Intelligent positioning system for railway prefabricated box girder reinforcing mesh

Abstract

The invention relates to the technical field of prefabricated box girder reinforcing mesh positioning devices, and provides a railway prefabricated box girder reinforcing mesh intelligent positioning system which is characterized in that when a lifting appliance moves to the position near a prefabricated box girder reinforcing mesh positioning point, the real-time position of each grabbing mechanism can be mastered through a GPS positioning module installed on the corresponding grabbing mechanism, and the real-time position of each grabbing mechanism can be determined through a GPS positioning module installed on the corresponding grabbing mechanism; and real-time position tracking is carried out on the grabbing mechanism. A grabbing mechanism is moved downwards by starting a first electric hydraulic device, a prefabricated box girder reinforcing mesh is lowered, similarly, the distance between a laser range finder and a falling point is monitored in real time through the laser range finder, and in the process that the grabbing mechanism moves downwards along with a displacement plate, the distance between the laser range finder and the falling point is monitored in real time. And data monitored by the laser range finders are sent to external control equipment, and when the real-time distance monitored by the laser range finders reaches a set value, the lifting disc is pushed downwards through the second electric hydraulic device, so that the lifting rod pushes the grabbing hooks outwards through the connecting rods, and the grabbing hooks are opened to precisely position the prefabricated box beam reinforcing mesh.

Description

Technical Field

[0001] The present invention relates to the technical field of positioning devices for steel bar meshes of precast box girders, and specifically, to an intelligent positioning system for steel bar meshes of railway precast box girders. Background Art

[0002] With the expansion of railway construction to high-altitude and high-end environmental regions, the intelligent innovation of high-speed railway beam yards can achieve less manpower in railway construction and serve the needs of major strategic projects. Traditional precast box girder steel bars have the characteristics of large quantity, various types, numerous nodes, and large volume, making it necessary to use the methods of manual lifting and carrying to form the steel bar skeletons of box girders, with high technical difficulty and inconvenient operation. With the continuous progress of technology, currently, lifting tools are mostly used to hoist and transport the steel bar meshes of precast box girders so that they can reach the designated positioning points.

[0003] However, in the actual hoisting and transportation work of the steel bar meshes of precast box girders, there are still certain deficiencies. Currently, during the process of using a lifting tool to grab or position the steel bar mesh of a precast box girder, it is necessary for workers to hold walkie-talkies to communicate and command manually, and multiple people are required to assist and cooperate. The observer observes the real-time position of the lifting tool or the steel bar mesh of the precast box girder and reports it to the operator to move the position of the lifting tool or the steel bar mesh of the precast box girder. The whole process is relatively troublesome and inconvenient, time-consuming and laborious, and it is difficult to quickly and accurately grab and position the steel bar mesh of the precast box girder.

[0004] In view of this, the present invention proposes an intelligent positioning system for steel bar meshes of railway precast box girders. Summary of the Invention

[0005] The present invention proposes an intelligent positioning system for steel bar meshes of railway precast box girders, which solves the problem in the related technology that during the process of using a lifting tool to grab or position the steel bar mesh of a precast box girder, it is necessary for workers to hold walkie-talkies to communicate and command manually, the whole process is relatively troublesome and inconvenient, time-consuming and laborious, and it is difficult to quickly and accurately grab and position the steel bar mesh of the precast box girder.

[0006] The technical solution of the present invention is as follows: An intelligent positioning system for steel bar meshes of railway precast box girders, comprising: two support frames, a truss is fixedly connected to the tops of the two support frames together, a bottom plate is fixedly connected to the bottom ends of the support frames, braking wheels are arranged at the bottom of the bottom plate, a slide rail is fixedly installed at the bottom of the truss, a lifting tool is arranged at the bottom of the slide rail, and an adjusting mechanism for moving the lifting tool along the length direction of the slide rail is arranged on the slide rail;

[0007] The spreader includes a translation seat slidably sleeved inside the slide rail. An installation plate is arranged below the translation seat. A first electro-hydraulic device for lifting and adjusting the installation plate is fixedly installed at the bottom of the translation seat. A displacement plate is arranged below the installation plate. A displacement transmission mechanism is arranged between the installation plate and the displacement plate. Through the displacement transmission mechanism, the displacement plate can be translated on a horizontal plane;

[0008] Grasping mechanisms are arranged at the four corners of the bottom of the displacement plate. A laser rangefinder is arranged on one side of each grasping mechanism. Through the grasping mechanisms and the laser rangefinders, the steel bar mesh of the precast box girder can be grasped and positioned.

