Guardrail plate welding equipment

Abstract

The utility model relates to the technical field of welding equipment, in particular to guardrail plate welding equipment which is suitable for guardrail plates of various sizes and models through a wheel frame and a pressing wheel which can rotate flexibly, and is good in universality. Comprising a rack and a push cylinder, the welding device comprises a rack, two push cylinders and further comprises a mounting frame, a plurality of first telescopic rods, a plurality of first springs, a plurality of rigid wheel carriers, a plurality of pressing wheels, a welding mechanism and a feeding mechanism, the fixed ends of the two push cylinders are mounted on the rack, the lower ends of piston rods of the two push cylinders are connected with the mounting frame, the mounting frame is located above the middle of the feeding mechanism, and the welding mechanism is mounted on the lower portion of the mounting frame. The upper ends of the multiple first telescopic rods are connected with the mounting frame, the multiple first telescopic rods are sleeved with first springs, the rigid wheel carriers are in an A shape, the lower ends of the multiple first telescopic rods are rotationally connected with the middles of the multiple rigid wheel carriers correspondingly, and the multiple pressing wheels are rotationally mounted on the left sides and the right sides of the lower portions of the multiple rigid wheel carriers correspondingly; and the axial direction of the plurality of pressing wheels is parallel to the conveying direction of the guardrail plate.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of welding equipment, in particular to a guardrail plate welding equipment. BACKGROUND

[0002] The cross section of guardrail plate, especially the cross section of highway guardrail plate, is generally composed of multiple arc-shaped parts, and the guardrail plate is generally welded to a certain length during production. Various guardrail plate welding equipment is disclosed in the prior art, for example, a highway guardrail welding device disclosed in Chinese utility model patent CN218983776U. The welding device achieves good fixing effect by setting a support plate, a clamping device, a motor and a first screw. The motor on one side is started, and the motor drives the first gear to rotate through the second gear. The first gear drives the first screw to rotate, and the first screw drives the second screw to rotate through the transmission belt. The rotation of the second screw drives the first carriage to move down. The downward movement of the first carriage and the second carriage drives the clamping device to move down. The clamping device presses the top of the second guardrail plate. The clamping device exerts force on the top of the second guardrail plate to firmly press the second guardrail plate on the top of the support plate, thereby achieving good fixing effect.

[0003] However, the clamping device used by the above welding device to compress the guardrail plate is a fixed structure, so it can only support and clamp the arc-shaped part of one type and size of guardrail plate. When the curvature and position of the arc-shaped part of the guardrail plate change, it cannot be clamped and fixed well, resulting in poor versatility. UTILITY MODEL CONTENT

[0004] To solve the above technical problems, the utility model provides a guardrail plate welding equipment with a wheel frame and a compression wheel that can rotate flexibly, which is suitable for guardrail plates of various sizes and types and has good versatility.

[0005] The utility model discloses a guardrail plate welding equipment, including frame and push jar, still including mounting bracket, a plurality of telescopic link one, a plurality of spring one, a plurality of rigid wheel frame, a plurality of pressure wheel, welding mechanism and feeding mechanism, the frame is located in the middle part of feeding mechanism's left and right sides, the fixed end of two push jars is installed on the frame, and the piston rod lower extreme of two push jars is connected with mounting bracket, and the mounting bracket is located in the middle part of feeding mechanism's top, and the welding mechanism is installed in the lower part of mounting bracket, and the upper end of a plurality of telescopic link one is connected with mounting bracket, and a plurality of telescopic link one all suit spring one, and a plurality of spring one respectively elastic support a plurality of telescopic link one, and rigid wheel frame is A-shaped, and the lower extreme of a plurality of telescopic link one is respectively connected with the middle part of a plurality of rigid wheel frame, and a plurality of pressure wheel are respectively rotatably installed in the left and right sides of the lower part of a plurality of rigid wheel frame, and the axial direction of a plurality of pressure wheel is parallel with guardrail plate conveying direction, when working, the feeding mechanism conveys the butt joint of two guardrail plates to the below of welding mechanism, and the piston rod of two push jars is pushed down and makes the mounting bracket drop, so that the welding mechanism is close to and aligns the butt joint of two guardrail plates, simultaneously, a plurality of pressure wheel is pressed in the top of the end of two guardrail plates, because a plurality of rigid wheel frame is rotatably connected with the lower extreme of a plurality of telescopic link one, so that rigid wheel frame is adaptively rotated under the support of its two pressure wheel, and a plurality of telescopic link one is adaptively contracted with the arc degree of guardrail plate, and the elastic support of a plurality of spring one to a plurality of telescopic link one makes the pressure of a plurality of pressure wheel to guardrail plate continue stable, after two guardrail plates are clamped and fixed, welding machine mechanism is welded to the weld, compared with prior art, when the arc degree and position of the arc part of guardrail plate change, can also be well clamped and fixed, can adapt to a plurality of sizes and models of guardrail plate, and the versatility is good.

