JP3088650U - Fall prevention device for backhoe fitted with two-barrel winch with interlock device - Google Patents

Abstract

(57) [Summary] [PROBLEMS] When a tension of a rope becomes excessive and a backhoe inclines beyond a set angle, a rope is loosened to prevent a fall and an alarm is generated. SOLUTION: When the inclination of the backhoe becomes equal to or greater than a set value, a signal current flowing from an inclination switch 42 is supplied to a circuit 70.
Flows to the electromagnets of the relays 65 and 66,
All the normally open contacts 66 are closed, the current of the power supply circuit 51d flows from the normally open contacts to the circuits 73, 75, 77, 78, and the windings B, B of the electromagnetic switching valves 19, 16 are energized to connect the rope. At the same time, current is supplied to the rotating light 45 and the alarm 46.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 According to the present invention, a backhoe is equipped with a two-body winch, and both ends of a wire rope wound around a pulley provided at a fixed position are wound around each body of the two-body winch, a load is hung on the wire rope, and the tension of the rope is increased. The present invention relates to a device in which a wire rope is wound up by one body while the wire rope is pulled out from the other body to carry a load.

[0002]

[Prior art]

 A device for mounting a backhoe equipped with a two-body winch in a forested area and transporting the cut timber by hanging it on a wire rope wound by the winch is disclosed, for example, in Utility Model Registration No. 3079187 according to the application of the present applicant. Is known by: At the place where the backhoe is installed, the scaffold is not necessarily strong, and the tension applied to the wire rope during the work is quite large.Therefore, when the stable load is exceeded, the backhoe gradually starts to tilt and may eventually fall. There is.

[0003]

[Problems to be solved by the invention]

 An object of the present invention is to prevent the backhoe from falling over due to the tension of a wire rope during a transport operation.

[0004]

[Means for Solving the Problems]

 One of the means for solving the above problem is, as described in claim 1, a first switching valve for supplying hydraulic oil from a hydraulic source to an operating circuit of a first hydraulic motor rotating a main winding drum. A first winch drive circuit device provided with a second hydraulic motor that supplies hydraulic oil from a hydraulic source to an operation circuit of a second hydraulic motor that rotates an auxiliary winding drum wound around a loop drawn from the main winding drum. A two-body winch having a second winch drive circuit device equipped with a switching valve is mounted on a backhoe, and a hydraulic motor drive device for driving a main winding drum and an auxiliary winding drum provided at fixed positions is interlocked to form a pulley. In a backhoe equipped with an interlock device and a two-body winch, in which the rope is wound and the rope is tensioned to convey a load, the backhoe is tilted to a predetermined value or more on the body of the backhoe. The tilt switch which generates an electrical signal is provided, the winding operation of the first switching valve and the second switching valve is stopped by the signal, characterized in that to start the lowering operation.

[0005] By the above-mentioned means, the tension of the rope is released, and the backhoe is prevented from tipping over.

According to a second aspect of the present invention, in the first aspect, a means for operating a rotary light and an alarm based on the signal is provided, and the inclination of the backhoe is reduced by the user. And will be able to take action.

[0007]

[Embodiment of the invention]

 Hereinafter, embodiments of the present invention will be described with reference to the drawings. Of the drawings, FIGS. 1 to 3 show a two-wheel winch hydraulic drive device mounted on the backhoe described in the Utility Model Registration Publication, and FIGS. 4 et seq. Show a hydraulic device including a backhoe fall prevention device. The electrical control diagram of the equipment is shown.

In FIG. 1, reference numeral 1 denotes a two-body winch mounted on a backhoe 2, and the tip of a wire rope 5 pulled out from a main winding drum 3 of the two-body winch 1 is wound around an auxiliary winding drum 4. An intermediate portion of the wire rope 5 is hung on a pulley 8 attached to a column 6 and a boom 7, and a lumber 10 to be collected on a hook 9 attached to the wire rope 5 is hung.

