Overhead crane cart operation deviation rectifying system and method

Abstract

The invention belongs to the technical field of cranes, and particularly relates to a crane cart operation deviation rectifying system and method. The system comprises a first contact switch, a second contact switch, a third contact switch, a fourth contact switch, a first motor, a second motor, a third motor, a fourth motor, a first wheel, a second wheel, a third wheel, a fourth wheel and a speed reducer. A plurality of contact switches are directly linked with the motor, so that grouping of cart motors or configuration of special frequency converters and encoders is not needed, the number and types of electrical elements are greatly reduced, and the limitation on the types of the motors is reduced; the deviation of the crane body can be detected in real time, power difference deviation correction can be achieved immediately by starting and stopping corresponding motors, the response speed is high, the deviation correction process is automatic and continuous, and it is effectively guaranteed that the crane runs linearly along a track.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of cranes, in particular to a trolley cart running deviation correction system and method. BACKGROUND

[0002] When the trolley cart is running, the cart will be inclined to a certain direction in the running direction during long-term use, which will cause different degrees of rail biting. Rail biting refers to a serious friction phenomenon between the cart and the track. Rail biting will damage the track and also cause considerable damage to the cart wheels, which seriously affects the service life of the cart wheels and the track. Therefore, it is necessary to use a deviation correction system to correct the running direction of the long-term running cart, so that the running direction is normal and does not deviate from the track, thereby avoiding the phenomenon of rail biting.

[0003] The current traditional deviation correction system needs to divide the motor of the cart into two groups, one group on each end beam side. Two groups of motors are controlled by one frequency converter respectively. The motor needs to be a variable frequency motor. An encoder is added at each of the two groups of cart wheels to correct the running direction of the cart wheels by measuring the linear speed of the two sides of the cart wheels. This system requires high requirements for the electric control system and the motor, and needs to be equipped with multiple sensors, which has high cost. At the same time, due to the high accuracy requirement of the system, many parameters need to be adjusted during the transformation. After replacing the wheels each time, multiple debugging needs to be performed again, which has high transformation cost and long time, has limitations, and affects production efficiency. SUMMARY

[0004] The present application aims to overcome the shortcomings of the prior art and provide a trolley cart running deviation correction system and method.

[0005] The technical solution adopted by the present application to solve its technical problems is: A trolley cart running deviation correction system, which is connected to the bottom of the trolley cart. The bottom of the trolley cart includes two or more wheel groups. Each wheel group is symmetrically provided with two wheels in the horizontal direction. The wheels are slidingly arranged on guide rails. The guide rails are arranged in the longitudinal direction and are parallel and spaced apart in the horizontal direction. A plurality of wheel groups are uniformly and spaced apart in the longitudinal direction on the guide rails. The system includes a first contact switch, a second contact switch, a third contact switch, a fourth contact switch, a first motor, a second motor, a third motor, a fourth motor, a first wheel, a second wheel, a third wheel, a fourth wheel, and a reducer. The wheel on the horizontal side of the outermost wheel group in the longitudinal direction is designated as the first wheel, and the wheel on the horizontal side of the same wheel group is designated as the second wheel. The wheel on the horizontal side of the outermost wheel group in the other longitudinal direction is designated as the third wheel, and the wheel on the horizontal side of the same wheel group is designated as the fourth wheel. The first wheel and the third wheel are arranged along the same guide rail, and the second wheel and the fourth wheel are arranged along the same guide rail. The first wheel is connected to the first motor, the second wheel is connected to the second motor, the third wheel is connected to the third motor, and the fourth wheel is connected to the fourth motor. The motor can provide power to the wheel, and a reducer is provided between the wheel and the motor. The first, second, third, and fourth contact switches are all arranged longitudinally. The first and second contact switches are both located on the longitudinal outer sides of the first wheel and on the horizontal sides of the guide rail. The third and fourth contact switches are both located on the longitudinal outer sides of the third wheel and on the horizontal sides of the guide rail. The first contact switch is connected to the third motor via an electrical signal, the second contact switch is connected to the fourth motor via an electrical signal, the third contact switch is connected to the first motor via an electrical signal, and the fourth contact switch is connected to the second motor via an electrical signal. Each contact switch can control the start and stop of the motor connected to it. The first contact switch, the second contact switch, the third contact switch, and the fourth contact switch are all capable of contacting the guide rail and emitting electrical signals, and all of them are normally open contact switches.

