A method of operating a door closer

Abstract

This invention discloses a door knife operating method. When the elevator car is stopped at a safe height from the landing position but not at the landing door position: when the elevator falls, the elevator safety brake will brake the elevator, the door knife will move down and the door ball will contact the door. In the power-on state, the door operator motor drives the door knife to open the car door lock, and the car door will open. In the power-off state, the door can be pried open from inside the car, the door knife will open the car door lock, and the car door and landing door will open.

Description

Technical Field

[0001] This invention relates to the field of elevator manufacturing, and more specifically to a door knife working method. Background Technology

[0002] An elevator door operator is a mechanism responsible for opening and closing elevator hall and car doors. When it receives an elevator opening or closing signal, the door operator, through its built-in control system, controls the door opening motor, converting the torque generated by the motor into a force in a specific direction to close or open the door. When the force preventing the door from closing exceeds a certain value (n), the door operator automatically stops closing the door and opens it in the opposite direction, providing a certain degree of door-closing protection. To reduce elevator accidents, elevator door operators are often equipped with anti-pry door components. Elevator manufacturers typically include door opening stoppers and mechanical locking hooks to prevent the door from being opened outside the leveling area, thus preventing passengers from maliciously prying open the door and falling out. During an elevator fall, due to the anti-fall components, the elevator often stops outside the leveling area. However, in the event of an accident, at a suitable drop point—that is, when the difference between the elevator car floor and the leveling threshold is small—if the car door and landing door can be pried open in the event of a malfunction, passengers inside can quickly rescue themselves, reducing rescue time and preventing secondary accidents. Summary of the Invention

[0003] The purpose of this invention is to overcome the above-mentioned deficiencies in the prior art and to provide a door knife operation method after the elevator has stopped due to a malfunction at the safe exit height of the car.

[0004] The technical solution adopted by this invention to solve the above problems is: a door knife working method, after the elevator malfunctions and falls, and the elevator safety brake brakes the elevator to an emergency stop, including the following three operating modes:

[0005] S1: When the elevator car is stopped at the landing door position: the door knife body contacts the door ball. When the power is on, the door operator motor drives the door knife to open the car door lock, and the car door opens. When the power is off, the door is pried open from inside the car, the door knife opens the car door lock, and the car door and landing door open.

[0006] S2: When the elevator car is not at the landing door position but the car is at a non-safe height from the landing position: the door knife body does not contact the door ball and the car door cannot be opened;

[0007] S3: When the elevator car is not at the landing door position but the car and the landing position are at a safe height: When the elevator falls, the elevator safety brake will brake the elevator, the door knife will descend and the door ball will contact the door. In the power-on state, the door operator motor will drive the door knife to open the car door lock, and the car door will open. In the power-off state, the door will be pried open from inside the car, the door knife will open the car door lock, and the car door and landing door will open. The maximum travel of the door knife descent is less than or equal to the safe height.

[0008] Furthermore: In S3, the door operator plate is installed on the car, and both ends of the mounting plate are fixed to the outermost slide rail of the sliding device. The door knife holder is provided with a first connecting shaft and a second connecting shaft. The car door hanging plate is slidably mounted on the door operator plate. The mounting plate is provided with a first horizontal sliding groove, and the car door hanging plate is provided with a second vertical sliding groove. The first connecting shaft is adapted to slide within the first sliding groove, and the second connecting shaft is adapted to slide on the second sliding groove. The sliding device is provided with a first drive lock and a hook arm. The hook arm is hinged to the arm groove of the outermost slide rail and connected to a torsion spring for reset. The initial position is set within the arm groove, and the reset position is the same as the initial position. The initial position is 90°, and the initial position is locked by the second drive lock. The reset position is locked by the third drive lock. A hook ring adapted to the hook arm is set at the front end of the car. When the elevator falls, the elevator safety brake will brake the elevator. At this time, the first drive lock is unlocked, the door knife falls with the mounting plate, the second drive lock is unlocked, the hook arm resets and contacts the groove, and is locked by the third drive lock. At this time, the door knife body contacts the door ball. In the power-on state, the door operator motor drives the door knife to open the car door lock, and the car door opens. In the power-off state, the door is pried open from inside the car, the door knife opens the car door lock, and the car door and landing door open. The maximum sliding stroke of the sliding device is less than or equal to the safe height.

