Welding fixture and welding system

Abstract

The utility model relates to a kind of welding tool and welding system, belong to flowmeter welding equipment technical field.Welding tool includes bottom plate, manifold clamping mechanism, measuring tube clamping mechanism, pressing mechanism and welding mechanism;Manifold clamping mechanism can be positioned to manifold main body clamping;Measuring tube clamping mechanism can be clamped fixed to measuring tube;Pressing mechanism can be with the top of measuring tube abut, so that measuring tube and manifold main body closely adhere.Welding mechanism includes tube welding gun and tray;Tube welding gun is equipped with the welding port that is matched with the shape of measuring tube;Tube welding gun can be moved along tray, to make the welding port of tube welding gun cover in the junction of manifold main body and measuring tube, to carry out welding fixation to it, to effectively improve weld forming quality and welding strength, and then reduce the uncertainty brought by artificial spot welding operation, improve the machining precision and reliability of product.

Description

Technical Field

[0001] This utility model relates to the technical field of flow meter welding equipment, and in particular to a welding fixture and welding system. Background Technology

[0002] A Coriolis mass flow meter (or Coriolis flow meter for short) is an instrument that measures mass flow rate by utilizing the Coriolis force generated by fluid in a vibrating pipeline. It is widely used in petrochemical, energy, and chemical industries. The flow meter mainly consists of a measuring tube, a manifold body, and a drive and detection assembly. The connection quality between the measuring tube and the manifold body directly affects the reliability and measurement accuracy of the instrument.

[0003] The existing connection process between the measuring tube and the manifold body involves positioning them with a fixture and then connecting them using spot welding techniques such as brazing or argon arc welding. The entire process relies heavily on manual positioning and welding, which results in low welding efficiency and makes it difficult to guarantee welding consistency, strength, and accuracy. This significantly limits the production speed and yield rate of Coriolis flowmeters. Utility Model Content

[0004] The purpose of this invention is to solve the technical problems of low welding rate and poor welding accuracy in Coriolis flow meters.

[0005] To address the aforementioned technical problems, this application provides a welding fixture for welding the manifold body and measuring tube of a Coriolis flowmeter. The welding fixture includes: a base plate; a manifold clamping mechanism disposed on the base plate; the manifold clamping mechanism includes two opposing clamping ends, spaced apart to form a manifold body mounting position; the two clamping ends are movable relative to each other along a first direction to clamp and position the manifold body; a measuring tube clamping mechanism disposed on the base plate for clamping and fixing the measuring tube; and a pressing mechanism disposed on the measuring tube. The measuring tube clamping mechanism can abut against the top of the measuring tube and press the measuring tube from top to bottom, so that the measuring tube is tightly fitted to the manifold body; the welding mechanism includes a tube welding gun and a tray; the tray is set on the base plate and located above the clamping end; the tube welding gun is set on the tray and has a welding port that matches the shape of the measuring tube; the tube welding gun can move along the tray so that the welding port of the tube welding gun covers the junction of the manifold body and the measuring tube for welding and fixing.

[0006] In some examples of this application, the manifold clamping mechanism includes a drive assembly and two abutment portions, the two abutment portions being spaced apart to form a manifold body mounting position; the opposite ends of the two abutment portions are the clamping ends; both abutment portions are slidably connected to the base plate and are capable of sliding relative to each other in a first direction; the drive assembly is connected to the abutment portions and is capable of driving the abutment portions to move relative to each other in the first direction.

[0007] In some examples of this application, the drive assembly includes a clamping handle, a first link, and a second link; the base plate is provided with a moving groove extending in a second direction; the clamping handle is slidably disposed in the moving groove; one end of the first link and the second link is rotatably connected to the clamping handle, and the other end of the first link and the second link are respectively rotatably connected to the two abutment portions; when the clamping handle moves along the moving groove, it can drive the abutment portions on the other ends of the first link and the second link to move closer to or further away from each other.

[0008] In some examples of this application, the abutment portion includes a first driving member and a slider; the slider is slidably connected to the base plate, the first driving member is disposed on the slider and correspondingly connected to the clamping end; the first driving member can drive the clamping ends to move closer or further apart along a first direction to achieve automatic clamping or release of the manifold body.

[0009] In some examples of this application, the measuring tube clamping mechanism includes a first support frame and two clamping arm assemblies; the first support frame is fixed on the base plate; the clamping arm assemblies are disposed on the first support frame and correspond to the measuring tube, so that the two clamping arm assemblies can clamp and fix the two sides of the measuring tube respectively.

[0010] In some examples of this application, the clamping arm assembly includes a movable arm, a rotating arm, and a second driving member; the movable arm and the rotating arm are arranged opposite to each other, and the opposite sides of the movable arm and the rotating arm are provided with receiving notches that match the shape of the measuring tube; the second driving member is disposed on the first support frame and connected to the movable arm; the second driving member can drive the movable arm to reciprocate along a first direction; the rotating arm is rotatably connected to the first support frame, and a gripping rod is provided on the end of the rotating arm away from the first support frame, the gripping rod being used to drive the rotating arm to rotate.

