Foldable beam changing machine

Abstract

The present invention relates to the field of bridge frame replacement, and in particular to a foldable beam replacement machine. It includes a guide beam, a first driving mechanism and a first limiting mechanism. A pair of beam lifting trolleys for lifting and moving beam pieces are arranged at the lower end of the guide beam. The two ends of the guide beam are respectively hinged with legs. Each leg includes a moving trolley arranged below the guide beam and a support arm respectively hinged with the guide beam and the moving trolley. The support arm is provided with a beam hole for the beam piece to pass through. The first driving mechanism is used to drive the support arm to swing relative to the guide beam and the moving trolley to realize the lifting and lowering of the guide beam. The first limiting mechanism is used to limit the swing of the support arm. The present application can adjust the state of the guide beam and the moving trolley by controlling the swing of the support arm. When the guide beam is being transported, the guide beam is located at a low position and supported on the moving trolley, so it can be conveniently transported. When the equipment needs to work, the guide beam can be quickly switched to a high position, so as to facilitate the lifting and moving of the beam piece, and the construction efficiency is high.

Description

Technical Field

[0001] The invention relates to the field of bridge frame replacement, and in particular to a foldable beam replacement machine. Background Art

[0002] With the increase in the operating time of railways and highways in my country, the aging of bridges has an increasingly prominent impact on the safety of existing lines (already built lines). Some bridges that were built not long ago have to be replaced because their strength or stiffness cannot meet the requirements due to the continuous speed increase of existing lines, especially the main trunk lines, and the need to pass heavy-load trains. Due to the poor manufacturing and installation quality of some bridges, some diseased bridges are also produced every year.

[0003] In addition, my country used a large number of steel beams in the construction of railways in the past. The service life of these steel beams is significantly lower than that of concrete beams, and the maintenance workload of steel beams is very large. In some places, maintenance is simply impossible, which also causes some steel beams to need to be replaced before they reach their strength life. Therefore, it is urgent to study one or several safe and reliable methods for replacing existing railway bridges for different bridge forms.

[0004] At present, the existing railway line bridge replacement methods in my country include fully closed existing line bridge replacement method and intermittent closed existing line bridge replacement method.

[0005] The idea of ​​fully enclosed beam replacement is to build a temporary temporary line or bridge near the existing railway bridge; the train passes on the temporary line or bridge, and the bridge is replaced by a bridge-building machine. This operation mode does not need to interrupt the traffic and is suitable for bridges in rivers or valleys, but it requires the construction of temporary lines or bridges, which is costly and time-consuming. When the train passes the temporary line (temporary bridge), the speed must be limited. When the temporary line is connected to the main line and the main line is connected to the main line, point construction is required. At the same time, the line is frequently disturbed, resulting in instability of the roadbed and ballast bed. Therefore, the speed limit time is long, which has a great impact on the punctual operation of the train; the construction and removal of temporary lines has a great impact on the environment.

[0006] The idea of ​​intermittent closure for beam replacement is to adjust the train operation diagram or the gap between train operations and use gantry cranes or bracket transverse movement to implement bridge replacement operations. This operation mode does not require the construction of a bypass line, is low-cost, and has no environmental pollution; the preparation time is short, and the bridge replacement work can be carried out in a shorter time; the disturbance to the existing line is small, and normal operation can be restored in a shorter time after the replacement is completed. The preparation work is carried out offline and does not interfere with the existing line, but it cannot be applied to bridges in valleys or above rivers. Since there is no bypass line for vehicles to bypass when intermittently closing the existing line for bridge replacement, the safety and reliability of the equipment and the length of the closure time become the top priorities of this plan.

[0007] In order to solve the above problems, it is urgent to propose a new set of railway beam bridge replacement construction technology and equipment that can be applied to various pier heights or terrain and topography under the bridge, provide new ideas and methods for bridge replacement projects, and ensure that the replacement construction of the entire span beam can be completed safely and efficiently within the "window point" under the premise of minimum interference to the original line equipment. Summary of the invention

[0008] The object of the present invention is to provide a foldable beam changing machine to at least solve some of the technical problems mentioned in the background technology.

[0009] In order to achieve the above object, the present invention adopts the following technical solutions:

[0010] A foldable beam changing machine comprises a guide beam, a first driving mechanism and a first limiting mechanism. A pair of beam lifting trolleys for lifting and moving beam pieces are arranged at the lower end of the guide beam. Legs are hinged at both ends of the guide beam. Each leg comprises a moving trolley arranged below the guide beam and a support arm hinged to the guide beam and the moving trolley respectively. A beam hole is arranged on the support arm for the beam piece to pass through. The first driving mechanism is used to drive the support arm to swing relative to the guide beam and the moving trolley to realize the lifting and lowering of the guide beam. The first limiting mechanism is used to limit the swinging of the support arm.

[0011] Preferably, the supporting leg and the guide beam form a first rotation axis, the supporting leg and the moving trolley form a second rotation axis, and the first rotation axis and the second rotation axis are in a horizontal state and perpendicular to the length direction of the guide beam.

[0012] Preferably, each support arm includes a first rotating shaft, a second rotating shaft and a pair of supporting units. The first rotating shaft is rotatably set on the guide beam, and the second rotating shaft is rotatably set on the moving trolley. The first rotating shaft and the second rotating shaft are connected through a pair of supporting units. The cross beam hole is formed between the pair of supporting units. The first rotating shaft and the second rotating shaft are horizontally arranged and perpendicular to the length direction of the guide beam.

