Self-balancing low-clearance small-radius bridge erecting machine supporting leg steering device

Abstract

The invention provides a self-balancing low-clearance small-radius bridge erecting machine supporting leg steering device, and relates to the technical field of bridge erecting machines, the self-balancing low-clearance small-radius bridge erecting machine supporting leg steering device comprises a rotating seat and a rotating rod, the rotating seat is fixedly arranged on a middle supporting leg, the rotating rod is fixedly arranged on a beam base below a main beam, and the rotating rod is rotatably installed on the rotating seat in the vertical direction; a pair of locking plates are fixedly arranged on the middle supporting leg in a manner of being symmetrical about the center of the rotating rod, the locking plates are arc-shaped, and the arc-shaped concave surfaces of the locking plates face the rotating rod; a swing rod is hinged to the beam base, a friction block is arranged on the side, close to the locking plate, of the swing rod, a lifting path is arranged on the rotating seat, and when the beam base rotates along the rotating seat, the swing rod can be driven to swing up and down along the lifting path, so that the friction block rubs against the locking plate, and the position of the beam base is locked at a preset rotating angle; the middle supporting leg is further provided with an adjusting piece which is used for adjusting the radian of the locking plate and fixing the locking plate to the adjusted radian. According to the invention, the operation safety of the bridge girder erection machine in a complex field environment can be improved.

Description

Technical Field

[0001] This invention relates to the field of bridge erecting machine technology, and more specifically, to a self-balancing, low-headroom, small-radius bridge erecting machine outrigger steering device. Background Technology

[0002] Bridge erecting machines, as key large-scale equipment in bridge construction, are widely used in the erection of precast beams. Typically, a bridge erecting machine includes main structures such as front auxiliary legs, front legs and their traverse tracks, middle legs and their traverse tracks, the main beam, a gantry crane, movable rear legs, and fixed rear legs. The middle legs are usually rotatably connected to the main beam and drive the main beam to rotate horizontally via a motor or hydraulic drive system. This adapts to the erection requirements of bridges with different radii of curvature, and is particularly crucial in small-radius turning operations.

[0003] However, with the increase in the span and load capacity of the main beam, its own mass and the weight of the crane it carries have increased significantly, resulting in large system inertia and delayed response when performing turning actions. Especially when encountering wind disturbances or operational errors, the main beam is prone to problems such as excessive sway and unstable angle control, posing significant safety hazards. Summary of the Invention

[0004] The purpose of this invention is to provide a self-balancing, low-headroom, small-radius bridge erecting machine outrigger steering device, which can improve the operational safety of the bridge erecting machine in complex field environments.

[0005] This invention is achieved through the following technical solution:

[0006] A self-balancing, low-headroom, small-radius bridge erecting machine outrigger steering device includes a pivot seat and a rotating rod. The pivot seat is fixedly mounted on the middle outrigger, and the rotating rod is fixedly mounted on the beam base below the main beam. The rotating rod is vertically rotatable on the pivot seat. A pair of locking plates are centrally symmetrically fixedly mounted on the middle outrigger with respect to the rotating rod. The locking plates are arc-shaped, with their concave surfaces facing the rotating rod.

[0007] A swing rod is hinged to the beam base, and a friction block is provided on the side of the swing rod near the locking plate. A lifting path is provided on the rotating seat. When the beam base rotates along the rotating seat, the swing rod can be driven to swing up and down along the lifting path so that the friction block rubs against the locking plate and locks the position of the beam base at a predetermined rotation angle.

[0008] The middle support leg is also provided with an adjusting component, which is used to adjust the curvature of the locking plate and fix the locking plate to the adjusted curvature.

[0009] Furthermore, the locking plate is inclined on the side near the rotating seat, the friction block is provided with a friction inclined surface corresponding to the inclined surface of the locking plate, the beam base is provided with a guide cylinder, the friction block is slidably connected to the guide cylinder, and the friction block and the swing rod are hinged to each other.

[0010] Furthermore, the adjusting component includes a threaded rod, an adjusting rod, and a pair of connecting rods. The threaded rod is arranged along the length direction of the middle support leg. A seat is fixedly arranged on the middle support leg. The threaded rod is rotatably connected to the seat. The adjusting rod is threadedly connected to the threaded rod. Sliding blocks are slidably engaged on both sides of the locking plate along the length direction. The two ends of the pair of connecting rods are respectively hinged to the two ends of the adjusting rod and the two sliding blocks.

