Metal tube fatigue test fixture and detection device

Abstract

The application relates to a metal pipe fatigue test clamp and detection device, which comprises a base, a pressing plate, a vibration transmission assembly and a detection device, wherein the pressing plate is arranged on the base, the pressing plate is provided with a loading hole, a metal pipe is inserted into the loading hole, and the upper end of the metal pipe is arranged outside the loading hole; one end of the vibration transmission assembly is connected with the upper end of the metal pipe, and the other end is connected with a vibration output assembly; the vibration output assembly transmits vibration to the metal pipe through the vibration transmission assembly; and a crack observation hole is arranged on the vibration transmission assembly and connected with the metal pipe. Compared with the prior art, the clamp has high positioning accuracy, can meet the positioning and clamping requirements, and makes each metal pipe arranged in an array have the same clamping degree; the vibration transmission path is formed by the metal pipe, a pressing arm and a pressing rod, so that the load applied to the test sample is stable and uniform; the detection array scale can be expanded according to actual test requirements, and large-scale industrial sample testing can be realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of industrial detection, in particular to a metal pipe fatigue test fixture and detection device. BACKGROUND

[0002] Metal pipe fittings have extremely wide industrial applications, and various mechanical properties are mainly evaluated, among which fatigue resistance is particularly important. Initial defects in raw materials may cause metal pipes to crack and fail during subsequent use, so it is necessary to test the fatigue durability of pipe materials to ensure the stability of product reliability and quality.

[0003] The current fatigue test tool on the market has the problems of difficult test pipe fitting assembly and disassembly, only one test at a time, long test process, and many repetitive operations during testing, making the current test efficiency low and the test cost high. On the other hand, the existing test device has the problem of unreasonable experimental boundary load, which makes the load applied to the test sample uneven, resulting in distortion of the final test results. SUMMARY

[0004] The purpose of the present application is to overcome the defects of the prior art and provide a metal pipe fatigue test fixture. Starting from the design of a fixture for large quantities of metal pipes and automation, a high-maintenance-efficiency crack fixture for metal pipes that can be used with a robot for automatic sample testing and a matching detection device are developed.

[0005] The purpose of the present application can be achieved by the following technical solutions:

[0006] The metal pipe fatigue test fixture protected in the present application comprises a base, a pressing plate, a vibration transmission assembly and a detection device, wherein specifically:

[0007] The pressing plate is arranged on the base, and a loading hole is formed in the pressing plate. The metal pipe is inserted into the loading hole, and the upper end of the metal pipe is arranged outside the loading hole.

[0008] One end of the vibration transmission assembly is connected to the upper end of the metal pipe, and the other end is connected to a vibration output assembly. The vibration output assembly transmits vibration to the metal pipe through the vibration transmission assembly. A crack observation hole is formed in the vibration transmission assembly at the connection position of the metal pipe.

[0009] Further, the vibration transmission assembly comprises a pressing arm, a pressing rod and a pressing disc, wherein specifically:

[0010] One end of the pressing arm is connected to the upper end of the metal pipe, and the crack observation hole is formed in the pressing arm at the connection position of the pressing arm and the metal pipe.

[0011] The lower end of the pressing rod is connected with the pressing arm;

[0012] The upper end of the pressing rod is connected with a pressing plate, and the upper surface of the pressing plate is connected with the vibration output assembly.

[0013] Further, the pressing rod is limitingly hinged to the pressing arm.

[0014] Further, a connecting groove is formed in one end of the pressing arm to which the pressing rod is hinged, and the inner diameter of the connecting groove is larger than the outer diameter of the pressing rod.

[0015] A pin shaft is arranged in the connecting groove, and the pin shaft penetrates the pressing rod and the pressing arm at the same time to form a limitingly hinged structure, that is, a small amount of relative rotation can be generated between the pressing rod and the pressing arm, and the relative rotation angle is ±10°.

[0016] Further, two rows of loading holes are symmetrically formed in the pressing plate, and the metal pipes are inserted into the two rows of loading holes.

[0017] Further, the pressing arm and the pressing rod are arranged in two rows and correspond to the metal pipes, and the metal pipes, the pressing arm and the pressing rod form a vibration transmission path with a front face of or type.

[0018] Further, the upper ends of the pressing rods are connected to the same pressing plate.

[0019] Further, an elastic expansion sleeve is arranged between the inner wall of the loading hole and the metal pipe, and a locking disc is arranged at the upper end of the elastic expansion sleeve to realize the fixed connection of the metal pipe in the loading hole.

[0020] Further, one side of the base is provided with a robot switching disc, and the robot switching disc is detachably connected with the mechanical arm of the robot in a manner of pneumatic connection, electromagnetic connection or mechanical buckle connection.

[0021] Further, the upper end of the metal pipe is connected with the pressing arm through the cooperation of the conical inner wall nut and the locking bolt.

[0022] Further, the metal pipe is a seat air spring metal pipe.

