JPH10236778A - Outrigger device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a turning base and an outrigger device from interfering with each other so as to improve safety by detecting the projecting quantity of a slide beam extensibly provided in the vehicle width direction of the outrigger device, and controlling the turning motion of the turning base based on the projecting quantity. SOLUTION: In this outrigger device 1 additionally provided on a crane truck or the like, under the condition in which the inner box 3B of the slide beam 3 is housed in the outer box 3A, limit switches 6, 6' are pressed so as to close the contacts. Hereby a solenoid type selector valve interposed on the hydraulic circuit of a turning drive part is on the position of unloading pressure oil to a tank, so as to obstruct turning motion of a turning base. Meanwhile, in the case of projecting the slide beam 3, when the inner box 3B is moved outside the vehicle body by a hydraulic cylinder, the contacts of the limit switches 6, 6' become in the open state, the solenoid type selector valve is changed over, and hence the turning motion of the turning base is allowed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an outrigger device, and more particularly, to a structure for preventing an outrigger device from interfering with a swiveling table that is pivoted.

[0002]

2. Description of the Related Art As is well known, an outrigger device is provided in a vehicle having a turnable device such as a crane mounted on a vehicle body to prevent the vehicle body from tipping over when the crane is extended to perform work. . The outrigger device is arranged before and after the center of gravity of the crane, and includes a slide beam that can be extended and retracted in the vehicle width direction and a jack cylinder that is provided to be able to move up and down at the tip of the slide beam. A grounding float is attached to the lower end of the jack cylinder.

For example, as an example of a mobile crane equipped with an outrigger device, as shown in FIG. 1 used for describing an embodiment of the present invention, a wheel made of a normal rubber tire so as to be able to start running is shown in FIG. Apart from that, it has wheels for rails. In such a crane truck, when the outrigger device is used, the ground surface on which the float is installed is considerably lower than the rail surface, so that the float is provided between the ground surface of the float at the lower end of the jack cylinder and the ground surface. The body of the crane truck is supported from the ground surface by the outrigger device by sandwiching the planks. However, if the number of planks sandwiched between the float and the ground surface is increased, it becomes unstable depending on the height of the planks, which is extremely dangerous. Work that is not related to the work using. Therefore, it is conceivable to increase the length of the jack cylinder so that the lifting stroke of the jack cylinder can be set large.

[0004]

However, when a jack cylinder having a longer length is employed, there are the following problems. That is, since the outrigger device is provided near the center of gravity of the crane, it is also provided near the turntable that affects the position of the center of gravity. For this reason, if the length of the jack cylinder provided in the outrigger device is long, a part of the jack cylinder may exist within the turning radius of the swivel base. There is a risk of interference with the cylinder. For this reason, the jack cylinder needs to be located outside the turning radius of the turning table. Since the jack cylinder is provided at the tip of the slide beam, as a result, the tip of the slide beam must be surely located outside the turning radius of the turntable. On the other hand, when performing a crane operation, as described above, it is premised that the slide beam extends outside the turning radius of the swivel base, so the extension stroke of the slide beam can be visually checked or measured by a stroke sensor or the like. Work to check with electrical components is required. However, such a checking operation may not always be accurate. That is, in the case of visual observation, the stroke may be mistaken or the visual confirmation may not be performed depending on circumstances. When a stroke sensor is used, the stroke at the time of extension of the slide beam can be tracked, but the sensor is expensive or does not match the actual extension stroke due to an error of the sensor itself. Data may be obtained. For this reason, actually, even when the tip of the slide beam is not located outside the turning radius of the turning table, the turning table is turned carelessly, and the jack cylinder and the turning table interfere with each other. Danger still exists.

SUMMARY OF THE INVENTION In view of the above-mentioned problems in the conventional outrigger device, an object of the present invention is to provide an outrigger having a structure that allows the swivel to turn only when the jack cylinder is located outside the turning radius of the swivel. It is to provide a device.

Another object of the present invention is to provide an outrigger device having a configuration capable of performing an operation for enabling a turn of a swivel table at low cost and without causing an error in view of the above-mentioned problems in the conventional outrigger device. To provide.

[0007]

In order to achieve this object, the invention according to claim 1 is provided near a swivel table which can be swiveled mounted on a vehicle body, and is provided so as to be extendable and contractible in the vehicle width direction. An outrigger device, comprising: a slide beam that is provided, and a jack that is provided so as to be able to move up and down at the tip of the slide beam. A restricting means for restricting the operation, and a signal for restricting the turning of the swivel base when the slide beam is not located outside the turning radius of the swivel base based on a detection result from the overhang amount detecting means. And a turning operation determining means for outputting to the restricting means.

