Surfacing and positioning tool for valve element of anti-surge valve of compressor

Abstract

The utility model relates to a compressor anti-surge valve core surfacing positioning tool, an upper plate of a valve core is provided with an upper balance hole, a lower plate of the valve core is provided with a lower balance hole corresponding to the upper balance hole, the tool is provided with a bottom plate which is installed on a positioner during surfacing, the bottom plate is fixedly connected with four pull rods which are arranged in a matrix mode, and the four pull rods are fixedly connected with the bottom plate. The pull rod penetrates through the lower balance hole and the upper balance hole of the valve element to fix the valve element, and a cushion block is installed between the bottom face of a lower plate of the valve element and the bottom plate and used for preventing interference with the valve element when surfacing is conducted to the bottom of the valve element. According to the utility model, the valve core can be subjected to full surfacing operation at one time under the condition of one-time clamping, so that the operation safety is ensured; a series of problems of cracking risk of a surfacing layer caused by temperature drop of a valve element workpiece, poor weld forming caused by welding position deviation, non-uniform thickness of the surfacing layer, difficulty in alignment in subsequent machining and the like can be effectively prevented, and the welding processing efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of welding technology, and in particular to a positioning fixture for welding the valve core of a compressor anti-surge valve. Background Technology

[0002] Because the working medium of the compressor anti-surge valve contains natural gas-like gases containing hydrogen sulfide and some impurity particles, the compressor flow rate must be controlled to prevent surge in order to ensure that the valve opens rapidly within 2 seconds. Full welding of the valve core can increase hardness, reducing the erosion and friction caused by impurities, while also preventing deformation of the sealing surface and friction guide surface, thereby avoiding valve core jamming and preventing surge.

[0003] The hardening method used for full overlay welding of valve core is usually PTA plasma overlay welding. Because the anti-surge valve is large and its valve core is heavy, the corresponding hardening area is also large, so the overlay welding time is long and the welding process requirements are high.

[0004] The conventional welding fixture installation method requires two clamping and welding processes. First, one end of the valve core is clamped and welded. Then, the valve core is turned around, clamped, and the other end is welded to achieve full-area welding. Before turning around to weld the other end, a heat treatment and heat preservation process is required. Furthermore, when turning around and clamping again, it is heated again with an oxy-acetylene flame. The expansion caused by heating affects the reference position of the workpiece, requiring realignment to ensure the workpiece position is within the set error range before welding. Therefore, the entire welding process is time-consuming and has very low overall welding efficiency. Utility Model Content

[0005] The technical problem to be solved by this utility model is: in order to overcome the shortcomings of the prior art, this utility model provides a positioning fixture for welding the valve core of a compressor anti-surge valve that can complete the full-area welding of the valve core in one clamping.

[0006] The technical solution adopted by this utility model to solve its technical problem is: a positioning fixture for welding the valve core of a compressor anti-surge valve, wherein the upper plate of the valve core has an upper balance hole, and the lower plate of the valve core has a lower balance hole corresponding to the upper balance hole. The fixture has a base plate that is installed on a positioner during welding. Four tie rods arranged in a matrix are fixed to the base plate. The tie rods pass through the lower balance hole and the upper balance hole of the valve core to fix the valve core. A pad is installed between the bottom surface of the lower plate of the valve core and the base plate to prevent interference with the valve core when welding to the bottom of the valve core.

[0007] To ensure accurate installation of the valve core, the lower plate of the valve core has a positioning hole in the middle, and a positioning mandrel that mates with the positioning hole is fixed on the upper surface of the base plate.

[0008] Specifically, in order to better fix the valve core to the base plate, a locking nut for locking the lever is connected to the lever between the bottom surface of the lower plate of the valve core and the base plate, and a pressure plate is provided at the upper end of the lever to press against the upper plate of the valve core.

[0009] Furthermore, the upper end of the pull rod is connected to a clamping nut for clamping the pressure plate.

[0010] The beneficial effects of this utility model are: this utility model can complete the full overlay welding operation of the valve core in one clamping, ensuring operational safety, effectively preventing a series of problems such as the risk of cracking of the overlay layer caused by the drop in temperature of the valve core workpiece, poor weld formation caused by welding position deviation, uneven overlay layer thickness, and difficulty in subsequent machining alignment, thus improving welding processing efficiency. Attached Figure Description

[0011] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0012] Figure 1 This is a schematic diagram of the structure of this utility model.