[0006] Furthermore, the control method for the overhead crane trolley operation correction system described above is characterized by including the following steps: (1) When the overhead crane is running longitudinally towards the first and second wheels, the first and second contact switches are activated. If the overhead crane does not deviate in its running direction, all motors will run normally, driving the crane to move. If the overhead crane deviates in its running direction towards the first wheel, the second contact switch will disconnect after contacting the guide rail. The second contact switch will shut down the fourth motor through an electrical signal, making the power on the first wheel greater than that on the second wheel, causing the overhead crane to actively deviate towards the second wheel due to the power difference. As it continues to deviate towards the second wheel, when the second contact switch no longer contacts the guide rail, the fourth motor will start running, and the offset correction of the overhead crane will be completed. If the overhead crane deviates in its running direction towards the second wheel, the first contact switch will disconnect after contacting the guide rail. The first contact switch will shut down the third motor through an electrical signal, making the power on the second wheel greater than that on the first wheel, causing the overhead crane to actively deviate towards the first wheel due to the power difference. As it continues to deviate towards the first wheel, when the first contact switch no longer contacts the guide rail, the third motor will start running, and the offset correction of the overhead crane will be completed. (2) When the overhead crane is running longitudinally towards the third and fourth wheels, the third and fourth contact switches are activated. If the overhead crane's running direction does not deviate, all motors operate normally, driving the crane to move. If the overhead crane's running direction deviates towards the third wheel, the fourth contact switch contacts the guide rail and then disconnects. The fourth contact switch shuts off the second motor via an electrical signal, making the power on the third wheel side greater than that on the fourth wheel side. This causes the overhead crane to actively deviate towards the fourth wheel side due to the power difference. As it continues to deviate towards the fourth wheel side... When the fourth contact switch is no longer in contact with the guide rail, the second motor starts running, and the offset correction of the overhead crane is completed. If the overhead crane deviates in the direction of travel towards the fourth wheel, the third contact switch contacts the guide rail and then disconnects. The third contact switch shuts off the first motor through an electrical signal, making the power on the fourth wheel greater than that on the third wheel. This causes the overhead crane to actively deviate towards the third wheel due to the power difference. As it continues to deviate towards the third wheel, when the third contact switch is no longer in contact with the guide rail, the first motor starts running, and the offset correction of the overhead crane is completed. All of the above motors are set to the on state by default.

[0007] Furthermore, the device also includes an external control system, and all the contact switches are connected to the corresponding motors through the external control system.

[0008] Furthermore, the control method of the overhead crane operation correction system described above is characterized by the following steps: (1) The external control system scans the energization status of all contact switches every four seconds, and avoids making incorrect judgments due to the cumulative status of the previous round of crane operation by delaying the execution. When the overhead crane runs longitudinally towards the first wheel and the second wheel, the first contact switch and the second contact switch are connected to the third motor and the fourth motor. When the overhead crane runs along the longitudinal direction of the third wheel and the fourth wheel, the third contact switch and the fourth contact switch are connected to the first motor and the second motor.

