JP2014034213A - Jack up device for dump truck - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a novel jack up device for a dump truck capable of jacking up the dump truck with ease and at low cost.SOLUTION: The jack up device for a dump truck for jacking up a dump truck 100 in which a load-carrying platform 20 is freely raised up or laid down on a vehicle body frame 10 and the load-carrying platform 20 and the vehicle body frame are connected by an extensible hoist cylinder 30, comprises: a hoist-cylinder fastening base 60 for removing the end of the hoist cylinder 30 near the vehicle body frame 10 from the vehicle body frame 10 and supporting the cylinder from the ground; and fastening means 20 for fastening the load-carrying platform 20. This allows the dump truck 100 to be jacked up with ease and at low cost without equipping a crane or a large oil pressure sender unit.

Description

  The present invention relates to an apparatus for jacking up (lifting) a vehicle body when replacing components such as a dump truck tire and a reduction gear.

  2. Description of the Related Art Conventionally, dump trucks for transporting earth and sand are mounted with a cargo bed on the vehicle body, and a hydraulic cylinder called a hoist cylinder is connected between the cargo bed and the vehicle body, and the hydraulic cylinder is expanded and contracted to provide the cargo bed. The rocks are loaded and discharged by swinging up and down from the lying state to the standing state.

  Further, in Patent Document 1 below, a body lift device having a hydraulic cylinder on a base is prepared, and the body lift device lifts the loading platform on the vehicle body to an upright state and discharges the earth and sand, thereby discharging the sand on the vehicle body side. A dump truck that omits a hydraulic cylinder is disclosed.

JP-A-4-193655

  By the way, in order to replace tires and suspension parts of such conventional dump trucks, it is necessary to lift the vehicle body using a hydraulic jack or a mechanical jack-up device so that the tire floats from the ground. There is.

  However, in the case of an ultra-large machine with a body weight of 100 tons or more, such as a mining dump truck used for mine open-pit mining, etc., it is impossible with a normal jack-up device, so use a large crane. It is necessary to lift the vehicle body or use a dedicated large hydraulic jack. Therefore, each method requires a large hydraulic unit and preparation, and requires a lot of labor and cost.

  Therefore, the present invention has been devised to solve these problems, and an object of the present invention is to provide a new dump truck jack-up device that can jack up the dump truck easily and at low cost. .

  In order to solve the above-mentioned problems, the first invention is an apparatus for jacking up a dump truck in which a loading platform is provided on a body frame so that the loading platform can stand up and fall down, and the loading platform and the body frame are connected by a retractable hoist cylinder. The hoist cylinder includes: a hoist cylinder fixing base that removes the body frame side end of the hoist cylinder from the vehicle body frame and supports the hoist cylinder from the ground; and a fixing unit that fixes the cargo bed. This is a dump truck jack-up device.

  According to such a configuration, the vehicle body frame end portion of the hoist cylinder can be removed from the vehicle body frame and supported by the hoist cylinder fixing base in a state where the loading platform is fixed by the fixing means. When the hoist cylinder is extended from this state, the vehicle weight is applied to the hoist cylinder fixing base, and the vehicle body (tire) is lifted away from the ground. This makes it possible to jack up the dump truck easily and at low cost without preparing a crane or a large hydraulic unit.

  A second invention is the jackup device according to the first invention, wherein the fixing means fixes the loading platform to the vehicle body frame side in a state where the cargo bed is lying down. According to such a configuration, when the hoist cylinder is extended and the loading platform is raised, the vehicle body frame also rises immediately, so that the vehicle body can be reliably lifted with a minimum stroke.

  A third invention is the jack-up device according to the first or second invention, wherein the hoist cylinder fixing base includes a shaft support portion that pivotally supports the vehicle body frame side end portion of the hoist cylinder. . According to such a configuration, the hoist cylinder can be pivotally supported so as to connect the end portions on the vehicle body frame side, so that even if the hoist cylinder slightly swings around the pivotal support portion, there is no displacement or excessive force is applied. This can be reliably supported.

  4th invention is the jackup characterized by the said hoist cylinder fixed base having a bearing part which supports the said vehicle body frame side edge part of the said hoist cylinder so that rocking | fluctuation is possible in 1st or 2nd invention. Device. According to such a configuration, the body frame side end of the hoist cylinder can be swingably supported, so that even if the hoist cylinder swings slightly around its bearing portion, it is not displaced or excessive force is applied, This can be easily supported.

