Combined type overspeed protection device for elevator

Abstract

The invention discloses an elevator combined type overspeed protection device which comprises an overspeed protection device body, a traction wheel is installed on one side of the overspeed protection device body, a main shaft is inserted into the traction wheel in a penetrating mode, a speed reduction disc is fixedly arranged on the outer ring face of the main shaft, and a detection disc is fixedly arranged in the traction wheel. A detection wheel is installed on the upper side of the detection disc, a wheel speed detection device is arranged on one side of the detection wheel, a fixing frame is fixedly arranged on one side of the wheel speed detection device, and an overspeed protection device body is installed on the right side of the fixing frame. According to the combined type overspeed protection device for the elevator, the two sets of band-type brake plates are close to the speed reduction disc through the two sets of inverted-splayed transmission arms, the speed reduction disc is covered through the sealing gaskets on the band-type brake plates, and in cooperation with the overspeed protection device arranged on the elevator car, dual protection can be achieved when the elevator car overspeeds and falls; and the survival rate of people in the lift car is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of elevator safety equipment, in particular to a composite overspeed protection device for elevator. BACKGROUND

[0002] The elevator is a vertical lift powered by a motor, equipped with a box-shaped cabin, used for multi-storey building passengers or carrying goods. As a vertical transportation tool, the elevator has become an important building equipment and is indispensable in high-rise buildings and public places. With the increasingly widespread application of elevators, the safety of elevators has also been of great concern. The existing elevator, its speed limiter and safety pawl are separated, the speed limiter is installed in the machine room, the safety pawl is installed in the car frame, and the speed limiter tensioning device needs to be installed in the pit. The speed limiter, safety pawl and speed limiter tensioning device are connected together through the speed limiter wire rope. When the floor is too high, the speed limiter wire rope is too long and prone to slack, which also causes the extension of the emergency stop distance, and the safety is greatly compromised. The manufacturing and installation cost is high, and the maintenance is difficult.

[0003] In order to solve the above problems, through retrieval, a composite overspeed protection device for elevator convenient to maintain is disclosed in the publication number CN214114583U. In the document, it is proposed that when the pulley steel cable connected to the elevator box breaks or the motor loses speed, the second rail wheel connected with the guide rail will increase in speed, thereby increasing the centrifugal force. Under the action of the rapidly increased centrifugal force, the included angle of the force of the telescopic spring column and the second rail wheel is outward, which makes the telescopic spring column lengthen, and the brake jaw is engaged with the rail jaw, so that the rail tooth disc rotates to drive the sliding rod to slide in the sliding groove and drive the brake rod to displace to the side of the second rail wheel. Under the action of the first spring, the brake plate is attached to the outside of the second rail wheel, so that the speed is reduced. The above device can set the minimum safety area by setting the brake plate and the brake groove in cooperation with the telescopic rod, or lengthen the brake plate to extend the deceleration distance. This scheme greatly improves the safety, but in actual use, the tooth jaw is engaged with the rail jaw, and the contact area between the tooth jaw and the rail jaw is small. When the car falls rapidly, the rail wheel rotates at high speed, and under the action of the centrifugal force, the tooth jaw is difficult to be engaged with the rail jaw, and the deceleration effect cannot be achieved, which reduces the survival rate of passengers in the car. SUMMARY

[0004] The purpose of the present application is to provide a composite overspeed protection device for elevator to solve the defects mentioned in the background art.

[0005] In order to achieve the above object, a composite overspeed protection device for elevator is provided, which comprises an overspeed protection device body, a traction sheave is installed on one side of the overspeed protection device body, a main shaft is inserted into the traction sheave, a reduction disc is fixedly arranged on the outer ring surface of the main shaft, a detection disc is fixedly arranged in the traction sheave, an inspection wheel is installed on the upper side of the detection disc, a wheel speed detection device is arranged on one side of the inspection wheel, a fixing frame is fixedly arranged on one side of the wheel speed detection device, the overspeed protection device body is installed on the right side of the fixing frame, the overspeed protection device body comprises a brake band arranged on one side of the fixing frame, a mounting frame is movably installed on the bottom of the brake band through a pin shaft, and the mounting frame is installed on the fixing frame through a diagonal bracing frame.

