Electronic speed limiter for an elevator

Abstract

The application discloses an electronic speed limiter of an elevator, which comprises a frame (1), a rope pulley (2), a first disc (3) and a control board (8). The electronic speed limiter synchronously outputs a first overspeed signal and a second overspeed signal when overspeeding. Before stopping, a second disc (4) rotates by a certain angle and drives the first disc (3) to trigger a switch on the frame (1) to output the second overspeed signal. The electronic speed limiter increases the discs for speed measurement and stopping, and the speed measurement is realized by detecting the on-off of the passing of the side wall of the disc through the proximity switch. When overspeeding, the electromagnet falls to clamp the mechanical action of the disc. After the mechanical action, the disc rotates to trigger the lower switch. The overspeed electrical switch is simultaneously outputted through the lower switch and the circuit board electronic switch, so that the reliability and the stopping effect are better.

Description

Technical Field

[0001] This invention relates to the field of elevator component technology, specifically to an electronic speed limiter for elevators. Background Technology

[0002] An electronic speed limiter is currently disclosed, comprising a base and an axle mounted on the base, an electrical trigger, a linkage mechanism, and a brake. The axle is rotatably fitted to the base, and a rope pulley is coaxially mounted on the axle. The rope pulley has a friction wheel. The axle, rope pulley, and friction wheel rotate synchronously. The electrical trigger is driven by the linkage mechanism, which is driven by the brake. When the rope pulley reaches a target speed, the electrical trigger activates, driving the linkage mechanism to move the brake until it contacts the friction wheel, thus stopping the rope pulley. The axle has a magnet, and the base has an encoder corresponding to the magnet. Shielding covers are provided at both ends of the base corresponding to the axle, located outside the magnet and its corresponding encoder. The linkage mechanism includes a first linkage arm, a first rotating shaft, a second rotating shaft, a second linkage arm, a third rotating shaft, a third linkage arm, and a fourth rotating shaft. The first end of the first linkage arm is hinged to the base via the first rotating shaft. The second ends of the first linkage arm and the first ends of the second linkage arm are hinged to each other via the second rotating shaft. The base has a movable groove for the second rotating shaft. The second ends of the second linkage arm and the first ends of the third linkage arm are hinged to each other via the third rotating shaft. The base has a guide groove for the movable third rotating shaft. The second end of the third linkage arm is hinged to a brake via the fourth rotating shaft, and the brake is hinged to the base. Magnets are installed at the left and right ends of the wheel axle. Correspondingly, encoders corresponding to the magnets are installed on the left and right uprights. The magnets and encoders work together to form a magnetic encoder, enabling the detection of the wheel axle speed. The rope pulley facilitates detection and triggering of falls, overspeed, and slippage. The design of two magnetic encoders provides calibration and redundancy, ensuring the accuracy and reliability of electronic detection and triggering. In addition, to avoid magnetic interference between the encoder and the magnet, shielding covers are installed on the left and right uprights, corresponding to the left and right ends of the wheel axle. These shielding covers are located outside the magnet and its corresponding encoder. This speed limiter uses electrical detection and triggering to achieve electronic detection and triggering. The electronic trigger drives the linkage mechanism, thereby achieving the braking action of the braking component. The action is sensitive and can be triggered even at low speeds, overcoming the shortcomings of mechanical speed limiter triggering.

[0003] The electronic speed limiter with the above structure still has the following drawbacks: Since it uses an encoder to detect the wheel axle speed and adopts a design with two magnetic encoders to achieve calibration and redundancy, ensuring the accuracy and reliability of electronic detection and triggering, although this method of using a purely electrical structure to detect overspeed can achieve the goal, there are still reliability issues.

[0004] This disclosure discloses an electronic bidirectional elevator speed governor, comprising a speed governor housing, a rope pulley, and a rope clamp. The rope pulley is rotatably connected inside the speed governor housing. The key feature is that a ratchet, rotating synchronously with the rope pulley, is connected to the rope pulley. A rotatable disc is disposed on one side of the ratchet. A drive motor is mounted on the disc's surface away from the ratchet. The drive motor's drive end is connected to a gear, which is connected to a rack perpendicular to the disc's surface. A push rod is connected to the rack's end near the ratchet. The push rod can pass through the disc and insert into the ratchet's gap. An arc groove is also formed on the disc, into which a fixing pin is inserted. The fixing pin is fixedly connected to the speed governor housing. The rope clamp is pinned to the disc and can rotate around the pin's connection point. The drive motor is electrically connected to a controller, which is electrically connected to the elevator traction machine and an elevator speed detector. In case of overspeed, when the elevator exceeds its speed limit, the elevator speed detector sends a signal to the controller. The controller then controls the drive motor to drive the gear and rack, pushing the push rod into the ratchet's gap and clamping the ratchet. This type of electronic speed limiter has the following disadvantages: after the overspeed signal is sent to the controller, the controller controls the drive motor to drive the gear rack, which replaces the original ratchet and pawl interlocking under the action of centrifugal force. It adopts an electrical structure drive, which also uses the electrical overspeed signal to achieve braking through a mechanical mechanism. The structure is relatively complex, and the braking effect and braking reliability are generally not very good. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide an electronic speed limiter for elevators that adds a disc for speed measurement and braking, measures speed by detecting the on / off state of the disc's sidewall when a proximity switch passes through it, and when an overspeed occurs, a mechanical action is performed by an electromagnet falling down and locking the disc. After the mechanical action, the disc rotates and triggers the lower switch to operate. The overspeed electrical switch outputs simultaneously through the lower switch and the circuit board electronic switch, resulting in a more reliable and effective braking system.

