Speed limiter and use thereof

Abstract

The application relates to a speed limiter and application thereof, and the speed limiter comprises a base frame, an axle, a rope wheel, a centrifugal mechanism, a brake disc, an overspeed trigger rod and a guide seat. The axle is fixedly installed on the base frame, the rope wheel is rotatably installed on the axle, the centrifugal mechanism and the guide seat are installed on the rope wheel, the brake disc is fixedly installed on the axle, the centrifugal mechanism is connected with the overspeed trigger rod in linkage, the overspeed trigger rod is guided and matched with the guide seat to be close to or far away from the brake disc, and the brake disc is circumferentially provided with a plurality of convex teeth. One end of the overspeed trigger rod adjacent to the brake disc is a brake end. When the speed limiter overspeeds, the centrifugal mechanism links the overspeed trigger rod, the overspeed trigger rod is guided and matched with the guide seat in the direction of being close to the brake disc, so that the brake end of the overspeed trigger rod is matched with the convex teeth of the brake disc. The brake end of the overspeed trigger rod matched with the circumferentially distributed convex teeth of the brake disc in linkage of the centrifugal mechanism can be adjusted in the number of the convex teeth according to the actual application demand response requirement, and different application conditions can be realized.

Description

Technical Field

[0001] This invention belongs to the field of elevator component technology, specifically relating to a speed limiter and its application. Background Technology

[0002] The speed governor is a crucial safety component of an elevator. It detects speed and triggers safety devices; its speed and reliability are essential for the effective operation of safety protection devices. It serves as the detection and triggering device for elevator overspeed or fall protection. However, current speed governors exhibit a lag in their linkage with safety mechanisms, affecting the safety of fall protection. The new GB / T7588 standard clearly specifies the maximum response delay of the speed governor, especially when using instantaneous safety clamps, where the maximum delay must be less than 100mm. Therefore, there is an urgent need to improve the performance and structure of the speed governor. Furthermore, current speed governors cannot achieve bidirectional preset lifting force. When used with bidirectional safety braking devices, two speed governors or combinations are required to achieve the function, resulting in complex structures and relatively high costs. Summary of the Invention

[0003] Based on the aforementioned shortcomings and deficiencies in the existing technology, the purpose of this invention is to provide a speed limiter and its application.

[0004] To achieve the above-mentioned objectives, the present invention adopts the following technical solution:

[0005] A speed limiter includes a base frame, a wheel axle, and a rope wheel. The wheel axle is fixedly installed on the base frame, and the rope wheel is rotatably installed on the wheel axle. It also includes a centrifugal mechanism, a brake disc, an overspeed trigger rod, and a guide seat. The centrifugal mechanism and the guide seat are installed on the rope wheel, the brake disc is fitted on the wheel axle, the centrifugal mechanism is linked to the overspeed trigger rod, and the overspeed trigger rod is guided to the guide seat to move closer to or further away from the brake disc.

[0006] The brake disc has several protruding teeth distributed around its circumference, and the overspeed trigger lever is located at the brake end adjacent to the brake disc.

[0007] When the speed limiter exceeds the speed limit, the centrifugal mechanism activates the overspeed trigger rod, which is guided towards the brake disc and engages with the guide seat so that the braking end of the overspeed trigger rod engages with the teeth of the brake disc for braking.

[0008] As a preferred embodiment, the centrifugal mechanism includes a first connecting arm, a second connecting arm, a third connecting arm, a fourth connecting arm, a first counterweight, and a second counterweight. The first, second, third, and fourth connecting arms are connected end-to-end by a revolute joint to form a parallelogram linkage mechanism. The common axis of the first and second connecting arms connected by the revolute joint is fixedly mounted on the rope pulley. The common axis of the second and third connecting arms connected by the revolute joint is provided with the first counterweight. The common axis of the third and fourth connecting arms connected by the revolute joint is linked to an overspeed trigger rod to drive the overspeed trigger rod to guide and engage with the guide seat. The common axis of the fourth and first connecting arms connected by the revolute joint is provided with the second counterweight.

[0009] As a preferred embodiment, the common shaft of the third and fourth connecting arms of the rotary joint passes through the overspeed trigger rod.

[0010] As a preferred embodiment, a speed regulating component is installed between the first connecting arm and the second connecting arm to adjust the speed limit of the speed limiter.

[0011] As a preferred embodiment, the speed regulating component includes a screw, a compression spring, and a nut; the first connecting arm has a first mounting seat, the second connecting arm has a second mounting seat, the compression spring is sleeved outside the screw, the threads of the screw pass through the second mounting seat and the first mounting seat in sequence and are fixed to the first mounting seat by the nut, and the two ends of the compression spring abut against the second mounting seat and the head of the screw, respectively; the speed limit is adjusted by adjusting the compression amount of the compression spring.

