Flame welding machine, welding method for gas pipe and liquid storage tank body and compressor

Abstract

The present application relates to flame brazing equipment technical field, specifically relates to a kind of flame welding machine, gas pipe and the welding method of liquid storage tank body and compressor.Flame welding machine includes rack, first brazing device, solder placement device, second brazing device and several positioning tooling;Rack is equipped with station disc and splitter;Several positioning tooling is arranged on station disc;First brazing device and second brazing device are both located outside station disc, and are arranged in turn along the rotation direction of station disc, and first brazing device and second brazing device are respectively corresponding with the position of two adjacent positioning tooling;Lifting control member that first brazing device is equipped with drive positioning tooling loose to workpiece clamping;Solder placement device is located outside second brazing device, and is installed on rack.Welding method of gas pipe and liquid storage tank body, including the preheating of gas pipe.Compressor, including the assembly made of above-mentioned welding method of gas pipe and liquid storage tank body.

Description

Technical Field

[0001] This invention relates to the field of flame brazing equipment technology, specifically to a flame welding machine, a welding method for gas pipes and liquid storage tanks, and a compressor. Background Technology

[0002] Flame brazing is a brazing process that uses a flame generated by the combustion of a combustible gas mixed with oxygen (or compressed air) for heating. It is divided into flame brazing (hard brazing) and flame brazing (soft brazing). Flame brazing equipment is simple and easy to operate; multiple flames can be used simultaneously for welding, depending on the shape of the workpiece. This method is suitable for welding small and medium-sized parts such as bicycle and electric vehicle frames, and aluminum kettle spouts.

[0003] Patent CN208879883U discloses an eight-station flip-flame brazing welding device for liquid storage tanks. This device achieves automatic welding of the liquid storage tanks by setting up manual loading, inspection, preheating, heating and welding, flipping preheating, cooling, and unloading stations. Based on the description, it should be understood that the preheating process is used to initially heat the liquid storage tank, thereby shortening the welding time at the heating and welding station and improving welding efficiency. In the prior art, the gas pipes used to connect to the liquid storage tank are often of two types: steel gas pipes made of steel (see patent CN216897931U) and composite gas pipes made of straight steel pipes and copper bends (see patent CN102338517B). Figure 1 This diagram illustrates the connection structure between the steel gas pipe and the liquid storage tank. Due to the obstruction of the liquid storage tank, the burner can only heat the heat transfer section 100 of the steel pipe exposed outside the tank, transferring heat to the contact section 200 where the gas pipe and the liquid storage tank meet. This ensures complete weld penetration and improves weld quality. However, heat loss occurs during this process. Therefore, during processing, the heat in the heat transfer section 100 is significantly greater than that in the contact section 200. Consequently, the heat transfer section 100 is prone to oxidation due to excessive temperature, resulting in a weak bond between the paint and the heat transfer section during painting. (See reference...) Figure 2 This diagram shows the connection structure of a steel straight pipe, a copper bend, and a liquid storage tank. Due to the obstruction of the liquid storage tank, the burner can only heat the top of the copper bend and the steel straight pipe. However, the steel straight pipe has low efficiency in transferring heat downwards. To ensure that the solder melts and penetrates completely, the steel straight pipe needs to be heated for a long time. However, if the flame heating time is too long, the temperature at the copper bend will be too high. This can easily cause changes in the crystal grain size of the copper pipe, which in turn makes the copper pipe prone to breakage and shortens its service life.

[0004] Therefore, it is necessary to provide a technical solution to address the above problems. Summary of the Invention

[0005] This invention provides a flame welding machine, a welding method for gas pipes and liquid storage tanks, and a compressor. It aims to solve the problems that when welding steel pipes to liquid storage tanks, oxide films easily form on the surface of the steel gas pipes, and when welding steel straight pipes, copper bends and liquid storage tanks, the crystal grain size of the copper pipes easily changes, leading to easy breakage of the copper pipes and shortening their service life.

[0006] To achieve the above objectives, the present invention provides a flame welding machine, comprising a frame, a first brazing device, a solder placement device, a second brazing device, and a plurality of positioning fixtures; wherein:

[0007] The frame is equipped with a workstation panel and a divider that drives the workstation panel to rotate.

[0008] Several positioning fixtures are arranged in a circular array on the workstation plate; each positioning fixture includes a bracket, a fixed base, and a lifting base; both the bracket and the fixed base are mounted on the workstation plate; the lifting base is located above the fixed base and is slidably connected to the bracket.

[0009] The first brazing device and the second brazing device are both located outside the workstation and are arranged sequentially along the rotation direction of the workstation. The first brazing device and the second brazing device correspond to the positions of two adjacent positioning fixtures. A lifting control component that drives the lifting seat to move up and down is installed on the first brazing device.

[0010] The solder placement device is located outside the second brazing device and is mounted on the frame.

[0011] More specifically, the first brazing device and the second brazing device have the same structure, both including a movable frame, a welding torch, and a first driving component; the movable frame is slidably connected to the frame; the welding torch is installed on the side of the movable frame near the workstation; the first driving component is installed on the frame and is used to drive the movable frame to move closer to or away from the workstation; the lifting control component is installed on the movable frame of the first brazing device and is used to drive the lifting seat to lift upward when the movable frame moves to the side near the workstation.

[0012] More specifically, the lifting control component includes a triangular top plate; the triangular top plate is fixedly connected to the side of the movable frame near the workstation panel.

[0013] More specifically, a gas guide pipe is installed in the middle of the fixed base, and the gas guide pipe is connected to the nitrogen distributor.

