CN101722087B - Vacuum sealing milling tank and using method thereof - Google Patents
Vacuum sealing milling tank and using method thereof Download PDFInfo
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- CN101722087B CN101722087B CN2008102253555A CN200810225355A CN101722087B CN 101722087 B CN101722087 B CN 101722087B CN 2008102253555 A CN2008102253555 A CN 2008102253555A CN 200810225355 A CN200810225355 A CN 200810225355A CN 101722087 B CN101722087 B CN 101722087B
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Abstract
The invention provides a vacuum sealing milling tank which comprises a milling cylinder body, a cylinder body upper cover and a combination valve, wherein the combination valve passes through the upper part of the cylinder body upper cover and forms a valve together with the cylinder body upper cover; and the upper end of the milling cylinder body is matched with the lower end of the cylinder body upper cover in a sealing way. The invention also provides a method for using the milling tank, comprising: putting a sample and a steel ball into the milling cylinder body, covering the cylinder body upper cover, and opening a valve; using the combination valve to extract the air inside the milling tank; closing the valve, and freezing the milling tank; after being frozen, putting the milling tank into a milling instrument, and grinding the sample; after that, leading the combination valve to be connected with a collection pipeline, opening the valve, and transferring and collecting oil gas by the collection pipeline; and then, carrying out analysis on the collected oil gas. By adopting the invention, the milling tank can be vacuumized and ensured the sealing performance, so that the trace oil gas and components which are released after solid matter is crushed can be completely sealed, collection and quantitative analysis can be effectively carried out on the trace oil gas, and the sample is prevented from being oxidized by the air inside the milling tank.
Description
Technical field
The invention belongs to solid matter and pulverize the field of milling, be specifically related to a kind of vacuum sealing milling tank and using method thereof.
Background technology
In the oil-gas exploration and development field, the solid geological sample can produce a certain amount of gas and oil in the ultra-fine grinding mill processes, need seal the denier oil gas and the composition that discharge after the solid matter fragmentation fully, so that carry out every analysis; Yet, the heat that solid matter can produce in the ultra-fine grinding mill processes simultaneously, the solid matter that very easily causes being milled is influenced the analysis result of each composition by air generation oxidation.Pulverizing the instrument of milling at present has a lot, wherein representative and advanced is PM200 planet-shaped ball milling instrument that German Retsch company makes, this equipment is to the fine gtinding of solid matter, can reach high fineness of grind, until submicron order, but the milling tank (see figure 1) that is disposed is by 101 cylindrical shells of milling; 102O type circle; 103 loam cakes of milling are formed.This kind milling tank is to mill at the ultra-fine grinding of general solid matter to design, and does not consider the problems referred to above.Therefore, there is following shortcoming in the device of this structure: this installs that it is simple in structure (1), and poor sealing performance can not vacuumize.(2) can't micro-oil gas and the composition that solid matter discharges after fragmentation be sealed fully.Thereby can not be effectively to micro-oil gas collection and quantitative analysis.(3) heat that produces in long-time mill processes of solid matter, the solid matter that causes milling is by the air oxidation in the milling tank.
Summary of the invention
The objective of the invention is to overcome the weak point that above-mentioned prior art exists, a kind of vacuum seal jar and using method thereof are provided, can seal the denier oil gas and the composition that discharge after the solid matter fragmentation fully, to micro-oil gas collection and quantitative analysis, prevent that simultaneously solid matter is by air oxidation in the milling tank effectively.
The present invention is achieved by the following technical solutions:
A kind of vacuum sealing milling tank comprises the cylindrical shell of milling, cylinder top cover, and described vacuum sealing milling tank also comprises combination valve, and it passes described cylinder top cover and forms valve with it; The described cylindrical shell upper end of milling is sealed and matched with described cylinder top cover lower end.Put with the contact position of cylinder top cover lower end the described cylindrical shell upper end of milling cylindrical shell end O type circle; The described cylindrical shell of milling is connected by fastening bolt with described cylinder top cover, described fastening bolt pass cylinder top cover flange hole and with the cylindrical shell of milling on corresponding flange screw hole connect, to reach the effect that is sealed and matched.Described cylinder top cover center is processed with the through hole with its coaxial line, and described through hole is a shoulder hole; Described shoulder hole is followed successively by hole, mesopore and following hole from described cylinder top cover upper surface to lower surface, hole, described upper, middle and lower all is cylindrical, the described internal surface of hole of going up is processed with internal thread, described mesopore carries out the transition to down the hole by a bellmouth, and the diameter of described mesopore is less than the described diameter in hole down.
