A speed limiter

Abstract

The present invention relates to a speed limiter, which includes a base frame, a wheel axle on the base frame, 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 swing arms and a connecting rod arranged between the two centrifugal swing arms. A speed regulation assembly is provided between the centrifugal swing arms and the rope wheel. The two centrifugal swing arms 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. Corresponding to the two centrifugal swing arms, there are respectively provided brake bumps. The brake bumps are mounted on the rope wheel through pin shafts and are rotationally matched with the pin shafts. The centrifugal swing arms abut against the pin shafts and are linked with the brake bumps through linkage pins. When the speed limiter is in an overspeed state, the centrifugal swing arms disengage from the pin shafts and drive the brake bumps to fit against the brake disc through the linkage pins, so as to realize the braking of the rope wheel. In the overspeed state of the speed limiter of the present invention, the centrifugal swing arms directly drive the brake bumps through the linkage pins, and the brake bumps fit against the brake disc to realize the rapid response of the rope wheel braking.

Description

Technical Field

[0001] The invention belongs to the technical field of elevator accessories, and in particular relates to a speed governor. Background Art

[0002] The elevator speed limiter is one of the safety control components in the elevator safety protection system. When the elevator car is overspeeding or even in danger of falling, and all other safety protection devices do not work, the speed limiter and safety clamp will work together to stop the elevator car.

[0003] According to elevator standards, in order to ensure that the speed limiter is activated before reaching a dangerous speed, this is currently mostly achieved by increasing the number of ratchet claws. However, during the overspeed detection process, the response time is affected due to overshooting or tooth jumping caused by impact, making it impossible to respond quickly and difficult to provide a constant pulling force. Summary of the invention

[0004] Based on the above-mentioned shortcomings and deficiencies in the prior art, one of the objects of the present invention is to at least solve one or more of the above-mentioned problems in the prior art. In other words, one of the objects of the present invention is to provide a speed limiter that meets one or more of the above-mentioned requirements.

[0005] In order to achieve the above-mentioned object of the invention, the present invention adopts the following technical solutions:

[0006] A speed limiter comprises a base frame, a wheel shaft mounted on the base frame and a rope pulley rotatably mounted on the wheel shaft, the wheel shaft is coaxially provided with a brake disc, the rope pulley is provided with a centrifugal mechanism, the centrifugal mechanism comprises two centrifugal swinging arms and a connecting rod arranged between the two centrifugal swinging arms, a speed regulating assembly is arranged between the centrifugal swinging arms and the rope pulley, the two centrifugal swinging arms are rotatably mounted on the rope pulley 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, brake cams are respectively arranged corresponding to the two centrifugal swinging arms, the brake cams are respectively mounted on the rope pulley through a pin shaft and rotatably matched with the pin shaft; the centrifugal swinging arm abuts against the pin shaft and is linked with the brake cam through a linkage pin;

[0007] When the speed governor is in an overspeed state, the centrifugal swing arm is separated from the pin shaft and the brake protrusion is linked to the brake disc through the linkage pin to achieve rope wheel braking.

[0008] As a preferred solution, at least one side of the brake disc is limited on the wheel axle by a disc spring, and the disc spring is sleeved outside the wheel axle.

[0009] As a preferred solution, a friction plate is provided between the brake disc and the disc spring, and / or a friction plate is provided between the brake disc and the wheel axle; the friction plate is sleeved outside the wheel axle.

[0010] As a preferred solution, the friction plate is embedded in the brake disc, and a protective ring is provided between the brake disc and the friction plate.

[0011] Preferably, the braking bump has an arc surface for braking cooperation with the brake disc.

[0012] Preferably, the braking bump has a slot, and the linkage pin is installed on the centrifugal swing arm and inserted into the slot of the braking bump to realize the linkage of the centrifugal swing arm and the braking bump.

[0013] Preferably, it further includes a triggering mechanism for triggering the braking of the rope wheel.

