Anti-deformation mirror image rotating welding device for contact net ratchet connecting frame

Abstract

This utility model belongs to the field of contact wire technology, specifically relating to a contact wire ratchet connecting frame anti-deformation mirror rotation welding device, including a base, a pressure frame, and a rotation drive mechanism for driving the base to rotate; the base includes a first limiting structure for supporting and limiting a U-shaped hanging plate, a second limiting structure for supporting and limiting a steel pipe, a third limiting structure for limiting a support plate, and a fourth limiting structure for limiting the horizontal tube of the connecting frame; the pressure frame is equipped with a pressure plate assembly for pressing down the upper and lower stiffening plates; this utility model uses the first limiting structure, the second limiting structure, the third limiting structure, the fourth limiting structure, and the pressure plate assembly to fix the ratchet connecting frame, and uses the rotation drive mechanism to compensate for the blind spot during welding, achieving integrated welding without dead angles, and can achieve synchronous symmetrical welding on both sides, avoiding dimensional errors caused by displacement due to welding on one side.

Description

Technical Field

[0001] This utility model belongs to the field of contact wire technology, specifically relating to a contact wire ratchet connecting frame anti-deformation mirror rotation welding device. Background Technology

[0002] The ratchet connecting frame is a key component in the ratchet compensation device. It serves to fix the ratchet connecting frame base and prevent the weight from falling and damaging the track due to the breakage of the cable. Therefore, the support plate is required to have sufficient strength to withstand the instantaneous impact force. As a result, strict quality requirements are imposed on the welding process of the ratchet connecting frame. Its welding quality directly affects the braking effect of the ratchet compensation device and the safety performance of the contact wire system. Currently, ratchet connecting frames in China are mainly welded manually. Manual welding relies on the welder's skills and experience, and has a significant impact on the welder's health. It also has low welding efficiency, difficulty in controlling weld quality, and the traditional manual welding process often results in shrinkage and deformation during welding, such as causing the lower stiffening plate to deflect at an angle with the seamless steel pipe. Manual welding is also time-consuming, and the weld cooling and solidification can make the product uncorrectable. Therefore, it is necessary to develop automatic welding technology for ratchet connecting frames. Since the ratchet connecting frame is composed of multiple parts such as a U-shaped hanging plate, seamless steel pipe, upper stiffening plate, lower stiffening plate, support plate, and connecting frame horizontal tube, and the whole structure is symmetrical, the positioning requirements of each component are high during the automatic welding process, and some welding positions are difficult to reach with welding robotic arms. Utility Model Content

[0003] The technical problem to be solved by this utility model is: in order to solve the problem that the positioning accuracy of the ratchet connecting frame is not high and some welding positions are difficult to reach in the existing technology, a contact wire ratchet connecting frame anti-deformation mirror rotation welding device is provided.

[0004] The technical solution adopted by this utility model to solve its technical problem is: a contact wire ratchet connecting frame anti-deformation mirror rotation welding device, wherein the ratchet connecting frame includes a steel pipe, a support plate connected to the middle of the steel pipe, an upper stiffening plate disposed between the upper surface of the support plate and the steel pipe, a lower stiffening plate disposed between the lower surface of the support plate and the steel pipe, a U-shaped hanging plate fixed to the end of the steel pipe, and a connecting frame horizontal tube connected between the U-shaped hanging plate and the upper stiffening plate. The welding device is used to clamp and fix the ratchet connecting frame and then perform welding. The welding device includes a base, a pressure frame hinged to the base, and a rotation drive mechanism for driving the base to rotate. A clamping space for clamping the ratchet connecting frame is formed between the base and the pressure frame. The base includes a first limiting structure for supporting and limiting the U-shaped hanging plate, a second limiting structure for supporting and limiting the steel pipe, a third limiting structure for limiting the support plate, and a fourth limiting structure for limiting the horizontal tube of the connecting frame. The pressure frame is equipped with a pressure plate assembly for pressing down the upper and lower stiffening plates. When the pressure frame rotates and presses down to fix the upper and lower stiffening plates, the pressure frame is locked by the second limiting structure.

