Structure for increasing magnetic flux of power-off brake of elevator traction machine

Abstract

The utility model relates to a structure for increasing magnetic flux of a power-off brake of an elevator traction machine, a brake assembly comprises a brake disc and a friction plate, the friction plate is circumferentially arranged on the edge of the brake disc, four coil combinations which are circumferentially arranged at equal intervals are arranged on a static plate, a plurality of spring holes are arranged among the coil combinations, and the spring holes are arranged on the static plate. The coil combination comprises an iron core and a coil, the iron core and the coil are roughly oval, magnetic flux can be increased on the premise that an existing static plate is not changed, cost is reduced, and meanwhile economical efficiency and installation convenience are improved.

Description

Technical Field

[0001] The utility model relates to a structure for increasing the magnetic flux of a power-off brake of an elevator traction machine. Background Art

[0002] After the corresponding DC voltage is input to the brake magnetic coil, the brake immediately generates a magnetic field, and the moving plate overcomes the spring pressure and is attracted to the static plate. Because the gear sleeve inside the brake disc assembly is in a sliding state, and the gear sleeve is fixed on the main shaft of the traction machine, the brake disc assembly is suspended between the moving plate and the traction machine braking surface, and the friction plate is separated from the braking surface device. At this time, the elevator traction machine is in a released state and the elevator is working. When the brake loses power, the brake is released by the elastic force of the spring, and the friction plate surface contacts the braking surface, and friction (torque) is generated to fix the elevator.

[0003] According to the formula: Φ=B·S, where magnetic flux Φ=the product of magnetic induction intensity B and area S, Φ is the magnetic flux, B is the magnetic induction intensity, and S is the area passing vertically through the magnetic field lines. The size of the magnetic flux generated is related to the cross-sectional area of ​​the coil core. The larger the cross-sectional area of ​​the coil core, the greater the magnetic flux.

[0004] The existing technology mainly adopts a method of increasing the cross-sectional area of ​​the coil core, but this method is limited by the installation location of the core, that is, the area of ​​the static plate. Therefore, a structure for increasing the magnetic flux of the elevator traction machine power-off brake is required. Utility Model Content

[0005] The purpose of the utility model is to solve the above shortcomings of the prior art and provide a structure for increasing the magnetic flux of the elevator traction machine power-off brake without changing the structure of the static plate. The purpose of the utility model is achieved as follows:

[0006] A structure for increasing the magnetic flux of an elevator traction machine power-off brake comprises a moving plate, a stationary plate and a brake assembly, wherein the brake assembly and the stationary plate are connected by a spline structure, the moving plate is arranged between the brake assembly and the stationary plate, the stationary plate is provided with four coil assemblies arranged equidistantly in the circumference, a plurality of spring holes are provided between the coil assemblies, the coil assembly comprises an iron core and a coil, the iron core comprises a first arc, a second arc, a third arc and a fourth arc arranged in sequence around the axis of the iron core, the center of the first arc is located on the outside of the iron core, the center of the second arc is located on the inside of the iron core, the center of the third arc is located on the inside of the iron core, the center of the fourth arc is located on the inside of the iron core, and the coil is arranged close to the surface of the iron core.

[0007] At least four spring holes are arranged between any two of the iron cores, the spring holes correspond to each other in pairs, and the distance between the inner spring holes is smaller than the distance between the outer spring holes.

[0008] For better installation, the static plate is a split structure, and the static plate includes a first magnetic yoke and a second magnetic yoke, a slit is provided between the first magnetic yoke and the second magnetic yoke, and two iron cores are provided on the first magnetic yoke and the second magnetic yoke respectively.

[0009] For better firmness, the static plate is an integral structure.

[0010] For stronger magnetic flux, the coils are connected in parallel via wires.

[0011] In order to have a stronger magnetic flux, the conductor and the coil are both made of copper enameled wire.

[0012] In order to protect the device and better resist the wear caused by friction, the surfaces of the moving plate, the stationary plate and the brake assembly are all provided with a phosphating layer and a black paint layer.

