JPS6226282B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a flow rate adjustment method and an apparatus for implementing the method in descending fresh concrete transportation, and in particular,
When transporting ready-mixed concrete from above to the site below, the flow rate at which the ready-mixed concrete descends through the transport pipe is reduced and adjusted to prevent separation of the ready-mixed concrete and to prevent the separation of the ready-mixed concrete and the opening/closing devices and pipes installed in the pipes. For protection, the ready-mixed concrete is introduced into a control container provided at the tip of the transport pipe, where the ready-mixed concrete is retained by a resistance device that can be driven to allow appropriate flow of the ready-mixed concrete.
Transport while suppressing the flow of the following fresh concrete.

In conventional downward transportation of fresh concrete, for example, a snake chute or an air chamber method is used to suppress the downward flow velocity, but it is difficult to control the downward flow velocity of fresh concrete. Therefore, the conventional method still has problems with durability,
The scale of the device is large, making installation and handling inconvenient.

This invention solves the problems of the prior art, and its purpose is to adjustably reduce the descending flow rate of ready-mixed concrete during descending transportation. The purpose of this invention is to reliably protect concrete transport pipes and switchgear and improve their durability by reducing the descending flow velocity.Furthermore, the purpose of this invention is to prevent ready-mixed concrete from separating during descending transport. A further object of the present invention is to provide a means for adjusting the descending flow rate of fresh concrete that is simple in operation and structure, and a further object of the present invention is to make a device for regulating the descending flow rate of ready-mixed concrete compact.

That is, this application discloses a concrete transport pipe 1 extending in the vertical direction as in the illustrated embodiment.
When the ready-mixed concrete is transported downward, the pipe axis of the tip 2 of the concrete transport pipe 1 is set in the horizontal direction, and a resistance device 3 is built therein so that it can be driven in accordance with the flow direction of the ready-mixed concrete. A control vessel 4 is installed in series, and the resistance device 3 discharges the ready-mixed concrete from the outlet 5 of the control vessel 4 while retaining the ready-mixed concrete in the control vessel 4, thereby reducing the descending flow rate of the subsequent ready-mixed concrete. The specified invention is a method for adjusting the flow rate of fresh concrete to be controlled, and furthermore, the tip part 2 of the concrete transport pipe 1 which can be installed in the vertical direction is configured so that the axis of the pipe is substantially horizontal, and in this part, A control vessel 4 equipped with a resistance device 3 that can be driven in the direction of the flow of fresh concrete is connected at its inlet 6.
The discharge port 5 is provided vertically or horizontally shifted from the position of the inlet 6, and the resistance device 3 is connected to the drive device 7 for driving the device for adjusting the descending flow rate of fresh concrete. .

In this invention, a control vessel equipped with a resistance device that can be driven according to the direction of flow of concrete is connected to a concrete transport pipe that transports fresh concrete downward from above, and the fresh concrete is discharged while remaining there. By feeding, it supports the following fresh concrete and controls its flow rate.

As a result, the ready-mixed concrete descends seamlessly through the transport pipe at an appropriate flow rate. Therefore, the ready-mixed concrete can be supplied to the site without separation and maintaining good quality. In addition, the transport pipe and the opening/closing device provided thereon will not be destroyed by large abrasion caused by the rapid flow of fresh concrete, or by high pipe internal pressure or impact that occurs when fresh concrete is abruptly stopped.

Since the apparatus for carrying out this method simply retains fresh concrete in a control vessel equipped with a resistance device that can be driven in accordance with the direction of concrete flow, the structure is compact;
In addition, handling and structure are simplified.

Example 1 FIG. 1 shows an entire ready-mixed concrete transportation system to which the method and apparatus of the present invention are applied.

According to this, a concrete transport pipe 1 is vertically extended from an upper concrete supply position to a lower site (widely including a receiving position).
This invention is applied to the case where fresh concrete is transported downward from above, and therefore, the concrete transport pipe may extend diagonally in the vertical direction.

A hopper 8 is attached to the upper end of the concrete transport pipe 1. In addition, concrete transport pipe 1
An opening/closing device 9 is provided halfway down. As this opening/closing device, the one previously filed by the applicant in Japanese Patent Application No. 1974-74869 is used, but it is of course possible to use a conventionally known one. The lower end portion 2 of the concrete transport pipe 1 is bent so that the pipe axis is horizontal.

A pedestal 10 is provided below the lower end 2 of the concrete transport pipe 1, and a control container 4 is mounted and fixed on the pedestal 10.

