CN206615814U - A kind of difunctional ship unloaders of spiral negative pressure - Google Patents
A kind of difunctional ship unloaders of spiral negative pressure Download PDFInfo
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- CN206615814U CN206615814U CN201621311516.9U CN201621311516U CN206615814U CN 206615814 U CN206615814 U CN 206615814U CN 201621311516 U CN201621311516 U CN 201621311516U CN 206615814 U CN206615814 U CN 206615814U
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- Prior art keywords
- spiral
- turret
- cantilever style
- dispenser
- negative pressure
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- 239000000463 material Substances 0.000 claims abstract description 41
- 238000007599 discharging Methods 0.000 claims abstract description 8
- 241001014327 Anodontia Species 0.000 claims abstract description 5
- 206010002583 anodontia Diseases 0.000 claims abstract description 5
- 230000005212 anodontia Effects 0.000 claims abstract description 5
- 239000011229 interlayer Substances 0.000 claims description 9
- 239000012530 fluid Substances 0.000 claims description 5
- 239000010410 layer Substances 0.000 claims description 4
- 238000005265 energy consumption Methods 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 239000000428 dust Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000005243 fluidization Methods 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Ship Loading And Unloading (AREA)
- Screw Conveyors (AREA)
- Rotary Pumps (AREA)
Abstract
The utility model discloses a kind of difunctional ship unloaders of spiral negative pressure, including fixed bearing platform, tilt cantilever style turret, multi-joint spiral unit, described fixed bearing platform upper port is provided with inclination cantilever style turret and turret drive device by ring flange, main pivoting support, the side charging aperture for tilting cantilever style turret is connected with multi-joint spiral unit by anodontia pivoting support, tilt cantilever style turret afterbody upper end open and material gas separating device is installed, the air outlet connection vavuum pump of material gas separating device；The described first segment screw machine of multi-joint spiral unit at the connector of second section screw machine with being provided with on-off switch valve, and one section of three-way pipe is installed above the dispenser of first segment screw machine, suction flexible pipe is installed, suction flexible pipe is communicated with material gas separating device on the side exit of three-way pipe；The discharging opening of described fixed bearing platform is provided with lock wind overflow spiral machine, and the port of export of lock wind overflow spiral machine is provided with telescopic vertical expects pipe.
Description
Technical field
The utility model is related to a kind of for inland river, the bulk powder shape of coastal dock or little grainy material machinery, gas
Power ship-unloading system, more particularly to a kind of difunctional ship unloaders of spiral negative pressure.
Background technology
Powdery and little grainy material water transport unloading field in bulk generally uses screw ship unloader at present, but also adopts
With negative-pressure ward ship unloaders.Two kinds of equipment have their own characteristics each.Spiral ship-unloading system is saved, noise is low, airborne dust is slight, productivity ratio
Height, Chinese patent CN205471765U discloses a kind of multi-joint without intermediate support screw ship unloader, and it uses angled cantilevered beams
It is combined with fluid bed, effectively eliminates the multiple trouble point of conventional helical ship unloaders, and improve operating efficiency, is reduced
Energy consumption, but it is similar with conventional helical ship unloaders, and after the completion of its work cabin bottom material surplus is more, it is impossible to accomplish without any letup
Unload net, bring down stocks workload big；And the similar dust catcher of negative pressure ship-unloading system, it can almost unload net to cabin bottom material, airborne dust is more
It is few, but low production efficiency, and noise is big, high energy consumption, and this machine is more applicable inland river small boat, to large-tonnage ship because of power
The overall targets such as its productivity ratio and energy consumption that weigh and apply seldom.
In order to which the effect of high-efficient energy-saving environment friendly unloading, and the purpose that the human-saving that time saving can save trouble completes to clear the ship can be reached,
Some harbours, as operation first, are unloaded frequently with screw ship unloader until changing in cabin during residue less than 20% by another negative pressure
Machine is performed and cleared the ship.This combination for respectively taking the chief is no doubt good, but invests larger, and dock work face area occupied is doubled,
Management increases with maintenance workload, so nor optimal selection.Best design is no more than the function spiral and negative pressure
Feature is uniformly integrated on a machine, allows its function can be with free switching as needed.Though but through expecting for many years, so far not yet
It is seen in market.