[0009] Preferably, the adjusting mechanism includes a lead screw rotatably connected inside the slide rail and a first motor fixedly installed at one end of the slide rail for rotating the lead screw.

[0010] Preferably, the translation seat is slidably sleeved inside the lead screw. A plurality of balls are equidistantly and rotatably sleeved on the inner wall of the upper side of the translation seat. The lead screw threadedly penetrates through the inside of the translation seat.

[0011] Preferably, the displacement transmission mechanism includes two fixed bars fixedly connected to the bottom of the installation plate. Two first lead screws are rotatably connected between the two fixed bars. A linkage assembly is arranged between the two first lead screws;

[0012] One end of the first lead screw rotatably penetrates through the outer wall of one of the fixed bars. The linkage assembly includes two sprockets respectively fixedly connected to the ends of the two first lead screws. A chain is drivingly connected between the two sprockets.

[0013] Preferably, a displacement component is arranged between the two first lead screws. The displacement component includes an L-shaped frame. The first lead screw penetrates through the inside of the L-shaped frame and is threadedly connected thereto. A right-angled block is fixedly connected to one side wall of the L-shaped frame. Limiting grooves are formed on both sides of the L-shaped frame. A moving table is commonly slidably sleeved between the two limiting grooves. The moving table is slidably sleeved on the outer wall of the L-shaped frame. A suspension block is fixedly connected to the bottom of the moving table. The suspension block is fixedly connected to the displacement plate through a bolt.

[0014] Preferably, a linkage mechanism is arranged between the two fixed bars. The linkage mechanism includes a star-shaped shaft rotatably connected between the two fixed bars. A sliding sleeve is slidably sleeved on the outer wall of the star-shaped shaft. A first bevel gear is fixedly sleeved on the outer wall of the sliding sleeve. A second bevel gear is meshingly connected to one side of the first bevel gear. The sliding sleeve is rotatably sleeved inside the right-angled block.

[0015] Preferably, a supporting seat is fixedly connected to the outer wall of the L-shaped frame. A second lead screw is rotatably connected between the supporting seat and the L-shaped frame. The second lead screw threadedly penetrates through the inside of the moving table, and one end of the second lead screw is fixedly connected to the second bevel gear.

[0016] Preferably, a second motor and a third motor are fixedly installed at the bottom of the mounting plate. One end of the output shaft of the third motor is fixedly connected to one of the sprockets, and one end of the output shaft of the second motor is fixedly connected to the star-shaped shaft.

[0017] Preferably, the grasping mechanism includes a second electro-hydraulic actuator fixedly installed at the bottom of the displacement plate and Z-shaped hanging rods symmetrically arranged on both sides of the second electro-hydraulic actuator. The Z-shaped hanging rods are fixedly connected to the bottom of the displacement plate by bolts. A fixing ring is fixedly connected between the two Z-shaped hanging rods. A lifting disc is arranged above the fixing ring. The bottom end of the hydraulic rod of the second electro-hydraulic actuator is fixedly connected to the top end of the lifting disc;

[0018] The bottom of the lifting disc is hinged with lifting rods in an annular array. The lifting rods penetrate through the inside of the fixing ring. A GPS positioning module is fixedly installed at the center of the fixing ring.

[0019] Preferably, a plurality of connecting pieces are fixedly connected to the outer periphery of the bottom of the fixing ring in an annular array. The number of the connecting pieces is the same as that of the lifting rods and they correspond one by one. A hook is hinged to the inner side of each connecting piece. A connecting rod is hinged between the hook and the lifting rod.

