CN115555712A - Sealing device and method for metal double-layer vacuum heat-insulation container - Google Patents

Abstract

The invention provides a sealing device and a method for a metal double-layer vacuum heat-insulation container, wherein the device comprises an equipment base, a vacuum cover, a vacuum system, a welding system and a welding gun motion system, wherein the equipment base is provided with a fixed structure, the double-layer vacuum container is inverted, and the fixed structure is connected with an opening of the double-layer vacuum container; a circular hole is formed in the outer shell at the bottom of the double-layer vacuum container, and a wafer is placed in the circular hole; the vacuum cover covers the area to be welded on the outer shell at the bottom of the double-layer vacuum container, and the circular hole and the wafer are arranged in the vacuum cover; the vacuum system is connected with the vacuum cover and is used for vacuumizing the inside of the vacuum cover and the gap between the circular hole and the wafer; the welding system is arranged outside the vacuum cover and is used for carrying out vacuum welding on the welding seams between the circular sheets and the circular holes; and the welding gun motion system is connected with the welding system and used for supporting and fixing the welding system and realizing the motion of the welding system. The invention adopts vacuum welding, and has the advantages of compact welding line, no air hole, good sealing effect, durability, stability, high production efficiency and the like.

Description

A sealing device and method for a metal double-layer vacuum insulation container

technical field

The invention relates to the technical field of manufacturing vacuum heat preservation containers, in particular to a sealing device and method for a metal double-layer vacuum heat preservation container.

Background technique

The metal double-layer vacuum insulation container refers to a container made of metal, which is composed of inner and outer double layers, with a vacuum between the inner and outer layers, and has the function of heat preservation. There are three ways of heat transfer: heat conduction, convection, and radiation. Setting the inner and outer layer structures and vacuuming between the layers can cut off heat conduction and convection. If the metal surface is bright and the radiation is reflected, the heat transfer effect will be weak, so that the objects in the inner container will be in a state of close to heat insulation. The vacuum insulated cup holding hot water is such a container, but the metal double-layer vacuum insulated container is not only a thermos cup (and a braised beaker), but also a vacuum insulated barrel for the food processing industry, a thermos pot with a built-in electric heating tube, and a chemical industry. Various industrial insulation containers used to store high-temperature or low-temperature objects in the , medicine, and food industries.

In order to obtain good thermal insulation performance, it is necessary to ensure that the vacuum state between the inner and outer layers of the container is good. There are several ways to obtain the vacuum state between the inner and outer layers: (1) Set a small hole at the bottom of the outer layer and weld a thin tube. Vacuum, and then seal the thin tube by welding; (2) Set a small hole at the bottom of the outer layer, first complete the welding of the inner and outer layers in a non-vacuum environment, and then put the container bottom up into the vacuum furnace, near the small hole Place the hot melt adhesive, vacuumize it, heat it to the melting temperature of the adhesive, make it flow and fill the small hole, and seal the space between the inner and outer layers after cooling. This method is called "endless sealing" because it does not involve the above thin tube; (3) Assemble the inner and outer layers, coat the brazing material, and carry out vacuum brazing in a vacuum furnace. After the weld seam is cooled and solidified, the layer The interspace is isolated from the outside world and kept in a vacuum state. Among the above three methods, the narrow tube suction and sealing method will leave a section of thin tube at the bottom of the container, and a bottom bracket needs to be installed at the bottom of the container to flatten the bottom of the container for standing upright, and at the same time cover the remaining thin tube to make it more stable. Beautiful; the hot melt adhesive sealing method is the most commonly used method for small thermal insulation containers, usually tens to hundreds of containers are sealed in a vacuum furnace at the same time, the heating temperature is lower (about 200 ° C), and its production efficiency is lower than that of thin tube suction sealing The method is high, but the sealing part often leaks air gradually, and a bottom support is also required; the vacuum brazing method has a good sealing effect and a beautiful weld shape, but the brazing temperature is high, the production efficiency is very low, and the production cost is high. Generally speaking, all existing methods have the problem of insufficient production efficiency.

Therefore, the present invention proposes a new method and device for sealing a metal double-layer vacuum insulation container. While obtaining good sealing performance, the sealing position of the container is guaranteed to be beautiful, and the method has high production efficiency.

