Connecting rod fatigue test device

Abstract

The utility model provides a connecting rod fatigue test device. The device comprises a bottom plate, a vertical plate, a small end fixing part and a loading part, wherein the vertical plate is fixedly connected to the bottom plate, comprises a first side wall and a second side wall, and is provided with a first through hole; the small end fixing part comprises a limiting shell and a first cover plate; the limiting shell is fixedly connected to the first side wall and provided with an arc-shaped through opening used for containing the small end of the connecting rod, and a receding opening used for receding a rod body of the connecting rod is formed in the arc opening side of the arc-shaped through opening. The arc-shaped through hole is communicated with the first through hole; the first cover plate is connected to the limiting shell in an openable and closable manner; the loading part comprises a motor base, a motor and a loading shaft; the motor base is fixedly connected to the second side wall, the motor is fixedly connected to the motor base, and the loading shaft is eccentrically connected with the motor, penetrates through the first through hole and extends into the arc-shaped through opening.

Description

TECHNICAL FIELD

[0001] The utility model relates to connecting rod test testing technical field especially relates to a connecting rod fatigue test device. BACKGROUND

[0002] There are many adjusting mechanisms in an aero-engine, for example, the variable stator vane (VSV) mechanism of the aero-engine compressor. Whether it is a torsion bar type VSV mechanism or a crank type VSV mechanism, the core components thereof are connected by a connecting rod for torsion transmission. In particular, the current aero-engine generally adopts a multi-stage cascade adjusting design, and the working load of the connecting rod is large. The reliability of the working of the connecting rod determines the adjusting precision, and has a direct impact on the performance of the compressor. Therefore, attention must be paid to the fatigue and wear of the connecting rod, which may cause the adjusting precision to decrease.

[0003] At present, there is a lack of a connecting rod fatigue test device capable of simulating the rotation loading of a pin shaft in a hole of a connecting rod to expose the fatigue and wear problems that may occur in the working of the connecting rod. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a connecting rod fatigue test device.

[0005] According to the connecting rod fatigue test device of the utility model, including: bottom plate, stand, small end fixed part and loading part, wherein, the stand is fixedly connected in the bottom plate, and includes first side wall and second side wall, and is equipped with first through -hole, the small end fixed part includes spacing shell and first cover plate, the spacing shell is fixedly connected in the first side wall, and is equipped with the arc mouth for accommodating the small end of connecting rod, and is equipped with the accommodation mouth of avoiding connecting rod rod body in the arc opening side of arc mouth, the arc mouth with first through -hole is through, the first cover plate is open and shut to be connected in the spacing shell, the loading part includes motor base, motor and loading shaft, the motor base is fixedly connected in the second side wall, the motor is fixedly connected in the motor base, the loading shaft is eccentrically connected with the motor, and passes from the first through -hole, extends to the inside of arc mouth.

[0006] The technical scheme of the present application is designed by the small end fixed part and the loading part, which provides periodic extrusion load under the eccentric rotation of the loading shaft and repeated collision with the inner wall of the small end hole of the connecting rod under the driving of the motor, thereby simulating the rotation of the piston pin in the small end hole of the connecting rod and the working state of the connecting rod under the load fatigue and wear in the actual working condition. In addition, the test device has a simple structure, is easy to disassemble, use and operate, and has high test efficiency.

[0007] In some embodiments, the loading part includes a rotating disc; the rotating disc is fixedly connected with the motor and the loading shaft respectively, so that the loading shaft is eccentric to the motor.

[0008] In some embodiments, a gap is provided between the loading shaft and the small-end hole of the connecting rod. A conventional connecting rod test device usually uses an interference fit between the hole and the pin when fixing the connecting rod, while in actual working conditions, the connecting rod hole and the pin shaft are usually gap fit, so that the gap provided between the loading shaft and the small-end hole of the connecting rod can better simulate the actual working conditions of the connecting rod.