[0006] Preferably, the welding mechanism includes a horizontal slot beam, a lead screw, a servo motor, a sliding block, a telescopic rod two, a spring two, a roller, a welding gun seat and a welding gun, the horizontal slot beam is installed at the lower end face of the mounting bracket, the lead screw is rotatably installed in the horizontal slot beam, the servo motor is installed on the horizontal slot beam, the output shaft of the servo motor is in transmission connection with the lead screw, the sliding block is slidably installed in the horizontal slot beam, the sliding block is in transmission connection with the lead screw through a lead screw nut, the upper end of the telescopic rod two is connected with the sliding block, the spring two is sleeved on the telescopic rod two, the spring two elastically supports the telescopic rod two, the roller is rotatably installed at the lower end of the telescopic rod two through a shaft, the shaft is fixedly connected with the telescopic rod two, the axis of the roller is parallel with the conveying direction of the guardrail plate, the welding gun seat is installed at the end of the shaft of the roller, and the welding gun is installed on the welding gun seat; after two guardrail plates are clamped and fixed, the roller is rolled and pressed on the guardrail plate by the telescopic rod two and the spring two, the servo motor drives the lead screw to rotate, the lead screw drives the sliding block to move along the horizontal slot beam through the lead screw nut, the sliding block drives the roller to roll on the upper surface of the guardrail plate through the telescopic rod two and the spring two, the roller drives the welding gun to move through the welding gun seat, and the welding gun welds the weld of two guardrail plates, in the rolling process of the roller, the telescopic rod two and the spring two are adaptively telescopic, automatic welding is realized, and the working efficiency is high.

[0007] Preferably, the two guide wheels are rotatably installed at the ends of the shaft of the roller, the welding gun seat is rotatably installed at the ends of the two elastic wheel frames, the axes of the two guide wheels are parallel to the conveying direction of the guardrail plate, and the two guide wheels support the welding gun seat and the welding gun through the elastic wheel frames, so that the welding gun is always perpendicular to the weld during welding, thereby improving the welding quality.

[0008] Preferably, the two guide wheels are rotatably installed at the ends of the shaft of the roller, the welding gun seat is rotatably installed at the ends of the two elastic wheel frames, the axes of the two guide wheels are parallel to the conveying direction of the guardrail plate, and the two guide wheels support the welding gun seat and the welding gun through the elastic wheel frames, so that the welding gun is always perpendicular to the weld during welding, thereby improving the welding quality.

[0009] Preferably, the feeding mechanism comprises a sub-frame, a plurality of drive shafts, a motor, a plurality of middle rollers, a plurality of side rollers, a plurality of transmission assemblies and a plurality of limiting discs, the plurality of drive shafts are rotatably installed on the sub-frame, the motor is installed on the sub-frame, the motor is in transmission connection with one drive shaft, the plurality of drive shafts are in transmission connection through the plurality of transmission assemblies, the middle portions of the plurality of drive shafts are provided with the middle rollers, the middle portions of the wheel surfaces of the plurality of middle rollers are provided with V-shaped grooves, the left and right ends of the plurality of drive shafts are provided with the side rollers, and the outer sides of the plurality of side rollers are provided with the limiting discs; the transmission assembly can be a chain transmission assembly or a synchronous belt transmission assembly, in work, the middle V-shaped grooves of the plurality of middle rollers support the middle arc-shaped portions of the guardrail plates, the plurality of side rollers support the two side portions of the guardrail plates, and the plurality of limiting discs limit the edges of the guardrail plates, the motor drives one drive shaft to rotate, the drive shaft drives the other plurality of drive shafts to synchronously rotate through the plurality of transmission assemblies, and the plurality of drive shafts drive the plurality of middle rollers and the plurality of side rollers to rotate and convey the guardrail plates, thereby being good in practicability.

[0010] Preferably, the two guide wheels are rotatably installed at the ends of the shaft of the roller, the welding gun seat is rotatably installed at the ends of the two elastic wheel frames, the axes of the two guide wheels are parallel to the conveying direction of the guardrail plate, and the two guide wheels support the welding gun seat and the welding gun through the elastic wheel frames, so that the welding gun is always perpendicular to the weld during welding, thereby improving the welding quality.

