Sand suction bridge automatic deviation correction system and method

Abstract

The application discloses a kind of automatic deviation rectification system and method of sucking sand bridge, it is related to sucking sand bridge technical field.Longitudinal limiting module is used to execute closing action and send closing action signal when sucking sand bridge approaches the end of wheel track;Displacement deviation rectification module is used to adjust the displacement of the two sides of sucking sand bridge in the direction of wheel track, and respectively send the displacement L1 and L2 of the two sides of sucking sand bridge;Transverse limiting module is used to close limiting switch and send limiting signal when the displacement of the two sides of sucking sand bridge in the direction perpendicular to wheel track is greater than or equal to preset threshold;Controller is used to: according to closing action signal, control the running state of motor on the two sides of wheel;According to L1 and L2, adjust the running frequency of motor on the corresponding wheel;According to limiting signal, control the running state of motor on the two sides of wheel.The application improves the efficiency of sucking sand bridge to handle fault, reduces the derailment frequency of sucking sand bridge, and improves the running efficiency of sucking sand bridge.

Description

Technical Field

[0001] This invention relates to the field of sand suction bridge technology, and in particular to an automatic correction system and method for sand suction bridges. Background Technology

[0002] The water treatment industry has matured its processes. In various production stages, grit chambers or aerated grit chambers are widely using sand suction bridges to scrape and suck sludge (sand). Traditional sand suction bridges usually adopt a single-circuit dual-motor drive mode and are generally operated in a remote automatic control mode.

[0003] However, the problem of sand suction bridge derailment has occurred repeatedly in many water plants. The reasons include untimely handling of unilateral faults, easy derailment of the track, and untimely detection of problems in the early stage, which in turn leads to the expansion of faults and equipment losses. Summary of the Invention

[0004] The purpose of this invention is to provide an automatic correction system and method for sand suction bridges, which improves the efficiency of sand suction bridge fault handling, reduces the number of times sand suction bridges derail, and improves the operating efficiency of sand suction bridges.

[0005] To achieve the above objectives, embodiments of the present invention provide the following solutions:

[0006] An automatic correction system for a sand-absorbing bridge includes:

[0007] The longitudinal limiting module is installed at both ends of the sand suction bridge wheel rail. It is used to perform a closing action and send a closing action signal when the sand suction bridge approaches the end of the wheel rail. After the longitudinal limiting module closes, the sand suction bridge stops moving forward or reverses.

[0008] The displacement correction module is used to adjust the displacement of the wheels on both sides of the sand suction bridge in the wheel-rail direction, and outputs the displacements L1 and L2 of the wheels on both sides of the sand suction bridge respectively.

[0009] The lateral limit module is used to close the limit switch and send a limit signal when the displacement of the wheels on both sides of the sand suction bridge in the direction perpendicular to the wheel rail is greater than or equal to a preset threshold. After the limit switch is closed, the sand suction bridge stops running until the displacement of the wheels on both sides of the sand suction bridge in the direction perpendicular to the wheel rail is less than the preset threshold.

[0010] The controller is connected to the longitudinal limiting module, the displacement correction module, the lateral limiting module, and the motors on the two side wheels, respectively, and is used for:

[0011] The operating state of the motors on the two wheels is controlled according to the closing action signal; the operating state includes: stopped operation, forward operation, or reverse operation;

[0012] Adjust the operating frequency of the motor on the corresponding wheel according to L1; adjust the operating frequency of the motor on the corresponding wheel according to L2;

[0013] The operating state of the motors on the two side wheels is controlled according to the limit signal; the operating state includes: stopping operation or starting operation.

[0014] Optionally, the longitudinal limiting module includes:

[0015] A first proximity switch is installed at the first end of the first wheel rail of the sand suction bridge, and is used to perform a closing action and send a closing action signal when the sand suction bridge approaches the first end of the first wheel rail.

[0016] The second proximity switch is installed at the second end of the first wheel rail of the sand suction bridge, and is used to perform a closing action and send a closing action signal when the sand suction bridge approaches the second end of the first wheel rail.

[0017] The third proximity switch is installed at the first end of the second wheel rail of the sand suction bridge, and is used to perform a closing action and send a closing action signal when the sand suction bridge approaches the first end of the second wheel rail.

[0018] The fourth proximity switch is installed at the second end of the second wheel rail of the sand suction bridge, and is used to perform a closing action and send a closing action signal when the sand suction bridge approaches the second end of the second wheel rail.

