A cam locking mechanism with self-locking function

Abstract

The present invention relates to a cam locking mechanism with a 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 support ear is provided 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 up and down displacement is provided in the through cavity, the upper end of the vertical shaft extends out of the through cavity and a top plate is provided at the upper end; a rotatable cam is provided on the outer surface of the support, and when the cam rotates, its edge abuts against the lower surface of the top plate to drive the vertical shaft to move up and down; the support ear is hinged to the bottom of the hydraulic cylinder, and the piston rod of the hydraulic cylinder is eccentrically hinged to the cam, and the telescopic action of the piston rod drives the cam to rotate. The beneficial effects achieved by the present invention are: simple and compact structure, small space occupation, high positioning accuracy, fast response speed, and stable and reliable.

Description

Technical Field

[0001] 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 Art

[0002] In order to meet the requirements of rapid installation and withdrawal and improve tactical mobility, large-caliber vehicle-mounted radar antennas are usually processed into a foldable form. Among them, the automatic locking mechanism after the antenna edge block is deployed is a key device, and its locking performance has an important impact on the repeatability of each edge block and the accuracy of the antenna surface under harsh working conditions.

[0003] Common side block locking mechanisms for the vehicle-mounted radar antenna after it is deployed include electric / hydraulic direct-drive cylindrical pin locking mechanism, electric / hydraulic direct-drive conical pin locking mechanism, electric / hydraulic four-bar locking mechanism, etc. Usually, the locking mechanism has three basic sub-functions: locking action execution, locking state maintenance, and locking state release. The three basic sub-functions are important links that need to be considered during design, and efficient, reliable, and stable maintenance of the locking state is particularly critical.

[0004] In the process of maintaining the locked state of the electric / hydraulic direct-drive cylindrical latch locking mechanism (a small servo motor drives the gear to drive the sliding screw and push the cylindrical latch, or a small ordinary hydraulic cylinder pushes the cylindrical latch through the piston rod), the matching clearance between the cylindrical latch and the pin hole will cause the relative position of the two side blocks to be uncertain, and the relative position of the two side blocks cannot be accurately positioned effectively, causing the antenna array accuracy to be aggravated by the adverse effects of variable wind loads.

[0005] For the electric / hydraulic direct-drive cone pin locking mechanism (a small servo motor drives the gear to drive the sliding screw and pull the cone pin or a small ordinary hydraulic cylinder pulls the cone pin through the piston rod), when the former is released from the locked state, the sliding screw needs to overcome a large maximum static friction of the system, which is prone to unstable release of the locked state (i.e., screw creep) and excessive instantaneous current of the motor, and there are still problems of large power-to-weight ratio and power-to-size ratio. The method of using a small ordinary hydraulic cylinder to pull the cone pin through the piston rod avoids the problem of large power-to-weight ratio and power-to-size ratio; however, in the process of maintaining the locked state, the mechanism requires a double-acting hydraulic cylinder to continuously provide a stable hydraulic pressure, which will lead to serious energy consumption problems. Even if the spring restoring force of the single-acting hydraulic cylinder is used to maintain the locked state, when the antenna edge block is affected by the changing wind load, the restoring force of the spring may still fluctuate sufficiently, thereby affecting the surface accuracy of the antenna.

[0006] An electric / hydraulic four-bar locking mechanism (i.e., a crank slider mechanism, in which the rotation of the crank is driven by a motor or a hydraulic cylinder, and the slider drives the conical pull pin) is adopted. The locking state can be maintained efficiently and stably through the dead point of the four-bar mechanism, and the mechanism can significantly reduce the energy consumption of the actuator when the locking action is executed and the locking state is released; however, the mechanism occupies too much antenna space and has a complex structure, and there is still a defect that it does not conform to the design principles of lightweight and compact structure of the vehicle-mounted radar antenna array.

[0007] Therefore, it is urgent to design a mechanism with simple structure, high positioning accuracy, fast response to locking action execution and locking state release, low energy consumption, and efficient, reliable and stable locking state maintenance to ensure the array accuracy of the foldable radar antenna and improve the reliability of the radar antenna detection accuracy. Summary of the invention

[0008] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a cam locking mechanism with a self-locking function that has a simple and compact structure, occupies a small space, has high positioning accuracy, fast response speed, and is stable and reliable.

