Low-temperature working condition cab welding device and machining method thereof

Abstract

A cab welding device under the low-temperature working condition comprises a welding platform, a bottom supporting frame arranged on the welding platform and a side frame arranged on the welding platform, and is characterized in that the side frame is provided with a left side frame and a right side frame, a left positioning mold is arranged on the left side frame, and a right positioning mold is arranged on the right side frame. A left positioning mold is arranged on the left side frame, a right positioning mold is arranged on the right side frame, assembling holes are formed in the left supporting table and the right supporting table, assembling rods are movably connected into the assembling holes, meshing grooves are formed in the assembling rods, a top cross rod is fixed into the meshing grooves through bolts, and a top positioning mold is arranged on the top cross rod. A fluorescent flaw detection part is arranged on the top cross rod, a driving cylinder is arranged on the top cross rod, after welding is finished, flaw detection treatment of welding seams of cab welding can be carried out, and during flaw detection treatment, mechanical energy flaw detection can be carried out on the conditions of the welding seams by means of the fluorescent flaw detection part.

Description

Technical Field

[0001] The invention relates to a welding device and a method thereof, and in particular to a low-temperature working condition cab welding device and a processing method thereof. Background Art

[0002] The cab is an important part of the body of a truck and a special-purpose vehicle. It is where professional drivers work day and night. Its structure is directly related to the driver's safety, work efficiency and health. When producing the cab, welding equipment is required to perform welding operations between the cab components. The welding equipment can be used to perform the welding of the cab well, making the welding process of the cab frame more convenient and efficient, meeting the processing needs.

[0003] CN201921705737.8 A heavy-duty truck cab welding device. The utility model relates to the technical field of heavy-duty truck processing, and in particular to a heavy-duty truck cab welding device, comprising a mechanical arm, a welding arm, a fixed frame and a base, a feed rail is installed in the middle position above the base, a transmission seat is installed on the feed rail, columns are symmetrically arranged on the left and right sides of the transmission seat, a transmission box is installed above the two columns, a welding arm is installed on the mechanical arm, a welding head is arranged at one end of the welding arm close to the support plate, the welding head is rotatably connected to the welding arm through a rotating shaft, a fixed frame is installed on the welding head, trapezoidal blocks are symmetrically arranged on the two sides of the fixed frame, the trapezoidal blocks are slidably connected to the fixed frame, and guide wheels are arranged on the inner side of the trapezoidal blocks.

[0004] Although the prior art improves the welding quality of the device, ensures the stability of the device welding, and increases the processing range of the device by providing a welding arm, a fixing frame, and a camera, the welding device in the prior art has a low degree of welding intelligence. During welding, the cab components that need to be welded cannot be moved for welding, which is not convenient enough. Summary of the invention

[0005] In order to overcome the deficiencies of the prior art, the present invention provides a low-temperature operating cab welding device and a processing method thereof.

[0006] The present invention is implemented by the following technical scheme: a low-temperature working condition cab welding device comprises a welding platform, a bottom support frame is arranged on the welding platform, a side frame is arranged on the welding platform, a left side frame and a right side frame are arranged on the side frame, a left positioning mold is arranged on the left side frame, a right positioning mold is arranged on the right side frame, a left positioning platform is arranged on the left positioning mold, a right positioning platform is arranged on the right positioning mold, a left threaded hole is arranged on the left positioning platform, a right threaded hole is arranged on the right positioning platform, a left positioning screw is assembled in the left threaded hole, a right positioning rod is assembled in the right threaded hole, a sinking groove is arranged on the welding platform, and a A heating component is arranged at the bottom of the sinking groove, and the heating component is a heating transmission channel, and a heating medium is infused in the heating transmission channel. A left support platform and a right support platform are arranged on both sides of the welding platform, and a left bracket is arranged on the left support platform, and a right bracket is arranged on the right support platform. A driving motor is arranged on the left bracket, and the driving motor is a reciprocating motor. The reciprocating motor drives the conveyor belt to reciprocate by forward and reverse rotation, and the reciprocating operation of the conveyor belt drives the slider to reciprocate. A transmission roller is arranged on the right bracket, and a transmission belt is arranged between the driving motor and the transmission roller. A guide rail is arranged at the bottom of the welding platform, and a slider is arranged on the guide rail. The welding platform is fixed on the slider by rivets;

