Camera parameter on-site calibration tool for overhead line geometry parameter detection system

Abstract

The utility model discloses a camera parameter field calibration tool for contact network geometry parameter detection system belongs to contact network geometry detection technical field, in order to solve the inconvenient problem of big carrying of existing field calibration tool quality, the camera parameter field calibration tool for contact network geometry parameter detection system includes bottom bar subassembly (1), top bar subassembly (2) and target subassembly (3), and top bar subassembly (2) contains the top bar main part (21) and the movable bar (22) connected in proper order, and the upper end of bottom bar subassembly (1) is detachably connected with the lower end of top bar main part (21), and target subassembly (3) is detachably connected with movable bar (22), and the total weight of the camera parameter field calibration tool for contact network geometry parameter detection system can be 5kg~15kg. It is convenient to carry, and it is convenient to use on site assembly.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of contact network geometry detection, specifically is a kind of camera parameter field calibration tool for contact network geometry parameter detection system. BACKGROUND

[0002] Currently, contact network geometry detection equipment has been installed and used on multiple high-speed comprehensive detection trains, comprehensive inspection vehicles, network inspection vehicles and high-speed rail contact network detection vehicles and other detection vehicles. The detection system uses a linear array camera to collect targets, and needs to be calibrated again after the camera or lens is repaired or replaced. The actual calibration range is large: 500mm horizontally, 1000mm-2500mm vertically. The currently used camera parameter field calibration tool is a one-piece fixed structure, which is large in volume (2.2 meters long) and mass (35 kg), and is not convenient for carrying and on-site use. + UTILITY MODEL CONTENTS

[0003] In order to solve the above-mentioned problem of large mass of existing field calibration tool, the utility model provides a camera parameter field calibration tool for contact network geometry parameter detection system, which contains multiple components, and the components are detachably connected. The total weight of the camera parameter field calibration tool for contact network geometry parameter detection system is 5kg-15kg, which is convenient for carrying and on-site assembly and use.

[0004] The technical solution adopted by the utility model embodiment to solve its technical problem is:

[0005] ​A camera parameter on-site calibration fixture for a catenary geometric parameter detection system includes a base rod assembly, a top rod assembly, and a target assembly. The top rod assembly comprises a top rod body and a movable rod connected in sequence. The movable rod can move up and down relative to the top rod body. The upper end of the base rod assembly is detachably connected to the lower end of the top rod body. The target assembly is detachably connected to the movable rod. The total weight of the camera parameter on-site calibration fixture for the catenary geometric parameter detection system is 5kg to 15kg. The total weight of the base rod assembly is less than 8kg. The base rod assembly comprises a base rod body, an adapter plate, and a buckle. The base rod body is an upright tubular structure, and the adapter plate is fixed to the lower end of the base rod body. In addition, the adapter plate can be detachably connected to the detection beam. The buckle is located on the upper part of the base rod body. The upper part of the base rod body is provided with a first positioning block. The lower part of the top rod body is provided with a hook. The lower part of the top rod body is matched and inserted into the first positioning block. The buckle and the hook are hooked together. The total weight of the top rod assembly is less than 8kg. The moving rod and the top rod body are arranged parallel to each other. The top rod body is an upright tubular structure. The front side of the top rod body is fixedly connected to a slide rail. The slide rail is parallel to the top rod body. The rear side of the moving rod is fixedly connected to a slider. The slider is matched and connected to the slide rail. The slider can move along the slide rail. The slider is connected to a locking screw. The locking screw can lock the slider and the slide rail.

[0006] Positioning strips are fixedly connected to both the left and right sides of the top rod body. The positioning strips are parallel to the top rod body. Multiple second positioning blocks are fixedly connected to the outer sides of the two positioning strips. The multiple second positioning blocks are evenly spaced along the extension direction of the top rod body. Height positioning modules are fixedly connected to both the left and right sides of the moving rod.

[0007] The height positioning module includes a mounting base, a stop block, a return spring, and a locking mechanism. The locking mechanism includes a locking pin and a reset button. The locking pin abuts against the stop block from front to back. When the locking pin is pushed from the front limit position to the rear limit position, the stop block is at the rear limit position, and the stop block abuts against the second positioning block from top to bottom. The second positioning block can prevent the moving rod and the height positioning module from moving downwards, and the reset button is in the pop-out state. When the reset button is pressed from the pop-out state to the pressed-in state, the locking pin can return from the rear limit position to the front limit position, and the return spring can push the stop block from the rear limit position forward to the front limit position. The stop block and the second positioning block are spaced apart from each other, and the second positioning block cannot prevent the moving rod and the height positioning module from moving up and down.

