CN112082471A - Formula wind generating set bolt on-line monitoring device is inhaled to magnetism - Google Patents
Formula wind generating set bolt on-line monitoring device is inhaled to magnetism Download PDFInfo
- Publication number
- CN112082471A CN112082471A CN202010970145.XA CN202010970145A CN112082471A CN 112082471 A CN112082471 A CN 112082471A CN 202010970145 A CN202010970145 A CN 202010970145A CN 112082471 A CN112082471 A CN 112082471A
- Authority
- CN
- China
- Prior art keywords
- adapter
- bolt
- upper cover
- monitoring device
- generating set
- 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.)
- Pending
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/30—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring angles or tapers; for testing the alignment of axes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D17/00—Monitoring or testing of wind motors, e.g. diagnostics
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
Abstract
The invention discloses a magnetic type on-line monitoring device for a bolt of a wind generating set, relates to the field of bolt state monitoring, and solves the problems of complex structure and difficulty in disassembly and assembly in the prior art. The device comprises an upper cover, an adapter and an angle sensor; wherein the upper cover is connected with the adapter; the adapter is connected with the angle sensor; the angle sensor comprises a potentiometer and a strong magnetic chuck; the strong magnetic sucker is fixedly connected with a rotating shaft of the potentiometer. The invention adopts a magnetic type installation mode, can realize high-precision measurement of relative rotation angles of the bolt and the nut, has simple structure and is easy to disassemble and assemble.
Description
Technical Field
The invention relates to the field of bolt state monitoring, in particular to a magnetic type wind generating set bolt online monitoring device.
Background
Bolts are the most common fasteners, and the quality of the bolted connection has an important influence on the state and life of the mechanical structure. The wind driven generator belongs to a large-scale structure, and tower barrels and blades at all levels are connected by a plurality of high-strength bolts. The wind driven generator has complex operation condition, and the bolt is easily loosened under the action of complex external forces such as alternating load and the like for a long time. When the bolt is loosened seriously, the bolt can be broken, and further serious accidents such as tower falling and the like are caused. Wind generating set generally is located more remote position, and traditional periodic inspection can't in time discover the bolt not hard up problem. Considering the complex working condition of the wind generating set and the requirement of regularly inspecting and compensating the moment, the bolt looseness online monitoring of the wind generating set needs to meet the functions of remote monitoring, early warning, electromagnetic interference resistance, convenience in disassembly and assembly and the like.
An existing device for monitoring bolt loosening, such as chinese invention patent CN108680191A, includes an inverted outer cylinder and an inner cylinder, the inner cylinder is disposed in the outer cylinder, rotation angle sensors are disposed at the centers of the tops of the outer cylinder and the inner cylinder, the outer cylinder is disposed at a connection end of a bolt to be monitored, a connection end of a first screw and a nut is disposed in the outer cylinder, the bottom of the outer cylinder is fixedly attached to the upper portion of a connection member, the inner cylinder is fixedly attached to the upper end of the nut, a shaft rod is vertically disposed at the top of the first screw, the upper end of the shaft rod is fixed to the outer cylinder, the rotation angle sensor is connected to an analog input acquisition module, and the analog input acquisition module is connected to a computer. The bolt looseness monitoring device has the advantages of simple structure, stable performance, strong reliability and convenience in installation, can monitor the bolt looseness in real time, and achieves the expected effect on the bolt looseness monitoring.
The device has the following defects: the device adopts the design of an inner cylinder and an outer cylinder, uses 2 rotation angle sensors, and has a more complex structure and higher cost; in addition, the inner cylinder of the device is fixed with the upper end of the screw cap in an attaching mode, so that the device is inconvenient to disassemble and assemble and is not suitable for occasions such as wind turbines and the like which need to be disassembled and assembled regularly.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and designs an online monitoring device for a bolt of a magnetic type wind generating set. The device comprises upper cover, adapter, angle sensor, simple structure is suitable for multiple model bolt, and its inside adopts one to have the angle sensor of high accuracy plastics potentiometre and strong magnetic chuck, and the plastics potentiometre can not receive strong magnetism influence, not only makes things convenient for the dismouting but also does not influence measurement accuracy, can satisfy the needs of wind turbine generator system bolt state monitoring. The technical effects that can be produced by the preferred technical scheme in the technical schemes provided by the invention are described in detail in the following.
