Prefabricated sleeper of railway ballast track and automatic sleeper replacing device
By embedding pre-embedded bolts and spiral spikes under the rails, combined with an automated sleeper replacement device using laser ranging radar and a hydraulic robotic arm, the problem of low sleeper replacement efficiency on ballast tracks has been solved, achieving an efficient and safe sleeper replacement process and ensuring the stability and smoothness of the track.
Patent Information
- Application Number
- CN202610173460.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-02-06
- Publication Date
- 2026-03-31
AI Technical Summary
The replacement of sleepers on existing ballast tracks relies mainly on manual labor, which leads to low efficiency, makes it difficult to meet the demand for large-scale sleeper replacement, and manual operation is prone to damaging sleepers and track components.
The system employs prefabricated sleepers and an automated sleeper-changing device. Reliable fixing is achieved by embedding pre-embedded bolts and spiral spikes under the rails. Precise alignment is achieved by combining laser ranging radar with a hydraulic robotic arm and sleeper-changing mechanism for automated disassembly and installation. Clamping plates and anti-slip pads ensure the stability of the sleepers, forming a closed-loop mechanized operation process.
This significantly improved the efficiency of sleeper replacement, reduced labor intensity, ensured the stability of sleeper connections and the smoothness of the track, avoided damage to the track caused by manual operation, and achieved standardization and continuity in sleeper replacement.
Smart Images
Figure CN121760253A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of track maintenance equipment, and more particularly to a prefabricated sleeper for ballast track and an automated sleeper replacement device. Background Technology
[0002] Due to its convenient track laying, good vibration reduction performance, and low maintenance cost, ballasted railway track is widely used in conventional railway main lines, station lines, and some intercity railway lines. As the core load-bearing component of ballasted track, precast concrete sleepers directly determine the smoothness, stability, and service safety of the track. However, during long-term operation, sleepers are easily affected by factors such as repeated impacts from train wheels, ballast wear and compression, changes in outdoor temperature and humidity, and geological settlement, which can lead to defects such as cracks, spalling, loosening of fastener sleeves, and sleeper settlement and deformation. When the defects exceed the allowable range of the specifications, sleepers need to be replaced in time to ensure the safe operation of the line. Sleeper replacement has become a core procedure in the daily maintenance and major overhaul of ballasted railway track. Currently, the existing methods for replacing sleepers on ballast tracks are still mainly manual, resulting in low efficiency and difficulty in meeting the large-scale sleeper replacement needs of major railway overhauls. Summary of the Invention
[0003] Purpose of the invention: The purpose of this invention is to provide a solution to the problems described in the background art.
[0004] Technical solution: A prefabricated sleeper and an automated sleeper replacement device for ballast track of railway, comprising a sleeper body, rails symmetrically arranged on the upper surface of the sleeper body, a moving car body arranged on the upper surface of the two rails, a hydraulic robotic arm arranged on the left side of the moving car body, and a sleeper replacement mechanism arranged at the bottom end of the hydraulic robotic arm.
[0005] Furthermore, the upper surface of the sleeper body and below the two rails are provided with grooves, and the lower surface of the two grooves and on both sides of the two rails are embedded with pre-embedded bolts. The outer side walls of the pre-embedded bolts are provided with fixing components, and the outer side walls of the pre-embedded bolts and above the fixing components are threaded with spiral spikes.
[0006] Furthermore, the pillow changing mechanism includes an operating plate, and a torque mechanism is provided on the lower surface of the operating plate and above the plurality of pre-embedded bolts. A laser ranging radar is embedded in the front and rear surfaces of the operating plate.
[0007] Furthermore, the mobile vehicle body includes a mobile base plate, a rotating platform is provided on the upper surface of the mobile base plate, a control box is fixedly connected to the upper surface of the rotating platform, and the right side of the hydraulic robotic arm is fixedly connected to the left side of the rotating platform.
[0008] Furthermore, the operating panel has an actuation cavity inside, and a motor is fixedly connected to the front surface of the actuation cavity. A control screw is fixedly connected to the rear end of the output shaft of the motor. A through-type transverse groove is opened on the lower surface of the actuation cavity. A movable plate is threaded to the outer wall of the control screw. A connecting block is fixedly connected to the lower surface of the movable plate. The lower surface of the connecting block passes through the transverse groove and is fixedly connected to a clamping box.
