An elevator electric door blade

Abstract

The application discloses an elevator electric door blade, which comprises a door blade, a first compression spring and a bottom plate. The door blade comprises a left blade and a right blade. The bottom plate is fixed on a left hanging plate of a door machine. A power arm and a rotating arm are coaxially arranged on the bottom plate and are fixedly connected. The left blade and the right blade are vertically arranged on the rotating arm. When the rotating arm rotates, the left blade and the right blade are driven to approach and separate from each other. The left and right ends of the first compression spring are connected with the left hanging plate of the door machine and the power arm respectively. When the first compression spring swings and is compressed to a certain amount, the first compression spring releases the pressure and is pressed against the power arm to prevent the power arm from rotating, so that the door blade is in an open state and the door blade will not be closed when the door machine is powered off.

Description

Technical Field

[0001] This invention relates to the field of elevators, and more specifically to an electric elevator door knife. Background Technology

[0002] GB / T7588.1-2020 Implementation, Section 5.3.15, stipulates the opening requirements for car doors:

[0003] "1. If the elevator stops in the unlocked area for any reason, the car door and landing door should be able to be manually opened with a force not exceeding 300N in the following locations:"

[0004] a) At the floor where the car is located, unlock the landing door using the triangular key or by going through the car door;

[0005] b) Inside the elevator car.

[0006] 2. To restrict passengers from opening the car doors, measures should be provided to ensure that:

[0007] a) When the car is running, the force required to open the car door is greater than 50N;

[0008] b) When the car is outside the unlocking area, a force of 1000N is applied to the door opening restriction device, and the car door cannot be opened more than 50mm.

[0009] 3. At least when the car is stopped in the unlocking zone, after opening the corresponding landing door, the car door should be able to be opened from the landing without tools, unless a triangular key or a tool permanently installed on site is used. This requirement also applies to car doors with compliant car door locking devices.

[0010] There are currently two solutions in the market for implementing the standard requirements:

[0011] 1. Add a door opening restriction device to the car door;

[0012] 2. Configure car door locks.

[0013] Since Option 1 cannot meet the requirements of the car door lock, Option 2 is the preferred option.

[0014] In existing technologies, to meet the requirements of Clause 5.3.15 of GB / T7588.1-2020 regarding the opening of car doors, unlocking in the landing area often involves de-energizing the door knife blade in the unlocking area, causing it to retract. This triggers the landing door lock and car door lock hooks to lift via the landing door ball, thus achieving unlocking. The drawback of this solution is:

[0015] 1. When the door operator is powered off, the door blade retracts. If the car is moving up or down at this time, the door blade will hit the door ball.

[0016] 2. After the door operator is powered off, the door knife retracts. If the car is moving up or down at this time, the door knife blade will hit the door ball, and the landing door lock and car door lock will disengage. At this time, the electric brake release, emergency leveling and other functions will not be able to operate normally because the safety circuit will be disconnected due to the disengagement of the landing door lock and car door lock.

[0017] 3. In the event of an abnormal power outage at the landing, since the landing door lock and car door lock are disconnected, all personnel can freely enter and exit the car, posing a safety risk.

[0018] Furthermore, the existing technology has a high failure rate for car door locks, and the reliability of car door lock unlocking is insufficient. It cannot effectively unlock when the door knife is open or closed. The car door lock door knife only engages with the fixed hook, and the door operator fixing plate and the door operator hanging plate do not hook together to prevent abnormal door opening. Summary of the Invention

[0019] The purpose of this invention is to provide an electric elevator door knife, which is compressed to a certain amount by a first compression spring and then releases pressure to prevent the power arm from rotating, thereby ensuring that the door knife is in an open state and will not retract and close when the door operator is powered off.

[0020] The technical solution adopted by the present invention to solve the above problems is:

[0021] An electric elevator door knife includes a door knife, a first compression spring, and a base plate. The door knife includes a left blade and a right blade. The base plate is fixed to the left mounting plate of the door operator. A power arm and a rotating arm are coaxially rotatably mounted on the base plate and are fixedly connected. The left and right blades are both vertical and rotatably mounted on the rotating arm. When the rotating arm rotates, it drives the left and right blades to approach and separate from each other. The left and right ends of the first compression spring are respectively connected to the left mounting plate of the door operator and the power arm.