[0009] Furthermore: When the elevator malfunctions and falls, the first drive lock is unlocked. The sliding device is equipped with a secondary unlocker. When the elevator stops falling due to the safety clamp action, the secondary unlocker is unlocked. At this time, the sliding device slides down, the second drive lock is unlocked, and the hook arm and hook ring engage.

[0010] Furthermore: The sliding device adopts a three-section sliding rail, and the first drive lock unlocking includes a first sleeve, a second sleeve, and a third sleeve. The first sleeve, the second sleeve, and the third sleeve are slidably connected in sequence. The cavities of the first sleeve, the second sleeve, and the third sleeve are connected and equipped with a reset spring. One end of the traction cable is connected to the first sleeve, and the traction cable is fixed to the elevator speed limiting rope at its fixed end via several guide wheels.

[0011] Furthermore: the sliding device is adapted to be provided with a backstop mechanism between adjacent slide rail components, and the backstop direction is upward backstop. The backstop mechanism includes a backstop hook and a backstop tooth. The backstop hook is hinged to the outer slide rail component, and a number of backstop teeth are arranged on the adjacent inner slide rail components.

[0012] Furthermore: the sliding device includes a first slide rail, a second slide rail, and a third slide rail. The first slide rail and the second slide rail are respectively provided with pulley grooves. The second slide rail and the third slide rail are provided with rubber pulleys at the matching positions to adapt to the pulley grooves and form damped sliding.

[0013] Furthermore: the secondary unlocking device includes a fixed base, rollers, pressure rollers, a fixing belt, guide wheels, a fixing device, and a fixing cable. The rollers, pressure rollers, and guide wheels are rotatably mounted on the fixed base. The rollers and pressure rollers are opposite each other and adapted to the elevator speed-limiting rope. The pressure rollers have protrusions that adapt to the two sides of the guide wheel. The pressure rollers are equipped with torsion springs to initially detach from the guide wheel surface. The fixing cable is fixed to the fixing device via the guide wheel groove. The fixing belt is fixed to the fixing device via the two sides of the guide wheel. The fixing device is fixed to the elevator speed-limiting rope at the corresponding position. The fixed base is fixed to the car. The second drive lock is L-shaped, with one end fixed to the head end of the secondary slide rail component, and the other end inserted into the slide rail component at the head end and longitudinally slidingly inserted and adapted to the hook arm in its initial position. The fixing belt is fixed to the outermost slide rail component via a first connecting cable, and the fixing cable is fixed to the traction cable via a second connecting cable.

[0014] Furthermore: the fixing strap and fixing cable are fixed on the elastic clips on the fixing device.

[0015] Furthermore, the fixing strap and fixing cable are elastic.

[0016] Furthermore: the first sleeve is positioned at the bottom of the cavity of the second sleeve and magnetically attracted, and the second sleeve is positioned at the bottom of the cavity of the third sleeve and magnetically attracted.

[0017] Compared with the prior art, this invention has the following advantages and effects: When applied to an elevator door operator, after the elevator malfunctions and the safety clamp stops the descent, the first locking mechanism unlocks, the sliding device slides down, and the second locking mechanism unlocks. A hook ring is provided at the elevator's adaptive position to engage with the hook arm, allowing the hook arm to engage with the hook ring. After the elevator stops completely, the hook arm descends, and the engaged hook ring lowers the door knife to contact the door ball, which can be considered as being at the landing door position. This allows for timely exit of the elevator car when it is not at the landing door position but is at a safe height from the landing position, providing a self-rescue scenario, reducing rescue time, and preventing secondary accidents. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the gate operator setup according to an embodiment of the present invention.

[0019] Figure 2 This is a schematic diagram of the sliding device according to an embodiment of the present invention.

[0020] Figure 3 This is a schematic diagram of the hook arm arrangement in the sliding device according to an embodiment of the present invention.

