Safety action protection device and method for coke pusher

Abstract

The invention belongs to the field of coke pusher safety protection, and particularly discloses a coke pusher safety action protection device which comprises a door frame transverse iron detection assembly and a small furnace door opening detection assembly. The door frame transverse iron detection assembly comprises door frame transverse iron, a transverse iron detection piece, a proximity switch used for detecting the door frame transverse iron and a latch opening and closing sensor; the small furnace door opening detection assembly comprises a residual coal chute, a small furnace door detection piece and a small furnace door proximity switch; and the door frame cross iron proximity switch, the latch opening and closing sensor, the small furnace door proximity switch and the chute sensor are electrically connected with the coke pusher safety action protection system respectively. The invention further provides a coke pusher safety action protection method. In order to solve the problems that in the prior art, whether door frame cross iron is in place or not cannot be detected and a small furnace door is not actually opened during coal leveling, safety protection is achieved through interlocking of mechanical parts and a control system.

Description

Technical Field

[0001] The present invention relates to the technical field of remote control of pusher cars, and mainly relates to a safety action protection device for pusher cars. The present invention also provides a safety action protection method for pusher cars. Background Art

[0002] Since the coke oven was put into use in 2021, all the original designed functions have been fully put into use. However, the operation mode of the four major vehicles still remains in the manned and unmanned operation mode, resulting in a large manual labor load, potential safety hazards, and greatly restricting the utilization efficiency of equipment and systems.

[0003] With the development of the intelligentization of the steel industry becoming a new requirement, the function of unmanned operation on the vehicle has been realized. For the mechanical equipment of the 7.65-meter coke oven, it is imperative to upgrade the pushing work to an unmanned operation mode of remote one-key full furnace group cycle operation.

[0004] As an indispensable and important equipment among the four major vehicles in coking production, the pusher car has begun to develop towards large-scale, automation, and intelligentization. Pushing the door and leveling the coal are the two main functions of the pusher car. The door-taking action relies on the sliding arm door hook to hook the furnace door, and through the up and down movement of the sliding arm, the door-lifting and door-dropping actions are completed. Then, the forward and backward movement of the door-taking trolley completes the forward and backward movement of the door-taking machine. The coal-leveling action relies on the coal-leveling trolley to control the forward and backward movement of the coal-leveling rod, and the small furnace door is controlled by the opener to open and close. After the coal-leveling chute drops, the small furnace door is opened by the small furnace door opener, and the coal-leveling trolley controls the forward movement of the coal-leveling rod. After reaching the position, the remaining coal brought out is retracted.

[0005] During the normal coking production process, the door-taking action of the pusher car may have problems in detecting whether the upper cross iron is in place. If the connecting rod of the furnace door is deformed, the pin shaft of the connecting rod falls off, or the connecting rod breaks, etc., it will cause the upper cross iron to not close in place, and then cause the furnace door to fall, leading to equipment and safety problems; in the coal-leveling action, the small furnace door may actually not be opened, but the opening mechanism stroke of the small furnace door is misjudged to be opened, which will cause the subsequent forward movement of the coal-leveling rod to hit the small furnace door and damage the coal-leveling rod. At present, coking enterprises are all realizing the unmanned operation function, and solving the above two problems and improving the production safety ability have become an inevitable development trend. Summary of the Invention

[0006] In order to overcome the problems that the prior art cannot detect whether the cross iron of the door frame is in place and the problem that the small furnace door is actually not opened during coal leveling, the present invention provides a safety action protection device for a pusher car that ensures safety through the interlock of mechanical parts and the control system.