The lumber 10 is drawn to a collecting position near the backhoe 2 along with the wire rope 5 that is moved by the winding of the main winding drum 3 and the feeding of the auxiliary winding drum 4, where it is removed from the hook 9 and collected. Material. Then, by feeding the main winding drum 3 and winding the auxiliary winding drum 4, the wire rope 5 is returned to the original position as shown in FIG.

[0010] By maintaining a constant tension on the moving wire rope 5, it is possible to collect the wood 10 with one end of the wood 10 floating, thereby improving the workability. However, the constant tension is maintained. For this purpose, an interlock device having the configuration shown in FIG. 3 is provided in the drive circuit device of the two-barrel winch 1.

Referring to the apparatus of FIG. 3, the main winding drum 3 is driven by a first winch drive circuit device 11, and the auxiliary winding drum 4 is driven by a second winch device having substantially the same configuration as the first winch drive circuit device 11. Driven by the drive circuit device 12. The first winch drive circuit device 11 includes a first hydraulic motor 13 with a speed reducer connected to the main winding drum 3 and rotating the same, and a hydraulic pump mounted on the backhoe 2 to an operation circuit 14 of the first hydraulic motor 13. When the first switching valve 16 is switched to the switching position 16a, the hydraulic oil is supplied to the operating circuit 14a on the winding side. When the first hydraulic motor 13 rotates the main winding drum 3 so as to wind the wire rope 5 and switches the first switching valve 16 to the switching position 16b, the operating oil is supplied to the operating circuit 14b on the delivery side. The first hydraulic motor 13 rotates the main winding drum 3 so that the wire rope 5 is fed.

The second winch drive circuit device 12 is connected to the auxiliary winding drum 4 and rotates the auxiliary winding drum 4. The second hydraulic motor 17 is provided with a speed reducer, and the operating circuit 18 of the second hydraulic motor 17 is connected to the second winch driving circuit device 12 from the hydraulic source 15. A second switching valve 19 for controlling the supply of hydraulic oil is provided. When the second switching valve 19 is switched to the switching position 19a, hydraulic oil is supplied to the operating circuit 18a on the winding side, and the second hydraulic motor 17 is connected to the wire. When the auxiliary winding drum 4 is rotated so as to wind the rope 5 and the second switching valve 19 is switched to the switching position 19b, the operating oil is supplied to the operating circuit 18b on the delivery side, and the second hydraulic motor 17 is driven by the wire. The auxiliary drum 4 is rotated so that the rope 5 is paid out.

The configuration of the first and second winch drive circuit devices 11 and 12 is not particularly different from the conventional one, but in the present invention, the first and second winch drive circuit devices 11 and 12 are provided. The pilot-operated main relief valves 20 and 21 are provided in the operating circuits 14a and 18a on the winding upper side, respectively, and the pilot-operated sub-relief valves 24 and 25 are provided in the vent circuits 22 and 23 of the main relief valves 20 and 21, respectively. In addition, pilot switching valves 28, 29 are provided in the vent circuits 26, 27 of the respective relief relief valves 24, 25 so that the respective vent circuits 26, 27 are provided on the winding side or the feeding side of the respective circuit devices 11, 12. Are selectively connected to the operation circuits 14, 18. The first and second switching valves 16 and 19 are both of a manual type and an electromagnetic type, but are switched to an electromagnetic type in order to be controlled by an electric circuit described later. .

The relief set pressure of the main relief valves 20 and 21 is set to be higher than the relief set pressure of the sub relief valves 24 and 25, and the relief set pressure is selected by operating the pilot switching valves 28 and 29. By doing so, a difference is given to the upper limit of the operating pressure of the operating circuits 14 and 18 of the first and second winch driving circuits, and as a result, the wire rope 5 can be held in a certain tension and can be moved in or out. Become like Each of the pilot switching valves 28 and 29 may be of a manual type, but in the illustrated example, electromagnetic remote switching valves 30 and 31 are used, and the pilot pressure is supplied from a pilot pressure source 32 to the pilot pressure by excitation thereof. By acting on the switching valves 28 and 29, the switching operation is automatically performed. As the sub-relief valves 24 and 25, it is preferable to use those which can easily change the relief set pressure manually.