[0013] Beneficial effects: The elliptical core design increases the magnetic flux without changing the existing static plate structure, which can reduce R&D and production costs. At the same time, the existing manufacturing processes and materials can be used to improve the economy of the design. The structure of the existing static plate remains unchanged, so that new products can use traditional installation methods without additional customized modifications or complex adjustments, which improves the ease and efficiency of installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic cross-sectional structure diagram of a static plate of a structure for increasing magnetic flux of an elevator traction machine power-off brake according to the first embodiment;

[0015] Figure 2 It is a schematic cross-sectional structure diagram of a static plate of a structure for increasing magnetic flux of an elevator traction machine power-off brake according to a second embodiment.

[0016] In the figure: 1 static plate, 1-1 coil combination, 1-2 iron core, 1-3 coil, 1-4 slit, 1-5 conductor, R1 first arc, R2 second arc, R3 third arc, R4 fourth arc. DETAILED DESCRIPTION

[0017] In order to deepen the understanding of the present invention, the present invention will be further described in detail below in conjunction with embodiments and drawings. The embodiments are only used to explain the present invention and do not constitute a limitation on the protection scope of the present invention.

[0018] Embodiment 1:

[0019] Please see Figure 1-2A structure for increasing magnetic flux of a power-off brake of an elevator traction machine, comprising a moving plate, a stationary plate 1 and a brake assembly 2, wherein the brake assembly 2 and the stationary plate 1 are connected by a spline structure, the moving plate is arranged between the brake assembly 2 and the stationary plate 1, the stationary plate 1 is provided with four coil 1-3 combinations 1-1 arranged equidistantly in the circumferential direction, a plurality of spring holes are arranged between the coil 1-3 combinations 1-1, the coil 1-3 combinations 1-1 comprise an iron core 1-2 and a coil 1-3, the iron core and the coil 1-3 are both elliptical, the iron core 1-2 comprises a first arc R1, a second arc R2, a third arc R3 and a fourth arc R4 arranged in sequence around the axis of the iron core 1-2, the center of the first arc R1 is located on the outside of the iron core 1-2, the center of the second arc R2 is located on the inside of the iron core 1-2, the center of the third arc R4 is located on the inside of the iron core 1-2, and the center of the fourth arc R5 is located on the inside of the iron core 1-2. The center of the arc R3 is located on the inner side of the iron core 1-2, and the center of the fourth arc R4 is located on the inner side of the iron core 1-2. The coil 1-3 is arranged close to the surface of the iron core 1-2. At least 4 spring holes are arranged between any two iron cores 1-2, and the spring holes correspond to each other. The distance between the inner spring holes is smaller than the distance between the outer spring holes. The static plate 1 is a split structure. The static plate 1 includes a first magnetic yoke and a second magnetic yoke. A slit 1-4 is arranged between the first magnetic yoke and the second magnetic yoke. Two iron cores 1-2 are arranged on the first magnetic yoke and the second magnetic yoke respectively. The coils 1-3 are connected in parallel through wires 1-5. The wires 1-5 and the coils 1-3 are made of copper enameled wire. The surfaces of the moving plate, the static plate 1 and the brake assembly 2 are provided with a phosphating layer and a black paint layer.

[0020] Embodiment 2:

[0021] Please see Figure 1-2A structure for increasing magnetic flux of an elevator traction machine power-off brake comprises a moving plate, a stationary plate 1 and a brake assembly 2, wherein the brake assembly 2 and the stationary plate 1 are connected by a spline structure, the moving plate is arranged between the brake assembly 2 and the stationary plate 1, the stationary plate 1 is provided with four coil 1-3 combinations 1-1 arranged equidistantly in the circumferential direction, a plurality of spring holes are arranged between the coil 1-3 combinations 1-1, the coil 1-3 combinations 1-1 comprise an iron core 1-2 and a coil 1-3, the iron core and the coil 1-3 are both elliptical, the iron core 1-2 comprises a first arc R1, a second arc R2, a third arc R3 and a fourth arc R4 arranged in sequence around the axis of the iron core 1-2, the center of the first arc R1 is located at the center of the iron core 1 -2, the center of the second arc R2 is located on the inner side of the iron core 1-2, the center of the third arc R3 is located on the inner side of the iron core 1-2, the center of the fourth arc R4 is located on the inner side of the iron core 1-2, the coil 1-3 is arranged close to the surface of the iron core 1-2, at least 4 spring holes are arranged between any two iron cores 1-2, the spring holes correspond to each other, the distance between the inner spring holes is smaller than the distance between the outer spring holes, the static plate 1 is an integral structure, the coils 1-3 are connected in parallel through the wire 1-5, the wire 1-5 and the coil 1-3 are made of copper enameled wire, and the surfaces of the moving plate, the static plate 1 and the brake assembly 2 are provided with a phosphating layer and a black paint layer.