[0007] The technical solution adopted by the present invention to achieve the above purpose is: A safety action protection device for a coke pusher includes a cross iron detection component for the door frame and a small furnace door opening detection component. The cross iron detection component for the door frame includes a cross iron for fixing the furnace door, a cross iron detector located at the bottom of any end of the cross iron, a cross iron proximity switch for detecting whether the cross iron for the door frame is in place when opened or closed, and a latch opening and closing sensor. A suspension bracket is provided outside the furnace door. At the bottom of the lowest point where the cross iron for the door frame descends on the side of the suspension bracket, a cross iron detector is installed, and a cross iron proximity switch is provided at the position after the cross iron detector is restored. One end of the cross iron detector contacts the bottom of the cross iron. After the cross iron for the door frame is installed and the suspension bracket retreats, the other end of the cross iron detector touches the cross iron proximity switch. The small furnace door opening detection component includes a surplus coal chute for receiving the remaining coal during the opening of the small furnace door, a small furnace door detector provided at the bottom of the surplus coal chute, and a small furnace door proximity switch. When the small furnace door is in the open state, one end of the furnace door detector touches the small furnace door proximity switch, and the other end touches the surplus coal chute sensor at the bottom of the surplus coal chute. The cross iron proximity switch, the latch opening and closing sensor, the small furnace door proximity switch, and the surplus coal chute sensor are respectively electrically connected to the safety action protection system of the coke pusher.

[0008] Further, the cross iron detector includes a first connecting rod and a second connecting rod. One end of the first connecting rod contacts the bottom of the cross iron. The other end of the first connecting rod is connected to one end of the second connecting rod through a rotating shaft on the suspension bracket. The other end of the second connecting rod touches the cross iron proximity switch.

[0009] Further, the small furnace door detector is in a V shape. The bottom of the V shape is connected to the bottom of the surplus coal chute. One corner of the V shape touches the small furnace door proximity switch and the chute sensor fixed to the bottom of the surplus coal chute when the small furnace door is opened. After the small furnace door is closed, the bottom of the surplus coal chute moves upward, and the other corner of the V shape touches the small furnace door proximity switch.

[0010] Further, the safety action protection system of the coke pusher includes a substation PLC, a main station PLC, and a host computer. One end of the substation PLC is electrically connected to the host computer through the main station PLC. The substation PLC includes a DI module. The DI module is respectively electrically connected to the cross iron proximity switch, the small furnace door proximity switch, the latch opening and closing sensor, and the surplus coal chute sensor.

[0011] Preferably, the fireproof wires, conduits, and sleeves used for the cross iron proximity switch, the small furnace door proximity switch, the latch opening and closing sensor, and the surplus coal chute sensor and the junction box are all made of fire-resistant materials.

