fits against the measuring tube 11. Then, the positive and negative poles of the resistance welding machine are connected to the positive and negative connection terminals 81 of the corresponding connection base assembly 80, respectively, so that the coil support 12 and the measuring tube 11 at the corresponding positions can be resistance welded. Thus, the welding and fixing of each coil support 12 and the measuring tube 11 can be completed sequentially.

[0094] The resistance welding machine can be a small, portable, energy-storage resistance welding machine with a rated power of 60±10KW. In other embodiments, the resistance welding machine can be selected with different power depending on the structure of the Coriolis flowmeter and the size of the coil support. A quick-change connector can be selected on the electrode cable of the resistance welding machine to achieve rapid connection with the connecting terminal 81.

[0095] It should be noted that before welding, after moving the coil support positioning components 40 to make the coil support 12 fit against the measuring tube 11, it is necessary to check whether the coil support 12 is completely fitted against the measuring tube 11. It is also necessary to check that there are no short circuits at any position. During welding, after the current loop is connected, the operator starts the resistance welding machine from a safe distance. Welding is complete when sparks are generated at the position of the coil support 12. Afterwards, the quick-change connector of the resistance welding machine is used to quickly switch to the connection terminal 81 at the position of another set of coil supports 12, thus allowing for the next welding operation.

[0096] It should be noted that resistance welding machines generate a large current at the moment of spot welding, and operators must operate from a safe distance.

[0097] Optionally, after the measuring tube positioning assembly 30 completes the positioning and installation of the measuring tube 11, the vibrating plate 13 is attached to the measuring tube positioning assembly 30 for positioning. After the measuring tube 11 and the coil bracket 12 are welded and fixed, the vibrating plate 13 is kept attached to the measuring tube positioning assembly 30 and the vibrating plate 13 is welded and fixed to the measuring tube 11.

[0098] See Figure 10 In one embodiment, after the welding and fixing of the measuring tube 11 and the coil bracket 12 are completed, the method further includes: S30, both the measuring tube 11 and the coil bracket 12 are positioned and installed on the welding fixture.

[0099] S40, connect manifold 14 to measuring tube 11, support manifold 14 through manifold support assembly 50, and weld manifold 14 to measuring tube 11 for fixation.

[0100] In this embodiment, after all coil brackets 12 are positioned and welded, the workpiece is not removed immediately. That is, the measuring tube 11 and the coil brackets 12 are kept in position on the welding fixture. Then, the manifold 14 is fitted with the measuring tube assembly. It is worth noting that the manifold 14 has been pre-machined with insertion holes for the measuring tube 11, and the positioning accuracy of the measuring tube assembly using the welding fixture has reached the theoretical value. This makes the insertion and fitting of the manifold 14 and the measuring tube 11 simpler and the positioning more accurate.

[0101] After connecting the manifold 14 to the measuring tube 11, the manifold 14 is supported by the manifold support assembly 50, and then the manifold 14 and the measuring tube 11 are spot-welded together. Optionally, the step of welding the vibrating plate 13 to the measuring tube 11 mentioned above can be performed after the manifold 14 and the measuring tube 11 are spot-welded together.

[0102] There are various methods for spot welding the manifold 14 and the vibrating plate 13, such as laser spot welding or brazing. However, it is important to note that the measuring tube 11 should not be damaged.

[0103] After completing the above operations, that is, after completing the positioning welding of all coil brackets 12, the spot welding and fixing of manifold 14 and measuring tube 11 and the spot welding and fixing of vibrating plate 13 and measuring tube 11, the two tube bodies of measuring tube 11 can be fixed by the pressure block assembly 70 to ensure that the flow meter assembly will not deform during the disassembly process.

[0104] Optionally, the disassembly process of the flowmeter assembly can be roughly as follows: Loosen each bracket positioning seat 41, allowing each coil bracket positioning assembly 40 to slide outward along the corresponding first slide groove 23. Loosen the tube body clamping block 33 on each measuring tube positioning assembly 30. Hold the flowmeter assembly and slowly slide the corresponding tube body positioning seat 31 to the right until all parts of the flowmeter assembly are out of the interference area of ​​the welding fixture. Then, remove the flowmeter assembly upward and place it in the designated area for the next step.