[0014] More specifically, the solder placement device includes a mounting column, a lifting adjustment seat, a rotating adjustment seat, a movable seat, a second driving component, and a feed pipe; the mounting column is mounted on the frame; the lifting adjustment seat is mounted on the mounting column; the rotating adjustment seat is mounted on the lifting adjustment seat; the movable seat is slidably connected to the rotating adjustment seat; the second driving component is mounted on the rotating adjustment seat and is used to drive the movable seat to slide; the feed pipe is mounted on the movable seat.

[0015] More specifically, a cooling device is provided on the outside of the workstation panel; the cooling device is located on the side of the second brazing device away from the first brazing device and is mounted on the frame.

[0016] The technical effects of the flame welding machine involved in this invention are as follows:

[0017] Compared to existing eight-station flip-type flame brazing equipment, this application adds a lifting control component. When the first brazing device is preheating, the lifting control component raises the lifting seat upwards. Adjustments to the lifting control component allow the lifting seat to be raised to different heights, thus preheating the contact area between the steel pipe and the steel straight pipe or the storage tank. This significantly reduces heat loss during the second brazing process. Consequently, when welding the steel pipe to the storage tank, an oxide film is less likely to form on the steel pipe surface, improving the bonding strength between the paint layer and the steel pipe. Furthermore, when welding steel straight pipes, copper bends, and the storage tank, the crystal grain size of the copper pipe is less likely to change, ensuring the strength and toughness of the copper pipe and extending its service life.

[0018] A method for welding a gas pipe to a liquid storage tank, wherein the gas pipe is a steel pipe, and the steel pipe and the liquid storage tank are mounted on the aforementioned flame welding machine for processing; the method includes the following steps:

[0019] S1. Clean the steel pipes and storage tanks to remove surface oil, rust, and other defects, and then dry them.

[0020] S2. Fix the steel pipe to the lifting seat and the liquid storage tank to the fixed seat, and align the steel pipe and the liquid storage tank.

[0021] S3. The divider drives the workstation plate to rotate, so that the positioning fixture holding the steel pipe and the liquid storage tank moves to the processing area of ​​the first brazing device.

[0022] S4. The lifting seat is moved upward by 5-8mm by the lifting control component, and the steel pipe is preheated by the first brazing device.

[0023] S5. After the preheating work is completed, the lifting control component removes the control of the lifting seat, so that the lifting seat is reset. Then the divider drives the workstation plate to rotate, so that the positioning fixture originally located in the processing area of ​​the first brazing device is moved to the processing area of ​​the second brazing device.

[0024] S6. The solder is filled into the gap between the steel pipe and the liquid storage tank by the solder placement device, and the connection between the steel pipe and the liquid storage tank is heated by the second brazing device.

[0025] S7. After the solder is completely melted, the divider drives the station plate to rotate, so that the positioning fixture originally located in the processing area of ​​the first brazing device moves to the next station. After the solder cools and solidifies, the steel pipe is fixedly connected to the liquid storage tank to form an assembly.

[0026] S8. Remove the assembly.

[0027] More specifically, in step S4, the preheating time of the first brazing device on the steel pipe is 12s-16s; in step S6, the heating time of the second brazing device at the connection between the steel pipe and the liquid storage tank is 12s-16s.

[0028] The technical advantages of the welding method between the gas pipe and the liquid storage tank involved in this invention are as follows:

[0029] In this application, the positioning fixture holding the steel pipe and the liquid storage tank is located in the processing area of ​​the first brazing device. The steel pipe is lifted 5mm-8mm by the lifting control component, so that the contact part between the steel pipe and the liquid storage tank extends to the outside of the liquid storage tank. This allows the first brazing device to preheat the contact part. In this way, when the second brazing device performs heating and welding, the heat conduction speed of the steel pipe can be effectively improved, the heat dissipation can be reduced, and the heating time required for the heat transfer part can be shortened. This avoids the formation of an oxide film on the surface of the heat transfer part of the steel pipe due to prolonged flame heating.

[0030] A method for welding a gas pipe to a liquid storage tank, the gas pipe comprising a straight steel pipe and a copper bend; the copper bend, the straight steel pipe, and the liquid storage tank are mounted on a flame welding machine for processing; the method includes the following steps:

[0031] S1. Clean the copper bends, steel straight pipes and liquid storage tanks to remove surface oil, rust and other defects, and dry them.

[0032] S2. Fix the copper bend to the lifting seat, install the steel straight pipe into the liquid storage tank, and fix the liquid storage tank to the fixed seat, with the copper bend and the liquid storage tank aligned and fitted.

[0033] S3. The divider drives the workstation plate to rotate, so that the positioning fixture containing the copper bend, steel straight pipe and liquid storage tank moves to the processing area of ​​the first brazing device.

[0034] S4. The lifting seat is moved upward by 20mm-60mm by the lifting control component, and the connection between the steel straight pipe and the liquid storage tank is preheated by the first brazing device.

[0035] S5. After the preheating work is completed, the lifting control component removes the control of the lifting seat, so that the lifting seat is reset. Then the divider drives the workstation plate to rotate, so that the positioning fixture originally located in the processing area of ​​the first brazing device is moved to the processing area of ​​the second brazing device.

[0036] S6. The solder placement device fills the gap between the steel straight pipe and the liquid storage tank and the gap between the steel straight pipe and the copper bend with solder, and the second brazing device heats and melts the solder between the steel straight pipe and the copper bend and the solder between the steel straight pipe and the liquid storage tank.

