Elevator car door knife

Abstract

The utility model relates to an elevator car door vane which comprises a door vane body, a lock hook and a base plate installed on an elevator door machine, a main linkage plate is installed on one side of the base plate, a transmission plate is arranged on the other side of the base plate, and the main linkage plate and the transmission plate share a rotating center and rotate synchronously. An elastic energy storage piece used for driving the door knife to be closed is arranged on one side of the transmission plate. A door knife shaft is arranged on the side, away from the base plate, of the transmission plate, and a door opening motor drives the transmission plate to rotate through the door knife shaft. One end of the elastic energy storage part is rotationally connected to the transmission plate, the other end of the elastic energy storage part is rotationally connected to the surface of the base plate, and the included angle between the energy releasing direction of the elastic energy storage part and the horizontal plane is an acute angle. The situation that in the prior art, in order to guarantee that the door knife can be automatically closed when the door opening motor stops working, the stretching state of the stretching spring needs to be kept when the door opening motor works, and energy consumption is large is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of elevators, in particular to an elevator car door knife. Background Art

[0002] The elevator car door knife is the opening and closing device of the elevator car door. It is the mechanism mainly responsible for opening and closing the elevator hall car door. When it receives the elevator door opening and closing signals, the elevator door machine controls the door opening motor through its own control system, converting the torque generated by the motor into a force in a specific direction to close or open the door.

[0003] A Chinese utility model patent with publication number CN214733684U discloses an integrated car door lock synchronous knife, including a lock hook, a base plate fixedly installed on the elevator door machine, the surface of the base plate is connected with axle pin 1 and axle pin 2, the surfaces of axle pin 1 and axle pin 2 are respectively hinged with connecting plate 1 and connecting plate 2, the surfaces of connecting plate 1 and connecting plate 2 are jointly hinged with two door knives, the lock hook is hinged on the back side of the base plate, an arc portion is provided on the side of the lock hook, an unlocking plate is fixedly installed on the baffle, a manual unlocking mechanism is arranged on the base plate, a supporting component for supporting the lock hook is arranged on the base plate, a transmission component for driving the door knife to move is arranged on the base plate, and a protective component is arranged on the base plate.

[0004] The above technical solution includes a protective component, at which time the door opening motor stops working, and the protective component is used to drive the door knife to close automatically. Among them, through the spring 2 in the protective component in a non-fault state, the door opening motor exerts a traction force on the spring 2 to keep the spring 2 in a stretched state; in a fault state, the door opening motor stops working, the spring 2 is reset and drives the door knife to close. Spring 2 is a tension spring. This means that in a non-fault state, the door opening motor needs to continuously stretch the spring 2 to store energy for the spring 2, which has the defect that the door opening motor needs to consume extra energy when operating normally. Utility Model Content

[0005] In order to improve the related technology, in order to ensure that the door knife can automatically close when the door opening motor stops working, the tension spring needs to be kept in a stretched state when the door opening motor is working, which consumes a lot of energy. The present application provides an elevator door knife to ensure that the door knife can automatically close when the door opening motor stops working, and at the same time, reduce the energy consumption of the door opening motor during normal operation.

[0006] The present application provides an elevator car door knife, which adopts the following technical solution:

[0007] An elevator car door knife, comprising a door knife, a lock hook and a base plate installed on the elevator door machine, a main linkage plate installed on one side of the base plate, a transmission plate arranged on the other side of the base plate, the door knife installed on the side of the main linkage plate away from the base plate, the lock hook and the transmission plate are arranged on the base plate on the same side, the main linkage plate and the transmission plate share a rotation center and rotate synchronously, an elastic energy storage member for driving the door knife to close is arranged on one side of the transmission plate; a door knife shaft is arranged on the side of the transmission plate away from the base plate, and a door opening motor drives the transmission plate to rotate through the door knife shaft;

[0008] One end of the elastic energy storage member is rotatably connected to the transmission plate, and the other end of the elastic energy storage member is rotatably connected to the surface of the base plate, and the angle between the direction in which the elastic energy storage member releases energy and the horizontal plane is an acute angle.

