CN102445192B - Communicating tube member inclination sensor - Google Patents
Communicating tube member inclination sensor Download PDFInfo
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- CN102445192B CN102445192B CN 201110293455 CN201110293455A CN102445192B CN 102445192 B CN102445192 B CN 102445192B CN 201110293455 CN201110293455 CN 201110293455 CN 201110293455 A CN201110293455 A CN 201110293455A CN 102445192 B CN102445192 B CN 102445192B
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Abstract
The invention discloses a communicating tube member inclination sensor, which comprises a communicating tube, a water pressure sensor, a water temperature sensor, a pressure measuring tube, a liquid surface fluctuation damper, an anti-evaporation cover and the like. In the sensor, an electric sensing signal of the inclination of a member is output by using the water pressure sensor according to the liquid surface difference of the communicating tube buried or arranged in the member. The communicating tube member inclination sensor has the advantages of high accuracy, large measuring range, high resolution, low manufacturing cost, easiness and convenience for installing and capability of displaying data in real time.
Description
Technical field
The present invention relates to a kind of sensor of measuring member angle of inclination or the discrepancy in elevation, specifically a kind of communicating pipe member inclination sensor.
Background technology
At present, the inclination sensors such as existing mechanical type, photo-electric can only be tested the angle of inclination of a certain measuring point of tested member, for tested member integrated at the test surfaces angle of inclination or the measurement of the edge discrepancy in elevation all inapplicable.
Summary of the invention
The present invention is directed to the deficiency of existing inclination sensor, a kind of communicating pipe inclination sensor is proposed, two mouths of pipe of U-shaped communicating pipe are placed in respectively the edge of tested member, piezometric tube is installed on the mouth of pipe, poor by the liquid level that water pressure sensor measures in piezometric tube, sensing gets tested member in angle of inclination or the discrepancy in elevation of test surfaces, and with the computer interconnection deal with data, satisfy the needs of automatically controlling.
Technical solution problem of the present invention adopts following technical scheme:
A kind of communicating pipe member inclination sensor, it is characterized in that: pre-buried or settle 1 U-shaped communicating pipe in the test surfaces of tested member, the mouth of pipe at this pipe two ends is positioned at tested member edge in a distance, and two mouths of pipe all up and concordant with tested member end face.The mouth of pipe of communicating pipe from bottom to top is mounted with draining valve, water pressure sensor, piezometric tube, vent connector and vaporproof closure successively, and another mouth of pipe from bottom to top is mounted with cooling-water temperature sensor, water pressure sensor, piezometric tube, vent connector and vaporproof closure successively.On two piezometric tube, the reading indentation is arranged all, and floating on the water surface in piezometric tube the liquid fluctuating damper arranged.
The communicating pipe member inclination sensor is characterized in that: described water pressure sensor casing is penetrating drum, and there is the spanner shoulder centre outside casing, on the casing of spanner shoulder one side, external thread is arranged.Casing has the end of external thread one side that protection net is arranged, wavy spring film, modulation panel, circuit board, base plate, cable fixing head are arranged from protection net in casing successively, wavy spring film and modulation panel arrange perpendicular to the water pressure sensor center line, and are the cavity that is communicated with atmosphere between it.There is the permanent-magnet steel piece at the center of wavy spring film, and there is Hall element at the modulation panel center, permanent-magnet steel piece and Hall element interval 5mm.The wavy spring film edge has sealing, and air hole is arranged on modulation panel.
The communicating pipe member inclination sensor is characterized in that: described liquid fluctuating damper is the ball shape, and the red indentation of circumference of 1 road level is arranged in the middle of disc, in the bottom of ball, counterweight block is arranged.
The communicating pipe member inclination sensor is characterized in that: the epimere of described vent connector is the cylindrical piece shape, and its hypomere is round tube shape, the concentricity line of this cylindrical piece and pipe, and the external diameter of cylindrical piece is larger than the external diameter of pipe.There is the bulb stopper pit at cylindrical piece end face center, and this pit centres has penetrating circular hole.The cylindrical piece end face has 8 equidistant penetrating circular holes along periphery, and the fixedly screw thread of vaporproof closure is arranged on the cylindrical piece lateral surface.
