A speed limiter and an elevator

Abstract

The present invention relates to a speed limiter and an elevator. The speed limiter includes a wheel axle and a rope wheel rotatably mounted on the wheel axle. A brake disc is coaxially provided on the wheel axle. The rope wheel is provided with a centrifugal mechanism. The centrifugal mechanism includes two centrifugal flyweights and a speed regulation assembly disposed between the two centrifugal flyweights. The two centrifugal flyweights are rotatably mounted on the rope wheel and are respectively located on both sides of the brake disc. The speed regulation assembly is used to adjust the speed limit of the speed limiter. The speed limiter further includes a link mechanism, a brake roller and a brake guide rail. The link mechanism is used for the linkage connection of the two centrifugal flyweights and the brake roller. When the speed limiter is in an overspeed state, the centrifugal flyweights drive the brake roller to be in contact with the brake disc through the link mechanism, and the brake disc drives the brake roller to move along the brake guide rail to achieve braking. The speed limiter of the present invention has the characteristics of instant triggering and quick response during overspeed detection, and can also adaptively determine the locking direction of the brake roller according to the rotation direction of the rope wheel.

Description

Technical Field

[0001] The present invention belongs to the technical field of elevator components, and particularly relates to a speed limiter and an elevator. Background Art

[0002] According to the requirements of the new elevator standard, to ensure that the speed limiter operates before reaching the dangerous speed, the maximum distance corresponding to the movement of the speed limiter rope between the action points of the speed limiter that triggers the progressive safety gear should not be greater than 250 mm. The maximum distance corresponding to the movement of the speed limiter rope between the action points of the speed limiter that triggers the instantaneous safety gear should not be greater than 100 mm. Currently, most of them achieve this by increasing the number of ratchet claws. However, during the overspeed detection process, due to the impact, overshooting or tooth skipping may occur, which affects the system response time. At the same time, using two sets of ratchet structures to achieve the detection function results in a complex overall structure and a large installation space.

[0003] Based on this, it is necessary to improve the existing speed limiter to achieve continuous instantaneous triggering. Summary of the Invention

[0004] Based on the above-mentioned drawbacks and deficiencies existing in the prior art, one of the objectives of the present invention is to at least solve one or more of the above problems existing in the prior art. In other words, one of the objectives of the present invention is to provide a speed limiter and an elevator that meet one or more of the foregoing requirements.

[0005] To achieve the above invention objective, the present invention adopts the following technical solutions:

[0006] A speed limiter includes a wheel shaft and a rope wheel rotatably mounted on the wheel shaft. A brake disc is coaxially provided on the wheel shaft. The rope wheel is provided with a centrifugal mechanism. The centrifugal mechanism includes two centrifugal sliders and a speed regulating assembly disposed between the two centrifugal sliders. The two centrifugal sliders are rotatably mounted on the rope wheel and are respectively located on both sides of the brake disc. The speed regulating assembly is used to adjust the speed limit of the speed limiter. The speed limiter further includes a link mechanism, a brake roller, and a brake guide rail. The link mechanism is used for the linkage connection of the two centrifugal sliders and the brake roller.

[0007] When the speed limiter is in an overspeed state, the centrifugal sliders drive the brake roller to fit against the brake disc through the link mechanism, and the brake disc drives the brake roller to move along the brake guide rail to achieve braking.

[0008] As a preferred solution, the link mechanism includes a first link, a second link, and a third link. One end of the first link is hinged to one centrifugal slider. The other end of the first link, one end of the second link, and one end of the third link are hinged. The other end of the second link is hinged to the other centrifugal slider. The other end of the third link is hinged to the brake roller.

[0009] As a preferred solution, the brake guide rail includes an upward overspeed brake guide rail and a downward overspeed brake guide rail;

[0010] When the speed limiter is in the overspeed upward state, the centrifugal flyweight drives the braking roller to be in contact with the brake disc through the linkage mechanism, and the brake disc drives the braking roller to move along the overspeed upward braking guide rail to achieve upward braking;

[0011] When the speed limiter is in the overspeed downward state, the centrifugal flyweight drives the braking roller to be in contact with the brake disc through the linkage mechanism, and the brake disc drives the braking roller to move along the overspeed downward braking guide rail to achieve downward braking.