[0007] A component for flaw detection is arranged on the top of the welding platform, and the flaw detection component is a fluorescent flaw detection component. Assembly holes are arranged on the left support platform and the right support platform, and an assembly rod is movably connected in the assembly hole, and an engagement groove is arranged on the assembly rod, and a top cross bar is fixed in the engagement groove by bolts, and a fluorescent flaw detection component is arranged on the top cross bar, and a driving cylinder is arranged on the top cross bar, and a driving rod is arranged on the driving cylinder, and a magnetic block is arranged on the driving rod, and a sucked rod is arranged on the magnetic block, and a fluorescent flaw detection component is arranged on the sucked rod, and the fluorescent flaw detection component is an ultraviolet lamp;

[0008] A welding station is arranged on one side of the welding platform, a moving part is arranged at the bottom of the welding station, a welding manipulator is arranged on the welding station, a mechanical arm is arranged on the welding manipulator, a wire feeder is arranged on the mechanical arm, a welding wire is arranged on the wire feeder, a data acquisition part is arranged on the mechanical arm, the data acquisition part is a camera or a laser sensor, and the camera or the laser sensor monitors the weld shape or welding trajectory of the welding part;

[0009] The wire feeder of the robotic arm is provided with a welding wire, an arc tracking system is provided next to the welding wire, a thermal radiation sensor is provided on the arc tracking system, the thermal radiation sensor is an infrared sensor, the infrared sensor monitors the change of thermal radiation of the weld, a weld will be generated when welding the cab, and the weld will generate high temperature. When the weld generates high temperature, it will emit thermal radiation in the form of electromagnetic waves, the infrared sensor receives the infrared radiation, and the infrared sensor is used to convert the infrared radiation into an electrical signal, a protective cover is provided outside the infrared sensor, and the protective cover is a protective filter.

[0010] The moving part is a rotating platform, a mounting flange is arranged on the mechanical arm, the mechanical arm is fixedly connected with the rotating platform by bolts via the mounting flange, a bottom supporting platform is arranged at the bottom of the rotating platform, side supporting parts are arranged on both sides of the bottom supporting platform, and the side supporting parts are supporting hydraulic cylinders.

[0011] The steps include:

[0012] The first step is to select the plate. When selecting the plate, consider the use environment of the cab. The cab is used in low-temperature conditions, so it is necessary to select cold-resistant plates for processing. Then, after the plate is selected, the plate is pretreated. During the plate pretreatment, physical pretreatment and chemical pretreatment are required. During the physical pretreatment, the plate needs to be inspected. During the inspection, X-ray inspection or magnetic particle inspection is relied on; then chemical pretreatment is carried out. The selected plate is placed in a chemical treatment tank for treatment. A pretreatment mixture is placed in the treatment tank. The pretreatment mixture can use oxalic acid solvent and surfactant. The pretreatment mixture is dripped into the chemical tank, and then the outer surface of the plate can be cleaned with the pretreatment mixture;

[0013] The sheet is cut after physical and chemical pretreatment. During the cutting process, the sheet is processed by cutting equipment. The cutting equipment can be an intelligent cutting machine. During the cutting process, the sheet is placed on the cutting equipment for cutting. After the cutting process, a cab blank is formed. The cab blank undergoes external surface treatment. During the external surface treatment, a protective film is provided outside the cab blank. The cab blank is protected by the protective film. The protective film adopts a degradable protective film. The cab blank is placed in a treatment room for treatment and waits for 1-3 hours. Then, the protective film can be adsorbed on the outside of the cab blank, so as to avoid damage to the outer surface of the cab.

