A track-laying machine gantry structure that varies in span while in motion

Abstract

This invention discloses a track-laying machine gantry structure with variable span during movement, comprising a main beam, with a swing-span variable span mechanism, columns, and a traveling beam at each of the four corners of the main beam. One end of the swing-span variable span mechanism is hinged to the main beam, and the other end is hinged to the upper part of the column. The traveling beam is located at the lower part of the column. The swing-span variable span mechanism includes a swing rotating seat and a variable span cylinder. One end of the swing rotating seat is hinged to the side of the main beam parallel to the track-laying machine's travel direction, and the other end is hinged to the upper part of the column. The two ends of the variable span cylinder are respectively located on the swing rotating seat and the side of the main beam perpendicular to the track-laying machine's travel direction. The extension and retraction of the variable span cylinder adjusts the distance between the columns on both sides of the main beam along the track-laying machine's travel direction. This swing-span variable span method ensures both the transport of the entire machine and adaptability to construction needs with different spans.

Description

Technical Field

[0001] This invention relates to the field of track construction technology, and specifically to a track-laying machine gantry structure that can change its span while moving. Background Technology

[0002] With the continuous construction of subway lines and the expansion of the subway construction market in China, the level of mechanization in subway construction is also increasing. Therefore, the amount of equipment used in subway construction, especially in track laying, is also growing. Currently, two main methods are used in domestic subway track laying construction: one is the replacement method using rail-mounted track laying machines; the other is the reverse laying method using new tire-mounted track laying machines. To complete track laying and track bed pouring within the subway, both the rail-mounted and tire-mounted track laying machines used in these two methods employ a gantry structure capable of spanning tracks and adjusting height. This gantry structure generally consists of a main beam, columns, and traveling beams.

[0003] Currently, many domestic manufacturers mainly use two methods to achieve track laying machine span variation.

[0004] One method involves using a double-box girder guide sleeve and guide column telescopic structure on the upper crossbeam of the track laying machine, coupled with a screw and nut or hydraulic cylinder drive device. The trolley traveling beam is equipped with transverse wheels, and the entire machine is lowered onto a temporary transverse track using a low-position, short-distance temporary jacking method. For example, Chinese Patent Application No. CN201410065674.X discloses a low-position jacking rapid transverse span-changing device and method for a track laying machine. The upper screw and nut drive device of the track laying machine drives the guide sleeve to slide along the guide column of the upper crossbeam, causing the transverse wheels at the bottom of the traveling beam of the outrigger assembly to roll along the temporary transverse track, thus achieving span change.

[0005] Another method uses a guide column type upper crossbeam and upper crossbeam guide sleeve sliding mechanism in the track laying machine. The top of the outrigger is bolted to the upper crossbeam guide sleeve, and the bottom of the outrigger is fixed to the traveling beam. A sensor is installed on the side of the running track at both ends of the traveling beam. The drive motor of the lateral movement mechanism is fixed to the longitudinal beam of the outrigger. One end of the lead screw is connected to the drive motor, and the other end is screwed into the hinged nut on the guide column type upper crossbeam. The distance to the track is detected by the sensors, thereby controlling the guide sleeve sliding mechanism to automatically change the span during movement under the drive of the drive motor and the lead screw. For example, Chinese patent application number CN201610905799.8 discloses an automatic span-changing device and method for track laying machines during movement. Both methods use an inner and outer sleeve type main beam span-changing mechanism as the support structure for span changing. This structure mainly achieves span changing by changing the overlap length of the inner and outer sleeves through the extension and retraction of the hydraulic cylinder or the rotation of the lead screw structure. This span-changing structure has the following problems:

[0006] (1) The structure is limited in size and cannot simultaneously meet the requirements of transporting the whole machine and large span;

[0007] (2) After the sleeve structure changes the span, the inner and outer sleeves need to have a certain overlap length, which is generally not less than 500mm. The sleeve length cannot be fully utilized.

[0008] (3) The gap between the inner and outer sleeves will cause the main beam structure to deflect more;

[0009] (4) The sleeve structure is large in size and weight;

[0010] (5) The span adjustment is inconvenient and requires an auxiliary support frame to lift the whole machine and suspend the door legs and traveling mechanism.

[0011] (6) Changing the span while moving is only applicable to rail-mounted track laying machines. Tire-mounted track laying machines can only change the span while stationary.

