Limiting mechanism of dragging type test bed and dragging type engine test bed

Abstract

The utility model discloses a limiting mechanism of a dragging type test bed and the dragging type engine test bed, belongs to the technical field of aero-engine test, and solves the technical problem that collision and interference are generated when a dragging type preassembling frame and a test bed frame are assembled and disassembled. The limiting mechanism comprises a first limiting piece and a second limiting piece, during use, the first limiting piece and the second limiting piece are installed on a rack and a preassembling frame of a test bed respectively. The first limiting piece comprises a limiting part; the second limiting piece is provided with a rotating shaft and a stop lever; an axial buffer structure is arranged in the stop lever; the stop lever is parallel to the rotating shaft and can rotate around the rotating shaft in the vertical direction. According to the limiting mechanism, the positioning and disassembling process of the dragging type engine test bed can be quicker, more stable and more reliable, and the safety problem caused by collision in the test process is effectively avoided.

Description

TECHNICAL FIELD

[0001] The utility model belongs to aero-engine test run technical field relates to a kind of limiting mechanism and towed engine test run of towed test run stand. BACKGROUND

[0002] In the test run process of aero-engine, to ensure test run safety and accuracy, pre-assembled frame needs to be correctly assembled to test run stand. Under normal circumstances, mechanical limiting part is installed on test run stand. When the limiting plate of pre-assembled frame collides with mechanical limiting part, it can be confirmed that the towed baffle of pre-assembled frame reaches specified position, and then falls into the groove of towed cylinder, and then the cylinder is retracted to pull the towed baffle, so that pre-assembled frame enters coupling position.

[0003] However, when pre-assembled frame is disassembled, because towed cylinder drags towed baffle of pre-assembled frame through two towed blocks of end head, there is inevitable idle stroke between two towed blocks and towed baffle. When towed cylinder reaches pushing stop position, the position of pre-assembled frame may be closer to cylinder than when falling. When jacking mechanism directly pushes pre-assembled frame upward, the limiting plate of pre-assembled frame will interfere with mechanical limiting part, so that engine and pre-assembled frame cannot be smoothly disassembled and transported. On the other hand, when pre-assembled frame is positioned, limiting plate often collides with mechanical limiting part rigidly, which affects the stability of operation and causes component damage. UTILITY MODEL CONTENTS

[0004] In view of the above analysis, the utility model aims at providing a kind of limiting mechanism and towed engine test run of towed test run stand, to solve the technical problem of impact and interference when towed pre-assembled frame is assembled and disassembled with test run stand.

[0005] The purpose of the utility model is mainly realized through the following technical schemes.

[0006] The utility model provides a kind of limiting mechanism of towed test run stand in the first aspect, including first limiting part and second limiting part. First limiting part and second limiting part are respectively installed on the stand of test run stand and pre-assembled frame when using. First limiting part includes limiting part. Second limiting part has shaft and baffle rod. Baffle rod has axial buffer structure inside, which can release mechanical impact generated when limiting part and one end of baffle rod contact limiting. Baffle rod is parallel with shaft and can rotate around shaft in vertical direction, so as to avoid interference of baffle rod to the movement of first limiting part in vertical direction.

[0007] Further, second limiting part includes rotating part, and the rotating part includes a first rotating part, one end of the first rotating part is rotatably connected with the shaft.

[0008] Further, the other end of the first rotating part is fixedly connected with the baffle rod.

[0009] Furthermore, the rotating component also includes a second rotating component.

[0010] Furthermore, one end of the second rotating member is rotatably connected to the rotating shaft and fixedly connected to one end of the first rotating member.

[0011] Furthermore, the second rotating member is arranged radially along the axis of rotation, and the angular interval between the first rotating member and the second rotating member around the axis of rotation is greater than 90°.

[0012] Furthermore, the first limiting member also includes a guide portion, which is an inclined stepped plate.

[0013] Furthermore, the first limiting member also includes a mounting part, which and the limiting part are located at the two ends of the step of the guide part, respectively.

[0014] Furthermore, the axial buffer structure of the stop lever achieves buffering through springs, hydraulic pressure, pneumatic pressure, or rubber.

[0015] On the other hand, this utility model provides a towed engine test stand, including a pre-mounted frame, a stand, a towing cylinder, and a limiting mechanism as described in the first aspect.

[0016] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0017] 1. The limiting mechanism of this utility model, by setting a rotatable stop bar, avoids the stop bar from obstructing the vertical movement of the first limiting member and causing an impact, making the process of the pre-assembly frame descending the platform smoother and more stable, and effectively avoiding test run safety issues.

[0018] 2. The limiting mechanism of this utility model, by setting a stop bar with a buffer knot, can buffer the contact between the limiting part and the stop bar, release the mechanical impact of the pre-assembly frame during the limiting process, make the limiting process of assembly quick, stable and reliable, and also avoid component damage and accidents caused by impact.