[0012] As a preferred solution, the guiding surface of the overspeed upward braking guide rail is an inclined surface or an arc surface, and the guiding surface of the overspeed downward braking guide rail is an inclined surface or an arc surface.

[0013] As a preferred solution, the outer peripheral surface of the brake disc is in braking cooperation with the outer peripheral surface of the braking roller, and both the outer peripheral surface of the brake disc and the outer peripheral surface of the braking roller have knurling;

[0014] And / or, the guiding surface of the braking guide rail has knurling.

[0015] As a preferred solution, the braking guide rail forms a V-shaped structure.

[0016] As a preferred solution, the rope wheel is provided with flyweight limiters corresponding to the centrifugal flyweights one by one, for preventing the centrifugal flyweights from contacting the brake disc.

[0017] As a preferred solution, the rope wheel includes a rope wheel outer ring and a rope wheel inner ring coaxially installed. The rope wheel inner ring includes a main wheel ring and a friction force adjusting ring coaxially and fixedly installed on the main wheel ring. The outer edge of the main wheel ring and the outer edge of the friction force adjusting ring form an installation groove. The inner ring of the rope wheel outer ring is embedded in the installation groove, and both sides of the inner ring of the rope wheel outer ring are in frictional cooperation with the main wheel ring and the friction force adjusting ring through friction plates;

[0018] Wherein, a disc spring is provided in the axial fixing structure of the main wheel ring and the friction force adjusting ring.

[0019] As a preferred solution, the speed regulation assembly includes a speed regulation spring, an adjusting rod and a limit seat. One end of the speed regulation spring is connected to one of the centrifugal flyweights, the other end of the speed regulation spring is connected to one end of the adjusting rod, the adjusting rod is threadedly connected to the limit seat to adjust the elongation of the speed regulation spring, and the limit seat is hinged to the other centrifugal flyweight.

[0020] The present invention also provides an elevator, which is characterized in that it adopts the speed limiter according to any one of the above solutions.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] The speed limiter of the present invention, under the action of centrifugal force, the centrifugal flyweights are thrown out and the braking rollers are linked through a linkage mechanism to fit the brake disc. The brake disc drives the braking rollers to move along the brake guide rail and is locked between the brake disc and the rope wheel, so that the rope wheel stops rotating to achieve lifting. During overspeed detection, it has the characteristics of instant triggering and fast response, thus improving the response time of the braking of the safety protection device. Moreover, it can also adaptively determine the locking direction of the braking rollers according to the rotation direction of the rope wheel.

[0023] For the elevator of the present invention, the capture response time of the speed limiter of the present invention is short and the response is fast, improving the braking safety of the elevator against overspeed during upward and downward travel. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a front view structural schematic diagram of the two-way speed limiter according to Embodiment 1 of the present invention;

[0025] Figure 2 is a rear view structural schematic diagram of the two-way speed limiter according to Embodiment 1 of the present invention;

[0026] Figure 3 is Figure 2 the sectional view taken along line A-A in

[0027] Figure 4 is Figure 3 the enlarged view of part I in

[0028] Figure 5 is a structural schematic diagram of the axle according to Embodiment 1 of the present invention;

[0029] Figure 6 is a structural schematic diagram of the two-way speed limiter according to Embodiment 1 of the present invention (omitting the outer ring of the rope wheel);

[0030] Figure 7 is a structural schematic diagram of the brake guide rail according to Embodiment 1 of the present invention;

[0031] Figure 8 is a structural schematic diagram of the two-way speed limiter according to Embodiment 1 of the present invention in the overspeed trigger state. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0032] In order to more clearly illustrate the embodiments of the present invention, the specific embodiments of the present invention will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained according to these drawings and other embodiments can be obtained.

[0033] Embodiment 1:

[0034] As Figure 1-7As shown in the figure, the two-way speed limiter of this embodiment includes a wheel axle 1, a rope pulley 2, a brake disc 3, brake rollers 4, a brake guide rail 5, a centrifugal mechanism and a connecting rod mechanism. Among them, the rope pulley 2 is coaxially installed on the wheel axle 1 through a bearing 6 to realize the rotation of the rope pulley 2. In addition, the brake rollers 4 and the centrifugal mechanism are installed on the rope pulley 2.