The first and second winch driving circuits 11 and 12 are provided with shuttle valves 33 and 34 for extracting the high pressure of the operating circuits 14 and 18, and the hydraulic pressure extracted by the shuttle valves 33 and 34 is used for the first and second hydraulic pressures. The motors 13 and 17 are guided to the brakes 35 and 36, and the brakes are released to enable rotation. The pressure from the pilot pressure source 32 is also introduced into the brakes 35 and 36. 37 and 38 are counter balance valves.

When the timber 10 is collected by the main winding drum 3, the first and second switching valves 16 and 19 are simultaneously operated to the switching positions 16a and 19a, and the hydraulic pressure source 15 is connected to the operating circuits 14a and 18a on the winding side. , 15 and further excites the remote switching valve 31 to switch the pilot switching valve 29 to release the pressure of the vent circuit 27 to the low-pressure delivery-side operating circuit 18b. The vent circuit 23 of the main relief 21 is controlled by the relief set pressure of 25. In the first winch drive circuit device 11 for driving the main winding drum 3, the pressure oil from the hydraulic pressure source 15 is supplied to the first hydraulic motor 13 through the check valve of the counter balance valve 37, and the main winding drum 3 is connected to the wire rope. 5 rotates in the direction to wind up.

The first and second hydraulic motors 13 and 17 simultaneously rotate to the upper side of the wire rope 5, but set the relief set pressure of the main relief valve 20 higher than the relief set pressure of the sub relief valve 25. By doing so, the torque generated in the main winding drum 3 becomes larger than the torque generated in the auxiliary winding drum 4, and the auxiliary winding drum 4 is reversed and the wire rope 5 is fed out. In this case, in the second winch drive circuit 12 for driving the auxiliary winding drum 4, the second hydraulic motor 17 self-primes the oil of the operating circuit 18b on the feeding side to perform the pump operation, and the upper winding operation The pressure oil in the circuit 18a is discharged from the main relief valve 21 to the tank via the operation circuit 18b on the delivery side, and tension is generated in the wire rope 5 according to the relief pressure set in the sub-relief valve 25. It can be collected in a suspended state.

In the example of FIG. 3, since the first and second winch drive circuit devices 11 and 12 have the same configuration, the wire rope 5 is operated while the tension is maintained by the auxiliary winding drum 4 by operating the remote switching valve 30. It is also possible to wind up the wire rope 5 while maintaining the tension of the wire rope 5 as shown in FIG.

As described above, the vent circuits 22, 21 of the main relief valves 20, 21 provided in the operating circuit on the winding side of the winch drive circuit device for driving the main winding drum 3 and the auxiliary winding drum 4 of the two-body winch, A pilot switching sub-relief valve 24, 25 is provided at 23, and pilot switching valves 28, 29 for selectively switching and connecting the vent circuits 26, 27 of the sub-relief valve to the winding upper side and the tank return side operation circuit. Because of the provision, the two-barrel winch can be interlocked so that the rope 5 is maintained at a constant tension, and the structure is simple and inexpensive, and the operation is easy.

FIG. 4 shows the details of the backhoe 2. The electromagnetic switching valves 16 and 19 and the electromagnetic valves 30 and 31 are installed on a table 41 adjacent to the cab 40, and the inclination of the backhoe 2 is further reduced. A tilt switch 42 for detection is provided and covered with a cover. In the drawing, reference numeral 43 denotes a control box, 44 denotes a battery, 45 denotes a rotating light, and 46 denotes an alarm, both of which operate when the backhoe 2 is tilted.

The tilt switch 42 is shown in FIGS. 5 and 6, in which a tilt switch main body 42a is fixed on a mounting table 42b, and the mounting table 42b includes a pair of spherical bodies 42c fixed to the table 41. The ball is held between the ball trays 42d and the posture is maintained, and the posture can be changed by the handle 42e. Levelers 42f and 42g are attached to the mount 42b at right angles by U-shaped bolts 42f1. By adjusting the mount 42b so that both the levelers are horizontal, the tilt switch main body 42a is horizontally mounted. Is done.

