Double-bridge crane operation mode conversion system and method and bridge crane

Abstract

The invention discloses a double-bridge crane operation mode conversion system, which comprises a first cart extension rod, a second cart extension rod, a buffer and a parallel operation device, and is characterized in that the first cart extension rod and the second cart extension rod are respectively provided with a plurality of first mounting holes; the first mounting hole is configured to be selectively connected with a buffer or a base of the parallel operation device, and when the first bridge crane and the second bridge crane are in independent operation configuration, the first mounting hole and a mounting hole of the buffer are matched to be used for fixedly connecting the buffer and the first cart extension rod or the second cart extension rod through a fastener; and when the first bridge crane and the second bridge crane are in parallel operation configuration, the first mounting hole and the second mounting hole are matched for fixedly connecting the first base and the second base of the parallel operation device with the first cart extension rod and the second cart extension rod respectively through fasteners. The invention also discloses a corresponding method and a bridge crane. According to the invention, the operation mode conversion efficiency of the double-bridge crane is improved.

Description

Technical Field

[0001] This invention relates to the field of crane technology, specifically to a dual-bridge crane operation mode conversion system, a conversion method using the system, and a bridge crane equipped with the system. Background Technology

[0002] In large factories or work sites, bridge cranes are essential material handling equipment. Sometimes, to meet the lifting needs of extra-long and extra-heavy objects, two bridge cranes need to be arranged in parallel and work together, i.e., "parallel operation". However, under normal operating conditions, these two bridge cranes need to be able to operate independently without interfering with each other, i.e., "independent operation". Therefore, how to achieve a safe, reliable, and convenient switch between the two operating modes has become an important technical problem in this field.

[0003] Traditional mode conversion methods are typically complex, time-consuming, and labor-intensive, requiring the disassembly and installation of numerous components. Furthermore, the stability and reliability of the converted structure are often insufficient. For example, converting from independent operation to parallel operation may necessitate the replacement of all connecting components, making adjustments difficult and lacking effective condition monitoring and mechanical interlocks, thus posing safety hazards. Summary of the Invention

[0004] To solve the above-mentioned technical problems, the present invention provides a dual-bridge crane operation mode conversion system, method, and bridge crane that is ingeniously structured, flexible in conversion, safe and reliable.

[0005] This invention discloses a dual-bridge crane operation mode conversion system, which includes a first trolley extension rod of a first bridge crane and a second trolley extension rod of a second bridge crane, a buffer, and a paralleling device. When the first bridge crane and the second bridge crane operate independently, the buffer is fixedly connected to the first trolley extension rod. When the first bridge crane and the second bridge crane operate in parallel, one end of the paralleling device is fixedly connected to the first trolley extension rod, and the other end of the paralleling device is fixedly connected to the second trolley extension rod. Both the first trolley extension rod and the second trolley extension rod include a trolley extension rod body and a first connecting plate and a second connecting plate respectively disposed at both ends of the trolley extension rod body. The first connecting plate is used to connect the trolley running mechanism of the bridge crane, and the second connecting plate is provided with a plurality of first mounting holes. The buffer is provided with a mounting hole that matches the first mounting hole; The parallel vehicle device includes a swing arm and a first base and a second base respectively disposed at both ends of the swing arm. The first base and the second base each include a mounting end face and a hinge part. The hinge part of the first base is hinged to one end of the swing arm through a first pin, and the hinge part of the second base is detachably connected to the other end of the swing arm through a second pin. The mounting end face is provided with a second mounting hole corresponding to the first mounting hole. The first mounting hole is configured to selectively connect to the buffer or the base of the paralleling device. When the first bridge machine and the second bridge machine are in an independent operation configuration, the first mounting hole is paired with the mounting hole of the buffer to fix the buffer and the first or second trolley extension rod by fasteners. When the first bridge machine and the second bridge machine are in a parallel operation configuration, the first mounting hole is paired with the second mounting hole to fix the first and second bases of the paralleling device to the first and second trolley extension rods, respectively, by fasteners.

