CN112376510A - Diversion canal leveling equipment for hydraulic engineering construction - Google Patents

Diversion canal leveling equipment for hydraulic engineering construction Download PDF

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Publication number
CN112376510A
CN112376510A CN202011250712.0A CN202011250712A CN112376510A CN 112376510 A CN112376510 A CN 112376510A CN 202011250712 A CN202011250712 A CN 202011250712A CN 112376510 A CN112376510 A CN 112376510A
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CN
China
Prior art keywords
wall
plate
rod
aqueduct
water conservancy
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.)
Withdrawn
Application number
CN202011250712.0A
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Chinese (zh)
Inventor
刘启容
余友明
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Individual
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Individual
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Publication date
Application filed by Individual filed Critical Individual
Priority to CN202011250712.0A priority Critical patent/CN112376510A/en
Publication of CN112376510A publication Critical patent/CN112376510A/en
Withdrawn legal-status Critical Current

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    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02B—HYDRAULIC ENGINEERING
    • E02B5/00—Artificial water canals, e.g. irrigation canals
    • E02B5/02—Making or lining canals
    • 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
    • F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
    • 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
    • F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
    • F16F15/04—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means
    • F16F15/06—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means with metal springs
    • F16F15/067—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means with metal springs using only wound springs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S30/00—Arrangements for moving or orienting solar heat collector modules
    • F24S30/40—Arrangements for moving or orienting solar heat collector modules for rotary movement
    • F24S30/42—Arrangements for moving or orienting solar heat collector modules for rotary movement with only one rotation axis
    • F24S30/425—Horizontal axis
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
    • H02S20/00—Supporting structures for PV modules
    • H02S20/30—Supporting structures being movable or adjustable, e.g. for angle adjustment
    • 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
    • Y02E10/40—Solar thermal energy, e.g. solar towers
    • Y02E10/47—Mountings or tracking
    • 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
    • Y02E10/50—Photovoltaic [PV] energy

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Road Paving Machines (AREA)

Abstract

The invention belongs to the technical field of hydraulic engineering, and particularly relates to a diversion canal leveling device for hydraulic engineering construction. According to the invention, the support column, the adjusting cylinder, the adjusting rod and the fastening knob are arranged, so that a user can adjust the length of the adjusting rod according to the height of the user, the fastening knob is fixed, the user can conveniently adjust the length of the adjusting rod, and the user can conveniently hold the handle in a comfortable manner.

