CN115893146B - Elevator speed limiting device capable of switching two rated speeds at any time and elevator speed increasing method - Google Patents

Abstract

The invention relates to an elevator speed limiting device capable of switching two rated speeds at any time, which comprises: a rated speed detecting mechanism and a stopping mechanism arranged on the rope pulley; the rated speed detection mechanism comprises a centrifugal motion component and an elastic component, wherein the centrifugal motion component is rotationally connected with the rope pulley through a rotating shaft, the centrifugal motion component performs centrifugal motion along with the rotation of the rope pulley, one end of the elastic component is movably connected with one end of the centrifugal motion component, the other end of the elastic component is movably connected on the rope pulley, and the elastic component is used for adjusting the pressure applied to the centrifugal motion component, and the pressure is opposite to the centrifugal force generated by the centrifugal motion of the centrifugal motion component; the stop mechanism is arranged on the bracket of the rope pulley and is electrically connected with the elevator controller and used for limiting the movement of the centrifugal movement component; the rated speed detecting mechanism is used for detecting the rated speed of one elevator car when the stopping mechanism is operated, and is used for detecting the rated speed of the other elevator car when the stopping mechanism is not operated.

Description

Elevator speed limiting device capable of switching two rated speeds at any time and elevator speed increasing method

Technical Field

The invention relates to an elevator speed limiting device capable of switching two rated speeds at any time and an elevator speed increasing method, and belongs to the technical field of elevator speed limiters and speed increasing elevators.

Background

An elevator speed limiter is one of safety control components in an elevator safety protection system. When the elevator runs at a speed exceeding the rated speed or falls at risk due to whatever reason, under the condition that all other safety protection devices do not work, the speed limiter and the safety tongs perform linkage action, so that the elevator car is stopped on the guide rail, and the safety of personnel and equipment is ensured.

With the continuous development of elevators, an elevator system capable of switching two rated speeds during operation has been developed, for example, the invention patent with the patent number of CN109969879a discloses an elevator and a control method for operating in different areas and different rated speeds, and an elevator car is controlled to operate in different areas of a hoistway so as to improve the overall operation speed of the elevator;

However, there is basically no speed limiter capable of matching such a multi-rated speed elevator, and as in the prior art, as in the patent of the invention of patent No. CN104583108a, there is provided an elevator apparatus in which the rated speed at the time of ascent and the rated speed at the time of descent of an elevator car are different, a sheave supported by a horizontal shaft and wound with an upper end of a speed governor rope and two kinds of driven sprockets are provided, and a transmission chain is slidable to a gear of either of the two kinds of driven sprockets, and the transmission chain is switched to the driven sprocket via a sliding unit according to the running direction of the elevator car, and by driving a bevel gear and the driven bevel gear, a prescribed overspeed at the time of ascent is detected by a speed governor and a prescribed overspeed at the time of descent is detected; this prior art utilizes the drive structure of chain sprocket to carry out the gear and switch when the elevator rises with descend, realizes detecting different rated speeds, but this prior art has the problem that can not switch at any time, only can switch when the elevator stops to the mode that switches through the drive structure of chain sprocket can have the condition of chain off or broken chain, leads to out of control, can't ensure reliable elevator overspeed protection.

Disclosure of Invention

In order to solve the problems in the prior art, the invention provides an elevator speed limiting device capable of switching two rated speeds at any time and an elevator speed increasing method.

The technical scheme of the invention is as follows:

in one aspect, the present invention provides an elevator speed limiting device capable of switching two rated speeds at any time, comprising:

a rated speed detecting mechanism and a stopping mechanism arranged on the rope pulley;

The rated speed detection mechanism comprises a centrifugal motion part and an elastic part, wherein the centrifugal motion part is rotationally connected with the rope pulley through a rotating shaft, the centrifugal motion part performs centrifugal motion along with the rotation of the rope pulley, one end of the elastic part is movably connected with one end of the centrifugal motion part, the other end of the elastic part is movably connected with the rope pulley, and the elastic part is used for adjusting pressure applied to the centrifugal motion part, and the pressure is opposite to the centrifugal force generated by the centrifugal motion of the centrifugal motion part;

The stop mechanism is arranged on the support of the rope pulley and is electrically connected with the elevator controller, and the stop mechanism acts according to instructions sent by the elevator controller and is used for limiting the movement of the centrifugal movement component;

The rated speed detecting mechanism is used for detecting the rated speed of one elevator car operation when the stopping mechanism is operated, and is used for detecting the rated speed of the other elevator car operation when the stopping mechanism is not operated.

