Railway simply supported T-beam beam replacing machine

Abstract

The application provides a beam replacement machine for dismantling and replacing a railway simply supported T beam, and the main beam is provided with: two hoisting trolleys, which are installed on the main beam and move along the main beam; two main legs, which comprise two C-shaped half legs, the top parts of the two half legs are respectively hinged to the left and right sides of the main beam, and the two half legs can be horizontally rotated to be folded with the main beam under the driving of a folding mechanism; telescopic columns are arranged in the two half legs; two walking wheel groups are arranged, which are respectively hinged to the bottoms of the two C-shaped half legs on the left and right sides, and are used for driving the walking of the whole beam replacement machine; two auxiliary legs are arranged, the auxiliary legs are provided with a turnover mechanism for controlling the overall vertical turnover of the auxiliary legs to be parallel to the main beam, and a lifting mechanism for controlling the overall up-down lifting of the auxiliary legs. The application has the advantages of simple structure, convenient operation, short beam replacement construction period and the like.

Description

Technical Field

[0001] This utility model belongs to the field of bridge engineering technology, and in particular relates to a beam replacement machine for dismantling and replacing damaged and aging railway simply supported T-beams under railway operation conditions. Background Technology

[0002] In recent years, with the rapid development of high-speed rail construction technology in my country, the mileage of high-speed railways in operation and under construction has grown rapidly, reaching a total of 46,000 kilometers. However, conventional railways, due to their earlier construction and longer operating cycles, still occupy a dominant position in my country's railway passenger transport. Currently, the operating mileage of conventional railways in my country is approximately 107,000 kilometers, far exceeding the total mileage of high-speed railways. Bridges constitute a large proportion of railway lines and are the main engineering component. In conventional railways, simply supported beams of 32 meters or less account for nearly 26%. Due to various factors such as design level, construction conditions, operation and maintenance environment, and service life, some of the older concrete T-beams in my country have developed problems such as cracks, corrosion, and aging, and their strength or stiffness can no longer meet transportation requirements, necessitating replacement. Therefore, research is urgently needed on replacement and transport construction techniques and complete sets of construction equipment under operating conditions. In this context, the railway simply supported T-beam replacement machine has emerged.

[0003] The existing methods for replacing railway bridge beams in my country mainly include the lateral movement method, gantry crane method, truck crane method, and bridge erecting machine method. These methods require closing the track and interrupting train operation, and are heavily dependent on site conditions. Considering factors such as the construction environment and timeframe, existing beam replacement equipment and technologies are insufficient to meet on-site construction needs. Minimizing the impact on railway operations and ensuring the safety, reliability, and speed of beam replacement construction necessitates research into replacement and transport construction technologies and complete sets of construction equipment under operational conditions. However, currently, there is no dedicated beam replacement machine in this field capable of replacing simply supported T-beams of railways during operational windows. Utility Model Content

[0004] To address the shortcomings of traditional beam replacement devices, this utility model provides a beam replacement machine for dismantling and replacing damaged and aging simply supported T-beams of railways under railway operating conditions. It adopts a whole-body dismantling, whole-body assembly, and self-propelled approach, enabling rapid transportation and construction on existing lines. It has the advantages of simple structure, convenient operation, and short beam replacement construction cycle.

[0005] The technical solution adopted to achieve the above-mentioned objectives of this utility model is as follows:

[0006] A railway simply supported T-beam replacement machine includes at least a main beam and a power system, an electro-hydraulic control system, and a driver's cab installed on the main beam. The main beam is equipped with:

[0007] There are two hoisting trolleys, which are installed on the main beam and move along the main beam;

[0008] There are two main legs, which are respectively connected to the front section and the rear section of the main beam. A telescopic column and a folding mechanism for controlling the main leg to rotate horizontally to be folded with the main beam are arranged in the main leg;

[0009] There are two traveling wheel sets, which are installed below the main legs and are used to drive the whole beam-changing machine to travel;

[0010] There are two auxiliary legs, which are respectively connected to the front section and the rear section of the main beam and are located outside the two main legs. A turning mechanism for controlling the whole auxiliary leg to turn vertically to be parallel to the main beam and a lifting mechanism for controlling the whole auxiliary leg to move up and down are arranged on the auxiliary leg.

