JPH057785U - Deep dig alarm for excavator - Google Patents

Abstract

(57) [Summary] [Purpose] To improve the operating rate of excavating machines and prevent deep digging due to operator's carelessness. [Structure] From the start of hoisting of the winch drum 7 after the excavation device (eg, grab bucket) 6 has been dropped and excavated, the rotation of the winch drum 7 is detected by a rotation detector 17, and the pressure rise of the hydraulic circuit is detected by a pressure detector 19, respectively. The detection signal obtained by these detectors 17 and 19 is detected by the calculator 2
2, the ascending movement amount of the excavator 6 is calculated, and the result is compared with the casing tube 9 length previously input from the setter 21 to the calculator 22, and when the two values become substantially equal to each other. , A signal is sent from the computing unit 22 to the alarm unit 23 to activate the alarm unit 23 to notify the operator that the deep digging state will occur.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a deep digging alarm device for an excavating machine such as a boring machine.

[0002]

[Prior Art]

 A conventional all-casing boring machine will be described with reference to FIGS. 5 to 8. 1 in FIG. 5 is a traveling device, and a main body 2 is mounted on the traveling device 1. A boom 3 and a winch 7 are provided on the main body 2, a pulley 4 is attached to the tip of the boom 3, and a wire 5 extending from the winch 7 passes through the pulley 4 and a grab bucket 6 as shown in FIGS. 5 to 8. The grab bucket 6 is attached to the slab and is supported in a suspended state.

Further, 8 is a glove that is openably and closably attached to the lower end (tip) of the club bucket 6, 9 is a casing tube, and 10 is a pushing device for the casing tube 9 that is attached to the front part of the main body 2. , 11 are the cutting edges of the casing tube 9, and 12 is the ground. In the all-casing boring machine shown in FIG. 5 to FIG. 8, when excavating the ground, first, the pushing device 10 drives the casing tube 9 and pushes it into the ground 12, and the cutting edge 11 of the casing tube 9 is pushed. When it penetrates into the ground 12, the wire 5 is loosened, and the grab bucket 6 is dropped by gravity into the ground 12 in the casing tube 9 to penetrate into the earth and sand in the casing tube 9, and then the wire 5 is pulled to grab the grab bucket. 8 is closed, soil and sand are scraped into the casing tube 9 for storage, and then the grab bucket 6 is pulled up and soil is discharged to complete one cycle of excavation.

After that, pushing of the casing tube 9, excavation by the grab bucket 6, and soil removal are repeatedly performed to form an excavation hole having a predetermined depth (see FIGS. 6 and 7).

[0005]

[Problems to be solved by the device]

 In the conventional all-casing boring machine shown in FIGS. 5 to 8, the casing tube 9 is pushed, the grab bucket 6 excavates, and the soil is repeatedly discharged to form an excavation hole having a predetermined depth. There is no method to measure and detect the distance L (see Fig. 8) between the cutting edge 11 of the grab bucket 9 and the surface of the earth and sand excavated by the grab bucket 6 (see 12) accurately and simply. The tip) may excessively precede the cutting edge 11 of the casing tube 9 to excavate the earth and sand deeper than the cutting edge 11 of the casing tube 9, and the earth and sand of the cutting face 13 deeper than the cutting edge 11 may reach the earth pressure. As a result, the earth and sand around the casing tube 9 move in the direction of the arrow 14 to form a void.

Therefore, it is necessary to stop the boring machine and measure the excavation depth, which causes a problem that the operating rate of the boring machine is reduced. The present invention is proposed in view of the above problems, and its purpose is to provide a deep digging alarm device for a drilling machine capable of improving the operating rate of the drilling machine and preventing deep digging due to operator's carelessness. Is in the point of trying to provide.