[0020] The working principle and beneficial effects of the present invention are as follows:

[0021] 1. In the present invention, a first electro-hydraulic actuator for lifting and adjusting the mounting plate is fixedly installed at the bottom of the translation base. A displacement plate is arranged below the mounting plate. A displacement transmission mechanism is arranged between the mounting plate and the displacement plate. The displacement plate can be translated on the horizontal plane through the displacement transmission mechanism. When grasping the steel bar mesh of the precast box girder, the laser rangefinder located on one side of the grasping mechanism is started. The laser rangefinder emits a laser ray downward. The laser ray irradiates on the surface of the steel bar mesh of the precast box girder to be grasped, forming a light spot on the surface of the steel bar mesh of the precast box girder. At this time, the position of the light spot can be observed to assist the spreader in displacement, so that the spreader can quickly and accurately reach the working location, without the need for manual communication and command with a walkie-talkie, greatly improving the work efficiency and convenience;

[0022] 2. In the present invention, when the spreader reaches the designated position above the precast box girder steel mesh, the first electro-hydraulic device is used to lower the positions of the mounting plate, the displacement transmission mechanism, and the displacement plate. At the same time, the laser rangefinder located on one side of the grasping mechanism can monitor the distance between the laser rangefinder and the surface of the precast box girder steel mesh in real time. During the process of the grasping mechanism moving downward with the displacement plate, the data monitored by the laser rangefinder is sent to the external control device. When the real-time distance monitored by the laser rangefinder reaches the set value, that is, when the grab hook is exactly inserted into the mesh holes of the precast box girder steel mesh, at this time, the second electro-hydraulic device is started, and the lifting plate is lifted by the second electro-hydraulic device. The lifting plate lifts a plurality of lifting rods, and the lifting rods pull the grab hook through the connecting rod, so that the grab hooks move closer inward to grab the precast box girder steel mesh, which does not require the cooperation of multiple people, is simple and convenient to operate, and is practical and efficient.

[0023] 3. In the present invention, when the spreader moves near the landing point of the precast box girder steel mesh, the real-time positions of each grasping mechanism can be grasped by using the GPS positioning module installed on each grasping mechanism, and the real-time positions of the grasping mechanisms can be tracked to ensure that the precast box girder steel mesh can exactly land at the preset location. Specifically, when the precast box girder steel mesh is near the preset landing point, the positions of the displacement plate and the grasping mechanism can be finely adjusted through the displacement transmission mechanism, that is, according to the real-time position of the grasping mechanism fed back. When the precast box girder steel mesh is above the landing point, the first electro-hydraulic device is started to lower the grasping mechanism to lower the precast box girder steel mesh. Similarly, at this time, the laser rangefinder is used to monitor the distance between the laser rangefinder and the landing point in real time. During the process of the grasping mechanism moving downward with the displacement plate, the data monitored by the laser rangefinder is sent to the external control device. When the real-time distance monitored by the laser rangefinder reaches the set value, the second electro-hydraulic device is used to push down the lifting plate, so that the lifting rods push the grab hook through the connecting rod to open the grab hook to accurately land the precast box girder steel mesh. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention will be further described in detail below with reference to the drawings and specific embodiments.

[0025] Figure 1 It is a schematic assembly structure diagram of an intelligent landing system for a precast box girder steel mesh of the present invention;

[0026] Figure 2 It is a schematic assembly diagram of the spreader structure of the present invention;

[0027] Figure 3 It is a schematic diagram of the structure composition of the spreader of the present invention;

[0028] Figure 4 It is a schematic assembly structure diagram of the bottom of the mounting plate of the present invention;

[0029] Figure 5 Schematic diagram of the bottom assembly structure of the displacement plate proposed by the present invention;

[0030] Figure 6 is Figure 5 Enlarged structure schematic diagram at position A in;

[0031] Figure 7 Stereoscopic structure schematic diagram of the grasping mechanism proposed by the present invention;

[0032] In the figure: 1, truss; 2, support frame; 3, bottom plate; 4, brake wheel; 5, lead screw; 6, first motor; 7, slide rail; 8, sling; 81, translation seat; 82, first electro-hydraulic actuator; 83, displacement transmission mechanism; 831, fixed strip; 832, second motor; 833, third motor; 834, first lead screw; 835, linkage assembly; 8351, chain; 8352, sprocket; 836, displacement component; 8361, suspension block; 8362, moving table; 8363, limiting groove; 8364, L-shaped frame; 8365, right-angle block; 8366, supporting seat; 837, linkage mechanism; 8371, star-shaped shaft; 8372, sliding sleeve; 8373, first bevel gear; 8374, second bevel gear; 838, second lead screw; 84, mounting plate; 85, displacement plate; 86, grasping mechanism; 861, Z-shaped hanging rod; 862, second electro-hydraulic actuator; 863, lifting disc; 864, fixed ring; 865, connecting piece; 866, GPS positioning module; 867, grab hook; 868, connecting rod; 869, lifting rod; 87, ball; 88, laser rangefinder. Specific embodiments

