A self-balancing bridge erecting machine

Abstract

The present application relates to a kind of self-balancing bridge erecting machine, belong to the technical field of bridge erecting machine equipment.It includes two parallelly arranged main beams, the main beam front end sliding erection has vice beam, two the main beam between through crossbeam connection, the main beam bottom is sequentially provided with rear leg, middle support, front leg along the direction of travel, the vice beam front end bottom is provided with vice leg, the rear leg, middle support, front leg and vice leg are all for telescopic structure controlled by hydraulic jack, to adapt to different transverse slope and pre-camber special bridge deck, the front leg, middle support and rear leg are all equipped with hanger wheel mechanism, the hanger wheel mechanism is used to support main beam and travel in construction direction, the front leg, middle support and rear leg bottom are all equipped with horizontal shift mechanism.Through the present application, it solves the problem that traditional bridge erecting machine cannot adapt to different transverse slope and pre-camber special bridge deck in construction, and improves the construction speed of composite beam bridge.

Description

TECHNICAL FIELD

[0001] The present application relates to a self-balancing bridge erecting machine, belonging to the technical field of bridge erecting machine equipment. BACKGROUND

[0002] With the continuous acceleration of China's modernization process, the requirement for infrastructure construction speed is also continuously improved. Considering that the prefabricated assembly degree of steel structure has reached a very high level, to speed up the construction speed of steel-concrete composite beam bridge, obviously the bridge erecting machine is the most suitable equipment for efficient construction of steel-concrete composite beam bridge. However, the traditional bridge erecting machine has poor adaptability, low construction efficiency and insufficient precision when facing special bridge surfaces with complex terrain, different transverse and longitudinal slopes and pre-arches. Especially in mountainous areas, hilly areas or complex urban environments, the transverse and longitudinal slopes of the bridge change greatly, and different pre-arch requirements need to be met, and the traditional bridge erecting machine is difficult to meet the construction requirements under multiple working conditions.

[0003] Therefore, a new scheme is needed to solve this problem. SUMMARY

[0004] The technical problem to be solved by the present application is to provide a self-balancing bridge erecting machine, which solves the problems of the traditional bridge erecting machine in construction, such as the inability to adapt to different transverse and longitudinal slopes and special bridge surfaces with pre-arches, and improves the construction speed of composite beam bridge.

[0005] The technical problem to be solved by the present application is solved by the following technical scheme:

[0006] A self-balancing bridge erecting machine comprises two parallel main beams, a sub-beam is slidably erected at the front end of the main beam, the two main beams are connected through a cross beam, the bottom of the main beam is provided with a rear leg, a middle support and a front leg in sequence along the direction of travel, the front end of the bottom of the sub-beam is provided with a sub-leg, the rear leg, the middle support, the front leg and the sub-leg are all telescopic structures controlled by hydraulic jacks, the lengths of the rear leg, the middle support, the front leg and the sub-leg are adjusted to adapt to different transverse and longitudinal slopes and special bridge surfaces with pre-arches, the front leg, the middle support and the rear leg are all provided with a hanger wheel mechanism, the hanger wheel mechanism is used to support the main beam to travel in the construction direction, and the bottom of the front leg, the middle support and the rear leg is provided with a transverse moving mechanism.

[0007] The present application is further provided as follows: the bridge erecting machine further comprises a main beam track and two groups of trolleys, the main beam track is arranged on the top of the main beam, the trolleys move along the main beam track, and the main beam passes through the hole by applying a counterforce driving force through the reverse walking of the trolleys.

[0008] The invention is further provided with: the bottom of the crown block is connected with a lifting frame for lifting prefabricated bridge deck through a sling, the lifting frame comprises a mounting frame, a movable pulley block arranged on the top of the mounting frame, the top of the mounting frame is fixedly connected with a mounting shell with an open top, two groups of movable pulley blocks are arranged side by side in the mounting shell, the movable pulley block comprises a fixed shaft fixedly connected in the mounting shell, a guide wheel rotatably connected to the fixed shaft, a first partition plate is arranged between the two groups of movable pulley blocks in the mounting shell, and a second partition plate is arranged between the guide wheels of each group of movable pulley blocks.

