Undercarriage drop test protection device and drop test bench

Abstract

The utility model provides an undercarriage drop test protection device and a drop test bench. The landing gear drop test protection device comprises a connecting block, an elastic telescopic piece and a check block, one end of the check block is hinged to one end of the connecting block through a rotating shaft, the other end of the check block is connected with the connecting block through the elastic telescopic piece, and a first lock hole is formed in the end, close to the rotating shaft, of the connecting block. A second lock hole matched with the first lock hole is formed in the stop block; at the first position, the first lock hole and the second lock hole are aligned and are limited through the plug pin, the stop block is contained in the connecting block, and the elastic telescopic piece is compressed; at the second position, the first lock hole and the second lock hole are staggered, the end, away from the rotating shaft, of the check block is inclined and located outside the connecting block, the elastic telescopic piece stretches out, and the top face, located outside the connecting block, of the check block forms a limiting face. According to the utility model, the safety protection of the undercarriage in the test process can be ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of aircraft landing gear testing, in particular to a landing gear drop shock test protection device and a drop shock test bench. Background Art

[0002] In the entire cycle of aircraft landing gear, from product design and development to the identification test stage, the drop test is an indispensable link in the product development process. In order to prevent the structural components of the aircraft from being overloaded during the landing impact, the landing gear must effectively absorb the energy generated by the landing impact. The drop test needs to verify whether the landing gear buffer system meets the absorption of the design work, whether the landing gear overload, support, and tire use travel meet the design requirements, and whether the structure reaches the expected strength and stiffness. Therefore, the landing gear drop test is particularly important for the entire development cycle of the landing gear.

[0003] like Figure 1 As shown, the existing landing gear drop test bench includes a vertical beam 3, a hanging basket 5 and a force measuring platform 4. The landing gear 6 is installed on the hanging basket 5. During the test, the wheels on the landing gear 6 are in contact with the force measuring platform 4 to detect the landing anti-seismic performance of the entire landing gear 6. When performing the drop test, if the landing gear drop test fails due to a tire blowout or other force majeure factors, the height of the hanging basket 5 and the landing gear 6 will fall with gravity. At this time, the wheel hub or the structural components of the landing gear 6 will be in hard contact with the force measuring platform 4, thereby causing damage or destruction to the landing gear 6 and the force measuring platform 4. In addition, during the intermission stage of the drop test, the operator needs to inspect or repair the landing gear 6. At this time, the hanging basket 5 and the landing gear 6 thereon need to be raised and fixed to ensure that there is enough maintenance space to prevent the landing gear 6 from falling suddenly. Utility Model Content

[0004] The utility model aims to provide a landing gear drop shock test protection device, which can ensure the safety protection of the landing gear during the test process.

[0005] The technical solution of the utility model is: a landing gear drop shock test protection device, comprising a connecting block, an elastic telescopic member and a stopper, one end of the stopper is hinged to one end of the connecting block through a rotating shaft, the other end of the stopper is connected to the connecting block through an elastic telescopic member, an end of the connecting block close to the rotating shaft is provided with a first locking hole, and a second locking hole adapted to the first locking hole is provided on the stopper; the hinged stopper forms a first position and a second position, when in the first position, the first locking hole is aligned with the second locking hole and limited by a latch, the stopper is accommodated in the connecting block, and the elastic telescopic member is compressed; when in the second position, the first locking hole is staggered with the second locking hole, the end of the stopper away from the rotating shaft is inclined and located outside the connecting block, the elastic telescopic member extends out, and the top surface of the stopper located outside the connecting block forms a limiting surface.

[0006] Preferably, the landing gear drop shock test protection device also includes a guard plate; the connecting block includes a first bottom plate and two first side plates connected to the first bottom plate, and the stop block is hinged to the two first side plates on the side away from the first bottom plate; the guard plate includes a second bottom plate and two second side plates connected to the second bottom plate, the second bottom plate is provided with a notch adapted to the stop block, the guard plate is mounted on the connecting block, the second side plate is located on the outside of the first side plate and the first bottom plate, the elastic telescopic member connects the first bottom plate and the stop block, and when in the first position, the stop block is simultaneously accommodated between the notch and the two first side plates.

[0007] Preferably, a groove is provided on a side of the second bottom plate facing the second side plate, and an end portion of the first side plate extends into the groove.

[0008] Preferably, the second side plate is provided with a third lock hole matched with the first lock hole, and when in the first position, the latch is inserted into the first lock hole, the second lock hole and the third lock hole at the same time.

[0009] Preferably, in the second position, the limiting surface is a horizontal surface.

[0010] Preferably, the elastic telescopic member is a spring.

[0011] The utility model also provides a landing gear drop shock test bench, comprising a base, a vertical beam arranged on the base, a force measuring platform placed on the base, a hanging basket slidably arranged on the vertical beam and the above-mentioned landing gear drop shock test protection device, wherein the connecting block of the landing gear drop shock test protection device is connected to the vertical beam, and when in the first position, the bottom of the hanging basket contacts the limit surface.

