CN118328944A - Airbag bracket contour detection device and detection method - Google Patents

Abstract

The invention provides an airbag bracket contour detection device and a detection method, wherein the airbag bracket contour detection device comprises a fixed base, two sliding upright posts, an upper sliding ring and a lower sliding ring are sleeved on each sliding upright post in a sliding way, the tail ends of the two upper sliding ring are inserted into an upper supporting rod, the tail ends of the two lower sliding rings are inserted into a lower supporting rod, a sliding rail upper fixing block is sleeved on the upper supporting rod in a sliding way, a sliding rail lower fixing block is sleeved on the lower supporting rod in a sliding way, the sliding rail upper fixing block and the sliding rail lower fixing block are arranged in first track grooves on two sides of a double-groove sliding rail in a sliding way, a measuring probe is arranged in second track grooves in the middle of the double-groove sliding rail in a sliding way, and the bottom of each sliding upright post can slide in the fixed base along the direction parallel to the upper supporting rod and the lower supporting rod.

Description

Airbag bracket contour detection device and detection method

Technical Field

The invention relates to the field of metrology and detection, and in particular to a safety airbag bracket contour detection device and a detection method.

Background technique

The airbag assembly generally has a shell and a lower mounting bracket. When the airbag ignites and expands, a large reverse impact force will be generated on the mounting bracket. In the prior art, the airbag mounting bracket is usually a rigid structure. The rigid airbag bracket cannot absorb the reverse impact force and is likely to cause deformation or breakage. At the same time, there is no relevant detection device and detection method for the airbag bracket in the prior art, which cannot ensure that the airbag bracket contour is qualified, resulting in irregular airbag installation.

Summary of the invention

The present invention provides a safety airbag bracket contour detection device, which is characterized by comprising a fixed base, two sliding columns, an upper sliding ring and a lower sliding ring are slidably sleeved on each sliding column, the ends of the two upper sliding rings are inserted into the upper support rod, the ends of the two lower sliding rings are inserted into the lower support rod, an upper fixed block of the slide rail is slidably sleeved on the upper support rod, and a lower fixed block of the slide rail is slidably sleeved on the lower support rod, the upper fixed block of the slide rail and the lower fixed block of the slide rail are slidably set in the first track grooves on both sides of the double-groove slide rail, the measuring probe is slidably set in the second track groove in the middle of the double-groove slide rail, and the bottom of the sliding column can slide in the fixed base along a direction parallel to the upper support rod and the lower support rod;

The upper sliding ring includes an upper sliding sleeve, an upper telescopic rod, and an upper support rod fixing ring, and the lower sliding ring includes a lower sliding sleeve, a lower telescopic rod, and a lower support rod fixing ring;

The airbag bracket includes two vertical fixing plates, each of which is rotatably mounted with an airbag mounting plate, the airbag mounting plate is provided with a mounting hole connected to the airbag, and each vertical fixing plate is provided with an axial hole, an arc-shaped slide groove, a support plate, and a leaf spring. Preferably, a first telescopic rod is connected between the first moving block and the second moving block, and a second telescopic rod is connected between the third moving block and the fourth moving block.

Preferably, the arc-shaped slide groove of the airbag bracket has the axial hole as the center, and the two ends are semi-circular. The center of the axial hole and the center of the upper semi-circular arc of the arc-shaped slide groove are located in the same horizontal plane. The setting direction of the support plate coincides with the direction of the line connecting the center of the axial hole and the center of the upper semi-circular arc of the arc-shaped slide groove. One end of the airbag mounting plate is connected to the axial hole through a first axis, and the other end is connected to the arc-shaped slide groove through a second axis.

Preferably, the signal emission direction of the measuring probe is perpendicular to the double-groove slide rail.

Preferably, the sliding column, the upper telescopic rod and the lower telescopic rod are all provided with a size display structure.

Preferably, the upper fixed block and the lower fixed block of the slide rail have exactly the same structure, both having upper and lower planes parallel to each other, through holes for the upper support rod and the lower support rod are formed between the upper and lower planes, and the upper and lower planes are perpendicular to the double-groove slide rail.

Preferably, the first shaft and the shaft hole are clearance-fitted, and the second shaft and the arc-shaped sliding groove are interference-fitted.

