Linkage mechanism for an elevator safety gear
By utilizing the linkage mechanism of the elevator safety brake, the problem of synchronous operation of the elevator safety brake is solved through the cooperation of the linkage rod, swing arm and lifting rod, the synchronous braking of the elevator car is achieved to prevent falling, and it also has flexible adjustment and reset functions.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- QUANZHOU ZHONGQIAOFUSHI ELEVATOR CO LTD
- Filing Date
- 2025-08-20
- Publication Date
- 2026-06-26
AI Technical Summary
The existing elevator safety brakes are controlled by two sets of independent speed governors, which makes it difficult to ensure that the safety brakes on both sides operate synchronously in the event of a car malfunction. This results in the car not being level and increases the risk of a fall accident.
The system employs a track linkage mechanism, which, through the cooperation of the linkage rod, swing arm, and lifting rod, enables the synchronous operation of the elevator safety clamps on both sides. The cooperation of the guide groove and guide rod ensures that the clamp body slides horizontally and presses against the guide rail. Combined with the limit switch, the system controls the traction machine to stop, achieving double braking and stopping.
It achieves synchronous braking of the elevator car when it descends at excessive speed, preventing serious fall accidents, and can adjust the linkage position as needed, and reset for easy use next time.
Smart Images
Figure CN224411154U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of elevator technology, and in particular to a linkage mechanism for an elevator safety clamp. Background Technology
[0002] An elevator is a vertical transportation device that transports people or goods. Elevators serve a designated number of floors in a building. A vertical elevator has a car that runs between at least two vertical or inclined rigid guide rails with an angle of less than 15°, facilitating passenger access or loading and unloading of goods.
[0003] Elevator safety brakes are crucial mechanical safety devices installed on both sides below the car or counterweight. Their core function is to act like a brake, clamping the car guide rails and forcibly stopping the car (or counterweight) on the rails when the car's downward speed becomes uncontrollable (overspeed or free fall), preventing a serious fall accident.
[0004] Elevator safety brakes are installed on both sides of the car. The safety brake lifting mechanism is controlled by a speed governor via a steel cable. Currently, the two sets of elevator safety brakes are controlled independently by two separate speed governors. Because the two speed governors operate independently, it is difficult to ensure that the timing of the safety brake control is completely synchronized when the car malfunctions. This leads to a situation where, even if the car is eventually stopped by the safety brakes, the car angle is very likely to fail to remain level. Therefore, further improvements are needed. Utility Model Content
[0005] To address the aforementioned problems, this application provides a linkage mechanism for elevator safety clamps.
[0006] The linkage mechanism for an elevator safety clamp provided in this application adopts the following technical solution:
[0007] An elevator safety clamp linkage mechanism includes a car, a guide rail, clamp bodies, and a lifting rod. Two clamp bodies are provided and respectively mounted on both sides of the car via brackets. The clamp bodies slide vertically to the guide rail and horizontally to the brackets. A horizontally positioned linkage shaft is rotatably connected to the upper end of the car. Both ends of the linkage shaft are fixed with swing arms, which are located above the lifting rod. A linkage rod is provided between the swing arms and the lifting rod on the same side. The upper end of the linkage rod is hinged to the end of the swing arm away from the linkage shaft axis, and the lower end of the linkage rod is hinged to the upper end of the lifting rod. During the upward movement of the lifting rod, a guide component forces the clamp bodies to slide horizontally and press against the guide rail. One of the lifting rods or the linkage rod is connected to a wire rope via a connector.
[0008] By adopting the above technical solution, when the car descends at excessive speed, the speed limiter wheel is stopped, and the steel wire rope connected to it also stops moving instantly. The car moves downward relative to the clamps, and the lifting rod moves upward relative to the car. During the upward movement of the lifting rod, the linkage shaft is forced to rotate through the linkage rod and swing arm on the same side, thereby causing the swing arm, linkage rod, and lifting rod on the other side to move upward. This enables the clamps on both sides of the car to achieve synchronous linkage, allowing the clamps on both sides to slide horizontally and press against the guide rail to achieve braking, stopping the car on the guide rail and preventing a serious fall accident.
