Connecting rod strength detection equipment

Abstract

The invention relates to the technical field of connecting rod detection, and particularly discloses connecting rod strength detection equipment. The hydraulic machine is arranged on the detection table, and the output end of a piston rod of the hydraulic machine is provided with a first clamping assembly which can be clamped with the small end of the connecting rod; the top of the rotary table is eccentrically connected with a second clamping assembly capable of clamping the large end of the connecting rod; the second clamping assembly comprises a guide column which is arranged on the rotating disc and can stretch into the connecting rod large head, a ball which is arranged on the side wall of the guide column and is attached to the wall face of the connecting rod large head, and a fastening screw which fixes the guide column and the connecting rod large head. The process that a piston in an engine drives a connecting rod to move under the action of air pressure is simulated, so that the motion state of the connecting rod is simulated, various forces and stresses borne by the connecting rod during operation of the engine are simulated, the strength and reliability of the connecting rod in actual use are verified, and the motion process of the connecting rod can be visually observed in the detection process.

Description

Technical Field

[0001] The present application relates to the technical field of connecting rod detection, and specifically discloses a connecting rod strength detection device. Background Art

[0002] The connecting rod is a mechanical component used to connect the piston and the crankshaft, converting the reciprocating motion of the piston into the rotational motion of the crankshaft. It plays a vital role in the engine. Its design, material selection and manufacturing process directly affect the performance and reliability of the engine. The connecting rod is mainly composed of three parts: the part connected to the piston pin is called the small end of the connecting rod; the part connected to the crankshaft is called the big end of the connecting rod, and the rod connecting the small end and the big end is called the connecting rod shaft.

[0003] The main function of the connecting rod is to bear the gas force from the piston pin and transmit this force to the crankshaft, thereby converting the reciprocating motion of the piston into the rotational motion of the crankshaft. In this process, the connecting rod is subjected to alternating loads such as compression and tension, so it must have sufficient fatigue strength and structural rigidity to ensure the strength and stability of the connecting rod under high-speed operation.

[0004] The common method of strength testing of connecting rods is to conduct actual fatigue tests on connecting rods to simulate the various forces and stresses they are subjected to during engine operation in order to verify their strength and reliability in actual use. However, the actual fatigue tests on connecting rods currently mainly rely on placing the connecting rods in the engine for testing, which makes it impossible to directly observe the movement of the connecting rods. In addition, due to the influence of the assembly of the connecting rods with the pistons and crankshafts, it is easy to cause wear on the connecting rod big end bearings and connecting rod bolts, resulting in some connecting rods requiring secondary processing after testing, which increases the processing procedures and costs. Therefore, in view of this, the inventor provides a connecting rod strength testing device to solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to solve the problem that in the traditional connecting rod fatigue test, the connecting rod is placed in the engine for testing, and the movement state of the connecting rod cannot be observed intuitively.

[0006] In order to achieve the above object, the basic scheme of the present invention provides a connecting rod strength detection device, comprising:

[0007] Testing bench;

[0008] A hydraulic press arranged on the inspection platform, wherein the piston rod output end of the hydraulic press is provided with a first clamping assembly which can be clamped with the small end of the connecting rod;

[0009] A turntable is rotatably connected to the detection table, and a second clamping assembly that can clamp the big end of the connecting rod is eccentrically connected to the top of the turntable. The second clamping assembly includes a guide column arranged on the turntable and can extend into the big end of the connecting rod, a ball arranged on the side wall of the guide column and fits with the wall surface of the big end of the connecting rod, and a fastening screw that fixes the guide column and the big end of the connecting rod.

[0010] The principles and effects of this basic solution are:

[0011] Compared with the prior art, the present invention drives the small end of the connecting rod to move by a hydraulic press, simulating the process in which the piston in the engine is driven by the air pressure to drive the connecting rod to move, thereby simulating the movement state of the connecting rod and simulating the various forces and stresses it is subjected to during engine operation, so as to verify its strength and reliability in actual use. In addition, the present invention can visually observe the movement process of the connecting rod during the detection process, and observe whether there is damage or cracks on the surface of the connecting rod after the simulation is completed. In addition, based on the characteristic that the big end of the connecting rod is severely worn during the movement of the connecting rod, the present invention adopts a ball bearing to cooperate the guide column with the big end of the connecting rod to reduce the damage to the connecting rod surface during the simulation process, thereby avoiding the problem of the connecting rod needing secondary processing after detection.

[0012] Furthermore, the second clamping assembly also includes a top cover detachably connected to the top of the guide column, and a ball bearing that fits the top surface of the connecting rod big end is also provided at the bottom of the top cover. The top cover facilitates the fixing of the connecting rod big end and the guide column to each other.

