Manhole cover plate fence linkage protection device and method with safety monitoring function

Abstract

The invention discloses a manhole cover plate fence linkage protection device and method with a safety monitoring function, and belongs to the technical field of limited space operation safety protection. Comprising a device basic component, a fence, a locking mechanism, a linkage mechanism, a cover plate and a monitoring system. The device foundation component is mounted on the inner wall of the orifice; the fence is arranged in the device basic component and can ascend and descend. The fence is composed of a fan blade fence and a fence door. The locking mechanism is installed on the device foundation component and the fence and used for effectively locking the fence under the full-open-position isolation working condition. The linkage mechanism is connected with the fence and the cover plate. The monitoring system comprises a fence position detection device and a detector. Linkage of a manhole opening protection facility and safety monitoring is achieved, and the safety of limited space operation is effectively improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of manhole safety isolation protection, and particularly relates to a manhole cover fence linkage protection device and method with safety monitoring. BACKGROUND

[0002] In the operation of a power plant, many works need to pass in and out of a manhole. Generally, a manhole cover is installed at the manhole part of the equipment, and when the personnel need to pass in and out of the manhole, the manhole cover needs to be opened, and a safety isolation fence needs to be erected at the manhole to ensure the safety of the personnel working in the manhole area.

[0003] Each link in the working process of the personnel (personnel operation safety at the manhole part, personnel passing and working safety in the manhole) needs to adhere to the safety of the personnel as the professional bottom line. At present, according to the existing technology, there are cover and fence linkage and other technical solutions. According to the field application, the existing technology realizes the linkage operation of the cover and the fence device, simplifies the field operation mode, and ensures the safety of the operators. However, the prediction of the dangerous conditions of the personnel passing and working in the manhole is not effectively closed-loop controlled and managed. Generally, such working conditions may involve limited space operation, which is very dangerous for the operators. In the field working conditions, the opened cover has the risk of misentry of the operators. If there are toxic and harmful substances in the manhole, it will cause irreparable accidents to the operators. How to ensure the safety of the personnel passing and working in the manhole is a problem that needs to be solved by the operators. SUMMARY

[0004] The technical problem to be solved by the present application is to provide a manhole cover fence linkage protection device and method with safety monitoring, which realizes the safety protection of the manhole area and the locking of the dangerous conditions in the manhole, and effectively protects the life safety of the personnel at the manhole part and in the manhole.

[0005] To solve the above technical problems, the technical solution adopted by the present application is: A manhole cover fence linkage protection device with safety monitoring, comprising a device base member, a fence, a locking mechanism, a linkage mechanism, a cover, and a monitoring system. The device base member is installed on the inner wall of the manhole. The fence is installed in the device base member and can be lifted. The locking mechanism is installed on the device base member and the fence, and is used for effectively locking the fence in the fully open position isolation working condition. The linkage mechanism is connected with the fence and the cover. The monitoring system comprises a fence position detection device, a detector, an audible and light alarm, a door lock actuator and a control module; the fence position detection device is installed on the locking mechanism, the detector is installed at the bottom of the limited space, and the control module is installed at the gap position of the device base member; the fence position detection device and the detector are connected to the control module through output signals; when the fence position detection device detects that the locking mechanism is not in place when the sector fence or the fence door is in the fully open state, the output signal is sent to the control module, the control module transmits an execution signal to the audible and light alarm to generate an alarm; when the detector detects an environmental danger, the output signal is sent to the control module, and the control module transmits an execution signal to the audible and light alarm to generate an alarm or the door lock actuator performs a door locking operation.

[0006] Preferably, the device base member comprises an upper support, a lower support and a fastener; the upper support is installed on the aperture base through the fastener, and the lower support is installed on the mounting plate connected with the upper support.

[0007] Preferably, the upper support body section is in the shape of Z; the upper lap edge of the upper support is provided with a mounting hole; The lower support table of the upper support is provided with a fence vertical rod first avoiding hole, a limiting boss is arranged beside the fence vertical rod first avoiding hole, a skirting board lever avoiding hole is arranged in the middle part of the limiting boss and close to the wall body direction; the lower support table is respectively provided with a skirting board first limiting hole, and the lower support table on the side where the fence door is installed is provided with a fence door up-down sliding first avoiding slot; The upper support is provided with a support beam, a support inclined rod and a fixed hinge seat at the corresponding positions of the cover plate.

[0008] Preferably, the lower support is located below the upper support, and the lower support body section is in the shape of L; the lower support table edge of the lower support is provided with a fence vertical rod second avoiding hole, a skirting board lever avoiding hole is arranged in the middle part of the fence vertical rod second avoiding hole and close to the wall body direction; the lower support table edges of the lower support are respectively provided with a skirting board second limiting hole, and the lower support table on the side where the fence door is installed is provided with a fence door up-down sliding second avoiding slot; a locking hook is installed at the lower part of the lower support, and the locking hook is installed with a fence position detection device.

[0009] Preferably, the fastener comprises a chemical thread sleeve and a fastening bolt; the chemical thread sleeve is provided with threads inside and outside, which are internal threads and external threads respectively, and an inner hexagonal hole is arranged at the upper end of the internal threads, so that the external threads are installed on the aperture base in cooperation with the chemical agent, and the internal threads are matched with the fastening bolt; the fastening bolt passes through the mounting hole of the upper support to fix the upper support on the aperture base.

[0010] Preferably, the fence comprises a sector fence and a fence door. The fan-shaped fence comprises an upper horizontal plate, a fence locking vertical rod, a fence vertical rod, a lower horizontal connecting plate and a handle; the fence locking vertical rod and the fence vertical rod are connected between the upper horizontal plate and the lower horizontal connecting plate, and the upper horizontal plate is provided with the handle; The upper horizontal plate is provided with a welding avoidance hole and a handle installation rectangular avoidance hole; The fence locking vertical rod is provided with an avoidance slot, a U-shaped unlocking plate avoidance slot and a lower horizontal connecting plate installation hole and is connected with the lower horizontal connecting plate; The upper end of the fence vertical rod is provided with a hollow functional slot, and the lower end is provided with an installation hole and is connected with the lower horizontal connecting plate; The handle is installed in the handle installation rectangular avoidance hole through a pin shaft.

[0011] Preferably, the fence door comprises a frame body and a movable door; the movable door is installed on the fence locking vertical rod and can rotate around the fence locking vertical rod to realize opening and closing operation; The fence door is provided with a movable door end locking and a movable door middle locking, which are used for locking in the closed state to prevent the movable door from being misoperated; The movable door end locking is installed on the movable door reinforcing rib plate and can be inserted into the fence door frame reinforcing rib plate to limit rotation connection; the movable door reinforcing rib plate is connected with a fence door middle vertical rod, and the fence door middle vertical rod is provided with the movable door middle locking; the movable door middle locking can be inserted into the fence door frame middle vertical rod of the frame body to limit rotation connection by moving up and down; and the movable door upper horizontal plate is rotatably connected with the end upper horizontal plate.

[0012] Preferably, the movable door end locking comprises a locking rod, a release locking limiting rod and an automatic locking spring; the locking rod is used for adapting to the stepped locking hole of the fence door frame reinforcing rib plate; the automatic locking spring is sleeved on the locking rod; the release locking limiting rod is installed on the locking rod and is located above the automatic locking spring; the locking rod is movably installed on the movable door reinforcing rib plate; and the release locking limiting rod avoids downward movement of the locking rod after rotation.

[0013] Preferably, the locking mechanism comprises an unlocking connecting rod, a handle, an unlocking plate, a lock tongue mechanism support, a lock tongue mechanism and a locking hook; The unlocking connecting rod is installed in the fence locking vertical rod and can move up and down; The handle is installed on the upper end of the unlocking connecting rod and can move up and down in the up-and-down movement avoidance slot of the fence locking vertical rod, and is used for linkage up-and-down operation on the unlocking plate; The upward operation of the unlocking plate realizes retraction movement of the lock tongue mechanism.

[0014] Preferably, the latch mechanism comprises a housing, a latch, a self-holding spring and a driving rod; the latch and the self-holding spring are installed in the housing, the self-holding spring is installed on a spring positioning rod and is sleeved into a latch spring installation hole; the self-holding spring can keep the latch in a fully extended state, and the latch is synchronously pressed when the latch is pressed; the latch is provided with a sliding rod which is matched with a sliding groove provided on the driving rod, and upward movement of the driving rod drives the latch to move back; The driving rod is driven to move by the unlocking plate; The latch mechanism is installed on the lower horizontal connecting plate through a latch mechanism support, the locking hook is installed below the lower support, and effective lapping of the latch mechanism and the locking hook realizes effective support of the fence.

[0015] Preferably, the toe-kick mechanism is installed in the upper support and is taken out of the hole when the fence is lifted to the end position and is kept in the hole; The toe-kick mechanism comprises a lever, a toe-kick and a limiting nut; The lever is installed on the fence with a latch vertical rod and a fence vertical rod; the toe-kick is provided with a folded edge which is matched with the lever and receives the lifting force of the lever; the toe-kick is provided with a limiting rod which passes through a toe-kick first limiting hole of the upper support and a toe-kick lever second avoiding hole of the lower support and is matched with the limiting nut.