[0006] The technical solution of this invention is to provide an electronic speed governor for an elevator with the following structure: a frame, a sheave, a first disc, and a control board; the sheave rotates on the frame via a central shaft; characterized in that: a second disc is provided between the sheave and the first disc, the second disc and the sheave are coaxially mounted and rotate synchronously; the electronic speed governor synchronously outputs a first overspeed signal and a second overspeed signal in a triggered state; the output of the first overspeed signal means that, during overspeed, the sheave and the second disc rotate at overspeed, the signal detected by the sensor of the overspeed of the second disc is transmitted to the control board, and the control board outputs the first overspeed signal; the output of the second overspeed signal means that, simultaneously with the output of the first overspeed signal, a mechanical structure brakes the second disc, and before stopping, the second disc rotates at a certain angle and drives the first disc to trigger a switch on the frame to output the second overspeed signal.

[0007] The second disk has several protrusions evenly distributed along its circumference on its sidewall, with a notch between adjacent protrusions. A proximity switch and a control board are mounted on the frame. The proximity switch is electrically connected to the control board and is located near the outer sidewall of the second disk. As the second disk rotates, the protrusions and notches sequentially approach the proximity switch. Each protrusion facing the proximity switch indicates "on," and each notch facing the proximity switch indicates "off." The proximity switch records the on / off frequencies and converts them into signals, which are simultaneously transmitted to the control board and compared with an overspeed signal set by the control board. The first disk has one or more sets of electromagnets. The piston rod of each set of electromagnets has a driving end at its outer end, facing downwards. In the initial state, the driving end is located above the second disk. In the triggered state, the electromagnet receives an overspeed signal from the control board and starts. The driving end extends downwards and embeds into one of the notches, stopping the second disk. Simultaneously, the control board issues a first overspeed signal.

[0008] A switch is provided at the bottom of the frame. The trigger end of the switch passes through the first disk. The first disk has a groove, and the trigger end passes through the groove. When overspeed occurs, the first disk rotates and causes the side wall of the groove to drive the trigger end of the switch to output a second overspeed signal.

[0009] The second disk is a gear disk, the protrusion is the tooth of the gear disk, and the proximity switch compares the rotational speed of the gear disk with the set speed.

[0010] The first disc is equipped with two sets of electromagnets, and the driving ends of the two are arranged in a V-shape. When the speed exceeds the limit, they extend synchronously and embed into a corresponding notch to stop the second disc.

[0011] The drive end has an adjustment structure for adjusting the extension distance, and in the initial state there is a gap between the end of the drive end and the outer end of the protrusion of the second disk.

[0012] The first disk has a guide structure inside, and the drive end moves through the guide structure.

[0013] The first disk has an arc-shaped groove, and the proximity switch passes through the arc-shaped groove and approaches the end face of the second disk.

[0014] With the above structure, the present invention has the following advantages: When overspeeding, the rope wheel rotates, and the second disc rotates synchronously. Speed ​​is measured by detecting the outer wall of the second disc through a proximity switch, and the speed is measured by the on / off state of the switch. When overspeeding, the electromagnet falls and jams the second disc to stop it, which is a mechanical action. After the mechanical action, the second disc rotates, triggering the lower switch to act as an electrical action. The overspeed electrical switch outputs simultaneously through the lower switch and the circuit board electronic switch; that is, the electronic speed limiter synchronously outputs the first overspeed signal and the second overspeed signal in the triggered state. When overspeeding, the rope wheel and the second disc rotate at overspeed. The signal detected by the sensor when the second disc is overspeeding is transmitted to the control board, and the control board outputs the first overspeed signal. At the same time, the mechanical structure brakes the second disc. Before stopping, the second disc rotates at a certain angle and drives the first disc to trigger the switch on the frame to output the second overspeed signal. This use of the overspeed electrical switch outputting simultaneously through the lower switch and the circuit board electronic switch further ensures that the rope wheel can be effectively stopped when overspeeding, improving reliability and stopping effect. Attached Figure Description

[0015] Figure 1 This is a front split diagram of the electronic speed governor of the elevator according to the present invention.