[0006] In addition, it also includes limit switches and limit struts; The limit switch is fixedly installed on the second large vehicle extension rod; The limiting support rod can be selectively installed on the first trolley extension rod or on the swing arm of the paralleling device; when the limiting support rod is installed on the trolley extension rod, the limiting support rod is used to trigger the limit switch when the buffer is compressed to a preset stroke; when the limiting support rod is installed on the swing arm, the limiting support rod is used to trigger the limit switch when the swing arm of the paralleling device is connected to the second base.

[0007] In addition, it also includes a longitudinal adjustment component, which includes an adjustment pad, a guide shaft, and an external thread adjustment part; The first large vehicle extension rod also includes an inner cylinder and an outer cylinder coaxially disposed between the first connecting plate and the second connecting plate. A support ring is provided between one end of the inner cylinder and the outer cylinder, and an internal thread adjustment interface is provided at one end of the inner cylinder near the support ring. When the vehicles are running side by side, the external thread adjustment part of the longitudinal adjustment member is screwed into the internal thread adjustment interface of the first trolley extension rod, and the internal thread adjustment interface and the external thread adjustment part form a helical pair connection.

[0008] In addition, the hinge portion of the first base and the second base both include two parallel connecting arms, which are perpendicular to the mounting end face. A space for receiving the end of the swing arm is formed between the two connecting arms, and each connecting arm is provided with a coaxial pin hole.

[0009] In addition, the inner cavity width between the connecting arms is W1, and the width of the corresponding end of the swing arm is W2. The difference between the inner cavity width W1 of the connecting arm and the width W2 of the corresponding end of the swing arm is greater than 30mm.

[0010] In addition, the feature is that one end of the swing arm is provided with a circular pin hole, and a rotary hinge with clearance fit is formed between the first pin shaft and the hinge part of the first base; the other end of the swing arm is provided with a vertically open U-shaped groove, and the U-shaped groove constitutes a detachable connection interface with clearance fit with the second pin shaft.

[0011] Correspondingly, a method for switching the operation mode of a dual-bridge crane is also disclosed, used to switch the dual-bridge crane from a parallel operation mode to a parallel operation mode. The method is applied to the switching system described in any one of claims 1-6, wherein the method includes the following steps: Remove the buffer installed on the trolley extension rod to expose the first mounting hole on the corresponding second connecting plate; Align the mounting end face of the first base with the second connecting plate of the first trolley extension rod, align the second mounting hole with the first mounting hole, and secure the connection with fasteners. Align the mounting end face of the second base with the second connecting plate of the second trolley extension rod, align the second mounting hole with the first mounting hole, and secure the connection with fasteners. One end of the swing arm is hinged to the hinge part of the first base by a first pin. The other end of the rocker arm is detachably connected to the hinge of the second base via a second pin.

[0012] In addition, the paralleling device of the conversion system further includes a longitudinal adjusting component, which is provided with an external thread adjusting part, and the trolley extension rod is provided with an internal thread adjusting interface that mates with the external thread adjusting part. The method further includes: The longitudinal adjustment component is installed between the second connecting plate of the first trolley extension and the mounting end face of the first base; Screw the external thread adjustment part of the longitudinal adjustment component into the internal thread adjustment interface of the first large carriage extension rod; Rotate the longitudinal adjustment component to adjust the distance between the first base and the first trolley extension rod.

[0013] In addition, the conversion system also includes a limit strut and a limit switch, and the method further includes: Remove the limiting strut installed on the first large vehicle extension rod; The limiting support rod is installed at a preset position on the swing arm, so that when the swing arm is reliably connected to the second base through the second pin, the limiting support rod triggers the limiting switch installed on the second trolley extension rod.