[0009] Optionally, two ends of the transmission plate rotating in the circumferential direction of the rotation center are respectively a first swing arm and a second swing arm, the door knife shaft is arranged on the first swing arm, and the door knife motor drives the door knife shaft to rotate in the circumferential direction of the rotation center;

[0010] The transmission plate rotates in the clockwise direction to control the door knife to close, and the first swing arm is provided with a fixing plate on one side in the clockwise direction, and one end of the elastic energy storage member is rotatably connected to the fixing plate.

[0011] Optionally, the elastic energy storage member includes a guide rod and an energy storage spring sleeved on the guide rod, the guide rod includes a rotating end and a swinging end, the rotating end is fixedly connected to the base plate and is located on the clockwise side of the first swing arm, the swinging end is fixedly connected to the fixed plate and swings with the rotation of the first swing arm, and the angle between the extension direction of the axis of the guide rod and the horizontal plane is an acute angle.

[0012] Optionally, an unlocking plate is provided on the second swing arm, and the lock hook is rotatably connected to the base plate, then the lock hook has a first rotating end and a second rotating end, the first rotating end is engaged with an external locking element, the second rotating end is provided with a positioning column engaged with the unlocking plate, the unlocking plate is linked to the main linkage plate, and the unlocking plate rotates with the main linkage plate to control the first rotating end to be locked to or unlocked from the lock element.

[0013] Optionally, the door knife includes a first blade and a second blade respectively arranged on both sides of the rotation center, the first blade is arranged on the side of the rotation center away from the lock hook, and the main linkage plate includes a first follower arm connected to the first blade by fixed axis rotation and a second follower arm connected to the second blade by fixed axis rotation, and the main linkage plate rotates circumferentially along the rotation center to control the first blade and the second blade to approach or move away from each other;

[0014] The main linkage plate also includes an unlocking arm, which is provided with a rocker rod. The base plate is provided with an arc groove for the rocker rod to pass through and swing. One end of the rocker rod away from the unlocking arm is clamped on the unlocking plate to drive the unlocking plate to rotate. The main linkage plate controls the first rotating end to be locked to the lock element or unlocked to the lock element through the rocker rod.

[0015] Optionally, the base plate is rotatably connected to a clamping rod on a side of the first swing arm away from the rotation center, one end of the clamping rod protrudes from the upper side of the base plate, the other end of the clamping rod is provided with a positioning groove, the first swing arm is provided with a positioning rod, and the positioning rod is clamped in the positioning groove.

[0016] Optionally, an unlocking piece is rotatably provided on the base plate, and a lever is protrudingly provided at one end of the unlocking piece, and the lever abuts against the lower edge of the lock hook.

[0017] Optionally, one end of the base plate away from the main linkage plate is rotatably connected to a secondary linkage plate, and one end of the first blade away from the main linkage plate and one end of the second blade away from the main linkage plate are respectively rotatably connected to two ends of the secondary linkage plate.

[0018] Optionally, a side of the first swing arm away from the fixing plate abuts against a limiting column.

[0019] By adopting the above technical solution, when the door opening motor works normally, the elastic energy storage member rotates with the transmission plate. When the door opening motor drives the door knife to open, the layer door ball makes the door knife float, and the end of the elastic energy storage member connected to the transmission plate retracts toward the end away from the transmission plate, and the elastic energy storage member stores energy. At this time, the force of the elastic energy storage member acting in the opposite direction on the door opening motor is the component of the restoring force of the elastic energy storage member in the horizontal direction, thereby reducing the extra work done by the door opening motor to resist the restoring force of the elastic energy storage member, thereby reducing the energy consumption of the door opening motor. When the elevator system fails and the door opening motor is powered off, the elastic energy storage member releases energy and recovers to push the transmission plate to rotate counterclockwise, and drives the main linkage plate to rotate through the transmission plate to close the door knife. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be discussed below. Obviously, the technical solutions described in conjunction with the drawings are only some embodiments of the utility model. For ordinary technicians in this field, other embodiments and their drawings can be obtained based on the embodiments shown in these drawings without paying creative work.

