CN108131402B - Double-way memory alloy locking device - Google Patents

Abstract

The double-way memory alloy locking device comprises a brake device mounting plate 10, wherein the brake device mounting plate 10 is arranged on a fixed base 11, an unlocking guide wheel 1 and a double-way memory alloy wire 2 are arranged on the brake device mounting plate 10, one end of the double-way memory alloy wire 2 is fixed on the brake device mounting plate 10, is fixed on the surface of the mounting plate 10 through 3, winds around the surface of the brake device mounting plate 10, winds around the unlocking guide wheel 1, and the other end of the double-way memory alloy wire is connected with an unlocking wedge 9; the center of the brake mounting plate 10 is perforated, the rotary shaft 5 is passed through the hole, the left and right sides of the rotary shaft 5 are respectively contacted with the left brake shoe 4 and the right brake shoe 7 through the micro-engagement pair 8, the lower sides of the left brake shoe 4 and the right brake shoe 7 are connected with the brake plate spring 6, and the upper sides clamp the unlocking wedge 9.

Description

A dual-range memory alloy locking device

Technical Field

The technology belongs to the field of locking devices, and specifically relates to a dual-range memory alloy locking device.

Background technique

Rotational motion with a fixed axis system is one of the main forms of motion in mechanical transmission. In the fields of inertial navigation test equipment, search and tracking turntables, etc., the rotation of the axis system is the most important form of motion. In order to achieve high precision requirements, these two types of equipment usually use direct-drive torque motors as drivers. The motor is in a free-rotating state without power, but in the process of debugging and transportation of these two types of mechanical equipment, it is sometimes necessary to brake the rotating axis system. In order to achieve the braking purpose of the equipment, the common braking forms currently include mechanical latches, electromagnetic brakes, etc. In most cases, the mechanical latch type braking device needs to be manually plugged in and out. There are also electromagnetically driven latches that use electronic control to achieve the locking and disengagement of the latch. The electromagnetic brake uses the principle of electromagnets to control the braking and disengagement of the rotating axis system through a DC power supply.

The locking structures of the latch and electromagnetic brake both have certain structural dimensions and large installation space requirements. For micro turntables with smaller design dimensions, these two locking methods often cannot meet the braking requirements under the conditions of strict size restrictions and small installation space. Therefore, current braking technology often cannot meet the braking requirements of tracking turntables. In addition, the electromagnetic brake has high power consumption. If the heat dissipation design is not perfect, it is very easy to cause the temperature rise of the brake and the braked shaft system, thereby affecting the installation accuracy of the shaft system.

Summary of the invention

The purpose of the present invention is to provide a two-way memory alloy locking device to solve the problem that a rotary shaft system with strict structural size requirements and small installation space cannot be automatically locked and unlocked by existing methods, while also reducing power consumption and lowering temperature rise near the brake mechanism.

The technical solution of the present invention is as follows: a two-way memory alloy locking device, including a brake device mounting plate, an unlocking guide wheel and a two-way memory alloy wire are installed on the brake device mounting plate, one end of the two-way memory alloy wire is fixed on the brake device mounting plate, and after it is wrapped around the surface of the brake device mounting plate and around the unlocking guide wheel, the other end is connected to the unlocking wedge; a hole is opened in the center of the brake device mounting plate, and a rotating shaft passes through the hole, and the left and right sides of the rotating shaft are respectively in contact with the left brake shoe and the right brake shoe through a micro-meshing pair, and the lower sides of the left brake shoe and the right brake shoe are connected to the brake leaf spring, and the upper sides clamp the unlocking wedge.

The brake device mounting plate is mounted on a fixed base.

The two-way memory alloy wire is fixed on the surface of the mounting plate through a wire drawing guide pair.

The significant effect of the present invention is that the present invention is more suitable for locking and braking occasions of miniature rotary shaft systems with strict structural dimension requirements and small installation space compared with the existing technology. The braking mechanism can make full use of the circumferential dimension of the shaft system, while reducing the requirement for the axial dimension of the shaft system as much as possible. The two-way memory alloy braking device can realize the disengagement action of the shaft system within ms time. The problem that the existing braking method cannot be used for automatic locking and disengagement of miniature rotary shaft systems is solved.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic diagram of a dual-path memory alloy locking device according to the present invention.

