Heat treatment cover for underwater local metal heat treatment

Abstract

The invention discloses a heat treatment cover for underwater local metal heat treatment, which comprises a heat treatment cover body, the heat treatment cover body comprises a heating layer, a waterproof layer is arranged at the bottom of the heating layer, a waterproof heat preservation layer is arranged outside the heating layer, and a temperature control structure is arranged on the heating layer. The temperature control structure is connected with the power source through a waterproof electric wire, a gas transmission mechanism is arranged outside the heat treatment cover body and connected with the waterproof heat preservation layer, and the heat treatment cover separates the interior from the external environment, so that heat treatment is not affected by external factors; the heat treatment cover can be produced in a customized mode so as to meet different laser repair size requirements, meanwhile, the heat treatment cover can be used for water heat treatment after local laser cladding repair of a large part after simple transformation, and the application range is wide.

Description

Technical Field

[0001] The invention relates to the field of laser cladding, and in particular to a heat treatment cover for underwater local metal heat treatment. Background Art

[0002] With the continuous development of laser cladding technology and the advancement of underwater laser cladding technology, local laser repair of underwater components, especially underwater parts of the hull, is an important development direction. The materials commonly used in laser cladding repair, such as maraging steel, titanium alloy, etc., need to be heat treated to improve their performance and meet the use requirements, so underwater heat treatment is a problem that needs to be solved in underwater laser cladding repair. For the heat treatment of metal materials, the more commonly used heat treatment method is a high-temperature resistance furnace. The high-temperature resistance furnace generates heat based on the thermal effect generated when the current passes through the resistor to achieve the purpose of high-temperature heat treatment. The high-temperature resistance furnace has the characteristics of high thermal efficiency and uniform temperature, but the high-temperature resistance furnace is limited by the size of the heating element. It is impossible to heat treat the local repair part of a large object, and it is impossible to perform underwater heat treatment. In view of this, the present application proposes a heat treatment hood for underwater local metal heat treatment to solve the above problems. Summary of the invention

[0003] In view of the problems existing in the prior art, the present invention proposes a heat treatment cover for underwater local metal heat treatment, so as to achieve heat treatment of the repair area after underwater laser cladding.

[0004] To achieve the above object, the technical solution of the present invention is as follows: A heat treatment hood for underwater local metal heat treatment comprises a heat treatment hood body, the heat treatment hood body comprises a heating layer, a waterproof layer is provided at the bottom of the heating layer, a waterproof and heat-insulating layer is provided outside the heating layer, a temperature control structure is provided on the heating layer, the temperature control structure is connected to a power source through a waterproof wire, an air transmission mechanism is provided outside the heat treatment hood body, and the air transmission mechanism is connected to the waterproof and heat-resistant layer.

[0005] Furthermore, the waterproof and heat-insulating layer includes a high-temperature heat-insulating layer and a waterproof and heat-resistant layer from the inside to the outside, the waterproof and heat-resistant layer is connected to the high-temperature heat-insulating layer by means of glue, and the high-temperature heat-insulating layer is connected to the heating layer by means of glue.

[0006] Furthermore, the high-temperature insulation layer is asbestos with a thickness of 10-20 mm; the waterproof and heat-resistant layer is a PEVA film with a thickness of 100-200 μm; the heating layer is a crawler-type ceramic electric heating plate; and the waterproof layer is epoxy resin.

[0007] Furthermore, the temperature control structure includes a temperature sensor and a temperature control device, the temperature sensor is installed on the heating layer, the temperature sensor is electrically connected to the temperature control device, and the temperature control device is connected to a power source via a waterproof wire.

[0008] Furthermore, the gas delivery mechanism includes a gas delivery bottle, an air extraction pump and a gas storage bottle. The gas delivery bottle is arranged on one side of the heat treatment cover body, and the gas delivery bottle is connected to the waterproof and heat-resistant layer through a gas delivery pipeline. A gas storage bottle is provided on the other side of the heat treatment cover body, and the gas storage bottle is connected to the waterproof and heat-resistant layer through an air outlet pipeline, and an air extraction pump is provided on the air outlet pipeline.

[0009] Furthermore, it comprises a waterproof joint, which is installed at the end of the gas pipeline, an external threaded pipe is installed on the waterproof and heat-resistant layer, and the waterproof joint is connected to the external threaded pipe.

[0010] Furthermore, an electromagnet is provided on the waterproof and heat-resistant layer, and a sealing ring is installed in the groove where the electromagnet contacts the waterproof joint and the waterproof and heat-resistant layer.

