JP4834870B2 - Work vehicle for steep slopes - Google Patents

Description

The present invention relates to a steep slope working vehicle used for civil engineering work on a steep slope.

Conventional civil engineering vehicles work while traveling on the ground in an endless track, but it is difficult to work on steep slopes, and there is also a risk of falling accidents. It was. Therefore, a winch is provided in the vehicle body, a wire is wound around the winch, and the wire is connected to a tree or an anchor at an upper position of the inclined surface, thereby supporting the vehicle body with the wire and enabling work on a steep slope. There is an aerial civil engineering work vehicle that prevents the body from falling.
JP-A-9-95981

  However, the above-described high-tech civil engineering work vehicle lifts and lowers the work vehicle by winding and unwinding the wire with a winch, and only the wire supports the vehicle body. Therefore, if the wire is aged, or if the wire is overloaded and the wire breaks, there will be no support for the work vehicle, so the work vehicle will fall and it will be very dangerous. There is a problem of being damaged.

  The present invention has been made in view of the above-mentioned drawbacks of the prior art, and an object thereof is to provide a work vehicle for steep slopes that can prevent a wire from being dropped even when a wire is cut during work on a steep slope. .

  The means of the present invention according to claim 1 configured to solve the above-described problem includes a lower traveling body, a movable support body whose front end is pivotally supported by the lower traveling body, the lower traveling body, and the movable body. The work vehicle body is constituted by a hydraulic cylinder connected between the support body and moving the movable support body up and down, an upper swing body mounted on the movable support body, and a work front provided on the upper swing body, A wire winch device in which a pair of left and right support wires is stretched between a support body installed above an inclined ground and the lower traveling body via a movable pulley mechanism body, and is mounted on the movable pulley mechanism body and the lower traveling body. And an elevating wire is stretched between them, and a drop prevention mechanism for holding the supporting wire when the elevating wire is disconnected is provided in the movable pulley mechanism.

  The fall prevention mechanism is displaceably provided at a base portion of the movable pulley mechanism body, a lock piece capable of holding the support wire between the base portion, and a space between the lock piece and the base portion. And is connected between the lock piece and the elevating wire, and is locked by the tension acting on the elevating wire. It is good to comprise a piece with the action body holding it in the state separated from the support wire against the energizing force of the elastic body.

  Further, the lock piece may be constituted by an eccentric cam pivotally supported on the base portion.

Since the present invention is configured as described above, the following effects can be obtained.
(1) In addition to the lifting wire for raising and lowering the work vehicle main body, a support wire is stretched between the work vehicle main body and the support body. Since the supporting wire is held, it is possible to prevent the work vehicle main body from falling, to ensure the safety of the work site, and to prevent the work vehicle main body from being damaged.
(2) Since a pair of supporting wires are stretched on the left and right, the work vehicle body can be more reliably supported and falling can be prevented.
(3) The support wire is stretched between the support body and the work vehicle main body via the movable pulley mechanism body, and the lifting wire is stretched between the movable pulley mechanism body and the wire winch device. Then, by winding and rewinding the lifting wire with the wire winch device, the work vehicle body can be moved up and down a distance double the length of the winch that has been wound and rewound. It can be carried out.
(4) Since the elevating wire and the pair of left and right supporting wires support the work vehicle body, the elevating and lowering can be stably performed without breaking the left and right balance.
(5) Since the lifting wire and the pair of left and right support wires support the weight of the work vehicle body during lifting, the load on each wire can be reduced.
(6) The lock piece constituting the fall prevention mechanism is constantly applied with an urging force in the holding direction by the elastic body, but resists the urging force of the elastic body through the operating body by the tension acting on the lifting wire. Since the holding wire is held away from the support wire, it is possible to prevent the work vehicle body from dropping by holding the support wire instantaneously when the lifting wire is broken.
(7) Since the lock piece constituting the fall prevention mechanism is displaceably provided and the lock piece is configured to hold the supporting wire only when the lifting wire is broken, the lifting wire is Until the wire is cut, the support wire does not support the work vehicle to prevent the vehicle from falling, and the lock piece and the support wire are not worn or deteriorated unnecessarily.
(8) Since the lock piece is formed of an eccentric cam, the fall prevention mechanism can be easily configured with a small number of parts, and the production period and cost can be reduced. Moreover, since the structure is simple, the certainty of operation can be ensured.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the figure, reference numeral 1 denotes a steeply inclined work vehicle. Reference numeral 2 denotes a work vehicle main body constituting the work vehicle 1 for steep slopes, and 3 denotes a lower traveling body constituting the work vehicle main body 2 and having an endless track for the work vehicle main body 2 to travel. Reference numeral 4 denotes a movable support having a front end pivotally supported on the front end of the lower traveling body 3, and the movable support 4 can be moved up and down in the direction B and B with the front end as a center. Reference numeral 5 denotes a hydraulic cylinder connected between the movable support 4 and the lower traveling body 3, and the movable support 4 is moved up and down by expanding and contracting the hydraulic cylinder 5. Reference numeral 6 denotes an upper swing body that is installed on the movable support 4 so as to be swingable via a known swing device 7. Reference numeral 8 denotes a work front as a work mechanism attached to the upper swing body 6. The work front 8 has an arm 9 having a bucket 9 </ b> A at the tip of the work front 8, and a plurality of hydraulic cylinders 10 for operating the arm 9. 10.