As a preferred embodiment, the stop mechanism includes a core, an extension piece, and a coil;

The iron core is arranged on a rotating shaft of the rope pulley and rotates along with the rope pulley;

the coil is fixed in front of the rope pulley through a bracket of the rope pulley and sleeved outside the iron core;

the coil is electrically connected with the elevator controller, and the coil is controlled to be powered on or powered off by the elevator controller;

The main body of the centrifugal motion component is not interfered with the iron core, an extension piece made of metal iron is arranged on the centrifugal motion component, one end of the extension piece is fixedly connected with the centrifugal motion component, and the other end of the extension piece extends to the range of the end face of the iron core, facing the rope pulley, and is matched with the iron core to suck and release the iron core.

As a preferred embodiment, two ends of the coil are connected in parallel with an RC series circuit.

As a preferred embodiment, the centrifugal motion component comprises a first centrifugal motion structure and a second centrifugal motion structure;

the elastic component comprises a first elastic structure and a second elastic structure;

one end of the first elastic structure is movably connected with one end of the first centrifugal motion structure, the other end of the first elastic structure is movably connected to the rope pulley, and the first elastic structure is used for adjusting pressure applied to the end part of the first centrifugal motion structure; the first centrifugal motion structure makes centrifugal motion along with the rotation of the rope pulley;

one end of the second elastic structure is movably connected with one end of the second centrifugal motion structure, the other end of the second elastic structure is movably connected to the rope pulley, and the second elastic structure is used for adjusting pressure applied to the end part of the second centrifugal motion structure; the second centrifugal motion structure makes centrifugal motion along with the rotation of the rope pulley;

the first centrifugal movement structure and the first elastic structure form a first rated speed detection assembly, the second centrifugal movement structure and the second elastic structure form a second rated speed detection assembly, and the two rated speed detection assemblies are arranged in the rope pulley in a mirror image mode by taking the center of the rope pulley as a midpoint;

The first elastic structure is adjusted to enable the first rated speed detection assembly to be used for detecting the first rated speed, the second elastic structure is adjusted to enable the second rated speed detection assembly to be used for detecting the second rated speed, and the second rated speed is larger than the first rated speed;

And when the stopping mechanism acts, a control force is applied to the first centrifugal movement structure, and the resultant force of the control force and the pressure applied by the first elastic structure to the end part of the first centrifugal movement structure is larger than the centrifugal force generated on the first centrifugal movement structure when the rope wheel reaches the second rated speed.

As a preferred embodiment, the centrifugal motion part comprises a pair of third centrifugal motion structures and a linkage rod; the two third centrifugal movement structures are arranged in the rope pulley in a mirror image mode by taking the center of the rope pulley as a midpoint, two ends of the linkage rod are respectively connected with the two third centrifugal movement structures, and the two third centrifugal movement structures synchronously move through the linkage rod;

The elastic component comprises a third elastic structure; one end of the third elastic structure is movably connected with one end of one of the third centrifugal movement structures, the other end of the third elastic structure is movably connected to the rope pulley, and the third elastic structure is used for adjusting pressure applied to the end part of the corresponding third centrifugal movement structure;

When the stop mechanism does not act, the two third centrifugal movement structures and the third elastic structure form a first rated speed detection assembly for detecting the first rated speed;

When the stop mechanism acts, a control force is applied to the two third centrifugal movement structures or one of the two third centrifugal movement structures, and a second rated speed detection assembly is formed by the two third centrifugal movement structures and the third elastic structure and is used for detecting a second rated speed; the second rated speed is greater than the first rated speed.

On the other hand, the invention also provides an elevator speed-increasing method, which is realized based on the elevator speed-limiting device capable of switching two rated speeds at any time according to any embodiment of the invention, and comprises the following steps:

Dividing the top and bottom regions of the hoistway into first rated speed regions;