[0037] S7. After the solder is completely melted, the divider drives the station plate to rotate, so that the positioning fixture originally located in the processing area of ​​the second brazing device moves to the next station. After the solder cools and solidifies, the steel straight pipe is fixedly connected to the liquid storage tank to form an assembly.

[0038] S8. Remove the assembly.

[0039] More specifically, in step S4, the preheating time of the first brazing device at the connection between the steel straight pipe and the liquid storage tank is 12s-16s; in step S6, the heating and melting time of the weld between the steel straight pipe and the copper bend and between the steel straight pipe and the liquid storage tank by the second brazing device is 12s-16s.

[0040] The technical advantages of the welding method between the gas pipe and the liquid storage tank involved in this invention are as follows:

[0041] In this application, a positioning fixture holding the copper bend and the liquid storage tank is located in the processing area of ​​the first brazing device. The copper bend is lifted 30mm-50mm by a lifting control component, thus moving the copper bend away from the liquid storage tank and the steel straight pipe. This allows the first brazing device to preheat the liquid storage tank and the steel straight pipe. As a result, when the second brazing device performs the heating and welding work, the heat conduction speed of the steel straight pipe can be effectively increased, the heat dissipation can be reduced, and the heating time required for the copper bend can be shortened. This avoids changes in the crystal grain size of the copper bend due to prolonged flame heating, keeps the copper pipe structurally stable, and improves its service life.

[0042] A compressor includes a liquid receiver, the liquid receiver comprising an assembly manufactured by the welding method described above for the gas pipe and the liquid receiver body. Attached Figure Description

[0043] Figure 1 This is a structural diagram of the connection between the steel gas pipe and the liquid storage tank in the existing technology;

[0044] Figure 2A connection structure diagram of steel straight pipes, copper bends and liquid storage tanks in the existing technology;

[0045] Figure 3 This is a top view of a flame welding machine according to the present invention;

[0046] Figure 4 This is a schematic diagram of the structure of a flame welding machine according to the present invention;

[0047] Figure 5 This is a schematic diagram of the structure of the first brazing device in a flame welding machine according to the present invention;

[0048] Figure 6 This is a schematic diagram of the structure of a solder placement device in a flame welding machine according to the present invention;

[0049] Figure 7 This is a schematic diagram of the positioning fixture in a flame welding machine according to the present invention;

[0050] Figure 8 for Figure 7 Enlarged diagram of point A in the middle.

[0051] Marked in the image:

[0052] 1—Frame; 2—First brazing device; 3—Solder placement device; 4—Second brazing device; 5—Positioning fixture; 6—Lifting control component;

[0053] 11—Cylinder;

[0054] 21—Moveable frame; 22—Welding torch; 23—First driving component; 24—Lifting and adjusting mechanism; 241—Guide column; 242—Fixed plate; 243—Adjusting plate; 244—Screw;

[0055] 31—Mounting column; 32—Lifting and adjusting seat; 33—Rotation adjusting seat; 34—Moving seat; 35—Second driving component; 36—Feed pipe; 37—Adjusting block;

[0056] 51—Bracket; 511—Base plate; 512—Top plate; 513—Support column; 514—Rotating wheel; 515—Counterweight; 516—Sliding plate; 517—Abutment column; 52—Fixed seat; 521—Accommodation slot; 522—Lifting plate; 523—Connecting column; 53—Lifting seat; 531—Slider; 532—Limiting rod; 533—Positioning column; 534—Clamping block; 535—Lever;

[0057] 61—Triangular top plate. Detailed Implementation

[0058] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0059] It should be noted that when a component is referred to as "fixed to" or "set on" another component, it can be directly on the other component or there may be an intervening component at the same time; when a component is referred to as "connected to" another component, it can be directly connected to the other component or there may be an intervening component at the same time.

[0060] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0061] In the description of the embodiments of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", and "outer" is based on the orientation or positional relationship shown in the accompanying drawings and is only for the convenience of describing the embodiments of the present invention and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0062] To more clearly illustrate the technical solution of the present invention, the following preferred embodiments are provided.

[0063] Example 1

[0064] A flame welding machine includes a frame 1, a first brazing device 2, a solder placement device 3, a second brazing device 4, and several positioning fixtures 5; wherein:

[0065] The frame 1 is equipped with a workstation panel and a divider that drives the workstation panel to rotate.

[0066] A plurality of positioning fixtures 5 are arranged in a circular array on the workstation plate; each positioning fixture 5 includes a bracket 51, a fixed base 52 and a lifting base 53; both the bracket 51 and the fixed base 52 are mounted on the workstation plate; the lifting base 53 is located above the fixed base 52 and is slidably connected to the bracket 51.

[0067] The first brazing device 2 and the second brazing device 4 are both located outside the workstation and are arranged sequentially along the rotation direction of the workstation. The first brazing device 2 and the second brazing device 4 correspond to the positions of two adjacent positioning fixtures 5 respectively. A lifting control component 6 that drives the lifting seat 53 to move up and down is installed on the first brazing device 2.

[0068] The solder placement device 3 is located outside the second brazing device 4 and is mounted on the frame 1.

[0069] Compared to existing eight-station flip-type flame brazing equipment, the flame welding machine involved in this embodiment adds a lifting control component 6. When the first brazing device 2 is preheating, the lifting control component 6 drives the lifting seat 53 to rise. By adjusting the lifting control component 6, the lifting seat 53 can be raised to different heights, thereby allowing the first brazing device 2 to preheat the contact part 200 of the steel pipe or the straight steel pipe and the liquid storage tank. This significantly reduces heat loss when the second brazing device 4 is heating and welding. As a result, when welding the steel pipe to the liquid storage tank, an oxide film is less likely to form on the surface of the steel pipe, improving the bonding strength between the paint layer and the steel pipe. It also prevents changes in the crystal grain size of the copper pipe during welding of straight steel pipes, copper bends, and the liquid storage tank, ensuring the strength and toughness of the copper pipe and improving its service life.