[0009] In some embodiments, the loading shaft is in contact with the first cover plate.

[0010] In some embodiments, the connecting rod fatigue test device further comprises an oil supply part; the oil supply part comprises an oil box and an oil supply pipe; the oil box is fixedly connected to the vertical plate and is arranged above the limiting shell; the oil supply pipe communicates the oil box and the arc-shaped opening.

[0011] In actual working conditions, lubricating oil is usually applied between the connecting rod hole and the pin shaft for lubrication. The technical solution of the present application realizes the input of lubricating oil between the loading shaft and the inner wall of the small-end hole through the design of the oil supply part, forms a complete oil film under the action of the gap and rotation load, thereby reducing the rigid impact between the loading shaft and the inner wall of the small-end hole, and more closely simulates the real working environment, so that the fatigue test restoration degree is high, and the problem of easy damage of the loading shaft and the connecting rod is also improved, thereby prolonging the service life of the test device; at the same time, the lubricating oil can be input into the arc-shaped opening under the action of gravity, thereby saving energy.

[0012] In some embodiments, the oil supply part comprises a control valve.

[0013] In some embodiments, the connecting rod fatigue test device further comprises a large-end fixing part; the large-end fixing part comprises a large-end fixing pin shaft and a second cover plate; the large-end fixing pin shaft is fixedly connected to the first side wall and is provided with a positioning shaft shoulder and a threaded hole at the shaft end; the second cover plate is provided with a stud matched with the threaded hole at the shaft end and is provided with a first rotating handle.

[0014] The design of the large-end fixing part provided by the present application is beneficial to stably fixing the connecting rod, and the disassembly, assembly and use operation are simple and convenient.

[0015] In some embodiments, the connecting rod fatigue test device further comprises a rod body fixing part; the rod body fixing part is fixedly connected to the vertical plate and is used for abutting against the connecting rod rod body.

[0016] In some embodiments, the rod fixing part comprises a first supporting plate, a second supporting plate, a screw rod, a movable plate, a second rotating handle and a fixed plate; the first supporting plate is fixedly connected to the vertical plate and used for abutting against the connecting rod rod body; the second supporting plate is fixedly connected to the vertical plate and is provided with a threaded hole; the screw rod is matched with the threaded hole; the movable plate is connected to the first end of the screw rod through a bearing; the second rotating handle is fixedly connected to the second end of the screw rod; the fixed plate is fixedly connected to the first side wall and is provided with a sliding groove; the movable plate is provided with a sliding block which is slidingly connected with the sliding groove; rotating the second rotating handle can make the screw rod and the movable plate move relative to the second supporting plate, and make the movable plate abut against or move away from the connecting rod rod body.

[0017] The rod fixing part provided by the application is beneficial to the stability of the connecting rod and is easy to operate; the design of the sliding groove and the sliding block is beneficial to the stable movement of the movable plate along with the screw rod.

[0018] In some embodiments, the sliding groove and the sliding block are one or two. BRIEF DESCRIPTION OF DRAWINGS

[0019] The above features and advantages of the present application can be better understood by reading the detailed description of the embodiments of the application in conjunction with the following drawings. Identical reference signs are used throughout the drawings to indicate identical features, and it should be noted that the drawings are merely examples and are not drawn according to the scale, and should not be used as a limitation on the scope of protection actually required by the present application. In the drawings:

[0020] Figure 1 Fig. 1 is a structural schematic view of a connecting rod fatigue test device and a connecting rod according to an embodiment of the present application;

[0021] Figure 2 Fig. 1 is a structural schematic view of a connecting rod fatigue test device and a connecting rod according to an embodiment of the present application;

[0022] Figure 3 Fig. 1 is a structural schematic view of a connecting rod fatigue test device and a connecting rod according to an embodiment of the present application;

[0023] Figure 4 Fig. 1 is a structural schematic view of a connecting rod fatigue test device and a connecting rod according to an embodiment of the present application.