Contents of the invention

According to the technical problem that the production efficiency is not high enough in the various existing methods proposed above, a sealing device and method for a metal double-layer vacuum insulation container are provided. The invention mainly uses a vacuum device to remove the air in the interlayer through the gap between the pre-opened round hole and the disc to make it reach a vacuum state. Then, vacuum laser welding is used to complete the welding of the wafer and the round hole, and the sealing is realized while keeping the interlayer space in a vacuum state. Thus, after the welding is completed, the interlayer remains in a permanently sealed vacuum state.

The technical means adopted in the present invention are as follows:

A sealing device for a metal double-layer vacuum insulation container, comprising: an equipment base, a vacuum cover, a vacuum system, a welding system and a welding torch movement system, the equipment base is provided with a fixed structure, the double-layer vacuum container is inverted, and the double-layer vacuum container The bottom of the double-layer vacuum container is located above the opening, and the fixed structure is connected to the opening of the double-layer vacuum container for positioning and fixing the double-layer vacuum container; a circular hole is opened on the outer shell at the bottom of the double-layer vacuum container , a disc is placed in the round hole; the vacuum cover covers the area to be welded on the bottom outer shell of the double-layer vacuum container, the round hole and the disc are placed inside the vacuum cover, and the vacuum cover is used to provide a vacuum seal environment; the vacuum system is connected to the vacuum cover for vacuuming the inside of the vacuum cover and the gap between the round hole and the disc; the welding system is arranged outside the vacuum cover for vacuuming the gap between the disc and the round hole The welding seam is vacuum welded; the welding torch movement system is connected with the welding system, and is used to support and fix the welding system and realize the movement of the welding system.

Further, the fixing structure is an annular groove provided on the upper surface of the equipment base, and the opening of the double-layer vacuum container is inserted into the annular groove, and the size of the annular groove is consistent with that of the opening of the double-layer vacuum container.

Further, a sealing ring is provided between the vacuum cover and the outer shell at the bottom of the double-layer vacuum container to achieve sealing; the side of the vacuum cover is equipped with a suction port, which is connected to an external suction pipe, and the vacuum system passes through The exhaust pipe and the exhaust port are connected with the vacuum cover.

Further, the vacuum cover is a cylindrical metal vacuum cover, which is away from the upper opening of the double-layer vacuum container, and quartz glass is installed at the opening position; the quartz glass and the vacuum cover are fixedly connected by flanges and bolts, And the joint is provided with a sealing ring to realize sealing.

Further, the vacuum system includes a vacuum pump group, pipelines, valves and a vacuum degree detection system, the vacuum pump group is connected to the suction port through a suction pipe, the valve is installed on the suction pipe, and the vacuum degree detection system is connected to the inside of the vacuum cover for Measure the vacuum inside the vacuum hood;

The vacuum pump group is a secondary vacuum pump group, and the secondary vacuum pump group is composed of a mechanical vacuum pump and a diffusion pump, or is composed of a mechanical vacuum pump and a molecular pump; the vacuum pumps are connected by pipelines;

The vacuum detection system includes a connected vacuum gauge and a vacuum gauge, and the interface of the vacuum gauge is connected to the suction port for measuring the vacuum degree in the vacuum cover, and transmitting the measured vacuum degree value to the vacuum gauge for display ;

The valve includes an air extraction valve and an air release valve; when air is drawn, the air extraction valve is opened and the air release valve is closed; when the air release valve is opened, the vacuum cover is deflated.

Further, the welding system includes a laser, an optical fiber, a laser welding torch and a control system, the control system is connected with the laser to realize the operation of the laser; the laser is used to generate a laser beam, and is connected to the laser welding torch through an optical fiber; The laser welding torch is used to irradiate the laser beam to the quartz glass and pass through the quartz glass to align the welding seam; the laser is a fiber-optic or disk-type laser.

Further, the welding torch movement system uses a robot or a truss-type movement mechanism to clamp the laser welding torch so that the laser welding torch is placed vertically.

Further, the welding torch movement system drives the laser welding torch to make a circular motion along a preset track during welding.

