CN112057932A - Water source filter equipment for farming - Google Patents
Water source filter equipment for farming Download PDFInfo
- Publication number
- CN112057932A CN112057932A CN202010971869.6A CN202010971869A CN112057932A CN 112057932 A CN112057932 A CN 112057932A CN 202010971869 A CN202010971869 A CN 202010971869A CN 112057932 A CN112057932 A CN 112057932A
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- China
- Prior art keywords
- water source
- screening
- buffer
- fixedly connected
- agricultural planting
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- 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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D33/00—Filters with filtering elements which move during the filtering operation
- B01D33/01—Filters with filtering elements which move during the filtering operation with translationally moving filtering elements, e.g. pistons
- B01D33/015—Filters with filtering elements which move during the filtering operation with translationally moving filtering elements, e.g. pistons with flat filtering elements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D33/00—Filters with filtering elements which move during the filtering operation
- B01D33/35—Filters with filtering elements which move during the filtering operation with multiple filtering elements characterised by their mutual disposition
- B01D33/41—Filters with filtering elements which move during the filtering operation with multiple filtering elements characterised by their mutual disposition in series connection
- B01D33/42—Filters with filtering elements which move during the filtering operation with multiple filtering elements characterised by their mutual disposition in series connection concentrically or coaxially
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D33/00—Filters with filtering elements which move during the filtering operation
- B01D33/70—Filters with filtering elements which move during the filtering operation having feed or discharge devices
- B01D33/76—Filters with filtering elements which move during the filtering operation having feed or discharge devices for discharging the filter cake, e.g. chutes
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Filtration Of Liquid (AREA)
Abstract
The invention discloses a water source filtering device for agricultural planting, belongs to the technical field of agricultural planting, and solves the problems that the existing device cannot timely clean deposited silt, so that the silt is accumulated, and the filtration of irrigation water is influenced; the technical characteristics are as follows: the screening device comprises a box body and a buffer cavity, wherein the bottoms of the box body and the buffer cavity are respectively fixed on a base, a filter cavity is arranged in the box body, a screening mechanism is arranged in the filter cavity, the screening mechanism comprises a lower screening assembly and an upper screen frame, an upper screening assembly is arranged in the upper screen frame, and a driving mechanism for adjusting the position of the screening mechanism is arranged in the filter cavity; the embodiment of the invention is provided with the buffer assembly, the lower screening assembly can be protected in a buffer manner, the service life of the lower screening assembly is prolonged, the damage of the lower screening assembly is avoided, the limit of the second sliding block is realized by the arrangement of the positioning seat, the falling off of the second sliding block is avoided, and the driving mechanism has the advantages of high transmission efficiency, energy saving and environmental protection, and is beneficial to popularization and use.
Description
Technical Field
The invention relates to the technical field of agricultural planting, in particular to a water source filtering device for agricultural planting.
Background
In the agricultural planting process, irrigation on crops is very necessary, irrigation in the prior planting industry is achieved through manual irrigation, or a simple irrigation system is used for irrigating planted and cultivated products at one time, water resources are hardly fully utilized, and the resources are wasted.
Chinese patent CN104705162A discloses a water-saving irrigation system with water source filter equipment, plant the pond by a plurality of, silt filter-tank, filter screen, the suction pump, water source purifier, electric cabinet and irrigation nest of tubes are constituteed, still be equipped with ponding groove and ponding output tube on planting the pond wantonly, still be equipped with filter screen on the silt filter-tank, still be equipped with ponding extraction tube and ponding conveyer pipe on the suction pump, still be equipped with the output tube of available water on the water source purifier, still be equipped with a plurality of irrigation pipe that drips on the irrigation nest of tubes, but the device can not carry out timely clearance to sedimentary silt, lead to piling up of silt, influence the filtration of irrigation water, therefore, we propose a water source filter equipment for farming.
Disclosure of Invention
The invention aims to provide a water source filtering device for agricultural planting, which comprises a box body and a buffer cavity, wherein the bottoms of the box body and the buffer cavity are respectively fixed on a base, a filtering cavity is arranged in the box body, a screening mechanism is arranged in the filtering cavity, the screening mechanism comprises a lower screening assembly and an upper screen frame, an upper screening assembly is arranged in the upper screen frame, a driving mechanism for adjusting the position of the screening mechanism is arranged in the filtering cavity, and a water storage cavity is fixedly arranged at the bottom of the filtering cavity, so that the problems that deposited silt cannot be timely cleaned by the conventional device, the silt is accumulated, and the filtering of irrigation water is influenced are solved.
