CN118125310A - Mobile crane based on suspension bridge main cable - Google Patents
Mobile crane based on suspension bridge main cable Download PDFInfo
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- CN118125310A CN118125310A CN202410545503.0A CN202410545503A CN118125310A CN 118125310 A CN118125310 A CN 118125310A CN 202410545503 A CN202410545503 A CN 202410545503A CN 118125310 A CN118125310 A CN 118125310A
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Abstract
The invention relates to the field of mobile cranes, and discloses a mobile crane based on a main cable of a suspension bridge. The traveling speed of the mobile crane is ensured by enough wind resistance stability.
Description
Technical Field
The invention relates to the field of mobile cranes, in particular to a mobile crane based on a main cable of a suspension bridge.
Background
In the construction of a suspension bridge, two main cables are usually required to be constructed firstly, the main cables are used as upper main bearing members, then a movable crane is arranged on the two main cables, two sides of the movable crane respectively move on the main cables through a travelling mechanism, and a traction device provides moving power for the travelling mechanism, so that the main cables are used as main bearing members, and the members and materials are transported to a set position through the movable crane, so that the construction and the transportation are facilitated.
However, mobile cranes need to move precisely on the main cable and perform complex lifting and positioning tasks, which require a high degree of intelligence and accuracy in their control systems. However, the large span suspension bridge is often located in open water or a strong wind area, and the main cable is easily swayed by the influence of wind load, thereby influencing the safety of overhead operation of the mobile crane. The structural design and control system of the existing mobile crane may show insufficient wind resistance stability under the strong wind condition, so that the operation safety is reduced, the construction efficiency is blocked, and even the operation is stopped temporarily to avoid risks, so that the walking speed of the mobile crane is greatly influenced.
Disclosure of Invention
The invention aims to provide a mobile crane based on a main cable of a suspension bridge, which has enough wind resistance stability and ensures the travelling speed of the mobile crane.
In order to achieve the above purpose, the invention adopts the following technical scheme: the utility model provides a mobile crane based on suspension bridge main rope, includes hoisting mechanism, two main ropes, two tracks and two running gear, and two running gear articulates respectively in hoisting mechanism both sides, and two running gear lower extreme all articulates has two at least walking roller components, and walking roller component can remove on the track, and the track is rigid material, and the track setting is on the main rope.
The beneficial effect of this scheme is:
Under wind load effect, the main cable can produce vertically and make a round trip to drive track and running gear on the main cable and make a round trip to rock, and in this scheme, this kind of rocking releases at running gear and hoisting mechanism's articulated position, and specific running gear begins when rocking, hoisting mechanism can not take place synchronous rocking with running gear owing to self weight and the heavy object that lifts by crane thereof, thereby make running gear and hoisting mechanism take place relative rotation, and when hoisting mechanism begins to rock, running gear has rocked extreme position, begins reverse direction and rocks. Therefore, for running gear and hoist mechanism fixed connection, hoist mechanism's in this scheme rocks the range littleer to improve hoist mechanism's wind-resistant stability, reduced hoist mechanism and gone up hoist material's of hoist cargo and rocked, increased the construction security. Under wind load effect, the main cable produces and rocks the deformation, in order to satisfy the support requirement, running gear adopts rigid material usually, simultaneously, and the main cable is parabolic generally, can't adapt to the deformation of main cable completely, therefore running gear can't remove fast on the main cable, card on the main cable even easily, and in this scheme, set up the track on the main cable, compare in the main cable, the track is more difficult for deformation, running gear removes on the track, receives the deformation influence of main cable less, and travel speed is faster, difficult card is on the main cable. Further, the walking roller assembly comprises an assembly shell and at least two walking rollers, the walking rollers are all columns with annular sections and are horizontally arranged, a rotating shaft is arranged on the inner side of the assembly shell, the rotating shaft penetrates through the walking rollers and is in sliding and rotating connection with the walking rollers, and a gap is reserved between the walking rollers and the assembly shell; limiting parts are arranged at two ends of the walking roller, the limiting parts radially protrude relative to the cross section of the walking roller, and the width of the track is smaller than the interval between the two limiting parts.
Further, the rail is a box-shaped section, and an upper flange and a lower flange are respectively arranged on the upper side and the lower side of the box-shaped section; the track adopts sectional type design, and a plurality of sections of track are arranged on the main cable in a head-to-tail articulated manner, and track and main cable pass through the connecting piece and connect.
