Auxiliary device for calibrating visual axis of image seeker

Abstract

The invention belongs to the technical field of intelligent ammunition, and relates to an image seeker visual axis calibration auxiliary device which comprises a supporting platform assembly, a high-precision linear sliding rail assembly, a coaxial adjustable support assembly, a coaxial rolling support assembly, an adjustable calibration disc assembly and a calibration sample column. The supporting platform assembly is composed of a bearing flat plate, a plurality of metering platforms and a supporting longitudinal beam. The high-precision linear sliding rail assembly is composed of a high-precision linear sliding rail, a wheel heavy-load sliding block A and a wheel heavy-load sliding block B which are matched. The coaxial adjustable support assembly is composed of a first support, an adjusting seat and a double-column adjusting block. The coaxial rolling support assembly is composed of a second support, a bearing rotating shaft and a glue sealing deep groove bearing. Before the auxiliary device is used, the calibration sample column of the auxiliary device is used for completing coaxial calibration on the device rack, then a carrier fixedly connected with the image seeker to be calibrated is placed on the device rack, and the visual axis pointing calibration process of the television image seeker can be completed by simply operating the upper computer.

Description

Technical Field

[0001] The invention relates to the technical field of intelligent ammunition, and in particular to an auxiliary device for calibrating the visual axis of an image seeker. Background Art

[0002] The image seeker is an important component of image matching guided weapons. Its main function is to complete the autonomous identification, measurement, capture and tracking of the target, and then control the flight of the ammunition and attack the target. The image seeker is installed at the front end of the ammunition in a fixed manner. In order to achieve reliable and high-precision target tracking, its boresight pointing is particularly important. However, due to structural processing, assembly accuracy, coaxiality after cabin docking and image seeker adjustment accuracy, geometric errors between the axis systems of the image seeker will be caused, which will seriously affect the accurate pointing of the zero position boresight of the image seeker, and the boresight pointing is the most important factor affecting the accuracy of the miss distance.

[0003] The existing calibration platform uses a 2-axis or 3-axis turntable to clamp the front cabin section of the carrier fixed with the image seeker through three clamping arms of the intermediate axis to calibrate the television image seeker. This calibration using a turntable takes up space, has a large amount of repeated clamping, and has a high platform cost.

[0004] A domestic invention discloses a method for calibrating the assembly error of a fully strapdown imaging image seeker and a carrier, which uses the carrier posture and parallel light imaging to complete the calibration. Another invention discloses three strapdown imaging image seeker calibration methods. Method one is to calibrate the carrier and the image seeker together, using the on-board inertial navigation data and a total station with a north compass to calibrate the internal and external parameters and aberration coefficients; method two is to calibrate the image seeker independently, using the manufactured calibration auxiliary device and the total station to calibrate the internal and external parameters and aberration coefficients; method three is to use a calibrated image seeker, and calibrate the internal and external parameters through an image seeker and a collimator with known internal and external parameters. The above methods are relatively costly. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide an image seeker visual axis calibration auxiliary device which is simple to operate, easy to use, conducive to mass production, low-cost and can calibrate the visual axis more quickly.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is: An image seeker visual axis calibration auxiliary device comprises: a support platform assembly, a high-precision linear slide assembly, a coaxial adjustable bracket assembly, a coaxial rolling bracket assembly, an adjustable calibration plate assembly and a calibration sample column; The support platform assembly is composed of a bearing plate, a plurality of metering platforms and a supporting longitudinal beam; the metering platforms and the supporting longitudinal beam are respectively located on the upper surface and the lower surface of the bearing plate, and are fixedly connected to the bearing plate; The high-precision linear slide assembly is composed of an adapted high-precision linear slide, a wheel heavy-load slider A and a wheel heavy-load slider B; the high-precision linear slide is longitudinally arranged on the upper surface of the bearing plate and fixedly connected; The coaxial adjustable bracket assembly is composed of a No. 1 bracket, an adjustment seat and a double-column adjustment block; the No. 1 bracket is fixed on the wheel load slider A, the adjustment seat is arranged on the top of the No. 1 bracket and can be adjusted horizontally left and right, and the double-column adjustment block is arranged on the adjustment seat and can be adjusted up and down; The coaxial rolling bracket assembly is composed of a No. 2 bracket, a bearing shaft and a rubber-sealed deep groove bearing; the No. 2 bracket is fixed on the wheel heavy-load slider B, and the wheel heavy-load slider B is located outside the wheel heavy-load slider A; at least two rubber-sealed deep groove bearings are arranged on both sides of the top of the No. 2 bracket; The adjustable calibration disk assembly consists of a calibration disk, a disk fixing grip, an adjustable pillar, a support ear and a coaxial cylinder; the coaxial cylinder is arranged at the center of the calibration disk, the calibration disk is fixedly connected to the adjustable pillar through the disk fixing grip and the support ear, the adjustable pillar is fixedly connected to the load-bearing plate, and the adjustable pillar is located on a side away from the coaxial rolling bracket assembly.

