Car frame follow-up speed limiter and elevator

Abstract

The invention relates to a car frame follow-up speed limiter and an elevator, the car frame follow-up speed limiter comprises a rope wheel and a lifting swing rod, the rope wheel is driven by a steel wire rope arranged in the vertical direction, and an action cam is rotatably mounted on a wheel shaft of the rope wheel; the rope wheel is provided with a centrifugal mechanism which enables the rope wheel and the action cam to rotate together when the rotating speed of the rope wheel is larger than a preset value. The lifting swing rod is driven by rotation of the action cam to rotate so as to act the safety tongs, and a locking mechanism for locking and releasing the position of the lifting swing rod after rotation is arranged nearby the lifting swing rod. The device further comprises a cam reset mechanism. According to the car frame follow-up speed limiter and the elevator, the speed limiter is integrated on the car, an improved reset mode is adopted, the length of a speed limiting steel wire rope is effectively shortened, the response speed of the speed limiter is increased, and therefore the operation safety of the elevator is improved; and meanwhile, the manufacturing cost and the installation and maintenance cost of the speed governor are reduced, and the reliability and the space integration are improved.

Description

Technical Field

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

[0002] In the prior art, the elevator speed limiter is an important device to ensure the safe operation of the elevator. Its function is to trigger the safety clamp to stop the elevator when the elevator speed exceeds the set value to prevent a fall accident.

[0003] Traditional elevator speed limiters are usually installed in the machine room or on the top of the shaft, and connected to the car through a wire rope. This installation method has some disadvantages: first, due to the long distance between the speed limiter and the car and the long wire rope, the signal transmission time is long and the safety clamp's response speed is relatively slow. In the emergency situation of elevator overspeed, this may increase the risk of accidents; second, the long wire rope increases the material cost, and the installation process is also more complicated, requiring additional space and increasing the installation cost.

[0004] For example, an elevator speed limiter car frame mounting structure with application number CN202223396965.6, a limit rail is connected to the speed limiter, the limit rail is installed on the elevator car frame, the speed limiter is arranged between the limit rails, the speed limiter is connected to the wire rope tensioning device through the speed limiter wire rope, the speed limiter is connected to the safety clamp connecting rod, and the safety clamp connecting rod is connected to the safety clamp. Although the above scheme solves the problem of slow response speed of the safety clamp, it still has the following disadvantages: there is no speed limiter trigger holding and resetting device, and the integration is low. Summary of the invention

[0005] In order to solve the above problems, the present invention provides a car frame follow-up speed governor and an elevator which achieve faster response, lower cost, higher reliability and better space utilization.

[0006] In order to achieve the above-mentioned objectives, in the first aspect, an embodiment of the present application provides a car frame follow-up speed limiter, including a pulley and a lifting and pulling rocker arm, the pulley is driven by a steel wire rope arranged in a vertical direction, an action cam is rotatably mounted on the wheel axle of the pulley, and the pulley is provided with a centrifugal mechanism for causing the pulley and the action cam to rotate together when the rotation speed of the pulley is greater than a predetermined value; the lifting and pulling rocker arm is driven by the action cam to rotate to actuate the safety clamp, and a locking mechanism for locking and releasing its rotated position is provided near the lifting and pulling rocker arm; it also includes a cam reset mechanism, the cam reset mechanism including: a reset cam coaxially arranged with the action cam and with a gradually decreasing radius, a reset push rod installed on the side of the action cam and abutting against the cam surface of the reset cam, and a cam reset spring matched with the reset push rod; the cam reset spring is used to generate a tangential force driving the action cam to rotate and reset when the action cam does not rotate synchronously with the pulley.

[0007] In order to increase the friction between the steel wire rope and the rope wheel, at least one tension wheel is also included, and the steel wire rope is wound around the rope wheel and the tension wheel.