The communicating pipe member inclination sensor is characterized in that: the casing of described vaporproof closure is the dome shape, and there is penetrating circular hole at the end face center of casing, and there is screw thread the inboard of hypomere.The circular hole of casing end face is embedded with semicircular translucent cover, red and green color light emitting diode, dividing plate, electromagnet, fixed head, connecting rod and bulb stopper are from top to bottom arranged from translucent cover in casing successively, there are respectively self-locking circulating slide rail and microswitch in the both sides of connecting rod, and lock circulation slide rail and microswitch all are fixed on fixed head.Connecting rod is straight-bar, and the upper end is connected with electromagnet armature, and the lower end is connected with bulb stopper.The middle part of connecting rod is connected with crank end by bearing pin, and the other end of crank is connected with slide block on the self-locking circulating slide rail.The adhesive kinematic link of electromagnet armature is slided on the self-locking circulating slide rail by crank band movable slider, and bulb stopper is moved up and down by the slide rail track, forms the keying to the center roof vent of vent connector.Connecting rod moves when driving bulb stopper up and down, drives the switch of microswitch, makes bulb stopper be positioned at red and green color light emitting diode bright green when upper, and bulb stopper is positioned at red and green color light emitting diode shiny red when the next.The side of casing is mounted with socket.
In the present invention, the communicating pipe member inclination sensor is based on following principle of work:
The principle of work of member inclination sensing: pre-buried or communicating pipe of settling in tested component testing face, the mouth of pipe at this pipe two ends is positioned at tested member edge in a distance.Be mounted with separately water pressure sensor and piezometric tube on two mouths of pipe up.Be filled to the reading height of piezometric tube within communicating pipe, vaporproof closure is arranged at test mode, allow the liquid level of communicating pipes two mouth of pipe all bear atmospheric pressure.When tested member tilted, the variation of height occured in the water surface in piezometric tube.If communicating pipe, the horizontal range of two water delivering orifices was L, the piezometric surface discrepancy in elevation is h, and the angle of inclination of tested member on the test surfaces direction that converses is α=arctg (h/L).As L=10m, h=1mm, α=arctg (h/L)=arctg (1/10000)=0.01 °.The differentiation of member vergence direction: when the piezometric surface discrepancy in elevation be+during h, member is tilted to the left; When the piezometric surface discrepancy in elevation be-during h, member is tilted to the right.Water pressure sensor is arranged owing to being arranged on below piezometric tube, in piezometric tube, the variation of water level, make water pressure sensor bear pressure and also change, and just can allow the analog electrical signal of the tested member run-off the straight of water pressure sensor sensing output.
The principle of work of water pressure sensor: the front fuselage at water pressure sensor arranges the waveform elastic film, and the center of film is pasted with magnet steel, keeps on certain distance and parallel modulation panel, Hall element being set with this magnet steel face.Water pressure sensor is installed on the below of piezometric tube, the elastic membrane of this sensor is out of shape with the variation of the depth of water in piezometric tube, changing the distance between magnetic steel ingot and Hall element, the characteristic that when utilizing Hall element to accept strong or weak magnet steel magnetic field, output voltage can change reaches the purpose of water pressure sensing.In addition, allow being operated in the linear elasticity scope of waveform elastic film, and the Hall element of selecting linear properties, just can reach desirable measurement resolution and precision.
Beneficial effect of the present invention is embodied in:
Simple structure of the present invention, volume is little, range is large, precision is high, easy for installation, cost is low, can show in real time data, is applicable to the test of the building element angles of inclination such as dam, bridge or the discrepancy in elevation.
Description of drawings
Figure 1A is the front view of communicating pipe member inclination sensor of the present invention.
Figure 1B is the left view of communicating pipe member inclination sensor of the present invention.
Fig. 1 C is the vertical view of communicating pipe member inclination sensor of the present invention.
Fig. 2 A is the front view of water pressure sensor in the present invention.
Fig. 2 B is the side view of water pressure sensor in the present invention.
Fig. 2 C is the vertical view of water pressure sensor in the present invention.
Fig. 3 A is the front view of liquid fluctuating damper in the present invention.
Fig. 3 B is the left view of liquid fluctuating damper in the present invention.
Fig. 4 A is the front view of vent connector in the present invention.
Fig. 4 B is the vertical view of vent connector in the present invention.
Fig. 5 A is the front view of vaporproof closure in the present invention.