[0009] Furthermore, the clamping box has a clamping cavity inside. The left and right sides of the clamping cavity are rotatably connected to a bidirectional screw via a rotating shaft. The outer side wall of the bidirectional screw is symmetrically threaded with adjusting plates. The lower surface of the clamping cavity has a through-type transverse groove. The lower surfaces of the two adjusting plates are fixedly connected to connecting blocks. The lower surfaces of the two connecting blocks pass through the transverse groove and are fixedly connected to clamping plates. The left side of the clamping box is fixedly connected to a motor. The right end of the output shaft of the motor is fixedly connected to the left end of the bidirectional screw.
[0010] Furthermore, anti-slip pads are fixedly connected to the opposite sides of both clamping plates.
[0011] Beneficial effects: This invention, by creating grooves under the rails and embedding pre-embedded bolts, combined with the hierarchical connection structure of the fixing components and spiral spikes, forms a reliable fixing system between the rails and the sleeper body, ensuring the structural stability and connection firmness of the railway ballast track during daily operation. It also provides a standardized disassembly and assembly benchmark for automated sleeper replacement operations. The threaded engagement of the pre-embedded bolts and spiral spikes can precisely match the torque mechanism of the sleeper replacement mechanism, overcoming the problem of poor compatibility between traditional sleeper fasteners and automated equipment. This allows the sleeper body to meet both the track load-bearing requirements and the operational requirements of automated sleeper replacement. This invention, through the use of a laser ranging radar, can quickly and accurately align the sleeper replacement mechanism with the sleeper body to be replaced, ensuring precise matching between the torque mechanism and the spiral spikes. No manual calibration is required. Multiple torque mechanisms can simultaneously complete the automated disassembly and locking of the spiral spikes, replacing the traditional manual disassembly and assembly of fasteners. This significantly improves the efficiency of sleeper replacement preparation and subsequent fixing, while effectively reducing the labor intensity of manual disassembly and assembly and avoiding accidental damage to the sleeper body and track components caused by manual operation. This invention utilizes a dual-drive motor to propel two clamping plates in a symmetrical clamping manner. Combined with anti-slip pads on the clamping plates, this effectively increases the friction between the clamping plates and the sleeper body, preventing slippage and displacement during extraction, transfer, and installation, thus ensuring stability during sleeper movement. The elastic properties of the anti-slip pads also buffer the clamping pressure, preventing direct contact between the rigid clamping plates and the sleeper body, which could cause concrete chipping, cracking, or other structural damage, protecting the structural integrity of the sleeper body. Simultaneously, a single-drive motor controls the control screw to smoothly move the clamped sleeper body laterally, enabling slow extraction and precise placement of the sleeper. This reduces excessive disturbance to the surrounding ballast bed during operation, ensuring the safety and standardization of sleeper extraction and placement. The mobile vehicle of this invention can move freely along the rails, providing a continuous moving foundation for sleeper replacement operations. The rotating platform can drive the hydraulic robotic arm and sleeper replacement mechanism to rotate at multiple angles. The hydraulic robotic arm can complete multi-dimensional spatial position adjustment. The two work together to flexibly adapt to the spatial requirements of different operating sections such as main lines and curved sections of ballast tracks. It can also accurately adjust the working posture of the sleeper replacement mechanism according to the actual working conditions of the ballast bed, so as to achieve precise clamping, transfer and positioning installation of the new sleeper body, effectively ensuring the positional accuracy of the new sleeper after it is laid, and providing a basic guarantee for the smoothness of the track. This invention integrates multiple processes during sleeper replacement—including movement, precise alignment, fastener removal and installation, old sleeper extraction, new sleeper clamping and transport, new sleeper installation, and bolt tightening—into a closed-loop mechanized operation process through the coordinated operation of a moving vehicle, a hydraulic robotic arm, and a sleeper replacement mechanism. Each component works collaboratively to complete the entire sleeper replacement operation, eliminating the heavy reliance on manual labor and simple machinery inherent in traditional sleeper replacement work. This significantly improves the overall efficiency of sleeper replacement operations on ballasted railway tracks. Simultaneously, the precise mechanized operation throughout the process effectively ensures the construction quality of the sleeper replacement operation. The connection accuracy between the new sleeper and the rail, as well as the accuracy of the sleeper's placement, meet railway track operation standards, maintaining the smoothness and structural stability of the ballasted railway track after sleeper replacement. This invention is widely adaptable to various operational needs such as daily maintenance of ballasted railway tracks, replacement of damaged sleepers, and large-scale overhauls. Attached Figure Description
[0012] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the overall structure of the sleeper body of the present invention; Figure 3 This is a schematic diagram of the pillow-changing mechanism of the present invention; Figure 4 This is a side view of the cross-section of the pillow changing mechanism of the present invention; Figure 5 This is a front view structural schematic diagram of the cross-section of the pillow changing mechanism of the present invention.
