CN204283431U - Frigo and Shaft Freezing system - Google Patents
Frigo and Shaft Freezing system Download PDFInfo
- Publication number
- CN204283431U CN204283431U CN201420745675.4U CN201420745675U CN204283431U CN 204283431 U CN204283431 U CN 204283431U CN 201420745675 U CN201420745675 U CN 201420745675U CN 204283431 U CN204283431 U CN 204283431U
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- pipe
- freezing
- freezing pipe
- frigo
- feed pipe
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- Excavating Of Shafts Or Tunnels (AREA)
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Abstract
The utility model provides a kind of frigo and Shaft Freezing system, and frigo comprises: freezing pipe, the first feed pipe and base cone; Wherein, described freezing pipe is made up of top freezing pipe and bottom freezing pipe, is communicated with between described top freezing pipe and described bottom freezing pipe by reducing step, and the caliber of described top freezing pipe is greater than the caliber of described bottom freezing pipe; Described base cone is connected with the bottom of described bottom freezing pipe; Described first feed pipe is stretched into by the top mouth of pipe of described top freezing pipe, and extends to bottom the freezing pipe of described bottom.The utility model is by changing freezing pipe pipe diameter determing, the Discrete control to frost wall can be realized, in whole freeze section work progress, frost wall intensity and thickness, Care in method and a rate of advance are coordinated, weak freezing is not frozen only, improve the safety of self well digging construction, the consumption of using electricity wisely loss and tubing, accomplishes safe and reliable, economy.
Description
Technical field
The utility model relates to Shaft Freezing technology, particularly relates to a kind of frigo and Shaft Freezing system.
Background technology
Freezing technology has been widely applied in the underground construction such as vertical and tunnel, and freezing technology is exactly freeze process in advance to unknown and complicated topsoil.Showing native section in vertical engineering adopts freezing technology construction to pass through.Over nearly 20 years, reach hundreds of with the vertical of construction freezing method, the depth of frost penetration in continuous increase, such as, newly collects the diligent eastern coal mine freezing degree of depth of mouth and reaches 737 meters, once became the darkest freezing wells with high strength RC.Along with the continuous increase of the depth of frost penetration, be difficult in frozen construction accomplish precise controlling, prepare to hold, surpass to freeze or cross to freeze under normal conditions, waste a large amount of electric power and material consumption, dig safely block also to pit shaft simultaneously and bring a lot of uncertain potential safety hazard, cause and freeze shaft construction and disconnected pipe, the serious engineering accident such as permeable occur often, bitter experience lesson memory and profound.
Such as, when the depth of frost penetration is more than 400 meters, the design difficulty of each circle freezing hole is larger, prior art is that full freeze section send cold up and down simultaneously or stops freezing, the easy like this situation causing Care in method uneven up and down, thus bring huge difficulty and potential safety hazard to self well digging construction, cause cost to waste and construction delay.
Utility model content
The utility model provides a kind of frigo and Shaft Freezing system, special in solving Frozen Deep, Temperature Field Control problem and the design carried out, realize carrying out segmentation to whole frost wall and/or controlling by stages, effective solution in the past freezing method easily causes Care in method uneven up and down, thus bring huge difficulty and potential safety hazard to self well digging construction, cause the problem of cost waste and construction delay.
First aspect, the frigo that the utility model provides comprises: freezing pipe, the first feed pipe and base cone; Wherein, described freezing pipe is made up of top freezing pipe and bottom freezing pipe, is communicated with between described top freezing pipe and described bottom freezing pipe by reducing step, and the caliber of described top freezing pipe is greater than the caliber of described bottom freezing pipe; Described base cone is connected with the bottom of described bottom freezing pipe; Described first feed pipe is stretched into by the top mouth of pipe of described top freezing pipe, and extends to bottom the freezing pipe of described bottom.The frigo that the present embodiment provides is by changing freezing pipe pipe diameter determing, due to heat-exchange capacity being eager to excel than thin freezing pipe of thick freezing pipe, therefore the Discrete control to frost wall can be realized, in whole freeze section work progress, frost wall intensity and thickness, Care in method and a rate of advance are coordinated, and weak freezing is not frozen only, improve the safety of self well digging construction, the consumption of using electricity wisely loss and tubing, accomplishes safe and reliable, economy.