For realizing above-mentioned purpose, magnetism is inhaled formula wind generating set bolt on-line monitoring device and is included: an upper cover, an adapter and an angle sensor;
wherein the upper cover is connected with the adapter;
the adapter is connected with the angle sensor;
the angle sensor comprises a potentiometer and a strong magnetic chuck;
the potentiometer shell is connected with the adapter;
the strong magnetic sucker is fixedly connected with the potentiometer rotating shaft.
Preferably, the lamp further comprises a control circuit board and an annular indicator light, wherein the control circuit board is installed in the upper cover, and the annular indicator light is embedded in the annular installation groove of the upper cover.
Preferably, the upper cover is a cylindrical shell, the end face of the upper cover is provided with a mounting hole, the connection with the control circuit board and the adapter is realized, the end face of the upper cover is provided with an annular mounting groove, the nested connection with the annular indicator lamp is realized, and the side face of the upper cover is provided with a heat dissipation groove, so that the heat dissipation of the circuit board is realized.
Preferably, the adapter is a cylindrical shell, and the inner ring of the adapter is matched with the outer dimension of the nut, so that the adapter and the nut can synchronously rotate. Furthermore, the side wall of the adapter is provided with a hollow groove, so that the contact area with the nut is reduced, and the axial friction resistance is reduced; the end face of the adapter is provided with a mounting hole for realizing connection with the angle sensor.
Preferably, the angle sensor includes: plastic potentiometer and strong magnetic chuck. Further, strong magnetic chuck with plastics potentiometre pivot fixed connection realizes strong magnetic chuck with plastics potentiometre pivot is synchronous to be rotated, during the use strong magnetic chuck closely adsorbs on the screw rod, realizes rotating with the screw rod in step.
Preferably, the control circuit board is installed in the upper cover, and the high-precision measurement, threshold judgment, remote communication and local indicator lamp control of the potential of the angle sensor are realized by adopting the control of a single chip microcomputer.
Preferably, the annular indicator light is arranged in the annular mounting groove of the upper cover, has a 3-color display function and is controlled by the control circuit board to realize color lamp indication in different states.
The invention has the beneficial effects that:
(1) the structure is simple, and the cost is low;
(2) the relative rotation angle of the nut and the screw is measured by adopting the plastic potentiometer, so that the precision is high, and the electromagnetic interference is resisted.
(3) And a strong magnetic sucker is adopted, so that the device is closely synchronous with the screw rod during measurement, and is easy to disassemble and assemble.
(4) The single chip microcomputer is adopted for control, functions such as high-precision angle measurement, threshold judgment, remote communication, local indicator light alarm and the like are achieved, and expansion and networking measurement are facilitated.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic plane structure diagram of a bolt online monitoring device of a magnetic type wind generating set according to one embodiment of the invention;
FIG. 2 is a schematic diagram of components of an online bolt monitoring device for a magnetic type wind generating set according to one embodiment of the invention;
FIG. 3 is a schematic view of an upper cover of the bolt online monitoring device of the magnetic type wind generating set according to one embodiment of the invention;
FIG. 4 is a schematic diagram of an adapter of the bolt online monitoring device of the magnetic type wind generating set according to one embodiment of the invention;
FIG. 5 is a schematic view of an angle sensor of the bolt online monitoring device of the magnetic type wind generating set according to one embodiment of the invention;
FIG. 6 is a schematic diagram of a magnetic type wind generating set bolt online monitoring device installed on a bolt according to an embodiment of the invention.
The reference numbers:
1-upper cover, 2-adapter, 3-angle sensor, 4-control circuit board, 5-annular indicator light, 6-radiating groove, 7-annular indicator light mounting groove, 8-upper cover end face, 9-empty groove, 10-adapter end face, 11-adapter inner ring, 12-plastic potentiometer, 13-strong magnetic chuck, 14-plastic potentiometer rotating shaft, 15-plastic potentiometer shell, 16-bolt online monitoring device, 17-nut, 18-screw.
Detailed Description
To make the objects, solutions and advantages of the present invention clearer, embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
The bolt online monitoring device for the magnetic type wind generating set according to the embodiment of the invention is described below with reference to the accompanying drawings.
Fig. 1 and 2 are schematic structural diagrams of a magnetic type wind generating set bolt online monitoring device according to one embodiment of the invention.
