Cable crane for wide-deck spatial main cable suspension bridge and control method

Abstract

The invention discloses a cable crane for a wide-bridge-floor space main cable suspension bridge and a control method, belongs to the technical field of cable cranes, and solves the technical problem that an existing cable crane cannot meet the hoisting requirement of a wide bridge girder. The cable crane comprises a hoisting truss, a controller and a horizontal detector; the horizontal detector is installed on the hoisting truss, sliding brackets and variable-amplitude driving mechanisms for driving the sliding brackets to reciprocate along the two ends of the hoisting truss are slidably arranged at the bottoms of the two ends of the hoisting truss correspondingly, the bottoms of the sliding brackets are rotationally connected with a walking rack used for walking along a main cable, and horizontal adjusting mechanisms are arranged at the two ends of the sliding brackets correspondingly. A main cable distance measuring device is arranged between the two walking racks, and the controller is electrically connected with the horizontal detector, the main cable distance measuring device, the variable amplitude driving mechanism, the walking racks and the horizontal adjusting mechanism. The variable-amplitude driving mechanism can be controlled to keep the distance between the walking racks consistent with the distance between the main cables, and the horizontal adjusting mechanism is controlled to keep the hoisting truss in a horizontal posture all the time.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cable crane, more particularly, it relates to a cable crane for wide bridge space main cable suspension bridge and a control method. BACKGROUND

[0002] The wide bridge space main cable suspension bridge is different from the conventional flat main cable suspension bridge in the shape of the main cable. The two main cables are arranged in a horizontal spindle shape between the two towers. Since the main cable and the sling form a three-dimensional structure, the lateral bearing capacity of the cable system is significantly improved without affecting the vertical bearing capacity, thereby greatly improving the lateral stiffness and torsional stiffness of the entire bridge, and solving the problem of reduced lateral stiffness of the bridge due to the increase of the bridge span and the decrease of the width-span ratio, which further affects the dynamic stability of the bridge. The wide bridge space cable plane suspension bridge is the latest achievement in the research of kilometer and above level long-span bridges in recent years, and represents the development direction of future super-kilometer level railway bridges.

[0003] As the main construction equipment of the suspension bridge, the cable crane has been widely used in the installation of suspension bridges in China. However, the cable crane is mainly adapted to parallel main cable suspension bridges. The patent publication "CN103790114A" discloses a cable crane combined with hydraulic traction and roller walking and a walking method thereof. Since the walking mechanism has a fixed distance, it cannot adapt to the variable span condition of the space main cable, and also has the following problems: 1. The fixed cable clamp of the walking traction needs the assistance of the bridge crane to adjust the position, which cannot form continuous walking, and the operation efficiency of the crane is low; 2. The structure stability of the wheel type walking on the main cable is poor, and there is a risk of wheel deviation and slipping.

[0004] There is no example of variable span cable crane in China, and the existing technologies mainly include: The patent publication "CN106522097A" discloses a self-adaptive cable crane for super-large space cable plane suspension bridge construction, which adopts two single machines installed on the main cable and used in combination. There is no connection between the two machines, which can well adapt to the structure of the space main cable, but the single machine wheel type walking has a risk of overturning and poor reliability in the way of maintaining balance with counterweight. When two single machines are used in combination, the synchronization reliability is poor.

[0005] The patent publication "CN112551360A" discloses a variable span cable crane, and the patent publication "CN117142357A" discloses a variable distance cable crane equipment. The structures of the two patents have a certain variable amplitude capability and can operate on the plane main cable in part, but due to the structural limitation, they cannot realize variable amplitude from the tower end to the main cable span, so the application of the patent technology has limitations.

[0006] Meanwhile, the existing cable crane is designed for narrow bridge deck suspension bridges, and the bridge deck width of the suspension bridges is basically less than 40 meters, the sling point of the sling cable of the hoisted beam section is basically below the main cable, and thus the lifting point of the crane is arranged below or on the inner side of the main cable. The width of the bridge deck of a wide bridge deck suspension bridge is greater than twice the distance between the main cables, the sling point of the sling cable of the hoisted beam section is outside the lower side of the main cable, and the arrangement of the lifting point of the original cable crane causes the length of the beam section outside the lifting point to be too long and the weight to be too heavy, thereby causing the beam section to be bent and deformed during hoisting. Therefore, the existing cable crane and the patented technology cannot meet the needs of the hoisting of the main beam of a wide bridge. SUMMARY

[0007] The technical problem to be solved by the present application is the above-mentioned deficiencies of the prior art. The first object of the present application is to provide a cable crane for a wide bridge deck space main cable suspension bridge.

[0008] The second object of the present application is to provide a control method of the cable crane for the wide bridge deck space main cable suspension bridge.

[0009] In order to achieve the first object, the present application provides a cable crane for a wide bridge deck space main cable suspension bridge, which comprises a hoisting truss, a controller and a level detector. The level detector is installed on the hoisting truss. The bottom of the two ends of the hoisting truss is respectively provided with a sliding bracket and a variable amplitude driving mechanism for driving the sliding bracket to reciprocate along the two ends of the hoisting truss. The bottom of the sliding bracket is rotatably connected with a walking frame for walking along the main cable. The two ends of the sliding bracket are respectively provided with a horizontal adjustment mechanism. A main cable distance measuring device is arranged between the two walking frames. The controller is electrically connected with the level detector, the main cable distance measuring device, the variable amplitude driving mechanism, the walking frame and the horizontal adjustment mechanism.

