Car-mounted speed limiter and elevator

Abstract

The present application relates to a kind of car follow-up speed limiter and elevator, car follow-up speed limiter includes rope wheel and pull swing rod, rope wheel is driven by steel wire rope being arranged in vertical direction, rotatably mounted with action cam on the wheel shaft of rope wheel, and centrifugal mechanism is arranged on rope wheel, which makes rope wheel and action cam rotate together when the rotating speed of rope wheel is greater than predetermined value;Pull swing rod is rotated and driven by action cam to produce rotation to act safety tongs, and the nearby of pull swing rod is equipped with locking mechanism, which locks and releases the position after rotation;It also includes cam reset mechanism.The car follow-up speed limiter and elevator designed in the present application, by integrating speed limiter on car and using improved reset mode, effectively shortens the length of speed limiting steel wire rope, improves the response speed of speed limiter, so as to improve the safety of elevator operation;At the same time, it reduces the manufacturing cost, installation and maintenance cost of speed limiter, and improves reliability and space integration.

Description

Technical Field

[0001] This invention relates to the technical field of elevator mechanical speed limiting protection devices, and in particular to a car frame follow-up speed limiter and an elevator. Background Technology

[0002] In existing technology, the elevator speed governor is an important device to ensure the safe operation of the elevator. Its function is to trigger the safety clamp when the elevator speed exceeds the set value, so as to stop the elevator and prevent a fall accident.

[0003] Traditional elevator speed governors are typically installed in the machine room or at the top of the shaft, connected to the car via a steel cable. This installation method has several drawbacks: First, due to the considerable distance between the speed governor and the car, and the length of the steel cable, signal transmission time is prolonged, resulting in a relatively slow response speed of the safety brake. In emergency situations involving elevator overspeed, this may increase the risk of accidents. Second, the longer steel cable increases material costs, and the installation process is also more complex, requiring additional space and increasing overall installation costs.

[0004] For example, in the elevator speed governor car frame installation structure with application number CN202223396965.6, the limit rail is connected to the speed governor, the limit rail is installed on the elevator car frame, the speed governor is located between the limit rails, the speed governor is connected to the wire rope tensioning device through the speed governor wire rope, the speed governor is connected to the safety gear linkage, and the safety gear linkage is connected to the safety gear. Although the above solution solves the problem of slow safety gear response speed, it still has the following drawbacks: there is no speed governor trigger holding and reset device, and the integration is low. Summary of the Invention

[0005] To address the aforementioned issues, this invention provides a car frame follow-up speed limiter and elevator that achieves faster response, lower cost, higher reliability, and better space utilization.

[0006] To achieve the above objectives, in a first aspect, embodiments of this application provide a car frame follow-up speed limiter, including a rope pulley and a lifting lever. The rope pulley is driven by a steel wire rope arranged in a vertical direction. An actuation cam is rotatably mounted on the axle of the rope pulley. The rope pulley is provided with a centrifugal mechanism that causes the rope pulley and the actuation cam to rotate together when the rotational speed of the rope pulley is greater than a predetermined value. The lifting lever is driven by the rotation of the actuation cam to generate rotation to activate the safety clamp. A locking mechanism for locking and releasing its rotated position is provided near the lifting lever. The device also includes a cam reset mechanism, which includes: a reset cam coaxially arranged with the actuation cam and with a gradually decreasing radius; a reset push rod mounted on the side of the actuation cam and abutting against the cam surface of the reset cam; and a cam reset spring mating with the reset push rod. The cam reset spring is used to generate a tangential force to drive the actuation cam to rotate and reset when the actuation cam does not rotate synchronously with the rope pulley.

[0007] To increase the friction between the wire rope and the sheave, at least one tensioner is also included, with the wire rope wound around the sheave and the tensioner.

[0008] To reliably lock and release the lifting lever, the locking mechanism includes an electric drive device, a first locking member, and a second locking member located at one end of the lifting lever. A locking return spring is provided on one side of the first locking member for pulling the first locking member to a first position. When the second locking member rotates to the first position, it engages with the first locking member. The electric drive device is used to drive the first locking member to move to release the engagement with the second locking member.

[0009] To enable simple and effective reset of the lifting lever, a lever reset spring is provided on the lifting lever for pulling the lifting lever to rotate to the second position. When the actuation cam rotates to the second position, it contacts the lifting lever to drive the lifting lever to rotate from the second position to the first position.