[0022] In the above technical solution, preferably, a locking hook is rotatably provided on the base plate, and an interlocking hook is engaged with the right end of the locking hook. The interlocking hook is fixed to the right hanging plate of the door operator. A limit post is provided on the rear side of the locking hook. A fixing hook is fixed on the fixing plate of the door operator. The limit post is engaged in the fixing hook. An inclined surface is provided on the left side of the fixing hook. When the limit post moves to the right and contacts the inclined surface of the fixing hook, it drives the limit post to move upward.

[0023] In the above technical solution, preferably, a manual unlocking component is provided between the base plate and the lock hook. The manual unlocking component includes a second compression spring, a pull rope, and a locking member. The locking member is rotatably mounted on the base plate, and the upper end of the locking member is locked onto the left end of the lock hook. The two ends of the second compression spring abut against the locking member and the base plate respectively, and the second spring drives the locking member to abut against the base plate. The pull rope passes through the compression spring and the upper end of the pull rope is fixedly connected to the locking member.

[0024] In the above technical solution, preferably, a disc is fixed on the rotating arm, a connecting rope is wound around the disc, and the two ends of the connecting rope are respectively fixed to the power arm and the locking hook.

[0025] In the above technical solution, preferably, a self-locking hinge arm is provided between the upper end of the power arm and the base plate. The left and right ends of the self-locking hinge arm are respectively hinged to the power arm and the base plate. The self-locking hinge arm includes a left hinge arm and a right hinge arm. The right end of the left hinge arm is hinged to the left end of the right hinge arm. A roller is coaxially rotatably provided on the rear side of the connection between the left and right hinge arms. A trigger is fixed on the fixed plate of the door operator. An inclined surface is provided on the left side of the trigger. When the roller moves to the right and contacts the inclined surface of the trigger, it drives the roller to move upward.

[0026] In the above technical solution, preferably, an upper auxiliary arm and a lower auxiliary arm are provided between the left blade and the right blade. The left and right ends of the upper auxiliary arm are respectively hinged to the left blade and the right blade, and the left and right ends of the lower auxiliary arm are respectively hinged to the left blade and the right blade, and the lower auxiliary arm is slidably disposed in the track hole on the base plate.

[0027] In the above technical solution, preferably, a conductive plug is fixed on the lock hook, and a conductive socket is fixed on the fixing plate of the door operator, and the conductive plug and the left side of the conductive socket are connected in an adaptive contact.

[0028] In the above technical solution, preferably, a third compression spring is provided between the base plate and the lock hook, the two ends of the third compression spring abut against the base plate and the lock hook respectively, and the third compression spring drives the right end of the lock hook to rotate downward.

[0029] In the above technical solution, preferably, the interlocking hook is provided with a through hole for the insertion of the protrusion of the locking hook, and the through hole is an elongated strip in the left-right direction.

[0030] In the above technical solution, preferably, the first compression spring is provided with a compression spring bracket and a compression spring guide rod. The compression spring bracket is rotatably mounted on the left hanging plate of the gantry crane. The compression spring guide rod is inserted into the first compression spring. The left end of the compression spring guide rod is slidably inserted into the compression spring bracket, and the right end of the compression spring guide rod is hinged to the power arm.

[0031] Compared with the prior art, the present invention has the following advantages and effects:

[0032] This invention utilizes a door operator to drive the power arm and rotating arm to rotate counterclockwise, thereby closing the door knife. Simultaneously, a first compression spring, using its connection point with the left mounting plate of the door operator as a fulcrum, swings downwards, compresses to a certain amount, and then releases pressure to prevent the power arm from rotating. Conversely, the door operator drives the power arm and rotating arm to rotate clockwise, thereby opening the door knife. Simultaneously, the first compression spring swings upwards, compresses to a certain amount, and then releases pressure to prevent the power arm from rotating. Therefore, through the action of the first compression spring, when the door knife is in the open state and the door operator is de-energized, the door knife will not retract and close. This reduces the risk of the door knife colliding with the door rollers on the elevator landing doors due to the vertical movement of the car, thereby reducing the risk of the safety circuit being broken due to the impact and the elevator malfunctioning, thus improving the safety of elevator operation. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the structure of the elevator electric door knife according to an embodiment of the present invention.

