Concrete Stacker

Abstract

Provided is a concrete stacker capable of achieving a long service life of a belt while suppressing leakage of concrete material from a belt conveyor. 【Solution means】A hopper (20a, 20b) having an opening (20c) to which a concrete material is supplied, a belt conveyor (32) provided below the opening (20c) for conveying the concrete material, and a scraper (21) provided at the opening (20c) and contacting the belt (32a) of the belt conveyor (32). The scraper (21) is a concrete stacker whose width changes along the conveying direction of the belt conveyor (32).

Description

Technical Field

[0001] The present invention relates to a concrete stacker.

Background Art

[0002] Conventionally, as a device for supplying concrete materials during the construction of concrete pavements such as roads, a concrete stacker that conveys concrete materials by a belt conveyor provided on a vehicle has been used (see, for example, Patent Document 1). In such a conventional concrete stacker, an inclined surface is provided on the belt conveyor, and the concrete material is conveyed to a position higher than the position of the hopper, and the concrete material is supplied to another belt conveyor or another construction vehicle.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the above-described conventional concrete stacker, the belt is horizontally arranged below the hopper, and there is a possibility that the fluid concrete material spreads and falls to both sides in the width direction. Therefore, it has also been proposed to provide a scraper that contacts the conveying surface of the belt at the opening of the hopper so that the concrete material does not leak from the gap between the scraper and the belt. However, in the conventional concrete stacker, since the scraper is in contact with the belt, the surface of the belt is likely to deteriorate and break due to friction, and there is a problem that the life of the belt is shortened.

[0005] Therefore, the present invention has been made in view of the above-described conventional problems, and an object thereof is to provide a concrete stacker capable of achieving a long life of the belt while suppressing leakage of the concrete material from the belt conveyor.

Means for Solving the Problem

[0006] In order to solve the above problems, the concrete stacker of the present invention includes a hopper having an opening into which a concrete material is supplied, a belt conveyor provided below the opening for conveying the concrete material, and a scraper provided at the opening and contacting the belt of the belt conveyor. The scraper is characterized in that its width changes along the conveying direction of the belt conveyor.

[0007] In such a concrete stacker of the present invention, the scraper provided at the opening of the hopper has a width that changes along the conveying direction of the belt conveyor, so that the frequency of contact between the conveying surface of the belt and the scraper can be reduced. While suppressing the leakage of the concrete material from the belt conveyor, it is possible to extend the service life of the belt.

[0008] Also, in one aspect of the present invention, the belt conveyor includes a tension member that applies tension in the width direction of the belt, a chain portion provided along the belt, and a sprocket that drives the chain portion.

[0009] Also, in one aspect of the present invention, the scrapers are provided on both sides in the width direction of the belt, and the interval between the scrapers expands along the conveying direction of the belt conveyor.

[0010] Also, in one aspect of the present invention, the belt conveyor includes a horizontal conveying portion below the opening and an inclined conveying portion extending from the horizontal conveying portion and inclined with respect to the horizontal conveying portion.

Effects of the Invention

[0011] The present invention can provide a concrete stacker capable of extending the service life of the belt while suppressing the leakage of the concrete material from the belt conveyor.

Brief Description of the Drawings

[0012]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Mode for Carrying Out the Invention

[0013] (First Embodiment) Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The same or equivalent components, members, and processes shown in each drawing are denoted by the same reference numerals, and redundant explanations will be omitted as appropriate. FIG. 1 is a schematic diagram showing an example of the concrete stacker 100 according to the present embodiment. As shown in FIG. 1, the concrete stacker 100 includes a vehicle unit 10, a hopper 20, and belt conveyors 30 and 40.

[0014] The vehicle section 10 is the vehicle part that drives the concrete stacker 100. The vehicle section 10 is provided with a hopper 20 at the front, and a belt conveyor 30 and a belt conveyor 40 are provided from the lower part of the hopper 20 to the rear. The configuration of the vehicle section 10 is not limited, and it moves on the construction surface by driving the drive wheels using a power source such as an internal combustion engine or an electric motor. Also, a driver's seat for an operator to board is provided in the vehicle section 10, and a control device for controlling the operations of the hopper 20 and the belt conveyors 30 and 40 may be arranged around the driver's seat.