[0016] Preferably, the linkage mechanism comprises a driving ring, a sliding support hinge, a support beam, a support inclined rod and a fixed hinge base; The support inclined rod is connected with the fixed hinge base through a pin shaft; the support inclined rod is connected with the support beam through a pin shaft; a cover plate is installed on the support beam; The driving ring is installed on the fence with a latch vertical rod and a fence vertical rod; the driving ring comprises a fixed ring and an adjusting ring which are connected through internal threads and external threads of the fixed ring; the adjusting ring is used for fine adjustment of the holding angle of the cover plate in a fully open state; The sliding support hinge comprises an avoiding sliding support hinge and a straight-through sliding support hinge; The avoiding sliding support hinge is provided with an avoiding space for avoiding interference with an operation handle of the fence; the avoiding sliding support hinge is provided with a first through hole which is installed on the fence with a latch vertical rod and can slide up and down; the avoiding sliding support hinge is provided with a first connecting pin shaft hole at an upper end thereof and a first support beam avoiding groove; The straight-through sliding support hinge is provided with a second through hole for installation on the fence vertical rod and can slide up and down; the straight-through sliding support hinge is provided with a second connecting pin shaft hole at a front upper end thereof and a second support beam avoiding groove; The sliding support hinge is connected with the support beam through a pin shaft, the sliding support hinge is driven to move up and down by the driving ring, the support beam is driven to move up and down and turn over, and the effective opening and closing function of the cover plate is realized.

[0017] Preferably, the supporting beam is a square profile, with a first pin mounting hole at one end for connecting the sliding support hinge, and a second pin mounting hole at the other end for connecting the supporting diagonal rod; the reciprocating linear motion of the sliding support hinge is converted into the up-and-down opening and closing motion of the supporting beam, thereby driving the supporting diagonal rod to achieve effective opening and closing of the cover plate; The lower end of the support diagonal bar is provided with a third pin mounting hole for connecting and fixing the hinge seat, and the upper end is provided with a fourth pin mounting hole and a rotation transfer groove for connecting the second pin mounting hole of the support beam. The fixed hinge includes a mounting plate, a connecting hole, and a hinge groove. The hinge groove is set at an angle θ, which is the swing angle θ of the support diagonal rod when the cover plate is fully open to fully closed. The mounting plate is mounted on the bracket, and the connecting hole is set on the hinge groove.

[0018] Preferably, the cover plate is a square cover plate, which includes a half cover plate and a quarter cover plate; the half cover plate and the quarter cover plate together form a whole square cover plate. The linkage mechanism that drives the movement of the half-cover plate and the quarter-cover plate has the same structure; The cover plate is installed on the upper surface of the support beam, and a reinforcing rib is provided between the cover plate and the support beam.

[0019] Preferably, the audible and visual alarm includes a dedicated sleeve, a tail cap, a lamp tube, a sound-generating component, a lamp cover, and a controllable battery; The special tube sleeve has a tail cap at the bottom and a lamp cover at the top. A sound-generating component is located below the lamp cover. A window is opened on the outer wall of the special tube sleeve, and a lamp tube is located inside the window. A controllable battery is used to power the lamp tube and the sound-generating component.

[0020] Preferably, the device further includes a door lock actuator, which includes an up-and-down telescopic piston locking rod, an up-and-down telescopic cylinder, a forward-and-backward moving piston rod, a forward-and-backward moving lever seat, and a base; The base is installed on the upper bracket, aligned with the locking position at the end of the movable door. One end of the forward and backward moving piston rod is installed on the upper bracket, and the other end is installed on the forward and backward moving lever seat. The forward and backward moving lever seat is connected to the upper and lower telescopic cylinders by welding. The forward and backward moving lever seat can slide on the base of the door lock actuator, and the upper and lower telescopic piston locking rod can freely extend and retract in the upper and lower telescopic cylinders.

[0021] Preferably, the device further includes an external driving force mechanism, which is a hydraulic drive mechanism or an electric motor drive mechanism, and the external driving force mechanism is connected to the fan-shaped fence.

[0022] Preferably, the control module is designed in an integrated manner and installed on the base structure of the device; the audible and visual alarm is installed on the fence, and the door lock actuator is installed on the base structure of the device and receives signals from the control module to execute the locking or unlocking action of the fence door.

[0023] An operating method of a manhole cover fence linkage protection device with safety monitoring, comprising the following steps: S1, installing the manhole cover fence linkage protection device with safety monitoring on the target manhole position; S2, lifting the fence door to the fully open position by the hidden handle on the fence door; during the lifting process, the kick plate is moved out and supported at the manhole position by the kick plate driven by the lever on the fence door; the locking mechanism automatically operates, the locking tongue mechanism cooperates with the locking hook on the lower support to lock the fence door at the fully open position, and the fence position detection device on the locking hook is triggered synchronously; S3, lifting the sector fence to the fully open position one by one by the hidden handle on the sector fence; during the lifting process, the sector fence drives the linkage mechanism to move, and the linkage mechanism further drives the cover plate to open synchronously; at the same time, the kick plate is moved out and supported at the manhole position by the kick plate driven by the lever on the sector fence; the locking mechanism automatically operates, the locking tongue mechanism cooperates with the locking hook on the lower support to lock the sector fence at the fully open position, and the fence position detection device on the locking hook is triggered synchronously; S4, when all the fence position detection devices are triggered, the power supply system of the control module is powered on, and the control module starts to operate; the detector collects the environmental parameters in the manhole in real time and transmits them to the control module, the control module logically judges the parameters, sends signals to the corresponding actuator according to the judgment result, and the actuator executes the corresponding action after receiving the signals; the judgment result includes that the toxic and harmful gas exceeds the standard, the humidity / temperature / liquid level exceeds the standard, the actuator includes the audible and visual alarm and the door lock actuator; S5, manually pulling the locking rod of the movable door end to rotate it by 90°, and then placing the unlocking limiting rod on the upper surface of the movable door reinforcing rib plate to keep the movable door end locking in the unlocked state; then manually operating the movable door middle locking installed in the fence door middle stand to release the limiting relationship between the movable door and the fence door frame body; finally, rotating the movable door around the fence lock stand to completely open the movable door for personnel to pass through the manhole; at this time, the fence door is opened; S6, when the personnel enter the hole or the hole operation is suspended, the rotating door around the fence with lock vertical rod is rotated and closed to the fence door frame body; the locking of the movable door is manually operated, so that the movable door and the fence door frame body are fixed; the locking rod at the end of the movable door is manually operated, and the self-holding state of the locking rod is released by reversing rotation (90) °. Under the elastic force of the automatic locking spring, the locking rod is inserted into the stepped locking hole of the fence door frame reinforcing rib plate, so that the movable door and the fence door frame body form an integral structure; at this time, the fence door is closed; S7, when the hole operation is completed, the fan-shaped fence is closed, and the handle of the locking mechanism is operated with both hands. The handle moves upward along the avoiding slot of the fence with lock vertical rod, and drives the unlocking link and the unlocking plate to move upward synchronously. The unlocking plate pushes the driving rod of the lock tongue mechanism, so that the lock tongue compresses the self-holding spring and retracts into the shell. The cooperation between the lock tongue and the locking hook is released, and the locking of the fan-shaped fence is released. The fan-shaped fence moves downward under the action of gravity, and simultaneously drives the linkage mechanism, the cover plate and the kick plate to move downward synchronously under the action of gravity. When the fan-shaped fence moves to the end position of the device, the fan-shaped fence is slowly lowered through the handle until it completely enters the inside of the device, and the fan-shaped fence is completely closed; S8, the fence door is closed, and the handle of the locking mechanism is operated with both hands. The handle moves upward along the avoiding slot of the fence with lock vertical rod, and drives the unlocking link and the unlocking plate to move upward synchronously. The unlocking plate pushes the driving rod of the lock tongue mechanism, so that the lock tongue compresses the self-holding spring and retracts into the shell. The cooperation between the lock tongue and the locking hook is released, and the locking of the fence door is released. The fence door moves downward under the action of gravity, and simultaneously the kick plate moves downward synchronously under the action of gravity. When the fence door moves to the end position of the device, the fence door is slowly lowered through the handle until it completely enters the inside of the device, and the device is completely closed; S9, after the fence is completely closed, it is disengaged from the locking hook, and the fence position detection device is no longer triggered. The power supply system of the control module loses power, and the whole monitoring system stops running.

[0024] Preferably, S4 substep is: S4.1 environmental safety judgment and action: if the detector detects that there is no toxic and harmful gas in the hole, the humidity is suitable, the temperature is comfortable, and the liquid level is normal, the control module determines that the environment is safe, and does not send action signal to the sound and light alarm and the door lock actuator; At this time, the sound and light alarm does not alarm, the door lock actuator does not act, and the personnel can directly enter the subsequent fence door opening step; S4.2 Toxic and harmful gas over-standard determination and action: if the detector detects that there are toxic and harmful gases such as methane, carbon monoxide, hydrogen sulfide, ammonia, hydrocarbons, nitrogen oxides, etc. in the hole, and the concentration exceeds the safety threshold, the control module determines that the environment is unsafe, sends an alarm signal to the sound-light alarm and a locking signal to the door lock actuator; the sound-light alarm sends a sound-light alarm prompt after receiving the signal, and the door lock actuator executes the door locking operation after receiving the signal, preventing the active door from being opened; at this time, the process of "ventilation first, detection second, and operation third" needs to be performed, and after ventilation, the detector re-detects that the environmental parameters are qualified, the control module cancels the alarm signal and the door locking signal, and then the subsequent fence door opening step can be entered; S4.3 Humidity / temperature / liquid level over-standard determination and action: if the detector only detects that the hole is greater than the threshold, the temperature exceeds the threshold range, or the liquid level exceeds the normal range, and no toxic and harmful gas over-standard is detected, the control module determines that the environment has non-fatal risks, and only sends an alarm signal to the sound-light alarm; the sound-light alarm sends a sound-light prompt after receiving the signal, and the door lock actuator does not act, so personnel can still enter the subsequent fence door opening step.

