1. The utility model provides a measuring device of aircraft hatch door flexibility which characterized in that: the device comprises a support plate, 2 support legs and a measuring rod; fix with screw on the extension board for two landing legs, be carved with the scale on the measuring stick and be used for measuring the reading, the measuring stick passes the clearing hole at extension board middle part, and is equipped with fixed stopper on the measuring stick, sets up the spring between extension board and the stopper.

2. A device for measuring aircraft door deflection according to claim 1, wherein: the landing leg is rotatable accomodate, with the extension board laminating.

3. A device for measuring aircraft door deflection according to claim 1, wherein: the measuring device also comprises a sheath, wherein the sheath is respectively arranged at the end parts of the supporting legs, the measuring rod and the machine body which are in contact with each other in shape.

4. A device for measuring aircraft door deflection according to claim 1, wherein: the measuring rod is a cuboid, the shape of the measuring rod is matched with that of the through hole in the support plate, and scale marks are arranged on two side faces of the measuring rod.

5. A device for measuring aircraft door deflection according to claim 1, wherein: the length of the support plate is wider than the width of each cabin door, and the length of the measuring rod is larger than that of the support leg.

6. A method for measuring the flexibility of an airplane cabin door is characterized by comprising the following steps:

1) before the cabin is inflated, marks are made on the door frame edges and the middle part of the door on the two sides, the supporting legs and the measuring rod of the deflection measuring device are respectively abutted against the made marks, and the exposure size h of a scale on the measuring rod is recorded;

2) after the cabin is inflated to a target pressure value, recording the scale exposure dimension H on the measuring rod again according to the step 1);

3) the difference of the two measured data is approximately equal to the deflection of the middle part of the door, the deformation of the sealing rubber strip and the deformation of the airtight belt of the boarding door;

4) the deformation of the sealing rubber strip before and after inflation is small and can be ignored;

5) the deformation of the airtight belt of the boarding gate is approximately equal to the variation d of the step difference of the boarding gate before and after inflation;

6) the deflection of the lower emergency door and the emergency outlets at the two sides of the machine body is approximately equal to H-H;

7) the deflection of the gate is approximately equal to H-H-d;

8) d, selecting the average value of the variation of the step difference on the two sides of the gate as the deformation of the airtight belt of the gate.

7. The method of claim 6, wherein the target pressure value in step 2) is 39.2 ± 2 kPa.

8. The method of claim 6, wherein in step 3), the sealant strip is XM28 sealant.

Background

The appearance and the relative position of each part of the assembled airplane are in accordance with the dimension and the tolerance specified by the design requirement. After each cabin door on the airplane is assembled, the step difference and the cabin door deflection meet the technical requirements of design. At present, after an airtight cabin is pressurized, the shapes of a cabin door and an airframe are deformed to different degrees, the deviation of the cabin door relative to the appearance of the airframe cannot be measured when a datum plane is lacked, an airtight belt is installed on the periphery of a boarding door, after the cabin is pressurized, the airtight belt has a certain compression amount, if a laser tracker is used for measurement, the deformation of each cabin door to the ground is measured, measurement data cannot visually represent the deflection of the cabin door, the work preparation time is long, the speciality is high, and the operation cannot be expanded to general operators.

Disclosure of Invention

When the airtight cabin of the airplane is in a pressurized state, the cabin door and the appearance of the airplane body are deformed to different degrees, the deviation of the cabin door relative to the appearance of the airplane body cannot be measured when the reference surface is lacked, the airtight belt is arranged on the periphery of the boarding door, and after the cabin is pressurized, the airtight belt has a certain compression amount which also influences deflection data.

The invention overcomes the defects in the prior art and provides the measuring device which is simple, convenient and easy to use and convenient to measure.

Technical scheme

As shown in fig. 1, a measuring device for the flexibility of an airplane door is provided, which comprises a support plate, 2 supporting legs and a measuring rod; fix with screw on the extension board for two landing legs, be carved with the scale on the measuring stick and be used for measuring the reading, the measuring stick passes the clearing hole at extension board middle part, and is equipped with fixed stopper on the measuring stick, sets up the spring between extension board and the stopper.

The landing leg is rotatable accomodate, with the extension board laminating.

The measuring device also comprises a sheath, wherein the sheath is respectively arranged at the end parts of the supporting legs, the measuring rod and the machine body which are in contact with each other in shape.

The measuring rod is a cuboid, the shape of the measuring rod is matched with that of the through hole in the support plate, and scale marks are arranged on two side faces of the measuring rod.

The length of the support plate is wider than the width of each cabin door, and the length of the measuring rod is larger than that of the support leg.

A method for measuring the flexibility of an airplane cabin door comprises the following steps:

1) before the cabin is inflated, marks are made on the door frame edges on the two sides and the middle part of the door, the supporting legs and the measuring rod of the deflection measuring device are respectively abutted against the made marks, and the exposure size h of a scale on the measuring rod is recorded.