Preferably, the airbag support profile detection device is installed as follows:

Step 1: Rough positioning:

Pass the upper support rod through the upper support rod fixing ring on one side, the arc-shaped slide groove on one side, the fixing block on the slide rail, the arc-shaped slide groove on the other side, and the upper support rod fixing ring on the other side in sequence;

Pass the lower support rod through the lower support rod fixing ring on one side, the arc-shaped slide groove on one side, the lower fixing block of the slide rail, the arc-shaped slide groove on the other side, and the lower support rod fixing ring on the other side in sequence;

Tighten the upper sliding sleeve and the lower sliding sleeve on both sides;

Step 2: Precise positioning:

Loosen the upper sliding sleeve on one side, move the upper sliding sleeve on one side upward until the upper support rod abuts against the upper end of the arc-shaped sliding groove on one side, and tighten the upper sliding sleeve on one side again;

Loosen the upper sliding sleeve on the other side, and move the upper sliding sleeve on the other side upward until the upper support rod abuts against the upper end of the arc-shaped sliding groove on the other side, and tighten the upper sliding sleeve on the other side again;

Loosen the lower sliding sleeve on one side, and move the lower sliding sleeve on one side downward until the lower support rod abuts against the lower end of the arc-shaped sliding groove on one side, and tighten the lower sliding sleeve on one side again;

Loosen the lower slide sleeve on the other side, and move the lower slide sleeve on the other side downward until the lower support rod abuts against the lower end of the arc-shaped slide groove on the other side, and tighten the lower slide sleeve on the other side again;

Step 3: Install the double-slot rails:

Insert the double-slot guide rail into the upper guide rail fixing block and the lower guide rail fixing block in sequence and tighten them into place.

The present invention also provides a method for detecting the contour of an airbag bracket, which is characterized in that the method comprises the following specific steps:

S1: Measure the center position of the arc of the arc-shaped chute on one side and the center position of the axial hole on one side, and determine whether the position errors of the two are within the threshold range; measure the center position of the arc of the arc-shaped chute on the other side and the center position of the axial hole on the other side, and determine whether the position errors of the two are within the threshold range; measure the radius of the arc-shaped chute on both sides, and determine whether the radius errors of the two are within the threshold range; if the result of any of the above judgments is no, it is determined that the profile of the airbag bracket is unqualified, and if the errors are all within the threshold range, enter step S2;

S2: placing a level in the direction of the line connecting the center of the shaft hole and the center of the semicircular arc at the upper end of the arc-shaped slide groove, and judging whether the center of the shaft hole and the center of the semicircular arc at the upper end of the arc-shaped slide groove are located on the same horizontal plane, if not, judging that the profile of the airbag bracket is unqualified, if yes, proceeding to step S3;

S3: Install the airbag bracket contour device, move the upper fixing block and the lower fixing block of the slide rail to fit with the vertical fixing plate on one side, and read the height values of the upper sliding sleeves on both sides, the height values of the lower sliding sleeves on both sides, the length values of the upper telescopic rods on both sides, and the length values of the lower telescopic rods, and judge whether the height value errors of the upper sliding sleeves on both sides are within the threshold range, whether the height value errors of the lower sliding sleeves on both sides are within the threshold range, whether the length value errors of the upper telescopic rods on both sides are within the threshold range, whether the length value errors of the lower telescopic rods are within the threshold range, and whether the length value errors of the lower telescopic rods are within the threshold range. If any value comparison process finds that it exceeds the threshold range, it is judged that the airbag bracket contour is unqualified. If the errors are all within the threshold range, enter step S4;

S4: Set a signal receiving point A at the center of the shaft hole, set signal receiving points B and C at both ends of the support plate, drive the measuring probe to move along the second track groove, take the upper plane _F1 of the fixed block on the slide rail as the starting point of numerical recording, and take the lower plane _F2 of the fixed block under the slide rail as the end point of numerical recording; record the signal transmitting point positions _A1 , _B1 , _C1 where the signals emitted by the measuring probe on the moving path are received by the signal receiving points A, B, and C; determine whether the stroke S _F1A1 between _F1 and _A1 is equal to the stroke S _F2A2 . If not, determine that the profile of the airbag bracket is unqualified. If equal, proceed to step S5;

S5: Record the distance S _A1A between the signal receiving point A and the signal transmitting point _A1 , measure the distance S _B1B between the signal receiving point A and the signal receiving point B and the signal transmitting point _B1 , the distance S _C1C between the signal receiving point C and the signal transmitting point _C1 , and the distance S _B1C1 between the signal transmitting point _B1 and the signal transmitting point _C1 , and determine whether the above distances satisfy the following numerical relationship:

( _SB1B - _SC1C )/ _SB1C1 = _SA1A / _SF2A2

If not, the airbag bracket profile is judged to be unqualified; if satisfied, the airbag bracket profile is judged to be qualified.