[0019] Optionally, the displacement correction module includes:

[0020] A fluorescent panel unit, comprising N fluorescent panels; the N fluorescent panels are respectively installed on one side of the first wheel rail and the second wheel rail;

[0021] A first photoelectric limit switch is installed on a first wheel. The emitted light beam from the first photoelectric limit switch is reflected by the fluorescent plate to form a reflected light beam. The first photoelectric limit switch receives the reflected light beam to form a first switch electrical signal.

[0022] The second photoelectric limit switch is installed on the second wheel. The emitted light beam from the second photoelectric limit switch is reflected by the fluorescent plate to form a reflected light beam. The second photoelectric limit switch receives the reflected light beam to form a second switch electrical signal.

[0023] Optionally, the lateral limiting module includes:

[0024] The first lateral limit switch is installed on one side of the first wheel rail of the sand suction bridge. It is used to close the limit switch and send a first limit signal when the displacement of the first wheel of the sand suction bridge in the direction perpendicular to the first wheel rail is greater than or equal to a preset threshold.

[0025] The second lateral limit switch is installed on one side of the second wheel rail of the sand suction bridge. It is used to close the limit switch and send a second limit signal when the displacement of the second wheel of the sand suction bridge in the direction perpendicular to the second wheel rail is greater than or equal to a preset threshold.

[0026] Optionally, the controller includes:

[0027] The first wheel control circuit is used for:

[0028] The operating state of the motor on the first wheel is controlled according to the closing action signals issued by the first proximity switch and the second proximity switch;

[0029] The operating state of the motor on the first wheel is controlled according to the first switch electrical signal generated by the first photoelectric limit switch;

[0030] The operating state of the motor on the first wheel is controlled according to the first limit signal sent by the first lateral limit switch;

[0031] The second wheel control circuit is used for:

[0032] The operating state of the motor on the second wheel is controlled according to the closing action signals issued by the third proximity switch and the fourth proximity switch;

[0033] The operating status of the motor on the second wheel is controlled according to the second switch electrical signal generated by the second photoelectric limit switch;

[0034] The operating status of the motor on the second wheel is controlled according to the second limit signal sent by the second lateral limit switch.

[0035] Optionally,

[0036] The operating modes of the first wheel control circuit include at least one of the following: single manual mode, combined manual mode, and remote mode;

[0037] The operating modes of the second wheel control circuit include at least one of the following: single manual mode, combined manual mode, and remote mode.

[0038] Optionally, both the first wheel control circuit and the second wheel control circuit are equipped with an emergency stop button;

[0039] The emergency stop button is used for emergency braking of the sand suction bridge.

[0040] To achieve the above objectives, embodiments of the present invention also provide the following solutions:

[0041] An automatic correction method for a sand-absorbing bridge includes:

[0042] The system acquires a closing action signal from the longitudinal limit module when the sand suction bridge approaches the end of the wheel rail; after the longitudinal limit module closes, the sand suction bridge stops moving forward or reverses direction.

[0043] Obtain the displacements L1 and L2 of the wheels on both sides of the sand suction bridge issued by the displacement correction module;

[0044] When the displacement of the wheels on both sides of the sand suction bridge in the direction perpendicular to the wheel rail is greater than or equal to a preset threshold, the lateral limit module closes the limit switch and sends a limit signal; after the limit switch closes, the sand suction bridge stops running until the displacement of the wheels on both sides of the sand suction bridge in the direction perpendicular to the wheel rail is less than the preset threshold.

[0045] The operating state of the motors on the two wheels is controlled according to the closing action signal; the operating state includes: stopped operation, forward operation, or reverse operation;

[0046] Adjust the operating frequency of the motor on the corresponding wheel according to L1; adjust the operating frequency of the motor on the corresponding wheel according to L2;

[0047] The operating state of the motors on the two side wheels is controlled according to the limit signal; the operating state includes: stopping operation or starting operation.