[0012] The present invention also provides a safety operation protection method for a coke pusher, which includes the following steps: The coke pusher performs the coke pushing procedure in advance. The door removing machine performs the door removing work and reaches the designated position. The door lifting oil cylinder is guided in the slewing frame through the guide frame device, drives the sliding arm to move upward, makes the upper door hook and the lower door hook hang on the furnace door column, the door pressing oil cylinder acts to press the door, and the door latch oil cylinder acts to lift the cross iron of the door frame; When the door removing machine lifts the door, one end of the cross iron detection piece of the door frame just contacts one end of the cross iron due to the upward movement of the sliding arm, so that the other end of the cross iron detection piece of the door frame warps up to the designated position to make the proximity switch of the cross iron of the door frame sense; The signal of the proximity switch of the cross iron of the door frame is transmitted to the DI module in the PLC, and the "I" point of the DI module is set as the interlock condition for the backward movement of the door latch. When the value of the door latch opening and closing sensor and the proximity switch of the cross iron of the door frame simultaneously meet the condition of the opened cross iron of the door frame, the door latch oil cylinder acts to lift the cross iron of the door frame, and the cross iron detection piece returns to its original position by relying on its own gravity without force. The door lifting oil cylinder drives the sliding frame to continue moving upward in the suspension frame, and the tilting oil cylinder of the door removing machine starts, drives the furnace door to tilt backward and retreat, and completes the door removing; The door installation step is opposite to the door removal process. When the step proceeds to closing the cross iron of the door frame, the door latch oil cylinder drops, the door latch opening and closing sensor senses and gives a value, the cross iron falls into the balance groove of the furnace door, and the cross iron relies on the falling gravity to press the cross iron detection piece of the door frame again to the proximity switch of the cross iron of the door frame. The proximity switch of the cross iron of the door frame outputs a signal for the next step of door installation. When the cross iron detection piece of the door frame is not in place and cannot make the proximity switch of the cross iron of the door frame emit a signal, or the door frame opening and closing sensor has no signal, it proves that the cross iron of the door frame is not in place. Triggering the interlock to press the door latch will not be able to retreat to avoid the furnace door from falling, and the door removal mechanism starts to alarm and requires manual confirmation before continuing the door installation operation; The small furnace door opening detection device: When the coal leveling operation is carried out, first, the small furnace door opener descends to the opening position, and then the small furnace door hook advances to open the small furnace door. When the residual coal chute is falling and rotating, the small furnace door detection piece rotates the same angle as the residual coal chute. When the residual coal chute advances to the in-place position, both corners of the V-shaped small furnace door detection piece simultaneously contact the small furnace door proximity switch, one corner of the residual coal chute sensor reaches the induction specified position of the small furnace door proximity switch, and the other corner leaves to the residual coal chute sensor. The signal of the small furnace door proximity switch is transmitted to the PLC DI module, and the "I" point of the DI module is set as the interlock condition for the forward movement of the coal leveling rod. When the residual coal chute is not in place and cannot make the small furnace door detection piece reach the specified position, the small furnace door proximity switch cannot output a signal. After the small furnace door detection piece triggers the small furnace door proximity switch and the residual coal chute sensor movement, and the numerical values of both points are satisfied simultaneously, the coal leveling rod can move. Otherwise, the coal leveling rod does not move and an alarm is given, and manual intervention and inspection are required before continuing to move. If the coal leveling rod retracts after the coal leveling is completed and the residual coal chute rises and rotates, the small furnace door detection piece also makes the same angle. When one corner of the V-shaped small furnace door detection piece reaches the induction specified position of the small furnace door proximity switch and the other corner leaves to the residual coal chute sensor and outputs a signal, the small furnace door is closed. When the coal leveling rod is not retracted or the residual coal chute is not lifted, the remaining steps cannot be carried out.

[0013] The crossbar detection component of the door frame and the small furnace door opening detection adopt the same principle. The difference lies in the installation positions of the detection mechanism and the control switch. The function of the remote camera is for remote monitoring. When the crossbar of the door frame or the small furnace door touches the detection piece, the displacement of the detection piece and the proximity switch is close, and the transmitted signal is transmitted to the background program, and subsequent actions can be carried out. When an abnormal situation occurs and the detection mechanism cannot approach the proximity switch, there is no transmitted signal, and the subsequent program cannot be effectively carried out. An alarm will be given, and manual inspection is required before starting. The function of the camera can complete remote manual detection and intervention.

[0014] The structure of the present invention is simple, with high safety performance, small investment, and simple operation. Through the coordinated cooperation of the control switch and the mechanism, it effectively solves the situation where the small furnace door cannot be opened and the crossbar of the furnace door is not in place, and reduces the operation risk. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the coke pusher's furnace door installation structure; Figure 2 It is Figure 1 The cross-sectional schematic diagram; Figure 3 It is a schematic diagram of the movement of the crossbar of the door frame; Figure 4 It is a schematic diagram of the coal leveling structure of the coke pusher; Figure 5 It is a schematic diagram of the safety action protection control system of the coke pusher; Description of reference numerals: It includes the slewing frame 1-1, the door lifting oil cylinder 1-2, the upper door hook 1-3, the sliding arm 1-4, the lower door hook 1-5, the cross iron detector 1-6 of the door frame, the proximity switch 1-7 of the cross iron of the door frame, the balance groove 1-8 of the furnace door, the bolt oil cylinder 1-9, the cross iron 1-10 of the door frame, the door pressing oil cylinder 1-11, the furnace door column 1-12, the tilting oil cylinder 1-13 of the door taking machine, the suspension bracket 1-14, the small furnace door 2-1, the small furnace door opening machine 2-2, the coal leveling rod 2-3, the surplus coal chute 2-4, the detector 2-5 of the small furnace door, the proximity switch 2-6 of the small furnace door, the small furnace door hook 2-7, and the surplus coal chute sensor 2-8. Detailed implementation manners