[0014] Correspondingly, a bridge crane is also disclosed, which is equipped with the aforementioned dual-bridge crane operation mode conversion system.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: By sharing the same set of "first mounting holes" on the trolley extension rod, a quick switch between the buffer (independent mode) and the paralleling device base (paralleling mode) is achieved without requiring complex modifications or replacements to the trolley extension rod itself, thus improving the flexibility and convenience of switching between different operating modes of the bridge crane. The innovative limit strut reuse design allows the limit strut to be installed in different positions in different modes, achieving dual mechanical and electrical safety interlocking by triggering the limit switch in different modes. In independent mode, it monitors the buffer compression limit; in parallel mode, it confirms that the swing arm is connected in place, preventing misoperation and improving system safety, safety interlocking, and status indication. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the first embodiment of a dual-bridge machine operation mode conversion system of the present invention when the dual-bridge machine is in an independent operation configuration; Figure 2 yes Figure 1 A schematic diagram of a structural embodiment of a medium-sized vehicle extension rod; Figure 3 for Figure 2 A schematic diagram of the structure along direction A; Figure 4 This is a schematic diagram of the first embodiment of the dual-bridge crane operation mode conversion system of the present invention under the parallel operation configuration; Figure 5 for Figure 4 A schematic diagram of the base of the parallel vehicle device; Figure 6 This is a schematic diagram of a second embodiment of the dual-bridge machine operation mode conversion system of the present invention when the dual-bridge machine is in an independent operation configuration; Figure 7 This is a schematic diagram of the second embodiment of the dual-bridge machine operation mode conversion system of the present invention when the dual-bridge machines are in parallel operation configuration; Figure 8 This is a schematic diagram of the third embodiment of the dual-bridge machine operation mode conversion system of the present invention when the dual-bridge machines are in parallel operation configuration; Figure 9 yes Figure 8 A schematic diagram of one embodiment of the base; Figure 10 yes Figure 8 A schematic diagram of one embodiment of the pendulum rod. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0018] The core of this invention lies in providing a solution for switching between different operating modes of a dual-bridge crane that is deeply integrated with the trolley extension rod of the bridge crane.

[0019] like Figure 1-5As shown, the dual-bridge crane operation mode conversion system of the present invention includes a first trolley extension rod 100 of the first bridge crane 800 and a second trolley extension rod 200 of the second bridge crane 900, a buffer 500, and a paralleling device 300. When the first bridge crane 800 and the second bridge crane 900 operate independently, the buffer 500 is fixedly connected to the first trolley extension rod 100 of the first bridge crane 800. When the first bridge crane 800 and the second bridge crane 900 operate in parallel, one end of the paralleling device 300 is fixedly connected to the first trolley extension rod 100, and the other end of the paralleling device 300 is fixedly connected to the second trolley extension rod 200.

[0020] The first trolley extension rod 100 and the second trolley extension rod 200 both include a trolley extension rod body 101 and a first connecting plate 102 and a second connecting plate 103 respectively disposed at both ends of the trolley extension rod body 101. The first connecting plate 102 is used to fix and connect to the trolley traveling mechanism of the bridge crane. The second connecting plate 103 has multiple first mounting holes 104. The buffer 500 is provided with a buffer mounting hole that matches the first mounting hole 104.

[0021] In stand-alone configuration, the buffer 500 is fixedly connected to the first trolley extension 100 (or the second trolley extension 200) by fasteners (such as bolts) passing through its own mounting holes and the first mounting holes 104 on the second connecting plate 103 of the trolley extension for collision protection.

[0022] The parallel vehicle device 300 includes a rocker arm 330, a first base 310, and a second base 320. One end of the rocker arm 330 is rotatably hinged to the first base 310 via a first pin 340, and the other end of the rocker arm 330 is detachably connected to the second base 320 via a second pin 350. Each base includes a mounting end face 311, and the mounting end face is provided with a second mounting hole 312 that matches the first mounting hole 104.

[0023] When switching to a parallel operation configuration, the buffer 500 is removed, exposing the first mounting hole 104 on the trolley extension rod. Then, the mounting end faces 311 of the first base 310 and the second base 320 of the parallel operation device 300 are respectively attached to the second connecting plates 103 of the first trolley extension rod 100 of the first bridge crane 800 and the second trolley extension rod 200 of the second bridge crane 900, so that the second mounting hole 312 is aligned with the first mounting hole 104, and fasteners are passed through and tightened, thereby firmly installing both ends of the parallel operation device 300 on the two bridge cranes respectively. One end of the swing arm 330 is hinged to the first base 310 through the first pin 340, and the other end of the swing arm 330 is detachably connected to the second base 320 through the second pin 350.