[0009] Preferably, the lower part of the lifting rod is provided with a guide groove, and the guide member is a guide rod that protrudes and is fixed to the outer wall of the clamp body and slides through the guide groove.
[0010] By adopting the above technical solution, and utilizing the cooperation between the guide groove and the guide rod, the clamp body can be forced to slide horizontally and press against the guide rail when the lifting rod moves upward, thereby achieving braking of the car.
[0011] Preferably, the connector includes a first connecting seat and a first connecting arm, the first connecting seat being fixed to the wire rope, and the first connecting arm being fixedly connected between the first connecting seat and the lifting rod.
[0012] By adopting the above technical solution and setting the first connecting seat and the first connecting arm, the wire rope can be connected to the lifting rod, so that the wire rope can pull the lifting rod, and then drive the lifting rods on both sides to move synchronously with the help of the linkage shaft, swing arm and linkage rod, so as to realize the linkage of the two sets of elevator safety gears.
[0013] Preferably, the connector includes a second connecting seat and a second connecting arm. The second connecting seat is fixed to the wire rope, one end of the second connecting arm is fixed to the linkage rod, and the other end of the second connecting arm is hinged to the second connecting seat.
[0014] By adopting the above technical solution, the steel wire rope is connected to the linkage rod by using the second connecting seat and the second connecting arm, which enables the linkage rod to move and drive the swing arm to rotate, thereby realizing the linkage control of the elevator safety gears on both sides.
[0015] Preferably, the linkage rod has a first mounting hole, and multiple first mounting holes are provided and spaced apart along the length of the linkage rod. One end of the second connecting arm has a second mounting hole, and the second connecting arm is provided with a pin that passes through the first mounting hole and the second mounting hole.
[0016] By adopting the above technical solution, multiple first mounting holes are distributed at intervals along the length of the linkage rod. In conjunction with the second mounting holes and pins of the second connecting arm, the connection position between the second connecting arm and the linkage rod can be adjusted, thereby allowing for flexible adjustment according to actual needs.
[0017] Preferably, the linkage shaft is fixedly connected to an actuating arm, and the upper part of the car is fixedly connected to a limit switch for the actuating arm to abut against. The limit switch is electrically connected to the traction machine. When the actuating arm abuts against the limit switch, the traction machine stops running.
[0018] By adopting the above technical solution, the rotation of the linkage shaft drives the rotation of the trigger arm, and the trigger arm abuts against the limit switch, which can stop the electrically connected traction machine from running and cut off the power source to the car, thus achieving a double braking and stopping effect.
[0019] Preferably, the bracket includes a top beam fixedly connected to the top wall of the car and a side beam fixedly connected to the side wall of the car and fixedly connected to the end of the top beam. The clamp body is horizontally slidably connected to the side beam. A support vertical plate is fixedly connected to the lower end face of the top beam. At least two support vertical plates are provided and distributed along the length direction of the top beam. The linkage shaft rotates through the support vertical plate.
[0020] By adopting the above technical solution, at least two support vertical plates distributed along the length direction are fixed on the lower end face of the top beam and the linkage shaft is rotated through them, so as to realize the stable rotation of the linkage shaft, thereby driving the swing arm and linkage rod to move, ensuring smooth linkage operation of each component.
[0021] Preferably, a torsion spring is provided between the support vertical plate and the linkage shaft. The torsion spring is sleeved on the linkage shaft, one end of the torsion spring is fixedly connected to the support vertical plate, and the other end of the torsion spring is fixedly connected to the outer wall of the linkage shaft.
[0022] By adopting the above technical solution, a torsion spring is installed between the support vertical plate and the linkage shaft, which can reset the linkage shaft when the elevator resumes normal operation, making it convenient for the next use.
