Elevator overspeed limiting device

Abstract

The invention provides an elevator overspeed limiting device which comprises a speed governor steel wire rope hanging unit, a safety tongs module unit, a speed governor unit, a speed governor steel wire rope tensioning device and a speed governor steel wire rope, the speed governor unit is installed on a counterweight frame, and the speed governor steel wire rope hanging unit is installed at the top of an elevator shaft. The speed limiter steel wire rope tensioning device is installed in a bottom pit of an elevator shaft. One end of the speed governor steel wire rope is fixed to the speed governor steel wire rope hanging unit, the other end of the speed governor steel wire rope is fixed to the speed governor steel wire rope tensioning device, and the speed governor steel wire rope hanging unit comprises an electromagnet, a safety switch, a mounting plate and a speed governor steel wire rope end connecting device. The electromagnet and the safety switch are mounted on the mounting plate and are electrically connected with the control cabinet; when the elevator is overspeed and the steel wire rope of the speed limiter is pulled, the safety switch is triggered, so that the driving motor is closed through the control cabinet; and when the elevator needs to be restarted, the control cabinet electrifies the electromagnet, so that the safety switch is reset.

Description

Technical Field

[0001] The present invention relates to the technical field of elevators, and more particularly, to an elevator overspeed limiting device. Background Art

[0002] The elevator speed limiter is a safety component of the machine-room elevator. When there is a risk of the elevator car overspeed, the speed limiter operates to cause the elevator safety gear to operate, thereby playing a role in braking the elevator.

[0003] Currently, the elevator speed limiters are basically placed in the machine room. This layout will affect the spatial layout design of the elevator machine room, especially for twin elevators with a compact layout. Moreover, when the elevator needs to be restarted after the speed limiter operates, personnel are required to go to the machine room for manual reset of the elevator.

[0004] Therefore, the problems existing in the existing elevator speed limiters are how to set the elevator speed limiter to make its structure more compact, and further how to automatically reset it after the speed limiter operates.

[0005] The information disclosed in the background section of the present invention is only intended to enhance the overall understanding of the present invention, and should not be regarded as an admission or any form of suggestion that this information constitutes the prior art already known to those of ordinary skill in the art. Summary of the Invention

[0006] In view of the above technical problems existing in the existing elevator overspeed limiting device, the present invention provides an elevator overspeed limiting device that can be installed in the counterweight of the elevator, making the elevator layout compact without affecting the spatial layout design of the elevator machine room.

[0007] Furthermore, the elevator overspeed limiting device provided by the present invention can automatically reset itself after the speed limiter operates.

[0008] To achieve the above object, the present invention provides an elevator overspeed limiting device, including a speed limiter wire rope suspension unit, a safety gear module unit, a speed limiter unit, a speed limiter wire rope tensioning device, and a speed limiter wire rope. The speed limiter unit is installed on the counterweight frame, the speed limiter wire rope suspension unit is installed at the top of the elevator hoistway, and the speed limiter wire rope tensioning device is installed in the bottom pit of the elevator hoistway; one end of the speed limiter wire rope is fixed to the speed limiter wire rope suspension unit, and the other end is fixed to the speed limiter wire rope tensioning device after passing around the speed limiter sheave.

[0009] The speed limiter wire rope suspension unit includes an electromagnet, a safety switch, a mounting plate, and a speed limiter wire rope end connection device. The electromagnet is adjacent to the safety switch, and the electromagnet and the safety switch are installed on the mounting plate and electrically connected to the control cabinet.

[0010] When the elevator overspeed causes the governor wire rope to be pulled, the safety switch is triggered, thereby closing the drive motor through the control cabinet; when the elevator needs to restart, the control cabinet controls the electromagnet to be energized, so that the electromagnet acts on the safety switch to reset the safety switch.

[0011] Further, the governor unit and the safety clamp module unit are installed on the same counterweight frame.

[0012] Further, the governor unit includes a housing, a rope wheel, a cam block, a spring bracket, a spring, a drive disk and a shaft;

[0013] The rope wheel, the cam block, the spring bracket, the spring, the drive disk and the shaft are installed in the housing; the rope wheel is rotatably installed on the shaft;

[0014] The cam block is rotatably installed on the rope wheel, and an arc-shaped contact surface is formed on the outer surface of the cam block, and the contact surface can be engaged with the inner surface of the drive disk;

[0015] The spring bracket is installed on the rope wheel;

[0016] The spring is installed between the spring bracket and the cam block;

[0017] The drive disk is located on the outer peripheral side of the rope wheel;

[0018] When the elevator overspeed, the cam block of the governor unit increases the centrifugal force continuously with the increase of the elevator speed, so that the contact surface of the cam block is engaged with the inner surface of the drive disk, thereby driving the drive disk to rotate, and the drive disk triggers the safety clamp module unit to act.

