Positioning tool for automatic welding of guardrail plate

Abstract

The invention provides a positioning tool for automatic welding of a guardrail plate, and belongs to the technical field of guardrail plate machining. Comprising a welding table, a moving frame is slidably arranged at the top of the welding table, a welding machine is arranged at the output end of the moving frame, a positioning mechanism used for supporting a guardrail plate is arranged at the top of the welding table, the positioning mechanism comprises a supporting table, and the supporting table is detachably installed at the top of the welding table. The top of the top supporting block is adopted to be matched with the contour of the wave trough, so that the supporting contact area is effectively increased; moreover, the non-linear rigidity characteristic of the disc spring set is utilized, the jacking block is gradually converted into a rigid supporting state under the action of welding pressure, the sinking trend of the wave trough of the wave-shaped guardrail plate is effectively counteracted, and therefore the whole-course stable supporting of the wave trough area is achieved, it is guaranteed that the distance between a welding gun and the plate is constant, and it is guaranteed that welding heat fully penetrates through the plate; the welding process stability is improved.

Description

Technical Field

[0001] This invention relates to the field of guardrail processing technology, and in particular to a positioning fixture for automated welding of guardrails. Background Technology

[0002] As a core component of highway traffic safety facilities, guardrail panels typically employ a corrugated plate structure, with a cross-section exhibiting continuous alternating peaks and troughs to enhance structural strength and energy absorption capacity. During the manufacturing process of guardrail panels, welding is widely used for lap joints between panels and for reinforcing connections between panels and back panels. Currently, existing technologies for welding corrugated guardrail panels commonly employ positioning fixtures including flat support seats, V-blocks, or simple pressure plate structures. During operation, the corrugated plate is placed on the support surface, and a cylinder or manual clamp is used to apply pressure from above to clamp and position the workpiece.

[0003] In summary, when the welding torch travels to the trough of the corrugated guardrail, the welding pressure is directly applied to the weakest part of the structure because the area is suspended and unsupported. This can easily cause the guardrail to sag elastically. The sag of the workpiece will instantly increase the distance between the welding torch and the plate, which will prevent the heat of the electric welding from effectively penetrating the plate. Therefore, the stability of the corrugated guardrail welding process will be reduced.

[0004] Therefore, this application provides a positioning fixture for automated welding of guardrail panels to meet the requirements. Summary of the Invention

[0005] The purpose of this invention is to provide a positioning fixture for automated welding of guardrail panels in order to solve the above-mentioned problems. When positioning the guardrail panel, the guardrail panel is first placed on a pad. The first sliding frame is moved towards the welding side by a motor-driven transmission shaft. Then, the sliding plates on both sides are pulled inward synchronously by a pull rod, causing the flip plate to contact the side of the guardrail panel through the buffer pad. Under the action of the first spring, it adaptively clamps the corrugated plates of different specifications to complete the centering positioning. Subsequently, the third sliding frame is moved horizontally and locked according to the trough position. The second threaded rod is rotated to make the adjusting frame drive the pressure head to press down, and the third spring provides a continuous elastic clamping force. Simultaneously, by rotating the nut according to the trough depth, the first threaded rod drives the second sliding frame to move horizontally. The wedge block and disc spring assembly are lifted by the inclined plane, so that the contoured surface of the top support block flexibly contacts the bottom of the trough and becomes a rigid support under welding pressure. During the welding operation, the welding machine moves horizontally and rises and falls with the moving frame to perform welding. In this process, the pressing mechanism absorbs vibration through spring deformation, and the support mechanism provides stable bottom support, thereby ensuring the welding quality of the guardrail and solving the problems mentioned in the background technology.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: A positioning fixture for automated welding of guardrail panels includes a welding table, a movable frame slidably mounted on the top of the welding table, a welding machine mounted on the output end of the movable frame, and a positioning mechanism for supporting the guardrail panels mounted on the top of the welding table.