[0011] In some examples of this application, the clamping mechanism includes a second support frame, a third driving member, a driving rod, and a clamping block; the second support frame is fixed on a first support frame, the third driving member is disposed on the top of the second support frame, one end of the driving rod is connected to the third driving member, and the other end of the driving rod is connected to the clamping block; the third driving member can drive the driving rod and the clamping block thereon to move up and down.

[0012] In some examples of this application, the second support frame is provided with a guide rail that extends vertically; the clamping block is disposed on the guide rail and can slide up and down along the guide rail; the bottom surface of the clamping block opposite to the drive rod is provided with an arc-shaped groove, the shape of which is adapted to the top shape of the measuring tube.

[0013] In some examples of this application, a limiting groove is provided on the tray, and the pipe welding gun can move along the side wall of the limiting groove so that the welding port of the pipe welding gun is aligned with the junction of the manifold body and the measuring tube; a sensor is provided in the limiting groove of the tray, and the sensor is used to identify the position of the pipe welding gun in order to determine whether the pipe welding gun is in the welding working position.

[0014] This application also provides a welding system, comprising: a welding fixture as described above; a worktable, the base plate of which is disposed on the upper surface of the worktable; a welding system and a pneumatic system integrated within the worktable; the pneumatic system being connected to the manifold clamping mechanism, the measuring tube clamping mechanism, and the pressing mechanism to drive them to automatically clamp the Coriolis flowmeter; the welding system being connected to the pipe welding gun to drive the pipe welding gun to automatically weld; and a controller connected to the worktable for controlling the operating parameters of the welding system and the pneumatic system.

[0015] As can be seen from the above technical solution, the beneficial effects of this utility model are as follows: This application provides a welding fixture and welding system. The welding fixture has a base plate equipped with a manifold clamping mechanism, a measuring tube clamping mechanism, and a clamping mechanism. These mechanisms enable rapid and accurate positioning and fixing of the manifold body and the measuring tube before welding, ensuring stable relative positions during the welding process and avoiding deviations caused by manual adjustments. The clamping mechanism applies pressure to the measuring tube from top to bottom, ensuring a tight fit between the measuring tube and the manifold body, effectively reducing welding gaps and deformation. The welding mechanism uses a pipe welding torch with a welding port that matches the shape of the measuring tube. It can stably move to the welding position and complete the pipe welding in one pass. This not only improves weld formation quality and strength but also enhances welding efficiency and consistency, significantly reducing the uncertainties associated with manual spot welding and ensuring the overall processing accuracy and reliability of the product. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of a welding system.

[0017] Figure 2 This is a three-dimensional structural diagram of the welding fixture.

[0018] Figure 3 for Figure 2 A three-dimensional structural diagram of the welding fixture without the Coriolis flow meter installed.

[0019] Figure 4 for Figure 3 A three-dimensional structural diagram of the welding fixture from another angle.

[0020] Figure 5 for Figure 4 A three-dimensional structural diagram of the clamping block of the welding fixture.

[0021] Figure 6 for Figure 2 A three-dimensional structural diagram of the welding mechanism and manifold body clamping mechanism of the welding fixture.

[0022] Figure 7 for Figure 6 A schematic diagram of the manifold main clamping mechanism and the flow meter clamping structure.

[0023] Figure 8 for Figure 7 A three-dimensional structural diagram of the manifold main clamping mechanism.

[0024] Figure 9 This is a three-dimensional structural diagram of a pipe welding torch.

[0025] Figure 10 This is a three-dimensional structural diagram of a Coriolis flow meter.

[0026] Figure 11 This is a schematic diagram of the connection structure between the Coriolis flow meter and the prepositioning fixture.

[0027] Figure 12 for Figure 11 A schematic diagram of the pre-positioning fixture.

[0028] The annotations in the attached figures are explained as follows: 100. Welding fixture; 110. Base plate; 111. Moving groove; 120. Manifold clamping mechanism; 121. Drive assembly; 1211. Clamping handle; 1212. First connecting rod; 1213. Second connecting rod; 1214. Compression spring; 122. Abutment part; 1221. Slider; 1222. First drive component; 1223. Clamping end; 130. Measuring tube clamping mechanism; 131. First support frame; 132. Clamping arm assembly; 1321. Moving arm; 1322. Rotating arm; 13221. Grip rod; 140. Pressing mechanism; 141. Second support frame; 142. Third drive component; 143. Drive rod; 144. Clamping block; 1441. Arc groove; 145. Guide rail; 146. Limiting protrusion; 150. Welding mechanism; 151. Tray; 1511. Limiting groove; 1512. Sensor; 152. Pipe welding gun; 1521. Gun body; 1522. Welding port; 1523. Baffle; 200. Workbench; 210. Pneumatic control switch; 300. Controller; 400. Coriolis flow meter; 410. Manifold body; 411. Manifold connector; 420. Measuring tube; 500. Pre-positioning fixture; 510. Arc top plate; 520. Pull rod; 530. Positioning pin. Detailed Implementation

[0029] Typical embodiments embodying the features and advantages of this utility model will be described in detail in the following description. It should be understood that this utility model can have various variations in different embodiments, all of which do not depart from the scope of this utility model, and the descriptions and illustrations therein are for illustrative purposes only and not intended to limit this utility model.

