Patent Description:
With the constant acceleration of urbanization in China, more and more high-rise buildings are equipped with elevators, which makes the safety of the elevators closely related to people's life. Traditional elevator safety gears are driven by mechanical governors. With the development of the functional electronic safety technique, electronic governors gradually show better functions and performance, but electric safety gears matched with the electronic governors still remain imperfect.

Most existing electric safety gears reset based on the electromagnet technique, which, as is known to all, is typically used in a small spacing that is generally less than <NUM>; once the spacing or the travel distance increases, the magnetic force of electromagnets will be reduced exponentially, and the effect becomes lower and lower, which greatly limits the application scenarios of the electromagnets and affects the safety coefficient of the elevators.

Common electromagnets generate a magnetic field by means of currents and then generate a magnetic attraction force by means of the magnetic field or magnetized ferromagnetic materials and ferromagnetic materials, but the magnetic attraction force is unidirectional rather than bidirectional. In addition, because the magnetic attraction force is not in direct proportion with the distance, it is very difficult to control the torque when the common electromagnets work, and the stability is poor.

<CIT> relates to an electromagnetic actuator for an electric switching apparatus comprising a magnetised assembly, an excitation coil through which an electric control current can flow, the coil and the magnetised assembly being movable relative to each other. <CIT> relates to an electromagnetic actuator with a magnetically active core comprising two longitudinal bars arranged parallel to one another and two control coils displaceably arranged thereon. <CIT> relates to a method for controlling an elevator.

The objective of the invention is to overcome the defects of the prior art by providing a linear driving apparatus, a safety gear apparatus and a method for controlling an elevator system to solve the problems of long travel distance and large torque for driving required when electric safety gears reset and to realize good torque stability.

The technical solution of the invention is as follows:
A linear driving apparatus comprises a magnetically conductive device and a magnet, wherein the magnetically conductive device comprises at least a first side portion and a second side portion, and is provided with an enclosed magnetic cavity; the magnet is located between the first side portion and the second side portion and comprises at least a first end and a second end, magnetic pole directions of the first end and the second end are opposite, the first end corresponds to the first side portion, and the second end corresponds to the second side portion; the magnetically conductive device is provided with a winding coil, and in the magnetic cavity, the winding direction of the winding coil is perpendicular to the direction from the first end to the second end of the magnet; and the magnetically conductive device movably fits the magnet.

The magnetically conductive device comprises a first magnetically conductive mechanism, a second magnetically conductive mechanism, a first joint and a second joint, wherein the first magnetically conductive mechanism and the second magnetically conductive mechanism are connected through the first joint and the second joint to form the magnetic cavity, and one side of the winding coil penetrates through the magnetic cavity.

Two winding coils are arranged on the first magnetically conductive mechanism and the second magnetically conductive mechanism, respectively.

The magnet comprises a connecting plate which penetrates through the first joint or the second joint.

The magnetically conductive device comprises a guide sleeve which is arranged on at least one of the first joint and the second joint, and the connecting plate slides on the guide sleeve.

A connecting rod is connected to the connecting plate and is located on the outer side of the first j oint or the second joint.

A linear driving apparatus comprises a magnetically conductive device and a coil device, wherein the magnetically conductive device comprises at least a first side portion and a second side portion. The linear driving apparatus further comprises a magnet, wherein the magnet is located between the first side portion and the second side portion and defines a magnetic cavity together with the magnetically conductive device; the magnet comprises at least a first end and a second end, and the first end and the second end are opposite in direction; the first end corresponds to the first side portion, and the second end corresponds to the second side portion; the coil device comprises at least a bobbin and a winding coil; the winding coil is wound around the bobbin, and in the magnetic cavity, at least one part of a tangent line in the winding direction of the winding coil is perpendicular to the direction from the first end to the second end of the magnet; and the coil device is connected to the magnetically conductive device through a mechanical slide rail.

The bobbin comprises a first end portion, a second end portion and a connecting plate, wherein the first end and the second end are located at two ends of the connecting plate, and the connecting plate is located outside a second magnetically conductive mechanism.

Guide slots which are concaved inwards are formed in the first end portion and the second end portion, slide rails which protrude outwards are arranged on two sides of the second magnetically conductive mechanism, the guide slots are matched with the slide rails, and a mechanical guide mechanism in the moving direction of the linear driving apparatus is formed at least by the guide slots and the slide rails.