[0021] Figure 4 This is a schematic diagram of the structure of the sliding device in an embodiment of the present invention, showing the arrangement of the support plate.

[0022] Figure 5 This is a schematic diagram of the pulley groove arrangement in the sliding device according to an embodiment of the present invention.

[0023] Figure 6 This is a schematic diagram of the structure of the secondary unlocker according to an embodiment of the present invention.

[0024] Figure 7 This is a schematic diagram of the anti-reverse mechanism according to an embodiment of the present invention.

[0025] Figure 8 This is a schematic diagram of the structure of the hook arm and hook ring in an embodiment of the present invention.

[0026] Figure 9 This is a schematic diagram of the connection structure between the multi-section guide rail and the shaft connecting plate in an embodiment of the present invention.

[0027] Figure Numbers: Sliding Device 100, Door Operator Plate 101, Hook Arm 102, Arm Groove 103, Torsion Spring 104, Door Knife 105, First Sleeve 106, Second Sleeve 107, Third Sleeve 108, Return Spring 109, Traction Cable 110, Elevator Speed ​​Limiting Rope 111 First slide rail component 112, second slide rail component 113, third slide rail component 114, pulley groove 115, rubber pulley 116, reverse hook 117, anti-reverse tooth 118, fixing seat 119, roller 120, pressure wheel 121, protrusion 1211, fixing belt 122, guide wheel 123, fixing device 124, fixing cable 125, elastic clip 126, support plate 127, second drive lock 128, third drive lock 129, speed limiter rope 130, hook ring 131, sliding plate 132, multi-section guide rail component 133, door knife holder 134, first sliding groove 136, second sliding groove 137, mounting plate 138, belt 139, car door hanging plate 140. Detailed Implementation

[0028] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. The following embodiments are explanations of the present invention, but the present invention is not limited to the following embodiments.

[0029] See Figures 1-8 This embodiment describes a door knife 105 operating method. After the elevator malfunctions and falls, and the elevator safety brake brakes the elevator to an emergency stop, the method includes the following three operating modes:

[0030] S1: When the elevator car is stopped at the landing door position: the blade of the door knife 105 contacts the door ball. When the power is on, the door operator motor drives the door knife 105 to open the car door lock and the car door opens. When the power is off, the door is pried open from inside the car and the door knife 105 opens the car door lock and the car door and landing door open.

[0031] S2: When the elevator car is not at the landing door position but the car is at a non-safe height from the landing position: the door knife 105 does not contact the door ball and cannot open the car door;

[0032] S3: When the elevator car is not stopped at the landing door position but the car and the landing position are at a safe height: When the elevator falls, the elevator safety brake will brake the elevator, the door knife 105 will descend and the door ball will contact. In the power-on state, the door operator motor will drive the door knife 105 to open the car door lock, and the car door will open. In the power-off state, the door will be pried open from inside the car, the door knife 105 will open the car door lock, and the car door and landing door will open. The maximum descent stroke of the door knife 105 is less than or equal to the safe height.

