CN111262004B

CN111262004B - A cam locking mechanism with self-locking function

Info

Publication number: CN111262004B
Application number: CN202010161979.6A
Authority: CN
Inventors: 廖晓容; 王俊杰; 李文生; 李秀萍
Original assignee: Chengdu Jinjiang Electronic System Engineering Co Ltd
Current assignee: Chengdu Jinjiang Electronic System Engineering Co Ltd
Priority date: 2020-03-10
Filing date: 2020-03-10
Publication date: 2025-02-25
Anticipated expiration: 2040-03-10
Also published as: CN111262004A

Abstract

The invention relates to a cam locking mechanism with a self-locking function, which comprises a long bottom plate, wherein a support is arranged on the upper surface of the left side of the long bottom plate, a supporting lug is arranged on the upper surface of the right side of the long bottom plate, a vertical cavity is formed in the support, a vertical shaft capable of moving up and down is arranged in the vertical cavity, the upper end of the vertical shaft extends out of the vertical cavity, a top plate is arranged at the upper end of the vertical shaft, a rotatable cam is arranged on the outer side surface of the support, the edge of the cam abuts against the lower surface of the top plate when the cam rotates so as to drive the vertical shaft to move up and down, the supporting lug is hinged with the bottom of a hydraulic cylinder, a piston rod of the hydraulic cylinder is eccentrically hinged on the cam, and the telescopic action of the piston rod drives the cam to rotate. The invention has the beneficial effects of simple and compact structure, small space occupation ratio, high positioning precision, high response speed, stability and reliability.

Description

Cam locking mechanism with self-locking function

Technical Field

The invention relates to the technical field of vehicle-mounted radar antennas, in particular to a cam locking mechanism with a self-locking function.

Background

In order to meet the requirements of rapid frame removal and tactical maneuverability improvement, a large-caliber vehicle-mounted radar antenna is generally processed into a foldable form on an antenna array surface. The automatic locking mechanism after the antenna side blocks are unfolded is a key device, and the locking performance of the automatic locking mechanism has important influence on the repeated positioning precision of each side block and the antenna profile maintaining precision under severe working conditions.

The common side block locking mechanism for realizing the in-place unfolding of the vehicle-mounted radar antenna comprises an electric/liquid direct-drive cylindrical bolt locking mechanism, an electric/liquid direct-drive conical pull pin locking mechanism, an electric/hydraulic four-bar locking mechanism and the like. In general, the locking mechanism has three basic sub-functions, namely locking action execution, locking state maintenance and locking state release, wherein the three basic sub-functions are important links to be considered in design, and the efficient, reliable and stable maintenance of the locking state is particularly critical.

In the locking state maintaining process of the electric/hydraulic direct-drive cylinder bolt locking mechanism (a small servo motor drives a gear to drive a sliding screw rod and pushes a cylinder bolt or a small common hydraulic cylinder pushes the cylinder bolt through a piston rod), the fit clearance between the cylinder bolt and a pin hole can cause the relative positions of two side blocks to be uncertain, the relative positions of the two side blocks can not be effectively and accurately positioned, and the antenna array face precision is increased by the adverse influence of variable wind load.

For an electric/hydraulic direct-drive taper pin locking mechanism (a small servo motor drives a gear to drive a sliding screw rod and pulls the taper pin or a small common hydraulic cylinder pulls the taper pin through a piston rod), when the locking state is released, the maximum static friction force of a system which the sliding screw rod needs to overcome is large, the phenomenon that the locking state is released unstably (namely the screw rod crawls) and the instantaneous current of the motor is overlarge is easy to occur, and the problems of larger power ratio per unit weight and larger power ratio per unit size still exist. The problem that the unit weight power ratio and the unit size power ratio are larger is avoided by adopting a mode that a small common hydraulic cylinder pulls a conical pull pin through a piston rod, but in the locking state maintaining process of the mechanism, the double-acting hydraulic cylinder is required to continuously provide stable hydraulic force, so that the problem of serious energy consumption is caused, even if the locking state is maintained by utilizing the spring restoring force of a single-acting hydraulic cylinder, when the antenna edge block is influenced by variable wind load, the restoring force of the spring still can be sufficiently fluctuated, and the profile precision of the antenna is further influenced.