[0011] Furthermore, a water vapor flow meter and a one-way valve are installed on the gas transmission pipeline.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows: 1) The present invention first uses an electromagnet to fix the heat treatment cover at the position after laser repair, and then starts to heat the heating layer to a temperature at which water between the heat treatment cover and the repaired part evaporates. At the same time, the gas cylinder and the vacuum pump are turned on to discharge the water vapor through the air supply pipe, and the water vapor flow meter is used to determine whether the water vapor is emptied. After the water vapor is emptied, the temperature is raised to the decomposition temperature of the epoxy resin to decompose the epoxy resin into gas. After the steam in the heating cover is emptied, the gas cylinder flow and the vacuum pump power are reduced to keep the air pressure in the heating cover lower than the external water pressure, so that the heating cover is closely attached to the part to be heat treated under the action of the external water pressure, and the temperature of the heating layer is continuously raised. The temperature is observed by the temperature sensor, and the timing is started when the temperature is raised to the heat treatment temperature. After the heat treatment time is over, the gas cylinder flow is increased to balance the pressure inside and outside the heat treatment cover for easy removal, and the electromagnet is turned off to remove the heat treatment cover.

[0013] 2) The heat treatment cover of the present invention separates the interior from the external environment, so that the heat treatment can be unaffected by external factors; 3) The heat treatment cover of the present invention can be customized to meet the requirements of different laser repair sizes. At the same time, the heat treatment cover of the present invention can also be used for water heat treatment of large parts after local laser cladding repair after simple modification, and has a wide range of applications; 4) The heat treatment cover of the present invention has a simple and reasonable structure and is easy to implement in terms of manufacturing process. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the structure of the heat treatment cover body of the present invention; Figure 2 A top view of the heat treatment cover of the present invention; Figure 3 This is a front view of the heat treatment cover of the present invention; Figure 4 A top view of the heat treatment cover of the present invention; Figure 5 It is a partial cross-sectional view of the threaded pipe and waterproof interface of the underwater heat treatment cover.

[0015] In the figure: 1. Heat treatment cover body; 2. High-temperature insulation layer; 3. Heating layer; 4. Waterproof layer; 5. Waterproof and heat-resistant layer; 6. Waterproof wire; 7. Temperature control device; 8. Power supply; 9. Gas cylinder; 10. Gas pipeline; 11. Vacuum pump; 12. Air outlet pipeline; 13. Gas storage cylinder; 14. Waterproof joint; 15. Externally threaded pipe; 16. Water vapor flow meter; 17. Electromagnet; 18. Sealing ring; 19. Temperature sensor. DETAILED DESCRIPTION

[0016] The present invention will be further described below in conjunction with the accompanying drawings, but the scope of protection of the present invention is not limited to the described scope.

[0017] Please refer to Figure 1-5 A heat treatment cover for underwater local metal heat treatment includes a heat treatment cover body 1, the heat treatment cover body 1 includes a heating layer 3, which provides a heat source for heat treatment, and a waterproof layer 4 is provided at the bottom of the heating layer 3 to prevent the heating layer 3 from contacting water during installation. After the water in the heating cover is evaporated into water vapor and emptied to form a dry environment, the temperature is raised to the boiling point of the waterproof layer to vaporize and discharge the waterproof layer 4 to avoid the influence of the waterproof layer 4 on the heat treatment.

[0018] A waterproof insulation layer is provided outside the heating layer 3, a temperature control structure is provided on the heating layer 3, the temperature control structure is connected to the power supply 8 through a waterproof wire 6, and a gas supply mechanism is provided outside the heat treatment cover body 1, and the gas supply mechanism is connected to the waterproof insulation layer.

[0019] The waterproof and heat-insulating layer includes a high-temperature heat-insulating layer 2 and a waterproof and heat-resistant layer 5 from the inside to the outside. The waterproof and heat-resistant layer 5 is connected to the high-temperature heat-insulating layer 2 by means of glue, and the high-temperature heat-insulating layer 2 is connected to the heating layer 3 by means of glue.

[0020] The high-temperature insulation layer 2 is an insulation layer made of asbestos, which has heat insulation functions. It can isolate high temperatures during heat treatment, reduce internal and external heat exchange, reduce energy loss, speed up heating, and protect the external waterproof and heat-resistant layer 5 from being damaged by the high temperature of the heating layer 3. It must have a certain waterproof function so that the insulation effect will not be reduced by water during installation.

[0021] The waterproof and heat-resistant layer 5 is a waterproof and heat-resistant layer made of polyethylene, which is used to separate the internal environment composed of the heat treatment cover and the part to be heat-treated from the external water environment, preventing external water from entering the interior during the heating process, and playing a certain thermal insulation function, reducing the heat exchange between the inside and the outside during heat treatment, and reducing energy loss.

