Elevator two-way double-speed limiter and elevator

Abstract

The application discloses a bidirectional double-speed governor for an elevator, which comprises a rope wheel, a main shaft, a base, a speed detection mechanism and a brake mechanism, the rope wheel is supported on the main shaft, the rope wheel drives the main shaft to rotate together, the main shaft is rotatably fixed on the base through a bearing, the speed detection mechanism can trigger the brake mechanism at a preset speed, so that the brake mechanism brakes the governor rope, different triggering speeds in the scene where the up-rated speed of a high-speed elevator is greater than the down-rated speed are realized by using only one set of speed detection mechanism, the volume and cost of the governor are greatly reduced, and different overspeed switch second triggering speeds Vu1 can be set without replacing components by further changing the setting of an elastic member, so that the governor can be applied to elevators with different up-rated speeds, and the governor is more universal.

Description

Technical Field

[0001] This invention relates to the field of elevators, and more particularly to a bidirectional dual-speed speed limiter for elevators and an elevator. Background Technology

[0002] In a typical elevator, the rated upward speed and the rated downward speed are the same. The speed governor is used to detect the elevator's overspeed behavior and trigger the brake and elevator safety clamp to operate. At this time, the overspeed trigger speed is the same for both upward and downward travel, requiring only one independent speed detection mechanism.

[0003] However, as elevators increase in speed and travel greater distances, the air pressure inside the elevator car changes drastically during ascent and descent, causing discomfort to passengers. Research has found that the human ear is better able to adapt to the pressure change during a drop in air pressure (i.e., when the elevator is ascending). Therefore, to alleviate passenger discomfort, the rated speed for descending elevators cannot be too high. Typically, the upper limit for the rated speed for descending is 10 meters per second, but the rated speed for ascending can be much greater than 10 meters per second. In this case, the overspeed trigger speed of the speed limiter is different for ascending and descending.

[0004] Chinese patent document CN200980158555.6 discloses a design where, during the elevator car's upward and downward movement, a stop mechanism is used to prevent the speed governor from triggering the braking mechanism when rotating in the upward direction. A separate, independent speed detection mechanism is used to give the upward and downward movements different trigger speeds. However, this design has the following problems: 1) The two detection mechanisms generate significant noise and exhibit poor stability when operating at high speeds. 2) The use of two detection mechanisms and actuation triggering mechanisms results in a large axial dimension, which is inconvenient for elevator machine room layout.

[0005] Chinese patent document CN201080069067.0 discloses an approach that adds an encoder to the above-mentioned technical solution to determine whether the stop plate is in the correct position in order to prevent malfunctions. However, it still uses two sets of detection mechanisms and action triggering mechanisms, resulting in a large axial dimension, which is not conducive to the layout of the elevator machine room.

[0006] Therefore, how to achieve bidirectional dual-speed detection using a single speed detection mechanism and miniaturize the speed limiter is a technical problem faced by the industry. Summary of the Invention

[0007] The summary of this invention introduces a series of simplified concepts, all of which are simplifications of existing technologies in the field, and will be further explained in detail in the detailed description section. This summary is not intended to limit the key features and essential technical features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.

[0008] To solve the above-mentioned technical problems, the present invention provides a bidirectional dual-speed speed limiter for elevators, including a rope wheel, a main shaft, a base, a speed detection mechanism, and a braking mechanism. The rope wheel is supported on the main shaft and drives the main shaft to rotate together. The main shaft is rotatably fixed on the base through bearings. The speed detection mechanism can trigger the braking mechanism at a preset speed, so that the braking mechanism brakes the speed limiter rope.

[0009] The speed limiter also includes a fixing part, a blocking mechanism, a ratchet, a first pawl, a second pawl, and an overspeed switch; the speed limiter has a preset first trigger speed Vd1 for the overspeed switch, a preset braking trigger speed Vd2, and a preset second trigger speed Vu1 for the overspeed switch, wherein Vu1>Vu>Vd2>Vd1>Vd, Vd is the rated downward speed of the elevator, and Vu is the rated upward speed of the elevator;

[0010] The ratchet is rotatably fixed to the base, but does not rotate with the rope wheel; the fixing part is fixed to the main shaft and can rotate synchronously with the main shaft.

[0011] The speed detection mechanism consists of a first fixed link, a second fixed link, a first movable link, and a second movable link, forming a quadrilateral four-bar linkage. The four-bar linkage is symmetrically arranged around the main shaft. When the rope wheel rotates, the speed detection mechanism rotates synchronously.