[0010] To reduce frictional resistance and improve reset accuracy, the contact end between the reset push rod and the reset cam is an arc surface or a roller structure.

[0011] A further embodiment is that a guide bracket is installed on the side of the action cam, and the reset push rod is slidably mounted on the guide bracket along the radial direction of the reset cam. One end of the reset push rod is provided with a backstop, and the other end abuts against the cam surface of the reset cam through the cam reset spring.

[0012] To facilitate communication with the elevator's control system, an electrical switch located along the movement path of the actuating cam is also included. This electrical switch is triggered when the actuating cam rotates and before the lifting lever actuates.

[0013] To improve the sensitivity and reliability of the speed limiter, the centrifugal mechanism includes at least one pair of centrifugal slings, which extend radially outward under centrifugal force and engage with pawls on the actuating cam.

[0014] To reset the centrifugal block, a centrifugal reset spring connected to a rope wheel is provided on the centrifugal block, which is used to reset the centrifugal block when the speed of the rope wheel is less than a predetermined value; the rope wheel has multiple mounting holes, and one end of the centrifugal reset spring can be selectively fixed to any one of the mounting holes by a fastener.

[0015] Secondly, embodiments of this application provide an elevator, including the car frame follow-up speed limiter described in any embodiment of the first aspect.

[0016] The car frame follow-up speed governor and elevator designed in this invention effectively shorten the length of the speed governor wire rope and improve the speed governor's response speed by integrating the speed governor onto the car and adopting an improved reset method, thereby enhancing the elevator's operational safety. Simultaneously, it reduces the speed governor's manufacturing and installation / maintenance costs, while improving reliability and spatial integration. The improved reset method utilizes a variable-diameter reset cam with a gradually decreasing radius, in conjunction with a reset push rod and a reset spring, to more effectively control the reset process of the actuating cam. This avoids problems such as jamming or incomplete reset that may occur with traditional reset mechanisms, further improving the speed governor's reliability and stability. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the car frame follow-up speed limiter provided in the embodiments of this application. Figure 1 .

[0018] Figure 2 This is a schematic diagram of the structure of the car frame follow-up speed limiter provided in the embodiments of this application. Figure 2 .

[0019] Figure 3 This is a schematic diagram of the installation of the car frame follow-up speed limiter provided in the embodiment of this application.

[0020] Figure 4 This is a schematic diagram of the installation of the action cam and reset push rod provided in the embodiments of this application.

[0021] Figure 5 This is a schematic diagram of the centrifuge mechanism provided in the embodiments of this application.

[0022] Figure 6 This is a schematic diagram of the arrangement of the rope pulley, tension pulley, and wire rope provided in the embodiments of this application.

[0023] The components include: rope pulley 10, wheel axle 11, lifting swing arm 20, swing arm return spring 21, wire rope 30, actuating cam 40, guide bracket 41, electrical switch 42, second mounting bracket 421, pawl 43, centrifugal mechanism 50, centrifugal throwing block 51, centrifugal return spring 52, locking mechanism 60, electric drive device 61, first mounting bracket 611, first locking element 62, second locking element 63, locking return spring 64, cam return mechanism 70, return cam 71, return push rod 72, anti-reverse part 721, cam return spring 73, tension wheel 80, outer shell 100, first hole 101, second hole 102, first shaft 103, second shaft 104, and third shaft 105. Detailed Implementation

[0024] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0025] The car frame follow-up speed limiter provided in this application embodiment is mainly used in elevators. It is designed to activate the safety brake in a timely manner when the elevator overspeeds, so as to stop the elevator from running and thus effectively prevent falling accidents.

[0026] like Figure 1 As shown, in a first aspect, embodiments of this application provide a car frame follow-up speed limiter, including a pulley 10 and a lifting lever 20, wherein the pulley 10 is driven by a steel wire rope 30 arranged in a vertical direction. In specific implementations, such as... Figure 3 , Figure 6 As shown, the car frame follow-up speed limiter is integrated into a housing 100, which is fixedly installed on the car frame of the elevator car by bolts and other fasteners, and moves synchronously with the car in the elevator shaft.

