CN111262004A - A cam locking mechanism with self-locking function - Google Patents

Abstract

The invention relates to a cam locking mechanism with self-locking function, comprising a long base plate, a support is arranged on the upper surface of the left side of the long base plate, and a support lug is arranged on the upper surface of the right side of the long base plate; The through cavity is provided with a vertical shaft that can move up and down, the upper end of the vertical shaft extends out of the through cavity and a top plate is arranged at the upper end; When the edge touches the lower surface of the top plate, the vertical shaft moves up and down; the lug is hinged with the bottom of the hydraulic cylinder, the 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 beneficial effects achieved by the invention are as follows: the structure is simple and compact, the proportion of space is small, the positioning accuracy is high, the response speed is fast, and it is stable and reliable.

Description

A 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 technique

In order to meet the requirements of rapid erection and withdrawal and improve tactical mobility, the large-caliber vehicle-mounted radar antenna usually treats the antenna array as a foldable form. Among them, the automatic locking mechanism that realizes the deployment of the antenna side blocks is a key device, and its locking performance has an important influence on the repeatability of each side block and the retention accuracy of the antenna profile under severe working conditions.

The common side block locking mechanisms that realize the deployment of the vehicle radar antenna in place include electric/hydraulic direct drive cylindrical latch locking mechanism, electric/hydraulic direct drive conical pull pin locking mechanism, electric/hydraulic four-bar locking mechanism, etc. Usually, the locking mechanism has three basic sub-functions: locking action execution, locked state maintenance, and locked state release. The three basic sub-functions are important links to be considered in the design, and the efficient, reliable and stable maintenance of the locked state is particularly important. The essential.

Electric/hydraulic direct drive cylindrical bolt locking mechanism (a small servo motor drives the gear to drive the sliding screw and pushes the cylindrical bolt or a small ordinary hydraulic cylinder pushes the cylindrical bolt through the piston rod) in the process of maintaining the locked state, the matching clearance between the cylindrical bolt and the pin hole As a result, the relative positions of the two blocks are uncertain, and the relative positions of the two blocks cannot be accurately positioned, resulting in aggravating the adverse effect of the variable wind load on the accuracy of the antenna array.

For the electric/hydraulic direct-drive conical pull-pin locking mechanism (a small servo motor drives the gear to drive the sliding screw and pulls the conical pull-pin or a small ordinary hydraulic cylinder pulls the conical pull-pin through the piston rod), the former slides when the locked state is released. The maximum static friction force of the system that the screw needs to overcome is large, and it is prone to the phenomenon that the lock state is released unevenly (that is, the screw crawls) and the instantaneous current of the motor is too large, and there are still problems that the power ratio per unit weight and the power ratio per unit size are too large. . The use of a small common hydraulic cylinder to pull the conical pull pin through the piston rod avoids the problem that the power ratio per unit weight and the power ratio per unit size are too large; however, in the process of maintaining the locked state of the mechanism, the double-acting hydraulic cylinder needs to continue to provide stability. Even if the spring restoring force of the single-acting hydraulic cylinder is used to maintain the locked state, when the antenna side block is affected by the fluctuating wind load, the spring restoring force may still be sufficient. fluctuations, which in turn affects the profile accuracy of the antenna.

Using the electro/hydraulic four-bar locking mechanism (ie crank-slider mechanism, the rotation of the crank is pushed by the motor or hydraulic cylinder, and the slider drives the tapered pull pin), the dead point of the four-bar mechanism can be efficiently and stably carried out The locked state is maintained, and the mechanism can significantly reduce the energy consumption of the actuator when the locking action is performed and the locked state is released; however, the mechanism occupies too much antenna space and has a complex structure, which still does not meet the lightweight of the vehicle radar antenna array. Flaws with compact design principles.

Therefore, it is urgent to design a mechanism with simple structure, high positioning accuracy, fast response of locking action execution and locking state release, low energy consumption, and efficient, reliable and stable locking state to ensure the front surface accuracy of the foldable radar antenna. , to improve the reliability of radar antenna detection accuracy.

SUMMARY OF THE INVENTION

The purpose of the present invention is to overcome the shortcomings of the prior art, and to provide a cam locking mechanism with self-locking function, which is simple and compact in structure, small in space ratio, high in positioning accuracy, fast in response speed, stable and reliable.

The object of the present invention is achieved through the following technical solutions: a cam locking mechanism with self-locking function, comprising a long bottom plate, a support is provided on the upper surface of the left side of the long bottom plate, and a lug is provided on the upper surface of the right side of the long bottom plate; the The support has a vertical through cavity, the through cavity is provided with a vertical shaft that can move up and down, the upper end of the vertical shaft extends out of the through cavity and a top plate is provided at the upper end; the outer surface of the support is provided with There is a rotatable cam, when the cam rotates, its edge touches the lower surface of the top plate to drive the vertical shaft to move up and down;

The support lug is hinged with the bottom of the hydraulic cylinder, the 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, and the through cavity penetrates the long bottom plate and the locking block and forms a conical wide opening at the locking block.

