CN107284646A - A kind of driving cabin discrepancy doorway mount structure and its design method - Google Patents

Abstract

The present invention provides a kind of driving cabin discrepancy doorway mount structure and its design method, and wherein mouth mount structure is arranged at the requirement aperture position on floor panel, including mouth frame (1), machine add angle box joint (2), diaphragm plate (4)；The mouth frame (1) is segmented peripheral frame, including section is in I-shaped longitudinally reinforced beam and horizontal buttress brace；The segmented peripheral frame is arranged between door body periphery, each peripheral frame in groined type adds angle splice grafting head docking to be integral a mouthful frame by machine, and door body is rabbeted in groined type mouthful inframe is enclosed by knuckle joint, and mouth frame is connected by screw bolts with floor panel；Enclosed in groined type mouthful outer frame and arrange a plurality of diaphragm plate (4) parallel to each other along the longitudinal direction, the diaphragm plate (4) by rivet with floor panel while be connected.The mouth mount structure of the present invention, the form of angle box combination is added using segmentation peripheral frame and machine, the rigidity requirement of surrounding structure mouthful frame had both been met, processing technology is improved again, manufacturing cost is reduced.

Description

A kind of driving cabin discrepancy doorway mount structure and its design method

Technical field

The invention belongs to aircraft cockpit field, and in particular to a kind of driving cabin discrepancy doorway mount structure and its design side Method.

Background technology

In order to meet the usability requirement of aircraft, it is necessary to arrange opening on machine.Aircaft configuration opening form generally has three Kind：For the small opening at observation window, oil filler.It does not destroy the integrality of load-carrying construction, typically with frame form along opening Around use at backing plate reinforcement, opening and to be covered using quick-release screw lid；Medium-sized opening for carrying out system maintenance, it is destroyed The integrality of fuselage primary structure member, need to be using the load lid being connected with hatch frame primary structure member.This lid spiral shell Nail be fixed on along open circumferential on load-carrying member ensure mouthful frame and covering cut jointly (when being turned round) or by tension and compression (by it is curved when)； It is general subject to conditions, it is impossible to use same fuselage for the big opening of driving cabin access door, cargo compartment doors, undercarriage door etc. The load lid that force structure connects together to opening mouthful frame, it is necessary to carry out rigidity Strengthening Design.

Aircraft cockpit access door belongs to fuselage interior hatch door, is to connect driving cabin with cargo hold or the bridge in main cabin to lead to Road, will consider cooking apparatus integral hoisting requirement, to consider the opening ways of hatch door, it is also contemplated that the mechanism of opening door operation is gentle Spring requirement.Usual opening size causes the weakening and interruption of the main force transferring structure part in region than larger, is open simultaneously The local stress concentration in open area is also resulted in, very big influence is brought to the overall power transmission of housing construction and rigidity.Come in and go out doorway Frame is typically using overall mouth frame or combination box form.Overall mouth frame rigidity property is good, is conducive to carrying, but difficulty of processing is big, Economy is bad.

The content of the invention

It is an object of the invention to provide a kind of driving cabin discrepancy doorway mount structure and its design method, overcome or alleviated by existing There is at least one drawbacks described above of technology.

The purpose of the present invention is achieved through the following technical solutions：A kind of driving cabin discrepancy doorway mount structure, is arranged on floor At requirement aperture position on panel, including mouth frame, machine add angle box joint, diaphragm plate；The mouth frame is segmented peripheral frame, including Section is in I-shaped longitudinally reinforced beam and horizontal buttress brace；The segmented peripheral frame is arranged in door body periphery in groined type, respectively encloses Angle splice grafting head docking is added to be integral a mouthful frame by machine between frame, door body is rabbeted by knuckle joint encloses in groined type mouthful inframe Interior, mouth frame is connected by screw bolts with floor panel；Enclosed in groined type mouthful outer frame and arrange a plurality of horizontal stroke parallel to each other along the longitudinal direction Dividing plate, the diaphragm plate is connected by rivet with floor panel simultaneously.

Preferably, the knuckle joint is installed using multiple bolts being arranged side by side.

Preferably, the edge strip in the mouth frame is connected with extension using double bolt with the floor panel, its In, the bolt connected between mouth architrave bar and floor panel is high locked bolts.

