CN217780457U

CN217780457U - Electromagnetic friction liner for friction type elevator

Info

Publication number: CN217780457U
Application number: CN202222069676.9U
Authority: CN
Inventors: 朱轩; 高俊福; 李浩宇; 袁群地
Original assignee: China ENFI Engineering Corp
Current assignee: China ENFI Engineering Corp
Priority date: 2022-08-08
Filing date: 2022-08-08
Publication date: 2022-11-11
Anticipated expiration: 2032-08-08

Abstract

The utility model discloses an electromagnetic friction liner for friction formula lifting machine, including a plurality of liner segmentations, the liner segmentation is the circular arc section, and a plurality of liner segmentation series connection are arranged and are cyclic annular and install on the outer circumference of lifting machine friction pulley, and each liner segmentation radially includes along the circular arc section: superstructure, superstructure's upper surface is equipped with the grooving, the grooving extends along the circumferencial direction of circular arc section, substructure, be connected with superstructure, substructure is the electro-magnet, lower surface at substructure is provided with pressure sensor, control circuit is connected with electro-magnet and pressure sensor, control circuit receives pressure sensor's pressure signal, send signal gives the electro-magnet, the circular telegram and the outage of control electro-magnet, the liner segmentation is circular telegram when enclosing within the angle scope, the outage when enclosing outside the angle scope. This application produces the appeal to wire rope through the electro-magnet in the friction lining and increases wire rope to the normal pressure of friction lining to improve the non-skid property between friction lining and the wire rope.

Description

Electromagnetic friction liner for friction type elevator

Technical Field

The utility model belongs to the technical field of friction formula lifting machine, it is concrete, relate to an electromagnetic friction liner for friction formula lifting machine.

Background

The friction type multi-rope hoist utilizes the static friction force between the friction lining and the steel wire rope to drive the steel wire rope to drag the hoisting container to lift. The friction lining is arranged on the circumference of the friction wheel of the multi-rope friction type hoister, and the upper surface of the friction lining is provided with a rope groove. The coefficient of friction and the compressive strength of the friction lining are directly related to the working capacity and safety of the hoisting machine. When the friction coefficient is insufficient under severe working conditions or in the acceleration and deceleration motion states of the friction lifting system, the sliding phenomenon easily occurs between the steel wire rope and the friction lining, and the safe operation of the lifting system is influenced.

In addition, the application range of the conventional multi-rope friction type hoister is limited, and the hoisting machine cannot be economically and effectively suitable for heavy-load shallow well hoisting. The reason is that when a heavy-load shallow well is lifted, the static tension difference of the steel wire ropes on the two sides of the friction wheel is too large, so that the steel wire ropes are easy to slide on the friction wheel. Generally, this problem can be solved by using a counterbalanced rope or a heavy lift vessel, but this results in a bulky lift system, which is costly and wasteful of energy. And through increasing the coefficient of friction between lifting machine friction liner and the wire rope, can effectively increase the lifting capacity of lifting machine, make the friction formula lifting machine of restricting more move safely high-efficiently under the shallow well lifting condition of heavy load. Therefore, the development of a friction liner with a higher friction coefficient is necessary for the safe operation of the vertical multi-rope friction type hoisting machine, and is vital for expanding the efficient application of the multi-rope friction type hoisting machine in heavy-load shallow shaft hoisting. The selection of the existing friction liner material is changed from polyvinyl chloride and polyurethane to a novel composite material, and the aim is to pursue a higher friction coefficient from the material per se so as to obtain a larger maximum static friction force. But the development of new gasket materials with higher coefficients of friction has progressed slowly.

Chinese patent CN210480520U proposes that two extrusion blocks are arranged on two sides of the pad, which can extrude the steel wire rope, so as to increase the contact area between the steel wire rope of the elevator and the pad to increase the friction force, so that the elevator has better stability during operation and higher load lifting efficiency. However, such friction pads have a complicated structure, a large amount of maintenance and repair, and poor reliability.

