An elevator overspeed governor using hydraulic braking and electromagnetic clamping and a control method thereof

Abstract

This invention discloses an elevator speed governor employing hydraulic braking and electromagnetic clamping, relating to the field of elevator safety facilities technology. It includes a first speed-limiting mechanism and / or a second speed-limiting mechanism. A rotating shaft for fixing the speed governor wheel is rotatably mounted on a frame. The output end of the first speed-limiting mechanism acts on the rotating shaft, limiting its rotation. The output end of the second speed-limiting mechanism acts on both sides of the speed governor wheel, limiting its rotation. The first speed-limiting mechanism is a hydraulically driven disc-type clamping mechanism controlled by a motor, gear, and rack structure. The second speed-limiting mechanism is a pressure block-type clamping mechanism that utilizes electromagnetic attraction and spring force to initiate speed limiting, braking, and resetting. It features a simple structure, strong anti-interference capability, rapid and reliable speed-limiting action, adjustable braking force, and no need for manual resetting, effectively ensuring elevator operational safety and adapting to different working environments.

Description

Technical Field

[0001] This invention relates to the field of elevator safety facilities technology, specifically to a structure and control method for elevator braking and speed limiting. Background Technology

[0002] Vertical elevators are widely used in various buildings and locations, providing an efficient and convenient means of vertical transportation to meet people's needs for going up and down in daily life and work. The reliability of elevator operation is directly related to the safety of passengers and goods. The speed governor installed in the elevator is an important facility to ensure the safe operation of the elevator. It quickly activates when the elevator is rapidly descending or stalling due to emergency situations such as broken traction steel wire ropes or elevator control system failures, slowing down the elevator's descent speed or stopping the descent process. It can effectively eliminate the safety hazards to people and property caused by the elevator falling, and avoid damage to the elevator equipment from falling.

[0003] Based on existing technology searches, the following known technical solutions exist:

[0004] Prior art 1: Application number: CN202410597063.3, application date: 2024.05.14, publication date (publication): 2024.07.05.

[0005] Prior art 1 relates to an elevator brake block and braking assembly, which includes a transmission device, a carrying box, a fixed rod, a fixed plate, a fixed frame, a mounting plate, a braking device, an auxiliary device, etc. The auxiliary device includes a housing, and a rotating rod is provided inside the housing. The auxiliary device enables a U-shaped clamp to hold the fixed rod when the wire rope breaks, so that when there are a large number of people in the carrying box, the brake block body can completely stop the carrying box and prevent it from falling again.

[0006] However, the overall structure of the existing technology 1 is too complex, and failure of some parts of the structure may directly lead to device malfunction and unreliable operation.

[0007] Prior art 2:

[0008] Application number: CN202410438254.5, application date: 2024.04.12, publication date (publication): 2024.06.07.

[0009] Prior art 2 discloses a bidirectional vertical elevator stall protection device and its control method, which includes a frame, a wheel, a braking mechanism and a toggle mechanism. The braking mechanism includes a swing arm, a swing shaft and a pressure block. The toggle mechanism includes a drive motor, a pawl, a connecting rod, a spring and a guide column. When the elevator overspeeds, the drive motor outputs to drive the pawl to rotate and engage with the ratchet. Under the drive of the toggle mechanism, the swing arm drives the pressure block to swing towards the wheel to press the rotating pair of the wire rope.

[0010] However, the braking mechanism of the existing technology 2 relies on a purely mechanical mechanism to transmit power, which has the drawbacks of long reaction time and insufficient braking speed, and the magnitude of the braking force is not adjustable.

[0011] Existing technology 3:

[0012] Application number: CN202310541781.4, application date: 2023.05.15, publication date (publication): 2023.07.25.