[0012] The existing track-laying machine adopts a gantry structure with a sleeve-type variable span mechanism, which mainly consists of three parts: the main beam, the column, and the traveling beam. The main beam is the main variable span mechanism of the track-laying machine, which is mainly divided into two parts: one part is the hydraulic cylinder or screw device used to drive the variable span, and the other part is the sleeve structure used for load-bearing.

[0013] First, as a load-bearing structure, the sleeve structure requires strong structural strength, which in turn requires the sleeve to have thicker walls and a larger cross-sectional height, resulting in a larger size and weight of the sleeve structure.

[0014] Secondly, because the sleeve structure is a nested form of inner and outer sleeves, its stiffness and strength are less than that of a single continuous beam when the sleeve is extended and a load is lifted. Furthermore, due to deformation under stress after being lifted, the inner and outer sleeves become two lines of contact, one of which is directly at the end of the outer sleeve. Therefore, a certain overlap length is required between the inner and outer sleeves, and the weld at the end of the outer sleeve is prone to cracking. Thirdly, when the required span is too large, both the inner and outer sleeves need to be lengthened, and their overlap length after the span change should also be appropriately increased. This results in an excessively wide equipment, which cannot meet the requirements for transporting complete machines on highways. Conversely, if the requirements for transporting complete machines on highways are to be met, the length of the sleeve structure is limited, making it unsuitable for large spans.

[0015] Finally, since the direction of movement of the sleeve-type variable span mechanism is perpendicular to the direction of rolling of the tire or steel wheel, when performing variable span operation, in order to prevent friction between the tire or steel wheel or reduce the resistance of variable span, it is necessary to stop the machine, lift the column and traveling mechanism and suspend them in the air, which requires an auxiliary support frame. Summary of the Invention

[0016] To address the aforementioned shortcomings of existing technologies, a track-laying machine gantry structure with variable span during movement is provided. This structure employs a rotating span-changing method, which can both ensure the transportation of the entire machine and adapt to construction needs for different spans.

[0017] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows:

[0018] A track-laying machine gantry structure with variable span during travel is characterized by: including a main beam, with a swing-span variable mechanism, a column, and a traveling beam provided at each of the four corners of the main beam; one end of the swing-span variable mechanism is hinged to the main beam, and the other end of the swing-span variable mechanism is hinged to the upper part of the column; the traveling beam is located at the lower part of the column.

[0019] The swing-and-span adjustment mechanism includes a swing-and-span rotating seat and a swing-and-span adjustment cylinder. One end of the swing-and-span rotating seat is hinged to the side of the main beam parallel to the direction of travel of the track laying machine, and the other end of the swing-and-span rotating seat is hinged to the upper part of the column. The two ends of the swing-and-span adjustment cylinder are respectively located on the swing-and-span rotating seat and the side of the main beam perpendicular to the direction of travel of the track laying machine. The distance between the columns on both sides of the main beam along the direction of travel of the track laying machine is adjusted by the extension and retraction of the swing-and-span adjustment cylinder.

[0020] According to the above technical solution, the hinged connection between the swing rotating seat, the column, and the main beam is designed as a detachable structure, and various specifications of swing rotating seats are designed, with the appropriate swing rotating seat selected according to the range of span and strength requirements.

[0021] According to the above technical solution, the column or main beam and the swing rotating seat are hinged together using a hinged joint. The hinged joint includes a sliding sleeve, a fixed seat, a rotating shaft, an end cap, and a nut assembly. Parallel and vertically downward through holes are provided on both sides of the swing rotating seat. The through holes are divided into a limiting section in the middle and sliding sleeve connecting sections on both sides. The sliding sleeve is located in the sliding sleeve connecting section of the through hole, and the end cap is located on the outside of the sliding sleeve and fixed to the end of the through hole. The fixed seat is located on the column or main beam, and the inner diameter of the sliding sleeve and the fixed seat matches the outer diameter of the rotating shaft. The two rotating shafts pass through the end caps of the sliding sleeves on both sides of the swing rotating seat and the fixed seat, respectively. The nut assembly is located at the end of the rotating shaft.

[0022] According to the above technical solution, the fixed seat includes an upper fixed seat and a lower fixed seat, which are located above and below the sliding sleeve, respectively. The rotating shaft passes through the upper fixed seat, the sliding sleeve and the lower fixed seat in sequence.