[0019] Further, the safety clamp module unit includes a pull rod and a safety clamp, the drive disk is provided with a rotating plate, and the drive disk drives the pull rod through the rotating plate to make the safety clamp act.

[0020] Further, the rope wheel is formed with an arc-shaped adjustment groove, and the spring bracket is installed in the adjustment groove. The length of the spring can be adjusted by adjusting the position of the mounting bracket to adjust the limiting speed of the governor unit.

[0021] Further, the number of the cam blocks, the spring brackets and the adjustment grooves is two, and the cam blocks, the spring brackets and the adjustment grooves are arranged radially symmetrically on the rope wheel.

[0022] Further, the spring bracket includes an adjustment seat, an adjustment nut and an adjustment bolt, the adjustment nut is installed on the adjustment seat, one end of the adjustment bolt is connected with the spring, and the other end of the adjustment bolt is threadedly connected with the adjustment nut.

[0023] Furthermore, the governor wire rope tensioning device includes a frame and a counterweight located inside the frame.

[0024] Compared with the prior art, the present invention has the following advantages:

[0025] (1) The elevator overspeed limiting device of the present invention can be remotely reset through the control cabinet, thereby improving the maintenance efficiency.

[0026] (2) The elevator overspeed limiting device of the present invention is directly installed on the counterweight frame without occupying the machine room space, which is especially beneficial for the compact layout of the machine room structure.

[0027] (3) The governor device of the present invention has a simple structure, low cost, and convenient application.

[0028] The device of the present invention has other characteristics and advantages that will be apparent from the accompanying drawings incorporated herein and the subsequent embodiments, or will be described in detail in the accompanying drawings incorporated herein and the subsequent embodiments, which together are used to explain the specific principles of the present invention. Description of the Drawings

[0029] The exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. For clarity, the same components in different drawings are denoted by the same reference numerals. In addition, those skilled in the art in this technical field understand that the specific embodiments shown in the drawings are merely exemplary and they are not intended to limit the scope of the present invention, and the drawings of the present invention are not necessarily drawn to scale. Among them,

[0030] Figure 1 is a system schematic diagram of an embodiment of the elevator overspeed limiting device according to the present invention;

[0031] Figure 2 is a schematic diagram of a safety gear module unit and a governor unit installed on an elevator counterweight;

[0032] Figure 3 is a schematic diagram of the governor unit with the housing removed;

[0033] Figure 4 is a schematic diagram of the governor unit with the drive disk removed;

[0034] Figure 5 is a schematic diagram of a governor wire rope suspension device of an embodiment of the elevator overspeed limiting device according to the present invention.

[0035] Description of the Reference Numerals:

[0036] 1: Governor wire rope suspension unit 11: Electromagnet

[0037] 12: Safety switch 13: Mounting plate

[0038] 14: Governor wire rope end connection device

[0039] 2: Safety gear module unit 21: Mounting base

[0040] 22: Deflection sheave assembly 22a: Upper deflection sheave

[0041] 22b: Lower deflection sheave 23: Safety gear

[0042] 24: Pull rod

[0043] 3: Governor unit 31: Housing

[0044] 32: Rope sheave 33: Cam block

[0045] 34: Spring bracket 35: Spring

[0046] 36: Driving disc 37: Adjusting slot

[0047] 4: Governor wire rope tensioning device 41: Counterweight block

[0048] 42: Frame

[0049] 5: Governor wire rope

[0050] 6: Counterweight frame.

[0051] It should be understood that the drawings are not necessarily drawn to scale and present simplified representations of various features for the purpose of illustrating the basic principles of the present invention. The specific design features disclosed in the present invention (including, for example, specific dimensions, directions, positions, and shapes) will be determined in part by the specific application and use environment.

[0052] In these figures, throughout the several views of the drawings, like reference numerals represent the same or equivalent parts of the present invention. Detailed Description of the Invention

[0053] The following will refer in detail to the various embodiments of the present invention, examples of which are presented in the drawings and described below. Although the present invention will be described in conjunction with exemplary embodiments, it should be understood that this specification is not intended to limit the present invention to these exemplary embodiments. On the contrary, the present invention is intended to cover not only these exemplary embodiments, but also various alternative forms, modifications, equivalent forms, and other embodiments that may be included within the spirit of the present invention and the scope defined by the appended claims.

[0054] The elevator overspeed limiting device of the present invention is used to limit the speed of the elevator car or counterweight.