[0008] In order to reliably lock and release the lifting and pulling rocker arm, the locking mechanism includes an electric drive device, a first locking member and a second locking member arranged at one end of the lifting and pulling rocker arm. One side of the first locking member is provided with a locking return spring for pulling the first locking member to swing to the first position. When the second locking member is rotated to the first position, it is engaged and connected with the first locking member. The electric drive device is used to drive the first locking member to move to release the engaged connection with the second locking member.

[0009] In order to simply and effectively reset the lifting and pulling rocker arm, the lifting and pulling rocker arm is provided with a rocker arm reset spring for pulling the lifting and pulling rocker arm to swing to the second position. When the action cam rotates to the second position, it contacts the lifting and pulling rocker arm to drive the lifting and pulling rocker arm to rotate from the second position to the first position.

[0010] In order to reduce friction resistance and improve reset accuracy, the contact end between the reset push rod and the reset cam is an arc surface or roller structure.

[0011] A further solution is that a guide bracket is installed on the side of the action cam, and the reset push rod can be slidably arranged on the guide bracket along the radial direction of the reset cam, and one end of the reset push rod is provided with a stop portion, and the other end abuts against the cam surface of the reset cam through the cam reset spring.

[0012] In order to communicate with the control system of the elevator, an electrical switch is also included in the movement path of the action cam. The electrical switch is triggered when the action cam rotates and moves before the lifting swing rod.

[0013] In order to improve the sensitivity and reliability of the speed limiter, the centrifugal mechanism includes at least one pair of centrifugal throwing masses, which extend radially outward under the action of centrifugal force and engage with ratchet pawls on the action cam.

[0014] In order to reset the centrifugal weight, a centrifugal reset spring connected to a rope pulley is provided on the centrifugal weight, which is used to reset the centrifugal weight when the rope pulley rotation speed is less than a predetermined value; a plurality of mounting holes are provided on the rope pulley, and one end of the centrifugal reset spring can be selectively fixed to any one of the mounting holes by a fastener.

[0015] In a second aspect, an embodiment of the present application provides an elevator, comprising the car frame follow-up speed limiter described in any embodiment of the first aspect.

[0016] The car frame follow-up speed limiter and elevator designed by the present invention integrate the speed limiter on the car and adopt an improved resetting method, thereby effectively shortening the length of the speed limiting steel wire rope and improving the response speed of the speed limiter, thereby improving the safety of elevator operation; at the same time, the manufacturing cost and installation and maintenance cost of the speed limiter are reduced, and the reliability and space integration are improved. The improved resetting method utilizes the cooperation of a variable-diameter resetting cam with a gradually decreasing radius and a resetting push rod and a resetting spring, which can more effectively control the resetting process of the action cam, avoids the problems of sticking or inadequate resetting that may occur in a traditional resetting mechanism, thereby further improving the reliability and stability of the speed limiter. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the structure of the car frame follow-up speed limiter provided in the embodiment of the present 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 embodiment of the present application. Figure 2 .

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

[0020] Figure 4 It is a schematic diagram of the installation of the action cam and the reset push rod provided in the embodiment of the present application.

[0021] Figure 5 It is a structural schematic diagram of the centrifugal mechanism provided in the embodiment of the present application.

[0022] Figure 6 It is a schematic diagram of the arrangement of the rope pulley, tensioner pulley and wire rope provided in an embodiment of the present application.

[0023] Among them: the rope wheel 10, the wheel axle 11, the lifting rocker 20, the rocker reset spring 21, the wire rope 30, the action cam 40, the guide bracket 41, the electrical switch 42, the second mounting bracket 421, the pawl 43, the centrifugal mechanism 50, the centrifugal swing block 51, the centrifugal reset spring 52, the locking mechanism 60, the electric drive device 61, the first mounting bracket 611, the first locking member 62, the second locking member 63, the locking reset spring 64, the cam reset mechanism 70, the reset cam 71, the reset push rod 72, the stop part 721, the cam reset spring 73, the tensioner 80, the housing 100, the first hole 101, the second hole 102, the first shaft 103, the second shaft 104, and the third shaft 105. DETAILED DESCRIPTION

[0024] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0025] The car frame follow-up speed limiter provided in the embodiment of the present application is mainly used in elevators, and is intended to promptly actuate the safety clamp to stop the elevator when the elevator is overspeeding, thereby effectively preventing a fall accident.