According to a second aspect of the present invention, a slide beam is provided near a swivel table mounted on a vehicle body and capable of extending and contracting in the vehicle width direction. An outrigger device comprising: a jack provided so as to be able to be provided; a projecting amount detecting link mechanism operated by the slide beam itself in accordance with the projecting amount of the slide beam; and an oil passage for turning the swivel table. And a switching valve for regulating the swing drive and the swing drive of the swivel table, and the link mechanism for detecting the overhang amount is provided when the slide beam is positioned outside the swivel radius of the swivel table. The drive restricting switching valve is operated in a state in which the turn of the swivel table is driven.

[0009]

According to the first aspect of the present invention, the overhang amount of the slide beam is detected by the overhang amount detecting means, and the turning operation of the swivel base is controlled by the turning operation determining means based on the overhang amount. In particular, when the tip of the slide beam is not located outside the turning radius of the turntable, the turning operation is specified. Thereby, when the jack cylinder located at the tip of the slide beam is located within the turning radius of the turntable, it is possible to prevent a situation in which the turn operation of the turntable is performed carelessly.

According to the second aspect of the present invention, there is provided an overhang amount detecting link mechanism which is operated by the slide beam itself, and the overhang amount link mechanism is used to control the swiveling of the swivel table in accordance with the amount of overhang of the slide beam. The operation state of the switching valve is set. In particular, only when the slide beam is located outside the turning radius of the turntable, the position of the turning drive restricting switching valve is set to a position that allows the turn of the turntable. Thus, the overhang detection link mechanism can be directly operated by the slide beam itself,
The actual slide beam tip position can be accurately detected, and it is possible to prevent the swivel table from accidentally interfering with the jack cylinder located at the tip of the slide beam.

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 1 is a view showing an embodiment in which the outrigger device according to the first aspect of the present invention is applied to a mobile crane, (A) is a side view of the mobile crane, (B) is a rear view of the mobile crane, ( C) shows a plane respectively. In FIG. 1, the outrigger devices 1 are provided in pairs in the vehicle width direction in the vehicle longitudinal direction of the crane truck 2. The outrigger device 1 includes a pair of slide beams 3 having the same configuration that can expand and contract in the vehicle width direction, and a jack cylinder 4 that is attached to the tip of the slide beam 3 and that can move up and down. The slide beam 3 is extendable and contractable so that a retracted state and an extended state can be set in the vehicle width direction as shown by a solid line and a two-dot chain line in FIG. 1, and the jack cylinder 4 is As shown by a two-dot chain line, the storage device can be moved up and down so that the storage state and the ground state can be set. Among these members, the slide beam 3 has a structure described below, and can protrude in a relative direction along the vehicle width direction at a vehicle body front portion and a vehicle body rear portion.

FIGS. 2 and 3 are diagrams in which only the slide beam is extracted to explain the structure of the slide beam 3. FIG. 2 is a plan view of the slide beam 3, and FIG. It is. 2 and 3, one slide beam 3 is shown in an extended state for convenience of explanation. As shown in FIG. 2, the slide beam 3 is attached to the vehicle body so as to be adjacent to each other in the longitudinal direction of the vehicle body, and includes a slide beam outer box 3A and a slide beam inner box 3B. The outer slide beam box 3A is a portion attached to a vehicle body frame (not shown), and an end corresponding to one end in the extension direction and corresponding to the outside of the vehicle body is open. The slide beam inner box 3B
It is a member that can be slid by being inserted into the outer case 3A of the slide beam. In order to slide the inner box 3B of the slide beam, the inner box 3B of the slide beam and the outer box 3A of the slide beam are used.
The hydraulic cylinder 5 is disposed between the
Plunger 5A is connected to the inner box 3B of the slide beam.

On the other hand, the slide beam 3 is provided with a structure for restricting the turning operation of the turntable 50 (see FIG. 1) according to the amount of protrusion of the inner box 3B of the slide beam. FIG. 4 is a schematic view showing a configuration for restricting the turning operation of the above-mentioned swivel table. In FIG. 4, a slide beam is provided on a lower plate portion of a slide beam outer box 3A provided in an adjacent state. Limit switches 6 and 6 'are provided for switching the operation state in accordance with the overhang of the inner box 3B. In the figure, reference numeral 6 'denotes a limit switch, not shown, provided for the adjacent slide beam 3. The limit switches 6, 6 'make the actuator protrude into the slide path of the inner box 3B of the slide beam. Used. The projecting position of the actuator is, as shown by reference numeral P1 in FIG. 4, from the state in which the inner box 3B of the slide beam is stored, as shown by reference numeral P2 in FIG. When the overhang amount (L) of which the front end is located at the position (2) is obtained, the rear end of the inner box 2B of the slide beam comes off and the limit switch 6 is opened. Incidentally, since the turning radius of the turning table in this embodiment is set to 1600 mm, the slide beam inner box 3 is provided outside the turning radius.
When B protrudes, the limit switches 6, 6 'close the contacts and the energized state is set.