[0013] Prior art 3 discloses a safety protection device for a construction elevator, including a guide rail 1, a slider 1, a speed limiting locking device, a guide rail 2, a slider 2, an elastic pad, and a buffer device. In this invention, when the car experiences a stall and accelerates downwards, gear 1 drives the drive shaft to rotate at high speed. The high-speed rotation of the drive shaft causes the speed limiting block to break free from the tension of the tension spring and move outwards to lock onto the inner wall of the sleeve for deceleration. This ensures that the car can only move at a safe speed, thus achieving the effect of real-time elevator protection. In this invention, when the car continues to stall and accelerate downwards after decelerating after transporting heavy materials or equipment, the sleeve will break free from the frictional resistance of the overload locking block and the overload locking groove and rotate. The rotation of the sleeve will drive the screw to rotate through gear 2. The rotation of the screw will cause the telescopic block to extend and cause the brake block to lock onto guide rail 1 and guide rail 2 for locking. This will completely prevent the car from moving, thus facilitating maintenance personnel to repair the elevator.

[0014] However, the existing technology 3 relies on multiple tension springs to control the position of the speed limiter, which is prone to fatigue damage, and the reliability of the car speed limiter cannot be guaranteed under long-term use. Summary of the Invention

[0015] To avoid the shortcomings of the prior art, the present invention provides an elevator speed governor and its control method that employs hydraulic braking and electromagnetic clamping.

[0016] The present invention adopts the following technical solution to solve the technical problem: an elevator speed limiter using hydraulic braking and electromagnetic clamping, wherein the rotating shaft of the speed limiter wheel is rotatably mounted on the frame, the outer edge of the speed limiter wheel is provided with a wheel groove, and the steel wire rope for traction elevator is tensioned and wound in the upper half of the wheel groove, and a first speed limiting mechanism and / or a second speed limiting mechanism are provided.

[0017] The output end of the first speed limiting mechanism acts on the rotating shaft to restrict the rotation of the rotating shaft; the output end of the second speed limiting mechanism acts on both sides of the speed limiter wheel to restrict the rotation of the speed limiter wheel.

[0018] Preferably, the first speed limiting mechanism includes a disc, a brake pad, and a brake pad drive structure;

[0019] The disc is mounted and fixed to the rotating shaft; a pair of brake pads, as the output ends of the first speed limiting mechanism, are arranged on both sides of the disc and are connected to the output end of the brake pad drive structure. They can move towards each other under the drive of the brake pad drive structure to clamp the disc and act on the rotating shaft to limit the rotation of the rotating shaft, or move away from each other to disengage from the disc and release the restriction on the rotation of the rotating shaft.

[0020] Preferably, the brake pad drive structure is a hydraulic drive structure comprising a first piston chamber, a first piston, a second piston chamber, a second piston, an oil pipe, a bracket, and a linear mechanism;

[0021] A pair of second piston chambers are symmetrically arranged on both sides of the disc and are fixed to the frame by the bracket; a pair of second pistons are respectively fitted into a pair of second piston chambers and respectively fixed to a pair of brake pads; a pair of second pistons and a pair of second piston chambers form a sliding pair that supports the principle of the pair of brake pads moving towards each other or moving away from each other.

[0022] The first piston is fitted into the first piston chamber, and a sliding pair is formed between them to support the first piston to move linearly forward or backward within the first piston chamber;

[0023] The front end of the first piston chamber is connected to the outer end of a pair of second piston chambers through the oil pipe. The first piston is installed and connected to the output end of the linear mechanism and can move forward in the first piston chamber under the drive of the linear mechanism to drive the pair of brake pads to move towards each other or move backward to drive the pair of brake pads to move away from each other.

[0024] Preferably, the linear mechanism includes a motor, gears and racks, and guide rails;

[0025] The fixed end of the motor is mounted and fixed to the frame, the gear is coaxially mounted and fixed to the output shaft of the motor, and the rack serves as the output end of the linear mechanism, meshes with the gear, and is slidably mounted in the guide rail.

[0026] A sliding pair is formed between the rack and the guide rail to support the rack moving forward or backward along the guide rail, thereby driving the first piston to move forward and backward within the first piston chamber.

