JP2566667Y2 - Jib drive control - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a swivel base mounted on a vehicle which pivotally supports a telescopic boom so as to be able to move up and down.
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drive control device for a jib in a self-propelled crane having a telescopic jib attached to a tip end of a robot so as to be able to undulate.

[0002]

2. Description of the Related Art A jib mounted on a telescopic boom of a self-propelled crane so as to be able to move up and down is used to increase the working head and working radius of the self-propelled crane.

As shown in FIGS. 2 and 3, this type of jib B is supplementarily attached to a distal end of a telescopic boom 3 pivotally supported on a swivel 2 mounted on a vehicle 1 so as to be able to move up and down. The base jib section 4 includes a proximal jib section 4 and a distal jib section 5 which is inserted into the base jib section 4 so as to be stretchable. The distal end of the telescopic boom 3 (the lower end of the telescopic boom 3 in the embodiment of FIG. 2, the jib mounting base 6 'attached to the distal end of the telescopic boom 3 in the embodiment of FIG. 3). A jib main body 6 pivotally connected to the lower portion and an appropriate position of the proximal jib section 4 in the jib main body 6 (in the embodiment of FIG. 2, the rear side of the distal end of the proximal jib section 4, FIG. 3). In this embodiment, the rear side of the proximal end of the proximal jib section 4) and the distal end of the telescopic boom 3 Tokoro (stretch in the embodiment of FIG. 2 Bed - arm 3
3 (or the upper part of the jib mounting base 6 'in the embodiment of FIG. 3), and the jib body 6
And a double-acting up-and-down cylinder 7, which is interposed between the base-side jib section 4 and the distal-side jib section 5 of the jib body 6, and which expands and contracts to drive the jib body 6. And a cylinder 8.

The up-and-down cylinder 7 in the embodiment shown in FIGS. 2 and 3 is driven by reducing the height of the up-and-down cylinder 7 so that the jib main body 6 is moved to the distal end of the telescopic boom 3 (or the jib mounting base 6 '). It is configured to raise. This is to prevent the moment in the undulating direction acting on the jib body 6 from being held by the tensile force of the undulating cylinder 7 so that the buckling force does not act on the undulating cylinder 7. In the case where the jib main body 6 has a bending strength, the jib main body 6 may be raised by the extension driving of the undulating cylinder 7.

The jib B of this type controls the supply and discharge of pressurized oil to and from the up-and-down cylinder 7 and the telescopic cylinder 8 to move the jib body 6 up and down and extend and contract as follows. Is provided.

As shown in FIG. 4, a conventional jib drive control device is provided in an operator's cab 2a on a swivel 2 and is operated by an operating lever 9a to switch the jib up and down. A hydraulic switching valve 9 and a four-way three-position hydraulic switching valve 10 for extending and retracting the jib, which is switched by an operating lever 10a, are provided. The two oil chambers of the cylinder 7 are connected by two hydraulic hoses 9b and 9c, and a pair of control ports of the four-way three-position hydraulic switching valve 10 and two oil chambers of the telescopic cylinder 8 are connected by two hydraulic chambers. The two hydraulic hoses 10b and 10c are connected.

The relationship between the operating directions of the operating levers 9a and 10a and the up / down and extension / retraction driving directions of the jib body 6 is such that when the operating lever 9a is tilted forward, the up / down cylinder 7 is extended and the jib body 6 is moved. When the operating lever 10a is tilted forward, the telescopic cylinder 8 is extended and the jib body 6 is extended, and when the operating lever 9a is tilted backward, the undulating cylinder 7 is contracted. When the jib body 6 is raised and the operation lever 10a is tilted backward, the telescopic cylinder 8 is contracted and the jib body 6 is contracted. This operation direction is the same operation as the operation direction for raising and lowering the telescopic boom 3 and expanding and contracting, and has the effect of reducing erroneous operation of the operator.

[0008]

However, in the above-mentioned conventional jib drive control device, it is necessary to provide a four-way three-position hydraulic switching valve and two hydraulic hoses for each of the hoisting cylinder 7 and the telescopic cylinder 8. There was a problem that it was complicated and expensive. In particular, the hydraulic hose must be wound around a hose winder (not shown) in order to be able to expand and contract in conjunction with the expansion and contraction movement of the telescopic boom 3. Providing four hydraulic hoses for the sake of convenience has further increased the cost problem.

The present invention has been made in view of the above circumstances, and has one four-way three-position hydraulic switching valve, two hydraulic hoses, and a valve provided on the jib and operated remotely. The operating direction of the operating lever of the four-way three-position hydraulic switching valve is the same as the operating direction of the up-and-down movement of the telescopic boom and the operating direction of the telescopic boom, and there is little erroneous operation of the operator. It is an object to provide a drive control device for a jib.

[0010]

In order to achieve the above object, the present invention comprises the following effective problem solving means.

