Elevator overspeed protection device

Abstract

The invention discloses an elevator overspeed protection device, comprising an electromagnetic safety clamp and a speed detection mechanism; the electromagnetic safety clamp is installed on the car and comprises an electromagnet and a clamp driven by the electromagnet, the clamp is clamped on the guide rail and has an open state and a closed state, and the clamp can be transformed between the open state and the closed state when the electromagnet is powered on or off; the speed detection mechanism is installed on the car and is used to detect the speed of the car, and is also electrically connected to the electromagnet to control the power on or off of the electromagnet; when the speed detection mechanism detects that the car is overspeeding, an overspeed signal is sent to the elevator control system to stop the output, and the electromagnet is powered off to transform the clamp into a closed state and then clamp the guide rail to stop the car, thereby realizing speed limit overspeed protection, triggering protection with fast response speed, and simple structure, which can save material cost, simplify installation process, and shorten installation time.

Description

Technical Field

[0001] The invention relates to the technical field of elevators, and in particular to an elevator overspeed protection device which simplifies installation technology and saves material costs. Background Art

[0002] At present, the overspeed protection of the elevator speed limiter uses a mechanical speed limiting solution. The elevator speed limiter is composed of a speed limiter, a wire rope, a clamp and a tensioning pulley. The speed limiter and the clamp are installed separately. The speed limiter is installed in the machine room, the clamp is installed in the car, and the tensioning pulley is installed in the pit. The speed limiter, the clamp and the tensioning pulley are connected together by a wire rope. When the elevator exceeds the speed limiter, the speed limiter is activated, and the braking is achieved by pulling the clamp by the wire rope, thereby forcibly stopping the elevator on the guide rail.

[0003] The existing elevator speed limiter has high cost, complicated installation process and procedure, long installation time, and slow response speed of the mechanical speed limiter, which is not conducive to the safe operation of the elevator.

[0004] Therefore, it is necessary to provide an elevator overspeed protection device which can save material costs, simplify installation process, shorten installation time and has fast reaction speed to solve the above problems. Summary of the invention

[0005] The object of the present invention is to provide an elevator overspeed protection device which can save material cost, simplify installation process, shorten installation time and has fast reaction speed.

[0006] To achieve the above-mentioned purpose, the technical solution of the present invention is as follows: an elevator overspeed protection device is provided, which is installed between a car and a guide rail, and includes an electromagnetic safety clamp and a speed detection mechanism; wherein the electromagnetic safety clamp is installed on the car and includes an electromagnet and a clamp driven by the electromagnet, the clamp is clamped on the guide rail and has an open state and a closed state, and the clamp can be transformed between the open state and the closed state when the electromagnet is powered on or off; the speed detection mechanism is installed on the car and is used to detect the speed of the car, the speed detection mechanism is electrically connected to the electromagnet and is used to control the power on or off of the electromagnet, and the speed detection mechanism is also connected to the elevator control system in communication; when the speed detection mechanism detects that the car is overspeeding, an overspeed signal is sent to the elevator control system to stop it from outputting, and at the same time, the electromagnet is powered off to transform the clamp into the closed state and then clamp the guide rail to stop the car.

[0007] Preferably, the electromagnetic safety clamp is also electrically connected to an elevator safety circuit, and when the clamp is converted into the closed state, the elevator safety circuit will be cut off to stop the elevator control system.

[0008] Preferably, the speed detection mechanism includes a safety box and a magnetic tape, the magnetic tape is installed on the guide rail and is parallel to the guide rail, the safety box is installed on the car and cooperates with the magnetic tape, and the safety box is also communicatively connected to the elevator control system and electrically connected to the electromagnet, the safety box is used to detect the speed of the car, and is used to send the speed of the car to the elevator control system and control the electromagnet to gain or lose power according to the speed of the car.

[0009] Preferably, the safety box includes a first switch, which is electrically connected to a power supply circuit of the electromagnet. When the safety box detects that the car is not overspeeding, the first switch is closed to energize the electromagnet, thereby causing the clamp to be in the open state without clamping the guide rail. When the safety box detects that the car is overspeeding, the first switch is opened to de-energize the electromagnet, thereby causing the clamp to be converted into the closed state and clamp the guide rail.

[0010] Preferably, the electromagnetic safety clamp also includes a second switch, which is electrically connected to the elevator safety circuit. When the clamp is in the open state, the second switch is closed, and when the clamp is converted to the closed state, the second switch is opened to cut off the elevator safety circuit.

[0011] Preferably, the second switch is a relay output inside the electromagnetic safety clamp or a self-recovering mechanical switch.

[0012] Preferably, the guide rail is provided with a convex rib, the convex rib extends along the axial direction of the guide rail, the clamp is clamped on the convex rib, the clamp can slide along the convex rib when in the open state, and the clamp clamps the convex rib when in the closed state.