[0009] A damping member is arranged between the guide wheel and the fixed shaft, the fixed shaft is hollow and filled with damping liquid inside, the damping member comprises a connecting ring groove arranged on the fixed shaft and extending circumferentially, a connecting ring plate rotatably connected in the connecting ring groove, a connecting column fixedly connected to the guide wheel and extending to the inside of the fixed shaft through the connecting ring plate in the radial direction, and a flow resistance plate fixedly connected to the end of the connecting column and located in the inside of the fixed shaft.

[0010] The invention is further provided with: the guide wheel comprises a rotating disc rotatably connected to the fixed shaft through a bearing, a support ring fixedly connected to one end face of the rotating disc and close to the outer edge, and a V-shaped groove opened in the outer peripheral wall of the support ring, a plurality of triangular ribs are arranged between the inner peripheral wall of the support ring and the rotating disc and are uniformly distributed circumferentially around the rotating disc, the damping member comprises an ear plate fixedly connected to the end face of the rotating disc, the connecting column is connected to the ear plate, sealing ring grooves are opened on both sides of the inner wall of the connecting ring groove, and sealing connecting rings rotatably connected in the sealing ring grooves are fixedly connected to both ends of the connecting ring plate, and rotating seals are arranged between the sealing connecting rings and the sealing ring grooves.

[0011] The invention is further provided with: the connecting column is threadedly connected to the connecting ring plate, the flow resistance plate is slidably connected with a sliding block close to the end face of the connecting column, the end of the connecting column is rotatably connected to the sliding block, a fixed column is arranged on the inner wall of the connecting ring plate corresponding to the flow resistance plate, and the end of the flow resistance plate is hingedly connected to the fixed column.

[0012] The invention is further provided with: one end of the fixed shaft is provided with a sliding piston, an abutting spring is arranged between the sliding piston and one end of the inner wall of the fixed shaft, and a pressure gauge is arranged on the sliding piston.

[0013] The invention is further provided with: each group of movable pulley blocks is provided with a brake mechanism on one side;

[0014] The braking mechanism includes several connecting rods hinged to the opening end of the mounting shell and located on one side of the guide wheel, a U-shaped groove opened at one end of the connecting rod, a support shaft fixedly connected to the inner side of the U-shaped groove, an abutment wheel rotatably connected to the support shaft and corresponding to the guide wheel, an elastic telescopic rod disposed at the bottom of the connecting rod, and a brake rod hinged to the elastic telescopic rod.

[0015] The edges of the abutting wheel and the corresponding guide wheel coincide in the vertical projection. One end of the elastic telescopic rod is hinged to the bottom of the side wall of the mounting housing and the other end is hinged to the connecting rod. The brake rods are arranged one-to-one between two adjacent elastic telescopic rods. One end of the brake rod is hinged to the side wall of the mounting housing below the axis of the guide wheel. The brake rods are provided with drive grooves extending along their length on both sides. The side wall of the elastic telescopic rod is provided with drive columns extending into the drive grooves. The other ends of several brake rods are fixedly connected to a brake plate. The brake plate has friction grooves corresponding to the slings on the side near the guide wheel.

[0016] The present invention is further configured such that: a groove is provided on the side wall of the mounting shell corresponding to the brake rod; a first support plate is fixedly connected to both sides of the brake rod in the groove; a second support plate is fixedly connected to the side of the elastic telescopic rod near the guide wheel; the end of the brake rod is hinged between the two first support plates; and the drive column is fixedly connected to the second support plate.

[0017] The present invention is further configured such that: the brake lever includes a fixed sleeve and an extension rod slidably inserted into the fixed sleeve; a piston block is provided on one side of the extension rod located inside the fixed sleeve; an air exchange port is provided at the end of the fixed sleeve away from the guide wheel; and a support spring is provided between the piston block and the fixed sleeve.

[0018] The ventilation port has a flow exchange hole that communicates with the fixed sleeve. The flow exchange hole is elliptical with a larger diameter in the middle and smaller diameters at both ends. A flow-blocking ball is provided inside the flow exchange hole. A venting groove is provided on the periphery of the end of the flow exchange hole away from the fixed sleeve.

