Bridge type sand sucker fault early warning device and system in buried sewage treatment system

Abstract

The invention discloses a bridge type sand sucker fault early warning device in a buried sewage treatment system, which comprises a grit chamber, two rails arranged on two opposite sides of the grit chamber in parallel, a truss, two driving motors, a controller, a current sensor and a torque sensor, wherein the current sensor is used for acquiring the magnitude of current when the driving motor runs, and sending the acquired data to the controller; the torque sensor is used for acquiring the output torque of the driving end of the driving motor and transmitting the acquired data to the controller; when the controller receives that the running current or the output torque of the driving motor is larger than a set value, the controller gives an alarm, and meanwhile the controller closes the driving motor. The running state of the driving motor is visually monitored in real time through the current sensor and the torque sensor, and when the running state of the driving motor is changed, the early warning device can send out an alarm signal in time, stop running of the driving motor, stop loss in time and immediately inform maintenance personnel to carry out maintenance treatment in time.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sewage treatment, in particular to a bridge type sand suction machine fault early warning device and system in a buried sewage treatment system. BACKGROUND

[0002] The existing bridge type sand suction machine will be provided with a protection device in actual application, but this protection device is a front and rear limiting protection device, which is generally arranged at the end of the track. When the bridge type sand suction machine travels to the limiting position, the sand suction machine automatically stops traveling. The function of this protection device is to avoid the situation that the sand suction machine continuously travels on the track and then falls off the track. However, this protection device relies on front and rear limiting to trigger stop, and can only stop running when the equipment reaches the preset physical limit. In actual application scenarios, when the sand pool is hardened, the travel of the bridge type sand suction machine is blocked, and the existing protection device cannot timely warn of the occurrence of this situation, so that the sand suction machine cannot stop in time, and continues to force forward, which eventually leads to derailment, structural deformation and even overall rollover accidents.

[0003] Especially when the bridge type sand suction machine is installed in a position that is not easy to observe with the naked eye, the operator often realizes that the bridge type sand suction machine has failed only when a loud noise is produced in the accident, and then infers that the sand pool has hardened. This results in that when the operator discovers it, the bridge type sand suction machine has already occurred a relatively serious failure, and the existing protection measures do not play any protection role and failure prompt. Therefore, when repairing, the equipment has already been severely damaged, and the repair cost is high. SUMMARY

[0004] In view of the above deficiencies in the prior art, the purpose of the present application is to provide a bridge type sand suction machine fault early warning device and system in a buried sewage treatment system, so as to solve the problem that the protection device of the bridge type sand suction machine in the prior art cannot timely warn when the sand pool is hardened, resulting in that the operator discovers the failure has occurred, the equipment is severely damaged, and the repair cost is high.

[0005] In order to solve the above technical problems, the present application adopts the following technical scheme: The application discloses a bridge type sand suction machine fault early warning device in a buried sewage treatment system, which comprises a grit chamber, two rails arranged in parallel on opposite sides of the grit chamber, a truss, two driving motors and a controller, the truss is located above the rails and the length direction of the truss is perpendicular to the length direction of the rails; a rotating wheel is arranged at each end of the truss along the length direction of the truss, the rotating wheel is clamped on the rail, and the truss can move along the length direction of the rail through the rotating wheel; the two driving motors are located on the truss and correspond to positions above the rails, the driving motor is fixedly connected with the truss, and the driving end of the driving motor is rotationally connected with the rotating wheel through a speed reducer; the driving motor can drive the rotating wheel to rotate, so that the truss slides along the length direction of the rail; the bridge type sand suction machine fault early warning device further comprises a current sensor and a torque sensor; the current sensor is arranged in one-to-one correspondence with the driving motor and connected with the driving motor, is used for acquiring the current of the driving motor during operation, and sends the acquired data to the controller; the torque sensor is arranged in one-to-one correspondence with the driving motor and connected with the driving motor, is used for acquiring the output torque of the driving end of the driving motor, and sends the acquired data to the controller. When the controller receives the running current or the output torque of the driving motor greater than the set value, the controller issues an alarm, and the controller closes the driving motor.

[0006] Preferably, when the controller receives the running current or the output torque of the driving motor continuously increasing but less than the set value, the controller issues an alarm signal but does not close the driving motor.