FIG. 7A is an electric circuit diagram for controlling the hydraulic circuit. At the right end of the figure, the electromagnetic hydraulic switching valves 16 and 19, the electromagnetic valves 30 and 31 and the rotation for alarm are shown. A light 45 and an alarm 46 are shown, and the tilt switch 42 is shown on the left end side. In the electromagnetic oil pressure switching valves 16 and 19, A is a hoisting coil, B is a unwinding coil, and the power supply battery of the control box 43 is indicated by 44. Reference numeral 47 denotes an electromagnetic valve for opening and closing the hydraulic paths of the hydraulic sources 15 and 15 shown in FIG. 3, reference numeral 48 denotes a remote control transmitter, reference numeral 49 denotes an antenna, reference numeral 50 denotes a receiver, and transmitter 48 includes power buttons P and 6. It has push buttons.

The power supply circuit 51 is branched into power supply circuits 51a to 51d, the power supply circuit 51a is connected to the inclined switch 42, the power supply circuit 51b is connected to normally open contacts of relays 67 and 68 described later, and the power supply circuit 51c is connected to the receiver 50. , 51d are connected to normally open contacts of relays 61-66.

The relays 61 to 66 have an electromagnet m, one normally closed contact b, and three normally open contacts a, as shown only in the relay 61. The relays 67 and 68 are shown in FIG. As shown in FIG. 5, the electromagnet m is provided between the terminals fg and the normally open contact h is provided between the terminals ce. From the receiver 50, six circuits 52 to 57 for branching and sending the current of the power supply circuit 51c are branched, and an earth path 58a connected to the earth path 58 is provided. The power supply circuit 51d is connected from the branch points 51d1, 51d2, 51d3 provided thereto to the terminals shown above the normally open contacts of the relays 61 to 66, and the ground circuit 58 is connected to the electromagnet m of the relays 61 to 66. It is connected to the lower terminal, and in relays 67 and 68, it is connected to terminal g.

The right circuit 52 extending from the receiver 50 is connected to the electromagnet m of the relay 61 via the normally closed contact of the relay 62, and the circuit 53 is connected to the electromagnet of the relay 62 via the normally closed contact b of the relay 61. The circuit 54 is connected to the electromagnet of the relay 63, and the circuit 56 is connected to the electromagnet of the relay 64. The circuit 55 is connected to a normally closed contact of a relay 65 at a branch point 55a, and to a normally open contact between the relays 61 and 62 at a branch point 55b. A circuit 57 is connected to a normally closed contact of a relay 66 at a branch point 57a. The branch point 57b is connected to the normally open contact on the left end of the relays 61 and 62. A circuit 59 extending from the center normally open contact point of the relays 63 and 64 and joining at a point 59a is connected to a circuit 60 from the normally open contacts of the relays 67 and 68 to the solenoid valve 47.

The circuit 70 extending from the tilt switch 42 is connected to the electromagnets of the relays 65 and 66 by a line extending from the branch point 70a.

Output circuits 71 to 78 are provided from the lower terminals of the relays 61 to 66 toward the controlled member, a circuit 71 extends from a normally open contact on the right end of the relay 61, and a circuit 72 is provided on the right end of the relay 62. From the normally open contact, the circuit 73 is from the normally open contact on the right end of the relay 63, the circuit 74 is from the normally closed contact on the relay 65, the circuit 75 is from the normally open contact on the left end of the relay 66, and the circuit 76 is normally closed on the relay 66. From the contacts, circuit 77 extends from the central normally open contact of relay 66, and circuit 78 extends from the central normally open contact of relay 65.

The circuit 74 is connected from the branch point 74a to the terminal f of the electromagnet of the relay 68, and the circuit 76 is connected from the branch point 76a to the terminal f of the electromagnet of the relay 67. The ground path 58 is connected from the branch point 58b to the terminals g of the relays 67 and 68.

FIG. 8 et seq. Illustrate the operation of the electrical circuit of FIG. 7A, which is activated by pressing one of the buttons 1-6 of the transmitter 48. Active circuits are indicated by bold lines for easy identification.

