Railway rail welding apparatus

Abstract

The railway rail welding equipment provided in the embodiments of the present application comprises a walking platform and a welding device for welding a steel rail; a hoisting device located on the walking platform, one end of which is hinged to the walking platform and the other end of which is used for being connected with the welding device, for hoisting and moving the welding device; an extension platform device used for placing the welding device and located at the front side along the longitudinal direction of the walking platform; and a dual-purpose walking device for walking on a railway or a road, which is located below the walking platform and used for driving the railway rail welding equipment to walk on the railway or the road. In the present application, the extension platform device is arranged at the longitudinal front end of the walking platform, which can move longitudinally and vertically relative to the walking platform, expand the vertical distance and space between the extension platform device and the hoisting device, and cooperate with the hoisting device to hoist and return the welding device placed on the extension platform device, thereby solving the problem that the hoisting device cannot directly hoist the welding device due to height limitation, and the whole machine is stable and reliable when hoisted.

Description

Technical Field

[0001] This application relates to the field of track maintenance technology, and more specifically, to a railway rail welding device. Background Technology

[0002] Currently, the welding of rail joints at stations and turnouts is mainly carried out manually with small machines due to the complex working conditions of the turnout pre-laying site and the complicated process of getting the equipment to the welding position. This method requires a large number of workers to weld rails at the turnout, resulting in high labor intensity and high labor costs. At the same time, due to different work experience, the welding quality of the welds varies, and the comprehensive mechanical properties of the welds are different, which reduces the safety of the track.

[0003] Due to the limitations of manual welding, rail welding equipment for both railway and highway use is currently used for welding rails at turnouts. However, due to the height restrictions of railway tunnels or work locations, there is insufficient space for the boom to lift and place the welding equipment, making it impossible to directly pick up and place the equipment. This requires the participation of workers, resulting in high labor intensity. Furthermore, when the boom model or specifications are changed to meet the space requirements, the problem of insufficient rigidity arises, which cannot meet the lifting force required by the welding equipment. Utility Model Content

[0004] This application provides a railway rail welding device to solve the problem that existing railway rail welding devices cannot be effectively hoisted and placed directly on railways or at work locations due to height restrictions.

[0005] To achieve the above objectives, this application provides the following technical solution:

[0006] A railway rail welding device, comprising:

[0007] Traveling platform and welding equipment for welding rails;

[0008] A hoisting device is located on the traveling platform, with one end hinged to the traveling platform and the other end connected to the welding device, for lifting and moving the welding device;

[0009] An extension platform device is used to place the welding device. It is located at the front end along the longitudinal direction of the traveling platform. The extension platform device can move longitudinally and vertically relative to the traveling platform to cooperate with the hoisting device to lift and lower the welding device.

[0010] Optionally, the extension platform device includes:

[0011] An extension platform, a longitudinal moving component, and a vertical moving component are provided. The extension platform is fixed to the vertical moving platform component and moves vertically relative to the traveling platform under the drive of the vertical moving component.

[0012] The vertical moving component is mounted on the longitudinal moving component and moves longitudinally relative to the traveling platform under the drive of the longitudinal moving component.

[0013] Optionally, the longitudinal movement assembly includes a set of longitudinal telescopic members disposed laterally opposite each other on the traveling platform, and any set of the longitudinal telescopic members includes:

[0014] The system includes a telescopic guide sleeve, a telescopic guide post, and a telescopic hydraulic cylinder. The telescopic guide sleeve is fixed longitudinally to the traveling platform. The telescopic guide post is fitted inside the telescopic guide sleeve. The telescopic hydraulic cylinder is located inside the telescopic guide sleeve, and its two ends are respectively connected to the telescopic guide sleeve and the telescopic guide post to drive the telescopic guide post to move relative to the telescopic guide sleeve.

[0015] Optionally, the vertical moving assembly includes a set of vertical lifting members disposed laterally opposite to the longitudinal moving assembly, wherein any set of the vertical lifting members includes:

[0016] A lifting guide sleeve, which is fixed to the inner lateral side of the telescopic guide column;

[0017] A lifting guide column, and a set thereof; the extension platform is fixed to the lifting guide column, and the lifting guide column is used to support the ground;

[0018] The lifting cylinder is located inside the lifting guide sleeve, and its two ends are respectively connected to the lifting guide sleeve and the lifting guide column, and is used to drive the lifting guide column and the extension platform to move vertically.