[0019] The beneficial effects of this invention are:

[0020] 1. By setting the rear leg, the middle support, the front leg and the auxiliary leg adopt the telescopic structure controlled by the hydraulic jack, each supporting part is independently adjusted, the bridge deck transverse and longitudinal slope and the pre-camber parameters are monitored and fed back to the control system, the telescopic length of each leg is dynamically adjusted, when the bridge deck has a transverse slope, one side leg is elongated to compensate for the height difference; when the longitudinal slope changes, the front leg and the rear leg are coordinated to extend and retract, keeping the main beam horizontal, through the extension and retraction of each supporting part, the bridge erecting machine can adapt to complex terrain in real time, ensuring that the main beam is always in a stable state, avoiding equipment tilting or uneven load caused by uneven bridge deck, and significantly improving construction precision and safety;

[0021] 2. A damping member is arranged between the guide wheel of the movable pulley block and the fixed shaft, and the fixed shaft is filled with damping liquid. When the guide wheel rotates, the flow resistance plate is driven to move in the damping liquid through the connecting column, the inclination angle of the flow resistance plate determines the contact area with the damping liquid, thereby generating fluid resistance, when the guide wheel rotates due to hoisting vibration, the damping liquid absorbs kinetic energy through the shearing action of the flow resistance plate, inhibits the non-steady rotation of the guide wheel, the viscous resistance of the damping liquid and the dynamic adjustment function of the flow resistance plate effectively attenuate the vibration caused by the bridge deck swing or external impact during hoisting, ensuring the stability of the hoisting process and reducing the risk of sling wear;

[0022] 3. The connecting column is threadedly connected to the connecting ring plate, and the rotation of the connecting column can change the inclination angle of the flow resistance plate in the fixed shaft. When the inclination angle of the flow resistance plate increases, the contact area with the damping liquid increases, and the rotation resistance of the guide wheel increases; on the contrary, the resistance decreases. This adjustment process can be achieved manually to adapt to the damping needs under different hoisting conditions. By adjusting the angle of the flow resistance plate in real time, the damping characteristics of the movable pulley block are optimized, which can not only enhance the stability under heavy load, but also reduce energy consumption under light load, and improve the system energy efficiency ratio;

[0023] 4. By setting the brake mechanism, after one side sling is broken, the tension originally transmitted by the sling suddenly disappears, the movable pulley block changes its motion state due to the loss of balance, at this time, if the broken sling still contacts with the guide wheel, it may slide in the V-shaped groove due to inertia or residual tension, causing sliding friction between the sling and the guide wheel. Due to the increasing relative speed between the sling and the movable pulley block, the sling is wound around the abutting wheel, the abutting wheel is turned down under the action of the sling transverse force, and overcomes the elastic support force of the elastic expansion rod on the connecting rod, drives the connecting rod to rotate around the hinge point, the elastic expansion rod contracts and drives the brake rod to move towards the sling, the brake plate at the end of the brake rod contacts with the sling through the friction groove, the brake rod turns upward, further increases the pressure between the brake plate and the sling, increases the pressure between the sling and the guide wheel, and finally the guide wheel stops rotating, the sliding friction between the sling and the guide wheel stops;

[0024] 5. The utility model discloses a brake rod is set to telescopic pole body, and adds the air exchange interface to the fixed sleeve tail end, and the brake rod is composed of fixed sleeve and extension pole, is equipped with support spring and piston block in the inside, when the brake plate contacts the sling, the extension pole is compressed and retracts, the piston block compresses the spring and extrudes the gas in the sleeve, and the flow resistance ball in the commutation hole moves under the action of the airflow, and the gas flow rate is limited, the brake rod retraction speed is controlled, makes the pressure that the brake plate exerts to the sling gradually increases, that is, the gradually increasing acceleration that the movable pulley set receives, avoids the impact that the direct brake makes the precast bridge deck that hoists to the sling produces, causes the sling secondary fracture condition. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is the schematic diagram of the bridge girder erection machine of the utility model in the hole construction state.

[0026] Figure 2 It is the schematic diagram of the front support leg of the utility model in the bridge girder erection machine.

[0027] Figure 3 It is the structural schematic diagram of the hanger part of the utility model.

[0028] Figure 4 It is the local enlarged view of A part in the utility model. Figure 3

[0029] Figure 5 It is the sectional view of the fixed shaft part in the utility model.

[0030] Figure 6 It is the sectional view of the damping part in the utility model.

[0031] Figure 7 It is the structural schematic diagram of the brake mechanism and the guide wheel cooperation in the utility model.

[0032] Figure 8 It is the sectional view of the elastic telescopic rod part in the utility model.

[0033] Figure 9 It is the sectional view of the brake rod part in the utility model.

