JP5116809B2 - Conveyor device having a structure for preventing leakage and accumulation of mixed materials - Google Patents

Description

  The present invention relates to a conveyor apparatus having a composite material leakage prevention and accumulation prevention structure, and more particularly to a conveyor apparatus having a composite material leakage prevention and accumulation prevention structure capable of high-quality pavement construction. .

  As a conventional road pavement machine, for example, there is an asphalt finisher (tuck paver) as shown in FIGS. 3 (a) and 3 (b), an asphalt finisher 1 includes a hopper 3 provided in the front part of a wheel-traveling self-propelled vehicle 2 for accommodating asphalt mixture, and a chain conveyor from the hopper 3. 4. A spreading screw 5 that spreads the asphalt mixture sent in 4 to the left and right, and an emulsion spreading mechanism (not shown) that spreads the asphalt emulsion provided immediately before the spreading screw 5 and supplied from the emulsion tank 6 on the roadbed. And a screed 7 that spreads the asphalt mixture spread left and right on the roadbed on which the asphalt emulsion is dispersed. The screed 7 is supported by a leveling arm 8 and is extendable in the width direction of the self-propelled vehicle 2.

  The chain conveyor 4 is a parallel chain conveyor in which two unit chain conveyors 4A and 4B are arranged in parallel. On the lower side of the self-propelled vehicle 2, a feeder frame 9 in which a lower cover is not attached is provided, and a front end side rotating shaft 10 and a rear end side rotating shaft are provided on the front end side and the rear end side in the feeder frame 9. 11 is provided. A pair of front end side sprockets 12a and 12b, 12c and 12d for each unit chain conveyor 4A, 4B is attached to the front end side rotating shaft 10, and a pair of rear sprockets 12a and 12b are attached to the rear end side rotating shaft 11, respectively. End side sprockets 13a and 13b, 13c and 13d are attached. A pair of drag chains 14a, 14b are stretched in parallel between the pair of front end side sprockets 12a, 12b and the pair of rear end side sprockets 13a, 13b, and another pair of front end side sprockets. Another pair of drag chains 14c and 14d are stretched in parallel between 12c and 12d and the pair of rear end side sprockets 13c and 13d.

  Between each pair of drag chains 14a and 14b, 14c and 14d, a large number of flight bars 15 are installed at predetermined intervals, respectively, and the plurality of flight bars 15 and each pair of drag chains 14a, 14b and 14c, The unit chain conveyors 4A and 4B for configuring the chain conveyor 4 are configured by 14d. The chain conveyor 4 is rotated by the rear end side rotating shaft 11 being driven by a motor (not shown) via the roller chain 16, and the asphalt mixture loaded in the hopper 3 is used as the flight bar 15 and the conveyor plate 17 is used as the flight plate 15. It is conveyed to the spreading screw 5 side while rubbing.

  Further, as another conventional technique, for example, the following pavement material loading device and spreader machine are known. This spread leveling machine is provided with a lower layer (front side) hopper and an upper layer (rear side) hopper on a self-propelled vehicle, and a front spreading screw that spreads the lower layer asphalt mixture sent from the lower layer hopper with a bar feeder to the left and right. The rear spread screw that spreads the upper asphalt mixture discharged from the upper hopper to the left and right, the front screed that spreads the lower asphalt mixture spread by the front spreading screw, and the rear spread screw And a rear screed for spreading the upper layer asphalt mixture. In one paving operation, two types of asphalt composites, the upper layer and the lower layer, are stacked one above the other and spread on the road surface at the same time.

The loading device is mainly composed of a loading feeder and a receiving hopper. The lower end of the loading frame having a square cross-section and a sealed structure constituting the loading feeder is connected to the receiving hopper so as to face the receiving hopper from an oblique direction, and is connected to the front hopper in the loading frame. Is provided with a discharge opening that can be freely opened and closed, and a discharge end is opened at an upper end corresponding to the rear hopper.

  A lower end rotating shaft and an upper end rotating shaft are provided at the lower end and the upper end in the loading frame, and a large number of flights are spaced at predetermined intervals between the lower end sprocket and the upper end sprocket attached to the both rotating shafts, respectively. An erected endless chain is stretched. The endless chain is rotated by the operation of a drive motor coupled to the upper end side rotation shaft, and the pavement material is transferred from the lower end of the loading frame toward the discharge end formed just above the rear hopper by flight.

  And when putting normal pavement material into the front hopper, open the discharge port, rotate the endless chain by operating the drive motor, carry normal pavement material by flight, and from the discharge port into the front hopper Let fall. Also, when putting pavement material with high wear resistance into the rear hopper, close the discharge port, rotate the endless chain to carry the pavement material with high wear resistance by flight, and drop from the discharge end into the rear hopper (For example, refer to Patent Document 1).

