Speed limiter and elevator

Abstract

The present invention belongs to the technical field of elevators, and particularly relates to a speed limiter and an elevator. The speed limiter includes a base frame, a rope wheel, a wheel shaft and a centrifugal mechanism. The rope wheel is mounted on the base frame through the wheel shaft, and the rope wheel is rotatably connected to the wheel shaft. The centrifugal mechanism includes a centrifugal flyweight. The speed limiter further includes a trigger plate, and the trigger plate is rotatably connected to the wheel shaft. The trigger plate has several braking steps distributed along its circumferential direction, and the braking steps are used for braking cooperation with the centrifugal flyweight when the speed limiter overspeed. The trigger plate has a limiting post, and the base frame has a travel groove. The limiting post is inserted into the travel groove to limit the rotation travel of the trigger plate. The speed limiter of the present invention adopts the structural design of the trigger plate, the limiting post and the travel groove, which can forcibly trigger and disconnect the electrical switch and achieve automatic reset after the centrifugal flyweight contacts and brakes with the braking step, and at the same time has a certain buffer, effectively solving the problem that the mechanical trigger fails to trigger the electrical part, and improving the reliability of the speed limiter.

Description

Technical Field

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

[0002] The speed limiter is one of the important components for the safe operation of elevators. The existing speed limiter uses a centrifugal flyweight and a braking step for braking cooperation. Since the braking step is in a fixed state, there is a problem that when triggered at a certain speed, the mechanical action is triggered but the electrical part is not. At the same time, when the centrifugal flyweight contacts the braking step for braking, the impact force is large, which easily causes deformation of the braking step and affects the service life of the speed limiter. Summary of the Invention

[0003] Based on the above-mentioned disadvantages and deficiencies existing in the prior art, one of the purposes 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 purposes of the present invention is to provide a speed limiter and an elevator that meet one or more of the foregoing requirements.

[0004] In order to achieve the above-mentioned invention purpose, the present invention adopts the following technical solutions:

[0005] A speed limiter includes a base frame, a rope wheel, a wheel shaft and a centrifugal mechanism. The rope wheel is installed on the base frame through the wheel shaft, and the rope wheel is rotatably connected to the wheel shaft; the centrifugal mechanism includes a centrifugal flyweight. The speed limiter further includes a trigger plate, and the trigger plate is rotatably connected to the wheel shaft;

[0006] The trigger plate has several braking steps distributed along its circumferential direction, and the braking steps are used for braking cooperation with the centrifugal flyweight when the speed limiter overspeed;

[0007] The trigger plate has a limit post, and the base frame has a travel groove; the limit post is inserted into the travel groove to limit the rotation travel of the trigger plate.

[0008] As a preferred solution, the base frame is provided with a reset mechanism for resetting the trigger plate after rotation.

[0009] As a preferred solution, the reset mechanism includes a first swing arm, a second swing arm, a screw, a reset spring and a nut. The first swing arm and the second swing arm are respectively rotatably connected to the base frame. The screw sequentially passes through the first swing arm, the second swing arm and the reset spring and is positioned by the nut; wherein, the base frame is provided with a limit convex block between the first swing arm and the second swing arm for restricting the first swing arm and the second swing arm from swinging in the same direction when the speed limiter is in the overspeed state of going up or down;

[0010] The limit post penetrates outside the travel groove to be located between the first swing arm and the second swing arm;

[0011] When the speed limiter is in the overspeed state of going up or down, the limit post drives the first swing arm or the second swing arm to swing to compress the reset spring.

[0012] Preferably, the first swing arm and the second swing arm are rotatably connected to the base frame through the same rotating shaft.

[0013] Preferably, the edge of the trigger plate is provided with an upward forced trigger and a downward forced trigger for triggering the electrical switch of the speed limiter to act.

[0014] Preferably, the centrifugal mechanism includes two centrifugal weights and a connecting rod. The two centrifugal weights are rotatably installed on the same side of the rope wheel and are respectively located on both sides of the axial direction of the wheel shaft; the two centrifugal weights are respectively rotatably connected to both ends of the connecting rod.

[0015] Preferably, one of the centrifugal weights is correspondingly provided with a speed regulation assembly for adjusting the speed limit of the speed limiter.