In order to achieve the purpose, the invention provides the following technical scheme:
the utility model provides a water source filter equipment for farming, includes box and cushion chamber, and the bottom of box and cushion chamber is fixed respectively on the base, is equipped with the filter chamber in the box, is equipped with screening mechanism in the filter chamber, and screening mechanism is equipped with the screening subassembly including screening subassembly and last reel down in the screening mechanism, goes up to be equipped with in the reel, is equipped with the actuating mechanism who is used for adjusting screening mechanism position in the filter chamber, and the bottom fixed mounting of filter chamber has the retaining chamber.
As a further scheme of the invention: actuating mechanism includes servo motor and pivot, and servo motor fixed mounting is at the top of box, and servo motor's output end fixedly connected with pivot, and the lateral wall of pivot and box rotates to be connected, and the top fixed mounting of pivot has the gear, and the vertical equipartition in bottom of pivot has a plurality of cams, through bolt fixed connection between cam and the pivot.
As a still further scheme of the invention: the upper screening component comprises a horizontal rack and an upper screen, the upper screen is fixedly connected with the horizontal rack through a bolt, one end of the horizontal rack penetrates through the side wall of the upper screen frame, a second sliding block is fixedly connected with the horizontal rack, the gear and the horizontal rack are in meshing transmission, and the upper screen is in sliding connection with the upper screen frame.
As a still further scheme of the invention: the left side wall of box body fixed mounting has the positioning seat, and the second slider cover is established on the positioning seat, and sliding connection between positioning seat and the second slider.
As a still further scheme of the invention: the lower screening subassembly includes screen cloth and push pedal down, the one end of screen cloth is articulated with the lateral wall of box down, the other end fixedly connected with push pedal of screen cloth down, the lateral wall of push pedal articulates there is articulated piece, articulated piece is installed in vertical spout, and articulated piece and vertical spout sliding connection, vertical spout sets up in one side of cam, bolt fixedly connected with movable plate is passed through to one side of vertical spout, the one end that vertical spout was kept away from to the movable plate extends to the cushion chamber in, be equipped with a plurality of buffer unit who is used for protecting the movable plate in the cushion chamber.
As a still further scheme of the invention: the buffer assembly comprises a buffer seat and buffer springs, the buffer seat is fixedly connected with the side wall of the buffer cavity through bolts, the buffer springs are fixedly installed in the buffer seat, the first slider of one end of each buffer spring is fixedly connected with the first slider, two horizontal sliding grooves used for limiting the first slider are symmetrically arranged in the buffer seat, cushion pads are installed in the horizontal sliding grooves, the cushion pads are fixedly connected with the first sliders, and the cushion pads are connected with the horizontal sliding grooves in a sliding mode.
In conclusion, the beneficial effects of the invention are as follows: the embodiment of the invention is provided with the buffer assembly, the lower screening assembly can be protected in a buffer manner, the service life of the lower screening assembly is prolonged, the damage of the lower screening assembly is avoided, the limit of the second sliding block is realized by the arrangement of the positioning seat, the falling off of the second sliding block is avoided, and the driving mechanism has the advantages of high transmission efficiency, energy saving and environmental protection, and is beneficial to popularization and use.
Drawings
Fig. 1 is a schematic structural diagram of the invention.
Fig. 2 is a schematic structural diagram of an upper screen frame in the invention.
Fig. 3 is a schematic structural diagram of a second slider in the invention.
Fig. 4 is a partially enlarged schematic view of a in fig. 1.
Fig. 5 is a partially enlarged schematic view of B in fig. 1.
FIG. 6 is a schematic view of a cushion assembly according to the present invention.
FIG. 7 is a schematic view of the structure of the cushion seat of the present invention.
Fig. 8 is a schematic structural view of a lower screen in the present invention.