[0070] As a preferred embodiment, the support 51 includes a base plate 511, a top plate 512, and a plurality of support columns 513; the plurality of support columns 513 are disposed between the base plate 511 and the top plate 512, and their two ends are respectively fixedly connected to the base plate 511 and the top plate 512.

[0071] The lifting seat 53 includes a slider 531, a limiting rod 532, a positioning column 533, a clamping block 534, and a lever 535. The slider 531 is slidably connected to the support column 513. The limiting rod 532 is installed at the bottom of the slider 531. The positioning column 533 is installed on the slider 531. The clamping block 534 is located above the positioning column 533 and is slidably connected to the slider 531, allowing it to slide up and down. The bottom of the clamping block 534 has a clamping groove. The lever 535 is located above the clamping block 534 and is rotatably connected to the slider 531. It is connected to the clamping block 534 through a connecting piece. A rotating wheel 514 is installed on the top plate 512. A counterweight 515 is slidably connected to the support column 513. A transmission rope is connected to the counterweight 515. The transmission rope passes over the rotating wheel 514 and is connected to the slider 531.

[0072] The fixed base 52 has a receiving groove 521 in the middle.

[0073] Specifically, the air tube of the liquid reservoir is sleeved on the outside of the positioning post 533. Then, the operator presses down the lever 535, causing the clamping block 534 to descend and clamp the air tube. Next, the operator lifts the slider 531, placing the liquid reservoir into the receiving groove 521. The slider 531 is then lowered to insert the air tube into the liquid reservoir, completing the assembly. Under gravity, the limiting rod 532 abuts against the base plate 511, thus stably connecting the air tube to the liquid reservoir. It should be noted that the lifting seat 53 is too heavy; therefore, a counterweight 515 is provided to reduce the difficulty for the operator to lift the lifting seat 53.

[0074] Preferably, a sliding plate 516 is slidably connected to the support column 513, and a stop post 517 penetrating the base plate 511 is provided at the bottom of the sliding plate 516; when the slider 531 is not driven by external force, the limiting rod 532 is in contact with the sliding plate 516; a lifting plate 522 is provided in the receiving groove 521 of the fixed seat 52, and a connecting post 523 penetrating the fixed seat 52 is provided at the bottom of the lifting plate 522, and the connecting post 523 is fixedly connected to the sliding plate 516; a cylinder 11 is provided at the liquid storage tank removal station of the flame welding machine, the cylinder 11 is located below the station plate and is installed on the frame 1, and a push plate is installed at its output end. It should be noted that after the liquid storage tank is welded to the gas pipe, its top temperature is too high, and it cannot be guaranteed that the temperature of the top of the liquid storage tank when it is moved to the retrieval position can reach room temperature. Therefore, in this embodiment, the cylinder 11 is used to lift the sliding plate 516 on the positioning fixture 5 that is moved to the retrieval position, so that the liquid storage tank is pushed to the outside of the receiving groove 521 of the fixed seat 52, which makes it easier for the staff to grab the bottom of the storage tank, thereby ensuring that the staff will not be burned and eliminating safety hazards.

[0075] As a preferred embodiment, the first brazing device 2 and the second brazing device 4 have the same structure, both including a movable frame 21, a welding torch 22, and a first driving member 23; the movable frame 21 is slidably connected to the frame 1; the welding torch 22 is installed on the side of the movable frame 21 near the workstation; the first driving member 23 is installed on the frame 1 and is used to drive the movable frame 21 to move closer to or away from the workstation; the lifting control member 6 is installed on the movable frame 21 of the first brazing device 2 and is used to drive the lifting seat 53 to lift upward when the movable frame 21 moves to the side near the workstation. Specifically, when the first brazing device 2 is preheating or the second brazing device 4 is heating and welding, the first driving component 23 drives the movable frame 21 to move towards the side closer to the workstation until the welding torch 22 is distributed outside the welding area corresponding to the liquid reservoir; while when the first brazing device 2 is preheating, the lifting control component 6 drives the lifting seat 53 to rise, so as to control the first brazing device 2 to preheat a specific position.

[0076] In a preferred embodiment, the lifting control component 6 includes a triangular top plate 61; the triangular top plate 61 is fixedly connected to the side of the movable frame 21 near the workstation. When the movable frame 21 moves towards the side near the workstation, the triangular top plate 61 slides accordingly, and supported by the slope of the triangular top plate 61, the lifting seat 53 is lifted upwards, thereby raising the air pipe upwards. It should be noted that the height at which the triangular top plate 61 lifts the lifting seat 53 can be changed by adjusting the position of the triangular top plate 61.

[0077] Preferably, the lifting seat 53 is equipped with pulleys. The pulleys, in cooperation with the triangular top plate 61, improve the smoothness of the control of the lifting seat 53 by the triangular top plate 61, and reduce frictional resistance and wear.

[0078] In a preferred embodiment, a gas guide pipe is installed in the middle of the fixing base 52, and the gas guide pipe is connected to a nitrogen distributor. The nitrogen distributor is used to input nitrogen along the gas guide pipe into the interior of the liquid storage tank, thereby expelling oxygen inside the liquid storage tank and preventing oxidation of the inner surface of the liquid storage tank or the gas pipe due to temperature. Specifically, the flame welding machine consumes 1000 m³ / h-2000 m³ / h of nitrogen during operation.