[0007]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention attaches an excavator to the lower end of a wire rope hanging from a winch drum via a pulley on a boom, drops the excavator on the earth and sand in a casing tube, and then lifts it. As a result, in an excavating machine for excavating and discharging earth and sand in the casing tube, the excavator passing detector provided at the upper end of the casing tube and the hydraulic circuit of the hydraulic motor for driving the winch drum are provided. The pressure detector for winch hoisting detection, the rotation detector provided on the winch, the setter for setting the casing tube length, and the movement amount of the excavator in the casing tube based on the detection signals from the detectors. Calculated and compared the result with the casing tube length from the setter, and output when both values become substantially equal That calculator and, ingredients Eteiru and alarm actuated by the output from the arithmetic unit.

[0008]

[Action]

 The deep digging alarm device of the excavating machine of the present invention is configured as described above, and the rotation of the winch drum is detected by the rotation detector from the start of winding the winch drum after the drop excavation of the excavating device (eg grab bucket). Pressure rises in the circuit are detected by pressure detectors respectively, and the detection signals obtained by these detectors are sent to a calculator to calculate the amount of upward movement of the excavator, and the result and the setter to a calculator. The casing tube length input in advance is compared, and when the two values become substantially equal, a signal is sent from the calculator to the alarm device to activate the alarm device and inform the operator that the deep digging condition will be reached.

[0009]

【Example】

 The deep digging alarm device of the excavating machine according to the present invention will be described below with reference to an embodiment shown in FIGS. 1 and 2. In FIG. ), 7 is a winch drum, 8 is a glove, and 9 is a casing tube. The earth and sand inside the casing tube 9 are excavated and discharged by dropping the earth and sand inside and then lifting it up.

Reference numeral 16 is a hydraulic motor for driving the winch drum 7, and 17 is a rotation detector provided on the winch drum 7. The rotation detector 17 can detect the rotation direction and the rotation speed of the winch drum 7. is there. Reference numeral 18 is a high pressure selection valve provided in the hydraulic circuit of the drive hydraulic motor 16, 19 is a winch hoisting detection pressure detector provided in the high pressure selection valve 18, and 20 is excavation provided in the upper end of the casing tube 9. As the equipment passage detector (bucket detector), the excavation equipment passage detector 20 is, for example, a proximity switch (optical, ultrasonic, or infrared type proximity switch).

Reference numeral 21 is a setter for setting the casing tube length, 22 is a computing unit connected to each of the detectors 17, 19 and 20 and the setting unit 21, and 23 is an alarm unit connected to the computing unit 22. is there. FIG. 2 shows a hydraulic circuit of the driving hydraulic motor 16. 25 is a power source engine, 26 is a hydraulic pump driven by the engine 25, 27 is a main relief valve, 28 is an oil passage switching valve, 29 is an overload relief valve, 30 is a counter balance valve, 31 is a winch drum. 7 is a braking device, 32 is a clutch for transmitting power when the winch drum 7 is driven, and 24 is a speed reducer interposed between the hydraulic motor 16 and the winch drum 7.

Next, the operation of the deep digging alarm device of the excavating machine shown in FIGS. 1 and 2 will be specifically described. (1) First, the operator inputs the length of the casing tube 9 from the setter 21 to the calculator 22. (2) The state where the grab bucket 6 falls freely and bites into the ground in the casing tube 9 as shown in FIG. 1 (the winch drum 7 rotates in the unwinding direction, and the grab bucket 6 moves to the excavator passing detector 20). 2), the oil passage switching valve 28 of FIG. 2 is switched from the state of 28a to the state of 28c. At this time, the brake device 31 is released and the clutch 32 is connected.

The winch drum 7 is wound up by the above operation. At the start of this winding, the wire rope 5 is slack, so no pressure builds up in the hydraulic circuit of the drive hydraulic motor 16, but the grab 8 of the grab bucket 6 closes, the slack in the wire rope 5 disappears, and the grab bucket 6 winds up. Then, the pressure in the hydraulic circuit of the driving hydraulic motor 16 increases. This pressure rise is detected by the pressure detector 19, and the obtained detection signal is sent to the calculator 22. Further, the rotation of the winch drum 7 is detected by the rotation detector 17, and the obtained detection signal is sent to the calculator 22. (3) At this time, the calculator 22 calculates the amount of upward movement of the grab bucket 6 from the start of winding based on the detection signal from the pressure detector 19 and the detection signal from the rotation detector 17.