[0026] like Figure 1 As shown, in the first aspect, the embodiment of the present application provides a car frame follow-up speed limiter, including a rope wheel 10 and a lifting swing rod 20, and the rope wheel 10 is driven by a steel wire rope 30 arranged in a vertical direction. Figure 3 , Figure 6 As shown, the car frame follower speed limiter is integrated in a housing 100, and the housing 100 is fixedly mounted on the car frame of the elevator car by fasteners such as bolts, and moves synchronously with the car in the elevator shaft.

[0027] Among them, an action cam 40 is rotatably mounted on the wheel axle 11 of the rope pulley 10, and a centrifugal mechanism 50 is provided on the rope pulley 10 for making the rope pulley 10 and the action cam 40 rotate together when the rotation speed of the rope pulley 10 is greater than a predetermined value; the lifting and pulling swing rod 20 is driven by the action cam 40 to rotate to actuate the safety clamp, and a locking mechanism 60 is provided near the lifting and pulling swing rod 20 for locking and releasing its rotated position; it also includes a cam reset mechanism 70, and the cam reset mechanism 70 includes: a reset cam 71 which is coaxially arranged with the action cam 40 and has a gradually decreasing radius, a reset push rod 72 which is installed on the side of the action cam 40 and abuts against the cam surface of the reset cam 71, and a cam reset spring 73 matched with the reset push rod 72; the cam reset spring 73 is used to generate a tangential force to drive the action cam 40 to rotate and reset when the action cam 40 does not rotate synchronously with the rope pulley 10.

[0028] In specific implementation, a first hole 101 is provided on the side wall of the housing 100 for the lifting and pulling rod 20 to extend out; a second hole 102 is provided on the top and bottom walls of the housing 100 for the wire rope 30 to pass through; the lifting and pulling rod 20 is rotatably installed in the housing 100 through the first shaft 103, and one end of the lifting and pulling rod 20 extending out of the first hole 101 is connected to the lifting arm of the safety clamp, so that the lifting and pulling rod 20 can drive the safety clamp to operate when rotating. This integrated design encapsulates all components in the housing 100, making the speed limiter an independent module, which is convenient for integration with the elevator car, greatly simplifies the installation process, and reduces the modification of the car structure, thereby saving time and cost. At the same time, the housing 100 can play the role of supporting the internal parts to withstand the force generated when the speed limiter is in operation. In addition, the housing 100 also provides effective protection for the various components of the speed limiter, that is, it can prevent the influence of dust, moisture and other environments or other unexpected factors, ensuring that the speed limiter can work stably in harsh environments, thereby improving the reliability and service life of the speed limiter.

[0029] In one embodiment, one end of the lifting swing rod 20 passes through the lifting arm of the safety clamp through a pin shaft and is connected thereto; while in another embodiment, one end of the lifting swing rod 20 is connected to the lifting arm of the safety clamp through a lifting rod. Regardless of the connection method, the lifting swing rod 20 can effectively drive the safety clamp to ensure that the elevator stops quickly when overspeeding.