[0027] Preferably, the second speed limiting mechanism includes a fixed plate, a fixed shaft, a return spring, an armature, an iron core, a coil, a brake arm, and a rope pressing block;

[0028] The fixed shaft is located above the speed limiter wheel and is connected to the frame via a pair of fixed plates fixed at both ends. A pair of rope-pressing blocks, serving as the output ends of the second speed limiting mechanism, are located on both sides of the outer edge of the speed limiter wheel and are respectively connected and fixed to a pair of armatures via a pair of brake arms to form an integral structure. A pair of armatures are slidably mounted on the fixed shaft and are respectively connected to a pair of fixed plates via a pair of return springs. The iron core wound with the coil is located between the pair of armatures and is sleeved and fixed to the fixed shaft.

[0029] A sliding pair is formed between the pair of armatures and the fixed shaft to support the pair of rope pressing blocks to move towards each other or away from each other. This allows the pair of rope pressing blocks to move towards each other under the attraction of the iron core and coil on the pair of armatures, clamping the speed limiter wheel and restricting its rotation, or to move away from each other under the elastic force of the pair of return springs, releasing the restriction on the speed limiter wheel's rotation.

[0030] Preferably, it also includes a pair of locking bolts;

[0031] The fixed shaft is installed and fixed at both ends by a pair of locking bolts and a pair of fixed plates.

[0032] Preferably, it also includes a controller, a magnet, and a magnetic proximity switch;

[0033] The magnet is mounted and fixed to the surface of the speed limiter wheel, and the magnetic proximity switch is mounted and fixed to the frame corresponding to the position of the magnet;

[0034] The controller is connected to the first speed limiting mechanism, the second speed limiting mechanism, and the magnetic proximity switch via data communication.

[0035] Preferably, the frame has a U-shaped groove structure formed by connecting a base plate and a pair of side plates, and the speed limiter wheel is located between the pair of side plates; the rotating shaft is rotatably connected to the frame through a pair of bearings.

[0036] A method for controlling an elevator speed governor using hydraulic braking and electromagnetic clamping, comprising the following steps:

[0037] The first step is that during the elevator's operation, the magnetic proximity switch detects the signal from the magnet in real time, and the controller obtains the real-time speed v of the elevator car based on the frequency at which the magnet triggers the magnetic proximity switch.

[0038] The second step is for the controller to compare the real-time speed v with the preset safe speed v0:

[0039] If \(1.15v_0\leq v\), then proceed to the third step;

[0040] If \(v_0\leq v < 1.15v_0\), the main control system of the elevator sends a deceleration braking signal to the power mechanism of the elevator. The brake pads of the power mechanism are pressed against the output end of the power mechanism to achieve mechanical braking of the elevator car until the elevator car stops moving, waiting for maintenance by the staff, or until \(1.15v_0\leq v\), then proceed to the third step;

[0041] Otherwise, if \(v < v_0\), the elevator operates normally;

[0042] In the third step, the controller controls the first speed limiting mechanism and / or the second speed limiting mechanism to start and jointly brake the elevator car;

[0043] In the first speed limiting mechanism, the linear mechanism drives the first piston to move forward in the first piston cylinder, transmitting the positive pressure to a pair of second piston chambers, causing the pair of second pistons to move towards each other and clamp the disc, restricting the rotation of the disc;

[0044] In the second speed limiting mechanism, when the coil is energized, a pair of armatures move towards each other and approach under the action of the electromagnetic attraction formed by the iron core and the coil,带动 a pair of rope pressing blocks to move towards each other and clamp the governor wheel disc, restricting the rotation of the governor wheel disc;

[0045] Until the elevator car stops moving, the elevator is repaired;

[0046] In the fourth step, after the elevator is repaired, the controller controls the first speed limiting mechanism and / or the second speed limiting mechanism to reset;

[0047] In the first speed limiting mechanism, the linear mechanism drives the first piston to move backward in the first piston cylinder, transmitting the negative pressure to a pair of second piston chambers, causing the pair of second pistons to move away from each other and reset, disengaging from the disc,解除 the restriction on the rotation of the disc;

[0048] In the second speed limiting mechanism, when the coil is de-energized, a pair of armatures move away from each other and reset under the action of the elastic force of a pair of return springs,带动 a pair of rope pressing blocks to move away from each other and reset, disengaging from the governor wheel disc,解除 the restriction on the rotation of the governor wheel disc.