[0034] ​In the figure: 1, auxiliary leg; 2, front leg; 3, middle support; 4, rear leg; 5, auxiliary beam; 6, main beam; 7, main beam track; 8, hanger wheel mechanism; 9, transverse movement mechanism; 10, rear trolley; 11, front trolley; 12, hanger; 13, mounting frame; 14, movable pulley block; 15, mounting shell; 16, fixed shaft; 17, guide wheel; 18, first partition plate; 19, second partition plate; 20, damping member; 21, connecting ring groove; 22, connecting ring plate; 23, connecting column; 24, spoiler; 25, sliding block; 26, axial limit; 27, fixed column; 28, rotating disc; 29, support ring; 30, V-shaped groove; 31, triangular rib; 32, ear plate; 33, locking nut; 34, sealing ring groove; 35, sealing connecting ring; 36, rotating seal; 37, sliding piston; 38, abutting spring; 39, pressure gauge; 40, brake mechanism; 41, connecting rod; 42, U-shaped groove; 43, support shaft; 44, abutting wheel; 45, elastic telescopic rod; 46, brake rod; 48, driving groove; 49, driving column; 50, brake plate; 51, friction groove; 52, recess; 53, first support plate; 54, second support plate; 55, fixed sleeve; 56, extension rod; 57, piston block; 58, air exchange interface; 59, support spring; 60, flow conversion hole; 61, flow resistance ball; 62, air release groove. DETAILED DESCRIPTION

[0035] In order to make the technical means, creative features, purposes and effects of the present application easy to understand, the present application is further described below in combination with specific drawings.

[0036] As shown in Figure 1 and Figure 2 , a self-balancing bridge erecting machine comprises two parallel main beams 6, an auxiliary beam 5 is slidably arranged at the front end of the main beams 6, the two main beams 6 are connected by a cross beam (not shown in the figure), the connection part of the main beams 6 adopts pin shaft and flange connection, and the bottom of each main beam 6 is sequentially provided with a rear leg 4, a middle support 3 and a front leg 2 along the direction of travel, the bottom of the front end of the auxiliary beam 5 is provided with an auxiliary leg 1, and the auxiliary leg 1 and the front leg 2 form a working area.

[0037] The rear leg 4, the middle support 3, the front leg 2 and the auxiliary leg 1 are all telescopic structures controlled by hydraulic jacks. The telescopic structures of the rear leg 4, the middle support 3, the front leg 2 and the auxiliary leg 1 are all controlled by hydraulic jacks. Each support part is independently adjusted. The bridge deck transverse and longitudinal slopes and the pre-camber parameters are monitored and fed back to the control system to dynamically adjust the telescopic length of each leg. When the bridge deck has a transverse slope, one side leg is elongated to compensate for the height difference. When the longitudinal slope changes, the front leg 2 and the rear leg 4 are telescoped cooperatively to keep the main beam 6 horizontal. Through the telescoping of each support part, the bridge erecting machine can adapt to complex terrain in real time, ensure that the main beam 6 is always in a stable state, avoid equipment tilting or uneven load caused by uneven bridge deck, and significantly improve construction accuracy and safety.

[0038] The front leg 2, the middle support 3 and the rear leg 4 are all provided with a wheel hanger mechanism 8 for supporting the main beam 6 to travel in the construction direction. The bottom of the front leg 2, the middle support 3 and the rear leg 4 is provided with a transverse moving mechanism 9. The transverse moving mechanism 9 is a combination of a supporting wheel and a transverse moving track, which can move the whole bridge erecting machine left and right to the position of the precast bridge deck panel to be installed.

[0039] The bridge erecting machine further comprises a main beam 6 track and two groups of trolleys. The two groups of trolleys are a front trolley 11 and a rear trolley 10 arranged along the traveling direction of the main beam 6. The main beam 6 track is arranged on the top of the main beam 6. The front trolley 11 and the rear trolley 10 move along the main beam 6 track and drive the main beam 6 to pass through the hole by applying a counterforce through reverse walking of the trolley.

[0040] As shown in Figures 3-9 The bottom of the trolley is connected with a lifting frame 12 for lifting the precast bridge deck panel through a sling. The lifting frame 12 comprises a mounting frame 13 and a dynamic pulley set 14 arranged on the top of the mounting frame 13. The top of the mounting frame 13 is fixedly connected with a mounting shell 15 with an open top. The dynamic pulley set 14 is arranged in parallel in the mounting shell 15.