[0011] Furthermore, the locking plate has multiple deformation grooves along its length on the side near the rotating base, the bottom of the deformation grooves has an enlarged circular groove, and the middle position of the locking plate is rotatably connected to the middle support leg via a rotating shaft.

[0012] Furthermore, a housing is provided on the middle support leg and on the side of the locking plate away from the rotating seat. An inflatable airbag is provided inside the housing and abuts against the locking plate.

[0013] Furthermore, a V-shaped spring is provided between the connecting rod and the locking plate, with one end of the V-shaped spring fixedly connected to the connecting rod and the other end fixedly connected to the locking plate;

[0014] And / or, the sliding block is fixedly provided with abutment portions at both ends, the abutment portion near the locking plate is provided with an arc, and the arc portion of the abutment portion abuts against the locking plate.

[0015] Furthermore, an extension plate is fixedly provided on the side of the middle support leg, and a reinforcing rib is provided between the extension plate and the middle support leg. Multiple guide grooves are opened on the top wall of the extension plate, and the length direction of the guide grooves intersects the axis of the rotating seat. Multiple guide posts are fixedly provided on the locking plate corresponding to the multiple guide grooves. The guide posts are slidably connected in the guide grooves. At the same time, a rotating post is also fixedly provided on the rotating shaft of the connecting rod and the sliding block. The rotating post is slidably connected in one of the guide grooves.

[0016] Furthermore, a guide ring is coaxially fixed on the rotating base, and a wave-shaped lifting arc surface is symmetrically arranged on the top wall of the guide ring along the center. One end of the swing rod abuts against the lifting arc surface, and a swing seat is fixed on the beam base, with the swing rod hinged to the swing seat.

[0017] Furthermore, a return spring is provided between the beam base and the swing rod, and the return spring is used to drive the swing rod to remain in contact with the lifting arc surface.

[0018] Furthermore, the extension plate is provided with a limiting post, which is used to limit the maximum arc position of the locking plate. The limiting post is provided with a limiting bolt threaded onto the extension plate, and the extension plate is provided with a plurality of threaded holes for the limiting bolt to be threadedly connected.

[0019] The technical solution of the present invention has at least the following advantages and beneficial effects:

[0020] 1. This invention separates the rotation fulcrum of the main beam from the braking structure by setting up a rotating rod, a rotating seat, a swing rod, a friction block, and a pair of symmetrically distributed arc-shaped locking plates. Instead of using the traditional single-point braking method, it significantly expands the range of braking force by utilizing the structural feature of the locking plates being installed along the width of the main beam. This allows the friction braking effect to cover a wider cross-sectional area of ​​the main beam, thereby effectively dispersing the braking load and reducing the risk of local structural impact or wear caused by concentrated braking.

[0021] Specifically, during the rotation of the beam base, the hinged swing rod swings up and down, causing the friction block to make vertical contact friction with the locking plate under the guidance of the lifting path. Compared with the traditional horizontal sliding braking method, vertical friction contact makes it easier to achieve self-locking, clamping, and limiting of the structure. Its contact direction is consistent with the direction of the concave surface of the locking plate, which helps to improve friction stability and locking reliability. In addition, the vertical braking structure can automatically complete braking and positioning without complex active control by relying on gravity and system inertia, simplifying the control logic, reducing operating energy consumption, and enhancing the system's response capability and braking safety under sudden disturbances. Through the above structural collaboration, the swaying, overshoot, and angular deviation of the main beam during rotation can be effectively suppressed, improving steering accuracy and system stability, thereby improving the operational safety and construction efficiency of the bridge erecting machine in complex site environments. Attached Figure Description

[0022] Figure 1 A schematic diagram of the overall structure of a self-balancing low-headroom, small-radius bridge erecting machine outrigger steering device provided by the present invention;

[0023] Figure 2 This invention aims to illustrate the structural diagrams of the middle support leg, beam base, and main beam;

[0024] Figure 3 This is a schematic diagram illustrating the structure of the swing arm and locking plate of this invention;

[0025] Figure 4This invention is intended to illustrate the structure of the swing arm, locking plate, and lifting path.

[0026] Figure 5 This is a schematic diagram illustrating the structure of the adjusting component, the inflatable airbag, the V-shaped spring, and the locking plate.

