CN110567677B - Imitative undulant wall resistance measuring device of fin - Google Patents
Imitative undulant wall resistance measuring device of fin Download PDFInfo
- Publication number
- CN110567677B CN110567677B CN201910716803.XA CN201910716803A CN110567677B CN 110567677 B CN110567677 B CN 110567677B CN 201910716803 A CN201910716803 A CN 201910716803A CN 110567677 B CN110567677 B CN 110567677B
- Authority
- CN
- China
- Prior art keywords
- rod
- wall surface
- base
- reciprocating screw
- screw rod
- 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
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M10/00—Hydrodynamic testing; Arrangements in or on ship-testing tanks or water tunnels
Landscapes
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Aerodynamic Tests, Hydrodynamic Tests, Wind Tunnels, And Water Tanks (AREA)
Abstract
The invention discloses a fin-like fluctuation wall surface resistance measuring device which comprises a water tank, a support column, a base, a tension sensor, a guide rod base, a guide rod, a reciprocating screw rod bearing seat, a reciprocating screw rod, a sliding block, a driving motor, a connecting block, a connecting rod, a fixing rod and a wall surface, wherein the water tank is provided with a water inlet and a water outlet; the device can realize the wavy motion of the wall surface in water, the frequency and the wavelength of the fluctuation can be adjusted, and the water flow resistance on the wall surface can be quantitatively measured.
Description
Technical Field
The invention relates to the field of fluid resistance measurement, in particular to a wall resistance measuring device simulating fin fluctuation.
Background
In the swimming process of the Nile ghost fish, the dorsal fins of the fish move in a wave shape and interact with surrounding fluid, so that the resistance and the swimming efficiency of the swimming are influenced. Although the swimming mechanism of fin wave motion is not completely clear at present, research on the kinematics and swimming characteristics of the long-fin-imitated fish is continuously carried out. In the kinematic experiment measurement, for the experiment related to fish swimming, the measurement of the kinetic parameters and swimming parameters is mostly involved.
The traditional fluid resistance measuring device has high requirements on the waterproof sealing performance of the experimental device, most of the fluid resistance measuring device is used for placing a model to be measured at a section to be measured, and the model is not suitable for a model with motion deformation, so that the device for measuring the wall resistance capable of realizing smooth fluctuation is designed for researching the low resistance and the high efficiency of the fish swimming by researching the resistance influence of long fin fluctuation on a research object and the drag reduction research of the fluctuation fin of the fish.
Disclosure of Invention
In order to research the influence of fluid resistance on fin fluctuation of fish in the swimming process, the invention discloses a fin fluctuation imitating wall resistance measuring device, which can realize the wave-shaped motion of a wall surface in water. The specific technical scheme is as follows:
a fin-like fluctuation wall surface resistance measuring device is characterized by comprising a water tank, a supporting column, a base, a tension sensor, a guide rod base, a guide rod, a reciprocating screw rod bearing seat, a reciprocating screw rod, a sliding block, a driving motor, a connecting block, a connecting rod, a fixing rod and a wall surface;
four corners of the base are slidably supported on the four support columns, the water tank is placed at the lower part of the base, and the front end and the rear end of the water tank are connected into the water channel; the tension sensors are arranged in the two support columns behind the waterway flow direction and connected with the base;
the two guide rod bases are respectively fixed on two sides of the upper surface of the base, the sliding block is provided with a unthreaded hole and a threaded hole, the guide rod penetrates through the unthreaded hole of the sliding block, two ends of the guide rod are respectively fixed on the two guide rod bases, the driving motor and the reciprocating screw rod bearing seat are also fixed on the base, the reciprocating screw rod penetrates through the threaded hole of the sliding block, one end of the reciprocating screw rod is connected with the driving motor, and the other end of the reciprocating screw rod is supported in the reciprocating screw rod bearing seat; the middle part of the base is provided with a hole, the sliding block penetrates through the hole on the base and is fixedly connected with the connecting block, the connecting block is connected with the connecting rod, the connecting rod is fixedly connected with the wall surface, and the lower end of the wall surface is immersed in the water tank;
three sets of wall surface driving devices are formed by the guide rod, the reciprocating screw rod bearing seat, the reciprocating screw rod, the sliding block, the driving motor, the connecting block and the connecting rod, and the three sets of wall surface driving devices are arranged in parallel at equal intervals along the flow direction of the water path; one end of each of the two fixing rods is fixedly connected to the base, the two fixing rods are symmetrically arranged on the front side and the rear side of the three sets of wall surface driving devices, and the three connecting rods and the two fixing rods are fixedly connected with one wall surface to form a fluctuation period.