[0013] Furthermore, a lubricating oil passage is provided inside the guide post for filling lubricating liquid on the surface of the ball and the surface of the connecting rod big end, and the lubricating oil passage includes an oil cavity provided in the guide post, a first oil guide hole provided at the top of the guide post side wall and connected to the oil cavity, and a second oil guide hole provided on the guide post side wall and accommodating the installation of the ball, the second oil guide hole is connected to the oil cavity, and when the guide post and the connecting rod big end are matched, a gap is formed between the second oil guide hole and the ball. By filling lubricating oil, the wear of the connecting rod during the detection process can be further reduced.

[0014] Furthermore, the end of the second oil guide hole is provided with an arc surface adapted to the ball, and a spring is provided between the inner bottom surface of the second oil guide hole and the ball, and when the guide post is matched with the connecting rod big end, the spring is compressed. Through this arrangement, the lubricating oil can be accumulated in the second oil guide hole, and when the guide post is matched with the connecting rod big end, the ball and the spring are compressed to cause the lubricating oil to flow out.

[0015] Furthermore, the ball is also connected to a limiting column located in the second oil guide hole. When the guide column is matched with the connecting rod big end, the guide column is tightly fitted with the inner bottom surface of the second oil guide hole. The limiting column can limit the position of the ball movement to avoid a large gap between the ball and the connecting rod to affect the assembly progress.

[0016] Furthermore, an oil collecting pan located below the big end of the connecting rod is provided at the bottom of the guide column, and an oil return hole is connected between the inner bottom surface of the oil collecting pan and the oil cavity. The oil collecting pan collects lubricating oil and returns the oil to the oil cavity for collection.

[0017] Furthermore, the oil cavity is arranged along the circumference of the guide column, and an oil guide plate is arranged in the oil guide cavity, and the oil guide plate comprises a first connecting plate and a second connecting plate connected end to end in sequence, the first connecting plate is a horizontal plate, and the second connecting plate is an inclined plate, and the inclined direction of the inclined plate is the same as the rotation direction of the turntable. This arrangement enables the guide column to follow the turntable and rotate with the middle of the turntable as the center during the detection of the connecting rod, as the connecting rod drives the turntable to rotate, and the guide column rotates on the turntable with the middle of the turntable as the center, and during the rotation process, there are two states of acceleration and deceleration. During the acceleration process, the lubricating oil moves along the inclined plate, and during the deceleration process, the lubricating oil moves along the horizontal plate, thereby guiding the lubricating oil in the oil cavity upward, so that the lubricating oil flows to the surface of the connecting rod again through the first oil guide hole and the second oil guide hole.

[0018] Furthermore, the inner bottom surface of the oil collecting pan is also provided with a ball bearing in contact with the bottom of the connecting rod big end, so as to reduce the wear on the bottom of the connecting rod.

[0019] Furthermore, the first clamping assembly includes an ear seat matched with the connecting rod small end and a fixing stud for assembling the ear seat with the connecting rod small end, so as to fix the connecting rod small end.

[0020] Furthermore, the bottom of the ear seat is threadedly connected with a limit guide rod, and one side of the turntable is provided with an arc surface adapted to the limit guide rod. By adjusting the position of the limit guide rod, the hydraulic press can also be used to test the compressive performance of the connecting rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 A schematic diagram of a connecting rod strength testing device proposed in an embodiment of the present application is shown;

[0023] Figure 2 A partial structural schematic diagram of a connecting rod strength detection device proposed in an embodiment of the present application is shown;

[0024] Figure 3 A cross-sectional view of a second clamping assembly of a connecting rod strength testing device proposed in an embodiment of the present application is shown;

[0025] Figure 4 A schematic diagram of a first connecting plate and a second connecting plate of a connecting rod strength detection device proposed in an embodiment of the present application is shown;

[0026] Figure 5 A front view of a first connecting plate and a second connecting plate of a connecting rod strength detection device proposed in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0027] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation mode, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0028] The figure marks in the drawings of the specification include: test bench 1, connecting rod 2, hydraulic press 3, ear seat 4, top cover 5, turntable 6, limit ring 7, threaded seat 8, knob 9, limit guide rod 10, arc surface 11, fastening screw 12, middle ball 13, top ball 14, bottom ball 15, oil chamber 16, limit column 17, spring 18, oil guide plate 19, horizontal plate 1901, inclined plate 1902.