SUMMERY OF THE UTILITY MODEL

In order to solve the above problem, the utility model discloses an electromagnetic friction liner for friction formula lifting machine, including a plurality of liner segmentations, the liner segmentation is the circular arc section, and a plurality of liner segmentations are used for the series arrangement to be cyclic annular and install on the outer circumference of lifting machine friction pulley, and each liner segmentation radially includes along the circular arc section:

an upper structure, the upper surface of which is provided with a rope groove extending along the circumferential direction of the arc section,

a lower structure connected with the upper structure, the lower structure is an electromagnet, a pressure sensor is arranged on the lower surface of the lower structure,

the control circuit is connected with the electromagnet and the pressure sensor, receives a pressure signal of the pressure sensor, sends the signal to the electromagnet, controls the electrification and the outage of the electromagnet,

wherein the pad segments are energized when within the range of the wrap angle and de-energized when outside the range of the wrap angle,

one side of the liner segment is an inclined surface which gradually faces outwards from top to bottom, the other opposite side of the liner segment is a vertical plane, the liner segment is arranged on the outer circumference of the friction wheel by contacting the inclined surface through the pressing block and contacting the vertical plane through the fixing block.

Alternatively, the pad segments are annularly mounted on the outer circumference of the elevator pulley in an axially juxtaposed arrangement.

Optionally, the substructure has a thickness of 2/3 of the total thickness of the liner segments.

Optionally, the control circuit varies the attraction force of the electromagnet by varying the input current to the electromagnet, thereby adjusting the positive pressure of the wire rope on the liner segment.

Optionally, the curvature of the substructure is the same as the outer circumferential curvature of the elevator sheave.

Optionally, the rope groove is a double rope groove.

Optionally, the pressure sensor is embedded in a lower surface of the substructure.

Optionally, the control circuit is connected with the pressure sensor and the electromagnet in a wireless transmission mode.

The electromagnetic friction liner for the friction type lifter has the following beneficial effects:

(1) The method can obtain larger maximum static friction force (maximum friction force without slipping), increase the capacity and the operation safety of a lifting system, and expand the application range of the friction type lifter to shallow well lifting.

(2) Simple structure and safe and reliable use.

(3) When the electromagnetic friction liner is contacted with the steel wire rope, attraction is generated; when the steel wire rope is not in contact with the steel wire rope, the attraction disappears, the energy is saved, the consumption is reduced, and the normal operation of the steel wire rope is not influenced.

(4) The magnitude of the input current can be changed according to the requirement of a lifting system, the magnetic field intensity of the electromagnet is changed along with the input current, and the attraction force borne by the steel wire rope is changed so as to obtain the positive pressure and the maximum static friction force required by the design;

(5) The electromagnetic friction liner reaches the abrasion loss required by safety regulations, and only the upper structure of the electromagnetic friction liner needs to be replaced when the electromagnetic friction liner needs to be replaced, so that the cost is reduced.

Drawings

FIG. 1 is a cross-sectional view of an electromagnetic friction pad in accordance with an embodiment of the present invention;

FIG. 2 is a longitudinal cross-sectional view of an electromagnetic friction pad of an embodiment of the present invention;

FIG. 3 is a front view of an electromagnetic friction lining according to an embodiment of the present invention installed on a friction wheel of a hoist;

FIG. 4 is a side view of an electromagnetic friction lining according to an embodiment of the present invention installed on a friction wheel of a hoist;

FIG. 5 is an enlarged view at A of FIG. 3;

fig. 6 is an enlarged view of fig. 4 at B.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

The electromagnetic friction lining for the friction type elevator of the embodiment comprises a plurality of lining segments, wherein FIG. 1 is a cross-sectional view of the lining segments of the embodiment, and FIG. 2 is a longitudinal cross-sectional schematic view of the lining segments of the embodiment. As shown in fig. 1 and 2, the liner segment 1 of the present embodiment is a circular arc segment, and is composed of an upper structure 11 and a lower structure 12 along the radial direction of the circular arc segment, the upper surface of the upper structure 11 is provided with rope grooves 14, the rope grooves 14 extend along the circumferential direction of the circular arc segment, and preferably are parallel double rope grooves for contacting with the steel wire ropes. The upper structure of the lining segment is made of common composite materials, such as polyvinyl chloride, polyurethane rubber and resin materials.