[0007] Furthermore, there are six metering platforms, which are arranged in pairs on both sides of the supporting plate.

[0008] The No. 1 bracket and the No. 2 bracket are Y-shaped, the adjustable support and the support ear are T-shaped, and there are four support ears, which are grouped in pairs to form two L-shaped brackets.

[0009] The side of the calibration disk facing the calibration sample column is an observation surface, and the other side thereof is a fixing surface, and reinforcing ribs are arranged on the fixing surface.

[0010] Compared with the prior art, the beneficial effects of the present invention are: 1) The auxiliary device has a lightweight design, compact structure and small space occupation; 2) High coaxiality, which makes the coaxial calibration of the auxiliary TV image seeker faster and more accurate; 3) Simple operation, easy to use, and manpower saving; 4) It fully integrates the ideas of generalization, serialization and modularization, has high scalability, high reusability, low cost and high cost-effectiveness.

[0011] The auxiliary device can not only calibrate the entire cabin of the fixed-attached image guidance head, but also eliminates the need to repeat the clamping operation for each cabin when in use. Before use, it is only necessary to use the calibration sample column of the auxiliary device to complete the coaxial calibration of the device stand, and then place the carrier of the fixed-attached image guidance head to be calibrated on the device stand, and simply operate the host computer to complete the visual axis pointing calibration process of the television image guidance head. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a structural schematic diagram of an image seeker visual axis calibration auxiliary device of the present invention; Figure 2 for Figure 1 A top view of Figure 3 for Figure 1 Top view of the uncalibrated sample column; Figure 4 for Figure 1 AA section view; Figure 5 for Figure 1 Left view of Figure 6 for Figure 1 3D view of Figure 7 This is a schematic diagram of the structure of the fixing surface of the calibration disk of the present invention; Figure 8 for Figure 1 3D view without calibration column; Fig. 9 The 3D view is fixed for the disk according to the present invention. DETAILED DESCRIPTION

[0013] The following is a detailed description of an image seeker visual axis calibration auxiliary device of the present invention in conjunction with the accompanying drawings.

[0014] Reference Figure 1-9 As shown, an image seeker visual axis calibration auxiliary device includes: a support platform assembly 100, a high-precision linear slide rail assembly 200, a coaxial adjustable bracket assembly 300, a coaxial rolling bracket assembly 400, an adjustable calibration disk assembly 500 and a calibration sample column 600.

[0015] like Figure 2 and Figure 6 As shown, the support platform assembly is composed of a bearing plate 101, a plurality of metering platforms 102 and a supporting longitudinal beam 103. The metering platforms and the supporting longitudinal beams are respectively located on the upper surface and the lower surface of the bearing plate and are fixedly connected to the bearing plate.

[0016] like Figure 3 and Figure 4 As shown, the high-precision linear guide rail assembly is composed of an adapted high-precision linear guide rail 201, a wheel heavy-load slider A 202 and a wheel heavy-load slider B 203. The high-precision linear guide rail is longitudinally arranged on the upper surface of the bearing plate and fixedly connected.

[0017] like Figure 4 and Figure 6 , Figure 8As shown, the coaxial adjustable bracket assembly consists of a bracket No. 1 301, an adjustment seat 302 and a double-column adjustment block 303; the bracket No. 1 is fixed on the wheel load slider A 202, the adjustment seat is arranged on the top of the bracket No. 1 and can be adjusted horizontally left and right, and the double-column adjustment block is arranged on the adjustment seat and can be adjusted up and down.

[0018] The coaxial rolling bracket assembly consists of a No. 2 bracket 401, a bearing shaft 402 and a rubber-sealed deep groove bearing 403; the No. 2 bracket is fixed on the wheel heavy-load slider B, and the wheel heavy-load slider B is located outside the wheel heavy-load slider A; at least two rubber-sealed deep groove bearings are arranged on both sides of the top of the No. 2 bracket.

[0019] like Figure 6 and Figure 7 As shown, the adjustable calibration plate assembly consists of a calibration plate 501, a plate fixing catch 502, an adjustable support column 503, a support ear 504 and a coaxial cylinder 505. The coaxial cylinder is arranged at the center of the calibration plate, the calibration plate is fixedly connected to the adjustable support column through the plate fixing catch and the support ear, the adjustable support column is fixedly connected to the bearing plate, and the adjustable support column is located on a side away from the coaxial rolling support assembly.

[0020] In one embodiment of the present invention, there are six metering platforms, which are arranged on both sides of the load-bearing plate in pairs, and there are two supporting longitudinal beams. Bracket No. 1 and Bracket No. 2 are Y-shaped, and the adjustable support and lugs are T-shaped. There are four lugs, which are grouped in pairs to form two L-shaped brackets. The side of the calibration disk facing the calibration sample column is the observation surface, and the corresponding other side is the fixed surface, and reinforcing ribs are provided on the fixed surface.