Further, the connecting piece comprises an opposite joint hoop and rail pressing devices, the opposite joint hoop is locked on the main cable, the opposite joint hoop is arranged at the end part of each section of track, a plurality of rail pressing devices are arranged on the upper side of the opposite joint hoop, the rail pressing devices comprise fixing pieces and elastic pieces which are mutually connected, the fixing pieces are connected with the upper surfaces of the opposite joint hoops, the fixing pieces transversely limit the lower flanges of the tracks, the fixing pieces comprise arched parts, the lower sides of the arched parts are provided with horizontal cylindrical grooves with sector sections, and clamping grooves are formed in the spaces between the cylindrical grooves and the upper sides of the opposite joint hoops; the elastic piece is a strip-shaped piece which is bent for many times, two ends of the elastic piece are respectively a straight rail pressing section and a fixed section which are horizontally arranged, a part, which is positioned between the rail pressing section and the fixed section, of the spring piece is a bending section, the fixed section is clamped into the clamping groove, friction force is generated between the fixed section and the clamping groove, when the external force is larger than the friction force, the fixed section can slide relative to the clamping groove, the rail pressing section is pressed on the lower flange of the rail, and the rail pressing section is pressed on the lower flange of the rail by utilizing the elasticity of the bending section; the bending section is locally pressed on the fixing piece by self elasticity, and provides a reaction force for the rail pressing section to press on the rail.
Further, the assembly shell bottom is provided with a bottom plate, two sides of the bottom plate are respectively vertically provided with an anti-falling lug plate, two anti-falling protrusions are arranged on the inner sides of the anti-falling lug plates, the distance between the two anti-falling protrusions is between the width of the upper flange of the rail and the width of the body of the rail, and the distance between the two anti-falling lug plates is larger than the width of the upper flange of the rail.
Further, a temporary hoop is arranged on the lower side of the travelling mechanism and comprises a fixed plate, the fixed plate is connected with the lower side of the travelling mechanism, two sides of the fixed plate are respectively provided with a hoop plate, the upper part of the hoop plate is a vertical part, the vertical upper end of the hoop plate is hinged with the fixed plate, the lower part of the hoop plate is an arc part, the lower ends of the arc parts are provided with counterweight parts, and the lower ends of the arc parts of the two hoop plates are connected through bolts, so that a main cable is locked across a track;
after the bolts of the arc-shaped parts of the two hoop plates are taken down, the hoop plates loosen the main cable, the hoop plates rotate around the fixed plate under the action of dead weight, a clearance gap is formed between the hoop plates and the main cable, and when the traveling roller assembly drives the traveling mechanism to move, the involution hoop can pass through the clearance gap.
Further, the lower end of the travelling mechanism is also provided with an adjusting jack, the adjusting jacks are arranged between the two travelling roller assemblies, and the lower ends of the adjusting jacks can be jacked on the track.
The scheme has the following effects:
1. In the prior art, the main cable is approximately parabolic, the track is adapted to the shape of the main cable, the track is also approximately parabolic as a whole, and because the positions of the different walking roller assemblies are different, the radian of the main cable at different positions is different, if the walking mechanism and the walking roller assemblies are rigidly connected, the walking roller assemblies cannot be well adapted to the shape of the main cable, and the possibility of partial position void exists, so that the construction safety is reduced; in this scheme, running gear and walking roller subassembly are articulated, and walking roller subassembly can be rotatory for running gear to according to the shape automatic adaptation angle of main cable, laminate more with the main cable, make walking roller subassembly be difficult to block, guaranteed the construction safety.
2. The walking roller component limits the transverse movement of the walking roller component through the limiting part, so that the walking roller component is ensured not to be transversely derailed. When the strong wind is scraped, the main cable can produce transverse deformation, and the rolling of walking gyro wheel is hindered easily, and in this scheme, leave the clearance between walking gyro wheel and the subassembly casing, allow the walking gyro wheel to be can for subassembly casing lateral shifting to can adapt to the deformation that the main cable produced to a certain extent, and then make the rolling of walking gyro wheel more smooth and easy. When the deviation between the center line of the walking roller and the track is large, an eccentric force is easily generated between the walking roller and the track, and the walking roller is easily inclined to one side of the track so as to cause derailment; in this scheme, through bottom plate, anticreep otic placode and anticreep arch spacing to orbital top flange, and then can avoid walking gyro wheel to take place because the slope derailment.
