CN110342388B - Method and device for adjusting gravity center position of wind driven generator blade - Google Patents

Method and device for adjusting gravity center position of wind driven generator blade Download PDF

Info

Publication number
CN110342388B
CN110342388B CN201910667297.XA CN201910667297A CN110342388B CN 110342388 B CN110342388 B CN 110342388B CN 201910667297 A CN201910667297 A CN 201910667297A CN 110342388 B CN110342388 B CN 110342388B
Authority
CN
China
Prior art keywords
blade
counterweight
gravity
driven generator
wind driven
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.)
Active
Application number
CN201910667297.XA
Other languages
Chinese (zh)
Other versions
CN110342388A (en
Inventor
王国军
高建宏
李海涛
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shanghai Electric Wind Power Group Co Ltd
Original Assignee
Shanghai Electric Wind Power Group Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Shanghai Electric Wind Power Group Co Ltd filed Critical Shanghai Electric Wind Power Group Co Ltd
Priority to CN201910667297.XA priority Critical patent/CN110342388B/en
Publication of CN110342388A publication Critical patent/CN110342388A/en
Application granted granted Critical
Publication of CN110342388B publication Critical patent/CN110342388B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C1/00—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles
    • B66C1/10—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles by mechanical means
    • B66C1/108—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles by mechanical means for lifting parts of wind turbines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C13/00—Other constructional features or details
    • B66C13/04—Auxiliary devices for controlling movements of suspended loads, or preventing cable slack
    • B66C13/08—Auxiliary devices for controlling movements of suspended loads, or preventing cable slack for depositing loads in desired attitudes or positions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D13/00—Assembly, mounting or commissioning of wind motors; Arrangements specially adapted for transporting wind motor components
    • F03D13/10—Assembly of wind motors; Arrangements for erecting wind motors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
    • F16F15/28—Counterweights, i.e. additional weights counterbalancing inertia forces induced by the reciprocating movement of masses in the system, e.g. of pistons attached to an engine crankshaft; Attaching or mounting same
    • 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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/72—Wind turbines with rotation axis in wind direction

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Wind Motors (AREA)

Abstract

A method and a device for adjusting the gravity center position of a blade of a wind driven generator are provided, wherein a matching point is determined on the blade of the wind driven generator to be hoisted, a liquid counterweight device is arranged on the matching point, the liquid counterweight device is a built-in counterweight device arranged inside the blade of the wind driven generator or an external counterweight device arranged outside the blade of the wind driven generator, and the gravity center position of the blade of the wind driven generator to be hoisted is adjusted to the blade gravity center position required by a single-blade hoisting tool by adjusting the mass of counterweight liquid in the liquid counterweight device. The invention greatly improves the universality of the single-blade lifting appliance, improves the use efficiency of the single-blade lifting appliance, accelerates the development progress of a unit and reduces the lifting and amortizing cost of the blades.

