CN106993491A - The ventilation unit and its operating method of a kind of warmhouse booth - Google Patents
The ventilation unit and its operating method of a kind of warmhouse booth Download PDFInfo
- Publication number
- CN106993491A CN106993491A CN201610859274.5A CN201610859274A CN106993491A CN 106993491 A CN106993491 A CN 106993491A CN 201610859274 A CN201610859274 A CN 201610859274A CN 106993491 A CN106993491 A CN 106993491A
- Authority
- CN
- China
- Prior art keywords
- ventilating opening
- magnet
- top pressure
- cover piece
- closed cover
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G9/00—Cultivation in receptacles, forcing-frames or greenhouses; Edging for beds, lawn or the like
- A01G9/24—Devices or systems for heating, ventilating, regulating temperature, illuminating, or watering, in greenhouses, forcing-frames, or the like
- A01G9/241—Arrangement of opening or closing systems for windows and ventilation panels
-
- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
- Y02A40/25—Greenhouse technology, e.g. cooling systems therefor
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- Life Sciences & Earth Sciences (AREA)
- Environmental Sciences (AREA)
- Air-Flow Control Members (AREA)
Abstract
The ventilation unit and its operating method of a kind of warmhouse booth, described device are used for greenhouse support body（9）In ventilating opening passage（90）Cover lid is carried out, including located at the greenhouse support body（9）Interior engagement mouthful（88）And it is inserted into the engagement mouth（88）Closed cover piece（8）, thus, when closed cover piece（8）Slide into the engagement mouth（88）When, the ventilating opening passage（90）It is closed, when closed cover piece（8）Slip away the engagement mouth（88）Ventilating opening between when, the ventilating opening passage（90）Allow air into, whole device of the present invention is reliable, drafting efficiency can be effectively improved, it is ensured that the crop in warmhouse booth can be within the optimum temperature range of growth.
Description
Technical field
The present invention relates to agriculture field, the ventilation unit and its operating method of specially a kind of warmhouse booth.
Background technology
Warmhouse booth planting technology, the greenhouse vegetable of particularly current north of china in winter are all being greatly developed in all parts of the country in recent years
Dish greenhouse enters large-scale production and planted gradually, and the ongoing operations of traditional warmhouse booth are relatively more, the daytime in northern winter
At noon, intensity of sunshine is than larger, and temperature-rise ratio is very fast in warmhouse booth, now, in order that the temperature in warmhouse booth is constant,
Need to be aerated ventilation to warmhouse booth and radiate, and when sun whereabouts to the west in afternoon, the temperature in warmhouse booth starts
Decline, need to close to the passage of warmhouse booth ventilation and radiating again, to ensure that the temperature inside warmhouse booth is constant.
Current traditional warmhouse booth various functions, which are substantially, manually to be operated to realize, labor intensity very big, efficiency is non-
It is often low.The keying of the wherein very ventilating opening of crucial warmhouse booth even more manually pulls rope to realize, efficiency is very
It is low, it is impossible to be accurately controlled the temperature in warmhouse booth, it is impossible to timely respond to the change of temperature in warmhouse booth, it is ensured that not temperature
Crop in the greenhouse of room can be within the optimum temperature range of growth.
The content of the invention
It is an object of the invention to provide a kind of ventilation unit of warmhouse booth and its operating method, for overcoming existing skill
Drawbacks described above in art.
