A precast beam bridge erecting machine

Abstract

The present invention relates to the technical field of bridge engineering, and specifically discloses a precast beam bridge erecting machine, which includes a main beam and a hoisting trolley. The hoisting trolley includes a cross beam, a hoisting mechanism, and a lifting mechanism. The lifting mechanism includes a hanging bracket installed at the lower end of the hoisting mechanism, a swing driver installed on the hanging bracket, and two sling units arranged relatively left and right on the hanging bracket. Each sling unit includes a sling with its upper end installed on the hanging bracket and connected to the swing driver, a docking head arranged at the lower end of the sling, and an electromagnet movably assembled in the docking head. One of the sling units further includes a locking hook rotatably installed on the docking head, a torsion spring connected between the docking head and the locking hook, a limiting member arranged on the locking hook, and an unlocking member arranged on the docking head. The other sling unit further includes a locking pin arranged on the docking head. This precast beam bridge erecting machine improves the construction efficiency and reduces the safety risk.

Description

Technical Field

[0001] The invention relates to the technical field of bridge engineering, and in particular to a prefabricated beam bridge erecting machine. Background Art

[0002] The traditional on-site pouring method is time-consuming and difficult to meet the needs of rapid construction. Prefabrication and assembly technology is widely used in bridge construction due to its advantages such as fast construction speed, high prefabrication quality and environmental friendliness. Prefabricated beam bridge erecting machine is a kind of lifting equipment specially used for bridge construction, mainly used for hoisting and erecting prefabricated beams or box beams.

[0003] The prefabricated beam bridge-erecting machine in the prior art, such as a bridge-erecting machine and a transport trolley disclosed in a Chinese patent document with authorization announcement number CN118223420B, is provided with a pushing mechanism to directly deliver the connecting plate into the prefabricated beam box, and can align the threaded connecting hole on the connecting plate with the lifting hole on the prefabricated beam box through the L-shaped clamping rod, and the connecting screw and the connecting plate can be tightened during the lowering process of the lifting box, so that the prefabricated beam box can be quickly lifted; during the transportation of the prefabricated beam box, the prefabricated beam box is fitted with the U-shaped plate, and the U-shaped plate is fitted with the beam transport vehicle, and when passing through uneven ground, the prefabricated beam box will not move at will due to the bumps of the beam transport vehicle; after the prefabricated beam box is lifted, the anti-fall ring, the L-shaped rotating rod and the anti-fall plate are used for double protection to prevent the connecting shaft from detaching from the lifting box, thereby improving the safety during the construction process.

[0004] However, before the above-mentioned bridge-building machine and its transport trolley in the prior art lift the precast beam box, the staff need to manually open the L-shaped clamping rod, install the connecting plate on the beam transport vehicle, and then slide the fixed support plate into the precast beam box to align the threaded holes on the connecting plate with the lifting holes on the precast beam box. Only then can the lifting box be connected to the precast beam box through the automatic rotation mechanism. The operation steps are cumbersome, the construction efficiency is low, and the staff need to frequently operate between the bridge-building machine and the beam transport vehicle, which poses a high safety risk. Summary of the invention

[0005] The present invention provides a prefabricated beam bridge erecting machine, aiming to solve the problems of low construction efficiency and high safety risk of the bridge erecting machine and its transport trolley in the related art.

[0006] The present invention provides a prefabricated beam bridge erecting machine adopts the following technical solution:

[0007] A prefabricated beam bridge erecting machine, comprising a main beam extending forward and backward, a lifting trolley mounted on the main beam for forward and backward movement, the lifting trolley comprising a cross beam extending left and right, a lifting mechanism mounted on the cross beam for left and right movement, a hoisting mechanism arranged at the lower end of the lifting mechanism, the lifting mechanism comprising a hanger mounted at the lower end of the lifting mechanism, a swing driver mounted on the hanger, and two hanger units arranged on the hanger opposite to each other left and right; each hanger unit comprises a sling with an upper end mounted on the hanger and connected to the swing driver, a butt joint arranged at the lower end of the sling, and an electromagnet mounted in the butt joint for movement along the length direction of the sling, one of the hanger units further comprises a locking hook rotatably mounted on the butt joint, a torsion spring connected between the butt joint and the locking hook, a limiting member arranged on the locking hook for limiting the rotation of the locking hook, an unlocking member arranged on the butt joint for pushing the limiting member to allow the locking hook to rotate, and the other hanger unit further comprises a locking pin arranged on the butt joint;