[0025] The present application can achieve the following beneficial effects: 1. The device is installed on the inner wall of the hole opening, and no space step is needed to realize the unlocking function. The locking and unlocking device of the existing device is arranged on the device body, which realizes the effect that the upper surface of the device is flush with the base surface of the hole opening, ensures the flatness of the area after installation, and does not affect the passage and other maintenance operations of the hole platform part. At the same time, the device can automatically detect the working environment (temperature, humidity, toxic and harmful substances, etc.) in the hole opening after being opened, and when the detection result is over-standard and dangerous, the fence system of the device cannot be opened, and the workers are prompted by the sound-light alarm device that the hole is dangerous. Only in the case that the working environment is safe and suitable, the fence system of the device can be opened, ensuring the safe construction of such workers.

[0026] 2. The linkage mechanism forms a linkage relationship between the fence and the cover plate, and the cover plate can be opened and closed synchronously during the lifting of the fence, without the need for separate operation of the cover plate, which simplifies the operation process of the manhole opening and closing, and improves the operation efficiency. At the same time, the linkage of the fence and the cover plate ensures that the manhole can quickly form effective protection in different states (opening operation / closed protection), and the response is more timely.

[0027] 3、The device is an intrinsically safe product. When the device is opened, the operator first opens the fence door, at this time the cover plate is not opened, then the sector fence is opened, the fence is preferentially built, and the cover plate is opened at the end of the operation, realizing the operation mode of building the fence first and then opening the cover plate in the opening operation of the orifice part of the device, avoiding the risk of falling of the operator during the edge operation; when the device is closed, the operator first closes the sector fence, the process preferentially closes the cover plate, then closes the sector fence, at this time the cover plate is fully closed, and then the fence door is closed, realizing the operation mode of closing the cover plate first and then closing the fence in the closing operation of the orifice part of the device, avoiding the risk of falling of the operator during the edge operation.

[0028] 4、The monitoring system integrates the fence position detection device and the dangerous environment detector, which can monitor the fence in place and the concentration of dangerous gas in the limited space in real time. When the fence is not in place, the audible and visual alarm automatically alarms to remind the standard operation; when the dangerous gas exceeds the standard, not only the audible and visual alarm is triggered, but also the fence door is automatically locked by the door lock actuator, which technically prevents personnel from entering the dangerous environment and greatly reduces the safety risk of limited space operation, effectively ensuring the safety of the operator.

[0029] 5、The upper support of the device base component adopts Z-shaped section, the lower support adopts L-shaped section, and the fastener connection mode of chemical thread sleeve and fastening bolt can be stably installed on the orifice foundation, ensuring the overall structural strength and installation reliability of the device; the fine design of components such as locking mechanism and kick plate mechanism (such as the self-holding spring of the lock tongue mechanism, the push rod and the folding edge cooperation structure of the kick plate) makes the operation of each mechanism smooth, the locking and supporting effect stable, and the durability and stability of the device during long-term use improved.

[0030] 6、The design of the fence position detection device "triggered power supply" only supplies power to the monitoring system when the fence is fully in place (the device is in working condition), effectively avoiding power consumption during non-operation period, realizing energy saving; at the same time, the device can adapt to limited space orifices of different sizes, and can also integrate external driving force mechanisms such as hydraulic driving mechanism or motor driving mechanism according to demand, having good scene applicability and functional expandability. BRIEF DESCRIPTION OF DRAWINGS

[0031] The application will be further described below in combination with the drawings and examples: Figure 1 It is a three-dimensional structure diagram of the manhole cover plate fence linkage protection device (device full-closed state); Figure 2 It is a three-dimensional structure diagram of the manhole cover plate fence linkage protection device (device isolation state); Figure 3 It is a three-dimensional structure diagram of the manhole cover plate fence linkage protection device (fence door open state); Figure 4Figure 6 is a structure diagram of the fence and the cover plate and linkage mechanism connection structure; Figure 5 Figure 7 is a structure diagram of the door lock actuator installation structure of the present application; Figure 6 Figure 8 is a structure diagram of the present application; Figure 5 Figure 9 is an enlarged view of B in Figure 8; Figure 7 Figure 10 is a structure diagram of the upper support; Figure 8 Figure 11 is a structure diagram of the lower support; Figure 9 Figure 12 is a structure diagram of the fastener installing the upper support; Figure 10 Figure 13 is a structure diagram of the fastener; Figure 11 Figure 14 is a structure diagram of the fan-shaped fence; Figure 12 Figure 15 is an expanded structure diagram of the fan-shaped fence; Figure 13 Figure 16 is a structure diagram of the fence door (door open state); Figure 14 Figure 17 is a structure diagram of the fence door (door closed state); Figure 15 Figure 18 is a structure diagram of the present application; Figure 14 Figure 19 is an enlarged view of A in Figure 18; Figure 16 Figure 20 is a structure diagram of the locking mechanism; Figure 17 Figure 21 is a structure diagram of the bolt mechanism; Figure 18 Figure 22 is an expanded diagram of the bolt mechanism; Figure 19 Figure 23 is a structure diagram of the support beam; Figure 20 Figure 24 is a structure diagram of the support inclined rod; Figure 21 Figure 25 is a structure diagram of the fixed hinge seat; Figure 22 Figure 26 is a structure diagram of the avoiding sliding support hinge; Figure 23 Figure 27 is a structure diagram of the straight-through sliding support hinge; Figure 24 Figure 28 is an expanded diagram of the driving ring; Figure 25 Figure 29 is a structure diagram of the kick plate; Figure 26 Figure 30 is a structure diagram of the kick plate mechanism; Figure 27 Figure 31 is an expanded diagram of the sound-light alarm; Figure 28 Figure 32 is an appearance diagram of the sound-light alarm; Figure 29 Figure 33 is a structure diagram of the door lock actuator; Figure 30 Figure 34 is a structure diagram of the cover plate; Figure 31 Control logic diagram for the present method.

[0032] In the figure: 0-Orifice foundation; 1-Upper support; 1-1-Upper support mounting hole; 1-2-First fence upright avoidance hole; 1-3-Sliding support hinge limit boss; 1-4-Toe kick plate first limit hole; 1-5-Toe kick plate lever first avoidance hole; 1-6-Fence door up and down sliding first avoidance slot; 2-Lower support; 2-1-Second fence upright avoidance hole; 2-2-Toe kick plate lever second avoidance hole; 2-3-Toe kick plate second limit hole; 2-4-Fence door up and down sliding second avoidance slot; 3-Fastener; 30-Chemical thread sleeve; 30-1-Chemical thread sleeve inner hexagonal hole; 30-2-Chemical thread sleeve internal thread; 30-3-Chemical thread sleeve external thread; 31-Fastening bolt; 4-Fan fence; 41-Upper horizontal cross plate; 41-1-Mounting and welding avoidance hole; 41-2-Handle mounting rectangular avoidance hole; 42-Fence with lock upright; 42-1-Unlocked connecting rod up and down movement avoidance slot; 42-2-U-shaped unlocking plate avoidance slot; 42-3-Lower horizontal connecting plate mounting hole; 43-Fence upright; 43-1-Fence upright hollow function slot; 43-2-Fence upright mounting hole; 44-Lower horizontal connecting plate; 45-Handle; 5-Locking mechanism; 50-Unlocked connecting rod; 51-Handle; 52-Unlocking plate; 53-Latch mechanism support; 54-Latch mechanism; 54-1-Latch mechanism shell; 54-1-1-Spring positioning rod; 54-2-Latch; 54-2-1-Latch spring mounting hole; 54-2-2-Latch sliding rod; 54-3-Self-holding spring; 54-4-Latch driving rod; 54-4-1-Driving rod sliding groove; 55-Locking hook; 140-Fence position detection device; 6-Fence door; 6-A-Frame body; 6-B-Movable door; 61-End upper horizontal cross plate; 62-Movable door upper horizontal cross plate; 63-Fence door middle upright; 64-Movable door reinforcing rib plate; 65-Movable door end locking; 65-1-Locking rod; 65-2-Locking release limit rod; 65-3-Automatic locking spring; 66-Fence door frame reinforcing rib plate; 66-1-Stair locking hole; 67-Fence door frame middle upright; 68-Movable door middle locking; 7-Toe kick plate mechanism; 70-Lever; 71-Toe kick plate; 71-1-Toe kick plate folding edge; 71-2-Toe kick plate limit rod; 72-Limit nut; 80-Avoidance sliding support hinge; 80-1-First through hole; 80-2-First connecting pin shaft hole; 80-3-First support beam avoidance slot; 80-4-Avoidance space; 81-Straight-through sliding support hinge; 81-1-Second through hole; 81-2-Second connecting pin shaft hole; 81-3-Second support beam avoidance slot; 9-Drive ring; 90-Fixed ring; 90-1-Fixed ring auxiliary tool mounting hole; 90-2-Fixed ring external thread; 91-Adjusting ring; 91-1-Adjusting ring auxiliary tool mounting hole; 91-2-Adjusting ring internal thread; 10-Supporting crossbeam; 10-1-First pin shaft mounting hole; 10-2-Second pin shaft mounting hole; 11-Supporting inclined rod; 11-1-Third pin shaft mounting hole;11-2 - fourth pin shaft mounting hole; 11-3 - rotating delivery chute; 12 - fixed hinge base; 12-1 - fixed hinge base mounting plate; 12-2 - fixed hinge base connecting hole; 12-3 - fixed hinge base hinge groove; 130 - half cover plate; 130-1 - cover plate vent; 131 - quarter cover plate; 14 - control module; 15 - detector; 16 - audible and light alarm; 160 - audible and light alarm dedicated sleeve; 161 - audible and light alarm tail cover; 162 - audible and light alarm lamp; 163 - audible and light alarm sound component; 164 - audible and light alarm lampshade; 165 - audible and light alarm controllable battery; 17 - door lock actuator; 170 - up and down telescopic piston locking rod; 171 - up and down telescopic cylinder; 172 - front and rear moving piston rod; 173 - front and rear moving lever base; 174 - door lock actuator base. DETAILED DESCRIPTION

