Speed limiter and elevator

Abstract

The application relates to a speed limiter and an elevator, which comprises a fixed frame, a rope wheel rotatably arranged on the fixed frame, the rope wheel being used for hanging a steel wire rope, a limiting wheel arranged on the fixed frame, and a speed limiting mechanism, the speed limiting mechanism comprising a transmission block, a speed limiting wheel and a first elastic member, the transmission block being fixedly connected with the rope wheel, one end of the transmission block being hingedly connected with the speed limiting wheel, the other end of the transmission block being connected with the speed limiting wheel through the first elastic member, the speed limiting wheel being capable of being deflected relative to the transmission block based on the rotating speed of the rope wheel, so that the speed limiting wheel is selectively separated from or connected with the limiting wheel. The speed limiter and the elevator provided by the application have the advantages of simple structure.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of brake parts, in particular to a speed limiter and an elevator. BACKGROUND

[0002] When the elevator is in operation, the car is overspeed due to any reason, even the danger of falling, and all other safety protection devices do not work, then the speed limiter acts to stop the elevator car.

[0003] There is a kind of elevator speed limiter, which comprises a rack, a speed limiter rope wheel, a trigger, a ratchet, a pawl, a centrifugal hammer and a rope pressing device, the speed limiter rope wheel is arranged on the rotating shaft of the rack, the ratchet is coaxial with the speed limiter rope wheel and arranged on the rotating shaft, the centrifugal hammer is arranged on the speed limiter rope wheel, the middle part of the rope pressing device is connected to the ratchet, the middle part of the pawl is rotatably connected to the speed limiter rope wheel, one end of the pawl is connected to the centrifugal hammer and provided with a tension spring, and the other end of the pawl is connected to the ratchet.

[0004] But this kind of speed limiter uses centrifugal hammer to trigger the action of the speed limiter, uses more parts, has a complex structure, high overall cost, and large size, occupies a large space of the shaft section when arranged in the elevator, and limits the reduction of the elevator shaft space. SUMMARY

[0005] Therefore, it is necessary to provide a speed limiter and an elevator aiming at the problem of complex structure.

[0006] The first aspect of the present application provides a speed limiter, comprising: a fixed frame; a rope wheel rotatably arranged on the fixed frame; the rope wheel is used for hanging a steel wire rope; a limiting wheel arranged on the fixed frame; and a speed limiting mechanism, the speed limiting mechanism comprising a transmission block, a speed limiting wheel and a first elastic member; the transmission block is fixedly connected with the rope wheel; one end of the transmission block is hinged with the speed limiting wheel, and the other end of the transmission block is connected with the speed limiting wheel through the first elastic member; the speed limiting wheel can produce deflection relative to the transmission block based on the rotating speed of the rope wheel; so that the speed limiting wheel is selectively separated from or connected with the limiting wheel.

[0007] In one embodiment, the transmission block comprises a block body and a protruding block protruding from the block body; the speed limiting wheel is formed with a deflection groove; the lower part of the block body away from the protruding block is rotatably connected with the speed limiting wheel, the protruding block is at least partially located in the deflection groove, and the first elastic member connects the speed limiting wheel and the protruding block.

[0008] In one embodiment, the speed limiting mechanism comprises a pin shaft; the transmission block is formed with a first pin hole; the speed limiting wheel is formed with a second pin hole, and the pin shaft passes through the first pin hole and the second pin hole.

[0009] In one of the embodiments, the rope wheel comprises a main shaft, a wheel body with a shaft tube, and a transmission connecting part on the shaft tube, the main shaft is arranged in the shaft tube; the transmission block comprises a mounting hole and a limiting slot, the main shaft is arranged in the mounting hole, and the limiting slot is in limiting cooperation with the transmission connecting part.

[0010] In one of the embodiments, the outer peripheral wall of the speed limiting wheel is formed with a tooth part; the limiting wheel is a circular ring structure, and the speed limiting wheel is arranged in the limiting wheel; the inner peripheral wall of the limiting wheel is formed with at least one ratchet cooperating with the tooth part.

[0011] In one of the embodiments, a first connecting line is formed between the tooth part and the hinge point of the transmission block and the speed limiting wheel, and a second connecting line is formed between the hinge point of the transmission block and the speed limiting wheel and the rotation axis of the rope wheel; a deflection included angle is formed between the first connecting line and the second connecting line; the greater the rotation speed of the rope wheel is, the greater the deflection included angle is, and the longer the distance from the tooth part to the rotation axis of the rope wheel is.

[0012] In one of the embodiments, the speed limiting mechanism comprises a counterweight, and the speed limiting wheel is formed with an adjusting slot; the counterweight is detachably arranged on the adjusting slot.

[0013] In one of the embodiments, the speed limiter comprises a second elastic member; the limiting wheel has a first position and a second position relative to the fixed frame; the second elastic member is used to promote the limiting wheel to remain in the first position; when the speed limiting wheel is connected with the limiting wheel, the speed limiting wheel can drive the limiting wheel to switch from the first position to the second position; when the limiting wheel is in the second position, the rope wheel can be stopped by the speed limiting mechanism and the limiting wheel.

[0014] In one of the embodiments, during the switching of the first position and the second position, the limiting wheel rotates around its rotation axis, and the rotation axis is translated left and right relative to the fixed frame.

[0015] In one of the embodiments, when the limiting wheel is in the first position, the rotation axis of the limiting wheel is coaxial with the rotation axis of the rope wheel.

[0016] In one of the embodiments, the speed limiter comprises at least two guide columns; the limiting wheel is formed with at least two guide slots; the guide columns are arranged on the fixed frame and are in guiding cooperation with the corresponding guide slots.