Fig. 5 B is the left view of vaporproof closure in the present invention.
Fig. 5 C is the vertical view of vaporproof closure in the present invention.
Number in the figure:
1 tested member, 2 water, 3 communicating pipes, 4 piezometric tube, 5 draining valves, 6 cooling-water temperature sensors; 11 water pressure sensors, 12 protection nets, 13 wavy spring films, 14 permanent-magnet blocks, 15 Hall elements, 16 modulation panels, 17 air holes, 18 circuit boards, 19 casings, 20 base plates, 21 cable fixing heads, 22 cables; 31 liquid fluctuating dampers, 32 circumference indentations, 33 counterweight blocks; 41 vent connectors, 42 cylindrical pieces, 43 pipes, 44 bulb stopper pits, 45 center roof vents; 51 vaporproof closures, 52 red and green color light emitting diodes, 53 electromagnet, 54 microswitches, 55 self-locking circulating slide rails, 56 connecting rods, 57 bulb stoppers, 58 translucent covers, 59 cranks, 60 fixed heads, 61 dividing plates, 62 casings, 63 sockets.
Embodiment
Referring to Figure 1A, Figure 1B and Fig. 1 C, pre-buried or settle 1 U-shaped communicating pipe 3 in the test surfaces of tested member 1 described in the present embodiment, the mouth of pipe at this pipe two ends is positioned at tested member 1 edge in a distance, and two mouths of pipe all up and concordant with tested member 1 end face.1 mouth of pipe of communicating pipe 3 from bottom to top is mounted with draining valve 5, water pressure sensor 11, piezometric tube 4, vent connector 41 and vaporproof closure 51 successively, and another 1 mouth of pipe from bottom to top is mounted with cooling-water temperature sensor 6, water pressure sensor 11, piezometric tube 4, vent connector 41 and vaporproof closure 51 successively.On two piezometric tube 4, the reading indentation is arranged all, and 2 upper floating liquid fluctuating dampers 31 that have of the interior water of piezometric tube 4.
Referring to Fig. 2 A, Fig. 2 B and Fig. 2 C, water pressure sensor 11 casings 19 described in the present embodiment are penetrating drum, and there is the spanner shoulder centre in casing 19 outsides, on the casing 19 of spanner shoulder one side, external thread is arranged.Casing 19 has the end of external thread one side that protection net 12 is arranged, wavy spring film 13, modulation panel 16, circuit board 18, base plate 20, cable fixing head 21 are arranged from protection net 12 in casing 19 successively, wavy spring film 13 perpendicular to water pressure sensor 11 center line settings, and is the cavity that is communicated with atmosphere between it with modulation panel 16.There is permanent-magnet steel piece 14 at the center of wavy spring film 13, and there is Hall element 15 at modulation panel 16 centers, permanent-magnet steel piece 14 and Hall element 15 interval 5mm.There is sealing at wavy spring film 13 edges, and air hole 17 is arranged on modulation panel 16.
Referring to Fig. 3 A and Fig. 3 B, the liquid fluctuating damper 31 described in the present embodiment is the ball shape, and the red indentation 32 of circumference of 1 road level is arranged in the middle of disc, and counterweight block 33 is arranged in the bottom of ball.
Referring to Fig. 4 A and Fig. 4 B, the epimere of vent connector described in the present embodiment 41 is cylindrical piece 42 shapes, and its hypomere is pipe 43 shapes, this cylindrical piece 42 and the concentricity line of pipe 43, and the external diameter of cylindrical piece 42 is larger than the external diameter of pipe 43.There is bulb stopper pit 44 at cylindrical piece 42 end face centers, and there is penetrating circular hole 45 at this pit 44 centers.Cylindrical piece 42 end faces have 8 equidistant penetrating circular holes along periphery, and the fixedly screw thread of vaporproof closure 51 is arranged on cylindrical piece 42 lateral surfaces.