[0023] According to the above technical solution, a sliding pad is provided between the end cover and the fixed seat, and the inner diameter of the sliding pad matches the outer diameter of the rotating shaft.

[0024] According to the above technical solution, the rotating shaft includes a support rod section and an end head. The outer diameter of the straight rod section matches the inner diameter of the sliding sleeve and the fixed seat. The end head is located at one end of the straight rod section, and the size of the end head is larger than the outer diameter of the straight rod section.

[0025] According to the above technical solution, the column includes a column cylinder, a column outer sleeve, and a column inner sleeve. The top of the column inner sleeve is located inside the bottom of the column outer sleeve in a way that allows it to slide up and down only. The two ends of the column cylinder are fixed to the outer walls of the column inner sleeve and the column outer sleeve, respectively. One side of the swing-swing mechanism is hinged to the top of the column outer sleeve, and the traveling beam is located on the lower outer side of the column inner sleeve.

[0026] According to the above technical solution, a strut is provided between the columns on both sides of the main beam along the running direction of the track laying machine, and the two ends of the strut are fixed on the columns.

[0027] According to the above technical solution, the main beam includes the main beam body and the main beam end beams. The main beam end beams are fixed on the side of the main beam body that is perpendicular to the direction of travel of the track laying machine.

[0028] According to the above technical solution, variable span cylinder seats are fixedly provided on both the main beam and the swing rotation seat. The fixed position of the variable span cylinder seats is set according to the usage requirements. Hinged ear plates are provided at both ends of the variable span cylinder. The two ends of the variable span cylinder are hinged to the variable span cylinder seats through the hinged ear plates.

[0029] The present invention has the following beneficial effects:

[0030] 1. A swing-span variable-span mechanism is installed between the columns and the main beam. The extension and retraction of the variable-span hydraulic cylinders located between each column and the main beam control the angle between the swing-rotating seat and the main beam. Since the length of the swing-rotating seat is fixed, the distance between the main beam and the columns changes accordingly when the angle between the swing-rotating seat and the main beam changes, thus adapting to construction requirements of different spans. In existing technologies, hydraulic cylinders (or inner and outer sleeve structures) are placed between the main beam and the columns, with the cylinders (or inner and outer sleeve structures) acting as the load-bearing components of the main beam, and the columns moving laterally closer to the main beam. Compared to the prior art, this application uses a swing-rotating seat as the load-bearing component, and the variable-span hydraulic cylinders drive the swing-rotating seat to swing relative to the main beam to achieve the variable-span action. Compared to existing technologies, the load-bearing capacity of this application is significantly improved.

[0031] In addition, since this application uses a rotating and variable span method to achieve the gantry structure, the required direction of wheel movement and the direction of wheel rolling are the same during the variable span process; when the wheel brake is released, the track laying machine can complete the variable span action at the same time as the wheel contacts the ground (i.e., without the need for auxiliary support frame for auxiliary support).

[0032] 2. The swing rotating seat adopts a detachable connection method, which is not only convenient to disassemble and transport later, but also allows for the selection of appropriate swing rotating seats according to needs, which can significantly improve the load-bearing capacity and reliability of the gantry structure and adapt to the construction needs of different spans.

[0033] 3. Install sliding pads between the end cap and the fixed seat to reduce friction between the swinging rotating seat and the fixed seat at the column outer sleeve and the main beam end beam, respectively. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the gantry assembly provided in an embodiment of the present invention;

[0035] Figure 2 This is a schematic diagram of the swing-variable span mechanism provided in an embodiment of the present invention;

[0036] Figure 3 This is a detailed drawing of the swing-span variable-span mechanism according to an embodiment of the present invention;

[0037] Figure 4 This is a top view of an embodiment provided by the present invention;

[0038] Figure 5 This is a front view of an embodiment provided by the present invention;

[0039] Figure 6 This is a partially enlarged view of the swinging variable span provided in the embodiment of the present invention;

[0040] In the diagram, 1. Main beam; 1-1. Main beam body; 1-2. Main beam end beam; 2. Swinging span-changing mechanism; 2-1. Swinging rotating seat; 2-2. Span-changing cylinder; 3. Column; 3-1. Column cylinder; 3-2. Column outer sleeve; 3-3. Column inner sleeve; 4. Traveling beam; 5. Sliding sleeve; 6. Fixed seat; 7. Rotating shaft; 8. End cover; 9. Nut assembly; 10. Sliding pad; 11. Support rod; 12. Span-changing cylinder seat. Detailed Implementation

