Concrete stacker

Abstract

To provide a concrete stacker capable of lengthening the service life of a belt while restraining leakage of a concrete material from a belt conveyor.SOLUTION: A concrete stacker comprises a hopper (20a, 20b) to which a concrete material is supplied and having an opening (20c), a belt conveyor (32) disposed below the opening (20c) for conveying the concrete material, and a scraper (21) disposed at the opening (20c) and in contact with a belt (32a) of the belt conveyor (32), wherein the width of the scraper (21) varies along the conveying direction of the belt conveyor (32).SELECTED DRAWING: Figure 5

Description

[Technical Field]

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

[0002] Conventionally, concrete stackers that transport concrete material using a belt conveyor attached to a vehicle have been used as a device for supplying concrete material when constructing concrete pavements for roads, etc. (See, for example, Patent Document 1.) In such conventional concrete stackers, the belt conveyor has an inclined surface that transports the concrete material to a position higher than the hopper, and supplies the concrete material to other belt conveyors or other construction vehicles. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2000-257012 Summary of the Invention [Problem to be solved by the invention]

[0004] In the conventional concrete stacker described above, the belt is positioned horizontally below the hopper, which can cause the fluid concrete material to spread out and fall to both sides in the width direction. To address this issue, it has been proposed to install a scraper at the opening of the hopper that contacts the belt's conveying surface to prevent concrete material from leaking through the gap between the scraper and the belt. However, in conventional concrete stackers, the scraper's contact with the belt makes the belt surface susceptible to deterioration and breakage due to friction, shortening the belt's lifespan.

[0005] Therefore, the present invention has been developed in consideration of the above-mentioned conventional problems, and aims to provide a concrete stacker that can prevent concrete material from leaking from the belt conveyor while extending the life of the belt. [Means for solving the problem]

[0006] In order to solve the above problems, the concrete stacker of the present invention comprises a hopper having an opening into which concrete material is supplied, a belt conveyor provided below the opening for transporting the concrete material, and a scraper provided in the opening for contacting the belt of the belt conveyor, the scraper having a width that varies along the transport direction of the belt conveyor.

[0007] In the concrete stacker of the present invention, the scraper installed at the opening of the hopper has a width that changes along the conveying direction of the belt conveyor, which reduces the frequency with which the conveying surface of the belt comes into contact with the scraper, making it possible to extend the life of the belt while suppressing leakage of concrete material from the belt conveyor.

[0008] 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] In one aspect of the present invention, the scrapers are provided on both sides of the belt in the width direction, and the interval between the scrapers increases along the conveying direction of the belt conveyor.

[0010] In one aspect of the present invention, the belt conveyor includes a horizontal conveying section below the opening, and an inclined conveying section that extends from the horizontal conveying section and is inclined relative to the horizontal conveying section. [Effects of the Invention]

[0011] The present invention can provide a concrete stacker that can extend the life of the belt while suppressing leakage of concrete material from the belt conveyor. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a schematic diagram showing an example of a concrete stacker 100 according to a first embodiment. [Figure 2] 2 is a schematic side view showing the positional relationship between a hopper 20, a scraper 21, and a belt conveyor 30 in a concrete stacker 100. FIG. [Figure 3] 5 is a schematic cross-sectional view illustrating contact between the scraper 21 and the conveying surface 32a. FIG. [Figure 4] 10 is a schematic plan view illustrating contact between the scraper 21 and the conveying surface 32a. FIG. [Figure 5] FIG. 2 is a schematic perspective view illustrating contact between a scraper 21 and a conveying surface 32a. [Figure 6] 10 is a schematic plan view illustrating contact between a scraper 21 and a conveying surface 32a in a concrete stacker 100 according to a second embodiment. FIG. DETAILED DESCRIPTION OF THE INVENTION

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

[0014] The vehicle unit 10 is the vehicle portion that drives the concrete stacker 100. The vehicle unit 10 is equipped with a hopper 20 at the front, and belt conveyors 30 and 40 extending from the bottom of the hopper 20 to the rear. The configuration of the vehicle unit 10 is not limited, and it moves on the construction surface by driving drive wheels using a power source such as an internal combustion engine or an electric motor. The vehicle unit 10 is also equipped with a driver's seat for a worker, and a control device for controlling the operation 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 compartment that receives the poured concrete material. A belt conveyor 30 is provided from below 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 transports the concrete material supplied into the hopper 20 to the belt conveyor 40. The belt conveyor 40 transports 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. While FIG. 1 shows an example in which the belt conveyor 40 is provided in the concrete stacker 100, if the belt conveyor 30 supplies concrete material to another vehicle or device, the belt conveyor 40 may not be provided.

