An elevator safety gear operating mechanism

Abstract

The present invention discloses an elevator safety gear operating mechanism, which includes a safety gear disposed on an elevator car. An electromagnetic brake is provided on the elevator car. The connecting rod of the electromagnetic brake is connected to the pull rod of the safety gear through a coupling, and the electromagnetic brake is connected to an elevator control cabinet. When it is detected that the elevator is overspeed, the electromagnetic brake is activated. The electromagnetic brake pulls the pull rod of the safety gear through the coupling to trigger the safety gear, locking the elevator car on the guide rail. By using the electromagnetic brake to operate the safety gear, components such as a speed limiter, a tension pulley, a steel wire rope, and a connecting rod that are conventionally required to be used in conjunction with the safety gear are removed. The control of the safety gear is more direct and efficient, reducing the fault sources of safety gear failure, simplifying the safety gear control mechanism, with safe and reliable operation, facilitating manufacturing, installation and maintenance, and reducing costs.

Description

Technical Field

[0001] The present invention relates to the technical field of elevators, and particularly to an elevator safety gear operating mechanism. Background Art

[0002] As an important means of transportation in daily life, the safe operation of elevators is related to people's lives and property safety. As the most important safety component in an elevator, the safety gear can reliably lock onto the guide rail in time when the elevator is overspeed, serving the purpose of stopping the elevator and protecting passengers and equipment. The traditional safety gear structure needs to cooperate with the speed limiter device to function, and has problems such as complex structure, difficult reset, high maintenance cost, and many fault points. Specifically, it is manifested as follows:

[0003] 1. The speed limiter - safety gear linkage mechanism mainly consists of a speed limiter and its electrical switch, a safety gear and its electrical switch, a tensioning wheel and its electrical switch, a tensioning mechanism, a steel wire rope, and a set of link mechanisms. The speed limiter consists of structures such as a centrifugal swinging device, a locking device, and a reset device. The entire linkage mechanism is complex and bulky.

[0004] 2. The speed limiter - safety gear linkage mechanism needs to be regularly inspected and tested. The operating speed of the speed limiter needs to be calibrated using special tools and must meet the requirements. The completion of the linkage test involves operations in the machine room, hoistway, and pit. Incorrect reset operations pose risks of shearing, extrusion, and falling. Operators need to be certified, resulting in relatively high labor and financial costs.

[0005] 3. In the speed limiter - safety gear linkage device, inflexible operation of the speed limiter, oil contamination of the steel wire rope, insufficient tension of the tensioning wheel, failure of the mechanical link mechanism, etc. may all cause the safety gear to ultimately fail to act in time. At the same time, the settings of the speed limiter electrical switch and the tensioning wheel switch also increase the risk of failure. Summary of the Invention

[0006] The present invention provides an elevator safety gear operating mechanism, which has the advantages of simple structure, removing components such as the speed limiter, tensioning wheel, steel wire rope, and link that are traditionally used in conjunction with the safety gear. The control of the safety gear is more direct and efficient, reducing the fault sources of safety gear failure, simplifying the safety gear control mechanism, with safe and reliable operation, facilitating manufacturing, installation, and maintenance, and reducing costs.

[0007] The above object of the present invention is achieved through the following technical solution. An elevator safety gear operating mechanism includes a safety gear provided on an elevator car. An electromagnetic brake is provided on the elevator car. The link of the electromagnetic brake is connected to the lifting rod of the safety gear through a coupling, and the electromagnetic brake is connected to an elevator control cabinet.

[0008] The present invention is further configured to further include a striking plate and a limiting plate. The striking plate is rotatably mounted on the I-beam of the bottom beam of the elevator car through a rotating shaft. The limiting plate is sleeved on the coupling and fixedly connected to the coupling. The limiting plate is horizontally arranged. The striking plate contacts the edge of the limiting plate. The edges of the limiting plate and the striking plate in contact are both wedge-shaped, and the wedge-shaped edges of the limiting plate and the striking plate are complementary in shape. The wedge-shaped edge of the striking plate presses on the wedge-shaped edge of the limiting plate. Compression springs connected to the I-beam of the bottom beam of the elevator car are provided at both positions of the striking plate on both sides of the rotating shaft.