[0009] (2) When the trolley is running longitudinally toward the first wheel and the second wheel, if the first proximity switch is disconnected and the disconnection time exceeds 10 seconds, it is determined that the trolley's running trend is that the trolley body is leaning toward the second wheel when running longitudinally toward the first wheel and the second wheel. The third motor of the trolley needs to be disconnected for adjustment. When the trolley is running longitudinally along the side of the first and second wheels, if the second proximity switch is turned off and remains off for more than 10 seconds, it is determined that the trolley is moving longitudinally along the side of the first and second wheels and the trolley body is leaning towards the first wheel. The fourth motor of the trolley needs to be disconnected for adjustment. When the trolley is running longitudinally toward the third and fourth wheels, if the third proximity switch is disconnected and remains off for more than 10 seconds, it is determined that the trolley's running trend is that the trolley body is leaning toward the fourth wheel side when running longitudinally toward the third and fourth wheels, and the trolley's first motor needs to be disconnected for adjustment. When the trolley is running longitudinally toward the third and fourth wheels, if the fourth proximity switch is disconnected and remains off for more than 10 seconds, it is determined that the trolley is moving longitudinally toward the third and fourth wheels and the trolley body is leaning toward the third wheel. The second motor of the trolley needs to be disconnected for adjustment. (3) When the trolley is running longitudinally towards the first and second wheels, if the first contact switch and the fourth contact switch are simultaneously turned off for more than 8 seconds, it is determined that the trolley body is seriously tilted towards the second wheel. After 8 seconds, the third motor of the trolley is disconnected, and the first motor of the trolley is disconnected at the same time. If the second contact switch and the third contact switch are simultaneously turned off for more than 8 seconds, it is determined that the trolley body is seriously tilted towards the first wheel. After 8 seconds, the fourth motor of the trolley is disconnected, and the second motor of the trolley is disconnected at the same time. When the trolley is running longitudinally towards the third and fourth wheels, if the first and fourth contact switches are simultaneously closed for more than 8 seconds, it is determined that the trolley body is severely tilted towards the fourth wheel side. After 8 seconds, the first motor of the trolley is disconnected, and the third motor of the trolley is also disconnected at the same time. If the second and third contact switches are simultaneously closed for more than 8 seconds, it is determined that the trolley body is severely tilted towards the third wheel side. After 8 seconds, the second motor of the trolley is disconnected, and the fourth motor of the trolley is also disconnected at the same time. The intermittent disconnection sequence of the trolley motor is as follows: disconnect for 5 seconds, then connect for 5 seconds, then disconnect for 5 seconds, then connect for 5 seconds, until the trolley stops or at least one contact switch resumes conduction.

[0010] The advantages and positive effects of this invention are as follows: 1. This invention sets up multiple contact switches that are directly linked to the motor, eliminating the need to group the trolley motors or configure dedicated frequency converters and encoders, which greatly reduces the number and types of electrical components, lowers the restrictions on motor types, and reduces the overall cost of the system.

[0011] 2. This invention uses a contact switch directly placed near the wheel and rail to detect the vehicle body deviation in real time and immediately correct the deviation by starting and stopping the corresponding motor. The response speed is fast, and the correction process is automatic and continuous, effectively ensuring that the overhead crane runs in a straight line along the track.

[0012] 3. The system of this invention has few parameters, clear logic, and short modification and debugging cycle; no complex readjustment is required after wheel replacement, which significantly reduces downtime and improves equipment utilization and production efficiency.

[0013] 4. The system of this invention does not rely on high-precision sensors or complex control algorithms, adapts to various working conditions in industrial sites, has strong anti-interference capabilities, stable operation, and long service life, and is suitable for production use in small and medium-sized enterprises. Attached Figure Description

[0014] Fig. 1 This is a top view schematic diagram of a structural connection according to the present invention; Fig. 2 This is a photographic illustration of a physical object of the present invention; Fig. 3 This is a schematic diagram of an electrical control cabinet connection according to the present invention. Detailed Implementation

[0015] The present invention will be further described below with reference to the embodiments. The following embodiments are descriptive and not limiting, and should not be used to limit the scope of protection of the present invention.

[0016] The various experimental operations involved in the specific embodiments are all conventional techniques in the field. For parts not specifically annotated in this document, those skilled in the art can refer to various commonly used reference books, scientific and technological documents or related instructions and manuals prior to the filing date of this invention to carry out the operations.