[0011] Furthermore, the main beam adopts a single-main-beam box structure. The single main beam is divided into 4 segments, each segment is a welded box structure, and the segments are connected by high-strength bolts; Tracks for the hoisting trolley to move are arranged on the side of the lower cover plate of the main beam, and tracks for the hoisting trolley to move are arranged above the lug beam of the main beam.

[0012] Furthermore, the overall structure of the main leg is in a "mouth" shape, including two C-shaped half legs. The tops of the two half legs are respectively hinged on the left and right sides of the main beam, and the two half legs can be horizontally rotated to be folded with the main beam under the drive of the folding mechanism.

[0013] Furthermore, the traveling wheel set includes a traveling frame and traveling wheels. The left and right sides of the traveling frame are hinged to the bottom of the main leg, and the traveling wheels are installed below the traveling frame. The traveling wheel set is used to drive the whole beam-changing machine to travel.

[0014] Furthermore, the half leg includes a first main beam connecting seat, an upper cross beam, a telescopic column and a lower cross beam. The first main beam connecting seat is fixed on the side of the upper part of the main beam by bolts. The upper cross beam is hinged to the first main beam connecting seat through a vertical pin shaft. The telescopic column is connected between the upper cross beam and the lower cross beam. The telescopic column includes an outer column and an inner column, and a telescopic oil cylinder is installed between the two; The lower cross beam is hinged to the traveling frame in the traveling wheel set through a vertical pin shaft.

[0015] Furthermore, the folding mechanism includes a folding oil cylinder, and the folding oil cylinder is installed between the upper cross beam and the first main beam connecting seat.

[0016] Furthermore, the inner column is uniformly provided with pin holes from top to bottom, and the bottom of the outer column is also correspondingly provided with pin holes, and pins are arranged in the pin holes.

[0017] Further, the auxiliary outrigger is composed of two single outriggers, which are respectively fixed on the left and right sides of the main beam. Each single outrigger includes a second main beam connecting seat, a lifting column, and a support seat. The second main beam connecting seat is fixed on the side of the upper part of the main beam by bolts. The top of the lifting column is hinged to the second main beam connecting seat through a horizontal pin shaft, and the bottom end of the lifting column is fixedly connected to the support seat.

[0018] Further, the lifting mechanism includes a lifting oil cylinder, and both ends of the lifting oil cylinder are respectively connected inside the lifting column. The overall lifting of the auxiliary outrigger is controlled by the lifting of the lifting oil cylinder.

[0019] Further, the flipping mechanism includes an upper flipping seat, a lower flipping seat, and a flipping oil cylinder. The upper flipping seat is fixedly connected to the second main beam connecting seat, the lower flipping seat is fixedly connected to the lifting column, the top end of the flipping oil cylinder is hinged to the upper flipping seat, and the bottom end is hinged to the lower flipping seat.

[0020] The utility model has the following beneficial effects compared with the prior art:

[0021] 1. The simply supported T-beam beam-changing machine for railways provided by the utility model travels from the beam yard to the beam section to be replaced along the existing railway tracks in a self-propelled manner, and returns to the beam yard or the next construction site in a self-propelled manner after the beam-changing is completed. During the traveling and transportation process, the whole machine is in a low position, and during the beam-changing process, the whole machine is in a high position. The switching between the traveling condition and the beam-changing condition can be realized by simply switching between the high position and the low position (realized by the telescoping of the main outriggers), so the construction efficiency is high.

[0022] 2. The main outrigger of the utility model is in an overall "mouth" shape, and its internal width is greater than the width of a single simply supported T-beam for railways. Therefore, the width of the main outrigger is relatively large. If there is a tunnel between the beam yard and the construction site, the folding mechanism is used to fold the two C-shaped half outriggers inward to make them parallel to the main beam. By folding, the width of the main outrigger can be greatly reduced, so that the whole beam-changing machine can pass through the tunnel smoothly.