[0016] The present invention also provides an elevator using the speed limiter according to any one of the above solutions.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] The speed limiter of the present invention adopts the structural design of a trigger plate, a limit post and a travel groove, which can forcibly disconnect the electricity mechanically at a certain speed, and at the same time buffer after the centrifugal weight contacts and brakes the braking step, effectively avoiding the deformation of the braking step, solving the problems of impact force and maintenance triggering, and improving the reliability of the speed limiter. Description of the Drawings

[0019] Figure 1 is a front structural schematic diagram of the speed limiter according to Embodiment 1 of the present invention;

[0020] Figure 2 is a back structural schematic diagram of the speed limiter according to Embodiment 1 of the present invention;

[0021] Figure 3 is Figure 2 the sectional view taken along line A-A in;

[0022] Figure 4 is a structural schematic diagram of the centrifugal mechanism according to Embodiment 1 of the present invention;

[0023] Figure 5 is a structural schematic diagram of the trigger plate according to Embodiment 1 of the present invention;

[0024] Figure 6 is a structural schematic diagram of the speed limiter according to Embodiment 1 of the present invention from another perspective;

[0025] Figure 7 is Figure 6 the enlarged view of part I in. Detailed Embodiments

[0026] To more clearly illustrate the embodiments of the present invention, the specific implementation manners of the present invention will be described below with reference to the accompanying drawings. Obviously, the 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 based on these drawings, and other implementation manners can also be obtained.

[0027] Embodiment 1:

[0028] As Figures 1-7 shown, the speed limiter of this embodiment includes a base frame 1, a rope wheel 2, a wheel shaft 3, a centrifugal mechanism, a trigger plate 5, and an electrical switch 7.

[0029] The base frame 1 of this embodiment has an L-shaped structure, including a horizontal mounting portion 1-1 and a vertical main body portion 1-2. The mounting portion 1-1 is provided with mounting holes for installing the speed limiter; the main body portion 1-2 is used to install the main components of the speed limiter, such as the wheel shaft, the reset mechanism, etc.

[0030] The rope wheel 2 of this embodiment adopts the rope wheel structure disclosed in the patent document with the publication number CN211733507U, and the specific structure will not be elaborated here. The rope wheel 2 is installed on the main body portion of the base frame 1 through the wheel shaft 3, and the rope wheel 2 is rotatably connected to the wheel shaft 3.

[0031] The centrifugal mechanism of this embodiment is installed on the rope wheel 2 to achieve synchronous rotation. Specifically, the centrifugal mechanism includes a left centrifugal weight 4-1, a right centrifugal weight 4-2, and a connecting rod 4-3. The two centrifugal weights are rotatably installed on the same side of the rope wheel 2 and are respectively located on both sides of the axial direction of the wheel shaft 3; the tops of the two centrifugal weights are respectively rotatably connected to the two ends of the connecting rod 4-3. Among them, the right centrifugal weight 4-2 is correspondingly provided with a speed regulation assembly 4-4 for adjusting the speed limit of the speed limiter. The specific structure of the speed regulation assembly can refer to the prior art, such as the patent document with the publication number CN215479031U, which will not be elaborated here.

[0032] The trigger plate 5 of this embodiment is rotatably connected to the wheel shaft 3. The trigger plate 5 is located between the rope wheel 2 and the main body portion 1-2 of the base frame, and the trigger plate 5 has a circular structure. In addition, the trigger plate 5 has several braking steps 50 distributed along its circumferential direction. The braking steps 50 are used for braking cooperation with the above-mentioned centrifugal weights when the speed limiter is overspeed. Among them, the specific number of the braking steps can be determined according to actual application requirements, such as 3 or 4.

[0033] The trigger plate 5 of this embodiment has a limiting post 51 extending along the axial direction of the wheel shaft. Correspondingly, the main body portion 1-2 of the base frame has a travel groove 10; the limiting post 51 is inserted into and penetrates through the travel groove 10, that is, the movement stroke of the limiting post is restricted, so as to limit the rotation stroke of the trigger plate 5.