  Reference numeral 11 denotes a support wire fixing portion provided at the front end of the lower traveling body 3 in order to connect a support wire 12 described later. Reference numerals 12 and 12 denote a pair of left and right support wires having one end connected to the support wire fixing portion 11, and the other end of each support wire 12 is connected to the support 21 via a moving pulley mechanism 31 described later. By connecting, the supporting wire 12 is stretched between the lower traveling body 3 and the supporting body 21. Reference numeral 13 denotes a wire winch device provided in front of the lower traveling body 3. Reference numeral 14 denotes an elevating wire having one end wound around the drum of the wire winch device 13, and the other end of the elevating wire 14 is connected to an operating body 48 to be described later, and the elevating wire 14 is connected to the wire winch device 13. The work vehicle body 2 is moved up and down on a steep slope by winding and unwinding.

  Reference numeral 21 denotes a support for supporting the steeply inclined work vehicle 1 from above. The support 21 is made of a steel flat plate, and is located between an anchor or a large tree (not shown) provided above or on the upper end of an inclined ground and a pair of left and right suspension holes 22 provided on the left and right ends of the support 21. By suspending the suspending wires 23 and 23, the suspending wires 23 and 23 are suspended from the work vehicle main body 2 at a position above the slope. Reference numeral 24 denotes a pair of left and right latching holes provided in the support body 21 for latching the support wire 12, and the other end of the support wire 12 having one end fixed to the support wire fixing portion 11 is latched. The supporting wire 12 is stretched by being hooked in the hole 24. 25 and 25 are a pair of fixed pulleys pivotally supported on the support body 21 so that the support wire 12 is wound.

  Reference numeral 31 denotes a moving pulley mechanism constituting the work vehicle 1 for steeply inclined terrain. Reference numeral 32 denotes a base portion made of a steel flat plate constituting the movable pulley mechanism 31. Reference numeral 33 denotes a moving pulley that winds the supporting wire 12 pivotally supported on the base portion 32. Then, the supporting wire 12 having one end fixed to the supporting wire fixing portion 11 is wound from the fixed pulley 25 to the moving pulley 33, and the other end is hooked to the hooking hole 24, whereby a moving pulley mechanism is obtained. The body 31 is provided between the support body 21 and the work vehicle main body 2.

  Reference numeral 41 denotes a fall prevention mechanism provided on the base 32. Reference numerals 42 and 42 denote a pair of left and right lock pieces constituting the fall prevention mechanism 41. Each lock piece 42 is substantially L-shaped, and an outer corner portion that fits into a lock piece receiving portion 43 described later is formed on a holding curved surface 42A, and an elastic body 45 described later is provided at one end. An elastic body connecting hole 42B for connection is formed, and a connecting wire connecting hole 42C for connecting a connecting wire 46 described later is formed at the other end. The lock piece 42 is displaced from the center of gravity on the base 32 and is pivotally supported, thereby forming an eccentric cam that can rotate in the direction C.

