A positioning tool for manufacturing a composite material fuselage wall panel

Abstract

The application discloses a positioning tool for manufacturing a composite material fuselage wall plate and belongs to the technical field of composite material manufacturing, which comprises a positioning support, a plurality of positioning mechanisms arranged along a stringer convex profile are installed on the positioning support, the positioning mechanism comprises a gas cylinder installed on the positioning support, a sleeve is installed at the output end of the gas cylinder, a connecting rod is slidably installed in the sleeve, a positioning block is installed on the connecting rod, a first spring is connected between the positioning block and the sleeve, a support is fixedly installed on the sleeve, two push rods respectively located on the two sides of the stringer convex profile are limitingly and slidably installed on the support, a first elastic member is installed between the push rod and the support, a positioning rod is elastically connected in the push rod, and an abutting block capable of abutting against the bottom side of the positioning block is installed on the positioning rod. The stringer is compressed by the positioning rod, so that the positioning stability of the stringer is ensured; and the abutting block is abutted against the bottom side of the positioning block, so that the acting force of the positioning block on the stringer convex profile is reduced.

Description

Technical Field

[0001] This invention belongs to the field of composite material manufacturing technology, and specifically relates to a positioning tool for manufacturing composite material fuselage panels. Background Technology

[0002] The largest structural unit in an aircraft fuselage is the panel (skin and stringers), which is also the most stressed structural component. Most of the fuselage load is transferred through the panel. As a longitudinal member of the fuselage structure, the stringer is mainly used to bear the axial force caused by fuselage bending in a stringer fuselage. In addition, the stringer supports the skin and increases the critical stress for compressive and shear instability of the skin. The accuracy of the relative position of the stringers greatly affects the overall structural performance of the fuselage panels. Therefore, the positioning device during the assembly of aircraft stringers affects the assembly quality and efficiency of the aircraft.

[0003] In the prior art, Chinese patent with publication number CN 115042456 B discloses a long stringer positioning fixture for manufacturing composite material fuselage panels. When the long stringer is pressed by the profile positioning block, the profile positioning block applies a force to the top of the long stringer. Although this pressing method achieves the pressing of the Ω-shaped long stringer, the middle of the Ω-shaped long stringer is hollow, which can easily cause excessive pressing force, resulting in the compression instability and deformation of the protruding profile of the long stringer.

[0004] Therefore, a positioning fixture for manufacturing composite material fuselage panels is needed to solve the above problems. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a positioning fixture for manufacturing composite material fuselage panels, which solves the problem that when the clamping method in the prior art clamps the Ω-shaped stringer, the middle part of the Ω-shaped stringer is hollow, which easily causes excessive clamping force, resulting in compression instability and deformation of the stringer's protruding surface.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] This invention provides a positioning fixture for manufacturing composite material fuselage panels, comprising: a positioning bracket arranged along a stringer; a plurality of positioning mechanisms arranged along the protruding surfaces of the stringer mounted on the positioning bracket; each positioning mechanism including a cylinder mounted on the positioning bracket; a sleeve mounted on the output end of the cylinder; a connecting rod capable of limited sliding along the axial direction of the sleeve mounted inside the sleeve; a positioning block cooperating with the protruding surfaces of the stringer fixedly connected to the connecting rod near the end of the stringer; a first spring sleeved on the outer periphery of the connecting rod connecting the positioning block and the sleeve; and a fixed fixture on the sleeve. The device is equipped with a support, on which two push rods are slidably mounted at the upper limit, located on both sides of the protruding surface of the stringer. A first elastic element is installed between the push rods and the support. The push rods can slide along the axis of the support to limit the stretching or compression of the first elastic element. A positioning rod for pressing the two sides of the protruding surface of the stringer is slidably mounted inside the push rod. A second elastic element is installed between the positioning rod and the push rod. The positioning rod can slide along the axis of the push rod to limit the stretching or compression of the second elastic element. An abutment block that can abut against the bottom side of the positioning block is installed at the end of the positioning rod extending out of the push rod.