[0014] Preferably, the triggering mechanism includes a first support, a second support, a rotating swing plate, a guiding shaft and a first spring. The guiding shaft is installed between the first support and the second support. One end of the rotating swing plate is rotatably installed on the guiding shaft, and the other end of the rotating swing plate is connected to the base frame through the first spring; wherein, the rotating swing plate moves axially along the guiding shaft under the action of an external force;

[0015] At least one centrifugal swing arm is provided with a triggering member;

[0016] When the rotating swing plate moves axially along the guiding shaft to the target position, the speed limiter switches to the triggering state; when the triggering member moves to contact the rotating swing plate, under the action of the rotating swing plate and the first spring, the centrifugal swing arm disengages from the pin shaft, and the braking bump is linked through the linkage pin to fit the brake disc to realize the braking of the rope wheel.

[0017] Preferably, the rotating swing plate includes a hand-pushing part and a swing plate part. The hand-pushing part is a bushing structure. One end of the guiding shaft is installed on the first support, and the other end is sleeved inside the hand-pushing part. The hand-pushing part is installed on the second support and protrudes from the second support by a preset length.

[0018] Preferably, a return spring is provided between the hand-pushing part of the rotating swing plate and the first support.

[0019] Preferably, the outer peripheral surface of the brake disc has a knurled structure.

[0020] Preferably, the centrifugal swing arm is of an L-shaped structure or a sickle-shaped structure.

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

[0022] (1) When the speed limiter of the present invention is in an overspeed state, the centrifugal swing arm directly links the braking bump through the linkage pin, and the braking bump fits the brake disc to realize the braking of the rope wheel, which can respond quickly;

[0023] (2) By utilizing the function of the disc spring, the present invention ensures that the speed limiter can be conveniently adjusted according to requirements and maintains a constant pulling force, and can also reduce the impact at the moment of braking contact;

[0024] (3) The arrangement of the friction plate of the present invention further improves the performance of the speed limiter in maintaining a constant pulling force.

[0025] (4) The arrangement of the protective ring of the present invention prevents foreign objects from entering between the friction plate and the brake disc.

[0026] (5) The triggering mechanism of the present invention can achieve low-speed triggering, which is convenient for the debugging of the speed limiter. Description of the Drawings

[0027] Figure 1 is a schematic structural diagram of the speed limiter according to Embodiment 1 of the present invention;

[0028] Figure 2 is a schematic rear view structural diagram of the speed limiter according to Embodiment 1 of the present invention;

[0029] Figure 3 is Figure 2 the sectional view taken along line A-A in

[0030] Figure 4 is a schematic structural diagram of the centrifugal mechanism according to Embodiment 1 of the present invention;

[0031] Figure 5 is a schematic structural diagram of the brake disc and the brake bump according to Embodiment 1 of the present invention;

[0032] Figure 6 is a schematic structural diagram of the linkage between the centrifugal swing arm and the brake bump according to Embodiment 1 of the present invention;

[0033] Figure 7 is a schematic structural diagram of the triggering mechanism according to Embodiment 1 of the present invention;

[0034] Figure 8 is a schematic structural diagram of the rotating swing plate and the guide shaft according to Embodiment 1 of the present invention. Detailed Embodiments

[0035] In order to more clearly illustrate the embodiments of the present invention, the following will describe the specific embodiments of the present invention 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 based on these drawings, and other embodiments can also be obtained.

[0036] Embodiment 1:

[0037] As Figures 1 to 8 shown, the speed limiter of this embodiment includes a base frame 1, a wheel shaft 2, a rope wheel 3, a brake disc 4, a centrifugal mechanism 5, a speed regulating assembly 6, a brake bump 7, and a triggering mechanism 8.

[0038] Specifically, the base frame 1 includes a base 10, a front vertical plate 11 and a rear vertical plate 12 mounted on the base 10. The front vertical plate 11 and the rear vertical plate 12 are spaced apart front and rear to form an installation space for components such as a rope pulley and a brake disc.

[0039] The wheel axle 2 is suspended and installed between the front vertical plate 11 and the rear vertical plate 12. A rope pulley 3, a brake disc 4 and a disc spring 9 are sequentially sleeved and installed on the wheel axle 2 along its axial direction. Among them, the rope pulley 3 is rotatably installed on the wheel axle 2 through a bearing, the brake disc 4 is coaxially installed on the wheel axle 2 and is located on the front side of the rope pulley 3. The outer peripheral surface of the brake disc 4 has a straight knurling structure to improve the braking stability. In addition, installation grooves 40 are respectively formed by inward concavity along the axial direction on both sides of the brake disc 4. The installation grooves 40 are used to install friction plates M. The friction plates M are sleeved outside the wheel axle. The outer periphery of the friction plates M is in contact and cooperation with a protective ring O embedded in the groove side wall of the installation groove 40 of the brake disc, which is beneficial to reducing the influence of foreign matters between the friction plates and the brake disc. Moreover, the friction plate on the rear side of the brake disc 4 abuts against the front side of the shoulder of the wheel axle 2 through a gasket, the front side of the friction plate M on the front side of the brake disc 4 abuts against the rear side of the disc spring 9, and the front side of the disc spring 9 is fastened by a combination of a nut and a gasket installed on the wheel axle 2.