Described combination valve comprises valve rod, valve rod O type circle, valve O type circle, regulates bolt, pieces together jack panel, baffle ring and jam nut; Described adjusting bolt center has a central through hole with its coaxial line, and its Surface Machining has external screw thread, and described central through hole matches with described valve rod; The lower surface of described assembly jack panel contacts with the upper surface of described cylinder top cover; Described adjusting bolt matches with the last hole internal thread of described assembly jack panel and described cylinder top cover respectively by external screw thread; Described adjusting bolt, O type circle, baffle ring and jam nut are sleeved on the described valve rod successively; The upper surface of described adjusting bolt contacts with the lower surface of described baffle ring, and the upper surface of described baffle ring contacts with the lower surface of described jam nut; When the positive and negative rotation of described adjusting bolt, drive described valve rod and in the through hole of described cylinder top cover, move up and down, the effect of playing valve opening and closing.After moving valve-off on the described adjusting bolt drive valve rod, screw described assembly jack panel, play the effect of secured adjusted bolt, thereby also played the fixedly effect of valve rod, so guaranteed effectively that hermetically sealed can valve in strenuous exercise's process closes the effect of sealing all the time.
Specifically, described valve rod is a multidiameter, is followed successively by path section, middle footpath section and big footpath section.Path section outer surface is processed with screw thread, matches with described adjusting bolt and jam nut; Middle footpath section is slidingly matched with the mesopore of described cylinder top cover; The intersegmental shoulder end face in path section and middle footpath contacts with described adjusting bolt lower surface; Big footpath section is slidingly matched with the following hole of described cylinder top cover.From described path section end face to footpath section end face, be processed with a long blind hole with the valve rod coaxial line at described valve rod center, the blind hole end is arranged in section junction, Duan Yuda footpath, footpath; Stem exterior surface at described blind hole end has aperture, and described aperture and described long blind hole connect.Described long blind hole has three holes to constitute, and middle hole is little, and the hole of two ends is big; The shoulder that the aperture of the upper end macropore of described long blind hole and centre forms is convenient to be tightly connected with the collection pipeline; The lower end macropore of described long blind hole helps vacuumizing.For the ease of little in the middle of processing, the blind hole that two ends are big adopts processing long through-hole earlier, and the method for welding plug-hole with welding block is processed into described long blind hole then.Specifically, described long blind hole is welded by a through hole and a welding block with the valve rod coaxial line, described welding block is the lower end that embeds and be welded on described valve rod central through hole from the big footpath of valve rod section, an one end face is concordant with big footpath section end face, and another end face is positioned at the valve rod central through hole and is positioned at the below of described aperture.In addition, described little hole number is four and about long blind hole symmetry, described four apertures and long blind hole axis normal.Adopt four apertures, increased long blind hole and the pore volume that the milling tank inner chamber is communicated with, help vacuumizing.
When described valve opening, milling tank connects by the described long blind hole and the external world by described aperture again.Have annular groove on the outer surface of footpath section in the valve rod above described aperture, be used to place valve rod O type circle; Concave arc cannelure in having on the stem exterior surface below described aperture is used to place valve O type circle.Described valve rod O type circle is to be used for satisfying valve rod to move up and down in the process clearance seal between the footpath section outer surface and cylinder top cover internal surface of hole in the valve rod in the cylinder top cover hole.When valve closing, described valve O shape circle is positioned at the bellmouth place of described cylinder top cover centre bore bottom, satisfies the sealing between described long blind hole and the milling tank inner chamber.
Another technical scheme of the present invention is to use a kind of method of described vacuum sealing milling tank, and it may further comprise the steps
Solid matter sample that (1) will weigh and steel ball are positioned in the described cylindrical shell of milling, and cover described cylinder top cover, tighten described fastening bolt, open valve;
(2) the long blind hole upper end in vavuum pump and the described valve rod is connected, the air in the described milling tank is extracted out by vavuum pump;
(3) valve-off, it is freezing that described milling tank is put into cold-trap;
(4) with the milling tank that freezes, put into the instrument of milling, the sample in the described milling tank is pulverized;
(5) crush after, with the long blind hole in the described valve rod with collect pipeline and link to each other, and, open valve after collecting a pipeline and vacuumizing, the oil gas that desorption is come out shifts collection, the oil gas to collection carries out every analysis then.
