CN113458668A - Automatic welding wire pressing-in device - Google Patents
Automatic welding wire pressing-in device Download PDFInfo
- Publication number
- CN113458668A CN113458668A CN202110733365.5A CN202110733365A CN113458668A CN 113458668 A CN113458668 A CN 113458668A CN 202110733365 A CN202110733365 A CN 202110733365A CN 113458668 A CN113458668 A CN 113458668A
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- welding wire
- automatic
- box body
- driven
- threaded
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- 238000003466 welding Methods 0.000 title claims abstract description 122
- 238000003825 pressing Methods 0.000 claims abstract description 35
- 238000010008 shearing Methods 0.000 claims abstract description 19
- 229910000679 solder Inorganic materials 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 5
- 230000001360 synchronised effect Effects 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 239000007788 liquid Substances 0.000 description 10
- 239000003507 refrigerant Substances 0.000 description 8
- 238000005520 cutting process Methods 0.000 description 5
- 238000005457 optimization Methods 0.000 description 5
- 238000003860 storage Methods 0.000 description 5
- 238000004378 air conditioning Methods 0.000 description 1
- 238000010009 beating Methods 0.000 description 1
- 230000002146 bilateral effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
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- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Wire Processing (AREA)
Abstract
The invention discloses an automatic welding wire pressing-in device which comprises an equipment main body, wherein a pressure grooved wheel, a welding wire pressing wheel, a welding wire shearing cylinder, a welding wire feeding servo motor, a wire guide rod, a welding wire shearing mechanism, an automatic welding wire feeding mechanism and a supporting assembly are arranged on the equipment main body, the welding wire pressing wheel is arranged on one side of the wire guide rod in a lifting mode, the welding wire shearing mechanism driven by the welding wire shearing cylinder is arranged on the other side of the wire guide rod, the automatic welding wire feeding mechanism driven by the welding wire feeding servo motor is arranged on one side, away from the wire guide rod, of the welding wire shearing mechanism, the pressure grooved wheel is further arranged on the equipment main body below the welding wire pressing wheel, and the supporting assembly is located at the bottom end of the equipment main body. The invention has the beneficial effects that: adopt servo control system, can freely adjust the length of welding wire, make the device can be fit for the part production demand of multiple external diameter, through supporting component's design, can improve device stability, can be convenient for again remove.
Description
Technical Field
The invention relates to a welding wire press-in device, in particular to an automatic welding wire press-in device, and belongs to the technical field of processing of air conditioner cushion partition plates.
Background
The liquid accumulator is an important part of the compressor, plays roles in storage, gas-liquid separation, filtration, noise reduction and refrigerant buffering, and cannot ensure that the refrigerant can be completely vaporized when the air-conditioning system operates; namely, the liquid refrigerant can enter the liquid storage device from the refrigerant coming out of the evaporator, the liquid refrigerant which is not vaporized can directly fall on the cylinder bottom of the liquid storage device because the refrigerant is heavier than gas, and the vaporized refrigerant enters the compressor from the outlet of the liquid storage device, so that the liquid impact caused by the liquid refrigerant sucked by the compressor is prevented.
The traditional liquid storage device cushion clapboard processing technology comprises the following steps: rolling a solder groove on the pad separator, beating the solder by a looping machine, and manually penetrating the solder. The process is many, the cost of labor is high, and efficiency is low.
Disclosure of Invention
The present invention is directed to solve the above problems and to provide an automatic welding wire pressing device, which employs a servo control system to freely adjust the length of a welding wire, so that the device can meet the production requirements of parts with various outer diameters, and uses a second lifting plate to support the device in a working state through the design of a support assembly, so as to improve the stability of the device.
The invention realizes the purpose through the following technical scheme, and the automatic welding wire pressing-in device comprises a device main body, wherein a pressure sheave, a welding wire pressing wheel, a welding wire shearing cylinder, a welding wire feeding servo motor, a wire guide rod, a welding wire shearing mechanism, an automatic welding wire feeding mechanism and a supporting component are arranged on the device main body, the welding wire pressing wheel is arranged on one side of the wire guide rod in a lifting mode, the welding wire shearing mechanism driven by the welding wire shearing cylinder is arranged on the other side of the wire guide rod, the automatic welding wire feeding mechanism driven by the welding wire feeding servo motor is arranged on one side, away from the wire guide rod, of the welding wire shearing mechanism, the pressure sheave is further arranged on the device main body below the welding wire pressing wheel, the supporting component is positioned at the bottom end of the device main body, and the supporting component comprises a box body, a second lifting plate, a first lifting plate, a driven threaded rod, a second threaded sleeve, a second lifting plate, a first lifting plate, a second threaded sleeve and a second lifting plate, a second screw rod and a second screw rod, The box comprises an active threaded rod, a first threaded sleeve and a driving assembly, wherein the first lifting plate and the second lifting plate are located below the box body, the first lifting plate and the second lifting plate synchronously and reversely move up and down through the driving assembly, and two sets of moving wheels are arranged on the bottom surface of the first lifting plate.
