CN-122016501-A - Low-temperature mechanical testing device

CN122016501ACN 122016501 ACN122016501 ACN 122016501ACN-122016501-A

Abstract

The application provides a low-temperature mechanical testing device, which belongs to the field of low-temperature mechanics and comprises a shell, a sealing assembly, a fixing assembly, a temperature control device, a driving device and an observation device. The shell is provided with a heat insulation cavity and two openings communicated with the heat insulation cavity, the sealing assembly comprises two sealing pieces which are respectively arranged corresponding to the two openings, a preformed hole and a cooling channel are formed in the sealing pieces, the preformed hole is communicated with the heat insulation cavity, the cooling channel is arranged corresponding to the inner wall of the preformed hole, the fixing assembly comprises a force application part and a fixing part, the force application part is movably arranged in the preformed hole of one sealing piece, the fixing part is arranged in the preformed hole of the other sealing piece, the temperature control device is arranged in the heat insulation cavity, the driving device is connected with the force application part, and the observation device is arranged in the heat insulation cavity. The application can reduce the transmission of external heat to the test area, and improve the stability of the low-temperature environment, thereby improving the accuracy of the test result.

Inventors

WANG JIAMING
Ma Yaocai
ZHOU ZILONG
YU JIAKANG
WANG ZIYU

Assignees

中南大学

Dates

Publication Date: 20260512
Application Date: 20260129

Claims (10)

1. A low temperature mechanical testing device, comprising: A housing having a heat insulating cavity and two openings in communication with the heat insulating cavity; The sealing assembly comprises two sealing elements which are respectively arranged corresponding to the two openings, a preformed hole and a cooling channel are formed in the sealing elements, the preformed hole is communicated with the heat insulation cavity, and the cooling channel is arranged corresponding to the inner wall of the preformed hole; The fixing assembly comprises a force application part and a fixing part, wherein the force application part is movably arranged in a preformed hole of one sealing element, the fixing part is arranged in a preformed hole of the other sealing element, and the force application part and the fixing part are oppositely arranged and used for clamping a sample to be tested; The temperature control device is arranged in the heat insulation cavity and used for adjusting the temperature in the heat insulation cavity; a driving device connected with the force application part for driving the force application part to approach or separate from the fixing part so as to apply pressure to the sample to be tested clamped between the force application part and the fixing part, and And the observation device is arranged in the heat insulation cavity and is used for carrying out optical detection on the sample to be detected.
2. The cryogenic mechanical testing device of claim 1, wherein the sealing portion comprises a first connecting portion and a second connecting portion and a cooling portion, the first connecting portion is formed with a first opening, the second connecting portion is formed with a second opening, the cooling portion is formed with a through hole, the cooling channel is looped on an inner wall of the through hole, and the first opening and the second opening define the preformed hole together with the through hole.
3. The cryogenic mechanical testing device of claim 2, wherein the first connection portion, the second connection portion, and the cooling portion are provided separately.
4. The low-temperature mechanical testing device according to claim 3, wherein two ends of the cooling portion are respectively sleeved on the first opening and the second opening, and a fastener is arranged between the first connecting portion and the second connecting portion.
5. The cryogenic mechanical testing device of claim 2, wherein a sealing element is disposed within the preformed hole of the first connection portion, the first connection portion being disposed in the opening.
6. The low-temperature mechanical testing device according to claim 1, wherein a light-transmitting portion is provided on the housing, the light-transmitting portion including a base body and a conductive film, the conductive film being provided on the base body.
7. The low temperature mechanical testing device of claim 6, wherein the substrate comprises two light-transmitting layers arranged at intervals, and the conductive film is arranged on the side surface of the light-transmitting layers, which is in contact with the heat insulation cavity.
8. The cryogenic mechanical testing device of claim 1, wherein the temperature control device comprises a delivery conduit that communicates between the insulating cavity and an external medium reservoir.
9. The cryogenic mechanical testing device of claim 8, wherein the housing further comprises an airflow channel in communication with the insulating cavity.
10. The low-temperature mechanical testing device according to claim 8, wherein the temperature control device further comprises a temperature sensor and an electromagnetic distribution valve, the temperature sensor is arranged in the heat insulation cavity, and the electromagnetic distribution valve is arranged in the conveying pipeline and is electrically connected with the temperature sensor.