[0029] A connecting rod strength testing device, for example Figure 1 As shown: it includes a test bench 1, a hydraulic press 3 arranged on the test bench 1 and a turntable 6 rotatably connected to the test bench 1, wherein the piston rod output end of the hydraulic press 3 is provided with a first clamping assembly that can be clamped with the small end of the connecting rod 2, the first clamping assembly includes an ear seat 4 matched with the small end of the connecting rod 2, a sleeve detachably connected to the through hole of the ear seat 4 and a fixing stud assembling the sleeve, the ear seat 4 and the small end of the connecting rod 2, and a limiting ring 7 sleeved on the outer wall of the turntable 6 is provided on the test bench 1. The small end of the connecting rod 2 is driven to move by the hydraulic press 3 to simulate the process in which the piston in the engine is driven to move by the air pressure, thereby simulating the movement state of the connecting rod 2, simulating the various forces and stresses it is subjected to during the operation of the engine, so as to verify its strength and reliability in actual use.

[0030] The extension and retraction direction, pressure size, pressure application speed, duration, etc. of the hydraulic press 3 piston rod are adjusted through various control buttons on the control box connected to the hydraulic press signal, and are displayed digitally on the display screen.

[0031] like Figure 2As shown, a threaded seat 8 is provided at the bottom of the ear seat 4, and the threaded seat 8 is threadedly connected to a limiting guide rod 10. A knob 9 is provided at one end of the limiting guide rod 10. When the connecting rod 2 is located at the leftmost end of the turntable 6, an arc surface 11 adapted to the limiting guide rod 10 is provided on the right side of the position of the turntable 6. When the hydraulic press 3 drives the connecting rod 2 to move continuously, the position of the limiting guide rod 10 is adjusted so that the limiting guide rod 10 does not contact the arc surface 11; and when the connecting rod 2 is subjected to a compression test, the position of the limiting guide rod 10 is adjusted so that when the connecting rod 2 is located at the leftmost end of the turntable 6, the limiting guide rod 10 contacts the arc surface 11, thereby limiting the position of the turntable 6 and preventing the turntable 6 from rotating.

[0032] like Figure 3 As shown, a second clamping assembly that can clamp the big end of the connecting rod 2 is eccentrically connected to the top of the turntable 6, and the second clamping assembly includes a guide column arranged on the turntable 6 and can extend into the big end of the connecting rod 2, a top cover 5 detachably connected to the top of the guide column, an oil collecting pan arranged at the bottom of the guide column and located below the big end of the connecting rod 2, balls arranged on the side wall of the guide column, the lower surface of the top cover 5 and the bottom surface of the oil collecting pan and in contact with the wall surface of the big end of the connecting rod 2, and a fastening screw 12 that fixes the top cover 5, the guide column and the big end of the connecting rod 2.

[0033] The balls include a top ball 14 located between the lower surface of the top cover 5 and the upper surface of the connecting rod 2, a middle ball 13 located between the guide column and the inner wall of the large end through hole of the connecting rod 2, and a bottom ball 15 located between the inner bottom surface of the oil collecting pan and the lower surface of the connecting rod 2.

[0034] A lubricating oil passage is provided inside the guide column for filling lubricating liquid to the surface of the ball and the big end surface of the connecting rod 2. The lubricating oil passage includes an oil chamber 16 provided in the guide column, a first oil guide hole provided at the top of the guide column side wall and connected to the oil chamber 16, a second oil guide hole provided on the side wall of the guide column and accommodating the installation of the middle ball 13, and an oil return hole provided between the inner bottom surface of the oil collecting pan and the oil chamber 16. The second oil guide hole is connected to the oil chamber 16, and an arc surface matching the middle ball 13 is provided at the end of the second oil guide hole, a spring 18 is provided between the inner bottom surface of the second oil guide hole and the middle ball 13, and the middle ball 13 is also connected to a limit column 17 located in the second oil guide hole. When the guide column cooperates with the big end of the connecting rod 2, the spring 18 is compressed, the guide column fits tightly with the inner bottom surface of the second oil guide hole, and a gap is formed between the second oil guide hole and the middle ball 13.

[0035] like Figure 4 and Figure 5As shown, the oil chamber 16 is arranged along the inner circumference of the guide post, and an oil guide plate 19 is arranged in the oil guide chamber 16. The oil guide plate 19 includes a first connecting plate and a second connecting plate connected end to end in sequence. The first connecting plate is a horizontal plate 1901, and the second connecting plate is an inclined plate 1902. The inclined direction of the inclined plate 1902 is the same as the rotation direction of the turntable 6. During the detection of the connecting rod 2, since the connecting rod 2 drives the turntable 6 to rotate, the guide post follows the turntable 6 to rotate with the middle of the turntable 6 as the center of the circle, and during the rotation process, there are two states of acceleration and deceleration. During the acceleration process, the lubricating oil moves along the inclined plate 1902, and during the deceleration process, the lubricating oil moves along the horizontal plate 1901, so that the lubricating oil in the oil chamber 16 is guided upward, so that the lubricating oil flows to the surface of the connecting rod 2 again through the first oil guide hole and the second oil guide hole, so that the lubricating oil is used again.

