A space pipeline system metal bellows pulling and pressing test device

Abstract

The utility model relates to corrugated pipe test technical field, concretely to a kind of aerospace pipeline system metal bellows tension and compression test device, including testing machine base, vertical installation is equipped with pressure testing machine column on the testing machine base, crossbeam is equipped on the pressure testing machine column, and with the testing machine column form movable connection, the top surface center position of the testing machine base is stipulated to be equipped with hydraulic lower chuck, the detachable first hydraulic clamp is connected to the top of the hydraulic lower chuck, the first pin is penetrated in the first hydraulic clamp. The utility model can simultaneously satisfy the axial stiffness and fatigue test demand of metal bellows, without replacing device for different performance test, substantially reduce the test cycle of sample piece, solve the problem that stiffness and fatigue test need to be carried out separately in traditional device, disassembled multiple times.

Description

Technical Field

[0001] This utility model relates to the field of corrugated pipe testing technology, specifically a tensile and compressive testing device for metal corrugated pipes in aerospace pipeline systems. Background Technology

[0002] Metal bellows are widely used in piping systems in modern industries such as aerospace, petrochemicals, and power generation to compensate for displacements caused by assembly errors, thermal deformation, and vibration, ensuring the reliability of pipe connection structures. After the design of a metal bellows is completed, prototypes need to be tested to verify performance indicators and ensure its safety and reliability. Its main technical performance indicators include stiffness and fatigue. Existing testing equipment is mostly designed for stiffness and fatigue testing of large-diameter metal bellows, and stiffness testing equipment is often used for radial stiffness testing. Stiffness and fatigue testing often use different testing equipment, requiring multiple disassembly and reassembly of the testing equipment during performance indicator verification tests, increasing the testing cycle of the prototypes.

[0003] Therefore, we propose a tensile and compressive testing device for metal corrugated pipes in aerospace piping systems. Utility Model Content

[0004] The purpose of this invention is to provide a tensile and compressive testing device for metal corrugated pipes in aerospace piping systems, which solves the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a tensile and compressive testing device for metal corrugated pipes in aerospace piping systems, comprising a testing machine base, a testing machine column vertically mounted on the testing machine base, a crossbeam sleeved on the testing machine column and movably connected to the testing machine column, a hydraulic lower chuck specifically installed at the center of the top surface of the testing machine base, a first hydraulic clamp detachably connected to the top of the hydraulic lower chuck, and a first pin penetrating the first hydraulic clamp;

[0006] A hydraulic upper chuck is fixed to the bottom surface of the crossbeam, and the hydraulic upper chuck and the hydraulic lower chuck are vertically aligned. A second hydraulic clamp is detachably connected to the bottom of the hydraulic upper chuck, and a second pin passes through the second hydraulic clamp.

[0007] A tension / compression testing fixture, the upper and lower ends of which are respectively inserted into the interiors of the first hydraulic clamp and the second hydraulic clamp.

[0008] By adopting the above technical solution, the main frame of the device is built through the fixed relationship between the testing machine column and the testing machine base. The crossbeam moves along the testing machine column to provide stroke for tensile and compressive actions. The detachable connection between the hydraulic chuck and the fixture facilitates the replacement and adaptation of different tooling. The wedge block and the locking nut can clamp the fixture to prevent loosening during the test. The pins further fix the tooling and fixture to ensure the tooling is aligned. The overall structure can stably bear the tensile and compressive test forces, providing basic support for subsequent axial stiffness and fatigue tests. At the same time, the detachable design improves the versatility of the device.

[0009] In a preferred embodiment of this utility model, the tensile and compressive testing fixture includes a clamping end, a first flange connector, a second flange connector, bolts, nuts, and a metal bellows. The two ends of the metal bellows are respectively fitted to the two first flange connectors. The bolts pass through the first flange connectors, the metal bellows, and the second flange connector in sequence and are threadedly locked to the nuts. The inner sidewall of the clamping end is provided with internal threads and is threadedly connected to the outer sidewall of the first flange connector.