[0024] Reference signs:

[0025] 100. connecting rod; 110. small end of connecting rod; 120. large end of connecting rod; 130. connecting rod rod body;

[0026] 200. connecting rod fatigue test device; 210. bottom plate; 211. vertical plate; 212. first side wall; 213. second side wall; 214. first through hole; 220. small end fixing part; 221. limiting shell; 222. first cover plate; 223. arc-shaped through port; 224. clearance port; 225. bolt; 230. loading part; 231. motor base; 232. motor; 233. loading shaft; 234. rotating disc; 240. oil supply part; 241. oil box; 242. oil delivery pipe; 243. control valve; 250. large end fixing part; 251. large end fixing pin shaft; 252. second cover plate; 253. positioning shaft shoulder; 254. shaft end threaded hole; 255. stud; 256. first rotating handle; 260. rod body fixing part; 261. first support plate; 262. second support plate; 263. screw rod; 264. movable plate; 265. second rotating handle; 266. fixed plate; 267. threaded through hole; 268. first end part; 269. second end part; 270. sliding groove; 271. sliding block. DETAILED DESCRIPTION

[0027] Reference will now be made in detail to various embodiments of the present application, examples of which are illustrated in the accompanying drawings and described below. While the present application will be described in conjunction with the exemplary embodiments, it should be understood that the present application is not limited to these exemplary embodiments. On the contrary, the present application is intended to cover all alternatives, modifications, equivalents and other embodiments that can be included within the spirit and scope of the present application as defined by the appended claims.

[0028] In the following description, the orientation or positional relationship indicated by "upper", "lower", "left", "right" or other orientation terms is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or component referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0029] Meanwhile, specific words are used in the present application to describe the embodiments of the present application. As "one embodiment" and / or "an embodiment" means a certain feature, structure or characteristic related to at least one embodiment of the present application. Therefore, it should be emphasized and noted that the "one embodiment" or "an embodiment" mentioned in different positions in the specification does not necessarily refer to the same embodiment. In addition, some features, structures or characteristics in one or more embodiments of the present application can be appropriately combined.

[0030] Although the present application takes the test of the connecting rod of the VSV mechanism of the aero-engine as the technical background, it should not be limited thereto, and the connecting rod with the same or similar test requirement is applicable to the fatigue test device disclosed by the present application. Generally, the connecting rod comprises a first end, a second end and a rod body, the first end is provided with a first end hole, and the second end is provided with a second end hole. The present application uses the terms "small end" and "large end" only for the purpose of simplifying the description, which respectively refer to the first end and the second end which the connecting rod usually comprises, and do not indicate that the first end and the second end have a comparative relationship in terms of size. It is easy to understand that any end of the connecting rod with the same or similar test requirement is applicable to the present application.

[0031] At present, it is necessary to further develop the test device of the connecting rod to simulate the load fatigue and wear of the connecting rod under actual working conditions.

[0032] The inventor has conducted in-depth research and proposed a connecting rod fatigue test device 200.

[0033] Reference Figure 1 、 Figure 2 and Figure 4 , comprising a bottom plate 210, a vertical plate 211, a small end fixing part 220 and a loading part 230; wherein the vertical plate 211 is fixedly connected to the bottom plate 210 and comprises a first side wall 212 and a second side wall 213, and is provided with a first through hole 214; the small end fixing part 220 comprises a limiting shell 221 and a first cover plate 222; the limiting shell 221 is fixedly connected to the first side wall 212 and is provided with an arc-shaped through port 223 for accommodating the small end 110 of the connecting rod, and is provided with a clearance port 224 for avoiding the rod body 130 of the connecting rod at the arc opening side of the arc-shaped through port 223; the arc-shaped through port 223 is through the first through hole 214; the first cover plate 222 is connected to the limiting shell 221 in an openable and closable manner, such as being connected by bolts 225, or being connected by hinging, sliding (not shown) and the like. As shown in Figure 2 , the loading part 230 comprises a motor seat 231, a motor 232 and a loading shaft 233; the motor seat 231 is fixedly connected to the second side wall 213, and the motor 232 is fixedly connected to the motor seat 231; the loading shaft 233 is eccentrically connected to the motor 232 and passes through the first through hole 214 and extends into the interior of the arc-shaped through port 223.