Description

Diversion canal leveling equipment for hydraulic engineering construction
Technical Field
The invention relates to the technical field of hydraulic engineering, in particular to a diversion canal leveling device for hydraulic engineering construction.
Background
Hydraulic engineering is an engineering built for controlling and allocating surface water and underground water in nature to achieve the purposes of removing harmful substances and benefiting. Also known as water engineering. Water is a valuable resource essential for human production and life, but its naturally occurring state does not completely meet the needs of human beings. Only when hydraulic engineering is built, water flow can be controlled, flood disasters are prevented, and water quantity is adjusted and distributed to meet the requirements of people on water resources in life and production.
The prior art discloses the ditch leveling technique that has the water conservancy to be relevant, for example the automatic floating device of ditch that prior art disclosed, which comprises a frame, the top fixedly connected with driving motor of frame, fixedly connected with pivot on driving motor's the output shaft, the bottom of pivot extends to the below of frame, and this technical design is reasonable, controls the convenience, and the drive backup pad of being convenient for moves down, can remove two universal wheels to the below of spatula, and whole device can be through the universal wheel subaerial walking, and can accomodate the universal wheel to the frame in, is convenient for remove the position of whole device, makes things convenient for people to use.
However, the prior art still has the following disadvantages: the device is not provided with a mechanism for adjusting the height of the device, and users with different heights can use the device inconveniently when using the device, so that the device has lower practicability and inconvenient use.
Disclosure of Invention
Based on the technical problems that a mechanism for adjusting the height of the device is not arranged in the device provided by the background technology, users with different heights can have the phenomenon of inconvenient use when using the device, so that the practicability of the device is low and the use is inconvenient, the invention provides the diversion canal leveling equipment for hydraulic engineering construction.
The invention provides a diversion canal leveling device for hydraulic engineering construction, which comprises a bottom plate, wherein the outer wall of the bottom plate is provided with universal wheels, the outer wall of the top of the bottom plate is provided with a support column, the outer wall of the top of the support column is provided with an adjusting cylinder, the outer wall of one side of the adjusting cylinder is provided with a fastening knob, the inner wall of the adjusting cylinder is connected with an adjusting rod in a sliding manner, the outer wall of the top of the adjusting rod is provided with a handle, the outer wall of one side of the support column is provided with a transverse plate, the outer wall of the top of the transverse plate is provided with a solar mechanism, two sides of the outer wall of the bottom of the transverse plate are respectively provided with a first hydraulic rod, the outer wall of the bottom of the first hydraulic rod is provided with a fixing plate, facilitating the user to hold the handle in a comfortable manner.
Preferably, the lateral wall of diaphragm is provided with the dead lever, and the other end of dead lever is provided with the guard plate, when leveling to the ditch, the guard plate can prevent effectively that muddy water from spattering on one's body.
Preferably, solar energy mechanism is including pole setting and second hydraulic stem, and the top outer wall swing joint of pole setting and second hydraulic stem has same solar cell panel, with second hydraulic stem connection hydraulic system, adjusts the angle that the length of second hydraulic stem can adjust solar cell panel, can improve the utilization ratio of solar energy, and solar cell panel can be with solar energy conversion electric energy for the device provides partial electric power.
Preferably, leveling mechanism is including the motor, and the output shaft of motor has the bull stick through the coupling joint, and the welding of the bottom outer wall of bull stick has the connecting plate.
Preferably, the bottom outer wall four corners of connecting plate all is provided with the connecting cylinder, and the inner wall both sides of connecting cylinder all are provided with the spout, and the inside sliding connection of spout has the movable plate.
Preferably, both sides of the top outer wall of the moving plate are provided with buffer springs, the top outer wall of the moving plate is provided with a hinged frame, and the top outer wall of the hinged frame is provided with a damping plate.