[0017] A crane trolley operation correction system, such as Figs. 1 to 3 As shown, the system is connected to the bottom of the overhead crane (not shown in the figure). The bottom of the overhead crane includes two or more wheel sets 13. Each wheel set has two wheels symmetrically arranged in the horizontal direction. The wheels are slidably arranged on the guide rail 15. The guide rail is arranged in the longitudinal direction and has two wheels spaced parallel to each other in the horizontal direction. Multiple wheel sets are evenly distributed and spaced on the guide rail in the longitudinal direction. The system includes a first contact switch 1, a second contact switch 2, a third contact switch 3, a fourth contact switch 4, a first motor 5, a second motor 6, a third motor 7, a fourth motor 8, a first wheel 9, a second wheel 10, a third wheel 11, a fourth wheel 12, and a reducer 14. The wheel on the horizontal side of the outermost wheel group in the longitudinal direction is designated as the first wheel, and the wheel on the other horizontal side of the same wheel group is designated as the second wheel. The wheel on the horizontal side of the outermost wheel group in the other longitudinal direction is designated as the third wheel, and the wheel on the other horizontal side of the same wheel group is designated as the fourth wheel. The first wheel and the third wheel are arranged along the same guide rail, and the second wheel and the fourth wheel are arranged along the same guide rail. The first wheel is connected to the first motor, the second wheel is connected to the second motor, the third wheel is connected to the third motor, and the fourth wheel is connected to the fourth motor. The motor can provide power to the wheel, and a reducer is provided between the wheel and the motor to facilitate power transmission between the motor and the wheel. The first, second, third, and fourth contact switches are all arranged longitudinally. The first and second contact switches are both located on the longitudinal outer sides of the first wheel and on the horizontal sides of the guide rail. The third and fourth contact switches are both located on the longitudinal outer sides of the third wheel and on the horizontal sides of the guide rail. The first contact switch is connected to the third motor via an electrical signal, the second contact switch is connected to the fourth motor via an electrical signal, the third contact switch is connected to the first motor via an electrical signal, and the fourth contact switch is connected to the second motor via an electrical signal. Each contact switch can control the start and stop of the motor connected to it, facilitating motor start and stop control. The first contact switch, the second contact switch, the third contact switch, and the fourth contact switch are all capable of contacting the guide rail and emitting electrical signals, and all of them are normally open contact switches.

[0018] The control method for the overhead crane trolley operation correction system described above includes the following steps: (1) When the overhead crane is running longitudinally towards the first and second wheels, the first and second contact switches are activated. If the overhead crane does not deviate in its running direction, all motors will run normally, driving the crane to move. If the overhead crane deviates in its running direction towards the first wheel, the second contact switch will disconnect after contacting the guide rail. The second contact switch will shut down the fourth motor through an electrical signal, making the power on the first wheel greater than that on the second wheel, causing the overhead crane to actively deviate towards the second wheel due to the power difference. As it continues to deviate towards the second wheel, when the second contact switch no longer contacts the guide rail, the fourth motor will start running, and the offset correction of the overhead crane will be completed. If the overhead crane deviates in its running direction towards the second wheel, the first contact switch will disconnect after contacting the guide rail. The first contact switch will shut down the third motor through an electrical signal, making the power on the second wheel greater than that on the first wheel, causing the overhead crane to actively deviate towards the first wheel due to the power difference. As it continues to deviate towards the first wheel, when the first contact switch no longer contacts the guide rail, the third motor will start running, and the offset correction of the overhead crane will be completed. (2) When the overhead crane is running longitudinally towards the third and fourth wheels, the third and fourth contact switches are activated. If the overhead crane's running direction does not deviate, all motors operate normally, driving the crane to move. If the overhead crane's running direction deviates towards the third wheel, the fourth contact switch contacts the guide rail and then disconnects. The fourth contact switch shuts off the second motor via an electrical signal, making the power on the third wheel side greater than that on the fourth wheel side. This causes the overhead crane to actively deviate towards the fourth wheel side due to the power difference. As it continues to deviate towards the fourth wheel side... When the fourth contact switch is no longer in contact with the guide rail, the second motor starts running, and the offset correction of the overhead crane is completed. If the overhead crane deviates in the direction of travel towards the fourth wheel, the third contact switch contacts the guide rail and then disconnects. The third contact switch shuts off the first motor through an electrical signal, making the power on the fourth wheel greater than that on the third wheel. This causes the overhead crane to actively deviate towards the third wheel due to the power difference. As it continues to deviate towards the third wheel, when the third contact switch is no longer in contact with the guide rail, the first motor starts running, and the offset correction of the overhead crane is completed. All of the above motors are set to the on state by default.

