CN108088623B - Vacuum chamber system leakage detection device and method for 3D printing equipment - Google Patents
Vacuum chamber system leakage detection device and method for 3D printing equipment Download PDFInfo
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- CN108088623B CN108088623B CN201711295103.5A CN201711295103A CN108088623B CN 108088623 B CN108088623 B CN 108088623B CN 201711295103 A CN201711295103 A CN 201711295103A CN 108088623 B CN108088623 B CN 108088623B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
- G01M3/20—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material
- G01M3/22—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators
- G01M3/226—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators for containers, e.g. radiators
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- Examining Or Testing Airtightness (AREA)
Abstract
The invention provides a vacuum chamber system leak detection device and a leak detection method for 3D printing equipment. Further, in the above leak detector, the vacuum chamber system is a vacuum chamber system maintaining an airtight environment, and includes: a vacuum box; the bin, the filter, the blower, the helium tank and the vacuum pump are respectively connected with the vacuum box; a conduit connecting the filter and the blower; and a sealing door. Therefore, according to the invention, the air tightness of the 3D printing device can be detected in the working state, so that the 3D printing device with good air tightness is manufactured.
Description
Technical Field
The invention relates to the field of 3D printing air tightness detection, in particular to a vacuum chamber system leakage detection device and method for 3D printing equipment.
Background
In the field of metal 3D printing, airtightness is one of the important and crucial hard indicators of equipment. Equipment hermeticity is one of several key factors affecting process testing. The negative impact of the air tightness not meeting the design requirements is divided according to the degree: the light weight, the large air consumption of the equipment and the poor forming quality of the parts; heavy, the parts are oxidized seriously and cannot be molded; furthermore, the operation safety of the equipment is affected, for example, the aluminum alloy powder has high danger, so the requirement on the oxygen content is strict.
The existing metal 3D printing equipment can be divided into two types of vacuum pumping and non-vacuum pumping. According to the statistical data of the air consumption of the existing 3D printing equipment, the air consumption of the non-vacuumizing equipment is far larger than that of the vacuumizing equipment, and is usually 4-10 times. The difference of the gas consumption of various brands and models of the vacuum-pumping equipment is remarkable, wherein the gas consumption of the vacuum-pumping equipment represented by Renyao is about 0.25L/h, the vacuum-pumping equipment can continuously print for half a month without replacing a 40L helium bottle, and domestic equipment is generally in the magnitude of 1L/h at present. In addition, the comparison shows that the large air consumption of the equipment is inversely related to the quality of the molded parts, and the molding quality is poorer when the air consumption is larger. In order to control the air consumption and manufacture equipment with good air tightness, a certain detection method and a certain tool are required to detect and repair the air tightness of the equipment in a working state.
The invention discloses a vacuum chamber system leak detection device and a leak detection method for 3D printing equipment, which can detect the air tightness of the equipment in a working state, accurately reflect the leakage rate condition of the equipment in the working state, and accurately determine the key part of the equipment with improved air tightness, thereby improving the air tightness of the equipment and ensuring the forming quality of parts.
The problems to be solved by the invention are as follows:
in view of the above problems, the present invention provides a leak detection device and a leak detection method for a vacuum chamber system of a 3D printing apparatus, so as to solve the problems that the airtightness of the apparatus cannot be detected under a working condition and the airtightness is poor under the working condition and cannot be positioned and repaired in the process of developing or using the apparatus in the 3D printing field.
Disclosure of Invention
The invention aims to provide a vacuum chamber system leakage detection device and a leakage detection method for a 3D printing device, which can detect the air tightness of the 3D printing device in a working state so as to manufacture the 3D printing device with good air tightness.
The invention discloses a vacuum chamber system leak detection device for 3D printing equipment.
Optionally, in the above leak detection apparatus for a vacuum chamber system of a 3D printing device, the vacuum chamber system is a vacuum chamber system maintaining an airtight environment, and includes: a vacuum box; the bin, the filter, the blower, the helium tank and the vacuum pump are respectively connected with the vacuum box; a conduit connecting the filter and the blower; and a sealing door.
Optionally, the helium mass spectrometer is used in the leakage detecting device for the vacuum chamber system of the 3D printing apparatus, and has: a helium leak detector; the suction gun is arranged on the helium leak detector; and the molecular pump and the regulator are arranged outside the helium leak detector, and the molecular pump is used for adjusting and controlling the frequency and the flow rate through the regulator.
Optionally, in the leakage detecting device for the vacuum chamber system of the 3D printing apparatus, an interface of the detection tool is connected to the suction gun, and the detection tool is any one of an arc detection tool, a height-adjustable detection tool, a columnar part detection tool, and a narrow slit detection tool.
The invention discloses a vacuum chamber system leak detection method for a 3D printing device.