[0033] The preferred scheme is shown in Figures 1 to 31 A manhole cover plate fence linkage protection device with safety monitoring, the specific structure is as follows: The device base member provides a main base support for the present application, is installed on the inner wall of the opening, provides fixed support points for the mechanisms of the device, ensures the safety of the device in use, and is mainly composed of an upper support, a lower support and fasteners; the fence is a welded member as a whole, can be effectively designed according to the shape or size of the opening, is installed in the device base member, can be lifted up and down, realizes the overall lifting and lowering function of the fence, and the fence door has a safety interlocking function, when the system detects that the environment in the opening (well) is not suitable for personnel to work, the fence door cannot be opened, and only when the detection is qualified, the fence door can be opened, The fence is mainly composed of a sector fence, a fence door, a locking mechanism and a kickboard mechanism; The linkage mechanism is the main operating mechanism of the present application, and is also the main structural framework of the cover plate device of the present application. The opening cover plate is operated to open and close by lifting and lowering the top part of the fence, realizing the linkage function of the mechanism device. When the fence is effectively put in and taken out, the driving ring installed on the fence vertical rod can touch the sliding support hinge to move up and down, realizing effective control of the support beam, completing effective opening and closing operation of the cover plate. The linkage mechanism is mainly composed of a driving ring, a sliding support hinge, a support beam, a support inclined rod and a fixed hinge base; The cover plate is installed on the support beam of the linkage mechanism and can move with the support beam, is a covering component of the application, and can be divided into different types according to actual conditions on site, such as a grating cover plate, a steel cover plate and the like, to ensure that the hole is effectively covered; the monitoring system can detect the working environment inside the hole or the shaft, prompt the operating personnel through the sound and light and voice system according to the detection result, and can lock or unlock the fence door of the fence mechanism according to the detection result, to ensure the safety of the operating personnel. When the internal environment is not suitable for work, the system locks the fence door of the fence mechanism to prevent the operating personnel from entering the hole or the shaft, so that an unsafe event does not occur, and when the internal environment is suitable for work, the system unlocks the fence door of the fence mechanism, so that the operating personnel can enter the hole or the shaft, to ensure the safety of the operating personnel, and mainly comprises a control module, a fence position detection device, a detector, a sound and light alarm and a door lock execution mechanism.

[0034] The components required by the application are as follows: 1. The upper support 1 provides a mounting base for the device, fastening members (chemical thread sleeve 30 and fastening bolt 31) are used to install and fix the upper support 1 on the building base surface at the hole position, the body cross section is in the shape of Z, the upper lap edge of the Z-shaped part is provided with four mounting holes 1-1, the lower support table of the Z-shaped part is provided with three fence vertical rod first avoiding holes 1-2, a limiting boss 1-3 of the avoiding sliding support hinge 80 or the straight-through sliding support hinge 81 is arranged beside the fence vertical rod first avoiding hole 1-2, a toe kick plate push rod first avoiding hole 1-5 is arranged in the middle part of the limiting boss close to the wall body direction, the lower support table is provided with two toe kick plate first limiting holes 1-4, and the lower support table at the fence entering position is provided with a fence door up-down sliding first avoiding groove 1-6; the mounting and fixing hinge seat 12 of the support beam 10 and the support inclined rod 11 is arranged at the corresponding position of the upper support 1 corresponding to the cover plate 13, and is used to support the installation and use of the one-half cover plate 130 or the one-fourth cover plate 131 after full closing; 2、The lower support 2 provides guiding and locking functions for the fan-shaped fence 4 and the fence door 6 of the device, is welded to the mounting plate 12-1 by welding, the body cross section is in the shape of L, the lower support of the L-shaped four sides is respectively provided with three fence vertical rod second avoiding holes 2-1, the fence vertical rod second avoiding hole 2-1 is provided with a second avoiding hole 2-2 of the kick plate push rod in the middle part close to the wall direction, the lower support platform four sides are respectively provided with two second limiting holes 2-3 of the kick plate, wherein the lower support platform of the fence entering part is provided with a second avoiding groove 2-4 of the fence door up-down sliding, the lower part of the four sides of the lower support 2 is respectively provided with two locking hooks 55, can be used in cooperation with the locking tongue mechanism 54 installed on the fan-shaped fence 4, realizes the automatic locking of the fan-shaped fence 4 in the fully open state;Wherein the locking hook 55 is provided with a fence position detection device 140, can trigger the power supply switch of the power supply system, only when all the power supply switches are triggered, the power supply system can be powered and then power the monitoring system, which can effectively save the system power consumption and ensure the normal operation of the monitoring system.

[0035] 3、The fastener is used for installing the upper support 1, can safely and reliably install the upper support on the hole base 0, ensures the safe use of the device, mainly comprises a chemical thread sleeve 30 and a fastening bolt 31, the chemical thread sleeve 30 is provided with internal threads 30-2 and external threads 30-3 inside and outside, and is provided with an internal hexagonal hole 30-1 at the upper end, can be installed with the external hexagonal tool The external threads 30-3 are installed on the hole base 0 in cooperation with the chemical agent, and the internal threads 30-2 cooperate with the fastening bolt 31;The fastening bolt 31 passes through the mounting hole 1-1 of the upper support 1, and the upper support 1 is fixed to the hole base 0.

[0036] 4、Fan fence 4 is the fence function component of the application, which can be designed according to the shape of the site orifice. The application takes a square orifice as an example, and the whole is a fan component, mainly composed of an upper horizontal plate 41, a fence with a lock vertical rod 42, a fence vertical rod 43, a lower horizontal connecting plate 44 and a handle 45; the upper end is provided with the upper horizontal plate 41, the upper horizontal plate 41 is provided with three installation and welding avoidance holes 41-1 with two fence with lock vertical rods 42 and fence vertical rods 43, and two handle 45 installation rectangular avoidance holes 41-2; the fence with a lock vertical rod 42 is a hollow columnar structure type, the upper end is provided with an unlocking connecting rod 50 up and down movement avoidance slot 42-1, the lower part is provided with a U-shaped unlocking plate avoidance slot 42-2 and a lower horizontal connecting plate installation hole 42-3 and connects the lower horizontal connecting plate 44; the fence vertical rod 43 is a solid columnar structure type, the upper part is provided with a hollow function slot 43-1 for installing the sound and light alarm 16, the upper end is connected with the upper horizontal plate 41 by welding, the lower end is provided with an installation hole 43-2, and the lower horizontal connecting plate 44 is connected by bolt connection; the handle 45 is a half ring structure type, which is installed in the rectangular avoidance hole 41-2 of the upper horizontal plate 41 through a pin shaft; a kick plate lever 70 is welded at a position 180mm away from the ground in the full open state of the fence, which can reliably take out the kick plate 71 hidden in the device and support it at the orifice part, prevent tools and materials from falling into the hole, and ensure the safety of the area operation.

[0037] 5、Locking mechanism 5, the mechanism is a customized product, which realizes effective locking of the fan fence in the full open state, and is composed of an unlocking connecting rod 50, a handle 51, an unlocking plate 52, a lock tongue mechanism support 53, a lock tongue mechanism 54 and a locking hook 55. The unlocking connecting rod 50 is installed in the fence with a lock vertical rod 42 of the fan fence 4, the handle 51 moves up and down in the up and down movement avoidance slot 42-1 of the fence with a lock vertical rod 42, which can link and operate the unlocking plate 52 up and down, the upward operation of the unlocking plate 52 realizes the retraction movement of the lock tongue mechanism 54, wherein the lock tongue mechanism 54 is mainly composed of a shell 54-1, a lock tongue 54-2, a self-holding spring 54-3 and a driving rod 54-4; the lock tongue mechanism 54 is installed on the lower horizontal connecting plate 44 through the lock tongue mechanism support 53, the locking hook 55 is installed below the lower support 2, and the effective lap joint of the lock tongue mechanism 54 and the locking hook 55 realizes effective support of the fan fence; the self-holding spring 54-3 is installed on the spring positioning rod 54-1-1, and the self-holding spring 54-3 can keep the lock tongue 54-2 in the full extension state; 6、Fence door, is the main functional components of the device, installed in the entrance channel mouth parts, convenient for workers to enter and exit freely, the component is divided into fence door frame main body 6-A and movable door 6-B, movable door 6-B is installed on the fence with lock vertical rod 42, and can rotate around it to open and close operation, can be locked through the movable door end locking 65 in the closed state, prevent the movable door 6-B is misoperation, so as to ensure the safety of the fence door 6, meet the needs of personnel passing through. The main components of the mechanism have end horizontal plate 61, movable door horizontal plate 62, fence door middle vertical rod 63, movable door reinforcing rib plate 64, movable door end locking 65, fence door frame reinforcing rib plate 66, fence door frame middle vertical rod 67, movable door middle locking 68. Among them, the movable door end locking 65 is installed with the movable door reinforcing rib plate 64, the movable door end locking 65 is composed of locking rod 65-1, unlocking limiting rod 65-2 and automatic locking spring 65-3, and the specific execution mode is two modes: One is the personnel unlocking mode, the operator pulls the movable door end locking 65, then rotates 90°, and then places the unlocking limiting rod 65-2 on the upper surface of the movable door reinforcing rib plate 64, so that the locking rod 65-1 is separated from the stepped locking hole 66-1 of the fence door frame reinforcing rib plate 66, thereby realizing the unlocking function; The second mode is that the door lock actuator 17 pushes the front and rear moving lever seat (173) to push the upper and lower telescopic cylinder (171) to the movable door end locking 65 after receiving the system signal, and then the upper and lower telescopic piston locking rod 170 in the upper and lower telescopic cylinder (171) rises into the stepped locking hole 66-1 of the fence door frame reinforcing rib plate 66, so that the end of the upper and lower telescopic piston locking rod 170 is flush with the upper surface of the fence door frame reinforcing rib plate 66, and the locking rod 65-1 of the movable door end locking 65 is withdrawn from the stepped locking hole 66-1 of the fence door frame reinforcing rib plate 66, thereby realizing the unlocking function; 7. The kick plate mechanism 7 is a customized product, which is installed in the upper support 1 in a hidden manner, and is used to bring the sector fence 4 and the fence door 6 out of the hole when they are lifted to the end position, and to keep them in the hole position, so as to form an integral protection for the hole position, prevent the materials or tools in the hole position from being hung into the hole, and ensure the safety of the operation in the hole. The kick plate mechanism 7 mainly comprises a push rod 70, a kick plate 71 and a limiting nut 72. The upper part of the body of the kick plate 71 is provided with a folded edge 71-1 matched with the push rod 70 and a limiting rod 71-2 for limiting the running stroke of the kick plate 71. The push rod 70 is installed on the fence belt lock vertical rod 42 and the fence vertical rod 43 of the sector fence 4 and the fence belt lock vertical rod 42 and the fence door frame middle vertical rod 67 of the fence door 6. When the end working condition is pulled upward, the kick plate folded edge 71-1 is driven to run upward and is supported at the hole position, and the kick plate 71 is safely limited at the hole position under the joint action of the limiting rod 71-2 and the limiting nut 72, so as to ensure the safety of the operation at the hole position. 8. The avoidance sliding support hinge 80 is a customized product, which is used to avoid the installation position of the unlocking operation handle 51. The avoidance sliding support hinge 80 is provided with an avoidance space 80-4, which can avoid interference with the fence unlocking operation handle 51. The body of the avoidance sliding support hinge 80 is provided with a first through hole 80-1, which can slide up and down on the fence belt lock vertical rod 42. The upper end of the front component is provided with a first connecting pin shaft hole 80-2, and is also provided with a first support beam avoidance slot 80-3. The avoidance sliding support hinge 80 is connected with the support beam 10 through a pin shaft, and the avoidance sliding support hinge 80 is driven to move up and down by the driving ring 9, so as to drive the support beam 10 to move up and down and turn over, and realize the effective opening and closing function of the cover plate.