Eventually, the upper end of the grab bucket 6 reaches the excavator passing detector 20. At this time, the excavation machine passage detector 20 starts to send a detection signal to the calculator 22, and when the lower end of the grab bucket 6 passes the excavation machine passage detector 20, the excavation machine passage detector 20 calculates the detection signal. It will not be sent to the container 22. The calculator 22 terminates the calculation of the amount of upward movement of the grab bucket 6 from the start of winding. (4) Then, the computing unit 22 detects the length of the casing tube 9 input from the setting unit 21 to the computing unit 22 as described above, and the lower end of the grab bucket 6 from the start of winding the grab bucket 6 to the excavator passing detector 20. Comparing the upward movement amount of the grab bucket before passing, if both values become almost equal (when the upward movement amount of the excavator is likely to be longer than the casing tube length), the calculator 22 → the alarm device 23 To activate the alarm 23 to let the operator know that a deep digging condition will occur.

FIG. 4 shows a flow chart of the above calculation.

[0016]

[Effect of the device]

 As described above, the deep digging alarm device of the excavator of the present invention detects the rotation of the winch drum from the start of hoisting the winch drum after the excavation device (eg, grab bucket) is dropped and excavated by the rotation detector to increase the pressure in the hydraulic circuit. Are detected by the pressure detectors respectively, and the detection signals obtained by these detectors are sent to the calculator to calculate the amount of ascent of the excavation equipment, and the result and the calculator are input to the calculator in advance. When the casing tube length is compared and the two values become approximately equal, a signal is sent from the calculator to the alarm to activate the alarm and inform the operator of the deep digging condition. Since it is not necessary to stop the operation and measure the depth of excavation, the operating rate of the excavating machine can be improved and deep excavation due to the carelessness of the operator can be prevented.

[Brief description of drawings]

FIG. 1 is a system diagram showing an embodiment of a deep digging alarm device of an excavating machine according to the present invention.

FIG. 2 is a hydraulic circuit diagram of a driving hydraulic motor of the deep digging alarm device.

FIG. 3 is an explanatory diagram of a hydraulic motor pressure, a bucket detector signal, and a bucket movement amount.

FIG. 4 is a flow chart of a computing unit of the deep digging alarm device.

FIG. 5 is a side view showing a conventional all-casing boring machine.

FIG. 6 is an operation explanatory view of a grab bucket of the boring machine.

FIG. 7 is an operation explanatory view of a grab bucket of the boring machine.

FIG. 8 is an explanatory diagram showing a problem of the boring machine.

[Explanation of symbols]

 3 Boom 4 Pulley 5 Wire rope 6 Excavator (Grab bucket) 7 Winch drum 8 Grab 9 Casing tube 16 Hydraulic motor for driving winch drum 7 Rotation detector 19 Pressure detector for winch hoisting detection 20 Excavator passage detector 21 Setting Device 22 Operation device 23 Alarm device

Claims (1)

[Claims for utility model registration] [Claim 1] An excavator is attached to the lower end of a wire rope that hangs from a winch drum via a pulley on a boom.
Drop the excavator on the sediment inside the casing tube,
Then, in an excavating machine for excavating and discharging earth and sand in the casing tube by lifting, an excavator passage detector provided at the upper end of the casing tube,
Pressure detector for winch winding detection provided in the hydraulic circuit of the hydraulic motor for driving the winch drum, rotation detector provided in the winch, setting device for setting the casing tube length, and detection from each of the detectors. A calculator that calculates the amount of movement of the excavating device in the casing tube based on the signal, compares the result with the casing tube length from the setter, and outputs when both values are substantially equal,
A deep digging alarm device for an excavating machine, comprising: an alarm device that is activated by an output from the arithmetic unit.