[0041] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0042] Reference Figures 1-6 As shown, the present invention provides a track-laying machine gantry structure with variable span during travel, including a main beam 1, and a swing-span variable span mechanism 2, a column 3, and a traveling beam 4 at each of the four corners of the main beam. One end of the swing-span variable span mechanism is hinged to the main beam, and the other end of the swing-span variable span mechanism is hinged to the upper part of the column; the traveling beam is located at the lower part of the column.

[0043] The swing-span adjustment mechanism includes a swing-rotating seat 2-1 and a swing-span adjustment cylinder 2-2. One end of the swing-rotating seat is hinged to the side of the main beam parallel to the direction of travel of the track laying machine, and the other end of the swing-rotating seat is hinged to the upper part of the column. The two ends of the swing-span adjustment cylinder are respectively located on the swing-rotating seat and the side of the main beam perpendicular to the direction of travel of the track laying machine. The distance between the columns on both sides of the main beam along the direction of travel of the track laying machine is adjusted by the extension and retraction of the swing-span adjustment cylinder.

[0044] In this embodiment, a swing-span variable-span mechanism is installed between the columns and the main beam. The extension and retraction of the variable-span hydraulic cylinders located between each column and the main beam control the angle between the swing-rotating seat and the main beam. Since the length of the swing-rotating seat is fixed, the distance between the main beam and the columns changes accordingly when the angle between the swing-rotating seat and the main beam changes, thus adapting to construction requirements of different spans. In the prior art, hydraulic cylinders (or inner and outer sleeve structures) are placed between the main beam and the columns, with the cylinders (or inner and outer sleeve structures) acting as the load-bearing components of the main beam, and the columns moving laterally closer to the main beam. Compared to the prior art, this application achieves this through a rotating variable-span mechanism in the gantry structure. When the wheel brakes are released, the track-laying machine can complete the variable-span action simultaneously with the wheel contacting the ground, without the need for auxiliary support frames.

[0045] Furthermore, the hinged connection between the swing rotating seat, the column, and the main beam is designed as a detachable structure, and various specifications of swing rotating seats are designed, allowing for the selection of a suitable swing rotating seat based on the span range and strength requirements.

[0046] Because the gantry structure of this invention employs a swing-span variable-span mechanism, the size of the variable-span range is determined solely by the length and strength of the swing-rotating seat. The swing-span variable-span seat is designed in various specifications, allowing for easy disassembly of the columns, swing-span variable-span mechanism, and crossbeams to meet road transport requirements. In contrast, existing technologies require that when the required variable-span distance is too large, the cylinder (or inner and outer sleeve structure) needs to be lengthened, and its overlap length after the variable-span must also be appropriately increased. This results in excessively wide equipment, making it unsuitable for conventional transport vehicles to transport the entire machine on the road. Conversely, to meet the requirements for transporting the entire machine on the road, the length of the cylinder (or inner and outer sleeve structure) is limited, failing to meet the demands of large spans. Therefore, compared to existing technologies, this application ensures both the transport of the entire machine and adaptability to construction needs of different spans.

[0047] Specifically, the column or main beam and the swing-rotating seat are hinged together using a hinged joint. The hinged joint includes a sliding sleeve 5, a fixed seat 6, a rotating shaft 7, an end cap 8, and a nut assembly 9. Parallel and vertically downward through holes 10 are provided on both sides of the swing-rotating seat. The through holes are divided into a central limiting section and sliding sleeve connecting sections on both sides. The sliding sleeve is located within the sliding sleeve connecting section of the through hole, and the end cap is located on the outside of the sliding sleeve and fixed to the end of the through hole. Under the action of the limiting section in the middle of the through hole and the end cap, the sliding sleeve is confined within the sliding sleeve connecting section of the through hole, and can only rotate, not move axially. The fixed seat is located on the column or main beam, and the inner diameter of the sliding sleeve and the fixed seat matches the outer diameter of the rotating shaft. Two rotating shafts pass through the end caps of the sliding sleeves on both sides of the swing-rotating seat and into the fixed seat, respectively. The nut assembly is located at the end of the rotating shaft.