[0010] As a further improvement, the top of the sliding bracket is slidably connected with the bottom of the hoisting truss. The two sides of the top of the sliding bracket are respectively provided with a baffle. The hoisting truss is located between the two baffles. The top of the sliding bracket is further provided with a first connecting plate. One end of the variable amplitude driving mechanism is rotatably connected with the first connecting plate.

[0011] Further, the side wall of the hoisting truss is provided with a first guide rail. The upper and lower sides of the hoisting truss are respectively provided with a linear array of fixing holes. The other end of the variable amplitude driving mechanism is provided with a counterforce sliding seat slidably connected with the first guide rail. The baffle and the counterforce sliding seat are respectively provided with a fixing pin matched with the fixing hole.

[0012] Further, the variable amplitude driving mechanism is a jack or an electric push rod.

[0013] Further, the horizontal adjusting mechanism comprises posture locking electric push rods and posture adjusting jacks, which are respectively arranged on the two sides of the sliding bracket, and the upper and lower ends of the posture locking electric push rods and the posture adjusting jacks are respectively rotatably connected to the sliding bracket and the walking frame.

[0014] Further, the main cable distance measuring device comprises two distance measuring components in contact with the corresponding main cables, and each distance measuring component comprises a roller and an elastic telescopic rod for pressing the roller against the main cable, one end of the elastic telescopic rod being connected to the walking frame, a first laser distance meter being arranged on the mounting frame of one roller, and a laser signal reflecting plate corresponding to the first laser distance meter being arranged on the mounting frame of the other roller; the mounting frame of the roller is further provided with a wedge-shaped plate, and wedge-shaped surfaces are arranged on the two sides of the wedge-shaped plate.

[0015] Further, the main cable distance measuring device further comprises a second laser distance meter, which is arranged on one of the sliding brackets and is aligned with the side surface of the other sliding bracket.

[0016] Further, the walking frame comprises a support trolley structure, a sliding frame structure slidingly arranged in the support trolley structure, and a sliding driving mechanism for driving the sliding frame structure to reciprocate in the support trolley structure, and the sliding frame structure is sleeved on the periphery of the main cable. The support trolley structure comprises two trolley frames and a trolley beam connecting the two trolley frames, the bottom of the sliding bracket is rotatably connected to the trolley beam, the top of the trolley frame is provided with a jacking jack, the inner top of the trolley frame is provided with a support clamping foot, the piston rod of the jacking jack penetrates through the trolley frame and is connected to the support clamping foot, and the two sides of the trolley frame are respectively provided with a first fixed clamping foot and a first clamping driving mechanism for driving the first fixed clamping foot to clamp the main cable.

[0017] Further, the sliding frame structure comprises two clamping frames, and the peripheries of the two clamping frames are connected by a plurality of connecting rods, the connecting rods being slidingly connected to the trolley frame, and the inner top and the two sides of the clamping frame are respectively provided with a second fixed clamping foot and a second clamping driving mechanism for driving the second fixed clamping foot to clamp the main cable.

[0018] In order to achieve the above-mentioned purpose two, the application provides a control method of the cable crane for the wide-bridge-space main cable suspension bridge, which further comprises, The controller monitors the distance between the two main cables in real time through the main cable distance measuring device, and controls the variable amplitude driving mechanism to drive the sliding bracket to move according to the distance between the two main cables, so as to change the distance between the two walking frames in real time to adapt to the change of the distance between the two main cables. The controller monitors horizontal data of the hoisting truss in real time through the horizontal detector, and controls the horizontal adjusting mechanism to act according to the horizontal data, so that the hoisting truss always keeps a horizontal posture.

[0019] Advantages Compared with the prior art, the present application has the advantages that: 1. The present application can realize full-cable-range amplitude walking from the tower end to the main cable span by installing the full-length guide rail on the outer side of the hoisting truss, and adjusting the spacing of the walking frame by the walking jack.

[0020] 2. The present application can avoid the device walking jam caused by the self-walking frame deviation by setting the main cable distance measuring device, detecting the spacing of the main cable, and controlling the spacing of the self-walking frame (device fulcrum) by the controller to keep consistent with the spacing of the main cable, thereby ensuring smooth device walking.

[0021] 3. The present application can ensure the stability of the hoisting truss by setting the horizontal detector on the hoisting truss to detect the horizontal posture of the hoisting truss, and automatically adjusting the horizontal posture of the truss in real time by the controller controlling the posture adjusting jack.

[0022] 4. The present application can make the hoisting truss more safe, stable and reliable by designing the posture locking electric push rod of the truss horizontal adjusting mechanical lock, and making the mechanical lock truss horizontal posture by the controller controlling the screw pair in the posture locking electric push rod and the horizontal posture adjusting jack.

[0023] 5. The walking frame of the present application is in a combined state with the main cable, and the main cable passes through the middle of the frame, which can greatly reduce the overall gravity center of the device, greatly enhance the overall stability of the device, and eliminate the risk of device overturning.