[0007] The positioning mechanism includes a support platform, which is detachably mounted on the top of the welding table. A groove is formed on one outer surface of the support platform. A motor is fixedly connected to the outer surface of the support platform away from the groove. A drive shaft is fixedly connected to the output end of the motor. A first fixed shaft is fixedly connected to the inner wall of the support platform. A pad is fixedly connected to the top of the support platform, and the upper surface of the pad contacts the bottom of the guardrail panel to provide planar support for the guardrail panel. An adjustment component for centering the guardrail panel is provided at the output end of the motor. A first sliding groove and a second sliding groove are formed on the top outer surface of the support platform. A support mechanism for supporting the troughs of the guardrail panel is provided at the end of the support platform near the welding machine. A pressing mechanism for applying downward pressure to the top of the troughs of the guardrail panel is provided at the end of the support platform near the support mechanism.

[0008] Optionally, the adjustment assembly includes a first sliding frame, which is movably sleeved on the outer surface of the drive shaft. The inner wall of the first sliding frame away from the drive shaft is movably sleeved on the outer surface of the first fixed shaft. A slide plate is provided on the top of the first sliding frame. The slide plate is slidably connected to the inner wall of the first sliding groove. A pull rod is rotatably connected to the inner wall of the first sliding frame through a rotating shaft. The end of the pull rod away from the first sliding frame is rotatably connected to the slide plate.

[0009] Optionally, a support plate is fixedly connected to one end of the slide plate near the guardrail. The support plate is slidably connected to the inner wall of the second sliding groove. A flip plate is rotatably connected to the inner wall of the slide plate near the support plate via a pivot. During the centering and positioning process for guardrails of different specifications, the flip plate can swing around the pivot, thereby adapting to the sides of irregular guardrails and ensuring stable lateral constraint for corrugated plates of different shapes. A buffer pad is fixedly connected to the outer surface of the flip plate near the guardrail. The buffer pad contacts the outer surface of the guardrail and avoids rigid collision damage to the surface coating of the guardrail.

[0010] Optionally, the outer wall of the flip plate is also fixedly connected to a connecting shaft, the connecting shaft is slidably connected to the inner wall of the slide plate, and a first spring is movably sleeved on the outer surface of the connecting shaft. The first spring is fixedly connected between the flip plate and the slide plate, and the first spring is used to apply the extrusion force of the flip plate on the side of the guardrail.

[0011] Optionally, the support mechanism includes a fixed block, with a top support block movably inserted into the top of the fixed block. The outer surface of the top support block is adapted to the bottom of the guardrail panel to increase the contact area with the bottom of the trough. The top support block can be replaced according to different specifications of guardrail panels to support the bottom of the trough peaks of the guardrail panel. A disc spring assembly is fixedly connected to the bottom of the fixed block, and a wedge block is fixedly connected to the bottom of the disc spring assembly.

[0012] Optionally, a second sliding frame is provided on the outside of the wedge block. The second sliding frame has an inclined surface adapted to the inclined surface of the wedge block, which is used to lift the fixed block through the inclined surface. A second spring is fixedly connected to one side of the outer wall of the second sliding frame, and the end of the second spring away from the second sliding frame is fixedly connected to the inner wall of the support platform.

[0013] Optionally, a second fixed shaft is fixedly connected to the end of the second sliding frame away from the second spring, and the second fixed shaft is slidably connected to the inner wall of the support platform.

[0014] Optionally, a first threaded rod is rotatably connected to the middle position of the second sliding frame, and a nut is movably sleeved on the outer surface of the end of the first threaded rod away from the second sliding frame. The nut is used to adjust the sliding stroke of the second sliding frame and to limit the lowering height of the fixed block.

[0015] Optionally, the pressing mechanism includes a third sliding frame, the bottom of which is slidably connected to the inner wall of the groove. The third sliding frame can slide horizontally along the groove to adjust the overall position of the pressing mechanism according to the lateral position of the guardrail trough. At the same time, a bolt is fixedly connected to the outer surface of the third sliding frame near the groove. The bolt is used to press against the inner wall of the groove to increase the sliding friction at the bottom of the third sliding frame. A second threaded rod is rotatably connected to the top inner wall of the third sliding frame, and an adjusting frame is movably sleeved on the outer surface of the second threaded rod.

[0016] Optionally, a force-bearing frame is slidably connected to the inner wall of the adjusting frame, and a pressure head is fixedly connected to the bottom end of the force-bearing frame. A third spring is provided between the force-bearing frame and the pressure head, and the two ends of the third spring are fixedly connected to the force-bearing frame and the pressure head, respectively. The third spring is used to absorb the vibration generated by the guardrail during the welding operation.