[0017] In one of the embodiments, one of the guide slots extends in accordance with a sine curve, and the other guide slot extends in accordance with a cosine curve.

[0018] In one of the embodiments, the speed limiter comprises a pull rope, a pulling part is formed on the limit wheel, and the pull rope is connected to the pulling part for switching between the first position and the second position.

[0019] In one of the embodiments, the speed limiter comprises a pressing mechanism, the pressing mechanism is arranged on the fixed frame, and the pressing mechanism is capable of pressing the steel wire rope when the limit wheel is in the second position.

[0020] In one of the embodiments, an outer periphery of the limit wheel is formed with a convex part, the pressing mechanism comprises a pawl and a third elastic member, one end of the pawl is formed with a convex part, the other end of the pawl is formed with a pressing block, the third elastic member is connected between the pawl and the fixed frame to facilitate the pressing block to move away from the steel wire rope, when the limit wheel is in the second position, the convex part abuts against the convex part, the pawl rotates relative to the fixed frame, and the pressing block is pressed on the steel wire rope.

[0021] The second aspect of the present application provides an elevator comprising the above-mentioned speed limiter.

[0022] The beneficial effects are:

[0023] The speed limiter and the elevator of the embodiments of the present application are provided with a fixed frame 10, a rope wheel 20, a limit wheel 30, and a speed limiting mechanism 40. The rope wheel 20 is rotationally arranged on the fixed frame 10. The rope wheel 20 is used to hang around the steel wire rope 90 connected to the car. The limit wheel 30 is arranged on the fixed frame 10. The speed limiting mechanism 40 comprises a transmission block 41, a speed limiting wheel 42, and a first elastic member 43. The transmission block 41 and the speed limiting wheel 42 are hingedly connected, and the speed limiting wheel 42 is capable of deflecting relative to the transmission block 41 based on the rotation speed of the rope wheel 20. The speed limiting wheel 42 is selectively separated from or connected to the limit wheel 30. When the rotation speed of the rope wheel 20 reaches a preset value, the speed limiting wheel 42 approaches the limit wheel 30 until the gap between the two is completely eliminated, the speed limiting wheel 42 is connected to the limit wheel 30, the transmission of the rope wheel 20 is performed through the transmission block 41, the speed limiting wheel 42, and the limit wheel 30, the limit wheel 30 arranged on the fixed frame 10 is used to brake the rapidly rotating rope wheel 20, safety is ensured, and the number of components is less than that of the centrifugal hammer, and the structure is more compact. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the speed limiter of the embodiments of the present application, wherein part of the fixed frame is omitted.

[0025] Figure 2 It is an exploded view of the speed limiter of the embodiments of the present application.

[0026] Figure 3 A structure schematic diagram of a speed limiting wheel of an embodiment of the present application.

[0027] Figure 4 A structure schematic diagram of a fast transmission of an embodiment of the present application.

[0028] Figure 5 A structure schematic diagram of a rope wheel of an embodiment of the present application, wherein the main shaft is omitted.

[0029] Figure 6 A structure schematic diagram of a limiting wheel of an embodiment of the present application.

[0030] Figure 7 A front view of a limiting wheel of an embodiment of the present application.

[0031] Figure 8 A structure schematic diagram of a pawl of an embodiment of the present application.

[0032] Figure 9 A structure schematic diagram of a fixing frame of an embodiment of the present application.

[0033] Figure 10 A normal operation principle diagram of a speed limiter of an embodiment of the present application, wherein the fixing frame is omitted and the limiting wheel is in the first position.

[0034] Figure 11 An overspeed braking principle diagram of a speed limiter of an embodiment of the present application, wherein the fixing frame is omitted and the limiting wheel is in the second position.

[0035] Figure 12 A manual braking principle diagram of a speed limiter of an embodiment of the present application, wherein the fixing frame is omitted and the limiting wheel is in the second position. DETAILED DESCRIPTION

[0036] The embodiments of the technical solutions of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs; the terms used herein are only for the purpose of describing specific embodiments of the present application, and are not intended to limit the present application; the terms “include” and “have” and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion.

[0038] In the description of the embodiments of the present application, if these technical terms "first", "second" and the like appear, these terms are only for the purpose of description and to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features.

[0039] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive or alternative embodiments. It is explicitly and implicitly understood that the embodiments described herein can be combined with other embodiments.

[0040] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are a "or" relationship.

[0041] In the description of the embodiments of the present application, if the term "multiple" appears, the meaning of "multiple" is at least two (including two), for example, two, three, etc., unless otherwise explicitly and specifically limited. Similarly, if the term "multiple groups" appears, "multiple groups" refers to two groups or more (including two groups), and if the term "multiple pieces" appears, "multiple pieces" refers to two pieces or more (including two pieces).

[0042] In the description of the embodiments of the present application, if these terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like appear, the orientation or positional relationship indicated by these terms is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the embodiments of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments of the present application.

[0043] In the description of the embodiments of the present application, unless specifically defined and limited otherwise, if there are technical terms such as "installation", "connection", "connection", "fixation" and the like, these terms should be interpreted in a broad sense. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0044] In the present application, unless specifically defined and limited otherwise, if there are similar descriptions such as "first feature on" or "second feature below" or the like, it means that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" of the second feature can be directly above or obliquely above the first feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" of the second feature can be directly below or obliquely below the first feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0045] It should be noted that if an element is referred to as "fixed to" or "provided on" another element, it can be directly on another element or there can be a middle element. If an element is considered to be "connected" to another element, it can be directly connected to another element or there can be a middle element. If present, the terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used in the present application are for illustrative purposes only and are not the only embodiment.