[0079] In a preferred embodiment, the solder placement device 3 includes a mounting post 31, a lifting adjustment seat 32, a rotating adjustment seat 33, a moving seat 34, a second driving member 35, and a feed pipe 36. The mounting post 31 is mounted on the frame 1. The lifting adjustment seat 32 is mounted on the mounting post 31. The rotating adjustment seat 33 is mounted on the lifting adjustment seat 32. The moving seat 34 is slidably connected to the rotating adjustment seat 33. The second driving member 35 is mounted on the rotating adjustment seat 33 and is used to drive the moving seat 34 to slide. The feed pipe 36 is mounted on the moving seat 34. The feed pipe 36 is connected to an external solder supply device to ensure continuous solder filling. Specifically, the welding positions of liquid reservoirs of different specifications vary when installed on the positioning fixture 5. Therefore, in this embodiment, the lifting adjustment seat 32 and the rotating adjustment seat 33 are added. The height of the feed pipe 36 can be adjusted by the lifting adjustment seat 32, and the feeding angle of the feed pipe 36 can be adjusted by the rotating adjustment seat 33, so that the solder placement device 3 can supply solder for liquid reservoirs of different specifications.

[0080] Preferably, the movable base 34 is provided with an adjusting block 37, which has an arc-shaped hole. The adjusting block 37 is fixed to the movable base 34 by bolts engaging with the arc-shaped hole. The feed pipe 36 is fixedly connected to the adjusting block 37. Specifically, the feed position of the feed pipe 36 in the horizontal direction can be changed by adjusting the relative position of the arc-shaped hole and the bolt to meet the feed requirements of liquid reservoirs of different widths.

[0081] Preferably, a lifting and adjusting mechanism 24 is installed on the movable frame 21; the lifting and adjusting mechanism 24 includes a plurality of guide columns 241, a fixed plate 242, an adjusting plate 243, and a screw 244; the plurality of guide columns 241 are vertically arranged and fixedly connected to the movable frame 21, and the fixed plate 242 is fixedly connected to the top of the plurality of guide columns 241; the adjusting plate 243 is slidably connected to the guide columns 241; the screw 244 is parallel to the guide columns 241, and its two ends are rotatably connected to the fixed plate 242 and the movable frame 21 respectively; the adjusting plate 243 is threadedly connected to the screw 244; an adjusting handwheel is provided above the fixed plate 242, and the adjusting handwheel is fixedly connected to the screw 244; the welding torch 22 is installed on the adjusting plate 243. Specifically, the height of the welding torch 22 can be adjusted by the lifting and adjusting mechanism 24 to meet the welding needs of liquid storage containers of different specifications.

[0082] As a preferred embodiment, a cooling device is also provided on the outside of the workstation panel; the cooling device is located on the side of the second brazing device 4 away from the first brazing device 2 and is mounted on the frame 1. Specifically, the liquid reservoir formed by heating and welding by the second brazing device 4 is driven to the processing area of ​​the cooling device by the divider, and the cooling device sends out cold air to cool the liquid reservoir, shortening the cooling time and making it easier for subsequent workers to remove the liquid reservoir.

[0083] Example 2

[0084] A method for welding a gas pipe to a liquid storage tank, wherein the gas pipe is a steel pipe, and the steel pipe and the liquid storage tank are mounted on the flame welding machine described in Example 1 for processing; the method includes the following steps:

[0085] S1. Clean the steel pipes and storage tanks to remove surface oil, rust, and other defects, and then dry them.

[0086] S2. Fix the steel pipe to the lifting seat 53 and fix the liquid storage tank to the fixing seat 52, and align the steel pipe and the liquid storage tank.

[0087] S3. The divider drives the workstation plate to rotate, so that the positioning fixture 5 holding the steel pipe and the liquid storage tank moves to the processing area of ​​the first brazing device 2.

[0088] S4. The lifting control unit 6 controls the lifting seat 53 to move upward by 5-8mm, and the first brazing device 2 preheats the steel pipe.

[0089] S5. After the preheating work is completed, the lifting control component 6 removes the control over the lifting seat 52, so that the lifting seat 52 is reset. Then, the divider drives the work station plate to rotate, so that the positioning fixture originally located in the processing area of ​​the first brazing device 2 is moved to the processing area of ​​the second brazing device 4.

[0090] S6. The solder is filled into the gap between the steel pipe and the liquid storage tank by the solder placement device 3, and the connection between the steel pipe and the liquid storage tank is heated by the second brazing device.

[0091] S7. After the solder is completely melted, the divider drives the work station plate to rotate, so that the positioning fixture 5, which was originally located in the processing area of ​​the first brazing device 2, enters the next work station. After the solder cools and solidifies, the steel pipe is fixedly connected to the liquid storage tank to form an assembly.

[0092] S8. Remove the assembly.

[0093] In this embodiment, the positioning fixture holding the steel pipe and the liquid storage tank is located in the processing area of ​​the first brazing device 2. The lifting control component 6 drives the steel pipe to be lifted upward by 5mm-8mm, so that the contact part 200 between the steel pipe and the liquid storage tank extends to the outside of the liquid storage tank. This allows the first brazing device 2 to preheat the contact part 200. In this way, when the second brazing device 4 performs heating and welding, the heat conduction speed of the steel pipe can be effectively improved, heat loss can be reduced, and the heating time required for the heat transfer part 100 can be shortened. This avoids the formation of an oxide film on the surface of the heat transfer part 100 of the steel pipe due to prolonged flame heating. It should be noted that when the lifting height of the steel pipe is within the range of 5mm-8mm, the first brazing device 2 can accurately preheat the contact part 200 of the steel pipe. If the lifting height of some steel pipes is outside the above range, the contact part 200 of the steel pipe cannot be fully preheated. Consequently, during the subsequent welding process, the contact part 200 of the steel pipe may only reach the predetermined temperature and achieve complete penetration of the weld bead when the heat transfer part 100 of the steel pipe is heated to the point where an oxide film appears.