[0034] Figure 2 yes Figure 1 A schematic diagram of the back structure.

[0035] Figure 3 yes Figure 1 The front view.

[0036] Figure 4 yes Figure 3 A schematic diagram showing the state where the center door knife is closed but not in contact with the landing door ball.

[0037] Figure 5 yes Figure 3 A schematic diagram showing the state of the center door knife closing and contacting the landing door ball.

[0038] Figure 6 yes Figure 3 The diagram illustrates the state of unlocking using the manual unlock component.

[0039] Figure 7 yes Figure 1 A top view of the position of the third compression spring.

[0040] The components include: door knife 1, left blade 11, right blade 12, upper auxiliary arm 13, lower auxiliary arm 14, first compression spring 2, compression spring bracket 21, compression spring guide rod 22, base plate 3, power arm 31, rotating arm 32, lock hook 33, limit post 34, disc 35, connecting rope 36, conductive plug rod 37, third compression spring 38, track hole 39, interlocking hook 4, through hole 41, fixing hook 5, manual unlocking assembly 6, second compression spring 61, pull rope 62, snap-fit ​​component 63, self-locking hinge arm 7, left hinge arm 71, right hinge arm 72, roller 73, trigger component 74, limit protrusion 75, and conductive socket 8. Detailed Implementation

[0041] 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.

[0042] The elevator door operator (not shown in the attached diagram) typically includes a fixed plate, a left hanging plate, and a right hanging plate. The fixed plate is fixed to the elevator car, and the two car doors are fixedly connected to the left hanging plate and the right hanging plate, respectively. The left hanging plate and the right hanging plate move left and right along the fixed plate under the action of the drive device on the door operator. The left hanging plate and the right hanging plate move away simultaneously to open the car door, and move towards each other simultaneously to close the car door.

[0043] See Figures 1-7 This embodiment discloses an electric elevator door knife, including a door knife 1, a first compression spring 2, and a base plate 3. The door knife 1 includes a left blade 11 and a right blade 12. The base plate 3 is fixed to the left mounting plate of the door operator. A power arm 31 and a rotating arm 32 are coaxially rotatably mounted on the base plate 3 and are fixedly connected. The left blade 11 and the right blade 12 are both vertical and rotatably mounted on the rotating arm 32. When the rotating arm 32 rotates, it drives the left blade 11 and the right blade 12 to approach and separate from each other. The left and right ends of the first compression spring 2 are respectively connected to the left mounting plate of the door operator and the power arm 31.

[0044] In this invention, when the door knife 1 is closed, the door operator drives the power arm 31 and the rotating arm 32 to rotate counterclockwise. This causes the left blade 11 and the right blade 12, which are rotatably connected to the rotating arm 32, to move closer to each other while maintaining a vertical position. At the same time, the first compression spring 2 swings downward and compresses to a certain amount using its connection point with the left hanging plate of the door operator as a fulcrum, and then releases pressure to hold the power arm 31 in place, preventing it from rotating. Thus, the door knife 1 is closed. When the door knife 1 is opened, the door operator drives the power arm 31 and the rotating arm 32 to rotate clockwise. This causes the left blade 11 and the right blade 12 to move away from each other while maintaining a vertical position. At the same time, the first compression spring 2 swings upward and compresses to a certain amount, and then releases pressure to hold the power arm 31 in place, preventing it from rotating. Thus, the door knife 1 is opened. Therefore, through the action of the first compression spring 2, when the door operator is de-energized, the door knife 1 will maintain its previous closed or open state. Thus, when the door knife 1 is in the open state and the door operator is de-energized, the door knife 1 will not retract and close, reducing the risk of the door knife 1 colliding with the door ball on the elevator landing door due to the up and down movement of the car at this time. This reduces the risk of the safety circuit being disconnected due to the impact and the elevator failing to operate normally, thereby improving the safety of the elevator during operation.