[0016] In order to enable those skilled in the art to better understand the technical solutions in this patent, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Embodiment 1

[0017] A safety action protection device for a coke pusher includes a cross iron detection assembly of the door frame and a small furnace door opening detection assembly. The cross iron detection assembly of the door frame includes the cross iron 1-10 of the door frame for fixing the furnace door, the cross iron detector 1-6 located at the bottom of any end of the cross iron 1-10 of the door frame, the proximity switch 1-7 of the cross iron of the door frame for detecting whether the cross iron 1-10 of the door frame is opened or closed in place, and a bolt opening and closing sensor. A suspension bracket 1-14 is provided outside the furnace door. At the bottom of the lowest point of the descent of the cross iron 1-10 of the door frame on the side of the suspension bracket 1-14, a cross iron detector 1-6 is installed, and a proximity switch 1-7 of the cross iron of the door frame is provided at the position after the cross iron detector 1-6 is restored. One end of the cross iron detector 1-6 is in contact with the bottom of the cross iron 1-10 of the door frame. After the cross iron 1-10 of the door frame is installed, the other end of the cross iron detector 1-6 touches the proximity switch 1-7 of the cross iron of the door frame after the suspension bracket 1-13 retreats; the small furnace door opening detection assembly includes a surplus coal chute 2-4 for receiving the surplus coal during the leveling of the coal when the small furnace door 2-1 is opened, a small furnace door detector 2-5 provided at the bottom of the surplus coal chute 2-4, and a proximity switch 2-6 of the small furnace door. When the small furnace door 2-1 is in the open state, one end of the furnace door detector 2-5 touches the proximity switch 2-6 of the small furnace door, and the other end touches the surplus coal chute sensor 2-8 at the bottom of the surplus coal chute 2-4. The proximity switch 1-7 of the cross iron of the door frame, the bolt opening and closing sensor, the proximity switch 2-6 of the small furnace door, and the surplus coal chute sensor 2-8 are respectively electrically connected to the safety action protection system of the coke pusher.

[0018] Further, the cross-iron detection component 1-6 includes a first connecting rod and a second connecting rod. One end of the first connecting rod contacts the bottom of the cross-iron, and the other end of the first connecting rod is connected to one end of the second connecting rod through a rotating shaft on the suspension bracket 1-14. The other end of the second connecting rod touches the cross-iron proximity switch 1-7 of the door frame.

[0019] Further, the small furnace door detection component 2-5 is V-shaped. The bottom of the V-shape is connected to the bottom of the residual coal chute. One corner of the V-shape touches the small furnace door proximity switch and the chute sensor fixed to the bottom of the residual coal chute when the small furnace door is opened. After the small furnace door is closed, the bottom of the residual coal chute 2-4 moves upward, and the other corner of the V-shape touches the small furnace door proximity switch 2-6.

[0020] Further, the safety action protection system of the coke pusher includes a sub-station PLC, a main-station PLC, and a host computer. One end of the sub-station PLC is electrically connected to the host computer through the main-station PLC. The sub-station PLC includes a DI module, and the DI module is electrically connected to the cross-iron proximity switch 1-7 of the door frame, the small furnace door proximity switch 2-6, the bolt opening and closing sensor, and the residual coal chute sensor 2-8 respectively.

[0021] Preferably, the fireproof wires, wire pipes, and sleeves used by the cross-iron proximity switch 1-7 of the door frame, the small furnace door proximity switch 2-6, the bolt opening and closing sensor, and the residual coal chute sensor 2-8 and the junction box are all made of fireproof materials.