[0007] Preferably, the bridge type sand suction machine fault early warning device further comprises two rotating wheel speed meters, the rotating wheel speed meters are installed on the rotating wheels and are used for acquiring the rotating speed of the rotating wheels during rotation; the rotating wheel speed meters are connected with the controller and send the acquired data to the controller. When the controller monitors that the rotating speeds of the two rotating wheel speed meters are different and the rotating speed difference of the two rotating wheels is greater than the set value, the controller closes the driving motor and issues an alarm signal.

[0008] Preferably, when the controller monitors that the rotating speeds of the two rotating wheel speed meters are different and the rotating speed difference of the two rotating wheels is less than the set value, the controller issues an alarm signal but does not close the driving motor.

[0009] Preferably, a level meter is further arranged on the truss, the level meter is connected with the controller circuit, and the level meter is used for detecting whether the truss is in a horizontal state and sending the state signal of the truss to the controller. When the controller monitors that the truss is in a non-horizontal state, the controller closes the driving motor and issues an alarm signal.

[0010] The application provides a bridge type sand suction machine fault early warning system in a buried sewage treatment system, which is used for the early warning system of the early warning device and comprises a data acquisition module, a data processing module and an alarm module. The data acquisition module is used for acquiring data monitored by the level meter, the speed meter, the current sensor and the torque sensor, and sending the acquired data to the data processing module; the data processing module is used for comparing the monitoring data with the set value, and when the monitoring data is different from the set value or is not within the set value range, the received monitoring data is displayed through the display screen, the driving motor is closed, and a signal is sent to the alarm module; the alarm module is used for sending an alarm signal after receiving the signal of the data processing module.

[0011] Compared with the prior art, the present application has the following beneficial effects: The present application finds that when the sand pool is hardened, the influence of different stages on the bridge type sand suction machine is different, the running resistance of the truss significantly increases in the initial stage, but many times it does not change the horizontal state of the truss, if timely warning can be made at this time, the accident can be nipped in the bud in the initial stage; for this reason, the present application considers further predicting the occurrence of the sand pool hardening phenomenon, the running state of the bridge type sand suction machine is monitored in time through the current sensor and the torque sensor, the running resistance of the truss increases in the initial stage of the sand pool hardening phenomenon, which will cause problems such as current overrun, temperature rise and the like caused by continuous overload operation of the driving motor, although these abnormalities do not mean that the bridge type sand suction machine fails, but the abnormality of these monitoring data often means that the hardening phenomenon begins to appear, which can remind the operator to pay attention to the running state of the bridge type sand suction machine in real time, and also can remind the operator to timely process the hardening condition in the sand pool, avoiding its continuous development to affect the running of the bridge type sand suction machine; subsequently, cooperating with real-time monitoring of the rotating speed of the rotating wheel and the horizontal state of the truss, when the rotating speed difference of the rotating wheel is greater than the set value or the horizontal state of the truss changes, the warning device can timely send an alarm signal and stop the driving motor from running, timely loss prevention and immediately inform the maintenance personnel to timely maintenance processing, avoiding the equipment from being damaged irreparably, reducing the operation cost and the maintenance cost. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is a structural schematic view of the bridge type sand suction machine fault warning device in the buried sewage treatment system.

[0013] Figure 2 It is a schematic view for calculating the included angle a.

[0014] In the figure: sand pool 1, track 2, truss 3, rotating wheel 4, level meter 5, speed meter 6, transmitting member I 7, receiving member I 8, transmitting member II 9, receiving member II 10. DETAILED DESCRIPTION

[0015] The technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the present application belong to the scope of protection of the present application.

[0016] Unless otherwise specified in specific cases, the numerical ranges listed in the present application include upper and lower limits, and all integers and fractions within the range, and are not limited to the specific values listed in the defined range.

[0017] One kind is buried sewage treatment system in bridge type sand suction machine fault early warning device The bridge type sand suction machine fault early warning device provided by the present application comprises a grit chamber 1, two tracks 2 parallel to opposite sides of the grit chamber, a truss 3, two drive motors and a controller, the truss is located above the tracks and the length direction of the truss is perpendicular to the length direction of the tracks; a runner 4 is arranged at each end of the truss along the length direction of the truss, the runner is engaged on the track, and the truss can move along the length direction of the track through the runner; the two drive motors are located on the truss and correspond to the positions above the tracks, the drive motors are fixedly connected with the truss, and the driving end of the drive motor is connected with the runner in rotation through a speed reducer; the drive motor can drive the runner to rotate, so that the truss slides along the length direction of the track. Further comprising a current sensor and a torque sensor; wherein the current sensor is arranged one-to-one corresponding to the drive motor and connected with the drive motor, for acquiring the current size when the drive motor operates, and sending the acquired data to the controller; the torque sensor is arranged one-to-one corresponding to the drive motor and connected with the drive motor, for acquiring the output torque of the driving end of the drive motor, and sending the acquired data to the controller; when the controller receives the operating current or the output torque of the drive motor greater than the set value, the controller issues an alarm, and the controller closes the drive motor at the same time.