[0048] In this embodiment of the invention, the longitudinal limiting module is used to perform a closing action and send a closing action signal when the sand suction bridge approaches the end of the wheel-rail; the displacement correction module is used to adjust the displacement of the two wheels on both sides of the sand suction bridge in the wheel-rail direction, and send the displacements L1 and L2 of the two wheels on both sides of the sand suction bridge respectively; the lateral limiting module is used to close the limit switch and send a limit signal when the displacement of the two wheels on both sides of the sand suction bridge in the direction perpendicular to the wheel-rail is greater than or equal to a preset threshold; when the sand suction bridge is detached or about to detach from the wheel-rail, the limiting is performed, reducing the number of times the sand suction bridge derails. The controller is used to: control the operating state of the motors on both wheels according to the closing action signal; adjust the operating frequency of the motors on the corresponding wheels according to L1 and L2; control the operating state of the motors on both wheels according to the limit signal, improving the efficiency of the sand suction bridge in handling faults, thereby improving the operating efficiency of the sand suction bridge. Attached Figure Description

[0049] To more clearly illustrate the technical solutions in the embodiments of the present 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 the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0050] Figure 1This is a schematic diagram of an automatic correction system for a sand-absorbing bridge provided in an embodiment of the present invention;

[0051] Figure 2 A detailed structural diagram of the longitudinal limiting module provided in an embodiment of the present invention;

[0052] Figure 3 This is a schematic diagram of the motor control circuit on the wheel provided in an embodiment of the present invention;

[0053] Figure 4 The control flowchart of the controller provided in the embodiment of the present invention;

[0054] Figure 5 The main circuit schematic diagram provided for the embodiments of the present invention;

[0055] Figure 6 This is a schematic diagram of the automatic correction method for a sand suction bridge provided in an embodiment of the present invention.

[0056] Symbol explanation:

[0057] Controller-1, longitudinal limit module-2, displacement correction module-3, lateral limit module-4. Detailed Implementation

[0058] 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.

[0059] The purpose of this invention is to provide an automatic correction system and method for sand suction bridges, in order to solve the problems of low efficiency in handling faults and low operating efficiency of existing sand suction bridges due to the high number of derailments.

[0060] 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.

[0061] Figure 1 An exemplary structure of the aforementioned automatic correction system for sand-absorbing bridges is shown. The modules are described in detail below.

[0062] The longitudinal limit module 2 is installed at both ends of the wheel rail of the sand suction bridge. The longitudinal limit module 2 is used to perform a closing action and send a closing action signal when the sand suction bridge approaches the end of the wheel rail. After the longitudinal limit module 2 closes, the sand suction bridge stops moving forward or runs in reverse.

[0063] The longitudinal limiting module 2 includes:

[0064] The first proximity switch is installed at the first end of the first wheel rail of the sand suction bridge. The first proximity switch is used to perform a closing action and send a closing action signal when the sand suction bridge approaches the first end of the first wheel rail.

[0065] The second proximity switch is installed at the second end of the first wheel rail of the sand suction bridge. The second proximity switch is used to perform a closing action and send a closing action signal when the sand suction bridge approaches the second end of the first wheel rail.

[0066] The third proximity switch is installed at the first end of the second wheel rail of the sand suction bridge. The third proximity switch is used to perform a closing action and send a closing action signal when the sand suction bridge approaches the first end of the second wheel rail.

[0067] The fourth proximity switch is installed at the second end of the second wheel rail of the sand suction bridge. The fourth proximity switch is used to perform a closing action and send a closing action signal when the sand suction bridge approaches the second end of the second wheel rail.

[0068] In one example, the longitudinal limiting module 2 uses several sensors installed on the sand suction bridge to perform multi-dimensional positioning of the sand suction bridge, which can realize the intelligence of the system, such as... Figure 2 As shown. The description is as follows:

[0069] A set of longitudinal proximity switches (first proximity switch and second proximity switch) is installed at approximately 1000mm longitudinally and 100mm laterally at each end of the first wheel rail. Similarly, a set of longitudinal proximity switches (third proximity switch and fourth proximity switch) is installed at approximately 1000mm longitudinally and 100mm laterally at each end of the second wheel rail. The proximity switches operate by closing when the wheel approaches them, sending a closing signal. This closing signal serves two purposes: first, it determines whether the wheel is reversing; second, it prevents the wheel from derailing longitudinally.

[0070] The displacement correction module 3 is used to adjust the displacement of the wheels on both sides of the sand suction bridge in the wheel-rail direction, and sends out the displacements L1 and L2 of the wheels on both sides of the sand suction bridge respectively.

[0071] The displacement correction module 3 includes: a fluorescent plate unit, a first photoelectric limit switch, and a second photoelectric limit switch.