[0024] 6. The present application can drive the device to move forward or backward by the sliding drive mechanism between the support trolley structure and the sliding frame structure without the assistance of other devices, and the walking frame always has two points in a clamping state in the upper, left and right directions of the main cable, which is stable and has no risk of slipping.

[0025] 7. The main cable and the cable clamp pass through the middle of the frame, and the movable stop rod is designed on the support trolley structure and the sliding frame structure to ensure the stress of the frame when clamping the main cable, and also does not hinder the frame passing through the cable clamp. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of the hoisting beam segment of the present application; Figure 2Structure diagram of the sliding bracket in the application; Figure 3 Structure diagram of the main cable ranging device in the application; Figure 4 Structure diagram of the main cable ranging device crossing the cable clamp in the application; Figure 5 Structure diagram of the horizontal adjusting mechanism in the application; Figure 6 Structure diagram of the attitude locking electric push rod in the application; Figure 7 Structure diagram of the walking frame in the application; Figure 8 Structure diagram of the supporting trolley structure in the application; Figure 9 Structure diagram of the Figure 8 Enlarged view of A in the application; Figure 10 Structure diagram of the sliding frame structure in the application; Figure 11 Structure diagram of the trolley frame in the application; Figure 12 Structure diagram of the first fixed holding foot and the first holding driving mechanism in the application.

[0027] Wherein: 1-lifting truss, 2-sliding bracket, 3-amplitude drive mechanism, 4-main cable, 5-traveling frame, 6-horizontal adjustment mechanism, 7-main cable ranging device, 8-baffle, 9-first connecting plate, 10-first guide rail, 11-fixing hole, 12-counterforce sliding seat, 13-fixing bolt, 14-posture locking electric push rod, 15-posture adjustment jack, 16-roller, 17-elastic telescopic rod, 18-first laser range finder, 19-laser signal reflector, 20-wedge plate, 21-wedge surface, 22-second laser range finder, 23-support trolley structure, 24-sliding frame structure, 25-sliding drive mechanism, 26-trolley frame, 27-trolley beam, 28-jacking jack, 29-supporting foot, 30-first fixed foot, 31-first holding drive mechanism, 32-holding frame, 33-connecting rod, 34-second fixed foot, 35-second holding drive mechanism, 36-hydraulic system, 37-automatic take-up device, 38-lifting jack, 39-lifting steel cable, 40-sling, 41-beam segment, 42-first sliding plate, 43-second connecting plate, 44-cable clamp, 45-telescopic screw, 46-gear nut, 47-nut limiting block, 48-sleeve, 49-first motor, 50-driving gear, 51-second sliding plate, 52-second motor, 53-coupling, 54-support bearing and bearing seat, 55-screw rod, 56-screw rod nut, 57-movable blocking rod, 58-return spring, 59-first limiting block, 60-compression spring, 61-motor mounting seat, 62-sliding sleeve, 63-sliding seat, 64-second guide rail, 65-supporting sliding block, 66-second limiting block, 67-connecting rod, 68-connecting rod joint, 69-stand. DETAILED DESCRIPTION

[0028] The application will be further described below in connection with the specific embodiments in the drawings.

[0029] Reference Figures 1-12 A cable crane for wide bridge space main cable suspension bridge, comprising a lifting truss 1, further comprising a controller and a horizontal detector; the horizontal detector is installed on the lifting truss 1, the bottom of the two ends of the lifting truss 1 is respectively provided with a sliding bracket 2, and an amplitude drive mechanism 3 is arranged to drive the sliding bracket 2 to reciprocate along the two ends of the lifting truss 1, the bottom of the sliding bracket 2 is rotatably connected with a traveling frame 5 for traveling along the main cable 4, the two ends of the sliding bracket 2 are respectively provided with a horizontal adjustment mechanism 6, and a main cable ranging device 7 is arranged between the two traveling frames 5, and the controller is electrically connected with the horizontal detector, the main cable ranging device 7, the amplitude drive mechanism 3, the traveling frame 5 and the horizontal adjustment mechanism 6. The controller is a PLC or a single-chip microcomputer or an industrial computer.

[0030] Specifically, as Figure 1As shown, the hoisting truss 1 is provided with a hydraulic system 36, the length of the hoisting truss 1 is greater than the interval of the two main cables 4, the two ends of the hoisting truss 1 are respectively provided with automatic take-up devices 37, the lower part of the automatic take-up device 37 is provided with a lifting jack 38, the lifting steel wire 39 of the automatic take-up device 37 passes through the lifting jack 38 and is connected with a lifting appliance 40, the lifting position of the beam segment 41 connected by the two lifting appliances 40, the beam segment 41 is synchronously lifted by the two lifting jacks 38. That is, the lifting point of the hoisting truss 1 is arranged outside the two main cables 4, which can meet the hoisting requirements of the main girder of the wide bridge deck suspension bridge.