[0033] In this embodiment, the door knife 105 should be able to pry open the door from the inside when it is stopped at the landing door position, but it cannot pry open the door from the inside when it is not at the landing door position. Specifically, the applicant disclosed a door knife 105 linkage device in Chinese Patent Publication No.: CN111717767B, which is applied to the structure of this door knife 105. That is, if the car is in the unlocking area, the door knife 105 is in the open state. When the door operator is energized or de-energized, and a person inside the car tries to open the door, because the center line of the main tension spring is below the center of the rotating arm shaft, the left and right blades of door knife 105 will not retract. As the car door is opened, the lock hook will contact the moving plate. After the lock hook secures the moving plate and moves a certain distance to the left, the right blade will contact the landing ball. Under this resistance, it will continue to move, and the rotating arm will rotate clockwise under the action of the right blade. The power shaft triggers and drives the lever to rotate counterclockwise. The lever cooperates with the lock hook wheel to lift the lock hook, and the lock pin and lock hole are in a disengaged state, realizing the normal unlocking of the car door lock hook. However, if the car is outside the unlocking area at this time, when the left and right blades retract without touching the landing ball, the left and right blades continue to retract without resistance, while the power plate continues to swing counterclockwise to the limit under the force of the door operator. At this time, the first and second drive shafts are not along the power The first and second moving parts on the plate are in normal cooperation with the lock hook wheel, and the lock hook does not lift. At this time, the lock pin and the lock hole are in a meshing state. Under the action of the door operator, the door knife 105 moves to the left as a whole. The lock hook will contact the moving plate. Due to the action of the elastic component, the lock hook will hook the moving plate and move to the left a certain distance until the lock hook and the moving plate coincide with the lock groove wall of the lock hook plate. The door knife 105 will not be able to continue to move to the left, so that the door lock hook cannot be unlocked outside the unlocking area. During this movement, the lock pin and the lock hole are in a meshing state, so that the door lock hook cannot be unlocked outside the unlocking area. That is, the above structure can realize the functions of S1 and S2. At the same time, in the operation of S3, the door knife 105 is lowered to contact the door ball by the above method, which can be regarded as the landing door position, so the function of S3 can be realized.

[0034] Specifically, in S3, the door operator plate 101 is installed on the car, and the mounting plate 138 is fixed at both ends to the outermost slide rail of the sliding device 100. The door knife 105 frame 134 is provided with a first connecting shaft and a second connecting shaft. The car door hanging plate 140 is slidably mounted on the door operator plate 101. The mounting plate 138 is provided with a transverse first sliding groove 136, and the car door hanging plate is provided with a longitudinal second sliding groove 137. The first connecting shaft is adapted to slide in the first sliding groove, and the second connecting shaft is adapted to slide in the second sliding groove. The sliding device 100 is provided with a first drive lock and a hook arm 102. The hook arm 102 is hinged in the arm groove 103 of the outermost slide rail and connected to a torsion spring 104 for reset. The initial position is set in the arm groove. Inside, the reset position is 90° from the initial position. The initial position is locked by the second drive lock 128, and the reset position is locked by the third drive lock 129. A hook ring 131 adapted to the hook arm 102 is provided at the front end of the car. When the elevator falls, the elevator safety brake will brake the elevator. At this time, the first drive lock is unlocked, the door knife 105 falls with the mounting plate, the second drive lock 128 is unlocked, the hook arm 102 resets and contacts the groove, and is locked by the third drive lock 129. At this time, the blade of the door knife 105 contacts the door ball. In the power-on state, the door operator motor drives the door knife 105 to open the car door lock, and the car door opens. In the power-off state, the door is pried open from inside the car, the door knife opens the car door lock, and the car door and landing door open. The maximum sliding stroke of the sliding device is less than or equal to the safe height. In this embodiment, a sliding device 100 is used to set the door operator plate 101. After the elevator falls, the safety clamp works to brake the elevator. At this time, the first drive lock is opened to unlock, the second drive lock 128 is unlocked, the door knife 105 falls, and the hook arm 102 is reset at the same time. The hook arm 102 is locked by the third drive lock 129. At this time, the hook arm 102 is connected and fastened to the hook ring 131. The installation position of the hook ring is the position where the door knife 105 adapts to the door ball after falling.

[0035] In this embodiment, under the power-on state and driven by the door operator motor, the power shaft of the door knife 105 needs to be connected to the belt 139 to drive the door knife 105 to unlock and slide. The belt 139 is fixedly connected to the sliding plate 132 and is laterally slidably mounted on the door operator plate 101. The door knife holder 134 is connected by a multi-section guide rail 133 on one side. The connecting seat of the multi-section guide rail 133 is fixed to the sliding plate 132. The guide rail at the end of the multi-section guide rail 133 is connected to the connecting shaft plate 141 (which has a shaft hole 142 that is compatible with the power shaft). After the door knife falls with the mounting plate, the multi-section guide rail is stretched as it falls because the shaft plate is connected to the power shaft. When powered on, the belt drives the sliding plate to slide. Due to the connection of the multi-section guide rail, the shaft plate drives the power shaft to move, thus unlocking the door knife 105. This allows the door knife 105 to still be electrically driven by the belt 139 after it falls.