[0012] The first fixed link is rotatably fixed to the fixed part through the center, and the second fixed link is rotatably fixed to the fixed part through the center. Two mass blocks are respectively fixed to one end of the first fixed link and the second fixed link. When the rope wheel rotates, it is subjected to centrifugal force, and the movement tendency of the fixed end of the mass block is to move away from the center of the rope wheel.

[0013] The tail of the first pawl is fixed to the first fixed link, and the movement trend of the tail of the first pawl is the same as that of the fixed end of the mass block; the first pawl is rotatably fixed to the fixed part through the middle part, so that the movement trend of the head of the first pawl is opposite to that of the tail of the first pawl; when the head of the first pawl extends into the ratchet, it drives the ratchet to rotate.

[0014] The tail of the second pawl is fixed to the second fixed link, and the movement trend of the tail of the second pawl is the same as that of the fixed end of the mass block. The second pawl is rotatably fixed to the fixed part through its middle part, so that the movement trend of the head of the second pawl is opposite to that of the tail of the first pawl. The fixing direction of the head of the second pawl is opposite to that of the head of the first pawl. After the head of the second pawl contacts the ratchet, it cannot drive the ratchet to rotate. A lever is also fixed to the tail of the second pawl. When the tail of the second pawl moves away from the center of the rope wheel to a position other than the overspeed switch trigger position, the lever can trigger the overspeed switch to disconnect.

[0015] The blocking mechanism includes a baffle, a first swing arm, and a second swing arm; one end of the first swing arm is rotatably fixed to the fixed part, and the other end is fixed with a first pin. When the rope wheel rotates, the first pin moves away from the center of the rope wheel under the action of centrifugal force; one end of the second swing arm is rotatably fixed to the fixed part, and the other end is fixed with a second pin. When the rope wheel rotates, the second pin moves away from the center of the rope wheel under the action of centrifugal force.

[0016] The baffle is rotatably supported on the main shaft. The baffle has a baffle body, a first cutout, a second cutout, a first blocking part, and a second blocking part. A first pin extends into the first cutout, and a second pin extends into the second cutout. The first blocking part is guided to the baffle body and connected to the baffle body through an elastic element, and the second blocking part is also guided to the baffle body and connected to the baffle body through an elastic element. Through the elastic element, the baffle has different widths at different rotational speeds.

[0017] When the elevator reaches the rated upward speed Vu, the baffle has a preset first width W1, and the position of the lever at this time cannot trigger the overspeed switch to disconnect. When the elevator speed reaches the preset second trigger speed Vu1 of the overspeed switch, the baffle has a preset second width W1, and the position of the lever at this time can trigger the overspeed switch to disconnect, where W2>W1.

[0018] Preferably, a first balance spring is installed on the first movable link, and a second balance spring is installed on the second movable link. The force applied by the first balance spring to the first movable link always prevents the mass block from moving away from the center of the rope wheel. After the rope wheel rotates, the mass block moves away from the preset position under the action of centrifugal force, and the force applied by the second balance spring to the second movable link prevents the mass block from moving away from the center of the rope wheel.

[0019] Preferably, the tail and head of the first pawl are both connected to a tension spring, and the other end of the tension spring is fixed to the fixing part; the tail and head of the second pawl are both connected to a tension spring, and the other end of the tension spring is fixed to the fixing part.

[0020] Preferably, a tension spring is connected to the middle of both the first and second swing arms, and the other end of the tension spring is fixed to the fixing part.

[0021] The present invention also provides an elevator with different rated upward speeds and rated downward speeds, and applies the aforementioned elevator bidirectional dual-speed speed limiter.

[0022] Compared with the prior art, this invention uses only one speed detection mechanism to realize different trigger speeds in scenarios where the rated upward speed of a high-speed elevator is greater than the rated downward speed, which greatly reduces the size and cost of the speed governor. At the same time, by further changing the setting of the elastic element, different overspeed switch second trigger speeds Vu1 can be set without replacing the components to cope with elevators with different rated upward speeds, making the speed governor more universal. Attached Figure Description

[0023] The accompanying drawings are intended to illustrate the general characteristics of the methods, structures, and / or materials used in specific exemplary embodiments of the invention, supplementing the description in the specification. However, the drawings are schematic diagrams not drawn to scale and may not accurately reflect the precise structural or performance characteristics of any of the given embodiments. The drawings should not be construed as limiting or restricting the range of numerical values ​​or properties covered by exemplary embodiments of the invention. The invention will now be described in further detail with reference to the accompanying drawings and specific embodiments:

[0024] Figure 1 This is a front view of the overall structure of the bidirectional dual-speed speed limiter in Embodiment 1;

[0025] Figure 2 and Figure 3 This is a partial view of Embodiment 1 after some components have been hidden;

[0026] Figure 4 This is a schematic diagram of the baffle structure in Example 1;

[0027] Figure 5 This is a schematic diagram showing the position of the blocking mechanism when the elevator is descending in Example 1;

[0028] Figure 6 This is a schematic diagram of the position of the blocking mechanism when the elevator is moving upwards in Example 1.