[0027] Figure 6 This is a schematic diagram illustrating the structure of the adjusting member, locking plate, and guide post of this invention;

[0028] Reference numerals: 100-Middle support leg, 101-Rotating seat, 102-Lifting path, 103-Seat body, 104-Outer extension plate, 1041-Guide groove, 1042-Threaded hole, 105-Reinforcing rib, 106-Guide ring, 1061-Lifting arc surface, 110-Transverse track, 120-Heavy crane, 130-Movable rear support leg, 140-Fixed rear support leg, 150-Front auxiliary support leg, 160-Front support leg, 200-Main beam, 210-Beam base, 2101-Swing seat, 211-Rotating rod, 212-Swinging rod, 213-Friction Block, 2131-Friction inclined surface, 214-Guide cylinder, 300-Locking plate, 301-Clamping strip, 302-Deformation groove, 3021-Expanding circular groove, 303-Rotating shaft, 304-Guide post, 310-Sliding block, 311-Clamping groove, 312-Abutting part, 400-Adjusting component, 401-Threaded rod, 402-Adjusting rod, 403-Connecting rod, 4031-Rotating post, 500-Box body, 501-Inflating airbag, 600-V-shaped spring, 700-Reset spring, 800-Limiting post, 810-Limiting bolt, 900-Pillar. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0031] The following is for reference Figures 1-6As shown in the figure, and further illustrated with specific embodiments, this embodiment provides a self-balancing, low-headroom, small-radius bridge erecting machine with outrigger steering device. The bridge erecting machine includes a front auxiliary outrigger 150, a front outrigger 160 and its transverse track 110, a middle outrigger 100 and its transverse track 110, a main beam 200, a crane 120, a movable rear outrigger 130, and a fixed rear outrigger 140, among other main structures. The main beam 200 is the core load-bearing component of the bridge erecting machine, spanning multiple sets of outriggers at both ends. During the erection process, it needs to complete the path steering of small-radius curved bridges. Typically, a rotating connection structure is provided between the middle outrigger 100 and the main beam 200, and a motor or hydraulic drive device (not shown in the figure) installed on the main beam 200 is used to achieve limited-angle rotation of the main beam 200 in the horizontal plane. To address the issues of large rotational inertia and response lag caused by the large span and heavy load of the main beam 200, especially the phenomenon of excessive swaying of the main beam 200 under wind load interference or misoperation, this steering device is designed to improve the controllability of the attitude and the stability of the rotation angle of the main beam 200.

[0032] Specifically, the bridge erecting machine's outrigger steering device includes a rotating base 101 and a rotating rod 211. The rotating base 101 is fixedly installed on the middle outrigger 100, serving as a fixed reference support. The rotating rod 211 is fixedly installed on the beam base 210 below the main beam 200, serving as the axial structure for the steering of the main beam 200. The rotating rod 211 is vertically rotatably installed in the rotating base 101 and can drive the beam base 210 to rotate around the center of the rotating base 101 under the drive of the main beam 200. The structural combination of the rotating base 101 and the rotating rod 211 ensures a stable rotational connection between the main beam 200 and the middle outrigger 100. To prevent the main beam 200 from deviating from its target position due to excessive inertia during rotation, a pair of locking plates 300 are symmetrically installed on both sides of the rotating base 101. The locking plates 300 are arranged in an arc shape, and the concave surface of the arc always faces the rotating rod 211, providing effective limit control and friction locking function when the main beam 200 rotates.

[0033] A swing rod 212 is hinged to the beam base 210. The structure of the swing rod 212 allows it to maintain a certain relative motion relationship with the locking plate 300 below during the rotation of the main beam 200. A friction block 213 is installed on the side of the swing rod 212 near the locking plate 300. The friction block 213 is an active braking element, and its structure matches the contour of the locking plate 300. A lifting path 102 is preset on the rotating base 101 for the swing rod 212 to move along. When the main beam 200 rotates, it drives the beam base 210 to rotate around the rotating rod 211. During this process, the swing rod 212 swings up and down under the guidance of the lifting path 102, so that the friction block 213 makes continuous contact with the arc-shaped locking plate 300 in the vertical direction and forms friction braking at a predetermined angle position. Because the locking plate 300 is arc-shaped, the rotation trajectory of the friction block 213 is highly consistent with the curved surface of the locking plate 300, thus ensuring a large contact area, uniform friction, and reliable locking throughout the entire friction braking process, avoiding the structural impact problem caused by concentrated braking in traditional single-point braking.

