Positioning tool for coriolis mass flowmeter processing

Abstract

The application belongs to the technical field of positioning tooling and specifically discloses a positioning tooling for machining of a Coriolis mass flowmeter, which comprises a base, an end fixing mechanism for fixing an end of a vibrating tube is arranged on the base, and a distance block is detachably connected to the base; a vertical plate is fixedly connected to the base, a plurality of limiting assemblies for limiting the vibrating tube are symmetrically arranged on the vertical plate, a positioning block is arranged on the vertical plate, a fixing assembly and a mounting seat are arranged on each of the limiting assemblies and the positioning block, the fixing assembly is detachably connected with the vibrating tube, and the mounting seat is detachably connected with the fixing assembly; the positioning tooling has stronger inclusiveness for small deformation of the vibrating tube and is more accurate in positioning in the way of limiting the key position of the vibrating tube, and can be quickly applied to positioning of mounting seats with different shapes and distance pieces at different positions by replacing different movable blocks and distance blocks.

Description

Technical Field

[0001] This invention relates to the field of positioning tooling technology, and in particular to a positioning tooling for machining Coriolis mass flow meters. Background Technology

[0002] The Coriolis mass flow meter is a direct mass flow meter that directly measures mass flow rate and features high accuracy and stability. Its measurement principle utilizes the Coriolis force generated when a particle moves in a linear motion within a rotating system. The Coriolis mass flow meter replaces rotational motion with the resonant vibration of the measuring tube. As the fluid flows through the measuring tube, it generates a Coriolis force. Because the fluid velocity directions are opposite at the inlet and outlet sections of the measuring tube, the resulting Coriolis forces are opposite in direction, causing the measuring tube to twist relative to the central plane. Finally, by reading the time difference Δt between the inlet and outlet sections passing through the central plane, the mass flow rate can be measured.

[0003] The key structural component of a Coriolis mass flow meter sensor is the measuring tube assembly. A good Coriolis mass flow meter's measuring tube assembly should possess symmetry in structure, materials, and weight. The measuring tube assembly includes a vibrating tube, spacers, an excitation unit, a pickup unit, and mounting brackets for the excitation and pickup units. The vibrating tube is typically two identical, parallel curved tubes. There are generally four spacers, arranged symmetrically in pairs near the inlet and outlet of the vibrating tube. The excitation unit consists of an excitation coil and a magnet. The pickup unit consists of two symmetrically arranged signal coils and magnets, mounted on the vibrating tube via the mounting brackets. The fixed points at both ends around which the vibrating tube resonates are the locations of the spacers. The excitation and pickup units are mounted on the vibrating tube via the mounting brackets. Therefore, accurate positioning of the vibrating tube, spacers, and mounting brackets is crucial to ensuring the structural symmetry of the measuring tube assembly.

[0004] The spacer plate and mounting base are first positioned to the designed location on the vibratory tube using tooling, then spot-welded to the vibratory tube, and finally brazed to secure them. Existing positioning tooling for the vibratory tube, spacer plate, and mounting base uses a method where the vibratory tube is placed on top of the positioning plate, and then pressed firmly onto the positioning plate using pressure blocks. The outer contour of the positioning plate matches the shape of the vibratory tube and has positioning grooves for the spacer plate and mounting base. The spacer plate and mounting base are placed into the corresponding positioning grooves and then pressed firmly with pressure blocks to achieve the positioning effect. This positioning method requires very strict fit between the spacer plate, mounting base, and positioning grooves. If the fit is too large, the positioning will be inaccurate; if the fit is too small, the spacer plate and mounting base will be difficult to fit into the positioning grooves, and only a small portion of the spacer plate will fit into the positioning groove, resulting in a small positioning surface and potential tilting of the spacer plate. In addition, the bending process of the vibratory tube is subject to strict requirements. Even slight deformation after bending will cause the vibratory tube to not fit the contour of the positioning plate, resulting in positioning error. Furthermore, due to the limitations of the material itself, the vibratory tube will inevitably undergo small deformation after bending. Therefore, the positioning error caused by the deformation of the vibratory tube is unavoidable in this positioning method. In view of this, the applicant has proposed a positioning fixture for processing Coriolis mass flow meters. Summary of the Invention

[0005] In view of the shortcomings of the prior art described above, the purpose of this invention is to provide a positioning fixture for processing Coriolis mass flow meters, which solves the problem of poor positioning effect when installing the distance measuring plate and the mounting base in the prior art.