[0014] The second step is to assemble the mold. The mold is assembled according to the appearance of different types of vehicles. When installing the mold, a mold base is provided on the mold, and mold positioning points are provided on the mold base. The mold parts are assembled by an automatic assembly manipulator. A program for mold positioning points is provided in the automatic assembly manipulator. Then, when mold positioning and assembly are required, the automatic assembly manipulator is operated by a computer to insert the mold parts into the mold positioning points. Then, different mold positioning points are assembled with different mold parts, so that the mold can be assembled well. The assembly of different molds can form the width and length of the mold required by different cabs. In this way, different types of cabs can be assembled according to the needs of different models of molds. The cab blank is arranged according to the shape of the mold assembly, and the cab blank is initially welded. After the initial welding, the cab blank is assembled and welded;

[0015] In the third step, the cab frame is formed from the initially welded cab blank, and the cab frame is placed on a welding platform for subsequent welding. A left positioning mold and a right positioning mold are arranged on the welding platform, and the cab frame is positioned and clamped by using the left positioning mold and the right positioning mold. Then, the heat transfer channel is started, and a heating medium is infused into the heat transfer channel. The heating medium is a heating gas, and the heating gas can provide thermal support to the bottom of the cab frame, so that the welding manipulator can save more effort during welding, and the temperature does not need to be too high during welding, which reduces the energy consumption during welding, and thus the welding effect can be guaranteed;

[0016] The fourth step is to monitor the weld. During the monitoring, infrared sensors are used to monitor the changes in the thermal radiation of the weld. When welding the cab, welds will be generated, and the welds on the cab will generate high temperatures. When the welds generate high temperatures, they will emit thermal radiation in the form of electromagnetic waves. The infrared sensor receives the infrared radiation and converts it into an electrical signal. In this way, the infrared sensor can be used to transmit the information of the weld to the operating computer and system. The operator can observe the changes in the weld by operating the computer and adjust the temperature of the welding wire in time, so that the welding effect of the weld can be further guaranteed.

[0017] The fifth step is to perform flaw detection on the cab frame. A fluorescent flaw detection component for flaw detection after welding is arranged on the top of the welding platform. The fluorescent flaw detection component is used to release ultraviolet rays to perform flaw detection on the welds on the cab frame. This makes the flaw detection process more convenient. During welding, there is no need to assemble the fluorescent flaw detection component on the top of the welding platform. After the cab frame welding is completed, the fluorescent flaw detection component can be assembled on the top of the welding platform, and then the welds of the cab frame can be flaw detected by the fluorescent flaw detection component. The flaw detection efficiency also becomes more convenient.

[0018] The sixth step is to perform repair welding of the cab frame. During the repair welding, the cab frame weld needs to be processed. During the weld processing, a chemical degreasing agent needs to be dripped onto the weld. The chemical degreasing agent is ethanol or acetone. The grease on the weld can be cleaned by using ethanol or acetone. Then, the weld treated with grease is added with welding auxiliary materials again. The welding auxiliary materials are dripped into the weld. The welding auxiliary materials are pre-welding antioxidants. The pre-welding antioxidants are a combination of aluminum powder, silicon oxide, borax and a film-forming agent. The pre-welding antioxidants are dripped into the weld. Then, welding paste is sprayed on the outer surface of the weld. The welding paste is a mixed liquid of ceramic particles, graphite, silicone oil and ethanol solvent. Then, the welding paste is sprayed on the weld. Finally, the repair welding operation of the cab frame is performed.

[0019] The seventh step is to carry out post-welding processing of the cab frame. After the welding operation by the welding manipulator, the cab frame has completed large-area welding work. After welding, post-welding processing is carried out. The cab frame is placed in the post-processing room for post-processing. The outside of the cab frame is sprayed with phosphating liquid, and then the passivation liquid is sprayed, and finally anti-corrosion sealant is sprayed at the weld position, and finally anti-corrosion paint is sprayed on the outside of the cab frame.

[0020] Compared with the prior art, a left support platform and a right support platform are arranged on both sides of the welding platform, a left bracket is arranged on the left support platform, a right bracket is arranged on the right support platform, a driving motor is arranged on the left bracket, a transmission roller is arranged on the right bracket, a transmission belt is arranged between the driving motor and the transmission roller, a guide rail is arranged at the bottom of the welding platform, a slider is arranged on the guide rail, the welding platform is fixed on the slider by rivets, and the position can be adjusted when the cab frame placed on the welding platform is welded, which changes the need in the prior art that the cab frame can only be processed in a fixed place, and makes the welding process more convenient.