[0005] Furthermore, the first limiting structure includes a first bracket with a V-shaped groove and a limiting plate protruding from one end of the first bracket to laterally limit the U-shaped hanging plate.

[0006] Furthermore, the second limiting structure includes several second brackets with V-shaped grooves, fixed top rods and movable top rods disposed at both ends of the second brackets in the lateral direction, wherein the fixed top rods and movable top rods are inserted into the steel pipe to clamp the steel pipe.

[0007] Furthermore, the third limiting structure includes limiting posts distributed on both sides of the support plate in the longitudinal direction to clamp and limit its longitudinal movement, and the limiting posts are formed with limiting steps for abutting against the support plate to limit its lateral movement.

[0008] Furthermore, the fourth limiting structure includes movable top columns distributed at both ends of the longitudinal direction of the connecting frame horizontal tube, movable seats for mounting the movable top columns, and a longitudinal movement drive mechanism for driving the movable seats to reciprocate longitudinally to limit the longitudinal direction of the connecting frame horizontal tube.

[0009] Furthermore, the pressure plate assembly includes multiple pairs of pressure plates, with a clamping cavity formed between the two pressure plates in each pair for clamping the upper or lower stiffening plate.

[0010] Furthermore, the pressure plate assembly also includes a set screw that passes through the pressure plate and is used to press against the upper or lower stiffening plate.

[0011] Furthermore, it also includes two welding robots, which are positioned on either side of the base along its longitudinal direction.

[0012] Furthermore, the rotary drive mechanism includes a linear reciprocating drive mechanism, a rack connected to the output end of the linear reciprocating drive mechanism, an outer ring meshing with the rack, and an inner ring lining the outer ring, wherein the outer ring is fixed to the base.

[0013] Furthermore, the fixed top rod is fixed on the fixed column, the movable top rod is fixed on the movable column, the movable column is connected to the output end of the transverse drive mechanism, one end of the pressure frame is a hinged end that is hinged to the fixed column, and the other end is a free end; The movable column is equipped with two clamping plates on both sides along its longitudinal direction. The two clamping plates and the blocking part formed by the protrusion at the top of the movable column form a locking cavity for the free end to be inserted and locked.

[0014] The beneficial effects of this utility model are as follows: This utility model uses the first limiting structure, the second limiting structure, the third limiting structure and the fourth limiting structure to position the U-shaped hanging plate, the steel pipe, the support plate and the connecting frame horizontal pipe respectively. The second limiting structure can lock the pressure plate assembly to fix the upper stiffening plate and the lower stiffening plate. In addition, the rotation drive mechanism compensates for the blind spot during welding, realizes integrated welding without dead angles, and can realize synchronous symmetrical welding on both sides, which can avoid dimensional errors caused by displacement due to welding on one side.

[0015] Other features and advantages of this application will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0017] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the ratchet connecting frame in this utility model; Figure 3 This is a three-dimensional schematic diagram from the first perspective after the ratchet connecting bracket of this utility model is clamped. Figure 4 This is a three-dimensional schematic diagram from a second perspective after the ratchet connecting bracket of this utility model has been clamped. Figure 5 This is a front view of the ratchet connecting bracket of this utility model after it has been clamped. Figure 6 This is a three-dimensional schematic diagram of the pressure frame of this utility model before it is pressed down; Figure 7 This is a front view of the pressure frame of this utility model before it is pressed down; Figure 8 This is a three-dimensional schematic diagram of the ratchet connecting frame of this utility model before it is clamped. Figure 9 This is a front view of the ratchet connecting bracket of this utility model before it is clamped. Figure 10 This is a schematic diagram of the rotary drive mechanism in this utility model; In the picture: 1. Ratchet connecting frame; 101. Steel pipe; 102. Support plate; 103. Upper stiffening plate; 104. Lower stiffening plate; 105. U-shaped hanging plate; 106. Connecting frame horizontal pipe; 2. Base; 201. First bracket; 202. Limiting plate; 203. Second bracket; 204. Fixed top rod; 205. Movable top rod; 206. Limiting column; 2061. Limiting step; 207. Movable top column; 208. Movable seat; 209. Longitudinal movement drive mechanism; 210. Fixed column; 211. Movable column; 212. Lateral movement drive mechanism; 213. Clamping plate; 214. Blocking part; 215. Roller; 3. Pressure frame; 301. Pressure plate; 302. Set screw; 303. Hinge end; 304. Free end; 4. Rotary drive mechanism; 401. Linear reciprocating drive mechanism; 402. Rack; 403. Outer ring; 404. Inner ring; 405. Outer cover; 406. Base plate; 5. Welding robots. Detailed Implementation