[0008] Furthermore, the sleeve is provided with a first limiting hole in the radial direction, and the connecting rod is equipped with a first limiting rod that limits sliding within the first limiting hole.

[0009] Furthermore, the push rod is provided with a second limiting hole that extends laterally through the push rod, and the positioning rod is provided with a limiting plate that is slidably installed in the second limiting hole. A second elastic element is connected between the limiting plate and the top wall of the second limiting hole.

[0010] Furthermore, the sleeve includes a first sleeve connected to the cylinder output end, a second sleeve that can slide and limit along the extension direction of the support is installed inside the first sleeve, the first limiting hole is provided on the second sleeve, the first sleeve is provided with a third limiting hole that penetrates the first sleeve in the radial direction, the axis of the third limiting hole is perpendicular to the axis of the first limiting hole, and the positioning block is provided with inclined portions on both sides that are inclined away from the protruding surface of the stringer.

[0011] Furthermore, the positioning rod extends to the push rod end and is provided with a sliding groove. A sliding block that can slide along the extension direction of the push rod is installed in the sliding groove. A second spring is connected between the sliding block and the bottom end of the positioning rod. The sliding block is provided with a cavity with an opening close to the protruding surface of the stringer. The abutting block is slidably installed in the cavity. A third spring is installed between the abutting block and the first side wall of the cavity. The inclined part is provided with a notch that penetrates the inclined part along the Z-axis direction. The abutting block can slide along the notch to the bottom side of the inclined part. The elastic force of the third spring causes the abutting block to be misaligned with the notch so that the abutting block abuts against the bottom side of the inclined part. When the abutting block abuts against the bottom side of the inclined part, the sliding block abuts against the bottom wall of the sliding groove. A second elastic element is provided between the limiting plate and the top wall of the second limiting hole. A gap is provided between the limiting plate and the bottom wall of the second limiting hole.

[0012] Furthermore, an adjusting cylinder is installed on the second side wall of the cavity, and the output end of the adjusting cylinder is located close to the abutment block.

[0013] Furthermore, a reinforcing plate is installed at the bottom of the positioning rod, and the reinforcing plate is connected to an elastic element by a fourth spring. The fourth spring array is arranged between the reinforcing plate and the elastic pad.

[0014] The beneficial effects of this invention are as follows:

[0015] The present invention uses a positioning rod to press the stringer, ensuring the positioning stability of the stringer; and uses an abutment block to abut against the lower side of the positioning block, so that the positioning block can limit the position of the stringer and reduce the force of the positioning block on the protruding surface of the stringer.

[0016] Other advantages, objectives, and features of the invention will be set forth in the following description and will be apparent to those skilled in the art in some respects, or may be learned by practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0017] To make the objectives, technical solutions, and beneficial effects of this invention clearer, the following figures are provided for illustration:

[0018] Figure 1 This is a schematic diagram of the positioning mechanism according to an embodiment of the present invention;

[0019] Figure 2 This is a cross-sectional view of the positioning mechanism according to an embodiment of the present invention;

[0020] Figure 3 Embodiments of the present invention Figure 2 A magnified view of part A in the middle;

[0021] Figure 4 This is a schematic diagram of the slide structure according to an embodiment of the present invention.

[0022] The following are the markings in the attached diagram: stringer 1, sleeve 2, first limiting hole 201, first sleeve 202, second sleeve 203, third limiting hole 204, connecting rod 3, first limiting rod 301, positioning block 4, inclined part 401, notch 402, first spring 5, support 6, push rod 7, second limiting hole 701, first elastic element 8, positioning rod 9, slide groove 901, reinforcing plate 902, fourth spring 903, elastic pad 904, limiting plate 905, second elastic element 10, abutment block 11, slide seat 12, second spring 13, third spring 14, adjusting cylinder 15. Detailed Implementation