[0031] As shown in the drawings, Figure 2 The top of the sliding bracket 2 is slidably connected with the bottom of the hoisting truss 1, the two sides of the top of the sliding bracket 2 are respectively provided with baffle plates 8 to form a groove structure, the hoisting truss 1 is located between the two baffle plates 8, that is, located in the groove structure, and the top of the sliding bracket 2 is further provided with a first connecting plate 9, one end of the amplitude-changing drive mechanism 3 is rotatably connected with the first connecting plate 9. The top of the sliding bracket 2 and the bottom of the hoisting truss 1 are provided with a first sliding plate 42, which can reduce the friction between the sliding bracket 2 and the hoisting truss 1 and ensure smooth movement of the sliding bracket 2. Preferably, the first sliding plate 42 is made of MGE material. The bottom of the sliding bracket 2 is provided with a second connecting plate 43, the second connecting plate 43 has a triangular structure, and the lower end of the second connecting plate 43 is rotatably connected with the traveling frame 5 through a pin shaft.

[0032] Further, the side wall of the hoisting truss 1 is provided with a first guide rail 10, in order to improve the working stability, the first guide rail 10 can be arranged on the side wall of the two sides of the hoisting truss 1, the upper and lower sides of the hoisting truss 1 are respectively provided with a linear array of fixed holes 11, the other end of the amplitude-changing drive mechanism 3 is provided with a counterforce sliding seat 12 which is slidably connected with the first guide rail 10, the amplitude-changing drive mechanism 3 is rotatably connected with the counterforce sliding seat 12, and the baffle plate 8 and the counterforce sliding seat 12 are respectively provided with a fixed pin 13 which is matched with the fixed hole 11. The fixed pin 13 can be a spring pin, or can be driven to be inserted into or pulled out of the fixed hole 11 by an oil cylinder or an air cylinder or an electric push rod.

[0033] In the embodiment, the amplitude-changing drive mechanism 3 is a jack or an electric push rod.

[0034] The amplitude changing process: when the fixed pin 13 on the counterforce slide base 12 is extended and inserted into the fixed hole 11 to be fixed with the first guide rail 10, the fixed pin 13 on the slide bracket 2 is retracted and pulled out of the fixed hole 11, then the distance between the two slide brackets 2 is changed by the action of the amplitude changing drive mechanism 3 to adapt to the change of the distance between the main cables 4; when the amplitude changing drive mechanism 3 is extended to the position, the fixed pin 13 on the slide bracket 2 is extended and inserted into the fixed hole 11 to be fixed with the first guide rail 10, the fixed pin 13 on the counterforce slide base 12 is retracted and pulled out of the fixed hole 11, then the counterforce slide base 12 is dragged to the fixed position of the next amplitude change by the retraction of the amplitude changing drive mechanism 3. The distance between the walking frames 5 is adjusted by the step-by-step amplitude changing drive mechanism 3 (jack or electric push rod step), which can realize full-cable-range amplitude changing walking from the tower end to the main cable span.

[0035] As shown in Figure 5 , the horizontal adjustment mechanism 6 includes an attitude locking electric push rod 14 and an attitude adjusting jack 15, the attitude locking electric push rod 14 and the attitude adjusting jack 15 are respectively located on both sides of the slide bracket 2, and the upper and lower ends of the attitude locking electric push rod 14 and the attitude adjusting jack 15 are respectively rotationally connected with the slide bracket 2 and the walking frame 5. The attitude locking electric push rod 14 has a self-locking function.

[0036] In an embodiment, the attitude locking electric push rod 14 can be selected from existing mature electric push rods with self-locking function.

[0037] In an embodiment, as shown in Figure 6 , the attitude locking electric push rod 14 includes a telescopic screw rod 45, a gear nut 46, a nut limiting block 47, a sleeve 48, a first motor 49, and a drive gear 50. The telescopic screw rod 45 is slidingly installed in the sleeve 48, and one end of the telescopic screw rod 45 and one end of the sleeve 48 are both provided with a hinged hole for rotationally connecting the slide bracket 2 and the walking frame 5. The other end of the sleeve 48 is fixedly connected with the nut limiting block 47, the gear nut 46 is rotationally installed in the nut limiting block 47, the telescopic screw rod 45 is connected with the gear nut 46 through self-locking threads, the outer wall of the gear nut 46 is provided with a gear tooth, the first motor 49 is installed on the sleeve 48 or the nut limiting block 47, and the drive gear 50 is installed on the rotating shaft of the first motor 49, and the drive gear 50 is meshingly connected with the gear nut 46. The first motor 49 drives the gear nut 46 to rotate through the drive gear 50, so as to realize the extension or shortening of the attitude locking electric push rod 14. The first motor 49 is a step motor or a servo motor.

[0038] The attitude adjusting process: through the real-time monitoring data of the horizontal detector, the extension and retraction of the attitude adjusting jack 15 is controlled to control the level of the slide bracket 2, and the attitude locking electric push rod 14 is controlled to lock the horizontal attitude to prevent the steel truss from overturning due to excessive external disturbance, so as to keep the operation surface of the hoisting truss 1 horizontal.