Description

Method and device for adjusting gravity center position of wind driven generator blade
Technical Field
The invention relates to a method and a device for adjusting the gravity center position of a wind driven generator blade.
Background
With the large-scale development of wind generating sets, the blades of wind turbines are longer and heavier, the impeller is hoisted gradually in a mode of integrally hoisting the impeller and the blades into single-blade hoisting, and particularly for large offshore wind generating sets, the single-blade hoisting tool is basically a standard configuration applied to unit hoisting engineering. In the single-blade hoisting process at the present stage, the relative position of the clamping point of the clamping jaw of the hoisting tool and the gravity center point of the blade is of great importance, and the clamping surface of the clamping jaw needs to be shaped along with the pneumatic appearance of the blade, so that the hoisting tool designed for a certain blade with the determined pneumatic appearance and the determined structural gravity center position can only be suitable for the blade. If the shape of the blade is kept unchanged, the internal structure of the blade is adjusted according to different wind resource working conditions, the gravity center position of the blade is changed, the lifting appliance is not suitable for the blade with the gravity center position changed, and the matching of the clamping jaw of the lifting appliance and the blade needs to be redesigned. The replacement cost of the clamping jaw of the single-blade lifting appliance is up to several million yuan, so that the development cost and the lifting cost of a unit are greatly increased, the universality of the single-blade lifting appliance is poor, and the use efficiency of the single-blade lifting appliance is reduced.
Disclosure of Invention
The invention provides a method and a device for adjusting the gravity center position of a blade of a wind driven generator, which greatly improve the universality of a single-blade lifting appliance, improve the use efficiency of the single-blade lifting appliance, accelerate the development progress of a unit and reduce the lifting and amortization cost of the blade.
In order to achieve the above object, the present invention provides a method for adjusting the position of the center of gravity of a wind turbine blade, comprising the steps of: determining a matching point on the wind driven generator blade to be hoisted, arranging a liquid counterweight device on the matching point, and adjusting the gravity center position of the wind driven generator blade to be hoisted to the blade gravity center position required by a single-blade hoisting tool by adjusting the mass of counterweight liquid in the liquid counterweight device.
The counterweight points comprise blade root position counterweight points and blade tip position counterweight points, the blade root position counterweight points refer to the counterweight points in the range from the blade root to the blade gravity center position required by the single-blade lifting appliance, and the blade tip position counterweight points refer to the counterweight points in the range from the blade gravity center position required by the single-blade lifting appliance to the blade tip.
If the gravity center position of the wind driven generator blade to be hoisted is close to the blade root compared with the gravity center position required by a single-blade lifting appliance, the counterweight point is set as a blade tip position counterweight point, and the liquid counterweight device is set at the blade tip position counterweight point.
If the gravity center position of the wind driven generator blade to be hoisted is close to the blade tip compared with the gravity center position required by a single-blade lifting appliance, the counterweight point is set as a blade root position counterweight point, and the liquid counterweight device is set at the blade root position counterweight point.
After the wind driven generator blade with the gravity center position adjusted is installed on the wind driven generator impeller, the counterweight liquid in the liquid counterweight device is discharged, and the wind driven generator blade restores the original weight and the gravity center position.
The invention also provides a liquid counterweight device which is a built-in counterweight device arranged inside the blade of the wind driven generator or an external counterweight device arranged outside the blade of the wind driven generator.
The built-in counterweight device comprises: the hollow cavity is arranged inside the wind driven generator blade shell and provided with an opening, and a sealing piece is arranged on the opening.
The hollow cavity is made of glass fiber reinforced plastic materials.
The external counterweight device comprises: the elastic container is arranged outside the wind driven generator blade shell and provided with an inner cavity, the elastic container is provided with an opening, and a sealing piece is arranged on the opening.
The elastic container is made of rubber materials.
Under the conditions of small blade design change and low engineering application operation difficulty, the universality of the single-blade lifting appliance is greatly improved, the convenience of field construction is considered, and a solution for engineering application is provided for improving the use efficiency of the single-blade lifting appliance, accelerating the development progress of a unit and reducing the lifting and amortization cost of the blades.
Drawings
FIG. 1 is a flow chart of a method for adjusting the position of the center of gravity of a wind turbine blade according to the present invention.
Fig. 2 is a schematic structural view of a liquid counterweight device in a first embodiment of the invention.
Fig. 3 is a partially enlarged schematic view of a portion a in fig. 2.
Fig. 4 is a schematic structural view of a liquid counterweight device in a second embodiment of the invention.
Fig. 5 is a schematic structural view of the rubber ring in fig. 4.
Detailed Description
The preferred embodiment of the present invention will be described in detail below with reference to fig. 1 to 5.
As shown in FIG. 1, the present invention provides a method for adjusting the center of gravity of a wind turbine blade, comprising the following steps: the method comprises the steps of taking the center of gravity position of a blade required by an existing single-blade lifting appliance as a standard, determining a distribution point on the blade of the wind driven generator to be lifted, setting a liquid counterweight device on the distribution point, adjusting the center of gravity position of the blade of the wind driven generator to be lifted to the center of gravity position of the blade required by the single-blade lifting appliance by adjusting the mass of counterweight liquid in the liquid counterweight device, then lifting the blade of the wind driven generator to be lifted, which is adjusted to the center of gravity position, by using the single-blade lifting appliance, discharging the counterweight liquid in the liquid counterweight device after the blade of the wind driven generator, which is adjusted to the center of gravity position, is installed on an impeller of the wind driven generator, and enabling the blade of the wind driven generator to recover.
The counterweight points comprise blade root position counterweight points and blade tip position counterweight points, the blade root position counterweight points refer to the counterweight points in the range from the blade root to the blade gravity center position required by the single-blade lifting appliance, and the blade tip position counterweight points refer to the counterweight points in the range from the blade gravity center position required by the single-blade lifting appliance to the blade tip.
If the center of gravity position of the wind driven generator blade to be hoisted is close to the blade root compared with the center of gravity position required by the single-blade lifting appliance, the counterweight point is set to be the tip position configuration point, the liquid counterweight device is set to the tip position counterweight point, counterweight liquid is added into the liquid counterweight device, and the center of gravity position of the wind driven generator blade to be hoisted is adjusted to the blade center of gravity position required by the single-blade lifting appliance. And then, hoisting the wind driven generator blade to be hoisted, the gravity center position of which is adjusted, by using a single-blade hoisting tool, installing the wind driven generator blade, the gravity center position of which is adjusted, on an impeller of the wind driven generator, and then discharging the counterweight liquid in the liquid counterweight device to restore the original weight and gravity center position of the wind driven generator blade.