  Reference numeral 43 denotes a lock piece receiving portion that holds the support wire 12 when the lock piece 42 is fitted. The lock piece receiving portion 43 is located outside the lock piece 42 and is provided in a pair at both left and right ends of the base portion 32, and a concave curved holding surface 43A to which the holding curved surface 42A of the lock piece 42 is fitted. Is formed on the inner surface. The support wire 12 is provided between the lock piece receiving portion 43 and the lock piece 42 so that the support curved wire 42A is engaged with the hold surface 43A so that the support wire 12 is held. It has become.

  44, 44... Indicate a pair of guide roller bodies respectively provided above and below the lock piece receiving portion 43. Each guide roller body 44 is composed of a pair of left and right rollers 44A and 44B so as to sandwich the support wire 12, and the support wire 12 is accurately positioned between the lock piece 42 and the lock piece receiving portion 43. It is guided to be located.

  Reference numeral 45 denotes an elastic body stretched between the elastic body connection hole 42 </ b> B formed at one end of the lock piece 42 and the base portion 32. In this embodiment, a tension spring is used as the elastic body 45. The elastic body 45 is stretched in a sufficiently stretched state. When the elastic body 45 is contracted, the lock piece 42 is fitted into the lock piece receiving portion 43 and rotates in the direction (c) in which the support wire 12 is held. It is energized as follows. Reference numeral 46 denotes a connection wire having one end connected to the connection wire connection hole 42C of the lock piece 42. The connection wire 46 has one end connected to the connection wire connection hole 42C and the other end connected to an operating body 48 described later. As a result, it is stretched in an L shape via a guide pulley 47 pivotally supported on the base 32.

  Reference numeral 48 denotes a rod-shaped operating body having one end connected to the connecting wire 46 and the other end connected to the upper end of the lifting / lowering wire 14. The operating body 48 is formed with a protruding portion 48A protruding in the left-right direction. It is. With this configuration, the elevating wire 14 and the lock piece 42 are connected via the operating body 48 and the connecting wire 46. While the lifting wire 14 is not cut, the tension of the lifting wire 14 resists the urging force of the elastic body 45, and the lock piece 42 is attached to the support wire 12 via the operating body 48 and the connecting wire 46. The holding curved surface 42 </ b> A and the holding surface 43 </ b> A are separated from each other by urging them so as to rotate in a direction opposite to the holding direction (dual direction).

  Reference numeral 49 denotes an operating body stopper including a pair of protrusions provided on the base 32 so as to sandwich the operating body 48. When the protrusion 48A is engaged with the operating body stopper 49, the operating body 48 is locked so that the operating body 48 is not further pulled downward, and the wire winch device 13 winds the lifting wire 14. As a result, the work vehicle body 2 can be raised.

  Reference numeral 50 denotes a protrusion-like lock piece stopper, and the lock piece stopper 50 is provided between the lock piece 42 and the lock piece receiving portion 43 and provided on the base 32. The lock piece stopper 50 prevents the lock piece 42 and the support wire 12 from inadvertently contacting each other so that the lock piece 42 does not rotate further in the two directions.

  The present embodiment has the above-described configuration, and the operation thereof will be described next. When working on an inclined surface, an anchor (not shown) is first projected above the inclined ground. Then, one end of a pair of suspension wires 23, 23 is attached to the anchor. In addition, when a large tree grows above the slope, the large tree may be used instead of the anchor. Then, by connecting the other end of the suspension wire 23 to the support 21, the work vehicle body 2, the support wires 12 and 12, the lifting wire 14, the support 21, the movable pulley mechanism 31, and the fall prevention A steeply inclined work vehicle 1 including a mechanism 41 is disposed on an inclined surface. As a result, the work vehicle body 2 is supported via the suspension wire 23, the support body 21, the support wire 12, and the lifting wire 14 with the lower traveling body 3 in contact with the inclined surface. However, the work vehicle main body 2 can work without falling.