Preferably, first threaded sleeve pipe vertical setting, first threaded sleeve pipe slide pass the diapire of box, are located the outside one end fixed connection of box is on the top surface of first lifter plate, are located the inside one end screw thread cover of box is put outside vertical initiative threaded rod bottom first threaded sleeve pipe bilateral symmetry is provided with two sets of vertical second threaded sleeve pipes, and is two sets of the outside slip cover in second threaded sleeve pipe middle section has put the holding sleeve pipe, the holding sleeve pipe is fixed in on the box diapire, the bottom fixed connection that the second threaded sleeve pipe is in the box outside is on the top surface of second lifter plate, the one end screw thread cover that the second threaded sleeve pipe is in the box inside is put outside vertical driven threaded rod bottom.
Preferably, the top section of drive threaded rod and driven threaded rod all rotates through the bearing and connects on the mounting panel, mounting panel fixed mounting is inside the box, mounting panel fixedly connected with driven sprocket is passed on the driven threaded rod top, mounting panel fixedly connected with drive sprocket is passed on the drive threaded rod top, has the chain belt at a set of drive sprocket and the outside cover of two sets of driven sprocket, drive sprocket upper end center fixedly connected with elevator motor's bent axle, elevator motor fixed mounting is inside the box, driven threaded rod and drive threaded rod screw thread opposite direction.
Preferably, two groups of vertical retaining rods are arranged in parallel with the first threaded sleeve, the two groups of retaining rods are symmetrically arranged on two sides of the first threaded sleeve, the two groups of retaining rods penetrate through the opening of the bottom wall of the box body in a sliding mode, and the bottom end of each retaining rod outside the box body is fixedly connected to the top face of the first lifting plate.
Preferably, the second lifting plate is provided with a notch opposite to the first lifting plate, the first lifting plate is of a rectangular plate-shaped structure, and the length and the width of the notch are greater than those of the first lifting plate.
Preferably, the box body is fixedly connected to the equipment main body through bolts, and the box body is a hollow square box.
A solder automatic pressing-in process of an automatic welding wire pressing-in device comprises the following steps:
the automatic welding wire feeding mechanism automatically feeds welding wires into the wire guide rod, the welding wire cutting cylinder is started to cut the welding wires by using the welding wire cutting mechanism, the required welding wires are pre-stored in the wire guide rod, the pressure groove wheel is started to press the outer diameter surface of a part to form a groove with the width smaller than the diameter of the welding wires, and the welding wire pressing wheel is lowered after the groove pressing is completed;
and starting the automatic wire feeding mechanism of the welding wire again to feed the required welding wire pre-hidden in the wire guide rod into the joint of the welding wire pressing wheel and the component, and automatically pressing the welding wire into the groove by using the welding wire pressing wheel, namely completing the automatic pressing of the welding wire.
The invention has the beneficial effects that: according to the automatic welding wire feeding device, the servo control system is adopted by the automatic welding wire feeding mechanism, the length of the welding wire can be freely adjusted, so that the device can meet the production requirements of parts with various outer diameters, the second lifting plate is used for supporting in the working state of the device through the design of the supporting assembly, the stability of the device can be improved, when the device needs to be moved, the second lifting plate is lifted, the first lifting plate is lowered, and the moving wheel arranged at the bottom of the first lifting plate can be used for conveniently moving the device.
Drawings
FIG. 1 is a front view of the present invention;
FIG. 2 is a side view of the present invention;
FIG. 3 is a front view of the support assembly of the present invention;
FIG. 4 is a side view of the support assembly of the present invention;
fig. 5 is a schematic view of the internal structure of the case of the present invention.
In the figure: the welding wire cutting device comprises a 1 grooved pulley, a 2 welding wire pressing wheel, a 3 welding wire shearing cylinder, a 4 welding wire feeding servo motor, a 5 wire guiding rod, a 6 welding wire shearing mechanism, a 7 welding wire automatic feeding mechanism, an 8 box body, a 9 equipment main body, a 10 driven chain wheel, a 11 chain belt, a 12 driving chain wheel, a 13 lifting motor, a 14 mounting plate, a 15 driven threaded rod, a 16 retaining sleeve, a 17 driving threaded rod, a 18 retaining rod, a 19 first threaded sleeve, a 20 second threaded sleeve, a 21 notch, a 22 first lifting plate, a 23 moving wheel and a 24 second lifting plate.