[0039] As Figure 3 shown, the main cable distance measuring device 7 includes two distance measuring assemblies respectively in contact with the corresponding main cable 4, the distance measuring assembly including a roller 16, an elastic telescopic rod 17 pressing the roller 16 against the main cable 4, one end of the elastic telescopic rod 17 being connected to the walking frame 5, a first laser distance meter 18 being arranged on the mounting frame of one of the rollers 16, and a laser signal reflecting plate 19 corresponding to the first laser distance meter 18 being arranged on the mounting frame of the other roller 16, the distance monitoring data of the main cable 4 being obtained in real time through the first laser distance meter 18 and the laser signal reflecting plate 19. Under the action of the compression spring 60 in the elastic telescopic rod 17, it can be ensured that the roller 16 is always in contact with the main cable 4. The surface of the roller 16 is provided with a concave arc surface, the radius of the arc surface being consistent with the radius of the main cable 4, which can ensure the stability of the movement of the roller 16 on the main cable 4, thereby ensuring the measurement accuracy and stability of the first laser distance meter 18.

[0040] As Figure 4 shown, the mounting frame of the roller 16 is further provided with a wedge-shaped plate 20, the two sides of the wedge-shaped plate 20 (i.e. the forward and backward directions of the walking frame 5) being provided with wedge-shaped surfaces 21. When the walking frame 5 walks to the cable clamp 44 of the main cable 4, the wedge-shaped surfaces 21 come into contact with the cable clamp 44, the walking frame 5 continues to walk, under the action of the wedge-shaped surfaces 21, the elastic telescopic rod 17 is compressed, after the walking frame 5 passes the cable clamp 44, the elastic telescopic rod 17 automatically extends to press the roller 16 against the surface of the main cable 4, realizing the automatic avoidance of the cable clamp 44 by the main cable distance measuring device 7.

[0041] Further, the main cable distance measuring device 7 further includes a second laser distance meter 22, the second laser distance meter 22 being installed in one of the sliding carriages 2 and being aligned with the side surface of the other sliding carriage 2, the distance monitoring data of the sliding carriage 2 being obtained in real time through the second laser distance meter 22.

[0042] As Figure 7 shown, the walking frame 5 includes a support trolley structure 23, a sliding frame structure 24 slidingly installed in the support trolley structure 23, and a sliding driving mechanism 25 driving the sliding frame structure 24 to reciprocate in the support trolley structure 23, the sliding frame structure 24 being sleeved on the periphery of the main cable 4.

[0043] Specifically, as Figure 8As shown, the support trolley structure 23 comprises two trolley frames 26, a trolley beam 27 connecting the two trolley frames 26, the trolley beam 27 being located at the top of the two trolley frames 26. The bottom of the sliding bracket 2 is rotationally connected to the trolley beam 27, that is, the top of the trolley beam 27 is provided with a hinged hole, the lower end of the second connecting plate 43 is provided with a hinged hole, and the trolley beam 27 and the second connecting plate 43 are rotationally connected by a pin shaft passing through the hinged holes. The top of the trolley frame 26 is provided with a jacking jack 28, and the inner top of the trolley frame 26 is provided with a support foot 29, and the piston rod of the jacking jack 28 passes through the trolley frame 26 and is connected to the support foot 29. The two sides of the trolley frame 26 are respectively provided with a first fixed foot 30, a first clamping driving mechanism 31 for driving the first fixed foot 30 to clamp the main cable 4, and a controller electrically connected to the first clamping driving mechanism 31. The first clamping driving mechanism 31 is rotationally connected to the middle part of the first fixed foot 30. The first clamping driving mechanism 31 is an oil cylinder or an air cylinder or an electric push rod.

[0044] In this embodiment, the trolley frame 26 is a square frame structure.

[0045] As shown in the figure, Figure 10 The sliding frame structure 24 comprises two clamping frames 32, the periphery of the two clamping frames 32 is connected by a plurality of connecting rods 33, the connecting rod 33 is slidingly connected with the trolley frame 26, and the inner top and two sides of the clamping frame 32 are respectively provided with a second fixed foot 34, a second clamping driving mechanism 35 for driving the second fixed foot 34 to clamp the main cable 4, and a controller electrically connected to the second clamping driving mechanism 35. The structure of the second fixed foot 34 is the same as that of the first fixed foot 30, and the second clamping driving mechanism 35 is the same as the first clamping driving mechanism 31.

[0046] The second sliding plate 51 is provided between the connecting rod 33 and the trolley frame 26, which can reduce the friction between the connecting rod 33 and the trolley frame 26 and ensure smooth movement of the connecting rod 33. Preferably, the second sliding plate 51 is made of MGE material.

[0047] In this embodiment, the clamping frame 32 is a square frame structure, and the four corners of the two clamping frames 32 are connected by four connecting rods 33.

[0048] The lower side of the trolley frame 26 and the clamping frame 32 is provided with an open structure, which will not interfere with the cable clamp 44 during movement.