[0023] 3. The utility model is provided with a flipable auxiliary outrigger. The auxiliary outrigger can be vertically flipped as a whole to be parallel to the main beam under the action of the flipping mechanism, and can also be lifted and lowered as a whole under the action of the lifting mechanism. The main function of the auxiliary outrigger is to support the whole beam-changing machine during the telescoping process of the main outrigger (i.e., the switching between the high position and the low position) and the folding process of the main outrigger; during the self-propelled and beam-changing processes of the beam-changing machine, the auxiliary outrigger is in an overall flipped state, and the height after the flipping of the auxiliary outrigger is higher than the top height of the hoisting trolley. Therefore, it does not cause any influence on the forward and backward movement of the hoisting trolley along the main beam during the beam-changing process. Description of the Drawings

[0024] Figure 1A schematic diagram of the overall structure of the railway simply supported T-beam beam replacement machine provided by this utility model (beam replacement state);

[0025] Figure 2 A schematic diagram of the overall structure (traveling state) of the railway simply supported T-beam beam replacement machine provided by this utility model;

[0026] Figure 3 A schematic diagram of the overall structure of the railway simply supported T-beam beam replacement machine provided by this utility model (in tunnel condition);

[0027] Figure 4 A side view of the overall structure of the railway simply supported T-beam beam replacement machine provided by this utility model (beam replacement state);

[0028] Figure 5 A side view of the overall structure (traveling state) of the railway simply supported T-beam beam replacement machine provided by this utility model;

[0029] Figure 6 A side view of the overall structure of the railway simply supported T-beam beam replacement machine provided by this utility model (in tunnel condition);

[0030] Figure 7 This is a schematic diagram of the overall structure of the main support leg under beam replacement conditions.

[0031] Figure 8 This is a schematic diagram of the overall structure of the main support leg during tunnel crossing.

[0032] Figure 9 A schematic diagram of the overall structure of the support leg in a supported state;

[0033] Figure 10 A side view of the overall structure of the outrigger in its supported state;

[0034] Figure 11 This is a schematic diagram of the overall structure of the crane trolley;

[0035] Figure 12 Flowchart of beam replacement construction steps S1 of the railway simply supported T-beam beam replacement machine provided by this utility model;

[0036] Figure 13 Flowchart of S2 for beam replacement construction steps of the railway simply supported T-beam beam replacement machine provided by this utility model;

[0037] Figure 14 Flowchart of the beam replacement construction steps S3 of the railway simply supported T-beam beam replacement machine provided by this utility model;

[0038] Figure 15 S4 flowchart of the beam replacement construction steps of the railway simply supported T-beam beam replacement machine provided by this utility model;

[0039] Figure 16S5 flowchart of beam replacement construction steps of the railway simply supported T-beam beam replacement machine provided by this utility model;

[0040] Figure 17 S6 flowchart of beam replacement construction steps of the railway simply supported T-beam beam replacement machine provided by this utility model;

[0041] Figure 18 Flowchart of S7 for beam replacement construction steps of the railway simply supported T-beam beam replacement machine provided by this utility model;

[0042] Figure 19 S8 flowchart of the beam replacement construction steps of the railway simply supported T-beam beam replacement machine provided by this utility model;

[0043] In the diagram: 1-Main beam, 11-Lower cover plate, 12-Side web plate, 13-Ear beam, 2-Lifting trolley, 21-Winding mechanism, 22-Wire rope, 23-Lifting device, 3-Main support leg, 31-First main beam connecting seat, 32-Upper crossbeam, 33-Telescopic column, 331-Outer column, 332-Inner column, 333-Telescopic cylinder, 334-Pin hole, 335-Pin, 34-Lower crossbeam, 35-Vertical pin, 4-Traveling wheel set, 41-Traveling frame, 42-Traveling wheel, 5-Auxiliary support leg, 51-Second main beam connecting seat, 52-Lifting column, 53-Support seat, 54-Horizontal pin, 55-Lifting cylinder, 56-Upper tilting seat, 57-Lower tilting seat, 58-Tilting cylinder, 6-Beam transport vehicle, 7-Simply supported T-beam. Detailed Implementation

[0044] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0045] The overall structure of a railway simply supported T-beam beam replacement machine provided in this embodiment is as follows: Figure 1 , Figure 2 and Figure 3 As shown, Figure 1 , Figure 2 and Figure 3 These correspond to the beam replacement state, the traveling state, and the tunnel crossing state, respectively. Figure 2 and Figure 3 The auxiliary outriggers are not shown in the diagram because they are in a flipped-over state.

