JP2008014023A - Paving machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that measurement cannot be accurately performed when a position to supply a new material is not located immediately above a supporting point on a front end side, in the case of a conventional paving machine employing a load-cell measuring bar feeder. <P>SOLUTION: In the bar feeder 4 which is provided in the road paving machine 2 for regenerating a road, two chains 44 and 44, which are laid between sprockets 42a and 42a at both the ends of a driven shaft 42 and sprockets 43a and 43a at both the ends of a driving shaft 43, respectively, are circulated in a direction indicated by an arrow, according to the rotation of the driving shaft 43, between a conveyance track for moving immediately above a sliding plate 41b of a casing 41, and a return track for passing through a hopper 3, supported by a traveling vehicle 21, through a section above the conveyance track. A bar 45 of the bar feeder 4 passes immediately above a bottom plate 31 of the hopper 3 on the return track, and drops the new material on the bottom plate 31 onto the sliding plate 41b. Additionally, the bar moves immediately above the sliding plate 41b which is positioned below the hopper 3, and conveys the new material, on the conveyance track. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a paving machine that calculates the transport amount of a paving material supplied from a hopper and transported by a bar feeder.

  Conventionally, as this type of pavement machine, for example, there is a road surface layer regeneration device disclosed in Patent Document 1 below. This road surface layer recycling apparatus includes a hopper that receives a supply of new pavement material from a dump truck that runs ahead, at the foremost part of the traveling vehicle. The new material supplied to the hopper is transported to the rear end side of the traveling vehicle by the feeder and supplied to the mixing container of the bag mill mixer. A scarifier for scraping the pavement on the road surface is disposed at the lower part of the traveling vehicle, and the recycled material obtained by scraping the pavement is conveyed to the rear heater by the feeder. The amount of recycled material obtained from the road surface is calculated on the basis of the measured value of the laser sensor in front of the sculpture. The recycled material heated by the heater is supplied to the mixing container of the bag mill mixer by the feeder. The weight of the mixture of new material and recycled material in the mixing container is measured using a load cell, and an amount of additive corresponding to the measured weight of the mixture is supplied into the mixing container to produce a recycled mixture. Is done. The regenerated mixture is spread on the road surface with a spreading screw and laid down with a screed. In this road surface layer recycling device, the new material is transported from the hopper to the new material surge bin in order to prevent the quality of the recycled mixture from being deteriorated due to a sudden change in the ratio of the new material amount to the recycled material amount. The amount is also measured.

  FIG. 1 is a diagram for explaining a load cell type weighing bar feeder, which is provided in a conventional road surface layer reproducing apparatus of this type, and calculates a conveyance amount of a paving material supplied from a hopper and conveyed by a bar feeder.

In the conventional load cell type weighing bar feeder shown in the figure, the new material thrown into the hopper 11 is carried by the conveyor 11a and dropped onto the sliding plate 12c. The hopper 11 is installed on the traveling vehicle 14 by a support member 11b. A pair of sprockets 12a and 12a are attached to both ends of the bar feeder 12, and a single chain 12b is bridged between the sprockets 12a located on the same side. A plurality of bars (not shown) are spanned between the chains 12b at a predetermined interval. The chains 12b and 12b circulate in the direction of the arrow according to the rotation of the sprockets 12a and 12a, and the bar spanned between the chains 12b and 12b also moves in the direction of the arrow together with the chains 12b and 12b. A sliding plate 12c is disposed immediately below the circulation track of the chains 12b and 12b. The bar conveys the new material on the sliding plate 12c while sliding along the surface of the sliding plate 12c. The new material moves to the rear end of the sliding plate 12c and falls as indicated by the arrow. The bar feeder 12 is installed on the traveling vehicle 14 with one end of the sliding plate 12c supported by a support member 14a provided on the traveling vehicle 14 at a fulcrum 13a and the other end supported by a fulcrum 13b. The load applied to the fulcrum 13b on the rear end side is measured using the load cell 15, and the transport amount of the new material is calculated based on the measured value.
JP-A-1-278605 (page 2, upper right column, line 4 to page 4, upper right column, line 12; page 4, lower right column, line 13 to page 5, upper right column, line 14)