Specifically, the valve of opening in step (1) or (5) is by rotating described adjusting bolt, making described valve rod descend in-migration to realize in described cylinder top cover hole; Valve-off in the described step (3) is by the described adjusting bolt of reverse rotation, make described valve rod in described cylinder top cover hole on in-migration realize.
What adopt in step (4) cold-trap in addition, is liquid nitrogen; Sample in the milling tank is to pulverize under high vacuum state; What the instrument of milling adopted is planet-shaped ball milling instrument.
In step (5),, can perhaps get the gas method minimum gas in the milling tank is extracted to oil gas being brought out by in hermetically sealed can, feeding carrier gas with water filling because oil gas is micro-.
Compared with prior art, the invention has the beneficial effects as follows: (1) good seal performance can vacuumize; (2) micro-oil gas and the composition that solid matter is discharged after fragmentation seals fully, thereby can be effectively to micro-oil gas collection and quantitative analysis; (3) prevent that solid matter is by air oxidation in the milling tank.(4) simple in structure, easy to operate.
Description of drawings
Below in conjunction with accompanying drawing the present invention is described in further detail:
Fig. 1: the structural representation of the milling tank that the PM200 planet-shaped ball milling instrument that German Retsch company makes is disposed.
Fig. 2: apparatus of the present invention structural representation.
Concrete structure explanation will be illustrated in conjunction with the following specific embodiment
The specific embodiment
Vacuum sealing milling tank of the present invention as shown in Figure 2, a kind of vacuum sealing milling tank comprises the cylindrical shell 201 of milling, cylinder top cover 205, described vacuum sealing milling tank also comprises combination valve, it passes described cylinder top cover and forms valve with it; Described cylindrical shell 201 upper ends and described cylinder top cover 205 lower ends of milling are sealed and matched.Put the contact position of described mill cylindrical shell 201 upper ends and cylinder top cover 205 lower ends cylindrical shell end O type circle 204; The described cylindrical shell 201 of milling is connected by fastening bolt 206 with described cylinder top cover 205, described fastening bolt 206 pass cylinder top cover 205 flange hole and with the cylindrical shell 201 of milling on corresponding flange screw hole connect, to reach the effect that is sealed and matched.Described cylinder top cover 205 centers are processed with the through hole with its coaxial line, and described through hole is a shoulder hole; Described shoulder hole is followed successively by hole, mesopore and following hole from described cylinder top cover 205 upper surfaces to lower surface, hole, described upper, middle and lower all is cylindrical, the described internal surface of hole of going up is processed with internal thread, described mesopore carries out the transition to down the hole by a bellmouth, and the diameter of described mesopore is less than the described diameter in hole down.
Described combination valve comprises valve rod 210, valve O type circle 202, valve rod O type circle 203, regulates bolt 208, pieces together jack panel 207, baffle ring 209 and jam nut 211; Described adjusting bolt 208 centers have a central through hole with its coaxial line, and its Surface Machining has external screw thread, and described central through hole matches with described valve rod 210; The lower surface of described assembly jack panel 207 contacts with the upper surface of described cylinder top cover 205; Described adjusting bolt 208 matches with the last hole internal thread of described assembly jack panel 207 and described cylinder top cover 205 respectively by external screw thread; Described adjusting bolt 208, baffle ring 209 and jam nut 207 are sleeved on the described valve rod 210 successively; The upper surface of described adjusting bolt 208 contacts with the lower surface of described baffle ring 209, and the upper surface of described baffle ring 209 contacts with the lower surface of described jam nut 211; When described adjusting bolt 208 positive and negative rotations, drive described valve rod 210 and in the through hole of described cylinder top cover 205, move up and down, the effect of playing valve opening and closing.Specifically, regulate bolt 208 and turn clockwise and drive valve rod 210 and move down, then valve open; Adjusting bolt 208 is rotated counterclockwise drive valve rod 210 and moves up, then valve closing.After valve-off, more described assembly jack panel 207 is screwed, play the effect of secured adjusted bolt 208, thereby also played the fixedly effect of valve rod 210, so guaranteed effectively that hermetically sealed can valve in strenuous exercise's process closes the effect of sealing all the time.