[0036] Specifically, when the elevator malfunctions and falls, the first drive lock is unlocked. The sliding device 100 is equipped with a secondary unlocker. When the elevator stops falling due to the safety brake action, the secondary unlocker is unlocked. At this time, the sliding device 100 slides down, and the second drive lock 128 is unlocked, allowing the hook arm 102 to engage with the hook ring. This allows the elevator to fall after it has completely stopped. Since the minimum braking distance of the elevator safety brake is about 5 meters, if the hook arm 102 falls before it has fully braked, it is easy for the hook arm 102 to break. Therefore, after the elevator stops, the secondary unlocker is unlocked, and the sliding device 100 is unlocked and slides down.

[0037] Specifically, in this invention, the sliding device 100 adopts a three-section sliding rail, and the first drive lock unlocking includes a first sleeve 106, a second sleeve 107, and a third sleeve 108. The first sleeve 106, the second sleeve 107, and the third sleeve 108 are sequentially slidably sleeved together. The cavities of the first sleeve 106, the second sleeve 107, and the third sleeve 108 are connected and equipped with a return spring 109. One end of the traction cable 110 is connected to the first sleeve 106, and the traction cable 110 is connected to the elevator speed limiting rope via several guide wheels 123. Fixed at its fixed end, after the elevator falls, because the elevator speed limiting rope stops, the traction cable 110 pulls the first sleeve 106 and the second sleeve 107 to retract in sequence, thereby unlocking the three-section sliding rail. Specifically, the sliding device includes a first slide rail component 112, a second slide rail component 113, and a third slide rail component 114. The first slide rail component 112 and the second slide rail component 113 are respectively provided with pulley grooves 115. The second slide rail component 113 and the third slide rail component 114 are provided with rubber pulleys 116 at the matching positions. The groove 115 is adapted to form a damped sliding mechanism. The first drive lock helps to make the sliding rail connection of the sliding device 100 more stable and less prone to deviation under normal operating conditions. The adjacent sliding rail components of the sliding device are adapted to have a backstop mechanism, which is upward backstop. The backstop mechanism includes a backstop hook 117 and a backstop tooth 118. The backstop hook 117 is hinged to the outer sliding rail component, and several backstop teeth 118 are arranged on the adjacent inner sliding rail components. Therefore, when the sliding rail components of the sliding device 100 slide... Upon reaching the bottom, the hook arm 102 contacts the hook ring. As the elevator car descends under its own weight, the hook arm 102 and hook ring work together. Due to the anti-reverse mechanism, the various slide rail components cannot be reset, providing good support for the car. Since the hook arm 102 and hook ring only engage at the appropriate position outside the car, after the car stops and is braked by the safety clamp, the hook arm 102 and hook ring work together for secondary support, providing additional auxiliary support to the car and improving its safety to a certain extent, reducing the occurrence of secondary accidents.