[0008] The swing drive is used to drive the two slings to swing inward synchronously, so that the two slings are wrapped around the outside of the precast beam and the two butt joints are close to each other at the bottom of the precast beam. The two electromagnets are used to start when the two butt joints are close to each other to attract each other, so that the end faces of the two butt joints are butted and trigger the unlocking member to push the limit member, so that the locking hook is driven by the elastic force of the torsion spring to rotate to cooperate with the locking pin, thereby realizing mutual locking between the two sling units.

[0009] By adopting the above technical solution, the two slings are driven to swing synchronously through the swing drive, and the two butt joints are docked and locked using the electromagnet, locking hook and locking pin, so that the two sling units can bypass the bottom of the precast beam and complete the connection, so that the lifting trolley can efficiently and safely lift the precast beam onto the bridge pier, which greatly simplifies the operating steps and improves the construction efficiency. The staff does not need to frequently operate between the bridge erection machine and the beam transport vehicle, reducing the safety risks caused by personnel activities.

[0010] Furthermore, the locking hook includes a rotating part rotatably installed on the docking head, a rotating gear coaxially arranged with the rotating part, and a hook body fixed on the rotating part; a reset spring is arranged between each electromagnet and the docking head, and the reset spring is used to apply elastic force to the electromagnet so that the two electromagnets move away from each other, and a force storage rack is fixed on the electromagnet corresponding to the locking hook, and the tooth portion of the force storage rack is a one-way tooth, which is used to drive the rotating gear to rotate when the two electromagnets move away from each other, so that the locking hook rotates to disengage from the locking pin.

[0011] Furthermore, the locking pin comprises a pin body fixed on the docking head for hooking the locking hook, and an anti-drop cap fixed on the end of the pin body away from the docking head for preventing the locking hook from being detached from the pin body.

[0012] Adopting the above technical solution can effectively prevent the locking hook from disengaging from the pin body, avoid locking failure caused by external force impact or vibration, and ensure the safety of the hoisting operation.

[0013] Further, a receiving groove for installing a limiting member is formed on the side wall of the rotating gear facing the docking head. The limiting member includes a limiting block and a first spring connected between the receiving groove and the limiting block. A limiting groove is formed on the side wall of the docking head facing the rotating gear. The first spring is used to apply an elastic force to the limiting block so that the limiting block extends into the limiting groove.

[0014] Further, the unlocking member is installed in the limiting groove. The unlocking member includes an unlocking rod and a second spring connected between the unlocking rod and the limiting groove. The unlocking rod has a protruding head that can be pushed by an electromagnet and a tail for pushing the limiting block into the receiving groove. The second spring is used to apply an elastic force to the unlocking rod so that the unlocking rod moves in the direction close to the electromagnet.

[0015] Further, each sling includes a housing and a sling provided in the housing. The housing is flat and extends in the front-rear direction of the width direction of the housing.

[0016] Adopting the above technical solution is beneficial to controlling the swinging direction of the sling, enabling the docking heads at the lower end of the sling to approach each other more accurately and complete docking, and at the same time forming a stable support on the outside of the precast beam.

[0017] Further, an elastic bending portion is provided in the length direction of the housing. The elastic bending portion is made of a shape memory alloy material.

[0018] Adopting the above technical solution, the elastic bending portion can undergo elastic deformation at the corner of the precast beam to closely adhere to the cross-sectional shape of the precast beam, thereby ensuring a stable and highly adaptable support provided by the sling on the outside of the precast beam.

[0019] Further, the swing drive includes a double-headed hydraulic cylinder installed on the hanger, a drive rack provided at the output end of the double-headed hydraulic cylinder, a rotating wheel rotatably installed on the hanger, and a drive gear provided on the rotating wheel and meshing with the drive rack. The upper end of the sling is fixed to the rotating wheel.