By adopting the scheme of an electric/hydraulic four-bar locking mechanism (namely a crank sliding block mechanism, the rotation of a crank is pushed by a motor or a hydraulic cylinder, and a sliding block drives a conical pull pin), the locking state can be efficiently and stably maintained through the dead point of the four-bar mechanism, the energy consumption of an actuator when the locking action is executed and the locking state is released can be obviously reduced, but the mechanism occupies too large space of an antenna, has a complex structure, and still has the defect of not conforming to the design principle of light weight and compact structure of the antenna array surface of the vehicle-mounted radar.

Therefore, there is an urgent need to design a mechanism with simple structure, high positioning precision, fast locking action execution and locking state release response, low energy consumption, and high-efficiency, reliable and stable locking state to ensure the array plane precision of the foldable radar antenna and improve the reliability of the detection precision of the radar antenna

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide the cam locking mechanism with the self-locking function, which has the advantages of simple and compact structure, small space occupation ratio, high positioning precision, high response speed, stability and reliability.

The cam locking mechanism with the self-locking function comprises a long bottom plate, wherein a support is arranged on the upper surface of the left side of the long bottom plate, and a support lug is arranged on the upper surface of the right side of the long bottom plate; the support is provided with a vertical through cavity, a vertical shaft capable of moving up and down is arranged in the through cavity, the upper end of the vertical shaft extends out of the through cavity, and a top plate is arranged at the upper end of the vertical shaft;

the support lugs are hinged with the bottom of the hydraulic cylinder, a piston rod of the hydraulic cylinder is eccentrically hinged on the cam, and the telescopic action of the piston rod drives the cam to rotate.

Further, the long bottom plate is fixed on the locking block, the through cavity penetrates through the long bottom plate and the locking block, and a conical wide opening shape is formed at the locking block.

Preferably, the bottom of the vertical shaft is in a cone shape matched with the conical wide opening of the through cavity, the middle of the vertical shaft is in a stepped shaft shape, the middle of the vertical shaft is sleeved with a spring, the through cavity seals the upper cavity opening through the cover plate, and the spring abuts against the cover plate and the stepped shoulder of the vertical shaft.

Preferably, two symmetrical cams are arranged on the support, and the piston rods are hinged with the two cams respectively through a gantry-shaped connecting body.

Further, the long bottom plate is fixedly arranged on the antenna middle block, the locking block is fixedly arranged on the antenna side block, and the antenna middle block and the side block are locked through the cooperation of the vertical shaft with the conical surface and the locking block.

The invention has the following advantages:

(1) Compared with the problems of low positioning precision of the relative positions of the two side blocks, slow and unstable response of execution or release of the locking action of the mechanism, high energy consumption, instability, large space occupation ratio and the like caused by common locking mechanisms, the scheme has the advantages of compact and compact structure, small space occupation ratio, high positioning precision, high response speed of execution or release of the locking action, high stability and high manufacturing process of the mechanism, and the locking state can be efficiently, stably and reliably maintained under complex working conditions for a long time;

(2) The molded surface maintenance precision of the unfolded vehicle-mounted radar antenna array surface is reliably ensured, the effective design space of the antenna array surface is saved, the stable detection capability of the foldable radar antenna array surface under severe working conditions is improved, and important reference ideas and engineering examples are provided for the design of the radar antenna edge block locking mechanism.

Drawings

FIG. 1 is a schematic diagram of the structure of the present invention;

FIG. 2 is a schematic view of the left side of FIG. 1 in cross-section;

FIG. 3 is a schematic top view of the present invention;

In the figure, a long bottom plate, a 2-support, a 3-support lug, a 4-through cavity, a 5-vertical shaft, a 6-top plate, a 7-cam, an 8-hydraulic cylinder, an 801-piston rod, a 9-locking block, a 10-spring, an 11-cover plate and a 12-connector are arranged.