[0018] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention. Therefore, they only show the components, orientations, and references (e.g., up, down, left, right, etc.) relevant to the present invention and are intended only to aid in the description of the features in the drawings. Therefore, the following specific embodiments are not intended to be restrictive, and the scope of the claimed subject matter is defined solely by the appended claims and their equivalents.

[0019] A contact wire ratchet connecting frame anti-deformation mirror rotation welding device, such as Figure 2 As shown, the ratchet connecting frame 1 includes a steel pipe 101, a support plate 102 connected to the middle of the steel pipe 101, an upper stiffening plate 103 disposed between the upper end face of the support plate 102 and the steel pipe 101, a lower stiffening plate 104 disposed between the lower end face of the support plate 102 and the steel pipe 101, a U-shaped hanging plate 105 fixed to the end of the steel pipe 101, and a connecting frame horizontal tube 106 connected between the U-shaped hanging plate 105 and the upper stiffening plate 103. The connecting frame horizontal tube 106 passes through the open end of the U-shaped hanging plate 105 and is fixed to the upper end face of the upper stiffening plate 103. The welding device is used to clamp and fix the ratchet connecting frame 1 and then perform welding. like Figure 1 , Figures 3-9 As shown, the welding device includes a base 2, a pressure frame 3 hinged to the base 2, and a rotary drive mechanism 4 for driving the base 2 to rotate. A clamping space for clamping the ratchet connecting frame 1 is formed between the base 2 and the pressure frame 3. Because the ratchet connecting frame 1 has a complex shape and many blind spots during welding, the working range is also limited. In order to make up for the blind spots during welding, the welding device has a certain spatial turning capability. When the welding requirements cannot be met, the base 2 can drive the pressure frame 3 to rotate ±90° to move the unwelded part into the working area and continue the welding operation. The welding points of the ratchet connecting frame 1 can be fully welded by the rotation drive mechanism 4.

[0020] The base 2 includes a first limiting structure for supporting and limiting the U-shaped hanging plate 105, a second limiting structure for supporting and limiting the steel pipe 101, a third limiting structure for limiting the support plate 102, and a fourth limiting structure for limiting the connecting frame horizontal tube 106. The pressure frame 3 is equipped with a pressure plate assembly for pressing down the upper stiffening plate 103 and the lower stiffening plate 104. When the pressure frame 3 rotates and presses down to fix the upper stiffening plate 103 and the lower stiffening plate 104, the pressure frame 3 is locked by the second limiting structure. During welding, the U-shaped hanging plate 105 is first fixed by the first limiting structure, then the connecting frame horizontal tube 106 is inserted and fixed by the fourth limiting structure. Next, the support plate 102 is inserted into the steel pipe 101 to form an assembly, and the assembly is fixed by the second and third limiting structures. Then, the upper stiffening plate 103 and the lower stiffening plate 104 are placed in, and finally the pressure frame 3 is rotated down to fix the upper stiffening plate 103 and the lower stiffening plate 104. At the same time, the pressure frame 3 is locked by the second limiting structure. At this time, the clamping is completed and welding is carried out. During the welding process, the base 2 and the pressure frame 3 are rotated by the rotation drive mechanism 4 to make up for the blind spot during welding and realize integrated welding without dead angles.