According to the ventilation unit of the warmhouse booth of the present invention, for carrying out cover lid to the ventilating opening passage in greenhouse support body,
Including with the greenhouse support body be connected engagement mouth and be inserted into it is described engage mouth closed cover piece, thus, when closed
When cover piece slides into the engagement mouth, the ventilating opening passage is closed, described logical when closed cover piece slips away the engagement mouth
Air port passage is allowed air into, and supply fan is provided with the ventilating opening passage, the supply fan is to when described closed
Cover piece slip away it is described engagement mouth when improve drafting efficiency；Wherein, the closed cover piece is fixedly installed extends downwardly positioned at left side
Sliding panel, the end of the sliding panel be hinged with roller be used to being capable of up and down stretching motion by bottom top pressure spring
The left tilted surface and right tilted surface of double inclined plane top pressure drive block are engaged so as to respectively by the closed cover piece top pressure to open position
And closed position, the left surface of the sliding panel, which is provided with the ventilating opening including being set respectively on fore-and-aft direction, to be opened and uses preceding magnet
With the ventilating opening opening magnet assembly of rear magnet, the right flank of the sliding panel is provided with including being set respectively on fore-and-aft direction
Ventilating opening close with preceding magnet and the ventilating opening closing magnet assembly of rear magnet, set in the greenhouse support body in left position
Have including front and rear arrangement, beaten slidably and with preceding magnet and the corresponding ventilating opening of rear magnet to be opened with the ventilating opening respectively
Open and set in the ventilating opening opening electromagnetic coil assembly with preceding magnet coil and rear magnet coil, the greenhouse support body in right position
It is equipped with including front and rear arrangement, respectively slidably and to be closed with the ventilating opening with preceding magnet and the corresponding ventilating opening of rear magnet
Close with preceding magnet coil and the ventilating opening closing electromagnetic coil assembly of rear magnet coil；The ventilating opening opening electromagnetic wire
Coil assembly and ventilating opening closing with electromagnetic coil assembly when lower electric by respective extension spring act on and in retracted mode from
And the motion of the closed cover piece is avoided interference with, and slack adjuster is provided with the double inclined plane top pressure drive block, it is described elastic
Adjusting means is including the elastic motor being fixedly connected with the double inclined plane top pressure drive block, slide-and-guide cavity and is arranged on institute
The elastic sliding block in slide-and-guide cavity is stated, the elastic slider bottom is fixedly connected with the top pressure spring, the slip is led
It is embedded in cavity inside both sides provided with groove, the elastic sliding block two ends are oriented in the guiding groove and sliding connection,
The elastic slider top is installed with elastic screw rod, and the elastic screw tip is provided with the screw shell that screw thread is connected, institute
State to be rotatably assorted with the elastic motor at the top of screw shell and be connected, the slack adjuster is to adjust the top pressure spring
Elasticity, the elastic motor is connected sides adjacent with the double inclined plane top pressure drive block provided with cushion blocking, and the cushion blocking is used
To improve the elastic motor operation stability.
According to the present invention, the operating method of the ventilation unit of above-mentioned warmhouse booth, when needing to perform ventilating opening opening operation
When, the ventilating opening opening is with electricity on electromagnetic coil assembly so as in stretching state and attract the closed cover piece to slide to the left
So that the roller is engaged with the left tilted surface, afterwards under the ventilating opening opening electromagnetic coil assembly electricity and in retraction shape
State, the closed cover piece is locked in open mode by top pressure in the presence of the left tilted surface of the double inclined plane top pressure drive block；When
When needing to perform ventilating opening shutoff operation, electricity on the ventilating opening closing electromagnetic coil assembly is so as to be in stretching state and inhale
Draw the closed cover piece to slide to the right so that the roller is engaged with the right tilted surface, afterwards the ventilating opening closing electromagnetic wire
Electricity under coil assembly and in retracted mode, the closed cover piece quilt in the presence of the right tilted surface of the double inclined plane top pressure drive block
Top pressure is locked in off position.
In the device of the present invention, due to by performing the slide function for closed cover piece, thus, it is possible to need not
Ventilating opening passage plugging outside air is entered in greenhouse in the state of ventilation, beaten while being able to ensure that in the state of it need to divulge information
Closed cover piece is opened to be aerated.And present invention employs the Electromagnetically-operating coil of left and right sides distribution and double inclined plane top pressure sliding block
The pattern being engaged, thus, it is possible to which while ensuring closed cover piece remaining positioned in fixed expectation state, electricity can be shortened
The distance of magnetic coil and corresponding magnet is so that it is guaranteed that the validity of Electromagnetically-operating and improve attraction.