Specifically, described valve rod 210 is designed to multidiameter, is followed successively by path section, middle footpath section and big footpath section.Path section outer surface is processed with screw thread, matches with described adjusting bolt 208 and jam nut 211; Middle footpath section is slidingly matched with the mesopore of described cylinder top cover 205; The intersegmental shoulder end face in path section and middle footpath contacts with described adjusting bolt 208 lower surfaces; Big footpath section is slidingly matched with the following hole of described cylinder top cover 205.From described path section end face to footpath section end face, be processed with a long blind hole with valve rod 210 coaxial lines at described valve rod center, the blind hole end is arranged in section junction, Duan Yuda footpath, footpath; Stem exterior surface at described blind hole end has four apertures, and described four apertures connect about long blind hole symmetry and with described long blind hole.When described valve opening, hermetically sealed can connects by the described blind hole and the external world by described aperture again, has annular groove on the footpath section outer surface in the valve rod 210 above described aperture, is used to place valve rod O type circle 203; Concave arc cannelure in having on valve rod 210 outer surfaces below described aperture is used to place valve O type circle 202.Described valve rod O type circle 203 and valve O type circle 202 all are the sealings that is used to satisfy between valve rod and the cylinder top cover hole.When valve closing, described valve O type circle is positioned at the bellmouth place at described cylinder top cover center, and described valve rod 210 big footpath section end faces are concordant with the lower surface of described cylinder top cover 205.Like this, in mill processes, even object strikes cylinder top cover and the big footpath of valve rod section end face in the cylindrical shell of milling, because bellmouth also makes the sealing effectiveness of milling tank better with cooperating of valve O type circle.Described long blind hole is to be welded by a through hole and a welding block with the valve rod coaxial line, described welding block is to embed and be welded in the described valve rod central through hole from the big footpath of valve rod section, an one end face is concordant with big footpath section end face, another end face is positioned at the valve rod central through hole and is positioned at the below of described aperture, can make the hole of described long blind hole in the middle of being processed into little like this, the hole of its two end is big.Middle aperture and the step that the upper end macropore forms help and collect being tightly connected of pipeline, also are convenient to water filling and get the gas method and extract minimum gas in the milling tank, and length blind hole hypomere macropore helps vacuumizing.Described little hole number is four and about long blind hole symmetry, and described four apertures are with to grow blind hole vertical.Like this, can increase the pore volume that long blind hole is communicated with the milling tank inner chamber.Help vacuumizing with milling tank in the discharge of gas.
Another technical scheme of the present invention is to use a kind of method of described vacuum sealing milling tank, and it may further comprise the steps
Solid matter sample that (1) will weigh and steel ball are positioned in the described cylindrical shell of milling, and cover described cylinder top cover, tighten described fastening bolt, open valve;
(2) the long blind hole upper end in vavuum pump and the described valve rod is connected, the air in the described milling tank is extracted out by vavuum pump;
(3) valve-off, it is freezing that described milling tank is put into cold-trap;
(4) with the milling tank that freezes, put into the instrument of milling, the sample in the described milling tank is pulverized;
(5) crush after, with the long blind hole in the described valve rod with collect pipeline and link to each other, and, open valve after collecting a pipeline and vacuumizing, the oil gas that desorption is come out shifts collection, the oil gas to collection carries out every analysis then.
Specifically, the valve of opening in step (1) or (5) is by rotating described adjusting bolt, making described valve rod descend in-migration to realize in described cylinder top cover hole; Valve-off in the described step (3) is by the described adjusting bolt of reverse rotation, make described valve rod in described cylinder top cover hole on in-migration realize.
What adopt in step (4) cold-trap in addition, is liquid nitrogen; Sample in the milling tank is pulverized under high vacuum state; What the instrument of milling adopted is planet-shaped ball milling instrument.
In step (5), because oil gas is micro-, can be to oil gas being brought out by in hermetically sealed can, feeding carrier gas; Perhaps getting the gas method with water filling extracts the minimum gas in the milling tank.