[0021] Figure 1It is a structural schematic diagram of the front side of the base plate in the elevator car door blade.

[0022] Figure 2 It is a structural schematic diagram of the back side of the base plate in the elevator car door blade.

[0023] Figure 3 It is a schematic diagram of the structure after the transmission plate in the elevator car door knife rotates counterclockwise.

[0024] Figure 4 This is an exploded view of the elevator door knife.

[0025] Figure 5 It is a structural diagram of the main linkage plate and transmission plate in the elevator car door knife.

[0026] Figure 6 It is a structural diagram of the lock hook and transmission plate in the elevator car door knife.

[0027] In the figure: 1. door knife; 2. lock hook; 3. base plate; 4. main linkage plate; 5. transmission plate; 6. rotation center; 7. elastic energy storage member; 8. door knife shaft; 51. first swing arm; 52. second swing arm; 9. fixed plate; 10. guide rod; 11. energy storage spring; 12. shaft pin; 13. support shaft; 14. slide block; 15. unlocking plate; 16. lock piece; 17. positioning column; 18. lock hook groove; 101. first blade; 102. second blade; 41. first follower arm; 42. second follower arm; 43. unlocking arm; 19. swing rod; 20. arc groove; 21. clamping rod; 22. positioning groove; 23. positioning rod; 24. unlocking piece; 25. lever; 26. auxiliary linkage plate; 27. limit column; 28. groove. DETAILED DESCRIPTION

[0028] The following will be combined with the accompanying drawings to clearly and completely describe the technical solutions of the various embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] The embodiment of the utility model provides an elevator car door knife, such as Figures 1 to 6As shown, it includes a door knife 1, a lock hook 2 and a base plate 3 installed on the elevator door machine, a main linkage plate 4 is installed on one side of the base plate 3, and a transmission plate 5 is arranged on the other side of the base plate 3. The door knife 1 is installed on the side of the main linkage plate 4 away from the base plate 3, the lock hook 2 and the transmission plate 5 are arranged on the same side of the base plate 3, the main linkage plate 4 and the transmission plate 5 share a rotation center 6 and rotate synchronously, and an elastic energy storage member 7 for driving the door knife 1 to close is arranged on one side of the transmission plate 5; a door knife 1 shaft is arranged on the side of the transmission plate 5 away from the base plate 3, and the door opening motor drives the transmission plate 5 to rotate through the door knife 1 shaft;

[0030] One end of the elastic energy storage member 7 is rotatably connected to the transmission plate 5, and the other end of the elastic energy storage member 7 is rotatably connected to the surface of the base plate 3, and the angle between the direction in which the elastic energy storage member 7 releases energy and the horizontal plane is an acute angle.

[0031] Specifically, in this embodiment, when the door opening motor works normally, the elastic energy storage member 7 rotates with the transmission plate 5. When the door opening motor drives the door blade 1 to open, the layer door ball makes the door blade 1 float, and the end of the elastic energy storage member 7 connected to the transmission plate 5 retracts toward the end away from the transmission plate 5, and the elastic energy storage member 7 stores energy. At this time, the force of the elastic energy storage member 7 acting in the opposite direction on the door opening motor is the component force of the restoring force of the elastic energy storage member 7 in the horizontal direction, thereby reducing the extra work done by the door opening motor to resist the restoring force of the elastic energy storage member 7, thereby reducing the energy consumption of the door opening motor. When the elevator system fails and the door opening motor is powered off, the elastic energy storage member 7 releases energy and recovers to push the transmission plate 5 to rotate counterclockwise, and drives the main linkage plate 4 to rotate through the transmission plate 5, so that the door blade 1 is closed.

[0032] In a preferred embodiment of the utility model, the two ends of the transmission plate 5 rotating along the rotation center 6 are respectively the first swing arm 51 and the second swing arm 52, the door knife 1 shaft is arranged on the first swing arm 51, and the door knife 1 motor drives the door knife 1 shaft to rotate along the rotation center 6;

[0033] The transmission plate 5 rotates in the clockwise direction to control the door blade 1 to close, and a fixing plate 9 is provided on one side of the first swing arm 51 in the clockwise direction, and one end of the elastic energy storage member 7 is rotatably connected to the fixing plate 9 .