When the elevator goes up, detecting whether the weight of the elevator car is less than or equal to the weight of the balancing weight; when the weight of the lift car is smaller than or equal to the weight of the balancing weight, the lift controller controls to send a command to the stop mechanism, so that the stop mechanism is switched to detect the second rated speed, and meanwhile, the lift controller controls the lift car to run at the second rated speed; when the elevator ascends to a first rated speed area at the top of the hoistway, the elevator controller controls to send a command to the stop mechanism, so that the stop mechanism is switched to detect the first rated speed, and meanwhile, the elevator controller controls the elevator car to run at the first rated speed;

when the elevator descends, detecting whether the weight of the elevator car is more than or equal to the weight of the balancing weight; when the weight of the lift car is greater than or equal to that of the balancing weight, the lift controller controls to send a command to the stop mechanism, so that the stop mechanism is switched to detect the second rated speed, and meanwhile, the lift controller controls the lift car to run at the second rated speed; when the elevator descends to a first rated speed area at the bottom of the well, the elevator controller controls to send a command to the stopping mechanism, so that the stopping mechanism is switched to detect the first rated speed, and meanwhile, the elevator controller controls the elevator car to run at the first rated speed.

The invention has the following beneficial effects:

1. the invention relates to an elevator speed limiting device capable of switching two rated speeds at any time, which is provided with a first rated speed detecting mechanism and a second rated speed detecting mechanism which are respectively and independently operated, wherein the first rated speed detecting mechanism and the second rated speed detecting mechanism are respectively used for detecting the first rated speed and the second rated speed, and a stop mechanism for limiting the first rated speed detecting mechanism is arranged, so that the first rated speed detecting mechanism can be controlled to be not operated, and the first rated speed detecting mechanism and the second rated speed detecting mechanism can be truly realized to be respectively and independently operated without mutual influence, and an elevator system capable of matching the two rated speeds is realized; the speed of the elevator can be greatly improved, energy is saved, the construction cost is greatly reduced, and the development of the double-rated-speed elevator is facilitated.

Drawings

FIG. 1 is a schematic overall structure of a first embodiment of the present invention;

FIG. 2 is a schematic view of a stop mechanism according to an embodiment of the present invention;

FIG. 3 is a schematic view of a portion of the device according to an embodiment of the present invention with the stop structure omitted;

Fig. 4 is a schematic view of a part of the structure of the device of the second embodiment of the present invention, in which the stop structure is omitted.

The reference numerals in the drawings are:

1. A rope pulley; 100. a switch connecting rod; 101. a latch hook; 102. locking; 21. a first centrifugal motion structure; 22. a second centrifugal motion structure; 23. a first elastic structure; 24. a second elastic structure; 25. a third centrifugal motion structure; 26. a linkage rod; 27. a third spring structure; 3. a stop mechanism; 31. an iron core; 311. an extension piece; 32. a coil.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

It should be understood that the step numbers used herein are for convenience of description only and are not limiting as to the order in which the steps are performed.

It is to be understood that the terminology used in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

The terms "comprises" and "comprising" indicate the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.

The term "and/or" refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.

Embodiment one:

referring to fig. 1, the present embodiment provides an elevator speed limiting device capable of switching two rated speeds at any time, including:

a rated speed detecting mechanism and a stopping mechanism 3 provided on the sheave 1; the rope pulley 1 is fixed at the top of a well through a bracket and matched with a speed limiter rope of an elevator, one end of the rope is connected with one end of a car, the other end of the rope is connected to the other end of the car after being wound on the rope pulley 1 and the rope pulley rises, the rope pulley 1 synchronously rotates along with the up-and-down movement of the car, the faster the movement speed of the car is, the faster the rotation speed of the rope pulley 1 is, the slower the movement speed of the car is, and the rotation speed of the rope pulley 1 is the slower.

The rated speed detection mechanism comprises a centrifugal motion component and an elastic component, wherein the centrifugal motion component is rotationally connected with the rope pulley 1 through a rotating shaft, the centrifugal motion component performs centrifugal motion along with the rotation of the rope pulley 1, one end of the elastic component is movably connected with one end of the centrifugal motion component, the other end of the elastic component is movably connected to the rope pulley 1, and the elastic component is used for adjusting pressure applied to the centrifugal motion component, and the pressure is opposite to the centrifugal force generated by the centrifugal motion of the centrifugal motion component.