[0046] The first aspect of the present application provides a speed limiter, which can be used in an elevator to limit speed in an overspeed state.

[0047] Referring to Figures 1 to 12 As shown, the speed limiter includes a fixed frame 10, a rope wheel 20, a limit wheel 30, and a speed limiting mechanism 40.

[0048] The rope wheel 20 is rotatably arranged on the fixed frame 10. The rope wheel 20 is used to hang around the steel wire rope 90 connected to the car. The limit wheel 30 is arranged on the fixed frame 10. The speed limiting mechanism 40 is in driving connection with the rope wheel 20, and the speed limiting mechanism 40 can selectively separate or connect with the limit wheel 30 based on the rotation speed of the rope wheel 20.

[0049] Specifically, when the rotating speed of the rope wheel 20 does not reach the preset value, the speed limiting mechanism 40 is separated from the limiting wheel 30, and the two are not in transmission, the rope wheel 20 can drive the speed limiting mechanism 40 to rotate; when the rotating speed of the rope wheel 20 reaches the preset value, the speed limiting mechanism 40 is connected with the limiting wheel 30, at this time, the rope wheel 20 is connected with the limiting wheel 30 through the speed limiting mechanism 40, and the limiting wheel 30 arranged on the fixed frame 10 can be used to brake the rope wheel 20 rotating rapidly, so as to ensure safety.

[0050] The speed limiting mechanism 40 can include a transmission block 41, a speed limiting wheel 42 and a first elastic member 43.

[0051] The transmission block 41 is fixedly connected with the rope wheel 20, and the rotating axis 20a (mentioned below) of the rope wheel 20 passes through the middle of the transmission block 41, when the rope wheel 20 rotates, it drives the transmission block 41 to rotate around the rotating axis 20a. One end of the transmission block 41 is hinged with the speed limiting wheel 42, and the other end of the transmission block 41 is connected with the speed limiting wheel 42 through the first elastic member 43.

[0052] The first elastic member 43 can be a spring. As shown in Figure 10 When the rope wheel 20 rotates counterclockwise, it drives the transmission block 41 to rotate counterclockwise, the lower end of the transmission block 41 exerts a horizontal rightward force on the lower end of the speed limiting wheel 42, and the upper end of the transmission block 41 pulls the first elastic member 43 to the left, and after the first elastic member 43 is stretched, it pulls the speed limiting wheel 42 to the left; thus, a rotating torque is generated on the speed limiting wheel 42 to make it rotate. The faster the rotating speed of the rope wheel 20, the greater the force that the first elastic member 43 needs to exert on the speed limiting wheel 42, resulting in the first elastic member 43 being stretched.

[0053] In this way, the speed limiting wheel 42 can produce a deflection relative to the transmission block 41 based on the rotating speed of the rope wheel 20, with the hinge point of the transmission block 41 and the speed limiting wheel 42 as the rotating center; so that the speed limiting wheel 42 is selectively separated from or connected with the limiting wheel 30. The deflection angle A of the speed limiting wheel 42 relative to the transmission block 41 is positively correlated with the rotating speed of the rope wheel 20.

[0054] Again in combination with Figure 10 and Figure 11 Under normal operation, there is a certain gap between the speed limiting wheel 42 and the limiting wheel 30. When the rotating speed of the rope wheel 20 does not reach the preset value, that is, the rope wheel 20 is within the normal rotating speed range, the deflection angle A of the speed limiting wheel 42 relative to the transmission block 41 is also within a given range, and the appropriate deflection of the speed limiting wheel 42 will not cause the speed limiting mechanism 40 to be connected with the limiting wheel 30, and the speed limiting wheel 42 and the limiting wheel 30 are still in a separated state without transmission connection, and the rope wheel 20 can drive the speed limiting mechanism 40 to rotate freely.

[0055] In combination with Figure 11As shown, the faster the rope wheel rotates, the greater the deflection angle A of the speed limiting wheel 42 relative to the transmission block 41. When the rotation speed of the rope wheel 20 reaches the preset value, the speed limiting wheel 42 approaches the limiting wheel 30 until the gap between the two disappears completely, and the speed limiting wheel 42 is connected with the limiting wheel 30. At this time, the transmission from the rope wheel 20 to the limiting wheel 30 through the transmission block 41 and the speed limiting wheel 42 is realized, and the limiting wheel 30 arranged on the fixed frame 10 is used to brake the fast rotating rope wheel 20, thereby ensuring safety.

[0056] In the related art, the centrifugal hammer and other technical solutions are used to realize the function of overspeed limiting. The speed limiter of the present application is matched with the limiting wheel 30 through the transmission block 41, the speed limiting wheel 42 and the first elastic member 43. Compared with the centrifugal hammer used in the related art, the number of components of the speed limiter is smaller, and the structure is more compact. In addition, due to the compact structure of the speed limiter of the present application, the volume occupied by the speed limiter is smaller, which is beneficial to reducing the space occupied by the speed limiter in the elevator shaft and facilitating the miniaturization of the elevator shaft. Moreover, due to the smaller number of components and the smaller volume of the speed limiter of the present application, the mass of the speed limiter is smaller, thereby reducing the work intensity of the on-site installation personnel.

[0057] In various embodiments of the present application, the preset value of the rotation speed of the rope wheel 20 is a parameter quantity set by the designer according to the specific use environment, which can be usually 1 revolution per second to 100 revolutions per second.

[0058] In some embodiments, referring to Figures 1 to 4 As shown, the transmission block 41 includes a block body 411 and a protrusion 412 protruding from the block body 411.

[0059] The speed limiting wheel 42 can be a disc-shaped wheel with an eccentric structure. The speed limiting wheel 42 is formed with a deflection groove 422.