[0035] Specifically, the wheel axle 1 sequentially includes a limit section 1a, a bearing installation section 1b, a shoulder section 1c, a brake disc 3 and an extended installation section 1e along its axial direction. The limit section 1a has a limit groove for installing a shaft circlip to limit the bearing 6 installed on the bearing installation section 1b. The outer diameter of the shoulder section 1c is larger than that of the bearing installation section 1b, and the shaft circlip and the shoulder section 1c respectively limit both sides of the bearing 6, so as to limit the axial movement of the rope pulley 2. The brake disc 3 protrudes beyond the rope pulley 2 for braking cooperation with the brake rollers 4, and the extended installation section is used for the installation of the wheel axle 1.

[0036] The rope pulley 2 includes a coaxially installed rope pulley outer ring 2a and a rope pulley inner ring 2b. A friction plate 7 is provided between the rope pulley outer ring 2a and the rope pulley inner ring 2b to generate a frictional torque between the rope pulley outer ring 2a and the rope pulley inner ring 2b under the action of spring force, so as to lift the steel wire rope to generate a stable lifting force.

[0037] In order to facilitate the adjustment of the lifting force of the steel wire rope, the rope pulley inner ring 2b of this embodiment includes a main wheel ring 2-1 and a friction force adjustment ring 2-2 coaxially and fixedly installed on the main wheel ring. The friction force adjustment ring 2-1 and the centrifugal mechanism are respectively located on both sides of the main wheel ring 2-1. The friction force adjustment ring 2-2 and the main wheel ring 2-1 are fixed by a combination of a bolt L and a disc spring 20 passing through the bolt to realize the adjustment of the normal pressure between the friction force adjustment ring and the main wheel ring. In addition, the outer edge of the main wheel ring 2-1 and the outer edge of the friction force adjustment ring 2-2 form an installation groove, and the inner ring 2-3 of the rope pulley outer ring is embedded in the installation groove, and both sides of the inner ring 2-3 of the rope pulley outer ring are in frictional cooperation with the main wheel ring 2-1 and the friction force adjustment ring 2-2 through the friction plate 7. There are several friction plates 7, which are evenly distributed along the circumferential direction of the installation groove.

[0038] The centrifugal mechanism of this embodiment includes a left centrifugal weight 8-1, a right centrifugal weight 8-2 and a speed regulation assembly arranged between the left centrifugal weight 8-1 and the right centrifugal weight 8-2. The left centrifugal weight 8-1 and the right centrifugal weight 8-2 are both rotatably installed on the main wheel ring 2-1 of the rope pulley. In addition, the main wheel ring 2-1 of the rope pulley is installed with a weight limiting member 21 corresponding to each centrifugal weight to prevent the centrifugal weight from contacting the brake disc; among them, the weight limiting member 21 is a bolt with a rubber pad, not limited to a specific structure, and any structural member that can achieve limiting can be used.

[0039] The speed regulation assembly of this embodiment is used to adjust the speed limit of the two-way speed limiter and reset the two-way speed limiter. Specifically, the speed regulation assembly includes a speed regulation spring 9-1, an adjusting rod 9-2, and a limit seat 9-3. The left end of the speed regulation spring 9-1 is connected to a position away from its rotation center (i.e., its top end) on the left centrifugal flyweight 8-1. The right end of the speed regulation spring 9-1 is connected to a spring mounting plate at the left end of the adjusting rod 9-2. The adjusting rod 9-2 is threadedly connected to the limit seat 9-3 to adjust the elongation of the speed regulation spring 9-1. The limit seat 9-3 is hinged to a position away from its rotation center (i.e., its top end) on the right centrifugal flyweight 8-2, thereby adjusting the speed limit of the two-way speed limiter. When the adjusting rod 9-2 moves to the target position, the adjusting rod 9-2 is still fixed to the limit seat 9-3 by threaded connection. In addition, the speed regulation assembly is not limited to the specific structure defined in this embodiment, and any existing structure that can adjust the elongation of the speed regulation spring can be used.