[0038] 9. The straight-through sliding support hinge 81 is a customized product, which is used to be installed at the position without the unlocking operation handle 51. The body of the straight-through sliding support hinge 81 is provided with a second through hole 81-1, which can slide up and down on the fence vertical rod 43. The upper end of the front component is provided with a second connecting pin shaft hole 81-2, and is also provided with a second support beam avoidance slot 81-3. The straight-through sliding support hinge 81 is connected with the support beam 10 through a pin shaft, and the straight-through sliding support hinge 81 is driven to move up and down by the driving ring 9, so as to drive the support beam 10 to move up and down and turn over, and realize the effective opening and closing function of the cover plate.

[0039] 10. A drive ring mounted on the fence belt lock stand 42 and fence stand 43 adapted position, used to drive the sliding support hinge 8, so as to achieve the effective opening and closing operation of the cover plate device, its body is composed of a fixed ring 90 and an adjusting ring 91, the fixed ring 90 is fixed on the stand by welding, the adjusting ring 91 is used for fine tuning the holding angle of the cover plate 13 in the fully open state, ensuring that the cover plate occupies a small space after opening, so as to not affect the up and down traffic of personnel and materials, wherein the fixed ring 90 is provided with auxiliary tool mounting hole 90-1 and external thread 90-2; the adjusting ring 91 is provided with auxiliary tool mounting hole 91-1 and internal thread 91-2; 11. A support beam, which is the main support member of the present application, the member is made of square section, one end of the member is provided with a first pin shaft mounting hole 10-1, which is connected with the connecting pin shaft hole on the sliding support hinge 8 through a connecting pin shaft, the other end of the member is provided with a second pin shaft mounting hole 10-2, which can be inserted into the rotating avoidance slot 11-3 on the support inclined rod 11 and connected with the fourth pin shaft mounting hole 11-2 on the support inclined rod 11 through a connecting pin shaft, the member can convert the reciprocating linear motion of the sliding support hinge 8 into the up and down opening and closing motion of the support beam 10, so as to drive the support inclined rod 11 linkage, and realize the effective opening and closing of the cover plate.

[0040] 12. A support inclined rod, which is the main driven member of the device, the member is made of square steel section, the lower end of the member body is provided with a third pin shaft mounting hole 11-1, which is mounted on the fixed hinge seat 12 of the upper bracket 1 through a connecting pin shaft and rotates around the hinge seat, and the fixed hinge seat 12 is provided with a limiting slot to limit the rotation angle and ensure that the support inclined rod 11 can be supported at the corresponding position after the cover plate is fully closed; the other end of the support inclined rod is also provided with a fourth pin shaft mounting hole 11-2 and a rotating avoidance slot 11-3, which can be effectively connected with the support beam 10 through a connecting pin shaft, so as to transmit the force of the support beam 10 to the support inclined rod 11, thereby driving the support inclined rod 11 to swing, achieving the purpose of opening and closing the cover plate.

[0041] 13. A fixed hinge seat, which is a customized product and the main support force member of the cover plate device, mainly composed of a mounting plate 12-1, a connecting hole 12-2 and a hinge slot 12-3, and the hinge slot 12-3 is provided with an angle θ, which is the swing angle of the support inclined rod 11 during the full closing and full opening motion of the cover plate 13, ensuring the effective support of the support inclined rod 11 at the full closing position of the cover plate 13, the mounting plate 12-1 is welded to the upper bracket 1 according to the installation situation, the connecting hole of the support inclined rod 11 and the fixed hinge seat 12 is connected through a connecting pin shaft, which can provide swing support for the support inclined rod 11, and under the limitation of the hinge slot 12-3, the support inclined rod 11 is supported at the full closing position of the cover plate, ensuring the safety of the support of the cover plate at the full closing position.

[0042] 14、Cover plate, the main functional component of the application, can be designed according to the shape of the hole, and the square hole is taken as an example. In order to facilitate personnel operation, the square hole cover plate is made into three pieces, one piece of half cover plate 130, which can be provided with or not provided with a ventilation hole 130-1 according to the needs, and two pieces of quarter cover plate 131. Each cover plate is welded and installed on the upper surface of the support beam 10. According to the size of the hole, the cover plate can be provided with a reinforcing rib plate, which is connected with the support beam 10 by welding. The installed cover plate 13 can move upwards with the support beam 10 and turn downwards, thereby realizing the opening and closing function of the hole cover plate. The cover plate can be a steel grating with hollow holes, a steel cover plate with full coverage, or a cover plate made of other materials.

[0043] 15、Control module, the main control core of the monitoring system. When the fence is in the fully open state, the fence position detection device 140 on the locking hook 55 can be triggered. When all the hole fence position detection devices 140 are triggered, the power supply system can be started to operate, and then the control module and other detection equipment can be powered on to effectively save system power consumption. After the control module is powered on, the collected on-site hole environment data is logically judged and processed, and then the processed results are fed back to each execution mechanism. The execution mechanism acts according to the received signal. When the monitoring data is qualified, the control module does not send operation instructions to the door lock control mechanism and the sound and light alarm system after receiving the signal, and the mechanism does not act. When the monitoring data is unqualified, the control module sends execution action instructions to the door lock control mechanism and the sound and light alarm system after receiving the signal, and performs corresponding operations according to the instructions. For example, if toxic and harmful materials are detected, the door lock control is executed to prevent personnel from entering, and a sound and light alarm signal is sent to warn personnel of danger. If the value detected does not affect the safety of personnel life, only a sound and light alarm signal is sent to warn personnel of danger. The control module is composed of a power supply system, a PLC processor, and electrical elements. 16、Detector, a customized product, which can be customized according to the operating environment in the hole, different detection components are adapted according to the detection content, and integrated design is performed to facilitate on-site installation and use. For the working environment in the limited space, the principle of "detecting first and then working" needs to be executed, and only after the system is determined to be qualified, the subsequent work can be executed. Table 1 Detection requirement quantization table