The present invention can achieve the following beneficial effects:

1. Based on the shape characteristics of the airbag bracket, a contour detection device and method for the airbag bracket are set to ensure that the size of the airbag bracket meets the requirements.

2. The contour detection device of the present invention can detect part of the contour during the device installation process, which is convenient for detection. In addition, a sliding adjustment structure is provided to adapt to airbag brackets of various sizes.

3. The airbag bracket of the present invention can firmly fix the airbag, and during the explosion of the airbag, the leaf spring deforms to absorb the reverse impact force of the explosion, thereby reducing the instantaneous impact force on the airbag bracket and avoiding deformation of the airbag bracket.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a first view of a device for detecting the contour of an airbag support according to the present invention;

FIG2 is a second view of the airbag support profile detection device of the present invention;

FIG3 is a partial view of the airbag support profile detection device of the present invention;

FIG4 is a first view of the airbag support of the present invention;

FIG5 is a second view of the airbag support of the present invention;

FIG6 is a partial view of the airbag support of the present invention;

FIG. 7 is a diagram showing the detection principle of the present invention.

Detailed ways

Referring to Figures 1-3 of the specification, the airbag bracket contour detection device of the present invention includes a fixed base 1, two sliding columns 2, each sliding column 2 is slidably sleeved with an upper sliding ring 3 and a lower sliding ring 4, the ends of the two upper sliding rings 3 are inserted into the upper support rod 5, and the ends of the two lower sliding rings 4 are inserted into the lower support rod 6, the upper support rod 5 is slidably sleeved with a slide rail upper fixing block 7, and the lower support rod 6 is slidably sleeved with a slide rail lower fixing block 8, the slide rail upper fixing block 7 and the slide rail lower fixing block 8 are slidably sleeved in the first track groove 9-1 on both sides of the double-groove slide rail 9, and the measuring probe 10 is slidably set in the second track groove 9-2 in the middle of the double-groove slide rail 9, the bottom of the sliding column 2 can slide in the fixed base 1 along a direction parallel to the upper support rod 5 and the lower support rod 6 (not shown in the figure), and the signal emission direction of the measuring probe 10 is perpendicular to the double-groove slide rail 9.

Referring to Figures 4-6 of the specification, the airbag bracket of the present invention includes two vertical fixing plates 11, each of which is rotatably mounted with an airbag mounting plate 12, the airbag mounting plate 12 is provided with a mounting hole connected to the airbag, each vertical fixing plate 11 is provided with an axial hole 11-1, an arc-shaped slide groove 11-2, a support plate 11-3, and a leaf spring 11-4, wherein the arc-shaped slide groove 11-2 takes the axial hole 11-1 as the center of the circle, and the two ends are semicircular, and the center of the axial hole 11-1 and the center of the semicircular arc at the upper end of the arc-shaped slide groove 11-2 are located at the same A horizontal plane, the setting direction of the support plate 11-3 coincides with the direction of the line connecting the center of the shaft hole 11-1 and the center of the upper semicircular arc of the arc-shaped slide groove 11-2, one end of the airbag mounting plate 12 is connected to the shaft hole 11-1 through the first shaft 13, and the other end is connected to the arc-shaped slide groove 11-2 through the second shaft 14, the first shaft 13 and the shaft hole 11-1 have a clearance fit, and the second shaft 14 and the arc-shaped slide groove 11-2 have an interference fit, and the interference fit can be adjusted based on the actual working conditions such as the vehicle model and the shape of the airbag, and a leaf spring 11-4 is arranged between the support plate 11-3 and the airbag mounting plate 12.