[0034] The connecting rod fatigue test device 200 of the above embodiment limits and fixes the connecting rod small end 110 through the stand plate 211, the limiting shell 221 of the small end fixing part 220 and the first cover plate 222. Under the driving of the motor 232, the loading shaft 233 eccentrically rotates and repeatedly collides with the inner wall of the connecting rod small end hole (not shown), thereby providing periodic extrusion load, well simulating the rotation of the piston pin in the connecting rod small end hole and the fatigue load and wear of the connecting rod under actual working conditions. In addition, the connecting rod fatigue test device 200 of the above embodiment has simple structure, easy disassembly, use and operation, and high test efficiency.

[0035] As shown in Figure 2 In some embodiments, the loading part 230 includes a rotating disc 234, which is fixedly connected with the motor 232 and the loading shaft 233, so that the loading shaft 233 is eccentric to the motor 232. At this time, the loading shaft 233 can be a cylindrical shaft, which has the advantages of low processing difficulty and low cost.

[0036] The loading shaft 233 can be gap-fitted with the inner wall of the hole of the connecting rod small end 110, or in some embodiments, a gap is provided between the loading shaft 233 and the connecting rod small end hole. Because the conventional connecting rod test device usually adopts interference fit between the pin and the hole when fixing the connecting rod, and in actual working conditions, the connecting rod hole and the pin shaft are often gap-fitted, which is closer to the actual working state of the connecting rod.

[0037] In some embodiments, the loading shaft 233 is in contact with the first cover plate 222 (not shown), so that the side wall of the loading shaft 233 can be in contact with the entire inner wall of the connecting rod small end hole, which is close to the actual working state.

[0038] Continuing to refer to Figure 1 , Figure 4 In some embodiments, the connecting rod fatigue test device 200 further includes an oil supply part 240. The oil supply part 240 includes an oil box 241 and an oil delivery pipe 242. The oil box 241 is fixedly connected to the stand plate 211 and is arranged above the limiting shell 221. The oil delivery pipe 242 communicates the oil box 241 and the arc-shaped opening 223. The lubricating oil can enter the arc-shaped opening 223 through the oil delivery pipe 242 from the oil box 241 under the action of gravity, drip onto the loading shaft 233, and the loading shaft 233 can be appropriately provided with an oil groove to facilitate the flow of the lubricating oil. Under the eccentric rotation of the loading shaft 233, a complete oil film is formed in the connecting rod small end hole, which has no energy consumption and good lubricating effect.

[0039] As shown in Figure 4As shown, in some embodiments, the oil supply unit 240 includes a control valve 243 for controlling the input and stop of lubricating oil.

[0040] like Figure 3 As shown, in some embodiments, the connecting rod fatigue testing device 200 further includes a large end fixing part 250; the large end fixing part 250 includes a large end fixing pin 251 and a second cover plate 252; the large end fixing pin 251 is fixedly connected to the first side wall 212 and is provided with a shaft end threaded hole 254; the second cover plate 252 is provided with a stud 255 that mates with the shaft end threaded hole 254, and is provided with a first rotating handle 256 for easy operation.

[0041] In some embodiments, the large end fixing pin 251 is provided with a positioning shoulder 253, which abuts against the large end of the connecting rod for positioning; similarly, in some embodiments, the limiting shell 221 is provided with an appropriate step (not shown) abutting against the small end 110 of the connecting rod for positioning.

[0042] Continue to refer to Figure 3 In some embodiments, the connecting rod fatigue testing device 200 further includes a rod fixing part 260; the rod fixing part 260 is fixedly connected to the upright plate 211 and is used to abut against the connecting rod body 130 to fix it, for example, the rod fixing part 260 can be a suitable positioning block, fastening bolt, etc.

