Safety control device and method for maintenance of shield machine slurry box

Abstract

The present invention relates to a safety control device and method for the maintenance of a slurry box of a shield machine. An isolating switch is added between a stirring motor and a contactor to disconnect the stirring motor from the contactor when the shield machine is shut down for maintenance or when manual cleaning of slurry in the slurry box is performed, so as to prevent personal injury to maintenance personnel due to local misoperation by a third person or remote misstart of an operation interface. An infrared sensor is added in the slurry box. When the inspection port is opened and personnel enter the slurry box to work, the PLC receives a signal from the infrared sensor and locks a button on the slurry box stirring operation interface to prevent personal injury to maintenance personnel due to misstart of the stirring motor. A limit device is added to the slurry box. The limit device passes through a rotating mechanism inspection port. When the inspection port is opened, the rotating mechanism works, the limit switch transmits a signal to the PLC, and the PLC locks a button on the slurry box stirring operation interface to prevent personal injury to maintenance personnel due to misstart of the stirring motor.

Description

Technical Field

[0001] The present invention relates to a safety control device and method for shield machine slurry box maintenance, and in particular to a safety assurance method to prevent personal injury or death of maintenance personnel due to remote or local misoperation by a third party. At the same time, the device and control method are applicable to most slurry box mixing equipment. Background Art

[0002] During normal tunneling construction of the shield machine, the slurry in the slurry box on the trolley is the guarantee for filling the gap between the pipe segments and the soil layer during the tunneling process, ensuring that the ground settlement is controlled within the allowable design range. The slurry ratio in the slurry box changes with the change of soil quality.

[0003] When the shield machine is shut down for maintenance, the slurry in the slurry box is not completely used up, or the slurry box mixer fails due to slurry ratio problems, and manual entry into the slurry box is required to clean the debris and perform maintenance work. At this time, in order to prevent a third person from mistakenly starting the slurry box mixing action in the local control cabinet or remote operation room platform, causing personal injury or death accidents to maintenance personnel, the previous routine was for operators to communicate and handle matters through walkie-talkies. Human inattention or carelessness may cause irreversible safety accidents.

[0004] Therefore, a control device and control method are needed to add an isolating switch between the shield machine's slurry box stirring motor and the contactor to ensure safety. The isolating switch only works when the slurry box stirring is under maintenance to ensure that personal injury to maintenance personnel will not be caused by a third party's misoperation of the contactor or the remote operation interface. Summary of the invention

[0005] The present invention proposes a safety control device and method for the maintenance of a shield machine slurry box. The control method is a safety guarantee method to prevent personal injury or death of maintenance personnel due to remote or local misoperation by a third party. At the same time, the control method is applicable to most slurry box mixing equipment. The use of the control device and method can effectively eliminate the safety hazards in the background data and realize safe and efficient maintenance in a truly sense.

[0006] To achieve the above-mentioned purpose, the technical solution of the present invention is: a safety control device for the maintenance of a shield machine slurry box, comprising a stirring motor, a contactor, a rotating mechanism, an inspection port, a power switch, a PLC and an operation interface in the slurry box, an isolating switch is added between the stirring motor and the contactor, which is used to disconnect the connection between the stirring motor and the contactor when the shield machine is shut down for maintenance or the slurry in the slurry box is manually entered for cleaning, so as to prevent local misoperation by a third party or remote misstart of the operation interface from causing personal injury to maintenance personnel; an infrared sensor is added to the slurry box, and when the inspection port is opened and personnel enter the slurry box to work, the PLC receives the signal of the infrared sensor and locks the slurry box stirring operation interface button to prevent the stirring motor from misstarting and causing personal injury to maintenance personnel; a limit device is added to the slurry box, and the limit device passes through the inspection port of the rotating mechanism. When the inspection port is opened, the rotating mechanism works, the limit switch transmits a signal to the PLC, and the PLC locks the slurry box stirring operation interface button to prevent the stirring motor from misstarting and causing personal injury to maintenance personnel.

[0007] Furthermore, the limit device adopts a limit switch, and the rotating mechanism is connected to the PLC via the limit switch.

[0008] A safety control method for shield machine slurry box maintenance, using a safety control device for shield machine slurry box maintenance, comprising:

[0009] (1) When the shield machine slurry box needs to be repaired, the power switch must be turned off, the isolation switch must be turned on, and the PLC must check whether the motor is started. If the motor is not started, the maintenance staff must enter the slurry box to clean the slag; if the motor is started, the maintenance staff must not enter;

[0010] (2) When the slurry box of the shield machine needs to be repaired, the power switch must be turned off, the inspection port must be opened, the infrared sensor starts working, and the signal is transmitted to the PLC. The buttons on the mixing start and close operation interface are locked normally. The PLC checks whether the motor will start. If the motor does not start, the maintenance staff will enter the slurry box to clean the slag; when the motor starts, the maintenance staff are prohibited from entering;

[0011] (3) When the slurry box of the shield machine needs to be repaired, the power supply must be disconnected, the inspection port must be opened, the rotating mechanism must rotate, the limit switch must transmit a signal to the PLC, the buttons on the mixing start and close operation interface must be locked normally, and the PLC must check whether the motor will start. If the motor does not start, the maintenance staff must enter the slurry box to clean the slag; if the motor starts, maintenance is prohibited.

[0012] The beneficial effects of the present invention are:

[0013] 1. The present invention adds an isolator safety device between the motor and the release device to ensure the personal safety of maintenance workers.

[0014] 2. The present invention utilizes infrared sensors to work. When personnel enter, the PLC program receives signals and the buttons on the operation interface are locked to ensure that the stirring motor cannot be started, thereby ensuring the personal safety of maintenance personnel.

