Elevator safety gear
By designing active and passive safety clamps, combined with independent actuators and linkage structures, and using acceleration sensors to sense the elevator's status, the problem of untimely response during elevator ascent under overload conditions is solved. This enables timely braking against weightlessness during descent and overload ascent, thereby improving elevator safety.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- NINGBO YIKE ELEVATOR ENGINEERING CO LTD
- Filing Date
- 2025-06-10
- Publication Date
- 2026-05-29
AI Technical Summary
Existing elevator safety brakes do not respond promptly when the elevator is overloaded and cannot effectively brake it, posing a safety hazard.
An active safety brake and a passive safety brake were designed, combining an independent actuator and a linkage structure. An acceleration sensor was used to detect the elevator's status, and synchronous braking was achieved through the independent actuator and linkage structure, including the explosives in the cylinder providing power.
It enables timely response to both weightlessness and overload ascent, improving braking efficiency and reducing damage to the safety brakes and elevator car guide rails in the elevator shaft.
Smart Images
Figure CN224298642U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of transportation equipment technology, and in particular to an elevator safety clamp. Background Technology
[0002] To improve elevator safety, safety mechanisms are usually installed in the elevator car or traction cable. Safety clamps are a common type of safety clamp that automatically locks when the elevator experiences weightlessness. However, existing safety clamps do not respond well when the elevator is overloaded. Summary of the Invention
[0003] The purpose of this application is to provide an elevator safety clamp that can respond well to both weightlessness and overload.
[0004] To achieve the above objectives, this application provides an elevator safety clamp: including an active safety clamp, the active safety clamp having two second connecting plates, a pair of second mounting brackets fixedly connected between the two second connecting plates, and two sets of limiting clamps, each set containing two clamps, arranged between the two second mounting brackets; the two second mounting brackets are movably connected to an active upper linkage and an active lower linkage, the active upper linkage including an upper drive shaft rotatably connected to the second mounting brackets, one end of the upper drive shaft being fixedly connected to an upper drive arm and the other end being fixedly connected to an upper restraining arm, an upper restraining arm being connected to the second mounting brackets by an upper spring, a second upper drive arm being fixedly connected to the middle of the upper drive shaft, the second upper drive arm being connected to two movable clamps via two active upper push-pull rods, suitable for cooperating with the two upper limiting clamps respectively; the active lower linkage including a second mounting bracket... The lower drive shaft is rotatably connected to the frame. One end of the lower drive shaft is fixedly connected to a lower drive arm, and the other end is fixedly connected to a lower restraining arm. A lower spring connects the lower restraining arm to the second frame. A second lower drive arm is fixedly connected to the middle of the lower drive shaft. The second lower drive arm is connected to two movable clamping blocks via two active push-pull rods, which are suitable for cooperating with the two limiting clamping plates below. An independent driver is connected between the upper drive arm and the lower drive arm. The independent driver includes a cylinder. A pair of telescopic rods extending from the upper and lower ends are slidably connected inside the cylinder. Explosives are disposed inside the cylinder between the two telescopic rods. A battery box, an acceleration sensor, and an igniter are disposed outside the cylinder. The battery box is electrically connected to the acceleration sensor and the igniter. The igniter passes through the side wall of the cylinder and contacts the explosives, which can ignite in time to generate driving force.
[0005] As a preferred embodiment, the system also includes a passive safety clamp, which has two first connecting plates. A pair of first configuration frames are fixedly connected between the two first connecting plates. Two sets of limiting clamps are also provided between the two first configuration frames, with two clamps in each set. The two first configuration frames are movably connected to a driven upper linkage member. The driven upper linkage member includes an upper driven shaft rotatably connected to the first configuration frame. A first upper driven arm is fixedly connected to one end of the upper driven shaft. A second upper driven arm is fixedly connected to the middle of the upper driven shaft. The second upper driven arm is connected to two movable clamping blocks via two upper driven push-pull rods, which are suitable for cooperating with the two limiting clamps above. A first upper active arm is also fixedly connected to the end of the upper active shaft. An upper connecting rod is movably connected between the first upper active arm and the first upper driven arm to allow the active upper linkage member and the driven upper linkage member to move synchronously.