[0094] Furthermore, in this embodiment, there is a 2-5 second interval between the preheating in step S4 and the heating and welding in step S6.

[0095] Furthermore, in this embodiment, when the first brazing device 2 preheats the steel pipe, the welding torch 22 is at an angle of 30°-50° to the central axis of the liquid storage tank; when the second brazing device 4 performs heating welding, the welding torch 22 is at an angle of 30°-50° to the central axis of the liquid storage tank. It should be noted that setting the welding torch 22 at the above-mentioned angle allows the flame from the welding torch 22 to be located at the gap between the steel pipe and the liquid storage tank, thus heating and melting the weld material. If the angle between the welding torch 22 and the central axis of the liquid storage tank exceeds the above range, the flame from the welding torch 22 is easily blocked by the liquid storage tank or the gas pipe, causing the weld material to not completely melt and affecting the welding quality.

[0096] Furthermore, in this embodiment, the second brazing device 4 in step S6 heats the steel pipe to 780℃-850℃. It should be noted that if the steel pipe temperature is too low, the solder will not be able to completely melt and penetrate, affecting the welding quality. If the steel pipe temperature is too high, the surface of the steel pipe is prone to melting, or even perforation.

[0097] In a preferred embodiment, the preheating time of the first brazing device 2 on the steel pipe in step S4 is 12s-16s. It should be noted that if the preheating time of the first brazing device 2 on the steel pipe is too short, the steel pipe cannot be preheated to the predetermined temperature. Consequently, when the second brazing device 4 heats the heat transfer part 100 of the steel pipe, the contact part 200 cannot reach the welding temperature, and the solder cannot effectively melt and penetrate, affecting the welding quality. Conversely, if the preheating time of the first brazing device 2 on the steel pipe is too long, the surface of the steel pipe is prone to melting. In step S6, the heating time of the second brazing device 4 at the connection between the steel pipe and the storage tank is 12s-16s. It should be noted that if the heating time of the second brazing device 4 on the steel pipe is too short, the steel pipe cannot be heated to the aforementioned temperature standard. Conversely, if the heating time is too long, the temperature of the steel pipe will be too high, leading to melting of the steel pipe surface.

[0098] To further explain, the second brazing device 4 requires 5-8 seconds to heat and melt the welding wire. It should be noted that if the heating time of the second brazing device 4 is too short, the solder cannot completely melt and penetrate, while if the welding time is too long, excessive solder penetration may occur.

[0099] As a preferred embodiment, the welding gas used in the first brazing device 2 is natural gas and oxygen, wherein the natural gas has a pressure of 8 kPa-16 kPa and the oxygen has a pressure of 20 kPa-40 kPa.

[0100] As a preferred embodiment, the welding gas used in the second brazing device 4 is natural gas and oxygen, wherein the natural gas has a pressure of 8 kPa-16 kPa and the oxygen has a pressure of 25 kPa-45 kPa.

[0101] As a preferred embodiment, the solder placement device 3 inputs solder for 4s-7s.

[0102] Example 3

[0103] A method for welding a gas pipe to a liquid storage tank, the gas pipe comprising a straight steel pipe and a copper bend; the copper bend, the straight steel pipe, and the liquid storage tank are mounted on a flame welding machine for processing; the method includes the following steps:

[0104] S1. Clean the copper bends, steel straight pipes and liquid storage tanks to remove surface oil, rust and other defects, and dry them.

[0105] S2. Fix the copper bend to the lifting seat 53, install the steel straight pipe into the liquid storage tank, and fix the liquid storage tank to the fixing seat 52, with the copper bend and the liquid storage tank aligned and fitted.

[0106] S3. The divider drives the workstation plate to rotate, so that the positioning fixture containing the copper bend, steel straight pipe and liquid storage tank moves to the processing area of ​​the first brazing device 2.

[0107] S4. The lifting control unit 6 controls the lifting seat 53 to move upward by 20mm-60mm, and the first brazing device 2 preheats the connection between the steel straight pipe and the liquid storage tank.

[0108] S5. After the preheating work is completed, the lifting control component 6 removes the control of the lifting seat, so that the lifting seat 53 is reset. Then the divider drives the work station plate to rotate, so that the positioning fixture originally located in the processing area of ​​the first brazing device 2 is moved to the processing area of ​​the second brazing device 4.

[0109] S6. The solder placement device 3 fills the gap between the steel straight pipe and the liquid storage tank and the gap between the steel straight pipe and the copper bend with solder, and the second brazing device 4 heats and melts the solder between the steel straight pipe and the copper bend and the solder between the steel straight pipe and the liquid storage tank.

[0110] S7. After the solder is completely melted, the divider drives the station plate to rotate, so that the positioning fixture originally located in the processing area of ​​the second brazing device 4 enters the next station. After the solder cools and solidifies, the steel straight pipe is fixedly connected to the liquid storage tank to form an assembly.

[0111] S8. Remove the assembly.