That is, the drive control apparatus for a jib of the present invention pivotally supports a telescopic boom so as to be able to move up and down on a swivel table mounted on a vehicle, and raises and lowers the jib at the tip end of the telescopic boom. What is claimed is: 1. A drive control device for a jib in a self-propelled crane which is freely mounted, comprising: a jib section at a base end side; A jib body pivotally connected to the base end of the base end side jib section so as to be able to move up and down freely to a distal end of the telescopic boom or to a jib mounting base attached to the distal end of the telescopic boom; A double-acting hoist cylinder interposed between a proper position of the proximal jib section of the jib body and a proper position of the distal end portion of the telescopic boom or a proper position of the jib mounting base, and driven to raise and lower the jib body by the expansion and contraction movement; Base side jibse on body And a double-acting telescopic cylinder interposed between the front and rear end jib sections to expand and contract the jib body by the expansion and contraction of the jib. A four-way three-position hydraulic switching valve to be switched, and a valve device mounted on the jib body or the jib mounting base and remotely controlled by an operation switch provided in the cab, The hydraulic cylinder is connected to a pair of control ports of the four-way three-position hydraulic switching valve via two hydraulic hoses which can be extended and retracted in conjunction with the expansion and contraction of the arm. A valve device connected to the oil chamber via an oil passage. The valve device supplies pressure oil to one of the two hydraulic hoses when the jib is raised. To the oil chamber of the undulating cylinder Both the other ho -
A first switching position in which the hose is connected to the oil chamber of the undulating cylinder on the side that supplies the pressurized oil when the jib falls down;
The second switch position is connected to the oil chamber on the extension side of the telescopic cylinder.

With this configuration, the driving direction of the up-and-down cylinder and the telescopic cylinder can be selected by switching one four-way three-position hydraulic switching valve provided in the cab. It is possible to select whether the cylinder to be driven is an up-and-down cylinder or a telescopic cylinder by a valve device remotely operated by an operation switch provided. Therefore, the tilting operation and the extension movement of the jib body can be performed by operating the operation lever by tilting the operation lever forward, and by operating the operation switch by tilting the operation lever backward. As the jib body can be raised and lowered,
It becomes the same as the operation direction of the up and down of the telescopic boom and the telescopic,
Erroneous operation of the operator is reduced.

Further, the hydraulic oil from a single four-way three-position hydraulic switching valve is attached to the jib through two hydraulic hoses which can expand and contract in conjunction with the expansion and contraction of the expansion and contraction boom. Since the two hydraulic hoses are configured to be selectively connected to the hoisting cylinder and the telescopic cylinder by the valve device, the number of four-way three-position hydraulic switching valves may be one, Further, since only two hydraulic hoses are required, the structure can be simplified and the cost can be reduced.

[0014]

As a result, according to the jib drive control device of the present invention, the number of four-way three-position hydraulic switching valves and the number of hydraulic hoses can be reduced to half that of the conventional one, and the structure is accordingly reduced. It can be simple and inexpensive. Also, the operating direction of the operating lever for switching the four-way three-position hydraulic switching valve is
Since the operation direction of the up-and-down operation of the telescopic boom and the telescopic operation is the same, the erroneous operation of the operator is reduced.

[0015]

FIG. 1 shows the configuration of a drive control device for a jib according to an embodiment of the present invention. Note that the jib drive control device according to the embodiment of the present invention is different from the above-described conventional jib drive control device only in the hydraulic control device portions of the up-and-down cylinder 7 and the telescopic cylinder 8; For the description of the configuration and operation, the description of the above-described conventional technique is referred to.

The switch 11 is operated by an operation lever 11a provided in the operator's cab 2a to control the connection between the pair of control ports and the pump oil passage 12 and the tank oil passage 13. It is a position hydraulic switching valve.

The four-way three-position hydraulic directional control valve 11 operates the operating lever 11a forward to move the pump oil passage 12 to the hydraulic hood.
And the tank oil passage 13 is connected to the hydraulic hose 11c.
And the operating lever 11a is tilted backward to connect the pump oil passage 12 to the hydraulic hose 11c and the tank oil passage 13c.
Is connected to the hydraulic hose 11b.

Numeral 14 designates a valve device mounted at an appropriate position on the proximal jib section 4. In this embodiment, the valve device 14 is provided.
Is composed of two electromagnetic switching type oil passage switching valves 14a and 14b, and each of the oil passage switching valves 14a and 14b is provided with a hydraulic hose 11 respectively.
b and the hydraulic hose 11c.

The oil passage switching valve 14a is located at the first switching position a when the solenoid 14a 'is de-energized. Oil passage 7 connected to oil chamber 7d on the extension side of
The hydraulic hose 11b is connected to the telescopic cylinder 8a when the solenoid 14a 'is switched to the second switching position b when energized.
The hydraulic hose is connected to the oil passage 8a connected to the oil chamber 8d on the extension side of
11a.