[0045] See Figure 1 , Figure 2A locking hook 33 is rotatably mounted on the base plate 3. A hook 4 is engaged with the right end of the locking hook 33. The hook 4 is fixed to the right hanging plate of the door operator. A limiting post 34 is provided on the rear side of the locking hook 33. A fixing hook 5 is fixed on the fixing plate of the door operator. The limiting post 34 is engaged in the fixing hook 5. An inclined surface is provided on the left side of the fixing hook 5. When the limiting post 34 moves to the right and contacts the inclined surface of the fixing hook 5, it drives the limiting post 34 to move upward.

[0046] When the door operator drives the door knife 1 to move to the right to close the car door, the limiting post 34 on the locking hook 33 contacts the inclined surface of the fixed hook 5 and drives the locking hook 33 to rotate counterclockwise and lift upward through the guiding action of the inclined surface. When the limiting post 34 separates from the inclined surface, the locking hook 33 rotates clockwise to reset, so that the right end of the locking hook 33 is engaged in the interlocking hook 4 and the limiting post 34 is engaged in the fixed hook 5. At the same time, the locking hook 33 and the fixed hook 5 and the locking hook 33 and the interlocking hook 4 are engaged. Since the locking hook 33, the fixed hook 5 and the interlocking hook 4 are respectively fixed on the left hanging plate, the fixed plate and the right hanging plate of the door operator, the connection between the fixed plate and the hanging plate of the door operator is realized, which can prevent abnormal door opening.

[0047] See Figure 1 , Figure 6 A manual unlocking component 6 is provided between the base plate 3 and the locking hook 33. The manual unlocking component 6 includes a second compression spring 61, a pull rope 62, and a locking member 63. The locking member 63 is rotatably mounted on the base plate 3, and its upper end is locked onto the left end of the locking hook 33. The two ends of the second compression spring 61 abut against the locking member 63 and the base plate 3 respectively, and the second spring drives the locking member 63 to abut against the base plate 3. The pull rope 62 passes through the compression spring, and its upper end is fixedly connected to the locking member 63.

[0048] When the elevator car door needs to be opened manually, the pull rope 62 can be connected to the emergency door handle or lock hole on the car. When the handle is turned or the lock hole is turned with a specific key, the pull rope 62 is pulled down. The pull rope 62 drives the locking member 63 to rotate counterclockwise. At the same time, the locking member 63 drives the locking hook 33 to rotate counterclockwise, thereby disengaging the locking hook 33 from the fixed hook 5 and the interlocking hook 4. At this time, the car door can be pried open to both sides to realize the manual opening of the car door. Thus, the manual unlocking component 6 can effectively unlock the car door whether the door knife 1 is open or closed, improving the convenience of manual unlocking of the car door.

[0049] See Figure 1 , Figures 3-5 A disc 35 is fixed on the rotating arm 32, and a connecting rope 36 is wound around the disc 35. The two ends of the connecting rope 36 are respectively fixed to the power arm 31 and the locking hook 33.

[0050] When the gantry crane drives the power arm 31 and the rotating arm 32 to rotate counterclockwise, the disc 35 follows the power arm 31 and rotates along the rotation axis of the power arm 31. As a result, the distance between the disc 35 and the locking hook 33 gradually changes. The length of the connecting rope 36 is adapted to the change in distance between the disc 35 and the locking hook 33, so that when the disc 35 moves to a specific position in the middle of its trajectory (e.g., ...), ... Figure 5 As shown in the diagram, the disc 35 will pull the locking hook 33 counterclockwise through the connecting rope 36 to disengage the locking hook 33 from the fixed hook 5 and the mutual hook 4. At this time, the door operator can drive the car door to open. In addition, when the disc 35 is in other positions, the disc 35 will not pull the locking hook 33 to rotate through the connecting rope 36.