[0040] The centrifugal mechanism 5 of this embodiment is installed on the front side of the rope pulley 3. The centrifugal mechanism 5 includes two centrifugal swing arms 50 and a connecting rod 51 installed between the two centrifugal swing arms. The centrifugal swing arms 50 are in a sickle shape (not limited to the sickle shape defined in this embodiment, and an L-shaped structure or other existing structures can also be adopted). The handle part of the sickle shape is rotatably connected to the rope pulley 3. The connecting rod 51 is located on the same side of the rotation fulcrum of the rope pulley 3 to realize the linkage cooperation between the two centrifugal swing arms. Among them, the two centrifugal swing arms are symmetrically distributed on both sides of the brake disc 4. A speed regulation assembly 6 is arranged between any one of the centrifugal swing arms 50 and the rope pulley 3. The speed regulation assembly 6 is used to adjust the speed limit of the speed limiter. The specific structure of the speed regulation assembly can refer to the prior art and will not be elaborated here.

[0041] Brake bumps 7 are respectively arranged corresponding to the two centrifugal swing arms in this embodiment. The brake bumps 7 are installed on the rope pulley 3 through a pin shaft I1, and the brake bumps 7 are rotatably fitted to the pin shaft I1; among them, the centrifugal swing arm 50 abuts against the pin shaft I1 and is linked with the brake bump 7 through a linkage pin I2. Specifically, the brake bump 7 has an arc surface 70 for braking cooperation with the brake disc 4. The brake bump 7 also has a slot 71. The linkage pin I2 is installed on the centrifugal swing arm 50 and inserted into the slot 71 of the brake bump 7 to realize the linkage of the centrifugal swing arm 50 with its corresponding brake bump 7.

[0042] When the speed limiter is in an overspeed state, the centrifugal swing arm 50 disengages from the pin shaft I1 and links the brake bump 7 to fit against the brake disc 4 through the linkage pin I2 to realize the braking of the rope pulley 3.

[0043] The trigger mechanism 8 of this embodiment is used to trigger the braking of the rope pulley 3. Specifically, the trigger mechanism 8 includes a front support 81, a rear support 82, a rotating swing plate 83, a guide shaft 84 and a spring 85. The guide shaft 84 is installed between the front support 81 and the rear support 82. The bottom of the rotating swing plate 83 is rotatably installed on the guide shaft 84. The top of the rotating swing plate 83 is connected to the front vertical plate 11 of the base frame through the spring 85. A limiting partition L is provided on one side of the rotating swing plate 83 facing the spring 85 for restricting the rotation of the rotating swing plate in the direction where the spring 85 is located; specifically, the rotating swing plate 83 includes an integrally formed hand-pushing part 831 and a swing plate part 832. The hand-pushing part 831 is a bushing structure. The rear end of the guide shaft 84 is sleeved and installed on the rear support 82, and the front end of the guide shaft is sleeved within the hand-pushing part 831. The hand-pushing part 831 is sleeved and installed on the front support 81 and protrudes beyond the front support 81 by a preset length, facilitating the driving of the rotating swing plate to move axially along the guide shaft by hand (i.e., the action of an external force); correspondingly, the centrifugal swing arm 50 is provided with a trigger protrusion 500 facing the rotating swing plate 83. When the rotating swing plate 83 moves axially along the guide shaft 84 to the target position, the speed limiter switches to the trigger state; at this time, when the trigger protrusion 500 moves to contact the rotating swing plate 83, under the action of the rotating swing plate 83 and the spring 85, the centrifugal swing arm 50 disengages from the pin shaft I1 and drives the braking protrusion 7 to fit against the braking disc 4 through the linkage pin I2, so as to achieve the braking of the rope pulley 3. In addition, the hand-pushing part 831 can also be driven electromagnetically, so as to drive the rotating swing plate to move axially along the guide shaft and realize the automatic switching of the speed limiter to the trigger state.

