EP1408162A1 - Jib assembly for a construction machine - Google Patents

Abstract

The telescopic mast comprises a principal mast (MP) in which an auxiliary mast (MA) slides controlled by an actuator. A jib (FL) with a section corresponding to the auxiliary mast slides in the auxiliary mast and is controlled by an actuator. A balancing pole (BA) with a smaller section than the auxiliary mast slides in the auxiliary mast and has its foot articulated to the jib head. A balancing actuator is supported in the jib. A tool holder head (TPO) is articulated to the balancing pole head and a balancing actuator controls the tipping of the tool holder relative to the balancing pole.

Description

The present invention relates to a mast for a site whose end receives a tool as well as hydraulic cylinders lifting and deploying the mast and pivoting the tool.

There are multiple realizations of equipped construction machinery a telescopic mast or an arm carrying a pendulum, and receiving at the end, a bucket or blade to carry out earthworks or a fork to lift and transport loads.

The present invention aims to develop such a mast to increase the possibilities and scope while reducing its size.

A. un mât télescopique de section polygonale ayant

• un mât principal,
• un mât auxiliaire coulissant en appui dans le mât principal,
• un vérin d'allongement (V-MA), commandant le mât auxiliaire,

B. une flèche (FL) de section correspondante à celle du mât auxiliaire ;

• logée en coulissement dans le mât auxiliaire,
• un vérin d'allongement de flèche,

C. un balancier

• de section inférieure à celle du mât auxiliaire pour coulisser dans le mât auxiliaire,
• dont le pied est articulé à la tête de la flèche,
• un vérin de balancier, appuyé dans la flèche ;

D. une tête porte-outil,

• articulée à la tête du balancier,
• un vérin de cavage pour commander le basculement du porte-outil, par rapport au balancier.

To this end, the invention relates to a mast of the type defined above, characterized in that it comprises

A. a telescopic mast of polygonal section having

• a main mast,
• an auxiliary mast sliding in support in the main mast,
• an extension cylinder (V-MA), controlling the auxiliary mast,

B. an arrow (FL) with a section corresponding to that of the auxiliary mast;

• slidingly housed in the auxiliary mast,
• a boom extension cylinder,

C. a pendulum

• of smaller section than that of the auxiliary mast to slide in the auxiliary mast,
• whose foot is articulated to the head of the arrow,
• a pendulum cylinder, supported in the arrow;

D. a tool head,

• articulated at the head of the pendulum,
• a jacking cylinder for controlling the tilting of the tool holder, relative to the balance.

This combined mast which gathers practically in the length telescopic mast, i.e. the main mast, can be deployed telescopically not only for parts of the telescopic mast that is to say the main mast and the auxiliary mast but also for the length partly of the boom and of the pendulum.

This allows lifting operations, of large reach. When the auxiliary mast is engaged in the main mast but the boom and the pendulum are out, this allows you to work as an excavator or machine of this type.

When the auxiliary mast is engaged in the main mast and that the boom and the pendulum are engaged in the auxiliary mast, the mast thus grouped, can receive a blade allowing earthworks or bulldozer clearing.

Many other functions are possible for a construction machine equipped with such a combined mast and receiving the appropriate tools on its tool holder head.

According to another advantageous characteristic, the jack mast extension is mounted on top of main mast and mast auxiliary, avoids cluttering the interior of the telescopic assembly and leaves more room for other elements such as the arrow and the pendulum with the actuators which actuate them. Thus the boom extension cylinder is connected by its head at the head of the arrow and by its foot at the foot of the auxiliary mast. Its arrangement of cylinders not only makes it easier to group the assembly but also to protect these jacks in certain conditions of use of the mast, in particular when the mast is fitted a bucket or blade for clearing work.

According to another advantageous characteristic, the cylinder pendulum connected by its head to the foot of the pendulum at a point different from the articulation of the pendulum to the arrow.

According to another advantageous characteristic the tool holder head is connected to the balance head by a first articulation and a hinge compass with two connecting rods, one of which is connected to a second articulation of the tool head and the other connecting rod is connected to the balance between his head and his foot, a free joint connecting the two connecting rods top of the compass, this articulation being connected to the head of the tilt cylinder. According to another advantageous characteristic, the main mast is fitted with sliding plates at the top and bottom inside, at its end close to the head, the auxiliary mast is fitted with sliding plates partly high and low, outside, near its foot, the mast auxiliary leaning against the sliding plates of the main mast by its outer surface and by its sliding plates, against the surface interior of the main mast.

The sliding plates interposed between the main mast and the auxiliary mast facilitate the telescopic movements of the auxiliary mast, even when the assembly is heavily stressed by a load or by the efforts to be made for the execution of an operation.