[0034] Specifically, in this embodiment, the door knife 1 has a knife-retracted state and a knife-extended state.

[0035] The fixed plate 9 is located between the rotation center 6 and the door blade 1 axis. During the rotation of the connection point between the fixed plate 9 and the elastic energy storage member 7 with the rotation center 6 as the center, the distance between the connection point and the connection point between the elastic energy storage member 7 and the base plate 3 is shortened, and the elastic energy storage member 7 is deformed to store energy, and the elastic energy storage member 7 generates a restoring force. The above energy storage process is generated by the layer door ball squeezing the door blade 1 to make it float, that is, the energy storage process of the elastic energy storage member 7 does not require additional force from the door opening motor. After the door machine control system releases the door closing holding force, the elastic energy storage member 7 is reset, and the door blade 1 is driven to automatically reset to the knife-retracting state.

[0036] In a preferred embodiment of the utility model, the elastic energy storage member 7 includes a guide rod 10 and an energy storage spring 11 sleeved on the guide rod 10, the guide rod 10 includes a rotating end and a swinging end, the rotating end is fixedly connected to the base plate 3 and is located on the clockwise side of the first swing arm 51, the swinging end is fixedly connected to the fixed plate 9 and swings with the rotation of the first swing arm 51, and the angle between the extension direction of the axis of the guide rod 10 and the horizontal plane is an acute angle.

[0037] Specifically, in this embodiment, an axle pin 12 is fixed on the base plate 3, and one end of the guide rod 10 is rotatably connected to the axle pin 12; a fixed plate 9 is rotatably connected to one end of the base plate 3 with a support shaft 13, and one end of the support shaft 13 is provided with a slider 14 for the other end of the guide rod 10 to pass through, and an energy storage spring 11 is abutted against the slider 14. When the fixed plate 9 rotates along the rotation center 6, the slider 14 slides toward the end of the guide rod 10 away from the fixed plate 9, causing the energy storage spring 11 to contract under force.

[0038] In a preferred embodiment of the present utility model, an unlocking plate 15 is provided on the second swing arm 52, and the lock hook 2 is rotatably connected to the base plate 3, so that the lock hook 2 has a first rotating end and a second rotating end, the first rotating end is clamped with the external lock element 16, and the second rotating end is provided with a positioning column 17 clamped with the unlocking plate 15, the unlocking plate 15 is linked to the main linkage plate 4, and the unlocking plate 15 rotates with the main linkage plate 4 to control the first rotating end to be locked or unlocked with the lock element 16.

[0039] Specifically, in this embodiment, the lock element 16 is provided with a horizontal lock hook 2 slot for inserting the first rotating end of the lock hook 2. When the unlocking plate 15 rotates and presses down the second rotating end following the main linkage plate 4, the first rotating end is separated from the lock element 16, and the lock hook 2 is unlocked from the lock element 16; when the layer door ball exits the door blade 1, so that the door blade 1 is restored from the floating state, the unlocking plate 15 no longer presses down the second rotating end, and the lock hook 2 falls back into the lock hook 2 slot under its own gravity, so that the lock hook 2 and the lock element 16 are locked.

[0040] In a preferred embodiment of the present utility model, the door knife 1 includes a first blade 101 and a second blade 102 respectively arranged on both sides of the rotation center 6, and the first blade 101 is arranged on the side of the rotation center 6 away from the lock hook 2, and the main linkage plate 4 includes a first follower arm 41 connected to the first blade 101 by fixed axis rotation and a second follower arm 42 connected to the second blade 102 by fixed axis rotation, and the main linkage plate 4 rotates circumferentially along the rotation center 6 to control the first blade 101 and the second blade 102 to move closer to or away from each other;

[0041] The main linkage plate 4 also includes an unlocking arm 43, which is provided with a rocker rod 19. The base plate 3 is provided with an arc groove 20 for the rocker rod 19 to pass through and swing. The end of the rocker rod 19 away from the unlocking arm 43 is clamped on the unlocking plate 15 to drive the unlocking plate 15 to rotate. The main linkage plate 4 controls the first rotating end to be locked to the lock 16 or unlocked to the lock 16 through the rocker rod 19.