[0024] In this embodiment, by sharing the same set of "first mounting holes" on the trolley extension rod, a quick switch between the buffer (independent mode) and the paralleling device base (paralleling mode) is achieved without the need for complex modification or replacement of the trolley extension rod body, thus improving the flexibility and convenience of switching between different operating modes of the bridge crane.

[0025] like Figure 6-7 As shown, in the second embodiment of the dual-bridge crane operation mode conversion system of the present invention, a limiting device is also included. The limiting device includes a limiting switch 710 and a limiting support rod 720. A limiting support rod bracket 730 is provided on the first trolley extension rod, and a limiting switch bracket 740 is provided on the second trolley extension rod. The limiting switch 710 is installed and fixed on the limiting switch bracket 740.

[0026] In independent operation mode, the limit strut 720 is mounted on the first trolley extension 100 of a bridge crane (e.g., the first bridge crane) via a strut bracket 730. When an accidental collision occurs and the buffer 500 is compressed to a preset limit, it triggers the limit switch 710 mounted on the second trolley extension 200, providing additional protection. In parallel operation mode, the limit strut 720 needs to be transferred to the swing arm 330. After the swing arm 330 is reliably connected to the second base 320, the limit strut 720 on the swing arm 330 triggers the limit switch 710 mounted on the second trolley extension 200. The limit switch 710 sends a "mechanical connection complete" signal to the control system, achieving a safety interlock.

[0027] It should be noted that this embodiment adopts a limit strut reuse design. The limit strut is installed in different positions in different modes, so that by triggering the limit switch in different modes, a dual safety interlock of mechanical and electrical systems is achieved. In independent operation mode, the buffer compression limit is monitored; in parallel operation mode, the connection of the swing arm is confirmed to be in place to prevent misoperation and improve system safety, safety interlock, and status indication.

[0028] The third embodiment of the dual-bridge crane operation mode conversion system of the present invention in parallel operation configuration will be described below.

[0029] like Figure 8-10 The difference between this embodiment and the second embodiment of the parallel operation configuration is that this embodiment also includes a longitudinal adjustment component 400, which is disposed between the first base 310 and the first trolley extension rod 100. The main body of the first trolley extension rod 100 adopts a structure to enhance rigidity, that is, an inner cylinder 106 and an outer cylinder 105 are coaxially disposed between the first connecting plate and the second connecting plate. The inner cylinder 106 is provided with an internal thread adjustment interface 107 at one end near the second connecting plate.

[0030] The longitudinal adjustment component 400 includes an adjustment pad 401, a guide shaft 402, and a coaxial external thread adjustment part 403. The external thread adjustment part 403 cooperates with the internal thread adjustment interface 107 of the first trolley extension rod to form a helical pair. In specific implementation, the helical pair can adopt a trapezoidal thread to form a self-locking connection.

[0031] In practice, the longitudinal adjusting component 400 and the first trolley extension rod 100 are connected by a helical pair formed by the external thread adjusting part and the internal thread adjusting interface. When paralleling, the adjusting pad 401 can be rotated to adjust the paralleling device in the longitudinal direction of the track until the paralleling devices on the left and right sides are adjusted to be consistent. Then, the paralleling base is placed against the pad and connected to the trolley extension rod by bolts. Through this unique trapezoidal thread adjusting plate design, the longitudinal adjustment of the paralleling device in the track is realized, which improves the installation accuracy of the paralleling device.

[0032] Furthermore, in this embodiment, both the first base 310 and the second base 320 include a mounting end face 311 and a hinge portion perpendicular to the end face. A second mounting hole 312 is provided on the mounting end face 311, which matches the first mounting hole 104 of the trolley extension rod. The hinge portion includes two parallel connecting arms 313, forming a space between the two arms. Each connecting arm 313 is machined with a coaxial pin hole 314. Additionally, to enhance the structural strength of the pin hole 313 and facilitate machining of the pin hole end while ensuring surface roughness, a mounting plate 315 is also provided on the connecting arm 313. Among them, the inner cavity width W1 between the two connecting arms 313 is significantly larger than the corresponding end thickness W2 of the swing arm 330, and the difference (W1-W2) is greater than 30mm. In other words, the adjustment margin of the swing arm connection in the lateral direction of the track can completely cover the 15mm gap between the wheel flange of the trolley and the track in the lateral direction. Therefore, through this swing arm design, the paralleling device can be automatically adjusted in the lateral direction of the track, thus providing sufficient clearance for automatic lateral alignment.