[0041] The dynamic pulley set 14 comprises a fixed shaft 16 fixedly connected in the mounting shell 15 and a guide wheel 17 rotatably connected with the fixed shaft 16. A first partition plate 18 is arranged between the two groups of dynamic pulley sets 14 in the mounting shell 15. A second partition plate 19 is arranged between the guide wheels 17 of each group of dynamic pulley sets 14.

[0042] In order to improve the stability of the trolley during lifting, a damping member 20 is arranged between the guide wheel 17 and the fixed shaft 16. The fixed shaft 16 is hollow and filled with damping liquid inside. The damping member 20 comprises a connecting ring groove 21 arranged on the fixed shaft 16 and extending circumferentially, a connecting ring plate 22 rotatably connected in the connecting ring groove 21, a connecting column 23 fixedly connected with the guide wheel 17 and extending to the inside of the fixed shaft 16 in the radial direction through the connecting ring plate 22, and a flow resistance plate 24 fixedly connected with the end of the connecting column 23 and located in the inside of the fixed shaft 16.

[0043] By setting the damping member 20 between the guide pulley 17 and the fixed shaft 16 of the movable pulley block 14, the fixed shaft 16 is filled with damping liquid. When the guide pulley 17 rotates, the flow plate 24 is driven to move in the damping liquid through the connecting column 23, and the inclination angle of the flow plate 24 determines the contact area with the damping liquid, thereby generating fluid resistance. When the guide pulley 17 rotates due to hoisting vibration, the damping liquid absorbs kinetic energy through the shearing action of the flow plate 24, thereby inhibiting the unstable rotation of the guide pulley 17. The viscous resistance of the damping liquid and the dynamic adjustment function of the flow plate 24 effectively attenuate the vibration caused by the swing of the bridge deck or external impact during hoisting, thereby ensuring the stability of the hoisting process and reducing the risk of sling wear.

[0044] In order to facilitate the adjustment of the damping size of the damping member 20, the connecting column 23 is threadedly connected to the connecting ring plate 22, the end face of the flow plate 24 close to the connecting column 23 is slidingly connected with a sliding block 25, the end of the connecting column 23 is rotatably connected to the sliding block 25, and an axial limiting 26 is arranged between the connecting column 23 and the sliding block 25. The inner wall of the connecting ring plate 22 is provided with a fixed column 27 corresponding to the flow plate 24, and the end of the flow plate 24 is hingedly connected to the fixed column 27.

[0045] By threadedly connecting the connecting column 23 to the connecting ring plate 22, rotating the connecting column 23 can change the inclination angle of the flow plate 24 in the fixed shaft 16. When the inclination angle of the flow plate 24 increases, the contact area with the damping liquid increases, and the rotational resistance of the guide pulley 17 increases; otherwise, the resistance decreases. This adjustment process can be achieved manually to adapt to the damping needs under different hoisting conditions. By adjusting the angle of the flow plate 24 in real time, the damping characteristics of the movable pulley block 14 can be optimized, which can not only enhance the stability under heavy load, but also reduce energy consumption under light load, thereby improving the energy efficiency ratio of the system.

[0046] The guide pulley 17 includes a rotating disc 28 rotatably connected to the fixed shaft 16 by a bearing, a support ring 29 fixedly connected to one end face of the rotating disc 28 and close to the outer edge, and a V-shaped groove 30 opened in the outer peripheral wall of the support ring 29. A plurality of triangular ribs 31 are arranged around the rotating disc 28 and are uniformly distributed in the circumferential direction of the rotating disc 28 between the inner peripheral wall of the support ring 29 and the rotating disc 28. The damping member 20 includes an ear plate 32 fixedly connected to the end face of the rotating disc 28, and the connecting column 23 is arranged in the ear plate 32 and is provided with a locking nut 33 on the upper and lower sides of the ear plate 32. The inner wall of the connecting ring groove 21 is provided with a sealing ring groove 34 on both sides, and the connecting ring plate 22 is fixedly connected with a sealing connecting ring 35 rotatably connected in the sealing ring groove 34 at both ends. A rotary seal 36 is arranged between the sealing connecting ring 35 and the sealing ring groove 34, and the rotary seal 36 is preferably a sealing ring.