[0015] The hopper 20 is a section that receives the input concrete material. A belt conveyor 30 is provided from the lower part of the hopper 20 to the rear of the vehicle section 10. The belt conveyor 30 is provided from below the hopper 20 to the rear of the vehicle section 10, and is a part that conveys the concrete material supplied into the hopper 20 to the belt conveyor 40. The belt conveyor 40 is a part that conveys the concrete material supplied from the belt conveyor 30 to the vicinity of the concrete finisher at the construction site. Details of the hopper 20 and the belt conveyors 30 and 40 will be described later. Fig. 1 shows an example in which the concrete stacker 100 is provided with a belt conveyor 40, but when supplying the concrete material from the belt conveyor 30 to another vehicle or device, it may be configured without the belt conveyor 40.

[0016] Fig. 2 is a schematic side view showing the positional relationship between the hopper 20, the scraper 21, and the belt conveyor 30 in the concrete stacker 100. As shown in Fig. 2, the belt conveyor 30 includes a horizontal conveying section 30a located below the hopper 20, and an inclined conveying section 30b that extends and inclines from the rear of the horizontal conveying section 30a. Also, the belt conveyor 30 is provided with a belt continuous to the horizontal conveying section 30a and the inclined conveying section 30b, and tension is applied in the width direction of the belt by a tension member (not shown).

[0017] The horizontal conveying section 30a is provided below the hopper 20 and is a section that conveys the concrete material rearward of the vehicle section 10 on the conveying surface 32a. The horizontal conveying section 30a and the conveying surface 32a are preferably held in a substantially horizontal direction when the vehicle section 10 is parked on a horizontal road surface, but may be inclined in the front-rear direction to such an extent that the concrete material does not leak.

[0018] The inclined conveying section 30b is bent and inclined from the rear end of the horizontal conveying section 30a, and is a section that conveys the concrete material rearward of the vehicle section 10 on the conveying surface 32b and conveys it to a position higher than the conveying surface 32a. Further, the rear end of the inclined conveying section 30b extends onto the belt conveyor 40, and the concrete material conveyed to the rear end of the inclined conveying section 30b falls onto the belt conveyor 40.

[0019] As will be described later, the belt of the belt conveyor 30 is rotationally driven by a plurality of sprockets 31, and the concrete material is conveyed by the movement of the conveying surfaces 32a and 32b in the horizontal conveying section 30a and the inclined conveying section 30b. Further, a scraper 21 is provided along the conveying direction of the belt conveyor 30 between the conveying surface 32a of the belt conveyor 30 and the hopper 20.

[0020] FIG. 3 is a schematic cross-sectional view for explaining the contact between the scraper 21 and the conveying surface 32a. As shown in FIG. 3, the hopper 20 is provided with wall portions 20a and a bottom plate portion 20b on both sides of the belt conveyor 30, and an opening 20c is provided at the center of the bottom plate portion 20b. The conveying surface 32a of the belt conveyor 30 is exposed in the opening 20c. Further, a scraper 21 is attached to the opening 20c. A space having a predetermined capacity is formed in the hopper 20 by the wall portion 20a, the bottom plate portion 20b, and the conveying surface 32a, and the concrete material introduced into the space is temporarily stored in the hopper 20.

[0021] The wall portion 20a is a plate-shaped portion erected outward along the front-rear direction of the bottom plate portion 20b. The wall portion 20a is preferably integrally formed with the bottom plate portion 20b. When the inclination angle of the bottom plate portion 20b is changed by a hopper cylinder (not shown), the wall portion 20a also moves along with the inclination of the bottom plate portion 20b.

[0022] The bottom plate portion 20b is a plate-shaped portion provided on both sides of the belt conveyor 30 and constituting the bottom surface of the hopper 20. Further, the inclination angle of the bottom plate portion 20b with respect to the conveying surface 32a of the belt conveyor 30 can be changed by a hopper cylinder (not shown). As an example, when concrete material is charged into the hopper 20, the bottom plate portion 20b constitutes a horizontal plane similar to the conveying surface 32a. Further, when moving the concrete material in the hopper 20 toward the conveying surface 32a, an inclined surface is formed such that the side of the bottom plate portion 20b on the wall portion 20a side rises and the opening portion 20c side becomes lower.