2) And after the cabin is inflated to the target pressure value, recording the scale exposure dimension H on the measuring rod again according to 1).

3) The difference of the two measured data is approximately equal to the deflection of the middle part of the door, the deformation of the sealing rubber strip and the deformation of the airtight belt of the boarding door.

4) The deformation of the sealing rubber strip before and after inflation is small and can be ignored.

5) The deformation of the airtight belt of the boarding gate is approximately equal to the variation d of the step difference of the boarding gate before and after inflation.

6) The deflection of the lower emergency door and the emergency outlets on the two sides of the machine body is approximately equal to H-H.

7) The deflection of the gate is approximately equal to H-H-d.

8) d, selecting the average value of the variation of the step difference on the two sides of the gate as the deformation of the airtight belt of the gate.

The target pressure value in the 2) is 39.2 +/-2 kPa.

The sealing rubber strip in the step 3) is XM28 sealant.

Technical effects

The invention provides a deflection measuring device and a measuring method, wherein a supporting plate of the measuring device is made of an aluminum alloy section, so that the measuring device has better manufacturability and bearing capacity; the measuring rod is directly inserted into the through hole in the support plate, so that the flexibility of the measuring rod is improved; the supporting legs are fixed by screws, and after the screws are unscrewed, the supporting legs can be folded and combined with the straight plate, so that the size of the measuring device is reduced; when the device is used, the exposure of the scale on the measuring rod is only checked, and the measurement is visual; the support plate and the measuring rod are convenient to disassemble and assemble and simple to operate.

Drawings

FIG. 1 is a schematic structural diagram of a deflection measuring device;

FIG. 2 is an outline view of the plate;

fig. 3 is an outline view of the measuring rod.

Detailed Description

The invention discloses a deflection measuring device, which is described in detail with reference to the accompanying drawings:

as shown in fig. 1, a measuring device for the flexibility of an airplane door is provided, which comprises a support plate, 2 supporting legs and a measuring rod; fix with screw on the extension board for two landing legs, be carved with the scale on the measuring stick and be used for measuring the reading, the measuring stick passes the clearing hole at extension board middle part, and is provided with fixed stopper on the measuring stick, sets up the spring between extension board and the stopper.

The landing leg is rotatable accomodate, laminates with the extension board, is convenient for deposit.

The measuring device also comprises a sheath, wherein the sheath is respectively arranged at the end parts of the supporting legs, the measuring rod and the machine body which are in contact with each other in shape. The sheath plays the guard action, and the protection organism is not by the fish tail, can adopt the polyethylene material preparation, does not compressed when using.

The measuring rod is a cuboid, the shape of the measuring rod is matched with that of the through hole in the support plate, and scale marks are arranged on two side faces of the measuring rod. The 0 position of the scale mark can be arranged at one end of the measuring rod far away from the machine body, the length of the scale can not cover the measuring rod, but the support plate needs to be spanned by the scale after the measuring rod is combined with the straight plate.

The length of the support plate is wider than the width of each cabin door, and the length of the measuring rod is larger than that of the support leg. Landing leg length is no less than 100mm, is convenient for down emergency door and measures.

The deflection measurement method of the boarding gate, the lower emergency gate and the emergency exits at two sides of the machine body comprises the following steps:

1) before the cabin is inflated, marks are made on the door frame edges on the two sides and the middle part of the door, the supporting legs and the measuring rod of the deflection measuring device are respectively abutted against the made marks, and the exposure size h of a scale on the measuring rod is recorded.

2) And after the cabin is inflated to the target pressure value, recording the scale exposure dimension H on the measuring rod again according to 1).

3) The difference of the two measured data is approximately equal to the deflection of the middle part of the door, the deformation of the sealing rubber strip and the deformation of the airtight belt of the boarding door.

4) The deformation of the sealing rubber strip before and after inflation is small and can be ignored.

5) The deformation of the airtight belt of the boarding gate is approximately equal to the variation d of the step difference of the boarding gate before and after inflation.

6) The deflection of the lower emergency door and the emergency outlets on the two sides of the machine body is approximately equal to H-H.

7) The deflection of the gate is approximately equal to H-H-d.

8) d, selecting the average value of the variation of the step difference on the two sides of the gate as the deformation of the airtight belt of the gate.

The target pressure value in the 2) is 39.2 +/-2 kPa. In order to reduce the fluctuation range of the measured data of each machine and have more contrast, the inflation speed is controlled to keep the cabin pressure within the range of 40 +/-0.5 kPa during actual measurement.

The sealing rubber strip in the step 3) is XM 28. The XM28 sealant is generally used for riveting structures such as airtight and watertight region skins, stringers and frame borders of airplanes, and is painted between the structures to play the role of airtightness and watertightness. The lap joint of the airplane cabin door and the door frame is pressed by XM28 sealant, so that the cabin door can be tightly attached to the door frame after being closed, and the lap joint has good sealing property.