[0051] When the door operator drives the car door to open, it first drives the left blade 11 and right blade 12 to close. During this process, if the door blade 1 contacts the landing door's ball bearing (i.e., the car is in the unlocking area), the ball bearing is clamped between the left blade 11 and right blade 12, preventing them from fully closing. At this time, the power arm 31 and disc 35 are in the aforementioned specific positions, thus pulling the locking hook 33 counterclockwise via the connecting rope 36 to separate it from the fixed hook 5 and the interlocking hook 4. Then, the door operator opens the car door (e.g., ...). Figure 5 (as shown in the diagram); if the left blade 11 and right blade 12 do not contact the landing door's ball during the closing process, i.e., the car is in the non-unlocking area, the power arm 31 rotates to drive the left blade 11 and right blade 12 to fully close. At this point, the power arm 31 and disc 35 will rotate counterclockwise by a certain angle compared to the specific position mentioned above. This causes the locking hook 33 to rotate and reset, re-engaging with the fixed hook 5 and the interlocking hook 4. Therefore, the door operator cannot open the car door (as shown in the diagram). Figure 4 As shown in the diagram, this ensures that the car door cannot be opened when the car is in the unlocked area, thereby improving the safety of elevator use.

[0052] See Figure 1 , Figure 2 , Figure 4 A self-locking hinge arm 7 is provided between the upper end of the power arm 31 and the base plate 3. The left and right ends of the self-locking hinge arm 7 are respectively hinged to the power arm 31 and the base plate 3. The self-locking hinge arm 7 includes a left hinge arm 71 and a right hinge arm 72. The right end of the left hinge arm 71 is hinged to the left end of the right hinge arm 72. A roller 73 is coaxially rotatably provided on the rear side of the connection between the left hinge arm 71 and the right hinge arm 72. A trigger 74 is fixed on the fixed plate of the door operator. An inclined surface is provided on the left side of the trigger 74. When the roller 73 moves to the right and contacts the inclined surface of the trigger 74, it drives the roller 73 to move upward.

[0053] When the gantry crane drives the car door to open, the left blade 11 and right blade 12 close. At this time, the left hinge arm 71 and right hinge arm 72 rotate, causing the self-locking hinge arm 7 to gradually unfold until it is straightened. At this time, under the action of the first compression spring 2, the door blade 1 remains closed and the self-locking hinge arm 7 remains straightened. Then, when the gantry crane drives the car door to close, the left hanging plate moves to the right, so that the roller 73 also moves to the right and contacts the trigger 74. Under the guidance of the inclined surface of the trigger 74, the roller 73 moves up and down, driving the left hinge arm 71 and right hinge arm 72 to rotate and overlap, so that the power arm 31 rotates clockwise. The first compression spring 2, with its interaction with the trigger 74, causes the left hinge arm 71 and right hinge arm 72 to rotate and overlap, thus causing the power arm 31 to rotate clockwise. The connection point of the left hanging plate of the door operator swings upward and compresses to a certain amount, then releases pressure to drive the power arm 31 to continue rotating clockwise to open the door knife 1. Therefore, through the interaction of the self-locking hinge arm 7, the roller 73 and the trigger 74, the state of the first compression spring 2 is switched from keeping the door knife 1 closed to keeping the door knife 1 open, thereby ensuring that the door knife 1 is separated from the door ball of the landing door and ensuring the subsequent up and down movement of the car. At the same time, the mechanism of driving the power arm 31 and rotating arm 32 in the door operator can be simplified to a structure that only drives the power arm 31 and rotating arm 32 to rotate counterclockwise, thereby reducing the complexity of the door operator structure.

[0054] See Figure 1 The right hinge arm 72 is provided with a limiting protrusion 75. When the left hinge arm 71 and the right hinge arm 72 rotate and overlap to a certain angle, the left hinge arm 71 abuts against the limiting protrusion 75. This avoids the risk that if the left hinge arm 71 and the right hinge arm 72 rotate and overlap too much, the disc 35 will follow the power arm 31 and rotate clockwise along the rotation axis of the power arm 31 by too much angle, thereby pulling the connecting rope 36 and causing the locking hook 33 to rotate and separate from the fixed hook 5 and the mutual hook 4.