In the figure: 1-box body, 2-buffer cavity, 3-filter cavity, 4-base, 5-water storage cavity, 6-lower screening component, 7-lower screen mesh, 8-upper screen frame, 9-horizontal rack, 10-servo motor, 11-rotating shaft, 12-upper screen mesh, 13-buffer pad, 14-first slide block, 15-gear, 16-positioning seat, 17-second slide block, 18-push plate, 19-hinged block, 20-vertical chute, 21-moving plate, 22-buffer component, 23-buffer seat, 24-buffer spring, 25-horizontal chute and 26-cam.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
As shown in fig. 1, in the embodiment of the present invention, a water source filtering device for agricultural planting includes a box body 1 and a buffer chamber 2, bottoms of the box body 1 and the buffer chamber 2 are respectively fixed on a base 4, a filtering chamber 3 is disposed in the box body 1, a screening mechanism is disposed in the filtering chamber 3, the screening mechanism includes a lower screening assembly 6 and an upper screen frame 8, an upper screening assembly is disposed in the upper screen frame 8, and a driving mechanism for adjusting a position of the screening mechanism is disposed in the filtering chamber 3;
as shown in fig. 4, the driving mechanism includes a servo motor 10 and a rotating shaft 11, the servo motor 10 is fixedly installed at the top of the box body 1, the output end of the servo motor 10 is fixedly connected with the rotating shaft 11, the rotating shaft 11 is rotatably connected with the side wall of the box body 1, a gear 15 is fixedly installed at the top of the rotating shaft 11, a plurality of cams 26 are longitudinally and uniformly distributed at the bottom of the rotating shaft 11, and the cams 26 are fixedly connected with the rotating shaft 11 through bolts;
as shown in fig. 2, the upper screening assembly comprises a horizontal rack 9 and an upper screen 12, the upper screen 12 is fixedly connected with the horizontal rack 9 through a bolt, the upper screen 12 is slidably connected with the upper screen frame 8, one end of the horizontal rack 9 penetrates through the side wall of the upper screen frame 8 and is fixedly connected with a second sliding block 17, and the gear 15 is in meshing transmission with the horizontal rack 9;
the servo motor 10 is started to drive the rotating shaft 11 to rotate, the rotating shaft 11 drives the gear 15 to rotate, and the gear 15 drives the horizontal rack 9 to move horizontally, so that the horizontal rack 9 drives the upper screen 12 to move horizontally, the water body on the upper screen 12 is filtered, the accumulation of impurities in the upper screen frame 8 is avoided, and the impurities are conveniently discharged;
as shown in fig. 3, a positioning seat 16 is fixedly installed on the left side wall of the box body 1, the second slider 17 is sleeved on the positioning seat 16, the positioning seat 16 is in sliding connection with the second slider 17, and the positioning seat 16 is arranged to limit the second slider 17 and prevent the second slider 17 from falling off;
as shown in fig. 5 and 8, the lower screening component 6 includes a lower screen 7 and a push plate 18, one end of the lower screen 7 is hinged to the side wall of the box 1, the other end of the lower screen 7 is fixedly connected with the push plate 18, the side wall of the push plate 18 is hinged to a hinge block 19, the hinge block 19 is installed in a vertical chute 20, the hinge block 19 is slidably connected with the vertical chute 20, the vertical chute 20 is arranged on one side of a cam 26, one side of the vertical chute 20 is fixedly connected with a moving plate 21 through a bolt, one end of the moving plate 21, which is far away from the vertical chute 20, extends into the buffer cavity 2, and a plurality of buffer components 22 for protecting the moving plate 21 are arranged in the buffer;
the pivot 11 rotates and can drive cam 26 and rotate, and cam 26 drives vertical chute 20 and movable plate 21 and removes, and then makes vertical chute 20 drive articulated piece 19 and push pedal 18 and remove to realized that drive down screen cloth 7 rotates, do benefit to the filtration to the water, improved the filter effect, and avoided piling up of impurity on the lower screen cloth 7.