[0023] The scraper 21 has a mounting portion 21a attached to the bottom plate portion 20b and a contact surface 21b that contacts the conveying surface 32a of the belt conveyor 30. In the example shown in FIG. 3, for the scraper 21, one side of the mounting portion 21a is fixed to the height of the bottom plate portion 20b and is inclined toward the center in the width direction of the belt conveyor 30. Further, the other side of the mounting portion 21a of the scraper 21 contacts the conveying surface 32a of the belt conveyor 30 and is bent, and the portion in contact with the conveying surface 32a is the contact surface 21b. As shown in FIG. 3, the scraper 21 fills the gap between the hopper 20 and the belt conveyor 30, and the contact surface 21b contacts the conveying surface 32a with a predetermined area. Thereby, it is possible to prevent the concrete material supplied to the opening portion 20c from flowing and leaking from both sides of the belt conveyor 30.

[0024] The belt conveyor 30 has chain portions 33 attached along both sides of the belt, and the chain portions 33 are engaged with the teeth of the sprocket 31. Further, a tension is applied in the width direction to the belt of the belt conveyor 30 by a tension member (not shown), and the conveying surface 32a is held by the chain portions 33 and the sprocket 31, suppressing the deflection occurring on the conveying surface 32a.

[0025] FIG. 4 is a schematic plan view for explaining the contact between the scraper 21 and the conveying surface 32a. In FIG. 4, the left side in the figure is the front of the concrete stacker 100, and the right side in the figure is the rear. The concrete material supplied to the hopper 20 reaches the belt (conveying surface 32a) of the belt conveyor 30 from the opening 20c and is conveyed from the left to the right in the figure as the belt conveyor 30 is driven. FIG. 4 shows an example where the interval between the bottom plate portions 20b provided on both sides of the belt conveyor 30 (the width of the opening 20c) is constant along the conveying direction, but the width of the opening 20c may vary.

[0026] As shown in FIG. 4, the attachment portion 21a of the scraper 21 is attached along the edge of the bottom plate portion 20b within the opening 20c, and its width is constant. Here, an example where the width of the attachment portion 21a is constant is shown, but the width of the attachment portion 21a may vary along the conveying direction of the belt conveyor 30. Further, the contact surface 21b of the scraper 21 changes in width at a constant rate along the conveying direction of the belt conveyor 30, being wider at the front (left in the figure) of the vehicle portion 10 and narrower at the rear (right in the figure). As a result, the interval between the two scrapers 21 provided on both sides of the opening 20c is widened at the rear end compared to the front end when the front end of the vehicle portion 10 is W1 and the rear end is W2, such that W1 < W2.

[0027] FIG. 5 is a schematic perspective view for explaining the contact between the scraper 21 and the conveying surface 32a. FIG. 5 shows a state where the bottom plate portion 20b of the hopper 20 is inclined in the direction of the opening 20c by a hopper cylinder (not shown). Further, the hopper 20 is provided with a plate portion 20d in front of the opening 20c, and a discharge port 20e is provided on the rear wall surface.

[0028] As shown in FIG. 5, by inclining the outside of the bottom plate portion 20b to be higher, the concrete material temporarily stored in the hopper 20 flows in the direction of the opening portion 20c along the inclination of the bottom plate portion 20b. The concrete material that has reached the opening portion 20c is conveyed rearward in a state of being loaded on the conveying surface 32a along with the operation of the belt conveyor 30, and is carried out of the hopper 20 from the carry-out port 20e. The concrete material carried out from the carry-out port 20e reaches a higher position rearward by the conveying surface 32b of the inclined conveying portion 30b and is supplied to the belt conveyor 40.

[0029] On the conveying surface 32a of the belt conveyor 30, since the belt is sequentially sent rearward, the belt surface of the conveying surface 32a slides in a state of contacting the contact surface 21b of the scraper 21. At this time, when the concrete material loaded on the conveying surface 32a enters between the contact surface 21b and the belt surface, the concrete material is pressed against the belt surface by the contact surface 21b, and when the belt surface slides in this state, the friction increases, and the wear and deterioration of the belt progress.