[0006] Further, the detection disc and the inspection wheel are circular, the inspection wheel and the detection disc are rollingly connected, the axial section of the detection disc and the traction sheave is a concentric circle structure, and the rotation speed of the detection disc is detected through the inspection wheel and the wheel speed detection device.

[0007] Further, the overspeed protection device body further comprises a sealing gasket, a connecting wheel, a transmission arm, a driving seat, a driving cylinder, a fixing seat and an electric control box, the brake band is arranged in two groups and is installed on the two sides of the reduction disc, the brake band is arranged in a V shape, and the electric control box is installed on the bottom of the fixing frame.

[0008] Further, the inner wall of the two groups of brake bands is fixedly provided with the sealing gaskets, the two groups of oppositely arranged sealing gaskets are wrapped on the two sides of the reduction disc, the side wall of the two groups of brake bands is provided with accommodating holes, the connecting wheels are movably arranged in the accommodating holes through pin shafts, and the inner sides of the two groups of connecting wheels are fixedly provided with the transmission arms.

[0009] Further, the two groups of transmission arms are arranged in an inverted eight character shape, the driving seat is arranged on the bottom of the transmission arm, and the transmission arm and the driving seat are movably connected through a pin shaft.

[0010] Further, the bottom of the driving seat is fixed with the piston rod of the driving cylinder, the outer side of the driving cylinder is fixedly provided with the fixing seat, the driving cylinder is installed on the fixing frame through the fixing seat, and the piston rod of the driving cylinder drives the driving seat to ascend and descend and drives the two groups of brake bands to open and close through the transmission arm.

[0011] Compared with the prior art, the present application has the following beneficial effects: 1. The piston rod of the driving cylinder moves downward, the driving cylinder is preferably a servo electric cylinder, the driving seat moves downward at this time, and the two groups of brake bands are moved to the reduction disc through the two groups of inverted eight character shaped transmission arms, the reduction disc is covered through the sealing gaskets thereon, the brake bands clamped on the two sides of the reduction disc are used to complete the speed reduction of the traction sheave, the device can be used as an elevator overspeed protection device, and the double protection of the elevator car in the case of overspeed falling can be realized by cooperating with the overspeed protection device on the elevator car, so that the survival rate of the people in the car is improved. 2. The scheme can effectively convert the movement of the drive seat into the closing action of the brake plate through two groups of inverted eight-shaped transmission arms, reduce energy loss, make power transmission more efficient; the brake plate covers the deceleration disc through the sealing gasket, and the two sides simultaneously clamp the deceleration disc, so that the deceleration force is uniformly distributed on both sides of the traction sheave, avoiding the occurrence of unbalanced load and vibration during braking, so that the car is more stable when decelerating, and the personnel inside is not easy to fall down. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is a front view of the structure of the application; Figure 2 It is a bottom view of the structure of the application; Figure 3 It is a top view of the structure of the application; Figure 4 It is a schematic view of the structure of the overspeed protection device body; Figure 5 It is a schematic view of the structure of the brake plate, drive cylinder and its connecting structure.

[0013] Reference numerals in the drawing: 1, traction sheave; 2, detection disc; 3, inspection wheel; 4, wheel speed detection device; 5, fixed frame; 6, main shaft; 61, deceleration disc; 7, overspeed protection device body; 70, mounting bracket; 71, brake plate; 72, sealing gasket; 73, connecting wheel; 74, transmission arm; 75, drive seat; 76, drive cylinder; 77, fixed seat; 78, electric control box. DETAILED DESCRIPTION

[0014] Please refer to Figures 1-5 The application provides a composite overspeed protection device for elevator, which comprises an overspeed protection device body 7, a traction sheave 1 is installed on one side of the overspeed protection device body 7, a main shaft 6 is inserted into the traction sheave 1, a deceleration disc 61 is fixedly arranged on the outer ring surface of the main shaft 6, a detection disc 2 is fixedly arranged in the traction sheave 1, an inspection wheel 3 is installed on the upper side of the detection disc 2, a wheel speed detection device 4 is arranged on one side of the inspection wheel 3, a fixed frame 5 is fixedly arranged on one side of the wheel speed detection device 4, and the overspeed protection device body 7 is installed on the right side of the fixed frame 5.