[0013] Preferably, a first connecting seat is provided at each of the two first rotating shafts on the guide beam, a second connecting seat is provided at each of the two second rotating shafts on the moving trolley, rotating shaft holes are provided on the first connecting seat and the second connecting seat, and the first rotating shaft and the second rotating shaft are rotatably connected in the corresponding rotating shaft holes.

[0014] Preferably, the first connecting seat is connected to a third driving mechanism, and the first connecting seat moves along the length direction of the first rotating shaft through the third driving mechanism.

[0015] Preferably, the first limiting mechanism is a first pin shaft, and the corresponding first connecting seat and the first rotating shaft are provided with a pin hole for inserting the first pin shaft, and the first driving mechanism is a telescopic rod, one end of the telescopic rod is hinged to the supporting unit, and the other end of the telescopic rod is hinged to the third connecting seat arranged on the guide beam or the moving trolley.

[0016] Preferably, the first connecting seat is arranged at the upper end of the guide beam, and first extension sections are arranged at both ends of the guide beam.

[0017] Preferably, each support unit includes a pair of first support parts and a second support part, the pair of first support parts are respectively arranged on the end parts on the same side of the first rotating shaft and the second rotating shaft and are respectively hinged to the corresponding first rotating shaft and the second rotating shaft, the ends of the two first support parts away from the guide beam are connected by the second support part, the support unit is connected with a second driving mechanism and a second limiting mechanism, the second driving mechanism is used to drive the first support part to swing relative to the guide beam and the moving trolley to adjust the distance of the second support part relative to the guide beam and the moving trolley, and the second limiting mechanism is used to limit the swing of the first support part.

[0018] Preferably, the third connecting seat is arranged on the mobile trolley, one end of the telescopic rod is hinged to the second supporting part, the other end of the telescopic rod is hinged to the third connecting seat, and a rotating shaft hole is provided at the connection between the third connecting seat and the telescopic rod, and the third connecting seat and the telescopic rod are hinged by a pluggable pin shaft arranged in the rotating shaft hole.

[0019] Preferably, the third connecting seat is arranged on the guide beam, one end of the telescopic rod is hinged to the first hinge seat arranged on the second support part, a rotating shaft hole is opened at the connection between the first hinge seat and the telescopic rod, and the first hinge seat and the telescopic rod are hinged by a pluggable pin shaft arranged in the rotating shaft hole.

[0020] Beneficial effects: The present application can adjust the status of the guide beam and the mobile trolley by controlling the swing of the support arm. When the guide beam is being transported, the guide beam is located in a low position and is supported on the mobile trolley, so it is convenient for transportation. When the equipment needs to work, the guide beam can be quickly switched to a high position, thereby facilitating the lifting and movement of the beam piece, and the construction efficiency is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the equipment in place in the present invention.

[0022] Figure 2 It is a schematic diagram of the guide beam being raised and unfolded in the present invention.

[0023] Figure 3 It is a schematic diagram of dismantling the old beam in the present invention.

[0024] Figure 4 It is a schematic diagram of the installation of the new beam in the present invention.

[0025] Figure 5 It is a schematic diagram of the removal of the equipment in the present invention.

[0026] Figure 6 It is a schematic diagram of the present invention placed on the beam piece.

[0027] Figure 7 It is a structural schematic diagram of the third connecting seat in the present invention being arranged on the moving trolley.

[0028] Figure 8 It is a structural schematic diagram of the support arm in the present invention.

[0029] Fig. 9 It is a structural schematic diagram of the support unit in the present invention.

[0030] Fig.10 It is a schematic diagram of a transportation state of one of the present invention.

[0031] Fig.11 It is a schematic structural diagram of the third connecting seat arranged on the guide beam in the present invention.

[0032] Fig.12 It is a schematic diagram of the low-position structure when the guide beam is in a transport state in one embodiment of the present invention.

[0033] Fig.13 It is a schematic structural diagram of an embodiment of the present invention in which the guide beam is located at a high position.

[0034] Fig.14 It is a structural schematic diagram of an embodiment of the present invention in which a swing arm drives a telescopic rod to lift.

[0035] Reference numerals:

[0036] 1. Guide beam; 101. First connecting seat; 102. First extension section; 2. Moving trolley; 201. Second connecting seat; 301. First rotating shaft; 302. Second rotating shaft; 303. First supporting part; 304. Second supporting part; 305. Third rotating shaft; 306. Second extension section; 401. First driving mechanism; 402. First limiting mechanism; 501. Second driving mechanism; 502. Second limiting mechanism; 601. First beam transport train; 602. Second beam transport train; 7. Beam lifting trolley; 8. Third connecting seat; 801. First articulated seat; 802. Second articulated seat; 803. Rotating shaft; 804. Swing arm; 805. Force block; 806. Limiting block; 807. Winch; 808. Connecting rod; 9. Third driving mechanism. DETAILED DESCRIPTION

[0037] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. The specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. Based on the described embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art belong to the scope of protection of the present invention.