[0023] In summary, this utility model has the following beneficial effects:
[0024] 1. When the car descends at excessive speed, the speed limiter wheel is stopped, and the steel cable connected to it also stops moving instantly. The car moves downward relative to the clamps, and the lifting rod moves upward relative to the car. During the upward movement of the lifting rod, the linkage shaft is forced to rotate through the linkage rod and swing arm on the same side, thereby causing the swing arm, linkage rod and lifting rod on the other side to move upward. This enables the clamps on both sides of the car to achieve synchronous linkage, so that the clamps on both sides slide horizontally and press against the guide rail to achieve braking, stopping the car on the guide rail and preventing a serious fall accident.
[0025] 2. Multiple first mounting holes are distributed at intervals along the length of the linkage rod. In conjunction with the second mounting holes of the second connecting arm and the pin, the connection position between the second connecting arm and the linkage rod can be adjusted, thereby allowing for flexible adjustment according to actual needs.
[0026] 3. A torsion spring is installed between the support plate and the linkage shaft, which can reset the linkage shaft when the elevator resumes normal operation, making it convenient for the next use. Attached Figure Description
[0027] Figure 1 This is a schematic diagram of the overall structure of the linkage mechanism of an elevator safety clamp in Embodiment 1;
[0028] Figure 2 This is a schematic diagram of the linkage shaft in Example 1;
[0029] Figure 3 This is a schematic diagram of the actuator arm and limit switch in Embodiment 1;
[0030] Figure 4 This is a schematic diagram of the clamp body and lifting rod in Example 1;
[0031] Figure 5 This is a schematic diagram of the connector structure in Embodiment 2.
[0032] In the diagram, 1. Car; 11. Bracket; 12. Side beam; 121. Mounting groove; 13. Top beam; 14. Support vertical plate; 15. Mounting horizontal plate; 16. Limit switch; 2. Guide rail; 3. Clamp body; 31. Brake groove; 32. Guide rod; 4. Lifting rod; 5. Linkage shaft; 51. Swing arm; 52. Torsion spring; 53. Actuating arm; 6. Linkage rod; 61. First mounting hole; 7. Connector; 71. First connecting seat; 72. First connecting arm; 73. Second connecting seat; 74. Second connecting arm; 75. Second mounting hole; 76. Pin. Detailed Implementation
[0033] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail.
[0034] Example 1:
[0035] This application discloses a linkage mechanism for an elevator safety clamp, referring to... Figure 1 , Figure 2 The system includes a car 1, guide rails 2, clamps 3, and lifting rods 4. A bracket 11 is fixed to the outer wall of the car 1. The bracket 11 includes a pair of side beams 12 fixedly connected to the outer walls of both sides of the car 1, and a top beam 13 fixedly connected between the tops of the two side beams 12 and located above the car 1. The side beams 12 are vertically arranged, and the top beam 13 is horizontally arranged. Two guide rails 2 are vertically arranged and located on both sides of the car 1. The guide rails 2 are fixed within the elevator shaft. The cross-section of the guide rails 2 is T-shaped, with the protrusions of the guide rails 2 facing the car 1.
[0036] The outer wall of the side beam 12 has a mounting groove 121, making the cross-section of the side beam 12 U-shaped. The clamp body 3 slides longitudinally and is connected to the mounting groove 121. In this embodiment, the clamp body 3 can be connected to the side beam 12 by a sliding block. A braking groove 31 is vertically opened through the outer wall of the middle part of the clamp body 3. The protrusion of the guide rail 2 passes through the braking groove 31, so that the clamp body 3 slides vertically and is connected to the guide rail 2.
[0037] Reference Figure 2 , Figure 3 A supporting vertical plate 14 is fixedly connected to the lower end face of the top beam 13. At least two supporting vertical plates 14 are provided and distributed along the length direction of the top beam 13. In this embodiment, two supporting vertical plates 14 are provided. A linkage shaft 5 is rotatably connected between the two supporting vertical plates 14, and the axial direction of the linkage shaft 5 is parallel to the length direction of the top beam 13. A torsion spring 52 is provided between the supporting vertical plate 14 and the linkage shaft 5. The torsion spring 52 is sleeved on the linkage shaft 5, with one end of the torsion spring 52 fixedly connected to the supporting vertical plate 14 and the other end fixedly connected to the outer wall of the linkage shaft 5. A trigger arm 53 is fixedly connected to the linkage shaft 5. A mounting plate 15 located above the linkage shaft 5 is fixedly connected to the lower end face of the top beam 13. The mounting plate 15 and the supporting vertical plate 14 are fixedly connected. A limit switch 16 for the trigger arm 53 to abut is fixedly connected to the lower end face of the mounting plate 15. The limit switch 16 is electrically connected to the traction machine. When the trigger arm 53 abuts against the limit switch 16, the traction machine stops running.