[0049] The present invention provides an elevator speed limiter and its control method using hydraulic braking and electromagnetic clamping, having the following beneficial effects:

[0050] 1. The structure of the present invention is simple and has strong anti-interference ability. The first speed limiting mechanism and the second speed limiting mechanism act on the rotating shaft and the governor wheel disc respectively,实现 the braking and speed limiting of the elevator car in multiple forms, and can better adapt to different working environments.

[0051] 2. The first speed limiting mechanism of the present invention is a hydraulically driven disc clamping mechanism, which is controlled by a motor, gear, and rack structure. Compared with the centrifugal throwing mechanism in the prior art, it has the advantages of simpler structure, more reliable speed limiting action, and no need for manual reset.

[0052] 3. The second speed limiting mechanism of the present invention is a pressure block clamping mechanism that uses electromagnetic attraction and spring force to start speed limiting, braking and resetting. Compared with the centrifugal throwing block mechanism in the prior art, it has the advantages of rapid braking action, adjustable braking force and no need for manual resetting. It can quickly realize the braking of the elevator car and can avoid the injury of passengers in the elevator car due to excessive braking force by adjusting the braking force.

[0053] 4. This invention monitors the elevator car's speed in real time using magnets and magnetic proximity switches. The controller then controls the activation and reset of the first and / or second speed limiting mechanisms in a timely manner, taking into account the elevator's operating environment and the elevator car's speed. This effectively ensures the elevator's operational safety. Attached Figure Description

[0054] Figure 1 This is a schematic diagram of the isometric structure of the present invention;

[0055] Figure 2 This is a schematic diagram of the main structure of the present invention;

[0056] Figure 3 This is a cross-sectional view of the first speed limiting mechanism of the present invention at point BB;

[0057] Figure 4 This is a schematic diagram of the linear mechanism of the present invention.

[0058] Figure 5 This is a half-sectional schematic diagram of the second speed limiting mechanism of the present invention.

[0059] In the picture:

[0060] 1. Frame; 2. Speed ​​limiter wheel; 3. Shaft; 4. First speed limiting mechanism; 41. Disc; 42. Brake pad; 43. First piston chamber; 44. First piston; 45. Second piston chamber; 46. Second piston; 47. Oil pipe; 48. Bracket; 49. Linear mechanism; 491. Motor; 492. Gear; 493. Rack; 494. Guide rail; 5. Second speed limiting mechanism; 51. Fixing plate; 52. Fixing shaft; 53. Return spring; 54. Armature; 55. Iron core; 56. Coil; 57. Brake arm; 58. Rope pressing block; 59. Locking bolt; 6. Magnet; 7. Magnetic proximity switch. Detailed Implementation

[0061] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0062] An elevator speed governor that employs hydraulic braking and electromagnetic clamping, such as Figures 1-5 As shown, its structural relationship is as follows: the rotating shaft 3 of the speed limiter wheel 2 is rotatably installed on the frame 1, the outer edge of the speed limiter wheel 2 is provided with a wheel groove, the steel wire rope for traction elevator is tensioned and wound in the upper half of the wheel groove, and a first speed limiting mechanism 4 and / or a second speed limiting mechanism 5 are provided.

[0063] The output end of the first speed limiting mechanism 4 acts on the rotating shaft 3, limiting the rotation of the rotating shaft 3; the output end of the second speed limiting mechanism 5 acts on both sides of the speed limiter wheel 2, limiting the rotation of the speed limiter wheel 2.