Further, the diameter of the round hole is 5-30mm, and the tolerance is 0-0.02mm; the tolerance of the disc is -0.02-0mm; the diameter and material of the disc and the round hole are the same, and the thickness of the disc is Less than or equal to the thickness of the bottom outer metal shell of the double-layer vacuum container.

The present invention also provides a sealing method for a sealing device of a metal double-layer vacuum insulation container, comprising the following steps:

Step 1. Preparation before welding: use laser cutting and drilling methods to open a round hole on the bottom outer shell of the double-layer vacuum container, the diameter of the round hole is 5-30mm, and the tolerance is 0-0.02mm; use laser, Plasma cutting or punching prepares discs with the same diameter, same material, and thickness less than or equal to the thickness of the outer metal shell of the container; when the raw material of the disc is thicker, the surface can be processed by a lathe, and the tolerance of the disc is -0.02-0mm; Absolute ethanol or acetone to remove organic dirt on the surface of the disc and the round hole;

Step 2, spot fixing: place the disc in the round hole, and fix the two by spot welding by argon arc welding or laser welding; the argon arc welding current is 70-150A, and the laser welding power is 600-2000W;

Step 3. Vacuuming: Turn the double-layer vacuum container upside down, place the bottom of the double-layer vacuum container upwards; cover the area to be welded at the bottom of the double-layer vacuum container with a vacuum cover, and make it close to the bottom; open the vacuum system and pump air Valve, start vacuuming the vacuum cover until the vacuum degree is ≤0.0067Pa;

Step 4. Welding: According to the thickness and material properties of the outer layer metal or disc of the container, set the laser welding parameters, the speed and trajectory of the welding torch motion system, and start welding to penetrate or close to the penetration without damaging the vacuum container. Layer metal is the principle; setting of laser welding parameters and welding torch movement speed: laser power is 600-5000W, movement speed is 10-100mm/s, defocus amount -3mm～3mm, among them, when the focus position is on the surface of the material, the defocus The amount is 0, when it is above the surface of the material, the defocus amount is a positive value, otherwise it is a negative value;

Step 5. Vacuum breaking: After the welding is completed, close the exhaust valve, open the air release valve, destroy the vacuum state in the vacuum cover, and separate the vacuum cover from the double-layer vacuum container;

Step 6. Post-processing: use grinding wheel and cloth wheel to grind and polish the weld seam to make it smoother; when the outer metal shell of the container is thicker and there are "arc craters" after welding, use argon arc welding wire filling or laser filling The wire welding method, after filling the pit, grinds and polishes the weld seam.

Compared with the prior art, the present invention has the following advantages:

The sealing device and method of the metal double-layer vacuum heat preservation container provided by the invention adopts vacuum welding, and the welding seam is dense and has no pores, and the sealing effect is good and durable and stable. high productivity. Compared with vacuum brazing method and hot melt adhesive method, no heating is required and energy saving is achieved. Compared with the hot-melt adhesive method and the "tailpipe" method, there is no need for a cover and a protective bottom bracket, which saves material, reduces weight, and is more aesthetically pleasing. Vacuum laser welding can achieve greater penetration, even for thick-walled cylinders (thicker inner and outer layers of the container).

To sum up, applying the technical solution of the present invention can solve the problem of insufficient production efficiency existing in various existing methods.

Based on the above reasons, the present invention can be widely promoted in fields such as the manufacture of vacuum insulation containers.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained according to these drawings without any creative effort.

Fig. 1 is a structural schematic diagram of the device of the present invention.

Fig. 2 is a schematic diagram of the welding sealing position of the double-layer vacuum insulation container of the present invention.

In the figure: 1. Equipment base; 2. Vacuum cover; 3. Air extraction port; 4. Sealing ring; 5. Work piece; 6. Welding seam; 7. Laser beam; 8. Quartz glass; 9. Laser welding torch; 10. Container The outer wall; 11, the inner wall of the container; 12, the disc.

detailed description

It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and examples.

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is only some embodiments of the present invention, but not all embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and in no way taken as limiting the invention, its application or uses. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

It should be noted that the terminology used here is only for describing specific embodiments, and is not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural, and it should also be understood that when the terms "comprising" and/or "comprising" are used in this specification, they mean There are features, steps, operations, means, components and/or combinations thereof.