[0019] Optionally, the extension platform is located at the vertical bottom end of the lifting guide column.

[0020] Optionally, it also includes a dual-purpose road-rail traveling device located below the traveling platform, used to drive the railway rail welding equipment to travel on the railway or road; the dual-purpose road-rail traveling device includes:

[0021] At least two sets of traveling steel wheel devices, any one of which is movably connected to the chassis of the railway rail welding equipment, for driving the dual-purpose rail welding equipment to travel on the railway;

[0022] At least two sets of tracked traveling devices are arranged side by side on both sides of the chassis of the railway rail welding equipment to drive the dual-purpose rail and road welding equipment to travel on the road.

[0023] Specifically, when the tracked traveling device is traveling on a road, the traveling steel wheel device rises and leaves the road surface; when the traveling steel wheel device is traveling on a railway, the traveling steel wheel device lowers to support the rail surface and causes the tracked traveling device to rise and leave the road surface.

[0024] Optionally, the hoisting device includes a telescopic boom and a hook, one end of the telescopic boom being hinged to the traveling platform, and the other end being detachably and fixedly connected to the welding device via the hook.

[0025] Optionally, it also includes:

[0026] A slewing device, one end of which is fixedly connected to the chassis of the railway rail welding equipment, and the other end of which is fixedly connected to the traveling platform, is used to drive the traveling platform to rotate around a vertical axis.

[0027] Optionally, it also includes a power system located on the traveling platform, the power system including a charger, a battery, an electrical control cabinet and a generator.

[0028] Optionally, it also includes:

[0029] A hydraulic system is located on the traveling platform and is connected to the dual-purpose road-rail traveling device, the hoisting device, the welding device, and the slewing device to provide hydraulic power.

[0030] The electrical system, located on the traveling platform, is connected to the dual-purpose road-rail traveling device, the hoisting device, and the welding device for electrical control.

[0031] The railway rail welding equipment provided in this application includes: a traveling platform and a welding device for welding turnouts; a hoisting device located on the traveling platform, with one end hinged to the traveling platform and the other end connected to the welding device, for lifting and moving the welding device; and an extension platform device for placing the welding device, located at the front along the longitudinal direction of the traveling platform, the extension platform device being able to move longitudinally and vertically relative to the traveling platform to cooperate with the hoisting device in lifting and repositioning the welding device.

[0032] The railway rail welding equipment provided in this application embodiment has the following technical advantages compared to the prior art:

[0033] In this application, an extension platform device is provided at the longitudinal front end of the traveling platform. This device can move directionally and vertically relative to the traveling platform, expanding the vertical distance and space between the device and the hoisting device. It works in conjunction with the hoisting device to lift and lower the welding device placed on the extension platform device, solving the problem that the hoisting device cannot directly lift the welding device due to height restrictions. The machine is highly adaptable, flexible in steering, has a simple pre-welding process, reduces manual labor intensity, and is highly safe. Attached Figure Description

[0034] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0035] Figure 1 A front view of a railway rail welding device provided in an embodiment of this application;

[0036] Figure 2 Rear view of a railway rail welding device provided in an embodiment of this application;

[0037] Figure 3 Axonometric drawing of railway rail welding equipment provided in an embodiment of this application;

[0038] Figure 4 This is an extended view of the telescopic guide column of the telescopic lifting mechanism for railway rail welding equipment provided in an embodiment of this application.

[0039] Figure 5 Views of the extension of the telescopic guide column, the descent of the lifting hydraulic outriggers, and the descent of the extension platform of the telescopic lifting mechanism for railway rail welding equipment provided in this embodiment of the application.

[0040] Figure 6 Preparatory work view for lifting the welding machine.

[0041] The following labels are shown in the attached diagram:

[0042] Railway rail welding equipment: 1. Traveling platform; 2. Welding device; 3. Lifting device; 4. Extension platform device; 5. Traveling steel wheel device; 6. Tracked traveling device; 7. Electrical system; 8. Rotation device; 9. Power system; 10. Hydraulic system; 11. Pipeline take-up and drop device; 12.