For the same reasons it is advantageous that the masts auxiliaries have near the head and externally, a reinforcement in form of belt carrying the yoke to which the head is connected extension of the mast. This yoke allows the efforts to be transmitted even important to the auxiliary mast which also has the advantage of being pulled by the jack elongation, taking support at the front end of the mast auxiliary. As on the other hand, this extension cylinder is located at outside and protected on top of the main mast and auxiliary mast, it can be a very long cylinder, using the entire length available from main mast and auxiliary mast.

As the mast extension cylinder is located at outside, the bottom of the main mast and especially that of the auxiliary mast can be closed with a reinforcing plate.

Finally it is particularly advantageous that the main mast and the auxiliary mast are of rectangular section. This form corresponds to a simple realization of the masts while offering good surfaces of support distributing the efforts.

According to another advantageous characteristic, the arrow is a box of rectangular section, smaller than that of the auxiliary mast to slide into it, the bottom side and the top side of the arrow with sliding plates and internally the structure is provided with reinforcements transversely carrying the axis of the foot of the balance cylinder.

According to another advantageous characteristic the pendulum has a mechanically welded structure, connected by its foot to the articulation axis of the pendulum and at the same time serving as a fixing pin for the cylinder head boom extension.

According to another advantageous characteristic the pendulum has a split axis at its foot, and the tilt cylinder is split as well as the compass to receive a double digging cylinder.

drawings

• la figure 1 est une vue en coupe d'un mât combiné selon l'invention, les différents éléments étant rétractés,
• la figure 2 est une vue de dessous du mât combiné de la figure 1, montrant également le plan de coupe I I,
• la figure 3 est une vue de face, éclatée des différents éléments constitutifs du mât combiné de la figure 1,
• la figure 4 est une vue éclatée en perspective du mât combiné de la figure 1,
• la figure 5 est une vue en perspective de dessous du mât principal,
• la figure 6 est une vue de dessous du mât auxiliaire,
• la figure 6A est une coupe selon un plan médian (6-6) du mât auxiliaire de la figure 6,
• la figure 7 est une vue en perspective de dessous de la flèche du mât de la figure 1,
• la figure 8 est une vue de côté du mât combiné rentré, avec une flèche rentrée et un balancier en position allongée,
• la figure 9 est une vue de côté du mât combiné avec le mât auxiliaire rentré, la flèche sortie et le balancier en position allongée,
• la figure 10 est une vue de côté du mât combiné avec le mât auxiliaire sorti, la flèche sortie et le balancier en position allongée,
• la figure 10A est une vue en coupe selon un plan médian du mât combiné dans la position de la figure 10,
• la figure 11 est une vue de côté du mât combiné à mât auxiliaire rentré, flèche sortie et balancier en position intermédiaire,
• la figure 11A est une vue en coupe du mât combiné dans la position de la figure 11,
• la figure 12 est une vue de côté du mât combiné dont le mât auxiliaire est rentré, la flèche sortie et le balancier en position repliée,
• la figure 12A est une vue en coupe par un plan médian du mât combiné de la figure 12,
• la figure 13 est une vue de côté du mât combiné, le mât auxiliaire étant sorti, la flèche étant sortie et le balancier en position intermédiaire,
• la figure 13A est une vue en coupe correspondant à la figure 13,
• la figure 14 est une vue de côté du mât combiné avec le mât auxiliaire sorti, la flèche sortie et le balancier en position repliée,
• la figure 14A est une vue en coupe par un plan médian du mât dans la position de la figure 14,
• la figure 15 est une vue décalée du mât combiné avec le mât auxiliaire sorti et la flèche et le balancier rentrés,
• la figure 15A est une vue en coupe par un plan médian de la figure 15.

The present invention will be described below in more detail using an embodiment shown diagrammatically in the accompanying drawings in which:

