A measuring device and testing method for tensile and compressive properties of underwater instruments

Abstract

The present invention belongs to the technical field of force measurement and metering, and relates to a measuring device and a testing method for the tensile and pressure resistance performance of underwater instruments and equipment. A measuring device for the tensile and pressure resistance performance of underwater instruments, comprising two load-bearing screws; upper end covers and lower end covers are installed at both ends of the load-bearing screws; a mounting assembly for connecting the instrument to be tested is provided between the upper end cover and the lower end cover; the mounting assembly is connected to a force sensor. The measuring device and the testing method for the tensile and pressure resistance performance of underwater instruments of the present invention can realize the testing tasks of underwater instruments and equipment in both pressure resistance and tensile state, and test the working performance of underwater instruments in real tensile and pressure resistance working state. In addition, the measuring device of the present invention has a simple and compact structure, and can be placed as a whole in a high-pressure tank under the tensile load-keeping state, which meets the size requirements of the existing pressure-testing device for the equipment to be tested.

Description

Technical Field

[0001] The present invention belongs to the technical field of force measurement and metering, and relates to a measuring device and a testing method for the tensile and compressive properties of underwater instruments and equipment. Background Art

[0002] With the development of underwater resources and the exploration of underwater environments, especially in deep environments such as the ocean, the research and development and use of various underwater instruments and equipment are becoming more and more common. In the process of research and development of underwater instruments and equipment, the pressure resistance and tensile performance of various underwater instruments and equipment are two very important indicators for whether underwater instruments and equipment can work normally underwater, and both often need to coexist and need to meet work requirements at the same time. Therefore, in the process of research and development of underwater instruments and equipment, the pressure resistance and tensile resistance of the equipment need to be carefully considered. In the prior art, the tensile capacity of underwater instruments and equipment under large tensile conditions can be tested by a tensile testing machine, and the pressure resistance of underwater instruments and equipment under large pressure conditions can also be tested by equipment such as a pressure tank.

[0003] At present, most underwater instruments are tested for tensile and pressure resistance reliability performance by using a tensile testing machine or a pressure tank to test a single parameter of tension or pressure, or by directly dropping the underwater instruments and equipment into the target sea area for testing, which results in a relatively high testing cost. In addition, for the actual working conditions of underwater instruments and equipment, the equipment needs to be tensile while being pressure-resistant. From the perspective of the instrument designer or user, how to truly and accurately obtain the working reliability of the instrument under actual working conditions has become a problem that must be solved. Under existing technical conditions, there is no effective testing device and method that can simultaneously test the working performance of underwater equipment under pressure and tensile conditions.

[0004] It is difficult to simultaneously achieve the tension environment and pressure environment of underwater instruments and equipment in their actual working state underwater, especially at great depths and large load conditions. The pressure value will reach tens of MPa and the tension value will reach several tons. At this time, the feasibility of the high-pressure and high-tension indicators of the test device will be highly required. Improvement or research and development based on the existing high-water pressure testing device or large-scale tensile testing machine will greatly increase the testing cost.

[0005] Therefore, it is necessary to design a universal tensile and pressure test device and test method for different types of underwater instruments. Summary of the invention

[0006] The purpose of the present invention is to solve the technical problem that the pressure resistance and tensile resistance of underwater instruments and equipment cannot be tested simultaneously in the prior art, and to provide a measuring device and a testing method for the tensile and pressure resistance performance of underwater instruments, so as to test the working stability and reliability of underwater instruments and equipment under the condition of truly simulating the working state of underwater instruments and equipment.

[0007] The technical solution adopted by the present invention to solve its technical problem is: a measuring device for the tensile and compressive performance of underwater instruments, comprising two load-bearing screws; upper end covers and lower end covers are installed at both ends of the load-bearing screws; an installation component for connecting the instrument to be measured is provided between the upper end cover and the lower end cover; the installation component is connected to a force sensor.

[0008] As a further improvement of the present invention, the installation assembly includes a pin hole arranged on the lower surface of the upper end cover, an upper connecting bolt, a lower connecting bolt fixed to the upper surface of the lower end cover, and a shackle.

[0009] As a further improvement of the present invention, the upper and lower sides of the upper end cover or the lower end cover are fixed by nuts respectively.

[0010] As a further improvement of the present invention, the upper end cover and the lower end cover are provided with connecting components for connecting the tensile testing machine.

[0011] As a further improvement of the present invention, a reinforcing rib plate is provided on the upper end cover or the lower end cover.

[0012] In order to achieve the purpose of the present invention, the present invention also provides a method for testing the tensile and compressive properties of an underwater instrument, comprising:

[0013] After the instrument to be tested is installed on the test device, the device is subjected to tensile loading using a tensile testing machine, and the tensile loading value is monitored in real time through a force sensor connected to the device;

[0014] After the tension reaches a predetermined value, the nuts on the upper and lower sides of the upper end cover are tightened to maintain the tension.