[0034] An adjusting component 400 is further provided on the middle support leg 100. The adjusting component 400 is used to control the curvature change of the locking plate 300 and fix the locking plate 300 in the adjusted state. By adjusting the curvature of the locking plate 300, the maximum rotation range of the beam base 210 can be limited, thereby adapting to the steering requirements of bridge types with different curvature radii, ensuring that the main beam 200 does not over-limit mis-rotate during rotation, and improving the stability of steering.

[0035] Reference Figure 3 and Figure 4 As shown, the locking plate 300 is inclined near the rotating base 101, enhancing its guiding and covering ability for the friction block 213 and improving the dynamic adaptability during braking. A corresponding friction inclined surface 2131 is provided on the friction block 213, which closely cooperates with the inclined surface of the locking plate 300, achieving a structural characteristic of transitioning from line contact to surface contact and improving the uniformity of braking force distribution. To control the running path of the friction block 213, a vertically arranged guide cylinder 214 is welded to the beam base 210. The guide cylinder 214 is a channel structure that restricts the up-and-down swing trajectory of the friction block 213, ensuring that the friction block 213 remains within the range of action of the locking plate 300 during rotation. The friction block 213 and the swing rod 212 are hinged, allowing for slight attitude adjustments during guidance based on force, reducing uneven wear.

[0036] Reference Figure 5 and Figure 6As shown, the adjusting component 400 includes a threaded rod 401, an adjusting rod 402, and a pair of connecting rods 403. The threaded rod 401 is arranged along the length of the middle support leg 100 to provide controllable displacement output. A seat 103 is fixedly installed on the outside of the middle support leg 100 as a rotational support base for the threaded rod 401. The adjusting rod 402 and the threaded rod 401 are connected by a thread to form a forward and backward adjustment relationship. Rotating the threaded rod 401 drives the adjusting rod 402 to translate axially. The two sides of the locking plate 300 are connected to the adjusting rod 402 through sliding blocks 310. The pair of connecting rods 403 are respectively hinged between the two ends of the adjusting rod 402 and the sliding blocks 310 to form a linkage mechanism, which, in conjunction with sliding, realizes the synchronous adjustment of the curvature of the locking plate 300.

[0037] It should be noted that, to improve adjustment accuracy and operational stability, the threaded rod 401 preferably uses a fine-pitch threaded rod structure with a small pitch. This structure has excellent self-locking capability, preventing loosening after adjustment. Simultaneously, due to the small pitch, the operator can achieve precise control of the angle of the locking plate 300 through minute rotation. Specifically, the sliding block 310 is integrally provided with a T-shaped or dovetail-shaped retaining strip 301, and the locking plate 300 has a corresponding retaining groove 311. The two slide and engage in a locking mechanism, effectively preventing detachment or slippage during adjustment and improving structural stability.

[0038] In other embodiments, the adjusting member 400 can also be replaced by a cylinder structure, controlling the extension and retraction of the adjusting rod 402 by air pressure, or using a pair of cylinders to control the movement of both ends of the locking plate 300 respectively, to achieve automated and rapid adjustment. Furthermore, to assist in on-site angle control, angle gauges and reference gauges can be installed on the outside of the middle outrigger 100, allowing the operator to intuitively determine the locking range and brake starting position during adjustment, improving adjustment efficiency and accuracy.

[0039] Furthermore, the locking plate 300 has multiple deformation grooves 302 along its length on the side near the rotating base 101. These grooves are regularly spaced and designed to guide the locking plate 300 to elastically deform along a predetermined path when the structure is under stress, thereby enhancing its ability to adapt to changing shapes. Each deformation groove 302 has an enlarged circular groove 3021 at its bottom. This enlarged circular groove 3021 not only prevents stress concentration leading to localized tearing but also provides a certain stress buffer space, allowing the locking plate 300 to bend and deform more gently when subjected to the force of the adjusting member 400 or the friction block 213. Simultaneously, the deformation grooves 302 also serve a function of frictional heat dissipation.

[0040] Because the locking plate 300 is rotatably connected to the middle support leg 100 via the rotating shaft 303 at its center, the locking plate 300 has a certain degree of freedom in its overall structure. It can undergo a bow-like bending deformation around the rotating shaft 303, thereby achieving controllable and smooth deformation control in conjunction with the linear push of the adjusting component 400. This "bow-like structure" design allows the locking plate 300 to actively adapt to changes in curvature under the action of force, improving the accuracy and stability of friction positioning while reducing the energy consumption required for adjustment.