[0034] In addition, a reset mechanism for triggering the reset of the trigger plate 5 after rotation is provided on the main body portion 1-2 of the base frame. Specifically, the reset mechanism includes a first swing arm 6-1, a second swing arm 6-2, a screw 6-3, a reset spring 6-4, and a nut 6-5. The first swing arm 6-1 and the second swing arm 6-2 are respectively rotatably connected to the main body portion of the base frame. More specifically, the first swing arm 6-1 and the second swing arm 6-2 are rotatably connected to the main body portion 1-2 of the base frame through the same rotating shaft O, simplifying the overall structure. The screw 6-3 sequentially passes through the first swing arm 6-1, the second swing arm 6-2, and the reset spring 6-4 and is positioned by the nut 6-5. Among them, a limit convex block 6-6 is provided on the main body portion 1-2 of the base frame between the first swing arm 6-1 and the second swing arm 6-2, which is used to limit the first swing arm and the second swing arm from swinging in the same direction when the speed limiter is in the up or down overspeed state. Among them, the limit convex block 6-6 is fixed on the main body portion of the base frame by screws or bolts. In addition, the part of the limit post of this embodiment that penetrates outside the travel groove is located between the first swing arm 6-1 and the second swing arm 6-2. When the speed limiter is in the up or down overspeed state, the limit post drives the first swing arm or the second swing arm to swing to compress the reset spring 6-3, facilitating subsequent reset.

[0035] The edge of the trigger plate 5 of this embodiment has an upward forced trigger member 52 and a downward forced trigger member 53, which are used to forcibly trigger the operation of the electrical switch 7 of the speed limiter.

[0036] The elevator of this embodiment adopts the speed limiter of the above-mentioned embodiment of this embodiment, solving the problems of impact force and maintenance trigger.

[0037] Embodiment 2:

[0038] The difference between the speed limiter of this embodiment and that of Embodiment 1 is as follows:

[0039] The rope pulley adopts a commonly used integrally formed rope pulley structure in the prior art, meeting the requirements of different applications;

[0040] Other structures can refer to Embodiment 1;

[0041] The elevator of this embodiment adopts the speed limiter of the above-mentioned embodiment of this embodiment.

[0042] The above is only a detailed description of the preferred embodiments and principles of the present invention. For those of ordinary skill in the art, according to 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 base frame, a rope pulley, a wheel axle and a centrifugal mechanism. The rope pulley is mounted on the base frame through the wheel axle, and the rope pulley is rotatably connected to the wheel axle; the centrifugal mechanism includes a centrifugal flyweight, characterized in that, The speed limiter further includes a trigger plate which is rotatably connected to the axle; The trigger plate has several braking steps distributed along its circumferential direction, and the braking steps are used for braking cooperation with the centrifugal flyweights when the speed limiter overspeed; The trigger plate has a limit post, and the base frame has a travel groove; the limit post is inserted into the travel groove to limit the rotation travel of the trigger plate.

2. The speed limiter according to claim 1, characterized in that, The base frame is provided with a reset mechanism for resetting the trigger plate after rotation.

3. The speed limiter according to claim 2, characterized in that, The reset mechanism includes a first swing arm, a second swing arm, a screw, a reset spring and a nut. The first swing arm and the second swing arm are respectively rotatably connected to the base frame. The screw sequentially passes through the first swing arm, the second swing arm and the reset spring and is positioned by the nut; wherein, the base frame is provided with a limit projection located between the first swing arm and the second swing arm for restricting the first swing arm and the second swing arm from swinging in the same direction when the speed limiter is in the overspeed state of upward or downward movement; The limit post penetrates outside the travel groove to be located between the first swing arm and the second swing arm; When the speed limiter is in the overspeed state of upward or downward movement, the limit post drives the first swing arm or the second swing arm to swing to compress the reset spring.

4. The speed limiter according to claim 3, characterized in that, The first swing arm and the second swing arm are rotatably connected to the base frame through the same rotating shaft.

5. The speed limiter according to any one of claims 1-4, characterized in that, The edge of the trigger plate has an upward forced trigger and a downward forced trigger for triggering the operation of the electrical switch of the speed limiter.

6. The speed limiter according to any one of claims 1-4, characterized in that, The centrifugal mechanism includes two centrifugal flyweights and a connecting rod. The two centrifugal flyweights are rotatably installed on the same side of the rope wheel and are respectively located on both sides of the axial direction of the axle; the two centrifugal flyweights are respectively rotationally pair-connected to the two ends of the connecting rod.

7. The speed limiter according to claim 6, characterized in that, One of the centrifugal flyweights is correspondingly provided with a speed regulation assembly for adjusting the speed limit of the speed limiter.

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

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