When the rotating speed of the rope wheel 1 reaches a certain speed, the pressure exerted by the elastic component on the centrifugal motion component is smaller than the centrifugal force generated by the rotation of the centrifugal motion component, one end of the centrifugal motion component, which is far away from the elastic component, rotates outwards, until the rotating speed of the rope wheel 1 exceeds the set rated speed, the end of the centrifugal motion component is driven to a switch connecting rod 100, the switch connecting rod 100 is connected with a switch, the switch connecting rod 100 is triggered to turn off a switch, and the switch can control the elevator to stop; if the car runs at a speed higher than the set rated speed after touching the switch connecting rod 100, one end of the centrifugal moving part far away from the elastic part continuously rotates outwards to touch the lock hook 101 of the rope braking device, and when the centrifugal moving part touches the lock hook 101, the lock catch 102 of the rope braking device is unhooked, so that the clamp block of the rope braking device clamps the rope under the action of gravity, the car safety tongs are lifted, and the car is stopped.

The stop mechanism 3 is arranged on the support of the rope pulley 1 and is electrically connected with the elevator controller, and the stop mechanism 3 acts according to instructions sent by the elevator controller and is used for limiting the movement of the centrifugal movement component;

The rated speed detecting mechanism is used for detecting the rated speed of one elevator car operation when the stopping mechanism 3 is operated, and is used for detecting the rated speed of the other elevator car operation when the stopping mechanism 3 is not operated; that is, the rated speed detecting means detects two kinds of rated speeds, respectively, which are different, when the stopper means 3 is operated and not operated; when the stop mechanism 3 is operated and not operated, the rated speed detection mechanism works under different working conditions respectively, and the two working conditions work independently.

Based on the above embodiment, the embodiment can realize the adaptation of the elevator system with two rated speeds, and the specific method is as follows:

When the elevator is required to run at a rated speed, the stop mechanism 3 is enabled to act through an instruction sent by the elevator controller, and when the speed of the elevator car exceeds the first rated speed, the rated speed detection mechanism is enabled to be effective, so that the elevator car is stopped;

when the elevator is required to run at another rated speed, the stop mechanism 3 is not actuated by an instruction sent by the elevator controller, and the centrifugal motion part is limited after the stop mechanism 3 is actuated, so that the rated speed detection mechanism can be effective to stop the elevator when the elevator speed exceeds the other rated speed;

By this method an elevator system adapting to double rated speeds can be achieved.

As a preferred embodiment of the present embodiment, the elastic member may be an elastic structure having elasticity and restoring force, such as a spring, an elastic string, or the like.

Referring specifically to fig. 2, as a preferred implementation of the present example, the centrifugal motion component is made of metallic iron, such as iron;

the stop mechanism 3 includes a core 31, an extension piece 311, and a coil 32;

The iron core 31 is arranged on the rotating shaft of the rope pulley 1 and rotates along with the rope pulley 1;

the coil 32 is fixed in front of the rope pulley 1 through a bracket of the rope pulley 1 and sleeved outside the iron core 31; the sheathing means is merely a sheathing on the outside of the core 31, and the coil 32 is not fixed to the core 31 and does not move along with the core 31.

The coil 32 is electrically connected with the elevator controller, and the elevator controller controls the coil 32 to be powered on or powered off, so that the coil 32 is powered on to generate an electromagnetic field, the iron core 31 generates magnetic force, and the iron core 31 loses the magnetic force when the coil 32 is powered off;

The main body of the centrifugal movement component does not interfere with the iron core 31, an extension piece 311 made of metal iron is arranged on the centrifugal movement component, one end of the extension piece 311 is fixedly connected with the centrifugal movement component, and the other end extends to the range of the outline of the iron core 31 and is matched with the iron core 31; that is, the body of the centrifugal motion part does not move within the outline of the iron core 31 in any state, and one end of the extension piece 311 away from the centrifugal motion part extends within the outline of the iron core 31, so that the extension piece 311 is sucked when the iron core 31 generates a magnetic force, thereby restricting the movement of the centrifugal motion part by the extension piece 311.

Referring specifically to fig. 3, in one implementation of the present embodiment, the centrifugal motion component includes a first centrifugal motion structure 21 and a second centrifugal motion structure 22; the first centrifugal motion structure 21 and the second centrifugal motion structure 22 can be centrifugal motion structures of common elevator speed limiters such as a throwing block, a throwing piece, a flyweight and the like;