[0023] like Figures 1-4 As shown, the present invention provides a positioning fixture for manufacturing composite material fuselage panels, comprising: a positioning bracket arranged along a stringer 1, wherein a plurality of positioning mechanisms are mounted on the positioning bracket along the protruding surface of the stringer 1, each positioning mechanism including a cylinder mounted on the positioning bracket, a sleeve 2 mounted on the output end of the cylinder, the cylinder being used to output linear motion to move the sleeve 2 toward or away from the stringer 1, a connecting rod 3 capable of limited sliding along the axial direction of the sleeve 2 being installed inside the sleeve 2, a positioning block 4 cooperating with the protruding surface of the stringer 1 being fixedly connected to the end of the connecting rod 3 near the stringer 1, and a first spring 5 sleeved on the outer periphery of the connecting rod 3 being connected between the positioning block 4 and the sleeve 2.

[0024] The sleeve 2 is provided with a first limiting hole 201 penetrating the sleeve 2 in the radial direction, and the connecting rod 3 is equipped with a first limiting rod 301 that limits sliding within the first limiting hole 201.

[0025] A support 6 is fixedly installed on the sleeve 2. Two push rods 7 are symmetrically arranged about the connecting rod 3 and slidably installed on the support 6. A first elastic element 8 is installed between the push rod 7 and the support 6. The first elastic element 8 includes, but is not limited to, a spring. A positioning rod 9 for pressing the two sides of the protruding surface of the stringer 1 is slidably installed inside the push rod 7. A second elastic element 10 is installed between the positioning rod 9 and the push rod 7. The second elastic element 10 includes, but is not limited to, a spring.

[0026] The push rod 7 is provided with a second limiting hole 701 that extends laterally through the push rod 7, and the positioning rod 9 is provided with a limiting plate 905 that is slidably installed in the second limiting hole 701.

[0027] The end of the positioning rod 9 extending from the push rod 7 is fitted with an abutment block 11 that can abut against the bottom side of the positioning block 4.

[0028] In this scheme, the arrangement of the positioning bracket and positioning mechanism is adapted to the actual arrangement of the stringer 1. The vertical direction of the raised surface of the stringer 1 is defined as the Z-axis, the extension direction of the raised surface is defined as the X-axis, and the extension direction of the support 6 is defined as the Y-axis. When the stringer 1 is positioned by this positioning mechanism, the cylinder is activated to drive the sleeve 2 to move closer to the stringer 1. At this time, the sleeve 2, connecting rod 3, positioning block 4, support 6, push rod 7, and positioning rod 9 all move synchronously. When the positioning block 4 moves to fit with the raised surface of the stringer 1, it is set to the fitting state. In the fitting state, the bottom end of the push rod 7 fits with the extension arms on both sides of the raised surface of the stringer 1. The cylinder continues to drive the sleeve 2 to move closer to the stringer 1 to enter the pressing state. In the pressing state, the sleeve 2 continues to move to make the first spring When spring 5 is compressed, there is a relative displacement between sleeve 2 and connecting rod 3. As sleeve 2 continues to move, push rod 7 and positioning rod 9 move downward. Positioning rod 9 is in contact with the extension arms on both sides of the convex surface of stringer 1, thereby compressing the second elastic element 10 and the first elastic element 8 to increase the clamping force of positioning rod 9 on stringer 1. As sleeve 2 continues to move downward, the abutment block 11 abuts against the bottom side of positioning block 4. Under the clamping state, the force applied to positioning block 4 by sleeve 2 continues to move downward acts on abutment block 11, thereby reducing the force of positioning block 4 on convex surface of stringer 1. That is, positioning block 4 and convex surface of stringer 1 are in contact to limit stringer 1. Positioning rod 9 and extension arms on both sides of convex surface of stringer 1 are in a clamping state to ensure the positioning stability of stringer 1.

[0029] In one embodiment of the present invention, the sleeve 2 includes a first sleeve 202 connected to the cylinder output end, a second sleeve 203 that can slide and limit along the extension direction of the support 6 is installed in the first sleeve 202, the first limiting hole 201 is provided on the second sleeve 203, the first sleeve 202 is provided with a third limiting hole 204 through the first sleeve 202 in the radial direction, the axis of the third limiting hole 204 is perpendicular to the axis of the first limiting hole 201, and the positioning block 4 is provided with inclined portions 401 on both sides that are inclined away from the protruding surface of the stringer 1.