[0013] In the diagram: 1. Sleeper body; 2. Rail; 3. Moving car body; 4. Hydraulic robotic arm; 5. Sleeper changing mechanism; 101. Groove; 102. Embedded bolt; 103. Fixing component; 104. Spiral spike; 301. Moving base plate; 302. Rotating platform; 303. Control box; 501. Operating panel; 502. Torque mechanism; 503. Laser ranging radar; 504. Actuating cavity; 505. Motor 1; 506. Control screw; 507. Cross groove 1; 508. Movable plate; 509. Connecting block 1; 510. Clamping box; 511. Clamping cavity; 512. Bidirectional screw; 513. Adjusting plate; 514. Cross groove 2; 515. Connecting block 2; 516. Clamping plate; 517. Motor 2; 518. Anti-slip mat. Detailed Implementation
[0014] To make the technical solution of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0015] like Figures 1-5 As shown, a prefabricated sleeper and an automated sleeper replacement device for ballast track of railway are provided, including a sleeper body 1, rails 2 are symmetrically arranged on the upper surface of the sleeper body 1, a moving car body 3 is arranged on the upper surface of the two rails 2, a hydraulic mechanical arm 4 is arranged on the left side of the moving car body 3, and a sleeper replacement mechanism 5 is arranged at the bottom end of the hydraulic mechanical arm 4. The sleeper body 1 serves as the core load-bearing foundation of the ballasted track. Symmetrically arranged rails 2 on top of it provide stable track-type support for the mobile vehicle body 3. The mobile vehicle body 3 can move freely along the rails 2, enabling continuous sleeper replacement operations along the railway line without the need for an additional mobile base. It is adaptable to the spatial requirements of different operating sections, such as main lines and curved sections of ballasted track. The hydraulic robotic arm 4 mounted on the left side of the mobile vehicle body 3 can perform multi-dimensional spatial attitude and position adjustments. It can flexibly and precisely adjust the working position and angle of the sleeper replacement mechanism 5 at its bottom according to the actual working conditions of the ballasted track ballast bed, ensuring precise alignment between the sleeper replacement mechanism 5 and the sleeper body 1 to be replaced. After adjustment... The sleeper replacement mechanism 5 can directly remove the old sleeper and lay the new sleeper on the sleeper body 1. The device forms an integrated operation system from operation movement and precise alignment to sleeper replacement construction through the mechanized linkage of the moving car body 3, hydraulic mechanical arm 4 and sleeper replacement mechanism 5. The precise adjustment capability of the hydraulic mechanical arm 4 ensures the alignment accuracy between the sleeper replacement mechanism 5 and the sleeper body 1, reduces excessive disturbance to the ballast bed and structural damage to the sleeper body 1 during operation. The movement mode of the moving car body 3 along the rail 2 improves the mobility and continuity of the sleeper replacement operation, greatly improves the overall efficiency of sleeper replacement operation on ballast tracks, and significantly reduces the labor intensity of on-site construction personnel.