A connecting mechanism is arranged on the connecting plate, and a connecting rod is fixedly mounted on the connecting mechanism and is located on the outer side of the second magnetically conductive mechanism.

The magnetizing direction of the magnet is the connecting direction from the first end to the second end of the magnet, and the first end of the magnet is a source pole or a north pole of a magnetic field.

The magnetically conductive mechanism and the magnetic are identical in thickness, and the magnetizing intensity of the magnet on the same horizontal plane is constant.

A safety gear apparatus comprises any one linear driving apparatus mentioned above, a spring device, a safety gear body and a tie bar, wherein the spring device comprises an upper baffle, a spring mechanism and a lower baffle, the upper baffle and the lower baffle are arranged at two ends of the spring mechanism, and the positions of the lower baffle and the safety gear body are fixed; the safety gear body comprises a safety gear frame, in which a guide block device, a safety gear wedge and a fixing mechanism are arranged, the guide block device has a first sloping edge, the safety gear wedge has a second sloping edge with an angle corresponding to that of the first sloping edge, the second sloping edge slidably fits the first sloping edge, the fixing mechanism is located on the bottom surface of the safety gear wedge, and the tie bar has an end connected to the linear driving device and penetrating through the spring device as well as an end connected to the fixing mechanism.

An elevator system comprises a control system, an elevator car, guide rails, and the safety gear apparatus according to Claim <NUM>, wherein the control system is electrically connected to the winding coil, the safety gear apparatuses are arranged on two sides of the elevator car and fit and correspond to the guide rails on the two sides of the elevator car, and the safety gear wedges of the safety gear devices fit the guide rails.

A method for controlling an elevator comprises the following steps:.

The advantages or principle of the invention will be explained as follows:.

To more clearly explain the technical solutions of the embodiments of the invention, drawings of the embodiments will be briefly introduced below. Obviously, the drawings in the following description only relate to some embodiments of the invention, and are not intended to limit the invention.

<NUM>, magnetically conductive device; <NUM>, first side portion; <NUM>, second side portion; <NUM>, first magnetically conductive mechanism; <NUM>, second magnetically conductive mechanism; <NUM>, first joint; <NUM>, second joint; <NUM>, slide rail; <NUM>, sliding mechanism; <NUM>, guide sleeve; <NUM>, coil device; <NUM>, bobbin; <NUM>, first end portion; <NUM>, second end portion; <NUM>, guide slot; <NUM>, connecting plate; <NUM>, connecting rod; <NUM>, winding coil; <NUM>, magnet; <NUM>, first end; <NUM>, second end; <NUM>, magnetic cavity; <NUM>, safety gear apparatus; <NUM>, spring device; <NUM>, upper baffle; <NUM>, lower baffle; <NUM>, spring mechanism; <NUM>, safety gear body; <NUM>, safety gear frame; <NUM>, guide block device; <NUM>, safety gear wedge; <NUM>, fixing mechanism; <NUM>, first sloping edge; <NUM>, second sloping edge; <NUM>, tie bar; <NUM>, elevator car.

The embodiments of the invention will be described in detail below.

As shown in <FIG>, a linear driving apparatus comprises a magnetically conductive device <NUM> and a magnet <NUM>, wherein the magnetically conductive device <NUM> comprises at least one a first side portion <NUM> and a second side portion <NUM>, and is provided with an enclosed magnetic cavity <NUM>; the magnet <NUM> is located between the first side portion <NUM> and the second side portion <NUM> and comprises at least a first end <NUM> and a second end <NUM>, magnetic pole directions of the first end <NUM> and the second end <NUM> are opposite, the first end <NUM> corresponds to the first side portion <NUM>, and the second end <NUM> corresponds to the second side portion <NUM>; the magnetically conductive device <NUM> is provided with a winding coil <NUM>, and in the magnetic cavity <NUM>, the winding direction of the winding coil <NUM> is perpendicular to the direction from the first end <NUM> to the second end <NUM> of the magnet <NUM>; and the magnetically conductive device <NUM> movably fits the magnet <NUM>. Wherein, in this embodiment, the first end <NUM> and the second end <NUM> are close to the winding coil <NUM>.