[0006] As a preferred embodiment, the two first configuration frames are also movably connected to a driven lower linkage component. The driven lower linkage component includes a lower driven shaft rotatably connected to the first configuration frame. One end of the lower driven shaft is fixedly connected to a first lower driven arm, and the middle of the lower driven shaft is fixedly connected to a second lower driven arm. The second lower driven arm is connected to two movable clamping blocks via two lower driven push-pull rods, which are suitable for cooperating with the two limiting clamping plates below. The end of the lower drive shaft is also fixedly connected to a first lower drive arm, and a lower connecting rod is movably connected between the first lower drive arm and the first lower driven arm, so that the drive lower linkage component and the driven lower linkage component move synchronously.
[0007] As a preferred embodiment, the upper distance between the paired upper limiting clamps is smaller than the lower distance, and the upper width of the movable clamping block that cooperates with the upper limiting clamp is smaller than the lower width; the upper distance between the paired lower limiting clamps is larger than the lower distance, and the upper width of the movable clamping block that cooperates with the lower limiting clamp is larger than the lower width, so that the spacing changes when the movable clamps move up and down, thereby realizing the clamping and releasing actions.
[0008] As a preferred embodiment, the two limiting clamps in the same group have sliding grooves on opposite sides, and the two movable clamps in the same group have sliding plates fixedly connected to opposite sides, which are suitable for cooperating with the sliding grooves to form a sliding pair and restrict the degree of freedom of movement of the movable clamps.
[0009] As a preferred embodiment, two of the movable clamping blocks in the same group are fixedly connected to brake pads on opposite sides, and a rotatable roller is provided in the slide groove to convert sliding friction into rolling friction, thereby reducing the movement resistance of the movable clamping plate relative to the limiting clamping plate.
[0010] As a preferred embodiment, the upper end of the telescopic rod located above is rotatably connected to the upper drive arm, and the lower end of the telescopic rod located below is rotatably connected to the lower drive arm, ensuring the degree of freedom of movement of the upper and lower connecting ends of the independent driver.
[0011] As a preferred embodiment, the cylinder is fixedly connected to the second configuration frame via an extension plate, and the explosive is made of high-purity ammonium nitrate, which can remain stable for a long time and releases explosive power more gently, resulting in higher safety in use.
[0012] Compared with the prior art, the beneficial effects of this application are as follows:
[0013] (1) By designing an independent drive, no external power supply is required. The acceleration sensor is used to sense the rising and falling state of the elevator car. It can respond well to weightlessness and overload rising to achieve safe and timely braking.
[0014] (2) By setting active safety gear and passive safety gear and using linkage structure to achieve synchronous control, the elevator car can brake together when an emergency occurs, which improves braking efficiency, disperses braking pressure, and reduces damage to the safety gear and elevator car guide rails in the braking process. Attached Figure Description
[0015] Figure 1 This is a first three-dimensional schematic diagram of the overall structure of the elevator safety clamp.
[0016] Figure 2 This is a second three-dimensional schematic diagram of the overall structure of the elevator safety clamp.
[0017] Figure 3 This is a three-dimensional structural diagram showing the connection between the linkage component and the movable clamping block of the elevator safety clamp.
[0018] Figure 4 This is a schematic diagram of the second three-dimensional structure connecting the linkage of the elevator safety clamp to the movable clamping block.
[0019] Figure 5 This is a three-dimensional structural diagram showing the connection between the active linkage and the driven linkage of the elevator safety clamp.
[0020] Figure 6 This is a three-dimensional cross-sectional view of the independent actuator of the elevator safety clamp.
[0021] Figure 7 A three-dimensional structural diagram showing the limit clamp of the elevator safety gear positioned between the mounting frames.
[0022] Figure 8 This is a three-dimensional structural diagram of the movable clamping block of the elevator safety clamp.