Example 2
As shown in fig. 1, in the embodiment of the present invention, a water source filtering device for agricultural planting includes a box body 1 and a buffer chamber 2, bottoms of the box body 1 and the buffer chamber 2 are respectively fixed on a base 4, a filtering chamber 3 is disposed in the box body 1, a screening mechanism is disposed in the filtering chamber 3, the screening mechanism includes a lower screening assembly 6 and an upper screen frame 8, an upper screening assembly is disposed in the upper screen frame 8, and a driving mechanism for adjusting a position of the screening mechanism is disposed in the filtering chamber 3;
as shown in fig. 4, the driving mechanism includes a servo motor 10 and a rotating shaft 11, the servo motor 10 is fixedly installed at the top of the box body 1, the output end of the servo motor 10 is fixedly connected with the rotating shaft 11, the rotating shaft 11 is rotatably connected with the side wall of the box body 1, a gear 15 is fixedly installed at the top of the rotating shaft 11, a plurality of cams 26 are longitudinally and uniformly distributed at the bottom of the rotating shaft 11, and the cams 26 are fixedly connected with the rotating shaft 11 through bolts;
as shown in fig. 2, the upper screening assembly comprises a horizontal rack 9 and an upper screen 12, the upper screen 12 is fixedly connected with the horizontal rack 9 through a bolt, the upper screen 12 is slidably connected with the upper screen frame 8, one end of the horizontal rack 9 penetrates through the side wall of the upper screen frame 8 and is fixedly connected with a second sliding block 17, and the gear 15 is in meshing transmission with the horizontal rack 9;
the servo motor 10 is started to drive the rotating shaft 11 to rotate, the rotating shaft 11 drives the gear 15 to rotate, and the gear 15 drives the horizontal rack 9 to move horizontally, so that the horizontal rack 9 drives the upper screen 12 to move horizontally, the water body on the upper screen 12 is filtered, the accumulation of impurities in the upper screen frame 8 is avoided, and the impurities are conveniently discharged;
as shown in fig. 3, a positioning seat 16 is fixedly installed on the left side wall of the box body 1, the second slider 17 is sleeved on the positioning seat 16, the positioning seat 16 is in sliding connection with the second slider 17, and the positioning seat 16 is arranged to limit the second slider 17 and prevent the second slider 17 from falling off;
as shown in fig. 5 and 8, the lower screening component 6 includes a lower screen 7 and a push plate 18, one end of the lower screen 7 is hinged to the side wall of the box 1, the other end of the lower screen 7 is fixedly connected with the push plate 18, the side wall of the push plate 18 is hinged to a hinge block 19, the hinge block 19 is installed in a vertical chute 20, the hinge block 19 is slidably connected with the vertical chute 20, the vertical chute 20 is arranged on one side of a cam 26, one side of the vertical chute 20 is fixedly connected with a moving plate 21 through a bolt, one end of the moving plate 21, which is far away from the vertical chute 20, extends into the buffer cavity 2, and a plurality of buffer components 22 for protecting the moving plate 21 are arranged in the buffer;
the pivot 11 rotates and can drive cam 26 and rotate, and cam 26 drives vertical chute 20 and movable plate 21 and removes, and then makes vertical chute 20 drive articulated piece 19 and push pedal 18 and remove to realized that drive down screen cloth 7 rotates, do benefit to the filtration to the water, improved the filter effect, and avoided piling up of impurity on the lower screen cloth 7.
As shown in fig. 6 and 7, the buffer assembly 22 includes a buffer seat 23 and a buffer spring 24, the buffer seat 23 is fixedly connected with the side wall of the buffer cavity 2 through a bolt, the buffer spring 24 is fixedly installed in the buffer seat 23, and one end of the buffer spring 24 is fixedly connected with the first slider 14;
two horizontal sliding grooves 25 used for limiting the first sliding block 14 are symmetrically arranged in the buffer seat 23, a buffer pad 13 is installed in the horizontal sliding grooves 25, the buffer pad 13 is in sliding connection with the horizontal sliding grooves 25, and the buffer pad 13 is fixedly connected with the first sliding block 14.
The bottom of the filter cavity 3 is fixedly provided with a water storage cavity 5.
In summary, the working principle of the invention is as follows: the servo motor 10 is started to drive the rotating shaft 11 to rotate, the rotating shaft 11 drives the gear 15 to rotate, and the gear 15 drives the horizontal rack 9 to move horizontally, so that the horizontal rack 9 drives the upper screen 12 to move horizontally, the water body on the upper screen 12 is filtered, the accumulation of impurities in the upper screen frame 8 is avoided, and the impurities are conveniently discharged;
the pivot 11 rotates and can drive cam 26 and rotate, and cam 26 drives vertical chute 20 and movable plate 21 and removes, and then makes vertical chute 20 drive articulated piece 19 and push pedal 18 and remove to realized that drive down screen cloth 7 rotates, do benefit to the filtration to the water, improved the filter effect, and avoided piling up of impurity on the lower screen cloth 7.
The embodiment of the invention is provided with the buffer assembly 22, so that the lower screening assembly 6 can be protected in a buffer manner, the service life of the lower screening assembly 6 is prolonged, the lower screening assembly 6 is prevented from being damaged, the second sliding block 17 is limited by the positioning seat 16, the second sliding block 17 is prevented from falling off, and the driving mechanism has the advantages of high transmission efficiency, energy conservation and environmental protection, and is beneficial to popularization and use.
Although several embodiments and examples of the present invention have been described for those skilled in the art, these embodiments and examples are presented as examples and are not intended to limit the scope of the invention. These new embodiments can be implemented in other various ways, and various omissions, substitutions, and changes can be made without departing from the spirit of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalent scope thereof.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (10)
1. The utility model provides a water source filter equipment for farming, includes box (1) and cushion chamber (2), the bottom of box (1) and cushion chamber (2) is fixed respectively on base (4), its characterized in that is equipped with filter chamber (3) in box (1), is equipped with screening mechanism in filter chamber (3), and screening mechanism is equipped with the screening subassembly including screening subassembly (6) and last reel (8) down, goes up to be equipped with in reel (8) and screens the subassembly, is equipped with the actuating mechanism who is used for adjusting screening mechanism position in filter chamber (3).