[0033] Next, in combination with the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0034] Embodiment 1

[0035] Please refer to Figure 1 , an intelligent positioning system for the steel bar mesh of railway precast box girders, including: two support frames 2, a truss 1 is fixedly connected to the tops of the two support frames 2, a bottom plate 3 is fixedly connected to the bottom ends of the support frames 2, a brake wheel 4 is arranged at the bottom of the bottom plate 3, a slide rail 7 is fixedly installed at the bottom of the truss 1, a sling 8 is arranged at the bottom of the slide rail 7, and an adjusting mechanism for moving the sling 8 along the length direction of the slide rail 7 is arranged on the slide rail 7. Among them, the adjusting mechanism includes a lead screw 5 rotatably connected to the inside of the slide rail 7 and a first motor 6 fixedly installed at one end of the slide rail 7 for rotating the lead screw 5.

[0036] In this embodiment, when working, the power supply is started, and the first motor 6 is started through an external control device. The lead screw 5 is rotated by the first motor 6, so that the working position of the entire spreader 8 can be adjusted. In addition, the position of the truss 1 can be further moved through the brake wheel 4, so as to move the position of the spreader 8.

[0037] Embodiment 2

[0038] Please refer to Figure 1 、 Figure 2 、 Figure 3 and Figure 4 , an intelligent positioning system for the steel bar mesh of precast box girders of railways, including all the contents of Embodiment 1. In addition, the spreader 8 includes a translation seat 81 slidably sleeved inside the slide rail 7. An installation plate 84 is arranged below the translation seat 81. A first electro-hydraulic device 82 for lifting and adjusting the installation plate 84 is fixedly installed at the bottom of the translation seat 81. A displacement plate 85 is arranged below the installation plate 84. A displacement transmission mechanism 83 is arranged between the installation plate 84 and the displacement plate 85. The displacement plate 85 can be translated on the horizontal plane through the displacement transmission mechanism 83. Among them, the translation seat 81 is slidably sleeved inside the lead screw 5. A plurality of balls 87 are equidistantly and rotatably sleeved on the inner wall of the upper side of the translation seat 81. The lead screw 5 threadedly penetrates through the inside of the translation seat 81.

[0039] Specifically, the displacement transmission mechanism 83 includes two fixing strips 831 fixedly connected to the bottom of the installation plate 84. Two first lead screws 834 are rotatably connected between the two fixing strips 831. A linkage assembly 835 is arranged between the two first lead screws 834. One end of the first lead screw 834 rotatably penetrates through the outer wall of one of the fixing strips 831. The linkage assembly 835 includes two chain wheels 8352 respectively fixedly connected to the ends of the two first lead screws 834. A chain 8351 is drivingly connected between the two chain wheels 8352. A displacement member 836 is arranged between the two first lead screws 834. The displacement member 836 includes an L-shaped frame 8364. The first lead screw 834 penetrates through the inside of the L-shaped frame 8364 and is threadedly connected thereto. A right-angle block 8365 is fixedly connected to one side wall of the L-shaped frame 8364. Limiting grooves 8363 are opened on both sides of the L-shaped frame 8364. A moving table 8362 is jointly slidably sleeved between the two limiting grooves 8363. The moving table 8362 is slidably sleeved on the outer wall of the L-shaped frame 8364. A suspension block 8361 is fixedly connected to the bottom of the moving table 8362. The suspension block 8361 is fixedly connected to the displacement plate 85 through a bolt.

[0040] Further, a linkage mechanism 837 is arranged between the two fixing bars 831. The linkage mechanism 837 includes a star-shaped shaft 8371 rotatably connected between the two fixing bars 831. A sliding sleeve 8372 is slidably sleeved on the outer wall of the star-shaped shaft 8371. A first bevel gear 8373 is fixedly sleeved on the outer wall of the sliding sleeve 8372. A second bevel gear 8374 is meshed and connected to one side of the first bevel gear 8373. The sliding sleeve 8372 is rotatably sleeved inside the right-angle block 8365.