[0016] Figure 2 This is a schematic diagram of the rear split of the electronic speed limiter for the elevator of the present invention.

[0017] Figure 3 This is a schematic diagram of the back of the electronic speed limiter for the elevator of the present invention.

[0018] Figure 4 This is a front view of the electronic speed limiter for the elevator of the present invention.

[0019] Figure 5 This is an internal schematic diagram of the electronic speed governor of the elevator according to the present invention.

[0020] The following components are shown in the figure: 1. Frame, 2. Sheave, 3. First disc, 4. Second disc, 5. Protrusion, 6. Notch, 7. Proximity switch, 8. Control board, 9. Electromagnet, 10. Drive end, 11. Switch, 12. Trigger end, 13. Groove, 14. Arc groove. Detailed Implementation

[0021] The invention will now be further described with reference to the accompanying drawings.

[0022] like Figure 1-5 As shown, an electronic speed governor for an elevator according to the present invention includes a frame 1, a pulley 2, a first disc 3, and a control board 8; the pulley 2 rotates on the frame 1 via a central shaft; the frame 1 is U-shaped and consists of a front vertical plate, a bottom plate, and a back vertical plate. The central shaft is mounted on the front vertical plate and the back vertical plate of the frame 1.

[0023] A second disk 4 is provided between the rope wheel 2 and the first disk 3. The second disk 4 is a gear disk. The side wall of the second disk 4 is provided with a plurality of protrusions 5 evenly distributed along the circumference. There is a notch 6 between two adjacent protrusions 5. The protrusions 5 are the teeth of the gear disk.

[0024] The frame 1 is equipped with a proximity switch 7 and a control board 8. The proximity switch 7 is electrically connected to the control board 8. The proximity switch 7 is close to the outer wall of the second disk 4. When the second disk 4 rotates, it sequentially approaches the proximity switch 7 with the protrusion 5 and the notch 6. The proximity switch 7 compares the rotation speed of the gear disk with the set speed. Each protrusion 5 facing the proximity switch 7 indicates that the speed is on, and each notch 6 facing the proximity switch 7 indicates that the speed is off. The proximity switch 7 records the frequency of on and off and converts it into a signal, which is simultaneously transmitted to the control board 8 and compared with the overspeed signal set by the control board 8.

[0025] The second disc 4 is coaxially mounted with the rope wheel 2 and the two rotate synchronously; the electronic speed limiter outputs a first overspeed signal and a second overspeed signal synchronously in the triggered state; when overspeeding occurs, the rope wheel 2 and the second disc 4 rotate at overspeed, the signal of the overspeed of the second disc 4 detected by the sensor is transmitted to the control board 8 and the control board 8 outputs the first overspeed signal, and at the same time the mechanical structure brakes the second disc 4. Before stopping, the second disc 4 rotates at a certain angle and drives the first disc 3 to trigger the switch on the frame 1 to output the second overspeed signal.

[0026] The first disc 3 is equipped with one or more sets of electromagnets 9. Two sets of electromagnets 9 are provided on the first disc 3. Each set of electromagnets 9 has a driving end 10 at the outer end of its piston rod, with the driving end 10 facing downwards. The driving ends 10 of the two sets of electromagnets 9 are arranged in a V-shape. When the second disc 4 stops, the two driving ends 10 can respectively engage with corresponding notches 6. When overspeeding, they extend synchronously and engage with a corresponding notch 6 to stop the second disc 4.

[0027] In the initial state, the drive end 10 is located above the second disk 4. In the triggered state, the electromagnet 9 receives an overspeed signal from the control board 8 and starts. The drive end 10 extends downward and embeds into one of the notches 6 and stops the second disk 4. At the same time, the control board 8 sends a first overspeed signal.

[0028] The bottom of the frame 1 is provided with a switch 11, and the trigger end 12 of the switch 11 passes through the first disk 3. The first disk 3 is provided with a groove 13, and the trigger end 12 passes through the groove 13. When overspeeding occurs, the first disk 3 rotates and causes the side wall of the groove 13 to drive the trigger end 12 of the switch 11 to output a second overspeed signal.

[0029] The drive end 10 has an adjustment structure for adjusting the extension distance. In the initial state, there is a gap between the end of the drive end 10 and the outer end of the protrusion 5 of the second disk 4.

[0030] The first disk 3 has a guide structure inside, and the driving end 10 moves through the guide structure. The guide structure is a guide block with a rectangular through hole, and the driving end 10 passes through the rectangular through hole.