[0046] Main beam 1 is the main load-bearing structure of the beam replacement machine, refer to Figure 1 as well as Figure 10The main beam 1 adopts a single main beam box structure, with each main beam divided into 4 segments. Each segment is a welded box structure, and the segments are connected by 10.9 grade high-strength bolts. The two segments at the beginning and end have an upward pre-arch, while the two middle segments do not. The lower cover plate 11 of the main beam 1 has a track for the movement of the crane trolley 2 on its side, and the side lug beams 13 of the side web plate 12 of the main beam 1 have a track for the operation of the crane trolley 2. The main beam 1 is also equipped with a power system, an electro-hydraulic control system, and a driver's cab. These modules are conventional designs in this field and will not be described in detail in this embodiment, nor are they shown in the accompanying drawings.

[0047] There are two crane trolleys, one at the front and one at the rear, and their structure is as follows: Figure 4 as well as Figure 11 The lifting trolley 2 is mounted on the main beam 1 and moves along the main beam. The lifting trolley 2 adopts a suspended structure, and is entirely suspended on the ear beam 13 at the lower part of the main beam. The lifting trolley 2 is located at the lower part of the main beam 1, and the top height of the lifting trolley 2 is lower than the height of the auxiliary outrigger 5 after it is flipped. Two winch mechanisms 21 are installed on the lifting trolley 2. The two winch mechanisms 21 are symmetrically distributed on the left and right sides of the main beam 1. The wire ropes 22 of the two winch mechanisms 21 are connected to a lifting device 23 by a balanced winding and rope threading method.

[0048] When the bridge erecting machine is in operation, two lifting trolleys work together to lift a T-beam, with a total of four lifting points on the two trolleys. The winch mechanisms 21 on both the front and rear lifting trolleys are balanced lifting point mechanisms, using a balanced winding rope method: the two ends of a steel wire rope come out from both sides of the double drum, enter their respective moving pulley groups and fixed pulley groups, and are then wound together through the left and right balanced pulley groups, so that the forces on the left and right pulley groups are balanced, forming a balanced lifting point; the symmetrical sides of the lifting trolleys have the same arrangement and winding method. Due to the use of the same structure and the addition of a frequency converter, the steel wire rope on the same lifting trolley is ensured to descend or rise synchronously, thereby ensuring the balanced lifting and lowering of the lifting device; the winch mechanism 21 is driven by a motor to drive the coupling, gearbox, and built-in planetary gear reducer, which drives the drum with the steel wire rope wound on it. By controlling the forward and reverse rotation of the motor, the lifting and lowering of the T-beam can be achieved. Figure 11 The image shows a front view of the hoisting mechanism. The drums in the hoisting mechanism have spiral grooves for regularly arranged ropes. The rope grooves on the drums of the two hoisting trolleys are manufactured and installed symmetrically, and the rope grooves on both sides of the same double drum are also symmetrical. Each double drum has a rope capacity of 142 meters, and there are four drums in total.

[0049] The structure of main support leg 3 is referenced. Figure 1 , Figure 4 as well as Figure 7 and Figure 8There are two main support legs 3, connected to the front and rear sections of the main beam 1 respectively. The main support leg 3 has an overall "U" shape, including two C-shaped half-legs. The tops of the two half-legs are hinged to the left and right sides of the main beam, respectively, and the two half-legs can rotate horizontally to fold with the main beam under the drive of the folding mechanism. Each half-leg is equipped with a telescopic column 33. The half-leg includes a first main beam connecting seat 31, an upper crossbeam 32, a telescopic column 33, and a lower crossbeam 34. The first main beam connecting seat 31 is fixed to the upper side of the main beam with bolts. The upper crossbeam 32 is hinged to the first main beam connecting seat 31 through a vertical pin 35. The telescopic column 33 connects the upper crossbeam 32 and the lower crossbeam 34. The telescopic column 33 includes an outer column 331 and an inner column 332, and a telescopic cylinder 333 is installed between the two. The lower crossbeam 34 is hinged to the traveling frame 41 through a vertical pin 35. The folding mechanism includes a folding cylinder (not shown in the figure), which is installed between the upper crossbeam 32 and the first main beam connecting seat 31. The inner column 332 has pin holes 334 evenly distributed from top to bottom, and the bottom of the outer column 331 also has corresponding pin holes 334. Pins 335 are installed in the pin holes 334. The inner column 332 extends and retracts inside the outer column 331 and is locked / unlocked by the pins 335. When the main support leg needs to extend and retract to adjust its height, the pin is pulled out, the extension cylinder drives the main support leg to extend and retract, and the pin is immediately inserted after the height adjustment is completed to lock the inner and outer columns.