[0016] like Figures 2-5As shown, grooves 101 are provided on the upper surface of the sleeper body 1 and below the two rails 2. Embedded bolts 102 are embedded and fixedly connected on the lower surface of the two grooves 101 and on both sides of the two rails 2. Fixing components 103 are provided on the outer side walls of the multiple embedded bolts 102. Spiral spikes 104 are threadedly connected to the outer side walls of the multiple embedded bolts 102 and above the multiple fixing components 103. The pillow changing mechanism 5 includes an operation plate 501. Torque mechanisms 502 are provided on the lower surface of the operation plate 501 and above multiple pre-embedded bolts 102. Laser ranging radars 503 are embedded in the front and rear surfaces of the operation plate 501. The grooves 101 on the upper surface of the sleeper body 1 corresponding to the two rails 2 provide a stable installation space for the embedded bolts 102 that are fixedly connected to the lower surface of the sleeper body 1 and located on both sides of the rails 2. This effectively improves the connection stability between the embedded bolts 102 and the sleeper body 1. The fixing components 103 on the outer wall of the embedded bolts 102, together with the spiral spikes 104 connected to them (each spiral spike 104 is equipped with a flat washer below it), form a reliable fixing structure between the rails 2 and the sleeper body 1, ensuring the structural stability of the daily operation of the ballast track. Torque mechanisms 502 are arranged on the lower surface of the operating plate 501 of the sleeper replacement mechanism 5 at the positions of multiple embedded bolts 102. This can accurately match the disassembly and assembly requirements of the spiral spikes 104. The laser ranging radars 503 embedded on the front and rear surfaces of the operating plate 501 can achieve precise spatial alignment between the sleeper replacement mechanism 5 and the sleeper body 1 to be replaced, ensuring the precise matching of the torque mechanism 502 and the spiral spikes 104. Once the sleeper replacement mechanism 5 is precisely positioned above the sleeper body 1 to be replaced via the laser ranging radar 503, multiple torque mechanisms 502 can simultaneously perform automated disassembly of multiple spiral spikes 104. After disassembly, the fixing components 103, spiral spikes 104, and flat pads can be easily removed manually, completely releasing the fixed constraints between the rail 2 and the sleeper body 1 to be replaced. This clears the structural obstacles for the smooth removal of the sleeper body 1, thus ensuring the reliability of the connection between the rail 2 and the sleeper body 1 during daily railway operation. Furthermore, the combination of precise laser alignment and automated torque disassembly replaces the traditional manual disassembly and assembly of fasteners, significantly improving the efficiency and alignment accuracy of fastener disassembly in the early stages of sleeper replacement. At the same time, it simplifies the process of removing fastener components, reduces the labor intensity of manual operation, and makes the pre-disassembly preparation work of the sleeper body 1 more efficient and convenient.
[0017] like Figures 3-5As shown, the operating plate 501 has an actuation cavity 504 inside. A motor 505 is fixedly connected to the front surface of the actuation cavity 504. A control screw 506 is fixedly connected to the rear end of the output shaft of the motor 505. A through-type transverse groove 507 is opened on the lower surface of the actuation cavity 504. A movable plate 508 is threadedly connected to the outer wall of the control screw 506. A connecting block 509 is fixedly connected to the lower surface of the movable plate 508. The lower surface of the connecting block 509 passes through the transverse groove 507 and is fixedly connected to a clamping box 510. The clamping box 510 has a clamping cavity 511 inside. The left and right sides of the clamping cavity 511 are rotatably connected to a bidirectional screw 512 via a rotating shaft. The outer side wall of the bidirectional screw 512 is symmetrically threaded with an adjusting plate 513. The lower surface of the clamping cavity 511 has a through-type transverse groove 514. The lower surfaces of the two adjusting plates 513 are fixedly connected to a connecting block 515. The lower surfaces of the two connecting blocks 515 pass through the transverse groove 514 and are fixedly connected to a clamping plate 516. The left side of the clamping box 510 is fixedly connected to a motor 517. The right end of the output shaft of the motor 517 is fixedly connected to the left end of the bidirectional screw 512. The actuation cavity 504 inside the control panel 501 provides a closed installation space for components such as the motor 505 and the control screw 506, ensuring stable operation of the transmission structure. After the motor 505 starts, it drives the control screw 506 at the rear end of the output shaft to rotate, which in turn drives the movable plate 508 connected to the outer wall to move horizontally along the actuation cavity 504 via threaded transmission. The transverse groove 507 on the lower surface of the actuation cavity 504 provides a lateral movement channel for the connecting block 509 on the lower surface of the movable plate 508, enabling the connecting block 509 to drive the clamping box 510 fixed below to move synchronously and smoothly, thus providing a stable surface for the sleeper body 1. The pull-out provides lateral driving force; the clamping cavity 511 inside the clamping box 510 provides an installation carrier for clamping components such as the bidirectional screw 512 and the adjusting plate 513. After the motor 517 on the left is started, it can drive the bidirectional screw 512 connected to the output shaft to rotate. The symmetrical thread structure of the bidirectional screw 512 drives the adjusting plates 513 on both sides to move in opposite directions. The transverse groove 514 on the lower surface of the clamping cavity 511 provides a moving space for the connecting block 515 on the lower surface of the adjusting plate 513, so that the connecting block 515 can drive the clamping plate 516 below to open and close synchronously, realizing the clamping and releasing of the sleeper body 1. After the fixed constraints between the sleeper body 1 to be replaced and the rail 2 are removed, the equipment removes the ballast below the sleeper body 1 to create space for extraction. At this time, motor 2 517 is started, and the two clamping plates 516 on both sides are moved towards each other through the bidirectional screw 512 to firmly clamp the sleeper body 1, preventing slippage, displacement or structural damage during extraction. After clamping, motor 1 505 is started, and the control screw 506 drives the movable plate 508, clamping box 510 and clamped sleeper body 1 to move slowly laterally, smoothly extracting the sleeper body 1 from the rail. This automates the extraction of the sleeper body 1, replacing the traditional manual prying method. It not only significantly reduces labor intensity and improves extraction efficiency, but also reduces disturbance to the surrounding ballast bed through symmetrical clamping and smooth translation control. At the same time, it avoids secondary damage to the sleeper body 1 due to uneven force, ensuring the safety and standardization of the sleeper replacement operation.