[0105] The above description uses only the illustrated Coriolis flowmeter structure to provide a detailed description of the welding fixtures and welding methods in this design. Those skilled in the art should understand that, in practice, the above welding fixtures and methods are not suitable for all Coriolis flowmeters. Depending on the Coriolis flowmeter's diameter, measuring tube shape, and other factors, design modifications can be made using this method to accommodate new Coriolis flowmeter structures.

[0106] The mass flow meter welding fixture and welding method of this invention reliably and stably positions and installs the measuring tubes on the base using multiple measuring tube positioning components. Multiple coil support positioning components precisely position the coil supports, ensuring the positioning accuracy of each coil support and its balance and symmetry on the measuring tubes. The coil support positioning components include support mounting blocks made of electrode material, facilitating resistance welding of the coil supports and significantly improving welding efficiency and quality. Furthermore, the manifold support components support the manifold, ensuring the fitting accuracy between the manifold and the measuring tubes, thereby improving the overall assembly efficiency and accuracy of the flow meter.

[0107] The mass flow meter welding fixture and welding method of this invention utilize resistance welding to position and weld the coil support. Resistance welding has advantages such as high efficiency and energy saving, fast welding speed, concentrated heat that is not easily deformed, no arc light or smoke, and environmental friendliness and quiet operation. This greatly improves welding efficiency and optimizes welding quality.

[0108] The mass flow meter welding fixture of this invention can help improve the overall accuracy of the flow meter product and increase its production efficiency. Furthermore, during the manufacturing process, the flow meter only needs to be disassembled as a whole after the measuring tube assembly and manifold are assembled, unlike traditional processes which require disassembling the measuring tube assembly and then reassembling it with the manifold. In addition, the overall disassembly operation of the flow meter is simple and less likely to cause secondary damage.

[0109] This welding fixture is highly precise and ingeniously designed. It effectively prevents the springback deformation of the bent measuring tube, improving the positioning accuracy of both the measuring tube and the coil support. The fixture facilitates the overall disassembly of the flowmeter, ensuring that the disassembly process and subsequent steps do not affect the measuring tube assembly, thus guaranteeing the overall positioning and accuracy of the Coriolis flowmeter. After disassembly, the flowmeter can proceed directly to the next process without secondary assembly, avoiding further errors.

[0110] The above embodiments are merely illustrative examples of structures. The structures in each embodiment are not fixed combinations. In the absence of structural conflicts, the structures in multiple embodiments can be arbitrarily combined and used.

[0111] Although the invention has been described with reference to several typical embodiments, it should be understood that the terminology used is illustrative and exemplary, and not restrictive. Since the invention can be embodied in many forms without departing from the spirit or essence of the invention, it should be understood that the above embodiments are not limited to any of the foregoing details, but should be interpreted broadly within the spirit and scope defined by the appended claims. Therefore, all variations and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. A welding fixture for a mass flow meter, characterized in that, include: Base; A measuring tube positioning assembly, wherein there are multiple measuring tube positioning assemblies, and the multiple measuring tube positioning assemblies are respectively arranged on the base corresponding to the position of the measuring tube, and are used to position and support the measuring tube; A coil support positioning assembly, comprising multiple coil support positioning assemblies, each arranged on the base corresponding to the position of the coil support. Each coil support positioning assembly includes a support positioning seat and a support mounting block disposed on the support positioning seat. The support positioning seat is slidably disposed on the base. The support mounting block is made of electrode material and is insulated from the support positioning seat. The support mounting block is provided with a mounting groove for mounting the coil support. A manifold support assembly is arranged on the base corresponding to the position of the manifold and is used to position and support the manifold.

2. The mass flow meter welding fixture according to claim 1, characterized in that, The bracket mounting block is provided with a connecting part, which is used for electrical connection with the resistance welding machine.

3. The mass flow meter welding fixture according to claim 1, characterized in that, The coil support positioning assembly includes an insulating block made of insulating material. The insulating block is disposed between the support mounting block and the support positioning seat, and the support mounting block is connected and fixed to the support positioning seat through the insulating block.