In an embodiment of the present utility model, above-mentioned frigo also comprises the second feed pipe, and described second feed pipe stretches into from the top mouth of pipe of described top freezing pipe, and extends to described reducing step place.
In an embodiment of the present utility model, the caliber of above-mentioned second feed pipe is greater than the caliber of described first feed pipe.
In an embodiment of the present utility model, the sidewall of above-mentioned top freezing pipe is also provided with liquid back pipe.
In an embodiment of the present utility model, above-mentioned top freezing pipe, above-mentioned bottom freezing pipe and above-mentioned base cone concentric are arranged.
Second aspect, the frigo that the utility model provides comprises: freezing pipe, the first feed pipe and base cone; Wherein, described base cone is connected with the bottom of described freezing pipe; Described first feed pipe is stretched into by the top mouth of pipe of described freezing pipe, and extends to the bottom of described freezing pipe; Also comprise: the second feed pipe; Described second feed pipe is stretched into by the top mouth of pipe of described freezing pipe, and extends to the centre position of described freezing pipe.The frigo that the present embodiment provides is designed by length Two-way Cycle feed pipe, because two-way feed pipe can separately send cold, separately control, such as, to when wherein a road feed pipe send cold, another road feed pipe can be closed down at any time, or to the salt solution of two-way feed pipe conveying different temperatures, can realize the segmentation of frost wall and control by stages, in whole freeze section work progress, frost wall intensity and thickness, Care in method and a rate of advance are coordinated, weak freezing is not frozen only, improve the safety of self well digging construction, the consumption of using electricity wisely loss and tubing, accomplish safe and reliable, economy.
In an embodiment more of the present utility model, the caliber of above-mentioned second feed pipe is greater than the caliber of described first feed pipe.
In an embodiment more of the present utility model, the sidewall of above-mentioned freezing pipe is also provided with liquid back pipe.
The third aspect, the utility model also provides a kind of Shaft Freezing system, and this Shaft Freezing system comprises: the frigo that Freezing Station unit and at least one above-mentioned first aspect provide, and the frigo that at least one above-mentioned second aspect provides; Wherein, described Freezing Station unit comprises outlet brine collecting ring and loop brine collecting ring, and described outlet brine collecting ring is connected with the feed pipe of described frigo, and described loop brine collecting ring is connected with the liquid back pipe of described frigo.Can realize the segmentation of frost wall due to above-mentioned frigo and/or control by stages, therefore each section of pit shaft freezing chilling requirement is demand by stages, can reduce a maximum demand of unit, unit is also just corresponding to be decreased.Meanwhile, due to Discrete control, accomplished each section of frost wall not weak freezing freeze only, therefore can be reduced energy consumption, saved electricity consumption and unit operation cost.
Accompanying drawing explanation
The frigo generalized section that Fig. 1 provides for the utility model one embodiment;
The frigo generalized section that Fig. 2 provides for the another embodiment of the utility model;
Fig. 3 is the utility model frigo generalized section of providing of an embodiment again;
The frigo that Fig. 4 provides for the utility model embodiment arranges schematic diagram in frozen construction;
Fig. 5 is the generalized section of Fig. 4.
Description of reference numerals:
10,20,30: frigo;
11,21,31: freezing pipe;
11a, 21a: top freezing pipe;
11b, 21b: bottom freezing pipe;
12,22,32: the first feed pipes;
13,23: reducing step;
14,24,34: base cone;
15,25,35: liquid back pipe;
26,36: the second feed pipes;
A: pit shaft;
B: inner ring hole;
C: via hole;
D: main hole;
R
a: pit shaft reducing position;
R
b: inner ring hole reducing position;
R
c: via hole reducing position;
R
d: master freezes reducing position, hole.
Detailed description of the invention
For making the purpose of this utility model, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the utility model embodiment, the technical solution of the utility model is clearly and completely described, obviously, described embodiment is a part of embodiment of the present utility model, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
The frigo generalized section that Fig. 1 provides for the utility model one embodiment.As shown in Figure 1, the frigo 10 that the present embodiment provides comprises freezing pipe 11, the first feed pipe 12 and base cone 14.