Japanese Patent No. 3471597

  In the prior art shown in FIGS. 3 (a) and 3 (b), a lower cover is not attached to the lower side of the feeder frame, that is, the lower side of the chain conveyor from the viewpoint of weight reduction and simplification of the structure. However, when the asphalt mixture is transported to the spreading screw side by the chain conveyor, a part of the asphalt mixture is returned to the front while adhering to the return flight bar or drag chain, and spills off in the middle. For this reason, there is a concern that the existing road surface may be soiled with the spilled asphalt mixture. In particular, in the cutting overlay construction, that is, in the construction where a predetermined length of the damaged existing road surface is scraped off with a cutting machine and the ordinary asphalt finisher is put in a place where the road surface is concave, as shown in FIG. At the end of the portion 18a (cutting surface), when the front wheel 19 (and the rear wheel of the asphalt finisher 1) rides on the existing road surface 18c, the asphalt mixture is screened off by the shock and vibration of the rotating conveyor chain. End up.

  In addition, in the asphalt finisher with emulsion spraying function, asphalt emulsion is sprayed in front of the spreading screw. In addition, the adhesiveness between the asphalt mixture and the roadbed may be lowered. Furthermore, in the water-impervious pavement, there is a possibility that voids are generated in the water-impervious layer.

  In the prior art described in Patent Document 1, the loading feeder is housed in a loading frame having a rectangular cross section and a sealed structure. By installing a chain conveyor in such a hermetically sealed feeder frame, the above-described problem that the asphalt mixture that is returned to the front while adhering to the flight bar or drag chain spills out is solved. However, if the feeder frame is simply sealed, a portion of the asphalt mixture that is returned to the front while adhering to the flight bar grows by adhering to the lower cover of the frame. Problems such as being pushed up and interfering with the feeder frame occur.

  Therefore, by preventing spilling of asphalt mixture from the feeder frame, it prevents adverse effects on construction, enabling construction of higher quality pavement, and also prevents adhesion and growth of asphalt mixture on the lower cover. Thus, a technical problem to be solved arises in order to prevent a problem that the flight bar interferes with the feeder frame, and the present invention aims to solve this problem.

  The present invention has been proposed in order to achieve the above object, and the invention according to claim 1 is characterized in that the self-propelled asphalt mixture housed in a hopper provided at the front portion of the self-propelled vehicle is conveyed by a chain conveyor. A composite leakage prevention and accumulation prevention structure in which the transported asphalt composite material is spread in the width direction of the self-propelled vehicle with a spreading screw and spread on the roadbed with a screed while being conveyed to the rear side of the vehicle. A conveyor device having a lower cover for covering a lower side of a return stroke side portion of the chain conveyor, and a lower cover for holding the return stroke side portion of the chain conveyor to the lower cover side on the lower cover side Provided is a conveyor device having a leakage prevention and accumulation prevention structure for a composite material in which guides are arranged.

  According to this configuration, since the lower cover is provided, the amount of asphalt mixture adhering to the return flight bar and drag chain is larger than expected when the asphalt mixture is conveyed to the spreading screw side by the chain conveyor. However, the adhering asphalt mixture is returned to the hopper without spilling outside. In particular, when cutting overlay is applied, when the asphalt finisher front wheel 19 (and the rear wheel is the same) rides on the existing road surface 18c at the end of the concave portion of the road surface, etc., the asphalt alignment is caused by shock and vibration of the rotating conveyor chain. The material will not be removed. Even if the lower cover is provided, the return stroke side part of the chain conveyor can be lifted from the lower cover by arranging the anti-lift guides to hold the return stroke side part of the chain conveyor to the lower cover side. It can be suppressed. As a result, it is possible to prevent the asphalt composite material that has returned and adhered to the returning flight bar from adhering to the lower cover and growing.

  The invention according to claim 2 is the invention according to claim 1, wherein in the chain conveyor, a plate-like body for scraping the asphalt mixture spilled on the lower cover is provided between a pair of drag chains. Provided is a conveyor device having a composite material leakage prevention and accumulation prevention structure in which a large number of flight bars are installed at predetermined intervals.

  According to this configuration, the flight bar constituting the chain conveyor is provided with a plate-like body that scrapes the asphalt mixture spilled on the lower cover, so that the asphalt mixture spilled on the lower cover is reliably Returned to Therefore, the asphalt mixture spilled onto the lower cover is reliably prevented from growing on the lower cover.