[0029] Explanation of reference numerals in the attached figures

[0030] 1. Sheave, 2. Main shaft, 3. Speed ​​detection mechanism, 4. Blocking mechanism, 5. Ratchet, 6. First pawl

[0031] 7 Second pawl, 8 Overspeed switch, 9 Braking mechanism, 10 Base, 11 Fixing part

[0032] 31 First fixed link, 32 Second fixed link, 33 First movable link, 34 Second movable link

[0033] 35 Mass block, 36 First balance spring, 37 Second balance spring, 41 Baffle, 42 First swing rod

[0034] 43 Second rocker arm, 421 First pin, 431 Second pin, 411 First notch, 412 Second notch

[0035] 413 First blocking part, 414 Second blocking part, 410 Baffle body, 415 Elastic element Detailed Implementation

[0036] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can fully understand other advantages and technical effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through different specific embodiments, and the details in this specification can also be applied based on different viewpoints, with various modifications or changes made without departing from the overall design concept of the invention. It should be noted that, unless otherwise specified, the following embodiments and features can be combined with each other. The following exemplary embodiments of the present invention can be implemented in many different forms and should not be construed as being limited to the specific embodiments set forth herein. It should be understood that these embodiments are provided to make the disclosure of the present invention thorough and complete, and to fully convey the technical solutions of these exemplary embodiments to those skilled in the art.

[0037] Example 1

[0038] like Figures 1 to 4 As shown, Figure 1 This is a front view of the overall structure of the bidirectional dual-speed speed limiter in this embodiment. Figure 2 , Figure 3 This is a partial view after some components are hidden in this embodiment. Figure 4 This is a schematic diagram of the baffle 41 structure in this embodiment.

[0039] This embodiment provides a bidirectional dual-speed speed limiter, which has a pulley 1 supported on a main shaft 2. The pulley 1 drives the main shaft 2 to rotate together, and the main shaft 2 is rotatably fixed to a base 10 via bearings. The speed limiter is installed in an elevator system, and a speed limiter rope (not shown in the figure) is also wound on the pulley 1. An overspeed switch 8 is located on the side near the pulley 1 and fixed to the base 10.

[0040] The speed governor rope is installed on the car. Changes in the upward speed of the car cause changes in the rotational speed of the speed governor in one direction, and changes in the downward speed of the car cause changes in the rotational speed of the speed governor in the other direction.

[0041] The speed limiter also includes a speed detection mechanism 3, a fixing part 11, a blocking mechanism 4, a ratchet 5, a first pawl 6, a second pawl 7, an overspeed switch 8, and a braking mechanism 9.

[0042] The ratchet 5 is rotatably fixed to the base 10, but does not rotate with the pulley 1. The rotation of the ratchet 5 is subject to a relatively large resistance. The fixing part 11 is fixed to the main shaft 2 and can rotate synchronously with the main shaft 2.

[0043] The speed detection mechanism 3 is a quadrilateral four-bar linkage consisting of a first fixed link 31, a second fixed link 32, a first movable link 33, and a second movable link 34. The four-bar linkage is symmetrically arranged around the main shaft 2. When the rope wheel 1 rotates, the speed detection mechanism 3 rotates synchronously.

[0044] The first fixed link 31 is rotatably fixed to the fixed part 11 through the center, and the second fixed link 32 is rotatably fixed to the fixed part 11 through the center. The two mass blocks 35 are respectively fixed to one end of the first fixed link 31 and the second fixed link 32. When the rope wheel 1 rotates, it is subjected to centrifugal force, and the movement tendency of the fixed end of the mass block 35 is to move away from the center of the rope wheel 1.

[0045] The tail of the first pawl 6 is fixed to the first fixed link 31, and the movement trend of the tail of the first pawl 6 is the same as that of the fixed end of the mass block 35. The first pawl 6 is rotatably fixed to the fixed part 11 through the middle part, so that the movement trend of the head of the first pawl 6 is opposite to that of the tail of the first pawl 6. When the head of the first pawl 6 extends into the ratchet 5, it drives the ratchet 5 to rotate.