[0019] This invention directly links multiple contact switches to the motors, eliminating the need to group the trolley motors or configure dedicated frequency converters and encoders. This significantly reduces the number and types of electrical components, lowers restrictions on motor types, and lowers the overall system cost. The contact switches are directly positioned near the wheels on the rail, enabling real-time detection of vehicle misalignment and immediate correction of the deviation by starting and stopping the corresponding motors. The response is fast, and the correction process is automatic and continuous, effectively ensuring the trolley runs straight along the track. The system has few parameters, clear logic, and a short modification and debugging cycle. No complex readjustment is required after wheel replacement, significantly reducing downtime and improving equipment utilization and production efficiency. This system does not rely on high-precision sensors or complex control algorithms, adapts to various industrial conditions, has strong anti-interference capabilities, stable operation, and a long service life.

[0020] In this embodiment, the device also includes an external control system (not shown in the figure). All the contact switches are connected to the corresponding motors through the external control system for unified operation.

[0021] In this embodiment, the method further includes the following steps: (1) The external control system scans the power-on status of all contact switches every four seconds. By delaying the execution, it avoids making incorrect judgments due to the cumulative status of the previous round of trolley operation. When the trolley is running longitudinally towards the first and second wheels, the first and second contact switches are connected to the third and fourth motors. When the trolley is running longitudinally along the third and fourth wheels, the third and fourth contact switches are connected to the first and second motors.

[0022] (2) When the trolley is running longitudinally toward the first wheel and the second wheel, if the first proximity switch is disconnected and the disconnection time exceeds 10 seconds, it is determined that the trolley's running trend is that the trolley body is leaning toward the second wheel when running longitudinally toward the first wheel and the second wheel. The third motor of the trolley needs to be disconnected for adjustment. When the trolley is running longitudinally along the side of the first and second wheels, if the second proximity switch is turned off and remains off for more than 10 seconds, it is determined that the trolley is moving longitudinally along the side of the first and second wheels and the trolley body is leaning towards the first wheel. The fourth motor of the trolley needs to be disconnected for adjustment. When the trolley is running longitudinally toward the third and fourth wheels, if the third proximity switch is disconnected and remains off for more than 10 seconds, it is determined that the trolley's running trend is that the trolley body is leaning toward the fourth wheel side when running longitudinally toward the third and fourth wheels, and the trolley's first motor needs to be disconnected for adjustment. When the trolley is running longitudinally toward the third and fourth wheels, if the fourth proximity switch is disconnected and remains off for more than 10 seconds, it is determined that the trolley is moving longitudinally toward the third and fourth wheels and the trolley body is leaning toward the third wheel. The second motor of the trolley needs to be disconnected for adjustment. (3) When the trolley is running longitudinally towards the first and second wheels, if the first contact switch and the fourth contact switch are simultaneously turned off for more than 8 seconds, it is determined that the trolley body is seriously tilted towards the second wheel. After 8 seconds, the third motor of the trolley is disconnected, and the first motor of the trolley is disconnected at the same time. If the second contact switch and the third contact switch are simultaneously turned off for more than 8 seconds, it is determined that the trolley body is seriously tilted towards the first wheel. After 8 seconds, the fourth motor of the trolley is disconnected, and the second motor of the trolley is disconnected at the same time. When the trolley is running longitudinally towards the third and fourth wheels, if the first and fourth contact switches are simultaneously closed for more than 8 seconds, it is determined that the trolley body is severely tilted towards the fourth wheel side. After 8 seconds, the first motor of the trolley is disconnected, and the third motor of the trolley is also disconnected at the same time. If the second and third contact switches are simultaneously closed for more than 8 seconds, it is determined that the trolley body is severely tilted towards the third wheel side. After 8 seconds, the second motor of the trolley is disconnected, and the fourth motor of the trolley is also disconnected at the same time. The intermittent disconnection sequence of the trolley motor is as follows: disconnect for 5 seconds, then connect for 5 seconds, then disconnect for 5 seconds, then connect for 5 seconds, until the trolley stops or at least one contact switch resumes conduction.