[0017] Compared with the prior art, the present invention has at least the following beneficial effects: In the above solution, the positioning fixture for automated welding of guardrail provided in this application, by configuring a support mechanism, adopts a contoured fitting surface that matches the top of the top support block with the contour of the trough, effectively increasing the support contact area; and by utilizing the nonlinear stiffness characteristics of the disc spring assembly, the top support block gradually transforms into a rigid support state under the action of welding pressure, effectively counteracting the sinking trend at the trough of the corrugated guardrail, thereby achieving stable support throughout the trough area, ensuring a constant distance between the welding torch and the plate, ensuring that the welding heat fully penetrates the plate, and improving the stability of the welding process; At the same time, the downward pressing mechanism applies elastic clamping force above the trough, and the third spring absorbs and dissipates vibration energy, blocking the transmission of vibration generated by the guardrail to the welding machine. In addition, combined with the rigid support of the support mechanism at the bottom of the trough, the vibration displacement of the workpiece during welding can be suppressed, thereby ensuring that the welding equipment can run along the preset trajectory. This can solve problems such as weld deviation and uneven penetration, and improve the yield of products. Attached Figure Description

[0018] The accompanying drawings, which are incorporated herein and form part of the specification, illustrate embodiments of the invention and, together with the specification, further serve to explain the principles of the invention and enable those skilled in the art to practice and use the invention.

[0019] Figure 1 This is a frontal view of the entire invention; Figure 2 This is a schematic diagram of the welding station of the present invention; Figure 3 This is a schematic diagram of the positioning mechanism of the present invention; Figure 4 This is a cross-sectional schematic diagram of the positioning mechanism of the present invention; Figure 5 This is a cross-sectional schematic diagram of the support platform of the present invention; Figure 6 This is a schematic diagram of the adjustment component of the present invention; Figure 7 This is a schematic diagram of the support mechanism of the present invention; Figure 8 This is an exploded view of the support mechanism of the present invention; Figure 9 For the present invention Figure 2 An enlarged diagram of A in the diagram.

[0020] Figure label: 1. Welding table; 2. Moving frame; 3. Welding machine; 4. Positioning mechanism; 41. Support platform; 42. Pad; 43. Groove; 44. First fixed shaft; 45. Motor; 46. Transmission shaft; 47. First sliding groove; 48. Second sliding groove; 49. Adjustment assembly; 491. First sliding frame; 492. Pull rod; 493. Slide plate; 494. Support plate; 495. Flip plate; 496. Buffer pad; 497. Connecting shaft; 498. First spring; 5. Support mechanism; 501. Fixed block; 502. Disc spring assembly; 503. Wedge block; 504. Top support block; 505. Second sliding frame; 506. Second fixed shaft; 507. First threaded rod; 508. Nut; 509. Second spring; 6. Pressing mechanism; 61. Third sliding frame; 62. Second threaded rod; 63. Adjusting frame; 64. Force-bearing frame; 65. Press head; 66. Third spring.

[0021] As shown in the figure, specific structures and devices are marked in the figure to clearly illustrate the structure of the embodiments of the present invention. However, this is only for illustrative purposes and is not intended to limit the present invention to this specific structure, device and environment. Those skilled in the art can adjust or modify these devices and environments according to specific needs. Detailed Implementation

[0022] The positioning fixture for automated welding of guardrail panels provided by the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It should also be noted that, in order to make the embodiments more detailed, the following embodiments are the best and preferred embodiments, and those skilled in the art can also use other alternative methods to implement some known technologies; moreover, the accompanying drawings are only for more specific description of the embodiments and are not intended to specifically limit the present invention.

[0023] It should be noted that the use of terms such as "an embodiment," "an embodiment," "an exemplary embodiment," and "some embodiments" in the specification indicates that the described embodiment may include a specific feature, structure, or characteristic, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments (whether explicitly described or not) should be within the knowledge of those skilled in the art.