The middle part of the first centrifugal motion structure 21 is rotationally connected with a point a1 on the left side of the rope pulley 1 through a rotating shaft, and the middle part of the second centrifugal motion structure 22 is rotationally connected with a point a2 on the right side of the rope pulley 1 through a rotating shaft;

the elastic member includes a first elastic structure 23 and a second elastic structure 24;

one end of the first elastic structure 23 is movably connected with a point b1 at the tail part of the first centrifugal motion structure 21, the other end of the first elastic structure 23 is movably connected with a point c1 at the lower side of the rope pulley 1, and the first elastic structure 23 is used for adjusting the pressure applied to the point b1 at the tail part of the first centrifugal motion structure 21; the first centrifugal motion structure 21 makes centrifugal motion along with the rotation of the rope pulley 1; when the rotation speed of the rope pulley 1 reaches a certain speed, the centrifugal force generated on the first centrifugal movement structure 21 is larger than the pressure applied by the first elastic structure 23, so that the first centrifugal movement structure 21 rotates towards the outline of the rope pulley 1 by taking the point a1 as a fulcrum to strike the switch connecting rod 100 or the lock hook 101.

One end of the second elastic structure 24 is movably connected with a point b2 at the tail part of the second centrifugal motion structure 22, the other end of the second elastic structure is movably connected with a point c2 at the upper side of the rope pulley 1, and the second elastic structure 24 is used for adjusting the pressure applied to the point b2 at the tail part of the second centrifugal motion structure 22; the second centrifugal motion structure 22 performs centrifugal motion along with the rotation of the rope pulley 1; the second centrifugal motion structure 22 and the second elastic structure 24 have the same operation principle as the first centrifugal motion structure 21 and the first elastic structure 23 described above, and are not described herein.

The first centrifugal movement structure 21 and the first elastic structure 23 form a first rated speed detection assembly, the second centrifugal movement structure 22 and the second elastic structure 24 form a second rated speed detection assembly, and the two rated speed detection assemblies are arranged in the rope pulley 1 in a mirror image mode by taking the center of the rope pulley 1 as a midpoint; the pressure applied to the end part of the first centrifugal movement structure 21 is regulated through the first elastic structure 23, when the first rated speed is exceeded, the centrifugal force generated by the first centrifugal movement structure 21 can cause the first centrifugal movement structure 21 to strike the switch connecting rod 100, and when the first rated speed is further exceeded, the centrifugal force generated by the first centrifugal movement structure 21 can cause the first centrifugal movement structure 21 to strike the lock hook 101, so that the first rated speed detected by the first rated speed detecting component can be regulated through regulating the first elastic structure 23, and the pretightening force of the spring is regulated through a nut; similarly, by adjusting the pressure applied to the end of the second centrifugal motion structure 22 by the second spring structure 24, the second rated speed detected by the second rated speed detecting assembly can be adjusted, and the second rated speed is greater than the first rated speed.

In this embodiment, the extension piece 311 is only disposed on the side of the first centrifugal movement structure 21, the extension piece 311 is not disposed on the second centrifugal movement structure 22, and since the iron core 31 and the coil 32 form an electromagnet, when the elevator controller controls the coil 32 to be powered on, the iron core 31 generates a magnetic force, so that the extension piece 311 made of metal iron can be adsorbed, and when one end of the first centrifugal movement structure 21 has a pressure, a magnetic force is added, so that the resultant force generated by the first centrifugal movement structure 21, the magnetic force and the pulling force is limited, and the resultant force generated by the magnetic force and the pulling force is larger than the centrifugal force generated by the first centrifugal movement structure 21 when the car reaches the second rated speed, so that the first centrifugal movement structure 21 can be kept in a stationary state all the time and cannot rotate.

Based on this embodiment, when the coil 32 is powered on, the first centrifugal motion structure 21 is limited to move, the second centrifugal motion structure 22 can move normally, and when the speed of the car exceeds the second rated speed, the second centrifugal motion structure 22 can strike the switch connecting rod 100 or the latch hook 101 to stop the car, so that the rated speed detection mechanism only detects the second rated speed when the coil 32 is powered on; when the coil 32 is powered off, the first centrifugal movement structure 21 can normally move, when the first rated speed is exceeded, the first centrifugal movement structure 21 can strike the switch connecting rod 100 or the lock hook 101 to stop the car, and the speed of the car cannot be increased to the second rated speed, so that the rated speed detection mechanism only detects the first rated speed when the coil 32 is powered off.