[0016] Fig. 2 is a schematic side view showing the positional relationship between the hopper 20, scraper 21, and belt conveyor 30 in the concrete stacker 100. As shown in Fig. 2, the belt conveyor 30 is equipped with a horizontal conveying section 30a located below the hopper 20, and an inclined conveying section 30b that extends from the rear of the horizontal conveying section 30a and is inclined. The belt conveyor 30 is provided with a belt that is continuous with the horizontal conveying section 30a and the inclined conveying section 30b, and tension is applied to the belt in the width direction 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 to the rear of the vehicle section 10 on a conveying surface 32a. The horizontal conveying section 30a and the conveying surface 32a are preferably maintained in a substantially horizontal direction when the vehicle section 10 is parked on a horizontal road surface, but may also be inclined in the front-to-rear direction to an extent that prevents the concrete material from leaking.

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

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

[0020] 3 is a schematic cross-sectional view illustrating contact between scraper 21 and conveying surface 32a. As shown in FIG. 3, hopper 20 has wall portions 20a and bottom plate portion 20b on both sides of belt conveyor 30, and an opening 20c is provided in the center of bottom plate portion 20b. Conveying surface 32a of belt conveyor 30 is exposed in opening 20c. Scraper 21 is also attached to opening 20c. In hopper 20, wall portions 20a, bottom plate portion 20b, and conveying surface 32a form a space having a predetermined capacity, and concrete material introduced into this space is temporarily stored in hopper 20.

[0021] The wall portion 20a is a plate-like portion erected on the outer side of the bottom plate portion 20b in the front-rear direction. The wall portion 20a is preferably formed integrally with the bottom plate portion 20b, and when the inclination angle of the bottom plate portion 20b is changed by a hopper cylinder (not shown), the wall portion 20a also moves together with the inclination of the bottom plate portion 20b.

[0022] The bottom plate portions 20b are plate-shaped portions provided on both sides of the belt conveyor 30 and constituting the bottom surface of the hopper 20. The inclination angle of the bottom plate portion 20b relative 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 poured into the hopper 20, the bottom plate portion 20b forms a horizontal surface similar to the conveying surface 32a. When the concrete material in the hopper 20 is moved toward the conveying surface 32a, the wall portion 20a side of the bottom plate portion 20b is raised to form an inclined surface such that the opening 20c side is lowered.

[0023] The scraper 21 has an attachment 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, one side of the attachment portion 21a of the scraper 21 is fixed at the height of the bottom plate portion 20b and inclined toward the center in the width direction of the belt conveyor 30. The other side of the attachment portion 21a of the scraper 21 is bent and contacts the conveying surface 32a of the belt conveyor 30, and the portion that contacts the conveying surface 32a serves as 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 over a predetermined area. This prevents the concrete material supplied to the opening 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. In addition, tension is applied to the belt of the belt conveyor 30 in the width direction by a tension member (not shown), and the conveying surface 32a is held by the chain portions 33 and the sprocket 31, suppressing deflection that occurs in the conveying surface 32a.

[0025] Fig. 4 is a schematic plan view illustrating contact between the scraper 21 and the conveying surface 32a. In Fig. 4, the left side of the drawing is the front of the concrete stacker 100, and the right side is the rear. The concrete material supplied to the hopper 20 reaches the belt (conveying surface 32a) of the belt conveyor 30 through the opening 20c and is conveyed from left to right in the drawing as the belt conveyor 30 is driven. Fig. 4 shows an example in which the distance 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 also 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 in the opening 20c, and has a constant width. Here, an example in which 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. Furthermore, the contact surface 21b of the scraper 21 varies 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, when the front end of the vehicle portion 10 is W1 and the rear end is W2, the distance between the two scrapers 21 provided on both sides of the opening 20c is wider at the rear end than at the front end, becoming W1. <W2となっている。

[0027] Fig. 5 is a schematic perspective view illustrating contact between scraper 21 and conveying surface 32a. Fig. 5 shows a state in which bottom plate portion 20b of hopper 20 is tilted toward opening 20c by a hopper cylinder (not shown). Hopper 20 also has plate portion 20d in front of opening 20c, and an outlet 20e in the rear wall.