[0072] The fluorescent panel unit contains N fluorescent panels; the N fluorescent panels are respectively installed on one side of the first wheel rail and the second wheel rail;

[0073] The first photoelectric limit switch is installed on the first wheel. The emitted light beam from the first photoelectric limit switch is reflected by the fluorescent plate to form a reflected light beam. The first photoelectric limit switch receives the reflected light beam to form a first switch electrical signal.

[0074] The second photoelectric limit switch is installed on the second wheel. The emitted light beam from the second photoelectric limit switch is reflected by the fluorescent plate to form a reflected light beam. The second photoelectric limit switch receives the reflected light beam to form a second switch electrical signal.

[0075] In one example, a square steel support rod is installed parallel to the two wheel rails, with a lateral distance of approximately 200mm between the support rod and the wheel rails. The length of the support rod is the same as the length of the wheel rails, and its height should not exceed the height of the wheel rails. Starting from the longitudinal proximity switch position beside the two wheel rails, several pairs of fluorescent panels, approximately 100mm x 100mm in size, are installed at equal intervals of approximately 200mm on the support rod. The number of fluorescent panels depends on the length of the wheel rails. A set of photoelectric limit switches is installed directly above each of the wheels on both sides of the sand suction bridge, at the same height as the fluorescent panels. The operating mechanism is that during the operation of the sand suction bridge, the light from the photoelectric switches shines onto the fluorescent panels, creating reflected light. After receiving the reflected light, the photoelectric switches output a switch electrical signal to calculate the displacement of the wheels.

[0076] The lateral limit module 4 is used to close the limit switch and send a limit signal when the displacement of the wheels on both sides of the sand suction bridge in the direction perpendicular to the wheel rail is greater than or equal to a preset threshold. After the limit switch is closed, the sand suction bridge stops running until the displacement of the wheels on both sides of the sand suction bridge in the direction perpendicular to the wheel rail is less than the preset threshold.

[0077] Lateral limiting module 4 includes:

[0078] The first lateral limit switch is installed on one side of the first wheel rail of the sand suction bridge. The first lateral limit switch is used to close the limit switch and send a first limit signal when the displacement of the first wheel of the sand suction bridge in the direction perpendicular to the first wheel rail is greater than or equal to a preset threshold.

[0079] The second lateral limit switch is installed on one side of the second wheel rail of the sand suction bridge. The second lateral limit switch is used to close the limit switch and send a second limit signal when the displacement of the second wheel of the sand suction bridge in the direction perpendicular to the second wheel rail is greater than or equal to a preset threshold.

[0080] In one example, a lateral limit switch is installed using a mounting rod protruding from the longitudinal direction of the two wheels, approximately 20mm from the wheel rail. The operating mechanism is that when the sand suction bridge experiences rail climbing or is about to derail, the lateral limit switch contacts the wheel rail and closes. Its function is to prevent the sand suction bridge from derailing laterally.

[0081] Controller 1 is connected to the longitudinal limiting module 2, the displacement correction module 3, the lateral limiting module 4, and the motors on both side wheels. Controller 1 is used for:

[0082] The operating status of the motors on both wheels is controlled according to the closing action signal; the operating status includes: stopped, forward, or reverse.

[0083] Adjust the operating frequency of the motor on the corresponding wheel according to L1; adjust the operating frequency of the motor on the corresponding wheel according to L2;

[0084] The operating status of the motors on both wheels is controlled according to the limit signal; the operating status includes: stop operation or start operation.

[0085] Controller 1 includes:

[0086] The first wheel control circuit is used for:

[0087] The operating status of the motor on the first wheel is controlled according to the closing action signals issued by the first proximity switch and the second proximity switch;

[0088] The operating status of the motor on the first wheel is controlled by the first switch electrical signal generated by the first photoelectric limit switch;

[0089] The operating status of the motor on the first wheel is controlled according to the first limit signal sent by the first lateral limit switch;

[0090] The operating modes of the first wheel control circuit include at least one of the following: single manual mode, combined manual mode and remote mode;

[0091] The second wheel control circuit is used for:

[0092] The operating status of the motor on the second wheel is controlled according to the closing action signals issued by the third and fourth proximity switches;

[0093] The operating status of the motor on the second wheel is controlled by the second switch electrical signal generated by the second photoelectric limit switch;

[0094] The operating status of the motor on the second wheel is controlled according to the second limit signal sent by the second lateral limit switch.

[0095] The operating modes of the second wheel control circuit include at least one of the following: single-unit manual mode, combined manual mode, and remote mode.

[0096] like Figure 3 As shown, the motor on each wheel is designed with at least one of three operating modes: "single manual mode", "joint manual mode" and "remote mode".