[0040] The link mechanism of this embodiment includes a left link 10-1, a right link 10-2, and an intermediate link 10-3. The left end of the left link 10-1 is hinged to the bottom end of the left centrifugal flyweight. The right end of the left link 10-1, the left end of the right link 10-2, and the lower end of the intermediate link 10-3 are hinged together. The right end of the right link 10-2 is hinged to the bottom end of the right centrifugal flyweight 8-2. The upper end of the intermediate link 10-3 is hinged to the brake roller 4.

[0041] The brake guide rail 5 of this embodiment is of a V-shaped structure, including a symmetrically arranged upward over-speed brake guide rail 5-1 and a downward over-speed brake guide rail 5-2. When the speed limiter is in the upward over-speed state, after the brake roller 4 fits with the brake disc 3, it moves along the upward over-speed brake guide rail 5-1 and locks to trigger the safety gear brake in the upward direction. When the speed limiter is in the downward over-speed state, after the brake roller 4 fits with the brake disc 3, it moves along the downward over-speed brake guide rail 5-2 and locks to trigger the safety gear brake in the downward direction.

[0042] Among them, the outer peripheral surface of the brake disc 3 and the outer peripheral surface of the brake roller 4 are in braking cooperation. The outer peripheral surfaces of both the brake disc 3 and the brake roller 4 have knurling to increase the friction coefficient between the brake disc 3 and the brake roller 4. In addition, the guiding surfaces of the brake guide rail 5 (including the guiding surfaces of the upward over-speed brake guide rail and the downward over-speed brake guide rail) also have knurling to increase the friction coefficient between the brake roller 4 and the brake guide rail 5.

[0043] The guiding surface of the upward over-speed brake guide rail 5-1 of this embodiment is an inclined surface, and the guiding surface of the downward over-speed brake guide rail 5-2 is an inclined surface.

[0044] In addition, the middle part of the brake guide rail 5 has an avoidance groove 50 for avoiding the movement of the hinge J where the left link 10-1, the right link 10-2, and the intermediate link 10-3 are hinged together.

[0045] When the two-way speed limiter is in the overspeed state during upward or downward movement, the two centrifugal flyweights drive the brake rollers to move to fit the brake disc through the linkage mechanism, and the brake disc drives the brake rollers to move along the brake guide rail and self-lock (as Figure 8 shown), realizing the braking of the rope wheel, thus achieving instant triggering, reducing delay and improving response, and avoiding affecting the response time of braking by triggering through the braking step.

[0046] This embodiment also provides an elevator, which adopts the two-way speed limiter of this embodiment, improving the response and safety of overspeed braking.

[0047] Embodiment 2:

[0048] The difference between the two-way speed limiter of this embodiment and that of Embodiment 1 lies in:

[0049] The guiding surfaces of the upward overspeed braking guide rail and the downward overspeed braking guide rail can also be arc surfaces, or one is an inclined surface and the other is an arc surface, as long as it can make the brake rollers move closer to and fit the brake disc;

[0050] Other structures can refer to Embodiment 1.

[0051] The elevator of this embodiment adopts the two-way speed limiter of this embodiment.

[0052] Embodiment 3:

[0053] The difference between the speed limiter of this embodiment and that of Embodiment 1 lies in:

[0054] The upward overspeed braking guide rail and the downward overspeed braking guide rail can also adopt a split design, or only one side can be set to be used as a one-way speed limiter, realizing structural diversification;

[0055] Other structures can refer to Embodiment 1.

[0056] The elevator of this embodiment adopts the two-way speed limiter or the one-way speed limiter of this embodiment.

[0057] Embodiment 4:

[0058] The difference between the speed limiter of this embodiment and that of Embodiment 1 or 3 lies in:

[0059] The rope wheel adopts a commonly used integrally formed rope wheel in the prior art;

[0060] Other structures can refer to Embodiment 1.

[0061] The elevator of this embodiment adopts the two-way speed limiter or the one-way speed limiter of this embodiment.

[0062] Embodiment 5:

[0063] The difference between the speed limiter of this embodiment and that of Embodiment 1 or 3 lies in:

[0064] The outer peripheral surface of the brake disc, the outer peripheral surface of the brake roller, and the guiding surface of the brake guide rail may also adopt wear-resistant structures of other configurations, or the knurling may be directly omitted;

[0065] Other configurations may refer to Embodiment 1.

[0066] The elevator of this embodiment adopts the bi-directional speed limiter or the uni-directional speed limiter of this embodiment.