[0041] Furthermore, a supporting seat 8366 is fixedly connected to the outer wall of the L-shaped frame 8364. A second lead screw 838 is rotatably connected between the supporting seat 8366 and the L-shaped frame 8364. The second lead screw 838 threadedly penetrates through the inside of the moving platform 8362. One end of the second lead screw 838 is fixedly connected to the second bevel gear 8374. A second motor 832 and a third motor 833 are fixedly installed at the bottom of the mounting plate 84. One end of the output shaft of the third motor 833 is fixedly connected to one of the sprockets 8352. One end of the output shaft of the second motor 832 is fixedly connected to the star-shaped shaft 8371.

[0042] In this embodiment, the position of the displacement plate 85 and the grasping mechanism 86 can be finely adjusted through the displacement transmission mechanism 83. By starting the second motor 832, the second motor 832 drives the star-shaped shaft 8371 to rotate. The star-shaped shaft 8371 drives the first bevel gear 8373 to rotate. The first bevel gear 8373 drives the second lead screw 838 to rotate through the second bevel gear 8374, so that the moving platform 8362 drives the suspension block 8361 to move along the outer wall of the second lead screw 838. By starting the third motor 833, the third motor 833 drives the first lead screw 834 to rotate. Under the action of the linkage assembly 835, the two first lead screws 834 rotate synchronously, thereby driving the L-shaped frame 8364 to move, and further driving the suspension block 8361 to move through the moving platform 8362. Thus, the position of the displacement plate 85 in the horizontal direction can be adjusted.

[0043] Embodiment 3

[0044] Please refer to Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 and Figure 7 , a smart positioning system for the steel bar mesh of railway precast box girders, including all the contents of Embodiment 2. In addition, grasping mechanisms 86 are arranged at the four corners of the bottom of the displacement plate 85. A laser rangefinder 88 is arranged on one side of each grasping mechanism 86. The precast box girder steel bar mesh can be grasped and positioned through the grasping mechanisms 86 and the laser rangefinders 88.

[0045] Specifically, the grasping mechanism 86 includes a second electro-hydraulic actuator 862 fixedly installed at the bottom of the displacement plate 85 and Z-shaped suspension rods 861 symmetrically arranged on both sides of the second electro-hydraulic actuator 862. The Z-shaped suspension rods 861 are fixedly connected to the bottom of the displacement plate 85 by bolts. A fixing ring 864 is fixedly connected between the two Z-shaped suspension rods 861. An elevating disc 863 is arranged above the fixing ring 864. The bottom end of the hydraulic rod of the second electro-hydraulic actuator 862 is fixedly connected to the top end of the elevating disc 863.

[0046] Furthermore, the bottom of the elevating disc 863 is articulated with elevating rods 869 in an annular array. The elevating rods 869 penetrate inside the fixing ring 864. A GPS positioning module 866 is fixedly installed at the center of the fixing ring 864.

[0047] Even further, a plurality of connectors 865 are fixedly connected to the outer periphery of the bottom of the fixing ring 864 in an annular array. The number of the connectors 865 is the same as that of the elevating rods 869 and they correspond one by one. A grab hook 867 is articulated on the inner side of each connector 865. A connecting rod 868 is articulated between the grab hook 867 and the elevating rod 869.

[0048] In this embodiment, when the spreader 8 reaches the designated position above the precast box girder steel mesh, the first electro-hydraulic actuator 82 is used to lower the positions of the mounting plate 84, the displacement transmission mechanism 83 and the displacement plate 85. At the same time, a laser rangefinder 88 on one side of the grasping mechanism 86 can monitor the distance between the laser rangefinder 88 and the surface of the precast box girder steel mesh in real time. During the process of the grasping mechanism 86 moving down with the displacement plate 85, the data monitored by the laser rangefinder 88 is sent to an external control device. When the real-time distance monitored by the laser rangefinder 88 reaches the set value, that is, when the grab hook 867 just inserts into the mesh holes of the precast box girder steel mesh, at this time, the second electro-hydraulic actuator 862 is started, and the elevating disc 863 is lifted by the second electro-hydraulic actuator 862. The elevating disc 863 lifts the plurality of elevating rods 869. The elevating rods 869 pull the grab hook 867 through the connecting rod 868, so that the grab hook 867 moves inward to grasp the precast box girder steel mesh.