[0011] Compared with the prior art, the guardrail plate can be well clamped and fixed when the arc degree and position of the arc-shaped part of the guardrail plate change, and the guardrail plate of various sizes and models can be adapted, and the universality is good. BRIEF DESCRIPTION OF DRAWINGS

[0012] Fig. 1 is a structural schematic diagram of the utility model;

[0013] Fig. 2 is a side view structural schematic diagram of the utility model;

[0014] Fig. 3 is a structural schematic diagram of the working state of the utility model;

[0015] Fig. 4 is a structural schematic diagram of the structure of the push cylinder, mounting frame, telescopic rod one, spring one, rigid wheel frame, pressure wheel and welding mechanism;

[0016] Fig. 5 is a structural schematic diagram of the structure of the welding mechanism in the disassembled state;

[0017] Fig. 6 is a structural schematic diagram of the structure of the telescopic rod two, roller, guide wheel, annular grating and grating.

[0018] Markings in the drawings: 1, rack; 2, push cylinder; 3, mounting frame; 4, telescopic rod one; 5, spring one; 6, rigid wheel frame; 7, pressure wheel; 8, transverse groove beam; 9, screw rod; 10, servo motor; 11, sliding block; 12, telescopic rod two; 13, spring two; 14, roller; 15, welding gun seat; 16, welding gun; 17, guide wheel; 18, annular grating; 19, grating; 20, auxiliary rack; 21, driving shaft; 22, motor; 23, middle supporting wheel; 24, side supporting wheel; 25, transmission assembly; 26, limit disc; 27, laser head. DETAILED DESCRIPTION

[0019] In order to facilitate the understanding of the utility model, the utility model will be described more fully below with reference to the relevant drawings. The utility model can be realized in many different forms, and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the utility model more thorough and comprehensive.

[0020] Embodiment 1

[0021] As Figs. 1-6As shown, a guardrail plate welding equipment, including frame 1 and push cylinder 2, and including mounting bracket 3, a plurality of telescopic rod 4, a plurality of spring 5, a plurality of rigid wheel frame 6, a plurality of pressure wheel 7, welding mechanism and feeding mechanism, frame 1 is located in the middle of the feeding mechanism on both sides, the fixed end of the two push cylinder 2 is installed on the frame 1, the lower end of the piston rod of the two push cylinder 2 is connected with the mounting bracket 3, the mounting bracket 3 is located above the middle of the feeding mechanism, the welding mechanism is installed at the lower part of the mounting bracket 3, the upper end of the plurality of telescopic rod 4 is connected with the mounting bracket 3, the plurality of telescopic rod 4 is sleeved with spring 5, the plurality of spring 5 respectively elastically supports the plurality of telescopic rod 4, the rigid wheel frame 6 is A-shaped, the lower end of the plurality of telescopic rod 4 is respectively rotatably connected with the middle part of the plurality of rigid wheel frame 6, the plurality of pressure wheel 7 is rotatably installed on the left and right sides of the lower part of the plurality of rigid wheel frame 6, the axial direction of the plurality of pressure wheel 7 is parallel to the conveying direction of the guardrail plate; the welding mechanism includes cross groove beam 8, screw rod 9, servo motor 10, sliding block 11, telescopic rod 12, spring 13, roller 14, welding gun seat 15 and welding gun 16, cross groove beam 8 is installed at the lower end surface of the mounting bracket 3, screw rod 9 is rotatably installed in the cross groove beam 8, servo motor 10 is installed on the cross groove beam 8, the output shaft of the servo motor 10 is drivingly connected with the screw rod 9, the sliding block 11 is slidingly installed in the cross groove beam 8, the sliding block 11 is drivingly connected with the screw rod 9 through the screw nut, the upper end of the telescopic rod 12 is connected with the sliding block 11, the spring 13 is sleeved on the telescopic rod 12, the spring 13 elastically supports the telescopic rod 12, the roller 14 is rotatably installed at the lower end of the telescopic rod 12 through the shaft, the shaft is fixedly connected with the telescopic rod 12, the axis of the roller 14 is parallel to the conveying direction of the guardrail plate, the welding gun seat 15 is installed at the end of the shaft of the roller 14, the welding gun 16 is installed on the welding gun seat 15; further comprising two guide wheels 17, the welding gun seat 15 is rotatably installed on the end of the shaft of the roller 14, the left and right ends of the welding gun seat 15 are both installed with elastic wheel frame, the two guide wheels 17 are rotatably installed at the ends of the elastic wheel frame, the axial direction of the two guide wheels 17 is parallel to the conveying direction of the guardrail plate; further comprising annular grating 18 and grating 19, the end of the guide wheel 17 is concentrically provided with the annular grating 18, the grating 19 is installed on the elastic wheel frame of the guide wheel 17, the grating 19 cooperates with the annular grating 18 to detect the rotation condition of the guide wheel 17, the grating 19 is electrically connected with the controller of the servo motor 10.