[0030] In this scheme, if the positioning block 4 is misaligned with the stringer 1 due to installation error, when the drive cylinder moves the sleeve 2 downward, the inclined part 401 slides along the raised surface of the stringer 1 to achieve fine adjustment and alignment of the positioning block 4. At this time, the second sleeve 203 slides in the third limiting hole 204. Through the design of the above structure, the positioning block 4 can be aligned to ensure the fit between the positioning block 4 and the raised surface of the stringer 1, and avoid damage to the stringer 1 caused by misalignment due to installation error during clamping.

[0031] In one embodiment of the present invention, the positioning rod 9 extends out of the push rod 7 and is slidably mounted on a slide block 12. A second spring 13 is connected between the slide block 12 and the bottom end of the positioning rod 9. The slide block 12 has a cavity with an opening close to the protruding surface of the stringer 1. The abutting block 11 is slidably mounted in the cavity. A third spring 14 is installed between the abutting block 11 and the first side wall of the cavity. An adjusting cylinder 15 is installed on the second side wall of the cavity. The inclined portion 401 has a notch 402 that penetrates the inclined portion 401 along the Z-axis direction. The abutting block 11 can slide along the notch 402 to the bottom side of the inclined portion 401. The elastic force of the third spring 14 causes the abutting block 11 to be misaligned with the notch 402 so that the abutting block 11 abuts against the bottom side of the inclined portion 401. A second elastic element 10 is provided between the limiting plate 905 and the top wall of the second limiting hole 701. A gap is provided between the limiting plate 905 and the bottom wall of the second limiting hole 701.

[0032] In this design, the positioning rod 9 has a groove 901, and the slide block 12 is slidably installed in the groove 901. Before the pressing state, under the action of the second spring 13, there is a gap between the slide block 12 and the bottom wall of the groove 901, and there is also a gap between the limiting plate 905 and the bottom wall of the second limiting hole 701. In the pressing state, the support 6 moves down, causing the push rod 7 to move down, thereby squeezing the slide block 12. At this time, the second spring 13 is compressed, and the slide block 12... Slide along the notch 402 to the lower side of the inclined part 401. At this time, the slide block 12 loses the limit of the notch 402. Under the action of the third spring 14, the slide block 12 is misaligned with the notch 402. At this time, the slide block 12 abuts against the bottom wall of the slide groove 901, so that the abutting block 11 abuts against the lower side of the inclined part 401. When the sleeve 2 returns to its original position, the adjusting cylinder 15 drives the abutting block 11 to return to its original position to cooperate with the notch 402. Under the action of the second spring 13, the abutting block 11 returns to its original position inside the notch 402.

[0033] This solution, through the design of the above structure, can prevent the positioning block 4 from separating from the abutment block 11 during the positioning of the curved stringer, ensuring the abutment stability of the abutment block 11 against the positioning block 4. Furthermore, the second spring 13 increases the abutment force of the abutment block 11 against the positioning block 4. Moreover, by sliding the abutment block 11 along the notch 402 to the underside of the inclined part 401 for abutment, the travel range of the push rod 7 can be increased, and the clamping force of the positioning rod 9 on the stringer 1 can be increased when the positioning block 4 and the protruding surface of the stringer 1 are in contact. It can also ensure that the positioning block 4 and the protruding surface of the stringer 1 are in contact, avoiding the situation where there is a gap due to incomplete contact between the positioning block 4 and the stringer 1.

[0034] In one embodiment of the present invention, a reinforcing plate 902 is installed at the bottom end of the positioning rod 9, and the reinforcing plate 902 is connected to an elastic pad 904 by a fourth spring 903, and the fourth spring 903 is arranged in an array between the reinforcing plate 902 and the elastic pad 904.

