Unintended reversal prevention device and overspeed protection device for escalator

Abstract

To provide an unintended reversal prevention device and overspeed prevention device for an escalator, which can effectively improve the safety of using the escalator.SOLUTION: One end of a core shaft 1 rotatably passes through a support frame 3, and is then coaxially connected to one end of a rotating shaft 9 of an escalator. A brake wheel 2 is coaxially fitted onto the core shaft 1, with slight notches formed around the wheel surface. The support frame 3 and a sensor 6 are each fixed to an escalator frame 4. A top wheel mechanism 5 is attached to the support frame 3 and is provided with an extendable top rod. After extending, the free end of the top rod can abut against one of the notches to limit the rotation of the brake wheel 2. The sensor 6 can monitor the rotation status of the rotating shaft 9 in real time. The top wheel mechanism 5 and sensor 6 are each controlled by a controller.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to the technical field of escalators, in particular to the technical field of anti-operation reversal and anti-overspeed devices for escalators. [Background technology]

[0002] Escalators, such as the escalator or walkway disclosed in Publication No. CN105398925B, are generally placed at an angle. Pedestrians step onto the self-propelled steps at one end of the escalator and are automatically carried to the other end, with the steps maintained horizontally along the way. Escalators are an essential staircase tool in public places and can bring convenience to people's lives.

[0003] However, with the widespread use of escalators, escalator safety accidents are becoming more frequent, resulting in casualties and negative social impacts. Because the number of passengers on an escalator is usually variable, especially when the escalator is carrying passengers downward (when gravity acts positively, the escalator often overspeeds), the escalator's unstable power supply poses a significant safety risk to passengers. Furthermore, when a phase error in the power grid, an open phase in the power grid, a power loss in the power grid, an escalator overload, a broken link in the drive chain between the drive unit and the step sprocket, or a broken link in the drive step chain occurs, the escalator may experience a non-operating reverse motion, potentially leading to a serious safety accident. Therefore, how to prevent non-operating reverse motion and overspeed while the escalator is in operation is a major issue. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] China Patent Publication CN105398925B Summary of the Invention

[0005] The present invention aims to solve the problems of the prior art and to provide an escalator anti-reverse and anti-speeding device that, when an escalator experiences an anti-reverse or excessive speed phenomenon, forcibly stops the rotation of the core shaft by extending the top rod and abutting against one of the notches on the wheel surface of the brake wheel, and transmits this stopping action to the rotating shaft connected coaxially with the core shaft, thereby effectively improving the safety of escalator use.

[0006] In order to achieve the above object, the present invention provides an escalator anti-reverse and overspeed prevention device, comprising a core shaft, a brake wheel, a support frame, a top wheel mechanism, a sensor, and a controller, one end of the core shaft rotatably passes through the support frame and is coaxially connected to one end of the rotating shaft of the escalator, the brake wheel is coaxially fitted onto the core shaft and has a number of notches around its surface, the support frame and the sensor are each fixed to the frame of the escalator, the top wheel mechanism is attached to the support frame and is provided with an extendable top rod, the free end of which can abut against one of the notches after being extended to limit the rotation of the brake wheel, the sensor can monitor the rotation status of the rotating shaft in real time, and the top wheel mechanism and the sensor are each controlled by a controller.

[0007] Preferably, the top wheel mechanism includes a base sleeve, a top rod, a spring, a permanent magnet, and an electromagnet, one end of the top rod is inserted into the sleeve passage of the base sleeve and the other end is arranged toward the wheel surface of the brake wheel, both ends of the spring are fixed to the base sleeve and the top rod, respectively, and the permanent magnet and electromagnet are attached to the top rod and the base sleeve, respectively.

[0008] Preferably, the spring has an elastic force that pushes the top rod to project from the base sleeve.

[0009] Preferably, a number of slide grooves are provided on the inner wall of the sleeve passage, and sliders slidably connected to the respective slide grooves are provided on the outer wall of the top rod.

[0010] Preferably, each of the notches is made up of an inclined surface and a vertical surface that intersect on one side, the inclination directions of the inclined surfaces are the same, and the top wheel mechanism is obliquely mounted on the support frame so that the free end of the top rod faces a step between the inclined surface and the vertical surface of one of the notches.

[0011] Preferably, the support frame includes a ferrule and a partition plate, and the ferrule and brake wheel are sequentially fitted coaxially onto the core shaft, with partition plates provided on opposite sides of the ferrule, with female threaded holes provided in each of the two partition plates, and insertion openings corresponding to the two female threaded holes provided in the outer wall of the base sleeve, and the support frame and the top wheel mechanism are fixed together by two positioning bolts (7) that are threaded into the female threaded holes and inserted into the insertion openings.

[0012] Preferably, a first flange plate and a second flange plate are provided at one end of the core shaft close to the rotation axis, and the first flange plate and the second flange plate are fixed together by a number of plate bolts arranged around the periphery, and the sensor head of the sensor faces one of the plate bolts.

[0013] Preferably, the rotating machine further includes a reversing mechanism including an assist motor and a transmission assembly, wherein the assist motor can drive the core shaft to rotate in a direction opposite to the original rotation direction via the transmission assembly, and the reversing mechanism is controlled by a controller.

[0014] Preferably, the transmission assembly includes a drive gear, a driven gear, and a toothed belt, the drive gear and the driven gear being coaxially fitted around the output shaft and the core shaft of the assist motor, respectively, and the toothed belt being simultaneously fitted around the drive gear and the driven gear.

[0015] Preferably, the reversing mechanism further includes a jack-up cylinder having a telescopic rod with a free end fixed to a toothed belt.

[0016] (Beneficial Effects of the Present Invention) 1) A core shaft with a brake wheel is coaxially attached to the rotating shaft of the escalator, and a top wheel mechanism with an extendable top rod is added to the outer periphery of the brake wheel. When the escalator experiences a non-operational reverse rotation or excessive speed, the top rod extends and abuts against one of the notches on the wheel surface of the brake wheel, forcibly stopping the rotation of the core shaft. This stopping action can be transmitted to the rotating shaft connected coaxially to the core shaft, effectively improving the safety of the escalator and preventing serious safety accidents from occurring when the escalator changes direction or the speed exceeds a predetermined value.

[0017] 2) The top wheel mechanism is composed of a base sleeve, a top rod, a spring, a permanent magnet, and an electromagnet. The spring has an elastic force that pushes the top rod out from the base sleeve, so that the retraction and extension of the top rod can be controlled by the magnetic attraction or repulsion between the permanent magnet and the electromagnet. When power is lost, the permanent magnet allows the top rod to continue to press against the brake wheel due to the spring's biasing force, thereby achieving a braking effect. This ensures that even when the power supply is interrupted, the device's braking function is still automatically activated, providing safety protection.

[0018] 3) A first flange plate and a second flange plate are added between the core shaft and the rotating shaft, and a number of plate bolts are installed around the first flange plate and the second flange plate, so that the pulse period can be monitored in real time by a sensor facing one of the plate bolts, and the controller can calculate the pulse time interval to measure the speed and direction of the escalator when it is operating and determine whether the escalator is operating normally.

[0019] 4) By attaching a reversing mechanism consisting of an assist motor, a transmission assembly, and a jack-up cylinder to the core shaft, in abnormal conditions the assist motor and transmission assembly drive the core shaft to rotate in the opposite direction to its original rotation, thereby slowing it down, thereby reducing the collision force of the brake wheel against the top wheel mechanism and extending the life of the top wheel mechanism, and in normal conditions the jack-up cylinder can loosen the toothed belt of the transmission assembly, thereby cutting off the connection between the core shaft and the assist motor.

[0020] The features and advantages of the invention will now be explained in more detail by way of example with reference to the drawings. [Brief explanation of the drawings]

[0021] [Figure 1] FIG. 1 is a front view of an escalator no-operation reversal and overspeed prevention device according to the present invention. [Figure 2] 1 is a schematic diagram of the three-dimensional structure of the field of view when the core shaft, support frame, sensor and escalator rotating shaft of the non-operational reverse and overspeed prevention device for escalator according to the present invention are assembled. [Figure 3] 1 is a schematic diagram of the three-dimensional structure of the core shaft, support frame, sensor and escalator rotating shaft of the non-operational reverse and overspeed prevention device for an escalator according to the present invention when assembled, in a different perspective. [Figure 4] FIG. 2 is a diagram showing the installation positions of the brake wheel and top wheel mechanism of the non-operational reverse and overspeed prevention device for an escalator according to the present invention. [Figure 5] FIG. 1 is a schematic diagram showing the internal structure of the top wheel mechanism of the non-operational reverse and overspeed prevention device for an escalator according to the present invention. [Explanation of symbols]

[0022] In the figure, 1 core shaft, 2 brake wheel, 21 notch, 211 inclined surface, 212 vertical surface, 3 support frame, 31 ferrule, 32 partition plate, 4 frame, 5 top wheel mechanism, 51 base sleeve, 511 slide groove, 512 insertion port, 52 top rod, 521 slider, 53 spring, 54 permanent magnet, 55 electromagnet, 6 sensor, 7 positioning bolt, 8 reversing mechanism, 81 assist motor, 82 drive gear, 83 driven gear, 84 toothed belt, 9 rotating shaft DETAILED DESCRIPTION OF THE INVENTION

[0023] 1 to 5, the non-operational reverse and overspeed prevention device for an escalator according to the present invention includes a core shaft 1, a brake wheel 2, a support frame 3, a top wheel mechanism 5, a sensor 6, and a controller. One end of the core shaft 1 rotatably passes through the support frame 3 and is coaxially connected to one end of the rotating shaft 9 of the escalator. The brake wheel 2 is coaxially fitted onto the core shaft 1 and has a small notch 21 formed around its surface. The support frame 3 and the sensor 6 are each fixed to the frame 4 of the escalator. The top wheel mechanism 5 is attached to the support frame 3 and is provided with an extendable top rod 52. The free end of the top rod 52 can abut against one of the notches 21 after being extended to limit the rotation of the brake wheel 2. The sensor 6 can monitor the rotation status of the rotating shaft 9 in real time. The top wheel mechanism 5 and the sensor 6 are each controlled by a controller.

[0024] The top wheel mechanism 5 includes a base sleeve 51, a top rod 52, a spring 53, a permanent magnet 54, and an electromagnet 55. One end of the top rod 52 is inserted into the sleeve passage of the base sleeve 51, and the other end is arranged facing the wheel surface of the brake wheel 2. Both ends of the spring 53 are fixed to the base sleeve 51 and the top rod 52, respectively. The permanent magnet 54 and the electromagnet 55 are attached to the top rod 52 and the base sleeve 51, respectively.

[0025] The spring 53 has an elastic force that pushes the top rod 52 so that it projects from the base sleeve 51 .

[0026] A number of slide grooves 511 are provided on the inner wall of the sleeve passage, and sliders 521 slidably connected to the slide grooves 511 are provided on the outer wall of the top rod 52, respectively.

[0027] Each of the notches 21 is composed of an inclined surface 211 and a vertical surface 212 that intersect on one side, and the inclination directions of the inclined surfaces 211 are the same. The top wheel mechanism 5 is obliquely mounted on the support frame 3, and the free end of the top rod 52 faces the step between the inclined surface 211 and the vertical surface 212 of one of the notches 21.

[0028] The support frame 3 includes a ferrule 31 and a partition plate 32, and the ferrule 31 and the brake wheel 2 are sequentially fitted coaxially onto the core shaft 1. A partition plate 32 is provided on each of the opposing sides of the ferrule 31, and the two partition plates 32 each have a female threaded hole. An insertion port 512 corresponding to each of the two female threaded holes is provided on the outer wall of the base sleeve 51, and the support frame 3 and the top wheel mechanism 5 are fixed together by two positioning bolts 7 which are screwed into the female threaded holes and inserted into the insertion port 512.