[0041] Reference Figure 5 As shown, a housing 500 is installed on the middle support leg 100, on the side of the locking plate 300 away from the pivot 101. The housing 500 is a hollow shell structure with an opening near the locking plate 300 to facilitate contact between internal components and the locking plate 300. An inflatable airbag 501 is installed inside the housing 500. The airbag is preferably made of flexible rubber and can be inflated with compressed gas, such as air or inert gas, using an external air pump. The outer surface of the inflatable airbag 501 abuts against the locking plate 300. When inflated, it expands and presses against the locking plate 300, thus providing auxiliary support and constraint for the locking plate 300. This structure, based on the action of the adjusting component 400, further stabilizes the deformation of the locking plate 300, preventing structural displacement due to vibration or rebound, and ensuring the durability and accuracy of the locking arc. Simultaneously, the inflatable airbag 501 has a certain buffering elasticity, which can also absorb the vibration and impact force of the main beam 200 during rotation and braking, extending the service life of various components.

[0042] Furthermore, a V-shaped spring sheet 600 is installed between the connecting rod 403 and the locking plate 300. The V-shaped spring sheet 600 is preferably made of high-elasticity metal or composite material, possessing good resilience and fatigue resistance. One end of the V-shaped spring sheet 600 is fixedly connected to the connecting rod 403, and the other end is fixedly connected to the locking plate 300. During adjustment, the V-shaped spring sheet 600 stretches or compresses synchronously with the movement of the connecting rod 403, thereby providing auxiliary thrust or reverse support when the locking plate 300 is deformed under force. This spring sheet structure enhances the rebound control capability of the locking plate 300 and also serves as a force transmission buffer element, flexibly transmitting the adjustment force output by the connecting rod 403 to the locking plate 300, effectively avoiding the impact stress concentration caused by rigid connections, making the arc adjustment process of the locking plate 300 more stable and precise.

[0043] As an optional embodiment, the sliding block 310 has abutment portions 312 fixedly welded to both ends. The abutment portions 312 are reinforcing structural elements used to limit the swing amplitude and lateral displacement of the locking plate 300 in the sliding path. The end of the abutment portion 312 near the locking plate 300 is arc-shaped, and the arc portion is tangent to the curvature of the outer contour of the locking plate 300, achieving a stable fit between the abutment portion 312 and the locking plate 300. This structural arrangement not only improves the force symmetry of the locking plate 300 during the curvature adjustment process but also provides an auxiliary support platform for the locking plate 300, preventing local twisting or warping due to its own weight or lateral disturbances during adjustment or operation. The contact between the abutment portion 312 and the locking plate 300 serves both a restraining and guiding function as well as a stress dispersion function, helping to extend the service life and structural reliability of the locking plate 300.

[0044] Reference Figure 4 and Figure 5 As shown, an extension plate 104 is welded to the side of the middle support leg 100. The extension plate 104 is preferably a rectangular steel plate structure, with two plates on each side of the middle support leg 100, for a total of four extension plates 104, which are centrally symmetrically distributed around the swivel seat 101. This structure helps to evenly bear the radial component force generated by the locking plate 300 during adjustment or stress. In order to improve the rigidity and stability of the extension plate 104 when subjected to lateral adjustment loads, multiple reinforcing ribs 105 are provided between the extension plate 104 and the middle support leg 100. The reinforcing ribs 105 can be in the form of triangular reinforcing plates, arranged along the weld seam to form a reinforcing structure that resists bending and shearing, thereby preventing the extension plate 104 from deforming or detaching under vibration or repeated loading conditions.

[0045] Multiple guide grooves 1041 are formed on the top wall of the extension plate 104. Each guide groove 1041 has a narrow and long strip structure, and its length direction is intersecting the axis of the rotating base 101 to form a transverse guide channel. The locking plate 300 is fixedly provided with multiple guide posts 304 at the positions corresponding to the multiple guide grooves 1041. Each guide post 304 is vertically installed on the back of the locking plate 300 and slidably connected in the guide groove 1041. It is used to provide a stable guide trajectory during the deformation of the locking plate 300, prevent the locking plate 300 from shifting, tilting or twisting due to uneven force or fit deviation, and enhance its force symmetry and adjustment controllability.