[0018] like Figure 1 As shown, the mobile vehicle body 3 includes a mobile base plate 301, a rotating platform 302 is provided on the upper surface of the mobile base plate 301, a control box 303 is fixedly connected to the upper surface of the rotating platform 302, and the right side of the hydraulic robotic arm 4 is fixedly connected to the left side of the rotating platform 302. The mobile base plate 301 of the mobile vehicle body 3 provides a stable foundation and mobile support for the entire vehicle body and its supporting components. The rotating platform 302 on top of it can achieve multi-angle rotation adjustment. The control box 303 on the upper surface of the rotating platform 302 can coordinate and control the linkage operation of various motors and hydraulic components of the device. The structural design of the hydraulic robotic arm 4 being fixedly connected to the left side of the rotating platform 302 allows the rotating platform 302 to synchronously drive the hydraulic robotic arm 4 and the sleeper replacement mechanism 5 at the bottom to rotate as a whole, flexibly adapting to the spatial posture requirements of the new sleeper body 1 for clamping and moving. After the old sleeper body 1 is successfully pulled out, the rotation adjustment of the rotating platform 302, combined with the fine adjustment of the position of the hydraulic robotic arm 4, allows the two clamping plates 516 of the sleeper replacement mechanism 5 to accurately clamp the new sleeper body 1 and smoothly move it to the outside of the old sleeper removal space for temporary positioning. Then, through the precise drive of the corresponding motor, the clamping box 510 controls the clamped new sleeper body 1 to slowly move laterally, thus moving the new sleeper body... The new sleeper body 1 is precisely placed in the designated installation position under the rail 2. After it is in place, multiple torque mechanisms 502 on the sleeper replacement mechanism 5 can automatically complete the standardized locking operation of multiple spiral rail spikes 104, realizing the reliable fixation of the new sleeper body 1 to the rail 2. After the sleeper is installed and fixed, ballast backfilling is carried out on the ballast bed under and around the new sleeper body 1, thus completing the automated replacement process of the entire sleeper. The rotation adjustment of the rotating platform 302 realizes the spatial flexibility of the sleeper replacement mechanism 5 in picking up and placing the new sleeper. With the automated operation of the motor and torque mechanism 502, the integrated mechanized operation of the new sleeper body 1 from clamping, positioning, installation to locking is realized, replacing the traditional manual handling, placement and locking of the sleeper. This greatly improves the accuracy and efficiency of the new sleeper installation, while ensuring the firmness of the connection between the new sleeper body 1 and the rail 2. The entire process of replacing the old sleeper and installing the new sleeper forms a closed loop of mechanized linkage, further reducing the labor intensity of on-site personnel.