[0042] Specifically, in this embodiment, the second follower arm 42 is located above the rotation center 6, and the first follower arm 41 and the unlocking arm 43 are located below the rotation center 6. The second follower arm 42 is rotatably connected to the upper end of the second blade 102, and the first follower arm 41 is rotatably connected to the middle section of the first blade 101 and close to the rotation center 6. Among them, the unlocking arm 43 is located on the side of the first follower arm 41 close to the lock hook 2. When the first blade 101 and the second blade 102 float under the pressure of the layer door ball, the unlocking arm 43 deflects, and the swing rod 19 slides accordingly, pressing down the unlocking plate 15, so that the lock hook 2 is unlocked from the lock element 16, thereby improving the response speed.

[0043] In a preferred embodiment of the utility model, the base plate 3 is rotatably connected to a clamping rod 21 on the side of the first swing arm 51 away from the rotation center 6, one end of the clamping rod 21 protrudes from the upper side of the base plate 3, and the other end of the clamping rod 21 is provided with a positioning groove 22. The first swing arm 51 is provided with a positioning rod 23, and the positioning rod 23 is clamped in the positioning groove 22.

[0044] Specifically, in this embodiment, when the floor door ball touches the locking rod 21 protruding from the upper side of the base plate 3, the first swing arm 51 withdraws from the positioning slot 22, so that the transmission plate 5 can rotate under the drive of the door opening motor to control the opening and closing of the door knife 1, so as to avoid the door knife 1 from opening and closing incorrectly when the elevator does not meet the door opening conditions due to the deviation of the transmission plate 5.

[0045] In a preferred embodiment of the utility model, an unlocking piece 24 is rotatably provided on the base plate 3 , and a lever 25 is protruded from one end of the unlocking piece 24 , and the lever 25 abuts against the lower edge of the lock hook 2 .

[0046] Specifically, in this embodiment, a pull rope is hung on the end of the unlocking piece 24 away from the lever 25. By pulling the pull rope, the lever 25 is rotated upward, pushing the first rotating end of the lock hook 2 to lift up, thereby achieving the effect of manually releasing the locking relationship between the lock hook 2 and the lock element 16.

[0047] In a preferred embodiment of the present invention, one end of the base plate 3 away from the main linkage plate 4 is rotatably connected to the secondary linkage plate 26, and one end of the first blade 101 away from the main linkage plate and one end of the second blade 102 away from the main linkage plate are respectively rotatably connected to the two ends of the secondary linkage plate 26.

[0048] Specifically, in this embodiment, one end of the auxiliary linkage plate 26 is connected to the lower end of the first blade 101 away from the rotation center 6 by fixed axis rotation, and the other end of the auxiliary linkage plate 26 is connected to the second blade 102 away from the rotation center 6 by fixed axis rotation, and the connection between the auxiliary linkage plate 26 and the second blade 102 is higher than the connection between the auxiliary linkage plate 26 and the first blade 101.

[0049] In a preferred embodiment of the present invention, a side of the first swing arm 51 away from the fixing plate 9 abuts against the limiting column 27 .

[0050] Specifically, in this embodiment, the first swing arm 51 is provided with a groove 28 that abuts against the side wall of the limiting column 27. When the first swing arm 51 rotates to a vertical position, the limiting column 27 abuts against the first swing arm 51 to prevent the first swing arm 51 from over-deflecting under the action of inertia when the energy storage spring 11 is reset.

[0051] In summary, the lock hook 2 cooperates with the external lock member 16 to form a car door lock.