[0006] To achieve the above and other related objectives, the present invention provides a positioning fixture for machining a Coriolis mass flow meter, comprising:

[0007] The base is provided with an end fixing mechanism for fixing the end of the vibrating tube, and a spacer block is detachably connected to the base.

[0008] The upright plate is fixedly connected to the base. Multiple limiting components for limiting the vibration tube are symmetrically arranged on the upright plate. The upright plate is provided with a positioning block. Both the limiting components and the positioning block are provided with fixing components and mounting seats. The fixing components are detachably connected to the vibration tube, and the mounting seats are detachably connected to the fixing components.

[0009] Optionally, the limiting component includes a pair of limiting posts fixedly connected to the upright plate, and a limiting channel for limiting the vibration tube is formed between the limiting posts.

[0010] Optionally, the limiting component includes a clamping block and a movable block. The clamping block is snapped into the vibrating tube. The clamping block is provided with connecting bolts that pass through the vibrating tubes and are used to connect the movable block. The movable block is placed on one of the limiting posts. The mounting base is detachably connected to the movable block.

[0011] Optionally, the movable block is provided with a first connecting hole, and the mounting base is provided with a second connecting hole, the second connecting hole being connected to the first connecting hole by a connecting screw.

[0012] Optionally, the spacer block is provided with a support column, the support column is located between the vibrating tubes, the spacer block has a first spacer surface and a second spacer surface, the first spacer surface is used for positioning the first spacer piece, the second spacer surface is used for positioning the second spacer piece, and the spacer block is provided with a support surface for supporting the vibrating tubes.

[0013] Optionally, the base is provided with a positioning platform, the positioning platform having a positioning surface, the positioning surface cooperating with a first positioning surface to position a first positioning piece, and the second positioning surface fitting into the second positioning piece to position a second positioning piece.

[0014] Optionally, the end fixing mechanism includes a first fixing block and a second fixing block, the first fixing block being detachably connected to the base, the second fixing block being detachably connected to the first fixing block, and the vibration tube being disposed between the first fixing block and the second fixing block.

[0015] Optionally, the first fixing block is provided with a first slot corresponding to the vibrating tube, and the second fixing block is provided with a second slot corresponding to the second vibrating tube. The first slot and the second slot cooperate to fix the vibrating tube.

[0016] Optionally, the first fixing block and the second fixing block are connected by fixing screws.

[0017] Optionally, the upright plate is provided with a limiting surface, which is used to limit the vibration tube.

[0018] As described above, the positioning fixture for processing Coriolis mass flow meters proposed in this invention has the following beneficial effects: The invention can limit the position of the vibrating tube through the setting of the fixing mechanism and limiting components, so that the vibrating tube is stably fixed on the positioning fixture. Furthermore, the modular positioning method makes the fixture more adaptable. The setting of the spacer block can achieve precise positioning of different spacer plate heights and mounting base shapes. At the same time, the method of limiting the key positions of the vibrating tube makes the fixture more tolerant of small deformations of the vibrating tube, meaning that small deformations of the vibrating tube do not affect the accurate positioning of the measuring tube assembly, thereby improving the positioning of the mounting base and spacer plate, so as to facilitate their stability when connected to the vibrating tube. Attached Figure Description

[0019] Figure 1 The diagram shown is a structural schematic diagram of an embodiment of the present invention during assembly.

[0020] Figure 2The diagram shown is a structural schematic of an embodiment of the present invention when it is not assembled.

[0021] Figure 3 The image shown is an enlarged view of point A in one embodiment of the present invention;

[0022] Figure 4 The diagram shown is a structural schematic of a limiting component according to an embodiment of the present invention;

[0023] Figure 5 The diagram shown is a schematic representation of the spacing block in one embodiment of the present invention.

[0024] Explanation of reference numerals in the attached figures:

[0025] 1. Base, 2. Upright plate, 3. Spacer block, 301. Support column, 302. First spacer surface, 303. Second spacer surface, 304. Support surface, 4. Limiting surface, 5. Limiting column, 6. Positioning block, 7. Positioning platform, 701. First fixing block, 8. Second fixing block, 9. Clamping block, 10. Movable block, 11. First connecting hole, 1101. Connecting bolt, 12. Connecting nut, 13. Mounting seat, 14. Second connecting hole, 1401. Vibration tube, 15. First spacer plate, 16. Second spacer plate, 17. Detailed Implementation

[0026] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.

