CN1285507A - Linear weight signal value collecting method for loading sensor of tower crane - Google Patents

Abstract

THe method for collecting the linear weight signal value of tower crane weight sensor is characterized by that when said method is used, the acting force on the sensor spring and lifting weight retain linear relationship always, so the deformation quantity of sensor spring and lifting weight also retain linear relationship, i.e, the weight signal value obtained by weight sensor and lifting weight are formed into linear relationship, therefore the adoption of said method can accurately obtain weight so as to ensure safe operation of tower crane.

Description

Tower crane weight sensor linear weight signal value acquisition method

Weight sensor is the important component part of tower machine safety guard, and its effect is to gather weight signal for limiter of moment.The range signal that weight signal that limiter of moment is gathered weight sensor and amplitude sensor are gathered synthesizes torque signals, for topworks provides control signal, thereby guarantee that tower machine arm can both work in each amplitude section under nominal load, take place with the tumbling of effective prevention tower machine, disconnected arm, accident such as bow.

Existing weight sensor weight signal acquisition principle and coupling method are as shown in Figure 1.

In Fig. 1, weight sensor is made up of leading block [1] [2], power taking pulley [4], sensing spring [5] pull bar [6] and support [7].Hoisting wirerope [3] one ends and windlass link, and the other end is walked around leading block [1], power taking pulley [4], leading block [2] and linked with lifting beam after having reached hanging pulley, and making power taking pulley [4] both sides wire rope form an angle thus is 2 α.During work, the directed force F that hoisting weight G reaches sensing spring [5] by hoisting wirerope [3] is closed and is made spring produce compression deformation, and the size of this deflection is the weight signal value that weight sensor is gathered.Acting force on the sensing spring [5] is:

F _Close=GCOS _αWhen hoisting weight G changed, angle [alpha] also changed thereupon, so the suffered directed force F of sensing spring [5] _CloseAnd be nonlinear relationship between the hoisting weight G, thereby make between the compress variation of sensing spring [5] and the hoisting weight and also be nonlinear relationship, the result just causes force signal can not accurately reflect hoisting weight, causes the torque signals distortion, thereby has influenced the control accuracy of limiter of moment.

The objective of the invention is to by a kind of linear weight signal acquisition method, make weight signal value that weight sensor gathers be linear change, thereby guarantee the control accuracy of limiter of moment with the variation of hoisting weight.

Weight sensor weight signal of the present invention is adopted principle and coupling method such as Fig. 2, Fig. 3, shown in Figure 4.

Fig. 2 is one of weight signal acquisition principle of the present invention and coupling method.

Fig. 3 is two of weight signal acquisition principle of the present invention and a coupling method.

Fig. 4 is three of weight signal acquisition principle of the present invention and a coupling method.

1. leading blocks, 2. leading blocks, 3. hoisting wireropes, 4. power taking pulleys, 5. sensing springs, 6. pull bars, 7. supports, 8. steel wire backguys, 9. levers are 1. among the figure. and windlass is 2.. and limiter of moment is 3.. play hanging pulley

In Fig. 2, weight sensor is made up of leading block [1] [2], power taking pulley [4], sensing spring [5], pull bar [6] and support [7].Hoisting wirerope [3] is walked around power taking pulley [4] back both sides is parallel and spreads out of, and links with two leading blocks [1] [2], and the wire rope angle that makes power taking pulley [4] both sides is zero.During work, under the pulling force effect of hoisting wirerope, power taking pulley [4] only produces translation, can not change the angle of both sides wire rope, thereby make acting force and hoisting weight on the sensing spring [5] remain linear relationship, thereby the deflection of sensing spring [5] and also retention wire sexual intercourse of hoisting weight, weight signal value that promptly weight sensor obtained and hoisting weight big or small linear.

In Fig. 3, weight sensor is made up of sensing spring [1], pull bar [2], lever [3] and support [4], and the lever of weight sensor [3] links with the end of hoisting wirerope.By Tu Kede, the compress variation L of sensing spring [1] and the pass between the hoisting weight G are: $L=\frac{\mathrm{<figure-callout\; id="2"\; label="aG"\; filenames="9911821400051.png,9911821400052.png"\; state="\{\{state\}\}">aG</figure-callout>}}{2\mathrm{bK}}-L_o$ In the formula, K is a spring rate, L _oBe the spring pre compressed magnitude, a, b are lever arm length.Following formula shows that when adopting this coupling method, the weight signal value that weight sensor obtained and the size of hoisting weight are also linear.

In Fig. 4, weight sensor is made up of sensing spring [1], support [2] and pull bar [3], and the pull bar of weight sensor [3] end direct and hoisting wirerope links.Like this, during work, hoisting weight will reach sensing spring [5] linearly, thereby obtain the weight signal value linear with hoisting weight.

Advantage of the present invention is by guaranteeing the linear relationship between weight signal and the hoisting weight Obtain delicate signal and torque signals, thereby guarantee reliably worker of tower machine limiter of moment Do, guarantee tower machine operation safety.

Claims (4)

1, a kind of tower crane weight sensor linear weight signal value acquisition method, it is characterized in that: the weight signal value that weight sensor is gathered is linear change with the variation of hoisting weight.

2, acquisition method one, it is characterized in that: weight sensor is made up of leading block (1) (2), power taking pulley (4), sensing spring (5), pull bar (6) and support (7), hoisting wirerope (3) is walked around power taking pulley (4) back both sides is parallel and spreads out of, link with two leading blocks (1) (2), the wire rope angle that makes power taking pulley (4) both sides is zero.

3, acquisition method two, it is characterized in that: weight sensor is made up of sensing spring (5), pull bar (6), support (7) and lever (9), and the lever of weight sensor (9) links with the end of hoisting wirerope (3).

4, acquisition method three, it is characterized in that: weight sensor is made up of sensing spring (5), pull bar (6) and support (7), and the pull bar of weight sensor (6) end direct and hoisting wirerope (3) links.

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