JP5818615B2 - Road leveling machine leveling equipment - Google Patents

Description

  The present invention relates to a leveling device for road pavement machines, and in particular, it is possible to appropriately perform minus crown pavement construction in a pavement construction width region where pavement construction with a minus crown was impossible. The present invention relates to a leveling device for a road pavement machine that improves performance.

  As a first conventional technique related to a leveling device for road paving machines, for example, screed devices for road paving vehicles such as asphalt finishers as shown in FIGS. 3 and 4 (a) and (b) are known. ing. In FIG. 3, the road pavement machine 1 includes a hopper 3 that receives asphalt mixture from a dump or the like at a front portion of a machine body 2, and a conveyor bar feeder 4 for sending the asphalt mixture in the hopper 3 backward. ing. The asphalt mixture sent rearward by the conveyor bar feeder 4 falls to the roadbed, and is then sent by the screw spreader 5 provided behind the machine body 2 in the leveling width direction. The asphalt mixture is spread on the roadbed by a screed device (laying leveling device) 7 connected to the machine body 2 by the screed arm 6 behind the screw spreader 5.

  The screed device 7 is configured so that the spread width can be changed, and the first and second extendable screeds 9 having a width substantially equal to the width of the main screed 8 are provided behind the main screed 8. , 10 are arranged side by side in front and rear, and are housed within a width substantially equal to the width of the main screed 8 in the housed state of the first and second telescoping screeds 9, 10 shown in FIG. . As shown in FIG. 4B, holes (not shown) are provided in the support support portions 11 and 12 provided on both sides of the rear upper portion of the main screed 8, and the guide shaft 13 or 14 can be slid in the lateral direction in the holes. I support it. Then, both end portions of the guide shaft 13 or 14 are fixed to both ends of the support 15 or 16. Also, holes (not shown) are provided at both ends of the support 15 or 16, and the guide shaft 17 or 18 is slidably supported in the holes, and both end portions of the guide shaft 17 or 18 are extended in the first and second directions. It is fixed to both ends of the screed 9 or 10. Furthermore, a feed device such as a hydraulic cylinder (not shown) is provided, and the first telescoping screed 9 or the second telescoping screed 10 is spread from the rear position of the main screed 8 in the leveling width direction and in the opposite direction to each other, In the state where the first telescoping screed 9 and the second telescoping screed 10 shown in FIG. 4B are expanded to the maximum extent, the spread leveling range should be expanded to about three times the main screed width L (see Lmax). (See, for example, Patent Document 1).

  Moreover, as a 2nd prior art, there exists a thing as shown to (a), (b) of FIG. 5, for example. This prior art is a type of screed apparatus in which a pair of first and second telescoping screeds 9 and 10 having a width substantially equal to the width of the main screed 8 are arranged in front of and behind the main screed 8 as described above. A crown adjustment mechanism (not shown) is attached to 7A to set a required crown amount. FIG. 5A is a plan view, and FIG. 5B is a rear view. Here, as shown in FIG. 5B, the crown amount is a value corresponding to the inclination angle θ of the bottom surface of the screed with the center in the width direction (lateral direction in FIG. 5B) of the bottom surface of the screed. It is set in the range from positive to negative for the purpose of improving pavement quality. A case where θ <180 ° is a plus crown, and a case where θ> 180 ° is a minus crown. Therefore, the case of FIG. 5B shows a case where the minus crown is set.

  However, in this type of screed device 7A, when the first and second telescoping screeds 9 and 10 are extended so that their inner ends 9a and 10a do not exceed the center line of the machine body, When the minus crown is attached, as shown in FIG. 5 (b), the lower surfaces near the inner ends 9 a and 10 a of the first and second telescoping screeds 9 and 10 protrude below the lower surface of the main screed 8. End up. In this state, when the asphalt composite material is spread and leveled, the main screed 8 spreads the leveled pavement surface so that the lower ends in the vicinity of the inner ends 9a and 10a of the first and second stretchable screeds 9 and 10 are paved. The quality will be degraded.

  In this type of screed device 7A, the extension state of the first and second telescoping screeds 9 and 10 when the above problems occur will be described as a numerical example as follows. That is, the minimum pavement construction width (substantially the same as the main screed width L) of the screed device is, for example, 2.3 m, the maximum pavement construction width is 6 m, and the first and second telescoping screeds 9 and 10 are extended. If the pave width when the inner ends 9a, 10a are at the position of the machine body center line is about 4 m, for example, when the pave width is set to 4 m or less, the first and second extendable screeds 9, 10 The lower surfaces near the inner ends 9 a and 10 a protrude downward from the lower surface of the main screed 8.