Preferably, the docking of the mouth frame includes the connection of web and edge strip, and mouth frame joint formation cross corner connects Connect, mouth frame web is connected back-to-back by the reinforcement and trihedral angle box and L-shaped cornual plate of itself, wherein mouth frame web and cornual plate, Angle box is connected using double high locked bolts；Edge strip is attached by cross cornual plate, and connector is double high locked bolts.

Preferably, the diaphragm plate uses single rivet interlacement with the floor panel.

Preferably, longeron at one is set between mouth outer frame described in groined type encloses longitudinally reinforced beam described in two.

A kind of design method of driving cabin discrepancy doorway mount structure, comprises the following steps,

Step one：Arrangement is put in groined type at floor panel aperture position horizontal buttress brace and longitudinally reinforced beam；

Step 2：Docking between groined type mouthful each buttress brace of frame；

Step 3：Calculate horizontal buttress brace and longitudinally reinforced beam section size；

Step 4：Door body is connected with mouth frame buttress brace by knuckle joint；

Step 5：Floor panel is connected with mouth architrave bar by double high locked bolts；

Step 6：The connection of mouth frame extension；

Step 7：The connection of diaphragm plate.

Preferably, in step 2, the docking of mouth frame includes the connection of web and inner edge, mouth frame joint formation cross corner Connection, web is connected back-to-back by the reinforcement and trihedral angle box and L-shaped cornual plate of itself, and mouth frame web connects with cornual plate, angle box Connect using double high locked bolts, be connected on web, inner edge is attached by cross cornual plate, connector is double high lock spiral shell Bolt；

Double bolt bears shear-type load on mouth frame, and the high h of frame web takes direct stress σ and shear stress τ couplings on mouthful frame web Most serious situation calculate bolt on work shearing

Bolt destruction shearing is [P_s], then bolt shearing margin of safety is

The destruction extrusion load of bolt hole is

[P_br]=d₀×δ×k_br×σ_b

Wherein d₀For the diameter of bolt used, δ is thickness of interlayer, k_brFor extrusion coefficient, the thickness that δ is trihedral angle box is taken, is squeezed Press coefficient k_br=1.8, then

[P_br]=d₀×δ×k_br×σ_b

The extruding force that works P_brEqual to the work shearing on bolt, then the extruding margin of safety of bolt hole is

The double bolt connected between mouthful frame web bears the compound action of pulling force and shearing, take on connection web it is maximum just Nargin is cut in the drawing that maximum axial stress σ ' on stress σ and maximum shear stress τ and outer rim calculates bolt；

The then working pulling force of single bolt

The work shearing of single bolt

Bolt destruction pulling force [P_t], one side destruction shearing is [P_s], then the drawing of bolt cuts margin of safety and is

Bolt connection on mouth inframe edge is calculated by the shear strength of bolt and the crushing strength of bolt hole, and the wide b in inner edge is thick δ is spent, takes the maximum axial stress σ on mouthful inframe edge to calculate the work shearing on bolt

Bolt destruction shearing is [P_s], then bolt shearing margin of safety is

The destruction extrusion load of bolt hole is

[P_br]=d₀×δ×k_br×σ_b

Wherein d₀For the diameter of bolt used, δ is thickness of interlayer, k_brFor extrusion coefficient, the thickness that δ is cross cornual plate is taken, is squeezed Press coefficient k_br=1.8, then

[P_br]=d₀×δ×k_br×σ_b

The extruding force that works P_brEqual to the work shearing on bolt, then the extruding margin of safety of bolt hole is

In step 4, knuckle joint is multiple bolts side by side, and the destruction pulling force of bolt is [P_t], one side destruction shearing is [P_s], knuckle joint obtains maximum functional pulling force P under airtight operating mode_t, maximum functional shearing P_s, then connecting bolt stretching peace Nargin is entirely

The shearing margin of safety of bolt is

The extruding breaking load of bolt hole is

[P_br]=d₀×δ×k_br×σ_b

Wherein d₀For the diameter of bolt, δ is thickness of interlayer, k_brFor extrusion coefficient, take δ for mouth frame and strengthen backing plate thickness it With i.e. δ, material strength limit σ_b, extrusion coefficient k_br=1.8, then