[0027] The pulley 10 has an actuation cam 40 rotatably mounted on its axle 11. The pulley 10 is equipped with a centrifugal mechanism 50 that causes the pulley 10 and the actuation cam 40 to rotate together when the pulley 10's rotational speed exceeds a predetermined value. The lifting lever 20 is driven by the rotation of the actuation cam 40 to rotate and activate the safety clamp. A locking mechanism 60 is located near the lifting lever 20 to lock and release its rotated position. The pulley 20 also includes a cam reset mechanism 70, comprising: a reset cam 71 coaxially arranged with the actuation cam 40 and with a gradually decreasing radius; a reset push rod 72 mounted on the side of the actuation cam 40 and abutting against the cam surface of the reset cam 71; and a cam reset spring 73 mating with the reset push rod 72. The cam reset spring 73 generates a tangential force to drive the actuation cam 40 to rotate and reset when the actuation cam 40 does not rotate synchronously with the pulley 10.

[0028] In specific implementation, a first hole 101 is provided on the side wall of the outer casing 100 for the lifting lever 20 to extend out; a second hole 102 is provided on the top and bottom walls of the outer casing 100 for the steel wire rope 30 to pass through; the lifting lever 20 is rotatably mounted inside the outer casing 100 via a first shaft 103, and one end of the lifting lever 20 extending out of the first hole 101 is connected to the lifting arm of the safety clamp, so that the lifting lever 20 can drive the safety clamp to move when it rotates. This integrated design encapsulates all components within the outer casing 100, making the speed governor an independent module, which is easy to integrate with the elevator car, greatly simplifies the installation process, and reduces modifications to the car structure, thereby saving time and costs. At the same time, the outer casing 100 can support the internal parts to withstand the forces generated when the speed governor is activated. In addition, the outer casing 100 also provides effective protection for the various components of the speed governor, that is, it can prevent the influence of dust, moisture and other environmental or other unexpected factors, ensuring that the speed governor can work stably in harsh environments, thereby improving the reliability and service life of the speed governor.

[0029] In one embodiment, one end of the lifting lever 20 is connected to the lifting arm of the safety clamp via a pin; in another embodiment, one end of the lifting lever 20 is connected to the lifting arm of the safety clamp via a lifting rod. Regardless of the connection method, the lifting lever 20 can effectively drive the safety clamp, ensuring that the elevator stops quickly when overspeeding.

[0030] During normal elevator operation, the outer casing 100, along with the car frame and its internal speed governor, moves up or down with the elevator car. The pulley 10 rotates driven by the wire rope 30. When the elevator experiences downward overspeed, the wire rope 30 drives the pulley 10 to rotate at an even faster speed until the pulley 10's rotational speed exceeds a predetermined value. At this point, the centrifugal mechanism 50 activates. For example, under centrifugal force, the centrifugal block gradually opens at a certain angle and hooks the pawl on the actuating cam 40, causing the pulley 10 to drive the actuating cam 40 to rotate synchronously. As the pulley 10 and the actuating cam 40 rotate synchronously, the actuating cam 40 strikes the lifting lever 20, driving the lifting lever 20 to rotate, thereby triggering the safety brake. In this way, the overspeed protection mechanism is completed through the interaction between the lifting lever 20 and the actuating cam 40, ensuring that the elevator can stop quickly. The locking mechanism 60, located near the lifting lever 20, can lock the safety brake after the lifting lever 20 rotates, thus maintaining the safety brake's triggered state and ensuring that the elevator can effectively stop the car. If necessary, such as when the elevator resumes normal operation after stopping, the locking mechanism 60 can also release the lifting lever 20 to reset it.

[0031] like Figure 1 , Figure 2As shown, the reset cam 71 of the cam reset mechanism 70 is coaxially arranged with the actuating cam 40. Specifically, it can be mounted on the wheel axle 11 and is non-rotatable. Its reset push rod 72 always maintains contact with the cam surface of the reset cam 71, and this contact state is maintained stably under the action of the reset spring 73. When the elevator car is stopped, the centrifugal mechanism 50 no longer functions, and the rotation of the actuating cam 40 and the pulley 10 is no longer synchronized. The reset push rod 72 contacts the cam surface of the reset cam 71. At this time, as the radius of the reset cam 71 gradually decreases, the tangential force applied by the reset spring 73 begins to take effect, pushing the reset push rod 72, so that the actuating cam 40 resets along the cam profile of the reset cam 71, so that the elevator safety protection function can continue to be performed.