[0022] When working, the feeding mechanism transports the joint of the two guardrails to the lower side of the welding mechanism, the piston rods of the two push cylinders 2 are extended downward to push the mounting frame 3 to descend, so that the welding mechanism is close to and aligned with the joint of the two guardrails, and the plurality of pressing wheels 7 are pressed on the upper side of the end of the two guardrails. Since the plurality of rigid wheel frames 6 are rotationally connected with the lower ends of the plurality of telescopic rods 4, the rigid wheel frames 6 are adaptively rotated under the support of the two pressing wheels 7, and the plurality of telescopic rods 4 are adaptively contracted according to the arc degree of the guardrails. The elastic support of the plurality of springs 5 to the plurality of telescopic rods 4 makes the pressure of the plurality of pressing wheels 7 to the guardrails continue to be stable. After the two guardrails are clamped and fixed, the rollers 14 are rolled and pressed on the guardrails by the telescopic rods 12 and the springs 13, the two guide wheels 17 are pressed on the guardrails by the two elastic wheel frames, the lead screw 9 is driven to rotate by the servo motor 10, the sliding block 11 is driven to move along the horizontal groove beam 8 by the lead screw nut, the rollers 14 are rolled on the upper surface of the guardrails by the telescopic rods 12 and the springs 13, the welding gun 16 is moved by the welding gun seat 15, the welding gun 16 welds the weld of the two guardrails, the telescopic rods 12 and the springs 13 are adaptively extended and contracted during the rolling of the rollers 14, the welding gun seat 15 and the welding gun 16 are supported by the two guide wheels 17 through the elastic wheel frames, so that the welding gun 16 is always perpendicular to the weld during the welding process, the welding gun 16 automatically welds the weld, the guide wheel 17 drives the annular grating 18 to rotate, the grating 19 measures and detects the rotational speed, linear speed or angular speed of the annular grating 18 and the guide wheel 17 by emitting a signal to the annular grating 18 and receiving the reflected signal of the annular grating 18, and generates a corresponding electric signal, when the guide wheel 17 accelerates, the servo motor 10 slows down according to the electric signal, when the guide wheel 17 decelerates, the servo motor 10 speeds up according to the electric signal, so that the moving speed of the guide wheel 17 relative to the upper surface of the arc plate remains stable, so that the moving speed of the welding gun 16 relative to the weld remains stable, the welding quality is improved, compared with the prior art, when the arc degree and position of the arc part of the guardrail change, the clamping and fixing can also be well performed, a variety of sizes and models of guardrails can be adapted, and the versatility is good.

[0023] Example 2

[0024] As Figs. 1-3As shown, on the basis of embodiment 1, the feeding mechanism comprises a sub-frame 20, a plurality of driving shafts 21, a motor 22, a plurality of middle supporting wheels 23, a plurality of side supporting wheels 24, a plurality of transmission assemblies 25 and a plurality of limiting discs 26, the plurality of driving shafts 21 are rotatably installed on the sub-frame 20, the motor 22 is installed on the sub-frame 20, the motor 22 is in transmission connection with one driving shaft 21, the plurality of driving shafts 21 are in transmission connection through the plurality of transmission assemblies 25, the middle part of each of the plurality of driving shafts 21 is provided with a middle supporting wheel 23, the middle part of the wheel surface of each of the plurality of middle supporting wheels 23 is provided with a V-shaped groove, the left and right ends of each of the plurality of driving shafts 21 are provided with a side supporting wheel 24, and the outer side of each of the plurality of side supporting wheels 24 is provided with a limiting disc 26; further comprising two laser heads 27, the two laser heads 27 are installed on the frame 1, and the laser lines emitted by the two laser heads 27 are respectively used for positioning the butt-joint ends of the two guard plates.