[0047] The fixed shaft 16 is provided with a sliding piston 37 at one end, and an abutting spring 38 is arranged between the sliding piston 37 and the inner wall of the fixed shaft 16 at one end. A pressure gauge 39 is arranged through the sliding piston 37, so as to detect the damping liquid pressure in the fixed shaft 16 and supplement the damping liquid in time. The damping liquid is preferably high-viscosity damping oil.

[0048] In order to improve the safety of the hoisting of the head sheave, a brake mechanism 40 is arranged on one side of each group of movable pulley sets 14. The brake mechanism 40 comprises a plurality of connecting rods 41 hinged to the opening end of the mounting shell 15 and located on one side of the guide wheel 17, a U-shaped groove 42 arranged at one end of the connecting rod 41, a support shaft 43 fixedly connected to the inner side of the U-shaped groove 42, an abutting wheel 44 rotationally connected to the support shaft 43 and corresponding to the guide wheel 17, an elastic expansion rod 45 arranged at the bottom of the connecting rod 41, and a brake rod 46 hinged to the elastic expansion rod 45.

[0049] The edges of the abutting wheel 44 and the corresponding guide wheel 17 coincide in the vertical direction. One end of the elastic expansion rod 45 is hinged to the bottom of the side wall of the mounting shell 15, and the other end is hinged to the connecting rod 41. The brake rod 46 is arranged between the adjacent two elastic expansion rods 45. One end of the brake rod 46 is hinged to the position below the axis of the guide wheel 17 on the side wall of the mounting shell 15. Drive grooves 48 are arranged on both sides of the brake rod 46 along the length direction of the brake rod 46. Drive columns 49 are arranged on the side wall of the elastic expansion rod 45 and extend into the drive grooves 48. The other ends of the brake rods 46 are fixedly connected to a brake plate 50. A friction groove 51 corresponding to the sling is arranged on the side of the brake plate 50 close to the guide wheel 17.

[0050] When the brake mechanism 40 is arranged, after the sling on one side breaks, the tension originally transmitted by the sling disappears suddenly, and the movable pulley set 14 changes its motion state due to the loss of balance. At this time, if the broken sling still contacts the guide wheel 17, it may slide in the V-shaped groove 30 due to inertia or residual tension, resulting in sliding friction between the sling and the guide wheel 17. Since the relative speed between the sling and the movable pulley set 14 increases, the abutting wheel 44 is turned downward under the action of the transverse force of the sling, overcomes the elastic support force of the elastic expansion rod 45 on the connecting rod 41, pushes the connecting rod 41 to rotate around the hinge point, and drives the brake rod 46 to move towards the sling. The brake plate 50 at the end of the brake rod 46 contacts the sling through the friction groove 51, so that the brake rod 46 is turned upward, further increasing the pressure between the brake plate 50 and the sling, and increasing the pressure between the sling and the guide wheel 17. Finally, the guide wheel 17 stops rotating, and the sliding friction between the sling and the guide wheel 17 stops.

[0051] The side wall of the mounting shell 15 is provided with a groove 52 corresponding to the brake lever 46, and the first support plates 53 are fixedly connected to both sides of the groove 52 corresponding to the brake lever 46. The second support plates 54 are fixedly connected to one side of the elastic extension rods 45 close to the guide wheels 17. The end of the brake lever 46 is hingedly connected between the two first support plates 53, and the driving column 49 is fixedly connected to the second support plate 54.

[0052] The brake lever 46 comprises a fixed sleeve 55 and an extension rod 56 which is slidingly inserted into the fixed sleeve 55. The extension rod 56 is provided with a piston block 57 on one side in the fixed sleeve 55. The fixed sleeve 55 is provided with an air exchange interface 58 at the end away from the guide wheels 17. The support spring 59 is arranged between the piston block 57 and the fixed sleeve 55.

[0053] The air exchange interface 58 is provided with an air exchange hole 60 which is communicated with the fixed sleeve 55. The air exchange hole 60 is in the shape of an ellipse with a large diameter in the middle and small diameters at both ends. The air exchange hole 60 is provided with a flow resistance ball 61. The air exchange hole 60 is provided with a gas discharge groove 62 at the end away from the fixed sleeve 55.