[0043] Extended platform 51, vertical moving component 52, longitudinal moving component 53;

[0044] Telescopic boom 41, hook 42. Detailed Implementation

[0045] This utility model discloses a railway rail welding equipment to solve the problem that existing railway rail welding equipment cannot be effectively hoisted and placed directly on the railway or at the work site due to height restrictions.

[0046] To make the technical solutions and advantages of the embodiments of this application clearer, the exemplary embodiments of this application will be described in further detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not an exhaustive list of all embodiments. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other.

[0047] Please see Figures 1-6 ,Figure 1 A front view of a railway rail welding device provided in an embodiment of this application; Figure 2 Rear view of a railway rail welding device provided in an embodiment of this application; Figure 3 Axonometric drawing of railway rail welding equipment provided in an embodiment of this application; Figure 4 This is an extended view of the telescopic guide column of the telescopic lifting mechanism for railway rail welding equipment provided in an embodiment of this application. Figure 5 Views of the extension of the telescopic guide column, the descent of the lifting hydraulic outriggers, and the descent of the extension platform of the telescopic lifting mechanism for railway rail welding equipment provided in this embodiment of the application. Figure 6 Preparatory work view for lifting the welding machine.

[0048] In one specific embodiment, the railway rail welding equipment 1 provided in this application includes a traveling platform 2, a chassis, a welding device 3, a hoisting device 4, an extension platform device 5, a dual-purpose (rail and road) traveling device, a slewing device 9, a pipeline deployment and retraction device 12, a power system 10, a hydraulic system 11, and an electrical system 8. The dual-purpose (rail and road) traveling device includes a traveling steel wheel device 6 and a crawler traveling device 7. The railway rail welding equipment 1 achieves switching between railway and road travel through the traveling steel wheel device 6 and the crawler traveling device 7, enabling the welding equipment to travel to positions such as inside turnouts, frogs between rails, and switch rails for rail welding, making it suitable for complex working conditions. The traveling platform 2 is equipped with a driver's cab, the power system 10, the hydraulic system 11, and the electrical system 8. The chassis and the dual-purpose (rail and road) traveling device are located at the bottom of the traveling platform 2. The dual-purpose (rail and road) traveling device is located on the chassis. A slewing device 9 is installed between the chassis and the traveling platform 2 to perform slewing movements, allowing the traveling platform 2 to rotate relative to the chassis and achieve flexible steering. The traveling platform 2 integrates the driver's cab, electrical room, power system 10, and hydraulic system 11. The hydraulic system 11 connects to the traveling steel wheel device 6, crawler traveling device 7, welding device 3, slewing device 9, and hoisting device 4 to provide hydraulic power. The electrical system 8 connects to the welding device 3, hoisting device 4, dual-purpose road-rail traveling device, power system 10, and hydraulic system 11 for electrical control. The hoisting device 4 is used to hoist the welding machine and provides auxiliary support for the entire machine on slopes or other harsh working conditions, improving its flexibility and off-road capability. The welding machine cable can be connected using an automatic cable reel-in / reel-out device 12 or by running the cable along the boom of the reel-in / reel-out device, using quick-connect couplings.

[0049] For railway operations, the top is usually a tunnel or has height restrictions, and the working space above is limited. Under height restrictions, the hoisting device 4 cannot directly hoist the welding device 3 on the traveling platform 2 or the work vehicle. Additional workers are needed to move the welding device 3 using other equipment. After moving it to a suitable location, the hoisting device 4 is used to hoist the welding device 3. This requires a large number of workers, resulting in high labor costs, high labor intensity, and reduced work efficiency.