[P_br]=d₀×δ×k_br×σ_b

The extruding force that works P_brEqual to the work shearing on bolt, then the extruding margin of safety of bolt hole is

In step 5, the bonding strength of bolt is calculated by bolt shear strength and bolt hole crushing strength, takes junction face The most serious situation of direct stress σ and shear stress the τ coupling of plate calculates bolt connection intensity,

Panel nature grid wide b, the double common n of bolt, then the shearing born on single bolt is

Bolt one side destruction shearing is [P_s], then bolt shearing margin of safety is

The extruding breaking load of bolt hole is

[P_br]=d₀×δ×k_br×σ_b

Wherein d₀For the diameter of bolt, δ is thickness of interlayer, k_brFor extrusion coefficient, take δ for covering and strengthen the thickness of backing plate, Extrusion coefficient k_br=1.8, then

[P_br]=d₀×δ×k_br×σ_b

The extruding force that works P_brSheared equal to the work on bolt, then the extruding margin of safety of bolt hole

In step 6, mouth frame extension uses double bolt connection, and pitch of bolts is l, takes the maximum of junction panel to cut Flow the work shearing on difference q calculating bolts

Bolt destruction shearing is [P_s], then bolt shearing margin of safety is

The extruding breaking load of bolt hole is

[P_br]=d₀×δ×k_br×σ_b

Wherein d₀For the diameter of bolt, δ is thickness of interlayer, k_brFor extrusion coefficient, take δ for covering and strengthen the thickness of backing plate, Extrusion coefficient k_br=1.8, then

[P_br]=d₀×δ×k_br×σ_b

The extruding force that works P_brSheared equal to the work on bolt, then the extruding margin of safety of bolt hole

In step 7, diaphragm plate uses single rivet interlacement with panel, takes the maximum shearing flow difference q in panel junction to calculate rivet The intensity of connection, junction thickness δ, maximum spacing l, then the work on rivet, which is sheared, is

P_s=ql

Rivet destruction shearing is [P_s], then the shearing margin of safety of rivet

The work that the work extruding force of nail is equal to rivet is sheared, the destruction extruding force [P of rivet hole_br], nail extruding peace Full nargin：

The beneficial effect of a kind of driving cabin discrepancy doorway mount structure provided by the present invention and its design method is, uses Segmentation peripheral frame and machine add the form of angle box combination, both met the rigidity requirement of surrounding structure mouthful frame, processing technology is improved again Property, reduce manufacturing cost.

Brief description of the drawings

Fig. 1 is the structural representation of driving cabin access door mouth structure of the present invention；

Fig. 2 is groined type buttress brace scheme of installation in driving cabin access door mouth structure of the present invention；

Fig. 3 is buttress brace stand under load rough schematic view in driving cabin access door mouth structure of the present invention；

Fig. 4 is reinforcement beam stress and deformation schematic diagram in driving cabin access door mouth structure of the present invention；

Fig. 5 is buttress brace schematic cross-section in driving cabin access door mouth structure of the present invention；

Fig. 6 is the scheme of installation of driving cabin access door mouth structure of the present invention.

Reference：

1- mouthfuls of frames, 2- machines add angle box joint, 3- longerons, 4- diaphragm plates.

Embodiment

To make the purpose, technical scheme and advantage of the invention implemented clearer, below in conjunction with the embodiment of the present invention Accompanying drawing, the technical scheme in the embodiment of the present invention is further described in more detail.In the accompanying drawings, identical from beginning to end or class As label represent same or similar element or the element with same or like function.Described embodiment is the present invention A part of embodiment, rather than whole embodiments.The embodiments described below with reference to the accompanying drawings are exemplary, it is intended to uses It is of the invention in explaining, and be not considered as limiting the invention.Based on the embodiment in the present invention, ordinary skill people The every other embodiment that member is obtained under the premise of creative work is not made, belongs to the scope of protection of the invention.

The driving cabin discrepancy doorway mount structure and its design method of the present invention are done further specifically below in conjunction with the accompanying drawings It is bright.