The relative arrangements of components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. At the same time, it should be clear that, for the convenience of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. Techniques, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the authorized description. In all examples shown and discussed herein, any specific values should be construed as exemplary only, and not as limitations. Therefore, other examples of the exemplary embodiment may have different values. It should be noted that like numerals and letters denote like items in the following figures, therefore, once an item is defined in one figure, it does not require further discussion in subsequent figures.

As shown in Figure 1, the present invention provides a sealing device and method for a metal double-layer vacuum insulation container, which is a manufacturing method for a vacuum insulation container for production tools or a vacuum insulation container for daily necessities. Metal double-layer vacuum containers are widely used in daily necessities, food, medicine, chemical industry and other fields. In its manufacturing process, in order to realize the vacuum sealing of the interlayer, methods such as hot melt adhesive vacuum heating sealing, vacuum brazing, vacuuming with tailpipe-tailpipe welding, etc. are usually used. The invention proposes a new sealing method to realize sealing welding with higher efficiency, better quality and more beautiful appearance. The invention has innovation and practicability, and has certain popularization value. The present invention is expected to be popularized within the company and at home and abroad.

The sealing device of the metal double-layer vacuum insulation container includes:

(1) The equipment base 1 is provided with an annular groove consistent with the size of the workpiece 5 (the double-layer vacuum insulation container to be welded) on the upper surface of the equipment base, for positioning and fixing of the double-layer vacuum container. Specifically, the double-layer vacuum container is turned upside down, the bottom of the double-layer vacuum container is located above the opening (that is, the opening is located below, and the bottom is located above), the annular groove is clamped and connected to the opening of the double-layer vacuum container, and the double-layer vacuum container The opening is inserted into the annular groove. A round hole is provided on the outer casing at the bottom of the double-layer vacuum container above, and a disc 12 is placed in the round hole. As shown in Figure 2, the shell of the double-layer vacuum container is made up of container outer wall 10 and container inner wall 11, and circular hole is opened at the bottom of container outer wall, forms welding seam 6 (being a circle annular welding seam) between circular hole and disc . The diameter of the round hole is 5-30mm, the tolerance is 0-0.02mm; the tolerance of the disc is -0.02-0mm; the diameter and material of the disc and the round hole are the same, and the thickness of the disc is less than or equal to the bottom of the double-layer vacuum container outer shell thickness.

(2) The vacuum cover 2 and the vacuum system include a cylindrical metal vacuum cover. The vacuum cover covers the area to be welded on the bottom outer shell of the double-layer vacuum container, and the vacuum cover and the bottom outer shell of the double-layer vacuum container are sealed by a sealing ring. The round holes and discs are placed inside the vacuum cover, and the vacuum The hood is used to provide a vacuum-tight environment. The vacuum system is connected with the vacuum cover, and is used for vacuuming the inside of the vacuum cover and the gap between the round hole and the wafer. The upper part of the vacuum cover is perforated, and quartz glass 8 is installed at the position of the perforation. The connection between the quartz glass and the metal vacuum cover is fixed by flanges and bolts, and the connection is sealed with a sealing ring. An air extraction port 3 (vacuum air extraction port) is installed on the side of the vacuum cover, and the air extraction port is connected with the air extraction pipe. The vacuum system is connected with the vacuum hood through the suction pipe and the suction port. The vacuum system is mainly composed of a vacuum pump group, pipelines, valves and a vacuum degree detection system. The vacuum pump group is connected to the suction port through a suction pipe, the valve is installed on the suction pipe, and the vacuum degree detection system is connected to the inside of the vacuum cover to measure the vacuum cover. internal vacuum. The vacuum pump set is a secondary vacuum pump set consisting of a mechanical vacuum pump and a diffusion pump or molecular pump. Preferably, a secondary pump group consisting of a mechanical vacuum pump and a molecular pump is selected. The vacuum pumps are connected by pipelines. The vacuum detection system includes a vacuum gauge and a vacuum gauge. The interface of the vacuum gauge is connected to the suction port for measuring the vacuum degree in the vacuum cover, and the measured vacuum value is transmitted to the vacuum gauge for display. An air extraction valve and an air release valve are arranged on the air extraction pipe; during air extraction, the air extraction valve is opened and the air release valve is closed, and when the air release valve is opened, the vacuum cover is released.