[0049] In this embodiment, when the precast box girder steel mesh is above the landing point, the first electro-hydraulic actuator 82 is started to lower the grasping mechanism 86 to lower the precast box girder steel mesh. Similarly, at this time, the laser rangefinder 88 is used to monitor the distance between the laser rangefinder 88 and the landing point in real time. During the process of the grasping mechanism 86 moving down with the displacement plate 85, the data monitored by the laser rangefinder 88 is sent to an external control device. When the real-time distance monitored by the laser rangefinder 88 reaches the set value, the elevating disc 863 is pushed down by the second electro-hydraulic actuator 862, so that the elevating rods 869 push the grab hook 867 through the connecting rod 868 to open the grab hook 867 for accurate landing of the precast box girder steel mesh.

[0050] Working principle and usage process: When working, start the power supply, start the first motor 6 through an external control device, rotate the lead screw 5 through the first motor 6, so as to adjust the working position of the entire spreader 8.

[0051] When the spreader 8 grabs the precast box girder steel mesh, start the first electro-hydraulic device 82, adjust the working height of the mounting plate 84 through the first electro-hydraulic device 82, and under the action of the displacement transmission mechanism 83, the mounting plate 84 can drive the displacement plate 85 to move up and down.

[0052] When grabbing the precast box girder steel mesh, start the laser rangefinder 88 located on one side of the grabbing mechanism 86. The laser rangefinder 88 emits a laser ray downward, and the laser ray irradiates on the surface of the precast box girder steel mesh to be grabbed, forming a light spot on the surface of the precast box girder steel mesh. At this time, by observing the position of the light spot, the spreader 8 can be assisted to displace, so that the spreader 8 can quickly and accurately reach the working location, without the need for manual communication and command with a walkie-talkie, greatly improving work efficiency and convenience.

[0053] When the spreader 8 reaches the designated position above the precast box girder steel mesh, lower the positions of the mounting plate 84, the displacement transmission mechanism 83 and the displacement plate 85 through the first electro-hydraulic device 82. At the same time, the laser rangefinder 88 located on one side of the grabbing mechanism 86 can monitor the distance between the laser rangefinder 88 and the surface of the precast box girder steel mesh in real time. During the process of the grabbing mechanism 86 moving down with the displacement plate 85, the data monitored by the laser rangefinder 88 is sent to the external control device. When the real-time distance monitored by the laser rangefinder 88 reaches the set value, that is, the grab hook 867 is exactly inserted into the mesh hole of the precast box girder steel mesh. At this time, start the second electro-hydraulic device 862, lift the lifting disc 863 through the second electro-hydraulic device 862, lift the plurality of lifting rods 869 by the lifting disc 863, and the lifting rods 869 pull the grab hook 867 through the connecting rod 868, so that the grab hook 867 moves inward to grab the precast box girder steel mesh.

[0054] After the steel bar mesh of the precast box girder is grabbed by moving the grab hooks 867 inward, the first electro-hydraulic actuator 82 is used to move the mounting plate 84, the displacement transmission mechanism 83, and the displacement plate 85 upward. By starting the first motor 6 to rotate the lead screw 5, the spreader 8 can be moved along the length direction of the slide rail 7. The position of the truss 1 can be further adjusted by the brake wheel 4, so as to move the spreader 8. It should be noted that the frame composed of the support frame 2, the truss 1, the slide rail 7, etc. is used to suspend the spreader 8 in the present invention. In the actual use process, the spreader 8 can also be suspended and its position adjusted by a crane and a steel wire rope, which is a mature existing technology and will not be elaborated here.