[0038] See also Figure 6-9 The present application provides a foldable beam changing machine, including a guide beam 1, a first driving mechanism 401 and a first limiting mechanism 402. A pair of beam lifting trolleys 7 for lifting and moving beam pieces are arranged at the lower end of the guide beam 1. Support legs are hinged at both ends of the guide beam 1, and each support leg includes a moving trolley 2 arranged under the guide beam 1 and a support arm hinged to the guide beam 1 and the moving trolley 2 respectively. The support arm is provided with a beam hole for the beam piece to pass through. The first driving mechanism 401 is used to drive the support arm to swing relative to the guide beam 1 and the moving trolley 2 to realize the lifting and lowering of the guide beam 1. The first limiting mechanism 402 is used to limit the swing of the support arm.

[0039] In the present scheme, the guide beam 1 is a strip structure, and its length direction is consistent with the length direction of the bridge. It is supported by the legs at both ends and is arranged above the hole to be replaced. A pair of beam trolleys 7 are arranged at the lower end of the guide beam 1. The beam trolley 7 is the existing technology. The beam trolley 7 is movably connected with the guide beam 1. The beam trolley 7 is provided with a walking mechanism and a lifting mechanism. The walking mechanism can be used to walk along the length direction of the guide beam 1, and the lifting mechanism can be used to lift heavy objects. Therefore, the beam trolley 7 can lift the beam piece and transfer it. During the transfer process, the beam piece passes through the support arm through the beam hole.

[0040] The support arms are hinged to the guide beam 1 and the mobile trolley 2 respectively, so under the action of external force, the support arms can realize the swing function. Before transportation, preferably, the initial state of the two support arms is in a retracted state and parallel to each other. When the mobile trolley 2 moves to the existing bridge on both sides of the hole to be replaced, the support arms are controlled to swing up. It should be emphasized that because the support arms are parallel to each other, the swinging directions of the support arms are consistent at this time, which can drive the guide beam 1 to rise above the hole to be replaced. In the above process, the mobile trolley 2 can be limited in advance on the existing bridge, so that during the rising process of the guide beam 1, only the guide beam 1 and the support arm move, while the mobile trolley 2 remains stable, which can optimize the construction progress to the greatest extent.

[0041] As an alternative, before transportation, the two support arms can also swing to the ends close to each other, and under the drive of the support arms, the mobile trolley 2 at the bottom of the two support arms also approaches each other. At this time, the guide beam 1 can be placed on the mobile trolley 2 and moved along the bridge direction under the drive of the mobile trolley 2. When the guide beam 1 is moved to the top of the hole to be replaced, the support arms swing to the ends away from each other, and under the drive of the support arms, the mobile trolley 2 at the bottom of the two support arms also moves away from each other. With the continuous swinging of the support arms, the guide beam 1 is continuously raised until it can provide construction space for the construction of the beam trolley 7. In this process, the mobile trolley 2 also moves to the existing bridge adjacent to the hole to be replaced due to the distance between each other, so as not to interfere with the removal of the old beam by the beam trolley 7. More preferably, one of the mobile trolleys 2 can be limited on the existing bridge in advance, and the other mobile trolley 2 moves accordingly. The mobile trolley can also be connected to the corresponding beam transport special train and powered by the beam transport special train.

[0042] As another alternative, before transportation, the two support arms may also be swung to ends away from each other, which will not be described in detail here.

[0043] Since the guide beam 1, the support arm and the mobile trolley 2 are movably connected and unstable, after the support arm is unfolded, the positional relationship between them needs to be constrained by the first limit mechanism 402. The constraint method can be conventional technical means to ensure that the guide beam 1, the support arm and the mobile trolley 2 do not rotate, such as setting a support, a pin, etc. The swing of the support arm can be driven by the first drive mechanism 401, which can act on the guide beam 1 and the support arm or the mobile trolley 2 and the support arm. By adjusting the swing of the support arm relative to the guide beam 1 or the mobile trolley 2, the guide beam 1 can be lifted and lowered. For example, the first drive mechanism 401 can be a motor, which drives the rotation of the hinge shaft between the guide beam 1, the support arm and the mobile trolley 2 to achieve the swing of the support arm. The first drive mechanism 401 can also be a telescopic mechanism, which adjusts the angle of the support arm with the guide beam 1 or the support arm by telescoping to achieve the angle of the support arm, etc.

[0044] In order to enhance the supporting effect of the mobile trolley 2 on the supporting arm, a hydraulic mechanism may be provided at the bottom end of the mobile trolley 2 corresponding to the position of the supporting arm, and a pad may also be provided on the existing bridge corresponding to the hydraulic mechanism. When the mobile trolley 2 is in place, the hydraulic mechanism at its bottom is extended and pressed against the pad, thereby effectively improving the supporting strength of the mobile trolley 2.

[0045] In this solution, the guide beam 1 is located in a low position during transportation, so it is convenient for transportation. When work is required, it can be quickly switched to a high position, thereby facilitating the lifting and movement of the beam pieces and achieving high construction efficiency.

[0046] The supporting leg and the guide beam 1 form a first rotation axis, and the supporting leg and the moving trolley 2 form a second rotation axis. The first rotation axis and the second rotation axis are in a horizontal state and perpendicular to the length direction of the guide beam 1.

[0047] In this solution, the support leg and the guide beam 1 form a first rotation axis, and the support leg and the moving trolley 2 form a second rotation axis. The above-mentioned rotation axis is the swing center of the guide beam 1 and does not represent the actual rotation axis. By limiting the swing direction of the guide beam 1, the vertical rise or fall of the guide beam 1 can be completed, which is beneficial to the overall stability of the structure.