Preferably, the outer wall of the bottom of the moving plate is provided with a connecting groove, and the inner wall of the connecting groove is slidably connected with a sliding plate.
Preferably, the outer wall of the bottom of the sliding plate is provided with a spring damper, and the outer wall of the bottom of the spring damper is provided with a spatula.
The beneficial effects of the invention are as follows:
1. this diversion canal leveling equipment for hydraulic engineering construction, through being provided with the support column, adjust a section of thick bamboo, adjust pole and fastening knob, the user can be according to the length of the height regulation pole of oneself, the fixed fastening knob person of facilitating the use carries out length adjustment to the regulation pole, convenient to use holds the handle with comfortable mode, in addition through being provided with dead lever and guard plate, the user is when leveling to the canal, the guard plate can prevent effectively that muddy water from spattering on one's body, has improved the practicality of device.
2. This diversion canal leveling equipment is used in hydraulic engineering construction through being provided with pole setting, second hydraulic stem and solar cell panel, with second hydraulic stem connection hydraulic system, adjusts the angle of the length adjustable solar cell panel of second hydraulic stem, can improve the utilization ratio of solar energy, and solar cell panel can provide partial electric power for the device with solar energy transformation for the electric energy, and solar cell panel's setting can keep off the rain to the motor in addition.
3. This diversion canal leveling equipment is used in hydraulic engineering construction, through being provided with first hydraulic stem, including a motor, an end cap, a controller, and a cover plate, buffer spring, the spout, shock attenuation board and spring damper, connect hydraulic system with first hydraulic stem, adjust the length of first hydraulic stem and can make the spatula carry out the flattening to the ground of co-altitude not, buffer spring, shock attenuation board and spring damper all can carry out the rocking that the during operation reducing mechanism received at the spatula, can improve the flattening effect of spatula, also can rock the life who improves the motor through the reduction.
The parts of the device not involved are the same as or can be implemented using prior art.
Drawings
Fig. 1 is a schematic structural view of a water diversion channel leveling device for hydraulic engineering construction, which is provided by the invention;
fig. 2 is a schematic structural view of a first hydraulic rod of the aqueduct leveling device for hydraulic engineering construction, which is provided by the invention;
fig. 3 is a schematic structural view of a buffer spring of the aqueduct leveling device for hydraulic engineering construction, which is provided by the invention;
fig. 4 is a schematic view of a portion a of fig. 3.
In the figure: the solar cell panel fixing device comprises a base plate 1, universal wheels 2, supporting columns 3, adjusting cylinders 4, fastening knobs 5, adjusting rods 6, handles 7, a solar cell panel 8, a transverse plate 9, a spring shock absorber 10, a spatula 11, a connecting plate 12, a connecting cylinder 13, a first hydraulic rod 14, a vertical rod 15, a second hydraulic rod 16, a fixing plate 17, a motor 18, a movable plate 19, a sliding groove 20, a damping plate 21, a buffer spring 22, a hinged frame 23, a connecting groove 24 and a sliding plate 25.
Detailed Description
The technical solution of the present patent will be described in further detail with reference to the following embodiments.
Reference will now be made in detail to embodiments of the present patent, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present patent and are not to be construed as limiting the present patent.
In the description of this patent, it is to be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for the convenience of describing the patent and for the simplicity of description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the patent.
In the description of this patent, it is noted that unless otherwise specifically stated or limited, the terms "mounted," "connected," and "disposed" are to be construed broadly and can include, for example, fixedly connected, disposed, detachably connected, disposed, or integrally connected and disposed. The specific meaning of the above terms in this patent may be understood by those of ordinary skill in the art as appropriate.
Referring to fig. 1-4, a diversion canal leveling device for hydraulic engineering construction comprises a base plate 1, universal wheels 2 are fixed on the outer wall of the bottom of the base plate 1 through screws, a support column 3 is fixed on the outer wall of the top of the base plate 1 through screws, an adjusting cylinder 4 is fixed on the outer wall of the top of the support column 3 through screws, a fastening knob 5 is arranged on the outer wall of one side of the adjusting cylinder 4, an adjusting rod 6 is connected on the inner wall of the adjusting cylinder 4 in a sliding manner, a handle 7 is fixed on the outer wall of the top of the adjusting rod 6 through screws, a transverse plate 9 is fixed on the outer wall of one side of the support column 3 through screws, a solar mechanism is arranged on the outer wall of the top of the transverse plate 9, first hydraulic rods 14 are fixed on two sides of the outer wall of the bottom of the transverse plate 9 through screws, a fixing plate 17 is fixed on the outer wall of the, the user can adjust the length of pole 6 according to the height of oneself, fixes fastening knob 5 and is convenient for the user to carry out length adjustment to adjusting rod 6, and convenient to use person holds handle 7 with comfortable mode, and the user of the different heights of being convenient for uses.
In the invention, the outer wall of one side of the transverse plate 9 is fixed with the fixed rod through the screw, and the other end of the fixed rod is fixed with the protection plate through the screw, so that when the canal is leveled, the protection plate can effectively prevent muddy water from splashing on the body, and the practicability of the device is improved.
In the invention, the solar mechanism comprises the upright rod 15 and the second hydraulic rod 16, the outer walls of the tops of the upright rod 15 and the second hydraulic rod 16 are movably connected with the same solar cell panel 8, the second hydraulic rod 16 is connected with a hydraulic system, the length of the second hydraulic rod 16 is adjusted, the angle of the solar cell panel 8 is adjusted, the utilization rate of solar energy can be improved, and the solar cell panel 8 can convert solar energy into electric energy to provide partial electric power for the device, thereby saving energy and protecting environment.
In the invention, the leveling mechanism comprises a motor 18, an output shaft of the motor 18 is connected with a rotating rod through a coupler, a connecting plate 12 is welded on the outer wall of the bottom of the rotating rod, the motor 18 is turned on, and the motor 18 drives the rotating rod to rotate, so that the spatula 11 can rotate to quickly level the ditch conveniently.
In the invention, four corners of the outer wall of the bottom of the connecting plate 12 are all fixed with the connecting cylinder 13 through screws, two sides of the inner wall of the connecting cylinder 13 are all fixed with the sliding grooves 20 through screws, the moving plate 19 is connected inside the sliding grooves 20 in a sliding manner, two sides of the outer wall of the top of the moving plate 19 are both provided with the buffer springs 22, the outer wall of the top of the moving plate 19 is provided with the hinged frame 23, the outer wall of the top of the hinged frame 23 is fixed with the shock absorption plate 21 through screws, and when the trowel is greatly shaken, the buffer springs 22 have a buffer effect to reduce the sliding amplitude of the moving plate 19 inside the sliding grooves 20, so that.
In the invention, the outer wall of the bottom of the moving plate 19 is fixed with the connecting groove 24 through a screw, the inner wall of the connecting groove 24 is connected with the sliding plate 25 in a sliding manner, the outer wall of the bottom of the sliding plate 25 is fixed with the spring damper 10 through a screw, the outer wall of the bottom of the spring damper 10 is fixed with the spatula 11 through a screw, the spring damper 10 can effectively reduce the shaking of the device, the damping effect of the device can be effectively improved, the shaking of the motor 18 can be reduced, and the service life of the motor can be prolonged.
The device is connected with a power supply, firstly, a user can adjust the length of the adjusting rod 6 according to the height of the user, the fastening knob 5 is fixed, the user can adjust the length of the adjusting rod 6 conveniently, the user can hold the handle 7 by hand in a comfortable way, the second hydraulic rod 16 is connected with a hydraulic system, the length of the second hydraulic rod 16 can be adjusted, the angle of the solar cell panel 8 can be adjusted, the solar cell panel 8 can convert solar energy into electric energy to provide partial electric power for the device, the first hydraulic rod 14 is connected with a hydraulic system, the length of the first hydraulic rod 14 is adjusted to enable the spatula to level the ground with different heights, the buffer spring 22, the shock absorption plate 21 and the spring shock absorber 10 can reduce the shake received by the device when the spatula works, can improve the flattening effect of spatula, the guard plate can prevent effectively that muddy water from spattering on one's body, has improved the practicality of device.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.