[0050] The structure of the running wheel set 4 is referenced. Figure 4 and Figure 7 As shown, there are also two sets of traveling wheels 4. The traveling wheel set 4 includes a traveling frame 41 and traveling wheels 42. The left and right sides of the traveling frame 41 are respectively hinged to the bottom of two C-shaped half legs. The traveling wheels 42 are installed below the traveling frame 41. The traveling wheel set 4 is used to drive the entire beam replacement machine to travel.

[0051] Structural reference of auxiliary outrigger 5 Figure 1 , Figure 9 and Figure 10As shown, there are two in total, which are respectively connected to the front section and the rear section of the main beam and are located outside the two main legs 3. The auxiliary leg 5 is provided with a flipping mechanism for controlling the overall vertical flipping of the auxiliary leg to be parallel to the main beam, and a lifting mechanism for controlling the overall up and down lifting of the auxiliary leg. The auxiliary leg 5 is composed of two single legs, and the two single legs are respectively fixed on the left and right sides of the main beam 1. The single leg includes a second main beam connecting seat 51, a lifting column 52 and a support seat 53. The second main beam connecting seat 51 is fixed on the side surface of the upper part of the main beam by bolts. The top end of the lifting column 52 is hinged to the second main beam connecting seat 51 through a horizontal pin shaft 54, and the bottom end of the lifting column 52 is fixedly connected to the support seat 53. The lifting mechanism includes a lifting oil cylinder 55. The two ends of the lifting oil cylinder 55 are respectively connected inside the lifting column 52, and the overall lifting of the auxiliary leg 5 is controlled by the lifting of the lifting oil cylinder 55. The flipping mechanism includes an upper flipping seat 56, a lower flipping seat 57 and a flipping oil cylinder 58. The upper flipping seat 56 is fixedly connected to the second main beam connecting seat 51, the lower flipping seat 57 is fixedly connected to the lifting column 52, the top end of the flipping oil cylinder 58 is hinged to the upper flipping seat 56, and the bottom end is hinged to the lower flipping seat 57.

[0052] The working steps of the simply supported T-beam beam-changing machine for railways provided in this embodiment include three parts: traveling, passing through tunnels, and beam-changing.

[0053] Beam-changing machine traveling: In the actual construction process of the beam-changing machine in this embodiment, the whole machine travels from the beam yard along the existing railway tracks to the beam section to be replaced by means of self-traveling, and returns to the beam yard by means of self-traveling after the beam-changing is completed. During the traveling and transportation process, the whole machine is in a low position, and during the beam-changing process, the whole machine is in a high position. The switching between the traveling condition and the beam-changing condition can be achieved by switching between high position and low position, which is realized by the telescoping of the main legs. Figure 2 and Figure 5 That is the structural schematic diagram of the beam-changing machine in the traveling state. As can be seen from the figure, Figure 2 and Figure 5 the telescoping columns in the main legs have been in a fully retracted state, and its overall height has dropped to the lowest. During the telescoping process of the main legs (i.e., the high position / low position switching), the auxiliary legs support the whole beam-changing machine; during the self-traveling process of the beam-changing machine, the auxiliary legs are in an overall flipped state.