[0021] In some examples, the first limiting structure includes a first bracket 201 with a V-shaped groove and a limiting plate 202 protruding from one end of the first bracket 201 to laterally limit the U-shaped hanging plate 105. The first bracket 201 includes two symmetrically arranged half-brackets, which are spaced apart and have the aforementioned V-shaped groove between them. Each half-bracket has several rollers on its supporting surface. The limiting plate 202 is integrally formed with the first bracket 201 or fixed with bolts. The U-shaped hanging plate 105 is placed into the V-shaped groove of the first bracket 201 and abuts against the limiting plate 202. The limiting plate 202 can restrict the degree of freedom of the U-shaped hanging plate 105 to move backward.

[0022] In some examples, the second limiting structure includes several second brackets 203 with V-shaped grooves, fixed top rods 204 and movable top rods 205 disposed at both ends of the second brackets 203 in the transverse direction (i.e., in the direction of the axial direction of the steel pipe 101). The fixed top rods 204 and movable top rods 205 are inserted into the steel pipe 101. The number of second brackets 203 may be, but is not limited to, one, two or three, and they are spaced apart along the axial direction of the steel pipe 101. The fixed top rods 204 and movable top rods 205 at both ends clamp the steel pipe 101 between them.

[0023] In some examples, the third limiting structure includes limiting posts 206 distributed on both sides of the longitudinal direction of the support plate 102 to clamp and limit its longitudinal movement, and each limiting post 206 is formed with a limiting step 2061 for abutting against the support plate 102 to limit its lateral movement; first, the support plate 102 is fitted over the steel pipe 101 to form an assembly, and then the assembly is placed into the welding device. While the second limiting structure fixes the steel pipe 101, the two symmetrically distributed limiting posts 206 clamp the support plate 102, and the limiting step 2061 abuts against the support plate 102 to restrict its degree of freedom of backward movement.

[0024] In some examples, the fourth limiting structure includes movable top posts 207 distributed at both ends of the longitudinal direction (i.e., the axial direction of the connecting frame horizontal tube 106), movable seats 208 for mounting the movable top posts 207, and a longitudinal movement drive mechanism 209 for driving the movable seats 208 to reciprocate longitudinally to limit the longitudinal direction of the connecting frame horizontal tube 106. The longitudinal movement drive mechanism 209 may be, but is not limited to, a cylinder, a clamp, etc. In this embodiment, one of the longitudinal movement drive mechanisms 209 is a cylinder, and the other longitudinal movement drive mechanism 209 is a... The connecting frame horizontal tube 106 is a side elbow clamp. After passing through the U-shaped hanging plate 105, the movable top columns 207 at both ends of the connecting frame horizontal tube 106 are clamped and fixed by the longitudinal movement drive mechanism 209. Each movable seat 208 is equipped with two movable top columns 207. One movable top column 207 is used to support the connecting frame horizontal tube 106, and the other movable top column 207 is used to support the U-shaped hanging plate 105. During the positioning of the U-shaped hanging plate 105 by the movable top column 207, the rollers 215 on the first bracket 201 achieve rapid positioning.

[0025] In some examples, the pressure plate assembly includes multiple pairs of pressure plates 301, with a clamping cavity formed between the two pressure plates 301 in each pair for clamping the upper stiffener 103 or the lower stiffener 104. When the pressure frame 3 rotates and presses down, the upper stiffener 103 or the lower stiffener 104 is engaged into its corresponding clamping cavity and thus fixed.

[0026] In some examples, the pressure plate assembly further includes a set screw 302 passing through the pressure plate 301 and used to abut against the upper stiffener 103 or the lower stiffener 104. The number of set screws 302 corresponding to each pressure plate 301 may be, but is not limited to, one, two or three, etc. The set screws 302 are threadedly connected to the pressure plate 301 and their heads abut against the upper stiffener 103 or the lower stiffener 104 to assist in fixing it.

[0027] In some examples, two welding robots 5 are also included, distributed on both sides of the base 2 longitudinally. These are six-axis automated welding robots. To obtain relatively stable weld quality, spot welding is necessary to fix the entire ratchet connecting frame 1. The choice of welding sequence is also crucial to reduce deformation during the welding process. To minimize the impact of welding deformation, symmetrical mirror welding is preferred, as it provides some compensation during the welding process. Spot welding facilitates the fixation of the entire ratchet connecting frame 1, while mirror welding utilizes the deformation that occurs during welding to symmetrically offset it, controlling the tolerance caused by welding deformation to within ±0.5mm.