[0024] Generally, terms can be understood at least partly from their use in context. For example, depending at least partly on the context, the term "one or more" as used herein can be used to describe any feature, structure, or characteristic in a singular sense, or a combination of features, structures, or characteristics in a plural sense. Additionally, the term "based on" can be understood not necessarily to convey an exclusive set of factors, but rather, alternatively, depending at least partly on the context, to allow for the presence of other factors that are not necessarily explicitly described.

[0025] It is understood that the meanings of “on”, “above”, and “above” in this invention should be interpreted in the broadest manner, such that “on” means not only “directly on” something, but also includes the meaning of being “on” something with an intervening feature or layer, and that “above” or “above” means not only “on” something, but also includes the meaning of being “on” something without an intervening feature or layer.

[0026] Furthermore, spatially related terms such as “below,” “under,” “lower,” “above,” and “upper” are used herein for convenience to describe the relationship of one element or feature to one or more other elements or features, as illustrated in the accompanying drawings. Spatially related terms are intended to cover different orientations in the use or operation of the device other than those depicted in the accompanying drawings. The device may be oriented in other ways, and the spatially related descriptive terms used herein can be interpreted similarly.

[0027] As the welding torch travels continuously along the waveform contour, the welding load on different peak and trough sections of the guardrail changes dynamically with the cross-sectional height. In addition, the high-frequency micro-amplitude vibration caused by the welding thermal cycle can easily cause the welding trajectory to deviate from the preset path, resulting in welding defects such as weld deviation, lack of fusion, and uneven penetration. This seriously affects the weld formation quality and appearance uniformity, and significantly reduces the welding stability and yield of the product.

[0028] like Figure 1 and Figure 2 As shown, an embodiment of the present invention provides a positioning fixture for automated welding of guardrail panels, including a welding table 1, a movable frame 2 slidably disposed on the top of the welding table 1, a welding machine 3 disposed at the output end of the movable frame 2, and a positioning mechanism 4 for supporting the guardrail panel disposed on the top of the welding table 1. The movable frame 2 slides horizontally on the top of the welding table 1 to move the welding machine 3 to the welding position of the guardrail panel. After the welding machine 3 moves up and down along the output end of the movable frame 2, it moves the welding machine 3 closer to or further away from the welding surface of the guardrail panel, thereby completing the welding operation of the corrugated guardrail panel.

[0029] In this embodiment, as Figures 3 to 5As shown, the positioning mechanism 4 includes a support platform 41, which is detachably mounted on the top of the welding table 1. A groove 43 is provided on one outer surface of the support platform 41. A motor 45 is fixedly connected to the outer surface of the support platform 41 away from the groove 43. A transmission shaft 46 is fixedly connected to the output end of the motor 45. A first fixed shaft 44 is fixedly connected to the inner wall of the support platform 41. A pad 42 is fixedly connected to the top of the support platform 41. The upper surface of the pad 42 contacts the bottom of the guardrail panel to provide planar support for the guardrail panel. An adjustment component 49 for centering the guardrail panel is provided at the output end of the motor 45. A first sliding groove 47 and a second sliding groove 48 are provided on the top outer surface of the support platform 41. A support mechanism 5 for supporting the trough of the guardrail panel is provided at one end of the support platform 41 near the welding machine 3. A pressing mechanism 6 for applying downward pressure to the top of the trough of the guardrail panel is provided at one end of the support platform 41 near the support mechanism 5.

[0030] Before welding the guardrail panels, it is necessary to center them, such as... Figure 6 As shown, the adjusting assembly 49 includes a first sliding frame 491, which is movably sleeved on the outer surface of the drive shaft 46. The inner wall of the first sliding frame 491 away from the drive shaft 46 is movably sleeved on the outer surface of the first fixed shaft 44. A sliding plate 493 is provided on the top of the first sliding frame 491, and the sliding plate 493 is slidably connected to the inner wall of the first sliding groove 47. A pull rod 492 is rotatably connected to the inner wall of the first sliding frame 491 via a rotating shaft. The end of the pull rod 492 away from the first sliding frame 491 is connected to the sliding plate 493. 93 Rotary connection, when the guardrail is centered, the motor 45 drives the transmission shaft 46 to rotate, thereby causing the first sliding frame 491 to move to the side of the downward pressing mechanism 6. During the movement of the first sliding frame 491, the sliding plate 493 is pulled along the first sliding groove 47 by the pull rod 492, thereby adjusting the distance between the support plate 494 and the flip plate 495 and the side of the guardrail. Because the sliding plates 493 on both sides of the guardrail move synchronously when the first sliding frame 491 moves, the centering and positioning adjustment of the guardrail can be completed.