[0052] Regarding the process of opening the car door: in the initial state of the door knife 1, the first blade 101 and the second blade 102 are away from each other, that is, the blade arm of the door knife 1 is open, and the gap between the lock hook 2 and the lock 16 is 10mm. During the door opening process, the first blade 101 and the second blade 102 are close to each other, that is, the blade arm of the door knife 1 shrinks, and the blade arm contacts the floor door ball during the shrinking process. The first blade 101 and the second blade 102 are squeezed by the floor door ball and float to both sides respectively. At this time, the unlocking arm 43 on the main linkage plate 4 deviates with the second blade 102, and the swing rod 19 slides in the direction close to the rotation center 6, thereby pushing the unlocking plate 15 downward. Since the unlocking plate 15 is clamped on the second rotating end of the lock hook 2, the lock hook 2 rotates, and its first rotating end is unlocked from the lock 16, so that the car door lock is opened. Among them, when the first blade 101 and the second blade 102 are squeezed by the floor door ball, the first blade 101 floats 5mm to the left and the second blade 102 floats 7.5mm to the right.

[0053] Regarding the closing process of the car door: during the closing process, the floor door ball maintains contact with the door knife 1, and the car door lock is in the open state; as the knife arm of the door knife 1 opens, the first blade 101 and the second blade 102 move away from each other, so that the door knife 1 is separated from the floor door ball, the door knife 1 exits the floating state, and the main linkage plate 4 is reset. At this time, the unlocking plate 15 no longer applies pressure to the first rotating end of the lock hook 2, and the lock hook 2 closes on the lock member 16 under the action of its own weight.

[0054] Among them, the size of the door knife 1 when it is retracted is 33.5mm, and the size when the door knife 1 is extended but the lock hook 2 is not unlocked is 71mm.

[0055] The door machine is in the leveling area: use a force of no more than 300N to pull the car door panel in the car. The door machine system detects the door pulling force and automatically releases the door closing holding force. The elastic energy storage member 7 resets and the door knife 1 can automatically reset to the knife-closing state; during the resetting process of the door knife 1, the first blade 101 and the second blade 102 are squeezed by the floor door ball and forced to float, thereby triggering the unlocking arm 43 on the main linkage plate 4 to deflect, and the unlocking plate 15 is driven downward through the swing rod 19 to open the car door lock, thereby achieving the purpose of opening the car door and the floor door at the same time. If the door opening motor is in the power-off state at this time, the elastic energy storage member 7 can still perform the reset action.

[0056] The door machine is in a non-level area: when the car door panel is pulled in the car, the door machine control system will also detect the door pulling force and automatically release the door closing holding force, and the elastic energy storage member 7 releases energy to automatically reset the door knife 1 to the received state; during the resetting process of the door knife 1, since the floor door ball is not between the first blade 101 and the second blade 102, the door knife 1 does not float, and the unlocking plate 15 does not move at this time, and the lock hook 2 only slides in the lock hook 2 groove opened by the lock member 16. The lock hook 2 and the lock member 16 are still engaged with each other, and the car door cannot be opened. Among them, the original clearance of the lock hook 2 sliding in the lock hook 2 groove is 10mm. When the door is pulled, the theoretical maximum clearance of the door panel is 20mm, which is less than 50mm.

Claims

1. An elevator door knife, characterized in that: It comprises a door knife (1), a lock hook (2) and a base plate (3) installed on an elevator door machine, a main linkage plate (4) is installed on one side of the base plate (3), a transmission plate (5) is arranged on the other side of the base plate (3), the door knife (1) is installed on the side of the main linkage plate (4) away from the base plate (3), the lock hook (2) and the transmission plate (5) are arranged on the base plate (3) on the same side, the main linkage plate (4) and the transmission plate (5) share a rotation center (6) and rotate synchronously, and an elastic energy storage member (7) for driving the door knife (1) to close is arranged on one side of the transmission plate (5); a door knife (1) shaft is arranged on the side of the transmission plate (5) away from the base plate (3), and a door opening motor drives the transmission plate (5) to rotate through the door knife (1) shaft; One end of the elastic energy storage member (7) is rotatably connected to the transmission plate (5), and the other end of the elastic energy storage member (7) is rotatably connected to the surface of the base plate (3), and the angle between the direction in which the elastic energy storage member (7) releases energy and the horizontal plane is an acute angle.