[0029] A first flange plate and a second flange plate are provided at one end of the core shaft 1 close to the rotating shaft 9, and the first flange plate and the second flange plate are fixed together by a number of plate bolts arranged around the periphery, with the sensor head of the sensor 6 facing one of the plate bolts.

[0030] The apparatus further includes a reversing mechanism 8 including an assist motor 81 and a transmission assembly, wherein the assist motor 81 can drive the core shaft 1 to rotate in the opposite direction to the original rotation direction via the transmission assembly, and the reversing mechanism 8 is controlled by a controller.

[0031] The transmission assembly includes a drive gear 82, a driven gear 83, and a toothed belt 84, the drive gear 82 and the driven gear 83 being coaxially fitted around the output shaft of the assist motor 81 and the core shaft 1, respectively, and the toothed belt 84 being simultaneously fitted around the drive gear 82 and the driven gear 83.

[0032] The inversion mechanism 8 further includes a jack-up cylinder having a telescopic rod with the free end fixed to a toothed belt 84 .

[0033] The working process of the present invention During escalator operation, the rotating shaft 9 is driven to rotate in the forward direction by the escalator's main motor, simultaneously rotating the core shaft 1 in the forward direction. The sensor 6 monitors the rotation status of the rotating shaft 9 and core shaft 1 in real time. Specifically, the plate bolts attached to the first and second flange plates each generate a pulse when they pass the sensor 6. Since the rotating shaft 9 should normally operate at a constant speed in the forward direction after the escalator starts, the pulse period generated by each plate bolt is also constant. If the rotating shaft 9 reverses direction or overspeeds, the pulse period will change. However, the controller can prevent the escalator from rotating backward or overspeeding without being operated by cutting off power to the control circuit or stopping the escalator operation using the top wheel mechanism 5 immediately after receiving the abnormal signal.

[0034] In the top wheel mechanism 5, when the escalator is operating normally, the electromagnet 55 is energized to attract the permanent magnet 54 by magnetic force, thereby separating the free end of the top rod 52 from the brake wheel 2, and when the escalator is operating abnormally, the electromagnet 55 is de-energized, and the spring 53 uses its urging force to push the top rod 52 outward along the sleeve path until the free end of the top rod 52 abuts against a step in one of the notches 21, stopping the rotation of the brake wheel 2, the core shaft 1 connected to the brake wheel 2, and the rotating shaft 9. Also, when the escalator is operating abnormally, the electromagnet 55 is energized to repel the permanent magnet 54 by magnetic force, thereby increasing the tension force of the top rod 52 on the brake wheel 2.

[0035] If it is necessary to stop the rotation of the rotary shaft 9, assistance can be provided by a reversing mechanism. Specifically, first, the telescopic rod is extended by the jack-up cylinder until the toothed belt 84 is in a tensioned state (the toothed belt 84 can form a transmission action between the drive gear 82 and the driven gear 83), and the assist motor 81 is started to drive the core shaft 1 to rotate in the reverse direction. Normally, the core shaft 1 can be rotated in the forward direction by the rotary shaft 9, but the jack-up cylinder contracts the telescopic rod so that the toothed belt 84 is in a slack state (the toothed belt 84 cannot form a transmission action between the drive gear 82 and the driven gear 83).

[0036] The above examples are merely illustrative of the present invention and are not intended to limit the present invention, and any simple modifications of the present invention are within the scope of the present invention.

