JPH08229930A - Hopper for ready-mixed concrete - Google Patents

Abstract

PURPOSE: To provide a hopper wherein labors required for cleaning an inner surface of a hopper when operation is ended can be decreased by preventing ready-mixed concrete stuck to the inner surface of the hopper from being cured in the hopper which is mounted on a ready-mixed concrete vehicle or deferred as a deferred type one, and receives the ready-mixed concrete from the ready- mixed concrete vehicle. CONSTITUTION: A clearance is formed between a horizontal shaft type stirring vane 7 provided in a hopper 1 and an inner surface of a lower part. A cylindrical shaft 10 is freely rotatably concentrically fitted to both ends of a shaft 8 of the stirring vane 7. A cleaning tool 13 which cleans the inner surface of the hopper by rotating between the stirring vane 7 and the inner surface of the hopper 1 is fitted to the cylindrical shaft 10. The cleaning tool 13 is intermittently rotated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is mounted on a ready-mixed concrete pump vehicle or is installed in a stationary manner to receive ready-mixed concrete from the ready-mixed concrete vehicle, and is provided with a pressure-feeding device or a stationary-type pressure-feeding device mounted on the freshly-mixed pump vehicle. The present invention relates to a hopper that supplies ready-mixed concrete to a supply destination such as a building under construction.

[0002]

2. Description of the Related Art FIG. 6 is a side view showing a usage example of a hopper. The hopper 1 is mounted on a frame 2a provided at a rear portion of a fresh concrete pump truck 2, and is composed of a pump etc. mounted on the raw concrete pump truck 2. Fresh concrete is supplied to a supply destination 6 such as a building or a civil engineering structure through a hose 5 supported by a support such as an articulated arm 4 by a pressure feeding device 3. Fresh concrete is continuously supplied to the hopper 1 from a fresh concrete car (not shown), and the fresh concrete pump car 2 continuously supplies the fresh concrete to the supply destination 6 so as to prevent uneven curing of the fresh concrete.

In the conventional hopper 1, as shown in the sectional view of FIG. 7, the cross-sectional shape of the lower part of the hopper is formed in a semicircular shape which is concentric with the horizontal shaft 8 of the stirring blade 7, and the stirring blade 7 and the hopper. A gap G is formed between the inner surface and the inner surface of 1. The gap G is, for example, 3 cm when the supply destination 6 is a building, and is 4, for example, in the case of civil engineering work, so as to be slightly larger than the maximum size of the gravel mixed in the ready-mixed concrete.
It is set to 5 cm or the like. As described above, the reason why the gap G is set to be slightly larger than the maximum size of the gravel is that the gravel is sandwiched between the stirring blade 7 and the inner surface of the hopper 1 to rub against each other to damage the inner surface of the hopper 1 and This is to prevent shortening the life of the. If such a gap G is provided, as compared with the case where such a gap G is not provided,
It has been confirmed that the life of the hopper 1 can be extended 6 to 7 times.

[0004]

In the conventional hopper 1 described above, the hardening of the ready-mixed concrete 9 is prevented by continuing to rotate the stirring blade 7 during the construction work (for example, from 8 am to 5 pm). While the fresh concrete 9 is continuously supplied to the supply destination 6, a gap G is provided between the stirring blade 7 and the inner surface of the hopper 1 to extend the life of the hopper.
Since this is provided, the unmixed green concrete layer 9a is generated along the inner surface of the hopper 1. This unstirred layer 9a is hardened during the work depending on the material of the green concrete. This hardening is particularly likely to occur in the summer when the ambient temperature is high, and a great deal of effort is required for cleaning to scrape off the inner surface of the hopper 1 after completion of the work (this cleaning is performed with a cleaning tool having a spatula-shaped steel plate attached to the tip of the iron rod). In some extreme cases, the hardened layer 9 attached to the inner surface of the hopper 1 may not be scraped off without using a hammer and chisel, and a means for eliminating the hardened layer 9a during the work has been demanded. . Even during the work, the upper layer portion of the hardened layer 9a can be peeled off from the inner surface of the hopper 1 by a cleaning tool from above, but the lower layer portion is not visible due to the ready-mixed concrete 9 constantly filled in the hopper 1. Therefore, it is difficult to peel it off.

The present invention meets the above-mentioned demands in the field,
An object of the present invention is to provide a hopper for ready-mixed concrete having a structure that can reduce the labor required for cleaning the inner surface of the hopper at the end of work.