Furthermore, idler wheels are installed at four corners of the base, idler wheel sliding grooves are correspondingly formed in the four supporting columns, and the idler wheels can slide in the idler wheel sliding grooves.
Furthermore, the connecting block is concave, the lower end surface of the connecting block is provided with a special-shaped groove, the special-shaped groove comprises a round hole groove and a rectangular groove which are communicated, and the diameter of the round hole groove is larger than the width of the rectangular groove; the connecting rod is a T-shaped sliding rod, a cross rod of the connecting rod can slide in the round hole groove, and a vertical rod of the connecting rod is used for connecting the wall surface.
The connecting device further comprises thread adjusting rods, wherein internal threads are formed at two ends of the round hole groove of the connecting block, the two thread adjusting rods are connected to two ends of the connecting block through the internal threads, and the position of the connecting rod along the water flow direction is adjusted by adjusting the screwing-in depth of the thread adjusting rods;
the joint of the base and the fixed rod is provided with a sliding groove along the water flow direction, and the fluctuation wavelength of the wall surface is adjusted by adjusting the position of the fixed rod in the sliding groove and the position of the connecting rod in the connecting block.
Furthermore, the hole on the base is a rectangular hole, and the width of the rectangular hole is larger than the stroke of the sliding block.
Furthermore, the water tank is a rectangular open water tank formed by bonding three transparent ABS plates.
Furthermore, the wall surface is a rubber plate with a stainless steel net sandwiched in the center.
The invention has the following beneficial effects:
the invention provides a novel wall resistance measuring device, the wall can imitate the dorsal fin of a fish to do wavy motion in water, the resistance can be quantitatively measured, the structure is simple, and the operation is simple and convenient. The resistance measuring device can also be used for measuring the curved wall surface within a certain curvature range, can also be used for measuring the resistance of the horizontal wall surface, and has wide application range.
Drawings
FIG. 1 is a plan view of a wall resistance measuring device simulating fin wave motion;
FIG. 2 is a sectional view of a front view of a wall resistance measuring device imitating fin undulation;
FIG. 3 is a partial schematic view of a tension sensor;
FIG. 4 is a schematic view of the construction of the connector block;
FIG. 5 is a schematic view of a wall adjustment assembly;
fig. 6 is a left side view of the wall resistance measuring device imitating fin undulation.
The reference numbers in the figure are water tank 1, base 2, support column 3, tension sensor 4, guide rod base 5, guide rod 6, reciprocating screw rod bearing seat 7, reciprocating screw rod 8, slide block 9, coupling 10, driving motor 11, wall surface 12, connecting block 13, circular groove 131, rectangular groove 132, roller base 14, roller 15, connecting rod 16, threaded adjusting rod 17, fixing rod 18 and nut 19.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and preferred embodiments, and the objects and effects of the present invention will become more apparent, and the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1-6, a fin-like fluctuation wall surface resistance measuring device comprises a water tank 1, a support column 3, a base 2, a tension sensor 4, a guide rod base 5, a guide rod 6, a reciprocating screw rod bearing seat 7, a reciprocating screw rod 8, a slider 9, a driving motor 11, a connecting block 13, a connecting rod 16, a fixing rod 18 and a wall surface 12;
four corners of the base 2 are slidably supported on the four support columns 3, the water tank 1 is placed at the lower part of the base 2, and the front end and the rear end of the water tank 1 are connected into a water path; the tension sensors 4 are arranged in the two support columns 3 behind the waterway flow direction and connected with the base 2;