As shown in figures 1 to 6, a kind of driving cabin discrepancy doorway mount structure, is arranged on the requirement opening position on floor panel Place is put, including mouth frame 1, machine add angle box joint 2, diaphragm plate 4.Mouth frame 1 is segmented peripheral frame, including section is in I-shaped longitudinal direction Buttress brace and horizontal buttress brace.The segmented peripheral frame is arranged between door body periphery, each peripheral frame in groined type adds angle to close by machine Joint docking is integral a mouthful frame, and the docking of mouth frame includes the connection of web and edge strip, and mouth frame joint formation cross corner connects Connect, mouth frame web is connected back-to-back by the reinforcement and trihedral angle box and L-shaped cornual plate of itself, wherein mouth frame web and cornual plate, Angle box is connected using double high locked bolts, and edge strip is attached by cross cornual plate, and connector is double high locked bolts.Door body is led to Knuckle joint interlocking is crossed in groined type mouthful inframe is enclosed, knuckle joint is installed using multiple bolts being arranged side by side.Mouth frame and ground Plate face plate is connected by screw bolts, and wherein the edge strip in mouth frame is connected with extension using double bolt with floor panel, mouth frame The bolt connected between edge strip and floor panel is high locked bolts.Enclosed in groined type mouthful outer frame and arrange a plurality of put down each other along the longitudinal direction Capable diaphragm plate 4, the diaphragm plate 4 is connected by single rivet with floor panel simultaneously, and enclosing two longitudinal directions in groined type mouthful outer frame adds Longeron 3 at one are also set up between brutal.

The design method of driving cabin discrepancy doorway mount structure of the present invention is described below, comprises the following steps,

(1) the horizontal buttress brace and longitudinally reinforced beam that arrangement is put in groined type at floor panel aperture position.(2) well Docking between the font mouthful each buttress brace of frame 1.(3) horizontal buttress brace and longitudinally reinforced beam section size are calculated.(4) door body and mouth The buttress brace of frame 1 is connected by knuckle joint.(5) floor panel is connected with the edge strip of mouth frame 1 by double high locked bolts.(6) mouth frame 1 Extension is connected.(7) connection of diaphragm plate 4.

Each step is described in detail below.

Step one：Arrangement is put in groined type at floor panel aperture position horizontal buttress brace and longitudinally reinforced beam, such as Shown in Fig. 2.

Step 2：Docking between the groined type mouthful each buttress brace of frame 1.

Mouth frame docking includes the connection of web and inner edge, and mouth frame joint formation cross corner connection, web passes through itself Reinforcement and trihedral angle box and L-shaped cornual plate connect back-to-back, mouth frame web is connected with cornual plate, angle box using double high lock spiral shell Bolt, is connected on web, and inner edge is attached by cross cornual plate, and connector is double high locked bolts；

Double bolt bears shear-type load on mouth frame, and the high h of frame web takes direct stress σ and shear stress τ couplings on mouthful frame web Most serious situation calculate bolt on work shearing

Bolt destruction shearing is [P_s], then bolt shearing margin of safety is

The destruction extrusion load of bolt hole is

[P_br]=d₀×δ×k_br×σ_b

Wherein d₀For the diameter of bolt used, δ is thickness of interlayer, k_brFor extrusion coefficient, the thickness that δ is trihedral angle box is taken, is squeezed Press coefficient k_br=1.8, then

[P_br]=d₀×δ×k_br×σ_b

The extruding force that works P_brEqual to the work shearing on bolt, then the extruding margin of safety of bolt hole is

The double bolt connected between mouthful frame web bears the compound action of pulling force and shearing, take on connection web it is maximum just Nargin is cut in the drawing that maximum axial stress σ ' on stress σ and maximum shear stress τ and outer rim calculates bolt；

The then working pulling force of single bolt

The work shearing of single bolt

Bolt destruction pulling force [P_t], one side destruction shearing is [P_s], then the drawing of bolt cuts margin of safety and is

Bolt connection on mouth inframe edge is calculated by the shear strength of bolt and the crushing strength of bolt hole, and the wide b in inner edge is thick δ is spent, takes the maximum axial stress σ on mouthful inframe edge to calculate the work shearing on bolt

Bolt destruction shearing is [P_s], then bolt shearing margin of safety is

The destruction extrusion load of bolt hole is

[P_br]=d₀×δ×k_br×σ_b

Wherein d₀For the diameter of bolt used, δ is thickness of interlayer, k_brFor extrusion coefficient, the thickness that δ is cross cornual plate is taken, is squeezed Press coefficient k_br=1.8, then

[P_br]=d₀×δ×k_br×σ_b

The extruding force that works P_brEqual to the work shearing on bolt, then the extruding margin of safety of bolt hole is

Step 3：Calculate horizontal buttress brace and longitudinally reinforced beam section size.