[0030] 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 mechanism 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.

[0031] 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.

[0032] Please see Figure 1This embodiment provides a welding system for welding the manifold body 410 and measuring tube 420 of a Coriolis flowmeter 400. The welding system includes a welding fixture 100, a worktable 200, and a controller 300. The worktable 200 integrates the welding system and the pneumatic system; the controller 300 is connected to the worktable 200 and is used to control the operating parameters of the welding system and the pneumatic system.

[0033] Specifically, the welding fixture 100 is fixedly installed on the upper surface of the workbench 200, which integrates a welding system and a pneumatic system. The welding system may include a pipe welding machine, a current device, a protective device, and accessory pipelines, etc., which can provide stable electrical energy to the welding fixture 100 and continuously deliver welding wire and protective gas to the welding area during the welding process to prevent weld oxidation or slag inclusion.

[0034] The pneumatic system within the workbench 200 is connected to the pneumatic clamping mechanism on the welding fixture 100, enabling the reciprocating motion of each clamping mechanism to achieve rapid positioning, automatic clamping, and release of the manifold body 410 and the measuring tube 420, thereby reducing errors caused by manual operation. A pneumatic control switch 210 can also be installed on the workbench 200, allowing the user to manually drive the reciprocating motion of each clamping mechanism, thus enabling the welding fixture 100 to handle various working conditions.

[0035] The controller 300 is electrically connected to the workbench 200 and is used for automatic control of the welding and pneumatic systems. The controller 300 can preset welding parameters, including welding current, welding speed, shielding gas flow rate, and gas supply time. The controller 300 programmatically controls the sequence of actions of the clamping mechanism, enabling the entire welding process to be completed automatically according to predetermined logic. The operator only needs to place the Coriolis flowmeter 400 in the appropriate mounting position and activate the controller 300 to sequentially clamp the manifold body 410 and the measuring tube 420, thereby completing the welding and fixing of the interface.

[0036] Please see Figures 2 to 12 In this embodiment, the welding fixture 100 includes a base plate 110, a manifold clamping mechanism 120, a measuring tube clamping mechanism 130, a clamping mechanism 140, and a welding mechanism 150.

[0037] A manifold clamping mechanism 120 is mounted on the base plate 110. The manifold clamping mechanism 120 includes two opposing clamping ends 1223, with a gap between the two clamping ends 1223 forming a mounting position for the manifold body 410. The two clamping ends 1223 can move relative to each other in a first direction to clamp and position the manifold body 410. A measuring tube clamping mechanism 130 is mounted on the base plate 110 for clamping and fixing the measuring tube 420. A pressing mechanism 140 is mounted on the measuring tube clamping mechanism 130. The pressing mechanism 140 can abut against the top of the measuring tube 420 and can press the measuring tube 420 from top to bottom, making it fit tightly against the manifold body 410.

[0038] The welding mechanism 150 includes a pipe welding torch 152 and a tray 151. The tray 151 is disposed on the base plate 110 and located above the clamping end 1223. The pipe welding torch 152 is disposed on the tray 151 and has a welding port 1522 that matches the shape of the measuring tube 420. The pipe welding torch 152 can move along the tray 151 so that the welding port 1522 of the pipe welding torch 152 covers the junction of the manifold body 410 and the measuring tube 420 for welding and fixing.

[0039] Specifically, such as Figure 10 As shown, the Coriolis flow meter 400 may include a manifold body 410 and two bent measuring tubes 420. The manifold body 410 has openings at both ends, and a manifold connection interface 411 is located on its top surface. Fluid channels inside the manifold body 410 connect the openings to the manifold connection interface 411. The measuring tubes 420 have a U-shaped structure, with both ends connected to the manifold connection interface 411 of the manifold body 410. Fluid is distributed to the two measuring tubes 420 through one opening of the manifold body 410, and then merges and flows out through the other opening of the manifold body 410. During this process, the fluid inside the measuring tubes 420 generates a phase difference due to vibration, thereby calculating the fluid flow rate. like Figures 2 to 4 As shown, the welding fixture 100 enables rapid positioning and welding of the manifold body 410 and the measuring tube 420. The manifold clamping mechanism 120 securely holds the manifold body 410 within its mounting position via two clamping ends 1223 that can move horizontally in a first direction, preventing it from shifting during welding. The measuring tube clamping mechanism 130 is used to laterally position the U-shaped measuring tube 420, ensuring that the measuring tube 420 is aligned with the manifold interface 411 of the manifold body 410. A pressing mechanism 140 positioned above the measuring tube clamping mechanism 130 presses the top of the measuring tube 420 from top to bottom, ensuring a tight fit between the measuring tube 420 and the manifold body 410, thus guaranteeing the stability of the weld.