[0054] By arranging the brake lever 46 as an elastic rod body, and adding the air exchange interface 58 at the tail end of the fixed sleeve 55, the brake lever 46 is composed of the fixed sleeve 55 and the extension rod 56. The support spring 59 and the piston block 57 are arranged inside. When the brake plate 50 contacts the sling, the extension rod 56 is compressed under pressure, the piston block 57 compresses the spring and squeezes the gas in the sleeve. The flow resistance ball 61 in the air exchange hole 60 moves under the action of the airflow, limits the gas flow rate, controls the contraction speed of the brake lever 46, and gradually increases the pressure applied by the brake plate 50 to the sling, that is, the acceleration received by the movable pulley set 14 gradually increases, avoiding the impact of directly braking the precast bridge deck on the sling, causing the sling to be broken again.

[0055] The implementation principle of the present application is:

[0056] The present application independently adjusts the height of the rear legs 4, the middle supports 3, the front legs 2 and the auxiliary legs 1 through hydraulic control, real-time adapts to the changes of the bridge deck transverse and longitudinal slopes and the pre-camber, and ensures the horizontal stability of the main girder 6. The movable pulley set 14 adopts a damping liquid combined with a flow resistance plate 24 damping system, optimizes the damping force by adjusting the inclination angle of the flow resistance plate 24, effectively suppresses the hoisting vibration and reduces the energy consumption. The brake mechanism 40 is linked with the elastic extension rods 45 and the elastic brake lever 46 through the abutting wheels 44, and locks the guide wheels 17 with a progressive friction pressure when the sling is broken, avoiding the impact leading to secondary accidents.

[0057] The above shows and describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited to the above-mentioned embodiments, and various changes and improvements can be made to the present application without departing from the spirit and scope of the present application, and such changes and improvements all fall within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A self-balancing bridge erecting machine, characterized in that: It includes two parallel main beams (6), with a secondary beam (5) slidably mounted on the front end of each main beam (6). The two main beams (6) are connected by a crossbeam. Each main beam (6) has a rear support leg (4), a middle support (3), and a front support leg (2) sequentially arranged at its bottom along the direction of travel. The secondary beam (5) has a secondary support leg (1) at its front end. The rear support leg (4), middle support (3), front support leg (2), and secondary support leg (1) are all telescopic structures controlled by hydraulic jacks. The lengths of each of the rear support leg (4), middle support (3), front support leg (2), and auxiliary support leg (1) are adjusted to adapt to bridge decks with different transverse and longitudinal slopes and pre-camber. Each of the front support leg (2), middle support leg (3), and rear support leg (4) is equipped with a wheel-hanging mechanism (8). The wheel-hanging mechanism (8) is used to support the main beam (6) as it moves along the construction direction. Each of the front support leg (2), middle support leg (3), and rear support leg (4) has a transverse movement mechanism (9) at its bottom. The bridge erecting machine also includes a main beam (6) track and two... A crane is assembled, with the main beam (6) track set on the top of the main beam (6). The crane moves along the main beam (6) track and applies a reaction force by moving in the opposite direction to drive the main beam (6) through the hole. The bottom of the crane is connected to a sling for hoisting the precast bridge deck via a sling. The sling (12) includes a mounting frame (13) and a movable pulley group (14) set on the top of the mounting frame (13). The top of the mounting frame (13) is fixedly connected to a top that is open. The mounting housing (15) has two sets of movable pulley groups (14) arranged side by side inside the mounting housing (15). Each movable pulley group (14) includes a fixed shaft (16) fixedly connected to the mounting housing (15) and a guide wheel (17) rotatably connected to the fixed shaft (16). A first partition (18) is provided between the two sets of movable pulley groups (14) inside the mounting housing (15). A second partition (19) is provided between the guide wheels (17) of each set of movable pulley groups (14). A damping element (20) is provided between the guide wheel (17) and the fixed shaft (16). The fixed shaft (16) is hollow and filled with damping fluid. The damping element (20) includes a connecting ring groove (21) disposed on the fixed shaft (16) and extending circumferentially therein, a connecting ring plate (22) rotatably connected to the connecting ring groove (21), and a component fixedly connected to the guide wheel (17), passing radially through the connecting ring plate (22) and extending into the interior of the fixed shaft (16). The guide wheel (17) includes a connecting post (23), a flow-blocking plate (24) fixedly connected to the end of the connecting post (23) and located inside the fixed shaft (16), a rotating disk (28) rotatably connected to the fixed shaft (16) via a bearing, a support ring (29) fixedly connected to one end face of the rotating disk (28) and close to its outer edge, and a V-groove (30) formed on the outer peripheral wall of the support ring (29). A groove is provided between the inner peripheral wall of the support ring (29) and the rotating disk (28). A plurality of triangular ribs (31) are evenly distributed around the circumference of the rotating disk (28). The damping element (20) includes an ear plate (32) fixedly connected to the end face of the rotating disk (28). The connecting post (23) is connected to the ear plate (32). Sealing ring grooves (34) are provided on both sides of the inner wall of the connecting ring groove (21). Sealing connecting rings (35) are rotatably connected to both ends of the connecting ring plate (22) and are respectively fixedly connected to the sealing ring grooves (34). A rotating seal (36) is provided between the sealing ring groove (34) and the connecting post (23). The connecting post (23) is threadedly connected to the connecting ring plate (22). The flow-blocking plate (24) is slidably connected to the end face of the connecting post (23) with a slider (25). The end of the connecting post (23) is rotatably connected to the slider (25). The inner wall of the connecting ring plate (22) is provided with a fixing post (27) corresponding to the flow-blocking plate (24). The end of the flow-blocking plate (24) is hinged to the fixing post (27).

