CN114739825A - Small-size ultra-low temperature environment box for Hopkinson bar - Google Patents
Small-size ultra-low temperature environment box for Hopkinson bar Download PDFInfo
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- CN114739825A CN114739825A CN202210435587.3A CN202210435587A CN114739825A CN 114739825 A CN114739825 A CN 114739825A CN 202210435587 A CN202210435587 A CN 202210435587A CN 114739825 A CN114739825 A CN 114739825A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/18—Performing tests at high or low temperatures
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P60/00—Technologies relating to agriculture, livestock or agroalimentary industries
- Y02P60/80—Food processing, e.g. use of renewable energies or variable speed drives in handling, conveying or stacking
- Y02P60/85—Food storage or conservation, e.g. cooling or drying
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Abstract
The invention belongs to the technical field of material testing, and particularly discloses a small-size ultralow temperature environment box for a Hopkinson bar, which comprises a temperature control system, a heat preservation system and an observation system; the temperature control system comprises a refrigeration pipeline, a temperature thermocouple, an electromagnetic valve and an external temperature controller; the heat insulation system comprises an outer box body, an inner box body, a box door, heat insulation materials, side rod holes which are oppositely arranged, a lantern ring which is detachably arranged at the side rod holes, a sealing ring and a sealing ring positioning sleeve; the observation system comprises a double-layer glass window and an electric heating sheet, wherein the double-layer glass window is arranged in front of the box body, behind the box body and on the upper side of the box body. The invention can keep the experiment temperature at a stable ultralow temperature for a long time, the whole size of the box body is small, the box body is easy to install, the illumination and the image acquisition are convenient in the experiment process, the fragments generated in the impact test can be effectively prevented from splashing, and the service life of the box body is long.
Description
Technical Field
The invention belongs to the technical field of material testing, and particularly relates to a small-size ultralow-temperature environment box for a Hopkinson bar.
Background
The classical Hopkinson bar experiment technology can effectively measure the dynamic mechanical behavior of the material under the high strain rate, but with the development of the deep space exploration technology, the aerospace structure is in service in an ultralow temperature environment and is easy to be subjected to impact load. Therefore, the dynamic mechanical behavior of the material at ultralow temperature becomes a scientific problem generally concerned by people, the dynamic test of the low-temperature performance of the material is required, the classical Hopkinson bar experiment technology cannot meet the measurement requirement, and a low-temperature environment device needs to be developed.
The existing low-temperature environment devices of the same type mainly have the following defects: 1) the acquisition cost is high in an ultralow temperature environment (minus 180 ℃); 2) the synchronous observation in the experimental process is difficult; 3) the utilization rate of the experimental device is low.
Disclosure of Invention
In order to solve the technical problem, the invention provides a small-size ultralow-temperature environment box for a Hopkinson bar, which comprises a temperature control system, a heat preservation system and an observation system, wherein the temperature control system is used for controlling the temperature of the temperature control system; the temperature control system comprises a refrigeration pipeline, a temperature thermocouple, an electromagnetic valve and an external temperature controller; the heat insulation system comprises an outer box body, an inner box body, a box door, heat insulation materials, side rod holes which are oppositely arranged, a lantern ring which is detachably arranged at the side rod holes, a sealing ring and a sealing ring positioning sleeve; the heat insulation material is arranged between the outer box body and the inner box body, and the sealing ring is embedded in the lantern ring; the electromagnetic valve is arranged at one upper corner of the outer box body, the electromagnetic valve is connected with an internal liquid nitrogen pipeline, the refrigeration pipeline is laid at the top of the inner box body, and a cavity is formed in the bottom of the inner box body and used for storing liquid nitrogen; the temperature thermocouples are symmetrically arranged at the height position of the rod piece in the inner box body, and the lead is connected to the output interface of the outer box body; the observation system comprises a box body, a front double-layer glass window, a rear double-layer glass window and an upper double-layer glass window, and an electric heating plate, wherein the electric heating plate is arranged on the outer side of the double-layer glass window.