[0064] Preferably, the first speed limiting mechanism 4 includes a disc 41, a brake pad 42, and a brake pad drive structure;

[0065] The disc 41 is mounted and fixed on the rotating shaft 3; a pair of brake pads 42 serve as the output ends of the first speed limiting mechanism 4, and are arranged on both sides of the disc 41. They are installed and connected to the output ends of the brake pad drive structure, and can move towards each other under the drive of the brake pad drive structure to clamp the disc 41 to act on the rotating shaft 3 to limit the rotation of the rotating shaft 3, or move away from each other to disengage from the disc 41 to release the restriction on the rotation of the rotating shaft 3.

[0066] Preferably, the brake pad drive structure is a hydraulic drive structure including a first piston chamber 43, a first piston 44, a second piston chamber 45, a second piston 46, an oil pipe 47, a bracket 48, and a linear mechanism 49.

[0067] A pair of second piston chambers 45 are symmetrically arranged on both sides of the disc 41 and are fixed to the frame 1 by bracket 48; a pair of second pistons 46 are respectively installed in the pair of second piston chambers 45 and are respectively fixed to a pair of brake pads 42. A pair of second pistons 46 and a pair of second piston chambers 45 form a sliding pair that supports the principle of the pair of brake pads 42 moving towards each other or moving away from each other.

[0068] The first piston 44 is fitted into the first piston chamber 43, and a sliding pair is formed between them to support the first piston 44 to move forward or backward linearly within the first piston chamber 43.

[0069] The front end of the first piston chamber 43 is connected to the outer end of a pair of second piston chambers 45 through an oil pipe 47. The first piston 44 is installed and connected to the output end of the linear mechanism 49, and can move forward in the first piston chamber 43 under the drive of the linear mechanism 49 to drive a pair of brake pads 42 to move towards each other or move backward to drive a pair of brake pads 43 to move away from each other.

[0070] Preferably, the linear mechanism 49 includes a motor 491, a gear 492 and a rack 493 and a guide rail 494;

[0071] The fixed end of the motor 491 is installed and fixed to the frame 1. The gear 492 is coaxially installed and fixed to the output shaft of the motor 491. The rack 493 serves as the output end of the linear mechanism 49, meshes with the gear 492, and is slidably installed in the guide rail 494.

[0072] A sliding pair is formed between the rack 493 and the guide rail 494 to support the rack 493 to move forward or backward along the guide rail 494, thereby driving the first piston 44 to move forward and backward within the first piston chamber 43.

[0073] Preferably, the second speed limiting mechanism 5 includes a fixed plate 51, a fixed shaft 52, a return spring 53, an armature 54, an iron core 55, a coil 56, a brake arm 57, and a rope pressing block 58;

[0074] The fixed shaft 52 is located above the speed limiter wheel 2 and is connected to the frame 1 by a pair of fixed plates 51 fixed at both ends. A pair of rope pressing blocks 58 serve as the output ends of the second speed limiting mechanism 5. They are located on both sides of the outer edge of the speed limiter wheel 2 and are connected and fixed to a pair of armatures 54 by a pair of brake arms 57 to form an integral structure. A pair of armatures 54 are slidably mounted on the fixed shaft 52 and are connected to a pair of fixed plates 51 by a pair of return springs 53. An iron core 55 with a coil 56 wound around it is located between the pair of armatures 54 and is sleeved and fixed to the fixed shaft 52.

[0075] A sliding pair is formed between a pair of armatures 54 and a fixed shaft 52 to support a pair of rope pressing blocks 58 to move toward each other or away from each other. This supports the pair of rope pressing blocks 58 to move toward each other under the attraction of the iron core 55 and the coil 56 on the pair of armatures 54, clamping the speed limiter wheel 2 and restricting its rotation, or to move away from each other under the elastic force of a pair of return springs 53, disengaging from the speed limiter wheel 2 and releasing the restriction on the rotation of the speed limiter wheel 2.

[0076] Preferably, it also includes a pair of locking bolts 59;

[0077] The fixed shaft 52 is installed and fixed at both ends by a pair of locking bolts 59 and a pair of fixing plates 51.