[0018] The application makes a deep research on the practical application of the bridge type sand suction machine, and finds that when the sand pool is hardened, the influence of the different stages of hardening on the bridge type sand suction machine is different. Especially, when the bridge type sand suction machine is used in the underground sewage treatment system, since the whole sewage treatment system is built in the underground mode, the operator cannot directly observe the running state of the bridge type sand suction machine during the patrol process. Even if an observation hole or a camera is set, due to the limitation of the underground structure, the viewing angle of the observation hole or the camera is usually limited, and the overall running state of the bridge type sand suction machine cannot be observed in all directions, so that even if the hardening phenomenon occurs in the sand pool, the running abnormality of the bridge type sand suction machine cannot be found during the patrol process, which makes the operator know the fault only when it has occurred, and finally causes the equipment to be unable to be treated in time after the fault occurs. In the early stage of the hardening development, the running resistance of the truss is significantly increased, but the truss can still run normally at this time, and sometimes the further development of the hardening in the sand pool can be destroyed through the reciprocating operation of the sand suction machine, but the operator needs to pay attention to the running state of the bridge type sand suction machine and can judge the development state of the hardening phenomenon in the sand pool. Therefore, the application monitors the running state of the driving motor in real time through the current sensor and the torque sensor. When the hardening occurs in the sand pool and is in the early stage, the running state of the driving motor directly reflects the development state of the hardening in the sand pool. When the controller monitors that the running current or output torque of the driving motor is greater than the set value, the controller issues an alarm, and at the same time, the controller shuts down the driving motor to avoid the driving motor from continuously outputting high power under large resistance and causing derailment phenomenon, which not only protects the motor from being burned out, but also protects the truss from being damaged due to derailment. At the same time, when the controller receives that the running current or output torque of the driving motor continuously increases and is less than the set value, the controller issues an alarm signal, but does not shut down the driving motor, which indicates that the hardening phenomenon has occurred in the sand pool, reminding the operator to pay attention to the running state of the sand suction machine in real time, and according to the actual situation, considering whether the driving motor needs to be shut down and whether the hardening phenomenon in the sand pool needs to be treated in time.

[0019] In some embodiments of the present invention, two rotor tachometers 6 are further included. The rotor tachometers are mounted on the rotor and are used to obtain the rotational speed of the rotor during rotation. The rotor tachometers are connected to a controller and transmit the obtained data to the controller. When the controller detects that the rotational speeds of the two rotor tachometers are different, and the speed difference between the two rotors is greater than a set value, the controller shuts down the drive motor and issues an alarm signal. The present invention also monitors the rotational speeds of the two rotors in real time. When the controller detects that the operating speeds measured by the two tachometers are different, but the speed difference between the two rotors is less than a set value, the controller also issues an alarm. This indicates that the two ends of the truss are not moving synchronously, and the operator needs to be reminded to promptly check the operating status of the truss and determine whether the truss status needs to be corrected based on the actual situation.

[0020] In some embodiments of the present invention, a level 5 is also provided on the truss 3. The level 5 is connected to the controller circuit and is used to detect whether the truss is horizontal and transmit the truss status signal to the controller. When the controller detects that the truss is not horizontal, the controller shuts down the drive motor and issues an alarm signal. Once the truss is not horizontal, it indicates that derailment is imminent. Monitoring the truss status is, in fact, the last line of defense for the early warning system. If any of the monitoring devices, including the current sensor, torque sensor, and wheel tachometer, fails, the level can still monitor the truss status in real time and shut down the drive motor in a timely manner if the truss is about to derail.