This control vessel 4 has a resistance device 3 inside it and is provided with an inlet 6 at the bottom and an outlet 5 at the top. Reference numeral 7 in the figure denotes a drive device for driving the resistance device 3, and is adapted to drive the resistance device 3. Note that 11 in the figure is a transportation vehicle installed at the site.

As shown, the control vessel 4 is connected to the lower end of the concrete transport pipe 1 at its inlet 6. The internal structure of the control container 4 and its connections are clearly shown in FIGS. 2 and 3.

That is, as shown in the figure, the control container 4 has a cylindrical shape with a vertical inner peripheral surface. and,
A liner 12 is attached to the inner peripheral surface near the bottom. Further, a beam member 13 is diametrically extended over the upper end surface of the control container so as to pass through the center of the control container.

A bearing 7' is fixed in the center of the beam member 13, and this bearing 7' supports the shaft 14 so as to extend toward the bottom of the control vessel 4. In this embodiment, the shaft 14 is a so-called double shaft,
A screw conveyor 3a is fixed to the outer shaft, and a twisted stirring blade 3b is fixed to the lower end of the inner shaft.
These constitute a resistance device 3 within the control vessel. In addition, 15 in the figure is a clutch, and the shaft 14
It is constructed and fixed by a bracket 16 so as to be located at the upper end of the frame. The shaft 14 thus communicates with the clutch 15. By means of this clutch 15, the outer shaft and the inner shaft can be integrated with each other or become free, and can also be independently driven or switched. In the figure, 15' is a sprocket.

The drive device 7 is supported and fixed on a bracket 17 fixed above the outside of the control container 4.
Consists of VS motor. The sprocket 18 is connected to the sprocket 15' of the clutch 15 through a chain 19. Thus, the resistance device 3 can be selectively fixed and rotated within the control container 4. That is, by operating the clutch 15, only the screw conveyor 3a can be driven or can be made to work together. In particular, by driving the screw conveyor 3a at a desired speed, fresh concrete is discharged at a predetermined speed. By fixing the screw conveyor 3a or leaving it without applying any driving force, the ready-mixed concrete stays in the control container 4 and does not move, or is pushed by the following ready-mixed concrete little by little and spirals along the screw conveyor 3a. It is ejected while rotating. The distance between the outer periphery of the screw conveyor 3a and the inner peripheral surface of the control container 4 is set to an extent that does not exceed about twice the diameter of the aggregate of the ready-mixed concrete.
It was found that fresh concrete did not leak from between the outer circumference a and the inner circumference of the control vessel 4.

In the figure, 20 is a drain provided at the bottom of the control container 4, and 20' is its lid.

An inlet 6 opened near the bottom of the control vessel 4 is
In particular, as clearly shown in FIG. 3, the pipe axis at the lower end 2 of the concrete transport pipe 1 is opened along the tangential direction of the cylindrical control vessel 4. In this way, the fresh concrete sent from the concrete transport pipe 1 rotates and flows in the direction of the arrow in FIG. 3. With this, the stirring blade 3
b is rotated in the same direction, but since it scoops up the fresh concrete in the control vessel 4, it exhibits some resistance to rotation. Further, the stirring blade 3b performs an action of stirring the fresh concrete when the concrete stops falling due to its active rotation.

The outlet 5 is arranged offset above the inlet 6, ie at the upper edge of the control vessel 4. The position of this discharge port 5 at the upper edge of the control container is the fourth
It is clearly shown in the figure. As shown in Figure 4, the outlet 5
is provided so as to protrude on an extension of a diameter line passing through the center of the control container 4. Of course, its height is set slightly lower than the upper edge of the control container 4 (see FIG. 2).

In this way, the fresh concrete sent into the control vessel 4 by the concrete transport pipe 1 is discharged from the discharge port 5 while being retained by the resistance device 3. Due to this retention, the following fresh concrete descends in the concrete transport pipe 1 seamlessly and at a controlled speed.

Embodiment 2 FIGS. 5 and 6 show the case in which the method of the invention is carried out using a control vessel 4 and a resistance device 3 of a different type from those described above.

That is, the control container 4 has a cylindrical shape similar to that described above, but its height is smaller than that of the embodiment described above, and the upper end is also closed by the face plate 21. The face plate 21 has a motor 7a at its center.
, and has a shaft 14a extending into the control container 4. The lower end of the shaft 14a has a stirring blade 3b oriented in the vertical direction.