[0035] In this scheme, the pressing area of ​​the positioning rod 9 on the stringer 1 is increased by setting a reinforcing plate 902 and an elastic pad 904 to ensure pressing stability; by setting a fourth spring 903 and an elastic pad 904, the elastic pad 904 can fit the surface of the stringer 1 during pressing to adapt to the curved stringer.

[0036] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made to it in form and detail without departing from the scope defined by the claims of the present invention.

Claims

1. A positioning fixture for manufacturing a composite material fuselage panel, comprising: The positioning support is arranged along the long beam, and a plurality of positioning mechanisms are arranged along the convex profile of the long beam, characterized in that the positioning mechanism comprises a cylinder mounted on the positioning support, a sleeve is mounted at the output end of the cylinder, a connecting rod capable of sliding along the axial direction of the sleeve is mounted in the sleeve, a positioning block matched with the convex profile of the long beam is fixedly connected to the connecting rod close to the end of the long beam, a first spring is arranged between the positioning block and the sleeve and sleeved on the outer periphery of the connecting rod, a support is fixedly mounted on the sleeve, two push rods respectively located on both sides of the convex profile of the long beam are limitingly and slidably mounted on the support, a first elastic member is arranged between the push rod and the support, the push rod can limitingly slide along the axial direction of the support to stretch or compress the first elastic member, a positioning rod for pressing both sides of the convex profile of the long beam is limitingly and slidably mounted in the push rod, a second elastic member is arranged between the positioning rod and the push rod, the positioning rod can limitingly slide along the axial direction of the push rod to stretch or compress the second elastic member, an abutting block capable of abutting against the bottom side of the positioning block is mounted on the end of the positioning rod extending out of the push rod.

2. The positioning fixture for manufacturing composite material fuselage wall panels according to claim 1, characterized in that: A first limiting hole penetrating through the sleeve is arranged in the radial direction of the sleeve, and a first limiting rod is mounted on the connecting rod and limitingly slides in the first limiting hole.

3. The positioning fixture for manufacturing composite material fuselage wall panels according to claim 2, characterized in that: A second limiting hole penetrating through the push rod is arranged on the push rod, a limiting plate limitingly and slidably mounted in the second limiting hole is arranged on the positioning rod, and a second elastic member is arranged between the limiting plate and the top wall of the second limiting hole. The sleeve comprises a first sleeve connected with the output end of the cylinder, a second sleeve capable of limitingly and slidably extending along the support is mounted in the first sleeve, the first limiting hole is arranged on the second sleeve, a third limiting hole penetrating through the first sleeve is arranged in the radial direction of the first sleeve, the axis of the third limiting hole is arranged perpendicularly to the axis of the first limiting hole, and an inclined portion inclined away from the convex profile of the long beam is arranged on both sides of the positioning block. A sliding groove is arranged on the end of the positioning rod extending out of the push rod, a sliding seat capable of sliding along the extending direction of the push rod is mounted in the sliding groove, a second spring is arranged between the sliding seat and the bottom end of the positioning rod, an open cavity with the opening close to the convex profile of the long beam is arranged in the sliding seat, the abutting block is limitingly mounted in the cavity, a third spring is arranged between the abutting block and the first side wall of the cavity, a notch penetrating through the inclined portion along the Z-axis direction is arranged on the inclined portion, the abutting block can slide along the notch to the bottom side of the inclined portion and be dislocated from the notch by the elastic force of the third spring to abut against the bottom side of the inclined portion, when the abutting block abuts against the bottom side of the inclined portion, the sliding seat abuts against the bottom wall of the sliding groove, a second elastic member is arranged between the limiting plate and the top wall of the second limiting hole, and a gap is arranged between the limiting plate and the bottom wall of the second limiting hole. An adjusting cylinder is mounted on the second side wall of the cavity, and the output end of the adjusting cylinder is arranged close to the abutting block. A reinforcing plate is mounted at the bottom end of the positioning rod, the reinforcing plate is connected with an elastic member through a fourth spring, and the fourth spring is arranged between the reinforcing plate and the elastic pad.

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