2. The water source filtering device for agricultural planting according to claim 1, wherein the driving mechanism comprises a servo motor (10) and a rotating shaft (11), the servo motor (10) is fixedly installed at the top of the box body (1), the rotating shaft (11) is fixedly connected to the output end of the servo motor (10), the rotating shaft (11) is rotatably connected with the side wall of the box body (1), a gear (15) is fixedly installed at the top of the rotating shaft (11), a plurality of cams (26) are longitudinally and uniformly distributed at the bottom of the rotating shaft (11), and the cams (26) are fixedly connected with the rotating shaft (11) through bolts.
3. The water source filtering device for agricultural planting according to claim 2, wherein the upper screening component comprises a horizontal rack (9) and an upper screen (12), the upper screen (12) is fixedly connected with the horizontal rack (9) through a bolt, one end of the horizontal rack (9) penetrates through the side wall of the upper screen frame (8), a second sliding block (17) is fixedly connected with the horizontal rack, and the gear (15) and the horizontal rack (9) are in meshing transmission.
4. The water source filtering device for agricultural planting according to claim 3, characterized in that the upper screen (12) and the upper screen frame (8) are connected in a sliding manner.
5. The water source filtering device for agricultural planting according to claim 3, wherein the positioning seat (16) is fixedly installed on the left side wall of the box body (1), the second sliding block (17) is sleeved on the positioning seat (16), and the positioning seat (16) and the second sliding block (17) are connected in a sliding manner.
6. The water source filtering device for agricultural planting according to any one of claims 2 to 5, wherein the lower screening assembly (6) comprises a lower screen (7) and a push plate (18), one end of the lower screen (7) is hinged with the side wall of the box body (1), the other end of the lower screen (7) is fixedly connected with the push plate (18), the side wall of the push plate (18) is hinged with a hinge block (19), the hinge block (19) is installed in a vertical chute (20), and articulated piece (19) and vertical spout (20) sliding connection, vertical spout (20) set up in one side of cam (26), and bolt fixedly connected with movable plate (21) is passed through to one side of vertical spout (20), and in movable plate (21) kept away from the one end of vertical spout (20) extended to cushion chamber (2), be equipped with a plurality of buffer unit (22) that are used for protecting movable plate (21) in cushion chamber (2).
7. The water source filtering device for agricultural planting according to claim 6, wherein the buffering component (22) comprises a buffering seat (23) and a buffering spring (24), the buffering seat (23) is fixedly connected with the side wall of the buffering cavity (2) through a bolt, the buffering spring (24) is fixedly installed in the buffering seat (23), and one end of the buffering spring (24) is fixedly connected with the first sliding block (14).
8. The water source filtering device for agricultural planting according to claim 7, wherein two horizontal sliding grooves (25) for limiting the first sliding block (14) are symmetrically arranged in the buffer seat (23), the buffer cushion (13) is arranged in the horizontal sliding grooves (25), and the buffer cushion (13) is fixedly connected with the first sliding block (14).
9. The filtration unit for a water source for agricultural cultivation according to claim 8, wherein the cushion (13) is slidably connected to the horizontal chute (25).
10. The water source filtering device for agricultural planting according to any one of claims 2 to 5, wherein the bottom of the filtering cavity (3) is fixedly provided with the water storage cavity (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010971869.6A CN112057932A (en) | 2020-09-16 | 2020-09-16 | Water source filter equipment for farming |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010971869.6A CN112057932A (en) | 2020-09-16 | 2020-09-16 | Water source filter equipment for farming |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112057932A true CN112057932A (en) | 2020-12-11 |
Family
ID=73696839
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010971869.6A Withdrawn CN112057932A (en) | 2020-09-16 | 2020-09-16 | Water source filter equipment for farming |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112057932A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112934687A (en) * | 2021-01-30 | 2021-06-11 | 安徽建筑大学 | Oscillating grit sieving mechanism for civil engineering |
-
2020
- 2020-09-16 CN CN202010971869.6A patent/CN112057932A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112934687A (en) * | 2021-01-30 | 2021-06-11 | 安徽建筑大学 | Oscillating grit sieving mechanism for civil engineering |
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Application publication date: 20201211 |