CN1270169C - Method and device for determining weight of starting parcel for winch - Google Patents

Abstract

A method for determining weight of starting article for hoister, when the load passing a hoister (1), the rotate speed and input current or voltage of the motor (5) is measured during hoisting process, and the weight of starting article can be obtain by calculating with a computer based on physics philosophy and electric engineering philosophy. A device using the method includes a rotate speed sensor (2), an electric power signal sensor (3) and a computer (4), wherein, the induction coil of the rotate speed sensor is connected with the rotate shaft of the motor; the induction coil of the electric power signal sensor is connected with the input cable (6) of the motor. The invention can quickly and accurately calculate the weight of each article and the total weight of the whole batch of articles, and can greatly improve the move and unload efficiency, and will quickly cut off the power by the feedback of the computer after the article that exceeds the maximum load of the hoister is detected and stop the hoist, thereby effectively protect the safety of equipment and working environment.

Description

A kind of method and device thereof of measuring weight of starting parcel for winch

Technical field

The invention belongs to electronic measuring method and Instrument technology field.

Background technology

At present; windlass both domestic and external (windlass of indication of the present invention also comprises crane) all understands that in the acceptance of the bid of equipment nameplate how many tons the liter weight that opens of this equipment is; but the weight that all can not display device promoting goods; the goods that is promoted also must measure by platform scale; just can know its weight; existing windlass only is equipped with pressure transducer and ammeter; the effect of pressure transducer is that protection equipment does not damage equipment because of lifting capacity is excessive; but it is subjected to the machining precision of equipment; installation accuracy and environment; the factor affecting of temperature is bigger; influence its sensing accuracy, and ammeter can only represent to promote the height of thing.As windlass; it each time; every day or each cycle promote lade weight what are; statistics is got up cumbersome; and because windlass all has specified maximum load; in the time can't knowing lifting thing weight; carry if blindly open; also may cause motor to burn out; even cause structure-steel framing to be damaged; because windlass is widely used in water conservancy; water power; electric power; public security; the mine; port and pier; all trades and professions such as factory; the lifting dress that lot cargo all takes place every day is driven, and the efficient of its metering and safety load protection all are the problems of outbalance.

Summary of the invention

Purpose of the present invention provides a kind of by measuring motor speed and input current or the voltage of windlass in load process for the weak point that overcomes above-mentioned prior art existence just, calculates the method and apparatus that promotes goods weight by physics and electrotechnics principle.

The objective of the invention is to realize by following technical solution:

A kind of method of measuring weight of starting parcel for winch during by windlass load, is measured rotating speed and the input current or the voltage of motor in the lifter motion process, calculate the weight that obtains starting parcel through computer according to physics principle and electrotechnics principle.

A kind of device that is used for the method for described mensuration weight of starting parcel for winch, it includes speed probe, electric power signal sensor and computer, and wherein the induction coil of speed probe is connected with shaft of motor; The induction coil of electric power signal sensor is connected with the input cable of motor.

The induced signal line of speed probe and electric power signal sensor is connected with computer; But speed probe, electric power signal sensor and computer single unit system also can be separately set in computer outside the windlass on windlass.

The present invention calculates by obtaining motor speed, and therefore, speed probe can also be connected to arbitrary revolving part of windlass gear train, utilizes the rotating speed of measuring this revolving part, can obtain the rotating speed of motor according to ratio of gear.

Because the present invention has adopted the motor speed of measuring windlass and input current or voltage method to calculate the weight that promotes goods; the speed probe that is provided with records different demand parameters respectively with the electric power signal sensor; behind the input computer; apply mechanically calculating respectively according to physics and electrotechnical relative theory; just can directly obtain to promote the weight of goods; thereby make the long-time rapid immediately general assembly (TW) that calculates the weight of each part goods accurately and measure goods by the gross of elevator function that promotes goods in enormous quantities; can greatly improve to remove and unload efficient; and feed back rapidly by computer through measuring after for the goods that surpasses the windlass load and to cut off the electricity supply; make to promote to stop to carry out, protect the safety of equipment and working environment effectively.