the guide rod bases 5 are L-shaped plates, the two guide rod bases 5 are respectively fixed on two sides of the upper surface of the base 2, the guide rod 6 is a smooth round rod and is positioned above the reciprocating screw rod 8, the slide block 9 is provided with a unthreaded hole and a threaded hole, the guide rod 6 penetrates through the unthreaded hole of the slide block 9, two ends of the guide rod 6 are respectively fixed on the two guide rod bases 5 through screws, the driving motor 11 and the reciprocating screw rod bearing seat 7 are also fixed on the base 2, the reciprocating screw rod 8 penetrates through the threaded hole of the slide block 9, one end of the reciprocating screw rod passes through the coupling 10 and is connected with the driving motor 11, and the other end of the reciprocating screw rod bearing seat is supported in the reciprocating screw rod bearing seat 7; a hole is formed in the middle of the base 2, the sliding block 9 penetrates through the hole in the base 2 to be fixedly connected with the connecting block 13, the connecting block 13 is connected with the connecting rod 16, the connecting rod 16 is fixedly connected with the wall surface 12, and the lower end of the wall surface 12 is immersed in the water tank; the axes of the driving motor 11, the shaft coupling 10, the reciprocating screw 8 and the reciprocating screw shaft bearing 7 are positioned on the same horizontal axis. The driving motor 11 is a servo motor, and when the reciprocating screw 8 is driven by the driving motor 11 to rotate circumferentially, the slide block 9 makes linear motion along the axial direction of the screw.
Three sets of wall surface driving devices are formed by the guide rod 6, the reciprocating screw rod bearing seat 7, the reciprocating screw rod 8, the sliding block 9, the driving motor 11, the connecting block 13 and the connecting rod 16, and the three sets of wall surface driving devices are arranged in parallel at equal intervals along the flow direction of the water channel; one end of each of the two fixing rods 18 is fixedly connected to the base 2, the two fixing rods 18 are symmetrically arranged on the front side and the rear side of the three sets of wall surface driving devices, and the three connecting rods 16 and the two fixing rods 18 are fixedly connected with one wall surface 12 to form a fluctuation period.
As one embodiment, the reciprocating screw rod 8 is provided with two thread grooves which have the same thread pitch and opposite rotation directions, and the two thread grooves are connected at two ends of the reciprocating screw rod 8 through transition curves. When the slide block 9 moves to the left and right limit positions of the thread groove of the reciprocating screw rod 8, the slide block slides in the other direction under the pushing of the thread groove to realize the reciprocating linear motion.
As an embodiment, four corners of the base 2 are provided with roller bases 14 and rollers 15, four supporting columns 3 correspondingly start roller sliding grooves, and the rollers can slide in the roller sliding grooves.
As an embodiment, the connecting block 13 is in a shape of a Chinese character 'ao', a special-shaped groove is formed on the lower end surface of the connecting block, the special-shaped groove comprises a circular hole groove 131 and a rectangular groove 132 which are communicated, and the diameter of the circular hole groove 131 is larger than the width of the rectangular groove 132; the connecting rod 16 is a T-shaped sliding rod, the cross rod of which can slide in the circular hole groove 131, and the vertical rod of which is used for connecting the wall surface 12.
As one embodiment, the water-saving device further comprises a thread adjusting rod 17, wherein internal threads are formed at two ends of the circular hole groove 131 of the connecting block 13, the two thread adjusting rods 17 are connected to two ends of the connecting block 13 through the internal threads, and the position of the connecting rod 16 along the water flow direction is adjusted by adjusting the screwing depth of the thread adjusting rods 17;
as an embodiment, as shown in fig. 1, the hole on the base 2 is a rectangular hole, and the width of the rectangular hole is larger than the stroke of the slider 9.
As an embodiment, as shown in fig. 2, the water tank 1 is a rectangular open water tank formed by bonding three transparent ABS plates, and the front and rear ends of the rectangular open water tank are connected to the water path.