As a preference: the inner box body, the outer box door and the connecting piece are all made of 304 stainless steel materials, and the small-size ultralow-temperature environment box is integrally formed.
As a preference: the double-layer glass window is a polygonal window; or the double-layer glass window is an arc-shaped window.
As a preference: the heat preservation system also comprises a pressure relief hole arranged on the box door.
As a preference: the heat insulation material is an asbestos material.
As a preference: the sealing ring is made of asbestos materials.
As a preference: the double glazing is made of low temperature resistant quartz glass.
As a preference: the electric heating sheet is made of rubber and resistance wires and is attached to the outer side of the double-layer glass window.
Has the advantages that:
in the invention, liquid nitrogen is selected as a refrigerant, the technology is mature and reliable, the supply amount of the liquid nitrogen is adjusted by feeding back and adjusting the opening and closing of the electromagnetic valve through the temperature controller, and the liquid storage tank is reserved in the inner cavity, so that the experimental temperature can be kept at a stable temperature for a long time. The outer box is small in overall size and easy to install, feet are reserved at four corners of a base of the outer box, a fine adjustment support can be arranged for adjusting the posture of the box, coaxiality of the left and right rod holes, the incident rod and the transmission rod is guaranteed, and meanwhile the rod holes, the incident rod and the transmission rod are not in contact, so that no friction is generated. Double-layer glass windows are arranged in the front direction, the back direction and the upper direction, and an electric heating plate is arranged on the outer side of the double-layer glass windows, so that the double-layer glass windows are convenient for illumination and image acquisition in the experimental process. Interior outer box and connecting piece are 304 stainless steel and make, use for a long time under the high humidity environment and can not produce the corrosion, also be difficult for producing great deformation under the ultra-low temperature to the piece that can effectively prevent the impact test production splashes, has increased the security of experiment.
Drawings
FIG. 1 is a schematic view of the overall construction of a small-sized ultra-low temperature environment chamber of the present invention;
FIG. 2 is a schematic front cross-sectional view of a small-sized ultra-low temperature environment chamber of the present invention mated with a Hopkinson bar;
fig. 3 is a side cross-sectional schematic view of a small-sized ultra-low temperature environment box of the present invention.
In the figure: 1-an outer box body; 2-an inner box body; 3-inner and outer box connecting pieces; 4-heat insulating material; 5-a collar; 6-sealing ring; 7-a sealing ring positioning sleeve; 8-a box door; 9-pressure relief holes; 10-sealing lead ring, 11-liquid nitrogen pipeline; 12-a solenoid valve; 13-a glazing; 14-an electrical heating plate; 15-temperature thermocouple; 16-external interface of temperature thermocouple; 17-fixing feet of the box body; an 18-Hopkinson incident beam; 19-Hopkinson transmission rods.
Detailed Description
For a better understanding of the objects and advantages of the present invention, reference should be made to the following detailed description taken in conjunction with the accompanying drawings and examples.
Example (b):
as shown in fig. 1 to 3, the embodiment discloses a small-sized ultralow temperature environment box for a hopkinson bar, which comprises a temperature control system, a heat preservation system and an observation system; the temperature control system comprises a refrigeration pipeline, a temperature thermocouple, an electromagnetic valve and an external temperature controller; the heat preservation system comprises an outer box body 1, an inner box body 2, a box door 8, heat preservation materials 4, oppositely arranged side rod holes, a lantern ring 5 detachably arranged at the side rod holes, a sealing ring 6 and a sealing ring positioning sleeve 7; the heat insulation material 4 is arranged between the outer box body 1 and the inner box body 2, and the sealing ring 6 is embedded in the lantern ring 5; the electromagnetic valve 12 is arranged at one upper corner of the outer box body 1, the electromagnetic valve 12 is connected with an internal liquid nitrogen pipeline, the refrigeration pipeline is laid at the top of the inner box body, and a cavity is formed at the bottom of the inner box body 2 and used for storing liquid nitrogen; the temperature thermocouples 15 are symmetrically arranged at the height position of the rod piece in the inner box body 2, and the lead is connected to the output interface of the outer box body 1; the observation system comprises a box body, a front double-layer glass window 13, a back double-layer glass window 13, an upper double-layer glass window, and an electric heating plate, wherein the electric heating plate is arranged on the outer side of the double-layer glass window 13.