[0050] To address the aforementioned technical issues, the travel platform 2 of this application is equipped with an extension platform device 5 at its front end. The extension platform device 5 is located at the front end along the direction of travel platform 2, with the direction of travel platform 2 being forward. The extension platform device 5 can extend and retract longitudinally relative to travel platform 2, and can also move vertically up and down. It works in conjunction with the hoisting device 4 to lift and lower the welding device 3 located on the extension platform device 5. It is understood that the hoisting device 4 is preferably located at the longitudinal front end of travel platform 2. When it is necessary to lift the welding device 3, the extension platform device 5 is controlled to move the welding device 3 longitudinally away from travel platform 2, stopping after moving a preset distance; and then the welding device 3 is moved vertically downwards. Thus, when the top of the hoisting device 4 cannot lift the welding device 3 high enough, by adjusting the relative position of the welding device 3, the hoisting device 4 can rotate or move downwards to lift the welding device 3.

[0051] It should be noted that the lifting device 4 includes a telescopic boom 41 and a hook 42. One end of the telescopic boom 41 is hinged to the traveling platform 2, and the other end is detachably and fixedly connected to the welding device 3 via the hook 42. The specific structure of the telescopic boom 41 and the hook 42 is a mature existing technology and will not be described in detail here.

[0052] Specifically, the extension platform device 5 includes an extension platform 51, a longitudinal moving component 53, and a vertical moving component 52. The extension platform 51 is fixed to the vertical moving platform component and moves vertically relative to the traveling platform 2 under the drive of the vertical moving component 52. The vertical moving component 52 is mounted on the longitudinal moving component 53 and moves vertically relative to the traveling platform 2 under the drive of the longitudinal moving component 53.

[0053] The vertical moving component 52 and the longitudinal moving component 53 can be configured as pneumatic cylinders, oil cylinders or hydraulic cylinders. The power unit can be configured as needed. The vertical moving component 52 is located on the longitudinal moving component 53. After the longitudinal moving component 53 moves forward a preset distance, it drives the extension platform 51 to move vertically to avoid electrical equipment, other structures of the road-rail dual-purpose traveling device.

[0054] Furthermore, the longitudinal moving component 53 includes a set of longitudinal telescopic members disposed laterally opposite each other on the traveling platform 2. Preferably, the two sets of longitudinal telescopic members are respectively disposed on the lateral sides of the traveling platform 2 and move longitudinally. Each set of longitudinal telescopic members includes a telescopic guide sleeve, a telescopic guide post, and a telescopic cylinder. The telescopic guide sleeve is fixed longitudinally on the traveling platform 2, the telescopic guide post is fitted inside the telescopic guide sleeve, and the telescopic cylinder is located inside the telescopic guide sleeve, with its two ends connected to the telescopic guide sleeve and the telescopic guide post respectively, so as to drive the telescopic guide post to move relative to the telescopic guide sleeve; thereby driving the extension platform 51 and the vertical moving component 52 to move longitudinally relative to the traveling platform 2. In other embodiments, the specific structure of the longitudinal telescopic members can be set as needed, all of which are within the protection scope of this application.

[0055] Furthermore, the vertical moving assembly 52 includes a set of vertical lifting components arranged laterally opposite to the longitudinal moving assembly 53. Each set of vertical lifting components includes a lifting guide sleeve, a lifting guide column, and a lifting cylinder. The lifting guide sleeve is fixed to the inner lateral side of the telescopic guide column. The lifting guide columns are fitted together. The extension platform 51 is fixed to the lifting guide column, and the lifting guide column is used to support the ground. The lifting cylinder is located inside the lifting guide sleeve, and its two ends are respectively connected to the lifting guide sleeve and the lifting guide column, used to drive the lifting guide column and the extension platform 51 to move vertically. At the same time, the lifting guide column moves vertically to contact the ground, used to support the ground, provide support force for the rail welding operation, reduce shaking during the operation, and improve stability.

[0056] The specific extension process of the extension platform 51 includes: when the railway rail welding equipment 1 arrives at the pre-laying position and needs to carry out rail welding operations, firstly, the longitudinal moving component 53 is driven to move forward longitudinally, driving the traveling platform 2 and the vertical moving component 52 on it to move longitudinally. Then, the vertical moving component 52 is driven to move downward vertically, while simultaneously driving the traveling platform 2, which is fixedly connected to the vertical moving component 52, to move downward, increasing the vertical distance and space between the traveling platform 2 and the hoisting device 4, providing extended space for the hoisting device 4 to hoist the welding device 3 on the traveling platform 2, so as to solve the problem that the hoisting device 4 does not have enough space to hoist the hoisting device 4 due to the height limit of the track or tunnel.