[0021] A component for flaw detection is arranged on the top of the welding platform, and the flaw detection component is a fluorescent flaw detection component. Assembly holes are arranged on the left support platform and the right support platform, and an assembly rod is movably connected in the assembly hole, and an engagement groove is arranged on the assembly rod, and a top cross bar is fixed in the engagement groove by bolts, and a fluorescent flaw detection component is arranged on the top cross bar, and a driving cylinder is arranged on the top cross bar. After welding is completed, the flaw detection of the weld of the cab welding can be carried out. During the flaw detection, the weld can be mechanically detected by the fluorescent flaw detection component, and then a driving cylinder is arranged on the top cross bar, and a driving rod is arranged on the driving cylinder, and a magnetic block is arranged on the driving rod, and a sucked rod is arranged on the magnetic block, and a fluorescent flaw detection component is arranged on the sucked rod. The fluorescent flaw detection component is an ultraviolet lamp, and the cylinder can be used to drive the movement of the fluorescent flaw detection component, thereby meeting the needs of flaw detection of the cab frame at different distances.

[0022] Before welding the cab frame, it is necessary to select the plates and pretreat them. During the pretreatment of the plates, physical pretreatment and chemical pretreatment are required. During the physical pretreatment, the plates need to be subjected to flaw detection, which is done by X-ray flaw detection or magnetic particle flaw detection. Then chemical pretreatment is performed, the selected plates are placed in a chemical treatment tank for treatment, and a pretreatment mixture is placed in the treatment tank. The pretreatment mixture can be made of oxalic acid solvent and surfactant, and the pretreatment mixture is dripped into the chemical tank, and then the outer surface of the plate can be cleaned by the pretreatment mixture. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the structure of the present invention;

[0024] Figure 2 It is a schematic diagram of the structure of the present invention;

[0025] Figure 3 It is a schematic diagram of the structure of the present invention;

[0026] Figure 4 It is a schematic diagram of the structure of the present invention;

[0027] Figure 5 It is a schematic diagram of the structure of the present invention;

[0028] Figure 6 It is a schematic diagram of the structure of the present invention;

[0029] In the figure: 1 is a welding platform, 2 is a bottom support frame, 3 is a left side frame, 4 is a right side frame, 5 is a left positioning mold, 6 is a right positioning mold, 7 is a sinking groove, 8 is a heat transfer channel, 9 is a left support platform, 10 is a right support platform, 11 is a drive motor, 12 is a drive roller, 13 is a transmission belt, 14 is a guide rail, 15 is a slider, 16 is an assembly rod, 17 is a top cross bar, 18 is a drive cylinder, 19 is a drive rod, 20 is a fluorescent flaw detection component, 21 is a welding station, 22 is a welding manipulator, 23 is a wire feeder, 24 is a data acquisition component, 25 is a rotating platform, 26 is a bottom support platform, and 27 is a supporting hydraulic cylinder. DETAILED DESCRIPTION

[0030] The present invention is further described below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form a new embodiment.

[0031] A low-temperature working condition cab welding device comprises a welding platform 1, a bottom support frame 2 is arranged on the welding platform 1, a side frame is arranged on the welding platform 1, the side frame is provided with a left side frame 3 and a right side frame 4, a left positioning mold 5 is arranged on the left side frame 3, a right positioning mold 6 is arranged on the right side frame 4, a left positioning platform is arranged on the left positioning mold 5, a right positioning platform is arranged on the right positioning mold 6, a left threaded hole is arranged on the left positioning platform, a right threaded hole is arranged on the right positioning platform, a left positioning screw is assembled in the left threaded hole, a right positioning rod is assembled in the right threaded hole, a sinking groove 7 is arranged on the welding platform 1, and a heating component is arranged at the bottom of the sinking groove 7, The heating component is a heating transmission channel 8, and a heating medium is infused in the heating transmission channel 8. A left support platform 9 and a right support platform 10 are arranged on both sides of the welding platform 1. A left bracket is arranged on the left support platform 9, and a right bracket is arranged on the right support platform 10. A driving motor 11 is arranged on the left bracket, and the driving motor 11 is a reciprocating motor. The reciprocating motor drives the conveyor belt 13 to reciprocate by forward and reverse rotation, and the reciprocating operation of the conveyor belt 13 drives the slider to reciprocate. A transmission roller 12 is arranged on the right bracket, and a conveyor belt 13 is arranged between the driving motor 11 and the transmission roller 12. A guide rail 14 is arranged at the bottom of the welding platform 1, and a slider 15 is arranged on the guide rail 14. The welding platform 1 is fixed on the slider by rivets;