[0038] Reference Figure 2 , Figure 4 Both ends of the linkage shaft 5 are fixed with swing arms 51, which are located above the lifting rod 4. A linkage rod 6 is provided between the swing arms 51 and the lifting rod 4 located on the same side. The upper end of the linkage rod 6 is hinged to the end of the swing arm 51 away from the axis of the linkage shaft 5, and the lower end of the linkage rod 6 is hinged to the upper end of the lifting rod 4. The lifting rod 4 is slidably connected to the clamp body 3. In this embodiment, during the upward movement of the lifting rod 4, the clamp body 3 is forced to slide horizontally and press against the guide rail 2 by the guide member. Specifically, the lower part of the lifting rod 4 is provided with a guide groove. The guide member is a guide rod 32 that protrudes and is fixed to the outer wall of the clamp body 3 and slides through the guide groove. By utilizing the cooperation between the guide groove and the guide rod 32, when the lifting rod 4 moves upward, the clamp body 3 can be forced to slide horizontally so that the inner wall of the stop groove presses against the outer wall of the protrusion of the guide rail 2.
[0039] One of the lifting rods 4 or linkage rods 6 is connected to the wire rope via a connector 7. In this embodiment, the lifting rod 4 and the wire rope are connected. Specifically, the connector 7 includes a first connecting seat 71 and a first connecting arm 72. The first connecting seat 71 is fixed to the wire rope, and the first connecting arm 72 is fixedly connected between the first connecting seat 71 and the lifting rod 4. One end of the first connecting arm 72 is fixed to the upper part of the lifting rod 4, and the other end of the first connecting arm 72 is fixed to the first connecting seat 71.
[0040] The implementation principle of the linkage mechanism of an elevator safety clamp in this embodiment is as follows: When the car 1 descends at excessive speed, the speed limiter wheel of the speed limiter is stopped, and the steel wire rope connected to it also stops moving instantaneously. At this time, the car 1 moves downward relative to the clamp body 3, the lifting rod 4, and the connecting piece 7, that is, the lifting rod 4 moves upward relative to the car 1. During the upward movement of the lifting rod 4, the linkage shaft 5 is forced to rotate through the linkage rod 6 and the swing arm 51 on the same side, thereby causing the swing arm 51, the linkage rod 6, and the lifting rod 4 on the other side to move upward. The cooperation between the guide groove and the guide rod 32 forces the clamp body 3 to slide horizontally when the lifting rod 4 moves upward, so that the inner wall of the stop groove abuts against the outer wall of the protrusion of the guide rail 2. This enables the clamp bodies 3 on both sides of the car 1 to move synchronously and horizontally to abut against the guide rail 2 to achieve braking. At the same time, the trigger arm 53 abuts against the limit switch 16, which can stop the electrically connected traction machine from running and cut off the power source of the car 1, achieving a double braking and stopping effect to prevent serious fall accidents.
[0041] Example 2:
[0042] The difference from Example 1 is that, referring to Figure 5 In this embodiment, the linkage rod 6 is connected to the wire rope. Specifically, the connector 7 includes a second connecting seat 73 and a second connecting arm 74. The second connecting seat 73 is fixed to the wire rope, one end of the second connecting arm 74 is fixed to the linkage rod 6, and the other end of the second connecting arm 74 is hinged to the second connecting seat 73. The linkage rod 6 has a first mounting hole 61, and multiple first mounting holes 61 are provided and spaced apart along the length direction of the linkage rod 6. One end of the second connecting arm 74 has a second mounting hole 75, and the second connecting arm 74 is provided with a pin 76 that passes through the first mounting hole 61 and the second mounting hole 75.