3. According to the scheme, the high-strength bolts are used for tightly fastening the opposite-joint anchor ear, so that the opposite-joint anchor ear is fastened on the main cable, the rail is fixed on the opposite-joint anchor ear through the rail pressing device, the rail pressing device allows the rail to longitudinally move relative to the opposite-joint anchor ear and allows the rail to vertically move against the elasticity of the elastic piece; because the main cable is of a flexible structure and is parabolic, when the track is stressed, the elastic rail pressing device can be properly deformed, so that the track and the involution anchor ear are prevented from being damaged.
4. The temporary anchor ear can lock the main rope when work needs or equipment trouble, effectively prevent the loop wheel machine because of the potential safety hazard that unexpected removal caused, ensure the safety and stability of maintenance operation process, during normal movement, take down the bolt of temporary anchor ear can, can not influence running gear's moving, after the bolt of the arc portion of two hoop boards is taken down, the hoop board loosens the main rope, because the focus position of hoop board is through counter weight portion adjustment, the hoop board forms between hoop board and the main rope and keeps away the empty space around the fixed plate rotatory back under the dead weight effect, the walking gyro wheel subassembly drives running gear and removes, the connecting piece can pass and keeps away the empty space, thereby avoid connecting piece and hoop board to bump. At this time, if wind load is increased, the main cable is transversely deformed, but the distance is far, so that naked eyes of people can not be observed; at the moment, the friction force between the travelling mechanism and the main cable is increased, the travelling roller horizontally slides on the rotating shaft to adapt to the deformation of the main cable, but the horizontal sliding can lead to the reduction of the interval between the hoop plate at one side and the main cable, so that the clearance is reduced, and the involution anchor ear on the main cable cannot pass through the clearance, thereby preventing the travelling mechanism from advancing, further leading an operator to realize that the wind load is overlarge and needing to stop the operation in time;
5. Compared with the scheme without the track, the scheme optimizes the moving surface (the contact surface of the running mechanism and the track) of the running mechanism, so that the moving surface of the running mechanism is flatter and more durable, and as each section of track is straight, the moving track of the running mechanism is less influenced by the deformation of the main cable, and the moving speed of the running mechanism can be accelerated;
Because the main cable is parabolic, the slopes of two adjacent sections of tracks are different, and when the travelling mechanism passes between the two sections of tracks, the travelling mechanism is easy to vibrate due to abrupt change of the slopes; in the scheme, the normal direction of the contact surface of the walking roller mechanism and the rail is the supporting force direction of the rail to the walking roller mechanism; the running roller mechanism at the front end of the running mechanism is preferentially contacted with the next section of track and rotates along with the slope of the next section of track relative to the running mechanism, at the moment, the supporting force direction of the running mechanism at the front end is inclined towards one side close to the last section of track, the supporting force is decomposed into a deceleration component force and a steering component force, the deceleration component force is parallel to the last section of track, the running mechanism can be decelerated, the steering component force is perpendicular to the deceleration component force, and the advancing direction of the running mechanism can be changed; compared with the fixed connection of the running mechanism and the running roller mechanism, the running mechanism and the running roller mechanism are hinged in the scheme, and the running roller mechanism can rotate relative to the running mechanism, so that the supporting force direction inclination angle of the running roller mechanism at the front end is larger, more supporting force is decomposed into a deceleration component force, the deceleration effect of the running mechanism is enhanced, and the running mechanism can pass through the position between two sections of tracks more stably.
Because the main cable is parabolic, the curvature constantly changes, therefore the difference of the slope of two adjacent sections of orbits is also different, the closer to the fixed end of the main cable, the greater the difference of the slope of two adjacent sections of orbits is, the greater the vibration degree that occurs when the travelling mechanism passes between two sections of orbits is, and in the scheme, the greater the angle that the direction of the supporting force of the travelling roller mechanism at the front end of the travelling mechanism changes is when the travelling mechanism passes through the track section position is, the greater the decomposition of more supporting force is a deceleration component, the deceleration effect of the travelling mechanism is more obvious, and therefore the deceleration effect can change along with the position where the travelling mechanism is located.