In one embodiment, the wall 12 is a rubber plate with a stainless steel net sandwiched in the center, so that the rubber plate can maintain a good waveform when being impacted by water flow. The waterline height in basin 1 is higher than the bottom of wall 12, is not higher than the top of wall 12, avoids the rod end to sink into the aquatic and produces the error to measuring. At the same time, the wall 12 is at a distance from the bottom of the tank 1, which reduces the influence of the flow near the wall.
As shown in fig. 6, the first and the end of the wall surface 12 are respectively bonded with a fixing rod 18, three connecting rods 13 are uniformly bonded in the middle of the wall surface 12, and the fixing rods 18 are equal to the connecting rods 13 and the adjacent connecting rods 13 in distance. The round bar part of the fixing bar 18 and the connecting bar 13 bonded with the wall surface 12 is subjected to filing treatment, and a flat bonding surface is added to increase the contact area bonded with the wall surface 12. The threaded rod end of the fixing rod 18 is vertically installed through a long groove on the base 2 and fixed on the base 2 through an upper nut 19 and a lower nut 19, and the inner diameter of each nut 19 is larger than the width of the groove.
As shown in fig. 1 and 5, when the wall surface wavelength needs to be changed, the wall surface wavelength can be changed by adjusting the position of the fixing rod 18 in the long groove and changing the position of the connecting rod 13 by rotating the screw adjustment lever 17.
As shown in fig. 5, three sets of identical wall surface driving assemblies can make the wall surface follow the fin wave of the fish to make a complete cycle of wave motion by controlling the energizing timing of the respective driving motors.
When the driving motor of the fin-like fluctuation wall resistance measuring device provided by the embodiment continuously runs, the wall surface can make wave motion in water by imitating the dorsal fins of fish, and the magnitude of the resistance can be quantitatively measured. When the driving motor stops, the curvature of the wall surface can be changed by adjusting the positions of the fixing rod and the connecting rod, so that the device can be used for measuring the curved wall surface within a certain curvature range and can also be used for measuring the resistance of the horizontal wall surface.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and although the invention has been described in detail with reference to the foregoing examples, it will be apparent to those skilled in the art that various changes in the form and details of the embodiments may be made and equivalents may be substituted for elements thereof. All modifications, equivalents and the like which come within the spirit and principle of the invention are intended to be included within the scope of the invention.
Claims (6)
1. A fin-like fluctuation wall surface resistance measuring device is characterized by comprising a water tank (1), a support column (3), a base (2), a tension sensor (4), a guide rod base (5), a guide rod (6), a reciprocating screw rod bearing seat (7), a reciprocating screw rod (8), a sliding block (9), a driving motor (11), a connecting block (13), a connecting rod (16), a fixing rod (18) and a wall surface (12);
four corners of the base (2) are slidably supported on the four support columns (3), the water tank (1) is placed at the lower part of the base (2), and the front end and the rear end of the water tank (1) are connected into a water path; the tension sensors are arranged in the two support columns (3) behind the waterway flow direction and connected with the base (2);
the two guide rod bases (5) are respectively fixed on two sides of the upper surface of the base (2), a unthreaded hole and a threaded hole are formed in the sliding block (9), the guide rod (6) penetrates through the unthreaded hole of the sliding block (9), two ends of the guide rod (6) are respectively fixed on the two guide rod bases (5), the driving motor (11) and the reciprocating screw rod bearing seat (7) are also fixed on the base (2), the reciprocating screw rod (8) penetrates through the threaded hole of the sliding block (9), one end of the reciprocating screw rod is connected with the driving motor (11), and the other end of the reciprocating screw rod is supported in the reciprocating screw rod bearing seat (7); a hole is formed in the middle of the base (2), the sliding block (9) penetrates through the hole in the base (2) and is fixedly connected with the connecting block (13), the connecting block (13) is connected with the connecting rod (16), the connecting rod (16) is fixedly connected with the wall surface (12), and the lower end of the wall surface (12) is immersed in the water tank;
three sets of wall surface driving devices are formed by the guide rod (6), the reciprocating screw rod bearing seat (7), the reciprocating screw rod (8), the sliding block (9), the driving motor (11), the connecting block (13) and the connecting rod (16), and the three sets of wall surface driving devices are arranged in parallel at equal intervals along the flow direction of the water path; one end of each of the two fixing rods (18) is fixedly connected to the base (2), the two fixing rods (18) are symmetrically arranged on the front side and the rear side of the three sets of wall surface driving devices, and the three connecting rods (16) and the two fixing rods (18) are fixedly connected with one wall surface (12) to form a fluctuation period;
the connecting block (13) is in a concave shape, the lower end face of the connecting block is provided with a special-shaped groove, the special-shaped groove comprises a round hole groove (131) and a rectangular groove (132) which are communicated, and the diameter of the round hole groove (131) is larger than the width of the rectangular groove (132); the connecting rod (16) is a T-shaped sliding rod, a cross rod of the connecting rod can slide in the round hole groove (131), and a vertical rod of the connecting rod is used for connecting the wall surface (12).