[0030] During the normal operation of the elevator, the housing 100 and the car frame follow-up speed limiter therein rise or fall with the elevator car, and the rope wheel 10 is driven to rotate by the wire rope 30. When the elevator overspeeds downward, the wire rope 30 drives the rope wheel 10 to rotate at a faster speed until the rotation speed of the rope wheel 10 exceeds the predetermined value. At this time, the centrifugal mechanism 50 starts to work, for example, the centrifugal block gradually opens a certain angle under the action of centrifugal force and then hooks the ratchet on the action cam 40, so that the rope wheel 10 drives the action cam 40 to rotate synchronously. As the rope wheel 10 and the action cam 40 rotate synchronously, the action cam 40 will hit the lifting and pulling swing rod 20, drive the lifting and pulling swing rod 20 to rotate, and then trigger the action of the safety clamp. In this way, the overspeed protection mechanism is completed through the interaction between the lifting and pulling swing rod 20 and the action cam 40, ensuring that the elevator can stop quickly, and the locking mechanism 60 located near the lifting and pulling swing rod 20 can lock it after the lifting and pulling swing rod 20 rotates the action safety clamp, thereby maintaining the triggering state of the safety clamp, ensuring that the elevator can effectively stop the car. When necessary, for example, when the elevator stops and resumes normal operation, the locking mechanism 60 can also release the lifting swing rod 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 action cam 40, and can be specifically installed on the wheel shaft 11 and cannot rotate, and its reset push rod 72 always keeps in contact with the cam surface of the reset cam 71, and the contact state is kept stable under the action of the reset spring 73. When the elevator car is stopped, the centrifugal mechanism 50 no longer works, the rotation of the action cam 40 and the rope wheel 10 is no longer synchronized, and the reset push rod 72 contacts the cam surface of the reset cam 71. At this time, due to the gradual reduction of the radius of the reset cam 71, the tangential force applied by the reset spring 73 begins to work, pushing the reset push rod 72, so that the action cam 40 is reset 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 limiter on the elevator car frame effectively reduces the length of the wire rope 30, greatly reduces the complexity of the mechanical system, and because unnecessary transmission components are reduced, the response speed of the speed limiter is improved, which means that when the elevator overspeeds, the speed limiter can start and operate more quickly to ensure that the safety clamp can be triggered in time, thereby effectively stopping the elevator and reducing the risks that may be caused by overspeeding.

[0033] In some embodiments, Figure 1 , Figure 2 , Figure 6 As shown, at least one tensioning wheel 80 is also included, and the wire rope 30 is wound around the rope wheel 10 and the tensioning wheel 80.

[0034] In specific implementation, the tensioner 80 is installed in the housing 100 through the second shaft 104. The setting of the tensioner 80 can effectively adjust the tension of the wire rope 30, ensure that the wire rope 30 and the rope wheel 10 maintain sufficient contact pressure, thereby preventing the wire rope 30 from being loose or too tight. Specifically, the wire rope 30 passes around the rope wheel 10 and passes through the tensioner 80, forming a wrap angle on the rope wheel 10. This wrap angle design increases the contact area between the wire rope 30 and the rope wheel 10, thereby significantly increasing the friction between the two, that is, the enhanced friction helps to ensure that the wire rope 30 transmits the driving force more stably, reducing the possibility of sliding or slipping. The enhanced friction also makes the transmission of the action more sensitive, thereby speeding up the starting speed of the speed limiter. When the elevator overspeeds, the speed limiter can respond more quickly, trigger the safety clamp in time, and ensure the safe stop of the elevator.

[0035] In addition, the setting of the tensioner 80 ensures that sufficient contact pressure is maintained between the wire rope 30 and the rope sheave 10, so that the entire speed limiter is firmly suspended on the wire rope 30, that is, the portion of the wire rope 30 that passes around the rope sheave 10 and the tensioner 80 and is connected to the top of the shaft is always in a taut state, which means that even if the tensioning device at the bottom of the wire rope 30 fails, the speed limiter can continue to work normally, ensuring that the speed limiter can still function even in the event of, for example, a tensioning device or some system failure, thereby ensuring the safety of the elevator when it is overspeeding.

[0036] In some embodiments, 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 arranged at one end of the lifting and pulling rocker 20. One side of the first locking member 62 is provided with a locking reset spring 64 for pulling the first locking member 62 to swing to the first position. When the second locking member 63 rotates to the first position, it is engaged and connected with the first locking member 62. The electric drive device 61 is used to drive the first locking member 62 to move to release the engaged connection with the second locking member 63.