[0021] The load-bearing plate is a flat aluminum plate with typical dimensions of length × width × thickness: 1750 × 360 × 20 mm.

[0022] The meter platform is made of alloy steel, with typical dimensions of length × width × thickness: 100 × 60 × 10 mm.

[0023] The supporting longitudinal beam is galvanized channel steel, typical model No. 6; other profiles, such as metal rectangular tubes and aluminum profiles, can also be used as long as the stiffness and strength meet the requirements.

[0024] High-precision linear guides and wheel heavy-duty sliders A and B are selected and matched according to the weight they carry. The load-bearing method is horizontal load-bearing, which is better than vertical load-bearing. Select a load-bearing margin coefficient of 1.5 to 2 times. The high-precision linear guide is an external dual-axis structure with a typical cross-sectional size of width × height: 36 × 25.5mm. It has excellent rigidity and strength and can ensure straightness and coaxiality; two wheel heavy-duty sliders, with typical dimensions of length × width × height: 100 × 82 × 35mm, and a load-bearing capacity of 40kg / slider. The combined use can not only ensure the stability and coaxiality of the bracket, but also reduce space occupancy.

[0025] The Y-shaped brackets No. 1 and No. 2 are made of alloy steel, with dimensions of width × height × thickness: 200 × 200 × 30 mm. The matching structure with the slider adopts a semi-rectangular structure, which is easy to position and stable. The interface with the bearing part adopts two embedded rubber-sealed deep groove bearings with matching angles to facilitate the rolling operation of the bearing part. The threaded holes on the platforms on both sides of the No. 1 bracket are reserved for the installation of expansion parts, which is convenient for functional expansion and combination.

[0026] The adjustment seat is made of alloy steel, with dimensions of width × height × thickness: 210 × 45 × 30 mm. Semicircular notches are set on the platforms at both ends to match the Y-shaped bracket for horizontal adjustment. The eccentric screw 304 at the bottom can realize the up and down adjustment of the double-column adjustment block.

[0027] The double-column adjustment block is made of alloy steel, with dimensions of width × height × thickness: 48 × 32 × 20 mm. There is a semi-cylinder on each side of the width, which serves as a limit guide for upward and downward sliding. There is a blind hole at the bottom, and the eccentric screw 304 at the bottom serves as a limit when adjusting.

[0028] The bearing shaft is made of alloy steel, with a size of φ10×24.

[0029] The calibration plate is a flat aluminum plate with dimensions of diameter × thickness: φ450 × 10mm. The observation surface is flat, and the fixed surface has 8 rounded fan-shaped grooves to form a grid reinforcement configuration. The grooves are for weight reduction, and the reinforcement ribs are for fixing the plate. The inner shape is designed to be symmetrical in center, and the position can be interchanged at will.

[0030] Reference Fig. 9 The plate fixing grip is made of alloy steel, with an 8-grip cylindrical cavity. There is a rounded rectangular boss with guide grooves on both sides in the center of the cylindrical cavity. The guide grooves play a role in limiting and guiding when adjusting up and down. There are threaded holes on both sides of the boss for screws to adjust up and down. The overall structure is symmetrically designed to avoid error installation.

[0031] The T-shaped adjustable support is made of alloy steel and is an important part of the entire calibration plate. The rigidity and strength structure design ensures that it can bear the weight of the calibration plate and its accessories. The contact surface with the bearing plate is an integrated right-angle surface. The horizontal surface fits the plane of the bearing plate, and the vertical surface fits the end surface of the bearing plate. The three-point fixing holes used are rounded rectangles to facilitate horizontal adjustment of the position.

[0032] The T-shaped lugs are made of alloy steel. The combined T-shaped lugs expand the contact surface with the calibration disk, stabilize the calibration disk, and ensure that the calibration disk surface and the calibration sample column axis are perpendicular.

[0033] like Figure 3-Figure 6As shown, the high-precision linear guide is placed on the flat plate in the center on the left end and is tightened evenly with 10 standard fastening parts. Two heavy-duty wheel sliders slide in from either end of the guide. Two rubber-sealed deep groove bearings are respectively embedded in the bearing groove of the No. 2 bracket with bearing shafts, and then this bracket is fastened to the left heavy-duty wheel slider B with two standard fastening parts. The adjustment seat is fastened to the Y-type No. 1 bracket with two standard fastening parts, and the double-column adjustment block is pressed into the corresponding same-type slide groove of the adjustment seat with a standard fastening part, and this Y-type bracket is fastened to the right heavy-duty slider B with two standard fastening parts.