[0040] like Figure 6 and Figure 9As shown, the welding mechanism 150 has a welding port 1522 on its pipe welding gun 152 that matches the shape of the measuring tube 420. The pipe welding gun 152 can move along a predetermined trajectory to the junction of the measuring tube 420 and the manifold body 410 to achieve circumferential welding of the interface.

[0041] The pipe welding gun 152 is an automated welding tool specifically designed for pipe welding. The pipe welding gun 152 may include a gun body 1521, a welding port 1522, and a baffle 1523. The welding port 1522 is located on one side of the gun body 1521 and matches the shape of the outer wall of the measuring tube 420. The welding port 1522 may have an annular structure, allowing it to conform to the curved outer diameter surface of the measuring tube 420. The covering contact of the welding port 1522 with the measuring tube 420 improves the uniformity of stress during welding and the continuity of weld formation, resulting in a fuller, more aesthetically pleasing weld with good strength and airtightness. The baffle 1523 on the gun body 1521 can rotate around its axis to cover the measuring tube 420 within the welding port 1522, achieving 360° full-coverage welding.

[0042] Through the aforementioned structure, the welding fixture 100 can quickly clamp and position the manifold body 410 and the measuring tube 420, avoiding repeated manual adjustments and improving welding accuracy. The clamping mechanism 140 of the welding fixture 100 ensures the tightness of the mating surfaces, reducing weld gaps and thus improving welding strength and sealing effect. Simultaneously, with the automatic adaptation of the pipe welding torch 152 and the welding port 1522, pipe welding can be completed quickly. This effectively shortens welding time, improves production efficiency, reduces reliance on manual labor, and helps improve welding consistency and product qualification rate.

[0043] Please see Figure 6 In some embodiments, a limiting groove 1511 is provided on the supporting surface of the tray 151, and the pipe welding gun 152 can move along the side wall of the limiting groove 1511 so that its welding port 1522 is aligned with or away from the junction of the manifold body 410 and the measuring tube 420.

[0044] Specifically, the tray 151 is fixedly mounted above the manifold clamping mechanism 120, and its upper surface is provided with a support surface for stable support of the pipe welding torch 152. To limit the movement path of the pipe welding torch 152, the tray 151 is provided with a limiting groove 1511 extending along the first direction. The two side walls of the limiting groove 1511 form guide edges to limit and guide the pipe welding torch 152, so that it can move smoothly within the specified path.

[0045] During the welding process, the pipe welding torch 152 slides along the guide edge of the limiting groove 1511 under the operator's control, and its welding port 1522 gradually aligns with the joint between the manifold body 410 and the measuring tube 420. Once the welding port 1522 is fully aligned with the interface position, the baffle 1523 is closed and the welding system is started to complete the automatic welding. After welding, the baffle 1523 is opened, and the pipe welding torch 152 can slide in the opposite direction along the limiting groove 1511, quickly moving away from the welding area to avoid secondary interference with the weld and ensure welding quality.

[0046] Please see Figure 6 In some embodiments, a sensor 1512 is also provided on the tray 151 to detect whether the pipe welding torch 152 has moved to the predetermined working position. When the pipe welding torch 152 reaches the working position, the sensor 1512 transmits the sensing signal to the controller 300, and the controller 300 issues a command to control the pipe welding torch 152 to start automatic welding, thereby ensuring that the welding operation is performed in the accurate position and improving the accuracy and reliability of welding.

[0047] Please see Figure 7 and Figure 8 In some embodiments, the manifold clamping mechanism 120 includes a drive assembly 121 and two abutment portions 122. The two abutment portions 122 are spaced apart to form a mounting position for the manifold body 410; the opposite ends of the two abutment portions 122 are clamping ends 1223. Both abutment portions 122 are slidably connected to the base plate 110 and are capable of sliding relative to each other in a first direction; the drive assembly 121 is connected to the abutment portions 122 and is capable of driving the abutment portions 122 to move relative to each other in the first direction.

[0048] The clamping end 1223 of the abutment portion 122 is a columnar structure, the shape of which is adapted to the openings at both ends of the manifold body 410, enabling accurate positioning of the manifold body 410 during clamping. The drive assembly 121 can drive the two abutment portions 122 to move closer to each other along a first direction to abut the openings at both ends of the manifold body 410. When the drive assembly 121 drives the two abutment portions 122 to move away from each other along the first direction, the clamping of the manifold body 410 can be released.

[0049] Please see Figure 8 In some embodiments, the drive assembly 121 includes a clamping handle 1211, a first link 1212, and a second link 1213.