[0019] like Figure 4 and Figure 5 As shown, anti-slip pads 518 are fixedly connected to the opposite sides of the two clamping plates 516. By directly attaching the anti-slip pad 518 to the side wall of the sleeper body 1, the contact friction between the clamping plate 516 and the sleeper body 1 can be effectively increased, preventing slippage and displacement during the old sleeper extraction and new sleeper clamping and transfer. This ensures that the sleeper body 1 maintains a stable posture during lateral movement and spatial transfer, preventing excessive disturbance to the surrounding ballast bed or collision with track components caused by sleeper swaying. Furthermore, its elastic properties can buffer the clamping pressure of the clamping plate 516 on the sleeper body 1, preventing structural damage such as concrete chipping and cracking caused by direct contact between the rigid clamping plate 516 and the sleeper body 1. This effectively protects the structural integrity of the sleeper body 1 and further enhances the stability of the clamping structure, making the automated operation of clamping, extraction, and transfer of the sleeper body 1 smoother and more reliable, ensuring the smooth progress of the entire sleeper replacement operation.
[0020] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.
Claims
1. A prefabricated sleeper for ballasted railway track and an automated sleeper changing device, comprising a sleeper body (1), characterized in that: The upper surface of the sleeper body (1) is symmetrically provided with rails (2), the upper surfaces of the two rails (2) are commonly provided with a moving vehicle body (3), the left side of the moving vehicle body (3) is provided with a hydraulic mechanical arm (4), and the bottom end of the hydraulic mechanical arm (4) is provided with a sleeper changing mechanism (5).
2. The prefabricated sleeper and automatic sleeper changing device for ballasted track of railway according to claim 1, characterized in that: The upper surface of the sleeper body (1) and below the two rails (2) are both provided with grooves (101), the lower surfaces of the two grooves (101) and on both sides of the two rails (2) are both embeddedly and fixedly connected with embedded bolts (102), the outer side walls of the plurality of embedded bolts (102) are all provided with fixing assemblies (103), and the outer side walls of the plurality of embedded bolts (102) and above the plurality of fixing assemblies (103) are all threadedly connected with spiral spikes (104).
3. The prefabricated sleeper and automatic sleeper changing device for ballasted track of railway according to claim 1, characterized in that: The sleeper changing mechanism (5) comprises an operation plate (501), the lower surface of the operation plate (501) and above the plurality of embedded bolts (102) is provided with a torsion mechanism (502), and the front surface and the rear surface of the operation plate (501) are both embeddedly installed with laser ranging radars (503).
4. The precast sleeper and automated sleeper changing device for ballasted track of railway according to claim 1, characterized in that: The moving vehicle body (3) comprises a moving bottom plate (301), the upper surface of the moving bottom plate (301) is provided with a rotating platform (302), the upper surface of the rotating platform (302) is fixedly connected with a control box (303), and the right side of the hydraulic mechanical arm (4) is fixedly connected with the left side of the rotating platform (302).
5. The prefabricated sleeper and automatic sleeper changing device for ballasted track of railway according to claim 3, characterized in that: The inside of the operation plate (501) is provided with a shifting cavity (504), the inside front surface of the shifting cavity (504) is fixedly connected with a motor one (505), the output shaft rear end of the motor one (505) is fixedly connected with a control screw rod (506), the inside lower surface of the shifting cavity (504) is provided with a penetrating horizontal groove one (507), the outer side wall of the control screw rod (506) is threadedly connected with a movable plate (508), the lower surface of the movable plate (508) is fixedly connected with a connecting block one (509), the lower surface of the connecting block one (509) penetrates through the horizontal groove one (507) and is fixedly connected with a clamping box (510).
6. A precast sleeper and automated sleeper changing device for ballasted railway tracks according to claim 5, characterized in that: The inside of the clamping box (510) is provided with a clamping cavity (511), the inside left side and the inside right side of the clamping cavity (511) are both rotatably connected with a bidirectional screw rod (512) through a rotating shaft, the outer side walls of the bidirectional screw rod (512) are symmetrically threadedly connected with adjusting plates (513), the inside lower surface of the clamping cavity (511) is provided with a penetrating horizontal groove two (514), the lower surfaces of the two adjusting plates (513) are both fixedly connected with connecting blocks two (515), the lower surfaces of the two connecting blocks two (515) both penetrate through the horizontal groove two (514) and are both fixedly connected with clamping plates (516), and the left side of the clamping box (510) is fixedly connected with a motor two (517). The output shaft right end of the motor two (517) is fixedly connected with the left end of the bidirectional screw rod (512).
7. A precast sleeper and automated sleeper changing device for ballasted railway tracks according to claim 6, characterized in that: Opposite sides of the two clamping plates (516) are fixedly connected with non-slip mats (518).