Concrete, freezing pipe 11 is made up of top freezing pipe 11a and bottom freezing pipe 11b, is communicated with between top freezing pipe 11a and bottom freezing pipe 11b by reducing step 13, and the caliber of top freezing pipe 11a is greater than the caliber of bottom freezing pipe 11b.Base cone 14 is connected with the bottom of bottom freezing pipe 11b.First feed pipe 12 is stretched into by the top mouth of pipe of top freezing pipe 11a, and extends to the bottom of bottom freezing pipe 11b.
Wherein, the caliber of top freezing pipe 11a and the caliber difference of bottom freezing pipe 11b, and the material adopted can be arranged according to the duty requirements of reality.As the optional embodiment of one, top freezing pipe 11a can select caliber to be the seamless steel pipe of 170mm, bottom freezing pipe 11b can select caliber to be the seamless steel pipe of 159mm, the modes such as welding can be adopted to be communicated with by reducing step 13 between the freezing pipe of top and the bottom, connecting portion due to top and the bottom freezing pipe belongs to stress concentration portion position, in the process of carrying out top and the bottom freezing pipe connection, some can be taked to strengthen treatment measures, such as, in welding process, a stirrup can be welded at reducing step place.First feed pipe, as cooling fluid conveyance conduit, can select caliber to be the rubber tube of 75mm.
As the optional embodiment of another kind, top freezing pipe 11a can also select caliber to be the seamless steel pipe of 159mm, and bottom freezing pipe 11b selects caliber to be the seamless steel pipe of 140mm.First feed pipe selects caliber to be the rubber tube of 60mm.
In actual applications, the choice of diameter of the first feed pipe should be mutually harmonious with the pipe diameter determing of freezing pipe, general warranty cold media mass-energy smooth circulation.
As one preferably embodiment, top freezing pipe 11a, bottom freezing pipe 11b and base cone 14 concentric are arranged, and preferably, base cone 14 is solid cone, feed pipe can stretch in the freezing pipe 11a of top along axle center, and extends to the bottom of bottom freezing pipe 11b.
In actual applications, the sidewall of top freezing pipe 11a is also provided with liquid back pipe 15, be appreciated that, feed pipe 12 continues in freezing pipe, inject sharp freezing liquid bottom freezing pipe 11, sharp freezing liquid in freezing pipe, after carrying out interchange of heat with frost wall, temperature can raise, when sharp freezing liquid continues the position being injected into liquid back pipe 15 place, the high temperature medium on top can be delivered to Freezing Station unit by the liquid back pipe 15 on the freezing pipe 11a sidewall of top, Freezing Station unit again obtains sharp freezing liquid after carrying out cooling process to it and uses for frozen construction, can realize freezing recycling of liquid in freezing pipe.
The frigo that the present embodiment provides is by arranging the reducing of top and the bottom freezing pipe, make salt solution different in the back-flow velocity of different parts, top salt solution back-flow velocity is little, lower return speed is large, thus makes the cryogenic temperature of outlet, top and the bottom salt solution produce difference, and freezing pipe external heat exchange area in top and the bottom is different simultaneously, freezing pipe is thin below, heat-exchange capacity is little, and top freezing pipe is thick, and heat-exchange capacity is strong.Therefore the Discrete control to frost wall can be realized, in whole freeze section work progress, frost wall intensity and thickness, Care in method and a rate of advance are coordinated, weak freezing is not frozen only, improve the safety of self well digging construction, the consumption of using electricity wisely loss and tubing, accomplishes safe and reliable, economy.
The frigo generalized section that Fig. 2 provides for the another embodiment of the utility model.As shown in Figure 2, the frigo 20 that the present embodiment provides, on basis embodiment illustrated in fig. 1, adds the second feed pipe 26.Concrete, the second feed pipe 26 stretches into from the top mouth of pipe of top freezing pipe 21a, and extends to reducing step 23 place.
Be appreciated that, the freezing pipe 21 of the frigo 20 that the present embodiment provides is made up of top freezing pipe 21a and bottom freezing pipe 21b, be communicated with by reducing step 23 between top freezing pipe 21a and bottom freezing pipe 21b, and the caliber of top freezing pipe 21a is greater than the caliber of bottom freezing pipe 21b.Base cone 24 is connected with the bottom of bottom freezing pipe 21b.First feed pipe 22 is stretched into by the top mouth of pipe of top freezing pipe 21a, and extends to the bottom of bottom freezing pipe 21b.