2. The self-balancing bridge erecting machine according to claim 1, characterized in that: A sliding piston (37) is provided at one end of the fixed shaft (16), and an abutment spring (38) is provided between the sliding piston (37) and one end of the inner wall of the fixed shaft (16). A pressure gauge (39) is provided on the sliding piston (37).

3. The self-balancing bridge erecting machine according to claim 1, characterized in that: Each of the movable pulley groups (14) is equipped with a braking mechanism (40) on one side; The braking mechanism (40) includes a plurality of connecting rods (41) hinged to the opening end of the mounting housing (15) and located on one side of the guide wheel (17), a U-shaped groove (42) opened at one end of the connecting rod (41), a support shaft (43) fixedly connected to the inside of the U-shaped groove (42), an abutment wheel (44) rotatably connected to the support shaft (43) and corresponding to the guide wheel (17), an elastic telescopic rod (45) provided at the bottom of the connecting rod (41), and a brake rod (46) hinged to the elastic telescopic rod (45); The edges of the abutting wheel (44) and the corresponding guide wheel (17) overlap in the vertical projection. One end of the elastic telescopic rod (45) is hinged to the bottom of the side wall of the mounting shell (15) and the other end is hinged to the connecting rod (41). The brake rods (46) are arranged one-to-one between two adjacent elastic telescopic rods (45). One end of the brake rod (46) is hinged to the side wall of the mounting shell (15) at a position below the axis of the guide wheel (17). The brake rods (46) are provided with drive grooves (48) extending along their length on both sides. The side wall of the elastic telescopic rod (45) is provided with drive columns (49) extending into the drive grooves (48). The other ends of several brake rods (46) are fixedly connected to a brake plate (50). The brake plate (50) has a friction groove (51) corresponding to the sling on the side near the guide wheel (17).

4. A self-balancing bridge erecting machine according to claim 3, characterized in that: The mounting housing (15) has a groove (52) on its side wall corresponding to the brake rod (46). A first support plate (53) is fixedly connected to both sides of the brake rod (46) in the groove (52). A second support plate (54) is fixedly connected to the side of the elastic telescopic rod (45) near the guide wheel (17). The end of the brake rod (46) is hinged between the two first support plates (53), and the drive column (49) is fixedly connected to the second support plate (54).

5. A self-balancing bridge erecting machine according to claim 4, characterized in that: The brake lever (46) includes a fixed sleeve (55) and an extension rod (56) slidably inserted into the fixed sleeve (55). A piston block (57) is provided on one side of the extension rod (56) inside the fixed sleeve (55). An air exchange port (58) is provided at one end of the fixed sleeve (55) away from the guide wheel (17). A support spring (59) is provided between the piston block (57) and the fixed sleeve (55). The ventilation port (58) is provided with a flow exchange hole (60) that communicates with the fixed sleeve (55). The flow exchange hole (60) is elliptical with a large diameter in the middle and a small diameter at both ends. A flow-blocking ball (61) is provided in the flow exchange hole (60). A venting groove (62) is provided on the periphery of the end of the flow exchange hole (60) away from the fixed sleeve (55).

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