Drawings
FIG. 1 is a schematic illustration of a main cable of an embodiment of a suspension bridge;
FIG. 2 is an overall three-dimensional isometric view of an embodiment;
FIG. 3 is an enlarged view of FIG. 2 at A;
FIG. 4 is a three-dimensional isometric view of a running roller assembly of an embodiment;
FIG. 5 is a top view of a walking roller assembly of an embodiment;
FIG. 6 is a schematic illustration of an adjustment of an embodiment of a running gear as it moves;
FIG. 7 is an enlarged view at B in FIG. 2;
FIG. 8 is an enlarged view of FIG. 7 at C;
FIG. 9 is a left side view of FIG. 3;
FIG. 10 is a front cross-sectional view of FIG. 3;
FIG. 11 is an enlarged view of FIG. 10 at D;
FIG. 12 is a cross-sectional view of a track of an embodiment;
fig. 13 is a schematic diagram of a traction mechanism of an embodiment.
Detailed Description
The following is a further detailed description of the embodiments:
Reference numerals in the drawings of the specification include: the hoisting mechanism 1, the truss frame 11, the hoisting winch 12, the hoisting cable 13, the travelling mechanism 2, the temporary fixing hole 21, the temporary anchor 22, the fixing plate 221, the vertical portion 222, the arc portion 223, the counterweight portion 224, the adjusting jack 23, the travelling roller assembly 3, the assembly housing 31, the travelling roller 32, the stopper portion, the rotation shaft 34, the bottom plate 35, the anti-slip lug 36, the anti-slip protrusion 37, the track 4, the upper flange 41, the lower flange 42, the convex portion 43, the concave portion 44, the connecting pin 45, the traction cable 51, the traction pulley 52, the traction winch 53, the main cable 6, the involution anchor 61, the fixing piece 62, the arc portion 621, the elastic piece 63, the rail pressing section 631, the bending section 632, the fixing section 633, the cable clip 7, the cable tower 8, the pier 9
Examples
The embodiment is substantially as shown in fig. 1-13: the utility model provides a mobile crane based on suspension bridge main rope, including hoisting mechanism 1, traction mechanism, two main ropes 6, two tracks 4 and two running gear 2, as shown in figure 1, main rope 6 is the main bearing structure on the suspension bridge, the suspension bridge includes two towers 8, be equipped with a plurality of pier studs 9 between the towers 8, main rope 6 sets up above pier studs 9, main rope 6 both ends are fixed respectively in the upper end of the towers 8, be equipped with a plurality of connecting pieces on the main rope 6, all be connected through connecting piece and track 4 on each main rope 6, track 4 is rigid material, each track 4 adopts sectional type design, a plurality of sections track 4 articulatedly are arranged on main rope 6 head and tail; as shown in fig. 7 and 9, the main cable 6 is provided with a cable clip 7, the cable clip 7 is used for connecting slings in the prior art, and the cable crane is a structure for connecting a bridge and the main cable 6 in the prior art.
As shown in fig. 2, the lifting mechanism 1 comprises a truss frame 11, wherein a lifting winch 12 is connected in the truss frame 11 through bolts, a lifting cable 13 is connected to the lifting winch 12, and the lower end of the lifting cable 13 can be connected with a material to be transported; as shown in fig. 2 and 3, two travelling mechanisms 2 are respectively hinged at two sides of the lifting mechanism 1, two travelling roller assemblies 3 are respectively hinged at the lower ends of the two travelling mechanisms 2, and in this embodiment, the hinging modes of the two structures are as follows: the two structures are penetrated through by the hinge shaft at the same time and are connected with the two structures in a rotating way, and certain friction force is formed between the hinge shaft and the two structures, so that damping is formed, and the hinge shaft can rotate relative to the two structures only when the external force is larger than the friction force.
As shown in fig. 12, the rail 4 has a box-shaped cross section, and an upper flange 41 and a lower flange 42 are respectively arranged on the upper side and the lower side of the box-shaped cross section; as shown in fig. 8, one end of the rail 4 is provided with a convex part 43, the other end of the rail 4 is provided with a concave part 44, the shapes of the convex part 43 and the concave part 44 are matched with each other, the convex part 43 and the concave part 44 are provided with elongated pin holes, and a connecting pin 45 is arranged in each pin hole; in the position where the two rails 4 are hinged, the convex portion 43 of one rail 4 is inserted into the concave portion 44 of the other rail 4, and as shown in fig. 11, the connecting pin 45 passes through the pin holes of the convex portion 43 and the concave portion 44 at the same time and is rotatably connected with the two pin holes.