[0022] Preferably, the PLC, the host computer, the cross-iron proximity switch 1-7 of the door frame, the small furnace door proximity switch 2-6, the bolt opening and closing sensor, and the residual coal chute sensor 2-8 all adopt existing general models. Embodiment 2

[0023] The safety action protection method of the coke pusher in this embodiment includes the following steps: The door frame horizontal iron detection device: the door taking machine is used to lock the fixed furnace door, take out the furnace door and transfer it to the position of cleaning the furnace door, and then put the furnace door back; the coke pushing car is aligned in advance to perform the coke pushing procedure, and the door taking machine performs the door picking work to reach the specified position, and the door lifting cylinder is guided in the rotating frame 1-1 by the guide frame device, driving the sliding arm 1-4 to move upward, so that the upper door hook 1-3 and the lower door hook 1-5 are hung on the furnace door column 1-12, the door pressing cylinder 1-11 is actuated to press the door, and the door latch cylinder 1-9 is actuated to lift the door frame horizontal iron 1-10. The door frame horizontal iron detection part 1-6 is installed at the closed position of the upper and lower door frame horizontal irons 1-10 of the door taking machine, and is composed of two ends and a shaft. The shaft serves as a rotating pair of the mechanism, and one end can return to its original position by its own weight. When the door-taking machine is lifting the door, one end of the door frame horizontal iron detection piece 1-6 is upward due to the sliding arm 1-4, and the position just touches one end of the horizontal iron, so that the other end of the door frame horizontal iron detection piece 1-6 is tilted to the specified position to be sensed by the door frame horizontal iron proximity switch 1-7. The signal of the non-electrically-contacted door frame horizontal iron proximity switch 1-7 is transmitted to the DI module in the PLC, and the "I" point of the DI module is set as the interlocking condition for pressing the door bolt to retreat. The value of the door bolt opening and closing sensor (inside the door bolt cylinder) and the non-electrically-contacted proximity switch of the door frame horizontal iron detection piece 1-6 are in a "and" logical relationship. The door bolt cylinder 1-9 acts to lift the door frame horizontal iron 1-10, and the door frame horizontal iron detection piece 1-6 will return to its original position by its own gravity without force. The door lifting cylinder 1-2 drives the sliding frame to continue to move upward in the suspension frame, and the door-taking machine tilting cylinder 1-13 is started, driving the furnace door to tilt backward and retreat, completing the door taking.

[0024] The purpose of the safety interlock is the door installation process, and the door installation steps are opposite to the door removal process. When the steps proceed to closing the door frame cross iron 1-10, the door latch oil cylinder 1-9 falls, the door latch opening and closing sensor induction gives a value, the cross iron falls into the furnace door balance slot 1-8, and the cross iron relies on the falling gravity to press the door frame cross iron detection part 1-6 to the induction switch again, and the door frame cross iron proximity switch 1-7 outputs a signal to install the next step. When the door frame cross iron detection part 1-6 is not in place and the door frame cross iron proximity switch 1-7 cannot send a signal, or the opener and closer sensor has no signal, it proves that the door frame cross iron 1-10 is not in place, triggering the interlock pressure door latch will not be able to retreat to prevent the furnace door from falling, and the door removal mechanism starts to alarm and needs to be manually confirmed before the door installation action can continue.

[0025] Taking into account the thermal expansion and contraction of the furnace body and the temperature of the furnace door, the fireproof wires, wire tubes and casings used in proximity switches and junction boxes will all be made of fire-resistant materials.