[0025] The transmission assembly 25 can be a chain transmission assembly, a synchronous belt transmission assembly, etc., in working, the middle V-shaped groove of each of the plurality of middle supporting wheels 23 supports the middle arc-shaped part of the guard plate, each of the plurality of side supporting wheels 24 supports the two side parts of the guard plate, each of the plurality of limiting discs 26 limits the edge of the guard plate, the motor 22 drives one driving shaft 21 to rotate, the driving shaft 21 drives the other plurality of driving shafts 21 to rotate synchronously through the plurality of transmission assemblies 25, the plurality of driving shafts 21 drive the plurality of middle supporting wheels 23 and the plurality of side supporting wheels 24 to rotate to convey the guard plate, the two laser heads 27 emit laser to irradiate on the guard plate and form two marking lines, when the end edges of the two guard plates respectively coincide with the two marking lines, the motor 22 stops, thereby the welding seam is positioned, and the welding quality is improved.

[0026] As Figs. 1-6As shown, the guardrail plate welding equipment, in working, first supports the middle arc-shaped part of the guardrail plate through the middle V-shaped groove of the middle supporting wheel 23, supports the two side parts of the guardrail plate through the multiple edge supporting wheels 24, and limits the edge of the guardrail plate through the multiple limiting discs 26, then the motor 22 drives one driving shaft 21 to rotate, the driving shaft 21 drives other multiple driving shafts 21 to rotate synchronously through multiple transmission assemblies 25, the multiple driving shafts 21 drive the multiple middle supporting wheels 23 and the multiple edge supporting wheels 24 to rotate and convey the guardrail plate, when the end edges of the two guardrail plates coincide with the two marking lines respectively, the motor 22 stops, then the piston rods of the two push cylinders 2 are extended downward to push the mounting frame 3 to descend, so that the welding mechanism is close to and aligned with the butt joint of the two guardrail plates, meanwhile, the multiple pressure rollers 7 are pressed on the end parts of the two guardrail plates, due to the rotation connection between the multiple rigid wheel frames 6 and the lower ends of the multiple telescopic rods one 4, the rigid wheel frame 6 is adaptively rotated under the support of the two pressure rollers 7, and the multiple telescopic rods one 4 are adaptively contracted according to the arc degree of the guardrail plate, the elastic support of the multiple springs one 5 to the multiple telescopic rods one 4 makes the pressure of the multiple pressure rollers 7 on the guardrail plate continue to be stable, finally the servo motor 10 drives the lead screw 9 to rotate, the lead screw 9 drives the sliding block 11 to move along the horizontal groove beam 8 through the lead screw nut, the sliding block 11 drives the roller 14 to roll on the upper surface of the guardrail plate through the telescopic rod two 12 and the spring two 13, the roller 14 drives the welding gun 16 to move through the welding gun seat 15, and the welding gun 16 can weld the welds of the two guardrail plates.

[0027] The main function realized by the utility model is:

[0028] 1. The wheel frame and the pressure roller can rotate flexibly, and are suitable for guardrail plates of various sizes and models, and have good versatility.

[0029] 2. The welds of two guardrail plates can be automatically welded, and the working efficiency is high.

[0030] 3. The angle of the rigid wheel frame 6 is adjusted in real time, and the welding quality is improved by keeping a stable speed.

[0031] The installation mode, connection mode or setting mode of the guardrail plate welding equipment are all common mechanical modes, and as long as the beneficial effects can be achieved, they can be implemented. The rack 1, the push cylinder 2, the telescopic rod one 4, the spring one 5, the pressure roller 7, the horizontal groove beam 8, the lead screw 9, the servo motor 10, the sliding block 11, the telescopic rod two 12, the spring two 13, the roller 14, the welding gun 16, the guide wheel 17, the annular grating 18, the grating 19, the auxiliary rack 20, the driving shaft 21, the motor 22, the middle supporting wheel 23, the edge supporting wheel 24 and the transmission assembly 25 are purchased on the market, and the technical personnel in the industry only need to install and operate according to the attached instruction manual, without the need for the technical personnel in the field to put in creative labor.

[0032] All technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs unless specifically defined otherwise. The terminology used in the description herein is for describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0033] The preferred embodiments of the present application have been described above with the aid of drawing only for a purpose of illustration. It will be apparent to those skilled in the art that numerous modifications and variations within the scope of the present application are possible in light of this disclosure and it is not intended to limit the application to the specific embodiments described.