[0008] The top rod assembly also includes an upper target bracket and a lower target bracket arranged at intervals. Both the upper and lower target brackets are ring-shaped and are sleeved on the top rod body and the moving rod. Both the upper and lower target brackets are connected and fixed to the moving rod. The upper or lower target bracket on the moving rod is detachably connected to the target assembly from the front and back.

[0009] The on-site calibration fixture for camera parameters of the contact wire geometric parameter detection system also includes a connector. The connector is an upright elongated structure with a mounting groove inside. The mounting groove extends in the vertical direction and the opening of the mounting groove faces forward. The upper end of the bottom rod assembly is matched and fixed in the lower part of the mounting groove of the connector, and the lower end of the top rod body is matched and fixed in the upper part of the mounting groove of the connector.

[0010] The target assembly includes a target body, a target unit, and a first auxiliary light-shielding plate. The target body has a long strip structure and extends in the left and right direction. The cross-section of the target body has an inverted U-shaped structure. The target unit and the first auxiliary light-shielding plate are both located at the lower end of the target body. The first auxiliary light-shielding plate and the target unit are stacked on top of each other. Multiple target units are evenly spaced in the left and right direction.

[0011] The benchmark unit contains a marker strip and a blocking strip stacked on top of each other. Both the marker strip and the blocking strip extend in the front-to-back direction. One end of the marker strip and one end of the blocking strip are connected to the target body by a pin, which is in an upright position. The other end of the marker strip is connected to the target body by a first screw, and the other end of the blocking strip is connected to the target body by a second screw. The lower surface of the marker strip is white, and the lower surface of the blocking strip is black. The blocking strip can rotate around the pin and can block the marker strip.

[0012] The on-site calibration fixture for camera parameters in the contact wire geometric parameter detection system also includes a dual-support calibration module. This module comprises a dual-support connecting plate, an upper horizontal support assembly, a lower horizontal support assembly, a second auxiliary light-shielding plate, support rods, and a light-absorbing cloth. The dual-support connecting plate is an upright, elongated structure. The upper part of the connecting plate is detachably connected to the upper target support, and the lower part is detachably connected to the lower target support. Both the upper and lower horizontal support assemblies are elongated structures, and both extend along the left... Extending to the right, the upper and lower horizontal marker components are arranged parallel to each other at intervals. Both the upper and lower horizontal marker components are detachably connected to the double-support connecting plate. The second auxiliary light-shielding plate is fixed on the left and right sides of the upper horizontal marker component. The light-absorbing cloth is connected to the second auxiliary light-shielding plate and has an inverted U-shaped structure. Both the upper and lower horizontal marker components are provided with multiple insertion holes, which are evenly spaced along the left and right direction. There is at least one marker, which is inserted into the insertion hole and extends along the front and back direction.

[0013] The beneficial effects of this utility model embodiment are:

[0014] 1. Miniaturized and easy to carry: Compared with the original standard tooling, the weight is reduced to 5kg~15kg and the carrying length is reduced to 1.2 meters.

[0015] 2. Modular and tool-free assembly design facilitates on-site use: The tooling adopts a modular design, with quick positioning and fixing structures between modules, allowing for single-person on-site assembly and operation.

[0016] 3. Higher calibration accuracy: The target height adopts dual positioning, which is more accurate than the original single-sided positioning; the 11 rods on the target are fixed in position, which is more accurate than the original movable assembly structure.

[0017] 4. Effectively improves the ability to resist ambient light interference: The black light-absorbing cloth on the target serves as the background behind each target, and auxiliary light-blocking structures are added at both ends of the target outside the calibration range, which can effectively prevent ambient light interference. Attached Figure Description

[0018] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention.

[0019] Figure 1 This is a front view schematic diagram of the camera parameter field calibration fixture for the contact wire geometric parameter detection system described in this utility model.

[0020] Figure 2 This is a three-dimensional schematic diagram of the camera parameter on-site calibration fixture for the contact wire geometric parameter detection system described in this utility model.

[0021] Figure 3 This is a schematic diagram of the main body of the base rod.

[0022] Figure 4 This is a schematic diagram of the lower part of the base rod assembly.

[0023] Figure 5 This is a schematic diagram of the connection between the bottom rod assembly and the top rod assembly.

[0024] Figure 6 This is an internal diagram of the height positioning module.

[0025] Figure 7 This is an external schematic diagram of the height positioning module.

[0026] Figure 8 This is a partial cross-sectional view of the locking screw area.

[0027] Figure 9 This is a front view schematic diagram of the target component.

[0028] Figure 10 This is a top-down view of the target body.

[0029] Figure 11 This is a bottom-view diagram of the target assembly.

[0030] Figure 12 This is a left-side view of the target assembly.

[0031] Figure 13 yes Figure 11 Enlarged diagram of part A in the middle.