[0036] The present invention drives the small end of the connecting rod 2 to move by the hydraulic press 3, simulating the process in which the piston in the engine is driven by the air pressure to drive the connecting rod 2 to move, thereby simulating the movement state of the connecting rod 2 and simulating the various forces and stresses it is subjected to during the operation of the engine, so as to verify its strength and reliability in actual use. In addition, the present invention can intuitively observe the movement process of the connecting rod 2 during the detection process, and observe whether there is damage or cracks on the surface of the connecting rod 2 after the simulation is completed. In addition, the present invention basically takes into account the characteristic that the big end of the connecting rod 2 is severely worn during the movement of the connecting rod 2, and adopts a ball to match the guide column with the big end of the connecting rod 2 to reduce the damage to the surface of the connecting rod 2 during the simulation process, thereby avoiding the problem that the connecting rod 2 needs to be processed again after detection.

[0037] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A connecting rod strength testing device, characterized in that: include: Testing bench; A hydraulic press arranged on the inspection platform, wherein the piston rod output end of the hydraulic press is provided with a first clamping assembly which can be clamped with the small end of the connecting rod; A turntable is rotatably connected to the detection table, and a second clamping assembly that can clamp the big end of the connecting rod is eccentrically connected to the top of the turntable. The second clamping assembly includes a guide column arranged on the turntable and can extend into the big end of the connecting rod, a ball arranged on the side wall of the guide column and fits with the wall surface of the big end of the connecting rod, and a fastening screw that fixes the guide column and the big end of the connecting rod.

2. A connecting rod strength testing device according to claim 1, characterized in that: The second clamping assembly also includes a top cover detachably connected to the top of the guide column, and a ball bearing that fits with the top surface of the connecting rod big end is also provided at the bottom of the top cover.

3. A connecting rod strength testing device according to claim 2, characterized in that: A lubricating oil passage is provided inside the guide column for filling lubricating liquid to the surface of the ball and the big end of the connecting rod. The lubricating oil passage includes an oil chamber provided in the guide column, a first oil guide hole provided at the top of the guide column side wall and connected to the oil chamber, and a second oil guide hole provided on the guide column side wall and accommodating the installation of the ball. The second oil guide hole is connected to the oil chamber. When the guide column is matched with the big end of the connecting rod, a gap is formed between the second oil guide hole and the ball.

4. A connecting rod strength testing device according to claim 3, characterized in that: The end of the second oil guide hole is provided with an arc surface adapted to the ball, and a spring is provided between the inner bottom surface of the second oil guide hole and the ball. When the guide column cooperates with the big end of the connecting rod, the spring is compressed.

5. A connecting rod strength testing device according to claim 4, characterized in that: The ball is also connected to a limiting column located in the second oil guide hole. When the guide column is matched with the big end of the connecting rod, the guide column is tightly fitted with the inner bottom surface of the second oil guide hole.

6. A connecting rod strength testing device according to any one of claims 3-5, characterized in that: An oil collecting pan located below the big end of the connecting rod is provided at the bottom of the guide column, and an oil return hole is connected between the inner bottom surface of the oil collecting pan and the oil cavity.

7. A connecting rod strength testing device according to claim 6, characterized in that: The oil chamber is arranged along the circumference of the guide column, and an oil guide plate is arranged in the oil guide chamber. The oil guide plate includes a first connecting plate and a second connecting plate which are connected end to end in sequence. The first connecting plate is a horizontal plate, and the second connecting plate is an inclined plate. The inclination direction of the inclined plate is the same as the rotation direction of the turntable.

8. A connecting rod strength testing device according to claim 6, characterized in that: The inner bottom surface of the oil collecting pan is also provided with a ball which contacts the bottom of the connecting rod big end.

9. The connecting rod strength testing device according to claim 1, characterized in that: The first clamping assembly includes an ear seat matched with the connecting rod small end and a fixing stud for assembling the ear seat and the connecting rod small end.

10. A connecting rod strength testing device according to claim 9, characterized in that: The bottom of the ear seat is threadedly connected to a limiting guide rod, and one side of the turntable is provided with an arc surface adapted to the limiting guide rod.

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