  Further, as the third prior art, for example, there is one as shown in FIG. In this prior art, when the first and second telescoping screeds 9 and 10 are formed to be substantially equal to the width of the main screed 8, the first telescoping screed 9 is disposed in front of the main screed 8. The second telescoping screed 10 is a type of screed device 7 B disposed behind the main screed 8. Also in this type of screed device 7B, when the first and second telescoping screeds 9 and 10 are extended so that their inner ends 9a and 10a do not exceed the center line of the machine body, they are negative to the screed device. When the crown is applied, not only the second telescoping screed 10 disposed behind the main screed 8 but also the first telescoping screed 9 disposed in front of the main screed 8 is produced in the second prior art. A problem similar to the problem arises.

Japanese Patent No. 3383908

  In the first prior art described in Patent Document 1, a type of screed device in which a pair of first and second telescoping screeds having a width substantially equal to the width of the main screed is provided in front of and behind the main screed. It is shown.

  In the second prior art shown in FIGS. 5 (a) and 5 (b), in the screed device of the same type as described above, the inner ends of the first and second telescoping screeds do not exceed the machine body center line. If the screed device is attached with a minus crown when it is stretched within the range, the lower end of each of the first and second telescoping screeds near the inner ends of the pavement surface is spread and the pavement quality is improved. It will deteriorate. Therefore, there is a problem that a pavement construction width region in which the pavement construction with a minus crown is impossible occurs in the screed device, and the performance of the road pavement machine is reduced.

  Further, in the third prior art shown in FIG. 6, the first telescoping screed is disposed in front of the main screed out of the first and second telescoping screeds formed to be substantially equal to the width of the main screed. Even in the type of screed device arranged behind the main screed, the second telescoping screed is extended within the range where the inner ends of the first and second telescoping screeds do not exceed the machine body center line. In addition, when a minus crown is attached to the screed device, a problem similar to the problem that occurs in the second prior art occurs.

  Therefore, a main screed and a pair of telescoping screeds having a width substantially equal to the width of the main screed, the type in which the pair of telescoping screeds are arranged behind the main screed, and the pair of telescoping screeds are the main screeds. In the spread leveling device, which is a type disposed in front of the main screed or a type in which one of the pair of telescoping screeds is divided into a front and a rear of the main screed, a minus crown The technical problem to be solved in order to improve the performance by making it possible to properly perform the minus crown pavement construction in the pavement construction width region, in which the pavement construction of the present invention was impossible, arises in the present invention. It aims at solving this subject.

The present invention has been proposed in order to achieve the above object, and the invention according to claim 1 includes a main screed and a pair of telescoping screeds that are substantially equal in width to the main screed and extend in opposite directions. A type in which the pair of telescoping screeds are disposed behind the main screed, a model in which the pair of telescoping screeds are disposed in front of the main screed, or one of the pair of telescoping screeds and the other of the main screed. In the spread leveling device according to any one of the types arranged separately at the front and rear of each of the pair of telescoping screeds, the inner ends of the pair of telescoping screeds sandwich the machine center line in the extending direction. crown amount when located on the opposite side of each outer end screed lower surface of the pair of extendable screeds formed with respect to the vertical direction about the machine center line of the When the inclination angle is set to the negative as a greater than 180 ° range, the by pulling the screed plate required length range at each inner end of said pair of extendable screeds in accordance with the negative set amount of the crown amount Provided is a leveling device for a road pavement machine provided with a lifting mechanism that raises the lower side of the main screed .

According to this structure, when each inner end of a pair of expansion-contraction screed is extended in the range which does not exceed a machine center line , that is, each inner end of a pair of expansion-contraction screed extends and contracts across a machine center line in the extension direction. Even if the crown amount is set to minus when positioned on the opposite side of each outer end of the screed, the screed plate within the required length range on each inner end side of the pair of telescoping screeds is set according to the minus set amount of the crown amount. By pulling up, the lower surface in the vicinity of each inner end of the pair of telescoping screeds rises above the lower surface of the main screed. As a result, there is no inconvenience that the lower end in the vicinity of each inner end of the pair of stretchable screeds gets out of the leveling surface of the main screed or the surface to be leveled.

According to a second aspect of the invention, in the invention according to the first aspect, before Symbol pulling mechanism, before Symbol the lower surface portion of the respective extendable screed in required length portion from the inner end as a hinge portion of the pair of extensible screeds Provided is a leveling device for a road pavement machine, which is a refraction vertical type that raises a screed plate of each required length range at an angle.