[0033] Furthermore, the swing arm 330 in this embodiment is a long rod structure with high bending strength. One end of the swing arm 330 is machined with a circular pin hole 331. This end is inserted between the two connecting arms 313 of the first base 310. The first pin 340 passes through the pin hole 314 of the connecting arm 313 and the circular pin hole 331 of the swing arm, thereby achieving the hinge connection between the swing arm 330 and the first base 310.

[0034] The other end of the swing arm 330 is machined with a vertically open U-shaped groove 332. When parallel operation is required, the second pin 350 passes through the pin hole 314 of the connecting arm 313 of the second base 320 and connects to the second base 320. Then, one end of the swing arm 330 rotates around the first pin 340 to the second pin 350, and the U-shaped groove 332 of the swing arm engages with the second pin 350. The design of the U-shaped groove 332 makes the insertion and removal of the second pin 350 very convenient, realizing the detachable connection between the swing arm and the second base through the second pin, thus improving the efficiency of parallel and decoupling operations. Since the travel frequency converter motor of the dual-bridge machine runs synchronously under electrical control during parallel operation, the parallel swing arm 330 only plays an auxiliary pushing and pulling role, so the U-shaped groove is not subjected to force during normal operation. If there is a deviation in the electrical control, the inner wall of the U-shaped groove will have a contact surface with the second pin 350. This contact surface will be subjected to the longitudinal force of the track. Since there is no vertical force, the rocker arm 330 will not disengage from the second pin 350. Because the inner width of the U-shaped groove is slightly larger than the diameter of the second pin 350, the rocker arm 330 can be freely engaged or disengaged from the second pin 350 by means of external force around the first pin 340.

[0035] In practical implementation, when there is a vertical deviation between the two bridge cranes on the track, the paralleling device can automatically adjust vertically on the track due to the clearance fit between the U-shaped groove of the swing arm and the second pin, and the U-shaped groove design on the side of the swing arm that engages with the second pin. It can be seen that the end of the swing arm 330 connected to the second base 320 is designed as a vertically open U-shaped groove 332, and its clearance fit with the second pin 350 gives the swing arm a certain degree of floating capability in the vertical direction, allowing it to adapt to vertical deviations.

[0036] In summary, the dual-bridge crane operation mode conversion system in this embodiment of the invention forms a stable triangular or near-triangular force-bearing structure by hinged one end of the merging device's swing arm to the first base and detachably connected the other end to the second base. This structure effectively transmits lateral forces during merging. Furthermore, the trolley extension rod employs an inner and outer cylinder structure with supporting rings, improving structural stability and reliability. Additionally, the base utilizes a double-connecting arm structure, increasing the pin bearing area and enhancing connection strength. Sufficient clearance (>30mm) is maintained between the inner cavity of the connecting arm and the end of the swing arm for easy on-site installation and adjustment. The U-shaped groove design at one end of the swing arm simplifies the connection process to the second base, requiring only the insertion of the second pin without precise hole alignment. Moreover, by incorporating a longitudinal adjustment component, the longitudinal distance between the two bridge cranes can be fine-tuned to compensate for manufacturing, installation errors, or track deviations, ensuring smooth installation and effective operation of the merging device and providing tolerance adjustment capability.

[0037] Furthermore, key functions in this invention are deeply integrated into the trolley extension rod, significantly reducing the physical space of the paralleling device and facilitating routine inspection and maintenance of the bridge crane. In actual implementation, the paralleling device of this invention weighs only about 80 kg, and with the two bases installed separately, each weighs approximately 40 kg. This is quite convenient for frontline operators and helps improve work efficiency. Moreover, the paralleling device has low manufacturing cost, simple structure, and is easy to install and disassemble.

