ES2586597T3 - Saw machine arm for sawing ornamental stones - Google Patents

Abstract

Arm, preferably orientable, of a sawing machine with cutting chain (103) to preferably cut ornamental stones in quarries, to execute, for example, horizontal and / or vertical cuts, comprising a main body (1), at least one drive pinion (100) of the chain connectable by means of a support to the saw machine, at least one small freewheel (102), preferably located at a free end (101) of the saw arm of the sawmill, in the that along the outer peripheral edge of the main body (1) of the arm of the sawing machine, on both sides of this elongated flat arm, respective lateral guides (104) of modular type are provided, comprising a plurality of pieces of lateral guide mounted on the main body (1) of the arm of the sawing machine detachably and side-by-side, preferably contiguous at the ends, characterized in that said lateral guide parts determine, during the assembly on the arm of the sawing machine, a contact overlapping zone (A - B) at its ends and between each pair of adjacent side guide pieces, and said area prevents a lubricating means from leaving between the flanked ends of the pieces, and because the thickness of the lateral guide (104) does not increase due to these overlaps but rather remains substantially constant.

Description

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DESCRIPTION

Arm of a sawing machine for sawing ornamental stones Field of technique

The present invention relates to a sawing machine for ornamental stones such as those used in quarries to make horizontal, vertical cuts, etc. More particularly, the invention relates to an adjustable arm of a sawing machine according to the preamble of claim 1, around which the cutting chain rotates, comprising links, inserts, insert carriers, etc.

Even more specifically, the present invention relates to side grains of the saw chain of the sawing machine, which comprise a plurality of separate pieces or modules.

Prior art

Such an arm is known from FR 2 496 544 A1.

The known side grids of the chain saw cutting chains comprise various replaceable parts mounted on both sides of the arm body, along the edges of the latter. This is due to the fact that a deformation or breakage on one side of the side grid otherwise required the replacement of the complete grid (loss of time, waste of material, etc.). The cutting chain therefore slides, actuated by the drive pin located at the proximal end of the arm of the sawing machine, between said side grids and at the horizontal base of the crane, where there are various parts subject to wear, they are also the same removable / replaceable but not part of the present invention.

The parts of the side grains mentioned above are mounted by means of suitable fixing means to the edge of the main body of the arm. Normally, the fixing means are screws that are screwed into the threaded holes arranged along the edge of the arm of the sawing machine. The pieces of the lateral grnas do not overlap each other; at most, they are coupled, leading to a butt joint.

Since the parts of the side grains constitute fungible materials, it is not convenient to take the manufacturing to a level of extreme precision (the parts wear out by friction and must be replaced repeatedly). Therefore, there are almost always small air spaces between the pieces (and their gaskets), where considerable amounts of chain lubricant grease come out.

Although respectful with the environment, the grease dispersed in the environment, through such air spaces or interstices between the pieces, creates problems from the economic point of view. Less grease in the circuit leads to greater chain wear, lower efficiency, etc.

An object of the present invention is to reach an adjustable arm (for sawing machines with a cutting chain) equipped with a modular side grinder to prevent the outflow of grease between the various parts or modules of the side grind.

Another object of the present invention is to keep assembly costs substantially unchanged with respect to parts, fixing means (screws) and assembly technique. The only variation lies in the shape of the pieces, which however can continue to be machined without excess precision.

Brief Description of the Invention

The present invention is defined by the features of independent claim 1. Further preferred embodiments are defined by the features of dependent claims 2-9.

In practice, also using the same fungible material and the same assembly technique, for example screws (their number is variable, for example depending on the length of the piece), entails an overlap at the ends of the different pieces, in board; such overlapping does not oblige the producer of such parts (of the side grille) to comply with extremely precise tolerances. On the contrary, the overlap can be verified, within certain limits; In other words, there may be a certain "slack" within which the overlap guarantees a good seal for the lubricating grease.

The preferred embodiment of the parts of the side grille consists of plates whose ends have stepped surfaces or even better, surfaces separated by a step, in which the surface associated with a reduced thickness of the plate / piece comes into contact (in the position of assembly) with the corresponding surface (associated with a reduced thickness) of the adjacent plate / piece.

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It is important to observe two things: 1) The portions of reduced thickness that overlap each other in the joints are not affected by the fixing screws and remain free to create a "flat surface" contact with a certain pressure force which reliably prevents the passage of lubricating grease out of the gma. 2) The total thickness of each lateral gma is constant and does not change with respect to the prior art. Said di and d2 are the thicknesses of the small individual plates in the mutual overlapping zones and said "D" is the total thickness of the gma corresponding to that of the prior art, ie di + d2 = D is valid. Preferably di = d2 = D / 2.