As shown in fig. 1, the online monitoring device for the bolt of the magnetic wind generating set according to one embodiment of the invention comprises: the upper cover 1, the adapter 2, the angle sensor 3, the control circuit board 4 and the annular indicator lamp 5 are all five parts.
Referring to fig. 3, the upper cover 1 is a cylindrical housing, and includes a heat sink 6, an annular indicator mounting groove 7, and an upper cover end surface 8. Wherein, radiating groove 6 realizes circuit element's ventilation cooling, and annular pilot lamp mounting groove 7 realizes that annular pilot lamp 5's embedding is connected, and control circuit board 4 installs and connects in upper cover 1 and covers terminal surface 8, and upper cover terminal surface 8 has the counter sink, realizes being connected with adapter 2 through the screw.
Referring to fig. 4, 2 and 6, the adapter 2 is a cylindrical housing, and includes a hollow groove 9, an adapter end surface 10 and an adapter inner ring 11. Wherein, adapter inner circle 11 is the hexagon, realizes the adaptation installation with the hexagon nut, and 2 lateral walls of adapter are opened there is dead slot 9, when realizing reducing weight, reduce the frictional resistance with the nut, and adapter terminal surface 10 has the mounting hole, realization and angle sensor 3's fixed connection.
In some embodiments, the shape and size of the adapter inner ring 11 can be adaptively designed according to the shape and size of the nut, so that the adapter inner ring can be adaptively installed with nuts of different specifications.
As shown in fig. 5, the angle sensor 3 includes: a plastic potentiometer 12 and a strong magnetic chuck 13. Wherein, the strong magnetic chuck 13 is fixedly connected with the rotating shaft 14 of the plastic potentiometer, and the shell 15 of the plastic potentiometer is fixedly connected with the adapter 2.
Referring to fig. 6, the magnetic type online monitoring device for bolt loosening of the wind generating set according to one embodiment of the invention is connected to the screw rod through the strong magnetic chuck 13, and the adapter 2 is sleeved with the nut through the adapter inner ring 11, so that the measurement of the relative rotation angle of the screw rod and the nut is realized, and the device is easy to disassemble and assemble.
As an example, the working principle of the present embodiment is as follows:
(1) if the strong magnetic chuck 13 of the present embodiment is attached to the screw 18 and the adaptor 2 is sleeved on the nut 17, the operation principle of the present embodiment is described as follows, as shown in fig. 2 and 6:
when the nut 17 and the screw 18 rotate relatively, the strong magnetic chuck 13 adsorbed on the screw 18 and the screw move synchronously to drive the plastic potentiometer rotating shaft 13 and the screw 18 to rotate synchronously, the adapter 2 is sleeved on the nut 17 and rotates synchronously with the nut 17, meanwhile, the plastic potentiometer shell 15 is fixedly connected with the adapter 2 to realize the synchronous rotation of the plastic potentiometer shell 15 and the nut 17, and then the relative rotation angle of the nut 17 and the screw 18 is converted into the resistance change of the plastic potentiometer 12. The control circuit board 3 provides voltage, changes of the resistance of the plastic potentiometer 12 are converted into voltage signals to be transmitted to the single chip microcomputer on the control circuit board, the single chip microcomputer on the control circuit board processes the collected voltage signals, the annular indicating lamp 5 is controlled to display different colors according to an internally set threshold value, meanwhile, the serial port and the Ethernet interface of the control circuit board can be remotely connected with a computer, and bolt state information is transmitted.
When the online monitoring device for the bolt looseness of the magnetic type wind generating set needs to be detached, the online monitoring device can be pulled out manually, and the online monitoring device is convenient and fast.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (8)
1. The utility model provides a not hard up on-line monitoring device of formula wind generating set bolt is inhaled to magnetism, mainly includes: upper cover (1), adapter (2), angle sensor (3), its characterized in that: upper cover (1) be connected with adapter (2), adapter (2) with angle sensor (3) are connected, angle sensor (3) include potentiometre (12), strong magnetic chuck (13) with pivot (14) of potentiometre are connected.
2. The bolt online monitoring device for the magnetic type wind generating set according to claim 1, further comprising a control circuit board (4) and an annular indicator lamp (5), wherein the control circuit board (4) is installed in the upper cover (1), and the annular indicator lamp (5) is installed in an annular installation groove (7) of the upper cover in an embedded manner.