If the center of gravity position of the wind driven generator blade to be hoisted is close to the blade tip compared with the center of gravity position required by the single-blade lifting appliance, the counterweight point is set to be the blade root position counterweight point, the liquid counterweight device is set to the blade root position counterweight point, counterweight liquid is added into the liquid counterweight device, and the center of gravity position of the wind driven generator blade to be hoisted is adjusted to the blade center of gravity position required by the single-blade lifting appliance. And then, hoisting the wind driven generator blade to be hoisted, the gravity center position of which is adjusted, by using a single-blade hoisting tool, installing the wind driven generator blade, the gravity center position of which is adjusted, on an impeller of the wind driven generator, and then discharging the counterweight liquid in the liquid counterweight device to restore the original weight and gravity center position of the wind driven generator blade.
The liquid counterweight device can adopt a built-in counterweight device, and the built-in counterweight device comprises: the hollow cavity is arranged inside the wind driven generator blade shell and provided with an opening which serves as a water injection hole and a water drainage hole, and a sealing element is arranged on the opening and used for sealing the opening to enable the hollow opening to be a complete sealing body. The hollow cavity can be made of glass fiber reinforced plastic materials.
The liquid counterweight device can also adopt an external counterweight device, and the external counterweight device comprises: the elastic container is arranged outside the wind driven generator blade shell and provided with an inner cavity, the elastic container is provided with an opening which is used as a water injection and gas injection hole and a water discharge and exhaust hole, and a sealing part is arranged on the opening and used for sealing the opening so that the elastic container becomes a complete sealing body. The elastic container can be made of rubber materials.
First embodiment
Taking the example that the gravity center position of the wind driven generator blade to be hoisted is closer to the blade root than the gravity center position required by the single-blade sling, the gravity center position of the wind driven generator blade to be hoisted is adjusted, as shown in fig. 2 and 3, the adjusting method comprises the following steps:
step 1, designing and selecting a tip position configuration point of a blade 101;
step 2, before the shell of the blade 101 is solidified, a drain hole 106 is prefabricated on the shell of the blade;
step 3, preparing a hollow cavity 102 following the inner surface of the shell of the blade, fixing the hollow cavity 102 on the inner surface of the shell of the blade 101 before closing the die of the blade, and sealing the hollow cavity 102 and a joint;
step 4, communicating the hollow cavity 102 with the pipeline 103, sealing the communication position, fixing the pipeline 103 in the shell of the blade 101, and connecting the pipeline 103 with the water drainage hole 106;
step 5, after the blade 101 is manufactured, weighing the blade 101, and calculating the blade tip counterweight weight required by the gravity center position reaching the requirement of the single-blade lifting appliance;
step 6, injecting the weight of water with required weight into the hollow cavity 102 through the pipeline 106;
step 7, tightly plugging the pipeline opening at the drain hole 106 by using a plug 105 to prevent water from flowing out, wherein a longer rope 104 is arranged at the tail end of the plug 105;
step 8, hoisting the blades 101 into the unit impeller by using a single-blade hoisting tool, and finishing installation according to the installation specification;
step 9, after the blade 101 is installed, rotating the impeller to the position where the blade tip of the blade 101 faces downwards, pulling the plug 105 by using the rope 104, enabling the plug 105 to fall off, and enabling water to be discharged out of the hollow cavity 102 from the water discharging hole, so that the weight and the gravity center position of the blade 101 are restored to the original design state.
Second embodiment
Taking the example that the gravity center position of the wind driven generator blade to be hoisted is closer to the blade root than the gravity center position required by the single-blade hoist, the gravity center position of the wind driven generator blade to be hoisted is adjusted, as shown in fig. 4 and 5, the adjusting method comprises the following steps:
step 1, designing and selecting a tip position configuration point of the blade 201, weighing the blade 201, and calculating the weight needing to be weighed;
step 2, preparing an annular rubber ring 202 with an inner cavity, which is similar to the key appearance of the blade tip position;
step 3, sleeving the rubber ring 202 at a balance weight point at the blade tip position, injecting water into an inner cavity of the rubber ring 202 through an opening on the rubber ring 202 to enable the weight of the water and the weight of the rubber ring to reach the required balance weight, inflating the rubber ring 202 to enable the rubber ring 202 to expand and extrude the surface of the blade 201, enabling friction force to support the rubber ring 202 not to generate relative displacement with the blade 201, arranging a plug 203 on the opening of the rubber ring 202, fixing a long and firm rope 204 at the tail of the plug 203, sealing the rubber ring 202 by the plug 203, and tying a long rope 205 on the rubber ring 202;
step 4, hoisting the blades 201 into the unit impeller by using a single-blade hoisting tool, and finishing installation according to the installation specification;
and 5, pulling the rope 204 on the plug 203, removing the seal of the plug 203 on the rubber ring 202, enabling the plug 203 to fall off, discharging the gas and the liquid in the rubber ring 202, enabling the rubber ring 202 to be in a loose state, and recovering the rubber ring 202 by using the rope 205, so that the weight and the gravity center position of the blade 201 are restored to the original design state.
Third embodiment
Taking the example that the gravity center position of the wind driven generator blade to be hoisted is close to the blade tip compared with the gravity center position required by a single-blade sling, the gravity center position of the wind driven generator blade to be hoisted is adjusted, and the adjusting method comprises the following steps:
step 1, selecting a blade root position counterweight point at a blade root baffle, weighing the blade, and calculating the weight needing counterweight;
and 2, arranging a buckle or a fixing point on the side, close to the blade root, of the combination of the blade root baffle and the blade shell.
Step 3, fixing the rubber flexible container at the buckle or the fixing point, injecting water into the inner cavity of the rubber container to enable the weight of the water and the weight of the rubber container to reach the required weight of the balance weight,
step 4, hoisting the blades into the unit impeller by using a single-blade lifting tool, and finishing installation according to the installation specification
And 5, discharging the neutralizing liquid of the rubber ring, and recovering the rubber ring to restore the weight and the gravity center position of the blade to the design state.
Under the conditions of small blade design change and low engineering application operation difficulty, the universality of the single-blade lifting appliance is greatly improved, the convenience of field construction is considered, and a solution for engineering application is provided for improving the use efficiency of the single-blade lifting appliance, accelerating the development progress of a unit and reducing the lifting and amortization cost of the blades.
While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be determined from the following claims.

Claims (9)

1. A method for adjusting the position of the center of gravity of a wind turbine blade, comprising the steps of: determining a distribution point on a wind driven generator blade to be hoisted, arranging a liquid counterweight device on the distribution point, adjusting the gravity center position of the wind driven generator blade to be hoisted to the blade gravity center position required by a single-blade hoisting tool by adjusting the mass of counterweight liquid in the liquid counterweight device, and discharging the counterweight liquid in the liquid counterweight device after the wind driven generator blade with the gravity center position adjusted is installed on the wind driven generator impeller so as to restore the original weight and gravity center position of the wind driven generator blade.
2. The method according to claim 1, wherein the balancing points comprise a root balancing point and a tip balancing point, the root balancing point is a balancing point within a range from a blade root to a blade center of gravity required by a single blade hanger, and the tip balancing point is a balancing point within a range from a blade center of gravity required by a single blade hanger to a blade tip.
3. The method for adjusting the center of gravity of a wind turbine blade according to claim 2, wherein if the center of gravity of the wind turbine blade to be hoisted is closer to the blade root than the center of gravity required by a single-blade hoist, the counterweight point is set as a blade tip position counterweight point, and the liquid counterweight device is set at the blade tip position counterweight point.
4. The method for adjusting the center of gravity of a wind turbine blade according to claim 2, wherein if the center of gravity of the wind turbine blade to be hoisted is closer to the blade tip than the center of gravity required by a single-blade hoist, the counterweight point is set as a blade root position counterweight point, and the liquid counterweight device is set at the blade root position counterweight point.
5. A liquid counterweight device for adjusting the position of the center of gravity of a wind turbine blade according to any one of claims 1 to 4, wherein the liquid counterweight device is an internal counterweight device disposed inside the wind turbine blade or an external counterweight device disposed outside the wind turbine blade.
6. A fluid weighting device according to claim 5 wherein said internal weighting device comprises: the hollow cavity is arranged inside the wind driven generator blade shell and provided with an opening, and a sealing piece is arranged on the opening.
7. The fluid weight device of claim 6, wherein the hollow chamber is made of glass fiber reinforced plastic.
8. A fluid weighting device according to claim 5 wherein said external weighting device comprises: the elastic container is arranged outside the wind driven generator blade shell and provided with an inner cavity, the elastic container is provided with an opening, and a sealing piece is arranged on the opening.
9. A fluid weight device as defined in claim 8, wherein the resilient container is made of a rubber-like material.
CN201910667297.XA 2019-07-23 2019-07-23 Method and device for adjusting gravity center position of wind driven generator blade Active CN110342388B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201910667297.XA CN110342388B (en) 2019-07-23 2019-07-23 Method and device for adjusting gravity center position of wind driven generator blade