Adopt the present invention, the requirement that milling tank vacuumizes can be satisfied and good seal performance can be guaranteed, micro-oil gas and the composition that solid matter is discharged after fragmentation can seal fully like this, thereby effectively micro-oil gas is collected and quantitative analysis, prevented that also solid matter is by air oxidation in the milling tank simultaneously.And the present invention is simple in structure, and is easy for operation, and combination valve both can be connected by pipeline with the minimum gas buanch unit, also can directly be connected with checkout equipment, so just made things convenient for the analysis of related item.
Technique scheme is one embodiment of the present invention, for those skilled in the art, on the basis that the invention discloses application process and principle, be easy to make various types of improvement or distortion, and be not limited only to the described method of the above-mentioned specific embodiment of the present invention, therefore previously described mode is preferably, and does not have restrictive meaning.
Claims (6)
1. a vacuum sealing milling tank comprises the cylindrical shell of milling, cylinder top cover, it is characterized in that, described vacuum sealing milling tank comprises combination valve, and it passes described cylinder top cover and forms valve with it; The described cylindrical shell upper end of milling is sealed and matched with described cylinder top cover lower end.
Described cylinder top cover center is processed with the through hole with its coaxial line, and described through hole is a shoulder hole; Described shoulder hole is followed successively by hole, mesopore and following hole from described cylinder top cover upper surface to lower surface, hole, described upper, middle and lower all is cylindrical, the described internal surface of hole of going up is processed with internal thread, described mesopore carries out the transition to down the hole by a bellmouth, and the diameter of described mesopore is less than the described diameter in hole down;
Described combination valve comprises valve rod, valve rod O type circle, valve O type circle, regulates bolt, pieces together jack panel, baffle ring and jam nut; Described adjusting bolt center has a central through hole with its coaxial line, and its Surface Machining has external screw thread, and described central through hole matches with described valve rod; The lower surface of described assembly jack panel contacts with the upper surface of described cylinder top cover; Described adjusting bolt matches with the last hole internal thread of described assembly jack panel and described cylinder top cover respectively by external screw thread; Described adjusting bolt, baffle ring and jam nut are sleeved on the described valve rod successively; The upper surface of described adjusting bolt contacts with the lower surface of described baffle ring, and the upper surface of described baffle ring contacts with the lower surface of described jam nut; When the positive and negative rotation of described adjusting bolt, described valve rod moves up and down in the through hole of described cylinder top cover, the effect of playing valve opening and closing;
Described valve rod is a multidiameter, is followed successively by path section, middle footpath section and big footpath section; Path section outer surface is processed with screw thread, matches with described adjusting bolt, baffle ring and jam nut; Middle footpath section is slidingly matched with the mesopore of described cylinder top cover; The intersegmental step end face in path section and middle footpath contacts with described adjusting bolt lower surface; From described path section end face to footpath section end face, be processed with a long blind hole with the valve rod coaxial line at described valve rod center, the blind hole end is arranged in section junction, Duan Yuda footpath, footpath; Stem exterior surface at described blind hole end has aperture, and described aperture and described long blind hole connect; Have annular groove on the outer surface of footpath section in the valve rod above described aperture, be used to place valve rod O type circle; Concave arc cannelure in having on the stem exterior surface below described aperture is used to place valve O type circle, and when valve closing, described valve O type circle is positioned at the bellmouth place of described cylinder top cover centre bore bottom;
Put with the contact position of cylinder top cover lower end the described cylindrical shell upper end of milling cylindrical shell end O type circle; The described cylindrical shell of milling is connected by fastening bolt with described cylinder top cover, described fastening bolt pass cylinder top cover flange hole and with the cylindrical shell of milling on corresponding flange screw hole connect.
2. vacuum sealing milling tank according to claim 1 is characterized in that the aperture that described and long blind hole connects is four, and with described long blind hole symmetry, described four apertures and long blind hole axis normal.
3. vacuum sealing milling tank according to claim 1, it is characterized in that described long blind hole is to be welded by a through hole and a welding block with the valve rod coaxial line, described welding block is the lower end that embeds and be welded on described valve rod central through hole from the big footpath of valve rod section, an one end face is concordant with section lower surface, big footpath, and another end face is positioned at the valve rod central through hole and is positioned at the below of described aperture.