3. The online bolt monitoring device for the magnetic type wind generating set according to claim 1, characterized in that: the upper cover (1) is a cylindrical shell, a mounting hole is formed in an upper cover end face (8), connection with the control circuit board (4) and the adapter (2) is achieved, the upper cover end face (8) is provided with an annular mounting groove (7), nested connection with the annular indicator lamp (5) is achieved, a heat dissipation groove (6) is formed in the side face of the upper cover, and heat dissipation of circuit elements is achieved.
4. The online bolt monitoring device for the magnetic type wind generating set according to claim 1, characterized in that: inner circle (11) of adapter can adapt to the nut shape, realizes cup jointing with different nuts, and open on adapter (2) side has dead slot (9), realizes reducing the frictional resistance of adapter and nut.
5. The online bolt monitoring device for the magnetic type wind generating set according to claim 1, characterized in that: the potentiometer (12) is a plastic potentiometer and is not interfered by the strong magnetic sucker (13).
6. The bolt online monitoring device for the magnetic type wind generating set according to claim 2, characterized in that the control circuit board (4) is controlled by a single chip microcomputer to realize measurement of a rotation angle of the angle sensor (3), threshold value alarming, remote communication and control of the annular indicator lamp (5).
7. The online bolt monitoring device for the magnetic type wind generating set according to claim 2, characterized in that: annular pilot lamp (5) install in upper cover annular mounting groove (7), control by control circuit board (4), show different colours.
8. The on-line monitoring device for the bolt of the magnetic type wind generating set, which adopts the device according to claim 1, is characterized in that: the device adopts strong magnetic chuck (13) to adsorb on the screw rod, adopts adapter (2) and nut to cup joint, realizes the measurement of the relative corner of nut and screw rod.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010970145.XA CN112082471A (en) | 2020-09-16 | 2020-09-16 | Formula wind generating set bolt on-line monitoring device is inhaled to magnetism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010970145.XA CN112082471A (en) | 2020-09-16 | 2020-09-16 | Formula wind generating set bolt on-line monitoring device is inhaled to magnetism |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112082471A true CN112082471A (en) | 2020-12-15 |
Family
ID=73736810
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010970145.XA Pending CN112082471A (en) | 2020-09-16 | 2020-09-16 | Formula wind generating set bolt on-line monitoring device is inhaled to magnetism |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112082471A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114582104A (en) * | 2022-03-03 | 2022-06-03 | 国网山东省电力公司电力科学研究院 | Power transmission tower bolt looseness early warning device |
| CN115325929A (en) * | 2022-07-20 | 2022-11-11 | 山东大学 | Device and method for detecting fastener loosening based on magnetic field change and robot |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2092951A2 (en) * | 1992-12-21 | 1996-12-01 | Daimler Benz Ag | Process and a device for the rotation-angle-monitored tightening or loosening of screw connections |
| CN201885684U (en) * | 2010-11-29 | 2011-06-29 | 宜昌三思科技有限公司 | Angular transducer |
| CN204831169U (en) * | 2015-02-25 | 2015-12-02 | 云南酷联科技有限公司 | Bolt looseness on -line monitoring device |
| WO2017045666A1 (en) * | 2015-09-15 | 2017-03-23 | Manfred Holtkamp Elektronik Gmbh | Device and method for monitoring loosenable bolt-nut connections |
| CN108548516A (en) * | 2018-06-28 | 2018-09-18 | 国电联合动力技术有限公司 | A kind of high-strength bolt loosens intelligent monitoring device, method and its generating set |
| CN108680191A (en) * | 2018-06-27 | 2018-10-19 | 南昌大学 | A kind of device that bolt looseness is monitored |
| CN109029954A (en) * | 2018-08-08 | 2018-12-18 | 深圳市永奥图电子有限公司 | A kind of loosened screw warning device and system |
| CN110231158A (en) * | 2019-07-05 | 2019-09-13 | 江苏轶一电力科技有限公司 | A kind of steel tower bolt looseness monitoring device |
| CN110273909A (en) * | 2019-06-05 | 2019-09-24 | 上海应谱科技有限公司 | A kind of intelligent fastener and on-line monitoring system that can perceive fastener nut loosening |