The connecting piece comprises an opposite joint hoop 61 and a rail pressing device, the opposite joint hoop 61 is held on the main cable 6, as shown in fig. 9 and 10, the lower end of the opposite joint hoop 61 is provided with a bolt hole, the lower end of the opposite joint hoop 61 is screwed by a bolt, in the embodiment, the opposite joint hoop 61 is fixed on the main cable 6 by adopting high-strength bolt screwing; the involution anchor ear 61 is arranged at the end part of each section of track 4, and a plurality of rail presses are arranged on the upper side of the involution anchor ear 61; the upper surface of the apposition anchor ear 61 is higher than the upper surface of the cable clamp 7.
As shown in fig. 8 and 11, the rail pressing device comprises a fixing piece 62 and an elastic piece 63 which are connected with each other, the upper surfaces of the fixing piece 62 and the involution anchor ear 61 are welded, the fixing piece 62 comprises an arch part 621, a horizontal cylindrical groove with a fan-shaped section is formed on the lower side of the arch part 621, and a clamping groove is formed in the space between the cylindrical groove and the upper side of the involution anchor ear 61; the elastic member 63 is a strip-shaped member that is bent for multiple times, two ends of the elastic member 63 are respectively a straight rail pressing section 631 and a fixing section 633, and a portion of the spring member located between the rail pressing section 631 and the fixing section 633 is a bending section 632, in this embodiment, the bending section 632 is bent for four times; the fixed section 633 is clamped into the clamping groove, a friction force is arranged between the fixed section 633 and the clamping groove, and when the external force is larger than the friction force, the fixed section 633 can longitudinally slide relative to the clamping groove. In this embodiment, the longitudinal direction is the length direction of the track 4; the rail pressing section 631 presses the lower flange 42 of the track 4 by the elasticity of the bending portion, and the bending section 632 locally presses the fixing piece 62 by the elasticity of the bending portion, so as to provide a reaction force for the rail pressing section 631 to press the track 4.
As shown in fig. 4, the running roller assembly 3 includes an assembly housing 31 and two running rollers 32, the assembly housing 31 is a strip-shaped housing, two rotating shafts 34 are connected to the inner side of the assembly housing 31 by bolts in the width direction, the centers of the two rotating shafts 34 are located on the longitudinal (length direction) central axis of the assembly housing 31, and the rotating shafts 34 pass through the running rollers 32 and are connected with the running rollers 32 in a sliding and rotating manner, as shown in fig. 5, a gap is left between the running rollers 32 and the assembly housing 31.
As shown in fig. 4 and 5, the running roller 32 is a cylinder with an annular section and is horizontally arranged, both ends of the running roller 32 are respectively provided with a limiting part 33, the limiting parts 33 are annular discs, the limiting parts 33 radially protrude relative to the section of the running roller 32, namely, the outer diameter of the limiting parts 33 is larger than the outer diameter of the running roller 32, the width of the track 4 is smaller than the interval between the two limiting parts 33, and the running roller 32 can roll on the track 4.
As shown in fig. 4, the bottom of the assembly housing 31 is integrally formed with a bottom plate 35, two sides of the bottom plate 35 are respectively vertically welded with an anti-drop lug plate 36, two anti-drop protrusions 37 are welded on the inner side of each anti-drop lug plate 36, as shown in fig. 11, the distance between the two anti-drop protrusions 37 is between the width of the upper flange 41 of the track 4 and the width of the body of the track 4, and the distance between the two anti-drop lug plates 36 is larger than the width of the upper flange 41 of the track 4.
As shown in fig. 9, two temporary hoops 22 are arranged between the two traveling roller assemblies 3, the temporary hoops 22 can lock the main cable 6, as shown in fig. 10, the temporary hoops 22 comprise a fixing plate 221, the fixing plate 221 is connected with a temporary fixing hole 21 on the lower side of the traveling mechanism 2 through bolts, two sides of the fixing plate 221 are respectively hinged with a hoop plate, the lower ends of the two hoop plates are connected through bolts, and the two hoop plates can be matched to lock the main cable 6; the upper part of the hoop plate is a vertical part 222, the vertical upper end of the hoop plate is hinged with the fixed plate 221, the lower part of the hoop plate is an arc-shaped part 223, the lower ends of the arc-shaped parts 223 are welded with a counterweight part 224, and the lower ends of the arc-shaped parts 223 of the two hoop plates are connected through bolts, so that a main cable 6 is locked across a track 4; when the bolts of the arc-shaped parts 223 of the two hoop plates are taken down, the hoop plates loosen the main cable 6, the hoop plates rotate around the fixed plate 221 under the action of dead weight, a clearance gap (not shown in the figure) is formed between the hoop plates and the main cable 6, and when the traveling roller assembly 3 drives the traveling mechanism 2 to move, the cable clamp 7 and the involution hoop 61 can both pass through the clearance gap.