Said steps (one for each of the two ends of the piece) can be formed on the same side of the piece or on opposite sides of the same piece. More than one step can also be provided for each end. This creates a zigzag trajectory (more difficult for the lubricant to go beyond, but that implies a more complex machining).

Other embodiments do not exclude an overlap of linear type (ie, along a line) between two contiguous pieces of the lateral gma and / or other shapes of the piece.

It is essential that the overlap zones guarantee a reliable seal without complicating the assembly and / or manufacturing costs in an unsustainable manner.

Brief description of the drawings

The present invention will be illustrated below in more detail and in its various aspects, through various drawings in which it is represented:

Figure 1 shows the overall view of the arm of the sawing machine according to the present invention;

Figure 2 shows the side view of the arm shown in Figure 1, omitting various components including the drive pin, the small transmission wheel, the cutting chain, etc .;

Figure 3 shows a view analogous to Figure 2 but without the improvement introduced by the present invention in the lateral ranges (prior art);

Figure 4 shows a side view of only the side ranges of one side of the arm, in accordance with the present invention;

Figure 5 shows a side view analogous to Figure 4 but in relation to the lateral gma of the prior art;

Figure 6 shows one of the two flanks of the arm, to protect and assemble the small free transmission wheel located at the free end (according to the prior art);

Figure 7 shows an arm flank, to protect and assemble the small free transmission wheel located at the free end (according to the present invention);

Figure 8 shows the sections (in the joint) of various possible innovative embodiments of small parts or plates of the side gma, which show the overlapping of such parts or modules of the side gma of the cutting chain to prevent grease leakage lubricant;

Figure 9 shows a comparison between two possible embodiments with a single step (straight profile on the left and curved profile on the right) for a single piece or module of the lateral groove of the present invention;

Figure 10 shows respectively a side view and a sectional view of a module or small plate of the lateral gma according to the present invention, in the preferred embodiment, with rectilinear step;

Figure 11 shows a small module / plate of the prior art (side view and sectional view, respectively);

Figure 10a shows an analogous view to that of Figure 10, but on an even larger scale; Figure 11a shows a view analogous to Figure 11 but on an enlarged scale (prior art); Figure 12 shows (prior art) an input module for the lateral gma; Figure 13 shows an input module for the lateral gma, in accordance with the present invention; Figure 14 shows the input module of Figure 13, on an enlarged scale;

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Figure 15 shows the butt joint between the module of Figure 11 and the input module of Figure 12 (for the prior art);

Figure 16 shows the overlapping joint between the module of Figure 10 and the input module of Figure 13, in accordance with the present invention;

Figure 17 shows a summary of the various components of the chain saw arm, in accordance with the prior art and in accordance with the present invention, respectively, and specifically:

Figure 17a shows the flank for protecting and assembling the small wheel, according to the prior art (5) and according to the present invention (15), respectively;

Figure 17b shows the innovative entrance of the side grille;

Figure 17c shows the entry of the lateral grille of the prior art;

Figure 17d shows an intermediate module of the side grid (prior art, see Figure 11 and Figure 3);

Figure 17e shows an intermediate module of the lateral (left) lane according to the invention (see Figure 2);

Figure 17f shows an intermediate module of the lateral (right) lane according to the invention (see Figure 2).

Detailed description of some embodiments

Some possible embodiments of the present invention will be described below. As indicated above, the invention can be applied to arms of any type, not only to those illustrated in Figure 1.

The arm of a sawing machine with cutting chain used in quarries of ornamental stones has a substantially flat and elongated shape (for example, approximately 3.8 cm in maximum thickness), with a drive pin 100 of the chain mounted on a machine support (not shown) as shown in Figure 1. The free end 101 of the saw arm supports a small transmission wheel 102 mounted on a bearing. The cutting chain 103 slides between the side grids 104 (the side grille 104 on the upper part of the arm has been omitted to make the chain 103 visible from the rear), around the arm penimeter and around the drive pin 100 and the small transmission wheel 102. The base of the cutting chain groove (slot) comprises a plurality of replaceable expendable parts made of metal (also hard metal) clearly visible in Figure 1, where the upper sector of the chain it slides (that is, where the side grille 104 in the drawing has been omitted).

The cutting arm comprises (see also Figure 2) a flat main body 1 with an elongated shape that extends substantially from the drive pin 100 to the small wheel 102 (free end 101), that is, respectively from the end of the body main indicated with 1 'to the one indicated with 1 "(the last one is shown with dashed lines, since in this side view of Figure 2 it is hidden by a flank 15).