2. The fin-like wave wall resistance measuring device according to claim 1, wherein rollers are mounted at four corners of the base (2), roller sliding grooves are correspondingly formed in four supporting columns (3), and the rollers can slide in the roller sliding grooves.
3. The wall resistance measuring device of the imitated fin fluctuation according to claim 1, characterized by further comprising thread adjusting rods (17), wherein two ends of the round hole groove (131) of the connecting block (13) are provided with internal threads, the two thread adjusting rods (17) are connected to two ends of the connecting block (13) through the internal threads, and the position of the connecting rod (16) along the water flow direction is adjusted by adjusting the screwing depth of the thread adjusting rods (17);
the connection part of the base (2) and the fixed rod (18) is provided with a sliding groove along the water flow direction, and the fluctuation wavelength of the wall surface (12) is adjusted by adjusting the position of the fixed rod (18) in the sliding groove and the position of the connecting rod (16) in the connecting block (13).
4. The fin-like wave wall resistance measuring device according to claim 1, wherein the hole on the base (2) is a rectangular hole, and the width of the rectangular hole is larger than the stroke of the sliding block (9).
5. The fin-like fluctuation wall surface resistance measuring device according to claim 1, wherein the water tank (1) is a rectangular open water tank formed by bonding three transparent ABS plates.
6. The fin-like wave wall resistance measuring device according to claim 1, wherein the wall surface (12) is a rubber plate with a stainless steel net sandwiched in the center.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910716803.XA CN110567677B (en) | 2019-08-05 | 2019-08-05 | Imitative undulant wall resistance measuring device of fin |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910716803.XA CN110567677B (en) | 2019-08-05 | 2019-08-05 | Imitative undulant wall resistance measuring device of fin |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110567677A CN110567677A (en) | 2019-12-13 |
| CN110567677B true CN110567677B (en) | 2021-03-30 |
Family
ID=68774568
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910716803.XA Active CN110567677B (en) | 2019-08-05 | 2019-08-05 | Imitative undulant wall resistance measuring device of fin |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110567677B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4702431A (en) * | 1985-08-30 | 1987-10-27 | Daiwa Seiko, Inc. | Drag force measuring device for spinning reels |
| JPH01316623A (en) * | 1988-06-17 | 1989-12-21 | Okamoto Ind Inc | Fin simulation device |
| CN205981519U (en) * | 2016-08-04 | 2017-02-22 | 浙江工业大学 | Undulant wall resistance testing arrangement with adjustable |
| CN206019986U (en) * | 2016-09-28 | 2017-03-15 | 三峡大学 | In a kind of plane, fish swims the measuring equipment of resistance |
| CN208399102U (en) * | 2018-05-30 | 2019-01-18 | 浙江工业大学 | A kind of the bionic non-smooth surface drag reduction test device and simulator of variable curvature |
| CN208921393U (en) * | 2018-08-27 | 2019-05-31 | 浙江工业大学 | A kind of deformation wall surface fluid friction resistance test device and simulator |
-
2019
- 2019-08-05 CN CN201910716803.XA patent/CN110567677B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4702431A (en) * | 1985-08-30 | 1987-10-27 | Daiwa Seiko, Inc. | Drag force measuring device for spinning reels |
| JPH01316623A (en) * | 1988-06-17 | 1989-12-21 | Okamoto Ind Inc | Fin simulation device |