[0009] The present invention is further configured to that the thickness of the contact end of the striking plate and the limiting plate is not less than 2 / 3 of the stroke of the safety tong lifting rod when the safety tong is tightened. When the limiting plate is located above the striking plate, the safety tong is in a state of clamping the guide rail.

[0010] The present invention is further configured to that a tension spring is provided between the limiting plate and the safety tong.

[0011] The present invention is further configured to that a limiting bolt is provided on the I-beam of the bottom beam of the elevator car. The limiting bolt is parallel to the rotating shaft and contacts the end of the striking plate away from the limiting plate.

[0012] The present invention is further configured to further include a safety tong electric switch, and the safety tong electric switch is installed on the elevator car and faces the limiting plate.

[0013] In summary, the beneficial effects of the present invention are as follows:

[0014] 1. When it is detected that the elevator is overspeed, the electromagnetic brake is activated. The electromagnetic brake pulls the lifting rod of the safety tong through the coupling to trigger the safety tong, and locks the elevator car on the guide rail. By using the electromagnetic brake to control the safety tong, components such as the speed limiter, tension pulley, steel wire rope, and connecting rod that are conventionally required to be used in conjunction with the safety tong are removed. The control of the safety tong is more direct and efficient, reducing the fault sources of the safety tong failure, simplifying the safety tong control mechanism, with safe and reliable actions, facilitating manufacturing, installation, and maintenance, and reducing costs;

[0015] 2. The striking plate and the limiting plate are provided, and the edges where the striking plate and the limiting plate are in contact are wedge-shaped. When the safety tong is triggered, the limiting plate moves above the striking plate and is blocked by the striking plate and cannot be reset. If it is necessary to reset the safety tong, the striking plate must be manually operated to make the limiting plate fall to complete the reset. Therefore, the safety tong is not easily misreset after being triggered and must be manually reset after the maintenance personnel complete the maintenance, improving the reliability of the safety tong;

[0016] 3. The safety clamp electrical switch is set to detect whether the limit plate is in the initial position. When in the initial position, the safety clamp electrical switch faces the limit plate directly, and the safety clamp electrical switch can detect the presence of the limit plate. After the safety clamp is triggered, the limit plate moves upward. At this time, the safety clamp electrical switch cannot detect the limit plate, so it can be judged whether the safety clamp is in the triggered state. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0018] Figure 2 is a schematic diagram of the installation of the striking plate in the present invention;

[0019] Figure 3 is a diagram showing the positional relationship between the striking plate and the limit plate when the limit plate is in the initial position in the present invention;

[0020] Figure 4 is a diagram showing the positional relationship between the striking plate and the limit plate after the limit plate moves upward in the present invention;

[0021] Figure 5 is a diagram showing the positional relationship between the striking plate and the limit plate when the limit plate is reset in the present invention.

[0022] In the figure, 1, I-beam of the elevator car bottom beam; 2, compression spring; 3, striking plate; 4, rotating shaft; 5, electromagnetic brake; 6, limit plate; 7, safety clamp electrical switch; 8, tension spring; 9, safety clamp; 10, coupling; 11, gasket; 12, nut; 13, lower positioning screw; 14, upper positioning screw; 15, limit bolt. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] The following will describe in detail the specific embodiments of the present invention with reference to the accompanying drawings.

