Contact net wire welding device

Abstract

The invention provides an overhead line system wire welding device and belongs to the technical field of railway engineering. The device is provided with a lifting operation platform, the lifting operation platform comprises a working platform, the number of tensioning mechanisms is two, the tensioning mechanisms are symmetrically arranged on the working platform in the longitudinal direction of the working platform, and the tensioning mechanisms are used for tensioning and locking wires on the two sides of the contact network breaking point position; the welding machine assembly is supported on the working platform through the longitudinal moving mechanism, and the longitudinal moving mechanism enables the welding machine assembly to longitudinally move to a welding position; and the two sets of counter-pulling mechanisms are symmetrically arranged on the working platform in the longitudinal direction of the working platform, and the counter-pulling mechanisms are used for tensioning wires on the two sides of a welded contact net breaking point to carry out a counter-pulling test. According to the method, the contact net breakpoints are welded, so that the mechanical property and the electrical property of the contact net breakpoints are kept unchanged; in addition, the counter-pull mechanism is arranged to perform on-site counter-pull test on the welding spots, so that on-site evaluation of welding quality is realized, and the later use performance of the overhead line system wire is ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of railway engineering, and in particular relates to a contact network wire welding device. Background Art

[0002] The electrified railway overhead line is a special power supply line without backup. During operation, the overhead line may be disconnected due to excessive local wear, abnormal defects or some sudden accidents. At present, there are two solutions for the following treatment of overhead line breakage in China:

[0003] 1. Temporary wire clamp fixation and repair, low quality of bow-net current collection: The wire clamp connection method is essentially a physical connection, and there are safety hazards in terms of mechanical strength and electrical performance at the connection point, and it is easy to break the line again after long-term operation. In addition, due to the change in mass distribution at the connection point, stress concentration points are easily formed during the bow-net matching process, which in turn produces bow-net hard points and affects the quality of bow-net current collection.

[0004] 2. The overall anchor section conductor replacement construction is difficult and the operation and maintenance cost is high: At present, in the practice of high-speed railway traction power supply operation and maintenance management, the method to completely eliminate the conductor connection point is to replace the conductor in the entire anchor section. When the contact line is severely damaged or the line is broken, the wire clamp is first used to connect and adjust the line to resume operation, and then a skylight is arranged to replace the entire anchor section.

[0005] The above-mentioned treatment methods have the problems of easy breakage after repair, affecting the current-collecting quality of the bow net, complicated operation process of wire replacement, low replacement efficiency, high maintenance cost, and large consumption of manpower and material resources. Among them, the patent CN202122832980.X discloses an electrified railway contact network maintenance vehicle, which specifically discloses: the work platforms on both sides of the lifting work platform are provided with a wire tightening device for tightening and locking the wires at the position of the contact network break point, and the middle of the lifting work platform is provided with a wire welding device for welding the tightened contact network break point. After the two wires at the position of the contact network break point are tightened and positioned to the welding position on the lifting work platform, the wire welding device arranged in the middle of the lifting work platform is used for welding, which greatly improves the repair efficiency of the contact network, simplifies the repair process of the contact network wire break, and reduces the repair cost. Although the patent keeps the mechanical and electrical properties of the contact network break point unchanged by welding the contact network break point, saves labor costs, improves work efficiency and safety assurance, there is still a problem that the welding quality of the contact network break point cannot be evaluated on site, and the welding quality of the contact network break point cannot be guaranteed. Therefore, improvements are proposed. Summary of the invention

[0006] Technical problem solved by the present invention: The present invention is to provide a contact network conductor welding device in view of the deficiencies in the prior art, the purpose of which is not only to achieve the maintenance of mechanical and electrical properties of the contact network breakpoints by welding, thereby making up for the deficiencies of temporary wire clamp fixing and repairing and overall anchor section conductor replacement construction, but also to achieve on-site reverse pull test of welding points, realize on-site evaluation of welding quality, and ensure the later performance of the contact network conductor.