The oil passage switching valve 14b includes a solenoid 14
b ′ is located at the first switching position a when the power is not supplied, and the oil chamber of the undulating cylinder 7 on the side that supplies the pressure oil when the jib is raised.
That is, the hydraulic hose 11c is connected to the oil passage 7b connected to the oil chamber 7c on the reduction side of the undulating cylinder 7, and the solenoid 14
b 'is switched to the second switching position b when the power is supplied, and the hydraulic hose 11c is connected to the oil passage 8b connected to the oil chamber 8c on the reduction side of the telescopic cylinder 8.

The solenoid 14 of each of the oil passage switching valves 14a and 14b
Control of energization and non-energization of a 'and 14b' is configured to be performed by operating an operation switch 15 provided in the cab 2a of the swivel base 2. The connection between the operation switch 15 and the solenoids 14a 'and 14b' is made by an extendable wire (an electric wire which is wound around a cord winder so as to be freely retractable and interlocked with the telescopic boom 3). ).

In the drive control device for the jib of this embodiment,
With the above-described configuration, if the operation lever 11a is tilted forward while the operation switch 15 is turned off (the valve device 14 is located at the first switching position a), the up-and-down cylinder 7 is extended. When the jib B moves down and falls down, and the operation lever 11a is tilted backward, the up / down cylinder 7 is contracted and the jib B is raised.

If the operation lever 11a is tilted forward while the operation switch 15 is in contact (the valve device 14 is switched to the second switching position b), the telescopic cylinder 8 is extended. When the jib B is extended and the operation lever 11a is tilted backward, the telescopic cylinder 8 is contracted and the jib B is contracted.

For this reason, the operation direction of the operation lever 11a is as follows.
The driving direction of the up / down movement of the telescopic boom 3 with respect to the telescopic operation lever and the expansion / contraction is the same, so that the erroneous operation of the operator can be reduced.

In the above-described embodiment, the example in which the valve device 14 is attached to the jib section 4 on the proximal end side of the jib body 6 has been described. However, the jib body 6 is extended and retracted via the jib attachment base 6 '. 3 (shown in FIG. 3), of course, the valve device 14 may be mounted on the jib mounting base 6 '.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a jib drive control device of the present invention.

FIG. 2 is an explanatory view of a self-propelled crane provided with a jib.

FIG. 3 is an explanatory view illustrating another embodiment of a method of attaching a jib.

FIG. 4 is an explanatory diagram of a conventional jib drive control device.

[Explanation of symbols]

 Reference Signs List 1 vehicle 2 turntable 2a cab 3 telescopic boom 4 proximal jib section 5 distal jib section 6 jib body 6 'jib mounting base 7 undulating cylinder 8 telescopic cylinder 11 four-way three-position hydraulic switching valve 11a operation lever − 11b, 11c Hydraulic hose 14 Valve device 15 Operation switch

Claims (1)

(57) [Scope of request for utility model registration] A self-propelled crane having a telescopic boom pivotally supported on a turntable mounted on a vehicle so as to be able to move up and down, and an extensible jib is mounted at the tip of the telescopic boom so as to be able to move up and down. A drive control device for a jib in a vehicle, comprising: a jib section including a base-side jib section; and a distal-side jib section resiliently inserted into the base-side jib section. A jib body pivotally connected at its end to a distal end of the telescopic boom or to a jib mounting base attached to the distal end of the telescopic boom, and a proper jib section at the proximal end of the jib main body; And a double-acting undulating cylinder interposed between the right end of the telescopic boom and the right end of the jib mounting base to move the jib body up and down by the expansion and contraction movement, and the base end side jib section and the front end side of the jib body Interposition between jib sections And a double-acting telescopic cylinder that drives the jib body to expand and contract by its expansion and contraction movement, and is provided in the driver's cab on the swivel base and is operated by a tilting operation of an operation lever. A hydraulic switch valve, and a valve device mounted on the jib body or the jib mounting base and remotely controlled by an operation switch provided in the cab, which expands and contracts in conjunction with expansion and contraction of the expansion and contraction boom. It is connected to a pair of control ports of the four-way three-position hydraulic switching valve via two possible hydraulic hoses, and is connected to respective oil chambers of the hoisting cylinder and the telescopic cylinder via oil passages. And a valve device,
In the valve device, one of the two hydraulic hoses is connected to an oil chamber of a raising / lowering cylinder for supplying pressure oil when the jib is raised, and the other hose is connected to the jib. A first switching position connected to an oil chamber of an up-and-down cylinder on the side for supplying pressurized oil, and one of the hoses connected to an oil chamber on a reduced side of the telescopic cylinder and the other hose connected to the telescopic cylinder. And a second switching position connected to the oil chamber on the extension side of the jib.