Claims

1. A guardrail panel welding apparatus comprising a frame (1) and a push cylinder (2); characterized in that, The utility model also includes a mounting frame (3), a plurality of telescopic rods (4), a plurality of springs (5), a plurality of rigid wheel frames (6), a plurality of pressure rollers (7), a welding mechanism and a feeding mechanism, the rack (1) is located at the middle part of the feeding mechanism, the fixed end of the two push cylinders (2) is installed on the rack (1), the lower end of the piston rod of the two push cylinders (2) is connected with the mounting frame (3), the mounting frame (3) is located above the middle part of the feeding mechanism, the welding mechanism is installed on the lower part of the mounting frame (3), the upper end of the plurality of telescopic rods (4) is connected with the mounting frame (3), the plurality of telescopic rods (4) are all sleeved with the spring (5), the plurality of springs (5) respectively elastically support the plurality of telescopic rods (4), the rigid wheel frame (6) is A-shaped, the lower end of the plurality of telescopic rods (4) is respectively rotationally connected with the middle part of the plurality of rigid wheel frames (6), the plurality of pressure rollers (7) are respectively rotationally installed on the left and right sides of the lower part of the plurality of rigid wheel frames (6), and the axial direction of the plurality of pressure rollers (7) is parallel to the conveying direction of the guardrail plate.

2. A guardrail panel welding apparatus as defined in claim 1, wherein, The welding mechanism includes a cross groove beam (8), a lead screw (9), a servo motor (10), a sliding block (11), a telescopic rod (12), a spring (13), a roller (14), a welding gun seat (15) and a welding gun (16), the cross groove beam (8) is installed on the lower end face of the mounting frame (3), the lead screw (9) is rotationally installed in the cross groove beam (8), the servo motor (10) is installed on the cross groove beam (8), the output shaft of the servo motor (10) is in transmission connection with the lead screw (9), the sliding block (11) is slidingly installed in the cross groove beam (8), the sliding block (11) is in transmission connection with the lead screw (9) through a lead screw nut, the upper end of the telescopic rod (12) is connected with the sliding block (11), the spring (13) is sleeved on the telescopic rod (12), the spring (13) elastically supports the telescopic rod (12), the roller (14) is rotationally installed on the lower end of the telescopic rod (12) through a shaft, the shaft is fixedly connected with the telescopic rod (12), the axis of the roller (14) is parallel to the conveying direction of the guardrail plate, the welding gun seat (15) is installed on the shaft end of the roller (14), and the welding gun (16) is installed on the welding gun seat (15).

3. A guardrail panel welding apparatus as defined in claim 2 wherein, The utility model also includes two guide wheels (17), the welding gun seat (15) is rotationally installed on the shaft end of the roller (14), the left and right ends of the welding gun seat (15) are all installed with elastic wheel frames, the two guide wheels (17) are respectively rotationally installed on the end parts of the elastic wheel frames, and the axial direction of the two guide wheels (17) is parallel to the conveying direction of the guardrail plate.

4. A guardrail panel welding apparatus as defined in claim 3 wherein, The utility model also includes an annular grating (18) and a grating (19), the end part of the guide wheel (17) is concentrically provided with the annular grating (18), the grating (19) is installed on the elastic wheel frame of the guide wheel (17), the grating (19) cooperates with the annular grating (18) and detects the rotation condition of the guide wheel (17), and the grating (19) is electrically connected with the controller of the servo motor (10).

5. A guardrail panel welding apparatus as defined in claim 1 wherein, The feeding mechanism comprises a sub-frame (20), a plurality of driving shafts (21), a motor (22), a plurality of middle supporting wheels (23), a plurality of side supporting wheels (24), a plurality of transmission assemblies (25) and a plurality of limiting discs (26), the plurality of driving shafts (21) are rotatably installed on the sub-frame (20), the motor (22) is installed on the sub-frame (20), the motor (22) is in transmission connection with one driving shaft (21), the plurality of driving shafts (21) are in transmission connection through the plurality of transmission assemblies (25), the middle part of each driving shaft (21) is provided with a middle supporting wheel (23), the wheel surface middle part of each middle supporting wheel (23) is provided with a V-shaped groove, the left and right ends of each driving shaft (21) are provided with a side supporting wheel (24), and the outer side of each side supporting wheel (24) is provided with a limiting disc (26).

6. A guardrail panel welding apparatus as defined in claim 5, wherein, Two laser heads (27) are further included, the two laser heads (27) are installed on the frame (1), and the laser lines emitted by the two laser heads (27) are respectively used for positioning the butt-joint ends of the two guardrail plates.

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