  However, in the pavement machine using the conventional load cell type weighing bar feeder, when the conveying end of the conveyor 11a is positioned immediately above the fulcrum 13a on the front end side, the new material falls on the sliding plate 12c from the conveyor 11a. The impact applied to the sliding plate 12c is suppressed, and fluctuations due to this impact are prevented from occurring in the measured value at the load cell 15 that measures the load applied to the fulcrum 13b on the rear end side. For this reason, in the paving machine using the conventional load cell type weighing bar feeder, measurement using the load cell 15 cannot be performed accurately unless the transport end of the conveyor 11a is positioned directly above the fulcrum 13a on the front end side. The free design such as disposing the conveying end of the conveyor 11a, that is, the supply position of the new material, directly above the sliding plate 12c located on the center side of the fulcrum 13a has been hindered.

  The present invention has been made to solve such a problem. The traveling vehicle, a hopper supported by the traveling vehicle and containing a paving material, and supported by the traveling vehicle below the hopper and accommodated in the hopper. A sliding plate to which the pavement material supplied is supplied, a bar feeder that conveys the pavement material supplied on the sliding plate with a bar provided at a predetermined interval, and one end side of the sliding plate as a fulcrum And a measuring means for measuring the load applied to the other end side, and a calculating means for calculating the transport amount of the paving material transported by the bar feeder based on the load measured by the measuring means. It has a bar circulation track consisting of a transport track that transports the pavement material supplied above along the surface of the plate and a return track that passes through the hopper, and the hopper has a bottom plate that supports the pavement material it houses. Characterized in that the return has directly beneath the track.

  According to this configuration, the pavement material thrown into the hopper and deposited on the bottom plate is carried out of the hopper by the bar passing through the hopper in the return trajectory of the bar feeder, falls on the sliding plate, and is conveyed. It is conveyed along the surface of the sliding plate by bars in the track. For this reason, since the pavement material thrown into the hopper once accumulates on the bottom plate and falls onto the sliding plate, the pavement material falls compared to falling directly on the sliding plate from a high position. As a result, the impact applied to the sliding plate can be reduced. In addition, since the hopper is supported by the traveling vehicle, it is possible to eliminate factors that cause errors in measurement by the measurement means, such as the weight of the hopper and the weight of the pavement material accommodated in the hopper. Therefore, no matter where the hopper is located immediately above the sliding plate, that is, where the pavement supply position is, the variation of the load applied to the other end of the sliding plate is suppressed, and the sliding plate The load applied to the other end of the pavement can be accurately measured, and the amount of pavement transported by the bar feeder can be accurately calculated.

  As a result, according to the present invention, compared to a paving machine using a conventional load cell type weighing bar feeder in which the supply point of the paving material must be positioned directly above the fulcrum of the sliding plate, the paving for the sliding plate is performed. There is provided a paving machine capable of increasing the degree of freedom of the arrangement position of the material supply location.

  Next, the best mode for carrying out the present invention will be described.

  FIG. 2 is a side view showing the outline of the configuration of the road regeneration road pavement machine 2 according to the best mode of the present invention.

  As shown in the figure, the road regeneration road pavement machine 2 is provided with front wheels 27a, 27a and rear wheels 27b, 27b in front and rear of the traveling vehicle 21, and the traveling vehicle 21 includes front wheels 27a, 27a and rear wheels. It is supported on the ground by the rings 27b and 27b. An operation unit 28 and a seat 29 are provided above the screed devices 26 a and 26 b at the rear end of the traveling vehicle 21. The operating unit 28 is provided with levers and switches for operating the traveling vehicle 21 and screed devices 26a and 26b described later.