[0044] 17、Sound and light alarm 16, a customized product, mainly composed of a special pipe sleeve 160, a tail cover 161, a lamp tube 162, a sound generator 163, a lamp shade 164, and a controllable storage battery 165. It is installed in the hollow functional groove 43-1 of the fence vertical rod 43, can accept the signal of the control module, and execute sound and light alarm to prompt the dangerous situation in the hole and ensure the safety of the life and property of the workers. 18. The door lock actuator 17, a custom product, mainly composed of up and down telescopic piston locking rod 170, up and down telescopic cylinder 171, front and rear moving piston rod 172, front and rear moving lever seat 173 and door lock actuator base 174; The door lock actuator 17 can accept the signal of the control module, when detecting the safety of the hole environment, the door lock actuator 17 does not act, the operator pulls the active door end locking 65, and then rotates 90° to let the unlocking limiting rod 65-2 be placed on the active door reinforcing rib plate 64 upper surface, so that the locking rod 65-1 is separated from the ladder locking hole 66-1 of the fence door frame reinforcing rib plate 66, thereby realizing the unlocking function, and the active door 6-B can be freely opened and closed under manual operation, which is convenient for personnel to pass up and down; When the system detects that the hole environment is unsafe, the door lock actuator 17 executes the locking function under the control of the system, so that the active door 6-B cannot be opened, preventing personnel from entering the hole, and protecting the safety of personnel's life and property; The specific way is: the base 174 of the door lock actuator 17 is installed on the upper support 1, and the position is aligned with the active door 6-B end locking position, the front and rear moving piston rod 172 end is also installed on the upper support 1, the front and rear moving lever seat 173 is effectively connected with the up and down telescopic cylinder 171 in a welding manner, the front and rear moving lever seat 173 can slide on the door lock actuator base 174, and the up and down telescopic piston locking rod 170 can freely extend and retract in the up and down telescopic cylinder 171; When the system detects that the hole environment is unsafe, the front and rear moving piston rod 172 pushes the front and rear moving lever seat 173 to drive the up and down telescopic cylinder 171 to extend, when the up and down telescopic piston locking rod 170 in the up and down telescopic cylinder 171 is aligned with the ladder locking hole 66-1 of the fence door frame reinforcing rib plate 66, the extension operation is stopped, then the up and down telescopic piston locking rod 170 extends, and after passing through the ladder locking hole 66-1 of the fence door frame reinforcing rib plate 66, rises into the locking pin hole of the active door reinforcing rib plate 64, can effectively lock the active door 6-B on the fence door frame main body 6-A, so that the active door 6-B cannot be opened, preventing personnel from entering the hole, and protecting the safety of personnel's life and property; An operating method of a manhole cover fence linkage protection device with safety monitoring, comprising the following steps: S1, the whole manhole cover fence linkage protection device with safety monitoring is installed at the target hole position; S2, the fence door is lifted to the fully open position by the hidden handle on the fence door; During the lifting process, the kick plate is moved out and supported at the hole position by the kick plate moving with the lever on the fence door; The locking mechanism automatically acts, the locking tongue mechanism cooperates with the locking hook on the lower support to lock the fence door at the fully open position, and synchronously triggers the fence position detection device on the locking hook; S3, the sector fence is lifted one by one to the fully open position by the hidden handle on the sector fence; during the lifting process, the sector fence drives the linkage mechanism to move, and the linkage mechanism further drives the cover plate to open synchronously; at the same time, the sector fence drives the kick plate to move, and the kick plate is brought out and supported at the aperture position; the locking mechanism automatically acts, the locking tongue mechanism cooperates with the locking hook on the lower support to lock the sector fence at the fully open position, and the sector fence position detection device on the locking hook is triggered synchronously; S4, when all the sector fence position detection devices are triggered, the power supply system of the control module is powered on, and the control module starts to operate; the detector collects the environmental parameters in the hole in real time and transmits them to the control module, the control module makes logical judgment on the parameters, sends signals to the corresponding execution mechanism according to the judgment result, and the execution mechanism executes corresponding actions after receiving the signals; the judgment result includes that the toxic and harmful gas exceeds the standard, the humidity / temperature / liquid level exceeds the standard, the execution mechanism includes the sound and light alarm and the door lock execution mechanism; S4 substep is: S4.1 environmental safety judgment and action: if the detector detects that there is no toxic and harmful gas in the hole, the humidity is suitable, the temperature is comfortable, and the liquid level is normal, the control module judges that the environment is safe, and does not send action signals to the sound and light alarm and the door lock execution mechanism; At this time, the sound and light alarm does not alarm, the door lock execution mechanism does not act, and personnel can directly enter the subsequent sector door opening step; S4.2 toxic and harmful gas over standard judgment and action: if the detector detects that there is toxic and harmful gas such as methane, carbon monoxide, hydrogen sulfide, ammonia, hydrocarbon and nitrogen oxide in the hole, and the concentration exceeds the safety threshold, the control module judges that the environment is unsafe, and sends alarm signals to the sound and light alarm and locking signals to the door lock execution mechanism at the same time; the sound and light alarm sends out sound and light alarm prompt after receiving the signal, and the door lock execution mechanism executes the door locking operation after receiving the signal, so as to prevent the movable door from being opened; At this time, the process of "ventilation first, detection second, and operation third" needs to be performed, and after ventilation, the detector re-detects that the environmental parameters are qualified, the control module cancels the alarm signal and the door locking signal, and then the subsequent sector door opening step can be entered; S4.3 humidity / temperature / liquid level over standard judgment and action: if the detector only detects that the hole is greater than the threshold, the temperature exceeds the threshold range or the liquid level exceeds the normal range, and no toxic and harmful gas exceeds the standard, the control module judges that the environment has non-fatal risk, and only sends alarm signals to the sound and light alarm; the sound and light alarm sends out sound and light prompt after receiving the signal, and the door lock execution mechanism does not act, so that personnel can still enter the subsequent sector door opening step.

[0045] S5, the manual pull the active door end locking lever, after rotating 90°, make the unlocking limit lever placed on the active door reinforcement plate upper surface, keep the active door end locking in the unlocking state; then manually operate the active door middle locking installed in the fence door middle stand, release the limit relationship between the active door and the fence door frame body; finally rotate the active door around the fence lock stand, make the active door completely open, for personnel to enter and exit the aperture; at this time the fence door is opened; S6, when the personnel enter the hole or the hole operation is suspended, rotate the active door around the fence lock stand, close it to the fence door frame body; manually operate the active door middle locking, make the active door and the fence door frame body form the limit fixed; then manually operate the active door end locking lever, reverse rotate (90) °, release the self-holding state of the unlocking limit lever, under the elastic force of the automatic locking spring, the locking lever is inserted into the fence door frame reinforcement plate step locking hole, make the active door and the fence door frame body form the integral structure; at this time the fence door is closed; S7, when the hole operation is completed, close the shutter fence, operate the handle of the locking mechanism with both hands, the handle moves upward along the fence lock stand avoiding slot, drive the unlocking link and the unlocking plate to move upward synchronously; the unlocking plate pushes the driving rod of the lock tongue mechanism, make the lock tongue compress the self-holding spring and retract into the shell, release the cooperation between the lock tongue and the locking hook, release the locking of the shutter fence; the shutter fence moves downward under the action of gravity, at the same time, drive the linkage mechanism, cover plate and kick plate to close synchronously under the action of gravity; when the shutter fence moves to the end position of the device, slowly lower the shutter fence through the handle until it completely enters the device, realize the shutter fence full closing; S8, close the fence door, operate the handle of the locking mechanism with both hands, the handle moves upward along the fence lock stand avoiding slot, drive the unlocking link and the unlocking plate to move upward synchronously; the unlocking plate pushes the driving rod of the lock tongue mechanism, make the lock tongue compress the self-holding spring and retract into the shell, release the cooperation between the lock tongue and the locking hook, release the locking of the fence door; the fence door moves downward under the action of gravity, at the same time, the kick plate closes synchronously under the action of gravity; when the fence door moves to the end position of the device, slowly lower the fence door through the handle until it completely enters the device, realize the device full closing; S9, after the fence is completely closed, it is out of cooperation with the locking hook, the fence position detection device is no longer triggered; the power supply system of the control module loses power, the whole monitoring system stops running.

[0046] The above embodiments are only preferred technical solutions of the present application, and should not be regarded as limitations of the present application. The protection scope of the present application should be based on the technical solutions claimed in the claims, including equivalent replacement solutions of the technical features claimed in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the present application.

Claims

1. A manhole cover fence linkage protection device with safety monitoring, characterized in that: Includes the basic components of the device, the fence, the locking mechanism, the linkage mechanism, the cover plate (13) and the monitoring system; The basic components of the device are installed on the inner wall of the orifice; The fence is located within the foundation components of the device and can be raised and lowered. The fence consists of a fan-shaped fence (4) and a fence gate (6). The locking mechanism (5) is installed on the device base components and the fence for effective locking of the fence in the fully open isolation condition; The linkage mechanism connects the fence and the cover plate (13) respectively; The monitoring system includes a fence position detection device (140), a detector (15), an audible and visual alarm (16), a door lock actuator (17), and a control module. The fence position detection device (140) is mounted on the locking mechanism (5), the detector (15) is installed at the bottom of the confined space, and the control module is installed in the gap of the device's foundation components. The output signals of the fence position detection device (140) and the detector (15) are connected to the control module. When the fence position detection device (140) detects that the locking mechanism (5) is not in place when the fence (4) or the fence door (6) is fully open, it outputs a signal to the control module, and the control module transmits the execution signal to the audible and visual alarm (16) to trigger an alarm. When the detector (15) detects an environmental hazard, it outputs a signal to the control module, and the control module transmits the execution signal to the audible and visual alarm (16) to trigger an alarm or the door lock actuator (17) to perform a door locking operation.

2. The manhole cover fence linkage protection device with safety monitoring according to claim 1, characterized in that: The basic components of the device include an upper bracket (1), a lower bracket (2) and fasteners (3); the upper bracket (1) is installed on the orifice foundation (0) by the fasteners (3), the lower bracket (2) is installed on the mounting plate (12-1), and the mounting plate (12-1) is connected to the upper bracket (1).

3. A manhole cover fence linkage protection device with safety monitoring as described in claim 2, characterized in that: The upper support (1) has a Z-shaped cross-section; the upper overlapping edge of the upper support (1) is provided with mounting holes (1-1). The lower support platform of the upper bracket (1) is provided with a first clearance hole (1-2) for the fence post, and a limiting boss (1-3) is provided next to the first clearance hole (1-2) for the fence post. A first clearance hole (1-5) for the kick plate lever is provided in the middle part of the limiting boss (1-3) near the wall. The lower support platform is provided with a first limiting hole (1-4) for the kick plate. The lower support platform on the side where the fence door (6) is installed is provided with a first clearance groove (1-6) for the fence door (6) to slide up and down. The upper bracket (1) is provided with a support beam (10), a support diagonal rod (11) and a fixed hinge seat (12) at the corresponding position of the cover plate (13).

