JPH107379A - Detecting device for number of wrapping turns of crane hook rope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent accident occurrence by detecting the number of wrapping turns of a crane hook rope automatically and eliminating inputting errors in an overload preventive device. SOLUTION: Sensors 25a to 25e for detecting the presence of a hook rope 16 wrapped around a plurality of head sheaves 12a to 12e which are provided at the top end of a boom 11, are provided for each head sheave. Sensors 26a, 26b for detecting the presence of rope sockets 18 are provided at both right end left sides of the top of the boom 11. Data of the position of the head sheave around which the hook rope 16 is wrapped and the position of the rope socket 18 are stored previously in a memory for each warp-around setting condition of hook rope, and the number of wrapping turns of the hook rope is determined with a controlling part by comparing detected results of the respective sensors with the date stored in the memory.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crane, and more particularly to a hook rope hooking number detecting device for judging the number of hook ropes that move a hook up and down on a sheave.

[0002]

2. Description of the Related Art Generally, a crane is equipped with an overload prevention device, which detects a tension of a boom elevating rope, a boom angle, etc., calculates a hanging load and a working radius, and issues an alarm when the load becomes large. To notify the danger and stop the operation of the actuator to ensure safety.

[0003] A method of calculating a suspension load in the overload prevention device will be described. FIG. 12 shows a crawler crane. If the hanging load applied to the hook is W _W , the boom weight is W _B , the tension of the hook rope is T ₁ , and the tension of the boom pendant is T ₂ , the left and right sides of the boom foot O are set. From the moment balance,

[0004]

(Equation 1)

[0005] The suspension load W applied to the hook by the following equation (2)
Calculate _W and manage so that the lifting load does not exceed the reference value. For each variable, depending on the initial mechanical specifications of the crawler crane, based on the detection value, such as tension sensors of the boom angle sensor and a boom derricking rope, the distance R _W from Bumufuto O to the acting point of each moment, R _B, H _W , H
Tension T _B of the _B and the boom derricking rope is automatically input to the overload prevention device.

The number N _{1 of} hook ropes and the number N ₂ of boom elevating ropes may be changed depending on the work content, and each time the operator manually inputs them to the overload prevention device.

[0007]

In overload preventing device in to the invention Problem to be Solved] Conventional cranes, for manually inputting the multiplied number N ₂ of multiplied number N ₁ and the boom derricking rope hook rope, actual the input operator error A number different from the number of hooks may be entered. Here, if the multiplying number N ₁ of the hook rope is input to the actual number greater than multiplied number, as can be seen from (2 expression), suspension load W _W applied to the hook is calculated actually smaller than.

Accordingly, even when it reaches the actual dangerous load suspension load, since suspension load W _W computed is not reached the dangerous load warning against overload is delayed, there is a possibility that an accident Was.

Therefore, there is a technical problem to be solved in order to automatically detect the number of hook ropes of the crane and to eliminate an input error in the overload prevention device to prevent occurrence of an accident. Therefore, an object of the present invention is to solve this problem.

[0010]

SUMMARY OF THE INVENTION The present invention has been proposed to achieve the above-mentioned object. A plurality of head sheaves are coaxially arranged at the tip of a boom, and a plurality of hook sheaves are coaxially arranged at a hook. The hook rope pulled out from the winch drum is sequentially wound around the head sheave and the hook sheave, and a rope socket is fixed to the end of the hook rope and fixed to the boom or the hook. The crane that moves the boom up and down is equipped with a sensor that detects the presence or absence of a rope socket fixed to the left side of the boom tip, and a sensor that detects the presence or absence of a rope socket fixed to the right side of the boom tip. A sensor to detect the presence or absence of the hook rope wrapped around each head sheave The data of the position of the head sheave and the position of the rope socket where the hook rope is wrapped is stored in the memory in advance for each setting state of the hook rope wrapping, and the detection result of each sensor and the data are stored in the memory. And a controller for determining the number of hook ropes hooked on the sheave by the control unit.

[0011]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows a crawler crane in which a plurality of head sheaves 12 are coaxially arranged at the tip of a boom 11 and a plurality of hook sheaves 14 are arranged side by side with a hook 13. The hook rope 16 drawn out from the winch drum 15 is sequentially wound between the head sheave 12 and the hook sheave 14 via the guide sheave 17. Further, the rope socket 18 is fixed to the tip of the hook rope 16, and the rope socket 18 is fixed to the tip of the boom 11 or the upper part of the hook 13.