FIG. 8 is an operation diagram when the main hoisting push button 1 of the remote controller 48 is pressed. The current passing through the circuit 57 passes through the relay 66 and the main hoisting coil A of the electromagnetic hydraulic switching valve 16. At the same time, the electromagnet of the relay 67 is actuated, and the current of the circuit 51b flows to the hydraulic valve solenoid valve 47 to open the valve. 3 rotates to the winding upper side.

FIG. 9 is an operation diagram when the push button 2 for lowering the main winding is pressed. The electromagnet m of the relay 64 is actuated by the current passing through the circuit 56, and the normally open contact of the relay 64 is closed. The current of the power supply circuit 51d flows through the circuit 75 and the circuit 59, the solenoid valve 47 is opened, the main winding coil B of the switching valve 16 is excited, and the main winding drum 3 is rotated to the lowering side.

FIG. 10 is an operation diagram when the push-up button 3 for auxiliary winding is pressed. The current passing through the circuit 55 passes through the normally closed contact of the relay 65 from the circuit 74 to the auxiliary winding coil for the switching valve 19. A is fed to the port A on the winding side of the switching valve 19, and the auxiliary winding drum 4 rotates to the winding side. At this time, the relay 68 is operated by the current flowing from the branch point 74 a of the circuit 74, and the current of the power supply circuit 51 b flows to the solenoid valve 47 via the relay 68.

FIG. 11 is an operation diagram when the push button 4 for auxiliary winding lowering is pressed. A current passing through the circuit 54 flows to the electromagnet of the relay 63, the two normally open contacts are closed, and the power supply is turned off. The current of the circuit 51d is input to the auxiliary winding coil B and the solenoid valve 47 is opened via the circuit 59, so that the auxiliary drum 4 rotates to the lowering side.

FIG. 12 is an operation diagram when the push button 5 for the interlock main winding is pressed. The current passing through the circuit 53 is supplied to the electromagnet of the relay 62 via the normally closed contact of the relay 61, Close the three normally open contacts 62. Thereby, the current of the power supply circuit 51d is sent from the right end contact of the relay 62 to the solenoid valve 31 via the circuit 72, and the solenoid valve 31 is opened. The current passing through the second contact from the right of the relay 62 excites the auxiliary winding coil A of the switching valve 19 from the circuit 74 via the normally closed contact of the relay 65, activates the relay 68, and activates the solenoid valve 47. Energize in the opening direction. The current passing through the third contact from the right of the relay 62 passes through the junctions 57b and 57a and the normally closed contact of the relay 66 to excite the main winding coil A of the switching valve 16 from the circuit 76 and to branch the junction 76a. After that, the relay 67 is operated to excite the solenoid valve 47 in the opening direction.

In this state, both drums are interlocked as described in the description of FIG. 3, the main winding drum 3 rotates to the winding side, and the auxiliary winding drum 4 tries to rotate to the winding side. Then, the hydraulic motor 17 is rotated in the feeding direction opposite to the driving direction by the tension of the rope 5 to be in a pump state, and the tension of the rope 5 is maintained.

FIG. 13 is an operation diagram when the push button 6 for interlock auxiliary winding is pressed. The current passing through the circuit 52 is supplied to the electromagnet of the relay 61 through the normally closed contact of the relay 62, The three normally open contacts are closed. Thus, the current of the power supply circuit 51d is sent from the right end contact of the relay 61 to the solenoid valve 30 via the circuit 71, and the solenoid valve 30 is opened. A current passing through the second contact from the right of the relay 61 excites the auxiliary winding coil A of the switching valve 19 from the circuit 74 through the normally closed contact of the relay 65 from the branch point 55b, and hoists the auxiliary winding drum 4. And the solenoid 68 is operated to excite the solenoid valve 47 in the opening direction. The current passing through the third contact from the right of the relay 61 passes through the normally closed contact of the relay 66, excites the main winding coil A of the switching valve 16 from the circuit 76, and switches the relay 67 through the branch point 76a. It operates to excite the solenoid valve 47 in the opening direction, and interlock auxiliary winding is performed.