[0032] A component for flaw detection is arranged on the top of the welding platform 1, and the flaw detection component is a fluorescent flaw detection component. Assembly holes are arranged on the left support platform 9 and the right support platform 10, and an assembly rod 16 is movably connected in the assembly hole, and an engagement groove is arranged on the assembly rod 16, and a top cross bar 17 is fixed in the engagement groove by bolts, and a fluorescent flaw detection component is arranged on the top cross bar 17, and a driving cylinder 18 is arranged on the driving cylinder 18, and a driving rod is arranged on the driving rod 19, and a magnetic block is arranged on the magnetic block, and a sucked rod is arranged on the sucked rod, and a fluorescent flaw detection component 20 is arranged on the sucked rod, and the fluorescent flaw detection component 20 is an ultraviolet lamp;

[0033] A welding station 21 is provided on one side of the welding platform 1, a moving part is provided at the bottom of the welding station 21, a welding manipulator 22 is provided on the welding station 21, a mechanical arm is provided on the welding manipulator 22, a wire feeder 23 is provided on the mechanical arm, a welding wire is provided on the wire feeder 23, a data acquisition component 24 is provided on the mechanical arm, and the data acquisition component 24 is a camera or a laser sensor, and the camera or the laser sensor monitors the weld shape or welding trajectory of the welding component;

[0034] A welding wire is arranged on the wire feeder 23 of the robotic arm, an arc tracking system is arranged next to the welding wire, a thermal radiation sensor 24 is arranged on the arc tracking system, and the thermal radiation sensor 24 is an infrared sensor. The infrared sensor monitors the change of thermal radiation of the weld. When welding the cab, a weld will be generated, and the weld will have high temperature. When the weld generates high temperature, it will emit thermal radiation in the form of electromagnetic waves. The infrared sensor receives the infrared radiation and converts the infrared radiation into an electrical signal by using the infrared sensor. A protective cover is arranged outside the infrared sensor, and the protective cover is a protective filter.

[0035] The moving component is a rotating platform 25, and a mounting flange is provided on the robotic arm. The robotic arm is fixedly connected to the rotating platform by bolts via the mounting flange. A bottom support platform 26 is provided at the bottom of the rotating platform 25, and side support components are provided on both sides of the bottom support platform 26, and the side support components are supporting hydraulic cylinders 27.

[0036] The steps include:

[0037] The first step is to select the plate. When selecting the plate, consider the use environment of the cab. The cab is used in low-temperature conditions, so it is necessary to select cold-resistant plates for processing. Then, after the plate is selected, the plate is pretreated. During the plate pretreatment, physical pretreatment and chemical pretreatment are required. During the physical pretreatment, the plate needs to be inspected. During the inspection, X-ray inspection or magnetic particle inspection is relied on; then chemical pretreatment is carried out. The selected plate is placed in a chemical treatment tank for treatment. A pretreatment mixture is placed in the treatment tank. The pretreatment mixture can use oxalic acid solvent and surfactant. The pretreatment mixture is dripped into the chemical tank, and then the outer surface of the plate can be cleaned with the pretreatment mixture;

[0038] The sheet is cut after physical and chemical pretreatment. During the cutting process, the sheet is processed by cutting equipment. The cutting equipment can be an intelligent cutting machine. During the cutting process, the sheet is placed on the cutting equipment for cutting. After the cutting process, a cab blank is formed. The cab blank undergoes external surface treatment. During the external surface treatment, a protective film is provided outside the cab blank. The cab blank is protected by the protective film. The protective film adopts a degradable protective film. The cab blank is placed in a treatment room for treatment and waits for 1-3 hours. Then, the protective film can be adsorbed on the outside of the cab blank, so as to avoid damage to the outer surface of the cab.