[0037] In specific implementation, the first locking member 62 is installed in the housing 100 through the third shaft 105, and the other end of the locking reset spring 64 is fixed on the inner wall of the housing 100. The first locking member 62 and the second locking member 63 are connected by snapping, which can reliably lock the position of the lifting and pulling swing rod 20 after the safety clamp is rotated, ensuring that the lifting and pulling swing rod 20 is kept 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 and pulling swing rod when performing overspeed protection; and the electric drive device 61 is used to drive the first locking member 62 when necessary, release the snap connection between it and the second locking member 63, and allow the lifting and pulling swing rod 20 to return to the initial state or perform other operations. In addition, when the first locking member 62 is driven by the electric drive device 61 to release the snap connection with the second locking member 63, the locking reset spring 64 will help the first locking member 62 to swing around the third shaft 105, automatically return to the appropriate position of the locked state, and be ready to snap with the second locking member 63 again. Ensure that the speed limiter can recover reliably after each overspeed protection operation and be ready for the next use, avoiding operational errors or safety hazards caused by jamming or failure.

[0038] In one embodiment, the electric drive device 61 adopts an electromagnet push-pull device. Specifically, the electric drive device 61 is installed in the housing 100 through the first mounting bracket 611, and communicates with the control system of the elevator. When the lock needs to be released, the control system of the elevator will generate a magnetic force to drive the first locking member 62 and the second locking member 63 to be released by controlling the current of the electromagnet. This operation ensures that the lifting swing rod 20 can quickly return to the initial position and is ready to perform a new overspeed protection when needed.

[0039] In some embodiments, Figure 2 As shown, the lifting and pulling swing rod 20 is provided with a swing rod reset spring 21 for pulling the lifting and pulling swing rod 20 to swing to the second position. When the action cam 40 rotates to the second position, it contacts the lifting and pulling swing rod 20 to drive the lifting and pulling swing rod 20 to rotate from the second position to the first position. In specific implementation, one end of the swing rod reset spring 21 is fixed on the inner wall of the housing 100, and the other end is connected to the lifting and pulling swing rod 20. Through the restoring force applied by the swing rod reset spring 21, when the first locking member 62 is released from the engagement connection with the second locking member 63, the spring automatically pulls the lifting and pulling swing rod 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 a predetermined state after each operation.

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

[0041] In some embodiments, Figure 2 , Figure 4 As shown, a guide bracket 41 is installed on the side of the action cam 40, and a reset push rod 72 can be slidably arranged on the guide bracket 41 along the radial direction of the reset cam 71, and a stopper 721 is provided at one end of the reset push rod 72, 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 combines the action of the cam reset spring 73 to ensure that the reset push rod 72 moves stably along the trajectory of the reset cam 71 during the reset process, avoiding operation delay or failure caused by stagnation or excessive resistance.

[0042] In some embodiments, Figure 1 , Figure 2As shown, the elevator 100 further includes an electrical switch 42 located in the motion path of the action cam 40. The electrical switch 42 is triggered when the action cam 40 rotates and moves before the lifting swing rod 20. In specific implementation, the electrical switch 42 is fixedly installed in the housing 100 through the second mounting bracket 421 and can communicate with the control system of the elevator. The electrical switch 42 provides real-time feedback on the state of the action cam 40, so that the elevator control system can obtain the working information of the speed limiter in time, for example, whether the overspeed protection has been triggered. Based on this real-time information, the elevator control system can respond immediately, for example, instructing the traction machine to stop rotating to prevent the elevator from continuing to run.