[0050] The base plate 110 is provided with a movable groove 111 extending along a second direction, which is perpendicular to the first direction. A clamping handle 1211 is slidably disposed within the movable groove 111. One end of the first connecting rod 1212 and the second connecting rod 1213 is rotatably connected to the clamping handle 1211, and the other ends of the first connecting rod 1212 and the second connecting rod 1213 are respectively rotatably connected to two abutment portions 122. When the clamping handle 1211 moves along the movable groove 111, it can cause the abutment portions 122 on the other ends of the first connecting rod 1212 and the second connecting rod 1213 to move closer together or further apart.

[0051] Specifically, the first link 1212 and the second link 1213 are similar in shape to an "L" shape, with a rotating shaft at the corner to allow rotation around the shaft. To avoid restricting the degrees of freedom of the first link 1212 and the second link 1213, oblong holes are provided on the first and second ends of the first link 1212 and the second link 1213, respectively. The clamping handle 1211 passes through the oblong holes at the first ends of the first link 1212 and the second link 1213 to form a sliding-rotational composite connection.

[0052] When the clamping handle 1211 moves along the moving groove 111, that is, when the clamping handle 1211 moves inward toward the base plate 110 in the second direction, it can drive the first connecting rod 1212 and the second connecting rod 1213 to rotate around the rotating axis; the second ends of the first connecting rod 1212 and the second connecting rod 1213 open away from each other, and further drive the two abutting parts 122 to open away from each other, thereby releasing the clamping of the manifold body 410. When the clamping handle 1211 moves outward in the second direction, the first connecting rod 1212 and the second connecting rod 1213 rotate in the opposite direction, and their second ends move closer to each other, driving the abutting parts 122 to move closer to each other, realizing the pre-clamping and positioning of the manifold body 410.

[0053] like Figure 7 As shown, in some embodiments, the clamping handle 1211 is provided with a compression spring 1214, which can provide an outward elastic force when released, so that the abutment portion 122 can generate a continuous clamping force when pre-pressed.

[0054] In some embodiments, a positioning hole may also be provided at the end of the moving slot 111. When the clamping handle 1211 moves above the positioning hole, the clamping handle 1211 can be pressed down. This causes the clamping handle 1211 to be inserted into the positioning hole, thereby achieving complete locking of the drive assembly 121 and preventing the manifold body 410 from loosening during the pre-positioning process.

[0055] Please see Figure 8In some embodiments, the abutment portion 122 includes a first driving member 1222 and a slider 1221. The slider 1221 is slidably connected to the base plate 110, and the first driving member 1222 is disposed on the slider 1221 and correspondingly connected to the clamping end 1223. The first driving member 1222 can drive the clamping ends 1223 to move closer or further apart along a first direction to achieve automatic clamping or release of the manifold body 410.

[0056] Specifically, the abutment part 122 may consist of two parts: a slider 1221 slidably connected to the slide rail of the base plate 110, and a first drive member 1222 mounted on the slider 1221 and connected to the clamping end 1223. The first drive member 1222 may be a pneumatic device, which can be connected to the pneumatic system in the worktable 200, and drives the reciprocating motion of the clamping end 1223 connected to it by controlling the input and release of air pressure.

[0057] When the first driving member 1222 moves the clamping ends 1223 closer together, the manifold body 410 is automatically clamped. When the first driving member 1222 reverses its movement, causing the clamping ends 1223 to move away from each other, the manifold body 410 is automatically released. The automated clamping and releasing mechanism achieved by the first driving member 1222 not only improves operational efficiency but also avoids positioning deviations caused by manual clamping, ensuring the stability and coaxiality of the manifold body 410 during the welding process.

[0058] Please see Figure 3 In some embodiments, the measuring tube clamping mechanism 130 includes a first support frame 131 and two clamping arm assemblies 132. The first support frame 131 is fixed on the base plate 110; the clamping arm assemblies 132 are disposed on the first support frame 131 and correspond to the measuring tube 420, so that the two clamping arm assemblies 132 clamp and fix the two sides of the measuring tube 420 respectively.

[0059] Specifically, the first support frame 131 is mounted on the base plate 110 by bolts or welding, providing a reliable mounting foundation for the entire clamping mechanism. Two clamping arm assemblies 132 are symmetrically arranged on the platform of the first support frame 131, their positions corresponding to the two sides of the measuring tube 420. Each clamping arm assembly 132 generates clamping force during operation, thereby firmly fixing the measuring tube 420 in the preset position of the tooling. Through the symmetrical clamping design of the clamping arm assemblies 132, the measuring tube 420 is effectively constrained laterally, preventing displacement caused by vibration during welding, thus ensuring the docking accuracy between the measuring tube 420 and the manifold body 410.

[0060] Please see Figure 3 and Figure 4 In some embodiments, each clamping arm assembly 132 includes a movable arm 1321, a rotating arm 1322, and a second drive member.