[0007] In order to achieve the above object, the technical solution adopted by the present invention is:

[0008] A contact wire welding device, comprising a lifting work platform, the lifting work platform comprising a working platform, the working platform being provided with a tensioning mechanism, a longitudinal movement mechanism, a welding machine assembly and a reverse pulling mechanism;

[0009] The tensioning mechanism is provided with two sets and is symmetrically arranged on the working platform along the longitudinal direction of the working platform. The tensioning mechanism is used to tighten and lock the wires on both sides of the contact network breaking point;

[0010] The welding machine assembly is supported on the working platform by a longitudinal movement mechanism, and the longitudinal movement mechanism enables the welding machine assembly to be longitudinally moved to the welding position and assists the welding machine to complete the welding operation on the tensioned contact wire breaking point;

[0011] The back-pull mechanism is provided with two sets and is symmetrically arranged on the working platform along the longitudinal direction of the working platform. The back-pull mechanism is used to tighten the wires on both sides of the fracture point of the contact network after welding to perform a back-pull test.

[0012] To further define the above scheme, each set of the anti-pull mechanism includes a anti-pull cylinder, an anti-pull rigging and a pulley assembly, and the two anti-pull cylinders in the two sets of the anti-pull mechanism are symmetrically installed on the lower plane of the working platform along the longitudinal direction of the working platform; support columns are provided at both longitudinal ends of the upper part of the working platform, and pulley assemblies are provided on the support columns, one end of the anti-pull rigging is connected to the anti-pull cylinder piston rod on the corresponding side, and the other end bypasses the pulley assembly at the corresponding end and is connected to the anti-pull wire clamp.

[0013] To further limit the above scheme, the upper and lower parts of the support column are provided with pulley assemblies for guiding the reverse-tensioning rigging, and the pulley assembly at the lower part guides the lower end of the reverse-tensioning reverse-tensioning rigging to be parallel to the axis of the reverse-tensioning cylinder, and the pulley assembly at the upper part guides the upper end of the reverse-tensioning reverse-tensioning rigging to be parallel to the wire.

[0014] To further define the above scheme, each set of the tensioning mechanism includes a tensioning cylinder, a tensioning rigging, a support limit assembly, and a roller assembly; the two tensioning cylinders in the two sets of the tensioning mechanisms are symmetrically arranged and installed along the longitudinal direction of the working platform, and a roller assembly is provided at the upper and lower parts of each of the support columns, and a support limit assembly is provided at the lower part of each of the support columns. One end of the tensioning rigging is connected to the corresponding tensioning cylinder piston rod, and the other end is connected to the tensioning wire clamp after being guided by the corresponding support limit assembly and the roller assembly on one side.

[0015] A further limitation of the above scheme is that when the tensioning rigging is tightened, its lower end is parallel to the axis of the tensioning cylinder piston rod on the corresponding side through the guidance of the support limit assembly, and when the tensioning rigging is tightened, its upper end is parallel to the tightened wire through the guidance of the roller assembly.

[0016] As a further limitation of the above solution, a cylinder protection cover is provided on the upper portion of the piston rod of the tensioning cylinder.

[0017] Further limiting the above solution, the longitudinal movement mechanism includes a guide rail support, a guide rail, a slider, a longitudinal movement chassis, a longitudinal movement cylinder and a locking mechanism;

[0018] The guide rail support is fixed on the middle part of the upper surface of the working platform, the guide rail is fixedly installed on the guide rail support, the slider is installed on the guide rail and can move along the direction of the guide rail, the longitudinal movement frame is fixedly installed on the slider, the piston rod of the longitudinal movement cylinder is connected with the longitudinal movement frame cylinder seat by a pin shaft, the longitudinal movement frame cylinder seat is fixedly connected with the longitudinal movement frame, the longitudinal movement cylinder barrel is connected with the longitudinal movement cylinder seat by a pin shaft, and the longitudinal movement cylinder seat is fixed on the working platform; the longitudinal movement cylinder is actuated to realize the movement of the longitudinal movement frame.