  According to this configuration, the pulling mechanism is refracted up and down, and the lower surface of each telescoping screed is hinged to raise the screed plate of each required length range at an angle, thereby making the vicinity of each inner end of the pair of telescoping screeds It becomes possible to raise the lower surface above the lower surface of the main screed easily and surely.

According to a third aspect of the present invention, in the first aspect, before Symbol pulling mechanism, the pre-Symbol screed plates of each required length range above and below the required length portion from the inner end of the pair of extendable screeds Provided is a leveling device for a road pavement machine which is configured to be slidable and which is a parallel up-down type that slides a screed plate of each required length range parallel to a slide surface and pulls it up.

  According to this configuration, the pulling mechanism is parallel up and down, and the screed plate of each required length range is slid parallel to the slide surface and pulled up, so that the lower surface near the inner ends of the pair of telescoping screeds is the lower surface of the main screed. It is possible to raise it more easily and surely.

The invention according to claim 1 includes a main screed and a pair of telescoping screeds having a width substantially equal to the width of the main screed, and the pair of telescoping screeds disposed behind the main screed, the pair of screeds. The spread leveling is either a type in which the expansion / contraction screed is arranged in front of the main screed or a type in which one and the other of the pair of expansion / contraction screeds are arranged separately in front and rear of the main screed. In the device, minus crown pavement construction is performed in the pavement construction width region where each inner end of a pair of stretchable screed is extended in a range located on the opposite side of each outer end of the stretchable screed across the machine center line in the extending direction. There is an advantage that it can be performed properly and the performance of the spreader can be improved.

  According to the second aspect of the invention, in addition to the effect of the first aspect of the invention, the lowering mechanism near the inner end of each of the pair of telescoping screeds is more reliable than the lower surface of the main screed because the pulling mechanism is a refraction vertical type. It is possible to easily achieve proper minus crown pavement construction in the pavement construction width region in which each inner end of the pair of stretchable screeds extends within a range not exceeding the machine center line. There are advantages.

  According to the third aspect of the invention, in addition to the effect of the first aspect of the invention, the lowering mechanism in the vicinity of the inner ends of the pair of telescoping screeds is more reliable than the lower surface of the main screed. It is possible to easily achieve proper minus crown pavement construction in the pavement construction width region in which each inner end of the pair of stretchable screeds extends within a range not exceeding the machine center line. There are advantages.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the spread | equalizing leveling apparatus to which the refraction | bending vertical pulling mechanism based on Example 1 of this invention is applied, (a) is a top view, (b) is a rear view. The rear view of the spread leveling apparatus to which the parallel up-and-down type pulling mechanism which concerns on Example 2 of this invention is applied. The top view of the road paving machine as a 1st prior art. It is a figure which shows the screed apparatus in the road paving machine of FIG. 3, (a) is a top view when the 1st, 2nd expansion-contraction screed is in the accommodation state, (b) is the 1st expansion-contraction screed and 2nd The top view which shows the state by which the expansion-contraction screed was expanded to the maximum. It is a figure which shows the screed apparatus as 2nd prior art, (a) is a top view, (b) is a rear view. The top view of the screed apparatus as a 3rd prior art.

The present invention comprises a main screed and a pair of telescoping screeds having a width substantially equal to the width of the main screed, the type in which the pair of telescoping screeds are disposed behind the main screed, and the pair of telescoping screeds In the spread leveling device of the type arranged in front of the main screed or the type of one of the pair of telescoping screeds and the type arranged separately in the front and rear of the main screed, minus In order to achieve the purpose of improving the performance by making it possible to properly perform the minus crown pavement construction in the pavement construction width region where the pavement construction at the crown was impossible, the main screed and the main screed A pair of telescoping screeds that are substantially equal in width and extend in opposite directions, and the pair of telescoping screeds are arranged behind the main screed. Either the type in which the pair of telescoping screeds are arranged in front of the main screed or the type in which one and the other of the pair of telescoping screeds are arranged separately in front and rear of the main screed. In the spread leveling device, when the inner ends of the pair of telescoping screeds are positioned on opposite sides of the outer ends of the pair of telescoping screeds across the machine center line in the extending direction, the crown amount is determined by the pair of telescoping screeds. When the inclination angle formed on the lower surface of the screed with respect to the vertical direction around the machine center line is set to a minus value in a range larger than 180 °, the required length range on each inner end side of the pair of telescoping screeds Pulling up the screed plate above the lower surface of the main screed by pulling up the screed plate according to the negative setting amount of the crown amount Realized by providing a mechanism.