[0031] The first disk 3 is provided with an arc-shaped groove 14, and the proximity switch 7 passes through the arc-shaped groove 14 and approaches the end face of the second disk 4.

[0032] The working principle of the electronic speed limiter of this invention:

[0033] When overspeed occurs, proximity switch 7 detects that the rotation speed of the second disk 4 exceeds the limit and sends an overspeed signal to control board 8. Control board 8 sends a signal to two sets of electromagnets 9, causing the drive ends 10 of the two sets of electromagnets 9 to extend. The drive end 10 of each set extends downward and embeds into a corresponding notch 6, thus stopping the second disk 4.

[0034] Before stopping, the second disc 4 rotates at a certain angle and drives the first disc 3 to trigger the switch 11 below the frame 1, and outputs the second overspeed signal.

Claims

1. An electronic speed governor for an elevator, comprising a frame (1), a pulley (2), a first disc (3), and a control board (8); the pulley (2) rotates on the frame (1) via a central shaft; characterized in that: A second disk (4) is provided between the rope wheel (2) and the first disk (3). The second disk (4) is coaxially mounted with the rope wheel (2) and the two rotate synchronously. The electronic speed limiter outputs a first overspeed signal and a second overspeed signal synchronously when overspeeding occurs. The output of the first overspeed signal means that when overspeed occurs, the rope wheel (2) and the second disc (4) rotate at overspeed, the signal of the second disc (4) being detected by the sensor is transmitted to the control board (8) and the control board (8) outputs the first overspeed signal. The output of the second overspeed signal means that while the first overspeed signal is output, the mechanical structure brakes the second disc (4). Before stopping, the second disc (4) rotates at a certain angle and drives the first disc (3) to trigger the switch on the frame (1) to output the second overspeed signal.

2. The electronic speed governor for an elevator according to claim 1, characterized in that: The second disk (4) has several protrusions (5) evenly distributed along its circumference on its side wall. There is a notch (6) between two adjacent protrusions (5). The frame (1) is equipped with a proximity switch (7) and a control board (8). The proximity switch (7) is electrically connected to the control board (8). The proximity switch (7) is close to the outer side wall of the second disk (4). When the second disk (4) rotates, it approaches the proximity switch (7) in sequence with the protrusions (5) and the notch (6). Each protrusion (5) facing the proximity switch (7) is on, and each notch (6) facing the proximity switch (7) is off. The proximity switch (7) records the frequency of on and off states. And convert it into a signal, and transmit it to the control board (8) and compare it with the overspeed signal set by the control board (8); the first disk (3) is provided with a group of more than one set of electromagnets (9), and the piston rod of each set of electromagnets (9) is provided with a drive end (10) at the outer end. The drive end (10) faces downward. In the initial state, the drive end (10) is located above the second disk (4). In the trigger state, the electromagnet (9) receives the overspeed signal from the control board (8) and starts. The drive end (10) extends downward and is embedded in one of the notches (6) and stops the second disk (4). At the same time, the control board (8) sends out the first overspeed signal.

3. The electronic speed governor for an elevator according to claim 1, characterized in that: The bottom of the frame (1) is provided with a switch (11), the trigger end (12) of the switch (11) passes through the first disk (3), the first disk (3) is provided with a groove (13), the trigger end (12) passes through the groove (13), when overspeed occurs, the first disk (3) rotates and the side wall of the groove (13) drives the trigger end (12) of the switch (11) to output a second overspeed signal.

4. The electronic speed governor for an elevator according to claim 2, characterized in that: The second disk (4) is a gear disk, the protrusion (5) is the tooth of the gear disk, and the proximity switch (7) compares the rotational speed of the gear disk with the set speed.

5. An electronic speed governor for an elevator according to claim 2, characterized in that: The first disc (3) is equipped with two sets of electromagnets (9), and the driving ends (10) of the two are arranged in a V shape. When the speed exceeds the limit, they extend synchronously and embed into a corresponding notch (6) to stop the second disc (4).

6. An electronic speed governor for an elevator according to claim 2 or 5, characterized in that: The drive end (10) has an adjustment structure for adjusting the extension distance, and in the initial state there is a gap between the end of the drive end (10) and the outer end of the protrusion (5) of the second disk (4).

7. An electronic speed governor for an elevator according to claim 2 or 5, characterized in that: The first disk (3) has a guide structure inside, and the drive end (10) moves through the guide structure.

8. An electronic speed governor for an elevator according to claim 2, characterized in that: The first disk (3) is provided with an arc-shaped groove (14), and the proximity switch (7) passes through the arc-shaped groove (14) and approaches the end face of the second disk (4).

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