JPH11190273A - Vertical suction type concrete force-feed pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vertical suction type concrete force-feed pump which can deal with even concrete with a small slump value and concrete containing aggregate with a large maximum grain size, while avoiding separation of the concrete during force-feeding. SOLUTION: In the bottom wall of a hopper 12 storing concrete to be force- fed, through openings 16, 18 are formed in symmetrical positions each spaced from the centerline V-V of the bottom wall by a predetermined distance (d), and a pair of concrete cylinders 20, 22 extending away from the bottom wall and fixed in place are provided. A pipe 24 with which upper and lower openings are communicated is freely rotatably placed within the hopper 12 with the centerline of the upper opening 24a aligned with the centerline V-V of the bottom wall, and with the centerline of the lower opening 24b rotated at a distance (d) from the centerline V-V. A drive mechanism which positions the lower opening immediately above the through openings 16, 18 alternately so that the lower opening can be aligned with the through openings 16, 18 is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates generally to concrete pumps, and more particularly, to vertical suction concrete pumps.

[0002]

2. Description of the Related Art Ready mixed concrete (hereinafter referred to as "ready mixed concrete")
The method of pumping concrete by simply pumping it through a transport pipe can freely transport concrete in the horizontal and vertical directions, which can save labor and increase efficiency in construction work. Widely used in the field. Concrete pumps used for pumping concrete include a mechanical pump that pumps concrete mechanically by an electric motor using a crankshaft, a piston pump that pumps concrete using a hydraulic piston, and two rollers attached to a rotating roller. A squeeze pump for extruding concrete is known, but a large-scale construction site generally uses a piston pump having a large pumping capacity.

[0003]

However, in the conventional piston type concrete pump as shown in FIG. 7, the hydraulic cylinder is disposed substantially parallel to the hopper, and the concrete is provided at the lower part of the hopper. Because it is configured to be sucked into the hydraulic cylinder through the suction valve from the opened opening, it can not sufficiently cope with hard concrete with a small slump value or concrete containing aggregate with a large maximum particle size There was a problem that.
In addition, since concrete is sucked by the hydraulic cylinder, only the mortar having a low specific gravity in the concrete is sucked in, leaving an aggregate having a high specific gravity in the concrete, which promotes the separation of the concrete.

[0004] Accordingly, the present invention provides a vertical suction type concrete pump which can cope with concrete having a small slump value or concrete containing aggregate having a large maximum particle size and in which the concrete is hardly separated at the time of pumping. It is intended to be.

[0005]

A vertical suction type concrete pump according to claim 1 of the present application is provided with a hopper for temporarily storing concrete to be pumped, and a bottom wall of the hopper is provided with respect to each other. A pair of through-openings are formed at locations separated by a predetermined distance, and are fixed at locations where the through-openings are formed outside the bottom wall so as to extend away from the bottom wall, for pumping concrete. A pair of concrete cylinders, having an upper opening and a lower opening whose center line is located at a position substantially half the predetermined distance from the center line of the upper opening, wherein the upper opening communicates with the lower opening; A tube that is at least partially disposed in the hopper such that the center line of the upper opening is substantially centered between the pair of through openings. It is characterized in that the portion of the tube provided with the lower opening is rotated about the center line so that the lower opening can be alternately positioned just above the pair of through openings. Things.

A vertical suction type concrete pump according to claim 2 of the present application is characterized in that, in the pump according to claim 1, each of the concrete cylinders is fixed at right angles to a bottom wall of the hopper. It is assumed that.

The vertical suction type concrete pump according to claim 3 of the present invention is the pump according to claim 1, wherein each of the concrete cylinders forms an angle of 20 ° to 90 ° with respect to the bottom wall of the hopper. It is characterized by being fixed.

[0008]

Next, an embodiment of the present invention will be described in detail with reference to the drawings. A vertical suction concrete pump according to one embodiment of the present invention, generally designated 10 in FIGS. 1 and 4, includes a hopper 12 for temporarily containing concrete to be pumped. . The hopper 12 is illustrated as having the shape of an inverted truncated pyramid with an open top surface, but may have any other shape.