[0039] The second step is to assemble the mold. The mold is assembled according to the appearance of different types of vehicles. When installing the mold, a mold base is provided on the mold, and mold positioning points are provided on the mold base. The mold parts are assembled by an automatic assembly manipulator. A program for mold positioning points is provided in the automatic assembly manipulator. Then, when mold positioning and assembly are required, the automatic assembly manipulator is operated by a computer to insert the mold parts into the mold positioning points. Then, different mold positioning points are assembled with different mold parts, so that the mold can be assembled well. The assembly of different molds can form the width and length of the mold required by different cabs. In this way, different types of cabs can be assembled according to the needs of different models of molds. The cab blank is arranged according to the shape of the mold assembly, and the cab blank is initially welded. After the initial welding, the cab blank is assembled and welded;

[0040] In the third step, the cab frame is formed from the initially welded cab blank, and the cab frame is placed on a welding platform for subsequent welding. A left positioning mold and a right positioning mold are arranged on the welding platform, and the cab frame is positioned and clamped by using the left positioning mold and the right positioning mold. Then, the heat transfer channel is started, and a heating medium is infused into the heat transfer channel. The heating medium is a heating gas, and the heating gas can provide thermal support to the bottom of the cab frame, so that the welding manipulator can save more effort during welding, and the temperature does not need to be too high during welding, which reduces the energy consumption during welding, and thus the welding effect can be guaranteed;

[0041] The fourth step is to monitor the weld. During the monitoring, infrared sensors are used to monitor the changes in the thermal radiation of the weld. When welding the cab, welds will be generated, and the welds on the cab will generate high temperatures. When the welds generate high temperatures, they will emit thermal radiation in the form of electromagnetic waves. The infrared sensor receives the infrared radiation and converts it into an electrical signal. In this way, the infrared sensor can be used to transmit the information of the weld to the operating computer and system. The operator can observe the changes in the weld by operating the computer and adjust the temperature of the welding wire in time, so that the welding effect of the weld can be further guaranteed.

[0042] The fifth step is to perform flaw detection on the cab frame. A fluorescent flaw detection component for flaw detection after welding is arranged on the top of the welding platform. The fluorescent flaw detection component is used to release ultraviolet rays to perform flaw detection on the welds on the cab frame. This makes the flaw detection process more convenient. During welding, there is no need to assemble the fluorescent flaw detection component on the top of the welding platform. After the cab frame welding is completed, the fluorescent flaw detection component can be assembled on the top of the welding platform, and then the welds of the cab frame can be flaw detected by the fluorescent flaw detection component. The flaw detection efficiency also becomes more convenient.

[0043] The sixth step is to perform repair welding of the cab frame. During the repair welding, the cab frame weld needs to be processed. During the weld processing, a chemical degreasing agent needs to be dripped onto the weld. The chemical degreasing agent is ethanol or acetone. The grease on the weld can be cleaned by using ethanol or acetone. Then, the weld treated with grease is added with welding auxiliary materials again. The welding auxiliary materials are dripped into the weld. The welding auxiliary materials are pre-welding antioxidants. The pre-welding antioxidants are a combination of aluminum powder, silicon oxide, borax and a film-forming agent. The pre-welding antioxidants are dripped into the weld. Then, welding paste is sprayed on the outer surface of the weld. The welding paste is a mixed liquid of ceramic particles, graphite, silicone oil and ethanol solvent. Then, the welding paste is sprayed on the weld. Finally, the repair welding operation of the cab frame is performed.

[0044] The seventh step is to carry out post-welding processing of the cab frame. After the welding operation by the welding manipulator, the cab frame has completed large-area welding work. After welding, post-welding processing is carried out. The cab frame is placed in the post-processing room for post-processing. The outside of the cab frame is sprayed with phosphating liquid, and then the passivation liquid is sprayed, and finally anti-corrosion sealant is sprayed at the weld position, and finally anti-corrosion paint is sprayed on the outside of the cab frame.