[0060] The transmission block 41 is formed with a first pin hole 415. The first pin hole 415 can be located at the lower part of the block body 411 away from the protrusion 412. The speed limiting wheel 42 is formed with a second pin hole 423, which can be located below the deflection groove 422. The speed limiting mechanism 40 includes a pin shaft 44. The pin shaft 44 penetrates the first pin hole 415 and the second pin hole 423, so that the lower part of the block body 411 away from the protrusion 412 is rotationally connected with the speed limiting wheel 42.

[0061] The protrusion 412 is at least partially located in the deflection groove 422. The first elastic member 43 connects the speed limiting wheel 42 and the protrusion 412.

[0062] The width of the deflection groove 422 is wider than that of the protrusion 412. In combination with Figure 10 and Figure 11As shown, normally, the protrusion 412 is located in the deflection groove 422, and both sides have a certain gap. When the rope wheel 20 rotates counterclockwise, the transmission block 41 is driven to rotate counterclockwise, the lower end of the transmission block 41 exerts a horizontal rightward force on the lower end of the speed limiting wheel 42, the upper end of the transmission block 41 pulls the first elastic member 43 to the left, and the protrusion 412 at the upper end of the transmission block 41 is deflected to the left relative to the deflection groove 422.

[0063] As the rotation speed of the rope wheel 20 increases, the speed limiting wheel 42 continues to rotate under the joint action of the first elastic member 43 and the lower second pin hole 423, the force provided by the first elastic member 43 to the speed limiting wheel 42 increases, the opening amount of the first elastic member 43 increases, and the gap between the protrusion 412 at the upper end of the transmission block 41 and the deflection groove 422 decreases; when the rotation speed of the rope wheel 20 reaches or exceeds the preset value, the speed limiting wheel 42 approaches the limiting wheel 30 until the gap between the two disappears completely, and the speed limiting wheel 42 is connected with the limiting wheel 30 (such as Figure 11 F in the drawing), at this time, the speed limiting wheel 42 is clamped by the limiting wheel 30 to limit rotation, and the transmission block 41 continues to rotate until the protrusion 412 at the upper end of the transmission block 41 abuts against the side wall of the deflection groove 422 (such as Figure 11 E in the drawing), so that the rotation of the transmission block 41 is limited, and the transmission block 41 and the rope wheel 20 are circumferentially fixedly installed together, that is, the rotation of the rope wheel 20 is limited, ensuring safety.

[0064] Optionally, referring to Figures 1 to 7 As shown, the outer peripheral wall of the speed limiting wheel 42 is formed with a tooth portion 421. The limiting wheel 30 is a circular ring structure, and the speed limiting wheel 42 is arranged in the limiting wheel 30. The inner peripheral wall of the limiting wheel 30 is formed with at least one ratchet 31 matched with the tooth portion 421.

[0065] As shown in Figure 10 , normally, there is a gap between the tooth portion 421 and the inner peripheral wall of the limiting wheel 30; and the tooth portion 421 is not connected with the ratchet 31. When the rotation speed of the rope wheel 20 does not reach the preset value, that is, the rope wheel 20 is within the normal speed range, the deflection angle A of the speed limiting wheel 42 relative to the transmission block 41 is also within a given range, and appropriate deflection of the speed limiting wheel 42 will reduce the gap between the tooth portion 421 and the inner peripheral wall of the limiting wheel 30, and the tooth portion 421 is not connected with the ratchet 31, so the speed limiting wheel 42 and the limiting wheel 30 are not in transmission connection but are still in a separated state, and the rope wheel 20 can drive the speed limiting mechanism 40 to rotate freely.

[0066] As shown in Figure 11As shown, the faster the rope wheel rotates, the greater the deflection angle A of the speed limiting wheel 42 relative to the transmission block 41. When the rotation speed of the rope wheel 20 reaches the preset value, the gap between the tooth portion 421 and the inner wall of the limiting wheel 30 is reduced until the gap disappears completely, and the tooth portion 421 is engaged with the ratchet 31. At this time, the rope wheel 20 is driven by the transmission block 41, the speed limiting wheel 42 and the limiting wheel 30, and the limiting wheel 30 provided on the fixed frame 10 is used to brake the fast rotating rope wheel 20 to ensure safety.

[0067] In some embodiments, referring to Figures 1 to 5 As shown, the rope wheel 20 includes a main shaft 21, a wheel body 22 having a shaft tube 221, and a transmission connection portion 23 on the shaft tube 221.

[0068] The main shaft 21 can be drivingly connected with an external power mechanism, the main shaft 21 is arranged in the shaft tube 221, and the wheel body 22 is installed on the main shaft 21 and fixed in the circumferential and axial directions.

[0069] The transmission block 41 includes a mounting hole 413 penetrating the block body 411 and a limiting groove 414, and the main shaft 21 is arranged in the mounting hole 413. The limiting groove 414 is in limiting cooperation with the transmission connection portion 23.

[0070] Specifically, the mounting hole 413 is located in the middle of the block body 411, and the limiting groove 414 is in communication with the mounting hole 413; the main shaft 21 drives the wheel body 22 to rotate correspondingly, so that the travel speed of the car hanging on the steel wire rope 90 can be controlled. The main shaft 21 is arranged in the mounting hole 413, so that the transmission block 41 and the wheel body 22 are fixed in the axial and circumferential directions. The wheel body 22 drives the transmission block 41 to rotate through the cooperation of the transmission connection portion 23 and the limiting groove 414. In turn, when the transmission block 41 is circumferentially limited by the speed limiting wheel 42, the wheel body 22 stops rotating under the cooperation of the transmission connection portion 23 and the limiting groove 414.