[0021] In some embodiments of the present invention, a distance sensor I and a distance sensor II are further provided on the truss 3. Distance sensor I and distance sensor II are respectively located on the upper side of the two ends of the truss along its length direction and are fixedly connected to the truss. The straight-line distance between distance sensor I and distance sensor II is consistent with the length direction of the truss. Distance sensor I and distance sensor II are respectively used to measure the straight-line distances L1 and L2 between the two ends of the truss and the two ends of the grit chamber along its width direction, and send the detected data to the controller. Distance sensor I and distance sensor II are both infrared distance sensors. Specifically: Figure 2As shown, the transmitting member I 7 of the distance sensor I is arranged at one end of the truss along the length direction thereof, and the receiving member I 8 is arranged at the other end of the grit chamber along the width direction thereof and at a position corresponding to the transmitting member I, so that the distance sensor I can measure the distance L1. The transmitting member II 9 of the distance sensor II is arranged at the other end of the truss along the length direction thereof, and the receiving member II 10 is arranged at the other end of the grit chamber along the width direction thereof and at a position corresponding to the transmitting member II, so that the distance sensor II can measure the distance L2. Meanwhile, the distance L3 between the receiving member I and the receiving member II is known, and the controller can calculate L4 according to L1 and L2, and calculate the size of the included angle a according to L3 and L4, so as to calculate the offset angle of the truss relative to the width direction of the grit chamber, and finally obtain the specific state of the truss when the offset occurs. In fact, when one end of the truss is offset, the transmitting member at the end will have a certain offset along the length direction of the grit chamber, but the offset angle is very small and can be ignored. The controller receives the data sent by the distance sensor I and the distance sensor II, compares L1 and L2, calculates the size of the included angle a according to the above calculation method when the values of L1 and L2 are different, and displays the size of the included angle a on the display screen. Meanwhile, when the included angle is greater than 0.22°, that is, the horizontal offset of the truss is greater than 0.1 meters, the equipment will be obviously inclined under this offset, and there is a derailment sign, so the controller immediately shuts down the driving motor and sends an alarm signal. In actual operation, since the bridge-type sand suction machine is installed on the grit chamber in the buried sewage treatment system, even if the truss of the bridge-type sand suction machine is offset, the operator cannot know the status thereof. When the controller detects that the values of L1 and L2 are different and shuts down the driving motor, the controller can calculate the size of the included angle a at the same time, so that the operator can know the specific state of the truss when it is shut down, which is beneficial to the operator to select a specific treatment method according to the actual situation.

[0022] In some embodiments of the present application, a distance sensor III is arranged above one of the outer sides of the rotating wheel and corresponds to one end of the truss along the length direction of the truss. The transmitting component III of the distance sensor III is arranged on the truss, and the receiving component III is arranged on the outer side of the rotating wheel away from the track. The distance sensor III is used to measure the linear distance between the truss and the rotating wheel and send a data signal to the controller. When the controller monitors that the linear distance is greater than or less than a threshold value, the controller turns off the driving motor and sends an alarm signal. In actual application, when the actual linear distance between the truss and the rotating wheel is greater than or less than the threshold value by more than 0.05 meters, it indicates that the offset angle of one end of the truss along the length direction of the truss with respect to the horizontal plane is greater than 0.11°, that is, one end of the truss has a tendency to lift and is in a unilateral inclined state, indicating a derailment sign. The controller immediately turns off the driving motor and sends an alarm signal. The distance sensor III is used to monitor whether one end of the truss is raised. Once it is raised, the controller turns off the driving motor in time to prevent the truss from derailing completely.

[0023] In some embodiments of the present application, at least one set of board breaking device is further arranged on the truss. The board breaking device comprises at least one propeller, a connecting rod and a rotating motor. The rotating motor is arranged on the truss and fixedly connected with the truss. The driving shaft of the rotating motor is arranged towards the sand pool, and the axis direction of the driving shaft is perpendicular to the length direction of the truss. One end of the connecting rod is fixedly connected with the driving shaft of the rotating motor, and the other end is fixedly connected with the rotating shaft of the propeller. The axis of the driving shaft of the rotating motor, the axis of the connecting rod and the axis of the propeller coincide. The propeller extends into the sand pool and is close to the bottom of the sand pool. When the rotating motor is started, the driving end can drive the connecting rod to rotate around its axis, and then drive the propeller to rotate around its axis. The rotation of the propeller can agitate the bottom of the sand pool, avoid the continuous development of the board phenomenon and affect the operation of the bridge type sand suction machine. The control of the board breaking device can be controlled by the controller or by the operator starting the current switch of the rotating motor. When the controller is used for control, the rotating motor is connected with the controller circuit. When the controller receives the driving current or output torque of the driving motor which continuously increases but is less than the set value, the controller starts the rotating motor to drive the propeller to rotate, breaks the board phenomenon at the bottom of the sand pool, and avoids the continuous development of the board phenomenon and affects the operation of the bridge type sand suction machine.

[0024] In specific implementation, the present application monitors the running state of the bridge type sand suction machine in time through the current sensor and the torque sensor, and displays and processes these abnormal data in the first time, reminding the operator that the board consolidation phenomenon begins to appear and the running state of the bridge type sand suction machine needs to be noticed in real time, and reminding the operator to process the board consolidation in the sand trap in time to avoid its continuous development affecting the running of the bridge type sand suction machine; then, cooperating with the real-time monitoring of the rotating speed of the rotating wheel and the horizontal state of the truss, when the rotating speed difference of the rotating wheel is greater than the set value or the horizontal state of the truss changes, the early warning device can timely send an alarm signal and stop the driving motor from running, timely stop loss and immediately inform the maintenance personnel to timely maintenance processing, avoiding the equipment from incurring irreparable damage, reducing the operation cost and the maintenance cost. Furthermore, the distance sensor I, the distance sensor II and the distance sensor III can also timely know the specific state when the truss deviates or rises, not only can timely close the driving motor when the state of the truss is abnormal, avoiding further damage to the equipment, but also can help the operator to know the real-time state of the truss of the bridge type sand suction machine installed in the buried sewage treatment system, providing help for the maintenance personnel to enter the buried structure to maintain the bridge type sand suction machine.

[0025] Two, a bridge type sand suction machine fault early warning system in a buried sewage treatment system The present application also provides an early warning system for the above early warning device, comprising a data acquisition module, a data processing module and an alarm module; wherein the data acquisition module is used for acquiring the data monitored by the level meter, the speed meter, the current sensor and the torque sensor, and sending the acquired data to the data processing module; the data processing module is used for comparing the monitoring data with the set value, when the monitoring data is different from the set value or not within the set value range, displaying the received monitoring data through the display screen, closing the driving motor, and sending a signal to the alarm module; the alarm module is used for sending an alarm signal after receiving the signal of the data processing module.

[0026] Working process: when the truss of the bridge type sand suction machine starts normal operation, the current sensor obtains the current size when the driving motor is running, and sends it to the data acquisition module; the data acquisition module sends the obtained data to the data processing module, the data processing module processes the obtained monitoring data, judges the size of the current value when the driving motor is running and the set value; the torque sensor obtains the output torque of the driving end of the driving motor in real time, and sends the monitoring data to the data acquisition module, the data acquisition module sends the obtained data to the data processing module, the data processing module processes the obtained monitoring data, judges the size of the output torque of the driving end of the driving motor and the set value. The rotating speed of the runner is obtained in real time, and the rotating speed signal is sent to the data acquisition module, the data acquisition module sends the obtained data to the data processing module, the data processing module processes the obtained monitoring data, judges the size of the rotating speed difference of the two runners and the set value; the level instrument obtains the running state of the truss in real time, and sends the state signal of the truss to the data acquisition module. After receiving the signal of the data processing module, the alarm module sends an alarm signal, and prompts the source position of the abnormal data.

[0027] When the current and output torque of the driving motor continue to increase but do not exceed the set value, and the runner speedometer does not show that the rotating speeds of the two runners are different, the data processing module displays the obtained data in red on the display screen, and informs the operator that there may be a risk of consolidation in the sand trap, so that the operator can pay attention to the real-time situation in the sand trap through these data changes. When the current and output torque of the driving motor continue to increase but do not exceed the set value, and the runner speedometer also shows that the rotating speeds of the two runners are different, but the rotating speed difference is less than the set value, but the level instrument shows that the truss is still in a horizontal state, the data processing module prompts through the display screen that the consolidation phenomenon in the sand trap is in a continuous development state, and the two ends of the truss are in a non-synchronous running state, please the operator to judge whether the driving motor needs to be closed according to the actual situation to correct the state of the truss.

[0028] When the current or output torque of the driving motor is greater than the set value, the data processing module closes the driving motor and sends a signal to the alarm module; when the rotating speed difference of the two runners is greater than the set value, whether the current or output torque of the driving motor is greater than the set value, the data processing module closes the driving motor and sends a signal to the alarm module; when the controller monitors that the truss is in a non-horizontal state, the controller closes the driving motor and sends an alarm signal. The alarm module is used to send an alarm signal after receiving the signal of the data processing module.