  In the road regeneration road pavement machine 2, a hopper 3 in which a new material of asphalt composite material which is a pavement material is loaded and accommodated is provided at the foremost part of the traveling vehicle 21. The hopper 3 receives a new material from the loading platform of the dump truck that runs in front. A bar feeder 4 is provided in the traveling vehicle 21 below the hopper 3. The bar feeder 4 has a tip portion located directly below the hopper 3, a rear end extending to the rear side of the traveling vehicle 21, and located in front of the operation unit 28. A collecting device 22 is disposed at the forefront of the traveling vehicle 21 below the hopper 3. The old pavement on the road surface is scraped by a machine that runs in front of the road regeneration road pavement machine 2 and is collected by the collecting device 22. The collecting device 22 includes a pair of screws on the left and right sides, and the paved pavement is collected by each rotating screw. The collecting device 22 is provided with a laser sensor used for measuring the amount of recycled material obtained from the road surface. The laser sensor is electrically connected to a control device included in the traveling vehicle 21. This control device calculates the weight of the obtained recycled material based on the measurement value of the laser sensor. A feeder 23 is provided behind the collecting device 22. The feeder 23 has a front end extending to the inside of the collecting device 22 and a rear end extending to the inside of the traveling vehicle 21.

  The traveling vehicle 21 incorporates a heater and a bag mill mixer (not shown). The heater heats the regenerated material conveyed from the collecting device 22 into the rotating drum by the feeder 23 by blowing hot air into the rotating drum. In the bag mill mixer, new material from the bar feeder 4 and recycled material from the rotating drum are supplied into the mixing container. The weight of the mixture in the mixing container is calculated based on the measurement results using the load cell and the laser sensor, and an amount of additive corresponding to the calculated weight of the mixture is added to the mixing container. A new mixture and a regenerated material are kneaded with an additive in a mixing container, whereby a regenerated mixture is produced.

  From the center of the traveling vehicle 21, a pair of leveling arms 24 and 24 that are pivotally supported on both sides of the traveling vehicle 21 extend rearward. Screw spreaders 25a and 25b and screed devices 26a and 26b positioned immediately after the vehicle are attached to the rear of the traveling vehicle 21, and the screed devices 26a and 26b are pulled by the leveling arms 24 and 24. The front screw spreader 25a and the screed device 26a are raised and lowered according to the expansion and contraction of the hydraulic cylinder 30a, and the rear screw spreader 25b and the screed device 26b are raised and lowered, respectively. The hydraulic cylinders 30a and 30b are respectively connected to a hydraulic pump (not shown) provided in the traveling vehicle 21 via a hose, and are driven by supply of pressure oil from the hydraulic pump. The screw spreader 25a squeezes the regenerated mixture produced in the bag mill mixer and dropped on the ground in the left and right width directions, and the screed device 26a compacts the regenerated mixture squeezed out on the ground to finish the pavement surface smoothly. The screw spreader 25b is conveyed from the hopper 3 and spreads the new material dropped on the pavement surface compacted with the regenerated mixture in the left and right width directions, and the screed device 26b is sprinkled on the ground. The material is compacted onto the regenerated mixture to finish the pavement surface smoothly.

  3-6 is a figure which shows the outline of a structure of the load cell measuring-type bar feeder which consists of said hopper 3 and bar feeder 4 with which the road regeneration road pavement machine 2 is equipped, FIG. 3 is the side view, FIG. FIG. 5 is a cross-sectional view taken along the line AA in FIG. 3, and FIG. 6 is a vertical cross-sectional view taken along the line BB in FIG. In addition, the same code | symbol is attached | subjected to the part which is the same or it corresponds in each figure.