[0046] The tail of the second pawl 7 is fixed to the second fixed link 32, and the movement trend of the tail of the second pawl 7 is the same as that of the fixed end of the mass block 35. The second pawl 7 is rotatably fixed to the fixed part 11 through the middle, so that the movement trend of the head of the second pawl 7 is opposite to that of the tail of the first pawl 6. The fixing direction of the head of the second pawl 7 is opposite to that of the head of the first pawl 6. After the head of the second pawl 7 contacts the ratchet 5, it cannot drive the ratchet 5 to rotate. The tail of the second pawl 7 is also fixed with a lever (not shown in the figure). When the tail of the second pawl 7 moves away from the center of the rope wheel 1 to a position other than the trigger position of the overspeed switch 8, the lever can trigger the overspeed switch 8 to disconnect.

[0047] The first movable link 33 and the second movable link 34 are respectively hinged to the first fixed link 31 and the second fixed link 32.

[0048] A first balance spring 36 is installed on the first movable link 33, and a second balance spring 37 is installed on the second movable link 34. The force exerted by the first balance spring 36 on the first movable link 33 always prevents the mass block 35 from moving away from the center of the rope wheel 1. After the rope wheel 1 rotates, the mass block 35 moves away from the preset position under the action of centrifugal force, and then the force exerted by the second balance spring 37 on the second movable link 34 prevents the mass block 35 from moving away from the center of the rope wheel 1. That is to say, when the rope wheel 1 is stationary, the first balance spring 36 has already applied a force to the first movable link 33, but the second balance spring 37 has not yet applied a force to the second movable link 34. Only when the mass block 35 moves away from the preset position under the action of centrifugal force and continues to move away does the second balance spring 37 apply a force to the second movable link 34.

[0049] In a preferred embodiment, the tail and head of the first pawl 6 are both connected to tension springs, and the other end of the tension springs is fixed to the fixing part 11. The tail and head of the second pawl 7 are both connected to tension springs, and the other end of the tension springs is fixed to the fixing part 11.

[0050] The blocking mechanism 4 includes a baffle 41, a first swing arm 42, and a second swing arm 43.

[0051] One end of the first swing arm 42 is rotatably fixed to the fixing part 11, and the other end is fixed with a first pin 421. When the rope wheel 1 rotates, the first pin 421 moves away from the center of the rope wheel 1 under the action of centrifugal force. One end of the second swing arm 43 is rotatably fixed to the fixing part 11, and the other end is fixed with a second pin 431. When the rope wheel 1 rotates, the second pin 431 moves away from the center of the rope wheel 1 under the action of centrifugal force. The first swing arm 42 and the second swing arm 43 are arranged symmetrically about the main shaft 2. In a preferred embodiment, a tension spring is connected to the middle of both the first swing arm 42 and the second swing arm 43, and the other end of the tension spring is fixed to the fixing part 11.

[0052] Baffle 41 is rotatably supported on main shaft 2. Baffle 41 has baffle body 410, first cut portion 411, second cut portion 412, first blocking portion 413, and second blocking portion 414. First pin 421 extends into first cut portion 411, and second pin 431 extends into second cut portion 412. First blocking portion 413 is guided to baffle body 410 and connected via elastic member 415, and second blocking portion 414 is also guided to baffle body 410 and connected via elastic member 415. Through elastic member 415, baffle 41 has different widths at different rotational speeds. Based on centrifugal force calculations, baffle 41 has a preset first width W1 and a second width W2, where W2 > W1.

[0053] The braking mechanism 9 includes a trigger rod, a spring, a fixed shoe, and a movable shoe. Its structure is similar to that of the disclosed documents in the background art, and will not be described in detail here. A trigger pin is fixed to the side of the ratchet 5. When the ratchet 5 rotates, the trigger pin contacts the trigger rod, causing the braking mechanism 9 to activate and brake the speed limiter rope.

[0054] Next, combine Figure 5 and Figure 6 This section explains the operation of a bidirectional dual-speed speed governor under different elevator travel speeds (up and down). In elevator systems using a bidirectional dual-speed speed governor, the rated upward speed Vu is typically greater than the rated downward speed Vd. When the elevator is descending, there is a preset overspeed switch first trigger speed Vd1 and a preset braking trigger speed Vd2; when the elevator is ascending, there is a preset overspeed switch second trigger speed Vu1. Generally, Vu1 > Vu > Vd2 > Vd1 > Vd.