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201910667297.XA CN110342388B (en) 2019-07-23 2019-07-23 Method and device for adjusting gravity center position of wind driven generator blade

Publications (2)

Publication Number Publication Date
CN110342388A CN110342388A (en) 2019-10-18
CN110342388B true CN110342388B (en) 2020-11-10

Family

ID=68179933

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201910667297.XA Active CN110342388B (en) 2019-07-23 2019-07-23 Method and device for adjusting gravity center position of wind driven generator blade

Country Status (1)

Country Link
CN (1) CN110342388B (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN203404024U (en) * 2013-07-19 2014-01-22 上海艾郎风电科技发展有限公司 Wind turbine blade
CN204402770U (en) * 2015-01-21 2015-06-17 北京金风科创风电设备有限公司 The airfoil fan of wind-driven generator
CN106121907A (en) * 2016-06-28 2016-11-16 三重型能源装备有限公司 Blade balancing method, blade and wind-driven generator
CN209067410U (en) * 2018-08-16 2019-07-05 山东华业电气有限公司 Fan blade liquid counterweight

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN203404024U (en) * 2013-07-19 2014-01-22 上海艾郎风电科技发展有限公司 Wind turbine blade
CN204402770U (en) * 2015-01-21 2015-06-17 北京金风科创风电设备有限公司 The airfoil fan of wind-driven generator
CN106121907A (en) * 2016-06-28 2016-11-16 三重型能源装备有限公司 Blade balancing method, blade and wind-driven generator
CN209067410U (en) * 2018-08-16 2019-07-05 山东华业电气有限公司 Fan blade liquid counterweight

Also Published As

Publication number Publication date
CN110342388A (en) 2019-10-18

Similar Documents

Publication Publication Date Title
AU2012264751B2 (en) Wind turbine rotor blade and method for installing a wind turbine rotor blade
JP4405393B2 (en) Method for canceling undesired fluctuations in static pressure conditions occurring in a hollow rotor blade or hydrofoil and rotor blade or hydrofoil
CN110342388B (en) Method and device for adjusting gravity center position of wind driven generator blade
AU2002366862B2 (en) Flow pipe comprising a water turbine having a variable cross-section
CN105544550A (en) Anti-gravity pressurizing grouting method using air bag plugging device
CN105332363B (en) A kind of adjustable pressure core pocket type Air-Cushioned Surge Chamber
CN107795324A (en) A kind of band mould negative pressure mud jacking system and mud jacking method for tunnel double-lining
CN204781026U (en) Mashed root treatment facility of concrete retaining wall
CN206988616U (en) Anchor ear for pipe jacking construction
CN106120689A (en) A kind of detachable ice resistant device being applicable to marine large diameter pile
CN114263123A (en) Bridge pier column concrete curing device and curing method
CN204435200U (en) High ferro prefabricated case beam end-blocking rubber sleeve
CN101586583A (en) Pumping device without power
CN205799356U (en) A kind of sealing ring erecting device
CN210341679U (en) Novel prevent blockking up easy dismouting, can synchronous off-load temporary support sand box device
CN102758778B (en) Core-pulling type submersible pump and mounting method thereof
CN109577323B (en) Tubular pile reinforcing method
CN202545384U (en) Siphon outlet device
CN208214867U (en) A kind of auxiliary component clamp device of machine tooling
CN1974957B (en) Air bag antisilting-up structure
CN205766737U (en) A kind of segment die cover plate locking device
CN204851569U (en) Small -bore wind -force atmospheric pressure power picotan of deep well
CN105971003B (en) A repeated use of preformed hole air bag mould
CN217105189U (en) Water stopping device suitable for between hanging box and steel casing in water
CN213085196U (en) Portable concrete pipeline lifting device capable of being quickly assembled and disassembled

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
CB02 Change of applicant information
CB02 Change of applicant information

Address after: 200241 Dongchuan Road, Shanghai, No. 555, building No. 8, floor, floor, No.

Applicant after: Shanghai Electric Wind Power Group Co.,Ltd.

Address before: 200241, 4 floor, building 555, 4 Dongchuan Road, Shanghai, Minhang District

Applicant before: SHANGHAI ELECTRIC WIND POWER GROUP Co.,Ltd.

GR01 Patent grant
GR01 Patent grant