High-speed polishing trolley and traction method

Abstract

The application discloses a high-speed polishing trolley and a traction method, and relates to the technical field of rail polishing. The high-speed polishing trolley comprises a trolley frame, a traction rod which is arranged at one end of the top of the trolley frame and connected with the top ball hinge of the trolley frame, and is connected with the top connecting frame at the other end, a balance rod which is connected with the trolley frame at one end and connected with the top connecting frame at the other end, a polishing assembly which is arranged on the trolley frame and used for polishing a track, a pose detection device which is arranged on the trolley frame and used for detecting the pose of the trolley frame, and a control system which is electrically connected with the balance rod and the pose detection device. The balance rod can be stretched and contracted, and the trolley frame of the polishing trolley is constructed into a dynamic stable high-precision operation platform, so that the consistency of polishing quality, the upper limit of operation speed, the adaptability to complex working conditions and the operation safety are remarkably improved, and the polishing efficiency of the track is improved.

Description

Technical Field

[0001] This invention relates to the field of rail grinding technology, specifically to a high-speed grinding trolley and its traction method. Background Technology

[0002] With the rapid development of railways, my country has become a veritable railway superpower. Train weight and traffic density are constantly increasing, leading to a corresponding increase in the working time and frequency of railway tracks. Due to factors such as the dynamic forces of trains, the natural environment, and the quality of the rails themselves, rails frequently suffer damage, resulting in surface defects such as corrugation, fish-scale patterns, spalling, edge thickening, and abrasions. This shortens rail lifespan, increases maintenance workload and costs, and can even seriously affect traffic safety. To improve rail lifespan and safety performance, grinding technology is used to eliminate surface defects, improve track quality, and ensure safe train operation.

[0003] Currently, rail grinding is mainly carried out using grinding wheels and milling cutters. However, due to limitations in the performance of the grinding tools and the grinding method, the grinding process is characterized by low efficiency and high cost. Belt grinding, on the other hand, has the advantages of high material removal rate, high grinding quality, and low temperature. However, compared to traditional grinding wheel grinding, belt grinding vehicles have a smaller body mass, which can lead to instability and poor grinding results during rapid operation. Furthermore, the "maintenance window" is short and precious; failure to grind within a short time will inevitably affect train operation.

[0004] Therefore, it is necessary to develop and design a high-speed grinding carriage and traction method to ensure the stability of the grinding carriage and thus improve grinding efficiency. This is a technical problem that needs to be solved by those skilled in the art. Summary of the Invention

[0005] To address the aforementioned problems, this invention provides a high-speed grinding carriage and its traction method, ensuring the stability of the grinding carriage and thereby improving grinding efficiency.

[0006] To achieve the above objectives, the present invention provides the following solution: A high-speed grinding carriage includes a frame, a traction rod with one end connected to the top of the frame via a ball joint and the other end connected to a roof connecting frame, a balance bar with one end connected to the frame and the other end connected to the roof connecting frame, a grinding assembly mounted on the frame for grinding tracks, a posture detection device mounted on the frame for posture detection of the frame, and a control system electrically connected to the balance bar and the posture detection device, wherein the balance bar is telescopic.

[0007] Preferably, the frame is a rectangular structure, and there are four stabilizer bars, which are respectively located at the four corners of the frame.

[0008] Preferably, the stabilizer bar is a hydraulic cylinder, one end of which is connected to the roof connecting frame, and the other end of which is hinged to the vehicle frame.

[0009] Preferably, the tow bar is an electric cylinder, one end of which is connected to the vehicle frame via a ball joint, and the other end of which is hinged to the roof connecting frame.

[0010] Preferably, at least two traction rods are provided.

[0011] Preferably, the tow bar is provided in three parts and arranged in a triangle on the top of the vehicle frame.

[0012] Preferably, the pose detection device is a tilt sensor.

[0013] Preferably, the bottom of the vehicle frame is provided with running wheels that cooperate with the track.

[0014] Preferably, the grinding assembly includes a grinding motor mounted on the vehicle frame, a grinding head connected to the output end of the grinding motor, and a pressing cylinder with one end connected to the grinding motor and the other end connected to the vehicle frame.