[0055] As the elevator descends, the speed governor's pulley drives the main shaft to rotate clockwise, which in turn drives the speed detection mechanism to rotate clockwise simultaneously. The blocking mechanism, driven by the fixed part, also rotates clockwise. As the speed increases, the first and second pins move away from the pulley center under centrifugal force. When the elevator's descending speed reaches the preset speed Vc, ... Figure 5As shown, the first pin is located on the right side of the first cut, and the second pin is located on the left side of the second cut. At this point, the position of the baffle does not interfere with the speed detection mechanism. When the elevator speed continues to increase, the mass block, under the action of centrifugal force, can continue to move away from the center of the rope wheel, simultaneously driving the tail of the second pawl to continue moving away from the center of the rope wheel. Typically, the preset speed Vc is less than the rated downward speed Vd. When the elevator speed reaches the preset overspeed switch first trigger speed Vd1, the lever triggers the overspeed switch to disconnect. The disconnection of the overspeed switch will cut off the elevator's safety circuit, causing the elevator drive mechanism to stop. If the elevator speed continues to increase, when the elevator speed reaches the preset braking trigger speed Vd2, the head of the first pawl extends into the ratchet, causing the ratchet to rotate. The rotation of the ratchet triggers the braking mechanism, which brakes the governor rope. The governor rope will then trigger the emergency braking device on the elevator car to stop the elevator.

[0056] When the elevator ascends, the speed limiter's pulley drives the main shaft to rotate counterclockwise, which in turn drives the speed detection mechanism to rotate counterclockwise simultaneously. The blocking mechanism, driven by the fixed part, also rotates counterclockwise. As the speed increases, the first and second pins move away from the pulley center under centrifugal force. When the elevator's ascending speed reaches the preset speed Vc, as... Figure 6 As shown, the first pin is located on the left side of the first cut, and the second pin is located on the right side of the second cut. At this time, the position of the baffle interferes with the speed detection mechanism. The first blocking part abuts against the hinge of the first movable link and the first fixed link, and the second blocking part abuts against the hinge of the second movable link and the second fixed link. Due to the large preset force of the elastic element, when the elevator speed is less than Vu, the first and second blocking parts cannot overcome the preset force of the elastic element to continue moving away from the center of the rope wheel under the action of centrifugal force. Therefore, the position of the mass block away from the center of the rope wheel under the action of centrifugal force is limited. When the elevator speed reaches the rated upward speed Vu, the baffle has a preset first width W1. At this time, the position of the lever cannot trigger the overspeed switch to disconnect. When the elevator speed reaches the preset second trigger speed Vu1 of the overspeed switch, the first and second blocking parts overcome the preset force of the elastic element and move further away from the center of the rope wheel under the action of centrifugal force. At this time, the baffle has a preset second width W1, and the position of the lever can trigger the overspeed switch to disconnect. The overspeed switch disconnects, cutting off the elevator's safety circuit and causing the elevator's main drive mechanism to stop.

[0057] The bidirectional dual-speed speed limiter of this embodiment uses a variable-width blocking mechanism and only one speed detection mechanism to achieve different trigger speeds when the rated upward speed of a high-speed elevator is greater than the rated downward speed. Compared with the prior art, this greatly reduces the size and cost of the speed limiter. At the same time, by further changing the setting of the elastic element, different overspeed switch second trigger speeds Vu1 can be set without replacing the components to cope with elevators with different rated upward speeds, making the speed limiter more universal.

[0058] Unless otherwise defined, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It will also be understood that, unless expressly defined herein, terms such as those defined in a general dictionary shall be interpreted as having the meaning consistent with their meaning in the relevant field context, and not as having an idealized or overly formal meaning.

[0059] The present invention has been described in detail above through specific embodiments and examples, but these are not intended to limit the invention. Many modifications and improvements can be made by those skilled in the art without departing from the principles of the invention, and these should also be considered within the scope of protection of the present invention.