(4) The welding system is arranged outside the vacuum cover and is used for vacuum welding the weld between the wafer and the round hole. The welding system includes laser, optical fiber, laser welding torch 9 and its control system. The control system is connected with the laser to realize the operation of the laser; the laser is used to generate the laser beam 7 and is connected to the laser welding torch through an optical fiber; the laser is a fiber-optic or disc-type laser.

(5) Welding torch motion system, connected with the welding system, is used to support and fix the welding system and realize the movement of the welding system. The welding torch movement system uses a robot or a truss-type movement mechanism to clamp the laser welding torch, place the laser welding torch vertically, irradiate the laser beam to the quartz glass and pass through the quartz glass, align the welding seam, and drive the welding torch along the preset track during welding Make a circular motion.

The sealing method of the metal double-layer vacuum insulation container adopting the device comprises the following steps:

Step 1. Preparation before welding: use the method of laser cutting + drilling to open a round hole at the bottom of the outer layer of the double-layer vacuum container. The diameter of the round hole is 5-30mm, and the tolerance is 0-0.02mm. Laser or plasma cutting or punching is used to prepare discs with the same diameter, the same material, and a thickness less than or equal to the thickness of the outer metal of the container. When the material is thick, the surface can be processed by lathe. The wafer tolerance is -0.02-0mm. Use absolute ethanol or acetone to remove organic dirt on the surface of the disc and the round hole.

Step 2, spot fixing: place the disc in the round hole, and fix the two by spot welding by argon arc welding or laser welding. Argon arc welding current 70-150A. Laser welding power 600-2000W.

Step 3. Vacuuming: Place the vacuum insulation container with the bottom up. Cover the area to be welded at the bottom of the vacuum container with the above-mentioned vacuum cover, and make it close to the bottom. Open the vacuum system and pumping valve, and start vacuuming until the vacuum degree is ≤0.0067Pa.

Step 4. Welding: According to the thickness and material properties of the outer metal or disc of the container, set the laser welding parameters, the moving speed and the moving track of the welding torch movement mechanism, and start welding. Setting of laser welding parameters and welding gun movement speed: laser power is 600-5000W, defocus amount -3mm~3mm (when the focus position is on the surface of the material, the defocus amount is 0, and when it is above the material surface, the defocus amount is positive value, otherwise negative value), the movement speed is 10-100mm/s. The principle is to penetrate or close to penetration without damaging the inner metal of the vacuum vessel.

Step 5. Break the vacuum: After the welding is completed, close the exhaust valve and open the air release valve to destroy the vacuum state in the vacuum cover. Separate the vacuum hood and vacuum container.

Step 6, post-processing: use grinding wheel and cloth wheel to grind and polish the weld seam to make it smoother. When the metal on the outer layer of the container is thick and there is an "arc crater" after welding (there is a pit at the end point of laser welding), use argon arc welding wire filling or laser wire filling welding to fill the pit and then grind and polish it. welds.

The principle of the invention is to remove the air in the interlayer through the gap between the pre-opened round hole and the disc through the vacuum device, so as to make it reach a vacuum state. Then, vacuum laser welding is used to complete the welding of the wafer and the round hole, and the sealing is realized while keeping the interlayer space in a vacuum state. Thus, after the welding is completed, the interlayer remains in a permanently sealed vacuum state.

Benefits of the present invention: (1) Vacuum welding, its weld seam is dense, without pores, good sealing effect, durable and stable; (2) High production efficiency (3) Compared with vacuum brazing method and hot melt adhesive method, no heating is required , energy saving (4) Compared with the hot melt adhesive method and the "tail pipe" method, there is no need for a cover and a protective bottom bracket, which saves materials, reduces weight, and is more beautiful; (5) Vacuum laser welding can obtain larger The penetration depth is applicable even for thick-walled cylinders (thick inner and outer layers of the container).

Example 1

The device and method proposed by the invention are used to seal the SUS 304 stainless steel double-layer vacuum insulation cup.