[0055] The following is a description of the elevator overspeed limiting device of the present invention in conjunction with Figures 1 - 5 the elevator overspeed limiting device of the present invention.

[0056] Refer to Figure 1 , which is a system schematic diagram of an embodiment of the elevator overspeed limiting device according to the present invention. The elevator overspeed limiting device includes a governor wire rope suspension unit 1, a safety gear module unit 2, a governor unit 3, a governor wire rope tensioning device 4, and a governor wire rope 5. The governor wire rope suspension unit 1 is installed at the top of the elevator shaft, the safety gear module unit 2 and the governor unit 3 are installed on the counterweight frame 6 of the elevator, and the governor wire rope tensioning device 4 is installed in the bottom pit of the elevator shaft.

[0057] One end of the governor wire rope 5 is fixed to the governor wire rope suspension unit 1, and the other end passes around the safety gear module unit 2 and the governor unit 3 and is fixed to the governor wire rope tensioning device 4. Specifically, the governor wire rope at the top of the shaft is fixed to the governor wire rope suspension unit 1, enters the rope wheel 32 of the governor unit 3 through the deflection rope wheel assembly 22 in the safety gear module unit 2, and finally is fixed to the governor wire rope tensioning device 4. When the running speed of the elevator exceeds the predetermined speed, the elevator overspeed limiting device stops the movement of the counterweight.

[0058] Refer to Figure 5 , which is a schematic diagram of the governor wire rope suspension device of an embodiment of the elevator overspeed limiting device according to the present invention. The governor wire rope suspension unit 1 includes an electromagnet 11, a safety switch 12, a mounting plate 13, and a governor wire rope end connection device 14.

[0059] The electromagnet 11 is installed on the mounting plate 13 and is electrically connected to a control cabinet (not shown). The electromagnet 11 can automatically reset the safety switch 12 under the remote control of the control cabinet.

[0060] The safety switch 12 is installed on the mounting plate 13 and is adjacent to the electromagnet 11, so that the electromagnet 11 can actuate the safety switch 12 to reset it. The safety switch 12 is electrically connected to the control cabinet (not shown) of the elevator. When the elevator overspeed and the governor wire rope 5 is pulled downward, the safety switch 12 is triggered, and then the safety circuit of the control cabinet is disconnected to turn off the drive motor of the elevator. When the elevator needs to be restarted, the control cabinet controls the electromagnet 11 to be energized, so that the electromagnet 11 acts on the safety switch 12 to reset the safety switch 12, and then the elevator can be restarted.

[0061] Existing safety switches need to be manually operated to reset for safety reasons. Therefore, in the speed governor wire rope suspension unit 1 of the present invention, an electromagnet 11 is provided. The electromagnet 11 is electrically connected to the control cabinet. Thus, the control cabinet can make the electromagnet 11 act on the safety switch 12 by energizing the electromagnet, so that the safety switch 12 can be automatically reset.

[0062] The mounting plate 13 is installed on the top guide rail of the elevator, thereby fixing the speed governor wire rope suspension unit 1.

[0063] The wire rope end connection device 14 of the speed governor wire rope is located at the lower part of the speed governor wire rope suspension unit 1, and the speed governor wire rope 5 is connected to the wire rope end connection device 14 of the speed governor wire rope.

[0064] Through this arrangement of the speed governor wire rope suspension unit 1, the safety switch 12 can be automatically reset, thus overcoming the inconvenience caused by manual reset.

[0065] The safety clamp module unit 2 and the speed governor unit 3 are installed on the same counterweight frame 6, see Figure 1 .

[0066] See Figure 2 , the safety clamp module unit 2 includes a mounting seat 21, a deflecting rope wheel assembly 22, a safety clamp 23 and a lifting rod 24. The safety clamp module unit 2 is installed on the counterweight frame 6 through the mounting seat 21. The lifting rod 24 is connected to the speed governor unit 3, and the speed governor unit 3 triggers the lifting rod 24 to make the safety clamp 23 act. The mounting seat 21 is fixed to the counterweight frame 6.

[0067] The deflecting rope wheel assembly 22 includes an upper deflecting rope wheel 22a and a lower deflecting rope wheel 22b. The upper deflecting rope wheel 22a and the lower deflecting rope wheel 22b are rotatably installed on the mounting seat 21. The speed governor wire rope 5 enters the upper deflecting rope wheel 22a from the upper part, and bypasses the upper deflecting rope wheel 22a to enter the rope wheel 32 of the speed governor unit 3, and then exits from the rope wheel 32 of the speed governor unit 3 and enters the lower deflecting rope wheel 22b, and finally leaves downward from the lower deflecting rope wheel 22b. The speed governor wire rope 5 is guided in a Ω shape around the upper deflecting rope wheel 22a, the rope wheel 32 of the speed governor unit 3 and the lower deflecting rope wheel 22b.