[0032] Figure 14 This is a front view schematic diagram of the dual-branch calibration module without light-absorbing cloth.

[0033] Figure 15 This is a top view of the dual-branch calibration module when it does not contain light-absorbing cloth.

[0034] Figure 16 This is a three-dimensional schematic diagram of the dual-branch calibration module.

[0035] Figure 17 This is a schematic diagram of the working state of the camera parameter field calibration fixture for the contact wire geometric parameter detection system described in this utility model when installing the target assembly.

[0036] Figure 18 This is a schematic diagram of the working state of the camera parameter field calibration fixture for the contact wire geometric parameter detection system described in this utility model when the dual-support calibration module is installed.

[0037] The annotations in the attached figures are explained as follows:

[0038] 1. Base rod assembly; 2. Top rod assembly; 3. Target assembly; 4. Connector; 5. Dual-support calibration module; 6. Testing beam;

[0039] 11. Base rod body; 12. Adapter plate; 13. Hook and loop fastener; 14. First positioning block;

[0040] 21. Top rod main body; 22. Moving rod; 23. Height positioning module; 24. Upper target bracket; 25. Lower target bracket;

[0041] 31. Target body; 32. Benchmark unit; 33. First auxiliary light shield;

[0042] 41. Install the groove;

[0043] 51. Double-braced connecting plate; 52. Upper horizontal marker assembly; 53. Lower horizontal marker assembly; 54. Second auxiliary light-shielding plate; 55. Marker; 56. Light-absorbing cloth; 57. Insertion hole; 58. Clip;

[0044] 61. Reference plane;

[0045] 211. Slide rail; 212. Positioning strip; 213. Second positioning block; 214. Hook;

[0046] 221. Slider; 222. Locking screw;

[0047] 231. Mounting base; 232. Stop; 233. Return spring; 234. Locking mechanism; 235. Locking pin; 236. Reset button;

[0048] 321. Identification strip; 322. Covering strip; 323. Pin; 324. First screw; 325. Second screw;

[0049] 3211, First connecting segment; 3212, Identification display segment; 3213, Second connecting segment. Detailed Implementation

[0050] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0051] For ease of understanding and description, the following description of this utility model uses absolute positional relationships. Unless otherwise specified, the directional word "above" indicates... Figure 1 The direction above, the directional word "down" indicates Figure 1 The lower side of the middle, the directional word "left" indicates Figure 1 The left side of the direction, the directional word "right" indicates Figure 1 The right-hand direction in the text, the directional word "front" indicates perpendicular to. Figure 1 The direction of the paper and the direction pointing inwards; the directional word "back" indicates perpendicular to. Figure 1 The direction of the orientation is towards the outside of the paper. This invention is described from the perspective of a reader or user, but the aforementioned directional terms should not be construed as limiting the scope of protection of this invention. Regarding the material, weight, size, angle, and parameters of the components, those skilled in the art can determine or replace them based on actual needs or a limited number of experiments.

[0052] like Figures 1 to 2 As shown in the embodiment of this utility model, a camera parameter field calibration fixture for a contact network geometric parameter detection system includes a base rod assembly 1, a top rod assembly 2, and a target assembly 3. The top rod assembly 2 contains a top rod body 21 and a movable rod 22 connected in sequence. The movable rod 22 can move up and down relative to the top rod body 21. The upper end of the base rod assembly 1 is detachably connected to the lower end of the top rod body 21. The target assembly 3 is detachably connected to the movable rod 22. The total weight (i.e., total mass) of the camera parameter field calibration fixture for the contact network geometric parameter detection system is 5kg to 15kg.

[0053] As an alternative implementation, the total weight of the base rod assembly 1 is less than 8 kg. The base rod assembly 1 includes a base rod body 11, an adapter plate 12, and a latch 13. The base rod body 11 is an upright tubular structure. The adapter plate 12 is fixed to the lower end of the base rod body 11 and can be detachably connected to the detection beam 6. The latch 13 is located on the upper end of the base rod body 11. A first positioning block 14 is provided on the upper end of the base rod body 11, and a hook 214 is provided on the lower end of the top rod body 21. The lower end of the top rod body 21 is matched and inserted into the first positioning block 14, and the latch 13 is hooked to the hook 214. The base rod assembly 1 and the top rod body 21 can be quickly and stably connected.

[0054] like Figures 1 to 4 As shown, the cross-section of the base rod body 11 can be rectangular. The adapter plate 12 can be connected to the base rod body 11 by bolts and positioning pins. The adapter plate 12 can also be connected to the detection beam 6 by bolts. The base rod body 11 and the adapter plate 12 are connected as one unit, eliminating assembly errors that occur during multiple assembly processes. Double bolts are used to tighten the two components, improving the positioning and fitting accuracy.