According to power transmission feature, buttress brace can be reduced to bear uniform load, double fulcrum beam models of two fixed ends, such as Fig. 3 Shown, stress sketch are as shown in Figure 4.

According to engineering beam theory, strengthen maximum shear and moment of flexure on beam length l, the uniform load q that buttress brace is born, longeron For：

Maximum stress in bend is on longeron：

I-shaped reinforcement beam section is determined by calculating, its section is as shown in Figure 5.

Step 4：Door body is connected with the buttress brace of mouth frame 1 by knuckle joint.

Driving cabin access door is connected on doorframe by knuckle joint, and connector is multiple bolts side by side.Bolt it is broken Bad pulling force is [P_t], one side destruction shearing is [P_s], knuckle joint obtains maximum functional pulling force P under airtight operating mode_t, maximum work Make shearing P_s, then the stretching margin of safety of connecting bolt be

The shearing margin of safety of bolt is

The extruding breaking load of bolt hole is

[P_br]=d₀×δ×k_br×σ_b

Wherein d₀For the diameter of bolt, δ is thickness of interlayer, k_brFor extrusion coefficient,

Take δ for mouth frame and strengthen the thickness sum of backing plate, i.e. δ, material strength limit σ_b, extrusion coefficient k_br=1.8, then

[P_br]=d₀×δ×k_br×σ_b

The extruding force that works P_brEqual to the work shearing on bolt, then the extruding margin of safety of bolt hole is

Step 5：Floor panel is connected with the edge strip of mouth frame 1 by double high locked bolts.

Floor panel and the double bolt connection of mouth architrave strip adoption, are high locked bolts at mouth frame.The bonding strength of bolt Calculated by bolt shear strength and bolt hole crushing strength, the most serious for taking the direct stress σ and shear stress τ of junction panel to couple Situation calculates bolt connection intensity,

Panel nature grid wide b, the double common n of bolt, then the shearing born on single bolt is

Bolt one side destruction shearing is [P_s], then bolt shearing margin of safety is

The extruding breaking load of bolt hole is

[P_br]=d₀×δ×k_br×σ_b

Wherein d₀For the diameter of bolt, δ is thickness of interlayer, k_brFor extrusion coefficient, take δ for covering and strengthen the thickness of backing plate, Extrusion coefficient k_br=1.8, then

[P_br]=d₀×δ×k_br×σ_b

The extruding force that works P_brSheared equal to the work on bolt, then the extruding margin of safety of bolt hole

Step 6：The connection of mouth frame 1 extension.

Mouth frame extension uses double bolt connection, and pitch of bolts is l, takes the maximum shearing flow difference q of junction panel to calculate Work shearing on bolt

Bolt destruction shearing is [P_s], then bolt shearing margin of safety is

The extruding breaking load of bolt hole is

[P_br]=d₀×δ×k_br×σ_b

Wherein d₀For the diameter of bolt, δ is thickness of interlayer, k_brFor extrusion coefficient, take δ for covering and strengthen the thickness of backing plate, Extrusion coefficient k_br=1.8, then

[P_br]=d₀×δ×k_br×σ_b

The extruding force that works P_brSheared equal to the work on bolt, then the extruding margin of safety of bolt hole

Step 7：The connection of diaphragm plate 4.

In step 7, diaphragm plate uses single rivet interlacement with panel, takes the maximum shearing flow difference q in panel junction to calculate rivet The intensity of connection, junction thickness δ, maximum spacing l, then the work on rivet, which is sheared, is

P_s=ql

Rivet destruction shearing is [P_s], then the shearing margin of safety of rivet

The work that the work extruding force of nail is equal to rivet is sheared, the destruction extruding force [P of rivet hole_br], nail extruding peace Full nargin：

The foregoing is only a specific embodiment of the invention, but protection scope of the present invention is not limited thereto, any Those familiar with the art the invention discloses technical scope in, the change or replacement that can be readily occurred in, all should It is included within the scope of the present invention.Therefore, protection scope of the present invention should using the scope of the claims as It is accurate.