[0012] Preferably, at least two landing gear drop shock test protection devices are arranged at intervals in the height direction of the same vertical beam.

[0013] Compared with the related art, the beneficial effects of the utility model are:

[0014] 1. In the event of a sudden tire blowout or force majeure during the landing gear drop test, the stopper placed in the second position can limit the position of the hanging basket and the landing gear to prevent the landing gear from continuing to fall under the action of inertia and causing damage to the force measuring platform;

[0015] 2. The block can be placed in the second position during the intermittent phase of the test to limit the position of the hanging basket and the landing gear, so that the operator can perform maintenance, testing and troubleshooting in a safe environment with sufficient working space;

[0016] 3. The landing gear drop test bench provided by the utility model is provided with two protection devices in the height direction of the same vertical beam, and the states of the two protection devices are switched respectively, which can ensure the safety protection of the landing gear during the test, and also ensure the corresponding maintenance of the landing gear under the premise of safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of an existing landing gear drop shock test bench;

[0018] Figure 2 A schematic diagram of the structure of the landing gear drop shock test protection device provided by the utility model when it is placed in the first position;

[0019] Figure 3 for Figure 2 A cross-sectional schematic diagram of

[0020] Figure 4 A schematic diagram of the structure of the landing gear drop shock test protection device provided by the utility model when it is placed in the second position;

[0021] Figure 5 for Figure 4 A cross-sectional schematic diagram of

[0022] Figure 6 The figure is a schematic diagram of the installation of the connecting block and the stopper;

[0023] Figure 7 is a schematic diagram of the structure of the guard plate;

[0024] Figure 8 The utility model is a schematic structural diagram of a landing gear drop shock test bench.

[0025] In the accompanying drawings: 1. landing gear drop shock test protection device; 11. connecting block; 111. first bottom plate; 112. first side plate; 113. first accommodating space; 114. first locking hole; 12. elastic telescopic member; 13. stopper; 131. limiting surface; 132. second locking hole; 14. guard plate; 141. second bottom plate; 142. second side plate; 143. notch; 144. second accommodating space; 145. groove; 15. rotating shaft; 16. latch; 2. base; 3. vertical beam; 4. force measuring platform; 5. hanging basket; 6. landing gear; 7. slot plate; 71. slot hole. DETAILED DESCRIPTION

[0026] The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other without conflict. For the convenience of description, if the words "upper", "lower", "left" and "right" appear in the following text, they only indicate that the upper, lower, left and right directions are consistent with the drawings themselves, and do not limit the structure.

[0027] like Figure 4 As shown, a landing gear drop shock test protection device 1 provided in this embodiment includes a connecting block 11, an elastic telescopic member 12, a stopper 13, a guard plate 14, a rotating shaft 15 and a latch 16.

[0028] like Figure 6 As shown, the connection block 11 includes a first bottom plate 111 and two first side plates 112 connected to the first bottom plate 111 , and a first accommodating space 113 is provided on one side of the two first side plates 112 away from the first bottom plate 111 .

[0029] like Figure 4 , Figure 6 As shown, the stopper 13 is placed in the first accommodating space 113, and one end of the stopper 13 is hinged to the two first side plates 112 through a rotating shaft 15. The other end of the stopper 13 is connected to the first bottom plate 111 through an elastic telescopic member 12. The elastic telescopic member 12 is a spring. A first locking hole 114 is provided at one end of the first side plate 112 close to the rotating shaft 15, and a second locking hole 132 adapted to the first locking hole 114 is provided on the stopper 13.

[0030] like Figure 4 , Figure 7 As shown, the guard plate 14 includes a second bottom plate 141 and two second side plates 142 connected to the second bottom plate 141. The second bottom plate 141 is provided with a notch 143 adapted to the stopper 13. A second accommodating space 144 is formed between the two second side plates 142, and a groove 145 is provided on the side of the second bottom plate 141 facing the second side plate 142, and the groove 145 is communicated with the second accommodating space 144. The guard plate 14 is sleeved on the connecting block 11, and the connecting block 11 is placed in the second accommodating space 144. The second side plate 142 is located outside the first side plate 112 and the first bottom plate 111, and the end of the first side plate 112 extends into the groove 145. The guard plate 14 is used to protect the connecting block 11 and the stopper 13. The second side plate 142 is provided with a third lock hole 146 adapted to the first lock hole 114.

[0031] The hinged stopper 13 is formed with a first position and a second position. Figure 2 , Figure 3 As shown, in the first position, the first locking hole 114, the second locking hole 132 and the third locking hole 146 are aligned and limited by the latch 16. The stopper 13 is simultaneously received between the notch 143 and the two first side plates 112, and the outer surface of the stopper 13 is flush with the outer surface of the second bottom plate 141. The elastic telescopic member 12 is compressed.