[0020] Further, the rotating wheel includes a wheel shaft, wheel rings provided at both ends in the length direction of the wheel shaft, and a wheel plate connected between the two wheel rings. A belt passing groove is formed on the wheel plate. The upper end of the sling is fixed to the wheel shaft and passes downward through the belt passing groove.

[0021] Further, each of the sling units further includes a friction member disposed on the docking head. The docking head is provided with an inclined groove that slopes downward from the outside to the inside. The friction member is movably assembled in the inclined groove. The upper end of the friction member has a friction surface for abutting against the precast beam, and the lower end of the friction member can be pushed by the electromagnet when the two electromagnets approach each other.

[0022] With the above technical solution, through the action of the electromagnet, the friction member can be in close contact with the bottom surface of the precast beam, thereby providing sufficient frictional force to ensure the stability of the precast beam during hoisting, prevent sliding, and enhance the safety and stability of the hoisting operation.

[0023] The beneficial effects of the precast beam bridge erecting machine provided by the present invention are as follows: By driving the two slings to swing synchronously through the swing driver, and using the electromagnet, the locking hook and the locking pin to complete the automatic docking and locking of the two docking heads, the two sling units can bypass the bottom of the precast beam and complete the connection, enabling the hoisting trolley to hoist the precast beam onto the pier efficiently and safely. This greatly simplifies the operation steps, improves the construction efficiency, and eliminates the need for workers to operate frequently between the bridge erecting machine and the beam transport vehicle, reducing the safety risks caused by personnel activities. In addition, the design that the end face of the electromagnet is flush with the end face of the docking head and the guiding function of the flat-shaped housing are conducive to ensuring the precise alignment and close fitting of the two sling units, improving the docking accuracy and reducing the docking deviation. The rapid response of the electromagnet and the automatic rotation design of the locking hook enable the connection and separation between the sling units to be more rapid, shortening the hoisting preparation and reset time. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic structural diagram of the precast beam bridge erecting machine of the present invention.

[0025] Figure 2 is a schematic structural diagram of the hoisting mechanism of the precast beam bridge erecting machine of the present invention.

[0026] Figure 3 is a schematic structural diagram of the hoisting mechanism of the precast beam bridge erecting machine of the present invention from another perspective.

[0027] Figure 4 is a schematic structural diagram of the sling of the precast beam bridge erecting machine of the present invention.

[0028] Figure 5 is a schematic structural diagram of the docking head of the precast beam bridge erecting machine of the present invention.

[0029] Figure 6 is Figure 5 an enlarged view of part A in

[0030] Figure 7 is a schematic structural diagram of the locking hook and the locking pin of the precast beam bridge erecting machine of the present invention.

[0031] Figure 8 It is a schematic structural diagram of the limiting member of the precast beam erecting machine of the present invention.

[0032] Figure 9 It is a schematic structural diagram of the swing drive of the precast beam erecting machine of the present invention.

[0033] Reference numerals:

[0034] 10, main beam; 20, hoisting trolley; 210, cross beam; 220, hoisting mechanism; 230, lifting mechanism; 30, swing drive; 310, double-headed hydraulic cylinder; 320, drive rack; 330, rotating wheel; 331, wheel axle; 332, wheel ring; 333, wheel plate; 340, drive gear; 40, sling unit; 410, sling; 411, housing; 412, suspension cable; 413, elastic bending part; 420, docking head; 421, installation cavity; 422, limiting groove; 423, docking port; 430, electromagnet; 431, return spring; 432, energy storage rack; 440, locking hook; 441, rotating part; 442, rotating gear; 443, hook body; 450, limiting member; 460, unlocking member; 461, unlocking rod; 462, second spring; 470, locking pin; 471, pin body; 472, anti-detachment cap; 480, friction member; 481, friction surface; 50, hanging bracket; 60, precast beam. Detailed implementation manners

[0035] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0036] As Figures 1 to 9 shown and with reference to the orientation shown in Figure 1 The embodiment of the precast beam erecting machine of the present invention is used to hoist the precast beam 60 carried by the beam transporter onto the pier and includes a main beam 10 and two hoisting trolleys 20. The precast beam 60 in the embodiment is a box girder, the beam cross-section is an isosceles trapezoid with a wider upper part and a narrower lower part, and there are flanges on both sides of the upper part.