[0049] In one embodiment, as shown in the figure, Figure 7As shown, the sliding drive mechanism 25 comprises a second motor 52, a connecting shaft 53, a support bearing and bearing seat 54, a screw rod 55, and a screw nut 56. The two holding frames 32 are each provided with a support bearing and bearing seat 54, and the two trolley frames 26 are each provided with a screw rod through hole. The screw rod through hole of one of the trolley frames 26 is provided with the screw nut 56, the screw rod 55 passes through the screw nut 56 and the screw rod through holes of the two trolley frames 26 and is threadedly connected with the screw nut 56, and the two ends of the screw rod 55 are installed in the two support bearing and bearing seats 54. One of the holding frames 32 is provided with a motor mounting seat 61, the second motor 52 is installed in the motor mounting seat 61, and the rotating shaft of the second motor 52 is connected with the screw rod 55 through the connecting shaft 53. The second motor 52 is a step motor or a servo motor.

[0050] In one embodiment, the sliding drive mechanism 25 can be an oil cylinder or an electric push rod.

[0051] Further, the opening structure of the trolley frame 26 and the holding frame 32 is provided with a movable blocking rod 57, which comprises a long blocking rod and a short blocking rod. One end of each of the long blocking rod and the short blocking rod is provided with a buckling groove, the long blocking rod and the short blocking rod are buckled with each other through the buckling grooves, and the other end of each of the long blocking rod and the short blocking rod is rotatably connected with the inner wall of the opening structure on two sides. The long blocking rod and the short blocking rod can rotate in the horizontal direction, and the length of the long blocking rod is greater than the length of the short blocking rod (the length of the long blocking rod is about twice the length of the short blocking rod). Figure 9 As shown, a reset spring 58 is arranged between the long blocking rod, the short blocking rod and the inner wall of the opening structure on two sides, and a first limiting block 59 is arranged on the inner wall of the opening structure on two sides. Under the action of the reset spring 58 and the first limiting block 59, the long blocking rod and the short blocking rod automatically rotate to a position perpendicular to the connecting rod 33. The long blocking rod and the short blocking rod are buckled with each other, which can ensure the stress of the first fixed holding foot 30 and the first fixed holding foot 30 when holding the main cable 4 (because the opening structure may be deformed under the counter-thrust of the first holding drive mechanism 31 and the second holding drive mechanism 35), and at the same time, does not hinder the trolley frame 26 and the holding frame 32 passing through the cable clamp 44. That is, when passing through the cable clamp 44, the long blocking rod and the short blocking rod can be rotated to be opened, and then restored to the original state under the action of the reset spring 58. The first limiting block 59 limits the rotation angle of the long blocking rod and the short blocking rod, so that the long blocking rod and the short blocking rod remain perpendicular to the connecting rod 33 (i.e., perpendicular to the main cable 4).

[0052] Further, as shown in FIG. 6, the first fixed holding foot 30 and the second fixed holding foot 31 are arranged on the same side of the trolley frame 26, and the first fixed holding foot 30 and the second fixed holding foot 31 are arranged on the same side of the holding frame 32. Figure 11As shown, the two sides in the trolley frame 26 are respectively provided with supports 69, the top of the supporting foot 29 is provided with a sliding sleeve 62, the sliding sleeve 62 is located between the two supports 69 and is in sliding connection with the two supports 69, the sliding sleeve 62 is provided with a sliding seat 63, the two sides of the sliding seat 63 are respectively provided with second guide rails 64, the second guide rails 64 are in sliding connection with supporting sliding blocks 65, the sliding seat 63 is respectively provided with second limiting blocks 66 corresponding to the two supporting sliding blocks 65, the two supporting sliding blocks 65 are respectively in rotational connection with connecting rods 67, the upper ends of the two connecting rods 67 are in rotational connection with the piston rods of the jacking jack 28 through connecting rod joints 68, the two connecting rods 67 are arranged in an eight-shaped manner with the upper end being smaller and the lower end being larger, and the two sides of the sliding sleeve 62 are provided with clearance holes corresponding to the two supporting sliding blocks 65.

[0053] When the jacking jack 28 is contracted, the piston rod drives the connecting rod 67 to contract, the two supporting sliding blocks 65 slide inward and are retracted into the sliding sleeve 62, the support of the support 69 (i.e. the support of the trolley frame 26) is released, and the supporting foot 29 is driven to slide upward (the second guide rail 64 is driven to rise by the supporting sliding block 65) and is separated from the main cable 4; when the jacking jack 28 is extended, the piston rod drives the connecting rod 67 to expand, the supporting foot 29 is driven to slide downward through the connecting rod 67 and the supporting sliding block 65, and the supporting foot 29 falls back to the main cable 4, and the two supporting sliding blocks 65 slide outward until the two supporting sliding blocks 65 support the support 69, so that the weight of the trolley frame 26 is conducted to the main cable 4 through the support 69, the supporting sliding block 65 and the supporting foot 29. The sliding distance of the supporting sliding block 65 inward is limited by the second limiting block 66, and the sliding distance of the supporting sliding block 65 outward is limited by the extension stroke of the piston rod of the jacking jack 28.

[0054] The jacks and oil cylinders in the application are controlled by the controller to control the unified oil supply of the hydraulic system 36, the motors and electric push rods in the application are controlled by the controller, and the air cylinders in the application are controlled by the controller to control the unified air supply of the air pressure system (prior art).