[0028] After clamping the workpiece, the robot first performs spot welding on key parts to improve the deformation resistance of the frame structure and improve the welding quality. First, the U-shaped hanging plate 105 is spot welded to the steel pipe 101 (welding point A). Then, the lower stiffening plate 104 is spot welded to the steel pipe 101 and the support plate 102 (welding points G and F). The support plate 102 is spot welded to the upper stiffening plate 103 (welding point E). The upper stiffening plate 103 is spot welded to the steel pipe 101 and the connecting frame horizontal pipe 106 (welding points C and B). The U-shaped hanging plate 105 is spot welded to the connecting frame horizontal pipe 106 (welding point D). All of the above welding is symmetrical mirror spot welding. After spot welding, symmetrical mirror repair welding is performed on the entire surface.

[0029] The welding process employs a dual-station operation, namely station 1 and station 2. Manual loading and unloading are synchronized with robot welding. When the equipment is running normally, the robot welding is a continuous action, welding uninterruptedly at station 1 and station 2. Operators only need to clamp or remove the workpiece at station 1 and station 2.

[0030] Because the ratchet connecting frame 1 needs to withstand significant impact forces, the mechanical properties of the weld are required to be high. Basic welding electrodes have weak oxidizing properties and less alloy element loss, resulting in good mechanical properties of the weld; therefore, basic welding electrodes are selected for welding. However, the welding arc is not stable enough when using basic welding electrodes, so DC reverse polarity is used during welding, connecting the workpiece to the negative electrode.

[0031] As welding current and voltage increase, the heat received by the weldment increases, resulting in greater product deformation. Therefore, while meeting welding quality requirements, the minimum welding parameters should be selected. The optimal welding parameter scheme should be chosen during trial production.

[0032] Excessive wire feed speed can cause incomplete penetration at the weld joint, affecting the workpiece's strength. Excessive current generates excessive heat during welding, impacting product forming quality and causing slag inclusions. Excessive voltage can easily cause undercut, affecting the workpiece's surface quality. Too fast a wire feed speed can lead to delayed wire feeding and incomplete welding, resulting in missed welds and incomplete workpiece welding. When the wire feed is too slow and the current is too high, obvious undercut, uneven weld, and porosity will appear in the weld.

[0033] The ratchet connecting frame 1 has a plate thickness of 16mm. When the plate thickness is greater than 13mm, the electrode diameter should be 4-6mm. According to the welding current formula I=K×d (d-electrode diameter in mm, K-empirical coefficient), when the electrode diameter d is 4~6, the empirical coefficient K is 40~50. Substituting this into the range of welding wire diameters, the theoretical welding current should be between 160-300A. According to the commonly used automatic welding voltage formula, when the current < 600A, the voltage = 20 + 0.04I.

[0034] Final parameter settings: Current: 190~220A; Voltage: 28V; Speed: 20cm / min; Gas flow rate: 10~15L / min.

[0035] An automated welding process for the ratchet connector 1 was successfully developed and industrialized in the workshop. All performance indicators of the automatically welded ratchet connector 1 meet national industry standards. The production efficiency of the ratchet connector 1 welding unit increased by 100%. Weld inspection of the parts meets the requirements for Class III welded joints in GB / T3323-2005; the weld height is consistently greater than 6mm; the ratchet connector 1 has no visible defects such as incomplete welds, undercut, or porosity. The ratchet assembly type test meets relevant industry standards, with fatigue tests exceeding 20,000 cycles and a breaking load exceeding 94.5kN.