[0027] It should be noted that the illustrations provided in this embodiment are only schematic representations of the basic concept of the present invention. Therefore, the drawings only show components relevant to the present invention and are not drawn according to the actual number, shape, and size of components in implementation. In actual implementation, the form, quantity, and proportion of each component can be arbitrarily changed, and the component layout may be more complex. The structures, proportions, sizes, etc., depicted in the accompanying drawings are only for illustrative purposes to aid those skilled in the art and are not intended to limit the implementation conditions of the present invention. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effects and objectives of the present invention, should still fall within the scope of the technical content disclosed in the present invention. Furthermore, the terms such as "upper," "lower," "left," "right," "middle," and "one" used in this specification are only for clarity of description and are not intended to limit the scope of the present invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the present invention.

[0028] like Figures 1-5 As shown, this invention proposes a positioning fixture for machining Coriolis mass flow meters.

[0029] In an exemplary embodiment, the positioning fixture for processing a Coriolis mass flow meter includes: a base 1, an end fixing mechanism for fixing the end of the vibrating tube 15 is provided on the base 1, and a spacer block 3 is detachably connected to the base 1;

[0030] The upright plate 2 is fixedly connected to the base 1. Multiple limiting components for limiting the vibration tube 15 are symmetrically arranged on the upright plate 2. The upright plate 2 is provided with a positioning block 6. Both the limiting components and the positioning block 6 are provided with fixing components and mounting bases 14. The fixing components are detachably connected to the vibration tube 15, and the mounting bases 14 are detachably connected to the fixing components.

[0031] In this embodiment, the fixed mechanism and limiting components can limit the vibration tube 15, so that the vibration tube 15 is stably fixed on the positioning fixture. The modular positioning method makes the fixture more adaptable. The fixed distance block 3 can achieve precise positioning of different fixed distance plate heights and mounting base 14 shapes. At the same time, the method of limiting the key positions of the vibration tube 15 makes the fixture more tolerant of small deformations of the vibration tube 15. That is, small deformations of the vibration tube 15 do not affect the accurate positioning of the measuring tube assembly, thereby improving the positioning of the mounting base 14 and the fixed distance plate, so as to facilitate the stability when they are connected to the vibration tube 15.

[0032] In one exemplary embodiment, the limiting component includes a pair of limiting posts 5 fixedly connected to the upright plate 2, and a limiting channel for limiting the vibration tube 15 is formed between the limiting posts 5.

[0033] In this embodiment, the limiting component consists of two limiting posts 5, and a limiting channel is formed between the limiting posts 5. The limiting channel can limit the vibration tube 15 and provide a certain supporting force to the vibration tube 15, thereby improving the stability of the vibration tube 15 on the positioning fixture.

[0034] For example, in this embodiment, the straight line formed between the two limiting posts 5 in the limiting component has a certain angle with the horizontal direction. The angle of inclination is the same as the angle of inclination of the vibrating tube 15 in the limiting channel, so as to avoid the limiting posts 5 squeezing the vibrating tube 15 and causing the vibrating tube 15 to be stressed and worn.

[0035] In this embodiment, the limiting post 5 is fixedly connected to the upright plate 2, which can be achieved by welding.

[0036] In an exemplary embodiment, the limiting component includes a clamping block 10 and a movable block 11. The clamping block 10 is snapped into the vibrating tube 15. The clamping block 10 is provided with connecting bolts 12 that pass through the vibrating tubes 15 and are used to connect the movable block 11. The movable block 11 is placed on one of the limiting posts 5. The mounting base 14 is detachably connected to the movable block 11.

[0037] In this embodiment, the clamping block 10 and the movable block 11 are used to fix the limiting component to the vibrating tube 15, thereby fixing the mounting base 14 to the movable block 11. In this embodiment, the clamping block 10 and the movable block 11 are located on both sides of the vibrating tube 15, and are fixed by the connecting bolts 12 and the connecting nuts 13, so that the limiting component can be firmly connected to the vibrating tube 15. Then, the mounting base 14 is used to install the vibration pickup unit and the excitation unit. In this embodiment, the fixed component on the limiting component is used to install the vibration pickup unit, and the fixed component on the positioning block 6 is used to install the excitation unit.