Brief description of the drawings
Fig. 1 is the overlooking structural representation of the ventilation unit of the warmhouse booth of the present invention.
Fig. 2 is the B-B cross section structure diagrams of device in Fig. 1, illustrated therein is slip grid and is closed.
Fig. 3 is that the device in Fig. 2 is sliding the view that grid are in opening procedure, and now roller connects with left tilted surface
Close and the opening not yet lower electricity of magnet coil.
Fig. 4 is the schematic cross-sectional view of A-A in Fig. 1.
Embodiment
With reference to Fig. 1-4, the present invention is described in detail.
The ventilation unit of warmhouse booth according to an embodiment of the invention, for the ventilating opening passage in greenhouse support body 9
90 carry out cover lids, including engagement mouth 88 in the greenhouse support body 9 and are inserted into described engaging the closed of mouth 88
Cover piece 8, thus, when closed cover piece 8 slides into the engagement mouth 88, the ventilating opening passage 90 is closed, when closed cover piece 8
Slip away the engagement mouth 88 when, the ventilating opening passage 90 is allowed air into, and air inlet wind is provided with the ventilating opening passage 90
Fan 91, the supply fan 91 when the closed cover piece 8 slips away the engagement mouth 88 to improve drafting efficiency；Wherein, institute
State closed cover piece 8 and be fixedly installed the sliding panel 83 extended downwardly positioned at left side, the end of the sliding panel 83 is hinged with roller
84 be used to by bottom top pressure spring 79 can up and down stretching motion double inclined plane top pressure drive block 7 left tilted surface 72 and the right side
Inclined-plane 71 is engaged so as to respectively by the closed top pressure of cover piece 8 to open position and closed position, the sliding panel 83
Left surface is provided with the ventilating opening opening including being set respectively on fore-and-aft direction and beaten with the ventilating opening of preceding magnet 821 and rear magnet 82
Open and use magnet assembly, the right flank of the sliding panel 83 is provided with the ventilating opening including being set respectively on fore-and-aft direction and closed before use
It is provided with the ventilating opening closing magnet assembly of magnet and rear magnet 81, the greenhouse support body 9 in left position including front and rear cloth
Put, respectively slidably and to be opened with the ventilating opening with before preceding magnet 821 and the corresponding ventilating opening of rear magnet 82 opening use
Set in the ventilating opening opening electromagnetic coil assembly of magnet coil 621 and rear magnet coil 62, the greenhouse support body 9 in right position
It is equipped with including front and rear arrangement, respectively slidably and to be divulged information with ventilating opening closing with preceding magnet and rear magnet 81 are corresponding
Mouth is closed with preceding magnet coil 611 and the ventilating opening closing electromagnetic coil assembly of rear magnet coil 61；The ventilating opening is opened
Acted on electromagnetic coil assembly and ventilating opening closing with electromagnetic coil assembly by respective extension spring and in contracting when lower electric
The state of returning is provided with slack adjuster so as to avoid interference with the motion of the closed cover piece 8, the double inclined plane top pressure drive block 7
101, the slack adjuster 101 includes elastic motor 103, the slip being fixedly connected with the double inclined plane top pressure drive block 7
Be oriented to cavity 102 and the elastic sliding block 106 that is arranged in the slide-and-guide cavity 102, the elastic bottom of sliding block 106 with
The top pressure spring 79 is fixedly connected, and the inside both sides of slide-and-guide cavity 102 are provided with guiding groove 107, the elastic cunning
The two ends of block 106 are embedded in the guiding groove 107 and sliding connection, and the elastic top of sliding block 106 is installed with elastic spiral shell
Bar 105, the screw shell 104 that the top of elastic screw rod 105 is connected provided with screw thread, the top of screw shell 104 with
The elastic motor 103 is rotatably assorted connection, and the slack adjuster 101 is to adjust the elastic of the top pressure spring 79
Degree, the elastic motor 103 is connected sides adjacent with the double inclined plane top pressure drive block 7 provided with cushion blocking 108, the cushion blocking
108 to improve the operation stability of elastic motor 103.