As shown in <FIG> and <FIG>, the magnetically conductive device <NUM> comprises a first magnetically conductive mechanism <NUM>, a second magnetically conductive mechanism <NUM>, a first joint <NUM> and a second joint <NUM>, wherein the first magnetically conductive mechanism <NUM> and the second magnetically conductive mechanism <NUM> are connected through the first joint <NUM> and the second joint <NUM> to form the magnetic cavity <NUM>, and one side of the winding coil <NUM> penetrates through the magnetic cavity <NUM>. Two winding coils <NUM> are arranged on the first magnetically conductive mechanism <NUM> and the second magnetically conductive mechanism <NUM>, respectively. The magnet <NUM> comprises a connecting plate <NUM> which penetrates through the first joint <NUM> or the second joint <NUM>. The magnetically conductive device <NUM> comprises a guide sleeve <NUM> which is arranged on at least one of the first joint <NUM> and the second joint <NUM>, and the connecting plate <NUM> slides on the guide sleeve <NUM>.

As shown in <FIG>, a connecting rod <NUM> is connected to the connecting plate <NUM> and is located on the outer side of the first j oint <NUM> or the second joint <NUM>.

As shown in <FIG>, a safety gear apparatus <NUM> comprises a linear driving apparatus, a spring device <NUM>, a safety gear body <NUM> and a tie bar <NUM>, wherein the spring device <NUM> comprises an upper baffle <NUM>, a spring mechanism <NUM> and a lower baffle <NUM>, the upper baffle <NUM> and the lower baffle <NUM> are arranged at two ends of the spring mechanism <NUM>, and the positions of the lower baffle <NUM> and the safety gear body <NUM> are fixed; the safety gear body <NUM> comprises a safety gear frame <NUM> in which a guide block device <NUM>, a safety gear wedge <NUM> and a fixing mechanism <NUM> are arranged, the guide block device <NUM> has a first sloping edge <NUM>, the safety gear wedge <NUM> has a second sloping edge <NUM> with an angle corresponding to that of the first sloping edge <NUM>, the second sloping edge <NUM> slidably fits the first sloping edge <NUM>, the fixing mechanism <NUM> is located on the bottom surface of the safety gear wedge <NUM>, one end of the tie bar <NUM> is connected to the linear driving apparatus and penetrates through the spring device <NUM>, and the other end of the tie bar <NUM> is connected to the fixing mechanism <NUM>.

As shown in <FIG>, an elevator system comprises a control system, an elevator car <NUM>, guide rails and safety gear apparatuses <NUM>, wherein the control system is electrically connected to a winding coil <NUM>, the safety gear apparatuses <NUM> are disposed on two sides of the elevator car <NUM> and fit and correspond to the guide rails on the two sides of the elevator car <NUM> respectively, and safety gear wedges <NUM> of the safety gear apparatuses <NUM> fit the guide rails.

A method for controlling an elevator comprises the following steps: when an elevator runs normally, the linear driving apparatus is powered on to press the magnet <NUM> and the connecting plate <NUM> downwards under the electric relation so as to compress the spring devices <NUM> to make the safety gear apparatuses <NUM> in a reset and standby state, that is, the safety gear wedges <NUM> are stretched, and then, the elevator car <NUM> moves vertically freely; the elevator system detects the running speed of the elevator car <NUM>; when the actual running speed of the elevator car <NUM> exceeds a preset maximum running speed or the elevator car <NUM> runs to an abnormal position of a hoistway, such as the end of the hoistway, the control system powers off the winding coil <NUM> to enable the linear driving device to withdraw the downward pushing force; and the safety gear apparatuses <NUM> push the tie bar <NUM> upwards under the effect of a preset compression force from the spring devices <NUM>, and the tie bar <NUM> drives the safety gear wedges <NUM> to move and clamp the guide rails to stop the elevator car <NUM>, so that emergency braking of the elevator is realized.

This embodiment of the invention has the following advantages:.