[0032] like Figure 4 , Figure 5 As shown, in the second position, the latch 16 is pulled out, and under the action of the elastic telescopic member 12, the first lock hole 114 and the second lock hole 132 are staggered, and the end of the stopper 13 away from the rotating shaft 15 is inclined and located outside the connecting block 11, and the elastic telescopic member 12 is extended, and the top surface of the stopper 13 located outside the connecting block 11 forms a limiting surface 131. At this time, the limiting surface 131 is horizontal.

[0033] like Figure 8 As shown, the utility model also provides a landing gear drop shock test bench, comprising a base 2, a vertical beam 3 arranged on the base 2, a force measuring platform 4 placed on the base 2, a hanging basket 5 slidably arranged on the vertical beam 3, and the above-mentioned landing gear drop shock test protection device 1. The hanging basket 5 is located above the force measuring platform 4.

[0034] There are four vertical beams 3, two of which are close to each other and have groove plates 7 installed on their side surfaces. The groove plates 7 are provided with groove holes 71 for accommodating the connecting blocks 11. Two landing gear drop shock test protection devices 1 are arranged at intervals in the height direction of the same vertical beam 3. The spacing between the two landing gear drop shock test protection devices 1 on the same vertical beam 3 is calculated in combination with the K value of the products of different models installed. The first bottom plate 111 and the second side plate 142 are connected to the corresponding positions on the vertical beam 3. The groove plate 7 is a multi-section structure, and the protection device 1 is installed at the section. The outer surface of the second bottom plate 141 is flush with the outer surface of the groove plate 7.

[0035] During the test, the landing gear 6 is installed at the bottom of the hanging basket 5, the upper stopper 13 is placed in the first position, and the lower stopper 13 is placed in the second position, so that the bottom of the hanging basket 5 is in contact with the limit surface 131, thereby ensuring that the landing gear 6 and the force measuring platform 4 can be protected in the event of an accident during the drop shock test.

[0036] During inspection and maintenance, the hanging basket 5 is raised, the upper block 13 is placed in the second position, the bottom of the hanging basket 5 is in contact with the limiting surface 131, and the lower block 13 is placed in the first position, which can provide sufficient maintenance space.

[0037] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A landing gear drop shock test protection device, characterized in that: It includes a connecting block, an elastic telescopic member and a stopper, one end of the stopper is hinged to one end of the connecting block through a rotating shaft, and the other end of the stopper is connected to the connecting block through an elastic telescopic member, an end of the connecting block close to the rotating shaft is provided with a first locking hole, and the stopper is provided with a second locking hole adapted to the first locking hole; the hinged stopper forms a first position and a second position, when in the first position, the first locking hole is aligned with the second locking hole and limited by a latch, the stopper is accommodated in the connecting block, and the elastic telescopic member is compressed; when in the second position, the first locking hole is staggered with the second locking hole, the end of the stopper away from the rotating shaft is inclined and located outside the connecting block, the elastic telescopic member extends out, and the top surface of the stopper located outside the connecting block forms a limiting surface.

2. The landing gear drop shock test protection device according to claim 1, characterized in that: It also includes a guard plate; the connecting block includes a first bottom plate and two first side plates connected to the first bottom plate, and the stop block is hinged to the two first side plates on the side away from the first bottom plate; the guard plate includes a second bottom plate and two second side plates connected to the second bottom plate, and the second bottom plate is provided with a notch adapted to the stop block, the guard plate is mounted on the connecting block, and the second side plate is located on the outside of the first side plate and the first bottom plate, the elastic telescopic member connects the first bottom plate and the stop block, and when in the first position, the stop block is simultaneously accommodated between the notch and the two first side plates.

3. The landing gear drop shock test protection device according to claim 2, characterized in that: A groove is provided on one side of the second bottom plate facing the second side plate, and an end portion of the first side plate extends into the groove.

4. The landing gear drop shock test protection device according to claim 2, characterized in that: The second side plate is provided with a third lock hole matched with the first lock hole. When in the first position, the latch is inserted into the first lock hole, the second lock hole and the third lock hole at the same time.

5. The landing gear drop shock test protection device according to claim 1, characterized in that: In the second position, the limiting surface is a horizontal surface.

6. The landing gear drop test protection device according to claim 1, characterized in that: The elastic telescopic member is a spring.

7. A landing gear drop test bench, comprising a base, a vertical beam arranged on the base, a force measuring platform placed on the base, and a hanging basket slidably arranged on the vertical beam, characterized in that: It also includes a landing gear drop shock test protection device as described in any one of claims 1-6, wherein the connecting block of the landing gear drop shock test protection device is connected to the vertical beam, and when in the first position, the bottom of the hanging basket contacts the limit surface.

8. The landing gear drop test bench according to claim 7, characterized in that: At least two landing gear drop shock test protection devices are arranged at intervals in the height direction of the same vertical beam.

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