A vacuum pump is adopted to carry out vacuum pumping operation on the vacuum chamber system, so that the pressure in the box body reaches a preset pressure value;
helium is filled in the box body, and air is stopped being supplied when the pressure reaches the working state of the equipment;
starting a blower to enable gas to circularly flow in the box body;
starting a helium mass spectrometer and a molecular pump, and measuring the helium amount of the measuring environment;
the equipment performs a pressure maintaining test for t1 time, and performs helium mass spectrum leak detection under the condition that the pressure is still maintained after t1 time;
detecting a structure or a part which is possibly leaked by adopting a suction gun connected with a detection tool;
and detecting and recording each point data, if the leakage rate of the equipment is greater than the set leakage rate value, determining that the point has a leakage point, and if the leakage rate is not greater than the set leakage rate value, determining that the leakage rate is normal.
The invention has the following effects:
as described above, the present invention provides a leak detection apparatus and a leak detection method for a vacuum chamber system of a 3D printing device, which can perform air tightness detection on the 3D printing device in a working state, accurately reflect the leak rate of the device in the working state, determine a leak point according to air tightness detection data, accurately determine a key part of the device, whose air tightness needs to be improved, improve the air tightness of the device by implementing corresponding air tightness improvement measures, and ensure the forming quality of a part, thereby manufacturing a 3D printing device with good air tightness.
Drawings
Fig. 1 is a schematic diagram of a vacuum chamber system leak detection device for a 3D printing apparatus according to an embodiment of the present invention.
Fig. 2 is a schematic view of a vacuum chamber system 1 according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of a modified helium mass spectrometer 2 in accordance with an embodiment of the present invention.
Fig. 4(a) to (d) are schematic views of the inspection tool 3 according to the embodiment of the present invention.
Detailed Description
Hereinafter, an embodiment of a vacuum chamber system leak detection apparatus and a leak detection method for a 3D printing device according to the present invention will be described in detail with reference to the accompanying drawings. This embodiment is merely an example of a preferred embodiment of the present invention, and is not to be construed as limiting the invention.
As shown in the drawings, the vacuum chamber system leak detection device for a 3D printing apparatus of the present embodiment includes a helium mass spectrometer 2, a detection tool 3, and a vacuum chamber system 1 to be detected.
In the present embodiment, the vacuum chamber system 1 is a vacuum chamber system maintaining an airtight environment, and includes: a vacuum box 101; a feed box 102, a filter 103, a blower 104, a helium tank 106 and a vacuum pump 107 which are respectively connected with the vacuum box 101; a pipe 105 connecting the filter 103 and the blower 104; and a sealing door. In addition, the installation reference of all other components in the vacuum chamber system 1 is a key component for ensuring the maintenance of the atmosphere.
In the present embodiment, the helium mass spectrometer 2 has a helium leak detector 201; a suction gun 202 arranged on the helium leak detector 201; a molecular pump 203 and a regulator 204 provided outside the helium leak detector 201, wherein the molecular pump 203 performs regulation control of frequency and flow rate by the regulator 204. That is, the helium mass spectrometer is suitably modified by adding a molecular pump 203 and a regulator 204 having functional requirements to the original instruments (the helium leak detector 201 and the suction gun 202).
In addition, the interface of the detection tool 3 is connected with the suction gun 202 of the helium mass spectrometer 2, and the detection tool 3 is any one of an arc detection tool, a height-adjustable detection tool, a columnar part detection tool and a narrow slit detection tool.
In the embodiment, in order to accurately measure the overall leakage rate of the equipment interface and the local structure, a set of special tool capable of meeting the air tightness detection of parts with different structures is designed, namely the detection tool 3 can be an arc detection tool 301 for detecting the air tightness of the cambered surface part; the height-adjustable detection tool 302 is used for detecting the integral air tightness of the large-scale part, and the height adjustable range is H +/-e; the columnar part air tightness detection tool 303 for detecting the columnar parts can wrap the columnar parts in a surrounding manner and detect the local air tightness of the columnar parts; the narrow gap air tightness detection tool 304 for the narrow gap structure can be used for detecting the air tightness of the narrow gap structure. Therefore, the overall air tightness of the single-point and local structure of the equipment can be accurately detected.
The four detection tools 3 can be used only by connecting the suction gun 202 at the interface, the installation mode is simple, the tool can be quickly disassembled and assembled, the operation feasibility is high, and the air tightness detection result is accurate.
In addition, the vacuum chamber system leak detection method for the 3D printing apparatus of the present embodiment includes the following steps.
The vacuum chamber system 1 is vacuumized by the vacuum pump 107 so that the pressure in the chamber body reaches a predetermined pressure value.
Helium is filled in the box body, and air supply is stopped when the pressure reaches the working state of the equipment.
The blower 104 is turned on to circulate the gas within the enclosure.
The helium leak detector 201 and the molecular pump 203 are turned on, and the amount of helium in the measurement environment is measured.
The apparatus performs a dwell test for a time t1, e.g., 30 minutes, and performs helium mass spectrometer leak detection while the pressure remains maintained after 30 minutes at time t 1; although the time t1 is 30 minutes in the present embodiment, the present invention is not limited to this, and other times may be selected in other embodiments according to circumstances.