In another implementation manner of this embodiment, the stopping mechanism 3 may also be an electric push rod electrically connected to the elevator controller, where the fixed end of the electric push rod is fixed on the rope sheave 1 through a bracket, and the position of the electric push rod is located between one end of the first centrifugal motion structure 21 far away from the first elastic structure 23 and the inner wall of the rope sheave 1, and the telescopic end of the electric push rod faces the first centrifugal motion structure 21; when the elevator controller controls the electric push rod to run, the telescopic end of the electric push rod stretches out and is blocked between the first centrifugal movement structure 21 and the rope pulley 1, so that the first centrifugal movement structure 21 is limited to continuously rotate and be driven to the switch connecting rod 100 or the lock hook 101; in this embodiment, it is also possible to control the rated speed detecting means to detect two kinds of rated speeds.

As a preferred implementation of this embodiment, two ends of the coil 32 are connected in parallel to an RC series circuit. When the car is required to be switched from the high-speed second rated speed to the first rated speed, the car speed does not change from Ma Congdi to the first rated speed, so that if the car is still in a speed higher than the first rated speed when the rated speed is switched, the first rated speed detection component can be erroneously detected.

Embodiment two:

Referring specifically to fig. 4, the present embodiment differs from the first embodiment in that the centrifugal motion part includes a pair of third centrifugal motion structures 25 and a link lever 26; the two third centrifugal movement structures 25 are arranged in the rope pulley 1 in a mirror image mode by taking the center of the rope pulley 1 as a midpoint, two ends of the linkage rod 26 are respectively connected with the two third centrifugal movement structures 25, and the two third centrifugal movement structures 25 synchronously move through the linkage rod 26;

the elastic member includes a third elastic structure 27; one end of the third elastic structure 27 is movably connected with one end of one of the third centrifugal movement structures 25, the other end of the third elastic structure 27 is movably connected to the rope pulley 1, and the third elastic structure 27 is used for adjusting the pressure applied by the end of the corresponding third centrifugal movement structure 25;

When the stop mechanism 3 does not act, the two third centrifugal movement structures 25 and the third elastic structure 27 form a first rated speed detection assembly for detecting a first rated speed;

When the stop mechanism 3 acts, a control force is applied to the two third centrifugal movement structures 25 or one of the third centrifugal movement structures 25, and a second rated speed detection assembly is formed by the two third centrifugal movement structures 25 and the third elastic structure 27 and is used for detecting a second rated speed; the second rated speed is greater than the first rated speed.

In the present embodiment, the iron core 31, the extension piece 311, and the coil 32 are used as the stopper mechanism 3 as well, and the difference from the first embodiment is that the extension piece 311 may be provided on the side surface of one of the third centrifugal motion structures 25, the extension piece 311 may be provided on the side surface of the other third centrifugal motion structure 25, or the extension piece 311 may be provided on the side surfaces of both of the third centrifugal motion structures 25.

Based on this embodiment, since the two third centrifugal-motion structures 25 are managed by the link lever 26 and move synchronously, both the two third centrifugal-motion structures 25 are restricted from moving, and the voltage across the coil 32 or the size of the area of the extension piece 311 extending to the contour of the iron core 31 on the side of any one of the third centrifugal-motion structures 25 is preset, so that when only the third elastic structure 27 applies pressure to the third centrifugal-motion structure 25, the third centrifugal-motion structure 25 hits the switch link 100 or the latch hook 101 to stop the car when the first rated speed is exceeded; if the coil 32 is powered on, the iron core 31 generates a certain magnetic force on the extension piece 311 and the pressure exerted by the third elastic structure 27 acts on the third centrifugal movement structure 25 at the same time, and when the second rated speed is exceeded, the third centrifugal movement structure 25 can strike the switch connecting rod 100 or the lock hook 101 to stop the car; thereby realizing that the rated speed detecting mechanism only detects the first rated speed when the coil 32 is deenergized; the rated speed detecting mechanism detects only the second rated speed when the coil 32 is energized.

Based on the first embodiment and the second embodiment, the present invention can also implement setting more rated speed detecting mechanisms to match with an elevator system with more rated speeds, for example, three rated speeds and four rated speeds, and only the rated speed detecting mechanisms are required to be added according to the principle described in the foregoing embodiment, and further, a speed limiting device with two rated speeds can also be implemented.