[0048] See also Figure 8 Each support arm includes a first rotating shaft 301, a second rotating shaft 302 and a pair of supporting units. The first rotating shaft 301 is rotatably set on the guide beam 1, and the second rotating shaft 302 is rotatably set on the moving vehicle 2. The first rotating shaft 301 and the second rotating shaft 302 are connected through a pair of supporting units, and a cross beam hole is formed between the pair of supporting units. The first rotating shaft 301 and the second rotating shaft 302 are horizontally arranged and perpendicular to the length direction of the guide beam 1.

[0049] In this solution, the specific structure of the support arm is disclosed. By setting the first rotating shaft 301 and the second rotating shaft 302, the support unit can swing relative to the guide beam 1 and the moving trolley 2. Under the supporting action of the support unit, the guide beam 1 can also be supported, and beam holes can be formed between the support units to facilitate the passage of the beam sheet.

[0050] A first connecting seat 101 is provided at each location on the guide beam 1 corresponding to the two first rotating shafts 301, and a second connecting seat 201 is provided at each location on the moving trolley 2 corresponding to the two second rotating shafts 302. Rotating shaft holes are provided on the first connecting seat 101 and the second connecting seat 201. The first rotating shaft 301 and the second rotating shaft 302 are rotatably connected in the corresponding rotating shaft holes. The first limiting mechanism 402 is used to limit the rotation of the first rotating shaft 301, and the first driving structure is used to drive the supporting unit to swing relative to the second connecting seat 201.

[0051] In this solution, a first connecting seat 101 and a second connecting seat 201 are provided, and a hinged connection between the first connecting seat 101 and the second connecting seat 201 and the first rotating shaft 301 and the second rotating shaft 302 is realized, which can effectively enhance the overall stability of the structure.

[0052] The first connecting seat 101 is connected to a third driving mechanism, and the first connecting seat 101 moves along the length direction of the first rotating shaft 301 through the third driving mechanism.

[0053] In this embodiment, a third driving mechanism is provided, under the drive of the third driving mechanism, the first connecting seat 101 can move along the length direction of the first rotating shaft 301, that is, the guide beam 1 is driven to move along the length direction of the first rotating shaft 301, so when erecting the beam on a curve, the position of the guide beam 1 can be properly adjusted. That is, the center line of the guide beam 1 can be adjusted, so as to complete the precise placement of the beam on the curve line.

[0054] The third driving mechanism can be implemented by using relatively conventional existing equipment, for example, by using a hydraulic cylinder to push the first connecting seat 101 .

[0055] The first limiting mechanism 402 is a first pin shaft, and the corresponding first connecting seat 101 and the first rotating shaft 301 are provided with pin holes for inserting the first pin shaft. The first driving mechanism 401 is a telescopic rod, one end of the telescopic rod is hinged to the supporting unit, and the other end of the telescopic rod is hinged to the third connecting seat 8 arranged on the guide beam 1 or the moving trolley 2.

[0056] In this solution, the first limit mechanism 402 and the first driving mechanism 401 are specifically disclosed. By inserting the first pin into the pin hole, the relative rotation between the first connecting seat 101 and the first rotating shaft 301 can be effectively limited, thereby limiting the swing of the support arm. The first driving mechanism 401 is a telescopic rod, and the other end of the telescopic rod is hinged to the third connecting seat 8 set on the guide beam 1 or the moving trolley 2, which can effectively adjust the angle between the support arm and the guide beam 1 or the moving trolley 2, thereby driving the support arm to swing, and then realizing the lifting and lowering of the guide beam 1. It should be noted that the other ends of all telescopic rods should be uniformly hinged to the guide beam 1 or the moving trolley 2, and try to avoid the situation where some telescopic rods are connected to the guide beam 1 and some telescopic rods are connected to the moving trolley 2, so as to ensure the stability of the structure during operation.

[0057] The first connection seat 101 is arranged at the upper end of the guide beam 1 , and first extension sections 102 are arranged at both ends of the guide beam 1 .

[0058] In this solution, the first connecting seat 101 is arranged at the upper end of the guide beam 1 and will not affect the movement of the beam trolley 7 at the lower end of the guide beam 1. The first extension section 102 is arranged to increase the stroke of the beam trolley 7, thereby facilitating the movement of the beam piece.

[0059] See also Fig. 9Each support unit includes a pair of first support parts 303 and a second support part 304. The pair of first support parts 303 are respectively arranged on the ends on the same side of the first rotating shaft 301 and the second rotating shaft 302 and are respectively hinged to the corresponding first rotating shaft 301 and the second rotating shaft 302. The ends of the two first support parts 303 away from the guide beam 1 are connected through the second support part 304. The support unit is connected with a second driving mechanism 501 and a second limiting mechanism 502. The second driving mechanism 501 is used to drive the first support part 303 to swing relative to the guide beam 1 and the moving trolley 2 to adjust the distance between the second support part 304 and the guide beam 1 and the moving trolley 2. The second limiting mechanism 502 is used to limit the swing of the first support part 303.

[0060] In this solution, the structure of the support unit is specifically disclosed. By setting the first support part 303 and the second support part 304, the swing of the support unit relative to the guide beam 1 and the moving trolley 2 can be realized. Since the second support part 304 is arranged at an end away from the first support part 303, a recess is formed between the first support part 303 and the second support part 304, and a new beam hole is formed between the corresponding recesses to facilitate the passage of the beam sheet. The first support part 303 and the second support part 304 can both be rod-shaped and form a C-shaped structure. The first support part 303 is hinged with the first rotating shaft 301 and the second rotating shaft 302, so that the distance of the second support part 304 relative to the guide beam 1 and the moving trolley 2 can be controlled, that is, the length of the recessed part of the C-shaped structure in the direction perpendicular to the bridge is changed, thereby changing the width of the support arm in disguise, effectively avoiding the problem of exceeding the width limit of the tunnel or railway.