Reference picture 4, exemplarily or valuably, wherein, the ventilating opening closing magnet assembly and ventilating opening, which are closed, to be used
Being each mounted on respective scaling operation component in electromagnetic coil assembly, before each scaling operation component includes
Rear to the preceding wedge block 511 and rear wedge block 51 being provided separately to respectively with for magnet coil be connected, it is described
The bottom of preceding wedge block 511 and rear wedge block 51 is respectively arranged with preceding sucking coil 52 and rear sucking coil 51 is used to and top
Preceding attraction magnet 311 and rear attraction magnet 31 on the wedge-shaped arm operating parts 3 of pressure are corresponded to respectively, the preceding sucking coil 52 and rear suction
It is electric lead circle 51 is synchronous with corresponding one in ventilating opening closing magnet assembly and ventilating opening closing electromagnetic coil assembly,
So as to which the wedge-shaped arm operating parts 3 of the top pressure is attracted into motion upwards, pass through two wedge-shaped arms of the wedge-shaped arm operating parts 3 of the top pressure
Respectively with the effect of the preceding wedge block 511 and rear wedge block 51 and cause corresponding electromagnetic coil assembly to overcome respective
Extension spring is acted on and stretched out by top pressure.
According to embodiment, the operating method of the ventilation unit of above-mentioned warmhouse booth, when needing to perform ventilating opening opening operation
When, the ventilating opening opening is with electricity on electromagnetic coil assembly so as in stretching state and attract the closed cover piece 8 to slide to the left
It is dynamic that the roller 84 is engaged with the left tilted surface 72, it is electric under the ventilating opening opening electromagnetic coil assembly afterwards and be in
Retracted mode, the closed cover piece 8 is locked in by top pressure and beaten in the presence of the left tilted surface 72 of the double inclined plane top pressure drive block 7
Open state；When needing to perform ventilating opening shutoff operation, electricity is stretched so as to be on the ventilating opening closing electromagnetic coil assembly
Do well and attract the closed cover piece 8 to slide to the right so that the roller 84 is engaged with the right tilted surface 71, it is described afterwards logical
Electricity under air port closing electromagnetic coil assembly and in retracted mode, in the right tilted surface 71 of the double inclined plane top pressure drive block 7
The closed cover piece 8 is locked in off position by top pressure under effect.
Due to by performing the slide function for closed cover piece, thus, it is possible to lead in the state of without ventilation
Air port passage plugging outside air enters in greenhouse, is led to while being able to ensure that in the state of it need to divulge information and opening closed cover piece
Wind.And present invention employs the pattern that is engaged with double inclined plane top pressure sliding block of Electromagnetically-operating coil of left and right sides distribution, by
This can shorten magnet coil and corresponding magnetic while ensuring closed cover piece remaining positioned in fixed expectation state
The distance of body is so that it is guaranteed that the validity and raising attraction of Electromagnetically-operating.Whole device is reliable, can effectively improve logical
Wind efficiency, it is ensured that the crop in warmhouse booth can be within the optimum temperature range of growth.
Those skilled in the art can be clear and definite, can in the case of the overall spirit of the present invention and design is not departed from
To make the various modifications for above example.It is each fallen within protection scope of the present invention.The protection scheme of the present invention
It is defined by claims appended hereto.