  ADVANTAGE OF THE INVENTION According to this invention, a vehicle body can be lifted using the hoist cylinder for raising a loading platform with which the existing dump truck is equipped. This makes it possible to jack up the dump truck easily and at low cost without preparing a crane or a large hydraulic unit.

1 is a general view showing an embodiment of a dump truck 100 according to the present invention (a state in which a loading platform 20 is laid down). 1 is a general view showing an embodiment of a dump truck 100 according to the present invention (a state in which a loading platform 20 is raised). It is the elements on larger scale which show the B section in FIG. It is the elements on larger scale which show the A section in FIG. FIG. 5 is a sectional view taken along line XX in FIG. 4. FIG. 5 is a sectional view taken along line XX in FIG. 4. FIG. 3A is a cross-sectional view taken along line XX. It is explanatory drawing which shows one Embodiment of the hoist cylinder fixed base. 3 is a conceptual diagram showing a state in which the lower end of the hoist cylinder 30 is indicated by a hoist cylinder fixing base 60. FIG. It is a conceptual diagram which shows the state which extended the hoist cylinder 30 from the state of FIG. 9, and jacked up the dump truck 100. FIG. It is explanatory drawing which shows other embodiment of the hoist cylinder fixed base. It is explanatory drawing which shows other embodiment of a fixing means.

  Next, embodiments of the present invention will be described with reference to the accompanying drawings. 1 and 2 are general views showing an embodiment of a dump truck 100 according to the present invention. As shown in the figure, the dump truck 100 is used for carrying earth and sand, for example, in an open pit operation of a mine, and has a vehicle weight of several tens tons to over 100 tons and a height of several m to 10 m. It is an ultra-large transport work machine. The dump truck 100 includes an engine compartment 12 and a cab 13 in front of the vehicle body frame 10 including the front wheels 11a and the rear wheels 11b, and a loading platform 20 at the rear upper part of the vehicle body frame 10. It has a structure.

  The engine room 12 includes a diesel engine and a generator (not shown). The engine is driven by the engine, and the electricity is controlled by a control device such as an inverter. Then, the front wheel 11a and the rear wheel 11b are connected by an AC motor. It is designed to drive. In addition, a hydraulic pump P is provided in the vehicle body frame 10, and pressure oil is sent to a hoist cylinder 30 for raising and lowering the loading platform 20 to expand and contract. The loading platform 20 is used for placing earth and sand, and the rear end side of the lower surface thereof is pivotally supported by a shaft support portion 21 provided at the upper rear end of the vehicle body frame 10 and the front end side of the lower surface is mounted on the vehicle body. It is supported on the frame 10 via support members 22a and 22b.

  The hoist cylinder 30 is composed of a large hydraulic cylinder composed of a cylinder body 31 and a cylinder rod 32 and having a load resistance of several tens of tons or more. The upper end side of the cylinder body 31 is pivotally supported on the lower surface of the loading platform 20. At the same time, the tip (lower end in the figure) side of the cylinder rod 32 is pivotally supported on the side surface of the lower body frame 10. The hoist cylinder 30 is expanded and contracted by the pressure oil from the hydraulic pump described above, so that the loading platform 20 can swing up and down from the lying state shown in FIG. 1 to the standing state shown in FIG. In the figure, the hoist cylinder 30 only on the front side (the left side in the traveling direction) of the vehicle body is shown, but this hoist cylinder 30 is also provided on the back side (the right side in the traveling direction) of the vehicle body. The hoist cylinders 30 and 30 are adapted to expand and contract in synchronization with each other.

  The lower end of the hoist cylinder 30 is detachable from the body frame 10 side. That is, as shown in FIGS. 4 to 6, an annular portion 32 a is integrally formed at the tip of the cylinder rod 32 of the hoist cylinder 30, and the annular portion 32 a is connected to the vehicle body frame 10 by the connecting pin 40. The shaft hole 14 is rotatably supported. A stopper 41 is detachably attached to the tip of the connecting pin 40 with a bolt 42. As shown in FIG. 6, the tip of the cylinder rod 32 is attached to the vehicle body by removing the stopper 41 and pulling out the connecting pin 40. It can be easily removed from the frame 10 side. In the figure, 15 is a bush for ensuring the slidability in the shaft hole 14, and 16 and 16 are thrusts for ensuring the slidability between the annular portion 32a and the connecting pin 40 and the vehicle body frame 10. It is a plate.