[0015] After being disassembled from the tensile testing machine, the change of tensile force value is monitored in real time through the force sensor on the device;

[0016] After confirming that the tensile force meets the test requirements under the load-maintaining state, the entire device is placed in a pressure-bearing device for a pressure test.

[0017] As a further improvement of the present invention, the tensile load holding time of the tensile test is 48 hours or is set according to the tensile test requirements.

[0018] As a further improvement of the present invention, the test time of the pressure test is 48 hours or is set according to the pressure test requirements.

[0019] As a further improvement of the present invention, during the pressure resistance test, the execution action monitoring of the instrument to be tested and the output signal of the force sensor can be output to the outside of the tank through the watertight plug in the high-pressure tank for real-time monitoring, and the posture of the instrument to be tested is monitored by an underwater camera in the tank.

[0020] Compared with the prior art, the measuring device and testing method for the tensile and compressive properties of underwater instruments of the present invention have the following beneficial effects:

[0021] 1. It can realize the simultaneous testing of tensile and pressure resistance of underwater instruments, and can simulate the underwater working environment of the ocean more realistically.

[0022] 2. The structure is compact and the overall shape is slender, which can meet the shape requirements of existing tensile testing machines and high-pressure tanks for measuring specimens.

[0023] 3. High strength, can meet the requirements of high pressure resistance and high tension resistance under tens of MPa pressure and several tons of tension, suitable for environmental reliability testing of deep-sea underwater instruments.

[0024] 4. The tensile load holding test can be carried out alone, and the pressure bearing and pressure resistance dual working condition test can also be carried out. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 The present invention is a schematic structural diagram of a device for measuring the tensile and compressive properties of underwater instruments according to an embodiment of the present invention. DETAILED DESCRIPTION

[0026] In order to facilitate the understanding of the present invention, the present invention is described in more detail below in conjunction with the accompanying drawings and specific embodiments. Preferred embodiments of the present invention are provided in the accompanying drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described in this specification. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0027] The measuring device for the tensile and compressive properties of underwater instruments of the present invention is as follows: Figure 1 As shown, it mainly consists of two load-bearing screw rods 6, an upper end cover 2, a lower end cover 9, and a force sensor 10. The upper end cover 2 and the lower end cover 9 are respectively mounted on the two ends of the two screw rods 6, and are fixed with nuts 3 on the upper and lower sides of the upper end cover 2 and the lower end cover 9. A mounting assembly for connecting the instrument to be tested is provided between the upper end cover 2 and the lower end cover 9, including a pin hole provided on the lower surface of the upper end cover 2, an upper connecting bolt 4, a lower connecting bolt 8 and a shackle 7. The lower part of the lower connecting bolt 8 is a threaded column, and the upper end of the threaded column is a connecting ring. The lower connecting bolt 8 is threadedly connected to the lower end cover 9, and the force sensor 10 is fixed to the upper surface of the lower end cover 9.

[0028] In some embodiments of the present invention, in order to facilitate the connection of the tensile testing machine, it is necessary to set connecting components on the upper end cover and the lower end cover. The preferred solution is to respectively set an upper pull ring 1 and a lower pull ring 11 on the upper surface of the upper end cover 2 and the lower surface of the lower end cover 9. During the test, the tensile testing machine is respectively connected and fixed to the upper pull ring 1 and the lower pull ring 11 to load the device with tension.

[0029] In some embodiments of the present invention, in order to meet the instrument load-holding performance requirements under several tons of tension, a cross reinforcing rib plate 12 is provided on the upper surface of the upper end cover 2 and a parallel reinforcing rib plate 13 is provided on the upper surface of the lower end cover 9.

[0030] The main force-bearing components of the device of the embodiment of the present invention are eight nuts 3, two bearing screws 6, and an upper end cover 2 and a lower end cover 9. According to the requirements of the tensile performance of different types of underwater equipment, the test range of the device can be adjusted by replacing the bearing screws 6 and nuts 3.

[0031] Another embodiment of the present invention provides a method for testing the tensile and compressive properties of an underwater instrument, and the specific steps are as follows:

[0032] First, connect the underwater instrument 5 to the pin hole on the upper top cover 2 through the upper connecting bolt 4, and at the same time connect the upper section of the load-bearing screw 6 to the upper end cover 2 through four positioning force nuts 3, connect the lower end of the underwater instrument 5 to the lower connecting bolt 8 through the shackle 7, and then connect the lower connecting bolt 8, the force sensor 10 and the upper end cover 9, fix the force sensor 10 on the lower end cover 9 through the threaded connection between the lower connecting bolt 8 and the lower end cover, and connect the lower section of the load-bearing screw 6 to the lower end cover 9 through four positioning force nuts 3.