[0061] The movable arm 1321 and the rotating arm 1322 are arranged opposite to each other, and the opposite sides of the movable arm 1321 and the rotating arm 1322 are provided with receiving notches that match the shape of the measuring tube 420. The second driving member is disposed on the first support frame 131 and connected to the movable arm 1321. The second driving member can drive the movable arm 1321 to reciprocate along the first direction; the rotating arm 1322 is rotatably connected to the first support frame 131, and a gripping rod 13221 is provided on the end of the rotating arm 1322 away from the first support frame 131. The gripping rod 13221 is used to drive the rotating arm 1322 to rotate.

[0062] Specifically, each clamping arm assembly 132 consists of a movable arm 1321, a rotating arm 1322, and a second driving member. These three components work together to stably clamp the measuring tube 420. The movable arm 1321 and the rotating arm 1322 are arranged opposite each other, and a receiving notch matching the curvature of the outer wall of the measuring tube 420 is formed on their opposite sides to ensure that the measuring tube 420 can naturally conform when clamped, avoiding surface damage caused by uneven force or point contact. The second driving member can be a pneumatic drive, which is mounted on the first support frame 131 and connected to the rear end of the movable arm 1321. The second driving member drives the movable arm 1321 to reciprocate linearly along a first direction to achieve clamping and releasing actions.

[0063] The rotating arm 1322 is hinged to the first support frame 131 via a rotating shaft and a torsion spring. A gripping rod 13221 is provided at the end of the rotating arm 1322 away from the first support frame 131. The operator can rotate the rotating arm 1322 by moving the gripping rod 13221, causing the receiving notch to gradually press against the outer wall of the measuring tube 420, thus achieving auxiliary clamping. The torsion spring on the rotating shaft of the rotating arm 1322 provides an automatic reset torque after the rotating arm 1322 is moved, ensuring that the rotating arm 1322 always faces the clamping direction when not in operation. This further ensures that the measuring tube 420 has a certain pre-position before pneumatic clamping, preventing workpiece wobbling.

[0064] Please see Figure 3 and Figure 4 In some embodiments, the clamping mechanism 140 includes a second support frame 141, a third drive member 142, a drive rod 143, and a clamping block 144. The second support frame 141 is fixed to the first support frame 131, the third drive member 142 is disposed on the top of the second support frame 141, one end of the drive rod 143 is connected to the third drive member 142, and the other end of the drive rod 143 is connected to the clamping block 144, so that the third drive member 142 can drive the drive rod 143 and the clamping block 144 thereon to move up and down.

[0065] Specifically, the clamping mechanism 140 consists of a second support frame 141, a third drive component 142, a drive rod 143, and a clamping block 144. It is positioned above the first support frame 131 and provides vertical clamping force after the measuring tube 420 is assembled and positioned with the manifold body 410. The second support frame 141 is a vertically extending fixed frame, connected to the first support frame 131 by bolts or welding, ensuring the stability and load-bearing capacity of the mechanism during long-term use. The third drive component 142 is also a pneumatic component, installed on top of the second support frame 141. The power output end of the third drive component 142 is connected to the drive rod 143, enabling the extension and retraction of the drive rod 143 under pneumatic control. The other end of the drive rod 143 is connected to the clamping block 144, allowing the drive rod 143 to move the clamping block 144 up and down to clamp the measuring tube 420.

[0066] During the clamping process, when the pneumatic system supplies air to the third drive component 142, it pushes the drive rod 143 downward, causing the clamping block 144 to gradually press against the top of the measuring tube 420, firmly pressing the measuring tube 420 against the manifold body 410, ensuring that the two maintain a tight fit and stable positioning during welding. When the air is exhausted in the reverse direction, the clamping block 144 moves upward, releasing the clamping force on the measuring tube 420, thus facilitating the loading and unloading of the workpiece. The automatic clamping of the measuring tube 420 is achieved by driving the clamping mechanism 140, which ensures the stability and consistency of the clamping force, thereby effectively improving the quality and reliability of welding.

[0067] Please see Figure 4 and Figure 5 In some embodiments, the second support frame 141 is provided with a guide rail 145, and the clamping block 144 is disposed on the guide rail 145 and can move up and down along the guide rail 145. The bottom surface of the clamping block 144 opposite to the drive rod 143 is provided with an arc-shaped groove 1441, the shape of which is adapted to the top of the measuring tube 420.

[0068] Specifically, the second support frame 141 is machined with a vertical guide rail 145, which can be a "T"-shaped groove, used to restrict and guide the movement of the clamping block 144, allowing it to move up and down along a predetermined vertical path and preventing skewing during the clamping process. The bottom surface of the clamping block 144 is machined with an arc-shaped groove 1441, the curvature of which matches the outer wall of the measuring tube 420. When the clamping block 144 moves downward, the arc-shaped groove 1441 fits tightly against the top of the measuring tube 420, ensuring uniform force and stable clamping of the measuring tube 420 in the vertical direction. The limiting and guiding of the clamping block 144 by the guide rail 145 makes the clamping force more stable and precise. Simultaneously, the arc-shaped groove 1441 structure increases the contact area with the measuring tube 420, resulting in a more uniform force distribution, avoiding tube wall deformation caused by single-point force, and improving clamping stability and welding quality.

