CN2328001Y - Floating self balancer for level measurement - Google Patents

Abstract

The utility model discloses a floater self balanced mechanism for liquid level measurement, which is composed of the machine parts of an active pulley, metal bands, a floater, positioning needle holes, a passive pulley, a counterweight component, etc., wherein, the two ends of the floater which floats on liquid level are connected with the metal bands which are provided with the positioning holes, the included angle of the metal bands and the liquid level is 90 DEG, and the metal bands are respectively sheathed on wheel drums of the active pulley and the passive pulley, which jointly forms an annular band system of a closed circuit; the whole annular band system of the closed circuit is a self-balanced system which meets dynamics balancing principle, positioning needle nails are arranged on the wheel drum of the active pulley, central distance which is expanded by arbitrary two positioning needle nails is the same with the central distance of arbitrarily corresponding positioning holes which are arranged on the metal bands, the passive pulley and the counterweight which is connected with the transverse shaft of the passive pulley are suspended in liquid, and the transverse shaft and the counterweight can be slid up and down in corresponding slide grooves of an orientating block and a support frame.

Description

A kind of level gauging float self-balancing mechanism

The utility model relates to a kind of surveying instrument, is specifically related to a kind of mechanical type float self-balancing mechanism that is used for the level gauging instrument.

In the fluid storage jar in fields such as oil, chemical industry, float mechanism, to the servo-actuated sensor-based system in the tested liquid level ascending, descending process, it can pass to the mete-wand device exactly with the liquid level change amount as surveying instrument, makes fluid level measuring instrument finish accurate measurement to the liquid level change amount.

At present, the float mechanism in the various fluid level measuring instruments of selling on the market as shown in Figure 1, mainly includes buoy, guiding steel wire, connection steel band, connects steel band angle sheave, information code band, information code tape guide wheel and balance weight etc.Because the assembly of entire mechanism is many, thereby the friction force that causes is relatively just big, makes the insufficient sensitivity height of its sensing liquid level change amount; In addition, the stressed balance that is difficult in the mechanism, and easily generation slip relatively of gear train make that also the accuracy of its sensing liquid level change amount is low relatively; Moreover structure and installation are comparatively complicated.

At above-mentioned situation, the purpose of this utility model just is to provide a kind of have high sensitivity, pin-point accuracy, stress balance in the system, float self-balancing mechanism simple in structure, easy for installation.

The purpose of this utility model is achieved through the following technical solutions.A kind of level gauging float self-balancing mechanism, by driving pulley, formed by travelling block, metal tape, float, balancing weight, positioning wire, adjustment assembly, stud with equally distributed pilot pin nail on the wheel hub of wherein said driving pulley, this driving pulley is fixed on the main shaft of the mete-wand device that is located at the liquid tank top by key; The angle of described metal tape and liquid level is 90 degree, and is enclosed within driving pulley respectively and by on the wheel hub of travelling block, is connected with float two ends on floating over liquid level, forms a closed circuit endless belt system jointly; Have equally distributed, shape on this metal tape and adapt to the pilot hole of described pilot pin nail, and the centre of expansion of any two pilot pins nail apart from metal tape on the centre distance of any two corresponding pilot holes equate; Described balancing weight is fixedly connected on by on the transverse axis of travelling block, one bearing support with chute is connected with the locating piece rigidity of a hollow, and by the transverse axis of travelling block and balancing weight can be in the respective slide slots of bearing support, the hollow position of directed piece slides up and down, by travelling block by metal tape with locating piece is spacing is suspended in the lower curtate liquid; Two positioning wires penetrate respectively in two holes of picking up the ears of float, are fixed on the directed piece to an end rigidity respectively, and the other end is adjusted assembly by two and is fixed on the cover plate of liquid abhiseca portion; The suffered supporting power of above-mentioned driving pulley equals metal tape gravity and adds and the gravity of metal tape associated fitting that the suffered buoyancy of above-mentioned float equals the float self gravitation adds that closed circuit endless belt is produced when motion friction force.

When the liquid level in the liquid tank produces displacement, because closed circuit endless belt system satisfies the system of self-equilibrating mechanics principle in the technique scheme, so its float will keep its equilibrium state on liquid level, just must be along with liquid level produces identical displacement, and this motion passed to metal tape, make with on pilot hole penetrate in the pilot pin nail of driving pulley wheel hub, thereby drive the driving pulley rotation, and the displacement that liquid level produces passed to the level gauging standard, to finish of the accurate measurement of level gauging instrument to the liquid level change amount.Because stress balance in the utility model mechanism, and the entire mechanism assembly is few, can not produce any slip, so prior art has high sensitivity, pin-point accuracy relatively, from test figure as can be known, MECHANISM PRECISION improves at least 5 times.Simultaneously, simple in structure, easy for installation.

Below in conjunction with drawings and the specific embodiments the utility model is further described in more detail.

Fig. 1 is the fluid level measuring instrument mechanical drive synoptic diagram of prior art;

Fig. 2 is a front elevation of the present utility model;

Fig. 3 is a side view of the present utility model.