When the airbag is in a non-operating state, the airbag is firmly positioned due to the interference fit between the second shaft 14 and the arc-shaped slide groove 11-2 and the upward elastic force exerted by the leaf spring 11-4 on the airbag mounting plate 12. At the moment of the airbag explosion, due to the effect of the reverse impact force, the second shaft 14, which was originally in an interference fit, will slide along the arc-shaped slide groove 11-2, and the airbag will also rotate with the airbag mounting plate 12 around the first shaft 13 as the axis, and the leaf spring 11-4 will be biased downward during the rotation process, and the leaf spring 11-4 will deform to absorb the reverse impact force, thereby preventing the vertical fixing plate 11 and the airbag mounting plate 12 from being deformed due to the reverse impact force at the moment of the airbag explosion. The arc-shaped slide groove 11-2 takes the shaft hole 11-1 as the center of the circle to avoid the arc-shaped slide groove 11-2 interfering with the rotational movement of the airbag with the first axis 13 as the axis. The center of the shaft hole 11-1 and the center of the upper semicircular arc of the arc-shaped slide groove 11-2 are located in the same horizontal plane to facilitate the installation and positioning of the airbag. The setting direction of the support plate 11-3 coincides with the direction of the line connecting the center of the shaft hole 11-1 and the center of the lower semicircular arc of the arc-shaped slide groove 11-2 to avoid interference between the airbag mounting plate 12 and the support plate 11-3 during rotation.

Referring to Figure 2 of the specification, the upper sliding ring 3 of the airbag support profile detection device of the present invention further includes an upper sliding sleeve 3-1, an upper telescopic rod 3-2, and an upper support rod fixing ring 3-3, and the lower sliding ring 4 further includes a lower sliding sleeve 4-1, a lower telescopic rod 4-2, and a lower support rod fixing ring 4-3. The sliding column 2, the upper telescopic rod 3-2, and the lower telescopic rod 4-2 are all provided with a size display structure, such as a scale line. In addition, all the sliding structures of the present invention are provided with a positioning device known in the prior art, which is used for positioning after sliding adjustment, such as screws, snap rings, etc. (not shown in the figure).

To ensure accurate measurement, during the processing of the upper support rod 5 and the lower support rod 6, the diameters of the two support rods are required to be equal, and both are equal to the diameters of the upper semicircular arc and the lower semicircular arc of the arc-shaped slide groove 11-2.

The installation method of the airbag support profile detection device of the present invention is as follows:

Step 1: Rough positioning:

The upper support rod 5 is sequentially passed through the upper support rod fixing ring 3-3 on one side, the arc-shaped slide groove 11-2 on one side, the fixing block 7 on the slide rail, the arc-shaped slide groove 11-2 on the other side, and the upper support rod fixing ring 3-3 on the other side;

The lower support rod 6 is sequentially passed through the lower support rod fixing ring 4-3 on one side, the arc-shaped slide groove 11-2 on one side, the lower fixing block 8 of the slide rail, the arc-shaped slide groove 11-2 on the other side, and the lower support rod fixing ring 4-3 on the other side;

Tighten the upper sliding sleeve 3-1 and the lower sliding sleeve 4-1 on both sides.

During the rough positioning process, the upper support rod 5 and the lower support rod 6 are initially positioned in the arc-shaped slide groove 11 - 2 to ensure that the airbag bracket contour detection device is relatively fixed without sliding or deflection.

Step 2: Precise positioning:

Loosen the upper sliding sleeve 3-1 on one side, and move the upper sliding sleeve 3-1 on one side upward until the upper support rod 5 abuts against the upper end of the arc-shaped sliding groove 11-2 on one side, and tighten the upper sliding sleeve 3-1 on one side again;

Loosen the upper sliding sleeve 3-1 on the other side, and move the upper sliding sleeve 3-1 on the other side upward until the upper support rod 5 abuts against the upper end of the arc-shaped sliding groove 11-2 on the other side, and tighten the upper sliding sleeve 3-1 on the other side again;

Loosen the lower slide sleeve 4-1 on one side, and move the lower slide sleeve 4-1 on one side downward until the lower support rod 6 abuts against the lower end of the arc-shaped slide groove 11-2 on one side, and tighten the lower slide sleeve 4-1 on one side again;

Loosen the lower slide sleeve 4-1 on the other side, and move the lower slide sleeve 4-1 on the other side downward until the lower support rod 6 abuts against the lower end of the arc-shaped slide groove 11-2 on the other side, and tighten the lower slide sleeve 4-1 on the other side again.

Step 3: Install the double-slot rails:

Insert the double-groove slide rail 9 into the upper slide rail fixing block 7 and the lower slide rail fixing block 8 in sequence, and tighten them in place.

Referring to Figure 2 of the specification, the upper fixing block 7 and the lower fixing block 8 of the slide rail of the airbag bracket contour detection device of the present invention are exactly the same in structure, and both have upper and lower planes parallel to each other, and through holes of the upper support rod 5 and the lower support rod 6 are formed between the upper and lower planes, and the upper and lower planes are perpendicular to the double-groove slide rail 9. Since the upper support rod 5 abuts against the upper end of the arc-shaped slide groove 11-2, and the lower support rod 6 abuts against the lower end of the arc-shaped slide groove 11-2 on the other side, the fixing direction of the double-groove slide rail 9 after installation is the same as the direction of the connection line at the two ends of the arc-shaped slide groove 11-2, and the measuring probe 10 will also move along the path of the direction of the connection line at the two ends of the arc-shaped slide groove 11-2.

Since the detection device structures of the present invention are all movable structures, they can adapt to airbag mounting brackets of different sizes.

The present invention also relates to a method for detecting the contour of an airbag support. Referring to FIG7 of the specification, which is a detection principle diagram of the present invention, arrows are used to indicate the signal emission direction of the measuring probe 10 during the travel. The specific steps are as follows:

S1: Measure the center position of the arc of the arc-shaped slide groove 11-2 on one side and the center position of the axis hole 11-1 on one side, and determine whether the position error of the two is within the threshold range; measure the center position of the arc of the arc-shaped slide groove 11-2 on the other side and the center position of the axis hole 11-1 on the other side, and determine whether the position error of the two is within the threshold range; measure the radius of the arc-shaped slide grooves 11-2 on both sides, and determine whether the radius error of the two is within the threshold range; if the result of any of the above judgments is no, it is determined that the profile of the airbag bracket is unqualified, and if the errors are all within the threshold range, enter step S2;

S2: placing a level gauge in the direction of the line connecting the center of the shaft hole 11-1 and the center of the upper semicircular arc of the arc-shaped slide groove 11-2, and judging whether the center of the shaft hole 11-1 and the center of the upper semicircular arc of the arc-shaped slide groove 11-2 are located on the same horizontal plane. If not, judging that the profile of the airbag bracket is unqualified, if so, proceeding to step S3;

S3: Install the airbag bracket contour device, move the upper fixing block 7 and the lower fixing block 8 of the slide rail to fit with the vertical fixing plate 11 on one side, and read the height values of the upper sliding sleeves 3-1 on both sides, the height values of the lower sliding sleeves 4-1 on both sides, the length values of the upper telescopic rods 3-2 on both sides, and the length values of the lower telescopic rods 4-2, and judge whether the height value errors of the upper sliding sleeves 3-1 on both sides are within the threshold range, whether the height value errors of the lower sliding sleeves 4-1 on both sides are within the threshold range, whether the length value errors of the upper telescopic rods 3-2 on both sides are within the threshold range, whether the length value errors of the lower telescopic rods 4-2 are within the threshold range. If it is found that the threshold range is exceeded during the value comparison process, it is judged that the airbag bracket contour is unqualified. If the errors are all within the threshold range, enter step S4;

S4: Set a signal receiving point A at the center of the shaft hole 11-1, set signal receiving points B and C at both ends of the support plate 11-3, drive the measuring probe 10 to move along the second track groove 9-2, take the upper plane _F1 of the fixed block 7 on the slide rail as the starting point of the numerical recording, and take the lower plane _F2 of the fixed block 8 under the slide rail as the end point of the numerical recording; record the signal transmitting point positions _A1 , _B1 , _C1 of the signal transmitted by the measuring probe 10 on the moving path and received by the signal receiving points A, B, C; determine whether the stroke S _F1A1 between _F1 and _A1 is equal to the stroke S _F2A2 , if not equal, determine that the airbag bracket profile is unqualified, if equal, enter step S5;

S5: Record the distance S _A1A between the signal receiving point A and the signal transmitting point _A1 , measure the distance S _B1B between the signal receiving point A and the signal receiving point B and the signal transmitting point _B1 , the distance S _C1C between the signal receiving point C and the signal transmitting point _C1 , and the distance S _B1C1 between the signal transmitting point _B1 and the signal transmitting point _C1 , and determine whether the above distances satisfy the following numerical relationship:

( _SB1B - _SC1C )/ _SB1C1 = _SA1A / _SF2A2

If not, the airbag bracket profile is judged to be unqualified; if satisfied, the airbag bracket profile is judged to be qualified.