  As shown in these drawings, a bar feeder 4 is provided immediately below the hopper 3. As shown in FIG. 5, the bar feeder 4 includes a casing 41 having a U-shaped cross section. The bottom plate of the casing 41 is located below the hopper 3 and serves as a sliding plate 41b to which a new material accommodated in the hopper 3 is supplied. As shown in FIG. 3, a driven shaft 42 is attached to the front end portion of the casing 41, and a drive shaft 43 is attached to the rear end portion. The driven shaft 42 and the drive shaft 43 are positioned in parallel to each other and are disposed in the casing 41. As shown in FIG. 4, a pair of sprockets 42 a are attached to both ends of the driven shaft 42. As shown in FIG. 3, a pair of sprockets 43a and 43b are attached to both ends of the drive shaft 43, respectively. The sprocket 43b is located outside the sprocket 43a. There is a single chain between the right sprocket 42a of the driven shaft 42 and the right sprocket 43a of the drive shaft 43, and between the left sprocket 42a of the driven shaft 42 and the left sprocket 43a of the drive shaft 43. 44 and 44 are spanned as shown in FIG. A plurality of bars 45 shown in FIG. 5 are bridged and attached between the chains 44, 44 at a predetermined interval.

  As shown in FIGS. 3 and 4, a hydraulic motor 46 is provided at the upper end on one side of the casing 41 in the vicinity of the drive shaft 43. A pair of sprockets 46 b are attached to both ends of the rotating shaft 46 a of the hydraulic motor 46. Between the sprocket 43b on the right side of the drive shaft 43 and the sprocket 46b on the right side of the rotation shaft 46a, and between the sprocket 43b on the left side of the drive shaft 43 and the sprocket 43b on the left side of the rotation shaft 46a, one chain 47 and 47 are bridged as shown in FIG. The hydraulic motor 46 is connected to a hydraulic pump (not shown) provided in the traveling vehicle 21 via a hose, and is driven by supply of pressure oil from the hydraulic pump.

  A pair of attachment pieces 41a and 41a are provided below the sliding plate 41b at the front end and the rear end of the casing 41, respectively. The traveling vehicle 21 is provided with support members 21a and 21a to which the attachment pieces 41a and 41a are attached. The casing 41 is installed on the traveling vehicle 21 with an attachment piece 41 a at the tip thereof being rotatably attached to the support member 21 a by a pin 6. As shown in FIG. 3, the load cell 5 is attached to the pin 7 inserted into the attachment piece 41 a at the rear end of the casing 41. The load cell 5 constitutes a measuring means for measuring a load applied to the pin 7 on the other end side with the pin 6 on one end side of the slide plate 41b as a fulcrum, and is electrically connected to a control device (not shown) provided in the traveling vehicle 21. It is connected to the. This control device constitutes a calculating means for calculating the transport amount of the new material transported by the bar feeder 4 based on the load measured by the measuring means. In this embodiment, the control device applies the load applied to the pin 7 obtained by measurement using the load cell 5, the moving speed of the bar 45 included in the bar feeder 4 in the transport path, and the new material previously measured. Based on the specific gravity, the conveyance amount of the new material by the bar feeder 4 is calculated.

  As shown in FIG. 5, the hopper 3 includes side walls 32 and 32 that face each other with the bottom plate 31 interposed therebetween. A front wall 32a is attached to the front ends of the side walls 32, 32, and a rear wall 32b wider than the front wall 32a is attached to the rear ends. The bottom plate 31 is located immediately below the bar 45 of the bar feeder 4 that moves on the return orbit. The bottom plate 31 and the side walls 32, 32 of the hopper 3 are installed on the traveling vehicle 21 by support members 33, 33 attached to the traveling vehicle 21. The support members 33 and 33 are located outside the support members 21 a and 21 a of the bar feeder 4. Thus, the hopper 3 and the bar feeder 4 are supported by the traveling vehicle 21 separately. The side walls 32, 32 are attached to the support members 33, 33 so as to be rotatable inward and outward about the rotation shaft 32c. A base end of a tube 35 provided in the cylinder 34 is pivotally supported on the support members 33 and 33. Ends of rods 36 included in the cylinders 34 are pivotally supported on the side walls 32 and 32, respectively. The tube 35 is connected to a hydraulic pump provided in the traveling vehicle 21 via a hose, and receives supply of pressure oil from the hydraulic pump to expand and contract the rod 36 to change the angles of the side walls 32 and 32 with respect to the bottom plate 31. Even in a state where the side wall 32 is rotated to the inner limit as shown by a two-dot chain line in FIG. 5, the bar 45 of the bar feeder 4 is placed on the bottom plate 31 between the lower end of the front wall 32 a and the bottom plate 31. An opening capable of scraping the new material out of the hopper 3 is formed.