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.
Referring to fig. 1 to 5, an automatic welding wire pressing device includes a device main body 9, a pressure sheave 1, a welding wire pressing wheel 2, a welding wire shearing cylinder 3, a welding wire feeding servo motor 4, a wire guide rod 5, a welding wire shearing mechanism 6, an automatic welding wire feeding mechanism 7 and a support assembly are mounted on the device main body 9, the welding wire pressing wheel 2 is mounted on one side of the wire guide rod 5 in a lifting manner, the welding wire shearing mechanism 6 driven by the welding wire shearing cylinder 3 is mounted on the other side of the wire guide rod 5, the automatic welding wire feeding mechanism 7 driven by the welding wire feeding servo motor 4 is mounted on one side of the welding wire shearing mechanism 6 away from the wire guide rod 5, the pressure sheave 1 is further mounted on the device main body 9 below the welding wire pressing wheel 2, the support assembly is located at the bottom end of the device main body 9, and includes a box 8, a second lifting plate 24, and a second lifting plate, First lifter plate 22, driven threaded rod 15, second threaded sleeve 20, initiative threaded rod 17, first threaded sleeve 19 and drive assembly, first lifter plate 22 and second lifter plate 24 are located box 8 below, and first lifter plate 22 and second lifter plate 24 reciprocate through drive assembly synchronization reversal first lifter plate 22 bottom surface is installed two sets of removal wheels 23.
As a technical optimization scheme of the present invention, the first threaded sleeve 19 is vertically arranged, the first threaded sleeve 19 slides through the bottom wall of the box body 8, one end of the first threaded sleeve located outside the box body 8 is fixedly connected to the top surface of the first lifting plate 22, one end of the first threaded sleeve located inside the box body 8 is sleeved outside the bottom end of the vertical driving threaded rod 17, two sets of vertical second threaded sleeves 20 are symmetrically arranged on two sides of the first threaded sleeve 19, a retaining sleeve 16 is slidably sleeved outside the middle section of the two sets of second threaded sleeves 20, the retaining sleeve 16 is fixed on the bottom wall of the box body 8, the bottom end of the second threaded sleeve 20 located outside the box body 8 is fixedly connected to the top surface of the second lifting plate 24, and one end of the second threaded sleeve 20 located inside the box body 8 is sleeved outside the bottom end of the vertical driven threaded rod 15.
As a technical optimization scheme of the invention, the top sections of the driving threaded rod 17 and the driven threaded rod 15 are rotatably connected to the mounting plate 14 through bearings, the mounting plate 14 is fixedly mounted inside the box body 8, the top end of the driven threaded rod 15 penetrates through the mounting plate 14 and is fixedly connected with the driven sprocket 10, the top end of the driving threaded rod 17 penetrates through the mounting plate 14 and is fixedly connected with the driving sprocket 12, chain belts 11 are sleeved outside one group of driving sprockets 12 and two groups of driven sprockets 10, the center of the upper end of the driving sprocket 12 is fixedly connected with a crankshaft of a lifting motor 13, the lifting motor 13 is fixedly mounted inside the box body 8, and the screw directions of the driven threaded rod 15 and the driving threaded rod 17 are opposite.
As a technical optimization scheme of the invention, vertical retaining rods 18 are arranged in parallel with the first threaded sleeve 19, two groups of retaining rods 18 are symmetrically arranged on two sides of the first threaded sleeve 19, the two groups of retaining rods 18 both slide through an opening on the bottom wall of the box body 8, and the bottom end of the retaining rod 18 positioned outside the box body 8 is fixedly connected to the top surface of a first lifting plate 22.
As a technical optimization scheme of the present invention, the second lifting plate 24 is provided with a notch 21 opposite to the first lifting plate 22, the first lifting plate 22 is in a rectangular plate-shaped structure, and the length and width of the notch 21 is greater than the length and width of the first lifting plate 22.
As a technical optimization scheme of the invention, the box body 8 is fixedly connected to the equipment main body 9 through bolts, and the box body 8 is a hollow square box.