The whole size of the box body is small, and only 240mm 160mm 180mm, the size of the outer box body is 240mm 160mm 180mm, the size of the inner cavity is 180mm 100mm 130mm, and the size of the glass window is 80mm 60 mm. Outer box 1 uses 8mm thick corrosion resistant plate to make and has higher intensity and corrosion resistance, and interior box 2 uses the stainless steel of 2mm thickness to make, and inside and outside box connecting piece 3 adopts the stainless steel tube welding that 2mm is thick, can dismantle lantern ring 5 and form by the stainless steel processing, and the aperture is removable.
The sealing ring 6 is made of asbestos material. The asbestos material is a material with heat preservation property, and the sealing ring made of the material is arranged in the detachable lantern ring 5 and positioned by the sealing ring positioning sleeve 7 to prevent cold air from escaping during refrigeration. The liquid nitrogen pipeline 11 is made of copper, and liquid nitrogen flows into the bottom of the inner cavity after being cooled to a certain degree when passing through the pipeline, and the inner cavity is continuously cooled.
The electromagnetic valve 12 is arranged at one upper corner of the outer box body 1, one side of the electromagnetic valve is connected with the liquid nitrogen pipeline 11, the other side of the electromagnetic valve is connected with the liquid nitrogen supply pipeline, and negative feedback regulation and control are carried out by an external temperature controller.
The double-layer high-transparency glass observation windows 11 in the front, the back and the upper part of the box body adopt high-low temperature resistant quartz glass and are mainly used for illumination and observation in the experimental process.
The electric heating plate 14 is made of rubber and resistance wires, is soft in texture, does not damage glass, and can be heated to prevent frosting of a glass window.
The temperature thermocouples 15 are symmetrically arranged on the inner side of the inner box body 2, are connected with an external temperature controller through an external interface 16 and are used for monitoring the environment temperature in the box.
The temperature controller is externally connected, the opening and closing of the temperature regulating electromagnetic valve 9 is measured by a temperature thermocouple to control the flow of liquid nitrogen, and the target temperature can be set to be between room temperature and 196 ℃ below zero.
The volume of storable liquid nitrogen of environment case inner chamber bottom for the experiments is 0.6 liters, is about the one third of the internal volume of interior box 2, practices thrift the liquid nitrogen and easily keeps temperature stable, and the side has sufficient space sample of cooling down in advance.
Four ground feet are reserved at the bottom of the low-temperature environment box, threaded holes are formed in the four ground feet, and the four ground feet can be used for fixing and adjusting the height of the low-temperature environment box.
During the experiment, earlier with four lower margins of bottom half and fine setting support assembly, then place on the hopkinson laboratory bench, the height-adjusting is guaranteed with the levelness that incident pole 18 and transmission pole 19 keep coaxial insertion box inside, and can have less clearance with the sealing ring. And (3) putting a test piece, closing the box door 8, then automatically controlling the electronic valve to open and close to cool by the temperature controller through adjusting the set temperature, preserving the heat until the set temperature is reached, carrying out an experiment after the heat preservation time meets the requirement of the experiment, starting the high-speed strain acquisition system, and recording the stress wave signals of the incident rod and the transmission rod to obtain a material stress-strain curve. When the experiment process needs to be recorded, only the camera and the high-intensity lighting equipment need to be placed on the glass window 13 in front of and behind the box body, the sample damage process is recorded by utilizing the shooting system, and the image of the sample damage in the experiment process is collected.