[0069] Please see Figure 3 In some embodiments, a limiting protrusion 146 is also provided on the second support frame 141. The limiting protrusion 146 is located below the clamping block 144 and corresponds to the position of the measuring tube 420. When the Coriolis flowmeter 400 is placed on the welding fixture 100, the limiting protrusion 146 can initially limit the top of the measuring tube 420, keeping it in a stable position before it is fully clamped. When the clamping block 144 presses the measuring tube 420 downwards in the vertical direction, the limiting protrusion 146 can cooperate with the clamping block 144 to provide bidirectional contact with the measuring tube 420, so as to avoid deformation of the measuring tube 420, thereby further ensuring welding accuracy.

[0070] Please see Figures 2 to 12 This embodiment also provides a welding method, which includes the following steps: S10. The measuring tube 420 of the Coriolis flowmeter 400 and the manifold body 410 are pre-positioned by the pre-positioning fixture 500, and the joint between the measuring tube 420 and the manifold body 410 is spot-welded and fixed.

[0071] Among them, such as Figure 11 and Figure 12 As shown, the pre-positioning fixture 500 may include a contoured arc-shaped top plate 510, a pull rod 520, and a positioning pin 530 connecting the pull rod 520 and the arc-shaped top plate 510. Two measuring tubes 420 and the manifold body 410 are placed on the pre-positioning fixture 500, so that the interfaces of the measuring tubes 420 and the manifold body 410 are initially matched, and spot welding is performed at the joint for initial fixation.

[0072] S20. Place the Coriolis flowmeter 400 on the welding fixture 100 and clamp and position it using the manifold clamping mechanism 120, the measuring tube clamping mechanism 130, and the pressing mechanism 140.

[0073] Specifically, the initially fixed Coriolis flowmeter 400 is placed on the working position of the welding fixture 100. First, by moving the clamping handle 1211, the first connecting rod 1212 and the second connecting rod 1213 drive the abutment part 122 to achieve pre-positioning of the manifold body 410. Then, the first driving member 1222 drives the clamping end 1223 to further abut and fix the openings at both ends of the manifold body 410; the second driving member drives the two moving arms 1321 to move away from each other, so as to cooperate with the rotating arm 1322 to clamp and fix the two sides of the measuring tube 420 laterally. The third driving member 142 drives the pressing block 144 to move downward, and the pressing block 144 vertically presses the measuring tube 420 onto the manifold body 410, thus completely fixing the Coriolis flowmeter 400.

[0074] S30. Place the pipe welding gun 152 on the tray 151 of the welding fixture 100 so that the welding port 1522 of the pipe welding gun 152 covers the joint between the measuring tube 420 and the manifold body 410.

[0075] Specifically, firstly, the baffle 1523 of the pipe welding torch 152 is opened, and then the pipe welding torch 152 is guided to move to the predetermined welding position through the limiting groove 1511, and the baffle 1523 of the pipe welding torch 152 is closed. The welding port 1522 of the pipe welding torch 152 covers the manifold joint between the measuring tube 420 and the manifold body 410. At this time, the sensor 1512 can transmit the position information of the pipe welding torch 152 to the controller 300.

[0076] S40. The welding torch 152 is driven by preset welding parameters to automatically complete the welding at the joint; after the welding is completed, the welding fixture 100 automatically releases and clamps the Coriolis flow meter 400.

[0077] The controller 300 controls the welding current (e.g., set according to pipe diameter and wall thickness within the range of 5A~120A), tungsten electrode rotation speed, welding speed, and shielding gas flow rate (preferably 99.99% argon, approximately 5~8 L / min, or adjusted according to the material) and other parameters to perform welding at four welding positions according to a preset program. After welding is completed, the controller 300 drives the clamping mechanism to release sequentially according to the program; finally, the operator removes the welded Coriolis flowmeter 400.

[0078] In summary, this embodiment provides a welding fixture 100 and a welding system. The base plate 110 of the welding fixture 100 is equipped with a manifold clamping mechanism 120, a measuring tube clamping mechanism 130, and a clamping mechanism 140. These mechanisms enable rapid and accurate positioning and fixing of the manifold body 410 and the measuring tube 420 before welding, ensuring stable relative positions during the welding process and avoiding deviations caused by manual adjustments. The clamping mechanism 140 applies pressure to the measuring tube 420 from top to bottom, ensuring a tight fit between the measuring tube 420 and the manifold body 410, effectively reducing welding gaps and deformation. Furthermore, the welding mechanism 150 uses a pipe welding torch 152 with a welding port 1522 that matches the shape of the measuring tube 420. This allows for stable movement to the welding position to complete the pipe welding in one pass, improving weld quality and strength, as well as welding efficiency and consistency. This significantly reduces the uncertainty caused by manual spot welding operations, ensuring the overall processing accuracy and reliability of the product.