| CN205981519U (en) * | 2016-08-04 | 2017-02-22 | 浙江工业大学 | Undulant wall resistance testing arrangement with adjustable |
| CN206019986U (en) * | 2016-09-28 | 2017-03-15 | 三峡大学 | In a kind of plane, fish swims the measuring equipment of resistance |
| CN208399102U (en) * | 2018-05-30 | 2019-01-18 | 浙江工业大学 | A kind of the bionic non-smooth surface drag reduction test device and simulator of variable curvature |
| CN208921393U (en) * | 2018-08-27 | 2019-05-31 | 浙江工业大学 | A kind of deformation wall surface fluid friction resistance test device and simulator |
Non-Patent Citations (5)
| Title |
|---|
| Drag reduction in fish-like locomotion;D.S.BARRETT 等;《JOURNAL OF FLUID MECHANICS》;19991231;第392卷;第183-212页 * |
| Mechanical properties of a bio-inspired robotic knifefish with an undulatory propulsor;Oscar M Curet 等;《BIOINSPIRATION & BIOMIMETICS》;20110407;第1-9页 * |
| WATER TUNNEL EXPERIMENTAL INVESTIGATION ON THE DRAG REDUCTION CHARACTERISTICS OF THE TRAVELING WAVY WALL;YAO Yan 等;《JOURNAL OF HYDRODYNAMICS》;20110228;第23卷(第1期);正文第66页第1栏第3段至第2栏最后1段，图1 * |
| 不同厚度不同系列波状运动翼型的能量吸收特性;林燕 等;《热能动力工程》;20181231;第33卷(第12期);第131-140页 * |
| 仿生鲨鱼皮大面积成型技术及减阻性能研究;杨雪峰;《中国优秀硕士学位论文全文数据库工程科技Ⅰ辑》;20190215(第2（2019）期);正文第53页，图4.1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110567677A (en) | 2019-12-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110849581B (en) | Deformed wall surface resistance testing device based on fish body surface structure | |
| CN110567677B (en) | Imitative undulant wall resistance measuring device of fin | |
| WO2022194148A1 (en) | Bionic fish propelling device and control method therefor | |
| CN109696294B (en) | Device for exploring tidal flat dynamic landform under biological disturbance | |
| CN103592102A (en) | Gate type internal solitary wave maker | |
| CN219511960U (en) | Chemical pump production is with pressing detection device | |
| CN106370410B (en) | A kind of liquid film generating device and its application method | |
| CN110553816B (en) | Fluctuating wall resistance testing device based on fish swimming posture | |
| CN203164018U (en) | Device for automatically sampling and distributing water sample | |
| CN110864872B (en) | Deformation wall surface mechanism capable of being used for resistance test | |
| CN110579332B (en) | Device for measuring fluid resistance of corrugated plate | |
| CN102677625B (en) | Device used in towing tank for simulating profile flows | |
| CN112572718B (en) | Bionic flexible fin hydrodynamic performance measurement experimental device and method | |
| CN213068135U (en) | Open channel hydraulics variable slope experimental apparatus with slidable side wall surface | |
| CN110282076B (en) | Experimental device for continuous collision of crushed ice and ocean structure in water tank | |
| CN201707321U (en) | Horizontal adjusting platform for holding ultrasonic detection elements | |
| CN111774027A (en) | A reation kettle for chemical production | |
| CN220831193U (en) | Movable drip irrigation equipment of seedbed | |
| CN219200540U (en) | Ultrasonic flowmeter convenient to overhaul | |
| BRPI1102763A2 (en) | mechanical wave beater module on a water surface, powered by hydraulic pistons | |
| CN213378599U (en) | Track straightener | |
| CN220542921U (en) | Rock high slope deformation machine device based on numerical simulation | |
| CN116183878A (en) | Experimental device for be used for ocean oil spilling efflorescence rate survey | |
| CN220063131U (en) | River course fluviograph with automatic lifting function | |
| CN114086501A (en) | Basin water supply control and energy dissipater of controllable Buddha rude number |
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 | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |