Accurate positioning method based on catheter model

Abstract

The invention belongs to the technical field of catheter positioning, and relates to an accurate positioning method based on a catheter model. According to the core technology, the position of the positioning clamp is determined through plane projection and basic data measurement of the three-dimensional catheter model, and after the positioning clamp device is adjusted to the target position according to the measured and calculated data, manufacturing of the positioning clamp can be completed. According to the method, the appearance of the conduit part can be accurately and effectively controlled, and meanwhile, the positioning device can be repeatedly assembled and utilized.

Description

Technical Field

[0001] The invention belongs to the technical field of catheter positioning, and relates to an accurate positioning method based on a catheter model. Background Art

[0002] In the aviation field, there are many ducts on aircraft with different shapes, and most of the duct parts need to be fixed on the body structure, such as using clamps to limit the position. For duct parts with high manufacturing precision requirements, traditional positioning fixtures are generally used to inspect the clamp installation area before the duct parts are delivered, and the fixture is used to detect whether its appearance meets the assembly requirements.

[0003] Traditional positioning fixture design usually relies on engineers' experience and repeated trials, which is not only time-consuming and labor-intensive, but also difficult to ensure accuracy. In order to ensure the accuracy and processing efficiency of aviation duct parts, a precise positioning technology based on the duct model is required. Summary of the invention

[0004] In view of the problems existing in the prior art, the present invention provides a positioning method based on a catheter model. The main core technology is to determine the position of the positioning fixture by plane projection of the catheter three-dimensional model and basic data measurement, and adjust the positioning fixture device to the target position according to the measured and calculated data to complete the manufacturing of the positioning fixture.

[0005] The technical solution adopted by the present invention is:

[0006] A precise positioning method based on a catheter model, the steps are as follows:

[0007] Step 1: Develop a dedicated catheter positioning fixture device.

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

[0009] The main load-bearing member includes a main support and an adjustment support, which are connected by a shaft sleeve. The main support has a built-in height motor, which is controlled by a switch. The height motor drives a chain to adjust the height position of the adjustment support, and the chain is fixed to the adjustment support. The angle motor drives the gear shaft, which is fixed to the bracket, and the rotation of the gear shaft can drive the bracket to rotate.

[0010] The magnetic base component of the positioning device comprises a base, a switch slide rail, a magnet, brass and a magnetic switch. The magnet is built into the base, the switch slide rail and the magnetic switch are placed on the outer surface of the base, and the brass is placed in the middle of the base.

[0011] The digital display component is composed 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 mainly detects the height position of the pointer sensor. The pointer sensor is flush with the top of the adjustment support to monitor the height position. The angle display detects the rotation angle of the gear shaft in real time.

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

[0013] The three-dimensional model of the catheter part is projected on the plane using engineering software, and the developed positioning fixture bracket is placed on the straight line segment of the catheter plane projection until the axis of the positioning fixture base coincides with the center line of the tube projection. The calculation method for the number of positioning fixture brackets is shown in the following formula. When the straight line segment of the part is less than 20mm, the positioning bracket can be omitted.

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

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

[0016] Place the catheter positioning devices at the projection position of the pipe, and make the axis of the base of the positioning fixture coincide with the center line of the pipe projection. The offset angle α of the bracket and the height L1 of the adjustment support need to be obtained. 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 deviation 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 catheter from the magnetic base.

[0023] Step 4: Mark parameter information.

[0024] Create a frame in the projection area in the engineering software, take the lower left corner of the frame as the reference origin, and 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, the height position information of the pillar, the angle position information of the bracket, etc. on the metal platform.

[0025] Step 5: Adjust the positioning fixture.

[0026] According to step 3, first fix the positioning fixture device at 1, then press the switch, the height motor will automatically adjust the height position of the adjustment support according to the height of the tube projection in the model, and the height value during height adjustment can be displayed at all times 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.

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

[0028] ΔL1=2πnr1t1

[0029] in,

[0030] n is the motor speed

[0031] r1 is the height motor gear radius

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

[0033] The calculation formula of 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] Beneficial effects of the present invention:

[0041] The method provides a method for quickly and accurately manufacturing a flexible positioning device according to a model, and can accurately and effectively control the shape of the catheter parts. At the same time, the positioning device can be repeatedly assembled and used. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0043] Figure 2 It is a left side view of the positioning fixture device;

[0044] Figure 3 Place a schematic for the base of the device;

[0045] Figure 4 It is the key parameter schematic diagram;

[0046] Figure 5 This is a physical picture of the parts;

[0047] Figure 6It is the main view of the part and the height measurement diagram;

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

[0049] In the figure: 1 base, 2 switch slide, 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 DESCRIPTION

[0050] To bend the conduit parts ( Figure 5 ) as an example to explain the actual operation.

[0051] 1. Place the catheter parts and the platform base model on the same interface, and use the projection function in the 3D software to make the overall top view and front view (such as Figure 6 and Figure 7 ).