[0055] In addition, a base station is installed near the landing point of the steel bar mesh of the precast box girder. When the spreader 8 moves near the landing point of the steel bar mesh of the precast box girder, the real-time position of each grab mechanism 86 can be grasped by using the GPS positioning module 866 installed on each grab mechanism 86, and the real-time position of the grab mechanism 86 can be tracked to ensure that the steel bar mesh of the precast box girder can be accurately landed at the preset location. Specifically, when the steel bar mesh of the precast box girder is near the preset landing point, the positions of the displacement plate 85 and the grab mechanism 86 can be finely adjusted through the displacement transmission mechanism 83, that is, according to the real-time position of the grab mechanism 86 fed back, by starting the second motor 832, the second motor 832 drives the star-shaped shaft 8371 to rotate, the star-shaped shaft 8371 drives the first bevel gear 8373 to rotate, the first bevel gear 8373 drives the second lead screw 838 to rotate through the second bevel gear 8374, so that the moving platform 8362 drives the suspension block 8361 to move along the outer wall of the second lead screw 838. By starting the third motor 833, the third motor 833 drives the first lead screw 834 to rotate. Under the action of the linkage assembly 835, the two first lead screws 834 rotate synchronously, so as to drive the L-shaped frame 8364 to move, and then the suspension block 8361 can be driven to move by the moving platform 8362. Thus, the position adjustment of the displacement plate 85 in the horizontal direction is realized.

[0056] When the steel bar mesh of the precast box girder is above the landing point, the first electro-hydraulic actuator 82 is started to move the grab mechanism 86 downward to lower the steel bar mesh of the precast box girder. Similarly, at this time, the laser rangefinder 88 is used to monitor the distance between the laser rangefinder 88 and the landing point in real time. During the downward movement of the grab mechanism 86 along with the displacement plate 85, the data monitored by the laser rangefinder 88 is sent to the external control device. When the real-time distance monitored by the laser rangefinder 88 reaches the set value, the second electro-hydraulic actuator 862 is used to push the lifting disc 863 downward, so that the lifting rod 869 pushes the grab hook 867 outward through the connecting rod 868, and the grab hook 867 is opened to accurately land the steel bar mesh of the precast box girder.

[0057] It should be noted that the circuits, electronic components, and modules involved in the present invention are all prior arts, which can be fully implemented by those skilled in the art without further elaboration. The content protected by the present invention does not involve improvements to software and methods either.

[0058] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. An intelligent placement system for the steel bar mesh of precast box girders for railways, comprising: Two support frames (2), the top ends of the two support frames (2) are fixedly connected to a truss (1), the bottom ends of the support frames (2) are fixedly connected to a bottom plate (3), a brake wheel (4) is arranged at the bottom of the bottom plate (3), and the characterised in that a slide rail (7) is fixedly mounted at the bottom of the truss (1), a sling (8) is arranged at the bottom of the slide rail (7), and an adjustment mechanism for moving the sling (8) along the length direction of the slide rail (7) is arranged on the slide rail (7); The lifting device (8) comprises a translation seat (81) which can be slidably sleeved inside the slide rail (7), a mounting plate (84) is arranged below the translation seat (81), a first electric hydraulic device (82) for adjusting the lifting and lowering of the mounting plate (84) is fixedly installed at the bottom of the translation seat (81), a displacement plate (85) is arranged below the mounting plate (84), a displacement transmission mechanism (83) is arranged between the mounting plate (84) and the displacement plate (85), and the displacement transmission mechanism (83) can translate the displacement plate (85) on a horizontal plane; The bottom of the displacement plate (85) is provided with a grabbing mechanism (86) near the four corners, and a laser rangefinder (88) is provided on one side of each grabbing mechanism (86). The grabbing mechanism (86) and the laser rangefinder (88) can be used to grab and place the prefabricated box girder steel mesh.

2. The intelligent positioning system for the steel bar mesh of precast box girders for railways according to claim 1, wherein The adjustment mechanism comprises a lead screw (5) rotatably connected to the inside of the slide rail (7) and a first motor (6) fixedly mounted on one end of the slide rail (7) for rotating the lead screw (5).

3. The intelligent positioning system for the steel bar mesh of precast box girders for railways according to claim 2, wherein, The translation seat (81) is slidably sleeved inside the lead screw (5); a plurality of balls (87) are equidistantly and rotatably sleeved on the upper inner wall of the translation seat (81); and the lead screw (5) is threadedly penetrated inside the translation seat (81).