  Furthermore, since the operating body 48 to which the lifting wire 14 is connected is configured so that the protrusion 48A is engaged with the operating body stopper 49 and is not pulled further downward, the lifting wire 14 is moved by the wire winch device 13. The work vehicle body 2 can be raised along the inclined surface by winding. When the lifting / lowering wire 14 is wound up by the wire winch device 13 so as to raise the work vehicle main body 2, the minute pulley mechanism 31 of the wound length is lowered, whereby the supporting wire 12 is wound up. The distance work vehicle main body can be raised twice as long. As long as the elevating wire 14 is not cut, the tension of the elevating wire 14 resists the urging force of the elastic body 45 and locks via the operating body 48 and the connecting wire 46 as shown in FIG. Since the piece 42 is continuously urged in the two directions, the work vehicle main body 2 can move up and down without the support wire 12 being held.

  Next, the operation of the fall prevention mechanism 41 will be described. FIG. 6 shows the fall prevention mechanism 41 in a state where the lifting wire 14 is cut. When the elevating wire 14 is broken, the tension of the elevating wire 14 is lost, and the force for urging the lock piece 42 in two directions via the operating body 48 and the connecting wire 46 is lost. As a result, an urging force that rotates the lock piece 42 of the elastic body 45 in the direction C acts, the lock piece 42 rotates in the direction C about the axis, and the holding curved surface 42A is fitted to the holding surface 43A. Then, the support wire 12 is held. In this way, when the lifting wire 14 is cut, the supporting wires 12 and 12 support the work vehicle main body 2 instantly and prevent the work vehicle main body 2 from falling down. it can.

  In the present embodiment, the lock piece 42 is composed of an eccentric cam. However, the lock piece 42 may be a slide piece that slides in the lateral direction and holds the support wire 12.

It is a top view of the working vehicle for steep slopes. It is a side view of a work vehicle main body. It is a top view of a wire winch apparatus. It is a top view of the state which wound up the wire for raising / lowering with the wire winch apparatus, and the work vehicle main body raised. It is a top view of the support body of the state which the wire for raising / lowering is not cut | disconnected, a moving pulley mechanism body, and a fall prevention mechanism. It is a top view of the support body of the state where the wire for raising / lowering was cut, the movable pulley mechanism, and the fall prevention mechanism.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Work vehicle for steep slope 2 Work vehicle main body 3 Lower traveling body 4 Movable support body 5 Hydraulic cylinder 6 Upper turning body 8 Work front 12 Support wire 13 Wire winch device 14 Lifting wire 21 Support body 31 Moving pulley mechanism body 32 Base 41 Fall prevention mechanism 42 Lock piece 45 Elastic body 48 Actuator

Claims (3)

  A lower traveling body, a movable support whose front end is pivotally supported by the lower traveling body, a hydraulic cylinder connected between the lower traveling body and the movable support, and moving the movable support up and down; and the movable support A work vehicle body is composed of an upper swing body mounted on the body and a work front provided on the upper swing body, and a movable pulley mechanism body is interposed between the support body installed above the slope and the lower traveling body. A pair of left and right support wires are stretched, and a lifting wire is stretched between the moving pulley mechanism and a wire winch device mounted on the lower traveling body, and the lifting pulley is mounted on the moving pulley mechanism. A work vehicle for steep slopes provided with a fall prevention mechanism for holding the support wire when the wire is disconnected.   The fall prevention mechanism is provided at a base of the movable pulley mechanism so as to be displaceable, and a lock piece capable of holding the support wire between the base and the tension between the lock piece and the base. And an elastic body that constantly applies a biasing force in the holding direction to the lock piece, and is connected between the lock piece and the lifting wire, and the lock piece is attached by tension acting on the lifting wire. 2. The steeply inclined work vehicle according to claim 1, further comprising an operating body that is held in a state of being separated from the support wire against an urging force of the elastic body.   The steeply inclined work vehicle according to claim 2, wherein the lock piece is an eccentric cam pivotally supported on the base.

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