[0061] The second driving mechanism 501 can be used to drive the first supporting part 303 to swing relative to the guide beam 1 and the moving trolley 2, and the second limiting mechanism 502 can be used to limit the swing of the first supporting part 303, thereby effectively realizing the swing of the supporting unit. In order to avoid damage to the telescopic rod due to the swing of the supporting unit, before the supporting unit swings, one end of the telescopic rod is disassembled first, that is, the constraint between the telescopic rod and the guide beam 1 or the moving trolley 2 is released, and then the second driving mechanism 501 is used to control the swing of the supporting unit.

[0062] The third connecting seat 8 is arranged on the mobile trolley 2, one end of the telescopic rod is hinged to the second support part 304, and the other end of the telescopic rod is hinged to the third connecting seat 8. A rotating shaft hole is provided at the connection between the third connecting seat 8 and the telescopic rod, and the third connecting seat 8 and the telescopic rod are hinged by a pluggable pin shaft arranged in the rotating shaft hole.

[0063] In this solution, the connection relationship between the telescopic rod and the third connecting seat 8 is specifically disclosed. By setting a pluggable pin shaft, the pluggable pin shaft can be used as a rotating shaft to realize the swing between the support arm and the mobile trolley 2, and the power of the swing can be achieved by the extension and retraction of the telescopic rod. When the pluggable pin shaft is inserted or pulled out, it can also play the role of installation and disassembly between the third connecting seat 8 and the telescopic rod, and the structure is simple.

[0064] See also Figure 11-14 The third connection seat 8 is arranged on the guide beam 1, one end of the telescopic rod is hinged to the first hinge seat 801 arranged on the second support part 304, the connection between the first hinge seat and the telescopic rod is provided with a rotation axis hole, and the first hinge seat and the telescopic rod are hinged by a pluggable pin arranged in the rotation axis hole. The third connection seat 8 includes a second hinge seat 802 arranged at the top of the guide beam 1, a rotation shaft 803 arranged horizontally and perpendicular to the length direction of the guide beam 1 is rotatably connected in the second hinge seat, the rotation shaft 803 is driven to rotate by the fourth driving mechanism, swing arms 804 are fixed at both ends of the rotation shaft, and the other end of the telescopic rod is hinged to the corresponding swing arm 804.

[0065] In this embodiment, by providing a pluggable pin, the pluggable pin can be used as a rotating axis to achieve the swing between the support arm and the guide beam 1, and the power of the swing can be achieved by the extension and retraction of the telescopic rod. When the pluggable pin is inserted or pulled out, it can also play a role in the installation and disassembly between the second support part 304 and the telescopic rod.

[0066] During implementation, since both the first support portion 303 and the second support portion 304 can be rod-shaped and form a C-shaped structure, the second support portion 304 is located in the recessed portion of the C-shaped structure, and one end of the telescopic rod can be connected to the first hinge seat 801 on the second support portion 304. In order to increase the force arm of the telescopic rod during operation, the first hinge seat 801 can be arranged on the second support portion 304 near the lower end, so as to facilitate the telescopic rod to exert force. In this embodiment, when the guide beam 1 is not raised, the bottom end of the support unit can swing to the side close to the third connection seat 8, or can swing to the side away from the third connection seat 8. The following describes the bottom end of the support unit swinging to the side away from the third connection seat 8.

[0067] In the above state, the telescopic rod is farthest from the first articulated seat 801, and the telescopic rod is in an extended state. When the telescopic rod contracts, it can drive the support unit to swing toward the third connecting seat 8 until the support unit is in a vertical state. At this time, the guide beam 1 also completes the lifting.

[0068] After the guide beam 1 is raised, the support unit swings, so the constraints between the telescopic rod and the guide beam 1 or the moving vehicle 2 need to be released in advance. In this embodiment, the pluggable pin shaft can be pulled out from the first hinge seat 801.

[0069] As a preferred embodiment, the third connecting seat 8 includes a second articulated seat 802 arranged at the top of the guide beam 1, and a rotating shaft 803 arranged horizontally and perpendicular to the length direction of the guide beam 1 is rotatably connected in the second articulated seat. The rotating shaft 803 is driven to rotate by a fourth driving mechanism, and swing arms 804 are fixed at both ends of the rotating shaft, and the other ends of the telescopic rods are hinged to the corresponding swing arms 804.

[0070] Through the above arrangement, the fourth driving mechanism can drive the rotating shaft 803 to rotate, and then drive the swing arm 804 to rotate. After the swing arm 804 rotates, its lower end rises, so that it can avoid the hanging beam trolley 7, which can speed up the construction progress. In the process of the swing arm 804 rotating, it also drives the telescopic rod that has been released from the constraint of the support unit to move upward. As a more preferred solution, a hoisting suspension device such as a winch 807 can also be set on the third connecting seat 8, which can be used to lift the telescopic rod after being separated from the first articulated seat 801, thereby reducing damage to the telescopic rod and avoiding the telescopic rod from hindering the construction process.