[0012] As a preferred embodiment, the first connecting arm has a first triggered portion extending radially toward the wheel axle at one end adjacent to the second counterweight, and the third connecting arm has a second triggered portion extending radially toward the wheel axle at one end adjacent to the first counterweight; the first triggered portion and the second triggered portion are mirror images of each other; the first triggered portion has a track extending along the circumferential direction of the wheel axle, and the track is an inclined surface or an arc surface.

[0013] The base frame is equipped with a manual trigger. When the manual trigger is pressed down to contact the track, the inclined or arc-shaped track that rotates together with the rope wheel interacts with the manual trigger to drive the centrifugal mechanism and trigger the overspeed trigger rod.

[0014] As a preferred embodiment, the manual trigger includes a pressing pin, a return spring, and a trigger pin. The return spring is sleeved on the head of the pressing pin and the protrusion of the base frame. The trigger pin is fixedly installed on the head of the pressing pin and extends above the track so that the trigger pin contacts the track after the pressing pin is pressed down.

[0015] As a preferred embodiment, the overspeed trigger lever has a limiting step to limit the travel of the overspeed trigger lever away from the brake disc.

[0016] As a preferred embodiment, friction pads are provided on both sides of the brake disc, and gaskets are provided on the outer side of the friction pads; the outer side of the gaskets is fixed to the wheel axle by locking members, or one side of the gasket is limited by the step of the wheel axle, and the other side of the gasket is fixed to the wheel axle by locking members.

[0017] The locking component is threaded to the wheel axle, and a disc spring is provided between the washer and the locking component or between the washer and the step of the wheel axle.

[0018] The present invention also provides an elevator that employs a speed limiter as described in any of the preceding embodiments.

[0019] Compared with the prior art, the beneficial effects of this invention are:

[0020] (1) The centrifugal mechanism of the present invention has a fast response. In addition, the braking end of the overspeed trigger rod is matched with the circumferentially distributed convex teeth of the brake disc. The number of convex teeth can be adjusted according to actual application requirements to improve the response time.

[0021] (2) The speed regulating component of the present invention adopts a compression spring structure design. By amplifying the ratio of centrifugal force to spring force, the spring can obtain greater stiffness to achieve low-speed detection, resulting in more stable performance.

[0022] (3) The brake disc of the present invention provides the lifting force of the wire rope through the friction of the friction pad, resulting in better lifting stability;

[0023] (4) This invention enables manual or remote triggering, making it more flexible and convenient to use. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the speed limiter according to Embodiment 1 of the present invention;

[0025] Figure 2 This is a structural schematic diagram of the speed limiter of Embodiment 1 of the present invention from another perspective;

[0026] Figure 3 yes Figure 2 Sectional view of section AA in the middle;

[0027] Figure 4 yes Figure 3 Enlarged view of part P in the image;

[0028] Figure 5 This is a schematic diagram of the base frame structure of Embodiment 1 of the present invention;

[0029] Figure 6 This is a schematic diagram of the wheel axle structure of Embodiment 1 of the present invention;

[0030] Figure 7 This is a schematic diagram of the rope wheel and centrifugal mechanism of Embodiment 1 of the present invention;

[0031] Figure 8 yes Figure 7 Sectional view of section BB in the middle;

[0032] Figure 9 This is a schematic diagram of the centrifuge mechanism according to Embodiment 1 of the present invention;

[0033] Figure 10 This is a schematic diagram of the overspeed trigger rod of Embodiment 1 of the present invention;

[0034] Figure 11 This is a schematic diagram of the manual triggering element in Embodiment 1 of the present invention. Detailed Implementation

[0035] To more clearly illustrate the embodiments of the present invention, specific implementation methods will be described below with reference to the accompanying drawings. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without any creative effort.

[0036] Example 1:

[0037] like Figures 1 to 11 As shown, the speed limiter in this embodiment includes a base 0, a base frame 1, a wheel axle 2, a rope wheel 3, a centrifugal mechanism 4, a brake disc 5, an overspeed trigger rod 6, a guide seat 7, a speed regulating component 8, a friction plate 9, a shim 10, a disc spring 11, a small round nut 12, a manual trigger component 13, and a manual reset switch 14.

[0038] Specifically, the base frame 1 includes a base plate 1-1 and a front upright plate 1-2 and a rear upright plate 1-3 extending upward along its long side. The space between the front upright plate 1-2 and the rear upright plate 1-3 serves as the installation space for the aforementioned components.