[0019] 3. The limiting mechanism of this utility model, by setting a second rotating member, can limit the stop bar to a position above the rotating shaft and close to the center line of the platform, thus ensuring the flexible limiting function of the second limiting member on the first limiting member.

[0020] 4. The towable engine test stand of this utility model, by installing the limiting mechanism of this utility model, enables the engine to be positioned, fixed and removed from the stand in a simple and quick manner, with accurate and reliable positioning, and also effectively avoids safety problems caused by collisions during the test.

[0021] In this invention, the above-described technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of this invention will be set forth in the following description, and some advantages may become apparent from the description or be learned by practicing the invention. The objectives and other advantages of this invention can be realized and obtained through the embodiments described and the accompanying drawings, which are particularly pointed out. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the limiting mechanism of the drag-type test bench according to Embodiment 1 of this utility model;

[0023] Figure 2 This is a schematic diagram of the structure of the first limiting member pushing the second limiting member to rotate in Embodiment 1 of this utility model;

[0024] Figure 3 This is a schematic diagram of the structure of the second limiting member in Embodiment 1 of this utility model;

[0025] Figure 4 This is a schematic diagram of the overall structure of the towed engine test stand according to Embodiment 2 of this utility model;

[0026] Figure 5 This is a schematic diagram of the position and structure of the dragging baffle when the dragging cylinder retracts in Embodiment 2 of this utility model;

[0027] Figure 6 This is a schematic diagram of the position and structure of the dragging baffle when the dragging cylinder extends in Embodiment 2 of this utility model.

[0028] Figure label:

[0029] 1-First limiting member; 11-Mounting part; 12-Limiting part; 13-Guide part; 2-Second limiting member; 21-Fixing member; 211-Rotating shaft; 22-Rotating member; 221-First rotating member; 222-Second rotating member; 223-Stop bar;

[0030] 100-Pre-installation frame; 110-Drag baffle; 111-Clamping part; 200-Frame; 300-Drag cylinder; 310-First stop block; 320-Second stop block; 330-Card slot. Detailed Implementation

[0031] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0032] Example 1

[0033] This embodiment provides a limiting mechanism for a drag-type test bench, which is used to limit the position of the pre-assembly frame of the test bench along the center line direction to a specified assembly position during assembly.

[0034] like Figure 1 and Figure 2 As shown, the limiting mechanism of this embodiment includes a first limiting member 1 and a second limiting member 2. In use, the first limiting member 1 and the second limiting member 2 are respectively installed on the test bench and the pre-assembly frame. The first limiting member 1 includes a limiting part 12. The second limiting member 2 has a rotating shaft 211 and a stop bar 223. The stop bar 223 has an axial buffer structure, which can release the collision generated when the limiting part 12 contacts and limits one end of the stop bar 223. The stop bar 223 is parallel to the rotating shaft 211 and can rotate around the rotating shaft 211 in the vertical direction, thereby avoiding interference of the stop bar 223 with the movement of the first limiting member 1 in the vertical direction.

[0035] Specifically, such as Figure 1 As shown, the first limiting member 1 includes a mounting part 11, a limiting part 12, and a guide part 13. The mounting part 11 and the limiting part 12 are located at the two ends of the inclined trapezoid of the first limiting member 1, respectively. The mounting part 11 is located at the bottom end of the first limiting member 1 and is used to fix it to the pre-assembly frame of the test bench. The guide part 13 is an inclined stepped plate located between the mounting part 11 and the limiting part 12, so that the inclined trapezoid of the first limiting member 1 is inclined upward from the mounting part 11 and outward from the pre-assembly frame of the test bench, so as to ensure that the limiting part 12 is located above and outside the pre-assembly of the test bench, thereby playing the role of contacting and limiting the second limiting member 2.

[0036] like Figure 1 As shown, the limiting part 12 is located above the top horizontal step of the guide part 13. Preferably, the limiting part 12 is a vertically arranged flat plate. The limiting part 12 is perpendicular to the direction in which the first limiting member 1 is horizontally dragged, and is located at the front end or rear end of the direction in which the first limiting member 1 is horizontally dragged, so that the outer surface of the limiting part 12 can contact the second limiting member 2 arranged along the dragging direction to determine that the pre-assembly frame of the test bench is located in the designated position.

[0037] Preferably, the limiting portion 12 extends downward to connect with the mounting portion 11 to increase the firmness of the limiting portion 12.

[0038] like Figure 3 As shown, the second limiting member 2 is an assembly, including a fixing member 21 and a rotating member 22.

[0039] The fixing component 21 is fixedly connected to the test bench frame by threads, and the fixing component 21 includes a rotating shaft 211.