[0019] A further limitation of the above scheme is that the longitudinal moving chassis is locked by a locking mechanism after moving to the initial position; the locking mechanism includes a fixed seat and a positioning seat, the fixed seat is fixed on the outer wall of the long side of the longitudinal moving chassis, and the positioning seat is fixed on the middle side beam of the working platform. When the longitudinal moving chassis moves to the initial position, the fixed seat is coaxial with the through hole on the positioning seat and is connected by a mechanical locking pin shaft. An L-shaped seat is provided on the longitudinal moving chassis. When the longitudinal moving chassis is in a moving working state, the mechanical locking pin shaft is removed from the fixed seat and inserted and stored on the L-shaped seat.

[0020] To further define the above scheme, the welding machine assembly includes a welding machine and a scissor-type mechanism, the welding machine is mounted and fixed on the scissor-type mechanism, the scissor-type mechanism is mounted and fixed on the longitudinal movement chassis, and the scissor-type mechanism is used to assist the welding machine in adjusting the weld height.

[0021] As a further limitation of the above scheme, the lifting work platform further includes a lifting column, the lower part of the work platform is fixedly connected to the inner column of the lifting column, and the work platform can achieve lifting action under the action of the lifting column.

[0022] The advantages of the present invention compared with the prior art are:

[0023] 1. This scheme not only realizes the maintenance of mechanical and electrical properties of the contact network breakpoints by welding, thereby making up for the deficiencies of temporary wire clamp fixing and repair and overall anchor section conductor replacement construction, saving a lot of labor costs, and improving work efficiency and safety; but also conducts on-site back-pull tests on welding points by setting up back-pull mechanisms, scientifically and comprehensively verifies welding quality by back-pull tests, realizes on-site evaluation of welding quality, and ensures the later performance of contact network conductors.

[0024] 2. This solution realizes mechanical locking of the initial position of the longitudinal movement mechanism by setting a locking mechanism, providing reliable safety protection for transportation and driving;

[0025] 3. In this scheme, the contact network wire is flexibly connected to the tensioning and reverse pulling rigging through the wire clamp, and the wire tensioning is completed by the oil cylinder tensioning method. The overall structure is simple and easy to operate for construction workers;

[0026] 4. The entire construction process of this scheme has simple procedures, a high degree of mechanization and high use value. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural front view of the present invention;

[0028] Figure 2 It is a top view of the structure of the present invention;

[0029] Figure 3 For the present invention Figure 2 AA section view in the figure;

[0030] Figure 4 It is a structural schematic diagram of the lifting work platform in the present invention;

[0031] Figure 5 It is a schematic diagram of the installation structure of the tensioning mechanism of the present invention on the lifting work platform;

[0032] Figure 6 It is a schematic diagram of the installation structure of the tensioning rigging in the present invention;

[0033] Figure 7 It is a structural schematic diagram of the support and limit assembly in the present invention;

[0034] Figure 8 It is a structural schematic diagram of the longitudinal shift mechanism in the present invention;

[0035] Fig. 9 It is a structural schematic diagram of the locking structure in the present invention;

[0036] Fig.10 It is a structural schematic diagram of the welding machine assembly in the present invention;

[0037] Fig.11 It is a schematic diagram of the installation structure of the anti-pull mechanism on the lifting work platform in the present invention;

[0038] Fig.12 It is a schematic diagram of the installation structure of the counter-pull rigging in the present invention. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore, should not be understood as a limitation on the present invention.

[0041] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "includes a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0042] See also Figure 1-12 , details of the embodiments of the present invention.