[0037] As Figure 1 shown, the main beam 10 extends forward and backward in the length direction, and the two hoisting trolleys 20 are assembled to move forward and backward on the main beam 10. Each hoisting trolley 20 includes a cross beam 210 extending left and right in length, a traveling mechanism for driving the cross beam 210 to move forward and backward on the main beam 10, a hoisting mechanism 220 assembled to move left and right on the cross beam 210, and a lifting mechanism 230 provided at the lower end of the hoisting mechanism 220.

[0038] As Figures 1 to 3As shown, the hoisting mechanism 230 includes a hanger 50 installed at the lower end of the lifting mechanism 220, a swing drive 30 installed on the hanger 50, and two hanger units 40 arranged on the hanger 50 opposite to each other on the left and right sides.

[0039] like Figure 2 , Figure 3 , Figure 5 and Figure 8 As shown, each sling unit 40 includes a sling 410 whose upper end is installed on the hanger 50 and connected to the swing drive 30, a docking head 420 arranged at the lower end of the sling 410, an electromagnet 430 assembled in the docking head 420 and movable along the length direction of the sling 410, and a friction member 480 arranged on the docking head 420.

[0040] One of the hanger units 40 further includes a locking hook 440 rotatably mounted on the docking head 420, a torsion spring connected between the docking head 420 and the locking hook 440, a limiting member 450 disposed on the locking hook 440 for limiting the rotation of the locking hook 440, and an unlocking member 460 disposed on the docking head 420 for pushing the limiting member 450 to allow the locking hook 440 to rotate. The other hanger unit 40 further includes a locking pin 470 disposed on the docking head 420.

[0041] like Figure 3 and Figure 4 As shown, each sling 410 includes a shell 411 and a sling 412 arranged in the shell 411. The sling 412 is used to carry the hoisting load and is composed of multiple strands of steel wire rope or chain. The shell 411 protects and guides the sling 412. Before hoisting, the bridge erection machine is in a waiting state, and each sling 410 naturally hangs down under the action of gravity. During hoisting, the bridge erection machine enters the beam erection state, and the two slings 410 are driven by the swing drive 30 to swing inward synchronously, so that the two slings 410 are wrapped around the outside of the prefabricated beam 60, and the two docking joints 420 are close to each other at the bottom of the prefabricated beam 60.

[0042] The housing 411 is flat, and the width direction of the housing 411 extends forward and backward, and the length direction extends upward and downward. The flat design of the housing 411 limits the sling 410 to swing only in the left and right directions during the swinging process, avoiding unnecessary forward and backward shaking of the sling 410 during the swinging process, and is conducive to the docking joints 420 at the lower ends of the sling 410 to accurately approach each other to complete docking, and form a stable support on the outside of the prefabricated beam 60.

[0043] A number of elastic bending parts 413 are arranged in the length direction of the outer shell 411, and the elastic bending parts 413 are made of shape memory alloy material. In the embodiment, the elastic bending parts 413 are arranged at the flange on the upper part and the bottom corners on the lower part of the precast beam 60. When the sling 410 swings and contacts the flange on the upper part or the bottom corners on the lower part of the precast beam 60, the elastic bending parts 413 are subjected to an external force and quickly undergo elastic deformation, curling into a preset arc state to adapt to the cross-sectional shape of the precast beam 60 and attach to the outside of the precast beam 60, thereby providing stable support. After hoisting, when the bridge erecting machine enters the reset state, the elastic bending parts 413 can stretch when the sling 410 hangs down naturally and present a vertical state.

[0044] As Figure 5 and Figure 8 shown, each docking head 420 has an installation cavity 421 extending along the length direction of the sling 410, and the installation cavity 421 has a docking port 423 opened at the end face of the docking head 420. The electromagnet 430 is movably assembled in the installation cavity 421, and the electromagnet 430 has an extending part that can extend into the docking port 423. The two electromagnets 430 are used to start when the two docking heads 420 approach each other, so that the two electromagnets 430 attract each other and approach each other along the installation cavity 421, thereby driving the end faces of the two docking heads 420 to dock. Until the extending part of the electromagnet 430 extends into the docking port 423, the end face of the electromagnet 430 is flush with the end face of the docking head 420, and the end faces of the two electromagnets 430 can be closely attached, which is beneficial to ensuring that the two docking heads 420 are accurately aligned and closely attached under the attraction of the two electromagnets 430, thereby improving the accuracy and reliability of docking and reducing docking deviation. After hoisting, when the bridge erecting machine enters the reset state, the two electromagnets 430 are powered off so that the two docking heads 420 can be disconnected.