[0010] By adopting the above technical solution, the first and second flange connectors are connected by bolts that are evenly distributed around the circumference, so that the two components are subjected to uniform force and local stress concentration is avoided; the design of at least 4 bolts can ensure the connection strength and prevent the two flanges from separating during the test. After connection, they are connected to the hydraulic upper clamp and the hydraulic lower clamp, and then a tension or compression test can be carried out.

[0011] In a preferred embodiment of this utility model, both the lower hydraulic chuck and the upper hydraulic chuck are provided with annular slots, and both the first hydraulic clamp and the second hydraulic clamp are provided with annular blocks that are adapted to the annular slots. The first hydraulic clamp and the second hydraulic clamp are detachably connected by inserting the annular blocks into the corresponding annular slots.

[0012] By adopting the above technical solution, the hydraulic fixture and chuck can be quickly assembled and disassembled using the interlocking structure of the annular groove and the chuck. The upper and lower chucks adopt the same groove structure to ensure the coaxiality of the upper and lower fixtures after installation and avoid tooling offset. This connection method can complete the fixture replacement without additional tools, which greatly shortens the device adjustment time under different test conditions. At the same time, the interlocking structure can withstand a certain radial force to prevent the fixture from shifting laterally during the test and improve the test stability.

[0013] In a preferred embodiment of this utility model, the outer wall of the clamping end of the tension and compression test fixture is provided with a pin hole. The two clamping ends are respectively inserted into the first hydraulic clamp and the second hydraulic clamp. The side wall of the first hydraulic clamp and the side wall of the second hydraulic clamp are both provided with through holes adapted to the pin holes. The first pin and the second pin respectively pass through the two clamping ends. The two clamping sections are respectively threaded with a first clamping nut and a second clamping nut. The two ends are fixed to prevent detachment by the first pin and the second pin.

[0014] By adopting the above technical solution, the pin passes through the hole structure of the fixture and the clamping end, directly restricting the relative movement of the tooling and the fixture. The cotter pin prevents the pin from falling off during test vibration or stress. The compatibility between the pin hole and the through hole ensures that the tooling is aligned after the pin is installed. This structure can further enhance the connection stability between the tooling and the fixture on the basis of the wedge block and the locking nut, avoiding axial movement or radial displacement of the tooling during tensile and compressive tests, ensuring that the test force is accurately applied to the metal bellows, and improving the reliability of the test data.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0016] The technical solution of this application provides a tensile and compressive testing device for metal bellows in aerospace piping systems, which can simultaneously meet the axial stiffness and fatigue testing requirements of metal bellows. It eliminates the need to change devices for different performance tests, significantly reduces the testing cycle of samples, and solves the problem of separate stiffness and fatigue tests and multiple disassembly and assembly in traditional devices.

[0017] It can be adapted to metal bellows of various diameters, breaking the limitation of traditional test devices that are mostly designed for large-diameter bellows, and improving the versatility of the equipment.

[0018] The test fixture is designed to be detachable and continuously usable. The disassembly and assembly operations are simple and convenient, which not only reduces the time cost of test preparation and completion, but also reduces the wear and tear of the fixture. At the same time, through hydraulic control and precise centering design, it ensures that the fixture does not loosen during the test, which significantly improves the test efficiency and data accuracy. Attached Figure Description

[0019] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0020] Figure 1 This is a schematic diagram of the overall structure of a metal corrugated pipe tension and compression test device for aerospace piping systems according to the present invention;

[0021] Figure 2 This is a schematic diagram of the tension and compression tooling structure of a tension and compression testing device for aerospace pipeline systems using metal corrugated pipes.

[0022] Figure 3 This is a schematic diagram of the disassembled tensile and compressive testing fixture of a metal corrugated pipe for aerospace piping systems according to the present invention.

[0023] Figure 4 This is a schematic diagram of the tooling clamping structure of a tensile and compressive testing device for aerospace pipeline systems using metal corrugated pipes.

[0024] Figure 5 This is a schematic diagram of the flange connection structure of a metal bellows tension and compression test device for an aerospace pipeline system according to the present invention.

