Protective cover for protecting plasma cladding nozzle

Abstract

The invention discloses a protective cover for protecting a plasma cladding nozzle, which consists of a protective sheet and a bracket, can be additionally arranged on a protective sleeve of the plasma cladding nozzle, and can be used for replacing the protective sheet at any time under the condition of ensuring the normal operation of plasma cladding, so that a powder feeding hole is prevented from being blocked by sputtering of a molten pool, and the damage of sputtering of the molten pool to the nozzle is reduced. Long-time stable work of plasma cladding is guaranteed, the service life of the nozzle is prolonged, and the maintenance difficulty of the nozzle in the plasma cladding process and after work is reduced.

Description

Technical Field

[0001] The invention designs a protective cover for protecting a plasma cladding nozzle and belongs to the field of modern advanced manufacturing technology. Background Art

[0002] Plasma cladding technology uses the high-energy plasma arc generated by the nozzle of the cladding head as the heat source and suitable powdered or filamentary materials as the cladding raw materials. The powdered raw materials are generally melted by the synchronous powder feeding method, and then a molten pool is formed on the surface of the substrate and solidified rapidly, finally obtaining a cladding layer with specific functions.

[0003] However, similar to various welding techniques and laser cladding, spatter will also occur during plasma cladding. When powder is used as raw material, the spatter phenomenon will be more serious, especially when mixed powders with large differences in thermal properties, particle size, and particle shape are used as raw materials, the spatter phenomenon will be further aggravated. Limited by the length of the plasma arc, the distance between the nozzle in the plasma cladding head and the molten pool is very small, generally not more than 50mm. Therefore, this spatter phenomenon will cause the spatter to adhere to or even melt on the nozzle of the plasma cladding head. In mild cases, it will disrupt the protective airflow. In severe cases, it will block the supply of powder and even block the powder feeding hole, thereby affecting the reliability and stability of plasma cladding.

[0004] The invention discloses a protective cover for protecting a plasma cladding nozzle. The protective cover consists of a protective sheet and a bracket and can be installed on a protective sleeve of the plasma cladding nozzle. Under the condition that the normal operation of the plasma cladding is ensured, the protective sheet can be replaced at any time to avoid the blockage of the powder feeding hole by the sputtering of the molten pool, reduce the damage of the sputtering of the molten pool to the nozzle, ensure the long-term stable operation of the plasma cladding, extend the working life of the nozzle, improve the quality of the plasma cladding coating, and reduce the difficulty of nozzle maintenance during and after the plasma cladding process. Summary of the invention

[0005] A protective cover for protecting a plasma cladding nozzle, characterized in that it is composed of a protective sheet and a bracket, can be installed on the protective cover of the plasma cladding nozzle, can replace the protective sheet during the plasma cladding process, can reduce the damage to the nozzle caused by the molten pool sputtering, and reduce the difficulty of nozzle maintenance. After the protective cover is installed, the normal operation of the plasma cladding is not affected.

[0006] Figure 1 It is a schematic diagram of the structure of the protective sheet of the present invention.

[0007] Figure 2 It is a bottom view of the protective sheet assembly structure of the present invention.

[0008] Figure 3 It is a front view of the protective cover assembly structure of the present invention.

[0009] Specific embodiment 1: (1) Before starting plasma cladding, fix the protective cover bracket 1 on the plasma nozzle protective cover, install the bracket 2 equipped with the protective sheet on the bracket 1 and fix it in a suitable position to ensure that the protective sheet can play a protective effect and does not affect the normal operation of the plasma cladding system; (2) Turn on the plasma cladding system, debug, and confirm the existence of the protective cover, which does not affect the normal operation of the arc starting, powder supply, and protective airflow of the plasma cladding nozzle, and does not affect the normal cladding of the workpiece surface by the plasma transfer arc; (3) Start the plasma cladding process; (4) After completing the plasma cladding process, loosen the fixation of the bracket 2, remove it from the bracket 1, clean the spatter on the protective sheet or replace the protective sheet; (5) Install the bracket 2 equipped with the protective sheet on the bracket 1 and fix it in a suitable position to prepare for the next round of plasma cladding process.

[0010] Specific embodiment 2: (1) Before starting plasma cladding, fix the protective cover bracket 1 on the plasma nozzle protective sleeve, install the bracket 2 equipped with the protective sheet on the bracket 1 and fix it in a suitable position to ensure that the protective sheet can play a protective effect and does not affect the normal operation of the plasma cladding system; (2) Turn on the plasma cladding system, debug, and confirm that the existence of the protective cover does not affect the normal operation of the arc starting, powder supply, and protective airflow of the plasma cladding nozzle, and does not affect the normal cladding of the workpiece surface by the plasma transfer arc; (3) Start the plasma cladding process; (4) During the plasma cladding process, if it is found that the protective cover needs to be replaced When installing the protective sheet, during normal plasma cladding, loosen the fixation of the bracket 2 on one side, remove it from the bracket 1, and install the spare bracket 2 equipped with the protective sheet; (5) loosen the fixation of the bracket 2 on the other side, remove it from the bracket 1, and install the spare bracket 2 equipped with the protective sheet; (6) after the plasma cladding process is completed, loosen the fixation of the bracket 2, remove it from the bracket 1, remove the spatter on the protective sheet or replace the protective sheet; (7) observe the plasma cladding nozzle for cleaning and maintenance; (8) install the bracket 2 equipped with the protective sheet on the bracket 1 and fix it in a suitable position, preparing for the next round of plasma cladding process.

Claims

1. A protective cover for protecting a plasma cladding nozzle, characterized in that: It consists of a protective sheet and a bracket, which can be installed on the protective cover of the plasma cladding nozzle. The protective sheet can be replaced during the plasma cladding process, which can reduce the damage to the nozzle caused by the spattering of the molten pool and reduce the difficulty of nozzle maintenance.

2. The protective cover according to claim 1, characterized in that: After the protective cover is installed, the normal operation of plasma cladding will not be affected.

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