[0055] like Figures 4 to 5 As shown, multiple (e.g., three) latches 13 are located on the upper outer side of the base rod body 11. The multiple latches 13 are arranged at intervals along the circumference of the base rod body 11. Multiple (e.g., three) first positioning blocks 14 are provided on the upper end of the base rod body 11. The multiple first positioning blocks 14 are arranged at intervals along the circumference of the base rod body 11. Multiple (e.g., three) hooks 214 are provided on the lower outer side of the top rod body 21. The multiple hooks 214 are arranged at intervals along the circumference of the top rod body 21. The latches 13 and hooks 214 are hooked one-to-one.

[0056] As an alternative implementation, the total weight of the push rod assembly 2 is less than 8 kg. The moving rod 22 and the push rod body 21 are arranged parallel to each other. The push rod body 21 is an upright tubular structure. A slide rail 211 is fixedly connected to the front side of the push rod body 21. The slide rail 211 is parallel to the push rod body 21. A slider 221 is fixedly connected to the rear side of the moving rod 22. The slider 221 is matched and connected to the slide rail 211. The slider 221 can move up and down along the slide rail 211. The slider 221 is connected to a locking screw 222. The locking screw 222 can lock the slider 221 and the slide rail 211.

[0057] like Figures 5 to 8As shown, the cross-section of the top rod body 21 can be rectangular. The size and shape of the cross-section of the top rod body 21 and the bottom rod body 11 can be the same. The slide rail 211 is a double-axis slide rail, which contains a groove. The slider 221 is matched and connected to the groove of the slide rail 211. The cross-section of the groove can be approximately dovetail-shaped. The slider 221 can only move up and down relative to the slide rail 211 and cannot disengage from the slide rail 211. The locking screw 222 is threadedly connected to the slider 221. One end of the locking screw 222 is provided with a threaded section, and the other end of the locking screw 222 is provided with a selection handle.

[0058] As one possible implementation, positioning strips 212 are fixedly connected to the left and right sides of the top rod body 21. The positioning strips 212 are parallel to the top rod body 21, and the inner surfaces of the two positioning strips 212 are fitted and fixedly connected to the top rod body 21. Multiple second positioning blocks 213 are fixedly connected to the outer surfaces of the two positioning strips 212. The multiple second positioning blocks 213 are evenly spaced along the extension direction of the top rod body 21. Height positioning modules 23 are fixedly connected to the left and right sides of the moving rod 22. The sliding height employs dual positioning, with second positioning blocks 213 on both sides of the positioning strips 212, ensuring reliable positioning and preventing target skew.

[0059] The height positioning module 23 includes a mounting base 231, a stop block 232, a return spring 233, and a locking mechanism 234. The locking mechanism 234 includes a locking pin 235 and a reset button 236. The mounting base 231 is fixed to the moving rod 22 by bolts. The mounting base 231 is used to install the stop block 232, the return spring 233, and the locking mechanism 234. The locking pin 235 and the stop block 232 are always in contact with each other. The stop block 232 is roughly L-shaped. The locking pin 235 and the stop block 232 can move back and forth synchronously. The return spring 233 can reset the stop block 232, and the reset button 236 can reset the locking pin 235.

[0060] like Figures 5 to 7As shown, when the locking pin 235 is pushed backward from the front limit position to the rear limit position, the stop block 232 is located at the rear limit position. The stop block 232 and the second positioning block 213 can abut vertically. The second positioning block 213 can prevent the moving rod 22 and the height positioning module 23 from moving downward, and the reset button 236 is in the pop-out state. When the reset button 236 is pressed from the pop-out state to the pressed-in state, the locking pin 235 can return from the rear limit position to the front limit position. The reset spring 233 can push the stop block 232 forward from the rear limit position to the front limit position. The stop block 232 and the second positioning block 213 are set at a distance (or staggered). The second positioning block 213 cannot prevent the moving rod 22 and the height positioning module 23 from moving up and down. At this time, the moving rod 22 can move freely up and down relative to the top rod body 21. The advantage of the stop block 232 and the second positioning block 213 abutting and positioning is that no alignment is required, the operation is simple and efficient, and the positioning structure error is less than 0.03mm.

[0061] The locking mechanism 234 can be a product of existing technology. For example, the locking mechanism 234 can be a spring lock produced by Shanghai Jiutao Trading Co., Ltd., with the spring lock model being CX42 and the spring lock brand being Deford.