Further, one end of a boom pendant 19 is locked at the rear end of the boom 11, a bridle 20 is connected to the other end of the boom pendant 19, and a bail 22 is provided at an upper end of the high mast 21. Then, the boom elevating rope 24 extended from the winch drum 23 is sequentially wound between the sheave of the bail 22 and the sheave of the bridle 20, and the tip of the rope is fixed.

FIG. 2 shows the tip of the boom 11. In this embodiment, a small crawler crane has five head sheaves 12 coaxially pivoted. The hook rope 16 passing through the guide sheave 17 is sequentially wound between the head sheave 12 and the hook sheave 14 in a predetermined order according to the initial mechanical specification, and the rope socket 18 at the tip of the hook rope 16 is The boom 11 is fixed to the left end or right end of the boom 11 or the upper part of the hook 13 according to the set number of hooks.

As shown in FIG. 1, a sensor 25 for detecting the presence or absence of the hook rope 16 wrapped around the head sheave 12 is provided for each head sheave 12, and it is determined which head sheave the hook rope 16 is wrapped around. To detect. Further, a sensor 26a for detecting the presence or absence of the rope socket 18 fixed to the left end of the boom 11 and a sensor 26b for detecting the presence or absence of the rope socket 18 fixed to the right end of the boom 11 are provided.

FIGS. 3 to 10 show a state where the hook rope 16 is wound around the head sheave 12 and the hook sheave 14, and in this embodiment, five head sheaves 1 are provided.
2a to 12e and five hook sheaves 14a to 14e, so that the sensors 25a to 25h detect the presence or absence of the hook rope 16 for each head sheave 12a to 12e.
25e is installed.

FIG. 3 shows that the hook rope 16 via the guide sheave 17 has five head sheaves 12a to 12e and 5
10 shows a state in which all the hook sheaves 14a to 14e are wound around ten hook sheaves 14a to 14e.
a to 25e each detect the presence of the hook rope 16 and output an ON signal. Further, since the rope socket 18 is fixed to the left end of the boom 11, the sensor 26a detects the presence of the rope socket 18 and outputs an ON signal, and the sensor 26b is turned OFF.

Next, FIG. 4 shows that the hook rope 16 via the guide sheave 17 is connected to the five head sheaves 12a to 12a.
e and four hook sheaves 14a, 14b, 14d, 14
e shows a state of 9 pieces hung around e.
Each of the sensors 25a to 25e detects the presence of the hook rope 16 and outputs an ON signal. However, since the rope socket 18 is fixed above the hook 13, the sensors 26a and 26b are turned off.

On the other hand, FIG. 5 shows a case where the number of hook ropes 16 is eight. Since the hook ropes 16 are not wound around the center head sheave 12c and the hook sheave 14c, four sensors 25a, 25b, 25d and 25e are provided. Is turned on, 25c is turned off, the sensor 26a on the left end of the boom 11 is turned on, and the sensor 26b is turned off. FIG. 6 shows a case where the number of hook ropes 16 is 7, and since the hook rope 16 is not wound around the head sheave 12a at the left end and the hook sheaves 14a and 14e at both left and right ends, four sensors 25b to 25e are turned on. 25a is turned off, and the rope socket 18 is fixed on the upper portion of the hook 13, so that the sensors 26a, 26a
b is turned off.

FIG. 7 shows a case in which the number of hook ropes 16 is 6, and the sensors 25c to 25e and the sensor 26b
8 is turned on, and FIG. 8 shows a case where the number of hook ropes 16 is 5, and the sensors 25c to 25e are turned on. 9 shows the case where the number of hook ropes 16 is four, the sensors 25c and 25e and the sensor 26b are turned on, and FIG. 10 shows the case where the number of hook ropes 16 is three and the sensors 25c and 25e are Turns on.

As described above, the combination of ON / OFF of the sensors 25a to 25e and 26a and 26b is determined in accordance with the number of hook ropes 16 to be hooked. Keep it.