The inlet 6 and outlet 5 of this control container 4 are connected to the sixth
As shown in the figure, their axes are provided in a tangential direction with respect to the control vessel 4, but their positions on the circumferential surface of the control vessel are on the opposite side of the circumference across the diameter line of the control vessel 4. These are positions that extend parallel to the surface in the same direction. The discharge port 5 has a cylindrical shape, and a screw conveyor 3a is installed therein. As shown in FIG. 5, a drop port 5' is provided at the lower surface of the tip of the cylindrical discharge port 5, from which the ready-mixed concrete is finally discharged. Furthermore, a motor 7b for the screw conveyor 3a is provided at the tip of the cylindrical discharge port.

Thus, in this embodiment, the drive device 7 includes one for the screw conveyor 3a and one for the stirring blades 3.
It is divided into 7a and 7a for b.

The effects of this embodiment are also the same as those of the first embodiment, but in this case, the screw conveyor 3a constituting the resistance device 3 is provided outside the control container 4, and the stirring blades also constituting the resistance device 3 3b are provided in the control container 4 and each is adapted to be driven independently, so that a selection switching device such as a clutch is unnecessary. Further, the stirring blades 3b act so as to directly oppose the flow of fresh concrete (in the direction of the arrow in FIG. 6), and when driven, the screw conveyor 3a of the discharge port 5 is stirred while stirring the fresh concrete. It has the effect of sending it towards. Thus, as in Example 1, the fresh concrete remains in the control container 4 and the descending speed of the subsequent fresh concrete is controlled.

[Brief explanation of the drawing]

Fig. 1 is a front view showing the entire concrete transportation device implementing the method of the present invention, Fig. 2 is a longitudinal sectional view of the control vessel, Fig. 3 is a sectional view taken along the line 3-3 in Fig. 2, and Fig. 4. is a sectional view taken along the line 4-4 in FIG. 2, FIG. 5 is a vertical sectional view of a control container of another embodiment, and FIG.
-6 line sectional view. In the figure, 1 is a concrete transport pipe, 2 is its lower end, 3 is a resistance device, 3a is a screw conveyor,
3b is a stirring device, 4 is a control container, 5 is a discharge port, 6
is an inlet, 7 is a drive device, and 14 is a shaft.

Claims (1)

[Claims] 1. A concrete transport pipe extending in the vertical direction,
When transporting fresh concrete downward, the axis of the tip of the concrete transport pipe is set horizontally, and a control vessel with a built-in resistance device that can be driven in accordance with the flow direction of the fresh concrete is connected to this pipe. A method for adjusting the flow rate of fresh concrete, in which the resistance device allows the fresh concrete to remain in the control vessel while discharging the fresh concrete from the outlet of the control vessel, thereby controlling the descending flow rate of the subsequent fresh concrete. 2. The method for adjusting the flow rate of fresh concrete according to claim 1, in which the fresh concrete is retained in the control container by rotational flow within the control container. 3. The tip of a concrete transport pipe that can be extended in the vertical direction is configured so that the pipe axis is substantially horizontal, and a resistance device that can be driven in the direction of the flow of fresh concrete is installed in this part. A control device equipped with the control device is connected to the inlet thereof, an outlet of the control container is provided vertically or horizontally shifted from the position of the inlet, and the resistor device is connected to a drive device for driving the control container. A device that adjusts the concrete falling flow rate. 4. The control vessel has an inner peripheral surface shaped like a vertical cylinder, at least the concrete transport pipe is attached tangentially to the control vessel, and the resistance device includes a screw conveyor. A device for adjusting the flow rate according to claim 3. 5. The device for adjusting the flow rate according to claim 3, wherein the control device includes a screw conveyor and a stirring blade. 6. The control vessel has an inner peripheral surface shaped like a vertical cylinder, a concrete transport pipe is attached to the bottom of the control vessel from a tangential direction, and the discharge port is located at the bottom of the control vessel. The screw conveyor and the stirring blade are formed in the upper part, and the resistance device includes a screw conveyor and stirring blade supported by a double shaft set up in the center of the control vessel. 4. The device for adjusting the flow rate according to claim 3, wherein the devices can rotate integrally with each other, rotate independently, or can be separated from the drive device and become free. 7. The control vessel has an inner peripheral surface formed in the shape of a vertical cylinder, and a concrete transport pipe and a discharge port are attached from a tangential direction of the control vessel, and the discharge port is connected to the control vessel. Further, a resistance device is provided in the discharge port constituted by the stirring blade provided on a shaft erected at the center of the control container and the cylinder. 4. A device for adjusting the flow rate according to claim 3, comprising a screw conveyor. 8. The device for adjusting the flow rate according to claim 7, wherein the concrete transport pipe and the discharge port extend in the same direction from the circumferential surface on opposite sides of the control vessel via the diameter line.