| CN110285955A (en) * | 2019-07-19 | 2019-09-27 | 贵州北盘江电力股份有限公司董箐分公司 | Top cover of hydraulic turbine set bolt and nut loosens detection device and method |
| CN110836684A (en) * | 2018-08-16 | 2020-02-25 | 中国电力科学研究院有限公司 | Bolt intelligence locking monitoring devices |
-
2020
- 2020-09-16 CN CN202010970145.XA patent/CN112082471A/en active Pending
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2092951A2 (en) * | 1992-12-21 | 1996-12-01 | Daimler Benz Ag | Process and a device for the rotation-angle-monitored tightening or loosening of screw connections |
| CN201885684U (en) * | 2010-11-29 | 2011-06-29 | 宜昌三思科技有限公司 | Angular transducer |
| CN204831169U (en) * | 2015-02-25 | 2015-12-02 | 云南酷联科技有限公司 | Bolt looseness on -line monitoring device |
| WO2017045666A1 (en) * | 2015-09-15 | 2017-03-23 | Manfred Holtkamp Elektronik Gmbh | Device and method for monitoring loosenable bolt-nut connections |
| CN108680191A (en) * | 2018-06-27 | 2018-10-19 | 南昌大学 | A kind of device that bolt looseness is monitored |
| CN108548516A (en) * | 2018-06-28 | 2018-09-18 | 国电联合动力技术有限公司 | A kind of high-strength bolt loosens intelligent monitoring device, method and its generating set |
| CN109029954A (en) * | 2018-08-08 | 2018-12-18 | 深圳市永奥图电子有限公司 | A kind of loosened screw warning device and system |
| CN110836684A (en) * | 2018-08-16 | 2020-02-25 | 中国电力科学研究院有限公司 | Bolt intelligence locking monitoring devices |
| CN110273909A (en) * | 2019-06-05 | 2019-09-24 | 上海应谱科技有限公司 | A kind of intelligent fastener and on-line monitoring system that can perceive fastener nut loosening |
| CN110231158A (en) * | 2019-07-05 | 2019-09-13 | 江苏轶一电力科技有限公司 | A kind of steel tower bolt looseness monitoring device |
| CN110285955A (en) * | 2019-07-19 | 2019-09-27 | 贵州北盘江电力股份有限公司董箐分公司 | Top cover of hydraulic turbine set bolt and nut loosens detection device and method |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114582104A (en) * | 2022-03-03 | 2022-06-03 | 国网山东省电力公司电力科学研究院 | Power transmission tower bolt looseness early warning device |
| CN115325929A (en) * | 2022-07-20 | 2022-11-11 | 山东大学 | Device and method for detecting fastener loosening based on magnetic field change and robot |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112082471A (en) | Formula wind generating set bolt on-line monitoring device is inhaled to magnetism | |
| CN108680191B (en) | Device for monitoring loosening of bolt | |
| CN110285955B (en) | Device and method for detecting loosening of bolts and nuts of top cover of water turbine unit | |
| CN201233278Y (en) | Overrun indicator for heat-sensitive ferrite temperature | |
| CN206095479U (en) | Shaft type torque sensor | |
| CN107313765B (en) | Rotary encoder installing support that can flexibly deflect | |
| CN112945424B (en) | Vibrating wire type surface strain gauge and using method thereof | |
| CN210243155U (en) | Hydraulic turbine top cap bolt nut looseness detects sensor | |
| CN113399992A (en) | Novel six auto-screwdriving machines of robotic arm | |
| CN212904967U (en) | Differential pressure type wind speed sensor | |
| CN218297089U (en) | Three-dimensional displacement detection device | |
| CN220234398U (en) | Replaceable motor | |
| CN211903995U (en) | Airplane brake torque cylinder appearance detection device | |
| CN105466490B (en) | A kind of lightweight wind direction and wind velocity sensor | |
| CN221427201U (en) | Forest fire prevention video monitoring device round clock | |
| CN215582060U (en) | Intelligent remote transmission device | |
| CN219714402U (en) | Outdoor temperature and humidity display device | |
| CN214470954U (en) | Sensor for controlling stability | |
| CN220960131U (en) | Environment monitoring equipment based on NB-IoT | |
| CN201600240U (en) | Cylinder spring tester | |
| CN217849132U (en) | Flywheel energy storage device | |
| CN215554014U (en) | Rudder angle indicator for collecting corner signals by using magnetic sensor | |
| CN218671387U (en) | Monitor device | |
| CN216387432U (en) | Rainfall telemetering terminal convenient to fixed use | |
| CN219416281U (en) | Non-magnetic large-caliber water meter based on infrared light sampling |
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 | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20201215 |
|
| WD01 | Invention patent application deemed withdrawn after publication |