[0038] For example, in this embodiment, the movable block 11 is provided with a first connecting hole 1101, which is a threaded hole, and the mounting base 14 is provided with a second connecting hole 1401. The second connecting hole 1401 is connected to the first connecting hole 1101 by a connecting screw. The first connecting hole 1101 and the second connecting hole 1401 are connected by the connecting screw to achieve the function of fixing the mounting base 14 on the movable block 11.

[0039] For example, in this embodiment, the mounting base 14 is connected to both ends of the movable block 11. The clamping block 10 is provided with an arc-shaped groove corresponding to the vibration tube 15, and the mounting base 14 is also provided with an arc-shaped groove. After the clamping block 10 and the movable block 11 are fixed by the connecting bolts 12, the clamping block 10 and the arc-shaped groove on the mounting base 14 form a clamp-like structure, which clamps the vibration tube 15 and realizes the installation of the fixing component. During installation, the side of the movable block 11 can be placed on the upper surface of the lower limiting post 5 in the limiting component to achieve the initial positioning of the fixing component.

[0040] In an exemplary embodiment, the spacer block 3 is provided with a support column 301, which is located between the vibrating tubes 15. The spacer block 3 has a first spacer surface 302 and a second spacer surface 303. The first spacer surface 302 is used for positioning the first spacer piece 16, and the second spacer surface 303 is used for positioning the second spacer piece 17. The spacer block 3 is provided with a support surface 304 for supporting the vibrating tubes 15.

[0041] In this embodiment, the fixed distance block 3 can accurately position the two fixed distance plates on the vibrating tube 15. The support column 301 on the fixed distance block 3 is used to expand the area of ​​the first fixed distance surface 302 and the second fixed distance surface 303, thereby improving the positioning effect of the first fixed distance plate 16 and the second fixed distance plate 17.

[0042] For example, the base 1 is provided with a positioning platform 7, the positioning platform 7 has a positioning surface 701, the positioning surface 701 cooperates with the first positioning surface 302 to position the first positioning piece 16, and the second positioning surface 303 is attached to the second positioning piece 17 to position the second positioning piece 17.

[0043] For example, in this embodiment, the support column 301 is integrally formed on the spacer block 3. During installation, the support column 301 is inserted into the gap between the two vibrating tubes 15 to achieve the positioning of the spacer block 3. In this embodiment, a positioning pin can also be set between the base 1 and the spacer block 3 to achieve the installation of the spacer block 3. After the spacer block 3 is installed, a gap of fixed width is formed between the first spacer surface 302 and the positioning surface 701 to firmly fix the first spacer piece 16 between the spacer block 3 and the positioning platform 7. At the same time, the second spacer piece 17 can be placed on the second spacer surface 303 to fix the first spacer piece 16 and the second spacer piece 17 on the vibrating tube 15.

[0044] It is worth noting that, for spacers with different positional requirements, different spacer blocks 3 can be customized to achieve the positioning of the spacers on the vibrating tube 15.

[0045] In an exemplary embodiment, the end fixing mechanism includes a first fixing block 8 and a second fixing block 9. The first fixing block 8 is detachably connected to the base 1 and can be installed on the base 1 with screws. The installation position is located outside the positioning platform 7 to facilitate fixing the end of the vibrating tube 15. The second fixing block 9 is detachably connected to the first fixing block 8, specifically by fixing screws. The vibrating tube 15 is disposed between the first fixing block 8 and the second fixing block 9. The first fixing block 8 is provided with a first slot corresponding to the vibrating tube 15, and the second fixing block 9 is provided with a second slot corresponding to the second vibrating tube 15. The first slot and the second slot cooperate to form a clamp-like structure to fix the vibrating tube 15.

[0046] In an exemplary embodiment, the upright plate 2 is provided with a limiting surface 4, which is used to limit the vibration tube 15.

[0047] In this embodiment, the limiting surface 4 can limit the vibration tube 15. When installing the vibration tube 15, after the end of the vibration tube 15 is fixed by the end fixing mechanism, the vibration tube 15 close to the vertical plate 2 is installed in close contact with the limiting surface 4 to ensure the accurate positioning of the vibration tube 15.