FIG. 2 is a schematic plan view of the vertical suction type concrete pumping pump 10.
2. The bearings 28 and 30 are omitted. Also, FIG.
FIG. 2 is a schematic plan view of the vertical suction type concrete pump 10, but in addition to a sprocket 32 and bearings 28 and 30, a tube 24 described later is omitted. Bottom wall 12 of hopper 12
a inside the plate 14, as best shown in FIG.
Are fixed by welding or the like. The plate 14 serves to prevent the bottom wall 12a from being worn, as will be described in detail later. The bottom wall 12a and the plate 14 are provided with a pair of openings 16 and 1 through the bottom wall 12a and the plate 14 at line-symmetrical locations separated by a distance d from the horizontal center line HH, respectively.
8 are formed.

FIG. 4 is a schematic sectional view of the vertical suction type concrete pump 10. As shown best in FIG. 4, the vertical suction concrete pump 10 is for pumping concrete so as to extend vertically downward to the location where the openings 16, 18 outside the bottom wall 12a are formed. A pair of concrete cylinders 20, 22 are fixed by welding or the like. The concrete cylinders 20 and 22 have pistons 20a and 22 respectively.
a are accommodated. Concrete cylinder 2
Numerals 0 and 22 are respectively connected to hydraulic cylinders (not shown), and each hydraulic cylinder is connected to a hydraulic source (not shown) via a hydraulic pipe (not shown).
In addition, a hydraulic switching valve (not shown) is interposed in the hydraulic piping in order to alternately extend and retract the pistons 20a and 22a. As a result, when the piston 20a is extended, the piston 22a is contracted, and when the piston 22a is extended,
0a is contracted. The above-described hydraulic mechanism including the concrete cylinders 20 and 22 may be a known one.

Also, as shown best in FIG. 4, the vertical suction type concrete pump 10 has an upper opening 24.
a and a lower opening 24b where the center line is located at a position separated by a distance d from the center line V-V of the upper opening 24a,
A tube 24 having an upper opening 24a and a lower opening 24b communicating with each other.
It has. The pipe 24 has a center line V- of the upper opening 24a.
V is at least partially disposed in the hopper 12 so as to be located substantially at the center between the opening 16 and the opening 18, and the portion provided with the lower opening 24 b is defined by a center line V-V. It is configured so that the lower opening 24b can be alternately positioned just above the openings 16 and 18 by rotating about the center.

More specifically, the tube 24 has a shaft 26 mounted on a center line V-V, and a lower end of the shaft 26 is connected to a first bearing 28 located at the bottom of the hopper 12. ing. Also, the upper opening 24 of the tube 24
At a location adjacent to a is mounted a second bearing 30 that is directly or indirectly connected to the hopper 12 or other structure. Further, a sprocket 32 connected to a driving mechanism (not shown) via a transmission means (not shown) such as a chain is attached to another portion adjacent to the upper opening 24a of the tube 24. . With the above configuration,
By actuating the drive mechanism to rotate the tube 24,
The lower opening 24b of the tube 24 can be positioned just above the opening 16 or the opening 18.

A transport pipe 25 is connected to the upper end of the pipe 24. The transport pipe 25 may be a conventional one.

FIG. 5 shows that the lower opening 24b of the tube 24 is the opening 1
It is the enlarged view which showed the state located just above 8. An anti-abrasion member 24c is fitted into a recess provided on the inner surface of the lower opening 24b, and a seal member 24d is mounted on the upper end of the anti-abrasion member 24c. Whenever the lower opening 24b of the tube 24 is positioned directly above the openings 16 and 18, the lower end of the tube 24 may come into contact with the bottom wall of the hopper 12, but the plate 14 is fixed to the bottom wall 12a of the hopper 12. The degree of wear is reduced by fitting the wear prevention member 24c to the lower end of the tube 24.