[0015] 3. The present invention utilizes a limit device. When a person enters, the rotating mechanism works, the limit switch signal is transmitted to the PLC program, and the buttons on the operation interface are locked to ensure that the stirring motor cannot be started, thereby ensuring the personal safety of the maintenance personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the newly added isolator between the stirring motor and the contactor;

[0017] Figure 2 It is a schematic diagram of adding an infrared sensor safety device in the pulp box;

[0018] Figure 3 This is a schematic diagram of a limit switch safety device added to the pulp box;

[0019] Figure 4 This is a schematic diagram of the slurry box stirring start and close procedure when the isolator is working;

[0020] Figure 5 This is a schematic diagram of the pulp box stirring start and close procedure when the infrared sensor is working;

[0021] Figure 6 It is a schematic diagram of the pulp box stirring start and close procedure when the limit device is working. DETAILED DESCRIPTION

[0022] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0023] The safety control device for the maintenance of the slurry box of the shield machine of the present invention adds an isolating switch 2 between the stirring motor and the contactor in the slurry box 1. Figure 1 This isolating switch 2 only works when the shield machine is shut down for maintenance or when the slurry in the slurry box needs to be cleaned manually, ensuring that no personal injury to maintenance personnel will occur due to local misoperation by a third party or remote misstart of the operation interface. An infrared sensor 3 is added in the slurry box, such as Figure 2 When the inspection port 4 is opened and personnel enter the pulp box to work, the PLC receives the signal from the infrared sensor 3 and the buttons on the pulp box stirring operation interface are locked to ensure that the maintenance personnel will not be injured due to the accidental start of the stirring motor. A limit device is added to the pulp box, such as Figure 3 As shown, when the inspection port is opened, the rotating mechanism 6 works, the limit switch 5 transmits a signal to the PLC, and the buttons on the slurry box stirring operation interface are locked to ensure that the maintenance personnel will not be injured due to the accidental start-up of the stirring motor.

[0024] When the maintenance work is finished, the power is turned on and the slurry box stirring start control resumes normal operation. The following is an introduction to its working procedures.

[0025] (1) When the shield machine slurry box needs to be repaired, the power supply must be disconnected, the isolation switch must be turned on, the PLC must be tested, and the motor must be checked to see if it is started. If the motor is not started, the maintenance staff must enter the slurry box to clean the slag. If the motor is started, the maintenance staff must not enter. Figure 4 shown.

[0026] (2) When the shield machine slurry box needs to be repaired, the power supply must be disconnected, the inspection port must be opened, the infrared sensor starts working, and the signal is transmitted to the PLC program. The buttons on the mixing start and close operation interface are locked normally. Check whether the motor will start. If the motor does not start, the maintenance staff will enter the slurry box to clean the slag. If the motor starts, the maintenance staff is prohibited from entering. Figure 5 shown.

[0027] (3) When the shield machine slurry box needs to be repaired, the power supply must be disconnected, the inspection port must be opened, the rotating mechanism must rotate, the limit switch must transmit a signal to the PLC program, the buttons on the mixing start and close operation interface must be locked normally, and the motor must be checked to see if it will start. If the motor does not start, the maintenance staff must enter the slurry box to clean the slag. If the motor starts, maintenance is prohibited. Figure 6 shown.

Claims

1. A safety control device for the maintenance of a slurry box of a shield machine, comprising a stirring motor, a contactor, a rotating mechanism, an inspection port, a power switch, a PLC and an operation interface in the slurry box, characterized in that: An isolating switch is added between the stirring motor and the contactor to disconnect the stirring motor from the contactor when the shield machine is shut down for maintenance or the slurry in the slurry box is manually cleaned, so as to prevent local misoperation by a third party or remote misstart of the operation interface from causing personal injury to maintenance personnel; an infrared sensor is added in the slurry box. When the inspection port is opened and personnel enter the slurry box to work, the PLC receives the signal from the infrared sensor and locks the buttons on the slurry box stirring operation interface to prevent the stirring motor from being misstarted and causing personal injury to maintenance personnel; a limit device is added to the slurry box, and the limit device is connected to the inspection port through a rotating mechanism. When the inspection port is opened, the rotating mechanism works, and the limit switch transmits a signal to the PLC, which locks the buttons on the slurry box stirring operation interface to prevent the stirring motor from being misstarted and causing personal injury to maintenance personnel; the limit device adopts a limit switch, and the rotating mechanism is connected to the PLC through the limit switch.

2. A safety control method for shield machine slurry box maintenance, using the safety control device for shield machine slurry box maintenance according to claim 1, characterized in that: include: (1) When the slurry box of the shield machine needs to be repaired, the power switch must be turned off, the isolation switch must be turned on, and the PLC must check whether the motor is started. If the motor is not started, the maintenance staff must enter the slurry box to clean the slag; The motor is started and maintenance personnel are prohibited from entering; (2) When the slurry box of the shield machine needs to be repaired, the power switch needs to be turned off, the inspection port needs to be opened, the infrared sensor starts working, transmits the signal to the PLC, the buttons on the mixing start and close operation interface are locked normally, and the PLC checks whether the motor will start. If the motor does not start, the maintenance staff enters the slurry box to clean the slag; The motor is started and maintenance personnel are prohibited from entering; (3) When the slurry box of the shield machine needs to be repaired, the power supply needs to be disconnected, the inspection port needs to be opened, the rotating mechanism needs to rotate, the limit switch needs to transmit a signal to the PLC, the buttons on the mixing start and close operation interface need to be locked normally, and the PLC needs to check whether the motor will start. If the motor does not start, the maintenance staff needs to enter the slurry box to clean the slag; The motor is started and maintenance is prohibited.

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