A solder automatic pressing-in process of an automatic welding wire pressing-in device comprises the following steps:
the automatic welding wire feeding mechanism 7 automatically feeds welding wires into the wire guide rod 5, the welding wire cutting cylinder 3 is started to cut the welding wires by using the welding wire cutting mechanism 6, the required welding wires are pre-stored in the wire guide rod 5, the pressure sheave 1 is started to press the outer diameter surface of a part to form a groove with the width smaller than the diameter of the welding wires, and the welding wire pressing wheel 2 is lowered after the groove pressing is completed;
and starting the automatic welding wire feeding mechanism 7 again to feed the required welding wire pre-stored in the wire guide rod 5 to the joint of the welding wire pressing wheel 2 and the component, and automatically pressing the welding wire into the groove by using the welding wire pressing wheel 2, namely completing the automatic pressing of the welding wire.
The device adopts the combination of a programmable PLC element and a touch screen to compile an autonomous operation panel, develops a digital control system and an operation system by self, adopts a servo control system for the automatic wire feeding mechanism of the welding wire, can freely adjust the length of the welding wire, and can meet the production requirements of parts with various outer diameters.
When the automatic welding wire pressing-in device is used, the second lifting plate 24 is used for supporting the welding wire in a grounding way in a working state, the grounding area is increased, the stability of the device is improved, when the device needs to be moved, the lifting motor 13 is started to drive the driving chain wheel 12 to rotate, the driven chain wheel 10, the driving threaded rod 17 and the driven threaded rod 15 rotate along with the driving chain wheel 12 in the same direction, because the screw thread directions of the driving screw rod 17 and the driven screw rod 15 are opposite, the first screw sleeve 19 sleeved on the driving screw rod 17 and the second screw sleeve 20 sleeved on the driven screw rod 15 synchronously move in opposite directions, when the second lifting plate 24 is pulled up by moving the second screw sleeve 20 upwards, and the first lifting plate 22 is lowered by moving the first screw sleeve 19 downwards, the device can be moved conveniently when the device is supported on the ground by the moving wheel 23 arranged at the bottom of the first lifting plate 22.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
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 (7)
1. An automatic welding wire pressing-in device comprises a device main body (9), and is characterized in that: install on equipment main part (9) and press sheave (1), welding wire pinch roller (2), welding wire to cut cylinder (3), welding wire and send a servo motor (4), godet pole (5), welding wire to cut mechanism (6), the automatic thread feeding mechanism (7) of welding wire and supporting component, the lifting of welding wire pinch roller (2) is installed in godet pole (5) one side godet pole (5) opposite side is installed and is cut mechanism (6) through welding wire that cylinder (3) driven welding wire is cut, and one side that godet pole (5) were kept away from in welding wire cut mechanism (6) is installed and is sent a servo motor (4) driven welding wire automatic thread feeding mechanism (7) through welding wire still be installed on equipment main part (9) of welding wire pinch roller (2) below and is pressed sheave (1), supporting component is located equipment main part (9) bottom department, supporting component includes box (8), Second lifter plate (24), first lifter plate (22), driven threaded rod (15), second threaded sleeve pipe (20), initiative threaded rod (17), first threaded sleeve pipe (19) and drive assembly, first lifter plate (22) and second lifter plate (24) are located box (8) below, and first lifter plate (22) and second lifter plate (24) reciprocate through drive assembly synchronous reversal first lifter plate (22) bottom surface is installed two sets of wheels (23) that remove.
2. The automatic welding wire pressing device according to claim 1, wherein: the first threaded sleeve (19) is vertically arranged, the first threaded sleeve (19) penetrates through the bottom wall of the box body (8) in a sliding manner, one end, positioned outside the box body (8), of the first threaded sleeve is fixedly connected to the top surface of the first lifting plate (22), one end, positioned inside the box body (8), of the first threaded sleeve is sleeved outside the bottom end of the vertical driving threaded rod (17), two groups of vertical second threaded sleeves (20) are symmetrically arranged at two sides of the first threaded sleeve (19), a retaining sleeve (16) is sleeved outside the middle section of the two groups of second threaded sleeves (20) in a sliding manner, the holding sleeve (16) is fixed on the bottom wall of the box body (8), the bottom end of the second threaded sleeve (20) outside the box body (8) is fixedly connected on the top surface of the second lifting plate (24), one end of the second threaded sleeve (20) in the box body (8) is sleeved outside the bottom end of the vertical driven threaded rod (15) in a threaded manner.