[0068] The safety clamp 23 can be stuck on the counterweight guide rail of the elevator, thereby restricting the movement of the elevator counterweight. When the speed of the elevator counterweight exceeds the speed limit, the speed governor unit 3 triggers the safety clamp 23 through the lifting rod 24, and the safety clamp 23 clamps the counterweight guide rail, so that the counterweight stops.

[0069] See Figure 3 and Figure 4 , Figure 3 is a schematic diagram of the speed governor unit, in which the housing is removed; Figure 4It is a schematic diagram of a speed limiter unit with the drive disk removed. The speed limiter unit 3 includes a housing 31, a rope pulley 32, a cam block 33, a spring bracket 34, a spring 35, a drive disk 36 and a shaft.

[0070] The housing 31 is mounted on the mounting seat 21 of the safety gear module unit 2. The rope pulley 32, the cam block 33, the spring bracket 34, the spring 35 and the drive disk 36 are all mounted inside the housing 31, and the shaft is mounted on the housing 31.

[0071] The rope pulley 32 is rotatably mounted on the shaft. The speed limiter wire rope 5 bypasses the rope pulley 32. When the counterweight of the elevator moves, the rope pulley 32 rotates, and the rotation speed of the rope pulley 32 changes with the moving speed of the elevator counterweight, that is, the faster the moving speed of the counterweight, the faster the rotation speed of the rope pulley 32, and vice versa.

[0072] An adjustment groove 37 is provided on the rope pulley 32. The adjustment groove 37 is an arc formed around the center of the rope pulley 32 and is arranged radially symmetrically relative to the center of the rope pulley 32.

[0073] The cam block 33 is rotatably mounted on the rope pulley 32 through a pin shaft. The cam block 33 is provided in two, radially symmetric relative to the center of the rope pulley 32. An arc-shaped contact surface is formed on the outer surface of the cam block 33, and this contact surface can contact the inner surface of the drive disk 36.

[0074] The spring bracket 34 is mounted on the rope pulley 32 and can be adjusted relative to the rope pulley 32. The spring bracket 34 is provided in two, radially symmetric relative to the center of the rope pulley 32. The spring bracket 34 includes two holding arms, that is, a first holding arm and a second holding arm radially opposite thereto. The spring bracket 34 is rotatably mounted on the rope pulley 32. A hole is formed at one end of the spring bracket 34, and a bolt or a pin passes through this hole and the adjustment groove 37 to connect the spring bracket 34 with the rope pulley 32. By moving the spring bracket 34 relative to the adjustment groove 37, the position of the spring bracket 34 can be adjusted, thereby adjusting the length of the spring 35, so as to achieve the function of adjusting the set speed of the speed limiter unit.

[0075] As an alternative, the structures of the adjustment groove 37 and the spring bracket 34 of the present invention can be replaced by other structures. For example, an adjustment seat and a screw can be provided on the rope pulley 32. The adjustment seat is provided with a nut, the screw is matched with the nut, and the spring is mounted on the screw. The elasticity of the spring is adjusted by adjusting the position of the screw. The adjustment seats are provided in two, radially symmetric relative to the center of the rope pulley 32.

[0076] The spring 35 is installed between the spring bracket 34 and the cam block 33. The spring 35 applies a restoring force to the cam block 33 in the counterclockwise direction. By rotating the spring bracket 34 about the rotation axis, the distance between the spring bracket 34 and the cam block 33 can be changed, and the restoring force applied by the spring 35 to the cam block 33 can be adjusted.

[0077] The drive disk 36 is formed with a receiving space in which the rope pulley 32 is received. A rotating plate is mounted on the drive disk 36. When the elevator overspeed occurs, the cam block 33 in the speed limiter unit 3 increases with the speed, and the centrifugal force continuously increases, so that it contacts the drive disk 36. The drive disk 36 drives the rotating plate to trigger the action of the lifting rod 24 of the safety gear module unit 2, thereby driving the safety gear 23 to latch onto the counterweight guide rail.

[0078] In the speed limiter unit, the steel wire rope bypasses the speed limiter wire deflection pulley 32. The speed limiter controls the operating speed of the speed limiter through the spring adjustment unit. When the speed of the counterweight exceeds the speed set by the speed limiter unit, the outer peripheral surface of the cam block 33 will contact the inner surface of the drive disk 36, thereby triggering the action of the speed limiter.