[0032] In summary, integrating the speed governor onto the elevator car frame effectively reduces the length of the wire rope by 30, greatly reducing the complexity of the mechanical system. Furthermore, by reducing unnecessary transmission components, the speed governor's response speed is improved. This means that when the elevator overspeeds, the speed governor can activate and operate more quickly, ensuring that the safety brake can be triggered in time, thereby effectively stopping the elevator and reducing the risks that may be caused by overspeeding.

[0033] In some embodiments, such as Figure 1 , Figure 2 , Figure 6 As shown, it also includes at least one tensioning pulley 80, with the wire rope 30 wound around the pulley 10 and the tensioning pulley 80.

[0034] In practice, the tensioner 80 is installed inside the housing 100 via the second shaft 104. The tensioner 80 effectively adjusts the tension of the wire rope 30, ensuring sufficient contact pressure between the wire rope 30 and the pulley 10, thus preventing the wire rope 30 from becoming too slack or too tight. Specifically, the wire rope 30 wraps around the pulley 10 and passes through the tensioner 80, forming a wrap angle on the pulley 10. This wrap angle design increases the contact area between the wire rope 30 and the pulley 10, significantly improving the friction between them. This enhanced friction helps ensure that the wire rope 30 transmits driving force more securely, reducing the possibility of slippage or slippage. The enhanced friction also makes the transmission of motion more sensitive, thereby accelerating the start-up speed of the speed governor. When the elevator overspeeds, the speed governor can respond more quickly, triggering the safety brake in time to ensure the elevator is safely stopped.

[0035] Furthermore, the tensioner 80 ensures sufficient contact pressure between the wire rope 30 and the sheave 10, thus firmly suspending the entire speed governor on the wire rope 30. This means that the portion of the wire rope 30 that passes over the sheave 10 and tensioner 80 and connects to the top of the shaft is always taut. This implies that even if the tensioning device at the bottom of the wire rope 30 fails, the speed governor can still continue to function normally, ensuring that even in the event of a tensioning device or other system failure, the speed governor can still play its role and guarantee the safety of the elevator in the event of overspeed.

[0036] In some embodiments, such as Figure 1 , Figure 2 As shown, the locking mechanism 60 includes an electric drive device 61, a first locking member 62, and a second locking member 63 located at one end of the lifting lever 20. A locking return spring 64 is provided on one side of the first locking member 62 for pulling the first locking member 62 to a first position. When the second locking member 63 rotates to the first position, it engages with the first locking member 62. The electric drive device 61 is used to drive the first locking member 62 to move in order to release the engagement with the second locking member 63.

[0037] In practice, the first locking member 62 is installed inside the housing 100 via the third shaft 105, and the other end of the locking return spring 64 is fixed to the inner wall of the housing 100. The first locking member 62 and the second locking member 63 are engaged, reliably locking the position of the lifting lever 20 after the rotational safety clamp, ensuring that the lifting lever 20 remains in the correct position and preventing accidental unlocking due to external vibration or other unexpected interference. This structure effectively ensures the stability of the lifting lever when performing overspeed protection; while the electric drive device 61 is used to drive the first locking member 62 when needed, releasing its engagement with the second locking member 63, allowing the lifting lever 20 to return to its initial state or perform other operations. In addition, when the first locking member 62 is driven by the electric drive device 61 to release its engagement with the second locking member 63, the locking return spring 64 helps the first locking member 62 swing around the third shaft 105, automatically returning to the appropriate position of the locked state, ready to engage with the second locking member 63 again. Ensure that the speed limiter can reliably recover after each overspeed protection operation, preparing it for the next use and avoiding operational errors or safety hazards caused by jamming or failure.

[0038] In one embodiment, the electric drive unit 61 employs an electromagnet push-pull mechanism. Specifically, the electric drive unit 61 is mounted inside the housing 100 via a first mounting bracket 611 and communicates with the elevator's control system. When unlocking is required, the elevator's control system controls the current to the electromagnet, generating a magnetic force to disengage the engagement between the first locking member 62 and the second locking member 63. This operation ensures that the lifting lever 20 can quickly return to its initial position and is ready to execute new overspeed protection when needed.