3. The automatic welding wire pressing device according to claim 2, wherein: the top segment of drive threaded rod (17) and driven threaded rod (15) all rotates through the bearing and connects on mounting panel (14), mounting panel (14) fixed mounting is inside box (8), mounting panel (14) fixedly connected with driven sprocket (10) is passed on driven threaded rod (15) top, mounting panel (14) fixedly connected with drive sprocket (12) is passed on drive threaded rod (17) top, has chain belt (11) at a set of drive sprocket (12) and two sets of driven sprocket (10) outside cover, the spindle of drive sprocket (12) upper end center fixedly connected with elevator motor (13), elevator motor (13) fixed mounting is inside box (8), driven threaded rod (15) and drive threaded rod (17) screw thread spiral opposite direction.
4. The automatic welding wire pressing device according to claim 2, wherein: vertical retaining rods (18) are arranged in parallel with the first threaded sleeve (19), two groups of retaining rods (18) are symmetrically arranged on two sides of the first threaded sleeve (19), the two groups of retaining rods (18) penetrate through an opening in the bottom wall of the box body (8) in a sliding mode, and the bottom end of each retaining rod (18) located outside the box body (8) is fixedly connected to the top surface of the first lifting plate (22).
5. The automatic welding wire pressing device according to claim 1, wherein: the second lifting plate (24) is provided with a notch (21) opposite to the first lifting plate (22), the first lifting plate (22) is of a rectangular plate-shaped structure, and the length and the width of the notch (21) are larger than those of the first lifting plate (22).
6. The automatic welding wire pressing device according to claim 1, wherein: the box body (8) is fixedly connected to the equipment main body (9) through bolts, and the box body (8) is a hollow square box.
7. The automatic solder pressing-in process of the automatic welding wire pressing-in device is characterized in that: the method comprises the following steps:
the automatic welding wire feeding mechanism (7) automatically feeds welding wires into the wire guide rod (5), the welding wire shearing cylinder (3) is started to shear the welding wires by using the welding wire shearing mechanism (6), the required welding wires are pre-stored in the wire guide rod (5), the pressure sheave (1) is started to press the outer diameter surface of a part to form a groove with the width smaller than the diameter of the welding wires, and the welding wire pressing wheel (2) is lowered after the groove pressing is completed;
and starting the automatic wire feeding mechanism (7) of the welding wire again to feed the welding wire which is pre-stored in the wire guide rod (5) to the joint of the welding wire pressing wheel (2) and the component, and automatically pressing the welding wire into the groove by using the welding wire pressing wheel (2), namely completing the automatic pressing of the welding wire.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110733365.5A CN113458668A (en) | 2021-06-30 | 2021-06-30 | Automatic welding wire pressing-in device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110733365.5A CN113458668A (en) | 2021-06-30 | 2021-06-30 | Automatic welding wire pressing-in device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113458668A true CN113458668A (en) | 2021-10-01 |
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ID=77874163
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110733365.5A Pending CN113458668A (en) | 2021-06-30 | 2021-06-30 | Automatic welding wire pressing-in device |
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| Country | Link |
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| CN (1) | CN113458668A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050224485A1 (en) * | 2004-04-08 | 2005-10-13 | Illinois Tool Works Inc. | Wire feeder |
| CN106736051A (en) * | 2016-12-20 | 2017-05-31 | 广州汉源新材料股份有限公司 | A kind of manufacture device and manufacture method of limit for height type preformed soldering |
| CN107890208A (en) * | 2017-11-11 | 2018-04-10 | 共同科技开发有限公司 | A kind of teaching multifunctional platform |
| CN110788403A (en) * | 2019-11-05 | 2020-02-14 | 含山县荣源金属制品有限公司 | Grooving screw rolling machine |
| CN212896130U (en) * | 2020-08-05 | 2021-04-06 | 江苏省水利勘测设计研究院有限公司 | Flood prevention box for hydraulic engineering design |
-
2021
- 2021-06-30 CN CN202110733365.5A patent/CN113458668A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050224485A1 (en) * | 2004-04-08 | 2005-10-13 | Illinois Tool Works Inc. | Wire feeder |
| CN106736051A (en) * | 2016-12-20 | 2017-05-31 | 广州汉源新材料股份有限公司 | A kind of manufacture device and manufacture method of limit for height type preformed soldering |
| CN107890208A (en) * | 2017-11-11 | 2018-04-10 | 共同科技开发有限公司 | A kind of teaching multifunctional platform |
| CN110788403A (en) * | 2019-11-05 | 2020-02-14 | 含山县荣源金属制品有限公司 | Grooving screw rolling machine |
| CN212896130U (en) * | 2020-08-05 | 2021-04-06 | 江苏省水利勘测设计研究院有限公司 | Flood prevention box for hydraulic engineering design |
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Application publication date: 20211001 |