[0078] Preferably, it also includes a controller, a magnet 6, and a magnetic proximity switch 7;

[0079] The magnetic steel 6 is installed and fixed on the disk surface of the speed limiter wheel 2, and the magnetic proximity switch 7 is installed and fixed on the frame 1 corresponding to the position of the magnetic steel 6;

[0080] The controller is in data communication with the first speed limiting mechanism 4, the second speed limiting mechanism 5 and the magnetic proximity switch 7.

[0081] Preferably, the frame 1 has a U-shaped groove structure formed by connecting a bottom plate and a pair of side plates, and the speed limiter wheel 2 is located between the pair of side plates; the rotating shaft 3 is rotationally installed and connected to the frame 1 through a pair of bearings.

[0082] A control method for an elevator speed limiter using hydraulic braking and electromagnetic clamping, using the above elevator speed limiter with hydraulic braking and electromagnetic clamping for elevator speed limiting, includes the following steps:

[0083] In the first step, during the operation of the elevator, the magnetic proximity switch 7 detects the signal of the magnetic steel 6 in real time, and the controller obtains the real-time speed v of the elevator car moving according to the frequency of the magnetic steel 6 triggering the magnetic proximity switch 7;

[0084] In the second step, the controller compares the real-time speed v with the preset safety speed v0:

[0085] If 1.15v0 ≤ v, then proceed to the third step;

[0086] If v0 ≤ v < 1.15v0, the main control system of the elevator sends a deceleration braking signal to the power mechanism of the elevator, and the brake pads of the power mechanism are pressed tightly against the output end of the power mechanism to achieve the mechanical braking of the elevator car until the elevator car stops moving, waiting for the staff to repair, or until 1.15v0 ≤ v, then proceed to the third step;

[0087] Otherwise, v < v0, the elevator runs normally;

[0088] In the third step, the controller controls the first speed limiting mechanism 4 and / or the second speed limiting mechanism 5 to start, and jointly brakes the elevator car;

[0089] In the first speed limiting mechanism 4, the linear mechanism 49 drives the first piston 44 to move forward in the first piston cylinder 43, and transmits the positive pressure to a pair of second piston chambers 45, so that a pair of second pistons 46 move towards each other to clamp the disc 41 and limit the rotation of the disc 41;

[0090] In the second speed limiting mechanism 5, the coil 56 is energized, and a pair of armatures 54 move towards each other and approach under the action of the electromagnetic attraction formed by the iron core 55 and the coil 56, and drive a pair of rope pressing blocks 58 to move towards each other to clamp the speed limiter wheel 2 and limit the rotation of the speed limiter wheel 2;

[0091] Until the elevator car stops moving, the elevator is repaired;

[0092] Fourth step: After the elevator maintenance is completed, the controller controls the first speed limiting mechanism 4 and / or the second speed limiting mechanism 5 to reset.

[0093] In the first speed limiting mechanism 4, the linear mechanism 49 drives the first piston 44 to move backward in the first piston cylinder 43, transmitting negative pressure to a pair of second piston chambers 45, causing the pair of second pistons 46 to move back to their original positions, disengage from the disc 41, and release the restriction on the rotation of the disc 41.

[0094] In the second speed limiting mechanism 5, when the coil 56 is de-energized, a pair of armatures 54 move away from the reset under the elastic force of a pair of reset springs 53, which drives a pair of rope pressing blocks 58 away from the reset and disengages from the speed limiter wheel 2, thus releasing the restriction on the rotation of the speed limiter wheel 2.

