A precise positioning method based on a catheter model

Abstract

The present application belongs to the technical field of catheter positioning, and relates to a precise positioning method based on a catheter model. The core technology of the present application is to determine the position of a positioning clamp through plane projection of a three-dimensional model of the catheter and basic data measurement, and to complete the manufacturing of the positioning clamp after adjusting the positioning clamp device to the target position according to the data calculated after measurement. The method can accurately and effectively control the shape of the catheter part, and the positioning devices can be repeatedly assembled and utilized.

Description

Technical Field

[0001] This invention belongs to the field of catheter positioning technology and relates to a precise positioning method based on a catheter model. Background Technology

[0002] In the aviation industry, aircraft have numerous ducts of various shapes and sizes. Most duct components need to be fixed to the airframe structure, such as using clamps for positioning. For duct components with high manufacturing precision requirements, traditional positioning fixtures are generally used to inspect the clamp installation area before delivery, and the fixtures are used to check whether the shape meets the assembly requirements.

[0003] Traditional positioning fixture design typically relies on engineers' experience and repeated trials, a method that is not only time-consuming and labor-intensive but also difficult to guarantee accuracy. For aerospace duct components, to ensure part precision and machining efficiency, a precise positioning technology based on a duct model is required. Summary of the Invention

[0004] To address the problems existing in the prior art, this invention provides a positioning method based on a catheter model. The main core technology involves determining the position of the positioning fixture by projecting the three-dimensional model of the catheter onto a plane and measuring basic data. After adjusting the positioning fixture device to the target position based on the measured and calculated data, the manufacturing of the positioning fixture is completed.

[0005] The technical solution adopted in this invention is as follows:

[0006] A precise localization method based on a catheter model, comprising the following steps:

[0007] Step 1: Develop a device for a special catheter positioning clamp.

[0008] For conduit-type parts, the main method of positioning the conduit shape is by means of a bracket. The device can freely adjust the height and angle of the bracket. A special conduit positioning fixture device includes: a main load-bearing component, a magnetic base component for positioning device, and a digital display component.

[0009] The main load-bearing components include a main support column and an adjusting support column, which are connected by a bushing. The main support column has a built-in height motor, and a switch controls both the height motor and the angle motor. The height motor drives a chain to adjust the height of the adjusting support column, and the chain is fixed to the adjusting support column. The angle motor drives a gear shaft, which is fixed to a bracket; rotation of the gear shaft rotates the bracket.

[0010] The positioning device's magnetic base component comprises a base, a switch slide rail, a magnet, brass, and a magnetic switch. The magnet is embedded inside the base, the switch slide rail and magnetic switch are placed on the outer surface of the base, and the brass is placed in the center of the base.

[0011] The digital display component consists of a grating ruler, an angle display, and a pointer sensor. The bottom of the grating ruler is flush with the bottom of the device and primarily detects the height position of the pointer sensor. The pointer sensor is flush with the top of the adjusting support column to monitor the height position. The angle display detects the rotation angle of the gear shaft in real time.

[0012] Step 2: Determine the position of the catheter positioning device base.

[0013] The 3D model of the conduit component is projected onto a plane using engineering software. The developed positioning fixture bracket is placed on the straight segment of the conduit's planar projection until the axis of the positioning fixture base coincides with the center line of the pipe's projection. The number of positioning fixture brackets is calculated using the following formula. When the straight segment of the component is less than 20mm, positioning brackets are not required.

[0014] n (托架数量) =n (直线段数量) =n (弯曲数量) -1

[0015] Step 3: Determine the angle and position of the catheter support and adjust the height of the support column.

[0016] Place each positioning device of the conduit at the pipe projection position. The axis of the positioning clamp device base coincides with the center line of the pipe projection. To obtain the offset angle α of the bracket and the height L1 of the adjusting support, the offset angle α is the angle between the pipe projection line and the horizontal line. The calculation method of L1 is as follows:

[0017]

[0018] in,

[0019] α is the offset angle;

[0020] L2 is the length of the bracket;

[0021] L1 is for adjusting the height of the support rod;

[0022] h is the height of the conduit from the magnetic base.