[0040] The rotating component 22 includes a first rotating component 221, a second rotating component 222, and a stop rod 223. One end of the first rotating component 221 is sleeved on the outer circumference of the rotating shaft 211, and the other end is fixedly connected to the stop rod 223; the stop rod 223 is arranged parallel to the rotating shaft 211 and can rotate around the rotating shaft 211.

[0041] The second rotating member 222 is used to restrict the stop bar 223 from rotating downward around the rotating shaft 211. One end of the second rotating member 222 is rotatably connected to the rotating shaft 211 and fixedly connected to one end of the first rotating member 221. The second rotating member 222 is arranged radially along the rotating shaft 211. The angular interval between the first rotating member 221 and the second rotating member 222 around the rotating shaft 211 is greater than 90°, so as to ensure that when one side of the second rotating member 222 abuts against the test bench, the first rotating member 221 is located obliquely above the rotating shaft 211, so that the stop bar 223 can be limited to the obliquely above the rotating shaft 211 and close to the center line of the test bench.

[0042] Preferably, in order to avoid a hard collision when the limiting part 12 and one end of the stop bar 223 come into contact, the stop bar 223 in this embodiment adopts a buffer. The buffer is a hydraulic, spring or pneumatic damper, which can buffer the contact between the limiting part 12 and the stop bar 223 and release the mechanical impact of the pre-installed frame.

[0043] Example 2

[0044] This embodiment provides a towed engine test stand, including the limiting mechanism of the towed test stand in Embodiment 1.

[0045] like Figure 4 As shown, the engine test bench in this embodiment also includes a pre-mounted frame 100, a test bench 200, and a drag cylinder 300. Both the pre-mounted frame 100 and the test bench 200 are frame structures. The pre-mounted frame 100 is used to mount the engine to be tested, the test bench 200 is fixed in position, and the drag cylinder 300 is fixed below the test bench 200. During engine test fixing, after the pre-mounted frame 100 is moved to the pre-mounted position on the test bench 200, the drag cylinder 300 can horizontally drag the pre-mounted frame 100 into the coupling position with the test bench 200, thus fixing the pre-mounted frame 100. After the test is completed, the drag cylinder 300 can horizontally push the pre-mounted frame 100 away from the coupling position with the test bench 200, so that the pre-mounted frame 100 can rise upwards and be removed from the test bench 200.

[0046] It should be noted that the pre-assembly frame 100 and the platform 200 are fixed together by the cooperation of a plug-in pin and a plug-in hole. The plug-in pin includes two sets of hydraulic cylinder actuators, each of which includes a hydraulic cylinder and two travel limit switches, enabling controllable insertion and removal of the pin. The fixing method between the pre-assembly frame 100 and the platform 200 is prior art and not an improvement of this utility model, and will not be elaborated here.

[0047] like Figure 4 As shown, a first limiting member 1 is installed on the pre-assembly frame 100. The mounting part 11 is fixedly connected to the pre-assembly frame 100 by bolts. Since the guide part 13 is an inclined stepped shape, after installation, the limiting part 12 is located above the pre-assembly frame 100 and on the outside of the frame, so as to facilitate contact and limiting with the second limiting member 2, so as to avoid other contact or collision of the pre-assembly frame 100 during the positioning process.

[0048] like Figure 3 and Figure 4 As shown, a second limiting member 2 is installed on the platform 200, and a fixing member 21 is bolted to the platform 200. The rotating shaft 211 is parallel to the inner frame side wall of the platform 200. After installation, the second rotating member 222 is located below the rotating shaft 211, with one side abutting against the inner side wall of the platform 200, so that the first rotating member 221 tilts upward and inward, ensuring that the stop bar 223 can be located on the side obliquely above the rotating shaft 211, close to the center line of the platform 200.

[0049] like Figure 5 and Figure 6 As shown, the pre-assembly frame 100 includes a drag baffle 110, which is located at the bottom of the pre-assembly frame 100 and is a vertically arranged flat plate. The upper end of the drag baffle 110 is fixed to the pre-assembly frame 100, and the lower end is provided with a locking part 111 for matching with the dragging component at the end of the drag cylinder 300. Preferably, the locking part 111 is a semi-circular groove that matches the outer periphery of the end of the drag cylinder 300 so that the drag baffle 110 can fall and fit against the outer periphery of the piston rod, allowing the end of the drag cylinder 300 to drag and push the drag baffle 110.

[0050] like Figure 5 and Figure 6 As shown, the piston rod of the drag cylinder 300 is coaxially fitted with a first stop 310 and a second stop 320. A groove 330 is provided between the first stop 310 and the second stop 320, and the second stop 320 is closer to the drag cylinder 300 than the first stop 310. The width of the groove 330 is greater than the thickness of the drag baffle 110. Preferably, the width of the groove 330 is 3 or 4 times the thickness of the drag baffle 110 to ensure that the drag baffle 110 can be located between the first stop 310 and the second stop 320 when the pre-mounted frame 100 falls.