  FIG. 7 is a diagram for conceptually explaining the positional relationship between the hopper 3 and the bar feeder 4 described above. In the figure, the same or corresponding parts as those in FIGS.

  As shown in FIG. 5A, two chains 44, 44 spanned between the sprockets 42 a, 42 a at both ends of the driven shaft 42 and the sprockets 43 a, 43 a at both ends of the drive shaft 43 are formed in the casing 41. Circulates in the direction indicated by the arrow in the figure according to the rotation of the drive shaft 43 between the transport track moving right above the sliding plate 41b and the return track passing above the transport track and passing through the hopper 3 To do. Further, as shown in FIG. 4B, the bar 45 of the bar feeder 4 passes directly above the bottom plate 31 of the hopper 3 in the return track, and the sliding plate of the casing 41 located below the hopper 3 in the transfer track. Move just above 41b. That is, the bar feeder 4 has a circulation track of the bar 45 including a transport track for transporting the new material supplied on the slide plate 41 b along the surface of the slide plate 41 b and a return track passing through the hopper 3. .

  Next, the operation of the road regeneration road paving machine 2 according to the present embodiment will be described.

  First, a new asphalt mixture is put into the hopper 3 of the road regeneration road paving machine 2 from the loading platform of the dump truck. The new material thrown into the hopper 3 is deposited on the bottom plate 31 of the hopper 3. The bar 45 of the bar feeder 4 that moves in the circulation path in the return direction scrapes new material on the bottom plate 31 forward of the hopper 3. The scraped new material falls from the front end side of the hopper 3 onto the sliding plate 41b of the casing 41 provided in the bar feeder 4, and is slid by the bar 45 of the bar feeder 4 that moves along the circulation path in the transport direction. It is transported backwards and put into the mixing container of the bag mill mixer. The load applied to the pin 7 inserted into the attachment piece 41a at the rear end portion of the bar feeder 4 is measured using the load cell 5, and based on the obtained measurement value, a new material by the bar feeder 4 is obtained by the control device. A conveyance amount is calculated.

  Further, the recycled material obtained by the machine running in front scraping the road surface is conveyed to the heater by the feeder 23 as described above. The amount of the recycled material obtained from the road surface is calculated based on the measurement value obtained by the laser sensor included in the collection device 22. The recycled material heated by the heater is conveyed to the mixing container of the bag mill mixer by the feeder.

  The amount of new material and recycled material supplied into the mixing container is determined based on the measurement results of the load cell 5 and the laser sensor. The mixing container is supplied with an amount of additive corresponding to the measurement result. The mixture and additives are kneaded and mixed in a mixing vessel to produce a regenerated mixture. The regenerated mixture is sprinkled on the ground by a screw spreader 25a. The front wheels 27a, 27a and the rear wheels 27b, 27b are driven by the engine provided in the traveling vehicle 21, and the road regeneration road paving machine 2 travels on the paved road and is driven by the screed device 26a pulled by the leveling arms 24, 24. The regenerated mixture that has been sprinkled is spread and leveled.