Further set forth content of the present invention below in conjunction with Figure of description.

Description of drawings

Fig. 1 is apparatus of the present invention syndeton synoptic diagram.

Embodiment

As shown in the figure, the device that the inventive method adopted, be that speed probe 2 and electric power signal sensor 3 are directly connected on the motor of windlass 1, speed probe 2 present technology are very ripe, the different device instrument of measuring method is a lot of on market, as the optoelectronic induction instrument, electromagnetic induction instrument etc., the induction coil of speed probe 2 is enclosed within on the motor shaft end, motor reel whenever turns around induction once, then rotation speed n can obtain in the time period according to twice induction, the pulling speed V=nr/K of goods (r is the radius of circle of reel 8, and K is the gear train ratio of gear).And electric power signal inductor 3 is to utilize the principle of electromagnetic induction induction coil to be enclosed within on the input cable 6 of motor 5, produces magnetic field when electric current is flowed through lead, makes its induction measure input current I or input voltage U.The lifting force of windlass is f, because the ratio of gear K of the kinematic train 7 that is provided with on the windlass 1 is certain, and according to physics principle, the output power N of windlass ₁=fV; And according to the electrotechnics principle, the power input N of motor ₀=UI=RI ²U, I, R are respectively the resistance of motor input voltage, electric current and motor 5, R is definite value when motor is produced, all be marked with on the nameplate, according to the machinery scientific principle, windlass has the certain power loss in the transmission process of kinematic train 7 and hoisting drum 8, and motor 5 has the certain power loss, its windlass 1 total efficiency coefficient is η, then draws output power N according to the function conservation principle ₁=η N ₀

f·V＝η·RI ²； $f=\frac{\mathrm{\η}\·{\mathrm{RI}}^2}{V}$

Parameter η fixes on really can cross lifting standard test f before windlass is produced and measure I, V and can calculate η, and this parameter need only be measured I, V and promptly can be calculated the weight M that windlass must rise object by computer by computer memory in the reality.

Motor 5 all is set directly on windlass 1 structure-steel framing usually, speed probe 2 and electric power signal sensor 3 also directly are connected on the motor, and computer 4 both can also be connected motor structure-steel framing on one side, also can be arranged on observation ward by call wire, the software of one these computing method of cooperation is installed in computer 4, this software is very common usual, the people of the general software that coomputerates slightly just can design, during concrete operations, after induced signal imports computer 4 into, draw the weight that promotes thing M as calculated immediately, if goods is overweight, motor 5 power supplys are cut off in the computer immediate instruction, stop to promote operation.

Claims (3)

1, a kind of method of measuring weight of starting parcel for winch, it is characterized in that, during by windlass (1) load, in the lifter motion process, measure rotating speed and the input current or the voltage of motor (5), through computer according to physics function conservation principle: the power input N of motor ₀=UI=RI ², the output power N of windlass ₁=fV; Its windlass total efficiency coefficient is η, output power N ₁=η N ₀

It obtains the weight of starting parcel, and computing formula is:

f·V＝η·RI ²； $f=\frac{\mathrm{\η}\·{\mathrm{RI}}^2}{V}$

In the formula:

The pulling speed of V---thing, the lifting force of f---windlass, η---windlass total efficiency coefficient, U, I, R---be respectively input voltage, electric current and the resistance of motor.

2, a kind of device that is used for the method for mensuration weight of starting parcel for winch as claimed in claim 1, it is characterized in that, it includes speed probe (2), electric power signal sensor (3) and computer (4), and wherein the induction coil of speed probe (2) is connected with the rotating shaft of motor (5); The induction coil of electric power signal sensor (3) is connected with the input cable (6) of motor (5), and the induced signal line of speed probe (2) and electric power signal sensor (3) is connected with computer (4).

3, device according to claim 2 is characterized in that, speed probe (2), electric power signal sensor (3) with computer (4) but single unit system on windlass, also computer can be separately set in outside the windlass (1).

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