[0023] The metal pipe fatigue test device protected in the application comprises the metal pipe fatigue test clamp, the vibration output assembly, the industrial robot and the visual detection robot as claimed in the claims.

[0024] The industrial robot assembles the metal pipe fatigue test clamp with the metal pipes, and the visual detection robot is provided with a camera module which can obtain the crack information of the metal pipe in real time through the crack observation hole.

[0025] Compared with the prior art, the present application has the following technical advantages:

[0026] 1) The fixture positioning precision is high, can meet the positioning and clamping requirements, so that each metal pipe arranged in an array has the same clamping degree, and the vibration transmission path formed by the metal pipe, the pressure arm and the pressure rod is of a type or type, so that the load applied to the test sample is stable and uniform.

[0027] 2) The structure is simple, thereby reducing the manufacturing and procurement costs, and the detection array scale can be expanded according to actual test requirements to realize large-scale industrial sample testing.

[0028] 3) The operation is simple and convenient, and all installation and disassembly processes can be completed by an industrial robot with a mechanical arm, so that the robot automatic feeding and discharging can be realized, the work is reliable and stable, the manual operation intensity is significantly reduced, and mechanical automation is realized. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 is a schematic structural diagram of a metal pipe fatigue test fixture in the present application;

[0030] Figure 2 is a schematic structural diagram of a cross-section of the metal pipe fatigue test fixture in the present application.

[0031] In the figure: 1, base, 2, pin shaft, 3, pressure plate, 4, metal pipe, 5, pressure arm, 6, pressure rod, 7, pressure disc, 8, butt flange, 9, locking mechanism, 10, pressure rod locking nut, 11, locking bolt, 12, jackscrew bolt, 13, locking bolt, 14, robot switching disc, 15, elastic expansion sleeve, 16, locking disc, 17, conical inner wall nut. DETAILED DESCRIPTION

[0032] The present application will be described in detail below in combination with the drawings and specific embodiments.

[0033] Embodiment 1

[0034] The metal pipe fatigue test fixture protected in the present application comprises a base 1, a pressure plate 3, a vibration transmission assembly and a detection device, as shown in Figure 1 .

[0035] The pressure plate 3 is arranged on the base 1, and a loading hole 31 is formed in the pressure plate 3, the metal pipe 4 is inserted into the loading hole 31, and the upper end of the metal pipe 4 is arranged outside the loading hole 31.

[0036] The one end of the vibration transmission assembly is connected with the upper end of the metal pipe 4, and the other end is connected with the vibration output assembly, the vibration output assembly transmits vibration to the metal pipe 4 through the vibration transmission assembly, and the crack observation hole 51 is arranged at the position where the vibration transmission assembly is connected with the metal pipe 4. The vibration transmission assembly comprises a pressing arm 5, a pressing rod 6 and a pressing disc 7, see Figure 1 , wherein the one end of the pressing arm 5 is connected with the upper end of the metal pipe 4, the crack observation hole 51 is arranged on the pressing arm 5 and at the position where the pressing arm 5 is connected with the metal pipe 4, the lower end of the pressing rod 6 is connected with the pressing arm 5, the pressing disc 7 is connected with the upper end of the pressing rod 6, and the upper surface of the pressing disc 7 is connected with the vibration output assembly. The pressing rod 6 is limitingly hinged on the pressing arm 5, so that the torque load is generated at the position where the pressing arm 5 is connected with the metal pipe 4 through the vibration energy, and the simulation of the load of the metal pipe 4 in reality is realized.

[0037] The end of the pressing arm 5 and the pressing rod 6 is provided with a connecting groove 52, and the inner diameter of the connecting groove 52 is greater than the outer diameter of the pressing rod 6. The pin shaft 2 is arranged in the connecting groove 52 and penetrates the pressing rod 6 and the pressing arm 5 at the same time, so as to form a limitingly hinged structure. That is, a small amount of relative rotation can be generated between the pressing rod 6 and the pressing arm 5, and the relative rotation angle is ±10°.

[0038] Two rows of loading holes 31 are symmetrically arranged on the pressing plate 3, and the metal pipes 4 are inserted into the two rows of loading holes 31. The pressing arm 5 and the pressing rod 6 are arranged in two rows and correspond to the metal pipes 4, and the metal pipes 4, the pressing arm 5 and the pressing rod 6 form a vibration transmission path with a front surface of or type. The upper ends of the pressing rods 6 are connected to the same pressing disc 7, so as to realize uniform distribution of vibration. The elastic expansion sleeve 15 is further arranged between the inner wall of the loading hole 31 and the metal pipe 4, see Figure 2 , the upper end of the elastic expansion sleeve 15 is sleeved with the locking disc 16, so as to realize the fixed connection of the metal pipe 4 in the loading hole 31. The upper end of the metal pipe 4 is connected with the pressing arm 5 through the cooperation of the conical inner wall nut 17 and the locking bolt 11. Specifically, in the test, the metal pipe 4 is a seat air spring metal pipe to be tested.