[0009] The object of the present invention is achieved through the following technical solutions: a cam locking mechanism with a 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 support ear is provided 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 up and down displacement is provided in the through cavity, the upper end of the vertical shaft extends out of the through cavity and a top plate is provided at the upper end; a rotatable cam is provided on the outer surface of the support, and when the cam rotates, its edge abuts against the lower surface of the top plate, thereby driving the vertical shaft to move up and down;

[0010] The support ear is hinged to the bottom of the hydraulic cylinder, and the piston rod of the hydraulic cylinder is eccentrically hinged to the cam, and the telescopic action of the piston rod drives the cam to rotate.

[0011] Furthermore, 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 tapered wide mouth shape at the locking block.

[0012] Preferably, the bottom of the vertical shaft is in the shape of a cone that fits the tapered wide mouth of the through cavity, the middle part is in the shape of a stepped shaft and a spring is sleeved in the middle; the through cavity seals the upper cavity mouth through the cover plate, and the spring rests on the stepped shoulders of the cover plate and the vertical shaft.

[0013] Preferably, two symmetrical cams are arranged on the support, and the piston rod is hinged to the two cams respectively through a gantry-shaped connector.

[0014] Furthermore, the long bottom plate is fixedly mounted on the antenna middle block, and the locking block is fixedly mounted on the antenna side block, and the antenna middle block and the side block are locked by the cooperation between the vertical shaft with the conical surface and the locking block.

[0015] The present invention has the following advantages:

[0016] (1) Compared with the common locking mechanism, the positioning accuracy of the relative position of the two side blocks is not high, the response of the locking action of the mechanism is slow and unstable, the energy consumption required to maintain the locking state of the side blocks is high and unstable, and the space occupies a large area. The present scheme has a simple and compact structure, a small space occupancy, high positioning accuracy, a fast and stable response speed for the locking action to be executed or released, and the locking state can be maintained efficiently, stably and reliably for a long time under complex working conditions. The manufacturing process of the mechanism is good;

[0017] (2) The surface accuracy of the vehicle-mounted radar antenna array after unfolding is reliably guaranteed, which saves the effective design space of the antenna array, improves the robust detection capability of the foldable radar antenna array under harsh working conditions, and provides important reference ideas and engineering examples for the design of the radar antenna edge block locking mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the present invention;

[0019] Figure 2 for Figure 1 The schematic diagram of the structure after sectioning on the left side of the middle;

[0020] Figure 3 It is a schematic diagram of the structure of the present invention from a top view;

[0021] In the figure: In the figure: 1-long bottom plate, 2-support, 3-support ear, 4-through cavity, 5-vertical axis, 6-top plate, 7-cam, 8-hydraulic cylinder, 801-piston rod, 9-locking block, 10-spring, 11-cover plate, 12-connector. DETAILED DESCRIPTION

[0022] The present invention is further described below in conjunction with the accompanying drawings, but the protection scope of the present invention is not limited to the following description.

[0023] like Figure 1~Figure 3 As shown, a cam locking mechanism with a self-locking function 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. A vertical shaft 5 capable of moving up and down is provided on the support 2, and a driving mechanism is provided on the support ear 3, and the driving mechanism drives the vertical shaft 5 to move up and down.

[0024] Specifically, in this solution, a vertical through cavity 4 is opened in the vertical direction on the support 2, a vertical shaft 5 is placed in the through cavity 4, the upper cavity opening of the through cavity 4 is sealed by a cover plate 11, the vertical shaft 5 is in the shape of a stepped shaft with a small diameter and a small diameter shaft passing through the cover plate 11, a spring 10 is sleeved on the vertical shaft 5, the lower end of the spring 10 abuts on the stepped shoulder and the upper end abuts on the lower surface of the cover plate 11. When the vertical shaft 5 moves upward, it can be reset downward under the action of the spring 10, so that the vertical shaft 5 can reciprocate up and down.

[0025] Furthermore, a top plate 6 is coaxially arranged 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 a nut, and a corresponding external thread is opened on the upper end of the vertical shaft 5. A rotatable cam 7 is arranged on the outer side of the support 2, and the cam 7 rotates eccentrically along the vertical plane, and the edge of the cam 7 contacts the bottom surface of the top plate 6, that is, when the cam 7 rotates, when the edge of the cam 7 farther from the center contacts the top plate 6, the top plate 6 is lifted up, and when the edge of the cam 7 closer to the center contacts the top plate 6, the top plate 6 moves downward under the action of the spring 10. The top plate 6 and the vertical shaft 5 are fixed as one, and when the top plate 6 moves up and down, the vertical shaft 5 moves together.

[0026] In order to realize the rotation of cam 7 in this scheme, the bottom of hydraulic cylinder 8 of support ear 3 is hinged, and the piston rod 801 of hydraulic cylinder 8 is eccentrically hinged on cam 7. When hydraulic cylinder 8 is taking in oil, it pushes cam 7 to the left through piston rod 601. When hydraulic cylinder 8 is discharging oil, it pulls cam 7 to the right through piston rod 801, thereby realizing the rotation of cam.

[0027] Since the cam 7 and the top plate 6 are in detachable contact, that is, when the cam 7 applies an upward force to the top plate 6, the distance that the vertical shaft 5 moves upward is unknown, in order to ensure the upward movement of the vertical shaft 5. The lower cavity opening of the through cavity 4 is in a conical wide mouth shape, and the bottom end of the vertical shaft 5 is in a cone shape adapted thereto.

[0028] In this embodiment, the long bottom plate 1 is fixed on the locking block 9 , and the through cavity 4 passes through the long bottom plate 1 and the locking block 9 , and the tapered wide mouth of the through cavity 4 is located in the locking block 9 .

[0029] In order to ensure that the force of the cam 7 on the top plate 6 is balanced, two symmetrical cams 7 are arranged on the side of the support 2, and the piston rod 801 is hinged to the two cams 7 respectively through a gantry-shaped connecting body 12.

[0030] In this embodiment, when the cam 7 lifts the top plate 6, Figure 1 As shown, the edge of the upper left part is arc-shaped, and the edge of the lower right part is right-angled; the right angle is hinged to the support 2 through the hinge shaft and the bearing, the upper edge contacts the bottom plate 6 and lifts it up, the cam 7 at the right side position near the left edge is hinged to the left end of the connecting body 12, and the right end of the connecting body 12 is fixedly connected to the piston rod 801.

[0031] When working, the output component of the four-bar mechanism, cam 7, is used as the power source of the flat bottom driven cam mechanism and the four-bar mechanism is used to amplify and reverse the hydraulic pressure. The cam 7 transmits the force to the top plate 6 by swinging. The top plate and the vertical shaft 5 are subjected to the force of the cam 7, the spring 10 and the through cavity 4 as a component. The contact surface of the through cavity 4 and the vertical shaft 5 forms a cylindrical pair to give the vertical shaft 5 the freedom of movement and rotation, and finally realize the conversion of the cam rotation displacement into the linear displacement of the vertical shaft 5. The vertical shaft 5 is moved up and down to realize the circular contact between the bottom conical surface of the vertical shaft 5 and the locking block 9. Separation and combination of the conical surfaces; at the same time, when the cam 7 actually runs into position within a certain angle range, the hydraulic cylinder 8 will remove the oil pressure, and rely on the interaction force between the top plate 6, the contour of the cam 7, and the through cavity 5 to form a friction self-locking effect, thereby achieving an efficient and stable combination state between the conical positioning surfaces, which can ensure a close fit between the conical surfaces, thereby ensuring high-precision positioning between the two antenna side blocks; the hydraulic cylinder 8 applies oil pressure again, and under the action of the piston rod 801 and the spring 10, the separation between the positioning cone surfaces is achieved; and finally the locking and separation of the two antenna side blocks are successfully completed.

[0032] In this solution, the long base 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 cylinder 8 to drive the vertical shaft 5 to move, and the vertical shaft 5 with a conical surface cooperates with the locking block 9 to lock the antenna middle block and the 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 arranged on the left upper surface of the long bottom plate (1), and a support ear (3) is arranged 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 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); the piston rod (801) of the hydraulic cylinder (8) is eccentrically hinged to the cam (7); 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 self-locking function according to claim 1, characterized in that: The support (2) is provided with two symmetrical cams (7), and the piston rod (801) is hingedly connected to the two cams (7) respectively through a gantry-shaped connecting body (12).

3. A cam locking mechanism with self-locking function according to claim 2, characterized in that: The supporting ears (3) are double ears, 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 supporting ear (3) and the connecting hole of the connecting plate to realize the hinge connection between the two.

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