[0043] Example: Figure 1-2 As shown, a contact wire welding device has a lifting work platform 1, the lifting work platform 1 includes a working platform 1-1, and the working platform 1-1 is provided with a tensioning mechanism 2, a longitudinal movement mechanism 3, a welding machine assembly 4 and a reverse pulling mechanism 5;

[0044] The tensioning mechanism 2 is provided with two sets and is symmetrically arranged on the working platform 1-1 along the longitudinal direction of the working platform 1-1. The tensioning mechanism 2 is used to tighten and lock the wires on both sides of the contact network breaking point;

[0045] The welding machine assembly 4 is supported on the working platform 1-1 by a longitudinal movement mechanism 3, and the longitudinal movement mechanism 3 enables the welding machine assembly 4 to be longitudinally moved to the welding position and assists the welding machine to complete the welding operation of the tensioned contact network breaking point;

[0046] The back-pull mechanism 5 is provided with two sets and is symmetrically arranged on the working platform 1-1 along the longitudinal direction of the working platform 1-1. The back-pull mechanism 5 is used to tighten the wires on both sides of the fracture point of the contact network after welding to perform a back-pull test.

[0047] In the above embodiment, during on-site construction, after the tensioning mechanism 2 pulls the wire to a suitable length, the longitudinal movement mechanism 3 moves the welding machine assembly 4 to the welding position to assist the welding machine in completing the wire breakpoint welding construction work, thereby reducing the labor intensity of on-site personnel and improving on-site operation efficiency. After welding is completed, in order to verify the welding quality, the wire is subjected to a back-pull test by the back-pull mechanism 5, providing a test basis for welding quality assessment. The entire construction operation process has a simple process, a high degree of mechanization, and a high use value.

[0048] In a specific embodiment: Figure 11-12 As shown, the specific structure of the anti-pull mechanism 5 is as follows: each set of the anti-pull mechanism 5 includes an anti-pull cylinder 5-1, an anti-pull rigging 5-2 and a pulley assembly 5-3, and the two anti-pull cylinders 5-1 in the two sets of the anti-pull mechanism 5 are symmetrically installed on the lower plane of the working platform 1-1 along the longitudinal direction of the working platform 1-1; support columns 6 are provided at both ends of the upper longitudinal part of the working platform 1-1, and pulley assemblies 5-3 are provided on the support columns 6. One end of the anti-pull rigging 5-2 is connected to the piston rod of the anti-pull cylinder 5-1 on the corresponding side, and the other end bypasses the pulley assembly 5-3 at the corresponding end and is connected to the anti-pull wire clamp 5-4.

[0049] Among them, the upper and lower parts of the supporting column 6 are both provided with pulley assemblies 5-3 for guiding the reverse-tensioning rigging 5-2. After the lower pulley assembly 5-3 is guided, the lower end of the reverse-tensioning reverse-tensioning rigging 5-2 is parallel to the axis of the reverse-tensioning cylinder 5-1, and after the upper pulley assembly 5-3 is guided, the upper end of the reverse-tensioning reverse-tensioning rigging 5-2 is parallel to the wire.

[0050] When the above-mentioned back-pull mechanism 5 is used, the back-pull wire clamp 5-4 is connected to the wire by manual operation, and the back-pull mechanism 5 performs a back-pull test on the welding point by synchronously contracting the back-pull oil cylinder 5-1 to verify the reliability of the welding quality. The entire construction operation process has simple procedures, high mechanization, and high use value.

[0051] In a specific embodiment: Figure 3 , 5 -7, the specific structure of the tensioning mechanism 2 is as follows: each set of the tensioning mechanism 2 includes a tensioning cylinder 2-1, a tensioning rigging 2-2, a support and limit assembly 2-3, and a roller assembly 2-4; the two tensioning cylinders 2-1 in the two sets of the tensioning mechanisms 2 are symmetrically arranged and installed along the longitudinal direction of the working platform 1-1, and the upper and lower parts of each of the support columns 6 are provided with a roller assembly 2-4, and the lower part of each of the support columns 6 is provided with a support and limit assembly 2-3, and one end of the tensioning rigging 2-2 is connected to the corresponding tensioning cylinder 2-1 piston rod, and the other end is connected to the tensioning wire clamp 2-6 after being guided by the corresponding support and limit assembly 2-3 and the roller assembly 2-4. In this structure, the tensioning mechanism can be replaced by a winch mechanism.