[0022] In this embodiment, the high temperature insulation layer 2 is asbestos with a thickness of 10-20 mm; the waterproof and heat-resistant layer 5 is a PEVA film with a thickness of 100-200 μm; the heating layer 3 is a track-type ceramic electric heating plate; and the waterproof layer 4 is epoxy resin.

[0023] The temperature control structure includes a temperature sensor 19 and a temperature control device 7. The temperature sensor 19 is installed on the heating layer 3. The temperature sensor 19 is used to detect the temperature of the part to be heat treated in real time to observe whether the part to be heat treated can reach the required temperature for heat treatment and determine the heat preservation time during heat treatment. The temperature sensor 19 is electrically connected to the temperature control device 7, and the temperature control device 7 is connected to the power supply 8 through a waterproof wire 6.

[0024] The temperature control device 7 reads the temperature sensor data, adjusts the heating temperature in real time during the heat treatment process, and is connected to the power supply through the waterproof wire 6. The temperature control device can be placed on the water surface through a sufficiently long wire.

[0025] The gas delivery mechanism includes a gas delivery bottle 9, a vacuum pump 11 and a gas storage bottle 13. The gas delivery bottle 9 is filled with argon and other gases that do not react with the heated part under the heat treatment temperature conditions to provide a gas source and a pressure source for exhausting water vapor during the heating process and for subsequent internal pressurization.

[0026] The vacuum pump 11 extracts the water vapor and the gas after resin decomposition in the heating cover, and reduces the air pressure in the heating cover after the steam is exhausted, so that the heating cover can be closely attached to the part to be heated under the action of external water pressure.

[0027] The gas storage bottle 13 is connected to the gas outlet pipeline and is used for storing the exhaust gas in the heating hood.

[0028] The function of the gas pipeline 10 is to transport the gas in the gas cylinder to the internal environment composed of the heat treatment hood and the part to be heat treated, so as to discharge the water vapor in the internal environment when heating starts and provide a certain air pressure inside after the heat treatment is completed, so as to facilitate the removal of the heat treatment hood.

[0029] A gas delivery bottle 9 is arranged on one side of the heat treatment cover body 1, and the gas delivery bottle 9 is connected to the waterproof and heat-resistant layer 5 through a gas delivery pipe 10. A gas storage bottle 13 is arranged on the other side of the heat treatment cover body 1, and the gas storage bottle 13 is connected to the waterproof and heat-resistant layer 5 through an air outlet pipe 12, and an air pump 11 is arranged on the air outlet pipe 12.

[0030] In this embodiment, the gas delivery mechanism further includes a waterproof joint 14, which is used to connect the gas delivery pipe 10 with the external threaded pipe 15 on the waterproof and heat-resistant layer 5 to prevent water from entering the gas pipe and ensure air tightness.

[0031] The waterproof joint 14 is installed at the end of the gas pipeline 10 , an external threaded pipe 15 is installed on the waterproof and heat-resistant layer 5 , and the waterproof joint 14 is connected to the external threaded pipe 15 .

[0032] A water vapor flow meter 16 and a one-way valve are installed on the gas pipeline 10. The water vapor flow meter 16 detects whether the evaporated water vapor is discharged when heating starts, so as to adjust the gas pressure so that the external water pressure is higher than the internal air pressure, so that the heat treatment hood is close to the part to be heated under the pressure of the external water, thereby improving the heating effect.

[0033] An electromagnet 17 is provided on the waterproof and heat-resistant layer 5 for fixing the heat treatment cover so that the heat treatment cover can be closely attached to the position to be heated.

[0034] A sealing ring 18 is installed in the groove where the electromagnet 17 contacts the waterproof joint 14 and the waterproof and heat-resistant layer 5 to prevent external water from entering the interior during heat treatment and ensure the internal airtightness.

[0035] The power supply 8 provides power to the heating layer 3, the temperature control device 7, the electromagnet and the vacuum pump of the heat treatment cover.

[0036] The method for making the heat treatment cover of the present invention is as follows: 1) The heating layer 3 and the high temperature heat-insulating layer 2 are subjected to the steps of gluing, hot pressing and trimming, the high temperature heat-insulating layer 2 and the waterproof and heat-resistant layer 5 are subjected to the steps of gluing, hot pressing and trimming, and the electromagnet 17 is connected to the waterproof and heat-resistant layer 5 by gluing; 2) The heating layer 3 is connected to the temperature sensor 19, the temperature sensor 19 is connected to the temperature control device 7, and the temperature control device 7 is connected via a waterproof wire; 3) Connect each electrical device to the power supply through the waterproof wire 6; 4) Connect the gas pipeline 10 to the gas cylinder and the external waterproof and heat-resistant layer 5 through the waterproof joint 14, wherein the portion connected to the waterproof joint 14 and the gas pipeline 10 can be connected using a quick connector, and the portion connected to the waterproof and heat-insulating layer can be threadedly connected on the external threaded pipe 15 of the waterproof and heat-insulating layer.