Preferably, top freezing pipe 21a, bottom freezing pipe 21b and base cone 24 concentric are arranged, and preferably, base cone 24 is solid cone, and feed pipe can stretch in freezing pipe 21 along axle center.
In order to ensure cold media mass-energy smooth circulation, one preferably embodiment is, the caliber of the second feed pipe 26 is greater than the caliber of the first feed pipe 22.
As the optional embodiment of one, top freezing pipe 21a can select caliber to be the seamless steel pipe of 170mm, and bottom freezing pipe 21b can select caliber to be the seamless steel pipe of 159mm, is communicated with in a welding manner between the freezing pipe of top and the bottom by reducing step 23.First feed pipe and the second feed pipe are as cooling fluid conveyance conduit, and in order to meeting spatial with return liquid requirement, optionally, the first feed pipe 22 can select caliber to be the rubber tube of 40mm, and the second feed pipe 26 selects caliber to be the rubber tube of 50mm.
In actual applications, the sidewall of top freezing pipe 21a is also provided with liquid back pipe 25, so that the circulation of salt solution in freezing pipe.
In actual applications, on the one hand, the first feed pipe 22 and the second feed pipe 26 can be fixed together by pipe clamp and put into freezing pipe 21 down simultaneously, also separately can transfer, first transfer the first feed pipe 22, after transfer the second feed pipe 26.On the other hand, first feed pipe 22 and the second feed pipe 26 can be arranged on and samely go on the salt solution brine collecting ring of loop, also can be separately mounted at and different go on the salt solution brine collecting ring of loop, to finely control brine temp, to the salt solution of two-way feed pipe conveying different temperatures.
The frigo 20 that the present embodiment provides is on the basis of the frigo 10 provided embodiment illustrated in fig. 1, add Two-way Cycle feed pipe to arrange, because two-way feed pipe can separately send cold, separately control, therefore not only can realize the Discrete control to frost wall, the control by stages to frost wall can also be realized.Such as, to when wherein a road feed pipe send cold, another road feed pipe can be closed down at any time, or the salt solution to two-way feed pipe conveying different temperatures.The frigo that the present embodiment provides can realize the segmentation of frost wall and control by stages, in whole freeze section work progress, frost wall intensity and thickness, Care in method and a rate of advance are coordinated, weak freezing is not frozen only, improve the safety of self well digging construction, the consumption of using electricity wisely loss and tubing, accomplishes safe and reliable, economy.
Fig. 3 is the utility model frigo generalized section of providing of an embodiment again.As shown in Figure 3, the frigo 30 that the present embodiment provides comprises freezing pipe 31, and the first feed pipe 32 and base cone 34 also comprise the second feed pipe 36.
Concrete, base cone 34 is connected with the bottom of freezing pipe 31, and the first feed pipe 32 is stretched into by the top mouth of pipe of freezing pipe 31, and extends to the bottom of freezing pipe 31; Second feed pipe 36 is stretched into by the top mouth of pipe of freezing pipe 31, and extends to the centre position of freezing pipe 31.
In order to ensure cold media mass-energy smooth circulation, one preferably embodiment is, the caliber of the second feed pipe 36 is greater than the caliber of the first feed pipe 32.
As the optional embodiment of one, freezing pipe 31 can select caliber to be the seamless steel pipe of 170mm, simultaneously in order to meeting spatial with return liquid requirement, the first feed pipe 32 can select caliber to be the rubber tube of 40mm, and the second feed pipe 36 can select caliber to be the rubber tube of 50mm.
As one preferably embodiment, freezing pipe 31 and base cone 34 concentric are arranged, and preferably, base cone 34 is solid cone.
In actual applications, on the one hand, the first feed pipe 32 and the second feed pipe 36 can be fixed together by pipe clamp and put into freezing pipe 31 down simultaneously, also separately can transfer, first transfer the first feed pipe 32, after transfer the second feed pipe 36.On the other hand, first feed pipe 32 and the second feed pipe 36 can be arranged on and samely go on the salt solution brine collecting ring of loop, also can be separately mounted at and different go on the salt solution brine collecting ring of loop, to finely control brine temp, to the salt solution of two-way feed pipe conveying different temperatures.