[0046] Meanwhile, a rotating column 4031 is also fixedly installed on the rotating shaft of the connecting rod 403 and the sliding block 310. The rotating column 4031 is also slidably connected to one of the guide grooves 1041, forming an auxiliary guide rail system. This system restricts and guides the movement direction of the series structure, ensuring accurate transmission of adjustment actions and preventing skewing due to excessive freedom. The overall structure, through a multi-point sliding guide mechanism of "guide groove 1041 + guide column 304 + rotating column 4031", achieves stable force distribution on the locking plate 300 and the adjusting component 400 during deformation and expansion, ensuring that the locking plate 300 can produce uniform and controllable arc changes, and preventing unexpected deformation due to localized force concentration.

[0047] Reference Figure 2 and Figure 4 As shown, a guide ring 106 is coaxially welded to the rotating base 101. This guide ring 106 is sleeved around the rotating rod 211, serving a combined function of position guidance and support. The top wall of the guide ring 106 has a wavy lifting arc surface 1061 symmetrically arranged along its center. This arc surface exhibits continuously varying height undulations, providing a non-linear lifting path 102 for the swing rod 212. One end of the swing rod 212 abuts against the lifting arc surface 1061. During the rotation of the main beam 200, the guide ring 106 is actually stationary, allowing the end of the swing rod 212 to slide up and down along the wavy surface. This enables the friction block 213 to periodically contact and separate from the locking plate 300, completing the structural self-locking and release functions.

[0048] To improve the stability and responsiveness of the swing motion, a swing seat 2101 is fixedly installed on the beam base 210, and the swing rod 212 is hinged on the swing seat 2101. This structure moves the rotation fulcrum of the swing rod 212 forward to a position closer to the locking plate 300, effectively extending the lever arm length of the swing rod 212 on the guide ring 106, and improving the pressing efficiency and braking effect between the friction block 213 and the locking plate 300.

[0049] Furthermore, a return spring 700 is provided between the beam base 210 and the swing rod 212. This spring is used to quickly return the swing rod 212 to its initial state after the friction block 213 disengages from the locking plate 300, keeping its end continuously abutting against the lifting arc surface 1061, thereby realizing the continuity of structural movement and automatic cycling capability.

[0050] In other embodiments, the return spring 700 can be replaced with elastic limiting structures such as rubber blocks, spring sheets, and corrugated steel strips, depending on the actual installation conditions, to achieve an equivalent elastic support effect, while also possessing good durability and low maintenance, making it suitable for long-term operation in harsh construction site environments.

[0051] Reference Figure 5As shown, limit posts 800 are installed on the extension plate 104. The limit posts 800 are preferably positioned at symmetrical ends along the maximum bending path of the locking plate 300. This physical limitation controls the maximum deformation of the locking plate 300, preventing instability or plastic deformation due to over-adjustment or excessive force. To achieve adjustable position, limit bolts 810 are threaded onto the limit posts 800 and connected to the extension plate 104. The extension plate 104 has multiple appropriately distributed threaded holes 1042. Operators can select the appropriate threaded hole 1042 position according to different locking curvature requirements to quickly adjust and position the limit posts 800. This improves structural safety and enhances adjustment flexibility, facilitating adaptation to steering requirements under different curvature radii.

[0052] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A self-balancing, low-headroom, small-radius bridge erecting machine outrigger steering device, characterized in that, The system includes a rotating base (101) and a rotating rod (211). The rotating base (101) is fixedly mounted on the middle support leg (100), and the rotating rod (211) is fixedly mounted on the beam base (210) below the main beam (200). The rotating rod (211) is rotatably mounted on the rotating base (101) in a vertical direction. A pair of locking plates (300) are fixedly mounted on the middle support leg (100) symmetrically with respect to the rotating rod (211). The locking plates (300) are arc-shaped, and their arc-shaped concave surfaces face the rotating rod (211). A swing rod (212) is hinged to the beam base (210). A friction block (213) is provided on the side of the swing rod (212) near the locking plate (300). A lifting path (102) is provided on the rotating seat (101). When the beam base (210) rotates along the rotating seat (101), the swing rod (212) can be driven to swing up and down along the lifting path (102) so that the friction block (213) rubs against the locking plate (300) and locks the position of the beam base (210) at a predetermined rotation angle. The middle support leg (100) is also provided with an adjusting member (400), which is used to adjust the curvature of the locking plate (300) and fix the locking plate (300) to the adjusted curvature.