[0038] In this embodiment, the auxiliary unlocking device includes a fixed base 119, a roller 120, a pressure roller 121, a fixing belt 122, a guide wheel 123, a fixing device 124, and a fixing cable 125. The roller 120, pressure roller 121, and guide wheel 123 are rotatably mounted on the fixed base 119. The roller 120 and pressure roller 121 are opposite to each other and adapted to be mounted on the elevator speed limiting rope. The pressure roller 121 is provided with a protrusion 1211 that is adapted to the two wheel surfaces of the guide wheel 123. The pressure roller 121 is provided with a torsion spring 104 so that it is initially disengaged from the wheel surface of the guide wheel 123. The fixing cable 125 is fixed to the fixing device 124 via the wheel groove of the guide wheel 123. The belt 122 is fixed to the fixing device 124 via the two wheel surfaces of the guide wheel 123. The fixing device 124 is fixed to the elevator speed limiting rope at the corresponding position. The fixing seat 119 is fixed to the car. The second drive lock 128 is L-shaped, with one end fixed to the head end of the secondary slide rail (second slide rail 113), and the other end inserted into the slide rail at the head end and longitudinally slidingly inserted and adapted to the hook arm 102 in its initial position. The fixing belt 122 is fixed to the outermost slide rail (first slide rail 112) via the first connecting cable. The fixing cable 125 is fixed to the traction cable 110 via the second connecting cable. The lower end of the outermost slide rail (first slide rail 112) is provided with a support plate 127 for... During the operation of the elevator, which is supported by the second slide rail component (113) at the limit end, the elevator descends, the elevator speed governor activates, and the elevator speed governor rope stops running. At this time, the elevator safety brake activates, and the elevator car decelerates. During this process, the second connecting cable connects to the traction cable 110. As the car descends, the first sleeve 106 and the second sleeve 107 retract, thus unlocking the slide rail of the sliding device 100. After unlocking, as the elevator continues to descend, the fixing cable 125 disengages beyond the preload of the fixing device 124. Similarly, the fixing belt 122 also disengages beyond the preload. Since the roller 120 and the pressure roller 121 rotate during the elevator descent, before disengagement, the pressure roller 120... The protrusion 1211 of 1 will fit against the wheel surface of the guide wheel 123, so that the fixing belt 122 will not completely detach. At this time, the first connecting cable will still pull the outermost slide rail (first slide rail 112), and due to the limitation of the support plate 127, the second slide rail (second slide rail 113) will not fall. When the elevator is fully braked and the roller 120 stops rolling, the pressure wheel 121 will reset under the action of the torsion spring, the fixing belt 122 will disengage from the clamp, and the outermost slide rail (first slide rail 112) will fall. At this time, the hook arm 102 will disengage from the restriction of the second drive lock 128 and reset to cooperate with the hook ring. Therefore, this structure can lower the mounting plate after the elevator has been fully braked and stopped, making the structure more stable.

[0039] In this embodiment, the fixing strap 122 and fixing cable 125 are fixed on the elastic clip 126 on the fixing device 124. The fixing strap 122 and fixing cable 125 are elastic, providing a margin of motion for the elevator speed limiting rope to synchronize with the elevator car during operation, thus ensuring the stability of the structure. In this embodiment, the first sleeve 106 is limited and magnetically attracted at the bottom of the cavity of the second sleeve 107, and the second sleeve 107 is limited and magnetically attracted at the bottom of the cavity of the third sleeve 108, so that after contact, the adsorption will not be reset due to the action of the spring.

[0040] The above description is merely illustrative of the invention. Those skilled in the art can make various modifications or additions to the described specific embodiments or use similar methods to replace them, as long as they do not depart from the content of this specification or exceed the scope defined by the claims, all of which should fall within the protection scope of this invention.

Claims

1. A method for operating a door knife, characterized in that: If an elevator malfunctions and falls, the elevator safety brake will stop the elevator. After the elevator comes to an emergency stop, there are three possible operating modes: S1: When the elevator car is stopped at the landing door position: the door knife body contacts the door ball. When the power is on, the door operator motor drives the door knife to open the car door lock, and the car door opens. When the power is off, the door is pried open from inside the car, the door knife opens the car door lock, and the car door and landing door open. S2: When the elevator car is not at the landing door position but the car is at a non-safe height from the landing position: the door knife body does not contact the door ball and the car door cannot be opened; S3: When the elevator car is not stopped at the landing door position but the car and the landing position are at a safe height: When the elevator falls, the elevator safety brake will brake the elevator, the door knife will descend and the door ball will contact the door. In the power-on state, the door operator motor will drive the door knife to open the car door lock, and the car door will open. In the power-off state, the door can be pried open from inside the car, the door knife will open the car door lock, and the car door and landing door will open. The maximum travel of the door knife descent is less than or equal to the safe height. In S3, the door operator plate is installed on the car. Both ends of the mounting plate are fixed to the outermost slide rail of the sliding device. The door knife holder is equipped with a first connecting shaft and a second connecting shaft. The car door hanging plate is slidably mounted on the door operator plate. The mounting plate has a first horizontal sliding groove, and the car door hanging plate has a second vertical sliding groove. The first connecting shaft slides within the first sliding groove, and the second connecting shaft slides on the second sliding groove. The sliding device is equipped with a first drive lock and a hook arm. The hook arm is hinged to the arm groove of the outermost slide rail and connected to a torsion spring for reset. The initial position is set within the arm groove, and the reset position is at a 90° angle to the initial position. The initial position is locked by the second drive lock at 0°, and the reset position is locked by the third drive lock. A hook ring adapted to the hook arm is set at the front end of the car. When the elevator falls, the elevator safety brake will brake the elevator. At this time, the first drive lock is unlocked, the door knife falls with the mounting plate, the second drive lock is unlocked, the hook arm resets and contacts the groove, and is locked by the third drive lock. At this time, the door knife body contacts the door ball. In the power-on state, the door operator motor drives the door knife to open the car door lock, and the car door opens. In the power-off state, the door is pried open from inside the car, the door knife opens the car door lock, and the car door and landing door open. The maximum sliding stroke of the sliding device is less than or equal to the safe height.