4. A manhole cover fence linkage protection device with safety monitoring as described in claim 2, characterized in that: The lower support (2) is located below the upper support (1), and the cross-section of the lower support (2) is L-shaped. The lower support platform of the lower support (2) is provided with a second clearance hole (2-1) for the fence post, and a second clearance hole (2-2) for the kick plate lever is provided in the middle part of the second clearance hole (2-1) near the wall. Each side of the lower support platform of the lower support (2) is provided with a second limit hole (2-3) for the kick plate, and the lower support platform on the side where the fence door (6) is installed is provided with a second clearance groove (2-4) for the fence door (6) to slide up and down. A locking hook (55) is installed at the lower part of the lower support (2), and a fence position detection device (140) is installed on the locking hook (55).

5. A manhole cover fence linkage protection device with safety monitoring as described in claim 3, characterized in that: The fastener (3) includes a chemical threaded sleeve (30) and a fastening bolt (31); the chemical threaded sleeve (30) is provided with threads on both the inside and outside, namely an internal thread (30-2) and an external thread (30-3), and an internal hexagonal hole (30-1) is provided at the upper end of the inside, which can be used with an external hexagonal tool to install the threaded sleeve (30). The external thread (30-3) is installed on the hole foundation (0) in conjunction with the chemical agent, and the internal thread (30-2) is in conjunction with the fastening bolt (31); the fastening bolt (31) passes through the mounting hole (1-1) of the upper bracket (1) to fix the upper bracket (1) to the hole foundation (0).

6. A manhole cover fence linkage protection device with safety monitoring as described in claim 1, characterized in that: The fence includes a fan-shaped fence (4) and a fence gate (6); The fan-shaped fence (4) includes an upper horizontal plate (41), a fence with lockable uprights (42), a fence uprights (43), a lower horizontal connecting plate (44), and a handle (45); the upper horizontal plate (41) and the lower horizontal connecting plate (44) are connected by the fence with lockable uprights (42) and the fence uprights (43), and the upper horizontal plate (41) is provided with a handle (45). The upper horizontal plate (41) is provided with a welding clearance hole (41-1) and a rectangular clearance hole (41-2) for the handle installation. The fence with locking posts (42) is provided with a clearance slot (42-1), a U-shaped unlocking plate clearance slot (42-2) and a lower horizontal connecting plate mounting hole (42-3) and is connected to the lower horizontal connecting plate (44). The upper end of the fence post (43) is provided with a hollow functional groove (43-1), and the lower end is provided with an installation hole (43-2) and connected to the lower horizontal connecting plate (44). The handle (45) is mounted on a rectangular clearance hole (41-2) for mounting the handle.

7. A manhole cover fence linkage protection device with safety monitoring as described in claim 6, characterized in that: The fence gate (6) includes a frame body (6-A) and a movable gate (6-B); the movable gate (6-B) is mounted on the fence with a locking post (42) and can rotate around it to realize the opening and closing operation; The fence gate (6) is equipped with a door end lock (65) and a door center lock (68). The door end lock (65) and the door center lock (68) are used to lock the gate in the closed state to prevent the gate (6-B) from being accidentally operated. The movable door end lock (65) is installed on the movable door reinforcing rib plate (64), and the movable door end lock (65) can be inserted into the fence door frame reinforcing rib plate (66) to restrict rotational connection; the movable door reinforcing rib plate (64) is connected to the fence door central upright (63), and the fence door central upright (63) is provided with a movable door central lock (68) and can move up and down. The movable door central lock (68) can be inserted into the fence door frame central upright (67) of the frame body (6-A) to restrict rotational connection; The upper horizontal plate (62) of the movable door is rotatably connected to the upper horizontal plate (61) at the end.

8. A manhole cover fence linkage protection device with safety monitoring as described in claim 7, characterized in that: The movable door end lock (65) includes a locking rod (65-1), a release locking limit rod (65-2), and an automatic locking spring (65-3). The locking rod (65-1) is adapted to the stepped locking hole (66-1) of the fence door frame reinforcing rib plate (66). The automatic locking spring (65-3) is sleeved on the locking rod (65-1). The release locking limit rod (65-2) is installed on the locking rod (65-1) and located above the automatic locking spring (65-3). The locking rod (65-1) is movably installed on the movable door reinforcing rib plate (64). After the release locking limit rod (65-2) rotates, it will prevent the locking rod (65-1) from moving downward.

9. A manhole cover fence linkage protection device with safety monitoring as described in claim 6, characterized in that: The locking mechanism (5) includes an unlocking link (50), a handle (51), an unlocking plate (52), a latch mechanism bracket (53), a latch mechanism (54), and a locking hook (55). The unlocking link (50) is installed inside the locking post (42) of the fence and can move up and down; The handle (51) is installed on the upper end of the unlocking linkage (50) and can move up and down in the vertical movement clearance groove (42-1) of the fence locking upright (42) to perform linkage up and down operation on the unlocking plate (52); The upward operation of the unlocking plate (52) enables the retraction of the locking tongue mechanism (54).

10. A manhole cover fence linkage protection device with safety monitoring as described in claim 9, characterized in that: The locking tongue mechanism (54) includes a housing (54-1), a locking tongue (54-2), a self-holding spring (54-3), and a drive rod (54-4). The locking tongue (54-2) and the self-holding spring (54-3) are installed inside the housing (54-1). The self-holding spring (54-3) is installed on the spring positioning rod (54-1-1) and fits into the locking tongue spring mounting hole (54-2-1). The self-holding spring (54-3) can keep the locking tongue (54-2) in a fully extended state. When the locking tongue (54-2) is compressed, it will compress the self-holding spring (54-3) synchronously. The locking tongue (54-2) is provided with a slide rod (54-2-2). The slide rod (54-2-2) is adapted to the slide groove (54-4-1). The slide groove is set on the drive rod (54-4). When the drive rod (54-4) moves upward, it will drive the locking tongue (54-2) to retract. The drive lever (54-4) is driven to move by the unlocking plate (52); The locking tongue mechanism (54) is mounted on the lower horizontal connecting plate (44) via the locking tongue mechanism bracket (53), and the locking hook (55) is mounted below the lower bracket (2). The effective overlap of the locking tongue mechanism (54) and the locking hook (55) provides effective support for the fence.

11. A manhole cover fence linkage protection device with safety monitoring as described in claim 9, characterized in that: It also includes a kick plate mechanism (7), which is installed inside the upper bracket (1) and is brought out when the fence is raised to the end position and held at the opening. The kick plate mechanism (7) includes a lever (70), a kick plate (71), and a limiting nut (72); The lever (70) is installed on the fence with lock post (42) and fence post (43); the upper part of the kick plate (71) is provided with a folded edge (71-1), which cooperates with the lever (70) and receives the lifting force of the lever (70); the kick plate (71) is provided with a limiting rod (71-2), which passes through the first limiting hole (1-4) of the kick plate of the upper bracket (1) and the second clearance hole (2-2) of the kick plate lever of the lower bracket (2) and cooperates with the limiting nut (72).

12. A manhole cover fence linkage protection device with safety monitoring as described in claim 9, characterized in that: The linkage mechanism includes a drive ring (9), a sliding support hinge (8), a support beam (10), a support diagonal rod (11), and a fixed hinge seat (12). The supporting diagonal rod (11) is connected to the fixed hinge seat (12) by a pin; the supporting diagonal rod (11) is connected to the supporting crossbeam (10) by a pin; the cover plate (13) is installed on the supporting crossbeam (10); The drive ring (9) is installed on the fence with locking post (42) and fence post (43); the drive ring (9) includes a fixed ring (90) and an adjusting ring (91), the adjusting ring (91) is connected to the external thread (90-2) of the fixed ring (90) through the internal thread (91-2); the adjusting ring (91) is used to fine adjust the holding angle of the cover plate (13) in the fully open state; The sliding support hinge (8) includes an avoidance sliding support hinge (80) and a through sliding support hinge (81); The sliding support hinge (80) is provided with a clearance space (80-4) to avoid interference with the fence unlocking operation handle (51); the sliding support hinge (80) is provided with a first through hole (80-1), which is installed on the fence locking post (42) and can slide up and down on it; the upper end of the sliding support hinge (80) is provided with a first connecting pin hole (80-2), and the sliding support hinge (80) is provided with a first support beam clearance groove (80-3); The through sliding support hinge (81) is provided with a second through hole (81-1) for installation on the fence post (43) and for sliding up and down on it. The upper front end of the through sliding support hinge (81) is provided with a second connecting pin hole (81-2) and a second support beam clearance groove (81-3). The sliding support hinge (8) is connected to the support beam (10) by a pin. The sliding support hinge (8) is driven up and down by the drive ring (9), thereby causing the support beam (10) to flip up and down, so as to realize the effective opening and closing function of the cover plate.

13. A manhole cover fence linkage protection device with safety monitoring as described in claim 12, characterized in that: The supporting beam (10) is a square profile. One end is provided with a first pin mounting hole (10-1) for connecting the sliding support hinge (8), and the other end is provided with a second pin mounting hole (10-2) for connecting the supporting diagonal rod (11). The reciprocating linear motion of the sliding support hinge (8) is converted into the up-and-down opening and closing motion of the supporting beam (10), thereby driving the supporting diagonal rod (11) to work together to achieve the effective opening and closing of the cover plate. The lower end of the support diagonal rod (11) is provided with a third pin mounting hole (11-1) for connecting the fixed hinge seat (12), and the upper end is provided with a fourth pin mounting hole (11-2) and a rotation transfer groove (11-3) for connecting the second pin mounting hole (10-2) of the support beam (10). The fixed hinge base (12) includes a mounting plate (12-1), a connecting hole (12-2) and a hinge groove (12-3). The hinge groove (12-3) is set with an angle θ, which is the swing angle θ of the support rod (11) from fully open to fully closed on the cover plate (13). The mounting plate (12-1) is mounted on the bracket (1), and the connecting hole (12-2) is set on the hinge groove (12-3).