[0045] The above-mentioned embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. A low temperature working condition cab welding device, comprising a welding platform, a bottom support frame is arranged on the welding platform, and a side frame is arranged on the welding platform, characterized in that: The side frame is provided with a left side frame and a right side frame, a left positioning mold is provided on the left side frame, a right positioning mold is provided on the right side frame, a left positioning platform is provided on the left positioning mold, a right positioning platform is provided on the right positioning mold, a left threaded hole is provided on the left positioning platform, a right threaded hole is provided on the right positioning platform, a left positioning screw is installed in the left threaded hole, a right positioning rod is installed in the right threaded hole, a sinking groove is provided on the welding platform, a heating component is provided at the bottom of the sinking groove, the heating component is a heating transmission channel, the A heating medium is infused into the heating transmission channel, a left support platform and a right support platform are arranged on both sides of the welding platform, a left bracket is arranged on the left support platform, a right bracket is arranged on the right support platform, a driving motor is arranged on the left bracket, a transmission roller is arranged on the right bracket, a transmission belt is arranged between the driving motor and the transmission roller, the driving motor is a reciprocating motor, the reciprocating motor drives the transmission belt to reciprocate by forward and reverse rotation, and the reciprocating operation of the transmission belt drives the slider to reciprocate, a guide rail is arranged at the bottom of the welding platform, a slider is arranged on the guide rail, and the welding platform is fixed on the slider by rivets; A component for flaw detection is arranged on the top of the welding platform, and the flaw detection component is a fluorescent flaw detection component. Assembly holes are arranged on the left support platform and the right support platform, and an assembly rod is movably connected in the assembly hole, and an engagement groove is arranged on the assembly rod, and a top cross bar is fixed in the engagement groove by bolts, and a fluorescent flaw detection component is arranged on the top cross bar, and a driving cylinder is arranged on the top cross bar, and a driving rod is arranged on the driving cylinder, and a magnetic block is arranged on the driving rod, and a sucked rod is arranged on the magnetic block, and a fluorescent flaw detection component is arranged on the sucked rod, and the fluorescent flaw detection component is an ultraviolet lamp; A welding station is arranged on one side of the welding platform, a moving part is arranged at the bottom of the welding station, a welding manipulator is arranged on the welding station, a mechanical arm is arranged on the welding manipulator, a wire feeder is arranged on the mechanical arm, a welding wire is arranged on the wire feeder, a data acquisition part is arranged on the mechanical arm, the data acquisition part is a camera or a laser sensor, and the camera or the laser sensor monitors the weld shape or welding trajectory of the welding part.

2. A low temperature working condition cab welding device according to claim 1, characterized in that: The wire feeder of the robotic arm is provided with a welding wire, an arc tracking system is provided next to the welding wire, a thermal radiation sensor is provided on the arc tracking system, the thermal radiation sensor is an infrared sensor, the infrared sensor monitors the change of thermal radiation of the weld, a weld will be generated when welding the cab, and the weld will generate high temperature. When the weld generates high temperature, it will emit thermal radiation in the form of electromagnetic waves, the infrared sensor receives the infrared radiation, and the infrared sensor is used to convert the infrared radiation into an electrical signal, a protective cover is provided outside the infrared sensor, and the protective cover is a protective filter.

3. A low temperature working condition cab welding device according to claim 2, characterized in that: The moving part is a rotating platform, a mounting flange is arranged on the mechanical arm, the mechanical arm is fixedly connected with the rotating platform by bolts via the mounting flange, a bottom supporting platform is arranged at the bottom of the rotating platform, side supporting parts are arranged on both sides of the bottom supporting platform, and the side supporting parts are supporting hydraulic cylinders.