Next, the operation of the vertical suction type concrete pump 10 of the present invention will be described with reference to FIG. First, concrete is put into the hopper 12, and at the same time, the lower opening 24b of the pipe 24 is positioned immediately above the opening 18, and the piston 20a of the concrete cylinder 20 is contracted (see FIG. 6A). Then, the concrete is moved from the opening 16 to the concrete cylinder 2 by gravity.
Fall into 0. Next, as shown in FIG. 6B, the tube 24 is rotated to position the lower opening 24b immediately above the opening 16. In this state, the concrete cylinder 20 and the pipe 24 are in communication. Then, FIG.
As shown in (c), the concrete dropped into the concrete cylinder 20 is pumped by extending the piston 20a. At the same time, concrete cylinder 2
When the second piston 22a is contracted, the concrete becomes
Due to gravity, it falls from the opening 18 into the concrete cylinder 22. Next, as shown in FIG. 6D, the tube 24 is rotated to position the lower opening 24b immediately above the opening 18. Then, as shown in FIG. 6 (e), the piston 22a is extended and the concrete cylinder 22 is extended.
The concrete that falls into is pumped. The above operation is repeated to pump concrete.

The present invention is not limited to the above embodiments of the invention, and various modifications can be made within the scope of the invention described in the claims. It goes without saying that it is included in. For example, in the above embodiment, the concrete cylinders 20 and 22 are illustrated as being fixed at right angles to the bottom wall 12a of the hopper 12, but the concrete cylinders 20 and 22 and the bottom wall 12a of the hopper 12 are fixed. (See FIG. 4) may not be a right angle. According to experiments by the applicant, taking into account the fluidity of concrete, α
Is suitably in the range of 20 ° to 90 °.

[0017]

According to the present invention, the concrete falls into the concrete cylinder by the gravity of the concrete itself, so that even concrete containing hard concrete having a small slump value or aggregate having a large maximum particle size can be favorably used. Can be pumped. In addition, since the concrete is not sucked, the concrete is not separated and can be pumped while maintaining the quality of the concrete.

[Brief description of the drawings]

FIG. 1 is a partially cut-away schematic front view of a vertical suction type concrete pump according to one embodiment of the present invention.

FIG. 2 is a schematic plan view of the vertical suction type concrete pressure pump of FIG. 1, in which sprockets and bearings are omitted.

FIG. 3 is a schematic plan view of the vertical suction type concrete pump shown in FIG. 1, in which sprockets, bearings, and pipes are omitted.

FIG. 4 is a schematic sectional view of the vertical suction type concrete pump of FIG. 1;

FIG. 5 is an enlarged view showing a state where the lower opening of the pipe is positioned immediately above one opening of the bottom wall of the hopper.

FIG. 6 is a view showing the operation of the vertical suction type concrete pressure pump of FIG. 1;

FIG. 7 is a schematic view showing a conventional typical piston type concrete pump.

[Explanation of symbols]

 Reference Signs List 10 Vertical suction type concrete pump 12 hopper 16, 18 opening 20, 22 concrete cylinder 24 pipe

Claims (3)

[Claims] 1. A vertical suction type concrete pump, comprising a hopper for temporarily storing concrete to be pumped, and a pair of through holes at a bottom wall of the hopper at a predetermined distance from each other. An opening is formed, and is fixed at a position outside the bottom wall where the through-opening is formed so as to extend in a direction away from the bottom wall, respectively.
A pair of concrete cylinders for pumping concrete, comprising a top opening and a lower opening whose center line is located at a position substantially half the predetermined distance from the center line of the upper opening; An opening communicating with the lower opening, the tube being at least partially disposed within the hopper such that the center line of the upper opening is substantially centered between the pair of through openings. The tube is configured such that a portion of the tube provided with the lower opening is rotated about the center line, and the lower opening can be alternately positioned just above the pair of through openings. Concrete pumping pump characterized by the above-mentioned. 2. The concrete pump according to claim 1, wherein each of the concrete cylinders is fixed at right angles to a bottom wall of the hopper. 3. The concrete pump according to claim 1, wherein the concrete cylinders are each fixed at an angle of 20 ° to 90 ° with respect to the bottom wall of the hopper.