First, laser cutting is used to cut a round hole at the bottom of the outer layer of the stainless steel thermos cup, and then a 10mm drill bit is used on a drilling machine to process the round hole so that it has a higher precision and a smoother surface. The diameter of the round hole is 20mm. Use laser cutting to prepare a disc with a diameter of 10mm, the same material, and a thickness equal to the thickness of the outer metal of the thermos cup (0.6mm). Use absolute ethanol to remove organic dirt on the surface of the disk and the round hole. Place the disc in the round hole. At this time, the gap is about 0-0.02mm. The two are fixed by spot welding by laser welding. The laser welding power is 600W; three welding spots are spot-welded equidistantly along the circumference, and the distance between adjacent welding spots is one-third of the circle. Place the vacuum mug bottom up with the vacuum hood on top. Apply a little pressure to fit the vacuum cover seal to the bottom of the mug. Open the vacuum system and pumping valve, and start vacuuming until the vacuum degree is lower than 0.0067Pa. Set the laser welding parameters and the movement speed of the welding torch movement mechanism as follows: laser power 600W, defocus amount 0, welding torch movement speed 20mm/s. The trajectory of the welding torch is set to move at a uniform speed along the circumference through robot teaching. Start soldering. After the welding is completed, close the exhaust valve, open the vent valve, and destroy the vacuum state in the vacuum cover. Separate the vacuum hood and vacuum container. Check the weld seam and find that the weld seam is complete and has no obvious defects. Use grinding wheel and cloth wheel to grind and polish the weld to make it smoother and more beautiful.

Example 2

The device and method proposed by the invention are used to seal the 6061 aluminum alloy double-layer vacuum insulation barrel.

Firstly, a laser cutting method is used to cut a circular hole at the bottom of the outer layer of the double-layer thermal insulation bucket. Then use a 20mm drill bit on the drill press to process the round hole so that it has a higher precision and a smoother surface. The diameter of the round hole is 20mm. Cut the material with plasma, and prepare a disc with a diameter of 20mm, the same material, and a thickness equal to the metal thickness (6mm) of the outer layer of the thermal insulation barrel. It is machined on a lathe for higher precision and a smoother surface. Use absolute ethanol to remove organic dirt on the surface of the disk and the round hole. Place the disc in the round hole. At this time, the gap is about 0-0.02mm. The two are fixed by spot welding by means of argon arc welding. Argon arc welding current 150A, manual spot welding. Spot weld three welding spots equidistant along the circumference, and the distance between adjacent welding spots is one-third of the circumference. Place the vacuum container bottom up and place the vacuum hood over it. Apply a little pressure to fit the vacuum hood seal to the bottom of the jar. Open the vacuum system and pumping valve, and start vacuuming until the vacuum degree is lower than 0.0067Pa. Set the laser welding parameters and the movement speed of the welding torch movement mechanism as follows: laser power 3000W, defocus amount -3mm, welding torch movement speed 50mm/s. The trajectory of the welding torch is set to move at a uniform speed along the circumference through robot teaching. Start soldering. After the welding is completed, close the exhaust valve, open the vent valve, and destroy the vacuum state in the vacuum cover. Separate the vacuum hood and vacuum container. Check the weld seam and find that the weld seam is complete and has no obvious defects except for the arc-stop point (end of welding). Manual argon arc welding is used, and the arc-stop point is filled with wire for repair welding. The welding wire is aluminum welding wire with a diameter of 1.2mm, and the argon arc welding current is 150A. Use grinding wheel and cloth wheel to grind and polish the weld to make it smoother and more beautiful.

Example 3

The device and method proposed by the invention are used to seal the TC4 titanium alloy double-layer vacuum insulation barrel.