[0055] See Figure 1 An upper auxiliary arm 13 and a lower auxiliary arm 14 are provided between the left blade 11 and the right blade 12. The left and right ends of the upper auxiliary arm 13 are respectively hinged to the left blade 11 and the right blade 12, and the left and right ends of the lower auxiliary arm 14 are respectively hinged to the left blade 11 and the right blade 12, and the lower auxiliary arm 14 is slidably disposed in the track hole 39 on the base plate 3.

[0056] The left blade 11, right blade 12, upper auxiliary arm 13, and lower auxiliary arm 14 together form a parallelogram mechanism. The lower auxiliary arm 14 is connected to the base plate 3, so that the left blade 11 and right blade 12 can move closer to each other and further away while always maintaining a vertical position. This ensures that the left blade 11 and right blade 12 can move to the left and right sides of the landing door ball when moving up and down, thereby achieving the clamping effect on the ball and ensuring the function of opening the car door and landing door through the door operator.

[0057] See Figure 1 , Figure 2, Figure 5 A conductive plug 37 is fixed on the locking hook 33, and a conductive socket 8 is fixed on the fixing plate of the door operator. The conductive plug 37 and the left side of the conductive socket 8 are connected in an adaptive contact.

[0058] In the existing technology, the conductive contacts of the car door lock are mostly located on the upper side of the conductive socket 8. Dust accumulates on the conductive contacts, causing the door lock circuit to be blocked. Adding a dust cover to the conductive socket 8 is not very effective and greatly increases the failure rate of the car door lock door knife 1.

[0059] In this invention, by placing the conductive socket 8 vertically so that the conductive contact is located on the left side of the conductive socket 8, when the locking hook 33 rotates and engages with the fixing hook 5 and the interlocking hook 4, the conductive plug 37 makes contact with the conductive contact on the left side of the conductive socket 8 and makes electrical connection, thereby reducing the risk of different circuits caused by dust accumulation on the conductive contact and reducing the failure rate of the door knife 1.

[0060] See Figure 1 , Figure 2 , Figure 7 A third compression spring 38 is provided between the base plate 3 and the locking hook 33. The two ends of the third compression spring 38 abut against the base plate 3 and the locking hook 33 respectively, and the third compression spring 38 drives the right end of the locking hook 33 to rotate downward.

[0061] The third compression spring 38 ensures that the locking hook 33 can always be engaged with the fixed hook 5 and the interlocking hook 4 when there is no pulling action of the connecting rope 36 or the pull rope 62. This reduces the risk of accidental separation between the locking hook 33 and the fixed hook 5 and the interlocking hook 4 due to impact, shaking or rotational resistance at the connection between the locking hook 33 and the base plate 3, and improves the stability of the invention during use.

[0062] See Figure 1 The interlocking hook 4 has a through hole 41 for the protrusion of the locking hook 33 to be inserted, and the through hole 41 is an elongated strip in the left-right direction.

[0063] In this embodiment, the left and right length of the through hole 41 should not exceed 50mm, so that while keeping the locking hook 33 and the interlocking hook 4 engaged, the car door can be opened by external force by no more than 50mm, which complies with the opening requirements of the car door in section 5.3.15 of GB / T7588.1-2020. At the same time, it is also convenient for the protrusion of the locking hook 33 to be inserted into the through hole 41 within a certain range, thereby improving the stability of the engagement step between the locking hook 33 and the interlocking hook 4.

[0064] See Figure 3The first compression spring 2 is provided with a compression spring bracket 21 and a compression spring guide rod 22. The compression spring bracket 21 is rotatably mounted on the left hanging plate of the gantry crane. The compression spring guide rod 22 is inserted into the first compression spring 2. The left end of the compression spring guide rod 22 is slidably inserted into the compression spring bracket 21, and the right end of the compression spring guide rod 22 is hinged to the power arm 31.

