A butt welding welding tool

Abstract

The utility model provides a butt welding welding frock, including base and setting movable centre of the both ends of base, two movable centre of the both ends are opposite setting, moving along the guide rail on base, at least one movable centre of the both ends can be active rotation, at least one movable centre of the both ends head has the air pipe, both sides of movable centre of the both ends are provided with dial gauge and polishing mechanism respectively, the utility model discloses two section plug -in throttle ware parts are clamped through movable centre of the both ends, and drive slow rotation, carry out butt joint welding to butt joint seam, and the air pipe passes into the protective gas to the throttle ware simultaneously, welding passes through dial gauge real -time detection throttle ware run -out condition simultaneously, and the welding process is adjusted according to run -out condition, can polish the weld through polishing mechanism after welding is completed, the utility model discloses be applicable to the butt joint welding of throttle ware parts, have the advantages such as high clamping precision, welding uniformity is good, gas protection function and real -time monitoring function, can significantly improve the welding quality and efficiency of throttle ware.

Description

Technical Field

[0001] This utility model belongs to the field of welding fixture technology, and in particular relates to a welding fixture for a nickel-based alloy throttle for fourth-generation nuclear power. Background Technology

[0002] Expansion joints are widely used in once-through steam generators, where the steam inlet is subcooled water and the outlet is supersteam. In the heat exchanger tube bundle of a steam generator, the heat exchange medium on the secondary side undergoes a phase change, resulting in a two-phase vapor-liquid flow. To prevent vapor-liquid instability, expansion joints are typically installed at the inlet of the heat exchanger tube bundle. Due to their high accuracy in controlling the pressure drop of the throttled fluid, expansion joints are usually designed with 2-3 throttling orifices. Considering the feasibility of machining, they are often divided into multiple sections, machined individually, and then welded. The permitted welding method is generally gas tungsten inert gas (GTAW). When using manual GTAW with standard welding fixtures, the following problems arise when fixing the expansion joint: insufficient clamping accuracy; easy displacement of the expansion joint due to thermal contraction during welding, affecting weld quality; lack of rotational drive function, making it difficult to guarantee weld uniformity; and inability to detect expansion joint movement during welding, making it difficult to ensure welding accuracy. Summary of the Invention

[0003] The purpose of this invention is to provide a butt welding fixture with high clamping accuracy, capable of real-time detection of runout during welding, and capable of grinding the weld seam, to meet the special requirements of throttle welding.

[0004] To achieve the above objectives, this utility model adopts the following technical solution: A butt welding fixture includes a base and movable tips at both ends of the base, with the two movable tips facing each other and moving along a guide rail on the base. The fixture is characterized in that at least one movable tip is rotatable and has a vent pipe at its head; a dial indicator and a grinding mechanism are respectively provided on both sides of each movable tip. Two inserted throttle components are clamped and positioned by the two movable tips and slowly rotated. A protective gas is introduced into the throttle through the vent pipe while the butt joint is butt-welded. During welding, the throttle runout is monitored in real time by the dial indicator, and the welding process is adjusted according to the runout. After welding, the weld can be ground by the grinding mechanism. This welding fixture is suitable for butt welding of throttle components while ensuring welding accuracy.

[0005] A further feature is that: a lead screw is provided on one side of the base, and an L-shaped bracket is threaded onto the lead screw; one end of the horizontal support of the L-shaped bracket is fastened to the guide rail of the base; the dial indicator is mounted on the vertical support of the L-shaped bracket; the vertical support moves back and forth within the concave groove of the horizontal support. The L-shaped bracket mounted on the lead screw allows the dial indicator to move back and forth and left and right to accommodate the detection of runout at different positions of the throttle component.

[0006] Preferably, the lead screw is driven to rotate by a servo motor, making the L-shaped bracket more accurately positioned. The dial indicator is connected to the vertical bracket via a ball joint, facilitating adjustment of the dial indicator's position.

[0007] Preferably, the grinding mechanism includes a grinding base movably mounted on the guide rail, the grinding base being connected to a U-shaped clamping block, and grinding material being held within the U-shaped clamping block. The grinding mechanism can move on the guide rail to grind welds at different locations, and also allows for easy replacement of the grinding material within the U-shaped clamping block.

[0008] Preferably, the polishing material is a polishing stone, a scouring pad, or sandpaper, to suit different weld polishing methods.