[0031] A support plate 494 is fixedly connected to one end of the slide plate 493 near the guardrail. The support plate 494 is slidably connected to the inner wall of the second sliding groove 48. A flip plate 495 is rotatably connected to the inner wall of the slide plate 493 near the support plate 494 via a pivot. A buffer pad 496 is fixedly connected to the outer surface of the flip plate 495 near the guardrail. The buffer pad 496 contacts the outer surface of the guardrail and avoids rigid collision damage to the surface coating of the guardrail.

[0032] It is worth noting that the outer wall of the flip plate 495 is also fixedly connected to the connecting shaft 497. The connecting shaft 497 is slidably connected to the inner wall of the slide plate 493. The outer surface of the connecting shaft 497 is movably sleeved with a first spring 498. The first spring 498 is fixedly connected between the flip plate 495 and the slide plate 493. The first spring 498 is used to apply the squeezing force of the flip plate 495 on the side of the guardrail. When the guardrail of different specifications is centered and positioned, the flip plate 495 can swing adaptively around the pivot, which can adapt to the side profile of the guardrail of different specifications, thereby providing reliable lateral clamping for various corrugated plates.

[0033] When welding machine 3 continuously moves along the waveform contour to perform welding, the welding load on the peak and trough sections of the guardrail changes dynamically with the cross-sectional height. This can easily cause the guardrail to vibrate slightly during the welding operation. Figure 3 , Figure 9 As shown, the pressing mechanism 6 includes a third sliding frame 61. The bottom of the third sliding frame 61 is slidably connected to the inner wall of the groove 43. The third sliding frame 61 can slide horizontally along the groove 43 so as to adjust the overall installation position of the pressing mechanism 6 according to the lateral position of the guardrail trough. At the same time, a bolt is fixedly provided on the outer wall of the third sliding frame 61 near the groove 43. By tightening the bolt against the inner wall of the groove 43, the sliding friction resistance at the bottom of the third sliding frame 61 is increased, thereby achieving positioning and locking. A second threaded rod 62 is rotatably connected to the inner wall of the top of the third sliding frame 61. An adjusting frame 63 is movably sleeved on the outer surface of the second threaded rod 62. The second threaded rod 62 is used to adjust the vertical height of the adjusting frame 63 so that the pressing head 65 can be adapted to the trough height of guardrails of different specifications.

[0034] A force-bearing frame 64 is slidably connected to the inner wall of the adjusting frame 63. A pressure head 65 is fixedly connected to the bottom end of the force-bearing frame 64. A third spring 66 is provided between the force-bearing frame 64 and the pressure head 65. The two ends of the third spring 66 are fixedly connected to the force-bearing frame 64 and the pressure head 65, respectively. Since the pressure head 65 can only move in the vertical direction, and the third spring 66 forms a pre-compression when the pressure head 65 contacts the top surface of the trough of the guardrail, it provides a continuous downward elastic pressing force. Therefore, when a slight vibration occurs during the welding of the guardrail, the third spring 66 absorbs the vibration energy through elastic deformation, thereby preventing the vibration of the guardrail from being transmitted to the welding machine 3. Furthermore, the third spring 66, relying on its elasticity, can ensure that the pressure head 65 always remains in close contact with the workpiece as the waveform contour of the guardrail changes.