[0023] On the 45-ton overhead crane in Zone 1 of the Tianjin Steel Pipe Company's steelmaking plant, the problem of the crane's main trolley wearing off the rails has been greatly alleviated after the installation of the system. Compared to before the installation of the trolley alignment system, a total of 10 trolley wheels were consumed in 2024, averaging 1 to 2 wheels consumed per month. After the installation of the trolley alignment system in 2025, only one trolley wheel has been replaced in the past 10 months.

[0024] Although embodiments of the invention have been disclosed for illustrative purposes, those skilled in the art will understand that various substitutions, variations, and modifications are possible without departing from the spirit and scope of the invention and the appended claims. Therefore, the scope of the invention is not limited to the contents disclosed in the embodiments.

Claims

1. A crane trolley operation correction system, wherein the system is connected to the bottom of the crane trolley, the bottom of the crane trolley includes two or more wheel sets, each wheel set having two wheels symmetrically arranged in the horizontal direction, the wheels being slidably mounted on guide rails, the guide rails being longitudinally arranged and having two wheels spaced parallel to each other in the horizontal direction, and multiple wheel sets being evenly distributed and spaced along the longitudinal direction on the guide rails, characterized in that: The system includes a first contact switch, a second contact switch, a third contact switch, a fourth contact switch, a first motor, a second motor, a third motor, a fourth motor, a first wheel, a second wheel, a third wheel, a fourth wheel, and a reducer. The wheel on the horizontal side of the outermost wheel group in the longitudinal direction is designated as the first wheel, and the wheel on the horizontal side of the same wheel group is designated as the second wheel. The wheel on the horizontal side of the outermost wheel group in the other longitudinal direction is designated as the third wheel, and the wheel on the horizontal side of the same wheel group is designated as the fourth wheel. The first wheel and the third wheel are arranged along the same guide rail, and the second wheel and the fourth wheel are arranged along the same guide rail. The first wheel is connected to the first motor, the second wheel is connected to the second motor, the third wheel is connected to the third motor, and the fourth wheel is connected to the fourth motor. The motor can provide power to the wheel, and a reducer is provided between the wheel and the motor. The first, second, third, and fourth contact switches are all arranged longitudinally. The first and second contact switches are both located on the longitudinal outer sides of the first wheel and on the horizontal sides of the guide rail. The third and fourth contact switches are both located on the longitudinal outer sides of the third wheel and on the horizontal sides of the guide rail. The first contact switch is connected to the third motor via an electrical signal, the second contact switch is connected to the fourth motor via an electrical signal, the third contact switch is connected to the first motor via an electrical signal, and the fourth contact switch is connected to the second motor via an electrical signal. Each contact switch can control the start and stop of the motor connected to it. The first contact switch, the second contact switch, the third contact switch, and the fourth contact switch are all capable of contacting the guide rail and emitting electrical signals, and all of them are normally open contact switches.

2. The control method for the overhead crane trolley operation correction system as described in claim 1, characterized in that: Includes the following steps: (1) When the overhead crane is running longitudinally towards the first and second wheels, the first and second contact switches are activated. If the overhead crane does not deviate in its running direction, all motors will run normally, driving the crane to move. If the overhead crane deviates in its running direction towards the first wheel, the second contact switch will disconnect after contacting the guide rail. The second contact switch will shut down the fourth motor through an electrical signal, making the power on the first wheel greater than that on the second wheel, causing the overhead crane to actively deviate towards the second wheel due to the power difference. As it continues to deviate towards the second wheel, when the second contact switch no longer contacts the guide rail, the fourth motor will start running, and the offset correction of the overhead crane will be completed. If the overhead crane deviates in its running direction towards the second wheel, the first contact switch will disconnect after contacting the guide rail. The first contact switch will shut down the third motor through an electrical signal, making the power on the second wheel greater than that on the first wheel, causing the overhead crane to actively deviate towards the first wheel due to the power difference. As it continues to deviate towards the first wheel, when the first contact switch no longer contacts the guide rail, the third motor will start running, and the offset correction of the overhead crane will be completed. (2) When the overhead crane is running longitudinally towards the third and fourth wheels, the third and fourth contact switches are activated. If the overhead crane's running direction does not deviate, all motors operate normally, driving the crane to move. If the overhead crane's running direction deviates towards the third wheel, the fourth contact switch contacts the guide rail and then disconnects. The fourth contact switch shuts off the second motor via an electrical signal, making the power on the third wheel side greater than that on the fourth wheel side. This causes the overhead crane to actively deviate towards the fourth wheel side due to the power difference. As it continues to deviate towards the fourth wheel side... When the fourth contact switch is no longer in contact with the guide rail, the second motor starts running, and the offset correction of the overhead crane is completed. If the overhead crane deviates in the direction of travel towards the fourth wheel, the third contact switch contacts the guide rail and then disconnects. The third contact switch shuts off the first motor through an electrical signal, making the power on the fourth wheel greater than that on the third wheel. This causes the overhead crane to actively deviate towards the third wheel due to the power difference. As it continues to deviate towards the third wheel, when the third contact switch is no longer in contact with the guide rail, the first motor starts running, and the offset correction of the overhead crane is completed. All of the above motors are set to the on state by default.