Preferably, the bottom of the vertical shaft is in the shape of a cone adapted to the conical wide opening of the through cavity, the middle part is in the shape of a stepped shaft, and the middle part is sleeved with a spring; the through cavity connects the upper cavity opening through the cover plate. It is sealed and the spring rests on the stepped shoulder of the cover plate and the vertical shaft.

Preferably, the support is provided with two symmetrical cams, and the piston rod is respectively hinged with the two cams through a gantry-shaped connecting body.

Further, the long bottom plate is installed and fixed on the antenna middle block, and the locking block is installed and fixed on the antenna side block.

The present invention has the following advantages:

(1) Compared with the common locking mechanism, the positioning accuracy of the relative positions of the two side blocks is not high, the response of the mechanism locking action execution or release is slow and unstable, the energy consumption required to maintain the locked state of the side blocks is high and unstable, and the space occupies The solution is simple and compact in structure, small in space ratio, high in positioning accuracy, fast and stable in response to the execution or release of the locking action, and the locked state can be efficiently, stable and reliable under complex working conditions for a long time. Maintain, the mechanism manufacturing process is good;

(2) And the precision of maintaining the profile of the vehicle-mounted radar antenna array after it is unfolded can be reliably guaranteed, which saves the effective design space of the antenna array and improves the robust detection of the foldable radar antenna array under harsh conditions. It provides important reference ideas and engineering examples for the design of the radar antenna side block locking mechanism.

Description of drawings

Fig. 1 is the structural schematic diagram of the present invention;

Fig. 2 is a cross-sectional rear view of the left side in Fig. 1;

FIG. 3 is a schematic structural diagram of the present invention;

In the picture: In the picture: 1-long bottom plate, 2-support, 3-support lug, 4-through cavity, 5-vertical shaft, 6-top plate, 7-cam, 8-hydraulic cylinder, 801-piston rod, 9 - Locking block, 10-spring, 11-cover, 12-connector.

Detailed ways

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

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

Specifically, in this solution, on the support 2, a vertical through cavity 4 is opened along the up-down direction, and a vertical shaft 5 is placed in the through cavity 4. The upper cavity opening of the through cavity 4 is sealed by the cover plate 11, and the vertical The shaft 5 is in the shape of a small and large stepped shaft and its small diameter shaft passes through the cover plate 11. A spring 10 is sleeved on the vertical shaft 5. on the surface. When the vertical shaft 5 moves upward, it can be reset downward under the action of the spring 10 to realize the up-and-down reciprocating action of the vertical shaft 5 .

Further, a top plate 6 is coaxially provided at the end of the vertical shaft 5 extending out of the cover plate 11 , and the top plate 6 is fixed and tightened on the vertical shaft 5 by nuts, and the upper end of the vertical shaft 5 is provided with a corresponding external thread. A rotatable cam 7 is arranged on the outer surface of the support 2, the cam 7 rotates eccentrically along the vertical plane, and the edge of the cam 7 is in contact with the bottom surface of the top plate 6, that is, when the cam 7 rotates, the edge of the cam 7 that is farther from the center When the cam 7 is in contact with the top plate 6, the top plate 6 is lifted up. When the edge of the cam 7 closer to the center is in contact with the top plate 6, under the action of the spring 10, the top plate 6 moves downward. The top plate 6 and the vertical shaft 5 are fixed and integrated. When the top plate 6 moves up and down, the vertical shaft 5 moves together.

In this scheme, in order to realize the rotation of the cam 7, in this scheme, the bottom of the hydraulic cylinder 8 of the lug 3 is hinged, and the piston rod 801 of the hydraulic cylinder 8 is eccentrically hinged on the cam 7, and the hydraulic cylinder 8 passes through the piston when the oil is fed. The rod 601 pushes the cam 7 to the left, and when the hydraulic cylinder 8 is out of oil, the cam 7 is pulled to the right through the piston rod 801 to realize the rotation of the cam.

Since the cam 7 and the top plate 6 are in separable contact, that is, when the cam 7 exerts an upward force on the top plate 6, the upward movement distance of the vertical shaft 5 is unknown, in order to ensure the upward movement of the vertical shaft 5. The lower cavity mouth of the through cavity 4 is in the shape of a conical wide mouth, and the bottom end of the vertical shaft 5 is in the shape of a cone adapted to it.

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 of the through cavity 4 is located in the locking block 9 .

In order to ensure that the force of the cam 7 on the top plate 6 can be balanced, two symmetrical cams 7 are provided on the side of the support 2 , and the piston rod 801 is hinged to the two cams 7 respectively through the gantry-shaped connecting body 12 .