Embodiment III:

the embodiment provides an elevator speed-increasing method, which is realized based on the elevator speed-limiting device capable of switching two rated speeds at any time according to any embodiment of the invention, and comprises the following steps:

Dividing the top and bottom regions of the hoistway into first rated speed regions;

When the elevator goes up, detecting whether the weight of the elevator car is less than or equal to the weight of the balancing weight; when the weight of the lift car is smaller than or equal to the weight of the balancing weight, the lift controller controls to send a command to the stop mechanism 3, so that the stop mechanism 3 is switched to detect the second rated speed, and meanwhile, the lift controller controls the lift car to run at the second rated speed; when the elevator ascends to a first rated speed area at the top of the hoistway, the elevator controller controls to send a command to the stop mechanism 3, so that the stop mechanism 3 is switched to detect the first rated speed, and meanwhile, the elevator controller controls the elevator car to run at the first rated speed;

When the elevator descends, detecting whether the weight of the elevator car is more than or equal to the weight of the balancing weight; when the weight of the lift car is greater than or equal to that of the balancing weight, the lift controller controls to send a command to the stop mechanism 3, so that the stop mechanism 3 is switched to detect the second rated speed, and meanwhile, the lift controller controls the lift car to run at the second rated speed; when the elevator descends to a first rated speed area at the bottom of the hoistway, the elevator controller controls to send a command to the stopping mechanism 3, so that the stopping mechanism 3 is switched to detect the first rated speed, and meanwhile, the elevator controller controls the car to run at the first rated speed.

In the embodiments of the present application, "at least one" means one or more, and "a plurality" means two or more. "and/or", describes an association relation of association objects, and indicates that there may be three kinds of relations, for example, a and/or B, and may indicate that a alone exists, a and B together, and B alone exists. Wherein A, B may be singular or plural. The character "/" generally indicates that the context-dependent object is an "or" relationship. "at least one of the following" and the like means any combination of these items, including any combination of single or plural items. For example, at least one of a, b and c may represent: a, b, c, a and b, a and c, b and c or a and b and c, wherein a, b and c can be single or multiple.

The foregoing description is only illustrative of the present invention and is not intended to limit the scope of the invention, and all equivalent structures or equivalent processes or direct or indirect application in other related technical fields are included in the scope of the present invention.

Claims (5)

1. An elevator speed limiting device capable of switching two rated speeds at any time, which is characterized by comprising:

a rated speed detecting mechanism and a stopping mechanism (3) arranged on the rope wheel (1);

the rated speed detection mechanism comprises a centrifugal motion component and an elastic component, wherein the centrifugal motion component is rotationally connected with the rope pulley (1) through a rotating shaft, the centrifugal motion component performs centrifugal motion along with the rotation of the rope pulley (1), one end of the elastic component is movably connected with one end of the centrifugal motion component, the other end of the elastic component is movably connected with the rope pulley (1), and the elastic component is used for adjusting pressure applied to the centrifugal motion component, and the pressure is opposite to the centrifugal force generated by the centrifugal motion of the centrifugal motion component;

the stop mechanism (3) is arranged on a bracket of the rope wheel (1) and is electrically connected with the elevator controller, and the stop mechanism (3) acts according to instructions sent by the elevator controller and is used for limiting the movement of the centrifugal movement component;

The rated speed detection mechanism is used for detecting the rated speed of one elevator car operation when the stop mechanism (3) is operated, and is used for detecting the rated speed of the other elevator car operation when the stop mechanism (3) is not operated;

the stop mechanism (3) comprises an iron core (31), an extension piece (311) and a coil (32);

the iron core (31) is arranged on the rotating shaft of the rope pulley (1) and rotates along with the rope pulley (1);

The coil (32) is fixed in front of the rope pulley (1) through a bracket of the rope pulley (1) and sleeved outside the iron core (31);

The coil (32) is electrically connected with the elevator controller, and the coil (32) is controlled to be powered on or powered off by the elevator controller;

The main body of the centrifugal motion component is not interfered with the iron core (31), an extension piece (311) made of metal iron is arranged on the centrifugal motion component, one end of the extension piece (311) is fixedly connected with the centrifugal motion component, and the other end of the extension piece extends to the range of the end face of the iron core (31) facing the rope wheel (1) and is matched with the iron core (31) for sucking and releasing.

2. Elevator speed limiter with changeable two rated speeds according to claim 1, characterized in that:

an RC series circuit is connected in parallel with the two ends of the coil (32).