[0071] Alternatively, the fixed frame 10 can be a metal shell with a U-shaped cross section, and the U-shaped grooves can conveniently accommodate the wheel body 22, the speed limiting wheel 42, the limiting wheel 30, etc. of the rope wheel 20; the fixed frame 10 has a first rotating hole 11 on the surface thereof, which cooperates with the main shaft 21; and the main shaft 21 is rotatably arranged in the first rotating hole 11, so that the wheel body 22 is fixedly installed on the main shaft 21 to achieve rotational connection with the fixed frame 10.

[0072] Alternatively, referring to Figures 1 to 9 As shown, the bottom of the U-shaped groove of the fixed frame 10 can be formed with an avoiding groove 14 to avoid the passing steel wire rope 90.

[0073] In some embodiments, referring to Figure 10 and Figure 11As shown, the first connecting line OP is formed between the hinging point O of the transmission block 41 and the gear portion 421 of the speed limiting wheel 42, and the second connecting line OD is formed between the hinging point O of the transmission block 41 and the rotating axis 20a of the rope wheel 20; the deflection angle A is formed between the first connecting line OP and the second connecting line OD. The greater the rotating speed of the rope wheel 20, the greater the deflection angle A, and the greater the distance between the gear portion 421 and the rotating axis of the rope wheel 20.

[0074] When the rotating speed of the rope wheel 20 does not reach the preset value, the deflection angle A of the speed limiting wheel 42 relative to the transmission block 41 is also within the given angle range, the distance between the gear portion 421 and the rotating axis 20a of the rope wheel 20 is smaller than the distance between the limiting wheel 30 and the rotating axis of the rope wheel 20, and the gear portion 421 is separated from the ratchet teeth 31 on the limiting wheel 30.

[0075] When the rotating speed of the rope wheel 20 reaches or exceeds the preset value, the convex block 412 at the upper end of the transmission block 41 is in contact with the side wall of the deflection groove 422, the deflection angle A of the speed limiting wheel 42 relative to the transmission block 41 reaches the maximum value of the angle range, at this time, the speed limiting wheel 42 and the transmission block 41 no longer rotate relative to each other, the distance between the gear portion 421 and the rotating axis of the rope wheel 20 is equal to the distance between the limiting wheel 30 and the rotating axis of the rope wheel 20, and the gear portion 421 is engaged with the ratchet teeth 31 on the limiting wheel 30; in this way, the rope wheel 20 is connected with the limiting wheel 30 through the transmission block 41 and the speed limiting wheel 42, and the limiting wheel 30 arranged on the fixed frame 10 can be used to brake the rapidly rotating rope wheel 20, thereby ensuring safety.

[0076] In various embodiments of the present application, the angle range of the deflection angle A is a parameter set by the designer according to the specific use environment, and corresponds to the preset value of the rotating speed of the rope wheel 20.

[0077] In some embodiments, referring to Figures 1 to 3 As shown, the speed limiting mechanism 40 includes a counterweight 45, and the speed limiting wheel 42 is provided with an adjusting groove 424; the counterweight 45 is detachably installed on the adjusting groove 424.

[0078] The adjusting groove 424 is usually a long slot, which can be arranged beside the deflection groove 422; the counterweight 45 can be fixed at any position of the adjusting groove 424 by means of bolt connection. Usually, the counterweight 45 is not arranged at the geometric center of the speed limiting wheel 42, and in addition, the counterweight 45 should not be on the rotation axis 20a of the rope wheel 20. In this way, by adjusting the mass and the fixed position of the counterweight 45, the mass center of the speed limiting wheel 42 and the counterweight 45 as a whole is offset, and a certain distance is formed between the mass center and the rotation axis 20a of the rope wheel 20. When the transmission block 41 and the first elastic member 43 act on the speed limiting wheel 42 to make it rotate, the eccentric mass makes the first elastic member 43 need to exert a certain force on the speed limiting wheel 42, which in turn acts on the first elastic member 43, causing the first elastic member 43 to be elongated.

[0079] In this way, by designing the eccentric mass, the length, the elastic coefficient and other factors of the first elastic member 43, the designer can flexibly adjust the preset value of the rotation speed of the rope wheel 20.

[0080] In some embodiments, the limit wheel 30 can be fixedly arranged on the fixed frame 10, so that when the rope wheel 20 rotates at an excessive speed, the transmission block 41, the speed limiting wheel 42 and the limit wheel 30 can be connected to realize braking, thereby ensuring safety.

[0081] Unlike the embodiment in the previous paragraph, the limit wheel 30 can be movably arranged on the fixed frame 10. The limit wheel 30 has a first position and a second position relative to the fixed frame 10. When the speed limiting wheel 42 is connected with the limit wheel 30, the speed limiting wheel 42 can drive the limit wheel 30 to switch from the first position to the second position. When the limit wheel 30 is in the second position, the rope wheel 20 can be stopped by the speed limiting mechanism 40 and the limit wheel 30.

[0082] As shown in Figure 10 Under normal operation, there is a certain gap between the speed limiting wheel 42 and the limit wheel 30, and the deflection angle A of the speed limiting wheel 42 relative to the transmission block 41 is also within a given range, and the speed limiting wheel 42 and the limit wheel 30 are still in a separated state, that is, the speed limiting wheel 42 deflects relative to the transmission block 41 under the action of the rotation speed, but the limit wheel 30 is always in the first position.

[0083] As shown in Figure 11 When the speed limiter operates at an excessive speed, the rotation speed of the rope wheel 20 reaches or exceeds the preset value, the tooth portion 421 on the speed limiting wheel 42 approaches the ratchet teeth 31 on the limit wheel 30 until they mesh (as shown in F), and the speed limiting wheel 42 is connected with the limit wheel 30.