[0055] A control method of a cable-mounted crane for a wide-bridge-space main cable suspension bridge, comprising, The controller monitors the distance between the two main cables 4 in real time through the main cable distance measuring device 7, and controls the amplitude drive mechanism 3 to drive the sliding bracket 2 to move, so as to change the distance between the two walking frames 5 in real time to adapt to the change of the distance between the two main cables 4. Specifically, the distance monitoring data of the main cable 4 is obtained through the first laser distance meter 18, and the distance monitoring data of the sliding bracket 2 is obtained through the second laser distance meter 22. The two distance monitoring data are transmitted to the controller in real time. After the controller calculates (converts the distance monitoring data into actual distance) and compares the two distance monitoring data, the controller sends an instruction to control the amplitude drive mechanism 3 to act, adjusts the distance between the two sliding brackets 2 at the bottom of the lifting truss 1, and makes the distance between the two sliding brackets 2 adapt to the change of the distance between the two main cables 4.

[0056] The controller monitors the horizontal data of the lifting truss 1 in real time through the horizontal detector, and controls the horizontal adjusting mechanism 6 to act according to the horizontal data, so that the lifting truss 1 always maintains a horizontal posture. Specifically, the horizontal posture of the sliding bracket 2 is controlled by controlling the extension of the posture adjusting jack 15, and the horizontal posture is locked by controlling the linkage of the posture locking electric push rod 14.

[0057] The walking frame 5 is in a stopped state: the jacking jack 28 is extended, the support clamping leg 29 of the trolley frame 26 falls on the main cable 4, the support sliding block 65 on the support clamping leg 29 slides out to support the whole trolley frame 26, and the first fixed clamping leg 30 of the trolley frame 26 and the second fixed clamping leg 34 of the clamping frame 32 are extended to clasp the main cable 4, so that the whole device is fixed on the main cable 4.

[0058] The walking frame 5 is in a walking state: the jacking jack 28 is retracted, the support clamping leg 29 of the trolley frame 26 is lifted, and the support sliding block 65 on the support clamping leg 29 is retracted to be separated from the support of the trolley frame 26. Then, the first fixed clamping leg 30 is retracted to release the main cable 4 (at this time, the weight is conducted to the main cable 4 through the second fixed clamping leg 34), the second motor 52 of the sliding drive mechanism 25 is rotated, the screw rod nut 56 installed on the trolley frame 26 is driven to move forward through the screw rod 55; when the trolley frame 26 moves to the position, the support clamping leg 29 on the trolley frame 26 falls on the main cable 4, the support sliding block 65 on the support clamping leg 29 slides out to support the whole trolley frame 26, and the first fixed clamping leg 30 on the trolley frame 26 is extended to clasp the main cable 4, so that the trolley frame 26 is fixed on the main cable 3. Then, the second fixed clamping leg 34 of the clamping frame 32 is retracted, the second fixed clamping leg 34 releases the main cable 4, and the second motor 52 of the sliding drive mechanism 25 is rotated. At this time, the trolley frame 26 is fixed, the screw rod nut 56 on the trolley frame 26 is not moved, and the screw motion of the screw rod 55 is converted into the forward motion of the clamping frame 32. After the clamping frame 32 slides to the position, the walking action of the trolley frame 26 is repeated.

[0059] The above is only the preferred embodiment of the present application, it should be noted that for those skilled in the art, without departing from the structure of the present application, can also be made several variations and improvements, these will not affect the effect of the present application and the practicality of the patent implementation.

Claims

1. A cable crane for wide deck space main cable suspension bridges, comprising a hoisting truss (1), characterized in that, Also include the controller, level detector, the level detector is installed in the lifting truss (1), the bottom of both ends of the lifting truss (1) is slidably provided with sliding bracket (2), the variable amplitude drive mechanism (3) of driving the sliding bracket (2) reciprocating motion along the both ends of the lifting truss (1), the bottom of the sliding bracket (2) is rotatably connected with the walking frame (5) for walking along the main cable (4), the both ends of the sliding bracket (2) are respectively provided with horizontal adjusting mechanism (6), the main cable distance measuring device (7) is arranged between the two walking frames (5), the controller is electrically connected with the level detector, main cable distance measuring device (7), variable amplitude drive mechanism (3), walking frame (5), horizontal adjusting mechanism (6).

2. A cable crane for a wide deck space main cable suspension bridge according to claim 1, characterized in that, The top of the sliding bracket (2) is slidably connected with the bottom of the lifting truss (1), the both sides of the top of the sliding bracket (2) are respectively provided with baffle (8), the lifting truss (1) is located between the both sides baffle (8), the top of the sliding bracket (2) is further provided with first connecting plate (9), one end of the variable amplitude drive mechanism (3) is rotatably connected with the first connecting plate (9).

3. A cable crane for a wide deck space main cable suspension bridge according to claim 2, characterized in that, The sidewall of the lifting truss (1) is provided with first guide rail (10), the upper and lower sides of the lifting truss (1) are respectively provided with linear array of fixed hole (11), the other end of the variable amplitude drive mechanism (3) is provided with counterforce slide (12) slidably connected with the first guide rail (10), the baffle (8), counterforce slide (12) are all provided with fixed bolt (13) matched with the fixed hole (11).