[0039] In this embodiment, the wheel axle 2 is fixedly mounted on the base frame 1, meaning it is stationary relative to the base frame 1. Specifically, the wheel axle 2 includes, along its axial direction, a rear anti-rotation mounting section 2-1, a rope sheave mounting section 2-2, a brake disc mounting section 2-3, a threaded section 2-4, and a front anti-rotation mounting section 2-5. The outer diameter of the rope sheave mounting section 2-2 is larger than the outer diameter of the brake disc mounting section 2-3 to form a step L, which facilitates the subsequent installation of the brake disc.

[0040] The rear anti-rotation mounting section 2-1 and the front anti-rotation mounting section 2-5 have anti-rotation planes I on both sides. Correspondingly, the top of the rear upright plate 1-3 and the front upright plate 1-2 are respectively provided with U-shaped grooves II. When the two ends of the wheel axle 2 are embedded in the U-shaped grooves II of the front and rear upright plates, the anti-rotation planes I and the side wall planes of the U-shaped grooves II fit together to prevent the wheel axle 2 from rotating. The groove opening of the U-shaped grooves II is equipped with an anti-rotation plate III, and the contact position between the anti-rotation plate III and the wheel axle 2 is adapted to the curvature of the wheel axle 2.

[0041] In this embodiment, the rope wheel 3 is rotatably mounted on the rope wheel mounting section 2-2 of the wheel axle via the bearing K. The two sides of the bearing K are fixed by the spacer K1 and the embedded elastic retaining ring K2, respectively.

[0042] The centrifugal mechanism of this embodiment includes a first connecting arm 4-1, a second connecting arm 4-2, a third connecting arm 4-3, a fourth connecting arm 4-4, a first counterweight 4-5, and a second counterweight 4-6. The first connecting arm 4-1, the second connecting arm 4-2, the third connecting arm 4-3, and the fourth connecting arm 4-4 are connected end to end by a revolute joint, forming a parallelogram linkage mechanism. The common shaft G of the first connecting arm 4-1 and the second connecting arm 4-2 connected by the revolute joint is fixedly mounted on the pulley 3. The common shaft of the second connecting arm 4-2 and the third connecting arm 4-3 connected by the revolute joint is provided with the first counterweight 4-5. The common shaft of the third connecting arm 4-3 and the fourth connecting arm 4-4 connected by the revolute joint passes through the overspeed trigger rod 6 to achieve a linkage connection, thereby driving the overspeed trigger rod 6 to guide and engage with the guide seat 7. In this embodiment, the guide seat 7 is fixedly mounted on the pulley 3. The common shaft of the fourth connecting arm 4-4 and the first connecting arm 4-1 connected by the revolute joint is provided with the second counterweight 4-6. Among them, the first counterweight 4-5 and the second counterweight 4-6 are both divided into two parts, which are linked and cooperate with the corresponding connecting arms respectively.

[0043] In this embodiment, a speed regulating component 8 is installed between the first connecting arm 4-1 and the second connecting arm 4-2 to adjust the speed limit of the speed limiter. Specifically, the speed regulating component 8 includes a screw 8-1, a compression spring 8-2, and a nut 8-3. The first connecting arm 4-1 has a first mounting base 410, and the second connecting arm 4-2 has a second mounting base 420. The compression spring 8-2 is sleeved outside the screw 8-1. The teeth of the screw 8-1 pass through the second mounting base 420 and the first mounting base 410 in sequence and are fixed to the first mounting base 410 by the nut 8-3. The two ends of the compression spring 8-2 abut against the second mounting base 420 and the head of the screw 8-1, respectively. With this design, the speed limit of the speed limiter can be adjusted by adjusting the compression amount of the compression spring 8-2 to meet the needs of different application scenarios.

[0044] In this embodiment, the brake disc 5 is fixedly installed on the brake disc mounting section 2-3 of the wheel axle. Specifically, friction pads 9 are installed on both sides of the brake disc 5, and a shim 10 is installed on the outer side of the friction pads 9. The inner shim is abutted and limited by the step L of the wheel axle, and the outer shim 10 is fixed to the threaded section 2-4 of the wheel axle by a small round nut 12. A disc spring 11 is installed between the outer shims 10 and the small round nuts 12 to facilitate the adjustment of the friction between the friction pads and the brake disc, thereby adjusting the lifting force of the wire rope H.

[0045] The aforementioned gasket 10 is a square hole gasket that mates with the planes on both sides of the brake disc mounting section 2-3 to prevent rotation.