[0036] In some examples, such as Figure 10 As shown, the rotary drive mechanism 4 includes a linear reciprocating drive mechanism 401, a rack 402 connected to the output end of the linear reciprocating drive mechanism 401, an outer ring 403 meshing with the rack 402, and an inner ring 404 lining the outer ring 403. The outer ring 403 and the inner ring 404 are coaxially sleeved. The outer ring 403 is fixed to the base 2, and the inner ring 404 is fixed to the base plate 406. An outer cover 405 is fixed on the base plate 406. The outer cover 405 is sleeved outside the outer ring 403 and has a notch for the rack 402 to extend into. The linear reciprocating drive mechanism 401 can be, but is not limited to, a cylinder, a telescopic rod, etc. The linear reciprocating drive mechanism 401 drives the rack 402 to move back and forth. The rack 402 meshes with the teeth on the outer ring 403 to drive the outer ring 403 to rotate. The outer ring 403 drives the base 2 and the pressure frame 3 to rotate synchronously.

[0037] In some examples, the fixed top rod 204 is fixed to the fixed column 210, the movable top rod 205 is fixed to the movable column 211, the movable column 211 is connected to the output end of the transverse drive mechanism 212, the transverse drive mechanism 212 can be, but is not limited to, a cylinder or elbow clamp, etc., a slide rail slider assembly is installed at the bottom of the movable column 211, and one end of the pressure frame 3 is a hinged end 303 that is hinged to the fixed column 210, and the other end is a free end 304; Two symmetrically arranged clamping plates 213 are installed on the movable column 211. The two clamping plates 213 and the blocking part 214 protruding from the top of the movable column 211 form a locking cavity for the free end 304 to be inserted and locked.

[0038] Working principle: (1) When clamping, first place the U-shaped hanging plate 105 into the V-groove of the first bracket 201 and make it abut against the limiting plate 202. The limiting plate 202 can restrict the degree of freedom of the U-shaped hanging plate 105 to move backward. (2) Then, the connecting frame horizontal tube 106 is passed through the U-shaped hanging plate 105, and the movable top columns 207 at both ends of it clamp and fix the connecting frame horizontal tube 106 under the action of the longitudinal movement drive mechanism 209. (3) Then, the support plate 102 is fitted onto the outside of the steel pipe 101 to form an assembly, and the assembly is placed into the V-groove of the second bracket 203. The fixed top rods 204 and movable top rods 205 at both ends of the steel pipe 101 clamp and fix the steel pipe 101. At the same time, two symmetrically distributed limiting posts 206 clamp the support plate 102, and the limiting step 2061 abuts against the support plate 102 to restrict its freedom of backward movement. (4) Next, the upper stiffener 103 and the lower stiffener 104 are placed in, and the pressure frame 3 is rotated and pressed down. The upper stiffener 103 or the lower stiffener 104 is inserted into the clamping cavity of the pressure plate 301 assembly and fixed with the help of the set screw 302. At the same time, the free end 304 of the pressure frame 3 is inserted into the locking cavity on the movable column 211 and locked. At this time, the ratchet connecting frame 1 is clamped. (5) Finally, the welding robot 5 performs symmetrical mirror spot welding on key parts, and then performs symmetrical mirror repair welding on the whole. At the same time, the linear reciprocating drive mechanism 401 can drive the rack 402 to move back and forth. The rack 402 meshes with the teeth on the outer ring 403 to drive the outer ring 403 to rotate. The outer ring 403 drives the base 2 and the pressure frame 3 to rotate synchronously to move the unwelded parts to the working area and continue the welding operation, realizing integrated welding without dead angles.

[0039] The above description, based on the preferred embodiments of this utility model, provides inspiration. Those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification but must be determined according to the claims.

Claims

1. A contact wire ratchet connecting frame anti-deformation mirror rotation welding device, wherein the ratchet connecting frame (1) includes a steel pipe (101), a support plate (102) connected to the middle of the steel pipe (101), an upper stiffening plate (103) disposed between the upper end face of the support plate (102) and the steel pipe (101), a lower stiffening plate (104) disposed between the lower end face of the support plate (102) and the steel pipe (101), a U-shaped hanging plate (105) fixed to the end of the steel pipe (101), and a connecting frame horizontal tube (106) connected between the U-shaped hanging plate (105) and the upper stiffening plate (103), wherein the welding device is used to clamp and fix the ratchet connecting frame (1) and then perform welding, characterized in that: The welding device includes a base (2), a pressure frame (3) hinged to the base (2), and a rotary drive mechanism (4) for driving the base (2) to rotate. A clamping space for clamping the ratchet connecting frame (1) is formed between the base (2) and the pressure frame (3). The base (2) includes a first limiting structure for supporting and limiting the U-shaped hanging plate (105), a second limiting structure for supporting and limiting the steel pipe (101), a third limiting structure for limiting the support plate (102), and a fourth limiting structure for limiting the connecting frame horizontal tube (106). The pressure frame (3) is equipped with a pressure plate assembly for pressing down the upper stiffening plate (103) and the lower stiffening plate (104). When the pressure frame (3) rotates and presses down to fix the upper stiffening plate (103) and the lower stiffening plate (104), the pressure frame (3) is locked by the second limiting structure.