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

[0044] In this embodiment, if Figure 5 As shown, the centrifugal weight 51 is provided with a centrifugal reset spring 52 connected to the rope wheel 10, which is used to reset the centrifugal weight 51 when the rotation speed of the rope wheel 10 is less than a predetermined value. In this embodiment, the centrifugal reset spring 52 is a simple mechanical element. When the elevator running speed returns to a normal level, the rotation speed of the rope wheel 10 decreases, and the centrifugal force of the centrifugal weight 51 is weakened accordingly. The centrifugal reset spring 52 automatically pulls the centrifugal weight 51 back to the initial position by providing a restoring force. In this way, the reset centrifugal weight 51 is ready for the next overspeed protection trigger. In addition, as Figure 5 As shown, a plurality of mounting holes are provided on the rope wheel 10, 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 the length, and then adjust the elastic force to adjust the triggering speed of the speed limiter.

[0045] In a second aspect, an embodiment of the present application provides an elevator, comprising the car frame follow-up speed limiter of any embodiment of the first aspect.

[0046] The car frame follow-up speed limiter and elevator provided in this embodiment effectively shorten the length of the speed limiting wire rope and improve the response speed of the speed limiter by integrating the speed limiter on the car and adopting an improved resetting method, thereby improving the safety of elevator operation; at the same time, the manufacturing cost and installation and maintenance cost of the speed limiter are reduced, and the reliability and spatial integration are improved. The improved resetting method utilizes the cooperation of a variable-diameter resetting cam with a gradually decreasing radius and a resetting push rod and a resetting spring, which can more effectively control the resetting process of the action cam, avoid the problems of sticking or inadequate resetting that may occur in the traditional resetting mechanism, thereby further improving the reliability and stability of the speed limiter.

[0047] In the description of the present invention, it should be noted that the terms "vertical", "up", "down", "horizontal", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0048] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0049] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A car frame follow-up speed limiter, comprising a rope pulley and a lifting swing rod, wherein the rope pulley is driven by a steel wire rope arranged in a vertical direction, characterized in that: An action cam is rotatably mounted on the axle of the rope pulley, and a centrifugal mechanism is provided on the rope pulley for causing the rope pulley and the action cam to rotate together when the rotation speed of the rope pulley is greater than a predetermined value; the lifting and pulling rocker arm is driven by the action cam to rotate to actuate the safety clamp, and a locking mechanism for locking and releasing the position after rotation is provided near the lifting and pulling rocker arm; the cam reset mechanism also includes: a reset cam coaxially arranged with the action cam and with a gradually decreasing radius, a reset push rod installed on the side of the action cam and abutting against the cam surface of the reset cam, and a cam reset spring matched with the reset push rod; the cam reset spring is used to generate a tangential force driving the action cam to rotate and reset when the action 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 tension wheel, and the steel wire rope is wound around the rope wheel and the tension wheel.

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 arranged at one end of the lifting and pulling rocker arm. A locking reset spring is provided on one side of the first locking member for pulling the first locking member to swing to the first position. When the second locking member is rotated to the first position, it is engaged and connected with the first locking member. The electric drive device is used to drive the first locking member to move to release the engaged connection with the second locking member.

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

5. The car frame follow-up speed governor 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 governor and elevator according to claim 1, characterized in that: A guide bracket is installed on the side of the action cam, and the reset push rod can be slidably arranged on the guide bracket along the radial direction of the reset cam. A stop portion is provided at one end of the reset push rod, 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 governor and elevator according to claim 1, characterized in that: It also includes an electrical switch located in the motion path of the action cam, wherein the electrical switch is triggered when the action cam rotates and moves before the lifting and swinging rod.

8. The car frame follow-up speed limiter according to claim 1, characterized in that: The centrifugal mechanism comprises at least one pair of centrifugal throwing blocks, which extend radially outwards under the action of centrifugal force and mesh with ratchet claws on the action cam.

9. The car frame follow-up speed governor according to claim 8, characterized in that: The centrifugal block is provided with a centrifugal reset spring connected to a rope wheel, which is used to reset the centrifugal block when the rope wheel rotation speed is less than a predetermined value; a plurality of mounting holes are opened on the rope wheel, and one end of the centrifugal reset spring can be selectively fixed to any one of the mounting holes by a fastener.

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

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