Electronic safety tongs with composite pin rollers

Abstract

The invention relates to electronic safety tongs with composite pin rollers, and relates to the technical field of elevator parts. The electronic safety tongs with the composite pin roller comprise the composite pin roller and a safety tongs body. The cylindrical surface of the composite roller is in contact with the inner surface of the safety tongs body; when the electronic safety tongs are locked and move relative to the elevator car, the composite pin rollers are used for making contact with the elevator guide rails based on the elevator movement state. The composite roller comprises a metal layer and a non-metal layer, the outer surface of the non-metal layer is made of high-strength plastic, and the outer surface of the metal layer is made of metal. When the electronic safety tongs are normally powered off and locked or an elevator car sinks due to some normal use conditions, the non-metal face of the composite roller can make contact with the elevator guide rail so as to prevent the locking phenomenon between the composite roller and the elevator guide rail in the normal use process, meanwhile, normal use of the roller is guaranteed, and the service life of the elevator car is prolonged. And the safety and the use stability of the electronic safety tongs arranged on the household elevator car are ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of elevator components, in particular to an electronic safety clamp with a composite roller. Background Art

[0002] As a new elevator safety component, the electronic safety clamp has a rapidly growing application scenario and has become a necessary option in the configuration of home elevators.

[0003] However, the application of electronic safety clamps differs significantly from that of traditional safety clamps, leading to many unexpected situations during initial deployment. Direct-pull electronic safety clamps also face practical challenges. These include situations where the car can still be occupied after a power outage, or situations where a person in the car suddenly loses power and engages in unpredictable behavior. Both of these situations can cause the car to sink.

[0004] In the related art, when the car sinks, the safety clamp is likely to get stuck and cannot reset itself after power is restored, which brings certain inconveniences to actual use. Summary of the Invention

[0005] The present invention relates to an electronic safety clamp with a composite roller, which can prevent the safety clamp from being accidentally locked during normal use of the elevator through the design of the end surface material. The electronic safety clamp with a composite roller includes a composite roller and a safety clamp body; The cylindrical surface of the composite roller contacts the inner surface of the safety gear body; When the electronic safety gear is locked and generates relative motion with the elevator car, the composite roller is used to make contact with the elevator guide rail based on the elevator motion state; The composite roller includes a metal layer and a non-metal layer. The outer surface of the non-metal layer is made of high-strength plastic, and the outer surface of the metal layer is made of metal. When the stress on the non-metallic layer is less than the stress threshold, the outer diameter of the non-metallic layer is greater than the outer diameter of the metal layer; When the stress on the non-metallic layer is greater than the stress threshold, the outer diameter of the non-metallic layer is smaller than the outer diameter of the metal layer; When the elevator settles at a first speed, the non-metallic layer of the composite roller contacts the elevator guide rail; When the elevator settles at a second speed, the metal layer of the composite roller contacts the elevator guide rail, and the second speed is greater than the first speed.

[0006] In an optional embodiment, the inner surface of the safety gear body has a groove; Composite rollers cooperate with grooves; When the composite roller and the safety gear body are displaced, the composite roller moves along the groove.

[0007] In an optional embodiment, the non-metallic layer is located at the end of the composite roller; The metal layer is located in the center of the composite roller.

[0008] In an optional embodiment, the number of non-metallic layers is 2; The two non-metallic layers are respectively located at the two ends of the composite roller.

[0009] In an optional embodiment, the composite roller further comprises a plywood layer; The plywood layer is used to contact the safety gear body; The top surface of the plywood layer is realized as the contact surface between the composite roller and the safety gear body.

[0010] In an optional embodiment, the non-metallic layer is located between the plywood layer and the metal layer.

[0011] In an optional embodiment, the electronic safety clamp further includes a limiting mechanism, which is used to limit the position of the composite roller.

[0012] In an optional embodiment, the limiting mechanism is implemented as a lifting rod; One end of the lifting rod is fixedly connected to the composite roller; The lifting rod is used to drive the composite roller.

[0013] In an optional embodiment, the material of the non-metallic surface of the roller is one of polyoxymethylene, polyetheretherketone and polytetrafluoroethylene.

[0014] The technical effects of various embodiments of the present invention include at least: When the electronic safety clamp is working normally, or when the elevator car sinks due to some normal use, the non-metallic surface of the composite roller can come into contact with the elevator guide rail, causing slippage, to prevent locking between the composite roller and the elevator guide rail during normal use, while ensuring the normal use of the roller and the safety and stability of the electronic safety clamp configured in the home elevator car. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 A schematic structural diagram of an electronic safety clamp with a composite roller provided by an exemplary embodiment of the present application is shown.

[0017] Figure 2A schematic front view of an electronic safety clamp with a composite roller provided by an exemplary embodiment of the present application is shown.

[0018] Figure 3 A schematic structural diagram of a composite roller provided by an exemplary embodiment of the present application is shown.

[0019] Figure 4 A side schematic diagram of a composite roller in a stationary state provided by an exemplary embodiment of the present application is shown.