[0023] In the diagram: 1. Passive safety clamp; 101. First connecting plate; 102. First mounting frame; 110. Driven upper linkage; 111. Upper driven shaft; 112. First upper driven arm; 113. Second upper driven arm; 114. Upper driven push-pull rod; 120. Driven lower linkage; 121. Lower driven shaft; 122. First lower driven arm; 123. Second lower driven arm; 124. Lower driven push-pull rod; 2. Active safety clamp; 201. Second connecting plate; 202. Second mounting frame; 203. Upper spring; 204. Lower spring; 205. Extension plate; 210. Active upper linkage; 211. Upper drive shaft; 212. First upper drive arm; 2 13. Second upper active arm; 214. Active upper push-pull rod; 215. Upper drive arm; 216. Upper restraining arm; 220. Active lower linkage; 221. Lower drive shaft; 222. First lower active arm; 223. Second lower active arm; 224. Active lower push-pull rod; 225. Lower drive arm; 226. Lower restraining arm; 3. Upper connecting rod; 4. Lower connecting rod; 5. Independent driver; 501. Cylinder; 502. Battery box; 503. Acceleration sensor; 504. Ignition device; 505. Telescopic rod; 506. Explosive; 6. Movable clamping block; 601. Slide plate; 602. Brake pad; 7. Limiting clamp; 701. Slide groove; 702. Roller. Detailed Implementation
[0024] The present application will be further described below with reference to specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.
[0025] In the description of this application, it should be noted that the directional terms such as "center", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. They should not be construed as limiting the specific protection scope of this application.
[0026] It should be noted that the terms "first," "second," etc., in the specification and claims of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.
[0027] The terms “comprising” and “having”, and any variations thereof, in the specification and claims of this application are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or device.
[0028] like Figure 1-8 The elevator safety brake shown includes an active safety brake 2 and a passive safety brake 1 fixed to the elevator car. The passive safety brake 1 is driven by components on the active safety brake 2, and the two can achieve synchronous braking. The active safety brake 2 has two second connecting plates 201 for fixed connection to the elevator car. A pair of parallel and symmetrical second mounting frames 202 are fixedly connected between the two second connecting plates 201. Two sets of limiting clamps 7 are arranged between the two second mounting frames 202, arranged vertically and symmetrically about the horizontal plane. Each set of limiting clamps 7 has two clamps, and the two clamps 7 in the same set are symmetrical about the vertical plane. The two second mounting frames 202 are movably connected to an active upper linkage 210 and an active lower linkage 220. The active upper linkage 210 includes an upper drive shaft 21 rotatably connected to the second mounting frame 202. 1. One end of the upper drive shaft 211 is fixedly connected to the first upper drive arm 212 and the upper driving arm 215, and the other end is fixedly connected to the upper restraining arm 216. The first upper drive arm 212, the upper driving arm 215 and the upper restraining arm 216 are all located outside the second configuration frame 202. An upper spring 203 is connected between the upper restraining arm 216 and the second configuration frame 202. A second upper drive arm 213 is fixedly connected to the middle of the upper drive shaft 211. The second upper drive arm 213 is connected to two movable clamping blocks 6 through two active upper push-pull rods 214, which are used to cooperate with the two upper limit clamping plates 7 respectively. The second upper drive arm 213 and the active upper push-pull rods 214 are located between the two second configuration frames 202. The function of the upper spring 203 is to press the active upper push-pull rods 214 and the movable clamping blocks 6 connected thereto down to the lower limit through the upper drive shaft 211 and the second upper drive arm 213.
[0029] The structure of the active lower linkage 220 is generally symmetrical to that of the active upper linkage 210. Specifically, it includes a lower active shaft 221 rotatably connected to the second configuration frame 202. One end of the lower active shaft 221 is fixedly connected to a first lower active arm 222 and a lower drive arm 225, and the other end is fixedly connected to a lower restraining arm 226. Similarly, the first lower active arm 222, the lower drive arm 225, and the lower restraining arm 226 are located outside the second configuration frame 202. A lower spring connects the lower restraining arm 226 to the second configuration frame 202. 204. A second lower active arm 223 is fixedly connected to the middle of the lower active shaft 221. The second lower active arm 223 is connected to two movable clamping blocks 6 through two active lower push-pull rods 224, which are used to cooperate with the two lower limiting clamping plates 7 respectively. The second lower active arm 223 and the active lower push-pull rods 224 are located between the two second configuration frames 202. The function of the lower spring 204 is to push the active lower push-pull rods 224 and the movable clamping blocks 6 connected thereto to the upper limit position through the lower active shaft 221 and the second lower active arm 223.