Detailed Description

The present invention will be further described with reference to the accompanying drawings, but the scope of the present invention is not limited to the following.

As shown in fig. 1-3, the cam locking mechanism with the self-locking function comprises a long bottom plate 1, wherein a support 2 is arranged on the upper surface of the left side of the long bottom plate 1, and a support lug 3 is arranged on the upper surface of the right side of the long bottom plate 1. The support 2 is provided with a vertical shaft 5 which can move up and down, and the support lug 3 is provided with a driving mechanism which drives the vertical shaft 5 to move up and down.

Specifically, in this scheme, open on support 2 along upper and lower direction has vertical logical chamber 4, has put vertical axle 5 in logical chamber 4, and the upper chamber mouth of logical chamber 4 is sealed through apron 11, and vertical axle 5 is little big step shaft form and its path axle is worn out from apron 11, has sheathed with spring 10 on vertical axle 5, and the lower extreme of spring 10 supports on the step shoulder and the upper end supports on the lower surface of apron 11. When the vertical shaft 5 moves upwards, the vertical shaft can be reset downwards under the action of the spring 10, so that the vertical shaft 5 can reciprocate upwards and downwards.

Further, a top plate 6 is coaxially arranged at the end, extending out of the cover plate 11, of the vertical shaft 5, the top plate 6 is fixedly screwed on the vertical shaft 5 through a nut, and corresponding external threads are formed at the upper end of the vertical shaft 5. The outer side surface of the support 2 is provided with a rotatable cam 7, the cam 7 eccentrically rotates along a vertical surface, the edge of the cam 7 is contacted with the bottom surface of the top plate 6, namely, when the cam 7 rotates, the top plate 6 is jacked up when the edge of the cam 7 far from the center is contacted with the top plate 6, and when the edge of the cam 7 near to the center is contacted with the top plate 6, the top plate 6 moves downwards under the action of a spring 10. The top plate 6 and the vertical shaft 5 are fixed integrally, and the vertical shaft 5 is operated together when the top plate 6 is operated up and down.

In order to realize the rotation of cam 7 in this scheme, with the bottom articulated of journal stirrup 3 pneumatic cylinder 8, and the piston rod 801 of pneumatic cylinder 8 then eccentric articulated on cam 7, pneumatic cylinder 8 pushes up cam 7 left through piston rod 601 when advancing oil, pulls cam 7 right through piston rod 801 when pneumatic cylinder 8 is in the play oil, realizes the rotation of cam.

Since the cam 7 and the top plate 6 are in separable contact, i.e., the distance the vertical shaft 5 moves upward when the cam 7 applies an upward force to the top plate 6 is unknown, the upward stroke of the vertical shaft 5 is ensured. The lower cavity opening of the through cavity 4 is in a conical wide opening shape, and the bottom end of the vertical shaft 5 is in a conical shape matched with the lower cavity opening.

In this embodiment, the long bottom plate 1 is fixed on the locking block 9, and the through cavity 4 penetrates the long bottom plate 1 and the locking block 9, and the conical wide opening shape of the through cavity 4 is located in the locking block 9.

In order to ensure that the forces of the cams 7 on the top plate 6 can be equalized, two symmetrical cams 7 are arranged on the side of the carrier 2, while the piston rods 801 are each articulated to two cams 7 by means of a portal-like connection 12.

In this embodiment, when the cam 7 lifts the top plate 6, as shown in fig. 1, the edge of the upper left part is arc-shaped, the edge of the lower right part is right-angled, the right-angled part is hinged with the hinge shaft and the bearing to the support 2, the upper edge is contacted with the bottom plate 6 and lifts it, the cam 7 at the right position near the left edge is hinged with the left end of the connecting body 12, and the right end of the connecting body 12 is fixedly connected with the piston rod 801.