Utility model content
To solve deficiency of the prior art, the purpose of this utility model is to provide a kind of difunctional unloading of spiral negative pressure
Machine, it is intended to which solving existing screw ship unloader can not independently clear the ship, though negative pressure ship unloaders can independently bring down stocks high energy consumption, efficiency is low,
Such as with two kinds of equipment simultaneously using investing larger, the problem of dock work face also takes excessive, and release it is a kind of efficiently, energy-conservation,
Can independently clear the ship, reduce investment outlay again, place, management service expense, convenient use operation difunctional equipment.
To achieve the above object, the technical scheme is that：A kind of difunctional ship unloaders of spiral negative pressure, including fixation are held
Platform, inclination cantilever style turret, multi-joint spiral unit, described fixed bearing platform upper port pass through ring flange, main pivoting support
Inclination cantilever style turret and turret drive device are installed, the side charging aperture for tilting cantilever style turret passes through anodontia revolution
Support connection has a multi-joint spiral unit, the described minor details screw machine for tilting cantilever style turret and multi-joint spiral unit it
Between be connected with hoist cylinder, and tilt cantilever style turret afterbody upper end open and material gas separating device be installed, expect gas separating device
Air outlet connection vavuum pump；Dispenser is the sleeve pipe of tubular structure and the first segment screw machine installed in multi-joint spiral unit
On the flange of bottom, dispenser bottom is provided with the bottom plate with hole and fulcrum bearing, and is driven by spline housing connection in fulcrum bearing
Axle, drive shaft is located in the helical axis of first segment screw machine, and helical axis is connected independent motor, feeding with drive shaft respectively
The side axial of device is provided with two symmetrical charging apertures, the spiral of Archimedes type of the side of charging aperture radially flaring；Institute
The first segment screw machine of multi-joint spiral unit stated is with being provided with on-off switch valve at the connector of second section screw machine, and the
It is provided with above the dispenser of one section screw machine on one section of three-way pipe, the side exit of three-way pipe and suction flexible pipe, suction is installed
Flexible pipe is communicated with material gas separating device, and suction flexible pipe is fixed on multi-joint spiral unit outer wall；The discharging of described fixed bearing platform
Mouth is provided with lock wind overflow spiral machine, and the port of export of lock wind overflow spiral machine is provided with telescopic vertical expects pipe.
In order to improve the efficiency of negative pressure feeding, described dispenser top is provided with ring-type gas tank, ring-type gas tank and is provided with
Air inlet valve, the side axial of the dispenser of ring-type gas tank bottom is provided with two symmetrical charging apertures, and the side of charging aperture is radially
The spiral of Archimedes type of flaring, and the side of charging aperture is provided with the interlayer connected with ring-type gas tank, interlayer internal layer bottom is set
There is the exhaust vent of some connection dispenser inner chambers.
For the ease of the unloading of dispenser spiral or the unloading of dispenser negative pressure, more piece is provided with the charging aperture of described dispenser
Hinged door and hasp.
Preferably, described suction flexible pipe is passed through after tilting in cantilever style turret and being passed from its surface with expecting qi leel
From device side air inlet mouthful connection.
Preferably, described suction flexible pipe tail end directly connects inclination cantilever style turret outer end air inlet, material gas is mixed
Compound enters pan feeding gas separating device by inclination cantilever style turret afterbody upper end open.
In order to ensure the stationarity of structure, the described inclination cantilever style turret back side is provided with counterweight beam, described vacuum
Pump is installed in counterweight beam, and counterweight tail beam is hung with counterweight.
Further, described vavuum pump uses Roots vaccum pump, and is provided with muffler.