[0057] In this embodiment, the dual-purpose road-rail traveling device includes at least two sets of traveling steel wheel devices 6 and at least two sets of crawler traveling devices 7. Any one set of traveling steel wheel devices 6 is movably connected to the chassis and is used to drive the dual-purpose road-rail welding equipment to travel on the railway. The two sets of crawler traveling devices 7 are arranged side by side on both sides of the chassis and are used to drive the dual-purpose road-rail welding equipment to travel on the road. When the crawler traveling device 7 travels on the road, the traveling steel wheel devices 6 are raised to detach from the road surface. When the traveling steel wheel devices 6 travel on the railway, the traveling steel wheel devices 6 are lowered to support the rail surface and the crawler traveling device 7 is raised to detach from the road surface. In this embodiment, the switching between the tracked traveling device 7 and the traveling steel wheel device 6 can be achieved through a switching device. One end of the switching device is connected to the chassis, and the other end is connected to the traveling steel wheel device 6. This device is used to adjust the vertical position of the traveling steel wheel device 6 relative to the tracked traveling device 7. When the traveling steel wheel device 6 is lower than the tracked traveling device 7, it is in contact with the ground and travels on the rail surface. When the switching device moves the traveling steel wheel device 6 upwards, making it higher than the tracked traveling device 7, the tracked traveling device 7 is in contact with the ground and travels on the road surface. This achieves the switching between road and rail travel. The switching device can be specifically configured as a pneumatic cylinder or a hydraulic cylinder, and can be set according to existing technology, which will not be elaborated further here.

[0058] The slewing device 9 connects the chassis and the traveling platform 2. One end of the slewing device 9 is fixedly connected to the chassis, and the other end is fixedly connected to the traveling platform 2. It is used to drive the traveling platform 2 to rotate around the vertical axis to achieve the slewing action, so that the traveling platform 2 can rotate relative to the chassis, make flexible turns, and expand the working range of the equipment.

[0059] The specific operation process of the rail welding equipment is as follows:

[0060] S1: The railway rail welding equipment 1, using a crawler-driven self-propelled method, is assembled and driven into the pre-laying location along with the vehicle carrying turnout components;

[0061] S2: The railway rail welding equipment 1 travels on the track via a crawler, and then switches to traveling on steel wheels via a switching device to travel to the vicinity of the welding position;

[0062] S3: The boom of the hoisting device 4 is raised, the telescopic guide column of the longitudinal moving component 53 is extended, and after the telescopic guide column is in place, the lifting guide column is driven to fall to the ground to support the whole machine.

[0063] S4: The extension platform 51 is lowered vertically to a position where the welding machine can be lifted; the pipeline take-up and release device 12 releases the cable and connects to the welding machine cable; the fixing between the welding machine and the extension platform 51 is released;

[0064] S5: Lifting device 4 hook 42 lifts the welding machine to the welding rail for welding operations;

[0065] S6: After the welding operation is completed, lift the welding machine onto the extension platform 51 and fix it.

[0066] S7: The lifting guide column retracts, and the telescopic guide column retracts;

[0067] Operating Condition 1: Within the same set of turnouts:

[0068] If another welding point is not far away and there is a rail connection between the welding points, the railway rail welding equipment 1 travels to the next welding point by steel wheels and repeats the welding work in S3 to S7 (within the same set of turnouts);

[0069] Operating Condition 2: Multiple sets of turnouts laid out on the line:

[0070] If another welding point is slightly far away and there is no direct rail between the welding points, the railway rail welding equipment 1 switches to crawler mode via a switching device, and moves to the vicinity of the next welding position via crawler mode, repeating S2 to S7 to perform welding work (between turnouts).

[0071] S8: After welding is completed, lift the welding machine onto the extension platform 51 and fix it.

[0072] S9: The pipeline retraction device 12 automatically retracts the cable, the extension platform 51 retracts as the lifting guide column rises vertically, and the telescopic guide column retracts.

[0073] S11: Railway rail welding equipment 1 moves away from the work area.