Claims (3)
1. a kind of ventilation unit of warmhouse booth, for greenhouse support body（9）In ventilating opening passage（90）Cover lid is carried out, including
Located at the greenhouse support body（9）Interior engagement mouthful（88）And it is inserted into the engagement mouth（88）Closed cover piece（8）, by
This, when closed cover piece（8）Slide into the engagement mouth（88）When, the ventilating opening passage（90）It is closed, when closed cover piece（8）
Slip away the engagement mouth（88）When, the ventilating opening passage（90）Allow air into, the ventilating opening passage（90）Inside it is provided with
Supply fan（91）, the supply fan（91）To when the closed cover piece（8）Slip away the engagement mouth（88）Shi Tigao leads to
Wind efficiency；Wherein, the closed cover piece（8）It is fixedly installed the sliding panel extended downwardly positioned at left side（83）, the sliding panel
（83）End be hinged with roller（84）To with by bottom top pressure spring（79）And can up and down stretching motion double inclined plane
Top pressure drive block（7）Left tilted surface（72）And right tilted surface（71）Engagement is so as to respectively by the closed cover piece（8）Top pressure is extremely
Open position and closed position, the sliding panel（83）Left surface be provided with the ventilating opening including being set respectively on fore-and-aft direction
Opening uses preceding magnet（821）With rear magnet（82）Ventilating opening opening magnet assembly, the sliding panel（83）Right flank set
The ventilating opening including setting respectively on fore-and-aft direction is equipped with to close with preceding magnet and rear magnet（81）Ventilating opening closing magnet
Component, the greenhouse support body（9）In be provided with left position including it is front and rear arrangement, respectively slidably and be used to and the ventilating opening
Opening uses preceding magnet（821）With rear magnet（82）Corresponding ventilating opening is opened and uses preceding magnet coil（621）With rear magnet coil
（62）Ventilating opening opening electromagnetic coil assembly, the greenhouse support body（9）In be provided with right position including it is front and rear arrangement, point
Not slidably and to be closed with the ventilating opening with preceding magnet and rear magnet（81）Corresponding ventilating opening is closed and uses preceding electromagnetic wire
Circle（611）With rear magnet coil（61）Ventilating opening closing electromagnetic coil assembly；The ventilating opening opening magnet coil group
Part and ventilating opening closing are acted on when lower electric with electromagnetic coil assembly by respective extension spring and in retracted mode so as to keeping away
Exempt from the interference closed cover piece（8）Motion, the double inclined plane top pressure drive block（7）It is interior to be provided with slack adjuster（101）, institute
State slack adjuster（101）Including with the double inclined plane top pressure drive block（7）The elastic motor being fixedly connected（103）, slide
It is oriented to cavity（102）And it is arranged on the slide-and-guide cavity（102）Interior elastic sliding block（106）, the elastic sliding block
（106）Bottom and the top pressure spring（79）It is fixedly connected, the slide-and-guide cavity（102）Internal both sides are provided with guiding groove
（107）, the elastic sliding block（106）Two ends are embedded in the guiding groove（107）Interior and sliding connection, the elastic sliding block
（106）Top is installed with elastic screw rod（105）, the elastic screw rod（105）Top is provided with the screw shell that screw thread is connected
（104）, the screw shell（104）Top and the elastic motor（103）Be rotatably assorted connection, the slack adjuster
（101）To adjust the top pressure spring（79）Elasticity, the elastic motor（103）With the double inclined plane top pressure drive block
（7）Connect sides adjacent and be provided with cushion blocking（108）, the cushion blocking（108）To improve the elastic motor（103）It is stable
Property.
2. a kind of ventilation unit of warmhouse booth as claimed in claim 1, wherein, ventilating opening the closings magnet assembly with
Ventilating opening closing is with being each mounted on respective scaling operation component in electromagnetic coil assembly, each scaling operation
Component includes the preceding wedge block that fore-and-aft direction is provided separately（511）With rear wedge block（51）To respectively with for electricity
Magnetic coil is connected, the preceding wedge block（511）With rear wedge block（51）Bottom be respectively arranged with preceding sucking coil（52）
With rear sucking coil（51）To with the wedge-shaped arm operating parts of top pressure（3）On preceding attraction magnet（311）With rear attraction magnet（31）
Correspond to respectively, the preceding sucking coil（52）With rear sucking coil（51）Closed with ventilating opening closing magnet assembly and ventilating opening
With in electromagnetic coil assembly in a corresponding synchronization it is electric so that by the wedge-shaped arm operating parts of the top pressure（3）Attract motion upwards,
Pass through the wedge-shaped arm operating parts of the top pressure（3）Two wedge-shaped arms respectively with the preceding wedge block（511）With rear wedge block
（51）Effect and cause corresponding electromagnetic coil assembly to overcome respective extension spring to act on and stretched out by top pressure.