Realized to increase the mobility of material in light grade conveying function, described inclination cantilever style turret provided with stream
Change bed.
The beneficial effects of the utility model：Multipotency is various, is applicable to bulk powder shape or little grainy material discharging, energy
Perform bulk powder shape or little grainy material independently clears the ship without being cooperateed with by miscellaneous equipment, unloading operating efficiency is high, structure
Novelty, and save and use floor space, cost input is low；Negative pressure mechanism is optimized simultaneously, duct length is shortened so that bearing
Pressure clear the ship it is more efficient, consume energy it is lower.
Brief description of the drawings
Fig. 1 is the structure principle chart of embodiment 1 of the present utility model.
Fig. 2 is the side view of embodiment 1 of the present utility model.
Fig. 3 is the structure principle chart of embodiment 2 of the present utility model.
Fig. 4 is the side view of embodiment 2 of the present utility model.
Fig. 5 is the structural representation of the side view of dispenser of the present utility model.
Fig. 6 is the structural representation looked up of dispenser of the present utility model.
Embodiment
Embodiment 1,
As shown in Fig. 1,2,5,6, a kind of difunctional ship unloaders of spiral negative pressure, including fixed bearing platform 1, inclination cantilever style revolution
Tower 4, multi-joint spiral unit, the described upper port of fixed bearing platform 1 are provided with inclination cantilever by ring flange, main pivoting support 2
Type turret 4 and turret drive device 30, the side charging aperture for tilting cantilever style turret 4 are connected by anodontia pivoting support 27
There is multi-joint spiral unit, connect between described inclination cantilever style turret 4 and the minor details screw machine 29 of multi-joint spiral unit
Hoist cylinder 5 is connected to, and tilts the afterbody upper end open of cantilever style turret 4 and material gas separating device 10 is installed, gas separating device is expected
10 air outlet connection vavuum pump 11；The first segment screw machine 6 of described multi-joint spiral unit and the company of second section screw machine 7
Interface is provided with above on-off switch valve 8, and the dispenser of first segment screw machine 6 and is provided with one section of three-way pipe 9, three-way pipe 9
Side exit on suction flexible pipe 14 is installed, suction flexible pipe 14 is communicated with material gas separating device 10, and suction flexible pipe 14 is fixed on
Multi-joint spiral unit outer wall；The discharging opening of described fixed bearing platform 1 is provided with lock wind overflow spiral machine 15, locks wind overflow spiral
The port of export of machine 15 is provided with telescopic vertical expects pipe 16.
The described symmetrical side of inclination cantilever style turret 4 is provided with counterweight beam 13, and described vavuum pump 11 is installed on counterweight beam
On 13, and the tail end of counterweight beam 13 is hung with counterweight 28；Described vavuum pump 11 uses Roots vaccum pump, and is provided with muffler
12；Fluid bed 3 is provided with described inclination cantilever style turret 4；
Dispenser 17 is tubular structure and is arranged on the casing shoe flange of first segment screw machine 6, and the bottom of dispenser 17 is set
There are the bottom plate 23 with hole and fulcrum bearing 24, and drive shaft is connected by spline housing in fulcrum bearing 24, drive shaft is located at first
In the helical axis for saving screw machine 6, helical axis is connected independent motor with drive shaft respectively；The described top of dispenser 17 is set
Have and air inlet valve 19 is installed on ring-type gas tank 18, ring-type gas tank 18, the side axial of the dispenser 17 of the bottom of ring-type gas tank 18 is opened
There are two symmetrical charging apertures 20, the spiral of Archimedes type of the side of charging aperture 20 radially flaring, and charging aperture 20
Side is provided with the interlayer 21 connected with ring-type gas tank 18, and the internal layer bottom of interlayer 21 is provided with some connection dispenser 17 inner chambers31Go out
Air holes 22；Provided with more piece hinged door 25 and hasp 26 at the charging aperture 20 of described dispenser 17；
Described suction flexible pipe 14, which is passed through, to be tilted in cantilever style turret 4 and is passed from its surface rear with expecting gas separating device 10
Side air inlet mouthful connection.