[0009] Preferably, the movable tip on one side is connected to the motor and rotates, while the movable tip on the other side rotates voluntarily, and the head is hollow.

[0010] This invention uses a movable tip to clamp two interlocking throttle components and slowly rotate them to perform butt welding on the joint. Simultaneously, a protective gas is introduced into the throttle through a vent pipe. During welding, a dial indicator monitors the throttle's movement in real time, and the welding process is adjusted accordingly. After welding, the weld seam is ground using a grinding mechanism. This invention is suitable for butt welding of throttle components and offers advantages such as high clamping precision, good welding uniformity, gas protection, and real-time monitoring, significantly improving the welding quality and efficiency of throttles. Attached Figure Description

[0011] Figure 1 is a schematic diagram of the structure of this utility model.

[0012] Figure 2 is a schematic diagram of the grinding mechanism.

[0013] Figure 3 is a schematic diagram of the dial indicator installation structure. Detailed Implementation

[0014] like Figure 1As shown, a butt welding fixture includes a base 1 and two movable centers, a left movable center 2 and a right movable center 5, located at opposite ends of the base 1. The two movable centers move along guide rails on the base 1. The right movable center 5 is connected to a motor 7 and is driven to rotate by the variable frequency motor 7. The left movable center 2 rotates passively, has a hollow head, and is equipped with a vent pipe 6. A grinding base 3 and an L-shaped bracket 10 are respectively installed on the guide rails on both sides of the movable centers. Grinding material 41 is installed on the grinding base 3. A dial indicator 11 is installed on the L-shaped bracket 10.

[0015] like Figure 1 , 2 As shown, a U-shaped clamping block 4 is provided on the grinding base 3, and a grinding material 41 is clamped inside the U-shaped clamping block 4. The grinding material 41 can be a grinding stone, a scouring pad, or sandpaper, to suit different weld grinding applications.

[0016] like Figure 1 , 3 As shown, one end of the horizontal support of the L-shaped bracket 10 is fastened to the guide rail of the base 1. The L-shaped bracket 10 is threaded onto the lead screw 9 on one side of the base 1. The dial indicator 11 is mounted on the vertical support of the L-shaped bracket 10. The vertical support moves back and forth within the concave groove of the horizontal support. The lead screw 9 is driven to rotate by the servo motor 12, making the positioning of the L-shaped bracket 10 more precise. The dial indicator 11 is connected to the vertical support via a ball joint 13.

[0017] In use, the two-section plug-in throttle components are clamped and positioned by two movable centers, which then slowly rotate them. Protective gas is introduced into the throttle via the vent pipe 6, while the joint is simultaneously welded. During welding, the throttle's vibration is monitored in real time using a dial indicator 11, and the welding process is adjusted accordingly. After welding, the weld can be polished using a polishing material 41.

Claims

1. A butt welding fixture, comprising a base and movable centers disposed at both ends of the base, wherein the two movable centers are disposed facing each other and move along a guide rail on the base; characterized in that: At least one of the movable tips can rotate actively, and at least one of the movable tips has a vent tube at its head; a dial indicator and a grinding mechanism are respectively provided on both sides of the movable tip.

2. The butt welding fixture as described in claim 1, characterized in that: A lead screw is provided on one side of the base, and an L-shaped bracket is threaded onto the lead screw. One end of the horizontal support of the L-shaped bracket is fastened to the guide rail of the base. The dial indicator is installed on the vertical support of the L-shaped bracket. The vertical support moves back and forth within the concave groove of the horizontal support.

3. The butt welding fixture as described in claim 2, characterized in that: The lead screw is driven to rotate by a servo motor; the dial indicator is connected to the vertical support through a ball joint.

4. The butt welding fixture as described in any one of claims 1-3, characterized in that: The polishing mechanism includes a polishing base movably mounted on the guide rail, and a U-shaped clamping block is connected to the polishing base, with polishing material clamped inside the U-shaped clamping block.

5. The butt welding fixture as described in claim 4, characterized in that: The polishing material is a polishing stone, scouring pad, or sandpaper.

6. The butt welding fixture as described in any one of claims 1-3, characterized in that: One of the movable tips is connected to a motor and rotates, while the other movable tip rotates automatically, and the head is hollow.

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