According to the first aspect of the present invention, by providing the lower cover, the asphalt mixture adhering to the return flight bar can be prevented from spilling to the outside, so that the asphalt mixture is not wasted and spills off. Asphalt composites do not contaminate existing road surfaces. In addition, in the asphalt finisher with emulsion spraying function, asphalt emulsion is sprayed before the spreading screw, so that only the part where the asphalt mixture spilled out can not be sprayed enough. In particular, the adhesion between the asphalt mixture and the roadbed does not deteriorate. Therefore, a higher quality pavement can be constructed. By arranging the raising guides on the lower cover side, it is possible to suppress the lifting from the lower cover of the return stroke side portion of the chain conveyor. Accordingly, there is an advantage that it is possible to prevent the asphalt mixture from adhering to and growing on the lower cover, and to prevent the flight bar from interfering with the feeder frame and the like.

  In addition to the effect of the invention of claim 1, the invention described in claim 2 is further provided with a plate-like body for scraping the asphalt mixture spilled on the lower cover on the flight bar, so that it spills on the lower cover. Asphalt mixture can be reliably returned to the hopper. Thereby, there exists an advantage that the adhesion and growth of asphalt compound material to a lower cover can be stopped more reliably.

The side view of the asphalt finisher which mounts the conveyor apparatus with the leakage prevention and the accumulation prevention structure of the compound material which concerns on the Example of this invention. It is a figure equivalent to the one-side expanded cross section of the part in alignment with the XX line in FIG. 1, (a) is a figure which shows the part of the flight bar of a lower cover, a raising stop guide, and a going-out and return state, (b). The front view and side view which take out and show the flight bar in figure (a), (c) is a figure which shows the flight bar etc. in the prior art as a comparative example of figure (a). It is a figure which shows the conventional asphalt finisher, (a) is a top view which abbreviate | omits the rear side part of a self-propelled vehicle, (b) is a side surface equivalent to the cross section along the YY line in FIG. Figure. The partial side view for demonstrating the problem of the conventional asphalt finisher of FIG.

  The present invention prevents the spilling of asphalt mixture from the feeder frame, thereby preventing adverse effects on the construction, enabling the construction of higher quality pavement, and attaching and growing asphalt mixture on the lower cover In order to achieve the purpose of preventing the flight bar from interfering with the feeder frame, the asphalt mixture housed in the hopper provided at the front of the self-propelled vehicle is connected to the self-propelled vehicle by a chain conveyor. Conveyor having a structure for preventing leakage and preventing accumulation of deposits, transported to the rear side, spread the asphalt mixture transported in the width direction of the self-propelled vehicle with a spreading screw and spread it on the roadbed with screed A lower cover for covering the lower side of the return stroke side portion of the chain conveyor and the lower cover The realized by it has arrayed the up stop guide for pressing the return stroke portion of the chain conveyor to the lower cover side.

  Hereinafter, a preferred embodiment of the present invention will be described with reference to FIGS. 1 and 2 (a), (b), and (c). In FIGS. 1 and 2, (a), (b), and (c), the same or equivalent components as in (a) and (b) of FIG. Redundant description is omitted.

  First, the configuration of the conveyor apparatus having the composite material leakage preventing and accumulation preventing structure according to the present embodiment will be described with reference to FIGS. 1 and 2A, 2B, and 2C. In this embodiment, a lower cover 21 is provided so as to completely cover the lower side of the return stroke side portion of the chain conveyor 4. That is, the feeder frame 9 of the chain conveyor 4 in this embodiment has a lower cover 21 attached below the feeder frame 9 according to the prior art shown in FIG. It has a full cover structure (mixture leakage prevention structure).

Thus, when the lower cover 21 is provided below the return stroke side portion of the chain conveyor 4, the asphalt mixture that has returned and adhered to the return flight bar 22 adheres to and accumulates on the lower cover 21. Defect tendency occurs. For this, as shown in FIG. 2A, by pressing the roller portions of the drag chains 14a to 14d from above, the return stroke side portion of the chain conveyor 4 is pressed to the lower cover 21 side. Raising prevention guides (deposition prevention guides) 23 are arranged in a row.

  FIG. 2B shows details of the configuration of the flight bar 22. The flight bar 22 is provided with a plate-like body 22a. As shown in the figure, the flight bar 22 is upside down when returning, and the plate-like body 22a is provided so as to protrude downward when returning. For this reason, the plate-like body 22a functions so as to scrape the asphalt mixture spilled to the lower cover 21 to the hopper 3 side while facing downward when the flight bar 22 returns.

  Next, the operation of the conveyor apparatus having the composite material leakage prevention and accumulation prevention structure configured as described above will be described. Since the lower cover 21 is provided below the return stroke side portion of the chain conveyor 4, the return flight bar 22 and the drag chains 14a to 14d are transported when the asphalt mixture is conveyed to the spreading screw 5 by the chain conveyor 4. Even if the amount of the asphalt mixture adhering to the surface becomes larger than expected, the adhering asphalt mixture is returned to the hopper 3 without spilling outside.