[0084] In one aspect, the transmission block 41 continues to rotate until the protrusion 412 at the upper end of the transmission block 41 abuts against the side wall of the deflection groove 422 (as shown at E), which limits further deflection of the transmission block 130 and the speed limiting wheel 42, while the transmission block 41 and the rope wheel 20 are fixed together, i.e. limiting relative rotation between the rope wheel 110 and the speed limiting wheel 42.

[0085] On the other hand, under the rotational inertia of the rope wheel 20, the speed limiting wheel 42 drives the limiting wheel 30 to switch from the first position to the second position according to a preset path; when the limiting wheel 30 reaches the second position, it can no longer continue to act, at which time the limiting wheel 30 and the fixed frame 10 remain relatively fixed, and the rope wheel 20 can be stopped by the speed limiting mechanism 40 and the limiting wheel 30, i.e. the stopped limiting wheel 30 is transmitted to the rope wheel 20 through the speed limiting wheel 42 and the transmission block 41, limiting the continued rotation of the rope wheel 20, and ensuring safety.

[0086] It should be noted that the speed limiting wheel 42 drives the limiting wheel 30 to switch from the first position to the second position according to a preset path, which plays a buffering role in the braking process of the entire speed limiter, avoiding a huge braking impact.

[0087] In some embodiments, referring to Figures 1 to 12 As shown, the speed limiter can include a second elastic member 50 connected between the limiting wheel 30 and the fixed frame 10, for urging the limiting wheel 30 to remain in the first position.

[0088] Optionally, the second elastic member 50 is a spring.

[0089] In some embodiments, referring to Figures 10 to 12 As shown, in the process of switching between the first position and the second position, the limiting wheel 30 rotates around its rotation axis 30a, and the rotation axis 30a translates left and right relative to the fixed frame 10.

[0090] In the process that the limiting wheel 30 switches from the first position to the second position, the limiting wheel 30 rotates counterclockwise around its rotation axis 30a, and the rotation axis 30a translates left relative to the fixed frame 10; conversely, in the process that the limiting wheel 30 switches from the second position to the first position, the limiting wheel 30 rotates clockwise around its rotation axis 30a, and the rotation axis 30a translates right relative to the fixed frame 10. That is to say, the limiting wheel 30 is similar to a wheel walking on the ground. When the speed limiter runs at an overspeed, under the rotation inertia of the rope wheel 20 rotating counterclockwise, the tooth part 421 on the speed limiting wheel 42 drives the ratchet teeth 31 on the limiting wheel 30 to rotate counterclockwise, thereby making any point of the limiting wheel 30 move in a circular motion around its rotation axis 30a, and at the same time, the limiting wheel 30 as a whole moves horizontally left relative to the fixed frame 10, so that the gap between the top end of the tooth part 421 on the speed limiting wheel 42 and the tooth bottom of the ratchet teeth 31 on the limiting wheel 30 becomes smaller, and thus the connection between the limiting wheel 30 and the speed limiting wheel 42 is more closely and will not be disconnected when the limiting wheel 30 switches from the first position to the second position.

[0091] In some embodiments, as shown in Figure 2 , Figure 5 , Figure 6 , and Figures 10 to 12 , when the limiting wheel 30 is in the first position, the rotation axis 30a of the limiting wheel 30 is coaxial with the rotation axis 20a of the rope wheel 20.

[0092] The rotation axis 20a of the rope wheel 20 is also the rotation center of the transmission block 41 and the speed limiting wheel 42; therefore, the coaxial relationship between the rotation axis 30a and the rotation axis 20a of the rope wheel 20 can make the distance between each point on the inner circumference of the limiting wheel 30 and each place on the outer circumference of the speed limiting wheel 42 consistent, and the gap between the two is also the largest, which facilitates the design of the maximum range of the deflection angle A of the speed limiting wheel 42 relative to the transmission block 41.

[0093] In some embodiments, as shown in Figures 1 to 12 , the speed limiter comprises at least two guide columns 60; the limiting wheel 30 is formed with at least two guide grooves 32; the guide columns 60 are arranged on the fixed frame 10 and guidedly matched with the corresponding guide grooves 32.

[0094] The guide columns 60 are arranged on the fixed frame 10. Specifically, the plate surface of the fixed frame 10 can be formed with a second rotation hole 12; the guide columns 60 are arranged in the second rotation hole 12, and the end of the guide column 60 can be axially fixed with the fixed frame 10 through a sleeve 61 and a nut 62; each guide groove 32 is matched with the guide column 60 correspondingly, so that the limiting wheel 30 can rotate around its rotation axis 30a and the rotation axis 30a can translate left and right relative to the fixed frame 10 in the process of switching between the first position and the second position.

[0095] The guide groove 32 is usually a smooth curved section, and the two ends of each guide groove 32 correspond to the first position and the second position of the limit wheel 30, respectively.

[0096] Taking two guide grooves 32 and two guide posts 60 as an example, the guide grooves 32 are distributed on both sides of the disc surface of the limiting wheel 32. Combined with... Figure 10 As shown, the left guide post 60 is located at the lower end of the left guide groove 32, and the right guide post 60 is located at the upper end of the right guide groove 32; at this time, the positional relationship between the guide groove 32 and the guide post 60 corresponds to the first position of the limiting wheel 30. Combined with... Figure 11 As shown, the left guide post 60 is located at the upper end of the left guide groove 32, and the right guide post 60 is located at the lower end of the right guide groove 32. At this time, the positional relationship between the guide groove 32 and the guide post 60 corresponds to the second position of the limiting wheel 30.