[0051] During engine testing, the pre-mounted frame 100 is first transported above the test bench 200, and the piston rod of the drag cylinder 300 is extended to the preset drag position. Importantly, according to the designed mating dimensions, when the limiting part 12 abuts against one end of the stop lever 223, the drag baffle 110 should be positioned above the slot 330. However, to ensure that the drag baffle 110 can smoothly descend into the slot 330, gaps should be left between both sides of the drag baffle 110 and the first stop block 310 and the second stop block 320.

[0052] After confirming that the limiting part 12 abuts against one end of the stop lever 223, lower the pre-installation frame 100 until the drag baffle 110 falls into the slot 330, and the engaging part 111 engages with the outer diameter of the piston rod. Retract the piston rod of the drag cylinder 300, as... Figure 5 As shown, the first stop 310 drives the drag baffle 110 to move towards the drag cylinder 300, thereby coupling the pre-assembly frame 100 and the test bench 200 together through the pin system, completing the assembly and fixing. When the engine test is completed, the piston rod of the drag cylinder 300 is extended, as shown... Figure 6 As shown, the second stop 320 pushes the drag baffle 110 to move away from the drag cylinder 300, thus disengaging the pin system. Since there should be gaps between both sides of the drag baffle 110 and the first stop 310 and the second stop 320, the piston rod of the drag cylinder 300 inevitably has a free stroke. Therefore, when the drag cylinder 300 returns to the extended position, one side of the drag baffle 110 is in contact with the inner wall of the second stop 320, and the limiting part 12 is located below the stop rod 223. Figure 2 As shown, when the pre-assembly frame 100 is raised vertically, the limiting part 12 will contact the lower part of the stop bar 223 and exert an upward thrust. The stop bar 223 will then rotate upward around the pivot 211, allowing the first limiting member 1 to continue moving vertically upward until the first limiting member 1 moves to the point of separation from the stop bar 223. Under the action of gravity, the stop bar 223 will rotate downward. When the second rotating member 222 abuts against the inner wall of the platform 200, the stop bar 223 will stop rotating and be limited to the upper side of the pivot 211.

[0053] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model should be included within the protection scope of the present utility model.

Claims

1. A limiting mechanism of a towed test bed, characterized in that, The first limiting part (1) and the second limiting part (2) are respectively installed on a rack of a test bed and a preloading rack during use. The first limiting part (1) comprises a limiting part (12). The second limiting part (2) has a rotating shaft (211) and a blocking rod (223). The blocking rod (223) has an axial buffering structure, which can release mechanical impact generated when the limiting part (12) contacts one end of the blocking rod (223) for limiting. The blocking rod (223) is parallel to the rotating shaft (211) and can rotate around the rotating shaft (211) in the vertical direction, thereby avoiding interference of the blocking rod (223) with movement of the first limiting part (1) in the vertical direction.

2. The limiting mechanism of the towed test bed according to claim 1, wherein The second limiting part (2) comprises a rotating part (22), and the rotating part (22) comprises a first rotating part (221).

3. The limiting mechanism of the towed test bed according to claim 2, wherein One end of the first rotating part (221) is rotationally connected with the rotating shaft (211).

4. The limiting mechanism of the towed test bed according to claim 3, wherein The blocking rod (223) is fixedly connected with the other end of the first rotating part (221).

5. The limiting mechanism of the towed test bed according to claim 4, wherein The rotating part (22) further comprises a second rotating part (222).

6. The limiting mechanism of the towed test bed according to claim 5, wherein One end of the second rotating part (222) is rotationally connected with the rotating shaft (211) and fixedly connected with one end of the first rotating part (221).

7. The limiting mechanism of the towing test bed according to claim 6, wherein The second rotating part (222) is arranged along a radial direction of the rotating shaft (211), and an angle interval between the first rotating part (221) and the second rotating part (222) around the rotating shaft (211) is greater than 90°.

8. The limiting mechanism of the towing test bed according to claim 7, wherein The first limiting part (1) further comprises a guide part (13), and the guide part (13) is an inclined stepped plate.

9. The limiting mechanism of the towing test bed according to any one of claims 1 to 8, characterized in that, The first limiting part (1) further comprises a mounting part (11), and the mounting part (11) and the limiting part (12) are respectively located at two ends of steps of the guide part (13).

10. A motored engine test bed, characterized by, The axial buffering structure of the blocking rod (223) is achieved by a spring, hydraulic pressure, air pressure or rubber. The preloading rack (100), the rack (200), the dragging oil cylinder (300) and the limiting mechanism of any one of claims 1 to 9 are comprised.

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