The utility model is by tilting comprehensive covering of the cantilever style turret 4 with the realization of multi-joint spiral unit to cabin.
Ship time tentatively is unloaded, first starts each helical axis of multi-joint spiral unit and operates hydraulic-driven arm support to be unloaded.Break-make is opened
Close valve 8 to open, more piece hinged door 25 is opened, drive shaft drives dispenser 17 to rotate, and dispenser 17 is stretched into material, and material is through taking
The charging aperture 20 of glassware 17, which is included, to tilt cantilever style turret 4 through multi-joint spiral unit feeding, tilt cantilever style revolution
Fluid bed 3 is provided with tower 4, conveying material falls into fixed bearing platform 1 and exported through locking wind overflow spiral machine 15.
When clearing the ship, each helical axis and on-off switch valve 8 and hinged door 25 of multi-joint spiral unit are closed, feeding is kept
Device 17 rotates, and opens vavuum pump 11 and air inlet valve 19, and high velocity air enters interlayer 21 through air inlet valve 19 and is discharged into through exhaust vent 22
The inner chamber of dispenser 1731, now broken up into the material of dispenser 17 under high vacuum by the high velocity air from air inlet valve 19
Gasification, then arrived through three-way pipe 9 into suction flexible pipe 14 in glassware separator 10, gas is discharged by vavuum pump 11 after separation, material
Fixed bearing platform 1 is fallen into be sent out by lock wind overflow spiral machine 15.
The port of export of lock wind overflow spiral machine 15 is provided with telescopic vertical expects pipe 16, and material is full of longitudinal expects pipe 16
Afterwards, extruded by subsequent material, material is progressively pushed up to the discharging mouth of pipe, realize discharging, at the same time, will in longitudinal expects pipe 16
All the time there is material, therefore when material belongs to bulk powder shape or fine granularity, its material for being deposited in vertical expects pipe 16 rises
To material envelope effect；Longitudinal expects pipe 16 is scalable, is conveniently adjusted the height of materials in vertical expects pipe 16, it is ensured that its air-tightness.
Embodiment 2,
As shown in Fig. 3,4,5,6, a kind of difunctional ship unloaders of spiral negative pressure, including fixed bearing platform 1, inclination cantilever style revolution
Tower 4, multi-joint spiral unit, the described upper port of fixed bearing platform 1 are provided with inclining of communicating by ring flange, main pivoting support 2
Oblique cantilever style turret 4 is with turret drive device 30, and the side charging aperture for tilting cantilever style turret 4 passes through anodontia pivoting support
27 are connected with multi-joint spiral unit, the described minor details screw machine 29 for tilting cantilever style turret 4 and multi-joint spiral unit
Between be connected with hoist cylinder 5, and tilt the afterbody upper end open of cantilever style turret 4 and material gas separating device 10 be installed, expect gas
The air outlet connection vavuum pump 11 of separator 10；The first segment screw machine 6 of described multi-joint spiral unit and second section spiral
It is provided with the connector of machine 7 above on-off switch valve 8, and the dispenser of first segment screw machine 6 and one section of three-way pipe 9 is installed,
Suction flexible pipe 14 is installed, suction flexible pipe 14 is communicated with material gas separating device 10, and suction flexible pipe 14 on the side exit of three-way pipe 9
It is fixed on multi-joint spiral unit outer wall；The discharging opening of described fixed bearing platform 1 is provided with lock wind overflow spiral machine 15, and lock wind overflows
The port of export of stream screw machine 15 is provided with telescopic vertical expects pipe 16.