4. A cable crane for a wide deck space main cable suspension bridge according to claim 1, characterized in that, The horizontal adjusting mechanism (6) includes attitude locking electric push rod (14), attitude adjusting jack (15), the attitude locking electric push rod (14), attitude adjusting jack (15) are respectively located at both sides of the sliding bracket (2), the upper and lower ends of the attitude locking electric push rod (14), attitude adjusting jack (15) are rotatably connected with the sliding bracket (2), walking frame (5) respectively.

5. A cable crane for a wide deck space main cable suspension bridge according to claim 1, characterized in that, The main cable distance measuring device (7) includes two distance measuring components in contact with corresponding main cable (4), the distance measuring component includes roller (16), the elastic expansion rod (17) for pressing the roller (16) on the main cable (4), one end of the elastic expansion rod (17) is connected with the walking frame (5), the mounting bracket of one roller (16) is provided with first laser range finder (18), the mounting bracket of the other roller (16) is provided with laser signal reflector plate (19) corresponding to the first laser range finder (18); The mounting bracket of the roller (16) is further provided with wedge plate (20), the both sides of the wedge plate (20) are provided with wedge surface (21); The main cable distance measuring device (7) further includes second laser range finder (22), the second laser range finder (22) is installed in one of the sliding bracket (2), and is aligned with the side of the other sliding bracket (2).

6. A cable crane for a wide deck space main cable suspension bridge according to claim 1, characterized in that, The walking frame (5) comprises a support trolley structure (23), a sliding frame structure (24) slidingly installed in the support trolley structure (23), and a sliding driving mechanism (25) driving the sliding frame structure (24) to reciprocate in the support trolley structure (23), and the sliding frame structure (24) is sleeved on the periphery of the main cable (4); The support trolley structure (23) comprises two trolley frames (26), a trolley beam (27) connecting the two trolley frames (26), the bottom of the sliding bracket (2) is rotatably connected to the trolley beam (27), the top of the trolley frame (26) is provided with a jacking jack (28), the inner top of the trolley frame (26) is provided with a support foot (29), the piston rod of the jacking jack (28) penetrates the trolley frame (26) and is connected to the support foot (29), and the two sides of the trolley frame (26) are respectively provided with a first fixed foot (30) and a first clamping driving mechanism (31) driving the first fixed foot (30) to clamp the main cable (4).

7. A cable crane for a wide deck space main cable suspension bridge according to claim 6, characterized in that, The two sides in the trolley frame (26) are respectively provided with supports (69), the top of the support foot (29) is provided with a sliding sleeve (62), the sliding sleeve (62) is located between the two supports (69) and is in sliding connection with the two supports (69), the sliding sleeve (62) is provided with a sliding seat (63) therein, the two sides of the sliding seat (63) are respectively provided with second guide rails (64), the second guide rails (64) are in sliding connection with support sliding blocks (65), the middle part of the sliding seat (63) is respectively provided with second limiting blocks (66) corresponding to the two support sliding blocks (65), the two support sliding blocks (65) are respectively rotatably connected with connecting rods (67), the upper ends of the two connecting rods (67) are rotatably connected with the piston rod of the jacking jack (28) through a connecting rod joint (68), the two connecting rods (67) are arranged in an eight-shaped manner with the upper end being smaller and the lower end being larger, and the two sides of the sliding sleeve (62) are provided with clearance holes corresponding to the two support sliding blocks (65).

8. A cable crane for a wide deck space main cable suspension bridge according to claim 6, characterized in that, The sliding frame structure (24) comprises two clamping frames (32), and the peripheries of the two clamping frames (32) are connected by a plurality of connecting rods (33), the connecting rods (33) are in sliding connection with the trolley frame (26), the inner top and the two sides of the clamping frame (32) are respectively provided with second fixed feet (34) and second clamping driving mechanisms (35) driving the second fixed feet (34) to clamp the main cable (4).

9. A cable crane for a wide deck space main cable suspension bridge according to claim 8, characterized in that, The lower sides of the trolley frame (26) and the clamping frame (32) are both provided with an opening structure, and a movable blocking rod (57) is arranged in the opening structure, the movable blocking rod (57) comprises a long blocking rod and a short blocking rod, one end of each of the long blocking rod and the short blocking rod is provided with a buckling groove, the long blocking rod and the short blocking rod are buckled with each other through the buckling grooves, the other end of each of the long blocking rod and the short blocking rod is rotatably connected with the inner wall of the opening structure on the two sides, a reset spring (58) is arranged between the long blocking rod, the short blocking rod and the inner wall of the opening structure on the two sides, and the inner wall of the opening structure on the two sides is provided with a first limiting block (59).

10. A control method for a cable crane of a wide deck space main cable suspension bridge, characterized by, The method comprises, The controller monitors the distance between the two main cables (4) in real time through the main cable distance measuring device (7), and controls the amplitude driving mechanism (3) to drive the sliding bracket (2) to move according to the distance between the two main cables (4), so as to change the distance between the two walking frames (5) in real time to adapt to the change of the distance between the two main cables (4); The controller monitors the horizontal data of the lifting truss (1) in real time through the horizontal detector, and controls the horizontal adjusting mechanism (6) to act according to the horizontal data, so that the lifting truss (1) always maintains a horizontal posture.

Images