[0054] Beam-changing machine passing through tunnels: The overall shape of the main legs in this embodiment is "square", and its internal width is greater than the width of a single simply supported T-beam for railways. Therefore, the width of the main legs is relatively large, as shown in Figure 4 ; if there is a tunnel between the beam yard and the construction site, since the width of the main legs is greater than the width of the tunnel, it is necessary to use a folding mechanism to fold the two C-shaped half legs inward to make them parallel to the main beam. By folding, the width of the main legs can be greatly reduced, so that the whole beam-changing machine can pass through the tunnel smoothly. Figure 3 and Figure 6 This diagram illustrates the main outriggers folded during tunnel passage. As shown, the two C-shaped half-legs are folded horizontally at 90 degrees, significantly reducing the width of the main outriggers and allowing for smooth passage through the tunnel. During the folding process, auxiliary outriggers support the entire beam-changing machine. As the machine travels through the tunnel after folding, the auxiliary outriggers are in a flipped-over state.

[0055] Beam replacement machine beam replacement: The beam replacement process requires the cooperation of two beam transport vehicles 6, one to transport the old simply supported T-beams 7 that have been removed, and the other to transport the new simply supported T-beams 7 from the beam yard to the construction site. After the beam replacement machine finishes its low-position travel, when switching to the beam replacement state, the main support leg needs to be extended. At this time, the auxiliary support leg supports the entire beam replacement machine, lifting the main support leg off the ground. Then, the pin on the telescopic column is pulled out, and the telescopic cylinder drives the main support leg to extend. After the height adjustment is completed, the pin is immediately inserted to lock the inner and outer columns. Then, the auxiliary support leg is rotated as a whole until the entire beam replacement construction process is completed. The beam replacement construction steps are as follows: Figures 12-19 As shown (the auxiliary support leg is in a flipped state and is not shown in the figure), the details are as follows:

[0056] (S1) Lifting T-beams by front and rear crane trolleys: The front and rear crane trolleys lift the beams synchronously. When the beam is about to be in place, attention should be paid to the distance between the beam end and the beam transport vehicle (the feeding speed should be reduced when the beam is about 1m away from the end of the beam transport vehicle).

[0057] (S2) Beam-carrying trolley connection: The beam-carrying trolley drives into the bottom of the simply supported T-beam, the center of the platform is 1.3m away from the beam end, the lifting cylinder descends to the lowest position, so that the beam is placed on the beam-carrying trolley, and the beam lifting operation is completed.

[0058] (S3) The beam-carrying trolley and the rear crane trolley connect the beam synchronously: The rear crane trolley and the beam-carrying trolley connect the beam synchronously. When the beam connection is about to be completed, the trolley should run at low speed.

[0059] (S4) Synchronous beam movement of front and rear beam-carrying trolleys: After the front and rear beam-carrying trolleys move the beams to their positions, the beam transport vehicle carries the dismantled simply supported T-beams back to the storage location.

[0060] (S5) Lifting the front trolley beam: When lifting the beam, ensure that the distance between the first end of the lifting beam and the center of the rear main support leg is less than 3.5m, and the distance between the centers of the front and rear trolleys is about 3.5m.

[0061] (S6) Rear crane trolley lifting beam: After the rear crane trolley lifts the beam, disconnect the control connection line between the beam transport vehicle and the bridge erecting machine. (S7) Synchronous beam feeding: The front and rear crane trolleys lift the beam synchronously. During the beam lifting process, the running speed of the front and rear crane trolleys is kept consistent. After the front crane trolley approaches the position to be erected, the speed is reduced.

[0062] (S8) Lowering the beam: When lowering the beam, attention should be paid to the gap between the front and rear ends of the simply supported T-beam and the front main support leg and the already erected beam; at the same time, attention should be paid to the levelness of the four corners of the simply supported T-beam, and the longitudinal and transverse deviation of the beam should not exceed 10‰.

[0063] After the beam is lowered, the beam replacement machine completes the entire beam replacement operation and switches to a low-position traveling state with the support of auxiliary outriggers. Then, the beam replacement machine travels back to the beam yard or the next beam replacement site. At the same time, the construction personnel install and debug the track and electrical equipment on the newly replaced simply supported T-beam in order to restore the railway line to normal operation as soon as possible.