[0097] The control circuit operates as follows: the main circuit operates at 220V AC, and FU is an L-line fuse for short-circuit protection. An emergency stop button (SE) is used in the control circuit for emergency system shutdown; status indicator lights include forward running indicator (HG1), reverse running indicator (HG2), fault indicator (HY), and power indicator (HW); thermal relays (FR1, FR2), the first lateral limit switch KAC1, and the second lateral limit switch KAC2 serve as interlocking protection for the circuit. In case of a fault, the control circuit automatically disconnects.

[0098] In one example, the individual manual mode can be used for individual motor adjustment or correction. After the system is powered on, when the mode is switched to individual manual mode, pressing the forward start button (SB1) for motor M1 on the first wheel energizes the KM1 contactor coil. First, the KM1 auxiliary contact closes, and the manual control circuit achieves self-locking. Second, after the auxiliary contact KM1 closes, the KA5 relay is energized, the KA5 contact closes, and the frequency converter starts, causing M1 to be energized and operate, thus M1 runs in the forward direction. When the forward stop button (ST1) for motor M1 on the first wheel is pressed, KM1 is de-energized, and the control circuit self-locking fails.

[0099] In one example, the combined manual mode is used to manually start the sand suction bridge. After the system is powered on, when switching to the combined manual mode and pressing the forward combined start button (SBL1), firstly, the KA1 relay coil is energized, and the auxiliary contact KA1 closes, energizing the contactor coils KM1 and KM3 of the motor M1 on the first wheel and the motor M2 on the second wheel. The auxiliary contact closes to achieve circuit self-locking. Secondly, after the auxiliary contacts KM1 and KM3 close, the KA5 and KA6 relays are energized, and the KA5 and KA6 contacts close, starting the frequency converters B1 and B2, so that the motor M1 on the first wheel and the motor M2 on the second wheel are simultaneously energized and work, thus the sand suction bridge runs in the forward direction.

[0100] When the forward combined stop button (STL1) is pressed, firstly, the coil of relay KA2 is energized, and the normally closed auxiliary contact of KA2 is opened, causing the contactor coils KM1 and KM3 of motor M1 on the first wheel and motor M2 on the second wheel to be de-energized. Their contacts are de-energized, the self-locking of the control circuit fails, and motors M1 on the first wheel and M2 on the second wheel are simultaneously de-energized and stop working, thus stopping the sand suction bridge.

[0101] In one example, remote mode: used by controller 1 to remotely start the sand suction bridge. After the system is powered on, when switching to remote mode, the DO module outputs a digital start command, first energizing the coils of contactors KM1 and KM3, and closing the auxiliary contacts to achieve circuit self-locking; secondly, after the auxiliary contacts KM1 and KM3 close, relays KA5 and KA6 are energized, and the contacts of KA5 and KA6 close, starting inverters B1 and B2, so that M1 and M2 are simultaneously energized and working, and the sand suction bridge runs in the forward direction; when the DO module outputs a digital stop command, first de-energizing the coils of contactors KM1 and KM3, their contacts are de-energized, the control circuit self-locking fails, so that M1 and M2 are simultaneously de-energized and stop working, and the sand suction bridge stops.

[0102] The traditional control method of the sand suction bridge, namely timer control, has been upgraded to PLC (Controller 1) control to achieve a high degree of automation and informatization of the system. Controller 1 is mainly used for: (1) reading digital and analog signals of the system, such as the running status of the motor, the signals of the sensors, and the frequency signals of the frequency converter; (2) sending control commands, such as start commands, stop commands, and frequency setpoints of the frequency converter; (3) intermediate logic calculations, such as pulse accumulation and analog quantity conversion; the specific control logic is described as follows:

[0103] In remote mode, the driving direction of the sand suction bridge can be defined as either forward or reverse. For forward driving, the control flowchart is as follows: Figure 4 As shown.

[0104] First, a device signal self-test is performed, and controller 1 reads the limit switch signal;

[0105] If the signal is normal, that is, no equipment fault signal is received, start both motors at a frequency of 50Hz simultaneously.