[0023] Step 4: Mark parameter information.

[0024] Create a border within the projection area in the engineering software. Using the lower left corner of the border as the reference origin, measure the XY coordinates of the four corners at the bottom of each device. Mark the XY coordinates of each base on the plane, the height of the support column, and the angle of the bracket on the metal platform.

[0025] Step 5: Adjust the positioning fixture.

[0026] First, fix the positioning clamp at point 1 according to step 3. Then, press the switch. The height motor will automatically adjust the height of the support column according to the height of the pipe's projection in the model. The height value during adjustment can be displayed in real time via a grating ruler. The angle motor drives the gear shaft, which in turn drives the bracket to complete the angular positioning of the bracket.

[0027] The formula for calculating the change in the height of the adjustable support is as follows:

[0028] ΔL1=2πnr1t1

[0029] in,

[0030] n is the motor speed

[0031] r1 is the radius of the height motor gear.

[0032] t1 is the rotation time of the height motor.

[0033] The formula for calculating the angle change of the bracket is as follows:

[0034]

[0035] in,

[0036] n is the motor speed

[0037] r2 is the radius of the angle motor gear.

[0038] t2 is the rotation time of the angle motor.

[0039] r3 is the radius of the gear shaft.

[0040] The beneficial effects of this invention are:

[0041] This method provides a way to quickly and accurately manufacture flexible positioning devices based on models, which can accurately and effectively control the shape of conduit parts, and the positioning devices can be repeatedly assembled and reused. Attached Figure Description

[0042] Figure 1 This is the front view of the positioning fixture device;

[0043] Figure 2 This is a left view of the positioning clamping device;

[0044] Figure 3 Schematic diagram of the device base placement;

[0045] Figure 4 Schematic diagram of key parameters;

[0046] Figure 5 A photograph of the actual part;

[0047] Figure 6This is a front view of the part and a schematic diagram of its height measurement;

[0048] Figure 7 This is a top view of the part and a schematic diagram of the base placement.

[0049] In the diagram: 1. Base, 2. Switch slide rail, 3. Magnet, 4. Brass, 5. Switch, 6. Height motor, 7. Main support, 8. Chain, 9. Adjustment support, 10. Pointer sensor, 11. Height position display, 12. Grating ruler, 13. Angle display, 14. Angle motor, 15. Gear shaft, 16. Bracket, 17. Magnetic switch. Detailed Implementation

[0050] With bent conduit parts ( Figure 5 Using ) as an example, we will provide a detailed explanation of the actual operation.

[0051] 1. Place the conduit component and the platform base model on the same interface, and use the projection function in the 3D software to create an overall top view and front view (e.g., ...). Figure 6 and Figure 7 ).

[0052] 2. Based on the shape characteristics of the conduit component, the position of the base of the positioning fixture can be drawn on the top view of the overall system. The system identifies the centerline of the straight area of ​​the conduit in the top view, then matches the shape of the base with the centerline, and projects the centerline point of the base onto the platform of the front view. The height distance between the two bases and the selected point of the component is obtained through planar measurement, which is the h value in step 3. From this, the angle α of the bracket and the height L1 of the adjusting support can be obtained.

[0053] 3. Export the device base position information, including XY coordinates, support column height, and bracket angle information, from the engineering software. Mark the base position on the metal platform based on the base's XY coordinate information, and simultaneously mark the support column height and bracket angle positions in the vicinity.

[0054] 4. Place the printing paper on the metal operating platform, place the positioning device base inside the printing base frame, and turn the magnetic switch to make the positioning device firmly adhere to the metal operating platform.

[0055] 5. Press and hold the switch button to raise the height of the adjustable support column. Simultaneously, the height position display on the grating ruler will show the top height of the adjustable support column in real time. The raising will stop when the displayed value equals the height parameter information on the base plate. Adjust the angle by rotating the motor until the angle value on the angle display equals the angle parameter information on the base plate. Once the height and angle values ​​are adjusted, the current positioning device is ready for adjustment, and the next device can be adjusted.