[0024] Example 1: Refer to Figures 1-5, an elevator safety gear operating mechanism, including a safety gear 9 provided on the elevator car, and the guide rail of the elevator is located in the middle of the safety gear 9. An electromagnetic brake 5 is provided on the elevator car. An electromagnet is provided inside the electromagnetic brake 5. The connecting rod of the electromagnetic brake 5 is connected to the pull rod of the safety gear 9 through a coupling 10. When the electromagnetic brake 5 is triggered by power-on, the electromagnet works to drive the connecting rod to move upward by magnetic force, pulling the pull rod of the safety gear 9 upward to trigger the safety gear 9. The electromagnetic brake 5 is connected to the elevator control cabinet. When the elevator is overspeed, the elevator control cabinet gives a trigger signal to the electromagnetic brake 5 to start the electromagnetic brake 5. The electromagnetic brake 5 pulls the pull rod of the safety gear 9 through the coupling 10 to trigger the safety gear 9, locking the elevator car on the guide rail to achieve emergency braking of the elevator. By using the electromagnetic brake 5 to operate the safety gear 9, components such as the speed limiter, tension pulley, steel wire rope, and connecting rod that are traditionally required to be used in conjunction with the safety gear 9 are removed. The control of the safety gear 9 is more direct and efficient, reducing the failure sources of the safety gear 9, simplifying the control mechanism of the safety gear 9, with safe and reliable actions, facilitating manufacturing, installation, and maintenance, and reducing costs;

[0025] This embodiment also includes a plate 3 and a limit plate 6, which constitute a reset mechanism. The plate 3 is rotatably mounted on the elevator car bottom beam I-shaped steel 1 through a rotating shaft 4, and the rotating shaft 4 crosses the bottom of the elevator car bottom beam I-shaped steel 1. The two ends of the rotating shaft 4 are mounted through a gasket 11 and a nut 12. One side of the plate 3 is tilted obliquely downward for manual operation. The limit plate 6 is sleeved on the coupling 10 and fixedly connected to the coupling 10. The limit plate 6 is arranged horizontally. When the safety clamp 9 is triggered, the limit plate 6 will move upward with the coupling 10. The plate 3 contacts the edge of the limit plate 6. The edges where the limit plate 6 and the plate 3 meet are both set to wedge shape. The wedge-shaped edges of the limit plate 6 and the plate 3 complement each other. The wedge-shaped edge of the plate 3 presses on the wedge-shaped edge of the limit plate 6, that is, the wedge block at the edge of the limit plate 6 is located below the wedge block at the edge of the plate 3. The plate 3 is located on both sides of the rotating shaft 4 and is provided with compression springs 2 connected to the elevator car bottom beam I-shaped steel 1. The compression springs 2 are in a compressed state, exerting a certain thrust on the plate 3, so that the rotation of the plate 3 has a large resistance. The plate 3 is provided with a lower positioning screw 13, and the elevator car bottom beam I-shaped steel 1 is provided with an upper positioning screw 14. The compression spring 2 is arranged between the lower positioning screw 13 and the upper positioning screw 14. The ends of the lower positioning screw 13 and the upper positioning screw 14 both extend into the compression spring 2 to position the compression spring 2 and limit the compression distance of the compression spring 2 to prevent the compression spring 2 from being over-compressed. In addition, in order to limit the compression distance of the compression spring 2, a sleeve can be provided on the outside of the compression spring 2, and the length of the sleeve is less than the length of the compression spring 2. A tension spring 8 is provided between the limit plate 6 and the safety clamp 9. The tension spring 8 is in a stretched state, applying a downward pulling force to the limit plate 6. In order to make the force uniform, a tension spring 8 is provided on each side of the lifting rod of the safety clamp 9. The tension spring 8 makes the limit plate 6 always in the initial position, so that when the elevator is operating normally, the safety clamp 9 is not easy to clamp the guide rail due to shaking and other reasons, thereby causing additional resistance to the operation of the elevator.

[0026] The thickness of the contact end of the hitting plate 3 and the limit plate 6 is not less than 2 / 3 of the stroke of the safety clamp lifting rod when the safety clamp 9 is clamped. When the limit plate 6 is located on the upper side of the hitting plate 3, the safety clamp 9 is in a state of clamping the guide rail. Therefore, when the hitting plate 3 is reset, the safety clamp 9 is always in a clamped state.