[0095] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0096] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An elevator speed governor employing hydraulic braking and electromagnetic clamping, wherein a rotating shaft (3) for mounting and fixing a speed governor wheel (2) is rotatably mounted on a frame (1), and a groove is formed on the outer edge of the speed governor wheel (2) for tensioning and winding the steel wire rope for traction elevator within the upper half of the groove, characterized in that: It is equipped with a first speed limiting mechanism (4) and a second speed limiting mechanism (5); The output end of the first speed limiting mechanism (4) acts on the rotating shaft (3) to restrict the rotation of the rotating shaft (3); the output end of the second speed limiting mechanism (5) acts on both sides of the speed limiter wheel (2) to restrict the rotation of the speed limiter wheel (2); The first speed limiting mechanism (4) includes a disc (41), a brake pad (42), and a brake pad drive structure; The disc (41) is mounted and fixed to the rotating shaft (3); a pair of brake pads (42) serve as the output ends of the first speed limiting mechanism (4), are arranged on both sides of the disc (41), and are connected to the output end of the brake pad drive structure. They can move towards each other under the drive of the brake pad drive structure to clamp the disc (41) to act on the rotating shaft (3) to restrict the rotation of the rotating shaft (3), or move away from each other to disengage from the disc (41) to release the restriction on the rotation of the rotating shaft (3); The brake pad drive structure is a hydraulic drive structure comprising a first piston chamber (43), a first piston (44), a second piston chamber (45), a second piston (46), an oil pipe (47), a bracket (48), and a linear mechanism (49); A pair of second piston chambers (45) are symmetrically arranged on both sides of the disc (41) and are fixed to the frame (1) by the bracket (48); a pair of second pistons (46) are respectively fitted into the pair of second piston chambers (45) and respectively fixed to the pair of brake pads (42); a pair of second pistons (46) and a pair of second piston chambers (45) form a sliding pair that supports the principle of the pair of brake pads (42) moving towards each other or moving away from each other; The first piston (44) is fitted into the first piston cavity (43), and a sliding pair is formed between them to support the first piston (44) to move forward or backward linearly within the first piston cavity (43); The front end of the first piston chamber (43) is connected to the outer end of a pair of second piston chambers (45) through the oil pipe (47). The first piston (44) is installed and connected to the output end of the linear mechanism (49), and can move forward in the first piston chamber (43) under the drive of the linear mechanism (49) to drive a pair of brake pads (42) to move towards each other or move backward to drive a pair of brake pads (42) to move away from each other. The linear mechanism (49) includes a motor (491), a gear (492), a rack (493), and a guide rail (494). The fixed end of the motor (491) is installed and fixed to the frame (1), the gear (492) is coaxially installed and fixed to the output shaft of the motor (491), and the rack (493) serves as the output end of the linear mechanism (49), meshes with the gear (492), and is slidably installed in the guide rail (494). A sliding pair is formed between the rack (493) and the guide rail (494) to support the rack (493) to move forward or backward along the guide rail (494) to drive the first piston (44) to move forward and backward within the first piston chamber (43); The second speed limiting mechanism (5) includes a fixed plate (51), a fixed shaft (52), a return spring (53), an armature (54), an iron core (55), a coil (56), a brake arm (57), and a rope pressing block (58); The fixed shaft (52) is located above the speed limiter wheel (2) and is connected to the frame (1) by a pair of fixed plates (51) fixed at both ends. The pair of rope pressing blocks (58) serve as the output ends of the second speed limiting mechanism (5) and are located on both sides of the outer edge of the speed limiter wheel (2). They are connected and fixed to the pair of armatures (54) by a pair of brake arms (57) to form an integral structure. The pair of armatures (54) are slidably mounted on the fixed shaft (52) and are connected to the pair of fixed plates (51) by a pair of return springs (53). The iron core (55) with the coil (56) wound around it is located between the pair of armatures (54) and is sleeved and fixed to the fixed shaft (52). A sliding pair is formed between the pair of armatures (54) and the fixed shaft (52) to support the pair of rope pressing blocks (58) to move towards each other or away from each other, so as to support the pair of rope pressing blocks (58) to move towards each other under the attraction of the iron core (55) and the coil (56) on the pair of armatures (54) to clamp the speed limiter wheel (2) and restrict the rotation of the speed limiter wheel (2), or to move away from each other under the elastic force of the pair of return springs (53) to release the restriction on the rotation of the speed limiter wheel (2).