[0039] In some embodiments, such as Figure 2 As shown, the lifting lever 20 is equipped with a lever return spring 21 for pulling the lifting lever 20 to the second position. When the actuating cam 40 rotates to the second position, it contacts the lifting lever 20 to drive the lifting lever 20 to rotate from the second position to the first position. In specific implementation, one end of the lever return spring 21 is fixed to the inner wall of the housing 100, and the other end is connected to the lifting lever 20. Through the restoring force applied by the lever return spring 21, when the first locking member 62 is released from its engagement with the second locking member 63, the spring automatically pulls the lifting lever 20 back to the second position. Compared with manual operation or complex mechanical devices, using a spring as a reset mechanism is simpler and more efficient, reduces the complexity of mechanical components, improves the reliability of the system, and ensures that the system can quickly and accurately return to the predetermined state after each operation.

[0040] In some embodiments, such as Figure 4 As shown, the contact end between the reset push rod 72 and the reset cam 71 is an arc surface or a roller structure. In this embodiment, the arc surface or roller design makes the contact surface between the reset push rod 72 and the reset cam 71 smoother, avoiding jamming or instability caused by sharp angles or irregular contact surfaces. In other words, using an arc surface or roller structure can effectively reduce the friction when the reset push rod 72 contacts the reset cam 71, ensuring that the reset push rod 72 can move accurately and smoothly along the trajectory of the reset cam 71 during the reset process, improving the reset accuracy and ensuring that each reset reaches the predetermined position.

[0041] In some embodiments, such as Figure 2 , Figure 4 As shown, a guide bracket 41 is mounted on the side of the actuating cam 40. The reset push rod 72 is slidably mounted on the guide bracket 41 along the radial direction of the reset cam 71. One end of the reset push rod 72 is provided with a stop part 721, and the other end abuts against the cam surface of the reset cam 71 through a cam reset spring 73. The reset push rod 72 slides through the guide bracket 41 and, in conjunction with the action of the cam reset spring 73, ensures that the reset push rod 72 moves stably along the trajectory of the reset cam 71 during the reset process, avoiding operation delays or failures due to jamming or excessive resistance.

[0042] In some embodiments, such as Figure 1 , Figure 2As shown, it also includes an electrical switch 42 located along the movement path of the actuating cam 40. The electrical switch 42 is triggered when the actuating cam 40 rotates and acts before the lifting lever 20. In a specific implementation, the electrical switch 42 is fixedly installed inside the housing 100 via a second mounting bracket 421 and can communicate with the elevator's control system. The electrical switch 42 provides real-time feedback on the state of the actuating cam 40, enabling the elevator control system to promptly obtain information about the speed governor's operation, such as whether overspeed protection has been triggered. Based on this real-time information, the elevator control system can respond immediately, for example, by instructing the traction machine to stop rotating to prevent the elevator from continuing to operate.

[0043] In some embodiments, such as Figure 1 , Figure 2 , Figure 5 As shown, the centrifugal mechanism 50 includes at least one pair of centrifugal blocks 51. Under the action of centrifugal force, the centrifugal blocks 51 extend radially outward and engage with the pawl 43 on the actuation cam 40. With this structural design, when the elevator experiences downward overspeed, under the action of centrifugal force, the centrifugal blocks 51 gradually extend outward and engage with the pawl 43 on the actuation cam 40, pushing the pulley 10 and the actuation cam 40 to rotate together, thereby triggering the speed limiter to operate.

[0044] In this embodiment, as Figure 5 As shown, the centrifugal swing block 51 is equipped with a centrifugal return spring 52 connected to the pulley 10, used to reset the centrifugal swing block 51 when the rotational speed of the pulley 10 is less than a predetermined value. In this embodiment, the centrifugal return spring 52 is a simple mechanical component. When the elevator running speed returns to the normal level, the rotational speed of the pulley 10 decreases, and the centrifugal force of the centrifugal swing block 51 weakens accordingly. The centrifugal return spring 52 automatically pulls the centrifugal swing block 51 back to its initial position by providing a restoring force. In this way, the reset centrifugal swing block 51 is ready to trigger the next overspeed protection. In addition, as Figure 5 As shown, the pulley 10 has multiple mounting holes, and one end of the centrifugal return spring 52 can be selectively fixed to any one of the mounting holes by a fastener. In this way, the centrifugal return spring 52 can be installed in different mounting holes to adjust its length, and thus adjust the elastic force to regulate the trigger speed of the speed limiter.