[0052] 2. According to the appearance characteristics of the catheter parts, the base position of the positioning fixture can be drawn on the top view of the overall system. The system identifies the center line of the catheter straight area on the top view, matches the base shape with the center line, and projects the midline point position of the base onto the platform of the front view. The height distance between the two bases and the selected point of the part is obtained by plane measurement, which is the h value in step 3. From this, the angle α value of the bracket and the height L1 value of the adjustment support can be obtained.

[0053] 3. Export the device base position information in the engineering software, including XY coordinates, support height, and bracket angle information. Mark the base position on the metal platform according to the XY coordinate information of the base, and mark the support height position information and bracket angle position information at nearby locations.

[0054] 4. Place the printing paper on the metal operating platform, place the positioning device base in the printing base frame, and turn the magnetic switch so that the positioning device is firmly adsorbed on the metal operating table.

[0055] 5. Press and hold the switch button to adjust the height of the support column. At the same time, the height position display on the grating ruler will display the top height of the support column in real time. When the displayed value is equal to the height parameter information on the bottom plate, it stops rising. Adjust the angle and turn the motor so that the angle value in the angle value display is equal to the angle parameter information on the bottom plate. When the height value and angle value are adjusted, the current positioning device is debugged and the next device can be adjusted.

[0056] 6. When all the positioning devices are adjusted, the overall positioning system is overlapped, and the appearance of the catheter parts is inspected according to the current positioning system environment, and the welding parts are repaired and matched.

Claims

1. A precise positioning method based on a catheter model, characterized in that: Here are the steps: Step 1: Develop a device for a special catheter positioning fixture, including: a main load-bearing component, a positioning device magnetic base component, and a digital display component; The main load-bearing component comprises a main support (7) and an adjusting support (9), which are connected by a shaft sleeve; the main support (7) has a built-in height motor (6), the height motor and the angle motor (14) are controlled by a switch (5), the height motor (6) drives a chain (8) to adjust the height position of the adjusting support (9), and the chain (8) and the adjusting support (9) are fixed together; Step 2: Determine the position of the base of the catheter positioning device; The three-dimensional model of the catheter part is projected on a plane using engineering software, and the developed positioning fixture bracket is placed on the straight line segment of the catheter plane projection until the axis of the positioning fixture base coincides with the center line of the tube projection; the number of positioning fixture brackets is calculated as 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 position of the catheter bracket and adjust the height position of the support; Place the catheter positioning devices at the projection position of the pipe, and make the axis of the base of the positioning fixture coincide with the center line of the pipe projection. The offset angle α of the bracket and the height L1 of the adjustment support need to be obtained. The offset angle α is the angle between the pipe projection line and the horizontal line. The calculation method of L1 is as shown in formula (2): in, α is the deviation angle; L2 is the length of the bracket; L1 is for adjusting the height of the support rod; h is the height of the catheter from the magnetic base; Step 4: Mark parameter information; Create a frame in the projection area of ​​the engineering software, take the lower left corner of the frame as the reference origin, and 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, the height position information of the pillar, the angle position information of the bracket, etc. on the metal platform; Step 5: Adjust the positioning fixture; According to step 3, first fix the positioning fixture device at 1, then press the switch, the height motor will automatically adjust the height position of the adjustment support according to the height of the tube projection in the model, and the height value during height adjustment can be displayed at all times 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 height change calculation formula (3) of the adjustment support is as follows: ΔL1=2πnr1t1 (3) in, n is the motor speed; r1 is the height motor gear radius; t1 is the rotation time of the height motor; The calculation formula (4) for the angle change of the bracket is as follows: in, n is the motor speed; 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 the catheter model according to claim 1, characterized in that: The magnetic base component of the positioning device comprises a base (1), 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 claimed in claim 1 or 2, characterized in that: The digital display component is composed 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 adjustment 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 claimed in claim 1 or 2, characterized in that: In the step 2, when the straight section of the part is less than 20 mm, the positioning bracket is not placed.

5. The precise positioning method based on a catheter model as claimed in claim 3, characterized in that: In the step 2, when the straight section of the part is less than 20 mm, the positioning bracket is not placed.

6. A precise positioning method based on a catheter model as claimed in claim 1, 2 or 5, characterized in that: The angle motor (14) drives the gear shaft (15), and the gear shaft (15) is fixed to the bracket (16). The rotation of the gear shaft (15) can drive the bracket (16) to rotate.

7. The precise positioning method based on a catheter model as claimed in claim 3, characterized in that: The angle motor (14) drives the gear shaft (15), and the gear shaft (15) is fixed to the bracket (16). The rotation of the gear shaft (15) can drive the bracket (16) to rotate.

8. The precise positioning method based on a catheter model as claimed in claim 4, characterized in that: The angle motor (14) drives the gear shaft (15), and the gear shaft (15) is fixed to the bracket (16). The rotation of the gear shaft (15) can drive the bracket (16) to rotate.

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