Claims (8)

1. The diversion canal leveling equipment for the hydraulic engineering construction comprises a base plate (1) and is characterized in that universal wheels (2) are arranged on the outer wall of the bottom plate (1) at the bottom, supporting columns (3) are arranged on the outer wall of the top of the base plate (1), adjusting cylinders (4) are arranged on the outer wall of the top of the supporting columns (3), fastening knobs (5) are arranged on the outer wall of one side of each adjusting cylinder (4), adjusting rods (6) are slidably connected to the inner wall of each adjusting cylinder (4), handles (7) are arranged on the outer wall of the top of each adjusting rod (6), transverse plates (9) are arranged on the outer wall of one side of each supporting column (3), solar mechanisms are arranged on the outer wall of the top of each transverse plate (9), first hydraulic rods (14) are arranged on two sides of the outer wall of the bottom of each transverse plate (9), fixing plates (17), the outer wall of the bottom of the fixed plate (17) is provided with a leveling mechanism.
2. The aqueduct leveling device for the water conservancy project construction as claimed in claim 1, wherein a fixing rod is provided on an outer wall of one side of the transverse plate (9), and a protection plate is provided on the other end of the fixing rod.
3. The aqueduct leveling device for the water conservancy project construction as claimed in claim 2, wherein the solar mechanism comprises a vertical rod (15) and a second hydraulic rod (16), and the top outer walls of the vertical rod (15) and the second hydraulic rod (16) are movably connected with the same solar cell panel (8).
4. The aqueduct leveling device for the water conservancy project construction according to claim 1, wherein the leveling mechanism comprises a motor (18), an output shaft of the motor (18) is connected with a rotating rod through a coupler, and a connecting plate (12) is welded on the outer wall of the bottom of the rotating rod.
5. The aqueduct leveling device for the water conservancy project construction according to claim 4, wherein four corners of the outer wall of the bottom of the connecting plate (12) are provided with connecting cylinders (13), two sides of the inner wall of each connecting cylinder (13) are provided with sliding grooves (20), and a moving plate (19) is slidably connected inside each sliding groove (20).
6. The aqueduct leveling device for the water conservancy project construction according to claim 5, wherein buffer springs (22) are arranged on two sides of the outer wall of the top of the movable plate (19), a hinged frame (23) is arranged on the outer wall of the top of the movable plate (19), and a damping plate (21) is arranged on the outer wall of the top of the hinged frame (23).
7. The aqueduct leveling device for the water conservancy project construction according to claim 6, wherein the outer wall of the bottom of the moving plate (19) is provided with a connecting groove (24), and the inner wall of the connecting groove (24) is slidably connected with a sliding plate (25).
8. The aqueduct leveling device for water conservancy project construction according to claim 7, wherein the bottom outer wall of the sliding plate (25) is provided with a spring damper (10), and the bottom outer wall of the spring damper (10) is provided with a spatula (11).
CN202011250712.0A 2020-11-10 2020-11-10 Diversion canal leveling equipment for hydraulic engineering construction Withdrawn CN112376510A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011250712.0A CN112376510A (en) 2020-11-10 2020-11-10 Diversion canal leveling equipment for hydraulic engineering construction

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011250712.0A CN112376510A (en) 2020-11-10 2020-11-10 Diversion canal leveling equipment for hydraulic engineering construction

Publications (1)

Publication Number Publication Date
CN112376510A true CN112376510A (en) 2021-02-19

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202011250712.0A Withdrawn CN112376510A (en) 2020-11-10 2020-11-10 Diversion canal leveling equipment for hydraulic engineering construction

Country Status (1)

Country Link
CN (1) CN112376510A (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0813805A (en) * 1994-06-28 1996-01-16 Asahi Chem Ind Co Ltd Form of ventilation opening in foundation and construction method of ventilation opening in foundation
CN206448536U (en) * 2017-02-16 2017-08-29 王峰 A kind of building machinery
CN108756249A (en) * 2018-07-05 2018-11-06 郑州市建筑设计院 A kind of building concrete spreading out device
CN109667245A (en) * 2018-12-11 2019-04-23 邱国盛 A kind of rural area water channel lower concrete construction equipment
CN111636277A (en) * 2020-06-23 2020-09-08 栾勇 Tamping and leveling device for building concrete laying

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0813805A (en) * 1994-06-28 1996-01-16 Asahi Chem Ind Co Ltd Form of ventilation opening in foundation and construction method of ventilation opening in foundation
CN206448536U (en) * 2017-02-16 2017-08-29 王峰 A kind of building machinery
CN108756249A (en) * 2018-07-05 2018-11-06 郑州市建筑设计院 A kind of building concrete spreading out device
CN109667245A (en) * 2018-12-11 2019-04-23 邱国盛 A kind of rural area water channel lower concrete construction equipment
CN111636277A (en) * 2020-06-23 2020-09-08 栾勇 Tamping and leveling device for building concrete laying

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Application publication date: 20210219

WW01 Invention patent application withdrawn after publication