[0022] Here is how it works:

[0023] The brake is a power-off brake. When the brake is not working, it is in a power-off state. There is a gap of 0.25mm to 0.35mm between the moving plate and the static plate 1, which is called the working gap. When the brake coil 1-3 is energized (DC), the coil 1-3 and the coil 1-3 core 1-2 generate a magnetic field. The magnetic field overcomes the positive pressure of the spring and attracts the moving plate to the static plate 1. After the moving plate and the static plate 1 are attached, the brake disc 2-1 relies on the centrifugal force of the rotating shaft to suspend between the braking surface of the fuselage and the braking surface of the moving plate. The gap between them is theoretically 0.15mm, that is, the friction plate 2-2 at one end of the brake disc 2-1 is separated from the braking surface of the fuselage, and the friction plate 2-2 at the other end of the brake disc 2-1 is separated from the braking surface of the moving plate at the same time, and the traction machine motor works (also the elevator works). When the brake coil 1-3 loses power, the coil 1-3 and the coil 1-3 iron core 1-2 lose the magnetic field. Under the action of the positive pressure of the spring in the spring hole: the disc brake fits the moving plate and the fuselage through the brake disc 2-1 to achieve the braking effect.

[0024] The cross-sectional area of ​​the existing product coil 1-3 core 1-2 is: 3524mm 2 / pcs, the cross-sectional area after the present invention is changed to an elliptical shape is: 4428mm 2 / pieces, so as to increase the cross-sectional area of ​​the coil 1-3 core 1-2, thereby increasing the magnetic flux, and reducing the amount of enameled wire used, thereby reducing material costs.

[0025] Under the condition that all parameters are the same, the weight of enameled wire consumed by the existing product is 1.55KG / unit. After the device is changed to an elliptical shape, the weight of enameled wire consumed is 0.86KG / unit. Based on the current price of enameled wire of 85 yuan / KG, the material cost is reduced by: (1.55-0.86)x85=58.86 yuan / unit.

[0026] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A structure for increasing magnetic flux of an elevator traction machine power-off brake, comprising a moving plate, a static plate and a brake assembly, wherein the brake assembly and the static plate are connected by a spline structure, and the moving plate is arranged between the brake assembly and the static plate, characterized in that: The stationary plate is provided with four coil combinations equidistantly arranged in the circumferential direction, and a plurality of spring holes are provided between the coil combinations. The coil combination includes an iron core and a coil. The iron core includes a first arc, a second arc, a third arc and a fourth arc arranged in sequence around the axis of the iron core, the center of the first arc is located on the outside of the iron core, the center of the second arc is located on the inside of the iron core, the center of the third arc is located on the inside of the iron core, and the center of the fourth arc is located on the inside of the iron core. The coil is arranged close to the surface of the iron core.

2. The structure for increasing the magnetic flux of the power-off brake of an elevator traction machine according to claim 1 is characterized in that: At least four spring holes are arranged between any two of the iron cores, the spring holes correspond to each other in pairs, and the distance between the inner spring holes is smaller than the distance between the outer spring holes.

3. The structure for increasing the magnetic flux of the power-off brake of an elevator traction machine according to claim 1 is characterized in that: The static plate is a split structure, and includes a first magnetic yoke and a second magnetic yoke. A slit is provided between the first magnetic yoke and the second magnetic yoke. Two iron cores are provided on the first magnetic yoke and the second magnetic yoke, respectively.

4. The structure for increasing magnetic flux of an elevator traction machine power-off brake according to claim 1, characterized in that: The static plate is an integral structure.

5. The structure for increasing magnetic flux of an elevator traction machine power-off brake according to claim 1, characterized in that: The coils are connected in parallel via conductive wires.

6. A structure for increasing magnetic flux of an elevator traction machine power-off brake according to claim 5, characterized in that: The conductor and the coil are both made of copper enameled wire.

7. The structure for increasing magnetic flux of an elevator traction machine power-off brake according to claim 1, characterized in that: The surfaces of the moving plate, the stationary plate and the brake assembly are all provided with a phosphating layer and a black paint layer.

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