• FIG. 1 is a sectional view of a combined mast according to the invention, the various elements being retracted,
• FIG. 2 is a bottom view of the combined mast of FIG. 1, also showing the section plane II,
• FIG. 3 is a front view, exploded of the various components of the combined mast of FIG. 1,
• FIG. 4 is an exploded perspective view of the combined mast of FIG. 1,
• FIG. 5 is a perspective view from below of the main mast,
• FIG. 6 is a bottom view of the auxiliary mast,
• FIG. 6A is a section along a median plane (6-6) of the auxiliary mast of FIG. 6,
• FIG. 7 is a perspective view from below of the boom of the mast of FIG. 1,
• FIG. 8 is a side view of the retracted combined mast, with a retracted boom and a pendulum in the extended position,
• FIG. 9 is a side view of the mast combined with the auxiliary mast retracted, the boom extended and the balance in the extended position,
• FIG. 10 is a side view of the mast combined with the auxiliary mast extended, the boom extended and the balance in the extended position,
• FIG. 10A is a sectional view along a median plane of the combined mast in the position of FIG. 10,
• FIG. 11 is a side view of the combined mast with the auxiliary mast retracted, the boom extended and the balance in the intermediate position,
• FIG. 11A is a sectional view of the combined mast in the position of FIG. 11,
• FIG. 12 is a side view of the combined mast, the auxiliary mast of which is retracted, the boom extended and the balance in the folded position,
• FIG. 12A is a sectional view through a median plane of the combined mast of FIG. 12,
• FIG. 13 is a side view of the combined mast, the auxiliary mast being extended, the boom being extended and the balance in the intermediate position,
• FIG. 13A is a sectional view corresponding to FIG. 13,
• FIG. 14 is a side view of the mast combined with the auxiliary mast extended, the boom extended and the balance in the folded position,
• FIG. 14A is a sectional view through a median plane of the mast in the position of FIG. 14,
• FIG. 15 is an offset view of the mast combined with the auxiliary mast extended and the boom and balance retracted,
• FIG. 15A is a sectional view through a median plane of FIG. 15.

Description of a preferred embodiment

The structure of the combined mast will be described below using Figures 1 - 7 and the different possibilities of extension and movement of the combined mast will be described using Figures 8 - 15.

According to Figures 1 to 7, the invention relates to a combined mast for a construction machine not shown. This mast is pivotally mounted on a support carried by the machine to tilt about an axis normally horizontal. The tilting is controlled by a jack.

According to the invention, the combined mast comprises a telescopic mast formed by a main mast MP and an auxiliary mast MA, a FL arrow, BA balance and TPO tool head.

The telescopic mast is formed by a main mast MP provided an articulation yoke 1 for the axis carried by the machine and a yoke 2 for the cylinder head controlling the pivoting of the combined mast. This mast main MP of polygonal section, here of rectangular section, receives a auxiliary mast MA of section corresponding to that of the main mast MP and sliding therein telescopically. The mast movement auxiliary MA relative to the main mast MP is controlled by a jack auxiliary mast V-MA formed by a tube 3, the foot 4 of which is connected to a clevis 5 carried by the top of the main mast MP, for example by through a reinforcing strip 6, projecting from the sides. The V-MA cylinder also includes a piston and its rod 7, the head (head of cylinder) 8 is connected to a yoke 9 carried by the front end of the telescopic mast MY. This yoke 9 is connected to a belt 10 so surrounding peripheral the MA telescopic mast at its end before.

The bottom 11 of the main mast MP is closed by a plate of reinforcement, welded, provided with holes for the passage of the fluid supplying the cylinders housed inside the combined mast.

The bottom 12 of the auxiliary mast MA is also closed by a reinforcement plate, welded, provided with holes for passage of the conduits feeding the cylinders housed inside the combined mast.

At its front end 13, on the inside lower and inner upper face of the main mast MP we fixed sliding plates 14, 15. Conversely, the telescopic mast MA has at the level of its rear part, on the lower face and the upper face, outside, a sliding plate 16 and 17; when the auxiliary mast MA is engaged in the main mast MP, the surfaces of sliding 16, 17 of the foot of the auxiliary mast MA sliding against the faces upper and lower internals of the main mast MP and likewise the part of the auxiliary mast MA, before leaving the front end 13 of the mast main MP, slides on the sliding plates 14, 15.

The length along the axis is reduced to a minimum, plates sliding 14, 15 of the primary mast MP and those 16, 17 of the mast MA auxiliary because they meet at the end of the telescopic deployment stroke of the auxiliary mast and thus define the maximum extension of the assembly constituted by the two masts MP, MA.

The arrow FL has a section corresponding to that of the mast auxiliary MA, that is to say a rectangular section. The arrow FL is intended to slide in the auxiliary mast MA with the pendulum BA.

The arrow FL (Figure 7) is a box construction of rectangular section, the front end of which ends on two sides triangular, carrying the axis 20 of the pendulum. At this level the ends of the boom are provided with side reinforcements 21. The underside and the upper face 22, 23 of the box of the arrow FL are provided sliding plates 24, 25 on their outer faces. These plates slide occupy the entire surface of the upper face 23 of the box and a corresponding surface of the underside 22. These plates of slip can have as large an area because the inner surface of the MA telescopic mast is free.