[0045] Secondly, embodiments of this application provide an elevator, including a car frame follow-up speed limiter according to any embodiment of the first aspect.

[0046] The car frame follow-up speed governor and elevator provided in this embodiment effectively shorten the length of the speed governor wire rope and improve the speed governor's response speed by integrating the speed governor onto the car and adopting an improved reset method, thereby enhancing the elevator's operational safety. Simultaneously, it reduces the speed governor's manufacturing and installation / maintenance costs, while improving reliability and spatial integration. The improved reset method utilizes a variable-diameter reset cam with a gradually decreasing radius, in conjunction with a reset push rod and a reset spring, to more effectively control the reset process of the action cam. This avoids problems such as jamming or incomplete reset that may occur with traditional reset mechanisms, further improving the speed governor's reliability and stability.

[0047] In the description of this invention, it should be noted that the terms "vertical," "upper," "lower," "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0048] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0049] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A car frame follow-up speed limiter, comprising a pulley and a lifting lever, wherein the pulley is driven by a steel wire rope arranged in a vertical direction, characterized in that, An actuating cam is rotatably mounted on the axle of the rope pulley. The rope pulley is equipped with a centrifugal mechanism that causes the rope pulley and the actuating cam to rotate together when the rope pulley's rotational speed exceeds a predetermined value. The lifting lever is driven by the rotation of the actuating cam to activate the safety clamp, and a locking mechanism is provided near the lifting lever to lock and release its rotated position. The system also includes a cam reset mechanism, comprising: a reset cam coaxially arranged with the actuating cam and with a gradually decreasing radius; a reset push rod mounted on the side of the actuating cam and abutting against the cam surface of the reset cam; and a cam reset spring mating with the reset push rod. The cam reset spring generates a tangential force to drive the actuating cam to rotate and reset when the actuating cam does not rotate synchronously with the rope pulley.

2. The car frame follow-up speed limiter according to claim 1, characterized in that, It also includes at least one tensioner, with the wire rope wound around the sheave and the tensioner.

3. The car frame follow-up speed limiter according to claim 1, characterized in that, The locking mechanism includes an electric drive device, a first locking member, and a second locking member disposed at one end of the lifting lever. A locking return spring is provided on one side of the first locking member for pulling the first locking member to a first position. When the second locking member rotates to the first position, it engages with the first locking member. The electric drive device is used to drive the first locking member to move in order to release the engagement with the second locking member.

4. The car frame follow-up speed limiter according to claim 1, characterized in that, The lifting lever is provided with a lever return spring for pulling the lifting lever to rotate to the second position. When the actuation cam rotates to the second position, it contacts the lifting lever to drive the lifting lever to rotate from the second position to the first position.

5. The car frame follow-up speed limiter according to claim 1, characterized in that, The contact end between the reset push rod and the reset cam is an arc surface or a roller structure.

6. The car frame follow-up speed limiter according to claim 1, characterized in that, A guide bracket is mounted on the side of the actuating cam. The reset push rod is slidably mounted on the guide bracket along the radial direction of the reset cam. One end of the reset push rod is provided with a backstop part, and the other end abuts against the cam surface of the reset cam through the cam reset spring.

7. The car frame follow-up speed limiter according to claim 1, characterized in that, It also includes an electrical switch located in the motion path of the action cam, which is triggered when the action cam rotates and before the lifting lever moves.

8. The car frame follow-up speed limiter according to claim 1, characterized in that, The centrifugal mechanism includes at least one pair of centrifugal slings, which extend radially outward under centrifugal force and engage with pawls on the actuating cam.

9. The car frame follow-up speed limiter according to claim 8, characterized in that, The centrifugal swing block is equipped with a centrifugal return spring connected to a rope wheel, which is used to reset the centrifugal swing block when the speed of the rope wheel is less than a predetermined value; the rope wheel has multiple mounting holes, and one end of the centrifugal return spring can be selectively fixed to any one of the mounting holes by a fastener.

10. An elevator, characterized in that, Includes the car frame follow-up speed limiter as described in any one of claims 1-9.

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