The described symmetrical side of inclination cantilever style turret 4 is provided with counterweight beam 13, and described vavuum pump 11 is installed on counterweight beam
On 13, and the tail end of counterweight beam 13 is hung with counterweight 28；Described vavuum pump 11 uses Roots vaccum pump, and is provided with muffler
12；Fluid bed 3 is provided with described inclination cantilever style turret 4；
Dispenser 17 is tubular structure and is arranged on the casing shoe flange of first segment screw machine 6, the bottom of dispenser 17
Drive shaft is connected provided with the bottom plate 23 with hole and fulcrum bearing 24, and by spline housing in fulcrum bearing 24, drive shaft is located at the
In the helical axis of one section screw machine 6, helical axis is connected independent motor with drive shaft respectively；The described top of dispenser 17
Provided with ring-type gas tank 18, air inlet valve 19, the side axial of the dispenser 17 of the bottom of ring-type gas tank 18 are installed on ring-type gas tank 18
It is provided with two symmetrical charging apertures 20, the spiral of Archimedes type of the side of charging aperture 20 radially flaring, and charging aperture 20
Side be provided with the interlayer 21 that connect with ring-type gas tank 18, the internal layer bottom of interlayer 21 connects the inner chambers 31 of dispenser 17 provided with some
Exhaust vent 22；Provided with more piece hinged door 25 and hasp 26 at the charging aperture 20 of described dispenser 17；
The described tail end of suction flexible pipe 14 directly connects the outer end air inlet of inclination cantilever style turret 4, material gas mixture by
Tilt the afterbody upper end open of cantilever style turret 4 and enter pan feeding gas separating device 10.
Some embodiments same as Example 1 are no longer repeated；
During clearing the ship, material gas mixture is drawn through suction flexible pipe 14 is first passed through inclination cantilever style turret 4, into inclination
After cantilever style turret 4, space becomes big, gas material speed rapid drawdown so that it is heavy through fluidisation that partial material drops naturally under gravity
Bed 3 flows into fixed bearing platform 1, and other material gas mixtures enter pan feeding gas separating device 10 by inclination cantilever style turret 4, after filtering again
Fixed bearing platform 1 is fallen into, the material-gas ratio that material gas separating device 10 enters medium is reduced, so that the power consumption reduction of vavuum pump 11, enhancing
Disposal ability.
The utility model has the dual-use function that spiral unloading clears the ship with negative pressure, improves operating efficiency, save cost with
Take up an area, while by unique structure of dispenser 17, negative pressure is improved again and is cleared the ship efficiency.
Preferred embodiment of the present utility model is the foregoing is only, it is all at this not to limit the utility model
Any modification, equivalent substitution or improvement made within the spirit and principle of utility model etc., should be included in the utility model
Protection domain within.
Claims (8)
1. a kind of difunctional ship unloaders of spiral negative pressure, including fixed bearing platform (1), inclination cantilever style turret (4), multi-joint spiral
Unit, described fixed bearing platform (1) upper port is provided with inclination cantilever style turret (4) by ring flange, main pivoting support (2)
With turret drive device (30), the side charging aperture for tilting cantilever style turret (4) is connected with by anodontia pivoting support (27)
Multi-joint spiral unit, it is characterised in that the minor details spiral of described inclination cantilever style turret (4) and multi-joint spiral unit
Be connected with hoist cylinder (5) between machine (29), and tilt cantilever style turret (4) afterbody upper end open and be provided with material qi leel from
Device (10), the air outlet connection vavuum pump (11) of material gas separating device (10)；Dispenser (17) is tubular structure and closed installed in morely
On the casing shoe flange for the first segment screw machine (6) for saving spiral unit, dispenser (17) bottom is provided with the bottom plate with hole
(23) with fulcrum bearing (24), and drive shaft is connected by fulcrum bearing (24)；Drive shaft is located at the helical axis of first segment screw machine (6)
Interior, helical axis is connected independent motor with drive shaft respectively, and the side axial of dispenser (17) is provided with two and symmetrically entered
Material mouth (20), the spiral of Archimedes type of the side of charging aperture (20) radially flaring；Described multi-joint spiral unit
First segment screw machine (6) at the connector of second section screw machine (7) with being provided with on-off switch valve (8), and first segment screw machine
(6) it is provided with above dispenser (17) on one section of three-way pipe (9), the side exit of three-way pipe (9) and suction flexible pipe is installed
(14), suction flexible pipe (14) is communicated with material gas separating device (10), and suction flexible pipe (14) is fixed on multi-joint spiral unit outer wall；
The discharging opening of described fixed bearing platform (1) is provided with lock wind overflow spiral machine (15), the port of export of lock wind overflow spiral machine (15)
Telescopic vertical expects pipe (16) is installed.