[0030] An independent actuator 5 is connected between the upper drive arm 215 and the lower drive arm 225. This actuator can drive the active safety clamp 2 and the passive safety clamp 1 to operate when needed without an external power supply. The independent actuator 5 includes a cylindrical cylinder 501, which is fixedly connected to the second configuration frame 202 via an extension plate 205, ensuring the stability of the entire independent actuator 5. A pair of telescopic rods 505 extending from the upper and lower ends are slidably connected inside the cylinder 501. The upper end of the upper telescopic rod 505 is rotatably connected to the upper drive arm 215, and the lower end of the lower telescopic rod 505 is rotatably connected to the lower drive arm 225, giving the upper and lower connecting ends of the independent actuator 5 sufficient freedom of movement. An explosive 506 is placed inside the cylinder 501 between the two telescopic rods 505. The explosive 506 is high-purity ammonium nitrate, a weak, single-element explosive with low sensitivity and low explosive power. Therefore, it will not instantly rupture the cylinder 501 during an explosion, making it relatively safe and reliable to use. In fact, each telescopic rod 505... The cylinder 501 has a larger piston structure at each end, which directly contacts the explosive 506 and bears the explosive force of the explosive 506. A battery box 502, an acceleration sensor 503, and an igniter 504 are installed outside the cylinder 501. The battery box 502 stores a battery, which acts as a mobile power source to supply power. The acceleration sensor 503 is used to detect whether the elevator car is in a falling state. The battery box 502 contains a circuit board structure for communication with the acceleration sensor 503 and the igniter 504. 04 Electrical connection enables signal processing and power supply control. Igniter 504 passes through the side wall of cylinder 501 and contacts explosive 506. After receiving the weightlessness electrical signal detected by acceleration sensor 503, igniter 504 generates an electric spark to ignite explosive 506, thereby pushing out the two telescopic rods 505. The piston of telescopic rod 505 has good sealing performance, which can tightly lock the high-pressure gas in cylinder 501, thereby maintaining the extended state of telescopic rod 505 and providing a stable force to the safety clamp.
[0031] The passive safety clamp 1 has two first connecting plates 101, which are also used for fixed connection with the elevator car. A pair of parallel and symmetrical first mounting brackets 102 are fixedly connected between the two first connecting plates 101. Two sets of limiting clamps 7 are also provided between the two first mounting brackets 102. The two sets of limiting clamps 7 are arranged vertically and are symmetrical about the horizontal plane. Each set of limiting clamps 7 has two clamps. The two limiting clamps 7 in the same set are symmetrical about the vertical plane. The two first mounting brackets 102 are movably connected to a driven upper linkage 110 and a driven lower linkage 120. The driven upper linkage 110 includes a first... The upper driven shaft 111 is rotatably connected to the configuration frame 102. One end of the upper driven shaft 111 is fixedly connected to the first upper driven arm 112. The first upper driven arm 112 is located outside the first configuration frame 102. An upper connecting rod 3 is movably connected between the first upper driven arm 112 and the first upper driving arm 212 to form a linkage structure. A second upper driven arm 113 is fixedly connected to the middle of the upper driven shaft 111. The second upper driven arm 113 is located between the two first configuration frames 102. The second upper driven arm 113 is connected to two movable clamping blocks 6 through two upper driven push-pull rods 114, which are used to cooperate with the two upper limiting clamping plates 7 respectively.
[0032] The structure of the driven lower linkage 120 is generally symmetrical to that of the driven upper linkage 110. Specifically, it includes a lower driven shaft 121 that is rotatably connected to the first configuration frame 102. One end of the lower driven shaft 121 is fixedly connected to a first lower driven arm 122. The first lower driven arm 122 is located outside the first configuration frame 102. A lower connecting rod 4 is movably connected between the first lower driven arm 122 and the first lower driving arm 222, which also forms a linkage structure. A second lower driven arm 123 is fixedly connected to the middle of the lower driven shaft 121. The second lower driven arm 123 is located between the two first configuration frames 102. The second lower driven arm 123 is connected to two movable clamping blocks 6 through two lower driven push-pull rods 124, which are used to cooperate with the two lower limiting clamping plates 7 respectively.