Claims

1. A bidirectional dual-speed speed limiter for elevators, comprising a sheave, a main shaft, a base, a speed detection mechanism, and a braking mechanism, wherein the sheave is supported on the main shaft and drives the main shaft to rotate together, the main shaft is rotatably fixed on the base via bearings, and the speed detection mechanism can trigger the braking mechanism at a preset speed to brake the speed limiter rope; Its features are, The speed limiter also includes a fixing part, a blocking mechanism, a ratchet, a first pawl, a second pawl, and an overspeed switch; the speed limiter has a preset first trigger speed Vd1 for the overspeed switch, a preset braking trigger speed Vd2, and a preset second trigger speed Vu1 for the overspeed switch, wherein Vu1>Vu>Vd2>Vd1>Vd, Vd is the rated downward speed of the elevator, and Vu is the rated upward speed of the elevator; The ratchet is rotatably fixed to the base, but does not rotate with the rope wheel; the fixing part is fixed to the main shaft and can rotate synchronously with the main shaft. The speed detection mechanism consists of a first fixed link, a second fixed link, a first movable link, and a second movable link, forming a quadrilateral four-bar linkage. The four-bar linkage is symmetrically arranged around the main shaft. When the rope wheel rotates, the speed detection mechanism rotates synchronously. The first fixed link is rotatably fixed to the fixed part through the center, and the second fixed link is rotatably fixed to the fixed part through the center. Two mass blocks are respectively fixed to one end of the first fixed link and the second fixed link. When the rope wheel rotates, it is subjected to centrifugal force, and the movement tendency of the fixed end of the mass block is to move away from the center of the rope wheel. The tail of the first pawl is fixed to the first fixed link, and the movement trend of the tail of the first pawl is the same as that of the fixed end of the mass block; the first pawl is rotatably fixed to the fixed part through the middle part, so that the movement trend of the head of the first pawl is opposite to that of the tail of the first pawl; when the head of the first pawl extends into the ratchet, it drives the ratchet to rotate. The tail of the second pawl is fixed to the second fixed link, and the movement trend of the tail of the second pawl is the same as that of the fixed end of the mass block. The second pawl is rotatably fixed to the fixed part through the middle part, so that the movement trend of the head of the second pawl is opposite to that of the tail of the first pawl. The fixing direction of the head of the second pawl is opposite to that of the head of the first pawl. After the head of the second pawl contacts the ratchet, it cannot drive the ratchet to rotate. The tail of the second pawl is also fixed with a lever. When the tail of the second pawl moves away from the center of the rope wheel to a position other than the overspeed switch trigger position, the lever can trigger the overspeed switch to disconnect. The blocking mechanism includes a baffle, a first swing arm, and a second swing arm; one end of the first swing arm is rotatably fixed to the fixed part, and the other end is fixed with a first pin. When the rope wheel rotates, the first pin moves away from the center of the rope wheel under the action of centrifugal force; one end of the second swing arm is rotatably fixed to the fixed part, and the other end is fixed with a second pin. When the rope wheel rotates, the second pin moves away from the center of the rope wheel under the action of centrifugal force. The baffle is rotatably supported on the main shaft. The baffle has a baffle body, a first cutout, a second cutout, a first blocking part, and a second blocking part. A first pin extends into the first cutout, and a second pin extends into the second cutout. The first blocking part is guided to the baffle body and connected to the baffle body through an elastic element, and the second blocking part is also guided to the baffle body and connected to the baffle body through an elastic element. Through the elastic element, the baffle has different widths at different rotational speeds. When the elevator reaches the rated upward speed Vu, the baffle has a preset first width W1, and the position of the lever at this time cannot trigger the overspeed switch to disconnect. When the elevator speed reaches the preset second trigger speed Vu1 of the overspeed switch, the baffle has a preset second width W2, and the position of the lever at this time can trigger the overspeed switch to disconnect, where W2>W1.

2. The elevator bidirectional dual-speed speed limiter according to claim 1, characterized in that: A first balance spring is installed on the first movable link, and a second balance spring is installed on the second movable link. The force applied by the first balance spring to the first movable link always prevents the mass block from moving away from the center of the rope wheel. After the rope wheel rotates, the mass block moves away from the preset position under the action of centrifugal force, and the force applied by the second balance spring to the second movable link prevents the mass block from moving away from the center of the rope wheel.

3. The elevator bidirectional dual-speed speed limiter according to claim 1, characterized in that: The tail and head of the first pawl are both connected to tension springs, and the other end of the tension spring is fixed to the fixing part; the tail and head of the second pawl are both connected to tension springs, and the other end of the tension spring is fixed to the fixing part.

4. The elevator bidirectional dual-speed speed limiter according to claim 1, characterized in that: Both the first and second swing arms are connected to a tension spring at their middle sections, and the other end of the tension spring is fixed to the fixing part.

5. An elevator having different rated upward speeds and rated downward speeds, characterized in that: The elevator bidirectional dual-speed speed limiter as described in any one of claims 1 to 4 is applied.

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