[0048] Furthermore, the fixed base includes an upper fixed base and a lower fixed base, which are located above and below the sliding sleeve, respectively. The rotating shaft passes through the upper fixed base, the sliding sleeve, and the lower fixed base in sequence. The position of the rotating shaft is restricted by the upper fixed base, the lower fixed base, and the nut assembly, allowing the sliding sleeve to rotate on the rotating shaft.

[0049] Furthermore, to reduce the friction between the swinging rotating seat and the fixed seat at the column outer sleeve and the main beam end beam, a sliding pad 10 is provided between the end cover and the fixed seat. The inner diameter of the sliding pad matches the outer diameter of the rotating shaft. The sliding pad acts as a lubricating pad between the sliding sleeve and the fixed seat to avoid generating large resistance when the sliding sleeve and the fixed seat rotate relative to each other.

[0050] Furthermore, the rotating shaft includes a support rod section and an end head. The outer diameter of the straight rod section matches the inner diameter of the sliding sleeve and the fixed seat. The end head is located at one end of the straight rod section, and the size of the end head is larger than the outer diameter of the straight rod section. The end head, together with the nut assembly, axially limits the rotating seat.

[0051] Specifically, the column includes a column cylinder 3-1, a column outer sleeve 3-2, and a column inner sleeve 3-3. The top of the column inner sleeve is located inside the bottom of the column outer sleeve via a sliding connection. The two ends of the column cylinder are fixed to the outer walls of the column inner sleeve and the column outer sleeve, respectively. One side of the swing-span mechanism is hinged to the top of the column outer sleeve, and the traveling beam is located on the lower outer side of the column inner sleeve. The height of the column is controlled by the extension and retraction of the column cylinder, thereby adjusting the height of the main beam.

[0052] Furthermore, a strut 11 is provided between the columns on both sides of the main beam along the running direction of the track laying machine, and the two ends of the strut are fixed to the columns. In the embodiment shown in the figure, the strut is provided on the outer wall of the outer sleeve of the column, but it can also be provided on the outer wall of the inner sleeve of the column; the number of struts is not limited to one, and the arrangement of the struts is not limited to horizontal, but can also be arranged at an angle.

[0053] Furthermore, the main beam includes the main beam body 1-1 and the main beam end beam 1-2, with the main beam end beam fixedly installed on the side of the main beam body perpendicular to the direction of travel of the track laying machine.

[0054] Furthermore, variable span cylinder seats 12 are fixedly provided on both the main beam and the swing rotating seat. The fixed position of the variable span cylinder seats is set according to the usage requirements. Hinged ear plates are provided at both ends of the variable span cylinder. The two ends of the variable span cylinder are hinged to the variable span cylinder seats through the hinged ear plates, thereby realizing the hinged connection between the variable span cylinder and the main beam and the swing rotating seat at the same time.

[0055] Working principle of the invention:

[0056] like Figures 4-6As the front span-changing cylinder of the track-laying machine retracts, the rear span-changing cylinder extends. Under the simultaneous action of the two cylinders, the two swing rotating seats connected to the front and rear span-changing cylinders rotate counterclockwise. Since the outer sleeves of the front and rear columns on the same side are welded together by structural steel, the column will achieve translation under the action of the two swing rotating seats. Since the length of the swing rotating seats does not change, the translation of the column can be decomposed into movement in two directions: forward and inward. The simultaneous movement of the columns on both sides of the track-laying machine achieves the span change of the track-laying machine.

[0057] The main uses of this invention are:

[0058] The main beam of this device is the main load-bearing structure of the track laying machine. The power system, hydraulic system, and the lateral winch mechanism of the hoisting mechanism are installed in the middle of the main beam. Each hoisting mechanism is divided into two groups of lateral winches, and each group of lateral winches has two sets of hoisting winches. Therefore, each track laying machine has a total of 4 winches. Each winch is connected to four lifting points (under the main beam and in the middle of the span) of the lifting device through steel wire ropes.

[0059] The device has a tire-based traveling mechanism installed at the bottom of the traveling beam, which enables the track-laying machine to travel and turn on level ground.

[0060] The track laying machine, consisting of this device, traveling mechanism, power system, hydraulic system and lifting mechanism, is mainly used for track laying construction on elevated sections of urban rail transit. This track laying machine can lift 18-meter track panels with a single unit.