[0112] In this embodiment, the positioning fixture 5, which holds the copper bend and the liquid storage tank, is located in the processing area of ​​the first brazing device 2. The lifting control component 6 raises the copper bend by 20mm-60mm, moving it away from the liquid storage tank and the straight steel pipe. This allows the first brazing device 2 to preheat the liquid storage tank and the straight steel pipe. Consequently, when the second brazing device 4 performs the heating and welding work, the heat conduction speed of the straight steel pipe is effectively increased, heat loss is reduced, and the heating time required for the copper bend is shortened. This maintains the structural stability of the copper pipe and prevents changes in crystal grain size due to prolonged flame heating, thereby improving the service life of the copper bend. It should be noted that if the copper bend is raised too low, it is easily affected by the flame from the welding torch, causing temperature changes that may affect subsequent welding work. Conversely, if the copper bend is raised too high, the requirements for the lifting control component 6 become too high, increasing the processing difficulty of the lifting control component 6.

[0113] In a preferred embodiment, the preheating time of the connection between the steel straight pipe and the liquid storage tank by the first brazing device 2 in step S4 is 12s-16s. It should be noted that if the preheating time is too short, the connection cannot be preheated to the predetermined temperature, preventing the second brazing device 4 from heating it to the welding temperature. Consequently, the solder cannot effectively melt and penetrate, affecting the welding quality. Conversely, if the preheating time is too long, the surface of the steel straight pipe or the liquid storage tank may melt. In step S6, the heating and melting time of the solder between the steel straight pipe and the copper bend, and between the steel straight pipe and the liquid storage tank by the second brazing device 4 is 12s-16s. It should be noted that if the heating time of the connection between the steel straight pipe and the liquid storage tank by the second brazing device 4 is too short, neither the steel straight pipe nor the liquid storage tank can be heated to the welding temperature. Conversely, if the heating time is too long, the temperature of the steel straight pipe and the liquid storage tank will be too high, and the surface of the steel straight pipe or the liquid storage tank may melt.

[0114] To further explain, the second brazing device 4 requires 5-8 seconds to heat and melt the welding wire. It should be noted that if the heating time of the second brazing device 4 is too short, the solder cannot completely melt and penetrate, while if the welding time is too long, excessive solder penetration may occur.

[0115] Furthermore, in this embodiment, there is a 2-5 second interval between the preheating in step S4 and the heating and welding in step S6.

[0116] Furthermore, in this embodiment, when the first brazing device 2 preheats the steel pipe, the welding torch 22 is at an angle of 30°-50° to the central axis of the liquid storage tank; when heating and welding with the second brazing device 4, the welding torch 22 is at an angle of 30°-50° to the central axis of the liquid storage tank. It should be noted that the welding torch 22 is set at the above angle so that the flame at the point of the welding torch 22 is located at the gap between the steel pipe and the liquid storage tank to heat and melt the welding material. If the angle formed between the welding torch 22 and the central axis of the liquid storage tank exceeds the above range, the flame ejected by the welding torch 22 is easily blocked by the liquid storage tank or the gas pipe, causing the welding material to not be completely melted, affecting the welding quality.

[0117] Furthermore, in this embodiment, the second brazing device 4 in step S6 heats the copper bend to 730℃-780℃. It should be noted that if the copper tube temperature is too low, the solder will not be able to completely melt and penetrate, affecting the welding quality. If the copper tube temperature is too high, the surface of the copper tube is prone to melting, or even perforation.

[0118] As a preferred embodiment, the welding gas used in the first brazing device 2 is natural gas and oxygen, wherein the natural gas has a pressure of 8 kPa-16 kPa and the oxygen has a pressure of 20 kPa-40 kPa.

[0119] As a preferred embodiment, the welding gas used in the second brazing device 4 is natural gas and oxygen, wherein the natural gas has a pressure of 8 kPa-16 kPa and the oxygen has a pressure of 25 kPa-45 kPa.

[0120] As a preferred embodiment, the solder placement device 3 inputs solder for 4s-7s.

[0121] As a preferred embodiment, the first brazing device 2 can use a heating rod instead of a welding torch 22 to preheat the connection between the steel straight pipe and the liquid storage tank. Specifically, the heating rod consumes less energy, is more environmentally friendly, and is safer than a welding torch that sprays a flame.

[0122] Example 4

[0123] A compressor includes a liquid receiver, the liquid receiver comprising an assembly manufactured by the welding method of the gas pipe and the liquid receiver body described in Embodiment 2 or Embodiment 3 above.

[0124] The present invention relates to a flame welding machine, a welding method for gas pipes and liquid storage tanks, and a compressor. Through a reasonable structural design, it solves the problems that when welding steel pipes to liquid storage tanks, oxide films easily form on the surface of the steel gas pipes, and when welding steel straight pipes, copper bends and liquid storage tanks, the crystal grain size of the copper pipes easily changes, leading to easy breakage of the copper pipes and shortening their service life.

[0125] The above description is only a preferred embodiment of the present invention, and its structure is not limited to the shapes listed above. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A flame welding machine, characterized in that: It includes a frame, a first brazing device, a solder placement device, a second brazing device, and several positioning fixtures; wherein: The frame is equipped with a workstation panel and a divider that drives the workstation panel to rotate. Several positioning fixtures are arranged in a circular array on the workstation plate; each positioning fixture includes a bracket, a fixed base, and a lifting base; both the bracket and the fixed base are mounted on the workstation plate; the lifting base is located above the fixed base and is slidably connected to the bracket. The first brazing device and the second brazing device are both located outside the workstation and are arranged sequentially along the rotation direction of the workstation. The first brazing device and the second brazing device correspond to the positions of two adjacent positioning fixtures. A lifting control component that drives the lifting seat to move up and down is installed on the first brazing device. The solder placement device is located outside the second brazing device and mounted on the frame. The first brazing device and the second brazing device have the same structure, both including a movable frame, a welding torch, and a first driving component. The movable frame is slidably connected to the frame. The welding torch is mounted on the side of the movable frame near the workstation. The first driving component is mounted on the frame and is used to drive the movable frame to move closer to or away from the workstation. The lifting control component is mounted on the movable frame of the first brazing device and is used to lift the lifting seat upward when the movable frame moves to the side near the workstation. The lifting control component includes a triangular top plate. The triangular top plate is fixedly connected to the side of the movable frame near the workstation. When the movable frame moves to the side near the workstation, the triangular top plate slides to the side near the workstation. Supported by the slope of the triangular top plate, the lifting seat is lifted upward, thereby lifting the air pipe upward.