[0025] In the picture:

[0026] 1. Testing machine base; 2. Testing machine column; 3. Hydraulic lower chuck; 4. First pin; 5. First hydraulic clamp; 6. First locking nut; 7. Tensile and compressive testing fixture; 8. Second locking nut; 9. Second pin; 10. Second hydraulic clamp; 11. Hydraulic upper chuck; 12. Crossbeam;

[0027] 7-1 Clamping end; 7-2 First flange connector; 7-3 Second flange connector; 7-4 Bolt; 7-5 Nut; 7-6 Metal bellows. Detailed Implementation

[0028] Please see Figure 1-5 This utility model provides a technical solution: a tensile and compressive testing device for metal corrugated pipes in aerospace pipeline systems, including a testing machine base 1, a testing machine column 2 vertically installed on the testing machine base 1, a crossbeam 12 sleeved on the testing machine column 2 and movably connected to the testing machine column 2, a hydraulic lower chuck 3 is installed at the center of the top surface of the testing machine base 1, a first hydraulic clamp 5 is detachably connected to the top of the hydraulic lower chuck 3, and a first pin 4 passes through the first hydraulic clamp 5;

[0029] The hydraulic upper chuck 11 is fixed to the bottom surface of the crossbeam 12, and the hydraulic upper chuck 11 and the hydraulic lower chuck 3 are vertically aligned. The bottom of the hydraulic upper chuck 11 is detachably connected to a second hydraulic clamp 10, and a second pin 9 passes through the second hydraulic clamp 10.

[0030] The tension and compression test fixture 7 is inserted into the first hydraulic clamp 5 and the second hydraulic clamp 10 at its upper and lower ends, respectively.

[0031] It should be understood that the main frame of the device is constructed by the fixed relationship between the testing machine column 2 and the testing machine base 1. The crossbeam 12 moves along the testing machine column 2 to provide stroke for tensile and compressive actions. The detachable connection between the hydraulic chuck and the fixture facilitates the replacement and adaptation of different tooling. The wedge block and the locking nut can clamp the fixture to prevent loosening during the test. The overall structure can stably bear the tensile and compressive test forces, providing basic support for subsequent axial stiffness and fatigue tests. At the same time, the detachable design improves the versatility of the device.

[0032] like Figure 1 and 2 As shown; the tensile and compressive testing fixture 7 includes a clamping end 7-1, a first flange connector 7-2, a second flange connector 7-3, bolts 7-4, nuts 7-5, and a metal bellows 7-6; the two ends of the metal bellows 7-6 are respectively fitted to the two first flange connectors 7-2, and the bolts 7-4 pass through the first flange connectors 7-2, the metal bellows 7-6, and the second flange connectors 7-3 in sequence and are threadedly locked to the nuts 7-5. The inner side wall of the clamping end 7-1 is provided with internal threads and is threadedly connected to the outer side thread of the first flange connector 7-2.

[0033] It should be understood that in actual use, the first and second flange connectors are connected by bolts that are evenly distributed around the circumference, so that the two parts are subjected to uniform force and local stress concentration is avoided; the design of at least 4 bolts can ensure the connection strength and prevent the two flanges from separating during the test. After connection, they are connected to the hydraulic upper clamp 11 and the hydraulic lower clamp 3, and then a tension or compression test can be performed.

[0034] like Figure 1 and 2 As shown; both the hydraulic lower chuck 3 and the hydraulic upper chuck 11 are provided with annular slots, and both the first hydraulic clamp 5 and the second hydraulic clamp 10 are provided with annular blocks that are adapted to the annular slots. The first hydraulic clamp 5 and the second hydraulic clamp 10 are detachably connected by inserting the annular blocks into the corresponding annular slots.

[0035] It should be understood that the interlocking structure of the annular groove and the clamp block enables the rapid assembly and disassembly of the hydraulic fixture and the chuck. The upper and lower chucks adopt the same groove structure to ensure the coaxiality of the upper and lower fixtures after installation and to avoid tooling misalignment. This connection method can complete the fixture replacement without additional tools, which greatly shortens the device adjustment time under different test conditions. At the same time, the interlocking structure can withstand a certain radial force to prevent the fixture from shifting laterally during the test and improve the test stability.