In this embodiment, when the cam 7 lifts the top plate 6, as shown in FIG. 1, the edge of the upper left is arc-shaped, and the edge of the lower right is a right angle; the right angle is hinged with the hinge shaft and the bearing and the support 2, The upper edge is in contact with the bottom plate 6 and pushes it up, 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 working, the output member of the four-bar mechanism - cam 7 is used as the power source of the flat-bottom driven cam mechanism, and the hydraulic pressure is amplified and reversed by the four-bar mechanism. The vertical shaft 5 and the vertical shaft 5 are subjected to the forces of the cam 7, the spring 10 and the through cavity 4 as a component, and the contact surface between the through cavity 4 and the vertical shaft 5 constitutes a cylinder pair) to give the vertical shaft 5 the freedom of movement and rotation, and finally realizes the cam The rotational displacement is converted into the linear displacement of the vertical shaft 5, and the bottom end conical surface of the vertical shaft 5 and the conical surface of the locking block 9 are separated and combined through the up and down movement of the vertical shaft 5; at the same time, the actual position of the cam 7 is at Within a certain angle range, the hydraulic cylinder 8 will remove the oil pressure, and the interaction force between the top plate 6, the contour of the cam 7, and the through cavity 5 will form a frictional self-locking effect, so as to achieve an efficient and stable combination state between the conical positioning surfaces. It can ensure the close fit between the cone surfaces, thereby ensuring high-precision positioning between the two antenna side blocks; the hydraulic cylinder 8 applies oil pressure again, and under the force of the piston rod 801 and the spring 10, the separation between the positioning cone surfaces is realized; Finally, the locking and separation of the two antenna side blocks are successfully completed.

In this scheme, the long bottom plate 1 is installed and fixed on the antenna middle block, and the locking block 9 is installed and fixed on the antenna side block; when locking the antenna, the cam 7 is driven by the oil cylinder 8 to drive the pin shaft 5 to move, and the tapered surface The pin shaft 5 cooperates with the locking block 9 to lock the middle block and the side block of the antenna.

Claims (7)

1. A cam locking mechanism with self-locking function, characterized in that it comprises a long bottom plate (1), a support (2) is provided on the upper surface of the left side of the long bottom plate (1), and a support (2) is provided on the upper surface of the right side of the long bottom plate (1). A support lug (3) is provided; The support (2) is provided with a vertical through cavity (4), a vertical shaft (5) capable of moving up and down is arranged in the through cavity (4), and the upper end of the vertical shaft (5) extends out of the through cavity (4) A top plate (6) is provided outside and at the upper end; A rotatable cam (7) is provided on the outer surface of the support (2), and when the cam (7) rotates, its edge abuts on the lower surface of the top plate (6) to drive the vertical shaft (5) to move up and down; The support lug (3) is hinged with the bottom of the hydraulic cylinder (8), the piston rod (801) of the hydraulic cylinder (8) is eccentrically hinged on the cam (7), and the telescopic action of the piston rod (801) drives the cam (7) turn. 2. A cam locking mechanism with self-locking function according to claim 1, characterized in that: the long bottom plate (1) is fixed on the locking block (9), and the through cavity (4) connects the long bottom plate (1). 1) penetrates through the locking block (9) and forms a conical wide-mouth shape at the locking block (9). 3. A cam locking mechanism with self-locking function according to claim 2, characterized in that: the bottom of the vertical shaft (5) is in the shape of a cone adapted to the conical wide opening of the through cavity (4). Body shape, the middle part is in the shape of a stepped shaft and the middle part is sleeved with a spring (10); The through cavity (4) seals the upper cavity opening through the cover plate (11), and the spring (10) abuts on the cover plate (11) and the stepped shoulder of the vertical shaft (5). 4. A cam locking mechanism with self-locking function according to claim 3, characterized in that: the support (2) is provided with two symmetrical cams (7), and the piston rod (801) passes through The gantry-shaped connecting bodies (12) are respectively hinged with the two cams (7). 5 . The cam locking mechanism with self-locking function according to claim 4 , wherein a backing plate is arranged between the long bottom plate ( 1 ) and the locking block ( 9 ), and a backing plate is arranged between the long bottom plate ( 1 ) and the locking block ( 9 ). Connect the three to the bottom. 6 . The cam locking mechanism with self-locking function according to claim 5 , wherein the support lugs ( 3 ) are double lugs, and a connecting plate is fixed on the bottom of the hydraulic cylinder ( 8 ). A connecting hole is opened on the upper part, and a pin shaft is pierced through the ear hole of the support lug (3) and the connecting hole of the connecting plate to realize the hinged connection between the two. 7. A cam locking mechanism with self-locking function according to claim 6, characterized in that: the long bottom plate (1) is installed and fixed on the antenna middle block, and the locking block (9) is installed and fixed on the antenna On the side block, the pin shaft (5) with a tapered surface cooperates with the locking block (9) to lock the antenna middle block and the side block.

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