[0052] In this embodiment, preferably, when the tensioning rigging 2-2 is tightened, its lower end is parallel to the piston rod axis of the tensioning cylinder 2-1 on the corresponding side through the guidance of the support limit assembly 2-3, and when the tensioning rigging 2-2 is tightened, its upper end is parallel to the tightened wire through the guidance of the roller assembly 2-4.

[0053] In this embodiment, preferably, a cylinder protection cover 2-5 is provided on the upper portion of the piston rod of the tensioning cylinder 2-1.

[0054] When the tensioning mechanism 2 is in use: the tensioning wire clamp 2-6 is connected to the wire through manual operation, the tensioning mechanism 2 pulls the wire out to a suitable length through the synchronous contraction of the tensioning cylinder 2-1, the support limit assembly 2-3 is installed on the support column 6 to prevent the piston rod of the tensioning cylinder 2-1 from being subjected to lateral unbalanced load and leakage, the roller assembly 2-4 is installed on the support column 6 to guide the tensioning rigging 2-2; the cylinder protection cover 2-5 is symmetrically arranged on the upper part of the piston rod of the tensioning cylinder 2-1 to prevent the tensioning rigging 2-2 from breaking and causing personal injury to the operator, and has a safety protection function.

[0055] In a specific embodiment: Figure 8As shown, the specific structure of the longitudinal movement mechanism 3 is as follows: the longitudinal movement mechanism 3 includes a guide rail support 3-1, a guide rail 3-2, a slider 3-3, a longitudinal movement frame 3-4, a longitudinal movement cylinder 3-5 and a locking mechanism 3-8; the guide rail support 3-1 is fixed to the middle part of the upper surface of the working platform 1-1, the guide rail 3-2 is fixedly mounted on the guide rail support 3-1, the slider 3-3 is mounted on the guide rail 3-2 and can move along the guide rail direction, the longitudinal movement frame 3-4 is fixedly mounted on the slider 3-3, the piston rod of the longitudinal movement cylinder 3-5 is connected to the longitudinal movement frame cylinder seat 3-6 through a pin shaft, the longitudinal movement frame cylinder seat 3-6 is fixedly connected to the longitudinal movement frame 3-4, the cylinder barrel of the longitudinal movement cylinder 3-5 is connected to the longitudinal movement cylinder seat 3-7 through a pin shaft, and the longitudinal movement cylinder seat 3-7 is fixed on the working platform 1-1; the longitudinal movement cylinder 3-5 is actuated to realize the movement of the longitudinal movement frame 3-4 to the welding position.

[0056] Specifically, the longitudinally movable chassis 3-4 is moved to the initial position and locked by the locking mechanism 3-8; Fig. 9 As shown, the locking mechanism 3-8 includes a fixed seat 3-8-1 and a positioning seat 3-8-2. The fixed seat 3-8-1 is fixed on the outer wall of the long side of the longitudinal moving chassis 3-4, and the positioning seat 3-8-2 is fixed on the side beam in the middle of the working platform 1-1. When the longitudinal moving chassis 3-4 moves to the initial position, the fixed seat 3-8-1 is coaxial with the through hole on the positioning seat 3-8-2 and is plugged in and connected by a mechanical locking pin shaft 3-8-3, so as to achieve mechanical locking of the initial position of the longitudinal moving mechanism. The longitudinal moving chassis 3-4 is provided with an L-shaped seat 3-8-4. When the longitudinal moving chassis 3-4 is in a moving working state, the mechanical locking pin shaft 3-8-3 is removed from the fixed seat 3-8-1 and plugged in and stored on the L-shaped seat 3-8-4.

[0057] In the above structure, the locking mechanism is provided to achieve mechanical locking of the initial position of the longitudinal movement mechanism, thereby providing reliable safety protection for transportation and driving.