[0062] like Figure 2 As shown, the top rod assembly 2 also includes an upper target bracket 24 and a lower target bracket 25 arranged at intervals. Both the upper target bracket 24 and the lower target bracket 25 are ring-shaped structures. The vertical distance between the upper target bracket 24 and the lower target bracket 25 can be 700mm. The upper target bracket 24 and the lower target bracket 25 are basically the same in size and structure. Both the upper target bracket 24 and the lower target bracket 25 are sleeved on the top rod body 21 and the moving rod 22. Both the upper target bracket 24 and the lower target bracket 25 are connected and fixed to the moving rod 22. The upper target bracket 24 and the lower target bracket 25 can move up and down synchronously with the moving rod 22. The upper target bracket 24 or the lower target bracket 25 on the moving rod 22 can be detachably connected to the target assembly 3.

[0063] To facilitate accurate height adjustment, multiple sets of height dimension markings are provided on the left and right sides of the top rod body 21. Each height dimension marking corresponds to a second positioning block 213. Each set of height dimension markings contains two height markings, one above the other. When the stop block 232 of the height positioning module 23 abuts against the second positioning block 213, the height of the upper target bracket 24 corresponds to the upper height marking of the two height markings, and the height of the lower target bracket 25 corresponds to the lower height marking of the two height markings.

[0064] This can be understood as follows: when the target assembly 3 is connected to the lower target bracket 25, the height of the target assembly 3 corresponds to the height marking below; when the target assembly 3 is connected to the upper target bracket 24, the height of the target assembly 3 corresponds to the height marking above. The height of the target assembly 3 is the vertical distance between the reference plane 61 of the detection beam 6 and the lower surface of the target rod unit 32 of the target assembly 3. Figure 12 , Figure 13 and Figure 17 As shown.

[0065] like Figures 1 to 2 As shown, as an optional implementation, the camera parameter field calibration fixture for the contact wire geometric parameter detection system further includes a connector 4. The connector 4 is an upright elongated structure. A mounting groove 41 is provided inside the connector 4. The mounting groove 41 extends in the vertical direction and the opening of the mounting groove 41 faces forward. The upper end of the bottom rod assembly 1 is matched and fixed in the lower part of the mounting groove 41 of the connector 4, and the lower end of the top rod body 21 is matched and fixed in the upper part of the mounting groove 41 of the connector 4.

[0066] The function of connector 4 is to make the connection and fixation between the base rod assembly 1 and the top rod body 21 more secure. Connector 4 can be a section of channel steel. Connector 4 can be connected to the base rod assembly 1 by a star-shaped handle bolt, and connector 4 can also be connected to the top rod body 21 by a star-shaped handle bolt. Using star-shaped handle bolts facilitates operation.

[0067] like Figures 9 to 12 As shown, in one possible implementation, the target assembly 3 includes a target body 31, a target unit 32, and a first auxiliary light-shielding plate 33. The target body 31 has a long strip structure and extends in the left-right direction. The cross-section of the target body 31 has an inverted U-shaped structure. The target unit 32 and the first auxiliary light-shielding plate 33 are both located at the lower end of the target body 31. The first auxiliary light-shielding plate 33 is parallel to the horizontal plane. The first auxiliary light-shielding plate 33 can be a black metal or plastic plate. The first auxiliary light-shielding plate 33 can move left and right. The first auxiliary light-shielding plate 33 and the target unit 32 are stacked vertically. Multiple target units 32 are evenly spaced in the left-right direction.

[0068] like Figures 11 to 13As shown, the target unit 32 includes a marker strip 321 and a blocking strip 322 stacked on top of each other. Both the marker strip 321 and the blocking strip 322 extend in the front-back direction. One end of the marker strip 321 and one end of the blocking strip 322 are connected to the target body 31 by a pin 323, which is in an upright state. The other end of the marker strip 321 is connected to the target body 31 by a first screw 324, and the other end of the blocking strip 322 is connected to the target body 31 by a second screw 325. The lower surface of the marker strip 321 is white, and the lower surface of the blocking strip 322 is black. The blocking strip 322 can rotate 90° around the pin 323 and can block or not block the marker strip 321.

[0069] like Figure 13 As shown, the marking strip 321 has an I-shaped structure. Along the front-to-back direction, the marking strip 321 contains a first connecting segment 3211, a marking display segment 3212, and a second connecting segment 3213 connected in sequence. The first connecting segment 3211 of the marking strip 321 is connected and fixed to the target body 31 by a pin 323. The second connecting segment 3213 of the marking strip 321 is connected and fixed to the target body 31 by a first screw 324. The blocking strip 322 can block or not block the marking display segment 3212 of the marking strip 321.

[0070] There are 11 marker units 32. The length of the first auxiliary light-shielding plate 33 in the left-right direction is greater than the total length of all marker units 32 in the left-right direction. The marker units 32 are the targets for camera imaging. The lower surface of the blocking strip 322 can be covered with black light-absorbing cloth. When calibrating, the blocking strip 322 is rotated so that it does not block the marking display segment 3212 of the marking strip 321. When performing single-piece verification, a portion of the blocking strip 322 is rotated 90° so that the required blocking strip 322 blocks the marking display segment 3212 of the corresponding marking strip 321, exposing only the marking display segment 3212 of the required marking strip 321.