The suction gun 202 connected with the detection tool 3 is used for detecting structures or parts with possible leakage. For different structures, different detection tools may be adopted, and specifically, the device for detecting a leak in a vacuum chamber system of a 3D printing apparatus in the embodiment described above is referred to.
And detecting and recording each point data, if the leakage rate of the equipment is greater than the set leakage rate value, determining that the point has a leakage point, and if the leakage rate is not greater than the set leakage rate value, determining that the leakage rate is normal. The leak rate set value referred to herein is set according to the national detection standard.
And then closing the equipment after the detection is finished, and stopping the air tightness detection.
In the leak detection method of the present embodiment, in order to make the helium mass spectrometer 2 suitable for airtightness detection in the operating state of the 3D printing apparatus, an original helium mass spectrometer composed of the helium leak detector 201 and the suction gun 202 is suitably modified, a molecular pump 203 capable of adjusting the frequency and the flow rate is connected to the outside of the helium leak detector 201, and the molecular pump 203 can adjust and control the frequency and the flow rate by the regulator 204.
In summary, the device and the method for detecting the leak of the vacuum chamber system of the 3D printing apparatus disclosed by the present invention can detect the air tightness of the apparatus in a working state, accurately reflect the leak rate of the apparatus in the working state, accurately determine the key part of the apparatus whose air tightness needs to be improved, and can greatly improve the air tightness of the apparatus through strict detection process and correct remedial measures, thereby ensuring the forming quality of the part.
The present invention has been described in detail. It will be readily understood by those skilled in the art that the present invention is not limited to the specific embodiments illustrated above, and that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (2)
1. A vacuum chamber system leak detection device for 3D printing equipment is characterized by comprising a helium mass spectrometer, a detection tool and a vacuum chamber system to be detected;
the vacuum chamber system is a vacuum chamber system maintaining an airtight environment, and includes:
a vacuum box; the bin, the filter, the blower, the helium tank and the vacuum pump are respectively connected with the vacuum box;
a conduit connecting the filter and the blower; and a sealing door;
the helium mass spectrometer has: a helium leak detector; the suction gun is arranged on the helium leak detector; the molecular pump and the regulator are arranged outside the helium leak detector, and the molecular pump is used for adjusting and controlling the frequency and the flow rate through the regulator;
a vacuum pump is adopted to carry out vacuum pumping operation on the vacuum chamber system, so that the pressure in the box body reaches a preset pressure value; helium is filled in the box body, and air is stopped being supplied when the pressure reaches the working state of the equipment; starting a blower to enable gas to circularly flow in the box body; starting a helium mass spectrometer and a molecular pump, and measuring the helium amount of the measuring environment; the equipment performs a pressure maintaining test for t1 time, and performs helium mass spectrum leak detection under the condition that the pressure is still maintained after t1 time;
detecting a structure or a part which is possibly leaked by adopting a suction gun connected with a detection tool; and detecting and recording each point data, if the leakage rate of the equipment is greater than the set leakage rate value, determining that the point has a leakage point, and if the leakage rate is not greater than the set leakage rate value, determining that the leakage rate is normal.
2. The vacuum chamber system leak detection device for the 3D printing equipment as defined in claim 1, wherein an interface of the detection tool is connected with the suction gun, and the detection tool is any one of an arc detection tool, a height-adjustable detection tool, a columnar part detection tool and a narrow slit detection tool.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711295103.5A CN108088623B (en) | 2017-12-08 | 2017-12-08 | Vacuum chamber system leakage detection device and method for 3D printing equipment |
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| CN201711295103.5A CN108088623B (en) | 2017-12-08 | 2017-12-08 | Vacuum chamber system leakage detection device and method for 3D printing equipment |
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| CN108088623A CN108088623A (en) | 2018-05-29 |
| CN108088623B true CN108088623B (en) | 2020-08-25 |
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| CN108788152B (en) * | 2018-06-29 | 2019-08-20 | 武汉大学 | Have the increasing material system of processing and method of environment composition on-line checking function |
| CN108844690A (en) * | 2018-07-12 | 2018-11-20 | 上海航天设备制造总厂有限公司 | A kind of pressure reducer leak rate test macro and method |
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| CN101408466B (en) * | 2008-11-08 | 2010-06-02 | 宁夏电力科技教育工程院 | Method and device for detecting leakage of shell type heat exchanger |
| CN201464134U (en) * | 2009-03-16 | 2010-05-12 | 浙江上能锅炉有限公司 | Vacuum leak detection device of vacuum hot-water boiler |
| CN205067031U (en) * | 2015-09-23 | 2016-03-02 | 梅晨 | Vehicle leaks comprehensive testing instrument |
| CN106525354B (en) * | 2016-11-21 | 2018-10-19 | 江苏安靠智能输电工程科技股份有限公司 | A kind of leak detection system and method for gas pipeline busbar shell |
| CN206609571U (en) * | 2017-03-28 | 2017-11-03 | 凯盛重工有限公司 | A kind of vacuum coating cavity leak detection system |
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