[0045] A reset spring 431 is arranged between each electromagnet 430 and the installation cavity 421. The reset spring 431 is used to be compressed when the two electromagnets 430 approach each other to store elastic potential energy, and is released after the two electromagnets 430 are powered off to apply an elastic force to the electromagnets 430, so that the two electromagnets 430 move away from each other to complete the reset.

[0046] Each docking head 420 is provided with an inclined groove that slopes downward from the outside to the inside. The friction member 480 is movably assembled in the inclined groove. The upper end of the friction member 480 has a friction surface 481 for abutting against the precast beam 60. The lower end of the friction member 480 can be pushed by the electromagnet 430 when the two electromagnets 430 approach each other, so that the friction member 480 moves upward along the inclined groove to be in close contact with the bottom surface of the precast beam 60 to provide stable friction force and prevent the precast beam 60 from sliding during hoisting.

[0047] As Figures 5 to 8As shown, the locking hook 440 includes a rotating part 441 rotatably mounted on the docking head 420, a rotating gear 442 coaxially arranged with the rotating part 441, and a hook body 443 fixed on the rotating part 441. The rotating gear 442 is provided with a receiving groove for installing the limiting member 450 on the side wall facing the docking head 420, and the limiting member 450 includes a limiting block and a first spring connected between the containing groove and the limiting block. The side wall of the docking head 420 facing the rotating gear 442 is provided with a limiting groove 422. Before hoisting, when the bridge erecting machine is in a waiting state, the limiting member 450 corresponds to the limiting groove 422, and the first spring applies an elastic force to the limiting block, so that the limiting block extends into the limiting groove 422, restricting the rotation of the locking hook 440, and locking the locking hook 440 to a rotation position disengaged from the locking pin 470, and the torsion spring between the docking head 420 and the locking hook 440 stores elastic potential energy.

[0048] The unlocking member 460 is installed in the limiting groove 422. The unlocking member 460 includes an unlocking rod 461 and a second spring 462 connected between the unlocking rod 461 and the limiting groove 422. The unlocking rod 461 has a protruding head that can be extended into the installation cavity 421 and pushed by the electromagnet 430, and a tail portion for pushing the limiting block into the receiving groove. Before hoisting, when the bridge erecting machine is in the waiting state, the second spring 462 applies elastic force to the unlocking rod 461, so that the unlocking rod 461 moves in the direction close to the electromagnet 430, and the protruding head extends into the installation cavity 421. During hoisting, the bridge erecting machine enters the beam erecting state. When the two electromagnets 430 approach each other, the electromagnet 430 pushes the unlocking rod 461, so that the unlocking rod 461 pushes the limiting member 450, so that the limiting block extends into the receiving groove, so as to allow the locking hook 440 to rotate under the drive of the elastic force of the torsion spring to cooperate with the locking pin 470, thereby realizing the mutual locking between the two hoisting device units 40.

[0049] A power storage rack 432 is fixed on the electromagnet 430 corresponding to the locking hook 440. The tooth portion of the power storage rack 432 is a one-way tooth, which is used to drive the rotating gear 442 to rotate when the two electromagnets 430 move away from each other, so that the locking hook 440 rotates to disengage from the locking pin 470, so that the two docking joints 420 are disconnected. During the rotation of the locking hook 440, the torsion spring between the docking joint 420 and the locking hook 440 accumulates power for the next hoisting.

[0050] The locking pin 470 includes a pin body 471 fixed on the docking head 420 for hooking the locking hook 440 , and an anti-drop cap 472 fixed on the end of the pin body 471 away from the docking head 420 for preventing the locking hook 440 from being separated from the pin body 471 .