  A preferred embodiment 1 of the present invention will be described below with reference to FIGS. First, the configuration of the road leveling machine leveling apparatus according to the present embodiment will be described. In FIG. 1 (a), a spread leveling device (screed device) 19 includes a pair of telescoping screeds 21 and 22 extending back and forth behind a main screed 20 and having the same width as the main screed 20 and extending in opposite directions. Are installed side by side.

And in order to avoid the malfunction demonstrated using the said FIG.5 (b), in this Example, each inner end 21a, 22a of a pair of expansion-contraction screeds 21 and 22 is expanded in the range which does not exceed a machine centerline. In other words, when the crown amount is set to be negative when the inner ends 21a, 22a of the screeds 21, 22 are positioned on the opposite sides of the outer ends of the screeds 21, 22 across the machine center line in the extending direction. A refraction vertical pulling mechanism is provided that pulls up the screed plates 21b, 22b within a required length range on the inner ends 21a, 22a side of the pair of telescoping screeds 21, 22 in accordance with the minus set amount of the crown amount. . Here, the “extension direction” of the screed plates 21 and 22 refers to the direction in which the stretchable screeds 21 and 22 respectively extend, and the extension direction of the stretchable screed 21 refers to the direction from the center to the left in FIG. The extension direction of the stretchable screed 22 refers to a direction from the center of FIG. 1 toward the right.

  As shown in FIG. 1B, the refraction up-and-down type pulling mechanism is configured such that the lower surface portion of each of the telescoping screeds 21 and 22 at a required length portion from the inner ends 21a and 22a of each of the telescoping screeds 21 and 22 The screed plates 21b and 22b within a required length range are configured to be lifted at an angle as 23a and 23b.

  As means for pulling up each screed plate 21b, 22b within the required length from the hinges 23a, 23b at an angle, a manual operation method and a telescopic position of each telescoping screed 21, 22 are automatically set by a limit switch or the like. And a method of automatically controlling an operation of raising the angle with an angle based on the detection result.

  Next, the operation of the leveling device for the road paver according to the present embodiment configured as described above will be described. Even if the crown amount is set to a negative value when the inner ends 21a and 22a of the pair of telescoping screeds 21 and 22 are extended within a range not exceeding the machine center line, The screed plate inner ends 21b and 22b within a required length range on the inner ends 21a and 22a side of the telescoping screeds 21 and 22 are lifted at an angle with the lower surfaces of the telescoping screeds 21 and 22 as hinge portions 23a and 23b.

  As a result, the lower surfaces near the inner ends of the pair of telescoping screeds 21 and 22 are raised above the lower surface of the main screed 20. As a result, the problem that the lower end in the vicinity of the inner ends 21a, 22a of the telescoping screeds 21, 22 disposed behind the main screed 20 is eliminated from the leveling surface of the main screed 20 is eliminated. When the inner ends 21a and 22a of the pair of telescoping screeds 21 and 22 are extended beyond the machine center line, the inner ends 21a and 22a of the telescoping screeds 21 and 22 are set even if the crown amount is set to be negative. Since the lower surface in the vicinity of 22a does not protrude below the lower surface of the main screed 20, the screed plates 21b and 22b within the required length range are lowered to a position where the entire telescoping screeds 21 and 22 become flat.

  As described above, in the road leveling machine leveling apparatus according to the present embodiment, a pair of telescoping screeds 21 that extend substantially in the opposite direction with the same width as the main screed 20 behind the main screed 20. In the leveling device 19 of the type in which 22 is arranged side by side, in the pavement construction width region where the inner ends 21a and 22a of the pair of telescoping screeds 21 and 22 extend within a range not exceeding the machine center line. The minus crown pavement construction can be properly performed, and the performance of the spread leveling device 19 can be improved.

  By making the pulling mechanism refracted up and down, the lower surface in the vicinity of the inner ends 21a, 22a of the pair of telescoping screeds 21, 22 can be surely raised above the lower surface of the main screed 20, and the pair of telescoping screeds 21, 22 Appropriate minus-crown pavement construction can be easily realized in the pavement construction width region in which the inner ends 21a, 22a of 22 extend within a range not exceeding the machine center line.

  A second embodiment of the present invention will be described with reference to FIG. In the present embodiment, the pulling mechanism is configured in a parallel vertical manner. As shown in FIG. 2, the parallel up-and-down type pulling mechanism includes a pair of telescoping screeds 21 and 22, and screed plates 21 b and 22 b within a required length range on the inner ends 21 a and 22 a side. The screed plates 21b and 22b within the required length range are slid in parallel with the slide surfaces 24a and 24b, respectively, and pulled up from the inner ends 21a and 22a. Yes.