[0071] like Figures 14 to 16 As shown, as an optional implementation, the camera parameter field calibration fixture for the contact wire geometric parameter detection system further includes a dual-support calibration module 5. The dual-support calibration module 5 includes a dual-support connecting plate 51, an upper horizontal marker assembly 52, a lower horizontal marker assembly 53, a second auxiliary light-shielding plate 54, a marker 55, and a black light-absorbing cloth 56. The dual-support connecting plate 51 is an upright elongated structure. The upper part of the dual-support connecting plate 51 is detachably connected to the upper target bracket 24, and the lower part of the dual-support connecting plate 51 is detachably connected to the lower target bracket 25.

[0072] Both the upper horizontal marker assembly 52 and the lower horizontal marker assembly 53 are elongated structures, extending horizontally. They are arranged parallel to each other vertically and are detachably connected to the double-support connecting plate 51. The second auxiliary light-shielding plate 54 is fixed to the left and right sides of the upper horizontal marker assembly 52, and is parallel to the horizontal plane. The light-absorbing cloth 56 is connected to the second auxiliary light-shielding plate 54. The light-shielding plate 54 is connected by a clip 58. The light-absorbing cloth 56 is used to prevent interference from external ambient light during inspection. The light-absorbing cloth 56 has an inverted U-shaped structure. The upper horizontal marker assembly 52 and the lower horizontal marker assembly 53 are provided with multiple (11) insertion holes 57. The multiple insertion holes 57 are evenly spaced along the left and right direction. The distance between two adjacent insertion holes 57 is 100mm. There is at least one marker 55. The marker 55 is inserted into the insertion hole 57 from the front to the back. The marker 55 extends along the front and back direction.

[0073] The on-site calibration fixture for camera parameters of the overhead contact line geometric parameter detection system may include a base rod assembly 1, a top rod assembly 2, a target assembly 3, a connector 4, and a dual-support calibration module 5. For example, the total weight of the on-site calibration fixture for camera parameters of the overhead contact line geometric parameter detection system can be 10kg to 13kg (e.g., around 12kg). The overall volume of the on-site calibration fixture for camera parameters of the overhead contact line geometric parameter detection system after disassembly is small and can be packed into a small flight case with external dimensions of 1.25m × 0.22m × 0.3m.

[0074] The largest assembled module among the base rod assembly 1, top rod assembly 2, target assembly 3, connector 4, and dual-support calibration module 5 weighs no more than 8 kg and is approximately 1.1 meters long. It employs a tool-free assembly method, allowing for single-person on-site handling and assembly. The on-site calibration fixture for camera parameters in the catenary geometric parameter detection system is compatible with calibration, single-support verification, and dual-support calibration functions. Connections not detailed in the on-site calibration fixture for camera parameters in the catenary geometric parameter detection system can be bolted. Alternatively, the on-site calibration fixture for camera parameters in the catenary geometric parameter detection system can be made of other materials with lower density and higher strength to further reduce the weight of the calibration fixture.

[0075] The following describes the usage of the camera parameter field calibration fixture for the overhead contact line geometric parameter detection system.

[0076] Assemble the camera parameter field calibration fixture for the contact wire geometric parameter detection system. The upper end of the base rod body 11 is connected to the lower end of the top rod body 21. The upper end of the base rod body 11 is fixed in the lower part of the mounting groove 41 of the connector 4, and the lower end of the top rod body 21 is fixed in the upper part of the mounting groove 41 of the connector 4. The adapter plate 12 is connected and fixed to the detection beam 6.

[0077] The moving rod 22 and the height positioning module 23 move upwards or downwards. When the height positioning module 23 is above the required calibration height mark, the locking pin 235 is pushed from the front limit position to the rear limit position. The stop block 232 is located at the rear limit position (i.e., the working position), and the moving rod 22 and the height positioning module 23 are lowered. The stop block 232 and the second positioning block 213 can abut against each other vertically, completing the precise height positioning. Tighten the locking screw 222 of the slider, and the moving rod 22 is locked to the top rod body 21. When the calibration height needs to be changed, loosen the locking screw 222 of the slider, press the reset button 236, and the locking pin 235 can return from the rear limit position to the front limit position. The reset spring 233 can push the stop block 232 from the rear limit position to the front limit position. The stop block 232 and the second positioning block 213 are set at intervals (or staggered). The stop block 232 is reset under the action of the reset spring 233 and leaves the working position to the waiting position. At this time, the moving rod 22 can move freely up and down relative to the top rod body 21.