[0035] During the welding process of guardrail panels, because the trough areas are unsupported and suspended, the welding pressure is directly applied to the weak points of the guardrail panel, which can easily cause the guardrail panel to sag due to elasticity. Figures 7 to 8As shown, the support mechanism 5 includes a fixing block 501, with a top support block 504 movably inserted into the top of the fixing block 501. The top of the top support block 504 has a contoured surface that matches the contour of the trough of the guardrail, which can effectively increase the contact area with the bottom surface of the trough. Simultaneously, the top support block 504 can be replaced for guardrails of different specifications. Therefore, when welding the guardrail, a top support block 504 with the corresponding contoured surface can be installed, thereby providing support for the bottom of the welding area of ​​the guardrail and supporting the bottom of the trough peaks of the guardrail. A disc is fixedly connected to the bottom of the fixing block 501. The bottom of the disc spring assembly 502 is fixedly connected to a wedge block 503. It is worth noting that since the disc spring assembly 502 is set between the fixed block 501 and the wedge block 503, the disc spring assembly 502 relies on its nonlinear stiffness characteristics to make the top support block 504 form a flexible support when it initially contacts the guardrail, so as to avoid the impact of the guardrail during the installation process from damaging the surface of the workpiece. At the same time, when the welding pressure of the welding machine 3 is applied to the trough area, the pressure causes the disc spring assembly 502 to gradually transform into a rigid support, thereby ensuring stable support for the trough area during the welding process.

[0036] A second sliding frame 505 is provided on the outside of the wedge block 503. The second sliding frame 505 has an inclined surface that matches the inclined surface of the wedge block 503. It is used to lift the fixed block 501 through the inclined surface engagement. A second spring 509 is fixedly connected to one outer wall of the second sliding frame 505. The second spring 509 is used to reset the sliding frame 505 after it moves. The end of the second spring 509 away from the second sliding frame 505 is fixedly connected to the inner wall of the support platform 41. A second fixed shaft 506 is fixedly connected to the end of the second sliding frame 505 away from the second spring 509. The second fixed shaft 506 is slidably connected to the inner wall of the support platform 41. The second fixed shaft 506 is used to constrain the horizontal sliding direction of the second sliding frame 505 to ensure the accuracy of the inclined surface engagement.

[0037] A first threaded rod 507 is rotatably connected to the middle position of the second sliding frame 505. A nut 508 is movably sleeved on the outer surface of the end of the first threaded rod 507 away from the second sliding frame 505. The nut 508 is used to adjust the sliding stroke of the second sliding frame 505 and to limit the lowering height of the fixed block 501. The nut 508 abuts against the side wall of the support platform 41. Rotating the nut 508 can cause the first threaded rod 507 to drive the second sliding frame 505 to move horizontally, thereby adjusting the initial position of the second sliding frame 505, changing the initial engagement position of the wedge block 503 and the inclined surface of the second sliding frame 505 and the sliding stroke, and completing the position preset of the top support block 504, so that the support mechanism 5 can adapt to the wave guardrail with different wave depths.

[0038] This invention encompasses any substitutions, modifications, equivalent methods, and solutions made within the spirit and scope of this invention. To provide the public with a thorough understanding of this invention, specific details are described in detail in the following preferred embodiments; however, those skilled in the art will fully understand the invention even without these details. Furthermore, to avoid unnecessary misunderstanding of the essence of this invention, well-known methods, processes, procedures, components, and circuits are not described in detail.

[0039] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A positioning fixture for automated welding of guardrail panels, comprising a welding table (1), a movable frame (2) slidably disposed on the top of the welding table (1), and a welding machine (3) disposed at the output end of the movable frame (2), characterized in that, The top of the welding table (1) is provided with a positioning mechanism (4) for supporting the guardrail panel. The positioning mechanism (4) includes: A support platform (41) is detachably installed on the top of the welding platform (1). A groove (43) is provided on one side of the outer surface of the support platform (41). A motor (45) is fixedly connected to the outer surface of the support platform (41) away from the groove (43). A transmission shaft (46) is fixedly connected to the output end of the motor (45). A first fixed shaft (44) is fixedly connected to the inner wall of the support platform (41). A pad (42) is fixedly connected to the top of the support platform (41). An adjustment component (49) for centering the guardrail is provided at the output end of the motor (45). A first sliding groove (47) and a second sliding groove (48) are provided on the top outer surface of the support platform (41). A support mechanism (5) for supporting the trough of the guardrail is provided at one end of the support platform (41) near the welding machine (3). A pressing mechanism (6) for applying downward pressure to the top of the trough of the guardrail is provided at one end of the support platform (41) near the support mechanism (5).