2. The flame welding machine according to claim 1, characterized in that: A gas guide pipe is installed in the middle of the fixed base, and the gas guide pipe is connected to the nitrogen distributor.

3. The flame welding machine according to claim 1, characterized in that: The solder placement device includes a mounting column, a lifting adjustment seat, a rotating adjustment seat, a movable seat, a second driving component, and a feed pipe; the mounting column is mounted on the frame; the lifting adjustment seat is mounted on the mounting column; the rotating adjustment seat is mounted on the lifting adjustment seat; the movable seat is slidably connected to the rotating adjustment seat; the second driving component is mounted on the rotating adjustment seat and is used to drive the movable seat to slide. The feed pipe is mounted on the movable base.

4. A method for welding a gas pipe to a liquid storage tank, characterized in that: The gas pipe is a steel pipe, and the steel pipe and the liquid storage tank are installed on the flame welding machine according to any one of claims 1-3 for processing; including the following operation steps: S1. Clean the steel pipes and storage tanks to remove surface oil and rust, and dry them. S2. Fix the steel pipe to the lifting seat and the liquid storage tank to the fixed seat, and align the steel pipe and the liquid storage tank. S3. The divider drives the workstation plate to rotate, so that the positioning fixture holding the steel pipe and the liquid storage tank moves to the processing area of ​​the first brazing device. S4. The lifting seat is moved upward by 5-8mm by the lifting control component, and the steel pipe is preheated by the first brazing device. S5. After the preheating work is completed, the lifting control component removes the control of the lifting seat, so that the lifting seat is reset. Then the divider drives the workstation plate to rotate, so that the positioning fixture originally located in the processing area of ​​the first brazing device is moved to the processing area of ​​the second brazing device. S6. The solder is filled into the gap between the steel pipe and the liquid storage tank by the solder placement device, and the connection between the steel pipe and the liquid storage tank is heated by the second brazing device. S7. After the solder is completely melted, the divider drives the work station plate to rotate, so that the positioning fixture originally located in the processing area of ​​the first brazing device moves to the next work station. After the solder cools and solidifies, the steel pipe is fixedly connected to the liquid storage tank to form an assembly. S8. Remove the assembly.

5. The welding method for a gas pipe and a liquid storage tank according to claim 4, characterized in that: In step S4, the preheating time of the first brazing device on the steel pipe is 12s-16s; in step S6, the heating time of the second brazing device at the connection between the steel pipe and the liquid storage tank is 12s-16s.

6. A method for welding a gas pipe to a liquid storage tank, characterized in that: The gas pipe includes a straight steel pipe and a copper bend; the copper bend, the straight steel pipe, and the liquid storage tank are installed on the flame welding machine according to any one of claims 1-3 for processing; including the following operation steps: S1. Clean the copper bends, steel straight pipes, and liquid storage tanks to remove surface oil and rust, and dry them. S2. Fix the copper bend to the lifting seat, install the steel straight pipe into the liquid storage tank, and fix the liquid storage tank to the fixed seat, with the copper bend and the liquid storage tank aligned and fitted. S3. The divider drives the workstation plate to rotate, so that the positioning fixture containing the copper bend, steel straight pipe and liquid storage tank moves to the processing area of ​​the first brazing device. S4. The lifting seat is moved upward by 20mm-60mm by the lifting control component, and the connection between the steel straight pipe and the liquid storage tank is preheated by the first brazing device. S5. After the preheating work is completed, the lifting control component removes the control of the lifting seat, so that the lifting seat is reset. Then the divider drives the workstation plate to rotate, so that the positioning fixture originally located in the processing area of ​​the first brazing device is moved to the processing area of ​​the second brazing device. S6. The solder placement device fills the gap between the steel straight pipe and the liquid storage tank and the gap between the steel straight pipe and the copper bend with solder, and the second brazing device heats and melts the solder between the steel straight pipe and the copper bend and the solder between the steel straight pipe and the liquid storage tank. S7. After the solder is completely melted, the divider drives the station plate to rotate, so that the positioning fixture originally located in the processing area of ​​the second brazing device moves to the next station. After the solder cools and solidifies, the steel straight pipe is fixedly connected to the liquid storage tank to form an assembly. S8. Remove the assembly.

7. The welding method for a gas pipe and a liquid storage tank according to claim 6, characterized in that: In step S4, the preheating time of the first brazing device at the connection between the steel straight pipe and the liquid storage tank is 12s-16s; in step S6, the heating and melting time of the welding material between the steel straight pipe and the copper bend and between the steel straight pipe and the liquid storage tank by the second brazing device is 12s-16s.

8. A compressor, characterized in that: The device includes a liquid reservoir comprising an assembly manufactured using a welding method for a gas pipe and a liquid reservoir body as described in any one of claims 4-7.

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