2. The self-balancing low-headroom, small-radius bridge erecting machine outrigger steering device according to claim 1, characterized in that, The locking plate (300) is inclined on the side near the rotating seat (101). The friction block (213) is provided with a friction inclined surface (2131) corresponding to the inclined surface of the locking plate (300). The beam base (210) is provided with a guide cylinder (214). The friction block (213) is slidably connected to the guide cylinder (214). The friction block (213) and the swing rod (212) are hinged to each other.

3. The self-balancing low-headroom, small-radius bridge erecting machine outrigger steering device according to claim 1, characterized in that, The adjusting component (400) includes a threaded rod (401), an adjusting rod (402), and a pair of connecting rods (403). The threaded rod (401) is arranged along the length direction of the middle support leg (100). A seat (103) is fixedly arranged on the middle support leg (100). The threaded rod (401) is rotatably connected to the seat (103). The adjusting rod (402) is threadedly connected to the threaded rod (401). The locking plate (300) is slidably engaged with sliding blocks (310) on both sides along the length direction. The two ends of the pair of connecting rods (403) are respectively hinged to the two ends of the adjusting rod (402) and the two sliding blocks (310).

4. The self-balancing low-headroom, small-radius bridge erecting machine outrigger steering device according to claim 3, characterized in that, The locking plate (300) has multiple deformation grooves (302) along its length on the side near the rotating seat (101). The bottom of the deformation groove (302) has an enlarged circular groove (3021), and the middle position of the locking plate (300) is rotatably connected to the middle support leg (100) through a rotating shaft (303).

5. The self-balancing low-headroom, small-radius bridge erecting machine outrigger steering device according to claim 4, characterized in that, A housing (500) is provided on the middle support leg (100) and on the side of the locking plate (300) away from the rotating seat (101). An inflatable airbag (501) is provided inside the housing (500) and abuts against the locking plate (300).

6. The self-balancing low-headroom, small-radius bridge erecting machine outrigger steering device according to claim 3, characterized in that, A V-shaped spring piece (600) is provided between the connecting rod (403) and the locking plate (300). One end of the V-shaped spring piece (600) is fixedly connected to the connecting rod (403), and the other end is fixedly connected to the locking plate (300). And / or, the sliding block (310) is fixedly provided with abutment portions (312) at both ends, and the abutment portion (312) near the locking plate (300) is provided in an arc shape, and the arc portion of the abutment portion (312) abuts against the locking plate (300).

7. The self-balancing low-headroom, small-radius bridge erecting machine outrigger steering device according to claim 3, characterized in that, An extension plate (104) is fixedly provided on the side of the middle support leg (100). A reinforcing rib (105) is provided between the extension plate (104) and the middle support leg (100). Multiple guide grooves (1041) are opened on the top wall of the extension plate (104). The length direction of the guide grooves (1041) intersects the axis of the rotating seat (101). Multiple guide posts (304) are fixedly provided on the locking plate (300) corresponding to the multiple guide grooves (1041). The guide posts (304) are slidably connected in the guide grooves (1041). At the same time, a rotating post (4031) is also fixedly provided on the rotating shaft of the connecting rod (403) and the sliding block (310). The rotating post (4031) is slidably connected in one of the guide grooves (1041).

8. The self-balancing low-headroom, small-radius bridge erecting machine outrigger steering device according to claim 1, characterized in that, A guide ring (106) is coaxially fixed on the rotating base (101). The top wall of the guide ring (106) is symmetrically provided with a wave-shaped lifting arc surface (1061) along the center. One end of the swing rod (212) is abutted on the lifting arc surface (1061). A swing seat (2101) is fixed on the beam base (210). The swing rod (212) is hinged on the swing seat (2101).

9. The self-balancing low-headroom, small-radius bridge erecting machine outrigger steering device according to claim 8, characterized in that, A return spring (700) is provided between the beam base (210) and the swing rod (212), and the return spring (700) is used to drive the swing rod (212) to remain in contact with the lifting arc surface (1061).

10. The self-balancing low-headroom, small-radius bridge erecting machine outrigger steering device according to claim 7, characterized in that, The extension plate (104) is provided with a limiting post (800), which is used to limit the maximum arc position of the locking plate (300). A limiting bolt (810) threadedly connected to the extension plate (104) is provided on the limiting post (800). The extension plate (104) is provided with a plurality of threaded holes (1042) for threaded connection of the limiting bolt (810).

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