The lower structure 12 is an electromagnet, and a pressure sensor 13 for detecting the pressure of the steel wire rope 200 against the pad segment is provided on the lower surface of the lower structure 12, and may be embedded in the lower surface of the lower structure.

The curvature of the lower structure 12 of the pad segment is the same as that of the outer circumference of the traction sheave of the hoist so as to be attached to the outer circumference of the traction sheave, and preferably, the entire pad segment is curved in the same form as that of the outer circumference of the friction sheave 100. A plurality of pad segments 1 can be arranged in series annularly around the outer circumference of the elevator sheave. It is also possible to arrange a plurality of rings in parallel in the axial direction around the outer circumference of the traction sheave of the hoisting machine as shown in fig. 3.

One side surface of the pad segment 1 is an inclined surface gradually outward from the top to the bottom so as to be in contact with the pressing block 21, by which the pad segment 1 is mounted on the outer circumference of the friction wheel so as to be restricted from radial play, and the opposite other side surface is a vertical plane for being in contact with the fixing block 22 at the time of mounting and restricted from axial play by the fixing block 22. The connection of the pressure block and the fixed block with the friction wheel can be through a bolt connection for example. It should be noted that the pressing block and the fixing block are common techniques for fixing the liner segment, and are not described in detail here. Moreover, the liner segments can also be arranged in the wedge-shaped groove on the outer circumference of the friction wheel in an interference connection mode.

The electromagnet is connected with the control circuit, the control circuit is connected with the pressure sensor, and wireless transmission is adopted for signal transmission between the pressure sensor and the control circuit and between the control circuit and the electromagnet. The control circuit receives a pressure signal of the pressure sensor, and the control circuit sends a signal to the electromagnet to control the electrification and the outage of the electromagnet.

The lower surface of the upper structure is tightly attached to the upper surface of the lower structure, and the upper structure and the lower structure can be integrally formed or can be installed and connected together in an assembling mode. Preferably, the upper structure and the lower structure are assembled into liner segments, and only the upper structure of the liner segments need to be replaced when the liner segments reach the amount of wear required by safety regulations. The upper structure and the lower structure can be embedded into the wedge-shaped groove of the friction wheel through interference fit, and when the upper structure needs to be detached and replaced, the upper structure is detached and replaced.

Preferably, the thickness of the substructure is about 2/3 of the total thickness of the liner segments.

Preferably, the pad segment 1 is powered on when inside the range of the enclosing angle and powered off when outside the range of the enclosing angle. The power-on and power-off process will be described with reference to fig. 3 and 4. Fig. 3 is a front view of the pad segment mounted on the friction wheel and fig. 4 is a side view of the pad segment mounted on the friction wheel. As shown in fig. 4, when the steel wire rope 200 enters the range of the wrap angle (referring to the angle of the steel wire rope around the contact pad segment) of the friction wheel from the running point along with the rotation of the elevator friction wheel 100, the pressure sensor 13 of the lower structure of a pad segment on the upper side of the running point detects the pressure of the steel wire rope on the pad segment, and then outputs a pressure signal to the control circuit, and the control circuit controls the electromagnet of the lower structure of the pad segment to be electrified, so that the pad segment generates a magnetic field and generates an attraction force on the steel wire rope. Under the action of the attraction force, the steel wire rope in the range of the surrounding angle is attracted to the liner segment and the pressure on the liner segment is increased.

Each liner segment entering the range of the enclosed angle is subjected to the above process, and the electromagnet of the lower structure is in an electrified state. The steel wire rope in the surrounding angle range is under the action of a magnetic field of the liner segment, the steel wire rope in the rope groove is attracted to the liner segment, the steel wire rope 200 generates larger pressure on the liner segment 1, and the pressure is the sum of the dead weight of the conventional steel wire rope and the attraction of the terminal load and the liner segment to the steel wire rope, so that the steel wire rope 200 and the liner segment 1 can obtain larger maximum static friction force (the maximum friction force without slipping), and the capacity and the running stability of a lifting system are improved.