[0036] like Figure 1 and 2As shown; the clamping end 7-1 of the tensile and compressive testing fixture 7 has a pin hole on its outer side wall. The two clamping ends 7-1 are respectively inserted into the first hydraulic fixture 5 and the second hydraulic fixture 10. The side walls of the first hydraulic fixture 5 and the second hydraulic fixture 10 are both provided with through holes that are adapted to the pin holes. The first pin 4 and the second pin 9 pass through the two clamping ends 7-1 respectively. The two clamping sections 7-1 are respectively threaded with the first clamping nut 6 and the second clamping nut 8. The two ends are fixed to prevent detachment by the first pin 4 and the second pin 9.

[0037] It should be understood that the hole structure of the first pin 4 and the second pin 9 penetrating the fixture and the clamping end 7-1 directly restricts the relative movement of the tooling and the fixture, and the connection between the outer end of the pin and the nut prevents the pin from falling off during test vibration or stress; the compatibility between the pin hole and the through hole ensures that the tooling is aligned after the pin is installed. This structure, together with the locking nut, can further enhance the connection stability between the tooling and the fixture, avoid axial movement or radial displacement of the tooling during tensile and compressive tests, ensure that the test force is accurately applied to the metal bellows, and improve the reliability of the test data.

[0038] Furthermore, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0039] Although specific embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to the specific embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A tensile and compressive testing device for metal corrugated pipes in aerospace piping systems, characterized in that: The test machine includes a test machine base (1), on which a test machine column (2) is vertically mounted. A crossbeam (12) is fitted on the test machine column (2) and is movably connected to the test machine column (2). A hydraulic lower chuck (3) is installed at the center of the top surface of the test machine base (1). A first hydraulic clamp (5) is detachably connected to the top of the hydraulic lower chuck (3). A first pin (4) passes through the first hydraulic clamp (5). A hydraulic upper chuck (11) is fixed to the bottom surface of the crossbeam (12), and the hydraulic upper chuck (11) and the hydraulic lower chuck (3) are aligned vertically. A second hydraulic clamp (10) is detachably connected to the bottom of the hydraulic upper chuck (11), and a second pin (9) passes through the second hydraulic clamp (10). The tension and compression test fixture (7) is inserted into the interior of the first hydraulic clamp (5) and the second hydraulic clamp (10) at its upper and lower ends respectively.

2. The tensile and compressive testing device for aerospace piping systems according to claim 1, characterized in that: The tensile and compressive testing fixture (7) includes a clamping end (7-1), a first flange connector (7-2), a second flange connector (7-3), a bolt (7-4), a nut (7-5), and a metal bellows (7-6). The two ends of the metal bellows (7-6) are respectively fitted to the two first flange connectors (7-2). The bolt (7-4) passes through the first flange connector (7-2), the metal bellows (7-6), and the second flange connector (7-3) in sequence and is threadedly locked to the nut (7-5). The inner wall of the clamping end (7-1) is provided with an internal thread and is threadedly connected to the outer wall of the first flange connector (7-2).

3. The tensile and compressive testing device for aerospace piping systems according to claim 1, characterized in that: Both the hydraulic lower chuck (3) and the hydraulic upper chuck (11) are provided with annular slots. Both the first hydraulic clamp (5) and the second hydraulic clamp (10) are provided with annular blocks that are adapted to the annular slots. The first hydraulic clamp (5) and the second hydraulic clamp (10) are detachably connected by inserting the annular blocks into the corresponding annular slots.

4. The tensile and compressive testing device for aerospace piping systems according to claim 2, characterized in that: The clamping end (7-1) of the tensile and compressive testing fixture (7) has a pin hole on its outer side wall. The two clamping ends (7-1) are respectively inserted into the first hydraulic fixture (5) and the second hydraulic fixture (10). The side walls of the first hydraulic fixture (5) and the second hydraulic fixture (10) are respectively provided with through holes that are adapted to the pin holes. The first pin (4) and the second pin (9) pass through the two clamping ends (7-1) respectively. The outer walls of the two clamping ends (7-1) are respectively threaded with the first clamping nut (6) and the second clamping nut (8). The two ends are fixed to prevent detachment by the first pin (4) and the second pin (9).

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