[0013] Preferably, the clamp is provided with a jaw, and the jaw is engaged with the outside of the convex rib.

[0014] Preferably, the elevator overspeed protection device further comprises a mounting bracket, wherein the mounting bracket is fixed to the top and bottom ends of the guide rail, and the two ends of the magnetic tape are respectively connected to the mounting bracket.

[0015] Preferably, the electromagnetic safety clamps have an even number, and the electromagnetic safety clamps are symmetrically installed in pairs on the car to ensure that the elevator does not deform.

[0016] Compared with the prior art, the elevator overspeed protection device of the present invention adopts an electromagnetic safety clamp for stopping. The electromagnetic safety clamp includes an electromagnet and a clamp driven by the electromagnet. The clamp is clamped on the guide rail and has an open state and a closed state. When the electromagnet is powered on or off, the clamp can be transformed between the open state and the closed state. At the same time, its speed detection mechanism is installed on the car and electrically connected to the electromagnet, and is also communicated with the elevator control system. The electromagnet is controlled to be powered on or off by the speed detection mechanism, that is, when the speed detection mechanism detects that the car is overspeeding, an overspeed signal is sent to the elevator control system to stop the output, and at the same time, the electromagnet is powered off to transform the clamp into the closed state and then clamp the guide rail to stop the car, thereby realizing speed limit overspeed protection, and the trigger protection response speed is fast. At the same time, the elevator overspeed protection device has a simple structure, which can save material costs, and the installation process is simplified, which can shorten the installation time. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the installation of the elevator overspeed protection device of the present invention.

[0018] Figure 2 yes Figure 1 Top view of the .

[0019] Figure 3 It is a schematic diagram of the principle of the elevator overspeed protection device of the present invention. DETAILED DESCRIPTION

[0020] The embodiments of the present invention are now described with reference to the accompanying drawings, in which similar element numbers represent similar elements. The elevator overspeed protection device 100 provided by the present invention is installed between the elevator car 200 and the guide rail 300, wherein the guide rail 300 is installed in the hoistway 400, the elevator car 200 is installed in the hoistway 400 and connected to the guide rail 300, and the structure and installation method of the elevator car 200 and the guide rail 300 are conventional methods well known to those skilled in the art, so they are not described in detail. The structure and principle of the elevator overspeed protection device 100 of the present invention are mainly described in detail below.

[0021] Combination Figure 1-Figure 3As shown, the elevator overspeed protection device 100 of the present invention comprises a speed detection mechanism 110 and an electromagnetic safety clamp 120. Among them, the electromagnetic safety clamp 120 has at least two and is symmetrically installed in pairs on the car 200 to ensure that the elevator does not deform; in one embodiment of the present invention, two electromagnetic safety clamps 120 are provided, and the two electromagnetic safety clamps 120 are installed on the opposite side walls of the car 200 and are respectively connected to the guide rail 300. The speed detection mechanism 110 is installed on the car 200 and is used to detect the speed of the car 200. The speed detection mechanism 110 is electrically connected to the electromagnetic safety clamp 120, and the action of the electromagnetic safety clamp 120 is controlled by the speed detection mechanism 110. At the same time, the speed detection mechanism 110 is also connected to the elevator control system 500 for communication. When the speed detection mechanism 110 detects that the car 200 is overspeeding, an overspeed signal is sent to the elevator control system 500 to stop it from outputting, and at the same time, the electromagnetic safety clamp 120 is controlled to operate so as to clamp the guide rail 300, thereby stopping the car 200, and triggering a fast protection response speed.

[0022] See below Figure 2-Figure 3 As shown, in the present invention, the electromagnetic safety clamp 120 is a power-off triggering device. Specifically, each electromagnetic safety clamp 120 includes an electromagnet L1 and a clamp 121 driven by the electromagnet L1, the clamp 121 is clamped on the guide rail 300 and has an open state and a closed state, the electromagnet L1 is electrically connected to the speed detection mechanism 110, and the speed detection mechanism 110 controls the electromagnet L1 to be powered off, so that the clamp 121 can be transformed between the open state and the closed state. When the electromagnet L1 loses power and the clamp 121 is transformed into the closed state, the guide rail 300 is clamped by the clamp 121 to stop the car 200, and the trigger protection response speed is fast.

[0023] Furthermore, the electromagnetic safety clamp 120 is also electrically connected to the elevator safety circuit 510. When the clamp 121 is converted into the closed state, the elevator safety circuit 510 will be cut off to stop the elevator control system 500, thereby achieving double protection.

[0024] The elevator control system 500 and the elevator safety circuit 510 involved in the present invention are conventional methods in the field of elevator control, and therefore, they are not described in detail.