When the antenna is in operation, an output member of the four-bar mechanism, namely the cam 7, is used as a power source of the flat-bottom driven cam mechanism, hydraulic pressure is amplified and commutated by the four-bar mechanism, the cam 7 transmits force to the top plate 6 through swinging motion, the top plate and the vertical shaft 5 are acted by the cam 7, the spring 10 and the through cavity 4 as one member, the contact surface of the through cavity 4 and the vertical shaft 5 forms a cylindrical pair), the vertical shaft 5 moves and rotates freely, the rotation displacement of the cam is finally converted into linear displacement of the vertical shaft 5, the separation and combination of the conical surface at the bottom end of the vertical shaft 5 and the conical surface of the locking block 9 are realized through the up-down movement of the vertical shaft 5, meanwhile, the actual running position of the cam 7 is in a certain angle range, the hydraulic cylinder 8 removes the pressure, the friction self-locking effect is formed by the interaction force among the top plate 6, the contour of the cam 7 and the through cavity 5, the high-efficient and stable combination state among conical positioning surfaces is realized, the tight fit between two antenna side blocks can be ensured, the high-precision positioning between the two antenna side blocks is realized, the hydraulic cylinder 8 applies oiling pressure again, the separation and the final separation between the conical surfaces of the two antenna side blocks is realized under the action force of the spring 10, and the antenna side separation and the antenna side is successfully completed.

In the scheme, a long bottom plate 1 is fixedly arranged on an antenna middle block, a locking block 9 is fixedly arranged on an antenna side block, and when the antenna is locked, a cam 7 is driven by an oil cylinder 8 to drive a vertical shaft 5 to move, and the vertical shaft 5 with a conical surface is matched with the locking block 9 to lock the antenna middle block and the antenna side block.

Claims

1. A cam locking mechanism with a self-locking function, characterized in that it comprises a long bottom plate (1), a support (2) is provided on the left upper surface of the long bottom plate (1), and a support ear (3) is provided on the right upper surface of the long bottom plate (1);

The support (2) is provided with a vertical through cavity (4), a vertical shaft (5) capable of upward and downward displacement is arranged in the through cavity (4), the upper end of the vertical shaft (5) extends out of the through cavity (4) and a top plate (6) is arranged at the upper end; the upper end of the vertical shaft (5) is provided with a corresponding external thread, and the top plate (6) is fixed and locked on the vertical shaft (5) by a nut;

A rotatable cam (7) is provided on the outer side surface of the support (2); when the cam (7) rotates, its edge abuts against the lower surface of the top plate (6), thereby driving the vertical shaft (5) to move up and down;

The support ear (3) is hinged to the bottom of the hydraulic cylinder (8), and the piston rod (801) of the hydraulic cylinder (8) is eccentrically hinged to the cam (7), and the telescopic action of the piston rod (801) drives the cam (7) to rotate;

A pad is provided between the long bottom plate (1) and the locking block (9), and the three are fixedly connected from top to bottom via a vertical axis (5);

The through cavity (4) penetrates the long bottom plate (1) and the locking block (9) and forms a tapered wide opening at the locking block (9); the bottom of the vertical shaft (5) is in the shape of a cone that matches the tapered wide opening of the through cavity (4), the middle part is in the shape of a stepped shaft and a spring (10) is sleeved in the middle part; the through cavity (4) is sealed at the upper cavity opening via the cover plate (11), and the spring (10) rests on the stepped shoulders of the cover plate (11) and the vertical shaft (5);

The long bottom plate (1) is mounted and fixed on the antenna middle block, and the locking block (9) is mounted and fixed on the antenna side block. The antenna middle block and the side block are locked by the cooperation of the vertical shaft (5) with a conical surface and the locking block (9).

2. A cam locking mechanism with a self-locking function according to claim 1, characterized in that: two symmetrical cams (7) are arranged on the support (2), and the piston rod (801) is hinged to the two cams (7) respectively through a gantry-shaped connector (12).

3. A cam locking mechanism with a self-locking function according to claim 2, characterized in that: the support ear (3) is a double ear, a connecting plate is fixed to the bottom of the hydraulic cylinder (8), a connecting hole is opened on the connecting plate, and a vertical axis is passed through the ear hole of the support ear (3) and the connecting hole of the connecting plate to realize the hinge connection between the two.