Step S4 is a further verification of the measurement result of step S1 to ensure the measurement is accurate. The measurement method in step S1 is a prior art and will not be described in detail.

The above steps are a method for detecting the contour of one side of the airbag bracket. If the contour of the other side needs to be detected, it is only necessary to move the upper fixing block 7 and the lower fixing block 8 of the slide rail to fit with the vertical fixing plate 11 on the other side.

The above descriptions are merely embodiments of the present invention and do not limit the patent scope of the present invention; any equivalent methods or structures made using the contents of the present invention are included in the patent protection scope of the present invention.

Claims (8)

1. A device for detecting the contour of a safety airbag support, characterized in that it comprises a fixed base, two sliding columns, an upper sliding ring and a lower sliding ring are slidably sleeved on each sliding column, the ends of the two upper sliding rings are inserted into the upper support rod, the ends of the two lower sliding rings are inserted into the lower support rod, an upper fixed block of the slide rail is slidably sleeved on the upper support rod, a lower fixed block of the slide rail is slidably sleeved on the lower support rod, the upper fixed block of the slide rail and the lower fixed block of the slide rail are slidably set in the first track grooves on both sides of the double-groove slide rail, the measuring probe is slidably set in the second track groove in the middle of the double-groove slide rail, and the bottom of the sliding column can slide in the fixed base along a direction parallel to the upper support rod and the lower support rod; The upper sliding ring includes an upper sliding sleeve, an upper telescopic rod, and an upper support rod fixing ring, and the lower sliding ring includes a lower sliding sleeve, a lower telescopic rod, and a lower support rod fixing ring; The airbag bracket includes two vertical fixing plates, each of which has an airbag mounting plate rotatably mounted horizontally, and the airbag mounting plate is provided with mounting holes connected to the airbag. Each vertical fixing plate is provided with an axial hole, an arc-shaped slide groove, a support plate, and a leaf spring. 2. A safety airbag bracket contour detection device as described in claim 1, characterized in that the arc-shaped slide groove of the safety airbag bracket has the axial hole as the center of the circle, and the two ends are semi-circular, the center of the axial hole and the center of the semi-circular arc at the upper end of the arc-shaped slide groove are located in the same horizontal plane, the setting direction of the support plate coincides with the direction of the line connecting the center of the axial hole and the center of the semi-circular arc at the upper end of the arc-shaped slide groove, one end of the airbag mounting plate is connected to the axial hole through a first axis, and the other end is connected to the arc-shaped slide groove through a second axis. 3. An airbag bracket contour detection device as described in claim 1, characterized in that the signal emission direction of the measuring probe is perpendicular to the double-groove slide rail. 4. An airbag bracket contour detection device as described in claim 1, characterized in that a size display structure is provided on the sliding column, the upper telescopic rod and the lower telescopic rod. 5. A safety airbag bracket contour detection device as described in claim 1, characterized in that the upper fixed block and the lower fixed block of the slide rail have exactly the same structure and both have upper and lower planes parallel to each other, through holes for the upper support rod and the lower support rod are formed between the upper and lower planes, and the upper and lower planes are perpendicular to the double-groove slide rail. 6. A safety airbag bracket contour detection device as claimed in claim 2, characterized in that the first shaft and the shaft hole are clearance-fitted, and the second shaft and the arc-shaped slide groove are interference-fitted. 7. The airbag support profile detection device according to claim 2, characterized in that the airbag support profile detection device is installed as follows: Step 1: Rough positioning: Pass the upper support rod through the upper support rod fixing ring on one side, the arc-shaped slide groove on one side, the fixing block on the slide rail, the arc-shaped slide groove on the other side, and the upper support rod fixing ring on the other side in sequence; Pass the lower support rod through the lower support rod fixing ring on one side, the arc-shaped slide groove on one side, the lower fixing block of the slide rail, the arc-shaped slide groove on the other side, and the lower support rod fixing ring on the other side in sequence; Tighten the upper sliding sleeve and the lower sliding sleeve on both sides; Step 2: Precise positioning: Loosen the upper sliding sleeve on one side, move the upper sliding sleeve on one side upward until the upper support rod abuts against