[0097] Combination Figure 10 and Figure 11 As shown, when the limiting wheel 30 switches from the first position to the second position, the left guide groove 32 moves diagonally downward relative to the left guide post 60 until the guide post 60 abuts against the upper end of the guide groove 32 (e.g., Figure 11 At point J), the guide groove 32 on the right moves obliquely to the left and upward relative to the guide post 60 on the right; thus, the limiting wheel 30 rotates counterclockwise around its own rotation axis 30a, and the rotation axis 30a translates to the left relative to the fixed frame 10. The limiting wheel 30 switches from the second position to the first position, and vice versa, which will not be described in detail here.

[0098] Optionally, in actual setup, one of the guide grooves 32 can be extended a certain length according to a sine curve, and the other guide groove 32 can be extended a certain length according to a cosine curve. In this way, guided by the guide grooves 32 and the guide post 60, the limiting wheel 30 rotates around its own rotation axis 30a during the switching between the first and second positions, and the rotation axis 30a translates left and right relative to the fixed frame 10.

[0099] In some other embodiments, the guide groove can be set on the fixed frame 10, and the corresponding guide post can be set on the limiting wheel 30, which can also achieve the same guiding effect.

[0100] In some embodiments, see Figures 1 to 12 As shown, the speed limiter includes a pull rope (not shown), and a pulling part 33 is formed on the limit wheel 30. The pull rope is connected to the pulling part 33 for switching between the first position and the second position.

[0101] In some manual situations, such as emergency elevator operation or routine maintenance, operators need to manually activate the speed governor to ensure safety.

[0102] Combination Figure 12 As shown, by pulling the pull rope to pull the pull part 33 installed on the limiting wheel 30, the limiting wheel 30 rotates counterclockwise, and the limiting wheel 30 rotates eccentrically along the guide structure, for example, a guide groove 32 extending along the sine or cosine can be used, so that the limiting wheel 30 rotates counterclockwise around its rotation axis 30a, and the rotation axis 30a translates left relative to the fixed frame 10.

[0103] It needs to be understood that generally in a manual case, the rope wheel 20 is generally not started to rotate, so there is no transmission speed between the speed limiting wheel 42 and the transmission block 41, the deflection angle is small, and the transmission block 41 has a certain gap with the side wall of the deflection groove 422. After the limiting wheel 30 is offset to the left, the ratchet teeth 41 on the inner circumferential surface of the limiting wheel 30 offset to the right, so that the teeth 421 on the speed limiting wheel 42 can be continuously approached, until the teeth 421 on the speed limiting wheel 42 are fully engaged with the ratchet teeth 31 on the limiting wheel 30, thereby triggering the speed limiter.

[0104] After triggering the speed limiter, even if the rope wheel 20 is started to rotate counterclockwise due to other accidental conditions, the rope wheel 20 drives the transmission block 41 to rotate counterclockwise, since the speed limiting wheel 42 has been connected with the limiting wheel 30, the limiting wheel 30 remains stationary in the second position, the transmission block 41 will continue to rotate until the protrusion 412 at the upper end of the transmission block 41 abuts against the side wall of the deflection groove 422; the limiting wheel 30 is stopped by the speed limiting wheel 42, the transmission block 41, and finally transmitted to the rope wheel 20, limiting the continuous rotation of the rope wheel 20, and ensuring safety.

[0105] In some embodiments, referring to Figures 1 to 12 As shown, the speed limiter comprises a pressing mechanism 70. The pressing mechanism 70 is arranged on the fixed frame 10, and can press the steel wire rope 90 when the limiting wheel 30 is in the second position.

[0106] Specifically, the outer periphery of the limiting wheel 30 is outwardly protruded to form a protruding part 34; the pressing mechanism 70 comprises a pawl 71 and a third elastic member 72, the pawl 71 is rotationally arranged on the fixed frame 10, one end of the pawl 71 is formed with a protruding part 711, and the other end is formed with a pressing block 712; the third elastic member 72 is connected between the pawl 71 and the fixed frame 10 to urge the pressing block 712 away from the steel wire rope 90.

[0107] When the limiting wheel 30 is in the second position, the protruding part 34 abuts against the protruding part 711, the pawl 71 rotates relative to the fixed frame 10, and the pressing block 712 is pressed on the steel wire rope 90.

[0108] The pressing mechanism 70 can further comprise a rotating shaft 75, the pawl 71 is formed with a rotating shaft hole 713, the fixed frame 10 is formed with a third rotation hole 13, and the rotating shaft 75 is arranged in the rotating shaft hole 713 and the third rotation hole 13.

[0109] In combination Figures 10 to 12 As shown, when the limiting wheel 30 is switched from the first position to the second position, the limiting wheel 30 rotates counterclockwise around its rotation axis 30a, and the convex portion 34 moves upward to abut against the protruding portion 711, so that the one end of the pawl 71 forming the protruding portion 711 rotates clockwise around the rotation shaft 75; so that the one end of the pawl 71 forming the pressing block 712 approaches the left until it abuts against the steel wire rope 90 on the rope wheel 20 (as shown at H in FIG. 7). The pressing block 712 can be made of a wear-resistant high-hardness composite material, and the friction between the pressing block 712 and the steel wire rope 90 can effectively brake the steel wire rope 90. Figure 11

[0110] The second aspect of the present application provides an elevator comprising the above-described speed limiter.

[0111] In some embodiments, the elevator comprises a car and a steel wire rope 90, which is hung around the rope wheel 20 for hoisting the car.

[0112] The technical features of the above-described embodiments can be combined in any manner. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described, but it should be considered that any combination of the technical features is within the scope of the present application as long as the combination does not result in contradictions.