FIG. 14 is an operation diagram when the backhoe is tilted and the tilt switch 42 detects the set angle of the tilt limit. A signal output from the middle contact point of the tilt switch 42 in the figure is transmitted from the circuit 70 to the relay 65. , 66, open the normally closed contacts of both relays, close all the normally open contacts, and connect the power supply circuit 51d to the circuit 73 from the left contact of the relay 65 to the circuit 73 from the center contact to the circuit 78 and the alarm 46. The power supply circuit 51d is connected from the left contact of the relay 66 to the circuit 75, and the central contact of the relay 66 is connected to the circuit 77 and the rotating light 45.

Accordingly, the coils B, B on the lowering side of the electromagnetic switching valves 16, 19 are actuated by the signal of the tilt switch 42 to start the lowering operation on the drums 3, 4, and release the tension of the rope 5. The backhoe can be prevented from overturning, and the rotating light 45 and the alarm 46 can be activated.

[0039]

[Effect of the invention]

 As described above, according to the first aspect of the present invention, when the inclination of the backhoe exceeds the set value when the rope is hoisted, the main winding drum and the auxiliary winding drum are driven in the lowering direction by the signal generated from the inclination switch. The tension is released and the backhoe can be prevented from falling. According to the second aspect of the present invention, a warning is generated by the rotating light and the alarm when the signal of the tilt switch is generated, so that the worker can immediately take an appropriate action.

[Brief description of the drawings]

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

FIG. 2 is a side view of the extended state of FIG.

FIG. 3 is a hydraulic circuit diagram of the present invention.

FIG. 4 is a side view of the backhoe.

FIG. 5 is a plan view of a tilt switch.

FIG. 6 is a front view of the tilt switch.

FIG. 7 is an electric circuit diagram for controlling a hydraulic circuit.

FIG. 8 is an electric circuit diagram of a main winding state.

FIG. 9 is an electric circuit diagram of the main winding-down state.

FIG. 10 is an electric circuit diagram of the auxiliary winding state.

FIG. 11 is an electric circuit diagram of the auxiliary winding lowering state.

FIG. 12 is an electric circuit diagram of an interlock main winding state.

FIG. 13 is an electric circuit diagram in an interlock auxiliary winding state.

FIG. 14 is an electric circuit diagram when the tilt switch is activated.

[Explanation of symbols]

1 2 body winch, 3 main winding drum, 4 auxiliary winding drum,
5 Rope, 11 First winch drive circuit device, 12
2nd winch drive circuit device, 13 1st hydraulic motor, 1
4.18 operation circuit, 14a / 18a winding upper operation circuit, 15 hydraulic power source, 16 first switching valve, 17 second hydraulic motor, 19 second switching valve, 20/21 main relief valve, 22/23/26 / 27 vent circuit, 24/25
Sub relief valve, 28/29 pilot switching valve, 3
0.31 remote switching valve, 42 tilt switch, 43
Control box, 47 solenoid valve, 48 remote control transmitter, 49 antenna, 50 receiver, 51a-5
1d power circuit, 61-68 relay

Claims (2)

[Utility model registration claims] 1. A first winch drive circuit device having a first switching valve for supplying hydraulic oil from a hydraulic source to an operation circuit of a first hydraulic motor that rotates a main winding drum, and a first winch drive circuit device drawn from the main winding drum. And a second winch drive circuit device having a second switching valve for supplying hydraulic oil from a hydraulic source to an operating circuit of a second hydraulic motor that rotates the auxiliary winding drum wound around the rope. The hydraulic motor drive device that drives the main winding drum and the auxiliary winding drum provided at the fixed position is interlocked, the rope is wound around the pulley, and the rope is tensioned to carry the load, In a backhoe equipped with a two-body winch with an interlock device, a tilt switch that generates a signal when the backhoe tilts to a predetermined value or more is provided on a body of the backhoe,
The lifting operation of the first switching valve and the second switching valve is stopped by the signal, and the lowering operation is started.
A fall prevention device for a backhoe equipped with a two-body winch with an interlock device. 2. The twin-barrel winch device according to claim 1, further comprising means for operating a rotating light and an alarm in accordance with the signal.