[0061] The above are merely preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. Therefore, any equivalent changes made in accordance with the claims of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A track-laying machine gantry structure with variable span during movement, characterized in that: The main beam includes a swing-span mechanism, a column, and a traveling beam at each of its four corners. One end of the swing-span mechanism is hinged to the main beam, and the other end is hinged to the upper part of the column. The traveling beam is located at the lower part of the column. The swing-span mechanism includes a swing-rotating seat and a swing-span cylinder. One end of the swing-rotating seat is hinged to the side of the main beam parallel to the direction of travel of the track laying machine, and the other end of the swing-rotating seat is hinged to the upper part of the column. The two ends of the variable span cylinder are respectively located on the swing rotating seat and the side of the main beam perpendicular to the direction of travel of the track laying machine. The extension and retraction of the variable span cylinder realizes the adjustment of the spacing between the columns on both sides of the main beam along the direction of travel of the track laying machine. Support rods are installed between the columns on both sides of the main beam along the running direction of the track laying machine, and the two ends of the support rods are fixed to the columns.

2. The track-laying machine gantry structure with variable span during travel as described in claim 1, characterized in that: The hinged connection between the swing rotating seat, the column, and the main beam is designed as a detachable structure, and various specifications of swing rotating seats are designed to select the appropriate swing rotating seat according to the range of span and strength requirements.

3. The track-laying machine gantry structure with variable span during travel as described in claim 1 or 2, characterized in that: The column or main beam and the swing rotating seat are hinged together using a hinged joint. The hinged joint includes a sliding sleeve, a fixed seat, a rotating shaft, an end cap, and a nut assembly. Parallel and vertically downward through holes are provided on both sides of the swing rotating seat. The through holes are divided into a limiting section in the middle and sliding sleeve connecting sections on both sides. The sliding sleeve is located in the sliding sleeve connecting section of the through hole, and the end cap is located on the outside of the sliding sleeve and fixed to the end of the through hole. The fixed seat is located on the column or main beam, and the inner diameter of the sliding sleeve and the fixed seat matches the outer diameter of the rotating shaft. The two rotating shafts pass through the end caps of the sliding sleeves on both sides of the swing rotating seat and the fixed seat, respectively. The nut assembly is located at the end of the rotating shaft.

4. The track-laying machine gantry structure with variable span during travel as described in claim 3, characterized in that: The fixed base includes an upper fixed base and a lower fixed base, which are located above and below the sliding sleeve, respectively. The rotating shaft passes through the upper fixed base, the sliding sleeve, and the lower fixed base in sequence.

5. The track-laying machine gantry structure with variable span during travel as described in claim 3, characterized in that: A sliding pad is provided between the end cap and the fixed seat, and the inner diameter of the sliding pad matches the outer diameter of the rotating shaft.

6. The track-laying machine gantry structure with variable span during travel as described in claim 3, characterized in that: The rotating shaft includes a support rod section and an end head. The outer diameter of the straight rod section matches the inner diameter of the sliding sleeve and the fixed seat. The end head is located at one end of the straight rod section, and the size of the end head is larger than the outer diameter of the straight rod section.

7. The track-laying machine gantry structure with variable span during travel as described in claim 3, characterized in that: The column includes a column cylinder, a column outer sleeve, and a column inner sleeve. The top of the column inner sleeve is located inside the bottom of the column outer sleeve in a way that allows it to slide up and down only. The two ends of the column cylinder are fixed to the outer walls of the column inner sleeve and the column outer sleeve, respectively. One side of the swing-swing mechanism is hinged to the top of the column outer sleeve, and the traveling beam is located on the lower outer side of the column inner sleeve.

8. The track-laying machine gantry structure with variable span during travel as described in claim 3, characterized in that: The main beam consists of the main beam body and the main beam end beams. The main beam end beams are fixed on the side of the main beam body that is perpendicular to the direction of travel of the track laying machine.

9. The track-laying machine gantry structure with variable span during travel as described in claim 3, characterized in that: Both the main beam and the swing rotating seat are fixedly equipped with variable span cylinder seats, and the fixed position of the variable span cylinder seats is set according to the usage requirements; hinged lugs are provided at both ends of the variable span cylinder, and the two ends of the variable span cylinder are hinged to the variable span cylinder seats through the hinged lugs.

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