The main body 1, as is known to those skilled in the art, has stepped edges for the assembly of the side grids, which in the prior art constitute various modules or pieces in the form of a small plate 3 that can be fixed by means of screws 4 (two or three normally) to the main body 1 along its stepped edge. This is clearly shown in Figure 3 (prior art). On the part of the input / access arm for the chain (side of the drive pin), there are two (preferably four, if the opposite side of the arm is also not visible in the side view) modules or input parts that form a angle with a respective final intermediate crane module 3. For the present invention, it is essential to note once again that the joints between two pairs of modules (3, 3) and (3, 3i) of the prior art constitute "butt joints "3-3 or 3-3i, which, for the reasons mentioned above, create interstices, where the lubricating grease easily finds an exit route. The current problem also arises in the prior art (Figure 3), also in the joint between the so-called flank 5 and the intermediate side grinding pieces 3. At this point, on each side of the main body 1 a respective step for assembling is provided a corresponding flank 5. Between the two flanks (5, 5), the small wheel (not shown in Figure 3) is mounted with the relative bearing 6. The butt joint indicated with 7 in Figure 3, between components 5 and 3, causes the same problems in relation to the exit of lubricating grease through the interstitium.

These problems are solved in accordance with the preferred embodiment of the present invention using special side-grab modules and special flanks, indicated in Figure 2 with 2d and 2s ("d" and "s" mean left or right) and with 15.

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Specifically, without having to modify the assembly technique (screws 4), the materials (fungible materials), nor increase the accuracy of the operation of the modules of the lateral gma (and the flanks) with respect to the prior art, and without to increase the total thickness of the lateral gma itself, the present invention proposes to use modules or stepped pieces that can overlap, which leave a certain clearance to make it possible to achieve an easy assembly (and therefore, without carrying the operating accuracy to the extreme ); this creates a contact between the surfaces of the steps of the adjacent pieces, such that it prevents (also due to the pressure exerted by the fastening of the screws 4) the lubricating grease exit through the groove of the chain.

Several possible specific embodiments of the modules (or parts) of the lateral gam according to the present invention will be illustrated below.

In Figure 9, on the left side, in Figure 10, and in the enlarged view of Figure 10a, the preferred embodiment of an intermediate GMA module according to the present invention is illustrated. Figure 9 only shows a final portion, in perspective view, of the intermediate module 2d (or 2s) of the present invention. Holes (flared) for screws 4 have been omitted at this point to simplify the drawing, but instead are indicated with reference 9 in Figures 10 and 10a. The 2s or 2d module has the form of a plate with the ends that form a step. In this preferred embodiment, the steps 10a and 10b are formed on opposite sides (faces) of the module and two modules of this type are flanked and mounted in such a way that at least partially overlap the surfaces "A" and "B" of such steps . The precision of the process does not have to be taken to the extreme, and the surface tolerances (A + e, B + e) can be selected in such a way as to guarantee low costs and sufficient overlap.

When tightening the screws 4, the pressure on the surfaces "A" and "B" in mutual contact will prevent lubricant grease from leaking out.

Of course, other forms are possible for (intermediate) modules of the lateral gma, although they are less practical since they are more difficult to obtain. The shape shown on the right side of Figure 9 is curved instead of straight, so that surfaces A or B are not straight. Of course, in this case, the other end of the module - indicated in this document with 2d (1) or 2s (1) -, not shown, must be complementary and therefore concave to fit the end shown but with relationship to the adjacent module. Also in this case the two staggered surfaces A - B overlap, creating a "surface to surface joint" that prevents lubricant grease from leaking out.

Other possible embodiments for these pieces of lateral gma according to the invention are shown schematically in a sectional view in Figure 8. The configuration "1" corresponds to the one already analyzed, the form "2" is the double step (trajectory in zigzag, difficult for the lubricant to pass beyond and with two pairs of contact surfaces A, A 'and B, B'), however the shapes "3", "4" and "5" require a fitting of fit lateral (longitudinal) between two closing modules. The modules are all indicated with 2d in Figure 8 for the sake of simplicity, but of course they may correspond to the left lateral gma and therefore constitute the 2s modules.

All of these embodiments shown in Figure 8 correspond to a straight joint, but there could also be combinations between the embodiments of Figure 8 and the embodiment of Figure 9, right side (curved joint).

With respect to Figures 2 and 7, these illustrate a modified flank15, in accordance with the present invention. The flank 15 is visible in the side view of Figure 2 and is screwed (by means of screws inserted in the holes 16) to one side of the main body 1 (near the end "1"). Another flank 15 identical thereto is It is clearly located on the opposite side of the main body 1. Between these flanks 15, 15, the small transmission wheel of the cutting chain is mounted by means of the bearing 6 (shown only schematically).