[0048] Specific implementation steps: First, install the vibrating tube 15. Insert both ends of the vibrating tube 15 into the first slots of the first fixing blocks 8 on both sides, ensuring the inner side of the vibrating tube 15 is flush against the limiting surface 4. Insert the spacer plate into the vibrating tube 15, and then install the second fixing block 9 onto the first fixing block 8. The second fixing block 9 connects to the first fixing block 8 to fix both ends of the vibrating tube 15. Simultaneously, allow the vibrating tube 15 to pass through the limiting channel formed by the limiting post 5, achieving installation of the vibrating tube 15 through multi-point limiting. Second, install the mounting base 14 at both ends of the movable block 11, ensuring the side of the movable block 11 is flush with the upper surface of the limiting post 5, and the side of the top movable block 11 is flush with the surface of the positioning block 6. The clamping block 10 and the movable block 11 are connected by the connecting bolt 12 passing through the gap between the vibrating tubes 15, and then tightened by the connecting nut 13. At this time, the clamping block 10 and the mounting base 14 form a clamp-like structure to hold the vibrating tube 15 in place. After the mounting base 14 is welded to the vibrating tube 15, the excitation unit or the vibration pickup unit can be installed on the mounting base 14. In the third step, the spacer block 3 is installed so that the support column 301 is located in the gap between the vibrating tubes 15. The spacer block 3 holds the first spacer piece 16 in place by the first spacer surface 302 and the positioning surface 701. The second spacer piece 17 is placed on the second spacer surface 303 to achieve the positioning of the spacer piece. The first spacer piece 16 and the second spacer piece 17 are then welded to the vibrating tube 15.

[0049] In summary, the present invention, through the end fixing mechanism and limiting component, can install and position the vibrating tube 15 to facilitate the fixing of the mounting base 14, thereby enabling the installation of the excitation unit and the vibration pickup unit. Furthermore, the setting of the spacer block 3 accurately positions the two spacer plates, facilitating their installation. By limiting the key positions of the vibrating tube 15, the tooling becomes more tolerant of small deformations of the vibrating tube 15.

[0050] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A positioning fixture for machining a Coriolis mass flow meter, characterized in that, include: The base is provided with an end fixing mechanism for fixing the end of the vibrating tube. A spacer block is detachably connected to the base. A support column is provided on the spacer block. The support column is located between the vibrating tubes. The spacer block has a first spacer surface and a second spacer surface. The first spacer surface is used for positioning the first spacer piece, and the second spacer surface is used for positioning the second spacer piece. The upright plate is fixedly connected to the base. The upright plate is provided with a limiting surface for limiting the vibration tube. The upright plate is symmetrically provided with a plurality of limiting components for limiting the vibration tube. Each limiting component includes a pair of limiting posts fixedly connected to the upright plate, and a limiting channel for limiting the vibration tube is formed between the limiting posts. The positioning fixture further includes a fixing component and a mounting base; wherein, the fixing component includes a clamping block and a movable block, the clamping block is snapped into the vibrating tube, the clamping block is provided with connecting bolts that pass through the vibrating tubes and are used to connect the movable block, the movable block is placed on one of the limiting posts, and the mounting base is detachably connected to the movable block.

2. The positioning fixture for machining a Coriolis mass flow meter according to claim 1, characterized in that: The movable block is provided with a first connecting hole, and the mounting base is provided with a second connecting hole. The second connecting hole is connected to the first connecting hole by a connecting screw.

3. The positioning fixture for machining a Coriolis mass flow meter according to claim 1, characterized in that: The spacer block is provided with a support surface for supporting the vibrating tube.

4. The positioning fixture for machining a Coriolis mass flow meter according to claim 3, characterized in that: The base is provided with a positioning platform, which has a positioning surface. The positioning surface cooperates with the first positioning surface to position the first positioning piece, and the second positioning surface is attached to the second positioning piece to position the second positioning piece.

5. The positioning fixture for machining a Coriolis mass flow meter according to claim 1, characterized in that: The end fixing mechanism includes a first fixing block and a second fixing block. The first fixing block is detachably connected to the base, and the second fixing block is detachably connected to the first fixing block. The vibration tube is disposed between the first fixing block and the second fixing block.

6. The positioning fixture for machining a Coriolis mass flow meter according to claim 5, characterized in that: The first fixing block is provided with a first slot corresponding to the vibrating tube, and the second fixing block is provided with a second slot corresponding to the second vibrating tube. The first slot and the second slot cooperate to fix the vibrating tube.

7. The positioning fixture for machining a Coriolis mass flow meter according to claim 6, characterized in that: The first fixing block and the second fixing block are connected by fixing screws.

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