4. The mass flow meter welding fixture according to claim 1, characterized in that, The plurality of coil support positioning assemblies include a top support positioning assembly and two side support positioning assemblies. The top support positioning assembly is used to position one coil support in the middle of the transverse section of the measuring tube, and the two side support positioning assemblies are respectively used to position two coil supports at the top positions of two longitudinal sections of the measuring tube.

5. The mass flow meter welding fixture according to claim 1, characterized in that, The bracket positioning seat has a first flange on its bottom side and a first sliding groove on the base. The bottom end of the bracket positioning seat can extend into the first sliding groove, and the bottom surface of the first flange can abut against the top surface of the base, so that the bracket positioning seat can be supported and connected to the base and can move along the first sliding groove.

6. The mass flow meter welding fixture according to claim 1, characterized in that, The device includes a stop assembly disposed on the base and located outside the transverse section of the measuring tube. The stop assembly has a stop block for abutting against the outside of the transverse section of the measuring tube, and the stop block is made of insulating material.

7. The mass flow meter welding fixture according to any one of claims 1 to 6, characterized in that, The measuring tube positioning assembly includes a tube positioning seat, a tube positioning block, and a tube pressing block. The bottom of the tube positioning seat is connected to the base, the tube positioning block is connected to the top of the tube positioning seat, and the tube pressing block is detachably connected to the tube positioning block. The tube positioning block and the tube pressing block are respectively provided with clamping grooves for clamping the measuring tube on their opposite sides. The tube positioning block and the tube pressing block are made of insulating material.

8. The mass flow meter welding fixture according to claim 7, characterized in that, The bottom side of the tube positioning seat is provided with a second flange; The base is provided with a second sliding groove, the bottom end of the tube positioning seat can extend into the second sliding groove, and the bottom surface of the second flange can abut against the top surface of the base, so that the tube positioning seat can be supported and connected to the base and can move along the second sliding groove. Alternatively, the base may be provided with a first positioning groove, the bottom end of the tube positioning seat may be inserted into the first positioning groove, and the bottom surface of the second flange may abut against the top surface of the base.

9. The mass flow meter welding fixture according to any one of claims 1 to 6, characterized in that, It includes a pressure block assembly, which is disposed between two adjacent tubes of the measuring tube and is used to fix the two adjacent tubes of the measuring tube.

10. The mass flow meter welding fixture according to any one of claims 1 to 6, characterized in that, The system includes multiple connector assemblies, each disposed at the edge of the base. Each connector assembly includes a connector terminal, which is electrically connected to the bracket mounting block.

11. A welding method for a mass flow meter, characterized in that, The welding method, employing the welding fixture according to any one of claims 1-10, comprises the following steps: The measuring tube is positioned and installed using the measuring tube positioning assembly. The coil support is positioned and installed using the coil support positioning assembly. The support mounting block of the coil support positioning assembly is electrically connected to the resistance welding machine to form a current loop between the measuring tube, the coil support, the support mounting block, and the resistance welding machine, thereby completing the welding and fixing of the measuring tube and the coil support.

12. The mass flow meter welding method according to claim 11, characterized in that, After the welding and fixing of the measuring tube and the coil bracket are completed, the process further includes: Both the measuring tube and the coil support are positioned and installed on the welding fixture. Connect the manifold to the measuring tube, support the manifold through the manifold support assembly, and weld the manifold to the measuring tube for fixation.

13. The mass flow meter welding method according to claim 11, characterized in that, Before the step of positioning and installing the measuring tube using the measuring tube positioning assembly, the method further includes: Install the vibrating plate at a predetermined position on the measuring tube; After the measuring tube positioning assembly completes the positioning and installation of the measuring tube, the vibrating pad is attached to the measuring tube positioning assembly for positioning. After the measuring tube and the coil bracket are welded and fixed, the vibrating plate is kept in contact with the measuring tube positioning assembly, and the vibrating plate and the measuring tube are welded and fixed.

14. The mass flow meter welding method according to claim 11, characterized in that, Before the step of positioning and installing the coil bracket using the coil bracket positioning assembly, the method further includes: The coil bracket is pre-installed and fixed on the bracket mounting block of the coil bracket positioning assembly.

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