  Further, as shown in FIG. 3, fixing brackets 23 and 24 constituting a part of the jack-up device of the present invention are provided in the vicinity of the support members 22a and 22b provided on the body frame 10 and the lower surface of the loading platform 20, respectively. Each is provided. Like the support members 22a and 22b, the fixing brackets 23 and 24 are provided so as to be close to the body frame 10 and the lower surface of the cargo bed 20, respectively, and pin holes 23a and 24a are provided at the tips thereof. ing.

  The fixing brackets 23 and 24 are provided at positions shifted in the width direction of the vehicle body, and the pin holes 23a and 24a are coaxially overlapped with each other when the support members 22a and 22b are in contact with each other. It has become a relationship. When jacking up as will be described later, as shown in FIG. 7, the lock pins 50 are inserted into the respective pin holes 23a and 24a to connect them, and on the contrary, when the loading platform 20 is raised and during normal operation, The lock pin 50 is pulled out to release these connections.

  Further, as shown in FIG. 7, another fixing bracket 23 on the vehicle body frame 10 side is provided in the axial direction, and the lock pin 50 is a pin of each of the three fixing brackets 23, 23, 24. The holes 23a, 24a, and 23a are attached so as to penetrate at once. The stopper 51 is detachably attached to the tip of the lock pin 50 by a bolt 52 in the same manner as the connecting pin 40 described above. Further, as shown in FIG. 3 (B), among the pin holes 23a, 24a, the pin hole 24a of the fixing bracket 24 on the loading platform 20 side has a slightly large elongated shape extending in the vertical direction. The positional deviation between 23a and 24a can be allowed.

  Next, FIG. 8 shows an embodiment of a hoist cylinder fixing base 60 constituting another part of the jackup device of the present invention. As shown in the figure, the hoist cylinder fixing base 60 supports a bowl-shaped bearing portion 61 so as to be concentrated from the front, rear, left and right directions of the vehicle body by a plurality of leg portions 62 extending from a base portion 63 in contact with the ground. It has a structure.

  The bearing portion 61 has an inner diameter that is the same as or slightly larger than the outer diameter of the annular portion 32 a at the tip of the cylinder rod 32 of the hoist cylinder 30. Therefore, the annular portion 32a at the tip of the cylinder rod 32 can be supported so as to fit within the flange as shown in FIG. 5A, and the annular portion 32a is supported in the flange as shown in FIG. It can be rotated in the radial direction in a state where it is housed inside.

  Next, the operation of the jackup device of the present invention having such a configuration will be described. First, an operator who wants to jack up the dump truck 100 regulates the rotation of the front wheels 11a and the rear wheels 11b by applying a parking brake of the dump truck 100, and then, as shown in FIG. The sleeper 80 is bitten to prevent the body from moving freely.

  Thereafter, the hoist cylinder fixing base 60 is installed immediately below the hoist cylinder 30 of the dump truck 100. Since one hoist cylinder 30 is provided on each side of the vehicle body frame 10 as described above, another hoist cylinder fixing base 60 is also installed directly below the hoist cylinder 30 on the opposite side. In parallel with this operation, or before or after, the lock pin 50 is inserted into the fixing brackets 23 and 24 and fixed to the vehicle body frame 10 in a lying state so that the loading platform 20 does not stand up.

  Next, the connecting rod 40 at the tip of the cylinder rod 32 of each of the hoist cylinders 30 and 30 is removed, and the cylinder rod 32 of each hoist cylinder 30 and 30 is slowly extended with the tip of the cylinder rod 32 free. The annular portion 32a at the tip is placed on the bearing portion 61 of the hoist cylinder fixing base 60 located immediately below the annular portion 32a. At this time, since the bearing portion 61 has a bowl shape, the annular portion 32a can be easily set in the bearing portion 61 by simply lowering the annular portion 32a. Then, when the cylinder rod 32 is further slowly extended in such a state, as shown in FIG. 10, not only the loading platform 20 but also the frame 10 is slowly raised so that the rear wheel 11b is lifted away from the ground and jacked. Up is achieved.

  As described above, the jack-up device of the present invention can lift the vehicle body using the hoist cylinder 30 for raising the loading platform provided in the existing dump truck 100, so that it is not necessary to prepare a crane or a large hydraulic unit. The dump truck 100 can be jacked up easily and at low cost. Specifically, effects such as a reduction in labor costs for crane operators, a reduction in rental costs for jack pumps, and a reduction in man-hours related to jack-up preparation can be exhibited.