[0025] Continue to view Figure 1-Figure 3As shown, in the present invention, the speed detection mechanism 110 includes a safety box 111 and a magnetic tape 112, the magnetic tape 112 is installed on the guide rail 300 and is parallel to the guide rail 300, the safety box 111 is installed on the car 200 and cooperates with the magnetic tape 112, the safety box 111 is used to detect the speed of the car 200 and the running distance of the car 200, specifically, when the car 200 moves, the safety box 111 moves with the car 200, and the safety box 111 passes through the magnetic tape 112 when moving, so as to collect the speed and current position of the car 200. And the safety box 111 also has a first switch K1, the first switch K1 is the speed detection control output node of the safety box 111, and the first switch K1 is electrically connected to the power supply circuit of the electromagnet L1, and is used to control the power on and off of the electromagnet L1. In addition, the safety box 111 is also connected to the elevator control system 500 through a communication cable 520, and the two communicate and transmit information through protocol communication. When the car 200 is running, if the safety box 111 detects that the car 200 is not overspeeding, the first switch K1 is closed to energize the electromagnet L1, thereby making the clamp 121 in the open state without clamping the guide rail 300, and the clamp 121 can slide along the guide rail 300; when the safety box 111 detects that the car 200 is overspeeding, the first switch K1 is opened to de-energize the electromagnet L1, thereby making the clamp 121 converted to the closed state and clamp the guide rail 300, thereby stopping the car 200. At the same time, the elevator control system 500 detects that the car 200 is overspeeding through the speed detection control output node (first switch K1) of the safety box 111, so the elevator control system 500 stops outputting.

[0026] More specifically, the elevator overspeed protection device 100 further includes a mounting bracket 130, which is fixed to the top and bottom of the guide rail 300, and the two ends of the magnetic tape 112 are respectively connected to the mounting bracket 130. Of course, the magnetic tape 112 can also be fixed in other ways.

[0027] See again Figure 3 As shown, in the present invention, the electromagnetic safety clamp 120 further includes a second switch K2, which serves as an action state monitoring node of the electromagnetic safety clamp 120, and the second switch K2 is electrically connected to the elevator safety circuit 510. Therefore, when the clamp 121 is in the open state, the second switch K2 is closed, and when the clamp 121 is converted into the closed state, the second switch K2 is opened. At this time, the elevator control system 500 detects that the clamp 121 is in the closed state through the action state monitoring node (second switch K2) of the electromagnetic safety clamp 120, and because the second switch K2 is electrically connected to the elevator safety circuit 510, the elevator safety circuit 510 is directly cut off, so that the elevator control system 500 stops running, thereby achieving the purpose of double protection and improving the safety of elevator operation.

[0028] In one embodiment of the present invention, the second switch K2 is a relay outputted inside the electromagnetic safety clamp 120, but the present invention is not limited thereto. In a more preferred embodiment, the second switch K2 is a self-recovering mechanical switch, thereby improving reliability.

[0029] See below Figure 1-Figure 2 As shown, in one embodiment of the present invention, the guide rail 300 is provided with a convex rib 310, and the convex rib 310 extends along the axial direction of the guide rail 300. Correspondingly, the clamp 121 is provided with a jaw 1211, and the jaw 1211 is engaged with the outside of the convex rib 310. When the clamp 121 is in the open state, it can slide along the convex rib 310, and when the clamp 121 is converted into the closed state, it clamps the convex rib 310, thereby stopping the car 200.

[0030] Combine again below Figure 1-Figure 3 As shown, the working principle of the elevator overspeed protection device 100 of the present invention is explained.

[0031] When the elevator is running normally without overspeeding, the safety box 111 detects that the car 200 is not overspeeding, and transmits a signal indicating that the elevator is not overspeeding to the elevator control system 500. At the same time, the first switch K1 of the safety box 111 is closed, so that the electromagnet L1 is energized, so that the clamp 121 of the electromagnetic safety clamp 120 is in the open state and does not clamp the guide rail 300. At this time, the second switch K2 of the electromagnetic safety clamp 120 is closed, that is, the state detection node of the electromagnetic safety clamp 120 is closed, and the elevator control system 500 detects that the elevator car 200 is not overspeeding, and detects that the clamp 121 is in the open state through the second switch K2, so it continues to control the normal operation of the elevator.

[0032] When the elevator is running at an overspeed, the safety box 111 first detects that the car 200 is overspeeding, and transmits the signal of the elevator overspeeding to the elevator control system 500; at the same time, the first switch K1 of the safety box 111 is opened, so that the electromagnet L1 is de-energized, and the clamp 121 of the electromagnetic safety clamp 120 is converted to the closed state and clamps the guide rail 300. When the clamp 121 is converted to the closed state, the second switch K2 is triggered to open it, that is, the state detection node of the electromagnetic safety clamp 120 is opened. At this time, the elevator control system 500 detects that the elevator car 200 is overspeeding, and detects through the second switch K2 that the clamp 121 of the electromagnetic safety clamp 120 is in a closed state and clamps the guide rail 300, so the elevator control system 500 immediately stops outputting, and the elevator is stopped due to a fault.