[0044] In addition, a return spring 86 is provided between the hand-pushing part of the rotating swing plate 83 and the rear support 82, facilitating the return of the rotating swing plate 83. After the return, when the rope pulley rotates, the trigger protrusion of the centrifugal swing arm avoids contacting the rotating swing plate, ensuring the normal operation of the speed limiter.

[0045] Embodiment 2:

[0046] The difference between the speed limiter of this embodiment and that of Embodiment 1 is:

[0047] Disc springs can be installed on both sides of the braking disc to meet the requirements of different applications;

[0048] Other structures can refer to Embodiment 1.

[0049] Embodiment 3:

[0050] The difference between the speed limiter of this embodiment and that of Embodiment 1 is:

[0051] The trigger mechanism can be omitted to meet the requirements of different applications;

[0052] Other structures can refer to Embodiment 1.

[0053] The above description only elaborates in detail on 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 base frame, a wheel axle installed on the base frame, and a rope wheel rotatably installed on the wheel axle. A brake disc is coaxially provided on the wheel axle, and a centrifugal mechanism is provided on the rope wheel. The centrifugal mechanism includes two centrifugal swing arms and a connecting rod provided between the two centrifugal swing arms. A speed regulation assembly is provided between the centrifugal swing arm and the rope wheel. The two centrifugal swing arms are rotatably installed 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, Brake bumps are respectively provided corresponding to the two centrifugal swing arms. The brake bumps are installed on the rope pulley through a pin shaft and are rotationally fitted to the pin shaft; the centrifugal swing arms abut against the pin shaft and are linked with the brake bumps through a linkage pin; When the speed limiter is in an overspeed state, the centrifugal swing arms disengage from the pin shaft and drive the brake bumps to fit against the brake disc through the linkage pins to achieve braking of the rope pulley; It further includes a triggering mechanism for triggering the braking of the rope pulley; The triggering mechanism includes a first support, a second support, a rotating swing plate, a guiding shaft and a first spring. The guiding shaft is installed between the first support and the second support. One end of the rotating swing plate is rotatably installed on the guiding shaft, and the other end of the rotating swing plate is connected to the base frame through the first spring; wherein, the rotating swing plate moves axially along the guiding shaft under the action of an external force; At least one centrifugal swing arm is provided with a triggering member; When the rotating swing plate moves axially along the guiding shaft to the target position, the speed limiter switches to the triggered state; when the triggering member moves to contact the rotating swing plate, under the action of the rotating swing plate and the first spring, the centrifugal swing arms disengage from the pin shaft and drive the brake bumps to fit against the brake disc through the linkage pins to achieve braking of the rope pulley.

2. A speed limiter according to claim 1, characterized in that, At least one side of the brake disc is limited on the wheel shaft through a disc spring, and the disc spring is sleeved outside the wheel shaft.

3. A speed limiter according to claim 2, characterized in that, A friction plate is provided between the brake disc and the disc spring, and / or a friction plate is provided between the brake disc and the wheel shaft; the friction plate is sleeved outside the wheel shaft.

4. A speed limiter according to claim 3, characterized in that, The friction plate is embedded in the brake disc, and a protective ring is provided between the brake disc and the friction plate.

5. A speed limiter according to any one of claims 1-4, characterized in that, The brake bump has a slot, and the linkage pin is installed on the centrifugal swing arm and inserted into the slot of the brake bump to achieve the linkage of the centrifugal swing arm and the brake bump.

6. A speed limiter according to any one of claims 1-4, characterized in that, The rotating swing plate includes a hand-pushing part and a swing plate part. The hand-pushing part is a sleeve structure. One end of the guiding shaft is installed on the first support, and the other end is sleeved inside the hand-pushing part. The hand-pushing part is installed on the second support and protrudes out of the second support by a preset length.

7. A speed limiter according to claim 6, characterized in that, A return spring is provided between the hand-pushing part of the rotating swing plate and the first support.

8. A speed limiter according to any one of claims 1-4, characterized in that, The centrifugal swing arm is of an L-shaped structure or a sickle-shaped structure.

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