[0051] like Figure 3 and Figure 9As shown in the figure, the swing drive 30 includes a double-headed hydraulic cylinder 310 mounted on the hanger 50, a drive rack 320 provided at the output end of the double-headed hydraulic cylinder 310, a rotating wheel 330 rotatably mounted on the hanger 50, and a drive gear 340 provided on the rotating wheel 330 and meshing with the drive rack 320. The rotating wheel 330 includes a wheel shaft 331, wheel rims 332 provided at both ends in the length direction of the wheel shaft 331, and a wheel plate 333 connected between the two wheel rims 332. A belt-passing groove is formed on the wheel plate 333 for guiding the swing of the sling 410. The upper end of the sling 410 is fixed on the wheel shaft 331 and passes downward through the belt-passing groove. By controlling the telescopic movement of the double-headed hydraulic cylinder 310, the rotating wheel 330 can be driven to rotate, so as to drive the sling 410 fixed thereon to swing, ensuring that the sling 410 can accurately wrap around the outside of the precast beam 60.

[0052] The working process of the embodiment of the precast beam erecting machine of the present invention includes the following steps:

[0053] First step, before hoisting, the erecting machine is in a state waiting for erection. Under the action of gravity, each sling 410 naturally hangs down. The locking hook 440 is locked by the limiting member 450 to a rotating position disengaged from the locking pin 470. The torsion spring stores elastic potential energy, and each electromagnet 430 is in a power-off state.

[0054] Second step, during hoisting, the erecting machine enters the beam erection state. The two slings 410 swing inwards synchronously under the drive of the swing drive 30. The two slings 410 wrap around the outside of the precast beam 60, and the two docking heads 420 approach each other at the bottom of the precast beam 60. The two electromagnets 430 are activated and attract each other, so that the end faces of the two docking heads 420 are docked. The electromagnet 430 pushes the unlocking rod 461, so that the unlocking rod 461 pushes the limiting member 450, causing the limiting block to enter the receiving groove, unlocking the locking hook 440. The locking hook 440 rotates under the drive of the torsion spring to cooperate with the locking pin 470, completing the mutual locking between the two sling units 40.

[0055] Third step, after hoisting, the erecting machine enters the reset state. Each electromagnet 430 is powered off, and the reset spring 431 releases elastic potential energy, causing the two electromagnets 430 to move away from each other, and driving the energy storage rack 432 to drive the rotating gear 442 to rotate, so that the locking hook 440 rotates to disengage from the locking pin 470, and the two docking heads 420 are disconnected.

[0056] Thus, in the embodiment of the precast beam bridge erecting machine of the present invention, the swinging driver 30 drives the two sling belts 410 to swing synchronously, and the electromagnet 430, the locking hook 440 and the locking pin 470 are used to complete the automatic docking and locking of the two docking heads 420, so that the two spreader units 40 can bypass the bottom of the precast beam 60 and complete the connection, enabling the hoisting trolley 20 to hoist the precast beam 60 onto the pier efficiently and safely. This greatly simplifies the operation steps, improves the construction efficiency, and eliminates the need for workers to frequently operate between the bridge erecting machine and the beam transporter, reducing the safety risks brought by personnel activities. In addition, the design that the end face of the electromagnet 430 is flush with the end face of the docking head 420 and the guiding function of the flat shell 411 are beneficial to ensuring the precise alignment and close fit of the two spreader units 40, improving the docking accuracy and reducing the docking deviation. The quick response of the electromagnet 430 and the automatic rotation design of the locking hook 440 enable the connection and separation between the spreader units 40 to be more rapid, shortening the hoisting preparation and reset time.