The frigo that the present embodiment provides is arranged by length Two-way Cycle feed pipe, because two-way feed pipe can separately send cold, separately control, such as, to when wherein a road feed pipe send cold, another road feed pipe can be closed down at any time, or to the salt solution of two-way feed pipe conveying different temperatures, can realize the segmentation of frost wall and control by stages, in whole freeze section work progress, frost wall intensity and thickness, Care in method and a rate of advance are coordinated, weak freezing is not frozen only, improve the safety of self well digging construction, the consumption of using electricity wisely loss and tubing, accomplish safe and reliable, economy.
For the feature and advantage of above-mentioned frigo can be become apparent, frozen construction embodiment cited below particularly, and coordinate accompanying drawing to elaborate.Obviously, described embodiment is schematic, but not determinate.
The frigo that Fig. 4 provides for the utility model embodiment arranges schematic diagram in frozen construction, and Fig. 5 is the generalized section of Fig. 4.Be appreciated that Fig. 4 and Fig. 5 is only used for schematically describing explanation.In actual Shaft Freezing construction, freezing hole design, freezing pipe reducing position are arranged, length feed pipe difference frozen position is arranged, all should repeatedly calculate in solution formulation according to factors such as pit shaft geological conditions and predict, ensure the construction safety of whole freeze section, sequential production requires and maximum economic technology benefit.Generally different according to frigo role, design content also difference to some extent.
Referring to Fig. 4 and Fig. 5, can relate to the freezing hole of three kinds, have inner ring hole B, via hole C and main hole D from inside to outside successively in Shaft Freezing construction according to the difference of pit shaft A cutting depth, different freezing hole handles surrounds corresponding dog collar.Pit shaft A is along with the continuous increase of cutting depth, and pit shaft also can reducing, as R in Fig. 5
ashown position is exactly pit shaft reducing position.
Master freezes the significant contributor that hole D is Frozen wall thickness and intensity, water shutoff effect is played at freeze section top (the general degree of depth is within 40m) and rock section, handle is formed and closes freezing curtain the earliest, therefore main design of freezing hole is generally shown native section and is not done variable diameter design, to ensure that frost wall has enough intensity and thickness, rock section can consider that Two-way Cycle feed pipe difference is freezed, and the continuous increase along with the degree of depth over vertical selects suitable position to do variable diameter design, as R in Fig. 5
dshown position is exactly the main reducing position freezing hole D.
Via hole C is that Frozen wall thickness and the strong of intensity supplement and strengthen, especially in key stratum position, Frozen wall thickness must ensure sufficient intensity and thickness, therefore the design of via hole can design according to the borehole wall geological condition detected in advance in Specific construction, and design the position that difference freezes, as R in Fig. 5 according to position, key stratum position etc.
cshown position is exactly the reducing position of via hole C.
Inner ring hole B is supplementing further Frozen wall thickness, reduce the average temperature of frost wall, reduce Care in method simultaneously, prevent wall caving and well side from producing the generation of the unsafe factors such as larger displacement, be for pick block work fast and safely carry out necessary guarantee is provided, therefore first the difference freeze design of inner ring hole should consider Care in method requirement, inner ring hole design is wanted to ensure that Care in method is suitable, wall caving, displacement of sidewall are not little, can not allow again frozen soil too much enter into the well heart, do not make the well heart freeze reality, realize only freezing yet not weak " digging the sugared heart " formula freezing efficiency frozen.As R in Fig. 5
bshown position is exactly the reducing position of inner ring hole B.
Be appreciated that in Specific construction, above-mentioned all kinds of freezing hole all can select the frigo adopting variable diameter design according to actual needs, or adopts the frigo of Two-way Cycle feed pipe design, or adopts the frigo of reducing and the design of Two-way Cycle feed pipe.
Based on the frigo that above-described embodiment provides, the utility model also provides a kind of Shaft Freezing system, comprises Freezing Station unit and at least one Fig. 1 or the frigo provided embodiment illustrated in fig. 2, and at least one frigo provided embodiment illustrated in fig. 3.