[0106] During the operation of the sand suction bridge, the cumulative photoelectric limit switch pulse signals are monitored. When the wheels pass over the fluorescent panels, the photoelectric limit switches output pulse signals to the PLC. The PLC can indirectly calculate the displacement at both ends of the track by accumulating the pulse quantity. The displacements on both sides of the sand suction bridge are defined as L1 and L2, and the displacement difference ΔL is calculated. The calculation process is as follows: L1 = n1·L, L2 = n2·L, where n is the number of pulses and L is the spacing between the fluorescent panels;

[0107] For example, when ΔL exceeds the allowable displacement difference of 200mm, the PLC control program is started to adjust the frequency converter. The adjustment method is as follows:

[0108] If L1 > L2, inverter 1 reduces the frequency using PID control, while inverter 2 remains at 50Hz, shortening the shift ΔL. When ΔL is zero, the frequency of both inverters is restored to 50Hz.

[0109] If L1 < L2, inverter 2 reduces its frequency using PID control, while inverter 1 remains at 50Hz, shortening the shift ΔL. When ΔL is zero, the frequency of both inverters is restored to 50Hz. When the sand suction bridge reaches the end and receives a signal from the longitudinal proximity switch, if no imbalance occurs, it stops first and then issues a return start command to start the sand suction bridge. If imbalance occurs, the PLC control program is started first to adjust the inverter frequency, then it stops, and then issues a return start command to start the sand suction bridge.

[0110] When driving in the opposite direction, the control method is the same as that for driving in the forward direction, and will not be described again.

[0111] Both the first and second wheel control circuits are equipped with emergency stop buttons; the emergency stop buttons are used for emergency braking of the sand suction bridge.

[0112] In one example, a traditional motor control system is upgraded. The traditional control loop is a dual-motor single-loop system with direct contactor starting. The upgrade is to a dual-motor dual-loop system using frequency converter starting. The main circuit schematic is shown below. Figure 5 As shown.

[0113] Figure 5 There are two main circuits. Taking the working principle of motor M1 as an example (motor M2 works on the same principle as M1), the main circuit operates at AC 380V and uses a three-phase five-wire star connection. QF is the main circuit breaker, FU1-3 are three-phase fuses for overload or short circuit protection, QF1 and QF2 are branch circuit breakers for the two motors respectively, KM1 is the forward running contactor for motor 1, KM2 is the reverse running contactor for motor 1, FR1 is the thermal relay for motor 1 to prevent faults caused by overheating of electrical equipment, B1 is the frequency converter, and M1 is the motor load.

[0114] When QF and QF1 are powered on, under the control of the control circuit, if the KM1 contactor coil is energized, the KM1 auxiliary contact will first close; secondly, after the KM1 auxiliary contact closes, the KA5 relay will be energized, the KA5 contact will close, and the frequency converter will start; finally, under the control of the PLC, the frequency converter will output voltage, which will energize the motor M1, causing the sand suction bridge to run in the forward direction. The reverse running principle is similar.

[0115] In summary, in this embodiment of the invention, the longitudinal limiting module is used to perform a closing action and send a closing action signal when the sand suction bridge approaches the end of the wheel-rail; the displacement correction module is used to adjust the displacement of the two wheels on both sides of the sand suction bridge in the wheel-rail direction, and send the displacements L1 and L2 of the two wheels on both sides of the sand suction bridge respectively; the lateral limiting module is used to close the limit switch and send a limit signal when the displacement of the two wheels on both sides of the sand suction bridge in the direction perpendicular to the wheel-rail is greater than or equal to a preset threshold; when the sand suction bridge is detached or about to detach from the wheel-rail, the limiting is performed, reducing the number of times the sand suction bridge derails. The controller is used to: control the operating state of the motors on both wheels according to the closing action signal; adjust the operating frequency of the motors on the corresponding wheels according to L1 and L2; control the operating state of the motors on both wheels according to the limit signal, improving the efficiency of the sand suction bridge in handling faults, thereby improving the operating efficiency of the sand suction bridge.

[0116] The invention has the following advantages: (1) It adopts photoelectric sensor technology to locate the sand suction bridge in multiple dimensions, so that the sand suction bridge is always within the controllable range, which solves the pain point of sand suction bridge derailment in the water treatment industry and fills the gap in intelligent handling solutions for this type of problem; (2) The embodiment of the invention adopts dual motors and dual circuits and uses frequency converters for starting, so that the control effect is more precise; (3) It adopts PLC control system technology and combines sensors to automatically monitor the sand suction bridge, so that the sand suction bridge is in a balanced and stable state, which is more automated than the traditional control system and reduces the labor cost for the operator.