[0043] In some embodiments, the rod fixing part 260 includes a first support plate 261, a second support plate 262, a lead screw 263, a movable plate 264, a second rotating handle 265, and a fixed plate 266; the first support plate 261 is fixedly connected to the upright plate 211 and is used to abut against the connecting rod body 130; the second support plate 262 is opposite to the fixed connection to the upright plate 211 and is provided with a threaded through hole 267; the lead screw 263 cooperates with the threaded through hole 267; the movable plate 264 and the first rotating handle 265 of the lead screw 263 are fixed together. End 268 is connected via a bearing; the second rotating handle 265 is fixedly connected to the second end 269 of the lead screw 263; the fixed plate 266 is fixedly connected to the first side wall 212 and is provided with a sliding groove 270; the movable plate 264 is provided with a slider 271 that is slidably connected to the sliding groove 270; rotating the second rotating handle 265 enables the lead screw 263 and the movable plate 264 to move synchronously relative to the second support plate 262, and causes the movable plate 264 to abut against or move away from the connecting rod body 130. The design of the rod body fixing part is more conducive to the stability of the connecting rod and is easy to use; the sliding groove and the slider play a guiding role, which is conducive to the stable movement of the movable plate with the lead screw.

[0044] In some embodiments, the sliding groove 270 and the sliding block 271 are one or two. The sliding groove and the sliding block are one or two, which facilitates the stable translation of the movable plate and avoids the phenomenon of jamming and the like.

[0045] The operation process of the connecting rod fatigue test device 200 of the above-mentioned embodiments is described below, further illustrating the structural features and advantages of the present application.

[0046] In use, the first cover plate 222 is opened, the second cover plate 252 is opened by rotating the first rotating handle 256, and the movable plate 264 is moved to the appropriate position by rotating the second rotating handle 265; the small end 110 of the connecting rod is placed into the arc-shaped opening 223, the loading shaft 233 is inserted into the small end hole of the connecting rod, the connecting rod body 130 contacts the first support plate 261, and the large end fixed pin shaft 251 is inserted into the large end hole of the connecting rod; the first cover plate 222 is closed, the first rotating handle 256 and the second rotating handle 265 are tightened, and the connecting rod 100 is fixed; lubricating oil is placed into the oil box 241, the control valve 243 is opened, and the lubricating oil is input into the arc-shaped opening 223; the motor 232 is started, and the fatigue test is started. The disassembly process after the test is complete is not described again.

[0047] In summary, the beneficial effects of the connecting rod fatigue test device introduced in the above embodiments include but are not limited to:

[0048] (1) The periodic extrusion load is provided to the inner wall of the small end hole of the connecting rod, which well simulates the rotation of the piston pin in the small end hole of the connecting rod under actual working conditions, as well as the fatigue load and wear of the connecting rod. In addition, the test device has a simple structure, is easy to disassemble, use and operate, and has high test efficiency;

[0049] (2) The lubricating oil can be input into the specified position by gravity, without energy consumption, and has good lubricating effect;

[0050] (3) The large end fixing part and the rod body fixing part make the connecting rod fatigue test device work more stably and are easy to operate;

[0051] Although the above-mentioned embodiments are disclosed as preferred embodiments, they are not intended to limit the present application, and any person skilled in the art can make possible changes and modifications without departing from the spirit and scope of the present application. Therefore, any modification, equivalent change and modification of the above-mentioned embodiments according to the technical essence of the present application, which does not deviate from the technical solution of the present application, falls within the protection scope defined by the claims of the present application.