4. use a kind of method, it is characterized in that said method comprising the steps of according to one of claim 1 to 3 vacuum sealing milling tank
Solid matter sample that (1) will weigh and steel ball are positioned in the described cylindrical shell of milling, and cover described cylinder top cover, tighten fastening bolt, open valve;
(2) the long blind hole upper end in vavuum pump and the described valve rod is connected, the air in the described milling tank is extracted out by vavuum pump;
(3) valve-off, it is freezing that described milling tank is put into cold-trap;
(4) with the milling tank that freezes, put into the instrument of milling, the sample in the described milling tank is pulverized;
(5) crush after, with the long blind hole in the described valve rod with collect pipeline and link to each other, and, open valve after collecting a pipeline and vacuumizing, the oil gas that desorption is come out shifts collection, the oil gas to collection carries out every analysis then.
5. a kind of method of the described vacuum sealing milling tank of use according to claim 4 is characterized in that the valve of opening in described step (1) or (5) is by rotating described adjusting bolt, making described valve rod descend in-migration to realize in described cylinder top cover hole; Valve-off in the described step (3) is by the described adjusting bolt of reverse rotation, make described valve rod in described cylinder top cover hole on in-migration realize.
6. a kind of method of the described vacuum sealing milling tank of use according to claim 4 is characterized in that in the described step (4), and the sample in the milling tank is to pulverize under vacuum state; And what adopt in described step (4) cold-trap is liquid nitrogen;
And in the described step (5), feed carrier gas minimum gas is brought out, perhaps get the gas method minimum gas in the milling tank is extracted with water filling.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008102253555A CN101722087B (en) | 2008-10-31 | 2008-10-31 | Vacuum sealing milling tank and using method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2008102253555A CN101722087B (en) | 2008-10-31 | 2008-10-31 | Vacuum sealing milling tank and using method thereof |
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| CN101722087A CN101722087A (en) | 2010-06-09 |
| CN101722087B true CN101722087B (en) | 2011-11-23 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103041895B (en) * | 2011-10-13 | 2015-05-06 | 中国石油化工股份有限公司 | Vacuum ball-milling degassing tank for rare gas analysis, and analysis method |
| DE102012218801A1 (en) * | 2012-10-16 | 2014-04-17 | Schaeffler Technologies Gmbh & Co. Kg | Sealing arrangement for a control valve |
| CN102967667B (en) * | 2012-11-19 | 2015-01-14 | 中国科学院广州地球化学研究所 | Device for qualitatively and quantitatively analyzing shale gas and using method thereof |
| CN104001594A (en) * | 2014-05-12 | 2014-08-27 | 北方民族大学 | Double-layer-protection nanometer ball milling tank |
| CN106153374B (en) * | 2015-04-21 | 2018-11-23 | 中国石油化工股份有限公司 | It is a kind of to seal broken degasser |
| CN106216030B (en) * | 2016-07-27 | 2018-03-02 | 江苏常熟发电有限公司 | Steel ball for coal crushing grinds |
| CN112858586A (en) * | 2021-01-13 | 2021-05-28 | 青岛卓润智能科技有限公司 | Rapid testing device for resistance reduction performance of large Reynolds number and detection method thereof |
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| US3985332A (en) * | 1975-09-17 | 1976-10-12 | Bristol Screw Products Corporation | Non-refillable safety valve |
| DE3122000A1 (en) * | 1981-06-03 | 1982-12-23 | Schäfer, Wilhelm, 4300 Essen | Connection point of gas pipes or water pipes |
| CN2104705U (en) * | 1991-10-30 | 1992-05-20 | 中国科学院金属研究所 | Vacuum and aerated ball grinding pot |
| CN200945443Y (en) * | 2006-05-24 | 2007-09-12 | 中国科学院上海微系统与信息技术研究所 | Ball-milling pot capable of bearing high pressure and vacuum |
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2008
- 2008-10-31 CN CN2008102253555A patent/CN101722087B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3985332A (en) * | 1975-09-17 | 1976-10-12 | Bristol Screw Products Corporation | Non-refillable safety valve |
| DE3122000A1 (en) * | 1981-06-03 | 1982-12-23 | Schäfer, Wilhelm, 4300 Essen | Connection point of gas pipes or water pipes |
| CN2104705U (en) * | 1991-10-30 | 1992-05-20 | 中国科学院金属研究所 | Vacuum and aerated ball grinding pot |
| CN200945443Y (en) * | 2006-05-24 | 2007-09-12 | 中国科学院上海微系统与信息技术研究所 | Ball-milling pot capable of bearing high pressure and vacuum |
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