4. The processing method of a low temperature working condition cab welding device according to claim 1 is characterized in that: The steps include: The first step is to select the plate. When selecting the plate, consider the use environment of the cab. The cab is used in low-temperature conditions, so it is necessary to select cold-resistant plates for processing. Then, after the plate is selected, the plate is pretreated. During the plate pretreatment, physical pretreatment and chemical pretreatment are required. During the physical pretreatment, the plate needs to be inspected. During the inspection, X-ray inspection or magnetic particle inspection is relied on; then chemical pretreatment is carried out. The selected plate is placed in a chemical treatment tank for treatment. A pretreatment mixture is placed in the treatment tank. The pretreatment mixture can use oxalic acid solvent and surfactant. The pretreatment mixture is dripped into the chemical tank, and then the outer surface of the plate can be cleaned with the pretreatment mixture; The sheet is cut after physical and chemical pretreatment. During the cutting process, the sheet is processed by cutting equipment. The cutting equipment can be an intelligent cutting machine. During the cutting process, the sheet is placed on the cutting equipment for cutting. After the cutting process, a cab blank is formed. The cab blank undergoes external surface treatment. During the external surface treatment, a protective film is provided outside the cab blank. The cab blank is protected by the protective film. The protective film adopts a degradable protective film. The cab blank is placed in a treatment room for treatment and waits for 1-3 hours. Then, the protective film can be adsorbed on the outside of the cab blank, so as to avoid damage to the outer surface of the cab. The second step is to assemble the mold. The mold is assembled according to the appearance of different types of vehicles. When installing the mold, a mold base is provided on the mold, and mold positioning points are provided on the mold base. The mold parts are assembled by an automatic assembly manipulator. A program for mold positioning points is provided in the automatic assembly manipulator. Then, when mold positioning and assembly are required, the automatic assembly manipulator is operated by a computer to insert the mold parts into the mold positioning points. Then, different mold positioning points are assembled with different mold parts, so that the mold can be assembled well. The assembly of different molds can form the width and length of the mold required by different cabs. In this way, different types of cabs can be assembled according to the needs of different models of molds. The cab blank is arranged according to the shape of the mold assembly, and the cab blank is initially welded. After the initial welding, the cab blank is assembled and welded; In the third step, the cab frame is formed from the initially welded cab blank, and the cab frame is placed on a welding platform for subsequent welding. A left positioning mold and a right positioning mold are provided on the welding platform, and the cab frame is positioned and clamped by using the left positioning mold and the right positioning mold. Then the heat transfer channel is started, and a heating medium is infused into the heat transfer channel. The heating medium is a heating gas, and the heating gas can provide thermal support to the bottom of the cab frame, so that the welding manipulator can save more effort during welding, and the temperature does not need to be too high during welding, which reduces the energy consumption during welding, and thus the welding effect can be guaranteed.

5. The processing method of the low temperature working condition cab welding device according to claim 4 is characterized in that: The steps include: The fourth step is to monitor the weld. During the monitoring, infrared sensors are used to monitor the changes in the thermal radiation of the weld. When welding the cab, welds will be generated, and the welds on the cab will generate high temperatures. When the welds generate high temperatures, they will emit thermal radiation in the form of electromagnetic waves. The infrared sensor receives the infrared radiation and converts it into an electrical signal. In this way, the infrared sensor can be used to transmit the information of the weld to the operating computer and system. The operator can observe the changes in the weld by operating the computer and adjust the temperature of the welding wire in time, so that the welding effect of the weld can be further guaranteed. The fifth step is to perform flaw detection on the cab frame. A fluorescent flaw detection component for flaw detection after welding is arranged on the top of the welding platform. The fluorescent flaw detection component is used to release ultraviolet rays to perform flaw detection on the welds on the cab frame. This makes the flaw detection process more convenient. During welding, there is no need to assemble the fluorescent flaw detection component on the top of the welding platform. After the cab frame welding is completed, the fluorescent flaw detection component can be assembled on the top of the welding platform, and then the welds of the cab frame can be flaw detected by the fluorescent flaw detection component. The flaw detection efficiency also becomes more convenient. The sixth step is to perform repair welding of the cab frame. During the repair welding, the cab frame weld needs to be processed. During the weld processing, a chemical degreasing agent needs to be dripped onto the weld. The chemical degreasing agent is ethanol or acetone. The grease on the weld can be cleaned by using ethanol or acetone. Then, the weld treated with grease is added with welding auxiliary materials again. The welding auxiliary materials are dripped into the weld. The welding auxiliary materials are pre-welding antioxidants. The pre-welding antioxidants are a combination of aluminum powder, silicon oxide, borax and a film-forming agent. The pre-welding antioxidants are dripped into the weld. Then, welding paste is sprayed on the outer surface of the weld. The welding paste is a mixed liquid of ceramic particles, graphite, silicone oil and ethanol solvent. Then, the welding paste is sprayed on the weld. Finally, the repair welding operation of the cab frame is performed. The seventh step is to carry out post-welding processing of the cab frame. After the welding operation by the welding manipulator, the cab frame has completed large-area welding work. After welding, post-welding processing is carried out. The cab frame is placed in the post-processing room for post-processing. The outside of the cab frame is sprayed with phosphating liquid, and then the passivation liquid is sprayed, and finally anti-corrosion sealant is sprayed at the weld position, and finally anti-corrosion paint is sprayed on the outside of the cab frame.

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