[0015] Working principle: when the car falls rapidly, the traction sheave 1 rotates at high speed at this time, the detection disc 2 also rotates at high speed, the rotation speed information of the detection disc 2 can be detected through the inspection wheel 3 and the wheel speed detection device 4, when the rotation speed information detected by the wheel speed detection device reaches or exceeds the set threshold value, the controller sends a start signal to the driver of the servo cylinder through the corresponding output port, the driving cylinder 76 is installed on the fixed frame 5 through the fixed seat 77, the piston rod of the driving cylinder 76 drives the driving seat 75 to rise and fall and drives the two groups of brake pads 71 to open and close through the transmission arm 74, the specific way is: the piston rod of the driving cylinder 76 moves downward, the driving cylinder 76 is preferably a servo cylinder, at this time, the driving seat 75 moves downward, and through the two groups of inverted eight-shaped transmission arms 74, the two groups of brake pads 71 are close to the speed reducer disc 61, and the speed reducer disc 61 is covered through the sealing gasket 72, the brake pads 71 clamped on both sides of the speed reducer disc 61 complete the speed reduction work of the traction sheave 1; The device can be used as an elevator overspeed protection device, and can realize double protection of the elevator car when the elevator car falls at high speed, improve the survival rate of the people in the car, and the wheel speed detection device 4 is preferably an optical encoder, which can be directly purchased in the market. The servo cylinder can accurately control the downward movement displacement and speed of the driving seat 75, and then accurately adjust the closing force and clamping position of the brake pads 71 on the speed reducer disc 61, so that the speed reduction process is more stable and controllable, and the precise speed reduction effect can be realized according to the actual demand; The dynamic response performance of the servo system is excellent, the driving seat 75 can move downward rapidly and drive the transmission arm 74 to act, so that the brake pads 71 quickly close to the speed reducer disc 61, the traction sheave 1 can be speeded down in time, and the braking timeliness of the system is improved; Through the power transmission of the two groups of inverted eight-shaped transmission arms 74, the movement of the driving seat 75 can be effectively converted into the closing action of the brake pads 71, the energy loss is reduced, and the power transmission is more efficient; The brake pads 71 cover the speed reducer disc 61 through the sealing gasket 72, and clamp the speed reducer disc 61 on both sides, so that the speed reduction force is evenly distributed on both sides of the traction sheave 1, avoiding the occurrence of unbalanced load and vibration during braking, and making the traction sheave 1 speed down more smoothly; The mechanical structure of the servo cylinder is relatively simple and has few moving parts, which is not easy to malfunction, and the structure design of the transmission arm 74 and the brake pad 71 is relatively firm, which can ensure that the speed reduction work is stably completed in the long-term use process, and the reliability of the whole braking system is improved.

[0016] As a preferred embodiment, the detection disc 2 and the inspection wheel 3 are circularly arranged, the inspection wheel 3 and the detection disc 2 are rollingly connected, the axial section of the detection disc 2 and the traction sheave 1 is a concentric circle structure, and the rotation speed of the detection disc 2 is detected through the inspection wheel 3 and the wheel speed detection device 4.

[0017] As a preferred implementation, the overspeed protection device body 7 further comprises a sealing pad 72, a connecting wheel 73, a transmission arm 74, a driving seat 75, a driving cylinder 76, a fixing seat 77 and an electric control box 78. The two groups of brake board 71 are arranged on the two sides of the deceleration disc 61 respectively. The brake board 71 is arranged in a "V" shape. The electric control box 78 is installed at the bottom of the fixing frame 5.