[0026] The small furnace door opening detection device: When the coal leveling operation is carried out, first, the small furnace door opener 2-2 descends to the opening position, and then the small furnace door hook 2-7 advances to open the small furnace door 2-1. The small furnace door detector 2-5 and the small furnace door proximity switch 2-6 are installed under the surplus coal chute 2-4. The shape of the small furnace door detector 2-5 is V-shaped and is directly fixed on the surplus coal chute 2-4. The small furnace door proximity switch 2-6 is installed at two lifting points of the surplus coal chute 2-4. When the surplus coal chute 2-4 rotates downward, the small furnace door detector 2-5 rotates at the same angle as the surplus coal chute 2-4. When the surplus coal chute 2-4 advances in place, the two corners of the V-shape of the small furnace door detector 2-5 simultaneously contact the small furnace door proximity switch 2-6 and the surplus coal chute sensor 2-8. The signal of the non-contact small furnace door proximity switch 2-6 is transmitted to the PLC DI module, and the "I" point of the DI module is set as the interlock condition for the forward movement of the coal leveling rod. The value of the surplus coal chute sensor 2-8 of the coal leveling and the non-contact small furnace door proximity switch 2-6 of the inspection mechanism are in a logical relationship of "AND". When the surplus coal chute 2-4 is not in place and cannot make the small furnace door detector 2-5 reach the specified position, the small furnace door proximity switch 2-6 cannot output a signal. After the small furnace door detector 2-5 triggers the small furnace door proximity switch 2-6 and the value of the surplus coal chute sensor 2-8 meet simultaneously after movement, the coal leveling rod 2-3 can move. Otherwise, the coal leveling rod 2-3 does not move and alarms, and manual intervention and inspection are required before continuing to move. If the coal leveling rod is retracted after the coal leveling is completed and the surplus coal chute 2-4 rises and rotates, the detection mechanism also makes the same angle. When one corner of the V-shape reaches the specified position sensed by the small furnace door proximity switch 2-6 and one corner leaves the other proximity switch (the numerical switch of the surplus coal chute sensor), the small furnace door 2-1 is closed after the signal is output. When the coal leveling rod 2-3 is not retracted or the surplus coal chute 2-4 is not lifted, the remaining steps cannot be carried out.

[0027] The above method will install a detection mechanism for the door taking and coal leveling processes, and install an automatic operation insurance measure without changing the basic equipment, so that it can be executed more stably and safely during fully automatic unattended operation.

[0028] The structure of the present invention is simple, with high safety performance, small investment, and simple operation. Through the coordinated cooperation of the control switch and the mechanism, it effectively solves the situation where the small furnace door opens and the furnace door cross iron is not in place, and reduces the operation risk.

Claims

1. A safety action protection device for a coke pusher, comprising a cross iron detection component of the door frame and a small furnace door opening detection component. The cross iron detection component of the door frame includes a cross iron for fixing the furnace door, a cross iron detection piece located at the bottom of any end of the cross iron, a cross iron proximity switch for detecting whether the cross iron of the door frame is in place for opening and closing, and a latch opening and closing sensor. A suspension bracket is provided outside the furnace door. A cross iron detection piece is installed at the bottom of the lowest point of the cross iron of the door frame on the side of the suspension bracket, and a cross iron proximity switch is provided at the position after the cross iron detection piece is restored. One end of the cross iron detection piece contacts the bottom of the cross iron. After the cross iron is installed and the suspension bracket retreats, the other end of the cross iron detection piece touches the cross iron proximity switch. The small furnace door opening detection component includes a coal chute for receiving the remaining coal during the opening of the small furnace door, a small furnace door detection piece provided at the bottom of the coal chute, and a small furnace door proximity switch. When the small furnace door is in the open state, one end of the furnace door detection piece touches the small furnace door proximity switch, and the other end touches the coal chute sensor at the bottom of the coal chute. The cross iron proximity switch, the latch opening and closing sensor, the small furnace door proximity switch, and the coal chute sensor are respectively electrically connected to the safety action protection system of the coke pusher.

2. The coke pushing car safety action protection device according to claim 1, wherein, The cross iron detection piece includes a first connecting rod and a second connecting rod. One end of the first connecting rod contacts the bottom of the cross iron. The other end of the first connecting rod is connected to one end of the second connecting rod through a rotating shaft on the suspension bracket. The other end of the second connecting rod touches the cross iron proximity switch.

3. The coke pusher safety action protection device according to claim 1, characterized in that, The small furnace door detection piece is in a V shape. The bottom of the V shape is connected to the bottom of the coal chute. One corner of the V shape touches the small furnace door proximity switch and the chute sensor fixed to the bottom of the coal chute when the small furnace door is opened. After the small furnace door is closed, the bottom of the coal chute moves upward, and the other corner of the V shape touches the small furnace door proximity switch.

4. The coke pushing vehicle safety action protection device according to claim 1, characterized in that, The safety action protection system of the coke pusher includes a sub-station PLC, a main-station PLC, and a host computer. One end of the sub-station PLC is electrically connected to the host computer through the main-station PLC. The sub-station PLC includes a DI module, and the DI module is respectively electrically connected to the cross iron proximity switch, the small furnace door proximity switch, the latch opening and closing sensor, and the coal chute sensor.