Claims

1. The device includes a core shaft (1), a brake wheel (2), a support frame (3), a top wheel mechanism (5), a sensor (6), and a controller. One end of the core shaft (1) is rotatably passed through the support frame (3), and then coaxially connected to one end of the rotating shaft (9) of the escalator; The brake wheel (2) is fitted coaxially around the core shaft (1), and has a slight notch (21) formed around the wheel surface. The support frame (3) and the sensor (6) are fixed to the frame (4) of the escalator, The top wheel mechanism (5) is attached to the support frame (3) and is provided with an extendable top rod (52); The free end of the top rod (52) can abut against one of the notches (21) after being extended to limit the rotation of the brake wheel (2); The sensor (6) can monitor the rotation status of the rotating shaft (9) in real time, The top wheel mechanism (5) and the sensor (6) are each controlled by a controller. This device prevents escalator reversal and overspeeding.

2. The top wheel mechanism (5) includes a base sleeve (51), a top rod (52), a spring (53), a permanent magnet (54), and an electromagnet (55); One end of the top rod (52) is inserted into the sleeve passage of the base sleeve (51), and the other end is provided toward the wheel surface of the brake wheel (2). The spring (53) has both ends fixed to the base sleeve (51) and the top rod (52), respectively; The anti-operation reversal and overspeed prevention device for an escalator as claimed in claim 1, characterized in that the permanent magnet (54) and the electromagnet (55) are mounted on the top rod (52) and the base sleeve (51), respectively.

3. The spring (53) has an elastic force that pushes the top rod (52) so that it protrudes from the base sleeve (51).

3. The anti-operation reverse and overspeed prevention device for an escalator according to claim 2.

4. The inner wall of the sleeve passage is provided with a few slide grooves (511), The outer wall of the top rod (52) is provided with sliders (521) slidably connected to the slide grooves (511).

3. The anti-operation reverse and overspeed prevention device for an escalator according to claim 2.

5. Each of the notches (21) is composed of an inclined surface (211) and a vertical surface (212) that intersect on one side. The inclination directions of the inclined surfaces (211) are the same, and the top wheel mechanism (5) is obliquely provided on the support frame (3); The free end of the top rod (52) faces the step between the inclined surface (211) and the vertical surface (212) of one of the notches (21).

3. The anti-operation reverse and overspeed prevention device for an escalator according to claim 2.

6. The support frame (3) includes a ferrule (31) and a partition plate (32), The ferrule (31) and the brake wheel (2) are sequentially fitted coaxially onto the core shaft (1), and partition plates (32) are provided on both opposing sides of the ferrule (31), respectively. The two partition plates (32) are each provided with a female screw hole, and the outer wall of the base sleeve (51) is provided with insertion openings (512) corresponding to the two female screw holes, The support frame (3) and the top wheel mechanism (5) are fixed together by two positioning bolts (7) that are screwed into the female screw holes and inserted into the insertion openings (512).

3. The anti-operation reverse and overspeed prevention device for an escalator according to claim 2.

7. A first flange plate and a second flange plate are provided at one end of the core shaft (1) close to the rotation axis (9), The first flange plate and the second flange plate are fixed by a number of plate bolts provided around the periphery, The sensor head of the sensor (6) faces one of the plate bolts.

3. The anti-operation reverse and overspeed prevention device for an escalator according to claim 2.

8. a reversing mechanism (8) including an assist motor (81) and a transmission assembly; The assist motor (81) can drive the core shaft (1) to rotate in a direction opposite to the original direction of rotation through a transmission assembly; The inversion mechanism (8) is controlled by a controller.

3. The anti-operation reverse and overspeed prevention device for an escalator according to claim 2.

9. The transmission assembly includes a drive gear (82), a driven gear (83), and a toothed belt (84); The drive gear (82) and the driven gear (83) are coaxially fitted on the output shaft of the assist motor (81) and the core shaft (1), respectively. The toothed belt (84) is fitted around the driving gear (82) and the driven gear (83) at the same time.

9. The anti-operation reversal and overspeed prevention device for an escalator according to claim 8.

10. The reversing mechanism (8) further includes a jack-up cylinder with a telescopic rod whose free end is fixed to a toothed belt (84).

9. The anti-operation reversal and overspeed prevention device for an escalator according to claim 8.

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