Referring to Fig. 5 A and Fig. 5 B, the casing 62 of vaporproof closure described in the present embodiment 51 is the dome shape, and there is penetrating circular hole at the end face center of casing 62, and there is screw thread the inboard of hypomere.The circular hole of casing 62 end faces is embedded with semicircular translucent cover 58, red and green color light emitting diode 52, dividing plate 61, electromagnet 53, fixed head 60, connecting rod 56 and bulb stopper 57 are from top to bottom arranged from translucent cover 58 in casing 62 successively, there are respectively self-locking circulating slide rail 55 and microswitch 54 in the both sides of connecting rod 56, and lock circulation slide rail 55 all is fixed on fixed head 60 with microswitch 54.Connecting rod 56 is straight-bar, and the upper end is connected with the armature of electromagnet 53, and the lower end is connected with bulb stopper 57.The middle part of connecting rod 56 is connected with crank 59 ends by bearing pin, and the other end of crank 59 is connected with slide block on self-locking circulating slide rail 55.The adhesive kinematic link 56 of electromagnet 53 armature is slided on self-locking circulating slide rail 55 by crank 59 band movable sliders, and bulb stopper 57 is moved up and down by the slide rail track, forms the keying to the center roof vent 45 of vent connector 41.Connecting rod 56 moves when driving bulb stopper 57 up and down, drives the switch of microswitch 54, makes bulb stopper 57 be positioned at red and green color light emitting diode 52 bright greens when upper, and bulb stopper 57 is positioned at red and green color light emitting diode 52 shiny reds when the next.The side of casing 62 is mounted with socket 63.
The material of described piezometric tube 4 is clear glass, and the material of water 2 is the water that incorporates anticorrosion anti-biological derivative chemical agent, and the material of liquid fluctuating damper 31 is light plastic; The material of described wavy spring film 13 is the HDPE resin; The material of described modulation panel 16 is engineering plastics; The material of described bulb stopper 57 is light plastic.
Adopting water pressure sensor 11 all is set on two piezometric tube 4 is in order to back up, and adapts to different method of testings.
Allocation method when using the communicating pipe member inclination sensor is characterized in that carrying out according to the following procedure:
A. pre-buried in testee or settle U-shaped communicating pipe, and two mouths of pipe of this pipe are all up.
B. with water conservancy project devices such as straight-through, threeway, Shu Jie, draining valve, cooling-water temperature sensor, water pressure sensor, piezometric tube are connected, its seam crossing is all established sealing.
C. sieve from the piezometric tube of a side and inject the water of mixing antiseptic, until in piezometric tube, water is filled with.Two liquid fluctuating dampers are put into respectively two piezometric tube downwards with pouring weight, open the draining valve draining, after allowing liquid fluctuating damper reading indentation be positioned at the range of readings of piezometric tube, fasten draining valve.
D. two vaporproof closures are tightened against respectively the vent connector of piezometric tube upper end, and are arranged at test mode, be i.e. liquid level and atmospheric pressure UNICOM (non-testing time should be closed vaporproof closure, affects test to prevent evaporation of water in piezometric tube) in piezometric tube.
E. the cable of water pressure sensor, cooling-water temperature sensor and vaporproof closure is connected with member inclination processor, can carry out to testee the test of angle of inclination or the discrepancy in elevation.
The effect of water 2 is to form horizontal liquid level within communicating pipe; The effect of communicating pipe 3 is to allow the test point of tested member consist of the connection of water; The effect of piezometric tube 4 is to show liquid level, and places liquid fluctuating damper 31; The effect of draining valve 5 is to discharge the interior unnecessary water of piezometric tube 4, makes the read text scale of liquid fluctuating damper 31 be positioned at test specification; The effect of cooling-water temperature sensor 6 is temperature of test water, revises water temperature to the impact of liquid level in piezometric tube;