[0015] This invention also discloses a traction method, which utilizes the high-speed grinding carriage described above, and mainly includes the following steps: The grinding carriage is towed by a tow bar; The control system generates control commands based on the vehicle frame pose information detected in real time by the pose detection device. The control command drives the balance bar to extend and retract, adjusting the overall posture and balance of the grinding trolley.

[0016] The present invention achieves the following technical effects compared to the prior art: Through the synergistic innovation of "spherical joint traction rod" and "active balance rod", the inherent contradiction between traction force transmission and attitude stability in high-speed grinding operations is systematically solved. The spherical joint passively adapts to track undulations and relative motion, avoiding rigid interference, while the balance rod based on posture detection closed-loop control can actively and in real time counteract the tendency of the vehicle body to tilt and roll over caused by traction torque and external disturbances. The combination of the two builds the grinding trolley into a dynamically stable high-precision working platform, thereby significantly improving the consistency of grinding quality, the upper limit of working speed, the adaptability to complex working conditions and operational safety, and improving the grinding efficiency of the track. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Appendix Figure 1 This is a schematic diagram of the main view structure of the high-speed grinding carriage disclosed in this invention; Appendix Figure 2 This is a side view structural schematic diagram of the high-speed grinding carriage disclosed in this invention; Appendix Figure 3 This is a schematic diagram of the overall structure of the high-speed grinding carriage disclosed in this invention; The components include: 1. stabilizer bar; 2. frame; 3. tow bar; 4. running wheels; and 5. hydraulic cylinder. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] The purpose of this invention is to provide a high-speed grinding carriage and a traction method to ensure the stability of the grinding carriage and thus improve grinding efficiency.

[0021] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] refer to Figures 1-3 The high-speed grinding trolley disclosed in this embodiment of the invention includes at least a frame 2. A traction rod 3 is provided on the top of the frame 2. One end of the traction rod 3 is connected to the top of the frame 2 through a ball joint, and the other end of the traction rod 3 is connected to the roof connecting frame. The roof connecting frame is provided on the body for towing the grinding trolley. A balance bar 1 is provided in the circumferential direction of the frame 2. The balance bar 1 is telescopic. One end of the balance bar 1 is connected to the frame 2, and the other end of the balance bar 1 is connected to the roof connecting frame. A grinding component for grinding the track and a posture detection device for detecting the posture of the frame 2 are provided on the frame 2. The posture detection device and the balance bar 1 are both electrically connected to the control system. In this embodiment, a balance bar 1 is installed between the frame 2 and the roof connecting frame, and the traction rod 3 is connected to the top ball joint of the frame 2. Based on the running speed of the grinding trolley and the track conditions, the control system controls the balance bar 1 to output thrust in real time, applying downward pressure to the grinding trolley. This increases the normal pressure between the grinding trolley and the track, improving the adhesion between the grinding trolley and the track, effectively suppressing unstable phenomena such as body bouncing and tilting caused by track irregularities during high-speed operation, and providing a stable operating benchmark for the belt sanding unit. However, the traction rod 3 transmits traction force and... During the process of applying downward pressure with the balance bar 1, an additional torque will be generated because the point of application of the force is not collinear with the center of gravity of the grinding carriage. This will cause the grinding carriage to tend to flip around the center of gravity. When the posture detection device detects that the frame 2 is flipping due to the imbalance of torque, the control system immediately controls the balance bar 1 to extend or retract. By applying a lateral or longitudinal reverse support force, the additional torque generated by the traction bar 3 is offset, ensuring that the sanding belt and the track tread always maintain a stable contact pressure and fit, and avoiding quality problems such as uneven grinding amount and surface scratches caused by the shaking of the carriage. In other words, the inherent contradiction between traction force transmission and attitude stability in high-speed grinding operations is systematically solved by the balance bar 1. The balance bar 1 passively or actively adapts to track undulations and relative motion, and in real time counteracts the tendency of the car body to tilt and roll over caused by traction torque and external disturbances, avoiding rigid interference. The frame 2 of the grinding trolley is constructed into a dynamically stable high-precision working platform, thereby significantly improving the consistency of grinding quality, the upper limit of working speed, the adaptability to complex working conditions and operational safety, and improving the grinding efficiency of the track.