2. The anti-deformation mirror rotation welding device for the contact wire ratchet connecting frame according to claim 1, characterized in that: The first limiting structure includes a first bracket (201) with a V-shaped groove and a limiting plate (202) protruding from one end of the first bracket (201) to laterally limit the U-shaped hanging plate (105).

3. The anti-deformation mirror rotation welding device for the contact wire ratchet connecting frame according to claim 1, characterized in that: The second limiting structure includes several second brackets (203) with V-shaped grooves, fixed top rods (204) and movable top rods (205) arranged at both ends of the second brackets (203) in the lateral direction. The fixed top rods (204) and movable top rods (205) are inserted into the steel pipe (101) to clamp the steel pipe (101).

4. The anti-deformation mirror rotation welding device for the contact wire ratchet connecting frame according to claim 1, characterized in that: The third limiting structure includes limiting posts (206) distributed on both sides of the longitudinal direction of the support plate (102) to clamp and limit its longitudinal direction, and the limiting posts (206) are formed with limiting steps (2061) for abutting against the support plate (102) to limit its lateral direction.

5. The anti-deformation mirror rotation welding device for the contact wire ratchet connecting frame according to claim 1, characterized in that: The fourth limiting structure includes movable top columns (207) distributed at both ends of the longitudinal direction of the connecting frame horizontal tube (106), movable seats (208) for mounting the movable top columns (207), and a longitudinal movement drive mechanism (209) for driving the movable seats (208) to reciprocate longitudinally to limit the longitudinal direction of the connecting frame horizontal tube (106).

6. The anti-deformation mirror rotation welding device for the contact wire ratchet connecting frame according to claim 1, characterized in that: The pressure plate assembly includes multiple pairs of pressure plates (301), and a clamping cavity for clamping the upper stiffener (103) or the lower stiffener (104) is formed between the two pressure plates (301) in each pair.

7. The anti-deformation mirror rotation welding device for the contact wire ratchet connecting frame according to claim 6, characterized in that: The pressure plate assembly also includes a set screw (302) that passes through the pressure plate (301) and is used to abut against the upper stiffener (103) or the lower stiffener (104).

8. The anti-deformation mirror rotation welding device for the contact wire ratchet connecting frame according to claim 1, characterized in that: It also includes two welding robots (5), which are located on both sides of the base (2) longitudinally.

9. The anti-deformation mirror rotation welding device for the contact wire ratchet connecting frame according to claim 1, characterized in that: The rotary drive mechanism (4) includes a linear reciprocating drive mechanism (401), a rack (402) connected to the output end of the linear reciprocating drive mechanism (401), an outer ring (403) meshing with the rack (402), and an inner ring (404) lining the outer ring (403). The outer ring (403) is fixed to the base (2).

10. The anti-deformation mirror rotation welding device for the contact wire ratchet connecting frame according to claim 3, characterized in that: The fixed top rod (204) is fixed on the fixed column (210), the movable top rod (205) is fixed on the movable column (211), the movable column (211) is connected to the output end of the transverse drive mechanism (212), one end of the pressure frame (3) is a hinge end (303) that is hinged to the fixed column (210), and the other end is a free end (304). The movable column (211) has two clamps (213) installed on both sides along its longitudinal direction. The two clamps (213) and the blocking part (214) protruding from the top of the movable column (211) form a locking cavity for the free end (304) to be inserted and locked.

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