  Then, if the work such as tire replacement is completed with the jack up in this way, when the hoist cylinder 30 is slowly contracted, the vehicle body descends and the rear wheel 11b comes into contact with the ground and becomes stable. Thereafter, when the hoist cylinder 30 is further contracted and the annular portion 32a at the tip of the cylinder rod 32 comes to the position of the shaft hole 14 of the vehicle body frame 10, the connecting pin 40 is inserted into the annular portion 32a and the shaft hole 14 to The tip of the rod 32 is pivotally supported on the body frame 10. In parallel with or before or after this operation, the lock pin 50 inserted into the fixing brackets 23 and 24 is removed to release the loading platform 20 from being fixed. This makes it possible to return the dump truck 100 that has undergone tire replacement or the like to its original operating state in a short time.

  Next, FIGS. 11 and 12 show another embodiment of the present invention. First, in the example of FIG. 11, a shaft support portion 64 is provided instead of the bowl-shaped bearing portion 61 of the hoist cylinder fixing base 60 shown in FIG. 8, and the cylinder rod of the hoist cylinder 30 is provided by this shaft support portion 64. 32 is pivotably supported. That is, as shown in FIG. 11A, the shaft support 64 is provided with a bracket 64a projecting upward on a bowl-shaped bearing member 61a, and a pin hole 64b is drilled in the bracket 64a.

  Therefore, if the annular portion 32a at the tip of the cylinder rod 32 is placed on the bearing member 61a and is connected to the pin hole 64b by the connecting pin 65, the shaft support is provided so as to connect the lower end of the hoist cylinder 30. Therefore, there is no possibility that the hoist cylinder 30 is displaced from the hoist cylinder fixing base 60 or detached when jacking up.

  On the other hand, FIG. 12 shows a means for fixing the loading platform 20 in the vicinity of the shaft support portion 21 provided at the upper rear end of the body frame 10. That is, pin holes (not shown) are drilled in the bracket 71 provided on the loading platform 20 side and the bracket 72 on the vehicle body side, respectively, so that these pin holes coincide with each other when the loading platform 20 is lying down. And if the lock pin 70 is inserted in these pin holes and they are connected to each other, the load carrier 20 is fixed to the body frame 10 and its movement is restricted. Therefore, if the hoist cylinder 30 is extended in this state, it is shown in the figure. Thus, the vehicle body of the dump truck 100 can be jacked up easily.

  In the present embodiment, an example of an ultra-large dump truck used for mine open pit work or the like has been described. However, the jack-up device of the present invention includes a hoist cylinder 30 for raising and lowering the loading platform 20. Of course, it can be applied to a dump truck of several tons or more as it is. Further, in the present embodiment, an example of jacking up so that the rear wheel 11b side is floated is shown. It is also possible to jack up so that it floats.

  Moreover, if the jack 20 is fixed in a state where the loading platform 20 is fixed to the vehicle body frame 10 as in the present embodiment, the stroke of the hoist cylinder 30 can be kept small, but if the stroke of the hoist cylinder 30 is sufficient, It is also possible to jack up in a state where the loading platform 20 is raised and fixed.

DESCRIPTION OF SYMBOLS 100 ... Dump truck 10 ... Body frame 20 ... Loading platform 23, 24 ... Fixing bracket (fixing means)
DESCRIPTION OF SYMBOLS 30 ... Hoist cylinder 31 ... Cylinder main body 32 ... Cylinder rod 32a ... Annular part 40 ... Connection pin 50, 70 ... Lock pin (fixing means)
60 ... Hoist cylinder fixed base 61 ... Bearing 64 ... Shaft support 80 ... Sleeper

Claims (4)

A device that stands up on a body frame and is provided with a free fall, and a device for jacking up a dump truck in which the platform and the body frame are connected by a retractable hoist cylinder,
The hoist cylinder;
A hoist cylinder fixing base that removes the body frame side end of the hoist cylinder from the body frame and supports it from the ground;
A dump truck jack-up device comprising fixing means for fixing the loading platform. The jackup device according to claim 1, wherein
The jacking-up device according to claim 1, wherein the fixing means fixes the loading platform to the vehicle body frame side in a lying state. The jack-up device according to claim 1 or 2,
The jackup device according to claim 1, wherein the hoist cylinder fixing base includes a shaft support portion that pivotally supports the vehicle body frame side end portion of the hoist cylinder. The jack-up device according to claim 1 or 2,
The jackup device according to claim 1, wherein the hoist cylinder fixing base includes a bearing portion that swingably supports an end portion of the hoist cylinder on the vehicle body frame side.

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