3. Elevator speed limiter with changeable two rated speeds according to claim 1, characterized in that:

the centrifugal motion component comprises a first centrifugal motion structure (21) and a second centrifugal motion structure (22);

the elastic component comprises a first elastic structure (23) and a second elastic structure (24);

one end of the first elastic structure (23) is movably connected with one end of the first centrifugal motion structure (21), the other end of the first elastic structure is movably connected to the rope pulley (1), and the first elastic structure (23) is used for adjusting pressure applied to the end part of the first centrifugal motion structure (21); the first centrifugal motion structure (21) performs centrifugal motion along with the rotation of the rope wheel (1);

One end of the second elastic structure (24) is movably connected with one end of the second centrifugal motion structure (22), the other end of the second elastic structure is movably connected to the rope pulley (1), and the second elastic structure (24) is used for adjusting pressure applied to the end part of the second centrifugal motion structure (22); the second centrifugal movement structure (22) makes centrifugal movement along with the rotation of the rope wheel (1);

The first centrifugal movement structure (21) and the first elastic structure (23) form a first rated speed detection assembly, the second centrifugal movement structure (22) and the second elastic structure (24) form a second rated speed detection assembly, and the two rated speed detection assemblies are arranged in the rope pulley (1) in a mirror image mode by taking the center of the rope pulley (1) as a midpoint;

The first rated speed detection component is used for detecting the first rated speed by adjusting the first elastic structure (23), the second rated speed detection component is used for detecting the second rated speed by adjusting the second elastic structure (24), and the second rated speed is larger than the first rated speed;

When the stop mechanism (3) acts, a control force is applied to the first centrifugal movement structure (21), and the resultant force of the control force and the pressure applied by the first elastic structure (23) to the end part of the first centrifugal movement structure (21) is larger than the centrifugal force generated on the first centrifugal movement structure (21) when the rope wheel (1) reaches the second rated speed.

4. Elevator speed limiter with changeable two rated speeds according to claim 1, characterized in that:

the centrifugal motion component comprises a pair of third centrifugal motion structures (25) and a linkage rod (26); the two third centrifugal movement structures (25) are arranged in the rope pulley (1) in a mirror image mode by taking the center of the rope pulley (1) as a midpoint, two ends of the linkage rod (26) are respectively connected with the two third centrifugal movement structures (25), and the two third centrifugal movement structures (25) synchronously move through the linkage rod (26);

The elastic component comprises a third elastic structure (27); one end of the third elastic structure (27) is movably connected with one end of one third centrifugal motion structure (25), the other end of the third elastic structure is movably connected to the rope pulley (1), and the third elastic structure (27) is used for adjusting pressure applied to the end part of the corresponding third centrifugal motion structure (25);

When the stop mechanism (3) does not act, the two third centrifugal movement structures (25) and the third elastic structure (27) form a first rated speed detection assembly for detecting the first rated speed;

When the stop mechanism (3) acts, a control force is applied to the two third centrifugal movement structures (25) or one of the third centrifugal movement structures (25), and a second rated speed detection assembly is formed by the two third centrifugal movement structures (25) and the third elastic structure (27) and is used for detecting a second rated speed; the second rated speed is greater than the first rated speed.

5. Elevator speed-raising method based on an elevator speed-limiting device capable of switching between two rated speeds at any time according to any one of claims 1-4, characterized in that the method comprises the following steps:

Dividing the top and bottom regions of the hoistway into first rated speed regions;

When the elevator goes up, detecting whether the weight of the elevator car is less than or equal to the weight of the balancing weight; when the weight of the lift car is smaller than or equal to the weight of the balancing weight, the lift controller controls to send a command to the stop mechanism (3), so that the stop mechanism (3) is switched to detect the second rated speed, and meanwhile, the lift controller controls the lift car to run at the second rated speed; when the elevator ascends to a first rated speed area at the top of the hoistway, the elevator controller controls to send a command to the stop mechanism (3) so that the stop mechanism (3) is switched to detect the first rated speed, and meanwhile, the elevator controller controls the car to run at the first rated speed;

When the elevator descends, detecting whether the weight of the elevator car is more than or equal to the weight of the balancing weight; when the weight of the lift car is greater than or equal to that of the balancing weight, the lift controller controls to send a command to the stop mechanism (3), so that the stop mechanism (3) is switched to detect the second rated speed, and meanwhile, the lift controller controls the lift car to run at the second rated speed; when the elevator descends to a first rated speed area at the bottom of the well, the elevator controller controls to send a command to the stopping mechanism (3) so that the stopping mechanism (3) is switched to detect the first rated speed, and meanwhile, the elevator controller controls the car to run at the first rated speed.