[0006]

In order to achieve the above object, the present invention is mounted on a ready-mixed concrete pump vehicle or installed in a stationary manner, receives ready-mixed concrete from the ready-mixed concrete vehicle, and is provided in the hopper. In a hopper in which a gap is formed between the horizontal shaft type stirring blade and the inner surface of the lower part of the hopper, a cylindrical shaft is concentrically attached to both ends of the shaft of the stirring blade, and the stirring blade and the hopper are attached to the cylindrical shaft. It is characterized in that a cleaning tool for cleaning the inner surface of the hopper is attached by rotating between the inner surface and the inner surface.

[0007]

In the hopper of the present invention, for example, every 30 minutes, the cleaning tool is operated by a manual operation or a timer, so that the green concrete layer near the inner surface of the lower part of the hopper is agitated before being hardened, so that the other concrete in the hopper can be agitated. It mixes with fresh concrete and prevents hardening. Since this cleaning tool is operated intermittently without being operated at all times, damage to the inner surface of the hopper by this cleaning tool is slight, and the hopper due to the gap provided between the stirring blade and the inner surface of the hopper is It does not impair the life prolonging effect.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a perspective view showing the overall construction of a hopper according to the present invention, and FIG. 2 is a sectional view thereof, and between the stirring blade 7 and the lower inner surface of the hopper 1, as in the conventional example, As shown in 2, a gap G of, for example, 3 cm or 4.5 cm, which is slightly larger than the maximum size of the gravel mixed in the fresh concrete, is formed. A cylindrical shaft 10 is concentrically attached to both ends of the shaft 8 of the stirring blade 7, and the cylindrical shaft 10 is supported by bearings 12 attached to a side plate 11 of the hopper 1. The cylindrical shaft 10 may be attached to the shaft 8 of the stirring blade 7 via a bearing such as a ball bearing.

A cleaning tool 13 having a U-shaped frame is attached to the cylindrical shaft 10. As shown in FIG. 2, the cleaning tool 13
Is composed of an arm portion 13a attached at a right angle to the cylindrical shaft 10 and a horizontal bar portion 13b welded between the left and right arm portions 13a. In this embodiment, the cylindrical shaft 10
The two cleaning tools 13 are attached so as to project in directions opposite to each other with respect to the center, whereby the rotational resistances due to the two ready-to-use concretes are balanced and an unreasonable force is applied to the driven cylindrical shaft 10. The cleaning tool 13 is prevented from being generated and smoothly rotated, but the number of the cleaning tool 13 may be one or three or more.

The arm portion 13a has a width such that it can pass through the gap G between the stirring blade 7 and the inner surface of the hopper 1. Further, the arm portion 13a has a width capable of passing through a gap between the end portion of the stirring blade 7 at the end portion and the side plate 11 of the hopper 1.

As shown in FIG. 1, in the present embodiment,
Rotational drive devices 14 and 15 are provided to rotate the stirring blade 7 and the cleaning tool 13 independently. The rotation driving device 14 for the stirring blade 7 includes a sprocket 16 fixed to an end of a shaft 8 and a hopper 1 for the raw concrete pump vehicle 2.
A bracket 17 fixedly or movably mounted on the frame 2a (see FIG. 6) of FIG. 6, a hydraulic motor 19 mounted via a base 18, a sprocket 20 fitted to the output shaft of the hydraulic motor 19, and Sprocket 1
It consists of a chain 21 wound around 6 and 20. Also,
The rotary drive device 15 of the cleaning tool 13 includes a sprocket 22 fixed to the cylindrical shaft 10, a hydraulic motor 23 attached to the bracket 17 via a base 18, and a sprocket 24 fitted to an output shaft of the hydraulic motor 23. And a chain 25 wound around the sprockets 22 and 24.

As described above, in this hopper, the cleaning tool 1 that rotates between the stirring blade 7 and the inner surface of the hopper 1 is used.
Since 3 is attached so as to be able to rotate independently of the stirring blade 7, for example, an operator turns on the control valve operating switch of the hydraulic motor 23 every 30 minutes or 1 hour to intermittently move the cleaning tool 13. By rotating it to
Before the hard concrete layer near the inner surface of the lower part of the hopper 1 is hardened, it can be agitated by the cleaning tool 13 to be mixed with other fresh concrete, and hardening is prevented. Further, since the cleaning tool 13 is operated intermittently without being constantly operated, the stirring blade 7 and the hopper 1 are
The life-prolonging effect of the hopper 1 due to the provision of the gap G therebetween is not impaired.