When the steel wire rope 200 leaves the pad segment 1 on the friction wheel 100 from the running point, the pressure sensor 13 in the lower structure 12 of the pad segment 1 detects that the pressure of the steel wire rope 200 on the pad segment 1 disappears and outputs a signal to the control circuit, the control circuit controls the electromagnet in the pad segment which is not in contact with the steel wire rope to be powered off, the magnetic field of the electromagnet disappears, and the attraction force on the steel wire rope is not generated.

The electromagnet of the lower structure 12 of a single lining segment 1 is energized and de-energized once per revolution of the friction wheel 100 of the hoisting machine. The liner segment which is rotated to the position within the surrounding angle of the steel wire rope on the friction wheel is in an electrified state, so that the liner segment which is in contact with the steel wire rope has an attraction effect on the steel wire rope, the steel wire rope has higher pressure on the liner segment, and the steel wire rope and the liner segment can obtain larger maximum static friction force; the liner segments rotating to the outside of the surrounding angle are in a power-off state, the magnetic field of the electromagnet disappears, and the attraction force on the steel wire rope is not generated, so that the steel wire rope can be ensured to run along a normal running path outside the surrounding angle.

Further, the attraction force of the electromagnet can be varied by varying the input current to the electromagnet to obtain the desired positive pressure of the cord against the liner segment. When the electromagnet is electrified, a strong magnetic field can be generated to attract the ferromagnetic substance. The size of the input current is changed, and the corresponding electromagnet attraction force is changed, so that the required positive pressure of the steel wire rope on the lining pad section is obtained.

Furthermore, the gasket section needs a reliable power supply, when the power grid is suddenly powered off, the power supply can be automatically switched, a standby circuit can be adopted to continuously supply power to the electromagnet, and the electromagnet is ensured to continuously attract the steel wire rope.

Of course, the present invention can have other various embodiments, and those skilled in the art can make various corresponding changes and modifications according to the present invention without departing from the spirit and the essence of the present invention, and these corresponding changes and modifications are within the scope of the claims of the present invention.

Claims

1. The utility model provides an electromagnetic friction liner for friction formula lifting machine which characterized in that, includes a plurality of liner segmentation, the liner segmentation is the circular arc section, and a plurality of liner segmentation are used for the series arrangement to be cyclic annular and install on the outer circumference of lifting machine friction pulley, and each liner segmentation radially includes along the circular arc section:

a lower structure connected with the upper structure, the lower structure is an electromagnet, the lower surface of the lower structure is provided with a pressure sensor,

the control circuit is connected with the electromagnet and the pressure sensor, receives a pressure signal of the pressure sensor, sends the signal to the electromagnet and controls the electrification and the outage of the electromagnet,

2. An electromagnetic friction lining for a friction hoist as defined in claim 1 wherein the lining segments are annularly mounted on the outer circumference of the hoist sheave in axially juxtaposed relationship.

3. An electromagnetic friction lining for a friction elevator as defined in claim 1 wherein the thickness of the substructure is 2/3 of the total thickness of the lining segment.

4. The electromagnetic friction pad for a friction-type lifter of claim 1 wherein the control circuit varies the attraction force of the electromagnet by varying the input current to the electromagnet to adjust the positive pressure of the wire rope on the pad segment.

5. An electromagnetic friction lining for a friction hoist as defined in claim 1 wherein the curvature of the substructure is the same as the outer circumferential curvature of the hoist sheave.

6. The electromagnetic friction lining for friction elevators according to claim 1, wherein the rope grooves are double rope grooves.

7. An electromagnetic friction pad for a friction lift according to claim 1 wherein said pressure sensor is embedded in the lower surface of the substructure.

8. An electromagnetic friction lining for a friction elevator according to claim 1,

the control circuit is connected with the pressure sensor and the electromagnet in a wireless transmission mode.