The arrow FL is provided with a reinforcing partition 26, horizontal, extending over a large part of the length of the boom, a certain distance above the bottom to end with a part at an angle 27 joining the nose of the arrow, behind the part carrying the axis 20 balance wheel.

It is also provided inside the boom box FL, two reinforcements 28, 29 carrying the axis 30 for the jack V-BA of the balance wheel.

The telescopic movement of the arrow FL relative to the MA telescopic mast is controlled by a boom extension cylinder V-FL whose tube 31 is housed in the MA telescopic mast near its lower side, the foot of the tube 31 being articulated near the bottom 12 of the mast telescopic MA. The piston with the rod 32 are carried by the arrow, the end of the rod, that is to say the cylinder head being articulated around axis 20 of the pendulum. The rod 32 and the tube 31 of the V-FL cylinder are located close enough to the bottom of the auxiliary mast MA and the boom FL to come under the interior reinforcement partition 26.

The space above this partition 26 is reserved for the jack of the V-BA balance and the movements it must carry out. As these movements are an extension combined with a pivot it is preferable that the internal reinforcement wall 26 is as close as possible from the bottom of the arrow FL.

The arrow FL carries the pendulum BA articulated around the axis 20. The balance consists of an elongated box 40, of very small section to the interior section of the MA auxiliary mast. This box substantially L-shaped, has a main branch directed from front to back terminated by a transverse branch 41. These two branches 40, 41 leave the hinge pin 20. The branch 40 is connected at its end front by an axis 42 to the tool holder head TPO and the branch 41 is connected by its end other than that of the axis 20, by a hinge 43 at the head of the V-BA balance cylinder, the foot of the V-BA cylinder being carried by the axis 30 of the easel formed by the plates 28, 29 of the arrow FL.

At branch 41 there is also an axis hinge 44 for the foot of the V-TPO tilt cylinder connected to the head TPO tool holder via a double compass formed by two connecting rods 51, 52, the apex 53 of which is articulated at the head of the tilt cylinder V-OPT. The other end of the first connecting rod 51 is articulated to the pendulum around an axis 54 located between the axis 43 of the TPO tool head and the axis hinge 20 of the pendulum on the arrow FL. The other connecting rod 52 is articulated by an axis 55 at the TPO head. The double compass 51, 52 is formed of two sets of connecting rods 51, 52 placed on each side of the box 40 of the BA pendulum, crossed by axis 54. Advantageously, the tilt cylinder V-TPO is split.

The combined mast described above works under the conditions following, which will be described using different end positions limit positions shown in Figures 8 to 15. In these figures, only the main elements are provided with references for the description of operation.

Thus according to FIG. 8, the combined mast is in its position the most folded. The auxiliary mast is fully engaged in the mast main, the V-MA mast extension cylinder being retracted. FL arrow is itself retracted into the auxiliary mast and the balance is in position elongated, almost completely retracted into the auxiliary mast at the following the arrow FL.

Figure 8 shows a position of the elements of the combined mast to which we arrive after deployment of the boom and pendulum: the auxiliary mast MA has always returned to the main mast MP but the arrow FL was taken out by the cylinder V-FL and the BA balance is still in the alignment of the arrow FL.

Figure 10 shows a position that can be reached at from the position of figure 9. In this position the auxiliary mast MA is out, the arrow FL is out and the pendulum BA is in the extended position. The transition from the position of Figure 9 to that of Figure 10 is done by deployment of the V-MA mast extension cylinder, the other elements of the combined mast having kept the position they had in Figure 9.

FIG. 10A shows in section the auxiliary mast MA, the arrow FL and BA pendulum. This figure shows the deployment of the cylinder mast extension V-MA and the boom extension cylinder V-FL. These two cylinders are deployed while the V-BA balance cylinder is in retracted position as well as the V-TPO tilt cylinder.

Figure 11 shows a different position than that of Figure 10 but which is obtained from the position of FIG. 9. In this position in FIG. 11, the auxiliary mast MA is retracted, the arrow FL is extended and the BA balance is in an intermediate position, tilted around its axis of articulation 20 with the arrow FL by the control of the V-BA balance cylinder. The tilt cylinder has not changed.

Figure 11A shows the arrangement of parts according to the figure 11, in section.

Figure 12 shows a position obtained from that in Figure 11: the BA balance has been put into the folded position by the control of the V-BA balance cylinder. The other elements of the combined mast have retained their position.

Figure 12A shows in section the arrangement of the different elements constituting the combined mast, for the position shown in the figure 12.

Figure 13 shows a position that can be reached at from the position of figure 11 but after deployment of the jack extension of the V-MA mast, the other elements having retained their position.