[0038] Furthermore, the dual-bridge turbine operation mode conversion system of this invention has been successfully trial-run in CGN projects with extremely high design and operational requirements: the 320t bridge turbine of Shidaowan Nuclear Power Plant, the 320t bridge turbines of Ningde Units 5 and 6, the 320t bridge turbine of San'ao Phase II Nuclear Power Plant, the 320t bridge turbine of Taipingling Phase II Nuclear Power Plant, and the 240t bridge turbine of Lufeng Phase I. Since the trial operation of some installed projects, the safety and reliability have been excellent, and it has been highly praised by the owners. Another invention of this invention is described below.

[0039] An embodiment of the method for switching operating modes of a dual-bridge crane according to the present invention includes the following steps: Step S1, removing the original buffers on the main extension rods of the two bridge cranes. Step S2, screwing the longitudinal adjustment component 400 into the internal thread adjustment interface 107 of the first main extension rod 100; Step S3: Initially adjust the depth of the longitudinal adjustment component screwed into the first trolley extension rod; Step S4: Fasten the first base 310 and the second base 320 to the second connecting plate 103 of the first trolley extension rod 100 and the second trolley extension rod 200 respectively with fasteners; Step S5: Hinge one end of the swing rod 330 to the first base 310 through the first pin 340. Step S6: Pass the second pin through the pin hole of the connecting arm of the second base and fix it to the connecting arm; Step S7: Lift the free end of the rocker arm 330 and align the U-shaped groove 332 of the rocker arm with the second pin that is fixedly connected to the hinge part of the second base 320. Step S8: Adjust the longitudinal adjusting component until the bottom of the U-shaped groove of the swing arm reliably contacts the second pin 350. Step S9: Remove the limiting support rod 720 from its original position on the trolley extension rod. Step S10: Install the limiting support rod 720 onto the swing rod 330; Step S11: Adjust the installation position of the swing arm until the limit support rod reliably triggers the limit switch 710 to send a parallel connection signal after the swing arm falls; Step S13: When the electrical system receives the parallel connection signal from the limit switch, it is determined that the conversion is complete.

[0040] In addition, the present invention also provides a bridge crane, which is equipped with the above-mentioned dual-bridge crane operation mode conversion system as standard or optional, enabling it to quickly and safely convert to parallel lifting mode.

[0041] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, should be included within the patent protection scope of the present invention.

Claims

1. A dual-bridge crane operation mode switching system, characterized in that, It includes a first trolley extension rod of the first bridge crane and a second trolley extension rod of the second bridge crane, a buffer, and a merging device. When the first bridge crane and the second bridge crane operate independently, the buffer is fixedly connected to the first trolley extension rod. When the first bridge crane and the second bridge crane operate in merging mode, one end of the merging device is fixedly connected to the first trolley extension rod, and the other end of the merging device is fixedly connected to the second trolley extension rod. Both the first trolley extension rod and the second trolley extension rod include a trolley extension rod body and a first connecting plate and a second connecting plate respectively disposed at both ends of the trolley extension rod body. The first connecting plate is used to connect the trolley running mechanism of the bridge crane, and the second connecting plate is provided with a plurality of first mounting holes. The buffer is provided with a mounting hole that matches the first mounting hole; The parallel vehicle device includes a swing arm and a first base and a second base respectively disposed at both ends of the swing arm. The first base and the second base each include a mounting end face and a hinge part. The hinge part of the first base is hinged to one end of the swing arm through a first pin, and the hinge part of the second base is detachably connected to the other end of the swing arm through a second pin. The mounting end face is provided with a second mounting hole corresponding to the first mounting hole. The first mounting hole is configured to selectively connect to the buffer or the base of the paralleling device. When the first bridge machine and the second bridge machine are in an independent operation configuration, the first mounting hole is paired with the mounting hole of the buffer to fix the buffer and the first or second trolley extension rod by fasteners. When the first bridge machine and the second bridge machine are in a parallel operation configuration, the first mounting hole is paired with the second mounting hole to fix the first and second bases of the paralleling device to the first and second trolley extension rods, respectively, by fasteners.