[0023] refer to Figures 1-2 In one embodiment, the frame 2 is a rectangular structure with four balance bars 1, which are respectively located at the four corners of the frame 2. By differentially extending and retracting the balance bars 1 on the left and right sides of the frame 2 (e.g., the two bars on the left extend and the two bars on the right shorten), a pure roll correction torque can be generated to quickly correct the left and right tilt of the frame 2. By differentially extending and retracting the balance bars 1 at the front and rear ends of the frame 2 (e.g., the two bars at the front extend and the two bars at the rear shorten), a pure pitch correction torque can be generated to prevent the frame 2 from nodding or tilting. By synchronously extending and retracting the four balance bars 1, the frame 2 can be raised or lowered as a whole to compensate for vertical unevenness of the track or to actively adjust the grinding pressure reference. By differentially extending and retracting the balance bars 1 on the diagonals (e.g., the left front and right rear bars extend and the right front and left rear bars shorten), a torque can be generated to correct the torsion of the frame 2 in the horizontal plane. The most effective correction strategy can be combined for any instability mode of the frame 2.

[0024] refer to Figures 1-2In one embodiment, the stabilizer bar 1 is a hydraulic cylinder. One end of the hydraulic cylinder is connected to the roof connecting frame, and the other end is hinged to the frame 2. When the frame 2 is about to tilt violently during high-speed cornering or when it encounters track impact, the hydraulic system can instantly provide high-pressure oil to the hydraulic cylinder, driving the piston rod to extend or retract rapidly, generating an instantaneous force of several tons or even tens of tons, thereby firmly holding or pulling the frame 2. The hydraulic cylinder itself is a linear actuator. If both ends are rigidly connected, huge bending stress will be generated on the cylinder body, which is very easy to damage. Hinged to the frame 2 (ball joint or cross joint), the hydraulic cylinder is allowed to swing freely with the relative movement of the frame 2 and the roof connecting frame during operation, bearing only axial tensile and compressive forces, protecting the cylinder body, piston rod and seals, and greatly improving reliability and lifespan. The frame 2 and the roof connecting frame will undergo slight elastic deformation under load. The hinged connection can adapt to these deformations and avoid jamming or additional stress caused by structural interference.

[0025] refer to Figures 1-2 In one implementation, the traction rod 3 is an electric cylinder. One end of the electric cylinder is connected to the frame 2 by a ball joint, and the other end of the electric cylinder is connected to the roof connecting frame by a hinge. The control system can use the traction force as an active control variable. When the uneven track causes the frame 2 to bounce back and forth (nodding vibration), the electric cylinder can output a reverse force instantly, just like an active suspension, to actively absorb vibration energy and achieve smoothness far exceeding that of a passive structure. By adjusting the output force and the point of application of the electric cylinder (in conjunction with the torque transmission of the ball joint), a torque to correct the front and rear tilt of the frame 2 can be directly generated. In conjunction with the four corner balance bars 1, it can achieve precise stability of the pitch attitude.

[0026] refer to Figures 1-2 As an implementation method, at least two traction rods 3 are set, and the traction force is changed from a single point concentrated application to a two-point or multi-point distributed application. The force transmission path is better, which can reduce the local stress concentration of the frame 2 structure, make the force more uniform, and extend the service life of the frame 2.

[0027] refer to Figure 1 As a preferred approach, three tow bars 3 are arranged in a triangle on the top of the frame 2. The triangular layout can eliminate the possibility of the frame 2 twisting (yaw) relative to the connecting frame in the horizontal plane. The traction force or impact force in any direction can be decomposed and transmitted through the three vertices of the triangle in the most direct and uniform way, which greatly optimizes the stress state of the top of the frame 2 and avoids stress concentration.

[0028] It should be noted that when two or three traction rods 3 are set, the traction rods 3 can also be arranged in parallel to ensure uniform force distribution.

[0029] refer to Figures 1-2As a preferred approach, the pose detection device is a tilt sensor. The tilt sensor provides the most direct target variable, making the controller design (such as PID control) intuitive and efficient, and enabling the rapid establishment of a stable closed loop with angle as the target.

[0030] refer to Figures 1-2 As one implementation method, the bottom of the frame 2 is equipped with running wheels 4 that cooperate with the track. Under the action of traction, the running wheels 4 roll on the track to achieve efficient and low-resistance movement.