[0079] Although the present invention has been described with reference to several typical embodiments, it should be understood that the terminology used is descriptive and exemplary, and not restrictive. Since the present 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 welding the manifold body and the measuring tube of a Coriolis flowmeter; characterized in that, The welding fixture includes: Base plate; A manifold clamping mechanism is disposed on the base plate; the manifold clamping mechanism includes two opposing clamping ends, with a space between the two clamping ends forming a manifold body mounting position; the two clamping ends can move relative to each other in a first direction to clamp and position the manifold body. A measuring tube clamping mechanism is provided on the base plate for clamping and fixing the measuring tube; A clamping mechanism is provided on the measuring tube clamping mechanism; the clamping mechanism can abut against the top of the measuring tube and can clamp the measuring tube from top to bottom, so that the measuring tube is tightly fitted to the manifold body; A welding mechanism includes a pipe welding gun and a tray; the tray is disposed on the base plate and located above the clamping end; the pipe welding gun is disposed on the tray and has a welding port that matches the shape of the measuring tube; the pipe welding gun can move along the tray so that the welding port of the pipe welding gun covers the junction of the manifold body and the measuring tube for welding and fixing.

2. The welding fixture according to claim 1, characterized in that, The manifold clamping mechanism includes a drive assembly and two abutment portions, which are spaced apart to form a manifold body mounting position; the opposite ends of the two abutment portions are the clamping ends; both abutment portions are slidably connected to the base plate and can slide relative to each other in a first direction; the drive assembly is connected to the abutment portions and can drive the abutment portions to move relative to each other in the first direction.

3. The welding fixture according to claim 2, characterized in that, The drive assembly includes a clamping handle, a first connecting rod, and a second connecting rod; the base plate is provided with a moving groove extending in a second direction; the clamping handle is slidably disposed in the moving groove; one end of the first connecting rod and the second connecting rod is rotatably connected to the clamping handle, and the other end of the first connecting rod and the second connecting rod is rotatably connected to the two abutting parts respectively; when the clamping handle moves along the moving groove, it can drive the abutting parts on the other end of the first connecting rod and the second connecting rod to move closer or further apart.

4. The welding fixture according to claim 3, characterized in that, The abutment portion includes a first driving member and a slider; the slider is slidably connected to the base plate, the first driving member is disposed on the slider and correspondingly connected to the clamping end; the first driving member can drive the clamping ends to move closer or further away from each other along a first direction to achieve automatic clamping or release of the manifold body.

5. The welding fixture according to claim 1, characterized in that, The measuring tube clamping mechanism includes a first support frame and two clamping arm assemblies; the first support frame is fixed on the base plate; the clamping arm assemblies are disposed on the first support frame and correspond to the measuring tube, so that the two clamping arm assemblies can clamp and fix the two sides of the measuring tube respectively.

6. The welding fixture according to claim 5, characterized in that, The clamping arm assembly includes a movable arm, a rotating arm, and a second driving member; the movable arm and the rotating arm are arranged opposite to each other, and the opposite sides of the movable arm and the rotating arm are provided with receiving notches that match the shape of the measuring tube; The second driving member is disposed on the first support frame and connected to the movable arm; the second driving member can drive the movable arm to reciprocate along the first direction; the rotating arm is rotatably connected to the first support frame, and a gripping rod is provided on the end of the rotating arm away from the first support frame, the gripping rod being used to drive the rotating arm to rotate.

7. The welding fixture according to claim 5, characterized in that, The clamping mechanism includes a second support frame, a third driving member, a driving rod, and a clamping block; the second support frame is fixed on the first support frame, the third driving member is disposed on the top of the second support frame, one end of the driving rod is connected to the third driving member, and the other end of the driving rod is connected to the clamping block; the third driving member can drive the driving rod and the clamping block on it to move up and down.

8. The welding fixture according to claim 7, characterized in that, The second support frame is provided with a guide rail that extends vertically; the clamping block is disposed on the guide rail and can slide up and down along the guide rail; the bottom surface of the clamping block opposite to the drive rod is provided with an arc-shaped groove, the shape of which is adapted to the top shape of the measuring tube.

9. The welding fixture according to claim 1, characterized in that, The tray has a limiting groove, and the pipe welding gun can move along the side wall of the limiting groove so that the welding port of the pipe welding gun is aligned with the junction of the manifold body and the measuring tube; the limiting groove of the tray is equipped with a sensor, which is used to identify the position of the pipe welding gun to determine whether the pipe welding gun is in the welding working position.

10. A welding system, characterized in that, include: Welding fixture as described in any one of claims 1-9; The workbench has a base plate for the welding fixture on its upper surface. The workbench integrates a welding system and a pneumatic system. The pneumatic system is connected to the manifold clamping mechanism, the measuring tube clamping mechanism, and the pressing mechanism to drive them to automatically clamp the Coriolis flowmeter. The welding system is connected to the pipe welding gun to drive the pipe welding gun to automatically weld. A controller, connected to the workbench, is used to control the operating parameters of the welding system and the pneumatic system.

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