FIG. 2 is a side view of a dual-range memory alloy locking device according to the present invention.

In the figure: 1 unlocking guide wheel, 2 two-way memory alloy wire, 3 wire drawing guide pair, 4 left brake shoe, 5 rotary shaft, 6 brake leaf spring, 7 right brake shoe, 8 micro meshing pair, 9 unlocking wedge, 10 brake device mounting plate, 11 fixed base

Detailed ways

The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

A two-way memory alloy locking device, comprising a brake device mounting plate 10, the brake device mounting plate 10 is mounted on a fixed base 11, an unlocking guide wheel 1 and a two-way memory alloy wire 2 are mounted on the brake device mounting plate 10, one end of the two-way memory alloy wire 2 is fixed to the brake device mounting plate 10, fixed to the surface of the mounting plate 10 by 3, and after being wound around the surface of the brake device mounting plate 10 and around the unlocking guide wheel 1, the other end is connected to the unlocking wedge 9; a hole is opened in the center of the brake device mounting plate 10, and a rotary shaft 5 passes through the hole, and the left and right sides of the rotary shaft 5 are respectively in contact with the left brake shoe 4 and the right brake shoe 7 through a micro-engaging pair 8, and the lower sides of the left brake shoe 4 and the right brake shoe 7 are connected to the brake leaf spring 6, and the upper sides clamp the unlocking wedge 9;

If the rotating shaft system is to be released from braking, the two ends of the two-way memory alloy wire 2 are powered on to 24V. Within the time of ms after power on, the two-way memory alloy wire 2 can be contracted, and the unlocking wedge 9 is pulled upward to open the brake leaf spring 6, so that the left brake shoe 4 and the right brake shoe 7 are separated from the rotating shaft 5, and the micro-engaging pair 8 does not work, so that the rotating shaft 5 can be freely rotated. During the entire power-on process, the two-way memory alloy wire 2 is in a contracted state, and the shaft system is also in a correspondingly released braking state. At this time, the voltage at both ends of the two-way memory alloy wire 2 is reduced to 10V, and the two-way memory alloy remains in a contracted state, but the power consumption is significantly reduced, thereby realizing the release braking function under a low-power state. If you want to achieve braking, disconnect the power supply to the two-way memory alloy wire 2, and the two-way memory alloy wire 2 will return to its original length within a few seconds. The unlocking wedge 9 moves downward under the action of the clamping force of the brake leaf spring 6, and the brake leaf spring 6 drives the left brake shoe 4 and the right brake shoe 7 to restore the holding state of the rotating shaft 5 through the friction force generated by the micro-engaging pair 8. The shaft system is braked again.

Claims (1)

1. A double-way memory alloy locking device is characterized in that: the device comprises a brake device mounting plate (10), an unlocking guide wheel (1) and a double-way memory alloy wire (2) are arranged on the brake device mounting plate (10), one end of the double-way memory alloy wire (2) is fixed on the brake device mounting plate (10), winds around the surface of the brake device mounting plate (10) for one circle, and is connected with an unlocking wedge block (9) after winding on the unlocking guide wheel (1); the center of the brake device mounting plate (10) is provided with a hole, the rotary shaft (5) passes through the hole, the left side and the right side of the rotary shaft (5) are respectively contacted with the left brake shoe (4) and the right brake shoe (7) through micro-meshing pairs (8), the lower sides of the left brake shoe (4) and the right brake shoe (7) are connected with a brake plate spring (6), and the upper sides of the left brake shoe and the right brake shoe are clamped with an unlocking wedge block (9);

the brake device mounting plate (10) is mounted on the fixed base (11);

the double-way memory alloy wire (2) is fixed on the surface of the mounting plate (10) through the wire drawing guide pair (3).