Claims (8)

1. The doorway mount structure 1. a kind of driving cabin comes in and goes out, is arranged at the requirement aperture position on floor panel, it is characterised in that bag Include a mouthful frame (1), machine and add angle box joint (2), diaphragm plate (4)；The mouth frame (1) is segmented peripheral frame, including section is in I-shaped Longitudinally reinforced beam and horizontal buttress brace；The segmented peripheral frame is arranged between door body periphery, each peripheral frame in groined type passes through machine Plus splice grafting head docking in angle is integral a mouthful frame, door body is rabbeted in groined type mouthful inframe is enclosed by knuckle joint, mouth frame and floor Panel is connected by screw bolts；Enclosed in groined type mouthful outer frame and arrange a plurality of diaphragm plate (4) parallel to each other, the tabula along the longitudinal direction Plate (4) by rivet with floor panel while be connected.
2. The doorway mount structure 2. driving cabin according to claim 1 comes in and goes out, it is characterised in that the knuckle joint is using multiple The bolt being arranged side by side is installed.
3. The doorway mount structure 3. driving cabin according to claim 2 comes in and goes out, it is characterised in that the edge strip in the mouth frame is with prolonging Duan Jun is stretched to be connected with the floor panel using double bolt, wherein, the bolt connected between mouth architrave bar and floor panel is height Lock bolt.
4. 4. according to the driving cabin discrepancy doorway mount structure described in claim 3, it is characterised in that the docking of the mouth frame includes web With the connection of edge strip, the corner connection of mouth frame joint formation cross, reinforcement and trihedral angle box and L that mouth frame web passes through itself Shape cornual plate is connected back-to-back, and wherein mouth frame web is connected with cornual plate, angle box using double high locked bolts；Edge strip passes through cross cornual plate It is attached, connector is double high locked bolts.
5. 5. according to described in claim 4 driving cabin come in and go out doorway mount structure, it is characterised in that the diaphragm plate (4) with describedly Plate face plate uses single rivet interlacement.
6. 6. according to the driving cabin discrepancy doorway mount structure described in claim 1, it is characterised in that enclose two in mouth outer frame described in groined type Longeron at one (3) is set between the longitudinally reinforced beam.
7. The design method of doorway mount structure 7. a kind of driving cabin according to claim 5 comes in and goes out, it is characterised in that including such as Lower step,

   Step one：Arrangement is put in groined type at floor panel aperture position horizontal buttress brace and longitudinally reinforced beam；

   Step 2：Docking between groined type mouthful frame (1) each buttress brace；

   Step 3：Calculate horizontal buttress brace and longitudinally reinforced beam section size；

   Step 4：Door body is connected with mouth frame (1) buttress brace by knuckle joint；

   Step 5：Floor panel is connected with mouth frame (1) edge strip by double high locked bolts；

   Step 6：The connection of mouth frame (1) extension；

   Step 7：The connection of diaphragm plate (4).
8. 8. according to the driving cabin discrepancy doorway mount structure described in claim 7, it is characterised in that

   In step 2, the docking of mouth frame includes the connection of web and inner edge, and mouth frame joint formation cross corner connection, web passes through The reinforcement and trihedral angle box and L-shaped cornual plate of itself are connected back-to-back, and mouth frame web is connected with cornual plate, angle box using double high lock Bolt, is connected on web, and inner edge is attached by cross cornual plate, and connector is double high locked bolts；

   Double bolt bears shear-type load on mouth frame, and the high h of frame web takes direct stress σ and shear stress τ on mouthful frame web to couple most Serious conditions calculate the work shearing on bolt

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   Bolt destruction shearing is [P_s], then bolt shearing margin of safety is

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   The destruction extrusion load of bolt hole is

   [P_br]=d₀×δ×k_br×σ_b

   Wherein d₀For the diameter of bolt used, δ is thickness of interlayer, k_brFor extrusion coefficient, the thickness that δ is trihedral angle box, extruding system are taken Number k_br=1.8, then

   [P_br]=d₀×δ×k_br×σ_b

   The extruding force that works P_brEqual to the work shearing on bolt, then the extruding margin of safety of bolt hole is