14. A manhole cover fence linkage protection device with safety monitoring as described in claim 1, characterized in that: The cover plate (13) is a square cover plate, which includes (1) a half cover plate (130) and (2) a quarter cover plate (131); the (1) half cover plate (130) and the (2) quarter cover plates (131) together form a whole square cover plate (13). The linkage mechanism that drives the movement of the half-cover plate (130) and the quarter-cover plate (131) has the same structure; The cover plate (13) is installed on the upper surface of the support beam (10), and a reinforcing rib is provided between the cover plate (13) and the support beam (10).

15. A manhole cover fence linkage protection device with safety monitoring as described in claim 1, characterized in that: The sound and light alarm (16) includes a special tube sleeve (160), a tail cap (161), a lamp tube (162), a sound-generating component (163), a lamp cover (164), and a controllable battery (165). The special tube sleeve (160) has a tail cap (161) at the bottom, a lampshade (164) at the top, a sound-generating component (163) below the lampshade (164), a window on the outer wall of the special tube sleeve (160), a lamp tube (162) inside the window, and a controllable battery (165) for powering the lamp tube (162) and the sound-generating component (163).

16. A manhole cover fence linkage protection device with safety monitoring as described in claim 7, characterized in that: It also includes a door lock actuator (17), which includes an upper and lower telescopic piston locking rod (170), an upper and lower telescopic cylinder (171), a front and rear moving piston rod (172), a front and rear moving lever seat (173), and a base (174). The base (174) is installed on the upper bracket (1) and its position is aligned with the locking position at the end of the movable door (6-B). One end of the front and rear moving piston rod (172) is installed on the upper bracket (1) and the other end is installed on the front and rear moving lever seat (173). The front and rear moving lever seat (173) is connected to the upper and lower telescopic cylinder (171) by welding. The front and rear moving lever seat (173) can slide on the base (174) of the door lock actuator. The upper and lower telescopic piston locking rod (170) can freely extend and retract in the upper and lower telescopic cylinder (171).

17. A manhole cover fence linkage protection device with safety monitoring as described in claim 6, characterized in that: It also includes an external driving force mechanism, which is a hydraulic drive mechanism or an electric motor drive mechanism, and the external driving force mechanism is connected to the fan-shaped fence (4).

18. A manhole cover fence linkage protection device with safety monitoring as described in claim 16, characterized in that: The control module adopts an integrated design and is installed on the basic components of the device; the audible and visual alarm (16) is installed on the fence, and the door lock actuator (17) is installed on the basic structural components of the device, which receives the signal from the control module to perform the locking or unlocking action of the fence gate (6) of the fence.

19. The operation method of a manhole cover fence linkage protection device with safety monitoring according to any one of claims 1-18, characterized in that... Includes the following steps: S1, Install the manhole cover fence linkage protection device with safety monitoring at the target opening position; S2, by using the hidden handle (45) on the fence gate (6), the fence gate (6) is lifted to the fully open position; during the lifting process, the lever (70) on the fence gate (6) drives the kick plate (71) to move, bringing the kick plate (71) out and supporting it at the opening position; the locking mechanism (5) is automatically activated, and its locking tongue mechanism (54) cooperates with the locking hook (55) on the lower bracket (2) to lock the fence gate (6) in the fully open position, and simultaneously triggers the fence position detection device (140) on the locking hook (55). S3, by using the hidden handle (45) on the fan-shaped fence (4), the fan-shaped fence (4) is lifted one by one to the fully open position; during the lifting process, the fan-shaped fence (4) drives the linkage mechanism to move, and the linkage mechanism further drives the cover plate (13) to open synchronously; at the same time, the lever (70) on the fan-shaped fence (4) drives the kick plate (71) to move, bringing out the kick plate (71) and supporting it at the opening position; the locking mechanism (5) automatically operates, and its locking tongue mechanism (54) cooperates with the locking hook (55) on the lower bracket (2) to lock the fan-shaped fence (4) in the fully open position, and simultaneously triggers the fence position detection device (140) on the locking hook (55). S4, when all fence position detection devices (140) are triggered, the power supply system of the control module is powered on and the control module starts running; the detector (15) collects environmental parameters inside the hole in real time and transmits them to the control module. The control module performs logical judgment on the parameters and sends a signal to the corresponding actuator according to the judgment result. The actuator receives the signal and performs the corresponding action; the judgment result includes excessive toxic and harmful gases, excessive humidity / temperature / liquid level, and the actuator includes an audible and visual alarm (16) and a door lock actuator (17). S5, manually pull the locking rod (65-1) of the end lock (65) of the movable door, rotate it (90)° and place the unlocking limit rod (65-2) on the upper surface of the movable door reinforcing rib plate (64) to keep the end lock (65) of the movable door in the unlocked state; then manually operate the movable door lock (68) installed in the middle upright (63) of the fence door to release the limiting relationship between the movable door (6-B) and the main body of the fence door frame (6-A); finally rotate the movable door (6-B) around the fence locking upright (42) to fully open the movable door (6-B) for personnel to enter and exit; at this time the fence door is open; S6, when personnel enter the hole or work inside the hole is suspended, rotate the movable door (6-B) around the locking post (42) of the fence to close it until it fits against the main body of the fence door frame (6-A); manually operate the locking (68) of the movable door to make the movable door (6-B) and the main body of the fence door frame (6-A) form a limited fixation; then manually operate the locking rod (65-1) of the locking (65) at the end of the movable door to rotate it in the opposite direction (90)° to release the self-holding state of the locking limit rod (65-2). Under the elastic force of the automatic locking spring (65-3), the locking rod (65-1) is inserted into the stepped locking hole (66-1) of the reinforcing rib plate (66) of the fence door frame, so that the movable door (6-B) and the main body of the fence door frame (6-A) form an integral structure; at this time, the fence door is closed; S7, after the work inside the hole is completed, close the fan-shaped fence (4), operate the handle (51) of the locking mechanism (5) with both hands, the handle (51) moves upward along the clearance slot (42-1) of the fence locking rod (42), driving the unlocking link (50) and the unlocking plate (52) to move upward synchronously; the unlocking plate (52) pushes the drive rod (54-4) of the locking tongue mechanism (54), causing the locking tongue (54-2) to compress the self-holding spring (54-3) and move towards the outer shell (54-1). The internal retraction releases the locking tongue (54-2) and locking hook (55), releasing the lock on the fan-shaped fence (4); the fan-shaped fence (4) moves downward under its own weight, simultaneously driving the linkage mechanism, cover plate (13) and kick plate (71) to close synchronously under its own weight; when the fan-shaped fence (4) moves to the position close to the end of the device, the fan-shaped fence (4) is slowly lowered by the handle (45) until it is completely inside the device, realizing the full closure of the fan-shaped fence (4); S8, close the fence gate (6), operate the handle (51) of the locking mechanism (5) with both hands, the handle (51) moves upward along the clearance slot (42-1) of the fence locking rod (42), driving the unlocking link (50) and the unlocking plate (52) to move upward synchronously; the unlocking plate (52) pushes the drive rod (54-4) of the locking tongue mechanism (54), causing the locking tongue (54-2) to compress the self-holding spring (54-3) and retract into the outer shell (54-1), releasing the engagement between the locking tongue (54-2) and the locking hook (55), releasing the lock on the fence gate (6); the fence gate (6) moves downward under its own weight, and the kick plate (71) closes synchronously under its own weight; when the fence gate (6) moves to the position close to the end of the device, slowly lower the fence gate (6) through the handle (45) until it is completely inside the device, realizing the device is fully closed; S9, after the fence is completely closed, it disengages from the locking hook (55), and the fence position detection device (140) is no longer triggered; the power supply system of the control module loses power, and the entire monitoring system stops operating.

20. The operating method of the manhole cover fence linkage protection device with safety monitoring according to claim 19, characterized in that: The S4 sub-step is as follows: S4.1 Environmental safety judgment and action: If the detector (15) detects that there are no toxic or harmful gases in the hole, the humidity is suitable, the temperature is comfortable and the liquid level is normal, the control module determines that the environment is safe and does not send action signals to the audible and visual alarm (16) and the door lock actuator (17); at this time, the audible and visual alarm (16) does not alarm, the door lock actuator (17) does not act, and personnel can directly enter the subsequent fence door opening steps; S4.2 Determination and Action of Exceeding Standards for Toxic and Harmful Gases: If the detector (15) detects the presence of toxic and harmful gases such as methane, carbon monoxide, hydrogen sulfide, ammonia, hydrocarbons, and nitrogen oxides in the hole, and the concentration exceeds the safety threshold, the control module determines that the environment is unsafe and simultaneously sends an alarm signal to the audible and visual alarm (16) and a locking signal to the door lock actuator (17); after receiving the signal, the audible and visual alarm (16) issues an audible and visual alarm prompt, and after receiving the signal, the door lock actuator (17) performs a locking operation to prevent the movable door (6-B) from opening; at this time, the process of "ventilation first, detection then operation" must be followed. After ventilation, the detector (15) re-detects that the environmental parameters are qualified, and the control module releases the alarm signal and the locking signal before proceeding to the subsequent fence door opening step; S4.3, Humidity / Temperature / Liquid Level Exceedance Judgment and Action: If the detector (15) only detects that the humidity in the hole is greater than the threshold, the temperature exceeds the threshold range, or the liquid level exceeds the normal range, and does not detect excessive toxic or harmful gases, the control module determines that there is a non-fatal risk in the environment and only sends an alarm signal to the audible and visual alarm (16); after receiving the signal, the audible and visual alarm (16) issues an audible and visual prompt, the door lock actuator (17) does not act, and personnel can still enter the subsequent fence door opening steps.

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