2. The door knife operating method according to claim 1, characterized in that: When the elevator malfunctions and falls, the first drive lock is unlocked. The sliding device is equipped with a secondary unlocker. When the elevator stops falling due to the safety clamp action, the secondary unlocker is unlocked. At this time, the sliding device slides down, the second drive lock is unlocked, and the hook arm and hook ring engage.

3. The door knife operating method according to claim 1, characterized in that: The sliding device adopts a three-section sliding rail. The first drive lock unlocking includes a first sleeve, a second sleeve, and a third sleeve. The first sleeve, the second sleeve, and the third sleeve are slidably connected in sequence. The cavities of the first sleeve, the second sleeve, and the third sleeve are connected and equipped with a reset spring. One end of the traction cable is connected to the first sleeve. The traction cable is fixed to the elevator speed limiting rope via several guide wheels and at its fixed end.

4. The door knife operating method according to claim 1, characterized in that: The sliding device includes a first slide rail, a second slide rail, and a third slide rail. The first and second slide rails are respectively provided with pulley grooves. The second and third slide rails are provided with rubber pulleys at matching positions to adapt to the pulley grooves and form damped sliding.

5. The door knife operating method according to claim 1, characterized in that: The sliding device is equipped with a backstop mechanism between adjacent slide rail components. The backstop direction is upward. The backstop mechanism includes a backstop hook and backstop teeth. The backstop hook is hinged to the outer slide rail component, and several backstop teeth are arranged on the adjacent inner slide rail components.

6. The door knife operating method according to claim 2, characterized in that: The auxiliary unlocking device includes a fixed base, rollers, pressure rollers, a fixing belt, guide rollers, a fixing device, and a fixing cable. The rollers, pressure rollers, and guide rollers are rotatably mounted on the fixed base. The rollers and pressure rollers are opposite each other and adapted to the elevator speed-limiting rope. The pressure rollers have protrusions that adapt to the two sides of the guide rollers. The pressure rollers are equipped with torsion springs to allow them to initially detach from the guide rollers. The fixing cable is fixed to the fixing device via the groove of the guide rollers. The fixing belt is fixed to the fixing device via the two sides of the guide rollers. The fixing device is fixed to the elevator speed-limiting rope at the corresponding position. The fixed base is fixed to the car. The second drive lock is L-shaped, with one end fixed to the head end of the secondary slide rail component, and the other end inserted into the slide rail component at the head end and longitudinally sliding and adapted to the hook arm in its initial position. The fixing belt is fixed to the outermost slide rail component via a first connecting cable, and the fixing cable is fixed to the traction cable via a second connecting cable.

7. A door knife operating method according to claim 6, characterized in that: The fixing strap and fixing cable are fixed on the elastic clamp on the fixing device.

8. A door knife operating method according to claim 6, characterized in that: The fixing strap and fixing cable are elastic.

9. A door knife operating method according to claim 3, characterized in that: The first sleeve is positioned at the bottom of the cavity of the second sleeve and magnetically attracted, and the second sleeve is positioned at the bottom of the cavity of the third sleeve and magnetically attracted.

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