[0071] In this embodiment, since the other end of the telescopic rod is hinged to the swing arm 804, the swing arm 804 will be subjected to a large pulling force or thrust during the movement of the telescopic rod. For example, when the guide beam 1 rises, the telescopic rod shortens, and the swing arm 804 will be subjected to a large pulling force. Therefore, a more preferred solution is to set a limit block 806 on the guide beam 1 to resist the external force from the telescopic rod.

[0072] In this embodiment, the rotating shaft 803 can be driven to rotate by the fourth driving mechanism. As an implementation mode, the fourth driving mechanism can also be a telescopic mechanism. A force block 805 is set on the rotating shaft 803 corresponding to the telescopic end of the telescopic mechanism. The telescopic end of the telescopic mechanism is connected to the force block 805, so that the rotating shaft 803 can be driven to rotate.

[0073] Driven by the third driving mechanism mentioned above, the first connecting seat 101 can move along the length direction of the first rotating shaft 301, that is, drive the guide beam 1 to move along the length direction of the first rotating shaft 301. Therefore, when erecting the beam on a curve, the position of the guide beam 1 can be properly adjusted. That is, the center line of the guide beam 1 can be adjusted, so as to complete the precise placement of the beam on the curve line.

[0074] In this embodiment, the second hinge seat 802 can be driven by the fifth driving mechanism to move laterally relative to the rotating shaft 803, thereby also achieving the above effect. The configuration of the fifth driving mechanism can refer to the third driving mechanism, and will not be described in detail here.

[0075] It should be noted that during transportation, the telescopic rod may be misaligned relative to the swing arm 804 and the second support portion 304, which may cause damage to the telescopic rod to a certain extent. Therefore, during transportation, the constraint between the telescopic rod and the first articulated seat 801 can be released first, and a connecting rod 808 can be set between the third connecting seat 8 and the telescopic rod to temporarily support the telescopic rod. After the transportation is completed, the constraint of the connecting rod 808 on the telescopic rod can be released, and the telescopic rod and the first articulated seat 801 can be reconnected.

[0076] Both ends of the first rotating shaft 301 and the second rotating shaft 302 are provided with a second extension section 306, and the second extension section 306 is provided with a rotating shaft hole perpendicular to the first rotating shaft 301 and the second rotating shaft 302, and the third rotating shaft 305 is rotatably connected in the rotating shaft hole, one end of the third rotating shaft 305 is connected to the corresponding first supporting portion 303, the second limiting mechanism 502 is a second pin shaft, and the corresponding second extension section 306 and the third rotating shaft 305 are provided with a pin hole for inserting the second pin shaft, the second driving mechanism 501 is a driving motor arranged on the second extension section 306, the driving motor is used to drive the third rotating shaft 305 to rotate in the rotating shaft hole in the second extension section 306, and the second driving mechanism 501 can also be a worm arranged on the second extension section 306, which is used to drive the worm wheel on the third rotating shaft 305 to rotate in the rotating shaft hole in the second extension section 306.

[0077] This solution discloses the swing and constraint structure of the support unit in relatively detail. Through the cooperation between the second extension section 306, the third rotating shaft 305 and the driving motor, the swing of the first support part 303 can be easily realized, and under the action of the second pin shaft, the swing of the support unit can be constrained.

[0078] The first pin shaft, the second pin shaft and the pluggable pin shaft are all electric pin shafts.

[0079] In this solution, the first pin shaft, the second pin shaft and the pluggable pin shaft are all electric pin shafts, which can realize the plugging and unplugging between them and the corresponding pin holes, thereby facilitating construction. For example, an electric pin shaft mechanism is arranged near the pin hole. The mechanism can utilize the conventional rack and pinion transmission principle, that is, under the drive of the motor, the gear is driven to rotate, and then the rack, i.e., the pin shaft, which cooperates with it, is driven to move, thereby realizing the plugging and unplugging of the pin shaft.

[0080] The device usage provided in this application is as follows:

[0081] First, preparations before construction are carried out. The rails and track strips at both ends of the beam to be replaced are cut. Since the equipment may occupy a certain limit after installation, it is necessary to rotate the contact network columns in the area across the beam to be replaced by 90 degrees and unplug the contact network.

[0082] A beam changing method with a foldable beam changing machine comprises the following steps:

[0083] See also Figure 1 Step 1: Support the guide beam 1 through a pair of mobile trolleys 2 and move it to the hole position to be replaced. The two ends of the guide beam 1 are respectively hinged with support arms, and the other ends of the two support arms are hinged with the adjacent mobile trolleys 2. The first beam transport train 601 moves to the existing bridge on one side of the guide beam 1, and the second beam transport train 602 transports the new beam to the existing bridge on the other side of the guide beam 1.

[0084] Among them, the two moving vehicles 2 are connected to the first beam transport train 601 and the second beam transport train 602 respectively, and the first beam transport train 601 and the second beam transport train 602 provide power to complete the movement of the guide beam 1.

[0085] The description that the first beam transport train 601 moves to one side of the guide beam 1 and the second beam transport train 602 moves to the other side of the guide beam 1 refers to the state after transportation, that is, the final landing position, and does not refer to the order of movement of the first beam transport train 601, the mobile trolley 2 and the second beam transport train 602. Preferably, the second beam transport train 602, the mobile trolley 2 and the first beam transport train 601 are arranged in sequence and enter the construction site synchronously to increase the landing efficiency.