Claims

1. A connecting rod fatigue test device (200) characterized by, The utility model relates to a kind of linkage loading device, including: Bottom plate (210), vertical plate (211), small end fixed part (220) and loading part (230);Wherein, The vertical plate (211) is fixedly connected to the bottom plate (210), and includes first side wall (212) and second side wall (213), and is provided with first through hole (214); The small end fixed part (220) includes limiting shell (221) and first cover plate (222);The limiting shell (221) is fixedly connected to the first side wall (212), and is provided with arc-shaped mouth (223) for accommodating connecting rod small end (110), and is provided with the clearance (224) for avoiding connecting rod body (130) on the arc opening side of the arc-shaped mouth (223);The arc-shaped mouth (223) is through with the first through hole (214);The first cover plate (222) is openably connected to the limiting shell (221); The loading part (230) includes motor base (231), motor (232) and loading shaft (233);The motor base (231) is fixedly connected to the second side wall (213), the motor (232) is fixedly connected to the motor base (231), and the loading shaft (233) is eccentrically connected with the motor (232), and passes from the first through hole (214), and extends to the inside of the arc-shaped mouth (223).

2. The connecting rod fatigue test apparatus (200) according to claim 1, characterized by, The loading part (230) includes rotating disc (234);The rotating disc (234) is fixedly connected with the motor (232) and the loading shaft (233) respectively, so that the loading shaft (233) is eccentric with the motor (232).

3. The connecting rod fatigue test apparatus (200) according to claim 1, characterized by, The gap is provided between the loading shaft (233) and connecting rod small end hole.

4. The connecting rod fatigue test apparatus (200) according to claim 1, characterized by, The loading shaft (233) is in contact with the first cover plate (222).

5. The connecting rod fatigue test apparatus (200) according to claim 1, characterized by, It also includes oil supply part (240);The oil supply part (240) includes oil box (241) and oil delivery pipe (242);The oil box (241) is fixedly connected to the vertical plate (211), and is arranged above the limiting shell (221);The oil delivery pipe (242) communicates the oil box (241) and the arc-shaped mouth (223).

6. The connecting rod fatigue test apparatus (200) according to claim 5, characterized by The oil supply part (240) includes control valve (243).

7. The connecting rod fatigue test apparatus (200) according to claim 1, characterized by It also includes big end fixed part (250);The big end fixed part (250) includes big end fixed pin shaft (251) and second cover plate (252);The big end fixed pin shaft (251) is fixedly connected to the first side wall (212), and is provided with positioning shoulder (253) and shaft end threaded hole (254);The second cover plate (252) is provided with stud (255) matched with the shaft end threaded hole (254), and is provided with first rotating handle (256).

8. The connecting rod fatigue test apparatus (200) according to claim 1, characterized by It also includes rod body fixed part (260);The rod body fixed part (260) is fixedly connected with the vertical plate (211), and is used for abutting with the connecting rod body (130).

9. The connecting rod fatigue test apparatus (200) according to claim 8, characterized by The rod body fixing part (260) comprises a first supporting plate (261), a second supporting plate (262), a screw rod (263), a movable plate (264), a second rotating handle (265) and a fixing plate (266); the first supporting plate (261) is fixedly connected to the vertical plate (211) and is used for abutting against the connecting rod rod body (130); the second supporting plate (262) is fixedly connected to the vertical plate (211) and is provided with a threaded through hole (267); the screw rod (263) is matched with the threaded through hole (267); the movable plate (264) is connected to a first end portion (268) of the screw rod (263) through a bearing; the second rotating handle (265) is fixedly connected to a second end portion (269) of the screw rod (263); the fixing plate (266) is fixedly connected to the first side wall (212) and is provided with a sliding groove (270); the movable plate (264) is provided with a sliding block (271) which is slidingly connected with the sliding groove (270); rotating the second rotating handle (265) can make the screw rod (263) and the movable plate (264) move relative to the second supporting plate (262) and make the movable plate (264) abut against or be away from the connecting rod rod body (130).

10. The connecting rod fatigue test apparatus (200) according to claim 9, characterized by The sliding groove (270) and the sliding block (271) are one or two.

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