[0056] 6. Once all positioning devices have been adjusted, the entire positioning system is complete. Based on the current positioning system environment, the shape of the conduit parts is inspected, and the welding parts are repaired and fitted.

Claims

1. A precise localization method based on a catheter model, characterized in that, The steps are as follows: Step 1: Develop a special catheter positioning device, including: a main load-bearing component, a magnetic base component for the positioning device, and a digital display component; The main load-bearing components include a main support column (7) and an adjusting support column (9), which are connected by a bushing. The main support column (7) has a built-in height motor (6), and the height motor and angle motor (14) are controlled by a switch (5). The height motor (6) drives the chain (8) to adjust the height position of the adjusting support column (9). The chain (8) and the adjusting support column (9) are fixed together. The angle motor (14) drives the gear shaft (15), which is fixed together with the bracket (16). The rotation of the gear shaft (15) can drive the bracket (16) to rotate. The magnetic base component of the positioning device includes a base (1); Step 2: Determine the position of the catheter positioning device base; The three-dimensional model of the conduit parts is projected onto a plane using engineering software. The developed positioning device bracket is placed on the straight segment of the conduit plane projection until the axis of the positioning device base coincides with the center line of the conduit projection. The calculation method for the number of positioning device brackets is shown in the following formula (1): n (托架数量) =n (直线段数量) =n (弯曲数量) -1 (1) Step 3: Determine the angle of the catheter support and adjust the height of the support column; Place each positioning device of the catheter at the catheter projection position. The axis of the positioning device base coincides with the center line of the catheter projection. The offset angle α of the bracket and the height L1 of the adjusting support need to be obtained. The offset angle α is the angle between the catheter projection line and the horizontal line. The calculation method of L1 is as shown in formula (2): in, α is the offset angle; L2 is the length of the bracket; L1 is used to adjust the height of the support column; h is the height of the conduit from the base; Step 4: Mark parameter information; Create a border in the projection area of ​​the engineering software, and take the lower left corner of the border as the reference origin to measure the XY coordinate values ​​of the four corners of the bottom of each device; mark the XY coordinate position of each base on the plane on the metal platform, and adjust the support height position information and bracket angle position information. Step 5: Adjust the catheter positioning device; According to step 3, first fix the positioning device at point 1, then press the switch. The height motor will automatically adjust the height of the support column according to the height of the guide tube projected in the model. The height value during height adjustment can be displayed at any time through the grating ruler. The angle motor drives the gear shaft, and the gear shaft drives the bracket to complete the angle positioning of the bracket. The formula (3) for calculating the change in the height of the adjusting support is as follows: ΔL1=2πn1r1t1 (3) in, n1 is the speed of the height motor; r1 is the radius of the height motor gear; t1 is the rotation time of the height motor; The formula (4) for calculating the change in the bracket angle is as follows: in, n2 is the rotational speed of the angle motor; r2 is the radius of the angle motor gear; t2 is the rotation time of the angle motor; r3 is the radius of the gear shaft.

2. The precise positioning method based on a catheter model as described in claim 1, characterized in that, The positioning device magnetic base component includes a switch slide rail (2), a magnet (3), brass (4) and a magnetic switch (17); the magnet (3) is built into the base (1), the switch slide rail (2) and the magnetic switch (17) are placed on the outer surface of the base (1), and the brass (4) is placed in the middle of the base (1).

3. A precise positioning method based on a catheter model as described in claim 1 or 2, characterized in that, The digital display component consists of a grating ruler (12), an angle display (13), and a pointer sensor (10). The bottom of the grating ruler (12) is flush with the bottom of the device to detect the height position of the pointer sensor (10). The pointer sensor (10) is flush with the top of the adjusting support (9) to monitor the height position. The angle display (13) detects the rotation angle of the gear shaft in real time.

4. A precise positioning method based on a catheter model as described in claim 1 or 2, characterized in that, In step 2, if the straight segment of the part is less than 20mm, no positioning bracket is placed.

5. The precise positioning method based on a catheter model as described in claim 3, characterized in that, In step 2, if the straight segment of the part is less than 20mm, no positioning bracket is placed.

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