[0018] The inner wall of the two groups of brake board 71 is fixedly provided with a sealing pad 72. The two groups of sealing pads 72 arranged oppositely wrap the two sides of the deceleration disc 61. The side wall of the two groups of brake board 71 is provided with a containing hole. The containing hole is internally movably provided with a connecting wheel 73 through a pin shaft. The inner side of the two groups of connecting wheels 73 is fixedly provided with a transmission arm 74.

[0019] The two groups of transmission arms 74 are arranged in an inverted V shape. The bottom of the transmission arm 74 is provided with a driving seat 75. The transmission arm 74 and the driving seat 75 are movably connected through a pin shaft.

[0020] As a preferred implementation, the bottom of the driving seat 75 is fixed with the piston rod of the driving cylinder 76. The outer side of the driving cylinder 76 is fixedly provided with a fixing seat 77. The driving cylinder 76 is installed on the fixing frame 5 through the fixing seat 77. The piston rod of the driving cylinder 76 drives the driving seat 75 to rise and fall and drives the two groups of brake board 71 to open and close through the transmission arm 74.

Claims

1. A composite overspeed protection device for elevators, comprising an overspeed protection device body (7), characterized in that: The overspeed protection device body (7) is equipped with a traction wheel (1) on one side. A main shaft (6) is inserted inside the traction wheel (1). A speed reduction disc (61) is fixedly installed on the outer ring surface of the main shaft (6). A detection disc (2) is fixedly installed inside the traction wheel (1). An inspection wheel (3) is installed on the upper side of the detection disc (2). A wheel speed detection device (4) is installed on one side of the inspection wheel (3). A fixed frame (5) is fixedly installed on one side of the wheel speed detection device (4). The overspeed protection device body (7) is installed on the right side of the fixed frame (5). The overspeed protection device body (7) includes a brake plate (71) installed on one side of the fixed frame (5). A mounting bracket (70) is movably installed on the bottom of the brake plate (71) through a pin. The bottom of the mounting bracket (70) is installed on the fixed frame (5) through a diagonal brace.

2. The elevator composite overspeed protection device according to claim 1, characterized in that: The detection disc (2) and the inspection wheel (3) are both circular. The inspection wheel (3) and the detection disc (2) are connected by rolling. The axial cross-section of the detection disc (2) and the traction wheel (1) is a concentric circle structure. The rotational speed of the detection disc (2) is detected by the inspection wheel (3) and the wheel speed detection device (4).

3. The elevator composite overspeed protection device according to claim 1, characterized in that: The overspeed protection device body (7) also includes a sealing gasket (72), a connecting wheel (73), a transmission arm (74), a drive seat (75), a drive cylinder (76), a fixed seat (77), and an electrical control box (78). The brake plate (71) is set in two sets and installed on both sides of the speed reducer (61). The brake plate (71) is set in a "V" shape. The electrical control box (78) is installed at the bottom of the fixed frame (5).

4. The elevator composite overspeed protection device according to claim 3, characterized in that: A sealing gasket (72) is fixedly installed on the inner wall of both sets of brake plates (71). The two sets of sealing gaskets (72) are respectively wrapped around the two sides of the speed reducer (61). A receiving hole is opened on the side wall of the two sets of brake plates (71). A connecting wheel (73) is movably installed inside the receiving hole through a pin shaft. A transmission arm (74) is fixedly installed on the inner side of both sets of connecting wheels (73).

5. The elevator composite overspeed protection device according to claim 4, characterized in that: Two sets of transmission arms (74) are arranged in an inverted V-shape. A drive seat (75) is provided at the bottom of the transmission arm (74). The transmission arm (74) and the drive seat (75) are connected by a pin.

6. The elevator composite overspeed protection device according to claim 5, characterized in that: The bottom of the drive seat (75) is fixed to the piston rod of the drive cylinder (76). A fixed seat (77) is fixedly installed on the outside of the drive cylinder (76). The drive cylinder (76) is mounted on the fixed frame (5) through the fixed seat (77). The piston rod of the drive cylinder (76) drives the drive seat (75) to rise and fall, and drives the two sets of brake plates (71) to open and close through the transmission arm (74).

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