[0031] refer to Figures 1-2 As one implementation method, the grinding assembly includes a grinding motor mounted on the frame 2. The output end of the grinding motor is connected to a grinding head. A pressing cylinder 5 is mounted on the end of the grinding motor away from the grinding head. The end of the pressing cylinder 5 away from the grinding motor is connected to the frame 2. Before grinding, the control system commands the pressing cylinder 5 to extend, driving the grinding motor to move downward until the grinding head contacts the rail and reaches the preset pressure. During the movement of the grinding trolley, there are longitudinal and vertical smoothness errors in the rail. When there is a local bulge in the rail, the pressing cylinder 5 is passively retracted to buffer. When there is a local depression in the rail, the cylinder actively extends to maintain the pressure, ensuring the continuous stability of the grinding pressure. After grinding is completed or in case of an emergency, the pressing cylinder 5 can quickly retract, completely lifting the grinding head off the rail and switching to the transportation or avoidance state.

[0032] It should be noted that the outer periphery of the pressing cylinder 5 is equipped with a bellows cover to prevent dust and metal shavings from entering the pressing cylinder 5.

[0033] This invention also discloses a traction method, which uses the high-speed grinding carriage described above, and mainly includes the following steps: The pose detection device installed on the frame 2 acquires the pose information of the frame 2 in real time. The pose information includes at least the roll angle and pitch angle of the frame 2. The control system receives and processes the pose information, compares it with the preset stable pose setting value, and calculates the pose deviation of the frame 2; based on the pose deviation, it generates control commands for the stabilizer bar 1 to adjust the attitude of the frame 2. According to the control command of the stabilizer bar 1, one or more stabilizer bars 1 set in the circumferential direction of the frame 2 are driven to perform corresponding telescopic movements. The active force generated by the stabilizer bar 1 dynamically counteracts the disturbance torque that causes the frame 2 to lose its posture, thereby adjusting and maintaining the overall posture balance of the grinding trolley in real time. While maintaining dynamic posture balance on the frame 2, the grinding components installed on the frame 2 are controlled to perform grinding operations on the track.

[0034] It should be noted that, for those skilled in the art, it is obvious that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A high-speed grinding carriage, characterized in that, The system includes a frame (2), a traction rod (3) with one end connected to the top of the frame (2) by a ball joint and the other end connected to the roof connecting frame, a balance bar (1) with one end connected to the frame (2) and the other end connected to the roof connecting frame, a grinding assembly on the frame (2) for grinding the track, a posture detection device on the frame (2) for posture detection, and a control system electrically connected to the balance bar (1) and the posture detection device. The balance bar (1) is telescopic.

2. The high-speed grinding carriage according to claim 1, characterized in that, The frame (2) is a rectangular structure, and there are four balance bars (1), which are respectively located at the four corners of the frame (2).

3. The high-speed grinding carriage according to claim 2, characterized in that, The balance bar (1) is a hydraulic cylinder. One end of the hydraulic cylinder is connected to the roof connecting frame, and the other end of the hydraulic cylinder is hinged to the vehicle frame (2).

4. The high-speed grinding carriage according to claim 1, characterized in that, The traction rod (3) is an electric cylinder. One end of the electric cylinder is ball-jointed to the frame (2), and the other end of the electric cylinder is hinged to the roof connecting frame.

5. The high-speed grinding carriage according to claim 4, characterized in that, The traction rod (3) is configured to be at least two.

6. The high-speed grinding carriage according to claim 4, characterized in that, The tow bar (3) is set in three parts and arranged in a triangle on the top of the frame (2).

7. The high-speed grinding carriage according to claim 1, characterized in that, The pose detection device is a tilt sensor.

8. The high-speed grinding carriage according to claim 1, characterized in that, The bottom of the frame (2) is provided with running wheels (4) that cooperate with the track.

9. The high-speed grinding carriage according to claim 1, characterized in that, The grinding assembly includes a grinding motor mounted on the frame (2), a grinding head connected to the output end of the grinding motor, and a pressing cylinder (5) with one end connected to the grinding motor and the other end connected to the frame (2).

10. A traction method, using a high-speed grinding carriage as described in any one of claims 1-9, characterized in that, The main steps include: The grinding trolley is pulled by the traction rod (3); The control system generates control commands based on the vehicle frame (2) position information detected in real time by the position detection device. The control command drives the balance bar (1) to extend and retract, thereby adjusting the overall posture balance of the grinding trolley.

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