4. The intelligent positioning system for the steel bar mesh of railway precast box girders according to claim 3, characterized in that The displacement transmission mechanism (83) comprises two fixing bars (831) fixedly connected to the bottom of the mounting plate (84), two first screw rods (834) are rotatably connected between the two fixing bars (831), and a linkage assembly (835) is arranged between the two first screw rods (834); One end of the first screw rod (834) rotates and passes through the outer wall of one of the fixed bars (831), and the linkage assembly (835) includes two sprockets (8352) respectively fixed to the ends of the two first screw rods (834), and a chain (8351) is connected between the two sprockets (8352) for transmission.

5. The intelligent positioning system for the steel bar mesh of precast box girders for railways according to claim 4, characterized in that, A displacement member (836) is provided between the two first lead screws (834). The displacement member (836) includes an L-shaped frame (8364). The first lead screw (834) passes through the inside of the L-shaped frame (8364) and is threadedly connected thereto. One end side wall of the L-shaped frame (8364) is fixedly connected with a right-angle block (8365). Limiting grooves (8363) are formed on both sides of the L-shaped frame (8364). A moving table (8362) is slidably sleeved between the two limiting grooves (8363). The moving table (8362) is slidably sleeved on the outer wall of the L-shaped frame (8364). A suspension block (8361) is fixedly connected to the bottom of the moving table (8362). The suspension block (8361) is fixedly connected to the displacement plate (85) by bolts.

6. The intelligent positioning system for the steel bar mesh of the precast box girder of the railway according to claim 5, characterized in that, A linkage mechanism (837) is provided between the two fixing bars (831). The linkage mechanism (837) includes a star-shaped shaft (8371) rotatably connected between the two fixing bars (831). A sliding sleeve (8372) is slidably sleeved on the outer wall of the star-shaped shaft (8371). A first bevel gear (8373) is fixedly sleeved on the outer wall of the sliding sleeve (8372). A second bevel gear (8374) is meshed and connected to one side of the first bevel gear (8373). The sliding sleeve (8372) is rotatably sleeved inside the right-angle block (8365).

7. The intelligent positioning system for the steel bar mesh of precast box girders for railways according to claim 6, wherein, A supporting seat (8366) is fixedly connected to the outer wall of the L-shaped frame (8364). A second lead screw (838) is rotatably connected between the supporting seat (8366) and the L-shaped frame (8364). The second lead screw (838) threadedly penetrates through the inside of the moving table (8362). One end of the second lead screw (838) is fixedly connected to the second bevel gear (8374).

8. An intelligent positioning system for the steel bar mesh of precast box girders for railways according to claim 7, characterized in that, A second motor (832) and a third motor (833) are fixedly installed at the bottom of the mounting plate (84). One end of the output shaft of the third motor (833) is fixedly connected to one of the sprockets (8352). One end of the output shaft of the second motor (832) is fixedly connected to the star-shaped shaft (8371).

9. The intelligent positioning system for the steel bar mesh of precast box girders for railways according to claim 8, wherein, The grasping mechanism (86) includes a second electro-hydraulic actuator (862) fixedly installed at the bottom of the displacement plate (85) and Z-shaped suspension rods (861) symmetrically arranged on both sides of the second electro-hydraulic actuator (862). The Z-shaped suspension rods (861) are fixedly connected to the bottom of the displacement plate (85) by bolts. A fixing ring (864) is fixedly connected between the two Z-shaped suspension rods (861). A lifting disc (863) is arranged above the fixing ring (864). The bottom end of the hydraulic rod of the second electro-hydraulic actuator (862) is fixedly connected to the top end of the lifting disc (863); The bottom of the lifting disc (863) is annularly and arrayedly hinged with lifting rods (869). The lifting rods (869) penetrate through the inside of the fixing ring (864). A GPS positioning module (866) is fixedly installed at the center of the fixing ring (864).

10. The intelligent positioning system for the steel bar mesh of precast box girders for railways according to claim 9, characterized in that, A plurality of connecting members (865) are fixedly connected in an annular array on the outer periphery of the bottom of the fixing ring (864). The number of the connecting members (865) is the same as and corresponds one by one to that of the lifting rods (869). A hook (867) is hinged to the inner side of each connecting member (865), and a connecting rod (868) is hingedly connected between the hook (867) and the lifting rod (869).

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