Concrete, Freezing Station unit comprises outlet brine collecting ring, freezing liquid circulator and loop brine collecting ring, outlet brine collecting ring is connected with the feed pipe of frigo, loop brine collecting ring is connected with the liquid back pipe of frigo, freezing liquid circulator is connected with outlet brine collecting ring and loop brine collecting ring respectively, for being the freezing liquid of low temperature by the high temp. salt water treatment in loop, and be delivered in freezing pipe by the feed pipe being connected to the frigo on the brine collecting ring of outlet.
The Shaft Freezing system that the utility model provides, the frigo adopted due to this Shaft Freezing system can realize the segmentation of frost wall and/or control by stages, therefore each section of pit shaft freezing chilling requirement is demand by stages, can reduce a maximum demand of unit, unit is also just corresponding to be decreased.Meanwhile, due to Discrete control, accomplished each section of frost wall not weak freezing freeze only, therefore can be reduced energy consumption, saved electricity consumption and unit operation cost.
Last it is noted that above each embodiment is only in order to illustrate the technical solution of the utility model, be not intended to limit; Although be described in detail the utility model with reference to foregoing embodiments, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein some or all of technical characteristic; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the scope of each embodiment technical scheme of the utility model.
Claims (9)
1. a frigo, is characterized in that, comprising: freezing pipe, the first feed pipe and base cone; Wherein,
Described freezing pipe is made up of top freezing pipe and bottom freezing pipe, is communicated with between described top freezing pipe and described bottom freezing pipe by reducing step, and the caliber of described top freezing pipe is greater than the caliber of described bottom freezing pipe; Described base cone is connected with the bottom of described bottom freezing pipe;
Described first feed pipe is stretched into by the top mouth of pipe of described top freezing pipe, and extends to the bottom of described bottom freezing pipe.
2. frigo according to claim 1, is characterized in that, also comprises:
Second feed pipe, described second feed pipe stretches into from the top mouth of pipe of described top freezing pipe, and extends to described reducing step place.
3. frigo according to claim 2, is characterized in that, the caliber of described second feed pipe is greater than the caliber of described first feed pipe.
4. the frigo according to any one of claim 1-3, is characterized in that, the sidewall of described top freezing pipe is also provided with liquid back pipe.
5. frigo according to claim 4, is characterized in that, described top freezing pipe, described bottom freezing pipe and described base cone concentric are arranged.
6. a frigo, is characterized in that, comprising: freezing pipe, the first feed pipe and base cone; Wherein, described base cone is connected with the bottom of described freezing pipe; Described first feed pipe is stretched into by the top mouth of pipe of described freezing pipe, and extends to the bottom of described freezing pipe;
Also comprise: the second feed pipe;
Described second feed pipe is stretched into by the top mouth of pipe of described freezing pipe, and extends to the centre position of described freezing pipe.
7. frigo according to claim 6, is characterized in that, the caliber of described second feed pipe is greater than the caliber of described first feed pipe.
8. the frigo according to claim 6 or 7, is characterized in that, the sidewall of described freezing pipe is also provided with liquid back pipe.
9. a Shaft Freezing system, is characterized in that, comprising: Freezing Station unit and at least one frigo described in any one of claim 1-5, and at least one frigo described in any one of claim 6-8; Wherein, described Freezing Station unit comprises outlet brine collecting ring and loop brine collecting ring, and described outlet brine collecting ring is connected with the feed pipe of described frigo, and described loop brine collecting ring is connected with the liquid back pipe of described frigo.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420745675.4U CN204283431U (en) | 2014-12-02 | 2014-12-02 | Frigo and Shaft Freezing system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420745675.4U CN204283431U (en) | 2014-12-02 | 2014-12-02 | Frigo and Shaft Freezing system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204283431U true CN204283431U (en) | 2015-04-22 |
Family
ID=52866605
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420745675.4U Expired - Fee Related CN204283431U (en) | 2014-12-02 | 2014-12-02 | Frigo and Shaft Freezing system |
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| Country | Link |
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| CN (1) | CN204283431U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104453911A (en) * | 2014-12-02 | 2015-03-25 | 淮南矿业(集团)有限责任公司 | Freezer and vertical shaft freezing system |
-
2014
- 2014-12-02 CN CN201420745675.4U patent/CN204283431U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104453911A (en) * | 2014-12-02 | 2015-03-25 | 淮南矿业(集团)有限责任公司 | Freezer and vertical shaft freezing system |
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Granted publication date: 20150422 Termination date: 20181202 |