[0028] As shown in Figure 5, by inclining the outside of bottom plate portion 20b so that it is higher, the concrete material temporarily stored in hopper 20 flows toward opening 20c according to the inclination of bottom plate portion 20b. The concrete material that reaches opening 20c is transported rearward while loaded on conveying surface 32a as belt conveyor 30 operates, and is then discharged from hopper 20 through discharge outlet 20e. The concrete material discharged from discharge outlet 20e reaches a higher position at the rear by conveying surface 32b of inclined conveying portion 30b, and is then supplied to belt conveyor 40.

[0029] As the belt is sequentially fed backward on the conveying surface 32a of the belt conveyor 30, the belt surface of the conveying surface 32a slides while in contact with the contact surface 21b of the scraper 21. If the concrete material loaded on the conveying surface 32a gets between the contact surface 21b and the belt surface, the concrete material is pressed against the belt surface by the contact surface 21b, and if the belt surface slides in this state, friction increases, accelerating the wear and deterioration of the belt.

[0030] However, in the concrete stacker 100 of this embodiment, the width of the contact surface 21b narrows along the conveying direction, and the surface of the belt exposed through the opening 20c widens along the conveying direction, preventing concrete material from getting between the contact surface 21b and the belt surface. Furthermore, the position of contact between the belt surface of the belt conveyor 30 and the edge of the contact surface 21b changes depending on the position in the conveying direction within the hopper 20, so the position where friction occurs with the edge of the contact surface 21b also changes with the rotation of the belt. This reduces the amount of concrete material that gets between the contact surface 21b and the belt surface, and friction caused by the edge of the contact surface 21b, thereby extending the life of the belt of the belt conveyor 30.

[0031] As described above, in the concrete stacker 100 of this 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, thereby reducing the frequency with which the conveying surface 32a of the belt comes into contact with the scraper 21, thereby making it possible to extend the life of the belt while suppressing leakage of concrete material from the belt conveyor 30.

[0032] (Second embodiment) Next, a second embodiment of the present invention will be described with reference to Fig. 6. Descriptions of content that overlap with the first embodiment will be omitted. Fig. 6 is a schematic plan view illustrating contact between the scraper 21 and the conveying surface 32a in a concrete stacker 100 according to this embodiment. This embodiment is similar to the first embodiment in that the width of the contact surface 21b of the scraper 21 changes along the conveying direction, but differs from the first embodiment in that the change in width is not at a constant rate.

[0033] As shown in Figure 6, the width of the contact surface 21b of the scraper 21 changes along the conveying direction of the belt conveyor 30, and the rate of change in width also changes, forming a curve. In addition, the width is wider at the front (left in the figure) of the vehicle part 10 and narrower at the rear (right in the figure). As a result, when the front end of the vehicle part 10 is W1 and the rear end is W2, the distance between the two scrapers 21 provided on both sides of the opening 20c is wider at the rear end than at the front end, W1. <W2となっている。

[0034] In the concrete stacker 100 of this 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, thereby reducing the frequency with which the conveying surface 32a of the belt comes into contact with the scraper 21, thereby making it possible to extend the life of the belt while suppressing leakage of concrete material from the belt conveyor 30.

[0035] The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope of 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 symbols]

[0036] 100...Concrete stacker 10...Vehicle section 20...Hopper 30, 40... Belt conveyor 20a...Wall part 20b…Bottom plate part 20c…opening 20d…Plate part 20e…Export exit 21...Scraper 21a...Mounting part 21b…Contact surface 30a...Horizontal conveying section 30b...Inclined conveying section 31...Sprocket 32a, 32b...Transport surface 33...Chain section

Claims

1. a hopper into which the concrete material is supplied and having an opening; a belt conveyor provided below the opening for transporting the concrete material; a scraper provided in the opening and contacting the belt of the belt conveyor, A concrete stacker characterized in that the width of the scraper varies along the conveying direction of the belt conveyor.

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

3. 2. The concrete stacker according to claim 1, The scrapers are provided on both sides of the belt in the width direction, A concrete stacker characterized in that the intervals between the scrapers increase along the conveying direction of the belt conveyor.

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.

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