[0046] In addition, the brake disc 5 has several protruding teeth 50 distributed around its circumference. The overspeed trigger rod 6 is located adjacent to one end of the brake disc 5, i.e., the inner end, which is the braking end 60 and has a protruding tooth structure. When the speed limiter exceeds the speed limit, the centrifugal mechanism activates the overspeed trigger rod 6. The overspeed trigger rod 6 is guided and engaged with the guide seat 7 in a direction close to the brake disc 5, so that the protruding teeth of the braking end of the overspeed trigger rod interlock with the protruding teeth of the brake disc to achieve braking engagement. After braking is completed, the brake is reset by the manual reset switch 14, i.e., the braking end of the overspeed trigger rod is driven away from the brake disc, thereby achieving brake reset. The above-mentioned manual reset switch can refer to the prior art and will not be described in detail here.

[0047] The overspeed trigger lever 6 has a limiting step 61, which is used to limit the travel of the overspeed trigger lever away from the brake disc and prevent the overspeed trigger lever 6 from disengaging from the guide seat 7.

[0048] The speed limiter in this embodiment is applied to a machine room speed limiter and also requires a manual triggering function. Specifically, the first connecting arm 4-1 has a first triggered part 41 extending radially toward the wheel axle 2 from one end adjacent to the second counterweight 4-6, and the third connecting arm 4-3 has a second triggered part 43 extending radially toward the wheel axle 2 from one end adjacent to the first counterweight 4-5; the first triggered part 41 and the second triggered part 43 are mirror images of each other; the second triggered part 43 has a track 431 extending along the circumferential direction of the wheel axle, and the track 431 is an arc surface;

[0049] Correspondingly, the front upright plate 1-2 of the base frame is equipped with a manual trigger 13. When the manual trigger 13 is pressed down to contact the track 431, the arc track 431, which rotates together with the rope wheel, interacts with the manual trigger 13, thereby driving the centrifugal mechanism and linking the overspeed trigger rod to achieve manual trigger braking.

[0050] Specifically, the manual trigger 13 includes a pressing pin 130, a return spring 131, and a trigger pin 132. The return spring 131 is sleeved on the head of the pressing pin 130 and the horizontal protrusion 120 extending outward from the front upright plate 1-2. The trigger pin 132 is fixedly installed on the head of the pressing pin 130 and extends above the track 411 so that the trigger pin 132 contacts the track 431 after the pressing pin 130 is pressed down, thereby realizing manual triggering.

[0051] This embodiment also provides an elevator that uses the aforementioned speed limiter to effectively improve safety and stability.

[0052] Example 2:

[0053] The speed limiter in this embodiment differs from that in Embodiment 1 in that:

[0054] The manual trigger and related components of the manual trigger and manual reset electrical switch are omitted, or the components are made of electromagnets to achieve remote triggering braking and remote reset, so as to meet the needs of different application scenarios.

[0055] Other structures can be found in Example 1.

[0056] The elevator in this embodiment uses the speed limiter of this embodiment to meet the needs of different application scenarios.

[0057] Example 3:

[0058] The speed limiter in this embodiment differs from that in Embodiment 1 in that:

[0059] The brake disc can adopt a one-way structure with a matching overspeed trigger rod to realize the function of a one-way speed limiter, so as to meet different application scenarios;

[0060] Other structures can be found in Example 1.

[0061] The elevator in this embodiment uses the speed limiter of this embodiment to meet the needs of different application scenarios.

[0062] Example 4:

[0063] The speed limiter in this embodiment differs from that in Embodiment 1 in that:

[0064] The overspeed trigger lever can also adopt an eccentric cam structure to achieve an overspeed self-locking function, which also serves as a speed limiter; alternatively, a centrifugal block can be used to trigger an electrical switch based on the aforementioned centrifugal mechanism.

[0065] Other structures can be found in Example 1.

[0066] The elevator in this embodiment uses the speed limiter of this embodiment to meet the needs of different application scenarios.

[0067] Example 5:

[0068] The speed limiter in this embodiment differs from that in Embodiment 1 in that:

[0069] The speed control mechanism can also use tension springs to achieve different applications, and the electrical switch can be triggered by a pin or centrifugal block to achieve electrical action;

[0070] Other structures can be found in Example 1.

[0071] The elevator in this embodiment uses the speed limiter of this embodiment to meet the needs of different application scenarios.

[0072] Example 6:

[0073] The speed limiter in this embodiment differs from that in Embodiment 1 in that:

[0074] There is no need to design steps on the axle. The outer sides of the two side washers are fixed to the axle by small round nuts, which can meet the needs of different application scenarios.

[0075] Other structures can be found in Example 1.