[0078] like Figure 17 As shown, during calibration testing, the target assembly 3 is connected to the upper target bracket 24 or the lower target bracket 25. The shielding strip 322 is rotated so that it does not obstruct the marking display segment 3212 of any of the marking strips 321, meaning that the marking display segments 3212 of all marking strips 321 are exposed. The camera and lights on the detection beam 6 are both facing the target assembly 3. The specific calibration testing method is the same as that of the prior art.

[0079] like Figure 17 As shown, during single-piece verification, the target assembly 3 is connected to the upper target bracket 24 or the lower target bracket 25. A portion of the blocking strip 322 is rotated 90° so that the required blocking strip 322 blocks the marking display segment 3212 of the corresponding marking strip 321, exposing only the marking display segment 3212 of the required marking strip 321. The camera and light on the detection beam 6 are both facing the target assembly 3. The specific method of single-piece verification is the same as that of the prior art.

[0080] like Figure 18As shown, during dual-support calibration, the target assembly 3 is removed, the dual-support calibration module 5 is installed, the upper part of the dual-support connecting plate 51 is connected to the upper target bracket 24, and the lower part of the dual-support connecting plate 51 is connected to the lower target bracket 25. The camera and light on the detection beam 6 are both facing the dual-support calibration module 5. The specific method of dual-support calibration is the same as that of the prior art.

[0081] The above description is merely a specific embodiment of this utility model and should not be construed as limiting the scope of its implementation. Therefore, any substitution of equivalent components or equivalent changes and modifications made within the scope of protection of this utility model should still fall within its coverage. Furthermore, the technical features, technical solutions, and embodiments of this utility model can be freely combined and used.

Claims

1. A fixture for on-site calibration of camera parameters in a contact wire geometric parameter detection system, characterized in that, The camera parameter field calibration fixture for the contact network geometric parameter detection system includes a base rod assembly (1), a top rod assembly (2), and a target assembly (3). The top rod assembly (2) contains a top rod body (21) and a moving rod (22) connected in sequence. The moving rod (22) can move up and down relative to the top rod body (21). The upper end of the base rod assembly (1) is detachably connected to the lower end of the top rod body (21). The target assembly (3) is detachably connected to the moving rod (22). The total weight of the camera parameter field calibration fixture for the contact network geometric parameter detection system is 5kg to 15kg. The total weight of the bottom rod assembly (1) is less than 8kg. The bottom rod assembly (1) includes a bottom rod body (11), a transition plate (12) and a buckle (13). The bottom rod body (11) is an upright tubular structure. The transition plate (12) is fixed to the lower end of the bottom rod body (11). The transition plate (12) can be detachably connected to the detection beam (6). The buckle (13) is located on the upper end of the bottom rod body (11). A first positioning block (14) is provided on the upper end of the bottom rod body (11). A hook (214) is provided on the lower end of the top rod body (21). The lower end of the top rod body (21) is matched and inserted with the first positioning block (14). The buckle (13) is hooked to the hook (214). The total weight of the push rod assembly (2) is less than 8kg. The moving rod (22) and the push rod body (21) are arranged in parallel front and back. The push rod body (21) is an upright tubular structure. The front side of the push rod body (21) is fixedly connected to the slide rail (211). The slide rail (211) is parallel to the push rod body (21). The rear side of the moving rod (22) is fixedly connected to the slider (221). The slider (221) is matched and connected to the slide rail (211). The slider (221) can move along the slide rail (211). The slider (221) is connected to the locking screw (222). The locking screw (222) can lock the slider (221) and the slide rail (211).

2. The on-site calibration fixture for camera parameters in a contact wire geometric parameter detection system according to claim 1, characterized in that, Positioning strips (212) are fixedly connected to both the left and right sides of the top rod body (21). The positioning strips (212) are parallel to the top rod body (21). Multiple second positioning blocks (213) are fixedly connected to the outer sides of the two positioning strips (212). The multiple second positioning blocks (213) are evenly spaced along the extension direction of the top rod body (21). Height positioning modules (23) are fixedly connected to both the left and right sides of the moving rod (22).

3. The on-site calibration fixture for camera parameters in a contact wire geometric parameter detection system according to claim 2, characterized in that, The height positioning module (23) includes a mounting base (231), a stop (232), a return spring (233), and a locking mechanism (234). The locking mechanism (234) includes a locking pin (235) and a reset button (236). The locking pin (235) abuts against the stop (232) from front to back. When the locking pin (235) is pushed from the front limit position to the rear limit position, the stop (232) is located at the rear limit position. The stop (232) can abut against the second positioning block (213) from top to bottom. The second positioning block (213) can block the moving rod. (22) and the height positioning module (23) move downwards, and the reset button (236) is in the pop-up state; when the reset button (236) is pressed from the pop-up state to the pressed-in state, the locking pin (235) can return from the rear limit position to the front limit position, and the reset spring (233) can push the stop block (232) from the rear limit position to the front limit position. The stop block (232) and the second positioning block (213) are spaced apart, and the second positioning block (213) cannot block the moving rod (22) and the height positioning module (23) from moving up and down.