2. a kind of difunctional ship unloaders of spiral negative pressure according to claim 1, it is characterised in that described dispenser (17)
Top is provided with ring-type gas tank (18), ring-type gas tank (18) and is provided with air inlet valve (19), the dispenser of ring-type gas tank (18) bottom
(17) side axial is provided with two symmetrical charging apertures (20), Archimedes's spiral shell of the side of charging aperture (20) radially flaring
Spin line type, and the side of charging aperture (20) is provided with the interlayer (21) connected with ring-type gas tank (18), interlayer (21) internal layer bottom is set
There is the exhaust vent (22) of some connections dispenser (17) inner chamber (31).
3. a kind of difunctional ship unloaders of spiral negative pressure according to claim 1 or 2, it is characterised in that described dispenser
(17) charging aperture (20) place is provided with more piece hinged door (25) and hasp (26).
4. a kind of difunctional ship unloaders of spiral negative pressure according to claim 1, it is characterised in that described suction flexible pipe
(14) pass through after tilting in cantilever style turret (4) and being passed from its surface with expecting that gas separating device (10) side air inlet mouth is connected.
5. a kind of difunctional ship unloaders of spiral negative pressure according to claim 1, it is characterised in that described suction flexible pipe
(14) tail end directly connects inclination cantilever style turret (4) outer end air inlet, tilts cantilever style turret (4) afterbody upper end and opens
Mouth connection material gas separating device (10).
6. a kind of difunctional ship unloaders of spiral negative pressure according to claim 1 or 4 or 5, it is characterised in that described inclination
Fluid bed (3) is provided with cantilever style turret (4).
7. a kind of difunctional ship unloaders of spiral negative pressure according to claim 1, it is characterised in that described inclination cantilever style
Turret (4) symmetrical side is provided with counterweight beam (13), and described vavuum pump (11) is installed in counterweight beam (13), and counterweight beam (13)
Tail end is hung with counterweight (28).
8. a kind of difunctional ship unloaders of spiral negative pressure according to claim 1 or 7, it is characterised in that described vavuum pump
(11) Roots vaccum pump is used, and muffler (12) is installed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621311516.9U CN206615814U (en) | 2016-11-30 | 2016-11-30 | A kind of difunctional ship unloaders of spiral negative pressure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621311516.9U CN206615814U (en) | 2016-11-30 | 2016-11-30 | A kind of difunctional ship unloaders of spiral negative pressure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206615814U true CN206615814U (en) | 2017-11-07 |
Family
ID=60228788
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621311516.9U Withdrawn - After Issue CN206615814U (en) | 2016-11-30 | 2016-11-30 | A kind of difunctional ship unloaders of spiral negative pressure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206615814U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106429535A (en) * | 2016-11-30 | 2017-02-22 | 杭州三螺机械设备有限公司 | Spiral negative pressure dual-purpose ship unloader |
-
2016
- 2016-11-30 CN CN201621311516.9U patent/CN206615814U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106429535A (en) * | 2016-11-30 | 2017-02-22 | 杭州三螺机械设备有限公司 | Spiral negative pressure dual-purpose ship unloader |
| CN106429535B (en) * | 2016-11-30 | 2023-12-19 | 杭州三螺机械设备有限公司 | Spiral negative pressure dual-functional ship unloader |
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Granted publication date: 20171107 Effective date of abandoning: 20231219 |