2. The positioning fixture for automated welding of guardrail panels according to claim 1, characterized in that, The adjustment assembly (49) includes a first sliding frame (491), which is movably sleeved on the outer surface of the drive shaft (46). The inner wall of the first sliding frame (491) away from the drive shaft (46) is movably sleeved on the outer surface of the first fixed shaft (44). A sliding plate (493) is provided on the top of the first sliding frame (491). The sliding plate (493) is slidably connected to the inner wall of the first sliding groove (47). A pull rod (492) is rotatably connected to the inner wall of the first sliding frame (491) through a rotating shaft. The end of the pull rod (492) away from the first sliding frame (491) is rotatably connected to the sliding plate (493).

3. The positioning fixture for automated welding of guardrail panels according to claim 2, characterized in that, The slide plate (493) is fixedly connected to a support plate (494) at one end near the guardrail. The support plate (494) is slidably connected to the inner wall of the second sliding groove (48). The inner wall of the slide plate (493) near the support plate (494) is rotatably connected to a flip plate (495) via a pivot. The outer surface of the flip plate (495) near the guardrail is fixedly connected to a buffer pad (496), which is in contact with the outer surface of the guardrail.

4. The positioning fixture for automated welding of guardrail panels according to claim 3, characterized in that, The outer wall of the flip plate (495) is also fixedly connected to a connecting shaft (497), which is slidably connected to the inner wall of the slide plate (493). A first spring (498) is movably sleeved on the outer surface of the connecting shaft (497). The first spring (498) is fixedly connected between the flip plate (495) and the slide plate (493). The first spring (498) is used to apply the squeezing force of the flip plate (495) on the side of the guardrail.

5. The positioning fixture for automated welding of guardrail panels according to claim 1, characterized in that, The support mechanism (5) includes a fixed block (501), a top support block (504) is movably inserted into the top of the fixed block (501), the outer surface of the top support block (504) is adapted to the bottom of the guardrail and is used to support the bottom of the valley peak of the guardrail, a disc spring assembly (502) is fixedly connected to the bottom of the fixed block (501), and a wedge block (503) is fixedly connected to the bottom of the disc spring assembly (502).

6. The positioning fixture for automated welding of guardrail panels according to claim 5, characterized in that, The wedge block (503) is provided with a second sliding frame (505) on its outside. The second sliding frame (505) has an inclined surface that is adapted to the inclined surface of the wedge block (503) for lifting the fixed block (501) by means of the inclined surface. A second spring (509) is fixedly connected to one side of the outer wall of the second sliding frame (505). The end of the second spring (509) away from the second sliding frame (505) is fixedly connected to the inner wall of the support platform (41).

7. The positioning fixture for automated welding of guardrail panels according to claim 6, characterized in that, The second sliding frame (505) is fixedly connected to a second fixed shaft (506) at one end away from the second spring (509), and the second fixed shaft (506) is slidably connected to the inner wall of the support platform (41).

8. The positioning fixture for automated welding of guardrail panels according to claim 7, characterized in that, The second sliding frame (505) is rotatably connected to a first threaded rod (507) at its middle position. A nut (508) is movably sleeved on the outer surface of the end of the first threaded rod (507) away from the second sliding frame (505). The nut (508) is used to adjust the sliding stroke of the second sliding frame (505) and to limit the lowering height of the fixed block (501).

9. The positioning fixture for automated welding of guardrail panels according to claim 1, characterized in that, The pressing mechanism (6) includes a third sliding frame (61), the bottom of which is slidably connected to the inner wall of the groove (43), and the top inner wall of the third sliding frame (61) is rotatably connected to a second threaded rod (62), and the outer surface of the second threaded rod (62) is movably sleeved with an adjusting frame (63).

10. The positioning fixture for automated welding of guardrail panels according to claim 9, characterized in that, The inner wall of the adjusting frame (63) is slidably connected to a force-bearing frame (64), and a pressure head (65) is fixedly connected to the bottom end of the force-bearing frame (64). A third spring (66) is provided between the force-bearing frame (64) and the pressure head (65). The two ends of the third spring (66) are fixedly connected to the force-bearing frame (64) and the pressure head (65) respectively. The third spring (66) is used to absorb the vibration generated by the guardrail during the welding operation.

Images