The effect of water pressure sensor 11 is height of liquid level in the sensing piezometric tube; The effect of protection net 12 is protection wavy spring films 13; The effect of wavy spring film 13 is when bearing water pressure, forms linear deformation, allows permanent magnet give the Hall element magnetic line of force; The effect of permanent-magnet block 14 is to give Hall element 15 magnetic lines of force; The effect of Hall element 15 is under permanent magnet 14 effects, the electric signal of sensing testing; The effect of modulation panel 16 is the operating distances of regulating Hall element 15 and permanent magnet 14; The effect of air hole 17 is to allow the both sides of wavy spring film 13 all act on relative atmospheric pressure; The effect of circuit board 18 is welding Hall element 15 and control circuit; The effect of casing 19 is protection and the components and parts such as fixed waveform spring diaphragm 13, modulation panel 16; The effect of base plate 20 is installing cables glands 21; The effect of cable fixing head 21 is attached cables 22; The effect of cable 22 is input power and output transducing signal; The effect of liquid fluctuating damper 31 is the fluctuations that reduce piezometric tube 4 interior liquid levels, and the reading of being convenient to this liquid level; The effect of circumference indentation 32 is the readings for piezometric tube 4 interior liquid levels; The effect of counterweight block 33 is to allow the circumference indentation of liquid fluctuating damper 31 32 keep horizontality; The effect of vent connector 41 is to allow piezometric tube 4 be connected with vaporproof closure 51, and air hole is set; The effect of cylindrical piece 42 is air hole, bulb stopper pit 44, center roof vent 45 to be set and the fixedly screw thread of vaporproof closure 51 is set; The effect of pipe 43 is to be connected and fixed with piezometric tube 4; The effect of bulb stopper pit 44 is to be convenient to bulb stopper 57 to open and close center roof vent 45; The effect of center roof vent 45 is to keep bearing atmospheric pressure for the interior liquid level of piezometric tube 4; The effect of vaporproof closure 51 is the evaporations that prevent piezometric tube 4 interior moisture, and the signal of duty is provided; The effect of red and green color light emitting diode 52 is to provide the signal of duty; The effect of electromagnet 53 is to provide power for opening and closing bulb stopper 57; The effect of microswitch 54 is to control red and green color diode 52 displays; The effect of self-locking circulating slide rail 55 is to allow the adhesive kinematic link 56 of electromagnet 53 armature, is slided on self-locking circulating slide rail 55 by crank 59 band movable sliders, and bulb stopper 57 is moved up and down, forms the keying to bulb stopper pit 44 center roof vents 45 of vent connector 41; The effect of connecting rod 56 is that electromagnet 53 is connected with bulb stopper 57; The effect of bulb stopper 57 is to open and close center roof vent 45; The effect of translucent cover 58 is protection red and green color light emitting diodes 52; The effect of crank 59 is to allow connecting rod 56 move up and down by the track of self-locking circulating slide rail 55; The effect of fixed head 60 is that electromagnet 53 components and parts such as grade are fixed in casing 62; The effect of dividing plate 61 is reflective and baffle plate; The effect of casing 62 is protections and settles components and parts; The effect of socket 63 is that sensor is connected with the wiring of member inclination processor.
The performance of communicating pipe member inclination sensor
1. range:
1) angle of inclination: 0～90 ° or-45 °～45 °;
2) water surface discrepancy in elevation: 0～100mm or-50mm～50mm.
2. resolution: 0.1 °.
3. precision: ± 0.3 °.
4. working temperature: 5～60 ℃.
Claims (1)
1. communicating pipe member inclination sensor, include tested member (1), it is characterized in that: pre-buried or settle 1 U-shaped communicating pipe (3) in the test surfaces of tested member (1), communicating pipe, the mouth of pipe at (3) two ends was positioned at tested member (1) edge, and two mouths of pipe all up and concordant with tested member (1) end face; The mouth of pipe of communicating pipe (3) from bottom to top is mounted with draining valve (5), water pressure sensor (11), piezometric tube (4), vent connector (41) and vaporproof closure (51) successively, and another mouth of pipe from bottom to top is mounted with cooling-water temperature sensor (6), water pressure sensor (11), piezometric tube (4), vent connector (41) and vaporproof closure (51) successively; On two piezometric tube (4), the reading indentation is arranged all, and floating on the interior water of piezometric tube (4) (2) face liquid fluctuating damper (31) arranged;
The casing (19) of described water pressure sensor (11) is penetrating drum, and there is the spanner shoulder centre outside casing (19), on the casing (19) of spanner shoulder one side, external thread is arranged; Casing (19) has the end of external thread one side that protection net (12) is arranged, wavy spring film (13), modulation panel (16), circuit board (18), base plate (20) and cable fixing head (21) are arranged from protection net (12) in casing (19) successively, wavy spring film (13) and modulation panel (16) be perpendicular to water pressure sensor (11) center line setting, and be the cavity that is communicated with atmosphere between wavy spring film (13) and modulation panel (16); There is permanent-magnet steel piece (14) at the center of wavy spring film (13), and there is Hall element (15) at modulation panel (16) center, permanent-magnet steel piece (14) and Hall element (15) interval 5mm; There is sealing at wavy spring film (13) edge, and air hole (17) is arranged on modulation panel (16);