[0034] like Figure 7 As shown, the disk fixing grip is fastened to the fixed surface of the calibration disk with fan-shaped grooves with 8 fastening standard parts. The T-shaped adjustable pillar is fastened with 2 fastening standard parts in the vertical direction and fastened with fastening standard parts in the horizontal direction. The four T-shaped ears are divided into two groups and formed into an L shape with fastening standard parts, and then fastened to both sides of the T-shaped adjustable pillar with fastening standard parts. The calibration disk with disk fixing grip is limited with 4 fastening standard parts and the T-shaped adjustable pillar. The top of the T-shaped adjustable pillar is screwed into the fastening standard part to connect the disk fixing grip. The coaxial cylinder is fastened to the center position on the observation side of the calibration disk with 2 fastening standard parts. The fastening standard part is screwed into the bottom end of the T-shaped adjustable pillar, and the ears are screwed into the fastening standard part. At this point, the various groups of components of the auxiliary device are installed as a whole.

[0035] The use process of the image seeker visual axis calibration auxiliary device involved in the present invention is as follows: Before use, adjust the straight-line distance between the coaxial adjustable bracket assembly and the calibration disk to 1m, and the straight-line distance between the coaxial rolling bracket assembly and the coaxial adjustable bracket assembly to 0.6m.

[0036] Use the dial indicator on the measuring platforms on both sides of the bearing plate closest to the calibration disk, and move the meter head to ensure that the vertical surface runout of the calibration disk is no more than 0.05.

[0037] Then place the calibration sample column stably on the coaxial adjustable bracket assembly and the coaxial rolling bracket assembly, adjust the screws 305 on both sides of the adjustment seat in the coaxial adjustable bracket assembly to make the small diameter end of the calibration sample column extend into the coaxial cylinder, use a bench-type dial indicator to measure the calibration on the three measuring platforms on one side of the supporting plate, and rotate the calibration sample column on each measuring platform for at least one circle, and the circular runout is not greater than 0.03.

[0038] Remove the calibration sample column and place it upright in the display area, replace it with a calibration carrier with an image guide head, operate the host computer to give instructions to the image guide head, and use the position on the calibration disk presented by the image guide head's field of view to provide feedback to the calibration image guide head. After calibration, replace it with the next one to be calibrated until the work is completed.

[0039] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. An image seeker visual axis calibration auxiliary device, characterized in that: include: Support platform assembly, high-precision linear slide assembly, coaxial adjustable bracket assembly, coaxial rolling bracket assembly, adjustable calibration plate assembly and calibration sample column; The support platform assembly is composed of a bearing plate, a plurality of metering platforms and a supporting longitudinal beam; the metering platforms and the supporting longitudinal beam are respectively located on the upper surface and the lower surface of the bearing plate, and are fixedly connected to the bearing plate; The high-precision linear slide assembly is composed of an adapted high-precision linear slide, a wheel heavy-load slider A and a wheel heavy-load slider B; the high-precision linear slide is longitudinally arranged on the upper surface of the bearing plate and fixedly connected; The coaxial adjustable bracket assembly is composed of a No. 1 bracket, an adjustment seat and a double-column adjustment block; the No. 1 bracket is fixed on the wheel load slider A, the adjustment seat is arranged on the top of the No. 1 bracket and can be adjusted horizontally left and right, and the double-column adjustment block is arranged on the adjustment seat and can be adjusted up and down; The coaxial rolling bracket assembly is composed of a No. 2 bracket, a bearing shaft and a rubber-sealed deep groove bearing; the No. 2 bracket is fixed on the wheel heavy-load slider B, and the wheel heavy-load slider B is located outside the wheel heavy-load slider A; at least two rubber-sealed deep groove bearings are arranged on both sides of the top of the No. 2 bracket; The adjustable calibration disk assembly consists of a calibration disk, a disk fixing grip, an adjustable pillar, a support ear and a coaxial cylinder; the coaxial cylinder is arranged at the center of the calibration disk, the calibration disk is fixedly connected to the adjustable pillar through the disk fixing grip and the support ear, the adjustable pillar is fixedly connected to the load-bearing plate, and the adjustable pillar is located on a side away from the coaxial rolling bracket assembly.

2. The image seeker visual axis calibration auxiliary device according to claim 1, characterized in that: There are six metering platforms, which are arranged in pairs on both sides of the carrying plate.

3. The image seeker visual axis calibration auxiliary device according to claim 1, characterized in that: The No. 1 bracket and the No. 2 bracket are Y-shaped, the adjustable support and the support ear are T-shaped, and there are four support ears, which are grouped in pairs to form two L-shaped brackets.

4. The image seeker visual axis calibration auxiliary device according to claim 1, characterized in that: The side of the calibration disk facing the calibration sample column is an observation surface, and the other side thereof is a fixing surface, and reinforcing ribs are arranged on the fixing surface.

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