[0086] Among them, in order to strengthen the supporting effect of the mobile trolley 2 on the supporting arm and optimize the force on the vehicle body and the lower beam span, a supporting mechanism can be set at the bottom end of the mobile trolley 2. The supporting mechanism can be a hydraulic device, and a pad can be set on the existing bridge corresponding to the hydraulic mechanism. When the mobile trolley 2 is in place, the hydraulic press device at its bottom is extended and pressed against the pad, reducing the pressure on the wheels of the trolley, thereby effectively improving the supporting strength of the mobile trolley 2.

[0087] See also Figure 2 , step 2, control the first driving mechanism 401 connected to the support arm to start working, the first driving mechanism 401 drives the support arm to swing relative to the guide beam 1 and the moving trolley 2, the upper end of the support arm lifts the guide beam to above the hole to be replaced, the lower end of the support arm is supported on the moving trolley located on the existing bridges on both sides of the hole to be replaced, and then the relative swing between the guide beam 1, the support arm and the trolley is limited by the first limiting mechanism 402;

[0088] It should be noted that, before the guide beam 1 enters the site, its support unit is in a retracted state, that is, the horizontal distance between the second support portion 304 and the guide beam 1 and the moving vehicle 2 is the smallest. At this time, viewed along the length direction of the guide beam, the plane where the first support portion 303 and the second support portion 304 are located is relatively inclined to the plane where the guide beam 1 is located, which can effectively reduce the top width of the overall structure. When the guide beam 1 needs to be raised, the support unit should be straightened so that the plane where the first support portion 303 and the second support portion 304 are located is perpendicular to the ground.

[0089] When the guide beam 1, the support arm and the trolley are limited, that is, when the guide beam 1 rises, the pluggable pin is pulled out from the corresponding pin hole, that is, the constraint between the telescopic rod and the guide beam 1 or the moving trolley 2 is released, and then the second driving mechanism 501 connected to the support unit, that is, the driving motor, is controlled to start working, and the driving motor drives the third rotating shaft 305 to rotate, thereby driving the first supporting part 303 to swing relative to the guide beam 1 and the moving trolley 2, so that the distance between the second supporting part 304 and the guide beam 1 and the moving trolley 2 increases, and when the notch width reaches the maximum state, the swing of the first supporting part 303 is limited by the second limiting mechanism 502, that is, the second pin is inserted into the pin hole of the third rotating shaft 305 and the second extension section 306. At this time, the equipment is ready.

[0090] It should be noted that in order to ensure the stability of the overall structure of the support unit when it is opened, the support units located on the two mobile carts 2 should be opened separately, that is, the support unit located on one of the mobile carts 2 should be opened first, and after it is limited, the support unit located on the other mobile cart 2 should be opened and limited.

[0091] See also Figure 3 Step 3: Use the two beam hoisting trolleys 7 on the guide beam 1 to cooperate with the two beam carrying trolleys on the first beam transport special train 601 to hoist the old beam onto the first beam transport special train 601;

[0092] The old beam at the hole to be replaced is lifted by two beam lifting trolleys 7, and the beam piece is driven to move toward the direction of the first beam transport train 601. The two beam carrying trolleys on the first beam transport train 601 move to a position close to the guide beam 1. The beam lifting trolley 7 close to the first beam transport train 601 lowers the end of the beam piece so that the beam piece is supported on the beam carrying trolley far away from the guide beam 1. The beam carrying trolley moves synchronously with the beam lifting trolley 7 far away from the first beam transport train 601 until the beam lifting trolley 7 far away from the first beam transport train 601 moves to a position close to the end of the guide beam 1, and lowers the beam piece so that the other end of the beam piece is supported on the beam carrying trolley close to the guide beam 1. After the two beam carrying trolleys drive the beam piece to move to the specified position on the first beam transport train 601, the first beam transport train 601 drives the beam piece to move to the beam piece placement area.

[0093] See also Figure 4Step 4: Use the two beam hoisting trolleys 7 on the guide beam 1 to cooperate with the two beam carrying trolleys on the second beam transport special train 602 to hoist the new beam to the hole position to be replaced.

[0094] The new beam for replacement is placed on two beam-carrying trolleys on the second beam-transporting train 602. The two beam-carrying trolleys are supported at both ends of the beam piece. The two beam-hoisting trolleys 7 move to the end of the guide beam 1 close to the second beam-transporting train 602. The end of the beam piece close to the guide beam 1 is hoisted by the beam-hoisting trolley 7 far away from the second beam-transporting train 602, and the beam piece moves toward the direction of the first beam-transporting train 601 synchronously with the beam-carrying trolley far away from the guide beam 1 until the second beam-carrying trolley moves to a position close to the end of the guide beam 1. The beam-hoisting trolley 7 close to the second beam-transporting train 602 hoists the beam piece. The two beam-hoisting trolleys 7 move at the lower end of the guide beam 1 and set the hoisted beam piece at the hole position to be replaced.

[0095] Step 5. The mobile trolley 2 drives the guide beam 1 to move above the next frame replacement hole. The first beam transport train 601 transports the dismantled old beam to the designated position and then returns to one side of the guide beam 1. The second beam transport train 602 transports the new beam to be replaced to the other side of the guide beam 1, and restarts the dismantling of the old beam and the installation of the new beam. Step 5 is repeated multiple times according to actual conditions.