  As means for sliding the screed plates 21b, 22b in the required length range in parallel with the slide surfaces 24a, 24b, the manual operation method, the expansion / contraction positions of the expansion / contraction screeds 21, 22 are limit switches, etc. A method of automatically detecting and automatically controlling the up / down operation based on the detection result is applied.

  The leveling device of the road pavement machine according to the present embodiment is configured such that the pulling mechanism is a parallel vertical type, and the screed plates 21b and 22b within a required length range are slid in parallel with the slide surfaces 24a and 24b, respectively, It becomes possible to raise the lower surface in the vicinity of the inner ends 21 a, 22 a of the telescoping screeds 21, 22 easily and surely above the lower surface of the main screed 20.

  As described above, in the road leveling machine leveling apparatus according to this embodiment, the pulling mechanism is a parallel vertical type, so that the lower surface in the vicinity of the inner ends 21a, 22a of the telescoping screeds 21, 22 is the main screed 20. An appropriate negative crown in the pavement construction width region in which the inner ends 21a, 22a of the pair of telescoping screeds 21, 22 extend within a range not exceeding the machine center line. Pavement construction can be easily realized.

  In the first and second embodiments described above, a type of spread leveling device in which a pair of stretchable screeds 21 and 22 are arranged in front of the main screed 20 and one stretchable as shown in FIG. The screed 21 may be disposed in front of the main screed 20, and the other telescoping screed 22 may be applied to a type of leveling device disposed behind the main screed 20. Even when the spread leveling device is of both types, a refraction vertical or parallel vertical lifting mechanism is provided on the inner ends 21a and 22a of the pair of telescoping screeds 21 and 22, respectively.

  Further, the present invention can be variously modified without departing from the spirit of the present invention, and the present invention naturally extends to the modified ones.

  A main screed and a pair of telescoping screeds having a width substantially equal to the width of the main screed, wherein the pair of telescoping screeds are arranged behind the main screed, and the pair of telescoping screeds are arranged in front of the main screed. Pavement with a minus crown in the spread leveling device of the type arranged in the above or the type in which one of the pair of telescoping screeds and the other is divided into the front and rear of the main screed Laying leveling machine including asphalt finisher with and without emulsion spraying function, which is necessary to improve performance by making it possible to properly perform minus crown pavement construction in the pavement construction width area where construction was impossible It can be widely applied to.

DESCRIPTION OF SYMBOLS 1 Road pavement machine 2 Machine main body 3 Hopper 4 Conveyor bar feeder 5 Screw spreader 6 Screed arm 7, 7A, 7B Screed device (laying leveling device)
8 Main screed 9 First telescoping screed 10 Second telescoping screed 11, 12 Support support 13, 14 Guide shaft 15, 16 Support 17, 18 Guide shaft 19 Spreading device (screed device)
20 main screed 21 telescoping screed 22 telescoping screed 21a, 22a inner end 21b, 22b screed plate 23a, 23b hinge part 24a, 24b sliding surface

Claims (3)

A type having a main screed and a pair of telescoping screeds that are substantially equal in width to the main screed and extend in opposite directions, and the pair of telescoping screeds are arranged behind the main screed, the pair of telescoping screeds In a leveling apparatus having a type arranged in front of the main screed or a type in which one and the other of the pair of telescoping screeds are separately arranged in front and rear of the main screed. ,
When the inner ends of the pair of telescoping screeds are located on opposite sides of the outer ends of the pair of telescoping screeds across the machine center line in the extending direction, the crown amount of the pair of telescoping screeds is determined by the lower screed surfaces of the pair of telescoping screeds. When the inclination angle formed with respect to the vertical direction with respect to the center line is set to a minus value in a range larger than 180 ° , the screed plate having a required length range on each inner end side of the pair of telescoping screeds is set to the crown amount. A leveling device for a road pavement machine , comprising a lifting mechanism that is lifted according to a minus set amount of the main screed to raise it above the lower surface of the main screed . Before SL pulling mechanism, the refractive vertical raising before Symbol screed plates each required length range lower surface portion as the hinge portion of the respective extendable screed in required length portion from the inner ends of the pair of extendable screeds at an angle The road leveling machine leveling apparatus according to claim 1, wherein the leveling apparatus is a formula. Before SL pulling mechanism, the pre-Symbol screed plates of each required length range configured to be slide up and down in the required length portion from the inner end of the pair of extendable screeds, the screed plate of the required length range 2. The leveling device for a road pavement machine according to claim 1, wherein the leveling device is a parallel up-and-down type that is slid parallel to the slide surface and pulled up.

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