2. The dual-bridge crane operation mode conversion system according to claim 1, characterized in that, It also includes limit switches and limit struts; The limit switch is fixedly installed on the second large vehicle extension rod; The limiting support rod can be selectively installed on the first trolley extension rod or on the swing arm of the paralleling device; when the limiting support rod is installed on the trolley extension rod, the limiting support rod is used to trigger the limit switch when the buffer is compressed to a preset stroke; when the limiting support rod is installed on the swing arm, the limiting support rod is used to trigger the limit switch when the swing arm of the paralleling device is connected to the second base.

3. The dual-bridge crane operation mode conversion system according to claim 1, characterized in that, It also includes a longitudinal adjustment component, which includes an adjustment pad, a guide shaft, and an external thread adjustment part; The first large vehicle extension rod also includes an inner cylinder and an outer cylinder coaxially disposed between the first connecting plate and the second connecting plate. A support ring is provided between one end of the inner cylinder and the outer cylinder, and an internal thread adjustment interface is provided at one end of the inner cylinder near the support ring. When the vehicles are running side by side, the external thread adjustment part of the longitudinal adjustment member is screwed into the internal thread adjustment interface of the first trolley extension rod, and the internal thread adjustment interface and the external thread adjustment part form a helical pair connection.

4. The dual-bridge crane operation mode conversion system according to claim 1, characterized in that, The hinge portion of both the first base and the second base includes two parallel connecting arms. The connecting arms are perpendicular to the mounting end face, and a space for receiving the end of the swing arm is formed between the two connecting arms. Each connecting arm is provided with a coaxial pin hole.

5. The dual-bridge crane operation mode conversion system according to claim 4, characterized in that, The inner cavity width between the connecting arms is W1, and the width of the corresponding end of the swing arm is W2. The difference between the inner cavity width W1 of the connecting arm and the width W2 of the corresponding end of the swing arm is greater than 30mm.

6. The dual-bridge crane operation mode conversion system according to any one of claims 1-5, characterized in that, One end of the swing arm is provided with a circular pin hole, and a rotary hinge with clearance fit is formed between the first pin and the hinge part of the first base; the other end of the swing arm is provided with a vertically open U-shaped groove, which constitutes a detachable connection interface with clearance fit with the second pin.

7. A method for switching the operating mode of a dual-bridge crane, used to switch a dual-bridge crane from a parallel operating mode to a parallel operating mode, the method being applied to the switching system according to any one of claims 1-6, characterized in that, The method includes the following steps: Remove the buffer installed on the trolley extension rod to expose the first mounting hole on the corresponding second connecting plate; Align the mounting end face of the first base with the second connecting plate of the first trolley extension rod, align the second mounting hole with the first mounting hole, and secure the connection with fasteners. Align the mounting end face of the second base with the second connecting plate of the second trolley extension rod, align the second mounting hole with the first mounting hole, and secure the connection with fasteners. One end of the swing arm is hinged to the hinge part of the first base by a first pin. The other end of the rocker arm is detachably connected to the hinge of the second base via a second pin.

8. The method for switching operating modes of a dual-bridge crane according to claim 7, characterized in that, The paralleling device of the conversion system further includes a longitudinal adjusting component, which is provided with an external thread adjusting part. The trolley extension rod is provided with an internal thread adjusting interface that mates with the external thread adjusting part. The method further includes: The longitudinal adjustment component is installed between the second connecting plate of the first trolley extension and the mounting end face of the first base; Screw the external thread adjustment part of the longitudinal adjustment component into the internal thread adjustment interface of the first large carriage extension rod; Rotate the longitudinal adjustment component to adjust the distance between the first base and the first trolley extension rod.

9. The method for switching operating modes of a dual-bridge crane according to claim 8, characterized in that, The conversion system also includes a limit strut and a limit switch, and the method further includes: Remove the limiting strut installed on the first large vehicle extension rod; The limiting support rod is installed at a preset position on the swing arm, so that when the swing arm is reliably connected to the second base through the second pin, the limiting support rod triggers the limiting switch installed on the second trolley extension rod.

10. A bridge crane, characterized in that, It is equipped with a dual-bridge machine operation mode conversion system according to any one of claims 1-6.

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