The above-mentioned limit switches 6 and 6 'are electrically connected to a turning operation determining means 7 which will be described later. FIG.
FIG. 3 is a circuit diagram for explaining the configuration of the turning operation determining means. In FIG. 3, the turning operation determining means 7 is connected to the contacts (R1, R2) of the limit switches 6, 6 'connected to the power supply line. The solenoid 8 is connected in series, and each contact constitutes an AND circuit for the solenoid 8. Therefore, when the limit switches 6 and 6 'are closed and the power supply state is set, a power supply electric path to the solenoid 8 is formed, and the solenoid 8 is excited.

The solenoid 8 is used as a drive source for switching the position of the direction switching valve 9 shown in FIG. As the direction switching valve 9, a two-position direction switching valve is used to regulate the swing drive and the swing drive of the swivel table, and the oil from the pump 10 is supplied to the hydraulic circuit of the swing drive unit 11 through the bias of the spring. A position for supplying / discharging (turning position), a position for turning the spool to the left position by energizing the solenoid 8 and unloading oil from the pump to the tank (turning restricting position). It is supposed to be.

Since the present embodiment has the above configuration,
In a state where the slide beam 3 stores the inner box 3B of the slide beam in the outer box 3A of the slide beam, the limit switches 6, 6 'are pressed by the inner box 3B of the slide beam as shown by a reference numeral P1 in FIG. Therefore, the contacts of the limit switches 6, 6 'are closed. Thereby, as described in FIG. 5, the solenoid 8 is excited, and the direction switching valve 9 moves the spool to the left position to unload the oil from the pump to the tank.
For this reason, since the oil of the pressure required for driving does not circulate in the turning drive unit 11, the turning table 50 (see FIG. 1) cannot be turned.

On the other hand, when extending the slide beam 3, the inner box 3B of the slide beam is moved toward the outside of the vehicle body by the hydraulic cylinder 5. When the limit switches 6 and 6 'are pressed in the process of moving the inner box 3B of the slide beam, the solenoid 8 is excited as in the case described above.
To maintain a state in which oil at the pressure required for driving does not circulate. When the slide beam inner box 3B is extended with the tip of the slide beam inner box 3B positioned outside the turning radius of the swivel table 50, the limit switches 6, 6 'are pressed by the slide beam inner box 3B. Will not be. As a result, the excitation of the solenoid 8 is released, and the direction switching valve 9 is switched to a state in which oil can be supplied / discharged to / from the drive control unit 11 through biasing by a spring.

According to the above-described embodiment, the fact that the tip of the inner slide beam box 3B is completely located outside the turning radius of the swivel table indicates that the moving inner slide beam box 3B.
Limit switch 6, which sets only the positional relationship to
6 ', it is possible to restrict the turning of the turntable 50 with a simple structure as compared with the case of detecting the sequentially changing overhang amount. In addition, since the limit switches 6, 6 'corresponding to the detection units are fixed to the outer side of the slide beam box 3A, they do not change the relative position with respect to the inner box 3B of the slide beam. Can be eliminated.