[0057] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A prefabricated beam bridge erecting machine, comprising a main beam extending forward and backward, a lifting trolley mounted on the main beam for forward and backward movement, the lifting trolley comprising a cross beam extending left and right, a lifting mechanism mounted on the cross beam for left and right movement, and a hoisting mechanism arranged at the lower end of the lifting mechanism, characterized in that: The hoisting mechanism comprises a hanger mounted at the lower end of the lifting mechanism, a swing drive mounted on the hanger, and two hanger units arranged on the hanger on the left and right sides; each hanger unit comprises a sling with an upper end mounted on the hanger and connected to the swing drive, a butt joint arranged at the lower end of the sling, and an electromagnet assembled in the butt joint along the length direction of the sling, one of the hanger units also comprises a locking hook rotatably mounted on the butt joint, a torsion spring connected between the butt joint and the locking hook, a limiting member arranged on the locking hook for limiting the rotation of the locking hook, and an unlocking member arranged on the butt joint for pushing the limiting member to allow the locking hook to rotate, and the other hanger unit also comprises a locking pin arranged on the butt joint; The swing driver is used to drive the two slings to swing inward synchronously, so that the two slings are wrapped around the outside of the precast beam and the two butt joints are close to each other at the bottom of the precast beam. The two electromagnets are used to start when the two butt joints are close to each other to attract each other, so that the end faces of the two butt joints are butted and the unlocking member is triggered to push the limiting member, so that the locking hook is driven by the elastic force of the torsion spring to rotate to cooperate with the locking pin, thereby realizing mutual locking between the two sling units; The swing drive comprises a double-headed hydraulic cylinder mounted on the hanger, a driving rack arranged at the output end of the double-headed hydraulic cylinder, a rotating wheel rotatably mounted on the hanger, a driving gear arranged on the rotating wheel and meshing with the driving rack, and the upper end of the sling is fixed on the rotating wheel; Each of the hanger units also includes a friction part arranged on the docking head, and the docking head is provided with an inclined groove inclined downward from the outside to the inside. The friction part is movably assembled in the inclined groove, and the upper end of the friction part has a friction surface for abutting the prefabricated beam, and the lower end of the friction part can be pushed by the electromagnet when the two electromagnets approach each other.

2. A prefabricated beam bridge erecting machine according to claim 1, characterized in that: The locking hook includes a rotating part rotatably mounted on the docking head, a rotating gear coaxially arranged with the rotating part, and a hook body fixed on the rotating part; a reset spring is arranged between each of the electromagnets and the docking head, and the reset spring is used to apply elastic force to the electromagnet so that the two electromagnets move away from each other; a force storage rack is fixed on the electromagnet corresponding to the locking hook, and the tooth portion of the force storage rack is a one-way tooth, which is used to drive the rotating gear to rotate when the two electromagnets move away from each other, so that the locking hook rotates to disengage from the locking pin.

3. The prefabricated beam bridge erecting machine according to claim 1, characterized in that: The locking pin comprises a pin body fixed on the butt joint for hooking the locking hook, and an anti-drop cap fixed on the end of the pin body away from the butt joint for preventing the locking hook from being separated from the pin body.

4. The prefabricated beam bridge erecting machine according to claim 2, characterized in that: The side wall of the rotating gear facing the docking joint is provided with a receiving groove for installing a limit piece, and the limit piece includes a limit block and a first spring connected between the receiving groove and the limit block. The side wall of the docking joint facing the rotating gear is provided with a limit groove, and the first spring is used to apply an elastic force to the limit block so that the limit block extends into the limit groove.

5. The prefabricated beam bridge erecting machine according to claim 4, characterized in that: The unlocking member is installed in the limiting groove, and the unlocking member includes an unlocking rod, a second spring connected between the unlocking rod and the limiting groove, the unlocking rod has a protruding head that can be pushed by the electromagnet, and a tail portion used to push the limiting block into the accommodating groove, and the second spring is used to apply elastic force to the unlocking rod to move the unlocking rod toward the electromagnet.

6. The prefabricated beam bridge erecting machine according to claim 1, characterized in that: Each of the slings comprises a shell and a sling arranged in the shell. The shell is flat, and the width direction of the shell extends forward and backward.

7. The prefabricated beam bridge erecting machine according to claim 6, characterized in that: An elastic bending portion is arranged in the length direction of the shell, and the elastic bending portion is made of a memory alloy material.

8. The prefabricated beam bridge erecting machine according to claim 1, characterized in that: The rotating wheel comprises a wheel axle, wheel rings arranged at both ends of the wheel axle in the length direction, and a wheel plate connected between the two wheel rings. The wheel plate is provided with a belt threading groove, and the upper end of the sling is fixed on the wheel axle and passes downward through the belt threading groove.

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