4. The on-site calibration fixture for camera parameters in a contact wire geometric parameter detection system according to claim 1, characterized in that, The top rod assembly (2) also includes an upper target bracket (24) and a lower target bracket (25) spaced apart vertically. Both the upper target bracket (24) and the lower target bracket (25) are ring-shaped. Both the upper target bracket (24) and the lower target bracket (25) are sleeved outside the top rod body (21) and the moving rod (22). Both the upper target bracket (24) and the lower target bracket (25) are connected and fixed to the moving rod (22). The upper target bracket (24) or the lower target bracket (25) on the moving rod (22) is detachably connected to the target assembly (3) from front to back.

5. The on-site calibration fixture for camera parameters in a contact wire geometric parameter detection system according to claim 1, characterized in that, The on-site calibration fixture for camera parameters of the contact wire geometric parameter detection system also includes a connector (4). The connector (4) is an upright elongated structure. An installation groove (41) is provided inside the connector (4). The installation groove (41) extends in the vertical direction. The opening of the installation groove (41) faces forward. The upper end of the bottom rod assembly (1) is matched and fixed in the lower part of the installation groove (41) of the connector (4). The lower end of the top rod body (21) is matched and fixed in the upper part of the installation groove (41) of the connector (4).

6. The on-site calibration fixture for camera parameters in a contact wire geometric parameter detection system according to claim 1, characterized in that, The target assembly (3) includes a target body (31), a target unit (32), and a first auxiliary light shield (33). The target body (31) has a long strip structure and extends in the left and right direction. The cross-section of the target body (31) has an inverted U-shaped structure. The target unit (32) and the first auxiliary light shield (33) are both located at the lower end of the target body (31). The first auxiliary light shield (33) and the target unit (32) are stacked on top of each other. Multiple target units (32) are evenly spaced in the left and right direction.

7. The on-site calibration fixture for camera parameters in a contact wire geometric parameter detection system according to claim 6, characterized in that, The benchmark unit (32) contains a marker strip (321) and a shielding strip (322) stacked on top of each other. Both the marker strip (321) and the shielding strip (322) extend in the front-back direction. One end of the marker strip (321) and one end of the shielding strip (322) are connected to the target body (31) by a pin (323). The pin (323) is in an upright state. The other end of the marker strip (321) is connected to the target body (31) by a first screw (324). The other end of the shielding strip (322) is connected to the target body (31) by a second screw (325). The lower surface of the marker strip (321) is white and the lower surface of the shielding strip (322) is black. The shielding strip (322) can rotate around the pin (323) and can shield the marker strip (321).

8. The on-site calibration fixture for camera parameters in a contact wire geometric parameter detection system according to claim 4, characterized in that, The on-site calibration fixture for camera parameters of the contact wire geometric parameter detection system also includes a dual-support calibration module (5). The dual-support calibration module (5) contains a dual-support connecting plate (51), an upper horizontal marker assembly (52), a lower horizontal marker assembly (53), a second auxiliary light-shielding plate (54), a marker (55), and a light-absorbing cloth (56). The dual-support connecting plate (51) is an upright elongated structure. The upper part of the dual-support connecting plate (51) is detachably connected to the upper target bracket (24), and the lower part of the dual-support connecting plate (51) is detachably connected to the lower target bracket (25). The upper horizontal marker assembly (52) and the lower horizontal marker assembly (53) are both elongated structures. The upper horizontal marker assembly (52) and the lower horizontal marker assembly (53) are both along the left and right directions. Extended, the upper horizontal marker assembly (52) and the lower horizontal marker assembly (53) are arranged parallel to each other. Both the upper horizontal marker assembly (52) and the lower horizontal marker assembly (53) are detachably connected to the double-branch connecting plate (51). The second auxiliary light-shielding plate (54) is fixed on the left and right sides of the upper horizontal marker assembly (52). The light-absorbing cloth (56) is connected to the second auxiliary light-shielding plate (54). The light-absorbing cloth (56) has an inverted U-shaped structure. Both the upper horizontal marker assembly (52) and the lower horizontal marker assembly (53) are provided with multiple insertion holes (57). The multiple insertion holes (57) are evenly spaced along the left and right direction. The number of markers (55) is at least one. The markers (55) are inserted into the insertion holes (57). The markers (55) extend along the front and back direction.

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