As shown in <FIG>, a linear driving apparatus comprises a magnetically conductive device <NUM> and a coil device <NUM>, wherein the magnetically conductive device <NUM> comprises at least a first side portion <NUM> and a second side portion <NUM>. The linear driving apparatus further comprises a magnet <NUM> located between the first side portion <NUM> and the second side portion <NUM>, and a magnetic cavity <NUM> is defined by the magnetically conductive device <NUM> and the magnet <NUM>. The magnet <NUM> comprises at least a first end <NUM> and a second end <NUM>, wherein the first end <NUM> and the second end <NUM> are opposite in direction, the first end <NUM> corresponds to the first side portion <NUM>, and the second end <NUM> corresponds to the second side portion <NUM>. The coil device <NUM> comprises at least a bobbin <NUM> and a winding coil <NUM>, wherein the winding coil <NUM> is wound around the bobbin <NUM>, and in the magnetic cavity <NUM>, at least one part of a tangent line in the winding direction of the winding coil <NUM> is perpendicular to the direction from the first end <NUM> to the second end of the magnet <NUM>; and the coil device <NUM> is connected to the magnetically conductive device <NUM> through a mechanical slide rail <NUM>.

The bobbin <NUM> comprises a first end portion <NUM>, a second end portion <NUM> and a connecting plate <NUM>, wherein the first end portion <NUM> and the second end portion <NUM> are located at two ends of the connecting plate <NUM>, and the connecting plate <NUM> is located outside a second magnetically conductive mechanism <NUM>; a connecting mechanism is arranged on the connecting plate <NUM>, and a connecting rod <NUM> is fixedly mounted on the connecting mechanism and is located outside the second magnetically conductive mechanism <NUM>.

Guide slots <NUM> which are concaved inwards are formed in the first end portion <NUM> and the second end portion <NUM>, slide rails <NUM> which protrude outwards are arranged on two sides of the second magnetically conductive mechanism <NUM>, the guide slots <NUM> are matched with the sliding rails <NUM>, and a mechanical guide mechanism in the moving direction of the linear driving apparatus is formed by at least the guide slots <NUM> and the slide rails <NUM>.

The magnetizing direction of the magnet <NUM> is the connecting direction from the first end <NUM> to the second end <NUM> of the magnet <NUM>, and the first end <NUM> of the magnet <NUM> is a south pole or a north pole of a magnetic field; the magnetically conductive mechanisms and the magnet <NUM> are identical in thickness; the magnetizing intensity of the magnet <NUM> on the same horizontal plane is constant; the magnetically conductive device <NUM> comprises a first magnetically conductive mechanism <NUM> and the second magnetically conductive mechanism <NUM> which are connected through a first joint <NUM> and a second joint <NUM>, and one side of the winding coil <NUM> penetrates through the magnetic cavity <NUM>.

A method for controlling an elevator in this embodiment differs from the method in Embodiment <NUM> in that when the elevator runs normally, the winding coil <NUM> and the bobbin <NUM> are pressed downwards.

Claim 1:
A linear driving apparatus, comprising a magnetically conductive device (<NUM>) and a magnet (<NUM>), wherein the magnetically conductive device comprises at least a first side portion (<NUM>) and a second side portion (<NUM>) and is provided with an enclosed magnetic cavity (<NUM>), and the magnet (<NUM>) is located between the first side portion (<NUM>) and the second side portion (<NUM>);
the magnet (<NUM>) comprises at least a first end (<NUM>) and a second end (<NUM>), magnetic pole directions of the first end (<NUM>) and the second end (<NUM>) are opposite, the first end (<NUM>) corresponds to the first side portion (<NUM>), and the second end (<NUM>) corresponds to the second side portion (<NUM>);
the magnetically conductive device (<NUM>) is provided with a winding coil (<NUM>), and in the magnetic cavity (<NUM>), a winding direction of the winding coil is perpendicular to a direction from the first end (<NUM>) to the second end (<NUM>) of the magnet (<NUM>), characterized in that
the magnetically conductive device (<NUM>) movably fits the magnet (<NUM>), wherein the magnetically conductive device (<NUM>) comprises a first magnetically conductive mechanism (<NUM>), a second magnetically conductive mechanism (<NUM>), a first joint (<NUM>) and a second joint (<NUM>), the first magnetically conductive mechanism (<NUM>) and the second magnetically conductive mechanism (<NUM>) are connected through the first joint (<NUM>) and the second joint (<NUM>) to form the magnetic cavity (<NUM>), and one side of the winding coil (<NUM>) penetrates through the magnetic cavity (<NUM>).