See also Fig. 2, Fig. 3, front elevation of the present utility model and side view.The utility model by driving pulley 1, by travelling block 2, float 3, metal tape 4, balancing weight 5, positioning wire 8, adjust assembly 9 and form, stud with equally distributed pilot pin nail 101 on the wheel hub of wherein said driving pulley 1, this driving pulley 1 is fixed on the main shaft 111 of the mete-wand device 11 that is located at liquid tank 12 tops by key 10; Described metal tape 4 is 90 degree with the angle of liquid level, and is enclosed within driving pulley 1 respectively and by on the wheel hub of travelling block 2, is connected with float 3 two ends on floating over liquid level, forms a closed circuit endless belt system jointly; Have equally distributed pilot hole 401 on this metal tape 4, and the centre of expansion of above-mentioned any two pilot pins nail 101 apart from metal tape on the centre distance of any two corresponding pilot holes 401 equate; Describedly be fixed with a balancing weight 5 on the transverse axis 201 of travelling block 2, one bearing support 7 with chute is connected with locating piece 6 rigidity of a hollow, and by the transverse axis 201 of travelling block 2 and balancing weight 5 can be in the respective slide slots of bearing support 7, the hollow position of directed piece 6 slides up and down, by travelling block 2 by metal tape 4 and locating piece 6 spacing being suspended in the lower curtate liquid; Two positioning wires 8 penetrate respectively in two holes 301 of picking up the ears of float, are fixed on to an end rigidity respectively on the directed piece 6, and the other end is fixed on liquid by two adjustment assemblies 9 and irritates on the cover plate at 12 tops.

Above-mentioned closed circuit endless belt system, satisfy following mathematic(al) representation:

F=P+f……………(1)

T=W ……………(2)

(1) F is the suffered buoyancy of float 3 in the formula, and P is the self gravitation of float 3, the friction force that f is produced when being system motion; (2) T is the supporting power of driving pulley 1 in the formula, W be metal tape 4 and with the gravity of its associated part.Promptly, metal tape 4 and offset by the supporting power of driving pulley 1 with the gravity of metal tape 4 associated fittings, the friction force that the self gravitation of float 3 and closed circuit endless belt produced in when motion is offset by float 3 suffered buoyancy, and whole closed circuit endless belt system is a self-balancing system that satisfies the mechanical balance principle.

When the liquid level in the liquid tank 12 produces displacement, because native system is a self-balancing system, so its float 3 will keep its equilibrium state on liquid level, just must be along with liquid level produces identical displacement, and this motion passed to metal tape 4, make with on pilot hole 401 penetrate in the pilot pin nail 101 of driving pulley 1 wheel hub, thereby drive the driving pulley rotation, and the displacement that liquid level produces passed to level gauging standard 11, to finish of the accurate measurement of level gauging instrument to the liquid level change amount.

The design of driving pulley 1 according to the needs of system's range, precision, is determined the size and the machining precision of its effective radius.Requirement to metal tape 4 is that material antiseptic is good, and stressed and temperature fluctuation is out of shape little, will follow closely 101 with the pilot pin on driving pulley 1 wheel hub with the machining precision of size that goes up pilot hole 401 and pitch-row and be complementary.To the designing requirement of float be that anti-corrosive properties are good, intermediate hollow, symmetry, balance be good, the selection of its weight and physical dimension is calculated and practical experience is determined according to mathematic(al) representation (1).By metal tape 4 and locating piece 6 spacing being suspended in the lower curtate liquid, played gearing by travelling block 2.Balancing weight 5 is fixed on by on the transverse axis of travelling block 2, plays the tension metal tape.Can be slided up and down in the chute of bearing support assembly 7 by the transverse axis on the travelling block 2 201.Two positioning wires 8 penetrate in two holes 301 of picking up the ears of float 3, and an end is rigidly fixed on the directed piece 6 respectively, and the other end is adjusted assembly 9 by two and is fixed on the cover plate of irritating 12 top mouths, and the effect of positioning wire 8 is to float 3 spacing orientations.The effect of adjusting assembly 9 is stationary positioned steel wire 8 and regulates by the level of transverse axis on the travelling block 2 and liquid level.

Claims (1)

1, a kind of level gauging float self-balancing mechanism, by driving pulley, formed by travelling block, metal tape, float, balancing weight, positioning wire, adjustment assembly, it is characterized in that: stud with equally distributed pilot pin nail on the wheel hub of described driving pulley, this driving pulley is fixed on the main shaft of the mete-wand device that is located at the liquid tank top by key; The angle of described metal tape and liquid level is 90 degree, and is enclosed within driving pulley respectively and by on the wheel hub of travelling block, is connected with float two ends on floating over liquid level, forms a closed circuit endless belt system jointly; Have equally distributed, shape on this metal tape and adapt to the pilot hole of described pilot pin nail, and the centre of expansion of any two pilot pins nail apart from metal tape on the centre distance of any two corresponding pilot holes equate; Described balancing weight is fixedly connected on by on the transverse axis of travelling block.One bearing support with chute is connected with the locating piece rigidity of a hollow, and by the transverse axis of travelling block and balancing weight can be in the respective slide slots of bearing support, the hollow position of directed piece slides up and down, by travelling block by metal tape with locating piece is spacing is suspended in the lower curtate liquid; Two positioning wires penetrate respectively in two holes of picking up the ears of float, are fixed on the directed piece to an end rigidity respectively, and the other end is adjusted assembly by two and is fixed on the cover plate of liquid abhiseca portion; The suffered supporting power of above-mentioned driving pulley equals metal tape gravity and adds and the gravity of metal tape associated fitting that the suffered buoyancy of above-mentioned float equals the float self gravitation adds that closed circuit endless belt is produced when motion friction force.

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