[0079] The speed limiter wire rope tensioning device 4 includes a counterweight 41 and a frame 42. The speed limiter wire rope tensioning device 4 is placed on the bottom guide rail at the bottom of the hoistway and is used to apply gravity to the speed limiter wire rope 5 so that the speed limiter wire rope 5 remains in a tensioned state.

[0080] The elevator overspeed limiting device of the present invention is applicable to various elevators, especially to twin elevators.

[0081] With the above structure, the elevator overspeed limiting device of the present invention:

[0082] - Can be remotely reset through the control cabinet, thereby improving the maintenance efficiency.

[0083] - Can be directly installed on the counterweight frame without occupying the machine room space, which is especially beneficial to the compact layout of the machine room structure.

[0084] - Has a simple structure, low cost, and convenient application.

[0085] The foregoing description of the specific exemplary embodiments of the present invention has been presented for purposes of illustration and description. The foregoing description is not intended to be exhaustive nor to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teachings. The exemplary embodiments were chosen and described in order to explain the particular principles of the invention and its practical application to enable others skilled in the art to implement and utilize the various exemplary embodiments of the invention and their various alternative forms and modifications. The scope of the invention is defined by the appended claims and their equivalents.

Claims

1. An elevator overspeed limiting device, comprising a governor wire rope suspension unit, a safety clamp module unit, a governor unit, a governor wire rope tensioning device and a governor wire rope. The governor unit is installed on the counterweight frame of the elevator, the governor wire rope suspension unit is installed at the top of the elevator shaft, and the governor wire rope tensioning device is installed in the pit of the elevator shaft; one end of the governor wire rope is fixed to the governor wire rope suspension unit, and the other end passes around the sheave of the governor unit and is fixed to the governor wire rope tensioning device, characterized in that the governor wire rope suspension unit includes an electromagnet, a safety switch, a mounting plate and a governor wire rope end connection device. The electromagnet is adjacent to the safety switch, and the electromagnet and the safety switch are installed on the mounting plate and electrically connected to the control cabinet; when the elevator overspeed causes the governor wire rope to be pulled, the safety switch is triggered, thereby closing the drive motor through the control cabinet; when the elevator needs to restart, the control cabinet controls the electromagnet to be energized, so that the electromagnet acts on the safety switch to reset the safety switch.

2. The elevator overspeed limiting device according to claim 1, characterized in that, The governor unit and the safety clamp module unit are installed on the same counterweight frame.

3. The elevator overspeed limiting device according to claim 1, characterized in that, The governor unit includes a housing, a sheave, a cam block, a spring bracket, a spring, a drive disk and a shaft; The sheave, the cam block, the spring bracket, the spring, the drive disk and the shaft are installed in the housing; The sheave is rotatably installed on the shaft; The cam block is rotatably installed on the sheave, and an arc-shaped contact surface is formed on the outer surface of the cam block, and the contact surface can be engaged with the inner surface of the drive disk; The spring bracket is installed on the sheave; The spring is installed between the spring bracket and the cam block; The drive disk is located on the outer peripheral side of the sheave; when the elevator overspeed, the centrifugal force of the cam block of the governor unit increases with the increase of the elevator speed, so that the contact surface of the cam block is engaged with the inner surface of the drive disk, thereby driving the drive disk to rotate, and the drive disk triggers the action of the safety clamp module unit.

4. The elevator overspeed limiting device according to claim 3, characterized in that, The safety clamp module unit includes a pull rod and a safety clamp. The drive disk is provided with a rotating plate, and the drive disk drives the pull rod through the rotating plate to make the safety clamp act.

5. The elevator overspeed limiting device according to claim 3, characterized in that, The sheave is formed with an arc-shaped adjustment groove, the spring bracket is installed in the adjustment groove, and the length of the spring can be adjusted by adjusting the position of the mounting bracket to adjust the limiting speed of the governor unit.

6. The elevator overspeed limiting device according to claim 5, characterized in that, The number of the cam blocks, the spring brackets and the adjustment grooves is two, and the cam blocks, the spring brackets and the adjustment grooves are arranged symmetrically in the radial direction of the sheave.

7. The elevator overspeed limiting device according to claim 3, characterized in that, The spring bracket includes an adjustment seat, an adjustment nut and an adjustment bolt. The adjustment nut is installed on the adjustment seat, one end of the adjustment bolt is connected to the spring, and the other end of the adjustment bolt is threadedly connected to the adjustment nut.

8. The elevator overspeed limiting device according to claim 1, characterized in that, The governor wire rope tensioning device includes a frame and a counterweight block located inside the frame.

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