3. a kind of operating method of the ventilation unit of warmhouse booth as claimed in claim 1 or 2, beats when needing execution ventilating opening
When opening operation, electricity on the ventilating opening opening electromagnetic coil assembly is so as to be in stretching state and attract the closed cover piece
（8）Slide to the left and cause the roller（84）With the left tilted surface（72）Engage, afterwards the ventilating opening opening magnet coil
Electricity under component and in retracted mode, in the double inclined plane top pressure drive block（7）Left tilted surface（72）In the presence of it is described closed
Cover piece（8）Open mode is locked in by top pressure；When needing to perform ventilating opening shutoff operation, the ventilating opening closing electromagnetic wire
Electricity on coil assembly is so as to be in stretching state and attract the closed cover piece（8）Slide to the right and cause the roller（84）With it is described
Right tilted surface（71）Engagement, afterwards under the ventilating opening closing electromagnetic coil assembly electricity and in retracted mode, in the diclinic
Face top pressure drive block（7）Right tilted surface（71）In the presence of the closed cover piece（8）By top pressure locking in off position.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610859274.5A CN106993491A (en) | 2016-09-29 | 2016-09-29 | The ventilation unit and its operating method of a kind of warmhouse booth |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610859274.5A CN106993491A (en) | 2016-09-29 | 2016-09-29 | The ventilation unit and its operating method of a kind of warmhouse booth |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106993491A true CN106993491A (en) | 2017-08-01 |
Family
ID=59431753
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610859274.5A Pending CN106993491A (en) | 2016-09-29 | 2016-09-29 | The ventilation unit and its operating method of a kind of warmhouse booth |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106993491A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203943339U (en) * | 2014-05-19 | 2014-11-19 | 合肥永威机械设备有限责任公司 | Dual-purpose universal wheel |
| CN104863438A (en) * | 2014-03-25 | 2015-08-26 | 北汽福田汽车股份有限公司 | Vehicle door handle covering device and vehicle comprising same |
| CN104916983A (en) * | 2015-05-11 | 2015-09-16 | 方星 | Power supply device with dehumidifying function and use method thereof |
| CN204742044U (en) * | 2015-07-24 | 2015-11-11 | 重庆留辉农业有限公司 | Warmhouse booth ventilating fan |
| CN204960556U (en) * | 2015-08-13 | 2016-01-13 | 苏州汇久自动化设备有限公司 | Interconnected lock of explosion -proof pneumatics |
| CN205281884U (en) * | 2015-12-17 | 2016-06-01 | 武汉东湖学院 | Teaching classroom over -and -under type teaching aid clamping device |
-
2016
- 2016-09-29 CN CN201610859274.5A patent/CN106993491A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104863438A (en) * | 2014-03-25 | 2015-08-26 | 北汽福田汽车股份有限公司 | Vehicle door handle covering device and vehicle comprising same |
| CN203943339U (en) * | 2014-05-19 | 2014-11-19 | 合肥永威机械设备有限责任公司 | Dual-purpose universal wheel |
| CN104916983A (en) * | 2015-05-11 | 2015-09-16 | 方星 | Power supply device with dehumidifying function and use method thereof |
| CN204742044U (en) * | 2015-07-24 | 2015-11-11 | 重庆留辉农业有限公司 | Warmhouse booth ventilating fan |
| CN204960556U (en) * | 2015-08-13 | 2016-01-13 | 苏州汇久自动化设备有限公司 | Interconnected lock of explosion -proof pneumatics |
| CN205281884U (en) * | 2015-12-17 | 2016-06-01 | 武汉东湖学院 | Teaching classroom over -and -under type teaching aid clamping device |
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20170801 |
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