[0065] When the first compression spring 2 swings upward or downward with its connection point with the left hanging plate of the gantry as the fulcrum, the compression spring guide rod 22 slides within the compression spring bracket 21. At the same time, the first compression spring 2 is first compressed and then relaxed, thus realizing the function of connecting the two ends of the first compression spring 2 to the left hanging plate of the gantry and the power arm 31 of the gantry through the compression spring bracket 21 and the compression spring guide rod 22 respectively. It also facilitates the installation of the first compression spring 2.

[0066] 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. An electric door knife for elevators, characterized in that: The device includes a door knife, a first compression spring, and a base plate. The door knife includes a left blade and a right blade. The base plate is fixed to the left mounting plate of the door operator. A power arm and a rotating arm are coaxially rotatably mounted on the base plate and are fixedly connected. The left blade and the right blade are both vertical and rotatably mounted on the rotating arm. When the rotating arm rotates, it drives the left blade and the right blade to approach and separate from each other. The left and right ends of the first compression spring are respectively connected to the left mounting plate of the door operator and the power arm. A self-locking hinge arm is provided between the upper end of the power arm and the base plate. The left and right ends of the self-locking hinge arm are respectively hinged to the power arm and the base plate. The self-locking hinge arm includes a left hinge arm and a right hinge arm. The right end of the left hinge arm is hinged to the left end of the right hinge arm. A roller is coaxially rotatably provided on the rear side of the connection between the left and right hinge arms. A trigger is fixed on the fixed plate of the door operator. An inclined surface is provided on the left side of the trigger. When the roller moves to the right and contacts the inclined surface of the trigger, it drives the roller to move upward.

2. The elevator electric door knife according to claim 1, characterized in that: A locking hook is rotatably mounted on the base plate, and an interlocking hook is engaged with the right end of the locking hook. The interlocking hook is fixed to the right hanging plate of the door operator. A limit post is provided on the rear side of the locking hook. A fixing hook is fixed on the fixing plate of the door operator. The limit post is engaged in the fixing hook. An inclined surface is provided on the left side of the fixing hook. When the limit post moves to the right and contacts the inclined surface of the fixing hook, it drives the limit post to move upward.

3. The elevator electric door knife according to claim 2, characterized in that: A manual unlocking assembly is provided between the base plate and the locking hook. The manual unlocking assembly includes a second compression spring, a pull rope, and a locking member. The locking member is rotatably mounted on the base plate, and its upper end is locked onto the left end of the locking hook. The two ends of the second compression spring abut against the locking member and the base plate respectively, and the second spring drives the locking member to abut against the base plate. The pull rope passes through the compression spring, and its upper end is fixedly connected to the locking member.

4. The elevator electric door knife according to claim 1, characterized in that: A disc is fixed on the rotating arm, and a connecting rope is wound around the disc. The two ends of the connecting rope are respectively fixed to the power arm and the locking hook.

5. The elevator electric door knife according to claim 1, characterized in that: An upper auxiliary arm and a lower auxiliary arm are provided between the left and right blades. The left and right ends of the upper auxiliary arm are respectively hinged to the left and right blades, and the left and right ends of the lower auxiliary arm are respectively hinged to the left and right blades and are slidably disposed in the track hole on the base plate.

6. The elevator electric door knife according to claim 2, characterized in that: A conductive rod is fixed on the lock hook, and a conductive socket is fixed on the fixing plate of the door operator. The conductive rod and the left side of the conductive socket are connected for electrical communication.

7. The elevator electric door knife according to claim 2, characterized in that: A third compression spring is provided between the base plate and the locking hook. The two ends of the third compression spring abut against the base plate and the locking hook respectively, and the third compression spring drives the right end of the locking hook to rotate downward.

8. The elevator electric door knife according to claim 2, characterized in that: The interlocking hook has a through hole for inserting the protrusion of the locking hook, and the through hole is an elongated strip in the left-right direction.

9. The elevator electric door knife according to claim 4, characterized in that: The first compression spring is provided with a compression spring bracket and a compression spring guide rod. The compression spring bracket is rotatably mounted on the left hanging plate of the gantry crane. The compression spring guide rod is inserted into the first compression spring. The left end of the compression spring guide rod is slidably inserted into the compression spring bracket, and the right end of the compression spring guide rod is hinged to the power arm.

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