[0020] Figure 5 A schematic structural diagram of an electronic safety clamp with a lifting rod provided by an exemplary embodiment of the present application is shown. DETAILED DESCRIPTION

[0021] To make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0022] Figure 1 A schematic structural diagram of an electronic safety clamp provided by an exemplary embodiment of the present application is shown. Figure 2 Shown with Figure 1 Schematic diagram of the main view of the corresponding electronic safety clamp. Figure 3 A schematic diagram of the structure of a composite roller provided by an exemplary embodiment of the present application is shown. Figures 1 to 3 The electronic safety clamp with a composite roller includes a composite roller 1 and an electronic safety clamp body 2. The cylindrical surface of the composite roller 1 contacts the inner surface of the safety clamp body 2. When the electronic safety clamp is locked and generates relative motion with the elevator car, the composite roller 1 is used to contact the elevator guide rail based on the elevator's motion state. The composite roller 1 includes a metal layer 11 and a non-metallic layer 12. The outer surface of the non-metallic layer 12 is made of high-strength plastic, and the outer surface of the metal layer 11 is made of metal. When the stress on the non-metallic layer 12 is less than a stress threshold, the outer diameter of the non-metallic layer 12 is greater than the outer diameter of the metal layer 11. When the stress on the non-metallic layer 12 is greater than the stress threshold, the outer diameter of the non-metallic layer 12 is less than the outer diameter of the metal layer 11. When the elevator descends at a first speed, the non-metallic layer 12 of the composite roller 1 contacts the elevator guide rail 3. When the elevator descends at a second speed, the metal layer 12 of the composite roller 1 contacts the elevator guide rail 3. The second speed is greater than the first speed.

[0023] Optionally, the relative movement between the elevator car and the electronic safety clamp involved in the embodiments of the present application is the downward movement of the elevator car relative to the electronic safety clamp.

[0024] In actual application scenarios, the electronic safety clamp is installed on the periphery of the elevator guide rail. The electronic safety clamp body does not contact the elevator guide rail. When the elevator car accelerates and falls, it will be activated. The rollers in the electronic safety clamp will contact the elevator guide rail and generate friction, thereby achieving safe braking of the elevator car. The safe braking of the elevator car in this application is achieved by the metal layer on the composite roller.

[0025] In home elevator applications, there are both brief, low-acceleration sinking events caused by normal use and longer, high-acceleration sinking events caused by malfunctions. In these situations, the metal and non-metallic layers of the composite roller play their respective roles.

[0026] In the embodiment of the present application, the composite roller is arranged to be movably connected to the safety clamp body by means of a limit member or a limit mechanism, or to be able to move relative to the safety clamp body along a preset trajectory in the safety clamp body.

[0027] In the examples of this application, please refer to Figure 3 The composite roller can be implemented as a stack of multiple cylindrical components, connected by bolts through a unified opening. Therefore, the composite roller includes a metal layer and a non-metallic layer. The metal layer at least has a metal outer surface material, and the non-metallic layer at least has a non-metallic outer surface material. In other embodiments of the present application, the composite roller can be an integrally formed component, and the present application does not limit the actual internal structure of the composite roller.

[0028] Figure 4 FIG1 shows a side view of a composite roller in a stationary state provided by an exemplary embodiment of the present application. Figure 4 The outer diameters of the metal layer 11 and the non-metal layer 12 of the composite roller 2 are different in size when at rest. The outer diameter of the non-metal layer 12 is larger than that of the metal layer 11. In actual use, the non-metal layer 12 will not deform under low stress, and its outer surface is in direct contact with the elevator guide rail. When the non-metal layer 12 is subjected to high stress, it will deform, and at this time, the metal layer 11 will directly rub against the elevator guide rail. It should be noted that Figure 4 The difference in outer diameters between the non-metallic layer 12 and the metal layer 11 is magnified for illustration. In an example of practical application, the outer diameter of the non-metallic layer is greater than the outer diameter of the metal layer by 0.2-0.3 mm.

[0029] In the embodiment of the present application, the outer surface material of the metal layer can be 20CrMnMo. Correspondingly, the outer surface material of the non-metallic layer is a high-strength plastic material with elasticity.

[0030] In actual applications, during a normal power outage, the car is stationary and the safety clamp only experiences the tangential component of the spring's release force acting on the guide rail surface. The non-metallic layer within the composite roller, relying on its inherent hardness, resists deformation caused by this tangential component, which acts on the guide rail surface and the side surfaces of the non-metallic layer. When the elevator car descends at maintenance speed, the tangential component of the car forces the side surfaces of the non-metallic layer to slip within the grooves when they come into contact with the elevator guide rails, allowing the car to descend slowly. If the critical speed is exceeded, the non-metallic layer is squeezed and deformed, and the side surfaces of the metal layer press against the guide rail surface, stopping the car.