[0033] Furthermore, since the second switch K2 is connected to the elevator safety circuit 510, when the second switch K2 is turned on, the elevator safety circuit 510 will be directly cut off, so that the elevator control system 500 stops running, thereby achieving the purpose of double protection.

[0034] In summary, since the elevator overspeed protection device 100 of the present invention adopts an electromagnetic safety clamp 120 for stopping, the electromagnetic safety clamp 120 includes an electromagnet L1 and a clamp 121 driven by the electromagnet L1, the clamp 121 is clamped on the guide rail 300 and has an open state and a closed state, and the electromagnet L1 can make the clamp 121 transform between the open state and the closed state when it is powered on and off. At the same time, its speed detection mechanism 110 is installed on the car 200 and is electrically connected to the electromagnet L1, and is also connected to the elevator control system 500 for communication, through The speed detection mechanism 110 controls the power on and off of the electromagnet L1, that is, when the speed detection mechanism 110 detects that the car 200 is overspeeding, an overspeed signal is sent to the elevator control system 500 to stop it from outputting, and at the same time, the electromagnet L1 is de-energized to convert the clamp 121 into the closed state, thereby clamping the guide rail 300 to stop the car 200, thereby realizing speed limit and overspeed protection, and the triggering protection response speed is fast. At the same time, the elevator overspeed protection device 100 has a simple structure, which can save material costs, and the installation process is simplified, which can shorten the installation time.

[0035] The above disclosure is only the preferred embodiment of the present invention, which certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the scope of the patent application of the present invention are still within the scope covered by the present invention.

Claims

1. An elevator overspeed protection device, installed between the car and the guide rail, characterized in that: include: An electromagnetic safety clamp, which is installed on the car and includes an electromagnet and a clamp driven by the electromagnet, the clamp is clamped on the guide rail and has an open state and a closed state, and the clamp can be converted between the open state and the closed state when the electromagnet is powered on or off; a speed detection mechanism, which is installed on the car and used to detect the speed of the car, the speed detection mechanism is electrically connected to the electromagnet and used to control the electromagnet to gain or lose power, and the speed detection mechanism is also communicatively connected to the elevator control system; Wherein, the speed detection mechanism includes a safety box and a magnetic tape, the magnetic tape is installed on the guide rail and is parallel to the guide rail, the safety box is installed on the car and cooperates with the magnetic tape, and the safety box is also communicatively connected with the elevator control system and electrically connected with the electromagnet, the safety box is used to detect the speed of the car, and is used to send the speed of the car to the elevator control system and control the electromagnet to gain or lose power according to the speed of the car; The electromagnetic safety clamp further comprises a second switch, the second switch being electrically connected to the elevator safety circuit, and the second switch being closed when the clamp is in the open state; When the speed detection mechanism detects that the car is overspeeding, an overspeed signal is sent to the elevator control system to stop its output, and at the same time, the electromagnet is de-energized to convert the clamp into the closed state and clamp the guide rail to stop the car. When the clamp is converted into the closed state, the second switch is opened to cut off the elevator safety circuit, so that the elevator control system stops running.

2. The elevator overspeed protection device according to claim 1, characterized in that: The safety box includes a first switch, which is electrically connected to a power supply circuit of the electromagnet. When the safety box detects that the car is not overspeeding, the first switch is closed to energize the electromagnet, thereby causing the clamp to be in the open state without clamping the guide rail. When the safety box detects that the car is overspeeding, the first switch is opened to de-energize the electromagnet, thereby causing the clamp to be converted into the closed state and clamp the guide rail.

3. The elevator overspeed protection device according to claim 1, characterized in that: The second switch is a relay output inside the electromagnetic safety clamp or a self-recovering mechanical switch.

4. The elevator overspeed protection device according to any one of claims 1 to 3, characterized in that: The guide rail is provided with a convex rib, the convex rib extends along the axial direction of the guide rail, the clamp is clamped on the convex rib, the clamp can slide along the convex rib when in the open state, and the clamp clamps the convex rib when in the closed state.

5. The elevator overspeed protection device according to claim 4, characterized in that: The clamp is provided with a jaw, which is clamped outside the convex rib.

6. The elevator overspeed protection device according to claim 1, characterized in that: It also includes a mounting bracket, which is fixed to the top and bottom ends of the guide rail, and the two ends of the magnetic tape are respectively connected to the mounting bracket.

7. The elevator overspeed protection device according to any one of claims 1 to 3, characterized in that: The electromagnetic safety clamps have an even number, and the electromagnetic safety clamps are symmetrically installed on the car in pairs.

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