3. The apparatus according to claim 1, characterized in that: The device also includes an external control system, and all the contact switches are connected to the corresponding motors through the external control system.

4. The control method for the overhead crane trolley operation correction system as described in claim 3, characterized in that: The following steps are included: (1) The external control system scans the power-on status of all contact switches every four seconds. By delaying the execution, it avoids making incorrect judgments due to the cumulative status of the previous round of trolley operation. When the trolley is running longitudinally towards the first and second wheels, the first and second contact switches are connected to the third and fourth motors. When the trolley is running along the longitudinal direction of the third and fourth wheels, the third and fourth contact switches are connected to the first and second motors. (2) When the trolley is running longitudinally toward the first wheel and the second wheel, if the first proximity switch is disconnected and the disconnection time exceeds 10 seconds, it is determined that the trolley's running trend is that the trolley body is leaning toward the second wheel when running longitudinally toward the first wheel and the second wheel. The third motor of the trolley needs to be disconnected for adjustment. When the trolley is running longitudinally along the side of the first and second wheels, if the second proximity switch is turned off and remains off for more than 10 seconds, it is determined that the trolley is moving longitudinally along the side of the first and second wheels and the trolley body is leaning towards the first wheel. The fourth motor of the trolley needs to be disconnected for adjustment. When the trolley is running longitudinally toward the third and fourth wheels, if the third proximity switch is disconnected and remains off for more than 10 seconds, it is determined that the trolley's running trend is that the trolley body is leaning toward the fourth wheel side when running longitudinally toward the third and fourth wheels, and the trolley's first motor needs to be disconnected for adjustment. When the trolley is running longitudinally toward the third and fourth wheels, if the fourth proximity switch is disconnected and remains off for more than 10 seconds, it is determined that the trolley is moving longitudinally toward the third and fourth wheels and the trolley body is leaning toward the third wheel. The second motor of the trolley needs to be disconnected for adjustment. (3) When the trolley is running longitudinally towards the first and second wheels, if the first contact switch and the fourth contact switch are simultaneously turned off for more than 8 seconds, it is determined that the trolley body is seriously tilted towards the second wheel. After 8 seconds, the third motor of the trolley is disconnected, and the first motor of the trolley is disconnected at the same time. If the second contact switch and the third contact switch are simultaneously turned off for more than 8 seconds, it is determined that the trolley body is seriously tilted towards the first wheel. After 8 seconds, the fourth motor of the trolley is disconnected, and the second motor of the trolley is disconnected at the same time. When the trolley is running longitudinally towards the third and fourth wheels, if the first and fourth contact switches are simultaneously closed for more than 8 seconds, it is determined that the trolley body is severely tilted towards the fourth wheel side. After 8 seconds, the first motor of the trolley is disconnected, and the third motor of the trolley is also disconnected at the same time. If the second and third contact switches are simultaneously closed for more than 8 seconds, it is determined that the trolley body is severely tilted towards the third wheel side. After 8 seconds, the second motor of the trolley is disconnected, and the fourth motor of the trolley is also disconnected at the same time. The intermittent disconnection sequence of the trolley motor is as follows: disconnect for 5 seconds, then connect for 5 seconds, then disconnect for 5 seconds, then connect for 5 seconds, until the trolley stops or at least one contact switch resumes conduction.

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