[0067] The above description only details the preferred embodiments and principles of the present invention. For those of ordinary skill in the art, based on the idea provided by the present invention, there will be changes in the specific implementation manners, and these changes should also be regarded as the protection scope of the present invention.

Claims

1. A speed limiter, comprising a wheel axle and a rope wheel rotatably mounted on the wheel axle. A brake disc is coaxially provided on the wheel axle. The rope wheel is provided with a centrifugal mechanism. The centrifugal mechanism includes two centrifugal flyweights and a speed regulation assembly disposed between the two centrifugal flyweights. The two centrifugal flyweights are rotatably mounted on the rope wheel and are respectively located on both sides of the brake disc. The speed regulation assembly is used to adjust the speed limit of the speed limiter, and is characterized in that, The speed limiter further includes a linkage mechanism, a braking roller, and a braking guide rail. The linkage mechanism is used for the linkage connection of the two centrifugal flyweights and the braking roller; When the speed limiter is in an overspeed state, the centrifugal flyweights drive the braking roller to fit against the brake disc through the linkage mechanism, and the brake disc drives the braking roller to move along the braking guide rail to achieve braking; The linkage mechanism includes a first connecting rod, a second connecting rod, and a third connecting rod. One end of the first connecting rod is hinged to one centrifugal flyweight, and the other end of the first connecting rod, one end of the second connecting rod, and one end of the third connecting rod are hinged. The other end of the second connecting rod is hinged to the other centrifugal flyweight, and the other end of the third connecting rod is hinged to the braking roller; The braking guide rail includes an upward overspeed braking guide rail and a downward overspeed braking guide rail; When the speed limiter is in an upward overspeed state, the centrifugal flyweights drive the braking roller to fit against the brake disc through the linkage mechanism, and the brake disc drives the braking roller to move along the upward overspeed braking guide rail to achieve upward braking; When the speed limiter is in a downward overspeed state, the centrifugal flyweights drive the braking roller to fit against the brake disc through the linkage mechanism, and the brake disc drives the braking roller to move along the downward overspeed braking guide rail to achieve downward braking.

2. A speed limiter according to claim 1, characterized in that, The guiding surface of the upward overspeed braking guide rail is an inclined surface or an arc surface, and the guiding surface of the downward overspeed braking guide rail is an inclined surface or an arc surface.

3. A speed limiter according to any one of claims 1-2, characterized in that, The outer peripheral surface of the brake disc is in braking cooperation with the outer peripheral surface of the braking roller, and both the outer peripheral surface of the brake disc and the outer peripheral surface of the braking roller have rolling patterns; And / or, the guiding surface of the braking guide rail has rolling patterns.

4. A speed limiter according to any one of claims 1-2, characterized in that, The braking guide rail forms a V-shaped structure.

5. A speed limiter according to any one of claims 1-2, characterized in that, The rope wheel is provided with flyweight limiters corresponding to the centrifugal flyweights one by one, which are used to prevent the centrifugal flyweights from contacting the brake disc.

6. A speed limiter according to any one of claims 1-2, characterized in that, The rope wheel includes a rope wheel outer ring and a rope wheel inner ring coaxially installed. The rope wheel inner ring includes a main wheel ring and a friction force adjusting ring coaxially and fixedly installed on the main wheel ring. The outer edge of the main wheel ring and the outer edge of the friction force adjusting ring form an installation groove. The inner ring of the rope wheel outer ring is embedded in the installation groove, and both sides of the inner ring of the rope wheel outer ring are in frictional cooperation with the main wheel ring and the friction force adjusting ring through friction plates; Among them, a disc spring is provided in the axial fixing structure of the main wheel ring and the friction force adjusting ring.

7. A speed limiter according to any one of claims 1-2, characterized in that, The speed regulating assembly includes a speed regulating spring, an adjusting rod, and a limiting seat. One end of the speed regulating spring is connected to one of the centrifugal flyweights, and the other end of the speed regulating spring is connected to one end of the adjusting rod. The adjusting rod is threadedly connected to the limiting seat to adjust the elongation of the speed regulating spring, and the limiting seat is hinged to the other centrifugal flyweight.

8. An elevator, characterized in that, Adopt the speed limiter according to any one of claims 1-7.

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