[0030] However, in the concrete stacker 100 of the present embodiment, the width of the contact surface 21b becomes narrower along the conveying direction, and the surface of the belt exposed from the opening portion 20c expands along the conveying direction. Therefore, it is possible to suppress the concrete material from entering between the contact surface 21b and the belt surface. Further, on the belt surface of the belt conveyor 30, the position where it contacts the edge of the contact surface 21b changes according to the position in the conveying direction in the hopper 20. Therefore, the position where friction occurs between the contact surface 21b and the edge also changes with the rotation of the belt. Thereby, it is possible to reduce the concrete material that has entered between the contact surface 21b and the belt surface and the friction caused by the edge of the contact surface 21b, and to extend the life of the belt of the belt conveyor 30.

[0031] As described above, in the concrete stacker 100 of the present embodiment, the scraper 21 provided at the opening 20c of the hopper 20 has a width that changes along the conveying direction of the belt conveyor 30, so that the frequency of contact between the conveying surface 32a of the belt and the scraper 21 can be reduced, and while suppressing the leakage of the concrete material from the belt conveyor 30, it is possible to extend the life of the belt.

[0032] (Second Embodiment) Next, a second embodiment of the present invention will be described with reference to FIG. 6. Descriptions of the content overlapping with the first embodiment will be omitted. FIG. 6 is a schematic plan view for explaining the contact between the scraper 21 and the conveying surface 32a in the concrete stacker 100 according to the present embodiment. In the present embodiment, the contact surface 21b of the scraper 21 is the same as that in the first embodiment in that the width changes along the conveying direction, but is different from the first embodiment in that the rate of change in width is not constant.

[0033] As shown in FIG. 6, the contact surface 21b of the scraper 21 has a width that changes along the conveying direction of the belt conveyor 30, and the rate of change in width also changes to form a curve. Also, the width is wide in the front (left in the figure) of the vehicle part 10 and narrow in the rear (right in the figure). As a result, the distance between the two scrapers 21 provided on both sides of the opening 20c expands at the rear end rather than the front end when the front end of the vehicle part 10 is W1 and the rear end is W2, and W1 < W2.

[0034] Also in the concrete stacker 100 of the present embodiment, the scraper 21 provided at the opening 20c of the hopper 20 has a width that changes along the conveying direction of the belt conveyor 30, so that the frequency of contact between the conveying surface 32a of the belt and the scraper 21 can be reduced, and while suppressing the leakage of the concrete material from the belt conveyor 30, it is possible to extend the life of the belt.

[0035] The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope indicated in the claims. Embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included in the technical scope of the present invention.

Explanation of Reference Numerals

[0036] 100... Concrete stacker 10... Vehicle part 20... Hopper 30, 40... Belt conveyor 20a... Wall part 20b... Bottom plate part 20c... Opening 20d... Plate part 20e... Discharge port 21... Scraper 21a... Mounting part 21b... Contact surface 30a... Horizontal conveying part 30b... Inclined conveying part 31... Sprocket 32a, 32b... Conveying surface 33... Chain part

Claims

1. a hopper into which the concrete material is supplied and having an opening; A belt conveyor is provided below the opening and transports the concrete material; a scraper provided in the opening and contacting the belt of the belt conveyor; The scrapers are provided on both sides of the belt in a width direction, A concrete stacker characterized in that the scrapers have a width that changes along the conveying direction of the belt conveyor, and the surface of the belt exposed between the scrapers expands along the conveying direction.

2. 2. A concrete stacker according to claim 1, The concrete stacker is characterized in that the belt conveyor includes a tension member that applies tension in the width direction of the belt, a chain portion that is arranged along the belt, and a sprocket that drives the chain portion.

3. 2. A concrete stacker according to claim 1, A concrete stacker characterized in that the width of the contact surface of the scraper that comes into contact with the belt narrows along the conveying direction.

4. A concrete stacker according to any one of claims 1 to 3, A concrete stacker characterized in that the belt conveyor has a horizontal conveying section below the opening, and an inclined conveying section extending from the horizontal conveying section and inclined relative to the horizontal conveying section.

Images