Firstly, a laser cutting method is used to cut a circular hole at the bottom of the outer layer of the double-layer thermal insulation bucket. Then use a 20mm drill bit on the drill press to process the round hole so that it has a higher precision and a smoother surface. The diameter of the round hole is 20mm. Laser cutting is used to prepare a disc with a diameter of 20mm, the same material, and a thickness equal to the thickness of the outer metal of the thermal insulation barrel (4mm). It is machined on a lathe for higher precision and a smoother surface. Use absolute ethanol to remove organic dirt on the surface of the disk and the round hole. Place the disc in the round hole. At this time, the gap is about 0-0.01mm. The two are fixed by spot welding by means of argon arc welding. Argon arc welding current 120A, manual spot welding. Spot weld three welding spots equidistant along the circumference, and the distance between adjacent welding spots is one-third of the circumference. Place the vacuum container bottom up and place the vacuum hood over it. Apply a little pressure to fit the vacuum cover seal to the bottom of the mug. Open the vacuum system and pumping valve, and start vacuuming until the vacuum degree is lower than 0.0067Pa. Set the laser welding parameters and the movement speed of the welding torch movement mechanism as follows: laser power 2000W, defocus amount 2mm, welding torch movement speed 60mm/s. The trajectory of the welding torch is set to move at a uniform speed along the circumference through robot teaching. Start soldering. After the welding is completed, close the exhaust valve, open the vent valve, and destroy the vacuum state in the vacuum cover. Separate the vacuum hood and vacuum container. Check the weld seam and find that the weld seam is complete and has no obvious defects except for the arc-stop point (end of welding). Manual argon arc welding is used, and the arc-stop point is filled with wire for repair welding. The welding wire is TA2 titanium welding wire with a diameter of 2.0mm, and the argon arc welding current is 120A. Use grinding wheel and cloth wheel to grind and polish the weld to make it smoother and more beautiful.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the various embodiments of the present invention. scope.

Claims (10)