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   The double bolt connected between mouth frame web bears the compound action of pulling force and shearing, takes maximum (normal) stress on connection web Nargin is cut in the drawing that maximum axial stress σ ' on σ and maximum shear stress τ and outer rim calculates bolt；

   The then working pulling force of single bolt

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   The work shearing of single bolt

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   Bolt destruction pulling force [P_t], one side destruction shearing is [P_s], then the drawing of bolt cuts margin of safety and is

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   Bolt connection on mouth inframe edge is calculated by the shear strength of bolt and the crushing strength of bolt hole, the wide b in inner edge, thickness δ, The maximum axial stress σ on mouthful inframe edge is taken to calculate the work shearing on bolt

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   Bolt destruction shearing is [P_s], then bolt shearing margin of safety is

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   The destruction extrusion load of bolt hole is

   [P_br]=d₀×δ×k_br×σ_b

   Wherein d₀For the diameter of bolt used, δ is thickness of interlayer, k_brFor extrusion coefficient, the thickness that δ is cross cornual plate, extruding system are taken Number k_br=1.8, then

   [P_br]=d₀×δ×k_br×σ_b

   The extruding force that works P_brEqual to the work shearing on bolt, then the extruding margin of safety of bolt hole is

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   In step 4, knuckle joint is multiple bolts side by side, and the destruction pulling force of bolt is [P_t], one side destruction shearing is [P_s], Knuckle joint obtains maximum functional pulling force P under airtight operating mode_t, maximum functional shearing P, then connecting bolt stretching margin of safety For

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   The shearing margin of safety of bolt is

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   The extruding breaking load of bolt hole is

   [P_br]=d₀×δ×k_br×σ_b

   Wherein d₀For the diameter of bolt, δ is thickness of interlayer, k_brFor extrusion coefficient,

   Take δ for mouth frame and strengthen the thickness sum of backing plate, i.e. δ, material strength limit σ_b, extrusion coefficient k_br=1.8, then

   [P_br]=d₀×δ×k_br×σ_b

   The extruding force that works P_brEqual to the work shearing on bolt, then the extruding margin of safety of bolt hole is

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   In step 5, the bonding strength of bolt is calculated by bolt shear strength and bolt hole crushing strength, takes junction panel The most serious situation of direct stress σ and shear stress τ couplings calculates bolt connection intensity,

   Panel nature grid wide b, the double common n of bolt, then the shearing born on single bolt is

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   Bolt one side destruction shearing is [P_s], then bolt shearing margin of safety is

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   The extruding breaking load of bolt hole is

   [P_br]=d₀×δ×k_br×σ_b

   Wherein d₀For the diameter of bolt, δ is thickness of interlayer, k_brFor extrusion coefficient, take δ for covering and strengthen the thickness of backing plate, extruding Coefficient k_br=1.8, then

   [P_br]=d₀×δ×k_br×σ_b

   The extruding force that works P_brSheared equal to the work on bolt, then the extruding margin of safety of bolt hole

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   In step 6, mouth frame extension uses double bolt connection, and pitch of bolts is l, takes the maximum shearing flow difference q of junction panel Calculate the work shearing on bolt

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   Bolt destruction shearing is [P_s], then bolt shearing margin of safety is

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   The extruding breaking load of bolt hole is

   [P_br]=d₀×δ×k_br×σ_b

   Wherein d₀For the diameter of bolt, δ is thickness of interlayer, k_brFor extrusion coefficient, take δ for covering and strengthen the thickness of backing plate, extruding Coefficient k_br=1.8, then

   [P_br]=d₀×δ×k_br×σ_b

   The extruding force that works P_brSheared equal to the work on bolt, then the extruding margin of safety of bolt hole

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   In step 7, diaphragm plate uses single rivet interlacement with panel, takes the maximum shearing flow difference q in panel junction to calculate rivet interlacement Intensity, junction thickness δ, maximum spacing l, then on rivet work shearing is

   P_s=ql

   Rivet destruction shearing is [P_s], then the shearing margin of safety of rivet

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   The work that the work extruding force of nail is equal to rivet is sheared, the destruction extruding force [P of rivet hole_br], nail extruding safety is abundant Degree：

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