Claims

1. A railway simply supported T-beam beam replacement machine, comprising at least a main beam and a power system, an electro-hydraulic control system, and a driver's cab mounted on the main beam, characterized in that: The main beam is provided with the following: Two lifting trolleys are installed on the main beam and move along the main beam. Two main legs are respectively connected to the front and rear sections of the main beam. The main legs are provided with telescopic columns and folding mechanisms for controlling the horizontal rotation of the main legs to be folded with the main beam. Two traveling wheel sets are installed below the main legs and are used to drive the whole beam-changing machine to travel. Two auxiliary legs are respectively connected to the front and rear sections of the main beam and are located outside the two main legs. The auxiliary legs are provided with a flipping mechanism for controlling the overall vertical flipping of the auxiliary legs to be parallel to the main beam, and a lifting mechanism for controlling the overall up-and-down lifting of the auxiliary legs.

2. The railway simply supported T-beam beam replacement machine according to claim 1, characterized in that: The main beam adopts a single-main-beam box structure. The single main beam is divided into 4 segments, and each segment is a welded box structure. The segments are connected by high-strength bolts. Tracks for the lifting trolley to move are provided on the side of the lower cover plate of the main beam, and tracks for the lifting trolley to move are also provided above the lug beam of the main beam.

3. The railway simply supported T-beam beam replacement machine according to claim 1, characterized in that: The overall structure of the main leg is in the shape of a "mouth", including two C-shaped half legs. The tops of the two half legs are respectively hinged to the left and right sides of the main beam, and the two half legs can be horizontally rotated to be folded with the main beam under the drive of the folding mechanism.

4. The railway simply supported T-beam beam replacement machine according to claim 1, characterized in that: The traveling wheel set includes a traveling frame and traveling wheels. The left and right sides of the traveling frame are hinged to the bottom of the main leg, and the traveling wheels are installed below the traveling frame. The traveling wheel set is used to drive the whole beam-changing machine to travel.

5. The railway simply supported T-beam beam replacement machine according to claim 3, characterized in that: The half leg includes a first main beam connecting seat, an upper cross beam, a telescopic column and a lower cross beam. The first main beam connecting seat is fixed on the side of the upper part of the main beam by bolts. The upper cross beam is hinged to the first main beam connecting seat through a vertical pin shaft. The telescopic column is connected between the upper cross beam and the lower cross beam. The telescopic column includes an outer column and an inner column, and a telescopic oil cylinder is installed between them. The lower cross beam is hinged to the traveling frame in the traveling wheel set through a vertical pin shaft.

6. The railway simply supported T-beam beam replacement machine according to claim 5, characterized in that: The folding mechanism includes a folding oil cylinder, which is installed between the upper cross beam and the first main beam connecting seat.

7. The railway simply supported T-beam beam replacement machine according to claim 5, characterized in that: The inner column is uniformly provided with pin holes from top to bottom, and the bottom of the outer column is also correspondingly provided with pin holes, and pins are arranged in the pin holes.

8. The railway simply supported T-beam beam replacement machine according to claim 1, characterized in that: The auxiliary leg is composed of two single legs, which are respectively fixed on the left and right sides of the main beam. The single leg includes a second main beam connecting seat, a lifting column and a support seat. The second main beam connecting seat is fixed on the side of the upper part of the main beam by bolts. The top of the lifting column is hinged to the second main beam connecting seat through a horizontal pin shaft, and the bottom end of the lifting column is connected and fixed to the support seat.

9. The railway simply supported T-beam beam replacement machine according to claim 8, characterized in that: The lifting mechanism includes a lifting oil cylinder, and both ends of the lifting oil cylinder are respectively connected inside the lifting column, and the overall lifting of the auxiliary leg is controlled by the lifting of the lifting oil cylinder.

10. The railway simply supported T-beam beam replacement machine according to claim 8, characterized in that: The flipping mechanism includes an upper flipping seat, a lower flipping seat and a flipping oil cylinder. The upper flipping seat is fixedly connected to the second main beam connecting seat, the lower flipping seat is fixedly connected to the lifting column, the top end of the flipping oil cylinder is hinged to the upper flipping seat, and the bottom end is hinged to the lower flipping seat.

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