CN109131911B

CN109131911B - Safety execution device inertia assembly

Info

Publication number: CN109131911B
Application number: CN201811094473.7A
Authority: CN
Inventors: 张耘
Original assignee: Guizhou Aerospace Electronic Technology Co Ltd
Current assignee: Guizhou Aerospace Electronic Technology Co Ltd
Priority date: 2018-09-19
Filing date: 2018-09-19
Publication date: 2021-10-01
Anticipated expiration: 2038-09-19
Also published as: CN109131911A

Abstract

The invention provides an inertia assembly of a safety execution device, which comprises a seat, a sliding block and an eccentric wheel; a movable sliding block is arranged below the seat, two springs are vertically fixed at the bottom of the sliding block, the seat is fixed on the shell, the eccentric wheel can be rotationally fixed on the shell, the rotational freedom degree of the eccentric wheel is controlled by an electric actuator, and the electric actuator controls the eccentric wheel to rotate when the sliding block moves to compress the springs; the middle position on the seat is fixed with an elastic sleeve clamp so that the end surfaces of the sliding block and the seat are not contacted. According to the invention, the elastic sleeve clamp is fixed between the sliding block and the seat, so that a certain gap is kept between the sliding block and the seat, and the cooling rate of the elastic sleeve clamp is lower than that of the metal seat and the sliding block, so that water molecules are not easy to condense on the surface of the elastic sleeve clamp, and polytetrafluoroethylene has better non-adhesiveness and cannot form a bonding effect with a metal material; the spring is fixed at the bottom of the sliding block, so that the bonding between the side surface of the spring and any wall surface of the sliding block can be avoided; the arrangement of the eccentric wheel also ensures the realization of secondary inertia insurance based on the structure.

Description

Safety execution device inertia assembly

Technical Field

The invention relates to an inertia assembly of a safety execution device.

Background

The invention discloses an inertia safety mechanism, which realizes the high reliability design of inertia safety through the structure of a restraint pin, a guide frame, an inertia block, a compression spring and the like, but in practice, the invention discovers that although the design has high reliability, the action contact surface of the inertia block is a machined surface with lower surface roughness during machining, large-area close contact exists under the action of the spring force, after a random vibration test, the contact surface is further polished, under the low temperature condition of minus 40 ℃, because water molecules remained in the air in a product are condensed and the bonding effect between two metal materials, the upper end surface of the inertia block is bonded, and in the low temperature inertia starting overload measurement, the centrifugal force of the sliding block needs to overcome not only the elastic force of the spring but also the adhesive force of the action contact surface of the inertia block, and due to the uncertainty of the adhesive strength, the measurement of the inertia starting overload value is influenced by overcoming the difference of the adhesive force of the action contact surface of the inertia block.

Disclosure of Invention

In order to solve the technical problems, the invention provides the inertia assembly of the safety execution device, which can effectively avoid water molecules from being condensed on the surface through the structural arrangement of a seat, a sliding block, an eccentric wheel, an elastic collet and the like, thereby effectively avoiding the condition of influencing the measurement of the inertia starting overload value caused by the processing problem.

The invention is realized by the following technical scheme.

The invention provides an inertia assembly of a safety execution device, which comprises a seat, a sliding block and an eccentric wheel; a movable sliding block is arranged below the seat, two springs are vertically fixed at the bottom of the sliding block, the seat is fixed on the shell, the eccentric wheel can be rotationally fixed on the shell, the rotational freedom degree of the eccentric wheel is controlled by an electric actuator, and the electric actuator controls the eccentric wheel to rotate when the sliding block moves to compress the springs; the middle position on the seat is fixed with an elastic sleeve clamp so that the end surfaces of the sliding block and the seat are not contacted.

The electric controller controls the rotational freedom of the eccentric wheel through the eccentric wheel shaft pin.

Two switch contacts of the electric actuator are led out downwards from the seat, and a conductive bar is fixed at the upper end of the sliding block, so that the two switch contacts of the electric actuator are conducted when the sliding block moves to compress the spring.

The elastic sleeve clamp is made of polytetrafluoroethylene.

The elastic sleeve clamp is a cylinder with boss structures at the upper end and the lower end.

The upper end of the elastic collet is vertically provided with an opening downwards, so that the side wall of the upper end of the elastic collet can contract towards the inner ring.

The boss structure at the upper end of the elastic collet is a cone.

The elastic sleeve clamp is fixed on the seat through clamping.