[0113] The above-described embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the patent application scope. It should be noted that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present application, and these are within the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.​

Claims

1. A speed limiter, characterized in that, include: Fixture (10); A rope pulley (20) is rotatably mounted on the fixed frame (10); the rope pulley (20) is used to hang the wire rope (90). A limiting wheel (30) is provided on the fixed frame (10); And a speed limiting mechanism (40), the speed limiting mechanism (40) including a transmission block (41), a speed limiting wheel (42) and a first elastic element (43); The transmission block (41) is fixedly connected to the rope wheel (20); One end of the transmission block (41) is hinged to the speed limiting wheel (42), and the other end of the transmission block (41) is connected to the speed limiting wheel (42) through the first elastic element (43). The speed limiting wheel (42) can deflect relative to the transmission block (41) based on the rotational speed of the rope wheel (20); so that the speed limiting wheel (42) can selectively separate from or connect to the limiting wheel (30); The pulley (20) includes a main shaft (21), a wheel body (22) having a shaft tube (221), and a transmission connection part (23) located on the shaft tube (221), wherein the main shaft (21) passes through the shaft tube (221). The transmission block (41) includes a mounting hole (413) and a limiting groove (414). The main shaft (21) passes through the mounting hole (413), and the limiting groove (414) is in a limiting fit with the transmission connection part (23). The speed limiting wheel (42) has teeth (421) formed on its outer peripheral wall; the limiting wheel (30) has a ring structure, and the speed limiting wheel (42) is disposed inside the limiting wheel (30); the limiting wheel (30) has at least one ratchet (31) formed on its inner peripheral wall that engages with the teeth (421). The hinge point between the transmission block (41) and the speed limiting wheel (42) forms a first line to the tooth (421), and the hinge point between the transmission block (41) and the speed limiting wheel (42) forms a second line to the rotation axis of the rope wheel (20); a deflection angle is formed between the first line and the second line. The greater the rotational speed of the pulley (20), the greater the deflection angle, and the longer the distance from the tooth (421) to the rotation axis of the pulley (20).

2. The speed limiter according to claim 1, characterized in that, The transmission block (41) includes a block body (411) and a protrusion (412) protruding from the block body (411). A deflection groove (422) is formed on the speed limiting wheel (42); the lower part of the block body (411) away from the protrusion (412) is rotatably connected to the speed limiting wheel (42), the protrusion (412) is at least partially located in the deflection groove (422), and the first elastic member (43) connects the speed limiting wheel (42) and the protrusion (412).

3. The speed limiter according to claim 1, characterized in that, The speed limiting mechanism (40) includes a pin (44); a first pin hole (415) is formed on the transmission block (41); a second pin hole (423) is formed on the speed limiting wheel (42), and the pin (44) passes through the first pin hole (415) and the second pin hole (423).

4. The speed limiter according to any one of claims 1 to 3, characterized in that, The speed limiting mechanism (40) includes a counterweight (45). An adjustment groove (424) is formed on the speed limiting wheel (42); the counterweight (45) is detachably mounted on the adjustment groove (424).

5. The speed limiter according to any one of claims 1 to 3, characterized in that, The speed limiter includes a second elastic element (50); The limiting wheel (30) has a first position and a second position relative to the fixing frame (10); The second elastic element (50) is used to keep the limiting wheel (30) in the first position; When the speed limiting wheel (42) is connected to the limiting wheel (30), the speed limiting wheel (42) can drive the limiting wheel (30) to switch from the first position to the second position; When the limiting wheel (30) is in the second position, the rope wheel (20) can stop rotating from the limiting wheel (30) through the speed limiting mechanism (40).

6. The speed limiter according to claim 5, characterized in that, During the switching between the first position and the second position, the limiting wheel (30) rotates around its own rotation axis (30a), and the rotation axis (30a) translates left and right relative to the fixed frame (10).

7. The speed limiter according to claim 6, characterized in that, When the limiting wheel (30) is in the first position, the rotation axis (30a) of the limiting wheel (30) is coaxial with the rotation axis (20a) of the rope wheel (20).

8. The speed limiter according to claim 5, characterized in that, The speed limiter includes at least two guide posts (60); the limiting wheel (30) has at least two guide grooves (32). The guide post (60) is disposed on the fixed frame (10) and is guided and engaged with the corresponding guide groove (32).

9. The speed limiter according to claim 8, characterized in that, One of the guide grooves (32) extends in the form of a sine curve, and the other guide groove (32) extends in the form of a cosine curve.

10. The speed limiter according to claim 5, characterized in that, The speed limiter includes a pull rope, and a pulling part (33) is formed on the limiting wheel (30). The pull rope is connected to the pulling part (33) for switching between a first position and a second position.

11. The speed limiter according to claim 5, characterized in that, The speed limiter includes a clamping mechanism (70); The clamping mechanism (70) is mounted on the fixed frame (10). When the limiting wheel (30) is in the second position, the clamping mechanism (70) can clamp the wire rope (90).

12. The speed limiter according to claim 11, characterized in that, The outer periphery of the limiting wheel (30) has a protrusion (34). The clamping mechanism (70) includes a pawl (71) and a third elastic element (72). The pawl (71) is rotatably mounted on the fixed frame (10). One end of the pawl (71) has a protrusion (711) and the other end has a pressure block (712). The third elastic element (72) is connected between the pawl (71) and the fixing frame (10) to cause the pressure block (712) to move away from the wire rope (90). When the limiting wheel (30) is in the second position, the protrusion (34) abuts against the protrusion (711), the pawl (71) rotates relative to the fixing frame (10), and the pressure block (712) presses against the wire rope (90).

13. An elevator, characterized in that, Including the speed limiter as described in any one of claims 1 to 12.

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