[0037] The method for using the heat treatment cover of the present invention comprises the following steps: Step 1): Use electromagnet 17 to fix the heat treatment cover in the position after laser repair; Step 2): The heating layer 3 starts to heat to a temperature at which the water between the heat treatment cover and the repaired part evaporates, and at the same time, the gas cylinder and the vacuum pump 11 are turned on; Step 3) the water vapor is discharged through the gas outlet pipe 12, and the water vapor flow meter 16 is used to determine whether the water vapor is exhausted; Step 4) After exhausting the water vapor, the temperature is raised to the decomposition temperature of the epoxy resin to decompose the epoxy resin into gas; Step 5) After the steam in the heating hood is emptied, the flow rate of the gas cylinder and the power of the vacuum pump 11 are reduced to keep the air pressure in the heating hood lower than the external water pressure, so that the heating hood is closely attached to the part to be heat treated under the action of the external water pressure; Step 6) Continue to increase the temperature of the heating layer 3, observe the temperature through the temperature sensor 19, and start timing when the temperature reaches the heat treatment temperature; Step 7) After the heat treatment time is over, increase the gas flow rate of the cylinder to balance the pressure inside and outside the heat treatment hood so that it is easy to remove; Step 8) Turn off the electromagnet 17 and remove the heat treatment cover.

Claims

1. A heat treatment cover for underwater local metal heat treatment, characterized in that The invention comprises a heat treatment cover body (1), the heat treatment cover body (1) comprising a heating layer (3), a waterproof layer (4) being provided at the bottom of the heating layer (3), a waterproof heat-insulating layer being provided outside the heating layer (3), a temperature control structure being provided on the heating layer (3), the temperature control structure being connected to a power source (8) via a waterproof wire (6), and a gas transmission mechanism being provided outside the heat treatment cover body (1), the gas transmission mechanism being connected to the waterproof and heat-resistant layer.

2. A heat treatment cover for underwater local metal heat treatment according to claim 1, characterized in that The waterproof and heat-insulating layer comprises a high-temperature heat-insulating layer (2) and a waterproof and heat-resistant layer (5) from the inside to the outside, the waterproof and heat-resistant layer (5) is connected to the high-temperature heat-insulating layer (2) by means of glue, and the high-temperature heat-insulating layer (2) is connected to the heating layer (3) by means of glue.

3. A heat treatment cover for underwater local metal heat treatment according to claim 2, characterized in that The high-temperature insulation layer (2) is asbestos with a thickness of 10-20 mm; the waterproof and heat-resistant layer (5) is a PEVA film with a thickness of 100-200 μm; the heating layer (3) is a crawler-type ceramic electric heating plate; and the waterproof layer (4) is epoxy resin.

4. A heat treatment cover for underwater local metal heat treatment according to claim 1 or 3, characterized in that The temperature control structure comprises a temperature sensor (19) and a temperature control device (7); the temperature sensor (19) is mounted on the heating layer (3); the temperature sensor (19) is electrically connected to the temperature control device (7); and the temperature control device (7) is connected to a power source (8) via a waterproof wire (6).

5. A heat treatment cover for underwater local metal heat treatment according to claim 2, characterized in that The gas delivery mechanism comprises a gas delivery bottle (9), an air extraction pump (11) and a gas storage bottle (13); the gas delivery bottle (9) is arranged on one side of the heat treatment cover body (1); the gas delivery bottle (9) is connected to the waterproof and heat-resistant layer (5) via a gas delivery pipeline (10); a gas storage bottle (13) is arranged on the other side of the heat treatment cover body (1); the gas storage bottle (13) is connected to the waterproof and heat-resistant layer (5) via an air outlet pipeline (12); and the air extraction pump (11) is arranged on the air outlet pipeline (12).

6. A heat treatment cover for underwater local metal heat treatment according to claim 5, characterized in that It comprises a waterproof joint (14), the waterproof joint (14) being installed at the end of a gas transmission pipeline (10), an externally threaded pipe (15) being installed on the waterproof and heat-resistant layer (5), and the waterproof joint (14) being connected to the externally threaded pipe (15).

7. A heat treatment cover for underwater local metal heat treatment according to claim 6, characterized in that An electromagnet (17) is provided on the waterproof and heat-resistant layer (5), and a sealing ring (18) is installed in a groove at the contact point between the electromagnet (17), the waterproof joint (14) and the waterproof and heat-resistant layer (5).

8. A heat treatment cover for underwater local metal heat treatment according to claim 5, characterized in that A water vapor flow meter (16) and a one-way valve are installed on the gas transmission pipeline (10).

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