The present invention is not intended to be limited to the particular embodiments shown and described, but is to be accorded the widest scope consistent with the principles and novel features herein disclosed. Other structures and principles are the same as those of the prior art, and are not described in detail herein.
Claims (8)
1. The utility model provides a hopkinson pole is with small-size ultra-low temperature environment case which characterized in that: comprises a temperature control system, a heat preservation system and an observation system; the temperature control system comprises a refrigeration pipeline, a temperature thermocouple, an electromagnetic valve and an external temperature controller; the heat insulation system comprises an outer box body, an inner box body, a box door, heat insulation materials, side rod holes which are oppositely arranged, a lantern ring which is detachably arranged at the side rod holes, a sealing ring and a sealing ring positioning sleeve; the heat insulation material is arranged between the outer box body and the inner box body, and the sealing ring is embedded in the lantern ring; the electromagnetic valve is arranged at one upper corner of the outer box body, the electromagnetic valve is connected with an internal liquid nitrogen pipeline, the refrigeration pipeline is laid at the top of the inner box body, and a cavity is formed in the bottom of the inner box body and used for storing liquid nitrogen; the temperature thermocouples are symmetrically arranged at the height position of the rod piece in the inner box body, and a lead is connected to the output interface of the outer box body; the observation system comprises a box body, a front double-layer glass window, a rear double-layer glass window and an upper double-layer glass window, and an electric heating plate, wherein the electric heating plate is arranged on the outer side of the double-layer glass window.
2. The small-size ultra-low temperature environment chamber of claim 1, wherein: the inner box body, the outer box door and the connecting piece are all made of 304 stainless steel materials, and the small-size ultralow-temperature environment box is integrally formed.
3. The small-sized ultra-low temperature environment chamber as set forth in claim 1, wherein: the double-layer glass window is a polygonal window; or the double-layer glass window is an arc-shaped window.
4. The small-size ultra-low temperature environment chamber of claim 1, wherein: the heat preservation system also comprises a pressure relief hole arranged on the box door.
5. The small-sized ultra-low temperature environment chamber as set forth in claim 1, wherein: the heat insulation material is an asbestos material.
6. The small-size ultra-low temperature environment chamber of claim 1, wherein: the sealing ring is made of asbestos materials.
7. The small-sized ultra-low temperature environment chamber as set forth in claim 1, wherein: the double glazing is made of low temperature resistant quartz glass.
8. The small-size ultra-low temperature environment chamber of claim 1, wherein: the electric heating sheet is made of rubber and resistance wires and is attached to the outer side of the double-layer glass window.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210435587.3A CN114739825A (en) | 2022-04-24 | 2022-04-24 | Small-size ultra-low temperature environment box for Hopkinson bar |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210435587.3A CN114739825A (en) | 2022-04-24 | 2022-04-24 | Small-size ultra-low temperature environment box for Hopkinson bar |
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| Publication Number | Publication Date |
|---|---|
| CN114739825A true CN114739825A (en) | 2022-07-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210435587.3A Pending CN114739825A (en) | 2022-04-24 | 2022-04-24 | Small-size ultra-low temperature environment box for Hopkinson bar |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107687981A (en) * | 2017-09-21 | 2018-02-13 | 南京理工大学 | A kind of liquid nitrogen cooling device suitable for low-temperature dynamic Experiments of Machanics |
-
2022
- 2022-04-24 CN CN202210435587.3A patent/CN114739825A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107687981A (en) * | 2017-09-21 | 2018-02-13 | 南京理工大学 | A kind of liquid nitrogen cooling device suitable for low-temperature dynamic Experiments of Machanics |
| CN107687981B (en) * | 2017-09-21 | 2023-12-15 | 南京理工大学 | Liquid nitrogen cooling device suitable for low temperature dynamic mechanical experiment |
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