[0058] In a specific embodiment: Fig.10 As shown, the specific structure of the welding machine assembly 4 is as follows: the welding machine assembly 4 includes a welding machine 4-1 and a scissor-type mechanism 4-2, the welding machine 4-1 is installed and fixed on the scissor-type mechanism 4-2, the scissor-type mechanism 4-2 is installed and fixed on the longitudinal moving chassis 3-4, and the scissor-type mechanism 4-2 is used to assist the welding machine 4-1 to adjust the weld height and complete the wire breakpoint welding construction operation.

[0059] In a specific embodiment: Figure 3As shown, the specific structure of the lifting work platform 1 is as follows: the lifting work platform 1 also includes a lifting column 1-2, the lower part of the working platform 1-1 is fixedly connected to the inner column of the lifting column 1-2, the working platform 1-1 is the main load-bearing component, and the working platform 1-1 can realize lifting action under the action of the lifting column 1-2.

[0060] The present invention integrates the tensioning mechanism, the reverse pulling mechanism, the longitudinal moving mechanism and the welding machine assembly on the lifting work platform, which not only realizes that after the tensioning mechanism pulls the wire out to a suitable length at the work site, the longitudinal moving mechanism moves the welding machine assembly to the welding position, assists the welding machine to complete the wire breakpoint welding construction work, reduces the labor intensity of the on-site personnel, and improves the on-site operation efficiency, but also can perform on-site reverse pulling tests through the reverse pulling mechanism, providing a test basis for welding quality assessment. The entire construction operation process has simple procedures, a high degree of mechanization, and high use value.

[0061] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0062] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A contact wire welding device, comprising a lifting work platform (1), wherein the lifting work platform (1) comprises a working platform (1-1), Features: The working platform (1-1) is provided with a tensioning mechanism (2), a longitudinal movement mechanism (3), a welding machine assembly (4) and a reverse pulling mechanism (5); The tensioning mechanism (2) is provided with two sets and is symmetrically arranged on the working platform (1-1) along the longitudinal direction of the working platform (1-1), and the tensioning mechanism (2) is used to tighten and lock the conductors on both sides of the contact network breaking point; The welding machine assembly (4) is supported on the working platform (1-1) by a longitudinal movement mechanism (3), and the longitudinal movement mechanism (3) enables the welding machine assembly (4) to move longitudinally to a welding position and assists the welding machine to complete the welding operation on the tensioned contact network breaking point; The back-pull mechanism (5) is provided with two sets and is symmetrically arranged on the working platform (1-1) along the longitudinal direction of the working platform (1-1). The back-pull mechanism (5) is used to tighten the wires on both sides of the fracture point of the contact network after welding to perform a back-pull test; The lifting work platform (1) further comprises a lifting column (1-2); the lower part of the working platform (1-1) is fixedly connected to the inner column of the lifting column (1-2); and the working platform (1-1) can achieve lifting action under the action of the lifting column (1-2).

2. A contact wire welding device according to claim 1, Features: Each set of the reverse pulling mechanism (5) comprises a reverse pulling cylinder (5-1), a reverse pulling rigging (5-2) and a pulley assembly (5-3); the two reverse pulling cylinders (5-1) in the two sets of the reverse pulling mechanism (5) are symmetrically installed on the lower plane of the working platform (1-1) along the longitudinal direction of the working platform (1-1); support columns (6) are provided at both ends of the upper longitudinal part of the working platform (1-1), and pulley assemblies (5-3) are provided on the support columns (6); one end of the reverse pulling rigging (5-2) is connected to the piston rod of the reverse pulling cylinder (5-1) on the corresponding side, and the other end bypasses the pulley assembly (5-3) at the corresponding end and is connected to the reverse pulling wire clamp (5-4).

3. A contact wire welding device according to claim 2, Features: The upper and lower parts of the support column (6) are both provided with pulley assemblies (5-3) for guiding the reverse-tensioning rigging (5-2). After the lower pulley assembly (5-3) guides, the lower end of the reverse-tensioning rigging (5-2) is parallel to the axis of the reverse-tensioning cylinder (5-1), and after the upper pulley assembly (5-3) guides, the upper end of the reverse-tensioning rigging (5-2) is parallel to the wire.