  In particular, as explained with reference to FIG. 4, even when the asphalt finisher 20 is shocked at the end of the concave portion of the road surface or the like during cutting overlay construction, the asphalt mixture returned to the front is not exposed to the outside. There is no spillage. Further, even if the lower cover 21 is provided, the rise prevention guide 23 for holding the return stroke side portion of the chain conveyor 4 to the lower cover 21 side is arranged, so that the chain conveyor 4 tends to sag. However, the lift of the chain conveyor 4 from the lower cover 21 is suppressed in the return stroke side portion. As a result, it is possible to prevent the asphalt composite material that has adhered and returned to the returning flight bar 22 from adhering to the lower cover 21 and growing.

  The flight bar 22 constituting the chain conveyor 4 has a plate-like body 22a for projecting the asphalt mixture spilled down on the lower cover 21 so as to face downward when returning, so that the flight bar 22 spills down on the lower cover 21. The asphalt composite material is scraped off by the plate-like body 22a and reliably returned to the hopper 3. Accordingly, the asphalt mixture spilled on the lower cover 21 is reliably prevented from growing on the lower cover 21. On the other hand, as shown in the comparative example of FIG. 2C, when the flight bar 15 according to the prior art is used, a large gap is formed between the lower cover 21 and the chain conveyor 4 when the chain conveyor 4 is returned. For this reason, the asphalt mixture adhering to the lower cover 21 cannot be scraped off.

  As described above, in the conveyor apparatus having the leakage preventing and accumulation preventing structure for the composite material according to the present embodiment, the lower cover 21 is provided below the return stroke side portion of the chain conveyor 4 so that the return flight is performed. The asphalt mixture adhering to the bar 22 can be prevented from spilling to the outside, so that the asphalt mixture is not wasted and the existing road surface is not soiled by the spilling asphalt mixture.

  In the asphalt finisher 20 with the emulsion spraying function, the asphalt emulsion is sprayed before the spreading screw 5, so that only the portion where the asphalt mixture has been spilled and the asphalt emulsion cannot be sufficiently sprayed. In particular, the adhesiveness between the asphalt mixture and the roadbed does not deteriorate, and the water-impervious pavement can form a uniform water-impervious layer. Therefore, a higher quality pavement can be constructed.

By arranging the raising stop guides 23 on the lower cover 21 side, the lifting from the lower cover 21 of the return stroke side portion of the chain conveyor 4 can be suppressed. Thereby, adhesion and growth of the asphalt mixture to the lower cover 21 can be stopped, and the trouble that the flight bar 22 interferes with the feeder frame 9 and the like can be prevented.

  The flight bar 22 is provided with a plate-like body 22 a that scrapes the asphalt mixture spilled on the lower cover 21 so that the asphalt mixture spilled on the lower cover 21 can be reliably returned to the hopper 3. Thereby, adhesion and growth of the asphalt mixture to the lower cover 21 can be more reliably prevented.

  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.

  Prevents spilling of asphalt mixture from the feeder frame, preventing adverse effects on construction, enabling construction of higher quality pavement, and preventing asphalt mixture from adhering to and growing on the lower cover It can be widely applied to spreading machines including asphalt finishers with and without emulsion spreading function, where it is essential to prevent the bars from interfering with the feeder frame.

2 Self-propelled vehicle 3 Hopper 4 Chain conveyor 4A, 4B Unit chain conveyor 5 Spreading screw 6 Emulsion tank 7 Screed 8 Leveling arm 9 Feeder frame 10 Front end side rotating shaft 11 Rear end side rotating shaft 12a to 12d Front end side sprocket 13a to 13d Rear end side sprockets 14a to 14d Drag chain 16 Roller chain 17 Conveyor plate 19 Front wheel 20 Asphalt finisher 21 Lower cover 22 Flight bar 22a Plate body 23 Lift stop guide

Claims (2)

The asphalt mixture housed in a hopper provided at the front of the self-propelled vehicle is conveyed to the rear side of the self-propelled vehicle by a chain conveyor, and the conveyed asphalt mixture is spread by a spreading screw. A conveyor device having a leak-proof and accumulation-preventing structure for mixed materials that is spread on the roadbed with a screed while spreading in the direction,
A lower cover that covers the lower side of the return stroke side portion of the chain conveyor is provided, and an upward stop guide is arranged on the lower cover side to hold the return stroke side portion of the chain conveyor to the lower cover side. Conveyor device having a leakage prevention and accumulation prevention structure of the characteristic mixture.   The chain conveyor is configured such that a large number of flight bars, each having a plate-like body for scraping the asphalt mixture spilled on the lower cover, are installed at a predetermined interval between a pair of drag chains. 2. A conveyor apparatus having a composite material leakage prevention and accumulation prevention structure according to claim 1.

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