Unlike flank 5 (Figures 6 and 17a on the left) of the prior art, flank 15 of the present invention does not have an entirely straight edge 5a, but rather has two grooves 15 'and 15 "at its edge 15a (rectilmeo), which form a respective step that cooperates with the stepped ends of the contiguous module 2d (2s) described above (see Figure 2), in this case, the final intermediate module 2d (2s) is only shorter with respect to to the other intermediate modules 2d (2s).

In Figures 2, 13, 14 and 16, on the other hand, the shape of the lateral gma module (or piece) according to the invention in the area adjacent to the drive pinion is observed. In this case, the module, called input module 2i (right or left, same symbol used in Figure 2) has an oblique stepped side 17 to engage with the adjacent step existing in intermediate module 2s (or 2d). Other shapes may also be provided (see Figure 8) with respect to the joint 18 in Figure 16.

Other embodiments / types of cutting arms, in which the lateral gma of the cutting chain may form a deflection, may comprise modules with an oblique end as in Figure 13.

Only for the sake of a complete description, it can be seen that the rectangular notch 19 in Figure 13 existing in the input module 2i belongs to the prior art; This acts as a seat for a scraper (rubber prism with steel blade) that pressing on the side of the chain prevents debris from reaching the drive pin and damaging it.

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Claims (9)

5 10 fifteen twenty 25 30 35 40 Four. Five fifty 55 1. Arm, preferably orientable, of a sawing machine with cutting chain (103) to preferably cut ornamental stones in quarries, to execute, for example, horizontal and / or vertical cuts, comprising a main body (1), at less a drive pin (100) of the chain connectable by means of a support to the saw machine, at least one small freewheel (102), preferably located at a free end (101) of the arm of the saw machine, wherein along the outer peripheral edge of the main body (1) of the arm of the sawing machine, on both sides of this elongated flat arm, respective side grains (104) of modular type are provided, comprising a plurality of side-mounted parts mounted on the main body (1) of the arm of the saw machine detachably and side-by-side, preferably contiguous at the ends, characterized in that said side-mounted parts determine, during assembly In the arm of the sawing machine, a contact overlapping zone (A - B) at its ends and between each pair of adjacent side grinding pieces is placed, and said area prevents a lubricating means from coming out between the flanked ends of the pieces, and because the thickness of the side grid (104) does not increase due to these overlaps but rather remains substantially constant. 2. Arm of a sawing machine with cutting chain (103) according to claim 1, characterized in that said side-grinding parts are mounted in a detachable manner by means of fastening means (4), for example screws ( 4), which cross through through holes (9) of the side grinding piece, and threaded holes that can be aligned with them existing in the main body (1); and because the clamping force transmitted by these clamping means (4) to said contact overlapping zone (A-B) helps to prevent the lubricating medium from leaving the side grids (4). 3. Arm of a sawing machine with cutting chain (103) according to claim 1 or 2, characterized in that said side-grinding pieces comprise rectangular plates (2s; 2d) with stepped ends (10a, 10b) which determine overlapping surfaces (A, B) between contiguous pieces at these staggered ends, however without increasing the total thickness (D) of the side grille (104). 4. Arm of a sawing machine with a cutting chain (103) according to claim 1, 2 or 3, characterized in that said side-grinding pieces can have a variable length between sf. 5. Arm of a sawing machine with cutting chain (103) according to any one of the preceding claims, characterized in that a piece of lateral grinding (2i) can form an angle with respect to an adjacent lateral grinding piece ( 2s; 2d). 6. Arm of a sawing machine with a cutting chain (103) according to any one of the preceding claims, characterized in that the side-grinding pieces also comprise two flanks (15, 15) for assembling and protecting the small wheel ( 102), which are fixed to the main body (1) of the arm of the sawing machine on their respective sides, and which have overlapping zones (20, 20) with adjacent modules (2s; 2d), adapted to prevent the exit of the lubricating medium. 7. Arm of a sawing machine with cutting chain (103) according to claim 6, characterized in that in said overlapping areas (20, 20), each flank (15) has stepped grooves (15 ', 15 " ) that overlap with staggered areas (10a, 10b) or on their surfaces (A; B). 8. Arm of a sawing machine with cutting chain (103) according to any of the preceding claims, characterized in that the lubricating means introduced in a circuit for feeding lubricating means is an ecological lubricating means. 9. Arm of a sawing machine with cutting chain (103) according to any one of the preceding claims, characterized in that the size of the contact overlapping areas (A, B) is selected in such a way that the tolerances Operating "g" in any case guarantees a sufficient contact surface between the adjacent parts, without having to bring the precision of operation to the extreme.