[0039] One side of the base 1 is provided with a robot switching disc 14. The robot switching disc 14 is detachably connected with the mechanical arm of the robot, and the connection mode can be pneumatic connection, electromagnetic connection, mechanical lock connection and the like.

[0040] The metal pipe fatigue testing device protected in the embodiment includes the metal pipe fatigue testing fixture, the vibration output assembly, the industrial robot and the visual detection robot mentioned in the claims. The industrial robot assembles multiple metal pipes 4 to the metal pipe fatigue testing fixture, and the visual detection robot is provided with a camera module which obtains crack information of the metal pipe 4 in real time through the crack observation hole 51. In specific use, the output flange of the hydraulic cylinder is connected with the butt flange 8, and the locking mechanism 9 is connected. The specific mechanism 9 can be an electric lock, a pneumatic lock or the like. The vibration is first transmitted to the pressure plate 7, so that the pressure rod 6 vibrates vertically and is uniformly distributed downward through the pressure plate 7. The industrial robot automatically grabs multiple metal pipes 4 and puts them into the corresponding holes of the pressure plate 3, and then the elastic expansion sleeve 15 is loaded, and the locking disc 16 is clamped in the mechanical arm to lock multiple locking bolts 13. The industrial robot grabs the upper clamp composed of the pressure arm 5, the pressure rod 6 and the pressure plate 7 from the upper workbench and puts it into the corresponding position of the lower clamp. The robot takes the locking bolt 11 and the conical inner wall nut 17 to lock the metal pipe 4, applies an alternating load with a certain frequency to the hydraulic oil cylinder connected to the upper clamp, and the visual robot detects the crack through the two holes on the side of the pressure arm 5.

[0041] The above description of the embodiments is for the purpose of enabling a person of ordinary skill in the art to understand and use the invention. Those skilled in the art can easily make various modifications to the embodiments and apply the general principles described herein to other embodiments without creative labor. Therefore, the present invention is not limited to the above embodiments, and improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the scope of the present invention.

Claims

1. A fatigue testing fixture for metal tubes, characterized in that, include: Base (1); A pressure plate (3) is provided on the base (1). A loading hole (31) is provided on the pressure plate (3). A metal tube (4) is inserted into the loading hole (31) and the upper end of the metal tube (4) is placed outside the loading hole (31). The vibration transmission component has one end connected to the upper end of the metal tube (4) and the other end connected to the vibration output component. The vibration output component transmits vibration to the metal tube (4) through the vibration transmission component. A crack observation hole (51) is provided at the connection position between the vibration transmission component and the metal tube (4). The vibration transmission component includes: A pressure arm (5) is connected at one end to the upper end of the metal tube (4), and a crack observation hole (51) is opened on the pressure arm (5) and located at the connection between the pressure arm (5) and the metal tube (4). The lower end of the pressure rod (6) is connected to the pressure arm (5); The pressure plate (7) is connected to the upper end of the pressure rod (6), and the upper surface of the pressure plate (7) is connected to the vibration output assembly; The pressure rod (6) is hinged to the pressure arm (5) in a limiting manner; The pressure plate (3) has two rows of loading holes (31) symmetrically opened, and the metal tube (4) is inserted into the two rows of loading holes (31) in two rows; The pressure arms (5) and pressure rods (6) are arranged in two rows and correspond to the metal tube (4). The metal tube (4), pressure arms (5), and pressure rods (6) form the front side. type or A vibration transmission path of type [type].

2. The metal tube fatigue testing fixture according to claim 1, characterized in that, The end of the pressure arm (5) that is hinged to the pressure rod (6) is provided with a connecting groove (52), the inner diameter of the connecting groove (52) being larger than the outer diameter of the pressure rod (6); The connecting groove (52) is provided with a pin (2), which passes through both the pressure rod (6) and the pressure arm (5) to form a limiting hinge.

3. A metal tube fatigue testing fixture according to claim 1, characterized in that, The upper ends of the pressure rods (6) are all connected to the same pressure plate (7).

4. A metal tube fatigue testing fixture according to claim 1, characterized in that, An elastic expansion sleeve (15) is provided between the inner wall of the loading hole (31) and the metal tube (4). A locking disc (16) is fitted on the upper end of the elastic expansion sleeve (15) to achieve a fixed connection of the metal tube (4) in the loading hole (31).

5. A metal tube fatigue testing fixture according to claim 1, characterized in that, A robot switching disk (14) is provided on one side of the base (1).

6. A fatigue testing device for metal tubes, characterized in that, Includes the metal tube fatigue testing fixture as described in any one of claims 1 to 5, as well as the vibration output assembly, industrial robot, and vision inspection robot; The industrial robot assembles multiple metal tubes (4) with a metal tube fatigue testing fixture. The vision inspection robot is equipped with a camera module, which obtains crack information of the metal tubes (4) in real time through the crack observation hole (51).

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