[0013] In the diagram: 1. Valve core, 2. Upper balance hole, 3. Lower balance hole, 4. Base plate, 5. Pull rod, 6. Pad, 7. Positioning hole, 8. Positioning spindle, 9. Locking nut, 10. Pressure plate, 11. Pressure nut. Detailed Implementation

[0014] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0015] like Figure 1 The invention relates to a welding and positioning fixture for a compressor anti-surge valve core. The valve core 1 has an upper plate and a lower plate. The upper plate of the valve core has four upper balance holes 2 arranged in a matrix, and the lower plate of the valve core has four lower balance holes arranged in a matrix and corresponding to the upper balance holes. A positioning hole 7 is located at the center of the lower plate of the valve core.

[0016] The aforementioned welding positioning fixture includes a base plate 4, which is mounted on a positioner and rotates with the positioner during welding. Four threaded holes are arranged in a matrix on the base plate 4, and a pull rod 5 with external threads at both ends is connected to each threaded hole. A locking nut 9 is connected to the external thread at the lower end of the pull rod 5 to lock the pull rod 5. The pull rod 5 passes through the lower balance hole 3 and the upper balance hole 2 of the valve core 1 and extends out of the upper plate of the valve core 1. A pad 6 is fixed on the base plate 4 outside each pull rod 5, which contacts the bottom surface of the lower plate of the valve core 1. The pad 6 separates the bottom surface of the lower plate of the valve core 1 from the base plate 4 by a distance, thus preventing interference with the valve core 1 when welding to the bottom of the valve core 1.

[0017] The upper end of the pull rod 5 is fitted with a pressure plate 10, and a clamping nut 11 is connected to the external thread at the upper end of the pull rod 5 to clamp the pressure plate 10, thereby fixing the valve core 1 to the base plate 4.

[0018] A positioning mandrel 8 is fixed on the upper surface of the base plate 4 located at the center of the four tie rods 5. The positioning mandrel 8 is inserted into the positioning hole 7 to realize the installation and positioning of the valve core 1.

[0019] Valve core 1 is preheated before clamping. First, screw the four tie rods 5 into the threaded holes on the base plate 4, and tighten the locking nuts 9 to lock the tie rods 5. Place the pads 6 on the corresponding positions on the base plate 4 and spot weld them in place. Hoist the valve core 1 and insert the tie rods 5 into the lower balance hole 3 and upper balance hole 2 of the valve core 1 respectively. At the same time, use the positioning mandrel 8 to position the valve core 1 in the positioning hole 7, ensuring that the bottom surface of the lower plate of the valve core 1 rests on the pads 6. Finally, after installing the pressure plate 10 and washer on the upper end of the tie rods 5, tighten the clamping nut 11 on the external thread of the upper end of the tie rods 5 to fix the valve core 1 on the base plate 4. Start the positioner to perform the overlay welding operation. During the welding process, the interpass temperature is measured in real time. When the interpass temperature is lower than the specified value, oxy-acetylene flame heating is used. The entire welding process can be carried out continuously without interruption.

[0020] After applying the above tooling, the entire welding operation of valve core 1 can be completed with just one clamping. This can effectively prevent a series of problems such as cracking of the weld overlay caused by the temperature drop of valve core 1 during the welding process, poor weld formation caused by welding position deviation, uneven weld overlay thickness, and difficulty in subsequent machining alignment, thereby improving welding efficiency.

[0021] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A positioning fixture for welding the valve core of a compressor anti-surge valve, wherein the upper plate of the valve core (1) has an upper balance hole (2), and the lower plate of the valve core (1) has a lower balance hole (3) corresponding to the upper balance hole (2), and the fixture has a base plate (4) that is mounted on a positioner during welding, characterized in that: Four tie rods (5) arranged in a matrix are fixed on the base plate (4). The tie rods (5) pass through the lower balance hole (3) and the upper balance hole (2) of the valve core (1) to fix the valve core (1). A pad (6) is installed between the bottom surface of the lower plate of the valve core (1) and the base plate (4) to prevent interference with the valve core (1) when it is welded to the bottom.

2. The compressor anti-surge valve core welding positioning fixture as described in claim 1, characterized in that: The valve core (1) has a positioning hole (7) in the middle of the lower plate, and the upper end face of the base plate (4) is fixed with a positioning mandrel (8) that cooperates with the positioning hole (7).

3. The compressor anti-surge valve core welding positioning fixture as described in claim 1, characterized in that: The bottom surface of the lower plate of the valve core (1) and the bottom plate (4) are connected to the pull rod (5) with a locking nut (9) for locking the pull rod (5). The upper end of the pull rod (5) is provided with a pressure plate (10) that presses against the upper plate of the valve core (1).

4. The compressor anti-surge valve core welding positioning fixture as described in claim 3, characterized in that: The upper end of the pull rod (5) is connected to a clamping nut (11) of the clamping plate (10).

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