1. a sealing device for a metal double-layer vacuum insulation container, characterized in that it comprises: an equipment base (1), a vacuum cover (2), a vacuum system, a welding system and a welding torch motion system, on the equipment base (1) A fixed structure is provided, the double-layer vacuum container is inverted, the bottom of the double-layer vacuum container is located above the opening, the fixed structure is connected to the opening of the double-layer vacuum container, and is used to realize the positioning and fixing of the double-layer vacuum container; The outer shell at the bottom of the double-layer vacuum container is provided with a round hole, and a disc (12) is placed in the round hole; the vacuum cover (2) covers the area to be welded on the outer shell at the bottom of the double-layer vacuum container , circular holes and discs (12) are placed inside the vacuum cover (2), and the vacuum cover (2) is used to provide a vacuum-tight environment; the vacuum system is connected with the vacuum cover (2) for the vacuum cover (2). 2) Vacuumize the inside and the gap between the round hole and the disc; the welding system is arranged outside the vacuum cover (2) for vacuuming the weld (6) between the disc (12) and the round hole Welding: the welding torch movement system is connected with the welding system, and is used to support and fix the welding system and realize the movement of the welding system. 2. The sealing device of the metal double-layer vacuum insulated container according to claim 1, wherein the fixed structure is an annular groove provided on the upper surface of the equipment base (1), and the opening of the double-layer vacuum container is inserted into the In the annular groove, the size of the annular groove is consistent with the opening of the double-layer vacuum container. 3. The sealing device of the metal double-layer vacuum insulated container according to claim 1, wherein a sealing ring (4) is set between the vacuum cover (2) and the outer shell at the bottom of the double-layer vacuum container to realize sealing The side of the vacuum cover (2) is equipped with a suction port (3), and the suction port (3) is connected with an external suction pipe, and the vacuum system is connected with the vacuum cover (2) through the suction pipe and the suction port (3) . 4. according to the sealing device of claim 1 or 3 described metal double-layer vacuum insulation container, it is characterized in that, described vacuum cover (2) is cylindrical metal vacuum cover, and it is away from the upper opening of double-layer vacuum container, And the quartz glass (8) is installed at the opening position; the quartz glass (8) and the vacuum cover (2) are fixedly connected by flanges and bolts, and a sealing ring is arranged at the joint to realize sealing. 5. the sealing device of metal double-layer vacuum insulated container according to claim 3, is characterized in that, described vacuum system comprises vacuum pump group, pipeline, valve and vacuum degree detection system, and vacuum pump group passes through air extraction pipe and air extraction port ( 3) connected, the valve is installed on the exhaust pipe, the vacuum degree detection system is connected with the inside of the vacuum cover (2), and is used to measure the vacuum degree inside the vacuum cover (2); The vacuum pump group is a secondary vacuum pump group, and the secondary vacuum pump group is composed of a mechanical vacuum pump and a diffusion pump, or is composed of a mechanical vacuum pump and a molecular pump; the vacuum pumps are connected by pipelines; The vacuum detection system includes a connected vacuum gauge and a vacuum gauge, and the interface of the vacuum gauge is connected to the air inlet (3) for measuring the vacuum in the vacuum cover (2), and the measured vacuum value Pass it to the vacuum gauge for display; The valve includes an air extraction valve and an air release valve; during air extraction, the air extraction valve is opened and the air release valve is closed; when the air release valve is opened, the vacuum cover (2) is released. 6. the sealing device of metal double-layer vacuum insulation container according to claim 4, is characterized in that, described welding system comprises laser device, optical fiber, laser torch (9) and control system, and described control system links to each other with laser device, uses To realize the operation of the laser; the laser is used to generate the laser beam (7), connected to the laser welding torch (9) through the optical fiber; the laser welding torch (9) is used to irradiate the laser beam (7) to the quartz glass (8) And through the quartz glass (8), aim at the welding seam (6); the laser is an optical fiber or disk laser. 7. The sealing device of the metal double-layer vacuum insulated container according to claim 6, wherein the welding torch motion system adopts a robot or a truss type motion mechanism to clamp the laser welding torch (9), so that the laser welding torch (9) Stand vertically. 8. The sealing device of the metal double-layer vacuum insulation container according to claim 7, characterized in that, the welding torch movement system drives the laser welding torch (9) to make a circular motion along a preset track during welding. 9. The sealing device of the metal double-layer vacuum insulation container according to claim 1, characterized in that, the diameter of the circular hole is 5-30mm, and the tolerance is 0-0.02mm; the tolerance of the disc (12) -0.02-0mm; the disc (12) has the same diameter and material as the round hole, and the thickness of the disc (12) is less than or equal to the thickness of the bottom outer shell of the double-layer vacuum container. 10. A sealing method for the sealing device of the metal double-layer vacuum insulation container according to any one of claims 1-9, characterized in that it comprises the following steps: Step 1. Preparation before welding: use laser cutting and drilling methods to open a round hole on the bottom outer shell of the double-layer vacuum container, the diameter of the round hole is 5-30mm, and the tolerance is 0-0.02mm; use laser, Plasma cutting or punching prepares the disc (12) with the same diameter, the same material, and thickness less than or equal to the thickness of the outer metal shell of the container; when the raw material of the disc (12) is thick, the surface of the disc (12) can be processed by a lathe ) tolerance is -0.02-0mm; use absolute ethanol or acetone to remove the organic dirt on the surface of the disc (12) and the round hole; Step 2, spot fixing: place the disc (12) in the round hole, and fix the two by spot welding by argon arc welding or laser welding; the argon arc welding current is 70-150A, and the laser welding power is 600-2000W; Step 3. Vacuuming: Turn the double-layer vacuum container upside down, place the bottom of the double-layer vacuum container upwards; cover the area to be welded at the bottom of the double-layer vacuum container with the vacuum cover (2), and make it close to the bottom; open the vacuum system and exhaust valve, start vacuuming the vacuum cover (2) until the vacuum degree is ≤0.0067Pa; Step 4. Welding: According to the thickness and material properties of the outer layer metal or disc (12) of the container, set the laser welding parameters, the moving speed and the moving track of the welding torch motion system, and start welding to penetrate or close to the penetration without damaging The principle is the inner metal of the vacuum vessel; the setting of the laser welding parameters and the moving speed of the welding torch: the laser power is 600-5000W, the moving speed is 10-100mm/s, and the defocus amount is -3mm~3mm. Among them, when the focus position is on the surface of the material , the defocus amount is 0, when it is above the material surface, the defocus amount is a positive value, otherwise it is a negative value; Step 5, vacuum breaking: after the welding is completed, close the pumping valve, open the venting valve, destroy the vacuum state in the vacuum cover (2), and separate the vacuum cover (2) from the double-layer vacuum container; Step 6. Post-processing: use grinding wheel and cloth wheel to grind and polish the weld seam (6) to make it smoother; when the outer metal shell of the container is thicker and there are "arc craters" after welding, use argon arc welding to fill the wire Or the method of laser wire-filling welding, after filling the pit, grind and polish the weld seam (6).

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