FIG. 3 is a perspective view showing another embodiment of the present invention,
FIG. 4 is a sectional view of the cleaning tool 13 according to the present embodiment.
An arc-shaped scraping bar portion 13c inclined with respect to the rotation direction of the cleaning tool 13 is provided so that the fresh concrete remaining on the inner surface of the hopper 1 at the end of the work is scraped by the fresh concrete discharge pipe 1a of the hopper 1. is there.

By providing such a scraping bar portion 13c, the fresh concrete remaining on the inner surface of the hopper 1 at the end of the work is automatically scraped by the rotation of the cleaning tool 13, so that the cleaning at the end of the work is further facilitated. It will be easy. The scraping bar portion 13c may be configured without the horizontal bar portion 13b parallel to the shaft 8. However, the scraping bar portion 1c may be provided between the horizontal bar portions 13b.
By installing 3c, the cleaning tool 13 having high strength is realized.

5 (A) and 5 (B) respectively show an electric circuit and a hydraulic circuit for intermittently and automatically operating the cleaning tool 13, and the hydraulic circuit shown in FIG. An electromagnetic valve 27 having a solenoid 27a as a control valve is provided in the hydraulic circuit between the mounted hydraulic pump 26 and the hydraulic motor 23 that rotates the cleaning tool 13,
On the other hand, in the electric circuit shown in (A), a switch 28 that is turned on at the same time when the work of starting the rotation of the stirring blade 7 is started.
And a timer 29 for closing the contact t every 30 minutes for a predetermined time (for example, 30 seconds), and the solenoid 27a of the solenoid valve 27 is excited by closing the contact t. According to this configuration, since the hydraulic motor 23 operates every predetermined time, the cleaning tool 13
It is possible to save the trouble of operating the.

In the above embodiment, the stirring blade 7 and the cleaning tool 13 are rotated by separate hydraulic motors 19 and 23, but the rotary drive device of the cleaning tool 13 is eliminated.
The rotating force of the shaft of the stirring blade 7 is applied to the cleaning tool 13 via the clutch.
It may be transmitted to the cylindrical shaft 10.

[0017]

According to the first aspect of the present invention, since the cleaning tool for cleaning the space between the stirring blade and the inner surface of the hopper is provided, by intermittently rotating the cleaning tool, the green concrete layer near the inner surface of the lower part of the hopper is provided. Also, since it is agitated before being hardened and mixed with other ready-mixed concrete to prevent hardening, the labor required for cleaning the inner surface of the hopper at the end of the work can be greatly reduced. In addition, this cleaning tool does not always operate,
Since it is operated intermittently, the life extension effect of the hopper due to the provision of the gap between the stirring blade and the inner surface of the hopper is not impaired.

According to the second aspect, since the cleaning tool automatically operates intermittently, it is possible to save labor for operating the cleaning tool.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a hopper according to the present invention.

FIG. 2 is a cross-sectional view of a hopper of this embodiment.

FIG. 3 is a perspective view showing another embodiment of the hopper according to the present invention.

4 is a sectional view of the hopper of the embodiment of FIG.

5A and 5B are an electric circuit and a hydraulic circuit for automatically operating the cleaning tool, respectively.

FIG. 6 is a side view showing the ready-mixed concrete pump vehicle in a working state.

7 is a cross-sectional view of a conventional hopper used in the ready-mixed pump vehicle of FIG.

[Explanation of symbols]

1: hopper, 1a: discharge pipe, 2: raw concrete pump car,
7: stirring blade, 8: shaft, 10: cylindrical shaft, 13: cleaning tool,
13a: arm part, 13b: horizontal bar part, 13c: scraping bar part, 14: stirring blade rotary drive device, 15: cleaning tool rotary drive device, 16, 18, 20, 22: sprocket, 17: bracket, 19, 23: hydraulic motor, 2
1, 25: chain, 26: hydraulic pump, 27: solenoid valve, 27a: solenoid, 28: switch, 29: timer, t: timer contact

Claims (2)

[Claims] 1. Installed in a ready-mixed concrete pump car or installed in a stationary manner, receiving ready-mixed concrete from the ready-mixed car,
And a hopper in which a gap is formed between a horizontal shaft type stirring blade provided in the hopper and the inner surface of the lower portion of the hopper, wherein a cylindrical shaft is rotatably attached concentrically to both ends of the shaft of the stirring blade. A hopper for ready-mixed concrete, characterized in that a cleaning tool for cleaning the inner surface of the hopper by rotating between the stirring blade and the inner surface of the hopper is attached to the shaft. 2. The cleaning concrete according to claim 1, wherein the cleaning tool is provided with a scraping bar portion that slants against a rotation direction of the cleaning tool to scrape residual fresh concrete toward a discharge pipe. hopper.