[0076] The elevator in this embodiment uses the speed limiter of this embodiment to meet the needs of different application scenarios.

[0077] It should be noted that the above embodiments can be freely combined as needed. The above description is only a detailed explanation of the preferred embodiments and principles of the present invention. For those skilled in the art, there will be changes in the specific implementation methods based on the ideas provided by the present invention, and these changes should also be considered within the scope of protection of the present invention.

Claims

1. A speed limiter, comprising a base frame, an axle, and a pulley, wherein the axle is fixedly mounted on the base frame, and the pulley is rotatably mounted on the axle, characterized in that, It also includes a centrifugal mechanism, a brake disc, an overspeed trigger rod, and a guide seat. The centrifugal mechanism and the guide seat are mounted on the rope wheel, the brake disc is mounted on the wheel axle, the centrifugal mechanism is linked to the overspeed trigger rod, and the overspeed trigger rod is guided to the guide seat to move closer to or away from the brake disc. The brake disc has several protruding teeth distributed around its circumference, and the overspeed trigger lever is located at the brake end adjacent to the brake disc. When the speed limiter exceeds the speed limit, the centrifugal mechanism is activated by the overspeed trigger rod. The overspeed trigger rod is guided and engaged with the guide seat in the direction closer to the brake disc, so that the braking end of the overspeed trigger rod engages with the teeth of the brake disc for braking. The centrifugal mechanism includes a first connecting arm, a second connecting arm, a third connecting arm, a fourth connecting arm, a first counterweight, and a second counterweight. The first, second, third, and fourth connecting arms are connected end-to-end by a revolute joint to form a parallelogram linkage mechanism. The common axis of the first and second connecting arms connected by the revolute joint is fixedly installed on the rope pulley. The common axis of the second and third connecting arms connected by the revolute joint is provided with the first counterweight. The common axis of the third and fourth connecting arms connected by the revolute joint is linked to an overspeed trigger rod to drive the overspeed trigger rod to guide and engage with the guide seat. The common axis of the fourth and first connecting arms connected by the revolute joint is provided with the second counterweight.

2. The speed limiter according to claim 1, characterized in that, The common shaft of the third and fourth connecting arms of the rotating joint passes through the overspeed trigger rod.

3. The speed limiter according to claim 1, characterized in that, A speed regulating component is installed between the first connecting arm and the second connecting arm to adjust the speed limit of the speed limiter.

4. The speed limiter according to claim 3, characterized in that, The speed regulating component includes a screw, a compression spring, and a nut; the first connecting arm has a first mounting seat, the second connecting arm has a second mounting seat, the compression spring is sleeved outside the screw, the screw teeth pass through the second mounting seat and the first mounting seat in sequence and are fixed to the first mounting seat by the nut, and the two ends of the compression spring abut against the second mounting seat and the head of the screw respectively; the speed limit is adjusted by adjusting the compression amount of the compression spring.

5. The speed limiter according to claim 1, characterized in that, The first connecting arm has a first triggered part extending radially toward the wheel axle at one end adjacent to the second counterweight, and the third connecting arm has a second triggered part extending radially toward the wheel axle at one end adjacent to the first counterweight; the first triggered part and the second triggered part are mirror images of each other; the second triggered part has a track extending along the circumferential direction of the wheel axle, and the track is an inclined surface or an arc surface. The base frame is equipped with a manual trigger. When the manual trigger is pressed down to contact the track, the inclined or arc-shaped track that rotates together with the rope wheel interacts with the manual trigger to drive the centrifugal mechanism and trigger the overspeed trigger rod.

6. The speed limiter according to claim 5, characterized in that, The manual trigger includes a pressing pin, a return spring, and a trigger pin. The return spring is sleeved on the head of the pressing pin and the protrusion of the base frame. The trigger pin is fixedly installed on the head of the pressing pin and extends above the track so that the trigger pin contacts the track after the pressing pin is pressed down.

7. The speed limiter according to any one of claims 1-6, characterized in that, The overspeed trigger lever has a limiting step, which is used to limit the travel of the overspeed trigger lever away from the brake disc.

8. The speed limiter according to any one of claims 1-6, characterized in that, The brake disc is provided with friction pads on both sides, and a gasket is provided on the outer side of the friction pad; the outer side of the gasket is fixed to the wheel axle by locking members, or the gasket on one side is limited by the step of the wheel axle, and the gasket on the other side is fixed to the wheel axle by locking members. The locking component is threaded to the wheel axle, and a disc spring is provided between the washer and the locking component or between the washer and the step of the wheel axle.

9. An elevator, characterized in that, The speed limiter described in any one of claims 1-8 is used.

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