[0021]

[Table 1]

When determining the number of hook ropes according to the mechanical specifications of the crawler crane, see FIG.
As shown in the figure, the sensors 25a to 25e and the sensor 2
The detection values of 6a and 26b are input to the control unit 27, and the detection results of these sensors are compared with the data of Table 1 stored in the memory 28. For example, the sensors 25a, 25b, 25
When the sensors d and 25e are on, the sensor 25c is off, and the sensor 26a is on, it is clear that the state shown in FIG.

Similarly, the sensors 25c, 25d, 25
When e is on, the sensors 25a and 25b are off, and the sensor 26b is on, it is clear that the state shown in FIG.

As described above, the control unit can automatically determine the number of hook ropes 16 based on the detection results of the sensors 25a to 25e and 26a and 26b. Number of ropes N
₁ can be automatically input, and input errors by the operator can be prevented.

The head sheave 12 and the hook sheave 1
Even if the quantity of 4 increases or decreases from this embodiment,
By installing a sensor 25 for each head sheave 12 and storing in advance a state of hanging according to the number of hooks, it is possible to determine the number of hook ropes 16 in the same manner as described above.

Thus, the present invention can be variously modified without departing from the spirit of the present invention, and it goes without saying that the present invention extends to the modified ones.

[0027]

As described above, in the present invention, the data of the position of the head sheave and the position of the rope socket where the hook rope is wrapped is previously stored in the memory for each setting state of the hook rope wrapping. The sensor that detects the presence of the hook rope wrapped around the head sheave and the detection result of each sensor that detects the presence of the rope socket are compared with the data stored in the memory to automatically determine the number of hook ropes that are hooked. Since the determination is made, the number of hook ropes hooked in the crane overload prevention device can be automatically input, so that the operability of the operator can be improved and input errors can be prevented.

In this manner, the suspension load in the crane overload prevention device is accurately calculated, and the delay of the alarm for the overload is eliminated, and the occurrence of an accident can be prevented beforehand. It is an invention that can contribute.

[Brief description of the drawings]

FIG. 1 is a side view of a crawler crane, showing an embodiment of the present invention.

FIG. 2 is a side view of a boom tip.

FIG. 3 is an explanatory view showing a state where ten hook ropes are hung.

FIG. 4 is an explanatory view showing a state in which nine hook ropes are hung.

FIG. 5 is an explanatory diagram showing a state in which eight hook ropes are hung.

FIG. 6 is an explanatory view showing a state in which seven hook ropes are hung.

FIG. 7 is an explanatory view showing a state in which six hook ropes are hung.

FIG. 8 is an explanatory diagram showing a state in which five hook ropes are hung.

FIG. 9 is an explanatory view showing a state in which four hook ropes are hung.

FIG. 10 is an explanatory view showing a state in which three hook ropes are hung.

FIG. 11 is a block diagram of a hook rope hooking number detecting device.

FIG. 12 is an explanatory diagram showing a balance of each moment such as a hanging load and a boom weight of the crane.

[Explanation of symbols]

 Reference Signs List 11 boom 12 head sheave 12a to 12e head sheave 13 hook 14 hook sheave 14a to 14e hook sheave 15 winch drum 16 hook rope 18 rope socket 25a to 25e sensor 26a, 26b sensor 27 control unit 28 memory

Claims (1)

[Claims] 1. A plurality of head sheaves are coaxially arranged at the tip of a boom, and a plurality of hook sheaves are coaxially arranged at a hook, and a hook rope pulled out from a winch drum is sequentially hung between the head sheave and the hook sheave. Turn, and further fix the rope socket to the end of the hook rope and fix it to the boom or hook, and in a crane that moves the hook up and down by lifting and lowering the hook rope, the existence of the rope socket fixed to the left side of the boom tip A sensor for detecting the presence / absence and a sensor for detecting the presence / absence of the rope socket fixed to the right side of the boom tip are provided, and a sensor for detecting the presence / absence of the hook rope wrapped around the head sheave is provided for each head sheave. The hook rope is hooked in advance for each hook rope The data of the position of the head sheave and the position of the rope socket are stored in a memory, and the detection result of each sensor is compared with the data stored in the memory. An apparatus for detecting the number of hook ropes of a crane, wherein the number is determined.