[0033] The upper pair of limiting clamps 7 have a smaller gap at their upper ends than at their lower ends, and the upper width of the movable clamping block 6 that cooperates with the upper limiting clamp 7 is smaller than the lower width. The lower pair of limiting clamps 7 have a larger gap at their upper ends than at their lower ends, and the upper width of the movable clamping block 6 that cooperates with the lower limiting clamp 7 is larger than the lower width. Therefore, the upper and lower sets of movable clamping blocks 6 are symmetrical to each other. The two limiting clamps 7 in the same set have a sliding groove 701 on their opposite sides. The two movable clamping blocks 6 in the same set have a sliding plate 601 fixedly connected to their opposite sides, which cooperates with the sliding groove 701 to form a sliding pair. A rotatable roller 702 is also provided in the sliding groove 701 to change sliding into rolling, which can effectively reduce the friction of the sliding plate 601 sliding in the sliding groove 701. The two movable clamping blocks 6 in the same set have a brake pad 602 fixedly connected to their opposite sides, which is used to directly contact the elevator car guide rail in the elevator shaft to generate strong friction for braking.
[0034] Working principle: When the elevator car suddenly drops or is lifted, and the acceleration of the drop or rise is greater than 0.5G, the real-time monitoring acceleration sensor 503 will send an emergency electrical signal to the circuit board in the battery box 502. The circuit board will immediately cause the battery box 502 to power the igniter 504 to detonate the weak explosive 506 in the cylinder 501, pushing open the upper drive arm 215 and the lower drive arm 225. The upper drive shaft 211 and the lower drive shaft 221 will rotate synchronously. At the same time, through the upper connecting rod 3 and the lower connecting rod 4, the upper driven shaft 111 and the lower driven shaft 121 will rotate synchronously, causing all the upper movable clamping blocks 6 to move upward and move closer to each other, and all the lower movable clamping blocks 6 to move downward and move closer to each other. The brake pads 602 on opposite sides generate strong friction with the car guide rails in the elevator shaft, thereby achieving rapid and safe braking. Since the telescopic rod 505 can provide support for a long time, the elevator can use this safety clamp to maintain stability in the elevator shaft for a long time until rescue arrives. If it is necessary to release the safety clamp, the operator only needs to use a tool to forcibly pull out the igniter 504 that is sealed and fixed to the cylinder 501, so that the high-pressure gas in the cylinder 501 can be discharged. The upper drive arm 215 and the lower drive arm 225 will be free to move closer to each other, and the movable clamps 6 placed on the upper and lower sides can move closer to each other, so that the brake pads 602 are separated from the car guide rails in the elevator shaft. After that, the elevator car can continue to move up and down.
[0035] The basic principles, main features, and advantages of this application have been described above. Those skilled in the art should understand that this application is not limited to the above embodiments. The embodiments and descriptions in the specification are merely the principles of this application. Various changes and modifications can be made to this application without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection claimed by this application is defined by the appended claims and their equivalents.
Claims
1. An elevator safety clamp, characterized in that: The system includes an active safety clamp (2), which has two second connecting plates (201). A pair of second configuration frames (202) are fixedly connected between the two second connecting plates (201). Two sets of limiting clamps (7) are provided between the two second configuration frames (202), with two clamps in each set. The two second configuration frames (202) are movably connected to an active upper linkage (210) and an active lower linkage (220). The active upper linkage (210) includes an upper active shaft (211) rotatably connected to the second configuration frames (202). One end is fixedly connected to an upper drive arm (215), and the other end is fixedly connected to an upper restraining arm (216). An upper spring (203) is connected between the upper restraining arm (216) and the second configuration frame (202). A second upper drive arm (213) is fixedly connected to the middle of the upper drive shaft (211). The second upper drive arm (213) is connected to two movable clamping blocks (6) through two active upper push-pull rods (214), which are suitable for cooperating with the two upper limiting clamping plates (7) respectively. The active lower linkage component (220) includes a lower drive shaft (221) rotatably connected to the second configuration frame (202). One end of the lower drive shaft (221) is fixedly connected to a lower drive arm (225), and the other end is fixedly connected to a lower restraining arm (226). A lower spring (204) is connected between the lower restraining arm (226) and the second configuration frame (202). A second lower drive arm (223) is fixedly connected to the middle of the lower drive shaft (221). The second lower drive arm (223) is connected to two movable clamping blocks (6) through two active lower push-pull rods (224), which are suitable for cooperating with the two lower limiting clamping plates (7) respectively. An independent driver (5) is connected between the upper drive arm (215) and the lower drive arm (225). The independent actuator (5) includes a cylinder (501), in which a pair of telescopic rods (505) extending from the upper and lower ends are slidably connected. An explosive (506) is disposed between the two telescopic rods (505) inside the cylinder (501). A battery box (502), an acceleration sensor (503), and an igniter (504) are disposed outside the cylinder (501). The battery box (502) is electrically connected to the acceleration sensor (503) and the igniter (504). The igniter (504) passes through the side wall of the cylinder (501) and contacts the explosive (506).