Next, an embodiment of the present invention will be described. FIG. 7 is a diagram showing an embodiment of the outrigger device according to the second aspect of the present invention. In the embodiment shown in FIG. 7, the detection of the amount of protrusion of the slide beam is performed according to the amount of protrusion of the slide beam. A feature is that an overhang amount detecting link mechanism operated by itself is provided, and the turning drive restricting switching valve can be operated by the overhang amount detecting link mechanism. In addition,
In FIG. 7, the same members among the constituent members shown in FIGS. 1 to 6 are denoted by the same reference numerals. In FIG. 7, levers 12 and 12 ', which are one of the components of the overhang amount detecting link mechanism, are provided below the slide beam outer box 3A. The levers 12, 12 'can be pivoted by a support shaft 14 mounted on the lower surface of the outer case 3A of the slide beam and supported by the bracket 13. Usually, as shown by a two-dot chain line in FIG. One end is urged by a spring 15 bridged between the shaft 14 and the immovable portion so that one end of the slide beam can project into the slide path of the inner box 3B of the slide beam with the support shaft 14 as a boundary. The bottom plate of the outer slide beam box 3A is provided with a long hole (a long hole indicated by a two-dot chain line in FIG. 7A) for allowing the levers 12 and 12 'to come out. The projecting positions of the levers 12 and 12 ′ are, as in the case of the limit switch in the above-described embodiment, the tip of the inner slide beam box 3 </ b> B
The levers 12 and 12 'are located at positions where the levers 12 and 12' can protrude into the sliding path of the inner slide beam box 3B when an overhang amount located outside the turning radius of (see FIG. 1) is obtained. For this reason, when the inner end of the slide beam inner box 3B is positioned within the turning radius of the turntable, the levers 12, 1
2 ′ is pressed by the lower surface of the inner box 3B of the slide beam,
It falls down against the habit of the spring 15 and retreats from the slideway of the inner box 3B of the slide beam.

One end of each of the rods 16 and 16 'is connected to an end of the lever 12 or 12' which extends on the side opposite to the slide beam inner box 3B with the support shaft 14 as a boundary. The rods 16 and 16 ′ are connected to a swing drive restricting switching valve 1 described later.
The other end is connected to a pivoting drive restricting switching valve 17 and a seesaw movable connecting rod 19 having a swing fulcrum shaft 18. The switching valve 17 having the pivot 18 for pivoting the connecting rod 19 is fixed by a bracket 20 provided on the lower surface of the outer case 3A of the slide beam, and has a two-position direction switching having the same configuration as the valve shown in FIG. A valve is used,
The connecting rod 19 is used as a drive mechanism of a spool inside the connecting rod instead of the solenoid shown in FIG. For this reason, the switching valve for turning drive restriction 1
7 has a swing fulcrum shaft 1 at a position facing the connecting rod 19.
8 are provided, and an actuator 17A for displacing the internal spool is projected,
A connecting rod 19 is attached to the actuator 17A so as to be eccentric from the pivot shaft 18. The turning drive restricting switching valve 17 is normally set in a position where oil can be supplied to and discharged from the turning drive unit of the turntable 50 by a spring provided therein.
This corresponds to the time when the levers 12, 12 'are exposed to the sliding path of the inner box 3B of the slide beam. And lever 1
When 2, 2 'is retracted from the sliding path of the inner box 3B of the slide beam, the connecting rod 19 swings according to the swing direction, so that the spool in the oil supply / discharge state moves. The oil from the pump is unloaded to the tank.

Since the present embodiment has the above configuration,
When the slide beam 3 is in the retracted state, the inner slide beam box 3B is inserted into the outer slide beam box 3A as in the above-described embodiment. In this case, lever 1
2, 12 'are pressed by the lower surface of the inner box 3B of the slide beam, and as shown by the solid line in FIG.
2, 12 'are retracted from the slideway of the inner box 3B of the slide beam against the behavior of the spring. Therefore, the turning drive restricting switching valve 17 switches the position of the spool to a state in which the oil from the pump is unloaded into the tank. As a result, the oil at the pressure required for the swing drive of the swing table is not circulated, so that the swing table 50 is maintained in a state in which the swing table cannot be swung. On the other hand, when projecting the slide beam 3, the slide beam inner box 3 </ b> B is moved toward the outside of the vehicle body by the hydraulic cylinder 5. Slide beam inner box 3
When the levers 12, 12 'are pressed by the inner box 3B during the movement process of B, the levers 12, 12' are moved to the inner box 3B as in the case of storage.
The switching valve 17 for turning drive regulation is moved by the connecting rod 19 because
7A is towed to position the spool so that oil from the pump is unloaded into the tank. As a result, the oil at the pressure necessary for driving is not circulated through the turning drive restricting switching position valve 17 to the turning drive unit.

When the slide beam inner box 3B protrudes with the tip of the slide beam inner box 3B positioned outside the turning radius of the swivel table, the levers 12, 12 'are pressed by the slide beam inner box 3B. Disappears. Accordingly, the levers 12 and 12 'can protrude into the sliding path of the inner box 3B of the slide beam by the bias of the spring 15, so that the connecting rod 19 is controlled to rotate by the rods 16 and 16'. The actuator 17A of the switching valve 17 is returned to the initial state. Thus, the hydraulic circuit of the turning drive unit is set in a state of circulating oil at a pressure necessary for the turning drive.