Described liquid fluctuating damper (31) is the ball shape, and the red indentation (32) of circumference of 1 road level is arranged in the middle of disc, and counterweight block (33) is arranged in the bottom of ball;
The epimere of described vent connector (41) is cylindrical piece (42) shape, and its hypomere is pipe (43) shape, described cylindrical piece (42) and the concentricity line of pipe (43), and the external diameter of cylindrical piece (42) is larger than the external diameter of pipe (43); There is bulb stopper pit (44) at cylindrical piece (42) end face center, and there is penetrating circular hole (45) at this pit (44) center; Cylindrical piece (42) end face has 8 equidistant penetrating circular holes along periphery, and the fixedly screw thread of vaporproof closure (51) is arranged on cylindrical piece (42) lateral surface;
The casing (62) of described vaporproof closure (51) is the dome shape, and there is penetrating circular hole at the end face center of casing (62), and there is screw thread the inboard of hypomere; The circular hole of casing (62) end face is embedded with semicircular translucent cover (58), red and green color light emitting diode (52), dividing plate (61), electromagnet (53), fixed head (60), connecting rod (56) and bulb stopper (57) are from top to bottom arranged from translucent cover (58) in casing (62) successively, there are respectively self-locking circulating slide rail (55) and microswitch (54) in the both sides of connecting rod (56), and lock circulation slide rail (55) all is fixed on fixed head (60) with microswitch (54); Connecting rod (56) is straight-bar, and the upper end is connected with the armature of electromagnet (53), and the lower end is connected with bulb stopper (57); The middle part of connecting rod (56) is connected with crank (59) end by bearing pin, and the other end of crank (59) is connected with slide block on self-locking circulating slide rail (55); The adhesive kinematic link (56) of electromagnet (53) armature, slided on self-locking circulating slide rail (55) by crank (59) band movable slider, bulb stopper (57) is moved up and down by the slide rail track, form the keying to the center roof vent (45) of vent connector (41); Connecting rod (56) moves when driving bulb stopper (57) up and down, drive the switch of microswitch (54), make bulb stopper (57) be positioned at red and green color light emitting diode (52) bright green when upper, bulb stopper (57) is positioned at red and green color light emitting diode (52) shiny red when the next; The side of casing (62) is mounted with socket (63).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110293455 CN102445192B (en) | 2011-09-30 | 2011-09-30 | Communicating tube member inclination sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110293455 CN102445192B (en) | 2011-09-30 | 2011-09-30 | Communicating tube member inclination sensor |
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| CN102445192A CN102445192A (en) | 2012-05-09 |
| CN102445192B true CN102445192B (en) | 2013-06-12 |
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| CN 201110293455 Expired - Fee Related CN102445192B (en) | 2011-09-30 | 2011-09-30 | Communicating tube member inclination sensor |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102829761A (en) * | 2012-08-17 | 2012-12-19 | 广州市市政工程设计研究院 | Rapid measuring system of ground height difference |
| CN106595591B (en) * | 2016-12-02 | 2018-10-02 | 江西省莲花水轮机厂有限公司 | A kind of plateau levels calibration method |
| CN109946012B (en) * | 2019-04-03 | 2021-04-30 | 中铁二十一局集团第二工程有限公司 | Device and method for measuring water pressure in stratum soil body |
| CN112693576A (en) * | 2021-01-26 | 2021-04-23 | 广船国际有限公司 | Ship inclination test device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201007647Y (en) * | 2006-07-06 | 2008-01-16 | 朱志学 | Multi-point level instrument |
| CN202304812U (en) * | 2011-09-30 | 2012-07-04 | 合肥工业大学 | Tilting sensor of communicated-pipe-type construction member |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE202004000780U1 (en) * | 2004-01-19 | 2004-05-13 | Sola-Messwerkzeuge Gmbh | Dragonfly for a spirit level |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201007647Y (en) * | 2006-07-06 | 2008-01-16 | 朱志学 | Multi-point level instrument |
| CN202304812U (en) * | 2011-09-30 | 2012-07-04 | 合肥工业大学 | Tilting sensor of communicated-pipe-type construction member |
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