5. The coke pusher safety action protection device according to claim 1, characterized in that, The fireproof wires, conduits, and sleeves used by the cross iron proximity switch, the small furnace door proximity switch, the latch opening and closing sensor, and the coal chute sensor and the junction box are all made of fireproof materials.

6. A coke pusher safety operation protection method using the device described in any one of claims 1 to 4, characterized in that, Including the following steps: The coke pushing car is aligned in advance to carry out the coke pushing procedure, the door taking machine carries out the door taking work and arrives at the designated position, the door lifting cylinder is guided in the rotary frame by the guide frame device, drives the sliding arm to move upward, and the upper door hook and the lower door hook are hung on the furnace door column, the door pressing cylinder moves to press the door, and the door latch cylinder moves to lift the door frame cross iron; when the door taking machine carries out the door lifting, one end of the door frame cross iron detection piece is in contact with one end of the cross iron due to the upward sliding arm, so that the other end of the door frame cross iron detection piece is tilted to the designated position to make the door frame cross iron approach the switch induction; The signal from the door frame horizontal iron proximity switch is transmitted to the DI module in the PLC, and the "I" point of the DI module is set as the interlocking condition for pressing the door bolt to retreat. When the value of the door bolt opening and closing sensor and the door frame horizontal iron proximity switch simultaneously meet the door frame horizontal iron opening condition, the door bolt cylinder is actuated to lift the door frame horizontal iron. The door frame horizontal iron detection part will return to its original position by its own gravity without force. The door lifting cylinder drives the sliding frame to continue to move upward in the hanging frame, and the door taking machine tilting cylinder is started, driving the furnace door to tilt backward and retreat, completing the door taking. The steps of door installation are opposite to the process of door removal. When the steps reach the stage of closing the door frame cross iron, the door latch oil cylinder falls, the door latch opening and closing sensor senses and gives a value, the cross iron falls into the balance slot of the furnace door, and the cross iron relies on the falling gravity to press the door frame cross iron detection piece again to the door frame cross iron proximity switch, and the door frame cross iron proximity switch outputs a signal to install the next step. When the door frame cross iron detection piece is not in place and cannot make the door frame cross iron proximity switch send a signal, or the door frame opener and closer sensor has no signal, it proves that the door frame cross iron is not in place, triggering the interlock pressure door latch will not be able to retreat to prevent the furnace door from falling, and the door removal mechanism starts to alarm and needs manual confirmation before continuing the door installation action; The small furnace door opening detection device: when the coal leveling action is in progress, the small furnace door opener first descends to the door opening position, and then the small furnace door hook moves forward to open the small furnace door. When the residual coal chute is falling and rotating, the small furnace door detection member rotates at the same angle as the residual coal chute. When the residual coal chute moves into place, the two V-shaped corners of the small furnace door detection member simultaneously contact the small furnace door proximity switch and the residual coal chute sensor. One corner reaches the designated position sensed by the small furnace door proximity switch, and the other corner leaves the residual coal chute sensor. The signal from the small furnace door proximity switch is transmitted to the PLC. DI module, set the "I" point of the DI module as the interlocking condition for the advancement of the flat coal rod. When the residual coal chute is not in place and the small furnace door detection component cannot reach the specified position, the small furnace door proximity switch cannot output a signal. The small furnace door detection component triggers the small furnace door proximity switch and the residual coal chute sensor moves. The two numerical points are met at the same time, and the flat coal rod can move. Otherwise, the flat coal rod will not move and an alarm will be issued, requiring manual intervention and inspection before it can continue to move; if the flat coal rod is retracted after the coal is flattened, the residual coal chute rises and rotates, and the small furnace door detection component also makes the same angle, one corner of the V-shaped small furnace door detection component reaches the specified position sensed by the small furnace door proximity switch, and the other corner leaves until the residual coal chute sensor outputs a signal to close the small furnace door. When the flat coal rod is not retracted or the residual coal chute is not lifted, the remaining steps cannot be performed.

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