[0117] To achieve the above objectives, embodiments of the present invention also provide the following solutions:

[0118] For an automatic correction method for sand suction bridges, please refer to [link / reference]. Figure 6 ,include:

[0119] Step 11: Obtain the closing action signal sent by the longitudinal limit module when the sand suction bridge approaches the end of the wheel rail; after the longitudinal limit module closes, the sand suction bridge stops moving forward or reverses.

[0120] Step 12: Obtain the displacements L1 and L2 of the wheels on both sides of the sand suction bridge from the displacement correction module;

[0121] Step 13: When the displacement of the wheels on both sides of the sand suction bridge in the direction perpendicular to the wheel rail is greater than or equal to a preset threshold, the limit signal sent by the lateral limit module closing the limit switch is obtained; after the limit switch is closed, the sand suction bridge stops running until the displacement of the wheels on both sides of the sand suction bridge in the direction perpendicular to the wheel rail is less than the preset threshold.

[0122] Step 21: Control the operating state of the motors on both wheels according to the closing action signal; the operating state includes: stopped operation, forward operation, or reverse operation;

[0123] Step 22: Adjust the operating frequency of the motor on the corresponding wheel according to L1; adjust the operating frequency of the motor on the corresponding wheel according to L2;

[0124] Step 23: Control the operating state of the motors on the two side wheels according to the limit signal; the operating state includes: stop operation or start operation.

[0125] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the systems disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the descriptions are relatively simple; relevant parts can be referred to the method section.

[0126] This document uses specific examples to illustrate the principles and implementation methods of the embodiments of the present invention. The descriptions of the embodiments above are only for the purpose of helping to understand the methods and core ideas of the embodiments of the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of the embodiments of the present invention. In summary, the content of this specification should not be construed as a limitation on the embodiments of the present invention.

Claims

1. An automatic correction system for a sand-absorbing bridge, characterized in that, include: The longitudinal limiting module is installed at both ends of the sand suction bridge wheel rail. It is used to perform a closing action and send a closing action signal when the sand suction bridge approaches the end of the wheel rail. After the longitudinal limiting module closes, the sand suction bridge stops moving forward or reverses. The displacement correction module is used to adjust the displacement of the wheels on both sides of the sand suction bridge in the wheel-rail direction, and outputs the displacements L1 and L2 of the wheels on both sides of the sand suction bridge respectively. The lateral limit module is used to close the limit switch and send a limit signal when the displacement of the wheels on both sides of the sand suction bridge in the direction perpendicular to the wheel rail is greater than or equal to a preset threshold. After the limit switch is closed, the sand suction bridge stops running until the displacement of the wheels on both sides of the sand suction bridge in the direction perpendicular to the wheel rail is less than the preset threshold. The controller is connected to the longitudinal limiting module, the displacement correction module, the lateral limiting module, and the motors on the two side wheels, respectively, and is used for: The operating state of the motors on the two wheels is controlled according to the closing action signal; the operating state includes: stopped operation, forward operation, or reverse operation; Adjust the operating frequency of the motor on the corresponding wheel according to L1; adjust the operating frequency of the motor on the corresponding wheel according to L2; The operating state of the motors on the two side wheels is controlled according to the limit signal; the operating state includes: stopping operation or starting operation; The longitudinal limiting module includes: A first proximity switch is installed at the first end of the first wheel rail of the sand suction bridge, and is used to perform a closing action and send a closing action signal when the sand suction bridge approaches the first end of the first wheel rail. The second proximity switch is installed at the second end of the first wheel rail of the sand suction bridge, and is used to perform a closing action and send a closing action signal when the sand suction bridge approaches the second end of the first wheel rail. The third proximity switch is installed at the first end of the second wheel rail of the sand suction bridge, and is used to perform a closing action and send a closing action signal when the sand suction bridge approaches the first end of the second wheel rail. The fourth proximity switch is installed at the second end of the second wheel rail of the sand suction bridge, and is used to perform a closing action and send a closing action signal when the sand suction bridge approaches the second end of the second wheel rail; The displacement correction module includes: A fluorescent panel unit, comprising N fluorescent panels; the N fluorescent panels are respectively installed on one side of the first wheel rail and the second wheel rail; A first photoelectric limit switch is installed on a first wheel. The emitted light beam from the first photoelectric limit switch is reflected by the fluorescent plate to form a reflected light beam. The first photoelectric limit switch receives the reflected light beam to form a first switch electrical signal. The second photoelectric limit switch is installed on the second wheel. The emitted light beam from the second photoelectric limit switch is reflected by the fluorescent plate to form a reflected light beam. The second photoelectric limit switch receives the reflected light beam to form a second switch electrical signal. The controller is a PLC. During the movement of the sand suction bridge, the cumulative photoelectric limit switch pulse signals are monitored. When the wheels pass over the fluorescent panels, the photoelectric limit switches output pulse signals to the PLC. The PLC indirectly calculates the displacement at both ends of the track through the cumulative pulse quantity, defines the displacements on both sides of the sand suction bridge as L1 and L2, and calculates the displacement difference ΔL. The calculation process is as follows: L1 = n1·L, L2 = n2·L, where n is the number of pulses and L is the spacing between the fluorescent panels. When ΔL exceeds the allowable displacement difference, the PLC control program is started to adjust the frequency of the inverters. The adjustment method is as follows: if L1 > L2, inverter 1 reduces the frequency through PID control, while inverter 2 keeps the frequency unchanged, shortening the displacement difference ΔL; if L1 < L2, inverter 2 reduces the frequency through PID control, while inverter 1 keeps the frequency unchanged, shortening the displacement difference ΔL.