Figure 13A shows in section the position of the parts of the mast according to figure 13.

Figure 14 shows the pendulum more folded in relation to the position of Figure 13. The mast is deployed, the auxiliary mast MA being got out ; the arrow FL is out and the pendulum BA is in the folded position.

Figure 14A is a sectional view showing the arrangement parts according to figure 14.

Figure 15 is a sectional view showing the position retraction of the boom FL and of the pendulum BA but after deployment of the mast auxiliary MA with respect to the main mast MP by the extension cylinder of the V-MA mast.

The different cylinders of the combined mast are powered by hydraulic circuits connected to a command control managing the operation according to the possibilities of the tool installed at the end combined mast and authorized movements of the different components of the combined mast. Prohibitions include, for example, the prohibition of the V-TPO tilt cylinder when the balance is still engaged in the MA auxiliary mast.

This management of the functions of the combined mast also account of mast lifting movements and pivoting of the mast around of a vertical axis.

Claims (12)

Mast for a construction machine whose end receives a tool as well as hydraulic cylinders for lifting and deploying the mast and pivoting the tool,
characterized in that
He understands A. a telescopic mast of polygonal section having a main mast (MP), an auxiliary mast (MA) sliding in abutment in the main mast (MP), an extension cylinder (V-MA), controlling the auxiliary mast (MA); B. an arrow (FL) with a section corresponding to that of the auxiliary mast (MA), slidingly housed in the auxiliary mast (MA), a boom extension cylinder (V-FL); C. a pendulum (BA) of smaller cross-section than that of the auxiliary mast (MA) to slide in the auxiliary mast (MA), whose foot is articulated to the head of the arrow (FL), a pendulum cylinder (V-BA), supported in the arrow; D. a tool holder head (TPO) articulated at the head of the pendulum (BA), a tilt cylinder (V-TPO) to control the tilting of the tool holder, relative to the balance (BA). Combined mast according to claim 1,
characterized in that
the mast extension cylinder (V-MA) is mounted on top of the main mast (MP) and the auxiliary mast (MA). Combined mast according to claim 1,
characterized in that
the boom extension cylinder (V-FL) is connected by its head to the boom head (FL) and by its foot to the foot of the auxiliary mast (MA). Combined mast according to claim 1,
characterized in that
the balance cylinder (V-BA) is connected, by its head, to the foot of the balance (BA) at a point different from the articulation of the balance (BA) to the arrow (FL). Combined mast according to claim 1,
characterized in that
the tool holder head (TPO) is connected to the balance head (BA) by a first articulation and an articulation compass with two connecting rods (51, 52), one of which is connected to a second articulation (55) of the tool-holder head (TPO) and the other connecting rod (51) is connected (54) to the pendulum (BA) between its head and its foot, a free articulation (53) connecting the two connecting rods (51, 52) at the top of the compass, this articulation being connected (53) to the head of the tilt cylinder (V-TPO). Combined mast according to claim 1,
characterized in that
the main mast (MP) is fitted with sliding plates at the top and bottom inside (15, 16), at its end (13) near the head,
the auxiliary mast (MA) is provided with sliding plates in the upper and lower part, outside (16, 17), near its foot,
the auxiliary mast (MA) pressing against the sliding plates of the main mast (MP) by its outer surface and by its sliding plates, against the inner surface of the main mast (MP). Combined mast according to claim 1,
characterized in that
the auxiliary mast (MA) comprises near the head and externally a belt-shaped reinforcement (10) carrying a yoke (9) for the head of the mast extension cylinder (V-MA). Combined mast according to claim 1,
characterized in that
the main mast (MP) and / or the auxiliary mast (MA) have a bottom on the side of their foot which is closed by a reinforcing plate (11, 15). Combined mast according to claim 1,
characterized in that
the main mast (MP) and the auxiliary mast (MA) have a rectangular section. Combined mast according to claim 1,
characterized in that
the boom (FL) is a box of rectangular cross section, lower than that of the auxiliary mast (MA) for sliding in it, the lower side (22) and the upper side (23) of the boom having sliding plates ( 24, 25) and internally the structure is provided with reinforcements transversely carrying the axis (30) of the foot of the balance cylinder (V-BA). Combined mast according to claim 1,
characterized in that
the pendulum (BA) has a mechanically welded structure, connected by its foot to the articulation axis of the pendulum (BA) and at the same time serving as a fixing axis for the head of the boom extension cylinder ( V-FL). Combined mast according to claim 11,
characterized in that
the balance (BA) has a split axis at its foot, and the digging cylinder (V-TPO) is split as well as the compass (51, 52) to receive a double digging cylinder (V-TPO).

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