the upper end of the arc-shaped sliding groove on one side, and tighten the upper sliding sleeve on one side again; Loosen the upper sliding sleeve on the other side, and move the upper sliding sleeve on the other side upward until the upper support rod abuts against the upper end of the arc-shaped sliding groove on the other side, and tighten the upper sliding sleeve on the other side again; Loosen the lower sliding sleeve on one side, and move the lower sliding sleeve on one side downward until the lower support rod abuts against the lower end of the arc-shaped sliding groove on one side, and tighten the lower sliding sleeve on one side again; Loosen the lower slide sleeve on the other side, and move the lower slide sleeve on the other side downward until the lower support rod abuts against the lower end of the arc-shaped slide groove on the other side, and tighten the lower slide sleeve on the other side again; Step 3: Install the double-slot rails: Insert the double-slot guide rail into the upper guide rail fixing block and the lower guide rail fixing block in sequence and tighten them into place. 8. A method for detecting the contour of an airbag support, characterized in that: using the airbag support contour detection device according to any one of claims 1 to 7, the method comprises the following specific steps: S1: Measure the center position of the arc of the arc-shaped chute on one side and the center position of the axial hole on one side, and determine whether the position errors of the two are within the threshold range; measure the center position of the arc of the arc-shaped chute on the other side and the center position of the axial hole on the other side, and determine whether the position errors of the two are within the threshold range; measure the radius of the arc-shaped chute on both sides, and determine whether the radius errors of the two are within the threshold range; if the result of any of the above judgments is no, it is determined that the profile of the airbag bracket is unqualified, and if the errors are all within the threshold range, enter step S2; S2: placing a level in the direction of the line connecting the center of the shaft hole and the center of the semicircular arc at the upper end of the arc-shaped slide groove, and judging whether the center of the shaft hole and the center of the semicircular arc at the upper end of the arc-shaped slide groove are located on the same horizontal plane, if not, judging that the profile of the airbag bracket is unqualified, if yes, proceeding to step S3; S3: Install the airbag bracket contour device, move the upper fixing block and the lower fixing block of the slide rail to fit with the vertical fixing plate on one side, and read the height values of the upper sliding sleeves on both sides, the height values of the lower sliding sleeves on both sides, the length values of the upper telescopic rods on both sides, and the length values of the lower telescopic rods, and judge whether the height value errors of the upper sliding sleeves on both sides are within the threshold range, whether the height value errors of the lower sliding sleeves on both sides are within the threshold range, whether the length value errors of the upper telescopic rods on both sides are within the threshold range, whether the length value errors of the lower telescopic rods are within the threshold range, and whether the length value errors of the lower telescopic rods are within the threshold range. If any value comparison process finds that it exceeds the threshold range, it is judged that the airbag bracket contour is unqualified. If the errors are all within the threshold range, enter step S4; S4: Set a signal receiving point A at the center of the shaft hole, set signal receiving points B and C at both ends of the support plate, drive the measuring probe to move along the second track groove, take the upper plane _F1 of the fixed block on the slide rail as the starting point of numerical recording, and take the lower plane _F2 of the fixed block under the slide rail as the end point of numerical recording; record the signal transmitting point positions _A1 , _B1 , _C1 where the signals emitted by the measuring probe on the moving path are received by the signal receiving points A, B, and C; determine whether the stroke S _F1A1 between _F1 and _A1 is equal to the stroke S _F2A2 . If not, determine that the profile of the airbag bracket is unqualified. If equal, proceed to step S5; S5: Record the distance S _A1A between the signal receiving point A and the signal transmitting point _A1 , measure the distance S _B1B between the signal receiving point A and the signal receiving point B and the signal transmitting point _B1 , the distance S _C1C between the signal receiving point C and the signal transmitting point _C1 , and the distance S _B1C1 between the signal transmitting point _B1 and the signal transmitting point _C1 , and determine whether the above distances satisfy the following numerical relationship: ( _SB1B - _SC1C )/ _SB1C1 = _SA1A / _SF2A2 If not, the airbag bracket profile is judged to be unqualified; if satisfied, the airbag bracket profile is judged to be qualified.