The invention has the beneficial effects that: an elastic sleeve clamp is fixed between the sliding block and the seat, so that a certain gap is kept between the sliding block and the seat, and the cooling rate of the elastic sleeve clamp is lower than that of the metal seat and the sliding block, so that water molecules are not easy to condense on the surface of the elastic sleeve clamp, and the polytetrafluoroethylene has better non-adhesiveness and cannot form a bonding effect with a metal material; the spring is fixed at the bottom of the sliding block, so that the bonding between the side surface of the spring and any wall surface of the sliding block can be avoided; the arrangement of the eccentric wheel also ensures the realization of secondary inertia insurance based on the structure.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic perspective view of the slider portion of FIG. 1;

FIG. 3 is a schematic view of the structure of FIG. 2 in another operating state;

fig. 4 is a schematic view of the structure of the elastic cartridge of fig. 1.

In the figure: 11-seat, 12-slide block, 13-eccentric wheel, 14-eccentric wheel shaft pin, 15-sharp plate and 21-elastic collet.

Detailed Description

The technical solution of the present invention is further described below, but the scope of the claimed invention is not limited to the described.

The safety actuator inertia assembly as shown in fig. 1 to 4 comprises a seat 11, a slide block 12 and an eccentric wheel 13; a movable sliding block 12 is arranged below the seat 11, two springs are vertically fixed at the bottom of the sliding block 12, the seat 11 is fixed on the shell, an eccentric wheel 13 can be rotationally fixed on the shell, the rotational freedom degree of the eccentric wheel 13 is controlled by an electric actuator, and the electric actuator controls the eccentric wheel 13 to rotate when the sliding block 12 moves to compress the springs; an elastic collet 21 is fixed to the seat 11 at a central position thereof so that the slider 12 does not contact the end surface of the seat 11.

The electrical control unit controls the rotational freedom of the eccentric 13 via the eccentric shaft pin 14.

Two switch contacts of the electric actuator are led out downwards from the seat 11, and a conductive strip is fixed at the upper end of the sliding block 12, so that the two switch contacts of the electric actuator are conducted when the sliding block 12 moves to compress the spring.

Specifically, the elastic collet 21 is made of polytetrafluoroethylene.

In order to facilitate the installation and fixation of the elastic collet 21, the elastic collet 21 is a cylinder with boss structures at the upper end and the lower end; an opening is vertically formed downwards at the upper end of the elastic sleeve clamp 21, so that the side wall of the upper end of the elastic sleeve clamp 21 can contract towards an inner ring; the boss structure at the upper end of the elastic collet 21 is a cone; the elastic collet 21 is fixed to the seat 11 by snap fitting.

In the product debugging process, in order to check the overload value of the spring-slider system which is actually sensitive under the extreme environmental condition, the centrifugal acceleration is used for being equivalent to the acceleration of an engine, the inertia starting overload of the safety execution device is measured through a low-temperature centrifugal test, and the scheme is verified by the test that the slider does not generate the bonding phenomenon under the low-temperature state, so that the measurement of the inertia starting overload value is ensured.

Claims

1. The utility model provides a safe final controlling element inertia subassembly, includes seat (11), slider (12), eccentric wheel (13), its characterized in that: a movable sliding block (12) is arranged below the seat (11), two springs are vertically fixed at the bottom of the sliding block (12), the seat (11) is fixed on the shell, the eccentric wheel (13) can be rotationally fixed on the shell, the rotational freedom degree of the eccentric wheel (13) is controlled by the electric actuator, and the electric actuator controls the eccentric wheel (13) to rotate when the sliding block (12) moves to compress the springs; an elastic sleeve clamp (21) is fixed at the middle position on the seat (11) to ensure that the sliding block (12) is not contacted with the end surface of the seat (11); the electric controller controls the rotational freedom degree of the eccentric wheel (13) through the eccentric wheel shaft pin (14); two switch contacts of the electric actuator are led out downwards from the seat (11), and a conductive bar is fixed at the upper end of the sliding block (12) to ensure that the two switch contacts of the electric actuator are conducted when the sliding block (12) moves to compress the spring; the elastic sleeve clamp (21) is made of polytetrafluoroethylene.

2. The safety actuator inertial assembly of claim 1, wherein: the elastic sleeve clamp (21) is a cylinder with boss structures at the upper end and the lower end.

3. The safety actuator inertial assembly of claim 2, wherein: the upper end of the elastic collet (21) is vertically provided with a downward opening, so that the side wall of the upper end of the elastic collet (21) can contract towards the inner ring.

4. The safety actuator inertial assembly of claim 2, wherein: the boss structure at the upper end of the elastic collet (21) is a cone.

5. The safety actuator inertial assembly of claim 1, wherein: the elastic sleeve clamp (21) is fixed on the seat (11) through clamping.