2. The elevator speed governor using hydraulic braking and electromagnetic clamping as described in claim 1, characterized in that: It also includes a pair of locking bolts (59); The fixed shaft (52) is fixed at both ends by a pair of locking bolts (59) and a pair of fixing plates (51).

3. An elevator speed governor employing hydraulic braking and electromagnetic clamping as described in claim 1, characterized in that: It also includes a controller, a magnet (6) and a magnetic proximity switch (7); The magnet (6) is installed and fixed on the surface of the speed limiter wheel (2), and the magnetic proximity switch (7) is installed and fixed on the frame (1) corresponding to the position of the magnet (6). The controller is connected to the first speed limiting mechanism (4), the second speed limiting mechanism (5) and the magnetic proximity switch (7) via data communication.

4. An elevator speed governor employing hydraulic braking and electromagnetic clamping as described in claim 1, characterized in that: The frame (1) is a U-shaped groove structure formed by connecting a bottom plate and a pair of side plates. The speed limiter wheel (2) is located between the pair of side plates. The rotating shaft (3) is rotatably connected to the frame (1) through a pair of bearings.

5. A method for controlling an elevator speed governor using hydraulic braking and electromagnetic clamping, wherein the elevator speed governor using hydraulic braking and electromagnetic clamping as described in any one of claims 1 to 4 is used to limit the speed of the elevator, characterized in that, Includes the following steps: In the first step, during the operation of the elevator, the magnetic proximity switch (7) detects the signal of the magnet (6) in real time, and the controller obtains the real-time speed v of the elevator car based on the frequency at which the magnet (6) triggers the magnetic proximity switch (7). The second step is for the controller to compare the real-time speed v with the preset safe speed v0: If \(1.15v_0\leq v\), then proceed to the third step; If \(v_0\leq v < 1.15v_0\), the main control system of the elevator sends a deceleration braking signal to the power mechanism of the elevator. The brake pads of the power mechanism are pressed tightly against the output end of the power mechanism to achieve the mechanical braking of the elevator car until the elevator car stops moving, waiting for maintenance by the staff, or until \(1.15v_0\leq v\), then proceed to the third step; Otherwise, if \(v < v_0\), the elevator runs normally; In the third step, the controller controls the first speed-limiting mechanism (4) and the second speed-limiting mechanism (5) to start and jointly brake the elevator car; In the first speed-limiting mechanism (4), the linear mechanism (49) drives the first piston (44) to move forward in the first piston chamber (43), transmitting the positive pressure to a pair of second piston chambers (45), causing a pair of second pistons (46) to move towards each other and clamp the disc (41), restricting the rotation of the disc (41); In the second speed-limiting mechanism (5), when the coil (56) is energized, a pair of armatures (54) move towards each other and approach under the electromagnetic attraction formed by the iron core (55) and the coil (56),带动 a pair of rope pressing blocks (58) to move towards each other and clamp the speed limiter wheel disc (2), restricting the rotation of the speed limiter wheel disc (2); Until the elevator car stops moving, the elevator is repaired; In the fourth step, after the elevator is repaired, the controller controls the first speed-limiting mechanism (4) and the second speed-limiting mechanism (5) to reset; In the first speed-limiting mechanism (4), the linear mechanism (49) drives the first piston (44) to move backward in the first piston chamber (43), transmitting the negative pressure to a pair of second piston chambers (45), causing a pair of second pistons (46) to move away from each other and reset, disengaging from the disc (41),解除 the restriction on the rotation of the disc (41); In the second speed-limiting mechanism (5), when the coil (56) is de-energized, a pair of armatures (54) move away from each other and reset under the elastic force of a pair of return springs (53),带动 a pair of rope pressing blocks (58) to move away from each other and reset, disengaging from the speed limiter wheel disc (2),解除 the restriction on the rotation of the speed limiter wheel disc (2).

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