2. The automatic correction system for the sand suction bridge according to claim 1, characterized in that, The lateral limiting module includes: The first lateral limit switch is installed on one side of the first wheel rail of the sand suction bridge. It is used to close the limit switch and send a first limit signal when the displacement of the first wheel of the sand suction bridge in the direction perpendicular to the first wheel rail is greater than or equal to a preset threshold. The second lateral limit switch is installed on one side of the second wheel rail of the sand suction bridge. It is used to close the limit switch and send a second limit signal when the displacement of the second wheel of the sand suction bridge in the direction perpendicular to the second wheel rail is greater than or equal to a preset threshold.

3. The automatic correction system for the sand suction bridge according to claim 2, characterized in that, The controller includes: The first wheel control circuit is used for: The operating state of the motor on the first wheel is controlled according to the closing action signals issued by the first proximity switch and the second proximity switch; The operating state of the motor on the first wheel is controlled according to the first switch electrical signal generated by the first photoelectric limit switch; The operating state of the motor on the first wheel is controlled according to the first limit signal sent by the first lateral limit switch; The second wheel control circuit is used for: The operating state of the motor on the second wheel is controlled according to the closing action signals issued by the third proximity switch and the fourth proximity switch; The operating status of the motor on the second wheel is controlled according to the second switch electrical signal generated by the second photoelectric limit switch; The operating status of the motor on the second wheel is controlled according to the second limit signal sent by the second lateral limit switch.

4. The automatic correction system for the sand suction bridge according to claim 3, characterized in that, The operating modes of the first wheel control circuit include at least one of the following: single manual mode, combined manual mode, and remote mode; The operating modes of the second wheel control circuit include at least one of the following: single manual mode, combined manual mode, and remote mode.

5. The automatic correction system for the sand suction bridge according to claim 4, characterized in that, Both the first wheel control circuit and the second wheel control circuit are equipped with emergency stop buttons; The emergency stop button is used for emergency braking of the sand suction bridge.

6. A method for automatic correction of a sand-absorbing bridge, characterized in that, The automatic correction method for the sand-absorbing bridge is applied to the automatic correction system for the sand-absorbing bridge according to claim 1, and the automatic correction method for the sand-absorbing bridge includes: The system acquires a closing action signal from the longitudinal limit module when the sand suction bridge approaches the end of the wheel rail; after the longitudinal limit module closes, the sand suction bridge stops moving forward or reverses direction. Obtain the displacements L1 and L2 of the wheels on both sides of the sand suction bridge issued by the displacement correction module; When the displacement of the wheels on both sides of the sand suction bridge in the direction perpendicular to the wheel rail is greater than or equal to a preset threshold, the lateral limit module closes the limit switch and sends a limit signal; after the limit switch closes, the sand suction bridge stops running until the displacement of the wheels on both sides of the sand suction bridge in the direction perpendicular to the wheel rail is less than the preset threshold. The operating state of the motors on the two wheels is controlled according to the closing action signal; the operating state includes: stopped operation, forward operation, or reverse operation; Adjust the operating frequency of the motor on the corresponding wheel according to L1; adjust the operating frequency of the motor on the corresponding wheel according to L2; The operating state of the motors on the two side wheels is controlled according to the limit signal; the operating state includes: stopping operation or starting operation.

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