As shown in the figure, two adjusting jacks 23 are further arranged between the two temporary hoops 22, the upper sides of the adjusting jacks 23 are connected with the travelling mechanism 2 through bolts, and the lower ends of the adjusting jacks 23 can be jacked on the track 4.
As shown in fig. 13, the traction mechanisms comprise traction steel ropes 51, traction pulleys 52 and traction winches 53, the traction winches 53 are connected to the top ends of the towers 8 of the suspension bridge in a bolt mode, namely, the fixed ends of the main ropes 6 are connected to the left ends of the travelling mechanisms 2 in a bolt mode, as shown in fig. 9, the travelling mechanisms 2 are shown in a rectangular frame mode, the traction steel ropes 51 penetrate through the traction pulleys 52, one ends of the traction steel ropes 51 are connected with the traction winches 53, the other ends of the traction steel ropes 51 are anchored to the top ends of the towers 8, and as the main ropes 6 are parabolic, two traction mechanisms of the invention can be installed on one main rope 6 according to the situation, and the corresponding traction mechanisms are respectively arranged on the top ends of the two towers 8, so that the transportation range covers the whole length of the main ropes 6.
The using method of the mobile crane based on the suspension bridge main cable comprises the following steps:
1. In the prior art, the main cable 6 is approximately parabolic, the track 4 is adapted to the shape of the main cable 6, the track 4 is also approximately parabolic as a whole, and because different walking roller assemblies 3 are positioned differently, the radian of the main cable 6 is different at different positions, if the walking mechanism 2 and the walking roller assemblies 3 are rigidly connected, the walking roller assemblies 3 cannot be well adapted to the shape of the main cable 6, so that the possibility of partial position void exists, and the construction safety is reduced; in this scheme, running gear 2 and walking roller subassembly 3 are articulated, and walking roller subassembly 3 can be rotatory for running gear 2 to according to the shape automatic adaptation angle of main cable 6, laminate more with main cable 6, make walking roller subassembly 3 be difficult to block, guaranteed the construction safety.
2. The walking roller assembly 3 limits the transverse movement of the walking roller assembly 3 through the limiting part 33, so that the walking roller assembly 3 is ensured not to be transversely derailed. When the strong wind is blown, the main cable 6 can generate transverse deformation, the rolling of the walking roller 32 is easy to form a hindrance, and in the scheme, a gap is reserved between the walking roller 32 and the component shell 31, so that the walking roller 32 is allowed to transversely move relative to the component shell 31, the deformation generated by the main cable 6 can be adapted to a certain extent, and the rolling of the walking roller 32 is smoother. When the center line deviation between the running roller 32 and the track 4 is large, an eccentric force is easily generated between the running roller 32 and the track 4, and the running roller 32 is easily inclined to one side of the track 4 so as to cause derailment; in this scheme, the upper flange 41 of the track 4 is limited by the bottom plate 35, the anti-falling lug plate 36 and the anti-falling protrusion 37, so that derailment of the walking roller 32 due to inclination can be avoided.
3. The scheme is that the buckling anchor ear 61 is tightly fixed on the main cable 6 through high-strength bolts, the track 4 is fixed on the buckling anchor ear 61 through a rail pressing device, and the rail pressing device allows the track 4 to longitudinally move relative to the buckling anchor ear 61 and allows the track 4 to vertically move against the elasticity of the elastic piece 63; because the main cable 6 is of a flexible structure and is parabolic, when the track 4 is stressed, the elastic rail pressing device can be properly deformed, so that the track 4 and the involution anchor ear 61 are prevented from being damaged.