According to the above-described embodiment, only the operating force of the levers 12, 12 'and the connecting rod 19 is used as the position switching drive source of the switching valve 17 for restricting the turning drive. It becomes possible to make it cheaper than that. Moreover, the levers 12, 12 '
Is operated directly by the inner box 3B of the slide beam, so that the amount of protrusion of the inner box 3B of the slide beam can be detected without error.

[0024]

As described above, according to the first aspect of the present invention, the amount of overhang of the slide beam is detected by the overhang amount detecting means, and based on the amount of overhang, the turning operation determination means determines the turning of the turntable. The operation is controlled.
In particular, when the tip of the slide beam is not located outside the turning radius of the turntable, the turning operation is specified. As a result, when the jack cylinder located at the tip of the slide beam is located within the turning radius of the turntable, it is possible to reliably prevent a situation in which the turn operation of the turntable is performed carelessly. become.

According to the second aspect of the present invention, there is provided an overhang amount detecting link mechanism which is operated by the slide beam itself, and the overhang amount link mechanism drives the swivel base to swing and swing in accordance with the overhang amount of the slide beam. The operating state of the regulation switching valve is set. In particular, only when the slide beam is located outside the turning radius of the turntable, the position of the turning drive restriction switching valve is set to a position allowing the turn of the turntable. Thus, the overhang amount detecting link mechanism can be directly operated by the slide beam itself, so that the actual slide beam tip position can be accurately detected, and the swivel and the slide beam tip can be inadvertently detected. It is possible to reliably prevent interference with the jack cylinder located at a position with a low-cost structure.

[Brief description of the drawings]

FIG. 1 is a view showing a vehicle to which an embodiment of an outrigger device according to the first and second aspects of the invention is applied, (A) is a side surface of the vehicle, (B) is a rear surface of the vehicle, and (C) is a vehicle. Each plane is shown.

FIG. 2 is a plan view partially showing a cross section of a main part structure of the outrigger device according to the first embodiment of the present invention.

FIG. 3 is a side view partially showing a main part structure of the outrigger device according to the first embodiment of the present invention in a cross section.

FIG. 4 is a schematic diagram for explaining a part of a main structure of the outrigger device according to the first embodiment of the present invention;

FIG. 5 is a circuit diagram for explaining a configuration of a turning restriction determining unit using the members shown in FIG. 4;

FIG. 6 is a block diagram for explaining a structure of a direction switching valve which is an example of a restricting means used in the turning restriction determining means shown in FIG.

FIGS. 7A and 7B are diagrams showing a main part structure of the outrigger device according to the second aspect of the invention, wherein FIG. 7A is a plan view partially shown in cross section, and FIG. It is.

[Explanation of symbols]

DESCRIPTION OF REFERENCE NUMERALS 1 Outrigger device 3 Slide beam 3A Slide beam outer case 3B Slide beam inner case 4 Jack cylinder 6, 6 'Limit switch as overhang amount detecting means 7 Turning restriction judging means 8 Solenoid 9 Direction switching valve as restricting means 11 Turning driving unit 12, 12 'Lever which is a component of the overhang amount detecting link mechanism 17 Driving control switching valve 19 Connecting rod which is another component of the overhang amount detecting link mechanism 50 Swivel table

Continued on the front page (51) Int.Cl. ⁶ Identification code FI B66F 11/04 B66F 11/04

Claims (2)

[Claims] 1. A slide beam, which is located near a swiveling turntable mounted on a vehicle body and is provided so as to be extendable and contractible in the vehicle width direction, and is provided so as to be able to move up and down at the tip of the slide beam. An outrigger device comprising a jack, an overhang amount detecting unit that detects an overhang amount of the slide beam, a restricting unit that regulates a turning operation of the swivel base, and a detection result from the overhang amount detecting unit. Turning operation determining means for outputting to the restricting means a signal for restricting the turning of the swivel when the slide beam is not located outside the turning radius of the swivel. An outrigger device characterized by the above-mentioned. 2. A slide beam, which is located near a swiveling turntable mounted on a vehicle body and is provided so as to be extendable and contractible in the vehicle width direction, and is provided so as to be able to move up and down at the tip of the slide beam. An outrigger device comprising a jack and a link mechanism for detecting an overhang amount that is operated by the slide beam itself in accordance with an overhang amount of the slide beam, and provided in an oil passage for turning drive of the swivel base. A turning valve for turning the turntable and a switching valve for restricting the turn drive, wherein the overhang amount detecting link mechanism drives the turn of the turntable when the slide beam is located outside the turning radius of the turntable. An outrigger device characterized in that the drive restricting switching valve is operated in a state where the drive restriction is performed.