[0027] When the safety clamp 9 is not triggered, the limit plate 6 is in the initial position (reference Figure 3 ); When the safety clamp 9 is triggered, the limit plate 6 moves to the top of the striking plate 3, and the striking plate 3 presses against the limit plate 6 from the bottom. Due to the action of the compression spring 2, the limit plate 6 cannot be reset by itself (refer to Figure 4 ); If the safety clamp 9 is to be reset, the plate 3 must be manually operated to make the limit plate 6 fall down to complete the reset (reference Figure 5), therefore, after the safety clamp 9 is triggered, it is not easily reset by mistake and must be manually reset after the maintenance personnel complete the maintenance, which improves the reliability of the safety clamp 9.

[0028] This embodiment further includes a safety clamp electrical switch 7, and the safety clamp electrical switch 7 is installed on the elevator car and faces the limit plate 6. The provided safety clamp electrical switch 7 is used to detect whether the limit plate 6 is in the initial position. The safety clamp electrical switch 7 is a photoelectric sensor that outputs a switch signal. When in the initial position, the safety clamp electrical switch 7 faces the limit plate 6, and the safety clamp electrical switch 7 can detect the presence of the limit plate 6. After the safety clamp 9 is triggered, the limit plate 6 moves upward. At this time, the safety clamp electrical switch 7 cannot detect the limit plate 6, so it can be judged whether the safety clamp 9 is in the triggered state.

[0029] Embodiment 2: The difference from Embodiment 1 is that with reference to Figure 6 , a limit bolt 15 is provided on the I-beam of the elevator car bottom beam 1. The limit bolt 15 is parallel to the rotating shaft 4, and the limit bolt 15 contacts the end of the striker plate 3 away from the limit plate 6. The setting of the limit bolt 15 prevents the contact end of the striker plate 3 and the limit plate 6 from swinging downward. Therefore, when the safety clamp 9 is triggered and not reset, the limit plate 6 will not fall, improving safety.

[0030] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the inventive concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention.

Claims

1. An elevator safety gear operating mechanism, including a safety gear (9) provided on an elevator car, characterized in that, an electromagnetic brake (5) is provided on the elevator car, a connecting rod of the electromagnetic brake (5) is connected to a lifting rod of the safety gear (9) through a coupling (10), and the electromagnetic brake (5) is connected to an elevator control cabinet; it further includes a striker plate (3) and a limit plate (6), the striker plate (3) is rotatably mounted on an I-beam (1) of the bottom beam of the elevator car through a rotating shaft (4), the limit plate (6) is sleeved on the coupling (10) and fixedly connected to the coupling (10), the limit plate (6) is horizontally arranged, the striker plate (3) contacts the edge of the limit plate (6), and the edges where the limit plate (6) and the striker plate (3) meet are both provided as wedges; the wedge-shaped edges of the limit plate (6) and the striker plate (3) are complementary in shape, the wedge-shaped edge of the striker plate (3) presses on the wedge-shaped edge of the limit plate (6), and compression springs (2) connected to the I-beam (1) of the bottom beam of the elevator car are provided at both positions of the striker plate (3) on both sides of the rotating shaft (4); the thickness of the contact end of the striker plate and the limit plate is not less than 2 / 3 of the stroke of the safety gear lifting rod when the safety gear is clamped, and when the limit plate is on the upper side of the striker plate, the safety gear is in a state of clamping the guide rail; it further includes a safety gear electrical switch (7), and the safety gear electrical switch (7) is installed on the elevator car and faces the limit plate (6).

2. The elevator safety gear operating mechanism according to claim 1, characterized in that, a tension spring (8) is provided between the limit plate (6) and the safety gear (9).

3. The elevator safety gear operating mechanism according to claim 1, characterized in that, a limit bolt (15) is provided on the I-beam (1) of the bottom beam of the elevator car, the limit bolt (15) is parallel to the rotating shaft (4), and the limit bolt (15) contacts the end of the striker plate (3) away from the limit plate (6).

Images