[0074] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0075] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A railway rail welding equipment, characterized in that, include: Traveling platform and welding equipment for welding rails; A hoisting device is located on the traveling platform, with one end hinged to the traveling platform and the other end connected to the welding device, for lifting and moving the welding device; An extension platform device is used to place the welding device. It is located at the front end along the longitudinal direction of the traveling platform. The extension platform device can move longitudinally and vertically relative to the traveling platform to cooperate with the hoisting device to lift and lower the welding device.

2. The railway rail welding equipment according to claim 1, characterized in that, The extension platform device includes: An extension platform, a longitudinal moving component, and a vertical moving component are provided. The extension platform is fixed to the vertical moving component and moves vertically relative to the traveling platform under the drive of the vertical moving component. The vertical moving component is mounted on the longitudinal moving component and moves longitudinally relative to the traveling platform under the drive of the longitudinal moving component.

3. The railway rail welding equipment according to claim 2, characterized in that, The longitudinal movement assembly includes a set of longitudinal telescopic members disposed laterally opposite each other on the traveling platform, and any set of the longitudinal telescopic members includes: The system includes a telescopic guide sleeve, a telescopic guide post, and a telescopic hydraulic cylinder. The telescopic guide sleeve is fixed longitudinally to the traveling platform. The telescopic guide post is fitted inside the telescopic guide sleeve. The telescopic hydraulic cylinder is located inside the telescopic guide sleeve, and its two ends are respectively connected to the telescopic guide sleeve and the telescopic guide post to drive the telescopic guide post to move relative to the telescopic guide sleeve.

4. The railway rail welding equipment according to claim 3, characterized in that, The vertical moving assembly includes a set of vertical lifting members disposed laterally opposite to the longitudinal moving assembly, wherein any set of the vertical lifting members includes: A lifting guide sleeve, which is fixed to the inner lateral side of the telescopic guide column; A lifting guide column is fitted with a lifting guide sleeve; the extension platform is fixed to the lifting guide column, and the lifting guide column is used to support the ground; The lifting cylinder is located inside the lifting guide sleeve, and its two ends are respectively connected to the lifting guide sleeve and the lifting guide column, and is used to drive the lifting guide column and the extension platform to move vertically.

5. The railway rail welding equipment according to claim 4, characterized in that, The extension platform is located at the vertical bottom end of the lifting guide column.

6. The railway rail welding equipment according to claim 1, characterized in that, Also includes: A dual-purpose road-rail traveling device is located below the traveling platform and is used to drive the railway rail welding equipment to travel on the railway or highway. The dual-purpose road-rail running gear includes: At least two sets of traveling steel wheel devices, any one of which is movably connected to the chassis of the railway rail welding equipment, for driving the railway rail welding equipment to travel on the railway; At least two sets of tracked traveling devices are arranged side by side on both sides of the chassis of the railway rail welding equipment to drive the railway rail welding equipment to travel on the road. Specifically, when the tracked traveling device is traveling on a road, the traveling steel wheel device rises and leaves the road surface; when the traveling steel wheel device is traveling on a railway, the traveling steel wheel device lowers to support the rail surface and causes the tracked traveling device to rise and leave the road surface.

7. The railway rail welding equipment according to claim 1, characterized in that, The hoisting device includes a telescopic boom and a hook. One end of the telescopic boom is hinged to the traveling platform, and the other end is detachably fixedly connected to the welding device via the hook.

8. The railway rail welding equipment according to claim 6, characterized in that, Also includes: A slewing device, one end of which is fixedly connected to the chassis of the railway rail welding equipment, and the other end of which is fixedly connected to the traveling platform, is used to drive the traveling platform to rotate around a vertical axis.

9. The railway rail welding equipment according to claim 1, characterized in that, It also includes a power system located on the traveling platform, the power system comprising a charger, a battery, an electrical control cabinet, and a generator.

10. The railway rail welding equipment according to claim 8, characterized in that, Also includes: A hydraulic system is located on the traveling platform and is connected to the dual-purpose road-rail traveling device, the hoisting device, the welding device, and the slewing device to provide hydraulic power. The electrical system, located on the traveling platform, is connected to the dual-purpose road-rail traveling device, the hoisting device, and the welding device for electrical control.

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