[0031] To sum up, the electronic safety clamp with composite rollers provided in the embodiments of the present application can, when the electronic safety clamp is working normally or the elevator car sinks due to some normal usage conditions, the non-metallic surface of the composite roller can come into contact with the elevator guide rails, causing slippage, so as to prevent locking between the composite rollers and the elevator guide rails during normal use, while ensuring the normal use of the rollers, and ensuring the safety and stability of the electronic safety clamp configured in the home elevator car.

[0032] Next, other specific structures of the electronic safety clamp with composite rollers involved in the embodiments of the present application are described: In an alternative embodiment, please refer to Figure 1 The inner surface of the safety gear body 2 has a groove 21; the composite roller 2 cooperates with the groove 21. When the composite roller and the safety gear body are displaced, the composite roller moves along the groove 21.

[0033] By setting the groove, the relative displacement between the composite roller and the safety clamp is restricted, so that the composite roller can reciprocate along the groove.

[0034] In an optional embodiment, the non-metallic layer is located at the end of the composite roller; the metal layer is located in the center of the composite roller. When the elevator car moves rapidly beyond the speed limit, the non-metallic layer at the end is squeezed and deformed by the strong stress, and the metal layer at the center In an alternative embodiment, Figure 3 As shown, the number of non-metallic layers is 2. The two non-metallic layers are located at the two ends of the composite roller, respectively. In other words, the composite roller is realized in an axisymmetric state.

[0035] In an alternative embodiment, please refer to Figure 3 The composite roller 1 further includes a plywood layer 13 ; the plywood layer 13 is configured to contact the safety gear body 1 ; the top surface of the plywood layer 13 serves as the contact surface between the composite roller 1 and the safety gear body 2 . Accordingly, the non-metallic layer 12 is located between the plywood layer 13 and the metal layer 11 .

[0036] In an optional embodiment, the electronic safety clamp further includes a limiting mechanism, which is used to limit the position of the composite roller.

[0037] In an alternative embodiment, please refer to Figure 5 The limiting mechanism is implemented as a lifting rod 4; one end of the lifting rod 4 is fixedly connected to the composite roller 1; the lifting rod 4 is used to drive the composite roller 1.

[0038] In an optional embodiment, the non-metallic surface of the roller is made of one of polyoxymethylene, polyetheretherketone, and polytetrafluoroethylene. In other words, the non-metallic materials in each of the above examples all have excellent mechanical, physical, chemical, and machinability properties, requiring high hardness, impact resistance, minimal deformation, high wear resistance, suitable temperature stability, suitable chemical stability, and excellent machinability.

[0039] The above are only optional embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An electronic safety clamp with a composite roller, characterized in that: The electronic safety gear comprises a composite roller and a safety gear body; The cylindrical surface of the composite roller contacts the inner surface of the safety gear body; When the electronic safety clamp is locked and generates relative motion with the elevator car, the composite roller is used to generate contact with the elevator guide rail based on the elevator motion state; The composite roller comprises a metal layer and a non-metal layer, the outer surface of the non-metal layer is made of high-strength plastic, and the outer surface of the metal layer is made of metal; When the stress applied to the non-metallic layer is less than a stress threshold, the outer diameter of the non-metallic layer is greater than the outer diameter of the metal layer; When the stress on the non-metallic layer is greater than a stress threshold, the outer diameter of the non-metallic layer is smaller than the outer diameter of the metal layer; When the elevator is descending at a first speed, the non-metallic layer of the composite roller contacts the elevator guide rail; The metal layer of the composite roller contacts the elevator guide rail when the elevator is descending at a second speed, the second speed being greater than the first speed.

2. The electronic safety clamp with composite roller according to claim 1, characterized in that: The inner surface of the safety gear body has a groove; The composite roller cooperates with the groove; When the composite roller and the safety gear body are displaced, the composite roller moves along the groove.

3. The electronic safety clamp with composite roller according to claim 1, characterized in that: The non-metallic layer is located at the end of the composite roller; The metal layer is located at the center of the composite roller.

4. The electronic safety clamp with composite roller according to claim 3, characterized in that: The number of the non-metallic layers is 2; The two non-metallic layers are respectively located at two ends of the composite roller.

5. The electronic safety clamp with composite roller according to claim 4, characterized in that: The composite roller further comprises a plywood layer; The plywood layer is used to contact the safety gear body; The top surface of the plywood layer is realized as the contact surface between the composite roller and the safety gear body.

6. The electronic safety clamp with composite roller according to claim 5, characterized in that: The non-metallic layer is located between the plywood layer and the metal layer.

7. The electronic safety clamp with composite roller according to claim 1, characterized in that: The electronic safety clamp further comprises a limiting mechanism, which is used to limit the position of the composite roller.

8. The electronic safety clamp with composite roller according to claim 7, characterized in that: The limiting mechanism is implemented as a lifting rod; One end of the lifting rod is fixedly connected to the composite roller; The lifting rod is used to drive the composite roller.

9. The electronic safety clamp with composite roller according to claim 1, characterized in that: The material of the non-metallic surface of the roller is one of polyoxymethylene, polyetheretherketone and polytetrafluoroethylene.

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