[0033] After assembly, the entire device is connected to the tensile testing machine through the upper lifting ring 1 and the lower lifting ring 11. At the same time, the four positioning force nuts 3 at the lower section of the load-bearing screw rod 6 are reinforced and tightened, and the four positioning force nuts 3 at the upper section remain in a loose state, and a certain distance is maintained between the nuts on the upper and lower sides and the upper end cover 2.

[0034] Use a tensile testing machine to load the tension. After the tension is loaded to the set value, observe and determine the tension value borne by the underwater instrument and equipment 5 by observing the value on the force sensor 10. Tighten the two positioning force nuts 3 on the lower side of the upper end cover 2 respectively to increase the tension value borne by the underwater instrument and equipment 5. Observe the tension value on the force sensor 10 until the tension value reaches the rated tension value. Stop twisting the two positioning force nuts 3 on the lower side of the upper end cover 2. At this time, tighten the two positioning force nuts 3 on the upper side of the upper top cover 2.

[0035] Secondly, the entire device is removed from the tensile testing machine and left to stand for 48 hours to observe whether the tensile value on the force sensor 10 changes, ensuring that the value on the force sensor 10 always reaches the rated tensile force of the underwater instrument.

[0036] Finally, the entire device is placed in the pressure device under the rated tensile force, and the pressure value of the pressure device is adjusted to the rated pressure value required when the underwater instrument is designed. The entire device is kept under this pressure for 48 hours, and the pressure value on the pressure gauge of the pressure device is observed to see if it changes. If the pressure value does not change, take it out after 48 hours, let it stand for 2 hours, and observe whether the tensile force value of the underwater instrument changes through the force sensor 10.

[0037] At this point, the entire process of the tensile and pressure resistance test of underwater instruments and equipment is completed. This test method can realize the test tasks of underwater instruments and equipment while meeting both pressure resistance and tensile resistance states, and test the working performance of underwater instruments under real tensile and pressure resistance working conditions.

Claims

1. A device for measuring the tensile and compressive properties of underwater instruments, characterized by: It includes two load-bearing screws; an upper end cover and a lower end cover are installed at both ends of the load-bearing screw; a mounting assembly for connecting the instrument to be tested is provided between the upper end cover and the lower end cover; the mounting assembly is connected to a force sensor; the mounting assembly includes a pin hole, an upper connecting bolt, a lower connecting bolt and a shackle arranged on the lower surface of the upper end cover; the upper and lower sides of the upper end cover or the lower end cover are respectively fixed by nuts; the upper end cover and the lower end cover are provided with connecting components for connecting a tensile testing machine; during the tensile test, the main force-bearing components are eight nuts, two load-bearing screws and the upper end cover and the lower end cover; the device is tensilely loaded by using a tensile testing machine, and the tensile loading value is monitored in real time by a force sensor connected to the device; after the tensile force reaches a predetermined value, the nuts on the upper and lower sides of the upper end cover are tightened to achieve tensile maintenance, and after confirming that the tensile force meets the test requirements under the load-keeping state, the device as a whole is placed in a pressure-bearing device for a pressure resistance test.

2. The device for measuring the tensile and compressive properties of underwater instruments according to claim 1, characterized in that: The upper end cover or the lower end cover is provided with a reinforcing rib plate.

3. A method for testing the tensile and compressive properties of underwater instruments, using the measuring device of claim 1, characterized in that: include: After the instrument to be tested is installed on the measuring device, the device is subjected to tensile loading using a tensile testing machine, and the tensile loading value is monitored in real time through a force sensor connected to the device; After the tension reaches a predetermined value, tighten the nuts on the upper and lower sides of the upper end cover to maintain the tension; After being disassembled from the tensile testing machine, the change of tensile force value is monitored in real time through the force sensor on the device; After confirming that the tensile force meets the test requirements under the load-maintaining state, the entire device is placed in the pressure-bearing equipment for a pressure test.

4. The method for testing the tensile and compressive properties of underwater instruments according to claim 3, characterized in that: The tensile load holding time of the tensile test is 48 hours or set according to the tensile test requirements.

5. The method for testing the tensile and compressive properties of underwater instruments according to claim 3, characterized in that: The test time of the pressure test is 48 hours or set according to the pressure test requirements.

6. The method for testing the tensile and compressive properties of underwater instruments according to any one of claims 3 to 5, characterized in that: During the pressure test, the execution action monitoring of the instrument under test and the output signal of the force sensor are output to the outside of the tank through the watertight plug in the high-pressure tank for real-time monitoring, and the posture of the instrument under test is monitored by the underwater camera in the tank.

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