[0029] The application can monitor the running state of the bridge type sand suction machine in time through the current sensor and the torque sensor. When the setting phenomenon of the sand pool occurs in the initial stage, the running resistance of the truss increases, which can cause the continuous overload operation of the driving motor, the current over-limit and the temperature rise, etc. Although these abnormalities do not mean that the bridge type sand suction machine fails, the abnormality of these monitoring data often means that the setting phenomenon begins to appear, which can remind the operator to pay attention to the running state of the bridge type sand suction machine in time, and can remind the operator to process the setting condition in the sand pool in time, so as to avoid the continuous development of the setting condition and affect the running of the bridge type sand suction machine. Then, the real-time monitoring of the rotating speed of the rotating wheel and the horizontal state of the truss is combined. When the rotating speed difference of the rotating wheel is greater than the set value or the horizontal state of the truss changes, the early warning device can send an alarm signal in time, and stop the running of the driving motor, so as to stop the loss in time, immediately inform the maintenance personnel to maintain and process in time, avoid the irreparable damage of the equipment, and reduce the operation cost and the maintenance cost.

[0030] Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present application, but not to limit the technical solutions. Those skilled in the art should understand that the technical solutions of the present application can be modified or replaced equivalently without departing from the purpose and scope of the present application, which should be covered in the scope of the claims of the present application.

Claims

1. A fault warning device for a bridge-type sand suction machine in an underground sewage treatment system, comprising a sand settling tank (1), two tracks (2) arranged parallel to opposite sides of the sand settling tank, a truss (3), two drive motors and a controller, wherein the truss is located above the track and the length direction of the truss is perpendicular to the length direction of the track; a rotating wheel (4) is provided at each end of the truss along its length direction, the rotating wheel is engaged with the track, and the truss can move along the length direction of the track through the rotating wheel; two drive motors are located on the truss and at positions above the corresponding track, the drive motors are fixedly connected to the truss, and the driving ends of the drive motors are rotationally connected to the rotating wheel through a reducer; the drive motors can drive the rotating wheel to rotate, so that the truss slides along the length direction of the track; It is characterized by: It also includes a current sensor and a torque sensor; wherein the current sensor is set in a one-to-one correspondence with the drive motor and is connected to the drive motor, and is used to obtain the current size of the drive motor when it is running and send the obtained data to the controller; the torque sensor is set in a one-to-one correspondence with the drive motor and is connected to the drive motor, and is used to obtain the output torque of the drive end of the drive motor and send the obtained data to the controller; When the controller receives the operating current or output torque of the drive motor that is greater than the set value, the controller will issue an alarm and turn off the drive motor.

2. The bridge type sand suction machine fault warning device according to claim 1 is characterized in that: When the controller receives that the operating current or output torque of the drive motor continues to increase but is less than the set value, the controller will issue an alarm signal.

3. The bridge type sand suction machine fault warning device according to claim 1 is characterized in that: It also includes two wheel speed meters (6), which are installed on the wheel and are used to obtain the rotation speed of the wheel when it rotates; the wheel speed meters are connected to the controller and send the obtained data to the controller; When the controller detects that the speeds of the two wheel tachometers are different and the speed difference between the two wheels is greater than the set value, the controller turns off the drive motor and sends an alarm signal.

4. The bridge type sand suction machine fault warning device according to claim 3 is characterized in that: When the controller detects that the rotation speeds of the two runner speed meters are different and the rotation speed difference between the two runners is less than the set value, the controller will issue an alarm signal.

5. The bridge type sand suction machine fault warning device according to claim 3 is characterized in that: A level meter (5) is also provided on the truss, and the level meter is connected to the controller circuit. The level meter is used to detect whether the truss is in a horizontal state and send a state signal of the truss to the controller; When the controller detects that the truss is in a non-horizontal state, the controller turns off the drive motor and sends out an alarm signal.

6. A bridge-type sand suction machine fault warning system in an underground sewage treatment system, characterized in that: An early warning system for the early warning device according to any of claims 1 to 5, comprising a data acquisition module, a data processing module and an alarm module; Among them, the data acquisition module is used to obtain the data monitored by the level meter, speedometer, current sensor and torque sensor, and send the acquired data to the data processing module; the data processing module is used to compare the monitoring data with the set value. When the monitoring data is different from the set value or is not within the set numerical range, the received monitoring data will be displayed on the display screen, the drive motor will be turned off, and a signal will be sent to the alarm module; the alarm module is used to issue an alarm signal after receiving the signal from the data processing module.

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