4. The temporary anchor ear 22 can lock the main rope 6 when work needs or equipment trouble, effectively prevent the loop wheel machine because of the potential safety hazard that unexpected removal caused, ensure the safety and stability of maintenance operation process, during normal removal, take off the bolt of temporary anchor ear 22 can, can not influence running gear 2's moving, after the bolt of the arc portion 223 of two hoop boards is taken off, the hoop board loosens main rope 6, because the focus position of hoop board passes through counter weight portion 224 adjustment, the hoop board forms between hoop board and the main rope 6 and keeps away the empty space under the dead weight effect after rotatory around fixed plate 221, when walking roller assembly 3 drives running gear 2 and removes, the connecting piece can pass and keep away the empty space, thereby avoid connecting piece and hoop board to bump. At this time, if the wind load is increased, the main cable 6 is transversely deformed, but the distance is far, so that the human eyes can not necessarily observe the wind load; at this time, the friction between the travelling mechanism 2 and the main cable 6 is increased, the travelling roller 32 horizontally slides on the rotating shaft 34 to adapt to the deformation of the main cable 6, but the horizontal sliding can lead to the reduction of the interval between the hoop plate on one side and the main cable 6, so that the clearance is reduced, and the involution hoop 61 on the main cable 6 cannot pass through the clearance, so that the travelling mechanism 2 is prevented from advancing, and an operator realizes that the wind load is overlarge and needs to stop the operation in time;
5. Compared with the scheme without the track 4, the scheme optimizes the moving surface of the travelling mechanism 2 (the contact surface of the travelling mechanism 2 and the track 4), so that the moving surface of the travelling mechanism 2 is flatter and more durable, and as each section of the track 4 is straight, the moving track of the travelling mechanism 2 is less influenced by the deformation of the main cable 6, and the moving speed of the travelling mechanism 2 can be accelerated;
Because the main cable 6 is parabolic, the slopes of two adjacent sections of tracks 4 are different, and when the travelling mechanism 2 passes between the two sections of tracks 4, the travelling mechanism 2 is easy to vibrate due to abrupt slope changes; in the scheme, the normal direction of the contact surface of the walking roller 32 mechanism and the track 4 is the supporting force direction of the track 4 to the walking roller 32 mechanism; as shown in fig. 6, since the running roller 32 mechanism is hinged to the running mechanism 2, the running roller 32 mechanism at the front end of the running mechanism 2 is preferentially contacted with the next track 4 and rotates relative to the running mechanism 2 along with the slope of the next track 4, at this time, the supporting force direction of the running mechanism 2 at the front end is inclined towards one side close to the previous track 4, the supporting force is decomposed into a deceleration component and a steering component, the deceleration component is parallel to the previous track 4, the running mechanism 2 can be decelerated, the steering component is perpendicular to the deceleration component, and the advancing direction of the running mechanism 2 can be changed; compared with the running mechanism 2 and the running roller 32 mechanism which are fixedly connected, in the scheme, the running mechanism 2 is hinged with the running roller 32 mechanism, and the running roller 32 mechanism can rotate relative to the running mechanism 2, so that the supporting force direction inclination angle of the running roller 32 mechanism at the front end is larger, more supporting force is decomposed into a deceleration component force, the deceleration effect of the running mechanism 2 is enhanced, and the running mechanism 2 can pass through the position between the two sections of tracks 4 more stably.
Because the main cable 6 is parabolic, the curvature is continuously changed, the difference value of the slopes of the two adjacent sections of tracks 4 is also different, the closer to the fixed end of the main cable 6, the larger the difference value of the slopes of the two adjacent sections of tracks 4 is, the greater the degree of vibration occurs when the travelling mechanism 2 passes between the two sections of tracks 4, and in the scheme, the closer to the fixed end of the main cable 6 is, the greater the angle of the change of the supporting force direction of the travelling roller 32 mechanism at the front end of the travelling mechanism 2 is, the more the supporting force is decomposed into a deceleration component, and the deceleration effect of the travelling mechanism 2 is more obvious, so that the deceleration effect can change along with the position of the travelling mechanism 2.
The foregoing is merely exemplary of the present application, and specific technical solutions and/or features that are well known in the art have not been described in detail herein. It should be noted that, for those skilled in the art, several variations and modifications can be made without departing from the technical solution of the present application, and these should also be regarded as the protection scope of the present application, which does not affect the effect of the implementation of the present application and the practical applicability of the patent. The protection scope of the present application is subject to the content of the claims, and the description of the specific embodiments and the like in the specification can be used for explaining the content of the claims.