[0043] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.
Claims
1. A linkage mechanism for an elevator safety clamp, characterized in that: The system includes a car (1), a guide rail (2), clamps (3), and a lifting rod (4). Two clamps (3) are provided and are respectively installed on both sides of the car (1) via brackets (11). The clamps (3) are vertically slidably connected to the guide rail (2) and horizontally slidably connected to the brackets (11). The upper end of the car (1) is rotatably connected to a horizontally arranged linkage shaft (5). Both ends of the linkage shaft (5) are fixed with swing arms (51). The swing arms (51) are located at the lifting rod. Above the rod (4), a linkage rod (6) is provided between the swing arm (51) and the lifting rod (4) on the same side. The upper end of the linkage rod (6) is hinged to the end of the swing arm (51) away from the axis of the linkage shaft (5), and the lower end of the linkage rod (6) is hinged to the upper end of the lifting rod (4). During the upward movement of the lifting rod (4), the clamp body (3) is forced to slide horizontally and press against the guide rail (2) through the guide member. One of the lifting rods (4) or the linkage rod (6) is connected to the wire rope through the connector (7).
2. The linkage mechanism of an elevator safety clamp according to claim 1, characterized in that: The lower part of the lifting rod (4) is provided with a guide groove, and the guide is a guide rod (32) that protrudes from and is fixed to the outer wall of the clamp body (3) and slides through the guide groove.
3. The linkage mechanism of an elevator safety clamp according to claim 1, characterized in that: The connector (7) includes a first connecting seat (71) and a first connecting arm (72). The first connecting seat (71) is fixed to the wire rope, and the first connecting arm (72) is fixedly connected between the first connecting seat (71) and the lifting rod (4).
4. The linkage mechanism of an elevator safety clamp according to claim 1, characterized in that: The connector (7) includes a second connecting seat (73) and a second connecting arm (74). The second connecting seat (73) is fixed to the wire rope, one end of the second connecting arm (74) is fixed to the linkage rod (6), and the other end of the second connecting arm (74) is hinged to the second connecting seat (73).
5. The linkage mechanism of an elevator safety clamp according to claim 4, characterized in that: The linkage rod (6) has a first mounting hole (61), and there are multiple first mounting holes (61) that are spaced apart along the length of the linkage rod (6). One end of the second connecting arm (74) has a second mounting hole (75), and the second connecting arm (74) has a pin (76) that passes through the first mounting hole (61) and the second mounting hole (75).
6. The linkage mechanism of an elevator safety clamp according to claim 1, characterized in that: The linkage shaft (5) is fixedly connected to the trigger arm (53), and the upper part of the car (1) is fixedly connected to the limit switch (16) for the trigger arm (53) to abut. The limit switch (16) is electrically connected to the traction machine. When the trigger arm (53) abuts against the limit switch (16), the traction machine stops running.
7. The linkage mechanism of an elevator safety clamp according to claim 1, characterized in that: The bracket (11) includes a top beam (13) fixedly connected to the top wall of the car (1) and a side beam (12) fixedly connected to the side wall of the car (1) and fixedly connected to the end of the top beam (13). The clamp body (3) is horizontally slidably connected to the side beam (12). A support vertical plate (14) is fixedly connected to the lower end face of the top beam (13). At least two support vertical plates (14) are provided and distributed along the length direction of the top beam (13). The linkage shaft (5) is rotatably inserted through the support vertical plate (14).
8. The linkage mechanism of an elevator safety clamp according to claim 7, characterized in that: A torsion spring (52) is provided between the support vertical plate (14) and the linkage shaft (5). The torsion spring (52) is sleeved on the linkage shaft (5). One end of the torsion spring (52) is fixedly connected to the support vertical plate (14), and the other end of the torsion spring (52) is fixedly connected to the outer wall of the linkage shaft (5).