2. The elevator car door knife according to claim 1, characterized in that: The two ends of the transmission plate (5) rotating in the circumferential direction around the rotation center (6) are respectively a first swing arm (51) and a second swing arm (52); the door knife (1) shaft is arranged on the first swing arm (51); and the door knife (1) motor drives the door knife (1) shaft to rotate in the circumferential direction around the rotation center (6); The transmission plate (5) rotates in the clockwise direction to control the door blade (1) to close, and a fixing plate (9) is provided on one side of the first swing arm (51) in the clockwise direction, and one end of the elastic energy storage member (7) is rotatably connected to the fixing plate (9).

3. The elevator car door knife according to claim 2, characterized in that: The elastic energy storage member (7) comprises a guide rod (10) and an energy storage spring (11) sleeved on the guide rod (10); the guide rod (10) comprises a rotating end and a swinging end; the rotating end is connected to the base plate (3) in a fixed-axis rotation manner and is located on one side of the first swing arm (51) in the clockwise direction; the swinging end is connected to the fixed-axis rotation manner and swings with the rotation of the first swing arm (51); the angle between the extension direction of the axis of the guide rod (10) and the horizontal plane is an acute angle.

4. The elevator car door knife according to claim 3, characterized in that: An unlocking plate (15) is provided on the second swing arm (52), and the lock hook (2) is rotatably connected to the base plate (3), so that the lock hook (2) has a first rotating end and a second rotating end, the first rotating end is engaged with an external locking element (16), and the second rotating end is provided with a positioning column (17) engaged with the unlocking plate (15), the unlocking plate (15) is linked to the main linkage plate (4), and the unlocking plate (15) rotates following the main linkage plate (4) to control the first rotating end to be locked with the locking element (16) or unlocked with the locking element (16).

5. The elevator door knife according to claim 4, characterized in that: The door knife (1) comprises a first blade (101) and a second blade (102) which are arranged on both sides of the rotation center (6), the first blade (101) being arranged on a side of the rotation center (6) away from the lock hook (2), and the main linkage plate (4) comprises a first follower arm (41) connected to the first blade (101) by fixed axis rotation and a second follower arm (42) connected to the second blade (102) by fixed axis rotation, and the main linkage plate (4) rotates circumferentially along the rotation center (6) to control the first blade (101) and the second blade (102) to move closer to or farther away from each other; The main linkage plate (4) further comprises an unlocking arm (43), wherein the unlocking arm (43) is provided with a swing rod (19), and the base plate (3) is provided with an arc groove (20) for the swing rod (19) to pass through and swing, and one end of the swing rod (19) away from the unlocking arm (43) is clamped on the unlocking plate (15) to drive the unlocking plate (15) to rotate, and the main linkage plate (4) controls the first rotating end to be locked to the locking element (16) or unlocked to the locking element (16) through the swing rod (19).

6. The elevator car door knife according to claim 5, characterized in that: The base plate (3) is rotatably connected to a clamping rod (21) at a side of the first swing arm (51) away from the rotation center (6); one end of the clamping rod (21) protrudes from the upper side of the base plate (3); the other end of the clamping rod (21) is provided with a positioning groove (22); the first swing arm (51) is provided with a positioning rod (23), and the positioning rod (23) is clamped in the positioning groove (22).

7. The elevator car door knife according to claim 6, characterized in that: An unlocking piece (24) is rotatably provided on the base plate (3), and a lever (25) is protruding from one end of the unlocking piece (24), and the lever (25) abuts against the lower edge of the lock hook (2).

8. The elevator car door knife according to claim 7, characterized in that: One end of the base plate (3) away from the main linkage plate (4) is connected to a secondary linkage plate (26) in a fixed-axis rotation manner, and one end of the first blade (101) away from the main linkage plate (4) and one end of the second blade (102) away from the main linkage plate (4) are respectively connected to two ends of the secondary linkage plate (26) in a fixed-axis rotation manner.

9. The elevator car door knife according to claim 8, characterized in that: The side of the first swing arm (51) away from the fixing plate (9) abuts against the limiting column (27).

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