Claims (5)
1. A mobile crane based on suspension bridge main rope, its characterized in that: the device comprises a hoisting mechanism, two main cables, two rails and two travelling mechanisms, wherein the two travelling mechanisms are respectively hinged to two sides of the hoisting mechanism, the lower ends of the two travelling mechanisms are hinged to at least two travelling roller assemblies, the travelling roller assemblies can move on the rails, the rails are made of rigid materials, and the rails are arranged on the main cables; the walking roller assembly comprises an assembly shell and at least two walking rollers, the walking rollers are all columns with annular sections and are horizontally arranged, a rotating shaft is arranged on the inner side of the assembly shell, the rotating shaft penetrates through the walking rollers and is connected with the walking rollers in a sliding and rotating mode, and a gap is reserved between the walking rollers and the assembly shell; limiting parts are arranged at two ends of the walking roller, the limiting parts radially protrude relative to the cross section of the walking roller, and the width of the track is smaller than the interval between the two limiting parts; the track is a box-shaped section, and an upper flange and a lower flange are respectively arranged on the upper side and the lower side of the box-shaped section; the track adopts sectional type design, and a plurality of sections of track are arranged on the main cable in a head-to-tail articulated manner, and track and main cable pass through the connecting piece and connect.
2. A mobile crane based on a suspension bridge main cable according to claim 1, characterized in that: the connecting piece comprises an opposite-closing hoop and rail pressing devices, the opposite-closing hoop is locked on the main cable, the opposite-closing hoop is arranged at the end part of each section of track, a plurality of rail pressing devices are arranged on the upper side of the opposite-closing hoop, each rail pressing device comprises a fixing piece and an elastic piece which are mutually connected, the fixing piece is connected with the upper surface of the opposite-closing hoop, the fixing piece transversely limits the lower flange of the track and comprises an arch part, a horizontal cylindrical groove with a fan-shaped section is arranged on the lower side of the arch part, and a clamping groove is formed in a space between the cylindrical groove and the upper side of the opposite-closing hoop; the elastic piece is a strip-shaped piece which is bent for many times, two ends of the elastic piece are respectively a straight rail pressing section and a fixed section which are horizontally arranged, a part, which is positioned between the rail pressing section and the fixed section, of the spring piece is a bending section, the fixed section is clamped into the clamping groove, friction force is generated between the fixed section and the clamping groove, when the external force is larger than the friction force, the fixed section can slide relative to the clamping groove, the rail pressing section is pressed on the lower flange of the rail, and the rail pressing section is pressed on the lower flange of the rail by utilizing the elasticity of the bending section; the bending section is locally pressed on the fixing piece by self elasticity, and provides a reaction force for the rail pressing section to press on the rail.
3. A mobile crane based on a suspension bridge main cable according to claim 2, characterized in that: the subassembly casing bottom is equipped with the bottom plate, and the bottom plate both sides are vertical respectively to be equipped with anticreep otic placode, and the inboard of anticreep otic placode is equipped with two anticreep archs, and two anticreep bellied interval sizes are between orbital top flange width and orbital body width, and the interval of two anticreep otic placodes is greater than orbital top flange width.
4. A mobile crane based on a suspension bridge main cable according to claim 3, characterized in that: the lower side of the travelling mechanism is provided with a temporary hoop, the temporary hoop comprises a fixed plate, the fixed plate is connected with the lower side of the travelling mechanism, two sides of the fixed plate are respectively provided with a hoop plate, the upper part of the hoop plate is a vertical part, the vertical upper end of the hoop plate is hinged with the fixed plate, the lower part of the hoop plate is an arc part, the lower end of the arc part is provided with a counterweight part, and the lower ends of the arc parts of the two hoop plates are connected through bolts, so that a main cable is locked across a track;
After the bolts of the arc-shaped parts of the two hoop plates are taken down, the hoop plates loosen the main cable, the hoop plates rotate around the fixed plate under the action of dead weight, a clearance gap is formed between the hoop plates and the main cable, and when the traveling roller assembly drives the traveling mechanism to move, the involution hoops on the main cable can pass through the clearance gap.
5. A mobile crane based on a suspension bridge main cable according to claim 4, wherein: the lower end of the travelling mechanism is also provided with an adjusting jack, the adjusting jacks are arranged between the two travelling roller assemblies, and the lower ends of the adjusting jacks can be jacked on the track.
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| CN202410545503.0A CN118125310A (en) | 2024-05-06 | 2024-05-06 | Mobile crane based on suspension bridge main cable |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202410545503.0A CN118125310A (en) | 2024-05-06 | 2024-05-06 | Mobile crane based on suspension bridge main cable |
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| CN101787677A (en) * | 2009-01-23 | 2010-07-28 | 柳州欧维姆机械股份有限公司 | Method for erecting girder of suspension bridge by double-hoisting hydraulic NC (numerical control) cable crane |
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