Description

Low-temperature mechanical testing device Technical Field The application relates to the technical field of low-temperature mechanical testing, in particular to a low-temperature mechanical testing device. Background In projects such as cold zone engineering, liquefied Natural Gas (LNG) underground storage, polar resource development, and the like, rock mass is in a low-temperature or even ultra-low-temperature environment for a long period of time. Dynamic loads generated by engineering activities such as blasting, mechanical excavation and the like are coupled with a low-temperature environment, and the stability of the rock mass is severely challenged. Therefore, it is important to study the dynamic mechanical behavior of rock materials at low temperatures. However, in the related art, when the combination of the low-temperature environment and the mechanical loading is realized, the external heat is easily transferred to the test area, so that the stable low-temperature environment is difficult to maintain, and the accuracy of the test result is affected. Disclosure of Invention In view of the technical problems in the background art, the application provides a low-temperature mechanical testing device, which can reduce the transmission of external heat to a testing area and improve the stability of a low-temperature environment, thereby improving the accuracy of a testing result. The embodiment of the application provides a low-temperature mechanical testing device, which comprises: A housing having a heat insulating cavity and two openings in communication with the heat insulating cavity; the sealing assembly comprises two sealing elements which are respectively arranged corresponding to the two openings, a preformed hole and a cooling channel are formed in the sealing elements, the preformed hole is communicated with the heat insulation cavity, and the cooling channel is arranged corresponding to the inner wall of the preformed hole; The fixing assembly comprises a force application part and a fixing part, wherein the force application part is movably arranged in a preformed hole of one sealing element, the fixing part is arranged in a preformed hole of the other sealing element, and the force application part and the fixing part are oppositely arranged and used for clamping a sample to be tested; The temperature control device is arranged in the heat insulation cavity and used for adjusting the temperature in the heat insulation cavity; A driving device connected with the force application part for driving the force application part to approach or separate from the fixed part so as to apply pressure to the sample to be tested clamped between the force application part and the fixed part, and And the observation device is arranged in the heat insulation cavity and is used for carrying out optical detection on the sample to be detected. Further, the sealing part comprises a first connecting part, a second connecting part and a cooling part, wherein the first connecting part is provided with a first opening, the second connecting part is provided with a second opening, the cooling part is provided with a through hole, the cooling channel is annularly arranged on the inner wall of the through hole, and the first opening, the second opening and the through hole jointly define a reserved hole. Further, the first connecting portion, the second connecting portion and the cooling portion body are provided. Further, the two ends of the cooling part are respectively sleeved on the first opening and the second opening, and a fastener is arranged between the first connecting part and the second connecting part. Further, a sealing element is arranged in the reserved hole of the first connecting portion, and the first connecting portion is arranged at the opening. Further, a light-transmitting part is arranged on the shell and comprises a base body and a conductive film, and the conductive film is arranged on the base body. Further, the matrix comprises two light-transmitting layers which are arranged at intervals, and the conductive film is arranged on the side surface of the light-transmitting layers, which is contacted with the heat insulation cavity. Further, the temperature control device comprises a conveying pipeline which is communicated between the heat insulation cavity and an external medium storage. Further, the housing also includes an air flow passage in communication with the insulated cavity. Further, the temperature control device further comprises a temperature sensor and an electromagnetic distribution valve, wherein the temperature sensor is arranged in the heat insulation cavity, and the electromagnetic distribution valve is arranged in the conveying pipeline and is electrically connected with the temperature sensor. The beneficial effects of the invention are that: In the technical scheme of the invention, the cooling channel can cool the inner wall of the preformed hole. When the force appli