  Thus, according to the road regeneration road pavement machine 2 according to the present embodiment, the new material thrown into the hopper 3 and deposited on the bottom plate 31 passes through the hopper 3 in the return trajectory of the bar feeder 4. 45, it is carried out from the opening of the side walls 32, 32 of the hopper 3 and falls onto the sliding plate 41b, and is transported along the surface of the sliding plate 41b by the bar 45 in the transport track. For this reason, since the new material thrown into the hopper 3 once accumulates on the bottom plate 31 and then falls on the slide plate 41b, the new material falls directly onto the slide plate 41b from a high position as in the prior art. Compared to the above, the impact applied to the sliding plate 41b as the new material falls can be mitigated. In addition, since the hopper 3 is supported by the traveling vehicle 21, it is possible to eliminate factors that cause errors in measurement by the load cell 5 such as the weight of the hopper 3 and the weight of new material accommodated in the hopper 3. Therefore, no matter where the hopper 3 is located immediately above the sliding plate 41b, that is, where the new material is supplied, the load applied to the other end of the sliding plate 41b on which the pin 7 is provided. The load applied to the other end side of the sliding plate 41b can be accurately measured by the load cell 5, and the transport amount of the new material by the bar feeder 4 can be accurately calculated. As a result, as compared with a conventional road regeneration road paving machine using a load cell type weighing bar feeder in which the conveying end of the conveyor must be positioned directly above the fulcrum on one end side by the pin 6 of the sliding plate 41b. Provided is a road regeneration road pavement machine 2 that can increase the degree of freedom of the position of a new material supply location with respect to the plate 41b.

  In the above embodiment, the case where the pavement machine according to the present invention is applied to the road regeneration road pavement machine 2 has been described, but other pavement machines for calculating the conveyance amount of the pavement material supplied from the hopper and conveyed by the bar feeder. The present invention can also be applied to. Even when the present invention is applied to such a paving machine, the same effects as those of the above embodiment can be obtained.

It is a figure which illustrates notionally the positional relationship of the hopper with which the conventional road surface layer reproducing | regenerating apparatus is provided, and the bar feeder which conveys a new material from this hopper. It is a side view showing an outline of composition of a road reproduction road paving machine by one embodiment of the present invention. It is a side view of the load cell type | formula bar feeder which consists of a hopper and bar feeder with which the road regeneration road paving machine shown in FIG. 2 is provided. FIG. 3 is a plan view of a load cell type weighing bar feeder provided in the road regeneration road paving machine shown in FIG. 2. FIG. 3 is a cross-sectional view of a load cell type weighing bar feeder provided in the road regeneration road paving machine shown in FIG. 2. It is a longitudinal cross-sectional view of the load cell type | formula bar feeder provided with the road regeneration road paving machine shown in FIG. It is a figure which illustrates notionally the positional relationship of the hopper with which the road regeneration road paving machine shown in FIG. 2 is provided, and the bar feeder which conveys a new material from this hopper.

Explanation of symbols

DESCRIPTION OF SYMBOLS 2 ... Road regeneration road paving machine 21 ... Traveling vehicle 22 ... Collecting device 23 ... Feeder 24 ... Leveling arm 25a, 25b ... Screw spreader 26a, 26b ... Screed device 3 ... Hopper 31 ... Bottom plate 32 ... Side wall 32a ... Front wall 32b ... Rear Wall 4 ... Bar feeder 41 ... Casing 41a ... Mounting piece 41b ... Sliding plate 42 ... Drive shaft 43 ... Drive shaft 44 ... Chain 45 ... Bar 6, 7 ... Pin

Claims (1)

A traveling vehicle, a hopper supported by the traveling vehicle and containing a pavement material, a sliding plate supported by the traveling vehicle below the hopper and supplied with the pavement material accommodated in the hopper, and the sliding plate A bar feeder that conveys the pavement material supplied on the support plate with a bar provided at a predetermined interval; a measuring means that measures a load applied to the other end side with one end side of the sliding plate as a fulcrum; and Calculating means for calculating the amount of pavement transported by the bar feeder based on the load measured by the measuring means;
The bar feeder has a circulation track of the bar consisting of a transport track for transporting the pavement material supplied on the slide plate along the surface of the slide plate and a return track passing through the hopper,
The hopper is provided with a bottom plate for supporting a pavement material to be accommodated immediately below the return track of the bar.

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