4. A contact wire welding device according to claim 2, Features: Each set of the tensioning mechanism (2) comprises a tensioning cylinder (2-1), a tensioning rigging (2-2), a support and limit assembly (2-3), and a roller assembly (2-4); the two tensioning cylinders (2-1) in the two sets of the tensioning mechanisms (2) are symmetrically arranged and installed along the longitudinal direction of the working platform (1-1); the upper and lower parts of each support column (6) are provided with a roller assembly (2-4); the lower part of each support column (6) is provided with a support and limit assembly (2-3); one end of the tensioning rigging (2-2) is connected to the piston rod of the corresponding tensioning cylinder (2-1); the other end is connected to the tensioning wire clamp (2-6) after being guided by the corresponding support and limit assembly (2-3) and the roller assembly (2-4).

5. A contact wire welding device according to claim 4, Features: When the tensioning rigging (2-2) is tightened, its lower end is parallel to the piston rod axis of the tensioning oil cylinder (2-1) on the corresponding side through the guidance of the support limit assembly (2-3); when the tensioning rigging (2-2) is tightened, its upper end is parallel to the tightened wire through the guidance of the roller assembly (2-4).

6. A contact wire welding device according to claim 4, Features: A cylinder protection cover (2-5) is provided on the upper part of the piston rod of the tensioning oil cylinder (2-1).

7. A contact wire welding device according to claim 1, Features: The longitudinal movement mechanism (3) comprises a guide rail support (3-1), a guide rail (3-2), a slide block (3-3), a longitudinal movement chassis (3-4), a longitudinal movement cylinder (3-5) and a locking mechanism (3-8); The guide rail support (3-1) is fixed to the middle part of the upper surface of the working platform (1-1); the guide rail (3-2) is fixedly mounted on the guide rail support (3-1); the slider (3-3) is mounted on the guide rail (3-2) and can move along the guide rail direction; the longitudinal movement frame (3-4) is fixedly mounted on the slider (3-3); the piston rod of the longitudinal movement cylinder (3-5) is connected to the longitudinal movement frame cylinder seat (3-6) through a pin shaft; the longitudinal movement frame cylinder seat (3-6) is fixedly connected to the longitudinal movement frame (3-4); the cylinder barrel of the longitudinal movement cylinder (3-5) is connected to the longitudinal movement cylinder seat (3-7) through a pin shaft; the longitudinal movement cylinder seat (3-7) is fixed on the working platform (1-1); the longitudinal movement cylinder (3-5) moves to realize the movement of the longitudinal movement frame (3-4).

8. A contact wire welding device according to claim 7, Features: After the longitudinal moving chassis (3-4) moves to the initial position, it is locked by a locking mechanism (3-8); the locking mechanism (3-8) comprises a fixed seat (3-8-1) and a positioning seat (3-8-2); the fixed seat (3-8-1) is fixed on the outer wall of the long side of the longitudinal moving chassis (3-4); the positioning seat (3-8-2) is fixed on the middle side beam of the working platform (1-1); when the longitudinal moving chassis (3-4) moves to the initial position, the fixed seat (3-8-1) is coaxial with the through hole on the positioning seat (3-8-2) and is plugged and connected by a mechanical locking pin shaft (3-8-3); an L-shaped seat (3-8-4) is provided on the longitudinal moving chassis (3-4); when the longitudinal moving chassis (3-4) is in a moving working state, the mechanical locking pin shaft (3-8-3) is removed from the fixed seat (3-8-1) and plugged and stored on the L-shaped seat (3-8-4).

9. A contact wire welding device according to claim 7, Features: The welding machine assembly (4) comprises a welding machine (4-1) and a scissor mechanism (4-2); the welding machine (4-1) is mounted and fixed on the scissor mechanism (4-2); the scissor mechanism (4-2) is mounted and fixed on a longitudinally movable chassis (3-4); and the scissor mechanism (4-2) is used to assist the welding machine (4-1) in adjusting the height of a weld.

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