2. The elevator safety clamp as described in claim 1, characterized in that: It also includes a passive safety clamp (1), which has two first connecting plates (101), a pair of first configuration frames (102) fixedly connected between the two first connecting plates (101), and two sets of limiting clamps (7) are also provided between the two first configuration frames (102), with two limiting clamps (7) in each set; the two first configuration frames (102) are movably connected to a driven upper linkage (110), which includes an upper driven shaft (111) rotatably connected to the first configuration frames (102). One end of the upper driven shaft (111) is fixedly connected to a first upper driven arm (112), and the middle part of the upper driven shaft (111) is fixedly connected to a second upper driven arm (113). The second upper driven arm (113) is connected to two movable clamping blocks (6) through two upper driven push-pull rods (114), which are suitable for cooperating with the two upper limiting clamping plates (7) respectively. The end of the upper drive shaft (211) is also fixedly connected to a first upper drive arm (212), and an upper connecting rod (3) is movably connected between the first upper drive arm (212) and the first upper driven arm (112).
3. The elevator safety clamp as described in claim 2, characterized in that: The two first configuration frames (102) are also movably connected to a driven lower linkage (120). The driven lower linkage (120) includes a lower driven shaft (121) rotatably connected to the first configuration frame (102). One end of the lower driven shaft (121) is fixedly connected to a first lower driven arm (122). The middle part of the lower driven shaft (121) is fixedly connected to a second lower driven arm (123). The second lower driven arm (123) is connected to two movable clamping blocks (6) through two lower driven push-pull rods (124), which are suitable for cooperating with the two lower limiting clamping plates (7) below respectively. The end of the lower drive shaft (221) is also fixedly connected to a first lower drive arm (222). A lower connecting rod (4) is movably connected between the first lower drive arm (222) and the first lower driven arm (122).
4. The elevator safety clamp as described in any one of claims 1 to 3, characterized in that: The upper distance between the upper and lower ends of the pair of limiting clamps (7) is smaller than the lower distance, and the upper width of the movable clamp (6) that cooperates with the upper limiting clamp (7) is smaller than the lower width; the upper distance between the upper and lower ends of the pair of limiting clamps (7) is larger than the lower distance, and the upper width of the movable clamp (6) that cooperates with the lower limiting clamp (7) is larger than the lower width.
5. The elevator safety clamp as described in claim 4, characterized in that: The two limiting clamps (7) in the same group have sliding grooves (701) on opposite sides, and the two movable clamps (6) in the same group have sliding plates (601) fixedly connected on opposite sides, which are suitable for cooperating with the sliding grooves (701) to form a sliding pair.
6. The elevator safety clamp as described in claim 5, characterized in that: Two movable clamping blocks (6) in the same group are fixedly connected to brake pads (602) on opposite sides, and a rotatable roller (702) is provided in the slide groove (701).
7. The elevator safety clamp as described in any one of claims 1 to 3, characterized in that: The upper end of the telescopic rod (505) located above is rotatably connected to the upper drive arm (215), and the lower end of the telescopic rod (505) located below is rotatably connected to the lower drive arm (225).
8. The elevator safety clamp as described in claim 7, characterized in that: The cylinder (501) is fixedly connected to the second configuration frame (202) via an extension plate (205), and the explosive (506) is high-purity ammonium nitrate.