[0096] See also Figure 5 It should be noted that in step five, in order to avoid the guide beam 1 exceeding the height limit of the bridge, before the mobile trolley 2 drives the guide beam 1 to move above the next frame-changing hole, the first limiting mechanism 402 is released from the restrictions between the guide beam 1, the support arm and the trolley, and the first driving mechanism 401 connected to the support arm is controlled to start working. The first driving mechanism 401 drives the support arm to swing relative to the guide beam 1 and the mobile trolley 2, so that the upper end of the support arm drives the guide beam 1 to be lowered to the top of the mobile trolley 2, that is, the descent of the guide beam 1 is completed, thereby avoiding the problem of exceeding the height limit.

[0097] In the above steps, if there is still a problem of exceeding the width limit, then before the guide beam 1 descends, the second drive mechanism 501 connected to the second support part 304, that is, the drive motor, is controlled to start working, and the second drive mechanism 501 drives the first support part 303 to swing relative to the guide beam 1 and the moving trolley 2 so that the distance between the second support part 304 and the guide beam 1 and the moving trolley 2 is reduced. At this time, the pluggable pin shaft is inserted into the corresponding pin hole, that is, the telescopic rod and the guide beam 1 or the moving trolley 2 are constrained, thereby facilitating the adjustment of the angle between the telescopic rod and the support arm and the guide beam 1 or the moving trolley 2.

[0098] When the construction is completed, the support unit is retracted, the height of the guide beam 1 is lowered, and the equipment can be withdrawn in sequence.

[0099] Finally, the cut rails will be welded, the ballast will be filled, and the ballast will be tamped using a tamping vehicle, the contact network will be restored, and the bridge replacement work will be completed.

[0100] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A foldable beam changing machine, characterized in that: It comprises a guide beam, a first driving mechanism and a first limiting mechanism, wherein a pair of beam trolleys for lifting and moving beam pieces are arranged at the lower end of the guide beam, legs are hinged at both ends of the guide beam, each of the legs comprises a moving trolley arranged below the guide beam and a support arm hinged to the guide beam and the moving trolley respectively, a beam hole for the beam piece to pass through is arranged on the support arm, the first driving mechanism is used to drive the support arm to swing relative to the guide beam and the moving trolley to realize the lifting and lowering of the guide beam, and the first limiting mechanism is used to limit the swing of the support arm; The support leg and the guide beam form a first rotation axis, the support leg and the moving trolley form a second rotation axis, the first rotation axis and the second rotation axis are in a horizontal state and perpendicular to the length direction of the guide beam; Each of the support arms comprises a first rotating shaft, a second rotating shaft and a pair of supporting units, the first rotating shaft is rotatably arranged on the guide beam, the second rotating shaft is rotatably arranged on the moving trolley, the first rotating shaft and the second rotating shaft are connected through the pair of supporting units, the cross beam hole is formed between the pair of supporting units, the first rotating shaft and the second rotating shaft are horizontally arranged and perpendicular to the length direction of the guide beam; The guide beam is provided with a first connection seat at the two positions corresponding to the first rotation shafts, and the movable trolley is provided with a second connection seat at the two positions corresponding to the second rotation shafts. The first connection seat and the second connection seat are provided with rotation shaft holes, and the first rotation shaft and the second rotation shaft are rotatably connected in the corresponding rotation shaft holes. The first connecting seat is connected to a third driving mechanism, and the first connecting seat moves along the length direction of the first rotating shaft through the third driving mechanism; The first limiting mechanism is a first pin shaft, and the corresponding first connecting seat and the first rotating shaft are provided with a pin hole for inserting the first pin shaft. The first driving mechanism is a telescopic rod, one end of the telescopic rod is hinged to the supporting unit, and the other end of the telescopic rod is hinged to the third connecting seat arranged on the guide beam or the moving trolley.

2. A foldable beam changing machine according to claim 1, characterized in that: The first connecting seat is arranged at the upper end of the guide beam, and first extension sections are arranged at both ends of the guide beam.

3. The foldable beam changing machine according to claim 1, characterized in that: Each of the support units includes a pair of first support parts and a second support part, the pair of first support parts are respectively arranged on the end parts on the same side of the first rotating shaft and the second rotating shaft and are respectively hinged to the corresponding first rotating shaft and the second rotating shaft, the ends of the two first support parts away from the guide beam are connected through the second support part, the support unit is connected with a second driving mechanism and a second limiting mechanism, the second driving mechanism is used to drive the first support part to swing relative to the guide beam and the moving trolley to adjust the distance of the second support part relative to the guide beam and the moving trolley, and the second limiting mechanism is used to limit the swing of the first support part.

4. The foldable beam changing machine according to claim 3, characterized in that: The third connecting seat is arranged on the mobile trolley, one end of the telescopic rod is hinged to the second supporting part, and the other end of the telescopic rod is hinged to the third connecting seat, and a rotating shaft hole is provided at the connection between the third connecting seat and the telescopic rod, and the third connecting seat and the telescopic rod are hinged by a pluggable pin shaft arranged in the rotating shaft hole.

5. The foldable beam changing machine according to claim 3, characterized in that: The third connecting seat is arranged on the guide beam, one end of the telescopic rod is hinged to the first hinge seat arranged on the second support part, a rotating shaft hole is opened at the connection between the first hinge seat and the telescopic rod, and the first hinge seat and the telescopic rod are hinged by a pluggable pin shaft arranged in the rotating shaft hole.

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